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 #include "xhci-trace.h"
  29
  30 /* Device for a quirk */
  31 #define PCI_VENDOR_ID_FRESCO_LOGIC      0x1b73
  32 #define PCI_DEVICE_ID_FRESCO_LOGIC_PDK  0x1000
  33 #define PCI_DEVICE_ID_FRESCO_LOGIC_FL1400       0x1400
  34
  35 #define PCI_VENDOR_ID_ETRON             0x1b6f
  36 #define PCI_DEVICE_ID_EJ168             0x7023
  37
  38 #define PCI_DEVICE_ID_INTEL_LYNXPOINT_XHCI      0x8c31
  39 #define PCI_DEVICE_ID_INTEL_LYNXPOINT_LP_XHCI   0x9c31
  40 #define PCI_DEVICE_ID_INTEL_CHERRYVIEW_XHCI             0x22b5
  41 #define PCI_DEVICE_ID_INTEL_SUNRISEPOINT_H_XHCI         0xa12f
  42 #define PCI_DEVICE_ID_INTEL_SUNRISEPOINT_LP_XHCI        0x9d2f
  43
  44 static const char hcd_name[] = "xhci_hcd";
  45
  46 static struct hc_driver __read_mostly xhci_pci_hc_driver;
  47
  48 /* called after powerup, by probe or system-pm "wakeup" */
  49 static int xhci_pci_reinit(struct xhci_hcd *xhci, struct pci_dev *pdev)
  50 {
  51         /*
  52          * TODO: Implement finding debug ports later.
  53          * TODO: see if there are any quirks that need to be added to handle
  54          * new extended capabilities.
  55          */
  56
  57         /* PCI Memory-Write-Invalidate cycle support is optional (uncommon) */
  58         if (!pci_set_mwi(pdev))
  59                 xhci_dbg(xhci, "MWI active\n");
  60
  61         xhci_dbg(xhci, "Finished xhci_pci_reinit\n");
  62         return 0;
  63 }
  64
  65 static void xhci_pci_quirks(struct device *dev, struct xhci_hcd *xhci)
  66 {
  67         struct pci_dev          *pdev = to_pci_dev(dev);
  68
  69         /* Look for vendor-specific quirks */
  70         if (pdev->vendor == PCI_VENDOR_ID_FRESCO_LOGIC &&
  71                         (pdev->device == PCI_DEVICE_ID_FRESCO_LOGIC_PDK ||
  72                          pdev->device == PCI_DEVICE_ID_FRESCO_LOGIC_FL1400)) {
  73                 if (pdev->device == PCI_DEVICE_ID_FRESCO_LOGIC_PDK &&
  74                                 pdev->revision == 0x0) {
  75                         xhci->quirks |= XHCI_RESET_EP_QUIRK;
  76                         xhci_dbg_trace(xhci, trace_xhci_dbg_quirks,
  77                                 "QUIRK: Fresco Logic xHC needs configure"
  78                                 " endpoint cmd after reset endpoint");
  79                 }
  80                 if (pdev->device == PCI_DEVICE_ID_FRESCO_LOGIC_PDK &&
  81                                 pdev->revision == 0x4) {
  82                         xhci->quirks |= XHCI_SLOW_SUSPEND;
  83                         xhci_dbg_trace(xhci, trace_xhci_dbg_quirks,
  84                                 "QUIRK: Fresco Logic xHC revision %u"
  85                                 "must be suspended extra slowly",
  86                                 pdev->revision);
  87                 }
  88                 if (pdev->device == PCI_DEVICE_ID_FRESCO_LOGIC_PDK)
  89                         xhci->quirks |= XHCI_BROKEN_STREAMS;
  90                 /* Fresco Logic confirms: all revisions of this chip do not
  91                  * support MSI, even though some of them claim to in their PCI
  92                  * capabilities.
