csl_atareadcommandreg.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_ataReadCommandReg.c
 *
 *  @brief File for functional layer of CSL API CSL_ataReadCommandReg()
 *
 *  Path: \\(CSLPATH)\\ipmodules\\ata\\src
 *
 */

/* =============================================================================
 *  Revision History
 *  ===============
 *  08-Oct-2004 kpn Added variable RegData & code to simplify return statement
 *  24-Sep-2004 kpn Updated according to CSL Upgradation guidelines.
 *  ============================================================================
 */

#include <csl_ata.h>

/** ============================================================================
 *   @n@b CSL_ataReadCommandReg
 *
 *   @b Description
 *   @n It reads from the command register.
 *
 *   @b Arguments
 *   @verbatim
            hAta            Handle to the ATA

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

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

     @endverbatim
 *  ============================================================================
 */
Uint16 CSL_ataReadCommandReg (
    CSL_AtaHandle              hAta,
    CSL_AtaCmdRegRd            reg
)
{
    register volatile Uint8 *addr = 0;

    volatile Uint16 regData;

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

    regData = (reg == CSL_ATA_CMDREGRD_DATA) ?
              *(Uint16 *)(addr + (int)reg) : addr[reg];

    return regData;
}