USB: ISP1760 HCD driver
Sebastian Siewior [Wed, 23 Apr 2008 22:37:04 +0000 (00:37 +0200)]
This driver has been written from scratch and supports the ISP1760. ISP1761
might (should) work as well but the OTG isn't supported. Also ISO packets are
not. However, it works on my little PowerPC board.

Signed-off-by: Sebastian Siewior <bigeasy@linutronix.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

drivers/usb/host/Kconfig
drivers/usb/host/Makefile
drivers/usb/host/isp1760-hcd.c [new file with mode: 0644]
drivers/usb/host/isp1760-hcd.h [new file with mode: 0644]
drivers/usb/host/isp1760-if.c [new file with mode: 0644]

index 0b87480..acac568 100644 (file)
@@ -95,6 +95,32 @@ config USB_ISP116X_HCD
          To compile this driver as a module, choose M here: the
          module will be called isp116x-hcd.
 
+config USB_ISP1760_HCD
+       tristate "ISP 1760 HCD support"
+       depends on USB && EXPERIMENTAL
+       ---help---
+         The ISP1760 chip is a USB 2.0 host controller.
+
+         This driver does not support isochronous transfers or OTG.
+
+         To compile this driver as a module, choose M here: the
+         module will be called isp1760-hcd.
+
+config USB_ISP1760_PCI
+       bool "Support for the PCI bus"
+       depends on USB_ISP1760_HCD && PCI
+       ---help---
+         Enables support for the device present on the PCI bus.
+         This should only be required if you happen to have the eval kit from
+         NXP and you are going to test it.
+
+config USB_ISP1760_OF
+       bool "Support for the OF platform bus"
+       depends on USB_ISP1760_HCD && OF
+       ---help---
+         Enables support for the device present on the PowerPC
+         OpenFirmware platform bus.
+
 config USB_OHCI_HCD
        tristate "OHCI HCD support"
        depends on USB && USB_ARCH_HAS_OHCI
index bb8e9d4..f1edda2 100644 (file)
@@ -6,6 +6,8 @@ ifeq ($(CONFIG_USB_DEBUG),y)
        EXTRA_CFLAGS            += -DDEBUG
 endif
 
+isp1760-objs := isp1760-hcd.o isp1760-if.o
+
 obj-$(CONFIG_PCI)              += pci-quirks.o
 
 obj-$(CONFIG_USB_EHCI_HCD)     += ehci-hcd.o
@@ -16,4 +18,4 @@ obj-$(CONFIG_USB_SL811_HCD)   += sl811-hcd.o
 obj-$(CONFIG_USB_SL811_CS)     += sl811_cs.o
 obj-$(CONFIG_USB_U132_HCD)     += u132-hcd.o
 obj-$(CONFIG_USB_R8A66597_HCD) += r8a66597-hcd.o
-
+obj-$(CONFIG_USB_ISP1760_HCD)  += isp1760.o
diff --git a/drivers/usb/host/isp1760-hcd.c b/drivers/usb/host/isp1760-hcd.c
new file mode 100644 (file)
index 0000000..4ba96c1
--- /dev/null
@@ -0,0 +1,2231 @@
+/*
+ * 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>
+ *
+ */
+#include <linux/module.h>
+#include <linux/kernel.h>
+#include <linux/slab.h>
+#include <linux/list.h>
+#include <linux/usb.h>
+#include <linux/debugfs.h>
+#include <linux/uaccess.h>
+#include <linux/io.h>
+#include <asm/unaligned.h>
+
+#include "../core/hcd.h"
+#include "isp1760-hcd.h"
+
+static struct kmem_cache *qtd_cachep;
+static struct kmem_cache *qh_cachep;
+
+struct isp1760_hcd {
+       u32 hcs_params;
+       spinlock_t              lock;
+       struct inter_packet_info atl_ints[32];
+       struct inter_packet_info int_ints[32];
+       struct memory_chunk memory_pool[BLOCKS];
+
+       /* periodic schedule support */
+#define        DEFAULT_I_TDPS          1024
+       unsigned                periodic_size;
+       unsigned                i_thresh;
+       unsigned long           reset_done;
+       unsigned long           next_statechange;
+};
+
+static inline struct isp1760_hcd *hcd_to_priv(struct usb_hcd *hcd)
+{
+       return (struct isp1760_hcd *) (hcd->hcd_priv);
+}
+static inline struct usb_hcd *priv_to_hcd(struct isp1760_hcd *priv)
+{
+       return container_of((void *) priv, struct usb_hcd, hcd_priv);
+}
+
+/* Section 2.2 Host Controller Capability Registers */
+#define HC_LENGTH(p)           (((p)>>00)&0x00ff)      /* bits 7:0 */
+#define HC_VERSION(p)          (((p)>>16)&0xffff)      /* bits 31:16 */
+#define HCS_INDICATOR(p)       ((p)&(1 << 16)) /* true: has port indicators */
+#define HCS_PPC(p)             ((p)&(1 << 4))  /* true: port power control */
+#define HCS_N_PORTS(p)         (((p)>>0)&0xf)  /* bits 3:0, ports on HC */
+#define HCC_ISOC_CACHE(p)       ((p)&(1 << 7))  /* true: can cache isoc frame */
+#define HCC_ISOC_THRES(p)       (((p)>>4)&0x7)  /* bits 6:4, uframes cached */
+
+/* Section 2.3 Host Controller Operational Registers */
+#define CMD_LRESET     (1<<7)          /* partial reset (no ports, etc) */
+#define CMD_RESET      (1<<1)          /* reset HC not bus */
+#define CMD_RUN                (1<<0)          /* start/stop HC */
+#define STS_PCD                (1<<2)          /* port change detect */
+#define FLAG_CF                (1<<0)          /* true: we'll support "high speed" */
+
+#define PORT_OWNER     (1<<13)         /* true: companion hc owns this port */
+#define PORT_POWER     (1<<12)         /* true: has power (see PPC) */
+#define PORT_USB11(x) (((x) & (3 << 10)) == (1 << 10)) /* USB 1.1 device */
+#define PORT_RESET     (1<<8)          /* reset port */
+#define PORT_SUSPEND   (1<<7)          /* suspend port */
+#define PORT_RESUME    (1<<6)          /* resume it */
+#define PORT_PE                (1<<2)          /* port enable */
+#define PORT_CSC       (1<<1)          /* connect status change */
+#define PORT_CONNECT   (1<<0)          /* device connected */
+#define PORT_RWC_BITS   (PORT_CSC)
+
+struct isp1760_qtd {
+       struct isp1760_qtd *hw_next;
+       u8 packet_type;
+       u8 toggle;
+
+       void *data_buffer;
+       /* the rest is HCD-private */
+       struct list_head qtd_list;
+       struct urb *urb;
+       size_t length;
+
+       /* isp special*/
+       u32 status;
+#define URB_COMPLETE_NOTIFY    (1 << 0)
+#define URB_ENQUEUED           (1 << 1)
+#define URB_TYPE_ATL           (1 << 2)
+#define URB_TYPE_INT           (1 << 3)
+};
+
+struct isp1760_qh {
+       /* first part defined by EHCI spec */
+       struct list_head qtd_list;
+       struct isp1760_hcd *priv;
+
+       /* periodic schedule info */
+       unsigned short period;          /* polling interval */
+       struct usb_device *dev;
+
+       u32 toggle;
+       u32 ping;
+};
+
+#define ehci_port_speed(priv, portsc) (1 << USB_PORT_FEAT_HIGHSPEED)
+
+static unsigned int isp1760_readl(__u32 __iomem *regs)
+{
+       return readl(regs);
+}
+
+static void isp1760_writel(const unsigned int val, __u32 __iomem *regs)
+{
+       writel(val, regs);
+}
+
+/*
+ * The next two 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 priv_read_copy(struct isp1760_hcd *priv, u32 *src,
+               __u32 __iomem *dst, u32 offset, u32 len)
+{
+       struct usb_hcd *hcd = priv_to_hcd(priv);
+       u32 val;
+       u8 *buff8;
+
+       if (!src) {
+               printk(KERN_ERR "ERROR: buffer: %p len: %d\n", src, len);
+               return;
+       }
+       isp1760_writel(offset,  hcd->regs + HC_MEMORY_REG);
+       /* XXX
+        * 90nsec delay, the spec says something how this could be avoided.
+        */
+       mdelay(1);
+
+       while (len >= 4) {
+               *src = __raw_readl(dst);
+               len -= 4;
+               src++;
+               dst++;
+       }
+
+       if (!len)
+               return;
+
+       /* in case we have 3, 2 or 1 by left. The dst buffer may not be fully
+        * allocated.
+        */
+       val = isp1760_readl(dst);
+
+       buff8 = (u8 *)src;
+       while (len) {
+
+               *buff8 = val;
+               val >>= 8;
+               len--;
+               buff8++;
+       }
+}
+
+static void priv_write_copy(const struct isp1760_hcd *priv, const u32 *src,
+               __u32 __iomem *dst, u32 len)
+{
+       while (len >= 4) {
+               __raw_writel(*src, dst);
+               len -= 4;
+               src++;
+               dst++;
+       }
+
+       if (!len)
+               return;
+       /* in case we have 3, 2 or 1 by left. The buffer is allocated and the
+        * extra bytes should not be read by the HW
+        */
+
+       __raw_writel(*src, dst);
+}
+
+/* memory management of the 60kb on the chip from 0x1000 to 0xffff */
+static void init_memory(struct isp1760_hcd *priv)
+{
+       int i;
+       u32 payload;
+
+       payload = 0x1000;
+       for (i = 0; i < BLOCK_1_NUM; i++) {
+               priv->memory_pool[i].start = payload;
+               priv->memory_pool[i].size = BLOCK_1_SIZE;
+               priv->memory_pool[i].free = 1;
+               payload += priv->memory_pool[i].size;
+       }
+
+
+       for (i = BLOCK_1_NUM; i < BLOCK_1_NUM + BLOCK_2_NUM; i++) {
+               priv->memory_pool[i].start = payload;
+               priv->memory_pool[i].size = BLOCK_2_SIZE;
+               priv->memory_pool[i].free = 1;
+               payload += priv->memory_pool[i].size;
+       }
+
+
+       for (i = BLOCK_1_NUM + BLOCK_2_NUM; i < BLOCKS; i++) {
+               priv->memory_pool[i].start = payload;
+               priv->memory_pool[i].size = BLOCK_3_SIZE;
+               priv->memory_pool[i].free = 1;
+               payload += priv->memory_pool[i].size;
+       }
+
+       BUG_ON(payload - priv->memory_pool[i - 1].size > PAYLOAD_SIZE);
+}
+
+static u32 alloc_mem(struct isp1760_hcd *priv, u32 size)
+{
+       int i;
+
+       if (!size)
+               return ISP1760_NULL_POINTER;
+
+       for (i = 0; i < BLOCKS; i++) {
+               if (priv->memory_pool[i].size >= size &&
+                               priv->memory_pool[i].free) {
+
+                       priv->memory_pool[i].free = 0;
+                       return priv->memory_pool[i].start;
+               }
+       }
+
+       printk(KERN_ERR "ISP1760 MEM: can not allocate %d bytes of memory\n",
+                       size);
+       printk(KERN_ERR "Current memory map:\n");
+       for (i = 0; i < BLOCKS; i++) {
+               printk(KERN_ERR "Pool %2d size %4d status: %d\n",
+                               i, priv->memory_pool[i].size,
+                               priv->memory_pool[i].free);
+       }
+       /* XXX maybe -ENOMEM could be possible */
+       BUG();
+       return 0;
+}
+
+static void free_mem(struct isp1760_hcd *priv, u32 mem)
+{
+       int i;
+
+       if (mem == ISP1760_NULL_POINTER)
+               return;
+
+       for (i = 0; i < BLOCKS; i++) {
+               if (priv->memory_pool[i].start == mem) {
+
+                       BUG_ON(priv->memory_pool[i].free);
+
+                       priv->memory_pool[i].free = 1;
+                       return ;
+               }
+       }
+
+       printk(KERN_ERR "Trying to free not-here-allocated memory :%08x\n",
+                       mem);
+       BUG();
+}
+
+static void isp1760_init_regs(struct usb_hcd *hcd)
+{
+       isp1760_writel(0, hcd->regs + HC_BUFFER_STATUS_REG);
+       isp1760_writel(NO_TRANSFER_ACTIVE, hcd->regs +
+                       HC_ATL_PTD_SKIPMAP_REG);
+       isp1760_writel(NO_TRANSFER_ACTIVE, hcd->regs +
+                       HC_INT_PTD_SKIPMAP_REG);
+       isp1760_writel(NO_TRANSFER_ACTIVE, hcd->regs +
+                       HC_ISO_PTD_SKIPMAP_REG);
+
+       isp1760_writel(~NO_TRANSFER_ACTIVE, hcd->regs +
+                       HC_ATL_PTD_DONEMAP_REG);
+       isp1760_writel(~NO_TRANSFER_ACTIVE, hcd->regs +
+                       HC_INT_PTD_DONEMAP_REG);
+       isp1760_writel(~NO_TRANSFER_ACTIVE, hcd->regs +
+                       HC_ISO_PTD_DONEMAP_REG);
+}
+
+static int handshake(struct isp1760_hcd *priv, void __iomem *ptr,
+                     u32 mask, u32 done, int usec)
+{
+       u32 result;
+
+       do {
+               result = isp1760_readl(ptr);
+               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 */
+static int ehci_reset(struct isp1760_hcd *priv)
+{
+       int retval;
+       struct usb_hcd *hcd = priv_to_hcd(priv);
+       u32 command = isp1760_readl(hcd->regs + HC_USBCMD);
+
+       command |= CMD_RESET;
+       isp1760_writel(command, hcd->regs + HC_USBCMD);
+       hcd->state = HC_STATE_HALT;
+       priv->next_statechange = jiffies;
+       retval = handshake(priv, hcd->regs + HC_USBCMD,
+                           CMD_RESET, 0, 250 * 1000);
+       return retval;
+}
+
+static void qh_destroy(struct isp1760_qh *qh)
+{
+       BUG_ON(!list_empty(&qh->qtd_list));
+       kmem_cache_free(qh_cachep, qh);
+}
+
+static struct isp1760_qh *isp1760_qh_alloc(struct isp1760_hcd *priv,
+               gfp_t flags)
+{
+       struct isp1760_qh *qh;
+
+       qh = kmem_cache_zalloc(qh_cachep, flags);
+       if (!qh)
+               return qh;
+
+       INIT_LIST_HEAD(&qh->qtd_list);
+       qh->priv = priv;
+       return qh;
+}
+
+/* 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 */
+
+/* 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;
+
+       spin_lock_init(&priv->lock);
+
+       /*
+        * 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 ... */
+       hcc_params = isp1760_readl(hcd->regs + HC_HCCPARAMS);
+       /* 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;
+       u32 scratch;
+
+       isp1760_writel(0xdeadbabe, hcd->regs + HC_SCRATCH_REG);
+       scratch = isp1760_readl(hcd->regs + HC_SCRATCH_REG);
+       if (scratch != 0xdeadbabe) {
+               printk(KERN_ERR "ISP1760: Scratch test failed.\n");
+               return -ENODEV;
+       }
+
+       /* pre reset */
+       isp1760_init_regs(hcd);
+
+       /* reset */
+       isp1760_writel(SW_RESET_RESET_ALL, hcd->regs + HC_RESET_REG);
+       mdelay(100);
+
+       isp1760_writel(SW_RESET_RESET_HC, hcd->regs + HC_RESET_REG);
+       mdelay(100);
+
+       result = ehci_reset(priv);
+       if (result)
+               return result;
+
+       /* Step 11 passed */
+
+       isp1760_writel(INTERRUPT_ENABLE_MASK, hcd->regs + HC_INTERRUPT_REG);
+       isp1760_writel(INTERRUPT_ENABLE_MASK, hcd->regs + HC_INTERRUPT_ENABLE);
+
+       /* ATL reset */
+       scratch = isp1760_readl(hcd->regs + HC_HW_MODE_CTRL);
+       isp1760_writel(scratch | ALL_ATX_RESET, hcd->regs + HC_HW_MODE_CTRL);
+       mdelay(10);
+       isp1760_writel(scratch, hcd->regs + HC_HW_MODE_CTRL);
+
+       isp1760_writel(PORT1_POWER | PORT1_INIT2, hcd->regs + HC_PORT1_CTRL);
+       mdelay(10);
+
+       priv->hcs_params = isp1760_readl(hcd->regs + HC_HCSPARAMS);
+
+       return priv_init(hcd);
+}
+
+static void isp1760_init_maps(struct usb_hcd *hcd)
+{
+       /*set last maps, for iso its only 1, else 32 tds bitmap*/
+       isp1760_writel(0x80000000, hcd->regs + HC_ATL_PTD_LASTPTD_REG);
+       isp1760_writel(0x80000000, hcd->regs + HC_INT_PTD_LASTPTD_REG);
+       isp1760_writel(0x00000001, hcd->regs + HC_ISO_PTD_LASTPTD_REG);
+}
+
+static void isp1760_enable_interrupts(struct usb_hcd *hcd)
+{
+       isp1760_writel(0, hcd->regs + HC_ATL_IRQ_MASK_AND_REG);
+       isp1760_writel(0, hcd->regs + HC_ATL_IRQ_MASK_OR_REG);
+       isp1760_writel(0, hcd->regs + HC_INT_IRQ_MASK_AND_REG);
+       isp1760_writel(0, hcd->regs + HC_INT_IRQ_MASK_OR_REG);
+       isp1760_writel(0, hcd->regs + HC_ISO_IRQ_MASK_AND_REG);
+       isp1760_writel(0xffffffff, hcd->regs + HC_ISO_IRQ_MASK_OR_REG);
+       /* step 23 passed */
+}
+
+static int isp1760_run(struct usb_hcd *hcd)
+{
+       struct isp1760_hcd *priv = hcd_to_priv(hcd);
+       int retval;
+       u32 temp;
+       u32 command;
+       u32 chipid;
+
+       hcd->uses_new_polling = 1;
+       hcd->poll_rh = 0;
+
+       hcd->state = HC_STATE_RUNNING;
+       isp1760_enable_interrupts(hcd);
+       temp = isp1760_readl(hcd->regs + HC_HW_MODE_CTRL);
+       temp |= FINAL_HW_CONFIG;
+       isp1760_writel(temp, hcd->regs + HC_HW_MODE_CTRL);
+
+       command = isp1760_readl(hcd->regs + HC_USBCMD);
+       command &= ~(CMD_LRESET|CMD_RESET);
+       command |= CMD_RUN;
+       isp1760_writel(command, hcd->regs + HC_USBCMD);
+
+       retval = handshake(priv, hcd->regs + 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);
+       isp1760_writel(FLAG_CF, hcd->regs + HC_CONFIGFLAG);
+
+       retval = handshake(priv, hcd->regs + HC_CONFIGFLAG, FLAG_CF, FLAG_CF,
+                       250 * 1000);
+       up_write(&ehci_cf_port_reset_rwsem);
+       if (retval)
+               return retval;
+
+       chipid = isp1760_readl(hcd->regs + HC_CHIP_ID_REG);
+       isp1760_info(priv, "USB ISP %04x HW rev. %d started\n", chipid & 0xffff,
+                       chipid >> 16);
+
+       /* PTD Register Init Part 2, Step 28 */
+       /* enable INTs */
+       isp1760_init_maps(hcd);
+
+       /* 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 u32 base_to_chip(u32 base)
+{
+       return ((base - 0x400) >> 3);
+}
+
+static void transform_into_atl(struct isp1760_hcd *priv, struct isp1760_qh *qh,
+                       struct isp1760_qtd *qtd, struct urb *urb,
+                       u32 payload, struct ptd *ptd)
+{
+       u32 dw0;
+       u32 dw1;
+       u32 dw2;
+       u32 dw3;
+       u32 maxpacket;
+       u32 multi;
+       u32 pid_code;
+       u32 rl = RL_COUNTER;
+       u32 nak = NAK_COUNTER;
+
+       /* according to 3.6.2, max packet len can not be > 0x400 */
+       maxpacket = usb_maxpacket(urb->dev, urb->pipe, usb_pipeout(urb->pipe));
+       multi =  1 + ((maxpacket >> 11) & 0x3);
+       maxpacket &= 0x7ff;
+
+       /* DW0 */
+       dw0 = PTD_VALID;
+       dw0 |= PTD_LENGTH(qtd->length);
+       dw0 |= PTD_MAXPACKET(maxpacket);
+       dw0 |= PTD_ENDPOINT(usb_pipeendpoint(urb->pipe));
+       dw1 = usb_pipeendpoint(urb->pipe) >> 1;
+
+       /* DW1 */
+       dw1 |= PTD_DEVICE_ADDR(usb_pipedevice(urb->pipe));
+
+       pid_code = qtd->packet_type;
+       dw1 |= PTD_PID_TOKEN(pid_code);
+
+       if (usb_pipebulk(urb->pipe))
+               dw1 |= PTD_TRANS_BULK;
+       else if  (usb_pipeint(urb->pipe))
+               dw1 |= PTD_TRANS_INT;
+
+       if (urb->dev->speed != USB_SPEED_HIGH) {
+               /* split transaction */
+
+               dw1 |= PTD_TRANS_SPLIT;
+               if (urb->dev->speed == USB_SPEED_LOW)
