source: SVN/rincon/u-boot/board/Marvell/common/ns16550.h @ 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: 2.9 KB
Line 
1/*
2 * NS16550 Serial Port
3 * originally from linux source (arch/ppc/boot/ns16550.h)
4 * modified slightly to
5 * have addresses as offsets from CFG_ISA_BASE
6 * added a few more definitions
7 * added prototypes for ns16550.c
8 * reduced no of com ports to 2
9 * modifications (c) Rob Taylor, Flying Pig Systems. 2000.
10 *
11 * further modified to support the DUART in the Galileo eval board
12 * modifications (c) Josh Huber <huber@mclx.com>, Mission Critical Linux, Inc.
13 */
14
15#ifndef __NS16550_H__
16#define __NS16550_H__
17
18/* the padding is necessary because on the galileo board the UART is
19   wired in with the 3 address lines shifted over by 2 bits */
20struct NS16550
21{
22        unsigned char rbr;  /* 0 = 0-3*/
23        int pad1:24;
24
25        unsigned char ier;  /* 1 = 4-7*/
26        int pad2:24;
27
28        unsigned char fcr;  /* 2 = 8-b*/
29        int pad3:24;
30
31        unsigned char lcr;  /* 3 = c-f*/
32        int pad4:24;
33
34        unsigned char mcr;  /* 4 = 10-13*/
35        int pad5:24;
36
37        unsigned char lsr;  /* 5 = 14-17*/
38        int pad6:24;
39
40        unsigned char msr;  /* 6 =18-1b*/
41        int pad7:24;
42
43        unsigned char scr;  /* 7 =1c-1f*/
44        int pad8:24;
45} __attribute__ ((packed));
46
47/* aliases */
48#define thr rbr
49#define iir fcr
50#define dll rbr
51#define dlm ier
52
53#define FCR_FIFO_EN     0x01    /*fifo enable*/
54#define FCR_RXSR        0x02    /*reciever soft reset*/
55#define FCR_TXSR        0x04    /*transmitter soft reset*/
56
57
58#define MCR_DTR         0x01
59#define MCR_RTS         0x02
60#define MCR_DMA_EN      0x04
61#define MCR_TX_DFR      0x08
62
63
64#define LCR_WLS_MSK 0x03    /* character length slect mask*/
65#define LCR_WLS_5   0x00    /* 5 bit character length */
66#define LCR_WLS_6   0x01    /* 6 bit character length */
67#define LCR_WLS_7   0x02    /* 7 bit character length */
68#define LCR_WLS_8   0x03    /* 8 bit character length */
69#define LCR_STB     0x04    /* Number of stop Bits, off = 1, on = 1.5 or 2) */
70#define LCR_PEN     0x08    /* Parity eneble*/
71#define LCR_EPS     0x10    /* Even Parity Select*/
72#define LCR_STKP    0x20    /* Stick Parity*/
73#define LCR_SBRK    0x40    /* Set Break*/
74#define LCR_BKSE    0x80    /* Bank select enable*/
75
76#define LSR_DR      0x01    /* Data ready */
77#define LSR_OE      0x02    /* Overrun */
78#define LSR_PE      0x04    /* Parity error */
79#define LSR_FE      0x08    /* Framing error */
80#define LSR_BI      0x10    /* Break */
81#define LSR_THRE    0x20    /* Xmit holding register empty */
82#define LSR_TEMT    0x40    /* Xmitter empty */
83#define LSR_ERR     0x80    /* Error */
84
85/* useful defaults for LCR*/
86#define LCR_8N1     0x03
87
88
89#define COM1 0x03F8
90#define COM2 0x02F8
91
92volatile struct NS16550 * NS16550_init(int chan, int baud_divisor);
93void NS16550_putc(volatile struct NS16550 *com_port, unsigned char c);
94unsigned char NS16550_getc(volatile struct NS16550 *com_port);
95int NS16550_tstc(volatile struct NS16550 *com_port);
96void NS16550_reinit(volatile struct NS16550 *com_port, int baud_divisor);
97
98typedef struct NS16550 *NS16550_t;
99
100extern const NS16550_t COM_PORTS[];
101
102#endif
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