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path: root/drivers/rtc/rtc-s3c.c
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Diffstat (limited to 'drivers/rtc/rtc-s3c.c')
-rw-r--r--drivers/rtc/rtc-s3c.c256
1 files changed, 9 insertions, 247 deletions
diff --git a/drivers/rtc/rtc-s3c.c b/drivers/rtc/rtc-s3c.c
index e1b50e682fc4..e57d3ca70a78 100644
--- a/drivers/rtc/rtc-s3c.c
+++ b/drivers/rtc/rtc-s3c.c
@@ -42,26 +42,15 @@ struct s3c_rtc {
const struct s3c_rtc_data *data;
int irq_alarm;
- int irq_tick;
-
- spinlock_t pie_lock;
spinlock_t alarm_lock;
- int ticnt_save;
- int ticnt_en_save;
bool wake_en;
};
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);
- void (*enable_tick) (struct s3c_rtc *info, struct seq_file *seq);
- void (*select_tick_clk) (struct s3c_rtc *info);
- void (*save_tick_cnt) (struct s3c_rtc *info);
- void (*restore_tick_cnt) (struct s3c_rtc *info);
void (*enable) (struct s3c_rtc *info);
void (*disable) (struct s3c_rtc *info);
};
@@ -91,17 +80,7 @@ static void s3c_rtc_disable_clk(struct s3c_rtc *info)
clk_disable(info->rtc_clk);
}
-/* IRQ Handlers */
-static irqreturn_t s3c_rtc_tickirq(int irq, void *id)
-{
- struct s3c_rtc *info = (struct s3c_rtc *)id;
-
- if (info->data->irq_handler)
- info->data->irq_handler(info, S3C2410_INTP_TIC);
-
- return IRQ_HANDLED;
-}
-
+/* IRQ Handler */
static irqreturn_t s3c_rtc_alarmirq(int irq, void *id)
{
struct s3c_rtc *info = (struct s3c_rtc *)id;
@@ -148,28 +127,6 @@ static int s3c_rtc_setaie(struct device *dev, unsigned int enabled)
return ret;
}
-/* Set RTC frequency */
-static int s3c_rtc_setfreq(struct s3c_rtc *info, int freq)
-{
- int ret;
-
- if (!is_power_of_2(freq))
- return -EINVAL;
-
- ret = s3c_rtc_enable_clk(info);
- if (ret)
- return ret;
- spin_lock_irq(&info->pie_lock);
-
- if (info->data->set_freq)
- info->data->set_freq(info, freq);
-
- spin_unlock_irq(&info->pie_lock);
- s3c_rtc_disable_clk(info);
-
- return 0;
-}
-
/* Time read/write */
static int s3c_rtc_gettime(struct device *dev, struct rtc_time *rtc_tm)
{
@@ -348,29 +305,11 @@ static int s3c_rtc_setalarm(struct device *dev, struct rtc_wkalrm *alrm)
return 0;
}
-static int s3c_rtc_proc(struct device *dev, struct seq_file *seq)
-{
- struct s3c_rtc *info = dev_get_drvdata(dev);
- int ret;
-
- ret = s3c_rtc_enable_clk(info);
- if (ret)
- return ret;
-
- if (info->data->enable_tick)
- info->data->enable_tick(info, seq);
-
- s3c_rtc_disable_clk(info);
-
- return 0;
-}
-
static const struct rtc_class_ops s3c_rtcops = {
.read_time = s3c_rtc_gettime,
.set_time = s3c_rtc_settime,
.read_alarm = s3c_rtc_getalarm,
.set_alarm = s3c_rtc_setalarm,
- .proc = s3c_rtc_proc,
.alarm_irq_enable = s3c_rtc_setaie,
};
@@ -443,25 +382,18 @@ static int s3c_rtc_remove(struct platform_device *pdev)
static int s3c_rtc_probe(struct platform_device *pdev)
{
struct s3c_rtc *info = NULL;
- struct rtc_time rtc_tm;
int ret;
info = devm_kzalloc(&pdev->dev, sizeof(*info), GFP_KERNEL);
if (!info)
return -ENOMEM;
- /* find the IRQs */
- info->irq_tick = platform_get_irq(pdev, 1);
- if (info->irq_tick < 0)
- return info->irq_tick;
-
info->dev = &pdev->dev;
info->data = of_device_get_match_data(&pdev->dev);
if (!info->data) {
dev_err(&pdev->dev, "failed getting s3c_rtc_data\n");
return -EINVAL;
}
- spin_lock_init(&info->pie_lock);
spin_lock_init(&info->alarm_lock);
platform_set_drvdata(pdev, info);
@@ -470,8 +402,7 @@ static int s3c_rtc_probe(struct platform_device *pdev)
if (info->irq_alarm < 0)
return info->irq_alarm;
