i2c-qup.c 36.0 KB
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/*
 * Copyright (c) 2009-2013, The Linux Foundation. All rights reserved.
 * Copyright (c) 2014, Sony Mobile Communications AB.
 *
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 and
 * only version 2 as published by the Free Software Foundation.
 *
 * 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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#include <linux/atomic.h>
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#include <linux/clk.h>
#include <linux/delay.h>
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#include <linux/dmaengine.h>
#include <linux/dmapool.h>
#include <linux/dma-mapping.h>
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#include <linux/err.h>
#include <linux/i2c.h>
#include <linux/interrupt.h>
#include <linux/io.h>
#include <linux/module.h>
#include <linux/of.h>
#include <linux/platform_device.h>
#include <linux/pm_runtime.h>
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#include <linux/scatterlist.h>
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/* QUP Registers */
#define QUP_CONFIG		0x000
#define QUP_STATE		0x004
#define QUP_IO_MODE		0x008
#define QUP_SW_RESET		0x00c
#define QUP_OPERATIONAL		0x018
#define QUP_ERROR_FLAGS		0x01c
#define QUP_ERROR_FLAGS_EN	0x020
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#define QUP_OPERATIONAL_MASK	0x028
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#define QUP_HW_VERSION		0x030
#define QUP_MX_OUTPUT_CNT	0x100
#define QUP_OUT_FIFO_BASE	0x110
#define QUP_MX_WRITE_CNT	0x150
#define QUP_MX_INPUT_CNT	0x200
#define QUP_MX_READ_CNT		0x208
#define QUP_IN_FIFO_BASE	0x218
#define QUP_I2C_CLK_CTL		0x400
#define QUP_I2C_STATUS		0x404
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#define QUP_I2C_MASTER_GEN	0x408
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/* QUP States and reset values */
#define QUP_RESET_STATE		0
#define QUP_RUN_STATE		1
#define QUP_PAUSE_STATE		3
#define QUP_STATE_MASK		3

#define QUP_STATE_VALID		BIT(2)
#define QUP_I2C_MAST_GEN	BIT(4)
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#define QUP_I2C_FLUSH		BIT(6)
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#define QUP_OPERATIONAL_RESET	0x000ff0
#define QUP_I2C_STATUS_RESET	0xfffffc

/* QUP OPERATIONAL FLAGS */
#define QUP_I2C_NACK_FLAG	BIT(3)
#define QUP_OUT_NOT_EMPTY	BIT(4)
#define QUP_IN_NOT_EMPTY	BIT(5)
#define QUP_OUT_FULL		BIT(6)
#define QUP_OUT_SVC_FLAG	BIT(8)
#define QUP_IN_SVC_FLAG		BIT(9)
#define QUP_MX_OUTPUT_DONE	BIT(10)
#define QUP_MX_INPUT_DONE	BIT(11)

/* I2C mini core related values */
#define QUP_CLOCK_AUTO_GATE	BIT(13)
#define I2C_MINI_CORE		(2 << 8)
#define I2C_N_VAL		15
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#define I2C_N_VAL_V2		7

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/* Most significant word offset in FIFO port */
#define QUP_MSW_SHIFT		(I2C_N_VAL + 1)

/* Packing/Unpacking words in FIFOs, and IO modes */
#define QUP_OUTPUT_BLK_MODE	(1 << 10)
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#define QUP_OUTPUT_BAM_MODE	(3 << 10)
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#define QUP_INPUT_BLK_MODE	(1 << 12)
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#define QUP_INPUT_BAM_MODE	(3 << 12)
#define QUP_BAM_MODE		(QUP_OUTPUT_BAM_MODE | QUP_INPUT_BAM_MODE)
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#define QUP_UNPACK_EN		BIT(14)
#define QUP_PACK_EN		BIT(15)

#define QUP_REPACK_EN		(QUP_UNPACK_EN | QUP_PACK_EN)
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#define QUP_V2_TAGS_EN		1
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#define QUP_OUTPUT_BLOCK_SIZE(x)(((x) >> 0) & 0x03)
#define QUP_OUTPUT_FIFO_SIZE(x)	(((x) >> 2) & 0x07)
#define QUP_INPUT_BLOCK_SIZE(x)	(((x) >> 5) & 0x03)
#define QUP_INPUT_FIFO_SIZE(x)	(((x) >> 7) & 0x07)

/* QUP tags */
#define QUP_TAG_START		(1 << 8)
#define QUP_TAG_DATA		(2 << 8)
#define QUP_TAG_STOP		(3 << 8)
#define QUP_TAG_REC		(4 << 8)
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#define QUP_BAM_INPUT_EOT		0x93
#define QUP_BAM_FLUSH_STOP		0x96
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/* QUP v2 tags */
#define QUP_TAG_V2_START               0x81
#define QUP_TAG_V2_DATAWR              0x82
#define QUP_TAG_V2_DATAWR_STOP         0x83
#define QUP_TAG_V2_DATARD              0x85
#define QUP_TAG_V2_DATARD_STOP         0x87

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/* Status, Error flags */
#define I2C_STATUS_WR_BUFFER_FULL	BIT(0)
#define I2C_STATUS_BUS_ACTIVE		BIT(8)
#define I2C_STATUS_ERROR_MASK		0x38000fc
#define QUP_STATUS_ERROR_FLAGS		0x7c

#define QUP_READ_LIMIT			256
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#define SET_BIT				0x1
#define RESET_BIT			0x0
#define ONE_BYTE			0x1
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#define QUP_I2C_MX_CONFIG_DURING_RUN   BIT(31)
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#define MX_TX_RX_LEN			SZ_64K
#define MX_BLOCKS			(MX_TX_RX_LEN / QUP_READ_LIMIT)

/* Max timeout in ms for 32k bytes */
#define TOUT_MAX			300

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struct qup_i2c_block {
	int	count;
	int	pos;
	int	tx_tag_len;
	int	rx_tag_len;
	int	data_len;
	u8	tags[6];
};

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struct qup_i2c_tag {
	u8 *start;
	dma_addr_t addr;
};

struct qup_i2c_bam {
	struct	qup_i2c_tag tag;
	struct	dma_chan *dma;
	struct	scatterlist *sg;
};

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struct qup_i2c_dev {
	struct device		*dev;
	void __iomem		*base;
	int			irq;
	struct clk		*clk;
	struct clk		*pclk;
	struct i2c_adapter	adap;

	int			clk_ctl;
	int			out_fifo_sz;
	int			in_fifo_sz;
	int			out_blk_sz;
	int			in_blk_sz;

	unsigned long		one_byte_t;
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	struct qup_i2c_block	blk;
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	struct i2c_msg		*msg;
	/* Current posion in user message buffer */
	int			pos;
	/* I2C protocol errors */
	u32			bus_err;
	/* QUP core errors */
	u32			qup_err;

