FreeBSD/Linux Kernel Cross Reference
sys/i386/i386/legacy.c
1 /*-
2 * Copyright 1998 Massachusetts Institute of Technology
3 *
4 * Permission to use, copy, modify, and distribute this software and
5 * its documentation for any purpose and without fee is hereby
6 * granted, provided that both the above copyright notice and this
7 * permission notice appear in all copies, that both the above
8 * copyright notice and this permission notice appear in all
9 * supporting documentation, and that the name of M.I.T. not be used
10 * in advertising or publicity pertaining to distribution of the
11 * software without specific, written prior permission. M.I.T. makes
12 * no representations about the suitability of this software for any
13 * purpose. It is provided "as is" without express or implied
14 * warranty.
15 *
16 * THIS SOFTWARE IS PROVIDED BY M.I.T. ``AS IS''. M.I.T. DISCLAIMS
17 * ALL EXPRESS OR IMPLIED WARRANTIES WITH REGARD TO THIS SOFTWARE,
18 * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
19 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. IN NO EVENT
20 * SHALL M.I.T. BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
21 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
22 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
23 * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
24 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
25 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
26 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
27 * SUCH DAMAGE.
28 */
29
30 #include <sys/cdefs.h>
31 __FBSDID("$FreeBSD: src/sys/i386/i386/legacy.c,v 1.56.2.1 2005/02/25 21:44:13 njl Exp $");
32
33 /*
34 * This code implements a system driver for legacy systems that do not
35 * support ACPI or when ACPI support is not present in the kernel.
36 */
37
38 #include <sys/param.h>
39 #include <sys/systm.h>
40 #include <sys/bus.h>
41 #include <sys/cpu.h>
42 #include <sys/kernel.h>
43 #include <sys/malloc.h>
44 #include <sys/module.h>
45 #include <machine/bus.h>
46 #include <sys/pcpu.h>
47 #include <sys/rman.h>
48 #include <sys/smp.h>
49
50 #include "opt_mca.h"
51 #ifdef DEV_MCA
52 #include <i386/bios/mca_machdep.h>
53 #endif
54
55 #include <machine/legacyvar.h>
56 #include <machine/resource.h>
57
58 static MALLOC_DEFINE(M_LEGACYDEV, "legacydrv", "legacy system device");
59 struct legacy_device {
60 int lg_pcibus;
61 };
62
63 #define DEVTOAT(dev) ((struct legacy_device *)device_get_ivars(dev))
64
65 static void legacy_identify(driver_t *driver, device_t parent);
66 static int legacy_probe(device_t);
67 static int legacy_attach(device_t);
68 static int legacy_print_child(device_t, device_t);
69 static device_t legacy_add_child(device_t bus, int order, const char *name,
70 int unit);
71 static int legacy_read_ivar(device_t, device_t, int, uintptr_t *);
72 static int legacy_write_ivar(device_t, device_t, int, uintptr_t);
73
74 static device_method_t legacy_methods[] = {
75 /* Device interface */
76 DEVMETHOD(device_identify, legacy_identify),
77 DEVMETHOD(device_probe, legacy_probe),
78 DEVMETHOD(device_attach, legacy_attach),
79 DEVMETHOD(device_detach, bus_generic_detach),
80 DEVMETHOD(device_shutdown, bus_generic_shutdown),
81 DEVMETHOD(device_suspend, bus_generic_suspend),
82 DEVMETHOD(device_resume, bus_generic_resume),
83
84 /* Bus interface */
85 DEVMETHOD(bus_print_child, legacy_print_child),
86 DEVMETHOD(bus_add_child, legacy_add_child),
87 DEVMETHOD(bus_read_ivar, legacy_read_ivar),
88 DEVMETHOD(bus_write_ivar, legacy_write_ivar),
89 DEVMETHOD(bus_alloc_resource, bus_generic_alloc_resource),
90 DEVMETHOD(bus_release_resource, bus_generic_release_resource),
91 DEVMETHOD(bus_activate_resource, bus_generic_activate_resource),
92 DEVMETHOD(bus_deactivate_resource, bus_generic_deactivate_resource),
93 DEVMETHOD(bus_setup_intr, bus_generic_setup_intr),
94 DEVMETHOD(bus_teardown_intr, bus_generic_teardown_intr),
95
96 { 0, 0 }
97 };
98
99 static driver_t legacy_driver = {
100 "legacy",
101 legacy_methods,
102 1, /* no softc */
103 };
104 static devclass_t legacy_devclass;
105
106 DRIVER_MODULE(legacy, nexus, legacy_driver, legacy_devclass, 0, 0);
107
108 static void
109 legacy_identify(driver_t *driver, device_t parent)
110 {
111
112 /*
113 * Add child device with order of 1 so it gets probed
114 * after ACPI (which is at order 0.