- dev_dbg(&pdev->dev, "s3c2410_rtc: tick irq %d, alarm irq %d\n",
- info->irq_tick, info->irq_alarm);
+ dev_dbg(&pdev->dev, "s3c2410_rtc: alarm irq %d\n", info->irq_alarm);
/* get the memory region */
info->base = devm_platform_ioremap_resource(pdev, 0);
@@ -494,13 +425,8 @@ static int s3c_rtc_probe(struct platform_device *pdev)
if (info->data->needs_src_clk) {
info->rtc_src_clk = devm_clk_get(&pdev->dev, "rtc_src");
if (IS_ERR(info->rtc_src_clk)) {
- ret = PTR_ERR(info->rtc_src_clk);
- if (ret != -EPROBE_DEFER)
- dev_err(&pdev->dev,
- "failed to find rtc source clock\n");
- else
- dev_dbg(&pdev->dev,
- "probe deferred due to missing rtc src clk\n");
+ ret = dev_err_probe(&pdev->dev, PTR_ERR(info->rtc_src_clk),
+ "failed to find rtc source clock\n");
goto err_src_clk;
}
ret = clk_prepare_enable(info->rtc_src_clk);
@@ -508,6 +434,10 @@ static int s3c_rtc_probe(struct platform_device *pdev)
goto err_src_clk;
}
+ /* disable RTC enable bits potentially set by the bootloader */
+ if (info->data->disable)
+ info->data->disable(info);
+
/* check to see if everything is setup correctly */
if (info->data->enable)
info->data->enable(info);
@@ -517,20 +447,6 @@ static int s3c_rtc_probe(struct platform_device *pdev)
device_init_wakeup(&pdev->dev, 1);
- /* Check RTC Time */
- if (s3c_rtc_gettime(&pdev->dev, &rtc_tm)) {
- rtc_tm.tm_year = 100;
- rtc_tm.tm_mon = 0;
- rtc_tm.tm_mday = 1;
- rtc_tm.tm_hour = 0;
- rtc_tm.tm_min = 0;
- rtc_tm.tm_sec = 0;
-
- s3c_rtc_settime(&pdev->dev, &rtc_tm);
-
- dev_warn(&pdev->dev, "warning: invalid RTC value so initializing it\n");
- }
-
/* register RTC and exit */
info->rtc = devm_rtc_device_register(&pdev->dev, "s3c", &s3c_rtcops,
THIS_MODULE);
@@ -547,18 +463,6 @@ static int s3c_rtc_probe(struct platform_device *pdev)
goto err_nortc;
}
- ret = devm_request_irq(&pdev->dev, info->irq_tick, s3c_rtc_tickirq,
- 0, "s3c2410-rtc tick", info);
- if (ret) {
- dev_err(&pdev->dev, "IRQ%d error %d\n", info->irq_tick, ret);
- goto err_nortc;
- }
-
- if (info->data->select_tick_clk)
- info->data->select_tick_clk(info);
-
- s3c_rtc_setfreq(info, 1);
-
s3c_rtc_disable_clk(info);
return 0;
@@ -586,10 +490,6 @@ static int s3c_rtc_suspend(struct device *dev)
if (ret)
return ret;
- /* save TICNT for anyone using periodic interrupts */
- if (info->data->save_tick_cnt)
- info->data->save_tick_cnt(info);
-
if (info->data->disable)
info->data->disable(info);
@@ -610,9 +510,6 @@ static int s3c_rtc_resume(struct device *dev)
if (info->data->enable)
info->data->enable(info);
- if (info->data->restore_tick_cnt)
- info->data->restore_tick_cnt(info);
-
s3c_rtc_disable_clk(info);
if (device_may_wakeup(dev) && info->wake_en) {
@@ -636,167 +533,32 @@ static void s3c6410_rtc_irq(struct s3c_rtc *info, int mask)
writeb(mask, info->base + S3C2410_INTP);
}
-static void s3c2410_rtc_setfreq(struct s3c_rtc *info, int freq)
-{
- unsigned int tmp = 0;
- int val;
-
- tmp = readb(info->base + S3C2410_TICNT);
- tmp &= S3C2410_TICNT_ENABLE;
-
- val = (info->rtc->max_user_freq / freq) - 1;
- tmp |= val;
-
- writel(tmp, info->base + S3C2410_TICNT);
-}
-
-static void s3c2416_rtc_setfreq(struct s3c_rtc *info, int freq)
-{
- unsigned int tmp = 0;
- int val;
-
- tmp = readb(info->base + S3C2410_TICNT);
- tmp &= S3C2410_TICNT_ENABLE;
-
- val = (info->rtc->max_user_freq / freq) - 1;
-
- tmp |= S3C2443_TICNT_PART(val);
- writel(S3C2443_TICNT1_PART(val), info->base + S3C2443_TICNT1);
-
- writel(S3C2416_TICNT2_PART(val), info->base + S3C2416_TICNT2);
-
- writel(tmp, info->base + S3C2410_TICNT);
-}
-
