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>
21 #ifdef CONFIG_USB_DEBUG
27 #include <linux/kernel.h>
28 #include <linux/module.h>
29 #include <linux/pci.h>
32 #include <linux/usb.h>
36 /* PCI-based HCs are common, but plenty of non-PCI HCs are used too */
39 /*-------------------------------------------------------------------------*/
41 /* configure so an HC device and id are always provided */
42 /* always called with process context; sleeping is OK */
45 * usb_hcd_pci_probe - initialize PCI-based HCDs
46 * @dev: USB Host Controller being probed
47 * @id: pci hotplug id connecting controller to HCD framework
48 * Context: !in_interrupt()
50 * Allocates basic PCI resources for this USB host controller, and
51 * then invokes the start() method for the HCD associated with it
52 * through the hotplug entry's driver_data.
54 * Store this function in the HCD's struct pci_driver as probe().
56 int usb_hcd_pci_probe (struct pci_dev *dev, const struct pci_device_id *id)
58 struct hc_driver *driver;
65 if (!id || !(driver = (struct hc_driver *) id->driver_data))
68 if (pci_enable_device (dev) < 0)
70 dev->current_state = PCI_D0;
71 dev->dev.power.power_state = PMSG_ON;
75 "Found HC with no IRQ. Check BIOS/PCI %s setup!\n",
81 hcd = usb_create_hcd (driver, &dev->dev, pci_name(dev));
87 if (driver->flags & HCD_MEMORY) { // EHCI, OHCI
88 hcd->rsrc_start = pci_resource_start (dev, 0);
89 hcd->rsrc_len = pci_resource_len (dev, 0);
90 if (!request_mem_region (hcd->rsrc_start, hcd->rsrc_len,
91 driver->description)) {
92 dev_dbg (&dev->dev, "controller already in use\n");
96 hcd->regs = ioremap_nocache (hcd->rsrc_start, hcd->rsrc_len);
97 if (hcd->regs == NULL) {
98 dev_dbg (&dev->dev, "error mapping memory\n");
106 for (region = 0; region < PCI_ROM_RESOURCE; region++) {
107 if (!(pci_resource_flags (dev, region) &
111 hcd->rsrc_start = pci_resource_start (dev, region);
112 hcd->rsrc_len = pci_resource_len (dev, region);
113 if (request_region (hcd->rsrc_start, hcd->rsrc_len,
114 driver->description))
117 if (region == PCI_ROM_RESOURCE) {
118 dev_dbg (&dev->dev, "no i/o regions available\n");
124 pci_set_master (dev);
126 retval = usb_add_hcd (hcd, dev->irq, SA_SHIRQ);
132 if (driver->flags & HCD_MEMORY) {
135 release_mem_region (hcd->rsrc_start, hcd->rsrc_len);
137 release_region (hcd->rsrc_start, hcd->rsrc_len);
141 pci_disable_device (dev);
142 dev_err (&dev->dev, "init %s fail, %d\n", pci_name(dev), retval);
145 EXPORT_SYMBOL (usb_hcd_pci_probe);
148 /* may be called without controller electrically present */
149 /* may be called with controller, bus, and devices active */
152 * usb_hcd_pci_remove - shutdown processing for PCI-based HCDs
153 * @dev: USB Host Controller being removed
154 * Context: !in_interrupt()
156 * Reverses the effect of usb_hcd_pci_probe(), first invoking
157 * the HCD's stop() method. It is always called from a thread
158 * context, normally "rmmod", "apmd", or something similar.
160 * Store this function in the HCD's struct pci_driver as remove().
162 void usb_hcd_pci_remove (struct pci_dev *dev)
166 hcd = pci_get_drvdata(dev);
170 usb_remove_hcd (hcd);
171 if (hcd->driver->flags & HCD_MEMORY) {
173 release_mem_region (hcd->rsrc_start, hcd->rsrc_len);
175 release_region (hcd->rsrc_start, hcd->rsrc_len);
178 pci_disable_device(dev);
180 EXPORT_SYMBOL (usb_hcd_pci_remove);
186 * usb_hcd_pci_suspend - power management suspend of a PCI-based HCD
187 * @dev: USB Host Controller being suspended
188 * @message: semantics in flux
190 * Store this function in the HCD's struct pci_driver as suspend().
192 int usb_hcd_pci_suspend (struct pci_dev *dev, pm_message_t message)
198 hcd = pci_get_drvdata(dev);
200 /* FIXME until the generic PM interfaces change a lot more, this
201 * can't use PCI D1 and D2 states. For example, the confusion
202 * between messages and states will need to vanish, and messages
203 * will need to provide a target system state again.
205 * It'll be important to learn characteristics of the target state,
206 * especially on embedded hardware where the HCD will often be in
207 * charge of an external VBUS power supply and one or more clocks.
208 * Some target system states will leave them active; others won't.
209 * (With PCI, that's often handled by platform BIOS code.)
212 /* even when the PCI layer rejects some of the PCI calls
213 * below, HCs can try global suspend and reduce DMA traffic.
214 * PM-sensitive HCDs may already have done this.
