[PATCH 01/15] clocksource/drivers/h8300_timer8: Fix compilation error with dev_warn

[PATCH 01/15] clocksource/drivers/h8300_timer8: Fix compilation error with dev_warn

[Daniel Lezcano]

The dev_warn is using the platform driver which was removed in the previous
patch.

Let's replace dev_warn by pr_warn.

Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org>
---
 drivers/clocksource/h8300_timer8.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/clocksource/h8300_timer8.c b/drivers/clocksource/h8300_timer8.c
index f0680eb..35b0e8f 100644
--- a/drivers/clocksource/h8300_timer8.c
+++ b/drivers/clocksource/h8300_timer8.c
@@ -98,7 +98,7 @@ static void timer8_set_next(struct timer8_priv *p, unsigned long delta)
 
 	raw_spin_lock_irqsave(&p->lock, flags);
 	if (delta >= 0x10000)
-		dev_warn(&p->pdev->dev, "delta out of range\n");
+		pr_warn("delta out of range\n");
 	now = timer8_get_counter(p);
 	p->tcora = delta;
 	ctrl_outb(ctrl_inb(p->mapbase + _8TCR) | 0x40, p->mapbase + _8TCR);
-- 
1.9.1

[PATCH 02/15] clocksource/drivers/h8300_tpu: Remove unused macros

[Daniel Lezcano]

Some macros are unused, delete them.

Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org>
---
 drivers/clocksource/h8300_tpu.c | 13 +++----------
 1 file changed, 3 insertions(+), 10 deletions(-)

diff --git a/drivers/clocksource/h8300_tpu.c b/drivers/clocksource/h8300_tpu.c
index ed0b493..576dae6 100644
--- a/drivers/clocksource/h8300_tpu.c
+++ b/drivers/clocksource/h8300_tpu.c
@@ -20,16 +20,9 @@
 #include <linux/of_address.h>
 #include <linux/of_irq.h>
 
-#define TCR	0
-#define TMDR	1
-#define TIOR	2
-#define TER	4
-#define TSR	5
-#define TCNT	6
-#define TGRA	8
-#define TGRB	10
-#define TGRC	12
-#define TGRD	14
+#define TCR	0x0
+#define TSR	0x5
+#define TCNT	0x6
 
 struct tpu_priv {
 	struct clocksource cs;
-- 
1.9.1

Re: [PATCH 02/15] clocksource/drivers/h8300_tpu: Remove unused macros

[Yoshinori Sato]

On Mon, 09 Nov 2015 19:06:40 +0900,
Daniel Lezcano wrote:
> 
> Some macros are unused, delete them.
> 
> Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org>

Acked-by: Yoshinori Sato <ysato@users.sourceforge.jp>

> ---
>  drivers/clocksource/h8300_tpu.c | 13 +++----------
>  1 file changed, 3 insertions(+), 10 deletions(-)
> 
> diff --git a/drivers/clocksource/h8300_tpu.c b/drivers/clocksource/h8300_tpu.c
> index ed0b493..576dae6 100644
> --- a/drivers/clocksource/h8300_tpu.c
> +++ b/drivers/clocksource/h8300_tpu.c
> @@ -20,16 +20,9 @@
>  #include <linux/of_address.h>
>  #include <linux/of_irq.h>
>  
> -#define TCR	0
> -#define TMDR	1
> -#define TIOR	2
> -#define TER	4
> -#define TSR	5
> -#define TCNT	6
> -#define TGRA	8
> -#define TGRB	10
> -#define TGRC	12
> -#define TGRD	14
> +#define TCR	0x0
> +#define TSR	0x5
> +#define TCNT	0x6
>  
>  struct tpu_priv {
>  	struct clocksource cs;
> -- 
> 1.9.1
> 

[PATCH 03/15] clocksource/drivers/h8300_tpu: Remove pointless headers for TPU

[Daniel Lezcano]

Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org>
---
 drivers/clocksource/h8300_tpu.c | 5 -----
 1 file changed, 5 deletions(-)

diff --git a/drivers/clocksource/h8300_tpu.c b/drivers/clocksource/h8300_tpu.c
index 576dae6..c1eef42 100644
--- a/drivers/clocksource/h8300_tpu.c
+++ b/drivers/clocksource/h8300_tpu.c
@@ -6,14 +6,9 @@
  */
 
 #include <linux/errno.h>
-#include <linux/sched.h>
 #include <linux/kernel.h>
-#include <linux/interrupt.h>
 #include <linux/init.h>
-#include <linux/platform_device.h>
-#include <linux/slab.h>
 #include <linux/clocksource.h>
-#include <linux/module.h>
 #include <linux/clk.h>
 #include <linux/io.h>
 #include <linux/of.h>
-- 
1.9.1

Re: [PATCH 03/15] clocksource/drivers/h8300_tpu: Remove pointless headers for TPU

[Yoshinori Sato]

On Mon, 09 Nov 2015 19:06:41 +0900,
Daniel Lezcano wrote:
> 
> Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org>

