1 /* 2 * Copyright 2019 Advanced Micro Devices, 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 */ 23 #include <linux/pci.h> 24 25 #include "amdgpu.h" 26 #include "amdgpu_i2c.h" 27 #include "smu_v11_0_i2c.h" 28 #include "atom.h" 29 #include "amdgpu_fru_eeprom.h" 30 31 #define I2C_PRODUCT_INFO_ADDR 0xAC 32 #define I2C_PRODUCT_INFO_ADDR_SIZE 0x2 33 #define I2C_PRODUCT_INFO_OFFSET 0xC0 34 35 static bool is_fru_eeprom_supported(struct amdgpu_device *adev) 36 { 37 /* Only server cards have the FRU EEPROM 38 * TODO: See if we can figure this out dynamically instead of 39 * having to parse VBIOS versions. 40 */ 41 struct atom_context *atom_ctx = adev->mode_info.atom_context; 42 43 /* VBIOS is of the format ###-DXXXYY-##. For SKU identification, 44 * we can use just the "DXXX" portion. If there were more models, we 45 * could convert the 3 characters to a hex integer and use a switch 46 * for ease/speed/readability. For now, 2 string comparisons are 47 * reasonable and not too expensive 48 */ 49 switch (adev->asic_type) { 50 case CHIP_VEGA20: 51 /* D161 and D163 are the VG20 server SKUs */ 52 if (strnstr(atom_ctx->vbios_version, "D161", 53 sizeof(atom_ctx->vbios_version)) || 54 strnstr(atom_ctx->vbios_version, "D163", 55 sizeof(atom_ctx->vbios_version))) 56 return true; 57 else 58 return false; 59 default: 60 return false; 61 } 62 } 63 64 static int amdgpu_fru_read_eeprom(struct amdgpu_device *adev, uint32_t addrptr, 65 unsigned char *buff) 66 { 67 int ret, size; 68 struct i2c_msg msg = { 69 .addr = I2C_PRODUCT_INFO_ADDR, 70 .flags = I2C_M_RD, 71 .buf = buff, 72 }; 73 buff[0] = 0; 74 buff[1] = addrptr; 75 msg.len = I2C_PRODUCT_INFO_ADDR_SIZE + 1; 76 ret = i2c_transfer(&adev->pm.smu_i2c, &msg, 1); 77 78 if (ret < 1) { 79 DRM_WARN("FRU: Failed to get size field"); 80 return ret; 81 } 82 83 /* The size returned by the i2c requires subtraction of 0xC0 since the 84 * size apparently always reports as 0xC0+actual size. 85 */ 86 size = buff[2] - I2C_PRODUCT_INFO_OFFSET; 87 /* Add 1 since address field was 1 byte */ 88 buff[1] = addrptr + 1; 89 90 msg.len = I2C_PRODUCT_INFO_ADDR_SIZE + size; 91 ret = i2c_transfer(&adev->pm.smu_i2c, &msg, 1); 92 93 if (ret < 1) { 94 DRM_WARN("FRU: Failed to get data field"); 95 return ret; 96 } 97 98 return size; 99 } 100 101 int amdgpu_fru_get_product_info(struct amdgpu_device *adev) 102 { 103 unsigned char buff[34]; 104 int addrptr = 0, size = 0; 105 106 if (!is_fru_eeprom_supported(adev)) 107 return 0; 108 109 /* If algo exists, it means that the i2c_adapter's initialized */ 110 if (!adev->pm.smu_i2c.algo) { 111 DRM_WARN("Cannot access FRU, EEPROM accessor not initialized"); 112 return 0; 113 } 114 115 /* There's a lot of repetition here. This is due to the FRU having 116 * variable-length fields. To get the information, we have to find the 117 * size of each field, and then keep reading along and reading along 118 * until we get all of the data that we want. We use addrptr to track 119 * the address as we go 120 */ 121 122 /* The first fields are all of size 1-byte, from 0-7 are offsets that 123 * contain information that isn't useful to us. 124 * Bytes 8-a are all 1-byte and refer to the size of the entire struct, 125 * and the language field, so just start from 0xb, manufacturer size 126 */ 127 addrptr = 0xb; 128 size = amdgpu_fru_read_eeprom(adev, addrptr, buff); 129 if (size < 1) { 130 DRM_ERROR("Failed to read FRU Manufacturer, ret:%d", size); 131 return size; 132 } 133 134 /* Increment the addrptr by the size of the field, and 1 due to the 135 * size field being 1 byte. This pattern continues below. 136 */ 137 addrptr += size + 1; 138 size = amdgpu_fru_read_eeprom(adev, addrptr, buff); 139 if (size < 1) { 140 DRM_ERROR("Failed to read FRU product name, ret:%d", size); 141 return size; 142 } 143 144 /* Product name should only be 32 characters. Any more, 145 * and something could be wrong. Cap it at 32 to be safe 146 */ 147 if (size > 32) { 148 DRM_WARN("FRU Product Number is larger than 32 characters. This is likely a mistake"); 149 size = 32; 150 } 151 /* Start at 2 due to buff using fields 0 and 1 for the address */ 152 memcpy(adev->product_name, &buff[2], size); 153 adev->product_name[size] = '\0'; 154 155 addrptr += size + 1; 156 size = amdgpu_fru_read_eeprom(adev, addrptr, buff); 157 if (size < 1) { 158 DRM_ERROR("Failed to read FRU product number, ret:%d", size); 159 return size; 160 } 161 162 /* Product number should only be 16 characters. Any more, 163 * and something could be wrong. Cap it at 16 to be safe 164 */ 165 if (size > 16) { 166 DRM_WARN("FRU Product Number is larger than 16 characters. This is likely a mistake"); 167 size = 16; 168 } 169 memcpy(adev->product_number, &buff[2], size); 170 adev->product_number[size] = '\0'; 171 172 addrptr += size + 1; 173 size = amdgpu_fru_read_eeprom(adev, addrptr, buff); 174 175 if (size < 1) { 176 DRM_ERROR("Failed to read FRU product version, ret:%d", size); 177 return size; 178 } 179 180 addrptr += size + 1; 181 size = amdgpu_fru_read_eeprom(adev, addrptr, buff); 182 183 if (size < 1) { 184 DRM_ERROR("Failed to read FRU serial number, ret:%d", size); 185 return size; 186 } 187 188 /* Serial number should only be 16 characters. Any more, 189 * and something could be wrong. Cap it at 16 to be safe 190 */ 191 if (size > 16) { 192 DRM_WARN("FRU Serial Number is larger than 16 characters. This is likely a mistake"); 193 size = 16; 194 } 195 memcpy(adev->serial, &buff[2], size); 196 adev->serial[size] = '\0'; 197 198 return 0; 199 } 200