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/* GECKO3COM

 *

 * Copyright (C) 2008 by

 *   ___    ____  _   _

 *  (  _`\ (  __)( ) ( )

 *  | (_) )| (_  | |_| |   Bern University of Applied Sciences

 *  |  _ <'|  _) |  _  |   School of Engineering and

 *  | (_) )| |   | | | |   Information Technology

 *  (____/'(_)   (_) (_)

 *

 *

 * 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 3 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, see <http://www.gnu.org/licenses/>.

 */

/*********************************************************************/

/** \file     gecko3com_gpif.c

 *********************************************************************

 * \brief     project specific functions to handle the GPIF

 *

 *

 *

 * \author    GNUradio team, Christoph Zimmermann bfh.ch

 * \date      2009-4-16

 *

 * \note Comments from the original GNU radio source: \n

 * The GPIF Designer tool is kind of screwed up, in that it doesn't

 * configure some of the ports correctly.  We just use their tables and

 * handle the initialization ourselves.  They also declare that their

 * static initialized data is in xdata, which screws us too.

 *

*/

#include <stdint.h>

#include "gecko3com_gpif.h"

#include "gpif_data.h"

#include "isr.h"

#include "delay.h"

#include "fx2regs.h"

#include "gecko3com_regs.h"

#include "gecko3com_interfaces.h"

#include "syncdelay.h"

#include "debugprint.h"

/* These are the tables generated by the Cypress GPIF Designer */

/** \brief Waveform data generated by the Cypress GPIF Designer

 *

 *  this table is defined in the gpif_data.c file. provide the

 *  desired file for your board

 */

extern const char WaveData[128];

/** \brief Flowstate data generated by the Cypress GPIF Designer

 *

 *  this table is defined in the gpif_data.c file. provide the

 *  desired file for your board

 */

extern const char FlowStates[36];

/** \brief Init values generated by the Cypress GPIF Designer

 *  and the edit-gpif script

 *

 *  this table is defined in the gpif_data.h file. provide the

 *  desired file for your board

 */

extern const char InitData[7];

//** private flag to signal, that the GPIF receives data from the FPGA */

//volatile static uint8_t flGPIF;

/**

 * \brief exectuted when the gpif waveform terminates

 */

void

isr_gpif_done (void) interrupt

{

  ISR_DEBUG_PORT |= bmGPIF_DONE;

  /* check if this is a end of a IN transfer */

  if((flGPIF & bmGPIF_READ_IN_PROGRESS) == bmGPIF_READ_IN_PROGRESS){

    INPKTEND = USB_TMC_EP_IN;

  }

  while(!(GPIFTRIG & bmGPIF_IDLE));

  /* check if there is data available for an OUT transfer */

  if((flGPIF & bmGPIF_PENDING_DATA) == bmGPIF_PENDING_DATA) {

    //if(!(EP2468STAT & bmEP2EMPTY)) {

    flGPIF &= ~bmGPIF_PENDING_DATA;

    gpif_trigger_write();

    flGPIF &= ~bmGPIF_READ_IN_PROGRESS;

  }

  else {

    gpif_trigger_read();

    flGPIF |= bmGPIF_READ_IN_PROGRESS;

  }

  clear_fifo_gpif_irq();

  ISR_DEBUG_PORT &= ~bmGPIF_DONE;

}

/**

 * \brief exectuted when data is available in the OUT endpoint

 */

void

isr_endpoint_out_data (void) interrupt

{

  ISR_DEBUG_PORT |= bmFIFO_PF;

  /* check if there is a active IN transfer */

  if((GPIFREADYSTAT & bmWRX) == bmWRX) {

    flGPIF |= bmGPIF_PENDING_DATA;

  }

  else {

    GPIFABORT = 0xFF;

    SYNCDELAY;

    while(!(GPIFTRIG & bmGPIF_IDLE));

    gpif_trigger_write();

    flGPIF &= ~bmGPIF_READ_IN_PROGRESS;

  }

  clear_fifo_gpif_irq();

  ISR_DEBUG_PORT &= ~bmFIFO_PF;

}

/** \brief initialize GPIF system */

void init_gpif (void)

{

  uint8_t i;

#ifdef GECKO3MAIN

  /* IFCLK is generated internally and runs at 30 MHz; GPIF "master mode" */

  //IFCONFIG = bmIFCLKSRC | bm3048MHZ | bmIFCLKOE | bmGSTATE | bmIFGPIF;

  IFCONFIG = bmIFCLKSRC | bmIFCLKOE | bmGSTATE | bmIFGPIF;

  SYNCDELAY;

  /* we have to commit the currently processed packet BEFORE we switch to auto out mode */

  OUTPKTEND = bmSKIP | USB_TMC_EP_OUT;

  /*FIXME  only here for testing */

  //EP6AUTOINLENH = (20) >> 8;     SYNCDELAY;  /* this is the length for high speed */

