Gitweb:     
http://git.kernel.org/git/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commit;h=4cdf854f7d60498bbda436068a118b95059b244b
Commit:     4cdf854f7d60498bbda436068a118b95059b244b
Parent:     f618258ad8af0413f08af60bd0eb050562e700fa
Author:     David Brownell <[EMAIL PROTECTED]>
AuthorDate: Wed Feb 6 01:38:59 2008 -0800
Committer:  Linus Torvalds <[EMAIL PROTECTED]>
CommitDate: Wed Feb 6 10:41:14 2008 -0800

    rtc: at91sam9 RTC support (RTT and/or RTC)
    
    AT91sam9 RTC support, primarily in the form of an RTT-as-RTC driver that was
    extracted from 2.6.23-at91 patch and updated:
    
     - Relies on now-merged platform updates, which associate the RTT
       hardware address with each RTT and use the "at91_rtt" name.
    
     - RTC framework related fixes and cleanups, notably:
        * removed now-needless suspend/resume clock offset logic
        * alarm read/write now respects the "enabled" flag
        * suspend always disables update irqs
        * shutdown (and startup) disables all irqs
    
     - Misc cleanup:
        * use dev_*() messaging
        * add comments
        * remove globals,
        * ... etc
    
     - Don't force use of RTT0 and GPBR0.  Either resource may need
       to be used for other purposes (like NO_HZ support).
    
     - Update "AT91RM9200 RTC" Kconfig to allow it on SAM9RL chips
       (it has both RTT and RTC).
    
    Driver binding uses bus_find_device() to avoid needing any kind of "timer
    library" code when there's more than one RTT module.  (This timer can be 
used
    as an RTC, to support NO_HZ operation, or potentially for other stuff.  The
    choice is a per-system policy.)
    
    Signed-off-by: David Brownell <[EMAIL PROTECTED]>
    Cc: Michel Benoit <[EMAIL PROTECTED]>
    Cc: Nicolas Ferre <[EMAIL PROTECTED]>
    Cc: Andrew Victor <[EMAIL PROTECTED]>
    Cc: Russell King <[EMAIL PROTECTED]>
    Signed-off-by: Andrew Morton <[EMAIL PROTECTED]>
    Signed-off-by: Linus Torvalds <[EMAIL PROTECTED]>
---
 drivers/rtc/Kconfig        |   45 ++++-
 drivers/rtc/Makefile       |    1 +
 drivers/rtc/rtc-at91sam9.c |  520 ++++++++++++++++++++++++++++++++++++++++++++
 3 files changed, 562 insertions(+), 4 deletions(-)

diff --git a/drivers/rtc/Kconfig b/drivers/rtc/Kconfig
index 484de8e..6402d69 100644
--- a/drivers/rtc/Kconfig
+++ b/drivers/rtc/Kconfig
@@ -469,10 +469,47 @@ config RTC_DRV_AT32AP700X
          AT32AP700x family processors.
 
 config RTC_DRV_AT91RM9200
-       tristate "AT91RM9200"
-       depends on ARCH_AT91RM9200
-       help
-         Driver for the Atmel AT91RM9200's internal RTC (Realtime Clock).
+       tristate "AT91RM9200 or AT91SAM9RL"
+       depends on ARCH_AT91RM9200 || ARCH_AT91SAM9RL
+       help
+         Driver for the internal RTC (Realtime Clock) module found on
+         Atmel AT91RM9200's and AT91SAM9RL chips.  On SAM9RL chips
+         this is powered by the backup power supply.
+
+config RTC_DRV_AT91SAM9
+       tristate "AT91SAM9x"
+       depends on ARCH_AT91 && !(ARCH_AT91RM9200 || ARCH_AT91X40)
+       help
+         RTC driver for the Atmel AT91SAM9x internal RTT (Real Time Timer).
+         These timers are powered by the backup power supply (such as a
+         small coin cell battery), but do not need to be used as RTCs.
+
+         (On AT91SAM9rl chips you probably want to use the dedicated RTC
+         module and leave the RTT available for other uses.)
+
+config RTC_DRV_AT91SAM9_RTT
+       int
+       range 0 1
+       default 0
+       prompt "RTT module Number" if ARCH_AT91SAM9263
+       depends on RTC_DRV_AT91SAM9
+       help
+         More than one RTT module is available.  You can choose which
+         one will be used as an RTC.  The default of zero is normally
+         OK to use, though some systems use that for non-RTC purposes.
+
+config RTC_DRV_AT91SAM9_GPBR
+       int
+       range 0 3 if !ARCH_AT91SAM9263
+       range 0 15 if ARCH_AT91SAM9263
+       default 0
+       prompt "Backup Register Number"
+       depends on RTC_DRV_AT91SAM9
+       help
+         The RTC driver needs to use one of the General Purpose Backup
+         Registers (GPBRs) as well as the RTT.  You can choose which one
+         will be used.  The default of zero is normally OK to use, but
+         on some systems other software needs to use that register.
 
