ufshcd.c 144.0 KB
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/*
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 * Universal Flash Storage Host controller driver Core
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 *
 * This code is based on drivers/scsi/ufs/ufshcd.c
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 * Copyright (C) 2011-2013 Samsung India Software Operations
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 * Copyright (c) 2013-2014, The Linux Foundation. All rights reserved.
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 *
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 * Authors:
 *	Santosh Yaraganavi <santosh.sy@samsung.com>
 *	Vinayak Holikatti <h.vinayak@samsung.com>
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 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version 2
 * of the License, or (at your option) any later version.
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 * See the COPYING file in the top-level directory or visit
 * <http://www.gnu.org/licenses/gpl-2.0.html>
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 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
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 * This program is provided "AS IS" and "WITH ALL FAULTS" and
 * without warranty of any kind. You are solely responsible for
 * determining the appropriateness of using and distributing
 * the program and assume all risks associated with your exercise
 * of rights with respect to the program, including but not limited
 * to infringement of third party rights, the risks and costs of
 * program errors, damage to or loss of data, programs or equipment,
 * and unavailability or interruption of operations. Under no
 * circumstances will the contributor of this Program be liable for
 * any damages of any kind arising from your use or distribution of
 * this program.
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 *
 * The Linux Foundation chooses to take subject only to the GPLv2
 * license terms, and distributes only under these terms.
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 */

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#include <linux/async.h>
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#include <linux/devfreq.h>
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#include "ufshcd.h"
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#include "unipro.h"
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#define UFSHCD_ENABLE_INTRS	(UTP_TRANSFER_REQ_COMPL |\
				 UTP_TASK_REQ_COMPL |\
				 UFSHCD_ERROR_MASK)
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/* UIC command timeout, unit: ms */
#define UIC_CMD_TIMEOUT	500
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/* NOP OUT retries waiting for NOP IN response */
#define NOP_OUT_RETRIES    10
/* Timeout after 30 msecs if NOP OUT hangs without response */
#define NOP_OUT_TIMEOUT    30 /* msecs */

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/* Query request retries */
#define QUERY_REQ_RETRIES 10
/* Query request timeout */
#define QUERY_REQ_TIMEOUT 30 /* msec */

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/* Task management command timeout */
#define TM_CMD_TIMEOUT	100 /* msecs */

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/* maximum number of link-startup retries */
#define DME_LINKSTARTUP_RETRIES 3

/* maximum number of reset retries before giving up */
#define MAX_HOST_RESET_RETRIES 5

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/* Expose the flag value from utp_upiu_query.value */
#define MASK_QUERY_UPIU_FLAG_LOC 0xFF

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/* Interrupt aggregation default timeout, unit: 40us */
#define INT_AGGR_DEF_TO	0x02

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#define ufshcd_toggle_vreg(_dev, _vreg, _on)				\
	({                                                              \
		int _ret;                                               \
		if (_on)                                                \
			_ret = ufshcd_enable_vreg(_dev, _vreg);         \
		else                                                    \
			_ret = ufshcd_disable_vreg(_dev, _vreg);        \
		_ret;                                                   \
	})

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static u32 ufs_query_desc_max_size[] = {
	QUERY_DESC_DEVICE_MAX_SIZE,
	QUERY_DESC_CONFIGURAION_MAX_SIZE,
	QUERY_DESC_UNIT_MAX_SIZE,
	QUERY_DESC_RFU_MAX_SIZE,
	QUERY_DESC_INTERCONNECT_MAX_SIZE,
	QUERY_DESC_STRING_MAX_SIZE,
	QUERY_DESC_RFU_MAX_SIZE,
	QUERY_DESC_GEOMETRY_MAZ_SIZE,
	QUERY_DESC_POWER_MAX_SIZE,
	QUERY_DESC_RFU_MAX_SIZE,
};

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enum {
	UFSHCD_MAX_CHANNEL	= 0,
	UFSHCD_MAX_ID		= 1,
	UFSHCD_CMD_PER_LUN	= 32,
	UFSHCD_CAN_QUEUE	= 32,
};

/* UFSHCD states */
enum {
	UFSHCD_STATE_RESET,
	UFSHCD_STATE_ERROR,
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	UFSHCD_STATE_OPERATIONAL,
};

/* UFSHCD error handling flags */
enum {
	UFSHCD_EH_IN_PROGRESS = (1 << 0),
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};

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/* UFSHCD UIC layer error flags */
enum {
	UFSHCD_UIC_DL_PA_INIT_ERROR = (1 << 0), /* Data link layer error */
	UFSHCD_UIC_NL_ERROR = (1 << 1), /* Network layer error */
	UFSHCD_UIC_TL_ERROR = (1 << 2), /* Transport Layer error */
	UFSHCD_UIC_DME_ERROR = (1 << 3), /* DME error */
};

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/* Interrupt configuration options */
enum {
	UFSHCD_INT_DISABLE,
	UFSHCD_INT_ENABLE,
	UFSHCD_INT_CLEAR,
};

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#define ufshcd_set_eh_in_progress(h) \
	(h->eh_flags |= UFSHCD_EH_IN_PROGRESS)
#define ufshcd_eh_in_progress(h) \
	(h->eh_flags & UFSHCD_EH_IN_PROGRESS)
#define ufshcd_clear_eh_in_progress(h) \
	(h->eh_flags &= ~UFSHCD_EH_IN_PROGRESS)

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#define ufshcd_set_ufs_dev_active(h) \
	((h)->curr_dev_pwr_mode = UFS_ACTIVE_PWR_MODE)
#define ufshcd_set_ufs_dev_sleep(h) \
	((h)->curr_dev_pwr_mode = UFS_SLEEP_PWR_MODE)
#define ufshcd_set_ufs_dev_poweroff(h) \
	((h)->curr_dev_pwr_mode = UFS_POWERDOWN_PWR_MODE)
#define ufshcd_is_ufs_dev_active(h) \
	((h)->curr_dev_pwr_mode == UFS_ACTIVE_PWR_MODE)
#define ufshcd_is_ufs_dev_sleep(h) \
	((h)->curr_dev_pwr_mode == UFS_SLEEP_PWR_MODE)
#define ufshcd_is_ufs_dev_poweroff(h) \
	((h)->curr_dev_pwr_mode == UFS_POWERDOWN_PWR_MODE)

static struct ufs_pm_lvl_states ufs_pm_lvl_states[] = {
	{UFS_ACTIVE_PWR_MODE, UIC_LINK_ACTIVE_STATE},
	{UFS_ACTIVE_PWR_MODE, UIC_LINK_HIBERN8_STATE},
	{UFS_SLEEP_PWR_MODE, UIC_LINK_ACTIVE_STATE},
	{UFS_SLEEP_PWR_MODE, UIC_LINK_HIBERN8_STATE},
	{UFS_POWERDOWN_PWR_MODE, UIC_LINK_HIBERN8_STATE},
	{UFS_POWERDOWN_PWR_MODE, UIC_LINK_OFF_STATE},
};

static inline enum ufs_dev_pwr_mode
ufs_get_pm_lvl_to_dev_pwr_mode(enum ufs_pm_level lvl)
{
	return ufs_pm_lvl_states[lvl].dev_state;
}

static inline enum uic_link_state
ufs_get_pm_lvl_to_link_pwr_state(enum ufs_pm_level lvl)
{
	return ufs_pm_lvl_states[lvl].link_state;
}

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static void ufshcd_tmc_handler(struct ufs_hba *hba);
static void ufshcd_async_scan(void *data, async_cookie_t cookie);
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static int ufshcd_reset_and_restore(struct ufs_hba *hba);
static int ufshcd_clear_tm_cmd(struct ufs_hba *hba, int tag);
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static void ufshcd_hba_exit(struct ufs_hba *hba);
static int ufshcd_probe_hba(struct ufs_hba *hba);
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static int __ufshcd_setup_clocks(struct ufs_hba *hba, bool on,
				 bool skip_ref_clk);
static int ufshcd_setup_clocks(struct ufs_hba *hba, bool on);
static int ufshcd_uic_hibern8_exit(struct ufs_hba *hba);
static int ufshcd_uic_hibern8_enter(struct ufs_hba *hba);
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static int ufshcd_host_reset_and_restore(struct ufs_hba *hba);
static irqreturn_t ufshcd_intr(int irq, void *__hba);
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static int ufshcd_config_pwr_mode(struct ufs_hba *hba,
		struct ufs_pa_layer_attr *desired_pwr_mode);
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static inline int ufshcd_enable_irq(struct ufs_hba *hba)
{
	int ret = 0;

	if (!hba->is_irq_enabled) {
		ret = request_irq(hba->irq, ufshcd_intr, IRQF_SHARED, UFSHCD,
				hba);
		if (ret)
			dev_err(hba->dev, "%s: request_irq failed, ret=%d\n",
				__func__, ret);
		hba->is_irq_enabled = true;
	}

	return ret;
}

static inline void ufshcd_disable_irq(struct ufs_hba *hba)
{
	if (hba->is_irq_enabled) {
		free_irq(hba->irq, hba);
		hba->is_irq_enabled = false;
	}
}
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/*
 * ufshcd_wait_for_register - wait for register value to change
 * @hba - per-adapter interface
 * @reg - mmio register offset
 * @mask - mask to apply to read register value
 * @val - wait condition
 * @interval_us - polling interval in microsecs
 * @timeout_ms - timeout in millisecs
 *
 * Returns -ETIMEDOUT on error, zero on success
 */
static int ufshcd_wait_for_register(struct ufs_hba *hba, u32 reg, u32 mask,
		u32 val, unsigned long interval_us, unsigned long timeout_ms)
{
	int err = 0;
	unsigned long timeout = jiffies + msecs_to_jiffies(timeout_ms);

	/* ignore bits that we don't intend to wait on */
	val = val & mask;

	while ((ufshcd_readl(hba, reg) & mask) != val) {
		/* wakeup within 50us of expiry */
		usleep_range(interval_us, interval_us + 50);

		if (time_after(jiffies, timeout)) {
			if ((ufshcd_readl(hba, reg) & mask) != val)
				err = -ETIMEDOUT;
			break;
		}
	}

	return err;
}

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/**
 * ufshcd_get_intr_mask - Get the interrupt bit mask
 * @hba - Pointer to adapter instance
 *
 * Returns interrupt bit mask per version
 */
static inline u32 ufshcd_get_intr_mask(struct ufs_hba *hba)
{
	if (hba->ufs_version == UFSHCI_VERSION_10)
		return INTERRUPT_MASK_ALL_VER_10;
	else
		return INTERRUPT_MASK_ALL_VER_11;
}

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/**
 * ufshcd_get_ufs_version - Get the UFS version supported by the HBA
 * @hba - Pointer to adapter instance
 *
 * Returns UFSHCI version supported by the controller
 */
static inline u32 ufshcd_get_ufs_version(struct ufs_hba *hba)
{
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	return ufshcd_readl(hba, REG_UFS_VERSION);
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}

/**
 * ufshcd_is_device_present - Check if any device connected to
 *			      the host controller
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 * @hba: pointer to adapter instance
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 *
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 * Returns 1 if device present, 0 if no device detected
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 */
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static inline int ufshcd_is_device_present(struct ufs_hba *hba)
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{
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	return (ufshcd_readl(hba, REG_CONTROLLER_STATUS) &
						DEVICE_PRESENT) ? 1 : 0;
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}

/**
 * ufshcd_get_tr_ocs - Get the UTRD Overall Command Status
 * @lrb: pointer to local command reference block
 *
 * This function is used to get the OCS field from UTRD
 * Returns the OCS field in the UTRD
 */
static inline int ufshcd_get_tr_ocs(struct ufshcd_lrb *lrbp)
{
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	return le32_to_cpu(lrbp->utr_descriptor_ptr->header.dword_2) & MASK_OCS;
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}

/**
 * ufshcd_get_tmr_ocs - Get the UTMRD Overall Command Status
 * @task_req_descp: pointer to utp_task_req_desc structure
 *
 * This function is used to get the OCS field from UTMRD
 * Returns the OCS field in the UTMRD
 */
static inline int
ufshcd_get_tmr_ocs(struct utp_task_req_desc *task_req_descp)
{
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	return le32_to_cpu(task_req_descp->header.dword_2) & MASK_OCS;
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}

/**
 * ufshcd_get_tm_free_slot - get a free slot for task management request
 * @hba: per adapter instance
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 * @free_slot: pointer to variable with available slot value
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 *
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 * Get a free tag and lock it until ufshcd_put_tm_slot() is called.
 * Returns 0 if free slot is not available, else return 1 with tag value
 * in @free_slot.
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 */
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static bool ufshcd_get_tm_free_slot(struct ufs_hba *hba, int *free_slot)
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{
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	int tag;
	bool ret = false;

	if (!free_slot)
		goto out;

	do {
		tag = find_first_zero_bit(&hba->tm_slots_in_use, hba->nutmrs);
		if (tag >= hba->nutmrs)
			goto out;
	} while (test_and_set_bit_lock(tag, &hba->tm_slots_in_use));

	*free_slot = tag;
	ret = true;
out:
	return ret;
}

static inline void ufshcd_put_tm_slot(struct ufs_hba *hba, int slot)
{
	clear_bit_unlock(slot, &hba->tm_slots_in_use);
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}

/**
 * ufshcd_utrl_clear - Clear a bit in UTRLCLR register
 * @hba: per adapter instance
 * @pos: position of the bit to be cleared
 */
static inline void ufshcd_utrl_clear(struct ufs_hba *hba, u32 pos)
{
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	ufshcd_writel(hba, ~(1 << pos), REG_UTP_TRANSFER_REQ_LIST_CLEAR);
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}

/**
 * ufshcd_get_lists_status - Check UCRDY, UTRLRDY and UTMRLRDY
 * @reg: Register value of host controller status
 *
 * Returns integer, 0 on Success and positive value if failed
 */
static inline int ufshcd_get_lists_status(u32 reg)
{
	/*
	 * The mask 0xFF is for the following HCS register bits
	 * Bit		Description
	 *  0		Device Present
	 *  1		UTRLRDY
	 *  2		UTMRLRDY
	 *  3		UCRDY
	 *  4		HEI
	 *  5		DEI
	 * 6-7		reserved
	 */
	return (((reg) & (0xFF)) >> 1) ^ (0x07);
}

/**
 * ufshcd_get_uic_cmd_result - Get the UIC command result
 * @hba: Pointer to adapter instance
 *
 * This function gets the result of UIC command completion
 * Returns 0 on success, non zero value on error
 */
static inline int ufshcd_get_uic_cmd_result(struct ufs_hba *hba)
{
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	return ufshcd_readl(hba, REG_UIC_COMMAND_ARG_2) &
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	       MASK_UIC_COMMAND_RESULT;
}

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/**
 * ufshcd_get_dme_attr_val - Get the value of attribute returned by UIC command
 * @hba: Pointer to adapter instance
 *
 * This function gets UIC command argument3
 * Returns 0 on success, non zero value on error
 */
static inline u32 ufshcd_get_dme_attr_val(struct ufs_hba *hba)
{
	return ufshcd_readl(hba, REG_UIC_COMMAND_ARG_3);
}

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/**
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 * ufshcd_get_req_rsp - returns the TR response transaction type
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 * @ucd_rsp_ptr: pointer to response UPIU
 */
static inline int
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ufshcd_get_req_rsp(struct utp_upiu_rsp *ucd_rsp_ptr)
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{
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	return be32_to_cpu(ucd_rsp_ptr->header.dword_0) >> 24;
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}

/**
 * ufshcd_get_rsp_upiu_result - Get the result from response UPIU
 * @ucd_rsp_ptr: pointer to response UPIU
 *
 * This function gets the response status and scsi_status from response UPIU
 * Returns the response result code.
 */
static inline int
ufshcd_get_rsp_upiu_result(struct utp_upiu_rsp *ucd_rsp_ptr)
{
	return be32_to_cpu(ucd_rsp_ptr->header.dword_1) & MASK_RSP_UPIU_RESULT;
}

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/*
 * ufshcd_get_rsp_upiu_data_seg_len - Get the data segment length
 *				from response UPIU
 * @ucd_rsp_ptr: pointer to response UPIU
 *
 * Return the data segment length.
 */
static inline unsigned int
ufshcd_get_rsp_upiu_data_seg_len(struct utp_upiu_rsp *ucd_rsp_ptr)
{
	return be32_to_cpu(ucd_rsp_ptr->header.dword_2) &
		MASK_RSP_UPIU_DATA_SEG_LEN;
}

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/**
 * ufshcd_is_exception_event - Check if the device raised an exception event
 * @ucd_rsp_ptr: pointer to response UPIU
 *
 * The function checks if the device raised an exception event indicated in
 * the Device Information field of response UPIU.
 *
 * Returns true if exception is raised, false otherwise.
 */
static inline bool ufshcd_is_exception_event(struct utp_upiu_rsp *ucd_rsp_ptr)
{
	return be32_to_cpu(ucd_rsp_ptr->header.dword_2) &
			MASK_RSP_EXCEPTION_EVENT ? true : false;
}

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/**
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 * ufshcd_reset_intr_aggr - Reset interrupt aggregation values.
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 * @hba: per adapter instance
 */
static inline void
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ufshcd_reset_intr_aggr(struct ufs_hba *hba)
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{
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	ufshcd_writel(hba, INT_AGGR_ENABLE |
		      INT_AGGR_COUNTER_AND_TIMER_RESET,
		      REG_UTP_TRANSFER_REQ_INT_AGG_CONTROL);
}

/**
 * ufshcd_config_intr_aggr - Configure interrupt aggregation values.
 * @hba: per adapter instance
 * @cnt: Interrupt aggregation counter threshold
 * @tmout: Interrupt aggregation timeout value
 */
static inline void
ufshcd_config_intr_aggr(struct ufs_hba *hba, u8 cnt, u8 tmout)
{
	ufshcd_writel(hba, INT_AGGR_ENABLE | INT_AGGR_PARAM_WRITE |
		      INT_AGGR_COUNTER_THLD_VAL(cnt) |
		      INT_AGGR_TIMEOUT_VAL(tmout),
		      REG_UTP_TRANSFER_REQ_INT_AGG_CONTROL);
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}

/**
 * ufshcd_enable_run_stop_reg - Enable run-stop registers,
 *			When run-stop registers are set to 1, it indicates the
 *			host controller that it can process the requests
 * @hba: per adapter instance
 */
static void ufshcd_enable_run_stop_reg(struct ufs_hba *hba)
{
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	ufshcd_writel(hba, UTP_TASK_REQ_LIST_RUN_STOP_BIT,
		      REG_UTP_TASK_REQ_LIST_RUN_STOP);
	ufshcd_writel(hba, UTP_TRANSFER_REQ_LIST_RUN_STOP_BIT,
		      REG_UTP_TRANSFER_REQ_LIST_RUN_STOP);
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}

/**
 * ufshcd_hba_start - Start controller initialization sequence
 * @hba: per adapter instance
 */
static inline void ufshcd_hba_start(struct ufs_hba *hba)
{
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	ufshcd_writel(hba, CONTROLLER_ENABLE, REG_CONTROLLER_ENABLE);
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}

/**
 * ufshcd_is_hba_active - Get controller state
 * @hba: per adapter instance
 *
 * Returns zero if controller is active, 1 otherwise
 */
static inline int ufshcd_is_hba_active(struct ufs_hba *hba)
{
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	return (ufshcd_readl(hba, REG_CONTROLLER_ENABLE) & 0x1) ? 0 : 1;
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}

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static void ufshcd_ungate_work(struct work_struct *work)
{
	int ret;
	unsigned long flags;
	struct ufs_hba *hba = container_of(work, struct ufs_hba,
			clk_gating.ungate_work);

	cancel_delayed_work_sync(&hba->clk_gating.gate_work);

	spin_lock_irqsave(hba->host->host_lock, flags);
	if (hba->clk_gating.state == CLKS_ON) {
		spin_unlock_irqrestore(hba->host->host_lock, flags);
		goto unblock_reqs;
	}

	spin_unlock_irqrestore(hba->host->host_lock, flags);
	ufshcd_setup_clocks(hba, true);

	/* Exit from hibern8 */
	if (ufshcd_can_hibern8_during_gating(hba)) {
		/* Prevent gating in this path */
		hba->clk_gating.is_suspended = true;
		if (ufshcd_is_link_hibern8(hba)) {
			ret = ufshcd_uic_hibern8_exit(hba);
			if (ret)
				dev_err(hba->dev, "%s: hibern8 exit failed %d\n",
					__func__, ret);
			else
				ufshcd_set_link_active(hba);
		}
		hba->clk_gating.is_suspended = false;
	}
unblock_reqs:
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	if (ufshcd_is_clkscaling_enabled(hba))
		devfreq_resume_device(hba->devfreq);
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	scsi_unblock_requests(hba->host);
}

/**
 * ufshcd_hold - Enable clocks that were gated earlier due to ufshcd_release.
 * Also, exit from hibern8 mode and set the link as active.
 * @hba: per adapter instance
 * @async: This indicates whether caller should ungate clocks asynchronously.
 */
int ufshcd_hold(struct ufs_hba *hba, bool async)
{
	int rc = 0;
	unsigned long flags;

	if (!ufshcd_is_clkgating_allowed(hba))
		goto out;
	spin_lock_irqsave(hba->host->host_lock, flags);
	hba->clk_gating.active_reqs++;

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start:
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	switch (hba->clk_gating.state) {
	case CLKS_ON:
		break;
	case REQ_CLKS_OFF:
		if (cancel_delayed_work(&hba->clk_gating.gate_work)) {
			hba->clk_gating.state = CLKS_ON;
			break;
		}
		/*
		 * If we here, it means gating work is either done or
		 * currently running. Hence, fall through to cancel gating
		 * work and to enable clocks.
		 */
	case CLKS_OFF:
		scsi_block_requests(hba->host);
		hba->clk_gating.state = REQ_CLKS_ON;
		schedule_work(&hba->clk_gating.ungate_work);
		/*
		 * fall through to check if we should wait for this
		 * work to be done or not.
		 */
	case REQ_CLKS_ON:
		if (async) {
			rc = -EAGAIN;
			hba->clk_gating.active_reqs--;
			break;
		}

		spin_unlock_irqrestore(hba->host->host_lock, flags);
		flush_work(&hba->clk_gating.ungate_work);
		/* Make sure state is CLKS_ON before returning */
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		spin_lock_irqsave(hba->host->host_lock, flags);
603 604 605 606 607 608 609 610 611 612 613 614 615 616 617 618 619 620 621 622 623 624 625 626 627 628 629 630 631 632 633 634 635 636 637 638 639 640 641 642
		goto start;
	default:
		dev_err(hba->dev, "%s: clk gating is in invalid state %d\n",
				__func__, hba->clk_gating.state);
		break;
	}
	spin_unlock_irqrestore(hba->host->host_lock, flags);
out:
	return rc;
}

static void ufshcd_gate_work(struct work_struct *work)
{
	struct ufs_hba *hba = container_of(work, struct ufs_hba,
			clk_gating.gate_work.work);
	unsigned long flags;

	spin_lock_irqsave(hba->host->host_lock, flags);
	if (hba->clk_gating.is_suspended) {
		hba->clk_gating.state = CLKS_ON;
		goto rel_lock;
	}

	if (hba->clk_gating.active_reqs
		|| hba->ufshcd_state != UFSHCD_STATE_OPERATIONAL
		|| hba->lrb_in_use || hba->outstanding_tasks
		|| hba->active_uic_cmd || hba->uic_async_done)
		goto rel_lock;

	spin_unlock_irqrestore(hba->host->host_lock, flags);

	/* put the link into hibern8 mode before turning off clocks */
	if (ufshcd_can_hibern8_during_gating(hba)) {
		if (ufshcd_uic_hibern8_enter(hba)) {
			hba->clk_gating.state = CLKS_ON;
			goto out;
		}
		ufshcd_set_link_hibern8(hba);
	}

643 644 645 646 647
	if (ufshcd_is_clkscaling_enabled(hba)) {
		devfreq_suspend_device(hba->devfreq);
		hba->clk_scaling.window_start_t = 0;
	}

648 649 650 651 652 653 654 655 656 657 658 659 660 661 662 663 664 665 666 667 668 669 670 671 672 673 674 675 676 677 678 679 680 681 682 683 684 685 686 687 688 689 690 691 692 693 694 695 696 697 698 699 700 701 702 703 704 705 706 707 708 709 710 711 712 713 714 715 716 717 718 719 720 721 722 723 724 725 726 727 728 729 730 731 732 733 734 735 736 737 738 739 740 741 742 743 744 745 746
	if (!ufshcd_is_link_active(hba))
		ufshcd_setup_clocks(hba, false);
	else
		/* If link is active, device ref_clk can't be switched off */
		__ufshcd_setup_clocks(hba, false, true);

	/*
	 * In case you are here to cancel this work the gating state
	 * would be marked as REQ_CLKS_ON. In this case keep the state
	 * as REQ_CLKS_ON which would anyway imply that clocks are off
	 * and a request to turn them on is pending. By doing this way,
	 * we keep the state machine in tact and this would ultimately
	 * prevent from doing cancel work multiple times when there are
	 * new requests arriving before the current cancel work is done.
	 */
	spin_lock_irqsave(hba->host->host_lock, flags);
	if (hba->clk_gating.state == REQ_CLKS_OFF)
		hba->clk_gating.state = CLKS_OFF;

rel_lock:
	spin_unlock_irqrestore(hba->host->host_lock, flags);
out:
	return;
}

/* host lock must be held before calling this variant */
static void __ufshcd_release(struct ufs_hba *hba)
{
	if (!ufshcd_is_clkgating_allowed(hba))
		return;

	hba->clk_gating.active_reqs--;

	if (hba->clk_gating.active_reqs || hba->clk_gating.is_suspended
		|| hba->ufshcd_state != UFSHCD_STATE_OPERATIONAL
		|| hba->lrb_in_use || hba->outstanding_tasks
		|| hba->active_uic_cmd || hba->uic_async_done)
		return;

	hba->clk_gating.state = REQ_CLKS_OFF;
	schedule_delayed_work(&hba->clk_gating.gate_work,
			msecs_to_jiffies(hba->clk_gating.delay_ms));
}

void ufshcd_release(struct ufs_hba *hba)
{
	unsigned long flags;

	spin_lock_irqsave(hba->host->host_lock, flags);
	__ufshcd_release(hba);
	spin_unlock_irqrestore(hba->host->host_lock, flags);
}

static ssize_t ufshcd_clkgate_delay_show(struct device *dev,
		struct device_attribute *attr, char *buf)
{
	struct ufs_hba *hba = dev_get_drvdata(dev);

	return snprintf(buf, PAGE_SIZE, "%lu\n", hba->clk_gating.delay_ms);
}

static ssize_t ufshcd_clkgate_delay_store(struct device *dev,
		struct device_attribute *attr, const char *buf, size_t count)
{
	struct ufs_hba *hba = dev_get_drvdata(dev);
	unsigned long flags, value;

	if (kstrtoul(buf, 0, &value))
		return -EINVAL;

	spin_lock_irqsave(hba->host->host_lock, flags);
	hba->clk_gating.delay_ms = value;
	spin_unlock_irqrestore(hba->host->host_lock, flags);
	return count;
}

static void ufshcd_init_clk_gating(struct ufs_hba *hba)
{
	if (!ufshcd_is_clkgating_allowed(hba))
		return;

	hba->clk_gating.delay_ms = 150;
	INIT_DELAYED_WORK(&hba->clk_gating.gate_work, ufshcd_gate_work);
	INIT_WORK(&hba->clk_gating.ungate_work, ufshcd_ungate_work);

	hba->clk_gating.delay_attr.show = ufshcd_clkgate_delay_show;
	hba->clk_gating.delay_attr.store = ufshcd_clkgate_delay_store;
	sysfs_attr_init(&hba->clk_gating.delay_attr.attr);
	hba->clk_gating.delay_attr.attr.name = "clkgate_delay_ms";
	hba->clk_gating.delay_attr.attr.mode = S_IRUGO | S_IWUSR;
	if (device_create_file(hba->dev, &hba->clk_gating.delay_attr))
		dev_err(hba->dev, "Failed to create sysfs for clkgate_delay\n");
}

static void ufshcd_exit_clk_gating(struct ufs_hba *hba)
{
	if (!ufshcd_is_clkgating_allowed(hba))
		return;
	device_remove_file(hba->dev, &hba->clk_gating.delay_attr);
747 748
	cancel_work_sync(&hba->clk_gating.ungate_work);
	cancel_delayed_work_sync(&hba->clk_gating.gate_work);
749 750
}

