//=============================================================================
//
//      hal_diag.c
//
//      HAL diagnostic output code
//
//=============================================================================
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// for more details.                                                        
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//
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//=============================================================================
//#####DESCRIPTIONBEGIN####
//
// Author(s):   jskov
// Contributors:jskov
// Date:        2001-08-06
// Purpose:     HAL diagnostic output
// Description: Implementations of HAL diagnostic output support.
//
//####DESCRIPTIONEND####
//
//=============================================================================

#include <pkgconf/hal.h>
#include CYGBLD_HAL_VARIANT_H           // Variant specific configuration
#include CYGBLD_HAL_PLATFORM_H          // Platform specific configuration

#include <cyg/infra/cyg_type.h>         // base types
#include <cyg/infra/cyg_trac.h>         // tracing macros
#include <cyg/infra/cyg_ass.h>          // assertion macros

#include <cyg/hal/hal_arch.h>           // basic machine info
#include <cyg/hal/hal_intr.h>           // interrupt macros
#include <cyg/hal/hal_io.h>             // IO macros
#include <cyg/hal/hal_diag.h>
#include <cyg/hal/drv_api.h>
#include <cyg/hal/hal_if.h>             // interface API
#include <cyg/hal/hal_misc.h>           // Helper functions
#include <cyg/hal/excalibur.h>          // platform definitions

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

#define CYG_DEVICE_SERIAL_BAUD_DIV (CYGNUM_HAL_ARM_EXCALIBUR_PERIPHERAL_CLOCK/CYGNUM_HAL_VIRTUAL_VECTOR_CONSOLE_CHANNEL_BAUD/16)
#define CYG_DEVICE_SERIAL_BAUD_LSB (CYG_DEVICE_SERIAL_BAUD_DIV&0xff)
#define CYG_DEVICE_SERIAL_BAUD_MSB ((CYG_DEVICE_SERIAL_BAUD_DIV>>8)&0xff)

//-----------------------------------------------------------------------------
typedef struct {
    cyg_uint32 base;
    cyg_int32 msec_timeout;
    int isr_vector;
} channel_data_t;

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

static void
cyg_hal_plf_serial_init_channel(void* __ch_data)
{
    cyg_uint32 base = ((channel_data_t*)__ch_data)->base;

    // 8-1-no parity.
    HAL_WRITE_UINT32(base+_UART_MC, _UART_MC_8BIT | _UART_MC_1STOP | _UART_MC_PARITY_NONE);

    HAL_WRITE_UINT32(base+_UART_DIV_LO, CYG_DEVICE_SERIAL_BAUD_LSB);
    HAL_WRITE_UINT32(base+_UART_DIV_HI, CYG_DEVICE_SERIAL_BAUD_MSB);
    HAL_WRITE_UINT32(base+_UART_FCR, (_UART_FCR_TC | _UART_FCR_RC |
                                      _UART_FCR_TX_THR_15 | _UART_FCR_RX_THR_1));  // clear & enableFIFO

    // enable RX interrupts - otherwise ISR cannot be polled. Actual
    // interrupt control of serial happens via INT_MASK
    HAL_WRITE_UINT32(base+_UART_IES, _UART_INTS_RE);
}

void
cyg_hal_plf_serial_putc(void *__ch_data, char c)
{
    cyg_uint32 base = ((channel_data_t*)__ch_data)->base;
    cyg_uint32 tsr;
    CYGARC_HAL_SAVE_GP();

    do {
        HAL_READ_UINT32(base+_UART_TSR, tsr);
        // Wait for TXI flag to be set - or for the register to be
        // zero (works around a HW bug it seems).
    } while (tsr && (tsr & _UART_TSR_TXI) == 0);

    HAL_WRITE_UINT32(base+_UART_TD, (cyg_uint32)(unsigned char)c);

    CYGARC_HAL_RESTORE_GP();
}

static cyg_bool
cyg_hal_plf_serial_getc_nonblock(void* __ch_data, cyg_uint8* ch)
{
    cyg_uint32 base = ((channel_data_t*)__ch_data)->base;
    cyg_uint32 rsr, isr, data;

    HAL_READ_UINT32(base+_UART_ISR, isr);
    if (0 == (isr & _UART_INTS_RI)) {
        HAL_READ_UINT32(base+_UART_RSR, rsr);
        if (0 == rsr) 
            return false;
    }

    HAL_READ_UINT32(base+_UART_RD, data);
    *ch = (cyg_uint8)(data & 0xff);

    // Read RSR to clear interrupt, and RDS to clear errors
    HAL_READ_UINT32(base+_UART_RSR, data);
    HAL_READ_UINT32(base+_UART_RDS, data);

    return true;
}

cyg_uint8
cyg_hal_plf_serial_getc(void* __ch_data)
{
    cyg_uint8 ch;
    CYGARC_HAL_SAVE_GP();

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

    CYGARC_HAL_RESTORE_GP();
    return ch;
}

static channel_data_t excalibur_ser_channels[1] = {
    { (cyg_uint32)EXCALIBUR_UART0_BASE, 1000, CYGNUM_HAL_INTERRUPT_UART }
};

static void
cyg_hal_plf_serial_write(void* __ch_data, const cyg_uint8* __buf, 
                         cyg_uint32 __len)
{
    CYGARC_HAL_SAVE_GP();

    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();

    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 = (channel_data_t*)__ch_data;
    cyg_bool res;
    CYGARC_HAL_SAVE_GP();

    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 = (channel_data_t*)__ch_data;
    int ret = 0;
    CYGARC_HAL_SAVE_GP();

    switch (__func) {
    case __COMMCTL_IRQ_ENABLE:
        irq_state = 1;

        // Need to keep it enabled to allow polling using ISR
        //HAL_WRITE_UINT32(chan->base+_UART_IES, _UART_INTS_RE);

        HAL_INTERRUPT_UNMASK(chan->isr_vector);
        break;
    case __COMMCTL_IRQ_DISABLE:
        ret = irq_state;
        irq_state = 0;

        // Need to keep it enabled to allow polling using ISR
        // HAL_WRITE_UINT32(chan->base+_UART_IEC, _UART_INTS_RE);

        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_serial_isr(void *__ch_data, int* __ctrlc, 
                       CYG_ADDRWORD __vector, CYG_ADDRWORD __data)
{
    int res = 0;
    channel_data_t* chan = (channel_data_t*)__ch_data;
    cyg_uint32 isr, ch, rsr;
    char c;
    CYGARC_HAL_SAVE_GP();

    cyg_drv_interrupt_acknowledge(chan->isr_vector);

    *__ctrlc = 0;
    HAL_READ_UINT32(chan->base+_UART_ISR, isr);
    HAL_READ_UINT32(chan->base+_UART_RSR, rsr);

    // Again, check both RI and the RX FIFO count.
    if ( ((isr & _UART_INTS_RI) != 0 ) || (rsr) ) {

        HAL_READ_UINT32(chan->base+_UART_RD, ch);

        c = (char)ch;
        if( cyg_hal_is_break( &c , 1 ) )
            *__ctrlc = 1;

        res = CYG_ISR_HANDLED;
    }

    CYGARC_HAL_RESTORE_GP();
    return res;
}

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(excalibur_ser_channels[0].isr_vector);

    // Init channels
    cyg_hal_plf_serial_init_channel(&excalibur_ser_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, &excalibur_ser_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();
}

//-----------------------------------------------------------------------------
// LEDs
void
hal_diag_led(int n)
{
}

//-----------------------------------------------------------------------------
// End of hal_diag.c
