1 files changed, 143 insertions, 0 deletions
diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_fru_eeprom.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_fru_eeprom.c
new file mode 100644
index 000000000000..990dee6e22d5
--- /dev/null
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_fru_eeprom.c
@@ -0,0 +1,143 @@
+/*
+ * Copyright 2019 Advanced Micro Devices, Inc.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
+ * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
+ * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
+ * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
+ * OTHER DEALINGS IN THE SOFTWARE.
+ *
+ */
+#include "amdgpu.h"
+#include "amdgpu_i2c.h"
+#include "smu_v11_0_i2c.h"
+#include "atom.h"
+
+#define I2C_PRODUCT_INFO_ADDR		0xAC
+#define I2C_PRODUCT_INFO_ADDR_SIZE	0x2
+#define I2C_PRODUCT_INFO_OFFSET		0xC0
+
+int amdgpu_fru_read_eeprom(struct amdgpu_device *adev, uint32_t addrptr,
+			   unsigned char *buff)
+{
+	int ret, size;
+	struct i2c_msg msg = {
+			.addr   = I2C_PRODUCT_INFO_ADDR,
+			.flags  = I2C_M_RD,
+			.buf    = buff,
+	};
+	buff[0] = 0;
+	buff[1] = addrptr;
+	msg.len = I2C_PRODUCT_INFO_ADDR_SIZE + 1;
+	ret = i2c_transfer(&adev->pm.smu_i2c, &msg, 1);
+
+	if (ret < 1) {
+		DRM_WARN("FRU: Failed to get size field");
+		return ret;
+	}
+
+	/* The size returned by the i2c requires subtraction of 0xC0 since the
+	 * size apparently always reports as 0xC0+actual size.
+	 */
+	size = buff[2] - I2C_PRODUCT_INFO_OFFSET;
+	/* Add 1 since address field was 1 byte */
+	buff[1] = addrptr + 1;
+
+	msg.len = I2C_PRODUCT_INFO_ADDR_SIZE + size;
+	ret = i2c_transfer(&adev->pm.smu_i2c, &msg, 1);
+
+	if (ret < 1) {
+		DRM_WARN("FRU: Failed to get data field");
+		return ret;
+	}
+
+	return size;
+}
+
+int amdgpu_fru_get_product_info(struct amdgpu_device *adev)
+{
+	unsigned char buff[32];
+	int addrptr = 0, size = 0;
+
+	/* If algo exists, it means that the i2c_adapter's initialized */
+	if (!adev->pm.smu_i2c.algo) {
+		DRM_WARN("Cannot access FRU, EEPROM accessor not initialized");
+		return 0;
+	}
+
+	/* There's a lot of repetition here. This is due to the FRU having
+	 * variable-length fields. To get the information, we have to find the
+	 * size of each field, and then keep reading along and reading along
+	 * until we get all of the data that we want. We use addrptr to track
+	 * the address as we go
+	 */
+
+	/* The first fields are all of size 1-byte, from 0-7 are offsets that
+	 * contain information that isn't useful to us.
+	 * Bytes 8-a are all 1-byte and refer to the size of the entire struct,
+	 * and the language field, so just start from 0xb, manufacturer size
+	 */
+	addrptr = 0xb;
+	size = amdgpu_fru_read_eeprom(adev, addrptr, buff);
+	if (size < 1) {
+		DRM_ERROR("Failed to read FRU Manufacturer, ret:%d", size);
+		return size;
+	}
+
+	/* Increment the addrptr by the size of the field, and 1 due to the
+	 * size field being 1 byte. This pattern continues below.
+	 */
+	addrptr += size + 1;
+	size = amdgpu_fru_read_eeprom(adev, addrptr, buff);
+	if (size < 1) {
+		DRM_ERROR("Failed to read FRU product name, ret:%d", size);
+		return size;
+	}
+
+	/* Start at 2 due to buff using fields 0 and 1 for the address */
+	memcpy(adev->product_name, &buff[2], size);
+	adev->product_name[size] = '\0';
+
+	addrptr += size + 1;
+	size = amdgpu_fru_read_eeprom(adev, addrptr, buff);
+	if (size < 1) {
+		DRM_ERROR("Failed to read FRU product number, ret:%d", size);
+		return size;
+	}
+
+	memcpy(adev->product_number, &buff[2], size);
+	adev->product_number[size] = '\0';
+
+	addrptr += size + 1;
+	size = amdgpu_fru_read_eeprom(adev, addrptr, buff);
+
+	if (size < 1) {
+		DRM_ERROR("Failed to read FRU product version, ret:%d", size);
+		return size;
+	}
+
+	addrptr += size + 1;
+	size = amdgpu_fru_read_eeprom(adev, addrptr, buff);
+
+	if (size < 1) {
+		DRM_ERROR("Failed to read FRU serial number, ret:%d", size);
+		return size;
+	}
+
+	memcpy(adev->serial, &buff[2], size);
+	adev->serial[size] = '\0';
+
+	return 0;
+}