Add the rt linux 4.1.3-rt3 as base

Import the rt linux 4.1.3-rt3 as OPNFV kvm base.

It's from git://git.kernel.org/pub/scm/linux/kernel/git/rt/linux-rt-devel.git linux-4.1.y-rt and
the base is:

commit 0917f823c59692d751951bf5ea699a2d1e2f26a2
Author: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Date:   Sat Jul 25 12:13:34 2015 +0200

    Prepare v4.1.3-rt3

    Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>

We lose all the git history this way and it's not good. We
should apply another opnfv project repo in future.

Change-Id: I87543d81c9df70d99c5001fbdf646b202c19f423
Signed-off-by: Yunhong Jiang <yunhong.jiang@intel.com>

1 files changed, 774 insertions, 0 deletions

diff --git a/kernel/drivers/rtc/rtc-omap.c b/kernel/drivers/rtc/rtc-omap.c
new file mode 100644
index 000000000..8b6355ffa
--- /dev/null
+++ b/kernel/drivers/rtc/rtc-omap.c
@@ -0,0 +1,774 @@
+/*
+ * TI OMAP Real Time Clock interface for Linux
+ *
+ * Copyright (C) 2003 MontaVista Software, Inc.
+ * Author: George G. Davis <gdavis@mvista.com> or <source@mvista.com>
+ *
+ * Copyright (C) 2006 David Brownell (new RTC framework)
+ * Copyright (C) 2014 Johan Hovold <johan@kernel.org>
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version
+ * 2 of the License, or (at your option) any later version.
+ */
+
+#include <linux/kernel.h>
+#include <linux/init.h>
+#include <linux/module.h>
+#include <linux/ioport.h>
+#include <linux/delay.h>
+#include <linux/rtc.h>
+#include <linux/bcd.h>
+#include <linux/platform_device.h>
+#include <linux/of.h>
+#include <linux/of_device.h>
+#include <linux/pm_runtime.h>
+#include <linux/io.h>
+
+/*
+ * The OMAP RTC is a year/month/day/hours/minutes/seconds BCD clock
+ * with century-range alarm matching, driven by the 32kHz clock.
+ *
+ * The main user-visible ways it differs from PC RTCs are by omitting
+ * "don't care" alarm fields and sub-second periodic IRQs, and having
+ * an autoadjust mechanism to calibrate to the true oscillator rate.
+ *
+ * Board-specific wiring options include using split power mode with
+ * RTC_OFF_NOFF used as the reset signal (so the RTC won't be reset),
+ * and wiring RTC_WAKE_INT (so the RTC alarm can wake the system from
+ * low power modes) for OMAP1 boards (OMAP-L138 has this built into
+ * the SoC). See the BOARD-SPECIFIC CUSTOMIZATION comment.
