isp1760-hcd.c 56.2 KB
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/*
 * Driver for the NXP ISP1760 chip
 *
 * However, the code might contain some bugs. What doesn't work for sure is:
 * - ISO
 * - OTG
 e The interrupt line is configured as active low, level.
 *
 * (c) 2007 Sebastian Siewior <bigeasy@linutronix.de>
 *
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 * (c) 2011 Arvid Brodin <arvid.brodin@enea.com>
 *
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 */
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#include <linux/gpio/consumer.h>
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#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/slab.h>
#include <linux/list.h>
#include <linux/usb.h>
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#include <linux/usb/hcd.h>
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#include <linux/debugfs.h>
#include <linux/uaccess.h>
#include <linux/io.h>
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#include <linux/mm.h>
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#include <linux/timer.h>
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#include <asm/unaligned.h>
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#include <asm/cacheflush.h>
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#include "isp1760-core.h"
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#include "isp1760-hcd.h"
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#include "isp1760-regs.h"
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static struct kmem_cache *qtd_cachep;
static struct kmem_cache *qh_cachep;
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static struct kmem_cache *urb_listitem_cachep;
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typedef void (packet_enqueue)(struct usb_hcd *hcd, struct isp1760_qh *qh,
		struct isp1760_qtd *qtd);
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static inline struct isp1760_hcd *hcd_to_priv(struct usb_hcd *hcd)
{
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	return *(struct isp1760_hcd **)hcd->hcd_priv;
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}

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/* urb state*/
#define DELETE_URB		(0x0008)
#define NO_TRANSFER_ACTIVE	(0xffffffff)

/* Philips Proprietary Transfer Descriptor (PTD) */
typedef __u32 __bitwise __dw;
struct ptd {
	__dw dw0;
	__dw dw1;
	__dw dw2;
	__dw dw3;
	__dw dw4;
	__dw dw5;
	__dw dw6;
	__dw dw7;
};
#define PTD_OFFSET		0x0400
#define ISO_PTD_OFFSET		0x0400
#define INT_PTD_OFFSET		0x0800
#define ATL_PTD_OFFSET		0x0c00
#define PAYLOAD_OFFSET		0x1000


/* ATL */
/* DW0 */
#define DW0_VALID_BIT			1
#define FROM_DW0_VALID(x)		((x) & 0x01)
#define TO_DW0_LENGTH(x)		(((u32) x) << 3)
#define TO_DW0_MAXPACKET(x)		(((u32) x) << 18)
#define TO_DW0_MULTI(x)			(((u32) x) << 29)
#define TO_DW0_ENDPOINT(x)		(((u32)	x) << 31)
/* DW1 */
#define TO_DW1_DEVICE_ADDR(x)		(((u32) x) << 3)
#define TO_DW1_PID_TOKEN(x)		(((u32) x) << 10)
#define DW1_TRANS_BULK			((u32) 2 << 12)
#define DW1_TRANS_INT			((u32) 3 << 12)
#define DW1_TRANS_SPLIT			((u32) 1 << 14)
#define DW1_SE_USB_LOSPEED		((u32) 2 << 16)
#define TO_DW1_PORT_NUM(x)		(((u32) x) << 18)
#define TO_DW1_HUB_NUM(x)		(((u32) x) << 25)
/* DW2 */
#define TO_DW2_DATA_START_ADDR(x)	(((u32) x) << 8)
#define TO_DW2_RL(x)			((x) << 25)
#define FROM_DW2_RL(x)			(((x) >> 25) & 0xf)
/* DW3 */
#define FROM_DW3_NRBYTESTRANSFERRED(x)		((x) & 0x7fff)
#define FROM_DW3_SCS_NRBYTESTRANSFERRED(x)	((x) & 0x07ff)
#define TO_DW3_NAKCOUNT(x)		((x) << 19)
#define FROM_DW3_NAKCOUNT(x)		(((x) >> 19) & 0xf)
#define TO_DW3_CERR(x)			((x) << 23)
#define FROM_DW3_CERR(x)		(((x) >> 23) & 0x3)
#define TO_DW3_DATA_TOGGLE(x)		((x) << 25)
#define FROM_DW3_DATA_TOGGLE(x)		(((x) >> 25) & 0x1)
#define TO_DW3_PING(x)			((x) << 26)
#define FROM_DW3_PING(x)		(((x) >> 26) & 0x1)
#define DW3_ERROR_BIT			(1 << 28)
#define DW3_BABBLE_BIT			(1 << 29)
#define DW3_HALT_BIT			(1 << 30)
#define DW3_ACTIVE_BIT			(1 << 31)
#define FROM_DW3_ACTIVE(x)		(((x) >> 31) & 0x01)

#define INT_UNDERRUN			(1 << 2)
#define INT_BABBLE			(1 << 1)
#define INT_EXACT			(1 << 0)

#define SETUP_PID	(2)
#define IN_PID		(1)
#define OUT_PID		(0)

/* Errata 1 */
#define RL_COUNTER	(0)
#define NAK_COUNTER	(0)
#define ERR_COUNTER	(2)
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struct isp1760_qtd {
	u8 packet_type;
	void *data_buffer;
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	u32 payload_addr;

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	/* the rest is HCD-private */
	struct list_head qtd_list;
	struct urb *urb;
	size_t length;
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	size_t actual_length;

	/* QTD_ENQUEUED:	waiting for transfer (inactive) */
	/* QTD_PAYLOAD_ALLOC:	chip mem has been allocated for payload */
	/* QTD_XFER_STARTED:	valid ptd has been written to isp176x - only
				interrupt handler may touch this qtd! */
	/* QTD_XFER_COMPLETE:	payload has been transferred successfully */
	/* QTD_RETIRE:		transfer error/abort qtd */
#define QTD_ENQUEUED		0
#define QTD_PAYLOAD_ALLOC	1
#define QTD_XFER_STARTED	2
#define QTD_XFER_COMPLETE	3
#define QTD_RETIRE		4
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	u32 status;
};

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/* Queue head, one for each active endpoint */
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struct isp1760_qh {
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	struct list_head qh_list;
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	struct list_head qtd_list;
	u32 toggle;
	u32 ping;
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	int slot;
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	int tt_buffer_dirty;	/* See USB2.0 spec section 11.17.5 */
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};

struct urb_listitem {
	struct list_head urb_list;
	struct urb *urb;
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};

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/*
 * Access functions for isp176x registers (addresses 0..0x03FF).
 */
static u32 reg_read32(void __iomem *base, u32 reg)
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{
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	return isp1760_read32(base, reg);
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}

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static void reg_write32(void __iomem *base, u32 reg, u32 val)
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{
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	isp1760_write32(base, reg, val);
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}

/*
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 * Access functions for isp176x memory (offset >= 0x0400).
 *
 * bank_reads8() reads memory locations prefetched by an earlier write to
 * HC_MEMORY_REG (see isp176x datasheet). Unless you want to do fancy multi-
 * bank optimizations, you should use the more generic mem_reads8() below.
 *
 * For access to ptd memory, use the specialized ptd_read() and ptd_write()
 * below.
 *
 * These functions copy via MMIO data to/from the device. memcpy_{to|from}io()
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 * doesn't quite work because some people have to enforce 32-bit access
 */
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static void bank_reads8(void __iomem *src_base, u32 src_offset, u32 bank_addr,
							__u32 *dst, u32 bytes)
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{
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	__u32 __iomem *src;
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	u32 val;
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	__u8 *src_byteptr;
	__u8 *dst_byteptr;
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	src = src_base + (bank_addr | src_offset);
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	if (src_offset < PAYLOAD_OFFSET) {
		while (bytes >= 4) {
			*dst = le32_to_cpu(__raw_readl(src));
			bytes -= 4;
			src++;
			dst++;
		}
	} else {
		while (bytes >= 4) {
			*dst = __raw_readl(src);
			bytes -= 4;
			src++;
			dst++;
		}
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	}

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	if (!bytes)
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		return;

	/* in case we have 3, 2 or 1 by left. The dst buffer may not be fully
	 * allocated.
	 */
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	if (src_offset < PAYLOAD_OFFSET)
		val = le32_to_cpu(__raw_readl(src));
	else
		val = __raw_readl(src);

	dst_byteptr = (void *) dst;
	src_byteptr = (void *) &val;
	while (bytes > 0) {
		*dst_byteptr = *src_byteptr;
		dst_byteptr++;
		src_byteptr++;
		bytes--;
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	}
}

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static void mem_reads8(void __iomem *src_base, u32 src_offset, void *dst,
								u32 bytes)
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{
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	reg_write32(src_base, HC_MEMORY_REG, src_offset + ISP_BANK(0));
	ndelay(90);
	bank_reads8(src_base, src_offset, ISP_BANK(0), dst, bytes);
}

static void mem_writes8(void __iomem *dst_base, u32 dst_offset,
						__u32 const *src, u32 bytes)
{
	__u32 __iomem *dst;

	dst = dst_base + dst_offset;

	if (dst_offset < PAYLOAD_OFFSET) {
		while (bytes >= 4) {
			__raw_writel(cpu_to_le32(*src), dst);
			bytes -= 4;
			src++;
			dst++;
		}
	} else {
		while (bytes >= 4) {
			__raw_writel(*src, dst);
			bytes -= 4;
			src++;
			dst++;
		}
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	}

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	if (!bytes)
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		return;
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	/* in case we have 3, 2 or 1 bytes left. The buffer is allocated and the
	 * extra bytes should not be read by the HW.
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	 */

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	if (dst_offset < PAYLOAD_OFFSET)
		__raw_writel(cpu_to_le32(*src), dst);
	else
		__raw_writel(*src, dst);
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}

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/*
 * Read and write ptds. 'ptd_offset' should be one of ISO_PTD_OFFSET,
 * INT_PTD_OFFSET, and ATL_PTD_OFFSET. 'slot' should be less than 32.
 */
static void ptd_read(void __iomem *base, u32 ptd_offset, u32 slot,
								struct ptd *ptd)
{
	reg_write32(base, HC_MEMORY_REG,
				ISP_BANK(0) + ptd_offset + slot*sizeof(*ptd));
	ndelay(90);
	bank_reads8(base, ptd_offset + slot*sizeof(*ptd), ISP_BANK(0),
						(void *) ptd, sizeof(*ptd));
}

static void ptd_write(void __iomem *base, u32 ptd_offset, u32 slot,
								struct ptd *ptd)
{
	mem_writes8(base, ptd_offset + slot*sizeof(*ptd) + sizeof(ptd->dw0),
						&ptd->dw1, 7*sizeof(ptd->dw1));
	/* Make sure dw0 gets written last (after other dw's and after payload)
	   since it contains the enable bit */
	wmb();
	mem_writes8(base, ptd_offset + slot*sizeof(*ptd), &ptd->dw0,
							sizeof(ptd->dw0));
}


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/* memory management of the 60kb on the chip from 0x1000 to 0xffff */
static void init_memory(struct isp1760_hcd *priv)
{
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	int i, curr;
	u32 payload_addr;
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	payload_addr = PAYLOAD_OFFSET;
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	for (i = 0; i < BLOCK_1_NUM; i++) {
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		priv->memory_pool[i].start = payload_addr;
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		priv->memory_pool[i].size = BLOCK_1_SIZE;
		priv->memory_pool[i].free = 1;
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		payload_addr += priv->memory_pool[i].size;
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	}

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	curr = i;
	for (i = 0; i < BLOCK_2_NUM; i++) {
		priv->memory_pool[curr + i].start = payload_addr;
		priv->memory_pool[curr + i].size = BLOCK_2_SIZE;
		priv->memory_pool[curr + i].free = 1;
		payload_addr += priv->memory_pool[curr + i].size;
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	}

