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- // SPDX-License-Identifier: GPL-2.0+
- /*
- * (C) Copyright 2007
- * Matthias Fuchs, esd gmbh, matthias.fuchs@esd-electronics.com.
- */
- /*
- * Epson RX8025 RTC driver.
- */
- #include <common.h>
- #include <command.h>
- #include <dm.h>
- #include <i2c.h>
- #include <rtc.h>
- /*---------------------------------------------------------------------*/
- #undef DEBUG_RTC
- #ifdef DEBUG_RTC
- #define DEBUGR(fmt,args...) printf(fmt ,##args)
- #else
- #define DEBUGR(fmt,args...)
- #endif
- /*---------------------------------------------------------------------*/
- #ifndef CONFIG_SYS_I2C_RTC_ADDR
- # define CONFIG_SYS_I2C_RTC_ADDR 0x32
- #endif
- #ifdef CONFIG_DM_RTC
- #define DEV_TYPE struct udevice
- #else
- /* Local udevice */
- struct ludevice {
- u8 chip;
- };
- #define DEV_TYPE struct ludevice
- #endif
- /*
- * RTC register addresses
- */
- #define RTC_SEC_REG_ADDR 0x00
- #define RTC_MIN_REG_ADDR 0x01
- #define RTC_HR_REG_ADDR 0x02
- #define RTC_DAY_REG_ADDR 0x03
- #define RTC_DATE_REG_ADDR 0x04
- #define RTC_MON_REG_ADDR 0x05
- #define RTC_YR_REG_ADDR 0x06
- #define RTC_CTL1_REG_ADDR 0x0e
- #define RTC_CTL2_REG_ADDR 0x0f
- /*
- * Control register 1 bits
- */
- #define RTC_CTL1_BIT_2412 0x20
- /*
- * Control register 2 bits
- */
- #define RTC_CTL2_BIT_PON 0x10
- #define RTC_CTL2_BIT_VDET 0x40
- #define RTC_CTL2_BIT_XST 0x20
- #define RTC_CTL2_BIT_VDSL 0x80
- /*
- * Note: the RX8025 I2C RTC requires register
- * reads and write to consist of a single bus
- * cycle. It is not allowed to write the register
- * address in a first cycle that is terminated by
- * a STOP condition. The chips needs a 'restart'
- * sequence (start sequence without a prior stop).
- * This driver has been written for a 4xx board.
- * U-Boot's 4xx i2c driver is currently not capable
- * to generate such cycles to some work arounds
- * are used.
- */
- /* static uchar rtc_read (uchar reg); */
- #ifdef CONFIG_DM_RTC
- /*
- * on mpc85xx based board with DM and offset len 1
- * accessing rtc works fine. May we can drop this ?
- */
- #define rtc_read(reg) buf[(reg) & 0xf]
- #else
- #define rtc_read(reg) buf[((reg) + 1) & 0xf]
- #endif
- static int rtc_write(DEV_TYPE *dev, uchar reg, uchar val);
- /*
- * Get the current time from the RTC
- */
- static int rx8025_rtc_get(DEV_TYPE *dev, struct rtc_time *tmp)
- {
- int rel = 0;
- uchar sec, min, hour, mday, wday, mon, year, ctl2;
- uchar buf[16];
- #ifdef CONFIG_DM_RTC
- if (dm_i2c_read(dev, 0, buf, sizeof(buf))) {
- #else
- if (i2c_read(dev->chip, 0, 0, buf, 16)) {
- #endif
- printf("Error reading from RTC\n");
- return -EIO;
- }
- sec = rtc_read(RTC_SEC_REG_ADDR);
- min = rtc_read(RTC_MIN_REG_ADDR);
- hour = rtc_read(RTC_HR_REG_ADDR);
- wday = rtc_read(RTC_DAY_REG_ADDR);
- mday = rtc_read(RTC_DATE_REG_ADDR);
- mon = rtc_read(RTC_MON_REG_ADDR);
- year = rtc_read(RTC_YR_REG_ADDR);
- DEBUGR("Get RTC year: %02x mon: %02x mday: %02x wday: %02x "
- "hr: %02x min: %02x sec: %02x\n",
- year, mon, mday, wday, hour, min, sec);
- /* dump status */
- ctl2 = rtc_read(RTC_CTL2_REG_ADDR);
- if (ctl2 & RTC_CTL2_BIT_PON) {
- printf("RTC: power-on detected\n");
- rel = -1;
- }
- if (ctl2 & RTC_CTL2_BIT_VDET) {
- printf("RTC: voltage drop detected\n");
- rel = -1;
- }
- if (!(ctl2 & RTC_CTL2_BIT_XST)) {
- printf("RTC: oscillator stop detected\n");
- rel = -1;
- }
