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Merge branch 'topic/hda-gateway' into topic/hda
[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         device_set_wakeup_enable(&dev->dev, 1);
132
133         retval = usb_add_hcd(hcd, dev->irq, IRQF_DISABLED | IRQF_SHARED);
134         if (retval != 0)
135                 goto err4;
136         return retval;
137
138  err4:
139         if (driver->flags & HCD_MEMORY) {
140                 iounmap(hcd->regs);
141  err3:
142                 release_mem_region(hcd->rsrc_start, hcd->rsrc_len);
143         } else
144                 release_region(hcd->rsrc_start, hcd->rsrc_len);
145  err2:
146         usb_put_hcd(hcd);
147  err1:
148         pci_disable_device(dev);
149         dev_err(&dev->dev, "init %s fail, %d\n", pci_name(dev), retval);
150         return retval;
151 }
152 EXPORT_SYMBOL_GPL(usb_hcd_pci_probe);
153
154
155 /* may be called without controller electrically present */
156 /* may be called with controller, bus, and devices active */
157
158 /**
159  * usb_hcd_pci_remove - shutdown processing for PCI-based HCDs
160  * @dev: USB Host Controller being removed
161  * Context: !in_interrupt()
162  *
163  * Reverses the effect of usb_hcd_pci_probe(), first invoking
164  * the HCD's stop() method.  It is always called from a thread
165  * context, normally "rmmod", "apmd", or something similar.
166  *
167  * Store this function in the HCD's struct pci_driver as remove().
168  */
169 void usb_hcd_pci_remove(struct pci_dev *dev)
170 {
171         struct usb_hcd          *hcd;
172
173         hcd = pci_get_drvdata(dev);
174         if (!hcd)
175                 return;
176
177         usb_remove_hcd(hcd);
178         if (hcd->driver->flags & HCD_MEMORY) {
179                 iounmap(hcd->regs);
180                 release_mem_region(hcd->rsrc_start, hcd->rsrc_len);
181         } else {
182                 release_region(hcd->rsrc_start, hcd->rsrc_len);
183         }
184         usb_put_hcd(hcd);
185         pci_disable_device(dev);
186 }
187 EXPORT_SYMBOL_GPL(usb_hcd_pci_remove);
188
189
190 #ifdef  CONFIG_PM
191
192 /**
193  * usb_hcd_pci_suspend - power management suspend of a PCI-based HCD
194  * @dev: USB Host Controller being suspended
195  * @message: Power Management message describing this state transition
196  *
197  * Store this function in the HCD's struct pci_driver as .suspend.
198  */
199 int usb_hcd_pci_suspend(struct pci_dev *dev, pm_message_t message)
200 {
201         struct usb_hcd          *hcd = pci_get_drvdata(dev);
202         int                     retval = 0;
203         int                     wake, w;
204
205         /* Root hub suspend should have stopped all downstream traffic,
206          * and all bus master traffic.  And done so for both the interface
207          * and the stub usb_device (which we check here).  But maybe it
208          * didn't; writing sysfs power/state files ignores such rules...
209          *
210          * We must ignore the FREEZE vs SUSPEND distinction here, because
211          * otherwise the swsusp will save (and restore) garbage state.
212          */
213         if (!(hcd->state == HC_STATE_SUSPENDED ||
214                         hcd->state == HC_STATE_HALT)) {
215                 dev_warn(&dev->dev, "Root hub is not suspended\n");
216                 retval = -EBUSY;
217                 goto done;
218         }
219
220         /* We might already be suspended (runtime PM -- not yet written) */
221         if (dev->current_state != PCI_D0)
222                 goto done;
223
224         if (hcd->driver->pci_suspend) {
225                 retval = hcd->driver->pci_suspend(hcd, message);
226                 suspend_report_result(hcd->driver->pci_suspend, retval);
227                 if (retval)
228                         goto done;
229         }
230
231         synchronize_irq(dev->irq);
232
233         /* Don't fail on error to enable wakeup.  We rely on pci code
234          * to reject requests the hardware can't implement, rather
235          * than coding the same thing.