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	curr = i;
	for (i = 0; i < BLOCK_3_NUM; i++) {
		priv->memory_pool[curr + i].start = payload_addr;
		priv->memory_pool[curr + i].size = BLOCK_3_SIZE;
		priv->memory_pool[curr + i].free = 1;
		payload_addr += priv->memory_pool[curr + i].size;
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	}

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	WARN_ON(payload_addr - priv->memory_pool[0].start > PAYLOAD_AREA_SIZE);
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}

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static void alloc_mem(struct usb_hcd *hcd, struct isp1760_qtd *qtd)
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{
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	struct isp1760_hcd *priv = hcd_to_priv(hcd);
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	int i;

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	WARN_ON(qtd->payload_addr);
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	if (!qtd->length)
		return;
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	for (i = 0; i < BLOCKS; i++) {
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		if (priv->memory_pool[i].size >= qtd->length &&
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				priv->memory_pool[i].free) {
			priv->memory_pool[i].free = 0;
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			qtd->payload_addr = priv->memory_pool[i].start;
			return;
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		}
	}
}

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static void free_mem(struct usb_hcd *hcd, struct isp1760_qtd *qtd)
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{
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	struct isp1760_hcd *priv = hcd_to_priv(hcd);
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	int i;

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	if (!qtd->payload_addr)
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		return;

	for (i = 0; i < BLOCKS; i++) {
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		if (priv->memory_pool[i].start == qtd->payload_addr) {
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			WARN_ON(priv->memory_pool[i].free);
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			priv->memory_pool[i].free = 1;
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			qtd->payload_addr = 0;
			return;
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		}
	}

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	dev_err(hcd->self.controller, "%s: Invalid pointer: %08x\n",
						__func__, qtd->payload_addr);
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	WARN_ON(1);
	qtd->payload_addr = 0;
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}

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static int handshake(struct usb_hcd *hcd, u32 reg,
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		      u32 mask, u32 done, int usec)
{
	u32 result;

	do {
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		result = reg_read32(hcd->regs, reg);
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		if (result == ~0)
			return -ENODEV;
		result &= mask;
		if (result == done)
			return 0;
		udelay(1);
		usec--;
	} while (usec > 0);
	return -ETIMEDOUT;
}

/* reset a non-running (STS_HALT == 1) controller */
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static int ehci_reset(struct usb_hcd *hcd)
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{
	int retval;
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	struct isp1760_hcd *priv = hcd_to_priv(hcd);

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	u32 command = reg_read32(hcd->regs, HC_USBCMD);
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	command |= CMD_RESET;
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	reg_write32(hcd->regs, HC_USBCMD, command);
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	hcd->state = HC_STATE_HALT;
	priv->next_statechange = jiffies;
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	retval = handshake(hcd, HC_USBCMD,
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			    CMD_RESET, 0, 250 * 1000);
	return retval;
}

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static struct isp1760_qh *qh_alloc(gfp_t flags)
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{
	struct isp1760_qh *qh;

	qh = kmem_cache_zalloc(qh_cachep, flags);
	if (!qh)
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		return NULL;
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	INIT_LIST_HEAD(&qh->qh_list);
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	INIT_LIST_HEAD(&qh->qtd_list);
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	qh->slot = -1;

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	return qh;
}

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static void qh_free(struct isp1760_qh *qh)
{
	WARN_ON(!list_empty(&qh->qtd_list));
	WARN_ON(qh->slot > -1);
	kmem_cache_free(qh_cachep, qh);
}
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/* one-time init, only for memory state */
static int priv_init(struct usb_hcd *hcd)
{
	struct isp1760_hcd		*priv = hcd_to_priv(hcd);
	u32			hcc_params;
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	int i;
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	spin_lock_init(&priv->lock);

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	for (i = 0; i < QH_END; i++)
		INIT_LIST_HEAD(&priv->qh_list[i]);
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	/*
	 * hw default: 1K periodic list heads, one per frame.
	 * periodic_size can shrink by USBCMD update if hcc_params allows.
	 */
	priv->periodic_size = DEFAULT_I_TDPS;

	/* controllers may cache some of the periodic schedule ... */
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	hcc_params = reg_read32(hcd->regs, HC_HCCPARAMS);
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	/* full frame cache */
	if (HCC_ISOC_CACHE(hcc_params))
		priv->i_thresh = 8;
	else /* N microframes cached */
		priv->i_thresh = 2 + HCC_ISOC_THRES(hcc_params);

	return 0;
}

static int isp1760_hc_setup(struct usb_hcd *hcd)
{
	struct isp1760_hcd *priv = hcd_to_priv(hcd);
	int result;
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	u32 scratch, hwmode;

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	reg_write32(hcd->regs, HC_SCRATCH_REG, 0xdeadbabe);
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	/* Change bus pattern */
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	scratch = reg_read32(hcd->regs, HC_CHIP_ID_REG);
	scratch = reg_read32(hcd->regs, HC_SCRATCH_REG);
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	if (scratch != 0xdeadbabe) {
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		dev_err(hcd->self.controller, "Scratch test failed.\n");
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		return -ENODEV;
	}

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	/*
	 * The RESET_HC bit in the SW_RESET register is supposed to reset the
	 * host controller without touching the CPU interface registers, but at
	 * least on the ISP1761 it seems to behave as the RESET_ALL bit and
	 * reset the whole device. We thus can't use it here, so let's reset
	 * the host controller through the EHCI USB Command register. The device
	 * has been reset in core code anyway, so this shouldn't matter.
	 */
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	reg_write32(hcd->regs, HC_BUFFER_STATUS_REG, 0);
	reg_write32(hcd->regs, HC_ATL_PTD_SKIPMAP_REG, NO_TRANSFER_ACTIVE);
	reg_write32(hcd->regs, HC_INT_PTD_SKIPMAP_REG, NO_TRANSFER_ACTIVE);
	reg_write32(hcd->regs, HC_ISO_PTD_SKIPMAP_REG, NO_TRANSFER_ACTIVE);
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	result = ehci_reset(hcd);
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	if (result)
		return result;

	/* Step 11 passed */

	/* ATL reset */
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	hwmode = reg_read32(hcd->regs, HC_HW_MODE_CTRL) & ~ALL_ATX_RESET;
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	reg_write32(hcd->regs, HC_HW_MODE_CTRL, hwmode | ALL_ATX_RESET);
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	mdelay(10);
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	reg_write32(hcd->regs, HC_HW_MODE_CTRL, hwmode);
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	reg_write32(hcd->regs, HC_INTERRUPT_ENABLE, INTERRUPT_ENABLE_MASK);
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	priv->hcs_params = reg_read32(hcd->regs, HC_HCSPARAMS);
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	return priv_init(hcd);
}

static u32 base_to_chip(u32 base)
{
	return ((base - 0x400) >> 3);
}

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static int last_qtd_of_urb(struct isp1760_qtd *qtd, struct isp1760_qh *qh)
{
	struct urb *urb;

	if (list_is_last(&qtd->qtd_list, &qh->qtd_list))
		return 1;

	urb = qtd->urb;
	qtd = list_entry(qtd->qtd_list.next, typeof(*qtd), qtd_list);
	return (qtd->urb != urb);
}

528 529 530 531 532 533 534 535 536
/* magic numbers that can affect system performance */
#define	EHCI_TUNE_CERR		3	/* 0-3 qtd retries; 0 == don't stop */
#define	EHCI_TUNE_RL_HS		4	/* nak throttle; see 4.9 */
#define	EHCI_TUNE_RL_TT		0
#define	EHCI_TUNE_MULT_HS	1	/* 1-3 transactions/uframe; 4.10.3 */
#define	EHCI_TUNE_MULT_TT	1
#define	EHCI_TUNE_FLS		2	/* (small) 256 frame schedule */

static void create_ptd_atl(struct isp1760_qh *qh,
537
			struct isp1760_qtd *qtd, struct ptd *ptd)
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{
	u32 maxpacket;
	u32 multi;
	u32 rl = RL_COUNTER;
	u32 nak = NAK_COUNTER;

544 545
	memset(ptd, 0, sizeof(*ptd));

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	/* according to 3.6.2, max packet len can not be > 0x400 */
547 548
	maxpacket = usb_maxpacket(qtd->urb->dev, qtd->urb->pipe,
						usb_pipeout(qtd->urb->pipe));
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	multi =  1 + ((maxpacket >> 11) & 0x3);
	maxpacket &= 0x7ff;

	/* DW0 */
553 554 555 556
	ptd->dw0 = DW0_VALID_BIT;
	ptd->dw0 |= TO_DW0_LENGTH(qtd->length);
	ptd->dw0 |= TO_DW0_MAXPACKET(maxpacket);
	ptd->dw0 |= TO_DW0_ENDPOINT(usb_pipeendpoint(qtd->urb->pipe));
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	/* DW1 */
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	ptd->dw1 = usb_pipeendpoint(qtd->urb->pipe) >> 1;
560 561
	ptd->dw1 |= TO_DW1_DEVICE_ADDR(usb_pipedevice(qtd->urb->pipe));
	ptd->dw1 |= TO_DW1_PID_TOKEN(qtd->packet_type);
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563
	if (usb_pipebulk(qtd->urb->pipe))
564
		ptd->dw1 |= DW1_TRANS_BULK;
565
	else if  (usb_pipeint(qtd->urb->pipe))
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		ptd->dw1 |= DW1_TRANS_INT;
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568
	if (qtd->urb->dev->speed != USB_SPEED_HIGH) {
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		/* split transaction */

571
		ptd->dw1 |= DW1_TRANS_SPLIT;
572
		if (qtd->urb->dev->speed == USB_SPEED_LOW)
573
			ptd->dw1 |= DW1_SE_USB_LOSPEED;
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		ptd->dw1 |= TO_DW1_PORT_NUM(qtd->urb->dev->ttport);
		ptd->dw1 |= TO_DW1_HUB_NUM(qtd->urb->dev->tt->hub->devnum);
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		/* SE bit for Split INT transfers */
579 580
		if (usb_pipeint(qtd->urb->pipe) &&
				(qtd->urb->dev->speed == USB_SPEED_LOW))
581
			ptd->dw1 |= 2 << 16;
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		rl = 0;
		nak = 0;
	} else {
586
		ptd->dw0 |= TO_DW0_MULTI(multi);
587 588
		if (usb_pipecontrol(qtd->urb->pipe) ||
						usb_pipebulk(qtd->urb->pipe))
589
			ptd->dw3 |= TO_DW3_PING(qh->ping);
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	}
	/* DW2 */
592
	ptd->dw2 = 0;
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	ptd->dw2 |= TO_DW2_DATA_START_ADDR(base_to_chip(qtd->payload_addr));
	ptd->dw2 |= TO_DW2_RL(rl);
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	/* DW3 */
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	ptd->dw3 |= TO_DW3_NAKCOUNT(nak);
	ptd->dw3 |= TO_DW3_DATA_TOGGLE(qh->toggle);
599 600
	if (usb_pipecontrol(qtd->urb->pipe)) {
		if (qtd->data_buffer == qtd->urb->setup_packet)
601
			ptd->dw3 &= ~TO_DW3_DATA_TOGGLE(1);
602
		else if (last_qtd_of_urb(qtd, qh))
603
			ptd->dw3 |= TO_DW3_DATA_TOGGLE(1);
604
	}
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	ptd->dw3 |= DW3_ACTIVE_BIT;
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	/* Cerr */
608
	ptd->dw3 |= TO_DW3_CERR(ERR_COUNTER);
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}

