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wdenke85390d2002-04-01 14:29:03 +00001/*
2 * COM1 NS16550 support
3 * originally from linux source (arch/ppc/boot/ns16550.c)
4 * modified to use CFG_ISA_MEM and new defines
5 */
6
7#include <config.h>
8
9#ifdef CFG_NS16550
10
11#include <ns16550.h>
12
13#define LCRVAL LCR_8N1 /* 8 data, 1 stop, no parity */
14#define MCRVAL (MCR_DTR | MCR_RTS) /* RTS/DTR */
15#define FCRVAL (FCR_FIFO_EN | FCR_RXSR | FCR_TXSR) /* Clear & enable FIFOs */
16
17void NS16550_init (NS16550_t com_port, int baud_divisor)
18{
19 com_port->ier = 0x00;
20 com_port->lcr = LCR_BKSE | LCRVAL;
21 com_port->dll = baud_divisor & 0xff;
22 com_port->dlm = (baud_divisor >> 8) & 0xff;
23 com_port->lcr = LCRVAL;
24 com_port->mcr = MCRVAL;
25 com_port->fcr = FCRVAL;
26}
27
28void NS16550_reinit (NS16550_t com_port, int baud_divisor)
29{
30 com_port->ier = 0x00;
31 com_port->lcr = LCR_BKSE;
32 com_port->dll = baud_divisor & 0xff;
33 com_port->dlm = (baud_divisor >> 8) & 0xff;
34 com_port->lcr = LCRVAL;
35 com_port->mcr = MCRVAL;
36 com_port->fcr = FCRVAL;
37}
38
39void NS16550_putc (NS16550_t com_port, char c)
40{
41 while ((com_port->lsr & LSR_THRE) == 0);
42 com_port->thr = c;
43}
44
45char NS16550_getc (NS16550_t com_port)
46{
47 while ((com_port->lsr & LSR_DR) == 0);
48 return (com_port->rbr);
49}
50
51int NS16550_tstc (NS16550_t com_port)
52{
53 return ((com_port->lsr & LSR_DR) != 0);
54}
55
56#endif