1 /* $NetBSD: irongate_dma.c,v 1.10 2021/07/04 22:42:36 thorpej Exp $ */
2
3 /*-
4 * Copyright (c) 2000, 2020 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.
9 *
10 * Redistribution and use in source and binary forms, with or without
11 * modification, are permitted provided that the following conditions
12 * are met:
13 * 1. Redistributions of source code must retain the above copyright
14 * notice, this list of conditions and the following disclaimer.
15 * 2. Redistributions in binary form must reproduce the above copyright
16 * notice, this list of conditions and the following disclaimer in the
17 * documentation and/or other materials provided with the distribution.
18 *
19 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
20 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
21 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
22 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
23 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
24 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
25 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
26 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
27 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
28 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
29 * POSSIBILITY OF SUCH DAMAGE.
30 */
31
32 /*
33 * DMA support for the AMD 751 (``Irongate'') core logic chipset.
34 *
35 * The AMD 751 is really unlike all of the other Alpha PCI core logic
36 * chipsets. Instead, it looks like a normal PC chipset (not surprising,
37 * since it is used for Athlon processors).
38 *
39 * Because of this, it lacks all of the SGMAP hardware normally present
40 * on an Alpha system, and there are no DMA windows. Instead, a memory
41 * bus address is a PCI DMA address, and ISA DMA above 16M has to be
42 * bounced (this is not unlike the Jensen, actually).
43 */
44
45 #include <sys/cdefs.h> /* RCS ID & Copyright macro defns */
46
47 __KERNEL_RCSID(0, "$NetBSD: irongate_dma.c,v 1.10 2021/07/04 22:42:36 thorpej Exp $");
48
49 #include <sys/param.h>
50 #include <sys/systm.h>
51 #include <sys/kernel.h>
52 #include <sys/device.h>
53
54 #define _ALPHA_BUS_DMA_PRIVATE
55 #include <sys/bus.h>
56
57 #include <dev/pci/pcireg.h>
58 #include <dev/pci/pcivar.h>
59
60 #include <alpha/pci/irongatereg.h>
61 #include <alpha/pci/irongatevar.h>
62
63 #include <dev/isa/isareg.h>
64 #include <dev/isa/isavar.h>
65
66 #include <machine/alpha.h>
67
68 static bus_dma_tag_t irongate_dma_get_tag(bus_dma_tag_t, alpha_bus_t);
69
70 void
irongate_page_physload(unsigned long const start_pfn,unsigned long const end_pfn)71 irongate_page_physload(unsigned long const start_pfn,
72 unsigned long const end_pfn)
73 {
74 /*
75 * The Irongate does not have SGMAP DMA. For this reason, we
76 * need to protect the first 16MB of RAM from random allocations
77 * in order to give ISA DMA a snowball's chance of working.
78 */
79 alpha_page_physload_sheltered(start_pfn, end_pfn,
80 0, alpha_btop(0x1000000));
81 }
82
83 void
irongate_dma_init(struct irongate_config * icp)84 irongate_dma_init(struct irongate_config *icp)
85 {
86 bus_dma_tag_t t;
87
88 /*
89 * Initialize the DMA tag used for PCI DMA.
90 */
91 t = &icp->ic_dmat_pci;
92 t->_cookie = icp;
93 t->_wbase = 0;
94 t->_wsize = 0x100000000UL;
95 t->_next_window = NULL;
96 t->_boundary = 0;
97 t->_sgmap = NULL;
98 t->_get_tag = irongate_dma_get_tag;
99 t->_dmamap_create = _bus_dmamap_create;
100 t->_dmamap_destroy = _bus_dmamap_destroy;
101 t->_dmamap_load = _bus_dmamap_load_direct;
102 t->_dmamap_load_mbuf = _bus_dmamap_load_mbuf_direct;
103 t->_dmamap_load_uio = _bus_dmamap_load_uio_direct;
104 t->_dmamap_load_raw = _bus_dmamap_load_raw_direct;
105 t->_dmamap_unload = _bus_dmamap_unload;
106 t->_dmamap_sync = _bus_dmamap_sync;
107
108 t->_dmamem_alloc = _bus_dmamem_alloc;
109 t->_dmamem_free = _bus_dmamem_free;
110 t->_dmamem_map = _bus_dmamem_map;
111 t->_dmamem_unmap = _bus_dmamem_unmap;
112 t->_dmamem_mmap = _bus_dmamem_mmap;
113
114 /*
115 * Initialize the DMA tag used for ISA DMA.
116 */
117 t = &icp->ic_dmat_isa;
118 t->_cookie = icp;
119 t->_wbase = 0;
120 t->_wsize = 0x1000000;
121 t->_next_window = NULL;
122 t->_boundary = 0;
123 t->_sgmap = NULL;
124 t->_get_tag = irongate_dma_get_tag;
125 t->_dmamap_create = isadma_bounce_dmamap_create;
126 t->_dmamap_destroy = isadma_bounce_dmamap_destroy;
127 t->_dmamap_load = isadma_bounce_dmamap_load;
128 t->_dmamap_load_mbuf = isadma_bounce_dmamap_load_mbuf;
129 t->_dmamap_load_uio = isadma_bounce_dmamap_load_uio;
130 t->_dmamap_load_raw = isadma_bounce_dmamap_load_raw;
131 t->_dmamap_unload = isadma_bounce_dmamap_unload;
132 t->_dmamap_sync = isadma_bounce_dmamap_sync;
133
134 t->_dmamem_alloc = isadma_bounce_dmamem_alloc;
135 t->_dmamem_free = _bus_dmamem_free;
136 t->_dmamem_map = _bus_dmamem_map;
137 t->_dmamem_unmap = _bus_dmamem_unmap;
138 t->_dmamem_mmap = _bus_dmamem_mmap;
139 }
140
141 /*
142 * Return the bus dma tag to be used for the specified bus type.
143 * INTERNAL USE ONLY!
144 */
145 static bus_dma_tag_t
irongate_dma_get_tag(bus_dma_tag_t t,alpha_bus_t bustype)146 irongate_dma_get_tag(bus_dma_tag_t t, alpha_bus_t bustype)
147 {
148 struct irongate_config *icp = t->_cookie;
149
150 switch (bustype) {
151 case ALPHA_BUS_PCI:
152 case ALPHA_BUS_EISA:
153 /*
154 * Busses capable of 32-bit DMA get the PCI DMA tag.
155 */
156 return (&icp->ic_dmat_pci);
157
158 case ALPHA_BUS_ISA:
159 /*
160 * Lame 24-bit busses have to bounce.
161 */
162 return (&icp->ic_dmat_isa);
163
164 default:
165 panic("irongate_dma_get_tag: shouldn't be here, really...");
166 }
167 }
168