751 752 753 754 755 756 757 758 759 760 761 762 763 764 765 766 767 768 769 770 771 772 773 774 775 776
/* Must be called with host lock acquired */
static void ufshcd_clk_scaling_start_busy(struct ufs_hba *hba)
{
	if (!ufshcd_is_clkscaling_enabled(hba))
		return;

	if (!hba->clk_scaling.is_busy_started) {
		hba->clk_scaling.busy_start_t = ktime_get();
		hba->clk_scaling.is_busy_started = true;
	}
}

static void ufshcd_clk_scaling_update_busy(struct ufs_hba *hba)
{
	struct ufs_clk_scaling *scaling = &hba->clk_scaling;

	if (!ufshcd_is_clkscaling_enabled(hba))
		return;

	if (!hba->outstanding_reqs && scaling->is_busy_started) {
		scaling->tot_busy_t += ktime_to_us(ktime_sub(ktime_get(),
					scaling->busy_start_t));
		scaling->busy_start_t = ktime_set(0, 0);
		scaling->is_busy_started = false;
	}
}
777 778 779 780 781 782 783 784
/**
 * ufshcd_send_command - Send SCSI or device management commands
 * @hba: per adapter instance
 * @task_tag: Task tag of the command
 */
static inline
void ufshcd_send_command(struct ufs_hba *hba, unsigned int task_tag)
{
785
	ufshcd_clk_scaling_start_busy(hba);
786
	__set_bit(task_tag, &hba->outstanding_reqs);
787
	ufshcd_writel(hba, 1 << task_tag, REG_UTP_TRANSFER_REQ_DOOR_BELL);
788 789 790 791 792 793 794 795 796
}

/**
 * ufshcd_copy_sense_data - Copy sense data in case of check condition
 * @lrb - pointer to local reference block
 */
static inline void ufshcd_copy_sense_data(struct ufshcd_lrb *lrbp)
{
	int len;
797 798
	if (lrbp->sense_buffer &&
	    ufshcd_get_rsp_upiu_data_seg_len(lrbp->ucd_rsp_ptr)) {
799
		len = be16_to_cpu(lrbp->ucd_rsp_ptr->sr.sense_data_len);
800
		memcpy(lrbp->sense_buffer,
801
			lrbp->ucd_rsp_ptr->sr.sense_data,
802 803 804 805
			min_t(int, len, SCSI_SENSE_BUFFERSIZE));
	}
}

806 807 808 809 810 811 812
/**
 * ufshcd_copy_query_response() - Copy the Query Response and the data
 * descriptor
 * @hba: per adapter instance
 * @lrb - pointer to local reference block
 */
static
813
int ufshcd_copy_query_response(struct ufs_hba *hba, struct ufshcd_lrb *lrbp)
814 815 816 817 818 819 820
{
	struct ufs_query_res *query_res = &hba->dev_cmd.query.response;

	memcpy(&query_res->upiu_res, &lrbp->ucd_rsp_ptr->qr, QUERY_OSF_SIZE);

	/* Get the descriptor */
	if (lrbp->ucd_rsp_ptr->qr.opcode == UPIU_QUERY_OPCODE_READ_DESC) {
D
Dolev Raviv 已提交
821
		u8 *descp = (u8 *)lrbp->ucd_rsp_ptr +
822
				GENERAL_UPIU_REQUEST_SIZE;
823 824
		u16 resp_len;
		u16 buf_len;
825 826

		/* data segment length */
827
		resp_len = be32_to_cpu(lrbp->ucd_rsp_ptr->header.dword_2) &
828
						MASK_QUERY_DATA_SEG_LEN;
829 830
		buf_len = be16_to_cpu(
				hba->dev_cmd.query.request.upiu_req.length);
831 832 833 834 835 836 837 838
		if (likely(buf_len >= resp_len)) {
			memcpy(hba->dev_cmd.query.descriptor, descp, resp_len);
		} else {
			dev_warn(hba->dev,
				"%s: Response size is bigger than buffer",
				__func__);
			return -EINVAL;
		}
839
	}
840 841

	return 0;
842 843
}

844 845 846 847 848 849
/**
 * ufshcd_hba_capabilities - Read controller capabilities
 * @hba: per adapter instance
 */
static inline void ufshcd_hba_capabilities(struct ufs_hba *hba)
{
850
	hba->capabilities = ufshcd_readl(hba, REG_CONTROLLER_CAPABILITIES);
851 852 853 854 855 856 857 858

	/* nutrs and nutmrs are 0 based values */
	hba->nutrs = (hba->capabilities & MASK_TRANSFER_REQUESTS_SLOTS) + 1;
	hba->nutmrs =
	((hba->capabilities & MASK_TASK_MANAGEMENT_REQUEST_SLOTS) >> 16) + 1;
}

/**
859 860
 * ufshcd_ready_for_uic_cmd - Check if controller is ready
 *                            to accept UIC commands
861
 * @hba: per adapter instance
862 863 864 865 866 867 868 869 870 871
 * Return true on success, else false
 */
static inline bool ufshcd_ready_for_uic_cmd(struct ufs_hba *hba)
{
	if (ufshcd_readl(hba, REG_CONTROLLER_STATUS) & UIC_COMMAND_READY)
		return true;
	else
		return false;
}

872 873 874 875 876 877 878 879 880 881 882 883
/**
 * ufshcd_get_upmcrs - Get the power mode change request status
 * @hba: Pointer to adapter instance
 *
 * This function gets the UPMCRS field of HCS register
 * Returns value of UPMCRS field
 */
static inline u8 ufshcd_get_upmcrs(struct ufs_hba *hba)
{
	return (ufshcd_readl(hba, REG_CONTROLLER_STATUS) >> 8) & 0x7;
}

884 885 886 887 888 889
/**
 * ufshcd_dispatch_uic_cmd - Dispatch UIC commands to unipro layers
 * @hba: per adapter instance
 * @uic_cmd: UIC command
 *
 * Mutex must be held.
890 891
 */
static inline void
892
ufshcd_dispatch_uic_cmd(struct ufs_hba *hba, struct uic_command *uic_cmd)
893
{
894 895 896 897
	WARN_ON(hba->active_uic_cmd);

	hba->active_uic_cmd = uic_cmd;

898
	/* Write Args */
899 900 901
	ufshcd_writel(hba, uic_cmd->argument1, REG_UIC_COMMAND_ARG_1);
	ufshcd_writel(hba, uic_cmd->argument2, REG_UIC_COMMAND_ARG_2);
	ufshcd_writel(hba, uic_cmd->argument3, REG_UIC_COMMAND_ARG_3);
902 903

	/* Write UIC Cmd */
904
	ufshcd_writel(hba, uic_cmd->command & COMMAND_OPCODE_MASK,
905
		      REG_UIC_COMMAND);
906 907
}

908 909 910 911 912 913 914 915 916 917 918 919 920 921 922 923 924 925 926 927 928 929 930 931 932 933 934 935 936 937 938 939 940
/**
 * ufshcd_wait_for_uic_cmd - Wait complectioin of UIC command
 * @hba: per adapter instance
 * @uic_command: UIC command
 *
 * Must be called with mutex held.
 * Returns 0 only if success.
 */
static int
ufshcd_wait_for_uic_cmd(struct ufs_hba *hba, struct uic_command *uic_cmd)
{
	int ret;
	unsigned long flags;

	if (wait_for_completion_timeout(&uic_cmd->done,
					msecs_to_jiffies(UIC_CMD_TIMEOUT)))
		ret = uic_cmd->argument2 & MASK_UIC_COMMAND_RESULT;
	else
		ret = -ETIMEDOUT;

	spin_lock_irqsave(hba->host->host_lock, flags);
	hba->active_uic_cmd = NULL;
	spin_unlock_irqrestore(hba->host->host_lock, flags);

	return ret;
}

/**
 * __ufshcd_send_uic_cmd - Send UIC commands and retrieve the result
 * @hba: per adapter instance
 * @uic_cmd: UIC command
 *
 * Identical to ufshcd_send_uic_cmd() expect mutex. Must be called
941
 * with mutex held and host_lock locked.
942 943 944 945 946 947 948 949 950 951 952 953 954 955 956
 * Returns 0 only if success.
 */
static int
__ufshcd_send_uic_cmd(struct ufs_hba *hba, struct uic_command *uic_cmd)
{
	if (!ufshcd_ready_for_uic_cmd(hba)) {
		dev_err(hba->dev,
			"Controller not ready to accept UIC commands\n");
		return -EIO;
	}

	init_completion(&uic_cmd->done);

	ufshcd_dispatch_uic_cmd(hba, uic_cmd);

957
	return 0;
958 959 960 961 962 963 964 965 966 967 968 969 970
}

/**
 * ufshcd_send_uic_cmd - Send UIC commands and retrieve the result
 * @hba: per adapter instance
 * @uic_cmd: UIC command
 *
 * Returns 0 only if success.
 */
static int
ufshcd_send_uic_cmd(struct ufs_hba *hba, struct uic_command *uic_cmd)
{
	int ret;
971
	unsigned long flags;
972

973
	ufshcd_hold(hba, false);
974
	mutex_lock(&hba->uic_cmd_mutex);
975
	spin_lock_irqsave(hba->host->host_lock, flags);
976
	ret = __ufshcd_send_uic_cmd(hba, uic_cmd);
977 978 979 980
	spin_unlock_irqrestore(hba->host->host_lock, flags);
	if (!ret)
		ret = ufshcd_wait_for_uic_cmd(hba, uic_cmd);

981 982
	mutex_unlock(&hba->uic_cmd_mutex);

983
	ufshcd_release(hba);
984 985 986
	return ret;
}

987 988 989 990 991 992 993 994 995 996 997 998 999 1000 1001 1002 1003 1004 1005 1006 1007 1008 1009 1010 1011 1012 1013 1014 1015 1016 1017 1018 1019 1020 1021 1022 1023 1024 1025 1026 1027
/**
 * ufshcd_map_sg - Map scatter-gather list to prdt
 * @lrbp - pointer to local reference block
 *
 * Returns 0 in case of success, non-zero value in case of failure
 */
static int ufshcd_map_sg(struct ufshcd_lrb *lrbp)
{
	struct ufshcd_sg_entry *prd_table;
	struct scatterlist *sg;
	struct scsi_cmnd *cmd;
	int sg_segments;
	int i;

	cmd = lrbp->cmd;
	sg_segments = scsi_dma_map(cmd);
	if (sg_segments < 0)
		return sg_segments;

	if (sg_segments) {
		lrbp->utr_descriptor_ptr->prd_table_length =
					cpu_to_le16((u16) (sg_segments));

		prd_table = (struct ufshcd_sg_entry *)lrbp->ucd_prdt_ptr;

		scsi_for_each_sg(cmd, sg, sg_segments, i) {
			prd_table[i].size  =
				cpu_to_le32(((u32) sg_dma_len(sg))-1);
			prd_table[i].base_addr =
				cpu_to_le32(lower_32_bits(sg->dma_address));
			prd_table[i].upper_addr =
				cpu_to_le32(upper_32_bits(sg->dma_address));
		}
	} else {
		lrbp->utr_descriptor_ptr->prd_table_length = 0;
	}

	return 0;
}

/**
1028
 * ufshcd_enable_intr - enable interrupts
1029
 * @hba: per adapter instance
1030
 * @intrs: interrupt bits
1031
 */
1032
static void ufshcd_enable_intr(struct ufs_hba *hba, u32 intrs)
1033
{
1034 1035 1036 1037 1038 1039 1040 1041 1042 1043 1044 1045 1046 1047 1048 1049 1050 1051 1052 1053 1054 1055 1056 1057 1058 1059 1060 1061 1062 1063
	u32 set = ufshcd_readl(hba, REG_INTERRUPT_ENABLE);

	if (hba->ufs_version == UFSHCI_VERSION_10) {
		u32 rw;
		rw = set & INTERRUPT_MASK_RW_VER_10;
		set = rw | ((set ^ intrs) & intrs);
	} else {
		set |= intrs;
	}

	ufshcd_writel(hba, set, REG_INTERRUPT_ENABLE);
}

/**
 * ufshcd_disable_intr - disable interrupts
 * @hba: per adapter instance
 * @intrs: interrupt bits
 */
static void ufshcd_disable_intr(struct ufs_hba *hba, u32 intrs)
{
	u32 set = ufshcd_readl(hba, REG_INTERRUPT_ENABLE);

	if (hba->ufs_version == UFSHCI_VERSION_10) {
		u32 rw;
		rw = (set & INTERRUPT_MASK_RW_VER_10) &
			~(intrs & INTERRUPT_MASK_RW_VER_10);
		set = rw | ((set & intrs) & ~INTERRUPT_MASK_RW_VER_10);

	} else {
		set &= ~intrs;
1064
	}
1065 1066

	ufshcd_writel(hba, set, REG_INTERRUPT_ENABLE);
1067 1068
}

1069 1070 1071 1072 1073 1074 1075 1076 1077 1078 1079 1080 1081 1082 1083 1084 1085 1086 1087 1088 1089 1090 1091 1092 1093 1094 1095 1096 1097 1098 1099 1100 1101 1102 1103 1104 1105 1106 1107 1108 1109 1110 1111 1112 1113 1114 1115 1116 1117 1118 1119 1120 1121 1122 1123 1124 1125 1126 1127 1128 1129 1130 1131 1132 1133 1134 1135 1136 1137 1138
/**
 * ufshcd_prepare_req_desc_hdr() - Fills the requests header
 * descriptor according to request
 * @lrbp: pointer to local reference block
 * @upiu_flags: flags required in the header
 * @cmd_dir: requests data direction
 */
static void ufshcd_prepare_req_desc_hdr(struct ufshcd_lrb *lrbp,
		u32 *upiu_flags, enum dma_data_direction cmd_dir)
{
	struct utp_transfer_req_desc *req_desc = lrbp->utr_descriptor_ptr;
	u32 data_direction;
	u32 dword_0;

	if (cmd_dir == DMA_FROM_DEVICE) {
		data_direction = UTP_DEVICE_TO_HOST;
		*upiu_flags = UPIU_CMD_FLAGS_READ;
	} else if (cmd_dir == DMA_TO_DEVICE) {
		data_direction = UTP_HOST_TO_DEVICE;
		*upiu_flags = UPIU_CMD_FLAGS_WRITE;
	} else {
		data_direction = UTP_NO_DATA_TRANSFER;
		*upiu_flags = UPIU_CMD_FLAGS_NONE;
	}

	dword_0 = data_direction | (lrbp->command_type
				<< UPIU_COMMAND_TYPE_OFFSET);
	if (lrbp->intr_cmd)
		dword_0 |= UTP_REQ_DESC_INT_CMD;

	/* Transfer request descriptor header fields */
	req_desc->header.dword_0 = cpu_to_le32(dword_0);

	/*
	 * assigning invalid value for command status. Controller
	 * updates OCS on command completion, with the command
	 * status
	 */
	req_desc->header.dword_2 =
		cpu_to_le32(OCS_INVALID_COMMAND_STATUS);
}

/**
 * ufshcd_prepare_utp_scsi_cmd_upiu() - fills the utp_transfer_req_desc,
 * for scsi commands
 * @lrbp - local reference block pointer
 * @upiu_flags - flags
 */
static
void ufshcd_prepare_utp_scsi_cmd_upiu(struct ufshcd_lrb *lrbp, u32 upiu_flags)
{
	struct utp_upiu_req *ucd_req_ptr = lrbp->ucd_req_ptr;

	/* command descriptor fields */
	ucd_req_ptr->header.dword_0 = UPIU_HEADER_DWORD(
				UPIU_TRANSACTION_COMMAND, upiu_flags,
				lrbp->lun, lrbp->task_tag);
	ucd_req_ptr->header.dword_1 = UPIU_HEADER_DWORD(
				UPIU_COMMAND_SET_TYPE_SCSI, 0, 0, 0);

	/* Total EHS length and Data segment length will be zero */
	ucd_req_ptr->header.dword_2 = 0;

	ucd_req_ptr->sc.exp_data_transfer_len =
		cpu_to_be32(lrbp->cmd->sdb.length);

	memcpy(ucd_req_ptr->sc.cdb, lrbp->cmd->cmnd,
		(min_t(unsigned short, lrbp->cmd->cmd_len, MAX_CDB_SIZE)));
}

1139 1140 1141 1142 1143 1144 1145 1146 1147 1148 1149 1150
/**
 * ufshcd_prepare_utp_query_req_upiu() - fills the utp_transfer_req_desc,
 * for query requsts
 * @hba: UFS hba
 * @lrbp: local reference block pointer
 * @upiu_flags: flags
 */
static void ufshcd_prepare_utp_query_req_upiu(struct ufs_hba *hba,
				struct ufshcd_lrb *lrbp, u32 upiu_flags)
{
	struct utp_upiu_req *ucd_req_ptr = lrbp->ucd_req_ptr;
	struct ufs_query *query = &hba->dev_cmd.query;
1151
	u16 len = be16_to_cpu(query->request.upiu_req.length);
1152 1153 1154 1155 1156 1157 1158 1159 1160 1161 1162 1163 1164 1165 1166 1167 1168 1169
	u8 *descp = (u8 *)lrbp->ucd_req_ptr + GENERAL_UPIU_REQUEST_SIZE;

	/* Query request header */
	ucd_req_ptr->header.dword_0 = UPIU_HEADER_DWORD(
			UPIU_TRANSACTION_QUERY_REQ, upiu_flags,
			lrbp->lun, lrbp->task_tag);
	ucd_req_ptr->header.dword_1 = UPIU_HEADER_DWORD(
			0, query->request.query_func, 0, 0);

	/* Data segment length */
	ucd_req_ptr->header.dword_2 = UPIU_HEADER_DWORD(
			0, 0, len >> 8, (u8)len);

	/* Copy the Query Request buffer as is */
	memcpy(&ucd_req_ptr->qr, &query->request.upiu_req,
			QUERY_OSF_SIZE);

	/* Copy the Descriptor */
1170 1171 1172
	if (query->request.upiu_req.opcode == UPIU_QUERY_OPCODE_WRITE_DESC)
		memcpy(descp, query->descriptor, len);

1173 1174
}

1175 1176 1177 1178 1179 1180 1181 1182 1183 1184 1185 1186
static inline void ufshcd_prepare_utp_nop_upiu(struct ufshcd_lrb *lrbp)
{
	struct utp_upiu_req *ucd_req_ptr = lrbp->ucd_req_ptr;

	memset(ucd_req_ptr, 0, sizeof(struct utp_upiu_req));

	/* command descriptor fields */
	ucd_req_ptr->header.dword_0 =
		UPIU_HEADER_DWORD(
			UPIU_TRANSACTION_NOP_OUT, 0, 0, lrbp->task_tag);
}

1187 1188
/**
 * ufshcd_compose_upiu - form UFS Protocol Information Unit(UPIU)
1189
 * @hba - per adapter instance
1190 1191
 * @lrb - pointer to local reference block
 */
1192
static int ufshcd_compose_upiu(struct ufs_hba *hba, struct ufshcd_lrb *lrbp)
1193 1194
{
	u32 upiu_flags;
1195
	int ret = 0;
1196 1197 1198

	switch (lrbp->command_type) {
	case UTP_CMD_TYPE_SCSI:
1199 1200 1201 1202
		if (likely(lrbp->cmd)) {
			ufshcd_prepare_req_desc_hdr(lrbp, &upiu_flags,
					lrbp->cmd->sc_data_direction);
			ufshcd_prepare_utp_scsi_cmd_upiu(lrbp, upiu_flags);
1203
		} else {
1204
			ret = -EINVAL;
1205 1206 1207
		}
		break;
	case UTP_CMD_TYPE_DEV_MANAGE:
1208
		ufshcd_prepare_req_desc_hdr(lrbp, &upiu_flags, DMA_NONE);
1209 1210 1211 1212
		if (hba->dev_cmd.type == DEV_CMD_TYPE_QUERY)
			ufshcd_prepare_utp_query_req_upiu(
					hba, lrbp, upiu_flags);
		else if (hba->dev_cmd.type == DEV_CMD_TYPE_NOP)
1213 1214 1215
			ufshcd_prepare_utp_nop_upiu(lrbp);
		else
			ret = -EINVAL;
1216 1217 1218
		break;
	case UTP_CMD_TYPE_UFS:
		/* For UFS native command implementation */
1219 1220 1221 1222 1223 1224 1225 1226
		ret = -ENOTSUPP;
		dev_err(hba->dev, "%s: UFS native command are not supported\n",
			__func__);
		break;
	default:
		ret = -ENOTSUPP;
		dev_err(hba->dev, "%s: unknown command type: 0x%x\n",
				__func__, lrbp->command_type);
1227 1228
		break;
	} /* end of switch */
1229 1230

	return ret;
1231 1232
}

1233 1234 1235 1236 1237 1238 1239 1240 1241 1242 1243 1244 1245 1246 1247
/*
 * ufshcd_scsi_to_upiu_lun - maps scsi LUN to UPIU LUN
 * @scsi_lun: scsi LUN id
 *
 * Returns UPIU LUN id
 */
static inline u8 ufshcd_scsi_to_upiu_lun(unsigned int scsi_lun)
{
	if (scsi_is_wlun(scsi_lun))
		return (scsi_lun & UFS_UPIU_MAX_UNIT_NUM_ID)
			| UFS_UPIU_WLUN_ID;
	else
		return scsi_lun & UFS_UPIU_MAX_UNIT_NUM_ID;
}

1248 1249 1250 1251 1252 1253 1254 1255 1256 1257 1258
/**
 * ufshcd_upiu_wlun_to_scsi_wlun - maps UPIU W-LUN id to SCSI W-LUN ID
 * @scsi_lun: UPIU W-LUN id
 *
 * Returns SCSI W-LUN id
 */
static inline u16 ufshcd_upiu_wlun_to_scsi_wlun(u8 upiu_wlun_id)
{
	return (upiu_wlun_id & ~UFS_UPIU_WLUN_ID) | SCSI_W_LUN_BASE;
}

1259 1260 1261 1262 1263 1264 1265 1266 1267 1268 1269 1270 1271 1272 1273 1274 1275 1276 1277
/**
 * ufshcd_queuecommand - main entry point for SCSI requests
 * @cmd: command from SCSI Midlayer
 * @done: call back function
 *
 * Returns 0 for success, non-zero in case of failure
 */
static int ufshcd_queuecommand(struct Scsi_Host *host, struct scsi_cmnd *cmd)
{
	struct ufshcd_lrb *lrbp;
	struct ufs_hba *hba;
	unsigned long flags;
	int tag;
	int err = 0;

	hba = shost_priv(host);

	tag = cmd->request->tag;

1278 1279 1280 1281 1282
	spin_lock_irqsave(hba->host->host_lock, flags);
	switch (hba->ufshcd_state) {
	case UFSHCD_STATE_OPERATIONAL:
		break;
	case UFSHCD_STATE_RESET:
1283
		err = SCSI_MLQUEUE_HOST_BUSY;
1284 1285 1286 1287 1288 1289 1290 1291 1292 1293 1294
		goto out_unlock;
	case UFSHCD_STATE_ERROR:
		set_host_byte(cmd, DID_ERROR);
		cmd->scsi_done(cmd);
		goto out_unlock;
	default:
		dev_WARN_ONCE(hba->dev, 1, "%s: invalid state %d\n",
				__func__, hba->ufshcd_state);
		set_host_byte(cmd, DID_BAD_TARGET);
		cmd->scsi_done(cmd);
		goto out_unlock;
1295
	}
1296
	spin_unlock_irqrestore(hba->host->host_lock, flags);
1297

1298 1299 1300 1301 1302 1303 1304 1305 1306 1307 1308 1309
	/* acquire the tag to make sure device cmds don't use it */
	if (test_and_set_bit_lock(tag, &hba->lrb_in_use)) {
		/*
		 * Dev manage command in progress, requeue the command.
		 * Requeuing the command helps in cases where the request *may*
		 * find different tag instead of waiting for dev manage command
		 * completion.
		 */
		err = SCSI_MLQUEUE_HOST_BUSY;
		goto out;
	}

1310 1311 1312 1313 1314 1315 1316 1317
	err = ufshcd_hold(hba, true);
	if (err) {
		err = SCSI_MLQUEUE_HOST_BUSY;
		clear_bit_unlock(tag, &hba->lrb_in_use);
		goto out;
	}
	WARN_ON(hba->clk_gating.state != CLKS_ON);

1318 1319
	lrbp = &hba->lrb[tag];

1320
	WARN_ON(lrbp->cmd);
1321 1322 1323 1324
	lrbp->cmd = cmd;
	lrbp->sense_bufflen = SCSI_SENSE_BUFFERSIZE;
	lrbp->sense_buffer = cmd->sense_buffer;
	lrbp->task_tag = tag;
1325
	lrbp->lun = ufshcd_scsi_to_upiu_lun(cmd->device->lun);
1326
	lrbp->intr_cmd = false;
1327 1328 1329
	lrbp->command_type = UTP_CMD_TYPE_SCSI;

	/* form UPIU before issuing the command */
1330
	ufshcd_compose_upiu(hba, lrbp);
1331
	err = ufshcd_map_sg(lrbp);
1332 1333 1334
	if (err) {
		lrbp->cmd = NULL;
		clear_bit_unlock(tag, &hba->lrb_in_use);
1335
		goto out;
1336
	}
1337 1338 1339 1340

	/* issue command to the controller */
	spin_lock_irqsave(hba->host->host_lock, flags);
	ufshcd_send_command(hba, tag);
1341
out_unlock:
1342 1343 1344 1345 1346
	spin_unlock_irqrestore(hba->host->host_lock, flags);
out:
	return err;
}

1347 1348 1349 1350 1351 1352 1353 1354 1355 1356 1357 1358 1359 1360 1361 1362 1363 1364 1365 1366 1367 1368 1369 1370 1371 1372 1373 1374 1375 1376 1377 1378 1379 1380 1381 1382 1383 1384
static int ufshcd_compose_dev_cmd(struct ufs_hba *hba,
		struct ufshcd_lrb *lrbp, enum dev_cmd_type cmd_type, int tag)
{
	lrbp->cmd = NULL;
	lrbp->sense_bufflen = 0;
	lrbp->sense_buffer = NULL;
	lrbp->task_tag = tag;
	lrbp->lun = 0; /* device management cmd is not specific to any LUN */
	lrbp->command_type = UTP_CMD_TYPE_DEV_MANAGE;
	lrbp->intr_cmd = true; /* No interrupt aggregation */
	hba->dev_cmd.type = cmd_type;

	return ufshcd_compose_upiu(hba, lrbp);
}

static int
ufshcd_clear_cmd(struct ufs_hba *hba, int tag)
{
	int err = 0;
	unsigned long flags;
	u32 mask = 1 << tag;

	/* clear outstanding transaction before retry */
	spin_lock_irqsave(hba->host->host_lock, flags);
	ufshcd_utrl_clear(hba, tag);
	spin_unlock_irqrestore(hba->host->host_lock, flags);

	/*
	 * wait for for h/w to clear corresponding bit in door-bell.
	 * max. wait is 1 sec.
	 */
	err = ufshcd_wait_for_register(hba,
			REG_UTP_TRANSFER_REQ_DOOR_BELL,
			mask, ~mask, 1000, 1000);

	return err;
}

1385 1386 1387 1388 1389 1390 1391 1392 1393 1394 1395
static int
ufshcd_check_query_response(struct ufs_hba *hba, struct ufshcd_lrb *lrbp)
{
	struct ufs_query_res *query_res = &hba->dev_cmd.query.response;

	/* Get the UPIU response */
	query_res->response = ufshcd_get_rsp_upiu_result(lrbp->ucd_rsp_ptr) >>
				UPIU_RSP_CODE_OFFSET;
	return query_res->response;
}

