[PATCH 5/8] rtc: rtc-s3c: Add RTC support for Samsung S3C64XX

Kukjin Kim kgene.kim at samsung.com
Tue May 18 01:59:29 EDT 2010


From: Taekgyun Ko <taeggyun.ko at samsung.com>

This patch adds support for Samsung S3C64XX.

Signed-off-by: Taekgyun Ko <taeggyun.ko at samsung.com>
Signed-off-by: Sangbeom Kim <sbkim73 at samsung.com>
Signed-off-by: Kukjin Kim <kgene.kim at samsung.com>
---
 drivers/rtc/rtc-s3c.c |  153 +++++++++++++++++++++++++++++++++++++++++-------
 1 files changed, 130 insertions(+), 23 deletions(-)

diff --git a/drivers/rtc/rtc-s3c.c b/drivers/rtc/rtc-s3c.c
index 9364dc2..77f33df 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 at simtec.co.uk>
  *	http://armlinux.simtec.co.uk/
@@ -8,7 +11,7 @@
  * it under the terms of the GNU General Public License version 2 as
  * published by the Free Software Foundation.
  *
- * S3C2410/S3C2440/S3C24XX Internal RTC Driver
+ * S3C2410/S3C2440/S3C24XX/S3C64XX Internal RTC Driver
 */
 
 #include <linux/module.h>
@@ -28,16 +31,24 @@
 #include <asm/io.h>
 #include <asm/irq.h>
 #include <plat/regs-rtc.h>
+#include <plat/clock.h>
 
 /* I have yet to find an S3C implementation with more than one
  * of these rtc blocks in */
 
+enum s3c_cpu_type {
+	TYPE_S3C2410,
+	TYPE_S3C64XX,
+};
+
 static struct resource *s3c_rtc_mem;
 
 static void __iomem *s3c_rtc_base;
 static int s3c_rtc_alarmno = NO_IRQ;
 static int s3c_rtc_tickno  = NO_IRQ;
 
+static enum s3c_cpu_type s3c_rtc_cpu_type;
+
 static DEFINE_SPINLOCK(s3c_rtc_pie_lock);
 
 /* IRQ Handlers */
@@ -47,6 +58,10 @@ 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(S3C64XX_INTP_ALM, s3c_rtc_base + S3C64XX_INTP);
+
 	return IRQ_HANDLED;
 }
 
@@ -55,6 +70,10 @@ 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(S3C64XX_INTP_TIC, s3c_rtc_base + S3C64XX_INTP);
+
 	return IRQ_HANDLED;
 }
 
@@ -82,12 +101,25 @@ static int s3c_rtc_setpie(struct device *dev, int enabled)
 	pr_debug("%s: pie=%d\n", __func__, enabled);
 
 	spin_lock_irq(&s3c_rtc_pie_lock);
-	tmp = readb(s3c_rtc_base + S3C2410_TICNT) & ~S3C2410_TICNT_ENABLE;
 
-	if (enabled)
-		tmp |= S3C2410_TICNT_ENABLE;
+	if (s3c_rtc_cpu_type == TYPE_S3C64XX) {
+		tmp = readw(s3c_rtc_base + S3C2410_RTCCON);
+		tmp &= ~S3C64XX_RTCCON_TICEN;
+
+		if (enabled)
+			tmp |= S3C64XX_RTCCON_TICEN;
+
+		writew(tmp, s3c_rtc_base + S3C2410_RTCCON);
+	} else {
+		tmp = readb(s3c_rtc_base + S3C2410_TICNT);
+		tmp &= ~S3C2410_TICNT_ENABLE;
+
+		if (enabled)
+			tmp |= S3C2410_TICNT_ENABLE;
+
+		writeb(tmp, s3c_rtc_base + S3C2410_TICNT);
+	}
 
-	writeb(tmp, s3c_rtc_base + S3C2410_TICNT);
 	spin_unlock_irq(&s3c_rtc_pie_lock);
 
 	return 0;
@@ -102,10 +134,16 @@ static int s3c_rtc_setfreq(struct device *dev, int freq)
 
 	spin_lock_irq(&s3c_rtc_pie_lock);
 
