drivers/usb/host/uhci-pci.c

   1 /*
   2  * UHCI HCD (Host Controller Driver) PCI Bus Glue.
   3  *
   4  * Extracted from uhci-hcd.c:
   5  * Maintainer: Alan Stern <stern@rowland.harvard.edu>
   6  *
   7  * (C) Copyright 1999 Linus Torvalds
   8  * (C) Copyright 1999-2002 Johannes Erdfelt, johannes@erdfelt.com
   9  * (C) Copyright 1999 Randy Dunlap
  10  * (C) Copyright 1999 Georg Acher, acher@in.tum.de
  11  * (C) Copyright 1999 Deti Fliegl, deti@fliegl.de
  12  * (C) Copyright 1999 Thomas Sailer, sailer@ife.ee.ethz.ch
  13  * (C) Copyright 1999 Roman Weissgaerber, weissg@vienna.at
  14  * (C) Copyright 2000 Yggdrasil Computing, Inc. (port of new PCI interface
  15  *               support from usb-ohci.c by Adam Richter, adam@yggdrasil.com).
  16  * (C) Copyright 1999 Gregory P. Smith (from usb-ohci.c)
  17  * (C) Copyright 2004-2007 Alan Stern, stern@rowland.harvard.edu
  18  */
  19
  20 #include "pci-quirks.h"
  21
  22 /*
  23  * Make sure the controller is completely inactive, unable to
  24  * generate interrupts or do DMA.
  25  */
  26 static void uhci_pci_reset_hc(struct uhci_hcd *uhci)
  27 {
  28         uhci_reset_hc(to_pci_dev(uhci_dev(uhci)), uhci->io_addr);
  29 }
  30
  31 /*
  32  * Initialize a controller that was newly discovered or has just been
  33  * resumed.  In either case we can't be sure of its previous state.
  34  *
  35  * Returns: 1 if the controller was reset, 0 otherwise.
  36  */
  37 static int uhci_pci_check_and_reset_hc(struct uhci_hcd *uhci)
  38 {
  39         return uhci_check_and_reset_hc(to_pci_dev(uhci_dev(uhci)),
  40                                 uhci->io_addr);
  41 }
  42
  43 /*
  44  * Store the basic register settings needed by the controller.
  45  * This function is called at the end of configure_hc in uhci-hcd.c.
  46  */
  47 static void uhci_pci_configure_hc(struct uhci_hcd *uhci)
  48 {
  49         struct pci_dev *pdev = to_pci_dev(uhci_dev(uhci));
  50
  51         /* Enable PIRQ */
  52         pci_write_config_word(pdev, USBLEGSUP, USBLEGSUP_DEFAULT);
  53
  54         /* Disable platform-specific non-PME# wakeup */
  55         if (pdev->vendor == PCI_VENDOR_ID_INTEL)
  56                 pci_write_config_byte(pdev, USBRES_INTEL, 0);
  57 }
  58
  59 static int uhci_pci_resume_detect_interrupts_are_broken(struct uhci_hcd *uhci)
  60 {
  61         int port;
  62
  63         switch (to_pci_dev(uhci_dev(uhci))->vendor) {
  64         default:
  65                 break;
  66
  67         case PCI_VENDOR_ID_GENESYS:
  68                 /* Genesys Logic's GL880S controllers don't generate
  69                  * resume-detect interrupts.
  70                  */
  71                 return 1;
  72
  73         case PCI_VENDOR_ID_INTEL:
  74                 /* Some of Intel's USB controllers have a bug that causes
  75                  * resume-detect interrupts if any port has an over-current
  76                  * condition.  To make matters worse, some motherboards
  77                  * hardwire unused USB ports' over-current inputs active!
  78                  * To prevent problems, we will not enable resume-detect
  79                  * interrupts if any ports are OC.
  80                  */
  81                 for (port = 0; port < uhci->rh_numports; ++port) {
  82                         if (inw(uhci->io_addr + USBPORTSC1 + port * 2) &
  83                                         USBPORTSC_OC)
  84                                 return 1;
  85                 }
  86                 break;
  87         }
  88         return 0;
  89 }
  90
  91 static int uhci_pci_global_suspend_mode_is_broken(struct uhci_hcd *uhci)
  92 {
  93         int port;
  94         const char *sys_info;
  95         static const char bad_Asus_board[] = "A7V8X";
  96
  97         /* One of Asus's motherboards has a bug which causes it to
  98          * wake up immediately from suspend-to-RAM if any of the ports
  99          * are connected.  In such cases we will not set EGSM.
