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632 lines
17 KiB
632 lines
17 KiB
// SPDX-License-Identifier: GPL-2.0+ |
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/* |
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* (C) Copyright David Brownell 2000-2002 |
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*/ |
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|
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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 <linux/usb/hcd.h> |
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|
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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/prom.h> |
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#endif |
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#include "usb.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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* Coordinate handoffs between EHCI and companion controllers |
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* during EHCI probing and system resume. |
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*/ |
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static DECLARE_RWSEM(companions_rwsem); |
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#define CL_UHCI PCI_CLASS_SERIAL_USB_UHCI |
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#define CL_OHCI PCI_CLASS_SERIAL_USB_OHCI |
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#define CL_EHCI PCI_CLASS_SERIAL_USB_EHCI |
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static inline int is_ohci_or_uhci(struct pci_dev *pdev) |
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{ |
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return pdev->class == CL_OHCI || pdev->class == CL_UHCI; |
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} |
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typedef void (*companion_fn)(struct pci_dev *pdev, struct usb_hcd *hcd, |
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struct pci_dev *companion, struct usb_hcd *companion_hcd); |
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/* Iterate over PCI devices in the same slot as pdev and call fn for each */ |
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static void for_each_companion(struct pci_dev *pdev, struct usb_hcd *hcd, |
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companion_fn fn) |
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{ |
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struct pci_dev *companion; |
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struct usb_hcd *companion_hcd; |
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unsigned int slot = PCI_SLOT(pdev->devfn); |
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/* |
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* Iterate through other PCI functions in the same slot. |
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* If the function's drvdata isn't set then it isn't bound to |
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* a USB host controller driver, so skip it. |
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*/ |
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companion = NULL; |
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for_each_pci_dev(companion) { |
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if (companion->bus != pdev->bus || |
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PCI_SLOT(companion->devfn) != slot) |
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continue; |
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/* |
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* Companion device should be either UHCI,OHCI or EHCI host |
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* controller, otherwise skip. |
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*/ |
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if (companion->class != CL_UHCI && companion->class != CL_OHCI && |
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companion->class != CL_EHCI) |
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continue; |
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companion_hcd = pci_get_drvdata(companion); |
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if (!companion_hcd || !companion_hcd->self.root_hub) |
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continue; |
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fn(pdev, hcd, companion, companion_hcd); |
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} |
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} |
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/* |
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* We're about to add an EHCI controller, which will unceremoniously grab |
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* all the port connections away from its companions. To prevent annoying |
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* error messages, lock the companion's root hub and gracefully unconfigure |
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* it beforehand. Leave it locked until the EHCI controller is all set. |
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*/ |
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static void ehci_pre_add(struct pci_dev *pdev, struct usb_hcd *hcd, |
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struct pci_dev *companion, struct usb_hcd *companion_hcd) |
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{ |
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struct usb_device *udev; |
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if (is_ohci_or_uhci(companion)) { |
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udev = companion_hcd->self.root_hub; |
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usb_lock_device(udev); |
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usb_set_configuration(udev, 0); |
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} |
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} |
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/* |
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* Adding the EHCI controller has either succeeded or failed. Set the |
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* companion pointer accordingly, and in either case, reconfigure and |
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* unlock the root hub. |
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*/ |
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static void ehci_post_add(struct pci_dev *pdev, struct usb_hcd *hcd, |
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struct pci_dev *companion, struct usb_hcd *companion_hcd) |
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{ |
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struct usb_device *udev; |
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if (is_ohci_or_uhci(companion)) { |
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if (dev_get_drvdata(&pdev->dev)) { /* Succeeded */ |