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static void transform_add_int(struct isp1760_qh *qh,
612
			struct isp1760_qtd *qtd, struct ptd *ptd)
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{
614
	u32 usof;
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	u32 period;

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	/*
	 * Most of this is guessing. ISP1761 datasheet is quite unclear, and
	 * the algorithm from the original Philips driver code, which was
	 * pretty much used in this driver before as well, is quite horrendous
	 * and, i believe, incorrect. The code below follows the datasheet and
	 * USB2.0 spec as far as I can tell, and plug/unplug seems to be much
	 * more reliable this way (fingers crossed...).
	 */
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	if (qtd->urb->dev->speed == USB_SPEED_HIGH) {
		/* urb->interval is in units of microframes (1/8 ms) */
		period = qtd->urb->interval >> 3;

		if (qtd->urb->interval > 4)
			usof = 0x01; /* One bit set =>
						interval 1 ms * uFrame-match */
		else if (qtd->urb->interval > 2)
			usof = 0x22; /* Two bits set => interval 1/2 ms */
		else if (qtd->urb->interval > 1)
			usof = 0x55; /* Four bits set => interval 1/4 ms */
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		else
638
			usof = 0xff; /* All bits set => interval 1/8 ms */
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	} else {
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		/* urb->interval is in units of frames (1 ms) */
		period = qtd->urb->interval;
		usof = 0x0f;		/* Execute Start Split on any of the
					   four first uFrames */

		/*
		 * First 8 bits in dw5 is uSCS and "specifies which uSOF the
		 * complete split needs to be sent. Valid only for IN." Also,
		 * "All bits can be set to one for every transfer." (p 82,
		 * ISP1761 data sheet.) 0x1c is from Philips driver. Where did
		 * that number come from? 0xff seems to work fine...
		 */
		/* ptd->dw5 = 0x1c; */
		ptd->dw5 = 0xff; /* Execute Complete Split on any uFrame */
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	}

656 657 658
	period = period >> 1;/* Ensure equal or shorter period than requested */
	period &= 0xf8; /* Mask off too large values and lowest unused 3 bits */

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	ptd->dw2 |= period;
	ptd->dw4 = usof;
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}

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static void create_ptd_int(struct isp1760_qh *qh,
664
			struct isp1760_qtd *qtd, struct ptd *ptd)
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{
666
	create_ptd_atl(qh, qtd, ptd);
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	transform_add_int(qh, qtd, ptd);
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}

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static void isp1760_urb_done(struct usb_hcd *hcd, struct urb *urb)
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__releases(priv->lock)
__acquires(priv->lock)
{
674 675
	struct isp1760_hcd *priv = hcd_to_priv(hcd);

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	if (!urb->unlinked) {
677 678
		if (urb->status == -EINPROGRESS)
			urb->status = 0;
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	}

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	if (usb_pipein(urb->pipe) && usb_pipetype(urb->pipe) != PIPE_CONTROL) {
		void *ptr;
		for (ptr = urb->transfer_buffer;
		     ptr < urb->transfer_buffer + urb->transfer_buffer_length;
		     ptr += PAGE_SIZE)
			flush_dcache_page(virt_to_page(ptr));
	}

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	/* complete() can reenter this HCD */
690
	usb_hcd_unlink_urb_from_ep(hcd, urb);
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	spin_unlock(&priv->lock);
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	usb_hcd_giveback_urb(hcd, urb, urb->status);
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	spin_lock(&priv->lock);
}

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static struct isp1760_qtd *qtd_alloc(gfp_t flags, struct urb *urb,
								u8 packet_type)
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{
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	struct isp1760_qtd *qtd;

	qtd = kmem_cache_zalloc(qtd_cachep, flags);
	if (!qtd)
		return NULL;

	INIT_LIST_HEAD(&qtd->qtd_list);
	qtd->urb = urb;
	qtd->packet_type = packet_type;
708 709
	qtd->status = QTD_ENQUEUED;
	qtd->actual_length = 0;
710 711 712 713 714 715 716

	return qtd;
}

static void qtd_free(struct isp1760_qtd *qtd)
{
	WARN_ON(qtd->payload_addr);
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	kmem_cache_free(qtd_cachep, qtd);
}

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static void start_bus_transfer(struct usb_hcd *hcd, u32 ptd_offset, int slot,
721 722 723
				struct isp1760_slotinfo *slots,
				struct isp1760_qtd *qtd, struct isp1760_qh *qh,
				struct ptd *ptd)
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{
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	struct isp1760_hcd *priv = hcd_to_priv(hcd);
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	int skip_map;

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	WARN_ON((slot < 0) || (slot > 31));
	WARN_ON(qtd->length && !qtd->payload_addr);
	WARN_ON(slots[slot].qtd);
	WARN_ON(slots[slot].qh);
	WARN_ON(qtd->status != QTD_PAYLOAD_ALLOC);

734 735 736 737
	/* Make sure done map has not triggered from some unlinked transfer */
	if (ptd_offset == ATL_PTD_OFFSET) {
		priv->atl_done_map |= reg_read32(hcd->regs,
						HC_ATL_PTD_DONEMAP_REG);
738 739 740 741 742 743
		priv->atl_done_map &= ~(1 << slot);
	} else {
		priv->int_done_map |= reg_read32(hcd->regs,
						HC_INT_PTD_DONEMAP_REG);
		priv->int_done_map &= ~(1 << slot);
	}
744

745 746 747 748 749 750 751 752
	qh->slot = slot;
	qtd->status = QTD_XFER_STARTED;
	slots[slot].timestamp = jiffies;
	slots[slot].qtd = qtd;
	slots[slot].qh = qh;
	ptd_write(hcd->regs, ptd_offset, slot, ptd);

	if (ptd_offset == ATL_PTD_OFFSET) {
753 754 755 756 757 758 759 760
		skip_map = reg_read32(hcd->regs, HC_ATL_PTD_SKIPMAP_REG);
		skip_map &= ~(1 << qh->slot);
		reg_write32(hcd->regs, HC_ATL_PTD_SKIPMAP_REG, skip_map);
	} else {
		skip_map = reg_read32(hcd->regs, HC_INT_PTD_SKIPMAP_REG);
		skip_map &= ~(1 << qh->slot);
		reg_write32(hcd->regs, HC_INT_PTD_SKIPMAP_REG, skip_map);
	}
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}

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static int is_short_bulk(struct isp1760_qtd *qtd)
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{
765 766
	return (usb_pipebulk(qtd->urb->pipe) &&
					(qtd->actual_length < qtd->length));
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}

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static void collect_qtds(struct usb_hcd *hcd, struct isp1760_qh *qh,
						struct list_head *urb_list)
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{
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	int last_qtd;
	struct isp1760_qtd *qtd, *qtd_next;
	struct urb_listitem *urb_listitem;
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	list_for_each_entry_safe(qtd, qtd_next, &qh->qtd_list, qtd_list) {
		if (qtd->status < QTD_XFER_COMPLETE)
			break;
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		last_qtd = last_qtd_of_urb(qtd, qh);
781 782 783 784 785 786 787 788 789 790 791 792 793 794 795 796 797 798 799 800

		if ((!last_qtd) && (qtd->status == QTD_RETIRE))
			qtd_next->status = QTD_RETIRE;

		if (qtd->status == QTD_XFER_COMPLETE) {
			if (qtd->actual_length) {
				switch (qtd->packet_type) {
				case IN_PID:
					mem_reads8(hcd->regs, qtd->payload_addr,
							qtd->data_buffer,
							qtd->actual_length);
					/* Fall through (?) */
				case OUT_PID:
					qtd->urb->actual_length +=
							qtd->actual_length;
					/* Fall through ... */
				case SETUP_PID:
					break;
				}
			}
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			if (is_short_bulk(qtd)) {
				if (qtd->urb->transfer_flags & URB_SHORT_NOT_OK)
					qtd->urb->status = -EREMOTEIO;
				if (!last_qtd)
					qtd_next->status = QTD_RETIRE;
			}
		}
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810 811
		if (qtd->payload_addr)
			free_mem(hcd, qtd);
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813 814 815 816 817 818 819 820
		if (last_qtd) {
			if ((qtd->status == QTD_RETIRE) &&
					(qtd->urb->status == -EINPROGRESS))
				qtd->urb->status = -EPIPE;
			/* Defer calling of urb_done() since it releases lock */
			urb_listitem = kmem_cache_zalloc(urb_listitem_cachep,
								GFP_ATOMIC);
			if (unlikely(!urb_listitem))
821
				break; /* Try again on next call */
822 823 824
			urb_listitem->urb = qtd->urb;
			list_add_tail(&urb_listitem->urb_list, urb_list);
		}
825

826 827 828 829
		list_del(&qtd->qtd_list);
		qtd_free(qtd);
	}
}
830

831 832 833 834 835
#define ENQUEUE_DEPTH	2
static void enqueue_qtds(struct usb_hcd *hcd, struct isp1760_qh *qh)
{
	struct isp1760_hcd *priv = hcd_to_priv(hcd);
	int ptd_offset;
836
	struct isp1760_slotinfo *slots;
837 838 839 840
	int curr_slot, free_slot;
	int n;
	struct ptd ptd;
	struct isp1760_qtd *qtd;
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	if (unlikely(list_empty(&qh->qtd_list))) {
		WARN_ON(1);
		return;
	}
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847 848 849 850
	/* Make sure this endpoint's TT buffer is clean before queueing ptds */
	if (qh->tt_buffer_dirty)
		return;

851 852 853 854 855 856 857 858
	if (usb_pipeint(list_entry(qh->qtd_list.next, struct isp1760_qtd,
							qtd_list)->urb->pipe)) {
		ptd_offset = INT_PTD_OFFSET;
		slots = priv->int_slots;
	} else {
		ptd_offset = ATL_PTD_OFFSET;
		slots = priv->atl_slots;
	}
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860 861 862 863 864 865 866
	free_slot = -1;
	for (curr_slot = 0; curr_slot < 32; curr_slot++) {
		if ((free_slot == -1) && (slots[curr_slot].qtd == NULL))
			free_slot = curr_slot;
		if (slots[curr_slot].qh == qh)
			break;
	}
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868 869 870 871 872 873 874
	n = 0;
	list_for_each_entry(qtd, &qh->qtd_list, qtd_list) {
		if (qtd->status == QTD_ENQUEUED) {
			WARN_ON(qtd->payload_addr);
			alloc_mem(hcd, qtd);
			if ((qtd->length) && (!qtd->payload_addr))
				break;
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876 877 878 879 880 881
			if ((qtd->length) &&
			    ((qtd->packet_type == SETUP_PID) ||
			     (qtd->packet_type == OUT_PID))) {
				mem_writes8(hcd->regs, qtd->payload_addr,
						qtd->data_buffer, qtd->length);
			}
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883
			qtd->status = QTD_PAYLOAD_ALLOC;
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		}

