diff options
Diffstat (limited to 'src/roms/u-boot/drivers/rtc/rv3029.c')
| -rw-r--r-- | src/roms/u-boot/drivers/rtc/rv3029.c | 190 |
1 files changed, 190 insertions, 0 deletions
diff --git a/src/roms/u-boot/drivers/rtc/rv3029.c b/src/roms/u-boot/drivers/rtc/rv3029.c new file mode 100644 index 0000000..f08040a --- /dev/null +++ b/src/roms/u-boot/drivers/rtc/rv3029.c @@ -0,0 +1,190 @@ +/* + * (C) Copyright 2010 + * Heiko Schocher, DENX Software Engineering, hs@denx.de + * + * SPDX-License-Identifier: GPL-2.0+ + */ +#include <common.h> +#include <command.h> +#include <i2c.h> +#include <rtc.h> + +#define RTC_RV3029_CTRL1 0x00 +#define RTC_RV3029_CTRL1_EERE (1 << 3) + +#define RTC_RV3029_CTRL_STATUS 0x03 +#define RTC_RV3029_CTRLS_EEBUSY (1 << 7) + +#define RTC_RV3029_CTRL_RESET 0x04 +#define RTC_RV3029_CTRL_SYS_R (1 << 4) + +#define RTC_RV3029_CLOCK_PAGE 0x08 +#define RTC_RV3029_PAGE_LEN 7 + +#define RV3029C2_W_SECONDS 0x00 +#define RV3029C2_W_MINUTES 0x01 +#define RV3029C2_W_HOURS 0x02 +#define RV3029C2_W_DATE 0x03 +#define RV3029C2_W_DAYS 0x04 +#define RV3029C2_W_MONTHS 0x05 +#define RV3029C2_W_YEARS 0x06 + +#define RV3029C2_REG_HR_12_24 (1 << 6) /* 24h/12h mode */ +#define RV3029C2_REG_HR_PM (1 << 5) /* PM/AM bit in 12h mode */ + +#define RTC_RV3029_EEPROM_CTRL 0x30 +#define RTC_RV3029_TRICKLE_1K (1 << 4) +#define RTC_RV3029_TRICKLE_5K (1 << 5) +#define RTC_RV3029_TRICKLE_20K (1 << 6) +#define RTC_RV3029_TRICKLE_80K (1 << 7) + +int rtc_get( struct rtc_time *tmp ) +{ + int ret; + unsigned char buf[RTC_RV3029_PAGE_LEN]; + + ret = i2c_read(CONFIG_SYS_I2C_RTC_ADDR, RTC_RV3029_CLOCK_PAGE, 1, buf, \ + RTC_RV3029_PAGE_LEN); + if (ret) { + printf("%s: error reading RTC: %x\n", __func__, ret); + return -1; + } + tmp->tm_sec = bcd2bin( buf[RV3029C2_W_SECONDS] & 0x7f); + tmp->tm_min = bcd2bin( buf[RV3029C2_W_MINUTES] & 0x7f); + if (buf[RV3029C2_W_HOURS] & RV3029C2_REG_HR_12_24) { + /* 12h format */ + tmp->tm_hour = bcd2bin(buf[RV3029C2_W_HOURS] & 0x1f); + if (buf[RV3029C2_W_HOURS] & RV3029C2_REG_HR_PM) + /* PM flag set */ + tmp->tm_hour += 12; + } else + tmp->tm_hour = bcd2bin(buf[RV3029C2_W_HOURS] & 0x3f); + + tmp->tm_mday = bcd2bin( buf[RV3029C2_W_DATE] & 0x3F ); + tmp->tm_mon = bcd2bin( buf[RV3029C2_W_MONTHS] & 0x1F ); + tmp->tm_wday = bcd2bin( buf[RV3029C2_W_DAYS] & 0x07 ); + /* RTC supports only years > 1999 */ + tmp->tm_year = bcd2bin( buf[RV3029C2_W_YEARS]) + 2000; + tmp->tm_yday = 0; + tmp->tm_isdst = 0; + + debug( "Get DATE: %4d-%02d-%02d (wday=%d) TIME: %2d:%02d:%02d\n", + tmp->tm_year, tmp->tm_mon, tmp->tm_mday, tmp->tm_wday, + tmp->tm_hour, tmp->tm_min, tmp->tm_sec ); + + return 0; +} + +int rtc_set( struct rtc_time *tmp ) +{ + int ret; + unsigned char buf[RTC_RV3029_PAGE_LEN]; + + debug( "Set DATE: %4d-%02d-%02d (wday=%d) TIME: %2d:%02d:%02d\n", + tmp->tm_year, tmp->tm_mon, tmp->tm_mday, tmp->tm_wday, + tmp->tm_hour, tmp->tm_min, tmp->tm_sec); + + if (tmp->tm_year < 2000) { + printf("RTC: year %d < 2000 not possible\n", tmp->tm_year); + return -1; + } + buf[RV3029C2_W_SECONDS] = bin2bcd(tmp->tm_sec); + buf[RV3029C2_W_MINUTES] = bin2bcd(tmp->tm_min); + buf[RV3029C2_W_HOURS] = bin2bcd(tmp->tm_hour); + /* set 24h format */ + buf[RV3029C2_W_HOURS] &= ~RV3029C2_REG_HR_12_24; + buf[RV3029C2_W_DATE] = bin2bcd(tmp->tm_mday); + buf[RV3029C2_W_DAYS] = bin2bcd(tmp->tm_wday); + buf[RV3029C2_W_MONTHS] = bin2bcd(tmp->tm_mon); + tmp->tm_year -= 2000; + buf[RV3029C2_W_YEARS] = bin2bcd(tmp->tm_year); + ret = i2c_write(CONFIG_SYS_I2C_RTC_ADDR, RTC_RV3029_CLOCK_PAGE, 1, + buf, RTC_RV3029_PAGE_LEN); + + /* give the RTC some time to update */ + udelay(1000); + return ret; +} + +/* sets EERE-Bit (automatic EEPROM refresh) */ +static void set_eere_bit(int state) +{ + unsigned char reg_ctrl1; + + (void)i2c_read(CONFIG_SYS_I2C_RTC_ADDR, RTC_RV3029_CTRL1, 1, + ®_ctrl1, 1); + + if (state) + reg_ctrl1 |= RTC_RV3029_CTRL1_EERE; + else + reg_ctrl1 &= (~RTC_RV3029_CTRL1_EERE); + + (void)i2c_write(CONFIG_SYS_I2C_RTC_ADDR, RTC_RV3029_CTRL1, 1, + ®_ctrl1, 1); +} + +/* waits until EEPROM page is no longer busy (times out after 10ms*loops) */ +static int wait_eebusy(int loops) +{ + int i; + unsigned char ctrl_status; + + for (i = 0; i < loops; i++) { + (void)i2c_read(CONFIG_SYS_I2C_RTC_ADDR, RTC_RV3029_CTRL_STATUS, + 1, &ctrl_status, 1); + + if ((ctrl_status & RTC_RV3029_CTRLS_EEBUSY) == 0) + break; + udelay(10000); + } + return i; +} + +void rtc_reset (void) +{ + unsigned char buf[RTC_RV3029_PAGE_LEN]; + + buf[0] = RTC_RV3029_CTRL_SYS_R; + (void)i2c_write(CONFIG_SYS_I2C_RTC_ADDR, RTC_RV3029_CTRL_RESET, 1, + buf, 1); + +#if defined(CONFIG_SYS_RV3029_TCR) + /* + * because EEPROM_CTRL register is in EEPROM page it is necessary to + * disable automatic EEPROM refresh and check if EEPROM is busy + * before EEPORM_CTRL register may be accessed + */ + set_eere_bit(0); + wait_eebusy(100); + /* read current trickle charger setting */ + (void)i2c_read(CONFIG_SYS_I2C_RTC_ADDR, RTC_RV3029_EEPROM_CTRL, + 1, buf, 1); + /* enable automatic EEPROM refresh again */ + set_eere_bit(1); + + /* + * to minimize EEPROM access write trickle charger setting only if it + * differs from current value + */ + if ((buf[0] & 0xF0) != CONFIG_SYS_RV3029_TCR) { + buf[0] = (buf[0] & 0x0F) | CONFIG_SYS_RV3029_TCR; + /* + * write trickle charger setting (disable autom. EEPROM + * refresh and wait until EEPROM is idle) + */ + set_eere_bit(0); + wait_eebusy(100); + (void)i2c_write(CONFIG_SYS_I2C_RTC_ADDR, + RTC_RV3029_EEPROM_CTRL, 1, buf, 1); + /* + * it is necessary to wait 10ms before EEBUSY-Bit may be read + * (this is not documented in the data sheet yet, but the + * manufacturer recommends it) + */ + udelay(10000); + /* wait until EEPROM write access is finished */ + wait_eebusy(100); + set_eere_bit(1); + } +#endif +} |
