1 /* $OpenBSD: irongate_dma.c,v 1.5 2008/06/26 05:42:08 ray Exp $ */
2 /* $NetBSD: irongate_dma.c,v 1.3 2000/06/29 08:58:47 mrg Exp $ */
3
4 /*-
5 * Copyright (c) 2000 The NetBSD Foundation, Inc.
6 * All rights reserved.
7 *
8 * This code is derived from software contributed to The NetBSD Foundation
9 * by Jason R. Thorpe.
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 /*
34 * DMA support for the AMD 751 (``Irongate'') core logic chipset.
35 *
36 * The AMD 751 is really unlike all of the other Alpha PCI core logic
37 * chipsets. Instead, it looks like a normal PC chipset (not surprising,
38 * since it is used for Athlon processors).
39 *
40 * Because of this, it lacks all of the SGMAP hardware normally present
41 * on an Alpha system, and there are no DMA windows. Instead, a memory
42 * bus address is a PCI DMA address, and ISA DMA above 16M has to be
43 * bounced (this is not unlike the Jensen, actually).
44 */
45
46 /*
47 * XXX - We should define this before including bus.h, but since other stuff
48 * pulls in bus.h we must do this here.
49 */
50 #define _ALPHA_BUS_DMA_PRIVATE
51
52 #include <sys/param.h>
53 #include <sys/systm.h>
54 #include <sys/kernel.h>
55 #include <sys/device.h>
56 #include <sys/malloc.h>
57
58 #include <uvm/uvm_extern.h>
59
60 #include <machine/bus.h>
61
62 #include <dev/pci/pcireg.h>
63 #include <dev/pci/pcivar.h>
64
65 #include <alpha/pci/irongatereg.h>
66 #include <alpha/pci/irongatevar.h>
67
68 #include <dev/isa/isareg.h>
69 #include <dev/isa/isavar.h>
70
71 #include "isadma.h"
72
73 bus_dma_tag_t irongate_dma_get_tag(bus_dma_tag_t, alpha_bus_t);
74
75 void
irongate_dma_init(struct irongate_config * icp)76 irongate_dma_init(struct irongate_config *icp)
77 {
78 bus_dma_tag_t t;
79
80 /*
81 * Initialize the DMA tag used for PCI DMA.
82 */
83 t = &icp->ic_dmat_pci;
84 t->_cookie = icp;
85 t->_wbase = 0;
86 t->_wsize = 0x100000000UL;
87 t->_next_window = NULL;
88 t->_boundary = 0;
89 t->_sgmap = NULL;
90 t->_get_tag = irongate_dma_get_tag;
91 t->_dmamap_create = _bus_dmamap_create;
92 t->_dmamap_destroy = _bus_dmamap_destroy;
93 t->_dmamap_load = _bus_dmamap_load_direct;
94 t->_dmamap_load_mbuf = _bus_dmamap_load_mbuf_direct;
95 t->_dmamap_load_uio = _bus_dmamap_load_uio_direct;
96 t->_dmamap_load_raw = _bus_dmamap_load_raw_direct;
97 t->_dmamap_unload = _bus_dmamap_unload;
98 t->_dmamap_sync = _bus_dmamap_sync;
99
100 t->_dmamem_alloc = _bus_dmamem_alloc;
101 t->_dmamem_free = _bus_dmamem_free;
102 t->_dmamem_map = _bus_dmamem_map;
103 t->_dmamem_unmap = _bus_dmamem_unmap;
104 t->_dmamem_mmap = _bus_dmamem_mmap;
105
106 #if NISADMA > 0
107 /*
108 * Initialize the DMA tag used for ISA DMA.
109 */
110 t = &icp->ic_dmat_isa;
111 t->_cookie = icp;
112 t->_wbase = 0;
113 t->_wsize = 0x1000000;
114 t->_next_window = NULL;
115 t->_boundary = 0;
116 t->_sgmap = NULL;
117 t->_get_tag = irongate_dma_get_tag;
118 t->_dmamap_create = isadma_bounce_dmamap_create;
119 t->_dmamap_destroy = isadma_bounce_dmamap_destroy;
120 t->_dmamap_load = isadma_bounce_dmamap_load;
121 t->_dmamap_load_mbuf = isadma_bounce_dmamap_load_mbuf;
122 t->_dmamap_load_uio = isadma_bounce_dmamap_load_uio;
123 t->_dmamap_load_raw = isadma_bounce_dmamap_load_raw;
124 t->_dmamap_unload = isadma_bounce_dmamap_unload;
125 t->_dmamap_sync = isadma_bounce_dmamap_sync;
126
127 t->_dmamem_alloc = isadma_bounce_dmamem_alloc;
128 t->_dmamem_free = _bus_dmamem_free;
129 t->_dmamem_map = _bus_dmamem_map;
130 t->_dmamem_unmap = _bus_dmamem_unmap;
131 t->_dmamem_mmap = _bus_dmamem_mmap;
132 #endif
133
134 /* XXX XXX BEGIN XXX XXX */
135 { /* XXX */
136 extern paddr_t alpha_XXX_dmamap_or; /* XXX */
137 alpha_XXX_dmamap_or = 0; /* XXX */
138 } /* XXX */
139 /* XXX XXX END XXX XXX */
140 }
141
142 /*
143 * Return the bus dma tag to be used for the specified bus type.
144 * INTERNAL USE ONLY!
145 */
146 bus_dma_tag_t
irongate_dma_get_tag(bus_dma_tag_t t,alpha_bus_t bustype)147 irongate_dma_get_tag(bus_dma_tag_t t, alpha_bus_t bustype)
148 {
149 struct irongate_config *icp = t->_cookie;
150
151 switch (bustype) {
152 case ALPHA_BUS_PCI:
153 case ALPHA_BUS_EISA:
154 /*
155 * Busses capable of 32-bit DMA get the PCI DMA tag.
156 */
157 return (&icp->ic_dmat_pci);
158
159 case ALPHA_BUS_ISA:
160 /*
161 * Lame 24-bit busses have to bounce.
162 */
163 return (&icp->ic_dmat_isa);
164
165 default:
166 panic("irongate_dma_get_tag: shouldn't be here, really...");
167 }
168 }
169