3 * originally from linux source (arch/ppc/boot/ns16550.h)
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.
11 * further modified to support the DUART in the Galileo eval board
12 * modifications (c) Josh Huber <huber@mclx.com>, Mission Critical Linux, Inc.
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 */
22 unsigned char rbr; /* 0 = 0-3*/
25 unsigned char ier; /* 1 = 4-7*/
28 unsigned char fcr; /* 2 = 8-b*/
31 unsigned char lcr; /* 3 = c-f*/
34 unsigned char mcr; /* 4 = 10-13*/
37 unsigned char lsr; /* 5 = 14-17*/
40 unsigned char msr; /* 6 =18-1b*/
43 unsigned char scr; /* 7 =1c-1f*/
45 } __attribute__ ((packed));
53 #define FCR_FIFO_EN 0x01 /*fifo enable*/
54 #define FCR_RXSR 0x02 /*reciever soft reset*/
55 #define FCR_TXSR 0x04 /*transmitter soft reset*/
60 #define MCR_DMA_EN 0x04
61 #define MCR_TX_DFR 0x08
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*/
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 */
85 /* useful defaults for LCR*/
92 volatile struct NS16550 * NS16550_init(int chan, int baud_divisor);
93 void NS16550_putc(volatile struct NS16550 *com_port, unsigned char c);
94 unsigned char NS16550_getc(volatile struct NS16550 *com_port);
95 int NS16550_tstc(volatile struct NS16550 *com_port);
96 void NS16550_reinit(volatile struct NS16550 *com_port, int baud_divisor);
98 typedef struct NS16550 *NS16550_t;
100 extern const NS16550_t COM_PORTS[];