- tmp->tm_sec = bcd2bin(sec & 0x7F);
- tmp->tm_min = bcd2bin(min & 0x7F);
- if (rtc_read(RTC_CTL1_REG_ADDR) & RTC_CTL1_BIT_2412)
- tmp->tm_hour = bcd2bin(hour & 0x3F);
- else
- tmp->tm_hour = bcd2bin(hour & 0x1F) % 12 +
- ((hour & 0x20) ? 12 : 0);
- tmp->tm_mday = bcd2bin (mday & 0x3F);
- tmp->tm_mon = bcd2bin (mon & 0x1F);
- tmp->tm_year = bcd2bin (year) + ( bcd2bin (year) >= 70 ? 1900 : 2000);
- tmp->tm_wday = bcd2bin (wday & 0x07);
- tmp->tm_yday = 0;
- tmp->tm_isdst= 0;
- DEBUGR("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 rel;
- }
- /*
- * Set the RTC
- */
- static int rx8025_rtc_set(DEV_TYPE *dev, const struct rtc_time *tmp)
- {
- DEBUGR("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 < 1970 || tmp->tm_year > 2069)
- printf("WARNING: year should be between 1970 and 2069!\n");
- if (rtc_write(dev, RTC_YR_REG_ADDR, bin2bcd(tmp->tm_year % 100)))
- return -EIO;
- if (rtc_write(dev, RTC_MON_REG_ADDR, bin2bcd(tmp->tm_mon)))
- return -EIO;
- if (rtc_write(dev, RTC_DAY_REG_ADDR, bin2bcd(tmp->tm_wday)))
- return -EIO;
- if (rtc_write(dev, RTC_DATE_REG_ADDR, bin2bcd(tmp->tm_mday)))
- return -EIO;
- if (rtc_write(dev, RTC_HR_REG_ADDR, bin2bcd(tmp->tm_hour)))
- return -EIO;
- if (rtc_write(dev, RTC_MIN_REG_ADDR, bin2bcd(tmp->tm_min)))
- return -EIO;
- if (rtc_write(dev, RTC_SEC_REG_ADDR, bin2bcd(tmp->tm_sec)))
- return -EIO;
- return rtc_write(dev, RTC_CTL1_REG_ADDR, RTC_CTL1_BIT_2412);
- }
- /*
- * Reset the RTC
- */
- static int rx8025_rtc_reset(DEV_TYPE *dev)
- {
- uchar buf[16];
- uchar ctl2;
- #ifdef CONFIG_DM_RTC
- if (dm_i2c_read(dev, 0, buf, sizeof(buf))) {
- #else
- if (i2c_read(dev->chip, 0, 0, buf, 16)) {
- #endif
- printf("Error reading from RTC\n");
- return -EIO;
- }
- ctl2 = rtc_read(RTC_CTL2_REG_ADDR);
- ctl2 &= ~(RTC_CTL2_BIT_PON | RTC_CTL2_BIT_VDET);
- ctl2 |= RTC_CTL2_BIT_XST | RTC_CTL2_BIT_VDSL;
- return rtc_write(dev, RTC_CTL2_REG_ADDR, ctl2);
- }
- /*
- * Helper functions
- */
- static int rtc_write(DEV_TYPE *dev, uchar reg, uchar val)
- {
- uchar buf[2];
- buf[0] = reg << 4;
- buf[1] = val;
- #ifdef CONFIG_DM_RTC
- if (dm_i2c_write(dev, 0, buf, 2)) {
- #else
- if (i2c_write(dev->chip, 0, 0, buf, 2) != 0) {
- #endif
- printf("Error writing to RTC\n");
- return -EIO;
- }
- return 0;
- }
- #ifdef CONFIG_DM_RTC
- static int rx8025_probe(struct udevice *dev)
- {
- uchar buf[16];
- int ret = 0;
- if (i2c_get_chip_offset_len(dev) != 1)
- ret = i2c_set_chip_offset_len(dev, 1);
- if (ret)
- return ret;
- return dm_i2c_read(dev, 0, buf, sizeof(buf));
- }
- static const struct rtc_ops rx8025_rtc_ops = {
- .get = rx8025_rtc_get,
- .set = rx8025_rtc_set,
- .reset = rx8025_rtc_reset,
- };
- static const struct udevice_id rx8025_rtc_ids[] = {
- { .compatible = "epson,rx8025" },
- { }
- };
- U_BOOT_DRIVER(rx8010sj_rtc) = {
- .name = "rx8025_rtc",
- .id = UCLASS_RTC,
- .probe = rx8025_probe,
- .of_match = rx8025_rtc_ids,
- .ops = &rx8025_rtc_ops,
- };
- #else
- int rtc_get(struct rtc_time *tm)
- {
- struct ludevice dev = {
- .chip = CONFIG_SYS_I2C_RTC_ADDR,
- };
- return rx8025_rtc_get(&dev, tm);
- }
- int rtc_set(struct rtc_time *tm)
- {
- struct ludevice dev = {
- .chip = CONFIG_SYS_I2C_RTC_ADDR,
- };
- return rx8025_rtc_set(&dev, tm);
- }
- void rtc_reset(void)
- {
- struct ludevice dev = {
- .chip = CONFIG_SYS_I2C_RTC_ADDR,
- };
- rx8025_rtc_reset(&dev);
- }
- #endif
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