 config RTC_DRV_BFIN
        tristate "Blackfin On-Chip RTC"
diff --git a/drivers/rtc/Makefile b/drivers/rtc/Makefile
index 81f7c9a..ec703f3 100644
--- a/drivers/rtc/Makefile
+++ b/drivers/rtc/Makefile
@@ -19,6 +19,7 @@ rtc-core-$(CONFIG_RTC_INTF_SYSFS) += rtc-sysfs.o
 
 obj-$(CONFIG_RTC_DRV_AT32AP700X)+= rtc-at32ap700x.o
 obj-$(CONFIG_RTC_DRV_AT91RM9200)+= rtc-at91rm9200.o
+obj-$(CONFIG_RTC_DRV_AT91SAM9) += rtc-at91sam9.o
 obj-$(CONFIG_RTC_DRV_BFIN)     += rtc-bfin.o
 obj-$(CONFIG_RTC_DRV_CMOS)     += rtc-cmos.o
 obj-$(CONFIG_RTC_DRV_DS1216)   += rtc-ds1216.o
diff --git a/drivers/rtc/rtc-at91sam9.c b/drivers/rtc/rtc-at91sam9.c
new file mode 100644
index 0000000..bbf10ec
--- /dev/null
+++ b/drivers/rtc/rtc-at91sam9.c
@@ -0,0 +1,520 @@
+/*
+ * "RTT as Real Time Clock" driver for AT91SAM9 SoC family
+ *
+ * (C) 2007 Michel Benoit
+ *
+ * Based on rtc-at91rm9200.c by Rick Bronson
+ *
+ * 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/module.h>
+#include <linux/kernel.h>
+#include <linux/platform_device.h>
+#include <linux/time.h>
+#include <linux/rtc.h>
+#include <linux/interrupt.h>
+#include <linux/ioctl.h>
+
+#include <asm/mach/time.h>
+#include <asm/arch/board.h>
+#include <asm/arch/at91_rtt.h>
+
+
+/*
+ * This driver uses two configurable hardware resources that live in the
+ * AT91SAM9 backup power domain (intended to be powered at all times)
+ * to implement the Real Time Clock interfaces
+ *
+ *  - A "Real-time Timer" (RTT) counts up in seconds from a base time.
+ *    We can't assign the counter value (CRTV) ... but we can reset it.
+ *
+ *  - One of the "General Purpose Backup Registers" (GPBRs) holds the
+ *    base time, normally an offset from the beginning of the POSIX
+ *    epoch (1970-Jan-1 00:00:00 UTC).  Some systems also include the
+ *    local timezone's offset.
+ *
+ * The RTC's value is the RTT counter plus that offset.  The RTC's alarm
+ * is likewise a base (ALMV) plus that offset.
+ *
+ * Not all RTTs will be used as RTCs; some systems have multiple RTTs to
+ * choose from, or a "real" RTC module.  All systems have multiple GPBR
+ * registers available, likewise usable for more than "RTC" support.
+ */
+
+/*
+ * We store ALARM_DISABLED in ALMV to record that no alarm is set.
+ * It's also the reset value for that field.
+ */
+#define ALARM_DISABLED ((u32)~0)
+
+
+struct sam9_rtc {
+       void __iomem            *rtt;
+       struct rtc_device       *rtcdev;
+       u32                     imr;
+};
+
+#define rtt_readl(rtc, field) \
+       __raw_readl((rtc)->rtt + AT91_RTT_ ## field)
+#define rtt_writel(rtc, field, val) \
+       __raw_writel((val), (rtc)->rtt + AT91_RTT_ ## field)
+
+#define gpbr_readl(rtc) \
+       at91_sys_read(AT91_GPBR + 4 * CONFIG_RTC_DRV_AT91SAM9_GPBR)
+#define gpbr_writel(rtc, val) \
+       at91_sys_write(AT91_GPBR + 4 * CONFIG_RTC_DRV_AT91SAM9_GPBR, (val))
+
+/*
+ * Read current time and date in RTC
+ */
+static int at91_rtc_readtime(struct device *dev, struct rtc_time *tm)
+{
+       struct sam9_rtc *rtc = dev_get_drvdata(dev);
+       u32 secs, secs2;
+       u32 offset;
+
+       /* read current time offset */
+       offset = gpbr_readl(rtc);
+       if (offset == 0)
+               return -EILSEQ;
+
+       /* reread the counter to help sync the two clock domains */
+       secs = rtt_readl(rtc, VR);
+       secs2 = rtt_readl(rtc, VR);
+       if (secs != secs2)
