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	Version: linux-6.0.1 spark-3.0.0 hadoop-3.2.0-src hadoop-3.3.0-src spark-2.4.7 linux-4.15.13 hadoop-2.7.4-src Revert   Change

 // SPDX-License-Identifier: GPL-2.0
 /*
  * 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>
  *
  * (c) 2011 Arvid Brodin <arvid.brodin@enea.com>
  *
  * Copyright 2021 Linaro, Rui Miguel Silva <rui.silva@linaro.org>
  *
  */
 #include <linux/gpio/consumer.h>
 #include <linux/module.h>
 #include <linux/kernel.h>
 #include <linux/slab.h>
 #include <linux/list.h>
 #include <linux/usb.h>
 #include <linux/usb/hcd.h>
 #include <linux/debugfs.h>
 #include <linux/uaccess.h>
 #include <linux/io.h>
 #include <linux/iopoll.h>
 #include <linux/mm.h>
 #include <linux/timer.h>
 #include <asm/unaligned.h>
 #include <asm/cacheflush.h>
 
 #include "isp1760-core.h"
 #include "isp1760-hcd.h"
 #include "isp1760-regs.h"
 
 static struct kmem_cache *qtd_cachep;
 static struct kmem_cache *qh_cachep;
 static struct kmem_cache *urb_listitem_cachep;
 
 typedef void (packet_enqueue)(struct usb_hcd *hcd, struct isp1760_qh *qh,
         struct isp1760_qtd *qtd);
 
 static inline struct isp1760_hcd *hcd_to_priv(struct usb_hcd *hcd)
 {
     return *(struct isp1760_hcd **)hcd->hcd_priv;
 }
 
 #define dw_to_le32(x)   (cpu_to_le32((__force u32)x))
 #define le32_to_dw(x)   ((__force __dw)(le32_to_cpu(x)))
 
 /* 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;
 };
 
 struct ptd_le32 {
     __le32 dw0;
     __le32 dw1;
     __le32 dw2;
     __le32 dw3;
     __le32 dw4;
     __le32 dw5;
     __le32 dw6;
     __le32 dw7;
 };
 
 #define PTD_OFFSET      0x0400
 #define ISO_PTD_OFFSET      0x0400
 #define INT_PTD_OFFSET      0x0800
 #define ATL_PTD_OFFSET      0x0c00
 #define PAYLOAD_OFFSET      0x1000
 
 #define ISP_BANK_0      0x00
 #define ISP_BANK_1      0x01
 #define ISP_BANK_2      0x02
 #define ISP_BANK_3      0x03
 
 #define TO_DW(x)    ((__force __dw)x)
 #define TO_U32(x)   ((__force u32)x)
 
  /* ATL */
  /* DW0 */
 #define DW0_VALID_BIT           TO_DW(1)
 #define FROM_DW0_VALID(x)       (TO_U32(x) & 0x01)
 #define TO_DW0_LENGTH(x)        TO_DW((((u32)x) << 3))
 #define TO_DW0_MAXPACKET(x)     TO_DW((((u32)x) << 18))
 #define TO_DW0_MULTI(x)         TO_DW((((u32)x) << 29))
 #define TO_DW0_ENDPOINT(x)      TO_DW((((u32)x) << 31))
 /* DW1 */
 #define TO_DW1_DEVICE_ADDR(x)       TO_DW((((u32)x) << 3))
 #define TO_DW1_PID_TOKEN(x)     TO_DW((((u32)x) << 10))
 #define DW1_TRANS_BULK          TO_DW(((u32)2 << 12))
 #define DW1_TRANS_INT           TO_DW(((u32)3 << 12))
 #define DW1_TRANS_SPLIT         TO_DW(((u32)1 << 14))
 #define DW1_SE_USB_LOSPEED      TO_DW(((u32)2 << 16))
 #define TO_DW1_PORT_NUM(x)      TO_DW((((u32)x) << 18))
 #define TO_DW1_HUB_NUM(x)       TO_DW((((u32)x) << 25))
 /* DW2 */
 #define TO_DW2_DATA_START_ADDR(x)   TO_DW((((u32)x) << 8))
 #define TO_DW2_RL(x)            TO_DW(((x) << 25))
 #define FROM_DW2_RL(x)          ((TO_U32(x) >> 25) & 0xf)
 /* DW3 */
 #define FROM_DW3_NRBYTESTRANSFERRED(x)      TO_U32((x) & 0x3fff)
 #define FROM_DW3_SCS_NRBYTESTRANSFERRED(x)  TO_U32((x) & 0x07ff)
 #define TO_DW3_NAKCOUNT(x)      TO_DW(((x) << 19))
 #define FROM_DW3_NAKCOUNT(x)        ((TO_U32(x) >> 19) & 0xf)
 #define TO_DW3_CERR(x)          TO_DW(((x) << 23))
 #define FROM_DW3_CERR(x)        ((TO_U32(x) >> 23) & 0x3)
 #define TO_DW3_DATA_TOGGLE(x)       TO_DW(((x) << 25))
 #define FROM_DW3_DATA_TOGGLE(x)     ((TO_U32(x) >> 25) & 0x1)
 #define TO_DW3_PING(x)          TO_DW(((x) << 26))
 #define FROM_DW3_PING(x)        ((TO_U32(x) >> 26) & 0x1)
 #define DW3_ERROR_BIT           TO_DW((1 << 28))
 #define DW3_BABBLE_BIT          TO_DW((1 << 29))
 #define DW3_HALT_BIT            TO_DW((1 << 30))
 #define DW3_ACTIVE_BIT          TO_DW((1 << 31))
 #define FROM_DW3_ACTIVE(x)      ((TO_U32(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 (3)
 
 struct isp1760_qtd {
     u8 packet_type;
     void *data_buffer;
     u32 payload_addr;
 
     /* the rest is HCD-private */
     struct list_head qtd_list;
     struct urb *urb;
     size_t length;
     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
     u32 status;
 };
 
 /* Queue head, one for each active endpoint */
 struct isp1760_qh {
     struct list_head qh_list;
     struct list_head qtd_list;
     u32 toggle;
     u32 ping;
     int slot;
     int tt_buffer_dirty;    /* See USB2.0 spec section 11.17.5 */
 };
 
 struct urb_listitem {
     struct list_head urb_list;
     struct urb *urb;
 };
 
 static const u32 isp176x_hc_portsc1_fields[] = {
     [PORT_OWNER]        = BIT(13),
     [PORT_POWER]        = BIT(12),
     [PORT_LSTATUS]      = BIT(10),
     [PORT_RESET]        = BIT(8),
     [PORT_SUSPEND]      = BIT(7),
     [PORT_RESUME]       = BIT(6),
     [PORT_PE]       = BIT(2),
     [PORT_CSC]      = BIT(1),
     [PORT_CONNECT]      = BIT(0),
 };
 
 /*
  * Access functions for isp176x registers regmap fields
  */
 static u32 isp1760_hcd_read(struct usb_hcd *hcd, u32 field)
 {
     struct isp1760_hcd *priv = hcd_to_priv(hcd);
 
     return isp1760_field_read(priv->fields, field);
 }
 
 /*
  * We need, in isp176x, to write directly the values to the portsc1
  * register so it will make the other values to trigger.
  */
 static void isp1760_hcd_portsc1_set_clear(struct isp1760_hcd *priv, u32 field,
                       u32 val)
 {
     u32 bit = isp176x_hc_portsc1_fields[field];
     u16 portsc1_reg = priv->is_isp1763 ? ISP1763_HC_PORTSC1 :
         ISP176x_HC_PORTSC1;
     u32 port_status = readl(priv->base + portsc1_reg);
 
     if (val)
         writel(port_status | bit, priv->base + portsc1_reg);
     else
         writel(port_status & ~bit, priv->base + portsc1_reg);
 }
 
 static void isp1760_hcd_write(struct usb_hcd *hcd, u32 field, u32 val)
 {
     struct isp1760_hcd *priv = hcd_to_priv(hcd);
 
     if (unlikely((field >= PORT_OWNER && field <= PORT_CONNECT)))
         return isp1760_hcd_portsc1_set_clear(priv, field, val);
 
     isp1760_field_write(priv->fields, field, val);
 }
 
 static void isp1760_hcd_set(struct usb_hcd *hcd, u32 field)
 {
     isp1760_hcd_write(hcd, field, 0xFFFFFFFF);
 }
 
 static void isp1760_hcd_clear(struct usb_hcd *hcd, u32 field)
 {
     isp1760_hcd_write(hcd, field, 0);
 }
 
 static int isp1760_hcd_set_and_wait(struct usb_hcd *hcd, u32 field,
                     u32 timeout_us)
 {
     struct isp1760_hcd *priv = hcd_to_priv(hcd);
     u32 val;
 
     isp1760_hcd_set(hcd, field);
 
     return regmap_field_read_poll_timeout(priv->fields[field], val,
                           val, 0, timeout_us);
 }
 
 static int isp1760_hcd_set_and_wait_swap(struct usb_hcd *hcd, u32 field,
                      u32 timeout_us)
 {
     struct isp1760_hcd *priv = hcd_to_priv(hcd);
     u32 val;
 
     isp1760_hcd_set(hcd, field);
 
