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author | Linus Torvalds <torvalds@ppc970.osdl.org> | 2005-04-16 15:20:36 -0700 |
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committer | Linus Torvalds <torvalds@ppc970.osdl.org> | 2005-04-16 15:20:36 -0700 |
commit | 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 (patch) | |
tree | 0bba044c4ce775e45a88a51686b5d9f90697ea9d /drivers/usb/core/hcd-pci.c | |
download | linux-stable-1da177e4c3f41524e886b7f1b8a0c1fc7321cac2.tar.gz linux-stable-1da177e4c3f41524e886b7f1b8a0c1fc7321cac2.tar.bz2 linux-stable-1da177e4c3f41524e886b7f1b8a0c1fc7321cac2.zip |
Linux-2.6.12-rc2v2.6.12-rc2
Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.
Let it rip!
Diffstat (limited to 'drivers/usb/core/hcd-pci.c')
-rw-r--r-- | drivers/usb/core/hcd-pci.c | 358 |
1 files changed, 358 insertions, 0 deletions
diff --git a/drivers/usb/core/hcd-pci.c b/drivers/usb/core/hcd-pci.c new file mode 100644 index 000000000000..b9a3dae07036 --- /dev/null +++ b/drivers/usb/core/hcd-pci.c @@ -0,0 +1,358 @@ +/* + * (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 */ + + |