drivers/usb/host/ehci-pci.c

   1 /*-
   2  * Copyright (c) 2007-2008, Juniper Networks, Inc.
   3  * All rights reserved.
   4  *
   5  * This program is free software; you can redistribute it and/or
   6  * modify it under the terms of the GNU General Public License as
   7  * published by the Free Software Foundation version 2 of
   8  * the License.
   9  *
  10  * This program is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13  * GNU General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU General Public License
  16  * along with this program; if not, write to the Free Software
  17  * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
  18  * MA 02111-1307 USA
  19  */
  20
  21 #include <common.h>
  22 #include <errno.h>
  23 #include <pci.h>
  24 #include <usb.h>
  25
  26 #include "ehci.h"
  27
  28 #ifdef CONFIG_PCI_EHCI_DEVICE
  29 static struct pci_device_id ehci_pci_ids[] = {
  30         /* Please add supported PCI EHCI controller ids here */
  31         {0x1033, 0x00E0},       /* NEC */
  32         {0x10B9, 0x5239},       /* ULI1575 PCI EHCI module ids */
  33         {0x12D8, 0x400F},       /* Pericom */
  34         {0, 0}
  35 };
  36 #else
  37 static pci_dev_t ehci_find_class(int index)
  38 {
  39         int bus;
  40         int devnum;
  41         pci_dev_t bdf;
  42         uint32_t class;
  43
  44         for (bus = 0; bus <= pci_last_busno(); bus++) {
  45                 for (devnum = 0; devnum < PCI_MAX_PCI_DEVICES-1; devnum++) {
  46                         pci_read_config_dword(PCI_BDF(bus, devnum, 0),
  47                                               PCI_CLASS_REVISION, &class);
  48                         if (class >> 16 == 0xffff)
  49                                 continue;
  50
  51                         for (bdf = PCI_BDF(bus, devnum, 0);
  52                                         bdf <= PCI_BDF(bus, devnum,
  53                                                 PCI_MAX_PCI_FUNCTIONS - 1);
  54                                         bdf += PCI_BDF(0, 0, 1)) {
  55                                 pci_read_config_dword(bdf, PCI_CLASS_REVISION,
  56                                                       &class);
  57                                 class >>= 8;
  58                                 /*
  59                                  * Here be dragons! In case we have multiple
  60                                  * PCI EHCI controllers, this function will
  61                                  * be called multiple times as well. This
  62                                  * function will scan the PCI busses, always
  63                                  * starting from bus 0, device 0, function 0,
  64                                  * until it finds an USB controller. The USB
  65                                  * stack gives us an 'index' of a controller
  66                                  * that is currently being registered, which
  67                                  * is a number, starting from 0 and growing
  68                                  * in ascending order as controllers are added.
  69                                  * To avoid probing the same controller in tne
  70                                  * subsequent runs of this function, we will
  71                                  * skip 'index - 1' detected controllers and
  72                                  * report the index'th controller.
  73                                  */
  74                                 if (class != PCI_CLASS_SERIAL_USB_EHCI)
  75                                         continue;
  76                                 if (index) {
  77                                         index--;
  78                                         continue;
  79                                 }
  80                                 /* Return index'th controller. */
  81                                 return bdf;
  82                         }
  83                 }
  84         }
  85
  86         return -ENODEV;
  87 }
  88 #endif
  89
  90 /*
  91  * Create the appropriate control structures to manage
  92  * a new EHCI host controller.
  93  */
  94 int ehci_hcd_init(int index, enum usb_init_type init,
  95                 struct ehci_hccr **ret_hccr, struct ehci_hcor **ret_hcor)
  96 {
  97         pci_dev_t pdev;
  98         uint32_t cmd;
  99         struct ehci_hccr *hccr;
 100         struct ehci_hcor *hcor;
 101
 102 #ifdef CONFIG_PCI_EHCI_DEVICE
 103         pdev = pci_find_devices(ehci_pci_ids, CONFIG_PCI_EHCI_DEVICE);
 104 #else
 105         pdev = ehci_find_class(index);
 106 #endif
 107         if (pdev < 0) {
 108                 printf("EHCI host controller not found\n");
 109                 return -1;
 110         }
 111
 112         hccr = (struct ehci_hccr *)pci_map_bar(pdev,
 113                         PCI_BASE_ADDRESS_0, PCI_REGION_MEM);
 114         hcor = (struct ehci_hcor *)((uint32_t) hccr +
 115                         HC_LENGTH(ehci_readl(&hccr->cr_capbase)));
 116
 117         debug("EHCI-PCI init hccr 0x%x and hcor 0x%x hc_length %d\n",
 118                         (uint32_t)hccr, (uint32_t)hcor,
 119                         (uint32_t)HC_LENGTH(ehci_readl(&hccr->cr_capbase)));
 120
 121         *ret_hccr = hccr;
 122         *ret_hcor = hcor;
 123
 124         /* enable busmaster */
 125         pci_read_config_dword(pdev, PCI_COMMAND, &cmd);
 126         cmd |= PCI_COMMAND_MASTER;
 127         pci_write_config_dword(pdev, PCI_COMMAND, cmd);
 128         return 0;
 129 }
 130
 131 /*
 132  * Destroy the appropriate control structures corresponding
 133  * the the EHCI host controller.
 134  */
 135 int ehci_hcd_stop(int index)
 136 {
 137         return 0;
 138 }