drivers/rtc/mc146818.c - u-boot - Git at Google

 // SPDX-License-Identifier: GPL-2.0+
 /*
  * (C) Copyright 2001
  * Denis Peter MPL AG Switzerland. d.peter@mpl.ch
  */

 /*
  * Date & Time support for the MC146818 (PIXX4) RTC
  */

 #include <common.h>
 #include <command.h>
 #include <dm.h>
 #include <rtc.h>

 #if defined(CONFIG_X86) || defined(CONFIG_MALTA)
 #include <asm/io.h>
 #define in8(p) inb(p)
 #define out8(p, v) outb(v, p)
 #endif

 #if defined(CONFIG_CMD_DATE)

 /* Set this to 1 to clear the CMOS RAM */
 #define CLEAR_CMOS		0

 #define RTC_PORT_MC146818	CONFIG_SYS_ISA_IO_BASE_ADDRESS + 0x70
 #define RTC_SECONDS		0x00
 #define RTC_SECONDS_ALARM	0x01
 #define RTC_MINUTES		0x02
 #define RTC_MINUTES_ALARM	0x03
 #define RTC_HOURS		0x04
 #define RTC_HOURS_ALARM		0x05
 #define RTC_DAY_OF_WEEK		0x06
 #define RTC_DATE_OF_MONTH	0x07
 #define RTC_MONTH		0x08
 #define RTC_YEAR		0x09
 #define RTC_CONFIG_A		0x0a
 #define RTC_CONFIG_B		0x0b
 #define RTC_CONFIG_C		0x0c
 #define RTC_CONFIG_D		0x0d
 #define RTC_REG_SIZE		0x80

 #define RTC_CONFIG_A_REF_CLCK_32KHZ	(1 << 5)
 #define RTC_CONFIG_A_RATE_1024HZ	6

 #define RTC_CONFIG_B_24H		(1 << 1)

 #define RTC_CONFIG_D_VALID_RAM_AND_TIME	0x80

 static int mc146818_read8(int reg)
 {
 #ifdef CONFIG_SYS_RTC_REG_BASE_ADDR
 	return in8(CONFIG_SYS_RTC_REG_BASE_ADDR + reg);
 #else
 	int ofs = 0;

 	if (reg >= 128) {
 		ofs = 2;
 		reg -= 128;
 	}
 	out8(RTC_PORT_MC146818 + ofs, reg);

 	return in8(RTC_PORT_MC146818 + ofs + 1);
 #endif
 }

 static void mc146818_write8(int reg, uchar val)
 {
 #ifdef CONFIG_SYS_RTC_REG_BASE_ADDR
 	out8(CONFIG_SYS_RTC_REG_BASE_ADDR + reg, val);
 #else
 	int ofs = 0;

 	if (reg >= 128) {
 		ofs = 2;
 		reg -= 128;
 	}
 	out8(RTC_PORT_MC146818 + ofs, reg);
 	out8(RTC_PORT_MC146818 + ofs + 1, val);
 #endif
 }

 static int mc146818_get(struct rtc_time *tmp)
 {
 	uchar sec, min, hour, mday, wday, mon, year;

 	/* here check if rtc can be accessed */
 	while ((mc146818_read8(RTC_CONFIG_A) & 0x80) == 0x80)
 		;

 	sec	= mc146818_read8(RTC_SECONDS);
 	min	= mc146818_read8(RTC_MINUTES);
 	hour	= mc146818_read8(RTC_HOURS);
 	mday	= mc146818_read8(RTC_DATE_OF_MONTH);
 	wday	= mc146818_read8(RTC_DAY_OF_WEEK);
 	mon	= mc146818_read8(RTC_MONTH);
 	year	= mc146818_read8(RTC_YEAR);
 #ifdef RTC_DEBUG
 	printf("Get RTC year: %02x mon/cent: %02x mday: %02x wday: %02x hr: %02x min: %02x sec: %02x\n",
 	       year, mon, mday, wday, hour, min, sec);
 	printf("Alarms: mday: %02x hour: %02x min: %02x sec: %02x\n",
 	       mc146818_read8(RTC_CONFIG_D) & 0x3f,
 	       mc146818_read8(RTC_HOURS_ALARM),
 	       mc146818_read8(RTC_MINUTES_ALARM),
 	       mc146818_read8(RTC_SECONDS_ALARM));
 #endif
 	tmp->tm_sec  = bcd2bin(sec & 0x7f);
 	tmp->tm_min  = bcd2bin(min & 0x7f);
 	tmp->tm_hour = bcd2bin(hour & 0x3f);
 	tmp->tm_mday = bcd2bin(mday & 0x3f);
 	tmp->tm_mon  = bcd2bin(mon & 0x1f);
 	tmp->tm_year = bcd2bin(year);
 	tmp->tm_wday = bcd2bin(wday & 0x07);

