[J-u-boot.git] / drivers / rtc / davinci.c

// SPDX-License-Identifier: GPL-2.0+
/*
 * (C) Copyright 2011 DENX Software Engineering GmbH
 * Heiko Schocher <[email protected]>
 * Copyright (C) 2021 Dario Binacchi <[email protected]>
 */
#include <common.h>
#include <command.h>
#include <dm.h>
#include <clk.h>
#include <log.h>
#include <rtc.h>
#include <asm/io.h>
#include <dm/device_compat.h>
#include <linux/delay.h>

/* RTC registers */
#define OMAP_RTC_SECONDS_REG		0x00
#define OMAP_RTC_MINUTES_REG		0x04
#define OMAP_RTC_HOURS_REG		0x08
#define OMAP_RTC_DAYS_REG		0x0C
#define OMAP_RTC_MONTHS_REG		0x10
#define OMAP_RTC_YEARS_REG		0x14
#define OMAP_RTC_WEEKS_REG		0x18

#define OMAP_RTC_CTRL_REG		0x40
#define OMAP_RTC_STATUS_REG		0x44
#define OMAP_RTC_INTERRUPTS_REG		0x48

#define OMAP_RTC_OSC_REG		0x54

#define OMAP_RTC_SCRATCH0_REG		0x60
#define OMAP_RTC_SCRATCH1_REG		0x64
#define OMAP_RTC_SCRATCH2_REG		0x68

#define OMAP_RTC_KICK0_REG		0x6c
#define OMAP_RTC_KICK1_REG		0x70

#define OMAP_RTC_PMIC_REG		0x98

/* OMAP_RTC_CTRL_REG bit fields: */
#define OMAP_RTC_CTRL_SPLIT		BIT(7)
#define OMAP_RTC_CTRL_DISABLE		BIT(6)
#define OMAP_RTC_CTRL_SET_32_COUNTER	BIT(5)
#define OMAP_RTC_CTRL_TEST		BIT(4)
#define OMAP_RTC_CTRL_MODE_12_24	BIT(3)
#define OMAP_RTC_CTRL_AUTO_COMP		BIT(2)
#define OMAP_RTC_CTRL_ROUND_30S		BIT(1)
#define OMAP_RTC_CTRL_STOP		BIT(0)

/* OMAP_RTC_STATUS_REG bit fields */
#define OMAP_RTC_STATUS_POWER_UP	BIT(7)
#define OMAP_RTC_STATUS_ALARM2		BIT(7)
#define OMAP_RTC_STATUS_ALARM		BIT(6)
#define OMAP_RTC_STATUS_1D_EVENT	BIT(5)
#define OMAP_RTC_STATUS_1H_EVENT	BIT(4)
#define OMAP_RTC_STATUS_1M_EVENT	BIT(3)
#define OMAP_RTC_STATUS_1S_EVENT	BIT(2)
#define OMAP_RTC_STATUS_RUN		BIT(1)
#define OMAP_RTC_STATUS_BUSY		BIT(0)

/* OMAP_RTC_OSC_REG bit fields */
#define OMAP_RTC_OSC_32KCLK_EN		BIT(6)
#define OMAP_RTC_OSC_SEL_32KCLK_SRC	BIT(3)
#define OMAP_RTC_OSC_OSC32K_GZ_DISABLE	BIT(4)

/* OMAP_RTC_KICKER values */
#define	OMAP_RTC_KICK0_VALUE		0x83e70b13
#define	OMAP_RTC_KICK1_VALUE		0x95a4f1e0

struct omap_rtc_device_type {
	bool has_32kclk_en;
	bool has_irqwakeen;
	bool has_pmic_mode;
	bool has_power_up_reset;
};

struct omap_rtc_priv {
	fdt_addr_t base;
	u8 max_reg;
	struct udevice *dev;
	struct clk clk;
	bool has_ext_clk;
	const struct omap_rtc_device_type *type;
};

static inline u8 omap_rtc_readb(struct omap_rtc_priv *priv, unsigned int reg)
{
	return readb(priv->base + reg);
}

static inline u32 omap_rtc_readl(struct omap_rtc_priv *priv, unsigned int reg)
{
	return readl(priv->base + reg);
}

static inline void omap_rtc_writeb(struct omap_rtc_priv *priv, unsigned int reg,
				   u8 val)
{
	writeb(val, priv->base + reg);
}

static inline void omap_rtc_writel(struct omap_rtc_priv *priv, unsigned int reg,
				   u32 val)
{
	writel(val, priv->base + reg);
}

static inline void omap_rtc_unlock(struct omap_rtc_priv *priv)
{
	omap_rtc_writel(priv, OMAP_RTC_KICK0_REG, OMAP_RTC_KICK0_VALUE);
	omap_rtc_writel(priv, OMAP_RTC_KICK1_REG, OMAP_RTC_KICK1_VALUE);
}

static inline void omap_rtc_lock(struct omap_rtc_priv *priv)
{
	omap_rtc_writel(priv, OMAP_RTC_KICK0_REG, 0);
	omap_rtc_writel(priv, OMAP_RTC_KICK1_REG, 0);
}

static int omap_rtc_wait_not_busy(struct omap_rtc_priv *priv)
{
	int count;
	u8 status;

	status = omap_rtc_readb(priv, OMAP_RTC_STATUS_REG);
	if ((status & OMAP_RTC_STATUS_RUN) != OMAP_RTC_STATUS_RUN) {
		printf("RTC doesn't run\n");
		return -1;
	}

