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/dcb.h> 26 #include <subdev/bios/i2c.h> 27 28 u16 dcb_i2c_table(struct nvkm_bios * bios,u8 * ver,u8 * hdr,u8 * cnt,u8 * len)29 dcb_i2c_table(struct nvkm_bios *bios, u8 *ver, u8 *hdr, u8 *cnt, u8 *len) 30 { 31 u16 i2c = 0x0000; 32 u16 dcb = dcb_table(bios, ver, hdr, cnt, len); 33 if (dcb) { 34 if (*ver >= 0x15) 35 i2c = nvbios_rd16(bios, dcb + 2); 36 if (*ver >= 0x30) 37 i2c = nvbios_rd16(bios, dcb + 4); 38 } 39 40 if (i2c && *ver >= 0x42) { 41 nvkm_warn(&bios->subdev, "ccb %02x not supported\n", *ver); 42 return 0x0000; 43 } 44 45 if (i2c && *ver >= 0x30) { 46 *ver = nvbios_rd08(bios, i2c + 0); 47 *hdr = nvbios_rd08(bios, i2c + 1); 48 *cnt = nvbios_rd08(bios, i2c + 2); 49 *len = nvbios_rd08(bios, i2c + 3); 50 } else { 51 *ver = *ver; /* use DCB version */ 52 *hdr = 0; 53 *cnt = 16; 54 *len = 4; 55 } 56 57 return i2c; 58 } 59 60 u16 dcb_i2c_entry(struct nvkm_bios * bios,u8 idx,u8 * ver,u8 * len)61 dcb_i2c_entry(struct nvkm_bios *bios, u8 idx, u8 *ver, u8 *len) 62 { 63 u8 hdr, cnt; 64 u16 i2c = dcb_i2c_table(bios, ver, &hdr, &cnt, len); 65 if (i2c && idx < cnt) 66 return i2c + hdr + (idx * *len); 67 return 0x0000; 68 } 69 70 int dcb_i2c_parse(struct nvkm_bios * bios,u8 idx,struct dcb_i2c_entry * info)71 dcb_i2c_parse(struct nvkm_bios *bios, u8 idx, struct dcb_i2c_entry *info) 72 { 73 struct nvkm_subdev *subdev = &bios->subdev; 74 u8 ver, len; 75 u16 ent = dcb_i2c_entry(bios, idx, &ver, &len); 76 if (ent) { 77 if (ver >= 0x41) { 78 u32 ent_value = nvbios_rd32(bios, ent); 79 u8 i2c_port = (ent_value >> 0) & 0x1f; 80 u8 dpaux_port = (ent_value >> 5) & 0x1f; 81 /* value 0x1f means unused according to DCB 4.x spec */ 82 if (i2c_port == 0x1f && dpaux_port == 0x1f) 83 info->type = DCB_I2C_UNUSED; 84 else 85 info->type = DCB_I2C_PMGR; 86 } else 87 if (ver >= 0x30) { 88 info->type = nvbios_rd08(bios, ent + 0x03); 89 } else { 90 info->type = nvbios_rd08(bios, ent + 0x03) & 0x07; 91 if (info->type == 0x07) 92 info->type = DCB_I2C_UNUSED; 93 } 94 95 info->drive = DCB_I2C_UNUSED; 96 info->sense = DCB_I2C_UNUSED; 97 info->share = DCB_I2C_UNUSED; 98 info->auxch = DCB_I2C_UNUSED; 99 100 switch (info->type) { 101 case DCB_I2C_NV04_BIT: 102 info->drive = nvbios_rd08(bios, ent + 0); 103 info->sense = nvbios_rd08(bios, ent + 1); 104 return 0; 105 case DCB_I2C_NV4E_BIT: 106 info->drive = nvbios_rd08(bios, ent + 1); 107 return 0; 108 case DCB_I2C_NVIO_BIT: 109 info->drive = nvbios_rd08(bios, ent + 0) & 0x0f; 110 if (nvbios_rd08(bios, ent + 1) & 0x01) 111 info->share = nvbios_rd08(bios, ent + 1) >> 1; 112 return 0; 113 case DCB_I2C_NVIO_AUX: 114 info->auxch = nvbios_rd08(bios, ent + 0) & 0x0f; 115 if (nvbios_rd08(bios, ent + 1) & 0x01) 116 info->share = info->auxch; 117 return 0; 118 case DCB_I2C_PMGR: 119 info->drive = (nvbios_rd16(bios, ent + 0) & 0x01f) >> 0; 120 if (info->drive == 0x1f) 121 info->drive = DCB_I2C_UNUSED; 122 info->auxch = (nvbios_rd16(bios, ent + 0) & 0x3e0) >> 5; 123 if (info->auxch == 0x1f) 124 info->auxch = DCB_I2C_UNUSED; 125 info->share = info->auxch; 126 return 0; 127 case DCB_I2C_UNUSED: 128 return 0; 129 default: 130 nvkm_warn(subdev, "unknown i2c type %d\n", info->type); 131 info->type = DCB_I2C_UNUSED; 132 return 0; 133 } 134 } 135 136 if (bios->bmp_offset && idx < 2) { 137 /* BMP (from v4.0 has i2c info in the structure, it's in a 138 * fixed location on earlier VBIOS 139 */ 140 if (nvbios_rd08(bios, bios->bmp_offset + 5) < 4) 141 ent = 0x0048; 142 else 143 ent = 0x0036 + bios->bmp_offset; 144 145 if (idx == 0) { 146 info->drive = nvbios_rd08(bios, ent + 4); 147 if (!info->drive) info->drive = 0x3f; 148 info->sense = nvbios_rd08(bios, ent + 5); 149 if (!info->sense) info->sense = 0x3e; 150 } else 151 if (idx == 1) { 152 info->drive = nvbios_rd08(bios, ent + 6); 153 if (!info->drive) info->drive = 0x37; 154 info->sense = nvbios_rd08(bios, ent + 7); 155 if (!info->sense) info->sense = 0x36; 156 } 157 158 info->type = DCB_I2C_NV04_BIT; 159 info->share = DCB_I2C_UNUSED; 160 return 0; 161 } 162 163 return -ENOENT; 164 } 165