a39aedec9d
Some Siemens copyright entries incorrectly contain a dot at the end of the line. This is fixed with this patch. Change-Id: I8d98f9a7caad65f7d14c3c2a0de67cb636340116 Signed-off-by: Mario Scheithauer <mario.scheithauer@siemens.com> Reviewed-on: https://review.coreboot.org/22355 Tested-by: build bot (Jenkins) <no-reply@coreboot.org> Reviewed-by: Martin Roth <martinroth@google.com> Reviewed-by: Patrick Georgi <pgeorgi@google.com>
148 lines
5 KiB
C
148 lines
5 KiB
C
/*
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* This file is part of the coreboot project.
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*
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* Copyright (C) 2016 Siemens AG
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; version 2 of the License.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*/
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#include <device/smbus.h>
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#include <version.h>
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#include <console/console.h>
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#include <bcd.h>
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#include "chip.h"
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/* Set RTC date from coreboot build date. */
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static void pcf8523_set_build_date(struct device *dev)
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{
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smbus_write_byte(dev, YEAR_REG, coreboot_build_date.year);
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smbus_write_byte(dev, MONTH_REG, coreboot_build_date.month);
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smbus_write_byte(dev, WEEKDAY_REG, coreboot_build_date.weekday);
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smbus_write_byte(dev, DAY_REG, coreboot_build_date.day);
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}
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/* Set RTC date from user defined date (available in e.g. device tree). */
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static void pcf8523_set_user_date(struct device *dev)
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{
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struct drivers_i2c_pcf8523_config *config = dev->chip_info;
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smbus_write_byte(dev, YEAR_REG, bin2bcd(config->user_year));
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smbus_write_byte(dev, MONTH_REG, bin2bcd(config->user_month));
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smbus_write_byte(dev, DAY_REG, bin2bcd(config->user_day));
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smbus_write_byte(dev, WEEKDAY_REG, bin2bcd(config->user_weekday));
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}
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static void pcf8523_final(struct device *dev)
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{
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/* Read back current RTC date and time and print it to the console. */
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printk(BIOS_INFO, "%s: Current date %02d.%02d.%02d %02d:%02d:%02d\n",
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dev->chip_ops->name,
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bcd2bin(smbus_read_byte(dev, MONTH_REG)),
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bcd2bin(smbus_read_byte(dev, DAY_REG)),
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bcd2bin(smbus_read_byte(dev, YEAR_REG)),
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bcd2bin(smbus_read_byte(dev, HOUR_REG)),
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bcd2bin(smbus_read_byte(dev, MINUTE_REG)),
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bcd2bin(smbus_read_byte(dev, SECOND_REG)) & ~OS_BIT);
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}
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static void pcf8523_init(struct device *dev)
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{
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struct drivers_i2c_pcf8523_config *config = dev->chip_info;
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uint8_t reg = 0;
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if (!(smbus_read_byte(dev, SECOND_REG) & OS_BIT)) {
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/* Set control registers to a known good value even if no
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* power loss event was recognized. There were issues with
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* this RTC in the past where control registers were
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* corrupted and OS bit was not set. */
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reg = smbus_read_byte(dev, CTRL_REG_1);
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reg &= ~(STOP_BIT | CAP_SEL);
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reg |= ((!!config->cap_sel) << 7);
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smbus_write_byte(dev, CTRL_REG_1, reg);
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reg = smbus_read_byte(dev, CTRL_REG_3);
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reg &= ~PM_MASK;
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reg |= ((config->power_mode & 0x07) << 5);
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smbus_write_byte(dev, CTRL_REG_3, reg);
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reg = smbus_read_byte(dev, TMR_CLKOUT_REG);
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reg &= ~COF_MASK;
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reg |= ((config->cof_selection & 0x07) << 3);
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smbus_write_byte(dev, TMR_CLKOUT_REG, reg);
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return;
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}
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/* Initialize the RTC fully only if a power-loss event was recognized.
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* In this case RTC will be set up with default date and time. */
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smbus_write_byte(dev, CTRL_REG_1, ((!!config->cap_sel) << 7) |
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((!!config->second_int_en) << 2) |
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((!!config->alarm_int_en) << 1) |
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(!!config->correction_int_en));
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smbus_write_byte(dev, CTRL_REG_2, ((!!config->wdt_int_en) << 2) |
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((!!config->tmrA_int_en) << 1) |
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(!!config->tmrB_int_en));
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smbus_write_byte(dev, CTRL_REG_3, ((config->power_mode & 0x07) << 5) |
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((!!config->bat_switch_int_en) << 1) |
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(!!config->bat_low_int_en));
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smbus_write_byte(dev, OFFSET_REG, ((!!config->offset_mode) << 7) |
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(config->offset_val & 0x7f));
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smbus_write_byte(dev, TMR_CLKOUT_REG, ((!!config->tmrA_int_mode) << 7) |
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((!!config->tmrB_int_mode) << 6) |
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((config->cof_selection & 0x07) << 3) |
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((config->tmrA_mode & 0x03) << 1) |
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(!!config->tmrB_mode));
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smbus_write_byte(dev, TMR_A_FREQ_REG, (config->tmrA_prescaler & 0x7));
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smbus_write_byte(dev, TMR_B_FREQ_REG, (config->tmrB_prescaler & 0x7) |
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((config->tmrB_pulse_cfg & 0x7) << 4));
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/* Before setting the clock stop oscillator. */
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reg = smbus_read_byte(dev, CTRL_REG_1);
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reg |= STOP_BIT;
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smbus_write_byte(dev, CTRL_REG_1, reg);
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if (config->set_user_date) {
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/* Set user date defined in device tree. */
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printk(BIOS_DEBUG, "%s: Set to user date\n",
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dev->chip_ops->name);
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pcf8523_set_user_date(dev);
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} else {
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/* Set date from coreboot build. */
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printk(BIOS_DEBUG, "%s: Set to coreboot build date\n",
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dev->chip_ops->name);
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pcf8523_set_build_date(dev);
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}
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/* Set time to 01:00:00 */
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smbus_write_byte(dev, HOUR_REG, 1);
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smbus_write_byte(dev, MINUTE_REG, 0);
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smbus_write_byte(dev, SECOND_REG, 0);
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/* Start oscillator again as the clock is set up now */
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reg &= ~STOP_BIT;
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smbus_write_byte(dev, CTRL_REG_1, reg);
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}
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static struct device_operations pcf8523c_ops = {
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.read_resources = DEVICE_NOOP,
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.set_resources = DEVICE_NOOP,
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.enable_resources = DEVICE_NOOP,
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.init = pcf8523_init,
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.final = pcf8523_final
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};
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static void pcf8523_enable(struct device *dev)
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{
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dev->ops = &pcf8523c_ops;
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}
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struct chip_operations drivers_i2c_pcf8523_ops = {
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CHIP_NAME("PCF8523")
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.enable_dev = pcf8523_enable
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};
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