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

//

//      sci.c

//

//      Simple driver for the H8/300 Serial Communication Interface (SCI)

//

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

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

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

//

// Author(s):   ysato

// Contributors:ysato

// Date:        2002-03-21

// Description: Simple driver for the H8/300 Serial Communication Interface

//              Clients of this file can configure the behavior with:

//              CYGNUM_SCI_PORTS:  number of SCI ports

//

//####DESCRIPTIONEND####

//

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

#include <pkgconf/hal.h>

#ifdef CYGNUM_HAL_H8300_SCI_PORTS

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

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

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

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

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

#include <cyg/hal/hal_if.h>             // Calling-if API

#include <cyg/hal/mod_regs_sci.h>       // serial register definitions

#include <cyg/hal/h8_sci.h>             // our header

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

void

cyg_hal_plf_sci_init_channel(void* chan)

{

    cyg_uint8 tmp;

    cyg_uint8* base = ((channel_data_t *)chan)->base;

    // Disable Tx/Rx interrupts, but enable Tx/Rx

    HAL_WRITE_UINT8(base+_REG_SCSCR,

                    CYGARC_REG_SCSCR_TE|CYGARC_REG_SCSCR_RE);

    // 8-1-no parity.

    HAL_WRITE_UINT8(base+_REG_SCSMR, 0);

    // Set speed to CYGNUM_HAL_H8300_SCI_DEFAULT_BAUD_RATE

    HAL_READ_UINT8(base+_REG_SCSMR, tmp);

    tmp &= ~CYGARC_REG_SCSMR_CKSx_MASK;

    tmp |= CYGARC_SCBRR_CKSx(CYGNUM_HAL_H8300_SCI_BAUD_RATE);

    HAL_WRITE_UINT8(base+_REG_SCSMR, tmp);

    HAL_WRITE_UINT8(base+_REG_SCBRR, CYGARC_SCBRR_N(CYGNUM_HAL_H8300_SCI_BAUD_RATE));

}

static cyg_bool

cyg_hal_plf_sci_getc_nonblock(void* __ch_data, cyg_uint8* ch)

{

    cyg_uint8* base = ((channel_data_t*)__ch_data)->base;

    cyg_uint8 sr;

    HAL_READ_UINT8(base+_REG_SCSSR, sr);

    if (sr & CYGARC_REG_SCSSR_ORER) {

        // Serial RX overrun. Clear error and let caller try again.

        HAL_WRITE_UINT8(base+_REG_SCSSR,

                        CYGARC_REG_SCSSR_CLEARMASK & ~CYGARC_REG_SCSSR_ORER);

        return false;

    }

    if ((sr & CYGARC_REG_SCSSR_RDRF) == 0)

        return false;

    HAL_READ_UINT8(base+_REG_SCRDR, *ch);

    // Clear buffer full flag.

    HAL_WRITE_UINT8(base+_REG_SCSSR, sr & ~CYGARC_REG_SCSSR_RDRF);

    return true;

}

cyg_uint8

cyg_hal_plf_sci_getc(void* __ch_data)

{

    cyg_uint8 ch;

    CYGARC_HAL_SAVE_GP();

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

    CYGARC_HAL_RESTORE_GP();

    return ch;

}

void

cyg_hal_plf_sci_putc(void* __ch_data, cyg_uint8 c)

{

    cyg_uint8* base = ((channel_data_t*)__ch_data)->base;

    cyg_uint8 sr;

    CYGARC_HAL_SAVE_GP();

    do {

        HAL_READ_UINT8(base+_REG_SCSSR, sr);

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

    HAL_WRITE_UINT8(base+_REG_SCTDR, c);

    // Clear empty flag.

    HAL_WRITE_UINT8(base+_REG_SCSSR, sr & ~CYGARC_REG_SCSSR_TDRE);

    // Hang around until the character has been safely sent.

    do {

        HAL_READ_UINT8(base+_REG_SCSSR, sr);

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

    CYGARC_HAL_RESTORE_GP();

}

static channel_data_t channels[CYGNUM_HAL_H8300_SCI_PORTS];

static void

cyg_hal_plf_sci_write(void* __ch_data, const cyg_uint8* __buf,

                         cyg_uint32 __len)

{

    CYGARC_HAL_SAVE_GP();

    while(__len-- > 0)

        cyg_hal_plf_sci_putc(__ch_data, *__buf++);

    CYGARC_HAL_RESTORE_GP();

}

static void

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

{

    CYGARC_HAL_SAVE_GP();

    while(__len-- > 0)

        *__buf++ = cyg_hal_plf_sci_getc(__ch_data);

