Adding upstream version 6.1.76.upstream/6.1.76upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 657 insertions, 0 deletions

diff --git a/drivers/rtc/rtc-twl.c b/drivers/rtc/rtc-twl.c
new file mode 100644
index 000000000..c24d1e18f
--- /dev/null
+++ b/drivers/rtc/rtc-twl.c
@@ -0,0 +1,657 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * rtc-twl.c -- TWL Real Time Clock interface
+ *
+ * Copyright (C) 2007 MontaVista Software, Inc
+ * Author: Alexandre Rusev <source@mvista.com>
+ *
+ * Based on original TI driver twl4030-rtc.c
+ *   Copyright (C) 2006 Texas Instruments, Inc.
+ *
+ * Based on rtc-omap.c
+ *   Copyright (C) 2003 MontaVista Software, Inc.
+ *   Author: George G. Davis <gdavis@mvista.com> or <source@mvista.com>
+ *   Copyright (C) 2006 David Brownell
+ */
+
+#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
+
+#include <linux/kernel.h>
+#include <linux/errno.h>
+#include <linux/init.h>
+#include <linux/module.h>
+#include <linux/types.h>
+#include <linux/rtc.h>
+#include <linux/bcd.h>
+#include <linux/platform_device.h>
+#include <linux/interrupt.h>
+#include <linux/of.h>
+
+#include <linux/mfd/twl.h>
+
+enum twl_class {
+	TWL_4030 = 0,
+	TWL_6030,
+};
+
+/*
+ * RTC block register offsets (use TWL_MODULE_RTC)
+ */
+enum {
+	REG_SECONDS_REG = 0,
+	REG_MINUTES_REG,
+	REG_HOURS_REG,
+	REG_DAYS_REG,
+	REG_MONTHS_REG,
+	REG_YEARS_REG,
+	REG_WEEKS_REG,
+
+	REG_ALARM_SECONDS_REG,
+	REG_ALARM_MINUTES_REG,
+	REG_ALARM_HOURS_REG,
+	REG_ALARM_DAYS_REG,
+	REG_ALARM_MONTHS_REG,
+	REG_ALARM_YEARS_REG,
+
+	REG_RTC_CTRL_REG,
+	REG_RTC_STATUS_REG,
+	REG_RTC_INTERRUPTS_REG,
+
+	REG_RTC_COMP_LSB_REG,
+	REG_RTC_COMP_MSB_REG,
+};
+static const u8 twl4030_rtc_reg_map[] = {
+	[REG_SECONDS_REG] = 0x00,
+	[REG_MINUTES_REG] = 0x01,
+	[REG_HOURS_REG] = 0x02,
+	[REG_DAYS_REG] = 0x03,
+	[REG_MONTHS_REG] = 0x04,
+	[REG_YEARS_REG] = 0x05,
+	[REG_WEEKS_REG] = 0x06,
+
+	[REG_ALARM_SECONDS_REG] = 0x07,
+	[REG_ALARM_MINUTES_REG] = 0x08,
+	[REG_ALARM_HOURS_REG] = 0x09,
+	[REG_ALARM_DAYS_REG] = 0x0A,
+	[REG_ALARM_MONTHS_REG] = 0x0B,
+	[REG_ALARM_YEARS_REG] = 0x0C,
+
+	[REG_RTC_CTRL_REG] = 0x0D,
+	[REG_RTC_STATUS_REG] = 0x0E,
+	[REG_RTC_INTERRUPTS_REG] = 0x0F,
+
+	[REG_RTC_COMP_LSB_REG] = 0x10,
+	[REG_RTC_COMP_MSB_REG] = 0x11,
+};
+static const u8 twl6030_rtc_reg_map[] = {
+	[REG_SECONDS_REG] = 0x00,
+	[REG_MINUTES_REG] = 0x01,
+	[REG_HOURS_REG] = 0x02,
+	[REG_DAYS_REG] = 0x03,
+	[REG_MONTHS_REG] = 0x04,
+	[REG_YEARS_REG] = 0x05,
+	[REG_WEEKS_REG] = 0x06,
+
+	[REG_ALARM_SECONDS_REG] = 0x08,
+	[REG_ALARM_MINUTES_REG] = 0x09,
+	[REG_ALARM_HOURS_REG] = 0x0A,
