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>

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?

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 */

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);
 }