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

//

//      plf_stub.c

//

//      Platform specific code for GDB stub support.

//

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

// ####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     

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// for more details.                                                        

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//

// 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   

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// General Public License v2.                                               

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

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

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// ####ECOSGPLCOPYRIGHTEND####                                              

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

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

//

// Author(s):   nickg, jskov (based on the old tx39 hal_stub.c)

// Contributors:nickg, jskov

// Date:        1999-02-12

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

//              

//####DESCRIPTIONEND####

//

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

#include <pkgconf/hal.h>

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

#include <cyg/hal/hal_diag.h>           // diag output. FIXME

#include <cyg/hal/hal_arch.h>

#include <cyg/hal/hal_intr.h>

#include <cyg/hal/hal_if.h>

#include <cyg/hal/hal_misc.h>

#include <cyg/hal/drv_api.h>            // CYG_ISR_HANDLED

#include <cyg/hal/plf_z8530.h>

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

static unsigned char _diag_init[] = {

    0x00, /* Register 0 */

    0x00, /* Register 1 - no interrupts */

    0x00, /* Register 2 */

    0xC1, /* Register 3 - Rx enable, 8 data */

    0x44, /* Register 4 - x16 clock, 1 stop, no parity */

    0x68, /* Register 5 - Tx enable, 8 data */

    0x00, /* Register 6 */

    0x00, /* Register 7 */

    0x00, /* Register 8 */

    0x00, /* Register 9 */

    0x00, /* Register 10 */

    0x56, /* Register 11 - Rx, Tx clocks from baud rate generator */

    0x00, /* Register 12 - baud rate LSB */

    0x00, /* Register 13 - baud rate MSB */

    0x03, /* Register 14 - enable baud rate generator */

    0x00  /* Register 15 */

};

#define BRTC(brate) (( ((unsigned) DUART_CLOCK) / (2*(brate)*SCC_CLKMODE_TC)) - 2)

#define DUART_CLOCK          4915200         /* Z8530 duart */

#define SCC_CLKMODE_TC       16              /* Always run x16 clock for async modes */

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

typedef struct {

    cyg_uint32 base;

    cyg_uint32 msec_timeout;

    int isr_vector;

} channel_data_t;

static channel_data_t channels[2] = {

    { DUART_A, 1000, CYGNUM_HAL_INTERRUPT_DUART},

    { DUART_B, 1000, CYGNUM_HAL_INTERRUPT_DUART}

};

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

// Set the baud rate

static void

cyg_hal_plf_serial_set_baud(cyg_uint32 duart, cyg_uint16 baud_rate)

{

    unsigned short brg = BRTC(baud_rate);

    HAL_DUART_WRITE_CR(duart, 12, brg&0xFF);

    HAL_DUART_WRITE_CR(duart, 13, brg>>8);

}

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

// The minimal init, get and put functions. All by polling.

void

cyg_hal_plf_serial_init_channel(void* __ch_data)

{

    cyg_uint32 duart;

    unsigned short brg = BRTC(CYGNUM_HAL_VIRTUAL_VECTOR_CONSOLE_CHANNEL_BAUD);

    int i;

    channel_data_t *chan;

    // Some of the diagnostic print code calls through here with no idea what the ch_data is.

    // Go ahead and assume it is channels[0].

    if (__ch_data == 0)

        __ch_data = (void*)&channels[0];

    chan = (channel_data_t*)__ch_data;

#ifdef CYGPRI_HAL_VIRTUAL_VECTOR_DEBUG_CHANNEL_CONFIGURABLE    

    if( (chan-&channels[0]) == CYGNUM_HAL_VIRTUAL_VECTOR_DEBUG_CHANNEL )

        brg = BRTC(CYGNUM_HAL_VIRTUAL_VECTOR_DEBUG_CHANNEL_BAUD);

#endif    

#ifdef CYGPRI_HAL_VIRTUAL_VECTOR_CONSOLE_CHANNEL_CONFIGURABLE

    if( (chan-&channels[0]) == CYGNUM_HAL_VIRTUAL_VECTOR_CONSOLE_CHANNEL )

        brg = BRTC(CYGNUM_HAL_VIRTUAL_VECTOR_CONSOLE_CHANNEL_BAUD);

#endif

    duart = chan->base;

    _diag_init[12] = brg & 0xFF;

    _diag_init[13] = brg >> 8;

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

        HAL_DUART_WRITE_CR(duart, i, _diag_init[i]);

    }

}

void

cyg_hal_plf_serial_putc(void* __ch_data, cyg_uint8 __ch)

{

    cyg_uint32 duart;

    cyg_uint8 rr0;

    // Some of the diagnostic print code calls through here with no idea what the ch_data is.

