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 = readl(&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 ehci->caps = hcd->regs;
75 ehci->regs = hcd->regs + HC_LENGTH(readl(&ehci->caps->hc_capbase));
76 dbg_hcs_params(ehci, "reset");
77 dbg_hcc_params(ehci, "reset");
79 /* ehci_init() causes memory for DMA transfers to be
80 * allocated. Thus, any vendor-specific workarounds based on
81 * limiting the type of memory used for DMA transfers must
82 * happen before ehci_init() is called. */
83 switch (pdev->vendor) {
84 case PCI_VENDOR_ID_NVIDIA:
85 /* NVidia reports that certain chips don't handle
86 * QH, ITD, or SITD addresses above 2GB. (But TD,
87 * data buffer, and periodic schedule are normal.)
89 switch (pdev->device) {
90 case 0x003c: /* MCP04 */
91 case 0x005b: /* CK804 */
92 case 0x00d8: /* CK8 */
93 case 0x00e8: /* CK8S */
94 if (pci_set_consistent_dma_mask(pdev,
96 ehci_warn(ehci, "can't enable NVidia "
97 "workaround for >2GB RAM\n");
103 /* cache this readonly data; minimize chip reads */
104 ehci->hcs_params = readl(&ehci->caps->hcs_params);
106 retval = ehci_halt(ehci);
110 /* data structure init */
111 retval = ehci_init(hcd);
115 switch (pdev->vendor) {
116 case PCI_VENDOR_ID_TDI:
117 if (pdev->device == PCI_DEVICE_ID_TDI_EHCI) {
118 ehci->is_tdi_rh_tt = 1;
122 case PCI_VENDOR_ID_AMD:
123 /* AMD8111 EHCI doesn't work, according to AMD errata */
124 if (pdev->device == 0x7463) {
125 ehci_info(ehci, "ignoring AMD8111 (errata)\n");
130 case PCI_VENDOR_ID_NVIDIA:
131 switch (pdev->device) {
132 /* Some NForce2 chips have problems with selective suspend;
133 * fixed in newer silicon.
136 pci_read_config_dword(pdev, PCI_REVISION_ID, &temp);
137 if ((temp & 0xff) < 0xa4)
138 ehci->no_selective_suspend = 1;
144 if (ehci_is_TDI(ehci))
147 /* at least the Genesys GL880S needs fixup here */
148 temp = HCS_N_CC(ehci->hcs_params) * HCS_N_PCC(ehci->hcs_params);
150 if (temp && HCS_N_PORTS(ehci->hcs_params) > temp) {
151 ehci_dbg(ehci, "bogus port configuration: "
152 "cc=%d x pcc=%d < ports=%d\n",
153 HCS_N_CC(ehci->hcs_params),
154 HCS_N_PCC(ehci->hcs_params),
155 HCS_N_PORTS(ehci->hcs_params));
157 switch (pdev->vendor) {
158 case 0x17a0: /* GENESYS */
159 /* GL880S: should be PORTS=2 */
160 temp |= (ehci->hcs_params & ~0xf);
161 ehci->hcs_params = temp;
163 case PCI_VENDOR_ID_NVIDIA:
164 /* NF4: should be PCC=10 */
169 /* Serial Bus Release Number is at PCI 0x60 offset */
170 pci_read_config_byte(pdev, 0x60, &ehci->sbrn);
172 /* Workaround current PCI init glitch: wakeup bits aren't
173 * being set from PCI PM capability.
175 if (!device_can_wakeup(&pdev->dev)) {
178 pci_read_config_word(pdev, 0x62, &port_wake);
179 if (port_wake & 0x0001)
180 device_init_wakeup(&pdev->dev, 1);
183 #ifdef CONFIG_USB_SUSPEND
184 /* REVISIT: the controller works fine for wakeup iff the root hub
185 * itself is "globally" suspended, but usbcore currently doesn't
186 * understand such things.
188 * System suspend currently expects to be able to suspend the entire
189 * device tree, device-at-a-time. If we failed selective suspend
190 * reports, system suspend would fail; so the root hub code must claim
191 * success. That's lying to usbcore, and it matters for for runtime
192 * PM scenarios with selective suspend and remote wakeup...
194 if (ehci->no_selective_suspend && device_can_wakeup(&pdev->dev))
195 ehci_warn(ehci, "selective suspend/wakeup unavailable\n");
198 retval = ehci_pci_reinit(ehci, pdev);
203 /*-------------------------------------------------------------------------*/
207 /* suspend/resume, section 4.3 */
209 /* These routines rely on the PCI bus glue
210 * to handle powerdown and wakeup, and currently also on
211 * transceivers that don't need any software attention to set up
212 * the right sort of wakeup.
213 * Also they depend on separate root hub suspend/resume.
