rtc-s3c: add variants for S3C2443 and S3C2416
From: Heiko Stuebner <heiko@...> Date: Fri, 9 Dec 2011 10:50:55 +0100
Commit-Message
Especially the TICNT registers are different from the two rtc types that currently exists. Signed-off-by: Heiko Stuebner <heiko@...>
Patch-Comment
arch/arm/plat-samsung/include/plat/regs-rtc.h | 17 ++++++++++ drivers/rtc/rtc-s3c.c | 43 ++++++++++++++++++++++-- 2 files changed, 56 insertions(+), 4 deletions(-)
Statistics
- 56 lines added
- 4 lines removed
Changes
---------------- arch/arm/plat-samsung/include/plat/regs-rtc.h -----------------
index a7d944f..0f8263e 100644
@@ -22,11 +22,28 @@
#define S3C2410_RTCCON_RTCEN (1 << 0)
#define S3C2410_RTCCON_CNTSEL (1 << 2)
#define S3C2410_RTCCON_CLKRST (1 << 3)
+#define S3C2443_RTCCON_TICSEL (1 << 4)
#define S3C64XX_RTCCON_TICEN (1 << 8)
#define S3C2410_TICNT S3C2410_RTCREG(0x44)
#define S3C2410_TICNT_ENABLE (1 << 7)
+/* S3C2443: tick count is 15 bit wide
+ * TICNT[6:0] contains upper 7 bits
+ * TICNT1[7:0] contains lower 8 bits
+ */
+#define S3C2443_TICNT_PART(x) ((x & 0x7f00) >> 8)
+#define S3C2443_TICNT1 S3C2410_RTCREG(0x4C)
+#define S3C2443_TICNT1_PART(x) (x & 0xff)
+
+/* S3C2416: tick count is 32 bit wide
+ * TICNT[6:0] contains bits [14:8]
+ * TICNT1[7:0] contains lower 8 bits
+ * TICNT2[16:0] contains upper 17 bits
+ */
+#define S3C2416_TICNT2 S3C2410_RTCREG(0x48)
+#define S3C2416_TICNT2_PART(x) ((x & 0xffff8000) >> 15)
+
#define S3C2410_RTCALM S3C2410_RTCREG(0x50)
#define S3C2410_RTCALM_ALMEN (1 << 6)
#define S3C2410_RTCALM_YEAREN (1 << 5)
---------------------------- drivers/rtc/rtc-s3c.c -----------------------------
index 2885b25..4498053 100644
@@ -35,6 +35,8 @@
enum s3c_cpu_type {
TYPE_S3C2410,
+ TYPE_S3C2443,
+ TYPE_S3C2416,
TYPE_S3C64XX,
};
@@ -132,6 +134,7 @@ static int s3c_rtc_setfreq(struct device *dev, int freq)
struct platform_device *pdev = to_platform_device(dev);
struct rtc_device *rtc_dev = platform_get_drvdata(pdev);
unsigned int tmp = 0;
+ int val;
if (!is_power_of_2(freq))
return -EINVAL;
@@ -139,12 +142,24 @@ static int s3c_rtc_setfreq(struct device *dev, int freq)
clk_enable(rtc_clk);
spin_lock_irq(&s3c_rtc_pie_lock);
+ if (s3c_rtc_cpu_type != TYPE_S3C64XX) {
tmp = readb(s3c_rtc_base + S3C2410_TICNT);
tmp &= S3C2410_TICNT_ENABLE;
}
+ val = (rtc_dev->max_user_freq / freq) - 1;
+
+ if (s3c_rtc_cpu_type == TYPE_S3C2443 ||
+ s3c_rtc_cpu_type == TYPE_S3C2416) {
+ tmp |= S3C2443_TICNT_PART(val);
+ writel(S3C2443_TICNT1_PART(val),
+ s3c_rtc_base + S3C2443_TICNT1);
+ if (s3c_rtc_cpu_type == TYPE_S3C2416)
+ writel(S3C2416_TICNT2_PART(val),
+ s3c_rtc_base + S3C2416_TICNT2);
+ } else {
+ tmp |= val;
+ }
writel(tmp, s3c_rtc_base + S3C2410_TICNT);
spin_unlock_irq(&s3c_rtc_pie_lock);
@@ -371,7 +386,7 @@ static void s3c_rtc_enable(struct platform_device *pdev, int en)
tmp &= ~S3C2410_RTCCON_RTCEN;
writew(tmp, base + S3C2410_RTCCON);
+ if (s3c_rtc_cpu_type != TYPE_S3C64XX) {
tmp = readb(base + S3C2410_TICNT);
tmp &= ~S3C2410_TICNT_ENABLE;
writeb(tmp, base + S3C2410_TICNT);
@@ -448,6 +463,7 @@ static int __devinit s3c_rtc_probe(struct platform_device *pdev)
struct rtc_time rtc_tm;
struct resource *res;
int ret;
+ int tmp;
pr_debug("%s: probe=%p\n", __func__, pdev);
@@ -541,11 +557,18 @@ static int __devinit s3c_rtc_probe(struct platform_device *pdev)
dev_warn(&pdev->dev, "warning: invalid RTC value so initializing it\n");
}
+ if (s3c_rtc_cpu_type != TYPE_S3C2410)
rtc->max_user_freq = 32768;
else
rtc->max_user_freq = 128;
+ if (s3c_rtc_cpu_type == TYPE_S3C2443 ||
+ s3c_rtc_cpu_type == TYPE_S3C2416) {
+ tmp = readw(s3c_rtc_base + S3C2410_RTCCON);
+ tmp |= S3C2443_RTCCON_TICSEL;
+ writew(tmp, s3c_rtc_base + S3C2410_RTCCON);
+ }
+
platform_set_drvdata(pdev, rtc);
s3c_rtc_setfreq(&pdev->dev, 1);
@@ -650,6 +673,12 @@ static const struct of_device_id s3c_rtc_dt_match[] = {
.compatible = "samsung,s3c2410-rtc"
.data = TYPE_S3C2410,
}, {
+ .compatible = "samsung,s3c2443-rtc"
+ .data = TYPE_S3C2443,
+ }, {
+ .compatible = "samsung,s3c2416-rtc"
+ .data = TYPE_S3C2416,
+ }, {
.compatible = "samsung,s3c6410-rtc"
.data = TYPE_S3C64XX,
},
@@ -665,6 +694,12 @@ static struct platform_device_id s3c_rtc_driver_ids[] = {
.name = "s3c2410-rtc",
.driver_data = TYPE_S3C2410,
}, {
+ .name = "s3c2443-rtc",
+ .driver_data = TYPE_S3C2443,
+ }, {
+ .name = "s3c2416-rtc",
+ .driver_data = TYPE_S3C2416,
+ }, {
.name = "s3c64xx-rtc",
.driver_data = TYPE_S3C64XX,
},