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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/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
45 static 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
51 static inline int is_ohci_or_uhci(struct pci_dev *pdev)
52 {
53         return pdev->class == CL_OHCI || pdev->class == CL_UHCI;
54 }
55
56 typedef 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 */
60 static 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)
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  */
90 static 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  */
107 static 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  */
128 static 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. */
139 static 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. */
149 static 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  */
177 int 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
286         if (pci_dev_run_wake(dev))
287                 pm_runtime_put_noidle(&dev->dev);
288         return retval;
289
290 unmap_registers:
291         if (driver->flags & HCD_MEMORY) {
292                 iounmap(hcd->regs);
293 release_mem_region:
294                 release_mem_region(hcd->rsrc_start, hcd->rsrc_len);
295         } else
296                 release_region(hcd->rsrc_start, hcd->rsrc_len);
297 put_hcd:
298         usb_put_hcd(hcd);
299 disable_pci:
300         pci_disable_device(dev);
301         dev_err(&dev->dev, "init %s fail, %d\n", pci_name(dev), retval);
302         return retval;
303 }
304 EXPORT_SYMBOL_GPL(usb_hcd_pci_probe);
305
306
307 /* may be called without controller electrically present */
308 /* may be called with controller, bus, and devices active */
309
310 /**
311  * usb_hcd_pci_remove - shutdown processing for PCI-based HCDs
312  * @dev: USB Host Controller being removed
313  * Context: !in_interrupt()
314  *
315  * Reverses the effect of usb_hcd_pci_probe(), first invoking
316  * the HCD's stop() method.  It is always called from a thread
317  * context, normally "rmmod", "apmd", or something similar.
318  *
319  * Store this function in the HCD's struct pci_driver as remove().
320  */
321 void usb_hcd_pci_remove(struct pci_dev *dev)
322 {
323         struct usb_hcd          *hcd;
324
325         hcd = pci_get_drvdata(dev);
326         if (!hcd)
327                 return;
328
329         if (pci_dev_run_wake(dev))
330                 pm_runtime_get_noresume(&dev->dev);
331
332         /* Fake an interrupt request in order to give the driver a chance
333          * to test whether the controller hardware has been removed (e.g.,
334          * cardbus physical eject).
335          */
336         local_irq_disable();
337         usb_hcd_irq(0, hcd);
338         local_irq_enable();
339
340         /* Note: dev_set_drvdata must be called while holding the rwsem */
341         if (dev->class == CL_EHCI) {
342                 down_write(&companions_rwsem);
343                 for_each_companion(dev, hcd, ehci_remove);
344                 usb_remove_hcd(hcd);
345                 dev_set_drvdata(&dev->dev, NULL);
346                 up_write(&companions_rwsem);
347         } else {
348                 /* Not EHCI; just clear the companion pointer */
349                 down_read(&companions_rwsem);
350                 hcd->self.hs_companion = NULL;
351                 usb_remove_hcd(hcd);
352                 dev_set_drvdata(&dev->dev, NULL);
353                 up_read(&companions_rwsem);
354         }
355
356         if (hcd->driver->flags & HCD_MEMORY) {
357                 iounmap(hcd->regs);
358                 release_mem_region(hcd->rsrc_start, hcd->rsrc_len);
359         } else {
360                 release_region(hcd->rsrc_start, hcd->rsrc_len);
361         }
362
363         usb_put_hcd(hcd);
364         pci_disable_device(dev);
365 }
366 EXPORT_SYMBOL_GPL(usb_hcd_pci_remove);
367
368 /**
369  * usb_hcd_pci_shutdown - shutdown host controller
370  * @dev: USB Host Controller being shutdown
371  */
372 void usb_hcd_pci_shutdown(struct pci_dev *dev)
373 {
374         struct usb_hcd          *hcd;
375
376         hcd = pci_get_drvdata(dev);
377         if (!hcd)
378                 return;
379
380         if (test_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags) &&
381                         hcd->driver->shutdown) {
382                 hcd->driver->shutdown(hcd);
383                 pci_disable_device(dev);
384         }
385 }
386 EXPORT_SYMBOL_GPL(usb_hcd_pci_shutdown);
387
388 #ifdef  CONFIG_PM
389
390 #ifdef  CONFIG_PPC_PMAC
391 static void powermac_set_asic(struct pci_dev *pci_dev, int enable)
392 {
393         /* Enanble or disable ASIC clocks for USB */
394         if (machine_is(powermac)) {
395                 struct device_node      *of_node;
396
397                 of_node = pci_device_to_OF_node(pci_dev);
398                 if (of_node)
399                         pmac_call_feature(PMAC_FTR_USB_ENABLE,
400                                         of_node, 0, enable);
401         }
402 }
403
404 #else
405
406 static inline void powermac_set_asic(struct pci_dev *pci_dev, int enable)
407 {}
408
409 #endif  /* CONFIG_PPC_PMAC */
410
411 static int check_root_hub_suspended(struct device *dev)
412 {
413         struct pci_dev          *pci_dev = to_pci_dev(dev);
414         struct usb_hcd          *hcd = pci_get_drvdata(pci_dev);
415
416         if (HCD_RH_RUNNING(hcd)) {
417                 dev_warn(dev, "Root hub is not suspended\n");
418                 return -EBUSY;
419         }
420         if (hcd->shared_hcd) {
421                 hcd = hcd->shared_hcd;
422                 if (HCD_RH_RUNNING(hcd)) {
423                         dev_warn(dev, "Secondary root hub is not suspended\n");
424                         return -EBUSY;
425                 }
426         }
427         return 0;
428 }
429
430 #if defined(CONFIG_PM_SLEEP) || defined(CONFIG_PM_RUNTIME)
431 static int suspend_common(struct device *dev, bool do_wakeup)
432 {
433         struct pci_dev          *pci_dev = to_pci_dev(dev);
434         struct usb_hcd          *hcd = pci_get_drvdata(pci_dev);
435         int                     retval;
436
437         /* Root hub suspend should have stopped all downstream traffic,
438          * and all bus master traffic.  And done so for both the interface
439          * and the stub usb_device (which we check here).  But maybe it
440          * didn't; writing sysfs power/state files ignores such rules...
