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

//

//      hal_diag_dcc.c

//

//      HAL diagnostic output via the DCC interface.

//

//=============================================================================

// ####ECOSGPLCOPYRIGHTBEGIN####

// -------------------------------------------

// This file is part of eCos, the Embedded Configurable Operating System.

// Copyright (C) 1998, 1999, 2000, 2001, 2002, 2008 Free Software Foundation, Inc.

//

// eCos 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 or (at your option) any later

// version.

//

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// 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 eCos; if not, write to the Free Software Foundation, Inc.,

// 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.

//

// As a special exception, if other files instantiate templates or use

// macros or inline functions from this file, or you compile this file

// and link it with other works to produce a work based on this file,

// this file does not by itself cause the resulting work to be covered by

// the GNU General Public License. However the source code for this file

// must still be made available in accordance with section (3) of the GNU

// General Public License v2.

//

// This exception does not invalidate any other reasons why a work based

// on this file might be covered by the GNU General Public License.

// -------------------------------------------

// ####ECOSGPLCOPYRIGHTEND####

//=============================================================================

//#####DESCRIPTIONBEGIN####

//

// Author(s):   Andrew Lunn

// Contributors:jskov, gthomas

// Date:        2008-06-15

// Purpose:     HAL diagnostic output via DCC.

// Description: Implementations of HAL diagnostic output support.

//

//####DESCRIPTIONEND####

//

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

#include <pkgconf/hal.h>

#include CYGBLD_HAL_PLATFORM_H

#include <cyg/infra/cyg_type.h>         // base types

#include <cyg/hal/hal_arch.h>           // SAVE/RESTORE GP macros

#include <cyg/hal/hal_io.h>             // IO macros

#include <cyg/hal/hal_if.h>             // interface API

#include <cyg/hal/hal_intr.h>           // HAL_ENABLE/MASK/UNMASK_INTERRUPTS

#include <cyg/hal/hal_misc.h>           // Helper functions

#include <cyg/hal/hal_diag.h>

#define DCC_TX_BUSY 2

#define DCC_RX_READY 1

//-----------------------------------------------------------------------------

static void

cyg_hal_plf_dcc_putc(void * __ch_data, char ch)

{

  unsigned int status;

  CYG_UNUSED_PARAM(void *, __ch_data);

  CYGARC_HAL_SAVE_GP();

  do {

    __asm__ volatile ( "mrc p14,0, %0, c0, c0\n" : "=r" (status));

  } while ( status & DCC_TX_BUSY );

  __asm__( "mcr p14,0, %0, c1, c0\n" : : "r" (ch));

  CYGARC_HAL_RESTORE_GP();

}

static cyg_bool

cyg_hal_plf_dcc_getc_nonblock(cyg_uint8* ch)

{

  cyg_uint32 status;

  cyg_uint32 c;

  __asm__( "mrc p14,0, %0, c0, c0\n" : "=r" (status));

  if (status & DCC_RX_READY) {

    __asm__( "mrc p14,0, %0, c1, c0\n" : "=r" (c));

    *ch = (char )c;

    return true;

  } else

    return false;

}

static cyg_uint8

cyg_hal_plf_dcc_getc(void* __ch_data)

{

  cyg_uint8 ch;

  CYG_UNUSED_PARAM(void *, __ch_data);

  CYGARC_HAL_SAVE_GP();

  while(!cyg_hal_plf_dcc_getc_nonblock(&ch));

  CYGARC_HAL_RESTORE_GP();

  return ch;

}

static void

cyg_hal_plf_dcc_write(void* __ch_data, const cyg_uint8* __buf,

                      cyg_uint32 __len)

{

  CYG_UNUSED_PARAM(void *, __ch_data);

  CYGARC_HAL_SAVE_GP();

  while(__len-- > 0)

    cyg_hal_plf_dcc_putc(NULL, *__buf++);

  CYGARC_HAL_RESTORE_GP();

}

static void

cyg_hal_plf_dcc_read(void* __ch_data, cyg_uint8* __buf, cyg_uint32 __len)

{

  CYG_UNUSED_PARAM(void *, __ch_data);

  CYGARC_HAL_SAVE_GP();

  while(__len-- > 0)

    *__buf++ = cyg_hal_plf_dcc_getc(NULL);

  CYGARC_HAL_RESTORE_GP();

}

static cyg_bool

cyg_hal_plf_dcc_getc_timeout(void* __ch_data, cyg_uint8* ch)

{

  int delay_count;

  cyg_bool res;

  CYG_UNUSED_PARAM(void *, __ch_data);

  CYGARC_HAL_SAVE_GP();

  delay_count = 100010; // delay in .1 ms steps

  for(;;) {

    res = cyg_hal_plf_dcc_getc_nonblock(ch);

    if (res || 0 == delay_count--)

      break;

    CYGACC_CALL_IF_DELAY_US(100);

  }

  CYGARC_HAL_RESTORE_GP();

  return res;

}

static int

cyg_hal_plf_dcc_control(void *__ch_data, __comm_control_cmd_t __func, ...)

{

  CYG_UNUSED_PARAM(void *, __ch_data);

  CYG_UNUSED_PARAM(__comm_control_cmd_t, __func);

  return 0;

}

static void

cyg_hal_plf_dcc_register(const int channel)

{

  hal_virtual_comm_table_t* comm;

  int cur;

  cur = CYGACC_CALL_IF_SET_CONSOLE_COMM(CYGNUM_CALL_IF_SET_COMM_ID_QUERY_CURRENT);

  // Setup procs in the vector table

  CYGACC_CALL_IF_SET_CONSOLE_COMM(channel);

  comm = CYGACC_CALL_IF_CONSOLE_PROCS();

  CYGACC_COMM_IF_CH_DATA_SET(*comm, NULL);

  CYGACC_COMM_IF_WRITE_SET(*comm, cyg_hal_plf_dcc_write);

  CYGACC_COMM_IF_READ_SET(*comm, cyg_hal_plf_dcc_read);

  CYGACC_COMM_IF_PUTC_SET(*comm, cyg_hal_plf_dcc_putc);

  CYGACC_COMM_IF_GETC_SET(*comm, cyg_hal_plf_dcc_getc);

  CYGACC_COMM_IF_CONTROL_SET(*comm, cyg_hal_plf_dcc_control);

  CYGACC_COMM_IF_DBG_ISR_SET(*comm, NULL);

  CYGACC_COMM_IF_GETC_TIMEOUT_SET(*comm, cyg_hal_plf_dcc_getc_timeout);

  // Restore to original console.

  CYGACC_CALL_IF_SET_CONSOLE_COMM(cur);

}

void

cyg_hal_plf_dcc_init(const int channel)

{

  static int initialized = 0;

  if (initialized)

    return;

  initialized = 1;

  cyg_hal_plf_dcc_register(channel);

}

//-----------------------------------------------------------------------------

// End of hal_diag_dcc.c