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/* SPDX-License-Identifier: GPL-2.0-only */
/* This file is part of the coreboot project. */
#include <delay.h>
#include <timer.h>
#include <console/console.h>
#include <device/device.h>
#include <device/i2c_bus.h>
#include "lm96000.h"
#include "chip.h"
static inline int lm96000_read(struct device *const dev, const u8 reg)
{
return i2c_dev_readb_at(dev, reg);
}
static inline int lm96000_write(struct device *const dev,
const u8 reg, const u8 value)
{
return i2c_dev_writeb_at(dev, reg, value);
}
static inline int lm96000_update(struct device *const dev, const u8 reg,
const u8 clear_mask, const u8 set_mask)
{
const int val = i2c_dev_readb_at(dev, reg);
if (val < 0)
return val;
return i2c_dev_writeb_at(dev, reg, (val & ~clear_mask) | set_mask);
}
static const unsigned int ref_mv[] = { 2500, 2250, 3300, 5000, 12000 };
static u8 lm96000_to_low_limit(const enum lm96000_vin ref, const u16 limit)
{
const unsigned int reg =
(unsigned int)limit * 0xc0 / ref_mv[ref];
return reg < 0xff ? reg : 0xff;
}
static u8 lm96000_to_high_limit(const enum lm96000_vin ref, const u16 limit)
{
const unsigned int reg =
DIV_ROUND_UP((unsigned int)limit * 0xc0, ref_mv[ref]);
return reg < 0xff ? reg : 0xff;
}
static void lm96000_set_vin_limits(struct device *const dev,
const struct drivers_i2c_lm96000_config *const config)
{
unsigned int i;
for (i = 0; i < LM96000_VIN_CNT; ++i) {
lm96000_write(dev, LM96000_VIN_LOW_LIMIT(i),
lm96000_to_low_limit(i, config->vin[i].low));
if (config->vin[i].high > config->vin[i].low)
lm96000_write(dev, LM96000_VIN_HIGH_LIMIT(i),
lm96000_to_high_limit(i, config->vin[i].high));
else
lm96000_write(dev, LM96000_VIN_HIGH_LIMIT(i), 0xff);
}
}
static void lm96000_set_temp_limits(struct device *const dev,
const struct drivers_i2c_lm96000_config *const config)
{
unsigned int i;
for (i = 0; i < LM96000_TEMP_IN_CNT; ++i) {
lm96000_write(dev, LM96000_TEMP_LOW_LIMIT(i),
config->temp_in[i].low);
if (config->temp_in[i].high > config->temp_in[i].low)
lm96000_write(dev, LM96000_TEMP_HIGH_LIMIT(i),
config->temp_in[i].high);
else
lm96000_write(dev, LM96000_TEMP_HIGH_LIMIT(i), 0x7f);
}
}
static u16 lm96000_rpm_to_tach(const u16 rpm)
{
return rpm ? (60 * 90000 / rpm) & 0xfffc : 0xfffc;
}
static void lm96000_set_fan_limits(struct device *const dev,
const struct drivers_i2c_lm96000_config *const config)
{
unsigned int i;
for (i = 0; i < LM96000_FAN_IN_CNT; ++i) {
const u16 tach = lm96000_rpm_to_tach(config->fan_in[i].low);
lm96000_write(dev, LM96000_FAN_LOW_LIMIT(i), tach & 0xff);
lm96000_write(dev, LM96000_FAN_LOW_LIMIT(i) + 1, tach >> 8);
}
}
static u8 lm96000_to_duty(const u8 duty_cycle)
{
return duty_cycle * 255 / 100;
}
static void lm96000_configure_pwm(struct device *const dev,
const unsigned int fan,
const struct lm96000_fan_config *const config)
{
lm96000_update(dev, LM96000_FAN_CFG(fan),
LM96000_FAN_CFG_MODE_MASK | LM96000_FAN_CFG_PWM_INVERT |
LM96000_FAN_CFG_SPINUP_MASK,
((config->mode << LM96000_FAN_CFG_MODE_SHIFT)
& LM96000_FAN_CFG_MODE_MASK) |
(config->invert ? LM96000_FAN_CFG_PWM_INVERT : 0) |
config->spinup);
lm96000_update(dev, LM96000_FAN_FREQ(fan),
