From: Afzal Mohammed <afzal@xxxxxx>
Add support for low level debugging on AM335X EVM. 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 | 21 +++++++++++++++++++++
arch/arm/plat-omap/include/plat/serial.h | 4 ++++
arch/arm/plat-omap/include/plat/uncompress.h | 6 ++++++
3 files changed, 31 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 309e328..a99ddbd 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, #TI81XXUART3 @ ti81Xx UART offsets different
beq 83f @ configure UART3
+ cmp \rp, #AM335XUART1 @ AM335X UART offsets different
+ beq 84f @ configure UART1
cmp \rp, #ZOOM_UART @ only on zoom2/3
beq 95f @ configure ZOOM_UART
@@ -106,6 +108,8 @@ omap_uart_lsr: .word 0
b 98f
83: mov \rp, #UART_OFFSET(TI81XX_UART3_BASE)
b 98f
+84: mov \rp, #UART_OFFSET(AM335X_UART1_BASE)
+ b 97f
95: ldr \rp, =ZOOM_UART_BASE
mrc p15, 0, \rv, c1, c0
tst \rv, #1 @ MMU enabled?
@@ -121,6 +125,23 @@ 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 865b13e..d7c1216 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 */
+/* AM335X serial port */
+#define AM335X_UART1_BASE 0x44E09000
+
/* External port on Zoom2/3 */
#define ZOOM_UART_BASE 0x10000000
#define ZOOM_UART_VIRT 0xfa400000
@@ -92,6 +95,7 @@
#define TI81XXUART1 81
#define TI81XXUART2 82
#define TI81XXUART3 83
+#define AM335XUART1 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 8d052e7..3592ce4 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, TI81XX_UART##p##_BASE, OMAP_PORT_SHIFT, \
TI81XXUART##p)
+#define DEBUG_LL_AM335X(p, mach) \
+ _DEBUG_LL_ENTRY(mach, AM335X_UART##p##_BASE, OMAP_PORT_SHIFT, \
+ AM335XUART##p)
+
static inline void __arch_decomp_setup(unsigned long arch_id)
{
int port = 0;
@@ -178,6 +182,8 @@ static inline void __arch_decomp_setup(unsigned long arch_id)
/* TI8148 base boards using UART1 */
DEBUG_LL_TI81XX(1, ti8148evm);
+ /* AM335x base boards using UART1 */
+ DEBUG_LL_AM335X(1, am335xevm);
} while (0);
}
--
1.6.2.4
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