 	if (tmp->tm_year < 70)
 		tmp->tm_year += 2000;
 	else
 		tmp->tm_year += 1900;

 	tmp->tm_yday = 0;
 	tmp->tm_isdst = 0;
 #ifdef RTC_DEBUG
 	printf("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);
 #endif

 	return 0;
 }

 static int mc146818_set(struct rtc_time *tmp)
 {
 #ifdef RTC_DEBUG
 	printf("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);
 #endif
 	/* Disable the RTC to update the regs */
 	mc146818_write8(RTC_CONFIG_B, 0x82);

 	mc146818_write8(RTC_YEAR, bin2bcd(tmp->tm_year % 100));
 	mc146818_write8(RTC_MONTH, bin2bcd(tmp->tm_mon));
 	mc146818_write8(RTC_DAY_OF_WEEK, bin2bcd(tmp->tm_wday));
 	mc146818_write8(RTC_DATE_OF_MONTH, bin2bcd(tmp->tm_mday));
 	mc146818_write8(RTC_HOURS, bin2bcd(tmp->tm_hour));
 	mc146818_write8(RTC_MINUTES, bin2bcd(tmp->tm_min));
 	mc146818_write8(RTC_SECONDS, bin2bcd(tmp->tm_sec));

 	/* Enable the RTC to update the regs */
 	mc146818_write8(RTC_CONFIG_B, 0x02);

 	return 0;
 }

 static void mc146818_reset(void)
 {
 	/* Disable the RTC to update the regs */
 	mc146818_write8(RTC_CONFIG_B, 0x82);

 	/* Normal OP */
 	mc146818_write8(RTC_CONFIG_A, 0x20);
 	mc146818_write8(RTC_CONFIG_B, 0x00);
 	mc146818_write8(RTC_CONFIG_B, 0x00);

 	/* Enable the RTC to update the regs */
 	mc146818_write8(RTC_CONFIG_B, 0x02);
 }

 static void mc146818_init(void)
 {
 #if CLEAR_CMOS
 	int i;

 	rtc_write8(RTC_SECONDS_ALARM, 0);
 	rtc_write8(RTC_MINUTES_ALARM, 0);
 	rtc_write8(RTC_HOURS_ALARM, 0);
 	for (i = RTC_CONFIG_A; i < RTC_REG_SIZE; i++)
 		rtc_write8(i, 0);
 	printf("RTC: zeroing CMOS RAM\n");
 #endif

 	/* Setup the real time clock */
 	mc146818_write8(RTC_CONFIG_B, RTC_CONFIG_B_24H);
 	/* Setup the frequency it operates at */
 	mc146818_write8(RTC_CONFIG_A, RTC_CONFIG_A_REF_CLCK_32KHZ |
 			RTC_CONFIG_A_RATE_1024HZ);
 	/* Ensure all reserved bits are 0 in register D */
 	mc146818_write8(RTC_CONFIG_D, RTC_CONFIG_D_VALID_RAM_AND_TIME);

 	/* Clear any pending interrupts */
 	mc146818_read8(RTC_CONFIG_C);
 }
 #endif /* CONFIG_CMD_DATE */

