[patch v11 3/4] USB: add Cypress c67x00 OTG controller HCD driver

Grant Likely grant.likely at secretlab.ca
Wed Apr 30 06:26:18 EST 2008


On Sun, Apr 27, 2008 at 12:59 AM, Peter Korsgaard <jacmet at sunsite.dk> wrote:
> This patch adds HCD support for the Cypress c67x00 family of devices.
>
>  Signed-off-by: Peter Korsgaard <jacmet at sunsite.dk>

Acked-by: Grant Likely <grant.likely at secretlab.ca>

>  ---
>   drivers/usb/Makefile               |    2
>   drivers/usb/c67x00/Makefile        |    9
>   drivers/usb/c67x00/c67x00-drv.c    |   13
>   drivers/usb/c67x00/c67x00-hcd.c    |  412 +++++++++++++
>   drivers/usb/c67x00/c67x00-hcd.h    |  133 ++++
>   drivers/usb/c67x00/c67x00-ll-hpi.c |   75 ++
>   drivers/usb/c67x00/c67x00-sched.c  | 1170 +++++++++++++++++++++++++++++++++++++
>   drivers/usb/c67x00/c67x00.h        |    9
>   drivers/usb/host/Kconfig           |   13
>   9 files changed, 1836 insertions(+)
>
>  Index: linux-2.6/drivers/usb/c67x00/c67x00-hcd.c
>  ===================================================================
>  --- /dev/null
>  +++ linux-2.6/drivers/usb/c67x00/c67x00-hcd.c
>  @@ -0,0 +1,412 @@
>  +/*
>  + * c67x00-hcd.c: Cypress C67X00 USB Host Controller Driver
>  + *
>  + * Copyright (C) 2006-2008 Barco N.V.
>  + *    Derived from the Cypress cy7c67200/300 ezusb linux driver and
>  + *    based on multiple host controller drivers inside the linux kernel.
>  + *
>  + * This program is free software; you can redistribute it and/or modify
>  + * it under the terms of the GNU General Public License as published by
>  + * the Free Software Foundation; either version 2 of the License, or
>  + * (at your option) any later version.
>  + *
>  + * This program is distributed in the hope that it will be useful,
>  + * but WITHOUT ANY WARRANTY; without even the implied warranty of
>  + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
>  + * GNU General Public License for more details.
>  + *
>  + * You should have received a copy of the GNU General Public License
>  + * along with this program; if not, write to the Free Software
>  + * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
>  + * MA  02110-1301  USA.
>  + */
>  +
>  +#include <linux/device.h>
>  +#include <linux/platform_device.h>
>  +#include <linux/usb.h>
>  +
>  +#include "c67x00.h"
>  +#include "c67x00-hcd.h"
>  +
>  +/* --------------------------------------------------------------------------
>  + * Root Hub Support
>  + */
>  +
>  +static __u8 c67x00_hub_des[] = {
>  +       0x09,                   /*  __u8  bLength; */
>  +       0x29,                   /*  __u8  bDescriptorType; Hub-descriptor */
>  +       0x02,                   /*  __u8  bNbrPorts; */
>  +       0x00,                   /* __u16  wHubCharacteristics; */
>  +       0x00,                   /*   (per-port OC, no power switching) */
>  +       0x32,                   /*  __u8  bPwrOn2pwrGood; 2ms */
>  +       0x00,                   /*  __u8  bHubContrCurrent; 0 mA */
>  +       0x00,                   /*  __u8  DeviceRemovable; ** 7 Ports max ** */
>  +       0xff,                   /*  __u8  PortPwrCtrlMask; ** 7 ports max ** */
>  +};
>  +
>  +static void c67x00_hub_reset_host_port(struct c67x00_sie *sie, int port)
>  +{
>  +       struct c67x00_hcd *c67x00 = sie->private_data;
>  +       unsigned long flags;
>  +
>  +       c67x00_ll_husb_reset(sie, port);
>  +
>  +       spin_lock_irqsave(&c67x00->lock, flags);
>  +       c67x00_ll_husb_reset_port(sie, port);
>  +       spin_unlock_irqrestore(&c67x00->lock, flags);
>  +
>  +       c67x00_ll_set_husb_eot(sie->dev, DEFAULT_EOT);
>  +}
>  +
>  +static int c67x00_hub_status_data(struct usb_hcd *hcd, char *buf)
>  +{
>  +       struct c67x00_hcd *c67x00 = hcd_to_c67x00_hcd(hcd);
>  +       struct c67x00_sie *sie = c67x00->sie;
>  +       u16 status;
>  +       int i;
>  +
>  +       *buf = 0;
>  +       status = c67x00_ll_usb_get_status(sie);
>  +       for (i = 0; i < C67X00_PORTS; i++)
>  +               if (status & PORT_CONNECT_CHANGE(i))
>  +                       *buf |= (1 << i);
>  +
>  +       /* bit 0 denotes hub change, b1..n port change */
>  +       *buf <<= 1;
>  +
>  +       return !!*buf;
>  +}
>  +
>  +static int c67x00_hub_control(struct usb_hcd *hcd, u16 typeReq, u16 wValue,
>  +                             u16 wIndex, char *buf, u16 wLength)
>  +{
>  +       struct c67x00_hcd *c67x00 = hcd_to_c67x00_hcd(hcd);
>  +       struct c67x00_sie *sie = c67x00->sie;
>  +       u16 status, usb_status;
>  +       int len = 0;
>  +       unsigned int port = wIndex-1;
>  +       u16 wPortChange, wPortStatus;
>  +
>  +       switch (typeReq) {
>  +
>  +       case GetHubStatus:
>  +               *(__le32 *) buf = cpu_to_le32(0);
>  +               len = 4;                /* hub power */
>  +               break;
>  +
>  +       case GetPortStatus:
>  +               if (wIndex > C67X00_PORTS)
>  +                       return -EPIPE;
>  +
>  +               status = c67x00_ll_usb_get_status(sie);
>  +               usb_status = c67x00_ll_get_usb_ctl(sie);
>  +
>  +               wPortChange = 0;
>  +               if (status & PORT_CONNECT_CHANGE(port))
>  +                       wPortChange |= USB_PORT_STAT_C_CONNECTION;
>  +
>  +               wPortStatus = USB_PORT_STAT_POWER;
>  +               if (!(status & PORT_SE0_STATUS(port)))
>  +                       wPortStatus |= USB_PORT_STAT_CONNECTION;
>  +               if (usb_status & LOW_SPEED_PORT(port)) {
>  +                       wPortStatus |= USB_PORT_STAT_LOW_SPEED;
>  +                       c67x00->low_speed_ports |= (1 << port);
>  +               } else
>  +                       c67x00->low_speed_ports &= ~(1 << port);
>  +
>  +               if (usb_status & SOF_EOP_EN(port))
>  +                       wPortStatus |= USB_PORT_STAT_ENABLE;
>  +
>  +               *(__le16 *) buf = cpu_to_le16(wPortStatus);
>  +               *(__le16 *) (buf + 2) = cpu_to_le16(wPortChange);
>  +               len = 4;
>  +               break;
>  +
>  +       case SetHubFeature:     /* We don't implement these */
>  +       case ClearHubFeature:
>  +               switch (wValue) {
>  +               case C_HUB_OVER_CURRENT:
>  +               case C_HUB_LOCAL_POWER:
>  +                       len = 0;
>  +                       break;
>  +
>  +               default:
>  +                       return -EPIPE;
>  +               }
>  +               break;
>  +
>  +       case SetPortFeature:
>  +               if (wIndex > C67X00_PORTS)
>  +                       return -EPIPE;
>  +
>  +               switch (wValue) {
>  +               case USB_PORT_FEAT_SUSPEND:
>  +                       dev_dbg(c67x00_hcd_dev(c67x00),
>  +                               "SetPortFeature %d (SUSPEND)\n", port);
>  +                       len = 0;
>  +                       break;
>  +
>  +               case USB_PORT_FEAT_RESET:
>  +                       c67x00_hub_reset_host_port(sie, port);
>  +                       len = 0;
>  +                       break;
>  +
>  +               case USB_PORT_FEAT_POWER:
>  +                       /* Power always enabled */
>  +                       len = 0;
>  +                       break;
>  +
>  +               default:
>  +                       dev_dbg(c67x00_hcd_dev(c67x00),
>  +                               "%s: SetPortFeature %d (0x%04x) Error!\n",
>  +                               __func__, port, wValue);
>  +                       return -EPIPE;
>  +               }
>  +               break;
>  +
>  +       case ClearPortFeature:
>  +               if (wIndex > C67X00_PORTS)
>  +                       return -EPIPE;
>  +
>  +               switch (wValue) {
>  +               case USB_PORT_FEAT_ENABLE:
>  +                       /* Reset the port so that the c67x00 also notices the
>  +                        * disconnect */
>  +                       c67x00_hub_reset_host_port(sie, port);
>  +                       len = 0;
>  +                       break;
>  +
>  +               case USB_PORT_FEAT_C_ENABLE:
>  +                       dev_dbg(c67x00_hcd_dev(c67x00),
>  +                               "ClearPortFeature (%d): C_ENABLE\n", port);
>  +                       len = 0;
>  +                       break;
>  +
>  +               case USB_PORT_FEAT_SUSPEND:
>  +                       dev_dbg(c67x00_hcd_dev(c67x00),
>  +                               "ClearPortFeature (%d): SUSPEND\n", port);
>  +                       len = 0;
>  +                       break;
>  +
>  +               case USB_PORT_FEAT_C_SUSPEND:
>  +                       dev_dbg(c67x00_hcd_dev(c67x00),
>  +                               "ClearPortFeature (%d): C_SUSPEND\n", port);
>  +                       len = 0;
>  +                       break;
>  +
>  +               case USB_PORT_FEAT_POWER:
>  +                       dev_dbg(c67x00_hcd_dev(c67x00),
>  +                               "ClearPortFeature (%d): POWER\n", port);
>  +                       return -EPIPE;
>  +
>  +               case USB_PORT_FEAT_C_CONNECTION:
>  +                       c67x00_ll_usb_clear_status(sie,