1396 1397 1398 1399 1400 1401 1402 1403 1404 1405 1406 1407 1408 1409 1410 1411 1412 1413 1414 1415 1416
/**
 * ufshcd_dev_cmd_completion() - handles device management command responses
 * @hba: per adapter instance
 * @lrbp: pointer to local reference block
 */
static int
ufshcd_dev_cmd_completion(struct ufs_hba *hba, struct ufshcd_lrb *lrbp)
{
	int resp;
	int err = 0;

	resp = ufshcd_get_req_rsp(lrbp->ucd_rsp_ptr);

	switch (resp) {
	case UPIU_TRANSACTION_NOP_IN:
		if (hba->dev_cmd.type != DEV_CMD_TYPE_NOP) {
			err = -EINVAL;
			dev_err(hba->dev, "%s: unexpected response %x\n",
					__func__, resp);
		}
		break;
1417
	case UPIU_TRANSACTION_QUERY_RSP:
1418 1419 1420
		err = ufshcd_check_query_response(hba, lrbp);
		if (!err)
			err = ufshcd_copy_query_response(hba, lrbp);
1421
		break;
1422 1423 1424 1425 1426 1427 1428 1429 1430 1431 1432 1433 1434 1435 1436 1437 1438 1439 1440 1441 1442 1443 1444 1445 1446 1447 1448 1449 1450 1451 1452 1453 1454 1455 1456 1457 1458 1459 1460 1461 1462 1463 1464 1465 1466 1467 1468 1469 1470 1471 1472 1473 1474 1475 1476 1477 1478 1479 1480 1481 1482 1483 1484 1485 1486 1487 1488 1489 1490 1491 1492 1493 1494 1495 1496 1497 1498 1499 1500 1501 1502 1503 1504 1505 1506 1507 1508 1509 1510
	case UPIU_TRANSACTION_REJECT_UPIU:
		/* TODO: handle Reject UPIU Response */
		err = -EPERM;
		dev_err(hba->dev, "%s: Reject UPIU not fully implemented\n",
				__func__);
		break;
	default:
		err = -EINVAL;
		dev_err(hba->dev, "%s: Invalid device management cmd response: %x\n",
				__func__, resp);
		break;
	}

	return err;
}

static int ufshcd_wait_for_dev_cmd(struct ufs_hba *hba,
		struct ufshcd_lrb *lrbp, int max_timeout)
{
	int err = 0;
	unsigned long time_left;
	unsigned long flags;

	time_left = wait_for_completion_timeout(hba->dev_cmd.complete,
			msecs_to_jiffies(max_timeout));

	spin_lock_irqsave(hba->host->host_lock, flags);
	hba->dev_cmd.complete = NULL;
	if (likely(time_left)) {
		err = ufshcd_get_tr_ocs(lrbp);
		if (!err)
			err = ufshcd_dev_cmd_completion(hba, lrbp);
	}
	spin_unlock_irqrestore(hba->host->host_lock, flags);

	if (!time_left) {
		err = -ETIMEDOUT;
		if (!ufshcd_clear_cmd(hba, lrbp->task_tag))
			/* sucessfully cleared the command, retry if needed */
			err = -EAGAIN;
	}

	return err;
}

/**
 * ufshcd_get_dev_cmd_tag - Get device management command tag
 * @hba: per-adapter instance
 * @tag: pointer to variable with available slot value
 *
 * Get a free slot and lock it until device management command
 * completes.
 *
 * Returns false if free slot is unavailable for locking, else
 * return true with tag value in @tag.
 */
static bool ufshcd_get_dev_cmd_tag(struct ufs_hba *hba, int *tag_out)
{
	int tag;
	bool ret = false;
	unsigned long tmp;

	if (!tag_out)
		goto out;

	do {
		tmp = ~hba->lrb_in_use;
		tag = find_last_bit(&tmp, hba->nutrs);
		if (tag >= hba->nutrs)
			goto out;
	} while (test_and_set_bit_lock(tag, &hba->lrb_in_use));

	*tag_out = tag;
	ret = true;
out:
	return ret;
}

static inline void ufshcd_put_dev_cmd_tag(struct ufs_hba *hba, int tag)
{
	clear_bit_unlock(tag, &hba->lrb_in_use);
}

/**
 * ufshcd_exec_dev_cmd - API for sending device management requests
 * @hba - UFS hba
 * @cmd_type - specifies the type (NOP, Query...)
 * @timeout - time in seconds
 *
1511 1512
 * NOTE: Since there is only one available tag for device management commands,
 * it is expected you hold the hba->dev_cmd.lock mutex.
1513 1514 1515 1516 1517 1518 1519 1520 1521 1522 1523 1524 1525 1526 1527 1528 1529 1530 1531 1532 1533 1534 1535 1536 1537 1538 1539 1540 1541 1542 1543 1544 1545 1546 1547 1548 1549 1550
 */
static int ufshcd_exec_dev_cmd(struct ufs_hba *hba,
		enum dev_cmd_type cmd_type, int timeout)
{
	struct ufshcd_lrb *lrbp;
	int err;
	int tag;
	struct completion wait;
	unsigned long flags;

	/*
	 * Get free slot, sleep if slots are unavailable.
	 * Even though we use wait_event() which sleeps indefinitely,
	 * the maximum wait time is bounded by SCSI request timeout.
	 */
	wait_event(hba->dev_cmd.tag_wq, ufshcd_get_dev_cmd_tag(hba, &tag));

	init_completion(&wait);
	lrbp = &hba->lrb[tag];
	WARN_ON(lrbp->cmd);
	err = ufshcd_compose_dev_cmd(hba, lrbp, cmd_type, tag);
	if (unlikely(err))
		goto out_put_tag;

	hba->dev_cmd.complete = &wait;

	spin_lock_irqsave(hba->host->host_lock, flags);
	ufshcd_send_command(hba, tag);
	spin_unlock_irqrestore(hba->host->host_lock, flags);

	err = ufshcd_wait_for_dev_cmd(hba, lrbp, timeout);

out_put_tag:
	ufshcd_put_dev_cmd_tag(hba, tag);
	wake_up(&hba->dev_cmd.tag_wq);
	return err;
}

D
Dolev Raviv 已提交
1551 1552 1553 1554 1555 1556 1557 1558 1559 1560 1561 1562 1563 1564 1565 1566 1567 1568 1569 1570 1571 1572 1573 1574
/**
 * ufshcd_init_query() - init the query response and request parameters
 * @hba: per-adapter instance
 * @request: address of the request pointer to be initialized
 * @response: address of the response pointer to be initialized
 * @opcode: operation to perform
 * @idn: flag idn to access
 * @index: LU number to access
 * @selector: query/flag/descriptor further identification
 */
static inline void ufshcd_init_query(struct ufs_hba *hba,
		struct ufs_query_req **request, struct ufs_query_res **response,
		enum query_opcode opcode, u8 idn, u8 index, u8 selector)
{
	*request = &hba->dev_cmd.query.request;
	*response = &hba->dev_cmd.query.response;
	memset(*request, 0, sizeof(struct ufs_query_req));
	memset(*response, 0, sizeof(struct ufs_query_res));
	(*request)->upiu_req.opcode = opcode;
	(*request)->upiu_req.idn = idn;
	(*request)->upiu_req.index = index;
	(*request)->upiu_req.selector = selector;
}

1575 1576 1577 1578 1579 1580 1581 1582 1583 1584 1585 1586
/**
 * ufshcd_query_flag() - API function for sending flag query requests
 * hba: per-adapter instance
 * query_opcode: flag query to perform
 * idn: flag idn to access
 * flag_res: the flag value after the query request completes
 *
 * Returns 0 for success, non-zero in case of failure
 */
static int ufshcd_query_flag(struct ufs_hba *hba, enum query_opcode opcode,
			enum flag_idn idn, bool *flag_res)
{
D
Dolev Raviv 已提交
1587 1588 1589
	struct ufs_query_req *request = NULL;
	struct ufs_query_res *response = NULL;
	int err, index = 0, selector = 0;
1590 1591 1592

	BUG_ON(!hba);

1593
	ufshcd_hold(hba, false);
1594
	mutex_lock(&hba->dev_cmd.lock);
D
Dolev Raviv 已提交
1595 1596
	ufshcd_init_query(hba, &request, &response, opcode, idn, index,
			selector);
1597 1598 1599 1600 1601 1602 1603 1604 1605 1606 1607 1608 1609 1610 1611 1612 1613 1614 1615 1616 1617 1618 1619 1620 1621

	switch (opcode) {
	case UPIU_QUERY_OPCODE_SET_FLAG:
	case UPIU_QUERY_OPCODE_CLEAR_FLAG:
	case UPIU_QUERY_OPCODE_TOGGLE_FLAG:
		request->query_func = UPIU_QUERY_FUNC_STANDARD_WRITE_REQUEST;
		break;
	case UPIU_QUERY_OPCODE_READ_FLAG:
		request->query_func = UPIU_QUERY_FUNC_STANDARD_READ_REQUEST;
		if (!flag_res) {
			/* No dummy reads */
			dev_err(hba->dev, "%s: Invalid argument for read request\n",
					__func__);
			err = -EINVAL;
			goto out_unlock;
		}
		break;
	default:
		dev_err(hba->dev,
			"%s: Expected query flag opcode but got = %d\n",
			__func__, opcode);
		err = -EINVAL;
		goto out_unlock;
	}

D
Dolev Raviv 已提交
1622
	err = ufshcd_exec_dev_cmd(hba, DEV_CMD_TYPE_QUERY, QUERY_REQ_TIMEOUT);
1623 1624 1625 1626 1627 1628 1629 1630 1631

	if (err) {
		dev_err(hba->dev,
			"%s: Sending flag query for idn %d failed, err = %d\n",
			__func__, idn, err);
		goto out_unlock;
	}

	if (flag_res)
1632
		*flag_res = (be32_to_cpu(response->upiu_res.value) &
1633 1634 1635 1636
				MASK_QUERY_UPIU_FLAG_LOC) & 0x1;

out_unlock:
	mutex_unlock(&hba->dev_cmd.lock);
1637
	ufshcd_release(hba);
1638 1639 1640
	return err;
}

1641 1642 1643 1644 1645 1646 1647 1648 1649 1650 1651
/**
 * ufshcd_query_attr - API function for sending attribute requests
 * hba: per-adapter instance
 * opcode: attribute opcode
 * idn: attribute idn to access
 * index: index field
 * selector: selector field
 * attr_val: the attribute value after the query request completes
 *
 * Returns 0 for success, non-zero in case of failure
*/
1652
static int ufshcd_query_attr(struct ufs_hba *hba, enum query_opcode opcode,
1653 1654
			enum attr_idn idn, u8 index, u8 selector, u32 *attr_val)
{
D
Dolev Raviv 已提交
1655 1656
	struct ufs_query_req *request = NULL;
	struct ufs_query_res *response = NULL;
1657 1658 1659 1660
	int err;

	BUG_ON(!hba);

1661
	ufshcd_hold(hba, false);
1662 1663 1664 1665 1666 1667 1668 1669
	if (!attr_val) {
		dev_err(hba->dev, "%s: attribute value required for opcode 0x%x\n",
				__func__, opcode);
		err = -EINVAL;
		goto out;
	}

	mutex_lock(&hba->dev_cmd.lock);
D
Dolev Raviv 已提交
1670 1671
	ufshcd_init_query(hba, &request, &response, opcode, idn, index,
			selector);
1672 1673 1674 1675

	switch (opcode) {
	case UPIU_QUERY_OPCODE_WRITE_ATTR:
		request->query_func = UPIU_QUERY_FUNC_STANDARD_WRITE_REQUEST;
1676
		request->upiu_req.value = cpu_to_be32(*attr_val);
1677 1678 1679 1680 1681 1682 1683 1684 1685 1686 1687
		break;
	case UPIU_QUERY_OPCODE_READ_ATTR:
		request->query_func = UPIU_QUERY_FUNC_STANDARD_READ_REQUEST;
		break;
	default:
		dev_err(hba->dev, "%s: Expected query attr opcode but got = 0x%.2x\n",
				__func__, opcode);
		err = -EINVAL;
		goto out_unlock;
	}

D
Dolev Raviv 已提交
1688
	err = ufshcd_exec_dev_cmd(hba, DEV_CMD_TYPE_QUERY, QUERY_REQ_TIMEOUT);
1689 1690 1691 1692 1693 1694 1695

	if (err) {
		dev_err(hba->dev, "%s: opcode 0x%.2x for idn %d failed, err = %d\n",
				__func__, opcode, idn, err);
		goto out_unlock;
	}

1696
	*attr_val = be32_to_cpu(response->upiu_res.value);
1697 1698 1699 1700

out_unlock:
	mutex_unlock(&hba->dev_cmd.lock);
out:
1701
	ufshcd_release(hba);
1702 1703 1704
	return err;
}

D
Dolev Raviv 已提交
1705 1706 1707 1708 1709 1710 1711 1712 1713 1714 1715 1716 1717 1718
/**
 * ufshcd_query_descriptor - API function for sending descriptor requests
 * hba: per-adapter instance
 * opcode: attribute opcode
 * idn: attribute idn to access
 * index: index field
 * selector: selector field
 * desc_buf: the buffer that contains the descriptor
 * buf_len: length parameter passed to the device
 *
 * Returns 0 for success, non-zero in case of failure.
 * The buf_len parameter will contain, on return, the length parameter
 * received on the response.
 */
1719
static int ufshcd_query_descriptor(struct ufs_hba *hba,
D
Dolev Raviv 已提交
1720 1721 1722 1723 1724 1725 1726 1727 1728
			enum query_opcode opcode, enum desc_idn idn, u8 index,
			u8 selector, u8 *desc_buf, int *buf_len)
{
	struct ufs_query_req *request = NULL;
	struct ufs_query_res *response = NULL;
	int err;

	BUG_ON(!hba);

1729
	ufshcd_hold(hba, false);
D
Dolev Raviv 已提交
1730 1731 1732 1733 1734 1735 1736 1737 1738 1739 1740 1741 1742 1743 1744 1745 1746 1747
	if (!desc_buf) {
		dev_err(hba->dev, "%s: descriptor buffer required for opcode 0x%x\n",
				__func__, opcode);
		err = -EINVAL;
		goto out;
	}

	if (*buf_len <= QUERY_DESC_MIN_SIZE || *buf_len > QUERY_DESC_MAX_SIZE) {
		dev_err(hba->dev, "%s: descriptor buffer size (%d) is out of range\n",
				__func__, *buf_len);
		err = -EINVAL;
		goto out;
	}

	mutex_lock(&hba->dev_cmd.lock);
	ufshcd_init_query(hba, &request, &response, opcode, idn, index,
			selector);
	hba->dev_cmd.query.descriptor = desc_buf;
1748
	request->upiu_req.length = cpu_to_be16(*buf_len);
D
Dolev Raviv 已提交
1749 1750 1751 1752 1753 1754 1755 1756 1757 1758 1759 1760 1761 1762 1763 1764 1765 1766 1767 1768 1769 1770 1771 1772 1773

	switch (opcode) {
	case UPIU_QUERY_OPCODE_WRITE_DESC:
		request->query_func = UPIU_QUERY_FUNC_STANDARD_WRITE_REQUEST;
		break;
	case UPIU_QUERY_OPCODE_READ_DESC:
		request->query_func = UPIU_QUERY_FUNC_STANDARD_READ_REQUEST;
		break;
	default:
		dev_err(hba->dev,
				"%s: Expected query descriptor opcode but got = 0x%.2x\n",
				__func__, opcode);
		err = -EINVAL;
		goto out_unlock;
	}

	err = ufshcd_exec_dev_cmd(hba, DEV_CMD_TYPE_QUERY, QUERY_REQ_TIMEOUT);

	if (err) {
		dev_err(hba->dev, "%s: opcode 0x%.2x for idn %d failed, err = %d\n",
				__func__, opcode, idn, err);
		goto out_unlock;
	}

	hba->dev_cmd.query.descriptor = NULL;
1774
	*buf_len = be16_to_cpu(response->upiu_res.length);
D
Dolev Raviv 已提交
1775 1776 1777 1778

out_unlock:
	mutex_unlock(&hba->dev_cmd.lock);
out:
1779
	ufshcd_release(hba);
D
Dolev Raviv 已提交
1780 1781 1782
	return err;
}

1783 1784 1785 1786 1787 1788 1789 1790 1791 1792 1793 1794 1795 1796 1797 1798 1799 1800 1801 1802 1803 1804 1805 1806 1807 1808 1809 1810 1811 1812 1813 1814 1815 1816 1817 1818 1819 1820 1821 1822 1823 1824 1825 1826 1827 1828 1829 1830 1831 1832 1833 1834 1835 1836 1837 1838 1839 1840 1841 1842 1843 1844 1845 1846 1847 1848 1849 1850 1851 1852 1853 1854 1855 1856 1857 1858 1859 1860 1861 1862 1863 1864 1865 1866 1867 1868 1869 1870 1871 1872 1873 1874 1875 1876 1877 1878 1879 1880 1881 1882 1883 1884
/**
 * ufshcd_read_desc_param - read the specified descriptor parameter
 * @hba: Pointer to adapter instance
 * @desc_id: descriptor idn value
 * @desc_index: descriptor index
 * @param_offset: offset of the parameter to read
 * @param_read_buf: pointer to buffer where parameter would be read
 * @param_size: sizeof(param_read_buf)
 *
 * Return 0 in case of success, non-zero otherwise
 */
static int ufshcd_read_desc_param(struct ufs_hba *hba,
				  enum desc_idn desc_id,
				  int desc_index,
				  u32 param_offset,
				  u8 *param_read_buf,
				  u32 param_size)
{
	int ret;
	u8 *desc_buf;
	u32 buff_len;
	bool is_kmalloc = true;

	/* safety checks */
	if (desc_id >= QUERY_DESC_IDN_MAX)
		return -EINVAL;

	buff_len = ufs_query_desc_max_size[desc_id];
	if ((param_offset + param_size) > buff_len)
		return -EINVAL;

	if (!param_offset && (param_size == buff_len)) {
		/* memory space already available to hold full descriptor */
		desc_buf = param_read_buf;
		is_kmalloc = false;
	} else {
		/* allocate memory to hold full descriptor */
		desc_buf = kmalloc(buff_len, GFP_KERNEL);
		if (!desc_buf)
			return -ENOMEM;
	}

	ret = ufshcd_query_descriptor(hba, UPIU_QUERY_OPCODE_READ_DESC,
				      desc_id, desc_index, 0, desc_buf,
				      &buff_len);

	if (ret || (buff_len < ufs_query_desc_max_size[desc_id]) ||
	    (desc_buf[QUERY_DESC_LENGTH_OFFSET] !=
	     ufs_query_desc_max_size[desc_id])
	    || (desc_buf[QUERY_DESC_DESC_TYPE_OFFSET] != desc_id)) {
		dev_err(hba->dev, "%s: Failed reading descriptor. desc_id %d param_offset %d buff_len %d ret %d",
			__func__, desc_id, param_offset, buff_len, ret);
		if (!ret)
			ret = -EINVAL;

		goto out;
	}

	if (is_kmalloc)
		memcpy(param_read_buf, &desc_buf[param_offset], param_size);
out:
	if (is_kmalloc)
		kfree(desc_buf);
	return ret;
}

static inline int ufshcd_read_desc(struct ufs_hba *hba,
				   enum desc_idn desc_id,
				   int desc_index,
				   u8 *buf,
				   u32 size)
{
	return ufshcd_read_desc_param(hba, desc_id, desc_index, 0, buf, size);
}

static inline int ufshcd_read_power_desc(struct ufs_hba *hba,
					 u8 *buf,
					 u32 size)
{
	return ufshcd_read_desc(hba, QUERY_DESC_IDN_POWER, 0, buf, size);
}

/**
 * ufshcd_read_unit_desc_param - read the specified unit descriptor parameter
 * @hba: Pointer to adapter instance
 * @lun: lun id
 * @param_offset: offset of the parameter to read
 * @param_read_buf: pointer to buffer where parameter would be read
 * @param_size: sizeof(param_read_buf)
 *
 * Return 0 in case of success, non-zero otherwise
 */
static inline int ufshcd_read_unit_desc_param(struct ufs_hba *hba,
					      int lun,
					      enum unit_desc_param param_offset,
					      u8 *param_read_buf,
					      u32 param_size)
{
	/*
	 * Unit descriptors are only available for general purpose LUs (LUN id
	 * from 0 to 7) and RPMB Well known LU.
	 */
1885
	if (lun != UFS_UPIU_RPMB_WLUN && (lun >= UFS_UPIU_MAX_GENERAL_LUN))
1886 1887 1888 1889 1890 1891
		return -EOPNOTSUPP;

	return ufshcd_read_desc_param(hba, QUERY_DESC_IDN_UNIT, lun,
				      param_offset, param_read_buf, param_size);
}

1892 1893 1894 1895 1896 1897 1898 1899 1900 1901 1902 1903 1904 1905 1906 1907 1908 1909 1910
/**
 * ufshcd_memory_alloc - allocate memory for host memory space data structures
 * @hba: per adapter instance
 *
 * 1. Allocate DMA memory for Command Descriptor array
 *	Each command descriptor consist of Command UPIU, Response UPIU and PRDT
 * 2. Allocate DMA memory for UTP Transfer Request Descriptor List (UTRDL).
 * 3. Allocate DMA memory for UTP Task Management Request Descriptor List
 *	(UTMRDL)
 * 4. Allocate memory for local reference block(lrb).
 *
 * Returns 0 for success, non-zero in case of failure
 */
static int ufshcd_memory_alloc(struct ufs_hba *hba)
{
	size_t utmrdl_size, utrdl_size, ucdl_size;

	/* Allocate memory for UTP command descriptors */
	ucdl_size = (sizeof(struct utp_transfer_cmd_desc) * hba->nutrs);
1911 1912 1913 1914
	hba->ucdl_base_addr = dmam_alloc_coherent(hba->dev,
						  ucdl_size,
						  &hba->ucdl_dma_addr,
						  GFP_KERNEL);
1915 1916 1917 1918 1919 1920 1921 1922 1923

	/*
	 * UFSHCI requires UTP command descriptor to be 128 byte aligned.
	 * make sure hba->ucdl_dma_addr is aligned to PAGE_SIZE
	 * if hba->ucdl_dma_addr is aligned to PAGE_SIZE, then it will
	 * be aligned to 128 bytes as well
	 */
	if (!hba->ucdl_base_addr ||
	    WARN_ON(hba->ucdl_dma_addr & (PAGE_SIZE - 1))) {
1924
		dev_err(hba->dev,
1925 1926 1927 1928 1929 1930 1931 1932 1933
			"Command Descriptor Memory allocation failed\n");
		goto out;
	}

	/*
	 * Allocate memory for UTP Transfer descriptors
	 * UFSHCI requires 1024 byte alignment of UTRD
	 */
	utrdl_size = (sizeof(struct utp_transfer_req_desc) * hba->nutrs);
1934 1935 1936 1937
	hba->utrdl_base_addr = dmam_alloc_coherent(hba->dev,
						   utrdl_size,
						   &hba->utrdl_dma_addr,
						   GFP_KERNEL);
1938 1939
	if (!hba->utrdl_base_addr ||
	    WARN_ON(hba->utrdl_dma_addr & (PAGE_SIZE - 1))) {
1940
		dev_err(hba->dev,
1941 1942 1943 1944 1945 1946 1947 1948 1949
			"Transfer Descriptor Memory allocation failed\n");
		goto out;
	}

	/*
	 * Allocate memory for UTP Task Management descriptors
	 * UFSHCI requires 1024 byte alignment of UTMRD
	 */
	utmrdl_size = sizeof(struct utp_task_req_desc) * hba->nutmrs;
1950 1951 1952 1953
	hba->utmrdl_base_addr = dmam_alloc_coherent(hba->dev,
						    utmrdl_size,
						    &hba->utmrdl_dma_addr,
						    GFP_KERNEL);
1954 1955
	if (!hba->utmrdl_base_addr ||
	    WARN_ON(hba->utmrdl_dma_addr & (PAGE_SIZE - 1))) {
1956
		dev_err(hba->dev,
1957 1958 1959 1960 1961
		"Task Management Descriptor Memory allocation failed\n");
		goto out;
	}

	/* Allocate memory for local reference block */
1962 1963 1964
	hba->lrb = devm_kzalloc(hba->dev,
				hba->nutrs * sizeof(struct ufshcd_lrb),
				GFP_KERNEL);
1965
	if (!hba->lrb) {
1966
		dev_err(hba->dev, "LRB Memory allocation failed\n");
1967 1968 1969 1970 1971 1972 1973 1974 1975 1976 1977 1978 1979 1980 1981 1982 1983 1984 1985 1986 1987 1988 1989 1990 1991 1992 1993 1994 1995 1996 1997 1998 1999 2000 2001 2002 2003 2004 2005 2006 2007 2008 2009 2010 2011 2012 2013 2014 2015 2016 2017 2018 2019 2020 2021 2022 2023
		goto out;
	}
	return 0;
out:
	return -ENOMEM;
}

/**
 * ufshcd_host_memory_configure - configure local reference block with
 *				memory offsets
 * @hba: per adapter instance
 *
 * Configure Host memory space
 * 1. Update Corresponding UTRD.UCDBA and UTRD.UCDBAU with UCD DMA
 * address.
 * 2. Update each UTRD with Response UPIU offset, Response UPIU length
 * and PRDT offset.
 * 3. Save the corresponding addresses of UTRD, UCD.CMD, UCD.RSP and UCD.PRDT
 * into local reference block.
 */
static void ufshcd_host_memory_configure(struct ufs_hba *hba)
{
	struct utp_transfer_cmd_desc *cmd_descp;
	struct utp_transfer_req_desc *utrdlp;
	dma_addr_t cmd_desc_dma_addr;
	dma_addr_t cmd_desc_element_addr;
	u16 response_offset;
	u16 prdt_offset;
	int cmd_desc_size;
	int i;

	utrdlp = hba->utrdl_base_addr;
	cmd_descp = hba->ucdl_base_addr;

	response_offset =
		offsetof(struct utp_transfer_cmd_desc, response_upiu);
	prdt_offset =
		offsetof(struct utp_transfer_cmd_desc, prd_table);

	cmd_desc_size = sizeof(struct utp_transfer_cmd_desc);
	cmd_desc_dma_addr = hba->ucdl_dma_addr;

	for (i = 0; i < hba->nutrs; i++) {
		/* Configure UTRD with command descriptor base address */
		cmd_desc_element_addr =
				(cmd_desc_dma_addr + (cmd_desc_size * i));
		utrdlp[i].command_desc_base_addr_lo =
				cpu_to_le32(lower_32_bits(cmd_desc_element_addr));
		utrdlp[i].command_desc_base_addr_hi =
				cpu_to_le32(upper_32_bits(cmd_desc_element_addr));

		/* Response upiu and prdt offset should be in double words */
		utrdlp[i].response_upiu_offset =
				cpu_to_le16((response_offset >> 2));
		utrdlp[i].prd_table_offset =
				cpu_to_le16((prdt_offset >> 2));
		utrdlp[i].response_upiu_length =
2024
				cpu_to_le16(ALIGNED_UPIU_SIZE >> 2);
2025 2026

		hba->lrb[i].utr_descriptor_ptr = (utrdlp + i);
2027 2028
		hba->lrb[i].ucd_req_ptr =
			(struct utp_upiu_req *)(cmd_descp + i);
2029 2030 2031 2032 2033 2034 2035 2036 2037 2038 2039 2040 2041 2042 2043 2044 2045 2046 2047 2048
		hba->lrb[i].ucd_rsp_ptr =
			(struct utp_upiu_rsp *)cmd_descp[i].response_upiu;
		hba->lrb[i].ucd_prdt_ptr =
			(struct ufshcd_sg_entry *)cmd_descp[i].prd_table;
	}
}

/**
 * ufshcd_dme_link_startup - Notify Unipro to perform link startup
 * @hba: per adapter instance
 *
 * UIC_CMD_DME_LINK_STARTUP command must be issued to Unipro layer,
 * in order to initialize the Unipro link startup procedure.
 * Once the Unipro links are up, the device connected to the controller
 * is detected.
 *
 * Returns 0 on success, non-zero value on failure
 */
static int ufshcd_dme_link_startup(struct ufs_hba *hba)
{
2049 2050
	struct uic_command uic_cmd = {0};
	int ret;
2051

2052
	uic_cmd.command = UIC_CMD_DME_LINK_STARTUP;
2053

2054 2055 2056 2057 2058
	ret = ufshcd_send_uic_cmd(hba, &uic_cmd);
	if (ret)
		dev_err(hba->dev,
			"dme-link-startup: error code %d\n", ret);
	return ret;
2059 2060
}

