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1/*
2 * (C) Copyright David Brownell 2000-2002
3 *
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.
8 *
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
12 * for more details.
13 *
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.
17 */
18
19#include <linux/kernel.h>
20#include <linux/module.h>
21#include <linux/pci.h>
22#include <linux/usb.h>
23#include <linux/usb/hcd.h>
24
25#include <asm/io.h>
26#include <asm/irq.h>
27
28#ifdef CONFIG_PPC_PMAC
29#include <asm/machdep.h>
30#include <asm/pmac_feature.h>
31#include <asm/prom.h>
32#endif
33
34#include "usb.h"
35
36
37/* PCI-based HCs are common, but plenty of non-PCI HCs are used too */
38
39/*
40 * Coordinate handoffs between EHCI and companion controllers
41 * during EHCI probing and system resume.
42 */
43
44static DECLARE_RWSEM(companions_rwsem);
45
46#define CL_UHCI PCI_CLASS_SERIAL_USB_UHCI
47#define CL_OHCI PCI_CLASS_SERIAL_USB_OHCI
48#define CL_EHCI PCI_CLASS_SERIAL_USB_EHCI
49
50static inline int is_ohci_or_uhci(struct pci_dev *pdev)
51{
52 return pdev->class == CL_OHCI || pdev->class == CL_UHCI;
53}
54
55typedef void (*companion_fn)(struct pci_dev *pdev, struct usb_hcd *hcd,
56 struct pci_dev *companion, struct usb_hcd *companion_hcd);
57
58/* Iterate over PCI devices in the same slot as pdev and call fn for each */
59static void for_each_companion(struct pci_dev *pdev, struct usb_hcd *hcd,
60 companion_fn fn)
61{
62 struct pci_dev *companion;
63 struct usb_hcd *companion_hcd;
64 unsigned int slot = PCI_SLOT(pdev->devfn);
65
66 /*
67 * Iterate through other PCI functions in the same slot.
68 * If the function's drvdata isn't set then it isn't bound to
69 * a USB host controller driver, so skip it.
70 */
71 companion = NULL;
72 for_each_pci_dev(companion) {
73 if (companion->bus != pdev->bus ||
74 PCI_SLOT(companion->devfn) != slot)
75 continue;
76
77 /*
78 * Companion device should be either UHCI,OHCI or EHCI host
79 * controller, otherwise skip.
80 */
81 if (companion->class != CL_UHCI && companion->class != CL_OHCI &&
82 companion->class != CL_EHCI)
83 continue;
84
85 companion_hcd = pci_get_drvdata(companion);
86 if (!companion_hcd || !companion_hcd->self.root_hub)
87 continue;
88 fn(pdev, hcd, companion, companion_hcd);
89 }
90}
91
92/*
93 * We're about to add an EHCI controller, which will unceremoniously grab
94 * all the port connections away from its companions. To prevent annoying
95 * error messages, lock the companion's root hub and gracefully unconfigure
96 * it beforehand. Leave it locked until the EHCI controller is all set.
97 */
98static void ehci_pre_add(struct pci_dev *pdev, struct usb_hcd *hcd,
99 struct pci_dev *companion, struct usb_hcd *companion_hcd)
100{
101 struct usb_device *udev;
102
103 if (is_ohci_or_uhci(companion)) {
104 udev = companion_hcd->self.root_hub;
105 usb_lock_device(udev);
106 usb_set_configuration(udev, 0);
107 }
108}
109
110/*
111 * Adding the EHCI controller has either succeeded or failed. Set the
112 * companion pointer accordingly, and in either case, reconfigure and
113 * unlock the root hub.
114 */
115static void ehci_post_add(struct pci_dev *pdev, struct usb_hcd *hcd,
116 struct pci_dev *companion, struct usb_hcd *companion_hcd)
117{
118 struct usb_device *udev;
119
120 if (is_ohci_or_uhci(companion)) {
121 if (dev_get_drvdata(&pdev->dev)) { /* Succeeded */
122 dev_dbg(&pdev->dev, "HS companion for %s\n",
123 dev_name(&companion->dev));
124 companion_hcd->self.hs_companion = &hcd->self;
125 }
126 udev = companion_hcd->self.root_hub;
127 usb_set_configuration(udev, 1);
128 usb_unlock_device(udev);
129 }
130}
131
132/*
133 * We just added a non-EHCI controller. Find the EHCI controller to
134 * which it is a companion, and store a pointer to the bus structure.
135 */
136static void non_ehci_add(struct pci_dev *pdev, struct usb_hcd *hcd,
137 struct pci_dev *companion, struct usb_hcd *companion_hcd)
138{
139 if (is_ohci_or_uhci(pdev) && companion->class == CL_EHCI) {
140 dev_dbg(&pdev->dev, "FS/LS companion for %s\n",
141 dev_name(&companion->dev));
142 hcd->self.hs_companion = &companion_hcd->self;
143 }
144}
145
146/* We are removing an EHCI controller. Clear the companions' pointers. */
147static void ehci_remove(struct pci_dev *pdev, struct usb_hcd *hcd,
148 struct pci_dev *companion, struct usb_hcd *companion_hcd)
149{
150 if (is_ohci_or_uhci(companion))
151 companion_hcd->self.hs_companion = NULL;
152}
153
154#ifdef CONFIG_PM
155
156/* An EHCI controller must wait for its companions before resuming. */
157static void ehci_wait_for_companions(struct pci_dev *pdev, struct usb_hcd *hcd,
158 struct pci_dev *companion, struct usb_hcd *companion_hcd)
159{
160 if (is_ohci_or_uhci(companion))
161 device_pm_wait_for_dev(&pdev->dev, &companion->dev);
162}
163
164#endif /* CONFIG_PM */
165
166/*-------------------------------------------------------------------------*/
167
168/* configure so an HC device and id are always provided */
169/* always called with process context; sleeping is OK */
170
171/**
172 * usb_hcd_pci_probe - initialize PCI-based HCDs
173 * @dev: USB Host Controller being probed
174 * @id: pci hotplug id connecting controller to HCD framework
175 * Context: !in_interrupt()
176 *
177 * Allocates basic PCI resources for this USB host controller, and
178 * then invokes the start() method for the HCD associated with it
179 * through the hotplug entry's driver_data.
