The patch titled
clocksource: sh_cmt clocksource support
has been removed from the -mm tree. Its filename was
clocksource-sh_cmt-clocksource-support.patch
This patch was dropped because it was merged into mainline or a subsystem tree
The current -mm tree may be found at http://userweb.kernel.org/~akpm/mmotm/
------------------------------------------------------
Subject: clocksource: sh_cmt clocksource support
From: Magnus Damm <damm@xxxxxxxxxx>
Add clocksource support to the sh_cmt driver. With this in
place we can do tickless with a single CMT channel.
Signed-off-by: Magnus Damm <damm@xxxxxxxxxx>
Cc: John Stultz <johnstul@xxxxxxxxxx>
Cc: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
Cc: Ingo Molnar <mingo@xxxxxxx>
Cc: Paul Mundt <lethal@xxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
drivers/clocksource/sh_cmt.c | 66 +++++++++++++++++++++++++++++++++
1 file changed, 66 insertions(+)
diff -puN drivers/clocksource/sh_cmt.c~clocksource-sh_cmt-clocksource-support drivers/clocksource/sh_cmt.c
--- a/drivers/clocksource/sh_cmt.c~clocksource-sh_cmt-clocksource-support
+++ a/drivers/clocksource/sh_cmt.c
@@ -47,6 +47,7 @@ struct sh_cmt_priv {
unsigned long rate;
spinlock_t lock;
struct clock_event_device ced;
+ struct clocksource cs;
unsigned long total_cycles;
};
@@ -376,6 +377,68 @@ static void sh_cmt_stop(struct sh_cmt_pr
spin_unlock_irqrestore(&p->lock, flags);
}
+static struct sh_cmt_priv *cs_to_sh_cmt(struct clocksource *cs)
+{
+ return container_of(cs, struct sh_cmt_priv, cs);
+}
+
+static cycle_t sh_cmt_clocksource_read(struct clocksource *cs)
+{
+ struct sh_cmt_priv *p = cs_to_sh_cmt(cs);
+ unsigned long flags, raw;
+ unsigned long value;
+ int has_wrapped;
+
+ spin_lock_irqsave(&p->lock, flags);
+ value = p->total_cycles;
+ raw = sh_cmt_get_counter(p, &has_wrapped);
+
+ if (unlikely(has_wrapped))
+ raw = p->match_value;
+ spin_unlock_irqrestore(&p->lock, flags);
+
+ return value + raw;
+}
+
+static int sh_cmt_clocksource_enable(struct clocksource *cs)
+{
+ struct sh_cmt_priv *p = cs_to_sh_cmt(cs);
+ int ret;
+
+ p->total_cycles = 0;
+
+ ret = sh_cmt_start(p, FLAG_CLOCKSOURCE);
+ if (ret)
+ return ret;
+
+ /* TODO: calculate good shift from rate and counter bit width */
+ cs->shift = 0;
+ cs->mult = clocksource_hz2mult(p->rate, cs->shift);
+ return 0;
+}
+
+static void sh_cmt_clocksource_disable(struct clocksource *cs)
+{
+ sh_cmt_stop(cs_to_sh_cmt(cs), FLAG_CLOCKSOURCE);
+}
+
+static int sh_cmt_register_clocksource(struct sh_cmt_priv *p,
+ char *name, unsigned long rating)
+{
+ struct clocksource *cs = &p->cs;
+
+ cs->name = name;
+ cs->rating = rating;
+ cs->read = sh_cmt_clocksource_read;
+ cs->enable = sh_cmt_clocksource_enable;
+ cs->disable = sh_cmt_clocksource_disable;
+ cs->mask = CLOCKSOURCE_MASK(sizeof(unsigned long) * 8);
+ cs->flags = CLOCK_SOURCE_IS_CONTINUOUS;
+ pr_info("sh_cmt: %s used as clock source\n", cs->name);
+ clocksource_register(cs);
+ return 0;
+}
+
static struct sh_cmt_priv *ced_to_sh_cmt(struct clock_event_device *ced)
{
return container_of(ced, struct sh_cmt_priv, ced);
@@ -483,6 +546,9 @@ int sh_cmt_register(struct sh_cmt_priv *
if (clockevent_rating)
sh_cmt_register_clockevent(p, name, clockevent_rating);
+ if (clocksource_rating)
+ sh_cmt_register_clocksource(p, name, clocksource_rating);
+
return 0;
}
_
Patches currently in -mm which might be from damm@xxxxxxxxxx are
linux-next.patch
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