115 */
116 if (BUS_ADD_CHILD(parent, 1, "legacy", 0) == NULL)
117 panic("legacy: could not attach");
118 }
119
120 static int
121 legacy_probe(device_t dev)
122 {
123 device_t acpi;
124
125 /*
126 * Fail to probe if ACPI is ok.
127 */
128 acpi = devclass_get_device(devclass_find("acpi"), 0);
129 if (acpi != NULL && device_is_alive(acpi))
130 return (ENXIO);
131 device_set_desc(dev, "legacy system");
132 device_quiet(dev);
133 return (0);
134 }
135
136 static int
137 legacy_attach(device_t dev)
138 {
139 device_t child;
140 int i;
141
142 /* First, attach the CPU pseudo-driver. */
143 for (i = 0; i <= mp_maxid; i++)
144 if (!CPU_ABSENT(i)) {
145 child = BUS_ADD_CHILD(dev, 0, "cpu", i);
146 if (child == NULL)
147 panic("legacy_attach cpu");
148 device_probe_and_attach(child);
149 }
150
151 /*
152 * Second, let our child driver's identify any child devices that
153 * they can find. Once that is done attach any devices that we
154 * found.
155 */
156 bus_generic_probe(dev);
157 bus_generic_attach(dev);
158
159 #ifndef PC98
160 /*
161 * If we didn't see EISA or ISA on a pci bridge, create some
162 * connection points now so they show up "on motherboard".
163 */
164 if (!devclass_get_device(devclass_find("eisa"), 0)) {
165 child = BUS_ADD_CHILD(dev, 0, "eisa", 0);
166 if (child == NULL)
167 panic("legacy_attach eisa");
168 device_probe_and_attach(child);
169 }
170 #endif
171 #ifdef DEV_MCA
172 if (MCA_system && !devclass_get_device(devclass_find("mca"), 0)) {
173 child = BUS_ADD_CHILD(dev, 0, "mca", 0);
174 if (child == 0)
175 panic("legacy_probe mca");
176 device_probe_and_attach(child);
177 }
178 #endif
179 if (!devclass_get_device(devclass_find("isa"), 0)) {
180 child = BUS_ADD_CHILD(dev, 0, "isa", 0);
181 if (child == NULL)
182 panic("legacy_attach isa");
183 device_probe_and_attach(child);
184 }
185
186 return 0;
187 }
188
189 static int
190 legacy_print_child(device_t bus, device_t child)
191 {
192 struct legacy_device *atdev = DEVTOAT(child);
193 int retval = 0;
194
195 retval += bus_print_child_header(bus, child);
196 if (atdev->lg_pcibus != -1)
197 retval += printf(" pcibus %d", atdev->lg_pcibus);
198 retval += printf(" on motherboard\n"); /* XXX "motherboard", ick */
199
200 return (retval);
201 }
202
203 static device_t
204 legacy_add_child(device_t bus, int order, const char *name, int unit)
205 {
206 device_t child;
207 struct legacy_device *atdev;
208
209 atdev = malloc(sizeof(struct legacy_device), M_LEGACYDEV,
210 M_NOWAIT | M_ZERO);
211 if (atdev == NULL)
212 return(NULL);
213 atdev->lg_pcibus = -1;
214
215 child = device_add_child_ordered(bus, order, name, unit);
216 if (child == NULL)
217 free(atdev, M_LEGACYDEV);
218 else
219 /* should we free this in legacy_child_detached? */
220 device_set_ivars(child, atdev);
221
222 return (child);
223 }
224
225 static int
226 legacy_read_ivar(device_t dev, device_t child, int which, uintptr_t *result)
227 {
228 struct legacy_device *atdev = DEVTOAT(child);
229
230 switch (which) {
231 case LEGACY_IVAR_PCIBUS:
232 *result = atdev->lg_pcibus;
233 break;
234 default:
235 return ENOENT;
236 }
237 return 0;
238 }
239
240
241 static int
242 legacy_write_ivar(device_t dev, device_t child, int which, uintptr_t value)
243 {
244 struct legacy_device *atdev = DEVTOAT(child);
245
246 switch (which) {
247 case LEGACY_IVAR_PCIBUS:
248 atdev->lg_pcibus = value;
249 break;
250 default:
251 return ENOENT;
252 }
253 return 0;
254 }
255
256 /*
257 * Legacy CPU attachment when ACPI is not available. Drivers like
258 * cpufreq(4) hang off this.