+ */
+
+/* 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_ALARM_SECONDS_REG	0x20
+#define OMAP_RTC_ALARM_MINUTES_REG	0x24
+#define OMAP_RTC_ALARM_HOURS_REG	0x28
+#define OMAP_RTC_ALARM_DAYS_REG		0x2c
+#define OMAP_RTC_ALARM_MONTHS_REG	0x30
+#define OMAP_RTC_ALARM_YEARS_REG	0x34
+
+#define OMAP_RTC_CTRL_REG		0x40
+#define OMAP_RTC_STATUS_REG		0x44
+#define OMAP_RTC_INTERRUPTS_REG		0x48
+
+#define OMAP_RTC_COMP_LSB_REG		0x4c
+#define OMAP_RTC_COMP_MSB_REG		0x50
+#define OMAP_RTC_OSC_REG		0x54
+
+#define OMAP_RTC_KICK0_REG		0x6c
+#define OMAP_RTC_KICK1_REG		0x70
+
+#define OMAP_RTC_IRQWAKEEN		0x7c
+
+#define OMAP_RTC_ALARM2_SECONDS_REG	0x80
+#define OMAP_RTC_ALARM2_MINUTES_REG	0x84
+#define OMAP_RTC_ALARM2_HOURS_REG	0x88
+#define OMAP_RTC_ALARM2_DAYS_REG	0x8c
+#define OMAP_RTC_ALARM2_MONTHS_REG	0x90
+#define OMAP_RTC_ALARM2_YEARS_REG	0x94
+
+#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_INTERRUPTS_REG bit fields: */
+#define OMAP_RTC_INTERRUPTS_IT_ALARM2	BIT(4)
+#define OMAP_RTC_INTERRUPTS_IT_ALARM	BIT(3)
+#define OMAP_RTC_INTERRUPTS_IT_TIMER	BIT(2)
+
+/* OMAP_RTC_OSC_REG bit fields: */
+#define OMAP_RTC_OSC_32KCLK_EN		BIT(6)
+
+/* OMAP_RTC_IRQWAKEEN bit fields: */
+#define OMAP_RTC_IRQWAKEEN_ALARM_WAKEEN	BIT(1)
+
+/* OMAP_RTC_PMIC bit fields: */
+#define OMAP_RTC_PMIC_POWER_EN_EN	BIT(16)
+
+/* OMAP_RTC_KICKER values */
+#define	KICK0_VALUE			0x83e70b13
+#define	KICK1_VALUE			0x95a4f1e0
+
+struct omap_rtc;
+
+struct omap_rtc_device_type {
+	bool has_32kclk_en;
+	bool has_irqwakeen;
+	bool has_pmic_mode;
+	bool has_power_up_reset;
+	void (*lock)(struct omap_rtc *rtc);
+	void (*unlock)(struct omap_rtc *rtc);
+};
+
+struct omap_rtc {
+	struct rtc_device *rtc;
+	void __iomem *base;
+	int irq_alarm;
+	int irq_timer;
+	u8 interrupts_reg;
+	bool is_pmic_controller;
+	const struct omap_rtc_device_type *type;
+};
+
+static inline u8 rtc_read(struct omap_rtc *rtc, unsigned int reg)
+{
+	return readb(rtc->base + reg);
+}
+
+static inline u32 rtc_readl(struct omap_rtc *rtc, unsigned int reg)
+{
+	return readl(rtc->base + reg);
+}
+
+static inline void rtc_write(struct omap_rtc *rtc, unsigned int reg, u8 val)
+{
+	writeb(val, rtc->base + reg);
+}
+
+static inline void rtc_writel(struct omap_rtc *rtc, unsigned int reg, u32 val)
+{
+	writel(val, rtc->base + reg);
+}
+
+static void am3352_rtc_unlock(struct omap_rtc *rtc)
+{
+	rtc_writel(rtc, OMAP_RTC_KICK0_REG, KICK0_VALUE);
+	rtc_writel(rtc, OMAP_RTC_KICK1_REG, KICK1_VALUE);
+}
+
+static void am3352_rtc_lock(struct omap_rtc *rtc)
+{
+	rtc_writel(rtc, OMAP_RTC_KICK0_REG, 0);
+	rtc_writel(rtc, OMAP_RTC_KICK1_REG, 0);
+}
+
+static void default_rtc_unlock(struct omap_rtc *rtc)
+{
+}
+