>  +                                                  PORT_CONNECT_CHANGE(port));
>  +                       len = 0;
>  +                       break;
>  +
>  +               case USB_PORT_FEAT_C_OVER_CURRENT:
>  +                       dev_dbg(c67x00_hcd_dev(c67x00),
>  +                               "ClearPortFeature (%d): OVER_CURRENT\n", port);
>  +                       len = 0;
>  +                       break;
>  +
>  +               case USB_PORT_FEAT_C_RESET:
>  +                       dev_dbg(c67x00_hcd_dev(c67x00),
>  +                               "ClearPortFeature (%d): C_RESET\n", port);
>  +                       len = 0;
>  +                       break;
>  +
>  +               default:
>  +                       dev_dbg(c67x00_hcd_dev(c67x00),
>  +                               "%s: ClearPortFeature %d (0x%04x) Error!\n",
>  +                               __func__, port, wValue);
>  +                       return -EPIPE;
>  +               }
>  +               break;
>  +
>  +       case GetHubDescriptor:
>  +               len = min_t(unsigned int, sizeof(c67x00_hub_des), wLength);
>  +               memcpy(buf, c67x00_hub_des, len);
>  +               break;
>  +
>  +       default:
>  +               dev_dbg(c67x00_hcd_dev(c67x00), "%s: unknown\n", __func__);
>  +               return -EPIPE;
>  +       }
>  +
>  +       return 0;
>  +}
>  +
>  +/* ---------------------------------------------------------------------
>  + * Main part of host controller driver
>  + */
>  +
>  +/**
>  + * c67x00_hcd_irq
>  + *
>  + * This function is called from the interrupt handler in c67x00-drv.c
>  + */
>  +static void c67x00_hcd_irq(struct c67x00_sie *sie, u16 int_status, u16 msg)
>  +{
>  +       struct c67x00_hcd *c67x00 = sie->private_data;
>  +       struct usb_hcd *hcd = c67x00_hcd_to_hcd(c67x00);
>  +
>  +       /* Handle sie message flags */
>  +       if (msg) {
>  +               if (msg & HUSB_TDListDone)
>  +                       c67x00_sched_kick(c67x00);
>  +               else
>  +                       dev_warn(c67x00_hcd_dev(c67x00),
>  +                                "Unknown SIE msg flag(s): 0x%04x\n", msg);
>  +       }
>  +
>  +       if (unlikely(hcd->state == HC_STATE_HALT))
>  +               return;
>  +
>  +       if (!test_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags))
>  +               return;
>  +
>  +       /* Handle Start of frame events */
>  +       if (int_status & SOFEOP_FLG(sie->sie_num)) {
>  +               c67x00_ll_usb_clear_status(sie, SOF_EOP_IRQ_FLG);
>  +               c67x00_sched_kick(c67x00);
>  +               set_bit(HCD_FLAG_SAW_IRQ, &hcd->flags);
>  +       }
>  +}
>  +
>  +/**
>  + * c67x00_hcd_start: Host controller start hook
>  + */
>  +static int c67x00_hcd_start(struct usb_hcd *hcd)
>  +{
>  +       hcd->uses_new_polling = 1;
>  +       hcd->state = HC_STATE_RUNNING;
>  +       hcd->poll_rh = 1;
>  +
>  +       return 0;
>  +}
>  +
>  +/**
>  + * c67x00_hcd_stop: Host controller stop hook
>  + */
>  +static void c67x00_hcd_stop(struct usb_hcd *hcd)
>  +{
>  +       /* Nothing to do */
>  +}
>  +
>  +static int c67x00_hcd_get_frame(struct usb_hcd *hcd)
>  +{
>  +       struct c67x00_hcd *c67x00 = hcd_to_c67x00_hcd(hcd);
>  +       u16 temp_val;
>  +
>  +       dev_dbg(c67x00_hcd_dev(c67x00), "%s\n", __func__);
>  +       temp_val = c67x00_ll_husb_get_frame(c67x00->sie);
>  +       temp_val &= HOST_FRAME_MASK;
>  +       return temp_val ? (temp_val - 1) : HOST_FRAME_MASK;
>  +}
>  +
>  +static struct hc_driver c67x00_hc_driver = {
>  +       .description    = "c67x00-hcd",
>  +       .product_desc   = "Cypress C67X00 Host Controller",
>  +       .hcd_priv_size  = sizeof(struct c67x00_hcd),
>  +       .flags          = HCD_USB11 | HCD_MEMORY,
>  +
>  +       /*
>  +        * basic lifecycle operations
>  +        */
>  +       .start          = c67x00_hcd_start,
>  +       .stop           = c67x00_hcd_stop,
>  +
>  +       /*
>  +        * managing i/o requests and associated device resources
>  +        */
>  +       .urb_enqueue    = c67x00_urb_enqueue,
>  +       .urb_dequeue    = c67x00_urb_dequeue,
>  +       .endpoint_disable = c67x00_endpoint_disable,
>  +
>  +       /*
>  +        * scheduling support
>  +        */
>  +       .get_frame_number = c67x00_hcd_get_frame,
>  +
>  +       /*
>  +        * root hub support
>  +        */
>  +       .hub_status_data = c67x00_hub_status_data,
>  +       .hub_control    = c67x00_hub_control,
>  +};
>  +
>  +/* ---------------------------------------------------------------------
>  + * Setup/Teardown routines
>  + */
>  +
>  +int c67x00_hcd_probe(struct c67x00_sie *sie)
>  +{
>  +       struct c67x00_hcd *c67x00;
>  +       struct usb_hcd *hcd;
>  +       unsigned long flags;
>  +       int retval;
>  +
>  +       if (usb_disabled())
>  +               return -ENODEV;
>  +
>  +       hcd = usb_create_hcd(&c67x00_hc_driver, sie_dev(sie), "c67x00_sie");
>  +       if (!hcd) {
>  +               retval = -ENOMEM;
>  +               goto err0;
>  +       }
>  +       c67x00 = hcd_to_c67x00_hcd(hcd);
>  +
>  +       spin_lock_init(&c67x00->lock);
>  +       c67x00->sie = sie;
>  +
>  +       INIT_LIST_HEAD(&c67x00->list[PIPE_ISOCHRONOUS]);
>  +       INIT_LIST_HEAD(&c67x00->list[PIPE_INTERRUPT]);
>  +       INIT_LIST_HEAD(&c67x00->list[PIPE_CONTROL]);
>  +       INIT_LIST_HEAD(&c67x00->list[PIPE_BULK]);
>  +       c67x00->urb_count = 0;
>  +       INIT_LIST_HEAD(&c67x00->td_list);
>  +       c67x00->td_base_addr = CY_HCD_BUF_ADDR + SIE_TD_OFFSET(sie->sie_num);
>  +       c67x00->buf_base_addr = CY_HCD_BUF_ADDR + SIE_BUF_OFFSET(sie->sie_num);
>  +       c67x00->max_frame_bw = MAX_FRAME_BW_STD;
>  +
>  +       c67x00_ll_husb_init_host_port(sie);
>  +
>  +       init_completion(&c67x00->endpoint_disable);
>  +       retval = c67x00_sched_start_scheduler(c67x00);
>  +       if (retval)
>  +               goto err1;
>  +
>  +       retval = usb_add_hcd(hcd, 0, 0);
>  +       if (retval) {
>  +               dev_dbg(sie_dev(sie), "%s: usb_add_hcd returned %d\n",
>  +                       __func__, retval);
>  +               goto err2;
>  +       }
>  +
>  +       spin_lock_irqsave(&sie->lock, flags);
>  +       sie->private_data = c67x00;
>  +       sie->irq = c67x00_hcd_irq;
>  +       spin_unlock_irqrestore(&sie->lock, flags);
>  +
>  +       return retval;
>  +
>  + err2:
>  +       c67x00_sched_stop_scheduler(c67x00);
>  + err1:
>  +       usb_put_hcd(hcd);
>  + err0:
>  +       return retval;
>  +}
>  +
>  +/* may be called with controller, bus, and devices active */
>  +void c67x00_hcd_remove(struct c67x00_sie *sie)
>  +{
>  +       struct c67x00_hcd *c67x00 = sie->private_data;
>  +       struct usb_hcd *hcd = c67x00_hcd_to_hcd(c67x00);
>  +
>  +       c67x00_sched_stop_scheduler(c67x00);
>  +       usb_remove_hcd(hcd);
>  +       usb_put_hcd(hcd);
>  +}
>  Index: linux-2.6/drivers/usb/c67x00/c67x00-hcd.h
>  ===================================================================
>  --- /dev/null
>  +++ linux-2.6/drivers/usb/c67x00/c67x00-hcd.h
>  @@ -0,0 +1,133 @@
>  +/*
>  + * c67x00-hcd.h: Cypress C67X00 USB HCD
>  + *
>  + * Copyright (C) 2006-2008 Barco N.V.
>  + *    Derived from the Cypress cy7c67200/300 ezusb linux driver and
>  + *    based on multiple host controller drivers inside the linux kernel.
>  + *
>  + * This program is free software; you can redistribute it and/or modify
>  + * it under the terms of the GNU General Public License as published by
>  + * the Free Software Foundation; either version 2 of the License, or
>  + * (at your option) any later version.
>  + *
>  + * This program is distributed in the hope that it will be useful,
>  + * but WITHOUT ANY WARRANTY; without even the implied warranty of
>  + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
>  + * GNU General Public License for more details.
>  + *
>  + * You should have received a copy of the GNU General Public License
>  + * along with this program; if not, write to the Free Software
>  + * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
>  + * MA  02110-1301  USA.
>  + */
>  +
>  +#ifndef _USB_C67X00_HCD_H
>  +#define _USB_C67X00_HCD_H
>  +
>  +#include <linux/kernel.h>
>  +#include <linux/spinlock.h>
>  +#include <linux/list.h>
>  +#include <linux/usb.h>
>  +#include "../core/hcd.h"
>  +#include "c67x00.h"
>  +
>  +/*
>  + * The following parameters depend on the CPU speed, bus speed, ...
>  + * These can be tuned for specific use cases, e.g. if isochronous transfers
>  + * are very important, bandwith can be sacrificed to guarantee that the
>  + * 1ms deadline will be met.
>  + * If bulk transfers are important, the MAX_FRAME_BW can be increased,
>  + * but some (or many) isochronous deadlines might not be met.
>  + *
>  + * The values are specified in bittime.
>  + */
>  +
>  +/*
>  + * The current implementation switches between _STD (default) and _ISO (when
>  + * isochronous transfers are scheduled), in order to optimize the throughput
>  + * in normal cicrumstances, but also provide good isochronous behaviour.