+	[REG_ALARM_DAYS_REG] = 0x0B,
+	[REG_ALARM_MONTHS_REG] = 0x0C,
+	[REG_ALARM_YEARS_REG] = 0x0D,
+
+	[REG_RTC_CTRL_REG] = 0x10,
+	[REG_RTC_STATUS_REG] = 0x11,
+	[REG_RTC_INTERRUPTS_REG] = 0x12,
+
+	[REG_RTC_COMP_LSB_REG] = 0x13,
+	[REG_RTC_COMP_MSB_REG] = 0x14,
+};
+
+/* RTC_CTRL_REG bitfields */
+#define BIT_RTC_CTRL_REG_STOP_RTC_M              0x01
+#define BIT_RTC_CTRL_REG_ROUND_30S_M             0x02
+#define BIT_RTC_CTRL_REG_AUTO_COMP_M             0x04
+#define BIT_RTC_CTRL_REG_MODE_12_24_M            0x08
+#define BIT_RTC_CTRL_REG_TEST_MODE_M             0x10
+#define BIT_RTC_CTRL_REG_SET_32_COUNTER_M        0x20
+#define BIT_RTC_CTRL_REG_GET_TIME_M              0x40
+#define BIT_RTC_CTRL_REG_RTC_V_OPT               0x80
+
+/* RTC_STATUS_REG bitfields */
+#define BIT_RTC_STATUS_REG_RUN_M                 0x02
+#define BIT_RTC_STATUS_REG_1S_EVENT_M            0x04
+#define BIT_RTC_STATUS_REG_1M_EVENT_M            0x08
+#define BIT_RTC_STATUS_REG_1H_EVENT_M            0x10
+#define BIT_RTC_STATUS_REG_1D_EVENT_M            0x20
+#define BIT_RTC_STATUS_REG_ALARM_M               0x40
+#define BIT_RTC_STATUS_REG_POWER_UP_M            0x80
+
+/* RTC_INTERRUPTS_REG bitfields */
+#define BIT_RTC_INTERRUPTS_REG_EVERY_M           0x03
+#define BIT_RTC_INTERRUPTS_REG_IT_TIMER_M        0x04
+#define BIT_RTC_INTERRUPTS_REG_IT_ALARM_M        0x08
+
+
+/* REG_SECONDS_REG through REG_YEARS_REG is how many registers? */
+#define ALL_TIME_REGS		6
+
+/*----------------------------------------------------------------------*/
+struct twl_rtc {
+	struct device *dev;
+	struct rtc_device *rtc;
+	u8 *reg_map;
+	/*
+	 * Cache the value for timer/alarm interrupts register; this is
+	 * only changed by callers holding rtc ops lock (or resume).
+	 */
+	unsigned char rtc_irq_bits;
+	bool wake_enabled;
+#ifdef CONFIG_PM_SLEEP
+	unsigned char irqstat;
+#endif
+	enum twl_class class;
+};
+
+/*
+ * Supports 1 byte read from TWL RTC register.
+ */
+static int twl_rtc_read_u8(struct twl_rtc *twl_rtc, u8 *data, u8 reg)
+{
+	int ret;
+
+	ret = twl_i2c_read_u8(TWL_MODULE_RTC, data, (twl_rtc->reg_map[reg]));
+	if (ret < 0)
+		pr_err("Could not read TWL register %X - error %d\n", reg, ret);
+	return ret;
+}
+
+/*
+ * Supports 1 byte write to TWL RTC registers.
+ */
+static int twl_rtc_write_u8(struct twl_rtc *twl_rtc, u8 data, u8 reg)
+{
+	int ret;
+
+	ret = twl_i2c_write_u8(TWL_MODULE_RTC, data, (twl_rtc->reg_map[reg]));
+	if (ret < 0)
+		pr_err("Could not write TWL register %X - error %d\n",
+		       reg, ret);
+	return ret;
+}
+
+/*
+ * Enable 1/second update and/or alarm interrupts.
