2 * (C) Copyright David Brownell 2000-2002
4 * This program is free software; you can redistribute it and/or modify it
5 * under the terms of the GNU General Public License as published by the
6 * Free Software Foundation; either version 2 of the License, or (at your
7 * option) any later version.
9 * This program is distributed in the hope that it will be useful, but
10 * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
11 * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
14 * You should have received a copy of the GNU General Public License
15 * along with this program; if not, write to the Free Software Foundation,
16 * Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
19 #include <linux/kernel.h>
20 #include <linux/module.h>
21 #include <linux/pci.h>
22 #include <linux/pm_runtime.h>
23 #include <linux/usb.h>
24 #include <linux/usb/hcd.h>
29 #ifdef CONFIG_PPC_PMAC
30 #include <asm/machdep.h>
31 #include <asm/pmac_feature.h>
32 #include <asm/pci-bridge.h>
39 /* PCI-based HCs are common, but plenty of non-PCI HCs are used too */
41 #ifdef CONFIG_PM_SLEEP
43 /* Coordinate handoffs between EHCI and companion controllers
44 * during system resume
47 static DEFINE_MUTEX(companions_mutex);
49 #define CL_UHCI PCI_CLASS_SERIAL_USB_UHCI
50 #define CL_OHCI PCI_CLASS_SERIAL_USB_OHCI
51 #define CL_EHCI PCI_CLASS_SERIAL_USB_EHCI
53 enum companion_action {
54 SET_HS_COMPANION, CLEAR_HS_COMPANION, WAIT_FOR_COMPANIONS
57 static void companion_common(struct pci_dev *pdev, struct usb_hcd *hcd,
58 enum companion_action action)
60 struct pci_dev *companion;
61 struct usb_hcd *companion_hcd;
62 unsigned int slot = PCI_SLOT(pdev->devfn);
64 /* Iterate through other PCI functions in the same slot.
65 * If pdev is OHCI or UHCI then we are looking for EHCI, and
69 for_each_pci_dev(companion) {
70 if (companion->bus != pdev->bus ||
71 PCI_SLOT(companion->devfn) != slot)
74 companion_hcd = pci_get_drvdata(companion);
78 /* For SET_HS_COMPANION, store a pointer to the EHCI bus in
79 * the OHCI/UHCI companion bus structure.
80 * For CLEAR_HS_COMPANION, clear the pointer to the EHCI bus
81 * in the OHCI/UHCI companion bus structure.
82 * For WAIT_FOR_COMPANIONS, wait until the OHCI/UHCI
83 * companion controllers have fully resumed.
86 if ((pdev->class == CL_OHCI || pdev->class == CL_UHCI) &&
87 companion->class == CL_EHCI) {
88 /* action must be SET_HS_COMPANION */
89 dev_dbg(&companion->dev, "HS companion for %s\n",
90 dev_name(&pdev->dev));
91 hcd->self.hs_companion = &companion_hcd->self;
93 } else if (pdev->class == CL_EHCI &&
94 (companion->class == CL_OHCI ||
95 companion->class == CL_UHCI)) {
97 case SET_HS_COMPANION:
98 dev_dbg(&pdev->dev, "HS companion for %s\n",
99 dev_name(&companion->dev));
100 companion_hcd->self.hs_companion = &hcd->self;
102 case CLEAR_HS_COMPANION:
103 companion_hcd->self.hs_companion = NULL;
105 case WAIT_FOR_COMPANIONS:
106 device_pm_wait_for_dev(&pdev->dev,
114 static void set_hs_companion(struct pci_dev *pdev, struct usb_hcd *hcd)
116 mutex_lock(&companions_mutex);
117 dev_set_drvdata(&pdev->dev, hcd);
118 companion_common(pdev, hcd, SET_HS_COMPANION);
119 mutex_unlock(&companions_mutex);
122 static void clear_hs_companion(struct pci_dev *pdev, struct usb_hcd *hcd)
124 mutex_lock(&companions_mutex);
125 dev_set_drvdata(&pdev->dev, NULL);
127 /* If pdev is OHCI or UHCI, just clear its hs_companion pointer */
128 if (pdev->class == CL_OHCI || pdev->class == CL_UHCI)
129 hcd->self.hs_companion = NULL;
131 /* Otherwise search for companion buses and clear their pointers */
133 companion_common(pdev, hcd, CLEAR_HS_COMPANION);
134 mutex_unlock(&companions_mutex);
137 static void wait_for_companions(struct pci_dev *pdev, struct usb_hcd *hcd)
139 /* Only EHCI controllers need to wait.
