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/config.h> 20 21 #ifdef CONFIG_USB_DEBUG 22 #define DEBUG 23 #else 24 #undef DEBUG 25 #endif 26 27 #include <linux/kernel.h> 28 #include <linux/module.h> 29 #include <linux/pci.h> 30 #include <asm/io.h> 31 #include <asm/irq.h> 32 #include <linux/usb.h> 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 || !(driver = (struct hc_driver *) id->driver_data)) 68 return -EINVAL; 69 70 if (pci_enable_device (dev) < 0) 71 return -ENODEV; 72 dev->current_state = PCI_D0; 73 dev->dev.power.power_state = PMSG_ON; 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 } 125 126 pci_set_master (dev); 127 128 retval = usb_add_hcd (hcd, dev->irq, SA_SHIRQ); 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 186 187 /** 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 191 * 192 * Store this function in the HCD's struct pci_driver as suspend(). 193 */ 194 int usb_hcd_pci_suspend (struct pci_dev *dev, pm_message_t message) 195 { 196 struct usb_hcd *hcd; 197 int retval = 0; 198 int has_pci_pm; 199 200 hcd = pci_get_drvdata(dev); 201 202 /* 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); 215 if (retval) { 216 dev_dbg (&dev->dev, "PCI pre-suspend fail, %d\n", 217 retval); 218 goto done; 219 } 220 } 221 222 /* FIXME until the generic PM interfaces change a lot more, this 223 * can't use PCI D1 and D2 states. For example, the confusion 224 * between messages and states will need to vanish, and messages 225 * will need to provide a target system state again. 226 * 227 * It'll be important to learn characteristics of the target state, 228 * especially on embedded hardware where the HCD will often be in 229 * charge of an external VBUS power supply and one or more clocks. 230 * Some target system states will leave them active; others won't. 231 * (With PCI, that's often handled by platform BIOS code.) 232 */ 233 234 /* even when the PCI layer rejects some of the PCI calls 235 * below, HCs can try global suspend and reduce DMA traffic. 236 * PM-sensitive HCDs may already have done this. 237 */ 238 has_pci_pm = pci_find_capability(dev, PCI_CAP_ID_PM); 239 240 /* Downstream ports from this root hub should already be quiesced, so 241 * there will be no DMA activity. Now we can shut down the upstream 242 * link (except maybe for PME# resume signaling) and enter some PCI 243 * low power state, if the hardware allows. 244 */ 245 if (hcd->state == HC_STATE_SUSPENDED) { 246 247 /* no DMA or IRQs except when HC is active */ 248 if (dev->current_state == PCI_D0) { 249 pci_save_state (dev); 250 pci_disable_device (dev); 251 } 252 253 if (!has_pci_pm) { 254 dev_dbg (hcd->self.controller, "--> PCI D0/legacy\n"); 255 goto done; 256 } 257 258 /* NOTE: dev->current_state becomes nonzero only here, and 259 * only for devices that support PCI PM. Also, exiting 260 * PCI_D3 (but not PCI_D1 or PCI_D2) is allowed to reset 261 * some device state (e.g. as part of clock reinit). 262 */ 263 retval = pci_set_power_state (dev, PCI_D3hot); 264 if (retval == 0) { 265 dev_dbg (hcd->self.controller, "--> PCI D3\n"); 266 267 /* Ignore these return values. We rely on pci code to 268 * reject requests the hardware can't implement, rather 269 * than coding the same thing. 