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

//

//      e7t_misc.c

//

//      HAL misc board support code for ARM E7T

//

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

// ####ECOSGPLCOPYRIGHTBEGIN####                                            

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

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

// Copyright (C) 1998, 1999, 2000, 2001, 2002 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):    gthomas

// Contributors: gthomas, jskov

// Date:         2001-03-16

// Purpose:      HAL board support

// Description:  Implementations of HAL board interfaces

//

//####DESCRIPTIONEND####

//

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

#include <pkgconf/hal.h>

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

#include <cyg/infra/cyg_trac.h>         // tracing macros

#include <cyg/infra/cyg_ass.h>          // assertion macros

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

#include <cyg/hal/hal_arch.h>           // Register state info

#include <cyg/hal/hal_diag.h>

#include <cyg/hal/hal_intr.h>           // necessary?

#include <cyg/hal/hal_cache.h>

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

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

#ifdef CYGDBG_HAL_DEBUG_GDB_BREAK_SUPPORT

#include <cyg/hal/drv_api.h>            // HAL ISR support

#endif

#include <cyg/hal/plf_io.h>             // platform registers

static cyg_uint32 _period;

#ifdef CYGDBG_HAL_DEBUG_GDB_BREAK_SUPPORT

static cyg_interrupt abort_interrupt;

static cyg_handle_t  abort_interrupt_handle;

// This ISR is called only for the Abort button interrupt

static int

e7t_abort_isr(cyg_vector_t vector, cyg_addrword_t data, HAL_SavedRegisters *regs)

{

    cyg_hal_user_break((CYG_ADDRWORD*)regs);

    cyg_drv_interrupt_acknowledge(CYGNUM_HAL_INTERRUPT_EXT0);

    return 0;  // No need to run DSR

}

#endif

void hal_clock_initialize(cyg_uint32 period)

{

    cyg_uint32 tmod;

    // Disable timer 0

    HAL_READ_UINT32(E7T_TMOD, tmod);

    tmod &= ~(E7T_TMOD_TE0);

    HAL_WRITE_UINT32(E7T_TMOD, 0);

    tmod &= ~(E7T_TMOD_TMD0 | E7T_TMOD_TCLR0);

    tmod |= E7T_TMOD_TE0;

    // Set counter

    HAL_WRITE_UINT32(E7T_TDATA0, period);

    // And enable timer

    HAL_WRITE_UINT32(E7T_TMOD, tmod);

    _period = period;

#ifdef CYGDBG_HAL_DEBUG_GDB_BREAK_SUPPORT

    cyg_drv_interrupt_create(CYGNUM_HAL_INTERRUPT_EXT0,

                             99,           // Priority

                             0,            // Data item passed to interrupt handler

                             e7t_abort_isr,

                             0,

                             &abort_interrupt_handle,

                             &abort_interrupt);

    cyg_drv_interrupt_attach(abort_interrupt_handle);

    cyg_drv_interrupt_unmask(CYGNUM_HAL_INTERRUPT_EXT0);

#endif

}

void hal_clock_reset(cyg_uint32 vector, cyg_uint32 period)

{

    _period = period;

}

void hal_clock_read(cyg_uint32 *pvalue)

{

    cyg_uint32 value;

    HAL_READ_UINT32(E7T_TCNT0, value);

    *pvalue = _period - value;

}

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

//

// Delay for some number of micro-seconds

//

void hal_delay_us(cyg_int32 usecs)

{

    cyg_uint32 count;

    cyg_uint32 ticks = ((CYGNUM_HAL_RTC_PERIOD*CYGNUM_HAL_RTC_DENOMINATOR)/1000000) * usecs;

    cyg_uint32 tmod;

    // Disable timer 1

    HAL_READ_UINT32(E7T_TMOD, tmod);

    tmod &= ~(E7T_TMOD_TE1);

    HAL_WRITE_UINT32(E7T_TMOD, tmod);

    tmod &= ~(E7T_TMOD_TMD1 | E7T_TMOD_TCLR1);

    tmod |= E7T_TMOD_TE1;

    // Clear pending flag

    HAL_WRITE_UINT32(E7T_INTPND, (1 << CYGNUM_HAL_INTERRUPT_TIMER1));

    // Set counter

    HAL_WRITE_UINT32(E7T_TDATA1, ticks);

    // And enable timer

    HAL_WRITE_UINT32(E7T_TMOD, tmod);

    // Wait for timer to underflow. Can't test the timer completion

    // bit without actually enabling the interrupt. So instead watch

    // the counter.

    ticks /= 2;                         // wait for this threshold

    // Wait till timer counts below threshold

    do {

        HAL_READ_UINT32(E7T_TCNT1, count);

    } while (count >= ticks);

    // then wait for it to be reloaded

    do {

        HAL_READ_UINT32(E7T_TCNT1, count);

    } while (count < ticks);

    // Then disable timer 1 again

    tmod &= ~E7T_TMOD_TE1;

    HAL_WRITE_UINT32(E7T_TMOD, tmod);

}

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

// Hardware init

void hal_hardware_init(void)

{

    cyg_uint32 intmask;

    // Set up eCos/ROM interfaces

    hal_if_init();

    // Enable cache

    HAL_WRITE_UINT32(E7T_SYSCFG,

                     0x07FFFF80|E7T_SYSCFG_CM_0R_8C|E7T_SYSCFG_WE);

    HAL_UCACHE_INVALIDATE_ALL();

    HAL_UCACHE_ENABLE();

    // Clear global interrupt mask bit

    HAL_READ_UINT32(E7T_INTMSK, intmask);

    intmask &= ~E7T_INTMSK_GLOBAL;

    HAL_WRITE_UINT32(E7T_INTMSK, intmask);

}

//

// This routine is called to respond to a hardware interrupt (IRQ).  It

// should interrogate the hardware and return the IRQ vector number.

int hal_IRQ_handler(void)

{

    // Do hardware-level IRQ handling

    cyg_uint32 irq_status;

    HAL_READ_UINT32(E7T_INTOFFSET_IRQ, irq_status);

    irq_status = irq_status / 4;

    if (CYGNUM_HAL_ISR_MAX >= irq_status)

        return irq_status;

    // It's a bit bogus to test for FIQs after IRQs, but we use the

    // latter more, so don't impose the overhead of checking for FIQs

    HAL_READ_UINT32(E7T_INTOFFSET_FIQ, irq_status);

    irq_status = irq_status / 4;

    if (CYGNUM_HAL_ISR_MAX >= irq_status)

        return irq_status;

    return CYGNUM_HAL_INTERRUPT_NONE;

}

//

// Interrupt control

//

void hal_interrupt_mask(int vector)

{

    cyg_uint32 mask, old_mask;

    HAL_READ_UINT32(E7T_INTMSK, mask);

    old_mask = mask;

    mask |= (1<<vector);

    HAL_WRITE_UINT32(E7T_INTMSK, mask);

}

void hal_interrupt_unmask(int vector)

{

    cyg_uint32 mask, old_mask;

    HAL_READ_UINT32(E7T_INTMSK, mask);

    old_mask = mask;

    mask &= ~(1<<vector);

    HAL_WRITE_UINT32(E7T_INTMSK, mask);

}

void hal_interrupt_acknowledge(int vector)

{

    HAL_WRITE_UINT32(E7T_INTPND, (1<<vector));

}

void hal_interrupt_configure(int vector, int level, int up)

{

}

void hal_interrupt_set_level(int vector, int level)

{

}

void hal_show_IRQ(int vector, int data, int handler)

{

}

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

// EOF hal_misc.c