aboutsummaryrefslogtreecommitdiff
path: root/drivers/rtc
diff options
context:
space:
mode:
Diffstat (limited to 'drivers/rtc')
-rw-r--r--drivers/rtc/Kconfig9
-rw-r--r--drivers/rtc/rtc-s3c.c44
2 files changed, 50 insertions, 3 deletions
diff --git a/drivers/rtc/Kconfig b/drivers/rtc/Kconfig
index 06cb8d6823a..48ca7132cc0 100644
--- a/drivers/rtc/Kconfig
+++ b/drivers/rtc/Kconfig
@@ -674,9 +674,16 @@ config RTC_DRV_OMAP
DA8xx/OMAP-L13x chips. This driver can also be built as a
module called rtc-omap.
+config HAVE_S3C_RTC
+ bool
+ help
+ This will include RTC support for Samsung SoCs. If
+ you want to include RTC support for any machine, kindly
+ select this in the respective mach-XXXX/Kconfig file.
+
config RTC_DRV_S3C
tristate "Samsung S3C series SoC RTC"
- depends on ARCH_S3C2410 || ARCH_S3C64XX
+ depends on ARCH_S3C2410 || ARCH_S3C64XX || HAVE_S3C_RTC
help
RTC (Realtime Clock) driver for the clock inbuilt into the
Samsung S3C24XX series of SoCs. This can provide periodic
diff --git a/drivers/rtc/rtc-s3c.c b/drivers/rtc/rtc-s3c.c
index 70b68d35f96..a0d3ec89d41 100644
--- a/drivers/rtc/rtc-s3c.c
+++ b/drivers/rtc/rtc-s3c.c
@@ -1,5 +1,8 @@
/* drivers/rtc/rtc-s3c.c
*
+ * Copyright (c) 2010 Samsung Electronics Co., Ltd.
+ * http://www.samsung.com/
+ *
* Copyright (c) 2004,2006 Simtec Electronics
* Ben Dooks, <ben@simtec.co.uk>
* http://armlinux.simtec.co.uk/
@@ -39,6 +42,7 @@ enum s3c_cpu_type {
static struct resource *s3c_rtc_mem;
+static struct clk *rtc_clk;
static void __iomem *s3c_rtc_base;
static int s3c_rtc_alarmno = NO_IRQ;
static int s3c_rtc_tickno = NO_IRQ;
@@ -53,6 +57,10 @@ static irqreturn_t s3c_rtc_alarmirq(int irq, void *id)
struct rtc_device *rdev = id;
rtc_update_irq(rdev, 1, RTC_AF | RTC_IRQF);
+
+ if (s3c_rtc_cpu_type == TYPE_S3C64XX)
+ writeb(S3C2410_INTP_ALM, s3c_rtc_base + S3C2410_INTP);
+
return IRQ_HANDLED;
}
@@ -61,6 +69,10 @@ static irqreturn_t s3c_rtc_tickirq(int irq, void *id)
struct rtc_device *rdev = id;
rtc_update_irq(rdev, 1, RTC_PF | RTC_IRQF);
+
+ if (s3c_rtc_cpu_type == TYPE_S3C64XX)
+ writeb(S3C2410_INTP_TIC, s3c_rtc_base + S3C2410_INTP);
+
return IRQ_HANDLED;
}
@@ -94,7 +106,7 @@ static int s3c_rtc_setpie(struct device *dev, int enabled)
if (enabled)
tmp |= S3C64XX_RTCCON_TICEN;
- writeb(tmp, s3c_rtc_base + S3C2410_RTCCON);
+ writew(tmp, s3c_rtc_base + S3C2410_RTCCON);
} else {
tmp = readb(s3c_rtc_base + S3C2410_TICNT);
tmp &= ~S3C2410_TICNT_ENABLE;
@@ -128,7 +140,7 @@ static int s3c_rtc_setfreq(struct device *dev, int freq)
tmp |= (rtc_dev->max_user_freq / freq)-1;
- writeb(tmp, s3c_rtc_base + S3C2410_TICNT);
+ writel(tmp, s3c_rtc_base + S3C2410_TICNT);
spin_unlock_irq(&s3c_rtc_pie_lock);
return 0;
@@ -431,6 +443,10 @@ static int __devexit s3c_rtc_remove(struct platform_device *dev)
s3c_rtc_setpie(&dev->dev, 0);
s3c_rtc_setaie(0);
+ clk_disable(rtc_clk);
+ clk_put(rtc_clk);
+ rtc_clk = NULL;
+
iounmap(s3c_rtc_base);
release_resource(s3c_rtc_mem);
kfree(s3c_rtc_mem);
@@ -442,6 +458,7 @@ static int __devinit s3c_rtc_probe(struct platform_device *pdev)
{
struct rtc_device *rtc;
struct resource *res;
+ unsigned int tmp, i;
int ret;
pr_debug("%s: probe=%p\n", __func__, pdev);
@@ -488,6 +505,16 @@ static int __devinit s3c_rtc_probe(struct platform_device *pdev)
goto err_nomap;
}
+ rtc_clk = clk_get(&pdev->dev, "rtc");
+ if (IS_ERR(rtc_clk)) {
+ dev_err(&pdev->dev, "failed to find rtc clock source\n");
+ ret = PTR_ERR(rtc_clk);
+ rtc_clk = NULL;
+ goto err_clk;
+ }
+
+ clk_enable(rtc_clk);
+
/* check to see if everything is setup correctly */
s3c_rtc_enable(pdev, 1);
@@ -510,6 +537,15 @@ static int __devinit s3c_rtc_probe(struct platform_device *pdev)
s3c_rtc_cpu_type = platform_get_device_id(pdev)->driver_data;
+ /* Check RTC Time */
+
+ for (i = S3C2410_RTCSEC; i <= S3C2410_RTCYEAR; i += 0x4) {
+ tmp = readb(s3c_rtc_base + i);
+
+ if ((tmp & 0xf) > 0x9 || ((tmp >> 4) & 0xf) > 0x9)
+ writeb(0, s3c_rtc_base + i);
+ }
+
if (s3c_rtc_cpu_type == TYPE_S3C64XX)
rtc->max_user_freq = 32768;
else
@@ -523,6 +559,10 @@ static int __devinit s3c_rtc_probe(struct platform_device *pdev)
err_nortc:
s3c_rtc_enable(pdev, 0);
+ clk_disable(rtc_clk);
+ clk_put(rtc_clk);
+
+ err_clk:
iounmap(s3c_rtc_base);
err_nomap: