ARM: EXYNOS: Fix UART address selection for DEBUG_LL

The Exynos542x SoCs using A15+A7 can boot to A15 or A7. If it boots using
A7 (like on Odroid XU family boards), it can't choose right UART
physical address only the part number of CP15. Fix the detection logic
by checking the Cluster ID additionally.

Signed-off-by: Joonyoung Shim <jy0922.shim@samsung.com>
Tested-by: Marek Szyprowski <m.szyprowski@samsung.com>
[k.kozlowski: Extend commit message]
Signed-off-by: Krzysztof Kozlowski <k.kozlowski@samsung.com>

1 files changed, 5 insertions, 1 deletions

diff --git a/arch/arm/include/debug/exynos.S b/arch/arm/include/debug/exynos.S
index b17fdb7fbd34..60bf3c23200d 100644
--- a/arch/arm/include/debug/exynos.S
+++ b/arch/arm/include/debug/exynos.S
@@ -24,7 +24,11 @@
                 mrc     p15, 0, \tmp, c0, c0, 0
                 and     \tmp, \tmp, #0xf0
                 teq     \tmp, #0xf0             @@ A15
-                ldreq   \rp, =EXYNOS5_PA_UART
+                beq     100f
+                mrc     p15, 0, \tmp, c0, c0, 5
+                and     \tmp, \tmp, #0xf00
+                teq     \tmp, #0x100            @@ A15 + A7 but boot to A7
+100:            ldreq   \rp, =EXYNOS5_PA_UART
                 movne   \rp, #EXYNOS4_PA_UART   @@ EXYNOS4
                 ldr     \rv, =S3C_VA_UART
 #if CONFIG_DEBUG_S3C_UART != 0