FreeBSD/Linux Kernel Cross Reference
sys/sparc64/pci/apb.c
1 /*-
2 * Copyright (c) 1994,1995 Stefan Esser, Wolfgang StanglMeier
3 * Copyright (c) 2000 Michael Smith <msmith@freebsd.org>
4 * Copyright (c) 2000 BSDi
5 * Copyright (c) 2001, 2003 Thomas Moestl <tmm@FreeBSD.org>
6 * All rights reserved.
7 *
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
10 * are met:
11 * 1. Redistributions of source code must retain the above copyright
12 * notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 * notice, this list of conditions and the following disclaimer in the
15 * documentation and/or other materials provided with the distribution.
16 * 3. The name of the author may not be used to endorse or promote products
17 * derived from this software without specific prior written permission.
18 *
19 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
22 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
29 * SUCH DAMAGE.
30 *
31 * from: FreeBSD: src/sys/dev/pci/pci_pci.c,v 1.3 2000/12/13
32 *
33 * $FreeBSD$
34 */
35
36 /*
37 * Support for the Sun APB (Advanced PCI Bridge) PCI-PCI bridge.
38 * This bridge does not fully comply to the PCI bridge specification, and is
39 * therefore not supported by the generic driver.
40 * We can use some of the pcib methods anyway.
41 */
42
43 #include "opt_ofw_pci.h"
44
45 #include <sys/param.h>
46 #include <sys/systm.h>
47 #include <sys/kernel.h>
48 #include <sys/module.h>
49 #include <sys/bus.h>
50
51 #include <dev/ofw/ofw_bus.h>
52 #include <dev/ofw/openfirm.h>
53
54 #include <machine/bus.h>
55 #include <machine/ofw_bus.h>
56 #include <machine/resource.h>
57
58 #include <dev/pci/pcireg.h>
59 #include <dev/pci/pcivar.h>
60 #include <dev/pci/pcib_private.h>
61
62 #include "pcib_if.h"
63
64 #include <sparc64/pci/ofw_pci.h>
65 #include <sparc64/pci/ofw_pcib_subr.h>
66
67 /*
68 * Bridge-specific data.
69 */
70 struct apb_softc {
71 struct ofw_pcib_gen_softc sc_bsc;
72 u_int8_t sc_iomap;
73 u_int8_t sc_memmap;
74 };
75
76 static device_probe_t apb_probe;
77 static device_attach_t apb_attach;
78 static bus_alloc_resource_t apb_alloc_resource;
79
80 static device_method_t apb_methods[] = {
81 /* Device interface */
82 DEVMETHOD(device_probe, apb_probe),
83 DEVMETHOD(device_attach, apb_attach),
84 DEVMETHOD(device_shutdown, bus_generic_shutdown),
85 DEVMETHOD(device_suspend, bus_generic_suspend),
86 DEVMETHOD(device_resume, bus_generic_resume),
87
88 /* Bus interface */
89 DEVMETHOD(bus_print_child, bus_generic_print_child),
90 DEVMETHOD(bus_read_ivar, pcib_read_ivar),
91 DEVMETHOD(bus_write_ivar, pcib_write_ivar),
92 DEVMETHOD(bus_alloc_resource, apb_alloc_resource),
93 DEVMETHOD(bus_release_resource, bus_generic_release_resource),
94 DEVMETHOD(bus_activate_resource, bus_generic_activate_resource),
95 DEVMETHOD(bus_deactivate_resource, bus_generic_deactivate_resource),
96 DEVMETHOD(bus_setup_intr, bus_generic_setup_intr),
97 DEVMETHOD(bus_teardown_intr, bus_generic_teardown_intr),
98
99 /* pcib interface */
100 DEVMETHOD(pcib_maxslots, pcib_maxslots),
101 DEVMETHOD(pcib_read_config, pcib_read_config),
102 DEVMETHOD(pcib_write_config, pcib_write_config),
103 DEVMETHOD(pcib_route_interrupt, ofw_pcib_gen_route_interrupt),
104
105 /* ofw_bus interface */
106 DEVMETHOD(ofw_bus_get_node, ofw_pcib_gen_get_node),
107
108 /* ofw_pci interface */
109 DEVMETHOD(ofw_pci_adjust_busrange, ofw_pcib_gen_adjust_busrange),
110
111 { 0, 0 }
112 };
113
114 static driver_t apb_driver = {
115 "pcib",
116 apb_methods,
117 sizeof(struct apb_softc),
118 };
119
120 DRIVER_MODULE(apb, pci, apb_driver, pcib_devclass, 0, 0);
121
122 /* APB specific registers */
123 #define APBR_IOMAP 0xde
124 #define APBR_MEMMAP 0xdf
125
126 /* Definitions for the mapping registers */
127 #define APB_IO_SCALE 0x200000
128 #define APB_MEM_SCALE 0x20000000
129
130 /*
131 * Generic device interface
132 */
133 static int
134 apb_probe(device_t dev)
135 {
136
137 if (pci_get_vendor(dev) == 0x108e && /* Sun */
138 pci_get_device(dev) == 0x5000) { /* APB */
139 device_set_desc(dev, "APB PCI-PCI bridge");
140 return (0);
141 }
142 return (ENXIO);
143 }
144
145 static void
146 apb_map_print(u_int8_t map, u_long scale)
147 {
148 int i, first;
149
150 for (first = 1, i = 0; i < 8; i++) {
151 if ((map & (1 << i)) != 0) {
152 printf("%s0x%lx-0x%lx", first ? "" : ", ",
153 i * scale, (i + 1) * scale - 1);
154 first = 0;
155 }
156 }
157 }
158
159 static int
160 apb_map_checkrange(u_int8_t map, u_long scale, u_long start, u_long end)
161 {
162 int i, ei;
163
164 i = start / scale;
165 ei = end / scale;
166 if (i > 7 || ei > 7)
167 return (0);
168 for (; i <= ei; i++)
169 if ((map & (1 << i)) == 0)
170 return (0);
171 return (1);
172 }
173
174 static int
175 apb_attach(device_t dev)
176 {
177 struct apb_softc *sc;
178
179 sc = device_get_softc(dev);
180
181 /*
182 * Get current bridge configuration.
