4 files changed, 582 insertions, 1 deletions

diff --git a/arch/arm/mach-omap1/devices.c b/arch/arm/mach-omap1/devices.c
index a611c3b63954..6dcd10ab4496 100644
--- a/arch/arm/mach-omap1/devices.c
+++ b/arch/arm/mach-omap1/devices.c
@@ -55,7 +55,7 @@ static inline void omap_init_irda(void) {}
 
 /*-------------------------------------------------------------------------*/
 
-#if     defined(CONFIG_OMAP_RTC) || defined(CONFIG_OMAP_RTC)
+#if defined(CONFIG_RTC_DRV_OMAP) || defined(CONFIG_RTC_DRV_OMAP_MODULE)
 
 #define OMAP_RTC_BASE           0xfffb4800
 
diff --git a/drivers/rtc/Kconfig b/drivers/rtc/Kconfig
index fc766a7a611e..4d32bad79f1b 100644
--- a/drivers/rtc/Kconfig
+++ b/drivers/rtc/Kconfig
@@ -163,6 +163,14 @@ config RTC_DRV_DS1742
           This driver can also be built as a module. If so, the module
           will be called rtc-ds1742.
 
+config RTC_DRV_OMAP
+        tristate "TI OMAP1"
+        depends on RTC_CLASS && ( \
+                ARCH_OMAP15XX || ARCH_OMAP16XX || ARCH_OMAP730 )
+        help
+          Say "yes" here to support the real time clock on TI OMAP1 chips.
+          This driver can also be built as a module called rtc-omap.
+
 config RTC_DRV_PCF8563
         tristate "Philips PCF8563/Epson RTC8564"
         depends on RTC_CLASS && I2C
diff --git a/drivers/rtc/Makefile b/drivers/rtc/Makefile
index 3ba5ff6e6800..bd4c45d333f0 100644
--- a/drivers/rtc/Makefile
+++ b/drivers/rtc/Makefile
@@ -21,6 +21,7 @@ obj-$(CONFIG_RTC_DRV_TEST)	+= rtc-test.o
 obj-$(CONFIG_RTC_DRV_DS1307)    += rtc-ds1307.o
 obj-$(CONFIG_RTC_DRV_DS1672)    += rtc-ds1672.o
 obj-$(CONFIG_RTC_DRV_DS1742)    += rtc-ds1742.o
+obj-$(CONFIG_RTC_DRV_OMAP)      += rtc-omap.o
 obj-$(CONFIG_RTC_DRV_PCF8563)   += rtc-pcf8563.o
 obj-$(CONFIG_RTC_DRV_PCF8583)   += rtc-pcf8583.o
 obj-$(CONFIG_RTC_DRV_RS5C372)   += rtc-rs5c372.o
diff --git a/drivers/rtc/rtc-omap.c b/drivers/rtc/rtc-omap.c
new file mode 100644
index 000000000000..eac5fb1fc02f
--- /dev/null
+++ b/drivers/rtc/rtc-omap.c
@@ -0,0 +1,572 @@
+/*
+ * TI OMAP1 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)
+ *
+ * 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 <asm/io.h>
+#include <asm/mach/time.h>
+
+
+/* The OMAP1 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).  See the BOARD-SPECIFIC CUSTOMIZATION comment.
+ */
+
+#define OMAP_RTC_BASE                   0xfffb4800
+
+/* 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
+
+/* OMAP_RTC_CTRL_REG bit fields: */
+#define OMAP_RTC_CTRL_SPLIT             (1<<7)
+#define OMAP_RTC_CTRL_DISABLE           (1<<6)
+#define OMAP_RTC_CTRL_SET_32_COUNTER    (1<<5)
+#define OMAP_RTC_CTRL_TEST              (1<<4)
+#define OMAP_RTC_CTRL_MODE_12_24        (1<<3)
+#define OMAP_RTC_CTRL_AUTO_COMP         (1<<2)
+#define OMAP_RTC_CTRL_ROUND_30S         (1<<1)
+#define OMAP_RTC_CTRL_STOP              (1<<0)
+
+/* OMAP_RTC_STATUS_REG bit fields: */
+#define OMAP_RTC_STATUS_POWER_UP        (1<<7)
+#define OMAP_RTC_STATUS_ALARM           (1<<6)
+#define OMAP_RTC_STATUS_1D_EVENT        (1<<5)
+#define OMAP_RTC_STATUS_1H_EVENT        (1<<4)
+#define OMAP_RTC_STATUS_1M_EVENT        (1<<3)
+#define OMAP_RTC_STATUS_1S_EVENT        (1<<2)
+#define OMAP_RTC_STATUS_RUN             (1<<1)
+#define OMAP_RTC_STATUS_BUSY            (1<<0)
+
+/* OMAP_RTC_INTERRUPTS_REG bit fields: */
+#define OMAP_RTC_INTERRUPTS_IT_ALARM    (1<<3)
+#define OMAP_RTC_INTERRUPTS_IT_TIMER    (1<<2)
+
+
+#define rtc_read(addr)          omap_readb(OMAP_RTC_BASE + (addr))
+#define rtc_write(val, addr)    omap_writeb(val, OMAP_RTC_BASE + (addr))
+
+
+/* platform_bus isn't hotpluggable, so for static linkage it'd be safe
+ * to get rid of probe() and remove() code ... too bad the driver struct
+ * remembers probe(), that's about 25% of the runtime footprint!!
