patch-2.2.0-pre6 linux/arch/ppc/boot/ns16550.c

• Lines: 57
• Date: Thu Jan 7 12:06:57 1999
• Orig file: v2.2.0-pre5/linux/arch/ppc/boot/ns16550.c
• Orig date: Wed Dec 31 16:00:00 1969

diff -u --recursive --new-file v2.2.0-pre5/linux/arch/ppc/boot/ns16550.c linux/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);
+}
+
+
+