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/*
* NS16550 Serial Port
* originally from linux source (arch/ppc/boot/ns16550.h)
* modified slightly to
* have addresses as offsets from CFG_ISA_BASE
* added a few more definitions
* added prototypes for ns16550.c
* reduced no of com ports to 2
* modifications (c) Rob Taylor, Flying Pig Systems. 2000.
*
* further modified to support the DUART in the Galileo eval board
* modifications (c) Josh Huber <huber@mclx.com>, Mission Critical Linux, Inc.
*/
#ifndef __NS16550_H__
#define __NS16550_H__
/* the padding is necessary because on the galileo board the UART is
wired in with the 3 address lines shifted over by 2 bits */
struct NS16550
{
unsigned char rbr; /* 0 = 0-3*/
int pad1:24;
unsigned char ier; /* 1 = 4-7*/
int pad2:24;
unsigned char fcr; /* 2 = 8-b*/
int pad3:24;
unsigned char lcr; /* 3 = c-f*/
int pad4:24;
unsigned char mcr; /* 4 = 10-13*/
int pad5:24;
unsigned char lsr; /* 5 = 14-17*/
int pad6:24;
unsigned char msr; /* 6 =18-1b*/
int pad7:24;
unsigned char scr; /* 7 =1c-1f*/
int pad8:24;
} __attribute__ ((packed));
/* aliases */
#define thr rbr
#define iir fcr
#define dll rbr
#define dlm ier
#define FCR_FIFO_EN 0x01 /*fifo enable*/
#define FCR_RXSR 0x02 /*reciever soft reset*/
#define FCR_TXSR 0x04 /*transmitter soft reset*/
#define MCR_DTR 0x01
#define MCR_RTS 0x02
#define MCR_DMA_EN 0x04
#define MCR_TX_DFR 0x08
#define LCR_WLS_MSK 0x03 /* character length slect mask*/
#define LCR_WLS_5 0x00 /* 5 bit character length */
#define LCR_WLS_6 0x01 /* 6 bit character length */
#define LCR_WLS_7 0x02 /* 7 bit character length */
#define LCR_WLS_8 0x03 /* 8 bit character length */
#define LCR_STB 0x04 /* Number of stop Bits, off = 1, on = 1.5 or 2) */
#define LCR_PEN 0x08 /* Parity eneble*/
#define LCR_EPS 0x10 /* Even Parity Select*/
#define LCR_STKP 0x20 /* Stick Parity*/
#define LCR_SBRK 0x40 /* Set Break*/
#define LCR_BKSE 0x80 /* Bank select enable*/
#define LSR_DR 0x01 /* Data ready */
#define LSR_OE 0x02 /* Overrun */
#define LSR_PE 0x04 /* Parity error */
#define LSR_FE 0x08 /* Framing error */
#define LSR_BI 0x10 /* Break */
#define LSR_THRE 0x20 /* Xmit holding register empty */
#define LSR_TEMT 0x40 /* Xmitter empty */
#define LSR_ERR 0x80 /* Error */
/* useful defaults for LCR*/
#define LCR_8N1 0x03
#define COM1 0x03F8
#define COM2 0x02F8
volatile struct NS16550 * NS16550_init(int chan, int baud_divisor);
void NS16550_putc(volatile struct NS16550 *com_port, unsigned char c);
unsigned char NS16550_getc(volatile struct NS16550 *com_port);
int NS16550_tstc(volatile struct NS16550 *com_port);
void NS16550_reinit(volatile struct NS16550 *com_port, int baud_divisor);
typedef struct NS16550 *NS16550_t;
extern const NS16550_t COM_PORTS[];
#endif
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