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	/* To check if this is the last msg */
	bool			is_last;

	/* To configure when bus is in run state */
	int			config_run;

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	/* dma parameters */
	bool			is_dma;
	struct			dma_pool *dpool;
	struct			qup_i2c_tag start_tag;
	struct			qup_i2c_bam brx;
	struct			qup_i2c_bam btx;

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	struct completion	xfer;
};

static irqreturn_t qup_i2c_interrupt(int irq, void *dev)
{
	struct qup_i2c_dev *qup = dev;
	u32 bus_err;
	u32 qup_err;
	u32 opflags;

	bus_err = readl(qup->base + QUP_I2C_STATUS);
	qup_err = readl(qup->base + QUP_ERROR_FLAGS);
	opflags = readl(qup->base + QUP_OPERATIONAL);

	if (!qup->msg) {
		/* Clear Error interrupt */
		writel(QUP_RESET_STATE, qup->base + QUP_STATE);
		return IRQ_HANDLED;
	}

	bus_err &= I2C_STATUS_ERROR_MASK;
	qup_err &= QUP_STATUS_ERROR_FLAGS;

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	/* Clear the error bits in QUP_ERROR_FLAGS */
	if (qup_err)
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		writel(qup_err, qup->base + QUP_ERROR_FLAGS);

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	/* Clear the error bits in QUP_I2C_STATUS */
	if (bus_err)
		writel(bus_err, qup->base + QUP_I2C_STATUS);

	/* Reset the QUP State in case of error */
	if (qup_err || bus_err) {
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		writel(QUP_RESET_STATE, qup->base + QUP_STATE);
		goto done;
	}

	if (opflags & QUP_IN_SVC_FLAG)
		writel(QUP_IN_SVC_FLAG, qup->base + QUP_OPERATIONAL);

	if (opflags & QUP_OUT_SVC_FLAG)
		writel(QUP_OUT_SVC_FLAG, qup->base + QUP_OPERATIONAL);

done:
	qup->qup_err = qup_err;
	qup->bus_err = bus_err;
	complete(&qup->xfer);
	return IRQ_HANDLED;
}

static int qup_i2c_poll_state_mask(struct qup_i2c_dev *qup,
				   u32 req_state, u32 req_mask)
{
	int retries = 1;
	u32 state;

	/*
	 * State transition takes 3 AHB clocks cycles + 3 I2C master clock
	 * cycles. So retry once after a 1uS delay.
	 */
	do {
		state = readl(qup->base + QUP_STATE);

		if (state & QUP_STATE_VALID &&
		    (state & req_mask) == req_state)
			return 0;

		udelay(1);
	} while (retries--);

	return -ETIMEDOUT;
}

static int qup_i2c_poll_state(struct qup_i2c_dev *qup, u32 req_state)
{
	return qup_i2c_poll_state_mask(qup, req_state, QUP_STATE_MASK);
}

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static void qup_i2c_flush(struct qup_i2c_dev *qup)
{
	u32 val = readl(qup->base + QUP_STATE);

	val |= QUP_I2C_FLUSH;
	writel(val, qup->base + QUP_STATE);
}

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static int qup_i2c_poll_state_valid(struct qup_i2c_dev *qup)
{
	return qup_i2c_poll_state_mask(qup, 0, 0);
}

static int qup_i2c_poll_state_i2c_master(struct qup_i2c_dev *qup)
{
	return qup_i2c_poll_state_mask(qup, QUP_I2C_MAST_GEN, QUP_I2C_MAST_GEN);
}

static int qup_i2c_change_state(struct qup_i2c_dev *qup, u32 state)
{
	if (qup_i2c_poll_state_valid(qup) != 0)
		return -EIO;

	writel(state, qup->base + QUP_STATE);

	if (qup_i2c_poll_state(qup, state) != 0)
		return -EIO;
	return 0;
}

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/**
 * qup_i2c_wait_ready - wait for a give number of bytes in tx/rx path
 * @qup: The qup_i2c_dev device
 * @op: The bit/event to wait on
 * @val: value of the bit to wait on, 0 or 1
 * @len: The length the bytes to be transferred
 */
static int qup_i2c_wait_ready(struct qup_i2c_dev *qup, int op, bool val,
			      int len)
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{
	unsigned long timeout;
	u32 opflags;
	u32 status;
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	u32 shift = __ffs(op);
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	int ret = 0;
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	len *= qup->one_byte_t;
	/* timeout after a wait of twice the max time */
	timeout = jiffies + len * 4;
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	for (;;) {
		opflags = readl(qup->base + QUP_OPERATIONAL);
		status = readl(qup->base + QUP_I2C_STATUS);

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		if (((opflags & op) >> shift) == val) {
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			if ((op == QUP_OUT_NOT_EMPTY) && qup->is_last) {
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				if (!(status & I2C_STATUS_BUS_ACTIVE)) {
					ret = 0;
					goto done;
				}
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			} else {
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				ret = 0;
				goto done;
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			}
		}
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		if (time_after(jiffies, timeout)) {
			ret = -ETIMEDOUT;
			goto done;
		}
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		usleep_range(len, len * 2);
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	}
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done:
	if (qup->bus_err || qup->qup_err)
		ret =  (qup->bus_err & QUP_I2C_NACK_FLAG) ? -ENXIO : -EIO;

	return ret;
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}

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static void qup_i2c_set_write_mode_v2(struct qup_i2c_dev *qup,
				      struct i2c_msg *msg)
{
	/* Number of entries to shift out, including the tags */
	int total = msg->len + qup->blk.tx_tag_len;

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	total |= qup->config_run;

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	if (total < qup->out_fifo_sz) {
		/* FIFO mode */
		writel(QUP_REPACK_EN, qup->base + QUP_IO_MODE);
		writel(total, qup->base + QUP_MX_WRITE_CNT);
	} else {
		/* BLOCK mode (transfer data on chunks) */
		writel(QUP_OUTPUT_BLK_MODE | QUP_REPACK_EN,
		       qup->base + QUP_IO_MODE);
		writel(total, qup->base + QUP_MX_OUTPUT_CNT);
	}
}

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static void qup_i2c_set_write_mode(struct qup_i2c_dev *qup, struct i2c_msg *msg)
{
	/* Number of entries to shift out, including the start */
	int total = msg->len + 1;

	if (total < qup->out_fifo_sz) {
		/* FIFO mode */
		writel(QUP_REPACK_EN, qup->base + QUP_IO_MODE);
		writel(total, qup->base + QUP_MX_WRITE_CNT);
	} else {
		/* BLOCK mode (transfer data on chunks) */
		writel(QUP_OUTPUT_BLK_MODE | QUP_REPACK_EN,
		       qup->base + QUP_IO_MODE);
		writel(total, qup->base + QUP_MX_OUTPUT_CNT);
	}
}

