linux-sg2042/drivers/usb/core/hcd-pci.c

359 lines
9.0 KiB
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.
*/
#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"
/* 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;
struct usb_hcd *hcd;
int retval;
if (usb_disabled())
return -ENODEV;
if (!id || !(driver = (struct hc_driver *) id->driver_data))
return -EINVAL;
if (pci_enable_device (dev) < 0)
return -ENODEV;
dev->current_state = 0;
dev->dev.power.power_state = 0;
if (!dev->irq) {
dev_err (&dev->dev,
"Found HC with no IRQ. Check BIOS/PCI %s setup!\n",
pci_name(dev));
retval = -ENODEV;
goto err1;
}
hcd = usb_create_hcd (driver, &dev->dev, pci_name(dev));
if (!hcd) {
retval = -ENOMEM;
goto err1;
}
if (driver->flags & HCD_MEMORY) { // EHCI, OHCI
hcd->rsrc_start = pci_resource_start (dev, 0);
hcd->rsrc_len = pci_resource_len (dev, 0);
if (!request_mem_region (hcd->rsrc_start, hcd->rsrc_len,
driver->description)) {
dev_dbg (&dev->dev, "controller already in use\n");
retval = -EBUSY;
goto err2;
}
hcd->regs = ioremap_nocache (hcd->rsrc_start, hcd->rsrc_len);
if (hcd->regs == NULL) {
dev_dbg (&dev->dev, "error mapping memory\n");
retval = -EFAULT;
goto err3;
}
} else { // UHCI
int region;
for (region = 0; region < PCI_ROM_RESOURCE; region++) {
if (!(pci_resource_flags (dev, region) &
IORESOURCE_IO))
continue;
hcd->rsrc_start = pci_resource_start (dev, region);
hcd->rsrc_len = pci_resource_len (dev, region);
if (request_region (hcd->rsrc_start, hcd->rsrc_len,
driver->description))
break;
}
if (region == PCI_ROM_RESOURCE) {
dev_dbg (&dev->dev, "no i/o regions available\n");
retval = -EBUSY;
goto err1;
}
}
#ifdef CONFIG_PCI_NAMES
hcd->product_desc = dev->pretty_name;
#endif
pci_set_master (dev);
retval = usb_add_hcd (hcd, dev->irq, SA_SHIRQ);
if (retval != 0)
goto err4;
return retval;
err4:
if (driver->flags & HCD_MEMORY) {
iounmap (hcd->regs);
err3:
release_mem_region (hcd->rsrc_start, hcd->rsrc_len);
} else
release_region (hcd->rsrc_start, hcd->rsrc_len);
err2:
usb_put_hcd (hcd);
err1:
pci_disable_device (dev);
dev_err (&dev->dev, "init %s fail, %d\n", pci_name(dev), retval);
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;
hcd = pci_get_drvdata(dev);
if (!hcd)
return;
usb_remove_hcd (hcd);
if (hcd->driver->flags & HCD_MEMORY) {
iounmap (hcd->regs);
release_mem_region (hcd->rsrc_start, hcd->rsrc_len);
} else {
release_region (hcd->rsrc_start, hcd->rsrc_len);
}
usb_put_hcd (hcd);
pci_disable_device(dev);
}
EXPORT_SYMBOL (usb_hcd_pci_remove);
#ifdef CONFIG_PM
static char __attribute_used__ *pci_state(u32 state)
{
switch (state) {
case 0: return "D0";
case 1: return "D1";
case 2: return "D2";
case 3: return "D3hot";
case 4: return "D3cold";
}
return NULL;
}
/**
* usb_hcd_pci_suspend - power management suspend of a PCI-based HCD
* @dev: USB Host Controller being suspended
* @state: state that the controller is going into
*
* 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 = 0;
int has_pci_pm;
hcd = pci_get_drvdata(dev);
/* even when the PCI layer rejects some of the PCI calls
* below, HCs can try global suspend and reduce DMA traffic.
* PM-sensitive HCDs may already have done this.
