sys/dev/isa/isadmavar.h

   1 /*      $NetBSD: isadmavar.h,v 1.24 2009/05/12 09:10:15 cegger Exp $    */
   2
   3 /*-
   4  * Copyright (c) 1997, 1998, 2000 The NetBSD Foundation, Inc.
   5  * All rights reserved.
   6  *
   7  * This code is derived from software contributed to The NetBSD Foundation
   8  * by Jason R. Thorpe of the Numerical Aerospace Simulation Facility,
   9  * NASA Ames Research Center.
  10  *
  11  * Redistribution and use in source and binary forms, with or without
  12  * modification, are permitted provided that the following conditions
  13  * are met:
  14  * 1. Redistributions of source code must retain the above copyright
  15  *    notice, this list of conditions and the following disclaimer.
  16  * 2. Redistributions in binary form must reproduce the above copyright
  17  *    notice, this list of conditions and the following disclaimer in the
  18  *    documentation and/or other materials provided with the distribution.
  19  *
  20  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
  21  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
  22  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  23  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
  24  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  25  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  26  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
  27  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
  28  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  29  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
  30  * POSSIBILITY OF SUCH DAMAGE.
  31  */
  32
  33 #ifndef _DEV_ISA_ISADMAVAR_H_
  34 #define _DEV_ISA_ISADMAVAR_H_
  35
  36 #define DMAMODE_WRITE           0x00
  37 #define DMAMODE_READ            0x01
  38 #define DMAMODE_SINGLE          0x00
  39 #define DMAMODE_DEMAND          0x02
  40 #define DMAMODE_LOOP            0x04
  41 #define DMAMODE_LOOPDEMAND      (DMAMODE_LOOP | DMAMODE_DEMAND)
  42
  43 /*
  44  * ISA DMA state.  This structure is provided by the ISA chipset
  45  * DMA entry points to the generic back-end functions that actually
  46  * frob the controller.
  47  */
  48 struct isa_dma_state {
  49         device_t ids_dev;               /* associated device (for dv_xname) */
  50         bus_space_tag_t ids_bst;        /* bus space tag for DMA controller */
  51         bus_space_handle_t ids_dma1h;   /* handle for DMA controller #1 */
  52         bus_space_handle_t ids_dma2h;   /* handle for DMA controller #2 */
  53         bus_space_handle_t ids_dmapgh;  /* handle for DMA page registers */
  54         bus_dma_tag_t ids_dmat;         /* DMA tag for DMA controller */
  55         bus_dmamap_t ids_dmamaps[8];    /* DMA maps for each channel */
  56         bus_size_t ids_dmalength[8];    /* size of DMA transfer per channel */
  57         bus_size_t ids_maxsize[8];      /* max size per channel */
  58         int     ids_drqmap;             /* available DRQs (bitmap) */
  59         int     ids_dmareads;           /* state for isa_dmadone() (bitmap) */
  60         int     ids_dmafinished;        /* DMA completion state (bitmap) */
  61         int     ids_masked;             /* masked channels (bitmap) */
  62         int     ids_frozen;             /* `frozen' count */
  63         int     ids_initialized;        /* only initialize once... */
  64 };
  65
  66 #define ISA_DMA_DRQ_ISFREE(state, drq)                                  \
  67         (((state)->ids_drqmap & (1 << (drq))) == 0)
  68
  69 #define ISA_DMA_DRQ_ALLOC(state, drq)                                   \
  70         (state)->ids_drqmap |= (1 << (drq))
  71
  72 #define ISA_DMA_DRQ_FREE(state, drq)                                    \
  73         (state)->ids_drqmap &= ~(1 << (drq))
  74
  75 #define ISA_DMA_MASK_SET(state, drq)                                    \
  76         (state)->ids_masked |= (1 << (drq))
  77
  78 #define ISA_DMA_MASK_CLR(state, drq)                                    \
  79         (state)->ids_masked &= ~(1 << (drq))
  80
  81 /*
  82  * Memory list used by _isa_malloc().
  83  */
  84 struct isa_mem {
  85         struct isa_dma_state *ids;
  86         int chan;
  87         bus_size_t size;
  88         bus_addr_t addr;
  89         void *kva;
  90         struct isa_mem *next;
  91 };
  92
  93 #ifdef _KERNEL
  94 struct proc;
  95 struct malloc_type;
  96
  97 void       _isa_dmainit(struct isa_dma_state *, bus_space_tag_t,
  98                bus_dma_tag_t, device_t);
  99
 100 void       _isa_dmadestroy(struct isa_dma_state *);
 101
 102 int        _isa_dmacascade(struct isa_dma_state *, int);
 103 int        _isa_dmacascade_stop(struct isa_dma_state *, int);
 104
 105 bus_size_t _isa_dmamaxsize(struct isa_dma_state *, int);
 106
 107 int        _isa_dmamap_create(struct isa_dma_state *, int, bus_size_t, int);
 108 void       _isa_dmamap_destroy(struct isa_dma_state *, int);
 109
 110 int        _isa_dmastart(struct isa_dma_state *, int, void *, bus_size_t,
 111                struct proc *, int, int);
 112 void       _isa_dmaabort(struct isa_dma_state *, int);
 113 bus_size_t _isa_dmacount(struct isa_dma_state *, int);
 114 int        _isa_dmafinished(struct isa_dma_state *, int);
 115 void       _isa_dmadone(struct isa_dma_state *, int);
 116
 117 void       _isa_dmafreeze(struct isa_dma_state *);
 118 void       _isa_dmathaw(struct isa_dma_state *);
 119
 120 int        _isa_dmamem_alloc(struct isa_dma_state *, int, bus_size_t,
 121                bus_addr_t *, int);
 122 void       _isa_dmamem_free(struct isa_dma_state *, int, bus_addr_t,
 123                bus_size_t);
 124 int        _isa_dmamem_map(struct isa_dma_state *, int, bus_addr_t,
 125                bus_size_t, void **, int);
 126 void       _isa_dmamem_unmap(struct isa_dma_state *, int, void *,
 127                size_t);
 128 paddr_t    _isa_dmamem_mmap(struct isa_dma_state *, int, bus_addr_t,
 129                bus_size_t, off_t, int, int);
 130
 131 int        _isa_drq_alloc(struct isa_dma_state *, int);
 132 int        _isa_drq_free(struct isa_dma_state *, int);
 133 int        _isa_drq_isfree(struct isa_dma_state *, int);
 134
 135 void      *_isa_malloc(struct isa_dma_state *, int, size_t,
 136                 struct malloc_type *, int);
 137 void       _isa_free(void *, struct malloc_type *);
 138 paddr_t    _isa_mappage(void *, off_t, int);
 139 #endif /* _KERNEL */
 140
 141 #endif /* _DEV_ISA_ISADMAVAR_H_ */