Acked-by: Yoshinori Sato <ysato@users.sourceforge.jp>

> ---
>  drivers/clocksource/h8300_tpu.c | 5 -----
>  1 file changed, 5 deletions(-)
> 
> diff --git a/drivers/clocksource/h8300_tpu.c b/drivers/clocksource/h8300_tpu.c
> index 576dae6..c1eef42 100644
> --- a/drivers/clocksource/h8300_tpu.c
> +++ b/drivers/clocksource/h8300_tpu.c
> @@ -6,14 +6,9 @@
>   */
>  
>  #include <linux/errno.h>
> -#include <linux/sched.h>
>  #include <linux/kernel.h>
> -#include <linux/interrupt.h>
>  #include <linux/init.h>
> -#include <linux/platform_device.h>
> -#include <linux/slab.h>
>  #include <linux/clocksource.h>
> -#include <linux/module.h>
>  #include <linux/clk.h>
>  #include <linux/io.h>
>  #include <linux/of.h>
> -- 
> 1.9.1
> 

[PATCH 04/15] clocksource/drivers/h8300_timer8: Remove unused headers

[Daniel Lezcano]

Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org>
---
 drivers/clocksource/h8300_timer8.c | 5 -----
 1 file changed, 5 deletions(-)

diff --git a/drivers/clocksource/h8300_timer8.c b/drivers/clocksource/h8300_timer8.c
index 35b0e8f..62a7f8c 100644
--- a/drivers/clocksource/h8300_timer8.c
+++ b/drivers/clocksource/h8300_timer8.c
@@ -8,21 +8,16 @@
  */
 
 #include <linux/errno.h>
-#include <linux/sched.h>
 #include <linux/kernel.h>
 #include <linux/interrupt.h>
 #include <linux/init.h>
-#include <linux/slab.h>
 #include <linux/clockchips.h>
-#include <linux/module.h>
 #include <linux/clk.h>
 #include <linux/io.h>
 #include <linux/of.h>
 #include <linux/of_address.h>
 #include <linux/of_irq.h>
 
-#include <asm/irq.h>
-
 #define _8TCR	0
 #define _8TCSR	2
 #define TCORA	4
-- 
1.9.1

[PATCH 05/15] clocksource/drivers/h8300_timer8: Remove unused macros

[Daniel Lezcano]

Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org>
---
 drivers/clocksource/h8300_timer8.c | 4 ----
 1 file changed, 4 deletions(-)

diff --git a/drivers/clocksource/h8300_timer8.c b/drivers/clocksource/h8300_timer8.c
index 62a7f8c..88b9b06 100644
--- a/drivers/clocksource/h8300_timer8.c
+++ b/drivers/clocksource/h8300_timer8.c
@@ -24,7 +24,6 @@
 #define TCORB	6
 #define _8TCNT	8
 
-#define FLAG_REPROGRAM (1 << 0)
 #define FLAG_SKIPEVENT (1 << 1)
 #define FLAG_IRQCONTEXT (1 << 2)
 #define FLAG_STARTED (1 << 3)
@@ -32,9 +31,6 @@
 #define ONESHOT  0
 #define PERIODIC 1
 
-#define RELATIVE 0
-#define ABSOLUTE 1
-
 #define SCALE 64
 
 struct timer8_priv {
-- 
1.9.1

[PATCH 06/15] clocksource/drivers/h8300_timer8: Remove PERIODIC and ONESHOT macro

[Daniel Lezcano]

Specify the delta as parameter for the timer8_clock_event_start function
instead of using a macro to tell PERIODIC or ONESHOT.

Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org>
---
 drivers/clocksource/h8300_timer8.c | 11 ++++-------
 1 file changed, 4 insertions(+), 7 deletions(-)

diff --git a/drivers/clocksource/h8300_timer8.c b/drivers/clocksource/h8300_timer8.c
index 88b9b06..2433325 100644
--- a/drivers/clocksource/h8300_timer8.c
+++ b/drivers/clocksource/h8300_timer8.c
@@ -28,9 +28,6 @@
 #define FLAG_IRQCONTEXT (1 << 2)
 #define FLAG_STARTED (1 << 3)
 
-#define ONESHOT  0
-#define PERIODIC 1
-
 #define SCALE 64
 
 struct timer8_priv {
@@ -147,7 +144,7 @@ static inline struct timer8_priv *ced_to_priv(struct clock_event_device *ced)
 	return container_of(ced, struct timer8_priv, ced);
 }
 
-static void timer8_clock_event_start(struct timer8_priv *p, int periodic)
+static void timer8_clock_event_start(struct timer8_priv *p, unsigned long delta)
 {
 	struct clock_event_device *ced = &p->ced;
 
@@ -158,7 +155,7 @@ static void timer8_clock_event_start(struct timer8_priv *p, int periodic)
 	ced->max_delta_ns = clockevent_delta2ns(0xffff, ced);
 	ced->min_delta_ns = clockevent_delta2ns(0x0001, ced);
 
-	timer8_set_next(p, periodic?(p->rate + HZ/2) / HZ:0x10000);
+	timer8_set_next(p, delta);
 }
 
 static int timer8_clock_event_shutdown(struct clock_event_device *ced)
@@ -173,7 +170,7 @@ static int timer8_clock_event_periodic(struct clock_event_device *ced)
 
 	pr_info("%s: used for periodic clock events\n", ced->name);
 	timer8_stop(p);
-	timer8_clock_event_start(p, PERIODIC);
+	timer8_clock_event_start(p, (p->rate + HZ/2) / HZ);
 
 	return 0;
 }
@@ -184,7 +181,7 @@ static int timer8_clock_event_oneshot(struct clock_event_device *ced)
 
 	pr_info("%s: used for oneshot clock events\n", ced->name);
 	timer8_stop(p);
-	timer8_clock_event_start(p, ONESHOT);
+	timer8_clock_event_start(p, 0x10000);
 
 	return 0;
 }
-- 
1.9.1

[PATCH 07/15] clocksource/drivers/h8300_timer8: Fix irq return value check

[Daniel Lezcano]

The value returned in case of error for the 'irq_of_parse_and_map' function is
zero in case of error. Fix the check in the init code.

Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org>
---
 drivers/clocksource/h8300_timer8.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/clocksource/h8300_timer8.c b/drivers/clocksource/h8300_timer8.c
index 2433325..3eedeff 100644
--- a/drivers/clocksource/h8300_timer8.c
+++ b/drivers/clocksource/h8300_timer8.c
@@ -230,7 +230,7 @@ static void __init h8300_8timer_init(struct device_node *node)
 	}
 
 	irq = irq_of_parse_and_map(node, 0);
-	if (irq < 0) {
+	if (!irq) {
 		pr_err("failed to get irq for clockevent\n");
 		goto unmap_reg;
 	}
-- 
1.9.1

[PATCH 08/15] clocksource/drivers/h8300_timer8: Remove pointless irq re-entrant safe code

[Daniel Lezcano]

The current code assumes the interrupt function is re-entrant.

That is not correct. An interrupt handler is never invoked concurrently. The
interrupt line is masked on all processors.

Remove the chewing flags in the code.

Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org>
---
 drivers/clocksource/h8300_timer8.c | 15 ++++++---------
 1 file changed, 6 insertions(+), 9 deletions(-)

diff --git a/drivers/clocksource/h8300_timer8.c b/drivers/clocksource/h8300_timer8.c
index 3eedeff..7111b99 100644
--- a/drivers/clocksource/h8300_timer8.c
+++ b/drivers/clocksource/h8300_timer8.c
@@ -24,8 +24,6 @@
 #define TCORB	6
 #define _8TCNT	8
 
-#define FLAG_SKIPEVENT (1 << 1)
-#define FLAG_IRQCONTEXT (1 << 2)
 #define FLAG_STARTED (1 << 3)
 
 #define SCALE 64
@@ -67,14 +65,13 @@ static irqreturn_t timer8_interrupt(int irq, void *dev_id)
 
 	ctrl_outb(ctrl_inb(p->mapbase + _8TCSR) & ~0x40,
 		  p->mapbase + _8TCSR);
-	p->flags |= FLAG_IRQCONTEXT;
+
 	ctrl_outw(p->tcora, p->mapbase + TCORA);
-	if (!(p->flags & FLAG_SKIPEVENT)) {
-		if (clockevent_state_oneshot(&p->ced))
-			ctrl_outw(0x0000, p->mapbase + _8TCR);
-		p->ced.event_handler(&p->ced);
-	}
-	p->flags &= ~(FLAG_SKIPEVENT | FLAG_IRQCONTEXT);
+
+	if (clockevent_state_oneshot(&p->ced))
+		ctrl_outw(0x0000, p->mapbase + _8TCR);
+
+	p->ced.event_handler(&p->ced);
 
 	return IRQ_HANDLED;
 }
-- 
1.9.1

[PATCH 09/15] clocksource/drivers/h8300_timer8: Remove irq and lock legacy code

[Daniel Lezcano]

The time framawork takes care of disabling the interrupts and takes a lock
to prevent races.

Remove the legacy code in the driver taking care of the races.

Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org>
---
 drivers/clocksource/h8300_timer8.c | 16 ----------------
 1 file changed, 16 deletions(-)

diff --git a/drivers/clocksource/h8300_timer8.c b/drivers/clocksource/h8300_timer8.c
index 7111b99..24d91b1 100644
--- a/drivers/clocksource/h8300_timer8.c
+++ b/drivers/clocksource/h8300_timer8.c
@@ -31,7 +31,6 @@
 struct timer8_priv {
 	struct clock_event_device ced;
 	unsigned long mapbase;
-	raw_spinlock_t lock;
 	unsigned long flags;
 	unsigned int rate;
 	unsigned int tcora;
@@ -78,10 +77,8 @@ static irqreturn_t timer8_interrupt(int irq, void *dev_id)
 
 static void timer8_set_next(struct timer8_priv *p, unsigned long delta)
 {
-	unsigned long flags;
 	unsigned long now;
 
-	raw_spin_lock_irqsave(&p->lock, flags);
 	if (delta >= 0x10000)
 		pr_warn("delta out of range\n");
 	now = timer8_get_counter(p);
@@ -91,8 +88,6 @@ static void timer8_set_next(struct timer8_priv *p, unsigned long delta)
 		ctrl_outw(delta, p->mapbase + TCORA);
 	else
 		ctrl_outw(now + 1, p->mapbase + TCORA);
-
-	raw_spin_unlock_irqrestore(&p->lock, flags);
 }
 
 static int timer8_enable(struct timer8_priv *p)
@@ -108,9 +103,6 @@ static int timer8_enable(struct timer8_priv *p)
 static int timer8_start(struct timer8_priv *p)
 {
 	int ret = 0;
-	unsigned long flags;
-
-	raw_spin_lock_irqsave(&p->lock, flags);
 
