2 * EHCI HCD (Host Controller Driver) PCI Bus Glue.
4 * Copyright (c) 2000-2004 by David Brownell
6 * This program is free software; you can redistribute it and/or modify it
7 * under the terms of the GNU General Public License as published by the
8 * Free Software Foundation; either version 2 of the License, or (at your
9 * option) any later version.
11 * This program is distributed in the hope that it will be useful, but
12 * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
13 * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
16 * You should have received a copy of the GNU General Public License
17 * along with this program; if not, write to the Free Software Foundation,
18 * Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
22 #error "This file is PCI bus glue. CONFIG_PCI must be defined."
25 /*-------------------------------------------------------------------------*/
27 /* called after powerup, by probe or system-pm "wakeup" */
28 static int ehci_pci_reinit(struct ehci_hcd *ehci, struct pci_dev *pdev)
33 /* optional debug port, normally in the first BAR */
34 temp = pci_find_capability(pdev, 0x0a);
36 pci_read_config_dword(pdev, temp, &temp);
38 if ((temp & (3 << 13)) == (1 << 13)) {
40 ehci->debug = ehci_to_hcd(ehci)->regs + temp;
41 temp = ehci_readl(ehci, &ehci->debug->control);
42 ehci_info(ehci, "debug port %d%s\n",
43 HCS_DEBUG_PORT(ehci->hcs_params),
47 if (!(temp & DBGP_ENABLED))
52 /* we expect static quirk code to handle the "extended capabilities"
53 * (currently just BIOS handoff) allowed starting with EHCI 0.96
56 /* PCI Memory-Write-Invalidate cycle support is optional (uncommon) */
57 retval = pci_set_mwi(pdev);
59 ehci_dbg(ehci, "MWI active\n");
64 /* called during probe() after chip reset completes */
65 static int ehci_pci_setup(struct usb_hcd *hcd)
67 struct ehci_hcd *ehci = hcd_to_ehci(hcd);
68 struct pci_dev *pdev = to_pci_dev(hcd->self.controller);
72 switch (pdev->vendor) {
73 case PCI_VENDOR_ID_TOSHIBA_2:
74 /* celleb's companion chip */
75 if (pdev->device == 0x01b5) {
76 #ifdef CONFIG_USB_EHCI_BIG_ENDIAN_MMIO
77 ehci->big_endian_mmio = 1;
80 "unsupported big endian Toshiba quirk\n");
86 ehci->caps = hcd->regs;
87 ehci->regs = hcd->regs +
88 HC_LENGTH(ehci_readl(ehci, &ehci->caps->hc_capbase));
90 dbg_hcs_params(ehci, "reset");
91 dbg_hcc_params(ehci, "reset");
93 /* ehci_init() causes memory for DMA transfers to be
94 * allocated. Thus, any vendor-specific workarounds based on
95 * limiting the type of memory used for DMA transfers must
96 * happen before ehci_init() is called. */
97 switch (pdev->vendor) {
98 case PCI_VENDOR_ID_NVIDIA:
99 /* NVidia reports that certain chips don't handle
100 * QH, ITD, or SITD addresses above 2GB. (But TD,
101 * data buffer, and periodic schedule are normal.)
103 switch (pdev->device) {
104 case 0x003c: /* MCP04 */
105 case 0x005b: /* CK804 */
106 case 0x00d8: /* CK8 */
107 case 0x00e8: /* CK8S */
108 if (pci_set_consistent_dma_mask(pdev,
110 ehci_warn(ehci, "can't enable NVidia "
111 "workaround for >2GB RAM\n");
117 /* cache this readonly data; minimize chip reads */
118 ehci->hcs_params = ehci_readl(ehci, &ehci->caps->hcs_params);
120 retval = ehci_halt(ehci);
124 /* data structure init */
125 retval = ehci_init(hcd);
129 switch (pdev->vendor) {
130 case PCI_VENDOR_ID_TDI:
131 if (pdev->device == PCI_DEVICE_ID_TDI_EHCI) {
136 case PCI_VENDOR_ID_AMD:
137 /* AMD8111 EHCI doesn't work, according to AMD errata */
138 if (pdev->device == 0x7463) {
139 ehci_info(ehci, "ignoring AMD8111 (errata)\n");
144 case PCI_VENDOR_ID_NVIDIA:
145 switch (pdev->device) {
146 /* Some NForce2 chips have problems with selective suspend;
147 * fixed in newer silicon.