+ */
+#ifndef MODULE
+#undef  __devexit
+#undef  __devexit_p
+#define __devexit       __exit
+#define __devexit_p     __exit_p
+#endif
+
+
+/* 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(void)
+{
+        int     count = 0;
+        u8      status;
+
+        /* BUSY may stay active for 1/32768 second (~30 usec) */
+        for (count = 0; count < 50; count++) {
+                status = rtc_read(OMAP_RTC_STATUS_REG);
+                if ((status & (u8)OMAP_RTC_STATUS_BUSY) == 0)
+                        break;
+                udelay(1);
+        }
+        /* now we have ~15 usec to read/write various registers */
+}
+
+static irqreturn_t rtc_irq(int irq, void *class_dev)
+{
+        unsigned long           events = 0;
+        u8                      irq_data;
+
+        irq_data = rtc_read(OMAP_RTC_STATUS_REG);
+
+        /* alarm irq? */
+        if (irq_data & OMAP_RTC_STATUS_ALARM) {
+                rtc_write(OMAP_RTC_STATUS_ALARM, OMAP_RTC_STATUS_REG);
+                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(class_dev, 1, events);
+
+        return IRQ_HANDLED;
+}
+
+#ifdef  CONFIG_RTC_INTF_DEV
+
+static int
+omap_rtc_ioctl(struct device *dev, unsigned int cmd, unsigned long arg)
+{
+        u8 reg;
+
+        switch (cmd) {
+        case RTC_AIE_OFF:
+        case RTC_AIE_ON:
+        case RTC_UIE_OFF:
+        case RTC_UIE_ON:
+                break;
+        default:
+                return -ENOIOCTLCMD;
+        }
+
+        local_irq_disable();
+        rtc_wait_not_busy();
+        reg = rtc_read(OMAP_RTC_INTERRUPTS_REG);
+        switch (cmd) {
+        /* AIE = Alarm Interrupt Enable */
+        case RTC_AIE_OFF:
+                reg &= ~OMAP_RTC_INTERRUPTS_IT_ALARM;
+                break;
+        case RTC_AIE_ON:
+                reg |= OMAP_RTC_INTERRUPTS_IT_ALARM;
+                break;
+        /* UIE = Update Interrupt Enable (1/second) */
+        case RTC_UIE_OFF:
+                reg &= ~OMAP_RTC_INTERRUPTS_IT_TIMER;
+                break;
+        case RTC_UIE_ON:
+                reg |= OMAP_RTC_INTERRUPTS_IT_TIMER;
+                break;
+        }
+        rtc_wait_not_busy();
+        rtc_write(reg, OMAP_RTC_INTERRUPTS_REG);
+        local_irq_enable();
+
+        return 0;
+}
+
+#else
+#define omap_rtc_ioctl  NULL
+#endif
+
+/* 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 int omap_rtc_read_time(struct device *dev, struct rtc_time *tm)
+{
+        /* we don't report wday/yday/isdst ... */
+        local_irq_disable();
+        rtc_wait_not_busy();
+
+        tm->tm_sec = rtc_read(OMAP_RTC_SECONDS_REG);
+        tm->tm_min = rtc_read(OMAP_RTC_MINUTES_REG);
+        tm->tm_hour = rtc_read(OMAP_RTC_HOURS_REG);
+        tm->tm_mday = rtc_read(OMAP_RTC_DAYS_REG);
+        tm->tm_mon = rtc_read(OMAP_RTC_MONTHS_REG);
+        tm->tm_year = rtc_read(OMAP_RTC_YEARS_REG);
+
+        local_irq_enable();
+
+        bcd2tm(tm);
+        return 0;
+}
+
+static int omap_rtc_set_time(struct device *dev, struct rtc_time *tm)
+{
+        if (tm2bcd(tm) < 0)
+                return -EINVAL;
+        local_irq_disable();
+        rtc_wait_not_busy();
+
+        rtc_write(tm->tm_year, OMAP_RTC_YEARS_REG);
+        rtc_write(tm->tm_mon, OMAP_RTC_MONTHS_REG);
+        rtc_write(tm->tm_mday, OMAP_RTC_DAYS_REG);
+        rtc_write(tm->tm_hour, OMAP_RTC_HOURS_REG);
+        rtc_write(tm->tm_min, OMAP_RTC_MINUTES_REG);