180 *
181 * Store this function in the HCD's struct pci_driver as probe().
182 *
183 * Return: 0 if successful.
184 */
185int usb_hcd_pci_probe(struct pci_dev *dev, const struct pci_device_id *id)
186{
187 struct hc_driver *driver;
188 struct usb_hcd *hcd;
189 int retval;
190 int hcd_irq = 0;
191
192 if (usb_disabled())
193 return -ENODEV;
194
195 if (!id)
196 return -EINVAL;
197 driver = (struct hc_driver *)id->driver_data;
198 if (!driver)
199 return -EINVAL;
200
201 if (pci_enable_device(dev) < 0)
202 return -ENODEV;
203
204 /*
205 * The xHCI driver has its own irq management
206 * make sure irq setup is not touched for xhci in generic hcd code
207 */
208 if ((driver->flags & HCD_MASK) < HCD_USB3) {
209 if (!dev->irq) {
210 dev_err(&dev->dev,
211 "Found HC with no IRQ. Check BIOS/PCI %s setup!\n",
212 pci_name(dev));
213 retval = -ENODEV;
214 goto disable_pci;
215 }
216 hcd_irq = dev->irq;
217 }
218
219 hcd = usb_create_hcd(driver, &dev->dev, pci_name(dev));
220 if (!hcd) {
221 retval = -ENOMEM;
222 goto disable_pci;
223 }
224
225 hcd->amd_resume_bug = (usb_hcd_amd_remote_wakeup_quirk(dev) &&
226 driver->flags & (HCD_USB11 | HCD_USB3)) ? 1 : 0;
227
228 if (driver->flags & HCD_MEMORY) {
229 /* EHCI, OHCI */
230 hcd->rsrc_start = pci_resource_start(dev, 0);
231 hcd->rsrc_len = pci_resource_len(dev, 0);
232 if (!request_mem_region(hcd->rsrc_start, hcd->rsrc_len,
233 driver->description)) {
234 dev_dbg(&dev->dev, "controller already in use\n");
235 retval = -EBUSY;
236 goto put_hcd;
237 }
238 hcd->regs = ioremap_nocache(hcd->rsrc_start, hcd->rsrc_len);
239 if (hcd->regs == NULL) {
240 dev_dbg(&dev->dev, "error mapping memory\n");
241 retval = -EFAULT;
242 goto release_mem_region;
243 }
244
245 } else {
246 /* UHCI */
247 int region;
248
249 for (region = 0; region < PCI_ROM_RESOURCE; region++) {
250 if (!(pci_resource_flags(dev, region) &
251 IORESOURCE_IO))
252 continue;
253
254 hcd->rsrc_start = pci_resource_start(dev, region);
255 hcd->rsrc_len = pci_resource_len(dev, region);
256 if (request_region(hcd->rsrc_start, hcd->rsrc_len,
257 driver->description))
258 break;
259 }
260 if (region == PCI_ROM_RESOURCE) {
261 dev_dbg(&dev->dev, "no i/o regions available\n");
262 retval = -EBUSY;
263 goto put_hcd;
264 }
265 }
266
267 pci_set_master(dev);
268
269 /* Note: dev_set_drvdata must be called while holding the rwsem */
270 if (dev->class == CL_EHCI) {
271 down_write(&companions_rwsem);
272 dev_set_drvdata(&dev->dev, hcd);
273 for_each_companion(dev, hcd, ehci_pre_add);
274 retval = usb_add_hcd(hcd, hcd_irq, IRQF_SHARED);
275 if (retval != 0)
276 dev_set_drvdata(&dev->dev, NULL);
277 for_each_companion(dev, hcd, ehci_post_add);
278 up_write(&companions_rwsem);
279 } else {
280 down_read(&companions_rwsem);
281 dev_set_drvdata(&dev->dev, hcd);
282 retval = usb_add_hcd(hcd, hcd_irq, IRQF_SHARED);
283 if (retval != 0)
284 dev_set_drvdata(&dev->dev, NULL);
285 else
286 for_each_companion(dev, hcd, non_ehci_add);
287 up_read(&companions_rwsem);
288 }
289
290 if (retval != 0)
291 goto unmap_registers;
292 device_wakeup_enable(hcd->self.controller);
293
294 if (pci_dev_run_wake(dev))
295 pm_runtime_put_noidle(&dev->dev);
296 return retval;
297
298unmap_registers:
299 if (driver->flags & HCD_MEMORY) {
300 iounmap(hcd->regs);
301release_mem_region:
302 release_mem_region(hcd->rsrc_start, hcd->rsrc_len);
303 } else
304 release_region(hcd->rsrc_start, hcd->rsrc_len);
305put_hcd:
306 usb_put_hcd(hcd);
307disable_pci:
308 pci_disable_device(dev);
309 dev_err(&dev->dev, "init %s fail, %d\n", pci_name(dev), retval);
310 return retval;
311}
312EXPORT_SYMBOL_GPL(usb_hcd_pci_probe);
313
314
315/* may be called without controller electrically present */
316/* may be called with controller, bus, and devices active */
317
318/**
319 * usb_hcd_pci_remove - shutdown processing for PCI-based HCDs
320 * @dev: USB Host Controller being removed
321 * Context: !in_interrupt()
322 *
323 * Reverses the effect of usb_hcd_pci_probe(), first invoking
324 * the HCD's stop() method. It is always called from a thread
325 * context, normally "rmmod", "apmd", or something similar.
326 *
327 * Store this function in the HCD's struct pci_driver as remove().
