csl_atawritecommandreg.c

TI达芬奇dm644x各硬件模块测试代码

/*  ============================================================================
 *   Copyright (c) Texas Instruments Inc 2002, 2003, 2004, 2005
 *
 *   Use of this software is controlled by the terms and conditions found in the
 *   license agreement under which this software has been supplied.
 *   ===========================================================================
 */

/** @file  csl_ataWriteCommandReg.c
 *
 *  @brief File for functional layer of CSL API CSL_ataWriteCommandReg()
 *
 *  Path: \\(CSLPATH)\\ipmodules\\ata\\src
 *
 */

/* =============================================================================
 *  Revision History
 *  ===============
 *  08-Oct-2004 kpn Updated according to review comments
 *  24-Sep-2004 kpn Updated according to CSL Upgradation guidelines.
 *  ============================================================================
 */

#include <csl_ata.h>

/** ============================================================================
 *   @n@b CSL_ataWriteCommandReg
 *
 *   @b Description
 *   @n It writes into the command register.
 *
 *   @b Arguments
 *   @verbatim
            hAta            Handle to the ATA

            reg             CSL_AtaCmdRegWr

            regVal          Uint16
      @endverbatim
 *
 *   <b> Return Value </b>
 *   @n  Uint16  regVal
 *
 *   <b> Pre Condition </b>
 *   @n  None
 *
 *   <b> Post Condition </b>
 *   @n  The command register is loaded with regVal.
 *
 *   @b Modifies
 *   @n command register
 *
 *   @b Example
 *   @verbatim
            CSL_AtaHandle             hAta;
            CSL_AtaCmdRegWr           reg;
            Uint16                    regVal;
            ...

            regVal = CSL_ataWriteCommandReg (hAta, reg, regVal);
            ...

     @endverbatim
 *  ============================================================================
 */
Uint16 CSL_ataWriteCommandReg (
    CSL_AtaHandle               hAta,
    CSL_AtaCmdRegWr             reg,
    Uint16                      regVal
)
{
    register volatile Uint8 * addr = 0;

    addr = (hAta->ataNum == CSL_ATA_PRIMARY) ?
           CSL_ATA_CMDREGS_PRIMARY : CSL_ATA_CMDREGS_SECONDARY;

    if (reg == CSL_ATA_CMDREGWR_DATA) {
        *(Uint16 *)(addr + (int)reg) = regVal;
    }
    else {
        addr[(int)reg] = regVal;
    }

    return regVal;
}