+static void default_rtc_lock(struct omap_rtc *rtc)
+{
+}
+
+/*
+ * We rely on the rtc framework to handle locking (rtc->ops_lock),
+ * so the only other requirement is that register accesses which
+ * require BUSY to be clear are made with IRQs locally disabled
+ */
+static void rtc_wait_not_busy(struct omap_rtc *rtc)
+{
+	int count;
+	u8 status;
+
+	/* BUSY may stay active for 1/32768 second (~30 usec) */
+	for (count = 0; count < 50; count++) {
+		status = rtc_read(rtc, OMAP_RTC_STATUS_REG);
+		if (!(status & OMAP_RTC_STATUS_BUSY))
+			break;
+		udelay(1);
+	}
+	/* now we have ~15 usec to read/write various registers */
+}
+
+static irqreturn_t rtc_irq(int irq, void *dev_id)
+{
+	struct omap_rtc	*rtc = dev_id;
+	unsigned long events = 0;
+	u8 irq_data;
+
+	irq_data = rtc_read(rtc, OMAP_RTC_STATUS_REG);
+
+	/* alarm irq? */
+	if (irq_data & OMAP_RTC_STATUS_ALARM) {
+		rtc->type->unlock(rtc);
+		rtc_write(rtc, OMAP_RTC_STATUS_REG, OMAP_RTC_STATUS_ALARM);
+		rtc->type->lock(rtc);
+		events |= RTC_IRQF | RTC_AF;
+	}
+
+	/* 1/sec periodic/update irq? */
+	if (irq_data & OMAP_RTC_STATUS_1S_EVENT)
+		events |= RTC_IRQF | RTC_UF;
+
+	rtc_update_irq(rtc->rtc, 1, events);
+
+	return IRQ_HANDLED;
+}
+
+static int omap_rtc_alarm_irq_enable(struct device *dev, unsigned int enabled)
+{
+	struct omap_rtc *rtc = dev_get_drvdata(dev);
+	u8 reg, irqwake_reg = 0;
+
+	local_irq_disable();
+	rtc_wait_not_busy(rtc);
+	reg = rtc_read(rtc, OMAP_RTC_INTERRUPTS_REG);
+	if (rtc->type->has_irqwakeen)
+		irqwake_reg = rtc_read(rtc, OMAP_RTC_IRQWAKEEN);
+
+	if (enabled) {
+		reg |= OMAP_RTC_INTERRUPTS_IT_ALARM;
+		irqwake_reg |= OMAP_RTC_IRQWAKEEN_ALARM_WAKEEN;
+	} else {
+		reg &= ~OMAP_RTC_INTERRUPTS_IT_ALARM;
+		irqwake_reg &= ~OMAP_RTC_IRQWAKEEN_ALARM_WAKEEN;
+	}
+	rtc_wait_not_busy(rtc);
+	rtc->type->unlock(rtc);
+	rtc_write(rtc, OMAP_RTC_INTERRUPTS_REG, reg);
+	if (rtc->type->has_irqwakeen)
+		rtc_write(rtc, OMAP_RTC_IRQWAKEEN, irqwake_reg);
+	rtc->type->lock(rtc);
+	local_irq_enable();
+
+	return 0;
+}
+
+/* this hardware doesn't support "don't care" alarm fields */
+static int tm2bcd(struct rtc_time *tm)
+{
+	if (rtc_valid_tm(tm) != 0)
+		return -EINVAL;
+
+	tm->tm_sec = bin2bcd(tm->tm_sec);
+	tm->tm_min = bin2bcd(tm->tm_min);
+	tm->tm_hour = bin2bcd(tm->tm_hour);
+	tm->tm_mday = bin2bcd(tm->tm_mday);
+
+	tm->tm_mon = bin2bcd(tm->tm_mon + 1);
+
+	/* epoch == 1900 */
+	if (tm->tm_year < 100 || tm->tm_year > 199)
+		return -EINVAL;
+	tm->tm_year = bin2bcd(tm->tm_year - 100);
+
+	return 0;
+}
+
+static void bcd2tm(struct rtc_time *tm)
+{
+	tm->tm_sec = bcd2bin(tm->tm_sec);
+	tm->tm_min = bcd2bin(tm->tm_min);
+	tm->tm_hour = bcd2bin(tm->tm_hour);
+	tm->tm_mday = bcd2bin(tm->tm_mday);
