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
 35static 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
 51static 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
 88int 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}