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apcdmareg.h revision 1.1 
      1 /*	$NetBSD: apcdmareg.h,v 1.1 1999/06/05 14:29:10 mrg Exp $	*/
      2 
      3 /*-
      4  * Copyright (c) 1998, 1999 The NetBSD Foundation, Inc.
      5  * All rights reserved.
      6  *
      7  * This code is derived from software contributed to The NetBSD Foundation
      8  * by Paul Kranenburg.
      9  *
     10  * Redistribution and use in source and binary forms, with or without
     11  * modification, are permitted provided that the following conditions
     12  * are met:
     13  * 1. Redistributions of source code must retain the above copyright
     14  *    notice, this list of conditions and the following disclaimer.
     15  * 2. Redistributions in binary form must reproduce the above copyright
     16  *    notice, this list of conditions and the following disclaimer in the
     17  *    documentation and/or other materials provided with the distribution.
     18  * 3. All advertising materials mentioning features or use of this software
     19  *    must display the following acknowledgement:
     20  *        This product includes software developed by the NetBSD
     21  *        Foundation, Inc. and its contributors.
     22  * 4. Neither the name of The NetBSD Foundation nor the names of its
     23  *    contributors may be used to endorse or promote products derived
     24  *    from this software without specific prior written permission.
     25  *
     26  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
     27  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
     28  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
     29  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
     30  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
     31  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
     32  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
     33  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
     34  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
     35  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
     36  * POSSIBILITY OF SUCH DAMAGE.
     37  */
     38 
     39 /*
     40  * APC DMA hardware; from SunOS header
     41  * Thanks to Derrick J. Brashear for additional info on the
     42  * meaning of some of these bits.
     43  */
     44 struct apc_dma {
     45 	volatile u_int32_t dmacsr;	/* APC CSR */
     46 	volatile u_int32_t lpad[3];	/* */
     47 	volatile u_int32_t dmacva;	/* Capture Virtual Address */
     48 	volatile u_int32_t dmacc;	/* Capture Count */
     49 	volatile u_int32_t dmacnva;	/* Capture Next Virtual Address */
     50 	volatile u_int32_t dmacnc;	/* Capture next count */
     51 	volatile u_int32_t dmapva;	/* Playback Virtual Address */
     52 	volatile u_int32_t dmapc;	/* Playback Count */
     53 	volatile u_int32_t dmapnva;	/* Playback Next VAddress */
     54 	volatile u_int32_t dmapnc;	/* Playback Next Count */
     55 };
     56 
     57 /*
     58  * APC CSR Register bit definitions
     59  */
     60 #define	APC_IP		0x00800000	/* Interrupt Pending */
     61 #define	APC_PI		0x00400000	/* Playback interrupt */
     62 #define	APC_CI		0x00200000	/* Capture interrupt */
     63 #define	APC_EI		0x00100000	/* General interrupt */
     64 #define	APC_IE		0x00080000	/* General ext int. enable */
     65 #define	APC_PIE		0x00040000	/* Playback ext intr */
     66 #define	APC_CIE		0x00020000	/* Capture ext intr */
     67 #define	APC_EIE		0x00010000	/* Error ext intr */
     68 #define	APC_PMI		0x00008000	/* Pipe empty interrupt */
     69 #define	APC_PM		0x00004000	/* Play pipe empty */
     70 #define	APC_PD		0x00002000	/* Playback NVA dirty */
     71 #define	APC_PMIE	0x00001000	/* play pipe empty Int enable */
     72 #define	APC_CM		0x00000800	/* Cap data dropped on floor */
     73 #define	APC_CD		0x00000400	/* Capture NVA dirty */
     74 #define	APC_CMI		0x00000200	/* Capture pipe empty interrupt */
     75 #define	APC_CMIE	0x00000100	/* Cap. pipe empty int enable */
     76 #define	APC_PPAUSE	0x00000080	/* Pause the play DMA */
     77 #define	APC_CPAUSE	0x00000040	/* Pause the capture DMA */
     78 #define	APC_CODEC_PDN   0x00000020	/* CODEC RESET */
     79 #define	PDMA_GO		0x00000008
     80 #define	CDMA_GO		0x00000004	/* bit 2 of the csr */
     81 #define	APC_RESET	0x00000001	/* Reset the chip */
     82 
     83 #define APC_BITS					\
     84 	"\20\30IP\27PI\26CI\25EI\24IE"			\
     85 	"\23PIE\22CIE\21EIE\20PMI\17PM\16PD\15PMIE"	\
     86 	"\14CM\13CD\12CMI\11CMIE\10PPAUSE\7CPAUSE\6PDN\4PGO\3CGO"
     87 
     88 /*
     89  * To start DMA, you write to dma[cp]nva and dma[cp]nc and set [CP]DMA_GO
     90  * in dmacsr. dma[cp]va and dma[cp]c, when read, appear to be the live
     91  * counter as the DMA operation progresses.
     92  * Supposedly, you get an interrupt with the "dirty" bits (APC_PD,APC_CD)
     93  * set, when the next DMA buffer can be programmed, while the current one
     94  * is still in progress. We don't currently use this feature, since I
     95  * haven't been able to make it work.. instead the next buffer goes in
     96  * as soon as we see a "pipe empty" (APC_PM) interrupt.
     97  */
     98 
     99 /* It's not clear if there's a maximum DMA size.. */
    100 #define APC_MAX		(sc->sc_blksz)/*(16*1024)*/
    101 
    102 /*
    103  * List of device memory allocations (see cs4231_malloc/cs4231_free).
    104  */
    105 struct cs_dma {
    106 	struct	cs_dma *next;
    107 	caddr_t	addr;
    108 	bus_dma_segment_t segs[1];
    109 	int	nsegs;
    110 	size_t	size;
    111 };
    112