From 86464aed71025541805e7b1515541aee89879e33 Mon Sep 17 00:00:00 2001
From: Ralf Baechle <ralf@linux-mips.org>
Date: Mon, 15 Feb 1999 02:15:32 +0000
Subject: Merge with Linux 2.2.1.

---
 arch/ppc/boot/ns16550.c | 56 +++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 56 insertions(+)
 create mode 100644 arch/ppc/boot/ns16550.c

(limited to 'arch/ppc/boot/ns16550.c')

diff --git a/arch/ppc/boot/ns16550.c b/arch/ppc/boot/ns16550.c
new file mode 100644
index 000000000..db0b94d03
--- /dev/null
+++ b/arch/ppc/boot/ns16550.c
@@ -0,0 +1,56 @@
+/*
+ * COM1 NS16550 support
+ */
+
+#include "ns16550.h"
+typedef struct NS16550 *NS16550_t;
+
+const NS16550_t COM_PORTS[] = { (NS16550_t) COM1,
+    (NS16550_t) COM2,
+    (NS16550_t) COM3,
+    (NS16550_t) COM4 };
+
+volatile struct NS16550 *
+NS16550_init(int chan)
+{
+ volatile struct NS16550 *com_port;
+ volatile unsigned char xx;
+ com_port = (struct NS16550 *) COM_PORTS[chan];
+ /* See if port is present */
+ com_port->lcr = 0x00;
+ com_port->ier = 0xFF;
+#if 0
+ if (com_port->ier != 0x0F) return ((struct NS16550 *)0);
+#endif
+ com_port->ier = 0x00;
+ com_port->lcr = 0x80;  /* Access baud rate */
+ com_port->dll = 0xc;  /* 9600 baud */
+ com_port->dlm = 0xc >> 8;
+ com_port->lcr = 0x03;  /* 8 data, 1 stop, no parity */
+ com_port->mcr = 0x03;  /* RTS/DTR */
+ com_port->fcr = 0x07;  /* Clear & enable FIFOs */
+ return (com_port);
+}
+
+
+NS16550_putc(volatile struct NS16550 *com_port, unsigned char c)
+{
+ volatile int i;
+ while ((com_port->lsr & LSR_THRE) == 0) ;
+ com_port->thr = c;
+}
+
+unsigned char
+NS16550_getc(volatile struct NS16550 *com_port)
+{
+ while ((com_port->lsr & LSR_DR) == 0) ;
+ return (com_port->rbr);
+}
+
+NS16550_tstc(volatile struct NS16550 *com_port)
+{
+ return ((com_port->lsr & LSR_DR) != 0);
+}
+
+
+
-- 
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