Merge branches 'irq/genirq' and 'linus' into irq/core
[linux-2.6] / 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         int                     has_pci_pm;
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         /* Downstream ports from this root hub should already be quiesced, so
234          * there will be no DMA activity.  Now we can shut down the upstream
235          * link (except maybe for PME# resume signaling) and enter some PCI
236          * low power state, if the hardware allows.
237          */
238         pci_disable_device(dev);
239
240         pci_save_state(dev);
241
242         /* Don't fail on error to enable wakeup.  We rely on pci code
243          * to reject requests the hardware can't implement, rather
244          * than coding the same thing.
245          */
246         wake = (hcd->state == HC_STATE_SUSPENDED &&
247                         device_may_wakeup(&dev->dev));
248         w = pci_wake_from_d3(dev, wake);
249         if (w < 0)
250                 wake = w;
251         dev_dbg(&dev->dev, "wakeup: %d\n", wake);
252
253         /* Don't change state if we don't need to */
254         if (message.event == PM_EVENT_FREEZE ||
255                         message.event == PM_EVENT_PRETHAW) {
256                 dev_dbg(&dev->dev, "--> no state change\n");
257                 goto done;
258         }
259
260         has_pci_pm = pci_find_capability(dev, PCI_CAP_ID_PM);
261         if (!has_pci_pm) {
262                 dev_dbg(&dev->dev, "--> PCI D0 legacy\n");
263         } else {
264
265                 /* NOTE:  dev->current_state becomes nonzero only here, and
266                  * only for devices that support PCI PM.  Also, exiting
267                  * PCI_D3 (but not PCI_D1 or PCI_D2) is allowed to reset
268                  * some device state (e.g. as part of clock reinit).
269                  */
270                 retval = pci_set_power_state(dev, PCI_D3hot);
271                 suspend_report_result(pci_set_power_state, retval);
272                 if (retval == 0) {
273                         dev_dbg(&dev->dev, "--> PCI D3\n");
274                 } else {
275                         dev_dbg(&dev->dev, "PCI D3 suspend fail, %d\n",
276                                         retval);
277                         pci_restore_state(dev);
278                 }
279         }
280
281 #ifdef CONFIG_PPC_PMAC
282         if (retval == 0) {
283                 /* Disable ASIC clocks for USB */
284                 if (machine_is(powermac)) {
285                         struct device_node      *of_node;
286
287                         of_node = pci_device_to_OF_node(dev);
288                         if (of_node)
289                                 pmac_call_feature(PMAC_FTR_USB_ENABLE,
290                                                         of_node, 0, 0);
291                 }
292         }
293 #endif
294
295  done:
296         return retval;
297 }
298 EXPORT_SYMBOL_GPL(usb_hcd_pci_suspend);
299
300 /**
301  * usb_hcd_pci_resume - power management resume of a PCI-based HCD
302  * @dev: USB Host Controller being resumed
303  *
304  * Store this function in the HCD's struct pci_driver as .resume.
305  */
306 int usb_hcd_pci_resume(struct pci_dev *dev)
307 {
308         struct usb_hcd          *hcd;
309         int                     retval;
310
311 #ifdef CONFIG_PPC_PMAC
312         /* Reenable ASIC clocks for USB */
313         if (machine_is(powermac)) {
314                 struct device_node *of_node;
315
316                 of_node = pci_device_to_OF_node(dev);
317                 if (of_node)
318                         pmac_call_feature(PMAC_FTR_USB_ENABLE,
319                                                 of_node, 0, 1);
320         }
321 #endif
322
323         pci_restore_state(dev);
324
325         hcd = pci_get_drvdata(dev);
326         if (hcd->state != HC_STATE_SUSPENDED) {
327                 dev_dbg(hcd->self.controller,
328                                 "can't resume, not suspended!\n");
329                 return 0;
330         }
331
332         pci_enable_wake(dev, PCI_D0, false);
333
334         retval = pci_enable_device(dev);
335         if (retval < 0) {
336                 dev_err(&dev->dev, "can't re-enable after resume, %d!\n",
337                                 retval);
338                 return retval;
339         }
340
341         pci_set_master(dev);
342
343         /* yes, ignore this result too... */
344         (void) pci_wake_from_d3(dev, 0);
345
346         clear_bit(HCD_FLAG_SAW_IRQ, &hcd->flags);
347
348         if (hcd->driver->pci_resume) {
349                 retval = hcd->driver->pci_resume(hcd);
350                 if (retval) {
351                         dev_err(hcd->self.controller,
352                                 "PCI post-resume error %d!\n", retval);
353                         usb_hc_died(hcd);
354                 }
355         }
356         return retval;
357 }
358 EXPORT_SYMBOL_GPL(usb_hcd_pci_resume);
359
360 #endif  /* CONFIG_PM */
361
362 /**
363  * usb_hcd_pci_shutdown - shutdown host controller
364  * @dev: USB Host Controller being shutdown
365  */
366 void usb_hcd_pci_shutdown(struct pci_dev *dev)
367 {
368         struct usb_hcd          *hcd;
369
370         hcd = pci_get_drvdata(dev);
371         if (!hcd)
372                 return;
373
374         if (hcd->driver->shutdown)
375                 hcd->driver->shutdown(hcd);
376 }
377 EXPORT_SYMBOL_GPL(usb_hcd_pci_shutdown);
378