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: releng/9.2/sys/amd64/amd64/legacy.c 234150 2012-04-11 20:50:17Z jhb $");
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 <machine/clock.h>
51 #include <machine/legacyvar.h>
52 #include <machine/resource.h>
53
54 static MALLOC_DEFINE(M_LEGACYDEV, "legacydrv", "legacy system device");
55 struct legacy_device {
56 int lg_pcibus;
57 int lg_pcislot;
58 int lg_pcifunc;
59 };
60
61 #define DEVTOAT(dev) ((struct legacy_device *)device_get_ivars(dev))
62
63 static int legacy_probe(device_t);
64 static int legacy_attach(device_t);
65 static int legacy_print_child(device_t, device_t);
66 static device_t legacy_add_child(device_t bus, u_int order, const char *name,
67 int unit);
68 static int legacy_read_ivar(device_t, device_t, int, uintptr_t *);
69 static int legacy_write_ivar(device_t, device_t, int, uintptr_t);
70
71 static device_method_t legacy_methods[] = {
72 /* Device interface */
73 DEVMETHOD(device_probe, legacy_probe),
74 DEVMETHOD(device_attach, legacy_attach),
75 DEVMETHOD(device_detach, bus_generic_detach),
76 DEVMETHOD(device_shutdown, bus_generic_shutdown),
77 DEVMETHOD(device_suspend, bus_generic_suspend),
78 DEVMETHOD(device_resume, bus_generic_resume),
79
80 /* Bus interface */
81 DEVMETHOD(bus_print_child, legacy_print_child),
82 DEVMETHOD(bus_add_child, legacy_add_child),
83 DEVMETHOD(bus_read_ivar, legacy_read_ivar),
84 DEVMETHOD(bus_write_ivar, legacy_write_ivar),
85 DEVMETHOD(bus_alloc_resource, bus_generic_alloc_resource),
86 DEVMETHOD(bus_adjust_resource, bus_generic_adjust_resource),
87 DEVMETHOD(bus_release_resource, bus_generic_release_resource),
88 DEVMETHOD(bus_activate_resource, bus_generic_activate_resource),
89 DEVMETHOD(bus_deactivate_resource, bus_generic_deactivate_resource),
90 DEVMETHOD(bus_setup_intr, bus_generic_setup_intr),
91 DEVMETHOD(bus_teardown_intr, bus_generic_teardown_intr),
92
93 { 0, 0 }
94 };
95
96 static driver_t legacy_driver = {
97 "legacy",
98 legacy_methods,
99 1, /* no softc */
100 };
101 static devclass_t legacy_devclass;
102
103 DRIVER_MODULE(legacy, nexus, legacy_driver, legacy_devclass, 0, 0);
104
105 static int
106 legacy_probe(device_t dev)
107 {
108
109 device_set_desc(dev, "legacy system");
110 device_quiet(dev);
111 return (0);
112 }
113
114 static int
115 legacy_attach(device_t dev)
116 {
117 device_t child;
118
119 /*
120 * Let our child drivers identify any child devices that they
121 * can find. Once that is done attach any devices that we
122 * found.
123 */
124 bus_generic_probe(dev);
125 bus_generic_attach(dev);
126
127 /*
128 * If we didn't see ISA on a pci bridge, create some
129 * connection points now so it shows up "on motherboard".
130 */
131 if (!devclass_get_device(devclass_find("isa"), 0)) {
132 child = BUS_ADD_CHILD(dev, 0, "isa", 0);
133 if (child == NULL)
134 panic("legacy_attach isa");
135 device_probe_and_attach(child);
136 }
137
138 return 0;
139 }
140
141 static int
142 legacy_print_child(device_t bus, device_t child)
143 {
144 struct legacy_device *atdev = DEVTOAT(child);
145 int retval = 0;
146
147 retval += bus_print_child_header(bus, child);
148 if (atdev->lg_pcibus != -1)
149 retval += printf(" pcibus %d", atdev->lg_pcibus);
150 retval += printf(" on motherboard\n"); /* XXX "motherboard", ick */
151
152 return (retval);
153 }
154
155 static device_t
156 legacy_add_child(device_t bus, u_int order, const char *name, int unit)
157 {
158 device_t child;
159 struct legacy_device *atdev;
160
161 atdev = malloc(sizeof(struct legacy_device), M_LEGACYDEV,
162 M_NOWAIT | M_ZERO);
163 if (atdev == NULL)
164 return(NULL);
165 atdev->lg_pcibus = -1;
166 atdev->lg_pcislot = -1;
167 atdev->lg_pcifunc = -1;
168
169 child = device_add_child_ordered(bus, order, name, unit);
170 if (child == NULL)
171 free(atdev, M_LEGACYDEV);
172 else
173 /* should we free this in legacy_child_detached? */
174 device_set_ivars(child, atdev);
175
176 return (child);
177 }
178
179 static int
180 legacy_read_ivar(device_t dev, device_t child, int which, uintptr_t *result)
181 {
182 struct legacy_device *atdev = DEVTOAT(child);
183
184 switch (which) {
185 case LEGACY_IVAR_PCIDOMAIN:
186 *result = 0;
187 break;
188 case LEGACY_IVAR_PCIBUS:
189 *result = atdev->lg_pcibus;
190 break;
191 case LEGACY_IVAR_PCISLOT:
192 *result = atdev->lg_pcislot;
193 break;
194 case LEGACY_IVAR_PCIFUNC:
195 *result = atdev->lg_pcifunc;
196 break;
197 default:
198 return ENOENT;
199 }
200 return 0;
201 }
202
203
204 static int
205 legacy_write_ivar(device_t dev, device_t child, int which, uintptr_t value)
206 {
207 struct legacy_device *atdev = DEVTOAT(child);
208
209 switch (which) {
210 case LEGACY_IVAR_PCIDOMAIN:
211 return EINVAL;
212 case LEGACY_IVAR_PCIBUS:
213 atdev->lg_pcibus = value;
214 break;
215 case LEGACY_IVAR_PCISLOT:
216 atdev->lg_pcislot = value;
217 break;
218 case LEGACY_IVAR_PCIFUNC:
219 atdev->lg_pcifunc = value;
220 break;
221 default:
222 return ENOENT;
223 }
224 return 0;
225 }
226
227 /*
228 * Legacy CPU attachment when ACPI is not available. Drivers like
229 * cpufreq(4) hang off this.