     return regmap_field_read_poll_timeout(priv->fields[field], val,
                           !val, 0, timeout_us);
 }
 
 static int isp1760_hcd_clear_and_wait(struct usb_hcd *hcd, u32 field,
                       u32 timeout_us)
 {
     struct isp1760_hcd *priv = hcd_to_priv(hcd);
     u32 val;
 
     isp1760_hcd_clear(hcd, field);
 
     return regmap_field_read_poll_timeout(priv->fields[field], val,
                           !val, 0, timeout_us);
 }
 
 static bool isp1760_hcd_is_set(struct usb_hcd *hcd, u32 field)
 {
     return !!isp1760_hcd_read(hcd, field);
 }
 
 static bool isp1760_hcd_ppc_is_set(struct usb_hcd *hcd)
 {
     struct isp1760_hcd *priv = hcd_to_priv(hcd);
 
     if (priv->is_isp1763)
         return true;
 
     return isp1760_hcd_is_set(hcd, HCS_PPC);
 }
 
 static u32 isp1760_hcd_n_ports(struct usb_hcd *hcd)
 {
     struct isp1760_hcd *priv = hcd_to_priv(hcd);
 
     if (priv->is_isp1763)
         return 1;
 
     return isp1760_hcd_read(hcd, HCS_N_PORTS);
 }
 
 /*
  * 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_read() 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()
  * doesn't quite work because some people have to enforce 32-bit access
  */
 static void bank_reads8(void __iomem *src_base, u32 src_offset, u32 bank_addr,
                             __u32 *dst, u32 bytes)
 {
     __u32 __iomem *src;
     u32 val;
     __u8 *src_byteptr;
     __u8 *dst_byteptr;
 
     src = src_base + (bank_addr | src_offset);
 
     if (src_offset < PAYLOAD_OFFSET) {
         while (bytes >= 4) {
             *dst = readl_relaxed(src);
             bytes -= 4;
             src++;
             dst++;
         }
     } else {
         while (bytes >= 4) {
             *dst = __raw_readl(src);
             bytes -= 4;
             src++;
             dst++;
         }
     }
 
     if (!bytes)
         return;
 
     /* in case we have 3, 2 or 1 by left. The dst buffer may not be fully
      * allocated.
      */
     if (src_offset < PAYLOAD_OFFSET)
         val = readl_relaxed(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--;
     }
 }
 
 static void isp1760_mem_read(struct usb_hcd *hcd, u32 src_offset, void *dst,
                  u32 bytes)
 {
     struct isp1760_hcd *priv = hcd_to_priv(hcd);
 
     isp1760_reg_write(priv->regs, ISP176x_HC_MEMORY, src_offset);
     ndelay(100);
 
     bank_reads8(priv->base, src_offset, ISP_BANK_0, dst, bytes);
 }
 
 /*
  * ISP1763 does not have the banks direct host controller memory access,
  * needs to use the HC_DATA register. Add data read/write according to this,
  * and also adjust 16bit access.
  */
 static void isp1763_mem_read(struct usb_hcd *hcd, u16 srcaddr,
                  u16 *dstptr, u32 bytes)
 {
     struct isp1760_hcd *priv = hcd_to_priv(hcd);
 
     /* Write the starting device address to the hcd memory register */
     isp1760_reg_write(priv->regs, ISP1763_HC_MEMORY, srcaddr);
     ndelay(100); /* Delay between consecutive access */
 
     /* As long there are at least 16-bit to read ... */
     while (bytes >= 2) {
         *dstptr = __raw_readw(priv->base + ISP1763_HC_DATA);
         bytes -= 2;
         dstptr++;
     }
 
     /* If there are no more bytes to read, return */
     if (bytes <= 0)
         return;
 
     *((u8 *)dstptr) = (u8)(readw(priv->base + ISP1763_HC_DATA) & 0xFF);
 }
 
 static void mem_read(struct usb_hcd *hcd, u32 src_offset, __u32 *dst,
              u32 bytes)
 {
     struct isp1760_hcd *priv = hcd_to_priv(hcd);
 
     if (!priv->is_isp1763)
         return isp1760_mem_read(hcd, src_offset, (u16 *)dst, bytes);
 
     isp1763_mem_read(hcd, (u16)src_offset, (u16 *)dst, bytes);
 }
 
 static void isp1760_mem_write(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) {
             writel_relaxed(*src, dst);
             bytes -= 4;
             src++;
             dst++;
         }
     } else {
         while (bytes >= 4) {
             __raw_writel(*src, dst);
             bytes -= 4;
             src++;
             dst++;
         }
     }
 
     if (!bytes)
         return;
     /* 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.
      */
 
     if (dst_offset < PAYLOAD_OFFSET)
         writel_relaxed(*src, dst);
     else
         __raw_writel(*src, dst);
 }
 
 static void isp1763_mem_write(struct usb_hcd *hcd, u16 dstaddr, u16 *src,
                   u32 bytes)
 {
     struct isp1760_hcd *priv = hcd_to_priv(hcd);
 
     /* Write the starting device address to the hcd memory register */
     isp1760_reg_write(priv->regs, ISP1763_HC_MEMORY, dstaddr);
     ndelay(100); /* Delay between consecutive access */
 
     while (bytes >= 2) {
         /* Get and write the data; then adjust the data ptr and len */
         __raw_writew(*src, priv->base + ISP1763_HC_DATA);
         bytes -= 2;
         src++;
     }
 
     /* If there are no more bytes to process, return */
     if (bytes <= 0)
         return;
 
     /*
      * The only way to get here is if there is a single byte left,
      * get it and write it to the data reg;
      */
     writew(*((u8 *)src), priv->base + ISP1763_HC_DATA);
 }
 
 static void mem_write(struct usb_hcd *hcd, u32 dst_offset, __u32 *src,
               u32 bytes)
 {
     struct isp1760_hcd *priv = hcd_to_priv(hcd);
 
     if (!priv->is_isp1763)
         return isp1760_mem_write(priv->base, dst_offset, src, bytes);
 
     isp1763_mem_write(hcd, dst_offset, (u16 *)src, bytes);
 }
 
 /*
  * 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 isp1760_ptd_read(struct usb_hcd *hcd, u32 ptd_offset, u32 slot,
                  struct ptd *ptd)
 {
     u16 src_offset = ptd_offset + slot * sizeof(*ptd);
     struct isp1760_hcd *priv = hcd_to_priv(hcd);
 
     isp1760_reg_write(priv->regs, ISP176x_HC_MEMORY, src_offset);
     ndelay(90);
 
     bank_reads8(priv->base, src_offset, ISP_BANK_0, (void *)ptd,
             sizeof(*ptd));
 }
 
 static void isp1763_ptd_read(struct usb_hcd *hcd, u32 ptd_offset, u32 slot,
                  struct ptd *ptd)
 {
     u16 src_offset = ptd_offset + slot * sizeof(*ptd);
     struct ptd_le32 le32_ptd;
 
     isp1763_mem_read(hcd, src_offset, (u16 *)&le32_ptd, sizeof(le32_ptd));
     /* Normalize the data obtained */
     ptd->dw0 = le32_to_dw(le32_ptd.dw0);
     ptd->dw1 = le32_to_dw(le32_ptd.dw1);
     ptd->dw2 = le32_to_dw(le32_ptd.dw2);
     ptd->dw3 = le32_to_dw(le32_ptd.dw3);
     ptd->dw4 = le32_to_dw(le32_ptd.dw4);
     ptd->dw5 = le32_to_dw(le32_ptd.dw5);
     ptd->dw6 = le32_to_dw(le32_ptd.dw6);
     ptd->dw7 = le32_to_dw(le32_ptd.dw7);
 }
 
 static void ptd_read(struct usb_hcd *hcd, u32 ptd_offset, u32 slot,
              struct ptd *ptd)
 {
     struct isp1760_hcd *priv = hcd_to_priv(hcd);
 
     if (!priv->is_isp1763)
         return isp1760_ptd_read(hcd, ptd_offset, slot, ptd);
 
     isp1763_ptd_read(hcd, ptd_offset, slot, ptd);
 }
 
 static void isp1763_ptd_write(struct usb_hcd *hcd, u32 ptd_offset, u32 slot,
                   struct ptd *cpu_ptd)
 {
     u16 dst_offset = ptd_offset + slot * sizeof(*cpu_ptd);
     struct ptd_le32 ptd;
 
     ptd.dw0 = dw_to_le32(cpu_ptd->dw0);
     ptd.dw1 = dw_to_le32(cpu_ptd->dw1);
     ptd.dw2 = dw_to_le32(cpu_ptd->dw2);
     ptd.dw3 = dw_to_le32(cpu_ptd->dw3);
     ptd.dw4 = dw_to_le32(cpu_ptd->dw4);
     ptd.dw5 = dw_to_le32(cpu_ptd->dw5);
     ptd.dw6 = dw_to_le32(cpu_ptd->dw6);
     ptd.dw7 = dw_to_le32(cpu_ptd->dw7);
 
     isp1763_mem_write(hcd, dst_offset,  (u16 *)&ptd.dw0,
               8 * sizeof(ptd.dw0));
 }
 
 static void isp1760_ptd_write(void __iomem *base, u32 ptd_offset, u32 slot,
                   struct ptd *ptd)
 {
     u32 dst_offset = ptd_offset + slot * sizeof(*ptd);
 