+ */
+static int set_rtc_irq_bit(struct twl_rtc *twl_rtc, unsigned char bit)
+{
+	unsigned char val;
+	int ret;
+
+	/* if the bit is set, return from here */
+	if (twl_rtc->rtc_irq_bits & bit)
+		return 0;
+
+	val = twl_rtc->rtc_irq_bits | bit;
+	val &= ~BIT_RTC_INTERRUPTS_REG_EVERY_M;
+	ret = twl_rtc_write_u8(twl_rtc, val, REG_RTC_INTERRUPTS_REG);
+	if (ret == 0)
+		twl_rtc->rtc_irq_bits = val;
+
+	return ret;
+}
+
+/*
+ * Disable update and/or alarm interrupts.
+ */
+static int mask_rtc_irq_bit(struct twl_rtc *twl_rtc, unsigned char bit)
+{
+	unsigned char val;
+	int ret;
+
+	/* if the bit is clear, return from here */
+	if (!(twl_rtc->rtc_irq_bits & bit))
+		return 0;
+
+	val = twl_rtc->rtc_irq_bits & ~bit;
+	ret = twl_rtc_write_u8(twl_rtc, val, REG_RTC_INTERRUPTS_REG);
+	if (ret == 0)
+		twl_rtc->rtc_irq_bits = val;
+
+	return ret;
+}
+
+static int twl_rtc_alarm_irq_enable(struct device *dev, unsigned enabled)
+{
+	struct platform_device *pdev = to_platform_device(dev);
+	struct twl_rtc *twl_rtc = dev_get_drvdata(dev);
+	int irq = platform_get_irq(pdev, 0);
+	int ret;
+
+	if (enabled) {
+		ret = set_rtc_irq_bit(twl_rtc,
+				      BIT_RTC_INTERRUPTS_REG_IT_ALARM_M);
+		if (device_can_wakeup(dev) && !twl_rtc->wake_enabled) {
+			enable_irq_wake(irq);
+			twl_rtc->wake_enabled = true;
+		}
+	} else {
+		ret = mask_rtc_irq_bit(twl_rtc,
+				       BIT_RTC_INTERRUPTS_REG_IT_ALARM_M);
+		if (twl_rtc->wake_enabled) {
+			disable_irq_wake(irq);
+			twl_rtc->wake_enabled = false;
+		}
+	}
+
+	return ret;
+}
+
+/*
+ * Gets current TWL RTC time and date parameters.
+ *
+ * The RTC's time/alarm representation is not what gmtime(3) requires
+ * Linux to use:
+ *
+ *  - Months are 1..12 vs Linux 0-11
+ *  - Years are 0..99 vs Linux 1900..N (we assume 21st century)
+ */
+static int twl_rtc_read_time(struct device *dev, struct rtc_time *tm)
+{
+	struct twl_rtc *twl_rtc = dev_get_drvdata(dev);
+	unsigned char rtc_data[ALL_TIME_REGS];
+	int ret;
+	u8 save_control;
+	u8 rtc_control;
+
+	ret = twl_rtc_read_u8(twl_rtc, &save_control, REG_RTC_CTRL_REG);
+	if (ret < 0) {
+		dev_err(dev, "%s: reading CTRL_REG, error %d\n", __func__, ret);
+		return ret;
+	}
+	/* for twl6030/32 make sure BIT_RTC_CTRL_REG_GET_TIME_M is clear */
+	if (twl_rtc->class == TWL_6030) {
+		if (save_control & BIT_RTC_CTRL_REG_GET_TIME_M) {
+			save_control &= ~BIT_RTC_CTRL_REG_GET_TIME_M;
+			ret = twl_rtc_write_u8(twl_rtc, save_control,
+					       REG_RTC_CTRL_REG);
+			if (ret < 0) {