441          */
442         retval = check_root_hub_suspended(dev);
443         if (retval)
444                 return retval;
445
446         if (hcd->driver->pci_suspend && !HCD_DEAD(hcd)) {
447                 /* Optimization: Don't suspend if a root-hub wakeup is
448                  * pending and it would cause the HCD to wake up anyway.
449                  */
450                 if (do_wakeup && HCD_WAKEUP_PENDING(hcd))
451                         return -EBUSY;
452                 if (do_wakeup && hcd->shared_hcd &&
453                                 HCD_WAKEUP_PENDING(hcd->shared_hcd))
454                         return -EBUSY;
455                 retval = hcd->driver->pci_suspend(hcd, do_wakeup);
456                 suspend_report_result(hcd->driver->pci_suspend, retval);
457
458                 /* Check again in case wakeup raced with pci_suspend */
459                 if ((retval == 0 && do_wakeup && HCD_WAKEUP_PENDING(hcd)) ||
460                                 (retval == 0 && do_wakeup && hcd->shared_hcd &&
461                                  HCD_WAKEUP_PENDING(hcd->shared_hcd))) {
462                         if (hcd->driver->pci_resume)
463                                 hcd->driver->pci_resume(hcd, false);
464                         retval = -EBUSY;
465                 }
466                 if (retval)
467                         return retval;
468         }
469
470         /* If MSI-X is enabled, the driver will have synchronized all vectors
471          * in pci_suspend(). If MSI or legacy PCI is enabled, that will be
472          * synchronized here.
473          */
474         if (!hcd->msix_enabled)
475                 synchronize_irq(pci_dev->irq);
476
477         /* Downstream ports from this root hub should already be quiesced, so
478          * there will be no DMA activity.  Now we can shut down the upstream
479          * link (except maybe for PME# resume signaling).  We'll enter a
480          * low power state during suspend_noirq, if the hardware allows.
481          */
482         pci_disable_device(pci_dev);
483         return retval;
484 }
485
486 static int resume_common(struct device *dev, int event)
487 {
488         struct pci_dev          *pci_dev = to_pci_dev(dev);
489         struct usb_hcd          *hcd = pci_get_drvdata(pci_dev);
490         int                     retval;
491
492         if (HCD_RH_RUNNING(hcd) ||
493                         (hcd->shared_hcd &&
494                          HCD_RH_RUNNING(hcd->shared_hcd))) {
495                 dev_dbg(dev, "can't resume, not suspended!\n");
496                 return 0;
497         }
498
499         retval = pci_enable_device(pci_dev);
500         if (retval < 0) {
501                 dev_err(dev, "can't re-enable after resume, %d!\n", retval);
502                 return retval;
503         }
504
505         pci_set_master(pci_dev);
506
507         if (hcd->driver->pci_resume && !HCD_DEAD(hcd)) {
508
509                 /*
510                  * Only EHCI controllers have to wait for their companions.
511                  * No locking is needed because PCI controller drivers do not
512                  * get unbound during system resume.