    // Go ahead and assume it is channels[0].

    if (__ch_data == 0)

      __ch_data = (void*)&channels[0];

    duart = ((channel_data_t*)__ch_data)->base;

    CYGARC_HAL_SAVE_GP();

    do

    {

        HAL_DUART_READ_CR(duart, 0, rr0 );

    } while( (rr0 & 0x04) == 0 );

    HAL_DUART_WRITE_TR( duart, __ch );

    HAL_INTERRUPT_ACKNOWLEDGE( CYGNUM_HAL_INTERRUPT_DUART );

    CYGARC_HAL_RESTORE_GP();

}

static cyg_bool

cyg_hal_plf_serial_getc_nonblock(void* __ch_data, cyg_uint8* ch)

{

    cyg_uint32 duart;

    cyg_uint8 rr0;

    // Some of the diagnostic print code calls through here with no idea what the ch_data is.

    // Go ahead and assume it is channels[0].

    if (__ch_data == 0)

      __ch_data = (void*)&channels[0];

    duart = ((channel_data_t*)__ch_data)->base;

    HAL_DUART_READ_CR(duart, 0, rr0 );

    if( (rr0 & 0x01) == 0 )

        return false;

    HAL_DUART_READ_RR( duart, *ch );

    HAL_INTERRUPT_ACKNOWLEDGE( CYGNUM_HAL_INTERRUPT_DUART );

    return true;

}

cyg_uint8

cyg_hal_plf_serial_getc(void* __ch_data)

{

    cyg_uint8 ch;

    CYGARC_HAL_SAVE_GP();

    // Some of the diagnostic print code calls through here with no idea what the ch_data is.

    // Go ahead and assume it is channels[0].

    if (__ch_data == 0)

      __ch_data = (void*)&channels[0];

    while(!cyg_hal_plf_serial_getc_nonblock(__ch_data, &ch));

    CYGARC_HAL_RESTORE_GP();

    return ch;

}

#ifdef CYGSEM_HAL_VIRTUAL_VECTOR_SUPPORT

static void

cyg_hal_plf_serial_write(void* __ch_data, const cyg_uint8* __buf,

                         cyg_uint32 __len)

{

    CYGARC_HAL_SAVE_GP();

    // Some of the diagnostic print code calls through here with no idea what the ch_data is.

    // Go ahead and assume it is channels[0].

    if (__ch_data == 0)

      __ch_data = (void*)&channels[0];

    while(__len-- > 0)

        cyg_hal_plf_serial_putc(__ch_data, *__buf++);

    CYGARC_HAL_RESTORE_GP();

}

static void

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

{

    CYGARC_HAL_SAVE_GP();

    // Some of the diagnostic print code calls through here with no idea what the ch_data is.

    // Go ahead and assume it is channels[0].

    if (__ch_data == 0)

      __ch_data = (void*)&channels[0];

    while(__len-- > 0)

        *__buf++ = cyg_hal_plf_serial_getc(__ch_data);

    CYGARC_HAL_RESTORE_GP();

}

cyg_bool

cyg_hal_plf_serial_getc_timeout(void* __ch_data, cyg_uint8* ch)

{

    int delay_count;

    channel_data_t* chan;

    cyg_bool res;

    CYGARC_HAL_SAVE_GP();

    // Some of the diagnostic print code calls through here with no idea what the ch_data is.

    // Go ahead and assume it is channels[0].

    if (__ch_data == 0)

      __ch_data = (void*)&channels[0];

    chan = (channel_data_t*)__ch_data;

    delay_count = chan->msec_timeout * 10; // delay in .1 ms steps

    for(;;) {

        res = cyg_hal_plf_serial_getc_nonblock(__ch_data, ch);

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

            break;

        CYGACC_CALL_IF_DELAY_US(100);

    }

    CYGARC_HAL_RESTORE_GP();

    return res;

}

static int

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

{

    static int irq_state = 0;

    channel_data_t* chan;

    int ret = 0;

    CYGARC_HAL_SAVE_GP();

    // Some of the diagnostic print code calls through here with no idea what the ch_data is.

