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path: root/drivers/rtc/rtc-at91rm9200.c
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Diffstat (limited to 'drivers/rtc/rtc-at91rm9200.c')
-rw-r--r--drivers/rtc/rtc-at91rm9200.c100
1 files changed, 43 insertions, 57 deletions
diff --git a/drivers/rtc/rtc-at91rm9200.c b/drivers/rtc/rtc-at91rm9200.c
index 0a9f27e094e..0eab77b2234 100644
--- a/drivers/rtc/rtc-at91rm9200.c
+++ b/drivers/rtc/rtc-at91rm9200.c
@@ -28,6 +28,8 @@
#include <linux/ioctl.h>
#include <linux/completion.h>
#include <linux/io.h>
+#include <linux/of.h>
+#include <linux/of_device.h>
#include <asm/uaccess.h>
@@ -44,7 +46,6 @@ static DECLARE_COMPLETION(at91_rtc_updated);
static unsigned int at91_alarm_year = AT91_RTC_EPOCH;
static void __iomem *at91_rtc_regs;
static int irq;
-static u32 at91_rtc_imr;
/*
* Decode time/date into rtc_time structure
@@ -109,11 +110,9 @@ static int at91_rtc_settime(struct device *dev, struct rtc_time *tm)
cr = at91_rtc_read(AT91_RTC_CR);
at91_rtc_write(AT91_RTC_CR, cr | AT91_RTC_UPDCAL | AT91_RTC_UPDTIM);
- at91_rtc_imr |= AT91_RTC_ACKUPD;
at91_rtc_write(AT91_RTC_IER, AT91_RTC_ACKUPD);
wait_for_completion(&at91_rtc_updated); /* wait for ACKUPD interrupt */
at91_rtc_write(AT91_RTC_IDR, AT91_RTC_ACKUPD);
- at91_rtc_imr &= ~AT91_RTC_ACKUPD;
at91_rtc_write(AT91_RTC_TIMR,
bin2bcd(tm->tm_sec) << 0
@@ -145,7 +144,7 @@ static int at91_rtc_readalarm(struct device *dev, struct rtc_wkalrm *alrm)
tm->tm_yday = rtc_year_days(tm->tm_mday, tm->tm_mon, tm->tm_year);
tm->tm_year = at91_alarm_year - 1900;
- alrm->enabled = (at91_rtc_imr & AT91_RTC_ALARM)
+ alrm->enabled = (at91_rtc_read(AT91_RTC_IMR) & AT91_RTC_ALARM)
? 1 : 0;
dev_dbg(dev, "%s(): %4d-%02d-%02d %02d:%02d:%02d\n", __func__,
@@ -171,7 +170,6 @@ static int at91_rtc_setalarm(struct device *dev, struct rtc_wkalrm *alrm)
tm.tm_sec = alrm->time.tm_sec;
at91_rtc_write(AT91_RTC_IDR, AT91_RTC_ALARM);
- at91_rtc_imr &= ~AT91_RTC_ALARM;
at91_rtc_write(AT91_RTC_TIMALR,
bin2bcd(tm.tm_sec) << 0
| bin2bcd(tm.tm_min) << 8
@@ -184,7 +182,6 @@ static int at91_rtc_setalarm(struct device *dev, struct rtc_wkalrm *alrm)
if (alrm->enabled) {
at91_rtc_write(AT91_RTC_SCCR, AT91_RTC_ALARM);
- at91_rtc_imr |= AT91_RTC_ALARM;
at91_rtc_write(AT91_RTC_IER, AT91_RTC_ALARM);
}
@@ -201,12 +198,9 @@ static int at91_rtc_alarm_irq_enable(struct device *dev, unsigned int enabled)
if (enabled) {
at91_rtc_write(AT91_RTC_SCCR, AT91_RTC_ALARM);
- at91_rtc_imr |= AT91_RTC_ALARM;
at91_rtc_write(AT91_RTC_IER, AT91_RTC_ALARM);
- } else {
+ } else
at91_rtc_write(AT91_RTC_IDR, AT91_RTC_ALARM);
- at91_rtc_imr &= ~AT91_RTC_ALARM;
- }
return 0;
}
@@ -215,10 +209,12 @@ static int at91_rtc_alarm_irq_enable(struct device *dev, unsigned int enabled)
*/
static int at91_rtc_proc(struct device *dev, struct seq_file *seq)
{
+ unsigned long imr = at91_rtc_read(AT91_RTC_IMR);
+
seq_printf(seq, "update_IRQ\t: %s\n",
- (at91_rtc_imr & AT91_RTC_ACKUPD) ? "yes" : "no");
+ (imr & AT91_RTC_ACKUPD) ? "yes" : "no");
seq_printf(seq, "periodic_IRQ\t: %s\n",
- (at91_rtc_imr & AT91_RTC_SECEV) ? "yes" : "no");
+ (imr & AT91_RTC_SECEV) ? "yes" : "no");
return 0;
}
@@ -233,7 +229,7 @@ static irqreturn_t at91_rtc_interrupt(int irq, void *dev_id)
unsigned int rtsr;
unsigned long events = 0;
- rtsr = at91_rtc_read(AT91_RTC_SR) & at91_rtc_imr;
+ rtsr = at91_rtc_read(AT91_RTC_SR) & at91_rtc_read(AT91_RTC_IMR);
if (rtsr) { /* this interrupt is shared! Is it ours? */
if (rtsr & AT91_RTC_ALARM)
events |= (RTC_AF | RTC_IRQF);