+                       dw1 |= PTD_SE_USB_LOSPEED;
+
+               dw1 |= PTD_PORT_NUM(urb->dev->ttport);
+               dw1 |= PTD_HUB_NUM(urb->dev->tt->hub->devnum);
+
+               /* SE bit for Split INT transfers */
+               if (usb_pipeint(urb->pipe) &&
+                               (urb->dev->speed == USB_SPEED_LOW))
+                       dw1 |= 2 << 16;
+
+               dw3 = 0;
+               rl = 0;
+               nak = 0;
+       } else {
+               dw0 |= PTD_MULTI(multi);
+               if (usb_pipecontrol(urb->pipe) || usb_pipebulk(urb->pipe))
+                       dw3 = qh->ping;
+               else
+                       dw3 = 0;
+       }
+       /* DW2 */
+       dw2 = 0;
+       dw2 |= PTD_DATA_START_ADDR(base_to_chip(payload));
+       dw2 |= PTD_RL_CNT(rl);
+       dw3 |= PTD_NAC_CNT(nak);
+
+       /* DW3 */
+       if (usb_pipecontrol(urb->pipe))
+               dw3 |= PTD_DATA_TOGGLE(qtd->toggle);
+       else
+               dw3 |= qh->toggle;
+
+
+       dw3 |= PTD_ACTIVE;
+       /* Cerr */
+       dw3 |= PTD_CERR(ERR_COUNTER);
+
+       memset(ptd, 0, sizeof(*ptd));
+
+       ptd->dw0 = cpu_to_le32(dw0);
+       ptd->dw1 = cpu_to_le32(dw1);
+       ptd->dw2 = cpu_to_le32(dw2);
+       ptd->dw3 = cpu_to_le32(dw3);
+}
+
+static void transform_add_int(struct isp1760_hcd *priv, struct isp1760_qh *qh,
+                       struct isp1760_qtd *qtd, struct urb *urb,
+                       u32 payload, struct ptd *ptd)
+{
+       u32 maxpacket;
+       u32 multi;
+       u32 numberofusofs;
+       u32 i;
+       u32 usofmask, usof;
+       u32 period;
+
+       maxpacket = usb_maxpacket(urb->dev, urb->pipe, usb_pipeout(urb->pipe));
+       multi =  1 + ((maxpacket >> 11) & 0x3);
+       maxpacket &= 0x7ff;
+       /* length of the data per uframe */
+       maxpacket = multi * maxpacket;
+
+       numberofusofs = urb->transfer_buffer_length / maxpacket;
+       if (urb->transfer_buffer_length % maxpacket)
+               numberofusofs += 1;
+
+       usofmask = 1;
+       usof = 0;
+       for (i = 0; i < numberofusofs; i++) {
+               usof |= usofmask;
+               usofmask <<= 1;
+       }
+
+       if (urb->dev->speed != USB_SPEED_HIGH) {
+               /* split */
+               ptd->dw5 = __constant_cpu_to_le32(0x1c);
+
+               if (qh->period >= 32)
+                       period = qh->period / 2;
+               else
+                       period = qh->period;
+
+       } else {
+
+               if (qh->period >= 8)
+                       period = qh->period/8;
+               else
+                       period = qh->period;
+
+               if (period >= 32)
+                       period  = 16;
+
+               if (qh->period >= 8) {
+                       /* millisecond period */
+                       period = (period << 3);
+               } else {
+                       /* usof based tranmsfers */
+                       /* minimum 4 usofs */
+                       usof = 0x11;
+               }
+       }
+
+       ptd->dw2 |= cpu_to_le32(period);
+       ptd->dw4 = cpu_to_le32(usof);
+}
+
+static void transform_into_int(struct isp1760_hcd *priv, struct isp1760_qh *qh,
+                       struct isp1760_qtd *qtd, struct urb *urb,
+                       u32 payload, struct ptd *ptd)
+{
+       transform_into_atl(priv, qh, qtd, urb, payload, ptd);
+       transform_add_int(priv, qh, qtd, urb,  payload, ptd);
+}
+
+static int qtd_fill(struct isp1760_qtd *qtd, void *databuffer, size_t len,
+               u32 token)
+{
+       int count;
+
+       qtd->data_buffer = databuffer;
+       qtd->packet_type = GET_QTD_TOKEN_TYPE(token);
+       qtd->toggle = GET_DATA_TOGGLE(token);
+
+       if (len > HC_ATL_PL_SIZE)
+               count = HC_ATL_PL_SIZE;
+       else
+               count = len;
+
+       qtd->length = count;
+       return count;
+}
+
+static int check_error(struct ptd *ptd)
+{
+       int error = 0;
+       u32 dw3;
+
+       dw3 = le32_to_cpu(ptd->dw3);
+       if (dw3 & DW3_HALT_BIT)
+               error = -EPIPE;
+
+       if (dw3 & DW3_ERROR_BIT) {
+               printk(KERN_ERR "error bit is set in DW3\n");
+               error = -EPIPE;
+       }
+
+       if (dw3 & DW3_QTD_ACTIVE) {
+               printk(KERN_ERR "transfer active bit is set DW3\n");
+               printk(KERN_ERR "nak counter: %d, rl: %d\n", (dw3 >> 19) & 0xf,
+                               (le32_to_cpu(ptd->dw2) >> 25) & 0xf);
+       }
+
+       return error;
+}
+
+static void check_int_err_status(u32 dw4)
+{
+       u32 i;
+
+       dw4 >>= 8;
+
+       for (i = 0; i < 8; i++) {
+               switch (dw4 & 0x7) {
+               case INT_UNDERRUN:
+                       printk(KERN_ERR "ERROR: under run , %d\n", i);
+                       break;
+
+               case INT_EXACT:
+                       printk(KERN_ERR "ERROR: transaction error, %d\n", i);
+                       break;
+
+               case INT_BABBLE:
+                       printk(KERN_ERR "ERROR: babble error, %d\n", i);
+                       break;
+               }
+               dw4 >>= 3;
+       }
+}
+
+static void enqueue_one_qtd(struct isp1760_qtd *qtd, struct isp1760_hcd *priv,
+               u32 payload)
+{
+       u32 token;
+       struct usb_hcd *hcd = priv_to_hcd(priv);
+
+       token = qtd->packet_type;
+
+       if (qtd->length && (qtd->length <= HC_ATL_PL_SIZE)) {
+               switch (token) {
+               case IN_PID:
+                       break;
+               case OUT_PID:
+               case SETUP_PID:
+                       priv_write_copy(priv, qtd->data_buffer,
+                                       hcd->regs + payload,
+                                       qtd->length);
+               }
+       }
+}
+
+static void enqueue_one_atl_qtd(u32 atl_regs, u32 payload,
+               struct isp1760_hcd *priv, struct isp1760_qh *qh,
+               struct urb *urb, u32 slot, struct isp1760_qtd *qtd)
+{
+       struct ptd ptd;
+       struct usb_hcd *hcd = priv_to_hcd(priv);
+
+       transform_into_atl(priv, qh, qtd, urb, payload, &ptd);
+       priv_write_copy(priv, (u32 *)&ptd, hcd->regs + atl_regs, sizeof(ptd));
+       enqueue_one_qtd(qtd, priv, payload);
+
+       priv->atl_ints[slot].urb = urb;
+       priv->atl_ints[slot].qh = qh;
+       priv->atl_ints[slot].qtd = qtd;
+       priv->atl_ints[slot].data_buffer = qtd->data_buffer;
+       priv->atl_ints[slot].payload = payload;
+       qtd->status |= URB_ENQUEUED | URB_TYPE_ATL;
+       qtd->status |= slot << 16;
+}
+
+static void enqueue_one_int_qtd(u32 int_regs, u32 payload,
+               struct isp1760_hcd *priv, struct isp1760_qh *qh,
+               struct urb *urb, u32 slot,  struct isp1760_qtd *qtd)
+{
+       struct ptd ptd;
+       struct usb_hcd *hcd = priv_to_hcd(priv);
+
+       transform_into_int(priv, qh, qtd, urb, payload, &ptd);
+       priv_write_copy(priv, (u32 *)&ptd, hcd->regs + int_regs, sizeof(ptd));
+       enqueue_one_qtd(qtd, priv, payload);
+
+       priv->int_ints[slot].urb = urb;
+       priv->int_ints[slot].qh = qh;
+       priv->int_ints[slot].qtd = qtd;
+       priv->int_ints[slot].data_buffer = qtd->data_buffer;
+       priv->int_ints[slot].payload = payload;
+       qtd->status |= URB_ENQUEUED | URB_TYPE_INT;
+       qtd->status |= slot << 16;
+}
+
+void enqueue_an_ATL_packet(struct usb_hcd *hcd, struct isp1760_qh *qh,
+               struct isp1760_qtd *qtd)
+{
+       struct isp1760_hcd *priv = hcd_to_priv(hcd);
+       u32 skip_map, or_map;
+       u32 queue_entry;
+       u32 slot;
+       u32 atl_regs, payload;
+       u32 buffstatus;
+
+       skip_map = isp1760_readl(hcd->regs + HC_ATL_PTD_SKIPMAP_REG);
+
+       BUG_ON(!skip_map);
+       slot = __ffs(skip_map);
+       queue_entry = 1 << slot;
+
+       atl_regs = ATL_REGS_OFFSET + slot * sizeof(struct ptd);
+
+       payload = alloc_mem(priv, qtd->length);
+
+       enqueue_one_atl_qtd(atl_regs, payload, priv, qh, qtd->urb, slot, qtd);
+
+       or_map = isp1760_readl(hcd->regs + HC_ATL_IRQ_MASK_OR_REG);
+       or_map |= queue_entry;
+       isp1760_writel(or_map, hcd->regs + HC_ATL_IRQ_MASK_OR_REG);
+
+       skip_map &= ~queue_entry;
+       isp1760_writel(skip_map, hcd->regs + HC_ATL_PTD_SKIPMAP_REG);
+
+       buffstatus = isp1760_readl(hcd->regs + HC_BUFFER_STATUS_REG);
+       buffstatus |= ATL_BUFFER;
+       isp1760_writel(buffstatus, hcd->regs + HC_BUFFER_STATUS_REG);
+}
+
+void enqueue_an_INT_packet(struct usb_hcd *hcd, struct isp1760_qh *qh,
+               struct isp1760_qtd *qtd)
+{
+       struct isp1760_hcd *priv = hcd_to_priv(hcd);
+       u32 skip_map, or_map;
+       u32 queue_entry;
+       u32 slot;
+       u32 int_regs, payload;
+       u32 buffstatus;
+
+       skip_map = isp1760_readl(hcd->regs + HC_INT_PTD_SKIPMAP_REG);
+
+       BUG_ON(!skip_map);
+       slot = __ffs(skip_map);
+       queue_entry = 1 << slot;
+
+       int_regs = INT_REGS_OFFSET + slot * sizeof(struct ptd);
+
+       payload = alloc_mem(priv, qtd->length);
+
+       enqueue_one_int_qtd(int_regs, payload, priv, qh, qtd->urb, slot, qtd);
+
+       or_map = isp1760_readl(hcd->regs + HC_INT_IRQ_MASK_OR_REG);
+       or_map |= queue_entry;
+       isp1760_writel(or_map, hcd->regs + HC_INT_IRQ_MASK_OR_REG);
+
+       skip_map &= ~queue_entry;
+       isp1760_writel(skip_map, hcd->regs + HC_INT_PTD_SKIPMAP_REG);
+
+       buffstatus = isp1760_readl(hcd->regs + HC_BUFFER_STATUS_REG);
+       buffstatus |= INT_BUFFER;
+       isp1760_writel(buffstatus, hcd->regs + HC_BUFFER_STATUS_REG);
+}
+
+static void isp1760_urb_done(struct isp1760_hcd *priv, struct urb *urb, int status)
+__releases(priv->lock)
+__acquires(priv->lock)
+{
+       if (!urb->unlinked) {
+               if (status == -EINPROGRESS)
+                       status = 0;
+       }
+
+       /* complete() can reenter this HCD */
+       usb_hcd_unlink_urb_from_ep(priv_to_hcd(priv), urb);
+       spin_unlock(&priv->lock);
+       usb_hcd_giveback_urb(priv_to_hcd(priv), urb, status);
+       spin_lock(&priv->lock);
+}
+
+static void isp1760_qtd_free(struct isp1760_qtd *qtd)
+{
+       kmem_cache_free(qtd_cachep, qtd);
+}
+
+static struct isp1760_qtd *clean_this_qtd(struct isp1760_qtd *qtd)
+{
+       struct isp1760_qtd *tmp_qtd;
+
+       tmp_qtd = qtd->hw_next;
+       list_del(&qtd->qtd_list);
+       isp1760_qtd_free(qtd);
+       return tmp_qtd;
+}
+
+/*
+ * Remove this QTD from the QH list and free its memory. If this QTD
+ * isn't the last one than remove also his successor(s).
+ * Returns the QTD which is part of an new URB and should be enqueued.