>  + *
>  + * Bandwidth is described in bit time so with a 12MHz USB clock and 1ms
>  + * frames; there are 12000 bit times per frame.
>  + */
>  +
>  +#define TOTAL_FRAME_BW         12000
>  +#define DEFAULT_EOT            2250
>  +
>  +#define MAX_FRAME_BW_STD       (TOTAL_FRAME_BW - DEFAULT_EOT)
>  +#define MAX_FRAME_BW_ISO       2400
>  +
>  +/*
>  + * Periodic transfers may only use 90% of the full frame, but as
>  + * we currently don't even use 90% of the full frame, we may
>  + * use the full usable time for periodic transfers.
>  + */
>  +#define MAX_PERIODIC_BW(full_bw)       full_bw
>  +
>  +/* -------------------------------------------------------------------------- */
>  +
>  +struct c67x00_hcd {
>  +       spinlock_t lock;
>  +       struct c67x00_sie *sie;
>  +       unsigned int low_speed_ports;   /* bitmask of low speed ports */
>  +       unsigned int urb_count;
>  +       unsigned int urb_iso_count;
>  +
>  +       struct list_head list[4];       /* iso, int, ctrl, bulk */
>  +#if PIPE_BULK != 3
>  +#error "Sanity check failed, this code presumes PIPE_... to range from 0 to 3"
>  +#endif
>  +
>  +       /* USB bandwidth allocated to td_list */
>  +       int bandwidth_allocated;
>  +       /* USB bandwidth allocated for isoc/int transfer */
>  +       int periodic_bw_allocated;
>  +       struct list_head td_list;
>  +       int max_frame_bw;
>  +
>  +       u16 td_base_addr;
>  +       u16 buf_base_addr;
>  +       u16 next_td_addr;
>  +       u16 next_buf_addr;
>  +
>  +       struct tasklet_struct tasklet;
>  +
>  +       struct completion endpoint_disable;
>  +
>  +       u16 current_frame;
>  +       u16 last_frame;
>  +};
>  +
>  +static inline struct c67x00_hcd *hcd_to_c67x00_hcd(struct usb_hcd *hcd)
>  +{
>  +       return (struct c67x00_hcd *)(hcd->hcd_priv);
>  +}
>  +
>  +static inline struct usb_hcd *c67x00_hcd_to_hcd(struct c67x00_hcd *c67x00)
>  +{
>  +       return container_of((void *)c67x00, struct usb_hcd, hcd_priv);
>  +}
>  +
>  +/* ---------------------------------------------------------------------
>  + * Functions used by c67x00-drv
>  + */
>  +
>  +int c67x00_hcd_probe(struct c67x00_sie *sie);
>  +void c67x00_hcd_remove(struct c67x00_sie *sie);
>  +
>  +/* ---------------------------------------------------------------------
>  + * Transfer Descriptor scheduling functions
>  + */
>  +int c67x00_urb_enqueue(struct usb_hcd *hcd, struct urb *urb, gfp_t mem_flags);
>  +int c67x00_urb_dequeue(struct usb_hcd *hcd, struct urb *urb, int status);
>  +void c67x00_endpoint_disable(struct usb_hcd *hcd,
>  +                            struct usb_host_endpoint *ep);
>  +
>  +void c67x00_hcd_msg_received(struct c67x00_sie *sie, u16 msg);
>  +void c67x00_sched_kick(struct c67x00_hcd *c67x00);
>  +int c67x00_sched_start_scheduler(struct c67x00_hcd *c67x00);
>  +void c67x00_sched_stop_scheduler(struct c67x00_hcd *c67x00);
>  +
>  +#define c67x00_hcd_dev(x)      (c67x00_hcd_to_hcd(x)->self.controller)
>  +
>  +#endif                         /* _USB_C67X00_HCD_H */
>  Index: linux-2.6/drivers/usb/c67x00/c67x00-sched.c
>  ===================================================================
>  --- /dev/null
>  +++ linux-2.6/drivers/usb/c67x00/c67x00-sched.c
>  @@ -0,0 +1,1170 @@
>  +/*
>  + * c67x00-sched.c: Cypress C67X00 USB Host Controller Driver - TD scheduling
>  + *
>  + * Copyright (C) 2006-2008 Barco N.V.
>  + *    Derived from the Cypress cy7c67200/300 ezusb linux driver and
>  + *    based on multiple host controller drivers inside the linux kernel.
>  + *
>  + * This program is free software; you can redistribute it and/or modify
>  + * it under the terms of the GNU General Public License as published by
>  + * the Free Software Foundation; either version 2 of the License, or
>  + * (at your option) any later version.
>  + *
>  + * This program is distributed in the hope that it will be useful,
>  + * but WITHOUT ANY WARRANTY; without even the implied warranty of
>  + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
>  + * GNU General Public License for more details.
>  + *
>  + * You should have received a copy of the GNU General Public License
>  + * along with this program; if not, write to the Free Software
>  + * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
>  + * MA  02110-1301  USA.
>  + */
>  +
>  +#include <linux/kthread.h>
>  +
>  +#include "c67x00.h"
>  +#include "c67x00-hcd.h"
>  +
>  +/*
>  + * These are the stages for a control urb, they are kept
>  + * in both urb->interval and td->privdata.
>  + */
>  +#define SETUP_STAGE            0
>  +#define DATA_STAGE             1
>  +#define STATUS_STAGE           2
>  +
>  +/* -------------------------------------------------------------------------- */
>  +
>  +/**
>  + * struct c67x00_ep_data: Host endpoint data structure
>  + */
>  +struct c67x00_ep_data {
>  +       struct list_head queue;
>  +       struct list_head node;
>  +       struct usb_host_endpoint *hep;
>  +       struct usb_device *dev;
>  +       u16 next_frame;         /* For int/isoc transactions */
>  +};
>  +
>  +/**
>  + * struct c67x00_td
>  + *
>  + * Hardware parts are little endiannes, SW in CPU endianess.
>  + */
>  +struct c67x00_td {
>  +       /* HW specific part */
>  +       __le16 ly_base_addr;    /* Bytes 0-1 */
>  +       __le16 port_length;     /* Bytes 2-3 */
>  +       u8 pid_ep;              /* Byte 4 */
>  +       u8 dev_addr;            /* Byte 5 */
>  +       u8 ctrl_reg;            /* Byte 6 */
>  +       u8 status;              /* Byte 7 */
>  +       u8 retry_cnt;           /* Byte 8 */
>  +#define TT_OFFSET              2
>  +#define TT_CONTROL             0
>  +#define TT_ISOCHRONOUS         1
>  +#define TT_BULK                        2
>  +#define TT_INTERRUPT           3
>  +       u8 residue;             /* Byte 9 */
>  +       __le16 next_td_addr;    /* Bytes 10-11 */
>  +       /* SW part */
>  +       struct list_head td_list;
>  +       u16 td_addr;
>  +       void *data;
>  +       struct urb *urb;
>  +       unsigned long privdata;
>  +
>  +       /* These are needed for handling the toggle bits:
>  +        * an urb can be dequeued while a td is in progress
>  +        * after checking the td, the toggle bit might need to
>  +        * be fixed */
>  +       struct c67x00_ep_data *ep_data;
>  +       unsigned int pipe;
>  +};
>  +
>  +struct c67x00_urb_priv {
>  +       struct list_head hep_node;
>  +       struct urb *urb;
>  +       int port;
>  +       int cnt;                /* packet number for isoc */
>  +       int status;
>  +       struct c67x00_ep_data *ep_data;
>  +};
>  +
>  +#define td_udev(td)    ((td)->ep_data->dev)
>  +
>  +#define CY_TD_SIZE             12
>  +
>  +#define TD_PIDEP_OFFSET                0x04
>  +#define TD_PIDEPMASK_PID       0xF0
>  +#define TD_PIDEPMASK_EP                0x0F
>  +#define TD_PORTLENMASK_DL      0x02FF
>  +#define TD_PORTLENMASK_PN      0xC000
>  +
>  +#define TD_STATUS_OFFSET       0x07
>  +#define TD_STATUSMASK_ACK      0x01
>  +#define TD_STATUSMASK_ERR      0x02
>  +#define TD_STATUSMASK_TMOUT    0x04
>  +#define TD_STATUSMASK_SEQ      0x08
>  +#define TD_STATUSMASK_SETUP    0x10
>  +#define TD_STATUSMASK_OVF      0x20
>  +#define TD_STATUSMASK_NAK      0x40
>  +#define TD_STATUSMASK_STALL    0x80
>  +
>  +#define TD_ERROR_MASK          (TD_STATUSMASK_ERR | TD_STATUSMASK_TMOUT | \
>  +                                TD_STATUSMASK_STALL)
>  +
>  +#define TD_RETRYCNT_OFFSET     0x08
>  +#define TD_RETRYCNTMASK_ACT_FLG        0x10
>  +#define TD_RETRYCNTMASK_TX_TYPE        0x0C
>  +#define TD_RETRYCNTMASK_RTY_CNT        0x03
>  +
>  +#define TD_RESIDUE_OVERFLOW    0x80
>  +
>  +#define TD_PID_IN              0x90
>  +
>  +/* Residue: signed 8bits, neg -> OVERFLOW, pos -> UNDERFLOW */
>  +#define td_residue(td)         ((__s8)(td->residue))
>  +#define td_ly_base_addr(td)    (__le16_to_cpu((td)->ly_base_addr))
>  +#define td_port_length(td)     (__le16_to_cpu((td)->port_length))
>  +#define td_next_td_addr(td)    (__le16_to_cpu((td)->next_td_addr))
>  +
>  +#define td_active(td)          ((td)->retry_cnt & TD_RETRYCNTMASK_ACT_FLG)
>  +#define td_length(td)          (td_port_length(td) & TD_PORTLENMASK_DL)
>  +
>  +#define td_sequence_ok(td)     (!td->status || \
>  +                                (!(td->status & TD_STATUSMASK_SEQ) ==  \
>  +                                 !(td->ctrl_reg & SEQ_SEL)))
>  +
>  +#define td_acked(td)           (!td->status || \
>  +                                (td->status & TD_STATUSMASK_ACK))
>  +#define td_actual_bytes(td)    (td_length(td) - td_residue(td))
>  +
>  +/* -------------------------------------------------------------------------- */
>  +
>  +#ifdef DEBUG
>  +
>  +/**
>  + * dbg_td - Dump the contents of the TD
>  + */
>  +static void dbg_td(struct c67x00_hcd *c67x00, struct c67x00_td *td, char *msg)
>  +{
>  +       struct device *dev = c67x00_hcd_dev(c67x00);
>  +
>  +       dev_dbg(dev, "### %s at 0x%04x\n", msg, td->td_addr);
>  +       dev_dbg(dev, "urb:      0x%p\n", td->urb);
>  +       dev_dbg(dev, "endpoint:   %4d\n", usb_pipeendpoint(td->pipe));
>  +       dev_dbg(dev, "pipeout:    %4d\n", usb_pipeout(td->pipe));
>  +       dev_dbg(dev, "ly_base_addr: 0x%04x\n", td_ly_base_addr(td));
>  +       dev_dbg(dev, "port_length:  0x%04x\n", td_port_length(td));
>  +       dev_dbg(dev, "pid_ep:         0x%02x\n", td->pid_ep);
>  +       dev_dbg(dev, "dev_addr:       0x%02x\n", td->dev_addr);
>  +       dev_dbg(dev, "ctrl_reg:       0x%02x\n", td->ctrl_reg);
>  +       dev_dbg(dev, "status:         0x%02x\n", td->status);
>  +       dev_dbg(dev, "retry_cnt:      0x%02x\n", td->retry_cnt);
>  +       dev_dbg(dev, "residue:        0x%02x\n", td->residue);
>  +       dev_dbg(dev, "next_td_addr: 0x%04x\n", td_next_td_addr(td));
>  +       dev_dbg(dev, "data:");
>  +       print_hex_dump(KERN_DEBUG, "", DUMP_PREFIX_OFFSET, 16, 1,
>  +                      td->data, td_length(td), 1);
>  +}
>  +#else                          /* DEBUG */
>  +
>  +static inline void
>  +dbg_td(struct c67x00_hcd *c67x00, struct c67x00_td *td, char *msg) { }
>  +
>  +#endif                         /* DEBUG */
>  +
>  +/* -------------------------------------------------------------------------- */
>  +/* Helper functions */
>  +
>  +static inline u16 c67x00_get_current_frame_number(struct c67x00_hcd *c67x00)
>  +{
>  +       return c67x00_ll_husb_get_frame(c67x00->sie) & HOST_FRAME_MASK;
>  +}
>  +
>  +/**
>  + * frame_add
>  + * Software wraparound for framenumbers.