  93                  */
  94                 xhci->quirks |= XHCI_BROKEN_MSI;
  95                 xhci_dbg_trace(xhci, trace_xhci_dbg_quirks,
  96                                 "QUIRK: Fresco Logic revision %u "
  97                                 "has broken MSI implementation",
  98                                 pdev->revision);
  99                 xhci->quirks |= XHCI_TRUST_TX_LENGTH;
 100         }
 101
 102         if (pdev->vendor == PCI_VENDOR_ID_NEC)
 103                 xhci->quirks |= XHCI_NEC_HOST;
 104
 105         if (pdev->vendor == PCI_VENDOR_ID_AMD && xhci->hci_version == 0x96)
 106                 xhci->quirks |= XHCI_AMD_0x96_HOST;
 107
 108         /* AMD PLL quirk */
 109         if (pdev->vendor == PCI_VENDOR_ID_AMD && usb_amd_find_chipset_info())
 110                 xhci->quirks |= XHCI_AMD_PLL_FIX;
 111
 112         if (pdev->vendor == PCI_VENDOR_ID_AMD)
 113                 xhci->quirks |= XHCI_TRUST_TX_LENGTH;
 114
 115         if (pdev->vendor == PCI_VENDOR_ID_INTEL) {
 116                 xhci->quirks |= XHCI_LPM_SUPPORT;
 117                 xhci->quirks |= XHCI_INTEL_HOST;
 118         }
 119         if (pdev->vendor == PCI_VENDOR_ID_INTEL &&
 120                         pdev->device == PCI_DEVICE_ID_INTEL_PANTHERPOINT_XHCI) {
 121                 xhci->quirks |= XHCI_EP_LIMIT_QUIRK;
 122                 xhci->limit_active_eps = 64;
 123                 xhci->quirks |= XHCI_SW_BW_CHECKING;
 124                 /*
 125                  * PPT desktop boards DH77EB and DH77DF will power back on after
 126                  * a few seconds of being shutdown.  The fix for this is to
 127                  * switch the ports from xHCI to EHCI on shutdown.  We can't use
 128                  * DMI information to find those particular boards (since each
 129                  * vendor will change the board name), so we have to key off all
 130                  * PPT chipsets.
 131                  */
 132                 xhci->quirks |= XHCI_SPURIOUS_REBOOT;
 133                 xhci->quirks |= XHCI_AVOID_BEI;
 134         }
 135         if (pdev->vendor == PCI_VENDOR_ID_INTEL &&
 136                 pdev->device == PCI_DEVICE_ID_INTEL_LYNXPOINT_LP_XHCI) {
 137                 xhci->quirks |= XHCI_SPURIOUS_REBOOT;
 138         }
 139         if (pdev->vendor == PCI_VENDOR_ID_INTEL &&
 140                 (pdev->device == PCI_DEVICE_ID_INTEL_SUNRISEPOINT_LP_XHCI ||
 141                  pdev->device == PCI_DEVICE_ID_INTEL_SUNRISEPOINT_H_XHCI ||
 142                  pdev->device == PCI_DEVICE_ID_INTEL_CHERRYVIEW_XHCI)) {
 143                 xhci->quirks |= XHCI_PME_STUCK_QUIRK;
 144         }
 145         if (pdev->vendor == PCI_VENDOR_ID_ETRON &&
 146                         pdev->device == PCI_DEVICE_ID_EJ168) {
 147                 xhci->quirks |= XHCI_RESET_ON_RESUME;
 148                 xhci->quirks |= XHCI_TRUST_TX_LENGTH;
 149                 xhci->quirks |= XHCI_BROKEN_STREAMS;
 150         }
 151         if (pdev->vendor == PCI_VENDOR_ID_RENESAS &&
 152                         pdev->device == 0x0015)
 153                 xhci->quirks |= XHCI_RESET_ON_RESUME;
 154         if (pdev->vendor == PCI_VENDOR_ID_VIA)
 155                 xhci->quirks |= XHCI_RESET_ON_RESUME;
 156
 157         /* See https://bugzilla.kernel.org/show_bug.cgi?id=79511 */
 158         if (pdev->vendor == PCI_VENDOR_ID_VIA &&
 159                         pdev->device == 0x3432)
 160                 xhci->quirks |= XHCI_BROKEN_STREAMS;
 161
 162         if (pdev->vendor == PCI_VENDOR_ID_ASMEDIA &&
 163                         pdev->device == 0x1042)
 164                 xhci->quirks |= XHCI_BROKEN_STREAMS;
 165
 166         if (xhci->quirks & XHCI_RESET_ON_RESUME)
 167                 xhci_dbg_trace(xhci, trace_xhci_dbg_quirks,
 168                                 "QUIRK: Resetting on resume");
 169 }
 170
 171 /*
 172  * Make sure PME works on some Intel xHCI controllers by writing 1 to clear
 173  * the Internal PME flag bit in vendor specific PMCTRL register at offset 0x80a4
 174  */
 175 static void xhci_pme_quirk(struct xhci_hcd *xhci)
 176 {
 177         u32 val;
 178         void __iomem *reg;
 179
 180         reg = (void __iomem *) xhci->cap_regs + 0x80a4;
 181         val = readl(reg);
 182         writel(val | BIT(28), reg);
 183         readl(reg);
 184 }
 185
 186 /* called during probe() after chip reset completes */
 187 static int xhci_pci_setup(struct usb_hcd *hcd)
 188 {
 189         struct xhci_hcd         *xhci;
 190         struct pci_dev          *pdev = to_pci_dev(hcd->self.controller);
 191         int                     retval;
 192
 193         retval = xhci_gen_setup(hcd, xhci_pci_quirks);
 194         if (retval)
 195                 return retval;
 196
 197         xhci = hcd_to_xhci(hcd);
 198         if (!usb_hcd_is_primary_hcd(hcd))
 199                 return 0;
 200
 201         pci_read_config_byte(pdev, XHCI_SBRN_OFFSET, &xhci->sbrn);
 202         xhci_dbg(xhci, "Got SBRN %u\n", (unsigned int) xhci->sbrn);
 203
 204         /* Find any debug ports */
 205         retval = xhci_pci_reinit(xhci, pdev);
 206         if (!retval)
 207                 return retval;
 208
 209         kfree(xhci);
 210         return retval;
 211 }
 212
 213 /*
 214  * We need to register our own PCI probe function (instead of the USB core's
 215  * function) in order to create a second roothub under xHCI.