886 887 888 889 890 891 892 893 894 895 896 897 898 899 900 901 902
		if (qtd->status == QTD_PAYLOAD_ALLOC) {
/*
			if ((curr_slot > 31) && (free_slot == -1))
				dev_dbg(hcd->self.controller, "%s: No slot "
					"available for transfer\n", __func__);
*/
			/* Start xfer for this endpoint if not already done */
			if ((curr_slot > 31) && (free_slot > -1)) {
				if (usb_pipeint(qtd->urb->pipe))
					create_ptd_int(qh, qtd, &ptd);
				else
					create_ptd_atl(qh, qtd, &ptd);

				start_bus_transfer(hcd, ptd_offset, free_slot,
							slots, qtd, qh, &ptd);
				curr_slot = free_slot;
			}
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			n++;
			if (n >= ENQUEUE_DEPTH)
				break;
		}
	}
}
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911
static void schedule_ptds(struct usb_hcd *hcd)
912 913 914 915 916 917
{
	struct isp1760_hcd *priv;
	struct isp1760_qh *qh, *qh_next;
	struct list_head *ep_queue;
	LIST_HEAD(urb_list);
	struct urb_listitem *urb_listitem, *urb_listitem_next;
918
	int i;
919 920 921 922 923

	if (!hcd) {
		WARN_ON(1);
		return;
	}
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925
	priv = hcd_to_priv(hcd);
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927 928 929
	/*
	 * check finished/retired xfers, transfer payloads, call urb_done()
	 */
930 931
	for (i = 0; i < QH_END; i++) {
		ep_queue = &priv->qh_list[i];
932 933
		list_for_each_entry_safe(qh, qh_next, ep_queue, qh_list) {
			collect_qtds(hcd, qh, &urb_list);
934
			if (list_empty(&qh->qtd_list))
935
				list_del(&qh->qh_list);
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		}
937
	}
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939 940 941 942 943
	list_for_each_entry_safe(urb_listitem, urb_listitem_next, &urb_list,
								urb_list) {
		isp1760_urb_done(hcd, urb_listitem->urb);
		kmem_cache_free(urb_listitem_cachep, urb_listitem);
	}
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945 946 947 948 949 950 951 952 953 954 955 956 957 958 959 960 961 962 963 964 965 966 967 968
	/*
	 * Schedule packets for transfer.
	 *
	 * According to USB2.0 specification:
	 *
	 * 1st prio: interrupt xfers, up to 80 % of bandwidth
	 * 2nd prio: control xfers
	 * 3rd prio: bulk xfers
	 *
	 * ... but let's use a simpler scheme here (mostly because ISP1761 doc
	 * is very unclear on how to prioritize traffic):
	 *
	 * 1) Enqueue any queued control transfers, as long as payload chip mem
	 *    and PTD ATL slots are available.
	 * 2) Enqueue any queued INT transfers, as long as payload chip mem
	 *    and PTD INT slots are available.
	 * 3) Enqueue any queued bulk transfers, as long as payload chip mem
	 *    and PTD ATL slots are available.
	 *
	 * Use double buffering (ENQUEUE_DEPTH==2) as a compromise between
	 * conservation of chip mem and performance.
	 *
	 * I'm sure this scheme could be improved upon!
	 */
969 970
	for (i = 0; i < QH_END; i++) {
		ep_queue = &priv->qh_list[i];
971 972 973 974
		list_for_each_entry_safe(qh, qh_next, ep_queue, qh_list)
			enqueue_qtds(hcd, qh);
	}
}
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#define PTD_STATE_QTD_DONE	1
#define PTD_STATE_QTD_RELOAD	2
#define PTD_STATE_URB_RETIRE	3
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static int check_int_transfer(struct usb_hcd *hcd, struct ptd *ptd,
								struct urb *urb)
{
	__dw dw4;
	int i;
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986 987
	dw4 = ptd->dw4;
	dw4 >>= 8;
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989 990
	/* FIXME: ISP1761 datasheet does not say what to do with these. Do we
	   need to handle these errors? Is it done in hardware? */
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992
	if (ptd->dw3 & DW3_HALT_BIT) {
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994
		urb->status = -EPROTO; /* Default unknown error */
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996 997 998 999 1000 1001 1002 1003 1004 1005 1006 1007 1008 1009 1010 1011 1012 1013 1014 1015 1016 1017 1018 1019
		for (i = 0; i < 8; i++) {
			switch (dw4 & 0x7) {
			case INT_UNDERRUN:
				dev_dbg(hcd->self.controller, "%s: underrun "
						"during uFrame %d\n",
						__func__, i);
				urb->status = -ECOMM; /* Could not write data */
				break;
			case INT_EXACT:
				dev_dbg(hcd->self.controller, "%s: transaction "
						"error during uFrame %d\n",
						__func__, i);
				urb->status = -EPROTO; /* timeout, bad CRC, PID
							  error etc. */
				break;
			case INT_BABBLE:
				dev_dbg(hcd->self.controller, "%s: babble "
						"error during uFrame %d\n",
						__func__, i);
				urb->status = -EOVERFLOW;
				break;
			}
			dw4 >>= 3;
		}
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1021 1022
		return PTD_STATE_URB_RETIRE;
	}
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1023

1024 1025
	return PTD_STATE_QTD_DONE;
}
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1026

1027 1028 1029 1030 1031 1032 1033 1034 1035 1036 1037 1038 1039 1040 1041 1042 1043 1044 1045 1046 1047 1048 1049
static int check_atl_transfer(struct usb_hcd *hcd, struct ptd *ptd,
								struct urb *urb)
{
	WARN_ON(!ptd);
	if (ptd->dw3 & DW3_HALT_BIT) {
		if (ptd->dw3 & DW3_BABBLE_BIT)
			urb->status = -EOVERFLOW;
		else if (FROM_DW3_CERR(ptd->dw3))
			urb->status = -EPIPE;  /* Stall */
		else if (ptd->dw3 & DW3_ERROR_BIT)
			urb->status = -EPROTO; /* XactErr */
		else
			urb->status = -EPROTO; /* Unknown */
/*
		dev_dbg(hcd->self.controller, "%s: ptd error:\n"
			"        dw0: %08x dw1: %08x dw2: %08x dw3: %08x\n"
			"        dw4: %08x dw5: %08x dw6: %08x dw7: %08x\n",
			__func__,
			ptd->dw0, ptd->dw1, ptd->dw2, ptd->dw3,
			ptd->dw4, ptd->dw5, ptd->dw6, ptd->dw7);
*/
		return PTD_STATE_URB_RETIRE;
	}
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1051 1052 1053 1054 1055
	if ((ptd->dw3 & DW3_ERROR_BIT) && (ptd->dw3 & DW3_ACTIVE_BIT)) {
		/* Transfer Error, *but* active and no HALT -> reload */
		dev_dbg(hcd->self.controller, "PID error; reloading ptd\n");
		return PTD_STATE_QTD_RELOAD;
	}
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1056

1057 1058 1059 1060 1061 1062 1063
	if (!FROM_DW3_NAKCOUNT(ptd->dw3) && (ptd->dw3 & DW3_ACTIVE_BIT)) {
		/*
		 * NAKs are handled in HW by the chip. Usually if the
		 * device is not able to send data fast enough.
		 * This happens mostly on slower hardware.
		 */
		return PTD_STATE_QTD_RELOAD;
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1064
	}
1065 1066

	return PTD_STATE_QTD_DONE;
S
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1067 1068
}

1069
static void handle_done_ptds(struct usb_hcd *hcd)
S
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1070
{
1071
	struct isp1760_hcd *priv = hcd_to_priv(hcd);
S
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1072 1073
	struct ptd ptd;
	struct isp1760_qh *qh;
1074 1075
	int slot;
	int state;
1076
	struct isp1760_slotinfo *slots;
1077 1078 1079
	u32 ptd_offset;
	struct isp1760_qtd *qtd;
	int modified;
1080
	int skip_map;
1081

1082 1083 1084 1085
	skip_map = reg_read32(hcd->regs, HC_INT_PTD_SKIPMAP_REG);
	priv->int_done_map &= ~skip_map;
	skip_map = reg_read32(hcd->regs, HC_ATL_PTD_SKIPMAP_REG);
	priv->atl_done_map &= ~skip_map;
1086

1087
	modified = priv->int_done_map || priv->atl_done_map;
1088 1089 1090

	while (priv->int_done_map || priv->atl_done_map) {
		if (priv->int_done_map) {
1091
			/* INT ptd */
1092 1093
			slot = __ffs(priv->int_done_map);
			priv->int_done_map &= ~(1 << slot);
1094
			slots = priv->int_slots;
1095 1096 1097 1098
			/* This should not trigger, and could be removed if
			   noone have any problems with it triggering: */
			if (!slots[slot].qh) {
				WARN_ON(1);
1099
				continue;
1100
			}
1101 1102 1103 1104
			ptd_offset = INT_PTD_OFFSET;
			ptd_read(hcd->regs, INT_PTD_OFFSET, slot, &ptd);
			state = check_int_transfer(hcd, &ptd,
							slots[slot].qtd->urb);
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1105
		} else {
1106
			/* ATL ptd */
1107 1108
			slot = __ffs(priv->atl_done_map);
			priv->atl_done_map &= ~(1 << slot);
1109
			slots = priv->atl_slots;
1110 1111 1112 1113
			/* This should not trigger, and could be removed if
			   noone have any problems with it triggering: */
			if (!slots[slot].qh) {
				WARN_ON(1);
1114
				continue;
1115
			}
1116 1117 1118 1119
			ptd_offset = ATL_PTD_OFFSET;
			ptd_read(hcd->regs, ATL_PTD_OFFSET, slot, &ptd);
			state = check_atl_transfer(hcd, &ptd,
							slots[slot].qtd->urb);
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1120 1121
		}

1122 1123 1124 1125 1126 1127 1128 1129 1130 1131 1132 1133 1134 1135 1136 1137 1138
		qtd = slots[slot].qtd;
		slots[slot].qtd = NULL;
		qh = slots[slot].qh;
		slots[slot].qh = NULL;
		qh->slot = -1;

		WARN_ON(qtd->status != QTD_XFER_STARTED);

		switch (state) {
		case PTD_STATE_QTD_DONE:
			if ((usb_pipeint(qtd->urb->pipe)) &&
				       (qtd->urb->dev->speed != USB_SPEED_HIGH))
				qtd->actual_length =
				       FROM_DW3_SCS_NRBYTESTRANSFERRED(ptd.dw3);
			else
				qtd->actual_length =
					FROM_DW3_NRBYTESTRANSFERRED(ptd.dw3);
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1139

1140 1141 1142 1143 1144 1145 1146
			qtd->status = QTD_XFER_COMPLETE;
			if (list_is_last(&qtd->qtd_list, &qh->qtd_list) ||
							is_short_bulk(qtd))
				qtd = NULL;
			else
				qtd = list_entry(qtd->qtd_list.next,
							typeof(*qtd), qtd_list);
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1147

1148 1149 1150
			qh->toggle = FROM_DW3_DATA_TOGGLE(ptd.dw3);
			qh->ping = FROM_DW3_PING(ptd.dw3);
			break;
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1151

1152 1153 1154 1155 1156 1157 1158 1159 1160 1161 1162
		case PTD_STATE_QTD_RELOAD: /* QTD_RETRY, for atls only */
			qtd->status = QTD_PAYLOAD_ALLOC;
			ptd.dw0 |= DW0_VALID_BIT;
			/* RL counter = ERR counter */
			ptd.dw3 &= ~TO_DW3_NAKCOUNT(0xf);
			ptd.dw3 |= TO_DW3_NAKCOUNT(FROM_DW2_RL(ptd.dw2));
			ptd.dw3 &= ~TO_DW3_CERR(3);
			ptd.dw3 |= TO_DW3_CERR(ERR_COUNTER);
			qh->toggle = FROM_DW3_DATA_TOGGLE(ptd.dw3);
			qh->ping = FROM_DW3_PING(ptd.dw3);
			break;
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1163

1164 1165
		case PTD_STATE_URB_RETIRE:
			qtd->status = QTD_RETIRE;
1166 1167 1168 1169 1170 1171 1172 1173 1174
			if ((qtd->urb->dev->speed != USB_SPEED_HIGH) &&
					(qtd->urb->status != -EPIPE) &&
					(qtd->urb->status != -EREMOTEIO)) {
				qh->tt_buffer_dirty = 1;
				if (usb_hub_clear_tt_buffer(qtd->urb))
					/* Clear failed; let's hope things work
					   anyway */
					qh->tt_buffer_dirty = 0;
			}
1175 1176 1177 1178
			qtd = NULL;
			qh->toggle = 0;
			qh->ping = 0;
			break;
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1179