>  + */
>  +static inline u16 frame_add(u16 a, u16 b)
>  +{
>  +       return (a + b) & HOST_FRAME_MASK;
>  +}
>  +
>  +/**
>  + * frame_after - is frame a after frame b
>  + */
>  +static inline int frame_after(u16 a, u16 b)
>  +{
>  +       return ((HOST_FRAME_MASK + a - b) & HOST_FRAME_MASK) <
>  +           (HOST_FRAME_MASK / 2);
>  +}
>  +
>  +/**
>  + * frame_after_eq - is frame a after or equal to frame b
>  + */
>  +static inline int frame_after_eq(u16 a, u16 b)
>  +{
>  +       return ((HOST_FRAME_MASK + 1 + a - b) & HOST_FRAME_MASK) <
>  +           (HOST_FRAME_MASK / 2);
>  +}
>  +
>  +/* -------------------------------------------------------------------------- */
>  +
>  +/**
>  + * c67x00_release_urb - remove link from all tds to this urb
>  + * Disconnects the urb from it's tds, so that it can be given back.
>  + * pre: urb->hcpriv != NULL
>  + */
>  +static void c67x00_release_urb(struct c67x00_hcd *c67x00, struct urb *urb)
>  +{
>  +       struct c67x00_td *td;
>  +       struct c67x00_urb_priv *urbp;
>  +
>  +       BUG_ON(!urb);
>  +
>  +       c67x00->urb_count--;
>  +
>  +       if (usb_pipetype(urb->pipe) == PIPE_ISOCHRONOUS) {
>  +               c67x00->urb_iso_count--;
>  +               if (c67x00->urb_iso_count == 0)
>  +                       c67x00->max_frame_bw = MAX_FRAME_BW_STD;
>  +       }
>  +
>  +       /* TODO this might be not so efficient when we've got many urbs!
>  +        * Alternatives:
>  +        *   * only clear when needed
>  +        *   * keep a list of tds with each urbp
>  +        */
>  +       list_for_each_entry(td, &c67x00->td_list, td_list)
>  +               if (urb == td->urb)
>  +                       td->urb = NULL;
>  +
>  +       urbp = urb->hcpriv;
>  +       urb->hcpriv = NULL;
>  +       list_del(&urbp->hep_node);
>  +       kfree(urbp);
>  +}
>  +
>  +/* -------------------------------------------------------------------------- */
>  +
>  +static struct c67x00_ep_data *
>  +c67x00_ep_data_alloc(struct c67x00_hcd *c67x00, struct urb *urb)
>  +{
>  +       struct usb_host_endpoint *hep = urb->ep;
>  +       struct c67x00_ep_data *ep_data;
>  +       int type;
>  +
>  +       c67x00->current_frame = c67x00_get_current_frame_number(c67x00);
>  +
>  +       /* Check if endpoint already has a c67x00_ep_data struct allocated */
>  +       if (hep->hcpriv) {
>  +               ep_data = hep->hcpriv;
>  +               if (frame_after(c67x00->current_frame, ep_data->next_frame))
>  +                       ep_data->next_frame =
>  +                           frame_add(c67x00->current_frame, 1);
>  +               return hep->hcpriv;
>  +       }
>  +
>  +       /* Allocate and initialize a new c67x00 endpoint data structure */
>  +       ep_data = kzalloc(sizeof(*ep_data), GFP_ATOMIC);
>  +       if (!ep_data)
>  +               return NULL;
>  +
>  +       INIT_LIST_HEAD(&ep_data->queue);
>  +       INIT_LIST_HEAD(&ep_data->node);
>  +       ep_data->hep = hep;
>  +
>  +       /* hold a reference to udev as long as this endpoint lives,
>  +        * this is needed to possibly fix the data toggle */
>  +       ep_data->dev = usb_get_dev(urb->dev);
>  +       hep->hcpriv = ep_data;
>  +
>  +       /* For ISOC and INT endpoints, start ASAP: */
>  +       ep_data->next_frame = frame_add(c67x00->current_frame, 1);
>  +
>  +       /* Add the endpoint data to one of the pipe lists; must be added
>  +          in order of endpoint address */
>  +       type = usb_pipetype(urb->pipe);
>  +       if (list_empty(&ep_data->node)) {
>  +               list_add(&ep_data->node, &c67x00->list[type]);
>  +       } else {
>  +               struct c67x00_ep_data *prev;
>  +
>  +               list_for_each_entry(prev, &c67x00->list[type], node) {
>  +                       if (prev->hep->desc.bEndpointAddress >
>  +                           hep->desc.bEndpointAddress) {
>  +                               list_add(&ep_data->node, prev->node.prev);
>  +                               break;
>  +                       }
>  +               }
>  +       }
>  +
>  +       return ep_data;
>  +}
>  +
>  +static int c67x00_ep_data_free(struct usb_host_endpoint *hep)
>  +{
>  +       struct c67x00_ep_data *ep_data = hep->hcpriv;
>  +
>  +       if (!ep_data)
>  +               return 0;
>  +
>  +       if (!list_empty(&ep_data->queue))
>  +               return -EBUSY;
>  +
>  +       usb_put_dev(ep_data->dev);
>  +       list_del(&ep_data->queue);
>  +       list_del(&ep_data->node);
>  +
>  +       kfree(ep_data);
>  +       hep->hcpriv = NULL;
>  +
>  +       return 0;
>  +}
>  +
>  +void c67x00_endpoint_disable(struct usb_hcd *hcd, struct usb_host_endpoint *ep)
>  +{
>  +       struct c67x00_hcd *c67x00 = hcd_to_c67x00_hcd(hcd);
>  +       unsigned long flags;
>  +
>  +       if (!list_empty(&ep->urb_list))
>  +               dev_warn(c67x00_hcd_dev(c67x00), "error: urb list not empty\n");
>  +
>  +       spin_lock_irqsave(&c67x00->lock, flags);
>  +
>  +       /* loop waiting for all transfers in the endpoint queue to complete */
>  +       while (c67x00_ep_data_free(ep)) {
>  +               /* Drop the lock so we can sleep waiting for the hardware */
>  +               spin_unlock_irqrestore(&c67x00->lock, flags);
>  +
>  +               /* it could happen that we reinitialize this completion, while
>  +                * somebody was waiting for that completion.  The timeout and
>  +                * while loop handle such cases, but this might be improved */
>  +               INIT_COMPLETION(c67x00->endpoint_disable);
>  +               c67x00_sched_kick(c67x00);
>  +               wait_for_completion_timeout(&c67x00->endpoint_disable, 1 * HZ);
>  +
>  +               spin_lock_irqsave(&c67x00->lock, flags);
>  +       }
>  +
>  +       spin_unlock_irqrestore(&c67x00->lock, flags);
>  +}
>  +
>  +/* -------------------------------------------------------------------------- */
>  +
>  +static inline int get_root_port(struct usb_device *dev)
>  +{
>  +       while (dev->parent->parent)
>  +               dev = dev->parent;
>  +       return dev->portnum;
>  +}
>  +
>  +int c67x00_urb_enqueue(struct usb_hcd *hcd,
>  +                      struct urb *urb, gfp_t mem_flags)
>  +{
>  +       int ret;
>  +       unsigned long flags;
>  +       struct c67x00_urb_priv *urbp;
>  +       struct c67x00_hcd *c67x00 = hcd_to_c67x00_hcd(hcd);
>  +       int port = get_root_port(urb->dev)-1;
>  +
>  +       spin_lock_irqsave(&c67x00->lock, flags);
>  +
>  +       /* Make sure host controller is running */
>  +       if (!HC_IS_RUNNING(hcd->state)) {
>  +               ret = -ENODEV;
>  +               goto err_not_linked;
>  +       }
>  +
>  +       ret = usb_hcd_link_urb_to_ep(hcd, urb);
>  +       if (ret)
>  +               goto err_not_linked;
>  +
>  +       /* Allocate and initialize urb private data */
>  +       urbp = kzalloc(sizeof(*urbp), mem_flags);
>  +       if (!urbp) {
>  +               ret = -ENOMEM;
>  +               goto err_urbp;
>  +       }
>  +
>  +       INIT_LIST_HEAD(&urbp->hep_node);
>  +       urbp->urb = urb;
>  +       urbp->port = port;
>  +
>  +       urbp->ep_data = c67x00_ep_data_alloc(c67x00, urb);
>  +
>  +       if (!urbp->ep_data) {
>  +               ret = -ENOMEM;
>  +               goto err_epdata;
>  +       }
>  +
>  +       /* TODO claim bandwidth with usb_claim_bandwidth?