+	tm->tm_mon = bcd2bin(tm->tm_mon) - 1;
+	/* epoch == 1900 */
+	tm->tm_year = bcd2bin(tm->tm_year) + 100;
+}
+
+static void omap_rtc_read_time_raw(struct omap_rtc *rtc, struct rtc_time *tm)
+{
+	tm->tm_sec = rtc_read(rtc, OMAP_RTC_SECONDS_REG);
+	tm->tm_min = rtc_read(rtc, OMAP_RTC_MINUTES_REG);
+	tm->tm_hour = rtc_read(rtc, OMAP_RTC_HOURS_REG);
+	tm->tm_mday = rtc_read(rtc, OMAP_RTC_DAYS_REG);
+	tm->tm_mon = rtc_read(rtc, OMAP_RTC_MONTHS_REG);
+	tm->tm_year = rtc_read(rtc, OMAP_RTC_YEARS_REG);
+}
+
+static int omap_rtc_read_time(struct device *dev, struct rtc_time *tm)
+{
+	struct omap_rtc *rtc = dev_get_drvdata(dev);
+
+	/* we don't report wday/yday/isdst ... */
+	local_irq_disable();
+	rtc_wait_not_busy(rtc);
+	omap_rtc_read_time_raw(rtc, tm);
+	local_irq_enable();
+
+	bcd2tm(tm);
+
+	return 0;
+}
+
+static int omap_rtc_set_time(struct device *dev, struct rtc_time *tm)
+{
+	struct omap_rtc *rtc = dev_get_drvdata(dev);
+
+	if (tm2bcd(tm) < 0)
+		return -EINVAL;
+
+	local_irq_disable();
+	rtc_wait_not_busy(rtc);
+
+	rtc->type->unlock(rtc);
+	rtc_write(rtc, OMAP_RTC_YEARS_REG, tm->tm_year);
+	rtc_write(rtc, OMAP_RTC_MONTHS_REG, tm->tm_mon);
+	rtc_write(rtc, OMAP_RTC_DAYS_REG, tm->tm_mday);
+	rtc_write(rtc, OMAP_RTC_HOURS_REG, tm->tm_hour);
+	rtc_write(rtc, OMAP_RTC_MINUTES_REG, tm->tm_min);
+	rtc_write(rtc, OMAP_RTC_SECONDS_REG, tm->tm_sec);
+	rtc->type->lock(rtc);
+
+	local_irq_enable();
+
+	return 0;
+}
+
+static int omap_rtc_read_alarm(struct device *dev, struct rtc_wkalrm *alm)
+{
+	struct omap_rtc *rtc = dev_get_drvdata(dev);
+	u8 interrupts;
+
+	local_irq_disable();
+	rtc_wait_not_busy(rtc);
+
+	alm->time.tm_sec = rtc_read(rtc, OMAP_RTC_ALARM_SECONDS_REG);
+	alm->time.tm_min = rtc_read(rtc, OMAP_RTC_ALARM_MINUTES_REG);
+	alm->time.tm_hour = rtc_read(rtc, OMAP_RTC_ALARM_HOURS_REG);
+	alm->time.tm_mday = rtc_read(rtc, OMAP_RTC_ALARM_DAYS_REG);
+	alm->time.tm_mon = rtc_read(rtc, OMAP_RTC_ALARM_MONTHS_REG);
+	alm->time.tm_year = rtc_read(rtc, OMAP_RTC_ALARM_YEARS_REG);
+
+	local_irq_enable();
+
+	bcd2tm(&alm->time);
+
+	interrupts = rtc_read(rtc, OMAP_RTC_INTERRUPTS_REG);
+	alm->enabled = !!(interrupts & OMAP_RTC_INTERRUPTS_IT_ALARM);
+
+	return 0;
+}
+
+static int omap_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *alm)
+{
+	struct omap_rtc *rtc = dev_get_drvdata(dev);
+	u8 reg, irqwake_reg = 0;
+
+	if (tm2bcd(&alm->time) < 0)
+		return -EINVAL;
+
+	local_irq_disable();
+	rtc_wait_not_busy(rtc);
+
+	rtc->type->unlock(rtc);
+	rtc_write(rtc, OMAP_RTC_ALARM_YEARS_REG, alm->time.tm_year);
+	rtc_write(rtc, OMAP_RTC_ALARM_MONTHS_REG, alm->time.tm_mon);
+	rtc_write(rtc, OMAP_RTC_ALARM_DAYS_REG, alm->time.tm_mday);