+               secs = rtt_readl(rtc, VR);
+
+       rtc_time_to_tm(offset + secs, tm);
+
+       dev_dbg(dev, "%s: %4d-%02d-%02d %02d:%02d:%02d\n", "readtime",
+               1900 + tm->tm_year, tm->tm_mon, tm->tm_mday,
+               tm->tm_hour, tm->tm_min, tm->tm_sec);
+
+       return 0;
+}
+
+/*
+ * Set current time and date in RTC
+ */
+static int at91_rtc_settime(struct device *dev, struct rtc_time *tm)
+{
+       struct sam9_rtc *rtc = dev_get_drvdata(dev);
+       int err;
+       u32 offset, alarm, mr;
+       unsigned long secs;
+
+       dev_dbg(dev, "%s: %4d-%02d-%02d %02d:%02d:%02d\n", "settime",
+               1900 + tm->tm_year, tm->tm_mon, tm->tm_mday,
+               tm->tm_hour, tm->tm_min, tm->tm_sec);
+
+       err = rtc_tm_to_time(tm, &secs);
+       if (err != 0)
+               return err;
+
+       mr = rtt_readl(rtc, MR);
+
+       /* disable interrupts */
+       rtt_writel(rtc, MR, mr & ~(AT91_RTT_ALMIEN | AT91_RTT_RTTINCIEN));
+
+       /* read current time offset */
+       offset = gpbr_readl(rtc);
+
+       /* store the new base time in a battery backup register */
+       secs += 1;
+       gpbr_writel(rtc, secs);
+
+       /* adjust the alarm time for the new base */
+       alarm = rtt_readl(rtc, AR);
+       if (alarm != ALARM_DISABLED) {
+               if (offset > secs) {
+                       /* time jumped backwards, increase time until alarm */
+                       alarm += (offset - secs);
+               } else if ((alarm + offset) > secs) {
+                       /* time jumped forwards, decrease time until alarm */
+                       alarm -= (secs - offset);
+               } else {
+                       /* time jumped past the alarm, disable alarm */
+                       alarm = ALARM_DISABLED;
+                       mr &= ~AT91_RTT_ALMIEN;
+               }
+               rtt_writel(rtc, AR, alarm);
+       }
+
+       /* reset the timer, and re-enable interrupts */
+       rtt_writel(rtc, MR, mr | AT91_RTT_RTTRST);
+
+       return 0;
+}
+
+static int at91_rtc_readalarm(struct device *dev, struct rtc_wkalrm *alrm)
+{
+       struct sam9_rtc *rtc = dev_get_drvdata(dev);
+       struct rtc_time *tm = &alrm->time;
+       u32 alarm = rtt_readl(rtc, AR);
+       u32 offset;
+
+       offset = gpbr_readl(rtc);
+       if (offset == 0)
+               return -EILSEQ;
+
+       memset(alrm, 0, sizeof(alrm));
+       if (alarm != ALARM_DISABLED && offset != 0) {
+               rtc_time_to_tm(offset + alarm, tm);
+
+               dev_dbg(dev, "%s: %4d-%02d-%02d %02d:%02d:%02d\n", "readalarm",
+                       1900 + tm->tm_year, tm->tm_mon, tm->tm_mday,
+                       tm->tm_hour, tm->tm_min, tm->tm_sec);
+
+               if (rtt_readl(rtc, MR) & AT91_RTT_ALMIEN)
+                       alrm->enabled = 1;
+       }
+
+       return 0;
+}
+
+static int at91_rtc_setalarm(struct device *dev, struct rtc_wkalrm *alrm)
+{
+       struct sam9_rtc *rtc = dev_get_drvdata(dev);
+       struct rtc_time *tm = &alrm->time;
+       unsigned long secs;
+       u32 offset;
+       u32 mr;
+       int err;
+
+       err = rtc_tm_to_time(tm, &secs);
+       if (err != 0)
+               return err;
+
+       offset = gpbr_readl(rtc);
+       if (offset == 0) {
+               /* time is not set */
+               return -EILSEQ;
+       }
+       mr = rtt_readl(rtc, MR);
