[Patch V2 3/4] rtc: omap: add rtc wakeup support to alarm events
Hebbar Gururaja
gururaja.hebbar at ti.com
Wed Jul 3 18:47:04 EST 2013
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 at ti.com>
Acked-by: Kevin Hilman <khilman at linaro.org>
Acked-by: Sekhar Nori <nsekhar at ti.com>
Cc: Grant Likely <grant.likely at linaro.org>
Cc: Rob Herring <rob.herring at calxeda.com>
Cc: Rob Landley <rob at landley.net>
Cc: Alessandro Zummo <a.zummo at towertech.it>
Cc: rtc-linux at googlegroups.com
Cc: devicetree-discuss at lists.ozlabs.org
Cc: linux-doc at vger.kernel.org
---
Changes in V2:
- Coding style corrections (use lower case for hex numbers)
- use "[AM/am]3352" instead of "[AM/am]335x" to keep the all
usages in sync.
- Use index defined for struct members so they remain in sync
:100644 100644 b47aa41... 5a0f02d... M Documentation/devicetree/bindings/rtc/rtc-omap.txt
:100644 100644 761919d... c2e18fe... M drivers/rtc/rtc-omap.c
Documentation/devicetree/bindings/rtc/rtc-omap.txt | 6 +-
drivers/rtc/rtc-omap.c | 60 +++++++++++++++++---
2 files changed, 57 insertions(+), 9 deletions(-)
diff --git a/Documentation/devicetree/bindings/rtc/rtc-omap.txt b/Documentation/devicetree/bindings/rtc/rtc-omap.txt
index b47aa41..5a0f02d 100644
--- a/Documentation/devicetree/bindings/rtc/rtc-omap.txt
+++ b/Documentation/devicetree/bindings/rtc/rtc-omap.txt
@@ -1,7 +1,11 @@
TI Real Time Clock
Required properties:
-- compatible: "ti,da830-rtc"
+- compatible:
+ - "ti,da830-rtc" - for RTC IP used similar to that on DA8xx SoC family.
+ - "ti,am3352-rtc" - for RTC IP used similar to that on AM335x SoC family.
+ This RTC IP has special WAKE-EN Register to enable
+ Wakeup generation for event Alarm.
- reg: Address range of rtc register set
- interrupts: rtc timer, alarm interrupts in order
- interrupt-parent: phandle for the interrupt controller
diff --git a/drivers/rtc/rtc-omap.c b/drivers/rtc/rtc-omap.c
index 761919d..c2e18fe 100644
--- a/drivers/rtc/rtc-omap.c
+++ b/drivers/rtc/rtc-omap.c
@@ -72,6 +72,8 @@
#define OMAP_RTC_KICK0_REG 0x6c
#define OMAP_RTC_KICK1_REG 0x70
+#define OMAP_RTC_IRQWAKEEN 0x7c
+
/* OMAP_RTC_CTRL_REG bit fields: */
#define OMAP_RTC_CTRL_SPLIT (1<<7)
#define OMAP_RTC_CTRL_DISABLE (1<<6)
@@ -96,12 +98,21 @@
#define OMAP_RTC_INTERRUPTS_IT_ALARM (1<<3)
#define OMAP_RTC_INTERRUPTS_IT_TIMER (1<<2)
+/* OMAP_RTC_IRQWAKEEN bit fields: */
+#define OMAP_RTC_IRQWAKEEN_ALARM_WAKEEN (1<<1)
+
/* OMAP_RTC_KICKER values */
#define KICK0_VALUE 0x83e70b13
#define KICK1_VALUE 0x95a4f1e0
#define OMAP_RTC_HAS_KICKER 0x1
+/*
+ * Few RTC IP revisions has special WAKE-EN Register to enable Wakeup
+ * generation for event Alarm.
+ */
+#define OMAP_RTC_HAS_IRQWAKEEN 0x2
+
static void __iomem *rtc_base;
#define rtc_read(addr) readb(rtc_base + (addr))
@@ -301,12 +312,18 @@ static struct rtc_class_ops omap_rtc_ops = {
static int omap_rtc_alarm;
static int omap_rtc_timer;
-#define OMAP_RTC_DATA_DA830_IDX 1
+#define OMAP_RTC_DATA_AM3352_IDX 1
+#define OMAP_RTC_DATA_DA830_IDX 2
static struct platform_device_id omap_rtc_devtype[] = {
{
.name = DRIVER_NAME,
- }, {
+ },
+ [OMAP_RTC_DATA_AM3352_IDX] = {
+ .name = "am3352-rtc",
+ .driver_data = OMAP_RTC_HAS_KICKER | OMAP_RTC_HAS_IRQWAKEEN,
+ },
+ [OMAP_RTC_DATA_DA830_IDX] = {
.name = "da830-rtc",
.driver_data = OMAP_RTC_HAS_KICKER,
},
@@ -318,6 +335,9 @@ static const struct of_device_id omap_rtc_of_match[] = {
{ .compatible = "ti,da830-rtc",
.data = &omap_rtc_devtype[OMAP_RTC_DATA_DA830_IDX],
},
+ { .compatible = "ti,am3352-rtc",
+ .data = &omap_rtc_devtype[OMAP_RTC_DATA_AM3352_IDX],
+ },
{},
};
MODULE_DEVICE_TABLE(of, omap_rtc_of_match);
@@ -466,16 +486,28 @@ static u8 irqstat;
static int omap_rtc_suspend(struct device *dev)
{
+ u8 irqwake_stat;
+ struct platform_device *pdev = to_platform_device(dev);
+ const struct platform_device_id *id_entry =
+ platform_get_device_id(pdev);
+
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...
+ * source on some platforms, and in fact this enable() call is just
+ * saving a flag that's never used...
*/
- if (device_may_wakeup(dev))
+ if (device_may_wakeup(dev)) {
enable_irq_wake(omap_rtc_alarm);
- else
+
+ if (id_entry->driver_data & OMAP_RTC_HAS_IRQWAKEEN) {
+ irqwake_stat = rtc_read(OMAP_RTC_IRQWAKEEN);
+ irqwake_stat |= OMAP_RTC_IRQWAKEEN_ALARM_WAKEEN;
+ rtc_write(irqwake_stat, OMAP_RTC_IRQWAKEEN);
+ }
+ } else {
rtc_write(0, OMAP_RTC_INTERRUPTS_REG);
+ }
/* Disable the clock/module */
pm_runtime_put_sync(dev);
@@ -485,13 +517,25 @@ static int omap_rtc_suspend(struct device *dev)
static int omap_rtc_resume(struct device *dev)
{
+ u8 irqwake_stat;
+ struct platform_device *pdev = to_platform_device(dev);
+ const struct platform_device_id *id_entry =
+ platform_get_device_id(pdev);
+
/* Enable the clock/module so that we can access the registers */
pm_runtime_get_sync(dev);
- if (device_may_wakeup(dev))
+ if (device_may_wakeup(dev)) {
disable_irq_wake(omap_rtc_alarm);
- else
+
+ if (id_entry->driver_data & OMAP_RTC_HAS_IRQWAKEEN) {
+ irqwake_stat = rtc_read(OMAP_RTC_IRQWAKEEN);
+ irqwake_stat &= ~OMAP_RTC_IRQWAKEEN_ALARM_WAKEEN;
+ rtc_write(irqwake_stat, OMAP_RTC_IRQWAKEEN);
+ }
+ } else {
rtc_write(irqstat, OMAP_RTC_INTERRUPTS_REG);
+ }
return 0;
}
#endif
--
1.7.9.5
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