1180 1181 1182 1183
		default:
			WARN_ON(1);
			continue;
		}
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1184

1185 1186 1187 1188 1189 1190 1191 1192 1193 1194 1195 1196
		if (qtd && (qtd->status == QTD_PAYLOAD_ALLOC)) {
			if (slots == priv->int_slots) {
				if (state == PTD_STATE_QTD_RELOAD)
					dev_err(hcd->self.controller,
						"%s: PTD_STATE_QTD_RELOAD on "
						"interrupt packet\n", __func__);
				if (state != PTD_STATE_QTD_RELOAD)
					create_ptd_int(qh, qtd, &ptd);
			} else {
				if (state != PTD_STATE_QTD_RELOAD)
					create_ptd_atl(qh, qtd, &ptd);
			}
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1198 1199 1200 1201
			start_bus_transfer(hcd, ptd_offset, slot, slots, qtd,
				qh, &ptd);
		}
	}
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1202

1203 1204
	if (modified)
		schedule_ptds(hcd);
1205
}
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1206

1207 1208 1209 1210 1211
static irqreturn_t isp1760_irq(struct usb_hcd *hcd)
{
	struct isp1760_hcd *priv = hcd_to_priv(hcd);
	u32 imask;
	irqreturn_t irqret = IRQ_NONE;
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1212

1213 1214 1215 1216 1217 1218 1219 1220 1221 1222 1223 1224 1225 1226
	spin_lock(&priv->lock);

	if (!(hcd->state & HC_STATE_RUNNING))
		goto leave;

	imask = reg_read32(hcd->regs, HC_INTERRUPT_REG);
	if (unlikely(!imask))
		goto leave;
	reg_write32(hcd->regs, HC_INTERRUPT_REG, imask); /* Clear */

	priv->int_done_map |= reg_read32(hcd->regs, HC_INT_PTD_DONEMAP_REG);
	priv->atl_done_map |= reg_read32(hcd->regs, HC_ATL_PTD_DONEMAP_REG);

	handle_done_ptds(hcd);
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1227

1228 1229 1230
	irqret = IRQ_HANDLED;
leave:
	spin_unlock(&priv->lock);
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1231

1232
	return irqret;
S
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1233 1234
}

1235 1236 1237 1238 1239 1240 1241 1242 1243 1244 1245 1246 1247 1248 1249 1250 1251 1252 1253 1254 1255 1256 1257 1258 1259
/*
 * Workaround for problem described in chip errata 2:
 *
 * Sometimes interrupts are not generated when ATL (not INT?) completion occurs.
 * One solution suggested in the errata is to use SOF interrupts _instead_of_
 * ATL done interrupts (the "instead of" might be important since it seems
 * enabling ATL interrupts also causes the chip to sometimes - rarely - "forget"
 * to set the PTD's done bit in addition to not generating an interrupt!).
 *
 * So if we use SOF + ATL interrupts, we sometimes get stale PTDs since their
 * done bit is not being set. This is bad - it blocks the endpoint until reboot.
 *
 * If we use SOF interrupts only, we get latency between ptd completion and the
 * actual handling. This is very noticeable in testusb runs which takes several
 * minutes longer without ATL interrupts.
 *
 * A better solution is to run the code below every SLOT_CHECK_PERIOD ms. If it
 * finds active ATL slots which are older than SLOT_TIMEOUT ms, it checks the
 * slot's ACTIVE and VALID bits. If these are not set, the ptd is considered
 * completed and its done map bit is set.
 *
 * The values of SLOT_TIMEOUT and SLOT_CHECK_PERIOD have been arbitrarily chosen
 * not to cause too much lag when this HW bug occurs, while still hopefully
 * ensuring that the check does not falsely trigger.
 */
1260
#define SLOT_TIMEOUT 300
1261 1262 1263
#define SLOT_CHECK_PERIOD 200
static struct timer_list errata2_timer;

1264
static void errata2_function(unsigned long data)
1265 1266 1267 1268 1269 1270 1271 1272 1273 1274
{
	struct usb_hcd *hcd = (struct usb_hcd *) data;
	struct isp1760_hcd *priv = hcd_to_priv(hcd);
	int slot;
	struct ptd ptd;
	unsigned long spinflags;

	spin_lock_irqsave(&priv->lock, spinflags);

	for (slot = 0; slot < 32; slot++)
1275 1276
		if (priv->atl_slots[slot].qh && time_after(jiffies,
					priv->atl_slots[slot].timestamp +
1277
					msecs_to_jiffies(SLOT_TIMEOUT))) {
1278 1279 1280 1281 1282 1283
			ptd_read(hcd->regs, ATL_PTD_OFFSET, slot, &ptd);
			if (!FROM_DW0_VALID(ptd.dw0) &&
					!FROM_DW3_ACTIVE(ptd.dw3))
				priv->atl_done_map |= 1 << slot;
		}

1284 1285
	if (priv->atl_done_map)
		handle_done_ptds(hcd);
1286 1287 1288

	spin_unlock_irqrestore(&priv->lock, spinflags);

1289
	errata2_timer.expires = jiffies + msecs_to_jiffies(SLOT_CHECK_PERIOD);
1290 1291 1292
	add_timer(&errata2_timer);
}

1293 1294 1295 1296 1297 1298 1299 1300 1301 1302 1303 1304 1305 1306 1307 1308 1309 1310 1311 1312 1313 1314 1315 1316 1317 1318 1319 1320 1321 1322 1323 1324 1325 1326 1327 1328 1329 1330 1331 1332 1333 1334 1335 1336 1337
static int isp1760_run(struct usb_hcd *hcd)
{
	int retval;
	u32 temp;
	u32 command;
	u32 chipid;

	hcd->uses_new_polling = 1;

	hcd->state = HC_STATE_RUNNING;

	/* Set PTD interrupt AND & OR maps */
	reg_write32(hcd->regs, HC_ATL_IRQ_MASK_AND_REG, 0);
	reg_write32(hcd->regs, HC_ATL_IRQ_MASK_OR_REG, 0xffffffff);
	reg_write32(hcd->regs, HC_INT_IRQ_MASK_AND_REG, 0);
	reg_write32(hcd->regs, HC_INT_IRQ_MASK_OR_REG, 0xffffffff);
	reg_write32(hcd->regs, HC_ISO_IRQ_MASK_AND_REG, 0);
	reg_write32(hcd->regs, HC_ISO_IRQ_MASK_OR_REG, 0xffffffff);
	/* step 23 passed */

	temp = reg_read32(hcd->regs, HC_HW_MODE_CTRL);
	reg_write32(hcd->regs, HC_HW_MODE_CTRL, temp | HW_GLOBAL_INTR_EN);

	command = reg_read32(hcd->regs, HC_USBCMD);
	command &= ~(CMD_LRESET|CMD_RESET);
	command |= CMD_RUN;
	reg_write32(hcd->regs, HC_USBCMD, command);

	retval = handshake(hcd, HC_USBCMD, CMD_RUN, CMD_RUN, 250 * 1000);
	if (retval)
		return retval;

	/*
	 * XXX
	 * Spec says to write FLAG_CF as last config action, priv code grabs
	 * the semaphore while doing so.
	 */
	down_write(&ehci_cf_port_reset_rwsem);
	reg_write32(hcd->regs, HC_CONFIGFLAG, FLAG_CF);

	retval = handshake(hcd, HC_CONFIGFLAG, FLAG_CF, FLAG_CF, 250 * 1000);
	up_write(&ehci_cf_port_reset_rwsem);
	if (retval)
		return retval;

J
Julia Lawall 已提交
1338
	setup_timer(&errata2_timer, errata2_function, (unsigned long)hcd);
1339
	errata2_timer.expires = jiffies + msecs_to_jiffies(SLOT_CHECK_PERIOD);
1340 1341
	add_timer(&errata2_timer);

1342 1343 1344 1345 1346 1347 1348 1349 1350 1351 1352 1353 1354 1355 1356 1357 1358 1359 1360 1361 1362 1363 1364
	chipid = reg_read32(hcd->regs, HC_CHIP_ID_REG);
	dev_info(hcd->self.controller, "USB ISP %04x HW rev. %d started\n",
					chipid & 0xffff, chipid >> 16);

	/* PTD Register Init Part 2, Step 28 */

	/* Setup registers controlling PTD checking */
	reg_write32(hcd->regs, HC_ATL_PTD_LASTPTD_REG, 0x80000000);
	reg_write32(hcd->regs, HC_INT_PTD_LASTPTD_REG, 0x80000000);
	reg_write32(hcd->regs, HC_ISO_PTD_LASTPTD_REG, 0x00000001);
	reg_write32(hcd->regs, HC_ATL_PTD_SKIPMAP_REG, 0xffffffff);
	reg_write32(hcd->regs, HC_INT_PTD_SKIPMAP_REG, 0xffffffff);
	reg_write32(hcd->regs, HC_ISO_PTD_SKIPMAP_REG, 0xffffffff);
	reg_write32(hcd->regs, HC_BUFFER_STATUS_REG,
						ATL_BUF_FILL | INT_BUF_FILL);

	/* GRR this is run-once init(), being done every time the HC starts.
	 * So long as they're part of class devices, we can't do it init()
	 * since the class device isn't created that early.
	 */
	return 0;
}

1365
static int qtd_fill(struct isp1760_qtd *qtd, void *databuffer, size_t len)
S
Sebastian Siewior 已提交
1366
{
1367
	qtd->data_buffer = databuffer;
S
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1368

1369 1370 1371
	if (len > MAX_PAYLOAD_SIZE)
		len = MAX_PAYLOAD_SIZE;
	qtd->length = len;
S
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1372

1373
	return qtd->length;
S
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1374 1375
}

1376
static void qtd_list_free(struct list_head *qtd_list)
S
Sebastian Siewior 已提交
1377
{
1378
	struct isp1760_qtd *qtd, *qtd_next;
S
Sebastian Siewior 已提交
1379

1380
	list_for_each_entry_safe(qtd, qtd_next, qtd_list, qtd_list) {
S
Sebastian Siewior 已提交
1381
		list_del(&qtd->qtd_list);
1382
		qtd_free(qtd);
S
Sebastian Siewior 已提交
1383 1384 1385 1386
	}
}

/*
1387 1388
 * Packetize urb->transfer_buffer into list of packets of size wMaxPacketSize.
 * Also calculate the PID type (SETUP/IN/OUT) for each packet.
S
Sebastian Siewior 已提交
1389
 */
1390
#define max_packet(wMaxPacketSize) ((wMaxPacketSize) & 0x07ff)
1391
static void packetize_urb(struct usb_hcd *hcd,
S
Sebastian Siewior 已提交
1392 1393
		struct urb *urb, struct list_head *head, gfp_t flags)
{
1394
	struct isp1760_qtd *qtd;
S
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1395
	void *buf;
1396 1397
	int len, maxpacketsize;
	u8 packet_type;
S
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1398 1399 1400 1401 1402

	/*
	 * URBs map to sequences of QTDs:  one logical transaction
	 */

1403 1404 1405 1406 1407 1408 1409 1410
	if (!urb->transfer_buffer && urb->transfer_buffer_length) {
		/* XXX This looks like usb storage / SCSI bug */
		dev_err(hcd->self.controller,
				"buf is null, dma is %08lx len is %d\n",
				(long unsigned)urb->transfer_dma,
				urb->transfer_buffer_length);
		WARN_ON(1);
	}
S
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1411

