From 717b5aad25737f2847f6785820d21cd8d123f7d3 Mon Sep 17 00:00:00 2001
From: wdenk <wdenk>
Date: Sat, 27 Apr 2002 11:09:31 +0000
Subject: [PATCH] Initial revision

---
 examples/Makefile |  66 +++++++++++++++++++++++++++
 include/ns16550.h | 112 ++++++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 178 insertions(+)
 create mode 100644 examples/Makefile
 create mode 100644 include/ns16550.h

diff --git a/examples/Makefile b/examples/Makefile
new file mode 100644
index 0000000000..b7d6f94e40
--- /dev/null
+++ b/examples/Makefile
@@ -0,0 +1,66 @@
+#
+# (C) Copyright 2000
+# Wolfgang Denk, DENX Software Engineering, wd@denx.de.
+#
+# 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
+#
+
+LOAD_ADDR = 0x40000
+
+include $(TOPDIR)/config.mk
+
+SREC	= hello_world.srec
+
+# The following example is pretty 8xx specific...
+ifeq ($(CPU),mpc8xx)
+SREC   += timer.srec
+endif
+
+# Utility for resetting i82559 EEPROM
+ifeq ($(BOARD),oxc)
+SREC   += eepro100_eeprom.srec
+endif
+
+OBJS	= $(SREC:.srec=.o)
+
+LIB		= libsyscall.a
+LIBAOBJS= syscall.o
+LIBCOBJS=
+LIBOBJS	= $(LIBAOBJS) $(LIBCOBJS)
+
+CPPFLAGS += -I..
+
+all:	.depend $(LIB) $(SREC)
+
+#########################################################################
+$(LIB): .depend $(LIBOBJS)
+	$(AR) crv $@ $(LIBOBJS)
+
+%.srec:	%.o $(LIB)
+	$(LD) -g -Ttext $(LOAD_ADDR) -o $(<:.o=) -e $(<:.o=) $< $(LIB)
+	$(OBJCOPY) -O srec $(<:.o=) $@
+
+#########################################################################
+
+.depend:	Makefile $(OBJS:.o=.c) $(LIBCOBJS:.o=.c) $(LIBAOBJS:.o=.S)
+		$(CC) -M $(CFLAGS) $(OBJS:.o=.c) $(LIBCOBJS:.o=.c) $(LIBAOBJS:.o=.S) > $@
+
+sinclude .depend
+
+#########################################################################
diff --git a/include/ns16550.h b/include/ns16550.h
new file mode 100644
index 0000000000..b2e791a4c0
--- /dev/null
+++ b/include/ns16550.h
@@ -0,0 +1,112 @@
+/*
+ * NS16550 Serial Port
+ * originally from linux source (arch/ppc/boot/ns16550.h)
+ * modified slightly to
+ * have addresses as offsets from CFG_ISA_BASE
+ * added a few more definitions
+ * added prototypes for ns16550.c
+ * reduced no of com ports to 2
+ * modifications (c) Rob Taylor, Flying Pig Systems. 2000.
+ */
+
+#if (CFG_NS16550_REG_SIZE == 1)
+struct NS16550 {
+	unsigned char rbr;		/* 0 */
+	unsigned char ier;		/* 1 */
+	unsigned char fcr;		/* 2 */
+	unsigned char lcr;		/* 3 */
+	unsigned char mcr;		/* 4 */
+	unsigned char lsr;		/* 5 */
+	unsigned char msr;		/* 6 */
+	unsigned char scr;		/* 7 */
+} __attribute__ ((packed));
+#elif (CFG_NS16550_REG_SIZE == 2)
+struct NS16550 {
+	unsigned short rbr;		/* 0 */
+	unsigned short ier;		/* 1 */
+	unsigned short fcr;		/* 2 */
+	unsigned short lcr;		/* 3 */
+	unsigned short mcr;		/* 4 */
+	unsigned short lsr;		/* 5 */
+	unsigned short msr;		/* 6 */
+	unsigned short scr;		/* 7 */
+} __attribute__ ((packed));
+#elif (CFG_NS16550_REG_SIZE == 4)
+struct NS16550 {
+	unsigned long rbr;		/* 0 */
+	unsigned long ier;		/* 1 */
+	unsigned long fcr;		/* 2 */
+	unsigned long lcr;		/* 3 */
+	unsigned long mcr;		/* 4 */
+	unsigned long lsr;		/* 5 */
+	unsigned long msr;		/* 6 */
+	unsigned long scr;		/* 7 */
+} __attribute__ ((packed));
+#elif (CFG_NS16550_REG_SIZE == -4)
+struct NS16550 {
+	unsigned char rbr;		/* 0 */
+	int pad1:24;
+	unsigned char ier;		/* 1 */
+	int pad2:24;
+	unsigned char fcr;		/* 2 */
+	int pad3:24;
+	unsigned char lcr;		/* 3 */
+	int pad4:24;
+	unsigned char mcr;		/* 4 */
+	int pad5:24;
+	unsigned char lsr;		/* 5 */
+	int pad6:24;
+	unsigned char msr;		/* 6 */
+	int pad7:24;
+	unsigned char scr;		/* 7 */
+	int pad8:24;
+} __attribute__ ((packed));
+#else
+#error "Please define NS16550 registers size."
+#endif
+
+#define thr rbr
+#define iir fcr
+#define dll rbr
+#define dlm ier
+
+typedef volatile struct NS16550 *NS16550_t;
+
+#define FCR_FIFO_EN     0x01		/* Fifo enable */
+#define FCR_RXSR        0x02		/* Receiver soft reset */
+#define FCR_TXSR        0x04		/* Transmitter soft reset */
+
+#define MCR_DTR         0x01
+#define MCR_RTS         0x02
+#define MCR_DMA_EN      0x04
+#define MCR_TX_DFR      0x08
+
+#define LCR_WLS_MSK	0x03		/* character length slect mask */
+#define LCR_WLS_5	0x00		/* 5 bit character length */
+#define LCR_WLS_6	0x01		/* 6 bit character length */
+#define LCR_WLS_7	0x02		/* 7 bit character length */
+#define LCR_WLS_8	0x03		/* 8 bit character length */
+#define LCR_STB		0x04		/* Number of stop Bits, off = 1, on = 1.5 or 2) */
+#define LCR_PEN		0x08		/* Parity eneble */
+#define LCR_EPS		0x10		/* Even Parity Select */
+#define LCR_STKP	0x20		/* Stick Parity */
+#define LCR_SBRK	0x40		/* Set Break */
+#define LCR_BKSE	0x80		/* Bank select enable */
+
+#define LSR_DR		0x01		/* Data ready */
+#define LSR_OE		0x02		/* Overrun */
+#define LSR_PE		0x04		/* Parity error */
+#define LSR_FE		0x08		/* Framing error */
+#define LSR_BI		0x10		/* Break */
+#define LSR_THRE	0x20		/* Xmit holding register empty */
+#define LSR_TEMT	0x40		/* Xmitter empty */
+#define LSR_ERR		0x80		/* Error */
+
+/* useful defaults for LCR */
+#define LCR_8N1		0x03
+
+void	NS16550_init   (NS16550_t com_port, int baud_divisor);
+void	NS16550_putc   (NS16550_t com_port, char c);
+char	NS16550_getc   (NS16550_t com_port);
+int	NS16550_tstc   (NS16550_t com_port);
+void	NS16550_reinit (NS16550_t com_port, int baud_divisor);
-- 
2.25.1