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1da177e4 LT |
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 | ||
1da177e4 LT |
19 | #include <linux/kernel.h> |
20 | #include <linux/module.h> | |
21 | #include <linux/pci.h> | |
21b1861f DB |
22 | #include <linux/usb.h> |
23 | ||
1da177e4 LT |
24 | #include <asm/io.h> |
25 | #include <asm/irq.h> | |
21b1861f DB |
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 | |
5f827ea3 DB |
33 | |
34 | #include "usb.h" | |
1da177e4 LT |
35 | #include "hcd.h" |
36 | ||
37 | ||
c6053ecf | 38 | /* PCI-based HCs are common, but plenty of non-PCI HCs are used too */ |
1da177e4 LT |
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 || !(driver = (struct hc_driver *) id->driver_data)) | |
68 | return -EINVAL; | |
69 | ||
70 | if (pci_enable_device (dev) < 0) | |
71 | return -ENODEV; | |
c6053ecf DB |
72 | dev->current_state = PCI_D0; |
73 | dev->dev.power.power_state = PMSG_ON; | |
1da177e4 LT |
74 | |
75 | if (!dev->irq) { | |
76 | dev_err (&dev->dev, | |
77 | "Found HC with no IRQ. Check BIOS/PCI %s setup!\n", | |
78 | pci_name(dev)); | |
79 | retval = -ENODEV; | |
80 | goto err1; | |
81 | } | |
82 | ||
83 | hcd = usb_create_hcd (driver, &dev->dev, pci_name(dev)); | |
84 | if (!hcd) { | |
85 | retval = -ENOMEM; | |
86 | goto err1; | |
87 | } | |
88 | ||
89 | if (driver->flags & HCD_MEMORY) { // EHCI, OHCI | |
90 | hcd->rsrc_start = pci_resource_start (dev, 0); | |
91 | hcd->rsrc_len = pci_resource_len (dev, 0); | |
92 | if (!request_mem_region (hcd->rsrc_start, hcd->rsrc_len, | |
93 | driver->description)) { | |
94 | dev_dbg (&dev->dev, "controller already in use\n"); | |
95 | retval = -EBUSY; | |
96 | goto err2; | |
97 | } | |
98 | hcd->regs = ioremap_nocache (hcd->rsrc_start, hcd->rsrc_len); | |
99 | if (hcd->regs == NULL) { | |
100 | dev_dbg (&dev->dev, "error mapping memory\n"); | |
101 | retval = -EFAULT; | |
102 | goto err3; | |
103 | } | |
104 | ||
105 | } else { // UHCI | |
106 | int region; | |
107 | ||
108 | for (region = 0; region < PCI_ROM_RESOURCE; region++) { | |
109 | if (!(pci_resource_flags (dev, region) & | |
110 | IORESOURCE_IO)) | |
111 | continue; | |
112 | ||
113 | hcd->rsrc_start = pci_resource_start (dev, region); | |
114 | hcd->rsrc_len = pci_resource_len (dev, region); | |
115 | if (request_region (hcd->rsrc_start, hcd->rsrc_len, | |
116 | driver->description)) | |
117 | break; | |
118 | } | |
119 | if (region == PCI_ROM_RESOURCE) { | |
120 | dev_dbg (&dev->dev, "no i/o regions available\n"); | |
121 | retval = -EBUSY; | |
122 | goto err1; | |
123 | } | |
124 | } | |
125 | ||
1da177e4 LT |
126 | pci_set_master (dev); |
127 | ||
d54b5caa | 128 | retval = usb_add_hcd (hcd, dev->irq, IRQF_SHARED); |
1da177e4 LT |
129 | if (retval != 0) |
130 | goto err4; | |
131 | return retval; | |
132 | ||
133 | err4: | |
134 | if (driver->flags & HCD_MEMORY) { | |
135 | iounmap (hcd->regs); | |
136 | err3: | |
137 | release_mem_region (hcd->rsrc_start, hcd->rsrc_len); | |
138 | } else | |
139 | release_region (hcd->rsrc_start, hcd->rsrc_len); | |
140 | err2: | |
141 | usb_put_hcd (hcd); | |
142 | err1: | |
143 | pci_disable_device (dev); | |
