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 #ifdef notyet 52 /* D161 and D163 are the VG20 server SKUs */ 53 if (strnstr(atom_ctx->vbios_version, "D161", 54 sizeof(atom_ctx->vbios_version)) || 55 strnstr(atom_ctx->vbios_version, "D163", 56 sizeof(atom_ctx->vbios_version))) 57 return true; 58 else 59 #endif 60 return false; 61 default: 62 return false; 63 } 64 } 65 66 static int amdgpu_fru_read_eeprom(struct amdgpu_device *adev, uint32_t addrptr, 67 unsigned char *buff) 68 { 69 int ret, size; 70 struct i2c_msg msg = { 71 .addr = I2C_PRODUCT_INFO_ADDR, 72 .flags = I2C_M_RD, 73 .buf = buff, 74 }; 75 buff[0] = 0; 76 buff[1] = addrptr; 77 msg.len = I2C_PRODUCT_INFO_ADDR_SIZE + 1; 78 ret = i2c_transfer(&adev->pm.smu_i2c, &msg, 1); 79 80 if (ret < 1) { 81 DRM_WARN("FRU: Failed to get size field"); 82 return ret; 83 } 84 85 /* The size returned by the i2c requires subtraction of 0xC0 since the 86 * size apparently always reports as 0xC0+actual size. 87 */ 88 size = buff[2] - I2C_PRODUCT_INFO_OFFSET; 89 /* Add 1 since address field was 1 byte */ 90 buff[1] = addrptr + 1; 91 92 msg.len = I2C_PRODUCT_INFO_ADDR_SIZE + size; 93 ret = i2c_transfer(&adev->pm.smu_i2c, &msg, 1); 94 95 if (ret < 1) { 96 DRM_WARN("FRU: Failed to get data field"); 97 return ret; 98 } 99 100 return size; 101 } 102 103 int amdgpu_fru_get_product_info(struct amdgpu_device *adev) 104 { 105 unsigned char buff[34]; 106 int addrptr, size; 107 int len; 108 109 if (!is_fru_eeprom_supported(adev)) 110 return 0; 111 112 /* If algo exists, it means that the i2c_adapter's initialized */ 113 if (!adev->pm.smu_i2c.algo) { 114 DRM_WARN("Cannot access FRU, EEPROM accessor not initialized"); 115 return -ENODEV; 116 } 117 118 /* There's a lot of repetition here. This is due to the FRU having 119 * variable-length fields. To get the information, we have to find the 120 * size of each field, and then keep reading along and reading along 121 * until we get all of the data that we want. We use addrptr to track 122 * the address as we go 123 */ 124 125 /* The first fields are all of size 1-byte, from 0-7 are offsets that 126 * contain information that isn't useful to us. 127 * Bytes 8-a are all 1-byte and refer to the size of the entire struct, 128 * and the language field, so just start from 0xb, manufacturer size 129 */ 130 addrptr = 0xb; 131 size = amdgpu_fru_read_eeprom(adev, addrptr, buff); 132 if (size < 1) { 133 DRM_ERROR("Failed to read FRU Manufacturer, ret:%d", size); 134 return -EINVAL; 135 } 136 137 /* Increment the addrptr by the size of the field, and 1 due to the 138 * size field being 1 byte. This pattern continues below. 139 */ 140 addrptr += size + 1; 141 size = amdgpu_fru_read_eeprom(adev, addrptr, buff); 142 if (size < 1) { 143 DRM_ERROR("Failed to read FRU product name, ret:%d", size); 144 return -EINVAL; 145 } 146 147 len = size; 148 /* Product name should only be 32 characters. Any more, 149 * and something could be wrong. Cap it at 32 to be safe 150 */ 151 if (len >= sizeof(adev->product_name)) { 152 DRM_WARN("FRU Product Number is larger than 32 characters. This is likely a mistake"); 153 len = sizeof(adev->product_name) - 1; 154 } 155 /* Start at 2 due to buff using fields 0 and 1 for the address */ 156 memcpy(adev->product_name, &buff[2], len); 157 adev->product_name[len] = '\0'; 158 159 addrptr += size + 1; 160 size = amdgpu_fru_read_eeprom(adev, addrptr, buff); 161 if (size < 1) { 162 DRM_ERROR("Failed to read FRU product number, ret:%d", size); 163 return -EINVAL; 164 } 165 166 len = size; 167 /* Product number should only be 16 characters. Any more, 168 * and something could be wrong. Cap it at 16 to be safe 169 */ 170 if (len >= sizeof(adev->product_number)) { 171 DRM_WARN("FRU Product Number is larger than 16 characters. This is likely a mistake"); 172 len = sizeof(adev->product_number) - 1; 173 } 174 memcpy(adev->product_number, &buff[2], len); 175 adev->product_number[len] = '\0'; 176 177 addrptr += size + 1; 178 size = amdgpu_fru_read_eeprom(adev, addrptr, buff); 179 180 if (size < 1) { 181 DRM_ERROR("Failed to read FRU product version, ret:%d", size); 182 return -EINVAL; 183 } 184 185 addrptr += size + 1; 186 size = amdgpu_fru_read_eeprom(adev, addrptr, buff); 187 188 if (size < 1) { 189 DRM_ERROR("Failed to read FRU serial number, ret:%d", size); 190 return -EINVAL; 191 } 192 193 len = size; 194 /* Serial number should only be 16 characters. Any more, 195 * and something could be wrong. Cap it at 16 to be safe 196 */ 197 if (len >= sizeof(adev->serial)) { 198 DRM_WARN("FRU Serial Number is larger than 16 characters. This is likely a mistake"); 199 len = sizeof(adev->serial) - 1; 200 } 201 memcpy(adev->serial, &buff[2], len); 202 adev->serial[len] = '\0'; 203 204 return 0; 205 } 206