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

//

//      sh4_scif.c

//

//      Simple driver for the SH4 Serial Communication Interface with FIFO

//

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

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

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

//

// Author(s):   jskov

// Contributors:Haruki Kashiwaya

// Date:        2000-08-09

// Description: Simple driver for the SH Serial Communication Interface

//              The driver can be used for the SCIF modules.

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

//              CYGNUM_SCIF_PORTS: number of SCI ports

//

//####DESCRIPTIONEND####

//

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

#include <pkgconf/hal.h>

#ifdef CYGNUM_HAL_SH_SH4_SCIF_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/sh_regs.h>            // serial register definitions

#include <cyg/hal/sh_stub.h>            // target_register_t

#define CYGPRI_HAL_SH_SH4_SCIF_PRIVATE

#include <cyg/hal/sh4_scif.h>           // our header

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

static void

cyg_hal_plf_scif_set_baud(cyg_uint8 *base, cyg_uint32 baud)

{

    cyg_uint16 tmp;

    // Set desired baudrate

    HAL_READ_UINT16(base+_REG_SCSMR, tmp);

    tmp &= ~CYGARC_REG_SCIF_SCSMR_CKSx_MASK;

    tmp |= CYGARC_SCBRR_CKSx(baud);

    HAL_WRITE_UINT16(base+_REG_SCSMR, tmp);

    HAL_WRITE_UINT8(base+_REG_SCBRR,

                    CYGARC_SCBRR_N(baud));

    // Let things settle: Here we should wait the equivalent of

    // one bit interval, i.e. 1/<baudrate> second, but we'll wait twice

    // that to be sure.

    CYGACC_CALL_IF_DELAY_US(2000000/baud);

}

void

cyg_hal_plf_scif_init_channel(channel_data_t* chan)

{

    cyg_uint8* base = chan->base;

    cyg_uint16 sr;

    // Disable everything.

    HAL_WRITE_UINT16(base+_REG_SCSCR, 0);

    // Reset FIFO.

    HAL_WRITE_UINT16(base+_REG_SCFCR,

                    CYGARC_REG_SCIF_SCFCR_TFRST|CYGARC_REG_SCIF_SCFCR_RFRST);

    // 8-1-no parity.

    HAL_WRITE_UINT16(base+_REG_SCSMR, 0);

    chan->baud_rate = CYGNUM_HAL_SH_SH4_SCIF_BAUD_RATE;

    cyg_hal_plf_scif_set_baud(base, CYGNUM_HAL_SH_SH4_SCIF_BAUD_RATE);

    // Clear status register (read back first).

    HAL_READ_UINT16(base+_REG_SCFSR, sr);

    HAL_WRITE_UINT16(base+_REG_SCFSR, 0);

    // Bring FIFO out of reset and set to trigger on every char in

    // FIFO (or C-c input would not be processed).

    HAL_WRITE_UINT16(base+_REG_SCFCR,

                    CYGARC_REG_SCIF_SCFCR_RTRG_1|CYGARC_REG_SCIF_SCFCR_TTRG_1);

    // Leave Tx/Rx interrupts disabled, but enable Tx/Rx

    HAL_WRITE_UINT16(base+_REG_SCSCR,

                    CYGARC_REG_SCIF_SCSCR_TE|CYGARC_REG_SCIF_SCSCR_RE);

}

static cyg_bool

cyg_hal_plf_scif_getc_nonblock(void* __ch_data, cyg_uint8* ch)

{

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

    cyg_uint16 fdr, sr;

    HAL_READ_UINT16(base+_REG_SCFDR, fdr);

    if ((fdr & CYGARC_REG_SCIF_SCFDR_RCOUNT_MASK) == 0)

        return false;

    HAL_READ_UINT8(base+_REG_SCFRDR, *ch);

    // Clear FIFO full flag (read before clearing)

    HAL_READ_UINT16(base+_REG_SCFSR, sr);

    HAL_WRITE_UINT16(base+_REG_SCFSR,

                    CYGARC_REG_SCIF_SCSSR_CLEARMASK & ~CYGARC_REG_SCIF_SCSSR_RDF);

    return true;

}

cyg_uint8

cyg_hal_plf_scif_getc(void* __ch_data)

{

    cyg_uint8 ch;

    CYGARC_HAL_SAVE_GP();

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

    CYGARC_HAL_RESTORE_GP();

    return ch;

}

void

cyg_hal_plf_scif_putc(void* __ch_data, cyg_uint8 c)

{

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

    cyg_uint16 fdr, sr;

    CYGARC_HAL_SAVE_GP();

    do {

        HAL_READ_UINT16(base+_REG_SCFDR, fdr);

    } while (((fdr & CYGARC_REG_SCIF_SCFDR_TCOUNT_MASK) >> CYGARC_REG_SCIF_SCFDR_TCOUNT_shift) == 16);

    HAL_WRITE_UINT8(base+_REG_SCFTDR, c);

