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path: root/drivers/rtc/rtc-omap.c
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Diffstat (limited to 'drivers/rtc/rtc-omap.c')
-rw-r--r--drivers/rtc/rtc-omap.c136
1 files changed, 99 insertions, 37 deletions
diff --git a/drivers/rtc/rtc-omap.c b/drivers/rtc/rtc-omap.c
index b0ba3fc991e..21142e6574a 100644
--- a/drivers/rtc/rtc-omap.c
+++ b/drivers/rtc/rtc-omap.c
@@ -23,9 +23,7 @@
#include <linux/of.h>
#include <linux/of_device.h>
#include <linux/pm_runtime.h>
-
-#include <asm/io.h>
-
+#include <linux/io.h>
/* The OMAP1 RTC is a year/month/day/hours/minutes/seconds BCD clock
* with century-range alarm matching, driven by the 32kHz clock.
@@ -72,35 +70,55 @@
#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)
-#define OMAP_RTC_CTRL_SET_32_COUNTER (1<<5)
-#define OMAP_RTC_CTRL_TEST (1<<4)
-#define OMAP_RTC_CTRL_MODE_12_24 (1<<3)
-#define OMAP_RTC_CTRL_AUTO_COMP (1<<2)
-#define OMAP_RTC_CTRL_ROUND_30S (1<<1)
-#define OMAP_RTC_CTRL_STOP (1<<0)
+#define OMAP_RTC_CTRL_SPLIT BIT(7)
+#define OMAP_RTC_CTRL_DISABLE BIT(6)
+#define OMAP_RTC_CTRL_SET_32_COUNTER BIT(5)
+#define OMAP_RTC_CTRL_TEST BIT(4)
+#define OMAP_RTC_CTRL_MODE_12_24 BIT(3)
+#define OMAP_RTC_CTRL_AUTO_COMP BIT(2)
+#define OMAP_RTC_CTRL_ROUND_30S BIT(1)
+#define OMAP_RTC_CTRL_STOP BIT(0)
/* OMAP_RTC_STATUS_REG bit fields: */
-#define OMAP_RTC_STATUS_POWER_UP (1<<7)
-#define OMAP_RTC_STATUS_ALARM (1<<6)
-#define OMAP_RTC_STATUS_1D_EVENT (1<<5)
-#define OMAP_RTC_STATUS_1H_EVENT (1<<4)
-#define OMAP_RTC_STATUS_1M_EVENT (1<<3)
-#define OMAP_RTC_STATUS_1S_EVENT (1<<2)
-#define OMAP_RTC_STATUS_RUN (1<<1)
-#define OMAP_RTC_STATUS_BUSY (1<<0)
+#define OMAP_RTC_STATUS_POWER_UP 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)
+#define OMAP_RTC_STATUS_1M_EVENT BIT(3)
+#define OMAP_RTC_STATUS_1S_EVENT BIT(2)
+#define OMAP_RTC_STATUS_RUN BIT(1)
+#define OMAP_RTC_STATUS_BUSY BIT(0)
/* OMAP_RTC_INTERRUPTS_REG bit fields: */
-#define OMAP_RTC_INTERRUPTS_IT_ALARM (1<<3)
-#define OMAP_RTC_INTERRUPTS_IT_TIMER (1<<2)
+#define OMAP_RTC_INTERRUPTS_IT_ALARM BIT(3)
+#define OMAP_RTC_INTERRUPTS_IT_TIMER BIT(2)
+
+/* OMAP_RTC_OSC_REG bit fields: */
+#define OMAP_RTC_OSC_32KCLK_EN BIT(6)
+
+/* OMAP_RTC_IRQWAKEEN bit fields: */
+#define OMAP_RTC_IRQWAKEEN_ALARM_WAKEEN BIT(1)
/* OMAP_RTC_KICKER values */
#define KICK0_VALUE 0x83e70b13
#define KICK1_VALUE 0x95a4f1e0
-#define OMAP_RTC_HAS_KICKER 0x1
+#define OMAP_RTC_HAS_KICKER BIT(0)
+
+/*
+ * Few RTC IP revisions has special WAKE-EN Register to enable Wakeup
+ * generation for event Alarm.