     /*
      * Make sure dw0 gets written last (after other dw's and after payload)
      *  since it contains the enable bit
      */
     isp1760_mem_write(base, dst_offset + sizeof(ptd->dw0),
               (__force u32 *)&ptd->dw1, 7 * sizeof(ptd->dw1));
     wmb();
     isp1760_mem_write(base, dst_offset, (__force u32 *)&ptd->dw0,
               sizeof(ptd->dw0));
 }
 
 static void ptd_write(struct usb_hcd *hcd, u32 ptd_offset, u32 slot,
               struct ptd *ptd)
 {
     struct isp1760_hcd *priv = hcd_to_priv(hcd);
 
     if (!priv->is_isp1763)
         return isp1760_ptd_write(priv->base, ptd_offset, slot, ptd);
 
     isp1763_ptd_write(hcd, ptd_offset, slot, ptd);
 }
 
 /* memory management of the 60kb on the chip from 0x1000 to 0xffff */
 static void init_memory(struct isp1760_hcd *priv)
 {
     const struct isp1760_memory_layout *mem = priv->memory_layout;
     int i, j, curr;
     u32 payload_addr;
 
     payload_addr = PAYLOAD_OFFSET;
 
     for (i = 0, curr = 0; i < ARRAY_SIZE(mem->blocks); i++, curr += j) {
         for (j = 0; j < mem->blocks[i]; j++) {
             priv->memory_pool[curr + j].start = payload_addr;
             priv->memory_pool[curr + j].size = mem->blocks_size[i];
             priv->memory_pool[curr + j].free = 1;
             payload_addr += priv->memory_pool[curr + j].size;
         }
     }
 
     WARN_ON(payload_addr - priv->memory_pool[0].start >
         mem->payload_area_size);
 }
 
 static void alloc_mem(struct usb_hcd *hcd, struct isp1760_qtd *qtd)
 {
     struct isp1760_hcd *priv = hcd_to_priv(hcd);
     const struct isp1760_memory_layout *mem = priv->memory_layout;
     int i;
 
     WARN_ON(qtd->payload_addr);
 
     if (!qtd->length)
         return;
 
     for (i = 0; i < mem->payload_blocks; i++) {
         if (priv->memory_pool[i].size >= qtd->length &&
                 priv->memory_pool[i].free) {
             priv->memory_pool[i].free = 0;
             qtd->payload_addr = priv->memory_pool[i].start;
             return;
         }
     }
 }
 
 static void free_mem(struct usb_hcd *hcd, struct isp1760_qtd *qtd)
 {
     struct isp1760_hcd *priv = hcd_to_priv(hcd);
     const struct isp1760_memory_layout *mem = priv->memory_layout;
     int i;
 
     if (!qtd->payload_addr)
         return;
 
     for (i = 0; i < mem->payload_blocks; i++) {
         if (priv->memory_pool[i].start == qtd->payload_addr) {
             WARN_ON(priv->memory_pool[i].free);
             priv->memory_pool[i].free = 1;
             qtd->payload_addr = 0;
             return;
         }
     }
 
     dev_err(hcd->self.controller, "%s: Invalid pointer: %08x\n",
                         __func__, qtd->payload_addr);
     WARN_ON(1);
     qtd->payload_addr = 0;
 }
 
 /* reset a non-running (STS_HALT == 1) controller */
 static int ehci_reset(struct usb_hcd *hcd)
 {
     struct isp1760_hcd *priv = hcd_to_priv(hcd);
 
     hcd->state = HC_STATE_HALT;
     priv->next_statechange = jiffies;
 
     return isp1760_hcd_set_and_wait_swap(hcd, CMD_RESET, 250 * 1000);
 }
 
 static struct isp1760_qh *qh_alloc(gfp_t flags)
 {
     struct isp1760_qh *qh;
 
     qh = kmem_cache_zalloc(qh_cachep, flags);
     if (!qh)
         return NULL;
 
     INIT_LIST_HEAD(&qh->qh_list);
     INIT_LIST_HEAD(&qh->qtd_list);
     qh->slot = -1;
 
     return qh;
 }
 
 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);
 }
 
 /* one-time init, only for memory state */
 static int priv_init(struct usb_hcd *hcd)
 {
     struct isp1760_hcd *priv = hcd_to_priv(hcd);
     u32 isoc_cache;
     u32 isoc_thres;
     int i;
 
     spin_lock_init(&priv->lock);
 
     for (i = 0; i < QH_END; i++)
         INIT_LIST_HEAD(&priv->qh_list[i]);
 
     /*
      * 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;
 
     if (priv->is_isp1763) {
         priv->i_thresh = 2;
         return 0;
     }
 
     /* controllers may cache some of the periodic schedule ... */
     isoc_cache = isp1760_hcd_read(hcd, HCC_ISOC_CACHE);
     isoc_thres = isp1760_hcd_read(hcd, HCC_ISOC_THRES);
 
     /* full frame cache */
     if (isoc_cache)
         priv->i_thresh = 8;
     else /* N microframes cached */
         priv->i_thresh = 2 + isoc_thres;
 
     return 0;
 }
 
 static int isp1760_hc_setup(struct usb_hcd *hcd)
 {
     struct isp1760_hcd *priv = hcd_to_priv(hcd);
     u32 atx_reset;
     int result;
     u32 scratch;
     u32 pattern;
 
     if (priv->is_isp1763)
         pattern = 0xcafe;
     else
         pattern = 0xdeadcafe;
 
     isp1760_hcd_write(hcd, HC_SCRATCH, pattern);
 
     /*
      * we do not care about the read value here we just want to
      * change bus pattern.
      */
     isp1760_hcd_read(hcd, HC_CHIP_ID_HIGH);
     scratch = isp1760_hcd_read(hcd, HC_SCRATCH);
     if (scratch != pattern) {
         dev_err(hcd->self.controller, "Scratch test failed. 0x%08x\n",
             scratch);
         return -ENODEV;
     }
 
     /*
      * 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.
      */
     isp1760_hcd_clear(hcd, ISO_BUF_FILL);
     isp1760_hcd_clear(hcd, INT_BUF_FILL);
     isp1760_hcd_clear(hcd, ATL_BUF_FILL);
 
     isp1760_hcd_set(hcd, HC_ATL_PTD_SKIPMAP);
     isp1760_hcd_set(hcd, HC_INT_PTD_SKIPMAP);
     isp1760_hcd_set(hcd, HC_ISO_PTD_SKIPMAP);
 
     result = ehci_reset(hcd);
     if (result)
         return result;
 
     /* Step 11 passed */
 
     /* ATL reset */
     if (priv->is_isp1763)
         atx_reset = SW_RESET_RESET_ATX;
     else
         atx_reset = ALL_ATX_RESET;
 
     isp1760_hcd_set(hcd, atx_reset);
     mdelay(10);
     isp1760_hcd_clear(hcd, atx_reset);
 
     if (priv->is_isp1763) {
         isp1760_hcd_set(hcd, HW_OTG_DISABLE);
         isp1760_hcd_set(hcd, HW_SW_SEL_HC_DC_CLEAR);
         isp1760_hcd_set(hcd, HW_HC_2_DIS_CLEAR);
         mdelay(10);
 
         isp1760_hcd_set(hcd, HW_INTF_LOCK);
     }
 
     isp1760_hcd_set(hcd, HC_INT_IRQ_ENABLE);
     isp1760_hcd_set(hcd, HC_ATL_IRQ_ENABLE);
 
     return priv_init(hcd);
 }
 
 static u32 base_to_chip(u32 base)
 {
     return ((base - 0x400) >> 3);
 }
 
 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);
 }
 
 /* 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,
             struct isp1760_qtd *qtd, struct ptd *ptd)
 {
     u32 maxpacket;
     u32 multi;
     u32 rl = RL_COUNTER;
     u32 nak = NAK_COUNTER;
 
     memset(ptd, 0, sizeof(*ptd));
 
     /* according to 3.6.2, max packet len can not be > 0x400 */
     maxpacket = usb_maxpacket(qtd->urb->dev, qtd->urb->pipe);
     multi =  1 + ((maxpacket >> 11) & 0x3);
     maxpacket &= 0x7ff;
 
     /* DW0 */
     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));
 
     /* DW1 */
     ptd->dw1 = TO_DW((usb_pipeendpoint(qtd->urb->pipe) >> 1));
     ptd->dw1 |= TO_DW1_DEVICE_ADDR(usb_pipedevice(qtd->urb->pipe));
     ptd->dw1 |= TO_DW1_PID_TOKEN(qtd->packet_type);
 
     if (usb_pipebulk(qtd->urb->pipe))
         ptd->dw1 |= DW1_TRANS_BULK;
     else if  (usb_pipeint(qtd->urb->pipe))
         ptd->dw1 |= DW1_TRANS_INT;
 
     if (qtd->urb->dev->speed != USB_SPEED_HIGH) {
         /* split transaction */
 
         ptd->dw1 |= DW1_TRANS_SPLIT;
         if (qtd->urb->dev->speed == USB_SPEED_LOW)
             ptd->dw1 |= DW1_SE_USB_LOSPEED;
 
         ptd->dw1 |= TO_DW1_PORT_NUM(qtd->urb->dev->ttport);
         ptd->dw1 |= TO_DW1_HUB_NUM(qtd->urb->dev->tt->hub->devnum);
 
