drivers/usb/host/xhci-pci.c

   1 /*
   2  * xHCI host controller driver PCI Bus Glue.
   3  *
   4  * Copyright (C) 2008 Intel Corp.
   5  *
   6  * Author: Sarah Sharp
   7  * Some code borrowed from the Linux EHCI driver.
   8  *
   9  * This program is free software; you can redistribute it and/or modify
  10  * it under the terms of the GNU General Public License version 2 as
  11  * published by the Free Software Foundation.
  12  *
  13  * This program is distributed in the hope that it will be useful, but
  14  * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
  15  * or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  16  * for more details.
  17  *
  18  * You should have received a copy of the GNU General Public License
  19  * along with this program; if not, write to the Free Software Foundation,
  20  * Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  21  */
  22
  23 #include <linux/pci.h>
  24 #include <linux/slab.h>
  25 #include <linux/module.h>
  26
  27 #include "xhci.h"
  28
  29 /* Device for a quirk */
  30 #define PCI_VENDOR_ID_FRESCO_LOGIC      0x1b73
  31 #define PCI_DEVICE_ID_FRESCO_LOGIC_PDK  0x1000
  32
  33 #define PCI_VENDOR_ID_ETRON             0x1b6f
  34 #define PCI_DEVICE_ID_ASROCK_P67        0x7023
  35
  36 static const char hcd_name[] = "xhci_hcd";
  37
  38 /* called after powerup, by probe or system-pm "wakeup" */
  39 static int xhci_pci_reinit(struct xhci_hcd *xhci, struct pci_dev *pdev)
  40 {
  41         /*
  42          * TODO: Implement finding debug ports later.
  43          * TODO: see if there are any quirks that need to be added to handle
  44          * new extended capabilities.
  45          */
  46
  47         /* PCI Memory-Write-Invalidate cycle support is optional (uncommon) */
  48         if (!pci_set_mwi(pdev))
  49                 xhci_dbg(xhci, "MWI active\n");
  50
  51         xhci_dbg(xhci, "Finished xhci_pci_reinit\n");
  52         return 0;
  53 }
  54
  55 static void xhci_pci_quirks(struct device *dev, struct xhci_hcd *xhci)
  56 {
  57         struct pci_dev          *pdev = to_pci_dev(dev);
  58
  59         /* Look for vendor-specific quirks */
  60         if (pdev->vendor == PCI_VENDOR_ID_FRESCO_LOGIC &&
  61                         pdev->device == PCI_DEVICE_ID_FRESCO_LOGIC_PDK) {
  62                 if (pdev->revision == 0x0) {
  63                         xhci->quirks |= XHCI_RESET_EP_QUIRK;
  64                         xhci_dbg(xhci, "QUIRK: Fresco Logic xHC needs configure"
  65                                         " endpoint cmd after reset endpoint\n");
  66                 }
  67                 /* Fresco Logic confirms: all revisions of this chip do not
  68                  * support MSI, even though some of them claim to in their PCI
  69                  * capabilities.
  70                  */
  71                 xhci->quirks |= XHCI_BROKEN_MSI;
  72                 xhci_dbg(xhci, "QUIRK: Fresco Logic revision %u "
  73                                 "has broken MSI implementation\n",
  74                                 pdev->revision);
  75         }
  76
  77         if (pdev->vendor == PCI_VENDOR_ID_NEC)
  78                 xhci->quirks |= XHCI_NEC_HOST;
  79
  80         if (pdev->vendor == PCI_VENDOR_ID_AMD && xhci->hci_version == 0x96)
  81                 xhci->quirks |= XHCI_AMD_0x96_HOST;
  82
  83         /* AMD PLL quirk */
  84         if (pdev->vendor == PCI_VENDOR_ID_AMD && usb_amd_find_chipset_info())
  85                 xhci->quirks |= XHCI_AMD_PLL_FIX;
  86         if (pdev->vendor == PCI_VENDOR_ID_INTEL &&
  87                         pdev->device == PCI_DEVICE_ID_INTEL_PANTHERPOINT_XHCI) {
  88                 xhci->quirks |= XHCI_SPURIOUS_SUCCESS;
  89                 xhci->quirks |= XHCI_EP_LIMIT_QUIRK;
  90                 xhci->limit_active_eps = 64;
  91                 xhci->quirks |= XHCI_SW_BW_CHECKING;
  92         }
  93         if (pdev->vendor == PCI_VENDOR_ID_ETRON &&
  94                         pdev->device == PCI_DEVICE_ID_ASROCK_P67) {
  95                 xhci->quirks |= XHCI_RESET_ON_RESUME;
  96                 xhci_dbg(xhci, "QUIRK: Resetting on resume\n");
  97         }
  98 }
  99
 100 /* called during probe() after chip reset completes */
 101 static int xhci_pci_setup(struct usb_hcd *hcd)
 102 {
 103         struct xhci_hcd         *xhci;
 104         struct pci_dev          *pdev = to_pci_dev(hcd->self.controller);
 105         int                     retval;
 106
 107         retval = xhci_gen_setup(hcd, xhci_pci_quirks);
 108         if (retval)
 109                 return retval;
 110
 111         xhci = hcd_to_xhci(hcd);
 112         if (!usb_hcd_is_primary_hcd(hcd))
 113                 return 0;
 114
 115         pci_read_config_byte(pdev, XHCI_SBRN_OFFSET, &xhci->sbrn);
 116         xhci_dbg(xhci, "Got SBRN %u\n", (unsigned int) xhci->sbrn);
 117
 118         /* Find any debug ports */
 119         retval = xhci_pci_reinit(xhci, pdev);
 120         if (!retval)
 121                 return retval;
 122
 123         kfree(xhci);
 124         return retval;
 125 }
 126
 127 /*
 128  * We need to register our own PCI probe function (instead of the USB core's
 129  * function) in order to create a second roothub under xHCI.
