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/config.h>
20 #include <linux/kernel.h>
21 #include <linux/module.h>
22 #include <linux/pci.h>
23 #include <linux/usb.h>
28 #ifdef CONFIG_PPC_PMAC
29 #include <asm/machdep.h>
30 #include <asm/pmac_feature.h>
31 #include <asm/pci-bridge.h>
39 /* PCI-based HCs are common, but plenty of non-PCI HCs are used too */
42 /*-------------------------------------------------------------------------*/
44 /* configure so an HC device and id are always provided */
45 /* always called with process context; sleeping is OK */
48 * usb_hcd_pci_probe - initialize PCI-based HCDs
49 * @dev: USB Host Controller being probed
50 * @id: pci hotplug id connecting controller to HCD framework
51 * Context: !in_interrupt()
53 * Allocates basic PCI resources for this USB host controller, and
54 * then invokes the start() method for the HCD associated with it
55 * through the hotplug entry's driver_data.
57 * Store this function in the HCD's struct pci_driver as probe().
59 int usb_hcd_pci_probe (struct pci_dev *dev, const struct pci_device_id *id)
61 struct hc_driver *driver;
68 if (!id || !(driver = (struct hc_driver *) id->driver_data))
71 if (pci_enable_device (dev) < 0)
73 dev->current_state = PCI_D0;
74 dev->dev.power.power_state = PMSG_ON;
78 "Found HC with no IRQ. Check BIOS/PCI %s setup!\n",
84 hcd = usb_create_hcd (driver, &dev->dev, pci_name(dev));
90 if (driver->flags & HCD_MEMORY) { // EHCI, OHCI
91 hcd->rsrc_start = pci_resource_start (dev, 0);
92 hcd->rsrc_len = pci_resource_len (dev, 0);
93 if (!request_mem_region (hcd->rsrc_start, hcd->rsrc_len,
94 driver->description)) {
95 dev_dbg (&dev->dev, "controller already in use\n");
99 hcd->regs = ioremap_nocache (hcd->rsrc_start, hcd->rsrc_len);
100 if (hcd->regs == NULL) {
101 dev_dbg (&dev->dev, "error mapping memory\n");
109 for (region = 0; region < PCI_ROM_RESOURCE; region++) {
110 if (!(pci_resource_flags (dev, region) &
114 hcd->rsrc_start = pci_resource_start (dev, region);
115 hcd->rsrc_len = pci_resource_len (dev, region);
116 if (request_region (hcd->rsrc_start, hcd->rsrc_len,
117 driver->description))
120 if (region == PCI_ROM_RESOURCE) {
121 dev_dbg (&dev->dev, "no i/o regions available\n");
127 pci_set_master (dev);
129 retval = usb_add_hcd (hcd, dev->irq, SA_SHIRQ);
135 if (driver->flags & HCD_MEMORY) {
138 release_mem_region (hcd->rsrc_start, hcd->rsrc_len);
140 release_region (hcd->rsrc_start, hcd->rsrc_len);
144 pci_disable_device (dev);
145 dev_err (&dev->dev, "init %s fail, %d\n", pci_name(dev), retval);
148 EXPORT_SYMBOL (usb_hcd_pci_probe);
151 /* may be called without controller electrically present */
152 /* may be called with controller, bus, and devices active */
155 * usb_hcd_pci_remove - shutdown processing for PCI-based HCDs
156 * @dev: USB Host Controller being removed
157 * Context: !in_interrupt()
159 * Reverses the effect of usb_hcd_pci_probe(), first invoking
160 * the HCD's stop() method. It is always called from a thread
161 * context, normally "rmmod", "apmd", or something similar.
163 * Store this function in the HCD's struct pci_driver as remove().
165 void usb_hcd_pci_remove (struct pci_dev *dev)
169 hcd = pci_get_drvdata(dev);
173 usb_remove_hcd (hcd);
174 if (hcd->driver->flags & HCD_MEMORY) {
176 release_mem_region (hcd->rsrc_start, hcd->rsrc_len);
178 release_region (hcd->rsrc_start, hcd->rsrc_len);
181 pci_disable_device(dev);
183 EXPORT_SYMBOL (usb_hcd_pci_remove);
189 * usb_hcd_pci_suspend - power management suspend of a PCI-based HCD
190 * @dev: USB Host Controller being suspended
191 * @message: semantics in flux
193 * Store this function in the HCD's struct pci_driver as suspend().
195 int usb_hcd_pci_suspend (struct pci_dev *dev, pm_message_t message)
201 hcd = pci_get_drvdata(dev);
203 /* Root hub suspend should have stopped all downstream traffic,
204 * and all bus master traffic. And done so for both the interface
205 * and the stub usb_device (which we check here). But maybe it
206 * didn't; writing sysfs power/state files ignores such rules...
208 * We must ignore the FREEZE vs SUSPEND distinction here, because
209 * otherwise the swsusp will save (and restore) garbage state.
211 if (hcd->self.root_hub->dev.power.power_state.event == PM_EVENT_ON)
214 if (hcd->driver->suspend) {
215 retval = hcd->driver->suspend(hcd, message);
217 dev_dbg (&dev->dev, "PCI pre-suspend fail, %d\n",
222 synchronize_irq(dev->irq);
224 /* FIXME until the generic PM interfaces change a lot more, this
225 * can't use PCI D1 and D2 states. For example, the confusion
226 * between messages and states will need to vanish, and messages
227 * will need to provide a target system state again.
