ARM: drivers/rtc/rtc-at91rm9200.c: disable interrupts at shutdown
Make sure RTC-interrupts are disabled at shutdown. As the RTC is generally powered by backup power (VDDBU), its interrupts are not disabled on wake-up, user, watchdog or software reset. This could cause troubles on other systems (e.g. older kernels) if an interrupt occurs before a handler has been installed at next boot. Let us be well-behaved and disable them on clean shutdowns at least (as do the RTT-based rtc-at91sam9 driver). Signed-off-by: Johan Hovold <jhovold@gmail.com> Acked-by: Nicolas Ferre <nicolas.ferre@atmel.com> Cc: Jean-Christophe Plagniol-Villard <plagnioj@jcrosoft.com> Cc: Andrew Victor <linux@maxim.org.za> Cc: Alessandro Zummo <a.zummo@towertech.it> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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@ -428,6 +428,14 @@ static int __exit at91_rtc_remove(struct platform_device *pdev)
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return 0;
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}
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static void at91_rtc_shutdown(struct platform_device *pdev)
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{
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/* Disable all interrupts */
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at91_rtc_write(AT91_RTC_IDR, AT91_RTC_ACKUPD | AT91_RTC_ALARM |
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AT91_RTC_SECEV | AT91_RTC_TIMEV |
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AT91_RTC_CALEV);
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}
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#ifdef CONFIG_PM_SLEEP
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/* AT91RM9200 RTC Power management control */
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@ -466,6 +474,7 @@ static SIMPLE_DEV_PM_OPS(at91_rtc_pm_ops, at91_rtc_suspend, at91_rtc_resume);
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static struct platform_driver at91_rtc_driver = {
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.remove = __exit_p(at91_rtc_remove),
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.shutdown = at91_rtc_shutdown,
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.driver = {
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.name = "at91_rtc",
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.owner = THIS_MODULE,
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