 130  */
 131 static int xhci_pci_probe(struct pci_dev *dev, const struct pci_device_id *id)
 132 {
 133         int retval;
 134         struct xhci_hcd *xhci;
 135         struct hc_driver *driver;
 136         struct usb_hcd *hcd;
 137
 138         driver = (struct hc_driver *)id->driver_data;
 139         /* Register the USB 2.0 roothub.
 140          * FIXME: USB core must know to register the USB 2.0 roothub first.
 141          * This is sort of silly, because we could just set the HCD driver flags
 142          * to say USB 2.0, but I'm not sure what the implications would be in
 143          * the other parts of the HCD code.
 144          */
 145         retval = usb_hcd_pci_probe(dev, id);
 146
 147         if (retval)
 148                 return retval;
 149
 150         /* USB 2.0 roothub is stored in the PCI device now. */
 151         hcd = dev_get_drvdata(&dev->dev);
 152         xhci = hcd_to_xhci(hcd);
 153         xhci->shared_hcd = usb_create_shared_hcd(driver, &dev->dev,
 154                                 pci_name(dev), hcd);
 155         if (!xhci->shared_hcd) {
 156                 retval = -ENOMEM;
 157                 goto dealloc_usb2_hcd;
 158         }
 159
 160         /* Set the xHCI pointer before xhci_pci_setup() (aka hcd_driver.reset)
 161          * is called by usb_add_hcd().
 162          */
 163         *((struct xhci_hcd **) xhci->shared_hcd->hcd_priv) = xhci;
 164
 165         retval = usb_add_hcd(xhci->shared_hcd, dev->irq,
 166                         IRQF_SHARED);
 167         if (retval)
 168                 goto put_usb3_hcd;
 169         /* Roothub already marked as USB 3.0 speed */
 170         return 0;
 171
 172 put_usb3_hcd:
 173         usb_put_hcd(xhci->shared_hcd);
 174 dealloc_usb2_hcd:
 175         usb_hcd_pci_remove(dev);
 176         return retval;
 177 }
 178
 179 static void xhci_pci_remove(struct pci_dev *dev)
 180 {
 181         struct xhci_hcd *xhci;
 182
 183         xhci = hcd_to_xhci(pci_get_drvdata(dev));
 184         if (xhci->shared_hcd) {
 185                 usb_remove_hcd(xhci->shared_hcd);
 186                 usb_put_hcd(xhci->shared_hcd);
 187         }
 188         usb_hcd_pci_remove(dev);
 189         kfree(xhci);
 190 }
 191
 192 #ifdef CONFIG_PM
 193 static int xhci_pci_suspend(struct usb_hcd *hcd, bool do_wakeup)
 194 {
 195         struct xhci_hcd *xhci = hcd_to_xhci(hcd);
 196         int     retval = 0;
 197
 198         if (hcd->state != HC_STATE_SUSPENDED ||
 199                         xhci->shared_hcd->state != HC_STATE_SUSPENDED)
 200                 return -EINVAL;
 201
 202         retval = xhci_suspend(xhci);
 203
 204         return retval;
 205 }
 206
 207 static int xhci_pci_resume(struct usb_hcd *hcd, bool hibernated)
 208 {
 209         struct xhci_hcd         *xhci = hcd_to_xhci(hcd);
 210         struct pci_dev          *pdev = to_pci_dev(hcd->self.controller);
 211         int                     retval = 0;
 212
 213         /* The BIOS on systems with the Intel Panther Point chipset may or may
 214          * not support xHCI natively.  That means that during system resume, it
 215          * may switch the ports back to EHCI so that users can use their
 216          * keyboard to select a kernel from GRUB after resume from hibernate.
