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/* SPDX-License-Identifier: GPL-2.0-only */
#include <acpi/acpigen.h>
#include <console/console.h>
#include <device/device.h>
#include <device/mmio.h>
#include <stdio.h>
#include "chip.h"
#include "ec.h"
#include "commands.h"
static bool is_curve_valid(struct ec_clevo_it5570e_fan_curve curve)
{
/*
* Fan curve speeds have to be non-decreasing.
* Fan curve temperatures have to be increasing (to avoid division by 0).
* This also covers the case when the curve is all zeroes (i.e. not configured).
*/
for (int i = 1; i < IT5570E_FAN_CURVE_LEN; i++) {
if (curve.speed[i] < curve.speed[i - 1] ||
curve.temperature[i] <= curve.temperature[i - 1])
return false;
}
return true;
}
static void write_fan_curve(struct ec_clevo_it5570e_fan_curve curve, int fan)
{
uint16_t ramp;
char fieldname[5];
/* Curve points */
for (int i = 0; i < IT5570E_FAN_CURVE_LEN; i++) {
snprintf(fieldname, 5, "F%dT%d", fan + 1, i + 1);
acpigen_write_store_int_to_namestr(curve.temperature[i], fieldname);
snprintf(fieldname, 5, "F%dD%d", fan + 1, i + 1);
acpigen_write_store_int_to_namestr(curve.speed[i] * 255 / 100, fieldname);
}
/* Ramps */
for (int i = 0; i < (IT5570E_FAN_CURVE_LEN - 1); i++) {
ramp = 255 * 16 *
(curve.speed[i + 1] - curve.speed[i]) /
(curve.temperature[i + 1] - curve.temperature[i]) /
100;
snprintf(fieldname, 5, "F%dR%d", fan + 1, i + 1);
acpigen_write_store_int_to_namestr(ramp, fieldname);
}
}
static void write_fan_opregion(int fan_cnt)
{
char fieldname[5];
uint8_t flags = FIELD_ANYACC | FIELD_LOCK | FIELD_PRESERVE;
struct opregion opreg = {
.name = "FNCV",
.regionspace = SYSTEMMEMORY,
.regionoffset = CONFIG_EC_CLEVO_IT5570E_MEM_BASE + 0x38c,
.regionlen = fan_cnt * 14,
};
acpigen_write_opregion(&opreg);
acpigen_emit_ext_op(FIELD_OP);
acpigen_write_len_f();
acpigen_emit_namestring(opreg.name);
acpigen_emit_byte(flags);
for (int fan = 1; fan <= fan_cnt; fan++) {
/* temps */
for (int i = 1; i <= IT5570E_FAN_CURVE_LEN; i++) {
snprintf(fieldname, 5, "F%dT%d", fan, i);
acpigen_write_field_name(fieldname, 8);
}
/* duties */
for (int i = 1; i <= IT5570E_FAN_CURVE_LEN; i++) {
snprintf(fieldname, 5, "F%dD%d", fan, i);
acpigen_write_field_name(fieldname, 8);
}
/* ramps */
for (int i = 1; i < IT5570E_FAN_CURVE_LEN; i++) {
snprintf(fieldname, 5, "F%dR%d", fan, i);
acpigen_write_field_name(fieldname, 16);
}
}
acpigen_pop_len(); /* Field */
}
/*
* Set Fan curve
* The function must exist even if the fan curve isn't enabled in devicetree.
*/
void ec_fan_curve_fill_ssdt(const struct device *dev)
{
const ec_config_t *config = config_of(dev);
const int fan_cnt = read8p(ECRAM + FANC);
acpigen_write_scope(acpi_device_path(dev));
write_fan_opregion(fan_cnt);
acpigen_write_method("SFCV", 0);
if (config->fan_mode == FAN_MODE_CUSTOM) {
int curve_cnt = 0;
/* Check curve count against fan count from EC */
for (int i = 0; i < IT5570E_MAX_FAN_CNT; i++)
if (*config->fan_curves[i].speed && *config->fan_curves[i].temperature)
curve_cnt++;
if (curve_cnt != fan_cnt) {
printk(BIOS_WARNING,
"EC: Fan curve count (%d) does not match fan count (%d). "
"Check your devicetree!\n", curve_cnt, fan_cnt);
goto pop;
}
/*
* Check all curves.
* Custom mode can only be enabled for all fans or none. Thus, all
* custom curves must be valid before custom mode can be enabled.
*/
bool error = false;
for (int i = 0; i < fan_cnt; i++) {
if (!is_curve_valid(config->fan_curves[i])) {
printk(BIOS_ERR,
"EC: Fan %d curve invalid. Check your devicetree!\n", i);
error = true;
}
}
if (error)
goto pop;
acpigen_write_debug_string("EC: Apply custom fan curve");
for (int i = 0; i < fan_cnt; i++)
write_fan_curve(config->fan_curves[i], i);
/* Enable custom fan mode */
acpigen_write_store_int_to_namestr(0x04, "FDAT");
acpigen_emit_namestring("SFCC");
acpigen_write_integer(0xd7);
}
pop:
acpigen_pop_len(); /* Method */
acpigen_pop_len(); /* Scope */
}
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