414 lines
11 KiB
C
414 lines
11 KiB
C
/*
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* (C) Copyright David Brownell 2000-2002
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the
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* Free Software Foundation; either version 2 of the License, or (at your
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* option) any later version.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
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* or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software Foundation,
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* Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*/
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#include <linux/config.h>
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/pci.h>
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#include <linux/usb.h>
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#include <asm/io.h>
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#include <asm/irq.h>
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#ifdef CONFIG_PPC_PMAC
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#include <asm/machdep.h>
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#include <asm/pmac_feature.h>
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#include <asm/pci-bridge.h>
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#include <asm/prom.h>
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#endif
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#include "usb.h"
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#include "hcd.h"
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/* PCI-based HCs are common, but plenty of non-PCI HCs are used too */
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/*-------------------------------------------------------------------------*/
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/* configure so an HC device and id are always provided */
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/* always called with process context; sleeping is OK */
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/**
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* usb_hcd_pci_probe - initialize PCI-based HCDs
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* @dev: USB Host Controller being probed
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* @id: pci hotplug id connecting controller to HCD framework
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* Context: !in_interrupt()
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*
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* Allocates basic PCI resources for this USB host controller, and
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* then invokes the start() method for the HCD associated with it
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* through the hotplug entry's driver_data.
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*
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* Store this function in the HCD's struct pci_driver as probe().
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*/
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int usb_hcd_pci_probe (struct pci_dev *dev, const struct pci_device_id *id)
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{
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struct hc_driver *driver;
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struct usb_hcd *hcd;
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int retval;
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if (usb_disabled())
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return -ENODEV;
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if (!id || !(driver = (struct hc_driver *) id->driver_data))
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return -EINVAL;
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if (pci_enable_device (dev) < 0)
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return -ENODEV;
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dev->current_state = PCI_D0;
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dev->dev.power.power_state = PMSG_ON;
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if (!dev->irq) {
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dev_err (&dev->dev,
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"Found HC with no IRQ. Check BIOS/PCI %s setup!\n",
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pci_name(dev));
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retval = -ENODEV;
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goto err1;
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}
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hcd = usb_create_hcd (driver, &dev->dev, pci_name(dev));
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if (!hcd) {
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retval = -ENOMEM;
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goto err1;
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}
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if (driver->flags & HCD_MEMORY) { // EHCI, OHCI
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hcd->rsrc_start = pci_resource_start (dev, 0);
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hcd->rsrc_len = pci_resource_len (dev, 0);
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if (!request_mem_region (hcd->rsrc_start, hcd->rsrc_len,
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driver->description)) {
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dev_dbg (&dev->dev, "controller already in use\n");
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retval = -EBUSY;
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goto err2;
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}
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hcd->regs = ioremap_nocache (hcd->rsrc_start, hcd->rsrc_len);
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if (hcd->regs == NULL) {
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dev_dbg (&dev->dev, "error mapping memory\n");
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retval = -EFAULT;
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goto err3;
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}
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} else { // UHCI
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int region;
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for (region = 0; region < PCI_ROM_RESOURCE; region++) {
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if (!(pci_resource_flags (dev, region) &
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IORESOURCE_IO))
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continue;
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hcd->rsrc_start = pci_resource_start (dev, region);
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hcd->rsrc_len = pci_resource_len (dev, region);
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if (request_region (hcd->rsrc_start, hcd->rsrc_len,
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driver->description))
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break;
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}
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if (region == PCI_ROM_RESOURCE) {
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dev_dbg (&dev->dev, "no i/o regions available\n");
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retval = -EBUSY;
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goto err1;
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}
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}
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pci_set_master (dev);
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retval = usb_add_hcd (hcd, dev->irq, SA_SHIRQ);
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if (retval != 0)
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goto err4;
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return retval;
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err4:
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if (driver->flags & HCD_MEMORY) {
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iounmap (hcd->regs);
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err3:
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release_mem_region (hcd->rsrc_start, hcd->rsrc_len);
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} else
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release_region (hcd->rsrc_start, hcd->rsrc_len);
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err2:
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usb_put_hcd (hcd);
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err1:
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pci_disable_device (dev);
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dev_err (&dev->dev, "init %s fail, %d\n", pci_name(dev), retval);
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return retval;
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}
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EXPORT_SYMBOL (usb_hcd_pci_probe);
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/* may be called without controller electrically present */
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/* may be called with controller, bus, and devices active */
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/**
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* usb_hcd_pci_remove - shutdown processing for PCI-based HCDs
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* @dev: USB Host Controller being removed
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* Context: !in_interrupt()
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*
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* Reverses the effect of usb_hcd_pci_probe(), first invoking
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* the HCD's stop() method. It is always called from a thread
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* context, normally "rmmod", "apmd", or something similar.
