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 /* Device for a quirk */
  28 #define PCI_VENDOR_ID_FRESCO_LOGIC      0x1b73
  29 #define PCI_DEVICE_ID_FRESCO_LOGIC_PDK  0x1000
  30
  31 static const char hcd_name[] = "xhci_hcd";
  32
  33 /* called after powerup, by probe or system-pm "wakeup" */
  34 static int xhci_pci_reinit(struct xhci_hcd *xhci, struct pci_dev *pdev)
  35 {
  36         /*
  37          * TODO: Implement finding debug ports later.
  38          * TODO: see if there are any quirks that need to be added to handle
  39          * new extended capabilities.
  40          */
  41
  42         /* PCI Memory-Write-Invalidate cycle support is optional (uncommon) */
  43         if (!pci_set_mwi(pdev))
  44                 xhci_dbg(xhci, "MWI active\n");
  45
  46         xhci_dbg(xhci, "Finished xhci_pci_reinit\n");
  47         return 0;
  48 }
  49
  50 /* called during probe() after chip reset completes */
  51 static int xhci_pci_setup(struct usb_hcd *hcd)
  52 {
  53         struct xhci_hcd         *xhci = hcd_to_xhci(hcd);
  54         struct pci_dev          *pdev = to_pci_dev(hcd->self.controller);
  55         int                     retval;
  56
  57         hcd->self.sg_tablesize = TRBS_PER_SEGMENT - 2;
  58
  59         xhci->cap_regs = hcd->regs;
  60         xhci->op_regs = hcd->regs +
  61                 HC_LENGTH(xhci_readl(xhci, &xhci->cap_regs->hc_capbase));
  62         xhci->run_regs = hcd->regs +
  63                 (xhci_readl(xhci, &xhci->cap_regs->run_regs_off) & RTSOFF_MASK);
  64         /* Cache read-only capability registers */
  65         xhci->hcs_params1 = xhci_readl(xhci, &xhci->cap_regs->hcs_params1);
  66         xhci->hcs_params2 = xhci_readl(xhci, &xhci->cap_regs->hcs_params2);
  67         xhci->hcs_params3 = xhci_readl(xhci, &xhci->cap_regs->hcs_params3);
  68         xhci->hcc_params = xhci_readl(xhci, &xhci->cap_regs->hc_capbase);
  69         xhci->hci_version = HC_VERSION(xhci->hcc_params);
  70         xhci->hcc_params = xhci_readl(xhci, &xhci->cap_regs->hcc_params);
  71         xhci_print_registers(xhci);
  72
  73         /* Look for vendor-specific quirks */
  74         if (pdev->vendor == PCI_VENDOR_ID_FRESCO_LOGIC &&
  75                         pdev->device == PCI_DEVICE_ID_FRESCO_LOGIC_PDK &&
  76                         pdev->revision == 0x0) {
  77                         xhci->quirks |= XHCI_RESET_EP_QUIRK;
  78                         xhci_dbg(xhci, "QUIRK: Fresco Logic xHC needs configure"
  79                                         " endpoint cmd after reset endpoint\n");
  80         }
  81
  82         /* Make sure the HC is halted. */
  83         retval = xhci_halt(xhci);
  84         if (retval)
  85                 return retval;
  86
  87         xhci_dbg(xhci, "Resetting HCD\n");
  88         /* Reset the internal HC memory state and registers. */
  89         retval = xhci_reset(xhci);
  90         if (retval)
  91                 return retval;
  92         xhci_dbg(xhci, "Reset complete\n");
  93
  94         xhci_dbg(xhci, "Calling HCD init\n");
  95         /* Initialize HCD and host controller data structures. */
  96         retval = xhci_init(hcd);
  97         if (retval)
  98                 return retval;
  99         xhci_dbg(xhci, "Called HCD init\n");
 100
 101         pci_read_config_byte(pdev, XHCI_SBRN_OFFSET, &xhci->sbrn);
 102         xhci_dbg(xhci, "Got SBRN %u\n", (unsigned int) xhci->sbrn);
 103
 104         /* Find any debug ports */
 105         return xhci_pci_reinit(xhci, pdev);
 106 }
 107
 108 static const struct hc_driver xhci_pci_hc_driver = {
 109         .description =          hcd_name,
 110         .product_desc =         "xHCI Host Controller",
 111         .hcd_priv_size =        sizeof(struct xhci_hcd),
 112
 113         /*
 114          * generic hardware linkage
 115          */
 116         .irq =                  xhci_irq,
 117         .flags =                HCD_MEMORY | HCD_USB3,
 118
 119         /*
 120          * basic lifecycle operations
 121          */
 122         .reset =                xhci_pci_setup,
 123         .start =                xhci_run,
 124         /* suspend and resume implemented later */
 125         .stop =                 xhci_stop,
 126         .shutdown =             xhci_shutdown,
 127
 128         /*
 129          * managing i/o requests and associated device resources
 130          */
 131         .urb_enqueue =          xhci_urb_enqueue,
 132         .urb_dequeue =          xhci_urb_dequeue,
 133         .alloc_dev =            xhci_alloc_dev,
 134         .free_dev =             xhci_free_dev,
 135         .alloc_streams =        xhci_alloc_streams,
 136         .free_streams =         xhci_free_streams,
 137         .add_endpoint =         xhci_add_endpoint,
 138         .drop_endpoint =        xhci_drop_endpoint,
 139         .endpoint_reset =       xhci_endpoint_reset,
 140         .check_bandwidth =      xhci_check_bandwidth,
 141         .reset_bandwidth =      xhci_reset_bandwidth,
 142         .address_device =       xhci_address_device,
 143         .update_hub_device =    xhci_update_hub_device,
 144         .reset_device =         xhci_reset_device,
 145
 146         /*
 147          * scheduling support
 148          */
 149         .get_frame_number =     xhci_get_frame,
 150
 151         /* Root hub support */
 152         .hub_control =          xhci_hub_control,
 153         .hub_status_data =      xhci_hub_status_data,
 154 };
 155
 156 /*-------------------------------------------------------------------------*/
 157
 158 /* PCI driver selection metadata; PCI hotplugging uses this */
 159 static const struct pci_device_id pci_ids[] = { {
 160         /* handle any USB 3.0 xHCI controller */
 161         PCI_DEVICE_CLASS(PCI_CLASS_SERIAL_USB_XHCI, ~0),
 162         .driver_data =  (unsigned long) &xhci_pci_hc_driver,
 163         },
 164         { /* end: all zeroes */ }
 165 };
 166 MODULE_DEVICE_TABLE(pci, pci_ids);
 167
 168 /* pci driver glue; this is a "new style" PCI driver module */
 169 static struct pci_driver xhci_pci_driver = {
 170         .name =         (char *) hcd_name,
 171         .id_table =     pci_ids,
 172
 173         .probe =        usb_hcd_pci_probe,
 174         .remove =       usb_hcd_pci_remove,
 175         /* suspend and resume implemented later */
 176
 177         .shutdown =     usb_hcd_pci_shutdown,
 178 };
 179
 180 int xhci_register_pci(void)
 181 {
 182         return pci_register_driver(&xhci_pci_driver);
 183 }
 184
 185 void xhci_unregister_pci(void)
 186 {
 187         pci_unregister_driver(&xhci_pci_driver);
 188 }