259 */
260 static int cpu_read_ivar(device_t dev, device_t child, int index,
261 uintptr_t *result);
262 static device_t cpu_add_child(device_t bus, int order, const char *name,
263 int unit);
264 static struct resource_list *cpu_get_rlist(device_t dev, device_t child);
265
266 struct cpu_device {
267 struct resource_list cd_rl;
268 struct pcpu *cd_pcpu;
269 };
270
271 static device_method_t cpu_methods[] = {
272 /* Device interface */
273 DEVMETHOD(device_probe, bus_generic_probe),
274 DEVMETHOD(device_attach, bus_generic_attach),
275 DEVMETHOD(device_detach, bus_generic_detach),
276 DEVMETHOD(device_shutdown, bus_generic_shutdown),
277 DEVMETHOD(device_suspend, bus_generic_suspend),
278 DEVMETHOD(device_resume, bus_generic_resume),
279
280 /* Bus interface */
281 DEVMETHOD(bus_add_child, cpu_add_child),
282 DEVMETHOD(bus_read_ivar, cpu_read_ivar),
283 DEVMETHOD(bus_print_child, bus_generic_print_child),
284 DEVMETHOD(bus_get_resource_list, cpu_get_rlist),
285 DEVMETHOD(bus_get_resource, bus_generic_rl_get_resource),
286 DEVMETHOD(bus_set_resource, bus_generic_rl_set_resource),
287 DEVMETHOD(bus_alloc_resource, bus_generic_rl_alloc_resource),
288 DEVMETHOD(bus_release_resource, bus_generic_rl_release_resource),
289 DEVMETHOD(bus_driver_added, bus_generic_driver_added),
290 DEVMETHOD(bus_activate_resource, bus_generic_activate_resource),
291 DEVMETHOD(bus_deactivate_resource, bus_generic_deactivate_resource),
292 DEVMETHOD(bus_setup_intr, bus_generic_setup_intr),
293 DEVMETHOD(bus_teardown_intr, bus_generic_teardown_intr),
294
295 { 0, 0 }
296 };
297
298 static driver_t cpu_driver = {
299 "cpu",
300 cpu_methods,
301 1, /* no softc */
302 };
303 static devclass_t cpu_devclass;
304 DRIVER_MODULE(cpu, legacy, cpu_driver, cpu_devclass, 0, 0);
305
306 static device_t
307 cpu_add_child(device_t bus, int order, const char *name, int unit)
308 {
309 struct cpu_device *cd;
310 device_t child;
311 struct pcpu *pc;
312
313 if ((cd = malloc(sizeof(*cd), M_DEVBUF, M_NOWAIT | M_ZERO)) == NULL)
314 return (NULL);
315
316 resource_list_init(&cd->cd_rl);
317 pc = pcpu_find(device_get_unit(bus));
318 cd->cd_pcpu = pc;
319
320 child = device_add_child_ordered(bus, order, name, unit);
321 if (child != NULL) {
322 pc->pc_device = child;
323 device_set_ivars(child, cd);
324 } else
325 free(cd, M_DEVBUF);
326 return (child);
327 }
328
329 static struct resource_list *
330 cpu_get_rlist(device_t dev, device_t child)
331 {
332 struct cpu_device *cpdev;
333
334 cpdev = device_get_ivars(child);
335 return (&cpdev->cd_rl);
336 }
337
338 static int
339 cpu_read_ivar(device_t dev, device_t child, int index, uintptr_t *result)
340 {
341 struct cpu_device *cpdev;
342
343 if (index != CPU_IVAR_PCPU)
344 return (ENOENT);
345 cpdev = device_get_ivars(child);
346 *result = (uintptr_t)cpdev->cd_pcpu;
347 return (0);
348 }
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