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dmavar.h revision 1.8 
      1 /*	$NetBSD: dmavar.h,v 1.8 2007/03/04 06:00:52 christos Exp $ */
      2 
      3 /*
      4  * Copyright (c) 1994 Peter Galbavy.  All rights reserved.
      5  * Redistribution and use in source and binary forms, with or without
      6  * modification, are permitted provided that the following conditions
      7  * are met:
      8  * 1. Redistributions of source code must retain the above copyright
      9  *    notice, this list of conditions and the following disclaimer.
     10  * 2. Redistributions in binary form must reproduce the above copyright
     11  *    notice, this list of conditions and the following disclaimer in the
     12  *    documentation and/or other materials provided with the distribution.
     13  * 3. All advertising materials mentioning features or use of this software
     14  *    must display the following acknowledgement:
     15  *	This product includes software developed by Peter Galbavy.
     16  * 4. The name of the author may not be used to endorse or promote products
     17  *    derived from this software without specific prior written permission.
     18  *
     19  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
     20  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
     21  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
     22  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
     23  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
     24  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
     25  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
     26  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
     27  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
     28  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     29  */
     30 
     31 struct dma_softc {
     32 	struct device sc_dev;			/* us as a device */
     33 	bus_space_tag_t sc_bst;			/* bus space tag */
     34 	bus_dma_tag_t sc_dmatag;		/* bus dma tag */
     35 
     36 	bus_space_handle_t sc_bsh;		/* bus space handle */
     37 	void *sc_client;			/* my client */
     38 
     39 	int	sc_active;			/* DMA active ? */
     40 	bus_dmamap_t sc_dmamap;			/* bus dma map */
     41 	u_int	sc_rev;				/* revision */
     42 	int	sc_burst;			/* DVMA burst size in effect */
     43 	size_t	sc_dmasize;
     44 	void *	*sc_dmaaddr;
     45 	size_t  *sc_dmalen;
     46 #if 0
     47 	void (*reset)(struct dma_softc *);	/* reset routine */
     48 	int (*intr)(struct dma_softc *);	/* interrupt ! */
     49 	int (*setup)(struct dma_softc *, void **, size_t *, int, size_t *);
     50 #endif
     51 };
     52 
     53 #define DMA_GCSR(sc)		\
     54 	bus_space_read_4((sc)->sc_bst, (sc)->sc_bsh, DMA_REG_CSR)
     55 #define DMA_SCSR(sc, csr)	\
     56 	bus_space_write_4((sc)->sc_bst, (sc)->sc_bsh, DMA_REG_CSR, (csr))
     57 
     58 /*
     59  * DMA engine interface functions.
     60  */
     61 #if 0
     62 #define DMA_RESET(sc)			(((sc)->reset)(sc))
     63 #define DMA_INTR(sc)			(((sc)->intr)(sc))
     64 #define DMA_SETUP(sc, a, l, d, s)	(((sc)->setup)(sc, a, l, d, s))
     65 #endif
     66 
     67 #define DMA_ISACTIVE(sc)		((sc)->sc_active)
     68 
     69 #define DMA_ENINTR(sc) do {			\
     70 	uint32_t _csr = DMA_GCSR(sc);		\
     71 	_csr |= D_INT_EN;			\
     72 	DMA_SCSR(sc, _csr);			\
     73 } while (/* CONSTCOND */0)
     74 
     75 #define DMA_ISINTR(sc)	(DMA_GCSR(sc) & (D_INT_PEND|D_ERR_PEND))
     76 
     77 #define DMA_GO(sc) do {				\
     78 	uint32_t _csr = DMA_GCSR(sc);		\
     79 	_csr |= D_EN_DMA;			\
     80 	DMA_SCSR(sc, _csr);			\
     81 	sc->sc_active = 1;			\
     82 } while (/* CONSTCOND */0)
     83 
     84 #define DMA_STOP(sc) do {			\
     85 	uint32_t _csr = DMA_GCSR(sc);		\
     86 	_csr &= ~D_EN_DMA;			\
     87 	DMA_SCSR(sc, _csr);			\
     88 	sc->sc_active = 0;			\
     89 } while (/* CONSTCOND */0)
     90 
     91 struct dma_softc *espdmafind(int);
     92 int espdmaintr(struct dma_softc *);
     93 
     94 void dma_reset(struct dma_softc *);
     95 int  dma_setup(struct dma_softc *, void **, size_t *, int, size_t *);
     96 
     97