328 */
329void usb_hcd_pci_remove(struct pci_dev *dev)
330{
331 struct usb_hcd *hcd;
332
333 hcd = pci_get_drvdata(dev);
334 if (!hcd)
335 return;
336
337 if (pci_dev_run_wake(dev))
338 pm_runtime_get_noresume(&dev->dev);
339
340 /* Fake an interrupt request in order to give the driver a chance
341 * to test whether the controller hardware has been removed (e.g.,
342 * cardbus physical eject).
343 */
344 local_irq_disable();
345 usb_hcd_irq(0, hcd);
346 local_irq_enable();
347
348 /* Note: dev_set_drvdata must be called while holding the rwsem */
349 if (dev->class == CL_EHCI) {
350 down_write(&companions_rwsem);
351 for_each_companion(dev, hcd, ehci_remove);
352 usb_remove_hcd(hcd);
353 dev_set_drvdata(&dev->dev, NULL);
354 up_write(&companions_rwsem);
355 } else {
356 /* Not EHCI; just clear the companion pointer */
357 down_read(&companions_rwsem);
358 hcd->self.hs_companion = NULL;
359 usb_remove_hcd(hcd);
360 dev_set_drvdata(&dev->dev, NULL);
361 up_read(&companions_rwsem);
362 }
363
364 if (hcd->driver->flags & HCD_MEMORY) {
365 iounmap(hcd->regs);
366 release_mem_region(hcd->rsrc_start, hcd->rsrc_len);
367 } else {
368 release_region(hcd->rsrc_start, hcd->rsrc_len);
369 }
370
371 usb_put_hcd(hcd);
372 pci_disable_device(dev);
373}
374EXPORT_SYMBOL_GPL(usb_hcd_pci_remove);
375
376/**
377 * usb_hcd_pci_shutdown - shutdown host controller
378 * @dev: USB Host Controller being shutdown
379 */
380void usb_hcd_pci_shutdown(struct pci_dev *dev)
381{
382 struct usb_hcd *hcd;
383
384 hcd = pci_get_drvdata(dev);
385 if (!hcd)
386 return;
387
388 if (test_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags) &&
389 hcd->driver->shutdown) {
390 hcd->driver->shutdown(hcd);
391 if (usb_hcd_is_primary_hcd(hcd) && hcd->irq > 0)
392 free_irq(hcd->irq, hcd);
393 pci_disable_device(dev);
394 }
395}
396EXPORT_SYMBOL_GPL(usb_hcd_pci_shutdown);
397
398#ifdef CONFIG_PM
399
400#ifdef CONFIG_PPC_PMAC
401static void powermac_set_asic(struct pci_dev *pci_dev, int enable)
402{
403 /* Enanble or disable ASIC clocks for USB */
404 if (machine_is(powermac)) {
405 struct device_node *of_node;
406
407 of_node = pci_device_to_OF_node(pci_dev);
408 if (of_node)
409 pmac_call_feature(PMAC_FTR_USB_ENABLE,
410 of_node, 0, enable);
411 }
412}
413
414#else
415
416static inline void powermac_set_asic(struct pci_dev *pci_dev, int enable)
417{}
418
419#endif /* CONFIG_PPC_PMAC */
420
421static int check_root_hub_suspended(struct device *dev)
422{
423 struct pci_dev *pci_dev = to_pci_dev(dev);
424 struct usb_hcd *hcd = pci_get_drvdata(pci_dev);
425
426 if (HCD_RH_RUNNING(hcd)) {
427 dev_warn(dev, "Root hub is not suspended\n");
428 return -EBUSY;
429 }
430 if (hcd->shared_hcd) {
431 hcd = hcd->shared_hcd;
432 if (HCD_RH_RUNNING(hcd)) {
433 dev_warn(dev, "Secondary root hub is not suspended\n");
434 return -EBUSY;
435 }
436 }
437 return 0;
438}
439
440static int suspend_common(struct device *dev, bool do_wakeup)
441{
442 struct pci_dev *pci_dev = to_pci_dev(dev);
443 struct usb_hcd *hcd = pci_get_drvdata(pci_dev);
444 int retval;
445
446 /* Root hub suspend should have stopped all downstream traffic,
447 * and all bus master traffic. And done so for both the interface
448 * and the stub usb_device (which we check here). But maybe it
449 * didn't; writing sysfs power/state files ignores such rules...
450 */
451 retval = check_root_hub_suspended(dev);
452 if (retval)
453 return retval;
454
455 if (hcd->driver->pci_suspend && !HCD_DEAD(hcd)) {
456 /* Optimization: Don't suspend if a root-hub wakeup is
457 * pending and it would cause the HCD to wake up anyway.
458 */
459 if (do_wakeup && HCD_WAKEUP_PENDING(hcd))
460 return -EBUSY;
461 if (do_wakeup && hcd->shared_hcd &&
462 HCD_WAKEUP_PENDING(hcd->shared_hcd))
463 return -EBUSY;
464 retval = hcd->driver->pci_suspend(hcd, do_wakeup);
465 suspend_report_result(hcd->driver->pci_suspend, retval);
466
467 /* Check again in case wakeup raced with pci_suspend */
468 if ((retval == 0 && do_wakeup && HCD_WAKEUP_PENDING(hcd)) ||
469 (retval == 0 && do_wakeup && hcd->shared_hcd &&
470 HCD_WAKEUP_PENDING(hcd->shared_hcd))) {
471 if (hcd->driver->pci_resume)
472 hcd->driver->pci_resume(hcd, false);
473 retval = -EBUSY;
474 }
475 if (retval)
476 return retval;
477 }
478
479 /* If MSI-X is enabled, the driver will have synchronized all vectors
480 * in pci_suspend(). If MSI or legacy PCI is enabled, that will be
481 * synchronized here.
482 */
483 if (!hcd->msix_enabled)
484 synchronize_irq(pci_dev->irq);
485
486 /* Downstream ports from this root hub should already be quiesced, so
487 * there will be no DMA activity. Now we can shut down the upstream
488 * link (except maybe for PME# resume signaling). We'll enter a
489 * low power state during suspend_noirq, if the hardware allows.
