[PATCH v2 2/7] ARM: uemd: add DEBUG_LL support

[Antony Pavlov <antonynpavlov@gmail.com>]

Signed-off-by: Antony Pavlov <antonynpavlov@gmail.com>
---
 arch/arm/Kconfig                           |  1 +
 arch/arm/mach-uemd/include/mach/debug_ll.h | 42 ++++++++++++++++++++++++++++++
 2 files changed, 43 insertions(+)

diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig
index 81ee19b..c236a9e 100644
--- a/arch/arm/Kconfig
+++ b/arch/arm/Kconfig
@@ -203,6 +203,7 @@ config ARCH_UEMD
 	select OFDEVICE
 	select OFTREE
 	select CLOCKSOURCE_UEMD
+	select HAS_DEBUG_LL
 
 config ARCH_ZYNQ
 	bool "Xilinx Zynq-based boards"
diff --git a/arch/arm/mach-uemd/include/mach/debug_ll.h b/arch/arm/mach-uemd/include/mach/debug_ll.h
new file mode 100644
index 0000000..ce18244
--- /dev/null
+++ b/arch/arm/mach-uemd/include/mach/debug_ll.h
@@ -0,0 +1,42 @@
+/*
+ * Copyright (C) 2014 Antony Pavlov <antonynpavlov@gmail.com>
+ *
+ * This file is part of barebox.
+ * See file CREDITS for list of people who contributed to this project.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2
+ * as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ */
+
+/** @file
+ *  This File contains declaration for early output support
+ */
+#ifndef __INCLUDE_ARCH_DEBUG_LL_H__
+#define __INCLUDE_ARCH_DEBUG_LL_H__
+
+#include <asm/io.h>
+#include <mach/hardware.h>
+
+#define DEBUG_LL_UART_ADDR	UEMD_UART0_BASE
+#define DEBUG_LL_UART_RSHFT	2
+
+#define rbr		(0 << DEBUG_LL_UART_RSHFT)
+#define lsr		(5 << DEBUG_LL_UART_RSHFT)
+#define LSR_THRE	0x20	/* Xmit holding register empty */
+
+static inline void PUTC_LL(char ch)
+{
+	while (!(__raw_readb(DEBUG_LL_UART_ADDR + lsr) & LSR_THRE))
+		;
+
+	__raw_writeb(ch, DEBUG_LL_UART_ADDR + rbr);
+}
+
+#endif /* __INCLUDE_ARCH_DEBUG_LL_H__ */
-- 
1.9.2


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