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dev_dbg(&pdev->dev, "HS companion for %s\n", |
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dev_name(&companion->dev)); |
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companion_hcd->self.hs_companion = &hcd->self; |
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} |
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udev = companion_hcd->self.root_hub; |
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usb_set_configuration(udev, 1); |
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usb_unlock_device(udev); |
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} |
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} |
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/* |
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* We just added a non-EHCI controller. Find the EHCI controller to |
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* which it is a companion, and store a pointer to the bus structure. |
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*/ |
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static void non_ehci_add(struct pci_dev *pdev, struct usb_hcd *hcd, |
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struct pci_dev *companion, struct usb_hcd *companion_hcd) |
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{ |
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if (is_ohci_or_uhci(pdev) && companion->class == CL_EHCI) { |
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dev_dbg(&pdev->dev, "FS/LS companion for %s\n", |
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dev_name(&companion->dev)); |
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hcd->self.hs_companion = &companion_hcd->self; |
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} |
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} |
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/* We are removing an EHCI controller. Clear the companions' pointers. */ |
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static void ehci_remove(struct pci_dev *pdev, struct usb_hcd *hcd, |
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struct pci_dev *companion, struct usb_hcd *companion_hcd) |
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{ |
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if (is_ohci_or_uhci(companion)) |
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companion_hcd->self.hs_companion = NULL; |
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} |
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#ifdef CONFIG_PM |
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/* An EHCI controller must wait for its companions before resuming. */ |
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static void ehci_wait_for_companions(struct pci_dev *pdev, struct usb_hcd *hcd, |
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struct pci_dev *companion, struct usb_hcd *companion_hcd) |
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{ |
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if (is_ohci_or_uhci(companion)) |
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device_pm_wait_for_dev(&pdev->dev, &companion->dev); |
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} |
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#endif /* CONFIG_PM */ |
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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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* @driver: USB HC driver handle |
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* |
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* Context: task context, might sleep |
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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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* Return: 0 if successful. |
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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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const struct hc_driver *driver) |
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{ |
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struct usb_hcd *hcd; |
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int retval; |
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int hcd_irq = 0; |
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if (usb_disabled()) |
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return -ENODEV; |
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if (!id) |
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return -EINVAL; |
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if (!driver) |
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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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/* |
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* The xHCI driver has its own irq management |
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* make sure irq setup is not touched for xhci in generic hcd code |
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*/ |
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if ((driver->flags & HCD_MASK) < HCD_USB3) { |
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retval = pci_alloc_irq_vectors(dev, 1, 1, PCI_IRQ_LEGACY | PCI_IRQ_MSI); |
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if (retval < 0) { |
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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 disable_pci; |
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} |
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hcd_irq = pci_irq_vector(dev, 0); |
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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 free_irq_vectors; |
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} |
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hcd->amd_resume_bug = (usb_hcd_amd_remote_wakeup_quirk(dev) && |
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driver->flags & (HCD_USB11 | HCD_USB3)) ? 1 : 0; |
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if (driver->flags & HCD_MEMORY) { |
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/* 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 (!devm_request_mem_region(&dev->dev, hcd->rsrc_start, |
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hcd->rsrc_len, 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 put_hcd; |
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} |
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hcd->regs = devm_ioremap(&dev->dev, hcd->rsrc_start, |
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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 put_hcd; |
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} |
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} else { |
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/* UHCI */ |
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int region; |
