LXR linux/drivers/gpu/drm/nouveau/nvkm/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#include <subdev/bios.h>
  25#include <subdev/bios/gpio.h>
  26#include <subdev/bios/xpio.h>
  27
  28static u16
  29dcb_xpiod_table(struct nvkm_bios *bios, u8 *ver, u8 *hdr, u8 *cnt, u8 *len)
  30{
  31        u16 data = dcb_gpio_table(bios, ver, hdr, cnt, len);
  32        if (data && *ver >= 0x40 && *hdr >= 0x06) {
  33                u16 xpio = nvbios_rd16(bios, data + 0x04);
  34                if (xpio) {
  35                        *ver = nvbios_rd08(bios, data + 0x00);
  36                        *hdr = nvbios_rd08(bios, data + 0x01);
  37                        *cnt = nvbios_rd08(bios, data + 0x02);
  38                        *len = nvbios_rd08(bios, data + 0x03);
  39                        return xpio;
  40                }
  41        }
  42        return 0x0000;
  43}
  44
  45u16
  46dcb_xpio_table(struct nvkm_bios *bios, u8 idx,
  47               u8 *ver, u8 *hdr, u8 *cnt, u8 *len)
  48{
  49        u16 data = dcb_xpiod_table(bios, ver, hdr, cnt, len);
  50        if (data && idx < *cnt) {
  51                u16 xpio = nvbios_rd16(bios, data + *hdr + (idx * *len));
  52                if (xpio) {
  53                        *ver = nvbios_rd08(bios, data + 0x00);
  54                        *hdr = nvbios_rd08(bios, data + 0x01);
  55                        *cnt = nvbios_rd08(bios, data + 0x02);
  56                        *len = nvbios_rd08(bios, data + 0x03);
  57                        return xpio;
  58                }
  59        }
  60        return 0x0000;
  61}
  62
  63u16
  64dcb_xpio_parse(struct nvkm_bios *bios, u8 idx,
  65               u8 *ver, u8 *hdr, u8 *cnt, u8 *len, struct nvbios_xpio *info)
  66{
  67        u16 data = dcb_xpio_table(bios, idx, ver, hdr, cnt, len);
  68        if (data && *len >= 6) {
  69                info->type = nvbios_rd08(bios, data + 0x04);
  70                info->addr = nvbios_rd08(bios, data + 0x05);
  71                info->flags = nvbios_rd08(bios, data + 0x06);
  72        }
  73        return 0x0000;
  74}
  75