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");
61 ehci_port_power(ehci, 0);
66 /* called during probe() after chip reset completes */
67 static int ehci_pci_setup(struct usb_hcd *hcd)
69 struct ehci_hcd *ehci = hcd_to_ehci(hcd);
70 struct pci_dev *pdev = to_pci_dev(hcd->self.controller);
74 switch (pdev->vendor) {
75 case PCI_VENDOR_ID_TOSHIBA_2:
76 /* celleb's companion chip */
77 if (pdev->device == 0x01b5) {
78 #ifdef CONFIG_USB_EHCI_BIG_ENDIAN_MMIO
79 ehci->big_endian_mmio = 1;
82 "unsupported big endian Toshiba quirk\n");
88 ehci->caps = hcd->regs;
89 ehci->regs = hcd->regs +
90 HC_LENGTH(ehci_readl(ehci, &ehci->caps->hc_capbase));
92 dbg_hcs_params(ehci, "reset");
93 dbg_hcc_params(ehci, "reset");
95 /* ehci_init() causes memory for DMA transfers to be
96 * allocated. Thus, any vendor-specific workarounds based on
97 * limiting the type of memory used for DMA transfers must
98 * happen before ehci_init() is called. */
99 switch (pdev->vendor) {
100 case PCI_VENDOR_ID_NVIDIA:
101 /* NVidia reports that certain chips don't handle
102 * QH, ITD, or SITD addresses above 2GB. (But TD,
103 * data buffer, and periodic schedule are normal.)
105 switch (pdev->device) {
106 case 0x003c: /* MCP04 */
107 case 0x005b: /* CK804 */
108 case 0x00d8: /* CK8 */
109 case 0x00e8: /* CK8S */
110 if (pci_set_consistent_dma_mask(pdev,
112 ehci_warn(ehci, "can't enable NVidia "
113 "workaround for >2GB RAM\n");
119 /* cache this readonly data; minimize chip reads */
120 ehci->hcs_params = ehci_readl(ehci, &ehci->caps->hcs_params);
122 retval = ehci_halt(ehci);
126 /* data structure init */
127 retval = ehci_init(hcd);
131 switch (pdev->vendor) {
132 case PCI_VENDOR_ID_TDI:
133 if (pdev->device == PCI_DEVICE_ID_TDI_EHCI) {
134 ehci->is_tdi_rh_tt = 1;
138 case PCI_VENDOR_ID_AMD:
139 /* AMD8111 EHCI doesn't work, according to AMD errata */
140 if (pdev->device == 0x7463) {
141 ehci_info(ehci, "ignoring AMD8111 (errata)\n");
146 case PCI_VENDOR_ID_NVIDIA:
147 switch (pdev->device) {
148 /* Some NForce2 chips have problems with selective suspend;
149 * fixed in newer silicon.
152 if (pdev->revision < 0xa4)
153 ehci->no_selective_suspend = 1;
159 if (ehci_is_TDI(ehci))
162 /* at least the Genesys GL880S needs fixup here */
163 temp = HCS_N_CC(ehci->hcs_params) * HCS_N_PCC(ehci->hcs_params);
165 if (temp && HCS_N_PORTS(ehci->hcs_params) > temp) {
166 ehci_dbg(ehci, "bogus port configuration: "
167 "cc=%d x pcc=%d < ports=%d\n",
168 HCS_N_CC(ehci->hcs_params),
169 HCS_N_PCC(ehci->hcs_params),
170 HCS_N_PORTS(ehci->hcs_params));
172 switch (pdev->vendor) {
173 case 0x17a0: /* GENESYS */
174 /* GL880S: should be PORTS=2 */
175 temp |= (ehci->hcs_params & ~0xf);
176 ehci->hcs_params = temp;
178 case PCI_VENDOR_ID_NVIDIA:
179 /* NF4: should be PCC=10 */
184 /* Serial Bus Release Number is at PCI 0x60 offset */
185 pci_read_config_byte(pdev, 0x60, &ehci->sbrn);
187 /* Workaround current PCI init glitch: wakeup bits aren't
188 * being set from PCI PM capability.
190 if (!device_can_wakeup(&pdev->dev)) {
193 pci_read_config_word(pdev, 0x62, &port_wake);
194 if (port_wake & 0x0001)
195 device_init_wakeup(&pdev->dev, 1);
198 #ifdef CONFIG_USB_SUSPEND
199 /* REVISIT: the controller works fine for wakeup iff the root hub
200 * itself is "globally" suspended, but usbcore currently doesn't
201 * understand such things.
203 * System suspend currently expects to be able to suspend the entire
204 * device tree, device-at-a-time. If we failed selective suspend
205 * reports, system suspend would fail; so the root hub code must claim
206 * success. That's lying to usbcore, and it matters for for runtime
207 * PM scenarios with selective suspend and remote wakeup...
209 if (ehci->no_selective_suspend && device_can_wakeup(&pdev->dev))
210 ehci_warn(ehci, "selective suspend/wakeup unavailable\n");
213 retval = ehci_pci_reinit(ehci, pdev);
218 /*-------------------------------------------------------------------------*/
222 /* suspend/resume, section 4.3 */
224 /* These routines rely on the PCI bus glue
225 * to handle powerdown and wakeup, and currently also on
226 * transceivers that don't need any software attention to set up
227 * the right sort of wakeup.