216 static int ehci_pci_suspend(struct usb_hcd *hcd, pm_message_t message)
218 struct ehci_hcd *ehci = hcd_to_ehci(hcd);
222 if (time_before(jiffies, ehci->next_statechange))
225 /* Root hub was already suspended. Disable irq emission and
226 * mark HW unaccessible, bail out if RH has been resumed. Use
227 * the spinlock to properly synchronize with possible pending
228 * RH suspend or resume activity.
230 * This is still racy as hcd->state is manipulated outside of
231 * any locks =P But that will be a different fix.
233 spin_lock_irqsave (&ehci->lock, flags);
234 if (hcd->state != HC_STATE_SUSPENDED) {
238 writel (0, &ehci->regs->intr_enable);
239 (void)readl(&ehci->regs->intr_enable);
241 /* make sure snapshot being resumed re-enumerates everything */
242 if (message.event == PM_EVENT_PRETHAW) {
247 clear_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags);
249 spin_unlock_irqrestore (&ehci->lock, flags);
251 // could save FLADJ in case of Vaux power loss
252 // ... we'd only use it to handle clock skew
257 static int ehci_pci_resume(struct usb_hcd *hcd)
259 struct ehci_hcd *ehci = hcd_to_ehci(hcd);
260 struct pci_dev *pdev = to_pci_dev(hcd->self.controller);
262 // maybe restore FLADJ
264 if (time_before(jiffies, ehci->next_statechange))
267 /* Mark hardware accessible again as we are out of D3 state by now */
268 set_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags);
270 /* If CF is still set, we maintained PCI Vaux power.
271 * Just undo the effect of ehci_pci_suspend().
273 if (readl(&ehci->regs->configured_flag) == FLAG_CF) {
274 int mask = INTR_MASK;
276 if (!device_may_wakeup(&hcd->self.root_hub->dev))
278 writel(mask, &ehci->regs->intr_enable);
279 readl(&ehci->regs->intr_enable);
283 ehci_dbg(ehci, "lost power, restarting\n");
284 usb_root_hub_lost_power(hcd->self.root_hub);
286 /* Else reset, to cope with power loss or flush-to-storage
287 * style "resume" having let BIOS kick in during reboot.
289 (void) ehci_halt(ehci);
290 (void) ehci_reset(ehci);
291 (void) ehci_pci_reinit(ehci, pdev);
293 /* emptying the schedule aborts any urbs */
294 spin_lock_irq(&ehci->lock);
296 ehci->reclaim_ready = 1;
298 spin_unlock_irq(&ehci->lock);
300 /* here we "know" root ports should always stay powered */
301 ehci_port_power(ehci, 1);
303 writel(ehci->command, &ehci->regs->command);
304 writel(FLAG_CF, &ehci->regs->configured_flag);
305 readl(&ehci->regs->command); /* unblock posted writes */
307 hcd->state = HC_STATE_SUSPENDED;
312 static const struct hc_driver ehci_pci_hc_driver = {
313 .description = hcd_name,
314 .product_desc = "EHCI Host Controller",
315 .hcd_priv_size = sizeof(struct ehci_hcd),
318 * generic hardware linkage
321 .flags = HCD_MEMORY | HCD_USB2,
324 * basic lifecycle operations
326 .reset = ehci_pci_setup,
329 .suspend = ehci_pci_suspend,
330 .resume = ehci_pci_resume,
333 .shutdown = ehci_shutdown,
336 * managing i/o requests and associated device resources
338 .urb_enqueue = ehci_urb_enqueue,
339 .urb_dequeue = ehci_urb_dequeue,
340 .endpoint_disable = ehci_endpoint_disable,
345 .get_frame_number = ehci_get_frame,
350 .hub_status_data = ehci_hub_status_data,
351 .hub_control = ehci_hub_control,
352 .bus_suspend = ehci_bus_suspend,
353 .bus_resume = ehci_bus_resume,
356 /*-------------------------------------------------------------------------*/
358 /* PCI driver selection metadata; PCI hotplugging uses this */
359 static const struct pci_device_id pci_ids [] = { {
360 /* handle any USB 2.0 EHCI controller */
361 PCI_DEVICE_CLASS(PCI_CLASS_SERIAL_USB_EHCI, ~0),
362 .driver_data = (unsigned long) &ehci_pci_hc_driver,
364 { /* end: all zeroes */ }
366 MODULE_DEVICE_TABLE(pci, pci_ids);
368 /* pci driver glue; this is a "new style" PCI driver module */
369 static struct pci_driver ehci_pci_driver = {
370 .name = (char *) hcd_name,
373 .probe = usb_hcd_pci_probe,
374 .remove = usb_hcd_pci_remove,
377 .suspend = usb_hcd_pci_suspend,
378 .resume = usb_hcd_pci_resume,
380 .shutdown = usb_hcd_pci_shutdown,