1 /* $NetBSD: mbmem.c,v 1.22 2021/08/07 16:19:06 thorpej Exp $ */
2
3 /*-
4 * Copyright (c) 1996 The NetBSD Foundation, Inc.
5 * All rights reserved.
6 *
7 * This code is derived from software contributed to The NetBSD Foundation
8 * by Adam Glass, Gordon W. Ross, and Matthew Fredette.
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 #include <sys/cdefs.h>
33 __KERNEL_RCSID(0, "$NetBSD: mbmem.c,v 1.22 2021/08/07 16:19:06 thorpej Exp $");
34
35 #include <sys/param.h>
36 #include <sys/systm.h>
37 #include <sys/device.h>
38
39 #include <uvm/uvm_extern.h>
40
41 #define _SUN68K_BUS_DMA_PRIVATE
42 #include <machine/autoconf.h>
43 #include <machine/pmap.h>
44 #include <machine/dvma.h>
45
46 #include <sun2/sun2/control.h>
47 #include <sun2/sun2/machdep.h>
48 #include <sun2/sun2/mbmem.h>
49
50 /* Does this machine have a Multibus? */
51 extern int cpu_has_multibus;
52
53 static int mbmem_match(device_t, cfdata_t, void *);
54 static void mbmem_attach(device_t, device_t, void *);
55
56 struct mbmem_softc {
57 device_t sc_dev; /* base device */
58 bus_space_tag_t sc_bustag; /* parent bus tag */
59 bus_dma_tag_t sc_dmatag; /* parent bus dma tag */
60 };
61
62 CFATTACH_DECL_NEW(mbmem, sizeof(struct mbmem_softc),
63 mbmem_match, mbmem_attach, NULL, NULL);
64
65 static int mbmem_attached;
66
67 static paddr_t mbmem_bus_mmap(bus_space_tag_t, bus_type_t, bus_addr_t, off_t,
68 int, int);
69 static int _mbmem_bus_map(bus_space_tag_t, bus_type_t, bus_addr_t, bus_size_t,
70 int, vaddr_t, bus_space_handle_t *);
71 static int mbmem_dmamap_load(bus_dma_tag_t, bus_dmamap_t, void *, bus_size_t,
72 struct proc *, int);
73 static int mbmem_dmamap_load_raw(bus_dma_tag_t, bus_dmamap_t,
74 bus_dma_segment_t *, int, bus_size_t, int);
75
76 static struct sun68k_bus_space_tag mbmem_space_tag = {
77 NULL, /* cookie */
78 NULL, /* parent bus tag */
79 _mbmem_bus_map, /* bus_space_map */
80 NULL, /* bus_space_unmap */
81 NULL, /* bus_space_subregion */
82 NULL, /* bus_space_barrier */
83 mbmem_bus_mmap, /* bus_space_mmap */
84 NULL, /* bus_intr_establish */
85 NULL, /* bus_space_peek_N */
86 NULL /* bus_space_poke_N */
87 };
88
89 static struct sun68k_bus_dma_tag mbmem_dma_tag;
90
91 static int
mbmem_match(device_t parent,cfdata_t cf,void * aux)92 mbmem_match(device_t parent, cfdata_t cf, void *aux)
93 {
94 struct mainbus_attach_args *ma = aux;
95
96 if (mbmem_attached)
97 return 0;
98
99 return cpu_has_multibus &&
100 (ma->ma_name == NULL || strcmp(cf->cf_name, ma->ma_name) == 0);
101 }
102
103 static void
mbmem_attach(device_t parent,device_t self,void * aux)104 mbmem_attach(device_t parent, device_t self, void *aux)
105 {
106 struct mainbus_attach_args *ma = aux;
107 struct mbmem_softc *sc = device_private(self);
108 struct mbmem_attach_args mbma;
109 const char *const *cpp;
110 static const char *const special[] = {
111 /* find these first */
112 NULL
113 };
114
115 mbmem_attached = 1;
116
117 sc->sc_dev = self;
118 aprint_normal("\n");
119
120 sc->sc_bustag = ma->ma_bustag;
121 sc->sc_dmatag = ma->ma_dmatag;
122
123 mbmem_space_tag.cookie = sc;
124 mbmem_space_tag.parent = sc->sc_bustag;
125
126 mbmem_dma_tag = *sc->sc_dmatag;
127 mbmem_dma_tag._cookie = sc;
128 mbmem_dma_tag._dmamap_load = mbmem_dmamap_load;
129 mbmem_dma_tag._dmamap_load_raw = mbmem_dmamap_load_raw;
130
131 /*
132 * Prepare the skeleton attach arguments for our devices.