+       rtt_writel(rtc, MR, mr & ~AT91_RTT_ALMIEN);
+
+       /* alarm in the past? finish and leave disabled */
+       if (secs <= offset) {
+               rtt_writel(rtc, AR, ALARM_DISABLED);
+               return 0;
+       }
+
+       /* else set alarm and maybe enable it */
+       rtt_writel(rtc, AR, secs - offset);
+       if (alrm->enabled)
+               rtt_writel(rtc, MR, mr | AT91_RTT_ALMIEN);
+
+       dev_dbg(dev, "%s: %4d-%02d-%02d %02d:%02d:%02d\n", "setalarm",
+               tm->tm_year, tm->tm_mon, tm->tm_mday, tm->tm_hour,
+               tm->tm_min, tm->tm_sec);
+
+       return 0;
+}
+
+/*
+ * Handle commands from user-space
+ */
+static int at91_rtc_ioctl(struct device *dev, unsigned int cmd,
+                       unsigned long arg)
+{
+       struct sam9_rtc *rtc = dev_get_drvdata(dev);
+       int ret = 0;
+       u32 mr = rtt_readl(rtc, MR);
+
+       dev_dbg(dev, "ioctl: cmd=%08x, arg=%08lx, mr %08x\n", cmd, arg, mr);
+
+       switch (cmd) {
+       case RTC_AIE_OFF:               /* alarm off */
+               rtt_writel(rtc, MR, mr & ~AT91_RTT_ALMIEN);
+               break;
+       case RTC_AIE_ON:                /* alarm on */
+               rtt_writel(rtc, MR, mr | AT91_RTT_ALMIEN);
+               break;
+       case RTC_UIE_OFF:               /* update off */
+               rtt_writel(rtc, MR, mr & ~AT91_RTT_RTTINCIEN);
+               break;
+       case RTC_UIE_ON:                /* update on */
+               rtt_writel(rtc, MR, mr | AT91_RTT_RTTINCIEN);
+               break;
+       default:
+               ret = -ENOIOCTLCMD;
+               break;
+       }
+
+       return ret;
+}
+
+/*
+ * Provide additional RTC information in /proc/driver/rtc
+ */
+static int at91_rtc_proc(struct device *dev, struct seq_file *seq)
+{
+       struct sam9_rtc *rtc = dev_get_drvdata(dev);
+       u32 mr = mr = rtt_readl(rtc, MR);
+
+       seq_printf(seq, "update_IRQ\t: %s\n",
+                       (mr & AT91_RTT_RTTINCIEN) ? "yes" : "no");
+       return 0;
+}
+
+/*
+ * IRQ handler for the RTC
+ */
+static irqreturn_t at91_rtc_interrupt(int irq, void *_rtc)
+{
+       struct sam9_rtc *rtc = _rtc;
+       u32 sr, mr;
+       unsigned long events = 0;
+
+       /* Shared interrupt may be for another device.  Note: reading
+        * SR clears it, so we must only read it in this irq handler!
+        */
+       mr = rtt_readl(rtc, MR) & (AT91_RTT_ALMIEN | AT91_RTT_RTTINCIEN);
+       sr = rtt_readl(rtc, SR) & mr;
+       if (!sr)
+               return IRQ_NONE;
+
+       /* alarm status */
+       if (sr & AT91_RTT_ALMS)
+               events |= (RTC_AF | RTC_IRQF);
+
+       /* timer update/increment */
+       if (sr & AT91_RTT_RTTINC)
+               events |= (RTC_UF | RTC_IRQF);
+
+       rtc_update_irq(rtc->rtcdev, 1, events);
+
+       pr_debug("%s: num=%ld, events=0x%02lx\n", __FUNCTION__,
+               events >> 8, events & 0x000000FF);
+
+       return IRQ_HANDLED;
+}
+
+static const struct rtc_class_ops at91_rtc_ops = {
+       .ioctl          = at91_rtc_ioctl,
+       .read_time      = at91_rtc_readtime,
+       .set_time       = at91_rtc_settime,
+       .read_alarm     = at91_rtc_readalarm,
+       .set_alarm      = at91_rtc_setalarm,
+       .proc           = at91_rtc_proc,
+};
+
+/*
+ * Initialize and install RTC driver
+ */
+static int __init at91_rtc_probe(struct platform_device *pdev)