>  +        * also release it somewhere! */
>  +
>  +       urb->hcpriv = urbp;
>  +
>  +       urb->actual_length = 0; /* Nothing received/transmitted yet */
>  +
>  +       switch (usb_pipetype(urb->pipe)) {
>  +       case PIPE_CONTROL:
>  +               urb->interval = SETUP_STAGE;
>  +               break;
>  +       case PIPE_INTERRUPT:
>  +               break;
>  +       case PIPE_BULK:
>  +               break;
>  +       case PIPE_ISOCHRONOUS:
>  +               if (c67x00->urb_iso_count == 0)
>  +                       c67x00->max_frame_bw = MAX_FRAME_BW_ISO;
>  +               c67x00->urb_iso_count++;
>  +               /* Assume always URB_ISO_ASAP, FIXME */
>  +               if (list_empty(&urbp->ep_data->queue))
>  +                       urb->start_frame = urbp->ep_data->next_frame;
>  +               else {
>  +                       /* Go right after the last one */
>  +                       struct urb *last_urb;
>  +
>  +                       last_urb = list_entry(urbp->ep_data->queue.prev,
>  +                                             struct c67x00_urb_priv,
>  +                                             hep_node)->urb;
>  +                       urb->start_frame =
>  +                           frame_add(last_urb->start_frame,
>  +                                     last_urb->number_of_packets *
>  +                                     last_urb->interval);
>  +               }
>  +               urbp->cnt = 0;
>  +               break;
>  +       }
>  +
>  +       /* Add the URB to the endpoint queue */
>  +       list_add_tail(&urbp->hep_node, &urbp->ep_data->queue);
>  +
>  +       /* If this is the only URB, kick start the controller */
>  +       if (!c67x00->urb_count++)
>  +               c67x00_ll_hpi_enable_sofeop(c67x00->sie);
>  +
>  +       c67x00_sched_kick(c67x00);
>  +       spin_unlock_irqrestore(&c67x00->lock, flags);
>  +
>  +       return 0;
>  +
>  +err_epdata:
>  +       kfree(urbp);
>  +err_urbp:
>  +       usb_hcd_unlink_urb_from_ep(hcd, urb);
>  +err_not_linked:
>  +       spin_unlock_irqrestore(&c67x00->lock, flags);
>  +
>  +       return ret;
>  +}
>  +
>  +int c67x00_urb_dequeue(struct usb_hcd *hcd, struct urb *urb, int status)
>  +{
>  +       struct c67x00_hcd *c67x00 = hcd_to_c67x00_hcd(hcd);
>  +       unsigned long flags;
>  +       int rc;
>  +
>  +       spin_lock_irqsave(&c67x00->lock, flags);
>  +       rc = usb_hcd_check_unlink_urb(hcd, urb, status);
>  +       if (rc)
>  +               goto done;
>  +
>  +       c67x00_release_urb(c67x00, urb);
>  +       usb_hcd_unlink_urb_from_ep(hcd, urb);
>  +
>  +       spin_unlock(&c67x00->lock);
>  +       usb_hcd_giveback_urb(hcd, urb, status);
>  +       spin_lock(&c67x00->lock);
>  +
>  +       spin_unlock_irqrestore(&c67x00->lock, flags);
>  +
>  +       return 0;
>  +
>  + done:
>  +       spin_unlock_irqrestore(&c67x00->lock, flags);
>  +       return rc;
>  +}
>  +
>  +/* -------------------------------------------------------------------------- */
>  +
>  +/*
>  + * pre: c67x00 locked, urb unlocked
>  + */
>  +static void
>  +c67x00_giveback_urb(struct c67x00_hcd *c67x00, struct urb *urb, int status)
>  +{
>  +       struct c67x00_urb_priv *urbp;
>  +
>  +       if (!urb)
>  +               return;
>  +
>  +       urbp = urb->hcpriv;
>  +       urbp->status = status;
>  +
>  +       list_del_init(&urbp->hep_node);
>  +
>  +       c67x00_release_urb(c67x00, urb);
>  +       usb_hcd_unlink_urb_from_ep(c67x00_hcd_to_hcd(c67x00), urb);
>  +       spin_unlock(&c67x00->lock);
>  +       usb_hcd_giveback_urb(c67x00_hcd_to_hcd(c67x00), urb, urbp->status);
>  +       spin_lock(&c67x00->lock);
>  +}
>  +
>  +/* -------------------------------------------------------------------------- */
>  +
>  +static int c67x00_claim_frame_bw(struct c67x00_hcd *c67x00, struct urb *urb,
>  +                                int len, int periodic)
>  +{
>  +       struct c67x00_urb_priv *urbp = urb->hcpriv;
>  +       int bit_time;
>  +
>  +       /* According to the C67x00 BIOS user manual, page 3-18,19, the
>  +        * following calculations provide the full speed bit times for
>  +        * a transaction.
>  +        *
>  +        * FS(in)       = 112.5 +  9.36*BC + HOST_DELAY
>  +        * FS(in,iso)   =  90.5 +  9.36*BC + HOST_DELAY
>  +        * FS(out)      = 112.5 +  9.36*BC + HOST_DELAY
>  +        * FS(out,iso)  =  78.4 +  9.36*BC + HOST_DELAY
>  +        * LS(in)       = 802.4 + 75.78*BC + HOST_DELAY
>  +        * LS(out)      = 802.6 + 74.67*BC + HOST_DELAY
>  +        *
>  +        * HOST_DELAY == 106 for the c67200 and c67300.
>  +        */
>  +
>  +       /* make calculations in 1/100 bit times to maintain resolution */
>  +       if (urbp->ep_data->dev->speed == USB_SPEED_LOW) {
>  +               /* Low speed pipe */
>  +               if (usb_pipein(urb->pipe))
>  +                       bit_time = 80240 + 7578*len;
>  +               else
>  +                       bit_time = 80260 + 7467*len;
>  +       } else {
>  +               /* FS pipes */
>  +               if (usb_pipeisoc(urb->pipe))
>  +                       bit_time = usb_pipein(urb->pipe) ? 9050 : 7840;
>  +               else
>  +                       bit_time = 11250;
>  +               bit_time += 936*len;
>  +       }
>  +
>  +       /* Scale back down to integer bit times.  Use a host delay of 106.
>  +        * (this is the only place it is used) */
>  +       bit_time = ((bit_time+50) / 100) + 106;
>  +
>  +       if (unlikely(bit_time + c67x00->bandwidth_allocated >=
>  +                    c67x00->max_frame_bw))
>  +               return -EMSGSIZE;
>  +
>  +       if (unlikely(c67x00->next_td_addr + CY_TD_SIZE >=
>  +                    c67x00->td_base_addr + SIE_TD_SIZE))
>  +               return -EMSGSIZE;
>  +
>  +       if (unlikely(c67x00->next_buf_addr + len >=
>  +                    c67x00->buf_base_addr + SIE_TD_BUF_SIZE))
>  +               return -EMSGSIZE;
>  +
>  +       if (periodic) {
>  +               if (unlikely(bit_time + c67x00->periodic_bw_allocated >=
>  +                            MAX_PERIODIC_BW(c67x00->max_frame_bw)))
>  +                       return -EMSGSIZE;
>  +               c67x00->periodic_bw_allocated += bit_time;
>  +       }
>  +
>  +       c67x00->bandwidth_allocated += bit_time;
>  +       return 0;
>  +}
>  +
>  +/* -------------------------------------------------------------------------- */
>  +
>  +/**
>  + * td_addr and buf_addr must be word aligned
>  + */
>  +static int c67x00_create_td(struct c67x00_hcd *c67x00, struct urb *urb,
>  +                           void *data, int len, int pid, int toggle,
>  +                           unsigned long privdata)
>  +{
>  +       struct c67x00_td *td;
>  +       struct c67x00_urb_priv *urbp = urb->hcpriv;
>  +       const __u8 active_flag = 1, retry_cnt = 1;
>  +       __u8 cmd = 0;
>  +       int tt = 0;
>  +
>  +       if (c67x00_claim_frame_bw(c67x00, urb, len, usb_pipeisoc(urb->pipe)
>  +                                 || usb_pipeint(urb->pipe)))
>  +               return -EMSGSIZE;       /* Not really an error, but expected */
>  +
>  +       td = kzalloc(sizeof(*td), GFP_ATOMIC);
>  +       if (!td)
>  +               return -ENOMEM;
>  +
>  +       td->pipe = urb->pipe;
>  +       td->ep_data = urbp->ep_data;
>  +
>  +       if ((td_udev(td)->speed == USB_SPEED_LOW) &&
>  +           !(c67x00->low_speed_ports & (1 << urbp->port)))
>  +               cmd |= PREAMBLE_EN;
>  +
>  +       switch (usb_pipetype(td->pipe)) {
>  +       case PIPE_ISOCHRONOUS:
>  +               tt = TT_ISOCHRONOUS;
>  +               cmd |= ISO_EN;
>  +               break;
>  +       case PIPE_CONTROL:
>  +               tt = TT_CONTROL;
>  +               break;
>  +       case PIPE_BULK:
>  +               tt = TT_BULK;
>  +               break;
>  +       case PIPE_INTERRUPT:
>  +               tt = TT_INTERRUPT;
>  +               break;
>  +       }
>  +
>  +       if (toggle)
>  +               cmd |= SEQ_SEL;
>  +
>  +       cmd |= ARM_EN;
>  +
>  +       /* SW part */
>  +       td->td_addr = c67x00->next_td_addr;
>  +       c67x00->next_td_addr = c67x00->next_td_addr + CY_TD_SIZE;
>  +
>  +       /* HW part */
>  +       td->ly_base_addr = __cpu_to_le16(c67x00->next_buf_addr);
>  +       td->port_length = __cpu_to_le16((c67x00->sie->sie_num << 15) |
>  +                                       (urbp->port << 14) | (len & 0x3FF));
>  +       td->pid_ep = ((pid & 0xF) << TD_PIDEP_OFFSET) |
>  +           (usb_pipeendpoint(td->pipe) & 0xF);
>  +       td->dev_addr = usb_pipedevice(td->pipe) & 0x7F;
>  +       td->ctrl_reg = cmd;
>  +       td->status = 0;
>  +       td->retry_cnt = (tt << TT_OFFSET) | (active_flag << 4) | retry_cnt;
>  +       td->residue = 0;
>  +       td->next_td_addr = __cpu_to_le16(c67x00->next_td_addr);
>  +
>  +       /* SW part */
>  +       td->data = data;
>  +       td->urb = urb;
>  +       td->privdata = privdata;
>  +
>  +       c67x00->next_buf_addr += (len + 1) & ~0x01;     /* properly align */
>  +
>  +       list_add_tail(&td->td_list, &c67x00->td_list);
>  +       return 0;
>  +}
>  +
>  +static inline void c67x00_release_td(struct c67x00_td *td)
>  +{
>  +       list_del_init(&td->td_list);
>  +       kfree(td);
>  +}