-static void s3c2443_rtc_setfreq(struct s3c_rtc *info, int freq)
-{
- unsigned int tmp = 0;
- int val;
-
- tmp = readb(info->base + S3C2410_TICNT);
- tmp &= S3C2410_TICNT_ENABLE;
-
- val = (info->rtc->max_user_freq / freq) - 1;
-
- tmp |= S3C2443_TICNT_PART(val);
- writel(S3C2443_TICNT1_PART(val), info->base + S3C2443_TICNT1);
-
- writel(tmp, info->base + S3C2410_TICNT);
-}
-
-static void s3c6410_rtc_setfreq(struct s3c_rtc *info, int freq)
-{
- int val;
-
- val = (info->rtc->max_user_freq / freq) - 1;
- writel(val, info->base + S3C2410_TICNT);
-}
-
-static void s3c24xx_rtc_enable_tick(struct s3c_rtc *info, struct seq_file *seq)
-{
- unsigned int ticnt;
-
- ticnt = readb(info->base + S3C2410_TICNT);
- ticnt &= S3C2410_TICNT_ENABLE;
-
- seq_printf(seq, "periodic_IRQ\t: %s\n", ticnt ? "yes" : "no");
-}
-
-static void s3c2416_rtc_select_tick_clk(struct s3c_rtc *info)
-{
- unsigned int con;
-
- con = readw(info->base + S3C2410_RTCCON);
- con |= S3C2443_RTCCON_TICSEL;
- writew(con, info->base + S3C2410_RTCCON);
-}
-
-static void s3c6410_rtc_enable_tick(struct s3c_rtc *info, struct seq_file *seq)
-{
- unsigned int ticnt;
-
- ticnt = readw(info->base + S3C2410_RTCCON);
- ticnt &= S3C64XX_RTCCON_TICEN;
-
- seq_printf(seq, "periodic_IRQ\t: %s\n", ticnt ? "yes" : "no");
-}
-
-static void s3c24xx_rtc_save_tick_cnt(struct s3c_rtc *info)
-{
- info->ticnt_save = readb(info->base + S3C2410_TICNT);
-}
-
-static void s3c24xx_rtc_restore_tick_cnt(struct s3c_rtc *info)
-{
- writeb(info->ticnt_save, info->base + S3C2410_TICNT);
-}
-
-static void s3c6410_rtc_save_tick_cnt(struct s3c_rtc *info)
-{
- info->ticnt_en_save = readw(info->base + S3C2410_RTCCON);
- info->ticnt_en_save &= S3C64XX_RTCCON_TICEN;
- info->ticnt_save = readl(info->base + S3C2410_TICNT);
-}
-
-static void s3c6410_rtc_restore_tick_cnt(struct s3c_rtc *info)
-{
- unsigned int con;
-
- writel(info->ticnt_save, info->base + S3C2410_TICNT);
- if (info->ticnt_en_save) {
- con = readw(info->base + S3C2410_RTCCON);
- writew(con | info->ticnt_en_save, info->base + S3C2410_RTCCON);
- }
-}
-
static struct s3c_rtc_data const s3c2410_rtc_data = {
- .max_user_freq = 128,
.irq_handler = s3c24xx_rtc_irq,
- .set_freq = s3c2410_rtc_setfreq,
- .enable_tick = s3c24xx_rtc_enable_tick,
- .save_tick_cnt = s3c24xx_rtc_save_tick_cnt,
- .restore_tick_cnt = s3c24xx_rtc_restore_tick_cnt,
.enable = s3c24xx_rtc_enable,
.disable = s3c24xx_rtc_disable,
};
static struct s3c_rtc_data const s3c2416_rtc_data = {
- .max_user_freq = 32768,
.irq_handler = s3c24xx_rtc_irq,
- .set_freq = s3c2416_rtc_setfreq,
- .enable_tick = s3c24xx_rtc_enable_tick,
- .select_tick_clk = s3c2416_rtc_select_tick_clk,
- .save_tick_cnt = s3c24xx_rtc_save_tick_cnt,
- .restore_tick_cnt = s3c24xx_rtc_restore_tick_cnt,
.enable = s3c24xx_rtc_enable,
.disable = s3c24xx_rtc_disable,
};
static struct s3c_rtc_data const s3c2443_rtc_data = {
- .max_user_freq = 32768,
.irq_handler = s3c24xx_rtc_irq,
- .set_freq = s3c2443_rtc_setfreq,
- .enable_tick = s3c24xx_rtc_enable_tick,
- .select_tick_clk = s3c2416_rtc_select_tick_clk,
- .save_tick_cnt = s3c24xx_rtc_save_tick_cnt,
- .restore_tick_cnt = s3c24xx_rtc_restore_tick_cnt,
.enable = s3c24xx_rtc_enable,
.disable = s3c24xx_rtc_disable,
};
static struct s3c_rtc_data const s3c6410_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[] = {
+static const __maybe_unused struct of_device_id s3c_rtc_dt_match[] = {
{
.compatible = "samsung,s3c2410-rtc",
.data = &s3c2410_rtc_data,
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