]>
Commit | Line | Data |
---|---|---|
e85390dc WD |
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 | ||
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 | ||
17 | void 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 | ||
28 | void 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 | ||
39 | void NS16550_putc (NS16550_t com_port, char c) | |
40 | { | |
41 | while ((com_port->lsr & LSR_THRE) == 0); | |
42 | com_port->thr = c; | |
43 | } | |
44 | ||
45 | char NS16550_getc (NS16550_t com_port) | |
46 | { | |
47 | while ((com_port->lsr & LSR_DR) == 0); | |
48 | return (com_port->rbr); | |
49 | } | |
50 | ||
51 | int NS16550_tstc (NS16550_t com_port) | |
52 | { | |
53 | return ((com_port->lsr & LSR_DR) != 0); | |
54 | } | |
55 | ||
56 | #endif |