+        rtc_write(tm->tm_sec, OMAP_RTC_SECONDS_REG);
+
+        local_irq_enable();
+
+        return 0;
+}
+
+static int omap_rtc_read_alarm(struct device *dev, struct rtc_wkalrm *alm)
+{
+        local_irq_disable();
+        rtc_wait_not_busy();
+
+        alm->time.tm_sec = rtc_read(OMAP_RTC_ALARM_SECONDS_REG);
+        alm->time.tm_min = rtc_read(OMAP_RTC_ALARM_MINUTES_REG);
+        alm->time.tm_hour = rtc_read(OMAP_RTC_ALARM_HOURS_REG);
+        alm->time.tm_mday = rtc_read(OMAP_RTC_ALARM_DAYS_REG);
+        alm->time.tm_mon = rtc_read(OMAP_RTC_ALARM_MONTHS_REG);
+        alm->time.tm_year = rtc_read(OMAP_RTC_ALARM_YEARS_REG);
+
+        local_irq_enable();
+
+        bcd2tm(&alm->time);
+        alm->pending = !!(rtc_read(OMAP_RTC_INTERRUPTS_REG)
+                        & OMAP_RTC_INTERRUPTS_IT_ALARM);
+        alm->enabled = alm->pending && device_may_wakeup(dev);
+
+        return 0;
+}
+
+static int omap_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *alm)
+{
+        u8 reg;
+
+        /* Much userspace code uses RTC_ALM_SET, thus "don't care" for
+         * day/month/year specifies alarms up to 24 hours in the future.
+         * So we need to handle that ... but let's ignore the "don't care"
+         * values for hours/minutes/seconds.
+         */
+        if (alm->time.tm_mday <= 0
+                        && alm->time.tm_mon < 0
+                        && alm->time.tm_year < 0) {
+                struct rtc_time tm;
+                unsigned long now, then;
+
+                omap_rtc_read_time(dev, &tm);
+                rtc_tm_to_time(&tm, &now);
+
+                alm->time.tm_mday = tm.tm_mday;
+                alm->time.tm_mon = tm.tm_mon;
+                alm->time.tm_year = tm.tm_year;
+                rtc_tm_to_time(&alm->time, &then);
+
+                /* sometimes the alarm wraps into tomorrow */
+                if (then < now) {
+                        rtc_time_to_tm(now + 24 * 60 * 60, &tm);
+                        alm->time.tm_mday = tm.tm_mday;
+                        alm->time.tm_mon = tm.tm_mon;
+                        alm->time.tm_year = tm.tm_year;
+                }
+        }
+
+        if (tm2bcd(&alm->time) < 0)
+                return -EINVAL;
+
+        local_irq_disable();
+        rtc_wait_not_busy();
+
+        rtc_write(alm->time.tm_year, OMAP_RTC_ALARM_YEARS_REG);
+        rtc_write(alm->time.tm_mon, OMAP_RTC_ALARM_MONTHS_REG);
+        rtc_write(alm->time.tm_mday, OMAP_RTC_ALARM_DAYS_REG);
+        rtc_write(alm->time.tm_hour, OMAP_RTC_ALARM_HOURS_REG);
+        rtc_write(alm->time.tm_min, OMAP_RTC_ALARM_MINUTES_REG);
+        rtc_write(alm->time.tm_sec, OMAP_RTC_ALARM_SECONDS_REG);
+
+        reg = rtc_read(OMAP_RTC_INTERRUPTS_REG);
+        if (alm->enabled)
+                reg |= OMAP_RTC_INTERRUPTS_IT_ALARM;
+        else
+                reg &= ~OMAP_RTC_INTERRUPTS_IT_ALARM;
+        rtc_write(reg, OMAP_RTC_INTERRUPTS_REG);
+
+        local_irq_enable();
+
+        return 0;
+}
+
+static struct rtc_class_ops omap_rtc_ops = {
+        .ioctl          = omap_rtc_ioctl,
+        .read_time      = omap_rtc_read_time,
+        .set_time       = omap_rtc_set_time,
+        .read_alarm     = omap_rtc_read_alarm,
+        .set_alarm      = omap_rtc_set_alarm,
+};
+
+static int omap_rtc_alarm;
+static int omap_rtc_timer;
+
+static int __devinit omap_rtc_probe(struct platform_device *pdev)
+{
+        struct resource         *res, *mem;