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*
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* Store this function in the HCD's struct pci_driver as remove().
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*/
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void usb_hcd_pci_remove (struct pci_dev *dev)
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{
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struct usb_hcd *hcd;
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hcd = pci_get_drvdata(dev);
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if (!hcd)
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return;
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usb_remove_hcd (hcd);
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if (hcd->driver->flags & HCD_MEMORY) {
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iounmap (hcd->regs);
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release_mem_region (hcd->rsrc_start, hcd->rsrc_len);
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} else {
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release_region (hcd->rsrc_start, hcd->rsrc_len);
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}
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usb_put_hcd (hcd);
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pci_disable_device(dev);
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}
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EXPORT_SYMBOL (usb_hcd_pci_remove);
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#ifdef CONFIG_PM
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/**
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* usb_hcd_pci_suspend - power management suspend of a PCI-based HCD
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* @dev: USB Host Controller being suspended
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* @message: semantics in flux
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*
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* Store this function in the HCD's struct pci_driver as suspend().
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*/
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int usb_hcd_pci_suspend (struct pci_dev *dev, pm_message_t message)
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{
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struct usb_hcd *hcd;
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int retval = 0;
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int has_pci_pm;
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hcd = pci_get_drvdata(dev);
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/* Root hub suspend should have stopped all downstream traffic,
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* and all bus master traffic. And done so for both the interface
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* and the stub usb_device (which we check here). But maybe it
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* didn't; writing sysfs power/state files ignores such rules...
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*
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* We must ignore the FREEZE vs SUSPEND distinction here, because
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* otherwise the swsusp will save (and restore) garbage state.
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*/
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if (hcd->self.root_hub->dev.power.power_state.event == PM_EVENT_ON)
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return -EBUSY;
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if (hcd->driver->suspend) {
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retval = hcd->driver->suspend(hcd, message);
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if (retval) {
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dev_dbg (&dev->dev, "PCI pre-suspend fail, %d\n",
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retval);
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goto done;
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}
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}
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synchronize_irq(dev->irq);
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/* FIXME until the generic PM interfaces change a lot more, this
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* can't use PCI D1 and D2 states. For example, the confusion
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* between messages and states will need to vanish, and messages
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* will need to provide a target system state again.
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*
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* It'll be important to learn characteristics of the target state,
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* especially on embedded hardware where the HCD will often be in
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* charge of an external VBUS power supply and one or more clocks.
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* Some target system states will leave them active; others won't.
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* (With PCI, that's often handled by platform BIOS code.)
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*/
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/* even when the PCI layer rejects some of the PCI calls
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* below, HCs can try global suspend and reduce DMA traffic.
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* PM-sensitive HCDs may already have done this.
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*/
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has_pci_pm = pci_find_capability(dev, PCI_CAP_ID_PM);
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/* Downstream ports from this root hub should already be quiesced, so
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* there will be no DMA activity. Now we can shut down the upstream
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* link (except maybe for PME# resume signaling) and enter some PCI
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* low power state, if the hardware allows.
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*/
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if (hcd->state == HC_STATE_SUSPENDED) {
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/* no DMA or IRQs except when HC is active */
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if (dev->current_state == PCI_D0) {
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pci_save_state (dev);
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pci_disable_device (dev);
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}
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if (!has_pci_pm) {
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dev_dbg (hcd->self.controller, "--> PCI D0/legacy\n");
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goto done;
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}
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/* NOTE: dev->current_state becomes nonzero only here, and
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* only for devices that support PCI PM. Also, exiting
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* PCI_D3 (but not PCI_D1 or PCI_D2) is allowed to reset
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* some device state (e.g. as part of clock reinit).
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*/
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retval = pci_set_power_state (dev, PCI_D3hot);
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if (retval == 0) {
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dev_dbg (hcd->self.controller, "--> PCI D3\n");
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/* Ignore these return values. We rely on pci code to
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* reject requests the hardware can't implement, rather
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* than coding the same thing.
