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

//

//      ser.c

//

//      Simple driver for the MDSChip serial port

//

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

//####ECOSGPLCOPYRIGHTBEGIN####

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

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

// Copyright (C) 1998, 1999, 2000, 2001, 2002 Red Hat, Inc.

//

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//

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// or inline functions from this file, or you compile this file and link it

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//####ECOSGPLCOPYRIGHTEND####

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

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

//

// Author(s):   msalter

// Contributors:msalter

// Date:        2001-02-12

// Description: Simple driver for the MDSChip serial port

//

//####DESCRIPTIONEND####

//

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

#include <pkgconf/hal.h>

#include <pkgconf/system.h>

#include CYGBLD_HAL_PLATFORM_H

#include <cyg/hal/hal_arch.h>           // SAVE/RESTORE GP macros

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

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

#include <cyg/hal/hal_intr.h>           // HAL_ENABLE/MASK/UNMASK_INTERRUPTS

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

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

// We have no control over baud rate

#if CYGNUM_HAL_VIRTUAL_VECTOR_CONSOLE_CHANNEL_BAUD==57600

#define CYG_DEV_SERIAL_BAUD_DIVISOR    BAUD_57600

#endif

#ifndef CYG_DEV_SERIAL_BAUD_DIVISOR

#error Missing/incorrect serial baud rate defined - CDL error?

#endif

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

typedef struct {

    cyg_uint8* base;

    cyg_int32 msec_timeout;

    int isr_vector;

} channel_data_t;

static channel_data_t channels[1] = {

    { (cyg_uint8*)0, 1000, 0}

};

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

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

void

cyg_hal_plf_serial_init_channel(void* __ch_data)

{

    cyg_hal_plf_write_sr_rbr(0);

    cyg_hal_plf_write_sr_tbr(0);

    cyg_hal_plf_write_tbr(0);

    cyg_hal_plf_write_rbr(0);

}

void

cyg_hal_plf_serial_putc(void* __ch_data, cyg_uint8 __ch)

{

    // wait for tx rdy

    while (cyg_hal_plf_read_sr_tbr() != 0) ;

    // Now, write it

    cyg_hal_plf_write_tbr(__ch);

    // and set TBR

    cyg_hal_plf_write_sr_tbr(1);

}

static cyg_bool

cyg_hal_plf_serial_getc_nonblock(void* __ch_data, cyg_uint8* ch)

{

    if (cyg_hal_plf_read_sr_rbr() == 0)

        return false;

    *ch = cyg_hal_plf_read_rbr();

    cyg_hal_plf_write_sr_rbr(0);

    return true;

}

cyg_uint8

cyg_hal_plf_serial_getc(void* __ch_data)

{

    cyg_uint8 ch;

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

    return ch;

}

static void

cyg_hal_plf_serial_write(void* __ch_data, const cyg_uint8* __buf,

                         cyg_uint32 __len)

{

    while(__len-- > 0)

        cyg_hal_plf_serial_putc(__ch_data, *__buf++);

}

static void

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

{

    while(__len-- > 0)

        *__buf++ = cyg_hal_plf_serial_getc(__ch_data);

}

cyg_bool

cyg_hal_plf_serial_getc_timeout(void* __ch_data, cyg_uint8* ch)

{

    int delay_count;

    channel_data_t* chan;

    cyg_bool res;

    // 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);

    }

    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;

    // 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_INTERRUPT_SET_LEVEL(chan->isr_vector, 1);

        HAL_INTERRUPT_UNMASK(chan->isr_vector);

        break;

    case __COMMCTL_IRQ_DISABLE:

        ret = irq_state;

        irq_state = 0;

        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;

        va_list ap;

        va_start(ap, __func);

        baud_rate = va_arg(ap, cyg_uint32);

        va_end(ap);

        switch (baud_rate)

        {

        case 57600:  break;

        default:     return -1;

        }

    }

    break;

    case __COMMCTL_GETBAUD:

        break;

    default:

        break;

    }

    return ret;

}

static int

cyg_hal_plf_serial_isr(void *__ch_data, int* __ctrlc,

                       CYG_ADDRWORD __vector, CYG_ADDRWORD __data)

{

    *__ctrlc = 0;

    return 0;

}

static void

cyg_hal_plf_serial_init(void)

{

    hal_virtual_comm_table_t* comm;

    int cur = CYGACC_CALL_IF_SET_CONSOLE_COMM(CYGNUM_CALL_IF_SET_COMM_ID_QUERY_CURRENT);

    // Disable interrupts.

    HAL_INTERRUPT_MASK(channels[0].isr_vector);

    // Init channels

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

    // 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);

}

void

cyg_hal_plf_comms_init(void)

{

    static int initialized = 0;

    if (initialized)

        return;

    initialized = 1;

    cyg_hal_plf_serial_init();

}

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

// end of ser16c550c.c