228 * Also they depend on separate root hub suspend/resume.
231 static int ehci_pci_suspend(struct usb_hcd *hcd, pm_message_t message)
233 struct ehci_hcd *ehci = hcd_to_ehci(hcd);
237 if (time_before(jiffies, ehci->next_statechange))
240 /* Root hub was already suspended. Disable irq emission and
241 * mark HW unaccessible, bail out if RH has been resumed. Use
242 * the spinlock to properly synchronize with possible pending
243 * RH suspend or resume activity.
245 * This is still racy as hcd->state is manipulated outside of
246 * any locks =P But that will be a different fix.
248 spin_lock_irqsave (&ehci->lock, flags);
249 if (hcd->state != HC_STATE_SUSPENDED) {
253 ehci_writel(ehci, 0, &ehci->regs->intr_enable);
254 (void)ehci_readl(ehci, &ehci->regs->intr_enable);
256 /* make sure snapshot being resumed re-enumerates everything */
257 if (message.event == PM_EVENT_PRETHAW) {
262 clear_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags);
264 spin_unlock_irqrestore (&ehci->lock, flags);
266 // could save FLADJ in case of Vaux power loss
267 // ... we'd only use it to handle clock skew
272 static int ehci_pci_resume(struct usb_hcd *hcd)
274 struct ehci_hcd *ehci = hcd_to_ehci(hcd);
275 struct pci_dev *pdev = to_pci_dev(hcd->self.controller);
277 // maybe restore FLADJ
279 if (time_before(jiffies, ehci->next_statechange))
282 /* Mark hardware accessible again as we are out of D3 state by now */
283 set_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags);
285 /* If CF is still set, we maintained PCI Vaux power.
286 * Just undo the effect of ehci_pci_suspend().
288 if (ehci_readl(ehci, &ehci->regs->configured_flag) == FLAG_CF) {
289 int mask = INTR_MASK;
291 if (!device_may_wakeup(&hcd->self.root_hub->dev))
293 ehci_writel(ehci, mask, &ehci->regs->intr_enable);
294 ehci_readl(ehci, &ehci->regs->intr_enable);
298 ehci_dbg(ehci, "lost power, restarting\n");
299 usb_root_hub_lost_power(hcd->self.root_hub);
301 /* Else reset, to cope with power loss or flush-to-storage
302 * style "resume" having let BIOS kick in during reboot.
304 (void) ehci_halt(ehci);
305 (void) ehci_reset(ehci);
306 (void) ehci_pci_reinit(ehci, pdev);
308 /* emptying the schedule aborts any urbs */
309 spin_lock_irq(&ehci->lock);
311 ehci->reclaim_ready = 1;
313 spin_unlock_irq(&ehci->lock);
315 ehci_writel(ehci, ehci->command, &ehci->regs->command);
316 ehci_writel(ehci, FLAG_CF, &ehci->regs->configured_flag);
317 ehci_readl(ehci, &ehci->regs->command); /* unblock posted writes */
319 /* here we "know" root ports should always stay powered */
320 ehci_port_power(ehci, 1);
321 ehci_handover_companion_ports(ehci);
323 hcd->state = HC_STATE_SUSPENDED;
328 static const struct hc_driver ehci_pci_hc_driver = {
329 .description = hcd_name,
330 .product_desc = "EHCI Host Controller",
331 .hcd_priv_size = sizeof(struct ehci_hcd),
334 * generic hardware linkage
337 .flags = HCD_MEMORY | HCD_USB2,
340 * basic lifecycle operations
342 .reset = ehci_pci_setup,
345 .suspend = ehci_pci_suspend,
346 .resume = ehci_pci_resume,
349 .shutdown = ehci_shutdown,
352 * managing i/o requests and associated device resources
354 .urb_enqueue = ehci_urb_enqueue,
355 .urb_dequeue = ehci_urb_dequeue,
356 .endpoint_disable = ehci_endpoint_disable,
361 .get_frame_number = ehci_get_frame,
366 .hub_status_data = ehci_hub_status_data,
367 .hub_control = ehci_hub_control,
368 .bus_suspend = ehci_bus_suspend,
369 .bus_resume = ehci_bus_resume,
372 /*-------------------------------------------------------------------------*/
374 /* PCI driver selection metadata; PCI hotplugging uses this */
375 static const struct pci_device_id pci_ids [] = { {
376 /* handle any USB 2.0 EHCI controller */
377 PCI_DEVICE_CLASS(PCI_CLASS_SERIAL_USB_EHCI, ~0),
378 .driver_data = (unsigned long) &ehci_pci_hc_driver,
380 { /* end: all zeroes */ }
382 MODULE_DEVICE_TABLE(pci, pci_ids);
384 /* pci driver glue; this is a "new style" PCI driver module */
385 static struct pci_driver ehci_pci_driver = {
386 .name = (char *) hcd_name,
389 .probe = usb_hcd_pci_probe,
390 .remove = usb_hcd_pci_remove,
393 .suspend = usb_hcd_pci_suspend,
394 .resume = usb_hcd_pci_resume,
396 .shutdown = usb_hcd_pci_shutdown,