]> www.pilppa.org Git - linux-2.6-omap-h63xx.git/blob - drivers/usb/core/hcd-pci.c
USB: don't enable wakeup by default for PCI host controllers
[linux-2.6-omap-h63xx.git] / drivers / usb / core / hcd-pci.c
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
24 #include <asm/io.h>
25 #include <asm/irq.h>
26
27 #ifdef CONFIG_PPC_PMAC
28 #include <asm/machdep.h>
29 #include <asm/pmac_feature.h>
30 #include <asm/pci-bridge.h>
31 #include <asm/prom.h>
32 #endif
33
34 #include "usb.h"
35 #include "hcd.h"
36
37
38 /* PCI-based HCs are common, but plenty of non-PCI HCs are used too */
39
40
41 /*-------------------------------------------------------------------------*/
42
43 /* configure so an HC device and id are always provided */
44 /* always called with process context; sleeping is OK */
45
46 /**
47  * usb_hcd_pci_probe - initialize PCI-based HCDs
48  * @dev: USB Host Controller being probed
49  * @id: pci hotplug id connecting controller to HCD framework
50  * Context: !in_interrupt()
51  *
52  * Allocates basic PCI resources for this USB host controller, and
53  * then invokes the start() method for the HCD associated with it
54  * through the hotplug entry's driver_data.
55  *
56  * Store this function in the HCD's struct pci_driver as probe().
57  */
58 int usb_hcd_pci_probe(struct pci_dev *dev, const struct pci_device_id *id)
59 {
60         struct hc_driver        *driver;
61         struct usb_hcd          *hcd;
62         int                     retval;
63
64         if (usb_disabled())
65                 return -ENODEV;
66
67         if (!id)
68                 return -EINVAL;
69         driver = (struct hc_driver *)id->driver_data;
70         if (!driver)
71                 return -EINVAL;
72
73         if (pci_enable_device(dev) < 0)
74                 return -ENODEV;
75         dev->current_state = PCI_D0;
76
77         if (!dev->irq) {
78                 dev_err(&dev->dev,
79                         "Found HC with no IRQ.  Check BIOS/PCI %s setup!\n",
80                         pci_name(dev));
81                 retval = -ENODEV;
82                 goto err1;
83         }
84
85         hcd = usb_create_hcd(driver, &dev->dev, pci_name(dev));
86         if (!hcd) {
87                 retval = -ENOMEM;
88                 goto err1;
89         }
90
91         if (driver->flags & HCD_MEMORY) {
92                 /* EHCI, OHCI */
93                 hcd->rsrc_start = pci_resource_start(dev, 0);
94                 hcd->rsrc_len = pci_resource_len(dev, 0);
95                 if (!request_mem_region(hcd->rsrc_start, hcd->rsrc_len,
96                                 driver->description)) {
97                         dev_dbg(&dev->dev, "controller already in use\n");
98                         retval = -EBUSY;
99                         goto err2;
100                 }
101                 hcd->regs = ioremap_nocache(hcd->rsrc_start, hcd->rsrc_len);
102                 if (hcd->regs == NULL) {
103                         dev_dbg(&dev->dev, "error mapping memory\n");
104                         retval = -EFAULT;
105                         goto err3;
106                 }
107
108         } else {
109                 /* UHCI */
110                 int     region;
111
112                 for (region = 0; region < PCI_ROM_RESOURCE; region++) {
113                         if (!(pci_resource_flags(dev, region) &
114                                         IORESOURCE_IO))
115                                 continue;
116
117                         hcd->rsrc_start = pci_resource_start(dev, region);
118                         hcd->rsrc_len = pci_resource_len(dev, region);
119                         if (request_region(hcd->rsrc_start, hcd->rsrc_len,
120                                         driver->description))
121                                 break;
122                 }
123                 if (region == PCI_ROM_RESOURCE) {
124                         dev_dbg(&dev->dev, "no i/o regions available\n");
125                         retval = -EBUSY;
