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path: root/drivers/rtc
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Diffstat (limited to 'drivers/rtc')
-rw-r--r--drivers/rtc/rtc-s3c.c93
1 files changed, 92 insertions, 1 deletions
diff --git a/drivers/rtc/rtc-s3c.c b/drivers/rtc/rtc-s3c.c
index 0d9089228bb0..a6b1252c9941 100644
--- a/drivers/rtc/rtc-s3c.c
+++ b/drivers/rtc/rtc-s3c.c
@@ -38,6 +38,7 @@ struct s3c_rtc {
void __iomem *base;
struct clk *rtc_clk;
+ struct clk *rtc_src_clk;
bool enabled;
struct s3c_rtc_data *data;
@@ -54,6 +55,7 @@ struct s3c_rtc {
struct s3c_rtc_data {
int max_user_freq;
+ bool needs_src_clk;
void (*irq_handler) (struct s3c_rtc *info, int mask);
void (*set_freq) (struct s3c_rtc *info, int freq);
@@ -73,10 +75,14 @@ static void s3c_rtc_alarm_clk_enable(struct s3c_rtc *info, bool enable)
if (enable) {
if (!info->enabled) {
clk_enable(info->rtc_clk);
+ if (info->data->needs_src_clk)
+ clk_enable(info->rtc_src_clk);
info->enabled = true;
}
} else {
if (info->enabled) {
+ if (info->data->needs_src_clk)
+ clk_disable(info->rtc_src_clk);
clk_disable(info->rtc_clk);
info->enabled = false;
}
@@ -114,12 +120,16 @@ static int s3c_rtc_setaie(struct device *dev, unsigned int enabled)
dev_dbg(info->dev, "%s: aie=%d\n", __func__, enabled);
clk_enable(info->rtc_clk);
+ if (info->data->needs_src_clk)
+ clk_enable(info->rtc_src_clk);
tmp = readb(info->base + S3C2410_RTCALM) & ~S3C2410_RTCALM_ALMEN;
if (enabled)
tmp |= S3C2410_RTCALM_ALMEN;
writeb(tmp, info->base + S3C2410_RTCALM);
+ if (info->data->needs_src_clk)
+ clk_disable(info->rtc_src_clk);
clk_disable(info->rtc_clk);
s3c_rtc_alarm_clk_enable(info, enabled);
@@ -134,12 +144,16 @@ static int s3c_rtc_setfreq(struct s3c_rtc *info, int freq)
return -EINVAL;
clk_enable(info->rtc_clk);
+ if (info->data->needs_src_clk)
+ clk_enable(info->rtc_src_clk);
spin_lock_irq(&info->pie_lock);
if (info->data->set_freq)
info->data->set_freq(info, freq);
spin_unlock_irq(&info->pie_lock);
+ if (info->data->needs_src_clk)
+ clk_disable(info->rtc_src_clk);
clk_disable(info->rtc_clk);
return 0;
@@ -152,6 +166,9 @@ static int s3c_rtc_gettime(struct device *dev, struct rtc_time *rtc_tm)
unsigned int have_retried = 0;
clk_enable(info->rtc_clk);
+ if (info->data->needs_src_clk)
+ clk_enable(info->rtc_src_clk);
+
retry_get_time:
rtc_tm->tm_min = readb(info->base + S3C2410_RTCMIN);
rtc_tm->tm_hour = readb(info->base + S3C2410_RTCHOUR);
@@ -185,6 +202,8 @@ static int s3c_rtc_gettime(struct device *dev, struct rtc_time *rtc_tm)
rtc_tm->tm_mon -= 1;
+ if (info->data->needs_src_clk)
+ clk_disable(info->rtc_src_clk);
clk_disable(info->rtc_clk);
return rtc_valid_tm(rtc_tm);
@@ -207,6 +226,8 @@ static int s3c_rtc_settime(struct device *dev, struct rtc_time *tm)
}
clk_enable(info->rtc_clk);
+ if (info->data->needs_src_clk)
+ clk_enable(info->rtc_src_clk);
writeb(bin2bcd(tm->tm_sec), info->base + S3C2410_RTCSEC);
writeb(bin2bcd(tm->tm_min), info->base + S3C2410_RTCMIN);
@@ -215,6 +236,8 @@ static int s3c_rtc_settime(struct device *dev, struct rtc_time *tm)
writeb(bin2bcd(tm->tm_mon + 1), info->base + S3C2410_RTCMON);
writeb(bin2bcd(year), info->base + S3C2410_RTCYEAR);
+ if (info->data->needs_src_clk)
+ clk_disable(info->rtc_src_clk);
clk_disable(info->rtc_clk);
return 0;
