diff mbox series

[2/2] rtc: s3c: Remove dead code related to periodic tick handling

Message ID 20201202111318.5353-2-m.szyprowski@samsung.com
State New
Headers show
Series [1/2] rtc: s3c: Disable all enable (RTC, tick) bits in the probe | expand

Commit Message

Marek Szyprowski Dec. 2, 2020, 11:13 a.m. UTC 
Support for periodic tick interrupts has been moved from the RTC class to
the HR-timers long time ago. Then it has been removed from this driver by
commits 80d4bb515b78 ("RTC: Cleanup rtc_class_ops->irq_set_state") and
696160fec162 ("RTC: Cleanup rtc_class_ops->irq_set_freq()"). They however
did not remove all the code related to the tick handling. Do it now then.

Signed-off-by: Marek Szyprowski <m.szyprowski@samsung.com>

---
 drivers/rtc/rtc-s3c.c | 226 +-----------------------------------------
 1 file changed, 2 insertions(+), 224 deletions(-)

-- 
2.17.1

Comments

Krzysztof Kozlowski Dec. 2, 2020, 12:49 p.m. UTC | #1 
On Wed, Dec 02, 2020 at 12:13:18PM +0100, Marek Szyprowski wrote:
> Support for periodic tick interrupts has been moved from the RTC class to

> the HR-timers long time ago. Then it has been removed from this driver by

> commits 80d4bb515b78 ("RTC: Cleanup rtc_class_ops->irq_set_state") and

> 696160fec162 ("RTC: Cleanup rtc_class_ops->irq_set_freq()"). They however

> did not remove all the code related to the tick handling. Do it now then.

> 


Update also the bindings (one IRQ less), please.

Reviewed-by: Krzysztof Kozlowski <krzk@kernel.org>


Best regards,
Krzysztof
Marek Szyprowski Dec. 2, 2020, 12:54 p.m. UTC | #2 
Hi Krzysztof,

On 02.12.2020 13:49, Krzysztof Kozlowski wrote:
> On Wed, Dec 02, 2020 at 12:13:18PM +0100, Marek Szyprowski wrote:

>> Support for periodic tick interrupts has been moved from the RTC class to

>> the HR-timers long time ago. Then it has been removed from this driver by

>> commits 80d4bb515b78 ("RTC: Cleanup rtc_class_ops->irq_set_state") and

>> 696160fec162 ("RTC: Cleanup rtc_class_ops->irq_set_freq()"). They however

>> did not remove all the code related to the tick handling. Do it now then.

>>

> Update also the bindings (one IRQ less), please.

>

> Reviewed-by: Krzysztof Kozlowski <krzk@kernel.org>


Well, in theory bindings describe the hardware not the drivers. Hardware 
is still capable of triggering the periodic tick interrupt. It is just a 
Linux kernel policy not to use it at all...

Best regards

-- 
Marek Szyprowski, PhD
Samsung R&D Institute Poland
Krzysztof Kozlowski Dec. 2, 2020, 12:56 p.m. UTC | #3 
On Wed, Dec 02, 2020 at 01:54:32PM +0100, Marek Szyprowski wrote:
> Hi Krzysztof,

> 

> On 02.12.2020 13:49, Krzysztof Kozlowski wrote:

> > On Wed, Dec 02, 2020 at 12:13:18PM +0100, Marek Szyprowski wrote:

> >> Support for periodic tick interrupts has been moved from the RTC class to

> >> the HR-timers long time ago. Then it has been removed from this driver by

> >> commits 80d4bb515b78 ("RTC: Cleanup rtc_class_ops->irq_set_state") and

> >> 696160fec162 ("RTC: Cleanup rtc_class_ops->irq_set_freq()"). They however

> >> did not remove all the code related to the tick handling. Do it now then.

> >>

> > Update also the bindings (one IRQ less), please.

> >

> > Reviewed-by: Krzysztof Kozlowski <krzk@kernel.org>

> 

> Well, in theory bindings describe the hardware not the drivers. Hardware 

> is still capable of triggering the periodic tick interrupt. It is just a 

> Linux kernel policy not to use it at all...


Good point. It will however mean that all DTS (including new) will still
have to provide the tick IRQ. I am fine with this.

Best regards,
Krzysztof
diff mbox series

Patch

diff --git a/drivers/rtc/rtc-s3c.c b/drivers/rtc/rtc-s3c.c
index 16a326e95d46..fab326ba9cec 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,
 };
 
@@ -450,18 +389,12 @@  static int s3c_rtc_probe(struct platform_device *pdev)
 	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 +403,7 @@  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);
@@ -546,18 +478,6 @@  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;
@@ -585,10 +505,6 @@  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);
 
@@ -609,9 +525,6 @@  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) {
@@ -635,162 +548,27 @@  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,
 };