144 | dev_err (&dev->dev, "init %s fail, %d\n", pci_name(dev), retval); | |
145 | return retval; | |
146 | } | |
147 | EXPORT_SYMBOL (usb_hcd_pci_probe); | |
148 | ||
149 | ||
150 | /* may be called without controller electrically present */ | |
151 | /* may be called with controller, bus, and devices active */ | |
152 | ||
153 | /** | |
154 | * usb_hcd_pci_remove - shutdown processing for PCI-based HCDs | |
155 | * @dev: USB Host Controller being removed | |
156 | * Context: !in_interrupt() | |
157 | * | |
158 | * Reverses the effect of usb_hcd_pci_probe(), first invoking | |
159 | * the HCD's stop() method. It is always called from a thread | |
160 | * context, normally "rmmod", "apmd", or something similar. | |
161 | * | |
162 | * Store this function in the HCD's struct pci_driver as remove(). | |
163 | */ | |
164 | void usb_hcd_pci_remove (struct pci_dev *dev) | |
165 | { | |
166 | struct usb_hcd *hcd; | |
167 | ||
168 | hcd = pci_get_drvdata(dev); | |
169 | if (!hcd) | |
170 | return; | |
171 | ||
172 | usb_remove_hcd (hcd); | |
173 | if (hcd->driver->flags & HCD_MEMORY) { | |
174 | iounmap (hcd->regs); | |
175 | release_mem_region (hcd->rsrc_start, hcd->rsrc_len); | |
176 | } else { | |
177 | release_region (hcd->rsrc_start, hcd->rsrc_len); | |
178 | } | |
179 | usb_put_hcd (hcd); | |
180 | pci_disable_device(dev); | |
181 | } | |
182 | EXPORT_SYMBOL (usb_hcd_pci_remove); | |
183 | ||
184 | ||
185 | #ifdef CONFIG_PM | |
186 | ||
1da177e4 LT |
187 | /** |
188 | * usb_hcd_pci_suspend - power management suspend of a PCI-based HCD | |
189 | * @dev: USB Host Controller being suspended | |
c6053ecf | 190 | * @message: semantics in flux |
1da177e4 LT |
191 | * |
192 | * Store this function in the HCD's struct pci_driver as suspend(). | |
193 | */ | |
c6053ecf | 194 | int usb_hcd_pci_suspend (struct pci_dev *dev, pm_message_t message) |
1da177e4 LT |
195 | { |
196 | struct usb_hcd *hcd; | |
197 | int retval = 0; | |
198 | int has_pci_pm; | |
199 | ||
200 | hcd = pci_get_drvdata(dev); | |
201 | ||
5f827ea3 DB |
202 | /* Root hub suspend should have stopped all downstream traffic, |
203 | * and all bus master traffic. And done so for both the interface | |
204 | * and the stub usb_device (which we check here). But maybe it | |
205 | * didn't; writing sysfs power/state files ignores such rules... | |
206 | * | |
207 | * We must ignore the FREEZE vs SUSPEND distinction here, because | |
208 | * otherwise the swsusp will save (and restore) garbage state. | |
209 | */ | |
210 | if (hcd->self.root_hub->dev.power.power_state.event == PM_EVENT_ON) | |
211 | return -EBUSY; | |
212 | ||
213 | if (hcd->driver->suspend) { | |
214 | retval = hcd->driver->suspend(hcd, message); | |
02669492 AM |
215 | suspend_report_result(hcd->driver->suspend, retval); |
216 | if (retval) | |
5f827ea3 | 217 | goto done; |
5f827ea3 | 218 | } |
8de98402 | 219 | synchronize_irq(dev->irq); |
5f827ea3 | 220 | |
c6053ecf DB |
221 | /* FIXME until the generic PM interfaces change a lot more, this |
222 | * can't use PCI D1 and D2 states. For example, the confusion | |
223 | * between messages and states will need to vanish, and messages | |
224 | * will need to provide a target system state again. | |