490 */
491 pci_disable_device(pci_dev);
492 return retval;
493}
494
495static int resume_common(struct device *dev, int event)
496{
497 struct pci_dev *pci_dev = to_pci_dev(dev);
498 struct usb_hcd *hcd = pci_get_drvdata(pci_dev);
499 int retval;
500
501 if (HCD_RH_RUNNING(hcd) ||
502 (hcd->shared_hcd &&
503 HCD_RH_RUNNING(hcd->shared_hcd))) {
504 dev_dbg(dev, "can't resume, not suspended!\n");
505 return 0;
506 }
507
508 retval = pci_enable_device(pci_dev);
509 if (retval < 0) {
510 dev_err(dev, "can't re-enable after resume, %d!\n", retval);
511 return retval;
512 }
513
514 pci_set_master(pci_dev);
515
516 if (hcd->driver->pci_resume && !HCD_DEAD(hcd)) {
517
518 /*
519 * Only EHCI controllers have to wait for their companions.
520 * No locking is needed because PCI controller drivers do not
521 * get unbound during system resume.
522 */
523 if (pci_dev->class == CL_EHCI && event != PM_EVENT_AUTO_RESUME)
524 for_each_companion(pci_dev, hcd,
525 ehci_wait_for_companions);
526
527 retval = hcd->driver->pci_resume(hcd,
528 event == PM_EVENT_RESTORE);
529 if (retval) {
530 dev_err(dev, "PCI post-resume error %d!\n", retval);
531 if (hcd->shared_hcd)
532 usb_hc_died(hcd->shared_hcd);
533 usb_hc_died(hcd);
534 }
535 }
536 return retval;
537}
538
539#ifdef CONFIG_PM_SLEEP
540
541static int hcd_pci_suspend(struct device *dev)
542{
543 return suspend_common(dev, device_may_wakeup(dev));
544}
545
546static int hcd_pci_suspend_noirq(struct device *dev)
547{
548 struct pci_dev *pci_dev = to_pci_dev(dev);
549 struct usb_hcd *hcd = pci_get_drvdata(pci_dev);
550 int retval;
551
552 retval = check_root_hub_suspended(dev);
553 if (retval)
554 return retval;
555
556 pci_save_state(pci_dev);
557
558 /* If the root hub is dead rather than suspended, disallow remote
559 * wakeup. usb_hc_died() should ensure that both hosts are marked as
560 * dying, so we only need to check the primary roothub.
561 */
562 if (HCD_DEAD(hcd))
563 device_set_wakeup_enable(dev, 0);
564 dev_dbg(dev, "wakeup: %d\n", device_may_wakeup(dev));
565
566 /* Possibly enable remote wakeup,
567 * choose the appropriate low-power state, and go to that state.
568 */
569 retval = pci_prepare_to_sleep(pci_dev);
570 if (retval == -EIO) { /* Low-power not supported */
571 dev_dbg(dev, "--> PCI D0 legacy\n");
572 retval = 0;
573 } else if (retval == 0) {
574 dev_dbg(dev, "--> PCI %s\n",
575 pci_power_name(pci_dev->current_state));
576 } else {
577 suspend_report_result(pci_prepare_to_sleep, retval);
578 return retval;
579 }
580
581 powermac_set_asic(pci_dev, 0);
582 return retval;
583}
584
585static int hcd_pci_resume_noirq(struct device *dev)
586{
587 struct pci_dev *pci_dev = to_pci_dev(dev);
588
589 powermac_set_asic(pci_dev, 1);
590
591 /* Go back to D0 and disable remote wakeup */
592 pci_back_from_sleep(pci_dev);
593 return 0;
594}
595
596static int hcd_pci_resume(struct device *dev)
597{
598 return resume_common(dev, PM_EVENT_RESUME);
599}
600
601static int hcd_pci_restore(struct device *dev)
602{
603 return resume_common(dev, PM_EVENT_RESTORE);
604}
605
606#else
607
608#define hcd_pci_suspend NULL
609#define hcd_pci_suspend_noirq NULL
610#define hcd_pci_resume_noirq NULL
611#define hcd_pci_resume NULL
612#define hcd_pci_restore NULL
613
614#endif /* CONFIG_PM_SLEEP */
615
616static int hcd_pci_runtime_suspend(struct device *dev)
617{
618 int retval;
619
620 retval = suspend_common(dev, true);
621 if (retval == 0)
622 powermac_set_asic(to_pci_dev(dev), 0);
623 dev_dbg(dev, "hcd_pci_runtime_suspend: %d\n", retval);
624 return retval;
625}
626
627static int hcd_pci_runtime_resume(struct device *dev)
628{
629 int retval;
630
631 powermac_set_asic(to_pci_dev(dev), 1);
632 retval = resume_common(dev, PM_EVENT_AUTO_RESUME);
633 dev_dbg(dev, "hcd_pci_runtime_resume: %d\n", retval);
634 return retval;
635}
636
637const struct dev_pm_ops usb_hcd_pci_pm_ops = {
638 .suspend = hcd_pci_suspend,
639 .suspend_noirq = hcd_pci_suspend_noirq,
640 .resume_noirq = hcd_pci_resume_noirq,
641 .resume = hcd_pci_resume,
642 .freeze = check_root_hub_suspended,
643 .freeze_noirq = check_root_hub_suspended,
644 .thaw_noirq = NULL,
645 .thaw = NULL,
646 .poweroff = hcd_pci_suspend,
647 .poweroff_noirq = hcd_pci_suspend_noirq,
648 .restore_noirq = hcd_pci_resume_noirq,
649 .restore = hcd_pci_restore,
650 .runtime_suspend = hcd_pci_runtime_suspend,
651 .runtime_resume = hcd_pci_runtime_resume,
652};
653EXPORT_SYMBOL_GPL(usb_hcd_pci_pm_ops);
654
655#endif /* CONFIG_PM */
1/*
2 * (C) Copyright David Brownell 2000-2002
3 *
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.
