clocksource: sh_cmt clocksource support

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@igel.co.jp>
Signed-off-by: Paul Mundt <lethal@linux-sh.org>

1 files changed, 66 insertions, 0 deletions

diff --git a/drivers/clocksource/sh_cmt.c b/drivers/clocksource/sh_cmt.c
index 02bae3994abe..c24756489612 100644
--- a/drivers/clocksource/sh_cmt.c
+++ b/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_priv *p, unsigned long flag)
         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 *p, char *name,
         if (clockevent_rating)
                 sh_cmt_register_clockevent(p, name, clockevent_rating);
 
+        if (clocksource_rating)
+                sh_cmt_register_clocksource(p, name, clocksource_rating);
+
         return 0;
 }