summaryrefslogtreecommitdiff
path: root/arch/arm/plat-omap/counter_32k.c
diff options
context:
space:
mode:
authorR Sricharan <r.sricharan@ti.com>2012-05-10 14:17:22 +0530
committerSantosh Shilimkar <santosh.shilimkar@ti.com>2012-07-09 19:14:39 +0530
commitb009366f285d03e69aeea5f8cc466782dd6f0004 (patch)
treef4f74e4586b8151905ca86f43fc8369d74419992 /arch/arm/plat-omap/counter_32k.c
parente799840a09c7e4b7e94d08a7b8c3ec4ba81611f9 (diff)
ARM: OMAP: counter-32k: Select the CR register offset using the IP scheme
OMAP socs has a legacy and a highlander version of the 32k sync counter IP. The register offsets vary between the highlander and the legacy scheme. So use the 'SCHEME' bits(30-31) of the revision register to distinguish between the two versions and choose the CR register offset accordingly. Signed-off-by: R Sricharan <r.sricharan@ti.com> Signed-off-by: Santosh Shilimkar <santosh.shilimkar@ti.com>
Diffstat (limited to 'arch/arm/plat-omap/counter_32k.c')
-rw-r--r--arch/arm/plat-omap/counter_32k.c16
1 files changed, 13 insertions, 3 deletions
diff --git a/arch/arm/plat-omap/counter_32k.c b/arch/arm/plat-omap/counter_32k.c
index 2132c4f389e1..dbf1e03029a5 100644
--- a/arch/arm/plat-omap/counter_32k.c
+++ b/arch/arm/plat-omap/counter_32k.c
@@ -29,7 +29,10 @@
#include <plat/clock.h>
/* OMAP2_32KSYNCNT_CR_OFF: offset of 32ksync counter register */
-#define OMAP2_32KSYNCNT_CR_OFF 0x10
+#define OMAP2_32KSYNCNT_REV_OFF 0x0
+#define OMAP2_32KSYNCNT_REV_SCHEME (0x3 << 30)
+#define OMAP2_32KSYNCNT_CR_OFF_LOW 0x10
+#define OMAP2_32KSYNCNT_CR_OFF_HIGH 0x30
/*
* 32KHz clocksource ... always available, on pretty most chips except
@@ -84,9 +87,16 @@ int __init omap_init_clocksource_32k(void __iomem *vbase)
int ret;
/*
- * 32k sync Counter register offset is at 0x10
+ * 32k sync Counter IP register offsets vary between the
+ * highlander version and the legacy ones.
+ * The 'SCHEME' bits(30-31) of the revision register is used
+ * to identify the version.
*/
- sync32k_cnt_reg = vbase + OMAP2_32KSYNCNT_CR_OFF;
+ if (__raw_readl(vbase + OMAP2_32KSYNCNT_REV_OFF) &
+ OMAP2_32KSYNCNT_REV_SCHEME)
+ sync32k_cnt_reg = vbase + OMAP2_32KSYNCNT_CR_OFF_HIGH;
+ else
+ sync32k_cnt_reg = vbase + OMAP2_32KSYNCNT_CR_OFF_LOW;
/*
* 120000 rough estimate from the calculations in