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 #ifdef CONFIG_PCI_NAMES
 125         hcd->product_desc = dev->pretty_name;
 126 #endif
 127
 128         pci_set_master (dev);
 129
 130         retval = usb_add_hcd (hcd, dev->irq, SA_SHIRQ);
 131         if (retval != 0)
 132                 goto err4;
 133         return retval;
 134
 135  err4:
 136         if (driver->flags & HCD_MEMORY) {
 137                 iounmap (hcd->regs);
 138  err3:
 139                 release_mem_region (hcd->rsrc_start, hcd->rsrc_len);
 140         } else
 141                 release_region (hcd->rsrc_start, hcd->rsrc_len);
 142  err2:
 143         usb_put_hcd (hcd);
 144  err1:
 145         pci_disable_device (dev);
 146         dev_err (&dev->dev, "init %s fail, %d\n", pci_name(dev), retval);
 147         return retval;
 148 }
 149 EXPORT_SYMBOL (usb_hcd_pci_probe);
 150
 151
 152 /* may be called without controller electrically present */
 153 /* may be called with controller, bus, and devices active */
 154
 155 /**
 156  * usb_hcd_pci_remove - shutdown processing for PCI-based HCDs
 157  * @dev: USB Host Controller being removed
 158  * Context: !in_interrupt()
 159  *
 160  * Reverses the effect of usb_hcd_pci_probe(), first invoking
 161  * the HCD's stop() method.  It is always called from a thread
 162  * context, normally "rmmod", "apmd", or something similar.
 163  *
 164  * Store this function in the HCD's struct pci_driver as remove().
 165  */
 166 void usb_hcd_pci_remove (struct pci_dev *dev)
 167 {
 168         struct usb_hcd          *hcd;
 169
 170         hcd = pci_get_drvdata(dev);
 171         if (!hcd)
 172                 return;
 173
 174         usb_remove_hcd (hcd);
 175         if (hcd->driver->flags & HCD_MEMORY) {
 176                 iounmap (hcd->regs);
 177                 release_mem_region (hcd->rsrc_start, hcd->rsrc_len);
 178         } else {
 179                 release_region (hcd->rsrc_start, hcd->rsrc_len);
 180         }
 181         usb_put_hcd (hcd);
 182         pci_disable_device(dev);
 183 }
 184 EXPORT_SYMBOL (usb_hcd_pci_remove);
 185
 186
 187 #ifdef  CONFIG_PM
 188
 189 /**
 190  * usb_hcd_pci_suspend - power management suspend of a PCI-based HCD
 191  * @dev: USB Host Controller being suspended
 192  * @message: semantics in flux
 193  *
 194  * Store this function in the HCD's struct pci_driver as suspend().
 195  */
 196 int usb_hcd_pci_suspend (struct pci_dev *dev, pm_message_t message)
 197 {
 198         struct usb_hcd          *hcd;
 199         int                     retval = 0;
 200         int                     has_pci_pm;
 201
 202         hcd = pci_get_drvdata(dev);
 203
 204         /* FIXME until the generic PM interfaces change a lot more, this
 205          * can't use PCI D1 and D2 states.  For example, the confusion
 206          * between messages and states will need to vanish, and messages
 207          * will need to provide a target system state again.
 208          *
 209          * It'll be important to learn characteristics of the target state,
 210          * especially on embedded hardware where the HCD will often be in
 211          * charge of an external VBUS power supply and one or more clocks.
 212          * Some target system states will leave them active; others won't.
 213          * (With PCI, that's often handled by platform BIOS code.)
 214          */
 215
 216         /* even when the PCI layer rejects some of the PCI calls
 217          * below, HCs can try global suspend and reduce DMA traffic.
 218          * PM-sensitive HCDs may already have done this.
 219          */
 220         has_pci_pm = pci_find_capability(dev, PCI_CAP_ID_PM);
 221
 222         switch (hcd->state) {
 223
 224         /* entry if root hub wasn't yet suspended ... from sysfs,
 225          * without autosuspend, or if USB_SUSPEND isn't configured.
 226          */
 227         case HC_STATE_RUNNING:
 228                 hcd->state = HC_STATE_QUIESCING;
 229                 retval = hcd->driver->suspend (hcd, message);
 230                 if (retval) {
 231                         dev_dbg (hcd->self.controller,
 232                                         "suspend fail, retval %d\n",
 233                                         retval);
 234                         break;
 235                 }
 236                 hcd->state = HC_STATE_SUSPENDED;
 237                 /* FALLTHROUGH */
 238
 239         /* entry with CONFIG_USB_SUSPEND, or hcds that autosuspend: the
 240          * controller and/or root hub will already have been suspended,
 241          * but it won't be ready for a PCI resume call.
 242          *
 243          * FIXME only CONFIG_USB_SUSPEND guarantees hub_suspend() will
 244          * have been called, otherwise root hub timers still run ...
 245          */
 246         case HC_STATE_SUSPENDED:
 247                 /* no DMA or IRQs except when HC is active */
 248                 if (dev->current_state == PCI_D0) {
 249                         free_irq (hcd->irq, hcd);
 250                         pci_save_state (dev);
 251                         pci_disable_device (dev);
 252                 }
 253
 254                 if (!has_pci_pm) {
 255                         dev_dbg (hcd->self.controller, "--> PCI D0/legacy\n");
 256                         break;
 257                 }
 258
 259                 /* NOTE:  dev->current_state becomes nonzero only here, and
 260                  * only for devices that support PCI PM.  Also, exiting
 261                  * PCI_D3 (but not PCI_D1 or PCI_D2) is allowed to reset
 262                  * some device state (e.g. as part of clock reinit).
