1 /*-
2 * Copyright (c) 1997, Stefan Esser <se@freebsd.org>
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 * notice unmodified, this list of conditions, and the following
10 * disclaimer.
11 * 2. Redistributions in binary form must reproduce the above copyright
12 * notice, this list of conditions and the following disclaimer in the
13 * documentation and/or other materials provided with the distribution.
14 *
15 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
16 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
17 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
18 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
19 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
20 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
21 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
22 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
23 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
24 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
25 */
26
27 #include <sys/cdefs.h>
28 __FBSDID("$FreeBSD$");
29
30 #include "opt_cpu.h"
31
32 #include <sys/param.h>
33 #include <sys/systm.h>
34 #include <sys/bus.h>
35 #include <sys/kernel.h>
36 #include <sys/malloc.h>
37 #include <sys/module.h>
38
39 #include <dev/pci/pcivar.h>
40 #include <dev/pci/pcireg.h>
41 #include <dev/pci/pcib_private.h>
42 #include <isa/isavar.h>
43 #include <machine/legacyvar.h>
44 #include <machine/pci_cfgreg.h>
45
46 #include "pcib_if.h"
47
48 int
49 legacy_pcib_maxslots(device_t dev)
50 {
51 return 31;
52 }
53
54 /* read configuration space register */
55
56 u_int32_t
57 legacy_pcib_read_config(device_t dev, int bus, int slot, int func,
58 int reg, int bytes)
59 {
60 return(pci_cfgregread(bus, slot, func, reg, bytes));
61 }
62
63 /* write configuration space register */
64
65 void
66 legacy_pcib_write_config(device_t dev, int bus, int slot, int func,
67 int reg, u_int32_t data, int bytes)
68 {
69 pci_cfgregwrite(bus, slot, func, reg, data, bytes);
70 }
71
72 /* route interrupt */
73
74 static int
75 legacy_pcib_route_interrupt(device_t pcib, device_t dev, int pin)
76 {
77
78 /* No routing possible */
79 return (PCI_INVALID_IRQ);
80 }
81
82 static const char *
83 legacy_pcib_is_host_bridge(int bus, int slot, int func,
84 uint32_t id, uint8_t class, uint8_t subclass,
85 uint8_t *busnum)
86 {
87 const char *s = NULL;
88
89 *busnum = 0;
90 if (class == PCIC_BRIDGE && subclass == PCIS_BRIDGE_HOST)
91 s = "Host to PCI bridge";
92 return s;
93 }
94
95 /*
96 * Scan the first pci bus for host-pci bridges and add pcib instances
97 * to the nexus for each bridge.
98 */
99 static void
100 legacy_pcib_identify(driver_t *driver, device_t parent)
101 {
102 int bus, slot, func;
103 u_int8_t hdrtype;
104 int found = 0;
105 int pcifunchigh;
106 int found824xx = 0;
107 int found_orion = 0;
108 device_t child;
109 devclass_t pci_devclass;
110
111 if (pci_cfgregopen() == 0)
112 return;
113 /*
114 * Check to see if we haven't already had a PCI bus added
115 * via some other means. If we have, bail since otherwise
116 * we're going to end up duplicating it.
117 */
118 if ((pci_devclass = devclass_find("pci")) &&
119 devclass_get_device(pci_devclass, 0))
120 return;
121
122
123 bus = 0;
124 retry:
125 for (slot = 0; slot <= PCI_SLOTMAX; slot++) {
126 func = 0;
127 hdrtype = legacy_pcib_read_config(0, bus, slot, func,
128 PCIR_HDRTYPE, 1);
129 /*
130 * When enumerating bus devices, the standard says that
131 * one should check the header type and ignore the slots whose
132 * header types that the software doesn't know about. We use
133 * this to filter out devices.
134 */
135 if ((hdrtype & PCIM_HDRTYPE) > PCI_MAXHDRTYPE)
136 continue;
137 if ((hdrtype & PCIM_MFDEV) &&
138 (!found_orion || hdrtype != 0xff))
139 pcifunchigh = PCI_FUNCMAX;
140 else
141 pcifunchigh = 0;
142 for (func = 0; func <= pcifunchigh; func++) {
143 /*
144 * Read the IDs and class from the device.