	/* BUSY may stay active for 1/32768 second (~30 usec) */
	for (count = 0; count < 50; count++) {
		if (!(status & OMAP_RTC_STATUS_BUSY))
			break;

		udelay(1);
		status = omap_rtc_readb(priv, OMAP_RTC_STATUS_REG);
	}

	/* now we have ~15 usec to read/write various registers */
	return 0;
}

static int omap_rtc_reset(struct udevice *dev)
{
	struct omap_rtc_priv *priv = dev_get_priv(dev);

	/* run RTC counter */
	omap_rtc_writeb(priv, OMAP_RTC_CTRL_REG, 0x01);
	return 0;
}

static int omap_rtc_set(struct udevice *dev, const struct rtc_time *tm)
{
	struct omap_rtc_priv *priv = dev_get_priv(dev);
	int ret;

	ret = omap_rtc_wait_not_busy(priv);
	if (ret)
		return ret;

	omap_rtc_unlock(priv);
	omap_rtc_writeb(priv, OMAP_RTC_YEARS_REG, bin2bcd(tm->tm_year % 100));
	omap_rtc_writeb(priv, OMAP_RTC_MONTHS_REG, bin2bcd(tm->tm_mon));
	omap_rtc_writeb(priv, OMAP_RTC_WEEKS_REG, bin2bcd(tm->tm_wday));
	omap_rtc_writeb(priv, OMAP_RTC_DAYS_REG, bin2bcd(tm->tm_mday));
	omap_rtc_writeb(priv, OMAP_RTC_HOURS_REG, bin2bcd(tm->tm_hour));
	omap_rtc_writeb(priv, OMAP_RTC_MINUTES_REG, bin2bcd(tm->tm_min));
	omap_rtc_writeb(priv, OMAP_RTC_SECONDS_REG, bin2bcd(tm->tm_sec));
	omap_rtc_lock(priv);

	dev_dbg(dev, "Set DATE: %4d-%02d-%02d (wday=%d)  TIME: %2d:%02d:%02d\n",
		tm->tm_year, tm->tm_mon, tm->tm_mday, tm->tm_wday, tm->tm_hour,
		tm->tm_min, tm->tm_sec);

	return 0;
}

static int omap_rtc_get(struct udevice *dev, struct rtc_time *tm)
{
	struct omap_rtc_priv *priv = dev_get_priv(dev);
	unsigned long sec, min, hour, mday, wday, mon_cent, year;
	int ret;

	ret = omap_rtc_wait_not_busy(priv);
	if (ret)
		return ret;

	sec = omap_rtc_readb(priv, OMAP_RTC_SECONDS_REG);
	min = omap_rtc_readb(priv, OMAP_RTC_MINUTES_REG);
	hour = omap_rtc_readb(priv, OMAP_RTC_HOURS_REG);
	mday = omap_rtc_readb(priv, OMAP_RTC_DAYS_REG);
	wday = omap_rtc_readb(priv, OMAP_RTC_WEEKS_REG);
	mon_cent = omap_rtc_readb(priv, OMAP_RTC_MONTHS_REG);
	year = omap_rtc_readb(priv, OMAP_RTC_YEARS_REG);

	dev_dbg(dev,
		"Get RTC year: %02lx mon/cent: %02lx mday: %02lx wday: %02lx "
		"hr: %02lx min: %02lx sec: %02lx\n",
		year, mon_cent, mday, wday,
		hour, min, sec);

	tm->tm_sec  = bcd2bin(sec  & 0x7F);
	tm->tm_min  = bcd2bin(min  & 0x7F);
	tm->tm_hour = bcd2bin(hour & 0x3F);
	tm->tm_mday = bcd2bin(mday & 0x3F);
	tm->tm_mon  = bcd2bin(mon_cent & 0x1F);
	tm->tm_year = bcd2bin(year) + 2000;
	tm->tm_wday = bcd2bin(wday & 0x07);
	tm->tm_yday = 0;
	tm->tm_isdst = 0;

	dev_dbg(dev, "Get DATE: %4d-%02d-%02d (wday=%d)  TIME: %2d:%02d:%02d\n",
		tm->tm_year, tm->tm_mon, tm->tm_mday, tm->tm_wday, tm->tm_hour,
		tm->tm_min, tm->tm_sec);

	return 0;
}

static int omap_rtc_scratch_read(struct udevice *dev, uint offset,
				 u8 *buffer, uint len)
{
	struct omap_rtc_priv *priv = dev_get_priv(dev);
	u32 *val = (u32 *)buffer;
	unsigned int reg;
	int i;