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for (region = 0; region < PCI_STD_NUM_BARS; 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 (devm_request_region(&dev->dev, hcd->rsrc_start, |
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hcd->rsrc_len, 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 put_hcd; |
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} |
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} |
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pci_set_master(dev); |
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/* Note: dev_set_drvdata must be called while holding the rwsem */ |
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if (dev->class == CL_EHCI) { |
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down_write(&companions_rwsem); |
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dev_set_drvdata(&dev->dev, hcd); |
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for_each_companion(dev, hcd, ehci_pre_add); |
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retval = usb_add_hcd(hcd, hcd_irq, IRQF_SHARED); |
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if (retval != 0) |
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dev_set_drvdata(&dev->dev, NULL); |
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for_each_companion(dev, hcd, ehci_post_add); |
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up_write(&companions_rwsem); |
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} else { |
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down_read(&companions_rwsem); |
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dev_set_drvdata(&dev->dev, hcd); |
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retval = usb_add_hcd(hcd, hcd_irq, IRQF_SHARED); |
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if (retval != 0) |
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dev_set_drvdata(&dev->dev, NULL); |
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else |
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for_each_companion(dev, hcd, non_ehci_add); |
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up_read(&companions_rwsem); |
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} |
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if (retval != 0) |
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goto put_hcd; |
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device_wakeup_enable(hcd->self.controller); |
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if (pci_dev_run_wake(dev)) |
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pm_runtime_put_noidle(&dev->dev); |
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return retval; |
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put_hcd: |
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usb_put_hcd(hcd); |
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free_irq_vectors: |
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if ((driver->flags & HCD_MASK) < HCD_USB3) |
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pci_free_irq_vectors(dev); |
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disable_pci: |
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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_GPL(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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* |
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* Context: task context, might sleep |
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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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int hcd_driver_flags; |
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hcd = pci_get_drvdata(dev); |
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if (!hcd) |
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return; |
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hcd_driver_flags = hcd->driver->flags; |
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if (pci_dev_run_wake(dev)) |
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pm_runtime_get_noresume(&dev->dev); |
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/* Fake an interrupt request in order to give the driver a chance |
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* to test whether the controller hardware has been removed (e.g., |
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* cardbus physical eject). |
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*/ |
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local_irq_disable(); |
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usb_hcd_irq(0, hcd); |
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local_irq_enable(); |
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/* Note: dev_set_drvdata must be called while holding the rwsem */ |
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if (dev->class == CL_EHCI) { |
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down_write(&companions_rwsem); |
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for_each_companion(dev, hcd, ehci_remove); |
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usb_remove_hcd(hcd); |
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dev_set_drvdata(&dev->dev, NULL); |
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up_write(&companions_rwsem); |
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} else { |
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/* Not EHCI; just clear the companion pointer */ |
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down_read(&companions_rwsem); |
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hcd->self.hs_companion = NULL; |
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usb_remove_hcd(hcd); |
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dev_set_drvdata(&dev->dev, NULL); |
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up_read(&companions_rwsem); |
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} |
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usb_put_hcd(hcd); |
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if ((hcd_driver_flags & HCD_MASK) < HCD_USB3) |
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pci_free_irq_vectors(dev); |
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pci_disable_device(dev); |
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} |
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EXPORT_SYMBOL_GPL(usb_hcd_pci_remove); |
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/** |
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* usb_hcd_pci_shutdown - shutdown host controller |
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* @dev: USB Host Controller being shutdown |
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*/ |
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void usb_hcd_pci_shutdown(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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if (test_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags) && |
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hcd->driver->shutdown) { |