+ */
+#define OMAP_RTC_HAS_IRQWAKEEN BIT(1)
+
+/*
+ * Some RTC IP revisions (like those in AM335x and DRA7x) need
+ * the 32KHz clock to be explicitly enabled.
+ */
+#define OMAP_RTC_HAS_32KCLK_EN BIT(2)
static void __iomem *rtc_base;
@@ -153,17 +171,28 @@ static irqreturn_t rtc_irq(int irq, void *rtc)
static int omap_rtc_alarm_irq_enable(struct device *dev, unsigned int enabled)
{
- u8 reg;
+ u8 reg, irqwake_reg = 0;
+ struct platform_device *pdev = to_platform_device(dev);
+ const struct platform_device_id *id_entry =
+ platform_get_device_id(pdev);
local_irq_disable();
rtc_wait_not_busy();
reg = rtc_read(OMAP_RTC_INTERRUPTS_REG);
- if (enabled)
+ if (id_entry->driver_data & OMAP_RTC_HAS_IRQWAKEEN)
+ irqwake_reg = rtc_read(OMAP_RTC_IRQWAKEEN);
+
+ if (enabled) {
reg |= OMAP_RTC_INTERRUPTS_IT_ALARM;
- else
+ irqwake_reg |= OMAP_RTC_IRQWAKEEN_ALARM_WAKEEN;
+ } else {
reg &= ~OMAP_RTC_INTERRUPTS_IT_ALARM;
+ irqwake_reg &= ~OMAP_RTC_IRQWAKEEN_ALARM_WAKEEN;
+ }
rtc_wait_not_busy();
rtc_write(reg, OMAP_RTC_INTERRUPTS_REG);
+ if (id_entry->driver_data & OMAP_RTC_HAS_IRQWAKEEN)
+ rtc_write(irqwake_reg, OMAP_RTC_IRQWAKEEN);
local_irq_enable();
return 0;
@@ -263,7 +292,10 @@ static int omap_rtc_read_alarm(struct device *dev, struct rtc_wkalrm *alm)
static int omap_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *alm)
{
- u8 reg;
+ u8 reg, irqwake_reg = 0;
+ struct platform_device *pdev = to_platform_device(dev);
+ const struct platform_device_id *id_entry =
+ platform_get_device_id(pdev);
if (tm2bcd(&alm->time) < 0)
return -EINVAL;
@@ -279,11 +311,19 @@ static int omap_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *alm)
rtc_write(alm->time.tm_sec, OMAP_RTC_ALARM_SECONDS_REG);
reg = rtc_read(OMAP_RTC_INTERRUPTS_REG);
- if (alm->enabled)
+ if (id_entry->driver_data & OMAP_RTC_HAS_IRQWAKEEN)
+ irqwake_reg = rtc_read(OMAP_RTC_IRQWAKEEN);
+
+ if (alm->enabled) {
reg |= OMAP_RTC_INTERRUPTS_IT_ALARM;
- else
+ irqwake_reg |= OMAP_RTC_IRQWAKEEN_ALARM_WAKEEN;
+ } else {
reg &= ~OMAP_RTC_INTERRUPTS_IT_ALARM;
+ irqwake_reg &= ~OMAP_RTC_IRQWAKEEN_ALARM_WAKEEN;
+ }
rtc_write(reg, OMAP_RTC_INTERRUPTS_REG);
+ if (id_entry->driver_data & OMAP_RTC_HAS_IRQWAKEEN)
+ rtc_write(irqwake_reg, OMAP_RTC_IRQWAKEEN);
local_irq_enable();
@@ -301,12 +341,19 @@ 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_HAS_32KCLK_EN,
+ },
+ [OMAP_RTC_DATA_DA830_IDX] = {
.name = "da830-rtc",
.driver_data = OMAP_RTC_HAS_KICKER,
},
@@ -318,6 +365,9 @@ 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);
@@ -334,6 +384,12 @@ static int __init omap_rtc_probe(struct platform_device *pdev)
if (of_id)
pdev->id_entry = of_id->data;