    // Clear FIFO-empty/transmit end flags (read back SR first)

    HAL_READ_UINT16(base+_REG_SCFSR, sr);

    HAL_WRITE_UINT16(base+_REG_SCFSR, CYGARC_REG_SCIF_SCSSR_CLEARMASK

                     & ~(CYGARC_REG_SCIF_SCSSR_TDFE | CYGARC_REG_SCIF_SCSSR_TEND ));

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

    do {

        HAL_READ_UINT16(base+_REG_SCFDR, fdr);

    } while ((fdr & CYGARC_REG_SCIF_SCFDR_TCOUNT_MASK) != 0);

    CYGARC_HAL_RESTORE_GP();

}

static channel_data_t channels[CYGNUM_HAL_SH_SH4_SCIF_PORTS];

static void

cyg_hal_plf_scif_write(void* __ch_data, const cyg_uint8* __buf,

                         cyg_uint32 __len)

{

    CYGARC_HAL_SAVE_GP();

    while(__len-- > 0)

        cyg_hal_plf_scif_putc(__ch_data, *__buf++);

    CYGARC_HAL_RESTORE_GP();

}

static void

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

{

    CYGARC_HAL_SAVE_GP();

    while(__len-- > 0)

        *__buf++ = cyg_hal_plf_scif_getc(__ch_data);

    CYGARC_HAL_RESTORE_GP();

}

cyg_bool

cyg_hal_plf_scif_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 * 10; // delay in .1 ms steps

    for(;;) {

        res = cyg_hal_plf_scif_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_scif_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);

        HAL_READ_UINT16(chan->base+_REG_SCSCR, scr);

        scr |= CYGARC_REG_SCIF_SCSCR_RIE;

        HAL_WRITE_UINT16(chan->base+_REG_SCSCR, scr);

        break;

    case __COMMCTL_IRQ_DISABLE:

        ret = irq_state;

        irq_state = 0;

        HAL_INTERRUPT_UNMASK(chan->isr_vector);

        HAL_READ_UINT16(chan->base+_REG_SCSCR, scr);

        scr &= ~CYGARC_REG_SCIF_SCSCR_RIE;

        HAL_WRITE_UINT16(chan->base+_REG_SCSCR, scr);

        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_uint8* base = chan->base;

        va_list ap;

        va_start(ap, __func);

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

        va_end(ap);

        // Set desired baudrate

        cyg_hal_plf_scif_set_baud(base, chan->baud_rate);

    }

    break;

    case __COMMCTL_GETBAUD:

        ret = chan->baud_rate;

        break;

    default:

        break;

    }

    CYGARC_HAL_RESTORE_GP();

    return ret;

}

static int

cyg_hal_plf_scif_isr(void *__ch_data, int* __ctrlc,

                     CYG_ADDRWORD __vector, CYG_ADDRWORD __data)

{

    cyg_uint8 c;

    cyg_uint16 fdr, sr;

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

    int res = 0;

    CYGARC_HAL_SAVE_GP();

    *__ctrlc = 0;

    HAL_READ_UINT16(base+_REG_SCFDR, fdr);

    if ((fdr & CYGARC_REG_SCIF_SCFDR_RCOUNT_MASK) != 0) {

        HAL_READ_UINT8(base+_REG_SCFRDR, c);

        // Clear buffer full flag (read back first).

        HAL_READ_UINT16(base+_REG_SCFSR, sr);

        HAL_WRITE_UINT16(base+_REG_SCFSR,

                         CYGARC_REG_SCIF_SCSSR_CLEARMASK & ~CYGARC_REG_SCIF_SCSSR_RDF);

        if( cyg_hal_is_break( &c , 1 ) )

            *__ctrlc = 1;

        res = CYG_ISR_HANDLED;

    }

    CYGARC_HAL_RESTORE_GP();

    return res;

}

void

cyg_hal_plf_scif_init(int scif_index, int comm_index,

                      int rcv_vect, cyg_uint8* base)

{

    channel_data_t* chan = &channels[scif_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_scif_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_scif_write);

    CYGACC_COMM_IF_READ_SET(*comm, cyg_hal_plf_scif_read);

    CYGACC_COMM_IF_PUTC_SET(*comm, cyg_hal_plf_scif_putc);

    CYGACC_COMM_IF_GETC_SET(*comm, cyg_hal_plf_scif_getc);

    CYGACC_COMM_IF_CONTROL_SET(*comm, cyg_hal_plf_scif_control);

    CYGACC_COMM_IF_DBG_ISR_SET(*comm, cyg_hal_plf_scif_isr);

    CYGACC_COMM_IF_GETC_TIMEOUT_SET(*comm, cyg_hal_plf_scif_getc_timeout);

    // Restore original console

    CYGACC_CALL_IF_SET_CONSOLE_COMM(cur);

}

#endif // CYGNUM_HAL_SH_SH4_SCIF_PORTS

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

// end of sh4_scif.c