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

//

//      pid_misc.c

//

//      HAL misc board support code for ARM PID7

//

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

// ####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

// Date:         1999-02-20

// 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_if.h>             // calling interface

/*------------------------------------------------------------------------*/

// On-board timer

/*------------------------------------------------------------------------*/

// Timer registers

#define CYG_DEVICE_TIMER1_BASE   0x0A800020

#define CYG_DEVICE_TIMER1_LOAD \

    ((volatile cyg_uint32 *) (CYG_DEVICE_TIMER1_BASE + 0x00))

    // Load value, read/write

#define CYG_DEVICE_TIMER1_CURRENT \

    ((volatile cyg_uint32 *) (CYG_DEVICE_TIMER1_BASE + 0x04))

    // Current value, read

#define CYG_DEVICE_TIMER1_CONTROL \

    ((volatile cyg_uint32 *) (CYG_DEVICE_TIMER1_BASE + 0x08))

    // Control register, read/write

#define CYG_DEVICE_TIMER1_CLEAR \

    ((volatile cyg_uint32 *) (CYG_DEVICE_TIMER1_BASE + 0x0C))

    // Clears interrrupt, write only

#define CYG_DEVICE_TIMER_BASE   0x0A800020

#define CYG_DEVICE_TIMER_LOAD \

    ((volatile cyg_uint32 *) (CYG_DEVICE_TIMER_BASE + 0x00))

    // Load value, read/write

#define CYG_DEVICE_TIMER_CURRENT \

    ((volatile cyg_uint32 *) (CYG_DEVICE_TIMER_BASE + 0x04))

    // Current value, read

#define CYG_DEVICE_TIMER_CONTROL \

    ((volatile cyg_uint32 *) (CYG_DEVICE_TIMER_BASE + 0x08))

    // Control register, read/write

#define CYG_DEVICE_TIMER_CLEAR \

    ((volatile cyg_uint32 *) (CYG_DEVICE_TIMER_BASE + 0x0C))

    // Clears interrrupt, write only

// Clock/timer control register

#define CTL_ENABLE      0x80            // Bit   7: 1 - counter enabled

#define CTL_DISABLE     0x00            //          0 - counter disabled

#define CTL_FREERUN     0x00            // Bit   6: 0 - free running counter

#define CTL_PERIODIC    0x40            //          1 - periodic timer mode

#define CTL_SCALE_1     0x00            // Bits 32: 00 - Scale clock by 1

#define CTL_SCALE_16    0x04            //          01 - Scale by 16

#define CTL_SCALE_256   0x08            //          10 - Scale by 256

                                        //               12.8us/tick

// Interrupt controller registers

#define CYG_DEVICE_ICTL_BASE    0x0A000000

#define CYG_DEVICE_IRQ_Status \

    ((volatile cyg_uint32 *) (CYG_DEVICE_ICTL_BASE + 0x00))

    // Current status, read only

#define CYG_DEVICE_IRQ_Enable \

    ((volatile cyg_uint32 *) (CYG_DEVICE_ICTL_BASE + 0x08))

    // Enable status, read only

#define CYG_DEVICE_IRQ_EnableSet \

    ((volatile cyg_uint32 *) (CYG_DEVICE_ICTL_BASE + 0x08))

    // Enable (1's only), write only

#define CYG_DEVICE_IRQ_EnableClear \

    ((volatile cyg_uint32 *) (CYG_DEVICE_ICTL_BASE + 0x0C))

    // Disable (1's only), write only

static cyg_uint32 _period;

void hal_clock_initialize(cyg_uint32 period)

{

    //diag_init();  diag_printf("%s(%d)\n", __PRETTY_FUNCTION__, period);

    //diag_printf("psr = %x\n", psr());

    HAL_WRITE_UINT32(CYG_DEVICE_TIMER_CONTROL, CTL_DISABLE);    // Turn off

    HAL_WRITE_UINT32(CYG_DEVICE_TIMER_LOAD, period);

    HAL_WRITE_UINT32(CYG_DEVICE_TIMER_CONTROL,

                     CTL_ENABLE | CTL_PERIODIC | CTL_SCALE_16);

    _period = period;

}

void hal_clock_reset(cyg_uint32 vector, cyg_uint32 period)

{

    //diag_init();  diag_printf("%s\n", __PRETTY_FUNCTION__);

    HAL_WRITE_UINT32(CYG_DEVICE_TIMER_CLEAR, 0);