126                         goto err1;
127                 }
128         }
129
130         pci_set_master(dev);
131
132         retval = usb_add_hcd(hcd, dev->irq, IRQF_DISABLED | IRQF_SHARED);
133         if (retval != 0)
134                 goto err4;
135         return retval;
136
137  err4:
138         if (driver->flags & HCD_MEMORY) {
139                 iounmap(hcd->regs);
140  err3:
141                 release_mem_region(hcd->rsrc_start, hcd->rsrc_len);
142         } else
143                 release_region(hcd->rsrc_start, hcd->rsrc_len);
144  err2:
145         usb_put_hcd(hcd);
146  err1:
147         pci_disable_device(dev);
148         dev_err(&dev->dev, "init %s fail, %d\n", pci_name(dev), retval);
149         return retval;
150 }
151 EXPORT_SYMBOL_GPL(usb_hcd_pci_probe);
152
153
154 /* may be called without controller electrically present */
155 /* may be called with controller, bus, and devices active */
156
157 /**
158  * usb_hcd_pci_remove - shutdown processing for PCI-based HCDs
159  * @dev: USB Host Controller being removed
160  * Context: !in_interrupt()
161  *
162  * Reverses the effect of usb_hcd_pci_probe(), first invoking
163  * the HCD's stop() method.  It is always called from a thread
164  * context, normally "rmmod", "apmd", or something similar.
165  *
166  * Store this function in the HCD's struct pci_driver as remove().
167  */
168 void usb_hcd_pci_remove(struct pci_dev *dev)
169 {
170         struct usb_hcd          *hcd;
171
172         hcd = pci_get_drvdata(dev);
173         if (!hcd)
174                 return;
175
176         usb_remove_hcd(hcd);
177         if (hcd->driver->flags & HCD_MEMORY) {
178                 iounmap(hcd->regs);
179                 release_mem_region(hcd->rsrc_start, hcd->rsrc_len);
180         } else {
181                 release_region(hcd->rsrc_start, hcd->rsrc_len);
182         }
183         usb_put_hcd(hcd);
184         pci_disable_device(dev);
185 }
186 EXPORT_SYMBOL_GPL(usb_hcd_pci_remove);
187
188
189 #ifdef  CONFIG_PM
190
191 /**
192  * usb_hcd_pci_suspend - power management suspend of a PCI-based HCD
193  * @dev: USB Host Controller being suspended
194  * @message: Power Management message describing this state transition
195  *
196  * Store this function in the HCD's struct pci_driver as .suspend.
197  */
198 int usb_hcd_pci_suspend(struct pci_dev *dev, pm_message_t message)
199 {
200         struct usb_hcd          *hcd = pci_get_drvdata(dev);
201         int                     retval = 0;
202         int                     wake, w;
203
204         /* Root hub suspend should have stopped all downstream traffic,
205          * and all bus master traffic.  And done so for both the interface
206          * and the stub usb_device (which we check here).  But maybe it
207          * didn't; writing sysfs power/state files ignores such rules...
208          *
209          * We must ignore the FREEZE vs SUSPEND distinction here, because
210          * otherwise the swsusp will save (and restore) garbage state.
211          */
212         if (!(hcd->state == HC_STATE_SUSPENDED ||
213                         hcd->state == HC_STATE_HALT)) {
214                 dev_warn(&dev->dev, "Root hub is not suspended\n");
215                 retval = -EBUSY;
216                 goto done;
217         }
218
219         /* We might already be suspended (runtime PM -- not yet written) */
220         if (dev->current_state != PCI_D0)
221                 goto done;
222
223         if (hcd->driver->pci_suspend) {
224                 retval = hcd->driver->pci_suspend(hcd, message);
225                 suspend_report_result(hcd->driver->pci_suspend, retval);
226                 if (retval)
227                         goto done;
228         }
229
230         synchronize_irq(dev->irq);
231
232         /* Don't fail on error to enable wakeup.  We rely on pci code
233          * to reject requests the hardware can't implement, rather
234          * than coding the same thing.