-	tmp = readb(s3c_rtc_base + S3C2410_TICNT) & S3C2410_TICNT_ENABLE;
-	tmp |= (128 / freq)-1;
+	if (s3c_rtc_cpu_type == TYPE_S3C64XX) {
+		tmp = (32768 / freq) - 1;
+		writel(tmp, s3c_rtc_base + S3C2410_TICNT);
+	} else {
+		tmp = readb(s3c_rtc_base + S3C2410_TICNT);
+		tmp &= S3C2410_TICNT_ENABLE;
+		tmp |= (128 / freq) - 1;
+		writeb(tmp, s3c_rtc_base + S3C2410_TICNT);
+	}
 
-	writeb(tmp, s3c_rtc_base + S3C2410_TICNT);
 	spin_unlock_irq(&s3c_rtc_pie_lock);
 
 	return 0;
@@ -275,20 +313,29 @@ static int s3c_rtc_setalarm(struct device *dev, struct rtc_wkalrm *alrm)
 
 	s3c_rtc_setaie(0, alrm->enabled);
 
-	if (alrm->enabled)
-		enable_irq_wake(s3c_rtc_alarmno);
-	else
-		disable_irq_wake(s3c_rtc_alarmno);
+	if (s3c_rtc_cpu_type == TYPE_S3C2410) {
+		if (alrm->enabled)
+			enable_irq_wake(s3c_rtc_alarmno);
+		else
+			disable_irq_wake(s3c_rtc_alarmno);
+	}
 
 	return 0;
 }
 
 static int s3c_rtc_proc(struct device *dev, struct seq_file *seq)
 {
-	unsigned int ticnt = readb(s3c_rtc_base + S3C2410_TICNT);
+	unsigned int ticnt;
 
-	seq_printf(seq, "periodic_IRQ\t: %s\n",
-		     (ticnt & S3C2410_TICNT_ENABLE) ? "yes" : "no" );
+	if (s3c_rtc_cpu_type == TYPE_S3C64XX) {
+		ticnt = readw(s3c_rtc_base + S3C2410_RTCCON);
+		ticnt &= S3C64XX_RTCCON_TICEN;
+	} else {
+		ticnt = readb(s3c_rtc_base + S3C2410_TICNT);
+		ticnt &= S3C2410_TICNT_ENABLE;
+	}
+
+	seq_printf(seq, "periodic_IRQ\t: %s\n", ticnt ? "yes" : "no");
 	return 0;
 }
 
@@ -355,11 +402,20 @@ static void s3c_rtc_enable(struct platform_device *pdev, int en)
 		return;
 
 	if (!en) {
-		tmp = readb(base + S3C2410_RTCCON);
-		writeb(tmp & ~S3C2410_RTCCON_RTCEN, base + S3C2410_RTCCON);
+		if (s3c_rtc_cpu_type == TYPE_S3C64XX) {
+			tmp = readw(base + S3C2410_RTCCON);
+			tmp &= ~S3C64XX_RTCCON_TICEN;
+			tmp &= ~S3C2410_RTCCON_RTCEN;
+			writew(tmp, base + S3C2410_RTCCON);
+		} else {
+			tmp = readb(base + S3C2410_RTCCON);
+			writeb(tmp & ~S3C2410_RTCCON_RTCEN,
+				base + S3C2410_RTCCON);
 
-		tmp = readb(base + S3C2410_TICNT);
-		writeb(tmp & ~S3C2410_TICNT_ENABLE, base + S3C2410_TICNT);
+			tmp = readb(base + S3C2410_TICNT);
+			writeb(tmp & ~S3C2410_TICNT_ENABLE,
+				base + S3C2410_TICNT);
+		}
 	} else {
 		/* re-enable the device, and check it is ok */
 
@@ -407,12 +463,16 @@ static int __devinit s3c_rtc_probe(struct platform_device *pdev)
 {
 	struct rtc_device *rtc;
 	struct resource *res;
+	struct clk *clk_rtc;
+	unsigned char tmp, i;
 	int ret;
 
 	pr_debug("%s: probe=%p\n", __func__, pdev);
 