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*/
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(void) pci_enable_wake (dev, PCI_D3hot, hcd->remote_wakeup);
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(void) pci_enable_wake (dev, PCI_D3cold, hcd->remote_wakeup);
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} else {
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dev_dbg (&dev->dev, "PCI D3 suspend fail, %d\n",
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retval);
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(void) usb_hcd_pci_resume (dev);
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}
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} else {
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dev_dbg (hcd->self.controller, "hcd state %d; not suspended\n",
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hcd->state);
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WARN_ON(1);
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retval = -EINVAL;
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}
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done:
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if (retval == 0) {
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dev->dev.power.power_state = PMSG_SUSPEND;
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#ifdef CONFIG_PPC_PMAC
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/* Disable ASIC clocks for USB */
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if (_machine == _MACH_Pmac) {
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struct device_node *of_node;
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of_node = pci_device_to_OF_node (dev);
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if (of_node)
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pmac_call_feature(PMAC_FTR_USB_ENABLE,
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of_node, 0, 0);
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}
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#endif
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}
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return retval;
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}
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EXPORT_SYMBOL (usb_hcd_pci_suspend);
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/**
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* usb_hcd_pci_resume - power management resume of a PCI-based HCD
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* @dev: USB Host Controller being resumed
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*
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* Store this function in the HCD's struct pci_driver as resume().
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*/
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int usb_hcd_pci_resume (struct pci_dev *dev)
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{
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struct usb_hcd *hcd;
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int retval;
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hcd = pci_get_drvdata(dev);
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if (hcd->state != HC_STATE_SUSPENDED) {
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dev_dbg (hcd->self.controller,
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"can't resume, not suspended!\n");
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return 0;
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}
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#ifdef CONFIG_PPC_PMAC
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/* Reenable ASIC clocks for USB */
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if (_machine == _MACH_Pmac) {
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struct device_node *of_node;
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of_node = pci_device_to_OF_node (dev);
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if (of_node)
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pmac_call_feature (PMAC_FTR_USB_ENABLE,
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of_node, 0, 1);
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}
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#endif
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/* NOTE: chip docs cover clean "real suspend" cases (what Linux
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* calls "standby", "suspend to RAM", and so on). There are also
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* dirty cases when swsusp fakes a suspend in "shutdown" mode.
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*/
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if (dev->current_state != PCI_D0) {
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#ifdef DEBUG
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int pci_pm;
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u16 pmcr;
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pci_pm = pci_find_capability(dev, PCI_CAP_ID_PM);
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pci_read_config_word(dev, pci_pm + PCI_PM_CTRL, &pmcr);
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pmcr &= PCI_PM_CTRL_STATE_MASK;
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if (pmcr) {
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/* Clean case: power to USB and to HC registers was
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* maintained; remote wakeup is easy.
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*/
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dev_dbg(hcd->self.controller, "resume from PCI D%d\n",
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pmcr);
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} else {
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/* Clean: HC lost Vcc power, D0 uninitialized
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* + Vaux may have preserved port and transceiver
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* state ... for remote wakeup from D3cold
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* + or not; HCD must reinit + re-enumerate
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*
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* Dirty: D0 semi-initialized cases with swsusp
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* + after BIOS init
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* + after Linux init (HCD statically linked)
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*/
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dev_dbg(hcd->self.controller,
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"PCI D0, from previous PCI D%d\n",
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dev->current_state);
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}
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#endif
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/* yes, ignore these results too... */
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(void) pci_enable_wake (dev, dev->current_state, 0);
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(void) pci_enable_wake (dev, PCI_D3cold, 0);
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} else {
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/* Same basic cases: clean (powered/not), dirty */
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dev_dbg(hcd->self.controller, "PCI legacy resume\n");
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}
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/* NOTE: the PCI API itself is asymmetric here. We don't need to
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* pci_set_power_state(PCI_D0) since that's part of re-enabling;
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* but that won't re-enable bus mastering. Yet pci_disable_device()
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* explicitly disables bus mastering...
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*/
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retval = pci_enable_device (dev);
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if (retval < 0) {
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dev_err (hcd->self.controller,
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"can't re-enable after resume, %d!\n", retval);
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return retval;
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}
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pci_set_master (dev);
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pci_restore_state (dev);
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dev->dev.power.power_state = PMSG_ON;
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clear_bit(HCD_FLAG_SAW_IRQ, &hcd->flags);
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if (hcd->driver->resume) {
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retval = hcd->driver->resume(hcd);
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if (retval) {
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dev_err (hcd->self.controller,
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"PCI post-resume error %d!\n", retval);
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usb_hc_died (hcd);
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}
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}
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return retval;
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}
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EXPORT_SYMBOL (usb_hcd_pci_resume);
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#endif /* CONFIG_PM */
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