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/* Copyright 2021 The ChromiumOS Authors
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#include "amd_stt.h"
#include "chipset.h"
#include "common.h"
#include "console.h"
#include "driver/sb_rmi.h"
#include "hooks.h"
#include "math_util.h"
#include "temp_sensor.h"
#include "util.h"
/* Debug flag can be toggled with console command: stt debug */
static bool amd_stt_debug;
/* Console output macros */
#define CPUTS(outstr) cputs(CC_THERMAL, outstr)
#define CPRINTS(format, args...) cprints(CC_THERMAL, format, ##args)
static const char *const amd_stt_sensor_name[] = {
[AMD_STT_PCB_SENSOR_APU] = "APU",
[AMD_STT_PCB_SENSOR_REMOTE] = "Ambient",
[AMD_STT_PCB_SENSOR_GPU] = "GPU",
};
/**
* Write temperature sensor value to AP via SB-RMI
*
* sensor:
* AMD_STT_PCB_SENSOR_APU
* AMD_STT_PCB_SENSOR_REMOTE
* AMD_STT_PCB_SENSOR_GPU
*
* temp_mk:
* Temperature in degrees milli kelvin
*/
static int write_stt_sensor_val(enum amd_stt_pcb_sensor sensor, int temp_mk)
{
uint32_t msgIn = 0;
uint32_t msgOut;
int temp_mc;
int temp_c_fp_msb;
int temp_c_fp_lsb;
temp_mc = MILLI_KELVIN_TO_MILLI_CELSIUS(temp_mk);
if (amd_stt_debug)
CPRINTS("STT: %s = %d.%d °C", amd_stt_sensor_name[sensor],
temp_mc / 1000, temp_mc % 1000);
/* Divide by 1000 to get MSB of fixed point temp */
temp_c_fp_msb = temp_mc / 1000;
/* Modulus 1000 and multiply by 256/1000 to get LSB of fixed point*/
temp_c_fp_lsb = ((temp_mc % 1000) << 8) / 1000;
/*
* [15:0]: temperature as signed integer with 8 fractional bits.
* [23:16]: sensor index
* [31:24]: unused
*/
msgIn |= (temp_c_fp_lsb & 0xff);
msgIn |= (temp_c_fp_msb & 0xff) << 8;
msgIn |= (sensor & 0xff) << 16;
return sb_rmi_mailbox_xfer(SB_RMI_WRITE_STT_SENSOR_CMD, msgIn, &msgOut);
}
static void amd_stt_handler(void)
{
int rv;
int soc_temp_mk;
int ambient_temp_mk;
/* STT interface is only active in S0 */
if (!chipset_in_state(CHIPSET_STATE_ON))
return;
/*
* TODO(b/192391025): Replace with temp_sensor_read_mk(TEMP_SENSOR_SOC)
*/
rv = board_get_soc_temp_mk(&soc_temp_mk);
if (rv) {
CPRINTS("STT: Failed to read SOC temp rv:%d", rv);
return;
}
rv = write_stt_sensor_val(AMD_STT_PCB_SENSOR_APU, soc_temp_mk);
if (rv) {
CPRINTS("STT: Failed to write SOC temp rv:%d", rv);
return;
}
/*
* TODO(b/192391025): Replace with
* temp_sensor_read_mk(TEMP_SENSOR_AMBIENT)
*/
rv = board_get_ambient_temp_mk(&ambient_temp_mk);
if (rv) {
CPRINTS("STT: Failed to read AMBIENT temp rv:%d", rv);
return;
}
rv = write_stt_sensor_val(AMD_STT_PCB_SENSOR_REMOTE, ambient_temp_mk);
if (rv) {
CPRINTS("STT: Failed to write AMBIENT temp rv:%d", rv);
return;
}
}
DECLARE_HOOK(HOOK_SECOND, amd_stt_handler, HOOK_PRIO_TEMP_SENSOR + 1);
static int command_stt(int argc, const char **argv)
{
int sensor_id;
int temp;
if (argc < 2)
return EC_ERROR_PARAM1;
else if (!strcasecmp(argv[1], "debug")) {
amd_stt_debug = !amd_stt_debug;
return EC_SUCCESS;
} else if (argc != 3)
return EC_ERROR_PARAM2;
else if (!strcasecmp(argv[1],
amd_stt_sensor_name[AMD_STT_PCB_SENSOR_APU]))
sensor_id = AMD_STT_PCB_SENSOR_APU;
else if (!strcasecmp(argv[1],
amd_stt_sensor_name[AMD_STT_PCB_SENSOR_REMOTE]))
sensor_id = AMD_STT_PCB_SENSOR_REMOTE;
else if (!strcasecmp(argv[1],
amd_stt_sensor_name[AMD_STT_PCB_SENSOR_GPU]))
sensor_id = AMD_STT_PCB_SENSOR_GPU;
else
return EC_ERROR_PARAM2;
temp = atoi(argv[2]);
return write_stt_sensor_val(sensor_id, temp);
}
DECLARE_CONSOLE_COMMAND(stt, command_stt,
"<apu|ambient|gpu|debug> <temp in mK>",
"Write an STT mK temperature to AP");
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