133 * The values we give in the locators are indications to
134 * sun68k_bus_search about which locators must and must not
135 * be defined.
136 */
137 mbma = *ma;
138 mbma.mbma_bustag = &mbmem_space_tag;
139 mbma.mbma_dmatag = &mbmem_dma_tag;
140 mbma.mbma_paddr = LOCATOR_REQUIRED;
141 mbma.mbma_pri = LOCATOR_OPTIONAL;
142
143 /* Find all `early' mbmem devices */
144 for (cpp = special; *cpp != NULL; cpp++) {
145 mbma.mbma_name = *cpp;
146 config_search(self, &mbma,
147 CFARGS(.search = sun68k_bus_search));
148 }
149
150 /* Find all other mbmem devices */
151 mbma.mbma_name = NULL;
152 config_search(self, &mbma,
153 CFARGS(.search = sun68k_bus_search));
154 }
155
156 int
_mbmem_bus_map(bus_space_tag_t t,bus_type_t btype,bus_addr_t paddr,bus_size_t size,int flags,vaddr_t vaddr,bus_space_handle_t * hp)157 _mbmem_bus_map(bus_space_tag_t t, bus_type_t btype, bus_addr_t paddr,
158 bus_size_t size, int flags, vaddr_t vaddr, bus_space_handle_t *hp)
159 {
160 struct mbmem_softc *sc = t->cookie;
161
162 if ((paddr + size) > MBMEM_SIZE)
163 panic("%s: out of range", __func__);
164
165 return bus_space_map2(sc->sc_bustag, PMAP_MBMEM, paddr,
166 size, flags, vaddr, hp);
167 }
168
169 paddr_t
mbmem_bus_mmap(bus_space_tag_t t,bus_type_t btype,bus_addr_t paddr,off_t off,int prot,int flags)170 mbmem_bus_mmap(bus_space_tag_t t, bus_type_t btype, bus_addr_t paddr, off_t off,
171 int prot, int flags)
172 {
173 struct mbmem_softc *sc = t->cookie;
174
175 return bus_space_mmap2(sc->sc_bustag, PMAP_MBMEM, paddr, off,
176 prot, flags);
177 }
178
179 static int
mbmem_dmamap_load(bus_dma_tag_t t,bus_dmamap_t map,void * buf,bus_size_t buflen,struct proc * p,int flags)180 mbmem_dmamap_load(bus_dma_tag_t t, bus_dmamap_t map, void *buf,
181 bus_size_t buflen, struct proc *p, int flags)
182 {
183 int error;
184
185 error = _bus_dmamap_load(t, map, buf, buflen, p, flags);
186 if (error == 0)
187 map->dm_segs[0].ds_addr &= DVMA_MBMEM_SLAVE_MASK;
188 return error;
189 }
190
191 static int
mbmem_dmamap_load_raw(bus_dma_tag_t t,bus_dmamap_t map,bus_dma_segment_t * segs,int nsegs,bus_size_t size,int flags)192 mbmem_dmamap_load_raw(bus_dma_tag_t t, bus_dmamap_t map,
193 bus_dma_segment_t *segs, int nsegs, bus_size_t size, int flags)
194 {
195 int error;
196
197 error = _bus_dmamap_load_raw(t, map, segs, nsegs, size, flags);
198 if (error == 0)
199 map->dm_segs[0].ds_addr &= DVMA_MBMEM_SLAVE_MASK;
200 return error;
201 }
202