 	if (!(p->flags & FLAG_STARTED))
 		ret = timer8_enable(p);
@@ -120,20 +112,12 @@ static int timer8_start(struct timer8_priv *p)
 	p->flags |= FLAG_STARTED;
 
  out:
-	raw_spin_unlock_irqrestore(&p->lock, flags);
-
 	return ret;
 }
 
 static void timer8_stop(struct timer8_priv *p)
 {
-	unsigned long flags;
-
-	raw_spin_lock_irqsave(&p->lock, flags);
-
 	ctrl_outw(0x0000, p->mapbase + _8TCR);
-
-	raw_spin_unlock_irqrestore(&p->lock, flags);
 }
 
 static inline struct timer8_priv *ced_to_priv(struct clock_event_device *ced)
-- 
1.9.1

[PATCH 10/15] clocksource/drivers/h8300_timer8: Retrieve the clock rate at init time

[Daniel Lezcano]

The current code retrieves the rate value when the timer is enabled which
occurs each time a timer is re-armed. Except if the clock frequency has changed
magically I don't see why this should be done each time.

Retrieve the clock rate value at init time only.

Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org>
---
 drivers/clocksource/h8300_timer8.c | 26 ++++++++++++++------------
 1 file changed, 14 insertions(+), 12 deletions(-)

diff --git a/drivers/clocksource/h8300_timer8.c b/drivers/clocksource/h8300_timer8.c
index 24d91b1..187c416 100644
--- a/drivers/clocksource/h8300_timer8.c
+++ b/drivers/clocksource/h8300_timer8.c
@@ -34,7 +34,6 @@ struct timer8_priv {
 	unsigned long flags;
 	unsigned int rate;
 	unsigned int tcora;
-	struct clk *pclk;
 };
 
 static unsigned long timer8_get_counter(struct timer8_priv *p)
@@ -92,7 +91,6 @@ static void timer8_set_next(struct timer8_priv *p, unsigned long delta)
 
 static int timer8_enable(struct timer8_priv *p)
 {
-	p->rate = clk_get_rate(p->pclk) / SCALE;
 	ctrl_outw(0xffff, p->mapbase + TCORA);
 	ctrl_outw(0x0000, p->mapbase + _8TCNT);
 	ctrl_outw(0x0c02, p->mapbase + _8TCR);
@@ -102,16 +100,15 @@ static int timer8_enable(struct timer8_priv *p)
 
 static int timer8_start(struct timer8_priv *p)
 {
-	int ret = 0;
+	int ret;
 
-	if (!(p->flags & FLAG_STARTED))
-		ret = timer8_enable(p);
+	if ((p->flags & FLAG_STARTED))
+		return 0;
 
-	if (ret)
-		goto out;
-	p->flags |= FLAG_STARTED;
+	ret = timer8_enable(p);
+	if (!ret)
+		p->flags |= FLAG_STARTED;
 
- out:
 	return ret;
 }
 
@@ -217,7 +214,12 @@ static void __init h8300_8timer_init(struct device_node *node)
 	}
 
 	timer8_priv.mapbase = (unsigned long)base;
-	timer8_priv.pclk = clk;
+
+	rate = clk_get_rate(clk) / SCALE;
+	if (!rate) {
+		pr_err("Failed to get rate for the clocksource\n");
+		goto unmap_reg;
+	}
 
 	ret = request_irq(irq, timer8_interrupt,
 			  IRQF_TIMER, timer8_priv.ced.name, &timer8_priv);
@@ -225,10 +227,10 @@ static void __init h8300_8timer_init(struct device_node *node)
 		pr_err("failed to request irq %d for clockevent\n", irq);
 		goto unmap_reg;
 	}
-	rate = clk_get_rate(clk) / SCALE;
+
 	clockevents_config_and_register(&timer8_priv.ced, rate, 1, 0x0000ffff);
-	return;
 
+	return;
 unmap_reg:
 	iounmap(base);
 free_clk:
-- 
1.9.1

[PATCH 11/15] clocksource/drivers/h8300_timer16: Remove pointless headers

[Daniel Lezcano]

The headers are not needed, remove them.

Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org>
---
 drivers/clocksource/h8300_timer16.c | 10 ----------
 1 file changed, 10 deletions(-)

diff --git a/drivers/clocksource/h8300_timer16.c b/drivers/clocksource/h8300_timer16.c
index cdf0d83..1c9dd02 100644
--- a/drivers/clocksource/h8300_timer16.c
+++ b/drivers/clocksource/h8300_timer16.c
@@ -4,25 +4,15 @@
  *  Copyright 2015 Yoshinori Sato <ysato@users.sourcefoge.jp>
  */
 
-#include <linux/errno.h>
-#include <linux/kernel.h>
-#include <linux/param.h>
-#include <linux/string.h>
-#include <linux/slab.h>
 #include <linux/interrupt.h>
 #include <linux/init.h>
-#include <linux/platform_device.h>
 #include <linux/clocksource.h>
-#include <linux/module.h>
 #include <linux/clk.h>
 #include <linux/io.h>
 #include <linux/of.h>
 #include <linux/of_address.h>
 #include <linux/of_irq.h>
 
-#include <asm/segment.h>
-#include <asm/irq.h>
-
 #define TSTR	0
 #define TSNC	1
 #define TMDR	2
-- 
1.9.1

[PATCH 12/15] clocksource/drivers/h8300_timer16: Remove unused macros

[Daniel Lezcano]

The macros are no longer used in the code, remove them.

Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org>
---
 drivers/clocksource/h8300_timer16.c | 18 ------------------
 1 file changed, 18 deletions(-)

diff --git a/drivers/clocksource/h8300_timer16.c b/drivers/clocksource/h8300_timer16.c
index 1c9dd02..bc9289b 100644
--- a/drivers/clocksource/h8300_timer16.c
+++ b/drivers/clocksource/h8300_timer16.c
@@ -14,29 +14,11 @@
 #include <linux/of_irq.h>
 
 #define TSTR	0
-#define TSNC	1
-#define TMDR	2
-#define TOLR	3
 #define TISRA	4
-#define TISRB	5
 #define TISRC	6
 
 #define TCR	0
-#define TIOR	1
 #define TCNT	2
-#define GRA	4
-#define GRB	6
-
-#define FLAG_REPROGRAM (1 << 0)
-#define FLAG_SKIPEVENT (1 << 1)
-#define FLAG_IRQCONTEXT (1 << 2)
-#define FLAG_STARTED (1 << 3)
-
-#define ONESHOT  0
-#define PERIODIC 1
-
-#define RELATIVE 0
-#define ABSOLUTE 1
 
 struct timer16_priv {
 	struct clocksource cs;
-- 
1.9.1

[PATCH 13/15] clocksource/drivers/h8300_timer16: Remove unused fields in timer16_priv

[Daniel Lezcano]

The fields are not used in the code, remove them.

Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org>
---
 drivers/clocksource/h8300_timer16.c | 2 --
 1 file changed, 2 deletions(-)

diff --git a/drivers/clocksource/h8300_timer16.c b/drivers/clocksource/h8300_timer16.c
index bc9289b..6705bf7 100644
--- a/drivers/clocksource/h8300_timer16.c
+++ b/drivers/clocksource/h8300_timer16.c
@@ -25,8 +25,6 @@ struct timer16_priv {
 	unsigned long total_cycles;
 	unsigned long mapbase;
 	unsigned long mapcommon;
-	unsigned long flags;
-	unsigned short gra;
 	unsigned short cs_enabled;
 	unsigned char enb;
 	unsigned char imfa;
-- 
1.9.1

[PATCH 14/15] clocksource/drivers/h8300_timer16: Fix irq return value check

[Daniel Lezcano]

The function irq_of_parse_and_map returns zero in case of failure.

Fix the return code test to check against zero.

Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org>
---
 drivers/clocksource/h8300_timer16.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/clocksource/h8300_timer16.c b/drivers/clocksource/h8300_timer16.c
index 6705bf7..129dca0 100644
--- a/drivers/clocksource/h8300_timer16.c
+++ b/drivers/clocksource/h8300_timer16.c
@@ -155,7 +155,7 @@ static void __init h8300_16timer_init(struct device_node *node)
 	}
 
 	irq = irq_of_parse_and_map(node, 0);
-	if (irq < 0) {
+	if (!irq) {
 		pr_err("failed to get irq for clockevent\n");
 		goto unmap_comm;
 	}
-- 
1.9.1

[PATCH 15/15] clocksource/drivers/h8300_timer16: Remove pointless lock

[Daniel Lezcano]

The lock in the timer16_clocksource_read is not needed, remove it.

Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org>
---
 drivers/clocksource/h8300_timer16.c | 6 +-----
 1 file changed, 1 insertion(+), 5 deletions(-)

diff --git a/drivers/clocksource/h8300_timer16.c b/drivers/clocksource/h8300_timer16.c
index 129dca0..f396605 100644
--- a/drivers/clocksource/h8300_timer16.c
+++ b/drivers/clocksource/h8300_timer16.c
@@ -30,7 +30,6 @@ struct timer16_priv {
 	unsigned char imfa;
 	unsigned char imiea;
 	unsigned char ovf;
-	raw_spinlock_t lock;
 	struct clk *clk;
 };
 
@@ -75,13 +74,10 @@ static inline struct timer16_priv *cs_to_priv(struct clocksource *cs)
 static cycle_t timer16_clocksource_read(struct clocksource *cs)
 {
 	struct timer16_priv *p = cs_to_priv(cs);
-	unsigned long flags, raw;
-	unsigned long value;
+	unsigned long raw, value;
 
-	raw_spin_lock_irqsave(&p->lock, flags);
 	value = p->total_cycles;
 	raw = timer16_get_counter(p);
-	raw_spin_unlock_irqrestore(&p->lock, flags);
 
 	return value + raw;
 }
-- 
1.9.1

Re: [PATCH 01/15] clocksource/drivers/h8300_timer8: Fix compilation error with dev_warn

[Daniel Lezcano]

Series compiled but not tested.

   -- Daniel


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[PATCH 0/4] h8300: clock driver update

[Yoshinori Sato]

Overall looks good.
And I found some problem (in original code). This patches fix it.
Please apply after your patches.

Thanks.

