[POWERPC] Add uartlite boot console driver for the zImage wrapper

Signed-off-by: Grant Likely <grant.likely@secretlab.ca>
Acked-by: Peter Korsgaard <jacmet@sunsite.dk>
Signed-off-by: Paul Mackerras <paulus@samba.org>

1 files changed, 37 insertions, 0 deletions

diff --git a/arch/ppc/boot/simple/uartlite_tty.c b/arch/ppc/boot/simple/uartlite_tty.c
new file mode 100644
index 000000000000..0eae1eab38d4
--- /dev/null
+++ b/arch/ppc/boot/simple/uartlite_tty.c
@@ -0,0 +1,37 @@
+/*
+ * Xilinx UARTLITE bootloader driver
+ *
+ * Copyright (c) 2007 Secret Lab Technologies Ltd.
+ *
+ * This program is free software; you can redistribute  it and/or modify it
+ * under  the terms of  the GNU General  Public License as published by the
+ * Free Software Foundation;  either version 2 of the  License, or (at your
+ * option) any later version.
+ */
+
+#include <linux/types.h>
+#include <asm/serial.h>
+#include <asm/io.h>
+#include <platforms/4xx/xparameters/xparameters.h>
+
+#define UARTLITE_BASEADDR ((void*)(XPAR_UARTLITE_0_BASEADDR))
+
+void
+serial_putc(unsigned long com_port, unsigned char c)
+{
+	while ((in_be32(UARTLITE_BASEADDR + 0x8) & 0x08) != 0); /* spin */
+	out_be32(UARTLITE_BASEADDR + 0x4, c);
+}
+
+unsigned char
+serial_getc(unsigned long com_port)
+{
+	while ((in_be32(UARTLITE_BASEADDR + 0x8) & 0x01) == 0); /* spin */
+	return in_be32(UARTLITE_BASEADDR);
+}
+
+int
+serial_tstc(unsigned long com_port)
+{
+	return ((in_be32(UARTLITE_BASEADDR + 0x8) & 0x01) != 0);
+}