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315 lines
8.6 KiB
315 lines
8.6 KiB
// SPDX-License-Identifier: GPL-2.0 |
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/* |
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* UHCI HCD (Host Controller Driver) PCI Bus Glue. |
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* |
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* Extracted from uhci-hcd.c: |
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* Maintainer: Alan Stern <[email protected]> |
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* |
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* (C) Copyright 1999 Linus Torvalds |
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* (C) Copyright 1999-2002 Johannes Erdfelt, [email protected] |
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* (C) Copyright 1999 Randy Dunlap |
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* (C) Copyright 1999 Georg Acher, [email protected] |
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* (C) Copyright 1999 Deti Fliegl, [email protected] |
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* (C) Copyright 1999 Thomas Sailer, [email protected] |
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* (C) Copyright 1999 Roman Weissgaerber, [email protected] |
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* (C) Copyright 2000 Yggdrasil Computing, Inc. (port of new PCI interface |
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* support from usb-ohci.c by Adam Richter, [email protected]). |
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* (C) Copyright 1999 Gregory P. Smith (from usb-ohci.c) |
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* (C) Copyright 2004-2007 Alan Stern, [email protected] |
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*/ |
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#include "pci-quirks.h" |
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/* |
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* Make sure the controller is completely inactive, unable to |
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* generate interrupts or do DMA. |
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*/ |
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static void uhci_pci_reset_hc(struct uhci_hcd *uhci) |
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{ |
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uhci_reset_hc(to_pci_dev(uhci_dev(uhci)), uhci->io_addr); |
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} |
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/* |
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* Initialize a controller that was newly discovered or has just been |
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* resumed. In either case we can't be sure of its previous state. |
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* |
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* Returns: 1 if the controller was reset, 0 otherwise. |
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*/ |
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static int uhci_pci_check_and_reset_hc(struct uhci_hcd *uhci) |
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{ |
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return uhci_check_and_reset_hc(to_pci_dev(uhci_dev(uhci)), |
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uhci->io_addr); |
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} |
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/* |
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* Store the basic register settings needed by the controller. |
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* This function is called at the end of configure_hc in uhci-hcd.c. |
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*/ |
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static void uhci_pci_configure_hc(struct uhci_hcd *uhci) |
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{ |
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struct pci_dev *pdev = to_pci_dev(uhci_dev(uhci)); |
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/* Enable PIRQ */ |
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pci_write_config_word(pdev, USBLEGSUP, USBLEGSUP_DEFAULT); |
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/* Disable platform-specific non-PME# wakeup */ |
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if (pdev->vendor == PCI_VENDOR_ID_INTEL) |
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pci_write_config_byte(pdev, USBRES_INTEL, 0); |
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} |
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static int uhci_pci_resume_detect_interrupts_are_broken(struct uhci_hcd *uhci) |
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{ |
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int port; |
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switch (to_pci_dev(uhci_dev(uhci))->vendor) { |
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default: |
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break; |
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case PCI_VENDOR_ID_GENESYS: |
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/* Genesys Logic's GL880S controllers don't generate |
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* resume-detect interrupts. |
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*/ |
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return 1; |
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case PCI_VENDOR_ID_INTEL: |
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/* Some of Intel's USB controllers have a bug that causes |
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* resume-detect interrupts if any port has an over-current |
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* condition. To make matters worse, some motherboards |
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* hardwire unused USB ports' over-current inputs active! |
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* To prevent problems, we will not enable resume-detect |
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* interrupts if any ports are OC. |
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*/ |
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for (port = 0; port < uhci->rh_numports; ++port) { |
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if (inw(uhci->io_addr + USBPORTSC1 + port * 2) & |
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USBPORTSC_OC) |
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return 1; |
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} |
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break; |
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} |
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return 0; |
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} |
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static int uhci_pci_global_suspend_mode_is_broken(struct uhci_hcd *uhci) |
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{ |
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int port; |
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const char *sys_info; |
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static const char bad_Asus_board[] = "A7V8X"; |
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/* One of Asus's motherboards has a bug which causes it to |
