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

//

//      plf_stub.c

//

//      Platform specific code for GDB stub support.

//

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

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

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

//

// Author(s):   nickg, jskov (based on the old mn10300 hal_stub.c)

// Contributors:nickg, jskov

// Date:        1999-02-12

// Purpose:     Platform specific code for GDB stub support.

//              

//####DESCRIPTIONEND####

//

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

#include <pkgconf/hal.h>

#ifdef CYGDBG_HAL_DEBUG_GDB_INCLUDE_STUBS

#include <cyg/hal/hal_stub.h>

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

#include <cyg/hal/hal_intr.h>           // HAL interrupt macros

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

// MN10300 Serial line

// We use serial1 on MN103002

#define SERIAL1_CR       ((volatile cyg_uint16 *)0x34000810)

#define SERIAL1_ICR      ((volatile cyg_uint8 *) 0x34000814)

#define SERIAL1_TXR      ((volatile cyg_uint8 *) 0x34000818)

#define SERIAL1_RXR      ((volatile cyg_uint8 *) 0x34000819)

#define SERIAL1_SR       ((volatile cyg_uint16 *)0x3400081c)

// Timer 1 provided baud rate divisor

#define TIMER1_MD       ((volatile cyg_uint8 *)0x34001001)

#define TIMER1_BR       ((volatile cyg_uint8 *)0x34001011)

#define TIMER1_CR       ((volatile cyg_uint8 *)0x34001021)

#define PORT3_MD        ((volatile cyg_uint8 *)0x36008025)

// Mystery register

#define TMPSCNT         ((volatile cyg_uint8 *)0x34001071)

#define SIO1_LSTAT_TRDY  0x20

#define SIO1_LSTAT_RRDY  0x10

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

#ifdef CYGDBG_HAL_DEBUG_GDB_BREAK_SUPPORT

// This ISR is called from the interrupt handler. This should only

// happen when there is no serial driver, so the code shouldn't mess

// anything up.

int cyg_hal_gdb_isr(cyg_uint32 vector, target_register_t pc)

{

    if ( CYGNUM_HAL_INTERRUPT_SERIAL_1_RX == vector ) {

        cyg_uint8 c;

        HAL_READ_UINT8 (SERIAL1_RXR, c);

        HAL_INTERRUPT_ACKNOWLEDGE (CYGNUM_HAL_INTERRUPT_SERIAL_1_RX);

        if( 3 == c )

        {

            // Ctrl-C: set a breakpoint at PC so GDB will display the

            // correct program context when stopping rather than the

            // interrupt handler.

            cyg_hal_gdb_interrupt (pc);

            // Interrupt handled. Don't call ISR proper. At return

            // from the VSR, execution will stop at the breakpoint

            // just set.

            return 0;

        }

    }

    // Not caused by GDB. Call ISR proper.

    return 1;

}

int hal_stdeval1_interruptible(int state)

{

    if (state) {

        HAL_WRITE_UINT8 (SERIAL1_ICR, 0);

        HAL_INTERRUPT_ACKNOWLEDGE (CYGNUM_HAL_INTERRUPT_SERIAL_1_RX)

        HAL_INTERRUPT_UNMASK (CYGNUM_HAL_INTERRUPT_SERIAL_1_RX)

    } else {

        HAL_INTERRUPT_MASK (CYGNUM_HAL_INTERRUPT_SERIAL_1_RX)

    }

    return 0;

}

void hal_stdeval1_init_break_irq( void )

{

    // Enable serial receive interrupts.

    HAL_WRITE_UINT8 (SERIAL1_ICR, 0);

    HAL_INTERRUPT_ACKNOWLEDGE (CYGNUM_HAL_INTERRUPT_SERIAL_1_RX)

    HAL_INTERRUPT_UNMASK (CYGNUM_HAL_INTERRUPT_SERIAL_1_RX)

    HAL_ENABLE_INTERRUPTS();

}

#endif

// Initialize the current serial port.

void hal_stdeval1_init_serial( void )

{

    // 48 translates to 38400 baud.

    HAL_WRITE_UINT8 (TIMER1_BR, 48);

    // Timer1 sourced from IOCLK

    HAL_WRITE_UINT8 (TIMER1_MD, 0x80);

    // Mode on PORT3, used for serial line controls.

    HAL_WRITE_UINT8 (PORT3_MD, 0x01);

    // No interrupts for now.

    HAL_WRITE_UINT8 (SERIAL1_ICR, 0x00);

    // Source from timer 1, 8bit chars, enable tx and rx

    HAL_WRITE_UINT16 (SERIAL1_CR, 0xc084);

}

// Write C to the current serial port.

void hal_stdeval1_put_char( int c )

{

    cyg_uint16 sr;

    do {

        HAL_READ_UINT16 (SERIAL1_SR, sr);

    } while ((sr & SIO1_LSTAT_TRDY) != 0);

    HAL_WRITE_UINT8 (SERIAL1_TXR, c);

}

// Read one character from the current serial port.

int hal_stdeval1_get_char( void )

{

    char c;

    cyg_uint16 sr;

    do {

        HAL_READ_UINT16 (SERIAL1_SR, sr);

    } while ((sr & SIO1_LSTAT_RRDY) == 0);

    HAL_READ_UINT8 (SERIAL1_RXR, c);

    return c;

}

#endif // ifdef CYGDBG_HAL_DEBUG_GDB_INCLUDE_STUBS

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

// End of plf_stub.c