ARM: OMAP2+: am33xx: Add low level debugging support

Add support for low level debugging on AM335X EVM (AM33XX family).
Currently only support for UART1 console, which is used on AM335X EVM
is added.

Signed-off-by: Afzal Mohammed <afzal@ti.com>
Signed-off-by: Vaibhav Hiremath <hvaibhav@ti.com>
Reviewed-by: Kevin Hilman <khilman@ti.com>
Cc: Paul Walmsley <paul@pwsan.com>
Signed-off-by: Tony Lindgren <tony@atomide.com>

arch/arm/mach-omap2/include/mach/debug-macro.S

@@ -72,6 +72,8 @@ omap_uart_lsr:	.word	0
 		beq	82f			@ configure UART2
 		cmp	\rp, #TI81XXUART3	@ ti81Xx UART offsets different
 		beq	83f			@ configure UART3
+		cmp	\rp, #AM33XXUART1	@ AM33XX UART offsets different
+		beq	84f			@ configure UART1
 		cmp	\rp, #ZOOM_UART		@ only on zoom2/3
 		beq	95f			@ configure ZOOM_UART
 
@@ -100,7 +102,9 @@ omap_uart_lsr:	.word	0
 		b	98f
 83:		mov	\rp, #UART_OFFSET(TI81XX_UART3_BASE)
 		b	98f
-
+84:		ldr	\rp, =AM33XX_UART1_BASE
+		and	\rp, \rp, #0x00ffffff
+		b	97f
 95:		ldr	\rp, =ZOOM_UART_BASE
 		str	\rp, [\tmp, #0]		@ omap_uart_phys
 		ldr	\rp, =ZOOM_UART_VIRT
@@ -109,6 +113,17 @@ omap_uart_lsr:	.word	0
 		str	\rp, [\tmp, #8]		@ omap_uart_lsr
 		b	10b
 
+		/* AM33XX: Store both phys and virt address for the uart */
+97:		add	\rp, \rp, #0x44000000	@ phys base
+		str	\rp, [\tmp, #0]		@ omap_uart_phys
+		sub	\rp, \rp, #0x44000000	@ phys base
+		add	\rp, \rp, #0xf9000000	@ virt base
+		str	\rp, [\tmp, #4]		@ omap_uart_virt
+		mov	\rp, #(UART_LSR << OMAP_PORT_SHIFT)
+		str	\rp, [\tmp, #8]		@ omap_uart_lsr
+
+		b	10b
+
 		/* Store both phys and virt address for the uart */
 98:		add	\rp, \rp, #0x48000000	@ phys base
 		str	\rp, [\tmp, #0]		@ omap_uart_phys

arch/arm/plat-omap/include/plat/serial.h

@@ -60,6 +60,9 @@
 /* AM3505/3517 UART4 */
 #define AM35XX_UART4_BASE	0x4809E000	/* Only on AM3505/3517 */
 
+/* AM33XX serial port */
+#define AM33XX_UART1_BASE	0x44E09000
+
 /* External port on Zoom2/3 */
 #define ZOOM_UART_BASE		0x10000000
 #define ZOOM_UART_VIRT		0xfa400000
@@ -93,6 +96,7 @@
 #define TI81XXUART1		81
 #define TI81XXUART2		82
 #define TI81XXUART3		83
+#define AM33XXUART1		84
 #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

@@ -103,6 +103,10 @@ static inline void flush(void)
 	_DEBUG_LL_ENTRY(mach, TI81XX_UART##p##_BASE, OMAP_PORT_SHIFT,	\
 		TI81XXUART##p)
 
+#define DEBUG_LL_AM33XX(p, mach)					\
+	_DEBUG_LL_ENTRY(mach, AM33XX_UART##p##_BASE, OMAP_PORT_SHIFT,	\
+		AM33XXUART##p)
+
 static inline void __arch_decomp_setup(unsigned long arch_id)
 {
 	int port = 0;
@@ -183,6 +187,8 @@ static inline void __arch_decomp_setup(unsigned long arch_id)
 		/* TI8148 base boards using UART1 */
 		DEBUG_LL_TI81XX(1, ti8148evm);
 
+		/* AM33XX base boards using UART1 */
+		DEBUG_LL_AM33XX(1, am335xevm);
 	} while (0);
 }