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 int 87 nvkm_bios_ctor(struct nvkm_object *parent, struct nvkm_object *engine, 88 struct nvkm_oclass *oclass, void *data, u32 size, 89 struct nvkm_object **pobject) 90 { 91 struct nvkm_bios *bios; 92 struct bit_entry bit_i; 93 int ret; 94 95 ret = nvkm_subdev_create(parent, engine, oclass, 0, 96 "VBIOS", "bios", &bios); 97 *pobject = nv_object(bios); 98 if (ret) 99 return ret; 100 101 ret = nvbios_shadow(bios); 102 if (ret) 103 return ret; 104 105 /* detect type of vbios we're dealing with */ 106 bios->bmp_offset = nvbios_findstr(bios->data, bios->size, 107 "\xff\x7f""NV\0", 5); 108 if (bios->bmp_offset) { 109 nvkm_debug(&bios->subdev, "BMP version %x.%x\n", 110 bmp_version(bios) >> 8, 111 bmp_version(bios) & 0xff); 112 } 113 114 bios->bit_offset = nvbios_findstr(bios->data, bios->size, 115 "\xff\xb8""BIT", 5); 116 if (bios->bit_offset) 117 nvkm_debug(&bios->subdev, "BIT signature found\n"); 118 119 /* determine the vbios version number */ 120 if (!bit_entry(bios, 'i', &bit_i) && bit_i.length >= 4) { 121 bios->version.major = nvbios_rd08(bios, bit_i.offset + 3); 122 bios->version.chip = nvbios_rd08(bios, bit_i.offset + 2); 123 bios->version.minor = nvbios_rd08(bios, bit_i.offset + 1); 124 bios->version.micro = nvbios_rd08(bios, bit_i.offset + 0); 125 bios->version.patch = nvbios_rd08(bios, bit_i.offset + 4); 126 } else 127 if (bmp_version(bios)) { 128 bios->version.major = nvbios_rd08(bios, bios->bmp_offset + 13); 129 bios->version.chip = nvbios_rd08(bios, bios->bmp_offset + 12); 130 bios->version.minor = nvbios_rd08(bios, bios->bmp_offset + 11); 131 bios->version.micro = nvbios_rd08(bios, bios->bmp_offset + 10); 132 } 133 134 nvkm_info(&bios->subdev, "version %02x.%02x.%02x.%02x.%02x\n", 135 bios->version.major, bios->version.chip, 136 bios->version.minor, bios->version.micro, bios->version.patch); 137 return 0; 138 } 139 140 static void 141 nvkm_bios_dtor(struct nvkm_object *object) 142 { 143 struct nvkm_bios *bios = (void *)object; 144 kfree(bios->data); 145 nvkm_subdev_destroy(&bios->subdev); 146 } 147 148 static int 149 nvkm_bios_init(struct nvkm_object *object) 150 { 151 struct nvkm_bios *bios = (void *)object; 152 return nvkm_subdev_init(&bios->subdev); 153 } 154 155 static int 156 nvkm_bios_fini(struct nvkm_object *object, bool suspend) 157 { 158 struct nvkm_bios *bios = (void *)object; 159 return nvkm_subdev_fini(&bios->subdev, suspend); 160 } 161 162 struct nvkm_oclass 163 nvkm_bios_oclass = { 164 .handle = NV_SUBDEV(VBIOS, 0x00), 165 .ofuncs = &(struct nvkm_ofuncs) { 166 .ctor = nvkm_bios_ctor, 167 .dtor = nvkm_bios_dtor, 168 .init = nvkm_bios_init, 169 .fini = nvkm_bios_fini, 170 }, 171 }; 172