	if (len & 3)
		return -EFAULT;

	for (i = 0; i < len / 4; i++) {
		reg = OMAP_RTC_SCRATCH0_REG + offset + (i * 4);
		if (reg >= OMAP_RTC_KICK0_REG)
			return -EFAULT;

		val[i] = omap_rtc_readl(priv, reg);
	}

	return 0;
}

static int omap_rtc_scratch_write(struct udevice *dev, uint offset,
				  const u8 *buffer, uint len)
{
	struct omap_rtc_priv *priv = dev_get_priv(dev);
	u32 *val = (u32 *)buffer;
	unsigned int reg;
	int i;

	if (len & 3)
		return -EFAULT;

	omap_rtc_unlock(priv);
	for (i = 0; i < len / 4; i++) {
		reg = OMAP_RTC_SCRATCH0_REG + offset + (i * 4);
		if (reg >= OMAP_RTC_KICK0_REG)
			return -EFAULT;

		omap_rtc_writel(priv, reg, val[i]);
	}
	omap_rtc_lock(priv);

	return 0;
}

static int omap_rtc_remove(struct udevice *dev)
{
	struct omap_rtc_priv *priv = dev_get_priv(dev);
	u8 reg;

	if (priv->clk.dev)
		clk_disable(&priv->clk);

	omap_rtc_unlock(priv);

	/* leave rtc running, but disable irqs */
	omap_rtc_writeb(priv, OMAP_RTC_INTERRUPTS_REG, 0);

	if (priv->has_ext_clk) {
		reg = omap_rtc_readb(priv, OMAP_RTC_OSC_REG);
		reg &= ~OMAP_RTC_OSC_SEL_32KCLK_SRC;
		omap_rtc_writeb(priv, OMAP_RTC_OSC_REG, reg);
	}

	omap_rtc_lock(priv);
	return 0;
}

static int omap_rtc_probe(struct udevice *dev)
{
	struct omap_rtc_priv *priv = dev_get_priv(dev);
	struct rtc_time tm;
	u8 reg, mask, new_ctrl;

	priv->dev = dev;
	priv->type = (struct omap_rtc_device_type *)dev_get_driver_data(dev);
	priv->max_reg = OMAP_RTC_PMIC_REG;

	if (!clk_get_by_name(dev, "ext-clk", &priv->clk))
		priv->has_ext_clk = true;
	else
		clk_get_by_name(dev, "int-clk", &priv->clk);

	if (priv->clk.dev)
		clk_enable(&priv->clk);
	else
		dev_warn(dev, "missing clock\n");

	omap_rtc_unlock(priv);

	/*
	 * disable interrupts
	 *
	 * NOTE: ALARM2 is not cleared on AM3352 if rtc_write (writeb) is used
	 */
	omap_rtc_writel(priv, OMAP_RTC_INTERRUPTS_REG, 0);

	if (priv->type->has_32kclk_en) {
		reg = omap_rtc_readb(priv, OMAP_RTC_OSC_REG);
		omap_rtc_writeb(priv, OMAP_RTC_OSC_REG,
				reg | OMAP_RTC_OSC_32KCLK_EN);
	}

	/* clear old status */
	reg = omap_rtc_readb(priv, OMAP_RTC_STATUS_REG);

	mask = OMAP_RTC_STATUS_ALARM;

	if (priv->type->has_pmic_mode)
		mask |= OMAP_RTC_STATUS_ALARM2;

	if (priv->type->has_power_up_reset) {
		mask |= OMAP_RTC_STATUS_POWER_UP;
		if (reg & OMAP_RTC_STATUS_POWER_UP)
			dev_info(dev, "RTC power up reset detected\n");
	}

	if (reg & mask)
		omap_rtc_writeb(priv, OMAP_RTC_STATUS_REG, reg & mask);

	/* On boards with split power, RTC_ON_NOFF won't reset the RTC */
	reg = omap_rtc_readb(priv, OMAP_RTC_CTRL_REG);
	if (reg & OMAP_RTC_CTRL_STOP)
		dev_info(dev, "already running\n");

	/* force to 24 hour mode */
	new_ctrl = reg & (OMAP_RTC_CTRL_SPLIT | OMAP_RTC_CTRL_AUTO_COMP);
	new_ctrl |= OMAP_RTC_CTRL_STOP;

	/*
	 * BOARD-SPECIFIC CUSTOMIZATION CAN GO HERE:
	 *
	 *  - Device wake-up capability setting should come through chip
	 *    init logic. OMAP1 boards should initialize the "wakeup capable"
	 *    flag in the platform device if the board is wired right for
	 *    being woken up by RTC alarm. For OMAP-L138, this capability
	 *    is built into the SoC by the "Deep Sleep" capability.
	 *
	 *  - Boards wired so RTC_ON_nOFF is used as the reset signal,
	 *    rather than nPWRON_RESET, should forcibly enable split
	 *    power mode.  (Some chip errata report that RTC_CTRL_SPLIT
	 *    is write-only, and always reads as zero...)
	 */

	if (new_ctrl & OMAP_RTC_CTRL_SPLIT)
		dev_info(dev, "split power mode\n");

	if (reg != new_ctrl)
		omap_rtc_writeb(priv, OMAP_RTC_CTRL_REG, new_ctrl);