225 | * | |
226 | * It'll be important to learn characteristics of the target state, | |
227 | * especially on embedded hardware where the HCD will often be in | |
228 | * charge of an external VBUS power supply and one or more clocks. | |
229 | * Some target system states will leave them active; others won't. | |
230 | * (With PCI, that's often handled by platform BIOS code.) | |
231 | */ | |
232 | ||
1da177e4 LT |
233 | /* even when the PCI layer rejects some of the PCI calls |
234 | * below, HCs can try global suspend and reduce DMA traffic. | |
235 | * PM-sensitive HCDs may already have done this. | |
236 | */ | |
237 | has_pci_pm = pci_find_capability(dev, PCI_CAP_ID_PM); | |
1da177e4 | 238 | |
5f827ea3 DB |
239 | /* Downstream ports from this root hub should already be quiesced, so |
240 | * there will be no DMA activity. Now we can shut down the upstream | |
241 | * link (except maybe for PME# resume signaling) and enter some PCI | |
242 | * low power state, if the hardware allows. | |
1da177e4 | 243 | */ |
5f827ea3 | 244 | if (hcd->state == HC_STATE_SUSPENDED) { |
1da177e4 | 245 | |
c6053ecf DB |
246 | /* no DMA or IRQs except when HC is active */ |
247 | if (dev->current_state == PCI_D0) { | |
1da177e4 LT |
248 | pci_save_state (dev); |
249 | pci_disable_device (dev); | |
1da177e4 LT |
250 | } |
251 | ||
252 | if (!has_pci_pm) { | |
253 | dev_dbg (hcd->self.controller, "--> PCI D0/legacy\n"); | |
5f827ea3 | 254 | goto done; |
1da177e4 LT |
255 | } |
256 | ||
c6053ecf DB |
257 | /* NOTE: dev->current_state becomes nonzero only here, and |
258 | * only for devices that support PCI PM. Also, exiting | |
259 | * PCI_D3 (but not PCI_D1 or PCI_D2) is allowed to reset | |
260 | * some device state (e.g. as part of clock reinit). | |
1da177e4 | 261 | */ |
c6053ecf | 262 | retval = pci_set_power_state (dev, PCI_D3hot); |
02669492 | 263 | suspend_report_result(pci_set_power_state, retval); |
1da177e4 | 264 | if (retval == 0) { |
fb669cc0 DB |
265 | int wake = device_can_wakeup(&hcd->self.root_hub->dev); |
266 | ||
267 | wake = wake && device_may_wakeup(hcd->self.controller); | |
268 | ||
269 | dev_dbg (hcd->self.controller, "--> PCI D3%s\n", | |
270 | wake ? "/wakeup" : ""); | |
5f827ea3 DB |
271 | |
272 | /* Ignore these return values. We rely on pci code to | |
273 | * reject requests the hardware can't implement, rather | |
274 | * than coding the same thing. | |
275 | */ | |
fb669cc0 DB |
276 | (void) pci_enable_wake (dev, PCI_D3hot, wake); |
277 | (void) pci_enable_wake (dev, PCI_D3cold, wake); | |
5f827ea3 | 278 | } else { |
c6053ecf DB |
279 | dev_dbg (&dev->dev, "PCI D3 suspend fail, %d\n", |
280 | retval); | |
1da177e4 | 281 | (void) usb_hcd_pci_resume (dev); |
1da177e4 | 282 | } |
5f827ea3 | 283 | |
18584999 | 284 | } else if (hcd->state != HC_STATE_HALT) { |
1da177e4 LT |
285 | dev_dbg (hcd->self.controller, "hcd state %d; not suspended\n", |
286 | hcd->state); | |
c6053ecf | 287 | WARN_ON(1); |
1da177e4 | 288 | retval = -EINVAL; |
1da177e4 LT |
289 | } |
290 | ||
5f827ea3 | 291 | done: |
21b1861f | 292 | if (retval == 0) { |
5f827ea3 | 293 | dev->dev.power.power_state = PMSG_SUSPEND; |
21b1861f DB |
294 | |
