drivers/gpu/drm/nouveau/nvkm/subdev/bios/base.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 "priv.h"
  25
  26 #include <subdev/bios.h>
  27 #include <subdev/bios/bmp.h>
  28 #include <subdev/bios/bit.h>
  29 #include <subdev/bios/image.h>
  30
  31 static bool
  32 nvbios_addr(struct nvkm_bios *bios, u32 *addr, u8 size)
  33 {
  34         u32 p = *addr;
  35
  36         if (*addr > bios->image0_size && bios->imaged_addr) {
  37                 *addr -= bios->image0_size;
  38                 *addr += bios->imaged_addr;
  39         }
  40
  41         if (unlikely(*addr + size >= bios->size)) {
  42                 nvkm_error(&bios->subdev, "OOB %d %08x %08x\n", size, p, *addr);
  43                 return false;
  44         }
  45
  46         return true;
  47 }
  48
  49 u8
  50 nvbios_rd08(struct nvkm_bios *bios, u32 addr)
  51 {
  52         if (likely(nvbios_addr(bios, &addr, 1)))
  53                 return bios->data[addr];
  54         return 0x00;
  55 }
  56
  57 u16
  58 nvbios_rd16(struct nvkm_bios *bios, u32 addr)
  59 {
  60         if (likely(nvbios_addr(bios, &addr, 2)))
  61                 return get_unaligned_le16(&bios->data[addr]);
  62         return 0x0000;
  63 }
  64
  65 u32
  66 nvbios_rd32(struct nvkm_bios *bios, u32 addr)
  67 {
  68         if (likely(nvbios_addr(bios, &addr, 4)))
  69                 return get_unaligned_le32(&bios->data[addr]);
  70         return 0x00000000;
  71 }
  72
  73 u8
  74 nvbios_checksum(const u8 *data, int size)
  75 {
  76         u8 sum = 0;
  77         while (size--)
  78                 sum += *data++;
  79         return sum;
  80 }
  81
  82 u16
  83 nvbios_findstr(const u8 *data, int size, const char *str, int len)
  84 {
  85         int i, j;
  86
  87         for (i = 0; i <= (size - len); i++) {
  88                 for (j = 0; j < len; j++)
  89                         if ((char)data[i + j] != str[j])
  90                                 break;
  91                 if (j == len)
  92                         return i;
  93         }
  94
  95         return 0;
  96 }
  97
  98 int
  99 nvbios_memcmp(struct nvkm_bios *bios, u32 addr, const char *str, u32 len)
 100 {
 101         unsigned char c1, c2;
 102
 103         while (len--) {
 104                 c1 = nvbios_rd08(bios, addr++);
 105                 c2 = *(str++);
 106                 if (c1 != c2)
 107                         return c1 - c2;
 108         }
 109         return 0;
 110 }
 111
 112 int
 113 nvbios_extend(struct nvkm_bios *bios, u32 length)
 114 {
 115         if (bios->size < length) {
 116                 u8 *prev = bios->data;
 117                 if (!(bios->data = kmalloc(length, GFP_KERNEL))) {
 118                         bios->data = prev;
 119                         return -ENOMEM;
 120                 }
 121                 memcpy(bios->data, prev, bios->size);
 122                 bios->size = length;
 123                 kfree(prev);
 124                 return 1;
 125         }
 126         return 0;
 127 }
 128
 129 static void *
 130 nvkm_bios_dtor(struct nvkm_subdev *subdev)
 131 {
 132         struct nvkm_bios *bios = nvkm_bios(subdev);
 133         kfree(bios->data);
 134         return bios;
 135 }
 136
 137 static const struct nvkm_subdev_func
 138 nvkm_bios = {
 139         .dtor = nvkm_bios_dtor,
 140 };
 141
 142 int
 143 nvkm_bios_new(struct nvkm_device *device, int index, struct nvkm_bios **pbios)
 144 {
 145         struct nvkm_bios *bios;
 146         struct nvbios_image image;
 147         struct bit_entry bit_i;
 148         int ret, idx = 0;
 149
 150         if (!(bios = *pbios = kzalloc(sizeof(*bios), GFP_KERNEL)))
 151                 return -ENOMEM;
 152         nvkm_subdev_ctor(&nvkm_bios, device, index, &bios->subdev);
 153
 154         ret = nvbios_shadow(bios);
 155         if (ret)
 156                 return ret;
 157
 158         /* Some tables have weird pointers that need adjustment before
 159          * they're dereferenced.  I'm not entirely sure why...
 160          */
 161         if (nvbios_image(bios, idx++, &image)) {
 162                 bios->image0_size = image.size;
 163                 while (nvbios_image(bios, idx++, &image)) {
 164                         if (image.type == 0xe0) {
 165                                 bios->imaged_addr = image.base;
 166                                 break;
 167                         }
 168                 }
 169         }
 170
 171         /* detect type of vbios we're dealing with */
 172         bios->bmp_offset = nvbios_findstr(bios->data, bios->size,
 173                                           "\xff\x7f""NV\0", 5);
 174         if (bios->bmp_offset) {
 175                 nvkm_debug(&bios->subdev, "BMP version %x.%x\n",
 176                            bmp_version(bios) >> 8,
 177                            bmp_version(bios) & 0xff);
 178         }
 179
 180         bios->bit_offset = nvbios_findstr(bios->data, bios->size,
 181                                           "\xff\xb8""BIT", 5);
 182         if (bios->bit_offset)
 183                 nvkm_debug(&bios->subdev, "BIT signature found\n");
 184
 185         /* determine the vbios version number */
 186         if (!bit_entry(bios, 'i', &bit_i) && bit_i.length >= 4) {
 187                 bios->version.major = nvbios_rd08(bios, bit_i.offset + 3);
 188                 bios->version.chip  = nvbios_rd08(bios, bit_i.offset + 2);
 189                 bios->version.minor = nvbios_rd08(bios, bit_i.offset + 1);
 190                 bios->version.micro = nvbios_rd08(bios, bit_i.offset + 0);
 191                 bios->version.patch = nvbios_rd08(bios, bit_i.offset + 4);
 192         } else
 193         if (bmp_version(bios)) {
 194                 bios->version.major = nvbios_rd08(bios, bios->bmp_offset + 13);
 195                 bios->version.chip  = nvbios_rd08(bios, bios->bmp_offset + 12);
 196                 bios->version.minor = nvbios_rd08(bios, bios->bmp_offset + 11);
 197                 bios->version.micro = nvbios_rd08(bios, bios->bmp_offset + 10);
 198         }
 199
 200         nvkm_info(&bios->subdev, "version %02x.%02x.%02x.%02x.%02x\n",
 201                   bios->version.major, bios->version.chip,
 202                   bios->version.minor, bios->version.micro, bios->version.patch);
 203         return 0;
 204 }