[U-Boot] [PATCH] serial: add support for the OMRPv2 simple wishbone UART

[Florian Fainelli <florian.fainelli@openpattern.org>]

(please CC me as I am not on the list yet).
--
From: Florian Fainelli <florian.fainelli@openpattern.org>
Date: Wed, 24 Sep 2008 10:46:10 +0200
Subject: [PATCH] serial: add support for the OMRPv2 simple wishbone UART

This patch adds support for the wishbone UART we are using on the
OpenPattern Modular Routing Platform v2. wb_uart HDL files can be found
here : https://dev.openpattern.org/browser/trunk/fpga/aemb/rtl/wb_uart

Signed-off-by: Florian Fainelli <florian.fainelli@openpattern.org>
---
 drivers/serial/Makefile                           |    1 +
 drivers/serial/serial_wbuart.c                    |   73 +++++++++++++++++++++
 include/asm-microblaze/arch-microblaze/wbuart_l.h |   15 ++++
 include/asm-microblaze/serial_wbuart.h            |   25 +++++++
 4 files changed, 114 insertions(+), 0 deletions(-)
 create mode 100644 drivers/serial/serial_wbuart.c
 create mode 100644 include/asm-microblaze/arch-microblaze/wbuart_l.h
 create mode 100644 include/asm-microblaze/serial_wbuart.h

diff --git a/drivers/serial/Makefile b/drivers/serial/Makefile
index c9e797e..12dfaa2 100644
--- a/drivers/serial/Makefile
+++ b/drivers/serial/Makefile
@@ -36,6 +36,7 @@ COBJS-y += serial_pl010.o
 COBJS-y += serial_pl011.o
 COBJS-y += serial_xuartlite.o
 COBJS-y += serial_sh.o
+COBJS-y += serial_wbuart.o
 COBJS-y += usbtty.o
 
 COBJS	:= $(COBJS-y)
diff --git a/drivers/serial/serial_wbuart.c b/drivers/serial/serial_wbuart.c
new file mode 100644
index 0000000..a13ef2a
--- /dev/null
+++ b/drivers/serial/serial_wbuart.c
@@ -0,0 +1,73 @@
+/*
+ * (C) Copyright 2008 OpenPattern SARL
+ *
+ * Florian Fainelli <florian.fainelli@openpattern.org>
+ *
+ * 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 as
+ * published by the Free Software Foundation; either version 2 of
+ * the License, or (at your option) any later version.
+ *
+ * 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.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
+ * MA 02111-1307 USA
+ */
+
+#include <config.h>
+
+#ifdef	CONFIG_WB_UART
+
+#include <asm/serial_wbuart.h>
+
+#define IO_WORD(offset)		(*(volatile unsigned long *)(offset))
+#define IO_SERIAL(offset)	IO_WORD(CONFIG_SERIAL_BASE + (offset))
+
+#define IO_SERIAL_RXTX		IO_SERIAL(WUB_RXTX_OFFSET)
+#define IO_SERIAL_UCR		IO_SERIAL(WUB_UCR_OFFSET)
+
+int serial_init(void)
+{
+	/* FIXME: Nothing for now. We should initialize fifo, etc */
+	return 0;
+}
+
+void serial_setbrg(void)
+{
+	/* FIXME: what's this for? */
+}
+
+void serial_putc(const char c)
+{
+	if (c == '\n') serial_putc('\r');
+	while(IO_SERIAL_UCR & WUB_BUSY);
+	IO_SERIAL_RXTX = c;
+}
+
+void serial_puts(const char * s)
+{
+	while (*s) {
+		serial_putc(*s++);
+	}
+}
+
+int serial_getc(void)
+{
+	while(!(IO_SERIAL_UCR & WUB_DR));
+	return IO_SERIAL_RXTX;
+}
+
+int serial_tstc(void)
+{
+	return 0;
+}
+
+#endif	/* CONFIG_WB_UART */
diff --git a/include/asm-microblaze/arch-microblaze/wbuart_l.h b/include/asm-microblaze/arch-microblaze/wbuart_l.h
new file mode 100644
index 0000000..cf4b90e
--- /dev/null
+++ b/include/asm-microblaze/arch-microblaze/wbuart_l.h
@@ -0,0 +1,15 @@
+/*
+ * Wishbone UART low-level definitions
+ */
+
+#ifndef WBUART_L_H
+#define WUBART_L_H
+
+#define WUB_UCR_OFFSET		0x0
+#define WUB_RXTX_OFFSET		0x4
+
+#define WUB_DR			0x01
+#define WUB_ERR			0x02
+#define WUB_BUSY		0x10
+
+#endif /* WBUART_L_H */
diff --git a/include/asm-microblaze/serial_wbuart.h b/include/asm-microblaze/serial_wbuart.h
new file mode 100644
index 0000000..089d19b
--- /dev/null
+++ b/include/asm-microblaze/serial_wbuart.h
@@ -0,0 +1,25 @@
+/*
+ * (C) Copyright 2008 OpenPattern SARL
+ *
+ * Florian Fainelli <florian.fainelli@openpattern.org>
+ *
+ * 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 as
+ * published by the Free Software Foundation; either version 2 of
+ * the License, or (at your option) any later version.
+ *
+ * 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.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
+ * MA 02111-1307 USA
+ */
+
+#include <asm/arch/wbuart_l.h>