150 if (pdev->revision < 0xa4)
151 ehci->no_selective_suspend = 1;
155 case PCI_VENDOR_ID_VIA:
156 if (pdev->device == 0x3104 && (pdev->revision & 0xf0) == 0x60) {
159 /* The VT6212 defaults to a 1 usec EHCI sleep time which
160 * hogs the PCI bus *badly*. Setting bit 5 of 0x4B makes
161 * that sleep time use the conventional 10 usec.
163 pci_read_config_byte(pdev, 0x4b, &tmp);
166 pci_write_config_byte(pdev, 0x4b, tmp | 0x20);
173 /* at least the Genesys GL880S needs fixup here */
174 temp = HCS_N_CC(ehci->hcs_params) * HCS_N_PCC(ehci->hcs_params);
176 if (temp && HCS_N_PORTS(ehci->hcs_params) > temp) {
177 ehci_dbg(ehci, "bogus port configuration: "
178 "cc=%d x pcc=%d < ports=%d\n",
179 HCS_N_CC(ehci->hcs_params),
180 HCS_N_PCC(ehci->hcs_params),
181 HCS_N_PORTS(ehci->hcs_params));
183 switch (pdev->vendor) {
184 case 0x17a0: /* GENESYS */
185 /* GL880S: should be PORTS=2 */
186 temp |= (ehci->hcs_params & ~0xf);
187 ehci->hcs_params = temp;
189 case PCI_VENDOR_ID_NVIDIA:
190 /* NF4: should be PCC=10 */
195 /* Serial Bus Release Number is at PCI 0x60 offset */
196 pci_read_config_byte(pdev, 0x60, &ehci->sbrn);
198 /* Workaround current PCI init glitch: wakeup bits aren't
199 * being set from PCI PM capability.
201 if (!device_can_wakeup(&pdev->dev)) {
204 pci_read_config_word(pdev, 0x62, &port_wake);
205 if (port_wake & 0x0001)
206 device_init_wakeup(&pdev->dev, 1);
209 #ifdef CONFIG_USB_SUSPEND
210 /* REVISIT: the controller works fine for wakeup iff the root hub
211 * itself is "globally" suspended, but usbcore currently doesn't
212 * understand such things.
214 * System suspend currently expects to be able to suspend the entire
215 * device tree, device-at-a-time. If we failed selective suspend
216 * reports, system suspend would fail; so the root hub code must claim
217 * success. That's lying to usbcore, and it matters for for runtime
218 * PM scenarios with selective suspend and remote wakeup...
220 if (ehci->no_selective_suspend && device_can_wakeup(&pdev->dev))
221 ehci_warn(ehci, "selective suspend/wakeup unavailable\n");
224 ehci_port_power(ehci, 1);
225 retval = ehci_pci_reinit(ehci, pdev);
230 /*-------------------------------------------------------------------------*/
234 /* suspend/resume, section 4.3 */
236 /* These routines rely on the PCI bus glue
237 * to handle powerdown and wakeup, and currently also on
238 * transceivers that don't need any software attention to set up
239 * the right sort of wakeup.
240 * Also they depend on separate root hub suspend/resume.
243 static int ehci_pci_suspend(struct usb_hcd *hcd, pm_message_t message)
245 struct ehci_hcd *ehci = hcd_to_ehci(hcd);
249 if (time_before(jiffies, ehci->next_statechange))
252 /* Root hub was already suspended. Disable irq emission and
253 * mark HW unaccessible, bail out if RH has been resumed. Use
254 * the spinlock to properly synchronize with possible pending
255 * RH suspend or resume activity.
257 * This is still racy as hcd->state is manipulated outside of
258 * any locks =P But that will be a different fix.
