diff options
| author | Yoshinori Sato <ysato@users.sourceforge.jp> | 2015-12-04 18:48:16 +0100 |
|---|---|---|
| committer | Daniel Lezcano <daniel.lezcano@linaro.org> | 2015-12-16 11:33:33 +0100 |
| commit | f37632d1e9ff8445e0d1ea761f4ce7b98e059d75 (patch) | |
| tree | b6f89e340f18dc9ce734a21ad82ed914f0c874b7 /drivers/clocksource | |
| parent | clocksource/drivers/h8300: Fix timer not overflow case (diff) | |
| download | linux-f37632d1e9ff8445e0d1ea761f4ce7b98e059d75.tar.xz linux-f37632d1e9ff8445e0d1ea761f4ce7b98e059d75.zip | |
clocksource/drivers/h8300: Simplify delta handling
Signed-off-by: Yoshinori Sato <ysato@users.sourceforge.jp>
Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org>
Diffstat (limited to 'drivers/clocksource')
| -rw-r--r-- | drivers/clocksource/h8300_timer8.c | 40 |
1 files changed, 6 insertions, 34 deletions
diff --git a/drivers/clocksource/h8300_timer8.c b/drivers/clocksource/h8300_timer8.c index aa4b2a989747..1ba453b47478 100644 --- a/drivers/clocksource/h8300_timer8.c +++ b/drivers/clocksource/h8300_timer8.c @@ -36,57 +36,29 @@ 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 = readb(p->mapbase + _8TCSR) & 0x20; - - /* Make sure the timer value is stable. Stolen from acpi_pm.c */ - do { - o2 = o1; - v1 = readw(p->mapbase + _8TCNT); - v2 = readw(p->mapbase + _8TCNT); - v3 = readw(p->mapbase + _8TCNT); - o1 = readb(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; - writeb(readb(p->mapbase + _8TCSR) & ~0x40, - p->mapbase + _8TCSR); - - writew(p->tcora, p->mapbase + TCORA); - if (clockevent_state_oneshot(&p->ced)) writew(0x0000, p->mapbase + _8TCR); p->ced.event_handler(&p->ced); + writeb(readb(p->mapbase + _8TCSR) & ~0x40, + 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; + writeb(readb(p->mapbase + _8TCR) & ~0x40, p->mapbase + _8TCR); + writew(0, p->mapbase + _8TCNT); + writew(delta, p->mapbase + TCORA); writeb(readb(p->mapbase + _8TCR) | 0x40, p->mapbase + _8TCR); - if (delta > now) - writew(delta, p->mapbase + TCORA); - else - writew(now + 1, p->mapbase + TCORA); } static int timer8_enable(struct timer8_priv *p) |