--- /dev/null
+/*
+ * (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
+}
Code Review / kvmfornfv.git / blobdiff