8 *
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
12 * for more details.
13 *
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.
17 */
18
19#include <linux/kernel.h>
20#include <linux/module.h>
21#include <linux/pci.h>
22#include <linux/usb.h>
23#include <linux/usb/hcd.h>
24
25#include <asm/io.h>
26#include <asm/irq.h>
27
28#ifdef CONFIG_PPC_PMAC
29#include <asm/machdep.h>
30#include <asm/pmac_feature.h>
31#include <asm/pci-bridge.h>
32#include <asm/prom.h>
33#endif
34
35#include "usb.h"
36
37
38/* PCI-based HCs are common, but plenty of non-PCI HCs are used too */
39
40/*
41 * Coordinate handoffs between EHCI and companion controllers
42 * during EHCI probing and system resume.
43 */
44
45static DECLARE_RWSEM(companions_rwsem);
46
47#define CL_UHCI PCI_CLASS_SERIAL_USB_UHCI
48#define CL_OHCI PCI_CLASS_SERIAL_USB_OHCI
49#define CL_EHCI PCI_CLASS_SERIAL_USB_EHCI
50
51static inline int is_ohci_or_uhci(struct pci_dev *pdev)
52{
53 return pdev->class == CL_OHCI || pdev->class == CL_UHCI;
54}
55
56typedef void (*companion_fn)(struct pci_dev *pdev, struct usb_hcd *hcd,
57 struct pci_dev *companion, struct usb_hcd *companion_hcd);
58
59/* Iterate over PCI devices in the same slot as pdev and call fn for each */
60static void for_each_companion(struct pci_dev *pdev, struct usb_hcd *hcd,
61 companion_fn fn)
62{
63 struct pci_dev *companion;
64 struct usb_hcd *companion_hcd;
65 unsigned int slot = PCI_SLOT(pdev->devfn);
66
67 /*
68 * Iterate through other PCI functions in the same slot.
69 * If the function's drvdata isn't set then it isn't bound to
70 * a USB host controller driver, so skip it.
71 */
72 companion = NULL;
73 for_each_pci_dev(companion) {
74 if (companion->bus != pdev->bus ||
75 PCI_SLOT(companion->devfn) != slot)
76 continue;
77 companion_hcd = pci_get_drvdata(companion);
78 if (!companion_hcd || !companion_hcd->self.root_hub)
79 continue;
80 fn(pdev, hcd, companion, companion_hcd);
81 }
82}
83
84/*
85 * We're about to add an EHCI controller, which will unceremoniously grab
86 * all the port connections away from its companions. To prevent annoying
87 * error messages, lock the companion's root hub and gracefully unconfigure
88 * it beforehand. Leave it locked until the EHCI controller is all set.
89 */
90static void ehci_pre_add(struct pci_dev *pdev, struct usb_hcd *hcd,
91 struct pci_dev *companion, struct usb_hcd *companion_hcd)
92{
93 struct usb_device *udev;
94
95 if (is_ohci_or_uhci(companion)) {
96 udev = companion_hcd->self.root_hub;
97 usb_lock_device(udev);
98 usb_set_configuration(udev, 0);
99 }
100}
101
102/*
103 * Adding the EHCI controller has either succeeded or failed. Set the
104 * companion pointer accordingly, and in either case, reconfigure and
105 * unlock the root hub.
106 */
107static void ehci_post_add(struct pci_dev *pdev, struct usb_hcd *hcd,
108 struct pci_dev *companion, struct usb_hcd *companion_hcd)
109{
110 struct usb_device *udev;
111
112 if (is_ohci_or_uhci(companion)) {
113 if (dev_get_drvdata(&pdev->dev)) { /* Succeeded */
114 dev_dbg(&pdev->dev, "HS companion for %s\n",
115 dev_name(&companion->dev));
116 companion_hcd->self.hs_companion = &hcd->self;
117 }
118 udev = companion_hcd->self.root_hub;
119 usb_set_configuration(udev, 1);
120 usb_unlock_device(udev);
121 }
122}
123
124/*
125 * We just added a non-EHCI controller. Find the EHCI controller to
126 * which it is a companion, and store a pointer to the bus structure.
127 */
128static void non_ehci_add(struct pci_dev *pdev, struct usb_hcd *hcd,
129 struct pci_dev *companion, struct usb_hcd *companion_hcd)
130{
131 if (is_ohci_or_uhci(pdev) && companion->class == CL_EHCI) {
132 dev_dbg(&pdev->dev, "FS/LS companion for %s\n",
133 dev_name(&companion->dev));
134 hcd->self.hs_companion = &companion_hcd->self;
135 }
136}
137
138/* We are removing an EHCI controller. Clear the companions' pointers. */
139static void ehci_remove(struct pci_dev *pdev, struct usb_hcd *hcd,
140 struct pci_dev *companion, struct usb_hcd *companion_hcd)
141{
142 if (is_ohci_or_uhci(companion))
143 companion_hcd->self.hs_companion = NULL;
144}
145
146#ifdef CONFIG_PM
147
148/* An EHCI controller must wait for its companions before resuming. */
149static void ehci_wait_for_companions(struct pci_dev *pdev, struct usb_hcd *hcd,
150 struct pci_dev *companion, struct usb_hcd *companion_hcd)
151{
152 if (is_ohci_or_uhci(companion))
153 device_pm_wait_for_dev(&pdev->dev, &companion->dev);
154}
155
156#endif /* CONFIG_PM */
157
158/*-------------------------------------------------------------------------*/
159
160/* configure so an HC device and id are always provided */
161/* always called with process context; sleeping is OK */
162
163/**
164 * usb_hcd_pci_probe - initialize PCI-based HCDs
165 * @dev: USB Host Controller being probed
166 * @id: pci hotplug id connecting controller to HCD framework
167 * Context: !in_interrupt()
168 *
169 * Allocates basic PCI resources for this USB host controller, and
170 * then invokes the start() method for the HCD associated with it
171 * through the hotplug entry's driver_data.