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static int check_for_fifo_space(struct qup_i2c_dev *qup)
{
	int ret;

	ret = qup_i2c_change_state(qup, QUP_PAUSE_STATE);
	if (ret)
		goto out;

	ret = qup_i2c_wait_ready(qup, QUP_OUT_FULL,
				 RESET_BIT, 4 * ONE_BYTE);
	if (ret) {
		/* Fifo is full. Drain out the fifo */
		ret = qup_i2c_change_state(qup, QUP_RUN_STATE);
		if (ret)
			goto out;

		ret = qup_i2c_wait_ready(qup, QUP_OUT_NOT_EMPTY,
					 RESET_BIT, 256 * ONE_BYTE);
		if (ret) {
			dev_err(qup->dev, "timeout for fifo out full");
			goto out;
		}

		ret = qup_i2c_change_state(qup, QUP_PAUSE_STATE);
		if (ret)
			goto out;
	}

out:
	return ret;
}

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static int qup_i2c_issue_write(struct qup_i2c_dev *qup, struct i2c_msg *msg)
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{
	u32 addr = msg->addr << 1;
	u32 qup_tag;
	int idx;
	u32 val;
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	int ret = 0;
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	if (qup->pos == 0) {
		val = QUP_TAG_START | addr;
		idx = 1;
	} else {
		val = 0;
		idx = 0;
	}

	while (qup->pos < msg->len) {
		/* Check that there's space in the FIFO for our pair */
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		ret = check_for_fifo_space(qup);
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		if (ret)
			return ret;
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		if (qup->pos == msg->len - 1)
			qup_tag = QUP_TAG_STOP;
		else
			qup_tag = QUP_TAG_DATA;

		if (idx & 1)
			val |= (qup_tag | msg->buf[qup->pos]) << QUP_MSW_SHIFT;
		else
			val = qup_tag | msg->buf[qup->pos];

		/* Write out the pair and the last odd value */
		if (idx & 1 || qup->pos == msg->len - 1)
			writel(val, qup->base + QUP_OUT_FIFO_BASE);

		qup->pos++;
		idx++;
	}
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	ret = qup_i2c_change_state(qup, QUP_RUN_STATE);

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	return ret;
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}

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static void qup_i2c_set_blk_data(struct qup_i2c_dev *qup,
				 struct i2c_msg *msg)
{
	memset(&qup->blk, 0, sizeof(qup->blk));

	qup->blk.data_len = msg->len;
	qup->blk.count = (msg->len + QUP_READ_LIMIT - 1) / QUP_READ_LIMIT;

	/* 4 bytes for first block and 2 writes for rest */
	qup->blk.tx_tag_len = 4 + (qup->blk.count - 1) * 2;

	/* There are 2 tag bytes that are read in to fifo for every block */
	if (msg->flags & I2C_M_RD)
		qup->blk.rx_tag_len = qup->blk.count * 2;
}

static int qup_i2c_send_data(struct qup_i2c_dev *qup, int tlen, u8 *tbuf,
			     int dlen, u8 *dbuf)
{
	u32 val = 0, idx = 0, pos = 0, i = 0, t;
	int  len = tlen + dlen;
	u8 *buf = tbuf;
	int ret = 0;

	while (len > 0) {
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		ret = check_for_fifo_space(qup);
		if (ret)
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			return ret;

		t = (len >= 4) ? 4 : len;

		while (idx < t) {
			if (!i && (pos >= tlen)) {
				buf = dbuf;
				pos = 0;
				i = 1;
			}
			val |= buf[pos++] << (idx++ * 8);
		}

		writel(val, qup->base + QUP_OUT_FIFO_BASE);
		idx  = 0;
		val = 0;
		len -= 4;
	}

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	ret = qup_i2c_change_state(qup, QUP_RUN_STATE);

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	return ret;
}

static int qup_i2c_get_data_len(struct qup_i2c_dev *qup)
{
	int data_len;

	if (qup->blk.data_len > QUP_READ_LIMIT)
		data_len = QUP_READ_LIMIT;
	else
		data_len = qup->blk.data_len;

	return data_len;
}

static int qup_i2c_set_tags(u8 *tags, struct qup_i2c_dev *qup,
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			    struct i2c_msg *msg,  int is_dma)
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{
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	u16 addr = i2c_8bit_addr_from_msg(msg);
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	int len = 0;
	int data_len;

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	int last = (qup->blk.pos == (qup->blk.count - 1)) && (qup->is_last);

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	if (qup->blk.pos == 0) {
		tags[len++] = QUP_TAG_V2_START;
		tags[len++] = addr & 0xff;

		if (msg->flags & I2C_M_TEN)
			tags[len++] = addr >> 8;
	}

	/* Send _STOP commands for the last block */
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	if (last) {
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		if (msg->flags & I2C_M_RD)
			tags[len++] = QUP_TAG_V2_DATARD_STOP;
		else
			tags[len++] = QUP_TAG_V2_DATAWR_STOP;
	} else {
		if (msg->flags & I2C_M_RD)
			tags[len++] = QUP_TAG_V2_DATARD;
		else
			tags[len++] = QUP_TAG_V2_DATAWR;
	}

	data_len = qup_i2c_get_data_len(qup);

	/* 0 implies 256 bytes */
	if (data_len == QUP_READ_LIMIT)
		tags[len++] = 0;
	else
		tags[len++] = data_len;

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	if ((msg->flags & I2C_M_RD) && last && is_dma) {
		tags[len++] = QUP_BAM_INPUT_EOT;
		tags[len++] = QUP_BAM_FLUSH_STOP;
	}

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	return len;
}

static int qup_i2c_issue_xfer_v2(struct qup_i2c_dev *qup, struct i2c_msg *msg)
{
	int data_len = 0, tag_len, index;
	int ret;

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	tag_len = qup_i2c_set_tags(qup->blk.tags, qup, msg, 0);
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	index = msg->len - qup->blk.data_len;