513                  */
514                 if (pci_dev->class == CL_EHCI && event != PM_EVENT_AUTO_RESUME)
515                         for_each_companion(pci_dev, hcd,
516                                         ehci_wait_for_companions);
517
518                 retval = hcd->driver->pci_resume(hcd,
519                                 event == PM_EVENT_RESTORE);
520                 if (retval) {
521                         dev_err(dev, "PCI post-resume error %d!\n", retval);
522                         if (hcd->shared_hcd)
523                                 usb_hc_died(hcd->shared_hcd);
524                         usb_hc_died(hcd);
525                 }
526         }
527         return retval;
528 }
529 #endif  /* SLEEP || RUNTIME */
530
531 #ifdef  CONFIG_PM_SLEEP
532
533 static int hcd_pci_suspend(struct device *dev)
534 {
535         return suspend_common(dev, device_may_wakeup(dev));
536 }
537
538 static int hcd_pci_suspend_noirq(struct device *dev)
539 {
540         struct pci_dev          *pci_dev = to_pci_dev(dev);
541         struct usb_hcd          *hcd = pci_get_drvdata(pci_dev);
542         int                     retval;
543
544         retval = check_root_hub_suspended(dev);
545         if (retval)
546                 return retval;
547
548         pci_save_state(pci_dev);
549
550         /* If the root hub is dead rather than suspended, disallow remote
551          * wakeup.  usb_hc_died() should ensure that both hosts are marked as
552          * dying, so we only need to check the primary roothub.
553          */
554         if (HCD_DEAD(hcd))
555                 device_set_wakeup_enable(dev, 0);
556         dev_dbg(dev, "wakeup: %d\n", device_may_wakeup(dev));
557
558         /* Possibly enable remote wakeup,
559          * choose the appropriate low-power state, and go to that state.
560          */
561         retval = pci_prepare_to_sleep(pci_dev);
562         if (retval == -EIO) {           /* Low-power not supported */
563                 dev_dbg(dev, "--> PCI D0 legacy\n");
564                 retval = 0;
565         } else if (retval == 0) {
566                 dev_dbg(dev, "--> PCI %s\n",
567                                 pci_power_name(pci_dev->current_state));
568         } else {
569                 suspend_report_result(pci_prepare_to_sleep, retval);
570                 return retval;
571         }
572
573         powermac_set_asic(pci_dev, 0);
574         return retval;
575 }
576
577 static int hcd_pci_resume_noirq(struct device *dev)
578 {
579         struct pci_dev          *pci_dev = to_pci_dev(dev);
580
581         powermac_set_asic(pci_dev, 1);
582
583         /* Go back to D0 and disable remote wakeup */
584         pci_back_from_sleep(pci_dev);
585         return 0;
586 }
587
588 static int hcd_pci_resume(struct device *dev)
589 {
590         return resume_common(dev, PM_EVENT_RESUME);
591 }
592
593 static int hcd_pci_restore(struct device *dev)
594 {
595         return resume_common(dev, PM_EVENT_RESTORE);
596 }
597
598 #else
599
600 #define hcd_pci_suspend         NULL
601 #define hcd_pci_suspend_noirq   NULL
602 #define hcd_pci_resume_noirq    NULL
603 #define hcd_pci_resume          NULL
604 #define hcd_pci_restore         NULL
605
606 #endif  /* CONFIG_PM_SLEEP */
607
608 #ifdef  CONFIG_PM_RUNTIME
609
610 static int hcd_pci_runtime_suspend(struct device *dev)
611 {
612         int     retval;
613
614         retval = suspend_common(dev, true);
615         if (retval == 0)
616                 powermac_set_asic(to_pci_dev(dev), 0);
617         dev_dbg(dev, "hcd_pci_runtime_suspend: %d\n", retval);
618         return retval;
619 }
620
621 static int hcd_pci_runtime_resume(struct device *dev)
622 {
623         int     retval;
624
625         powermac_set_asic(to_pci_dev(dev), 1);
626         retval = resume_common(dev, PM_EVENT_AUTO_RESUME);
627         dev_dbg(dev, "hcd_pci_runtime_resume: %d\n", retval);
628         return retval;
629 }
630
631 #else
632
633 #define hcd_pci_runtime_suspend NULL
634 #define hcd_pci_runtime_resume  NULL
635
636 #endif  /* CONFIG_PM_RUNTIME */
637
638 const struct dev_pm_ops usb_hcd_pci_pm_ops = {
639         .suspend        = hcd_pci_suspend,
640         .suspend_noirq  = hcd_pci_suspend_noirq,
641         .resume_noirq   = hcd_pci_resume_noirq,
642         .resume         = hcd_pci_resume,
643         .freeze         = check_root_hub_suspended,
644         .freeze_noirq   = check_root_hub_suspended,
645         .thaw_noirq     = NULL,
646         .thaw           = NULL,
647         .poweroff       = hcd_pci_suspend,
648         .poweroff_noirq = hcd_pci_suspend_noirq,
649         .restore_noirq  = hcd_pci_resume_noirq,
650         .restore        = hcd_pci_restore,
651         .runtime_suspend = hcd_pci_runtime_suspend,
652         .runtime_resume = hcd_pci_runtime_resume,
653 };
654 EXPORT_SYMBOL_GPL(usb_hcd_pci_pm_ops);
655
656 #endif  /* CONFIG_PM */