         /* SE bit for Split INT transfers */
         if (usb_pipeint(qtd->urb->pipe) &&
                 (qtd->urb->dev->speed == USB_SPEED_LOW))
             ptd->dw1 |= DW1_SE_USB_LOSPEED;
 
         rl = 0;
         nak = 0;
     } else {
         ptd->dw0 |= TO_DW0_MULTI(multi);
         if (usb_pipecontrol(qtd->urb->pipe) ||
                         usb_pipebulk(qtd->urb->pipe))
             ptd->dw3 |= TO_DW3_PING(qh->ping);
     }
     /* DW2 */
     ptd->dw2 = 0;
     ptd->dw2 |= TO_DW2_DATA_START_ADDR(base_to_chip(qtd->payload_addr));
     ptd->dw2 |= TO_DW2_RL(rl);
 
     /* DW3 */
     ptd->dw3 |= TO_DW3_NAKCOUNT(nak);
     ptd->dw3 |= TO_DW3_DATA_TOGGLE(qh->toggle);
     if (usb_pipecontrol(qtd->urb->pipe)) {
         if (qtd->data_buffer == qtd->urb->setup_packet)
             ptd->dw3 &= ~TO_DW3_DATA_TOGGLE(1);
         else if (last_qtd_of_urb(qtd, qh))
             ptd->dw3 |= TO_DW3_DATA_TOGGLE(1);
     }
 
     ptd->dw3 |= DW3_ACTIVE_BIT;
     /* Cerr */
     ptd->dw3 |= TO_DW3_CERR(ERR_COUNTER);
 }
 
 static void transform_add_int(struct isp1760_qh *qh,
             struct isp1760_qtd *qtd, struct ptd *ptd)
 {
     u32 usof;
     u32 period;
 
     /*
      * 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...).
      */
 
     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 */
         else
             usof = 0xff; /* All bits set => interval 1/8 ms */
     } else {
         /* 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 = TO_DW(0xff); /* Execute Complete Split on any uFrame */
     }
 
     period = period >> 1;/* Ensure equal or shorter period than requested */
     period &= 0xf8; /* Mask off too large values and lowest unused 3 bits */
 
     ptd->dw2 |= TO_DW(period);
     ptd->dw4 = TO_DW(usof);
 }
 
 static void create_ptd_int(struct isp1760_qh *qh,
             struct isp1760_qtd *qtd, struct ptd *ptd)
 {
     create_ptd_atl(qh, qtd, ptd);
     transform_add_int(qh, qtd, ptd);
 }
 
 static void isp1760_urb_done(struct usb_hcd *hcd, struct urb *urb)
 __releases(priv->lock)
 __acquires(priv->lock)
 {
     struct isp1760_hcd *priv = hcd_to_priv(hcd);
 
     if (!urb->unlinked) {
         if (urb->status == -EINPROGRESS)
             urb->status = 0;
     }
 
     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));
     }
 
     /* complete() can reenter this HCD */
     usb_hcd_unlink_urb_from_ep(hcd, urb);
     spin_unlock(&priv->lock);
     usb_hcd_giveback_urb(hcd, urb, urb->status);
     spin_lock(&priv->lock);
 }
 
 static struct isp1760_qtd *qtd_alloc(gfp_t flags, struct urb *urb,
                                 u8 packet_type)
 {
     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;
     qtd->status = QTD_ENQUEUED;
     qtd->actual_length = 0;
 
     return qtd;
 }
 
 static void qtd_free(struct isp1760_qtd *qtd)
 {
     WARN_ON(qtd->payload_addr);
     kmem_cache_free(qtd_cachep, qtd);
 }
 
 static void start_bus_transfer(struct usb_hcd *hcd, u32 ptd_offset, int slot,
                 struct isp1760_slotinfo *slots,
                 struct isp1760_qtd *qtd, struct isp1760_qh *qh,
                 struct ptd *ptd)
 {
     struct isp1760_hcd *priv = hcd_to_priv(hcd);
     const struct isp1760_memory_layout *mem = priv->memory_layout;
     int skip_map;
 
     WARN_ON((slot < 0) || (slot > mem->slot_num - 1));
     WARN_ON(qtd->length && !qtd->payload_addr);
     WARN_ON(slots[slot].qtd);
     WARN_ON(slots[slot].qh);
     WARN_ON(qtd->status != QTD_PAYLOAD_ALLOC);
 
     if (priv->is_isp1763)
         ndelay(100);
 
     /* Make sure done map has not triggered from some unlinked transfer */
     if (ptd_offset == ATL_PTD_OFFSET) {
         skip_map = isp1760_hcd_read(hcd, HC_ATL_PTD_SKIPMAP);
         isp1760_hcd_write(hcd, HC_ATL_PTD_SKIPMAP,
                   skip_map | (1 << slot));
         priv->atl_done_map |= isp1760_hcd_read(hcd, HC_ATL_PTD_DONEMAP);
         priv->atl_done_map &= ~(1 << slot);
     } else {
         skip_map = isp1760_hcd_read(hcd, HC_INT_PTD_SKIPMAP);
         isp1760_hcd_write(hcd, HC_INT_PTD_SKIPMAP,
                   skip_map | (1 << slot));
         priv->int_done_map |= isp1760_hcd_read(hcd, HC_INT_PTD_DONEMAP);
         priv->int_done_map &= ~(1 << slot);
     }
 
     skip_map &= ~(1 << slot);
     qh->slot = slot;
     qtd->status = QTD_XFER_STARTED;
     slots[slot].timestamp = jiffies;
     slots[slot].qtd = qtd;
     slots[slot].qh = qh;
     ptd_write(hcd, ptd_offset, slot, ptd);
 
     if (ptd_offset == ATL_PTD_OFFSET)
         isp1760_hcd_write(hcd, HC_ATL_PTD_SKIPMAP, skip_map);
     else
         isp1760_hcd_write(hcd, HC_INT_PTD_SKIPMAP, skip_map);
 }
 
 static int is_short_bulk(struct isp1760_qtd *qtd)
 {
     return (usb_pipebulk(qtd->urb->pipe) &&
                     (qtd->actual_length < qtd->length));
 }
 
 static void collect_qtds(struct usb_hcd *hcd, struct isp1760_qh *qh,
                         struct list_head *urb_list)
 {
     struct isp1760_qtd *qtd, *qtd_next;
     struct urb_listitem *urb_listitem;
     int last_qtd;
 
     list_for_each_entry_safe(qtd, qtd_next, &qh->qtd_list, qtd_list) {
         if (qtd->status < QTD_XFER_COMPLETE)
             break;
 
         last_qtd = last_qtd_of_urb(qtd, qh);
 
         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_read(hcd, qtd->payload_addr,
                          qtd->data_buffer,
                          qtd->actual_length);
                     fallthrough;
                 case OUT_PID:
                     qtd->urb->actual_length +=
                             qtd->actual_length;
                     fallthrough;
                 case SETUP_PID:
                     break;
                 }
             }
 
             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;
             }
         }
 
         if (qtd->payload_addr)
             free_mem(hcd, qtd);
 
         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))
                 break; /* Try again on next call */
             urb_listitem->urb = qtd->urb;
             list_add_tail(&urb_listitem->urb_list, urb_list);
         }
 
         list_del(&qtd->qtd_list);
         qtd_free(qtd);
     }
 }
 
 #define ENQUEUE_DEPTH   2
 static void enqueue_qtds(struct usb_hcd *hcd, struct isp1760_qh *qh)
 {
     struct isp1760_hcd *priv = hcd_to_priv(hcd);
     const struct isp1760_memory_layout *mem = priv->memory_layout;
     int slot_num = mem->slot_num;
     int ptd_offset;
     struct isp1760_slotinfo *slots;
     int curr_slot, free_slot;
     int n;
     struct ptd ptd;
     struct isp1760_qtd *qtd;
 
     if (unlikely(list_empty(&qh->qtd_list))) {
         WARN_ON(1);
         return;
     }
 
     /* Make sure this endpoint's TT buffer is clean before queueing ptds */
     if (qh->tt_buffer_dirty)
         return;
 
     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;
     }
 
     free_slot = -1;
     for (curr_slot = 0; curr_slot < slot_num; curr_slot++) {
         if ((free_slot == -1) && (slots[curr_slot].qtd == NULL))
             free_slot = curr_slot;
         if (slots[curr_slot].qh == qh)
             break;
     }
 
     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;
 
             if (qtd->length && (qtd->packet_type == SETUP_PID ||
                         qtd->packet_type == OUT_PID)) {
                 mem_write(hcd, qtd->payload_addr,
                       qtd->data_buffer, qtd->length);
             }
 
             qtd->status = QTD_PAYLOAD_ALLOC;
         }
 
         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 > slot_num - 1) && (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;
             }
 
             n++;
             if (n >= ENQUEUE_DEPTH)
                 break;
         }
     }
 }
 
 static void schedule_ptds(struct usb_hcd *hcd)
 {
     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;
     int i;
 
     if (!hcd) {
         WARN_ON(1);
         return;
     }
 
     priv = hcd_to_priv(hcd);
 