+	rtc_write(rtc, OMAP_RTC_ALARM_HOURS_REG, alm->time.tm_hour);
+	rtc_write(rtc, OMAP_RTC_ALARM_MINUTES_REG, alm->time.tm_min);
+	rtc_write(rtc, OMAP_RTC_ALARM_SECONDS_REG, alm->time.tm_sec);
+
+	reg = rtc_read(rtc, OMAP_RTC_INTERRUPTS_REG);
+	if (rtc->type->has_irqwakeen)
+		irqwake_reg = rtc_read(rtc, OMAP_RTC_IRQWAKEEN);
+
+	if (alm->enabled) {
+		reg |= OMAP_RTC_INTERRUPTS_IT_ALARM;
+		irqwake_reg |= OMAP_RTC_IRQWAKEEN_ALARM_WAKEEN;
+	} else {
+		reg &= ~OMAP_RTC_INTERRUPTS_IT_ALARM;
+		irqwake_reg &= ~OMAP_RTC_IRQWAKEEN_ALARM_WAKEEN;
+	}
+	rtc_write(rtc, OMAP_RTC_INTERRUPTS_REG, reg);
+	if (rtc->type->has_irqwakeen)
+		rtc_write(rtc, OMAP_RTC_IRQWAKEEN, irqwake_reg);
+	rtc->type->lock(rtc);
+
+	local_irq_enable();
+
+	return 0;
+}
+
+static struct omap_rtc *omap_rtc_power_off_rtc;
+
+/*
+ * omap_rtc_poweroff: RTC-controlled power off
+ *
+ * The RTC can be used to control an external PMIC via the pmic_power_en pin,
+ * which can be configured to transition to OFF on ALARM2 events.
+ *
+ * Notes:
+ * The two-second alarm offset is the shortest offset possible as the alarm
+ * registers must be set before the next timer update and the offset
+ * calculation is too heavy for everything to be done within a single access
+ * period (~15 us).
+ *
+ * Called with local interrupts disabled.
+ */
+static void omap_rtc_power_off(void)
+{
+	struct omap_rtc *rtc = omap_rtc_power_off_rtc;
+	struct rtc_time tm;
+	unsigned long now;
+	u32 val;
+
+	rtc->type->unlock(rtc);
+	/* enable pmic_power_en control */
+	val = rtc_readl(rtc, OMAP_RTC_PMIC_REG);
+	rtc_writel(rtc, OMAP_RTC_PMIC_REG, val | OMAP_RTC_PMIC_POWER_EN_EN);
+
+	/* set alarm two seconds from now */
+	omap_rtc_read_time_raw(rtc, &tm);
+	bcd2tm(&tm);
+	rtc_tm_to_time(&tm, &now);
+	rtc_time_to_tm(now + 2, &tm);
+
+	if (tm2bcd(&tm) < 0) {
+		dev_err(&rtc->rtc->dev, "power off failed\n");
+		return;
+	}
+
+	rtc_wait_not_busy(rtc);
+
+	rtc_write(rtc, OMAP_RTC_ALARM2_SECONDS_REG, tm.tm_sec);
+	rtc_write(rtc, OMAP_RTC_ALARM2_MINUTES_REG, tm.tm_min);
+	rtc_write(rtc, OMAP_RTC_ALARM2_HOURS_REG, tm.tm_hour);
+	rtc_write(rtc, OMAP_RTC_ALARM2_DAYS_REG, tm.tm_mday);
+	rtc_write(rtc, OMAP_RTC_ALARM2_MONTHS_REG, tm.tm_mon);
+	rtc_write(rtc, OMAP_RTC_ALARM2_YEARS_REG, tm.tm_year);
+
+	/*
+	 * enable ALARM2 interrupt
+	 *
+	 * NOTE: this fails on AM3352 if rtc_write (writeb) is used
+	 */
+	val = rtc_read(rtc, OMAP_RTC_INTERRUPTS_REG);
+	rtc_writel(rtc, OMAP_RTC_INTERRUPTS_REG,
+			val | OMAP_RTC_INTERRUPTS_IT_ALARM2);
+	rtc->type->lock(rtc);
+
+	/*
+	 * Wait for alarm to trigger (within two seconds) and external PMIC to
+	 * power off the system. Add a 500 ms margin for external latencies
+	 * (e.g. debounce circuits).