	/*
	 * If we have the external clock then switch to it so we can keep
	 * ticking across suspend.
	 */
	if (priv->has_ext_clk) {
		reg = omap_rtc_readb(priv, OMAP_RTC_OSC_REG);
		reg &= ~OMAP_RTC_OSC_OSC32K_GZ_DISABLE;
		reg |= OMAP_RTC_OSC_32KCLK_EN | OMAP_RTC_OSC_SEL_32KCLK_SRC;
		omap_rtc_writeb(priv, OMAP_RTC_OSC_REG, reg);
	}

	omap_rtc_lock(priv);

	if (omap_rtc_get(dev, &tm)) {
		dev_err(dev, "failed to get datetime\n");
	} else if (tm.tm_year == 2000 && tm.tm_mon == 1 && tm.tm_mday == 1 &&
		   tm.tm_wday == 0) {
		tm.tm_wday = 6;
		omap_rtc_set(dev, &tm);
	}

	return 0;
}

static int omap_rtc_of_to_plat(struct udevice *dev)
{
	struct omap_rtc_priv *priv = dev_get_priv(dev);

	priv->base = dev_read_addr(dev);
	if (priv->base == FDT_ADDR_T_NONE) {
		dev_err(dev, "invalid address\n");
		return -EINVAL;
	}

	dev_dbg(dev, "base=%pa\n", &priv->base);
	return 0;
}

static const struct rtc_ops omap_rtc_ops = {
	.get = omap_rtc_get,
	.set = omap_rtc_set,
	.reset = omap_rtc_reset,
	.read = omap_rtc_scratch_read,
	.write = omap_rtc_scratch_write,
};

static const struct omap_rtc_device_type omap_rtc_am3352_type = {
	.has_32kclk_en	= true,
	.has_irqwakeen	= true,
	.has_pmic_mode	= true,
};

static const struct omap_rtc_device_type omap_rtc_da830_type = {
	.has_32kclk_en	= false,
	.has_irqwakeen	= false,
	.has_pmic_mode	= false,
};

static const struct udevice_id omap_rtc_ids[] = {
	{.compatible = "ti,am3352-rtc", .data = (ulong)&omap_rtc_am3352_type},
	{.compatible = "ti,da830-rtc", .data = (ulong)&omap_rtc_da830_type }
};

