Annotation of sys/arch/alpha/pci/irongate_dma.c, Revision 1.1.1.1
1.1 nbrk 1: /* $OpenBSD: irongate_dma.c,v 1.4 2001/11/06 19:53:13 miod 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: * 3. All advertising materials mentioning features or use of this software
20: * must display the following acknowledgement:
21: * This product includes software developed by the NetBSD
22: * Foundation, Inc. and its contributors.
23: * 4. Neither the name of The NetBSD Foundation nor the names of its
24: * contributors may be used to endorse or promote products derived
25: * from this software without specific prior written permission.
26: *
27: * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
28: * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
29: * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
30: * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
31: * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
32: * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
33: * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
34: * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
35: * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
36: * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
37: * POSSIBILITY OF SUCH DAMAGE.
38: */
39:
40: /*
41: * DMA support for the AMD 751 (``Irongate'') core logic chipset.
42: *
43: * The AMD 751 is really unlike all of the other Alpha PCI core logic
44: * chipsets. Instead, it looks like a normal PC chipset (not surprising,
45: * since it is used for Athlon processors).
46: *
47: * Because of this, it lacks all of the SGMAP hardware normally present
48: * on an Alpha system, and there are no DMA windows. Instead, a memory
49: * bus address is a PCI DMA address, and ISA DMA above 16M has to be
50: * bounced (this is not unlike the Jensen, actually).
51: */
52:
53: /*
54: * XXX - We should define this before including bus.h, but since other stuff
55: * pulls in bus.h we must do this here.
56: */
57: #define _ALPHA_BUS_DMA_PRIVATE
58:
59: #include <sys/param.h>
60: #include <sys/systm.h>
61: #include <sys/kernel.h>
62: #include <sys/device.h>
63: #include <sys/malloc.h>
64:
65: #include <uvm/uvm_extern.h>
66:
67: #include <machine/bus.h>
68:
69: #include <dev/pci/pcireg.h>
70: #include <dev/pci/pcivar.h>
71:
72: #include <alpha/pci/irongatereg.h>
73: #include <alpha/pci/irongatevar.h>
74:
75: #include <dev/isa/isareg.h>
76: #include <dev/isa/isavar.h>
77:
78: #include "isadma.h"
79:
80: bus_dma_tag_t irongate_dma_get_tag(bus_dma_tag_t, alpha_bus_t);
81:
82: void
83: irongate_dma_init(struct irongate_config *icp)
84: {
85: bus_dma_tag_t t;
86:
87: /*
88: * Initialize the DMA tag used for PCI DMA.
89: */
90: t = &icp->ic_dmat_pci;
91: t->_cookie = icp;
92: t->_wbase = 0;
93: t->_wsize = 0x100000000UL;
94: t->_next_window = NULL;
95: t->_boundary = 0;
96: t->_sgmap = NULL;
97: t->_get_tag = irongate_dma_get_tag;
98: t->_dmamap_create = _bus_dmamap_create;
99: t->_dmamap_destroy = _bus_dmamap_destroy;
100: t->_dmamap_load = _bus_dmamap_load_direct;
101: t->_dmamap_load_mbuf = _bus_dmamap_load_mbuf_direct;
102: t->_dmamap_load_uio = _bus_dmamap_load_uio_direct;
103: t->_dmamap_load_raw = _bus_dmamap_load_raw_direct;
104: t->_dmamap_unload = _bus_dmamap_unload;
105: t->_dmamap_sync = _bus_dmamap_sync;
106:
107: t->_dmamem_alloc = _bus_dmamem_alloc;
108: t->_dmamem_free = _bus_dmamem_free;
109: t->_dmamem_map = _bus_dmamem_map;
110: t->_dmamem_unmap = _bus_dmamem_unmap;
111: t->_dmamem_mmap = _bus_dmamem_mmap;
112:
113: #if NISADMA > 0
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: #endif
140:
141: /* XXX XXX BEGIN XXX XXX */
142: { /* XXX */
143: extern paddr_t alpha_XXX_dmamap_or; /* XXX */
144: alpha_XXX_dmamap_or = 0; /* XXX */
145: } /* XXX */
146: /* XXX XXX END XXX XXX */
147: }
148:
149: /*
150: * Return the bus dma tag to be used for the specified bus type.
151: * INTERNAL USE ONLY!
152: */
153: bus_dma_tag_t
154: irongate_dma_get_tag(bus_dma_tag_t t, alpha_bus_t bustype)
155: {
156: struct irongate_config *icp = t->_cookie;
157:
158: switch (bustype) {
159: case ALPHA_BUS_PCI:
160: case ALPHA_BUS_EISA:
161: /*
162: * Busses capable of 32-bit DMA get the PCI DMA tag.
163: */
164: return (&icp->ic_dmat_pci);
165:
166: case ALPHA_BUS_ISA:
167: /*
168: * Lame 24-bit busses have to bounce.
169: */
170: return (&icp->ic_dmat_isa);
171:
172: default:
173: panic("irongate_dma_get_tag: shouldn't be here, really...");
174: }
175: }
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