270 */ 271 (void) pci_enable_wake (dev, PCI_D3hot, hcd->remote_wakeup); 272 (void) pci_enable_wake (dev, PCI_D3cold, hcd->remote_wakeup); 273 } else { 274 dev_dbg (&dev->dev, "PCI D3 suspend fail, %d\n", 275 retval); 276 (void) usb_hcd_pci_resume (dev); 277 } 278 279 } else { 280 dev_dbg (hcd->self.controller, "hcd state %d; not suspended\n", 281 hcd->state); 282 WARN_ON(1); 283 retval = -EINVAL; 284 } 285 286 done: 287 if (retval == 0) 288 dev->dev.power.power_state = PMSG_SUSPEND; 289 return retval; 290 } 291 EXPORT_SYMBOL (usb_hcd_pci_suspend); 292 293 /** 294 * usb_hcd_pci_resume - power management resume of a PCI-based HCD 295 * @dev: USB Host Controller being resumed 296 * 297 * Store this function in the HCD's struct pci_driver as resume(). 298 */ 299 int usb_hcd_pci_resume (struct pci_dev *dev) 300 { 301 struct usb_hcd *hcd; 302 int retval; 303 304 hcd = pci_get_drvdata(dev); 305 if (hcd->state != HC_STATE_SUSPENDED) { 306 dev_dbg (hcd->self.controller, 307 "can't resume, not suspended!\n"); 308 return 0; 309 } 310 311 /* NOTE: chip docs cover clean "real suspend" cases (what Linux 312 * calls "standby", "suspend to RAM", and so on). There are also 313 * dirty cases when swsusp fakes a suspend in "shutdown" mode. 314 */ 315 if (dev->current_state != PCI_D0) { 316 #ifdef DEBUG 317 int pci_pm; 318 u16 pmcr; 319 320 pci_pm = pci_find_capability(dev, PCI_CAP_ID_PM); 321 pci_read_config_word(dev, pci_pm + PCI_PM_CTRL, &pmcr); 322 pmcr &= PCI_PM_CTRL_STATE_MASK; 323 if (pmcr) { 324 /* Clean case: power to USB and to HC registers was 325 * maintained; remote wakeup is easy. 326 */ 327 dev_dbg(hcd->self.controller, "resume from PCI D%d\n", 328 pmcr); 329 } else { 330 /* Clean: HC lost Vcc power, D0 uninitialized 331 * + Vaux may have preserved port and transceiver 332 * state ... for remote wakeup from D3cold 333 * + or not; HCD must reinit + re-enumerate 334 * 335 * Dirty: D0 semi-initialized cases with swsusp 336 * + after BIOS init 337 * + after Linux init (HCD statically linked) 338 */ 339 dev_dbg(hcd->self.controller, 340 "PCI D0, from previous PCI D%d\n", 341 dev->current_state); 342 } 343 #endif 344 /* yes, ignore these results too... */ 345 (void) pci_enable_wake (dev, dev->current_state, 0); 346 (void) pci_enable_wake (dev, PCI_D3cold, 0); 347 } else { 348 /* Same basic cases: clean (powered/not), dirty */ 349 dev_dbg(hcd->self.controller, "PCI legacy resume\n"); 350 } 351 352 /* NOTE: the PCI API itself is asymmetric here. We don't need to 353 * pci_set_power_state(PCI_D0) since that's part of re-enabling; 354 * but that won't re-enable bus mastering. Yet pci_disable_device() 355 * explicitly disables bus mastering... 356 */ 357 retval = pci_enable_device (dev); 358 if (retval < 0) { 359 dev_err (hcd->self.controller, 360 "can't re-enable after resume, %d!\n", retval); 361 return retval; 362 } 363 pci_set_master (dev); 364 pci_restore_state (dev); 365 366 dev->dev.power.power_state = PMSG_ON; 367 368 hcd->saw_irq = 0; 369 370 if (hcd->driver->resume) { 371 retval = hcd->driver->resume(hcd); 372 if (retval) { 373 dev_err (hcd->self.controller, 374 "PCI post-resume error %d!\n", retval); 375 usb_hc_died (hcd); 376 } 377 } 378 379 return retval; 380 } 381 EXPORT_SYMBOL (usb_hcd_pci_resume); 382 383 #endif /* CONFIG_PM */ 384 385 386