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 /* TODO: Gaming SKUs don't have the FRU EEPROM. 38 * Use this hack to address hangs on modprobe on gaming SKUs 39 * until a proper solution can be implemented by only supporting 40 * the explicit chip IDs for VG20 Server cards 41 * 42 * TODO: Add list of supported Arcturus DIDs once confirmed 43 */ 44 if ((adev->asic_type == CHIP_VEGA20 && adev->pdev->device == 0x66a0) || 45 (adev->asic_type == CHIP_VEGA20 && adev->pdev->device == 0x66a1) || 46 (adev->asic_type == CHIP_VEGA20 && adev->pdev->device == 0x66a4)) 47 return true; 48 return false; 49 } 50 51 static int amdgpu_fru_read_eeprom(struct amdgpu_device *adev, uint32_t addrptr, 52 unsigned char *buff) 53 { 54 int ret, size; 55 struct i2c_msg msg = { 56 .addr = I2C_PRODUCT_INFO_ADDR, 57 .flags = I2C_M_RD, 58 .buf = buff, 59 }; 60 buff[0] = 0; 61 buff[1] = addrptr; 62 msg.len = I2C_PRODUCT_INFO_ADDR_SIZE + 1; 63 ret = i2c_transfer(&adev->pm.smu_i2c, &msg, 1); 64 65 if (ret < 1) { 66 DRM_WARN("FRU: Failed to get size field"); 67 return ret; 68 } 69 70 /* The size returned by the i2c requires subtraction of 0xC0 since the 71 * size apparently always reports as 0xC0+actual size. 72 */ 73 size = buff[2] - I2C_PRODUCT_INFO_OFFSET; 74 /* Add 1 since address field was 1 byte */ 75 buff[1] = addrptr + 1; 76 77 msg.len = I2C_PRODUCT_INFO_ADDR_SIZE + size; 78 ret = i2c_transfer(&adev->pm.smu_i2c, &msg, 1); 79 80 if (ret < 1) { 81 DRM_WARN("FRU: Failed to get data field"); 82 return ret; 83 } 84 85 return size; 86 } 87 88 int amdgpu_fru_get_product_info(struct amdgpu_device *adev) 89 { 90 unsigned char buff[34]; 91 int addrptr = 0, size = 0; 92 93 if (!is_fru_eeprom_supported(adev)) 94 return 0; 95 96 /* If algo exists, it means that the i2c_adapter's initialized */ 97 if (!adev->pm.smu_i2c.algo) { 98 DRM_WARN("Cannot access FRU, EEPROM accessor not initialized"); 99 return 0; 100 } 101 102 /* There's a lot of repetition here. This is due to the FRU having 103 * variable-length fields. To get the information, we have to find the 104 * size of each field, and then keep reading along and reading along 105 * until we get all of the data that we want. We use addrptr to track 106 * the address as we go 107 */ 108 109 /* The first fields are all of size 1-byte, from 0-7 are offsets that 110 * contain information that isn't useful to us. 111 * Bytes 8-a are all 1-byte and refer to the size of the entire struct, 112 * and the language field, so just start from 0xb, manufacturer size 113 */ 114 addrptr = 0xb; 115 size = amdgpu_fru_read_eeprom(adev, addrptr, buff); 116 if (size < 1) { 117 DRM_ERROR("Failed to read FRU Manufacturer, ret:%d", size); 118 return size; 119 } 120 121 /* Increment the addrptr by the size of the field, and 1 due to the 122 * size field being 1 byte. This pattern continues below. 123 */ 124 addrptr += size + 1; 125 size = amdgpu_fru_read_eeprom(adev, addrptr, buff); 126 if (size < 1) { 127 DRM_ERROR("Failed to read FRU product name, ret:%d", size); 128 return size; 129 } 130 131 /* Product name should only be 32 characters. Any more, 132 * and something could be wrong. Cap it at 32 to be safe 133 */ 134 if (size > 32) { 135 DRM_WARN("FRU Product Number is larger than 32 characters. This is likely a mistake"); 136 size = 32; 137 } 138 /* Start at 2 due to buff using fields 0 and 1 for the address */ 139 memcpy(adev->product_name, &buff[2], size); 140 adev->product_name[size] = '\0'; 141 142 addrptr += size + 1; 143 size = amdgpu_fru_read_eeprom(adev, addrptr, buff); 144 if (size < 1) { 145 DRM_ERROR("Failed to read FRU product number, ret:%d", size); 146 return size; 147 } 148 149 /* Product number should only be 16 characters. Any more, 150 * and something could be wrong. Cap it at 16 to be safe 151 */ 152 if (size > 16) { 153 DRM_WARN("FRU Product Number is larger than 16 characters. This is likely a mistake"); 154 size = 16; 155 } 156 memcpy(adev->product_number, &buff[2], size); 157 adev->product_number[size] = '\0'; 158 159 addrptr += size + 1; 160 size = amdgpu_fru_read_eeprom(adev, addrptr, buff); 161 162 if (size < 1) { 163 DRM_ERROR("Failed to read FRU product version, ret:%d", size); 164 return size; 165 } 166 167 addrptr += size + 1; 168 size = amdgpu_fru_read_eeprom(adev, addrptr, buff); 169 170 if (size < 1) { 171 DRM_ERROR("Failed to read FRU serial number, ret:%d", size); 172 return size; 173 } 174 175 /* Serial number should only be 16 characters. Any more, 176 * and something could be wrong. Cap it at 16 to be safe 177 */ 178 if (size > 16) { 179 DRM_WARN("FRU Serial Number is larger than 16 characters. This is likely a mistake"); 180 size = 16; 181 } 182 memcpy(adev->serial, &buff[2], size); 183 adev->serial[size] = '\0'; 184 185 return 0; 186 } 187