@@ -227,6 +250,9 @@ static int s3c_rtc_getalarm(struct device *dev, struct rtc_wkalrm *alrm)
unsigned int alm_en;
clk_enable(info->rtc_clk);
+ if (info->data->needs_src_clk)
+ clk_enable(info->rtc_src_clk);
+
alm_tm->tm_sec = readb(info->base + S3C2410_ALMSEC);
alm_tm->tm_min = readb(info->base + S3C2410_ALMMIN);
alm_tm->tm_hour = readb(info->base + S3C2410_ALMHOUR);
@@ -278,7 +304,10 @@ static int s3c_rtc_getalarm(struct device *dev, struct rtc_wkalrm *alrm)
else
alm_tm->tm_year = -1;
+ if (info->data->needs_src_clk)
+ clk_disable(info->rtc_src_clk);
clk_disable(info->rtc_clk);
+
return 0;
}
@@ -289,6 +318,9 @@ static int s3c_rtc_setalarm(struct device *dev, struct rtc_wkalrm *alrm)
unsigned int alrm_en;
clk_enable(info->rtc_clk);
+ if (info->data->needs_src_clk)
+ clk_enable(info->rtc_src_clk);
+
dev_dbg(dev, "s3c_rtc_setalarm: %d, %04d.%02d.%02d %02d:%02d:%02d\n",
alrm->enabled,
1900 + tm->tm_year, tm->tm_mon + 1, tm->tm_mday,
@@ -318,6 +350,8 @@ static int s3c_rtc_setalarm(struct device *dev, struct rtc_wkalrm *alrm)
s3c_rtc_setaie(dev, alrm->enabled);
+ if (info->data->needs_src_clk)
+ clk_disable(info->rtc_src_clk);
clk_disable(info->rtc_clk);
return 0;
@@ -328,10 +362,14 @@ static int s3c_rtc_proc(struct device *dev, struct seq_file *seq)
struct s3c_rtc *info = dev_get_drvdata(dev);
clk_enable(info->rtc_clk);
+ if (info->data->needs_src_clk)
+ clk_enable(info->rtc_src_clk);
if (info->data->enable_tick)
info->data->enable_tick(info, seq);
+ if (info->data->needs_src_clk)
+ clk_disable(info->rtc_src_clk);
clk_disable(info->rtc_clk);
return 0;
@@ -351,6 +389,8 @@ static void s3c24xx_rtc_enable(struct s3c_rtc *info)
unsigned int con, tmp;
clk_enable(info->rtc_clk);
+ if (info->data->needs_src_clk)
+ clk_enable(info->rtc_src_clk);
con = readw(info->base + S3C2410_RTCCON);
/* re-enable the device, and check it is ok */
@@ -378,6 +418,8 @@ static void s3c24xx_rtc_enable(struct s3c_rtc *info)
info->base + S3C2410_RTCCON);
}
+ if (info->data->needs_src_clk)
+ clk_disable(info->rtc_src_clk);
clk_disable(info->rtc_clk);
}
@@ -386,6 +428,8 @@ static void s3c24xx_rtc_disable(struct s3c_rtc *info)
unsigned int con;
clk_enable(info->rtc_clk);
+ if (info->data->needs_src_clk)
+ clk_enable(info->rtc_src_clk);
con = readw(info->base + S3C2410_RTCCON);
con &= ~S3C2410_RTCCON_RTCEN;
@@ -395,6 +439,8 @@ static void s3c24xx_rtc_disable(struct s3c_rtc *info)
con &= ~S3C2410_TICNT_ENABLE;
writeb(con, info->base + S3C2410_TICNT);
+ if (info->data->needs_src_clk)
+ clk_disable(info->rtc_src_clk);
clk_disable(info->rtc_clk);
}
@@ -403,12 +449,16 @@ static void s3c6410_rtc_disable(struct s3c_rtc *info)
unsigned int con;
clk_enable(info->rtc_clk);
+ if (info->data->needs_src_clk)
+ clk_enable(info->rtc_src_clk);
con = readw(info->base + S3C2410_RTCCON);
con &= ~S3C64XX_RTCCON_TICEN;
con &= ~S3C2410_RTCCON_RTCEN;
writew(con, info->base + S3C2410_RTCCON);
+ if (info->data->needs_src_clk)
+ clk_disable(info->rtc_src_clk);
clk_disable(info->rtc_clk);
}
@@ -480,11 +530,19 @@ static int s3c_rtc_probe(struct platform_device *pdev)
info->rtc_clk = devm_clk_get(&pdev->dev, "rtc");
if (IS_ERR(info->rtc_clk)) {
- dev_err(&pdev->dev, "failed to find rtc clock source\n");
+ dev_err(&pdev->dev, "failed to find rtc clock\n");
return PTR_ERR(info->rtc_clk);
}
clk_prepare_enable(info->rtc_clk);
