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Diffstat (limited to 'arch/microblaze/kernel/timer.c')
-rw-r--r--arch/microblaze/kernel/timer.c51
1 files changed, 28 insertions, 23 deletions
diff --git a/arch/microblaze/kernel/timer.c b/arch/microblaze/kernel/timer.c
index 3e39b1082fdf..fb0c61443f19 100644
--- a/arch/microblaze/kernel/timer.c
+++ b/arch/microblaze/kernel/timer.c
@@ -12,12 +12,12 @@
#include <linux/interrupt.h>
#include <linux/delay.h>
#include <linux/sched.h>
+#include <linux/sched_clock.h>
#include <linux/clk.h>
#include <linux/clockchips.h>
#include <linux/of_address.h>
#include <linux/of_irq.h>
#include <asm/cpuinfo.h>
-#include <linux/cnt32_to_63.h>
static void __iomem *timer_baseaddr;
@@ -167,10 +167,15 @@ static __init void xilinx_clockevent_init(void)
clockevents_register_device(&clockevent_xilinx_timer);
}
+static u64 xilinx_clock_read(void)
+{
+ return in_be32(timer_baseaddr + TCR1);
+}
+
static cycle_t xilinx_read(struct clocksource *cs)
{
/* reading actual value of timer 1 */
- return (cycle_t) (in_be32(timer_baseaddr + TCR1));
+ return (cycle_t)xilinx_clock_read();
}
static struct timecounter xilinx_tc = {
@@ -222,17 +227,17 @@ static int __init xilinx_clocksource_init(void)
return 0;
}
-/*
- * We have to protect accesses before timer initialization
- * and return 0 for sched_clock function below.
- */
-static int timer_initialized;
-
static void __init xilinx_timer_init(struct device_node *timer)
{
+ struct clk *clk;
+ static int initialized;
u32 irq;
u32 timer_num = 1;
- int ret;
+
+ if (initialized)
+ return;
+
+ initialized = 1;
timer_baseaddr = of_iomap(timer, 0);
if (!timer_baseaddr) {
@@ -250,10 +255,20 @@ static void __init xilinx_timer_init(struct device_node *timer)
pr_info("%s: irq=%d\n", timer->full_name, irq);
- /* If there is clock-frequency property than use it */
- ret = of_property_read_u32(timer, "clock-frequency", &timer_clock_freq);
- if (ret < 0)
+ clk = of_clk_get(timer, 0);
+ if (IS_ERR(clk)) {
+ pr_err("ERROR: timer CCF input clock not found\n");
+ /* If there is clock-frequency property than use it */
+ of_property_read_u32(timer, "clock-frequency",
+ &timer_clock_freq);
+ } else {
+ timer_clock_freq = clk_get_rate(clk);
+ }
+
+ if (!timer_clock_freq) {
+ pr_err("ERROR: Using CPU clock frequency\n");
timer_clock_freq = cpuinfo.cpu_clock_freq;
+ }
freq_div_hz = timer_clock_freq / HZ;
@@ -263,18 +278,8 @@ static void __init xilinx_timer_init(struct device_node *timer)
#endif
xilinx_clocksource_init();
xilinx_clockevent_init();
- timer_initialized = 1;
-}
-unsigned long long notrace sched_clock(void)
-{
- if (timer_initialized) {
- struct clocksource *cs = &clocksource_microblaze;
-
- cycle_t cyc = cnt32_to_63(cs->read(NULL)) & LLONG_MAX;
- return clocksource_cyc2ns(cyc, cs->mult, cs->shift);
- }
- return 0;
+ sched_clock_register(xilinx_clock_read, 32, timer_clock_freq);
}
CLOCKSOURCE_OF_DECLARE(xilinx_timer, "xlnx,xps-timer-1.00.a",