390 lines
11 KiB
C
390 lines
11 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 common, but plenty of non-PCI HCs are used too */
|
|
|
|
|
|
/*-------------------------------------------------------------------------*/
|
|
|
|
/* 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 = PCI_D0;
|
|
dev->dev.power.power_state = PMSG_ON;
|
|
|
|
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
|
|
|
|
/**
|
|
* usb_hcd_pci_suspend - power management suspend of a PCI-based HCD
|
|
* @dev: USB Host Controller being suspended
|
|
* @message: semantics in flux
|
|
*
|
|
* Store this function in the HCD's struct pci_driver as suspend().
|
|
*/
|
|
int usb_hcd_pci_suspend (struct pci_dev *dev, pm_message_t message)
|
|
{
|
|
struct usb_hcd *hcd;
|
|
int retval = 0;
|
|
int has_pci_pm;
|
|
|
|
hcd = pci_get_drvdata(dev);
|
|
|
|
/* FIXME until the generic PM interfaces change a lot more, this
|
|
* can't use PCI D1 and D2 states. For example, the confusion
|
|
* between messages and states will need to vanish, and messages
|
|
* will need to provide a target system state again.
|
|
*
|
|
* It'll be important to learn characteristics of the target state,
|
|
* especially on embedded hardware where the HCD will often be in
|
|
* charge of an external VBUS power supply and one or more clocks.
|
|
* Some target system states will leave them active; others won't.
|
|
* (With PCI, that's often handled by platform BIOS code.)
|
|
*/
|
|
|
|
/* 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);
|
|
|
|
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, message);
|
|
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:
|
|
/* no DMA or IRQs except when HC is active */
|
|
if (dev->current_state == PCI_D0) {
|
|
free_irq (hcd->irq, hcd);
|
|
pci_save_state (dev);
|
|
pci_disable_device (dev);
|
|
}
|
|
|
|
if (!has_pci_pm) {
|
|
dev_dbg (hcd->self.controller, "--> PCI D0/legacy\n");
|
|
break;
|
|
}
|
|
|
|
/* NOTE: dev->current_state becomes nonzero only here, and
|
|
* only for devices that support PCI PM. Also, exiting
|
|
* PCI_D3 (but not PCI_D1 or PCI_D2) is allowed to reset
|
|
* some device state (e.g. as part of clock reinit).
|
|
*/
|
|
retval = pci_set_power_state (dev, PCI_D3hot);
|
|
if (retval == 0) {
|
|
dev_dbg (hcd->self.controller, "--> PCI D3\n");
|
|
pci_enable_wake (dev, PCI_D3hot, hcd->remote_wakeup);
|
|
pci_enable_wake (dev, PCI_D3cold, hcd->remote_wakeup);
|
|
} else if (retval < 0) {
|
|
dev_dbg (&dev->dev, "PCI D3 suspend fail, %d\n",
|
|
retval);
|
|
(void) usb_hcd_pci_resume (dev);
|
|
break;
|
|
}
|
|
break;
|
|
default:
|
|
dev_dbg (hcd->self.controller, "hcd state %d; not suspended\n",
|
|
hcd->state);
|
|
WARN_ON(1);
|
|
retval = -EINVAL;
|
|
break;
|
|
}
|
|
|
|
/* update power_state **ONLY** to make sysfs happier */
|
|
if (retval == 0)
|
|
dev->dev.power.power_state = message;
|
|
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);
|
|
if (hcd->state != HC_STATE_SUSPENDED) {
|
|
dev_dbg (hcd->self.controller,
|
|
"can't resume, not suspended!\n");
|
|
return 0;
|
|
}
|
|
|
|
/* NOTE: chip docs cover clean "real suspend" cases (what Linux
|
|
* calls "standby", "suspend to RAM", and so on). There are also
|
|
* dirty cases when swsusp fakes a suspend in "shutdown" mode.
|
|
*/
|
|
if (dev->current_state != PCI_D0) {
|
|
#ifdef DEBUG
|
|
int pci_pm;
|
|
u16 pmcr;
|
|
|
|
pci_pm = pci_find_capability(dev, PCI_CAP_ID_PM);
|
|
pci_read_config_word(dev, pci_pm + PCI_PM_CTRL, &pmcr);
|
|
pmcr &= PCI_PM_CTRL_STATE_MASK;
|
|
if (pmcr) {
|
|
/* Clean case: power to USB and to HC registers was
|
|
* maintained; remote wakeup is easy.
|
|
*/
|
|
dev_dbg(hcd->self.controller, "resume from PCI D%d\n",
|
|
pmcr);
|
|
} else {
|
|
/* Clean: HC lost Vcc power, D0 uninitialized
|
|
* + Vaux may have preserved port and transceiver
|
|
* state ... for remote wakeup from D3cold
|
|
* + or not; HCD must reinit + re-enumerate
|
|
*
|
|
* Dirty: D0 semi-initialized cases with swsusp
|
|
* + after BIOS init
|
|
* + after Linux init (HCD statically linked)
|
|
*/
|
|
dev_dbg(hcd->self.controller,
|
|
"PCI D0, from previous PCI D%d\n",
|
|
dev->current_state);
|
|
}
|
|
#endif
|
|
pci_enable_wake (dev, dev->current_state, 0);
|
|
pci_enable_wake (dev, PCI_D3cold, 0);
|
|
} else {
|
|
/* Same basic cases: clean (powered/not), dirty */
|
|
dev_dbg(hcd->self.controller, "PCI legacy resume\n");
|
|
}
|
|
|
|
/* NOTE: the PCI API itself is asymmetric here. We don't need to
|
|
* pci_set_power_state(PCI_D0) since that's part of re-enabling;
|
|
* but that won't re-enable bus mastering. Yet pci_disable_device()
|
|
* explicitly disables bus mastering...
|
|
*/
|
|
retval = pci_enable_device (dev);
|
|
if (retval < 0) {
|
|
dev_err (hcd->self.controller,
|
|
"can't re-enable after resume, %d!\n", retval);
|
|
return retval;
|
|
}
|
|
pci_set_master (dev);
|
|
pci_restore_state (dev);
|
|
|
|
dev->dev.power.power_state = PMSG_ON;
|
|
|
|
hcd->state = HC_STATE_RESUMING;
|
|
hcd->saw_irq = 0;
|
|
retval = request_irq (dev->irq, usb_hcd_irq, SA_SHIRQ,
|
|
hcd->irq_descr, hcd);
|
|
if (retval < 0) {
|
|
dev_err (hcd->self.controller,
|
|
"can't restore IRQ after resume!\n");
|
|
usb_hc_died (hcd);
|
|
return retval;
|
|
}
|
|
|
|
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 */
|
|
|
|
|