2061 2062 2063 2064 2065 2066 2067 2068 2069 2070 2071 2072 2073 2074 2075 2076 2077 2078 2079 2080 2081 2082 2083 2084 2085 2086 2087 2088 2089 2090 2091 2092 2093 2094 2095 2096 2097 2098 2099 2100 2101 2102 2103 2104 2105 2106 2107 2108 2109 2110 2111 2112 2113 2114 2115 2116 2117 2118 2119 2120 2121 2122 2123 2124 2125 2126 2127 2128 2129 2130 2131 2132 2133 2134
/**
 * ufshcd_dme_set_attr - UIC command for DME_SET, DME_PEER_SET
 * @hba: per adapter instance
 * @attr_sel: uic command argument1
 * @attr_set: attribute set type as uic command argument2
 * @mib_val: setting value as uic command argument3
 * @peer: indicate whether peer or local
 *
 * Returns 0 on success, non-zero value on failure
 */
int ufshcd_dme_set_attr(struct ufs_hba *hba, u32 attr_sel,
			u8 attr_set, u32 mib_val, u8 peer)
{
	struct uic_command uic_cmd = {0};
	static const char *const action[] = {
		"dme-set",
		"dme-peer-set"
	};
	const char *set = action[!!peer];
	int ret;

	uic_cmd.command = peer ?
		UIC_CMD_DME_PEER_SET : UIC_CMD_DME_SET;
	uic_cmd.argument1 = attr_sel;
	uic_cmd.argument2 = UIC_ARG_ATTR_TYPE(attr_set);
	uic_cmd.argument3 = mib_val;

	ret = ufshcd_send_uic_cmd(hba, &uic_cmd);
	if (ret)
		dev_err(hba->dev, "%s: attr-id 0x%x val 0x%x error code %d\n",
			set, UIC_GET_ATTR_ID(attr_sel), mib_val, ret);

	return ret;
}
EXPORT_SYMBOL_GPL(ufshcd_dme_set_attr);

/**
 * ufshcd_dme_get_attr - UIC command for DME_GET, DME_PEER_GET
 * @hba: per adapter instance
 * @attr_sel: uic command argument1
 * @mib_val: the value of the attribute as returned by the UIC command
 * @peer: indicate whether peer or local
 *
 * Returns 0 on success, non-zero value on failure
 */
int ufshcd_dme_get_attr(struct ufs_hba *hba, u32 attr_sel,
			u32 *mib_val, u8 peer)
{
	struct uic_command uic_cmd = {0};
	static const char *const action[] = {
		"dme-get",
		"dme-peer-get"
	};
	const char *get = action[!!peer];
	int ret;

	uic_cmd.command = peer ?
		UIC_CMD_DME_PEER_GET : UIC_CMD_DME_GET;
	uic_cmd.argument1 = attr_sel;

	ret = ufshcd_send_uic_cmd(hba, &uic_cmd);
	if (ret) {
		dev_err(hba->dev, "%s: attr-id 0x%x error code %d\n",
			get, UIC_GET_ATTR_ID(attr_sel), ret);
		goto out;
	}

	if (mib_val)
		*mib_val = uic_cmd.argument3;
out:
	return ret;
}
EXPORT_SYMBOL_GPL(ufshcd_dme_get_attr);

2135
/**
2136 2137 2138
 * ufshcd_uic_pwr_ctrl - executes UIC commands (which affects the link power
 * state) and waits for it to take effect.
 *
2139
 * @hba: per adapter instance
2140 2141 2142 2143 2144 2145 2146 2147
 * @cmd: UIC command to execute
 *
 * DME operations like DME_SET(PA_PWRMODE), DME_HIBERNATE_ENTER &
 * DME_HIBERNATE_EXIT commands take some time to take its effect on both host
 * and device UniPro link and hence it's final completion would be indicated by
 * dedicated status bits in Interrupt Status register (UPMS, UHES, UHXS) in
 * addition to normal UIC command completion Status (UCCS). This function only
 * returns after the relevant status bits indicate the completion.
2148 2149 2150
 *
 * Returns 0 on success, non-zero value on failure
 */
2151
static int ufshcd_uic_pwr_ctrl(struct ufs_hba *hba, struct uic_command *cmd)
2152
{
2153
	struct completion uic_async_done;
2154 2155 2156 2157 2158
	unsigned long flags;
	u8 status;
	int ret;

	mutex_lock(&hba->uic_cmd_mutex);
2159
	init_completion(&uic_async_done);
2160 2161

	spin_lock_irqsave(hba->host->host_lock, flags);
2162 2163
	hba->uic_async_done = &uic_async_done;
	ret = __ufshcd_send_uic_cmd(hba, cmd);
2164 2165 2166
	spin_unlock_irqrestore(hba->host->host_lock, flags);
	if (ret) {
		dev_err(hba->dev,
2167 2168 2169 2170 2171 2172 2173 2174 2175
			"pwr ctrl cmd 0x%x with mode 0x%x uic error %d\n",
			cmd->command, cmd->argument3, ret);
		goto out;
	}
	ret = ufshcd_wait_for_uic_cmd(hba, cmd);
	if (ret) {
		dev_err(hba->dev,
			"pwr ctrl cmd 0x%x with mode 0x%x uic error %d\n",
			cmd->command, cmd->argument3, ret);
2176 2177 2178
		goto out;
	}

2179
	if (!wait_for_completion_timeout(hba->uic_async_done,
2180 2181
					 msecs_to_jiffies(UIC_CMD_TIMEOUT))) {
		dev_err(hba->dev,
2182 2183
			"pwr ctrl cmd 0x%x with mode 0x%x completion timeout\n",
			cmd->command, cmd->argument3);
2184 2185 2186 2187 2188 2189 2190
		ret = -ETIMEDOUT;
		goto out;
	}

	status = ufshcd_get_upmcrs(hba);
	if (status != PWR_LOCAL) {
		dev_err(hba->dev,
2191 2192
			"pwr ctrl cmd 0x%0x failed, host umpcrs:0x%x\n",
			cmd->command, status);
2193 2194 2195 2196
		ret = (status != PWR_OK) ? status : -1;
	}
out:
	spin_lock_irqsave(hba->host->host_lock, flags);
2197
	hba->uic_async_done = NULL;
2198 2199
	spin_unlock_irqrestore(hba->host->host_lock, flags);
	mutex_unlock(&hba->uic_cmd_mutex);
2200

2201 2202 2203
	return ret;
}

2204 2205 2206 2207 2208 2209 2210 2211 2212 2213 2214
/**
 * ufshcd_uic_change_pwr_mode - Perform the UIC power mode chage
 *				using DME_SET primitives.
 * @hba: per adapter instance
 * @mode: powr mode value
 *
 * Returns 0 on success, non-zero value on failure
 */
static int ufshcd_uic_change_pwr_mode(struct ufs_hba *hba, u8 mode)
{
	struct uic_command uic_cmd = {0};
2215
	int ret;
2216 2217 2218 2219

	uic_cmd.command = UIC_CMD_DME_SET;
	uic_cmd.argument1 = UIC_ARG_MIB(PA_PWRMODE);
	uic_cmd.argument3 = mode;
2220 2221 2222
	ufshcd_hold(hba, false);
	ret = ufshcd_uic_pwr_ctrl(hba, &uic_cmd);
	ufshcd_release(hba);
2223

2224
	return ret;
2225 2226 2227 2228 2229 2230 2231 2232 2233 2234 2235 2236 2237 2238 2239 2240 2241 2242 2243 2244 2245 2246 2247 2248 2249 2250
}

static int ufshcd_uic_hibern8_enter(struct ufs_hba *hba)
{
	struct uic_command uic_cmd = {0};

	uic_cmd.command = UIC_CMD_DME_HIBER_ENTER;

	return ufshcd_uic_pwr_ctrl(hba, &uic_cmd);
}

static int ufshcd_uic_hibern8_exit(struct ufs_hba *hba)
{
	struct uic_command uic_cmd = {0};
	int ret;

	uic_cmd.command = UIC_CMD_DME_HIBER_EXIT;
	ret = ufshcd_uic_pwr_ctrl(hba, &uic_cmd);
	if (ret) {
		ufshcd_set_link_off(hba);
		ret = ufshcd_host_reset_and_restore(hba);
	}

	return ret;
}

2251 2252 2253 2254 2255 2256 2257 2258 2259 2260 2261 2262 2263 2264 2265 2266
 /**
 * ufshcd_init_pwr_info - setting the POR (power on reset)
 * values in hba power info
 * @hba: per-adapter instance
 */
static void ufshcd_init_pwr_info(struct ufs_hba *hba)
{
	hba->pwr_info.gear_rx = UFS_PWM_G1;
	hba->pwr_info.gear_tx = UFS_PWM_G1;
	hba->pwr_info.lane_rx = 1;
	hba->pwr_info.lane_tx = 1;
	hba->pwr_info.pwr_rx = SLOWAUTO_MODE;
	hba->pwr_info.pwr_tx = SLOWAUTO_MODE;
	hba->pwr_info.hs_rate = 0;
}

2267
/**
D
Dolev Raviv 已提交
2268 2269
 * ufshcd_get_max_pwr_mode - reads the max power mode negotiated with device
 * @hba: per-adapter instance
2270
 */
D
Dolev Raviv 已提交
2271
static int ufshcd_get_max_pwr_mode(struct ufs_hba *hba)
2272
{
D
Dolev Raviv 已提交
2273 2274 2275 2276 2277 2278 2279 2280
	struct ufs_pa_layer_attr *pwr_info = &hba->max_pwr_info.info;

	if (hba->max_pwr_info.is_valid)
		return 0;

	pwr_info->pwr_tx = FASTAUTO_MODE;
	pwr_info->pwr_rx = FASTAUTO_MODE;
	pwr_info->hs_rate = PA_HS_MODE_B;
2281 2282

	/* Get the connected lane count */
D
Dolev Raviv 已提交
2283 2284 2285 2286 2287 2288 2289 2290 2291 2292 2293 2294
	ufshcd_dme_get(hba, UIC_ARG_MIB(PA_CONNECTEDRXDATALANES),
			&pwr_info->lane_rx);
	ufshcd_dme_get(hba, UIC_ARG_MIB(PA_CONNECTEDTXDATALANES),
			&pwr_info->lane_tx);

	if (!pwr_info->lane_rx || !pwr_info->lane_tx) {
		dev_err(hba->dev, "%s: invalid connected lanes value. rx=%d, tx=%d\n",
				__func__,
				pwr_info->lane_rx,
				pwr_info->lane_tx);
		return -EINVAL;
	}
2295 2296 2297 2298 2299 2300

	/*
	 * First, get the maximum gears of HS speed.
	 * If a zero value, it means there is no HSGEAR capability.
	 * Then, get the maximum gears of PWM speed.
	 */
D
Dolev Raviv 已提交
2301 2302 2303 2304 2305 2306 2307 2308 2309 2310
	ufshcd_dme_get(hba, UIC_ARG_MIB(PA_MAXRXHSGEAR), &pwr_info->gear_rx);
	if (!pwr_info->gear_rx) {
		ufshcd_dme_get(hba, UIC_ARG_MIB(PA_MAXRXPWMGEAR),
				&pwr_info->gear_rx);
		if (!pwr_info->gear_rx) {
			dev_err(hba->dev, "%s: invalid max pwm rx gear read = %d\n",
				__func__, pwr_info->gear_rx);
			return -EINVAL;
		}
		pwr_info->pwr_rx = SLOWAUTO_MODE;
2311 2312
	}

D
Dolev Raviv 已提交
2313 2314 2315
	ufshcd_dme_peer_get(hba, UIC_ARG_MIB(PA_MAXRXHSGEAR),
			&pwr_info->gear_tx);
	if (!pwr_info->gear_tx) {
2316
		ufshcd_dme_peer_get(hba, UIC_ARG_MIB(PA_MAXRXPWMGEAR),
D
Dolev Raviv 已提交
2317 2318 2319 2320 2321 2322 2323 2324 2325 2326 2327 2328 2329 2330 2331 2332 2333 2334 2335 2336 2337 2338 2339 2340 2341 2342 2343 2344
				&pwr_info->gear_tx);
		if (!pwr_info->gear_tx) {
			dev_err(hba->dev, "%s: invalid max pwm tx gear read = %d\n",
				__func__, pwr_info->gear_tx);
			return -EINVAL;
		}
		pwr_info->pwr_tx = SLOWAUTO_MODE;
	}

	hba->max_pwr_info.is_valid = true;
	return 0;
}

static int ufshcd_change_power_mode(struct ufs_hba *hba,
			     struct ufs_pa_layer_attr *pwr_mode)
{
	int ret;

	/* if already configured to the requested pwr_mode */
	if (pwr_mode->gear_rx == hba->pwr_info.gear_rx &&
	    pwr_mode->gear_tx == hba->pwr_info.gear_tx &&
	    pwr_mode->lane_rx == hba->pwr_info.lane_rx &&
	    pwr_mode->lane_tx == hba->pwr_info.lane_tx &&
	    pwr_mode->pwr_rx == hba->pwr_info.pwr_rx &&
	    pwr_mode->pwr_tx == hba->pwr_info.pwr_tx &&
	    pwr_mode->hs_rate == hba->pwr_info.hs_rate) {
		dev_dbg(hba->dev, "%s: power already configured\n", __func__);
		return 0;
2345 2346 2347 2348 2349 2350 2351 2352
	}

	/*
	 * Configure attributes for power mode change with below.
	 * - PA_RXGEAR, PA_ACTIVERXDATALANES, PA_RXTERMINATION,
	 * - PA_TXGEAR, PA_ACTIVETXDATALANES, PA_TXTERMINATION,
	 * - PA_HSSERIES
	 */
D
Dolev Raviv 已提交
2353 2354 2355 2356 2357
	ufshcd_dme_set(hba, UIC_ARG_MIB(PA_RXGEAR), pwr_mode->gear_rx);
	ufshcd_dme_set(hba, UIC_ARG_MIB(PA_ACTIVERXDATALANES),
			pwr_mode->lane_rx);
	if (pwr_mode->pwr_rx == FASTAUTO_MODE ||
			pwr_mode->pwr_rx == FAST_MODE)
2358
		ufshcd_dme_set(hba, UIC_ARG_MIB(PA_RXTERMINATION), TRUE);
D
Dolev Raviv 已提交
2359 2360
	else
		ufshcd_dme_set(hba, UIC_ARG_MIB(PA_RXTERMINATION), FALSE);
2361

D
Dolev Raviv 已提交
2362 2363 2364 2365 2366
	ufshcd_dme_set(hba, UIC_ARG_MIB(PA_TXGEAR), pwr_mode->gear_tx);
	ufshcd_dme_set(hba, UIC_ARG_MIB(PA_ACTIVETXDATALANES),
			pwr_mode->lane_tx);
	if (pwr_mode->pwr_tx == FASTAUTO_MODE ||
			pwr_mode->pwr_tx == FAST_MODE)
2367
		ufshcd_dme_set(hba, UIC_ARG_MIB(PA_TXTERMINATION), TRUE);
D
Dolev Raviv 已提交
2368 2369
	else
		ufshcd_dme_set(hba, UIC_ARG_MIB(PA_TXTERMINATION), FALSE);
2370

D
Dolev Raviv 已提交
2371 2372 2373 2374 2375 2376
	if (pwr_mode->pwr_rx == FASTAUTO_MODE ||
	    pwr_mode->pwr_tx == FASTAUTO_MODE ||
	    pwr_mode->pwr_rx == FAST_MODE ||
	    pwr_mode->pwr_tx == FAST_MODE)
		ufshcd_dme_set(hba, UIC_ARG_MIB(PA_HSSERIES),
						pwr_mode->hs_rate);
2377

D
Dolev Raviv 已提交
2378 2379 2380 2381
	ret = ufshcd_uic_change_pwr_mode(hba, pwr_mode->pwr_rx << 4
			| pwr_mode->pwr_tx);

	if (ret) {
2382
		dev_err(hba->dev,
D
Dolev Raviv 已提交
2383 2384 2385 2386 2387 2388 2389 2390 2391 2392 2393 2394 2395 2396 2397 2398 2399 2400 2401 2402 2403 2404 2405 2406 2407 2408 2409 2410 2411 2412 2413
			"%s: power mode change failed %d\n", __func__, ret);
	} else {
		if (hba->vops && hba->vops->pwr_change_notify)
			hba->vops->pwr_change_notify(hba,
				POST_CHANGE, NULL, pwr_mode);

		memcpy(&hba->pwr_info, pwr_mode,
			sizeof(struct ufs_pa_layer_attr));
	}

	return ret;
}

/**
 * ufshcd_config_pwr_mode - configure a new power mode
 * @hba: per-adapter instance
 * @desired_pwr_mode: desired power configuration
 */
static int ufshcd_config_pwr_mode(struct ufs_hba *hba,
		struct ufs_pa_layer_attr *desired_pwr_mode)
{
	struct ufs_pa_layer_attr final_params = { 0 };
	int ret;

	if (hba->vops && hba->vops->pwr_change_notify)
		hba->vops->pwr_change_notify(hba,
		     PRE_CHANGE, desired_pwr_mode, &final_params);
	else
		memcpy(&final_params, desired_pwr_mode, sizeof(final_params));

	ret = ufshcd_change_power_mode(hba, &final_params);
2414 2415 2416 2417

	return ret;
}

2418 2419 2420 2421 2422 2423 2424 2425 2426 2427 2428 2429 2430 2431 2432 2433 2434 2435 2436 2437 2438 2439 2440 2441 2442 2443 2444 2445 2446 2447 2448 2449 2450 2451 2452 2453 2454 2455 2456 2457 2458 2459 2460 2461 2462 2463 2464 2465 2466 2467 2468
/**
 * ufshcd_complete_dev_init() - checks device readiness
 * hba: per-adapter instance
 *
 * Set fDeviceInit flag and poll until device toggles it.
 */
static int ufshcd_complete_dev_init(struct ufs_hba *hba)
{
	int i, retries, err = 0;
	bool flag_res = 1;

	for (retries = QUERY_REQ_RETRIES; retries > 0; retries--) {
		/* Set the fDeviceInit flag */
		err = ufshcd_query_flag(hba, UPIU_QUERY_OPCODE_SET_FLAG,
					QUERY_FLAG_IDN_FDEVICEINIT, NULL);
		if (!err || err == -ETIMEDOUT)
			break;
		dev_dbg(hba->dev, "%s: error %d retrying\n", __func__, err);
	}
	if (err) {
		dev_err(hba->dev,
			"%s setting fDeviceInit flag failed with error %d\n",
			__func__, err);
		goto out;
	}

	/* poll for max. 100 iterations for fDeviceInit flag to clear */
	for (i = 0; i < 100 && !err && flag_res; i++) {
		for (retries = QUERY_REQ_RETRIES; retries > 0; retries--) {
			err = ufshcd_query_flag(hba,
					UPIU_QUERY_OPCODE_READ_FLAG,
					QUERY_FLAG_IDN_FDEVICEINIT, &flag_res);
			if (!err || err == -ETIMEDOUT)
				break;
			dev_dbg(hba->dev, "%s: error %d retrying\n", __func__,
					err);
		}
	}
	if (err)
		dev_err(hba->dev,
			"%s reading fDeviceInit flag failed with error %d\n",
			__func__, err);
	else if (flag_res)
		dev_err(hba->dev,
			"%s fDeviceInit was not cleared by the device\n",
			__func__);

out:
	return err;
}

2469 2470 2471 2472 2473
/**
 * ufshcd_make_hba_operational - Make UFS controller operational
 * @hba: per adapter instance
 *
 * To bring UFS host controller to operational state,
2474 2475 2476 2477
 * 1. Enable required interrupts
 * 2. Configure interrupt aggregation
 * 3. Program UTRL and UTMRL base addres
 * 4. Configure run-stop-registers
2478 2479 2480 2481 2482 2483 2484 2485
 *
 * Returns 0 on success, non-zero value on failure
 */
static int ufshcd_make_hba_operational(struct ufs_hba *hba)
{
	int err = 0;
	u32 reg;

2486 2487 2488 2489
	/* Enable required interrupts */
	ufshcd_enable_intr(hba, UFSHCD_ENABLE_INTRS);

	/* Configure interrupt aggregation */
2490
	ufshcd_config_intr_aggr(hba, hba->nutrs - 1, INT_AGGR_DEF_TO);
2491 2492 2493 2494 2495 2496 2497 2498 2499 2500 2501

	/* Configure UTRL and UTMRL base address registers */
	ufshcd_writel(hba, lower_32_bits(hba->utrdl_dma_addr),
			REG_UTP_TRANSFER_REQ_LIST_BASE_L);
	ufshcd_writel(hba, upper_32_bits(hba->utrdl_dma_addr),
			REG_UTP_TRANSFER_REQ_LIST_BASE_H);
	ufshcd_writel(hba, lower_32_bits(hba->utmrdl_dma_addr),
			REG_UTP_TASK_REQ_LIST_BASE_L);
	ufshcd_writel(hba, upper_32_bits(hba->utmrdl_dma_addr),
			REG_UTP_TASK_REQ_LIST_BASE_H);

2502 2503 2504 2505
	/*
	 * UCRDY, UTMRLDY and UTRLRDY bits must be 1
	 * DEI, HEI bits must be 0
	 */
2506
	reg = ufshcd_readl(hba, REG_CONTROLLER_STATUS);
2507 2508 2509
	if (!(ufshcd_get_lists_status(reg))) {
		ufshcd_enable_run_stop_reg(hba);
	} else {
2510
		dev_err(hba->dev,
2511 2512 2513 2514 2515 2516 2517 2518 2519 2520 2521 2522 2523 2524 2525 2526 2527 2528 2529 2530 2531 2532 2533 2534 2535 2536 2537 2538 2539 2540 2541 2542 2543 2544 2545 2546 2547 2548 2549 2550 2551 2552
			"Host controller not ready to process requests");
		err = -EIO;
		goto out;
	}

out:
	return err;
}

/**
 * ufshcd_hba_enable - initialize the controller
 * @hba: per adapter instance
 *
 * The controller resets itself and controller firmware initialization
 * sequence kicks off. When controller is ready it will set
 * the Host Controller Enable bit to 1.
 *
 * Returns 0 on success, non-zero value on failure
 */
static int ufshcd_hba_enable(struct ufs_hba *hba)
{
	int retry;

	/*
	 * msleep of 1 and 5 used in this function might result in msleep(20),
	 * but it was necessary to send the UFS FPGA to reset mode during
	 * development and testing of this driver. msleep can be changed to
	 * mdelay and retry count can be reduced based on the controller.
	 */
	if (!ufshcd_is_hba_active(hba)) {

		/* change controller state to "reset state" */
		ufshcd_hba_stop(hba);

		/*
		 * This delay is based on the testing done with UFS host
		 * controller FPGA. The delay can be changed based on the
		 * host controller used.
		 */
		msleep(5);
	}

2553 2554 2555
	/* UniPro link is disabled at this point */
	ufshcd_set_link_off(hba);

2556 2557 2558
	if (hba->vops && hba->vops->hce_enable_notify)
		hba->vops->hce_enable_notify(hba, PRE_CHANGE);

2559 2560 2561 2562 2563 2564 2565 2566 2567 2568 2569 2570 2571 2572 2573 2574 2575 2576 2577 2578 2579
	/* start controller initialization sequence */
	ufshcd_hba_start(hba);

	/*
	 * To initialize a UFS host controller HCE bit must be set to 1.
	 * During initialization the HCE bit value changes from 1->0->1.
	 * When the host controller completes initialization sequence
	 * it sets the value of HCE bit to 1. The same HCE bit is read back
	 * to check if the controller has completed initialization sequence.
	 * So without this delay the value HCE = 1, set in the previous
	 * instruction might be read back.
	 * This delay can be changed based on the controller.
	 */
	msleep(1);

	/* wait for the host controller to complete initialization */
	retry = 10;
	while (ufshcd_is_hba_active(hba)) {
		if (retry) {
			retry--;
		} else {
2580
			dev_err(hba->dev,
2581 2582 2583 2584 2585
				"Controller enable failed\n");
			return -EIO;
		}
		msleep(5);
	}
2586

S
Sujit Reddy Thumma 已提交
2587
	/* enable UIC related interrupts */
2588
	ufshcd_enable_intr(hba, UFSHCD_UIC_MASK);
S
Sujit Reddy Thumma 已提交
2589

2590 2591 2592
	if (hba->vops && hba->vops->hce_enable_notify)
		hba->vops->hce_enable_notify(hba, POST_CHANGE);

2593 2594 2595 2596
	return 0;
}

/**
2597
 * ufshcd_link_startup - Initialize unipro link startup
2598 2599
 * @hba: per adapter instance
 *
2600
 * Returns 0 for success, non-zero in case of failure
2601
 */
2602
static int ufshcd_link_startup(struct ufs_hba *hba)
2603
{
2604
	int ret;
S
Sujit Reddy Thumma 已提交
2605
	int retries = DME_LINKSTARTUP_RETRIES;
2606

S
Sujit Reddy Thumma 已提交
2607 2608 2609
	do {
		if (hba->vops && hba->vops->link_startup_notify)
			hba->vops->link_startup_notify(hba, PRE_CHANGE);
2610

S
Sujit Reddy Thumma 已提交
2611
		ret = ufshcd_dme_link_startup(hba);
2612

S
Sujit Reddy Thumma 已提交
2613 2614 2615 2616 2617 2618
		/* check if device is detected by inter-connect layer */
		if (!ret && !ufshcd_is_device_present(hba)) {
			dev_err(hba->dev, "%s: Device not present\n", __func__);
			ret = -ENXIO;
			goto out;
		}
2619

S
Sujit Reddy Thumma 已提交
2620 2621 2622 2623 2624 2625 2626 2627 2628 2629 2630
		/*
		 * DME link lost indication is only received when link is up,
		 * but we can't be sure if the link is up until link startup
		 * succeeds. So reset the local Uni-Pro and try again.
		 */
		if (ret && ufshcd_hba_enable(hba))
			goto out;
	} while (ret && retries--);

	if (ret)
		/* failed to get the link up... retire */
2631 2632 2633 2634 2635 2636 2637 2638
		goto out;

	/* Include any host controller configuration via UIC commands */
	if (hba->vops && hba->vops->link_startup_notify) {
		ret = hba->vops->link_startup_notify(hba, POST_CHANGE);
		if (ret)
			goto out;
	}
2639

2640
	ret = ufshcd_make_hba_operational(hba);
2641 2642 2643 2644
out:
	if (ret)
		dev_err(hba->dev, "link startup failed %d\n", ret);
	return ret;
2645 2646
}

2647 2648 2649 2650 2651 2652 2653 2654 2655 2656 2657 2658 2659 2660 2661
/**
 * ufshcd_verify_dev_init() - Verify device initialization
 * @hba: per-adapter instance
 *
 * Send NOP OUT UPIU and wait for NOP IN response to check whether the
 * device Transport Protocol (UTP) layer is ready after a reset.
 * If the UTP layer at the device side is not initialized, it may
 * not respond with NOP IN UPIU within timeout of %NOP_OUT_TIMEOUT
 * and we retry sending NOP OUT for %NOP_OUT_RETRIES iterations.
 */
static int ufshcd_verify_dev_init(struct ufs_hba *hba)
{
	int err = 0;
	int retries;

2662
	ufshcd_hold(hba, false);
2663 2664 2665 2666 2667 2668 2669 2670 2671 2672 2673
	mutex_lock(&hba->dev_cmd.lock);
	for (retries = NOP_OUT_RETRIES; retries > 0; retries--) {
		err = ufshcd_exec_dev_cmd(hba, DEV_CMD_TYPE_NOP,
					       NOP_OUT_TIMEOUT);

		if (!err || err == -ETIMEDOUT)
			break;

		dev_dbg(hba->dev, "%s: error %d retrying\n", __func__, err);
	}
	mutex_unlock(&hba->dev_cmd.lock);
2674
	ufshcd_release(hba);
2675 2676 2677 2678 2679 2680

	if (err)
		dev_err(hba->dev, "%s: NOP OUT failed %d\n", __func__, err);
	return err;
}

2681 2682 2683 2684 2685 2686 2687 2688 2689 2690 2691 2692 2693 2694 2695 2696 2697 2698 2699 2700 2701 2702 2703 2704 2705 2706 2707 2708 2709 2710 2711 2712 2713 2714 2715
/**
 * ufshcd_set_queue_depth - set lun queue depth
 * @sdev: pointer to SCSI device
 *
 * Read bLUQueueDepth value and activate scsi tagged command
 * queueing. For WLUN, queue depth is set to 1. For best-effort
 * cases (bLUQueueDepth = 0) the queue depth is set to a maximum
 * value that host can queue.
 */
static void ufshcd_set_queue_depth(struct scsi_device *sdev)
{
	int ret = 0;
	u8 lun_qdepth;
	struct ufs_hba *hba;

	hba = shost_priv(sdev->host);

	lun_qdepth = hba->nutrs;
	ret = ufshcd_read_unit_desc_param(hba,
					  ufshcd_scsi_to_upiu_lun(sdev->lun),
					  UNIT_DESC_PARAM_LU_Q_DEPTH,
					  &lun_qdepth,
					  sizeof(lun_qdepth));