    CYGARC_HAL_RESTORE_GP();

}

cyg_bool

cyg_hal_plf_sci_getc_timeout(void* __ch_data, cyg_uint8* ch)

{

    channel_data_t* chan = (channel_data_t*)__ch_data;

    int delay_count;

    cyg_bool res;

    CYGARC_HAL_SAVE_GP();

    delay_count = chan->msec_timeout * 20; // delay in .1 ms steps

    for(;;) {

        res = cyg_hal_plf_sci_getc_nonblock(__ch_data, ch);

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

            break;

        CYGACC_CALL_IF_DELAY_US(50);

    }

    CYGARC_HAL_RESTORE_GP();

    return res;

}

static int

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

{

    static int irq_state = 0;

    channel_data_t* chan = (channel_data_t*)__ch_data;

    cyg_uint8 scr;

    int ret = 0;

    CYGARC_HAL_SAVE_GP();

    switch (__func) {

    case __COMMCTL_IRQ_ENABLE:

        irq_state = 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);

    }

    default:

        break;

    }

    CYGARC_HAL_RESTORE_GP();

    return ret;

}

static int

cyg_hal_plf_sci_isr(void *__ch_data, int* __ctrlc,

                    CYG_ADDRWORD __vector, CYG_ADDRWORD __data)

{

    cyg_uint8 c, sr;

    cyg_uint8* base = ((channel_data_t*)__ch_data)->base;

    int res = 0;

    CYGARC_HAL_SAVE_GP();

    *__ctrlc = 0;

    HAL_READ_UINT8(base+_REG_SCSSR, sr);

    if (sr & CYGARC_REG_SCSSR_ORER) {

        // Serial RX overrun. Clear error and hope protocol recovers.

        HAL_WRITE_UINT8(base+_REG_SCSSR,

                        CYGARC_REG_SCSSR_CLEARMASK & ~CYGARC_REG_SCSSR_ORER);

        res = CYG_ISR_HANDLED;

    } else if (sr & CYGARC_REG_SCSSR_RDRF) {

        // Received character

        HAL_READ_UINT8(base+_REG_SCRDR, c);

        // Clear buffer full flag.

        HAL_WRITE_UINT8(base+_REG_SCSSR,

                        CYGARC_REG_SCSSR_CLEARMASK & ~CYGARC_REG_SCSSR_RDRF);

        if( cyg_hal_is_break( &c , 1 ) )

            *__ctrlc = 1;

        res = CYG_ISR_HANDLED;

    }

    CYGARC_HAL_RESTORE_GP();

    return res;

}

void

cyg_hal_plf_sci_init(int sci_index, int comm_index,

                     int rcv_vect, cyg_uint8* base)

{

    channel_data_t* chan = &channels[sci_index];

    hal_virtual_comm_table_t* comm;

    int cur = CYGACC_CALL_IF_SET_CONSOLE_COMM(CYGNUM_CALL_IF_SET_COMM_ID_QUERY_CURRENT);

    // Initialize channel table

    chan->base = base;

    chan->isr_vector = rcv_vect;

    chan->msec_timeout = 1000;

    // Disable interrupts.

    HAL_INTERRUPT_MASK(chan->isr_vector);

    // Init channel

    cyg_hal_plf_sci_init_channel(chan);

    // Setup procs in the vector table

    // Initialize channel procs

    CYGACC_CALL_IF_SET_CONSOLE_COMM(comm_index);

    comm = CYGACC_CALL_IF_CONSOLE_PROCS();

    CYGACC_COMM_IF_CH_DATA_SET(*comm, chan);

    CYGACC_COMM_IF_WRITE_SET(*comm, cyg_hal_plf_sci_write);

    CYGACC_COMM_IF_READ_SET(*comm, cyg_hal_plf_sci_read);

    CYGACC_COMM_IF_PUTC_SET(*comm, cyg_hal_plf_sci_putc);

    CYGACC_COMM_IF_GETC_SET(*comm, cyg_hal_plf_sci_getc);

    CYGACC_COMM_IF_CONTROL_SET(*comm, cyg_hal_plf_sci_control);

    CYGACC_COMM_IF_DBG_ISR_SET(*comm, cyg_hal_plf_sci_isr);

    CYGACC_COMM_IF_GETC_TIMEOUT_SET(*comm, cyg_hal_plf_sci_getc_timeout);

    // Restore original console

    CYGACC_CALL_IF_SET_CONSOLE_COMM(cur);

}

#endif // CYGNUM_HAL_H8300_SCI_PORTS

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

// end of sci.c