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* (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.
*/
#include <linux/config.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/pci.h>
#include <asm/io.h>
#include <asm/irq.h>
#ifdef CONFIG_USB_DEBUG
#define DEBUG
#else
#undef DEBUG
#endif
#include <linux/usb.h>
#include "hcd.h"
/* 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;
u8 latency, limit;
struct usb_hcd *hcd;
int retval, region;
char buf [8], *bufp = buf;
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;
info ("%s @ %s, %s", hcd->description, dev->slot_name, dev->name);
pci_read_config_byte (dev, PCI_LATENCY_TIMER, &latency);
if (latency) {
pci_read_config_byte (dev, PCI_MAX_LAT, &limit);
if (limit && limit < latency) {
dbg ("PCI latency reduced to max %d", limit);
pci_write_config_byte (dev, PCI_LATENCY_TIMER, limit);
}
}
#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) {
err ("request interrupt %s failed", bufp);
retval = -EBUSY;
driver->hcd_free (hcd);
goto clean_2;
}
hcd->irq = dev->irq;
hcd->regs = base;
hcd->region = region;
info ("irq %s, %s %p", 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;
hcd->self.bus_name = dev->slot_name;
hcd->product_desc = dev->name;
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;
info ("remove: %s, state %x", hcd->self.bus_name, hcd->state);
if (in_interrupt ()) BUG ();
hub = hcd->self.root_hub;
hcd->state = USB_STATE_QUIESCING;
dbg ("%s: roothub graceful disconnect", hcd->self.bus_name);
usb_disconnect (&hub);
hcd->driver->stop (hcd);
hcd->state = USB_STATE_HALT;
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)
err ("usb_hcd_pci_remove %s, count != 1", hcd->self.bus_name);
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);
info ("suspend %s to state %d", hcd->self.bus_name, 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);
info ("resume %s", hcd->self.bus_name);
/* guard against multiple resumes (APM bug?) */
atomic_inc (&hcd->resume_count);
if (atomic_read (&hcd->resume_count) != 1) {
err ("concurrent PCI resumes for %s", hcd->self.bus_name);
retval = 0;
goto done;
}
retval = -EBUSY;
if (hcd->state != USB_STATE_SUSPENDED) {
dbg ("can't resume, not suspended!");
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)) {
dbg ("resume %s failure, retval %d", hcd->self.bus_name, 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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