LM96000_FAN_FREQ_MASK, config->freq);
lm96000_update(dev, LM96000_TACH_MONITOR_MODE,
LM96000_TACH_MODE_FAN_MASK(fan),
config->freq <= LM96000_PWM_94HZ
? config->tach << LM96000_TACH_MODE_FAN_SHIFT(fan) : 0);
switch (config->mode) {
case LM96000_FAN_ZONE_1_AUTO:
case LM96000_FAN_ZONE_2_AUTO:
case LM96000_FAN_ZONE_3_AUTO:
case LM96000_FAN_HOTTEST_23:
case LM96000_FAN_HOTTEST_123:
lm96000_write(dev, LM96000_FAN_MIN_PWM(fan),
lm96000_to_duty(config->min_duty));
break;
case LM96000_FAN_MANUAL:
lm96000_write(dev, LM96000_FAN_DUTY(fan),
lm96000_to_duty(config->duty_cycle));
break;
default:
break;
}
}
static void lm96000_configure_temp_zone(struct device *const dev,
const unsigned int zone,
const struct lm96000_temp_zone *const config)
{
static const u8 temp_range[] =
{ 2, 3, 3, 4, 5, 7, 8, 10, 13, 16, 20, 27, 32, 40, 53, 80 };
unsigned int i;
/* find longest range that starts from `low_temp` */
for (i = ARRAY_SIZE(temp_range) - 1; i > 0; --i) {
if (config->low_temp + temp_range[i] <= config->target_temp)
break;
}
lm96000_update(dev, LM96000_ZONE_RANGE(zone),
LM96000_ZONE_RANGE_MASK, i << LM96000_ZONE_RANGE_SHIFT);
lm96000_write(dev, LM96000_ZONE_TEMP_LOW(zone),
config->target_temp >= temp_range[i]
? config->target_temp - temp_range[i]
: 0);
lm96000_write(dev, LM96000_ZONE_TEMP_PANIC(zone),
config->panic_temp ? config->panic_temp : 100);
lm96000_update(dev, LM96000_ZONE_SMOOTH(zone),
LM96000_ZONE_SMOOTH_MASK(zone),
LM96000_ZONE_SMOOTH_EN(zone) | 0); /* 0: 35s */
lm96000_update(dev, LM96000_FAN_MIN_OFF,
LM96000_FAN_MIN(zone),
config->min_off ? LM96000_FAN_MIN(zone) : 0);
lm96000_update(dev, LM96000_ZONE_HYSTERESIS(zone),
LM96000_ZONE_HYST_MASK(zone),
config->hysteresis << LM96000_ZONE_HYST_SHIFT(zone)
& LM96000_ZONE_HYST_MASK(zone));
}
static void lm96000_init(struct device *const dev)
{
const struct drivers_i2c_lm96000_config *const config = dev->chip_info;
unsigned int i;
int lm_config;
struct stopwatch sw;
printk(BIOS_DEBUG, "lm96000: Initialization hardware monitoring.\n");
stopwatch_init_msecs_expire(&sw, 1000);
lm_config = lm96000_read(dev, LM96000_CONFIG);
while ((lm_config < 0 || !((unsigned int)lm_config & LM96000_READY))) {
mdelay(1);
lm_config = lm96000_read(dev, LM96000_CONFIG);
if (stopwatch_expired(&sw))
break;
}
if (lm_config < 0 || !((unsigned int)lm_config & LM96000_READY)) {
printk(BIOS_INFO, "lm96000: Not ready after 1s.\n");
return;
}
lm96000_set_vin_limits(dev, config);
lm96000_set_temp_limits(dev, config);
lm96000_set_fan_limits(dev, config);
for (i = 0; i < LM96000_PWM_CTL_CNT; ++i) {
if (config->fan[i].mode != LM96000_FAN_IGNORE)
lm96000_configure_pwm(dev, i, config->fan + i);
}
for (i = 0; i < LM96000_TEMP_ZONE_CNT; ++i)
lm96000_configure_temp_zone(dev, i, config->zone + i);
lm96000_update(dev, LM96000_CONFIG, 0, LM96000_START);
}
static struct device_operations lm96000_ops = {
.read_resources = DEVICE_NOOP,
.set_resources = DEVICE_NOOP,
.init = lm96000_init,
};
static void lm96000_enable(struct device *const dev)
{
dev->ops = &lm96000_ops;
}
struct chip_operations drivers_i2c_lm96000_ops = {
CHIP_NAME("LM96000")
.enable_dev = lm96000_enable
};
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