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wdenk717b5aa2002-04-27 11:09:31 +00001/*
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
12#if (CFG_NS16550_REG_SIZE == 1)
13struct NS16550 {
14 unsigned char rbr; /* 0 */
15 unsigned char ier; /* 1 */
16 unsigned char fcr; /* 2 */
17 unsigned char lcr; /* 3 */
18 unsigned char mcr; /* 4 */
19 unsigned char lsr; /* 5 */
20 unsigned char msr; /* 6 */
21 unsigned char scr; /* 7 */
22} __attribute__ ((packed));
23#elif (CFG_NS16550_REG_SIZE == 2)
24struct NS16550 {
25 unsigned short rbr; /* 0 */
26 unsigned short ier; /* 1 */
27 unsigned short fcr; /* 2 */
28 unsigned short lcr; /* 3 */
29 unsigned short mcr; /* 4 */
30 unsigned short lsr; /* 5 */
31 unsigned short msr; /* 6 */
32 unsigned short scr; /* 7 */
33} __attribute__ ((packed));
34#elif (CFG_NS16550_REG_SIZE == 4)
35struct NS16550 {
36 unsigned long rbr; /* 0 */
37 unsigned long ier; /* 1 */
38 unsigned long fcr; /* 2 */
39 unsigned long lcr; /* 3 */
40 unsigned long mcr; /* 4 */
41 unsigned long lsr; /* 5 */
42 unsigned long msr; /* 6 */
43 unsigned long scr; /* 7 */
44} __attribute__ ((packed));
45#elif (CFG_NS16550_REG_SIZE == -4)
46struct NS16550 {
47 unsigned char rbr; /* 0 */
48 int pad1:24;
49 unsigned char ier; /* 1 */
50 int pad2:24;
51 unsigned char fcr; /* 2 */
52 int pad3:24;
53 unsigned char lcr; /* 3 */
54 int pad4:24;
55 unsigned char mcr; /* 4 */
56 int pad5:24;
57 unsigned char lsr; /* 5 */
58 int pad6:24;
59 unsigned char msr; /* 6 */
60 int pad7:24;
61 unsigned char scr; /* 7 */
62 int pad8:24;
63} __attribute__ ((packed));
64#else
65#error "Please define NS16550 registers size."
66#endif
67
68#define thr rbr
69#define iir fcr
70#define dll rbr
71#define dlm ier
72
73typedef volatile struct NS16550 *NS16550_t;
74
75#define FCR_FIFO_EN 0x01 /* Fifo enable */
76#define FCR_RXSR 0x02 /* Receiver soft reset */
77#define FCR_TXSR 0x04 /* Transmitter soft reset */
78
79#define MCR_DTR 0x01
80#define MCR_RTS 0x02
81#define MCR_DMA_EN 0x04
82#define MCR_TX_DFR 0x08
83
84#define LCR_WLS_MSK 0x03 /* character length slect mask */
85#define LCR_WLS_5 0x00 /* 5 bit character length */
86#define LCR_WLS_6 0x01 /* 6 bit character length */
87#define LCR_WLS_7 0x02 /* 7 bit character length */
88#define LCR_WLS_8 0x03 /* 8 bit character length */
89#define LCR_STB 0x04 /* Number of stop Bits, off = 1, on = 1.5 or 2) */
90#define LCR_PEN 0x08 /* Parity eneble */
91#define LCR_EPS 0x10 /* Even Parity Select */
92#define LCR_STKP 0x20 /* Stick Parity */
93#define LCR_SBRK 0x40 /* Set Break */
94#define LCR_BKSE 0x80 /* Bank select enable */
95
96#define LSR_DR 0x01 /* Data ready */
97#define LSR_OE 0x02 /* Overrun */
98#define LSR_PE 0x04 /* Parity error */
99#define LSR_FE 0x08 /* Framing error */
100#define LSR_BI 0x10 /* Break */
101#define LSR_THRE 0x20 /* Xmit holding register empty */
102#define LSR_TEMT 0x40 /* Xmitter empty */
103#define LSR_ERR 0x80 /* Error */
104
105/* useful defaults for LCR */
106#define LCR_8N1 0x03
107
108void NS16550_init (NS16550_t com_port, int baud_divisor);
109void NS16550_putc (NS16550_t com_port, char c);
110char NS16550_getc (NS16550_t com_port);
111int NS16550_tstc (NS16550_t com_port);
112void NS16550_reinit (NS16550_t com_port, int baud_divisor);