     /*
      * check finished/retired xfers, transfer payloads, call urb_done()
      */
     for (i = 0; i < QH_END; i++) {
         ep_queue = &priv->qh_list[i];
         list_for_each_entry_safe(qh, qh_next, ep_queue, qh_list) {
             collect_qtds(hcd, qh, &urb_list);
             if (list_empty(&qh->qtd_list))
                 list_del(&qh->qh_list);
         }
     }
 
     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);
     }
 
     /*
      * 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!
      */
     for (i = 0; i < QH_END; i++) {
         ep_queue = &priv->qh_list[i];
         list_for_each_entry_safe(qh, qh_next, ep_queue, qh_list)
             enqueue_qtds(hcd, qh);
     }
 }
 
 #define PTD_STATE_QTD_DONE  1
 #define PTD_STATE_QTD_RELOAD    2
 #define PTD_STATE_URB_RETIRE    3
 
 static int check_int_transfer(struct usb_hcd *hcd, struct ptd *ptd,
                                 struct urb *urb)
 {
     u32 dw4;
     int i;
 
     dw4 = TO_U32(ptd->dw4);
     dw4 >>= 8;
 
     /* FIXME: ISP1761 datasheet does not say what to do with these. Do we
        need to handle these errors? Is it done in hardware? */
 
     if (ptd->dw3 & DW3_HALT_BIT) {
 
         urb->status = -EPROTO; /* Default unknown error */
 
         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;
         }
 
         return PTD_STATE_URB_RETIRE;
     }
 
     return PTD_STATE_QTD_DONE;
 }
 
 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
             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;
     }
 
     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;
     }
 
     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;
     }
 
     return PTD_STATE_QTD_DONE;
 }
 
 static void handle_done_ptds(struct usb_hcd *hcd)
 {
     struct isp1760_hcd *priv = hcd_to_priv(hcd);
     struct ptd ptd;
     struct isp1760_qh *qh;
     int slot;
     int state;
     struct isp1760_slotinfo *slots;
     u32 ptd_offset;
     struct isp1760_qtd *qtd;
     int modified;
     int skip_map;
 
     skip_map = isp1760_hcd_read(hcd, HC_INT_PTD_SKIPMAP);
     priv->int_done_map &= ~skip_map;
     skip_map = isp1760_hcd_read(hcd, HC_ATL_PTD_SKIPMAP);
     priv->atl_done_map &= ~skip_map;
 
     modified = priv->int_done_map || priv->atl_done_map;
 
     while (priv->int_done_map || priv->atl_done_map) {
         if (priv->int_done_map) {
             /* INT ptd */
             slot = __ffs(priv->int_done_map);
             priv->int_done_map &= ~(1 << slot);
             slots = priv->int_slots;
             /* This should not trigger, and could be removed if
                noone have any problems with it triggering: */
             if (!slots[slot].qh) {
                 WARN_ON(1);
                 continue;
             }
             ptd_offset = INT_PTD_OFFSET;
             ptd_read(hcd, INT_PTD_OFFSET, slot, &ptd);
             state = check_int_transfer(hcd, &ptd,
                             slots[slot].qtd->urb);
         } else {
             /* ATL ptd */
             slot = __ffs(priv->atl_done_map);
             priv->atl_done_map &= ~(1 << slot);
             slots = priv->atl_slots;
             /* This should not trigger, and could be removed if
                noone have any problems with it triggering: */
             if (!slots[slot].qh) {
                 WARN_ON(1);
                 continue;
             }
             ptd_offset = ATL_PTD_OFFSET;
             ptd_read(hcd, ATL_PTD_OFFSET, slot, &ptd);
             state = check_atl_transfer(hcd, &ptd,
                             slots[slot].qtd->urb);
         }
 
         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);
 
             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);
 
             qh->toggle = FROM_DW3_DATA_TOGGLE(ptd.dw3);
             qh->ping = FROM_DW3_PING(ptd.dw3);
             break;
 
         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;
 
         case PTD_STATE_URB_RETIRE:
             qtd->status = QTD_RETIRE;
             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;
             }
             qtd = NULL;
             qh->toggle = 0;
             qh->ping = 0;
             break;
 
         default:
             WARN_ON(1);
             continue;
         }
 
         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);
             }
 
             start_bus_transfer(hcd, ptd_offset, slot, slots, qtd,
                 qh, &ptd);
         }
     }
 
     if (modified)
         schedule_ptds(hcd);
 }
 
 static irqreturn_t isp1760_irq(struct usb_hcd *hcd)
 {
     struct isp1760_hcd *priv = hcd_to_priv(hcd);
     irqreturn_t irqret = IRQ_NONE;
     u32 int_reg;
     u32 imask;
 
     spin_lock(&priv->lock);
 
     if (!(hcd->state & HC_STATE_RUNNING))
         goto leave;
 
     imask = isp1760_hcd_read(hcd, HC_INTERRUPT);
     if (unlikely(!imask))
         goto leave;
 
     int_reg = priv->is_isp1763 ? ISP1763_HC_INTERRUPT :
         ISP176x_HC_INTERRUPT;
     isp1760_reg_write(priv->regs, int_reg, imask);
 
     priv->int_done_map |= isp1760_hcd_read(hcd, HC_INT_PTD_DONEMAP);
     priv->atl_done_map |= isp1760_hcd_read(hcd, HC_ATL_PTD_DONEMAP);
 
     handle_done_ptds(hcd);
 
     irqret = IRQ_HANDLED;
 
 leave:
     spin_unlock(&priv->lock);
 
     return irqret;
 }
 
 /*
  * 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.
  */
 #define SLOT_TIMEOUT 300
 #define SLOT_CHECK_PERIOD 200
 static struct timer_list errata2_timer;
 static struct usb_hcd *errata2_timer_hcd;
 
 static void errata2_function(struct timer_list *unused)
 {
     struct usb_hcd *hcd = errata2_timer_hcd;
     struct isp1760_hcd *priv = hcd_to_priv(hcd);
     const struct isp1760_memory_layout *mem = priv->memory_layout;
     int slot;
     struct ptd ptd;
     unsigned long spinflags;
 
     spin_lock_irqsave(&priv->lock, spinflags);
 
     for (slot = 0; slot < mem->slot_num; slot++)
         if (priv->atl_slots[slot].qh && time_after(jiffies,
                     priv->atl_slots[slot].timestamp +
                     msecs_to_jiffies(SLOT_TIMEOUT))) {
             ptd_read(hcd, ATL_PTD_OFFSET, slot, &ptd);
             if (!FROM_DW0_VALID(ptd.dw0) &&
                     !FROM_DW3_ACTIVE(ptd.dw3))
                 priv->atl_done_map |= 1 << slot;
         }
 
     if (priv->atl_done_map)
         handle_done_ptds(hcd);
 
     spin_unlock_irqrestore(&priv->lock, spinflags);
 
     errata2_timer.expires = jiffies + msecs_to_jiffies(SLOT_CHECK_PERIOD);
     add_timer(&errata2_timer);
 }
 
 static int isp1763_run(struct usb_hcd *hcd)
 {
     struct isp1760_hcd *priv = hcd_to_priv(hcd);
     int retval;
     u32 chipid_h;
     u32 chipid_l;
     u32 chip_rev;
     u32 ptd_atl_int;
     u32 ptd_iso;
 
     hcd->uses_new_polling = 1;
     hcd->state = HC_STATE_RUNNING;
 
     chipid_h = isp1760_hcd_read(hcd, HC_CHIP_ID_HIGH);
     chipid_l = isp1760_hcd_read(hcd, HC_CHIP_ID_LOW);
     chip_rev = isp1760_hcd_read(hcd, HC_CHIP_REV);
     dev_info(hcd->self.controller, "USB ISP %02x%02x HW rev. %d started\n",
          chipid_h, chipid_l, chip_rev);
 
     isp1760_hcd_clear(hcd, ISO_BUF_FILL);
     isp1760_hcd_clear(hcd, INT_BUF_FILL);
     isp1760_hcd_clear(hcd, ATL_BUF_FILL);
 
     isp1760_hcd_set(hcd, HC_ATL_PTD_SKIPMAP);
     isp1760_hcd_set(hcd, HC_INT_PTD_SKIPMAP);
     isp1760_hcd_set(hcd, HC_ISO_PTD_SKIPMAP);
     ndelay(100);
     isp1760_hcd_clear(hcd, HC_ATL_PTD_DONEMAP);
     isp1760_hcd_clear(hcd, HC_INT_PTD_DONEMAP);
     isp1760_hcd_clear(hcd, HC_ISO_PTD_DONEMAP);
 
     isp1760_hcd_set(hcd, HW_OTG_DISABLE);
     isp1760_reg_write(priv->regs, ISP1763_HC_OTG_CTRL_CLEAR, BIT(7));
     isp1760_reg_write(priv->regs, ISP1763_HC_OTG_CTRL_CLEAR, BIT(15));
     mdelay(10);
 
     isp1760_hcd_set(hcd, HC_INT_IRQ_ENABLE);
     isp1760_hcd_set(hcd, HC_ATL_IRQ_ENABLE);
 
     isp1760_hcd_set(hcd, HW_GLOBAL_INTR_EN);
 