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hcd->driver->shutdown(hcd); |
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if (usb_hcd_is_primary_hcd(hcd) && hcd->irq > 0) |
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free_irq(hcd->irq, hcd); |
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pci_disable_device(dev); |
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} |
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} |
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EXPORT_SYMBOL_GPL(usb_hcd_pci_shutdown); |
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#ifdef CONFIG_PM |
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#ifdef CONFIG_PPC_PMAC |
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static void powermac_set_asic(struct pci_dev *pci_dev, int enable) |
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{ |
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/* Enanble or disable ASIC clocks for USB */ |
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if (machine_is(powermac)) { |
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struct device_node *of_node; |
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of_node = pci_device_to_OF_node(pci_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, enable); |
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} |
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} |
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#else |
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static inline void powermac_set_asic(struct pci_dev *pci_dev, int enable) |
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{} |
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#endif /* CONFIG_PPC_PMAC */ |
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static int check_root_hub_suspended(struct device *dev) |
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{ |
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struct usb_hcd *hcd = dev_get_drvdata(dev); |
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if (HCD_RH_RUNNING(hcd)) { |
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dev_warn(dev, "Root hub is not suspended\n"); |
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return -EBUSY; |
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} |
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if (hcd->shared_hcd) { |
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hcd = hcd->shared_hcd; |
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if (HCD_RH_RUNNING(hcd)) { |
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dev_warn(dev, "Secondary root hub is not suspended\n"); |
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return -EBUSY; |
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} |
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} |
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return 0; |
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} |
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static int suspend_common(struct device *dev, bool do_wakeup) |
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{ |
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struct pci_dev *pci_dev = to_pci_dev(dev); |
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struct usb_hcd *hcd = pci_get_drvdata(pci_dev); |
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int retval; |
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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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retval = check_root_hub_suspended(dev); |
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if (retval) |
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return retval; |
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if (hcd->driver->pci_suspend && !HCD_DEAD(hcd)) { |
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/* Optimization: Don't suspend if a root-hub wakeup is |
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* pending and it would cause the HCD to wake up anyway. |
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*/ |
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if (do_wakeup && HCD_WAKEUP_PENDING(hcd)) |
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return -EBUSY; |
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if (do_wakeup && hcd->shared_hcd && |
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HCD_WAKEUP_PENDING(hcd->shared_hcd)) |
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return -EBUSY; |
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retval = hcd->driver->pci_suspend(hcd, do_wakeup); |
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suspend_report_result(hcd->driver->pci_suspend, retval); |
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/* Check again in case wakeup raced with pci_suspend */ |
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if ((retval == 0 && do_wakeup && HCD_WAKEUP_PENDING(hcd)) || |
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(retval == 0 && do_wakeup && hcd->shared_hcd && |
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HCD_WAKEUP_PENDING(hcd->shared_hcd))) { |
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if (hcd->driver->pci_resume) |
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hcd->driver->pci_resume(hcd, false); |
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retval = -EBUSY; |
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} |
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if (retval) |
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return retval; |
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} |
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/* If MSI-X is enabled, the driver will have synchronized all vectors |
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* in pci_suspend(). If MSI or legacy PCI is enabled, that will be |
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* synchronized here. |
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*/ |
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if (!hcd->msix_enabled) |
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synchronize_irq(pci_irq_vector(pci_dev, 0)); |
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|
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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). We'll enter a |
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* low power state during suspend_noirq, if the hardware allows. |
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*/ |
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pci_disable_device(pci_dev); |
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return retval; |
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} |
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static int resume_common(struct device *dev, int event) |
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{ |
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struct pci_dev *pci_dev = to_pci_dev(dev); |
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struct usb_hcd *hcd = pci_get_drvdata(pci_dev); |