	/* Some WLUN doesn't support unit descriptor */
	if (ret == -EOPNOTSUPP)
		lun_qdepth = 1;
	else if (!lun_qdepth)
		/* eventually, we can figure out the real queue depth */
		lun_qdepth = hba->nutrs;
	else
		lun_qdepth = min_t(int, lun_qdepth, hba->nutrs);

	dev_dbg(hba->dev, "%s: activate tcq with queue depth %d\n",
			__func__, lun_qdepth);
2716
	scsi_change_queue_depth(sdev, lun_qdepth);
2717 2718
}

2719 2720 2721 2722 2723 2724 2725 2726 2727 2728 2729 2730 2731 2732 2733 2734 2735 2736 2737 2738 2739 2740 2741 2742 2743 2744 2745 2746 2747 2748 2749 2750 2751 2752 2753 2754 2755 2756 2757 2758 2759 2760 2761 2762 2763 2764 2765 2766 2767 2768 2769 2770 2771 2772 2773 2774
/*
 * ufshcd_get_lu_wp - returns the "b_lu_write_protect" from UNIT DESCRIPTOR
 * @hba: per-adapter instance
 * @lun: UFS device lun id
 * @b_lu_write_protect: pointer to buffer to hold the LU's write protect info
 *
 * Returns 0 in case of success and b_lu_write_protect status would be returned
 * @b_lu_write_protect parameter.
 * Returns -ENOTSUPP if reading b_lu_write_protect is not supported.
 * Returns -EINVAL in case of invalid parameters passed to this function.
 */
static int ufshcd_get_lu_wp(struct ufs_hba *hba,
			    u8 lun,
			    u8 *b_lu_write_protect)
{
	int ret;

	if (!b_lu_write_protect)
		ret = -EINVAL;
	/*
	 * According to UFS device spec, RPMB LU can't be write
	 * protected so skip reading bLUWriteProtect parameter for
	 * it. For other W-LUs, UNIT DESCRIPTOR is not available.
	 */
	else if (lun >= UFS_UPIU_MAX_GENERAL_LUN)
		ret = -ENOTSUPP;
	else
		ret = ufshcd_read_unit_desc_param(hba,
					  lun,
					  UNIT_DESC_PARAM_LU_WR_PROTECT,
					  b_lu_write_protect,
					  sizeof(*b_lu_write_protect));
	return ret;
}

/**
 * ufshcd_get_lu_power_on_wp_status - get LU's power on write protect
 * status
 * @hba: per-adapter instance
 * @sdev: pointer to SCSI device
 *
 */
static inline void ufshcd_get_lu_power_on_wp_status(struct ufs_hba *hba,
						    struct scsi_device *sdev)
{
	if (hba->dev_info.f_power_on_wp_en &&
	    !hba->dev_info.is_lu_power_on_wp) {
		u8 b_lu_write_protect;

		if (!ufshcd_get_lu_wp(hba, ufshcd_scsi_to_upiu_lun(sdev->lun),
				      &b_lu_write_protect) &&
		    (b_lu_write_protect == UFS_LU_POWER_ON_WP))
			hba->dev_info.is_lu_power_on_wp = true;
	}
}

2775 2776 2777 2778 2779 2780 2781 2782 2783 2784 2785 2786 2787 2788 2789
/**
 * ufshcd_slave_alloc - handle initial SCSI device configurations
 * @sdev: pointer to SCSI device
 *
 * Returns success
 */
static int ufshcd_slave_alloc(struct scsi_device *sdev)
{
	struct ufs_hba *hba;

	hba = shost_priv(sdev->host);

	/* Mode sense(6) is not supported by UFS, so use Mode sense(10) */
	sdev->use_10_for_ms = 1;

2790 2791
	/* allow SCSI layer to restart the device in case of errors */
	sdev->allow_restart = 1;
2792

2793 2794 2795
	/* REPORT SUPPORTED OPERATION CODES is not supported */
	sdev->no_report_opcodes = 1;

2796

2797
	ufshcd_set_queue_depth(sdev);
2798

2799 2800
	ufshcd_get_lu_power_on_wp_status(hba, sdev);

2801 2802 2803
	return 0;
}

2804 2805 2806 2807 2808
/**
 * ufshcd_change_queue_depth - change queue depth
 * @sdev: pointer to SCSI device
 * @depth: required depth to set
 *
2809
 * Change queue depth and make sure the max. limits are not crossed.
2810
 */
2811
static int ufshcd_change_queue_depth(struct scsi_device *sdev, int depth)
2812 2813 2814 2815 2816
{
	struct ufs_hba *hba = shost_priv(sdev->host);

	if (depth > hba->nutrs)
		depth = hba->nutrs;
2817
	return scsi_change_queue_depth(sdev, depth);
2818 2819
}

2820 2821 2822 2823 2824 2825 2826 2827 2828 2829 2830 2831 2832 2833
/**
 * ufshcd_slave_configure - adjust SCSI device configurations
 * @sdev: pointer to SCSI device
 */
static int ufshcd_slave_configure(struct scsi_device *sdev)
{
	struct request_queue *q = sdev->request_queue;

	blk_queue_update_dma_pad(q, PRDT_DATA_BYTE_COUNT_PAD - 1);
	blk_queue_max_segment_size(q, PRDT_DATA_BYTE_COUNT_MAX);

	return 0;
}

2834 2835 2836 2837 2838 2839 2840 2841 2842
/**
 * ufshcd_slave_destroy - remove SCSI device configurations
 * @sdev: pointer to SCSI device
 */
static void ufshcd_slave_destroy(struct scsi_device *sdev)
{
	struct ufs_hba *hba;

	hba = shost_priv(sdev->host);
2843
	/* Drop the reference as it won't be needed anymore */
2844 2845 2846 2847
	if (ufshcd_scsi_to_upiu_lun(sdev->lun) == UFS_UPIU_UFS_DEVICE_WLUN) {
		unsigned long flags;

		spin_lock_irqsave(hba->host->host_lock, flags);
2848
		hba->sdev_ufs_device = NULL;
2849 2850
		spin_unlock_irqrestore(hba->host->host_lock, flags);
	}
2851 2852 2853 2854 2855 2856
}

/**
 * ufshcd_task_req_compl - handle task management request completion
 * @hba: per adapter instance
 * @index: index of the completed request
2857
 * @resp: task management service response
2858
 *
2859
 * Returns non-zero value on error, zero on success
2860
 */
2861
static int ufshcd_task_req_compl(struct ufs_hba *hba, u32 index, u8 *resp)
2862 2863 2864 2865 2866 2867 2868 2869 2870 2871 2872 2873 2874 2875 2876 2877 2878 2879 2880 2881
{
	struct utp_task_req_desc *task_req_descp;
	struct utp_upiu_task_rsp *task_rsp_upiup;
	unsigned long flags;
	int ocs_value;
	int task_result;

	spin_lock_irqsave(hba->host->host_lock, flags);

	/* Clear completed tasks from outstanding_tasks */
	__clear_bit(index, &hba->outstanding_tasks);

	task_req_descp = hba->utmrdl_base_addr;
	ocs_value = ufshcd_get_tmr_ocs(&task_req_descp[index]);

	if (ocs_value == OCS_SUCCESS) {
		task_rsp_upiup = (struct utp_upiu_task_rsp *)
				task_req_descp[index].task_rsp_upiu;
		task_result = be32_to_cpu(task_rsp_upiup->header.dword_1);
		task_result = ((task_result & MASK_TASK_RESPONSE) >> 8);
2882 2883
		if (resp)
			*resp = (u8)task_result;
2884
	} else {
2885 2886
		dev_err(hba->dev, "%s: failed, ocs = 0x%x\n",
				__func__, ocs_value);
2887 2888
	}
	spin_unlock_irqrestore(hba->host->host_lock, flags);
2889 2890

	return ocs_value;
2891 2892 2893 2894 2895 2896 2897 2898 2899 2900 2901 2902 2903 2904 2905 2906
}

/**
 * ufshcd_scsi_cmd_status - Update SCSI command result based on SCSI status
 * @lrb: pointer to local reference block of completed command
 * @scsi_status: SCSI command status
 *
 * Returns value base on SCSI command status
 */
static inline int
ufshcd_scsi_cmd_status(struct ufshcd_lrb *lrbp, int scsi_status)
{
	int result = 0;

	switch (scsi_status) {
	case SAM_STAT_CHECK_CONDITION:
2907 2908
		ufshcd_copy_sense_data(lrbp);
	case SAM_STAT_GOOD:
2909 2910
		result |= DID_OK << 16 |
			  COMMAND_COMPLETE << 8 |
2911
			  scsi_status;
2912 2913
		break;
	case SAM_STAT_TASK_SET_FULL:
2914
	case SAM_STAT_BUSY:
2915
	case SAM_STAT_TASK_ABORTED:
2916 2917
		ufshcd_copy_sense_data(lrbp);
		result |= scsi_status;
2918 2919 2920 2921 2922 2923 2924 2925 2926 2927 2928 2929 2930 2931 2932 2933 2934 2935 2936 2937 2938 2939 2940 2941 2942 2943 2944 2945
		break;
	default:
		result |= DID_ERROR << 16;
		break;
	} /* end of switch */

	return result;
}

/**
 * ufshcd_transfer_rsp_status - Get overall status of the response
 * @hba: per adapter instance
 * @lrb: pointer to local reference block of completed command
 *
 * Returns result of the command to notify SCSI midlayer
 */
static inline int
ufshcd_transfer_rsp_status(struct ufs_hba *hba, struct ufshcd_lrb *lrbp)
{
	int result = 0;
	int scsi_status;
	int ocs;

	/* overall command status of utrd */
	ocs = ufshcd_get_tr_ocs(lrbp);

	switch (ocs) {
	case OCS_SUCCESS:
2946
		result = ufshcd_get_req_rsp(lrbp->ucd_rsp_ptr);
2947

2948 2949 2950 2951 2952 2953 2954 2955 2956 2957 2958 2959 2960 2961
		switch (result) {
		case UPIU_TRANSACTION_RESPONSE:
			/*
			 * get the response UPIU result to extract
			 * the SCSI command status
			 */
			result = ufshcd_get_rsp_upiu_result(lrbp->ucd_rsp_ptr);

			/*
			 * get the result based on SCSI status response
			 * to notify the SCSI midlayer of the command status
			 */
			scsi_status = result & MASK_SCSI_STATUS;
			result = ufshcd_scsi_cmd_status(lrbp, scsi_status);
2962 2963 2964

			if (ufshcd_is_exception_event(lrbp->ucd_rsp_ptr))
				schedule_work(&hba->eeh_work);
2965 2966 2967 2968
			break;
		case UPIU_TRANSACTION_REJECT_UPIU:
			/* TODO: handle Reject UPIU Response */
			result = DID_ERROR << 16;
2969
			dev_err(hba->dev,
2970 2971 2972 2973 2974 2975 2976
				"Reject UPIU not fully implemented\n");
			break;
		default:
			result = DID_ERROR << 16;
			dev_err(hba->dev,
				"Unexpected request response code = %x\n",
				result);
2977 2978 2979 2980 2981 2982
			break;
		}
		break;
	case OCS_ABORTED:
		result |= DID_ABORT << 16;
		break;
2983 2984 2985
	case OCS_INVALID_COMMAND_STATUS:
		result |= DID_REQUEUE << 16;
		break;
2986 2987 2988 2989 2990 2991 2992 2993
	case OCS_INVALID_CMD_TABLE_ATTR:
	case OCS_INVALID_PRDT_ATTR:
	case OCS_MISMATCH_DATA_BUF_SIZE:
	case OCS_MISMATCH_RESP_UPIU_SIZE:
	case OCS_PEER_COMM_FAILURE:
	case OCS_FATAL_ERROR:
	default:
		result |= DID_ERROR << 16;
2994
		dev_err(hba->dev,
2995 2996 2997 2998 2999 3000 3001
		"OCS error from controller = %x\n", ocs);
		break;
	} /* end of switch */

	return result;
}

3002 3003 3004
/**
 * ufshcd_uic_cmd_compl - handle completion of uic command
 * @hba: per adapter instance
3005
 * @intr_status: interrupt status generated by the controller
3006
 */
3007
static void ufshcd_uic_cmd_compl(struct ufs_hba *hba, u32 intr_status)
3008
{
3009
	if ((intr_status & UIC_COMMAND_COMPL) && hba->active_uic_cmd) {
3010 3011
		hba->active_uic_cmd->argument2 |=
			ufshcd_get_uic_cmd_result(hba);
3012 3013
		hba->active_uic_cmd->argument3 =
			ufshcd_get_dme_attr_val(hba);
3014 3015
		complete(&hba->active_uic_cmd->done);
	}
3016

3017 3018
	if ((intr_status & UFSHCD_UIC_PWR_MASK) && hba->uic_async_done)
		complete(hba->uic_async_done);
3019 3020
}

3021 3022 3023 3024 3025 3026
/**
 * ufshcd_transfer_req_compl - handle SCSI and query command completion
 * @hba: per adapter instance
 */
static void ufshcd_transfer_req_compl(struct ufs_hba *hba)
{
3027 3028
	struct ufshcd_lrb *lrbp;
	struct scsi_cmnd *cmd;
3029 3030 3031 3032
	unsigned long completed_reqs;
	u32 tr_doorbell;
	int result;
	int index;
3033 3034 3035 3036 3037 3038 3039 3040 3041

	/* Resetting interrupt aggregation counters first and reading the
	 * DOOR_BELL afterward allows us to handle all the completed requests.
	 * In order to prevent other interrupts starvation the DB is read once
	 * after reset. The down side of this solution is the possibility of
	 * false interrupt if device completes another request after resetting
	 * aggregation and before reading the DB.
	 */
	ufshcd_reset_intr_aggr(hba);
3042

3043
	tr_doorbell = ufshcd_readl(hba, REG_UTP_TRANSFER_REQ_DOOR_BELL);
3044 3045
	completed_reqs = tr_doorbell ^ hba->outstanding_reqs;

3046 3047 3048 3049 3050 3051 3052 3053 3054 3055 3056 3057
	for_each_set_bit(index, &completed_reqs, hba->nutrs) {
		lrbp = &hba->lrb[index];
		cmd = lrbp->cmd;
		if (cmd) {
			result = ufshcd_transfer_rsp_status(hba, lrbp);
			scsi_dma_unmap(cmd);
			cmd->result = result;
			/* Mark completed command as NULL in LRB */
			lrbp->cmd = NULL;
			clear_bit_unlock(index, &hba->lrb_in_use);
			/* Do not touch lrbp after scsi done */
			cmd->scsi_done(cmd);
3058
			__ufshcd_release(hba);
3059 3060 3061 3062 3063
		} else if (lrbp->command_type == UTP_CMD_TYPE_DEV_MANAGE) {
			if (hba->dev_cmd.complete)
				complete(hba->dev_cmd.complete);
		}
	}
3064 3065 3066 3067

	/* clear corresponding bits of completed commands */
	hba->outstanding_reqs ^= completed_reqs;

3068 3069
	ufshcd_clk_scaling_update_busy(hba);

3070 3071
	/* we might have free'd some tags above */
	wake_up(&hba->dev_cmd.tag_wq);
3072 3073
}

3074 3075 3076 3077 3078 3079 3080 3081 3082 3083 3084 3085 3086 3087 3088 3089 3090 3091 3092 3093 3094 3095 3096 3097 3098 3099 3100 3101 3102 3103 3104 3105 3106 3107 3108 3109 3110 3111 3112 3113 3114 3115 3116 3117 3118 3119 3120 3121 3122 3123 3124 3125 3126 3127 3128 3129 3130 3131 3132 3133 3134 3135 3136 3137 3138 3139 3140 3141 3142 3143 3144 3145 3146 3147 3148 3149 3150 3151 3152 3153 3154 3155 3156 3157 3158 3159 3160 3161 3162 3163 3164 3165 3166 3167 3168 3169 3170 3171 3172 3173 3174 3175 3176 3177 3178 3179 3180 3181 3182 3183 3184 3185 3186 3187 3188 3189 3190 3191 3192 3193 3194 3195 3196 3197 3198 3199 3200 3201 3202 3203 3204 3205 3206 3207 3208 3209 3210 3211 3212 3213 3214 3215 3216 3217 3218 3219 3220 3221 3222 3223 3224 3225 3226 3227 3228 3229 3230 3231 3232
/**
 * ufshcd_disable_ee - disable exception event
 * @hba: per-adapter instance
 * @mask: exception event to disable
 *
 * Disables exception event in the device so that the EVENT_ALERT
 * bit is not set.
 *
 * Returns zero on success, non-zero error value on failure.
 */
static int ufshcd_disable_ee(struct ufs_hba *hba, u16 mask)
{
	int err = 0;
	u32 val;

	if (!(hba->ee_ctrl_mask & mask))
		goto out;

	val = hba->ee_ctrl_mask & ~mask;
	val &= 0xFFFF; /* 2 bytes */
	err = ufshcd_query_attr(hba, UPIU_QUERY_OPCODE_WRITE_ATTR,
			QUERY_ATTR_IDN_EE_CONTROL, 0, 0, &val);
	if (!err)
		hba->ee_ctrl_mask &= ~mask;
out:
	return err;
}

/**
 * ufshcd_enable_ee - enable exception event
 * @hba: per-adapter instance
 * @mask: exception event to enable
 *
 * Enable corresponding exception event in the device to allow
 * device to alert host in critical scenarios.
 *
 * Returns zero on success, non-zero error value on failure.
 */
static int ufshcd_enable_ee(struct ufs_hba *hba, u16 mask)
{
	int err = 0;
	u32 val;

	if (hba->ee_ctrl_mask & mask)
		goto out;

	val = hba->ee_ctrl_mask | mask;
	val &= 0xFFFF; /* 2 bytes */
	err = ufshcd_query_attr(hba, UPIU_QUERY_OPCODE_WRITE_ATTR,
			QUERY_ATTR_IDN_EE_CONTROL, 0, 0, &val);
	if (!err)
		hba->ee_ctrl_mask |= mask;
out:
	return err;
}

/**
 * ufshcd_enable_auto_bkops - Allow device managed BKOPS
 * @hba: per-adapter instance
 *
 * Allow device to manage background operations on its own. Enabling
 * this might lead to inconsistent latencies during normal data transfers
 * as the device is allowed to manage its own way of handling background
 * operations.
 *
 * Returns zero on success, non-zero on failure.
 */
static int ufshcd_enable_auto_bkops(struct ufs_hba *hba)
{
	int err = 0;

	if (hba->auto_bkops_enabled)
		goto out;

	err = ufshcd_query_flag(hba, UPIU_QUERY_OPCODE_SET_FLAG,
			QUERY_FLAG_IDN_BKOPS_EN, NULL);
	if (err) {
		dev_err(hba->dev, "%s: failed to enable bkops %d\n",
				__func__, err);
		goto out;
	}

	hba->auto_bkops_enabled = true;

	/* No need of URGENT_BKOPS exception from the device */
	err = ufshcd_disable_ee(hba, MASK_EE_URGENT_BKOPS);
	if (err)
		dev_err(hba->dev, "%s: failed to disable exception event %d\n",
				__func__, err);
out:
	return err;
}

/**
 * ufshcd_disable_auto_bkops - block device in doing background operations
 * @hba: per-adapter instance
 *
 * Disabling background operations improves command response latency but
 * has drawback of device moving into critical state where the device is
 * not-operable. Make sure to call ufshcd_enable_auto_bkops() whenever the
 * host is idle so that BKOPS are managed effectively without any negative
 * impacts.
 *
 * Returns zero on success, non-zero on failure.
 */
static int ufshcd_disable_auto_bkops(struct ufs_hba *hba)
{
	int err = 0;

	if (!hba->auto_bkops_enabled)
		goto out;

	/*
	 * If host assisted BKOPs is to be enabled, make sure
	 * urgent bkops exception is allowed.
	 */
	err = ufshcd_enable_ee(hba, MASK_EE_URGENT_BKOPS);
	if (err) {
		dev_err(hba->dev, "%s: failed to enable exception event %d\n",
				__func__, err);
		goto out;
	}

	err = ufshcd_query_flag(hba, UPIU_QUERY_OPCODE_CLEAR_FLAG,
			QUERY_FLAG_IDN_BKOPS_EN, NULL);
	if (err) {
		dev_err(hba->dev, "%s: failed to disable bkops %d\n",
				__func__, err);
		ufshcd_disable_ee(hba, MASK_EE_URGENT_BKOPS);
		goto out;
	}

	hba->auto_bkops_enabled = false;
out:
	return err;
}

/**
 * ufshcd_force_reset_auto_bkops - force enable of auto bkops
 * @hba: per adapter instance
 *
 * After a device reset the device may toggle the BKOPS_EN flag
 * to default value. The s/w tracking variables should be updated
 * as well. Do this by forcing enable of auto bkops.
 */
static void  ufshcd_force_reset_auto_bkops(struct ufs_hba *hba)
{
	hba->auto_bkops_enabled = false;
	hba->ee_ctrl_mask |= MASK_EE_URGENT_BKOPS;
	ufshcd_enable_auto_bkops(hba);
}

static inline int ufshcd_get_bkops_status(struct ufs_hba *hba, u32 *status)
{
	return ufshcd_query_attr(hba, UPIU_QUERY_OPCODE_READ_ATTR,
			QUERY_ATTR_IDN_BKOPS_STATUS, 0, 0, status);
}

/**
3233
 * ufshcd_bkops_ctrl - control the auto bkops based on current bkops status
3234
 * @hba: per-adapter instance
3235
 * @status: bkops_status value
3236
 *
3237 3238 3239 3240 3241 3242 3243 3244 3245 3246
 * Read the bkops_status from the UFS device and Enable fBackgroundOpsEn
 * flag in the device to permit background operations if the device
 * bkops_status is greater than or equal to "status" argument passed to
 * this function, disable otherwise.
 *
 * Returns 0 for success, non-zero in case of failure.
 *
 * NOTE: Caller of this function can check the "hba->auto_bkops_enabled" flag
 * to know whether auto bkops is enabled or disabled after this function
 * returns control to it.
3247
 */
3248 3249
static int ufshcd_bkops_ctrl(struct ufs_hba *hba,
			     enum bkops_status status)
3250 3251
{
	int err;
3252
	u32 curr_status = 0;
3253

3254
	err = ufshcd_get_bkops_status(hba, &curr_status);
3255 3256 3257 3258
	if (err) {
		dev_err(hba->dev, "%s: failed to get BKOPS status %d\n",
				__func__, err);
		goto out;
3259 3260 3261 3262 3263
	} else if (curr_status > BKOPS_STATUS_MAX) {
		dev_err(hba->dev, "%s: invalid BKOPS status %d\n",
				__func__, curr_status);
		err = -EINVAL;
		goto out;
3264 3265
	}

3266
	if (curr_status >= status)
3267
		err = ufshcd_enable_auto_bkops(hba);
3268 3269
	else
		err = ufshcd_disable_auto_bkops(hba);
3270 3271 3272 3273
out:
	return err;
}

3274 3275 3276 3277 3278 3279 3280 3281 3282 3283 3284 3285 3286 3287 3288
/**
 * ufshcd_urgent_bkops - handle urgent bkops exception event
 * @hba: per-adapter instance
 *
 * Enable fBackgroundOpsEn flag in the device to permit background
 * operations.
 *
 * If BKOPs is enabled, this function returns 0, 1 if the bkops in not enabled
 * and negative error value for any other failure.
 */
static int ufshcd_urgent_bkops(struct ufs_hba *hba)
{
	return ufshcd_bkops_ctrl(hba, BKOPS_STATUS_PERF_IMPACT);
}

3289 3290 3291 3292 3293 3294 3295 3296 3297 3298 3299 3300 3301 3302 3303 3304 3305 3306 3307 3308
static inline int ufshcd_get_ee_status(struct ufs_hba *hba, u32 *status)
{
	return ufshcd_query_attr(hba, UPIU_QUERY_OPCODE_READ_ATTR,
			QUERY_ATTR_IDN_EE_STATUS, 0, 0, status);
}

/**
 * ufshcd_exception_event_handler - handle exceptions raised by device
 * @work: pointer to work data
 *
 * Read bExceptionEventStatus attribute from the device and handle the
 * exception event accordingly.
 */
static void ufshcd_exception_event_handler(struct work_struct *work)
{
	struct ufs_hba *hba;
	int err;
	u32 status = 0;
	hba = container_of(work, struct ufs_hba, eeh_work);

3309
	pm_runtime_get_sync(hba->dev);
3310 3311 3312 3313 3314 3315 3316 3317 3318 3319
	err = ufshcd_get_ee_status(hba, &status);
	if (err) {
		dev_err(hba->dev, "%s: failed to get exception status %d\n",
				__func__, err);
		goto out;
	}

	status &= hba->ee_ctrl_mask;
	if (status & MASK_EE_URGENT_BKOPS) {
		err = ufshcd_urgent_bkops(hba);
3320
		if (err < 0)
3321 3322 3323 3324
			dev_err(hba->dev, "%s: failed to handle urgent bkops %d\n",
					__func__, err);
	}
out:
3325
	pm_runtime_put_sync(hba->dev);
3326 3327 3328
	return;
}

3329
/**
3330 3331
 * ufshcd_err_handler - handle UFS errors that require s/w attention
 * @work: pointer to work structure
3332
 */
3333
static void ufshcd_err_handler(struct work_struct *work)
3334 3335
{
	struct ufs_hba *hba;
3336 3337 3338 3339 3340 3341 3342
	unsigned long flags;
	u32 err_xfer = 0;
	u32 err_tm = 0;
	int err = 0;
	int tag;

	hba = container_of(work, struct ufs_hba, eh_work);
3343

3344
	pm_runtime_get_sync(hba->dev);
3345
	ufshcd_hold(hba, false);
3346 3347 3348 3349 3350 3351 3352 3353 3354 3355 3356 3357 3358 3359 3360 3361 3362 3363 3364 3365 3366 3367 3368 3369 3370 3371 3372 3373 3374 3375 3376 3377 3378 3379 3380 3381 3382 3383 3384 3385 3386 3387 3388 3389 3390 3391 3392 3393 3394 3395 3396 3397 3398

	spin_lock_irqsave(hba->host->host_lock, flags);
	if (hba->ufshcd_state == UFSHCD_STATE_RESET) {
		spin_unlock_irqrestore(hba->host->host_lock, flags);
		goto out;
	}

	hba->ufshcd_state = UFSHCD_STATE_RESET;
	ufshcd_set_eh_in_progress(hba);

	/* Complete requests that have door-bell cleared by h/w */
	ufshcd_transfer_req_compl(hba);
	ufshcd_tmc_handler(hba);
	spin_unlock_irqrestore(hba->host->host_lock, flags);

	/* Clear pending transfer requests */
	for_each_set_bit(tag, &hba->outstanding_reqs, hba->nutrs)
		if (ufshcd_clear_cmd(hba, tag))
			err_xfer |= 1 << tag;

	/* Clear pending task management requests */
	for_each_set_bit(tag, &hba->outstanding_tasks, hba->nutmrs)
		if (ufshcd_clear_tm_cmd(hba, tag))
			err_tm |= 1 << tag;

	/* Complete the requests that are cleared by s/w */
	spin_lock_irqsave(hba->host->host_lock, flags);
	ufshcd_transfer_req_compl(hba);
	ufshcd_tmc_handler(hba);
	spin_unlock_irqrestore(hba->host->host_lock, flags);

	/* Fatal errors need reset */
	if (err_xfer || err_tm || (hba->saved_err & INT_FATAL_ERRORS) ||
			((hba->saved_err & UIC_ERROR) &&
			 (hba->saved_uic_err & UFSHCD_UIC_DL_PA_INIT_ERROR))) {
		err = ufshcd_reset_and_restore(hba);
		if (err) {
			dev_err(hba->dev, "%s: reset and restore failed\n",
					__func__);
			hba->ufshcd_state = UFSHCD_STATE_ERROR;
		}
		/*
		 * Inform scsi mid-layer that we did reset and allow to handle
		 * Unit Attention properly.
		 */
		scsi_report_bus_reset(hba->host, 0);
		hba->saved_err = 0;
		hba->saved_uic_err = 0;
	}
	ufshcd_clear_eh_in_progress(hba);

out:
	scsi_unblock_requests(hba->host);
3399
	ufshcd_release(hba);
3400
	pm_runtime_put_sync(hba->dev);
3401 3402 3403
}

/**
3404 3405
 * ufshcd_update_uic_error - check and set fatal UIC error flags.
 * @hba: per-adapter instance
3406
 */
3407
static void ufshcd_update_uic_error(struct ufs_hba *hba)
3408 3409 3410
{
	u32 reg;

