| /* SPDX-License-Identifier: GPL-2.0-only */ |
| |
| #include <commonlib/bsd/bcd.h> |
| #include <console/console.h> |
| #include <delay.h> |
| #include <device/device.h> |
| #include <device/i2c.h> |
| #include <device/i2c_bus.h> |
| #include <timer.h> |
| #include <types.h> |
| #include <version.h> |
| #include "chip.h" |
| #include "rv3028c7.h" |
| |
| static enum cb_err rtc_eep_wait_ready(struct device *dev) |
| { |
| struct stopwatch sw; |
| uint8_t status; |
| |
| stopwatch_init_msecs_expire(&sw, EEP_SYNC_TIMEOUT_MS); |
| do { |
| status = (uint8_t)i2c_dev_readb_at(dev, STATUS_REG); |
| mdelay(1); |
| } while ((status & EE_BUSY_BIT) && !stopwatch_expired(&sw)); |
| |
| if (status & EE_BUSY_BIT) { |
| return CB_ERR; |
| } else { |
| return CB_SUCCESS; |
| } |
| } |
| |
| static enum cb_err rtc_eep_auto_refresh(struct device *dev, uint8_t state) |
| { |
| uint8_t reg; |
| |
| reg = (uint8_t)i2c_dev_readb_at(dev, CTRL1_REG); |
| reg &= ~EERD_BIT; |
| if (state == EEP_REFRESH_DIS) |
| reg |= EERD_BIT; |
| i2c_dev_writeb_at(dev, CTRL1_REG, reg); |
| /* Wait until the EEPROM has finished a possible running operation. */ |
| if (rtc_eep_wait_ready(dev) != CB_SUCCESS) { |
| printk(BIOS_ERR, "%s: EEPROM access timed out (%d ms)!\n", |
| dev->chip_ops->name, EEP_SYNC_TIMEOUT_MS); |
| return CB_ERR; |
| } |
| return CB_SUCCESS; |
| } |
| |
| static enum cb_err rtc_eep_start_update(struct device *dev) |
| { |
| /* Disable EEPROM auto refresh before writing RAM to EEPROM |
| to avoid race conditions. */ |
| if (rtc_eep_auto_refresh(dev, EEP_REFRESH_DIS)) |
| return CB_ERR; |
| |
| /* Now start the update cycle.*/ |
| i2c_dev_writeb_at(dev, EEP_CMD_REG, EEP_CMD_PREFIX); |
| i2c_dev_writeb_at(dev, EEP_CMD_REG, EEP_CMD_UPDATE); |
| return CB_SUCCESS; |
| } |
| |
| static void rtc_set_time_date(struct device *dev) |
| { |
| struct drivers_i2c_rv3028c7_config *config = dev->chip_info; |
| uint8_t buf[7]; |
| |
| /* The buffer contains the seconds through years of the new time and date. |
| Whenever a new date is set, the time is set to 00:00:00. */ |
| buf[0] = 0; /* Entry for seconds. */ |
| buf[1] = 0; /* Entry for minutes. */ |
| buf[2] = 0; /* Entry for hours. */ |
| if (config->set_user_date) { |
| buf[3] = config->user_weekday; |
| buf[4] = bin2bcd(config->user_day); |
| buf[5] = bin2bcd(config->user_month); |
| buf[6] = bin2bcd(config->user_year); |
| printk(BIOS_DEBUG, "%s: Set to user date\n", dev->chip_ops->name); |
| } else { |
| buf[3] = coreboot_build_date.weekday; |
| buf[4] = coreboot_build_date.day; |
| buf[5] = coreboot_build_date.month; |
| buf[6] = coreboot_build_date.year; |
| printk(BIOS_DEBUG, "%s: Set to coreboot build date\n", dev->chip_ops->name); |
| } |
| /* According to the datasheet, date and time should be transferred in "one go" |
| in order to avoid value corruption. */ |
| if (i2c_dev_write_at(dev, buf, sizeof(buf), 0) != sizeof(buf)) { |
| printk(BIOS_ERR, "%s: Not able to set date and time!\n", dev->chip_ops->name); |
| } |
| } |
| |
| static void rtc_final(struct device *dev) |
| { |
| uint8_t buf[7]; |
| |
| /* Read back current RTC date and time and print it to the console. |
| Date and time are read in "one go", the buffer contains seconds (byte 0) |
| through years (byte 6) after this read. */ |
| if (i2c_dev_read_at(dev, buf, sizeof(buf), 0) != sizeof(buf)) { |