+	 */
+	mdelay(2500);
+}
+
+static struct rtc_class_ops omap_rtc_ops = {
+	.read_time	= omap_rtc_read_time,
+	.set_time	= omap_rtc_set_time,
+	.read_alarm	= omap_rtc_read_alarm,
+	.set_alarm	= omap_rtc_set_alarm,
+	.alarm_irq_enable = omap_rtc_alarm_irq_enable,
+};
+
+static const struct omap_rtc_device_type omap_rtc_default_type = {
+	.has_power_up_reset = true,
+	.lock		= default_rtc_lock,
+	.unlock		= default_rtc_unlock,
+};
+
+static const struct omap_rtc_device_type omap_rtc_am3352_type = {
+	.has_32kclk_en	= true,
+	.has_irqwakeen	= true,
+	.has_pmic_mode	= true,
+	.lock		= am3352_rtc_lock,
+	.unlock		= am3352_rtc_unlock,
+};
+
+static const struct omap_rtc_device_type omap_rtc_da830_type = {
+	.lock		= am3352_rtc_lock,
+	.unlock		= am3352_rtc_unlock,
+};
+
+static const struct platform_device_id omap_rtc_id_table[] = {
+	{
+		.name	= "omap_rtc",
+		.driver_data = (kernel_ulong_t)&omap_rtc_default_type,
+	}, {
+		.name	= "am3352-rtc",
+		.driver_data = (kernel_ulong_t)&omap_rtc_am3352_type,
+	}, {
+		.name	= "da830-rtc",
+		.driver_data = (kernel_ulong_t)&omap_rtc_da830_type,
+	}, {
+		/* sentinel */
+	}
+};
+MODULE_DEVICE_TABLE(platform, omap_rtc_id_table);
+
+static const struct of_device_id omap_rtc_of_match[] = {
+	{
+		.compatible	= "ti,am3352-rtc",
+		.data		= &omap_rtc_am3352_type,
+	}, {
+		.compatible	= "ti,da830-rtc",
+		.data		= &omap_rtc_da830_type,
+	}, {
+		/* sentinel */
+	}
+};
+MODULE_DEVICE_TABLE(of, omap_rtc_of_match);
+
+static int omap_rtc_probe(struct platform_device *pdev)
+{
+	struct omap_rtc	*rtc;
+	struct resource	*res;
+	u8 reg, mask, new_ctrl;
+	const struct platform_device_id *id_entry;
+	const struct of_device_id *of_id;
+	int ret;
+
+	rtc = devm_kzalloc(&pdev->dev, sizeof(*rtc), GFP_KERNEL);
+	if (!rtc)
+		return -ENOMEM;
+
+	of_id = of_match_device(omap_rtc_of_match, &pdev->dev);
+	if (of_id) {
+		rtc->type = of_id->data;
+		rtc->is_pmic_controller = rtc->type->has_pmic_mode &&
+				of_property_read_bool(pdev->dev.of_node,
+						"system-power-controller");
+	} else {
+		id_entry = platform_get_device_id(pdev);
+		rtc->type = (void *)id_entry->driver_data;
+	}
+
+	rtc->irq_timer = platform_get_irq(pdev, 0);
+	if (rtc->irq_timer <= 0)
+		return -ENOENT;
+
+	rtc->irq_alarm = platform_get_irq(pdev, 1);
+	if (rtc->irq_alarm <= 0)
+		return -ENOENT;
+
+	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+	rtc->base = devm_ioremap_resource(&pdev->dev, res);
