/* * This file is part of the coreboot project. * * Copyright 2017 secunet Security Networks AG * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation; version 2 of the License. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. */ #include #include #include #include #include #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, .enable_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 };