+ */
+static struct isp1760_qtd *clean_up_qtdlist(struct isp1760_qtd *qtd)
+{
+       struct isp1760_qtd *tmp_qtd;
+       int last_one;
+
+       do {
+               tmp_qtd = qtd->hw_next;
+               last_one = qtd->status & URB_COMPLETE_NOTIFY;
+               list_del(&qtd->qtd_list);
+               isp1760_qtd_free(qtd);
+               qtd = tmp_qtd;
+       } while (!last_one && qtd);
+
+       return qtd;
+}
+
+static void do_atl_int(struct usb_hcd *usb_hcd)
+{
+       struct isp1760_hcd *priv = hcd_to_priv(usb_hcd);
+       u32 done_map, skip_map;
+       struct ptd ptd;
+       struct urb *urb = NULL;
+       u32 atl_regs_base;
+       u32 atl_regs;
+       u32 queue_entry;
+       u32 payload;
+       u32 length;
+       u32 or_map;
+       u32 status = -EINVAL;
+       int error;
+       struct isp1760_qtd *qtd;
+       struct isp1760_qh *qh;
+       u32 rl;
+       u32 nakcount;
+
+       done_map = isp1760_readl(usb_hcd->regs +
+                       HC_ATL_PTD_DONEMAP_REG);
+       skip_map = isp1760_readl(usb_hcd->regs +
+                       HC_ATL_PTD_SKIPMAP_REG);
+
+       or_map = isp1760_readl(usb_hcd->regs + HC_ATL_IRQ_MASK_OR_REG);
+       or_map &= ~done_map;
+       isp1760_writel(or_map, usb_hcd->regs + HC_ATL_IRQ_MASK_OR_REG);
+
+       atl_regs_base = ATL_REGS_OFFSET;
+       while (done_map) {
+               u32 dw1;
+               u32 dw2;
+               u32 dw3;
+
+               status = 0;
+
+               queue_entry = __ffs(done_map);
+               done_map &= ~(1 << queue_entry);
+               skip_map |= 1 << queue_entry;
+
+               atl_regs = atl_regs_base + queue_entry * sizeof(struct ptd);
+
+               urb = priv->atl_ints[queue_entry].urb;
+               qtd = priv->atl_ints[queue_entry].qtd;
+               qh = priv->atl_ints[queue_entry].qh;
+               payload = priv->atl_ints[queue_entry].payload;
+
+               if (!qh) {
+                       printk(KERN_ERR "qh is 0\n");
+                       continue;
+               }
+               priv_read_copy(priv, (u32 *)&ptd, usb_hcd->regs + atl_regs,
+                               atl_regs, sizeof(ptd));
+
+               dw1 = le32_to_cpu(ptd.dw1);
+               dw2 = le32_to_cpu(ptd.dw2);
+               dw3 = le32_to_cpu(ptd.dw3);
+               rl = (dw2 >> 25) & 0x0f;
+               nakcount = (dw3 >> 19) & 0xf;
+
+               /* Transfer Error, *but* active and no HALT -> reload */
+               if ((dw3 & DW3_ERROR_BIT) && (dw3 & DW3_QTD_ACTIVE) &&
+                               !(dw3 & DW3_HALT_BIT)) {
+
+                       /* according to ppriv code, we have to
+                        * reload this one if trasfered bytes != requested bytes
+                        * else act like everything went smooth..
+                        * XXX This just doesn't feel right and hasn't
+                        * triggered so far.
+                        */
+
+                       length = PTD_XFERRED_LENGTH(dw3);
+                       printk(KERN_ERR "Should reload now.... transfered %d "
+                                       "of %zu\n", length, qtd->length);
+                       BUG();
+               }
+
+               if (!nakcount && (dw3 & DW3_QTD_ACTIVE)) {
+                       u32 buffstatus;
+
+                       /* XXX
+                        * NAKs are handled in HW by the chip. Usually if the
+                        * device is not able to send data fast enough.
+                        * This did not trigger for a long time now.
+                        */
+                       printk(KERN_ERR "Reloading ptd %p/%p... qh %p readed: "
+                                       "%d of %d done: %08x cur: %08x\n", qtd,
+                                       urb, qh, PTD_XFERRED_LENGTH(dw3),
+                                       qtd->length, done_map,
+                                       (1 << queue_entry));
+
+                       /* RL counter = ERR counter */
+                       dw3 &= ~(0xf << 19);
+                       dw3 |= rl << 19;
+                       dw3 &= ~(3 << (55 - 32));
+                       dw3 |= ERR_COUNTER << (55 - 32);
+
+                       /*
+                        * It is not needed to write skip map back because it
+                        * is unchanged. Just make sure that this entry is
+                        * unskipped once it gets written to the HW.
+                        */
+                       skip_map &= ~(1 << queue_entry);
+                       or_map = isp1760_readl(usb_hcd->regs +
+                                       HC_ATL_IRQ_MASK_OR_REG);
+                       or_map |= 1 << queue_entry;
+                       isp1760_writel(or_map, usb_hcd->regs +
+                                       HC_ATL_IRQ_MASK_OR_REG);
+
+                       ptd.dw3 = cpu_to_le32(dw3);
+                       priv_write_copy(priv, (u32 *)&ptd, usb_hcd->regs +
+                                       atl_regs, sizeof(ptd));
+
+                       ptd.dw0 |= __constant_cpu_to_le32(PTD_VALID);
+                       priv_write_copy(priv, (u32 *)&ptd, usb_hcd->regs +
+                                       atl_regs, sizeof(ptd));
+
+                       buffstatus = isp1760_readl(usb_hcd->regs +
+                                       HC_BUFFER_STATUS_REG);
+                       buffstatus |= ATL_BUFFER;
+                       isp1760_writel(buffstatus, usb_hcd->regs +
+                                       HC_BUFFER_STATUS_REG);
+                       continue;
+               }
+
+               error = check_error(&ptd);
+               if (error) {
+                       status = error;
+                       priv->atl_ints[queue_entry].qh->toggle = 0;
+                       priv->atl_ints[queue_entry].qh->ping = 0;
+                       urb->status = -EPIPE;
+
+#if 0
+                       printk(KERN_ERR "Error in %s().\n", __func__);
+                       printk(KERN_ERR "IN dw0: %08x dw1: %08x dw2: %08x "
+                                       "dw3: %08x dw4: %08x dw5: %08x dw6: "
+                                       "%08x dw7: %08x\n",
+                                       ptd.dw0, ptd.dw1, ptd.dw2, ptd.dw3,
+                                       ptd.dw4, ptd.dw5, ptd.dw6, ptd.dw7);
+#endif
+               } else {
+                       if (usb_pipetype(urb->pipe) == PIPE_BULK) {
+                               priv->atl_ints[queue_entry].qh->toggle = dw3 &
+                                       (1 << 25);
+                               priv->atl_ints[queue_entry].qh->ping = dw3 &
+                                       (1 << 26);
+                       }
+               }
+
+               length = PTD_XFERRED_LENGTH(dw3);
+               if (length) {
+                       switch (DW1_GET_PID(dw1)) {
+                       case IN_PID:
+                               priv_read_copy(priv,
+                                       priv->atl_ints[queue_entry].data_buffer,
+                                       usb_hcd->regs + payload, payload,
+                                       length);
+
+                       case OUT_PID:
+
+                               urb->actual_length += length;
+
+                       case SETUP_PID:
+                               break;
+                       }
+               }
+
+               priv->atl_ints[queue_entry].data_buffer = NULL;
+               priv->atl_ints[queue_entry].urb = NULL;
+               priv->atl_ints[queue_entry].qtd = NULL;
+               priv->atl_ints[queue_entry].qh = NULL;
+
+               free_mem(priv, payload);
+
+               isp1760_writel(skip_map, usb_hcd->regs +
+                               HC_ATL_PTD_SKIPMAP_REG);
+
+               if (urb->status == -EPIPE) {
+                       /* HALT was received */
+
+                       qtd = clean_up_qtdlist(qtd);
+                       isp1760_urb_done(priv, urb, urb->status);
+
+               } else if (usb_pipebulk(urb->pipe) && (length < qtd->length)) {
+                       /* short BULK received */
+
+                       printk(KERN_ERR "short bulk, %d instead %d\n", length,
+                                       qtd->length);
+                       if (urb->transfer_flags & URB_SHORT_NOT_OK) {
+                               urb->status = -EREMOTEIO;
+                               printk(KERN_ERR "not okey\n");
+                       }
+
+                       if (urb->status == -EINPROGRESS)
+                               urb->status = 0;
+
+                       qtd = clean_up_qtdlist(qtd);
+
+                       isp1760_urb_done(priv, urb, urb->status);
+
+               } else if (qtd->status & URB_COMPLETE_NOTIFY) {
+                       /* that was the last qtd of that URB */
+
+                       if (urb->status == -EINPROGRESS)
+                               urb->status = 0;
+
+                       qtd = clean_this_qtd(qtd);
+                       isp1760_urb_done(priv, urb, urb->status);
+
+               } else {
+                       /* next QTD of this URB */
+
+                       qtd = clean_this_qtd(qtd);
+                       BUG_ON(!qtd);
+               }
+
+               if (qtd)
+                       enqueue_an_ATL_packet(usb_hcd, qh, qtd);
+
+               skip_map = isp1760_readl(usb_hcd->regs +
+                               HC_ATL_PTD_SKIPMAP_REG);
+       }
+}
+
+static void do_intl_int(struct usb_hcd *usb_hcd)
+{
+       struct isp1760_hcd *priv = hcd_to_priv(usb_hcd);
+       u32 done_map, skip_map;
+       struct ptd ptd;
+       struct urb *urb = NULL;
+       u32 int_regs;
+       u32 int_regs_base;
+       u32 payload;
+       u32 length;
+       u32 or_map;
+       int error;
+       u32 queue_entry;
+       struct isp1760_qtd *qtd;
+       struct isp1760_qh *qh;
+
+       done_map = isp1760_readl(usb_hcd->regs +
+                       HC_INT_PTD_DONEMAP_REG);
+       skip_map = isp1760_readl(usb_hcd->regs +
+                       HC_INT_PTD_SKIPMAP_REG);
+
+       or_map = isp1760_readl(usb_hcd->regs + HC_INT_IRQ_MASK_OR_REG);
+       or_map &= ~done_map;
+       isp1760_writel(or_map, usb_hcd->regs + HC_INT_IRQ_MASK_OR_REG);
+
+       int_regs_base = INT_REGS_OFFSET;
+
+       while (done_map) {
+               u32 dw1;
+               u32 dw3;
+
+               queue_entry = __ffs(done_map);
+               done_map &= ~(1 << queue_entry);
+               skip_map |= 1 << queue_entry;
+
+               int_regs = int_regs_base + queue_entry * sizeof(struct ptd);
+               urb = priv->int_ints[queue_entry].urb;
+               qtd = priv->int_ints[queue_entry].qtd;
+               qh = priv->int_ints[queue_entry].qh;
+               payload = priv->int_ints[queue_entry].payload;
+
+               if (!qh) {
+                       printk(KERN_ERR "(INT) qh is 0\n");
+                       continue;
+               }
+
+               priv_read_copy(priv, (u32 *)&ptd, usb_hcd->regs + int_regs,
+                               int_regs, sizeof(ptd));
+               dw1 = le32_to_cpu(ptd.dw1);
+               dw3 = le32_to_cpu(ptd.dw3);
+               check_int_err_status(le32_to_cpu(ptd.dw4));
+
+               error = check_error(&ptd);
+               if (error) {
+#if 0
+                       printk(KERN_ERR "Error in %s().\n", __func__);
+                       printk(KERN_ERR "IN dw0: %08x dw1: %08x dw2: %08x "
+                                       "dw3: %08x dw4: %08x dw5: %08x dw6: "
+                                       "%08x dw7: %08x\n",
+                                       ptd.dw0, ptd.dw1, ptd.dw2, ptd.dw3,
+                                       ptd.dw4, ptd.dw5, ptd.dw6, ptd.dw7);
+#endif
+                       urb->status = -EPIPE;
+                       priv->int_ints[queue_entry].qh->toggle = 0;
+                       priv->int_ints[queue_entry].qh->ping = 0;
+
+               } else {
+                       priv->int_ints[queue_entry].qh->toggle =
+                               dw3 & (1 << 25);
+                       priv->int_ints[queue_entry].qh->ping = dw3 & (1 << 26);
+               }
+
+               if (urb->dev->speed != USB_SPEED_HIGH)
+                       length = PTD_XFERRED_LENGTH_LO(dw3);
+               else
+                       length = PTD_XFERRED_LENGTH(dw3);
+
+               if (length) {
+                       switch (DW1_GET_PID(dw1)) {
+                       case IN_PID:
+                               priv_read_copy(priv,
+                                       priv->int_ints[queue_entry].data_buffer,
+                                       usb_hcd->regs + payload , payload,
+                                       length);
+                       case OUT_PID:
+
+                               urb->actual_length += length;
+
+                       case SETUP_PID:
+                               break;
+                       }
+               }
+
+               priv->int_ints[queue_entry].data_buffer = NULL;
+               priv->int_ints[queue_entry].urb = NULL;
+               priv->int_ints[queue_entry].qtd = NULL;
+               priv->int_ints[queue_entry].qh = NULL;
+
+               isp1760_writel(skip_map, usb_hcd->regs +
+                               HC_INT_PTD_SKIPMAP_REG);
+               free_mem(priv, payload);
+
+               if (urb->status == -EPIPE) {
+                       /* HALT received */
+
+                        qtd = clean_up_qtdlist(qtd);
+                        isp1760_urb_done(priv, urb, urb->status);
+
+               } else if (qtd->status & URB_COMPLETE_NOTIFY) {
+
+                       if (urb->status == -EINPROGRESS)
+                               urb->status = 0;
+
+                       qtd = clean_this_qtd(qtd);
+                       isp1760_urb_done(priv, urb, urb->status);
+
+               } else {
+                       /* next QTD of this URB */
+
+                       qtd = clean_this_qtd(qtd);
+                       BUG_ON(!qtd);
+               }
+
+               if (qtd)
+                       enqueue_an_INT_packet(usb_hcd, qh, qtd);
+
+               skip_map = isp1760_readl(usb_hcd->regs +
+                               HC_INT_PTD_SKIPMAP_REG);
+       }
+}
+
+#define max_packet(wMaxPacketSize) ((wMaxPacketSize) & 0x07ff)
+static struct isp1760_qh *qh_make(struct isp1760_hcd *priv, struct urb *urb,
+               gfp_t flags)
+{
+       struct isp1760_qh *qh;
+       int is_input, type;
+
+       qh = isp1760_qh_alloc(priv, flags);
+       if (!qh)
+               return qh;
+
+       /*
+        * init endpoint/device data for this QH
+        */
+       is_input = usb_pipein(urb->pipe);
+       type = usb_pipetype(urb->pipe);
+
+       if (type == PIPE_INTERRUPT) {
+
+               if (urb->dev->speed == USB_SPEED_HIGH) {
+
+                       qh->period = urb->interval >> 3;
+                       if (qh->period == 0 && urb->interval != 1) {
+                               /* NOTE interval 2 or 4 uframes could work.