	/* only tags are written for read */
	if (!(msg->flags & I2C_M_RD))
		data_len = qup_i2c_get_data_len(qup);

	ret = qup_i2c_send_data(qup, tag_len, qup->blk.tags,
				data_len, &msg->buf[index]);
	qup->blk.data_len -= data_len;

	return ret;
}

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static void qup_i2c_bam_cb(void *data)
{
	struct qup_i2c_dev *qup = data;

	complete(&qup->xfer);
}

static int qup_sg_set_buf(struct scatterlist *sg, void *buf,
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			  unsigned int buflen, struct qup_i2c_dev *qup,
			  int dir)
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{
	int ret;

	sg_set_buf(sg, buf, buflen);
	ret = dma_map_sg(qup->dev, sg, 1, dir);
	if (!ret)
		return -EINVAL;

	return 0;
}

static void qup_i2c_rel_dma(struct qup_i2c_dev *qup)
{
	if (qup->btx.dma)
		dma_release_channel(qup->btx.dma);
	if (qup->brx.dma)
		dma_release_channel(qup->brx.dma);
	qup->btx.dma = NULL;
	qup->brx.dma = NULL;
}

static int qup_i2c_req_dma(struct qup_i2c_dev *qup)
{
	int err;

	if (!qup->btx.dma) {
		qup->btx.dma = dma_request_slave_channel_reason(qup->dev, "tx");
		if (IS_ERR(qup->btx.dma)) {
			err = PTR_ERR(qup->btx.dma);
			qup->btx.dma = NULL;
			dev_err(qup->dev, "\n tx channel not available");
			return err;
		}
	}

	if (!qup->brx.dma) {
		qup->brx.dma = dma_request_slave_channel_reason(qup->dev, "rx");
		if (IS_ERR(qup->brx.dma)) {
			dev_err(qup->dev, "\n rx channel not available");
			err = PTR_ERR(qup->brx.dma);
			qup->brx.dma = NULL;
			qup_i2c_rel_dma(qup);
			return err;
		}
	}
	return 0;
}

static int qup_i2c_bam_do_xfer(struct qup_i2c_dev *qup, struct i2c_msg *msg,
			       int num)
{
	struct dma_async_tx_descriptor *txd, *rxd = NULL;
	int ret = 0, idx = 0, limit = QUP_READ_LIMIT;
	dma_cookie_t cookie_rx, cookie_tx;
	u32 rx_nents = 0, tx_nents = 0, len, blocks, rem;
	u32 i, tlen, tx_len, tx_buf = 0, rx_buf = 0, off = 0;
	u8 *tags;

	while (idx < num) {
		tx_len = 0, len = 0, i = 0;

		qup->is_last = (idx == (num - 1));

		qup_i2c_set_blk_data(qup, msg);

668 669 670
		blocks = qup->blk.count;
		rem = msg->len - (blocks - 1) * limit;

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		if (msg->flags & I2C_M_RD) {
			rx_nents += (blocks * 2) + 1;
			tx_nents += 1;

			while (qup->blk.pos < blocks) {
676
				tlen = (i == (blocks - 1)) ? rem : limit;
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				tags = &qup->start_tag.start[off + len];
				len += qup_i2c_set_tags(tags, qup, msg, 1);
679
				qup->blk.data_len -= tlen;
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				/* scratch buf to read the start and len tags */
				ret = qup_sg_set_buf(&qup->brx.sg[rx_buf++],
						     &qup->brx.tag.start[0],
684
						     2, qup, DMA_FROM_DEVICE);
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				if (ret)
					return ret;

				ret = qup_sg_set_buf(&qup->brx.sg[rx_buf++],
						     &msg->buf[limit * i],
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						     tlen, qup,
						     DMA_FROM_DEVICE);
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				if (ret)
					return ret;

				i++;
				qup->blk.pos = i;
			}
			ret = qup_sg_set_buf(&qup->btx.sg[tx_buf++],
					     &qup->start_tag.start[off],
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					     len, qup, DMA_TO_DEVICE);
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			if (ret)
				return ret;

			off += len;
			/* scratch buf to read the BAM EOT and FLUSH tags */
			ret = qup_sg_set_buf(&qup->brx.sg[rx_buf++],
					     &qup->brx.tag.start[0],
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					     2, qup, DMA_FROM_DEVICE);
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			if (ret)
				return ret;
		} else {
			tx_nents += (blocks * 2);

			while (qup->blk.pos < blocks) {
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				tlen = (i == (blocks - 1)) ? rem : limit;
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				tags = &qup->start_tag.start[off + tx_len];
				len = qup_i2c_set_tags(tags, qup, msg, 1);
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				qup->blk.data_len -= tlen;
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				ret = qup_sg_set_buf(&qup->btx.sg[tx_buf++],
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						     tags, len,
						     qup, DMA_TO_DEVICE);
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				if (ret)
					return ret;

				tx_len += len;
				ret = qup_sg_set_buf(&qup->btx.sg[tx_buf++],
						     &msg->buf[limit * i],
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						     tlen, qup, DMA_TO_DEVICE);
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				if (ret)
					return ret;
				i++;
				qup->blk.pos = i;
			}
			off += tx_len;

			if (idx == (num - 1)) {
				len = 1;
				if (rx_nents) {
					qup->btx.tag.start[0] =
							QUP_BAM_INPUT_EOT;
					len++;
				}
				qup->btx.tag.start[len - 1] =
							QUP_BAM_FLUSH_STOP;
				ret = qup_sg_set_buf(&qup->btx.sg[tx_buf++],
						     &qup->btx.tag.start[0],
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						     len, qup, DMA_TO_DEVICE);
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				if (ret)
					return ret;
				tx_nents += 1;
			}
		}
		idx++;
		msg++;
	}

	txd = dmaengine_prep_slave_sg(qup->btx.dma, qup->btx.sg, tx_nents,
				      DMA_MEM_TO_DEV,
				      DMA_PREP_INTERRUPT | DMA_PREP_FENCE);
	if (!txd) {
		dev_err(qup->dev, "failed to get tx desc\n");
		ret = -EINVAL;
		goto desc_err;
	}

	if (!rx_nents) {
		txd->callback = qup_i2c_bam_cb;
		txd->callback_param = qup;
	}

	cookie_tx = dmaengine_submit(txd);
	if (dma_submit_error(cookie_tx)) {
		ret = -EINVAL;
		goto desc_err;
	}

	dma_async_issue_pending(qup->btx.dma);

	if (rx_nents) {
		rxd = dmaengine_prep_slave_sg(qup->brx.dma, qup->brx.sg,
					      rx_nents, DMA_DEV_TO_MEM,
					      DMA_PREP_INTERRUPT);
		if (!rxd) {
			dev_err(qup->dev, "failed to get rx desc\n");
			ret = -EINVAL;

			/* abort TX descriptors */
			dmaengine_terminate_all(qup->btx.dma);
			goto desc_err;
		}

		rxd->callback = qup_i2c_bam_cb;
		rxd->callback_param = qup;
		cookie_rx = dmaengine_submit(rxd);
		if (dma_submit_error(cookie_rx)) {
			ret = -EINVAL;
			goto desc_err;
		}

		dma_async_issue_pending(qup->brx.dma);
	}

	if (!wait_for_completion_timeout(&qup->xfer, TOUT_MAX * HZ)) {
		dev_err(qup->dev, "normal trans timed out\n");
		ret = -ETIMEDOUT;
	}

	if (ret || qup->bus_err || qup->qup_err) {
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		if (qup_i2c_change_state(qup, QUP_RUN_STATE)) {
			dev_err(qup->dev, "change to run state timed out");
			goto desc_err;
		}
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		if (rx_nents)
			writel(QUP_BAM_INPUT_EOT,
			       qup->base + QUP_OUT_FIFO_BASE);
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		writel(QUP_BAM_FLUSH_STOP, qup->base + QUP_OUT_FIFO_BASE);
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		qup_i2c_flush(qup);
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		/* wait for remaining interrupts to occur */
		if (!wait_for_completion_timeout(&qup->xfer, HZ))
			dev_err(qup->dev, "flush timed out\n");
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		qup_i2c_rel_dma(qup);
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		ret =  (qup->bus_err & QUP_I2C_NACK_FLAG) ? -ENXIO : -EIO;
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	}