172 *
173 * Store this function in the HCD's struct pci_driver as probe().
174 *
175 * Return: 0 if successful.
176 */
177int usb_hcd_pci_probe(struct pci_dev *dev, const struct pci_device_id *id)
178{
179 struct hc_driver *driver;
180 struct usb_hcd *hcd;
181 int retval;
182 int hcd_irq = 0;
183
184 if (usb_disabled())
185 return -ENODEV;
186
187 if (!id)
188 return -EINVAL;
189 driver = (struct hc_driver *)id->driver_data;
190 if (!driver)
191 return -EINVAL;
192
193 if (pci_enable_device(dev) < 0)
194 return -ENODEV;
195 dev->current_state = PCI_D0;
196
197 /*
198 * The xHCI driver has its own irq management
199 * make sure irq setup is not touched for xhci in generic hcd code
200 */
201 if ((driver->flags & HCD_MASK) != HCD_USB3) {
202 if (!dev->irq) {
203 dev_err(&dev->dev,
204 "Found HC with no IRQ. Check BIOS/PCI %s setup!\n",
205 pci_name(dev));
206 retval = -ENODEV;
207 goto disable_pci;
208 }
209 hcd_irq = dev->irq;
210 }
211
212 hcd = usb_create_hcd(driver, &dev->dev, pci_name(dev));
213 if (!hcd) {
214 retval = -ENOMEM;
215 goto disable_pci;
216 }
217
218 hcd->amd_resume_bug = (usb_hcd_amd_remote_wakeup_quirk(dev) &&
219 driver->flags & (HCD_USB11 | HCD_USB3)) ? 1 : 0;
220
221 if (driver->flags & HCD_MEMORY) {
222 /* EHCI, OHCI */
223 hcd->rsrc_start = pci_resource_start(dev, 0);
224 hcd->rsrc_len = pci_resource_len(dev, 0);
225 if (!request_mem_region(hcd->rsrc_start, hcd->rsrc_len,
226 driver->description)) {
227 dev_dbg(&dev->dev, "controller already in use\n");
228 retval = -EBUSY;
229 goto put_hcd;
230 }
231 hcd->regs = ioremap_nocache(hcd->rsrc_start, hcd->rsrc_len);
232 if (hcd->regs == NULL) {
233 dev_dbg(&dev->dev, "error mapping memory\n");
234 retval = -EFAULT;
235 goto release_mem_region;
236 }
237
238 } else {
239 /* UHCI */
240 int region;
241
242 for (region = 0; region < PCI_ROM_RESOURCE; region++) {
243 if (!(pci_resource_flags(dev, region) &
244 IORESOURCE_IO))
245 continue;
246
247 hcd->rsrc_start = pci_resource_start(dev, region);
248 hcd->rsrc_len = pci_resource_len(dev, region);
249 if (request_region(hcd->rsrc_start, hcd->rsrc_len,
250 driver->description))
251 break;
252 }
253 if (region == PCI_ROM_RESOURCE) {
254 dev_dbg(&dev->dev, "no i/o regions available\n");
255 retval = -EBUSY;
256 goto put_hcd;
257 }
258 }
259
260 pci_set_master(dev);
261
262 /* Note: dev_set_drvdata must be called while holding the rwsem */
263 if (dev->class == CL_EHCI) {
264 down_write(&companions_rwsem);
265 dev_set_drvdata(&dev->dev, hcd);
266 for_each_companion(dev, hcd, ehci_pre_add);
267 retval = usb_add_hcd(hcd, hcd_irq, IRQF_SHARED);
268 if (retval != 0)
269 dev_set_drvdata(&dev->dev, NULL);
270 for_each_companion(dev, hcd, ehci_post_add);
271 up_write(&companions_rwsem);
272 } else {
273 down_read(&companions_rwsem);
274 dev_set_drvdata(&dev->dev, hcd);
275 retval = usb_add_hcd(hcd, hcd_irq, IRQF_SHARED);
276 if (retval != 0)
277 dev_set_drvdata(&dev->dev, NULL);
278 else
279 for_each_companion(dev, hcd, non_ehci_add);
280 up_read(&companions_rwsem);
281 }
282
283 if (retval != 0)
284 goto unmap_registers;
285 device_wakeup_enable(hcd->self.controller);
286
287 if (pci_dev_run_wake(dev))
288 pm_runtime_put_noidle(&dev->dev);
289 return retval;
290
291unmap_registers:
292 if (driver->flags & HCD_MEMORY) {
293 iounmap(hcd->regs);
294release_mem_region:
295 release_mem_region(hcd->rsrc_start, hcd->rsrc_len);
296 } else
297 release_region(hcd->rsrc_start, hcd->rsrc_len);
298put_hcd:
299 usb_put_hcd(hcd);
300disable_pci:
301 pci_disable_device(dev);
302 dev_err(&dev->dev, "init %s fail, %d\n", pci_name(dev), retval);
303 return retval;
304}
305EXPORT_SYMBOL_GPL(usb_hcd_pci_probe);
306
307
308/* may be called without controller electrically present */
309/* may be called with controller, bus, and devices active */
310
311/**
312 * usb_hcd_pci_remove - shutdown processing for PCI-based HCDs
313 * @dev: USB Host Controller being removed
314 * Context: !in_interrupt()
315 *
316 * Reverses the effect of usb_hcd_pci_probe(), first invoking
317 * the HCD's stop() method. It is always called from a thread
318 * context, normally "rmmod", "apmd", or something similar.
319 *
320 * Store this function in the HCD's struct pci_driver as remove().
321 */
322void usb_hcd_pci_remove(struct pci_dev *dev)
323{
324 struct usb_hcd *hcd;
325
326 hcd = pci_get_drvdata(dev);
327 if (!hcd)
328 return;
329
330 if (pci_dev_run_wake(dev))
331 pm_runtime_get_noresume(&dev->dev);
332
333 /* Fake an interrupt request in order to give the driver a chance
334 * to test whether the controller hardware has been removed (e.g.,
335 * cardbus physical eject).