*/
has_pci_pm = pci_find_capability(dev, PCI_CAP_ID_PM);
if (state > 4)
state = 4;
switch (hcd->state) {
/* entry if root hub wasn't yet suspended ... from sysfs,
* without autosuspend, or if USB_SUSPEND isn't configured.
*/
case HC_STATE_RUNNING:
hcd->state = HC_STATE_QUIESCING;
retval = hcd->driver->suspend (hcd, state);
if (retval) {
dev_dbg (hcd->self.controller,
"suspend fail, retval %d\n",
retval);
break;
}
hcd->state = HC_STATE_SUSPENDED;
/* FALLTHROUGH */
/* entry with CONFIG_USB_SUSPEND, or hcds that autosuspend: the
* controller and/or root hub will already have been suspended,
* but it won't be ready for a PCI resume call.
*
* FIXME only CONFIG_USB_SUSPEND guarantees hub_suspend() will
* have been called, otherwise root hub timers still run ...
*/
case HC_STATE_SUSPENDED:
if (state <= dev->current_state)
break;
/* no DMA or IRQs except in D0 */
if (!dev->current_state) {
pci_save_state (dev);
pci_disable_device (dev);
free_irq (hcd->irq, hcd);
}
if (!has_pci_pm) {
dev_dbg (hcd->self.controller, "--> PCI D0/legacy\n");
break;
}
/* POLICY: ignore D1/D2/D3hot differences;
* we know D3hot will always work.
*/
retval = pci_set_power_state (dev, state);
if (retval < 0 && state < 3) {
retval = pci_set_power_state (dev, 3);
if (retval == 0)
state = 3;
}
if (retval == 0) {
dev_dbg (hcd->self.controller, "--> PCI %s\n",
pci_state(dev->current_state));
#ifdef CONFIG_USB_SUSPEND
pci_enable_wake (dev, state, hcd->remote_wakeup);
pci_enable_wake (dev, 4, hcd->remote_wakeup);
#endif
} else if (retval < 0) {
dev_dbg (&dev->dev, "PCI %s suspend fail, %d\n",
pci_state(state), retval);
(void) usb_hcd_pci_resume (dev);
break;
}
break;
default:
dev_dbg (hcd->self.controller, "hcd state %d; not suspended\n",
hcd->state);
retval = -EINVAL;
break;
}
/* update power_state **ONLY** to make sysfs happier */
if (retval == 0)
dev->dev.power.power_state = 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;
int has_pci_pm;
hcd = pci_get_drvdata(dev);
if (hcd->state != HC_STATE_SUSPENDED) {
dev_dbg (hcd->self.controller,
"can't resume, not suspended!\n");
return 0;
}
has_pci_pm = pci_find_capability(dev, PCI_CAP_ID_PM);
/* D3cold resume isn't usually reported this way... */
dev_dbg(hcd->self.controller, "resume from PCI %s%s\n",
pci_state(dev->current_state),
has_pci_pm ? "" : " (legacy)");
hcd->state = HC_STATE_RESUMING;
if (has_pci_pm)
pci_set_power_state (dev, 0);
dev->dev.power.power_state = 0;
retval = request_irq (dev->irq, usb_hcd_irq, SA_SHIRQ,
hcd->driver->description, hcd);
if (retval < 0) {
dev_err (hcd->self.controller,
"can't restore IRQ after resume!\n");
return retval;
}
hcd->saw_irq = 0;
pci_restore_state (dev);
#ifdef CONFIG_USB_SUSPEND
pci_enable_wake (dev, dev->current_state, 0);
pci_enable_wake (dev, 4, 0);
#endif
retval = hcd->driver->resume (hcd);
if (!HC_IS_RUNNING (hcd->state)) {
dev_dbg (hcd->self.controller,
"resume fail, retval %d\n", retval);
usb_hc_died (hcd);
}
return retval;
}
EXPORT_SYMBOL (usb_hcd_pci_resume);
#endif /* CONFIG_PM */