1412 1413 1414 1415
	if (usb_pipein(urb->pipe))
		packet_type = IN_PID;
	else
		packet_type = OUT_PID;
S
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1416 1417

	if (usb_pipecontrol(urb->pipe)) {
1418
		qtd = qtd_alloc(flags, urb, SETUP_PID);
S
Sebastian Siewior 已提交
1419 1420
		if (!qtd)
			goto cleanup;
1421
		qtd_fill(qtd, urb->setup_packet, sizeof(struct usb_ctrlrequest));
S
Sebastian Siewior 已提交
1422 1423 1424
		list_add_tail(&qtd->qtd_list, head);

		/* for zero length DATA stages, STATUS is always IN */
1425 1426
		if (urb->transfer_buffer_length == 0)
			packet_type = IN_PID;
S
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1427 1428
	}

1429 1430
	maxpacketsize = max_packet(usb_maxpacket(urb->dev, urb->pipe,
						usb_pipeout(urb->pipe)));
S
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1431 1432 1433 1434 1435 1436

	/*
	 * buffer gets wrapped in one or more qtds;
	 * last one may be "short" (including zero len)
	 * and may serve as a control status ack
	 */
1437 1438 1439
	buf = urb->transfer_buffer;
	len = urb->transfer_buffer_length;

S
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1440 1441 1442
	for (;;) {
		int this_qtd_len;

1443 1444 1445 1446 1447
		qtd = qtd_alloc(flags, urb, packet_type);
		if (!qtd)
			goto cleanup;
		this_qtd_len = qtd_fill(qtd, buf, len);
		list_add_tail(&qtd->qtd_list, head);
S
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1448 1449 1450 1451 1452 1453 1454 1455 1456 1457 1458 1459 1460 1461 1462 1463 1464

		len -= this_qtd_len;
		buf += this_qtd_len;

		if (len <= 0)
			break;
	}

	/*
	 * control requests may need a terminating data "status" ack;
	 * bulk ones may need a terminating short packet (zero length).
	 */
	if (urb->transfer_buffer_length != 0) {
		int one_more = 0;

		if (usb_pipecontrol(urb->pipe)) {
			one_more = 1;
1465 1466 1467 1468
			if (packet_type == IN_PID)
				packet_type = OUT_PID;
			else
				packet_type = IN_PID;
S
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1469 1470
		} else if (usb_pipebulk(urb->pipe)
				&& (urb->transfer_flags & URB_ZERO_PACKET)
1471 1472
				&& !(urb->transfer_buffer_length %
							maxpacketsize)) {
S
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1473 1474 1475
			one_more = 1;
		}
		if (one_more) {
1476
			qtd = qtd_alloc(flags, urb, packet_type);
S
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1477 1478 1479 1480
			if (!qtd)
				goto cleanup;

			/* never any data in such packets */
1481 1482
			qtd_fill(qtd, NULL, 0);
			list_add_tail(&qtd->qtd_list, head);
S
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1483 1484 1485
		}
	}

1486
	return;
S
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1487 1488

cleanup:
1489 1490 1491
	qtd_list_free(head);
}

S
Sebastian Siewior 已提交
1492 1493 1494
static int isp1760_urb_enqueue(struct usb_hcd *hcd, struct urb *urb,
		gfp_t mem_flags)
{
1495 1496 1497 1498 1499 1500 1501
	struct isp1760_hcd *priv = hcd_to_priv(hcd);
	struct list_head *ep_queue;
	struct isp1760_qh *qh, *qhit;
	unsigned long spinflags;
	LIST_HEAD(new_qtds);
	int retval;
	int qh_in_queue;
S
Sebastian Siewior 已提交
1502 1503 1504

	switch (usb_pipetype(urb->pipe)) {
	case PIPE_CONTROL:
1505
		ep_queue = &priv->qh_list[QH_CONTROL];
1506
		break;
S
Sebastian Siewior 已提交
1507
	case PIPE_BULK:
1508
		ep_queue = &priv->qh_list[QH_BULK];
S
Sebastian Siewior 已提交
1509 1510
		break;
	case PIPE_INTERRUPT:
1511 1512 1513
		if (urb->interval < 0)
			return -EINVAL;
		/* FIXME: Check bandwidth  */
1514
		ep_queue = &priv->qh_list[QH_INTERRUPT];
S
Sebastian Siewior 已提交
1515 1516
		break;
	case PIPE_ISOCHRONOUS:
1517 1518 1519 1520
		dev_err(hcd->self.controller, "%s: isochronous USB packets "
							"not yet supported\n",
							__func__);
		return -EPIPE;
S
Sebastian Siewior 已提交
1521
	default:
1522 1523
		dev_err(hcd->self.controller, "%s: unknown pipe type\n",
							__func__);
S
Sebastian Siewior 已提交
1524 1525 1526
		return -EPIPE;
	}

1527 1528
	if (usb_pipein(urb->pipe))
		urb->actual_length = 0;
S
Sebastian Siewior 已提交
1529

1530 1531 1532
	packetize_urb(hcd, urb, &new_qtds, mem_flags);
	if (list_empty(&new_qtds))
		return -ENOMEM;
S
Sebastian Siewior 已提交
1533

1534 1535
	retval = 0;
	spin_lock_irqsave(&priv->lock, spinflags);
S
Sebastian Siewior 已提交
1536

1537 1538
	if (!test_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags)) {
		retval = -ESHUTDOWN;
1539
		qtd_list_free(&new_qtds);
1540
		goto out;
S
Sebastian Siewior 已提交
1541
	}
1542
	retval = usb_hcd_link_urb_to_ep(hcd, urb);
1543 1544
	if (retval) {
		qtd_list_free(&new_qtds);
1545
		goto out;
1546
	}
S
Sebastian Siewior 已提交
1547

1548 1549 1550 1551 1552 1553
	qh = urb->ep->hcpriv;
	if (qh) {
		qh_in_queue = 0;
		list_for_each_entry(qhit, ep_queue, qh_list) {
			if (qhit == qh) {
				qh_in_queue = 1;
1554
				break;
1555 1556 1557 1558 1559 1560 1561 1562
			}
		}
		if (!qh_in_queue)
			list_add_tail(&qh->qh_list, ep_queue);
	} else {
		qh = qh_alloc(GFP_ATOMIC);
		if (!qh) {
			retval = -ENOMEM;
1563
			usb_hcd_unlink_urb_from_ep(hcd, urb);
1564
			qtd_list_free(&new_qtds);
1565
			goto out;
S
Sebastian Siewior 已提交
1566
		}
1567 1568
		list_add_tail(&qh->qh_list, ep_queue);
		urb->ep->hcpriv = qh;
S
Sebastian Siewior 已提交
1569 1570
	}

1571 1572 1573 1574 1575 1576
	list_splice_tail(&new_qtds, &qh->qtd_list);
	schedule_ptds(hcd);

out:
	spin_unlock_irqrestore(&priv->lock, spinflags);
	return retval;
S
Sebastian Siewior 已提交
1577 1578
}

1579 1580 1581 1582 1583 1584 1585 1586 1587 1588
static void kill_transfer(struct usb_hcd *hcd, struct urb *urb,
		struct isp1760_qh *qh)
{
	struct isp1760_hcd *priv = hcd_to_priv(hcd);
	int skip_map;

	WARN_ON(qh->slot == -1);

	/* We need to forcefully reclaim the slot since some transfers never
	   return, e.g. interrupt transfers and NAKed bulk transfers. */
1589
	if (usb_pipecontrol(urb->pipe) || usb_pipebulk(urb->pipe)) {
1590 1591 1592 1593 1594 1595 1596 1597 1598 1599 1600 1601 1602 1603 1604 1605
		skip_map = reg_read32(hcd->regs, HC_ATL_PTD_SKIPMAP_REG);
		skip_map |= (1 << qh->slot);
		reg_write32(hcd->regs, HC_ATL_PTD_SKIPMAP_REG, skip_map);
		priv->atl_slots[qh->slot].qh = NULL;
		priv->atl_slots[qh->slot].qtd = NULL;
	} else {
		skip_map = reg_read32(hcd->regs, HC_INT_PTD_SKIPMAP_REG);
		skip_map |= (1 << qh->slot);
		reg_write32(hcd->regs, HC_INT_PTD_SKIPMAP_REG, skip_map);
		priv->int_slots[qh->slot].qh = NULL;
		priv->int_slots[qh->slot].qtd = NULL;
	}

	qh->slot = -1;
}

1606 1607 1608 1609 1610 1611 1612 1613 1614 1615 1616 1617 1618 1619 1620 1621 1622 1623 1624 1625 1626 1627 1628 1629 1630 1631 1632 1633 1634 1635 1636 1637 1638 1639 1640
/*
 * Retire the qtds beginning at 'qtd' and belonging all to the same urb, killing
 * any active transfer belonging to the urb in the process.
 */
static void dequeue_urb_from_qtd(struct usb_hcd *hcd, struct isp1760_qh *qh,
						struct isp1760_qtd *qtd)
{
	struct urb *urb;
	int urb_was_running;

	urb = qtd->urb;
	urb_was_running = 0;
	list_for_each_entry_from(qtd, &qh->qtd_list, qtd_list) {
		if (qtd->urb != urb)
			break;

		if (qtd->status >= QTD_XFER_STARTED)
			urb_was_running = 1;
		if (last_qtd_of_urb(qtd, qh) &&
					(qtd->status >= QTD_XFER_COMPLETE))
			urb_was_running = 0;

		if (qtd->status == QTD_XFER_STARTED)
			kill_transfer(hcd, urb, qh);
		qtd->status = QTD_RETIRE;
	}

	if ((urb->dev->speed != USB_SPEED_HIGH) && urb_was_running) {
		qh->tt_buffer_dirty = 1;
		if (usb_hub_clear_tt_buffer(urb))
			/* Clear failed; let's hope things work anyway */
			qh->tt_buffer_dirty = 0;
	}
}

1641 1642
static int isp1760_urb_dequeue(struct usb_hcd *hcd, struct urb *urb,
		int status)
S
Sebastian Siewior 已提交
1643
{
1644
	struct isp1760_hcd *priv = hcd_to_priv(hcd);
1645
	unsigned long spinflags;
1646 1647 1648
	struct isp1760_qh *qh;
	struct isp1760_qtd *qtd;
	int retval = 0;
S
Sebastian Siewior 已提交
1649

1650
	spin_lock_irqsave(&priv->lock, spinflags);
1651 1652 1653
	retval = usb_hcd_check_unlink_urb(hcd, urb, status);
	if (retval)
		goto out;
S
Sebastian Siewior 已提交
1654

1655 1656 1657 1658 1659
	qh = urb->ep->hcpriv;
	if (!qh) {
		retval = -EINVAL;
		goto out;
	}
S
Sebastian Siewior 已提交
1660

1661 1662
	list_for_each_entry(qtd, &qh->qtd_list, qtd_list)
		if (qtd->urb == urb) {
1663
			dequeue_urb_from_qtd(hcd, qh, qtd);
1664
			list_move(&qtd->qtd_list, &qh->qtd_list);
1665
			break;
1666
		}
S
Sebastian Siewior 已提交
1667

1668 1669
	urb->status = status;
	schedule_ptds(hcd);
S
Sebastian Siewior 已提交
1670

1671 1672 1673
out:
	spin_unlock_irqrestore(&priv->lock, spinflags);
	return retval;
S
Sebastian Siewior 已提交
1674 1675
}