+                                * But interval 1 scheduling is simpler, and
+                                * includes high bandwidth.
+                                */
+                               printk(KERN_ERR "intr period %d uframes, NYET!",
+                                               urb->interval);
+                               qh_destroy(qh);
+                               return NULL;
+                       }
+               } else {
+                       qh->period = urb->interval;
+               }
+       }
+
+       /* support for tt scheduling, and access to toggles */
+       qh->dev = urb->dev;
+
+       if (!usb_pipecontrol(urb->pipe))
+               usb_settoggle(urb->dev, usb_pipeendpoint(urb->pipe), !is_input,
+                               1);
+       return qh;
+}
+
+/*
+ * For control/bulk/interrupt, return QH with these TDs appended.
+ * Allocates and initializes the QH if necessary.
+ * Returns null if it can't allocate a QH it needs to.
+ * If the QH has TDs (urbs) already, that's great.
+ */
+static struct isp1760_qh *qh_append_tds(struct isp1760_hcd *priv,
+               struct urb *urb, struct list_head *qtd_list, int epnum,
+               void **ptr)
+{
+       struct isp1760_qh *qh;
+       struct isp1760_qtd *qtd;
+       struct isp1760_qtd *prev_qtd;
+
+       qh = (struct isp1760_qh *)*ptr;
+       if (!qh) {
+               /* can't sleep here, we have priv->lock... */
+               qh = qh_make(priv, urb, GFP_ATOMIC);
+               if (!qh)
+                       return qh;
+               *ptr = qh;
+       }
+
+       qtd = list_entry(qtd_list->next, struct isp1760_qtd,
+                       qtd_list);
+       if (!list_empty(&qh->qtd_list))
+               prev_qtd = list_entry(qh->qtd_list.prev,
+                               struct isp1760_qtd, qtd_list);
+       else
+               prev_qtd = NULL;
+
+       list_splice(qtd_list, qh->qtd_list.prev);
+       if (prev_qtd) {
+               BUG_ON(prev_qtd->hw_next);
+               prev_qtd->hw_next = qtd;
+       }
+
+       urb->hcpriv = qh;
+       return qh;
+}
+
+static void qtd_list_free(struct isp1760_hcd *priv, struct urb *urb,
+               struct list_head *qtd_list)
+{
+       struct list_head *entry, *temp;
+
+       list_for_each_safe(entry, temp, qtd_list) {
+               struct isp1760_qtd      *qtd;
+
+               qtd = list_entry(entry, struct isp1760_qtd, qtd_list);
+               list_del(&qtd->qtd_list);
+               isp1760_qtd_free(qtd);
+       }
+}
+
+static int isp1760_prepare_enqueue(struct isp1760_hcd *priv, struct urb *urb,
+               struct list_head *qtd_list, gfp_t mem_flags, packet_enqueue *p)
+{
+       struct isp1760_qtd         *qtd;
+       int                     epnum;
+       unsigned long           flags;
+       struct isp1760_qh          *qh = NULL;
+       int                     rc;
+       int qh_busy;
+
+       qtd = list_entry(qtd_list->next, struct isp1760_qtd, qtd_list);
+       epnum = urb->ep->desc.bEndpointAddress;
+
+       spin_lock_irqsave(&priv->lock, flags);
+       if (!test_bit(HCD_FLAG_HW_ACCESSIBLE, &priv_to_hcd(priv)->flags)) {
+               rc = -ESHUTDOWN;
+               goto done;
+       }
+       rc = usb_hcd_link_urb_to_ep(priv_to_hcd(priv), urb);
+       if (rc)
+               goto done;
+
+       qh = urb->ep->hcpriv;
+       if (qh)
+               qh_busy = !list_empty(&qh->qtd_list);
+       else
+               qh_busy = 0;
+
+       qh = qh_append_tds(priv, urb, qtd_list, epnum, &urb->ep->hcpriv);
+       if (!qh) {
+               usb_hcd_unlink_urb_from_ep(priv_to_hcd(priv), urb);
+               rc = -ENOMEM;
+               goto done;
+       }
+
+       if (!qh_busy)
+               p(priv_to_hcd(priv), qh, qtd);
+
+done:
+       spin_unlock_irqrestore(&priv->lock, flags);
+       if (!qh)
+               qtd_list_free(priv, urb, qtd_list);
+       return rc;
+}
+
+static struct isp1760_qtd *isp1760_qtd_alloc(struct isp1760_hcd *priv,
+               gfp_t flags)
+{
+       struct isp1760_qtd *qtd;
+
+       qtd = kmem_cache_zalloc(qtd_cachep, flags);
+       if (qtd)
+               INIT_LIST_HEAD(&qtd->qtd_list);
+
+       return qtd;
+}
+
+/*
+ * create a list of filled qtds for this URB; won't link into qh.
+ */
+static struct list_head *qh_urb_transaction(struct isp1760_hcd *priv,
+               struct urb *urb, struct list_head *head, gfp_t flags)
+{
+       struct isp1760_qtd *qtd, *qtd_prev;
+       void *buf;
+       int len, maxpacket;
+       int is_input;
+       u32 token;
+
+       /*
+        * URBs map to sequences of QTDs:  one logical transaction
+        */
+       qtd = isp1760_qtd_alloc(priv, flags);
+       if (!qtd)
+               return NULL;
+
+       list_add_tail(&qtd->qtd_list, head);
+       qtd->urb = urb;
+       urb->status = -EINPROGRESS;
+
+       token = 0;
+       /* for split transactions, SplitXState initialized to zero */
+
+       len = urb->transfer_buffer_length;
+       is_input = usb_pipein(urb->pipe);
+       if (usb_pipecontrol(urb->pipe)) {
+               /* SETUP pid */
+               qtd_fill(qtd, urb->setup_packet,
+                               sizeof(struct usb_ctrlrequest),
+                               token | SETUP_PID);
+
+               /* ... and always at least one more pid */
+               token ^= DATA_TOGGLE;
+               qtd_prev = qtd;
+               qtd = isp1760_qtd_alloc(priv, flags);
+               if (!qtd)
+                       goto cleanup;
+               qtd->urb = urb;
+               qtd_prev->hw_next = qtd;
+               list_add_tail(&qtd->qtd_list, head);
+
+               /* for zero length DATA stages, STATUS is always IN */
+               if (len == 0)
+                       token |= IN_PID;
+       }
+
+       /*
+        * data transfer stage:  buffer setup
+        */
+       buf = urb->transfer_buffer;
+
+       if (is_input)
+               token |= IN_PID;
+       else
+               token |= OUT_PID;
+
+       maxpacket = max_packet(usb_maxpacket(urb->dev, urb->pipe, !is_input));
+
+       /*
+        * buffer gets wrapped in one or more qtds;
+        * last one may be "short" (including zero len)
+        * and may serve as a control status ack
+        */
+       for (;;) {
+               int this_qtd_len;
+
+               if (!buf && len) {
+                       /* XXX This looks like usb storage / SCSI bug */
+                       printk(KERN_ERR "buf is null, dma is %08lx len is %d\n",
+                                       (long unsigned)urb->transfer_dma, len);
+                       WARN_ON(1);
+               }
+
+               this_qtd_len = qtd_fill(qtd, buf, len, token);
+               len -= this_qtd_len;
+               buf += this_qtd_len;
+
+               /* qh makes control packets use qtd toggle; maybe switch it */
+               if ((maxpacket & (this_qtd_len + (maxpacket - 1))) == 0)
+                       token ^= DATA_TOGGLE;
+
+               if (len <= 0)
+                       break;
+
+               qtd_prev = qtd;
+               qtd = isp1760_qtd_alloc(priv, flags);
+               if (!qtd)
+                       goto cleanup;
+               qtd->urb = urb;
+               qtd_prev->hw_next = qtd;
+               list_add_tail(&qtd->qtd_list, head);
+       }
+
+       /*
+        * 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;
+                       /* "in" <--> "out"  */
+                       token ^= IN_PID;
+                       /* force DATA1 */
+                       token |= DATA_TOGGLE;
+               } else if (usb_pipebulk(urb->pipe)
+                               && (urb->transfer_flags & URB_ZERO_PACKET)
+                               && !(urb->transfer_buffer_length % maxpacket)) {
+                       one_more = 1;
+               }
+               if (one_more) {
+                       qtd_prev = qtd;
+                       qtd = isp1760_qtd_alloc(priv, flags);
+                       if (!qtd)
+                               goto cleanup;
+                       qtd->urb = urb;
+                       qtd_prev->hw_next = qtd;
+                       list_add_tail(&qtd->qtd_list, head);
+
+                       /* never any data in such packets */
+                       qtd_fill(qtd, NULL, 0, token);
+               }
+       }
+
+       qtd->status = URB_COMPLETE_NOTIFY;
+       return head;
+
+cleanup:
+       qtd_list_free(priv, urb, head);
+       return NULL;
+}
+
+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 qtd_list;
+       packet_enqueue *pe;
+
+       INIT_LIST_HEAD(&qtd_list);
+
+       switch (usb_pipetype(urb->pipe)) {
+       case PIPE_CONTROL:
+       case PIPE_BULK:
+
+               if (!qh_urb_transaction(priv, urb, &qtd_list, mem_flags))
+                       return -ENOMEM;
+               pe =  enqueue_an_ATL_packet;
+               break;
+
+       case PIPE_INTERRUPT:
+               if (!qh_urb_transaction(priv, urb, &qtd_list, mem_flags))
+                       return -ENOMEM;
+               pe = enqueue_an_INT_packet;
+               break;
+
+       case PIPE_ISOCHRONOUS:
+               printk(KERN_ERR "PIPE_ISOCHRONOUS ain't supported\n");
+       default:
+               return -EPIPE;
+       }
+
+       isp1760_prepare_enqueue(priv, urb, &qtd_list, mem_flags, pe);
+       return 0;
+}
+
+static int isp1760_urb_dequeue(struct usb_hcd *hcd, struct urb *urb,
+               int status)
+{
+       struct isp1760_hcd *priv = hcd_to_priv(hcd);
+       struct inter_packet_info *ints;
+       u32 i;
+       u32 reg_base, or_reg, skip_reg;
+       int flags;
+       struct ptd ptd;
+
+       switch (usb_pipetype(urb->pipe)) {
+       case PIPE_ISOCHRONOUS:
+               return -EPIPE;
+               break;
+
+       case PIPE_INTERRUPT:
+               ints = priv->int_ints;
+               reg_base = INT_REGS_OFFSET;
+               or_reg = HC_INT_IRQ_MASK_OR_REG;
+               skip_reg = HC_INT_PTD_SKIPMAP_REG;
+               break;
+
+       default:
+               ints = priv->atl_ints;
+               reg_base = ATL_REGS_OFFSET;
+               or_reg = HC_ATL_IRQ_MASK_OR_REG;
+               skip_reg = HC_ATL_PTD_SKIPMAP_REG;
+               break;
+       }
+
+       memset(&ptd, 0, sizeof(ptd));
+       spin_lock_irqsave(&priv->lock, flags);
+
+       for (i = 0; i < 32; i++) {
+               if (ints->urb == urb) {
+                       u32 skip_map;
+                       u32 or_map;
+                       struct isp1760_qtd *qtd;
+
+                       skip_map = isp1760_readl(hcd->regs + skip_reg);
+                       skip_map |= 1 << i;
+                       isp1760_writel(skip_map, hcd->regs + skip_reg);
+
+                       or_map = isp1760_readl(hcd->regs + or_reg);
+                       or_map &= ~(1 << i);
+                       isp1760_writel(or_map, hcd->regs + or_reg);
+
+                       priv_write_copy(priv, (u32 *)&ptd, hcd->regs + reg_base
+                                       + i * sizeof(ptd), sizeof(ptd));
+                       qtd = ints->qtd;
+
+                       clean_up_qtdlist(qtd);
+
+                       free_mem(priv, ints->payload);
+
