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