From: Afzal Mohammed <afzal@xxxxxx>
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@xxxxxx>
Signed-off-by: Vaibhav Hiremath <hvaibhav@xxxxxx>
---
arch/arm/mach-omap2/include/mach/debug-macro.S | 22 ++++++++++++++++++++++
arch/arm/plat-omap/include/plat/serial.h | 4 ++++
arch/arm/plat-omap/include/plat/uncompress.h | 6 ++++++
3 files changed, 32 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 48adfe9..f649973 100644
--- a/arch/arm/mach-omap2/include/mach/debug-macro.S
+++ b/arch/arm/mach-omap2/include/mach/debug-macro.S
@@ -78,6 +78,8 @@ omap_uart_lsr: .word 0
beq 82f @ configure UART2
cmp \rp, #TI816XUART3 @ ti816x 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
@@ -106,6 +108,9 @@ omap_uart_lsr: .word 0
b 98f
83: mov \rp, #UART_OFFSET(TI816X_UART3_BASE)
b 98f
+84: ldr \rp, =AM33XX_UART1_BASE
+ and \rp, \rp, #0x00ffffff
+ b 97f
95: ldr \rp, =ZOOM_UART_BASE
mrc p15, 0, \rv, c1, c0
tst \rv, #1 @ MMU enabled?
@@ -121,6 +126,23 @@ omap_uart_lsr: .word 0
b 10b
/* Store both phys and virt address for the uart */
+97: add \rp, \rp, #0x44000000 @ phys base
+ mrc p15, 0, \rv, c1, c0
+ tst \rv, #1 @ MMU enabled?
+ ldreq \rv, =omap_uart_v2p(omap_uart_phys) @ MMU disabled
+ ldrne \rv, =omap_uart_phys @ MMU enabled
+ str \rp, [\rv, #0]
+ sub \rp, \rp, #0x44000000 @ phys base
+ add \rp, \rp, #0xf9000000 @ virt base
+ add \rv, \rv, #4 @ omap_uart_virt
+ str \rp, [\rv, #0]
+ mov \rp, #(UART_LSR << OMAP_PORT_SHIFT)
+ add \rv, \rv, #4 @ omap_uart_lsr
+ str \rp, [\rv, #0]
+
+ b 10b
+
+ /* Store both phys and virt address for the uart */
98: add \rp, \rp, #0x48000000 @ phys 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 de3b10c..ad19377 100644
--- a/arch/arm/plat-omap/include/plat/serial.h
+++ b/arch/arm/plat-omap/include/plat/serial.h
@@ -59,6 +59,9 @@
/* 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
@@ -92,6 +95,7 @@
#define TI816XUART1 81
#define TI816XUART2 82
#define TI816XUART3 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 a067484..bd1e051 100644
--- a/arch/arm/plat-omap/include/plat/uncompress.h
+++ b/arch/arm/plat-omap/include/plat/uncompress.h
@@ -97,6 +97,10 @@ static inline void flush(void)
_DEBUG_LL_ENTRY(mach, TI816X_UART##p##_BASE, OMAP_PORT_SHIFT, \
TI816XUART##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;
@@ -173,6 +177,8 @@ static inline void __arch_decomp_setup(unsigned long arch_id)
/* TI8168 base boards using UART3 */
DEBUG_LL_TI816X(3, ti8168evm);
+ /* AM33XX base boards using UART1 */
+ DEBUG_LL_AM33XX(1, am335xevm);
} while (0);
}
--
1.7.0.4
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