[POWERPC] Virtex: Add uartlite bootwrapper driver

Allows the bootwrapper to use the uartlite device for console output.

Signed-off-by: Grant Likely <grant.likely@secretlab.ca>
Signed-off-by: Josh Boyer <jwboyer@linux.vnet.ibm.com>

1 files changed, 64 insertions, 0 deletions

diff --git a/arch/powerpc/boot/uartlite.c b/arch/powerpc/boot/uartlite.c
new file mode 100644
index 000000000000..f4249a74c367
--- /dev/null
+++ b/arch/powerpc/boot/uartlite.c
@@ -0,0 +1,64 @@
+/*
+ * Xilinx UARTLITE bootloader driver
+ *
+ * Copyright (C) 2007 Secret Lab Technologies Ltd.
+ *
+ * This file is licensed under the terms of the GNU General Public License
+ * version 2. This program is licensed "as is" without any warranty of any
+ * kind, whether express or implied.
+ */
+
+#include <stdarg.h>
+#include <stddef.h>
+#include "types.h"
+#include "string.h"
+#include "stdio.h"
+#include "io.h"
+#include "ops.h"
+
+static void * reg_base;
+
+static int uartlite_open(void)
+{
+	/* Clear the RX FIFO */
+	out_be32(reg_base + 0x0C, 0x2);
+	return 0;
+}
+
+static void uartlite_putc(unsigned char c)
+{
+	while ((in_be32(reg_base + 0x8) & 0x08) != 0); /* spin */
+	out_be32(reg_base + 0x4, c);
+}
+
+static unsigned char uartlite_getc(void)
+{
+	while ((in_be32(reg_base + 0x8) & 0x01) == 0); /* spin */
+	return in_be32(reg_base);
+}
+
+static u8 uartlite_tstc(void)
+{
+	return ((in_be32(reg_base + 0x8) & 0x01) != 0);
+}
+
+int uartlite_console_init(void *devp, struct serial_console_data *scdp)
+{
+	int n;
+	unsigned long reg_phys;
+
+	n = getprop(devp, "virtual-reg", &reg_base, sizeof(reg_base));
+	if (n != sizeof(reg_base)) {
+		if (!dt_xlate_reg(devp, 0, &reg_phys, NULL))
+			return -1;
+
+		reg_base = (void *)reg_phys;
+	}
+
+	scdp->open = uartlite_open;
+	scdp->putc = uartlite_putc;
+	scdp->getc = uartlite_getc;
+	scdp->tstc = uartlite_tstc;
+	scdp->close = NULL;
+	return 0;
+}