sys/dev/isa/atppc_isadma.c

   1 /* $NetBSD: atppc_isadma.c,v 1.6 2008/04/08 20:08:49 cegger Exp $ */
   2
   3 /*-
   4  * Copyright (c) 2001 Alcove - Nicolas Souchu
   5  * All rights reserved.
   6  *
   7  * Redistribution and use in source and binary forms, with or without
   8  * modification, are permitted provided that the following conditions
   9  * are met:
  10  * 1. Redistributions of source code must retain the above copyright
  11  *    notice, this list of conditions and the following disclaimer.
  12  * 2. Redistributions in binary form must reproduce the above copyright
  13  *    notice, this list of conditions and the following disclaimer in the
  14  *    documentation and/or other materials provided with the distribution.
  15  *
  16  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
  17  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  18  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  19  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
  20  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  21  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  22  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  23  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  24  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  25  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  26  * SUCH DAMAGE.
  27  *
  28  * FreeBSD: src/sys/isa/ppc.c,v 1.26.2.5 2001/10/02 05:21:45 nsouch Exp
  29  *
  30  */
  31
  32 #include <sys/cdefs.h>
  33 __KERNEL_RCSID(0, "$NetBSD: atppc_isadma.c,v 1.6 2008/04/08 20:08:49 cegger Exp $");
  34
  35 #include "opt_atppc.h"
  36
  37 #include <sys/param.h>
  38 #include <sys/systm.h>
  39 #include <sys/kernel.h>
  40 #include <sys/malloc.h>
  41 #include <sys/device.h>
  42
  43 #include <sys/intr.h>
  44 #include <sys/bus.h>
  45
  46 #include <dev/ic/atppcreg.h>
  47 #include <dev/ic/atppcvar.h>
  48
  49 #include <dev/isa/isadmavar.h>
  50 #include <dev/isa/isareg.h>
  51 #include <dev/isa/isavar.h>
  52
  53 #include <dev/isa/atppc_isadma.h>
  54
  55 /* Enable DMA */
  56 int
  57 atppc_isadma_setup(struct atppc_softc * lsc, isa_chipset_tag_t ic, int drq)
  58 {
  59         int error = 1;
  60
  61         /* Reserve DRQ */
  62         if (isa_drq_alloc(ic, drq)) {
  63                 ATPPC_DPRINTF(("%s(%s): cannot reserve DRQ line.\n", __func__,
  64                         device_xname(lsc->sc_dev)));
  65                 return error;
  66         }
  67
  68         /* Get maximum DMA size for isa bus */
  69         lsc->sc_dma_maxsize = isa_dmamaxsize(ic, drq);
  70
  71         /* Create dma mapping */
  72         error = isa_dmamap_create(ic, drq, lsc->sc_dma_maxsize,
  73                 BUS_DMA_NOWAIT|BUS_DMA_ALLOCNOW);
  74
  75         return error;
  76 }
  77
  78 /* Start DMA operation over ISA bus */
  79 int
  80 atppc_isadma_start(isa_chipset_tag_t ic, int drq, void *buf, u_int nbytes,
  81         u_int8_t mode)
  82 {
  83         return (isa_dmastart(ic, drq, buf, nbytes, NULL,
  84                 ((mode == ATPPC_DMA_MODE_WRITE) ? DMAMODE_WRITE :
  85                 DMAMODE_READ) | DMAMODE_DEMAND, ((mode == ATPPC_DMA_MODE_WRITE)
  86                 ? BUS_DMA_WRITE : BUS_DMA_READ) | BUS_DMA_NOWAIT));
  87 }
  88
  89 /* Stop DMA operation over ISA bus */
  90 int
  91 atppc_isadma_finish(isa_chipset_tag_t ic, int drq)
  92 {
  93         isa_dmadone(ic, drq);
  94         return 0;
  95 }
  96
  97 /* Abort DMA operation over ISA bus */
  98 int
  99 atppc_isadma_abort(isa_chipset_tag_t ic, int drq)
 100 {
 101         isa_dmaabort(ic, drq);
 102         return 0;
 103 }
 104
 105 /* Allocate memory for DMA over ISA bus */
 106 int
 107 atppc_isadma_malloc(isa_chipset_tag_t ic, int drq, void **buf, bus_addr_t *bus_addr, bus_size_t size)
 108 {
 109         int error;
 110
 111         error = isa_dmamem_alloc(ic, drq, size, bus_addr, BUS_DMA_WAITOK);
 112         if (error)
 113                 return error;
 114
 115         error = isa_dmamem_map(ic, drq, *bus_addr, size, buf, BUS_DMA_WAITOK);
 116         if (error)
 117                 isa_dmamem_free(ic, drq, *bus_addr, size);
 118
 119         return error;
 120 }
 121
 122 /* Free memory allocated by atppc_isadma_malloc() */
 123 void
 124 atppc_isadma_free(isa_chipset_tag_t ic, int drq, void ** buf, bus_addr_t * bus_addr, bus_size_t size)
 125 {
 126         isa_dmamem_unmap(ic, drq, *buf, size);
 127         isa_dmamem_free(ic, drq, *bus_addr, size);
 128 }