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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"
#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 0x82
/*
* Tell SMBus slave which register to read before GPU read
* temperature, call it "GPU INIT".
*/
#define GPU_INIT_OFFSET 0x01
#define GPU_TEMPERATURE_OFFSET 0x03
#define GPU_INIT_WRITE_VALUE 0x0F01665A
static int initialized;
static int read_gpu_temp(int *temp)
{
return i2c_read32(I2C_PORT_GPU, GPU_ADDR_FLAGS, GPU_TEMPERATURE_OFFSET,
temp);
}
static void gpu_init_temp_sensor(void)
{
int rv;
rv = i2c_write32(I2C_PORT_GPU, GPU_ADDR_FLAGS, GPU_INIT_OFFSET,
GPU_INIT_WRITE_VALUE);
if (rv == EC_SUCCESS) {
initialized = 1;
return;
}
CPRINTS("init GPU fail");
}
DECLARE_HOOK(HOOK_INIT, gpu_init_temp_sensor, HOOK_PRIO_INIT_I2C + 1);
/* INIT GPU first before read the GPU's die tmeperature. */
int get_temp_R19ME4070(int idx, int *temp_ptr)
{
int reg, rv;
/* if no INIT GPU, must init it first and wait 1 sec. */
if (!initialized) {
gpu_init_temp_sensor();
return EC_ERROR_BUSY;
}
rv = read_gpu_temp(®);
if (rv) {
CPRINTS("read GPU Temperature fail");
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
*/
*temp_ptr = C_TO_K((reg >> 9) & (0x1ff));
return EC_SUCCESS;
}
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