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/*

 *  This file contains the template for a console IO package.

 *

 *  COPYRIGHT (c) 1989-1999.

 *  On-Line Applications Research Corporation (OAR).

 *

 *  The license and distribution terms for this file may be

 *  found in the file LICENSE in this distribution or at

 *  http://www.OARcorp.com/rtems/license.html.

 *

 *  This file adapted from no_bsp board library of the RTEMS distribution.

 *  The body has been modified for the Bender Or1k implementation by

 *  Chris Ziomkowski. <chris@asics.ws>

 */

#define BENDER_INIT

#include <bsp.h>

#include <rtems/libio.h>

#include "console.h"

static int localEcho;

static UART_16450* uart = (UART_16450*)0x80000000;  /* This is where the simulator puts it */

/*  console_initialize

 *

 *  This routine initializes the console IO driver.

 *

 *  Input parameters: NONE

 *

 *  Output parameters:  NONE

 *

 *  Return values:

 */

void (*old_handler)(unsigned int,unsigned int,unsigned int,unsigned int);

void console_interrupt(unsigned int vector,unsigned int pc,

                       unsigned int effective_addr, unsigned int status)

{

  int reason;

  register int pending;

  /* First thing's first...is this for us? */

  asm volatile ("l.mfspr %0,r0,0x4802 \n\t"  /* Read the PIC status */

                "l.andi  %0,%0,0x4    \n\t" : "=r" (pending));

  if(pending)

    {

      reason = uart->read.IIR;

      switch(reason)

        {

        case 0: /* Interrupt because of modem status */

          break;

        case 2: /* Interrupt because Transmitter empty */

          break;

        case 4: /* Interrupt because Received data available */

          break;

        case 6: /* Interrupt because Status Register */

          break;

        case 12: /* Interrupt because of character timeout (16550 only) */

          break;

        default: /* No interrupt */

          break;

        }

    }

  if(old_handler)

    (*old_handler)(vector,pc,effective_addr,status);

}

rtems_device_driver console_initialize(

  rtems_device_major_number  major,

  rtems_device_minor_number  minor,

  void                      *arg

)

{

  rtems_status_code status;

  int tmp,tmp2;

  unsigned32 sr;

  extern unsigned32 Or1k_Interrupt_Vectors[16];

  /* Make sure the UART (interrupt 2) is enabled and

     reports a low prority interrupt */

  asm volatile ("l.mfspr %0,r0,0x4800  \n\t"  /* Get the PIC mask */

                "l.ori   %0,%0,0x4     \n\t"  /* Enable int 2 */

                "l.mtspr r0,%0,0x4800  \n\t"  /* Write back mask */

                "l.mfspr %0,r0,0x4801  \n\t"  /* Get priority mask */

                "l.addi  %1,r0,-5      \n\t"

                "l.and   %0,%0,%1      \n\t"  /* Set us to low */

                "l.mtspr r0,%0,0x4801  \n\t"  /* Write back to PICPR */

                : "=r" (tmp), "=r" (tmp2));

  /* Install the interrupt handler */

  asm volatile ("l.mfspr %0,r0,0x11 \n\t"

                "l.addi  %1,r0,-5   \n\t"

                "l.and   %1,%1,%0   \n\t"

                "l.mtspr r0,%1,0x11 \n\t": "=&r" (sr) : "r" (tmp));

  old_handler = (void(*)(unsigned int,unsigned int,unsigned int,unsigned int))

    Or1k_Interrupt_Vectors[5];

  Or1k_Interrupt_Vectors[5] = (unsigned32)console_interrupt;

  asm volatile ("l.mtspr r0,%0,0x11\n\t":: "r" (sr));

  /* Assume 1843.2/16 kHz clock */

  uart->latch.LCR = 0x80;    /* Set the divisor latch bit */

  uart->latch.DLM = 2;       /* 57,600 */

  uart->latch.DLL = 0;

  uart->write.LCR = 0x03;    /* 8-N-1 */

  uart->write.MCR = 0x03;    /* Assert RTS & DTR */

  /* uart->write.FCR = 0x00; */ /* Make sure we're in 16450 mode... Ignore for 16450 driver */

  uart->write.IER = 0x05;    /* Don't worry about TEMT unless we need to. */

  tmp = uart->read.LSR;     /* Make sure interrupts are cleared */

  tmp = uart->read.RBR;     /* Clear the input buffer */

  tmp = uart->read.MSR;     /* Clear the modem status register */

  localEcho = 1;       /* Turn on local echo */

  status = rtems_io_register_name(

    "/dev/console",

    major,

    (rtems_device_minor_number) 0

  );

  if (status != RTEMS_SUCCESSFUL)

    rtems_fatal_error_occurred(status);

  return RTEMS_SUCCESSFUL;

}

/*  is_character_ready

 *

 *  This routine returns TRUE if a character is available.

 *

 *  Input parameters: NONE

 *

 *  Output parameters:  NONE

 *

 *  Return values:

 */

rtems_boolean is_character_ready(

  char *ch

)

{

  *ch = '\0';   /* return NULL for no particular reason */

  return(TRUE);

}

/*  inbyte

 *

 *  This routine reads a character from the SOURCE.

