359 lines
9 KiB
C
359 lines
9 KiB
C
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/*
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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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#ifdef CONFIG_USB_DEBUG
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#define DEBUG
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#else
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#undef DEBUG
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#endif
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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 <asm/io.h>
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#include <asm/irq.h>
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#include <linux/usb.h>
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#include "hcd.h"
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/* PCI-based HCs are normal, but custom bus glue should be ok */
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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 = 0;
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dev->dev.power.power_state = 0;
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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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#ifdef CONFIG_PCI_NAMES
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hcd->product_desc = dev->pretty_name;
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#endif
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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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static char __attribute_used__ *pci_state(u32 state)
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{
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switch (state) {
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case 0: return "D0";
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case 1: return "D1";
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case 2: return "D2";
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case 3: return "D3hot";
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case 4: return "D3cold";
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}
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return NULL;
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}
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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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* @state: state that the controller is going into
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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, u32 state)
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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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/* 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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if (state > 4)
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state = 4;
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switch (hcd->state) {
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/* entry if root hub wasn't yet suspended ... from sysfs,
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* without autosuspend, or if USB_SUSPEND isn't configured.
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*/
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case HC_STATE_RUNNING:
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hcd->state = HC_STATE_QUIESCING;
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retval = hcd->driver->suspend (hcd, state);
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if (retval) {
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dev_dbg (hcd->self.controller,
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"suspend fail, retval %d\n",
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retval);
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break;
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}
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hcd->state = HC_STATE_SUSPENDED;
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/* FALLTHROUGH */
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/* entry with CONFIG_USB_SUSPEND, or hcds that autosuspend: the
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* controller and/or root hub will already have been suspended,
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* but it won't be ready for a PCI resume call.
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*
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* FIXME only CONFIG_USB_SUSPEND guarantees hub_suspend() will
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* have been called, otherwise root hub timers still run ...
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*/
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case HC_STATE_SUSPENDED:
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if (state <= dev->current_state)
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break;
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/* no DMA or IRQs except in D0 */
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if (!dev->current_state) {
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pci_save_state (dev);
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pci_disable_device (dev);
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free_irq (hcd->irq, hcd);
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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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break;
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}
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/* POLICY: ignore D1/D2/D3hot differences;
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* we know D3hot will always work.
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*/
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retval = pci_set_power_state (dev, state);
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if (retval < 0 && state < 3) {
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retval = pci_set_power_state (dev, 3);
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if (retval == 0)
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state = 3;
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}
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if (retval == 0) {
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dev_dbg (hcd->self.controller, "--> PCI %s\n",
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pci_state(dev->current_state));
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#ifdef CONFIG_USB_SUSPEND
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pci_enable_wake (dev, state, hcd->remote_wakeup);
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pci_enable_wake (dev, 4, hcd->remote_wakeup);
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#endif
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} else if (retval < 0) {
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dev_dbg (&dev->dev, "PCI %s suspend fail, %d\n",
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pci_state(state), retval);
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(void) usb_hcd_pci_resume (dev);
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break;
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}
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break;
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default:
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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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retval = -EINVAL;
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break;
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}
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/* update power_state **ONLY** to make sysfs happier */
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if (retval == 0)
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dev->dev.power.power_state = state;
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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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int has_pci_pm;
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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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has_pci_pm = pci_find_capability(dev, PCI_CAP_ID_PM);
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/* D3cold resume isn't usually reported this way... */
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dev_dbg(hcd->self.controller, "resume from PCI %s%s\n",
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pci_state(dev->current_state),
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has_pci_pm ? "" : " (legacy)");
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hcd->state = HC_STATE_RESUMING;
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if (has_pci_pm)
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pci_set_power_state (dev, 0);
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dev->dev.power.power_state = 0;
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retval = request_irq (dev->irq, usb_hcd_irq, SA_SHIRQ,
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hcd->driver->description, hcd);
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if (retval < 0) {
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dev_err (hcd->self.controller,
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"can't restore IRQ after resume!\n");
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return retval;
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}
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hcd->saw_irq = 0;
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pci_restore_state (dev);
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#ifdef CONFIG_USB_SUSPEND
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pci_enable_wake (dev, dev->current_state, 0);
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pci_enable_wake (dev, 4, 0);
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#endif
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retval = hcd->driver->resume (hcd);
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if (!HC_IS_RUNNING (hcd->state)) {
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dev_dbg (hcd->self.controller,
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"resume fail, retval %d\n", retval);
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usb_hc_died (hcd);
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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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