+{
+       struct resource *r;
+       struct sam9_rtc *rtc;
+       int             ret;
+       u32             mr;
+
+       r = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+       if (!r)
+               return -ENODEV;
+
+       rtc = kzalloc(sizeof *rtc, GFP_KERNEL);
+       if (!rtc)
+               return -ENOMEM;
+
+       platform_set_drvdata(pdev, rtc);
+       rtc->rtt = (void __force __iomem *) (AT91_VA_BASE_SYS - AT91_BASE_SYS);
+       rtc->rtt += r->start;
+
+       mr = rtt_readl(rtc, MR);
+
+       /* unless RTT is counting at 1 Hz, re-initialize it */
+       if ((mr & AT91_RTT_RTPRES) != AT91_SLOW_CLOCK) {
+               mr = AT91_RTT_RTTRST | (AT91_SLOW_CLOCK & AT91_RTT_RTPRES);
+               gpbr_writel(rtc, 0);
+       }
+
+       /* disable all interrupts (same as on shutdown path) */
+       mr &= ~(AT91_RTT_ALMIEN | AT91_RTT_RTTINCIEN);
+       rtt_writel(rtc, MR, mr);
+
+       rtc->rtcdev = rtc_device_register(pdev->name, &pdev->dev,
+                               &at91_rtc_ops, THIS_MODULE);
+       if (IS_ERR(rtc->rtcdev)) {
+               ret = PTR_ERR(rtc->rtcdev);
+               goto fail;
+       }
+
+       /* register irq handler after we know what name we'll use */
+       ret = request_irq(AT91_ID_SYS, at91_rtc_interrupt,
+                               IRQF_DISABLED | IRQF_SHARED,
+                               rtc->rtcdev->dev.bus_id, rtc);
+       if (ret) {
+               dev_dbg(&pdev->dev, "can't share IRQ %d?\n", AT91_ID_SYS);
+               rtc_device_unregister(rtc->rtcdev);
+               goto fail;
+       }
+
+       /* NOTE:  sam9260 rev A silicon has a ROM bug which resets the
+        * RTT on at least some reboots.  If you have that chip, you must
+        * initialize the time from some external source like a GPS, wall
+        * clock, discrete RTC, etc
+        */
+
+       if (gpbr_readl(rtc) == 0)
+               dev_warn(&pdev->dev, "%s: SET TIME!\n",
+                               rtc->rtcdev->dev.bus_id);
+
+       return 0;
+
+fail:
+       platform_set_drvdata(pdev, NULL);
+       kfree(rtc);
+       return ret;
+}
+
+/*
+ * Disable and remove the RTC driver
+ */
+static int __exit at91_rtc_remove(struct platform_device *pdev)
+{
+       struct sam9_rtc *rtc = platform_get_drvdata(pdev);
+       u32             mr = rtt_readl(rtc, MR);
+
+       /* disable all interrupts */
+       rtt_writel(rtc, MR, mr & ~(AT91_RTT_ALMIEN | AT91_RTT_RTTINCIEN));
+       free_irq(AT91_ID_SYS, rtc);
+
+       rtc_device_unregister(rtc->rtcdev);
+
+       platform_set_drvdata(pdev, NULL);
+       kfree(rtc);
+       return 0;
+}
+
+static void at91_rtc_shutdown(struct platform_device *pdev)
+{
+       struct sam9_rtc *rtc = platform_get_drvdata(pdev);
+       u32             mr = rtt_readl(rtc, MR);
+
+       rtc->imr = mr & (AT91_RTT_ALMIEN | AT91_RTT_RTTINCIEN);
+       rtt_writel(rtc, MR, mr & ~rtc->imr);
+}
+
+#ifdef CONFIG_PM
+
+/* AT91SAM9 RTC Power management control */
+
+static int at91_rtc_suspend(struct platform_device *pdev,
+                                       pm_message_t state)
+{
+       struct sam9_rtc *rtc = platform_get_drvdata(pdev);
+       u32             mr = rtt_readl(rtc, MR);
+
+       /*
+        * This IRQ is shared with DBGU and other hardware which isn't
+        * necessarily a wakeup event source.
+        */