 216  */
 217 static int xhci_pci_probe(struct pci_dev *dev, const struct pci_device_id *id)
 218 {
 219         int retval;
 220         struct xhci_hcd *xhci;
 221         struct hc_driver *driver;
 222         struct usb_hcd *hcd;
 223
 224         driver = (struct hc_driver *)id->driver_data;
 225
 226         /* Prevent runtime suspending between USB-2 and USB-3 initialization */
 227         pm_runtime_get_noresume(&dev->dev);
 228
 229         /* Register the USB 2.0 roothub.
 230          * FIXME: USB core must know to register the USB 2.0 roothub first.
 231          * This is sort of silly, because we could just set the HCD driver flags
 232          * to say USB 2.0, but I'm not sure what the implications would be in
 233          * the other parts of the HCD code.
 234          */
 235         retval = usb_hcd_pci_probe(dev, id);
 236
 237         if (retval)
 238                 goto put_runtime_pm;
 239
 240         /* USB 2.0 roothub is stored in the PCI device now. */
 241         hcd = dev_get_drvdata(&dev->dev);
 242         xhci = hcd_to_xhci(hcd);
 243         xhci->shared_hcd = usb_create_shared_hcd(driver, &dev->dev,
 244                                 pci_name(dev), hcd);
 245         if (!xhci->shared_hcd) {
 246                 retval = -ENOMEM;
 247                 goto dealloc_usb2_hcd;
 248         }
 249
 250         /* Set the xHCI pointer before xhci_pci_setup() (aka hcd_driver.reset)
 251          * is called by usb_add_hcd().
 252          */
 253         *((struct xhci_hcd **) xhci->shared_hcd->hcd_priv) = xhci;
 254
 255         retval = usb_add_hcd(xhci->shared_hcd, dev->irq,
 256                         IRQF_SHARED);
 257         if (retval)
 258                 goto put_usb3_hcd;
 259         /* Roothub already marked as USB 3.0 speed */
 260
 261         if (!(xhci->quirks & XHCI_BROKEN_STREAMS) &&
 262                         HCC_MAX_PSA(xhci->hcc_params) >= 4)
 263                 xhci->shared_hcd->can_do_streams = 1;
 264
 265         /* USB-2 and USB-3 roothubs initialized, allow runtime pm suspend */
 266         pm_runtime_put_noidle(&dev->dev);
 267
 268         return 0;
 269
 270 put_usb3_hcd:
 271         usb_put_hcd(xhci->shared_hcd);
 272 dealloc_usb2_hcd:
 273         usb_hcd_pci_remove(dev);
 274 put_runtime_pm:
 275         pm_runtime_put_noidle(&dev->dev);
 276         return retval;
 277 }
 278
 279 static void xhci_pci_remove(struct pci_dev *dev)
 280 {
 281         struct xhci_hcd *xhci;
 282
 283         xhci = hcd_to_xhci(pci_get_drvdata(dev));
 284         if (xhci->shared_hcd) {
 285                 usb_remove_hcd(xhci->shared_hcd);
 286                 usb_put_hcd(xhci->shared_hcd);
 287         }
 288         usb_hcd_pci_remove(dev);
 289
 290         /* Workaround for spurious wakeups at shutdown with HSW */
 291         if (xhci->quirks & XHCI_SPURIOUS_WAKEUP)
 292                 pci_set_power_state(dev, PCI_D3hot);
 293
 294         kfree(xhci);
 295 }
 296
 297 #ifdef CONFIG_PM
 298 static int xhci_pci_suspend(struct usb_hcd *hcd, bool do_wakeup)
 299 {
 300         struct xhci_hcd *xhci = hcd_to_xhci(hcd);
 301         struct pci_dev          *pdev = to_pci_dev(hcd->self.controller);
 302
 303         /*
 304          * Systems with the TI redriver that loses port status change events
 305          * need to have the registers polled during D3, so avoid D3cold.