U_BOOT_DRIVER(omap_rtc) = {
	.name = "omap_rtc",
	.id = UCLASS_RTC,
	.of_match = omap_rtc_ids,
	.ops = &omap_rtc_ops,
	.of_to_plat = omap_rtc_of_to_plat,
	.probe = omap_rtc_probe,
	.remove = omap_rtc_remove,
	.priv_auto = sizeof(struct omap_rtc_priv),
};
Commit	Line	Data
83d290c5	1	// SPDX-License-Identifier: GPL-2.0+
41d272d1 HS	2	/*
	3	* (C) Copyright 2011 DENX Software Engineering GmbH
	4	* Heiko Schocher <[email protected]>
9ec8b8b4	5	* Copyright (C) 2021 Dario Binacchi <[email protected]>
41d272d1 HS	6	*/
	7	#include <common.h>
	8	#include <command.h>
9ec8b8b4 DB	9	#include <dm.h>
9ec8b8b4 DB	10	#include <clk.h>
f7ae49fc	11	#include <log.h>
41d272d1 HS	12	#include <rtc.h>
41d272d1 HS	13	#include <asm/io.h>
9ec8b8b4	14	#include <dm/device_compat.h>
c05ed00a	15	#include <linux/delay.h>
41d272d1	16
9ec8b8b4 DB	17	/* RTC registers */
	18	#define OMAP_RTC_SECONDS_REG 0x00
	19	#define OMAP_RTC_MINUTES_REG 0x04
	20	#define OMAP_RTC_HOURS_REG 0x08
	21	#define OMAP_RTC_DAYS_REG 0x0C
	22	#define OMAP_RTC_MONTHS_REG 0x10
	23	#define OMAP_RTC_YEARS_REG 0x14
	24	#define OMAP_RTC_WEEKS_REG 0x18
6acee20e	25
9ec8b8b4 DB	26	#define OMAP_RTC_CTRL_REG 0x40
	27	#define OMAP_RTC_STATUS_REG 0x44
	28	#define OMAP_RTC_INTERRUPTS_REG 0x48
	29
	30	#define OMAP_RTC_OSC_REG 0x54
	31
	32	#define OMAP_RTC_SCRATCH0_REG 0x60
	33	#define OMAP_RTC_SCRATCH1_REG 0x64
	34	#define OMAP_RTC_SCRATCH2_REG 0x68
	35
	36	#define OMAP_RTC_KICK0_REG 0x6c
	37	#define OMAP_RTC_KICK1_REG 0x70
	38
	39	#define OMAP_RTC_PMIC_REG 0x98
	40
	41	/* OMAP_RTC_CTRL_REG bit fields: */
	42	#define OMAP_RTC_CTRL_SPLIT BIT(7)
	43	#define OMAP_RTC_CTRL_DISABLE BIT(6)
	44	#define OMAP_RTC_CTRL_SET_32_COUNTER BIT(5)
	45	#define OMAP_RTC_CTRL_TEST BIT(4)
	46	#define OMAP_RTC_CTRL_MODE_12_24 BIT(3)
	47	#define OMAP_RTC_CTRL_AUTO_COMP BIT(2)
	48	#define OMAP_RTC_CTRL_ROUND_30S BIT(1)
	49	#define OMAP_RTC_CTRL_STOP BIT(0)
	50
	51	/* OMAP_RTC_STATUS_REG bit fields */
	52	#define OMAP_RTC_STATUS_POWER_UP BIT(7)
	53	#define OMAP_RTC_STATUS_ALARM2 BIT(7)
	54	#define OMAP_RTC_STATUS_ALARM BIT(6)
	55	#define OMAP_RTC_STATUS_1D_EVENT BIT(5)
	56	#define OMAP_RTC_STATUS_1H_EVENT BIT(4)
	57	#define OMAP_RTC_STATUS_1M_EVENT BIT(3)
	58	#define OMAP_RTC_STATUS_1S_EVENT BIT(2)
	59	#define OMAP_RTC_STATUS_RUN BIT(1)
	60	#define OMAP_RTC_STATUS_BUSY BIT(0)
	61
	62	/* OMAP_RTC_OSC_REG bit fields */
	63	#define OMAP_RTC_OSC_32KCLK_EN BIT(6)
	64	#define OMAP_RTC_OSC_SEL_32KCLK_SRC BIT(3)
	65	#define OMAP_RTC_OSC_OSC32K_GZ_DISABLE BIT(4)
	66
	67	/* OMAP_RTC_KICKER values */
	68	#define OMAP_RTC_KICK0_VALUE 0x83e70b13
	69	#define OMAP_RTC_KICK1_VALUE 0x95a4f1e0
	70
	71	struct omap_rtc_device_type {
	72	bool has_32kclk_en;
	73	bool has_irqwakeen;
	74	bool has_pmic_mode;
	75	bool has_power_up_reset;
	76	};
	77
	78	struct omap_rtc_priv {
	79	fdt_addr_t base;
	80	u8 max_reg;
	81	struct udevice *dev;
	82	struct clk clk;
	83	bool has_ext_clk;
	84	const struct omap_rtc_device_type *type;
	85	};
	86
	87	static inline u8 omap_rtc_readb(struct omap_rtc_priv *priv, unsigned int reg)
	88	{
	89	return readb(priv->base + reg);
90	}
91
92	static inline u32 omap_rtc_readl(struct omap_rtc_priv *priv, unsigned int reg)
93	{
94	return readl(priv->base + reg);
95	}
96
97	static inline void omap_rtc_writeb(struct omap_rtc_priv *priv, unsigned int reg,
98	u8 val)
99	{
100	writeb(val, priv->base + reg);
101	}
102
103	static inline void omap_rtc_writel(struct omap_rtc_priv *priv, unsigned int reg,
104	u32 val)
105	{
106	writel(val, priv->base + reg);
107	}
108
109	static inline void omap_rtc_unlock(struct omap_rtc_priv *priv)