 #ifdef CONFIG_DM_RTC

 static int rtc_mc146818_get(struct udevice *dev, struct rtc_time *time)
 {
 	return mc146818_get(time);
 }

 static int rtc_mc146818_set(struct udevice *dev, const struct rtc_time *time)
 {
 	return mc146818_set((struct rtc_time *)time);
 }

 static int rtc_mc146818_reset(struct udevice *dev)
 {
 	mc146818_reset();

 	return 0;
 }

 static int rtc_mc146818_read8(struct udevice *dev, unsigned int reg)
 {
 	return mc146818_read8(reg);
 }

 static int rtc_mc146818_write8(struct udevice *dev, unsigned int reg, int val)
 {
 	mc146818_write8(reg, val);

 	return 0;
 }

 static int rtc_mc146818_probe(struct udevice *dev)
 {
 	mc146818_init();

 	return 0;
 }

 static const struct rtc_ops rtc_mc146818_ops = {
 	.get = rtc_mc146818_get,
 	.set = rtc_mc146818_set,
 	.reset = rtc_mc146818_reset,
 	.read8 = rtc_mc146818_read8,
 	.write8 = rtc_mc146818_write8,
 };

 static const struct udevice_id rtc_mc146818_ids[] = {
 	{ .compatible = "motorola,mc146818" },
 	{ }
 };

 U_BOOT_DRIVER(rtc_mc146818) = {
 	.name = "rtc_mc146818",
 	.id = UCLASS_RTC,
 	.of_match = rtc_mc146818_ids,
 	.probe = rtc_mc146818_probe,
 	.ops = &rtc_mc146818_ops,
 };

 #else /* !CONFIG_DM_RTC */

 int rtc_get(struct rtc_time *tmp)
 {
 	return mc146818_get(tmp);
 }

 int rtc_set(struct rtc_time *tmp)
 {
 	return mc146818_set(tmp);
 }

 void rtc_reset(void)
 {
 	mc146818_reset();
 }

 int rtc_read8(int reg)
 {
 	return mc146818_read8(reg);
 }

 void rtc_write8(int reg, uchar val)
 {
 	mc146818_write8(reg, val);
 }

 u32 rtc_read32(int reg)
 {
 	u32 value = 0;
 	int i;

 	for (i = 0; i < sizeof(value); i++)
 		value |= rtc_read8(reg + i) << (i << 3);

 	return value;
 }

 void rtc_write32(int reg, u32 value)
 {
 	int i;

 	for (i = 0; i < sizeof(value); i++)
 		rtc_write8(reg + i, (value >> (i << 3)) & 0xff);
 }

 void rtc_init(void)
 {
 	mc146818_init();
 }

 #endif /* CONFIG_DM_RTC */
	// SPDX-License-Identifier: GPL-2.0+
	/*
	* (C) Copyright 2001
	* Denis Peter MPL AG Switzerland. d.peter@mpl.ch
	*/

	/*
	* Date & Time support for the MC146818 (PIXX4) RTC
	*/

	#include <common.h>
	#include <command.h>
	#include <dm.h>
	#include <rtc.h>

	#if defined(CONFIG_X86) \|\| defined(CONFIG_MALTA)
	#include <asm/io.h>
	#define in8(p) inb(p)
	#define out8(p, v) outb(v, p)
	#endif

	#if defined(CONFIG_CMD_DATE)

	/* Set this to 1 to clear the CMOS RAM */
	#define CLEAR_CMOS 0

	#define RTC_PORT_MC146818 CONFIG_SYS_ISA_IO_BASE_ADDRESS + 0x70
	#define RTC_SECONDS 0x00
	#define RTC_SECONDS_ALARM 0x01
	#define RTC_MINUTES 0x02
	#define RTC_MINUTES_ALARM 0x03
	#define RTC_HOURS 0x04
	#define RTC_HOURS_ALARM 0x05
	#define RTC_DAY_OF_WEEK 0x06
	#define RTC_DATE_OF_MONTH 0x07
	#define RTC_MONTH 0x08
	#define RTC_YEAR 0x09
	#define RTC_CONFIG_A 0x0a
	#define RTC_CONFIG_B 0x0b
	#define RTC_CONFIG_C 0x0c
	#define RTC_CONFIG_D 0x0d
	#define RTC_REG_SIZE 0x80

	#define RTC_CONFIG_A_REF_CLCK_32KHZ (1 << 5)
	#define RTC_CONFIG_A_RATE_1024HZ 6

	#define RTC_CONFIG_B_24H (1 << 1)

