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 */
56int
57atppc_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 */
79int
80atppc_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 */
90int
91atppc_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 */
98int
99atppc_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 */
106int
107atppc_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() */
123void
124atppc_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}
129