     isp1760_hcd_clear(hcd, HC_ATL_IRQ_MASK_AND);
     isp1760_hcd_clear(hcd, HC_INT_IRQ_MASK_AND);
     isp1760_hcd_clear(hcd, HC_ISO_IRQ_MASK_AND);
 
     isp1760_hcd_set(hcd, HC_ATL_IRQ_MASK_OR);
     isp1760_hcd_set(hcd, HC_INT_IRQ_MASK_OR);
     isp1760_hcd_set(hcd, HC_ISO_IRQ_MASK_OR);
 
     ptd_atl_int = 0x8000;
     ptd_iso = 0x0001;
 
     isp1760_hcd_write(hcd, HC_ATL_PTD_LASTPTD, ptd_atl_int);
     isp1760_hcd_write(hcd, HC_INT_PTD_LASTPTD, ptd_atl_int);
     isp1760_hcd_write(hcd, HC_ISO_PTD_LASTPTD, ptd_iso);
 
     isp1760_hcd_set(hcd, ATL_BUF_FILL);
     isp1760_hcd_set(hcd, INT_BUF_FILL);
 
     isp1760_hcd_clear(hcd, CMD_LRESET);
     isp1760_hcd_clear(hcd, CMD_RESET);
 
     retval = isp1760_hcd_set_and_wait(hcd, CMD_RUN, 250 * 1000);
     if (retval)
         return retval;
 
     down_write(&ehci_cf_port_reset_rwsem);
     retval = isp1760_hcd_set_and_wait(hcd, FLAG_CF, 250 * 1000);
     up_write(&ehci_cf_port_reset_rwsem);
     if (retval)
         return retval;
 
     return 0;
 }
 
 static int isp1760_run(struct usb_hcd *hcd)
 {
     struct isp1760_hcd *priv = hcd_to_priv(hcd);
     int retval;
     u32 chipid_h;
     u32 chipid_l;
     u32 chip_rev;
     u32 ptd_atl_int;
     u32 ptd_iso;
 
     /*
      * ISP1763 have some differences in the setup and order to enable
      * the ports, disable otg, setup buffers, and ATL, INT, ISO status.
      * So, just handle it a separate sequence.
      */
     if (priv->is_isp1763)
         return isp1763_run(hcd);
 
     hcd->uses_new_polling = 1;
 
     hcd->state = HC_STATE_RUNNING;
 
     /* Set PTD interrupt AND & OR maps */
     isp1760_hcd_clear(hcd, HC_ATL_IRQ_MASK_AND);
     isp1760_hcd_clear(hcd, HC_INT_IRQ_MASK_AND);
     isp1760_hcd_clear(hcd, HC_ISO_IRQ_MASK_AND);
 
     isp1760_hcd_set(hcd, HC_ATL_IRQ_MASK_OR);
     isp1760_hcd_set(hcd, HC_INT_IRQ_MASK_OR);
     isp1760_hcd_set(hcd, HC_ISO_IRQ_MASK_OR);
 
     /* step 23 passed */
 
     isp1760_hcd_set(hcd, HW_GLOBAL_INTR_EN);
 
     isp1760_hcd_clear(hcd, CMD_LRESET);
     isp1760_hcd_clear(hcd, CMD_RESET);
 
     retval = isp1760_hcd_set_and_wait(hcd, 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);
 
     retval = isp1760_hcd_set_and_wait(hcd, FLAG_CF, 250 * 1000);
     up_write(&ehci_cf_port_reset_rwsem);
     if (retval)
         return retval;
 
     errata2_timer_hcd = hcd;
     timer_setup(&errata2_timer, errata2_function, 0);
     errata2_timer.expires = jiffies + msecs_to_jiffies(SLOT_CHECK_PERIOD);
     add_timer(&errata2_timer);
 
     chipid_h = isp1760_hcd_read(hcd, HC_CHIP_ID_HIGH);
     chipid_l = isp1760_hcd_read(hcd, HC_CHIP_ID_LOW);
     chip_rev = isp1760_hcd_read(hcd, HC_CHIP_REV);
     dev_info(hcd->self.controller, "USB ISP %02x%02x HW rev. %d started\n",
          chipid_h, chipid_l, chip_rev);
 
     /* PTD Register Init Part 2, Step 28 */
 
     /* Setup registers controlling PTD checking */
     ptd_atl_int = 0x80000000;
     ptd_iso = 0x00000001;
 
     isp1760_hcd_write(hcd, HC_ATL_PTD_LASTPTD, ptd_atl_int);
     isp1760_hcd_write(hcd, HC_INT_PTD_LASTPTD, ptd_atl_int);
     isp1760_hcd_write(hcd, HC_ISO_PTD_LASTPTD, ptd_iso);
 
     isp1760_hcd_set(hcd, HC_ATL_PTD_SKIPMAP);
     isp1760_hcd_set(hcd, HC_INT_PTD_SKIPMAP);
     isp1760_hcd_set(hcd, HC_ISO_PTD_SKIPMAP);
 
     isp1760_hcd_set(hcd, ATL_BUF_FILL);
     isp1760_hcd_set(hcd, 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;
 }
 
 static int qtd_fill(struct isp1760_qtd *qtd, void *databuffer, size_t len)
 {
     qtd->data_buffer = databuffer;
 
     qtd->length = len;
 
     return qtd->length;
 }
 
 static void qtd_list_free(struct list_head *qtd_list)
 {
     struct isp1760_qtd *qtd, *qtd_next;
 
     list_for_each_entry_safe(qtd, qtd_next, qtd_list, qtd_list) {
         list_del(&qtd->qtd_list);
         qtd_free(qtd);
     }
 }
 
 /*
  * Packetize urb->transfer_buffer into list of packets of size wMaxPacketSize.
  * Also calculate the PID type (SETUP/IN/OUT) for each packet.
  */
 static void packetize_urb(struct usb_hcd *hcd,
         struct urb *urb, struct list_head *head, gfp_t flags)
 {
     struct isp1760_hcd *priv = hcd_to_priv(hcd);
     const struct isp1760_memory_layout *mem = priv->memory_layout;
     struct isp1760_qtd *qtd;
     void *buf;
     int len, maxpacketsize;
     u8 packet_type;
 
     /*
      * URBs map to sequences of QTDs:  one logical transaction
      */
 
     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);
     }
 
     if (usb_pipein(urb->pipe))
         packet_type = IN_PID;
     else
         packet_type = OUT_PID;
 
     if (usb_pipecontrol(urb->pipe)) {
         qtd = qtd_alloc(flags, urb, SETUP_PID);
         if (!qtd)
             goto cleanup;
         qtd_fill(qtd, urb->setup_packet, sizeof(struct usb_ctrlrequest));
         list_add_tail(&qtd->qtd_list, head);
 
         /* for zero length DATA stages, STATUS is always IN */
         if (urb->transfer_buffer_length == 0)
             packet_type = IN_PID;
     }
 
     maxpacketsize = usb_maxpacket(urb->dev, urb->pipe);
 
     /*
      * buffer gets wrapped in one or more qtds;
      * last one may be "short" (including zero len)
      * and may serve as a control status ack
      */
     buf = urb->transfer_buffer;
     len = urb->transfer_buffer_length;
 
     for (;;) {
         int this_qtd_len;
 
         qtd = qtd_alloc(flags, urb, packet_type);
         if (!qtd)
             goto cleanup;
 
         if (len > mem->blocks_size[ISP176x_BLOCK_NUM - 1])
             this_qtd_len = mem->blocks_size[ISP176x_BLOCK_NUM - 1];
         else
             this_qtd_len = len;
 
         this_qtd_len = qtd_fill(qtd, buf, this_qtd_len);
         list_add_tail(&qtd->qtd_list, head);
 
         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;
             if (packet_type == IN_PID)
                 packet_type = OUT_PID;
             else
                 packet_type = IN_PID;
         } else if (usb_pipebulk(urb->pipe) && maxpacketsize
                 && (urb->transfer_flags & URB_ZERO_PACKET)
                 && !(urb->transfer_buffer_length %
                             maxpacketsize)) {
             one_more = 1;
         }
         if (one_more) {
             qtd = qtd_alloc(flags, urb, packet_type);
             if (!qtd)
                 goto cleanup;
 
             /* never any data in such packets */
             qtd_fill(qtd, NULL, 0);
             list_add_tail(&qtd->qtd_list, head);
         }
     }
 
     return;
 
 cleanup:
     qtd_list_free(head);
 }
 
 static int isp1760_urb_enqueue(struct usb_hcd *hcd, struct urb *urb,
         gfp_t mem_flags)
 {
     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;
 
     switch (usb_pipetype(urb->pipe)) {
     case PIPE_CONTROL:
         ep_queue = &priv->qh_list[QH_CONTROL];
         break;
     case PIPE_BULK:
         ep_queue = &priv->qh_list[QH_BULK];
         break;
     case PIPE_INTERRUPT:
         if (urb->interval < 0)
             return -EINVAL;
         /* FIXME: Check bandwidth  */
         ep_queue = &priv->qh_list[QH_INTERRUPT];
         break;
     case PIPE_ISOCHRONOUS:
         dev_err(hcd->self.controller, "%s: isochronous USB packets "
                             "not yet supported\n",
                             __func__);
         return -EPIPE;
     default:
         dev_err(hcd->self.controller, "%s: unknown pipe type\n",
                             __func__);
         return -EPIPE;
     }
 
     if (usb_pipein(urb->pipe))
         urb->actual_length = 0;
 
     packetize_urb(hcd, urb, &new_qtds, mem_flags);
     if (list_empty(&new_qtds))
         return -ENOMEM;
 
     spin_lock_irqsave(&priv->lock, spinflags);
 
     if (!test_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags)) {
         retval = -ESHUTDOWN;
         qtd_list_free(&new_qtds);
         goto out;
     }
     retval = usb_hcd_link_urb_to_ep(hcd, urb);
     if (retval) {
         qtd_list_free(&new_qtds);
         goto out;
     }
 
