diff --git a/Documentation/devicetree/bindings/rtc/rtc-omap.txt b/Documentation/devicetree/bindings/rtc/rtc-omap.txt
index 5a0f02d34d9578a549fbf8ff05474a2abd96b9f3..750efd40c72e5f1bc0e5d52d5e2178e7c6a31138 100644
--- a/Documentation/devicetree/bindings/rtc/rtc-omap.txt
+++ b/Documentation/devicetree/bindings/rtc/rtc-omap.txt
@@ -5,11 +5,17 @@ Required properties:
- "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.
+ Wakeup generation for event Alarm. It can also be
+ used to control an external PMIC via the
+ pmic_power_en pin.
- reg: Address range of rtc register set
- interrupts: rtc timer, alarm interrupts in order
- interrupt-parent: phandle for the interrupt controller
+Optional properties:
+- ti,system-power-controller: whether the rtc is controlling the system power
+ through pmic_power_en
+
Example:
rtc@1c23000 {
@@ -18,4 +24,5 @@ rtc@1c23000 {
interrupts = <19
19>;
interrupt-parent = <&intc>;
+ ti,system-power-controller;
};
diff --git a/drivers/rtc/rtc-omap.c b/drivers/rtc/rtc-omap.c
index c508e45ca3ce798e3c321d78814b5f20b18f73c0..e83f51ae7f63168c0e91c4a8097b8ab1af5f2747 100644
--- a/drivers/rtc/rtc-omap.c
+++ b/drivers/rtc/rtc-omap.c
@@ -68,6 +68,15 @@
#define OMAP_RTC_IRQWAKEEN 0x7c
+#define OMAP_RTC_ALARM2_SECONDS_REG 0x80
+#define OMAP_RTC_ALARM2_MINUTES_REG 0x84
+#define OMAP_RTC_ALARM2_HOURS_REG 0x88
+#define OMAP_RTC_ALARM2_DAYS_REG 0x8c
+#define OMAP_RTC_ALARM2_MONTHS_REG 0x90
+#define OMAP_RTC_ALARM2_YEARS_REG 0x94
+
+#define OMAP_RTC_PMIC_REG 0x98
+
/* OMAP_RTC_CTRL_REG bit fields: */
#define OMAP_RTC_CTRL_SPLIT BIT(7)
#define OMAP_RTC_CTRL_DISABLE BIT(6)
@@ -80,6 +89,7 @@
/* OMAP_RTC_STATUS_REG bit fields: */
#define OMAP_RTC_STATUS_POWER_UP BIT(7)
+#define OMAP_RTC_STATUS_ALARM2 BIT(7)
#define OMAP_RTC_STATUS_ALARM BIT(6)
#define OMAP_RTC_STATUS_1D_EVENT BIT(5)
#define OMAP_RTC_STATUS_1H_EVENT BIT(4)
@@ -89,6 +99,7 @@
#define OMAP_RTC_STATUS_BUSY BIT(0)
/* OMAP_RTC_INTERRUPTS_REG bit fields: */
+#define OMAP_RTC_INTERRUPTS_IT_ALARM2 BIT(4)
#define OMAP_RTC_INTERRUPTS_IT_ALARM BIT(3)
#define OMAP_RTC_INTERRUPTS_IT_TIMER BIT(2)
@@ -98,6 +109,9 @@
/* OMAP_RTC_IRQWAKEEN bit fields: */
#define OMAP_RTC_IRQWAKEEN_ALARM_WAKEEN BIT(1)
+/* OMAP_RTC_PMIC bit fields: */
+#define OMAP_RTC_PMIC_POWER_EN_EN BIT(16)
+
/* OMAP_RTC_KICKER values */
#define KICK0_VALUE 0x83e70b13
#define KICK1_VALUE 0x95a4f1e0
@@ -106,6 +120,7 @@ struct omap_rtc_device_type {
bool has_32kclk_en;
bool has_kicker;
bool has_irqwakeen;
+ bool has_pmic_mode;
bool has_power_up_reset;
};
@@ -115,6 +130,7 @@ struct omap_rtc {
int irq_alarm;
int irq_timer;
u8 interrupts_reg;
+ bool is_pmic_controller;
const struct omap_rtc_device_type *type;
};
@@ -345,6 +361,70 @@ static int omap_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *alm)
return 0;
}
+static struct omap_rtc *omap_rtc_power_off_rtc;
+
+/*
+ * omap_rtc_poweroff: RTC-controlled power off
+ *
+ * The RTC can be used to control an external PMIC via the pmic_power_en pin,
+ * which can be configured to transition to OFF on ALARM2 events.
+ *
+ * Notes:
+ * The two-second alarm offset is the shortest offset possible as the alarm
+ * registers must be set before the next timer update and the offset
+ * calculation is too heavy for everything to be done within a single access
+ * period (~15 us).