+                       ints->urb = NULL;
+                       ints->qh = NULL;
+                       ints->qtd = NULL;
+                       ints->data_buffer = NULL;
+                       ints->payload = 0;
+
+                       isp1760_urb_done(priv, urb, status);
+                       break;
+               }
+               ints++;
+       }
+
+       spin_unlock_irqrestore(&priv->lock, flags);
+       return 0;
+}
+
+static irqreturn_t isp1760_irq(struct usb_hcd *usb_hcd)
+{
+       struct isp1760_hcd *priv = hcd_to_priv(usb_hcd);
+       u32 imask;
+       irqreturn_t irqret = IRQ_NONE;
+
+       spin_lock(&priv->lock);
+
+       if (!(usb_hcd->state & HC_STATE_RUNNING))
+               goto leave;
+
+       imask = isp1760_readl(usb_hcd->regs + HC_INTERRUPT_REG);
+       if (unlikely(!imask))
+               goto leave;
+
+       isp1760_writel(imask, usb_hcd->regs + HC_INTERRUPT_REG);
+       if (imask & HC_ATL_INT)
+               do_atl_int(usb_hcd);
+
+       if (imask & HC_INTL_INT)
+               do_intl_int(usb_hcd);
+
+       irqret = IRQ_HANDLED;
+leave:
+       spin_unlock(&priv->lock);
+       return irqret;
+}
+
+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;
+
+       /* if !USB_SUSPEND, root hub timers won't get shut down ... */
+       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);
+       temp = isp1760_readl(hcd->regs + HC_PORTSC1);
+
+       if (temp & PORT_OWNER) {
+               if (temp & PORT_CSC) {
+                       temp &= ~PORT_CSC;
+                       isp1760_writel(temp, hcd->regs + HC_PORTSC1);
+                       goto done;
+               }
+       }
+
+       /*
+        * Return status information even for ports with OWNER set.
+        * Otherwise khubd wouldn't see the disconnect event when a
+        * 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;
+
+       /* two bitmaps:  ports removable, and usb 1.0 legacy PortPwrCtrlMask */
+       memset(&desc->bitmap[0], 0, temp);
+       memset(&desc->bitmap[temp], 0xff, temp);
+
+       /* per-port overcurrent reporting */
+       temp = 0x0008;
+       if (HCS_PPC(priv->hcs_params))
+               /* per-port power control */
+               temp |= 0x0001;
+       else
+               /* no power switching */
+               temp |= 0x0002;
+       desc->wHubCharacteristics = cpu_to_le16(temp);
+}
+
+#define        PORT_WAKE_BITS  (PORT_WKOC_E|PORT_WKDISC_E|PORT_WKCONN_E)
+
+static int check_reset_complete(struct isp1760_hcd *priv, int index,
+               u32 __iomem *status_reg, int port_status)
+{
+       if (!(port_status & PORT_CONNECT))
+               return port_status;
+
+       /* if reset finished and it's still not enabled -- handoff */
+       if (!(port_status & PORT_PE)) {
+
+               printk(KERN_ERR "port %d full speed --> companion\n",
+                       index + 1);
+
+               port_status |= PORT_OWNER;
+               port_status &= ~PORT_RWC_BITS;
+               isp1760_writel(port_status, status_reg);
+
+       } else
+               printk(KERN_ERR "port %d high speed\n", index + 1);
+
+       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 __iomem *status_reg = hcd->regs + HC_PORTSC1;
+       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--;
+               temp = isp1760_readl(status_reg);
+
+               /*
+                * Even if OWNER is set, so the port is owned by the
+                * companion controller, khubd needs to be able to clear
+                * the port-change status bits (especially
+                * USB_PORT_FEAT_C_CONNECTION).
+                */
+
+               switch (wValue) {
+               case USB_PORT_FEAT_ENABLE:
+                       isp1760_writel(temp & ~PORT_PE, status_reg);
+                       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);
+                               isp1760_writel(temp | PORT_RESUME,
+                                               status_reg);
+                               priv->reset_done = jiffies +
+                                       msecs_to_jiffies(20);
+                       }
+                       break;
+               case USB_PORT_FEAT_C_SUSPEND:
+                       /* we auto-clear this feature */
+                       break;
+               case USB_PORT_FEAT_POWER:
+                       if (HCS_PPC(priv->hcs_params))
+                               isp1760_writel(temp & ~PORT_POWER, status_reg);
+                       break;
+               case USB_PORT_FEAT_C_CONNECTION:
+                       isp1760_writel(temp | PORT_CSC,
+                                       status_reg);
+                       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_readl(hcd->regs + HC_USBCMD);
+               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;
+               temp = isp1760_readl(status_reg);
+
+               /* wPortChange bits */
+               if (temp & PORT_CSC)
+                       status |= 1 << USB_PORT_FEAT_C_CONNECTION;
+
+
+               /* whoever resumes must GetPortStatus to complete it!! */
+               if (temp & PORT_RESUME) {
+                       printk(KERN_ERR "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(&priv_to_hcd(priv)->rh_timer,
+                                               priv->reset_done);
+                       }
+
+                       /* resume completed? */
+                       else if (time_after_eq(jiffies,
+                                       priv->reset_done)) {
+                               status |= 1 << USB_PORT_FEAT_C_SUSPEND;
+                               priv->reset_done = 0;
+
+                               /* stop resume signaling */
+                               temp = isp1760_readl(status_reg);
+                               isp1760_writel(
+                                       temp & ~(PORT_RWC_BITS | PORT_RESUME),
+                                       status_reg);
+                               retval = handshake(priv, status_reg,
+                                          PORT_RESUME, 0, 2000 /* 2msec */);
+                               if (retval != 0) {
+                                       isp1760_err(priv,
+                                               "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)) {
+                       status |= 1 << USB_PORT_FEAT_C_RESET;
+                       priv->reset_done = 0;
+
+                       /* force reset to complete */
+                       isp1760_writel(temp & ~PORT_RESET,
+                                       status_reg);
+                       /* REVISIT:  some hardware needs 550+ usec to clear
+                        * this bit; seems too long to spin routinely...
+                        */
+                       retval = handshake(priv, status_reg,
+                                       PORT_RESET, 0, 750);
+                       if (retval != 0) {
+                               isp1760_err(priv, "port %d reset error %d\n",
+                                               wIndex + 1, retval);
+                               goto error;
+                       }
+
+                       /* see what we found out */
+                       temp = check_reset_complete(priv, wIndex, status_reg,
+                                       isp1760_readl(status_reg));
+               }
+               /*
+                * Even if OWNER is set, there's no harm letting khubd
+                * see the wPortStatus values (they should all be 0 except
+                * for PORT_POWER anyway).
+                */
+
+               if (temp & PORT_OWNER)
+                       printk(KERN_ERR "Warning: PORT_OWNER is set\n");
+
+               if (temp & PORT_CONNECT) {
+                       status |= 1 << USB_PORT_FEAT_CONNECTION;
+                       /* status may be from integrated TT */
+                       status |= ehci_port_speed(priv, temp);
+               }
+               if (temp & PORT_PE)
+                       status |= 1 << USB_PORT_FEAT_ENABLE;
+               if (temp & (PORT_SUSPEND|PORT_RESUME))
+                       status |= 1 << USB_PORT_FEAT_SUSPEND;
+               if (temp & PORT_RESET)
+                       status |= 1 << USB_PORT_FEAT_RESET;
+               if (temp & PORT_POWER)
+                       status |= 1 << USB_PORT_FEAT_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:
+               selector = wIndex >> 8;
+               wIndex &= 0xff;
+               if (!wIndex || wIndex > ports)
+                       goto error;
+               wIndex--;
+               temp = isp1760_readl(status_reg);
+               if (temp & PORT_OWNER)
+                       break;
+
+/*             temp &= ~PORT_RWC_BITS; */
+               switch (wValue) {
+               case USB_PORT_FEAT_ENABLE:
+                       isp1760_writel(temp | PORT_PE, status_reg);
+                       break;
+
+               case USB_PORT_FEAT_SUSPEND:
+                       if ((temp & PORT_PE) == 0
+                                       || (temp & PORT_RESET) != 0)
+                               goto error;
+
+                       isp1760_writel(temp | PORT_SUSPEND, status_reg);
+                       break;
+               case USB_PORT_FEAT_POWER:
+                       if (HCS_PPC(priv->hcs_params))
+                               isp1760_writel(temp | PORT_POWER,
+                                               status_reg);
+                       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);
+                       }
+                       isp1760_writel(temp, status_reg);
+                       break;
+               default:
+                       goto error;
+               }
+               isp1760_readl(hcd->regs + HC_USBCMD);
+               break;
+
+       default:
+error:
+               /* "stall" on error */
+               retval = -EPIPE;
+       }
+       spin_unlock_irqrestore(&priv->lock, flags);
+       return retval;
+}
+
+static void isp1760_endpoint_disable(struct usb_hcd *usb_hcd,
+               struct usb_host_endpoint *ep)
+{
+       struct isp1760_hcd *priv = hcd_to_priv(usb_hcd);
+       struct isp1760_qh *qh;
+       struct isp1760_qtd *qtd;
+       u32 flags;
+
+       spin_lock_irqsave(&priv->lock, flags);
+       qh = ep->hcpriv;
+       if (!qh)
+               goto out;
+
+       ep->hcpriv = NULL;
+       do {
+               /* more than entry might get removed */
+               if (list_empty(&qh->qtd_list))
+                       break;
+
+               qtd = list_first_entry(&qh->qtd_list, struct isp1760_qtd,
+                               qtd_list);
+
+               if (qtd->status & URB_ENQUEUED) {
+
+                       spin_unlock_irqrestore(&priv->lock, flags);
+                       isp1760_urb_dequeue(usb_hcd, qtd->urb, -ECONNRESET);
+                       spin_lock_irqsave(&priv->lock, flags);
+               } else {
+                       struct urb *urb;
+
+                       urb = qtd->urb;
+                       clean_up_qtdlist(qtd);
+                       isp1760_urb_done(priv, urb, -ECONNRESET);
+               }
+       } while (1);
+
+       qh_destroy(qh);
+       /* remove requests and leak them.
