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 30 #define I2C_PRODUCT_INFO_ADDR 0xAC 31 #define I2C_PRODUCT_INFO_ADDR_SIZE 0x2 32 #define I2C_PRODUCT_INFO_OFFSET 0xC0 33 34 bool is_fru_eeprom_supported(struct amdgpu_device *adev) 35 { 36 /* TODO: Gaming SKUs don't have the FRU EEPROM. 37 * Use this hack to address hangs on modprobe on gaming SKUs 38 * until a proper solution can be implemented by only supporting 39 * the explicit chip IDs for VG20 Server cards 40 * 41 * TODO: Add list of supported Arcturus DIDs once confirmed 42 */ 43 if ((adev->asic_type == CHIP_VEGA20 && adev->pdev->device == 0x66a0) || 44 (adev->asic_type == CHIP_VEGA20 && adev->pdev->device == 0x66a1) || 45 (adev->asic_type == CHIP_VEGA20 && adev->pdev->device == 0x66a4)) 46 return true; 47 return false; 48 } 49 50 int amdgpu_fru_read_eeprom(struct amdgpu_device *adev, uint32_t addrptr, 51 unsigned char *buff) 52 { 53 int ret, size; 54 struct i2c_msg msg = { 55 .addr = I2C_PRODUCT_INFO_ADDR, 56 .flags = I2C_M_RD, 57 .buf = buff, 58 }; 59 buff[0] = 0; 60 buff[1] = addrptr; 61 msg.len = I2C_PRODUCT_INFO_ADDR_SIZE + 1; 62 ret = i2c_transfer(&adev->pm.smu_i2c, &msg, 1); 63 64 if (ret < 1) { 65 DRM_WARN("FRU: Failed to get size field"); 66 return ret; 67 } 68 69 /* The size returned by the i2c requires subtraction of 0xC0 since the 70 * size apparently always reports as 0xC0+actual size. 71 */ 72 size = buff[2] - I2C_PRODUCT_INFO_OFFSET; 73 /* Add 1 since address field was 1 byte */ 74 buff[1] = addrptr + 1; 75 76 msg.len = I2C_PRODUCT_INFO_ADDR_SIZE + size; 77 ret = i2c_transfer(&adev->pm.smu_i2c, &msg, 1); 78 79 if (ret < 1) { 80 DRM_WARN("FRU: Failed to get data field"); 81 return ret; 82 } 83 84 return size; 85 } 86 87 int amdgpu_fru_get_product_info(struct amdgpu_device *adev) 88 { 89 unsigned char buff[34]; 90 int addrptr = 0, size = 0; 91 92 if (!is_fru_eeprom_supported(adev)) 93 return 0; 94 95 /* If algo exists, it means that the i2c_adapter's initialized */ 96 if (!adev->pm.smu_i2c.algo) { 97 DRM_WARN("Cannot access FRU, EEPROM accessor not initialized"); 98 return 0; 99 } 100 101 /* There's a lot of repetition here. This is due to the FRU having 102 * variable-length fields. To get the information, we have to find the 103 * size of each field, and then keep reading along and reading along 104 * until we get all of the data that we want. We use addrptr to track 105 * the address as we go 106 */ 107 108 /* The first fields are all of size 1-byte, from 0-7 are offsets that 109 * contain information that isn't useful to us. 110 * Bytes 8-a are all 1-byte and refer to the size of the entire struct, 111 * and the language field, so just start from 0xb, manufacturer size 112 */ 113 addrptr = 0xb; 114 size = amdgpu_fru_read_eeprom(adev, addrptr, buff); 115 if (size < 1) { 116 DRM_ERROR("Failed to read FRU Manufacturer, ret:%d", size); 117 return size; 118 } 119 120 /* Increment the addrptr by the size of the field, and 1 due to the 121 * size field being 1 byte. This pattern continues below. 122 */ 123 addrptr += size + 1; 124 size = amdgpu_fru_read_eeprom(adev, addrptr, buff); 125 if (size < 1) { 126 DRM_ERROR("Failed to read FRU product name, ret:%d", size); 127 return size; 128 } 129 130 /* Product name should only be 32 characters. Any more, 131 * and something could be wrong. Cap it at 32 to be safe 132 */ 133 if (size > 32) { 134 DRM_WARN("FRU Product Number is larger than 32 characters. This is likely a mistake"); 135 size = 32; 136 } 137 /* Start at 2 due to buff using fields 0 and 1 for the address */ 138 memcpy(adev->product_name, &buff[2], size); 139 adev->product_name[size] = '\0'; 140 141 addrptr += size + 1; 142 size = amdgpu_fru_read_eeprom(adev, addrptr, buff); 143 if (size < 1) { 144 DRM_ERROR("Failed to read FRU product number, ret:%d", size); 145 return size; 146 } 147 148 /* Product number should only be 16 characters. Any more, 149 * and something could be wrong. Cap it at 16 to be safe 150 */ 151 if (size > 16) { 152 DRM_WARN("FRU Product Number is larger than 16 characters. This is likely a mistake"); 153 size = 16; 154 } 155 memcpy(adev->product_number, &buff[2], size); 156 adev->product_number[size] = '\0'; 157 158 addrptr += size + 1; 159 size = amdgpu_fru_read_eeprom(adev, addrptr, buff); 160 161 if (size < 1) { 162 DRM_ERROR("Failed to read FRU product version, ret:%d", size); 163 return size; 164 } 165 166 addrptr += size + 1; 167 size = amdgpu_fru_read_eeprom(adev, addrptr, buff); 168 169 if (size < 1) { 170 DRM_ERROR("Failed to read FRU serial number, ret:%d", size); 171 return size; 172 } 173 174 /* Serial number should only be 16 characters. Any more, 175 * and something could be wrong. Cap it at 16 to be safe 176 */ 177 if (size > 16) { 178 DRM_WARN("FRU Serial Number is larger than 16 characters. This is likely a mistake"); 179 size = 16; 180 } 181 memcpy(adev->serial, &buff[2], size); 182 adev->serial[size] = '\0'; 183 184 return 0; 185 } 186