+ *
+ * Called with local interrupts disabled.
+ */
+static void omap_rtc_power_off(void)
+{
+ struct omap_rtc *rtc = omap_rtc_power_off_rtc;
+ struct rtc_time tm;
+ unsigned long now;
+ u32 val;
+
+ /* enable pmic_power_en control */
+ val = rtc_readl(rtc, OMAP_RTC_PMIC_REG);
+ rtc_writel(rtc, OMAP_RTC_PMIC_REG, val | OMAP_RTC_PMIC_POWER_EN_EN);
+
+ /* set alarm two seconds from now */
+ omap_rtc_read_time_raw(rtc, &tm);
+ bcd2tm(&tm);
+ rtc_tm_to_time(&tm, &now);
+ rtc_time_to_tm(now + 2, &tm);
+
+ if (tm2bcd(&tm) < 0) {
+ dev_err(&rtc->rtc->dev, "power off failed\n");
+ return;
+ }
+
+ rtc_wait_not_busy(rtc);
+
+ rtc_write(rtc, OMAP_RTC_ALARM2_SECONDS_REG, tm.tm_sec);
+ rtc_write(rtc, OMAP_RTC_ALARM2_MINUTES_REG, tm.tm_min);
+ rtc_write(rtc, OMAP_RTC_ALARM2_HOURS_REG, tm.tm_hour);
+ rtc_write(rtc, OMAP_RTC_ALARM2_DAYS_REG, tm.tm_mday);
+ rtc_write(rtc, OMAP_RTC_ALARM2_MONTHS_REG, tm.tm_mon);
+ rtc_write(rtc, OMAP_RTC_ALARM2_YEARS_REG, tm.tm_year);
+
+ /*
+ * enable ALARM2 interrupt
+ *
+ * NOTE: this fails on AM3352 if rtc_write (writeb) is used
+ */
+ val = rtc_read(rtc, OMAP_RTC_INTERRUPTS_REG);
+ rtc_writel(rtc, OMAP_RTC_INTERRUPTS_REG,
+ val | OMAP_RTC_INTERRUPTS_IT_ALARM2);
+
+ /*
+ * Wait for alarm to trigger (within two seconds) and external PMIC to
+ * power off the system. Add a 500 ms margin for external latencies
+ * (e.g. debounce circuits).
+ */
+ mdelay(2500);
+}
+
static struct rtc_class_ops omap_rtc_ops = {
.read_time = omap_rtc_read_time,
.set_time = omap_rtc_set_time,
@@ -361,6 +441,7 @@ static const struct omap_rtc_device_type omap_rtc_am3352_type = {
.has_32kclk_en = true,
.has_kicker = true,
.has_irqwakeen = true,
+ .has_pmic_mode = true,
};
static const struct omap_rtc_device_type omap_rtc_da830_type = {
@@ -412,6 +493,9 @@ static int __init omap_rtc_probe(struct platform_device *pdev)
of_id = of_match_device(omap_rtc_of_match, &pdev->dev);
if (of_id) {
rtc->type = of_id->data;
+ rtc->is_pmic_controller = rtc->type->has_pmic_mode &&
+ of_property_read_bool(pdev->dev.of_node,
+ "ti,system-power-controller");
} else {
id_entry = platform_get_device_id(pdev);
rtc->type = (void *)id_entry->driver_data;
@@ -460,6 +544,9 @@ static int __init omap_rtc_probe(struct platform_device *pdev)
mask = OMAP_RTC_STATUS_ALARM;
+ if (rtc->type->has_pmic_mode)
+ mask |= OMAP_RTC_STATUS_ALARM2;
+
if (rtc->type->has_power_up_reset) {
mask |= OMAP_RTC_STATUS_POWER_UP;
if (reg & OMAP_RTC_STATUS_POWER_UP)
@@ -520,6 +607,13 @@ static int __init omap_rtc_probe(struct platform_device *pdev)
goto err;
}
+ if (rtc->is_pmic_controller) {
+ if (!pm_power_off) {
+ omap_rtc_power_off_rtc = rtc;
+ pm_power_off = omap_rtc_power_off;
+ }
+ }
+
return 0;
err:
@@ -536,6 +630,12 @@ static int __exit omap_rtc_remove(struct platform_device *pdev)
{
struct omap_rtc *rtc = platform_get_drvdata(pdev);
+ if (pm_power_off == omap_rtc_power_off &&
+ omap_rtc_power_off_rtc == rtc) {
+ pm_power_off = NULL;
+ omap_rtc_power_off_rtc = NULL;
+ }
+
device_init_wakeup(&pdev->dev, 0);
/* leave rtc running, but disable irqs */