drivers/usb/core/hcd-pci.c

   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 #include "hcd.h"
  34
  35
  36 /* PCI-based HCs are common, but plenty of non-PCI HCs are used too */
  37
  38
  39 /*-------------------------------------------------------------------------*/
  40
  41 /* configure so an HC device and id are always provided */
  42 /* always called with process context; sleeping is OK */
  43
  44 /**
  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()
  49  *
  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.
  53  *
  54  * Store this function in the HCD's struct pci_driver as probe().
  55  */
  56 int usb_hcd_pci_probe (struct pci_dev *dev, const struct pci_device_id *id)
  57 {
  58         struct hc_driver        *driver;
  59         struct usb_hcd          *hcd;
  60         int                     retval;
  61
  62         if (usb_disabled())
  63                 return -ENODEV;
  64
  65         if (!id || !(driver = (struct hc_driver *) id->driver_data))
  66                 return -EINVAL;
  67
  68         if (pci_enable_device (dev) < 0)
  69                 return -ENODEV;
  70         dev->current_state = PCI_D0;
  71         dev->dev.power.power_state = PMSG_ON;
  72
  73         if (!dev->irq) {
  74                 dev_err (&dev->dev,
  75                         "Found HC with no IRQ.  Check BIOS/PCI %s setup!\n",
  76                         pci_name(dev));
  77                 retval = -ENODEV;
  78                 goto err1;
  79         }
  80
  81         hcd = usb_create_hcd (driver, &dev->dev, pci_name(dev));
  82         if (!hcd) {
  83                 retval = -ENOMEM;
  84                 goto err1;
  85         }
  86
  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");
  93                         retval = -EBUSY;
  94                         goto err2;
  95                 }
  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");
  99                         retval = -EFAULT;
 100                         goto err3;
 101                 }
 102
 103         } else {                                // UHCI
 104                 int     region;
 105
 106                 for (region = 0; region < PCI_ROM_RESOURCE; region++) {
 107                         if (!(pci_resource_flags (dev, region) &
 108                                         IORESOURCE_IO))
 109                                 continue;
 110
 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))
 115                                 break;
 116                 }
 117                 if (region == PCI_ROM_RESOURCE) {
 118                         dev_dbg (&dev->dev, "no i/o regions available\n");
 119                         retval = -EBUSY;
 120                         goto err1;
 121                 }
 122         }
 123
 124         pci_set_master (dev);
 125
 126         retval = usb_add_hcd (hcd, dev->irq, SA_SHIRQ);
 127         if (retval != 0)
 128                 goto err4;
 129         return retval;
 130
 131  err4:
 132         if (driver->flags & HCD_MEMORY) {
 133                 iounmap (hcd->regs);
 134  err3:
 135                 release_mem_region (hcd->rsrc_start, hcd->rsrc_len);
 136         } else
 137                 release_region (hcd->rsrc_start, hcd->rsrc_len);
 138  err2:
 139         usb_put_hcd (hcd);
 140  err1:
 141         pci_disable_device (dev);
 142         dev_err (&dev->dev, "init %s fail, %d\n", pci_name(dev), retval);
 143         return retval;
 144 }
 145 EXPORT_SYMBOL (usb_hcd_pci_probe);
 146
 147
 148 /* may be called without controller electrically present */
 149 /* may be called with controller, bus, and devices active */
 150
 151 /**
 152  * usb_hcd_pci_remove - shutdown processing for PCI-based HCDs
 153  * @dev: USB Host Controller being removed
 154  * Context: !in_interrupt()
 155  *
 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.
 159  *
 160  * Store this function in the HCD's struct pci_driver as remove().
 161  */
 162 void usb_hcd_pci_remove (struct pci_dev *dev)
 163 {
 164         struct usb_hcd          *hcd;
 165
 166         hcd = pci_get_drvdata(dev);
 167         if (!hcd)
 168                 return;
 169
 170         usb_remove_hcd (hcd);
 171         if (hcd->driver->flags & HCD_MEMORY) {
 172                 iounmap (hcd->regs);
 173                 release_mem_region (hcd->rsrc_start, hcd->rsrc_len);
 174         } else {
 175                 release_region (hcd->rsrc_start, hcd->rsrc_len);
 176         }
 177         usb_put_hcd (hcd);
 178         pci_disable_device(dev);
 179 }
 180 EXPORT_SYMBOL (usb_hcd_pci_remove);
 181
 182
 183 #ifdef  CONFIG_PM
 184
 185 /**
 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
 189  *
 190  * Store this function in the HCD's struct pci_driver as suspend().
 191  */
 192 int usb_hcd_pci_suspend (struct pci_dev *dev, pm_message_t message)
 193 {
 194         struct usb_hcd          *hcd;
 195         int                     retval = 0;
 196         int                     has_pci_pm;
 197
 198         hcd = pci_get_drvdata(dev);
 199
 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.
 204          *
 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.)
 210          */
 211
 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.