 100          */
 101         sys_info = dmi_get_system_info(DMI_BOARD_NAME);
 102         if (sys_info && !strcmp(sys_info, bad_Asus_board)) {
 103                 for (port = 0; port < uhci->rh_numports; ++port) {
 104                         if (inw(uhci->io_addr + USBPORTSC1 + port * 2) &
 105                                         USBPORTSC_CCS)
 106                                 return 1;
 107                 }
 108         }
 109
 110         return 0;
 111 }
 112
 113 static int uhci_pci_init(struct usb_hcd *hcd)
 114 {
 115         struct uhci_hcd *uhci = hcd_to_uhci(hcd);
 116
 117         uhci->io_addr = (unsigned long) hcd->rsrc_start;
 118
 119         uhci->rh_numports = uhci_count_ports(hcd);
 120
 121         /* Intel controllers report the OverCurrent bit active on.
 122          * VIA controllers report it active off, so we'll adjust the
 123          * bit value.  (It's not standardized in the UHCI spec.)
 124          */
 125         if (to_pci_dev(uhci_dev(uhci))->vendor == PCI_VENDOR_ID_VIA)
 126                 uhci->oc_low = 1;
 127
 128         /* HP's server management chip requires a longer port reset delay. */
 129         if (to_pci_dev(uhci_dev(uhci))->vendor == PCI_VENDOR_ID_HP)
 130                 uhci->wait_for_hp = 1;
 131
 132         /* Set up pointers to PCI-specific functions */
 133         uhci->reset_hc = uhci_pci_reset_hc;
 134         uhci->check_and_reset_hc = uhci_pci_check_and_reset_hc;
 135         uhci->configure_hc = uhci_pci_configure_hc;
 136         uhci->resume_detect_interrupts_are_broken =
 137                 uhci_pci_resume_detect_interrupts_are_broken;
 138         uhci->global_suspend_mode_is_broken =
 139                 uhci_pci_global_suspend_mode_is_broken;
 140
 141
 142         /* Kick BIOS off this hardware and reset if the controller
 143          * isn't already safely quiescent.
 144          */
 145         check_and_reset_hc(uhci);
 146         return 0;
 147 }
 148
 149 /* Make sure the controller is quiescent and that we're not using it
 150  * any more.  This is mainly for the benefit of programs which, like kexec,
 151  * expect the hardware to be idle: not doing DMA or generating IRQs.
 152  *
 153  * This routine may be called in a damaged or failing kernel.  Hence we
 154  * do not acquire the spinlock before shutting down the controller.
 155  */
 156 static void uhci_shutdown(struct pci_dev *pdev)
 157 {
 158         struct usb_hcd *hcd = pci_get_drvdata(pdev);
 159
 160         uhci_hc_died(hcd_to_uhci(hcd));
 161 }
 162
 163 #ifdef CONFIG_PM
 164
 165 static int uhci_pci_suspend(struct usb_hcd *hcd, bool do_wakeup)
 166 {
 167         struct uhci_hcd *uhci = hcd_to_uhci(hcd);
 168         struct pci_dev *pdev = to_pci_dev(uhci_dev(uhci));
 169         int rc = 0;
 170
 171         dev_dbg(uhci_dev(uhci), "%s\n", __func__);
 172
 173         spin_lock_irq(&uhci->lock);
 174         if (!HCD_HW_ACCESSIBLE(hcd) || uhci->dead)
 175                 goto done_okay;         /* Already suspended or dead */
 176
 177         if (uhci->rh_state > UHCI_RH_SUSPENDED) {
 178                 dev_warn(uhci_dev(uhci), "Root hub isn't suspended!\n");
 179                 rc = -EBUSY;
 180                 goto done;
 181         };
 182
 183         /* All PCI host controllers are required to disable IRQ generation
 184          * at the source, so we must turn off PIRQ.