+       rtc->imr = mr & (AT91_RTT_ALMIEN | AT91_RTT_RTTINCIEN);
+       if (rtc->imr) {
+               if (device_may_wakeup(&pdev->dev) && (mr & AT91_RTT_ALMIEN)) {
+                       enable_irq_wake(AT91_ID_SYS);
+                       /* don't let RTTINC cause wakeups */
+                       if (mr & AT91_RTT_RTTINCIEN)
+                               rtt_writel(rtc, MR, mr & ~AT91_RTT_RTTINCIEN);
+               } else
+                       rtt_writel(rtc, MR, mr & ~rtc->imr);
+       }
+
+       return 0;
+}
+
+static int at91_rtc_resume(struct platform_device *pdev)
+{
+       struct sam9_rtc *rtc = platform_get_drvdata(pdev);
+       u32             mr;
+
+       if (rtc->imr) {
+               if (device_may_wakeup(&pdev->dev))
+                       disable_irq_wake(AT91_ID_SYS);
+               mr = rtt_readl(rtc, MR);
+               rtt_writel(rtc, MR, mr | rtc->imr);
+       }
+
+       return 0;
+}
+#else
+#define at91_rtc_suspend       NULL
+#define at91_rtc_resume                NULL
+#endif
+
+static struct platform_driver at91_rtc_driver = {
+       .driver.name    = "rtc-at91sam9",
+       .driver.owner   = THIS_MODULE,
+       .remove         = __exit_p(at91_rtc_remove),
+       .shutdown       = at91_rtc_shutdown,
+       .suspend        = at91_rtc_suspend,
+       .resume         = at91_rtc_resume,
+};
+
+/* Chips can have more than one RTT module, and they can be used for more
+ * than just RTCs.  So we can't just register as "the" RTT driver.
+ *
+ * A normal approach in such cases is to create a library to allocate and
+ * free the modules.  Here we just use bus_find_device() as like such a
+ * library, binding directly ... no runtime "library" footprint is needed.
+ */
+static int __init at91_rtc_match(struct device *dev, void *v)
+{
+       struct platform_device *pdev = to_platform_device(dev);
+       int ret;
+
+       /* continue searching if this isn't the RTT we need */
+       if (strcmp("at91_rtt", pdev->name) != 0
+                       || pdev->id != CONFIG_RTC_DRV_AT91SAM9_RTT)
+               goto fail;
+
+       /* else we found it ... but fail unless we can bind to the RTC driver */
+       if (dev->driver) {
+               dev_dbg(dev, "busy, can't use as RTC!\n");
+               goto fail;
+       }
+       dev->driver = &at91_rtc_driver.driver;
+       if (device_attach(dev) == 0) {
+               dev_dbg(dev, "can't attach RTC!\n");
+               goto fail;
+       }
+       ret = at91_rtc_probe(pdev);
+       if (ret == 0)
+               return true;
+
+       dev_dbg(dev, "RTC probe err %d!\n", ret);
+fail:
+       return false;
+}
+
+static int __init at91_rtc_init(void)
+{
+       int status;
+       struct device *rtc;
+
+       status = platform_driver_register(&at91_rtc_driver);
+       if (status)
+               return status;
+       rtc = bus_find_device(&platform_bus_type, NULL,
+                       NULL, at91_rtc_match);
+       if (!rtc)
+               platform_driver_unregister(&at91_rtc_driver);
+       return rtc ? 0 : -ENODEV;
+}
+module_init(at91_rtc_init);
+
+static void __exit at91_rtc_exit(void)
+{
+       platform_driver_unregister(&at91_rtc_driver);
+}
+module_exit(at91_rtc_exit);
+
+
+MODULE_AUTHOR("Michel Benoit");
+MODULE_DESCRIPTION("RTC driver for Atmel AT91SAM9x");
+MODULE_LICENSE("GPL");
-
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