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/*

    atahost.c -- ATA Host code simulation

    Copyright (C) 2002 Richard Herveille, rherveille@opencores.org

    This file is part of OpenRISC 1000 Architectural Simulator

    This program is free software; you can redistribute it and/or modify

    it under the terms of the GNU General Public License as published by

    the Free Software Foundation; either version 2 of the License, or

    (at your option) any later version

    This program is distributed in the hope that it will be useful,

    but WITHOUT ANY WARRANTY; without even the implied warranty of

    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

    GNU General Public License for more details.

    You should have received a copy of the GNU General Public License

    along with this program; if not, write to the Free Software

    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.

*/

/* get a prototype for 'register_memoryarea()                         */

#include "abstract.h"

#include "sim-config.h"

#include "sched.h"

#include "atahost.h"

#include "atahost_define.h"

#include "messages.h"

static ata_host atas[MAX_ATAS];

/* reset and initialize ATA host core(s) */

void ata_reset(void)

{

   static int first_time=0;

   unsigned i;

   ata_host *ata;

   // for all ATA cores

   for (i=0; i < config.natas; i++)

   {

     ata = &(atas[i]);

     // reset the core registers

     ata->regs.ctrl  = 0x0001;

     ata->regs.stat  = (DEV_ID << 24) | (REV << 20);

     ata->regs.pctr  = (PIO_MODE0_TEOC << ATA_TEOC) | (PIO_MODE0_T4 << ATA_T4) | (PIO_MODE0_T2 << ATA_T2) | (PIO_MODE0_T1 << ATA_T1);

     ata->regs.pftr0 = (PIO_MODE0_TEOC << ATA_TEOC) | (PIO_MODE0_T4 << ATA_T4) | (PIO_MODE0_T2 << ATA_T2) | (PIO_MODE0_T1 << ATA_T1);

     ata->regs.pftr1 = (PIO_MODE0_TEOC << ATA_TEOC) | (PIO_MODE0_T4 << ATA_T4) | (PIO_MODE0_T2 << ATA_T2) | (PIO_MODE0_T1 << ATA_T1);

     ata->regs.dtr0  = (DMA_MODE0_TEOC << ATA_TEOC) | (DMA_MODE0_TD << ATA_TD) | (DMA_MODE0_TM << ATA_TM);

     ata->regs.dtr1  = (DMA_MODE0_TEOC << ATA_TEOC) | (DMA_MODE0_TD << ATA_TD) | (DMA_MODE0_TM << ATA_TM);

     ata->regs.txb   = 0;

     // copy the config settings

     ata->ata_number = i;

     ata->irq        = config.atas[i].irq;

     ata->baseaddr   = config.atas[i].baseaddr;

     ata->devices.device0.size   = config.atas[i].dev_size0;

     ata->devices.device0.type   = config.atas[i].dev_type0;

     ata->devices.device0.packet = config.atas[i].dev_packet0;

     ata->devices.device1.size   = config.atas[i].dev_size1;

     ata->devices.device1.type   = config.atas[i].dev_type1;

     ata->devices.device1.packet = config.atas[i].dev_packet1;

     /* initialize simulator & ata_devices                                */

     if (!first_time)

     {

       /* Connect ata_devices.                                            */

       ata_devices_init(&ata->devices, config.atas[i].dev_file0, config.atas[i].dev_file1);

       register_memoryarea(ata->baseaddr, ATA_ADDR_SPACE, 4, ata_read32, ata_write32);

     }

     /* the reset bit in the control register 'ctrl' is set, reset connect ata-devices */

     ata_devices_hw_reset(&ata->devices, 1);

   }

   first_time++;

}

/* ========================================================================= */

/* Convert a memory address to a device struct and relative address.

 * Return nonzero on success */

int ata_find_device( unsigned long addr, ata_host **ata, unsigned long *reladdr )

{

  unsigned i;

  *ata = NULL;

  for ( i = 0; i < config.natas && *ata == NULL; ++ i ) {

    if ( (addr >= atas[i].baseaddr) && (addr < atas[i].baseaddr + ATA_ADDR_SPACE) )

      *ata = &(atas[i]);

  }

  /* verify we found a device */

  if ( *ata == NULL )

    return 0;

  /* Verify legal address */

  if ( (addr - (*ata)->baseaddr) % 4 != 0 )

    return 0;

  *reladdr = addr - (*ata) -> baseaddr;

  return 1;