145 */
146 u_int32_t id;
147 u_int8_t class, subclass, busnum;
148 const char *s;
149 device_t *devs;
150 int ndevs, i;
151
152 id = legacy_pcib_read_config(0, bus, slot, func,
153 PCIR_DEVVENDOR, 4);
154 if (id == -1)
155 continue;
156 class = legacy_pcib_read_config(0, bus, slot, func,
157 PCIR_CLASS, 1);
158 subclass = legacy_pcib_read_config(0, bus, slot, func,
159 PCIR_SUBCLASS, 1);
160
161 s = legacy_pcib_is_host_bridge(bus, slot, func,
162 id, class, subclass,
163 &busnum);
164 if (s == NULL)
165 continue;
166
167 /*
168 * Check to see if the physical bus has already
169 * been seen. Eg: hybrid 32 and 64 bit host
170 * bridges to the same logical bus.
171 */
172 if (device_get_children(parent, &devs, &ndevs) == 0) {
173 for (i = 0; s != NULL && i < ndevs; i++) {
174 if (strcmp(device_get_name(devs[i]),
175 "pcib") != 0)
176 continue;
177 if (legacy_get_pcibus(devs[i]) == busnum)
178 s = NULL;
179 }
180 free(devs, M_TEMP);
181 }
182
183 if (s == NULL)
184 continue;
185 /*
186 * Add at priority 100 to make sure we
187 * go after any motherboard resources
188 */
189 child = BUS_ADD_CHILD(parent, 100,
190 "pcib", busnum);
191 device_set_desc(child, s);
192 legacy_set_pcibus(child, busnum);
193
194 found = 1;
195 if (id == 0x12258086)
196 found824xx = 1;
197 if (id == 0x84c48086)
198 found_orion = 1;
199 }
200 }
201 if (found824xx && bus == 0) {
202 bus++;
203 goto retry;
204 }
205
206 /*
207 * Make sure we add at least one bridge since some old
208 * hardware doesn't actually have a host-pci bridge device.
209 * Note that pci_cfgregopen() thinks we have PCI devices..
210 */
211 if (!found) {
212 if (bootverbose)
213 printf(
214 "legacy_pcib_identify: no bridge found, adding pcib0 anyway\n");
215 child = BUS_ADD_CHILD(parent, 100, "pcib", 0);
216 legacy_set_pcibus(child, 0);
217 }
218 }
219
220 static int
221 legacy_pcib_probe(device_t dev)
222 {
223
224 if (pci_cfgregopen() == 0)
225 return ENXIO;
226 return -100;
227 }
228
229 static int
230 legacy_pcib_attach(device_t dev)
231 {
232 int bus;
233
234 bus = pcib_get_bus(dev);
235 device_add_child(dev, "pci", bus);
236 return bus_generic_attach(dev);
237 }
238
239 int
240 legacy_pcib_read_ivar(device_t dev, device_t child, int which,
241 uintptr_t *result)
242 {
243
244 switch (which) {
245 case PCIB_IVAR_BUS:
246 *result = legacy_get_pcibus(dev);
247 return 0;
248 }
249 return ENOENT;
250 }
251
252 int
253 legacy_pcib_write_ivar(device_t dev, device_t child, int which,
254 uintptr_t value)
255 {
256
257 switch (which) {
258 case PCIB_IVAR_BUS:
259 legacy_set_pcibus(dev, value);
260 return 0;
261 }
262 return ENOENT;
263 }
264
265
266 static device_method_t legacy_pcib_methods[] = {
267 /* Device interface */
268 DEVMETHOD(device_identify, legacy_pcib_identify),
269 DEVMETHOD(device_probe, legacy_pcib_probe),
270 DEVMETHOD(device_attach, legacy_pcib_attach),
271 DEVMETHOD(device_shutdown, bus_generic_shutdown),
272 DEVMETHOD(device_suspend, bus_generic_suspend),
273 DEVMETHOD(device_resume, bus_generic_resume),
274
275 /* Bus interface */
276 DEVMETHOD(bus_print_child, bus_generic_print_child),
277 DEVMETHOD(bus_read_ivar, legacy_pcib_read_ivar),
278 DEVMETHOD(bus_write_ivar, legacy_pcib_write_ivar),
279 DEVMETHOD(bus_alloc_resource, bus_generic_alloc_resource),
280 DEVMETHOD(bus_release_resource, bus_generic_release_resource),
281 DEVMETHOD(bus_activate_resource, bus_generic_activate_resource),
282 DEVMETHOD(bus_deactivate_resource, bus_generic_deactivate_resource),
283 DEVMETHOD(bus_setup_intr, bus_generic_setup_intr),
284 DEVMETHOD(bus_teardown_intr, bus_generic_teardown_intr),
285
286 /* pcib interface */
287 DEVMETHOD(pcib_maxslots, legacy_pcib_maxslots),
288 DEVMETHOD(pcib_read_config, legacy_pcib_read_config),
289 DEVMETHOD(pcib_write_config, legacy_pcib_write_config),
290 DEVMETHOD(pcib_route_interrupt, legacy_pcib_route_interrupt),
291
292 { 0, 0 }
293 };
294
295 static driver_t legacy_pcib_driver = {
296 "pcib",
297 legacy_pcib_methods,
298 1,
299 };
300
301 DRIVER_MODULE(pcib, legacy, legacy_pcib_driver, pcib_devclass, 0, 0);
302
303
304 /*
305 * Provide a device to "eat" the host->pci bridges that we dug up above
306 * and stop them showing up twice on the probes. This also stops them
307 * showing up as 'none' in pciconf -l.
