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

//

//      mcfxxxx.c

//

//      ColdFire MCFxxxx miscellaneous support

//

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

// ####ECOSGPLCOPYRIGHTBEGIN####

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

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

// Copyright (C) 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.

//

// eCos 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 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):   bartv

// Date:        2008-01-14

//

//####DESCRIPTIONEND####

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

#include <pkgconf/system.h>

#include <pkgconf/hal.h>

#include <pkgconf/hal_m68k_mcfxxxx.h>

#include <cyg/infra/cyg_type.h>

#include <cyg/hal/hal_arch.h>

#include <cyg/hal/hal_intr.h>

#include <cyg/hal/hal_io.h>

#include <cyg/hal/hal_if.h>

#include <cyg/hal/hal_misc.h>

#include <cyg/hal/hal_diag.h>

#include <cyg/hal/drv_api.h>

#ifdef CYGINT_HAL_M68K_MCFxxxx_SOFTWARE_PROFILE_TIMER

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

// Profiling support. This requires a hardware timer set to interrupt

// at a rate determined by application code. The interrupt handler

// should call __profile_hit() with a single argument, the interrupted

// PC. One of the PIT timers, determined by the processor or platform

// HAL is used to implement the profiling timer.

//

// Usually this would involve installing an ISR. However there is no

// easy way for an ISR to get hold of the interrupted PC. In some

// configurations the save state will be stored in hal_saved_interrupt_state,

// but not always. It might be possible to extract the PC from the stack,

// but that gets messy if a separate interrupt stack is used and would be

// vulnerable to changes in the architectural VSR. Instead a custom VSR

// is installed.

extern void hal_mcfxxxx_profile_vsr(void);

# include <cyg/profile/profile.h>

int

hal_enable_profile_timer(int resolution)

{

    cyg_uint16  ticks;

    // Make sure the clock is not running but is otherwise initialized.

    HAL_WRITE_UINT16(HAL_MCFxxxx_PROFILE_TIMER_BASE + HAL_MCFxxxx_PITx_PCSR,

                     HAL_MCFxxxx_PITx_PCSR_PRE_64 | HAL_MCFxxxx_PITx_PCSR_OVW |

                     HAL_MCFxxxx_PITx_PCSR_PIE    | HAL_MCFxxxx_PITx_PCSR_PIF |

                     HAL_MCFxxxx_PITx_PCSR_RLD);

    // The resolution is a time interval in microseconds. The actual

    // cpu clock frequency is determined by the platform. This is divided

    // by 64, which means it may not be possible to get the exact resolution.

    ticks   = ((resolution * CYGHWR_HAL_SYSTEM_CLOCK_MHZ) / 64) - 1;

    HAL_WRITE_UINT16(HAL_MCFxxxx_PROFILE_TIMER_BASE + HAL_MCFxxxx_PITx_PMR, ticks);

    // Convert back to microseconds. This may actually increase rounding

    // errors for some arguments and platforms, but the result should

    // still be accurate enough for practical purposes.

    resolution  = ((ticks + 1) * 64) / CYGHWR_HAL_SYSTEM_CLOCK_MHZ;

    // Set up the interrupt handler. This is usually a high-priority

    // interrupt so that we can get profiling information for other

    // interrupt sources.

#ifdef HAL_VSR_SET    

    HAL_VSR_SET(HAL_MCFxxxx_PROFILE_TIMER_VECTOR, &hal_mcfxxxx_profile_vsr, (cyg_uint32)0);

#endif    

    HAL_INTERRUPT_SET_LEVEL(HAL_MCFxxxx_PROFILE_TIMER_ISR, CYGNUM_HAL_M68K_MCFxxxx_SOFTWARE_PROFILE_TIMER_ISR_PRIORITY);

    HAL_INTERRUPT_UNMASK(HAL_MCFxxxx_PROFILE_TIMER_ISR);

    // Now start the timer running.

    HAL_WRITE_UINT16(HAL_MCFxxxx_PROFILE_TIMER_BASE + HAL_MCFxxxx_PITx_PCSR,

                     HAL_MCFxxxx_PITx_PCSR_PRE_64 | HAL_MCFxxxx_PITx_PCSR_OVW |

                     HAL_MCFxxxx_PITx_PCSR_PIE    | HAL_MCFxxxx_PITx_PCSR_PIF |

                     HAL_MCFxxxx_PITx_PCSR_RLD    | HAL_MCFxxxx_PITx_PCSR_EN);

    // Return the actual resolution.

    return resolution;

}

#endif  // Profiling timer

/* End of mcfxxxx.c */