 217          *
 218          * The BIOS is supposed to remember whether the OS had xHCI ports
 219          * enabled before resume, and switch the ports back to xHCI when the
 220          * BIOS/OS semaphore is written, but we all know we can't trust BIOS
 221          * writers.
 222          *
 223          * Unconditionally switch the ports back to xHCI after a system resume.
 224          * We can't tell whether the EHCI or xHCI controller will be resumed
 225          * first, so we have to do the port switchover in both drivers.  Writing
 226          * a '1' to the port switchover registers should have no effect if the
 227          * port was already switched over.
 228          */
 229         if (usb_is_intel_switchable_xhci(pdev))
 230                 usb_enable_xhci_ports(pdev);
 231
 232         retval = xhci_resume(xhci, hibernated);
 233         return retval;
 234 }
 235 #endif /* CONFIG_PM */
 236
 237 static const struct hc_driver xhci_pci_hc_driver = {
 238         .description =          hcd_name,
 239         .product_desc =         "xHCI Host Controller",
 240         .hcd_priv_size =        sizeof(struct xhci_hcd *),
 241
 242         /*
 243          * generic hardware linkage
 244          */
 245         .irq =                  xhci_irq,
 246         .flags =                HCD_MEMORY | HCD_USB3 | HCD_SHARED,
 247
 248         /*
 249          * basic lifecycle operations
 250          */
 251         .reset =                xhci_pci_setup,
 252         .start =                xhci_run,
 253 #ifdef CONFIG_PM
 254         .pci_suspend =          xhci_pci_suspend,
 255         .pci_resume =           xhci_pci_resume,
 256 #endif
 257         .stop =                 xhci_stop,
 258         .shutdown =             xhci_shutdown,
 259
 260         /*
 261          * managing i/o requests and associated device resources
 262          */
 263         .urb_enqueue =          xhci_urb_enqueue,
 264         .urb_dequeue =          xhci_urb_dequeue,
 265         .alloc_dev =            xhci_alloc_dev,
 266         .free_dev =             xhci_free_dev,
 267         .alloc_streams =        xhci_alloc_streams,
 268         .free_streams =         xhci_free_streams,
 269         .add_endpoint =         xhci_add_endpoint,
 270         .drop_endpoint =        xhci_drop_endpoint,
 271         .endpoint_reset =       xhci_endpoint_reset,
 272         .check_bandwidth =      xhci_check_bandwidth,
 273         .reset_bandwidth =      xhci_reset_bandwidth,
 274         .address_device =       xhci_address_device,
 275         .update_hub_device =    xhci_update_hub_device,
 276         .reset_device =         xhci_discover_or_reset_device,
 277
 278         /*
 279          * scheduling support
 280          */
 281         .get_frame_number =     xhci_get_frame,
 282
 283         /* Root hub support */
 284         .hub_control =          xhci_hub_control,
 285         .hub_status_data =      xhci_hub_status_data,
 286         .bus_suspend =          xhci_bus_suspend,
 287         .bus_resume =           xhci_bus_resume,
 288         /*
 289          * call back when device connected and addressed
 290          */
 291         .update_device =        xhci_update_device,
 292         .set_usb2_hw_lpm =      xhci_set_usb2_hardware_lpm,
 293 };
 294
 295 /*-------------------------------------------------------------------------*/
 296
 297 /* PCI driver selection metadata; PCI hotplugging uses this */
 298 static const struct pci_device_id pci_ids[] = { {
 299         /* handle any USB 3.0 xHCI controller */
 300         PCI_DEVICE_CLASS(PCI_CLASS_SERIAL_USB_XHCI, ~0),
 301         .driver_data =  (unsigned long) &xhci_pci_hc_driver,
 302         },
 303         { /* end: all zeroes */ }
 304 };
 305 MODULE_DEVICE_TABLE(pci, pci_ids);
 306
 307 /* pci driver glue; this is a "new style" PCI driver module */
 308 static struct pci_driver xhci_pci_driver = {
 309         .name =         (char *) hcd_name,
 310         .id_table =     pci_ids,
 311
 312         .probe =        xhci_pci_probe,
 313         .remove =       xhci_pci_remove,
 314         /* suspend and resume implemented later */
 315
 316         .shutdown =     usb_hcd_pci_shutdown,
 317 #ifdef CONFIG_PM_SLEEP
 318         .driver = {
 319                 .pm = &usb_hcd_pci_pm_ops
 320         },
 321 #endif
 322 };
 323
 324 int __init xhci_register_pci(void)
 325 {
 326         return pci_register_driver(&xhci_pci_driver);
 327 }
 328
 329 void __exit xhci_unregister_pci(void)
 330 {
 331         pci_unregister_driver(&xhci_pci_driver);
 332 }