Today we only use the DBGU port
Signed-off-by: Jean-Christophe PLAGNIOL-VILLARD <plagnioj@xxxxxxxxxxxx>
---
arch/arm/Kconfig | 1 +
arch/arm/mach-at91/include/mach/debug_ll.h | 37 ++++++++++++++++++++++++++++
2 files changed, 38 insertions(+)
create mode 100644 arch/arm/mach-at91/include/mach/debug_ll.h
diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig
index 245bec8..a7f1bfb 100644
--- a/arch/arm/Kconfig
+++ b/arch/arm/Kconfig
@@ -25,6 +25,7 @@ config ARCH_AT91
bool "Atmel AT91"
select GENERIC_GPIO
select CLKDEV_LOOKUP
+ select HAS_DEBUG_LL
config ARCH_EP93XX
bool "Cirrus Logic EP93xx"
diff --git a/arch/arm/mach-at91/include/mach/debug_ll.h b/arch/arm/mach-at91/include/mach/debug_ll.h
new file mode 100644
index 0000000..ee824cb
--- /dev/null
+++ b/arch/arm/mach-at91/include/mach/debug_ll.h
@@ -0,0 +1,37 @@
+/*
+ * Copyright (C) 2012
+ * Jean-Christophe PLAGNIOL-VILLARD <planioj@xxxxxxxxxxxx>
+ *
+ * Under GPLv2
+ */
+
+#ifndef __MACH_DEBUG_LL_H__
+#define __MACH_DEBUG_LL_H__
+
+#include <asm/io.h>
+#include <mach/hardware.h>
+
+#define UART_BASE (AT91_BASE_SYS + AT91_DBGU)
+
+#define ATMEL_US_CSR 0x0014
+#define ATMEL_US_THR 0x001c
+#define ATMEL_US_TXRDY (1 << 1)
+#define ATMEL_US_TXEMPTY (1 << 9)
+
+/*
+ * The following code assumes the serial port has already been
+ * initialized by the bootloader. If you didn't setup a port in
+ * your bootloader then nothing will appear (which might be desired).
+ *
+ * This does not append a newline
+ */
+static void putc(int c)
+{
+ while (!(__raw_readl(UART_BASE + ATMEL_US_CSR) & ATMEL_US_TXRDY))
+ barrier();
+ __raw_writel(c, UART_BASE + ATMEL_US_THR);
+
+ while (!(__raw_readl(UART_BASE + ATMEL_US_CSR) & ATMEL_US_TXEMPTY))
+ barrier();
+}
+#endif
--
1.7.10.4
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