drivers/rtc/rtc-omap.c: add rtc wakeup support to alarm events
On some platforms (like AM33xx), a special register (RTC_IRQWAKEEN) is available to enable Alarm Wakeup feature. This register needs to be properly handled for the rtcwake to work properly. Platforms using such IP should set "ti,am3352-rtc" in rtc device dt compatibility node. Signed-off-by: Hebbar Gururaja <gururaja.hebbar@ti.com> Acked-by: Kevin Hilman <khilman@linaro.org> Acked-by: Sekhar Nori <nsekhar@ti.com> Cc: Grant Likely <grant.likely@linaro.org> Cc: Rob Herring <rob.herring@calxeda.com> Cc: Rob Landley <rob@landley.net> 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>hifive-unleashed-5.1
Hebbar Gururaja
Linus Torvalds
parent
453b4c6db5
commit
8af750e3f5
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@ -1,7 +1,11 @@
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TI Real Time Clock
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Required properties:
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- compatible: "ti,da830-rtc"
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- compatible:
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- "ti,da830-rtc" - for RTC IP used similar to that on DA8xx SoC family.
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- "ti,am3352-rtc" - for RTC IP used similar to that on AM335x SoC family.
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This RTC IP has special WAKE-EN Register to enable
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Wakeup generation for event Alarm.
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- reg: Address range of rtc register set
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- interrupts: rtc timer, alarm interrupts in order
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- interrupt-parent: phandle for the interrupt controller
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@ -70,6 +70,8 @@
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#define OMAP_RTC_KICK0_REG 0x6c
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#define OMAP_RTC_KICK1_REG 0x70
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#define OMAP_RTC_IRQWAKEEN 0x7c
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/* OMAP_RTC_CTRL_REG bit fields: */
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#define OMAP_RTC_CTRL_SPLIT (1<<7)
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#define OMAP_RTC_CTRL_DISABLE (1<<6)
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@ -94,12 +96,21 @@
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#define OMAP_RTC_INTERRUPTS_IT_ALARM (1<<3)
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#define OMAP_RTC_INTERRUPTS_IT_TIMER (1<<2)
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/* OMAP_RTC_IRQWAKEEN bit fields: */
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#define OMAP_RTC_IRQWAKEEN_ALARM_WAKEEN (1<<1)
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/* OMAP_RTC_KICKER values */
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#define KICK0_VALUE 0x83e70b13
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#define KICK1_VALUE 0x95a4f1e0
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#define OMAP_RTC_HAS_KICKER 0x1
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/*
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* Few RTC IP revisions has special WAKE-EN Register to enable Wakeup
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* generation for event Alarm.
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*/
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#define OMAP_RTC_HAS_IRQWAKEEN 0x2
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static void __iomem *rtc_base;
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#define rtc_read(addr) readb(rtc_base + (addr))
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@ -299,12 +310,18 @@ static struct rtc_class_ops omap_rtc_ops = {
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static int omap_rtc_alarm;
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static int omap_rtc_timer;
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#define OMAP_RTC_DATA_DA830_IDX 1
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#define OMAP_RTC_DATA_AM3352_IDX 1
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#define OMAP_RTC_DATA_DA830_IDX 2
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static struct platform_device_id omap_rtc_devtype[] = {
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{
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.name = DRIVER_NAME,
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}, {
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},
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[OMAP_RTC_DATA_AM3352_IDX] = {
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.name = "am3352-rtc",
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.driver_data = OMAP_RTC_HAS_KICKER | OMAP_RTC_HAS_IRQWAKEEN,
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},
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[OMAP_RTC_DATA_DA830_IDX] = {
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.name = "da830-rtc",
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.driver_data = OMAP_RTC_HAS_KICKER,
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},
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@ -316,6 +333,9 @@ static const struct of_device_id omap_rtc_of_match[] = {
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{ .compatible = "ti,da830-rtc",
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.data = &omap_rtc_devtype[OMAP_RTC_DATA_DA830_IDX],
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},
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{ .compatible = "ti,am3352-rtc",
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.data = &omap_rtc_devtype[OMAP_RTC_DATA_AM3352_IDX],
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},
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{},
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};
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MODULE_DEVICE_TABLE(of, omap_rtc_of_match);
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@ -464,16 +484,28 @@ static u8 irqstat;
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static int omap_rtc_suspend(struct device *dev)
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{
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u8 irqwake_stat;
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struct platform_device *pdev = to_platform_device(dev);
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const struct platform_device_id *id_entry =
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platform_get_device_id(pdev);
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irqstat = rtc_read(OMAP_RTC_INTERRUPTS_REG);
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/* FIXME the RTC alarm is not currently acting as a wakeup event
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* source, and in fact this enable() call is just saving a flag
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* that's never used...
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* source on some platforms, and in fact this enable() call is just
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* saving a flag that's never used...
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*/
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if (device_may_wakeup(dev))
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if (device_may_wakeup(dev)) {
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enable_irq_wake(omap_rtc_alarm);
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else
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if (id_entry->driver_data & OMAP_RTC_HAS_IRQWAKEEN) {
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irqwake_stat = rtc_read(OMAP_RTC_IRQWAKEEN);
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irqwake_stat |= OMAP_RTC_IRQWAKEEN_ALARM_WAKEEN;
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rtc_write(irqwake_stat, OMAP_RTC_IRQWAKEEN);
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}
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} else {
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rtc_write(0, OMAP_RTC_INTERRUPTS_REG);
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}
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/* Disable the clock/module */
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pm_runtime_put_sync(dev);
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@ -483,13 +515,25 @@ static int omap_rtc_suspend(struct device *dev)
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static int omap_rtc_resume(struct device *dev)
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{
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u8 irqwake_stat;
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struct platform_device *pdev = to_platform_device(dev);
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const struct platform_device_id *id_entry =
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platform_get_device_id(pdev);
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/* Enable the clock/module so that we can access the registers */
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pm_runtime_get_sync(dev);
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if (device_may_wakeup(dev))
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if (device_may_wakeup(dev)) {
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disable_irq_wake(omap_rtc_alarm);
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else
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if (id_entry->driver_data & OMAP_RTC_HAS_IRQWAKEEN) {
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irqwake_stat = rtc_read(OMAP_RTC_IRQWAKEEN);
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irqwake_stat &= ~OMAP_RTC_IRQWAKEEN_ALARM_WAKEEN;
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rtc_write(irqwake_stat, OMAP_RTC_IRQWAKEEN);
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}
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} else {
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rtc_write(irqstat, OMAP_RTC_INTERRUPTS_REG);
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}
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return 0;
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}
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#endif
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