LXR linux/drivers/gpu/drm/nouveau/core/subdev/bios/xpio.c

   1/*
   2 * Copyright 2012 Red Hat Inc.
   3 *
   4 * Permission is hereby granted, free of charge, to any person obtaining a
   5 * copy of this software and associated documentation files (the "Software"),
   6 * to deal in the Software without restriction, including without limitation
   7 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
   8 * and/or sell copies of the Software, and to permit persons to whom the
   9 * Software is furnished to do so, subject to the following conditions:
  10 *
  11 * The above copyright notice and this permission notice shall be included in
  12 * all copies or substantial portions of the Software.
  13 *
  14 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  15 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  16 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  17 * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
  18 * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
  19 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
  20 * OTHER DEALINGS IN THE SOFTWARE.
  21 *
  22 * Authors: Ben Skeggs
  23 */
  24
  25#include <subdev/bios.h>
  26#include <subdev/bios/gpio.h>
  27#include <subdev/bios/xpio.h>
  28
  29static u16
  30dcb_xpiod_table(struct nouveau_bios *bios, u8 *ver, u8 *hdr, u8 *cnt, u8 *len)
  31{
  32        u16 data = dcb_gpio_table(bios, ver, hdr, cnt, len);
  33        if (data && *ver >= 0x40 && *hdr >= 0x06) {
  34                u16 xpio = nv_ro16(bios, data + 0x04);
  35                if (xpio) {
  36                        *ver = nv_ro08(bios, data + 0x00);
  37                        *hdr = nv_ro08(bios, data + 0x01);
  38                        *cnt = nv_ro08(bios, data + 0x02);
  39                        *len = nv_ro08(bios, data + 0x03);
  40                        return xpio;
  41                }
  42        }
  43        return 0x0000;
  44}
  45
  46u16
  47dcb_xpio_table(struct nouveau_bios *bios, u8 idx,
  48               u8 *ver, u8 *hdr, u8 *cnt, u8 *len)
  49{
  50        u16 data = dcb_xpiod_table(bios, ver, hdr, cnt, len);
  51        if (data && idx < *cnt) {
  52                u16 xpio = nv_ro16(bios, data + *hdr + (idx * *len));
  53                if (xpio) {
  54                        *ver = nv_ro08(bios, data + 0x00);
  55                        *hdr = nv_ro08(bios, data + 0x01);
  56                        *cnt = nv_ro08(bios, data + 0x02);
  57                        *len = nv_ro08(bios, data + 0x03);
  58                        return xpio;
  59                }
  60        }
  61        return 0x0000;
  62}
  63
  64u16
  65dcb_xpio_parse(struct nouveau_bios *bios, u8 idx,
  66               u8 *ver, u8 *hdr, u8 *cnt, u8 *len,
  67               struct nvbios_xpio *info)
  68{
  69        u16 data = dcb_xpio_table(bios, idx, ver, hdr, cnt, len);
  70        if (data && *len >= 6) {
  71                info->type = nv_ro08(bios, data + 0x04);
  72                info->addr = nv_ro08(bios, data + 0x05);
  73                info->flags = nv_ro08(bios, data + 0x06);
  74        }
  75        return 0x0000;
  76}
  77