diff options
Diffstat (limited to 'src/drivers/i2c/nct7802y/nct7802y_fan.c')
-rw-r--r-- | src/drivers/i2c/nct7802y/nct7802y_fan.c | 111 |
1 files changed, 111 insertions, 0 deletions
diff --git a/src/drivers/i2c/nct7802y/nct7802y_fan.c b/src/drivers/i2c/nct7802y/nct7802y_fan.c new file mode 100644 index 0000000000..f0f3a3ced8 --- /dev/null +++ b/src/drivers/i2c/nct7802y/nct7802y_fan.c @@ -0,0 +1,111 @@ +/* + * 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 <types.h> +#include <device/device.h> + +#include "nct7802y.h" +#include "chip.h" + +static void init_fan(struct device *const dev, + const struct nct7802y_fan_config *const config, + const unsigned int fan) +{ + unsigned int temp; + unsigned int i; + + nct7802y_update(dev, FAN_ENABLE, 0, FANx_ENABLE(fan)); + + /* By default, do not map any temperature control to the fan. */ + for (temp = 0; temp < NCT7802Y_FAN_CNT; ++temp) { + nct7802y_update(dev, TEMP_TO_FAN_MAP(temp), + TEMPx_TO_FANy_MAP(temp, fan), 0); + } + + if (config->mode == FAN_MANUAL) { + nct7802y_write(dev, FAN_CTRL(fan), config->duty_cycle); + } else { + u8 set = 0, div, mul; + if (config->smart.mode == SMART_FAN_RPM) { + set |= CLOSE_LOOP_FANx_EN(fan); + div = 50; + if (config->smart.speed == FAN_SPPED_HIGHSPEED) { + set |= CLOSE_LOOP_FANx_HIGH_RPM(fan); + div = 100; + } + mul = 1; + } else { + /* SMART_FAN_DUTY is given in %, 100% == 255. */ + div = 100; + mul = 255; + } + nct7802y_update(dev, CLOSE_LOOP_FAN_RPM_CTRL, + CLOSE_LOOP_FANx_EN(fan) | + CLOSE_LOOP_FANx_HIGH_RPM(fan), + set); + + /* Map TEMPx to FANx to make things simple */ + nct7802y_update(dev, TEMP_TO_FAN_MAP(fan), + TEMPx_TO_FAN_MAP_MASK(fan), + TEMPx_TO_FANy_MAP(fan, fan)); + + nct7802y_update(dev, FAN_CTRL_TEMP_SRC(fan), + FAN_CTRL_TEMPx_SRC_MASK(fan), + FAN_CTRL_TEMPx_SRCy( + fan, config->smart.tempsrc)); + + for (i = 0; i < ARRAY_SIZE(config->smart.table); ++i) { + nct7802y_write(dev, TABLEx_TEMP_POINTy(fan, i), + config->smart.table[i].temp); + nct7802y_write(dev, TABLEx_TARGET_POINTy(fan, i), + (config->smart.table[i].target * mul) / div); + } + nct7802y_write(dev, TABLEx_TEMP_POINTy(fan, 4), + config->smart.critical_temp); + } +} + +void nct7802y_init_fan(struct device *const dev) +{ + const struct drivers_i2c_nct7802y_config *const config = dev->chip_info; + unsigned int i; + u8 set; + + if (nct7802y_select_bank(dev, 0) != CB_SUCCESS) + return; + + for (i = 0; i < NCT7802Y_FAN_CNT; ++i) { + if (config->fan[i].mode != FAN_IGNORE) + init_fan(dev, &config->fan[i], i); + } + + switch (config->on_pecierror) { + case PECI_ERROR_KEEP: + set = CLOSE_LOOP_FAN_PECI_ERR_CURR; + break; + case PECI_ERROR_VALUE: + set = CLOSE_LOOP_FAN_PECI_ERR_VALUE; + break; + case PECI_ERROR_FULLSPEED: + set = CLOSE_LOOP_FAN_PECI_ERR_MAX; + break; + default: + set = 0; + break; + } + nct7802y_update(dev, CLOSE_LOOP_FAN_RPM_CTRL, + CLOSE_LOOP_FAN_PECI_ERR_MASK, set); + nct7802y_write(dev, FAN_DUTY_ON_PECI_ERROR, config->pecierror_minduty); +} |