+        struct rtc_device       *rtc;
+        u8                      reg, new_ctrl;
+
+        omap_rtc_timer = platform_get_irq(pdev, 0);
+        if (omap_rtc_timer <= 0) {
+                pr_debug("%s: no update irq?\n", pdev->name);
+                return -ENOENT;
+        }
+
+        omap_rtc_alarm = platform_get_irq(pdev, 1);
+        if (omap_rtc_alarm <= 0) {
+                pr_debug("%s: no alarm irq?\n", pdev->name);
+                return -ENOENT;
+        }
+
+        /* NOTE:  using static mapping for RTC registers */
+        res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+        if (res && res->start != OMAP_RTC_BASE) {
+                pr_debug("%s: RTC registers at %08x, expected %08x\n",
+                        pdev->name, (unsigned) res->start, OMAP_RTC_BASE);
+                return -ENOENT;
+        }
+
+        if (res)
+                mem = request_mem_region(res->start,
+                                res->end - res->start + 1,
+                                pdev->name);
+        else
+                mem = NULL;
+        if (!mem) {
+                pr_debug("%s: RTC registers at %08x are not free\n",
+                        pdev->name, OMAP_RTC_BASE);
+                return -EBUSY;
+        }
+
+        rtc = rtc_device_register(pdev->name, &pdev->dev,
+                        &omap_rtc_ops, THIS_MODULE);
+        if (IS_ERR(rtc)) {
+                pr_debug("%s: can't register RTC device, err %ld\n",
+                        pdev->name, PTR_ERR(rtc));
+                goto fail;
+        }
+        platform_set_drvdata(pdev, rtc);
+        class_set_devdata(&rtc->class_dev, mem);
+
+        /* clear pending irqs, and set 1/second periodic,
+         * which we'll use instead of update irqs
+         */
+        rtc_write(0, OMAP_RTC_INTERRUPTS_REG);
+
+        /* clear old status */
+        reg = rtc_read(OMAP_RTC_STATUS_REG);
+        if (reg & (u8) OMAP_RTC_STATUS_POWER_UP) {
+                pr_info("%s: RTC power up reset detected\n",
+                        pdev->name);
+                rtc_write(OMAP_RTC_STATUS_POWER_UP, OMAP_RTC_STATUS_REG);
+        }
+        if (reg & (u8) OMAP_RTC_STATUS_ALARM)
+                rtc_write(OMAP_RTC_STATUS_ALARM, OMAP_RTC_STATUS_REG);
+
+        /* handle periodic and alarm irqs */
+        if (request_irq(omap_rtc_timer, rtc_irq, SA_INTERRUPT,
+                        rtc->class_dev.class_id, &rtc->class_dev)) {
+                pr_debug("%s: RTC timer interrupt IRQ%d already claimed\n",
+                        pdev->name, omap_rtc_timer);
+                goto fail0;
+        }
+        if (request_irq(omap_rtc_alarm, rtc_irq, SA_INTERRUPT,
+                        rtc->class_dev.class_id, &rtc->class_dev)) {
+                pr_debug("%s: RTC alarm interrupt IRQ%d already claimed\n",
+                        pdev->name, omap_rtc_alarm);
+                goto fail1;
+        }
+
+        /* On boards with split power, RTC_ON_NOFF won't reset the RTC */
+        reg = rtc_read(OMAP_RTC_CTRL_REG);
+        if (reg & (u8) OMAP_RTC_CTRL_STOP)
+                pr_info("%s: already running\n", pdev->name);
+
+        /* 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:
+         *
+         *  - Boards wired so that RTC_WAKE_INT does something, and muxed
+         *    right (W13_1610_RTC_WAKE_INT is the default after chip reset),
+         *    should initialize the device wakeup flag appropriately.