>  +
>  +/* -------------------------------------------------------------------------- */
>  +
>  +static int c67x00_add_data_urb(struct c67x00_hcd *c67x00, struct urb *urb)
>  +{
>  +       int remaining;
>  +       int toggle;
>  +       int pid;
>  +       int ret = 0;
>  +       int maxps;
>  +       int need_empty;
>  +
>  +       toggle = usb_gettoggle(urb->dev, usb_pipeendpoint(urb->pipe),
>  +                              usb_pipeout(urb->pipe));
>  +       remaining = urb->transfer_buffer_length - urb->actual_length;
>  +
>  +       maxps = usb_maxpacket(urb->dev, urb->pipe, usb_pipeout(urb->pipe));
>  +
>  +       need_empty = (urb->transfer_flags & URB_ZERO_PACKET) &&
>  +           usb_pipeout(urb->pipe) && !(remaining % maxps);
>  +
>  +       while (remaining || need_empty) {
>  +               int len;
>  +               char *td_buf;
>  +
>  +               len = (remaining > maxps) ? maxps : remaining;
>  +               if (!len)
>  +                       need_empty = 0;
>  +
>  +               pid = usb_pipeout(urb->pipe) ? USB_PID_OUT : USB_PID_IN;
>  +               td_buf = urb->transfer_buffer + urb->transfer_buffer_length -
>  +                   remaining;
>  +               ret = c67x00_create_td(c67x00, urb, td_buf, len, pid, toggle,
>  +                                      DATA_STAGE);
>  +               if (ret)
>  +                       return ret;     /* td wasn't created */
>  +
>  +               toggle ^= 1;
>  +               remaining -= len;
>  +               if (usb_pipecontrol(urb->pipe))
>  +                       break;
>  +       }
>  +
>  +       return 0;
>  +}
>  +
>  +/**
>  + * return 0 in case more bandwidth is available, else errorcode
>  + */
>  +static int c67x00_add_ctrl_urb(struct c67x00_hcd *c67x00, struct urb *urb)
>  +{
>  +       int ret;
>  +       int pid;
>  +
>  +       switch (urb->interval) {
>  +       default:
>  +       case SETUP_STAGE:
>  +               ret = c67x00_create_td(c67x00, urb, urb->setup_packet,
>  +                                      8, USB_PID_SETUP, 0, SETUP_STAGE);
>  +               if (ret)
>  +                       return ret;
>  +               urb->interval = SETUP_STAGE;
>  +               usb_settoggle(urb->dev, usb_pipeendpoint(urb->pipe),
>  +                             usb_pipeout(urb->pipe), 1);
>  +               break;
>  +       case DATA_STAGE:
>  +               if (urb->transfer_buffer_length) {
>  +                       ret = c67x00_add_data_urb(c67x00, urb);
>  +                       if (ret)
>  +                               return ret;
>  +                       break;
>  +               }               /* else fallthrough */
>  +       case STATUS_STAGE:
>  +               pid = !usb_pipeout(urb->pipe) ? USB_PID_OUT : USB_PID_IN;
>  +               ret = c67x00_create_td(c67x00, urb, NULL, 0, pid, 1,
>  +                                      STATUS_STAGE);
>  +               if (ret)
>  +                       return ret;
>  +               break;
>  +       }
>  +
>  +       return 0;
>  +}
>  +
>  +/*
>  + * return 0 in case more bandwidth is available, else errorcode
>  + */
>  +static int c67x00_add_int_urb(struct c67x00_hcd *c67x00, struct urb *urb)
>  +{
>  +       struct c67x00_urb_priv *urbp = urb->hcpriv;
>  +
>  +       if (frame_after_eq(c67x00->current_frame, urbp->ep_data->next_frame)) {
>  +               urbp->ep_data->next_frame =
>  +                   frame_add(urbp->ep_data->next_frame, urb->interval);
>  +               return c67x00_add_data_urb(c67x00, urb);
>  +       }
>  +       return 0;
>  +}
>  +
>  +static int c67x00_add_iso_urb(struct c67x00_hcd *c67x00, struct urb *urb)
>  +{
>  +       struct c67x00_urb_priv *urbp = urb->hcpriv;
>  +
>  +       if (frame_after_eq(c67x00->current_frame, urbp->ep_data->next_frame)) {
>  +               char *td_buf;
>  +               int len, pid, ret;
>  +
>  +               BUG_ON(urbp->cnt >= urb->number_of_packets);
>  +
>  +               td_buf = urb->transfer_buffer +
>  +                   urb->iso_frame_desc[urbp->cnt].offset;
>  +               len = urb->iso_frame_desc[urbp->cnt].length;
>  +               pid = usb_pipeout(urb->pipe) ? USB_PID_OUT : USB_PID_IN;
>  +
>  +               ret = c67x00_create_td(c67x00, urb, td_buf, len, pid, 0,
>  +                                      urbp->cnt);
>  +               if (ret) {
>  +                       printk(KERN_DEBUG "create failed: %d\n", ret);
>  +                       urb->iso_frame_desc[urbp->cnt].actual_length = 0;
>  +                       urb->iso_frame_desc[urbp->cnt].status = ret;
>  +                       if (urbp->cnt + 1 == urb->number_of_packets)
>  +                               c67x00_giveback_urb(c67x00, urb, 0);
>  +               }
>  +
>  +               urbp->ep_data->next_frame =
>  +                   frame_add(urbp->ep_data->next_frame, urb->interval);
>  +               urbp->cnt++;
>  +       }
>  +       return 0;
>  +}
>  +
>  +/* -------------------------------------------------------------------------- */
>  +
>  +static void c67x00_fill_from_list(struct c67x00_hcd *c67x00, int type,
>  +                                 int (*add)(struct c67x00_hcd *, struct urb *))
>  +{
>  +       struct c67x00_ep_data *ep_data;
>  +       struct urb *urb;
>  +
>  +       /* traverse every endpoint on the list */
>  +       list_for_each_entry(ep_data, &c67x00->list[type], node) {
>  +               if (!list_empty(&ep_data->queue)) {
>  +                       /* and add the first urb */
>  +                       /* isochronous transfer rely on this */
>  +                       urb = list_entry(ep_data->queue.next,
>  +                                        struct c67x00_urb_priv,
>  +                                        hep_node)->urb;
>  +                       add(c67x00, urb);
>  +               }
>  +       }
>  +}
>  +
>  +static void c67x00_fill_frame(struct c67x00_hcd *c67x00)
>  +{
>  +       struct c67x00_td *td, *ttd;
>  +
>  +       /* Check if we can proceed */
>  +       if (!list_empty(&c67x00->td_list)) {
>  +               dev_warn(c67x00_hcd_dev(c67x00),
>  +                        "TD list not empty! This should not happen!\n");
>  +               list_for_each_entry_safe(td, ttd, &c67x00->td_list, td_list) {
>  +                       dbg_td(c67x00, td, "Unprocessed td");
>  +                       c67x00_release_td(td);
>  +               }
>  +       }
>  +
>  +       /* Reinitialize variables */
>  +       c67x00->bandwidth_allocated = 0;
>  +       c67x00->periodic_bw_allocated = 0;
>  +
>  +       c67x00->next_td_addr = c67x00->td_base_addr;
>  +       c67x00->next_buf_addr = c67x00->buf_base_addr;
>  +
>  +       /* Fill the list */
>  +       c67x00_fill_from_list(c67x00, PIPE_ISOCHRONOUS, c67x00_add_iso_urb);
>  +       c67x00_fill_from_list(c67x00, PIPE_INTERRUPT, c67x00_add_int_urb);
>  +       c67x00_fill_from_list(c67x00, PIPE_CONTROL, c67x00_add_ctrl_urb);
>  +       c67x00_fill_from_list(c67x00, PIPE_BULK, c67x00_add_data_urb);
>  +}
>  +
>  +/* -------------------------------------------------------------------------- */
>  +
>  +/**
>  + * Get TD from C67X00
>  + */
>  +static inline void
>  +c67x00_parse_td(struct c67x00_hcd *c67x00, struct c67x00_td *td)
>  +{
>  +       c67x00_ll_read_mem_le16(c67x00->sie->dev,
>  +                               td->td_addr, td, CY_TD_SIZE);
>  +
>  +       if (usb_pipein(td->pipe) && td_actual_bytes(td))
>  +               c67x00_ll_read_mem_le16(c67x00->sie->dev, td_ly_base_addr(td),
>  +                                       td->data, td_actual_bytes(td));
>  +}
>  +
>  +static int c67x00_td_to_error(struct c67x00_hcd *c67x00, struct c67x00_td *td)
>  +{
>  +       if (td->status & TD_STATUSMASK_ERR) {
>  +               dbg_td(c67x00, td, "ERROR_FLAG");
>  +               return -EILSEQ;
>  +       }
>  +       if (td->status & TD_STATUSMASK_STALL) {
>  +               /* dbg_td(c67x00, td, "STALL"); */
>  +               return -EPIPE;
>  +       }
>  +       if (td->status & TD_STATUSMASK_TMOUT) {
>  +               dbg_td(c67x00, td, "TIMEOUT");
>  +               return -ETIMEDOUT;
>  +       }
>  +
>  +       return 0;
>  +}
>  +
>  +static inline int c67x00_end_of_data(struct c67x00_td *td)
>  +{
>  +       int maxps, need_empty, remaining;
>  +       struct urb *urb = td->urb;
>  +       int act_bytes;
>  +
>  +       act_bytes = td_actual_bytes(td);
>  +
>  +       if (unlikely(!act_bytes))
>  +               return 1;       /* This was an empty packet */
>  +
>  +       maxps = usb_maxpacket(td_udev(td), td->pipe, usb_pipeout(td->pipe));
>  +
>  +       if (unlikely(act_bytes < maxps))
>  +               return 1;       /* Smaller then full packet */
>  +
>  +       remaining = urb->transfer_buffer_length - urb->actual_length;
>  +       need_empty = (urb->transfer_flags & URB_ZERO_PACKET) &&
>  +           usb_pipeout(urb->pipe) && !(remaining % maxps);
>  +
>  +       if (unlikely(!remaining && !need_empty))
>  +               return 1;
>  +
>  +       return 0;
>  +}
>  +
>  +/* -------------------------------------------------------------------------- */
>  +
>  +/* Remove all td's from the list which come
>  + * after last_td and are meant for the same pipe.