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desc_err:
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	dma_unmap_sg(qup->dev, qup->btx.sg, tx_nents, DMA_TO_DEVICE);

	if (rx_nents)
		dma_unmap_sg(qup->dev, qup->brx.sg, rx_nents,
			     DMA_FROM_DEVICE);
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	return ret;
}

static int qup_i2c_bam_xfer(struct i2c_adapter *adap, struct i2c_msg *msg,
			    int num)
{
	struct qup_i2c_dev *qup = i2c_get_adapdata(adap);
	int ret = 0;

	enable_irq(qup->irq);
	ret = qup_i2c_req_dma(qup);

	if (ret)
		goto out;

	writel(0, qup->base + QUP_MX_INPUT_CNT);
	writel(0, qup->base + QUP_MX_OUTPUT_CNT);

	/* set BAM mode */
	writel(QUP_REPACK_EN | QUP_BAM_MODE, qup->base + QUP_IO_MODE);

	/* mask fifo irqs */
	writel((0x3 << 8), qup->base + QUP_OPERATIONAL_MASK);

	/* set RUN STATE */
	ret = qup_i2c_change_state(qup, QUP_RUN_STATE);
	if (ret)
		goto out;

	writel(qup->clk_ctl, qup->base + QUP_I2C_CLK_CTL);

	qup->msg = msg;
	ret = qup_i2c_bam_do_xfer(qup, qup->msg, num);
out:
	disable_irq(qup->irq);

	qup->msg = NULL;
	return ret;
}

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static int qup_i2c_wait_for_complete(struct qup_i2c_dev *qup,
				     struct i2c_msg *msg)
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{
	unsigned long left;
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	int ret = 0;

	left = wait_for_completion_timeout(&qup->xfer, HZ);
	if (!left) {
		writel(1, qup->base + QUP_SW_RESET);
		ret = -ETIMEDOUT;
	}

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	if (qup->bus_err || qup->qup_err)
		ret =  (qup->bus_err & QUP_I2C_NACK_FLAG) ? -ENXIO : -EIO;
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	return ret;
}

static int qup_i2c_write_one_v2(struct qup_i2c_dev *qup, struct i2c_msg *msg)
{
	int ret = 0;

	qup->msg = msg;
	qup->pos = 0;
	enable_irq(qup->irq);
	qup_i2c_set_blk_data(qup, msg);
	qup_i2c_set_write_mode_v2(qup, msg);

	ret = qup_i2c_change_state(qup, QUP_RUN_STATE);
	if (ret)
		goto err;

	writel(qup->clk_ctl, qup->base + QUP_I2C_CLK_CTL);

	do {
		ret = qup_i2c_issue_xfer_v2(qup, msg);
		if (ret)
			goto err;

		ret = qup_i2c_wait_for_complete(qup, msg);
		if (ret)
			goto err;

		qup->blk.pos++;
	} while (qup->blk.pos < qup->blk.count);

	ret = qup_i2c_wait_ready(qup, QUP_OUT_NOT_EMPTY, RESET_BIT, ONE_BYTE);

err:
	disable_irq(qup->irq);
	qup->msg = NULL;

	return ret;
}

static int qup_i2c_write_one(struct qup_i2c_dev *qup, struct i2c_msg *msg)
{
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	int ret;

	qup->msg = msg;
	qup->pos = 0;

	enable_irq(qup->irq);

	qup_i2c_set_write_mode(qup, msg);

	ret = qup_i2c_change_state(qup, QUP_RUN_STATE);
	if (ret)
		goto err;

	writel(qup->clk_ctl, qup->base + QUP_I2C_CLK_CTL);

	do {
		ret = qup_i2c_change_state(qup, QUP_PAUSE_STATE);
		if (ret)
			goto err;

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		ret = qup_i2c_issue_write(qup, msg);
		if (ret)
			goto err;
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		ret = qup_i2c_change_state(qup, QUP_RUN_STATE);
		if (ret)
			goto err;

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		ret = qup_i2c_wait_for_complete(qup, msg);
		if (ret)
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			goto err;
	} while (qup->pos < msg->len);

	/* Wait for the outstanding data in the fifo to drain */
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	ret = qup_i2c_wait_ready(qup, QUP_OUT_NOT_EMPTY, RESET_BIT, ONE_BYTE);
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err:
	disable_irq(qup->irq);
	qup->msg = NULL;

	return ret;
}

static void qup_i2c_set_read_mode(struct qup_i2c_dev *qup, int len)
{
	if (len < qup->in_fifo_sz) {
		/* FIFO mode */
		writel(QUP_REPACK_EN, qup->base + QUP_IO_MODE);
		writel(len, qup->base + QUP_MX_READ_CNT);
	} else {
		/* BLOCK mode (transfer data on chunks) */
		writel(QUP_INPUT_BLK_MODE | QUP_REPACK_EN,
		       qup->base + QUP_IO_MODE);
		writel(len, qup->base + QUP_MX_INPUT_CNT);
	}
}

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static void qup_i2c_set_read_mode_v2(struct qup_i2c_dev *qup, int len)
{
	int tx_len = qup->blk.tx_tag_len;

	len += qup->blk.rx_tag_len;
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	len |= qup->config_run;
	tx_len |= qup->config_run;
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	if (len < qup->in_fifo_sz) {
		/* FIFO mode */
		writel(QUP_REPACK_EN, qup->base + QUP_IO_MODE);
		writel(tx_len, qup->base + QUP_MX_WRITE_CNT);
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		writel(len, qup->base + QUP_MX_READ_CNT);
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	} else {
		/* BLOCK mode (transfer data on chunks) */
		writel(QUP_INPUT_BLK_MODE | QUP_REPACK_EN,
		       qup->base + QUP_IO_MODE);
		writel(tx_len, qup->base + QUP_MX_OUTPUT_CNT);
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		writel(len, qup->base + QUP_MX_INPUT_CNT);
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	}
}

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static void qup_i2c_issue_read(struct qup_i2c_dev *qup, struct i2c_msg *msg)
{
	u32 addr, len, val;

1019
	addr = i2c_8bit_addr_from_msg(msg);
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	/* 0 is used to specify a length 256 (QUP_READ_LIMIT) */
	len = (msg->len == QUP_READ_LIMIT) ? 0 : msg->len;

	val = ((QUP_TAG_REC | len) << QUP_MSW_SHIFT) | QUP_TAG_START | addr;
	writel(val, qup->base + QUP_OUT_FIFO_BASE);
}


