[PATCH 2/3] rtc: s3c: support for exynosautov9 on-chip RTC

[Devang Tailor <dev.tailor@samsung.com>]

The on-chip RTC of this SoC is almost similar to the previous
versions of SoC. Hence re-use the existing driver with platform specific
change to enable RTC.

This has been tested with 'hwclock' & 'date' utilities

Signed-off-by: Devang Tailor <dev.tailor@samsung.com>
---
 drivers/rtc/rtc-s3c.c | 26 ++++++++++++++++++++++++++
 drivers/rtc/rtc-s3c.h |  4 ++++
 2 files changed, 30 insertions(+)

diff --git a/drivers/rtc/rtc-s3c.c b/drivers/rtc/rtc-s3c.c
index 5dd575865adf..00686aa805f2 100644
--- a/drivers/rtc/rtc-s3c.c
+++ b/drivers/rtc/rtc-s3c.c
@@ -384,6 +384,23 @@ static void s3c6410_rtc_disable(struct s3c_rtc *info)
 	writew(con, info->base + S3C2410_RTCCON);
 }
 
+static void exynosautov9_rtc_disable(struct s3c_rtc *info)
+{
+	unsigned int con;
+
+	con = readb(info->base + S3C2410_RTCCON);
+	con &= ~S3C2410_RTCCON_RTCEN;
+	writeb(con, info->base + S3C2410_RTCCON);
+
+	con = readb(info->base + EXYNOSAUTOV9_TICCON0);
+	con &= ~EXYNOSAUTOV9_TICCON_TICEN;
+	writeb(con, info->base + EXYNOSAUTOV9_TICCON0);
+
+	con = readb(info->base + EXYNOSAUTOV9_TICCON1);
+	con &= ~EXYNOSAUTOV9_TICCON_TICEN;
+	writeb(con, info->base + EXYNOSAUTOV9_TICCON1);
+}
+
 static void s3c_rtc_remove(struct platform_device *pdev)
 {
 	struct s3c_rtc *info = platform_get_drvdata(pdev);
@@ -574,6 +591,12 @@ static struct s3c_rtc_data const s3c6410_rtc_data = {
 	.disable		= s3c6410_rtc_disable,
 };
 
+static struct s3c_rtc_data const exynosautov9_rtc_data = {
+	.irq_handler		= s3c6410_rtc_irq,
+	.enable			= s3c24xx_rtc_enable,
+	.disable		= exynosautov9_rtc_disable,
+};
+
 static const __maybe_unused struct of_device_id s3c_rtc_dt_match[] = {
 	{
 		.compatible = "samsung,s3c2410-rtc",
@@ -590,6 +613,9 @@ static const __maybe_unused struct of_device_id s3c_rtc_dt_match[] = {
 	}, {
 		.compatible = "samsung,exynos3250-rtc",
 		.data = &s3c6410_rtc_data,
+	}, {
+		.compatible = "samsung,exynosautov9-rtc",
+		.data = &exynosautov9_rtc_data,
 	},
 	{ /* sentinel */ },
 };
diff --git a/drivers/rtc/rtc-s3c.h b/drivers/rtc/rtc-s3c.h
index 3552914aa611..ed57ebe06b41 100644
--- a/drivers/rtc/rtc-s3c.h
+++ b/drivers/rtc/rtc-s3c.h
@@ -14,6 +14,10 @@
 #define S3C2410_INTP_ALM	(1 << 1)
 #define S3C2410_INTP_TIC	(1 << 0)
 
+#define	EXYNOSAUTOV9_TICCON0	S3C2410_RTCREG(0x38)
+#define	EXYNOSAUTOV9_TICCON1	S3C2410_RTCREG(0x3C)
+#define	EXYNOSAUTOV9_TICCON_TICEN	(1 << 0)
+
 #define S3C2410_RTCCON		S3C2410_RTCREG(0x40)
 #define S3C2410_RTCCON_RTCEN	(1 << 0)
 #define S3C2410_RTCCON_CNTSEL	(1 << 2)
-- 
2.34.1