Yoshinori Sato (4):
  h8300: clocksource: Use overflow interrupt
  h8300: clocksource: Counter overflow fix
  h8300: clocksource: More simplify timer8_set_next
  h8300: clocksource: remove unused local-variable.

 drivers/clocksource/h8300_timer16.c | 30 ++++++++++--------
 drivers/clocksource/h8300_timer8.c  | 63 ++++++++++++-------------------------
 2 files changed, 37 insertions(+), 56 deletions(-)

-- 
2.6.1

[PATCH 1/4] h8300: clocksource: Use overflow interrupt

[Yoshinori Sato]

Overflow interrupt is used for moving up of a count.

Signed-off-by: Yoshinori Sato <ysato@users.sourceforge.jp>
---
 drivers/clocksource/h8300_timer16.c | 20 +++++++++++---------
 1 file changed, 11 insertions(+), 9 deletions(-)

diff --git a/drivers/clocksource/h8300_timer16.c b/drivers/clocksource/h8300_timer16.c
index f396605..53daf6a 100644
--- a/drivers/clocksource/h8300_timer16.c
+++ b/drivers/clocksource/h8300_timer16.c
@@ -14,7 +14,6 @@
 #include <linux/of_irq.h>
 
 #define TSTR	0
-#define TISRA	4
 #define TISRC	6
 
 #define TCR	0
@@ -27,10 +26,8 @@ struct timer16_priv {
 	unsigned long mapcommon;
 	unsigned short cs_enabled;
 	unsigned char enb;
-	unsigned char imfa;
-	unsigned char imiea;
 	unsigned char ovf;
-	struct clk *clk;
+	unsigned char ovie;
 };
 
 static unsigned long timer16_get_counter(struct timer16_priv *p)
@@ -59,8 +56,8 @@ static irqreturn_t timer16_interrupt(int irq, void *dev_id)
 {
 	struct timer16_priv *p = (struct timer16_priv *)dev_id;
 
-	ctrl_outb(ctrl_inb(p->mapcommon + TISRA) & ~p->imfa,
-		  p->mapcommon + TISRA);
+	ctrl_outb(ctrl_inb(p->mapcommon + TISRC) & ~p->ovf,
+		  p->mapcommon + TISRC);
 	p->total_cycles += 0x10000;
 
 	return IRQ_HANDLED;
@@ -91,6 +88,8 @@ static int timer16_enable(struct clocksource *cs)
 	p->total_cycles = 0;
 	ctrl_outw(0x0000, p->mapbase + TCNT);
 	ctrl_outb(0x83, p->mapbase + TCR);
+	ctrl_outb(ctrl_inb(p->mapcommon + TISRC) | p->ovie,
+		  p->mapcommon + TISRC);
 	ctrl_outb(ctrl_inb(p->mapcommon + TSTR) | p->enb,
 		  p->mapcommon + TSTR);
 
@@ -104,6 +103,8 @@ static void timer16_disable(struct clocksource *cs)
 
 	WARN_ON(!p->cs_enabled);
 
+	ctrl_outb(ctrl_inb(p->mapcommon + TISRC) & ~p->ovie,
+		  p->mapcommon + TISRC);
 	ctrl_outb(ctrl_inb(p->mapcommon + TSTR) & ~p->enb,
 		  p->mapcommon + TSTR);
 
@@ -118,6 +119,7 @@ static struct timer16_priv timer16_priv = {
 		.enable = timer16_enable,
 		.disable = timer16_disable,
 		.mask = CLOCKSOURCE_MASK(sizeof(unsigned long) * 8),
+		.max_cycles = 0xffffffff,
 		.flags = CLOCK_SOURCE_IS_CONTINUOUS,
 	},
 };
@@ -160,9 +162,9 @@ static void __init h8300_16timer_init(struct device_node *node)
 
 	timer16_priv.mapbase = (unsigned long)base[REG_CH];
 	timer16_priv.mapcommon = (unsigned long)base[REG_COMM];
+	timer16_priv.ovf = 1 << ch;
+	timer16_priv.ovie = 1 << (4 + ch);
 	timer16_priv.enb = 1 << ch;
-	timer16_priv.imfa = 1 << ch;
-	timer16_priv.imiea = 1 << (4 + ch);
 
 	ret = request_irq(irq, timer16_interrupt,
 			  IRQF_TIMER, timer16_priv.cs.name, &timer16_priv);
@@ -172,7 +174,7 @@ static void __init h8300_16timer_init(struct device_node *node)
 	}
 
 	clocksource_register_hz(&timer16_priv.cs,
-				clk_get_rate(timer16_priv.clk) / 8);
+				clk_get_rate(clk) / 8);
 	return;
 
 unmap_comm:
-- 
2.6.1

Re: [PATCH 1/4] h8300: clocksource: Use overflow interrupt

[Daniel Lezcano]

On 11/11/2015 03:50 PM, Yoshinori Sato wrote:
> Overflow interrupt is used for moving up of a count.
>
> Signed-off-by: Yoshinori Sato <ysato@users.sourceforge.jp>
> ---

[ ... ]

> @@ -118,6 +119,7 @@ static struct timer16_priv timer16_priv = {
>   		.enable = timer16_enable,
>   		.disable = timer16_disable,
>   		.mask = CLOCKSOURCE_MASK(sizeof(unsigned long) * 8),
> +		.max_cycles = 0xffffffff,

This is computed automatically when registering the clocksource.

