1 // SPDX-License-Identifier: GPL-2.0
3 * UHCI HCD (Host Controller Driver) PCI Bus Glue.
5 * Extracted from uhci-hcd.c:
6 * Maintainer: Alan Stern <stern@rowland.harvard.edu>
8 * (C) Copyright 1999 Linus Torvalds
9 * (C) Copyright 1999-2002 Johannes Erdfelt, johannes@erdfelt.com
10 * (C) Copyright 1999 Randy Dunlap
11 * (C) Copyright 1999 Georg Acher, acher@in.tum.de
12 * (C) Copyright 1999 Deti Fliegl, deti@fliegl.de
13 * (C) Copyright 1999 Thomas Sailer, sailer@ife.ee.ethz.ch
14 * (C) Copyright 1999 Roman Weissgaerber, weissg@vienna.at
15 * (C) Copyright 2000 Yggdrasil Computing, Inc. (port of new PCI interface
16 * support from usb-ohci.c by Adam Richter, adam@yggdrasil.com).
17 * (C) Copyright 1999 Gregory P. Smith (from usb-ohci.c)
18 * (C) Copyright 2004-2007 Alan Stern, stern@rowland.harvard.edu
21 #include "pci-quirks.h"
24 * Make sure the controller is completely inactive, unable to
25 * generate interrupts or do DMA.
27 static void uhci_pci_reset_hc(struct uhci_hcd *uhci)
29 uhci_reset_hc(to_pci_dev(uhci_dev(uhci)), uhci->io_addr);
33 * Initialize a controller that was newly discovered or has just been
34 * resumed. In either case we can't be sure of its previous state.
36 * Returns: 1 if the controller was reset, 0 otherwise.
38 static int uhci_pci_check_and_reset_hc(struct uhci_hcd *uhci)
40 return uhci_check_and_reset_hc(to_pci_dev(uhci_dev(uhci)),
45 * Store the basic register settings needed by the controller.
46 * This function is called at the end of configure_hc in uhci-hcd.c.
48 static void uhci_pci_configure_hc(struct uhci_hcd *uhci)
50 struct pci_dev *pdev = to_pci_dev(uhci_dev(uhci));
53 pci_write_config_word(pdev, USBLEGSUP, USBLEGSUP_DEFAULT);
55 /* Disable platform-specific non-PME# wakeup */
56 if (pdev->vendor == PCI_VENDOR_ID_INTEL)
57 pci_write_config_byte(pdev, USBRES_INTEL, 0);
60 static int uhci_pci_resume_detect_interrupts_are_broken(struct uhci_hcd *uhci)
64 switch (to_pci_dev(uhci_dev(uhci))->vendor) {
68 case PCI_VENDOR_ID_GENESYS:
69 /* Genesys Logic's GL880S controllers don't generate
70 * resume-detect interrupts.
74 case PCI_VENDOR_ID_INTEL:
75 /* Some of Intel's USB controllers have a bug that causes
76 * resume-detect interrupts if any port has an over-current
77 * condition. To make matters worse, some motherboards
78 * hardwire unused USB ports' over-current inputs active!
79 * To prevent problems, we will not enable resume-detect
80 * interrupts if any ports are OC.
82 for (port = 0; port < uhci->rh_numports; ++port) {
83 if (inw(uhci->io_addr + USBPORTSC1 + port * 2) &
92 static int uhci_pci_global_suspend_mode_is_broken(struct uhci_hcd *uhci)
96 static const char bad_Asus_board[] = "A7V8X";
98 /* One of Asus's motherboards has a bug which causes it to
99 * wake up immediately from suspend-to-RAM if any of the ports
100 * are connected. In such cases we will not set EGSM.
102 sys_info = dmi_get_system_info(DMI_BOARD_NAME);
103 if (sys_info && !strcmp(sys_info, bad_Asus_board)) {
104 for (port = 0; port < uhci->rh_numports; ++port) {
105 if (inw(uhci->io_addr + USBPORTSC1 + port * 2) &
114 static int uhci_pci_init(struct usb_hcd *hcd)
116 struct uhci_hcd *uhci = hcd_to_uhci(hcd);
118 uhci->io_addr = (unsigned long) hcd->rsrc_start;
120 uhci->rh_numports = uhci_count_ports(hcd);
123 * Intel controllers report the OverCurrent bit active on. VIA
124 * and ZHAOXIN controllers report it active off, so we'll adjust
125 * the bit value. (It's not standardized in the UHCI spec.)
127 if (to_pci_dev(uhci_dev(uhci))->vendor == PCI_VENDOR_ID_VIA ||
128 to_pci_dev(uhci_dev(uhci))->vendor == PCI_VENDOR_ID_ZHAOXIN)
131 /* HP's server management chip requires a longer port reset delay. */
132 if (to_pci_dev(uhci_dev(uhci))->vendor == PCI_VENDOR_ID_HP)
133 uhci->wait_for_hp = 1;
135 /* Intel controllers use non-PME wakeup signalling */
136 if (to_pci_dev(uhci_dev(uhci))->vendor == PCI_VENDOR_ID_INTEL)
137 device_set_wakeup_capable(uhci_dev(uhci), true);
139 /* Set up pointers to PCI-specific functions */
140 uhci->reset_hc = uhci_pci_reset_hc;
141 uhci->check_and_reset_hc = uhci_pci_check_and_reset_hc;
142 uhci->configure_hc = uhci_pci_configure_hc;
143 uhci->resume_detect_interrupts_are_broken =
144 uhci_pci_resume_detect_interrupts_are_broken;
145 uhci->global_suspend_mode_is_broken =
146 uhci_pci_global_suspend_mode_is_broken;
149 /* Kick BIOS off this hardware and reset if the controller
150 * isn't already safely quiescent.