140 * No locking is needed because a controller cannot be resumed
141 * while one of its companions is getting unbound.
143 if (pdev->class == CL_EHCI)
144 companion_common(pdev, hcd, WAIT_FOR_COMPANIONS);
147 #else /* !CONFIG_PM_SLEEP */
149 static inline void set_hs_companion(struct pci_dev *d, struct usb_hcd *h) {}
150 static inline void clear_hs_companion(struct pci_dev *d, struct usb_hcd *h) {}
151 static inline void wait_for_companions(struct pci_dev *d, struct usb_hcd *h) {}
153 #endif /* !CONFIG_PM_SLEEP */
155 /*-------------------------------------------------------------------------*/
157 /* configure so an HC device and id are always provided */
158 /* always called with process context; sleeping is OK */
161 * usb_hcd_pci_probe - initialize PCI-based HCDs
162 * @dev: USB Host Controller being probed
163 * @id: pci hotplug id connecting controller to HCD framework
164 * Context: !in_interrupt()
166 * Allocates basic PCI resources for this USB host controller, and
167 * then invokes the start() method for the HCD associated with it
168 * through the hotplug entry's driver_data.
170 * Store this function in the HCD's struct pci_driver as probe().
172 int usb_hcd_pci_probe(struct pci_dev *dev, const struct pci_device_id *id)
174 struct hc_driver *driver;
183 driver = (struct hc_driver *)id->driver_data;
187 if (pci_enable_device(dev) < 0)
189 dev->current_state = PCI_D0;
193 "Found HC with no IRQ. Check BIOS/PCI %s setup!\n",
199 hcd = usb_create_hcd(driver, &dev->dev, pci_name(dev));
205 if (driver->flags & HCD_MEMORY) {
207 hcd->rsrc_start = pci_resource_start(dev, 0);
208 hcd->rsrc_len = pci_resource_len(dev, 0);
209 if (!request_mem_region(hcd->rsrc_start, hcd->rsrc_len,
210 driver->description)) {
211 dev_dbg(&dev->dev, "controller already in use\n");
215 hcd->regs = ioremap_nocache(hcd->rsrc_start, hcd->rsrc_len);
216 if (hcd->regs == NULL) {
217 dev_dbg(&dev->dev, "error mapping memory\n");
226 for (region = 0; region < PCI_ROM_RESOURCE; region++) {
227 if (!(pci_resource_flags(dev, region) &
231 hcd->rsrc_start = pci_resource_start(dev, region);
232 hcd->rsrc_len = pci_resource_len(dev, region);
233 if (request_region(hcd->rsrc_start, hcd->rsrc_len,
234 driver->description))
237 if (region == PCI_ROM_RESOURCE) {
238 dev_dbg(&dev->dev, "no i/o regions available\n");
246 retval = usb_add_hcd(hcd, dev->irq, IRQF_DISABLED | IRQF_SHARED);
249 set_hs_companion(dev, hcd);
251 if (pci_dev_run_wake(dev))
252 pm_runtime_put_noidle(&dev->dev);
256 if (driver->flags & HCD_MEMORY) {
259 release_mem_region(hcd->rsrc_start, hcd->rsrc_len);
261 release_region(hcd->rsrc_start, hcd->rsrc_len);
263 clear_hs_companion(dev, hcd);
266 pci_disable_device(dev);
267 dev_err(&dev->dev, "init %s fail, %d\n", pci_name(dev), retval);
270 EXPORT_SYMBOL_GPL(usb_hcd_pci_probe);
273 /* may be called without controller electrically present */
274 /* may be called with controller, bus, and devices active */
277 * usb_hcd_pci_remove - shutdown processing for PCI-based HCDs
278 * @dev: USB Host Controller being removed
279 * Context: !in_interrupt()
281 * Reverses the effect of usb_hcd_pci_probe(), first invoking
282 * the HCD's stop() method. It is always called from a thread
283 * context, normally "rmmod", "apmd", or something similar.
285 * Store this function in the HCD's struct pci_driver as remove().
