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
  25 #include "xhci.h"
  26
  27 static const char hcd_name[] = "xhci_hcd";
  28
  29 /* called after powerup, by probe or system-pm "wakeup" */
  30 static int xhci_pci_reinit(struct xhci_hcd *xhci, struct pci_dev *pdev)
  31 {
  32         /*
  33          * TODO: Implement finding debug ports later.
  34          * TODO: see if there are any quirks that need to be added to handle
  35          * new extended capabilities.
  36          */
  37
  38         /* PCI Memory-Write-Invalidate cycle support is optional (uncommon) */
  39         if (!pci_set_mwi(pdev))
  40                 xhci_dbg(xhci, "MWI active\n");
  41
  42         xhci_dbg(xhci, "Finished xhci_pci_reinit\n");
  43         return 0;
  44 }
  45
  46 /* called during probe() after chip reset completes */
  47 static int xhci_pci_setup(struct usb_hcd *hcd)
  48 {
  49         struct xhci_hcd         *xhci = hcd_to_xhci(hcd);
  50         struct pci_dev          *pdev = to_pci_dev(hcd->self.controller);
  51         int                     retval;
  52
  53         xhci->cap_regs = hcd->regs;
  54         xhci->op_regs = hcd->regs +
  55                 HC_LENGTH(xhci_readl(xhci, &xhci->cap_regs->hc_capbase));
  56         xhci->run_regs = hcd->regs +
  57                 (xhci_readl(xhci, &xhci->cap_regs->run_regs_off) & RTSOFF_MASK);
  58         /* Cache read-only capability registers */
  59         xhci->hcs_params1 = xhci_readl(xhci, &xhci->cap_regs->hcs_params1);
  60         xhci->hcs_params2 = xhci_readl(xhci, &xhci->cap_regs->hcs_params2);
  61         xhci->hcs_params3 = xhci_readl(xhci, &xhci->cap_regs->hcs_params3);
  62         xhci->hcc_params = xhci_readl(xhci, &xhci->cap_regs->hcc_params);
  63         xhci_print_registers(xhci);
  64
  65         /* Make sure the HC is halted. */
  66         retval = xhci_halt(xhci);
  67         if (retval)
  68                 return retval;
  69
  70         xhci_dbg(xhci, "Resetting HCD\n");
  71         /* Reset the internal HC memory state and registers. */
  72         retval = xhci_reset(xhci);
  73         if (retval)
  74                 return retval;
  75         xhci_dbg(xhci, "Reset complete\n");
  76
  77         xhci_dbg(xhci, "Calling HCD init\n");
  78         /* Initialize HCD and host controller data structures. */
  79         retval = xhci_init(hcd);
  80         if (retval)
  81                 return retval;
  82         xhci_dbg(xhci, "Called HCD init\n");
  83
  84         pci_read_config_byte(pdev, XHCI_SBRN_OFFSET, &xhci->sbrn);
  85         xhci_dbg(xhci, "Got SBRN %u\n", (unsigned int) xhci->sbrn);
  86
  87         /* Find any debug ports */
  88         return xhci_pci_reinit(xhci, pdev);
  89 }
  90
  91 static const struct hc_driver xhci_pci_hc_driver = {
  92         .description =          hcd_name,
  93         .product_desc =         "xHCI Host Controller",
  94         .hcd_priv_size =        sizeof(struct xhci_hcd),
  95
  96         /*
  97          * generic hardware linkage
  98          */
  99         .flags =                HCD_MEMORY | HCD_USB3,
 100
 101         /*
 102          * basic lifecycle operations
 103          */
 104         .reset =                xhci_pci_setup,
 105         .start =                xhci_run,
 106         /* suspend and resume implemented later */
 107         .stop =                 xhci_stop,
 108         .shutdown =             xhci_shutdown,
 109
 110         /*
 111          * scheduling support
 112          */
 113         .get_frame_number =     xhci_get_frame,
 114
 115         /* Implement root hub support later. */
 116 };
 117
 118 /*-------------------------------------------------------------------------*/
 119
 120 /* PCI driver selection metadata; PCI hotplugging uses this */
 121 static const struct pci_device_id pci_ids[] = { {
 122         /* handle any USB 3.0 xHCI controller */
 123         PCI_DEVICE_CLASS(PCI_CLASS_SERIAL_USB_XHCI, ~0),
 124         .driver_data =  (unsigned long) &xhci_pci_hc_driver,
 125         },
 126         { /* end: all zeroes */ }
 127 };
 128 MODULE_DEVICE_TABLE(pci, pci_ids);
 129
 130 /* pci driver glue; this is a "new style" PCI driver module */
 131 static struct pci_driver xhci_pci_driver = {
 132         .name =         (char *) hcd_name,
 133         .id_table =     pci_ids,
 134
 135         .probe =        usb_hcd_pci_probe,
 136         .remove =       usb_hcd_pci_remove,
 137         /* suspend and resume implemented later */
 138
 139         .shutdown =     usb_hcd_pci_shutdown,
 140 };
 141
 142 int xhci_register_pci()
 143 {
 144         return pci_register_driver(&xhci_pci_driver);
 145 }
 146
 147 void xhci_unregister_pci()
 148 {
 149         pci_unregister_driver(&xhci_pci_driver);
 150 }