+	if (IS_ERR(rtc->base))
+		return PTR_ERR(rtc->base);
+
+	platform_set_drvdata(pdev, rtc);
+
+	/* Enable the clock/module so that we can access the registers */
+	pm_runtime_enable(&pdev->dev);
+	pm_runtime_get_sync(&pdev->dev);
+
+	rtc->type->unlock(rtc);
+
+	/*
+	 * disable interrupts
+	 *
+	 * NOTE: ALARM2 is not cleared on AM3352 if rtc_write (writeb) is used
+	 */
+	rtc_writel(rtc, OMAP_RTC_INTERRUPTS_REG, 0);
+
+	/* enable RTC functional clock */
+	if (rtc->type->has_32kclk_en) {
+		reg = rtc_read(rtc, OMAP_RTC_OSC_REG);
+		rtc_writel(rtc, OMAP_RTC_OSC_REG,
+				reg | OMAP_RTC_OSC_32KCLK_EN);
+	}
+
+	/* clear old status */
+	reg = rtc_read(rtc, OMAP_RTC_STATUS_REG);
+
+	mask = OMAP_RTC_STATUS_ALARM;
+
+	if (rtc->type->has_pmic_mode)
+		mask |= OMAP_RTC_STATUS_ALARM2;
+
+	if (rtc->type->has_power_up_reset) {
+		mask |= OMAP_RTC_STATUS_POWER_UP;
+		if (reg & OMAP_RTC_STATUS_POWER_UP)
+			dev_info(&pdev->dev, "RTC power up reset detected\n");
+	}
+
+	if (reg & mask)
+		rtc_write(rtc, OMAP_RTC_STATUS_REG, reg & mask);
+
+	/* On boards with split power, RTC_ON_NOFF won't reset the RTC */
+	reg = rtc_read(rtc, OMAP_RTC_CTRL_REG);
+	if (reg & OMAP_RTC_CTRL_STOP)
+		dev_info(&pdev->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(&pdev->dev, "split power mode\n");
+
+	if (reg != new_ctrl)
+		rtc_write(rtc, OMAP_RTC_CTRL_REG, new_ctrl);
+
+	rtc->type->lock(rtc);
+
+	device_init_wakeup(&pdev->dev, true);
+
+	rtc->rtc = devm_rtc_device_register(&pdev->dev, pdev->name,
+			&omap_rtc_ops, THIS_MODULE);
+	if (IS_ERR(rtc->rtc)) {
+		ret = PTR_ERR(rtc->rtc);
+		goto err;
+	}
+
+	/* handle periodic and alarm irqs */
+	ret = devm_request_irq(&pdev->dev, rtc->irq_timer, rtc_irq, 0,
+			dev_name(&rtc->rtc->dev), rtc);
+	if (ret)
+		goto err;
+
+	if (rtc->irq_timer != rtc->irq_alarm) {
+		ret = devm_request_irq(&pdev->dev, rtc->irq_alarm, rtc_irq, 0,
+				dev_name(&rtc->rtc->dev), rtc);
+		if (ret)
+			goto err;
+	}
+
+	if (rtc->is_pmic_controller) {
+		if (!pm_power_off) {
+			omap_rtc_power_off_rtc = rtc;
+			pm_power_off = omap_rtc_power_off;
+		}
+	}
+
+	return 0;
+
+err:
+	device_init_wakeup(&pdev->dev, false);
+	rtc->type->lock(rtc);
+	pm_runtime_put_sync(&pdev->dev);
+	pm_runtime_disable(&pdev->dev);
+
+	return ret;
+}
+
+static int __exit omap_rtc_remove(struct platform_device *pdev)
+{
+	struct omap_rtc *rtc = platform_get_drvdata(pdev);
+
+	if (pm_power_off == omap_rtc_power_off &&