    // Go ahead and assume it is channels[0].

    if (__ch_data == 0)

      __ch_data = (void*)&channels[0];

    chan = (channel_data_t*)__ch_data;

    switch (__func) {

    case __COMMCTL_IRQ_ENABLE:

        irq_state = 1;

        HAL_DUART_WRITE_CR( chan->base, 1, 0x10 );

        HAL_DUART_WRITE_CR( chan->base, 9, 0x0a );

        HAL_INTERRUPT_SET_LEVEL(chan->isr_vector, 0);

        HAL_INTERRUPT_UNMASK(chan->isr_vector);

        break;

    case __COMMCTL_IRQ_DISABLE:

        ret = irq_state;

        irq_state = 0;

        HAL_DUART_WRITE_CR( chan->base, 1, 0x00 );

        HAL_DUART_WRITE_CR( chan->base, 9, 0x00 );

        HAL_INTERRUPT_MASK(chan->isr_vector);

        break;

    case __COMMCTL_DBG_ISR_VECTOR:

        ret = chan->isr_vector;

        break;

    case __COMMCTL_SET_TIMEOUT:

    {

        va_list ap;

        va_start(ap, __func);

        ret = chan->msec_timeout;

        chan->msec_timeout = va_arg(ap, cyg_uint32);

        va_end(ap);

    }

    break;

    case __COMMCTL_SETBAUD:

    {

        cyg_uint32 baud_rate;

        cyg_uint32 duart = chan->base;

        va_list ap;

        va_start(ap, __func);

        baud_rate = va_arg(ap, cyg_uint32);

        va_end(ap);

        // Set baud rate.

        cyg_hal_plf_serial_set_baud(duart, baud_rate);

    }

    break;

    case __COMMCTL_GETBAUD:

        break;

    default:

        break;

    }

    CYGARC_HAL_RESTORE_GP();

    return ret;

}

static int

cyg_hal_plf_serial_isr(void *__ch_data, int* __ctrlc,

                       CYG_ADDRWORD __vector, CYG_ADDRWORD __data)

{

    int res = 0;

    channel_data_t* chan;

    char c;

    CYGARC_HAL_SAVE_GP();

    // Some of the diagnostic print code calls through here with no idea what the ch_data is.

    // Go ahead and assume it is channels[0].

    if (__ch_data == 0)

      __ch_data = (void*)&channels[0];

    chan = (channel_data_t*)__ch_data;

    HAL_INTERRUPT_ACKNOWLEDGE(chan->isr_vector);

    *__ctrlc = 0;

    if ( cyg_hal_plf_serial_getc_nonblock(__ch_data, &c) )

    {

        if( cyg_hal_is_break( &c , 1 ) )

            *__ctrlc = 1;

        res = CYG_ISR_HANDLED;

    }

    CYGARC_HAL_RESTORE_GP();

    return res;

}

#endif

static void

cyg_hal_plf_serial_init(void)

{

#ifdef CYGSEM_HAL_VIRTUAL_VECTOR_SUPPORT    

    hal_virtual_comm_table_t* comm;

    int cur = CYGACC_CALL_IF_SET_CONSOLE_COMM(CYGNUM_CALL_IF_SET_COMM_ID_QUERY_CURRENT);

#endif

    // Disable interrupts.

    HAL_INTERRUPT_MASK(channels[0].isr_vector);

    // Init channels

    cyg_hal_plf_serial_init_channel((void*)&channels[0]);

#ifdef CYGSEM_HAL_VIRTUAL_VECTOR_SUPPORT    

    // Setup procs in the vector table

    // Set channel 0

    CYGACC_CALL_IF_SET_CONSOLE_COMM(0);

    comm = CYGACC_CALL_IF_CONSOLE_PROCS();

    CYGACC_COMM_IF_CH_DATA_SET(*comm, &channels[0]);

    CYGACC_COMM_IF_WRITE_SET(*comm, cyg_hal_plf_serial_write);

    CYGACC_COMM_IF_READ_SET(*comm, cyg_hal_plf_serial_read);

    CYGACC_COMM_IF_PUTC_SET(*comm, cyg_hal_plf_serial_putc);

    CYGACC_COMM_IF_GETC_SET(*comm, cyg_hal_plf_serial_getc);

    CYGACC_COMM_IF_CONTROL_SET(*comm, cyg_hal_plf_serial_control);

    CYGACC_COMM_IF_DBG_ISR_SET(*comm, cyg_hal_plf_serial_isr);

    CYGACC_COMM_IF_GETC_TIMEOUT_SET(*comm, cyg_hal_plf_serial_getc_timeout);

    // Restore original console

    CYGACC_CALL_IF_SET_CONSOLE_COMM(cur);

#endif    

}

void

cyg_hal_plf_comms_init(void)

{

    static int initialized = 0;

    if (initialized)

        return;

    initialized = 1;

    cyg_hal_plf_serial_init();

}

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

// End of plf_serial.c