    _period = period;

}

void hal_clock_read(cyg_uint32 *pvalue)

{

    cyg_uint32 value;

//    diag_init();  diag_printf("%s\n", __PRETTY_FUNCTION__);

    HAL_READ_UINT32(CYG_DEVICE_TIMER_CURRENT, value);

    value &= 0xFFFF;

    *pvalue = _period - (value & 0xFFFF);   // Note: counter is only 16 bits

                                            //       and decreases

}

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

//

// Delay for some number of micro-seconds

//

void hal_delay_us(cyg_int32 usecs)

{

    cyg_uint32 value;

    cyg_uint64 ticks = ((usecs*CYGNUM_HAL_RTC_PERIOD*CYGNUM_HAL_RTC_DENOMINATOR)/1000000);

    HAL_WRITE_UINT32(CYG_DEVICE_TIMER1_CONTROL, CTL_DISABLE);    // Turn off

    HAL_WRITE_UINT32(CYG_DEVICE_TIMER1_LOAD, ticks);

    HAL_WRITE_UINT32(CYG_DEVICE_TIMER1_CONTROL,

                     CTL_ENABLE | CTL_FREERUN | CTL_SCALE_16);

    // Wait for timer to underflow

    do {

        HAL_READ_UINT32(CYG_DEVICE_TIMER_CURRENT, value);

        value &= 0xFFFF;

    } while (value < 0x7fff);

    HAL_WRITE_UINT32(CYG_DEVICE_TIMER1_CONTROL, CTL_DISABLE);    // Turn off

}

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

void hal_hardware_init(void)

{

    // Any hardware/platform initialization that needs to be done.

    HAL_WRITE_UINT32(CYG_DEVICE_IRQ_EnableClear, 0xFFFF); // Clear all

                                                         // interrupt sources

    // Set up eCos/ROM interfaces

    hal_if_init();

}

//

// 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

    int irq_status, vector;

    HAL_READ_UINT32(CYG_DEVICE_IRQ_Status, irq_status);

    //diag_init();  diag_printf("%s, status: %x\n", __PRETTY_FUNCTION__, irq_status); 

    for (vector = 1;  vector < 16;  vector++) {

        if (irq_status & (1<<vector)) return vector;

    }

    return CYGNUM_HAL_INTERRUPT_NONE; // This shouldn't happen!

}

//

// Interrupt control

//

void hal_interrupt_mask(int vector)

{

    //diag_init();  diag_printf("%s(%d)\n", __PRETTY_FUNCTION__, vector);

    HAL_WRITE_UINT32(CYG_DEVICE_IRQ_EnableClear, 1<<vector);

}

#if 0

void hal_interrupt_status(void)

{

    int irq_status, irq_enable, timer_status, timer_value, timer_load;

    HAL_READ_UINT32(CYG_DEVICE_IRQ_Status, irq_status);

    HAL_READ_UINT32(CYG_DEVICE_IRQ_Enable, irq_enable);

    HAL_READ_UINT32(CYG_DEVICE_TIMER_LOAD, timer_load);

    HAL_READ_UINT32(CYG_DEVICE_TIMER_CURRENT, timer_value);

    HAL_READ_UINT32(CYG_DEVICE_TIMER_CONTROL, timer_status);

    diag_printf("Interrupt: IRQ: %x.%x, TIMER: %x.%x.%x, psr: %x\n",

                irq_status, irq_enable, timer_status, timer_value,

                timer_load, psr());

}

#endif

void hal_interrupt_unmask(int vector)

{

    //diag_init();  diag_printf("%s(%d)\n", __PRETTY_FUNCTION__, vector);

    HAL_WRITE_UINT32(CYG_DEVICE_IRQ_EnableSet, 1<<vector);

}

void hal_interrupt_acknowledge(int vector)

{

    //diag_init();  diag_printf("%s(%d)\n", __PRETTY_FUNCTION__, vector);

}

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

{

    //diag_init();  diag_printf("%s(%d,%d,%d)\n", __PRETTY_FUNCTION__, vector, level, up);

}

void hal_interrupt_set_level(int vector, int level)

{

    //diag_init();  diag_printf("%s(%d,%d)\n", __PRETTY_FUNCTION__, vector, level);

}

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

{

    //    diag_printf("IRQ - vector: %x, data: %x, handler: %x\n", vector, data, handler);

}

/*---------------------------------------------------------------------------*/

/* End of hal_misc.c */