+ info->rtc_src_clk = devm_clk_get(&pdev->dev, "rtc_src");
+ if (IS_ERR(info->rtc_src_clk)) {
+ dev_err(&pdev->dev, "failed to find rtc source clock\n");
+ return PTR_ERR(info->rtc_src_clk);
+ }
+ clk_prepare_enable(info->rtc_src_clk);
+
+
/* check to see if everything is setup correctly */
if (info->data->enable)
info->data->enable(info);
@@ -538,6 +596,8 @@ static int s3c_rtc_probe(struct platform_device *pdev)
s3c_rtc_setfreq(info, 1);
+ if (info->data->needs_src_clk)
+ clk_disable(info->rtc_src_clk);
clk_disable(info->rtc_clk);
return 0;
@@ -557,6 +617,8 @@ static int s3c_rtc_suspend(struct device *dev)
struct s3c_rtc *info = dev_get_drvdata(dev);
clk_enable(info->rtc_clk);
+ if (info->data->needs_src_clk)
+ clk_enable(info->rtc_src_clk);
/* save TICNT for anyone using periodic interrupts */
if (info->data->save_tick_cnt)
@@ -572,6 +634,8 @@ static int s3c_rtc_suspend(struct device *dev)
dev_err(dev, "enable_irq_wake failed\n");
}
+ if (info->data->needs_src_clk)
+ clk_disable(info->rtc_src_clk);
clk_disable(info->rtc_clk);
return 0;
@@ -582,6 +646,8 @@ static int s3c_rtc_resume(struct device *dev)
struct s3c_rtc *info = dev_get_drvdata(dev);
clk_enable(info->rtc_clk);
+ if (info->data->needs_src_clk)
+ clk_enable(info->rtc_src_clk);
if (info->data->enable)
info->data->enable(info);
@@ -594,6 +660,8 @@ static int s3c_rtc_resume(struct device *dev)
info->wake_en = false;
}
+ if (info->data->needs_src_clk)
+ clk_disable(info->rtc_src_clk);
clk_disable(info->rtc_clk);
return 0;
@@ -604,7 +672,11 @@ static SIMPLE_DEV_PM_OPS(s3c_rtc_pm_ops, s3c_rtc_suspend, s3c_rtc_resume);
static void s3c24xx_rtc_irq(struct s3c_rtc *info, int mask)
{
clk_enable(info->rtc_clk);
+ if (info->data->needs_src_clk)
+ clk_enable(info->rtc_src_clk);
rtc_update_irq(info->rtc, 1, RTC_AF | RTC_IRQF);
+ if (info->data->needs_src_clk)
+ clk_disable(info->rtc_src_clk);
clk_disable(info->rtc_clk);
s3c_rtc_alarm_clk_enable(info, false);
@@ -613,8 +685,12 @@ static void s3c24xx_rtc_irq(struct s3c_rtc *info, int mask)
static void s3c6410_rtc_irq(struct s3c_rtc *info, int mask)
{
clk_enable(info->rtc_clk);
+ if (info->data->needs_src_clk)
+ clk_enable(info->rtc_src_clk);
rtc_update_irq(info->rtc, 1, RTC_AF | RTC_IRQF);
writeb(mask, info->base + S3C2410_INTP);
+ if (info->data->needs_src_clk)
+ clk_disable(info->rtc_src_clk);
clk_disable(info->rtc_clk);
s3c_rtc_alarm_clk_enable(info, false);
@@ -780,6 +856,18 @@ static struct s3c_rtc_data const s3c6410_rtc_data = {
.disable = s3c6410_rtc_disable,
};
+static struct s3c_rtc_data const exynos3250_rtc_data = {
+ .max_user_freq = 32768,
+ .needs_src_clk = true,
+ .irq_handler = s3c6410_rtc_irq,
+ .set_freq = s3c6410_rtc_setfreq,
+ .enable_tick = s3c6410_rtc_enable_tick,
+ .save_tick_cnt = s3c6410_rtc_save_tick_cnt,
+ .restore_tick_cnt = s3c6410_rtc_restore_tick_cnt,
+ .enable = s3c24xx_rtc_enable,
+ .disable = s3c6410_rtc_disable,
+};
+
static const struct of_device_id s3c_rtc_dt_match[] = {
{
.compatible = "samsung,s3c2410-rtc",
@@ -793,6 +881,9 @@ static const struct of_device_id s3c_rtc_dt_match[] = {
}, {
.compatible = "samsung,s3c6410-rtc",
.data = (void *)&s3c6410_rtc_data,
+ }, {
+ .compatible = "samsung,exynos3250-rtc",
+ .data = (void *)&exynos3250_rtc_data,
},
{ /* sentinel */ },
};
generated by cgit v1.2.3 (git 2.25.1) at 2024-11-22 15:41:57 +0000