295 | #ifdef CONFIG_PPC_PMAC | |
296 | /* Disable ASIC clocks for USB */ | |
e8222502 | 297 | if (machine_is(powermac)) { |
21b1861f DB |
298 | struct device_node *of_node; |
299 | ||
300 | of_node = pci_device_to_OF_node (dev); | |
301 | if (of_node) | |
302 | pmac_call_feature(PMAC_FTR_USB_ENABLE, | |
303 | of_node, 0, 0); | |
304 | } | |
305 | #endif | |
306 | } | |
307 | ||
1da177e4 LT |
308 | return retval; |
309 | } | |
310 | EXPORT_SYMBOL (usb_hcd_pci_suspend); | |
311 | ||
312 | /** | |
313 | * usb_hcd_pci_resume - power management resume of a PCI-based HCD | |
314 | * @dev: USB Host Controller being resumed | |
315 | * | |
316 | * Store this function in the HCD's struct pci_driver as resume(). | |
317 | */ | |
318 | int usb_hcd_pci_resume (struct pci_dev *dev) | |
319 | { | |
320 | struct usb_hcd *hcd; | |
321 | int retval; | |
1da177e4 LT |
322 | |
323 | hcd = pci_get_drvdata(dev); | |
324 | if (hcd->state != HC_STATE_SUSPENDED) { | |
325 | dev_dbg (hcd->self.controller, | |
326 | "can't resume, not suspended!\n"); | |
327 | return 0; | |
328 | } | |
1da177e4 | 329 | |
21b1861f DB |
330 | #ifdef CONFIG_PPC_PMAC |
331 | /* Reenable ASIC clocks for USB */ | |
e8222502 | 332 | if (machine_is(powermac)) { |
21b1861f DB |
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 | ||
c6053ecf DB |
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 (dev->current_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(hcd->self.controller, "resume from PCI D%d\n", | |
359 | 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(hcd->self.controller, | |
371 | "PCI D0, from previous PCI D%d\n", | |
372 | dev->current_state); | |
373 | } | |
374 | #endif | |
5f827ea3 DB |
375 | /* yes, ignore these results too... */ |
376 | (void) pci_enable_wake (dev, dev->current_state, 0); | |
377 | (void) pci_enable_wake (dev, PCI_D3cold, 0); | |
c6053ecf DB |
378 | } else { |
379 | /* Same basic cases: clean (powered/not), dirty */ | |
380 | dev_dbg(hcd->self.controller, "PCI legacy resume\n"); | |
381 | } | |
382 | ||
383 | /* NOTE: the PCI API itself is asymmetric here. We don't need to | |
384 | * pci_set_power_state(PCI_D0) since that's part of re-enabling; | |
385 | * but that won't re-enable bus mastering. Yet pci_disable_device() | |
386 | * explicitly disables bus mastering... | |
387 | */ | |
388 | retval = pci_enable_device (dev); | |
389 | if (retval < 0) { | |
390 | dev_err (hcd->self.controller, | |
391 | "can't re-enable after resume, %d!\n", retval); | |
392 | return retval; | |
393 | } | |
394 | pci_set_master (dev); | |
395 | pci_restore_state (dev); | |
396 | ||
397 | dev->dev.power.power_state = PMSG_ON; | |
1da177e4 | 398 | |
8de98402 | 399 | clear_bit(HCD_FLAG_SAW_IRQ, &hcd->flags); |
1da177e4 | 400 | |
5f827ea3 DB |
401 | if (hcd->driver->resume) { |
402 | retval = hcd->driver->resume(hcd); | |
403 | if (retval) { | |
404 | dev_err (hcd->self.controller, | |
405 | "PCI post-resume error %d!\n", retval); | |
406 | usb_hc_died (hcd); | |
407 | } | |
1da177e4 LT |
408 | } |
409 | ||
410 | return retval; | |
411 | } | |
412 | EXPORT_SYMBOL (usb_hcd_pci_resume); | |
413 | ||
414 | #endif /* CONFIG_PM */ | |
415 | ||
416 |