diff options
Diffstat (limited to 'driver/temp_sensor/amd_r19me4070.c')
| -rw-r--r-- | driver/temp_sensor/amd_r19me4070.c | 76 |
1 files changed, 76 insertions, 0 deletions
diff --git a/driver/temp_sensor/amd_r19me4070.c b/driver/temp_sensor/amd_r19me4070.c new file mode 100644 index 0000000000..5da1129052 --- /dev/null +++ b/driver/temp_sensor/amd_r19me4070.c @@ -0,0 +1,76 @@ +/* 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; +} |