316 lines
8.6 KiB
C
316 lines
8.6 KiB
C
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// 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 <stern@rowland.harvard.edu>
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*
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* (C) Copyright 1999 Linus Torvalds
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* (C) Copyright 1999-2002 Johannes Erdfelt, johannes@erdfelt.com
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* (C) Copyright 1999 Randy Dunlap
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* (C) Copyright 1999 Georg Acher, acher@in.tum.de
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* (C) Copyright 1999 Deti Fliegl, deti@fliegl.de
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* (C) Copyright 1999 Thomas Sailer, sailer@ife.ee.ethz.ch
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* (C) Copyright 1999 Roman Weissgaerber, weissg@vienna.at
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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, adam@yggdrasil.com).
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* (C) Copyright 1999 Gregory P. Smith (from usb-ohci.c)
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* (C) Copyright 2004-2007 Alan Stern, stern@rowland.harvard.edu
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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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