TI816X: Add low level debug support

This patch adds support for low level debugging on TI816X boards. Currently the
support for UART3 console on TI816X EVM is added.

Signed-off-by: Hemant Pedanekar <hemantp@ti.com>
Reviewed-by: Kevin Hilman <khilman@ti.com>
Signed-off-by: Tony Lindgren <tony@atomide.com>

3 files changed, 27 insertions, 0 deletions

diff --git a/arch/arm/mach-omap2/include/mach/debug-macro.S b/arch/arm/mach-omap2/include/mach/debug-macro.S
index 6a4d4136002e..e1b0f17b0927 100644
--- a/arch/arm/mach-omap2/include/mach/debug-macro.S
+++ b/arch/arm/mach-omap2/include/mach/debug-macro.S
@@ -69,6 +69,12 @@ omap_uart_lsr:	.word	0
                 beq     34f                     @ configure OMAP3UART4
                 cmp     \rp, #OMAP4UART4        @ only on 44xx
                 beq     44f                     @ configure OMAP4UART4
+                cmp     \rp, #TI816XUART1       @ ti816x UART offsets different
+                beq     81f                     @ configure UART1
+                cmp     \rp, #TI816XUART2       @ ti816x UART offsets different
+                beq     82f                     @ configure UART2
+                cmp     \rp, #TI816XUART3       @ ti816x UART offsets different
+                beq     83f                     @ configure UART3
                 cmp     \rp, #ZOOM_UART         @ only on zoom2/3
                 beq     95f                     @ configure ZOOM_UART
 
@@ -91,6 +97,12 @@ omap_uart_lsr:	.word	0
                 b       98f
 44:             mov     \rp, #UART_OFFSET(OMAP4_UART4_BASE)
                 b       98f
+81:             mov     \rp, #UART_OFFSET(TI816X_UART1_BASE)
+                b       98f
+82:             mov     \rp, #UART_OFFSET(TI816X_UART2_BASE)
+                b       98f
+83:             mov     \rp, #UART_OFFSET(TI816X_UART3_BASE)
+                b       98f
 95:             ldr     \rp, =ZOOM_UART_BASE
                 mrc     p15, 0, \rv, c1, c0
                 tst     \rv, #1                 @ MMU enabled?
diff --git a/arch/arm/plat-omap/include/plat/serial.h b/arch/arm/plat-omap/include/plat/serial.h
index a1a118d052ef..8061695aa523 100644
--- a/arch/arm/plat-omap/include/plat/serial.h
+++ b/arch/arm/plat-omap/include/plat/serial.h
@@ -51,6 +51,11 @@
 #define OMAP4_UART3_BASE        0x48020000
 #define OMAP4_UART4_BASE        0x4806e000
 
+/* TI816X serial ports */
+#define TI816X_UART1_BASE       0x48020000
+#define TI816X_UART2_BASE       0x48022000
+#define TI816X_UART3_BASE       0x48024000
+
 /* External port on Zoom2/3 */
 #define ZOOM_UART_BASE          0x10000000
 #define ZOOM_UART_VIRT          0xfa400000
@@ -81,6 +86,9 @@
 #define OMAP4UART2              OMAP2UART2
 #define OMAP4UART3              43
 #define OMAP4UART4              44
+#define TI816XUART1             81
+#define TI816XUART2             82
+#define TI816XUART3             83
 #define ZOOM_UART               95              /* Only on zoom2/3 */
 
 /* This is only used by 8250.c for omap1510 */
diff --git a/arch/arm/plat-omap/include/plat/uncompress.h b/arch/arm/plat-omap/include/plat/uncompress.h
index ad98b85cae21..30b891c4a93f 100644
--- a/arch/arm/plat-omap/include/plat/uncompress.h
+++ b/arch/arm/plat-omap/include/plat/uncompress.h
@@ -93,6 +93,10 @@ static inline void flush(void)
 #define DEBUG_LL_ZOOM(mach)                                             \
         _DEBUG_LL_ENTRY(mach, ZOOM_UART_BASE, ZOOM_PORT_SHIFT, ZOOM_UART)
 
+#define DEBUG_LL_TI816X(p, mach)                                        \
+        _DEBUG_LL_ENTRY(mach, TI816X_UART##p##_BASE, OMAP_PORT_SHIFT,   \
+                TI816XUART##p)
+
 static inline void __arch_decomp_setup(unsigned long arch_id)
 {
         int port = 0;
@@ -166,6 +170,9 @@ static inline void __arch_decomp_setup(unsigned long arch_id)
                 DEBUG_LL_ZOOM(omap_zoom2);
                 DEBUG_LL_ZOOM(omap_zoom3);
 
+                /* TI8168 base boards using UART3 */
+                DEBUG_LL_TI816X(3, ti8168evm);
+
         } while (0);
 }