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* wake up immediately from suspend-to-RAM if any of the ports |
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* are connected. In such cases we will not set EGSM. |
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*/ |
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sys_info = dmi_get_system_info(DMI_BOARD_NAME); |
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if (sys_info && !strcmp(sys_info, bad_Asus_board)) { |
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for (port = 0; port < uhci->rh_numports; ++port) { |
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if (inw(uhci->io_addr + USBPORTSC1 + port * 2) & |
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USBPORTSC_CCS) |
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return 1; |
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} |
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} |
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return 0; |
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} |
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static int uhci_pci_init(struct usb_hcd *hcd) |
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{ |
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struct uhci_hcd *uhci = hcd_to_uhci(hcd); |
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uhci->io_addr = (unsigned long) hcd->rsrc_start; |
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uhci->rh_numports = uhci_count_ports(hcd); |
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/* Intel controllers report the OverCurrent bit active on. |
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* VIA controllers report it active off, so we'll adjust the |
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* bit value. (It's not standardized in the UHCI spec.) |
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*/ |
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if (to_pci_dev(uhci_dev(uhci))->vendor == PCI_VENDOR_ID_VIA) |
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uhci->oc_low = 1; |
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/* HP's server management chip requires a longer port reset delay. */ |
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if (to_pci_dev(uhci_dev(uhci))->vendor == PCI_VENDOR_ID_HP) |
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uhci->wait_for_hp = 1; |
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/* Intel controllers use non-PME wakeup signalling */ |
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if (to_pci_dev(uhci_dev(uhci))->vendor == PCI_VENDOR_ID_INTEL) |
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device_set_wakeup_capable(uhci_dev(uhci), true); |
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/* Set up pointers to PCI-specific functions */ |
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uhci->reset_hc = uhci_pci_reset_hc; |
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uhci->check_and_reset_hc = uhci_pci_check_and_reset_hc; |
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uhci->configure_hc = uhci_pci_configure_hc; |
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uhci->resume_detect_interrupts_are_broken = |
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uhci_pci_resume_detect_interrupts_are_broken; |
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uhci->global_suspend_mode_is_broken = |
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uhci_pci_global_suspend_mode_is_broken; |
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/* Kick BIOS off this hardware and reset if the controller |
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* isn't already safely quiescent. |
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*/ |
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check_and_reset_hc(uhci); |
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return 0; |
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} |
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/* Make sure the controller is quiescent and that we're not using it |
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* any more. This is mainly for the benefit of programs which, like kexec, |
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* expect the hardware to be idle: not doing DMA or generating IRQs. |
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* |
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* This routine may be called in a damaged or failing kernel. Hence we |
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* do not acquire the spinlock before shutting down the controller. |
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*/ |
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static void uhci_shutdown(struct pci_dev *pdev) |
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{ |
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struct usb_hcd *hcd = pci_get_drvdata(pdev); |
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uhci_hc_died(hcd_to_uhci(hcd)); |
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} |
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#ifdef CONFIG_PM |
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static int uhci_pci_resume(struct usb_hcd *hcd, bool hibernated); |
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static int uhci_pci_suspend(struct usb_hcd *hcd, bool do_wakeup) |
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{ |
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struct uhci_hcd *uhci = hcd_to_uhci(hcd); |
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struct pci_dev *pdev = to_pci_dev(uhci_dev(uhci)); |
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int rc = 0; |
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dev_dbg(uhci_dev(uhci), "%s\n", __func__); |
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spin_lock_irq(&uhci->lock); |
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if (!HCD_HW_ACCESSIBLE(hcd) || uhci->dead) |
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goto done_okay; /* Already suspended or dead */ |
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/* All PCI host controllers are required to disable IRQ generation |
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* at the source, so we must turn off PIRQ. |
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*/ |
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pci_write_config_word(pdev, USBLEGSUP, 0); |
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clear_bit(HCD_FLAG_POLL_RH, &hcd->flags); |
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/* Enable platform-specific non-PME# wakeup */ |
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if (do_wakeup) { |
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if (pdev->vendor == PCI_VENDOR_ID_INTEL) |
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pci_write_config_byte(pdev, USBRES_INTEL, |
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USBPORT1EN | USBPORT2EN); |
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} |
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done_okay: |
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clear_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags); |
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spin_unlock_irq(&uhci->lock); |
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synchronize_irq(hcd->irq); |
