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/*

 *  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.

 *

 *  $Id: ns16550_p.h,v 1.2 2001-09-27 12:01:42 chris Exp $

 */

#ifndef _NS16550_P_H_

#define _NS16550_P_H_

#ifdef __cplusplus

extern "C" {

#endif

/*

 *  Define NS16550_STATIC to nothing while debugging so the entry points

 *  will show up in the symbol table.

 */

#define NS16550_STATIC

/* #define NS16550_STATIC static */

/*

 * 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 NS16550_RECEIVE_BUFFER   0

#define NS16550_INTERRUPT_ENABLE 1

#define NS16550_INTERRUPT_ID     2

#define NS16550_LINE_CONTROL     3

#define NS16550_MODEM_CONTROL    4

#define NS16550_LINE_STATUS      5

#define NS16550_MODEM_STATUS     6

#define NS16550_SCRATCH_PAD      7

/*

 * 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 NS16550_TRANSMIT_BUFFER  0

#define NS16550_FIFO_CONTROL     2

/*

 * 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 NS16550_ENABLE_ALL_INTR           (SP_INT_RX_ENABLE | SP_INT_TX_ENABLE)

#define NS16550_DISABLE_ALL_INTR          0x00

#define NS16550_ENABLE_ALL_INTR_EXCEPT_TX (SP_INT_RX_ENABLE)

/*

 * 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(_clock, _baud_rate) \

  ((((_clock) == 0) ? 115200 : (_clock))/(_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

 */

NS16550_STATIC boolean ns16550_probe(int minor);

NS16550_STATIC void ns16550_init(int minor);

NS16550_STATIC int ns16550_open(

  int major,

  int minor,

  void  * arg

);

NS16550_STATIC int ns16550_close(

  int major,

  int minor,

  void  * arg

);

NS16550_STATIC void ns16550_write_polled(

  int   minor,

  char  cChar

);

NS16550_STATIC int ns16550_assert_RTS(

  int minor

);

NS16550_STATIC int ns16550_negate_RTS(

  int minor

);

NS16550_STATIC int ns16550_assert_DTR(

  int minor

);

NS16550_STATIC int ns16550_negate_DTR(

  int minor

);

NS16550_STATIC void ns16550_initialize_interrupts(int minor);

NS16550_STATIC int ns16550_write_support_int(

  int   minor,

  const char *buf,

  int   len

);

NS16550_STATIC int ns16550_write_support_polled(

  int   minor,

  const char *buf,

  int   len

  );

NS16550_STATIC int ns16550_inbyte_nonblocking_polled(

  int minor

);

NS16550_STATIC void ns16550_enable_interrupts(

  int minor,

  int mask

);

NS16550_STATIC int ns16550_set_attributes(

  int                   minor,

  const struct termios *t

);

#ifdef __cplusplus

}

#endif

#endif /* _NS16550_P_H_ */