287 void usb_hcd_pci_remove(struct pci_dev *dev)
291 hcd = pci_get_drvdata(dev);
295 if (pci_dev_run_wake(dev))
296 pm_runtime_get_noresume(&dev->dev);
298 /* Fake an interrupt request in order to give the driver a chance
299 * to test whether the controller hardware has been removed (e.g.,
300 * cardbus physical eject).
307 if (hcd->driver->flags & HCD_MEMORY) {
309 release_mem_region(hcd->rsrc_start, hcd->rsrc_len);
311 release_region(hcd->rsrc_start, hcd->rsrc_len);
313 clear_hs_companion(dev, hcd);
315 pci_disable_device(dev);
317 EXPORT_SYMBOL_GPL(usb_hcd_pci_remove);
320 * usb_hcd_pci_shutdown - shutdown host controller
321 * @dev: USB Host Controller being shutdown
323 void usb_hcd_pci_shutdown(struct pci_dev *dev)
327 hcd = pci_get_drvdata(dev);
331 if (test_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags) &&
332 hcd->driver->shutdown) {
333 hcd->driver->shutdown(hcd);
334 pci_disable_device(dev);
337 EXPORT_SYMBOL_GPL(usb_hcd_pci_shutdown);
341 #ifdef CONFIG_PPC_PMAC
342 static void powermac_set_asic(struct pci_dev *pci_dev, int enable)
344 /* Enanble or disable ASIC clocks for USB */
345 if (machine_is(powermac)) {
346 struct device_node *of_node;
348 of_node = pci_device_to_OF_node(pci_dev);
350 pmac_call_feature(PMAC_FTR_USB_ENABLE,
357 static inline void powermac_set_asic(struct pci_dev *pci_dev, int enable)
360 #endif /* CONFIG_PPC_PMAC */
362 static int check_root_hub_suspended(struct device *dev)
364 struct pci_dev *pci_dev = to_pci_dev(dev);
365 struct usb_hcd *hcd = pci_get_drvdata(pci_dev);
367 if (!(hcd->state == HC_STATE_SUSPENDED ||
368 hcd->state == HC_STATE_HALT)) {
369 dev_warn(dev, "Root hub is not suspended\n");
375 static int suspend_common(struct device *dev, bool do_wakeup)
377 struct pci_dev *pci_dev = to_pci_dev(dev);
378 struct usb_hcd *hcd = pci_get_drvdata(pci_dev);
381 /* Root hub suspend should have stopped all downstream traffic,
382 * and all bus master traffic. And done so for both the interface
383 * and the stub usb_device (which we check here). But maybe it
384 * didn't; writing sysfs power/state files ignores such rules...
386 retval = check_root_hub_suspended(dev);
390 if (hcd->driver->pci_suspend) {
391 /* Optimization: Don't suspend if a root-hub wakeup is
392 * pending and it would cause the HCD to wake up anyway.
394 if (do_wakeup && HCD_WAKEUP_PENDING(hcd))
396 retval = hcd->driver->pci_suspend(hcd, do_wakeup);
397 suspend_report_result(hcd->driver->pci_suspend, retval);
399 /* Check again in case wakeup raced with pci_suspend */
400 if (retval == 0 && do_wakeup && HCD_WAKEUP_PENDING(hcd)) {
401 if (hcd->driver->pci_resume)
402 hcd->driver->pci_resume(hcd, false);
409 synchronize_irq(pci_dev->irq);
411 /* Downstream ports from this root hub should already be quiesced, so
412 * there will be no DMA activity. Now we can shut down the upstream
413 * link (except maybe for PME# resume signaling). We'll enter a
414 * low power state during suspend_noirq, if the hardware allows.
