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/* Copyright 2016 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.
*/
#include "atomic.h"
#include "common.h"
#include "console.h"
#include "dptf.h"
#include "hooks.h"
#include "host_command.h"
#include "temp_sensor.h"
#include "util.h"
/* Console output macros */
#define CPUTS(outstr) cputs(CC_DPTF, outstr)
#define CPRINTS(format, args...) cprints(CC_DPTF, format, ## args)
/*****************************************************************************/
/* DPTF temperature thresholds */
static struct {
int temp; /* degrees K, negative for disabled */
cond_t over; /* watch for crossings */
} dptf_threshold[TEMP_SENSOR_COUNT][DPTF_THRESHOLDS_PER_SENSOR];
static void dptf_init(void)
{
int id, t;
for (id = 0; id < TEMP_SENSOR_COUNT; id++)
for (t = 0; t < DPTF_THRESHOLDS_PER_SENSOR; t++) {
dptf_threshold[id][t].temp = -1;
cond_init(&dptf_threshold[id][t].over, 0);
}
}
DECLARE_HOOK(HOOK_INIT, dptf_init, HOOK_PRIO_DEFAULT);
/* Keep track of which triggered sensor thresholds the AP has seen */
static uint32_t dptf_seen;
int dptf_query_next_sensor_event(void)
{
int id;
for (id = 0; id < TEMP_SENSOR_COUNT; id++)
if (dptf_seen & (1 << id)) { /* atomic? */
atomic_clear(&dptf_seen, (1 << id));
return id;
}
return -1;
}
/* Return true if any threshold transition occurs. */
static int dpft_check_temp_threshold(int sensor_id, int temp)
{
int tripped = 0;
int max, i;
for (i = 0; i < DPTF_THRESHOLDS_PER_SENSOR; i++) {
max = dptf_threshold[sensor_id][i].temp;
if (max < 0) /* disabled? */
continue;
if (temp >= max)
cond_set_true(&dptf_threshold[sensor_id][i].over);
else if (temp <= max - DPTF_THRESHOLD_HYSTERESIS)
cond_set_false(&dptf_threshold[sensor_id][i].over);
if (cond_went_true(&dptf_threshold[sensor_id][i].over)) {
CPRINTS("DPTF over threshold [%d][%d",
sensor_id, i);
atomic_or(&dptf_seen, (1 << sensor_id));
tripped = 1;
}
if (cond_went_false(&dptf_threshold[sensor_id][i].over)) {
CPRINTS("DPTF under threshold [%d][%d",
sensor_id, i);
atomic_or(&dptf_seen, (1 << sensor_id));
tripped = 1;
}
}
return tripped;
}
void dptf_set_temp_threshold(int sensor_id, int temp, int idx, int enable)
{
CPRINTS("DPTF sensor %d, threshold %d C, index %d, %sabled",
sensor_id, K_TO_C(temp), idx, enable ? "en" : "dis");
if (enable) {
/* Don't update threshold condition if already enabled */
if (dptf_threshold[sensor_id][idx].temp == -1)
cond_init(&dptf_threshold[sensor_id][idx].over, 0);
dptf_threshold[sensor_id][idx].temp = temp;
atomic_clear(&dptf_seen, (1 << sensor_id));
} else {
dptf_threshold[sensor_id][idx].temp = -1;
}
}
/*****************************************************************************/
/* EC-specific thermal controls */
test_mockable_static void smi_sensor_failure_warning(void)
{
CPRINTS("can't read any temp sensors!");
host_set_single_event(EC_HOST_EVENT_THERMAL);
}
static void thermal_control_dptf(void)
{
int i, t, rv;
int dptf_tripped;
int num_sensors_read;
dptf_tripped = 0;
num_sensors_read = 0;
/* go through all the sensors */
for (i = 0; i < TEMP_SENSOR_COUNT; ++i) {
rv = temp_sensor_read(i, &t);
if (rv != EC_SUCCESS)
continue;
else
num_sensors_read++;
/* and check the dptf thresholds */
dptf_tripped |= dpft_check_temp_threshold(i, t);
}
if (!num_sensors_read) {
/*
* Trigger a SMI event if we can't read any sensors.
*
* In theory we could do something more elaborate like forcing
* the system to shut down if no sensors are available after
* several retries. This is a very unlikely scenario -
* particularly on LM4-based boards, since the LM4 has its own
* internal temp sensor. It's most likely to occur during
* bringup of a new board, where we haven't debugged the I2C
* bus to the sensors; forcing a shutdown in that case would
* merely hamper board bringup.
*/
smi_sensor_failure_warning();
}
/* Don't forget to signal any DPTF thresholds */
if (dptf_tripped)
host_set_single_event(EC_HOST_EVENT_THERMAL_THRESHOLD);
}
/* Wait until after the sensors have been read */
DECLARE_HOOK(HOOK_SECOND, thermal_control_dptf, HOOK_PRIO_TEMP_SENSOR_DONE);
/*****************************************************************************/
/* Console commands */
static int command_dptftemp(int argc, char **argv)
{
int id, t;
int temp, trig;
ccprintf("sensor thresh0 thresh1\n");
for (id = 0; id < TEMP_SENSOR_COUNT; id++) {
ccprintf(" %2d", id);
for (t = 0; t < DPTF_THRESHOLDS_PER_SENSOR; t++) {
temp = dptf_threshold[id][t].temp;
trig = cond_is_true(&dptf_threshold[id][t].over);
if (temp < 0)
ccprintf(" --- ");
else
ccprintf(" %3d%c", temp,
trig ? '*' : ' ');
}
ccprintf(" %s\n", temp_sensors[id].name);
}
ccprintf("AP seen mask: 0x%08x\n", dptf_seen);
return EC_SUCCESS;
}
DECLARE_CONSOLE_COMMAND(dptftemp, command_dptftemp,
NULL,
"Print DPTF thermal parameters (degrees Kelvin)");
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