3411 3412 3413 3414 3415 3416 3417 3418 3419 3420 3421 3422 3423 3424 3425 3426 3427 3428 3429 3430 3431 3432 3433 3434 3435 3436 3437 3438 3439 3440
	/* PA_INIT_ERROR is fatal and needs UIC reset */
	reg = ufshcd_readl(hba, REG_UIC_ERROR_CODE_DATA_LINK_LAYER);
	if (reg & UIC_DATA_LINK_LAYER_ERROR_PA_INIT)
		hba->uic_error |= UFSHCD_UIC_DL_PA_INIT_ERROR;

	/* UIC NL/TL/DME errors needs software retry */
	reg = ufshcd_readl(hba, REG_UIC_ERROR_CODE_NETWORK_LAYER);
	if (reg)
		hba->uic_error |= UFSHCD_UIC_NL_ERROR;

	reg = ufshcd_readl(hba, REG_UIC_ERROR_CODE_TRANSPORT_LAYER);
	if (reg)
		hba->uic_error |= UFSHCD_UIC_TL_ERROR;

	reg = ufshcd_readl(hba, REG_UIC_ERROR_CODE_DME);
	if (reg)
		hba->uic_error |= UFSHCD_UIC_DME_ERROR;

	dev_dbg(hba->dev, "%s: UIC error flags = 0x%08x\n",
			__func__, hba->uic_error);
}

/**
 * ufshcd_check_errors - Check for errors that need s/w attention
 * @hba: per-adapter instance
 */
static void ufshcd_check_errors(struct ufs_hba *hba)
{
	bool queue_eh_work = false;

3441
	if (hba->errors & INT_FATAL_ERRORS)
3442
		queue_eh_work = true;
3443 3444

	if (hba->errors & UIC_ERROR) {
3445 3446 3447 3448
		hba->uic_error = 0;
		ufshcd_update_uic_error(hba);
		if (hba->uic_error)
			queue_eh_work = true;
3449
	}
3450 3451 3452 3453 3454 3455 3456 3457 3458 3459 3460 3461 3462 3463

	if (queue_eh_work) {
		/* handle fatal errors only when link is functional */
		if (hba->ufshcd_state == UFSHCD_STATE_OPERATIONAL) {
			/* block commands from scsi mid-layer */
			scsi_block_requests(hba->host);

			/* transfer error masks to sticky bits */
			hba->saved_err |= hba->errors;
			hba->saved_uic_err |= hba->uic_error;

			hba->ufshcd_state = UFSHCD_STATE_ERROR;
			schedule_work(&hba->eh_work);
		}
3464
	}
3465 3466 3467 3468 3469 3470
	/*
	 * if (!queue_eh_work) -
	 * Other errors are either non-fatal where host recovers
	 * itself without s/w intervention or errors that will be
	 * handled by the SCSI core layer.
	 */
3471 3472 3473 3474 3475 3476 3477 3478 3479 3480
}

/**
 * ufshcd_tmc_handler - handle task management function completion
 * @hba: per adapter instance
 */
static void ufshcd_tmc_handler(struct ufs_hba *hba)
{
	u32 tm_doorbell;

3481
	tm_doorbell = ufshcd_readl(hba, REG_UTP_TASK_REQ_DOOR_BELL);
3482
	hba->tm_condition = tm_doorbell ^ hba->outstanding_tasks;
3483
	wake_up(&hba->tm_wq);
3484 3485 3486 3487 3488 3489 3490 3491 3492 3493 3494
}

/**
 * ufshcd_sl_intr - Interrupt service routine
 * @hba: per adapter instance
 * @intr_status: contains interrupts generated by the controller
 */
static void ufshcd_sl_intr(struct ufs_hba *hba, u32 intr_status)
{
	hba->errors = UFSHCD_ERROR_MASK & intr_status;
	if (hba->errors)
3495
		ufshcd_check_errors(hba);
3496

3497 3498
	if (intr_status & UFSHCD_UIC_MASK)
		ufshcd_uic_cmd_compl(hba, intr_status);
3499 3500 3501 3502 3503 3504 3505 3506 3507 3508 3509 3510 3511 3512 3513 3514 3515 3516 3517 3518 3519 3520 3521

	if (intr_status & UTP_TASK_REQ_COMPL)
		ufshcd_tmc_handler(hba);

	if (intr_status & UTP_TRANSFER_REQ_COMPL)
		ufshcd_transfer_req_compl(hba);
}

/**
 * ufshcd_intr - Main interrupt service routine
 * @irq: irq number
 * @__hba: pointer to adapter instance
 *
 * Returns IRQ_HANDLED - If interrupt is valid
 *		IRQ_NONE - If invalid interrupt
 */
static irqreturn_t ufshcd_intr(int irq, void *__hba)
{
	u32 intr_status;
	irqreturn_t retval = IRQ_NONE;
	struct ufs_hba *hba = __hba;

	spin_lock(hba->host->host_lock);
3522
	intr_status = ufshcd_readl(hba, REG_INTERRUPT_STATUS);
3523 3524

	if (intr_status) {
3525
		ufshcd_writel(hba, intr_status, REG_INTERRUPT_STATUS);
3526 3527 3528 3529 3530 3531 3532
		ufshcd_sl_intr(hba, intr_status);
		retval = IRQ_HANDLED;
	}
	spin_unlock(hba->host->host_lock);
	return retval;
}

3533 3534 3535 3536 3537 3538 3539 3540 3541 3542 3543 3544 3545 3546 3547 3548 3549 3550 3551 3552 3553
static int ufshcd_clear_tm_cmd(struct ufs_hba *hba, int tag)
{
	int err = 0;
	u32 mask = 1 << tag;
	unsigned long flags;

	if (!test_bit(tag, &hba->outstanding_tasks))
		goto out;

	spin_lock_irqsave(hba->host->host_lock, flags);
	ufshcd_writel(hba, ~(1 << tag), REG_UTP_TASK_REQ_LIST_CLEAR);
	spin_unlock_irqrestore(hba->host->host_lock, flags);

	/* poll for max. 1 sec to clear door bell register by h/w */
	err = ufshcd_wait_for_register(hba,
			REG_UTP_TASK_REQ_DOOR_BELL,
			mask, 0, 1000, 1000);
out:
	return err;
}

3554 3555 3556
/**
 * ufshcd_issue_tm_cmd - issues task management commands to controller
 * @hba: per adapter instance
3557 3558 3559 3560
 * @lun_id: LUN ID to which TM command is sent
 * @task_id: task ID to which the TM command is applicable
 * @tm_function: task management function opcode
 * @tm_response: task management service response return value
3561
 *
3562
 * Returns non-zero value on error, zero on success.
3563
 */
3564 3565
static int ufshcd_issue_tm_cmd(struct ufs_hba *hba, int lun_id, int task_id,
		u8 tm_function, u8 *tm_response)
3566 3567 3568 3569 3570
{
	struct utp_task_req_desc *task_req_descp;
	struct utp_upiu_task_req *task_req_upiup;
	struct Scsi_Host *host;
	unsigned long flags;
3571
	int free_slot;
3572
	int err;
3573
	int task_tag;
3574 3575 3576

	host = hba->host;

3577 3578 3579 3580 3581 3582
	/*
	 * Get free slot, sleep if slots are unavailable.
	 * Even though we use wait_event() which sleeps indefinitely,
	 * the maximum wait time is bounded by %TM_CMD_TIMEOUT.
	 */
	wait_event(hba->tm_tag_wq, ufshcd_get_tm_free_slot(hba, &free_slot));
3583
	ufshcd_hold(hba, false);
3584

3585
	spin_lock_irqsave(host->host_lock, flags);
3586 3587 3588 3589 3590 3591 3592 3593 3594 3595 3596
	task_req_descp = hba->utmrdl_base_addr;
	task_req_descp += free_slot;

	/* Configure task request descriptor */
	task_req_descp->header.dword_0 = cpu_to_le32(UTP_REQ_DESC_INT_CMD);
	task_req_descp->header.dword_2 =
			cpu_to_le32(OCS_INVALID_COMMAND_STATUS);

	/* Configure task request UPIU */
	task_req_upiup =
		(struct utp_upiu_task_req *) task_req_descp->task_req_upiu;
3597
	task_tag = hba->nutrs + free_slot;
3598
	task_req_upiup->header.dword_0 =
3599
		UPIU_HEADER_DWORD(UPIU_TRANSACTION_TASK_REQ, 0,
3600
					      lun_id, task_tag);
3601
	task_req_upiup->header.dword_1 =
3602
		UPIU_HEADER_DWORD(0, tm_function, 0, 0);
3603 3604 3605 3606
	/*
	 * The host shall provide the same value for LUN field in the basic
	 * header and for Input Parameter.
	 */
3607 3608
	task_req_upiup->input_param1 = cpu_to_be32(lun_id);
	task_req_upiup->input_param2 = cpu_to_be32(task_id);
3609 3610 3611

	/* send command to the controller */
	__set_bit(free_slot, &hba->outstanding_tasks);
3612
	ufshcd_writel(hba, 1 << free_slot, REG_UTP_TASK_REQ_DOOR_BELL);
3613 3614 3615 3616

	spin_unlock_irqrestore(host->host_lock, flags);

	/* wait until the task management command is completed */
3617 3618 3619
	err = wait_event_timeout(hba->tm_wq,
			test_bit(free_slot, &hba->tm_condition),
			msecs_to_jiffies(TM_CMD_TIMEOUT));
3620
	if (!err) {
3621 3622 3623 3624 3625 3626 3627 3628
		dev_err(hba->dev, "%s: task management cmd 0x%.2x timed-out\n",
				__func__, tm_function);
		if (ufshcd_clear_tm_cmd(hba, free_slot))
			dev_WARN(hba->dev, "%s: unable clear tm cmd (slot %d) after timeout\n",
					__func__, free_slot);
		err = -ETIMEDOUT;
	} else {
		err = ufshcd_task_req_compl(hba, free_slot, tm_response);
3629
	}
3630

3631
	clear_bit(free_slot, &hba->tm_condition);
3632 3633 3634
	ufshcd_put_tm_slot(hba, free_slot);
	wake_up(&hba->tm_tag_wq);

3635
	ufshcd_release(hba);
3636 3637 3638 3639
	return err;
}

/**
3640 3641
 * ufshcd_eh_device_reset_handler - device reset handler registered to
 *                                    scsi layer.
3642 3643 3644 3645
 * @cmd: SCSI command pointer
 *
 * Returns SUCCESS/FAILED
 */
3646
static int ufshcd_eh_device_reset_handler(struct scsi_cmnd *cmd)
3647 3648 3649 3650 3651 3652
{
	struct Scsi_Host *host;
	struct ufs_hba *hba;
	unsigned int tag;
	u32 pos;
	int err;
3653 3654
	u8 resp = 0xF;
	struct ufshcd_lrb *lrbp;
3655
	unsigned long flags;
3656 3657 3658 3659 3660

	host = cmd->device->host;
	hba = shost_priv(host);
	tag = cmd->request->tag;

3661 3662 3663
	lrbp = &hba->lrb[tag];
	err = ufshcd_issue_tm_cmd(hba, lrbp->lun, 0, UFS_LOGICAL_RESET, &resp);
	if (err || resp != UPIU_TASK_MANAGEMENT_FUNC_COMPL) {
3664 3665
		if (!err)
			err = resp;
3666
		goto out;
3667
	}
3668

3669 3670 3671 3672 3673 3674
	/* clear the commands that were pending for corresponding LUN */
	for_each_set_bit(pos, &hba->outstanding_reqs, hba->nutrs) {
		if (hba->lrb[pos].lun == lrbp->lun) {
			err = ufshcd_clear_cmd(hba, pos);
			if (err)
				break;
3675
		}
3676 3677 3678 3679
	}
	spin_lock_irqsave(host->host_lock, flags);
	ufshcd_transfer_req_compl(hba);
	spin_unlock_irqrestore(host->host_lock, flags);
3680
out:
3681 3682 3683 3684 3685 3686
	if (!err) {
		err = SUCCESS;
	} else {
		dev_err(hba->dev, "%s: failed with err %d\n", __func__, err);
		err = FAILED;
	}
3687 3688 3689 3690 3691 3692 3693
	return err;
}

/**
 * ufshcd_abort - abort a specific command
 * @cmd: SCSI command pointer
 *
3694 3695 3696 3697 3698 3699
 * Abort the pending command in device by sending UFS_ABORT_TASK task management
 * command, and in host controller by clearing the door-bell register. There can
 * be race between controller sending the command to the device while abort is
 * issued. To avoid that, first issue UFS_QUERY_TASK to check if the command is
 * really issued and then try to abort it.
 *
3700 3701 3702 3703 3704 3705 3706 3707
 * Returns SUCCESS/FAILED
 */
static int ufshcd_abort(struct scsi_cmnd *cmd)
{
	struct Scsi_Host *host;
	struct ufs_hba *hba;
	unsigned long flags;
	unsigned int tag;
3708 3709
	int err = 0;
	int poll_cnt;
3710 3711
	u8 resp = 0xF;
	struct ufshcd_lrb *lrbp;
3712
	u32 reg;
3713 3714 3715 3716 3717

	host = cmd->device->host;
	hba = shost_priv(host);
	tag = cmd->request->tag;

3718
	ufshcd_hold(hba, false);
3719 3720 3721
	/* If command is already aborted/completed, return SUCCESS */
	if (!(test_bit(tag, &hba->outstanding_reqs)))
		goto out;
3722

3723 3724 3725 3726 3727 3728 3729
	reg = ufshcd_readl(hba, REG_UTP_TRANSFER_REQ_DOOR_BELL);
	if (!(reg & (1 << tag))) {
		dev_err(hba->dev,
		"%s: cmd was completed, but without a notifying intr, tag = %d",
		__func__, tag);
	}

3730 3731 3732 3733 3734 3735 3736 3737 3738 3739 3740 3741 3742 3743 3744 3745 3746 3747 3748 3749 3750 3751 3752 3753 3754 3755 3756 3757 3758
	lrbp = &hba->lrb[tag];
	for (poll_cnt = 100; poll_cnt; poll_cnt--) {
		err = ufshcd_issue_tm_cmd(hba, lrbp->lun, lrbp->task_tag,
				UFS_QUERY_TASK, &resp);
		if (!err && resp == UPIU_TASK_MANAGEMENT_FUNC_SUCCEEDED) {
			/* cmd pending in the device */
			break;
		} else if (!err && resp == UPIU_TASK_MANAGEMENT_FUNC_COMPL) {
			/*
			 * cmd not pending in the device, check if it is
			 * in transition.
			 */
			reg = ufshcd_readl(hba, REG_UTP_TRANSFER_REQ_DOOR_BELL);
			if (reg & (1 << tag)) {
				/* sleep for max. 200us to stabilize */
				usleep_range(100, 200);
				continue;
			}
			/* command completed already */
			goto out;
		} else {
			if (!err)
				err = resp; /* service response error */
			goto out;
		}
	}

	if (!poll_cnt) {
		err = -EBUSY;
3759 3760 3761
		goto out;
	}

3762 3763 3764
	err = ufshcd_issue_tm_cmd(hba, lrbp->lun, lrbp->task_tag,
			UFS_ABORT_TASK, &resp);
	if (err || resp != UPIU_TASK_MANAGEMENT_FUNC_COMPL) {
3765 3766
		if (!err)
			err = resp; /* service response error */
3767
		goto out;
3768
	}
3769

3770 3771 3772 3773
	err = ufshcd_clear_cmd(hba, tag);
	if (err)
		goto out;

3774 3775 3776 3777 3778 3779
	scsi_dma_unmap(cmd);

	spin_lock_irqsave(host->host_lock, flags);
	__clear_bit(tag, &hba->outstanding_reqs);
	hba->lrb[tag].cmd = NULL;
	spin_unlock_irqrestore(host->host_lock, flags);
3780 3781 3782

	clear_bit_unlock(tag, &hba->lrb_in_use);
	wake_up(&hba->dev_cmd.tag_wq);
3783

3784
out:
3785 3786 3787 3788 3789 3790 3791
	if (!err) {
		err = SUCCESS;
	} else {
		dev_err(hba->dev, "%s: failed with err %d\n", __func__, err);
		err = FAILED;
	}

3792 3793 3794 3795 3796
	/*
	 * This ufshcd_release() corresponds to the original scsi cmd that got
	 * aborted here (as we won't get any IRQ for it).
	 */
	ufshcd_release(hba);
3797 3798 3799
	return err;
}

3800 3801 3802 3803 3804 3805 3806 3807 3808 3809 3810 3811 3812 3813 3814 3815 3816 3817 3818 3819 3820 3821 3822 3823 3824
/**
 * ufshcd_host_reset_and_restore - reset and restore host controller
 * @hba: per-adapter instance
 *
 * Note that host controller reset may issue DME_RESET to
 * local and remote (device) Uni-Pro stack and the attributes
 * are reset to default state.
 *
 * Returns zero on success, non-zero on failure
 */
static int ufshcd_host_reset_and_restore(struct ufs_hba *hba)
{
	int err;
	unsigned long flags;

	/* Reset the host controller */
	spin_lock_irqsave(hba->host->host_lock, flags);
	ufshcd_hba_stop(hba);
	spin_unlock_irqrestore(hba->host->host_lock, flags);

	err = ufshcd_hba_enable(hba);
	if (err)
		goto out;

	/* Establish the link again and restore the device */
S
Sujit Reddy Thumma 已提交
3825 3826 3827
	err = ufshcd_probe_hba(hba);

	if (!err && (hba->ufshcd_state != UFSHCD_STATE_OPERATIONAL))
3828 3829 3830 3831 3832 3833 3834 3835 3836 3837 3838 3839 3840 3841 3842 3843 3844 3845 3846 3847 3848
		err = -EIO;
out:
	if (err)
		dev_err(hba->dev, "%s: Host init failed %d\n", __func__, err);

	return err;
}

/**
 * ufshcd_reset_and_restore - reset and re-initialize host/device
 * @hba: per-adapter instance
 *
 * Reset and recover device, host and re-establish link. This
 * is helpful to recover the communication in fatal error conditions.
 *
 * Returns zero on success, non-zero on failure
 */
static int ufshcd_reset_and_restore(struct ufs_hba *hba)
{
	int err = 0;
	unsigned long flags;
S
Sujit Reddy Thumma 已提交
3849
	int retries = MAX_HOST_RESET_RETRIES;
3850

S
Sujit Reddy Thumma 已提交
3851 3852 3853
	do {
		err = ufshcd_host_reset_and_restore(hba);
	} while (err && --retries);
3854 3855 3856 3857 3858 3859 3860 3861 3862 3863 3864 3865 3866 3867 3868 3869 3870 3871 3872 3873 3874 3875 3876 3877 3878 3879 3880

	/*
	 * After reset the door-bell might be cleared, complete
	 * outstanding requests in s/w here.
	 */
	spin_lock_irqsave(hba->host->host_lock, flags);
	ufshcd_transfer_req_compl(hba);
	ufshcd_tmc_handler(hba);
	spin_unlock_irqrestore(hba->host->host_lock, flags);

	return err;
}

/**
 * ufshcd_eh_host_reset_handler - host reset handler registered to scsi layer
 * @cmd - SCSI command pointer
 *
 * Returns SUCCESS/FAILED
 */
static int ufshcd_eh_host_reset_handler(struct scsi_cmnd *cmd)
{
	int err;
	unsigned long flags;
	struct ufs_hba *hba;

	hba = shost_priv(cmd->device->host);

3881
	ufshcd_hold(hba, false);
3882 3883 3884 3885 3886 3887 3888 3889
	/*
	 * Check if there is any race with fatal error handling.
	 * If so, wait for it to complete. Even though fatal error
	 * handling does reset and restore in some cases, don't assume
	 * anything out of it. We are just avoiding race here.
	 */
	do {
		spin_lock_irqsave(hba->host->host_lock, flags);
3890
		if (!(work_pending(&hba->eh_work) ||
3891 3892 3893 3894
				hba->ufshcd_state == UFSHCD_STATE_RESET))
			break;
		spin_unlock_irqrestore(hba->host->host_lock, flags);
		dev_dbg(hba->dev, "%s: reset in progress\n", __func__);
3895
		flush_work(&hba->eh_work);
3896 3897 3898 3899 3900 3901 3902 3903 3904 3905 3906 3907 3908 3909 3910 3911 3912 3913 3914
	} while (1);

	hba->ufshcd_state = UFSHCD_STATE_RESET;
	ufshcd_set_eh_in_progress(hba);
	spin_unlock_irqrestore(hba->host->host_lock, flags);

	err = ufshcd_reset_and_restore(hba);

	spin_lock_irqsave(hba->host->host_lock, flags);
	if (!err) {
		err = SUCCESS;
		hba->ufshcd_state = UFSHCD_STATE_OPERATIONAL;
	} else {
		err = FAILED;
		hba->ufshcd_state = UFSHCD_STATE_ERROR;
	}
	ufshcd_clear_eh_in_progress(hba);
	spin_unlock_irqrestore(hba->host->host_lock, flags);

3915
	ufshcd_release(hba);
3916 3917 3918
	return err;
}

3919 3920 3921 3922 3923 3924 3925 3926 3927 3928 3929 3930 3931 3932 3933 3934 3935 3936 3937 3938 3939 3940 3941 3942 3943 3944 3945 3946 3947 3948 3949 3950 3951 3952 3953 3954 3955 3956 3957 3958 3959 3960 3961 3962 3963 3964 3965 3966 3967 3968 3969 3970 3971 3972 3973 3974 3975 3976 3977 3978 3979 3980 3981 3982 3983 3984 3985 3986 3987 3988 3989 3990 3991 3992 3993 3994 3995 3996 3997 3998 3999 4000 4001 4002 4003 4004 4005 4006 4007 4008 4009 4010 4011 4012 4013 4014 4015 4016 4017 4018 4019 4020 4021 4022 4023 4024 4025 4026 4027 4028 4029 4030 4031 4032 4033 4034 4035 4036 4037
/**
 * ufshcd_get_max_icc_level - calculate the ICC level
 * @sup_curr_uA: max. current supported by the regulator
 * @start_scan: row at the desc table to start scan from
 * @buff: power descriptor buffer
 *
 * Returns calculated max ICC level for specific regulator
 */
static u32 ufshcd_get_max_icc_level(int sup_curr_uA, u32 start_scan, char *buff)
{
	int i;
	int curr_uA;
	u16 data;
	u16 unit;

	for (i = start_scan; i >= 0; i--) {
		data = be16_to_cpu(*((u16 *)(buff + 2*i)));
		unit = (data & ATTR_ICC_LVL_UNIT_MASK) >>
						ATTR_ICC_LVL_UNIT_OFFSET;
		curr_uA = data & ATTR_ICC_LVL_VALUE_MASK;
		switch (unit) {
		case UFSHCD_NANO_AMP:
			curr_uA = curr_uA / 1000;
			break;
		case UFSHCD_MILI_AMP:
			curr_uA = curr_uA * 1000;
			break;
		case UFSHCD_AMP:
			curr_uA = curr_uA * 1000 * 1000;
			break;
		case UFSHCD_MICRO_AMP:
		default:
			break;
		}
		if (sup_curr_uA >= curr_uA)
			break;
	}
	if (i < 0) {
		i = 0;
		pr_err("%s: Couldn't find valid icc_level = %d", __func__, i);
	}

	return (u32)i;
}

/**
 * ufshcd_calc_icc_level - calculate the max ICC level
 * In case regulators are not initialized we'll return 0
 * @hba: per-adapter instance
 * @desc_buf: power descriptor buffer to extract ICC levels from.
 * @len: length of desc_buff
 *
 * Returns calculated ICC level
 */
static u32 ufshcd_find_max_sup_active_icc_level(struct ufs_hba *hba,
							u8 *desc_buf, int len)
{
	u32 icc_level = 0;

	if (!hba->vreg_info.vcc || !hba->vreg_info.vccq ||
						!hba->vreg_info.vccq2) {
		dev_err(hba->dev,
			"%s: Regulator capability was not set, actvIccLevel=%d",
							__func__, icc_level);
		goto out;
	}

	if (hba->vreg_info.vcc)
		icc_level = ufshcd_get_max_icc_level(
				hba->vreg_info.vcc->max_uA,
				POWER_DESC_MAX_ACTV_ICC_LVLS - 1,
				&desc_buf[PWR_DESC_ACTIVE_LVLS_VCC_0]);

	if (hba->vreg_info.vccq)
		icc_level = ufshcd_get_max_icc_level(
				hba->vreg_info.vccq->max_uA,
				icc_level,
				&desc_buf[PWR_DESC_ACTIVE_LVLS_VCCQ_0]);

	if (hba->vreg_info.vccq2)
		icc_level = ufshcd_get_max_icc_level(
				hba->vreg_info.vccq2->max_uA,
				icc_level,
				&desc_buf[PWR_DESC_ACTIVE_LVLS_VCCQ2_0]);
out:
	return icc_level;
}

static void ufshcd_init_icc_levels(struct ufs_hba *hba)
{
	int ret;
	int buff_len = QUERY_DESC_POWER_MAX_SIZE;
	u8 desc_buf[QUERY_DESC_POWER_MAX_SIZE];

	ret = ufshcd_read_power_desc(hba, desc_buf, buff_len);
	if (ret) {
		dev_err(hba->dev,
			"%s: Failed reading power descriptor.len = %d ret = %d",
			__func__, buff_len, ret);
		return;
	}

	hba->init_prefetch_data.icc_level =
			ufshcd_find_max_sup_active_icc_level(hba,
			desc_buf, buff_len);
	dev_dbg(hba->dev, "%s: setting icc_level 0x%x",
			__func__, hba->init_prefetch_data.icc_level);

	ret = ufshcd_query_attr(hba, UPIU_QUERY_OPCODE_WRITE_ATTR,
			QUERY_ATTR_IDN_ACTIVE_ICC_LVL, 0, 0,
			&hba->init_prefetch_data.icc_level);

	if (ret)
		dev_err(hba->dev,
			"%s: Failed configuring bActiveICCLevel = %d ret = %d",
			__func__, hba->init_prefetch_data.icc_level , ret);

}

4038 4039 4040 4041 4042 4043 4044 4045 4046 4047 4048 4049 4050 4051 4052 4053 4054 4055 4056 4057 4058 4059 4060 4061 4062 4063 4064 4065 4066
/**
 * ufshcd_scsi_add_wlus - Adds required W-LUs
 * @hba: per-adapter instance
 *
 * UFS device specification requires the UFS devices to support 4 well known
 * logical units:
 *	"REPORT_LUNS" (address: 01h)
 *	"UFS Device" (address: 50h)
 *	"RPMB" (address: 44h)
 *	"BOOT" (address: 30h)
 * UFS device's power management needs to be controlled by "POWER CONDITION"
 * field of SSU (START STOP UNIT) command. But this "power condition" field
 * will take effect only when its sent to "UFS device" well known logical unit
 * hence we require the scsi_device instance to represent this logical unit in
 * order for the UFS host driver to send the SSU command for power management.

 * We also require the scsi_device instance for "RPMB" (Replay Protected Memory
 * Block) LU so user space process can control this LU. User space may also
 * want to have access to BOOT LU.