1676 1677 1678 1679
static void isp1760_endpoint_disable(struct usb_hcd *hcd,
		struct usb_host_endpoint *ep)
{
	struct isp1760_hcd *priv = hcd_to_priv(hcd);
1680
	unsigned long spinflags;
1681 1682
	struct isp1760_qh *qh, *qh_iter;
	int i;
1683 1684

	spin_lock_irqsave(&priv->lock, spinflags);
1685

1686 1687 1688 1689
	qh = ep->hcpriv;
	if (!qh)
		goto out;

1690
	WARN_ON(!list_empty(&qh->qtd_list));
1691

1692 1693 1694 1695 1696 1697 1698 1699
	for (i = 0; i < QH_END; i++)
		list_for_each_entry(qh_iter, &priv->qh_list[i], qh_list)
			if (qh_iter == qh) {
				list_del(&qh_iter->qh_list);
				i = QH_END;
				break;
			}
	qh_free(qh);
1700 1701
	ep->hcpriv = NULL;

1702 1703
	schedule_ptds(hcd);

1704 1705 1706 1707
out:
	spin_unlock_irqrestore(&priv->lock, spinflags);
}

S
Sebastian Siewior 已提交
1708 1709 1710 1711 1712 1713 1714 1715
static int isp1760_hub_status_data(struct usb_hcd *hcd, char *buf)
{
	struct isp1760_hcd *priv = hcd_to_priv(hcd);
	u32 temp, status = 0;
	u32 mask;
	int retval = 1;
	unsigned long flags;

1716
	/* if !PM, root hub timers won't get shut down ... */
S
Sebastian Siewior 已提交
1717 1718 1719 1720 1721 1722 1723 1724
	if (!HC_IS_RUNNING(hcd->state))
		return 0;

	/* init status to no-changes */
	buf[0] = 0;
	mask = PORT_CSC;

	spin_lock_irqsave(&priv->lock, flags);
1725
	temp = reg_read32(hcd->regs, HC_PORTSC1);
S
Sebastian Siewior 已提交
1726 1727 1728 1729

	if (temp & PORT_OWNER) {
		if (temp & PORT_CSC) {
			temp &= ~PORT_CSC;
1730
			reg_write32(hcd->regs, HC_PORTSC1, temp);
S
Sebastian Siewior 已提交
1731 1732 1733 1734 1735 1736
			goto done;
		}
	}

	/*
	 * Return status information even for ports with OWNER set.
1737
	 * Otherwise hub_wq wouldn't see the disconnect event when a
S
Sebastian Siewior 已提交
1738 1739 1740 1741 1742 1743 1744 1745 1746 1747 1748 1749 1750 1751 1752 1753 1754 1755 1756 1757 1758 1759 1760 1761 1762 1763 1764 1765 1766 1767 1768 1769
	 * high-speed device is switched over to the companion
	 * controller by the user.
	 */

	if ((temp & mask) != 0
			|| ((temp & PORT_RESUME) != 0
				&& time_after_eq(jiffies,
					priv->reset_done))) {
		buf [0] |= 1 << (0 + 1);
		status = STS_PCD;
	}
	/* FIXME autosuspend idle root hubs */
done:
	spin_unlock_irqrestore(&priv->lock, flags);
	return status ? retval : 0;
}

static void isp1760_hub_descriptor(struct isp1760_hcd *priv,
		struct usb_hub_descriptor *desc)
{
	int ports = HCS_N_PORTS(priv->hcs_params);
	u16 temp;

	desc->bDescriptorType = 0x29;
	/* priv 1.0, 2.3.9 says 20ms max */
	desc->bPwrOn2PwrGood = 10;
	desc->bHubContrCurrent = 0;

	desc->bNbrPorts = ports;
	temp = 1 + (ports / 8);
	desc->bDescLength = 7 + 2 * temp;

1770
	/* ports removable, and usb 1.0 legacy PortPwrCtrlMask */
J
John Youn 已提交
1771 1772
	memset(&desc->u.hs.DeviceRemovable[0], 0, temp);
	memset(&desc->u.hs.DeviceRemovable[temp], 0xff, temp);
S
Sebastian Siewior 已提交
1773 1774

	/* per-port overcurrent reporting */
S
Sergei Shtylyov 已提交
1775
	temp = HUB_CHAR_INDV_PORT_OCPM;
S
Sebastian Siewior 已提交
1776 1777
	if (HCS_PPC(priv->hcs_params))
		/* per-port power control */
S
Sergei Shtylyov 已提交
1778
		temp |= HUB_CHAR_INDV_PORT_LPSM;
S
Sebastian Siewior 已提交
1779 1780
	else
		/* no power switching */
S
Sergei Shtylyov 已提交
1781
		temp |= HUB_CHAR_NO_LPSM;
S
Sebastian Siewior 已提交
1782 1783 1784 1785 1786
	desc->wHubCharacteristics = cpu_to_le16(temp);
}

#define	PORT_WAKE_BITS	(PORT_WKOC_E|PORT_WKDISC_E|PORT_WKCONN_E)

1787 1788
static int check_reset_complete(struct usb_hcd *hcd, int index,
		int port_status)
S
Sebastian Siewior 已提交
1789 1790 1791 1792 1793 1794 1795
{
	if (!(port_status & PORT_CONNECT))
		return port_status;

	/* if reset finished and it's still not enabled -- handoff */
	if (!(port_status & PORT_PE)) {

1796
		dev_info(hcd->self.controller,
1797 1798
					"port %d full speed --> companion\n",
					index + 1);
S
Sebastian Siewior 已提交
1799 1800 1801

		port_status |= PORT_OWNER;
		port_status &= ~PORT_RWC_BITS;
1802
		reg_write32(hcd->regs, HC_PORTSC1, port_status);
S
Sebastian Siewior 已提交
1803 1804

	} else
1805
		dev_info(hcd->self.controller, "port %d high speed\n",
1806
								index + 1);
S
Sebastian Siewior 已提交
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

	return port_status;
}

static int isp1760_hub_control(struct usb_hcd *hcd, u16 typeReq,
		u16 wValue, u16 wIndex, char *buf, u16 wLength)
{
	struct isp1760_hcd *priv = hcd_to_priv(hcd);
	int ports = HCS_N_PORTS(priv->hcs_params);
	u32 temp, status;
	unsigned long flags;
	int retval = 0;
	unsigned selector;

	/*
	 * FIXME:  support SetPortFeatures USB_PORT_FEAT_INDICATOR.
	 * HCS_INDICATOR may say we can change LEDs to off/amber/green.
	 * (track current state ourselves) ... blink for diagnostics,
	 * power, "this is the one", etc.  EHCI spec supports this.
	 */

	spin_lock_irqsave(&priv->lock, flags);
	switch (typeReq) {
	case ClearHubFeature:
		switch (wValue) {
		case C_HUB_LOCAL_POWER:
		case C_HUB_OVER_CURRENT:
			/* no hub-wide feature/status flags */
			break;
		default:
			goto error;
		}
		break;
	case ClearPortFeature:
		if (!wIndex || wIndex > ports)
			goto error;
		wIndex--;
1844
		temp = reg_read32(hcd->regs, HC_PORTSC1);
S
Sebastian Siewior 已提交
1845 1846 1847

		/*
		 * Even if OWNER is set, so the port is owned by the
1848
		 * companion controller, hub_wq needs to be able to clear
S
Sebastian Siewior 已提交
1849
		 * the port-change status bits (especially
1850
		 * USB_PORT_STAT_C_CONNECTION).
S
Sebastian Siewior 已提交
1851 1852 1853 1854
		 */

		switch (wValue) {
		case USB_PORT_FEAT_ENABLE:
1855
			reg_write32(hcd->regs, HC_PORTSC1, temp & ~PORT_PE);
S
Sebastian Siewior 已提交
1856 1857 1858 1859 1860 1861 1862 1863 1864 1865 1866 1867 1868
			break;
		case USB_PORT_FEAT_C_ENABLE:
			/* XXX error? */
			break;
		case USB_PORT_FEAT_SUSPEND:
			if (temp & PORT_RESET)
				goto error;

			if (temp & PORT_SUSPEND) {
				if ((temp & PORT_PE) == 0)
					goto error;
				/* resume signaling for 20 msec */
				temp &= ~(PORT_RWC_BITS);
1869 1870
				reg_write32(hcd->regs, HC_PORTSC1,
							temp | PORT_RESUME);
S
Sebastian Siewior 已提交
1871
				priv->reset_done = jiffies +
1872
					msecs_to_jiffies(USB_RESUME_TIMEOUT);
S
Sebastian Siewior 已提交
1873 1874 1875 1876 1877 1878 1879
			}
			break;
		case USB_PORT_FEAT_C_SUSPEND:
			/* we auto-clear this feature */
			break;
		case USB_PORT_FEAT_POWER:
			if (HCS_PPC(priv->hcs_params))
1880 1881
				reg_write32(hcd->regs, HC_PORTSC1,
							temp & ~PORT_POWER);
S
Sebastian Siewior 已提交
1882 1883
			break;
		case USB_PORT_FEAT_C_CONNECTION:
1884
			reg_write32(hcd->regs, HC_PORTSC1, temp | PORT_CSC);
S
Sebastian Siewior 已提交
1885 1886 1887 1888 1889 1890 1891 1892 1893 1894
			break;
		case USB_PORT_FEAT_C_OVER_CURRENT:
			/* XXX error ?*/
			break;
		case USB_PORT_FEAT_C_RESET:
			/* GetPortStatus clears reset */
			break;
		default:
			goto error;
		}
1895
		reg_read32(hcd->regs, HC_USBCMD);
S
Sebastian Siewior 已提交
1896 1897 1898 1899 1900 1901 1902 1903 1904 1905 1906 1907 1908 1909
		break;
	case GetHubDescriptor:
		isp1760_hub_descriptor(priv, (struct usb_hub_descriptor *)
			buf);
		break;
	case GetHubStatus:
		/* no hub-wide feature/status flags */
		memset(buf, 0, 4);
		break;
	case GetPortStatus:
		if (!wIndex || wIndex > ports)
			goto error;
		wIndex--;
		status = 0;
1910
		temp = reg_read32(hcd->regs, HC_PORTSC1);
S
Sebastian Siewior 已提交
1911 1912 1913

		/* wPortChange bits */
		if (temp & PORT_CSC)
1914
			status |= USB_PORT_STAT_C_CONNECTION << 16;
S
Sebastian Siewior 已提交
1915 1916 1917 1918


		/* whoever resumes must GetPortStatus to complete it!! */
		if (temp & PORT_RESUME) {
1919
			dev_err(hcd->self.controller, "Port resume should be skipped.\n");
S
Sebastian Siewior 已提交
1920 1921 1922 1923 1924 1925 1926

			/* Remote Wakeup received? */
			if (!priv->reset_done) {
				/* resume signaling for 20 msec */
				priv->reset_done = jiffies
						+ msecs_to_jiffies(20);
				/* check the port again */
1927
				mod_timer(&hcd->rh_timer, priv->reset_done);
S
Sebastian Siewior 已提交
1928 1929 1930 1931 1932
			}

			/* resume completed? */
			else if (time_after_eq(jiffies,
					priv->reset_done)) {
1933
				status |= USB_PORT_STAT_C_SUSPEND << 16;
S
Sebastian Siewior 已提交
1934 1935 1936
				priv->reset_done = 0;

				/* stop resume signaling */
1937 1938 1939 1940
				temp = reg_read32(hcd->regs, HC_PORTSC1);
				reg_write32(hcd->regs, HC_PORTSC1,
					temp & ~(PORT_RWC_BITS | PORT_RESUME));
				retval = handshake(hcd, HC_PORTSC1,
S
Sebastian Siewior 已提交
1941 1942
					   PORT_RESUME, 0, 2000 /* 2msec */);
				if (retval != 0) {
1943
					dev_err(hcd->self.controller,
S
Sebastian Siewior 已提交
1944 1945 1946 1947 1948 1949 1950 1951 1952 1953 1954 1955
						"port %d resume error %d\n",
						wIndex + 1, retval);
					goto error;
				}
				temp &= ~(PORT_SUSPEND|PORT_RESUME|(3<<10));
			}
		}

