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hcd-pci.c

/*
 * (C) Copyright David Brownell 2000-2002
 * 
 * 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., 675 Mass Ave, Cambridge, MA 02139, USA.
 */

#if 0
#include <linux/config.h>

#ifdef CONFIG_USB_DEBUG
      #define DEBUG
#else
      #undef DEBUG
#endif

#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/pci.h>
#include <asm/io.h>
#include <asm/irq.h>
#include <linux/usb.h>
#include "hcd.h"
#else
#define DEBUG
#include "../usb_wrapper.h"
#include "hcd.h"
#endif


/* PCI-based HCs are normal, but custom bus glue should be ok */


/*-------------------------------------------------------------------------*/

/* configure so an HC device and id are always provided */
/* always called with process context; sleeping is OK */

/**
 * usb_hcd_pci_probe - initialize PCI-based HCDs
 * @dev: USB Host Controller being probed
 * @id: pci hotplug id connecting controller to HCD framework
 * Context: !in_interrupt()
 *
 * Allocates basic PCI resources for this USB host controller, and
 * then invokes the start() method for the HCD associated with it
 * through the hotplug entry's driver_data.
 *
 * Store this function in the HCD's struct pci_driver as probe().
 */
int usb_hcd_pci_probe (struct pci_dev *dev, const struct pci_device_id *id)
{
      struct hc_driver  *driver;
      unsigned long           resource, len;
      void              *base;
      struct usb_hcd          *hcd;
      int               retval, region;
      char              buf [8];
      //char                  *bufp = buf;

      if (usb_disabled())
            return -ENODEV;

      if (!id || !(driver = (struct hc_driver *) id->driver_data))
            return -EINVAL;

      if (pci_enable_device (dev) < 0)
            return -ENODEV;

        if (!dev->irq) {
            err ("Found HC with no IRQ.  Check BIOS/PCI %s setup!",
                  dev->slot_name);
              return -ENODEV;
        }

      if (driver->flags & HCD_MEMORY) {   // EHCI, OHCI
            region = 0;
            resource = pci_resource_start (dev, 0);
            len = pci_resource_len (dev, 0);
            if (!request_mem_region (resource, len, driver->description)) {
                  dbg ("controller already in use");
                  return -EBUSY;
            }
            base = ioremap_nocache (resource, len);
            if (base == NULL) {
                  dbg ("error mapping memory");
                  retval = -EFAULT;
clean_1:
                  release_mem_region (resource, len);
                  err ("init %s fail, %d", dev->slot_name, retval);
                  return retval;
            }

      } else {                      // UHCI
            resource = len = 0;
            for (region = 0; region < PCI_ROM_RESOURCE; region++) {
                  if (!(pci_resource_flags (dev, region) & IORESOURCE_IO))
                        continue;

                  resource = pci_resource_start (dev, region);
                  len = pci_resource_len (dev, region);
                  if (request_region (resource, len,
                              driver->description))
                        break;
            }
            if (region == PCI_ROM_RESOURCE) {
                  dbg ("no i/o regions available");
                  return -EBUSY;
            }
            base = (void *) resource;
      }

      // driver->start(), later on, will transfer device from
      // control by SMM/BIOS to control by Linux (if needed)

      pci_set_master (dev);

      hcd = driver->hcd_alloc ();
      if (hcd == NULL){
            dbg ("hcd alloc fail");
            retval = -ENOMEM;
clean_2:
            if (driver->flags & HCD_MEMORY) {
                  iounmap (base);
                  goto clean_1;
            } else {
                  release_region (resource, len);
                  err ("init %s fail, %d", dev->slot_name, retval);
                  return retval;
            }
      }
      pci_set_drvdata (dev, hcd);
      hcd->driver = driver;
      hcd->description = driver->description;
      hcd->pdev = dev;
      hcd->self.bus_name = dev->slot_name;
      hcd->product_desc = dev->dev.name;
      hcd->self.controller = &dev->dev;
      hcd->controller = hcd->self.controller;

      if ((retval = hcd_buffer_create (hcd)) != 0) {
clean_3:
            driver->hcd_free (hcd);
            goto clean_2;
      }

      dev_info (hcd->controller, "%s\n", hcd->product_desc);

#ifndef __sparc__
      sprintf (buf, "%d", dev->irq);
#else
      bufp = __irq_itoa(dev->irq);
#endif
      if (request_irq (dev->irq, usb_hcd_irq, SA_SHIRQ, hcd->description, hcd)
                  != 0) {
            dev_err (hcd->controller,
                        "request interrupt %s failed\n", bufp);
            retval = -EBUSY;
            goto clean_3;
      }
      hcd->irq = dev->irq;

      hcd->regs = base;
      hcd->region = region;
      dev_info (hcd->controller, "irq %s, %s %p\n", bufp,
            (driver->flags & HCD_MEMORY) ? "pci mem" : "io base",
            base);

      usb_bus_init (&hcd->self);
      hcd->self.op = &usb_hcd_operations;
      hcd->self.hcpriv = (void *) hcd;

      INIT_LIST_HEAD (&hcd->dev_list);

      usb_register_bus (&hcd->self);

      if ((retval = driver->start (hcd)) < 0)
            usb_hcd_pci_remove (dev);

      return retval;
} 
EXPORT_SYMBOL (usb_hcd_pci_probe);


/* may be called without controller electrically present */
/* may be called with controller, bus, and devices active */