416 pci_disable_device(pci_dev);
420 static int resume_common(struct device *dev, int event)
422 struct pci_dev *pci_dev = to_pci_dev(dev);
423 struct usb_hcd *hcd = pci_get_drvdata(pci_dev);
426 if (hcd->state != HC_STATE_SUSPENDED) {
427 dev_dbg(dev, "can't resume, not suspended!\n");
431 retval = pci_enable_device(pci_dev);
433 dev_err(dev, "can't re-enable after resume, %d!\n", retval);
437 pci_set_master(pci_dev);
439 clear_bit(HCD_FLAG_SAW_IRQ, &hcd->flags);
441 if (hcd->driver->pci_resume) {
442 if (event != PM_EVENT_AUTO_RESUME)
443 wait_for_companions(pci_dev, hcd);
445 retval = hcd->driver->pci_resume(hcd,
446 event == PM_EVENT_RESTORE);
448 dev_err(dev, "PCI post-resume error %d!\n", retval);
455 #ifdef CONFIG_PM_SLEEP
457 static int hcd_pci_suspend(struct device *dev)
459 return suspend_common(dev, device_may_wakeup(dev));
462 static int hcd_pci_suspend_noirq(struct device *dev)
464 struct pci_dev *pci_dev = to_pci_dev(dev);
465 struct usb_hcd *hcd = pci_get_drvdata(pci_dev);
468 retval = check_root_hub_suspended(dev);
472 pci_save_state(pci_dev);
474 /* If the root hub is HALTed rather than SUSPENDed,
475 * disallow remote wakeup.
477 if (hcd->state == HC_STATE_HALT)
478 device_set_wakeup_enable(dev, 0);
479 dev_dbg(dev, "wakeup: %d\n", device_may_wakeup(dev));
481 /* Possibly enable remote wakeup,
482 * choose the appropriate low-power state, and go to that state.
484 retval = pci_prepare_to_sleep(pci_dev);
485 if (retval == -EIO) { /* Low-power not supported */
486 dev_dbg(dev, "--> PCI D0 legacy\n");
488 } else if (retval == 0) {
489 dev_dbg(dev, "--> PCI %s\n",
490 pci_power_name(pci_dev->current_state));
492 suspend_report_result(pci_prepare_to_sleep, retval);
496 powermac_set_asic(pci_dev, 0);
500 static int hcd_pci_resume_noirq(struct device *dev)
502 struct pci_dev *pci_dev = to_pci_dev(dev);
504 powermac_set_asic(pci_dev, 1);
506 /* Go back to D0 and disable remote wakeup */
507 pci_back_from_sleep(pci_dev);
511 static int hcd_pci_resume(struct device *dev)
513 return resume_common(dev, PM_EVENT_RESUME);
516 static int hcd_pci_restore(struct device *dev)
518 return resume_common(dev, PM_EVENT_RESTORE);
523 #define hcd_pci_suspend NULL
524 #define hcd_pci_suspend_noirq NULL
525 #define hcd_pci_resume_noirq NULL
526 #define hcd_pci_resume NULL
527 #define hcd_pci_restore NULL
529 #endif /* CONFIG_PM_SLEEP */
531 #ifdef CONFIG_PM_RUNTIME
533 static int hcd_pci_runtime_suspend(struct device *dev)
537 retval = suspend_common(dev, true);
539 powermac_set_asic(to_pci_dev(dev), 0);
540 dev_dbg(dev, "hcd_pci_runtime_suspend: %d\n", retval);
544 static int hcd_pci_runtime_resume(struct device *dev)
548 powermac_set_asic(to_pci_dev(dev), 1);
549 retval = resume_common(dev, PM_EVENT_AUTO_RESUME);
550 dev_dbg(dev, "hcd_pci_runtime_resume: %d\n", retval);
556 #define hcd_pci_runtime_suspend NULL
557 #define hcd_pci_runtime_resume NULL
559 #endif /* CONFIG_PM_RUNTIME */
561 const struct dev_pm_ops usb_hcd_pci_pm_ops = {
562 .suspend = hcd_pci_suspend,
563 .suspend_noirq = hcd_pci_suspend_noirq,
564 .resume_noirq = hcd_pci_resume_noirq,
565 .resume = hcd_pci_resume,
566 .freeze = check_root_hub_suspended,
567 .freeze_noirq = check_root_hub_suspended,
570 .poweroff = hcd_pci_suspend,
571 .poweroff_noirq = hcd_pci_suspend_noirq,
572 .restore_noirq = hcd_pci_resume_noirq,
573 .restore = hcd_pci_restore,
574 .runtime_suspend = hcd_pci_runtime_suspend,
575 .runtime_resume = hcd_pci_runtime_resume,
577 EXPORT_SYMBOL_GPL(usb_hcd_pci_pm_ops);
579 #endif /* CONFIG_PM_OPS */