clocksource_register_hz
   __clocksource_register_scale
     __clocksource_update_freq_scale
	clocksource_update_max_deferment
=>            clocks_calc_max_nsecs


>   		.flags = CLOCK_SOURCE_IS_CONTINUOUS,
>   	},
>   };

[ ... ]

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[PATCH 2/4] h8300: clocksource: Counter overflow fix

[Yoshinori Sato]

Signed-off-by: Yoshinori Sato <ysato@users.sourceforge.jp>
---
 drivers/clocksource/h8300_timer16.c | 10 ++++++----
 1 file changed, 6 insertions(+), 4 deletions(-)

diff --git a/drivers/clocksource/h8300_timer16.c b/drivers/clocksource/h8300_timer16.c
index 53daf6a..639acf3 100644
--- a/drivers/clocksource/h8300_timer16.c
+++ b/drivers/clocksource/h8300_timer16.c
@@ -32,8 +32,8 @@ struct timer16_priv {
 
 static unsigned long timer16_get_counter(struct timer16_priv *p)
 {
-	unsigned long v1, v2, v3;
-	int o1, o2;
+	unsigned short v1, v2, v3;
+	unsigned char o1, o2;
 
 	o1 = ctrl_inb(p->mapcommon + TISRC) & p->ovf;
 
@@ -47,8 +47,10 @@ static unsigned long timer16_get_counter(struct timer16_priv *p)
 	} while (unlikely((o1 != o2) || (v1 > v2 && v1 < v3)
 			  || (v2 > v3 && v2 < v1) || (v3 > v1 && v3 < v2)));
 
-	v2 |= 0x10000;
-	return v2;
+	if (unlikely(!o1))
+		return v2;
+	else
+		return v2 + 0x10000;
 }
 
 
-- 
2.6.1

[PATCH 3/4] h8300: clocksource: More simplify timer8_set_next

[Yoshinori Sato]

Signed-off-by: Yoshinori Sato <ysato@users.sourceforge.jp>
---
 drivers/clocksource/h8300_timer8.c | 48 +++++++++++---------------------------
 1 file changed, 13 insertions(+), 35 deletions(-)

diff --git a/drivers/clocksource/h8300_timer8.c b/drivers/clocksource/h8300_timer8.c
index 187c416..d85ae9a 100644
--- a/drivers/clocksource/h8300_timer8.c
+++ b/drivers/clocksource/h8300_timer8.c
@@ -24,6 +24,9 @@
 #define TCORB	6
 #define _8TCNT	8
 
+#define CMIEA	BIT(6)
+#define CMFA	BIT(6)
+
 #define FLAG_STARTED (1 << 3)
 
 #define SCALE 64
@@ -36,57 +39,32 @@ struct timer8_priv {
 	unsigned int tcora;
 };
 
-static unsigned long timer8_get_counter(struct timer8_priv *p)
-{
-	unsigned long v1, v2, v3;
-	int o1, o2;
-
-	o1 = ctrl_inb(p->mapbase + _8TCSR) & 0x20;
-
-	/* Make sure the timer value is stable. Stolen from acpi_pm.c */
-	do {
-		o2 = o1;
-		v1 = ctrl_inw(p->mapbase + _8TCNT);
-		v2 = ctrl_inw(p->mapbase + _8TCNT);
-		v3 = ctrl_inw(p->mapbase + _8TCNT);
-		o1 = ctrl_inb(p->mapbase + _8TCSR) & 0x20;
-	} while (unlikely((o1 != o2) || (v1 > v2 && v1 < v3)
-			  || (v2 > v3 && v2 < v1) || (v3 > v1 && v3 < v2)));
-
-	v2 |= o1 << 10;
-	return v2;
-}
-
 static irqreturn_t timer8_interrupt(int irq, void *dev_id)
 {
 	struct timer8_priv *p = dev_id;
 
-	ctrl_outb(ctrl_inb(p->mapbase + _8TCSR) & ~0x40,
-		  p->mapbase + _8TCSR);
-
-	ctrl_outw(p->tcora, p->mapbase + TCORA);
-
 	if (clockevent_state_oneshot(&p->ced))
 		ctrl_outw(0x0000, p->mapbase + _8TCR);
 
 	p->ced.event_handler(&p->ced);
 
+	ctrl_outb(ctrl_inb(p->mapbase + _8TCSR) & ~CMFA,
+		  p->mapbase + _8TCSR);
 	return IRQ_HANDLED;
 }
 
 static void timer8_set_next(struct timer8_priv *p, unsigned long delta)
 {
-	unsigned long now;
-
 	if (delta >= 0x10000)
 		pr_warn("delta out of range\n");
-	now = timer8_get_counter(p);
-	p->tcora = delta;
-	ctrl_outb(ctrl_inb(p->mapbase + _8TCR) | 0x40, p->mapbase + _8TCR);
-	if (delta > now)
-		ctrl_outw(delta, p->mapbase + TCORA);
-	else
-		ctrl_outw(now + 1, p->mapbase + TCORA);
+	ctrl_outb(ctrl_inb(p->mapbase + _8TCR) & ~CMIEA,
+		  p->mapbase + _8TCR);
+	ctrl_outw(delta, p->mapbase + TCORA);
+	ctrl_outw(0x0000, p->mapbase + _8TCNT);
+	ctrl_outb(ctrl_inb(p->mapbase + _8TCSR) & ~CMFA,
+		  p->mapbase + _8TCSR);
+	ctrl_outb(ctrl_inb(p->mapbase + _8TCR) | CMIEA,
+		  p->mapbase + _8TCR);
 }
 
 static int timer8_enable(struct timer8_priv *p)
-- 
2.6.1

[PATCH 4/4] h8300: clocksource: remove unused local-variable.