 	/* find the IRQs */
 
+	s3c_rtc_cpu_type = platform_get_device_id(pdev)->driver_data;
+
 	s3c_rtc_tickno = platform_get_irq(pdev, 1);
 	if (s3c_rtc_tickno < 0) {
 		dev_err(&pdev->dev, "no irq for rtc tick\n");
@@ -453,6 +513,11 @@ static int __devinit s3c_rtc_probe(struct platform_device *pdev)
 		goto err_nomap;
 	}
 
+	clk_rtc = clk_get(NULL, "rtc");
+	if (IS_ERR(clk_rtc))
+		dev_err(&pdev->dev, "failed to get clock for RTC\n");
+	clk_enable(clk_rtc);
+
 	/* check to see if everything is setup correctly */
 
 	s3c_rtc_enable(pdev, 1);
@@ -475,7 +540,18 @@ static int __devinit s3c_rtc_probe(struct platform_device *pdev)
 		goto err_nortc;
 	}
 
-	rtc->max_user_freq = 128;
+	if (s3c_rtc_cpu_type == TYPE_S3C64XX) {
+		rtc->max_user_freq = 32768;
+
+		/* 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);
+		}
+	} else {
+		rtc->max_user_freq = 128;
+	}
 
 	platform_set_drvdata(pdev, rtc);
 	return 0;
@@ -495,20 +571,37 @@ static int __devinit s3c_rtc_probe(struct platform_device *pdev)
 
 /* RTC Power management control */
 
-static int ticnt_save;
+static unsigned int ticnt_save;
+static int ticnt_en_save;
 
 static int s3c_rtc_suspend(struct platform_device *pdev, pm_message_t state)
 {
 	/* save TICNT for anyone using periodic interrupts */
-	ticnt_save = readb(s3c_rtc_base + S3C2410_TICNT);
+	if (s3c_rtc_cpu_type == TYPE_S3C64XX) {
+		ticnt_save = readl(s3c_rtc_base + S3C2410_TICNT);
+		ticnt_en_save = readw(s3c_rtc_base + S3C2410_RTCCON) &
+			S3C64XX_RTCCON_TICEN;
+	} else {
+		ticnt_save = readb(s3c_rtc_base + S3C2410_TICNT);
+	}
 	s3c_rtc_enable(pdev, 0);
 	return 0;
 }
 
 static int s3c_rtc_resume(struct platform_device *pdev)
 {
+	unsigned int tmp;
+
 	s3c_rtc_enable(pdev, 1);
-	writeb(ticnt_save, s3c_rtc_base + S3C2410_TICNT);
+	if (s3c_rtc_cpu_type == TYPE_S3C64XX) {
+		writel(ticnt_save, s3c_rtc_base + S3C2410_TICNT);
+		if (ticnt_en_save) {
+			tmp = readw(s3c_rtc_base + S3C2410_RTCCON);
+			writew(tmp | ticnt_en_save, s3c_rtc_base + S3C2410_RTCCON);
+		}
+	} else {
+		writeb(ticnt_save, s3c_rtc_base + S3C2410_TICNT);
+	}
 	return 0;
 }
 #else
@@ -516,11 +609,25 @@ static int s3c_rtc_resume(struct platform_device *pdev)
 #define s3c_rtc_resume  NULL
 #endif
 
+static struct platform_device_id s3c_rtc_driver_ids[] = {
+	{
+		.name		= "s3c2410-rtc",
+		.driver_data	= TYPE_S3C2410,
+	}, {
+		.name		= "s3c64xx-rtc",
+		.driver_data	= TYPE_S3C64XX,
+	},
+	{}
+}
+
+MODULE_DEVICE_TABLE(platform, s3c_rtc_driver_ids);
+
 static struct platform_driver s3c2410_rtc_driver = {
 	.probe		= s3c_rtc_probe,
 	.remove		= __devexit_p(s3c_rtc_remove),
 	.suspend	= s3c_rtc_suspend,
 	.resume		= s3c_rtc_resume,
+	.id_table	= s3c_rtc_driver_ids,
 	.driver		= {
 		.name	= "s3c2410-rtc",
 		.owner	= THIS_MODULE,
-- 
1.6.2.5




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