 263                  */
 264                 retval = pci_set_power_state (dev, PCI_D3hot);
 265                 if (retval == 0) {
 266                         dev_dbg (hcd->self.controller, "--> PCI D3\n");
 267                         pci_enable_wake (dev, PCI_D3hot, hcd->remote_wakeup);
 268                         pci_enable_wake (dev, PCI_D3cold, hcd->remote_wakeup);
 269                 } else if (retval < 0) {
 270                         dev_dbg (&dev->dev, "PCI D3 suspend fail, %d\n",
 271                                         retval);
 272                         (void) usb_hcd_pci_resume (dev);
 273                         break;
 274                 }
 275                 break;
 276         default:
 277                 dev_dbg (hcd->self.controller, "hcd state %d; not suspended\n",
 278                         hcd->state);
 279                 WARN_ON(1);
 280                 retval = -EINVAL;
 281                 break;
 282         }
 283
 284         /* update power_state **ONLY** to make sysfs happier */
 285         if (retval == 0)
 286                 dev->dev.power.power_state = message;
 287         return retval;
 288 }
 289 EXPORT_SYMBOL (usb_hcd_pci_suspend);
 290
 291 /**
 292  * usb_hcd_pci_resume - power management resume of a PCI-based HCD
 293  * @dev: USB Host Controller being resumed
 294  *
 295  * Store this function in the HCD's struct pci_driver as resume().
 296  */
 297 int usb_hcd_pci_resume (struct pci_dev *dev)
 298 {
 299         struct usb_hcd          *hcd;
 300         int                     retval;
 301
 302         hcd = pci_get_drvdata(dev);
 303         if (hcd->state != HC_STATE_SUSPENDED) {
 304                 dev_dbg (hcd->self.controller,
 305                                 "can't resume, not suspended!\n");
 306                 return 0;
 307         }
 308
 309         /* NOTE:  chip docs cover clean "real suspend" cases (what Linux
 310          * calls "standby", "suspend to RAM", and so on).  There are also
 311          * dirty cases when swsusp fakes a suspend in "shutdown" mode.
 312          */
 313         if (dev->current_state != PCI_D0) {
 314 #ifdef  DEBUG
 315                 int     pci_pm;
 316                 u16     pmcr;
 317
 318                 pci_pm = pci_find_capability(dev, PCI_CAP_ID_PM);
 319                 pci_read_config_word(dev, pci_pm + PCI_PM_CTRL, &pmcr);
 320                 pmcr &= PCI_PM_CTRL_STATE_MASK;
 321                 if (pmcr) {
 322                         /* Clean case:  power to USB and to HC registers was
 323                          * maintained; remote wakeup is easy.
 324                          */
 325                         dev_dbg(hcd->self.controller, "resume from PCI D%d\n",
 326                                         pmcr);
 327                 } else {
 328                         /* Clean:  HC lost Vcc power, D0 uninitialized
 329                          *   + Vaux may have preserved port and transceiver
 330                          *     state ... for remote wakeup from D3cold
 331                          *   + or not; HCD must reinit + re-enumerate
 332                          *
 333                          * Dirty: D0 semi-initialized cases with swsusp
 334                          *   + after BIOS init
 335                          *   + after Linux init (HCD statically linked)
 336                          */
 337                         dev_dbg(hcd->self.controller,
 338                                 "PCI D0, from previous PCI D%d\n",
 339                                 dev->current_state);
 340                 }
 341 #endif
 342                 pci_enable_wake (dev, dev->current_state, 0);
 343                 pci_enable_wake (dev, PCI_D3cold, 0);
 344         } else {
 345                 /* Same basic cases: clean (powered/not), dirty */
 346                 dev_dbg(hcd->self.controller, "PCI legacy resume\n");
 347         }
 348
 349         /* NOTE:  the PCI API itself is asymmetric here.  We don't need to
 350          * pci_set_power_state(PCI_D0) since that's part of re-enabling;
 351          * but that won't re-enable bus mastering.  Yet pci_disable_device()
 352          * explicitly disables bus mastering...
 353          */
 354         retval = pci_enable_device (dev);
 355         if (retval < 0) {
 356                 dev_err (hcd->self.controller,
 357                         "can't re-enable after resume, %d!\n", retval);
 358                 return retval;
 359         }
 360         pci_set_master (dev);
 361         pci_restore_state (dev);
 362
 363         dev->dev.power.power_state = PMSG_ON;
 364
 365         hcd->state = HC_STATE_RESUMING;
 366         hcd->saw_irq = 0;
 367         retval = request_irq (dev->irq, usb_hcd_irq, SA_SHIRQ,
 368                                 hcd->irq_descr, hcd);
 369         if (retval < 0) {
 370                 dev_err (hcd->self.controller,
 371                         "can't restore IRQ after resume!\n");
 372                 usb_hc_died (hcd);
 373                 return retval;
 374         }
 375
 376         retval = hcd->driver->resume (hcd);
 377         if (!HC_IS_RUNNING (hcd->state)) {
 378                 dev_dbg (hcd->self.controller,
 379                                 "resume fail, retval %d\n", retval);
 380                 usb_hc_died (hcd);
 381         }
 382
 383         return retval;
 384 }
 385 EXPORT_SYMBOL (usb_hcd_pci_resume);
 386
 387 #endif  /* CONFIG_PM */
 388
 389