@@ -297,14 +293,13 @@ static int __init at91_rtc_probe(struct platform_device *pdev)
at91_rtc_write(AT91_RTC_IDR, AT91_RTC_ACKUPD | AT91_RTC_ALARM |
AT91_RTC_SECEV | AT91_RTC_TIMEV |
AT91_RTC_CALEV);
- at91_rtc_imr = 0;
ret = request_irq(irq, at91_rtc_interrupt,
IRQF_SHARED,
"at91_rtc", pdev);
if (ret) {
dev_err(&pdev->dev, "IRQ %d already in use.\n", irq);
- return ret;
+ goto err_unmap;
}
/* cpu init code should really have flagged this device as
@@ -316,13 +311,20 @@ static int __init at91_rtc_probe(struct platform_device *pdev)
rtc = rtc_device_register(pdev->name, &pdev->dev,
&at91_rtc_ops, THIS_MODULE);
if (IS_ERR(rtc)) {
- free_irq(irq, pdev);
- return PTR_ERR(rtc);
+ ret = PTR_ERR(rtc);
+ goto err_free_irq;
}
platform_set_drvdata(pdev, rtc);
dev_info(&pdev->dev, "AT91 Real Time Clock driver.\n");
return 0;
+
+err_free_irq:
+ free_irq(irq, pdev);
+err_unmap:
+ iounmap(at91_rtc_regs);
+
+ return ret;
}
/*
@@ -336,84 +338,68 @@ static int __exit at91_rtc_remove(struct platform_device *pdev)
at91_rtc_write(AT91_RTC_IDR, AT91_RTC_ACKUPD | AT91_RTC_ALARM |
AT91_RTC_SECEV | AT91_RTC_TIMEV |
AT91_RTC_CALEV);
- at91_rtc_imr = 0;
free_irq(irq, pdev);
rtc_device_unregister(rtc);
+ iounmap(at91_rtc_regs);
platform_set_drvdata(pdev, NULL);
return 0;
}
-#ifdef CONFIG_PM
+#ifdef CONFIG_PM_SLEEP
/* AT91RM9200 RTC Power management control */
-static u32 at91_rtc_bkpimr;
-
+static u32 at91_rtc_imr;
static int at91_rtc_suspend(struct device *dev)
{
/* this IRQ is shared with DBGU and other hardware which isn't
* necessarily doing PM like we are...
*/
- at91_rtc_bkpimr = at91_rtc_imr & (AT91_RTC_ALARM|AT91_RTC_SECEV);
- if (at91_rtc_bkpimr) {
- if (device_may_wakeup(dev)) {
+ at91_rtc_imr = at91_rtc_read(AT91_RTC_IMR)
+ & (AT91_RTC_ALARM|AT91_RTC_SECEV);
+ if (at91_rtc_imr) {
+ if (device_may_wakeup(dev))
enable_irq_wake(irq);
- } else {
- at91_rtc_write(AT91_RTC_IDR, at91_rtc_bkpimr);
- at91_rtc_imr &= ~at91_rtc_bkpimr;
- }
-}
+ else
+ at91_rtc_write(AT91_RTC_IDR, at91_rtc_imr);
+ }
return 0;
}
static int at91_rtc_resume(struct device *dev)
{
- if (at91_rtc_bkpimr) {
- if (device_may_wakeup(dev)) {
+ if (at91_rtc_imr) {
+ if (device_may_wakeup(dev))
disable_irq_wake(irq);
- } else {
- at91_rtc_imr |= at91_rtc_bkpimr;
- at91_rtc_write(AT91_RTC_IER, at91_rtc_bkpimr);
- }
+ else
+ at91_rtc_write(AT91_RTC_IER, at91_rtc_imr);
}
return 0;
}
+#endif
-static const struct dev_pm_ops at91_rtc_pm = {
- .suspend = at91_rtc_suspend,
- .resume = at91_rtc_resume,
-};
-
-#define at91_rtc_pm_ptr &at91_rtc_pm
+static SIMPLE_DEV_PM_OPS(at91_rtc_pm_ops, at91_rtc_suspend, at91_rtc_resume);
-#else
-#define at91_rtc_pm_ptr NULL
-#endif
+static const struct of_device_id at91_rtc_dt_ids[] = {
+ { .compatible = "atmel,at91rm9200-rtc" },
+ { /* sentinel */ }
+};
+MODULE_DEVICE_TABLE(of, at91_rtc_dt_ids);
static struct platform_driver at91_rtc_driver = {
.remove = __exit_p(at91_rtc_remove),
.driver = {
.name = "at91_rtc",
.owner = THIS_MODULE,
- .pm = at91_rtc_pm_ptr,
+ .pm = &at91_rtc_pm_ops,
+ .of_match_table = of_match_ptr(at91_rtc_dt_ids),
},
};
-static int __init at91_rtc_init(void)
-{
- return platform_driver_probe(&at91_rtc_driver, at91_rtc_probe);
-}
-
-static void __exit at91_rtc_exit(void)
-{
- platform_driver_unregister(&at91_rtc_driver);
-}
-
-module_init(at91_rtc_init);
-module_exit(at91_rtc_exit);
+module_platform_driver_probe(at91_rtc_driver, at91_rtc_probe);
MODULE_AUTHOR("Rick Bronson");
MODULE_DESCRIPTION("RTC driver for Atmel AT91RM9200");
generated by cgit v1.2.3-70-g09d2 (git 2.51.2) at 2025-11-04 12:35:16 +0000