     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;
                 break;
             }
         }
         if (!qh_in_queue)
             list_add_tail(&qh->qh_list, ep_queue);
     } else {
         qh = qh_alloc(GFP_ATOMIC);
         if (!qh) {
             retval = -ENOMEM;
             usb_hcd_unlink_urb_from_ep(hcd, urb);
             qtd_list_free(&new_qtds);
             goto out;
         }
         list_add_tail(&qh->qh_list, ep_queue);
         urb->ep->hcpriv = qh;
     }
 
     list_splice_tail(&new_qtds, &qh->qtd_list);
     schedule_ptds(hcd);
 
 out:
     spin_unlock_irqrestore(&priv->lock, spinflags);
     return retval;
 }
 
 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. */
     if (usb_pipecontrol(urb->pipe) || usb_pipebulk(urb->pipe)) {
         if (qh->slot != -1) {
             skip_map = isp1760_hcd_read(hcd, HC_ATL_PTD_SKIPMAP);
             skip_map |= (1 << qh->slot);
             isp1760_hcd_write(hcd, HC_ATL_PTD_SKIPMAP, skip_map);
             ndelay(100);
         }
         priv->atl_slots[qh->slot].qh = NULL;
         priv->atl_slots[qh->slot].qtd = NULL;
     } else {
         if (qh->slot != -1) {
             skip_map = isp1760_hcd_read(hcd, HC_INT_PTD_SKIPMAP);
             skip_map |= (1 << qh->slot);
             isp1760_hcd_write(hcd, HC_INT_PTD_SKIPMAP, skip_map);
         }
         priv->int_slots[qh->slot].qh = NULL;
         priv->int_slots[qh->slot].qtd = NULL;
     }
 
     qh->slot = -1;
 }
 
 /*
  * 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;
     }
 }
 
 static int isp1760_urb_dequeue(struct usb_hcd *hcd, struct urb *urb,
         int status)
 {
     struct isp1760_hcd *priv = hcd_to_priv(hcd);
     unsigned long spinflags;
     struct isp1760_qh *qh;
     struct isp1760_qtd *qtd;
     int retval = 0;
 
     spin_lock_irqsave(&priv->lock, spinflags);
     retval = usb_hcd_check_unlink_urb(hcd, urb, status);
     if (retval)
         goto out;
 
     qh = urb->ep->hcpriv;
     if (!qh) {
         retval = -EINVAL;
         goto out;
     }
 
     list_for_each_entry(qtd, &qh->qtd_list, qtd_list)
         if (qtd->urb == urb) {
             dequeue_urb_from_qtd(hcd, qh, qtd);
             list_move(&qtd->qtd_list, &qh->qtd_list);
             break;
         }
 
     urb->status = status;
     schedule_ptds(hcd);
 
 out:
     spin_unlock_irqrestore(&priv->lock, spinflags);
     return retval;
 }
 
 static void isp1760_endpoint_disable(struct usb_hcd *hcd,
         struct usb_host_endpoint *ep)
 {
     struct isp1760_hcd *priv = hcd_to_priv(hcd);
     unsigned long spinflags;
     struct isp1760_qh *qh, *qh_iter;
     int i;
 
     spin_lock_irqsave(&priv->lock, spinflags);
 
     qh = ep->hcpriv;
     if (!qh)
         goto out;
 
     WARN_ON(!list_empty(&qh->qtd_list));
 
     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);
     ep->hcpriv = NULL;
 
     schedule_ptds(hcd);
 
 out:
     spin_unlock_irqrestore(&priv->lock, spinflags);
 }
 
 static int isp1760_hub_status_data(struct usb_hcd *hcd, char *buf)
 {
     struct isp1760_hcd *priv = hcd_to_priv(hcd);
     u32 status = 0;
     int retval = 1;
     unsigned long flags;
 
     /* if !PM, root hub timers won't get shut down ... */
     if (!HC_IS_RUNNING(hcd->state))
         return 0;
 
     /* init status to no-changes */
     buf[0] = 0;
 
     spin_lock_irqsave(&priv->lock, flags);
 
     if (isp1760_hcd_is_set(hcd, PORT_OWNER) &&
         isp1760_hcd_is_set(hcd, PORT_CSC)) {
         isp1760_hcd_clear(hcd, PORT_CSC);
         goto done;
     }
 
     /*
      * Return status information even for ports with OWNER set.
      * Otherwise hub_wq wouldn't see the disconnect event when a
      * high-speed device is switched over to the companion
      * controller by the user.
      */
     if (isp1760_hcd_is_set(hcd, PORT_CSC) ||
         (isp1760_hcd_is_set(hcd, PORT_RESUME) &&
          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;
     u16 temp;
 
     ports = isp1760_hcd_n_ports(priv->hcd);
 
     desc->bDescriptorType = USB_DT_HUB;
     /* 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;
 
     /* ports removable, and usb 1.0 legacy PortPwrCtrlMask */
     memset(&desc->u.hs.DeviceRemovable[0], 0, temp);
     memset(&desc->u.hs.DeviceRemovable[temp], 0xff, temp);
 
     /* per-port overcurrent reporting */
     temp = HUB_CHAR_INDV_PORT_OCPM;
     if (isp1760_hcd_ppc_is_set(priv->hcd))
         /* per-port power control */
         temp |= HUB_CHAR_INDV_PORT_LPSM;
     else
         /* no power switching */
         temp |= HUB_CHAR_NO_LPSM;
     desc->wHubCharacteristics = cpu_to_le16(temp);
 }
 
 #define PORT_WAKE_BITS  (PORT_WKOC_E|PORT_WKDISC_E|PORT_WKCONN_E)
 
 static void check_reset_complete(struct usb_hcd *hcd, int index)
 {
     if (!(isp1760_hcd_is_set(hcd, PORT_CONNECT)))
         return;
 
     /* if reset finished and it's still not enabled -- handoff */
     if (!isp1760_hcd_is_set(hcd, PORT_PE)) {
         dev_info(hcd->self.controller,
              "port %d full speed --> companion\n", index + 1);
 
         isp1760_hcd_set(hcd, PORT_OWNER);
 
         isp1760_hcd_clear(hcd, PORT_CSC);
     } else {
         dev_info(hcd->self.controller, "port %d high speed\n",
              index + 1);
     }
 
     return;
 }
 
 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);
     u32 status;
     unsigned long flags;
     int retval = 0;
     int ports;
 
     ports = isp1760_hcd_n_ports(hcd);
 
     /*
      * 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--;
 
         /*
          * Even if OWNER is set, so the port is owned by the
          * companion controller, hub_wq needs to be able to clear
          * the port-change status bits (especially
          * USB_PORT_STAT_C_CONNECTION).
          */
 
         switch (wValue) {
         case USB_PORT_FEAT_ENABLE:
             isp1760_hcd_clear(hcd, PORT_PE);
             break;
         case USB_PORT_FEAT_C_ENABLE:
             /* XXX error? */
             break;
         case USB_PORT_FEAT_SUSPEND:
             if (isp1760_hcd_is_set(hcd, PORT_RESET))
                 goto error;
 
             if (isp1760_hcd_is_set(hcd, PORT_SUSPEND)) {
                 if (!isp1760_hcd_is_set(hcd, PORT_PE))
                     goto error;
                 /* resume signaling for 20 msec */
                 isp1760_hcd_clear(hcd, PORT_CSC);
                 isp1760_hcd_set(hcd, PORT_RESUME);
 
                 priv->reset_done = jiffies +
                     msecs_to_jiffies(USB_RESUME_TIMEOUT);
             }
             break;
         case USB_PORT_FEAT_C_SUSPEND:
             /* we auto-clear this feature */
             break;
         case USB_PORT_FEAT_POWER:
             if (isp1760_hcd_ppc_is_set(hcd))
                 isp1760_hcd_clear(hcd, PORT_POWER);
             break;
         case USB_PORT_FEAT_C_CONNECTION:
             isp1760_hcd_set(hcd, PORT_CSC);
             break;
         case USB_PORT_FEAT_C_OVER_CURRENT:
             /* XXX error ?*/
             break;
         case USB_PORT_FEAT_C_RESET:
             /* GetPortStatus clears reset */
             break;
         default:
             goto error;
         }
         isp1760_hcd_read(hcd, CMD_RUN);
         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;
 
         /* wPortChange bits */
         if (isp1760_hcd_is_set(hcd, PORT_CSC))
             status |= USB_PORT_STAT_C_CONNECTION << 16;
 
         /* whoever resumes must GetPortStatus to complete it!! */
         if (isp1760_hcd_is_set(hcd, PORT_RESUME)) {
             dev_err(hcd->self.controller, "Port resume should be skipped.\n");
 