1029
static int qup_i2c_read_fifo(struct qup_i2c_dev *qup, struct i2c_msg *msg)
1030 1031 1032
{
	u32 val = 0;
	int idx;
1033
	int ret = 0;
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	for (idx = 0; qup->pos < msg->len; idx++) {
		if ((idx & 1) == 0) {
			/* Check that FIFO have data */
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			ret = qup_i2c_wait_ready(qup, QUP_IN_NOT_EMPTY,
						 SET_BIT, 4 * ONE_BYTE);
			if (ret)
				return ret;
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			/* Reading 2 words at time */
			val = readl(qup->base + QUP_IN_FIFO_BASE);

			msg->buf[qup->pos++] = val & 0xFF;
		} else {
			msg->buf[qup->pos++] = val >> QUP_MSW_SHIFT;
		}
	}
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	return ret;
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}

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static int qup_i2c_read_fifo_v2(struct qup_i2c_dev *qup,
				struct i2c_msg *msg)
{
	u32 val;
	int idx, pos = 0, ret = 0, total;

	total = qup_i2c_get_data_len(qup);

	/* 2 extra bytes for read tags */
	while (pos < (total + 2)) {
		/* Check that FIFO have data */
		ret = qup_i2c_wait_ready(qup, QUP_IN_NOT_EMPTY,
					 SET_BIT, 4 * ONE_BYTE);
		if (ret) {
			dev_err(qup->dev, "timeout for fifo not empty");
			return ret;
		}
		val = readl(qup->base + QUP_IN_FIFO_BASE);

		for (idx = 0; idx < 4; idx++, val >>= 8, pos++) {
			/* first 2 bytes are tag bytes */
			if (pos < 2)
				continue;

			if (pos >= (total + 2))
				goto out;

			msg->buf[qup->pos++] = val & 0xff;
		}
	}

out:
	qup->blk.data_len -= total;

	return ret;
}

static int qup_i2c_read_one_v2(struct qup_i2c_dev *qup, struct i2c_msg *msg)
{
	int ret = 0;

	qup->msg = msg;
	qup->pos  = 0;
	enable_irq(qup->irq);
	qup_i2c_set_blk_data(qup, msg);
	qup_i2c_set_read_mode_v2(qup, msg->len);

	ret = qup_i2c_change_state(qup, QUP_RUN_STATE);
	if (ret)
		goto err;

	writel(qup->clk_ctl, qup->base + QUP_I2C_CLK_CTL);

	do {
		ret = qup_i2c_issue_xfer_v2(qup, msg);
		if (ret)
			goto err;

		ret = qup_i2c_wait_for_complete(qup, msg);
		if (ret)
			goto err;

		ret = qup_i2c_read_fifo_v2(qup, msg);
		if (ret)
			goto err;

		qup->blk.pos++;
	} while (qup->blk.pos < qup->blk.count);

err:
	disable_irq(qup->irq);
	qup->msg = NULL;

	return ret;
}

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static int qup_i2c_read_one(struct qup_i2c_dev *qup, struct i2c_msg *msg)
{
	int ret;

	qup->msg = msg;
	qup->pos  = 0;

	enable_irq(qup->irq);
	qup_i2c_set_read_mode(qup, msg->len);

	ret = qup_i2c_change_state(qup, QUP_RUN_STATE);
	if (ret)
		goto err;

	writel(qup->clk_ctl, qup->base + QUP_I2C_CLK_CTL);

	ret = qup_i2c_change_state(qup, QUP_PAUSE_STATE);
	if (ret)
		goto err;

	qup_i2c_issue_read(qup, msg);

	ret = qup_i2c_change_state(qup, QUP_RUN_STATE);
	if (ret)
		goto err;

	do {
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		ret = qup_i2c_wait_for_complete(qup, msg);
		if (ret)
1160 1161
			goto err;

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		ret = qup_i2c_read_fifo(qup, msg);
		if (ret)
			goto err;
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	} while (qup->pos < msg->len);

err:
	disable_irq(qup->irq);
	qup->msg = NULL;

	return ret;
}

static int qup_i2c_xfer(struct i2c_adapter *adap,
			struct i2c_msg msgs[],
			int num)
{
	struct qup_i2c_dev *qup = i2c_get_adapdata(adap);
	int ret, idx;

	ret = pm_runtime_get_sync(qup->dev);
1182
	if (ret < 0)
1183 1184
		goto out;

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	qup->bus_err = 0;
	qup->qup_err = 0;

1188 1189 1190 1191 1192 1193 1194 1195 1196 1197 1198 1199 1200 1201 1202 1203 1204 1205 1206 1207 1208 1209 1210 1211 1212 1213 1214 1215 1216 1217 1218 1219 1220 1221 1222 1223 1224 1225 1226 1227 1228 1229
	writel(1, qup->base + QUP_SW_RESET);
	ret = qup_i2c_poll_state(qup, QUP_RESET_STATE);
	if (ret)
		goto out;

	/* Configure QUP as I2C mini core */
	writel(I2C_MINI_CORE | I2C_N_VAL, qup->base + QUP_CONFIG);

	for (idx = 0; idx < num; idx++) {
		if (msgs[idx].len == 0) {
			ret = -EINVAL;
			goto out;
		}

		if (qup_i2c_poll_state_i2c_master(qup)) {
			ret = -EIO;
			goto out;
		}

		if (msgs[idx].flags & I2C_M_RD)
			ret = qup_i2c_read_one(qup, &msgs[idx]);
		else
			ret = qup_i2c_write_one(qup, &msgs[idx]);

		if (ret)
			break;

		ret = qup_i2c_change_state(qup, QUP_RESET_STATE);
		if (ret)
			break;
	}

	if (ret == 0)
		ret = num;
out:

	pm_runtime_mark_last_busy(qup->dev);
	pm_runtime_put_autosuspend(qup->dev);

	return ret;
}

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static int qup_i2c_xfer_v2(struct i2c_adapter *adap,
			   struct i2c_msg msgs[],
			   int num)
{
	struct qup_i2c_dev *qup = i2c_get_adapdata(adap);
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	int ret, len, idx = 0, use_dma = 0;
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	qup->bus_err = 0;
	qup->qup_err = 0;

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	ret = pm_runtime_get_sync(qup->dev);
	if (ret < 0)
		goto out;

	writel(1, qup->base + QUP_SW_RESET);
	ret = qup_i2c_poll_state(qup, QUP_RESET_STATE);
	if (ret)
		goto out;

	/* Configure QUP as I2C mini core */
	writel(I2C_MINI_CORE | I2C_N_VAL_V2, qup->base + QUP_CONFIG);
	writel(QUP_V2_TAGS_EN, qup->base + QUP_I2C_MASTER_GEN);