+				dev_err(dev, "%s clr GET_TIME, error %d\n",
+					__func__, ret);
+				return ret;
+			}
+		}
+	}
+
+	/* Copy RTC counting registers to static registers or latches */
+	rtc_control = save_control | BIT_RTC_CTRL_REG_GET_TIME_M;
+
+	/* for twl6030/32 enable read access to static shadowed registers */
+	if (twl_rtc->class == TWL_6030)
+		rtc_control |= BIT_RTC_CTRL_REG_RTC_V_OPT;
+
+	ret = twl_rtc_write_u8(twl_rtc, rtc_control, REG_RTC_CTRL_REG);
+	if (ret < 0) {
+		dev_err(dev, "%s: writing CTRL_REG, error %d\n", __func__, ret);
+		return ret;
+	}
+
+	ret = twl_i2c_read(TWL_MODULE_RTC, rtc_data,
+			(twl_rtc->reg_map[REG_SECONDS_REG]), ALL_TIME_REGS);
+
+	if (ret < 0) {
+		dev_err(dev, "%s: reading data, error %d\n", __func__, ret);
+		return ret;
+	}
+
+	/* for twl6030 restore original state of rtc control register */
+	if (twl_rtc->class == TWL_6030) {
+		ret = twl_rtc_write_u8(twl_rtc, save_control, REG_RTC_CTRL_REG);
+		if (ret < 0) {
+			dev_err(dev, "%s: restore CTRL_REG, error %d\n",
+				__func__, ret);
+			return ret;
+		}
+	}
+
+	tm->tm_sec = bcd2bin(rtc_data[0]);
+	tm->tm_min = bcd2bin(rtc_data[1]);
+	tm->tm_hour = bcd2bin(rtc_data[2]);
+	tm->tm_mday = bcd2bin(rtc_data[3]);
+	tm->tm_mon = bcd2bin(rtc_data[4]) - 1;
+	tm->tm_year = bcd2bin(rtc_data[5]) + 100;
+
+	return ret;
+}
+
+static int twl_rtc_set_time(struct device *dev, struct rtc_time *tm)
+{
+	struct twl_rtc *twl_rtc = dev_get_drvdata(dev);
+	unsigned char save_control;
+	unsigned char rtc_data[ALL_TIME_REGS];
+	int ret;
+
+	rtc_data[0] = bin2bcd(tm->tm_sec);
+	rtc_data[1] = bin2bcd(tm->tm_min);
+	rtc_data[2] = bin2bcd(tm->tm_hour);
+	rtc_data[3] = bin2bcd(tm->tm_mday);
+	rtc_data[4] = bin2bcd(tm->tm_mon + 1);
+	rtc_data[5] = bin2bcd(tm->tm_year - 100);
+
+	/* Stop RTC while updating the TC registers */
+	ret = twl_rtc_read_u8(twl_rtc, &save_control, REG_RTC_CTRL_REG);
+	if (ret < 0)
+		goto out;
+
+	save_control &= ~BIT_RTC_CTRL_REG_STOP_RTC_M;
+	ret = twl_rtc_write_u8(twl_rtc, save_control, REG_RTC_CTRL_REG);
+	if (ret < 0)
+		goto out;
+
+	/* update all the time registers in one shot */
+	ret = twl_i2c_write(TWL_MODULE_RTC, rtc_data,
+		(twl_rtc->reg_map[REG_SECONDS_REG]), ALL_TIME_REGS);
+	if (ret < 0) {
+		dev_err(dev, "rtc_set_time error %d\n", ret);
+		goto out;
+	}
+
+	/* Start back RTC */
+	save_control |= BIT_RTC_CTRL_REG_STOP_RTC_M;
+	ret = twl_rtc_write_u8(twl_rtc, save_control, REG_RTC_CTRL_REG);
+
+out:
+	return ret;
+}
+
+/*
+ * Gets current TWL RTC alarm time.