260 spin_lock_irqsave (&ehci->lock, flags);
261 if (hcd->state != HC_STATE_SUSPENDED) {
265 ehci_writel(ehci, 0, &ehci->regs->intr_enable);
266 (void)ehci_readl(ehci, &ehci->regs->intr_enable);
268 /* make sure snapshot being resumed re-enumerates everything */
269 if (message.event == PM_EVENT_PRETHAW) {
274 clear_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags);
276 spin_unlock_irqrestore (&ehci->lock, flags);
278 // could save FLADJ in case of Vaux power loss
279 // ... we'd only use it to handle clock skew
284 static int ehci_pci_resume(struct usb_hcd *hcd)
286 struct ehci_hcd *ehci = hcd_to_ehci(hcd);
287 struct pci_dev *pdev = to_pci_dev(hcd->self.controller);
289 // maybe restore FLADJ
291 if (time_before(jiffies, ehci->next_statechange))
294 /* Mark hardware accessible again as we are out of D3 state by now */
295 set_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags);
297 /* If CF is still set, we maintained PCI Vaux power.
298 * Just undo the effect of ehci_pci_suspend().
300 if (ehci_readl(ehci, &ehci->regs->configured_flag) == FLAG_CF) {
301 int mask = INTR_MASK;
303 if (!hcd->self.root_hub->do_remote_wakeup)
305 ehci_writel(ehci, mask, &ehci->regs->intr_enable);
306 ehci_readl(ehci, &ehci->regs->intr_enable);
310 ehci_dbg(ehci, "lost power, restarting\n");
311 usb_root_hub_lost_power(hcd->self.root_hub);
313 /* Else reset, to cope with power loss or flush-to-storage
314 * style "resume" having let BIOS kick in during reboot.
316 (void) ehci_halt(ehci);
317 (void) ehci_reset(ehci);
318 (void) ehci_pci_reinit(ehci, pdev);
320 /* emptying the schedule aborts any urbs */
321 spin_lock_irq(&ehci->lock);
323 end_unlink_async(ehci);
325 spin_unlock_irq(&ehci->lock);
327 ehci_writel(ehci, ehci->command, &ehci->regs->command);
328 ehci_writel(ehci, FLAG_CF, &ehci->regs->configured_flag);
329 ehci_readl(ehci, &ehci->regs->command); /* unblock posted writes */
331 /* here we "know" root ports should always stay powered */
332 ehci_port_power(ehci, 1);
334 hcd->state = HC_STATE_SUSPENDED;
339 static const struct hc_driver ehci_pci_hc_driver = {
340 .description = hcd_name,
341 .product_desc = "EHCI Host Controller",
342 .hcd_priv_size = sizeof(struct ehci_hcd),
345 * generic hardware linkage
348 .flags = HCD_MEMORY | HCD_USB2,
351 * basic lifecycle operations
353 .reset = ehci_pci_setup,
356 .pci_suspend = ehci_pci_suspend,
357 .pci_resume = ehci_pci_resume,
360 .shutdown = ehci_shutdown,
363 * managing i/o requests and associated device resources
365 .urb_enqueue = ehci_urb_enqueue,
366 .urb_dequeue = ehci_urb_dequeue,
367 .endpoint_disable = ehci_endpoint_disable,
372 .get_frame_number = ehci_get_frame,
377 .hub_status_data = ehci_hub_status_data,
378 .hub_control = ehci_hub_control,
379 .bus_suspend = ehci_bus_suspend,
380 .bus_resume = ehci_bus_resume,
381 .relinquish_port = ehci_relinquish_port,
382 .port_handed_over = ehci_port_handed_over,
385 /*-------------------------------------------------------------------------*/
387 /* PCI driver selection metadata; PCI hotplugging uses this */
388 static const struct pci_device_id pci_ids [] = { {
389 /* handle any USB 2.0 EHCI controller */
390 PCI_DEVICE_CLASS(PCI_CLASS_SERIAL_USB_EHCI, ~0),
391 .driver_data = (unsigned long) &ehci_pci_hc_driver,
393 { /* end: all zeroes */ }
395 MODULE_DEVICE_TABLE(pci, pci_ids);
397 /* pci driver glue; this is a "new style" PCI driver module */
398 static struct pci_driver ehci_pci_driver = {
399 .name = (char *) hcd_name,
402 .probe = usb_hcd_pci_probe,
403 .remove = usb_hcd_pci_remove,
406 .suspend = usb_hcd_pci_suspend,
407 .resume = usb_hcd_pci_resume,
409 .shutdown = usb_hcd_pci_shutdown,