+        * ATL are pretty fast done, INT could take a while...
+        * The latter shoule be removed
+        */
+out:
+       spin_unlock_irqrestore(&priv->lock, flags);
+}
+
+static int isp1760_get_frame(struct usb_hcd *hcd)
+{
+       struct isp1760_hcd *priv = hcd_to_priv(hcd);
+       u32 fr;
+
+       fr = isp1760_readl(hcd->regs + HC_FRINDEX);
+       return (fr >> 3) % priv->periodic_size;
+}
+
+static void isp1760_stop(struct usb_hcd *hcd)
+{
+       struct isp1760_hcd *priv = hcd_to_priv(hcd);
+
+       isp1760_hub_control(hcd, ClearPortFeature, USB_PORT_FEAT_POWER, 1,
+                       NULL, 0);
+       mdelay(20);
+
+       spin_lock_irq(&priv->lock);
+       ehci_reset(priv);
+       /* Disable IRQ */
+       isp1760_writel(HW_DATA_BUS_32BIT, hcd->regs + HC_HW_MODE_CTRL);
+       spin_unlock_irq(&priv->lock);
+
+       isp1760_writel(0, hcd->regs + HC_CONFIGFLAG);
+}
+
+static void isp1760_shutdown(struct usb_hcd *hcd)
+{
+       u32 command;
+
+       isp1760_stop(hcd);
+       isp1760_writel(HW_DATA_BUS_32BIT, hcd->regs + HC_HW_MODE_CTRL);
+
+       command = isp1760_readl(hcd->regs + HC_USBCMD);
+       command &= ~CMD_RUN;
+       isp1760_writel(command, hcd->regs + HC_USBCMD);
+}
+
+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,
+};
+
+int __init init_kmem_once(void)
+{
+       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;
+}
+
+void deinit_kmem_cache(void)
+{
+       kmem_cache_destroy(qtd_cachep);
+       kmem_cache_destroy(qh_cachep);
+}
+
+struct usb_hcd *isp1760_register(u64 res_start, u64 res_len, int irq,
+               u64 irqflags, struct device *dev, const char *busname)
+{
+       struct usb_hcd *hcd;
+       struct isp1760_hcd *priv;
+       int ret;
+
+       if (usb_disabled())
+               return ERR_PTR(-ENODEV);
+
+       /* prevent usb-core allocating DMA pages */
+       dev->dma_mask = NULL;
+
+       hcd = usb_create_hcd(&isp1760_hc_driver, dev, dev->bus_id);
+       if (!hcd)
+               return ERR_PTR(-ENOMEM);
+
+       priv = hcd_to_priv(hcd);
+       init_memory(priv);
+       hcd->regs = ioremap(res_start, res_len);
+       if (!hcd->regs) {
+               ret = -EIO;
+               goto err_put;
+       }
+
+       ret = usb_add_hcd(hcd, irq, irqflags);
+       if (ret)
+               goto err_unmap;
+
+       hcd->irq = irq;
+       hcd->rsrc_start = res_start;
+       hcd->rsrc_len = res_len;
+
+       return hcd;
+
+err_unmap:
+        iounmap(hcd->regs);
+
+err_put:
+        usb_put_hcd(hcd);
+
+        return ERR_PTR(ret);
+}
+
+MODULE_DESCRIPTION("Driver for the ISP1760 USB-controller from NXP");
+MODULE_AUTHOR("Sebastian Siewior <bigeasy@linuxtronix.de>");
+MODULE_LICENSE("GPL v2");
diff --git a/drivers/usb/host/isp1760-hcd.h b/drivers/usb/host/isp1760-hcd.h
new file mode 100644 (file)
index 0000000..3d86d0f
--- /dev/null
@@ -0,0 +1,206 @@
+#ifndef _ISP1760_HCD_H_
+#define _ISP1760_HCD_H_
+
+/* exports for if */
+struct usb_hcd *isp1760_register(u64 res_start, u64 res_len, int irq,
+               u64 irqflags, struct device *dev, const char *busname);
+int init_kmem_once(void);
+void deinit_kmem_cache(void);
+
+/* EHCI capability registers */
+#define HC_CAPLENGTH           0x00
+#define HC_HCSPARAMS           0x04
+#define HC_HCCPARAMS           0x08
+
+/* EHCI operational registers */
+#define HC_USBCMD              0x20
+#define HC_USBSTS              0x24
+#define HC_FRINDEX             0x2c
+#define HC_CONFIGFLAG          0x60
+#define HC_PORTSC1             0x64
+#define HC_ISO_PTD_DONEMAP_REG 0x130
+#define HC_ISO_PTD_SKIPMAP_REG 0x134
+#define HC_ISO_PTD_LASTPTD_REG 0x138
+#define HC_INT_PTD_DONEMAP_REG 0x140
+#define HC_INT_PTD_SKIPMAP_REG 0x144
+#define HC_INT_PTD_LASTPTD_REG 0x148
+#define HC_ATL_PTD_DONEMAP_REG 0x150
+#define HC_ATL_PTD_SKIPMAP_REG 0x154
+#define HC_ATL_PTD_LASTPTD_REG 0x158
+
+/* Configuration Register */
+#define HC_HW_MODE_CTRL                0x300
+#define ALL_ATX_RESET          (1 << 31)
+#define HW_DATA_BUS_32BIT      (1 << 8)
+#define HW_DACK_POL_HIGH       (1 << 6)
+#define HW_DREQ_POL_HIGH       (1 << 5)
+#define HW_INTR_HIGH_ACT       (1 << 2)
+#define HW_INTR_EDGE_TRIG      (1 << 1)
+#define HW_GLOBAL_INTR_EN      (1 << 0)
+
+#define HC_CHIP_ID_REG         0x304
+#define HC_SCRATCH_REG         0x308
+
+#define HC_RESET_REG           0x30c
+#define SW_RESET_RESET_HC      (1 << 1)
+#define SW_RESET_RESET_ALL     (1 << 0)
+
+#define HC_BUFFER_STATUS_REG   0x334
+#define ATL_BUFFER             0x1
+#define INT_BUFFER             0x2
+#define ISO_BUFFER             0x4
+#define BUFFER_MAP             0x7
+
+#define HC_MEMORY_REG          0x33c
+#define HC_PORT1_CTRL          0x374
+#define PORT1_POWER            (3 << 3)
+#define PORT1_INIT1            (1 << 7)
+#define PORT1_INIT2            (1 << 23)
+
+/* Interrupt Register */
+#define HC_INTERRUPT_REG       0x310
+
+#define HC_INTERRUPT_ENABLE    0x314
+#define INTERRUPT_ENABLE_MASK  (HC_INTL_INT | HC_ATL_INT | HC_EOT_INT)
+#define FINAL_HW_CONFIG        (HW_GLOBAL_INTR_EN | HW_DATA_BUS_32BIT)
+
+#define HC_ISO_INT             (1 << 9)
+#define HC_ATL_INT             (1 << 8)
+#define HC_INTL_INT            (1 << 7)
+#define HC_EOT_INT             (1 << 3)
+#define HC_SOT_INT             (1 << 1)
+
+#define HC_ISO_IRQ_MASK_OR_REG 0x318
+#define HC_INT_IRQ_MASK_OR_REG 0x31C
+#define HC_ATL_IRQ_MASK_OR_REG 0x320
+#define HC_ISO_IRQ_MASK_AND_REG        0x324
+#define HC_INT_IRQ_MASK_AND_REG        0x328
+#define HC_ATL_IRQ_MASK_AND_REG        0x32C
+
+/* Register sets */
+#define HC_BEGIN_OF_ATL                0x0c00
+#define HC_BEGIN_OF_INT                0x0800
+#define HC_BEGIN_OF_ISO                0x0400
+#define HC_BEGIN_OF_PAYLOAD    0x1000
+
+/* urb state*/
+#define DELETE_URB             (0x0008)
+#define NO_TRANSFER_ACTIVE     (0xffffffff)
+
+#define ATL_REGS_OFFSET                (0xc00)
+#define INT_REGS_OFFSET                (0x800)
+
+/* Philips Transfer Descriptor (PTD) */
+struct ptd {
+       __le32 dw0;
+       __le32 dw1;
+       __le32 dw2;
+       __le32 dw3;
+       __le32 dw4;
+       __le32 dw5;
+       __le32 dw6;
+       __le32 dw7;
+};
+
+struct inter_packet_info {
+       void *data_buffer;
+       u32 payload;
+#define PTD_FIRE_NEXT          (1 << 0)
+#define PTD_URB_FINISHED       (1 << 1)
+       struct urb *urb;
+       struct isp1760_qh *qh;
+       struct isp1760_qtd *qtd;
+};
+
+
+typedef void (packet_enqueue)(struct usb_hcd *hcd, struct isp1760_qh *qh,
+               struct isp1760_qtd *qtd);
+
+#define isp1760_info(priv, fmt, args...) \
+       dev_info(priv_to_hcd(priv)->self.controller, fmt, ##args)
+
+#define isp1760_err(priv, fmt, args...) \
+       dev_err(priv_to_hcd(priv)->self.controller, fmt, ##args)
+
+/* chip memory management */
+struct memory_chunk {
+       unsigned int start;
+       unsigned int size;
+       unsigned int free;
+};
+
+/*
+ * 60kb divided in:
+ * - 32 blocks @ 256  bytes
+ * - 20 blocks @ 1024 bytes
+ * -  4 blocks @ 8192 bytes
+ */
+
+#define BLOCK_1_NUM 32
+#define BLOCK_2_NUM 20
+#define BLOCK_3_NUM 4
+
+#define BLOCK_1_SIZE 256
+#define BLOCK_2_SIZE 1024
+#define BLOCK_3_SIZE 8192
+#define BLOCKS (BLOCK_1_NUM + BLOCK_2_NUM + BLOCK_3_NUM)
+#define PAYLOAD_SIZE 0xf000
+
+/* I saw if some reloads if the pointer was negative */
+#define ISP1760_NULL_POINTER   (0x400)
+
+/* ATL */
+/* DW0 */
+#define PTD_VALID                      1
+#define PTD_LENGTH(x)                  (((u32) x) << 3)
+#define PTD_MAXPACKET(x)               (((u32) x) << 18)
+#define PTD_MULTI(x)                   (((u32) x) << 29)
+#define PTD_ENDPOINT(x)                        (((u32) x) << 31)
+/* DW1 */
+#define PTD_DEVICE_ADDR(x)             (((u32) x) << 3)
+#define PTD_PID_TOKEN(x)               (((u32) x) << 10)
+#define PTD_TRANS_BULK                 ((u32) 2 << 12)
+#define PTD_TRANS_INT                  ((u32) 3 << 12)
+#define PTD_TRANS_SPLIT                        ((u32) 1 << 14)
+#define PTD_SE_USB_LOSPEED             ((u32) 2 << 16)
+#define PTD_PORT_NUM(x)                        (((u32) x) << 18)
+#define PTD_HUB_NUM(x)                 (((u32) x) << 25)
+#define PTD_PING(x)                    (((u32) x) << 26)
+/* DW2 */
+#define PTD_RL_CNT(x)                  (((u32) x) << 25)
+#define PTD_DATA_START_ADDR(x)         (((u32) x) << 8)
+#define BASE_ADDR                      0x1000
+/* DW3 */
+#define PTD_CERR(x)                    (((u32) x) << 23)
+#define PTD_NAC_CNT(x)                 (((u32) x) << 19)
+#define PTD_ACTIVE                     ((u32) 1 << 31)
+#define PTD_DATA_TOGGLE(x)             (((u32) x) << 25)
+
+#define DW3_HALT_BIT                   (1 << 30)
+#define DW3_ERROR_BIT                  (1 << 28)
+#define DW3_QTD_ACTIVE                 (1 << 31)
+
+#define INT_UNDERRUN                   (1 << 2)
+#define INT_BABBLE                     (1 << 1)
+#define INT_EXACT                      (1 << 0)
+
+#define DW1_GET_PID(x)                 (((x) >> 10) & 0x3)
+#define PTD_XFERRED_LENGTH(x)          ((x) & 0x7fff)