308 */
309 static int
310 pci_hostb_probe(device_t dev)
311 {
312 u_int32_t id;
313
314 id = pci_get_devid(dev);
315
316 switch (id) {
317
318 /* VIA VT82C596 Power Managment Function */
319 case 0x30501106:
320 return ENXIO;
321
322 default:
323 break;
324 }
325
326 if (pci_get_class(dev) == PCIC_BRIDGE &&
327 pci_get_subclass(dev) == PCIS_BRIDGE_HOST) {
328 device_set_desc(dev, "Host to PCI bridge");
329 device_quiet(dev);
330 return -10000;
331 }
332 return ENXIO;
333 }
334
335 static int
336 pci_hostb_attach(device_t dev)
337 {
338
339 return 0;
340 }
341
342 static device_method_t pci_hostb_methods[] = {
343 /* Device interface */
344 DEVMETHOD(device_probe, pci_hostb_probe),
345 DEVMETHOD(device_attach, pci_hostb_attach),
346 DEVMETHOD(device_shutdown, bus_generic_shutdown),
347 DEVMETHOD(device_suspend, bus_generic_suspend),
348 DEVMETHOD(device_resume, bus_generic_resume),
349
350 { 0, 0 }
351 };
352 static driver_t pci_hostb_driver = {
353 "hostb",
354 pci_hostb_methods,
355 1,
356 };
357 static devclass_t pci_hostb_devclass;
358
359 DRIVER_MODULE(hostb, pci, pci_hostb_driver, pci_hostb_devclass, 0, 0);
360
361
362 /*
363 * Install placeholder to claim the resources owned by the
364 * PCI bus interface. This could be used to extract the
365 * config space registers in the extreme case where the PnP
366 * ID is available and the PCI BIOS isn't, but for now we just
367 * eat the PnP ID and do nothing else.
368 *
369 * XXX we should silence this probe, as it will generally confuse
370 * people.
371 */
372 static struct isa_pnp_id pcibus_pnp_ids[] = {
373 { 0x030ad041 /* PNP0A03 */, "PCI Bus" },
374 { 0 }
375 };
376
377 static int
378 pcibus_pnp_probe(device_t dev)
379 {
380 int result;
381
382 if ((result = ISA_PNP_PROBE(device_get_parent(dev), dev, pcibus_pnp_ids)) <= 0)
383 device_quiet(dev);
384 return(result);
385 }
386
387 static int
388 pcibus_pnp_attach(device_t dev)
389 {
390 return(0);
391 }
392
393 static device_method_t pcibus_pnp_methods[] = {
394 /* Device interface */
395 DEVMETHOD(device_probe, pcibus_pnp_probe),
396 DEVMETHOD(device_attach, pcibus_pnp_attach),
397 DEVMETHOD(device_detach, bus_generic_detach),
398 DEVMETHOD(device_shutdown, bus_generic_shutdown),
399 DEVMETHOD(device_suspend, bus_generic_suspend),
400 DEVMETHOD(device_resume, bus_generic_resume),
401 { 0, 0 }
402 };
403
404 static driver_t pcibus_pnp_driver = {
405 "pcibus_pnp",
406 pcibus_pnp_methods,
407 1, /* no softc */
408 };
409
410 static devclass_t pcibus_pnp_devclass;
411
412 DRIVER_MODULE(pcibus_pnp, isa, pcibus_pnp_driver, pcibus_pnp_devclass, 0, 0);
Cache object: 806448698ef75e520c0f601e1720b201
|