  //EP6AUTOINLENL = (20) & 0xff;  SYNCDELAY;

  /* enable autoout and autoin feature of the endpoints */

  EP2FIFOCFG |= bmAUTOOUT;

  SYNCDELAY;

  EP6FIFOCFG |= bmAUTOIN;

  SYNCDELAY;

  /* set endpoint 2 fifo (out) programmable flag to "higher or equal 3"

   * we use the programmable flag as interrupt source to detect if data for the

   * FPGA is available and as GPIF flag to stop the flowstate, for this the

   * flag has to change one cycle before the FIFO is completly empty, else we

   * transfer one word too much */

  EP2FIFOPFH = bmDECIS;

  EP2FIFOPFL = 4;

  SYNCDELAY;

  EP2GPIFFLGSEL = bmFLAG_PROGRAMMABLE;

  //EP2GPIFFLGSEL = bmFLAG_EMPTY;

  SYNCDELAY;

  EP6GPIFFLGSEL = bmFLAG_FULL;

  SYNCDELAY;

  EP2GPIFPFSTOP = 0;

  EP6GPIFPFSTOP = 0;

#endif

  GPIFABORT = 0xFF;  /* abort any waveforms pending */

  SYNCDELAY;

  GPIFREADYCFG = InitData[ 0 ];

  GPIFCTLCFG = InitData[ 1 ];

  GPIFIDLECS = InitData[ 2 ];

  GPIFIDLECTL = InitData[ 3 ];

  /* Hmmm, what's InitData[ 4 ] ... */

  GPIFWFSELECT = InitData[ 5 ];

  /* GPIFREADYSTAT = InitData[ 6 ]; */  /* I think this register is read only... */

  for (i = 0; i < 128; i++){

    GPIF_WAVE_DATA[i] = WaveData[i];

  }

  setup_flowstate_common();

  FLOWSTATE = 0;         /* ensure it's off */

  GPIFREADYCFG |= bmINTRDY; /* set the internal ready signal */

  /* unset gpif flags */

  flGPIF = 0;

  EA = 0;                /* disable all interrupts */

  /* hook gpif interupt services */

  /* due to big problems with the done interrupt, we use the WAVEFORM interrupt

     to signal the firmware that the GPIF is done */

  hook_fgv(FGV_GPIFWF,(unsigned short) isr_gpif_done);

  hook_fgv(FGV_EP2PF,(unsigned short) isr_endpoint_out_data);

  EP2FIFOIE = bmFIFO_PF;

  GPIFIE = bmGPIFWF;

  EA = 1;               /* global interrupt enable */

  /* start gpif read, default state of the gpif to wait for fpga data */

  gpif_trigger_read();

}

/** \brief aborts any gpif running gpif transaction  */

void abort_gpif(void) {

  EA = 0;                /* disable all interrupts */

  flGPIF = 0;

  /* abort the current GPIF waveform */

  GPIFABORT = 0xFF;

  SYNCDELAY;

  while(!(GPIFTRIG & bmGPIF_IDLE));

  EA = 1;               /* global interrupt enable */

  //print_info("gpif aborted\n");

#ifdef GECKO3MAIN

  /* signal an abort condition to the FPGA (both WRU and RDYU high) */

  GPIFIDLECTL |= bmRDYU | bmWRU;

  udelay(10);

  GPIFIDLECTL = InitData[ 3 ]; /* restore original state */

#endif

  gpif_trigger_read();

  flGPIF |= bmGPIF_READ_IN_PROGRESS;

}

/** \brief disables gpif system */

void deactivate_gpif(void) {

  EA = 0;          /* disable all interrupts */

  EP2FIFOIE = 0;  /* disable FIFO interrupt */

  SYNCDELAY;

  GPIFIE = 0;     /* disable all GPIF interrupts */

  SYNCDELAY;

  GPIFTCB0 = 0x00;

  EP2GPIFPFSTOP = 1;

  EP6GPIFPFSTOP = 1;

  GPIFABORT = 0xFF; /* abort pending GPIF transaction */

  SYNCDELAY;

  flGPIF = 0;  /* unset all internal GPIF flags */

  EA = 1;               /* global interrupt enable */

  while(!(GPIFTRIG & bmGPIF_IDLE));

#ifdef GECKO3MAIN

  /* signal an abort condition to the FPGA (both WRU and RDYU high) */

  GPIFIDLECTL |= bmRDYU | bmWRU;

  udelay(10);

  GPIFIDLECTL = InitData[ 3 ]; /* restore original state */

  EP2FIFOCFG &= ~bmAUTOOUT;  /* disable AutoOUT feature */

  SYNCDELAY;

  //EP6FIFOCFG &= ~bmINFM;

  EP6FIFOCFG &= ~bmAUTOIN;   /* disable AutoIN feature */

#endif

  //print_info("gpif deactivated\n");

}