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 /* cache this readonly data; minimize chip reads */
80 ehci->hcs_params = readl(&ehci->caps->hcs_params);
82 retval = ehci_halt(ehci);
86 /* data structure init */
87 retval = ehci_init(hcd);
91 /* NOTE: only the parts below this line are PCI-specific */
93 switch (pdev->vendor) {
94 case PCI_VENDOR_ID_TDI:
95 if (pdev->device == PCI_DEVICE_ID_TDI_EHCI) {
96 ehci->is_tdi_rh_tt = 1;
100 case PCI_VENDOR_ID_AMD:
101 /* AMD8111 EHCI doesn't work, according to AMD errata */
102 if (pdev->device == 0x7463) {
103 ehci_info(ehci, "ignoring AMD8111 (errata)\n");
108 case PCI_VENDOR_ID_NVIDIA:
109 switch (pdev->device) {
110 /* NVidia reports that certain chips don't handle
111 * QH, ITD, or SITD addresses above 2GB. (But TD,
112 * data buffer, and periodic schedule are normal.)
114 case 0x003c: /* MCP04 */
115 case 0x005b: /* CK804 */
116 case 0x00d8: /* CK8 */
117 case 0x00e8: /* CK8S */
118 if (pci_set_consistent_dma_mask(pdev,
120 ehci_warn(ehci, "can't enable NVidia "
121 "workaround for >2GB RAM\n");
123 /* Some NForce2 chips have problems with selective suspend;
124 * fixed in newer silicon.
127 pci_read_config_dword(pdev, PCI_REVISION_ID, &temp);
128 if ((temp & 0xff) < 0xa4)
129 ehci->no_selective_suspend = 1;
135 if (ehci_is_TDI(ehci))
138 /* at least the Genesys GL880S needs fixup here */
139 temp = HCS_N_CC(ehci->hcs_params) * HCS_N_PCC(ehci->hcs_params);
141 if (temp && HCS_N_PORTS(ehci->hcs_params) > temp) {
142 ehci_dbg(ehci, "bogus port configuration: "
143 "cc=%d x pcc=%d < ports=%d\n",
144 HCS_N_CC(ehci->hcs_params),
145 HCS_N_PCC(ehci->hcs_params),
146 HCS_N_PORTS(ehci->hcs_params));
148 switch (pdev->vendor) {
149 case 0x17a0: /* GENESYS */
150 /* GL880S: should be PORTS=2 */
151 temp |= (ehci->hcs_params & ~0xf);
152 ehci->hcs_params = temp;
154 case PCI_VENDOR_ID_NVIDIA:
155 /* NF4: should be PCC=10 */
160 /* Serial Bus Release Number is at PCI 0x60 offset */
161 pci_read_config_byte(pdev, 0x60, &ehci->sbrn);
163 /* Workaround current PCI init glitch: wakeup bits aren't
164 * being set from PCI PM capability.
166 if (!device_can_wakeup(&pdev->dev)) {
169 pci_read_config_word(pdev, 0x62, &port_wake);
170 if (port_wake & 0x0001)
171 device_init_wakeup(&pdev->dev, 1);
174 #ifdef CONFIG_USB_SUSPEND
175 /* REVISIT: the controller works fine for wakeup iff the root hub
176 * itself is "globally" suspended, but usbcore currently doesn't
177 * understand such things.
179 * System suspend currently expects to be able to suspend the entire
180 * device tree, device-at-a-time. If we failed selective suspend
181 * reports, system suspend would fail; so the root hub code must claim
182 * success. That's lying to usbcore, and it matters for for runtime
183 * PM scenarios with selective suspend and remote wakeup...
185 if (ehci->no_selective_suspend && device_can_wakeup(&pdev->dev))
186 ehci_warn(ehci, "selective suspend/wakeup unavailable\n");
189 retval = ehci_pci_reinit(ehci, pdev);
194 /*-------------------------------------------------------------------------*/
198 /* suspend/resume, section 4.3 */
200 /* These routines rely on the PCI bus glue
201 * to handle powerdown and wakeup, and currently also on
202 * transceivers that don't need any software attention to set up
203 * the right sort of wakeup.
204 * Also they depend on separate root hub suspend/resume.
207 static int ehci_pci_suspend(struct usb_hcd *hcd, pm_message_t message)
209 struct ehci_hcd *ehci = hcd_to_ehci(hcd);
213 if (time_before(jiffies, ehci->next_statechange))
216 /* Root hub was already suspended. Disable irq emission and
217 * mark HW unaccessible, bail out if RH has been resumed. Use
218 * the spinlock to properly synchronize with possible pending
219 * RH suspend or resume activity.
221 * This is still racy as hcd->state is manipulated outside of
222 * any locks =P But that will be a different fix.