}

/* ========================================================================= */

/*

  Read a register

*/

unsigned long ata_read32( unsigned long addr )

{

    ata_host *ata;

    if ( !ata_find_device( addr, &ata, &addr ) )    {

        fprintf(stderr, "ata_read32( 0x%08lX ): Not in registered range(s)\n", addr );

        return 0;

    }

    /* determine if ata_host or ata_device addressed */

    if (is_ata_hostadr(addr))

        switch( addr ) {

            case ATA_CTRL :

                return ata -> regs.ctrl;

            case ATA_STAT :

                return ata -> regs.stat;

            case ATA_PCTR :

                return ata -> regs.pctr;

#if (DEV_ID > 1)

            case ATA_PFTR0:

                return ata -> regs.pftr0;

            case ATA_PFTR1:

                return ata -> regs.pftr1;

#endif

#if (DEV_ID > 2)

            case ATA_DTR0 :

                return ata -> regs.dtr0;

            case ATA_DTR1 :

                return ata -> regs.dtr1;

            case ATA_RXB  :

                return ata -> regs.rxb;

#endif

            default:

                return 0;

    }

    else

      return ata_devices_read(&ata->devices, addr & 0x7f);

}

/* ========================================================================= */

/*

  Write a register

*/

void ata_write32( unsigned long addr, unsigned long value )

{

    ata_host *ata;

    if ( !ata_find_device( addr, &ata, &addr ) )

    {

        fprintf(stderr, "ata_write32( 0x%08lX ): Not in registered range(s)\n", addr );

        return;

    }

    /* determine if ata_host or ata_device addressed */

    if (is_ata_hostadr(addr))

        switch( addr ) {

            case ATA_CTRL :

                ata -> regs.ctrl =  value;

                /* check if reset bit set, if so reset ata-devices    */

                if (value & ATA_RST)

                  ata_devices_hw_reset(&ata->devices, 1);

                else

                  ata_devices_hw_reset(&ata->devices, 0);

                break;

            case ATA_STAT :

                ata -> regs.stat = (ata -> regs.stat & ~ATA_IDEIS) | (ata -> regs.stat & ATA_IDEIS & value);

                break;

            case ATA_PCTR :

                ata -> regs.pctr = value;

                break;

            case ATA_PFTR0:

                ata -> regs.pftr0 = value;

                break;

            case ATA_PFTR1:

                ata -> regs.pftr1 = value;

                break;

            case ATA_DTR0 :

                ata -> regs.dtr0  = value;

                break;

            case ATA_DTR1 :

                ata -> regs.dtr1  = value;

                break;

            case ATA_TXB  :

                ata -> regs.txb   = value;

                break;

            default:

                /* ERROR-macro currently only supports simple strings. */

                /*

                  fprintf(stderr, "ERROR  : Unknown register for OCIDEC(%1d).\n", DEV_ID );

                  Tried to show some useful info here.

                  But when using 'DM'-simulator-command, the screen gets filled with these messages.

                  Thereby eradicating the usefulness of the message

                */

                break;

        }

    else

        ata_devices_write(&ata->devices, addr & 0x7f, value);

}

/* ========================================================================= */

/* Dump status */

void ata_status( void )

{

  unsigned i;

  ata_host *ata;

  for ( i = 0; i < config.natas; i++ ) {

      ata = &(atas[i]);

      if ( ata->baseaddr == 0 )

         continue;

       printf( "\nOCIDEC-%1d %u at: 0x%08X\n", DEV_ID, i, ata->baseaddr );

       printf( "ATA CTRL     : 0x%08lX\n", ata->regs.ctrl  );

       printf( "ATA STAT     : 0x%08lx\n", ata->regs.stat  );

       printf( "ATA PCTR     : 0x%08lx\n", ata->regs.pctr  );

#if (DEV_ID > 1)

       printf( "ATA FCTR0    : 0x%08lx\n", ata->regs.pftr0 );

       printf( "ATA FCTR1    : 0x%08lx\n", ata->regs.pftr1 );

#endif

#if (DEV_ID > 2)

       printf( "ATA DTR0     : 0x%08lx\n", ata->regs.dtr0  );

       printf( "ATA DTR1     : 0x%08lx\n", ata->regs.dtr1  );

       printf( "ATA TXD      : 0x%08lx\n", ata->regs.txb   );

       printf( "ATA RXD      : 0x%08lx\n", ata->regs.rxb   );

#endif

  }

}

/* ========================================================================= */