>  + * This is used when a short packet has occured */
>  +static inline void c67x00_clear_pipe(struct c67x00_hcd *c67x00,
>  +                                    struct c67x00_td *last_td)
>  +{
>  +       struct c67x00_td *td, *tmp;
>  +       td = last_td;
>  +       tmp = last_td;
>  +       while (td->td_list.next != &c67x00->td_list) {
>  +               td = list_entry(td->td_list.next, struct c67x00_td, td_list);
>  +               if (td->pipe == last_td->pipe) {
>  +                       c67x00_release_td(td);
>  +                       td = tmp;
>  +               }
>  +               tmp = td;
>  +       }
>  +}
>  +
>  +/* -------------------------------------------------------------------------- */
>  +
>  +static void c67x00_handle_successful_td(struct c67x00_hcd *c67x00,
>  +                                       struct c67x00_td *td)
>  +{
>  +       struct urb *urb = td->urb;
>  +
>  +       if (!urb)
>  +               return;
>  +
>  +       urb->actual_length += td_actual_bytes(td);
>  +
>  +       switch (usb_pipetype(td->pipe)) {
>  +               /* isochronous tds are handled separately */
>  +       case PIPE_CONTROL:
>  +               switch (td->privdata) {
>  +               case SETUP_STAGE:
>  +                       urb->interval =
>  +                           urb->transfer_buffer_length ?
>  +                           DATA_STAGE : STATUS_STAGE;
>  +                       /* Don't count setup_packet with normal data: */
>  +                       urb->actual_length = 0;
>  +                       break;
>  +
>  +               case DATA_STAGE:
>  +                       if (c67x00_end_of_data(td)) {
>  +                               urb->interval = STATUS_STAGE;
>  +                               c67x00_clear_pipe(c67x00, td);
>  +                       }
>  +                       break;
>  +
>  +               case STATUS_STAGE:
>  +                       urb->interval = 0;
>  +                       c67x00_giveback_urb(c67x00, urb, 0);
>  +                       break;
>  +               }
>  +               break;
>  +
>  +       case PIPE_INTERRUPT:
>  +       case PIPE_BULK:
>  +               if (unlikely(c67x00_end_of_data(td))) {
>  +                       c67x00_clear_pipe(c67x00, td);
>  +                       c67x00_giveback_urb(c67x00, urb, 0);
>  +               }
>  +               break;
>  +       }
>  +}
>  +
>  +static void c67x00_handle_isoc(struct c67x00_hcd *c67x00, struct c67x00_td *td)
>  +{
>  +       struct urb *urb = td->urb;
>  +       struct c67x00_urb_priv *urbp;
>  +       int cnt;
>  +
>  +       if (!urb)
>  +               return;
>  +
>  +       urbp = urb->hcpriv;
>  +       cnt = td->privdata;
>  +
>  +       if (td->status & TD_ERROR_MASK)
>  +               urb->error_count++;
>  +
>  +       urb->iso_frame_desc[cnt].actual_length = td_actual_bytes(td);
>  +       urb->iso_frame_desc[cnt].status = c67x00_td_to_error(c67x00, td);
>  +       if (cnt + 1 == urb->number_of_packets)  /* Last packet */
>  +               c67x00_giveback_urb(c67x00, urb, 0);
>  +}
>  +
>  +/* -------------------------------------------------------------------------- */
>  +
>  +/**
>  + * c67x00_check_td_list - handle tds which have been processed by the c67x00
>  + * pre: current_td == 0
>  + */
>  +static inline void c67x00_check_td_list(struct c67x00_hcd *c67x00)
>  +{
>  +       struct c67x00_td *td, *tmp;
>  +       struct urb *urb;
>  +       int ack_ok;
>  +       int clear_endpoint;
>  +
>  +       list_for_each_entry_safe(td, tmp, &c67x00->td_list, td_list) {
>  +               /* get the TD */
>  +               c67x00_parse_td(c67x00, td);
>  +               urb = td->urb;  /* urb can be NULL! */
>  +               ack_ok = 0;
>  +               clear_endpoint = 1;
>  +
>  +               /* Handle isochronous transfers separately */
>  +               if (usb_pipeisoc(td->pipe)) {
>  +                       clear_endpoint = 0;
>  +                       c67x00_handle_isoc(c67x00, td);
>  +                       goto cont;
>  +               }
>  +
>  +               /* When an error occurs, all td's for that pipe go into an
>  +                * inactive state. This state matches successful transfers so
>  +                * we must make sure not to service them. */
>  +               if (td->status & TD_ERROR_MASK) {
>  +                       c67x00_giveback_urb(c67x00, urb,
>  +                                           c67x00_td_to_error(c67x00, td));
>  +                       goto cont;
>  +               }
>  +
>  +               if ((td->status & TD_STATUSMASK_NAK) || !td_sequence_ok(td) ||
>  +                   !td_acked(td))
>  +                       goto cont;
>  +
>  +               /* Sequence ok and acked, don't need to fix toggle */
>  +               ack_ok = 1;
>  +
>  +               if (unlikely(td->status & TD_STATUSMASK_OVF)) {
>  +                       if (td_residue(td) & TD_RESIDUE_OVERFLOW) {
>  +                               /* Overflow */
>  +                               c67x00_giveback_urb(c67x00, urb, -EOVERFLOW);
>  +                               goto cont;
>  +                       }
>  +               }
>  +
>  +               clear_endpoint = 0;
>  +               c67x00_handle_successful_td(c67x00, td);
>  +
>  +cont:
>  +               if (clear_endpoint)
>  +                       c67x00_clear_pipe(c67x00, td);
>  +               if (ack_ok)
>  +                       usb_settoggle(td_udev(td), usb_pipeendpoint(td->pipe),
>  +                                     usb_pipeout(td->pipe),
>  +                                     !(td->ctrl_reg & SEQ_SEL));
>  +               /* next in list could have been removed, due to clear_pipe! */
>  +               tmp = list_entry(td->td_list.next, typeof(*td), td_list);
>  +               c67x00_release_td(td);
>  +       }
>  +}
>  +
>  +/* -------------------------------------------------------------------------- */
>  +
>  +static inline int c67x00_all_tds_processed(struct c67x00_hcd *c67x00)
>  +{
>  +       /* If all tds are processed, we can check the previous frame (if
>  +        * there was any) and start our next frame.
