[PATCH] ARM: NUC900: Implements putc() which is needed when uncompressing linux

[Li Jie]

Hi,

This patch implements the putc(), 'Uncompressing linux...done' can be
outputs when booting zImage.

Signed-off-by: lijie <eltshanli at gmail.com>
---
 arch/arm/mach-w90x900/include/mach/uncompress.h |   10 ++++++++++
 1 files changed, 10 insertions(+), 0 deletions(-)

diff --git a/arch/arm/mach-w90x900/include/mach/uncompress.h
b/arch/arm/mach-w90x900/include/mach/uncompress.h
index 050d9fe..56f1a74 100644
--- a/arch/arm/mach-w90x900/include/mach/uncompress.h
+++ b/arch/arm/mach-w90x900/include/mach/uncompress.h
@@ -22,11 +22,21 @@

 #include <mach/regs-serial.h>
 #include <mach/map.h>
+#include <linux/serial_reg.h>

 #define arch_decomp_wdog()

+#define TX_DONE	(UART_LSR_TEMT | UART_LSR_THRE)
+static volatile u32 * uart_base = (u32 *)UART0_PA;
+
 static void putc(int ch)
 {
+	/* Check THRE and TEMT bits before we transmit the character.
+	 */
+	while ((uart_base[UART_LSR] & TX_DONE) != TX_DONE)
+		barrier();
+
+	*uart_base = ch;
 }

 static inline void flush(void)
-- 
1.6.5.3