LXR linux/drivers/gpu/drm/amd/amdgpu/amdgpu_fru

   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
  35static 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
  64static 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
  89int 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