216 has_pci_pm = pci_find_capability(dev, PCI_CAP_ID_PM);
218 switch (hcd->state) {
220 /* entry if root hub wasn't yet suspended ... from sysfs,
221 * without autosuspend, or if USB_SUSPEND isn't configured.
223 case HC_STATE_RUNNING:
224 hcd->state = HC_STATE_QUIESCING;
225 retval = hcd->driver->suspend (hcd, message);
227 dev_dbg (hcd->self.controller,
228 "suspend fail, retval %d\n",
232 hcd->state = HC_STATE_SUSPENDED;
235 /* entry with CONFIG_USB_SUSPEND, or hcds that autosuspend: the
236 * controller and/or root hub will already have been suspended,
237 * but it won't be ready for a PCI resume call.
239 * FIXME only CONFIG_USB_SUSPEND guarantees hub_suspend() will
240 * have been called, otherwise root hub timers still run ...
242 case HC_STATE_SUSPENDED:
243 /* no DMA or IRQs except when HC is active */
244 if (dev->current_state == PCI_D0) {
245 pci_save_state (dev);
246 pci_disable_device (dev);
250 dev_dbg (hcd->self.controller, "--> PCI D0/legacy\n");
254 /* NOTE: dev->current_state becomes nonzero only here, and
255 * only for devices that support PCI PM. Also, exiting
256 * PCI_D3 (but not PCI_D1 or PCI_D2) is allowed to reset
257 * some device state (e.g. as part of clock reinit).
259 retval = pci_set_power_state (dev, PCI_D3hot);
261 dev_dbg (hcd->self.controller, "--> PCI D3\n");
262 retval = pci_enable_wake (dev, PCI_D3hot, hcd->remote_wakeup);
265 retval = pci_enable_wake (dev, PCI_D3cold, hcd->remote_wakeup);
266 } else if (retval < 0) {
267 dev_dbg (&dev->dev, "PCI D3 suspend fail, %d\n",
269 (void) usb_hcd_pci_resume (dev);
274 dev_dbg (hcd->self.controller, "hcd state %d; not suspended\n",
281 /* update power_state **ONLY** to make sysfs happier */
283 dev->dev.power.power_state = message;
286 EXPORT_SYMBOL (usb_hcd_pci_suspend);
289 * usb_hcd_pci_resume - power management resume of a PCI-based HCD
290 * @dev: USB Host Controller being resumed
292 * Store this function in the HCD's struct pci_driver as resume().
294 int usb_hcd_pci_resume (struct pci_dev *dev)
299 hcd = pci_get_drvdata(dev);
300 if (hcd->state != HC_STATE_SUSPENDED) {
301 dev_dbg (hcd->self.controller,
302 "can't resume, not suspended!\n");
306 /* NOTE: chip docs cover clean "real suspend" cases (what Linux
307 * calls "standby", "suspend to RAM", and so on). There are also
308 * dirty cases when swsusp fakes a suspend in "shutdown" mode.
310 if (dev->current_state != PCI_D0) {
315 pci_pm = pci_find_capability(dev, PCI_CAP_ID_PM);
316 pci_read_config_word(dev, pci_pm + PCI_PM_CTRL, &pmcr);
317 pmcr &= PCI_PM_CTRL_STATE_MASK;
319 /* Clean case: power to USB and to HC registers was
320 * maintained; remote wakeup is easy.
322 dev_dbg(hcd->self.controller, "resume from PCI D%d\n",
325 /* Clean: HC lost Vcc power, D0 uninitialized
326 * + Vaux may have preserved port and transceiver
327 * state ... for remote wakeup from D3cold
328 * + or not; HCD must reinit + re-enumerate
330 * Dirty: D0 semi-initialized cases with swsusp
332 * + after Linux init (HCD statically linked)
334 dev_dbg(hcd->self.controller,
335 "PCI D0, from previous PCI D%d\n",
339 retval = pci_enable_wake (dev, dev->current_state, 0);
341 dev_err(hcd->self.controller,
342 "can't enable_wake to %d, %d!\n",
343 dev->current_state, retval);
346 retval = pci_enable_wake (dev, PCI_D3cold, 0);
348 dev_err(hcd->self.controller,
349 "can't enable_wake to %d, %d!\n",
354 /* Same basic cases: clean (powered/not), dirty */
355 dev_dbg(hcd->self.controller, "PCI legacy resume\n");
358 /* NOTE: the PCI API itself is asymmetric here. We don't need to
359 * pci_set_power_state(PCI_D0) since that's part of re-enabling;
360 * but that won't re-enable bus mastering. Yet pci_disable_device()
361 * explicitly disables bus mastering...
363 retval = pci_enable_device (dev);
365 dev_err (hcd->self.controller,
366 "can't re-enable after resume, %d!\n", retval);
369 pci_set_master (dev);
370 pci_restore_state (dev);
372 dev->dev.power.power_state = PMSG_ON;
374 hcd->state = HC_STATE_RESUMING;
377 retval = hcd->driver->resume (hcd);
378 if (!HC_IS_RUNNING (hcd->state)) {
379 dev_dbg (hcd->self.controller,
380 "resume fail, retval %d\n", retval);
384 retval = pci_enable_device(dev);
387 EXPORT_SYMBOL (usb_hcd_pci_resume);
389 #endif /* CONFIG_PM */