	#define RTC_CONFIG_D_VALID_RAM_AND_TIME 0x80

	static int mc146818_read8(int reg)
	{
	#ifdef CONFIG_SYS_RTC_REG_BASE_ADDR
	return in8(CONFIG_SYS_RTC_REG_BASE_ADDR + reg);
	#else
	int ofs = 0;

	if (reg >= 128) {
	ofs = 2;
	reg -= 128;
	}
	out8(RTC_PORT_MC146818 + ofs, reg);

	return in8(RTC_PORT_MC146818 + ofs + 1);
	#endif
	}

	static void mc146818_write8(int reg, uchar val)
	{
	#ifdef CONFIG_SYS_RTC_REG_BASE_ADDR
	out8(CONFIG_SYS_RTC_REG_BASE_ADDR + reg, val);
	#else
	int ofs = 0;

	if (reg >= 128) {
	ofs = 2;
	reg -= 128;
	}
	out8(RTC_PORT_MC146818 + ofs, reg);
	out8(RTC_PORT_MC146818 + ofs + 1, val);
	#endif
	}

	static int mc146818_get(struct rtc_time *tmp)
	{
	uchar sec, min, hour, mday, wday, mon, year;

	/* here check if rtc can be accessed */
	while ((mc146818_read8(RTC_CONFIG_A) & 0x80) == 0x80)
	;

	sec = mc146818_read8(RTC_SECONDS);
	min = mc146818_read8(RTC_MINUTES);
	hour = mc146818_read8(RTC_HOURS);
	mday = mc146818_read8(RTC_DATE_OF_MONTH);
	wday = mc146818_read8(RTC_DAY_OF_WEEK);
	mon = mc146818_read8(RTC_MONTH);
	year = mc146818_read8(RTC_YEAR);
	#ifdef RTC_DEBUG
	printf("Get RTC year: %02x mon/cent: %02x mday: %02x wday: %02x hr: %02x min: %02x sec: %02x\n",
	year, mon, mday, wday, hour, min, sec);
	printf("Alarms: mday: %02x hour: %02x min: %02x sec: %02x\n",
	mc146818_read8(RTC_CONFIG_D) & 0x3f,
	mc146818_read8(RTC_HOURS_ALARM),
	mc146818_read8(RTC_MINUTES_ALARM),
	mc146818_read8(RTC_SECONDS_ALARM));
	#endif
	tmp->tm_sec = bcd2bin(sec & 0x7f);
	tmp->tm_min = bcd2bin(min & 0x7f);
	tmp->tm_hour = bcd2bin(hour & 0x3f);
	tmp->tm_mday = bcd2bin(mday & 0x3f);
	tmp->tm_mon = bcd2bin(mon & 0x1f);
	tmp->tm_year = bcd2bin(year);
	tmp->tm_wday = bcd2bin(wday & 0x07);

	if (tmp->tm_year < 70)
	tmp->tm_year += 2000;
	else
	tmp->tm_year += 1900;

	tmp->tm_yday = 0;
	tmp->tm_isdst = 0;
	#ifdef RTC_DEBUG
	printf("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);
	#endif

	return 0;
	}

	static int mc146818_set(struct rtc_time *tmp)
	{
	#ifdef RTC_DEBUG
	printf("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);
	#endif
	/* Disable the RTC to update the regs */
	mc146818_write8(RTC_CONFIG_B, 0x82);

	mc146818_write8(RTC_YEAR, bin2bcd(tmp->tm_year % 100));
	mc146818_write8(RTC_MONTH, bin2bcd(tmp->tm_mon));
	mc146818_write8(RTC_DAY_OF_WEEK, bin2bcd(tmp->tm_wday));
	mc146818_write8(RTC_DATE_OF_MONTH, bin2bcd(tmp->tm_mday));
	mc146818_write8(RTC_HOURS, bin2bcd(tmp->tm_hour));
	mc146818_write8(RTC_MINUTES, bin2bcd(tmp->tm_min));
	mc146818_write8(RTC_SECONDS, bin2bcd(tmp->tm_sec));

	/* Enable the RTC to update the regs */
	mc146818_write8(RTC_CONFIG_B, 0x02);

	return 0;
	}

	static void mc146818_reset(void)
	{
	/* Disable the RTC to update the regs */
	mc146818_write8(RTC_CONFIG_B, 0x82);