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/* Check for race with a wakeup request */ |
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if (do_wakeup && HCD_WAKEUP_PENDING(hcd)) { |
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uhci_pci_resume(hcd, false); |
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rc = -EBUSY; |
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} |
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return rc; |
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} |
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static int uhci_pci_resume(struct usb_hcd *hcd, bool hibernated) |
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{ |
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struct uhci_hcd *uhci = hcd_to_uhci(hcd); |
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dev_dbg(uhci_dev(uhci), "%s\n", __func__); |
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/* Since we aren't in D3 any more, it's safe to set this flag |
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* even if the controller was dead. |
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*/ |
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set_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags); |
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spin_lock_irq(&uhci->lock); |
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/* Make sure resume from hibernation re-enumerates everything */ |
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if (hibernated) { |
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uhci->reset_hc(uhci); |
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finish_reset(uhci); |
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} |
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/* The firmware may have changed the controller settings during |
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* a system wakeup. Check it and reconfigure to avoid problems. |
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*/ |
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else { |
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check_and_reset_hc(uhci); |
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} |
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configure_hc(uhci); |
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/* Tell the core if the controller had to be reset */ |
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if (uhci->rh_state == UHCI_RH_RESET) |
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usb_root_hub_lost_power(hcd->self.root_hub); |
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spin_unlock_irq(&uhci->lock); |
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/* If interrupts don't work and remote wakeup is enabled then |
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* the suspended root hub needs to be polled. |
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*/ |
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if (!uhci->RD_enable && hcd->self.root_hub->do_remote_wakeup) |
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set_bit(HCD_FLAG_POLL_RH, &hcd->flags); |
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/* Does the root hub have a port wakeup pending? */ |
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usb_hcd_poll_rh_status(hcd); |
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return 0; |
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} |
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#endif |
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static const struct hc_driver uhci_driver = { |
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.description = hcd_name, |
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.product_desc = "UHCI Host Controller", |
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.hcd_priv_size = sizeof(struct uhci_hcd), |
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/* Generic hardware linkage */ |
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.irq = uhci_irq, |
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.flags = HCD_DMA | HCD_USB11, |
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/* Basic lifecycle operations */ |
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.reset = uhci_pci_init, |
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.start = uhci_start, |
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#ifdef CONFIG_PM |
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.pci_suspend = uhci_pci_suspend, |
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.pci_resume = uhci_pci_resume, |
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.bus_suspend = uhci_rh_suspend, |
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.bus_resume = uhci_rh_resume, |
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#endif |
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.stop = uhci_stop, |
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.urb_enqueue = uhci_urb_enqueue, |
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.urb_dequeue = uhci_urb_dequeue, |
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.endpoint_disable = uhci_hcd_endpoint_disable, |
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.get_frame_number = uhci_hcd_get_frame_number, |
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.hub_status_data = uhci_hub_status_data, |
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.hub_control = uhci_hub_control, |
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}; |
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static const struct pci_device_id uhci_pci_ids[] = { { |
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/* handle any USB UHCI controller */ |
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PCI_DEVICE_CLASS(PCI_CLASS_SERIAL_USB_UHCI, ~0), |
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}, { /* end: all zeroes */ } |
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}; |
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MODULE_DEVICE_TABLE(pci, uhci_pci_ids); |
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static int uhci_pci_probe(struct pci_dev *dev, const struct pci_device_id *id) |
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{ |
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return usb_hcd_pci_probe(dev, id, &uhci_driver); |
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} |
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static struct pci_driver uhci_pci_driver = { |
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.name = hcd_name, |
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.id_table = uhci_pci_ids, |
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.probe = uhci_pci_probe, |
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.remove = usb_hcd_pci_remove, |
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.shutdown = uhci_shutdown, |
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#ifdef CONFIG_PM |
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.driver = { |
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.pm = &usb_hcd_pci_pm_ops |
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}, |
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#endif |
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}; |
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MODULE_SOFTDEP("pre: ehci_pci");
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