+ */
+static int twl_rtc_read_alarm(struct device *dev, struct rtc_wkalrm *alm)
+{
+	struct twl_rtc *twl_rtc = dev_get_drvdata(dev);
+	unsigned char rtc_data[ALL_TIME_REGS];
+	int ret;
+
+	ret = twl_i2c_read(TWL_MODULE_RTC, rtc_data,
+			twl_rtc->reg_map[REG_ALARM_SECONDS_REG], ALL_TIME_REGS);
+	if (ret < 0) {
+		dev_err(dev, "rtc_read_alarm error %d\n", ret);
+		return ret;
+	}
+
+	/* some of these fields may be wildcard/"match all" */
+	alm->time.tm_sec = bcd2bin(rtc_data[0]);
+	alm->time.tm_min = bcd2bin(rtc_data[1]);
+	alm->time.tm_hour = bcd2bin(rtc_data[2]);
+	alm->time.tm_mday = bcd2bin(rtc_data[3]);
+	alm->time.tm_mon = bcd2bin(rtc_data[4]) - 1;
+	alm->time.tm_year = bcd2bin(rtc_data[5]) + 100;
+
+	/* report cached alarm enable state */
+	if (twl_rtc->rtc_irq_bits & BIT_RTC_INTERRUPTS_REG_IT_ALARM_M)
+		alm->enabled = 1;
+
+	return ret;
+}
+
+static int twl_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *alm)
+{
+	struct twl_rtc *twl_rtc = dev_get_drvdata(dev);
+
+	unsigned char alarm_data[ALL_TIME_REGS];
+	int ret;
+
+	ret = twl_rtc_alarm_irq_enable(dev, 0);
+	if (ret)
+		goto out;
+
+	alarm_data[0] = bin2bcd(alm->time.tm_sec);
+	alarm_data[1] = bin2bcd(alm->time.tm_min);
+	alarm_data[2] = bin2bcd(alm->time.tm_hour);
+	alarm_data[3] = bin2bcd(alm->time.tm_mday);
+	alarm_data[4] = bin2bcd(alm->time.tm_mon + 1);
+	alarm_data[5] = bin2bcd(alm->time.tm_year - 100);
+
+	/* update all the alarm registers in one shot */
+	ret = twl_i2c_write(TWL_MODULE_RTC, alarm_data,
+			twl_rtc->reg_map[REG_ALARM_SECONDS_REG], ALL_TIME_REGS);
+	if (ret) {
+		dev_err(dev, "rtc_set_alarm error %d\n", ret);
+		goto out;
+	}
+
+	if (alm->enabled)
+		ret = twl_rtc_alarm_irq_enable(dev, 1);
+out:
+	return ret;
+}
+
+static irqreturn_t twl_rtc_interrupt(int irq, void *data)
+{
+	struct twl_rtc *twl_rtc = data;
+	unsigned long events;
+	int ret = IRQ_NONE;
+	int res;
+	u8 rd_reg;
+
+	res = twl_rtc_read_u8(twl_rtc, &rd_reg, REG_RTC_STATUS_REG);
+	if (res)
+		goto out;
+	/*
+	 * Figure out source of interrupt: ALARM or TIMER in RTC_STATUS_REG.
+	 * only one (ALARM or RTC) interrupt source may be enabled
+	 * at time, we also could check our results
+	 * by reading RTS_INTERRUPTS_REGISTER[IT_TIMER,IT_ALARM]
+	 */
+	if (rd_reg & BIT_RTC_STATUS_REG_ALARM_M)
+		events = RTC_IRQF | RTC_AF;
+	else
+		events = RTC_IRQF | RTC_PF;
+
+	res = twl_rtc_write_u8(twl_rtc, BIT_RTC_STATUS_REG_ALARM_M,
+			       REG_RTC_STATUS_REG);
+	if (res)
+		goto out;
+
+	if (twl_rtc->class == TWL_4030) {
+		/* Clear on Read enabled. RTC_IT bit of TWL4030_INT_PWR_ISR1
+		 * needs 2 reads to clear the interrupt. One read is done in
+		 * do_twl_pwrirq(). Doing the second read, to clear
+		 * the bit.
+		 *
+		 * FIXME the reason PWR_ISR1 needs an extra read is that
+		 * RTC_IF retriggered until we cleared REG_ALARM_M above.
