linux-arkmicro/buildroot-external/package/hx280enc/software/linux_reference/ewl/ewl_x280_polling.c

/*------------------------------------------------------------------------------
--                                                                            --
--       This software is confidential and proprietary and may be used        --
--        only as expressly authorized by a licensing agreement from          --
--                                                                            --
--                            Hantro Products Oy.                             --
--                                                                            --
--                   (C) COPYRIGHT 2006 HANTRO PRODUCTS OY                    --
--                            ALL RIGHTS RESERVED                             --
--                                                                            --
--                 The entire notice above must be reproduced                 --
--                  on all copies and should not be removed.                  --
--                                                                            --
--------------------------------------------------------------------------------
--
--  Abstract : Encoder Wrapper Layer for 6280/7280/8270/8290 without interrupts
--
------------------------------------------------------------------------------*/

/*------------------------------------------------------------------------------
    1. Include headers
------------------------------------------------------------------------------*/

#include "basetype.h"
#include "ewl.h"
#include "ewl_linux_lock.h"
#include "ewl_x280_common.h"

#include "hx280enc.h"

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <assert.h>

#include <errno.h>

#include <sys/types.h>
#include <unistd.h>
#include <pthread.h>

#ifndef EWL_NO_HW_TIMEOUT
#define EWL_WAIT_HW_TIMEOUT 2   /* HW IRQ timeout in seconds */
#endif

extern volatile u32 asic_status;

void HandleSIGIO(hx280ewl_t * enc)
{
    enc->sigio_needed = 0;  /* no need for SIGIO when polling */
    return;
}

/*******************************************************************************
 Function name   : EWLReserveHw
 Description     : Reserve HW resource for currently running codec
*******************************************************************************/
i32 EWLReserveHw(const void *inst)
{
    hx280ewl_t *enc = (hx280ewl_t *) inst;

    assert(enc != NULL);

    PTRACE("EWLReserveHw: PID %d trying to reserve ...\n", getpid());

    /* Check invalid parameters */
    if(inst == NULL)
        return EWL_ERROR;

    if(binary_semaphore_wait(enc->semid, 0) != 0)
    {
        PTRACE("binary_semaphore_wait error: %s\n", strerror(errno));
        return EWL_ERROR;
    }

    PTRACE("Codec semaphore locked\n");

    /* we have to lock postprocessor also */
    if(binary_semaphore_wait(enc->semid, 1) != 0)
    {
        PTRACE("binary_semaphore_wait error: %s\n", strerror(errno));
        if(binary_semaphore_post(enc->semid, 0) != 0)
        {
            PTRACE("binary_semaphore_post error: %s\n", strerror(errno));
            assert(0);
        }
        return EWL_ERROR;
    }
    PTRACE("Post-processor semaphore locked\n");
    PTRACE("EWLReserveHw: HW locked by PID %d\n", getpid());

    EWLWriteReg(inst, 0x38, 0);

    return EWL_OK;
}

/*******************************************************************************
 Function name   : EWLWaitHwRdy
 Description     : Poll the encoder interrupt register to notice IRQ
 Return type     : i32 
 Argument        : void
*******************************************************************************/
i32 EWLWaitHwRdy(const void *inst, u32 *slicesReady)
{
    hx280ewl_t *enc = (hx280ewl_t *) inst;
    volatile u32 irq_stats;
    u32 prevSlicesReady = 0;
    i32 ret = EWL_HW_WAIT_TIMEOUT;
    struct timespec t;
    u32 timeout = 1000;     /* Polling interval in microseconds */
    int loop = 100;         /* How many times to poll before timeout */

    assert(enc != NULL);

    PTRACE("EWLWaitHwRdy\n");
    (void) enc;

    /* The function should return when a slice is ready */
    if (slicesReady)
        prevSlicesReady = *slicesReady;

    if(timeout == (u32) (-1) )
    {
        loop = -1;   /* wait forever (almost) */
        timeout = 1000; /* 1ms polling interval */
    }

    t.tv_sec = 0;
    t.tv_nsec = timeout - t.tv_sec * 1000;
    t.tv_nsec = 1000 * 1000;

    do
    {
        /* Get the number of completed slices from ASIC registers. */
        if (slicesReady)
            *slicesReady = (enc->pRegBase[21] >> 16) & 0xFF;

        irq_stats = enc->pRegBase[1];

        PTRACE("EWLWaitHw: IRQ stat = %08x\n", irq_stats);

        if((irq_stats & ASIC_STATUS_ALL))
        {
            /* clear IRQ and slice ready status */
            irq_stats &= (~(ASIC_STATUS_SLICE_READY|ASIC_IRQ_LINE));
            EWLWriteReg(inst, 0x04, irq_stats);

            ret = EWL_OK;
            loop = 0;
        }

        if (slicesReady)
        {
            if (*slicesReady > prevSlicesReady)
            {
                ret = EWL_OK;
                loop = 0;
            }
        }

        if (loop)
        {
            if(nanosleep(&t, NULL) != 0)
                PTRACE("EWLWaitHw: Sleep interrupted!\n");
        }
    }
    while(loop--);

    asic_status = irq_stats; /* update the buffered asic status */

    if (slicesReady)
        PTRACE("EWLWaitHw: slicesReady = %d\n", *slicesReady);
    PTRACE("EWLWaitHw: asic_status = %x\n", asic_status);
    PTRACE("EWLWaitHw: OK!\n");

    return ret;
}