336 */
337 local_irq_disable();
338 usb_hcd_irq(0, hcd);
339 local_irq_enable();
340
341 /* Note: dev_set_drvdata must be called while holding the rwsem */
342 if (dev->class == CL_EHCI) {
343 down_write(&companions_rwsem);
344 for_each_companion(dev, hcd, ehci_remove);
345 usb_remove_hcd(hcd);
346 dev_set_drvdata(&dev->dev, NULL);
347 up_write(&companions_rwsem);
348 } else {
349 /* Not EHCI; just clear the companion pointer */
350 down_read(&companions_rwsem);
351 hcd->self.hs_companion = NULL;
352 usb_remove_hcd(hcd);
353 dev_set_drvdata(&dev->dev, NULL);
354 up_read(&companions_rwsem);
355 }
356
357 if (hcd->driver->flags & HCD_MEMORY) {
358 iounmap(hcd->regs);
359 release_mem_region(hcd->rsrc_start, hcd->rsrc_len);
360 } else {
361 release_region(hcd->rsrc_start, hcd->rsrc_len);
362 }
363
364 usb_put_hcd(hcd);
365 pci_disable_device(dev);
366}
367EXPORT_SYMBOL_GPL(usb_hcd_pci_remove);
368
369/**
370 * usb_hcd_pci_shutdown - shutdown host controller
371 * @dev: USB Host Controller being shutdown
372 */
373void usb_hcd_pci_shutdown(struct pci_dev *dev)
374{
375 struct usb_hcd *hcd;
376
377 hcd = pci_get_drvdata(dev);
378 if (!hcd)
379 return;
380
381 if (test_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags) &&
382 hcd->driver->shutdown) {
383 hcd->driver->shutdown(hcd);
384 pci_disable_device(dev);
385 }
386}
387EXPORT_SYMBOL_GPL(usb_hcd_pci_shutdown);
388
389#ifdef CONFIG_PM
390
391#ifdef CONFIG_PPC_PMAC
392static void powermac_set_asic(struct pci_dev *pci_dev, int enable)
393{
394 /* Enanble or disable ASIC clocks for USB */
395 if (machine_is(powermac)) {
396 struct device_node *of_node;
397
398 of_node = pci_device_to_OF_node(pci_dev);
399 if (of_node)
400 pmac_call_feature(PMAC_FTR_USB_ENABLE,
401 of_node, 0, enable);
402 }
403}
404
405#else
406
407static inline void powermac_set_asic(struct pci_dev *pci_dev, int enable)
408{}
409
410#endif /* CONFIG_PPC_PMAC */
411
412static int check_root_hub_suspended(struct device *dev)
413{
414 struct pci_dev *pci_dev = to_pci_dev(dev);
415 struct usb_hcd *hcd = pci_get_drvdata(pci_dev);
416
417 if (HCD_RH_RUNNING(hcd)) {
418 dev_warn(dev, "Root hub is not suspended\n");
419 return -EBUSY;
420 }
421 if (hcd->shared_hcd) {
422 hcd = hcd->shared_hcd;
423 if (HCD_RH_RUNNING(hcd)) {
424 dev_warn(dev, "Secondary root hub is not suspended\n");
425 return -EBUSY;
426 }
427 }
428 return 0;
429}
430
431#if defined(CONFIG_PM_SLEEP) || defined(CONFIG_PM_RUNTIME)
432static int suspend_common(struct device *dev, bool do_wakeup)
433{
434 struct pci_dev *pci_dev = to_pci_dev(dev);
435 struct usb_hcd *hcd = pci_get_drvdata(pci_dev);
436 int retval;
437
438 /* Root hub suspend should have stopped all downstream traffic,
439 * and all bus master traffic. And done so for both the interface
440 * and the stub usb_device (which we check here). But maybe it
441 * didn't; writing sysfs power/state files ignores such rules...
442 */
443 retval = check_root_hub_suspended(dev);
444 if (retval)
445 return retval;
446
447 if (hcd->driver->pci_suspend && !HCD_DEAD(hcd)) {
448 /* Optimization: Don't suspend if a root-hub wakeup is
449 * pending and it would cause the HCD to wake up anyway.
450 */
451 if (do_wakeup && HCD_WAKEUP_PENDING(hcd))
452 return -EBUSY;
453 if (do_wakeup && hcd->shared_hcd &&
454 HCD_WAKEUP_PENDING(hcd->shared_hcd))
455 return -EBUSY;
456 retval = hcd->driver->pci_suspend(hcd, do_wakeup);
457 suspend_report_result(hcd->driver->pci_suspend, retval);
458
459 /* Check again in case wakeup raced with pci_suspend */
460 if ((retval == 0 && do_wakeup && HCD_WAKEUP_PENDING(hcd)) ||
461 (retval == 0 && do_wakeup && hcd->shared_hcd &&
462 HCD_WAKEUP_PENDING(hcd->shared_hcd))) {
463 if (hcd->driver->pci_resume)
464 hcd->driver->pci_resume(hcd, false);
465 retval = -EBUSY;
466 }
467 if (retval)
468 return retval;
469 }
470
471 /* If MSI-X is enabled, the driver will have synchronized all vectors
472 * in pci_suspend(). If MSI or legacy PCI is enabled, that will be
473 * synchronized here.
474 */
475 if (!hcd->msix_enabled)
476 synchronize_irq(pci_dev->irq);
477
478 /* Downstream ports from this root hub should already be quiesced, so
479 * there will be no DMA activity. Now we can shut down the upstream
480 * link (except maybe for PME# resume signaling). We'll enter a
481 * low power state during suspend_noirq, if the hardware allows.