+		 * But re-reading like this is a bad hack; by doing so we
+		 * risk wrongly clearing status for some other IRQ (losing
+		 * the interrupt).  Be smarter about handling RTC_UF ...
+		 */
+		res = twl_i2c_read_u8(TWL4030_MODULE_INT,
+			&rd_reg, TWL4030_INT_PWR_ISR1);
+		if (res)
+			goto out;
+	}
+
+	/* Notify RTC core on event */
+	rtc_update_irq(twl_rtc->rtc, 1, events);
+
+	ret = IRQ_HANDLED;
+out:
+	return ret;
+}
+
+static const struct rtc_class_ops twl_rtc_ops = {
+	.read_time	= twl_rtc_read_time,
+	.set_time	= twl_rtc_set_time,
+	.read_alarm	= twl_rtc_read_alarm,
+	.set_alarm	= twl_rtc_set_alarm,
+	.alarm_irq_enable = twl_rtc_alarm_irq_enable,
+};
+
+/*----------------------------------------------------------------------*/
+
+static int twl_rtc_probe(struct platform_device *pdev)
+{
+	struct twl_rtc *twl_rtc;
+	struct device_node *np = pdev->dev.of_node;
+	int ret = -EINVAL;
+	int irq = platform_get_irq(pdev, 0);
+	u8 rd_reg;
+
+	if (!np) {
+		dev_err(&pdev->dev, "no DT info\n");
+		return -EINVAL;
+	}
+
+	if (irq <= 0)
+		return ret;
+
+	twl_rtc = devm_kzalloc(&pdev->dev, sizeof(*twl_rtc), GFP_KERNEL);
+	if (!twl_rtc)
+		return -ENOMEM;
+
+	if (twl_class_is_4030()) {
+		twl_rtc->class = TWL_4030;
+		twl_rtc->reg_map = (u8 *)twl4030_rtc_reg_map;
+	} else if (twl_class_is_6030()) {
+		twl_rtc->class = TWL_6030;
+		twl_rtc->reg_map = (u8 *)twl6030_rtc_reg_map;
+	} else {
+		dev_err(&pdev->dev, "TWL Class not supported.\n");
+		return -EINVAL;
+	}
+
+	ret = twl_rtc_read_u8(twl_rtc, &rd_reg, REG_RTC_STATUS_REG);
+	if (ret < 0)
+		return ret;
+
+	if (rd_reg & BIT_RTC_STATUS_REG_POWER_UP_M)
+		dev_warn(&pdev->dev, "Power up reset detected.\n");
+
+	if (rd_reg & BIT_RTC_STATUS_REG_ALARM_M)
+		dev_warn(&pdev->dev, "Pending Alarm interrupt detected.\n");
+
+	/* Clear RTC Power up reset and pending alarm interrupts */
+	ret = twl_rtc_write_u8(twl_rtc, rd_reg, REG_RTC_STATUS_REG);
+	if (ret < 0)
+		return ret;
+
+	if (twl_rtc->class == TWL_6030) {
+		twl6030_interrupt_unmask(TWL6030_RTC_INT_MASK,
+			REG_INT_MSK_LINE_A);
+		twl6030_interrupt_unmask(TWL6030_RTC_INT_MASK,
+			REG_INT_MSK_STS_A);
+	}
+
+	dev_info(&pdev->dev, "Enabling TWL-RTC\n");
+	ret = twl_rtc_write_u8(twl_rtc, BIT_RTC_CTRL_REG_STOP_RTC_M,
+			       REG_RTC_CTRL_REG);
+	if (ret < 0)
+		return ret;
+
+	/* ensure interrupts are disabled, bootloaders can be strange */
+	ret = twl_rtc_write_u8(twl_rtc, 0, REG_RTC_INTERRUPTS_REG);
+	if (ret < 0)
+		dev_warn(&pdev->dev, "unable to disable interrupt\n");
+
+	/* init cached IRQ enable bits */
+	ret = twl_rtc_read_u8(twl_rtc, &twl_rtc->rtc_irq_bits,
+			      REG_RTC_INTERRUPTS_REG);
+	if (ret < 0)
+		return ret;
+
+	platform_set_drvdata(pdev, twl_rtc);
+	device_init_wakeup(&pdev->dev, 1);
+
+	twl_rtc->rtc = devm_rtc_device_register(&pdev->dev, pdev->name,
+					&twl_rtc_ops, THIS_MODULE);
+	if (IS_ERR(twl_rtc->rtc)) {
+		dev_err(&pdev->dev, "can't register RTC device, err %ld\n",
+			PTR_ERR(twl_rtc->rtc));
+		return PTR_ERR(twl_rtc->rtc);
+	}
+
+	ret = devm_request_threaded_irq(&pdev->dev, irq, NULL,
+					twl_rtc_interrupt,
+					IRQF_TRIGGER_RISING | IRQF_ONESHOT,
+					dev_name(&twl_rtc->rtc->dev), twl_rtc);
+	if (ret < 0) {
+		dev_err(&pdev->dev, "IRQ is not free.\n");
+		return ret;
+	}
+
+	return 0;
+}
+
+/*
+ * Disable all TWL RTC module interrupts.