+ id_entry = platform_get_device_id(pdev);
+ if (!id_entry) {
+ dev_err(&pdev->dev, "no matching device entry\n");
+ return -ENODEV;
+ }
+
omap_rtc_timer = platform_get_irq(pdev, 0);
if (omap_rtc_timer <= 0) {
pr_debug("%s: no update irq?\n", pdev->name);
@@ -355,8 +411,7 @@ static int __init omap_rtc_probe(struct platform_device *pdev)
pm_runtime_enable(&pdev->dev);
pm_runtime_get_sync(&pdev->dev);
- id_entry = platform_get_device_id(pdev);
- if (id_entry && (id_entry->driver_data & OMAP_RTC_HAS_KICKER)) {
+ if (id_entry->driver_data & OMAP_RTC_HAS_KICKER) {
rtc_writel(KICK0_VALUE, OMAP_RTC_KICK0_REG);
rtc_writel(KICK1_VALUE, OMAP_RTC_KICK1_REG);
}
@@ -375,6 +430,10 @@ static int __init omap_rtc_probe(struct platform_device *pdev)
*/
rtc_write(0, OMAP_RTC_INTERRUPTS_REG);
+ /* enable RTC functional clock */
+ if (id_entry->driver_data & OMAP_RTC_HAS_32KCLK_EN)
+ rtc_writel(OMAP_RTC_OSC_32KCLK_EN, OMAP_RTC_OSC_REG);
+
/* clear old status */
reg = rtc_read(OMAP_RTC_STATUS_REG);
if (reg & (u8) OMAP_RTC_STATUS_POWER_UP) {
@@ -423,6 +482,8 @@ static int __init omap_rtc_probe(struct platform_device *pdev)
* is write-only, and always reads as zero...)
*/
+ device_init_wakeup(&pdev->dev, true);
+
if (new_ctrl & (u8) OMAP_RTC_CTRL_SPLIT)
pr_info("%s: split power mode\n", pdev->name);
@@ -432,7 +493,7 @@ static int __init omap_rtc_probe(struct platform_device *pdev)
return 0;
fail0:
- if (id_entry && (id_entry->driver_data & OMAP_RTC_HAS_KICKER))
+ if (id_entry->driver_data & OMAP_RTC_HAS_KICKER)
rtc_writel(0, OMAP_RTC_KICK0_REG);
pm_runtime_put_sync(&pdev->dev);
pm_runtime_disable(&pdev->dev);
@@ -449,7 +510,7 @@ static int __exit omap_rtc_remove(struct platform_device *pdev)
/* leave rtc running, but disable irqs */
rtc_write(0, OMAP_RTC_INTERRUPTS_REG);
- if (id_entry && (id_entry->driver_data & OMAP_RTC_HAS_KICKER))
+ if (id_entry->driver_data & OMAP_RTC_HAS_KICKER)
rtc_writel(0, OMAP_RTC_KICK0_REG);
/* Disable the clock/module */
@@ -467,8 +528,8 @@ static int omap_rtc_suspend(struct device *dev)
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))
enable_irq_wake(omap_rtc_alarm);
@@ -490,6 +551,7 @@ static int omap_rtc_resume(struct device *dev)
disable_irq_wake(omap_rtc_alarm);
else
rtc_write(irqstat, OMAP_RTC_INTERRUPTS_REG);
+
return 0;
}
#endif
@@ -509,7 +571,7 @@ static struct platform_driver omap_rtc_driver = {
.name = DRIVER_NAME,
.owner = THIS_MODULE,
.pm = &omap_rtc_pm_ops,
- .of_match_table = of_match_ptr(omap_rtc_of_match),
+ .of_match_table = omap_rtc_of_match,
},
.id_table = omap_rtc_devtype,
};
generated by cgit v1.2.3-70-g09d2 (git 2.46.0) at 2025-11-09 16:10:36 +0000