ARM: mmp: implement DEBUG_LL port choice

DEBUG_LL port must be choiced in arch-mmp. DEBUG_LL port should be
UART2 in TTC DKB. And it should be UART3 in brownstone.

Signed-off-by: Haojian Zhuang <haojian.zhuang@gmail.com>

2 files changed, 24 insertions, 2 deletions

diff --git a/arch/arm/Kconfig.debug b/arch/arm/Kconfig.debug
index f15f82bf3a50..0919191b8aa5 100644
--- a/arch/arm/Kconfig.debug
+++ b/arch/arm/Kconfig.debug
@@ -224,6 +224,20 @@ choice
                   Say Y here if you want kernel low-level debugging support
                   on i.MX6Q UART4.
 
+        config DEBUG_MMP_UART2
+                bool "Kernel low-level debugging message via MMP UART2"
+                depends on ARCH_MMP
+                help
+                  Say Y here if you want kernel low-level debugging support
+                  on MMP UART2.
+
+        config DEBUG_MMP_UART3
+                bool "Kernel low-level debugging message via MMP UART3"
+                depends on ARCH_MMP
+                help
+                  Say Y here if you want kernel low-level debugging support
+                  on MMP UART3.
+
         config DEBUG_MSM_UART1
                 bool "Kernel low-level debugging messages via MSM UART1"
                 depends on ARCH_MSM7X00A || ARCH_MSM7X30 || ARCH_QSD8X50
diff --git a/arch/arm/mach-mmp/include/mach/debug-macro.S b/arch/arm/mach-mmp/include/mach/debug-macro.S
index b6f14d203c25..5c3cc29688ab 100644
--- a/arch/arm/mach-mmp/include/mach/debug-macro.S
+++ b/arch/arm/mach-mmp/include/mach/debug-macro.S
@@ -9,13 +9,21 @@
  * published by the Free Software Foundation.
  */
 
+#if defined(CONFIG_DEBUG_MMP_UART2)
+#define MMP_UART_OFFSET 0x00017000
+#elif defined(CONFIG_DEBUG_MMP_UART3)
+#define MMP_UART_OFFSET 0x00018000
+#else
+#error "Select uart for DEBUG_LL"
+#endif
+
 #include <mach/addr-map.h>
 
                 .macro  addruart, rp, rv, tmp
                 ldr     \rp, =APB_PHYS_BASE             @ physical
                 ldr     \rv, =APB_VIRT_BASE             @ virtual
-                orr     \rp, \rp, #0x00017000
-                orr     \rv, \rv, #0x00017000
+                orr     \rp, \rp, #MMP_UART_OFFSET
+                orr     \rv, \rv, #MMP_UART_OFFSET
                 .endm
 
 #define UART_SHIFT      2