From 5fb66adc323cba3f23cd668d6d2d1cb586724f0e Mon Sep 17 00:00:00 2001 From: Werner Zeh Date: Fri, 26 Aug 2022 13:40:47 +0200 Subject: drivers/i2c: Add a new RTC RV-3028-C7 from Micro Crystal This patch adds a driver for a new RTC from Micro Crystal. Supported features are: * configure backup voltage switchover via devicetree * configure backup capacitor charging mode via devicetree * set date if a voltage drop on backup voltage was detected to either a user definable (devicetree) or coreboot build date Change-Id: I37176ea726e50e4e74d409488981d7618ecff8bb Signed-off-by: Werner Zeh Reviewed-on: https://review.coreboot.org/c/coreboot/+/67099 Tested-by: build bot (Jenkins) Reviewed-by: Mario Scheithauer --- src/drivers/i2c/rv3028c7/rv3028c7.h | 42 +++++++++++++++++++++++++++++++++++++ 1 file changed, 42 insertions(+) create mode 100644 src/drivers/i2c/rv3028c7/rv3028c7.h (limited to 'src/drivers/i2c/rv3028c7/rv3028c7.h') diff --git a/src/drivers/i2c/rv3028c7/rv3028c7.h b/src/drivers/i2c/rv3028c7/rv3028c7.h new file mode 100644 index 0000000000..55617a724f --- /dev/null +++ b/src/drivers/i2c/rv3028c7/rv3028c7.h @@ -0,0 +1,42 @@ +/* SPDX-License-Identifier: GPL-2.0-only */ + +#ifndef _I2C_RV3028C7_H_ +#define _I2C_RV3028C7_H_ + +/* Register layout */ +#define SECOND_REG 0x00 +#define MINUTE_REG 0x01 +#define HOUR_REG 0x02 +#define WEEK_REG 0x03 +#define DAY_REG 0x04 +#define MONTH_REG 0x05 +#define YEAR_REG 0x06 +#define STATUS_REG 0x0e +#define PORF_BIT (1 << 0) +#define EE_BUSY_BIT (1 << 7) +#define CTRL1_REG 0x0f +#define EERD_BIT (1 << 3) +#define CTRL2_REG 0x10 +#define HOUR_12_24_BIT (1 << 1) +/* Registers for the internal EEPROM */ +#define EEP_ADR_REG 0x25 +#define EEP_DATA_REG 0x26 +#define EEP_CMD_REG 0x27 +#define EEP_CMD_PREFIX 0x00 +#define EEP_CMD_UPDATE 0x11 +#define EEP_BACKUP_REG 0x37 +#define FEDE_BIT (1 << 4) +#define BSM_BIT 2 +#define BSM_MASK (3 << BSM_BIT) +#define TCR_BIT 0 +#define TCR_MASK (3 << TCR_BIT) +#define TCE_BIT (1 << 5) + +#define EEP_REFRESH_EN 1 +#define EEP_REFRESH_DIS 0 + +/* The longest mentioned timeout in the datasheet is 63 ms, + round up to 70 ms to be on the safe side. */ +#define EEP_SYNC_TIMEOUT_MS 70 + +#endif /* _I2C_RV3028C7_H_ */ -- cgit v1.2.3