xref: /netbsd/sys/dev/isa/atppc_isadma.c (revision 6550d01e)
1 /* $NetBSD: atppc_isadma.c,v 1.7 2008/04/15 15:02:28 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 1.7 2008/04/15 15:02:28 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 }
129