             /* Remote Wakeup received? */
             if (!priv->reset_done) {
                 /* resume signaling for 20 msec */
                 priv->reset_done = jiffies
                         + msecs_to_jiffies(20);
                 /* check the port again */
                 mod_timer(&hcd->rh_timer, priv->reset_done);
             }
 
             /* resume completed? */
             else if (time_after_eq(jiffies,
                     priv->reset_done)) {
                 status |= USB_PORT_STAT_C_SUSPEND << 16;
                 priv->reset_done = 0;
 
                 /* stop resume signaling */
                 isp1760_hcd_clear(hcd, PORT_CSC);
 
                 retval = isp1760_hcd_clear_and_wait(hcd,
                               PORT_RESUME, 2000);
                 if (retval != 0) {
                     dev_err(hcd->self.controller,
                         "port %d resume error %d\n",
                         wIndex + 1, retval);
                     goto error;
                 }
             }
         }
 
         /* whoever resets must GetPortStatus to complete it!! */
         if (isp1760_hcd_is_set(hcd, PORT_RESET) &&
             time_after_eq(jiffies, priv->reset_done)) {
             status |= USB_PORT_STAT_C_RESET << 16;
             priv->reset_done = 0;
 
             /* force reset to complete */
             /* REVISIT:  some hardware needs 550+ usec to clear
              * this bit; seems too long to spin routinely...
              */
             retval = isp1760_hcd_clear_and_wait(hcd, PORT_RESET,
                                 750);
             if (retval != 0) {
                 dev_err(hcd->self.controller, "port %d reset error %d\n",
                     wIndex + 1, retval);
                 goto error;
             }
 
             /* see what we found out */
             check_reset_complete(hcd, wIndex);
         }
         /*
          * Even if OWNER is set, there's no harm letting hub_wq
          * see the wPortStatus values (they should all be 0 except
          * for PORT_POWER anyway).
          */
 
         if (isp1760_hcd_is_set(hcd, PORT_OWNER))
             dev_err(hcd->self.controller, "PORT_OWNER is set\n");
 
         if (isp1760_hcd_is_set(hcd, PORT_CONNECT)) {
             status |= USB_PORT_STAT_CONNECTION;
             /* status may be from integrated TT */
             status |= USB_PORT_STAT_HIGH_SPEED;
         }
         if (isp1760_hcd_is_set(hcd, PORT_PE))
             status |= USB_PORT_STAT_ENABLE;
         if (isp1760_hcd_is_set(hcd, PORT_SUSPEND) &&
             isp1760_hcd_is_set(hcd, PORT_RESUME))
             status |= USB_PORT_STAT_SUSPEND;
         if (isp1760_hcd_is_set(hcd, PORT_RESET))
             status |= USB_PORT_STAT_RESET;
         if (isp1760_hcd_is_set(hcd, PORT_POWER))
             status |= USB_PORT_STAT_POWER;
 
         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:
         wIndex &= 0xff;
         if (!wIndex || wIndex > ports)
             goto error;
         wIndex--;
 
         if (isp1760_hcd_is_set(hcd, PORT_OWNER))
             break;
 
         switch (wValue) {
         case USB_PORT_FEAT_ENABLE:
             isp1760_hcd_set(hcd, PORT_PE);
             break;
 
         case USB_PORT_FEAT_SUSPEND:
             if (!isp1760_hcd_is_set(hcd, PORT_PE) ||
                 isp1760_hcd_is_set(hcd, PORT_RESET))
                 goto error;
 
             isp1760_hcd_set(hcd, PORT_SUSPEND);
             break;
         case USB_PORT_FEAT_POWER:
             if (isp1760_hcd_ppc_is_set(hcd))
                 isp1760_hcd_set(hcd, PORT_POWER);
             break;
         case USB_PORT_FEAT_RESET:
             if (isp1760_hcd_is_set(hcd, 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 ((isp1760_hcd_is_set(hcd, PORT_CONNECT) &&
                  !isp1760_hcd_is_set(hcd, PORT_PE)) &&
                 (isp1760_hcd_read(hcd, PORT_LSTATUS) == 1)) {
                 isp1760_hcd_set(hcd, PORT_OWNER);
             } else {
                 isp1760_hcd_set(hcd, PORT_RESET);
                 isp1760_hcd_clear(hcd, 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);
             }
             break;
         default:
             goto error;
         }
         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;
 
     fr = isp1760_hcd_read(hcd, HC_FRINDEX);
     return (fr >> 3) % priv->periodic_size;
 }
 
 static void isp1760_stop(struct usb_hcd *hcd)
 {
     struct isp1760_hcd *priv = hcd_to_priv(hcd);
 
     del_timer(&errata2_timer);
 
     isp1760_hub_control(hcd, ClearPortFeature, USB_PORT_FEAT_POWER, 1,
             NULL, 0);
     msleep(20);
 
     spin_lock_irq(&priv->lock);
     ehci_reset(hcd);
     /* Disable IRQ */
     isp1760_hcd_clear(hcd, HW_GLOBAL_INTR_EN);
     spin_unlock_irq(&priv->lock);
 
     isp1760_hcd_clear(hcd, FLAG_CF);
 }
 
 static void isp1760_shutdown(struct usb_hcd *hcd)
 {
     isp1760_stop(hcd);
 
     isp1760_hcd_clear(hcd, HW_GLOBAL_INTR_EN);
 
     isp1760_hcd_clear(hcd, CMD_RUN);
 }
 
 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);
 }
 
 
 static const struct hc_driver isp1760_hc_driver = {
     .description        = "isp1760-hcd",
     .product_desc       = "NXP ISP1760 USB Host Controller",
     .hcd_priv_size      = sizeof(struct isp1760_hcd *),
     .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,
     .clear_tt_buffer_complete   = isp1760_clear_tt_buffer_complete,
 };
 
 int __init isp1760_init_kmem_once(void)
 {
     urb_listitem_cachep = kmem_cache_create("isp1760_urb_listitem",
             sizeof(struct urb_listitem), 0, SLAB_TEMPORARY |
             SLAB_MEM_SPREAD, NULL);
 
     if (!urb_listitem_cachep)
         return -ENOMEM;
 
     qtd_cachep = kmem_cache_create("isp1760_qtd",
             sizeof(struct isp1760_qtd), 0, SLAB_TEMPORARY |
             SLAB_MEM_SPREAD, NULL);
 
     if (!qtd_cachep)
         goto destroy_urb_listitem;
 
     qh_cachep = kmem_cache_create("isp1760_qh", sizeof(struct isp1760_qh),
             0, SLAB_TEMPORARY | SLAB_MEM_SPREAD, NULL);
 
     if (!qh_cachep)
         goto destroy_qtd;
 
     return 0;
 
 destroy_qtd:
     kmem_cache_destroy(qtd_cachep);
 
 destroy_urb_listitem:
     kmem_cache_destroy(urb_listitem_cachep);
 
     return -ENOMEM;
 }
 
 void isp1760_deinit_kmem_cache(void)
 {
     kmem_cache_destroy(qtd_cachep);
     kmem_cache_destroy(qh_cachep);
     kmem_cache_destroy(urb_listitem_cachep);
 }
 
 int isp1760_hcd_register(struct isp1760_hcd *priv, struct resource *mem,
              int irq, unsigned long irqflags,
              struct device *dev)
 {
     const struct isp1760_memory_layout *mem_layout = priv->memory_layout;
     struct usb_hcd *hcd;
     int ret;
 
     hcd = usb_create_hcd(&isp1760_hc_driver, dev, dev_name(dev));
     if (!hcd)
         return -ENOMEM;
 
     *(struct isp1760_hcd **)hcd->hcd_priv = priv;
 
     priv->hcd = hcd;
 
     priv->atl_slots = kcalloc(mem_layout->slot_num,
                   sizeof(struct isp1760_slotinfo), GFP_KERNEL);
     if (!priv->atl_slots) {
         ret = -ENOMEM;
         goto put_hcd;
     }
 
     priv->int_slots = kcalloc(mem_layout->slot_num,
                   sizeof(struct isp1760_slotinfo), GFP_KERNEL);
     if (!priv->int_slots) {
         ret = -ENOMEM;
         goto free_atl_slots;
     }
 
     init_memory(priv);
 
     hcd->irq = irq;
     hcd->rsrc_start = mem->start;
     hcd->rsrc_len = resource_size(mem);
 
     /* This driver doesn't support wakeup requests */
     hcd->cant_recv_wakeups = 1;
 
     ret = usb_add_hcd(hcd, irq, irqflags);
     if (ret)
         goto free_int_slots;
 
     device_wakeup_enable(hcd->self.controller);
 
     return 0;
 
 free_int_slots:
     kfree(priv->int_slots);
 free_atl_slots:
     kfree(priv->atl_slots);
 put_hcd:
     usb_put_hcd(hcd);
     return ret;
 }
 
 void isp1760_hcd_unregister(struct isp1760_hcd *priv)
 {
     if (!priv->hcd)
         return;
 
     usb_remove_hcd(priv->hcd);
     usb_put_hcd(priv->hcd);
     kfree(priv->atl_slots);
     kfree(priv->int_slots);
 }