| /* |
| * This file is part of the coreboot project. |
| * |
| * Copyright 2016 Siemens 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 <device/smbus.h> |
| #include <version.h> |
| #include <console/console.h> |
| #include <bcd.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; |
| smbus_write_byte(dev, CTRL_REG_1, reg); |
| reg = smbus_read_byte(dev, CTRL_REG_3); |
| reg &= ~PM_MASK; |
| reg |= config->power_mode; |
| smbus_write_byte(dev, CTRL_REG_3, reg); |
| reg = smbus_read_byte(dev, TMR_CLKOUT_REG); |
| reg &= ~COF_MASK; |
| reg |= config->cof_selection; |
| 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 & 0x03) << 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 & 0x38) << 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 = DEVICE_NOOP, |
| .set_resources = DEVICE_NOOP, |
| .enable_resources = DEVICE_NOOP, |
| .init = pcf8523_init, |
| .final = pcf8523_final |
| }; |
| |
| static void pcf8523_enable(struct device *dev) |
| { |
| dev->ops = &pcf8523c_ops; |
| } |
| |
| struct chip_operations drivers_i2c_pcf8523_ops = { |
| CHIP_NAME("PCF8523") |
| .enable_dev = pcf8523_enable |
| }; |