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>

1 files changed, 16 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