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Commit | Line | Data |
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3a473b2a WD |
1 | /* |
2 | * COM1 NS16550 support | |
3 | * originally from linux source (arch/ppc/boot/ns16550.c) | |
6d0f6bcf | 4 | * modified to use CONFIG_SYS_ISA_MEM and new defines |
3a473b2a WD |
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 | |
6d0f6bcf JCPV |
16 | const NS16550_t COM_PORTS[] = { (NS16550_t) (CONFIG_SYS_DUART_IO + 0), |
17 | (NS16550_t) (CONFIG_SYS_DUART_IO + 0x20) | |
3a473b2a WD |
18 | }; |
19 | ||
20 | volatile 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 | ||
37 | void 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 | ||
50 | void 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 | ||
56 | unsigned char NS16550_getc (volatile struct NS16550 *com_port) | |
57 | { | |
58 | while ((com_port->lsr & LSR_DR) == 0); | |
59 | return (com_port->rbr); | |
60 | } | |
61 | ||
62 | int NS16550_tstc (volatile struct NS16550 *com_port) | |
63 | { | |
64 | return ((com_port->lsr & LSR_DR) != 0); | |
65 | } | |
66 | #endif |