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
  30 u8
  31 nvbios_checksum(const u8 *data, int size)
  32 {
  33         u8 sum = 0;
  34         while (size--)
  35                 sum += *data++;
  36         return sum;
  37 }
  38
  39 u16
  40 nvbios_findstr(const u8 *data, int size, const char *str, int len)
  41 {
  42         int i, j;
  43
  44         for (i = 0; i <= (size - len); i++) {
  45                 for (j = 0; j < len; j++)
  46                         if ((char)data[i + j] != str[j])
  47                                 break;
  48                 if (j == len)
  49                         return i;
  50         }
  51
  52         return 0;
  53 }
  54
  55 int
  56 nvbios_memcmp(struct nvkm_bios *bios, u32 addr, const char *str, u32 len)
  57 {
  58         unsigned char c1, c2;
  59
  60         while (len--) {
  61                 c1 = nvbios_rd08(bios, addr++);
  62                 c2 = *(str++);
  63                 if (c1 != c2)
  64                         return c1 - c2;
  65         }
  66         return 0;
  67 }
  68
  69 int
  70 nvbios_extend(struct nvkm_bios *bios, u32 length)
  71 {
  72         if (bios->size < length) {
  73                 u8 *prev = bios->data;
  74                 if (!(bios->data = kmalloc(length, GFP_KERNEL))) {
  75                         bios->data = prev;
  76                         return -ENOMEM;
  77                 }
  78                 memcpy(bios->data, prev, bios->size);
  79                 bios->size = length;
  80                 kfree(prev);
  81                 return 1;
  82         }
  83         return 0;
  84 }
  85
  86 static void *
  87 nvkm_bios_dtor(struct nvkm_subdev *subdev)
  88 {
  89         struct nvkm_bios *bios = nvkm_bios(subdev);
  90         kfree(bios->data);
  91         return bios;
  92 }
  93
  94 static const struct nvkm_subdev_func
  95 nvkm_bios = {
  96         .dtor = nvkm_bios_dtor,
  97 };
  98
  99 int
 100 nvkm_bios_new(struct nvkm_device *device, int index, struct nvkm_bios **pbios)
 101 {
 102         struct nvkm_bios *bios;
 103         struct bit_entry bit_i;
 104         int ret;
 105
 106         if (!(bios = *pbios = kzalloc(sizeof(*bios), GFP_KERNEL)))
 107                 return -ENOMEM;
 108         nvkm_subdev_ctor(&nvkm_bios, device, index, &bios->subdev);
 109
 110         ret = nvbios_shadow(bios);
 111         if (ret)
 112                 return ret;
 113
 114         /* detect type of vbios we're dealing with */
 115         bios->bmp_offset = nvbios_findstr(bios->data, bios->size,
 116                                           "\xff\x7f""NV\0", 5);
 117         if (bios->bmp_offset) {
 118                 nvkm_debug(&bios->subdev, "BMP version %x.%x\n",
 119                            bmp_version(bios) >> 8,
 120                            bmp_version(bios) & 0xff);
 121         }
 122
 123         bios->bit_offset = nvbios_findstr(bios->data, bios->size,
 124                                           "\xff\xb8""BIT", 5);
 125         if (bios->bit_offset)
 126                 nvkm_debug(&bios->subdev, "BIT signature found\n");
 127
 128         /* determine the vbios version number */
 129         if (!bit_entry(bios, 'i', &bit_i) && bit_i.length >= 4) {
 130                 bios->version.major = nvbios_rd08(bios, bit_i.offset + 3);
 131                 bios->version.chip  = nvbios_rd08(bios, bit_i.offset + 2);
 132                 bios->version.minor = nvbios_rd08(bios, bit_i.offset + 1);
 133                 bios->version.micro = nvbios_rd08(bios, bit_i.offset + 0);
 134                 bios->version.patch = nvbios_rd08(bios, bit_i.offset + 4);
 135         } else
 136         if (bmp_version(bios)) {
 137                 bios->version.major = nvbios_rd08(bios, bios->bmp_offset + 13);
 138                 bios->version.chip  = nvbios_rd08(bios, bios->bmp_offset + 12);
 139                 bios->version.minor = nvbios_rd08(bios, bios->bmp_offset + 11);
 140                 bios->version.micro = nvbios_rd08(bios, bios->bmp_offset + 10);
 141         }
 142
 143         nvkm_info(&bios->subdev, "version %02x.%02x.%02x.%02x.%02x\n",
 144                   bios->version.major, bios->version.chip,
 145                   bios->version.minor, bios->version.micro, bios->version.patch);
 146         return 0;
 147 }