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>

3 files changed, 26 insertions, 1 deletions

diff --git a/arch/arm/mach-omap2/include/mach/debug-macro.S b/arch/arm/mach-omap2/include/mach/debug-macro.S
index cdfc2a1f0e75..d7f844a99a7b 100644
--- a/arch/arm/mach-omap2/include/mach/debug-macro.S
+++ b/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
diff --git a/arch/arm/plat-omap/include/plat/serial.h b/arch/arm/plat-omap/include/plat/serial.h
index b073e5f2b190..28e2d250c2fd 100644
--- a/arch/arm/plat-omap/include/plat/serial.h
+++ b/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 */
diff --git a/arch/arm/plat-omap/include/plat/uncompress.h b/arch/arm/plat-omap/include/plat/uncompress.h
index cc3f11ba7a99..ac4323390213 100644
--- a/arch/arm/plat-omap/include/plat/uncompress.h
+++ b/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);
 }