 306          */
 307         if (xhci->quirks & XHCI_COMP_MODE_QUIRK)
 308                 pdev->no_d3cold = true;
 309
 310         if (xhci->quirks & XHCI_PME_STUCK_QUIRK)
 311                 xhci_pme_quirk(xhci);
 312
 313         return xhci_suspend(xhci, do_wakeup);
 314 }
 315
 316 static int xhci_pci_resume(struct usb_hcd *hcd, bool hibernated)
 317 {
 318         struct xhci_hcd         *xhci = hcd_to_xhci(hcd);
 319         struct pci_dev          *pdev = to_pci_dev(hcd->self.controller);
 320         int                     retval = 0;
 321
 322         /* The BIOS on systems with the Intel Panther Point chipset may or may
 323          * not support xHCI natively.  That means that during system resume, it
 324          * may switch the ports back to EHCI so that users can use their
 325          * keyboard to select a kernel from GRUB after resume from hibernate.
 326          *
 327          * The BIOS is supposed to remember whether the OS had xHCI ports
 328          * enabled before resume, and switch the ports back to xHCI when the
 329          * BIOS/OS semaphore is written, but we all know we can't trust BIOS
 330          * writers.
 331          *
 332          * Unconditionally switch the ports back to xHCI after a system resume.
 333          * It should not matter whether the EHCI or xHCI controller is
 334          * resumed first. It's enough to do the switchover in xHCI because
 335          * USB core won't notice anything as the hub driver doesn't start
 336          * running again until after all the devices (including both EHCI and
 337          * xHCI host controllers) have been resumed.
 338          */
 339
 340         if (pdev->vendor == PCI_VENDOR_ID_INTEL)
 341                 usb_enable_intel_xhci_ports(pdev);
 342
 343         if (xhci->quirks & XHCI_PME_STUCK_QUIRK)
 344                 xhci_pme_quirk(xhci);
 345
 346         retval = xhci_resume(xhci, hibernated);
 347         return retval;
 348 }
 349 #endif /* CONFIG_PM */
 350
 351 /*-------------------------------------------------------------------------*/
 352
 353 /* PCI driver selection metadata; PCI hotplugging uses this */
 354 static const struct pci_device_id pci_ids[] = { {
 355         /* handle any USB 3.0 xHCI controller */
 356         PCI_DEVICE_CLASS(PCI_CLASS_SERIAL_USB_XHCI, ~0),
 357         .driver_data =  (unsigned long) &xhci_pci_hc_driver,
 358         },
 359         { /* end: all zeroes */ }
 360 };
 361 MODULE_DEVICE_TABLE(pci, pci_ids);
 362
 363 /* pci driver glue; this is a "new style" PCI driver module */
 364 static struct pci_driver xhci_pci_driver = {
 365         .name =         (char *) hcd_name,
 366         .id_table =     pci_ids,
 367
 368         .probe =        xhci_pci_probe,
 369         .remove =       xhci_pci_remove,
 370         /* suspend and resume implemented later */
 371
 372         .shutdown =     usb_hcd_pci_shutdown,
 373 #ifdef CONFIG_PM
 374         .driver = {
 375                 .pm = &usb_hcd_pci_pm_ops
 376         },
 377 #endif
 378 };
 379
 380 static int __init xhci_pci_init(void)
 381 {
 382         xhci_init_driver(&xhci_pci_hc_driver, xhci_pci_setup);
 383 #ifdef CONFIG_PM
 384         xhci_pci_hc_driver.pci_suspend = xhci_pci_suspend;
 385         xhci_pci_hc_driver.pci_resume = xhci_pci_resume;
 386 #endif
 387         return pci_register_driver(&xhci_pci_driver);
 388 }
 389 module_init(xhci_pci_init);
 390
 391 static void __exit xhci_pci_exit(void)
 392 {
 393         pci_unregister_driver(&xhci_pci_driver);
 394 }
 395 module_exit(xhci_pci_exit);
 396
 397 MODULE_DESCRIPTION("xHCI PCI Host Controller Driver");
 398 MODULE_LICENSE("GPL");