2 * (C) Copyright David Brownell 2000-2002
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.
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
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.
19 #include <linux/kernel.h>
20 #include <linux/module.h>
21 #include <linux/pci.h>
22 #include <linux/usb.h>
27 #ifdef CONFIG_PPC_PMAC
28 #include <asm/machdep.h>
29 #include <asm/pmac_feature.h>
30 #include <asm/pci-bridge.h>
38 /* PCI-based HCs are common, but plenty of non-PCI HCs are used too */
41 /*-------------------------------------------------------------------------*/
43 /* configure so an HC device and id are always provided */
44 /* always called with process context; sleeping is OK */
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()
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.
56 * Store this function in the HCD's struct pci_driver as probe().
58 int usb_hcd_pci_probe (struct pci_dev *dev, const struct pci_device_id *id)
60 struct hc_driver *driver;
67 if (!id || !(driver = (struct hc_driver *) id->driver_data))
70 if (pci_enable_device (dev) < 0)
72 dev->current_state = PCI_D0;
73 dev->dev.power.power_state = PMSG_ON;
77 "Found HC with no IRQ. Check BIOS/PCI %s setup!\n",
83 hcd = usb_create_hcd (driver, &dev->dev, pci_name(dev));
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");
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");
108 for (region = 0; region < PCI_ROM_RESOURCE; region++) {
109 if (!(pci_resource_flags (dev, region) &
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))
119 if (region == PCI_ROM_RESOURCE) {
120 dev_dbg (&dev->dev, "no i/o regions available\n");
126 pci_set_master (dev);
128 retval = usb_add_hcd (hcd, dev->irq, IRQF_SHARED);
134 if (driver->flags & HCD_MEMORY) {
137 release_mem_region (hcd->rsrc_start, hcd->rsrc_len);
139 release_region (hcd->rsrc_start, hcd->rsrc_len);
143 pci_disable_device (dev);
144 dev_err (&dev->dev, "init %s fail, %d\n", pci_name(dev), retval);
147 EXPORT_SYMBOL (usb_hcd_pci_probe);
150 /* may be called without controller electrically present */
151 /* may be called with controller, bus, and devices active */
154 * usb_hcd_pci_remove - shutdown processing for PCI-based HCDs
155 * @dev: USB Host Controller being removed
156 * Context: !in_interrupt()
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.
162 * Store this function in the HCD's struct pci_driver as remove().
164 void usb_hcd_pci_remove (struct pci_dev *dev)
168 hcd = pci_get_drvdata(dev);
172 usb_remove_hcd (hcd);
173 if (hcd->driver->flags & HCD_MEMORY) {
175 release_mem_region (hcd->rsrc_start, hcd->rsrc_len);
177 release_region (hcd->rsrc_start, hcd->rsrc_len);
180 pci_disable_device(dev);
182 EXPORT_SYMBOL (usb_hcd_pci_remove);
188 * usb_hcd_pci_suspend - power management suspend of a PCI-based HCD
189 * @dev: USB Host Controller being suspended
190 * @message: semantics in flux
192 * Store this function in the HCD's struct pci_driver as suspend().
194 int usb_hcd_pci_suspend (struct pci_dev *dev, pm_message_t message)
200 hcd = pci_get_drvdata(dev);
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...
207 * We must ignore the FREEZE vs SUSPEND distinction here, because
208 * otherwise the swsusp will save (and restore) garbage state.
210 if (hcd->self.root_hub->dev.power.power_state.event == PM_EVENT_ON)
213 if (hcd->driver->suspend) {
214 retval = hcd->driver->suspend(hcd, message);
215 suspend_report_result(hcd->driver->suspend, retval);
219 synchronize_irq(dev->irq);
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.
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.)
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.
237 has_pci_pm = pci_find_capability(dev, PCI_CAP_ID_PM);
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.
244 if (hcd->state == HC_STATE_SUSPENDED) {
246 /* no DMA or IRQs except when HC is active */
247 if (dev->current_state == PCI_D0) {
248 pci_save_state (dev);
249 pci_disable_device (dev);
253 dev_dbg (hcd->self.controller, "--> PCI D0/legacy\n");
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).
262 retval = pci_set_power_state (dev, PCI_D3hot);
263 suspend_report_result(pci_set_power_state, retval);
265 int wake = device_can_wakeup(&hcd->self.root_hub->dev);
267 wake = wake && device_may_wakeup(hcd->self.controller);
269 dev_dbg (hcd->self.controller, "--> PCI D3%s\n",
270 wake ? "/wakeup" : "");
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.
276 (void) pci_enable_wake (dev, PCI_D3hot, wake);
277 (void) pci_enable_wake (dev, PCI_D3cold, wake);
279 dev_dbg (&dev->dev, "PCI D3 suspend fail, %d\n",
281 (void) usb_hcd_pci_resume (dev);
285 dev_dbg (hcd->self.controller, "hcd state %d; not suspended\n",
293 dev->dev.power.power_state = PMSG_SUSPEND;
295 #ifdef CONFIG_PPC_PMAC
296 /* Disable ASIC clocks for USB */
297 if (machine_is(powermac)) {
298 struct device_node *of_node;
300 of_node = pci_device_to_OF_node (dev);
302 pmac_call_feature(PMAC_FTR_USB_ENABLE,
310 EXPORT_SYMBOL (usb_hcd_pci_suspend);
313 * usb_hcd_pci_resume - power management resume of a PCI-based HCD
314 * @dev: USB Host Controller being resumed
316 * Store this function in the HCD's struct pci_driver as resume().
318 int usb_hcd_pci_resume (struct pci_dev *dev)
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");
330 #ifdef CONFIG_PPC_PMAC
331 /* Reenable ASIC clocks for USB */
332 if (machine_is(powermac)) {
333 struct device_node *of_node;
335 of_node = pci_device_to_OF_node (dev);
337 pmac_call_feature (PMAC_FTR_USB_ENABLE,
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.
346 if (dev->current_state != PCI_D0) {
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;
355 /* Clean case: power to USB and to HC registers was
356 * maintained; remote wakeup is easy.
358 dev_dbg(hcd->self.controller, "resume from PCI D%d\n",
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
366 * Dirty: D0 semi-initialized cases with swsusp
368 * + after Linux init (HCD statically linked)
370 dev_dbg(hcd->self.controller,
371 "PCI D0, from previous PCI D%d\n",
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);
379 /* Same basic cases: clean (powered/not), dirty */
380 dev_dbg(hcd->self.controller, "PCI legacy resume\n");
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...
388 retval = pci_enable_device (dev);
390 dev_err (hcd->self.controller,
391 "can't re-enable after resume, %d!\n", retval);
394 pci_set_master (dev);
395 pci_restore_state (dev);
397 dev->dev.power.power_state = PMSG_ON;
399 clear_bit(HCD_FLAG_SAW_IRQ, &hcd->flags);
401 if (hcd->driver->resume) {
402 retval = hcd->driver->resume(hcd);
404 dev_err (hcd->self.controller,
405 "PCI post-resume error %d!\n", retval);
412 EXPORT_SYMBOL (usb_hcd_pci_resume);
414 #endif /* CONFIG_PM */