1 files changed, 53 insertions, 0 deletions

diff --git a/arch/arm/mach-mx5/cpu.c b/arch/arm/mach-mx5/cpu.c
index 41c769f08c4d..2d37785e3857 100644
--- a/arch/arm/mach-mx5/cpu.c
+++ b/arch/arm/mach-mx5/cpu.c
@@ -14,9 +14,62 @@
 #include <linux/types.h>
 #include <linux/kernel.h>
 #include <linux/init.h>
+#include <linux/module.h>
 #include <mach/hardware.h>
 #include <asm/io.h>
 
+static int cpu_silicon_rev = -1;
+
+#define SI_REV 0x48
+
+static void query_silicon_parameter(void)
+{
+        void __iomem *rom = ioremap(MX51_IROM_BASE_ADDR, MX51_IROM_SIZE);
+        u32 rev;
+
+        if (!rom) {
+                cpu_silicon_rev = -EINVAL;
+                return;
+        }
+
+        rev = readl(rom + SI_REV);
+        switch (rev) {
+        case 0x1:
+                cpu_silicon_rev = MX51_CHIP_REV_1_0;
+                break;
+        case 0x2:
+                cpu_silicon_rev = MX51_CHIP_REV_1_1;
+                break;
+        case 0x10:
+                cpu_silicon_rev = MX51_CHIP_REV_2_0;
+                break;
+        case 0x20:
+                cpu_silicon_rev = MX51_CHIP_REV_3_0;
+                break;
+        default:
+                cpu_silicon_rev = 0;
+        }
+
+        iounmap(rom);
+}
+
+/*
+ * Returns:
+ *      the silicon revision of the cpu
+ *      -EINVAL - not a mx51
+ */
+int mx51_revision(void)
+{
+        if (!cpu_is_mx51())
+                return -EINVAL;
+
+        if (cpu_silicon_rev == -1)
+                query_silicon_parameter();
+
+        return cpu_silicon_rev;
+}
+EXPORT_SYMBOL(mx51_revision);
+
 static int __init post_cpu_init(void)
 {
         unsigned int reg;