 185          */
 186         pci_write_config_word(pdev, USBLEGSUP, 0);
 187         clear_bit(HCD_FLAG_POLL_RH, &hcd->flags);
 188
 189         /* Enable platform-specific non-PME# wakeup */
 190         if (do_wakeup) {
 191                 if (pdev->vendor == PCI_VENDOR_ID_INTEL)
 192                         pci_write_config_byte(pdev, USBRES_INTEL,
 193                                         USBPORT1EN | USBPORT2EN);
 194         }
 195
 196 done_okay:
 197         clear_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags);
 198 done:
 199         spin_unlock_irq(&uhci->lock);
 200         return rc;
 201 }
 202
 203 static int uhci_pci_resume(struct usb_hcd *hcd, bool hibernated)
 204 {
 205         struct uhci_hcd *uhci = hcd_to_uhci(hcd);
 206
 207         dev_dbg(uhci_dev(uhci), "%s\n", __func__);
 208
 209         /* Since we aren't in D3 any more, it's safe to set this flag
 210          * even if the controller was dead.
 211          */
 212         set_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags);
 213
 214         spin_lock_irq(&uhci->lock);
 215
 216         /* Make sure resume from hibernation re-enumerates everything */
 217         if (hibernated) {
 218                 uhci->reset_hc(uhci);
 219                 finish_reset(uhci);
 220         }
 221
 222         /* The firmware may have changed the controller settings during
 223          * a system wakeup.  Check it and reconfigure to avoid problems.
 224          */
 225         else {
 226                 check_and_reset_hc(uhci);
 227         }
 228         configure_hc(uhci);
 229
 230         /* Tell the core if the controller had to be reset */
 231         if (uhci->rh_state == UHCI_RH_RESET)
 232                 usb_root_hub_lost_power(hcd->self.root_hub);
 233
 234         spin_unlock_irq(&uhci->lock);
 235
 236         /* If interrupts don't work and remote wakeup is enabled then
 237          * the suspended root hub needs to be polled.
 238          */
 239         if (!uhci->RD_enable && hcd->self.root_hub->do_remote_wakeup)
 240                 set_bit(HCD_FLAG_POLL_RH, &hcd->flags);
 241
 242         /* Does the root hub have a port wakeup pending? */
 243         usb_hcd_poll_rh_status(hcd);
 244         return 0;
 245 }
 246
 247 #endif
 248
 249 static const struct hc_driver uhci_driver = {
 250         .description =          hcd_name,
 251         .product_desc =         "UHCI Host Controller",
 252         .hcd_priv_size =        sizeof(struct uhci_hcd),
 253
 254         /* Generic hardware linkage */
 255         .irq =                  uhci_irq,
 256         .flags =                HCD_USB11,
 257
 258         /* Basic lifecycle operations */
 259         .reset =                uhci_pci_init,
 260         .start =                uhci_start,
 261 #ifdef CONFIG_PM
 262         .pci_suspend =          uhci_pci_suspend,
 263         .pci_resume =           uhci_pci_resume,
 264         .bus_suspend =          uhci_rh_suspend,
 265         .bus_resume =           uhci_rh_resume,
 266 #endif
 267         .stop =                 uhci_stop,
 268
 269         .urb_enqueue =          uhci_urb_enqueue,
 270         .urb_dequeue =          uhci_urb_dequeue,
 271
 272         .endpoint_disable =     uhci_hcd_endpoint_disable,
 273         .get_frame_number =     uhci_hcd_get_frame_number,
 274
 275         .hub_status_data =      uhci_hub_status_data,
 276         .hub_control =          uhci_hub_control,
 277 };
 278
 279 static DEFINE_PCI_DEVICE_TABLE(uhci_pci_ids) = { {
 280         /* handle any USB UHCI controller */
 281         PCI_DEVICE_CLASS(PCI_CLASS_SERIAL_USB_UHCI, ~0),
 282         .driver_data =  (unsigned long) &uhci_driver,
 283         }, { /* end: all zeroes */ }
 284 };
 285
 286 MODULE_DEVICE_TABLE(pci, uhci_pci_ids);
 287
 288 static struct pci_driver uhci_pci_driver = {
 289         .name =         (char *)hcd_name,
 290         .id_table =     uhci_pci_ids,
 291
 292         .probe =        usb_hcd_pci_probe,
 293         .remove =       usb_hcd_pci_remove,
 294         .shutdown =     uhci_shutdown,
 295
 296 #ifdef CONFIG_PM_SLEEP
 297         .driver =       {
 298                 .pm =   &usb_hcd_pci_pm_ops
 299         },
 300 #endif
 301 };