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	if ((qup->is_dma)) {
		/* All i2c_msgs should be transferred using either dma or cpu */
		for (idx = 0; idx < num; idx++) {
			if (msgs[idx].len == 0) {
				ret = -EINVAL;
				goto out;
			}

			len = (msgs[idx].len > qup->out_fifo_sz) ||
			      (msgs[idx].len > qup->in_fifo_sz);

			if ((!is_vmalloc_addr(msgs[idx].buf)) && len) {
				use_dma = 1;
			 } else {
				use_dma = 0;
				break;
			}
		}
	}

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	idx = 0;

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	do {
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		if (msgs[idx].len == 0) {
			ret = -EINVAL;
			goto out;
		}

		if (qup_i2c_poll_state_i2c_master(qup)) {
			ret = -EIO;
			goto out;
		}

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		qup->is_last = (idx == (num - 1));
		if (idx)
			qup->config_run = QUP_I2C_MX_CONFIG_DURING_RUN;
		else
			qup->config_run = 0;

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		reinit_completion(&qup->xfer);

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		if (use_dma) {
			ret = qup_i2c_bam_xfer(adap, &msgs[idx], num);
		} else {
			if (msgs[idx].flags & I2C_M_RD)
				ret = qup_i2c_read_one_v2(qup, &msgs[idx]);
			else
				ret = qup_i2c_write_one_v2(qup, &msgs[idx]);
		}
	} while ((idx++ < (num - 1)) && !use_dma && !ret);
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	if (!ret)
		ret = qup_i2c_change_state(qup, QUP_RESET_STATE);

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	if (ret == 0)
		ret = num;
out:
	pm_runtime_mark_last_busy(qup->dev);
	pm_runtime_put_autosuspend(qup->dev);

	return ret;
}

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static u32 qup_i2c_func(struct i2c_adapter *adap)
{
	return I2C_FUNC_I2C | (I2C_FUNC_SMBUS_EMUL & ~I2C_FUNC_SMBUS_QUICK);
}

static const struct i2c_algorithm qup_i2c_algo = {
	.master_xfer	= qup_i2c_xfer,
	.functionality	= qup_i2c_func,
};

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static const struct i2c_algorithm qup_i2c_algo_v2 = {
	.master_xfer	= qup_i2c_xfer_v2,
	.functionality	= qup_i2c_func,
};

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/*
 * The QUP block will issue a NACK and STOP on the bus when reaching
 * the end of the read, the length of the read is specified as one byte
 * which limits the possible read to 256 (QUP_READ_LIMIT) bytes.
 */
static struct i2c_adapter_quirks qup_i2c_quirks = {
	.max_read_len = QUP_READ_LIMIT,
};

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static void qup_i2c_enable_clocks(struct qup_i2c_dev *qup)
{
	clk_prepare_enable(qup->clk);
	clk_prepare_enable(qup->pclk);
}

static void qup_i2c_disable_clocks(struct qup_i2c_dev *qup)
{
	u32 config;

	qup_i2c_change_state(qup, QUP_RESET_STATE);
	clk_disable_unprepare(qup->clk);
	config = readl(qup->base + QUP_CONFIG);
	config |= QUP_CLOCK_AUTO_GATE;
	writel(config, qup->base + QUP_CONFIG);
	clk_disable_unprepare(qup->pclk);
}

static int qup_i2c_probe(struct platform_device *pdev)
{
	static const int blk_sizes[] = {4, 16, 32};
	struct device_node *node = pdev->dev.of_node;
	struct qup_i2c_dev *qup;
	unsigned long one_bit_t;
	struct resource *res;
	u32 io_mode, hw_ver, size;
	int ret, fs_div, hs_div;
	int src_clk_freq;
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	u32 clk_freq = 100000;
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	int blocks;
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	qup = devm_kzalloc(&pdev->dev, sizeof(*qup), GFP_KERNEL);
	if (!qup)
		return -ENOMEM;

	qup->dev = &pdev->dev;
	init_completion(&qup->xfer);
	platform_set_drvdata(pdev, qup);

	of_property_read_u32(node, "clock-frequency", &clk_freq);

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	if (of_device_is_compatible(pdev->dev.of_node, "qcom,i2c-qup-v1.1.1")) {
		qup->adap.algo = &qup_i2c_algo;
		qup->adap.quirks = &qup_i2c_quirks;
	} else {
		qup->adap.algo = &qup_i2c_algo_v2;
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		ret = qup_i2c_req_dma(qup);

		if (ret == -EPROBE_DEFER)
			goto fail_dma;
		else if (ret != 0)
			goto nodma;

		blocks = (MX_BLOCKS << 1) + 1;
		qup->btx.sg = devm_kzalloc(&pdev->dev,
					   sizeof(*qup->btx.sg) * blocks,
					   GFP_KERNEL);
		if (!qup->btx.sg) {
			ret = -ENOMEM;
			goto fail_dma;
		}
		sg_init_table(qup->btx.sg, blocks);

		qup->brx.sg = devm_kzalloc(&pdev->dev,
					   sizeof(*qup->brx.sg) * blocks,
					   GFP_KERNEL);
		if (!qup->brx.sg) {
			ret = -ENOMEM;
			goto fail_dma;
		}
		sg_init_table(qup->brx.sg, blocks);

		/* 2 tag bytes for each block + 5 for start, stop tags */
		size = blocks * 2 + 5;

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		qup->start_tag.start = devm_kzalloc(&pdev->dev,
						    size, GFP_KERNEL);
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		if (!qup->start_tag.start) {
			ret = -ENOMEM;
			goto fail_dma;
		}

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		qup->brx.tag.start = devm_kzalloc(&pdev->dev, 2, GFP_KERNEL);
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		if (!qup->brx.tag.start) {
			ret = -ENOMEM;
			goto fail_dma;
		}

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		qup->btx.tag.start = devm_kzalloc(&pdev->dev, 2, GFP_KERNEL);
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		if (!qup->btx.tag.start) {
			ret = -ENOMEM;
			goto fail_dma;
		}
		qup->is_dma = true;
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	}

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nodma:
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	/* We support frequencies up to FAST Mode (400KHz) */
	if (!clk_freq || clk_freq > 400000) {
		dev_err(qup->dev, "clock frequency not supported %d\n",
			clk_freq);
		return -EINVAL;
	}

