/* SPDX-License-Identifier: GPL-2.0-only */ #include <commonlib/bsd/bcd.h> #include <console/console.h> #include <device/smbus.h> #include <version.h> #include "chip.h" /* Set RTC date from coreboot build date. */ static void pcf8523_set_build_date(struct device *dev) { smbus_write_byte(dev, YEAR_REG, coreboot_build_date.year); smbus_write_byte(dev, MONTH_REG, coreboot_build_date.month); smbus_write_byte(dev, WEEKDAY_REG, coreboot_build_date.weekday); smbus_write_byte(dev, DAY_REG, coreboot_build_date.day); } /* Set RTC date from user defined date (available in e.g. device tree). */ static void pcf8523_set_user_date(struct device *dev) { struct drivers_i2c_pcf8523_config *config = dev->chip_info; smbus_write_byte(dev, YEAR_REG, bin2bcd(config->user_year)); smbus_write_byte(dev, MONTH_REG, bin2bcd(config->user_month)); smbus_write_byte(dev, DAY_REG, bin2bcd(config->user_day)); smbus_write_byte(dev, WEEKDAY_REG, bin2bcd(config->user_weekday)); } static void pcf8523_final(struct device *dev) { /* Read back current RTC date and time and print it to the console. */ printk(BIOS_INFO, "%s: Current date %02d.%02d.%02d %02d:%02d:%02d\n", dev->chip_ops->name, bcd2bin(smbus_read_byte(dev, MONTH_REG)), bcd2bin(smbus_read_byte(dev, DAY_REG)), bcd2bin(smbus_read_byte(dev, YEAR_REG)), bcd2bin(smbus_read_byte(dev, HOUR_REG)), bcd2bin(smbus_read_byte(dev, MINUTE_REG)), bcd2bin(smbus_read_byte(dev, SECOND_REG)) & ~OS_BIT); } static void pcf8523_init(struct device *dev) { struct drivers_i2c_pcf8523_config *config = dev->chip_info; uint8_t reg = 0; if (!(smbus_read_byte(dev, SECOND_REG) & OS_BIT)) { /* Set control registers to a known good value even if no * power loss event was recognized. There were issues with * this RTC in the past where control registers were * corrupted and OS bit was not set. */ reg = smbus_read_byte(dev, CTRL_REG_1); reg &= ~(STOP_BIT | CAP_SEL); reg |= ((!!config->cap_sel) << 7); smbus_write_byte(dev, CTRL_REG_1, reg); reg = smbus_read_byte(dev, CTRL_REG_3); reg &= ~PM_MASK; reg |= ((config->power_mode & 0x07) << 5); smbus_write_byte(dev, CTRL_REG_3, reg); reg = smbus_read_byte(dev, TMR_CLKOUT_REG); reg &= ~COF_MASK; reg |= ((config->cof_selection & 0x07) << 3); smbus_write_byte(dev, TMR_CLKOUT_REG, reg); return; } /* Initialize the RTC fully only if a power-loss event was recognized. * In this case RTC will be set up with default date and time. */ smbus_write_byte(dev, CTRL_REG_1, ((!!config->cap_sel) << 7) | ((!!config->second_int_en) << 2) | ((!!config->alarm_int_en) << 1) | (!!config->correction_int_en)); smbus_write_byte(dev, CTRL_REG_2, ((!!config->wdt_int_en) << 2) | ((!!config->tmrA_int_en) << 1) | (!!config->tmrB_int_en)); smbus_write_byte(dev, CTRL_REG_3, ((config->power_mode & 0x07) << 5) | ((!!config->bat_switch_int_en) << 1) | (!!config->bat_low_int_en)); smbus_write_byte(dev, OFFSET_REG, ((!!config->offset_mode) << 7) | (config->offset_val & 0x7f)); smbus_write_byte(dev, TMR_CLKOUT_REG, ((!!config->tmrA_int_mode) << 7) | ((!!config->tmrB_int_mode) << 6) | ((config->cof_selection & 0x07) << 3) | ((config->tmrA_mode & 0x03) << 1) | (!!config->tmrB_mode)); smbus_write_byte(dev, TMR_A_FREQ_REG, (config->tmrA_prescaler & 0x7)); smbus_write_byte(dev, TMR_B_FREQ_REG, (config->tmrB_prescaler & 0x7) | ((config->tmrB_pulse_cfg & 0x7) << 4)); /* Before setting the clock stop oscillator. */ reg = smbus_read_byte(dev, CTRL_REG_1); reg |= STOP_BIT; smbus_write_byte(dev, CTRL_REG_1, reg); if (config->set_user_date) { /* Set user date defined in device tree. */ printk(BIOS_DEBUG, "%s: Set to user date\n", dev->chip_ops->name); pcf8523_set_user_date(dev); } else { /* Set date from coreboot build. */ printk(BIOS_DEBUG, "%s: Set to coreboot build date\n", dev->chip_ops->name); pcf8523_set_build_date(dev); } /* Set time to 01:00:00 */ smbus_write_byte(dev, HOUR_REG, 1); smbus_write_byte(dev, MINUTE_REG, 0); smbus_write_byte(dev, SECOND_REG, 0); /* Start oscillator again as the clock is set up now */ reg &= ~STOP_BIT; smbus_write_byte(dev, CTRL_REG_1, reg); } static struct device_operations pcf8523c_ops = { .read_resources = noop_read_resources, .set_resources = noop_set_resources, .init = pcf8523_init, .final = pcf8523_final }; static void pcf8523_enable(struct device *dev) { dev->ops = &pcf8523c_ops; } struct chip_operations drivers_i2c_pcf8523_ops = { .name = "PCF8523", .enable_dev = pcf8523_enable };