lm96000.c

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/* SPDX-License-Identifier: GPL-2.0-only */
 
#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         = noop_read_resources,
        .set_resources          = noop_set_resources,
        .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
};