235          */
236         wake = (hcd->state == HC_STATE_SUSPENDED &&
237                         device_may_wakeup(&dev->dev));
238         w = pci_wake_from_d3(dev, wake);
239         if (w < 0)
240                 wake = w;
241         dev_dbg(&dev->dev, "wakeup: %d\n", wake);
242
243         /* Downstream ports from this root hub should already be quiesced, so
244          * there will be no DMA activity.  Now we can shut down the upstream
245          * link (except maybe for PME# resume signaling) and enter some PCI
246          * low power state, if the hardware allows.
247          */
248         pci_disable_device(dev);
249  done:
250         return retval;
251 }
252 EXPORT_SYMBOL_GPL(usb_hcd_pci_suspend);
253
254 /**
255  * usb_hcd_pci_suspend_late - suspend a PCI-based HCD after IRQs are disabled
256  * @dev: USB Host Controller being suspended
257  * @message: Power Management message describing this state transition
258  *
259  * Store this function in the HCD's struct pci_driver as .suspend_late.
260  */
261 int usb_hcd_pci_suspend_late(struct pci_dev *dev, pm_message_t message)
262 {
263         int                     retval = 0;
264         int                     has_pci_pm;
265
266         /* We might already be suspended (runtime PM -- not yet written) */
267         if (dev->current_state != PCI_D0)
268                 goto done;
269
270         pci_save_state(dev);
271
272         /* Don't change state if we don't need to */
273         if (message.event == PM_EVENT_FREEZE ||
274                         message.event == PM_EVENT_PRETHAW) {
275                 dev_dbg(&dev->dev, "--> no state change\n");
276                 goto done;
277         }
278
279         has_pci_pm = pci_find_capability(dev, PCI_CAP_ID_PM);
280         if (!has_pci_pm) {
281                 dev_dbg(&dev->dev, "--> PCI D0 legacy\n");
282         } else {
283
284                 /* NOTE:  dev->current_state becomes nonzero only here, and
285                  * only for devices that support PCI PM.  Also, exiting
286                  * PCI_D3 (but not PCI_D1 or PCI_D2) is allowed to reset
287                  * some device state (e.g. as part of clock reinit).
288                  */
289                 retval = pci_set_power_state(dev, PCI_D3hot);
290                 suspend_report_result(pci_set_power_state, retval);
291                 if (retval == 0) {
292                         dev_dbg(&dev->dev, "--> PCI D3\n");
293                 } else {
294                         dev_dbg(&dev->dev, "PCI D3 suspend fail, %d\n",
295                                         retval);
296                         pci_restore_state(dev);
297                 }
298         }
299
300 #ifdef CONFIG_PPC_PMAC
301         if (retval == 0) {
302                 /* Disable ASIC clocks for USB */
303                 if (machine_is(powermac)) {
304                         struct device_node      *of_node;
305
306                         of_node = pci_device_to_OF_node(dev);
307                         if (of_node)
308                                 pmac_call_feature(PMAC_FTR_USB_ENABLE,
309                                                         of_node, 0, 0);
310                 }
311         }
312 #endif
313
314  done:
315         return retval;
316 }
317 EXPORT_SYMBOL_GPL(usb_hcd_pci_suspend_late);
318
319 /**
320  * usb_hcd_pci_resume_early - resume a PCI-based HCD before IRQs are enabled
321  * @dev: USB Host Controller being resumed
322  *
323  * Store this function in the HCD's struct pci_driver as .resume_early.
324  */
325 int usb_hcd_pci_resume_early(struct pci_dev *dev)
326 {
327         int             retval = 0;
328         pci_power_t     state = dev->current_state;
329
330 #ifdef CONFIG_PPC_PMAC
331         /* Reenable ASIC clocks for USB */
332         if (machine_is(powermac)) {
333                 struct device_node *of_node;
334
335                 of_node = pci_device_to_OF_node(dev);
336                 if (of_node)
337                         pmac_call_feature(PMAC_FTR_USB_ENABLE,
338                                                 of_node, 0, 1);
339         }
340 #endif
341
342         /* NOTE:  chip docs cover clean "real suspend" cases (what Linux
343          * calls "standby", "suspend to RAM", and so on).  There are also
344          * dirty cases when swsusp fakes a suspend in "shutdown" mode.
