/*
 * sample_cs.c
 *
 * Sample functions showing the implementation of critical section entry/exit
 * routines and various semaphore related routines (all OS depenedent). These
 * implementations MUST be provided by the user / application, using the EDMA3
 * Resource Manager, for its correct functioning.
 *
 * Copyright (C) 2009 Texas Instruments Incorporated - http://www.ti.com/
 *
 *
 *  Redistribution and use in source and binary forms, with or without
 *  modification, are permitted provided that the following conditions
 *  are met:
 *
 *    Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 *
 *    Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the
 *    distribution.
 *
 *    Neither the name of Texas Instruments Incorporated nor the names of
 *    its contributors may be used to endorse or promote products derived
 *    from this software without specific prior written permission.
 *
 *  THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 *  "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 *  LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
 *  A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
 *  OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 *  SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 *  LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 *  DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 *  THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 *  (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 *  OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 *
*/

#include <ti/sysbios/hal/Hwi.h>
#include <ti/sysbios/knl/Task.h>
#include <ti/sysbios/ipc/Semaphore.h>

#include <ti/sdo/edma3/rm/sample/bios6_edma3_rm_sample.h>

extern unsigned int ccXferCompInt[][EDMA3_MAX_REGIONS];
extern unsigned int ccErrorInt[];
extern unsigned int tcErrorInt[][EDMA3_MAX_TC];

/**
 * Shadow Region on which the executable is running. Its value is
 * populated with the DSP Instance Number here in this case.
 */
extern unsigned int region_id;

/**
 * \brief   EDMA3 OS Protect Entry
 *
 *      This function saves the current state of protection in 'intState'
 *      variable passed by caller, if the protection level is
 *      EDMA3_OS_PROTECT_INTERRUPT. It then applies the requested level of
 *      protection.
 *      For EDMA3_OS_PROTECT_INTERRUPT_XFER_COMPLETION and
 *      EDMA3_OS_PROTECT_INTERRUPT_CC_ERROR, variable 'intState' is ignored,
 *      and the requested interrupt is disabled.
 *      For EDMA3_OS_PROTECT_INTERRUPT_TC_ERROR, '*intState' specifies the
 *      Transfer Controller number whose interrupt needs to be disabled.
 *
 * \param   level is numeric identifier of the desired degree of protection.
 * \param   intState is memory location where current state of protection is
 *      saved for future use while restoring it via edma3OsProtectExit() (Only
 *      for EDMA3_OS_PROTECT_INTERRUPT protection level).
 * \return  None
 */
void edma3OsProtectEntry (unsigned int edma3InstanceId, 
							int level, unsigned int *intState)
    {
    if (((level == EDMA3_OS_PROTECT_INTERRUPT)
        || (level == EDMA3_OS_PROTECT_INTERRUPT_TC_ERROR))
        && (intState == NULL))
        {
        return;
        }
    else
        {
        switch (level)
            {
            /* Disable all (global) interrupts */
            case EDMA3_OS_PROTECT_INTERRUPT :
                *intState = Hwi_disable();
                break;

            /* Disable scheduler */
            case EDMA3_OS_PROTECT_SCHEDULER :
				Task_disable();
                break;

            /* Disable EDMA3 transfer completion interrupt only */
            case EDMA3_OS_PROTECT_INTERRUPT_XFER_COMPLETION :
                Hwi_disableInterrupt(ccXferCompInt[edma3InstanceId][region_id]);
                break;

            /* Disable EDMA3 CC error interrupt only */
            case EDMA3_OS_PROTECT_INTERRUPT_CC_ERROR :
                Hwi_disableInterrupt(ccErrorInt[edma3InstanceId]);
                break;

            /* Disable EDMA3 TC error interrupt only */
            case EDMA3_OS_PROTECT_INTERRUPT_TC_ERROR :
                switch (*intState)
                    {
                    case 0:
                    case 1:
                    case 2:
                    case 3:
                    case 4:
                    case 5:
                    case 6:
                    case 7:
                        /* Fall through... */
                        /* Disable the corresponding interrupt */
                        Hwi_disableInterrupt(tcErrorInt[edma3InstanceId][*intState]);
                        break;

                     default:
                        break;
                    }

                break;

            default:
                break;
            }
        }
    }


/**
 * \brief   EDMA3 OS Protect Exit
 *
 *      This function undoes the protection enforced to original state
 *      as is specified by the variable 'intState' passed, if the protection
 *      level is EDMA3_OS_PROTECT_INTERRUPT.
 *      For EDMA3_OS_PROTECT_INTERRUPT_XFER_COMPLETION and
 *      EDMA3_OS_PROTECT_INTERRUPT_CC_ERROR, variable 'intState' is ignored,
 *      and the requested interrupt is enabled.
 *      For EDMA3_OS_PROTECT_INTERRUPT_TC_ERROR, 'intState' specifies the
 *      Transfer Controller number whose interrupt needs to be enabled.
 * \param   level is numeric identifier of the desired degree of protection.
 * \param   intState is original state of protection at time when the
 *      corresponding edma3OsProtectEntry() was called (Only
 *      for EDMA3_OS_PROTECT_INTERRUPT protection level).
 * \return  None
 */
void edma3OsProtectExit (unsigned int edma3InstanceId,
                        int level, unsigned int intState)
    {
    switch (level)
        {
        /* Enable all (global) interrupts */
        case EDMA3_OS_PROTECT_INTERRUPT :
            Hwi_restore(intState);
            break;