 215          */
 216         has_pci_pm = pci_find_capability(dev, PCI_CAP_ID_PM);
 217
 218         switch (hcd->state) {
 219
 220         /* entry if root hub wasn't yet suspended ... from sysfs,
 221          * without autosuspend, or if USB_SUSPEND isn't configured.
 222          */
 223         case HC_STATE_RUNNING:
 224                 hcd->state = HC_STATE_QUIESCING;
 225                 retval = hcd->driver->suspend (hcd, message);
 226                 if (retval) {
 227                         dev_dbg (hcd->self.controller,
 228                                         "suspend fail, retval %d\n",
 229                                         retval);
 230                         break;
 231                 }
 232                 hcd->state = HC_STATE_SUSPENDED;
 233                 /* FALLTHROUGH */
 234
 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.
 238          *
 239          * FIXME only CONFIG_USB_SUSPEND guarantees hub_suspend() will
 240          * have been called, otherwise root hub timers still run ...
 241          */
 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);
 247                 }
 248
 249                 if (!has_pci_pm) {
 250                         dev_dbg (hcd->self.controller, "--> PCI D0/legacy\n");
 251                         break;
 252                 }
 253
 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).
 258                  */
 259                 retval = pci_set_power_state (dev, PCI_D3hot);
 260                 if (retval == 0) {
 261                         dev_dbg (hcd->self.controller, "--> PCI D3\n");
 262                         retval = pci_enable_wake (dev, PCI_D3hot, hcd->remote_wakeup);
 263                         if (retval)
 264                                 break;
 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",
 268                                         retval);
 269                         (void) usb_hcd_pci_resume (dev);
 270                         break;
 271                 }
 272                 break;
 273         default:
 274                 dev_dbg (hcd->self.controller, "hcd state %d; not suspended\n",
 275                         hcd->state);
 276                 WARN_ON(1);
 277                 retval = -EINVAL;
 278                 break;
 279         }
 280
 281         /* update power_state **ONLY** to make sysfs happier */
 282         if (retval == 0)
 283                 dev->dev.power.power_state = message;
 284         return retval;
 285 }
 286 EXPORT_SYMBOL (usb_hcd_pci_suspend);
 287
 288 /**
 289  * usb_hcd_pci_resume - power management resume of a PCI-based HCD
 290  * @dev: USB Host Controller being resumed
 291  *
 292  * Store this function in the HCD's struct pci_driver as resume().
 293  */
 294 int usb_hcd_pci_resume (struct pci_dev *dev)
 295 {
 296         struct usb_hcd          *hcd;
 297         int                     retval;
 298
 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");
 303                 return 0;
 304         }
 305
 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.
 309          */
 310         if (dev->current_state != PCI_D0) {
 311 #ifdef  DEBUG
 312                 int     pci_pm;
 313                 u16     pmcr;
 314
 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;
 318                 if (pmcr) {
 319                         /* Clean case:  power to USB and to HC registers was
 320                          * maintained; remote wakeup is easy.
 321                          */
 322                         dev_dbg(hcd->self.controller, "resume from PCI D%d\n",
 323                                         pmcr);
 324                 } else {
 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
 329                          *
 330                          * Dirty: D0 semi-initialized cases with swsusp
 331                          *   + after BIOS init
 332                          *   + after Linux init (HCD statically linked)
 333                          */
 334                         dev_dbg(hcd->self.controller,
 335                                 "PCI D0, from previous PCI D%d\n",
 336                                 dev->current_state);
 337                 }
 338 #endif
 339                 retval = pci_enable_wake (dev, dev->current_state, 0);
 340                 if (retval) {
 341                         dev_err(hcd->self.controller,
 342                                 "can't enable_wake to %d, %d!\n",
 343                                 dev->current_state, retval);
 344                         return retval;
 345                 }
 346                 retval = pci_enable_wake (dev, PCI_D3cold, 0);
 347                 if (retval) {
 348                         dev_err(hcd->self.controller,
 349                                 "can't enable_wake to %d, %d!\n",
 350                                 PCI_D3cold, retval);
 351                         return retval;
 352                 }
 353         } else {
 354                 /* Same basic cases: clean (powered/not), dirty */
 355                 dev_dbg(hcd->self.controller, "PCI legacy resume\n");
 356         }
 357
 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...
 362          */
 363         retval = pci_enable_device (dev);
 364         if (retval < 0) {
 365                 dev_err (hcd->self.controller,
 366                         "can't re-enable after resume, %d!\n", retval);
 367                 return retval;
 368         }
 369         pci_set_master (dev);
 370         pci_restore_state (dev);
 371
 372         dev->dev.power.power_state = PMSG_ON;
 373
 374         hcd->state = HC_STATE_RESUMING;
 375         hcd->saw_irq = 0;
 376
 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);
 381                 usb_hc_died (hcd);
 382         }
 383
 384         retval = pci_enable_device(dev);
 385         return retval;
 386 }
 387 EXPORT_SYMBOL (usb_hcd_pci_resume);
 388
 389 #endif  /* CONFIG_PM */
 390
 391