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 #include "amdgpu_eeprom.h" 31 32 #define FRU_EEPROM_MADDR 0x60000 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 69 ret = amdgpu_eeprom_read(&adev->pm.smu_i2c, addrptr, buff, 1); 70 if (ret < 1) { 71 DRM_WARN("FRU: Failed to get size field"); 72 return ret; 73 } 74 75 /* The size returned by the i2c requires subtraction of 0xC0 since the 76 * size apparently always reports as 0xC0+actual size. 77 */ 78 size = buff[0] - I2C_PRODUCT_INFO_OFFSET; 79 80 ret = amdgpu_eeprom_read(&adev->pm.smu_i2c, addrptr + 1, buff, size); 81 if (ret < 1) { 82 DRM_WARN("FRU: Failed to get data field"); 83 return ret; 84 } 85 86 return size; 87 } 88 89 int amdgpu_fru_get_product_info(struct amdgpu_device *adev) 90 { 91 unsigned char buff[34]; 92 u32 addrptr; 93 int size, len; 94 95 if (!is_fru_eeprom_supported(adev)) 96 return 0; 97 98 /* If algo exists, it means that the i2c_adapter's initialized */ 99 if (!adev->pm.smu_i2c.algo) { 100 DRM_WARN("Cannot access FRU, EEPROM accessor not initialized"); 101 return -ENODEV; 102 } 103 104 /* There's a lot of repetition here. This is due to the FRU having 105 * variable-length fields. To get the information, we have to find the 106 * size of each field, and then keep reading along and reading along 107 * until we get all of the data that we want. We use addrptr to track 108 * the address as we go 109 */ 110 111 /* The first fields are all of size 1-byte, from 0-7 are offsets that 112 * contain information that isn't useful to us. 113 * Bytes 8-a are all 1-byte and refer to the size of the entire struct, 114 * and the language field, so just start from 0xb, manufacturer size 115 */ 116 addrptr = FRU_EEPROM_MADDR + 0xb; 117 size = amdgpu_fru_read_eeprom(adev, addrptr, buff); 118 if (size < 1) { 119 DRM_ERROR("Failed to read FRU Manufacturer, ret:%d", size); 120 return -EINVAL; 121 } 122 123 /* Increment the addrptr by the size of the field, and 1 due to the 124 * size field being 1 byte. This pattern continues below. 125 */ 126 addrptr += size + 1; 127 size = amdgpu_fru_read_eeprom(adev, addrptr, buff); 128 if (size < 1) { 129 DRM_ERROR("Failed to read FRU product name, ret:%d", size); 130 return -EINVAL; 131 } 132 133 len = size; 134 /* Product name should only be 32 characters. Any more, 135 * and something could be wrong. Cap it at 32 to be safe 136 */ 137 if (len >= sizeof(adev->product_name)) { 138 DRM_WARN("FRU Product Number is larger than 32 characters. This is likely a mistake"); 139 len = sizeof(adev->product_name) - 1; 140 } 141 /* Start at 2 due to buff using fields 0 and 1 for the address */ 142 memcpy(adev->product_name, &buff[2], len); 143 adev->product_name[len] = '\0'; 144 145 addrptr += size + 1; 146 size = amdgpu_fru_read_eeprom(adev, addrptr, buff); 147 if (size < 1) { 148 DRM_ERROR("Failed to read FRU product number, ret:%d", size); 149 return -EINVAL; 150 } 151 152 len = size; 153 /* Product number should only be 16 characters. Any more, 154 * and something could be wrong. Cap it at 16 to be safe 155 */ 156 if (len >= sizeof(adev->product_number)) { 157 DRM_WARN("FRU Product Number is larger than 16 characters. This is likely a mistake"); 158 len = sizeof(adev->product_number) - 1; 159 } 160 memcpy(adev->product_number, &buff[2], len); 161 adev->product_number[len] = '\0'; 162 163 addrptr += size + 1; 164 size = amdgpu_fru_read_eeprom(adev, addrptr, buff); 165 166 if (size < 1) { 167 DRM_ERROR("Failed to read FRU product version, ret:%d", size); 168 return -EINVAL; 169 } 170 171 addrptr += size + 1; 172 size = amdgpu_fru_read_eeprom(adev, addrptr, buff); 173 174 if (size < 1) { 175 DRM_ERROR("Failed to read FRU serial number, ret:%d", size); 176 return -EINVAL; 177 } 178 179 len = size; 180 /* Serial number should only be 16 characters. Any more, 181 * and something could be wrong. Cap it at 16 to be safe 182 */ 183 if (len >= sizeof(adev->serial)) { 184 DRM_WARN("FRU Serial Number is larger than 16 characters. This is likely a mistake"); 185 len = sizeof(adev->serial) - 1; 186 } 187 memcpy(adev->serial, &buff[2], len); 188 adev->serial[len] = '\0'; 189 190 return 0; 191 } 192