+         *
+         *  - 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...)
+         */
+        device_init_wakeup(&pdev->dev, 0);
+
+        if (new_ctrl & (u8) OMAP_RTC_CTRL_SPLIT)
+                pr_info("%s: split power mode\n", pdev->name);
+
+        if (reg != new_ctrl)
+                rtc_write(new_ctrl, OMAP_RTC_CTRL_REG);
+
+        return 0;
+
+fail1:
+        free_irq(omap_rtc_timer, NULL);
+fail0:
+        rtc_device_unregister(rtc);
+fail:
+        release_resource(mem);
+        return -EIO;
+}
+
+static int __devexit omap_rtc_remove(struct platform_device *pdev)
+{
+        struct rtc_device       *rtc = platform_get_drvdata(pdev);;
+
+        device_init_wakeup(&pdev->dev, 0);
+
+        /* leave rtc running, but disable irqs */
+        rtc_write(0, OMAP_RTC_INTERRUPTS_REG);
+
+        free_irq(omap_rtc_timer, rtc);
+        free_irq(omap_rtc_alarm, rtc);
+
+        release_resource(class_get_devdata(&rtc->class_dev));
+        rtc_device_unregister(rtc);
+        return 0;
+}
+
+#ifdef CONFIG_PM
+
+static struct timespec rtc_delta;
+static u8 irqstat;
+
+static int omap_rtc_suspend(struct platform_device *pdev, pm_message_t state)
+{
+        struct rtc_time rtc_tm;
+        struct timespec time;
+
+        time.tv_nsec = 0;
+        omap_rtc_read_time(NULL, &rtc_tm);
+        rtc_tm_to_time(&rtc_tm, &time.tv_sec);
+
+        save_time_delta(&rtc_delta, &time);
+        irqstat = rtc_read(OMAP_RTC_INTERRUPTS_REG);
+
+        /* FIXME the RTC alarm is not currently acting as a wakeup event
+         * source, and in fact this enable() call is just saving a flag
+         * that's never used...
+         */
+        if (device_may_wakeup(&pdev->dev))
+                enable_irq_wake(omap_rtc_alarm);
+        else
+                rtc_write(0, OMAP_RTC_INTERRUPTS_REG);
+
+        return 0;
+}
+
+static int omap_rtc_resume(struct platform_device *pdev)
+{
+        struct rtc_time rtc_tm;
+        struct timespec time;
+
+        time.tv_nsec = 0;
+        omap_rtc_read_time(NULL, &rtc_tm);
+        rtc_tm_to_time(&rtc_tm, &time.tv_sec);
+
+        restore_time_delta(&rtc_delta, &time);
+        if (device_may_wakeup(&pdev->dev))
+                disable_irq_wake(omap_rtc_alarm);
+        else
+                rtc_write(irqstat, OMAP_RTC_INTERRUPTS_REG);
+        return 0;
+}
+
+#else
+#define omap_rtc_suspend NULL
+#define omap_rtc_resume  NULL
+#endif
+
+static void omap_rtc_shutdown(struct platform_device *pdev)
+{
+        rtc_write(0, OMAP_RTC_INTERRUPTS_REG);
+}
+
+MODULE_ALIAS("omap_rtc");
+static struct platform_driver omap_rtc_driver = {
+        .probe          = omap_rtc_probe,
+        .remove         = __devexit_p(omap_rtc_remove),
+        .suspend        = omap_rtc_suspend,
+        .resume         = omap_rtc_resume,
+        .shutdown       = omap_rtc_shutdown,
+        .driver         = {
+                .name   = "omap_rtc",
+                .owner  = THIS_MODULE,
+        },
+};
+
+static int __init rtc_init(void)
+{
+        return platform_driver_register(&omap_rtc_driver);
+}
+module_init(rtc_init);
+
+static void __exit rtc_exit(void)
+{
+        platform_driver_unregister(&omap_rtc_driver);
+}
+module_exit(rtc_exit);
+
+MODULE_AUTHOR("George G. Davis (and others)");
+MODULE_LICENSE("GPL");