152 check_and_reset_hc(uhci);
156 /* Make sure the controller is quiescent and that we're not using it
157 * any more. This is mainly for the benefit of programs which, like kexec,
158 * expect the hardware to be idle: not doing DMA or generating IRQs.
160 * This routine may be called in a damaged or failing kernel. Hence we
161 * do not acquire the spinlock before shutting down the controller.
163 static void uhci_shutdown(struct pci_dev *pdev)
165 struct usb_hcd *hcd = pci_get_drvdata(pdev);
167 uhci_hc_died(hcd_to_uhci(hcd));
172 static int uhci_pci_resume(struct usb_hcd *hcd, pm_message_t state);
174 static int uhci_pci_suspend(struct usb_hcd *hcd, bool do_wakeup)
176 struct uhci_hcd *uhci = hcd_to_uhci(hcd);
177 struct pci_dev *pdev = to_pci_dev(uhci_dev(uhci));
180 dev_dbg(uhci_dev(uhci), "%s\n", __func__);
182 spin_lock_irq(&uhci->lock);
183 if (!HCD_HW_ACCESSIBLE(hcd) || uhci->dead)
184 goto done_okay; /* Already suspended or dead */
186 /* All PCI host controllers are required to disable IRQ generation
187 * at the source, so we must turn off PIRQ.
189 pci_write_config_word(pdev, USBLEGSUP, 0);
190 clear_bit(HCD_FLAG_POLL_RH, &hcd->flags);
192 /* Enable platform-specific non-PME# wakeup */
194 if (pdev->vendor == PCI_VENDOR_ID_INTEL)
195 pci_write_config_byte(pdev, USBRES_INTEL,
196 USBPORT1EN | USBPORT2EN);
200 clear_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags);
201 spin_unlock_irq(&uhci->lock);
203 synchronize_irq(hcd->irq);
205 /* Check for race with a wakeup request */
206 if (do_wakeup && HCD_WAKEUP_PENDING(hcd)) {
207 uhci_pci_resume(hcd, PMSG_SUSPEND);
213 static int uhci_pci_resume(struct usb_hcd *hcd, pm_message_t msg)
215 bool hibernated = (msg.event == PM_EVENT_RESTORE);
216 struct uhci_hcd *uhci = hcd_to_uhci(hcd);
218 dev_dbg(uhci_dev(uhci), "%s\n", __func__);
220 /* Since we aren't in D3 any more, it's safe to set this flag
221 * even if the controller was dead.
223 set_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags);
225 spin_lock_irq(&uhci->lock);
227 /* Make sure resume from hibernation re-enumerates everything */
229 uhci->reset_hc(uhci);
233 /* The firmware may have changed the controller settings during
234 * a system wakeup. Check it and reconfigure to avoid problems.
237 check_and_reset_hc(uhci);
241 /* Tell the core if the controller had to be reset */
242 if (uhci->rh_state == UHCI_RH_RESET)
243 usb_root_hub_lost_power(hcd->self.root_hub);
245 spin_unlock_irq(&uhci->lock);
247 /* If interrupts don't work and remote wakeup is enabled then
248 * the suspended root hub needs to be polled.
250 if (!uhci->RD_enable && hcd->self.root_hub->do_remote_wakeup)
251 set_bit(HCD_FLAG_POLL_RH, &hcd->flags);
253 /* Does the root hub have a port wakeup pending? */
254 usb_hcd_poll_rh_status(hcd);
260 static const struct hc_driver uhci_driver = {
261 .description = hcd_name,
262 .product_desc = "UHCI Host Controller",
263 .hcd_priv_size = sizeof(struct uhci_hcd),
265 /* Generic hardware linkage */
267 .flags = HCD_DMA | HCD_USB11,
269 /* Basic lifecycle operations */
270 .reset = uhci_pci_init,
273 .pci_suspend = uhci_pci_suspend,
274 .pci_resume = uhci_pci_resume,
275 .bus_suspend = uhci_rh_suspend,
276 .bus_resume = uhci_rh_resume,
280 .urb_enqueue = uhci_urb_enqueue,
281 .urb_dequeue = uhci_urb_dequeue,
283 .endpoint_disable = uhci_hcd_endpoint_disable,
284 .get_frame_number = uhci_hcd_get_frame_number,
286 .hub_status_data = uhci_hub_status_data,
287 .hub_control = uhci_hub_control,
290 static const struct pci_device_id uhci_pci_ids[] = { {
291 /* handle any USB UHCI controller */
292 PCI_DEVICE_CLASS(PCI_CLASS_SERIAL_USB_UHCI, ~0),
293 }, { /* end: all zeroes */ }
296 MODULE_DEVICE_TABLE(pci, uhci_pci_ids);
298 static int uhci_pci_probe(struct pci_dev *dev, const struct pci_device_id *id)
300 return usb_hcd_pci_probe(dev, &uhci_driver);
303 static struct pci_driver uhci_pci_driver = {
305 .id_table = uhci_pci_ids,
307 .probe = uhci_pci_probe,
308 .remove = usb_hcd_pci_remove,
309 .shutdown = uhci_shutdown,
313 .pm = &usb_hcd_pci_pm_ops
318 MODULE_SOFTDEP("pre: ehci_pci");