224 spin_lock_irqsave (&ehci->lock, flags);
225 if (hcd->state != HC_STATE_SUSPENDED) {
229 writel (0, &ehci->regs->intr_enable);
230 (void)readl(&ehci->regs->intr_enable);
232 clear_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags);
234 spin_unlock_irqrestore (&ehci->lock, flags);
236 // could save FLADJ in case of Vaux power loss
237 // ... we'd only use it to handle clock skew
242 static int ehci_pci_resume(struct usb_hcd *hcd)
244 struct ehci_hcd *ehci = hcd_to_ehci(hcd);
246 struct pci_dev *pdev = to_pci_dev(hcd->self.controller);
247 int retval = -EINVAL;
249 // maybe restore FLADJ
251 if (time_before(jiffies, ehci->next_statechange))
254 /* Mark hardware accessible again as we are out of D3 state by now */
255 set_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags);
257 /* If CF is clear, we lost PCI Vaux power and need to restart. */
258 if (readl(&ehci->regs->configured_flag) != FLAG_CF)
261 /* If any port is suspended (or owned by the companion),
262 * we know we can/must resume the HC (and mustn't reset it).
263 * We just defer that to the root hub code.
265 for (port = HCS_N_PORTS(ehci->hcs_params); port > 0; ) {
268 status = readl(&ehci->regs->port_status [port]);
269 if (!(status & PORT_POWER))
271 if (status & (PORT_SUSPEND | PORT_RESUME | PORT_OWNER)) {
272 usb_hcd_resume_root_hub(hcd);
278 ehci_dbg(ehci, "lost power, restarting\n");
279 usb_root_hub_lost_power(hcd->self.root_hub);
281 /* Else reset, to cope with power loss or flush-to-storage
282 * style "resume" having let BIOS kick in during reboot.
284 (void) ehci_halt(ehci);
285 (void) ehci_reset(ehci);
286 (void) ehci_pci_reinit(ehci, pdev);
288 /* emptying the schedule aborts any urbs */
289 spin_lock_irq(&ehci->lock);
291 ehci->reclaim_ready = 1;
292 ehci_work(ehci, NULL);
293 spin_unlock_irq(&ehci->lock);
295 /* restart; khubd will disconnect devices */
296 retval = ehci_run(hcd);
298 /* here we "know" root ports should always stay powered */
299 ehci_port_power(ehci, 1);
305 static const struct hc_driver ehci_pci_hc_driver = {
306 .description = hcd_name,
307 .product_desc = "EHCI Host Controller",
308 .hcd_priv_size = sizeof(struct ehci_hcd),
311 * generic hardware linkage
314 .flags = HCD_MEMORY | HCD_USB2,
317 * basic lifecycle operations
319 .reset = ehci_pci_setup,
322 .suspend = ehci_pci_suspend,
323 .resume = ehci_pci_resume,
328 * managing i/o requests and associated device resources
330 .urb_enqueue = ehci_urb_enqueue,
331 .urb_dequeue = ehci_urb_dequeue,
332 .endpoint_disable = ehci_endpoint_disable,
337 .get_frame_number = ehci_get_frame,
342 .hub_status_data = ehci_hub_status_data,
343 .hub_control = ehci_hub_control,
344 .bus_suspend = ehci_bus_suspend,
345 .bus_resume = ehci_bus_resume,
348 /*-------------------------------------------------------------------------*/
350 /* PCI driver selection metadata; PCI hotplugging uses this */
351 static const struct pci_device_id pci_ids [] = { {
352 /* handle any USB 2.0 EHCI controller */
353 PCI_DEVICE_CLASS(((PCI_CLASS_SERIAL_USB << 8) | 0x20), ~0),
354 .driver_data = (unsigned long) &ehci_pci_hc_driver,
356 { /* end: all zeroes */ }
358 MODULE_DEVICE_TABLE(pci, pci_ids);
360 /* pci driver glue; this is a "new style" PCI driver module */
361 static struct pci_driver ehci_pci_driver = {
362 .name = (char *) hcd_name,
365 .probe = usb_hcd_pci_probe,
366 .remove = usb_hcd_pci_remove,
369 .suspend = usb_hcd_pci_suspend,
370 .resume = usb_hcd_pci_resume,
374 static int __init ehci_hcd_pci_init(void)
379 pr_debug("%s: block sizes: qh %Zd qtd %Zd itd %Zd sitd %Zd\n",
381 sizeof(struct ehci_qh), sizeof(struct ehci_qtd),
382 sizeof(struct ehci_itd), sizeof(struct ehci_sitd));
384 return pci_register_driver(&ehci_pci_driver);
386 module_init(ehci_hcd_pci_init);
388 static void __exit ehci_hcd_pci_cleanup(void)
390 pci_unregister_driver(&ehci_pci_driver);
392 module_exit(ehci_hcd_pci_cleanup);