c7c7c8db	110	{
9ec8b8b4 DB	111	omap_rtc_writel(priv, OMAP_RTC_KICK0_REG, OMAP_RTC_KICK0_VALUE);
9ec8b8b4 DB	112	omap_rtc_writel(priv, OMAP_RTC_KICK1_REG, OMAP_RTC_KICK1_VALUE);
c7c7c8db DB	113	}
c7c7c8db DB	114
9ec8b8b4	115	static inline void omap_rtc_lock(struct omap_rtc_priv *priv)
c7c7c8db	116	{
9ec8b8b4 DB	117	omap_rtc_writel(priv, OMAP_RTC_KICK0_REG, 0);
9ec8b8b4 DB	118	omap_rtc_writel(priv, OMAP_RTC_KICK1_REG, 0);
c7c7c8db DB	119	}
c7c7c8db DB	120
9ec8b8b4	121	static int omap_rtc_wait_not_busy(struct omap_rtc_priv *priv)
41d272d1	122	{
79250ef3 DB	123	int count;
79250ef3 DB	124	u8 status;
41d272d1	125
9ec8b8b4 DB	126	status = omap_rtc_readb(priv, OMAP_RTC_STATUS_REG);
9ec8b8b4 DB	127	if ((status & OMAP_RTC_STATUS_RUN) != OMAP_RTC_STATUS_RUN) {
41d272d1 HS	128	printf("RTC doesn't run\n");
	129	return -1;
	130	}
79250ef3 DB	131
	132	/* BUSY may stay active for 1/32768 second (~30 usec) */
	133	for (count = 0; count < 50; count++) {
9ec8b8b4	134	if (!(status & OMAP_RTC_STATUS_BUSY))
79250ef3 DB	135	break;
	136
	137	udelay(1);
9ec8b8b4	138	status = omap_rtc_readb(priv, OMAP_RTC_STATUS_REG);
79250ef3 DB	139	}
	140
	141	/* now we have ~15 usec to read/write various registers */
	142	return 0;
	143	}
	144
9ec8b8b4 DB	145	static int omap_rtc_reset(struct udevice *dev)
	146	{
	147	struct omap_rtc_priv *priv = dev_get_priv(dev);
	148
	149	/* run RTC counter */
	150	omap_rtc_writeb(priv, OMAP_RTC_CTRL_REG, 0x01);
	151	return 0;
	152	}
	153
	154	static int omap_rtc_set(struct udevice dev, const struct rtc_time tm)
	155	{
	156	struct omap_rtc_priv *priv = dev_get_priv(dev);
	157	int ret;
	158
	159	ret = omap_rtc_wait_not_busy(priv);
	160	if (ret)
	161	return ret;
	162
	163	omap_rtc_unlock(priv);
	164	omap_rtc_writeb(priv, OMAP_RTC_YEARS_REG, bin2bcd(tm->tm_year % 100));
	165	omap_rtc_writeb(priv, OMAP_RTC_MONTHS_REG, bin2bcd(tm->tm_mon));
	166	omap_rtc_writeb(priv, OMAP_RTC_WEEKS_REG, bin2bcd(tm->tm_wday));
	167	omap_rtc_writeb(priv, OMAP_RTC_DAYS_REG, bin2bcd(tm->tm_mday));
	168	omap_rtc_writeb(priv, OMAP_RTC_HOURS_REG, bin2bcd(tm->tm_hour));
	169	omap_rtc_writeb(priv, OMAP_RTC_MINUTES_REG, bin2bcd(tm->tm_min));
	170	omap_rtc_writeb(priv, OMAP_RTC_SECONDS_REG, bin2bcd(tm->tm_sec));
	171	omap_rtc_lock(priv);
	172
	173	dev_dbg(dev, "Set DATE: %4d-%02d-%02d (wday=%d) TIME: %2d:%02d:%02d\n",
	174	tm->tm_year, tm->tm_mon, tm->tm_mday, tm->tm_wday, tm->tm_hour,
	175	tm->tm_min, tm->tm_sec);
	176
	177	return 0;
	178	}
	179
	180	static int omap_rtc_get(struct udevice dev, struct rtc_time tm)
79250ef3	181	{
9ec8b8b4	182	struct omap_rtc_priv *priv = dev_get_priv(dev);
79250ef3 DB	183	unsigned long sec, min, hour, mday, wday, mon_cent, year;
	184	int ret;
	185
9ec8b8b4	186	ret = omap_rtc_wait_not_busy(priv);
79250ef3 DB	187	if (ret)
79250ef3 DB	188	return ret;
41d272d1	189
9ec8b8b4 DB	190	sec = omap_rtc_readb(priv, OMAP_RTC_SECONDS_REG);
	191	min = omap_rtc_readb(priv, OMAP_RTC_MINUTES_REG);
	192	hour = omap_rtc_readb(priv, OMAP_RTC_HOURS_REG);
	193	mday = omap_rtc_readb(priv, OMAP_RTC_DAYS_REG);
	194	wday = omap_rtc_readb(priv, OMAP_RTC_WEEKS_REG);
	195	mon_cent = omap_rtc_readb(priv, OMAP_RTC_MONTHS_REG);
	196	year = omap_rtc_readb(priv, OMAP_RTC_YEARS_REG);
41d272d1	197
9ec8b8b4 DB	198	dev_dbg(dev,
9ec8b8b4 DB	199	"Get RTC year: %02lx mon/cent: %02lx mday: %02lx wday: %02lx "
41d272d1 HS	200	"hr: %02lx min: %02lx sec: %02lx\n",
	201	year, mon_cent, mday, wday,
	202	hour, min, sec);
	203
9ec8b8b4 DB	204	tm->tm_sec = bcd2bin(sec & 0x7F);
	205	tm->tm_min = bcd2bin(min & 0x7F);