>  +        */
>  +       return !c67x00_ll_husb_get_current_td(c67x00->sie);
>  +}
>  +
>  +/**
>  + * Send td to C67X00
>  + */
>  +static void c67x00_send_td(struct c67x00_hcd *c67x00, struct c67x00_td *td)
>  +{
>  +       int len = td_length(td);
>  +
>  +       if (len && ((td->pid_ep & TD_PIDEPMASK_PID) != TD_PID_IN))
>  +               c67x00_ll_write_mem_le16(c67x00->sie->dev, td_ly_base_addr(td),
>  +                                        td->data, len);
>  +
>  +       c67x00_ll_write_mem_le16(c67x00->sie->dev,
>  +                                td->td_addr, td, CY_TD_SIZE);
>  +}
>  +
>  +static void c67x00_send_frame(struct c67x00_hcd *c67x00)
>  +{
>  +       struct c67x00_td *td;
>  +
>  +       if (list_empty(&c67x00->td_list))
>  +               dev_warn(c67x00_hcd_dev(c67x00),
>  +                        "%s: td list should not be empty here!\n",
>  +                        __func__);
>  +
>  +       list_for_each_entry(td, &c67x00->td_list, td_list) {
>  +               if (td->td_list.next == &c67x00->td_list)
>  +                       td->next_td_addr = 0;   /* Last td in list */
>  +
>  +               c67x00_send_td(c67x00, td);
>  +       }
>  +
>  +       c67x00_ll_husb_set_current_td(c67x00->sie, c67x00->td_base_addr);
>  +}
>  +
>  +/* -------------------------------------------------------------------------- */
>  +
>  +/**
>  + * c67x00_do_work - Schedulers state machine
>  + */
>  +static void c67x00_do_work(struct c67x00_hcd *c67x00)
>  +{
>  +       spin_lock(&c67x00->lock);
>  +       /* Make sure all tds are processed */
>  +       if (!c67x00_all_tds_processed(c67x00))
>  +               goto out;
>  +
>  +       c67x00_check_td_list(c67x00);
>  +
>  +       /* no td's are being processed (current == 0)
>  +        * and all have been "checked" */
>  +       complete(&c67x00->endpoint_disable);
>  +
>  +       if (!list_empty(&c67x00->td_list))
>  +               goto out;
>  +
>  +       c67x00->current_frame = c67x00_get_current_frame_number(c67x00);
>  +       if (c67x00->current_frame == c67x00->last_frame)
>  +               goto out;       /* Don't send tds in same frame */
>  +       c67x00->last_frame = c67x00->current_frame;
>  +
>  +       /* If no urbs are scheduled, our work is done */
>  +       if (!c67x00->urb_count) {
>  +               c67x00_ll_hpi_disable_sofeop(c67x00->sie);
>  +               goto out;
>  +       }
>  +
>  +       c67x00_fill_frame(c67x00);
>  +       if (!list_empty(&c67x00->td_list))
>  +               /* TD's have been added to the frame */
>  +               c67x00_send_frame(c67x00);
>  +
>  + out:
>  +       spin_unlock(&c67x00->lock);
>  +}
>  +
>  +/* -------------------------------------------------------------------------- */
>  +
>  +static void c67x00_sched_tasklet(unsigned long __c67x00)
>  +{
>  +       struct c67x00_hcd *c67x00 = (struct c67x00_hcd *)__c67x00;
>  +       c67x00_do_work(c67x00);
>  +}
>  +
>  +void c67x00_sched_kick(struct c67x00_hcd *c67x00)
>  +{
>  +       tasklet_hi_schedule(&c67x00->tasklet);
>  +}
>  +
>  +int c67x00_sched_start_scheduler(struct c67x00_hcd *c67x00)
>  +{
>  +       tasklet_init(&c67x00->tasklet, c67x00_sched_tasklet,
>  +                    (unsigned long)c67x00);
>  +       return 0;
>  +}
>  +
>  +void c67x00_sched_stop_scheduler(struct c67x00_hcd *c67x00)
>  +{
>  +       tasklet_kill(&c67x00->tasklet);
>  +}
>  Index: linux-2.6/drivers/usb/c67x00/Makefile
>  ===================================================================
>  --- /dev/null
>  +++ linux-2.6/drivers/usb/c67x00/Makefile
>  @@ -0,0 +1,9 @@
>  +#
>  +# Makefile for Cypress C67X00 USB Controller
>  +#
>  +
>  +ccflags-$(CONFIG_USB_DEBUG)            += -DDEBUG
>  +
>  +obj-$(CONFIG_USB_C67X00_HCD)           += c67x00.o
>  +
>  +c67x00-objs := c67x00-drv.o c67x00-ll-hpi.o c67x00-hcd.o c67x00-sched.o
>  Index: linux-2.6/drivers/usb/Makefile
>  ===================================================================
>  --- linux-2.6.orig/drivers/usb/Makefile
>  +++ linux-2.6/drivers/usb/Makefile
>  @@ -17,6 +17,8 @@
>   obj-$(CONFIG_USB_U132_HCD)     += host/
>   obj-$(CONFIG_USB_R8A66597_HCD) += host/
>
>  +obj-$(CONFIG_USB_C67X00_HCD)   += c67x00/
>  +
>   obj-$(CONFIG_USB_ACM)          += class/
>   obj-$(CONFIG_USB_PRINTER)      += class/
>
>  Index: linux-2.6/drivers/usb/c67x00/c67x00-drv.c
>  ===================================================================
>  --- linux-2.6.orig/drivers/usb/c67x00/c67x00-drv.c
>  +++ linux-2.6/drivers/usb/c67x00/c67x00-drv.c
>  @@ -41,6 +41,7 @@
>   #include <linux/usb/c67x00.h>
>
>   #include "c67x00.h"
>  +#include "c67x00-hcd.h"
>
>   static void c67x00_probe_sie(struct c67x00_sie *sie,
>                              struct c67x00_device *dev, int sie_num)
>  @@ -51,6 +52,10 @@
>         sie->mode = c67x00_sie_config(dev->pdata->sie_config, sie_num);
>
>         switch (sie->mode) {
>  +       case C67X00_SIE_HOST:
>  +               c67x00_hcd_probe(sie);
>  +               break;
>  +
>         case C67X00_SIE_UNUSED:
>                 dev_info(sie_dev(sie),
>                          "Not using SIE %d as requested\n", sie->sie_num);
>  @@ -66,6 +71,14 @@
>
>   static void c67x00_remove_sie(struct c67x00_sie *sie)
>   {
>  +       switch (sie->mode) {
>  +       case C67X00_SIE_HOST:
>  +               c67x00_hcd_remove(sie);
>  +               break;
>  +
>  +       default:
>  +               break;
>  +       }
>   }
>
>   static irqreturn_t c67x00_irq(int irq, void *__dev)
>  Index: linux-2.6/drivers/usb/c67x00/c67x00.h
>  ===================================================================
>  --- linux-2.6.orig/drivers/usb/c67x00/c67x00.h
>  +++ linux-2.6/drivers/usb/c67x00/c67x00.h
>  @@ -274,6 +274,15 @@
>   void c67x00_ll_read_mem_le16(struct c67x00_device *dev, u16 addr,
>                              void *data, int len);
>
>  +/* Host specific functions */
>  +void c67x00_ll_set_husb_eot(struct c67x00_device *dev, u16 value);
>  +void c67x00_ll_husb_reset(struct c67x00_sie *sie, int port);
>  +void c67x00_ll_husb_set_current_td(struct c67x00_sie *sie, u16 addr);
>  +u16 c67x00_ll_husb_get_current_td(struct c67x00_sie *sie);
>  +u16 c67x00_ll_husb_get_frame(struct c67x00_sie *sie);
>  +void c67x00_ll_husb_init_host_port(struct c67x00_sie *sie);
>  +void c67x00_ll_husb_reset_port(struct c67x00_sie *sie, int port);
>  +
>   /* Called by c67x00_irq to handle lcp interrupts */
>   void c67x00_ll_irq(struct c67x00_device *dev, u16 int_status);
>
>  Index: linux-2.6/drivers/usb/c67x00/c67x00-ll-hpi.c
>  ===================================================================
>  --- linux-2.6.orig/drivers/usb/c67x00/c67x00-ll-hpi.c
>  +++ linux-2.6/drivers/usb/c67x00/c67x00-ll-hpi.c
>  @@ -297,6 +297,81 @@
>   }
>
>   /* -------------------------------------------------------------------------- */
>  +/* Host specific functions */
>  +
>  +void c67x00_ll_set_husb_eot(struct c67x00_device *dev, u16 value)
>  +{
>  +       mutex_lock(&dev->hpi.lcp.mutex);
>  +       hpi_write_word(dev, HUSB_pEOT, value);
>  +       mutex_unlock(&dev->hpi.lcp.mutex);
>  +}
>  +
>  +static inline void c67x00_ll_husb_sie_init(struct c67x00_sie *sie)
>  +{
>  +       struct c67x00_device *dev = sie->dev;
>  +       struct c67x00_lcp_int_data data;
>  +       int rc;
>  +
>  +       rc = c67x00_comm_exec_int(dev, HUSB_SIE_INIT_INT(sie->sie_num), &data);
>  +       BUG_ON(rc); /* No return path for error code; crash spectacularly */
>  +}
>  +
>  +void c67x00_ll_husb_reset(struct c67x00_sie *sie, int port)
>  +{
>  +       struct c67x00_device *dev = sie->dev;
>  +       struct c67x00_lcp_int_data data;
>  +       int rc;
>  +
>  +       data.regs[0] = 50;      /* Reset USB port for 50ms */
>  +       data.regs[1] = port | (sie->sie_num << 1);
>  +       rc = c67x00_comm_exec_int(dev, HUSB_RESET_INT, &data);
>  +       BUG_ON(rc); /* No return path for error code; crash spectacularly */
>  +}
>  +
>  +void c67x00_ll_husb_set_current_td(struct c67x00_sie *sie, u16 addr)
>  +{
>  +       hpi_write_word(sie->dev, HUSB_SIE_pCurrentTDPtr(sie->sie_num), addr);
>  +}
>  +
>  +u16 c67x00_ll_husb_get_current_td(struct c67x00_sie *sie)
>  +{
>  +       return hpi_read_word(sie->dev, HUSB_SIE_pCurrentTDPtr(sie->sie_num));
>  +}
>  +
>  +u16 c67x00_ll_husb_get_frame(struct c67x00_sie *sie)
>  +{
>  +       return hpi_read_word(sie->dev, HOST_FRAME_REG(sie->sie_num));
>  +}
>  +
>  +void c67x00_ll_husb_init_host_port(struct c67x00_sie *sie)
>  +{
>  +       /* Set port into host mode */
>  +       hpi_set_bits(sie->dev, USB_CTL_REG(sie->sie_num), HOST_MODE);
>  +       c67x00_ll_husb_sie_init(sie);
>  +       /* Clear interrupts */
>  +       c67x00_ll_usb_clear_status(sie, HOST_STAT_MASK);
>  +       /* Check */
>  +       if (!(hpi_read_word(sie->dev, USB_CTL_REG(sie->sie_num)) & HOST_MODE))
>  +               dev_warn(sie_dev(sie),
>  +                        "SIE %d not set to host mode\n", sie->sie_num);
>  +}
>  +
>  +void c67x00_ll_husb_reset_port(struct c67x00_sie *sie, int port)
>  +{
>  +       /* Clear connect change */
>  +       c67x00_ll_usb_clear_status(sie, PORT_CONNECT_CHANGE(port));
>  +
>  +       /* Enable interrupts */
>  +       hpi_set_bits(sie->dev, HPI_IRQ_ROUTING_REG,
>  +                    SOFEOP_TO_CPU_EN(sie->sie_num));
>  +       hpi_set_bits(sie->dev, HOST_IRQ_EN_REG(sie->sie_num),
>  +                    SOF_EOP_IRQ_EN | DONE_IRQ_EN);
>  +
>  +       /* Enable pull down transistors */
>  +       hpi_set_bits(sie->dev, USB_CTL_REG(sie->sie_num), PORT_RES_EN(port));
>  +}
>  +
>  +/* -------------------------------------------------------------------------- */
>
>   void c67x00_ll_irq(struct c67x00_device *dev, u16 int_status)
>   {
>  Index: linux-2.6/drivers/usb/host/Kconfig
>  ===================================================================
>  --- linux-2.6.orig/drivers/usb/host/Kconfig
>  +++ linux-2.6/drivers/usb/host/Kconfig
>  @@ -4,6 +4,19 @@
>   comment "USB Host Controller Drivers"
>         depends on USB
>
>  +config USB_C67X00_HCD
>  +       tristate "Cypress C67x00 HCD support"
>  +       depends on USB
>  +       help
>  +         The Cypress C67x00 (EZ-Host/EZ-OTG) chips are dual-role
>  +         host/peripheral/OTG USB controllers.
>  +
>  +         Enable this option to support this chip in host controller mode.
>  +         If unsure, say N.
>  +
>  +         To compile this driver as a module, choose M here: the
>  +         module will be called c67x00.
>  +
>   config USB_EHCI_HCD
>         tristate "EHCI HCD (USB 2.0) support"
>         depends on USB && USB_ARCH_HAS_EHCI
>
>  --
>  Bye, Peter Korsgaard
>



-- 
Grant Likely, B.Sc., P.Eng.
Secret Lab Technologies Ltd.



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