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