drivers/rtc/rx8025.c - u-boot-mtk - Git at Google

 // 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
	// 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