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Diffstat (limited to 'arch/arm/mach-imx/cpu-imx27.c')
-rw-r--r--arch/arm/mach-imx/cpu-imx27.c28
1 files changed, 13 insertions, 15 deletions
diff --git a/arch/arm/mach-imx/cpu-imx27.c b/arch/arm/mach-imx/cpu-imx27.c
index 3b117be37bd..ff38e1505f6 100644
--- a/arch/arm/mach-imx/cpu-imx27.c
+++ b/arch/arm/mach-imx/cpu-imx27.c
@@ -26,12 +26,12 @@
#include <mach/hardware.h>
-static int cpu_silicon_rev = -1;
-static int cpu_partnumber;
+static int mx27_cpu_rev = -1;
+static int mx27_cpu_partnumber;
#define SYS_CHIP_ID 0x00 /* The offset of CHIP ID register */
-static void query_silicon_parameter(void)
+static int mx27_read_cpu_rev(void)
{
u32 val;
/*
@@ -42,20 +42,18 @@ static void query_silicon_parameter(void)
val = __raw_readl(MX27_IO_ADDRESS(MX27_SYSCTRL_BASE_ADDR
+ SYS_CHIP_ID));
+ mx27_cpu_partnumber = (int)((val >> 12) & 0xFFFF);
+
switch (val >> 28) {
case 0:
- cpu_silicon_rev = IMX_CHIP_REVISION_1_0;
- break;
+ return IMX_CHIP_REVISION_1_0;
case 1:
- cpu_silicon_rev = IMX_CHIP_REVISION_2_0;
- break;
+ return IMX_CHIP_REVISION_2_0;
case 2:
- cpu_silicon_rev = IMX_CHIP_REVISION_2_1;
- break;
+ return IMX_CHIP_REVISION_2_1;
default:
- cpu_silicon_rev = IMX_CHIP_REVISION_UNKNOWN;
+ return IMX_CHIP_REVISION_UNKNOWN;
}
- cpu_partnumber = (int)((val >> 12) & 0xFFFF);
}
/*
@@ -65,12 +63,12 @@ static void query_silicon_parameter(void)
*/
int mx27_revision(void)
{
- if (cpu_silicon_rev == -1)
- query_silicon_parameter();
+ if (mx27_cpu_rev == -1)
+ mx27_cpu_rev = mx27_read_cpu_rev();
- if (cpu_partnumber != 0x8821)
+ if (mx27_cpu_partnumber != 0x8821)
return -EINVAL;
- return cpu_silicon_rev;
+ return mx27_cpu_rev;
}
EXPORT_SYMBOL(mx27_revision);