FreeBSD/Linux Kernel Cross Reference
sys/dev/ic/apcdmareg.h

     /*      $NetBSD: apcdmareg.h,v 1.4 2003/09/10 11:37:13 uwe Exp $        */
     
     /*-
      * Copyright (c) 1998, 1999 The NetBSD Foundation, Inc.
      * All rights reserved.
      *
      * This code is derived from software contributed to The NetBSD Foundation
      * by Paul Kranenburg.
      *
     * Redistribution and use in source and binary forms, with or without
     * modification, are permitted provided that the following conditions
     * are met:
     * 1. Redistributions of source code must retain the above copyright
     *    notice, this list of conditions and the following disclaimer.
     * 2. 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.
     * 3. All advertising materials mentioning features or use of this software
     *    must display the following acknowledgement:
     *        This product includes software developed by the NetBSD
     *        Foundation, Inc. and its contributors.
     * 4. Neither the name of The NetBSD Foundation 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 NETBSD FOUNDATION, INC. 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 FOUNDATION 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.
     */
    
    /*
     * APC DMA hardware; from SunOS header
     * Thanks to Derrick J. Brashear for additional info on the
     * meaning of some of these bits.
     */
    #ifndef _DEV_IC_APCDMAREG_H_
    #define _DEV_IC_APCDMAREG_H_
    
    struct apc_dma {
            volatile u_int32_t dmacsr;      /* APC CSR */
            volatile u_int32_t lpad[3];     /* */
            volatile u_int32_t dmacva;      /* Capture Virtual Address */
            volatile u_int32_t dmacc;       /* Capture Count */
            volatile u_int32_t dmacnva;     /* Capture Next Virtual Address */
            volatile u_int32_t dmacnc;      /* Capture next count */
            volatile u_int32_t dmapva;      /* Playback Virtual Address */
            volatile u_int32_t dmapc;       /* Playback Count */
            volatile u_int32_t dmapnva;     /* Playback Next VAddress */
            volatile u_int32_t dmapnc;      /* Playback Next Count */
    };
    
    /* same as above but as offsets for bus_space ops */
    #define APC_DMA_CSR     0
    #define APC_DMA_CVA     16
    #define APC_DMA_CC      20
    #define APC_DMA_CNVA    24
    #define APC_DMA_CNC     28
    #define APC_DMA_PVA     32
    #define APC_DMA_PC      36
    #define APC_DMA_PNVA    40
    #define APC_DMA_PNC     44
    
    #define APC_DMA_SIZE    48
    
    /*
     * APC CSR Register bit definitions
     */
    #define APC_IP          0x00800000      /* Interrupt Pending */
    #define APC_PI          0x00400000      /* Playback interrupt */
    #define APC_CI          0x00200000      /* Capture interrupt */
    #define APC_EI          0x00100000      /* General interrupt */
    #define APC_IE          0x00080000      /* General ext int. enable */
    #define APC_PIE         0x00040000      /* Playback ext intr */
    #define APC_CIE         0x00020000      /* Capture ext intr */
    #define APC_EIE         0x00010000      /* Error ext intr */
    #define APC_PMI         0x00008000      /* Pipe empty interrupt */
    #define APC_PM          0x00004000      /* Play pipe empty */
    #define APC_PD          0x00002000      /* Playback NVA dirty */
    #define APC_PMIE        0x00001000      /* play pipe empty Int enable */
    #define APC_CM          0x00000800      /* Cap data dropped on floor */
    #define APC_CD          0x00000400      /* Capture NVA dirty */
    #define APC_CMI         0x00000200      /* Capture pipe empty interrupt */
    #define APC_CMIE        0x00000100      /* Cap. pipe empty int enable */
    #define APC_PPAUSE      0x00000080      /* Pause the play DMA */
    #define APC_CPAUSE      0x00000040      /* Pause the capture DMA */
    #define APC_CODEC_PDN   0x00000020      /* CODEC RESET */
    #define PDMA_GO         0x00000008
    #define CDMA_GO         0x00000004      /* bit 2 of the csr */
    #define APC_RESET       0x00000001      /* Reset the chip */
    
    #define APC_BITS                                        \
           "\2\30IP\27PI\26CI\25EI\24IE"                  \
           "\23PIE\22CIE\21EIE\20PMI\17PM\16PD\15PMIE"     \
           "\14CM\13CD\12CMI\11CMIE\10PPAUSE\7CPAUSE\6PDN\4PGO\3CGO"
   
   /*
    * Note that when we program CSR, we should be careful to not
    * accidentally clear any pending interrupt bits (a pending interrupt
    * reads as 1 and writing back 1 will clear), so instead of
    *
    *     dma->dmacsr |= bits;
    *
    * we should do
    *
    *     temp = dma->dmacsr & ~APC_INTR_MASK;
    *     temp |= bits;
    *     dma->dmacsr = temp;
    *
    * When clearing bits, always add APC_INTR_MASK, i.e.
    *
    *     dma->dmacsr &= ~(bits | APC_INTR_MASK);
    */
   #define APC_INTR_MASK   (APC_IP|APC_PI|APC_CI|APC_EI|APC_PMI|APC_CMI)
   
   #endif /* _DEV_IC_APCDMAREG_H_ */

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