/**
 * usb_hcd_pci_remove - shutdown processing for PCI-based HCDs
 * @dev: USB Host Controller being removed
 * Context: !in_interrupt()
 *
 * Reverses the effect of usb_hcd_pci_probe(), first invoking
 * the HCD's stop() method.  It is always called from a thread
 * context, normally "rmmod", "apmd", or something similar.
 *
 * Store this function in the HCD's struct pci_driver as remove().
 */
void usb_hcd_pci_remove (struct pci_dev *dev)
{
      struct usb_hcd          *hcd;
      struct usb_device *hub;

      hcd = pci_get_drvdata(dev);
      if (!hcd)
            return;
      dev_info (hcd->controller, "remove, state %x\n", hcd->state);

      if (in_interrupt ())
            BUG ();

      hub = hcd->self.root_hub;
      hcd->state = USB_STATE_QUIESCING;

      dev_dbg (hcd->controller, "roothub graceful disconnect\n");
      usb_disconnect (&hub);

      hcd->driver->stop (hcd);
      hcd_buffer_destroy (hcd);
      hcd->state = USB_STATE_HALT;
      pci_set_drvdata (dev, 0);

      free_irq (hcd->irq, hcd);
      if (hcd->driver->flags & HCD_MEMORY) {
            iounmap (hcd->regs);
            release_mem_region (pci_resource_start (dev, 0),
                  pci_resource_len (dev, 0));
      } else {
            release_region (pci_resource_start (dev, hcd->region),
                  pci_resource_len (dev, hcd->region));
      }

      usb_deregister_bus (&hcd->self);
      if (atomic_read (&hcd->self.refcnt) != 1) {
            dev_warn (hcd->controller,
                  "dangling refs (%d) to bus %d!\n",
                  atomic_read (&hcd->self.refcnt) - 1,
                  hcd->self.busnum);
      }
      hcd->driver->hcd_free (hcd);
}
EXPORT_SYMBOL (usb_hcd_pci_remove);


#ifdef      CONFIG_PM

/*
 * Some "sleep" power levels imply updating struct usb_driver
 * to include a callback asking hcds to do their bit by checking
 * if all the drivers can suspend.  Gets involved with remote wakeup.
 *
 * If there are pending urbs, then HCs will need to access memory,
 * causing extra power drain.  New sleep()/wakeup() PM calls might
 * be needed, beyond PCI suspend()/resume().  The root hub timer
 * still be accessing memory though ...
 *
 * FIXME:  USB should have some power budgeting support working with
 * all kinds of hubs.
 *
 * FIXME:  This assumes only D0->D3 suspend and D3->D0 resume.
 * D1 and D2 states should do something, yes?
 *
 * FIXME:  Should provide generic enable_wake(), calling pci_enable_wake()
 * for all supported states, so that USB remote wakeup can work for any
 * devices that support it (and are connected via powered hubs).
 *
 * FIXME:  resume doesn't seem to work right any more...
 */


// 2.4 kernels have issued concurrent resumes (w/APM)
// we defend against that error; PCI doesn't yet.

/**
 * usb_hcd_pci_suspend - power management suspend of a PCI-based HCD
 * @dev: USB Host Controller being suspended
 *
 * Store this function in the HCD's struct pci_driver as suspend().
 */
int usb_hcd_pci_suspend (struct pci_dev *dev, u32 state)
{
      struct usb_hcd          *hcd;
      int               retval;

      hcd = pci_get_drvdata(dev);
      dev_info (hcd->controller, "suspend to state %d\n", state);

      pci_save_state (dev, hcd->pci_state);

      // FIXME for all connected devices, leaf-to-root:
      // driver->suspend()
      // proposed "new 2.5 driver model" will automate that

      /* driver may want to disable DMA etc */
      retval = hcd->driver->suspend (hcd, state);
      hcd->state = USB_STATE_SUSPENDED;

      pci_set_power_state (dev, state);
      return retval;
}
EXPORT_SYMBOL (usb_hcd_pci_suspend);

/**
 * usb_hcd_pci_resume - power management resume of a PCI-based HCD
 * @dev: USB Host Controller being resumed
 *
 * Store this function in the HCD's struct pci_driver as resume().
 */
int usb_hcd_pci_resume (struct pci_dev *dev)
{
      struct usb_hcd          *hcd;
      int               retval;

      hcd = pci_get_drvdata(dev);
      dev_info (hcd->controller, "resume\n");

      /* guard against multiple resumes (APM bug?) */
      atomic_inc (&hcd->resume_count);
      if (atomic_read (&hcd->resume_count) != 1) {
            dev_err (hcd->controller, "concurrent PCI resumes\n");
            retval = 0;
            goto done;
      }

      retval = -EBUSY;
      if (hcd->state != USB_STATE_SUSPENDED) {
            dev_dbg (hcd->controller, "can't resume, not suspended!\n");
            goto done;
      }
      hcd->state = USB_STATE_RESUMING;

      pci_set_power_state (dev, 0);
      pci_restore_state (dev, hcd->pci_state);

      retval = hcd->driver->resume (hcd);
      if (!HCD_IS_RUNNING (hcd->state)) {
            dev_dbg (hcd->controller, "resume fail, retval %d\n", retval);
            usb_hc_died (hcd);
// FIXME:  recover, reset etc.
      } else {
            // FIXME for all connected devices, root-to-leaf:
            // driver->resume ();
            // proposed "new 2.5 driver model" will automate that
      }

done:
      atomic_dec (&hcd->resume_count);
      return retval;
}
EXPORT_SYMBOL (usb_hcd_pci_resume);

#endif      /* CONFIG_PM */



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