arch/tile/gxio/usb_host.c

   1 /*
   2  * Copyright 2012 Tilera Corporation. All Rights Reserved.
   3  *
   4  *   This program is free software; you can redistribute it and/or
   5  *   modify it under the terms of the GNU General Public License
   6  *   as published by the Free Software Foundation, version 2.
   7  *
   8  *   This program is distributed in the hope that it will be useful, but
   9  *   WITHOUT ANY WARRANTY; without even the implied warranty of
  10  *   MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or
  11  *   NON INFRINGEMENT.  See the GNU General Public License for
  12  *   more details.
  13  */
  14
  15 /*
  16  *
  17  * Implementation of USB gxio calls.
  18  */
  19
  20 #include <linux/io.h>
  21 #include <linux/errno.h>
  22 #include <linux/module.h>
  23
  24 #include <gxio/iorpc_globals.h>
  25 #include <gxio/iorpc_usb_host.h>
  26 #include <gxio/kiorpc.h>
  27 #include <gxio/usb_host.h>
  28
  29 int gxio_usb_host_init(gxio_usb_host_context_t *context, int usb_index,
  30                        int is_ehci)
  31 {
  32         char file[32];
  33         int fd;
  34
  35         if (is_ehci)
  36                 snprintf(file, sizeof(file), "usb_host/%d/iorpc/ehci",
  37                          usb_index);
  38         else
  39                 snprintf(file, sizeof(file), "usb_host/%d/iorpc/ohci",
  40                          usb_index);
  41
  42         fd = hv_dev_open((HV_VirtAddr) file, 0);
  43         if (fd < 0) {
  44                 if (fd >= GXIO_ERR_MIN && fd <= GXIO_ERR_MAX)
  45                         return fd;
  46                 else
  47                         return -ENODEV;
  48         }
  49
  50         context->fd = fd;
  51
  52         // Map in the MMIO space.
  53         context->mmio_base =
  54                 (void __force *)iorpc_ioremap(fd, 0, HV_USB_HOST_MMIO_SIZE);
  55
  56         if (context->mmio_base == NULL) {
  57                 hv_dev_close(context->fd);
  58                 return -ENODEV;
  59         }
  60
  61         return 0;
  62 }
  63
  64 EXPORT_SYMBOL_GPL(gxio_usb_host_init);
  65
  66 int gxio_usb_host_destroy(gxio_usb_host_context_t *context)
  67 {
  68         iounmap((void __force __iomem *)(context->mmio_base));
  69         hv_dev_close(context->fd);
  70
  71         context->mmio_base = NULL;
  72         context->fd = -1;
  73
  74         return 0;
  75 }
  76
  77 EXPORT_SYMBOL_GPL(gxio_usb_host_destroy);
  78
  79 void *gxio_usb_host_get_reg_start(gxio_usb_host_context_t *context)
  80 {
  81         return context->mmio_base;
  82 }
  83
  84 EXPORT_SYMBOL_GPL(gxio_usb_host_get_reg_start);
  85
  86 size_t gxio_usb_host_get_reg_len(gxio_usb_host_context_t *context)
  87 {
  88         return HV_USB_HOST_MMIO_SIZE;
  89 }
  90
  91 EXPORT_SYMBOL_GPL(gxio_usb_host_get_reg_len);