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-rw-r--r--arch/arm/Kconfig.debug26
-rw-r--r--arch/arm/mach-vexpress/include/mach/debug-macro.S41
-rw-r--r--arch/arm/mach-vexpress/include/mach/uncompress.h14
3 files changed, 81 insertions, 0 deletions
diff --git a/arch/arm/Kconfig.debug b/arch/arm/Kconfig.debug
index 01a134141216..a03b5a7059e2 100644
--- a/arch/arm/Kconfig.debug
+++ b/arch/arm/Kconfig.debug
@@ -310,6 +310,32 @@ choice
The uncompressor code port configuration is now handled
by CONFIG_S3C_LOWLEVEL_UART_PORT.
+ config DEBUG_VEXPRESS_UART0_DETECT
+ bool "Autodetect UART0 on Versatile Express Cortex-A core tiles"
+ depends on ARCH_VEXPRESS && CPU_CP15_MMU
+ help
+ This option enables a simple heuristic which tries to determine
+ the motherboard's memory map variant (original or RS1) and then
+ choose the relevant UART0 base address.
+
+ Note that this will only work with standard A-class core tiles,
+ and may fail with non-standard SMM or custom software models.
+
+ config DEBUG_VEXPRESS_UART0_CA9
+ bool "Use PL011 UART0 at 0x10009000 (V2P-CA9 core tile)"
+ depends on ARCH_VEXPRESS
+ help
+ This option selects UART0 at 0x10009000. Except for custom models,
+ this applies only to the V2P-CA9 tile.
+
+ config DEBUG_VEXPRESS_UART0_RS1
+ bool "Use PL011 UART0 at 0x1c090000 (RS1 complaint tiles)"
+ depends on ARCH_VEXPRESS
+ help
+ This option selects UART0 at 0x1c090000. This applies to most
+ of the tiles using the RS1 memory map, including all new A-class
+ core tiles, FPGA-based SMMs and software models.
+
config DEBUG_LL_UART_NONE
bool "No low-level debugging UART"
help
diff --git a/arch/arm/mach-vexpress/include/mach/debug-macro.S b/arch/arm/mach-vexpress/include/mach/debug-macro.S
index fa8224794e0b..9f509f55d078 100644
--- a/arch/arm/mach-vexpress/include/mach/debug-macro.S
+++ b/arch/arm/mach-vexpress/include/mach/debug-macro.S
@@ -18,6 +18,8 @@
#define DEBUG_LL_VIRT_BASE 0xf8000000
+#if defined(CONFIG_DEBUG_VEXPRESS_UART0_DETECT)
+
.macro addruart,rp,rv,tmp
@ Make an educated guess regarding the memory map:
@@ -41,3 +43,42 @@
.endm
#include <asm/hardware/debug-pl01x.S>
+
+#elif defined(CONFIG_DEBUG_VEXPRESS_UART0_CA9)
+
+ .macro addruart,rp,rv,tmp
+ mov \rp, #DEBUG_LL_UART_OFFSET
+ orr \rv, \rp, #DEBUG_LL_VIRT_BASE
+ orr \rp, \rp, #DEBUG_LL_PHYS_BASE
+ .endm
+
+#include <asm/hardware/debug-pl01x.S>
+
+#elif defined(CONFIG_DEBUG_VEXPRESS_UART0_RS1)
+
+ .macro addruart,rp,rv,tmp
+ mov \rp, #DEBUG_LL_UART_OFFSET_RS1
+ orr \rv, \rp, #DEBUG_LL_VIRT_BASE
+ orr \rp, \rp, #DEBUG_LL_PHYS_BASE_RS1
+ .endm
+
+#include <asm/hardware/debug-pl01x.S>
+
+#else /* CONFIG_DEBUG_LL_UART_NONE */
+
+ .macro addruart, rp, rv, tmp
+ /* Safe dummy values */
+ mov \rp, #0
+ mov \rv, #DEBUG_LL_VIRT_BASE
+ .endm
+
+ .macro senduart,rd,rx
+ .endm
+
+ .macro waituart,rd,rx
+ .endm
+
+ .macro busyuart,rd,rx
+ .endm
+
+#endif
diff --git a/arch/arm/mach-vexpress/include/mach/uncompress.h b/arch/arm/mach-vexpress/include/mach/uncompress.h
index 7dab5596b868..1e472eb0bbdc 100644
--- a/arch/arm/mach-vexpress/include/mach/uncompress.h
+++ b/arch/arm/mach-vexpress/include/mach/uncompress.h
@@ -27,6 +27,7 @@
static unsigned long get_uart_base(void)
{
+#if defined(CONFIG_DEBUG_VEXPRESS_UART0_DETECT)
unsigned long mpcore_periph;
/*
@@ -42,6 +43,13 @@ static unsigned long get_uart_base(void)
return UART_BASE;
else
return UART_BASE_RS1;
+#elif defined(CONFIG_DEBUG_VEXPRESS_UART0_CA9)
+ return UART_BASE;
+#elif defined(CONFIG_DEBUG_VEXPRESS_UART0_RS1)
+ return UART_BASE_RS1;
+#else
+ return 0;
+#endif
}
/*
@@ -51,6 +59,9 @@ static inline void putc(int c)
{
unsigned long base = get_uart_base();
+ if (!base)
+ return;
+
while (AMBA_UART_FR(base) & (1 << 5))
barrier();
@@ -61,6 +72,9 @@ static inline void flush(void)
{
unsigned long base = get_uart_base();
+ if (!base)
+ return;
+
while (AMBA_UART_FR(base) & (1 << 3))
barrier();
}