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
is_fru_eeprom_supported(struct amdgpu_device * adev)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
amdgpu_fru_read_eeprom(struct amdgpu_device * adev,uint32_t addrptr,unsigned char * buff)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
amdgpu_fru_get_product_info(struct amdgpu_device * adev)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