source: SVN/rincon/u-boot/board/Marvell/common/ns16550.c @ 55

Last change on this file since 55 was 55, checked in by Tim Harvey, 22 months ago

rincon: added latest u-boot source

restored form server backup

Signed-off-by: Tim Harvey <tharvey@…>

File size: 1.8 KB
Line 
1/*
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 * further modified by Josh Huber <huber@mclx.com> to support
7 * the DUART on the Galileo Eval board. (db64360)
8 */
9
10#include <config.h>
11#include "ns16550.h"
12
13#ifdef ZUMA_NTL
14/* no 16550 device */
15#else
16const NS16550_t COM_PORTS[] = { (NS16550_t) (CFG_DUART_IO + 0),
17        (NS16550_t) (CFG_DUART_IO + 0x20)
18};
19
20volatile struct NS16550 *NS16550_init (int chan, int baud_divisor)
21{
22        volatile struct NS16550 *com_port;
23
24        com_port = (struct NS16550 *) COM_PORTS[chan];
25        com_port->ier = 0x00;
26        com_port->lcr = LCR_BKSE;       /* Access baud rate */
27        com_port->dll = baud_divisor & 0xff;    /* 9600 baud */
28        com_port->dlm = (baud_divisor >> 8) & 0xff;
29        com_port->lcr = LCR_8N1;        /* 8 data, 1 stop, no parity */
30        com_port->mcr = MCR_DTR | MCR_RTS;      /* RTS/DTR */
31
32        /* Clear & enable FIFOs */
33        com_port->fcr = FCR_FIFO_EN | FCR_RXSR | FCR_TXSR;
34        return (com_port);
35}
36
37void NS16550_reinit (volatile struct NS16550 *com_port, int baud_divisor)
38{
39        com_port->ier = 0x00;
40        com_port->lcr = LCR_BKSE;       /* Access baud rate */
41        com_port->dll = baud_divisor & 0xff;    /* 9600 baud */
42        com_port->dlm = (baud_divisor >> 8) & 0xff;
43        com_port->lcr = LCR_8N1;        /* 8 data, 1 stop, no parity */
44        com_port->mcr = MCR_DTR | MCR_RTS;      /* RTS/DTR */
45
46        /* Clear & enable FIFOs */
47        com_port->fcr = FCR_FIFO_EN | FCR_RXSR | FCR_TXSR;
48}
49
50void NS16550_putc (volatile struct NS16550 *com_port, unsigned char c)
51{
52        while ((com_port->lsr & LSR_THRE) == 0);
53        com_port->thr = c;
54}
55
56unsigned char NS16550_getc (volatile struct NS16550 *com_port)
57{
58        while ((com_port->lsr & LSR_DR) == 0);
59        return (com_port->rbr);
60}
61
62int NS16550_tstc (volatile struct NS16550 *com_port)
63{
64        return ((com_port->lsr & LSR_DR) != 0);
65}
66#endif
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