345          */
346         if (state != PCI_D0) {
347 #ifdef  DEBUG
348                 int     pci_pm;
349                 u16     pmcr;
350
351                 pci_pm = pci_find_capability(dev, PCI_CAP_ID_PM);
352                 pci_read_config_word(dev, pci_pm + PCI_PM_CTRL, &pmcr);
353                 pmcr &= PCI_PM_CTRL_STATE_MASK;
354                 if (pmcr) {
355                         /* Clean case:  power to USB and to HC registers was
356                          * maintained; remote wakeup is easy.
357                          */
358                         dev_dbg(&dev->dev, "resume from PCI D%d\n", pmcr);
359                 } else {
360                         /* Clean:  HC lost Vcc power, D0 uninitialized
361                          *   + Vaux may have preserved port and transceiver
362                          *     state ... for remote wakeup from D3cold
363                          *   + or not; HCD must reinit + re-enumerate
364                          *
365                          * Dirty: D0 semi-initialized cases with swsusp
366                          *   + after BIOS init
367                          *   + after Linux init (HCD statically linked)
368                          */
369                         dev_dbg(&dev->dev, "resume from previous PCI D%d\n",
370                                         state);
371                 }
372 #endif
373
374                 retval = pci_set_power_state(dev, PCI_D0);
375         } else {
376                 /* Same basic cases: clean (powered/not), dirty */
377                 dev_dbg(&dev->dev, "PCI legacy resume\n");
378         }
379
380         if (retval < 0)
381                 dev_err(&dev->dev, "can't resume: %d\n", retval);
382         else
383                 pci_restore_state(dev);
384
385         return retval;
386 }
387 EXPORT_SYMBOL_GPL(usb_hcd_pci_resume_early);
388
389 /**
390  * usb_hcd_pci_resume - power management resume of a PCI-based HCD
391  * @dev: USB Host Controller being resumed
392  *
393  * Store this function in the HCD's struct pci_driver as .resume.
394  */
395 int usb_hcd_pci_resume(struct pci_dev *dev)
396 {
397         struct usb_hcd          *hcd;
398         int                     retval;
399
400         hcd = pci_get_drvdata(dev);
401         if (hcd->state != HC_STATE_SUSPENDED) {
402                 dev_dbg(hcd->self.controller,
403                                 "can't resume, not suspended!\n");
404                 return 0;
405         }
406
407         retval = pci_enable_device(dev);
408         if (retval < 0) {
409                 dev_err(&dev->dev, "can't re-enable after resume, %d!\n",
410                                 retval);
411                 return retval;
412         }
413
414         pci_set_master(dev);
415
416         /* yes, ignore this result too... */
417         (void) pci_wake_from_d3(dev, 0);
418
419         clear_bit(HCD_FLAG_SAW_IRQ, &hcd->flags);
420
421         if (hcd->driver->pci_resume) {
422                 retval = hcd->driver->pci_resume(hcd);
423                 if (retval) {
424                         dev_err(hcd->self.controller,
425                                 "PCI post-resume error %d!\n", retval);
426                         usb_hc_died(hcd);
427                 }
428         }
429         return retval;
430 }
431 EXPORT_SYMBOL_GPL(usb_hcd_pci_resume);
432
433 #endif  /* CONFIG_PM */
434
435 /**
436  * usb_hcd_pci_shutdown - shutdown host controller
437  * @dev: USB Host Controller being shutdown
438  */
439 void usb_hcd_pci_shutdown(struct pci_dev *dev)
440 {
441         struct usb_hcd          *hcd;
442
443         hcd = pci_get_drvdata(dev);
444         if (!hcd)
445                 return;
446
447         if (hcd->driver->shutdown)
448                 hcd->driver->shutdown(hcd);
449 }
450 EXPORT_SYMBOL_GPL(usb_hcd_pci_shutdown);
451