[ARM] S3C64XX: Add S3C6400 CPU detection.
Add detection support for the S3C6400 SoC which has it's
id register in a different place to the S3C6410.
Signed-off-by: Ben Dooks <ben-linux@fluff.org>
diff --git a/arch/arm/plat-s3c64xx/cpu.c b/arch/arm/plat-s3c64xx/cpu.c
index f9fdaab..19f68b5 100644
--- a/arch/arm/plat-s3c64xx/cpu.c
+++ b/arch/arm/plat-s3c64xx/cpu.c
@@ -126,6 +126,14 @@
iotable_init(mach_desc, size);
idcode = __raw_readl(S3C_VA_SYS + 0x118);
+ if (!idcode) {
+ /* S3C6400 has the ID register in a different place,
+ * and needs a write before it can be read. */
+
+ __raw_writel(0x0, S3C_VA_SYS + 0xA1C);
+ idcode = __raw_readl(S3C_VA_SYS + 0xA1C);
+ }
+
s3c_init_cpu(idcode, cpu_ids, ARRAY_SIZE(cpu_ids));
}