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/* Copyright 2020 The Chromium OS Authors. All rights reserved.
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
/* R19ME4070 temperature sensor module for Chrome EC */
#include "chipset.h"
#include "common.h"
#include "console.h"
#include "hooks.h"
#include "i2c.h"
#include "amd_r19me4070.h"
#include "power.h"
#define CPRINTS(format, args...) cprints(CC_USBCHARGE, format, ## args)
#define CPRINTF(format, args...) cprintf(CC_USBCHARGE, format, ## args)
/* GPU I2C address */
#define GPU_ADDR_FLAGS 0x0041
#define GPU_INIT_OFFSET 0x01
#define GPU_TEMPERATURE_OFFSET 0x03
static int initialized;
/*
* Tell SMBus we want to read 4 Byte from register offset(0x01665A)
*/
static const uint8_t gpu_init_write_value[5] = {
0x04, 0x0F, 0x01, 0x66, 0x5A,
};
static void gpu_init_temp_sensor(void)
{
int rv;
rv = i2c_write_block(I2C_PORT_GPU, GPU_ADDR_FLAGS, GPU_INIT_OFFSET,
gpu_init_write_value,
ARRAY_SIZE(gpu_init_write_value));
if (rv == EC_SUCCESS) {
initialized = 1;
return;
}
CPRINTS("init GPU fail");
}
/* INIT GPU first before read the GPU's die tmeperature. */
int get_temp_R19ME4070(int idx, int *temp_ptr)
{
uint8_t reg[5];
int rv;
/*
* We shouldn't read the GPU temperature when the state
* is not in S0, because GPU is enabled in S0.
*/
if ((power_get_state()) != POWER_S0) {
*temp_ptr = C_TO_K(0);
return EC_ERROR_BUSY;
}
/* if no INIT GPU, must init it first and wait 1 sec. */
if (!initialized) {
gpu_init_temp_sensor();
*temp_ptr = C_TO_K(0);
return EC_ERROR_BUSY;
}
rv = i2c_read_block(I2C_PORT_GPU, GPU_ADDR_FLAGS,
GPU_TEMPERATURE_OFFSET, reg, ARRAY_SIZE(reg));
if (rv) {
CPRINTS("read GPU Temperature fail");
*temp_ptr = C_TO_K(0);
return rv;
}
/*
* The register is four bytes, bit[17:9] represents the GPU temperature.
* 0x000 : 0 ﾟC
* 0x001 : 1 ﾟC
* 0x002 : 2 ﾟC
* ...
* 0x1FF : 511 ﾟC
* -------------------------------
* reg[4] = bit0 - bit7
* reg[3] = bit8 - bit15
* reg[2] = bit16 - bit23
* reg[1] = bit24 - bit31
* reg[0] = 0x04
*/
*temp_ptr = C_TO_K(reg[3] >> 1);
return EC_SUCCESS;
}
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