482 */
483 pci_disable_device(pci_dev);
484 return retval;
485}
486
487static int resume_common(struct device *dev, int event)
488{
489 struct pci_dev *pci_dev = to_pci_dev(dev);
490 struct usb_hcd *hcd = pci_get_drvdata(pci_dev);
491 int retval;
492
493 if (HCD_RH_RUNNING(hcd) ||
494 (hcd->shared_hcd &&
495 HCD_RH_RUNNING(hcd->shared_hcd))) {
496 dev_dbg(dev, "can't resume, not suspended!\n");
497 return 0;
498 }
499
500 retval = pci_enable_device(pci_dev);
501 if (retval < 0) {
502 dev_err(dev, "can't re-enable after resume, %d!\n", retval);
503 return retval;
504 }
505
506 pci_set_master(pci_dev);
507
508 if (hcd->driver->pci_resume && !HCD_DEAD(hcd)) {
509
510 /*
511 * Only EHCI controllers have to wait for their companions.
512 * No locking is needed because PCI controller drivers do not
513 * get unbound during system resume.
514 */
515 if (pci_dev->class == CL_EHCI && event != PM_EVENT_AUTO_RESUME)
516 for_each_companion(pci_dev, hcd,
517 ehci_wait_for_companions);
518
519 retval = hcd->driver->pci_resume(hcd,
520 event == PM_EVENT_RESTORE);
521 if (retval) {
522 dev_err(dev, "PCI post-resume error %d!\n", retval);
523 if (hcd->shared_hcd)
524 usb_hc_died(hcd->shared_hcd);
525 usb_hc_died(hcd);
526 }
527 }
528 return retval;
529}
530#endif /* SLEEP || RUNTIME */
531
532#ifdef CONFIG_PM_SLEEP
533
534static int hcd_pci_suspend(struct device *dev)
535{
536 return suspend_common(dev, device_may_wakeup(dev));
537}
538
539static int hcd_pci_suspend_noirq(struct device *dev)
540{
541 struct pci_dev *pci_dev = to_pci_dev(dev);
542 struct usb_hcd *hcd = pci_get_drvdata(pci_dev);
543 int retval;
544
545 retval = check_root_hub_suspended(dev);
546 if (retval)
547 return retval;
548
549 pci_save_state(pci_dev);
550
551 /* If the root hub is dead rather than suspended, disallow remote
552 * wakeup. usb_hc_died() should ensure that both hosts are marked as
553 * dying, so we only need to check the primary roothub.
554 */
555 if (HCD_DEAD(hcd))
556 device_set_wakeup_enable(dev, 0);
557 dev_dbg(dev, "wakeup: %d\n", device_may_wakeup(dev));
558
559 /* Possibly enable remote wakeup,
560 * choose the appropriate low-power state, and go to that state.
561 */
562 retval = pci_prepare_to_sleep(pci_dev);
563 if (retval == -EIO) { /* Low-power not supported */
564 dev_dbg(dev, "--> PCI D0 legacy\n");
565 retval = 0;
566 } else if (retval == 0) {
567 dev_dbg(dev, "--> PCI %s\n",
568 pci_power_name(pci_dev->current_state));
569 } else {
570 suspend_report_result(pci_prepare_to_sleep, retval);
571 return retval;
572 }
573
574 powermac_set_asic(pci_dev, 0);
575 return retval;
576}
577
578static int hcd_pci_resume_noirq(struct device *dev)
579{
580 struct pci_dev *pci_dev = to_pci_dev(dev);
581
582 powermac_set_asic(pci_dev, 1);
583
584 /* Go back to D0 and disable remote wakeup */
585 pci_back_from_sleep(pci_dev);
586 return 0;
587}
588
589static int hcd_pci_resume(struct device *dev)
590{
591 return resume_common(dev, PM_EVENT_RESUME);
592}
593
594static int hcd_pci_restore(struct device *dev)
595{
596 return resume_common(dev, PM_EVENT_RESTORE);
597}
598
599#else
600
601#define hcd_pci_suspend NULL
602#define hcd_pci_suspend_noirq NULL
603#define hcd_pci_resume_noirq NULL
604#define hcd_pci_resume NULL
605#define hcd_pci_restore NULL
606
607#endif /* CONFIG_PM_SLEEP */
608
609#ifdef CONFIG_PM_RUNTIME
610
611static int hcd_pci_runtime_suspend(struct device *dev)
612{
613 int retval;
614
615 retval = suspend_common(dev, true);
616 if (retval == 0)
617 powermac_set_asic(to_pci_dev(dev), 0);
618 dev_dbg(dev, "hcd_pci_runtime_suspend: %d\n", retval);
619 return retval;
620}
621
622static int hcd_pci_runtime_resume(struct device *dev)
623{
624 int retval;
625
626 powermac_set_asic(to_pci_dev(dev), 1);
627 retval = resume_common(dev, PM_EVENT_AUTO_RESUME);
628 dev_dbg(dev, "hcd_pci_runtime_resume: %d\n", retval);
629 return retval;
630}
631
632#else
633
634#define hcd_pci_runtime_suspend NULL
635#define hcd_pci_runtime_resume NULL
636
637#endif /* CONFIG_PM_RUNTIME */
638
639const struct dev_pm_ops usb_hcd_pci_pm_ops = {
640 .suspend = hcd_pci_suspend,
641 .suspend_noirq = hcd_pci_suspend_noirq,
642 .resume_noirq = hcd_pci_resume_noirq,
643 .resume = hcd_pci_resume,
644 .freeze = check_root_hub_suspended,
645 .freeze_noirq = check_root_hub_suspended,
646 .thaw_noirq = NULL,
647 .thaw = NULL,
648 .poweroff = hcd_pci_suspend,
649 .poweroff_noirq = hcd_pci_suspend_noirq,
650 .restore_noirq = hcd_pci_resume_noirq,
651 .restore = hcd_pci_restore,
652 .runtime_suspend = hcd_pci_runtime_suspend,
653 .runtime_resume = hcd_pci_runtime_resume,
654};
655EXPORT_SYMBOL_GPL(usb_hcd_pci_pm_ops);
656
657#endif /* CONFIG_PM */