236          */
237         wake = (hcd->state == HC_STATE_SUSPENDED &&
238                         device_may_wakeup(&dev->dev));
239         w = pci_wake_from_d3(dev, wake);
240         if (w < 0)
241                 wake = w;
242         dev_dbg(&dev->dev, "wakeup: %d\n", wake);
243
244         /* Downstream ports from this root hub should already be quiesced, so
245          * there will be no DMA activity.  Now we can shut down the upstream
246          * link (except maybe for PME# resume signaling) and enter some PCI
247          * low power state, if the hardware allows.
248          */
249         pci_disable_device(dev);
250  done:
251         return retval;
252 }
253 EXPORT_SYMBOL_GPL(usb_hcd_pci_suspend);
254
255 /**
256  * usb_hcd_pci_suspend_late - suspend a PCI-based HCD after IRQs are disabled
257  * @dev: USB Host Controller being suspended
258  * @message: Power Management message describing this state transition
259  *
260  * Store this function in the HCD's struct pci_driver as .suspend_late.
261  */
262 int usb_hcd_pci_suspend_late(struct pci_dev *dev, pm_message_t message)
263 {
264         int                     retval = 0;
265         int                     has_pci_pm;
266
267         /* We might already be suspended (runtime PM -- not yet written) */
268         if (dev->current_state != PCI_D0)
269                 goto done;
270
271         pci_save_state(dev);
272
273         /* Don't change state if we don't need to */
274         if (message.event == PM_EVENT_FREEZE ||
275                         message.event == PM_EVENT_PRETHAW) {
276                 dev_dbg(&dev->dev, "--> no state change\n");
277                 goto done;
278         }
279
280         has_pci_pm = pci_find_capability(dev, PCI_CAP_ID_PM);
281         if (!has_pci_pm) {
282                 dev_dbg(&dev->dev, "--> PCI D0 legacy\n");
283         } else {
284
285                 /* NOTE:  dev->current_state becomes nonzero only here, and
286                  * only for devices that support PCI PM.  Also, exiting
287                  * PCI_D3 (but not PCI_D1 or PCI_D2) is allowed to reset
288                  * some device state (e.g. as part of clock reinit).
289                  */
290                 retval = pci_set_power_state(dev, PCI_D3hot);
291                 suspend_report_result(pci_set_power_state, retval);
292                 if (retval == 0) {
293                         dev_dbg(&dev->dev, "--> PCI D3\n");
294                 } else {
295                         dev_dbg(&dev->dev, "PCI D3 suspend fail, %d\n",
296                                         retval);
297                         pci_restore_state(dev);
298                 }
299         }
300
301 #ifdef CONFIG_PPC_PMAC
302         if (retval == 0) {
303                 /* Disable ASIC clocks for USB */
304                 if (machine_is(powermac)) {
305                         struct device_node      *of_node;
306
307                         of_node = pci_device_to_OF_node(dev);
308                         if (of_node)
309                                 pmac_call_feature(PMAC_FTR_USB_ENABLE,
310                                                         of_node, 0, 0);
311                 }
312         }
313 #endif
314
315  done:
316         return retval;
317 }
318 EXPORT_SYMBOL_GPL(usb_hcd_pci_suspend_late);
319
320 /**
321  * usb_hcd_pci_resume_early - resume a PCI-based HCD before IRQs are enabled
322  * @dev: USB Host Controller being resumed
323  *
324  * Store this function in the HCD's struct pci_driver as .resume_early.
325  */
326 int usb_hcd_pci_resume_early(struct pci_dev *dev)
327 {
328         int             retval = 0;
329         pci_power_t     state = dev->current_state;
330
331 #ifdef CONFIG_PPC_PMAC
332         /* Reenable ASIC clocks for USB */
333         if (machine_is(powermac)) {
334                 struct device_node *of_node;
335
336                 of_node = pci_device_to_OF_node(dev);
337                 if (of_node)
338                         pmac_call_feature(PMAC_FTR_USB_ENABLE,
339                                                 of_node, 0, 1);
340         }
341 #endif
342
343         /* NOTE:  chip docs cover clean "real suspend" cases (what Linux
344          * calls "standby", "suspend to RAM", and so on).  There are also
345          * dirty cases when swsusp fakes a suspend in "shutdown" mode.