| printk(BIOS_ERR, "%s: Not able to read current date and time!\n", |
| dev->chip_ops->name); |
| } else { |
| printk(BIOS_INFO, "%s: Current date %02d.%02d.%02d %02d:%02d:%02d\n", |
| dev->chip_ops->name, bcd2bin(buf[5]), bcd2bin(buf[4]), |
| bcd2bin(buf[6]), bcd2bin(buf[2]), bcd2bin(buf[1]), |
| bcd2bin(buf[0])); |
| } |
| /* Make sure the EEPROM automatic refresh is enabled. */ |
| if (rtc_eep_auto_refresh(dev, EEP_REFRESH_EN) != CB_SUCCESS) { |
| printk(BIOS_ERR, "%s: Not able to enable EEPROM auto refresh!\n", |
| dev->chip_ops->name); |
| } |
| } |
| |
| static void rtc_init(struct device *dev) |
| { |
| struct drivers_i2c_rv3028c7_config *config = dev->chip_info; |
| uint8_t reg, backup_reg, eep_update_needed = 0; |
| |
| /* On every startup, the RTC synchronizes the internal EEPROM with RAM. |
| * During this time no operation shall modify RAM registers. Ensure this |
| * sync is finished before starting the initialization. */ |
| if (rtc_eep_wait_ready(dev) != CB_SUCCESS) { |
| printk(BIOS_WARNING, "%s: Timeout on EEPROM sync after power on!\n", |
| dev->chip_ops->name); |
| return; |
| } |
| reg = backup_reg = (uint8_t)i2c_dev_readb_at(dev, EEP_BACKUP_REG); |
| /* Configure the switch-over setting according to devicetree. */ |
| if (config->bckup_sw_mode) { |
| reg &= ~BSM_MASK; |
| reg |= config->bckup_sw_mode << BSM_BIT; |
| } |
| /* Configure the VBACKUP charging mode. */ |
| if (config->cap_charge) { |
| reg &= ~TCR_MASK; |
| reg |= ((config->cap_charge - 1) << TCR_BIT); |
| reg |= TCE_BIT; |
| } else { |
| reg &= ~TCE_BIT; |
| } |
| /* According to the datasheet the Fast Edge Detection Enable (FEDE) bit |
| should always be set. */ |
| reg |= FEDE_BIT; |
| if (reg != backup_reg) { |
| /* Write new register value into shadow RAM and request an EEPROM update. */ |
| i2c_dev_writeb_at(dev, EEP_BACKUP_REG, reg); |
| eep_update_needed = 1; |
| } |
| /* Make sure the hour register is in 24h format.*/ |
| reg = (uint8_t)i2c_dev_readb_at(dev, CTRL2_REG); |
| if (reg & HOUR_12_24_BIT) { |
| reg &= ~HOUR_12_24_BIT; |
| i2c_dev_writeb_at(dev, CTRL2_REG, reg); |
| } |
| /* Check for a possible voltage drop event. */ |
| reg = (uint8_t)i2c_dev_readb_at(dev, STATUS_REG); |
| if (reg & PORF_BIT) { |
| /* Voltage drop was detected, date and time needs to be set properly. */ |
| rtc_set_time_date(dev); |
| /* Clear the PORF bit to mark that the event was handled. */ |
| reg &= ~PORF_BIT; |
| i2c_dev_writeb_at(dev, STATUS_REG, reg); |
| } |
| /* |
| * Finally, trigger the EEPROM update procedure if needed. |
| * According to the datasheet, this update will consume ~63 ms. |
| * In order to not block the boot process here waiting for this update being finished, |
| * trigger the update now and check for readiness in the final hook. |
| */ |
| if (eep_update_needed && rtc_eep_start_update(dev) != CB_SUCCESS) { |
| printk(BIOS_ERR, "%s: Not able to trigger EEPROM update!\n", |
| dev->chip_ops->name); |
| } |
| } |
| |
| static struct device_operations rv3028c7_ops = { |
| .read_resources = noop_read_resources, |
| .set_resources = noop_set_resources, |
| .init = rtc_init, |
| .final = rtc_final, |
| }; |
| |
| static void rtc_enable(struct device *dev) |
| { |
| dev->ops = &rv3028c7_ops; |
| } |
| |
| struct chip_operations drivers_i2c_rv3028c7_ops = { |
| CHIP_NAME("RV-3028-C7") |
| .enable_dev = rtc_enable |
| }; |