	206	tm->tm_hour = bcd2bin(hour & 0x3F);
	207	tm->tm_mday = bcd2bin(mday & 0x3F);
	208	tm->tm_mon = bcd2bin(mon_cent & 0x1F);
	209	tm->tm_year = bcd2bin(year) + 2000;
	210	tm->tm_wday = bcd2bin(wday & 0x07);
	211	tm->tm_yday = 0;
	212	tm->tm_isdst = 0;
41d272d1	213
9ec8b8b4 DB	214	dev_dbg(dev, "Get DATE: %4d-%02d-%02d (wday=%d) TIME: %2d:%02d:%02d\n",
	215	tm->tm_year, tm->tm_mon, tm->tm_mday, tm->tm_wday, tm->tm_hour,
	216	tm->tm_min, tm->tm_sec);
41d272d1 HS	217
	218	return 0;
	219	}
	220
9ec8b8b4 DB	221	static int omap_rtc_scratch_read(struct udevice *dev, uint offset,
9ec8b8b4 DB	222	u8 *buffer, uint len)
41d272d1	223	{
9ec8b8b4 DB	224	struct omap_rtc_priv *priv = dev_get_priv(dev);
	225	u32 val = (u32 )buffer;
	226	unsigned int reg;
	227	int i;
79250ef3	228
9ec8b8b4 DB	229	if (len & 3)
	230	return -EFAULT;
	231
	232	for (i = 0; i < len / 4; i++) {
	233	reg = OMAP_RTC_SCRATCH0_REG + offset + (i * 4);
	234	if (reg >= OMAP_RTC_KICK0_REG)
	235	return -EFAULT;
	236
	237	val[i] = omap_rtc_readl(priv, reg);
	238	}
	239
	240	return 0;
	241	}
	242
	243	static int omap_rtc_scratch_write(struct udevice *dev, uint offset,
	244	const u8 *buffer, uint len)
	245	{
	246	struct omap_rtc_priv *priv = dev_get_priv(dev);
	247	u32 val = (u32 )buffer;
	248	unsigned int reg;
	249	int i;
41d272d1	250
9ec8b8b4 DB	251	if (len & 3)
9ec8b8b4 DB	252	return -EFAULT;
41d272d1	253
9ec8b8b4 DB	254	omap_rtc_unlock(priv);
	255	for (i = 0; i < len / 4; i++) {
	256	reg = OMAP_RTC_SCRATCH0_REG + offset + (i * 4);
	257	if (reg >= OMAP_RTC_KICK0_REG)
	258	return -EFAULT;
79250ef3	259
9ec8b8b4 DB	260	omap_rtc_writel(priv, reg, val[i]);
	261	}
	262	omap_rtc_lock(priv);
79250ef3	263
41d272d1 HS	264	return 0;
	265	}
	266
9ec8b8b4	267	static int omap_rtc_remove(struct udevice *dev)
41d272d1	268	{
9ec8b8b4 DB	269	struct omap_rtc_priv *priv = dev_get_priv(dev);
9ec8b8b4 DB	270	u8 reg;
41d272d1	271
9ec8b8b4 DB	272	if (priv->clk.dev)
	273	clk_disable(&priv->clk);
	274
	275	omap_rtc_unlock(priv);
	276
	277	/* leave rtc running, but disable irqs */
	278	omap_rtc_writeb(priv, OMAP_RTC_INTERRUPTS_REG, 0);
	279
	280	if (priv->has_ext_clk) {
	281	reg = omap_rtc_readb(priv, OMAP_RTC_OSC_REG);
	282	reg &= ~OMAP_RTC_OSC_SEL_32KCLK_SRC;
	283	omap_rtc_writeb(priv, OMAP_RTC_OSC_REG, reg);
	284	}
	285
	286	omap_rtc_lock(priv);
	287	return 0;
	288	}
	289
	290	static int omap_rtc_probe(struct udevice *dev)
	291	{
	292	struct omap_rtc_priv *priv = dev_get_priv(dev);
08ea87a6	293	struct rtc_time tm;
9ec8b8b4 DB	294	u8 reg, mask, new_ctrl;
	295
	296	priv->dev = dev;
	297	priv->type = (struct omap_rtc_device_type *)dev_get_driver_data(dev);
	298	priv->max_reg = OMAP_RTC_PMIC_REG;
	299
	300	if (!clk_get_by_name(dev, "ext-clk", &priv->clk))
	301	priv->has_ext_clk = true;
	302	else
	303	clk_get_by_name(dev, "int-clk", &priv->clk);
	304
	305	if (priv->clk.dev)
	306	clk_enable(&priv->clk);
	307	else
	308	dev_warn(dev, "missing clock\n");
	309
	310	omap_rtc_unlock(priv);
	311
	312	/*
	313	* disable interrupts
	314	*
	315	* NOTE: ALARM2 is not cleared on AM3352 if rtc_write (writeb) is used
	316	*/
	317	omap_rtc_writel(priv, OMAP_RTC_INTERRUPTS_REG, 0);
	318
	319	if (priv->type->has_32kclk_en) {
	320	reg = omap_rtc_readb(priv, OMAP_RTC_OSC_REG);
	321	omap_rtc_writeb(priv, OMAP_RTC_OSC_REG,
	322	reg \| OMAP_RTC_OSC_32KCLK_EN);
	323	}
	324
	325	/* clear old status */
	326	reg = omap_rtc_readb(priv, OMAP_RTC_STATUS_REG);
	327
	328	mask = OMAP_RTC_STATUS_ALARM;
	329
	330	if (priv->type->has_pmic_mode)
	331	mask \|= OMAP_RTC_STATUS_ALARM2;
	332