	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	qup->base = devm_ioremap_resource(qup->dev, res);
	if (IS_ERR(qup->base))
		return PTR_ERR(qup->base);

	qup->irq = platform_get_irq(pdev, 0);
	if (qup->irq < 0) {
		dev_err(qup->dev, "No IRQ defined\n");
		return qup->irq;
	}

	qup->clk = devm_clk_get(qup->dev, "core");
	if (IS_ERR(qup->clk)) {
		dev_err(qup->dev, "Could not get core clock\n");
		return PTR_ERR(qup->clk);
	}

	qup->pclk = devm_clk_get(qup->dev, "iface");
	if (IS_ERR(qup->pclk)) {
		dev_err(qup->dev, "Could not get iface clock\n");
		return PTR_ERR(qup->pclk);
	}

	qup_i2c_enable_clocks(qup);

	/*
	 * Bootloaders might leave a pending interrupt on certain QUP's,
	 * so we reset the core before registering for interrupts.
	 */
	writel(1, qup->base + QUP_SW_RESET);
	ret = qup_i2c_poll_state_valid(qup);
	if (ret)
		goto fail;

	ret = devm_request_irq(qup->dev, qup->irq, qup_i2c_interrupt,
			       IRQF_TRIGGER_HIGH, "i2c_qup", qup);
	if (ret) {
		dev_err(qup->dev, "Request %d IRQ failed\n", qup->irq);
		goto fail;
	}
	disable_irq(qup->irq);

	hw_ver = readl(qup->base + QUP_HW_VERSION);
	dev_dbg(qup->dev, "Revision %x\n", hw_ver);

	io_mode = readl(qup->base + QUP_IO_MODE);

	/*
	 * The block/fifo size w.r.t. 'actual data' is 1/2 due to 'tag'
	 * associated with each byte written/received
	 */
	size = QUP_OUTPUT_BLOCK_SIZE(io_mode);
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	if (size >= ARRAY_SIZE(blk_sizes)) {
		ret = -EIO;
		goto fail;
	}
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	qup->out_blk_sz = blk_sizes[size] / 2;

	size = QUP_INPUT_BLOCK_SIZE(io_mode);
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	if (size >= ARRAY_SIZE(blk_sizes)) {
		ret = -EIO;
		goto fail;
	}
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	qup->in_blk_sz = blk_sizes[size] / 2;

	size = QUP_OUTPUT_FIFO_SIZE(io_mode);
	qup->out_fifo_sz = qup->out_blk_sz * (2 << size);

	size = QUP_INPUT_FIFO_SIZE(io_mode);
	qup->in_fifo_sz = qup->in_blk_sz * (2 << size);

	src_clk_freq = clk_get_rate(qup->clk);
	fs_div = ((src_clk_freq / clk_freq) / 2) - 3;
	hs_div = 3;
	qup->clk_ctl = (hs_div << 8) | (fs_div & 0xff);

	/*
	 * Time it takes for a byte to be clocked out on the bus.
	 * Each byte takes 9 clock cycles (8 bits + 1 ack).
	 */
	one_bit_t = (USEC_PER_SEC / clk_freq) + 1;
	qup->one_byte_t = one_bit_t * 9;

	dev_dbg(qup->dev, "IN:block:%d, fifo:%d, OUT:block:%d, fifo:%d\n",
		qup->in_blk_sz, qup->in_fifo_sz,
		qup->out_blk_sz, qup->out_fifo_sz);

	i2c_set_adapdata(&qup->adap, qup);
	qup->adap.dev.parent = qup->dev;
	qup->adap.dev.of_node = pdev->dev.of_node;
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	qup->is_last = true;
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	strlcpy(qup->adap.name, "QUP I2C adapter", sizeof(qup->adap.name));

	pm_runtime_set_autosuspend_delay(qup->dev, MSEC_PER_SEC);
	pm_runtime_use_autosuspend(qup->dev);
	pm_runtime_set_active(qup->dev);
	pm_runtime_enable(qup->dev);
1542 1543 1544 1545 1546

	ret = i2c_add_adapter(&qup->adap);
	if (ret)
		goto fail_runtime;

1547 1548
	return 0;

1549 1550 1551
fail_runtime:
	pm_runtime_disable(qup->dev);
	pm_runtime_set_suspended(qup->dev);
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fail:
	qup_i2c_disable_clocks(qup);
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fail_dma:
	if (qup->btx.dma)
		dma_release_channel(qup->btx.dma);
	if (qup->brx.dma)
		dma_release_channel(qup->brx.dma);
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	return ret;
}

static int qup_i2c_remove(struct platform_device *pdev)
{
	struct qup_i2c_dev *qup = platform_get_drvdata(pdev);

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	if (qup->is_dma) {
		dma_release_channel(qup->btx.dma);
		dma_release_channel(qup->brx.dma);
	}

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	disable_irq(qup->irq);
	qup_i2c_disable_clocks(qup);
	i2c_del_adapter(&qup->adap);
	pm_runtime_disable(qup->dev);
	pm_runtime_set_suspended(qup->dev);
	return 0;
}

#ifdef CONFIG_PM
static int qup_i2c_pm_suspend_runtime(struct device *device)
{
	struct qup_i2c_dev *qup = dev_get_drvdata(device);

	dev_dbg(device, "pm_runtime: suspending...\n");
	qup_i2c_disable_clocks(qup);
	return 0;
}

static int qup_i2c_pm_resume_runtime(struct device *device)
{
	struct qup_i2c_dev *qup = dev_get_drvdata(device);

	dev_dbg(device, "pm_runtime: resuming...\n");
	qup_i2c_enable_clocks(qup);
	return 0;
}
#endif

#ifdef CONFIG_PM_SLEEP
static int qup_i2c_suspend(struct device *device)
{
	qup_i2c_pm_suspend_runtime(device);
	return 0;
}

static int qup_i2c_resume(struct device *device)
{
	qup_i2c_pm_resume_runtime(device);
	pm_runtime_mark_last_busy(device);
	pm_request_autosuspend(device);
	return 0;
}
#endif

static const struct dev_pm_ops qup_i2c_qup_pm_ops = {
	SET_SYSTEM_SLEEP_PM_OPS(
		qup_i2c_suspend,
		qup_i2c_resume)
	SET_RUNTIME_PM_OPS(
		qup_i2c_pm_suspend_runtime,
		qup_i2c_pm_resume_runtime,
		NULL)
};

static const struct of_device_id qup_i2c_dt_match[] = {
	{ .compatible = "qcom,i2c-qup-v1.1.1" },
	{ .compatible = "qcom,i2c-qup-v2.1.1" },
	{ .compatible = "qcom,i2c-qup-v2.2.1" },
	{}
};
MODULE_DEVICE_TABLE(of, qup_i2c_dt_match);

static struct platform_driver qup_i2c_driver = {
	.probe  = qup_i2c_probe,
	.remove = qup_i2c_remove,
	.driver = {
		.name = "i2c_qup",
		.pm = &qup_i2c_qup_pm_ops,
		.of_match_table = qup_i2c_dt_match,
	},
};

module_platform_driver(qup_i2c_driver);

MODULE_LICENSE("GPL v2");
MODULE_ALIAS("platform:i2c_qup");