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/* Copyright 2022 The ChromiumOS Authors
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
/* Physical fans. These are logically separate from pwm_channels. */
#include "common.h"
#include "compile_time_macros.h"
#include "console.h"
#include "fan_chip.h"
#include "fan.h"
#include "hooks.h"
#include "pwm.h"
#include "util.h"
/* MFT channels. These are logically separate from pwm_channels. */
const struct mft_t mft_channels[] = {
[MFT_CH_0] = {
.module = NPCX_MFT_MODULE_1,
.clk_src = TCKC_LFCLK,
.pwm_id = PWM_CH_FAN,
},
[MFT_CH_1] = {
.module = NPCX_MFT_MODULE_2,
.clk_src = TCKC_LFCLK,
.pwm_id = PWM_CH_FAN2,
},
};
BUILD_ASSERT(ARRAY_SIZE(mft_channels) == MFT_CH_COUNT);
static const struct fan_conf fan_conf_0 = {
.flags = FAN_USE_RPM_MODE,
.ch = MFT_CH_0, /* Use MFT id to control fan */
.pgood_gpio = -1,
.enable_gpio = GPIO_EN_PP5000_FAN,
};
static const struct fan_conf fan_conf_1 = {
.flags = FAN_USE_RPM_MODE,
.ch = MFT_CH_1, /* Use MFT id to control fan */
.pgood_gpio = -1,
.enable_gpio = GPIO_EN_PP5000_FAN2,
};
/*
* TODO(b/234545460): thermistor placement and calibration
*
* Prototype fan spins at about 4200 RPM at 100% PWM, this
* is specific to board ID 2 and might also apears in later
* boards as well.
*/
static const struct fan_rpm fan_rpm_0 = {
.rpm_min = 2500,
.rpm_start = 2500,
.rpm_max = 6000,
};
static const struct fan_rpm fan_rpm_1 = {
.rpm_min = 2500,
.rpm_start = 2500,
.rpm_max = 6000,
};
const struct fan_t fans[FAN_CH_COUNT] = {
[FAN_CH_0] = {
.conf = &fan_conf_0,
.rpm = &fan_rpm_0,
},
[FAN_CH_1] = {
.conf = &fan_conf_1,
.rpm = &fan_rpm_1,
},
};
/* fan control */
struct fan_step {
int on;
int off;
int rpm;
};
struct fan_table_config {
/* number of control_table */
uint8_t step;
/* fan control table */
const struct fan_step *control_table;
};
const struct fan_step fan_table0[] = {
{ .on = 25, .off = 0, .rpm = 0 },
{ .on = 37, .off = 34, .rpm = 2500 },
{ .on = 42, .off = 39, .rpm = 2800 },
{ .on = 46, .off = 43, .rpm = 3000 },
{ .on = 51, .off = 48, .rpm = 3200 },
{ .on = 55, .off = 52, .rpm = 3600 },
{ .on = 59, .off = 56, .rpm = 4000 },
{ .on = 66, .off = 63, .rpm = 4600 },
{ .on = 72, .off = 69, .rpm = 5000 },
{ .on = 74, .off = 71, .rpm = 5500 },
};
const int fan_table0_count = ARRAY_SIZE(fan_table0);
const struct fan_step fan_table1[] = {
{ .on = 25, .off = 0, .rpm = 0 },
{ .on = 51, .off = 48, .rpm = 3200 },
{ .on = 55, .off = 52, .rpm = 3600 },
{ .on = 59, .off = 56, .rpm = 4000 },
{ .on = 66, .off = 63, .rpm = 4600 },
{ .on = 72, .off = 69, .rpm = 5000 },
{ .on = 74, .off = 71, .rpm = 5500 },
};
const int fan_table1_count = ARRAY_SIZE(fan_table1);
/* Fan control configuration */
static struct fan_table_config fan_tables[] = {
[FAN_CH_0] = {
.step = fan_table0_count,
.control_table = (const struct fan_step *) &fan_table0,
},
[FAN_CH_1] = {
.step = fan_table1_count,
.control_table = (const struct fan_step *) &fan_table1,
},
};
BUILD_ASSERT(ARRAY_SIZE(fan_tables) == FAN_CH_COUNT);
static int current_level[] = { 0, 0 };
BUILD_ASSERT(ARRAY_SIZE(current_level) == FAN_CH_COUNT);
static int previous_level[] = { 0, 0 };
BUILD_ASSERT(ARRAY_SIZE(previous_level) == FAN_CH_COUNT);
#undef BOARD_FAN_TEST
#ifdef BOARD_FAN_TEST
static int manual_temp = -1;
#endif
int fan_percent_to_rpm(int fan, int pct)
{
static struct fan_table_config *fan_table;
static int previous_pct;
int i;
fan_table = &fan_tables[fan];
#ifdef BOARD_FAN_TEST
if (manual_temp != -1)
pct = manual_temp;
#endif
/*
* Compare the pct and previous pct, we have the three paths :
* 1. decreasing path. (check the off point)
* 2. increasing path. (check the on point)
* 3. invariant path. (return the current RPM)
*/
if (pct < previous_pct) {
for (i = current_level[fan]; i >= 0; i--) {
if (pct <= fan_table->control_table[i].off)
current_level[fan] = i - 1;
else
break;
}
} else if (pct > previous_pct) {
for (i = current_level[fan] + 1; i < fan_table->step; i++) {
if (pct >= fan_table->control_table[i].on)
current_level[fan] = i;
else
break;
}
}
if (current_level[fan] < 0)
current_level[fan] = 0;
if (current_level[fan] != previous_level[fan])
cprints(CC_THERMAL, "Fan %d: Set fan RPM to %d", fan,
fan_table->control_table[current_level[fan]].rpm);
if (fan == (FAN_CH_COUNT - 1))
previous_pct = pct;
#ifdef BOARD_FAN_TEST
if (manual_temp != -1)
ccprints("Fan%d: temps:%d curr:%d prev:%d rpm:%d", fan, pct,
current_level[fan], previous_level[fan],
fan_table->control_table[current_level[fan]].rpm);
#endif
previous_level[fan] = current_level[fan];
return fan_table->control_table[current_level[fan]].rpm;
}
#ifdef BOARD_FAN_TEST
static int command_fan_test(int argc, const char **argv)
{
char *e;
int t;
if (argc > 1) {
t = strtoi(argv[1], &e, 0);
if (*e) {
ccprints("Invalid test temp");
return EC_ERROR_INVAL;
}
manual_temp = t;
ccprints("manual temp is %d", manual_temp);
return EC_SUCCESS;
}
manual_temp = -1;
ccprints("manual temp reset");
return EC_SUCCESS;
}
DECLARE_CONSOLE_COMMAND(fan_test, command_fan_test, "[temperature]",
"set manual temperature for fan test");
#endif
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