+			omap_rtc_power_off_rtc == rtc) {
+		pm_power_off = NULL;
+		omap_rtc_power_off_rtc = NULL;
+	}
+
+	device_init_wakeup(&pdev->dev, 0);
+
+	rtc->type->unlock(rtc);
+	/* leave rtc running, but disable irqs */
+	rtc_write(rtc, OMAP_RTC_INTERRUPTS_REG, 0);
+
+	rtc->type->lock(rtc);
+
+	/* Disable the clock/module */
+	pm_runtime_put_sync(&pdev->dev);
+	pm_runtime_disable(&pdev->dev);
+
+	return 0;
+}
+
+#ifdef CONFIG_PM_SLEEP
+static int omap_rtc_suspend(struct device *dev)
+{
+	struct omap_rtc *rtc = dev_get_drvdata(dev);
+
+	rtc->interrupts_reg = rtc_read(rtc, OMAP_RTC_INTERRUPTS_REG);
+
+	rtc->type->unlock(rtc);
+	/*
+	 * FIXME: the RTC alarm is not currently acting as a wakeup event
+	 * source on some platforms, and in fact this enable() call is just
+	 * saving a flag that's never used...
+	 */
+	if (device_may_wakeup(dev))
+		enable_irq_wake(rtc->irq_alarm);
+	else
+		rtc_write(rtc, OMAP_RTC_INTERRUPTS_REG, 0);
+	rtc->type->lock(rtc);
+
+	/* Disable the clock/module */
+	pm_runtime_put_sync(dev);
+
+	return 0;
+}
+
+static int omap_rtc_resume(struct device *dev)
+{
+	struct omap_rtc *rtc = dev_get_drvdata(dev);
+
+	/* Enable the clock/module so that we can access the registers */
+	pm_runtime_get_sync(dev);
+
+	rtc->type->unlock(rtc);
+	if (device_may_wakeup(dev))
+		disable_irq_wake(rtc->irq_alarm);
+	else
+		rtc_write(rtc, OMAP_RTC_INTERRUPTS_REG, rtc->interrupts_reg);
+	rtc->type->lock(rtc);
+
+	return 0;
+}
+#endif
+
+static SIMPLE_DEV_PM_OPS(omap_rtc_pm_ops, omap_rtc_suspend, omap_rtc_resume);
+
+static void omap_rtc_shutdown(struct platform_device *pdev)
+{
+	struct omap_rtc *rtc = platform_get_drvdata(pdev);
+	u8 mask;
+
+	/*
+	 * Keep the ALARM interrupt enabled to allow the system to power up on
+	 * alarm events.
+	 */
+	rtc->type->unlock(rtc);
+	mask = rtc_read(rtc, OMAP_RTC_INTERRUPTS_REG);
+	mask &= OMAP_RTC_INTERRUPTS_IT_ALARM;
+	rtc_write(rtc, OMAP_RTC_INTERRUPTS_REG, mask);
+	rtc->type->lock(rtc);
+}
+
+static struct platform_driver omap_rtc_driver = {
+	.probe		= omap_rtc_probe,
+	.remove		= __exit_p(omap_rtc_remove),
+	.shutdown	= omap_rtc_shutdown,
+	.driver		= {
+		.name	= "omap_rtc",
+		.pm	= &omap_rtc_pm_ops,
+		.of_match_table = omap_rtc_of_match,
+	},
+	.id_table	= omap_rtc_id_table,
+};
+
+module_platform_driver(omap_rtc_driver);
+
+MODULE_ALIAS("platform:omap_rtc");
+MODULE_AUTHOR("George G. Davis (and others)");
+MODULE_LICENSE("GPL");