LXR linux/drivers/gpu/drm/nouveau/nvkm/subdev/bios/M0203.c

   1/*
   2 * Copyright 2014 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/bit.h>
  26#include <subdev/bios/M0203.h>
  27
  28u32
  29nvbios_M0203Te(struct nvkm_bios *bios, u8 *ver, u8 *hdr, u8 *cnt, u8 *len)
  30{
  31        struct bit_entry bit_M;
  32        u32 data = 0x00000000;
  33
  34        if (!bit_entry(bios, 'M', &bit_M)) {
  35                if (bit_M.version == 2 && bit_M.length > 0x04)
  36                        data = nvbios_rd16(bios, bit_M.offset + 0x03);
  37                if (data) {
  38                        *ver = nvbios_rd08(bios, data + 0x00);
  39                        switch (*ver) {
  40                        case 0x10:
  41                                *hdr = nvbios_rd08(bios, data + 0x01);
  42                                *len = nvbios_rd08(bios, data + 0x02);
  43                                *cnt = nvbios_rd08(bios, data + 0x03);
  44                                return data;
  45                        default:
  46                                break;
  47                        }
  48                }
  49        }
  50
  51        return 0x00000000;
  52}
  53
  54u32
  55nvbios_M0203Tp(struct nvkm_bios *bios, u8 *ver, u8 *hdr, u8 *cnt, u8 *len,
  56               struct nvbios_M0203T *info)
  57{
  58        u32 data = nvbios_M0203Te(bios, ver, hdr, cnt, len);
  59        memset(info, 0x00, sizeof(*info));
  60        switch (!!data * *ver) {
  61        case 0x10:
  62                info->type    = nvbios_rd08(bios, data + 0x04);
  63                info->pointer = nvbios_rd16(bios, data + 0x05);
  64                break;
  65        default:
  66                break;
  67        }
  68        return data;
  69}
  70
  71u32
  72nvbios_M0203Ee(struct nvkm_bios *bios, int idx, u8 *ver, u8 *hdr)
  73{
  74        u8  cnt, len;
  75        u32 data = nvbios_M0203Te(bios, ver, hdr, &cnt, &len);
  76        if (data && idx < cnt) {
  77                data = data + *hdr + idx * len;
  78                *hdr = len;
  79                return data;
  80        }
  81        return 0x00000000;
  82}
  83
  84u32
  85nvbios_M0203Ep(struct nvkm_bios *bios, int idx, u8 *ver, u8 *hdr,
  86               struct nvbios_M0203E *info)
  87{
  88        u32 data = nvbios_M0203Ee(bios, idx, ver, hdr);
  89        memset(info, 0x00, sizeof(*info));
  90        switch (!!data * *ver) {
  91        case 0x10:
  92                info->type  = (nvbios_rd08(bios, data + 0x00) & 0x0f) >> 0;
  93                info->strap = (nvbios_rd08(bios, data + 0x00) & 0xf0) >> 4;
  94                info->group = (nvbios_rd08(bios, data + 0x01) & 0x0f) >> 0;
  95                return data;
  96        default:
  97                break;
  98        }
  99        return 0x00000000;
 100}
 101
 102u32
 103nvbios_M0203Em(struct nvkm_bios *bios, u8 ramcfg, u8 *ver, u8 *hdr,
 104               struct nvbios_M0203E *info)
 105{
 106        struct nvkm_subdev *subdev = &bios->subdev;
 107        struct nvbios_M0203T M0203T;
 108        u8  cnt, len, idx = 0xff;
 109        u32 data;
 110
 111        if (!nvbios_M0203Tp(bios, ver, hdr, &cnt, &len, &M0203T)) {
 112                nvkm_warn(subdev, "M0203T not found\n");
 113                return 0x00000000;
 114        }
 115
 116        while ((data = nvbios_M0203Ep(bios, ++idx, ver, hdr, info))) {
 117                switch (M0203T.type) {
 118                case M0203T_TYPE_RAMCFG:
 119                        if (info->strap != ramcfg)
 120                                continue;
 121                        return data;
 122                default:
 123                        nvkm_warn(subdev, "M0203T type %02x\n", M0203T.type);
 124                        return 0x00000000;
 125                }
 126        }
 127
 128        return data;
 129}
 130