	333	if (priv->type->has_power_up_reset) {
	334	mask \|= OMAP_RTC_STATUS_POWER_UP;
	335	if (reg & OMAP_RTC_STATUS_POWER_UP)
	336	dev_info(dev, "RTC power up reset detected\n");
	337	}
	338
	339	if (reg & mask)
	340	omap_rtc_writeb(priv, OMAP_RTC_STATUS_REG, reg & mask);
	341
	342	/* On boards with split power, RTC_ON_NOFF won't reset the RTC */
	343	reg = omap_rtc_readb(priv, OMAP_RTC_CTRL_REG);
	344	if (reg & OMAP_RTC_CTRL_STOP)
	345	dev_info(dev, "already running\n");
	346
	347	/* force to 24 hour mode */
	348	new_ctrl = reg & (OMAP_RTC_CTRL_SPLIT \| OMAP_RTC_CTRL_AUTO_COMP);
	349	new_ctrl \|= OMAP_RTC_CTRL_STOP;
	350
	351	/*
	352	* BOARD-SPECIFIC CUSTOMIZATION CAN GO HERE:
	353	*
	354	* - Device wake-up capability setting should come through chip
	355	* init logic. OMAP1 boards should initialize the "wakeup capable"
	356	* flag in the platform device if the board is wired right for
	357	* being woken up by RTC alarm. For OMAP-L138, this capability
358	* is built into the SoC by the "Deep Sleep" capability.
359	*
360	* - Boards wired so RTC_ON_nOFF is used as the reset signal,
361	* rather than nPWRON_RESET, should forcibly enable split
362	* power mode. (Some chip errata report that RTC_CTRL_SPLIT
363	* is write-only, and always reads as zero...)
364	*/
365
366	if (new_ctrl & OMAP_RTC_CTRL_SPLIT)
367	dev_info(dev, "split power mode\n");
368
369	if (reg != new_ctrl)
370	omap_rtc_writeb(priv, OMAP_RTC_CTRL_REG, new_ctrl);
371
372	/*
373	* If we have the external clock then switch to it so we can keep
374	* ticking across suspend.
375	*/
376	if (priv->has_ext_clk) {
377	reg = omap_rtc_readb(priv, OMAP_RTC_OSC_REG);
378	reg &= ~OMAP_RTC_OSC_OSC32K_GZ_DISABLE;
379	reg \|= OMAP_RTC_OSC_32KCLK_EN \| OMAP_RTC_OSC_SEL_32KCLK_SRC;
380	omap_rtc_writeb(priv, OMAP_RTC_OSC_REG, reg);
381	}
382
383	omap_rtc_lock(priv);
08ea87a6 DB	384
	385	if (omap_rtc_get(dev, &tm)) {
	386	dev_err(dev, "failed to get datetime\n");
	387	} else if (tm.tm_year == 2000 && tm.tm_mon == 1 && tm.tm_mday == 1 &&
	388	tm.tm_wday == 0) {
	389	tm.tm_wday = 6;
	390	omap_rtc_set(dev, &tm);
	391	}
	392
9ec8b8b4	393	return 0;
41d272d1	394	}
9ec8b8b4 DB	395
	396	static int omap_rtc_of_to_plat(struct udevice *dev)
	397	{
	398	struct omap_rtc_priv *priv = dev_get_priv(dev);
	399
	400	priv->base = dev_read_addr(dev);
	401	if (priv->base == FDT_ADDR_T_NONE) {
	402	dev_err(dev, "invalid address\n");
	403	return -EINVAL;
	404	}
	405
	406	dev_dbg(dev, "base=%pa\n", &priv->base);
	407	return 0;
	408	}
	409
	410	static const struct rtc_ops omap_rtc_ops = {
	411	.get = omap_rtc_get,
	412	.set = omap_rtc_set,
	413	.reset = omap_rtc_reset,
	414	.read = omap_rtc_scratch_read,
	415	.write = omap_rtc_scratch_write,
	416	};
	417
	418	static const struct omap_rtc_device_type omap_rtc_am3352_type = {
	419	.has_32kclk_en = true,
	420	.has_irqwakeen = true,
	421	.has_pmic_mode = true,
	422	};
	423
	424	static const struct omap_rtc_device_type omap_rtc_da830_type = {
	425	.has_32kclk_en = false,
	426	.has_irqwakeen = false,
	427	.has_pmic_mode = false,
	428	};
	429
	430	static const struct udevice_id omap_rtc_ids[] = {
	431	{.compatible = "ti,am3352-rtc", .data = (ulong)&omap_rtc_am3352_type},
	432	{.compatible = "ti,da830-rtc", .data = (ulong)&omap_rtc_da830_type }
	433	};
	434
	435	U_BOOT_DRIVER(omap_rtc) = {
	436	.name = "omap_rtc",
	437	.id = UCLASS_RTC,
	438	.of_match = omap_rtc_ids,
	439	.ops = &omap_rtc_ops,
	440	.of_to_plat = omap_rtc_of_to_plat,
	441	.probe = omap_rtc_probe,
	442	.remove = omap_rtc_remove,
	443	.priv_auto = sizeof(struct omap_rtc_priv),
	444	};