 *

 *  Input parameters: NONE

 *

 *  Output parameters:  NONE

 *

 *  Return values:

 *    character read from SOURCE

 */

char inbyte( void )

{

  unsigned int stat;

  stat = uart->read.LSR;

  while(!(stat & 0x01))  /* ! Data Ready */

    {

      rtems_task_wake_after( RTEMS_YIELD_PROCESSOR );

      stat = uart->read.LSR;

    }

  return uart->read.RBR;   /* Return the character */

}

/*  outbyte

 *

 *  This routine transmits a character out the SOURCE.  Flow

 *  control is not currently enabled.

 *

 *  Input parameters:

 *    ch  - character to be transmitted

 *

 *  Output parameters:  NONE

 */

void outbyte(char ch)

{

  unsigned int stat;

  /*

   *  Carriage Return/New line translation.

   */

  stat = uart->read.LSR;

  while(!(stat & 0x40))  /* ! TEMT */

    {

      rtems_task_wake_after( RTEMS_YIELD_PROCESSOR );

      stat = uart->read.LSR;

    }

  uart->write.THR = ch;

  if ( ch == '\n' )

    outbyte( '\r' );

}

/*

 *  Open entry point

 */

rtems_device_driver console_open(

  rtems_device_major_number major,

  rtems_device_minor_number minor,

  void                    * arg

)

{

  return RTEMS_SUCCESSFUL;

}

/*

 *  Close entry point

 */

rtems_device_driver console_close(

  rtems_device_major_number major,

  rtems_device_minor_number minor,

  void                    * arg

)

{

  return RTEMS_SUCCESSFUL;

}

/*

 * read bytes from the serial port. We only have stdin.

 */

rtems_device_driver console_read(

  rtems_device_major_number major,

  rtems_device_minor_number minor,

  void                    * arg

)

{

  rtems_libio_rw_args_t *rw_args;

  char *buffer;

  int maximum;

  int count = 0;

  rw_args = (rtems_libio_rw_args_t *) arg;

  buffer = rw_args->buffer;

  maximum = rw_args->count;

  for (count = 0; count < maximum; count++)

    {

      buffer[ count ] = inbyte();

      if (buffer[ count ] == '\n' || buffer[ count ] == '\r')

        {

          buffer[ count++ ]  = '\n';

          if(localEcho)

            outbyte('\n' ); /* newline */

          break;  /* Return for a newline */

        }

      else if (buffer[ count ] == '\b' && count > 0 )

        {

          if(localEcho)

            {

              outbyte('\b' ); /* move back one space */

              outbyte(' ' ); /* erase the character */

              outbyte('\b' ); /* move back one space */

            }

          count-=2;

        }

      else if(localEcho)

        outbyte(buffer[ count ]); /* echo the character */

    }

  rw_args->bytes_moved = count;

  return (count >= 0) ? RTEMS_SUCCESSFUL : RTEMS_UNSATISFIED;

}

/*

 * write bytes to the serial port. Stdout and stderr are the same.

 */

rtems_device_driver console_write(

  rtems_device_major_number major,

  rtems_device_minor_number minor,

  void                    * arg

)

{

  int count;

  int maximum;

  rtems_libio_rw_args_t *rw_args;

  char *buffer;

  rw_args = (rtems_libio_rw_args_t *) arg;

  buffer = rw_args->buffer;

  maximum = rw_args->count;

  for (count = 0; count < maximum; count++) {

    if ( buffer[ count ] == '\n') {

      outbyte('\r');

    }

    outbyte( buffer[ count ] );

  }

  rw_args->bytes_moved = maximum;

  return 0;

}

/*

 *  IO Control entry point

 */

rtems_device_driver console_control(

  rtems_device_major_number major,

  rtems_device_minor_number minor,

  void                    * arg

)

{

  int param,div;

  ConsoleIOCTLRequest* request = (ConsoleIOCTLRequest*)arg;

  if (!arg)

    return RTEMS_INVALID_ADDRESS;

  switch(request->command)

    {

    case TERM_LOCAL_ECHO:

      param = (int)(request->data);

      if(param < 0 || param > 1)

        return RTEMS_INVALID_NUMBER;

      localEcho = param;

      break;

    case TERM_BIT_RATE:

      param = (int)(request->data);

      switch(param)

        {

        case 50:

        case 150:

        case 300:

        case 600:

        case 1200:

        case 1800:

        case 2000:

        case 2400:

        case 3600:

        case 4800:

        case 7200:

        case 9600:

        case 19200:

        case 38400:

        case 57600:

        case 115200:

          div = 115200/param;

          uart->latch.LCR |= 0x80;    /* Set the divisor latch bit */

          uart->latch.DLM = div & 0xFF;

          uart->latch.DLL = div >> 8;

          uart->write.LCR &= 0x7F;    /* Clear the divisor latch bit */

          break;

        default:

          return RTEMS_INVALID_NUMBER;

        }

      break;

    default:

      return RTEMS_NOT_CONFIGURED;

    }

  return RTEMS_SUCCESSFUL;

}