/*
* COPYRIGHT (c) 1998 by Radstone Technology
*
*
* THIS FILE IS PROVIDED TO YOU, THE USER, "AS IS", WITHOUT WARRANTY OF ANY
* KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTY OF FITNESS FOR A PARTICULAR PURPOSE. THE ENTIRE RISK
* AS TO THE QUALITY AND PERFORMANCE OF ALL CODE IN THIS FILE IS WITH YOU.
*
* You are hereby granted permission to use, copy, modify, and distribute
* this file, provided that this notice, plus the above copyright notice
* and disclaimer, appears in all copies. Radstone Technology will provide
* no support for this code.
*
*/
#ifndef _NS16550_P_H_
#define _NS16550_P_H_
#ifdef __cplusplus
extern "C" {
#endif
/*
* Define serial port read registers structure.
*/
typedef volatile struct _SP_READ_REGISTERS {
unsigned char ReceiveBuffer;
unsigned char InterruptEnable;
unsigned char InterruptId;
unsigned char LineControl;
unsigned char ModemControl;
unsigned char LineStatus;
unsigned char ModemStatus;
unsigned char ScratchPad;
} SP_READ_REGISTERS, *PSP_READ_REGISTERS;
/*
* Define serial port write registers structure.
*/
typedef volatile struct _SP_WRITE_REGISTERS {
unsigned char TransmitBuffer;
unsigned char InterruptEnable;
unsigned char FifoControl;
unsigned char LineControl;
unsigned char ModemControl;
unsigned char Reserved1;
unsigned char ModemStatus;
unsigned char ScratchPad;
} SP_WRITE_REGISTERS, *PSP_WRITE_REGISTERS;
/*
* Define serial port interrupt enable register structure.
*/
#define SP_INT_RX_ENABLE 0x01
#define SP_INT_TX_ENABLE 0x02
#define SP_INT_LS_ENABLE 0x04
#define SP_INT_MS_ENABLE 0x08
/*
* Define serial port interrupt id register structure.
*/
typedef struct _SP_INTERRUPT_ID {
unsigned char InterruptPending : 1;
unsigned char Identification : 3;
unsigned char Reserved1 : 2;
unsigned char FifoEnabled : 2;
} SP_INTERRUPT_ID, *PSP_INTERRUPT_ID;
/*
* Define serial port fifo control register structure.
*/
#define SP_FIFO_ENABLE 0x01
#define SP_FIFO_RXRST 0x02
#define SP_FIFO_TXRST 0x04
#define SP_FIFO_DMA 0x08
#define SP_FIFO_RXLEVEL 0xc0
/*
* Define serial port line control register structure.
*/
#define SP_LINE_SIZE 0x03
#define SP_LINE_STOP 0x04
#define SP_LINE_PAR 0x08
#define SP_LINE_ODD 0x10
#define SP_LINE_STICK 0x20
#define SP_LINE_BREAK 0x40
#define SP_LINE_DLAB 0x80
/*
* Line status register character size definitions.
*/
#define FIVE_BITS 0x0 /* five bits per character */
#define SIX_BITS 0x1 /* six bits per character */
#define SEVEN_BITS 0x2 /* seven bits per character */
#define EIGHT_BITS 0x3 /* eight bits per character */
/*
* Line speed divisor definition.
*/
#define NS16550_Baud(baud_rate) (115200/baud_rate)
/*
* Define serial port modem control register structure.
*/
#define SP_MODEM_DTR 0x01
#define SP_MODEM_RTS 0x02
#define SP_MODEM_IRQ 0x08
#define SP_MODEM_LOOP 0x10
#define SP_MODEM_DIV4 0x80
/*
* Define serial port line status register structure.
*/
#define SP_LSR_RDY 0x01
#define SP_LSR_EOVRUN 0x02
#define SP_LSR_EPAR 0x04
#define SP_LSR_EFRAME 0x08
#define SP_LSR_BREAK 0x10
#define SP_LSR_THOLD 0x20
#define SP_LSR_TX 0x40
#define SP_LSR_EFIFO 0x80
typedef struct _ns16550_context
{
unsigned8 ucModemCtrl;
} ns16550_context;
/*
* Driver functions
*/
static boolean ns16550_probe(int minor);
static void ns16550_init(int minor);
static int ns16550_open(
int major,
int minor,
void * arg
);
static int ns16550_close(
int major,
int minor,
void * arg
);
static void ns16550_write_polled(
int minor,
char cChar
);
static void ns16550_assert_RTS(
int minor
);
static void ns16550_negate_RTS(
int minor
);
static void ns16550_assert_DTR(
int minor
);
static void ns16550_negate_DTR(
int minor
);
static void ns16550_initialize_interrupts(int minor);
static int ns16550_flush(int major, int minor, void *arg);
static int ns16550_write_support_int(
int minor,
const char *buf,
int len
);
static int ns16550_write_support_polled(
int minor,
const char *buf,
int len
);
static int ns16550_inbyte_nonblocking_polled(
int minor
);
#ifdef __cplusplus
}
#endif
#endif /* _NS16550_P_H_ */