        /* Enable scheduler */
        case EDMA3_OS_PROTECT_SCHEDULER :
            Task_enable();
            break;

        /* Enable EDMA3 transfer completion interrupt only */
        case EDMA3_OS_PROTECT_INTERRUPT_XFER_COMPLETION :
            Hwi_enableInterrupt(ccXferCompInt[edma3InstanceId][region_id]);
            break;

        /* Enable EDMA3 CC error interrupt only */
        case EDMA3_OS_PROTECT_INTERRUPT_CC_ERROR :
            Hwi_enableInterrupt(ccErrorInt[edma3InstanceId]);
            break;

        /* Enable EDMA3 TC error interrupt only */
        case EDMA3_OS_PROTECT_INTERRUPT_TC_ERROR :
            switch (intState)
                {
                case 0:
                case 1:
                case 2:
                case 3:
                case 4:
                case 5:
                case 6:
                case 7:
                    /* Fall through... */
                    /* Enable the corresponding interrupt */
                    Hwi_enableInterrupt(tcErrorInt[edma3InstanceId][intState]);
                    break;

                 default:
                    break;
                }

            break;

        default:
            break;
        }
    }


/**
  * Counting Semaphore related functions (OS dependent) should be
  * called/implemented by the application. A handle to the semaphore
  * is required while opening the resource manager instance.
  */

/**
 * \brief   EDMA3 OS Semaphore Create
 *
 *      This function creates a counting semaphore with specified
 *      attributes and initial value. It should be used to create a semaphore
 *      with initial value as '1'. The semaphore is then passed by the user
 *      to the EDMA3 RM for proper sharing of resources.
 * \param   initVal [IN] is initial value for semaphore
 * \param   semParams [IN] is the semaphore attributes.
 * \param   hSem [OUT] is location to recieve the handle to just created
 *      semaphore
 * \return  EDMA3_RM_SOK if succesful, else a suitable error code.
 */
EDMA3_RM_Result edma3OsSemCreate(int initVal,
							const Semaphore_Params *semParams,
                           	EDMA3_OS_Sem_Handle *hSem)
    {
    EDMA3_RM_Result semCreateResult = EDMA3_RM_SOK;

    if(NULL == hSem)
        {
        semCreateResult = EDMA3_RM_E_INVALID_PARAM;
        }
    else
        {
        *hSem = (EDMA3_OS_Sem_Handle)Semaphore_create(initVal, semParams, NULL);
        if ( (*hSem) == NULL )
            {
            semCreateResult = EDMA3_RM_E_SEMAPHORE;
            }
        }

    return semCreateResult;
    }


/**
 * \brief   EDMA3 OS Semaphore Delete
 *
 *      This function deletes or removes the specified semaphore
 *      from the system. Associated dynamically allocated memory
 *      if any is also freed up.
 * \param   hSem [IN] handle to the semaphore to be deleted
 * \return  EDMA3_RM_SOK if succesful else a suitable error code
 */
EDMA3_RM_Result edma3OsSemDelete(EDMA3_OS_Sem_Handle hSem)
    {
    EDMA3_RM_Result semDeleteResult = EDMA3_RM_SOK;

    if(NULL == hSem)
        {
        semDeleteResult = EDMA3_RM_E_INVALID_PARAM;
        }
    else
        {
		Semaphore_delete(hSem);
        }

    return semDeleteResult;
    }


/**
 * \brief   EDMA3 OS Semaphore Take
 *
 *      This function takes a semaphore token if available.
 *      If a semaphore is unavailable, it blocks currently
 *      running thread in wait (for specified duration) for
 *      a free semaphore.
 * \param   hSem [IN] is the handle of the specified semaphore
 * \param   mSecTimeout [IN] is wait time in milliseconds
 * \return  EDMA3_RM_Result if successful else a suitable error code
 */
EDMA3_RM_Result edma3OsSemTake(EDMA3_OS_Sem_Handle hSem, int mSecTimeout)
    {
    EDMA3_RM_Result semTakeResult = EDMA3_RM_SOK;
    unsigned short semPendResult;

    if(NULL == hSem)
        {
        semTakeResult = EDMA3_RM_E_INVALID_PARAM;
        }
    else
        {
        semPendResult = Semaphore_pend(hSem, mSecTimeout);
        if (semPendResult == FALSE)
            {
            semTakeResult = EDMA3_RM_E_SEMAPHORE;
            }
        }

    return semTakeResult;
    }


/**
 * \brief   EDMA3 OS Semaphore Give
 *
 *      This function gives or relinquishes an already
 *      acquired semaphore token
 * \param   hSem [IN] is the handle of the specified semaphore
 * \return  EDMA3_RM_Result if successful else a suitable error code
 */
EDMA3_RM_Result edma3OsSemGive(EDMA3_OS_Sem_Handle hSem)
    {
    EDMA3_RM_Result semGiveResult = EDMA3_RM_SOK;

    if(NULL == hSem)
        {
        semGiveResult = EDMA3_RM_E_INVALID_PARAM;
        }
    else
        {
		Semaphore_post(hSem);
        }

    return semGiveResult;
    }

/* End of File */