183 */
184 sc->sc_iomap = pci_read_config(dev, APBR_IOMAP, 1);
185 sc->sc_memmap = pci_read_config(dev, APBR_MEMMAP, 1);
186 ofw_pcib_gen_setup(dev);
187
188 if (bootverbose) {
189 device_printf(dev, " secondary bus %d\n",
190 sc->sc_bsc.ops_pcib_sc.secbus);
191 device_printf(dev, " subordinate bus %d\n",
192 sc->sc_bsc.ops_pcib_sc.subbus);
193 device_printf(dev, " I/O decode ");
194 apb_map_print(sc->sc_iomap, APB_IO_SCALE);
195 printf("\n");
196 device_printf(dev, " memory decode ");
197 apb_map_print(sc->sc_memmap, APB_MEM_SCALE);
198 printf("\n");
199 }
200
201 device_add_child(dev, "pci", sc->sc_bsc.ops_pcib_sc.secbus);
202 return (bus_generic_attach(dev));
203 }
204
205 /*
206 * We have to trap resource allocation requests and ensure that the bridge
207 * is set up to, or capable of handling them.
208 */
209 static struct resource *
210 apb_alloc_resource(device_t dev, device_t child, int type, int *rid,
211 u_long start, u_long end, u_long count, u_int flags)
212 {
213 struct apb_softc *sc;
214
215 sc = device_get_softc(dev);
216 /*
217 * If this is a "default" allocation against this rid, we can't work
218 * out where it's coming from (we should actually never see these) so
219 * we just have to punt.
220 */
221 if ((start == 0) && (end == ~0)) {
222 device_printf(dev, "can't decode default resource id %d for "
223 "%s%d, bypassing\n", *rid, device_get_name(child),
224 device_get_unit(child));
225 } else {
226 /*
227 * Fail the allocation for this range if it's not supported.
228 * XXX we should probably just fix up the bridge decode and
229 * soldier on.
230 */
231 switch (type) {
232 case SYS_RES_IOPORT:
233 if (!apb_map_checkrange(sc->sc_iomap, APB_IO_SCALE,
234 start, end)) {
235 device_printf(dev, "device %s%d requested "
236 "unsupported I/O range 0x%lx-0x%lx\n",
237 device_get_name(child),
238 device_get_unit(child), start, end);
239 return (NULL);
240 }
241 if (bootverbose)
242 device_printf(sc->sc_bsc.ops_pcib_sc.dev,
243 "device %s%d requested decoded I/O range "
244 "0x%lx-0x%lx\n", device_get_name(child),
245 device_get_unit(child), start, end);
246 break;
247
248 case SYS_RES_MEMORY:
249 if (!apb_map_checkrange(sc->sc_memmap, APB_MEM_SCALE,
250 start, end)) {
251 device_printf(dev, "device %s%d requested "
252 "unsupported memory range 0x%lx-0x%lx\n",
253 device_get_name(child),
254 device_get_unit(child), start, end);
255 return (NULL);
256 }
257 if (bootverbose)
258 device_printf(sc->sc_bsc.ops_pcib_sc.dev,
259 "device %s%d requested decoded memory "
260 "range 0x%lx-0x%lx\n",
261 device_get_name(child),
262 device_get_unit(child), start, end);
263 break;
264
265 default:
266 break;
267 }
268 }
269
270 /*
271 * Bridge is OK decoding this resource, so pass it up.
272 */
273 return (bus_generic_alloc_resource(dev, child, type, rid, start, end,
274 count, flags));
275 }
Cache object: 97d634a9be313ea4697e04565eed8303
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