From: Greg Ungerer <gerg@xxxxxxxxxxx>
Acquire the SoC clock when using the DMA timer hardware module. With the
clock acquired we can enable it and get it ticking. On most ColdFire SoC
hardware the DMA timer clock is not enabled by default.
Signed-off-by: Greg Ungerer <gerg@xxxxxxxxxxx>
---
arch/m68k/platform/coldfire/dma_timer.c | 7 +++++++
1 file changed, 7 insertions(+)
diff --git a/arch/m68k/platform/coldfire/dma_timer.c b/arch/m68k/platform/coldfire/dma_timer.c
index 9b7b950..1f8d967 100644
--- a/arch/m68k/platform/coldfire/dma_timer.c
+++ b/arch/m68k/platform/coldfire/dma_timer.c
@@ -7,6 +7,7 @@
*/
#include <linux/clocksource.h>
+#include <linux/clk.h>
#include <linux/io.h>
#include <asm/machdep.h>
@@ -44,12 +45,18 @@ static struct clocksource clocksource_cf_dt = {
static int __init init_cf_dt_clocksource(void)
{
+ struct clk *clk;
+
/*
* We setup DMA timer 0 in free run mode. This incrementing counter is
* used as a highly precious clock source. With MCF_CLOCK = 150 MHz we
* get a ~213 ns resolution and the 32bit register will overflow almost
* every 15 minutes.
*/
+ clk = clk_get(NULL, "mcftmr.0");
+ if (clk)
+ clk_enable(clk);
+
__raw_writeb(0x00, DTXMR0);
__raw_writeb(0x00, DTER0);
__raw_writel(0x00000000, DTRR0);
--
1.8.1.4
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