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@ -25,6 +25,12 @@ |
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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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@ -42,6 +48,12 @@ |
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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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@ -113,6 +125,41 @@ int rtc_set( struct rtc_time *tmp ) |
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return 0; |
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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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int ret; |
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unsigned char reg_ctrl1; |
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ret = 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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ret = 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, ret; |
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unsigned char ctrl_status; |
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for (i = 0; i < loops; i++) { |
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ret = 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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int ret; |
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@ -121,4 +168,44 @@ void rtc_reset (void) |
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buf[0] = RTC_RV3029_CTRL_SYS_R; |
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ret = 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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ret = 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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ret = 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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