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authorAlexandre Belloni <alexandre.belloni@free-electrons.com>2015-08-16 11:23:44 +0200
committerAlexandre Belloni <alexandre.belloni@free-electrons.com>2015-10-06 12:25:11 +0200
commit216ab8f155fba659e06df240862cf59acb8b7be5 (patch)
tree96de6aef0c2f144f8719054c177656b685e1241f /drivers/clocksource
parent6ff33f3902c3b1c5d0db6b1e2c70b6d76fba357f (diff)
clocksource: atmel-st: get and use slow clock
The current slow clock rate is hardcoded. Properly get the slow clock and use its rate. Signed-off-by: Alexandre Belloni <alexandre.belloni@free-electrons.com> Acked-by: Daniel Lezcano <daniel.lezcano@linaro.org>
Diffstat (limited to 'drivers/clocksource')
-rw-r--r--drivers/clocksource/timer-atmel-st.c31
1 files changed, 22 insertions, 9 deletions
diff --git a/drivers/clocksource/timer-atmel-st.c b/drivers/clocksource/timer-atmel-st.c
index 41b7b6dc1d0d..29d21d68df5a 100644
--- a/drivers/clocksource/timer-atmel-st.c
+++ b/drivers/clocksource/timer-atmel-st.c
@@ -22,6 +22,7 @@
#include <linux/kernel.h>
#include <linux/interrupt.h>
#include <linux/irq.h>
+#include <linux/clk.h>
#include <linux/clockchips.h>
#include <linux/export.h>
#include <linux/mfd/syscon.h>
@@ -33,9 +34,7 @@ static unsigned long last_crtr;
static u32 irqmask;
static struct clock_event_device clkevt;
static struct regmap *regmap_st;
-
-#define AT91_SLOW_CLOCK 32768
-#define RM9200_TIMER_LATCH ((AT91_SLOW_CLOCK + HZ/2) / HZ)
+static int timer_latch;
/*
* The ST_CRTR is updated asynchronously to the master clock ... but
@@ -82,8 +81,8 @@ static irqreturn_t at91rm9200_timer_interrupt(int irq, void *dev_id)
if (sr & AT91_ST_PITS) {
u32 crtr = read_CRTR();
- while (((crtr - last_crtr) & AT91_ST_CRTV) >= RM9200_TIMER_LATCH) {
- last_crtr += RM9200_TIMER_LATCH;
+ while (((crtr - last_crtr) & AT91_ST_CRTV) >= timer_latch) {
+ last_crtr += timer_latch;
clkevt.event_handler(&clkevt);
}
return IRQ_HANDLED;
@@ -144,7 +143,7 @@ static int clkevt32k_set_periodic(struct clock_event_device *dev)
/* PIT for periodic irqs; fixed rate of 1/HZ */
irqmask = AT91_ST_PITS;
- regmap_write(regmap_st, AT91_ST_PIMR, RM9200_TIMER_LATCH);
+ regmap_write(regmap_st, AT91_ST_PIMR, timer_latch);
regmap_write(regmap_st, AT91_ST_IER, irqmask);
return 0;
}
@@ -197,7 +196,8 @@ static struct clock_event_device clkevt = {
*/
static void __init atmel_st_timer_init(struct device_node *node)
{
- unsigned int val;
+ struct clk *sclk;
+ unsigned int sclk_rate, val;
int irq, ret;
regmap_st = syscon_node_to_regmap(node);
@@ -221,6 +221,19 @@ static void __init atmel_st_timer_init(struct device_node *node)
if (ret)
panic(pr_fmt("Unable to setup IRQ\n"));
+ sclk = of_clk_get(node, 0);
+ if (IS_ERR(sclk))
+ panic(pr_fmt("Unable to get slow clock\n"));
+
+ clk_prepare_enable(sclk);
+ if (ret)
+ panic(pr_fmt("Could not enable slow clock\n"));
+
+ sclk_rate = clk_get_rate(sclk);
+ if (!sclk_rate)
+ panic(pr_fmt("Invalid slow clock rate\n"));
+ timer_latch = (sclk_rate + HZ / 2) / HZ;
+
/* The 32KiHz "Slow Clock" (tick every 30517.58 nanoseconds) is used
* directly for the clocksource and all clockevents, after adjusting
* its prescaler from the 1 Hz default.
@@ -229,11 +242,11 @@ static void __init atmel_st_timer_init(struct device_node *node)
/* Setup timer clockevent, with minimum of two ticks (important!!) */
clkevt.cpumask = cpumask_of(0);
- clockevents_config_and_register(&clkevt, AT91_SLOW_CLOCK,
+ clockevents_config_and_register(&clkevt, sclk_rate,
2, AT91_ST_ALMV);
/* register clocksource */
- clocksource_register_hz(&clk32k, AT91_SLOW_CLOCK);
+ clocksource_register_hz(&clk32k, sclk_rate);
}
CLOCKSOURCE_OF_DECLARE(atmel_st_timer, "atmel,at91rm9200-st",
atmel_st_timer_init);