	/* Normal OP */
	mc146818_write8(RTC_CONFIG_A, 0x20);
	mc146818_write8(RTC_CONFIG_B, 0x00);
	mc146818_write8(RTC_CONFIG_B, 0x00);

	/* Enable the RTC to update the regs */
	mc146818_write8(RTC_CONFIG_B, 0x02);
	}

	static void mc146818_init(void)
	{
	#if CLEAR_CMOS
	int i;

	rtc_write8(RTC_SECONDS_ALARM, 0);
	rtc_write8(RTC_MINUTES_ALARM, 0);
	rtc_write8(RTC_HOURS_ALARM, 0);
	for (i = RTC_CONFIG_A; i < RTC_REG_SIZE; i++)
	rtc_write8(i, 0);
	printf("RTC: zeroing CMOS RAM\n");
	#endif

	/* Setup the real time clock */
	mc146818_write8(RTC_CONFIG_B, RTC_CONFIG_B_24H);
	/* Setup the frequency it operates at */
	mc146818_write8(RTC_CONFIG_A, RTC_CONFIG_A_REF_CLCK_32KHZ \|
	RTC_CONFIG_A_RATE_1024HZ);
	/* Ensure all reserved bits are 0 in register D */
	mc146818_write8(RTC_CONFIG_D, RTC_CONFIG_D_VALID_RAM_AND_TIME);

	/* Clear any pending interrupts */
	mc146818_read8(RTC_CONFIG_C);
	}
	#endif /* CONFIG_CMD_DATE */

	#ifdef CONFIG_DM_RTC

	static int rtc_mc146818_get(struct udevice dev, struct rtc_time time)
	{
	return mc146818_get(time);
	}

	static int rtc_mc146818_set(struct udevice dev, const struct rtc_time time)
	{
	return mc146818_set((struct rtc_time *)time);
	}

	static int rtc_mc146818_reset(struct udevice *dev)
	{
	mc146818_reset();

	return 0;
	}

	static int rtc_mc146818_read8(struct udevice *dev, unsigned int reg)
	{
	return mc146818_read8(reg);
	}

	static int rtc_mc146818_write8(struct udevice *dev, unsigned int reg, int val)
	{
	mc146818_write8(reg, val);

	return 0;
	}

	static int rtc_mc146818_probe(struct udevice *dev)
	{
	mc146818_init();

	return 0;
	}

	static const struct rtc_ops rtc_mc146818_ops = {
	.get = rtc_mc146818_get,
	.set = rtc_mc146818_set,
	.reset = rtc_mc146818_reset,
	.read8 = rtc_mc146818_read8,
	.write8 = rtc_mc146818_write8,
	};

	static const struct udevice_id rtc_mc146818_ids[] = {
	{ .compatible = "motorola,mc146818" },
	{ }
	};

	U_BOOT_DRIVER(rtc_mc146818) = {
	.name = "rtc_mc146818",
	.id = UCLASS_RTC,
	.of_match = rtc_mc146818_ids,
	.probe = rtc_mc146818_probe,
	.ops = &rtc_mc146818_ops,
	};

	#else /* !CONFIG_DM_RTC */

	int rtc_get(struct rtc_time *tmp)
	{
	return mc146818_get(tmp);
	}

	int rtc_set(struct rtc_time *tmp)
	{
	return mc146818_set(tmp);
	}

	void rtc_reset(void)
	{
	mc146818_reset();
	}

	int rtc_read8(int reg)
	{
	return mc146818_read8(reg);
	}

	void rtc_write8(int reg, uchar val)
	{
	mc146818_write8(reg, val);
	}

	u32 rtc_read32(int reg)
	{
	u32 value = 0;
	int i;

	for (i = 0; i < sizeof(value); i++)
	value \|= rtc_read8(reg + i) << (i << 3);

	return value;
	}

	void rtc_write32(int reg, u32 value)
	{
	int i;

	for (i = 0; i < sizeof(value); i++)
	rtc_write8(reg + i, (value >> (i << 3)) & 0xff);
	}

	void rtc_init(void)
	{
	mc146818_init();
	}

	#endif /* CONFIG_DM_RTC */