+ * Sets status flag to free.
+ */
+static int twl_rtc_remove(struct platform_device *pdev)
+{
+	struct twl_rtc *twl_rtc = platform_get_drvdata(pdev);
+
+	/* leave rtc running, but disable irqs */
+	mask_rtc_irq_bit(twl_rtc, BIT_RTC_INTERRUPTS_REG_IT_ALARM_M);
+	mask_rtc_irq_bit(twl_rtc, BIT_RTC_INTERRUPTS_REG_IT_TIMER_M);
+	if (twl_rtc->class == TWL_6030) {
+		twl6030_interrupt_mask(TWL6030_RTC_INT_MASK,
+			REG_INT_MSK_LINE_A);
+		twl6030_interrupt_mask(TWL6030_RTC_INT_MASK,
+			REG_INT_MSK_STS_A);
+	}
+
+	return 0;
+}
+
+static void twl_rtc_shutdown(struct platform_device *pdev)
+{
+	struct twl_rtc *twl_rtc = platform_get_drvdata(pdev);
+
+	/* mask timer interrupts, but leave alarm interrupts on to enable
+	   power-on when alarm is triggered */
+	mask_rtc_irq_bit(twl_rtc, BIT_RTC_INTERRUPTS_REG_IT_TIMER_M);
+}
+
+#ifdef CONFIG_PM_SLEEP
+static int twl_rtc_suspend(struct device *dev)
+{
+	struct twl_rtc *twl_rtc = dev_get_drvdata(dev);
+
+	twl_rtc->irqstat = twl_rtc->rtc_irq_bits;
+
+	mask_rtc_irq_bit(twl_rtc, BIT_RTC_INTERRUPTS_REG_IT_TIMER_M);
+	return 0;
+}
+
+static int twl_rtc_resume(struct device *dev)
+{
+	struct twl_rtc *twl_rtc = dev_get_drvdata(dev);
+
+	set_rtc_irq_bit(twl_rtc, twl_rtc->irqstat);
+	return 0;
+}
+#endif
+
+static SIMPLE_DEV_PM_OPS(twl_rtc_pm_ops, twl_rtc_suspend, twl_rtc_resume);
+
+static const struct of_device_id twl_rtc_of_match[] = {
+	{.compatible = "ti,twl4030-rtc", },
+	{ },
+};
+MODULE_DEVICE_TABLE(of, twl_rtc_of_match);
+
+static struct platform_driver twl4030rtc_driver = {
+	.probe		= twl_rtc_probe,
+	.remove		= twl_rtc_remove,
+	.shutdown	= twl_rtc_shutdown,
+	.driver		= {
+		.name		= "twl_rtc",
+		.pm		= &twl_rtc_pm_ops,
+		.of_match_table = twl_rtc_of_match,
+	},
+};
+
+module_platform_driver(twl4030rtc_driver);
+
+MODULE_AUTHOR("Texas Instruments, MontaVista Software");
+MODULE_LICENSE("GPL");