346          */
347         if (state != PCI_D0) {
348 #ifdef  DEBUG
349                 int     pci_pm;
350                 u16     pmcr;
351
352                 pci_pm = pci_find_capability(dev, PCI_CAP_ID_PM);
353                 pci_read_config_word(dev, pci_pm + PCI_PM_CTRL, &pmcr);
354                 pmcr &= PCI_PM_CTRL_STATE_MASK;
355                 if (pmcr) {
356                         /* Clean case:  power to USB and to HC registers was
357                          * maintained; remote wakeup is easy.
358                          */
359                         dev_dbg(&dev->dev, "resume from PCI D%d\n", pmcr);
360                 } else {
361                         /* Clean:  HC lost Vcc power, D0 uninitialized
362                          *   + Vaux may have preserved port and transceiver
363                          *     state ... for remote wakeup from D3cold
364                          *   + or not; HCD must reinit + re-enumerate
365                          *
366                          * Dirty: D0 semi-initialized cases with swsusp
367                          *   + after BIOS init
368                          *   + after Linux init (HCD statically linked)
369                          */
370                         dev_dbg(&dev->dev, "resume from previous PCI D%d\n",
371                                         state);
372                 }
373 #endif
374
375                 retval = pci_set_power_state(dev, PCI_D0);
376         } else {
377                 /* Same basic cases: clean (powered/not), dirty */
378                 dev_dbg(&dev->dev, "PCI legacy resume\n");
379         }
380
381         if (retval < 0)
382                 dev_err(&dev->dev, "can't resume: %d\n", retval);
383         else
384                 pci_restore_state(dev);
385
386         return retval;
387 }
388 EXPORT_SYMBOL_GPL(usb_hcd_pci_resume_early);
389
390 /**
391  * usb_hcd_pci_resume - power management resume of a PCI-based HCD
392  * @dev: USB Host Controller being resumed
393  *
394  * Store this function in the HCD's struct pci_driver as .resume.
395  */
396 int usb_hcd_pci_resume(struct pci_dev *dev)
397 {
398         struct usb_hcd          *hcd;
399         int                     retval;
400
401         hcd = pci_get_drvdata(dev);
402         if (hcd->state != HC_STATE_SUSPENDED) {
403                 dev_dbg(hcd->self.controller,
404                                 "can't resume, not suspended!\n");
405                 return 0;
406         }
407
408         retval = pci_enable_device(dev);
409         if (retval < 0) {
410                 dev_err(&dev->dev, "can't re-enable after resume, %d!\n",
411                                 retval);
412                 return retval;
413         }
414
415         pci_set_master(dev);
416
417         /* yes, ignore this result too... */
418         (void) pci_wake_from_d3(dev, 0);
419
420         clear_bit(HCD_FLAG_SAW_IRQ, &hcd->flags);
421
422         if (hcd->driver->pci_resume) {
423                 retval = hcd->driver->pci_resume(hcd);
424                 if (retval) {
425                         dev_err(hcd->self.controller,
426                                 "PCI post-resume error %d!\n", retval);
427                         usb_hc_died(hcd);
428                 }
429         }
430         return retval;
431 }
432 EXPORT_SYMBOL_GPL(usb_hcd_pci_resume);
433
434 #endif  /* CONFIG_PM */
435
436 /**
437  * usb_hcd_pci_shutdown - shutdown host controller
438  * @dev: USB Host Controller being shutdown
439  */
440 void usb_hcd_pci_shutdown(struct pci_dev *dev)
441 {
442         struct usb_hcd          *hcd;
443
444         hcd = pci_get_drvdata(dev);
445         if (!hcd)
446                 return;
447
448         if (hcd->driver->shutdown)
449                 hcd->driver->shutdown(hcd);
450 }
451 EXPORT_SYMBOL_GPL(usb_hcd_pci_shutdown);
452