+#define PTD_XFERRED_LENGTH_LO(x)       ((x) & 0x7ff)
+
+#define SETUP_PID      (2)
+#define IN_PID         (1)
+#define OUT_PID                (0)
+#define GET_QTD_TOKEN_TYPE(x)  ((x) & 0x3)
+
+#define DATA_TOGGLE            (1 << 31)
+#define GET_DATA_TOGGLE(x)     ((x) >> 31)
+
+/* Errata 1 */
+#define RL_COUNTER     (0)
+#define NAK_COUNTER    (0)
+#define ERR_COUNTER    (2)
+
+#define HC_ATL_PL_SIZE (8192)
+
+#endif
diff --git a/drivers/usb/host/isp1760-if.c b/drivers/usb/host/isp1760-if.c
new file mode 100644 (file)
index 0000000..73fb2a3
--- /dev/null
@@ -0,0 +1,298 @@
+/*
+ * Glue code for the ISP1760 driver and bus
+ * Currently there is support for
+ * - OpenFirmware
+ * - PCI
+ *
+ * (c) 2007 Sebastian Siewior <bigeasy@linutronix.de>
+ *
+ */
+
+#include <linux/usb.h>
+#include <linux/io.h>
+
+#include "../core/hcd.h"
+#include "isp1760-hcd.h"
+
+#ifdef CONFIG_USB_ISP1760_OF
+#include <linux/of.h>
+#include <linux/of_platform.h>
+#endif
+
+#ifdef CONFIG_USB_ISP1760_PCI
+#include <linux/pci.h>
+#endif
+
+#ifdef CONFIG_USB_ISP1760_OF
+static int of_isp1760_probe(struct of_device *dev,
+               const struct of_device_id *match)
+{
+       struct usb_hcd *hcd;
+       struct device_node *dp = dev->node;
+       struct resource *res;
+       struct resource memory;
+       struct of_irq oirq;
+       int virq;
+       u64 res_len;
+       int ret;
+
+       ret = of_address_to_resource(dp, 0, &memory);
+       if (ret)
+               return -ENXIO;
+
+       res = request_mem_region(memory.start, memory.end - memory.start + 1,
+                       dev->dev.bus_id);
+       if (!res)
+               return -EBUSY;
+
+       res_len = memory.end - memory.start + 1;
+
+       if (of_irq_map_one(dp, 0, &oirq)) {
+               ret = -ENODEV;
+               goto release_reg;
+       }
+
+       virq = irq_create_of_mapping(oirq.controller, oirq.specifier,
+                       oirq.size);
+
+       hcd = isp1760_register(memory.start, res_len, virq,
+               IRQF_SHARED | IRQF_DISABLED, &dev->dev, dev->dev.bus_id);
+       if (IS_ERR(hcd)) {
+               ret = PTR_ERR(hcd);
+               goto release_reg;
+       }
+
+       dev_set_drvdata(&dev->dev, hcd);
+       return ret;
+
+release_reg:
+       release_mem_region(memory.start, memory.end - memory.start + 1);
+       return ret;
+}
+
+static int of_isp1760_remove(struct of_device *dev)
+{
+       struct usb_hcd *hcd = dev_get_drvdata(&dev->dev);
+
+       dev_set_drvdata(&dev->dev, NULL);
+
+       usb_remove_hcd(hcd);
+       iounmap(hcd->regs);
+       release_mem_region(hcd->rsrc_start, hcd->rsrc_len);
+       usb_put_hcd(hcd);
+       return 0;
+}
+
+static struct of_device_id of_isp1760_match[] = {
+       {
+               .compatible = "nxp,usb-isp1760",
+       },
+       { },
+};
+MODULE_DEVICE_TABLE(of, of_isp1760_match);
+
+static struct of_platform_driver isp1760_of_driver = {
+       .name           = "nxp-isp1760",
+       .match_table    = of_isp1760_match,
+       .probe          = of_isp1760_probe,
+       .remove         = of_isp1760_remove,
+};
+#endif
+
+#ifdef CONFIG_USB_ISP1760_PCI
+static u32 nxp_pci_io_base;
+static u32 iolength;
+static u32 pci_mem_phy0;
+static u32 length;
+static u8 *chip_addr;
+static u8 *iobase;
+
+static int __devinit isp1761_pci_probe(struct pci_dev *dev,
+               const struct pci_device_id *id)
+{
+       u8 latency, limit;
+       __u32 reg_data;
+       int retry_count;
+       int length;
+       int status = 1;
+       struct usb_hcd *hcd;
+
+       if (usb_disabled())
+               return -ENODEV;
+
+       if (pci_enable_device(dev) < 0)
+               return -ENODEV;
+
+       if (!dev->irq)
+               return -ENODEV;
+
+       /* Grab the PLX PCI mem maped port start address we need  */
+       nxp_pci_io_base = pci_resource_start(dev, 0);
+       iolength = pci_resource_len(dev, 0);
+
+       if (!request_mem_region(nxp_pci_io_base, iolength, "ISP1761 IO MEM")) {
+               printk(KERN_ERR "request region #1\n");
+               return -EBUSY;
+       }
+
+       iobase = ioremap_nocache(nxp_pci_io_base, iolength);
+       if (!iobase) {
+               printk(KERN_ERR "ioremap #1\n");
+               release_mem_region(nxp_pci_io_base, iolength);
+               return -ENOMEM;
+       }
+       /* Grab the PLX PCI shared memory of the ISP 1761 we need  */
+       pci_mem_phy0 = pci_resource_start(dev, 3);
+       length = pci_resource_len(dev, 3);
+
+       if (length < 0xffff) {
+               printk(KERN_ERR "memory length for this resource is less than "
+                               "required\n");
+               release_mem_region(nxp_pci_io_base, iolength);
+               iounmap(iobase);
+               return  -ENOMEM;
+       }
+
+       if (!request_mem_region(pci_mem_phy0, length, "ISP-PCI")) {
+               printk(KERN_ERR "host controller already in use\n");
+               release_mem_region(nxp_pci_io_base, iolength);
+               iounmap(iobase);
+               return -EBUSY;
+       }
+
+       /* bad pci latencies can contribute to overruns */
+       pci_read_config_byte(dev, PCI_LATENCY_TIMER, &latency);
+       if (latency) {
+               pci_read_config_byte(dev, PCI_MAX_LAT, &limit);
+               if (limit && limit < latency)
+                       pci_write_config_byte(dev, PCI_LATENCY_TIMER, limit);
+       }
+
+       /* Try to check whether we can access Scratch Register of
+        * Host Controller or not. The initial PCI access is retried until
+        * local init for the PCI bridge is completed
+        */
+       retry_count = 20;
+       reg_data = 0;
+       while ((reg_data != 0xFACE) && retry_count) {
+               /*by default host is in 16bit mode, so
+                * io operations at this stage must be 16 bit
+                * */
+               writel(0xface, chip_addr + HC_SCRATCH_REG);
+               udelay(100);
+               reg_data = readl(chip_addr + HC_SCRATCH_REG);
+               retry_count--;
+       }
+
+       /* Host Controller presence is detected by writing to scratch register
+        * and reading back and checking the contents are same or not
+        */
+       if (reg_data != 0xFACE) {
+               err("scratch register mismatch %x", reg_data);
+               goto clean;
+       }
+
+       pci_set_master(dev);
+
+       status = readl(iobase + 0x68);
+       status |= 0x900;
+       writel(status, iobase + 0x68);
+
+       dev->dev.dma_mask = NULL;
+       hcd = isp1760_register(pci_mem_phy0, length, dev->irq,
+               IRQF_SHARED | IRQF_DISABLED, &dev->dev, dev->dev.bus_id);
+       pci_set_drvdata(dev, hcd);
+       if (!hcd)
+               return 0;
+clean:
+       status = -ENODEV;
+       iounmap(iobase);
+       release_mem_region(pci_mem_phy0, length);
+       release_mem_region(nxp_pci_io_base, iolength);
+       return status;
+}
+static void isp1761_pci_remove(struct pci_dev *dev)
+{
+       struct usb_hcd *hcd;
+
+       hcd = pci_get_drvdata(dev);
+
+       usb_remove_hcd(hcd);
+       iounmap(hcd->regs);
+       release_mem_region(hcd->rsrc_start, hcd->rsrc_len);
+       usb_put_hcd(hcd);
+
+       pci_disable_device(dev);
+
+       iounmap(iobase);
+       iounmap(chip_addr);
+
+       release_mem_region(nxp_pci_io_base, iolength);
+       release_mem_region(pci_mem_phy0, length);
+}
+
+static void isp1761_pci_shutdown(struct pci_dev *dev)
+{
+       printk(KERN_ERR "ips1761_pci_shutdown\n");
+}
+
+static const struct pci_device_id isp1760_plx [] = { {
+       /* handle any USB 2.0 EHCI controller */
+       PCI_DEVICE_CLASS(((PCI_CLASS_BRIDGE_OTHER << 8) | (0x06 << 16)), ~0),
+               .driver_data = 0,
+},
+{ /* end: all zeroes */ }
+};
+MODULE_DEVICE_TABLE(pci, isp1760_plx);
+
+static struct pci_driver isp1761_pci_driver = {
+       .name =         "isp1760",
+       .id_table =     isp1760_plx,
+       .probe =        isp1761_pci_probe,
+       .remove =       isp1761_pci_remove,
+       .shutdown =     isp1761_pci_shutdown,
+};
+#endif
+
+static int __init isp1760_init(void)
+{
+       int ret;
+
+       init_kmem_once();
+
+#ifdef CONFIG_USB_ISP1760_OF
+       ret = of_register_platform_driver(&isp1760_of_driver);
+       if (ret) {
+               deinit_kmem_cache();
+               return ret;
+       }
+#endif
+#ifdef CONFIG_USB_ISP1760_PCI
+       ret = pci_register_driver(&isp1761_pci_driver);
+       if (ret)
+               goto unreg_of;
+#endif
+       return ret;
+
+#ifdef CONFIG_USB_ISP1760_PCI
+unreg_of:
+#endif
+#ifdef CONFIG_USB_ISP1760_OF
+       of_unregister_platform_driver(&isp1760_of_driver);
+#endif
+       deinit_kmem_cache();
+       return ret;
+}
+module_init(isp1760_init);
+
+static void __exit isp1760_exit(void)
+{
+#ifdef CONFIG_USB_ISP1760_OF
+       of_unregister_platform_driver(&isp1760_of_driver);
+#endif
+#ifdef CONFIG_USB_ISP1760_PCI
+       pci_unregister_driver(&isp1761_pci_driver);
+#endif
+       deinit_kmem_cache();
+}
+module_exit(isp1760_exit);