		/* whoever resets must GetPortStatus to complete it!! */
		if ((temp & PORT_RESET)
				&& time_after_eq(jiffies,
					priv->reset_done)) {
1956
			status |= USB_PORT_STAT_C_RESET << 16;
S
Sebastian Siewior 已提交
1957 1958 1959
			priv->reset_done = 0;

			/* force reset to complete */
1960
			reg_write32(hcd->regs, HC_PORTSC1, temp & ~PORT_RESET);
S
Sebastian Siewior 已提交
1961 1962 1963
			/* REVISIT:  some hardware needs 550+ usec to clear
			 * this bit; seems too long to spin routinely...
			 */
1964
			retval = handshake(hcd, HC_PORTSC1,
S
Sebastian Siewior 已提交
1965 1966
					PORT_RESET, 0, 750);
			if (retval != 0) {
1967
				dev_err(hcd->self.controller, "port %d reset error %d\n",
S
Sebastian Siewior 已提交
1968 1969 1970 1971 1972
						wIndex + 1, retval);
				goto error;
			}

			/* see what we found out */
1973 1974
			temp = check_reset_complete(hcd, wIndex,
					reg_read32(hcd->regs, HC_PORTSC1));
S
Sebastian Siewior 已提交
1975 1976
		}
		/*
1977
		 * Even if OWNER is set, there's no harm letting hub_wq
S
Sebastian Siewior 已提交
1978 1979 1980 1981 1982
		 * see the wPortStatus values (they should all be 0 except
		 * for PORT_POWER anyway).
		 */

		if (temp & PORT_OWNER)
1983
			dev_err(hcd->self.controller, "PORT_OWNER is set\n");
S
Sebastian Siewior 已提交
1984 1985

		if (temp & PORT_CONNECT) {
1986
			status |= USB_PORT_STAT_CONNECTION;
S
Sebastian Siewior 已提交
1987
			/* status may be from integrated TT */
1988
			status |= USB_PORT_STAT_HIGH_SPEED;
S
Sebastian Siewior 已提交
1989 1990
		}
		if (temp & PORT_PE)
1991
			status |= USB_PORT_STAT_ENABLE;
S
Sebastian Siewior 已提交
1992
		if (temp & (PORT_SUSPEND|PORT_RESUME))
1993
			status |= USB_PORT_STAT_SUSPEND;
S
Sebastian Siewior 已提交
1994
		if (temp & PORT_RESET)
1995
			status |= USB_PORT_STAT_RESET;
S
Sebastian Siewior 已提交
1996
		if (temp & PORT_POWER)
1997
			status |= USB_PORT_STAT_POWER;
S
Sebastian Siewior 已提交
1998 1999 2000 2001 2002 2003 2004 2005 2006 2007 2008 2009 2010 2011 2012 2013 2014 2015 2016

		put_unaligned(cpu_to_le32(status), (__le32 *) buf);
		break;
	case SetHubFeature:
		switch (wValue) {
		case C_HUB_LOCAL_POWER:
		case C_HUB_OVER_CURRENT:
			/* no hub-wide feature/status flags */
			break;
		default:
			goto error;
		}
		break;
	case SetPortFeature:
		selector = wIndex >> 8;
		wIndex &= 0xff;
		if (!wIndex || wIndex > ports)
			goto error;
		wIndex--;
2017
		temp = reg_read32(hcd->regs, HC_PORTSC1);
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		if (temp & PORT_OWNER)
			break;

/*		temp &= ~PORT_RWC_BITS; */
		switch (wValue) {
		case USB_PORT_FEAT_ENABLE:
2024
			reg_write32(hcd->regs, HC_PORTSC1, temp | PORT_PE);
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			break;

		case USB_PORT_FEAT_SUSPEND:
			if ((temp & PORT_PE) == 0
					|| (temp & PORT_RESET) != 0)
				goto error;

2032
			reg_write32(hcd->regs, HC_PORTSC1, temp | PORT_SUSPEND);
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			break;
		case USB_PORT_FEAT_POWER:
			if (HCS_PPC(priv->hcs_params))
2036 2037
				reg_write32(hcd->regs, HC_PORTSC1,
							temp | PORT_POWER);
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2038 2039 2040 2041 2042 2043 2044 2045 2046 2047 2048 2049 2050 2051 2052 2053 2054 2055 2056 2057 2058 2059
			break;
		case USB_PORT_FEAT_RESET:
			if (temp & PORT_RESUME)
				goto error;
			/* line status bits may report this as low speed,
			 * which can be fine if this root hub has a
			 * transaction translator built in.
			 */
			if ((temp & (PORT_PE|PORT_CONNECT)) == PORT_CONNECT
					&& PORT_USB11(temp)) {
				temp |= PORT_OWNER;
			} else {
				temp |= PORT_RESET;
				temp &= ~PORT_PE;

				/*
				 * caller must wait, then call GetPortStatus
				 * usb 2.0 spec says 50 ms resets on root
				 */
				priv->reset_done = jiffies +
					msecs_to_jiffies(50);
			}
2060
			reg_write32(hcd->regs, HC_PORTSC1, temp);
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			break;
		default:
			goto error;
		}
2065
		reg_read32(hcd->regs, HC_USBCMD);
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		break;

	default:
error:
		/* "stall" on error */
		retval = -EPIPE;
	}
	spin_unlock_irqrestore(&priv->lock, flags);
	return retval;
}

static int isp1760_get_frame(struct usb_hcd *hcd)
{
	struct isp1760_hcd *priv = hcd_to_priv(hcd);
	u32 fr;

2082
	fr = reg_read32(hcd->regs, HC_FRINDEX);
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	return (fr >> 3) % priv->periodic_size;
}

static void isp1760_stop(struct usb_hcd *hcd)
{
	struct isp1760_hcd *priv = hcd_to_priv(hcd);
2089
	u32 temp;
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2091 2092
	del_timer(&errata2_timer);

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	isp1760_hub_control(hcd, ClearPortFeature, USB_PORT_FEAT_POWER,	1,
			NULL, 0);
	mdelay(20);

	spin_lock_irq(&priv->lock);
2098
	ehci_reset(hcd);
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	/* Disable IRQ */
2100 2101
	temp = reg_read32(hcd->regs, HC_HW_MODE_CTRL);
	reg_write32(hcd->regs, HC_HW_MODE_CTRL, temp &= ~HW_GLOBAL_INTR_EN);
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	spin_unlock_irq(&priv->lock);

2104
	reg_write32(hcd->regs, HC_CONFIGFLAG, 0);
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}

static void isp1760_shutdown(struct usb_hcd *hcd)
{
2109
	u32 command, temp;
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	isp1760_stop(hcd);
2112 2113
	temp = reg_read32(hcd->regs, HC_HW_MODE_CTRL);
	reg_write32(hcd->regs, HC_HW_MODE_CTRL, temp &= ~HW_GLOBAL_INTR_EN);
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2114

2115
	command = reg_read32(hcd->regs, HC_USBCMD);
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2116
	command &= ~CMD_RUN;
2117
	reg_write32(hcd->regs, HC_USBCMD, command);
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}

2120 2121 2122 2123 2124 2125 2126 2127 2128 2129 2130 2131 2132 2133 2134 2135 2136
static void isp1760_clear_tt_buffer_complete(struct usb_hcd *hcd,
						struct usb_host_endpoint *ep)
{
	struct isp1760_hcd *priv = hcd_to_priv(hcd);
	struct isp1760_qh *qh = ep->hcpriv;
	unsigned long spinflags;

	if (!qh)
		return;

	spin_lock_irqsave(&priv->lock, spinflags);
	qh->tt_buffer_dirty = 0;
	schedule_ptds(hcd);
	spin_unlock_irqrestore(&priv->lock, spinflags);
}


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static const struct hc_driver isp1760_hc_driver = {
	.description		= "isp1760-hcd",
	.product_desc		= "NXP ISP1760 USB Host Controller",
2140
	.hcd_priv_size		= sizeof(struct isp1760_hcd *),
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	.irq			= isp1760_irq,
	.flags			= HCD_MEMORY | HCD_USB2,
	.reset			= isp1760_hc_setup,
	.start			= isp1760_run,
	.stop			= isp1760_stop,
	.shutdown		= isp1760_shutdown,
	.urb_enqueue		= isp1760_urb_enqueue,
	.urb_dequeue		= isp1760_urb_dequeue,
	.endpoint_disable	= isp1760_endpoint_disable,
	.get_frame_number	= isp1760_get_frame,
	.hub_status_data	= isp1760_hub_status_data,
	.hub_control		= isp1760_hub_control,
2153
	.clear_tt_buffer_complete	= isp1760_clear_tt_buffer_complete,
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};

2156
int __init isp1760_init_kmem_once(void)
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{
2158
	urb_listitem_cachep = kmem_cache_create("isp1760_urb_listitem",
2159 2160 2161 2162 2163 2164
			sizeof(struct urb_listitem), 0, SLAB_TEMPORARY |
			SLAB_MEM_SPREAD, NULL);

	if (!urb_listitem_cachep)
		return -ENOMEM;

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	qtd_cachep = kmem_cache_create("isp1760_qtd",
			sizeof(struct isp1760_qtd), 0, SLAB_TEMPORARY |
			SLAB_MEM_SPREAD, NULL);

	if (!qtd_cachep)
		return -ENOMEM;

	qh_cachep = kmem_cache_create("isp1760_qh", sizeof(struct isp1760_qh),
			0, SLAB_TEMPORARY | SLAB_MEM_SPREAD, NULL);

	if (!qh_cachep) {
		kmem_cache_destroy(qtd_cachep);
		return -ENOMEM;
	}

	return 0;
}

2183
void isp1760_deinit_kmem_cache(void)
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{
	kmem_cache_destroy(qtd_cachep);
	kmem_cache_destroy(qh_cachep);
2187
	kmem_cache_destroy(urb_listitem_cachep);
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}

2190 2191
int isp1760_hcd_register(struct isp1760_hcd *priv, void __iomem *regs,
			 struct resource *mem, int irq, unsigned long irqflags,
2192
			 struct device *dev)
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{
	struct usb_hcd *hcd;
	int ret;

2197
	hcd = usb_create_hcd(&isp1760_hc_driver, dev, dev_name(dev));
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	if (!hcd)
2199
		return -ENOMEM;
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2201 2202
	*(struct isp1760_hcd **)hcd->hcd_priv = priv;

2203
	priv->hcd = hcd;
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	init_memory(priv);

	hcd->irq = irq;
2208
	hcd->regs = regs;
2209 2210
	hcd->rsrc_start = mem->start;
	hcd->rsrc_len = resource_size(mem);
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2212 2213 2214
	/* This driver doesn't support wakeup requests */
	hcd->cant_recv_wakeups = 1;

2215 2216
	ret = usb_add_hcd(hcd, irq, irqflags);
	if (ret)
2217
		goto error;
2218

2219
	device_wakeup_enable(hcd->self.controller);
2220

2221
	return 0;
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2223
error:
2224 2225
	usb_put_hcd(hcd);
	return ret;
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}

2228
void isp1760_hcd_unregister(struct isp1760_hcd *priv)
2229
{
2230 2231
	if (!priv->hcd)
		return;
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2233 2234
	usb_remove_hcd(priv->hcd);
	usb_put_hcd(priv->hcd);
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}