[Yoshinori Sato]

Signed-off-by: Yoshinori Sato <ysato@users.sourceforge.jp>
---
 drivers/clocksource/h8300_timer8.c | 15 +++++++--------
 1 file changed, 7 insertions(+), 8 deletions(-)

diff --git a/drivers/clocksource/h8300_timer8.c b/drivers/clocksource/h8300_timer8.c
index d85ae9a..a725758 100644
--- a/drivers/clocksource/h8300_timer8.c
+++ b/drivers/clocksource/h8300_timer8.c
@@ -169,8 +169,6 @@ static void __init h8300_8timer_init(struct device_node *node)
 {
 	void __iomem *base;
 	int irq;
-	int ret = 0;
-	int rate;
 	struct clk *clk;
 
 	clk = of_clk_get(node, 0);
@@ -193,20 +191,21 @@ static void __init h8300_8timer_init(struct device_node *node)
 
 	timer8_priv.mapbase = (unsigned long)base;
 
-	rate = clk_get_rate(clk) / SCALE;
-	if (!rate) {
+	timer8_priv.rate = clk_get_rate(clk);
+	if (!timer8_priv.rate) {
 		pr_err("Failed to get rate for the clocksource\n");
 		goto unmap_reg;
 	}
+	timer8_priv.rate /= SCALE;
 
-	ret = request_irq(irq, timer8_interrupt,
-			  IRQF_TIMER, timer8_priv.ced.name, &timer8_priv);
-	if (ret < 0) {
+	if (request_irq(irq, timer8_interrupt,
+			IRQF_TIMER, timer8_priv.ced.name, &timer8_priv) < 0) {
 		pr_err("failed to request irq %d for clockevent\n", irq);
 		goto unmap_reg;
 	}
 
-	clockevents_config_and_register(&timer8_priv.ced, rate, 1, 0x0000ffff);
+	clockevents_config_and_register(&timer8_priv.ced,
+					timer8_priv.rate, 1, 0x0000ffff);
 
 	return;
 unmap_reg:
-- 
2.6.1

Re: [PATCH 0/4] h8300: clock driver update

[Daniel Lezcano]

On 11/11/2015 03:50 PM, Yoshinori Sato wrote:
> Overall looks good.
> And I found some problem (in original code). This patches fix it.
> Please apply after your patches.


Hi Yoshinori,

could you add a better description in your patches. No need to resend, 
just answer to the patches with the changelog.

Thanks !

   -- Daniel


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Re: [PATCH 0/4] h8300: clock driver update

[Daniel Lezcano]

On 11/11/2015 03:50 PM, Yoshinori Sato wrote:
> Overall looks good.
> And I found some problem (in original code). This patches fix it.
> Please apply after your patches.

Hi Yoshinori,

could you elaborate in the changelogs of the different patches what they 
do ?

Thanks
   -- Daniel

> Yoshinori Sato (4):
>    h8300: clocksource: Use overflow interrupt
>    h8300: clocksource: Counter overflow fix
>    h8300: clocksource: More simplify timer8_set_next
>    h8300: clocksource: remove unused local-variable.
>
>   drivers/clocksource/h8300_timer16.c | 30 ++++++++++--------
>   drivers/clocksource/h8300_timer8.c  | 63 ++++++++++++-------------------------
>   2 files changed, 37 insertions(+), 56 deletions(-)
>


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Re: [PATCH 0/4] h8300: clock driver update

[Yoshinori Sato]

On Tue, 17 Nov 2015 21:20:45 +0900,
Daniel Lezcano wrote:
> 
> On 11/11/2015 03:50 PM, Yoshinori Sato wrote:
> > Overall looks good.
> > And I found some problem (in original code). This patches fix it.
> > Please apply after your patches.
> 
> Hi Yoshinori,
> 
> could you elaborate in the changelogs of the different patches what
> they do ?
> 
> Thanks
>   -- Daniel
>

I found one problem.
I will resend after fix it.

Thanks.

> > Yoshinori Sato (4):
> >    h8300: clocksource: Use overflow interrupt
> >    h8300: clocksource: Counter overflow fix
> >    h8300: clocksource: More simplify timer8_set_next
> >    h8300: clocksource: remove unused local-variable.
> > 
> >   drivers/clocksource/h8300_timer16.c | 30 ++++++++++--------
> >   drivers/clocksource/h8300_timer8.c  | 63 ++++++++++++-------------------------
> >   2 files changed, 37 insertions(+), 56 deletions(-)
> > 
> 
> 
> -- 
>  <http://www.linaro.org/> Linaro.org │ Open source software for ARM SoCs
> 
> Follow Linaro:  <http://www.facebook.com/pages/Linaro> Facebook |
> <http://twitter.com/#!/linaroorg> Twitter |
> <http://www.linaro.org/linaro-blog/> Blog
> 
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-- 
Yoshinori Sato
<ysato@users.sourceforge.jp>