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int retval; |
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|
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if (HCD_RH_RUNNING(hcd) || |
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(hcd->shared_hcd && |
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HCD_RH_RUNNING(hcd->shared_hcd))) { |
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dev_dbg(dev, "can't resume, not suspended!\n"); |
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return 0; |
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} |
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|
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retval = pci_enable_device(pci_dev); |
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if (retval < 0) { |
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dev_err(dev, "can't re-enable after resume, %d!\n", retval); |
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return retval; |
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} |
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|
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pci_set_master(pci_dev); |
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|
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if (hcd->driver->pci_resume && !HCD_DEAD(hcd)) { |
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|
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/* |
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* Only EHCI controllers have to wait for their companions. |
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* No locking is needed because PCI controller drivers do not |
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* get unbound during system resume. |
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*/ |
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if (pci_dev->class == CL_EHCI && event != PM_EVENT_AUTO_RESUME) |
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for_each_companion(pci_dev, hcd, |
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ehci_wait_for_companions); |
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|
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retval = hcd->driver->pci_resume(hcd, |
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event == PM_EVENT_RESTORE); |
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if (retval) { |
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dev_err(dev, "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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|
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#ifdef CONFIG_PM_SLEEP |
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|
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static int hcd_pci_suspend(struct device *dev) |
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{ |
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return suspend_common(dev, device_may_wakeup(dev)); |
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} |
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|
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static int hcd_pci_suspend_noirq(struct device *dev) |
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{ |
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struct pci_dev *pci_dev = to_pci_dev(dev); |
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struct usb_hcd *hcd = pci_get_drvdata(pci_dev); |
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int retval; |
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|
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retval = check_root_hub_suspended(dev); |
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if (retval) |
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return retval; |
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|
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pci_save_state(pci_dev); |
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|
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/* If the root hub is dead rather than suspended, disallow remote |
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* wakeup. usb_hc_died() should ensure that both hosts are marked as |
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* dying, so we only need to check the primary roothub. |
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*/ |
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if (HCD_DEAD(hcd)) |
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device_set_wakeup_enable(dev, 0); |
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dev_dbg(dev, "wakeup: %d\n", device_may_wakeup(dev)); |
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|
|
/* Possibly enable remote wakeup, |
|
* choose the appropriate low-power state, and go to that state. |
|
*/ |
|
retval = pci_prepare_to_sleep(pci_dev); |
|
if (retval == -EIO) { /* Low-power not supported */ |
|
dev_dbg(dev, "--> PCI D0 legacy\n"); |
|
retval = 0; |
|
} else if (retval == 0) { |
|
dev_dbg(dev, "--> PCI %s\n", |
|
pci_power_name(pci_dev->current_state)); |
|
} else { |
|
suspend_report_result(pci_prepare_to_sleep, retval); |
|
return retval; |
|
} |
|
|
|
powermac_set_asic(pci_dev, 0); |
|
return retval; |
|
} |
|
|
|
static int hcd_pci_resume_noirq(struct device *dev) |
|
{ |
|
powermac_set_asic(to_pci_dev(dev), 1); |
|
return 0; |
|
} |
|
|
|
static int hcd_pci_resume(struct device *dev) |
|
{ |
|
return resume_common(dev, PM_EVENT_RESUME); |
|
} |
|
|
|
static int hcd_pci_restore(struct device *dev) |
|
{ |
|
return resume_common(dev, PM_EVENT_RESTORE); |
|
} |
|
|
|
#else |
|
|
|
#define hcd_pci_suspend NULL |
|
#define hcd_pci_suspend_noirq NULL |
|
#define hcd_pci_resume_noirq NULL |
|
#define hcd_pci_resume NULL |
|
#define hcd_pci_restore NULL |
|
|
|
#endif /* CONFIG_PM_SLEEP */ |
|
|
|
static int hcd_pci_runtime_suspend(struct device *dev) |
|
{ |
|
int retval; |
|
|
|
retval = suspend_common(dev, true); |
|
if (retval == 0) |
|
powermac_set_asic(to_pci_dev(dev), 0); |
|
dev_dbg(dev, "hcd_pci_runtime_suspend: %d\n", retval); |
|
return retval; |
|
} |
|
|
|
static int hcd_pci_runtime_resume(struct device *dev) |
|
{ |
|
int retval; |
|
|
|
powermac_set_asic(to_pci_dev(dev), 1); |
|
retval = resume_common(dev, PM_EVENT_AUTO_RESUME); |
|
dev_dbg(dev, "hcd_pci_runtime_resume: %d\n", retval); |
|
return retval; |
|
} |
|
|
|
const struct dev_pm_ops usb_hcd_pci_pm_ops = { |
|
.suspend = hcd_pci_suspend, |
|
.suspend_noirq = hcd_pci_suspend_noirq, |
|
.resume_noirq = hcd_pci_resume_noirq, |
|
.resume = hcd_pci_resume, |
|
.freeze = check_root_hub_suspended, |
|
.freeze_noirq = check_root_hub_suspended, |
|
.thaw_noirq = NULL, |
|
.thaw = NULL, |
|
.poweroff = hcd_pci_suspend, |
|
.poweroff_noirq = hcd_pci_suspend_noirq, |
|
.restore_noirq = hcd_pci_resume_noirq, |
|
.restore = hcd_pci_restore, |
|
.runtime_suspend = hcd_pci_runtime_suspend, |
|
.runtime_resume = hcd_pci_runtime_resume, |
|
}; |
|
EXPORT_SYMBOL_GPL(usb_hcd_pci_pm_ops); |
|
|
|
#endif /* CONFIG_PM */
|
|
|