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 28u16 29dcb_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 = nv_ro16(bios, dcb + 2); 36 if (*ver >= 0x30) 37 i2c = nv_ro16(bios, dcb + 4); 38 } 39 40 if (i2c && *ver >= 0x42) { 41 nv_warn(bios, "ccb %02x not supported\n", *ver); 42 return 0x0000; 43 } 44 45 if (i2c && *ver >= 0x30) { 46 *ver = nv_ro08(bios, i2c + 0); 47 *hdr = nv_ro08(bios, i2c + 1); 48 *cnt = nv_ro08(bios, i2c + 2); 49 *len = nv_ro08(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 60u16 61dcb_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 70int 71dcb_i2c_parse(struct nvkm_bios *bios, u8 idx, struct dcb_i2c_entry *info) 72{ 73 u8 ver, len; 74 u16 ent = dcb_i2c_entry(bios, idx, &ver, &len); 75 if (ent) { 76 if (ver >= 0x41) { 77 u32 ent_value = nv_ro32(bios, ent); 78 u8 i2c_port = (ent_value >> 27) & 0x1f; 79 u8 dpaux_port = (ent_value >> 22) & 0x1f; 80 /* value 0x1f means unused according to DCB 4.x spec */ 81 if (i2c_port == 0x1f && dpaux_port == 0x1f) 82 info->type = DCB_I2C_UNUSED; 83 else 84 info->type = DCB_I2C_PMGR; 85 } else 86 if (ver >= 0x30) { 87 info->type = nv_ro08(bios, ent + 0x03); 88 } else { 89 info->type = nv_ro08(bios, ent + 0x03) & 0x07; 90 if (info->type == 0x07) 91 info->type = DCB_I2C_UNUSED; 92 } 93 94 info->drive = DCB_I2C_UNUSED; 95 info->sense = DCB_I2C_UNUSED; 96 info->share = DCB_I2C_UNUSED; 97 info->auxch = DCB_I2C_UNUSED; 98 99 switch (info->type) { 100 case DCB_I2C_NV04_BIT: 101 info->drive = nv_ro08(bios, ent + 0); 102 info->sense = nv_ro08(bios, ent + 1); 103 return 0; 104 case DCB_I2C_NV4E_BIT: 105 info->drive = nv_ro08(bios, ent + 1); 106 return 0; 107 case DCB_I2C_NVIO_BIT: 108 info->drive = nv_ro08(bios, ent + 0) & 0x0f; 109 if (nv_ro08(bios, ent + 1) & 0x01) 110 info->share = nv_ro08(bios, ent + 1) >> 1; 111 return 0; 112 case DCB_I2C_NVIO_AUX: 113 info->auxch = nv_ro08(bios, ent + 0) & 0x0f; 114 if (nv_ro08(bios, ent + 1) & 0x01) 115 info->share = info->auxch; 116 return 0; 117 case DCB_I2C_PMGR: 118 info->drive = (nv_ro16(bios, ent + 0) & 0x01f) >> 0; 119 if (info->drive == 0x1f) 120 info->drive = DCB_I2C_UNUSED; 121 info->auxch = (nv_ro16(bios, ent + 0) & 0x3e0) >> 5; 122 if (info->auxch == 0x1f) 123 info->auxch = DCB_I2C_UNUSED; 124 info->share = info->auxch; 125 return 0; 126 case DCB_I2C_UNUSED: 127 return 0; 128 default: 129 nv_warn(bios, "unknown i2c type %d\n", info->type); 130 info->type = DCB_I2C_UNUSED; 131 return 0; 132 } 133 } 134 135 if (bios->bmp_offset && idx < 2) { 136 /* BMP (from v4.0 has i2c info in the structure, it's in a 137 * fixed location on earlier VBIOS 138 */ 139 if (nv_ro08(bios, bios->bmp_offset + 5) < 4) 140 ent = 0x0048; 141 else 142 ent = 0x0036 + bios->bmp_offset; 143 144 if (idx == 0) { 145 info->drive = nv_ro08(bios, ent + 4); 146 if (!info->drive) info->drive = 0x3f; 147 info->sense = nv_ro08(bios, ent + 5); 148 if (!info->sense) info->sense = 0x3e; 149 } else 150 if (idx == 1) { 151 info->drive = nv_ro08(bios, ent + 6); 152 if (!info->drive) info->drive = 0x37; 153 info->sense = nv_ro08(bios, ent + 7); 154 if (!info->sense) info->sense = 0x36; 155 } 156 157 info->type = DCB_I2C_NV04_BIT; 158 info->share = DCB_I2C_UNUSED; 159 return 0; 160 } 161 162 return -ENOENT; 163} 164