 * This function adds scsi device instances for each of all well known LUs
 * (except "REPORT LUNS" LU).
 *
 * Returns zero on success (all required W-LUs are added successfully),
 * non-zero error value on failure (if failed to add any of the required W-LU).
 */
static int ufshcd_scsi_add_wlus(struct ufs_hba *hba)
{
	int ret = 0;
4067 4068
	struct scsi_device *sdev_rpmb;
	struct scsi_device *sdev_boot;
4069 4070 4071 4072 4073 4074 4075 4076

	hba->sdev_ufs_device = __scsi_add_device(hba->host, 0, 0,
		ufshcd_upiu_wlun_to_scsi_wlun(UFS_UPIU_UFS_DEVICE_WLUN), NULL);
	if (IS_ERR(hba->sdev_ufs_device)) {
		ret = PTR_ERR(hba->sdev_ufs_device);
		hba->sdev_ufs_device = NULL;
		goto out;
	}
4077
	scsi_device_put(hba->sdev_ufs_device);
4078

4079
	sdev_boot = __scsi_add_device(hba->host, 0, 0,
4080
		ufshcd_upiu_wlun_to_scsi_wlun(UFS_UPIU_BOOT_WLUN), NULL);
4081 4082
	if (IS_ERR(sdev_boot)) {
		ret = PTR_ERR(sdev_boot);
4083 4084
		goto remove_sdev_ufs_device;
	}
4085
	scsi_device_put(sdev_boot);
4086

4087
	sdev_rpmb = __scsi_add_device(hba->host, 0, 0,
4088
		ufshcd_upiu_wlun_to_scsi_wlun(UFS_UPIU_RPMB_WLUN), NULL);
4089 4090
	if (IS_ERR(sdev_rpmb)) {
		ret = PTR_ERR(sdev_rpmb);
4091 4092
		goto remove_sdev_boot;
	}
4093
	scsi_device_put(sdev_rpmb);
4094 4095 4096
	goto out;

remove_sdev_boot:
4097
	scsi_remove_device(sdev_boot);
4098 4099 4100 4101 4102 4103
remove_sdev_ufs_device:
	scsi_remove_device(hba->sdev_ufs_device);
out:
	return ret;
}

4104
/**
S
Sujit Reddy Thumma 已提交
4105 4106 4107 4108
 * ufshcd_probe_hba - probe hba to detect device and initialize
 * @hba: per-adapter instance
 *
 * Execute link-startup and verify device initialization
4109
 */
S
Sujit Reddy Thumma 已提交
4110
static int ufshcd_probe_hba(struct ufs_hba *hba)
4111 4112 4113 4114
{
	int ret;

	ret = ufshcd_link_startup(hba);
4115 4116 4117
	if (ret)
		goto out;

4118 4119
	ufshcd_init_pwr_info(hba);

4120 4121
	/* UniPro link is active now */
	ufshcd_set_link_active(hba);
4122

4123 4124 4125
	ret = ufshcd_verify_dev_init(hba);
	if (ret)
		goto out;
4126 4127 4128 4129

	ret = ufshcd_complete_dev_init(hba);
	if (ret)
		goto out;
4130

4131 4132
	/* UFS device is also active now */
	ufshcd_set_ufs_dev_active(hba);
4133
	ufshcd_force_reset_auto_bkops(hba);
4134
	hba->ufshcd_state = UFSHCD_STATE_OPERATIONAL;
4135 4136
	hba->wlun_dev_clr_ua = true;

D
Dolev Raviv 已提交
4137 4138 4139 4140 4141 4142 4143 4144 4145 4146
	if (ufshcd_get_max_pwr_mode(hba)) {
		dev_err(hba->dev,
			"%s: Failed getting max supported power mode\n",
			__func__);
	} else {
		ret = ufshcd_config_pwr_mode(hba, &hba->max_pwr_info.info);
		if (ret)
			dev_err(hba->dev, "%s: Failed setting power mode, err = %d\n",
					__func__, ret);
	}
4147 4148 4149 4150 4151 4152 4153 4154 4155 4156 4157 4158 4159

	/*
	 * If we are in error handling context or in power management callbacks
	 * context, no need to scan the host
	 */
	if (!ufshcd_eh_in_progress(hba) && !hba->pm_op_in_progress) {
		bool flag;

		/* clear any previous UFS device information */
		memset(&hba->dev_info, 0, sizeof(hba->dev_info));
		if (!ufshcd_query_flag(hba, UPIU_QUERY_OPCODE_READ_FLAG,
				       QUERY_FLAG_IDN_PWR_ON_WPE, &flag))
			hba->dev_info.f_power_on_wp_en = flag;
4160

4161 4162 4163
		if (!hba->is_init_prefetch)
			ufshcd_init_icc_levels(hba);

4164 4165 4166 4167
		/* Add required well known logical units to scsi mid layer */
		if (ufshcd_scsi_add_wlus(hba))
			goto out;

4168 4169 4170
		scsi_scan_host(hba->host);
		pm_runtime_put_sync(hba->dev);
	}
4171 4172 4173 4174

	if (!hba->is_init_prefetch)
		hba->is_init_prefetch = true;

4175 4176 4177 4178
	/* Resume devfreq after UFS device is detected */
	if (ufshcd_is_clkscaling_enabled(hba))
		devfreq_resume_device(hba->devfreq);

4179
out:
S
Sujit Reddy Thumma 已提交
4180 4181 4182 4183
	/*
	 * If we failed to initialize the device or the device is not
	 * present, turn off the power/clocks etc.
	 */
4184 4185
	if (ret && !ufshcd_eh_in_progress(hba) && !hba->pm_op_in_progress) {
		pm_runtime_put_sync(hba->dev);
S
Sujit Reddy Thumma 已提交
4186
		ufshcd_hba_exit(hba);
4187
	}
S
Sujit Reddy Thumma 已提交
4188 4189 4190 4191 4192 4193 4194 4195 4196 4197 4198 4199 4200 4201

	return ret;
}

/**
 * ufshcd_async_scan - asynchronous execution for probing hba
 * @data: data pointer to pass to this function
 * @cookie: cookie data
 */
static void ufshcd_async_scan(void *data, async_cookie_t cookie)
{
	struct ufs_hba *hba = (struct ufs_hba *)data;

	ufshcd_probe_hba(hba);
4202 4203
}

4204 4205 4206 4207 4208 4209
static struct scsi_host_template ufshcd_driver_template = {
	.module			= THIS_MODULE,
	.name			= UFSHCD,
	.proc_name		= UFSHCD,
	.queuecommand		= ufshcd_queuecommand,
	.slave_alloc		= ufshcd_slave_alloc,
4210
	.slave_configure	= ufshcd_slave_configure,
4211
	.slave_destroy		= ufshcd_slave_destroy,
4212
	.change_queue_depth	= ufshcd_change_queue_depth,
4213
	.eh_abort_handler	= ufshcd_abort,
4214 4215
	.eh_device_reset_handler = ufshcd_eh_device_reset_handler,
	.eh_host_reset_handler   = ufshcd_eh_host_reset_handler,
4216 4217 4218 4219
	.this_id		= -1,
	.sg_tablesize		= SG_ALL,
	.cmd_per_lun		= UFSHCD_CMD_PER_LUN,
	.can_queue		= UFSHCD_CAN_QUEUE,
4220
	.max_host_blocked	= 1,
4221
	.use_blk_tags		= 1,
4222
	.track_queue_depth	= 1,
4223 4224
};

4225 4226 4227 4228 4229 4230 4231 4232 4233 4234 4235 4236 4237 4238 4239 4240 4241 4242 4243 4244 4245 4246 4247 4248 4249 4250 4251
static int ufshcd_config_vreg_load(struct device *dev, struct ufs_vreg *vreg,
				   int ua)
{
	int ret = 0;
	struct regulator *reg = vreg->reg;
	const char *name = vreg->name;

	BUG_ON(!vreg);

	ret = regulator_set_optimum_mode(reg, ua);
	if (ret >= 0) {
		/*
		 * regulator_set_optimum_mode() returns new regulator
		 * mode upon success.
		 */
		ret = 0;
	} else {
		dev_err(dev, "%s: %s set optimum mode(ua=%d) failed, err=%d\n",
				__func__, name, ua, ret);
	}

	return ret;
}

static inline int ufshcd_config_vreg_lpm(struct ufs_hba *hba,
					 struct ufs_vreg *vreg)
{
4252 4253 4254
	if (!vreg)
		return 0;

4255 4256 4257 4258 4259 4260
	return ufshcd_config_vreg_load(hba->dev, vreg, UFS_VREG_LPM_LOAD_UA);
}

static inline int ufshcd_config_vreg_hpm(struct ufs_hba *hba,
					 struct ufs_vreg *vreg)
{
4261 4262 4263
	if (!vreg)
		return 0;

4264 4265 4266
	return ufshcd_config_vreg_load(hba->dev, vreg, vreg->max_uA);
}

4267 4268 4269 4270 4271 4272 4273 4274 4275 4276 4277 4278 4279 4280 4281 4282 4283 4284 4285 4286
static int ufshcd_config_vreg(struct device *dev,
		struct ufs_vreg *vreg, bool on)
{
	int ret = 0;
	struct regulator *reg = vreg->reg;
	const char *name = vreg->name;
	int min_uV, uA_load;

	BUG_ON(!vreg);

	if (regulator_count_voltages(reg) > 0) {
		min_uV = on ? vreg->min_uV : 0;
		ret = regulator_set_voltage(reg, min_uV, vreg->max_uV);
		if (ret) {
			dev_err(dev, "%s: %s set voltage failed, err=%d\n",
					__func__, name, ret);
			goto out;
		}

		uA_load = on ? vreg->max_uA : 0;
4287 4288
		ret = ufshcd_config_vreg_load(dev, vreg, uA_load);
		if (ret)
4289 4290 4291 4292 4293 4294 4295 4296 4297 4298 4299 4300 4301 4302 4303 4304 4305 4306 4307 4308 4309 4310 4311 4312 4313 4314 4315 4316 4317 4318 4319 4320 4321 4322 4323 4324 4325 4326 4327 4328 4329 4330 4331 4332 4333 4334 4335 4336 4337 4338 4339 4340 4341 4342 4343 4344 4345 4346 4347 4348 4349 4350 4351 4352 4353 4354 4355 4356 4357 4358 4359 4360 4361 4362 4363 4364 4365
			goto out;
	}
out:
	return ret;
}

static int ufshcd_enable_vreg(struct device *dev, struct ufs_vreg *vreg)
{
	int ret = 0;

	if (!vreg || vreg->enabled)
		goto out;

	ret = ufshcd_config_vreg(dev, vreg, true);
	if (!ret)
		ret = regulator_enable(vreg->reg);

	if (!ret)
		vreg->enabled = true;
	else
		dev_err(dev, "%s: %s enable failed, err=%d\n",
				__func__, vreg->name, ret);
out:
	return ret;
}

static int ufshcd_disable_vreg(struct device *dev, struct ufs_vreg *vreg)
{
	int ret = 0;

	if (!vreg || !vreg->enabled)
		goto out;

	ret = regulator_disable(vreg->reg);

	if (!ret) {
		/* ignore errors on applying disable config */
		ufshcd_config_vreg(dev, vreg, false);
		vreg->enabled = false;
	} else {
		dev_err(dev, "%s: %s disable failed, err=%d\n",
				__func__, vreg->name, ret);
	}
out:
	return ret;
}

static int ufshcd_setup_vreg(struct ufs_hba *hba, bool on)
{
	int ret = 0;
	struct device *dev = hba->dev;
	struct ufs_vreg_info *info = &hba->vreg_info;

	if (!info)
		goto out;

	ret = ufshcd_toggle_vreg(dev, info->vcc, on);
	if (ret)
		goto out;

	ret = ufshcd_toggle_vreg(dev, info->vccq, on);
	if (ret)
		goto out;

	ret = ufshcd_toggle_vreg(dev, info->vccq2, on);
	if (ret)
		goto out;

out:
	if (ret) {
		ufshcd_toggle_vreg(dev, info->vccq2, false);
		ufshcd_toggle_vreg(dev, info->vccq, false);
		ufshcd_toggle_vreg(dev, info->vcc, false);
	}
	return ret;
}

4366 4367 4368 4369 4370 4371 4372 4373 4374 4375
static int ufshcd_setup_hba_vreg(struct ufs_hba *hba, bool on)
{
	struct ufs_vreg_info *info = &hba->vreg_info;

	if (info)
		return ufshcd_toggle_vreg(hba->dev, info->vdd_hba, on);

	return 0;
}

4376 4377 4378 4379 4380 4381 4382 4383 4384 4385 4386 4387 4388 4389 4390 4391 4392 4393 4394 4395 4396 4397 4398 4399 4400 4401 4402 4403 4404 4405 4406 4407 4408 4409 4410 4411 4412 4413 4414
static int ufshcd_get_vreg(struct device *dev, struct ufs_vreg *vreg)
{
	int ret = 0;

	if (!vreg)
		goto out;

	vreg->reg = devm_regulator_get(dev, vreg->name);
	if (IS_ERR(vreg->reg)) {
		ret = PTR_ERR(vreg->reg);
		dev_err(dev, "%s: %s get failed, err=%d\n",
				__func__, vreg->name, ret);
	}
out:
	return ret;
}

static int ufshcd_init_vreg(struct ufs_hba *hba)
{
	int ret = 0;
	struct device *dev = hba->dev;
	struct ufs_vreg_info *info = &hba->vreg_info;

	if (!info)
		goto out;

	ret = ufshcd_get_vreg(dev, info->vcc);
	if (ret)
		goto out;

	ret = ufshcd_get_vreg(dev, info->vccq);
	if (ret)
		goto out;

	ret = ufshcd_get_vreg(dev, info->vccq2);
out:
	return ret;
}

4415 4416 4417 4418 4419 4420 4421 4422 4423 4424
static int ufshcd_init_hba_vreg(struct ufs_hba *hba)
{
	struct ufs_vreg_info *info = &hba->vreg_info;

	if (info)
		return ufshcd_get_vreg(hba->dev, info->vdd_hba);

	return 0;
}

4425 4426
static int __ufshcd_setup_clocks(struct ufs_hba *hba, bool on,
					bool skip_ref_clk)
4427 4428 4429 4430
{
	int ret = 0;
	struct ufs_clk_info *clki;
	struct list_head *head = &hba->clk_list_head;
4431
	unsigned long flags;
4432 4433 4434 4435 4436 4437

	if (!head || list_empty(head))
		goto out;

	list_for_each_entry(clki, head, list) {
		if (!IS_ERR_OR_NULL(clki->clk)) {
4438 4439 4440
			if (skip_ref_clk && !strcmp(clki->name, "ref_clk"))
				continue;

4441 4442 4443 4444 4445 4446 4447 4448 4449 4450 4451 4452 4453 4454 4455
			if (on && !clki->enabled) {
				ret = clk_prepare_enable(clki->clk);
				if (ret) {
					dev_err(hba->dev, "%s: %s prepare enable failed, %d\n",
						__func__, clki->name, ret);
					goto out;
				}
			} else if (!on && clki->enabled) {
				clk_disable_unprepare(clki->clk);
			}
			clki->enabled = on;
			dev_dbg(hba->dev, "%s: clk: %s %sabled\n", __func__,
					clki->name, on ? "en" : "dis");
		}
	}
4456 4457 4458

	if (hba->vops && hba->vops->setup_clocks)
		ret = hba->vops->setup_clocks(hba, on);
4459 4460 4461 4462 4463 4464
out:
	if (ret) {
		list_for_each_entry(clki, head, list) {
			if (!IS_ERR_OR_NULL(clki->clk) && clki->enabled)
				clk_disable_unprepare(clki->clk);
		}
4465
	} else if (on) {
4466 4467 4468
		spin_lock_irqsave(hba->host->host_lock, flags);
		hba->clk_gating.state = CLKS_ON;
		spin_unlock_irqrestore(hba->host->host_lock, flags);
4469 4470 4471 4472
	}
	return ret;
}

4473 4474 4475 4476 4477
static int ufshcd_setup_clocks(struct ufs_hba *hba, bool on)
{
	return  __ufshcd_setup_clocks(hba, on, false);
}

4478 4479 4480 4481 4482 4483 4484 4485 4486 4487 4488 4489 4490 4491 4492 4493 4494 4495 4496 4497 4498 4499 4500 4501 4502 4503 4504 4505 4506 4507
static int ufshcd_init_clocks(struct ufs_hba *hba)
{
	int ret = 0;
	struct ufs_clk_info *clki;
	struct device *dev = hba->dev;
	struct list_head *head = &hba->clk_list_head;

	if (!head || list_empty(head))
		goto out;

	list_for_each_entry(clki, head, list) {
		if (!clki->name)
			continue;

		clki->clk = devm_clk_get(dev, clki->name);
		if (IS_ERR(clki->clk)) {
			ret = PTR_ERR(clki->clk);
			dev_err(dev, "%s: %s clk get failed, %d\n",
					__func__, clki->name, ret);
			goto out;
		}

		if (clki->max_freq) {
			ret = clk_set_rate(clki->clk, clki->max_freq);
			if (ret) {
				dev_err(hba->dev, "%s: %s clk set rate(%dHz) failed, %d\n",
					__func__, clki->name,
					clki->max_freq, ret);
				goto out;
			}
4508
			clki->curr_freq = clki->max_freq;
4509 4510 4511 4512 4513 4514 4515 4516
		}
		dev_dbg(dev, "%s: clk: %s, rate: %lu\n", __func__,
				clki->name, clk_get_rate(clki->clk));
	}
out:
	return ret;
}

4517 4518 4519 4520 4521 4522 4523 4524 4525 4526 4527 4528 4529 4530 4531 4532
static int ufshcd_variant_hba_init(struct ufs_hba *hba)
{
	int err = 0;

	if (!hba->vops)
		goto out;

	if (hba->vops->init) {
		err = hba->vops->init(hba);
		if (err)
			goto out;
	}

	if (hba->vops->setup_regulators) {
		err = hba->vops->setup_regulators(hba, true);
		if (err)
4533
			goto out_exit;
4534 4535 4536 4537 4538 4539 4540 4541 4542 4543 4544 4545 4546 4547 4548 4549 4550 4551 4552 4553 4554 4555 4556 4557 4558 4559 4560 4561 4562
	}

	goto out;

out_exit:
	if (hba->vops->exit)
		hba->vops->exit(hba);
out:
	if (err)
		dev_err(hba->dev, "%s: variant %s init failed err %d\n",
			__func__, hba->vops ? hba->vops->name : "", err);
	return err;
}

static void ufshcd_variant_hba_exit(struct ufs_hba *hba)
{
	if (!hba->vops)
		return;

	if (hba->vops->setup_clocks)
		hba->vops->setup_clocks(hba, false);

	if (hba->vops->setup_regulators)
		hba->vops->setup_regulators(hba, false);

	if (hba->vops->exit)
		hba->vops->exit(hba);
}

4563 4564 4565 4566
static int ufshcd_hba_init(struct ufs_hba *hba)
{
	int err;

4567 4568 4569 4570 4571 4572 4573 4574
	/*
	 * Handle host controller power separately from the UFS device power
	 * rails as it will help controlling the UFS host controller power
	 * collapse easily which is different than UFS device power collapse.
	 * Also, enable the host controller power before we go ahead with rest
	 * of the initialization here.
	 */
	err = ufshcd_init_hba_vreg(hba);
4575 4576 4577
	if (err)
		goto out;

4578
	err = ufshcd_setup_hba_vreg(hba, true);
4579 4580 4581
	if (err)
		goto out;

4582 4583 4584 4585 4586 4587 4588 4589
	err = ufshcd_init_clocks(hba);
	if (err)
		goto out_disable_hba_vreg;

	err = ufshcd_setup_clocks(hba, true);
	if (err)
		goto out_disable_hba_vreg;

4590 4591 4592 4593 4594 4595 4596 4597
	err = ufshcd_init_vreg(hba);
	if (err)
		goto out_disable_clks;

	err = ufshcd_setup_vreg(hba, true);
	if (err)
		goto out_disable_clks;

4598 4599 4600 4601
	err = ufshcd_variant_hba_init(hba);
	if (err)
		goto out_disable_vreg;

S
Sujit Reddy Thumma 已提交
4602
	hba->is_powered = true;
4603 4604 4605 4606
	goto out;

out_disable_vreg:
	ufshcd_setup_vreg(hba, false);
4607 4608
out_disable_clks:
	ufshcd_setup_clocks(hba, false);
4609 4610
out_disable_hba_vreg:
	ufshcd_setup_hba_vreg(hba, false);
4611 4612 4613 4614 4615 4616
out:
	return err;
}

static void ufshcd_hba_exit(struct ufs_hba *hba)
{
S
Sujit Reddy Thumma 已提交
4617 4618 4619 4620 4621 4622 4623
	if (hba->is_powered) {
		ufshcd_variant_hba_exit(hba);
		ufshcd_setup_vreg(hba, false);
		ufshcd_setup_clocks(hba, false);
		ufshcd_setup_hba_vreg(hba, false);
		hba->is_powered = false;
	}
4624 4625
}

4626 4627 4628 4629 4630 4631 4632 4633 4634 4635 4636 4637 4638 4639 4640 4641 4642 4643 4644 4645 4646 4647 4648 4649 4650 4651 4652 4653 4654 4655 4656 4657 4658 4659 4660 4661 4662 4663 4664 4665 4666 4667 4668
static int
ufshcd_send_request_sense(struct ufs_hba *hba, struct scsi_device *sdp)
{
	unsigned char cmd[6] = {REQUEST_SENSE,
				0,
				0,
				0,
				SCSI_SENSE_BUFFERSIZE,
				0};
	char *buffer;
	int ret;

	buffer = kzalloc(SCSI_SENSE_BUFFERSIZE, GFP_KERNEL);
	if (!buffer) {
		ret = -ENOMEM;
		goto out;
	}

	ret = scsi_execute_req_flags(sdp, cmd, DMA_FROM_DEVICE, buffer,
				SCSI_SENSE_BUFFERSIZE, NULL,
				msecs_to_jiffies(1000), 3, NULL, REQ_PM);
	if (ret)
		pr_err("%s: failed with err %d\n", __func__, ret);

	kfree(buffer);
out:
	return ret;
}

/**
 * ufshcd_set_dev_pwr_mode - sends START STOP UNIT command to set device
 *			     power mode
 * @hba: per adapter instance
 * @pwr_mode: device power mode to set
 *
 * Returns 0 if requested power mode is set successfully
 * Returns non-zero if failed to set the requested power mode
 */
static int ufshcd_set_dev_pwr_mode(struct ufs_hba *hba,
				     enum ufs_dev_pwr_mode pwr_mode)
{
	unsigned char cmd[6] = { START_STOP };
	struct scsi_sense_hdr sshdr;
4669 4670
	struct scsi_device *sdp;
	unsigned long flags;
4671 4672
	int ret;

4673 4674 4675 4676 4677 4678 4679 4680 4681 4682 4683 4684 4685 4686 4687
	spin_lock_irqsave(hba->host->host_lock, flags);
	sdp = hba->sdev_ufs_device;
	if (sdp) {
		ret = scsi_device_get(sdp);
		if (!ret && !scsi_device_online(sdp)) {
			ret = -ENODEV;
			scsi_device_put(sdp);
		}
	} else {
		ret = -ENODEV;
	}
	spin_unlock_irqrestore(hba->host->host_lock, flags);

	if (ret)
		return ret;
4688 4689 4690 4691 4692 4693 4694 4695 4696 4697 4698 4699 4700 4701 4702 4703 4704 4705 4706 4707 4708 4709 4710 4711 4712 4713 4714

	/*
	 * If scsi commands fail, the scsi mid-layer schedules scsi error-
	 * handling, which would wait for host to be resumed. Since we know
	 * we are functional while we are here, skip host resume in error
	 * handling context.
	 */
	hba->host->eh_noresume = 1;
	if (hba->wlun_dev_clr_ua) {
		ret = ufshcd_send_request_sense(hba, sdp);
		if (ret)
			goto out;
		/* Unit attention condition is cleared now */
		hba->wlun_dev_clr_ua = false;
	}

	cmd[4] = pwr_mode << 4;

	/*
	 * Current function would be generally called from the power management
	 * callbacks hence set the REQ_PM flag so that it doesn't resume the
	 * already suspended childs.
	 */
	ret = scsi_execute_req_flags(sdp, cmd, DMA_NONE, NULL, 0, &sshdr,
				     START_STOP_TIMEOUT, 0, NULL, REQ_PM);
	if (ret) {
		sdev_printk(KERN_WARNING, sdp,
H
Hannes Reinecke 已提交
4715 4716
			    "START_STOP failed for power mode: %d, result %x\n",
			    pwr_mode, ret);
4717 4718
		if (driver_byte(ret) & DRIVER_SENSE)
			scsi_print_sense_hdr(sdp, NULL, &sshdr);
4719 4720 4721 4722 4723
	}

	if (!ret)
		hba->curr_dev_pwr_mode = pwr_mode;
out:
4724
	scsi_device_put(sdp);
4725 4726 4727 4728 4729 4730 4731 4732 4733 4734 4735 4736 4737 4738 4739 4740 4741 4742 4743 4744 4745 4746 4747 4748 4749 4750 4751 4752 4753 4754 4755 4756 4757 4758 4759 4760 4761 4762 4763 4764 4765 4766 4767 4768 4769 4770 4771 4772 4773 4774 4775 4776 4777 4778 4779 4780 4781 4782 4783 4784 4785 4786 4787 4788 4789 4790 4791 4792 4793 4794 4795 4796 4797 4798 4799 4800 4801 4802 4803 4804 4805 4806 4807 4808 4809 4810 4811 4812 4813 4814 4815 4816 4817 4818 4819 4820 4821 4822 4823 4824 4825 4826 4827 4828 4829 4830 4831 4832 4833
	hba->host->eh_noresume = 0;
	return ret;
}

static int ufshcd_link_state_transition(struct ufs_hba *hba,
					enum uic_link_state req_link_state,
					int check_for_bkops)
{
	int ret = 0;

	if (req_link_state == hba->uic_link_state)
		return 0;

	if (req_link_state == UIC_LINK_HIBERN8_STATE) {
		ret = ufshcd_uic_hibern8_enter(hba);
		if (!ret)
			ufshcd_set_link_hibern8(hba);
		else
			goto out;
	}
	/*
	 * If autobkops is enabled, link can't be turned off because
	 * turning off the link would also turn off the device.
	 */
	else if ((req_link_state == UIC_LINK_OFF_STATE) &&
		   (!check_for_bkops || (check_for_bkops &&
		    !hba->auto_bkops_enabled))) {
		/*
		 * Change controller state to "reset state" which
		 * should also put the link in off/reset state
		 */
		ufshcd_hba_stop(hba);
		/*
		 * TODO: Check if we need any delay to make sure that
		 * controller is reset
		 */
		ufshcd_set_link_off(hba);
	}

out:
	return ret;
}

static void ufshcd_vreg_set_lpm(struct ufs_hba *hba)
{
	/*
	 * If UFS device is either in UFS_Sleep turn off VCC rail to save some
	 * power.
	 *
	 * If UFS device and link is in OFF state, all power supplies (VCC,
	 * VCCQ, VCCQ2) can be turned off if power on write protect is not
	 * required. If UFS link is inactive (Hibern8 or OFF state) and device
	 * is in sleep state, put VCCQ & VCCQ2 rails in LPM mode.
	 *
	 * Ignore the error returned by ufshcd_toggle_vreg() as device is anyway
	 * in low power state which would save some power.
	 */
	if (ufshcd_is_ufs_dev_poweroff(hba) && ufshcd_is_link_off(hba) &&
	    !hba->dev_info.is_lu_power_on_wp) {
		ufshcd_setup_vreg(hba, false);
	} else if (!ufshcd_is_ufs_dev_active(hba)) {
		ufshcd_toggle_vreg(hba->dev, hba->vreg_info.vcc, false);
		if (!ufshcd_is_link_active(hba)) {
			ufshcd_config_vreg_lpm(hba, hba->vreg_info.vccq);
			ufshcd_config_vreg_lpm(hba, hba->vreg_info.vccq2);
		}
	}
}

static int ufshcd_vreg_set_hpm(struct ufs_hba *hba)
{
	int ret = 0;

	if (ufshcd_is_ufs_dev_poweroff(hba) && ufshcd_is_link_off(hba) &&
	    !hba->dev_info.is_lu_power_on_wp) {
		ret = ufshcd_setup_vreg(hba, true);
	} else if (!ufshcd_is_ufs_dev_active(hba)) {
		ret = ufshcd_toggle_vreg(hba->dev, hba->vreg_info.vcc, true);
		if (!ret && !ufshcd_is_link_active(hba)) {
			ret = ufshcd_config_vreg_hpm(hba, hba->vreg_info.vccq);
			if (ret)
				goto vcc_disable;
			ret = ufshcd_config_vreg_hpm(hba, hba->vreg_info.vccq2);
			if (ret)
				goto vccq_lpm;
		}
	}
	goto out;

vccq_lpm:
	ufshcd_config_vreg_lpm(hba, hba->vreg_info.vccq);
vcc_disable:
	ufshcd_toggle_vreg(hba->dev, hba->vreg_info.vcc, false);
out:
	return ret;
}

static void ufshcd_hba_vreg_set_lpm(struct ufs_hba *hba)
{
	if (ufshcd_is_link_off(hba))
		ufshcd_setup_hba_vreg(hba, false);
}

static void ufshcd_hba_vreg_set_hpm(struct ufs_hba *hba)
{
	if (ufshcd_is_link_off(hba))
		ufshcd_setup_hba_vreg(hba, true);
}

