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Diffstat (limited to 'arch/arm/common/timer-sp.c')
-rw-r--r--arch/arm/common/timer-sp.c82
1 files changed, 51 insertions, 31 deletions
diff --git a/arch/arm/common/timer-sp.c b/arch/arm/common/timer-sp.c
index 6ef3342153b..41df4787512 100644
--- a/arch/arm/common/timer-sp.c
+++ b/arch/arm/common/timer-sp.c
@@ -18,53 +18,67 @@
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
+#include <linux/clk.h>
#include <linux/clocksource.h>
#include <linux/clockchips.h>
+#include <linux/err.h>
#include <linux/interrupt.h>
#include <linux/irq.h>
#include <linux/io.h>
#include <asm/hardware/arm_timer.h>
-/*
- * These timers are currently always setup to be clocked at 1MHz.
- */
-#define TIMER_FREQ_KHZ (1000)
-#define TIMER_RELOAD (TIMER_FREQ_KHZ * 1000 / HZ)
+static long __init sp804_get_clock_rate(const char *name)
+{
+ struct clk *clk;
+ long rate;
+ int err;
+
+ clk = clk_get_sys("sp804", name);
+ if (IS_ERR(clk)) {
+ pr_err("sp804: %s clock not found: %d\n", name,
+ (int)PTR_ERR(clk));
+ return PTR_ERR(clk);
+ }
-static void __iomem *clksrc_base;
+ err = clk_enable(clk);
+ if (err) {
+ pr_err("sp804: %s clock failed to enable: %d\n", name, err);
+ clk_put(clk);
+ return err;
+ }
-static cycle_t sp804_read(struct clocksource *cs)
-{
- return ~readl(clksrc_base + TIMER_VALUE);
-}
+ rate = clk_get_rate(clk);
+ if (rate < 0) {
+ pr_err("sp804: %s clock failed to get rate: %ld\n", name, rate);
+ clk_disable(clk);
+ clk_put(clk);
+ }
-static struct clocksource clocksource_sp804 = {
- .name = "timer3",
- .rating = 200,
- .read = sp804_read,
- .mask = CLOCKSOURCE_MASK(32),
- .flags = CLOCK_SOURCE_IS_CONTINUOUS,
-};
+ return rate;
+}
-void __init sp804_clocksource_init(void __iomem *base)
+void __init sp804_clocksource_init(void __iomem *base, const char *name)
{
- struct clocksource *cs = &clocksource_sp804;
+ long rate = sp804_get_clock_rate(name);
- clksrc_base = base;
+ if (rate < 0)
+ return;
/* setup timer 0 as free-running clocksource */
- writel(0, clksrc_base + TIMER_CTRL);
- writel(0xffffffff, clksrc_base + TIMER_LOAD);
- writel(0xffffffff, clksrc_base + TIMER_VALUE);
+ writel(0, base + TIMER_CTRL);
+ writel(0xffffffff, base + TIMER_LOAD);
+ writel(0xffffffff, base + TIMER_VALUE);
writel(TIMER_CTRL_32BIT | TIMER_CTRL_ENABLE | TIMER_CTRL_PERIODIC,
- clksrc_base + TIMER_CTRL);
+ base + TIMER_CTRL);
- clocksource_register_khz(cs, TIMER_FREQ_KHZ);
+ clocksource_mmio_init(base + TIMER_VALUE, name,
+ rate, 200, 32, clocksource_mmio_readl_down);
}
static void __iomem *clkevt_base;
+static unsigned long clkevt_reload;
/*
* IRQ handler for the timer
@@ -90,7 +104,7 @@ static void sp804_set_mode(enum clock_event_mode mode,
switch (mode) {
case CLOCK_EVT_MODE_PERIODIC:
- writel(TIMER_RELOAD, clkevt_base + TIMER_LOAD);
+ writel(clkevt_reload, clkevt_base + TIMER_LOAD);
ctrl |= TIMER_CTRL_PERIODIC | TIMER_CTRL_ENABLE;
break;
@@ -120,7 +134,6 @@ static int sp804_set_next_event(unsigned long next,
}
static struct clock_event_device sp804_clockevent = {
- .name = "timer0",
.shift = 32,
.features = CLOCK_EVT_FEAT_PERIODIC | CLOCK_EVT_FEAT_ONESHOT,
.set_mode = sp804_set_mode,
@@ -136,17 +149,24 @@ static struct irqaction sp804_timer_irq = {
.dev_id = &sp804_clockevent,
};
-void __init sp804_clockevents_init(void __iomem *base, unsigned int timer_irq)
+void __init sp804_clockevents_init(void __iomem *base, unsigned int irq,
+ const char *name)
{
struct clock_event_device *evt = &sp804_clockevent;
+ long rate = sp804_get_clock_rate(name);
+
+ if (rate < 0)
+ return;
clkevt_base = base;
+ clkevt_reload = DIV_ROUND_CLOSEST(rate, HZ);
- evt->irq = timer_irq;
- evt->mult = div_sc(TIMER_FREQ_KHZ, NSEC_PER_MSEC, evt->shift);
+ evt->name = name;
+ evt->irq = irq;
+ evt->mult = div_sc(rate, NSEC_PER_SEC, evt->shift);
evt->max_delta_ns = clockevent_delta2ns(0xffffffff, evt);
evt->min_delta_ns = clockevent_delta2ns(0xf, evt);
- setup_irq(timer_irq, &sp804_timer_irq);
+ setup_irq(irq, &sp804_timer_irq);
clockevents_register_device(evt);
}