229 * It'll be important to learn characteristics of the target state,
230 * especially on embedded hardware where the HCD will often be in
231 * charge of an external VBUS power supply and one or more clocks.
232 * Some target system states will leave them active; others won't.
233 * (With PCI, that's often handled by platform BIOS code.)
236 /* even when the PCI layer rejects some of the PCI calls
237 * below, HCs can try global suspend and reduce DMA traffic.
238 * PM-sensitive HCDs may already have done this.
240 has_pci_pm = pci_find_capability(dev, PCI_CAP_ID_PM);
242 /* Downstream ports from this root hub should already be quiesced, so
243 * there will be no DMA activity. Now we can shut down the upstream
244 * link (except maybe for PME# resume signaling) and enter some PCI
245 * low power state, if the hardware allows.
247 if (hcd->state == HC_STATE_SUSPENDED) {
249 /* no DMA or IRQs except when HC is active */
250 if (dev->current_state == PCI_D0) {
251 pci_save_state (dev);
252 pci_disable_device (dev);
256 dev_dbg (hcd->self.controller, "--> PCI D0/legacy\n");
260 /* NOTE: dev->current_state becomes nonzero only here, and
261 * only for devices that support PCI PM. Also, exiting
262 * PCI_D3 (but not PCI_D1 or PCI_D2) is allowed to reset
263 * some device state (e.g. as part of clock reinit).
265 retval = pci_set_power_state (dev, PCI_D3hot);
267 int wake = device_can_wakeup(&hcd->self.root_hub->dev);
269 wake = wake && device_may_wakeup(hcd->self.controller);
271 dev_dbg (hcd->self.controller, "--> PCI D3%s\n",
272 wake ? "/wakeup" : "");
274 /* Ignore these return values. We rely on pci code to
275 * reject requests the hardware can't implement, rather
276 * than coding the same thing.
278 (void) pci_enable_wake (dev, PCI_D3hot, wake);
279 (void) pci_enable_wake (dev, PCI_D3cold, wake);
281 dev_dbg (&dev->dev, "PCI D3 suspend fail, %d\n",
283 (void) usb_hcd_pci_resume (dev);
287 dev_dbg (hcd->self.controller, "hcd state %d; not suspended\n",
295 dev->dev.power.power_state = PMSG_SUSPEND;
297 #ifdef CONFIG_PPC_PMAC
298 /* Disable ASIC clocks for USB */
299 if (machine_is(powermac)) {
300 struct device_node *of_node;
302 of_node = pci_device_to_OF_node (dev);
304 pmac_call_feature(PMAC_FTR_USB_ENABLE,
312 EXPORT_SYMBOL (usb_hcd_pci_suspend);
315 * usb_hcd_pci_resume - power management resume of a PCI-based HCD
316 * @dev: USB Host Controller being resumed
318 * Store this function in the HCD's struct pci_driver as resume().
320 int usb_hcd_pci_resume (struct pci_dev *dev)
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");
332 #ifdef CONFIG_PPC_PMAC
333 /* Reenable ASIC clocks for USB */
334 if (machine_is(powermac)) {
335 struct device_node *of_node;
337 of_node = pci_device_to_OF_node (dev);
339 pmac_call_feature (PMAC_FTR_USB_ENABLE,
344 /* NOTE: chip docs cover clean "real suspend" cases (what Linux
345 * calls "standby", "suspend to RAM", and so on). There are also
346 * dirty cases when swsusp fakes a suspend in "shutdown" mode.
348 if (dev->current_state != PCI_D0) {
353 pci_pm = pci_find_capability(dev, PCI_CAP_ID_PM);
354 pci_read_config_word(dev, pci_pm + PCI_PM_CTRL, &pmcr);
355 pmcr &= PCI_PM_CTRL_STATE_MASK;
357 /* Clean case: power to USB and to HC registers was
358 * maintained; remote wakeup is easy.
360 dev_dbg(hcd->self.controller, "resume from PCI D%d\n",
363 /* Clean: HC lost Vcc power, D0 uninitialized
364 * + Vaux may have preserved port and transceiver
365 * state ... for remote wakeup from D3cold
366 * + or not; HCD must reinit + re-enumerate
368 * Dirty: D0 semi-initialized cases with swsusp
370 * + after Linux init (HCD statically linked)
372 dev_dbg(hcd->self.controller,
373 "PCI D0, from previous PCI D%d\n",
377 /* yes, ignore these results too... */
378 (void) pci_enable_wake (dev, dev->current_state, 0);
379 (void) pci_enable_wake (dev, PCI_D3cold, 0);
381 /* Same basic cases: clean (powered/not), dirty */
382 dev_dbg(hcd->self.controller, "PCI legacy resume\n");
385 /* NOTE: the PCI API itself is asymmetric here. We don't need to
386 * pci_set_power_state(PCI_D0) since that's part of re-enabling;
387 * but that won't re-enable bus mastering. Yet pci_disable_device()
388 * explicitly disables bus mastering...
390 retval = pci_enable_device (dev);
392 dev_err (hcd->self.controller,
393 "can't re-enable after resume, %d!\n", retval);
396 pci_set_master (dev);
397 pci_restore_state (dev);
399 dev->dev.power.power_state = PMSG_ON;
401 clear_bit(HCD_FLAG_SAW_IRQ, &hcd->flags);
403 if (hcd->driver->resume) {
404 retval = hcd->driver->resume(hcd);
406 dev_err (hcd->self.controller,
407 "PCI post-resume error %d!\n", retval);
414 EXPORT_SYMBOL (usb_hcd_pci_resume);
416 #endif /* CONFIG_PM */