4834
/**
4835
 * ufshcd_suspend - helper function for suspend operations
4836
 * @hba: per adapter instance
4837 4838 4839 4840 4841 4842 4843 4844
 * @pm_op: desired low power operation type
 *
 * This function will try to put the UFS device and link into low power
 * mode based on the "rpm_lvl" (Runtime PM level) or "spm_lvl"
 * (System PM level).
 *
 * If this function is called during shutdown, it will make sure that
 * both UFS device and UFS link is powered off.
4845
 *
4846 4847 4848
 * NOTE: UFS device & link must be active before we enter in this function.
 *
 * Returns 0 for success and non-zero for failure
4849
 */
4850
static int ufshcd_suspend(struct ufs_hba *hba, enum ufs_pm_op pm_op)
4851
{
4852 4853 4854 4855 4856 4857 4858 4859 4860 4861 4862 4863 4864 4865 4866 4867
	int ret = 0;
	enum ufs_pm_level pm_lvl;
	enum ufs_dev_pwr_mode req_dev_pwr_mode;
	enum uic_link_state req_link_state;

	hba->pm_op_in_progress = 1;
	if (!ufshcd_is_shutdown_pm(pm_op)) {
		pm_lvl = ufshcd_is_runtime_pm(pm_op) ?
			 hba->rpm_lvl : hba->spm_lvl;
		req_dev_pwr_mode = ufs_get_pm_lvl_to_dev_pwr_mode(pm_lvl);
		req_link_state = ufs_get_pm_lvl_to_link_pwr_state(pm_lvl);
	} else {
		req_dev_pwr_mode = UFS_POWERDOWN_PWR_MODE;
		req_link_state = UIC_LINK_OFF_STATE;
	}

4868
	/*
4869 4870
	 * If we can't transition into any of the low power modes
	 * just gate the clocks.
4871
	 */
4872 4873 4874
	ufshcd_hold(hba, false);
	hba->clk_gating.is_suspended = true;

4875 4876 4877 4878
	if (req_dev_pwr_mode == UFS_ACTIVE_PWR_MODE &&
			req_link_state == UIC_LINK_ACTIVE_STATE) {
		goto disable_clks;
	}
4879

4880 4881 4882 4883 4884 4885 4886 4887 4888 4889 4890
	if ((req_dev_pwr_mode == hba->curr_dev_pwr_mode) &&
	    (req_link_state == hba->uic_link_state))
		goto out;

	/* UFS device & link must be active before we enter in this function */
	if (!ufshcd_is_ufs_dev_active(hba) || !ufshcd_is_link_active(hba)) {
		ret = -EINVAL;
		goto out;
	}

	if (ufshcd_is_runtime_pm(pm_op)) {
4891 4892 4893 4894 4895 4896 4897 4898 4899 4900 4901 4902 4903
		if (ufshcd_can_autobkops_during_suspend(hba)) {
			/*
			 * The device is idle with no requests in the queue,
			 * allow background operations if bkops status shows
			 * that performance might be impacted.
			 */
			ret = ufshcd_urgent_bkops(hba);
			if (ret)
				goto enable_gating;
		} else {
			/* make sure that auto bkops is disabled */
			ufshcd_disable_auto_bkops(hba);
		}
4904 4905 4906 4907 4908 4909 4910 4911 4912
	}

	if ((req_dev_pwr_mode != hba->curr_dev_pwr_mode) &&
	     ((ufshcd_is_runtime_pm(pm_op) && !hba->auto_bkops_enabled) ||
	       !ufshcd_is_runtime_pm(pm_op))) {
		/* ensure that bkops is disabled */
		ufshcd_disable_auto_bkops(hba);
		ret = ufshcd_set_dev_pwr_mode(hba, req_dev_pwr_mode);
		if (ret)
4913
			goto enable_gating;
4914 4915 4916 4917 4918 4919 4920 4921 4922
	}

	ret = ufshcd_link_state_transition(hba, req_link_state, 1);
	if (ret)
		goto set_dev_active;

	ufshcd_vreg_set_lpm(hba);

disable_clks:
4923 4924 4925 4926 4927 4928 4929 4930 4931
	/*
	 * The clock scaling needs access to controller registers. Hence, Wait
	 * for pending clock scaling work to be done before clocks are
	 * turned off.
	 */
	if (ufshcd_is_clkscaling_enabled(hba)) {
		devfreq_suspend_device(hba->devfreq);
		hba->clk_scaling.window_start_t = 0;
	}
4932 4933 4934 4935 4936 4937 4938 4939 4940 4941 4942 4943 4944 4945 4946 4947 4948 4949 4950 4951 4952 4953 4954
	/*
	 * Call vendor specific suspend callback. As these callbacks may access
	 * vendor specific host controller register space call them before the
	 * host clocks are ON.
	 */
	if (hba->vops && hba->vops->suspend) {
		ret = hba->vops->suspend(hba, pm_op);
		if (ret)
			goto set_link_active;
	}

	if (hba->vops && hba->vops->setup_clocks) {
		ret = hba->vops->setup_clocks(hba, false);
		if (ret)
			goto vops_resume;
	}

	if (!ufshcd_is_link_active(hba))
		ufshcd_setup_clocks(hba, false);
	else
		/* If link is active, device ref_clk can't be switched off */
		__ufshcd_setup_clocks(hba, false, true);

4955
	hba->clk_gating.state = CLKS_OFF;
4956 4957 4958 4959 4960 4961 4962 4963 4964 4965 4966 4967 4968 4969 4970 4971 4972 4973 4974 4975 4976
	/*
	 * Disable the host irq as host controller as there won't be any
	 * host controller trasanction expected till resume.
	 */
	ufshcd_disable_irq(hba);
	/* Put the host controller in low power mode if possible */
	ufshcd_hba_vreg_set_lpm(hba);
	goto out;

vops_resume:
	if (hba->vops && hba->vops->resume)
		hba->vops->resume(hba, pm_op);
set_link_active:
	ufshcd_vreg_set_hpm(hba);
	if (ufshcd_is_link_hibern8(hba) && !ufshcd_uic_hibern8_exit(hba))
		ufshcd_set_link_active(hba);
	else if (ufshcd_is_link_off(hba))
		ufshcd_host_reset_and_restore(hba);
set_dev_active:
	if (!ufshcd_set_dev_pwr_mode(hba, UFS_ACTIVE_PWR_MODE))
		ufshcd_disable_auto_bkops(hba);
4977 4978 4979
enable_gating:
	hba->clk_gating.is_suspended = false;
	ufshcd_release(hba);
4980 4981 4982
out:
	hba->pm_op_in_progress = 0;
	return ret;
4983 4984 4985
}

/**
4986
 * ufshcd_resume - helper function for resume operations
4987
 * @hba: per adapter instance
4988
 * @pm_op: runtime PM or system PM
4989
 *
4990 4991 4992 4993
 * This function basically brings the UFS device, UniPro link and controller
 * to active state.
 *
 * Returns 0 for success and non-zero for failure
4994
 */
4995
static int ufshcd_resume(struct ufs_hba *hba, enum ufs_pm_op pm_op)
4996
{
4997 4998 4999 5000 5001 5002 5003 5004 5005 5006 5007 5008 5009 5010 5011 5012 5013 5014 5015 5016 5017
	int ret;
	enum uic_link_state old_link_state;

	hba->pm_op_in_progress = 1;
	old_link_state = hba->uic_link_state;

	ufshcd_hba_vreg_set_hpm(hba);
	/* Make sure clocks are enabled before accessing controller */
	ret = ufshcd_setup_clocks(hba, true);
	if (ret)
		goto out;

	/* enable the host irq as host controller would be active soon */
	ret = ufshcd_enable_irq(hba);
	if (ret)
		goto disable_irq_and_vops_clks;

	ret = ufshcd_vreg_set_hpm(hba);
	if (ret)
		goto disable_irq_and_vops_clks;

5018
	/*
5019 5020 5021
	 * Call vendor specific resume callback. As these callbacks may access
	 * vendor specific host controller register space call them when the
	 * host clocks are ON.
5022
	 */
5023 5024 5025 5026 5027 5028 5029 5030 5031 5032 5033 5034 5035 5036 5037 5038 5039 5040 5041 5042 5043 5044 5045 5046 5047 5048 5049 5050
	if (hba->vops && hba->vops->resume) {
		ret = hba->vops->resume(hba, pm_op);
		if (ret)
			goto disable_vreg;
	}

	if (ufshcd_is_link_hibern8(hba)) {
		ret = ufshcd_uic_hibern8_exit(hba);
		if (!ret)
			ufshcd_set_link_active(hba);
		else
			goto vendor_suspend;
	} else if (ufshcd_is_link_off(hba)) {
		ret = ufshcd_host_reset_and_restore(hba);
		/*
		 * ufshcd_host_reset_and_restore() should have already
		 * set the link state as active
		 */
		if (ret || !ufshcd_is_link_active(hba))
			goto vendor_suspend;
	}

	if (!ufshcd_is_ufs_dev_active(hba)) {
		ret = ufshcd_set_dev_pwr_mode(hba, UFS_ACTIVE_PWR_MODE);
		if (ret)
			goto set_old_link_state;
	}

5051 5052 5053 5054 5055
	/*
	 * If BKOPs operations are urgently needed at this moment then
	 * keep auto-bkops enabled or else disable it.
	 */
	ufshcd_urgent_bkops(hba);
5056 5057
	hba->clk_gating.is_suspended = false;

5058 5059 5060
	if (ufshcd_is_clkscaling_enabled(hba))
		devfreq_resume_device(hba->devfreq);

5061 5062
	/* Schedule clock gating in case of no access to UFS device yet */
	ufshcd_release(hba);
5063 5064 5065 5066 5067 5068 5069 5070 5071 5072 5073 5074 5075 5076 5077 5078 5079 5080 5081 5082 5083 5084 5085 5086 5087 5088 5089 5090 5091 5092 5093
	goto out;

set_old_link_state:
	ufshcd_link_state_transition(hba, old_link_state, 0);
vendor_suspend:
	if (hba->vops && hba->vops->suspend)
		hba->vops->suspend(hba, pm_op);
disable_vreg:
	ufshcd_vreg_set_lpm(hba);
disable_irq_and_vops_clks:
	ufshcd_disable_irq(hba);
	ufshcd_setup_clocks(hba, false);
out:
	hba->pm_op_in_progress = 0;
	return ret;
}

/**
 * ufshcd_system_suspend - system suspend routine
 * @hba: per adapter instance
 * @pm_op: runtime PM or system PM
 *
 * Check the description of ufshcd_suspend() function for more details.
 *
 * Returns 0 for success and non-zero for failure
 */
int ufshcd_system_suspend(struct ufs_hba *hba)
{
	int ret = 0;

	if (!hba || !hba->is_powered)
5094
		return 0;
5095 5096 5097 5098 5099 5100 5101 5102 5103 5104 5105 5106 5107 5108 5109 5110 5111 5112 5113 5114 5115 5116 5117 5118 5119 5120

	if (pm_runtime_suspended(hba->dev)) {
		if (hba->rpm_lvl == hba->spm_lvl)
			/*
			 * There is possibility that device may still be in
			 * active state during the runtime suspend.
			 */
			if ((ufs_get_pm_lvl_to_dev_pwr_mode(hba->spm_lvl) ==
			    hba->curr_dev_pwr_mode) && !hba->auto_bkops_enabled)
				goto out;

		/*
		 * UFS device and/or UFS link low power states during runtime
		 * suspend seems to be different than what is expected during
		 * system suspend. Hence runtime resume the devic & link and
		 * let the system suspend low power states to take effect.
		 * TODO: If resume takes longer time, we might have optimize
		 * it in future by not resuming everything if possible.
		 */
		ret = ufshcd_runtime_resume(hba);
		if (ret)
			goto out;
	}

	ret = ufshcd_suspend(hba, UFS_SYSTEM_PM);
out:
D
Dolev Raviv 已提交
5121 5122
	if (!ret)
		hba->is_sys_suspended = true;
5123 5124 5125 5126 5127 5128 5129 5130 5131 5132
	return ret;
}
EXPORT_SYMBOL(ufshcd_system_suspend);

/**
 * ufshcd_system_resume - system resume routine
 * @hba: per adapter instance
 *
 * Returns 0 for success and non-zero for failure
 */
5133

5134 5135 5136 5137 5138 5139 5140 5141 5142 5143
int ufshcd_system_resume(struct ufs_hba *hba)
{
	if (!hba || !hba->is_powered || pm_runtime_suspended(hba->dev))
		/*
		 * Let the runtime resume take care of resuming
		 * if runtime suspended.
		 */
		return 0;

	return ufshcd_resume(hba, UFS_SYSTEM_PM);
5144
}
5145
EXPORT_SYMBOL(ufshcd_system_resume);
5146

5147 5148 5149 5150 5151 5152 5153 5154
/**
 * ufshcd_runtime_suspend - runtime suspend routine
 * @hba: per adapter instance
 *
 * Check the description of ufshcd_suspend() function for more details.
 *
 * Returns 0 for success and non-zero for failure
 */
5155 5156
int ufshcd_runtime_suspend(struct ufs_hba *hba)
{
5157
	if (!hba || !hba->is_powered)
5158 5159
		return 0;

5160
	return ufshcd_suspend(hba, UFS_RUNTIME_PM);
5161 5162 5163
}
EXPORT_SYMBOL(ufshcd_runtime_suspend);

5164 5165 5166 5167 5168 5169 5170 5171 5172 5173 5174 5175 5176 5177 5178 5179 5180 5181 5182 5183 5184
/**
 * ufshcd_runtime_resume - runtime resume routine
 * @hba: per adapter instance
 *
 * This function basically brings the UFS device, UniPro link and controller
 * to active state. Following operations are done in this function:
 *
 * 1. Turn on all the controller related clocks
 * 2. Bring the UniPro link out of Hibernate state
 * 3. If UFS device is in sleep state, turn ON VCC rail and bring the UFS device
 *    to active state.
 * 4. If auto-bkops is enabled on the device, disable it.
 *
 * So following would be the possible power state after this function return
 * successfully:
 *	S1: UFS device in Active state with VCC rail ON
 *	    UniPro link in Active state
 *	    All the UFS/UniPro controller clocks are ON
 *
 * Returns 0 for success and non-zero for failure
 */
5185 5186
int ufshcd_runtime_resume(struct ufs_hba *hba)
{
5187
	if (!hba || !hba->is_powered)
5188
		return 0;
5189 5190
	else
		return ufshcd_resume(hba, UFS_RUNTIME_PM);
5191 5192 5193 5194 5195 5196 5197 5198 5199
}
EXPORT_SYMBOL(ufshcd_runtime_resume);

int ufshcd_runtime_idle(struct ufs_hba *hba)
{
	return 0;
}
EXPORT_SYMBOL(ufshcd_runtime_idle);

5200 5201 5202 5203 5204 5205 5206 5207 5208 5209 5210 5211 5212 5213 5214 5215 5216 5217 5218 5219 5220 5221 5222 5223 5224 5225 5226 5227 5228 5229
/**
 * ufshcd_shutdown - shutdown routine
 * @hba: per adapter instance
 *
 * This function would power off both UFS device and UFS link.
 *
 * Returns 0 always to allow force shutdown even in case of errors.
 */
int ufshcd_shutdown(struct ufs_hba *hba)
{
	int ret = 0;

	if (ufshcd_is_ufs_dev_poweroff(hba) && ufshcd_is_link_off(hba))
		goto out;

	if (pm_runtime_suspended(hba->dev)) {
		ret = ufshcd_runtime_resume(hba);
		if (ret)
			goto out;
	}

	ret = ufshcd_suspend(hba, UFS_SHUTDOWN_PM);
out:
	if (ret)
		dev_err(hba->dev, "%s failed, err %d\n", __func__, ret);
	/* allow force shutdown even in case of errors */
	return 0;
}
EXPORT_SYMBOL(ufshcd_shutdown);

5230
/**
5231
 * ufshcd_remove - de-allocate SCSI host and host memory space
5232
 *		data structure memory
5233
 * @hba - per adapter instance
5234
 */
5235
void ufshcd_remove(struct ufs_hba *hba)
5236
{
5237
	scsi_remove_host(hba->host);
5238
	/* disable interrupts */
5239
	ufshcd_disable_intr(hba, hba->intr_mask);
5240 5241 5242
	ufshcd_hba_stop(hba);

	scsi_host_put(hba->host);
5243

5244
	ufshcd_exit_clk_gating(hba);
5245 5246
	if (ufshcd_is_clkscaling_enabled(hba))
		devfreq_remove_device(hba->devfreq);
5247
	ufshcd_hba_exit(hba);
5248 5249 5250
}
EXPORT_SYMBOL_GPL(ufshcd_remove);

A
Akinobu Mita 已提交
5251 5252 5253 5254 5255 5256 5257 5258 5259 5260 5261 5262 5263 5264 5265 5266
/**
 * ufshcd_set_dma_mask - Set dma mask based on the controller
 *			 addressing capability
 * @hba: per adapter instance
 *
 * Returns 0 for success, non-zero for failure
 */
static int ufshcd_set_dma_mask(struct ufs_hba *hba)
{
	if (hba->capabilities & MASK_64_ADDRESSING_SUPPORT) {
		if (!dma_set_mask_and_coherent(hba->dev, DMA_BIT_MASK(64)))
			return 0;
	}
	return dma_set_mask_and_coherent(hba->dev, DMA_BIT_MASK(32));
}

5267
/**
5268
 * ufshcd_alloc_host - allocate Host Bus Adapter (HBA)
5269 5270
 * @dev: pointer to device handle
 * @hba_handle: driver private handle
5271 5272
 * Returns 0 on success, non-zero value on failure
 */
5273
int ufshcd_alloc_host(struct device *dev, struct ufs_hba **hba_handle)
5274 5275 5276
{
	struct Scsi_Host *host;
	struct ufs_hba *hba;
5277
	int err = 0;
5278

5279 5280 5281 5282
	if (!dev) {
		dev_err(dev,
		"Invalid memory reference for dev is NULL\n");
		err = -ENODEV;
5283 5284 5285 5286 5287 5288
		goto out_error;
	}

	host = scsi_host_alloc(&ufshcd_driver_template,
				sizeof(struct ufs_hba));
	if (!host) {
5289
		dev_err(dev, "scsi_host_alloc failed\n");
5290
		err = -ENOMEM;
5291
		goto out_error;
5292 5293 5294
	}
	hba = shost_priv(host);
	hba->host = host;
5295
	hba->dev = dev;
5296 5297 5298 5299 5300 5301 5302
	*hba_handle = hba;

out_error:
	return err;
}
EXPORT_SYMBOL(ufshcd_alloc_host);

5303 5304 5305 5306 5307 5308 5309 5310 5311 5312 5313 5314 5315 5316 5317 5318 5319 5320 5321 5322 5323 5324 5325 5326 5327 5328 5329 5330 5331 5332 5333 5334 5335 5336 5337 5338 5339 5340 5341 5342 5343 5344 5345 5346 5347 5348 5349 5350 5351 5352 5353 5354 5355 5356 5357 5358 5359 5360 5361 5362 5363 5364 5365 5366 5367 5368 5369 5370 5371 5372 5373 5374 5375 5376 5377 5378 5379 5380 5381 5382 5383 5384 5385 5386 5387 5388 5389 5390 5391 5392 5393 5394 5395 5396 5397 5398 5399 5400 5401 5402 5403 5404 5405 5406 5407 5408
static int ufshcd_scale_clks(struct ufs_hba *hba, bool scale_up)
{
	int ret = 0;
	struct ufs_clk_info *clki;
	struct list_head *head = &hba->clk_list_head;

	if (!head || list_empty(head))
		goto out;

	list_for_each_entry(clki, head, list) {
		if (!IS_ERR_OR_NULL(clki->clk)) {
			if (scale_up && clki->max_freq) {
				if (clki->curr_freq == clki->max_freq)
					continue;
				ret = clk_set_rate(clki->clk, clki->max_freq);
				if (ret) {
					dev_err(hba->dev, "%s: %s clk set rate(%dHz) failed, %d\n",
						__func__, clki->name,
						clki->max_freq, ret);
					break;
				}
				clki->curr_freq = clki->max_freq;

			} else if (!scale_up && clki->min_freq) {
				if (clki->curr_freq == clki->min_freq)
					continue;
				ret = clk_set_rate(clki->clk, clki->min_freq);
				if (ret) {
					dev_err(hba->dev, "%s: %s clk set rate(%dHz) failed, %d\n",
						__func__, clki->name,
						clki->min_freq, ret);
					break;
				}
				clki->curr_freq = clki->min_freq;
			}
		}
		dev_dbg(hba->dev, "%s: clk: %s, rate: %lu\n", __func__,
				clki->name, clk_get_rate(clki->clk));
	}
	if (hba->vops->clk_scale_notify)
		hba->vops->clk_scale_notify(hba);
out:
	return ret;
}

static int ufshcd_devfreq_target(struct device *dev,
				unsigned long *freq, u32 flags)
{
	int err = 0;
	struct ufs_hba *hba = dev_get_drvdata(dev);

	if (!ufshcd_is_clkscaling_enabled(hba))
		return -EINVAL;

	if (*freq == UINT_MAX)
		err = ufshcd_scale_clks(hba, true);
	else if (*freq == 0)
		err = ufshcd_scale_clks(hba, false);

	return err;
}

static int ufshcd_devfreq_get_dev_status(struct device *dev,
		struct devfreq_dev_status *stat)
{
	struct ufs_hba *hba = dev_get_drvdata(dev);
	struct ufs_clk_scaling *scaling = &hba->clk_scaling;
	unsigned long flags;

	if (!ufshcd_is_clkscaling_enabled(hba))
		return -EINVAL;

	memset(stat, 0, sizeof(*stat));

	spin_lock_irqsave(hba->host->host_lock, flags);
	if (!scaling->window_start_t)
		goto start_window;

	if (scaling->is_busy_started)
		scaling->tot_busy_t += ktime_to_us(ktime_sub(ktime_get(),
					scaling->busy_start_t));

	stat->total_time = jiffies_to_usecs((long)jiffies -
				(long)scaling->window_start_t);
	stat->busy_time = scaling->tot_busy_t;
start_window:
	scaling->window_start_t = jiffies;
	scaling->tot_busy_t = 0;

	if (hba->outstanding_reqs) {
		scaling->busy_start_t = ktime_get();
		scaling->is_busy_started = true;
	} else {
		scaling->busy_start_t = ktime_set(0, 0);
		scaling->is_busy_started = false;
	}
	spin_unlock_irqrestore(hba->host->host_lock, flags);
	return 0;
}

static struct devfreq_dev_profile ufs_devfreq_profile = {
	.polling_ms	= 100,
	.target		= ufshcd_devfreq_target,
	.get_dev_status	= ufshcd_devfreq_get_dev_status,
};

5409 5410 5411 5412 5413 5414 5415 5416 5417 5418 5419 5420 5421 5422 5423 5424 5425 5426 5427 5428
/**
 * ufshcd_init - Driver initialization routine
 * @hba: per-adapter instance
 * @mmio_base: base register address
 * @irq: Interrupt line of device
 * Returns 0 on success, non-zero value on failure
 */
int ufshcd_init(struct ufs_hba *hba, void __iomem *mmio_base, unsigned int irq)
{
	int err;
	struct Scsi_Host *host = hba->host;
	struct device *dev = hba->dev;

	if (!mmio_base) {
		dev_err(hba->dev,
		"Invalid memory reference for mmio_base is NULL\n");
		err = -ENODEV;
		goto out_error;
	}

5429 5430
	hba->mmio_base = mmio_base;
	hba->irq = irq;
5431

5432
	err = ufshcd_hba_init(hba);
5433 5434 5435
	if (err)
		goto out_error;

5436 5437 5438 5439 5440 5441
	/* Read capabilities registers */
	ufshcd_hba_capabilities(hba);

	/* Get UFS version supported by the controller */
	hba->ufs_version = ufshcd_get_ufs_version(hba);

5442 5443 5444
	/* Get Interrupt bit mask per version */
	hba->intr_mask = ufshcd_get_intr_mask(hba);

A
Akinobu Mita 已提交
5445 5446 5447 5448 5449 5450
	err = ufshcd_set_dma_mask(hba);
	if (err) {
		dev_err(hba->dev, "set dma mask failed\n");
		goto out_disable;
	}

5451 5452 5453
	/* Allocate memory for host memory space */
	err = ufshcd_memory_alloc(hba);
	if (err) {
5454 5455
		dev_err(hba->dev, "Memory allocation failed\n");
		goto out_disable;
5456 5457 5458 5459 5460 5461 5462 5463
	}

	/* Configure LRB */
	ufshcd_host_memory_configure(hba);

	host->can_queue = hba->nutrs;
	host->cmd_per_lun = hba->nutrs;
	host->max_id = UFSHCD_MAX_ID;
5464
	host->max_lun = UFS_MAX_LUNS;
5465 5466 5467 5468
	host->max_channel = UFSHCD_MAX_CHANNEL;
	host->unique_id = host->host_no;
	host->max_cmd_len = MAX_CDB_SIZE;

D
Dolev Raviv 已提交
5469 5470
	hba->max_pwr_info.is_valid = false;

5471
	/* Initailize wait queue for task management */
5472 5473
	init_waitqueue_head(&hba->tm_wq);
	init_waitqueue_head(&hba->tm_tag_wq);
5474 5475

	/* Initialize work queues */
5476
	INIT_WORK(&hba->eh_work, ufshcd_err_handler);
5477
	INIT_WORK(&hba->eeh_work, ufshcd_exception_event_handler);
5478

5479 5480 5481
	/* Initialize UIC command mutex */
	mutex_init(&hba->uic_cmd_mutex);

5482 5483 5484 5485 5486 5487
	/* Initialize mutex for device management commands */
	mutex_init(&hba->dev_cmd.lock);

	/* Initialize device management tag acquire wait queue */
	init_waitqueue_head(&hba->dev_cmd.tag_wq);

5488
	ufshcd_init_clk_gating(hba);
5489
	/* IRQ registration */
5490
	err = devm_request_irq(dev, irq, ufshcd_intr, IRQF_SHARED, UFSHCD, hba);
5491
	if (err) {
5492
		dev_err(hba->dev, "request irq failed\n");
5493
		goto exit_gating;
5494 5495
	} else {
		hba->is_irq_enabled = true;
5496 5497 5498 5499 5500
	}

	/* Enable SCSI tag mapping */
	err = scsi_init_shared_tag_map(host, host->can_queue);
	if (err) {
5501
		dev_err(hba->dev, "init shared queue failed\n");
5502
		goto exit_gating;
5503 5504
	}

5505
	err = scsi_add_host(host, hba->dev);
5506
	if (err) {
5507
		dev_err(hba->dev, "scsi_add_host failed\n");
5508
		goto exit_gating;
5509 5510
	}

5511 5512
	/* Host controller enable */
	err = ufshcd_hba_enable(hba);
5513
	if (err) {
5514
		dev_err(hba->dev, "Host controller enable failed\n");
5515
		goto out_remove_scsi_host;
5516
	}
5517

5518 5519 5520 5521 5522 5523 5524 5525 5526 5527 5528 5529 5530
	if (ufshcd_is_clkscaling_enabled(hba)) {
		hba->devfreq = devfreq_add_device(dev, &ufs_devfreq_profile,
						   "simple_ondemand", NULL);
		if (IS_ERR(hba->devfreq)) {
			dev_err(hba->dev, "Unable to register with devfreq %ld\n",
					PTR_ERR(hba->devfreq));
			goto out_remove_scsi_host;
		}
		/* Suspend devfreq until the UFS device is detected */
		devfreq_suspend_device(hba->devfreq);
		hba->clk_scaling.window_start_t = 0;
	}

5531 5532 5533
	/* Hold auto suspend until async scan completes */
	pm_runtime_get_sync(dev);

5534 5535 5536 5537 5538 5539
	/*
	 * The device-initialize-sequence hasn't been invoked yet.
	 * Set the device to power-off state
	 */
	ufshcd_set_ufs_dev_poweroff(hba);

5540 5541
	async_schedule(ufshcd_async_scan, hba);

5542 5543
	return 0;

5544 5545
out_remove_scsi_host:
	scsi_remove_host(hba->host);
5546 5547
exit_gating:
	ufshcd_exit_clk_gating(hba);
5548
out_disable:
5549
	hba->is_irq_enabled = false;
5550
	scsi_host_put(host);
5551
	ufshcd_hba_exit(hba);
5552 5553 5554 5555 5556 5557 5558
out_error:
	return err;
}
EXPORT_SYMBOL_GPL(ufshcd_init);

MODULE_AUTHOR("Santosh Yaragnavi <santosh.sy@samsung.com>");
MODULE_AUTHOR("Vinayak Holikatti <h.vinayak@samsung.com>");
5559
MODULE_DESCRIPTION("Generic UFS host controller driver Core");
5560 5561
MODULE_LICENSE("GPL");
MODULE_VERSION(UFSHCD_DRIVER_VERSION);