230 */
231 static void cpu_identify(driver_t *driver, device_t parent);
232 static int cpu_read_ivar(device_t dev, device_t child, int index,
233 uintptr_t *result);
234 static device_t cpu_add_child(device_t bus, u_int order, const char *name,
235 int unit);
236 static struct resource_list *cpu_get_rlist(device_t dev, device_t child);
237
238 struct cpu_device {
239 struct resource_list cd_rl;
240 struct pcpu *cd_pcpu;
241 };
242
243 static device_method_t cpu_methods[] = {
244 /* Device interface */
245 DEVMETHOD(device_identify, cpu_identify),
246 DEVMETHOD(device_probe, bus_generic_probe),
247 DEVMETHOD(device_attach, bus_generic_attach),
248 DEVMETHOD(device_detach, bus_generic_detach),
249 DEVMETHOD(device_shutdown, bus_generic_shutdown),
250 DEVMETHOD(device_suspend, bus_generic_suspend),
251 DEVMETHOD(device_resume, bus_generic_resume),
252
253 /* Bus interface */
254 DEVMETHOD(bus_add_child, cpu_add_child),
255 DEVMETHOD(bus_read_ivar, cpu_read_ivar),
256 DEVMETHOD(bus_get_resource_list, cpu_get_rlist),
257 DEVMETHOD(bus_get_resource, bus_generic_rl_get_resource),
258 DEVMETHOD(bus_set_resource, bus_generic_rl_set_resource),
259 DEVMETHOD(bus_alloc_resource, bus_generic_rl_alloc_resource),
260 DEVMETHOD(bus_release_resource, bus_generic_rl_release_resource),
261 DEVMETHOD(bus_activate_resource, bus_generic_activate_resource),
262 DEVMETHOD(bus_deactivate_resource, bus_generic_deactivate_resource),
263 DEVMETHOD(bus_setup_intr, bus_generic_setup_intr),
264 DEVMETHOD(bus_teardown_intr, bus_generic_teardown_intr),
265
266 DEVMETHOD_END
267 };
268
269 static driver_t cpu_driver = {
270 "cpu",
271 cpu_methods,
272 1, /* no softc */
273 };
274 static devclass_t cpu_devclass;
275 DRIVER_MODULE(cpu, legacy, cpu_driver, cpu_devclass, 0, 0);
276
277 static void
278 cpu_identify(driver_t *driver, device_t parent)
279 {
280 device_t child;
281 int i;
282
283 /*
284 * Attach a cpuX device for each CPU. We use an order of 150
285 * so that these devices are attached after the Host-PCI
286 * bridges (which are added at order 100).
287 */
288 CPU_FOREACH(i) {
289 child = BUS_ADD_CHILD(parent, 150, "cpu", i);
290 if (child == NULL)
291 panic("legacy_attach cpu");
292 }
293 }
294
295 static device_t
296 cpu_add_child(device_t bus, u_int order, const char *name, int unit)
297 {
298 struct cpu_device *cd;
299 device_t child;
300 struct pcpu *pc;
301
302 if ((cd = malloc(sizeof(*cd), M_DEVBUF, M_NOWAIT | M_ZERO)) == NULL)
303 return (NULL);
304
305 resource_list_init(&cd->cd_rl);
306 pc = pcpu_find(device_get_unit(bus));
307 cd->cd_pcpu = pc;
308
309 child = device_add_child_ordered(bus, order, name, unit);
310 if (child != NULL) {
311 pc->pc_device = child;
312 device_set_ivars(child, cd);
313 } else
314 free(cd, M_DEVBUF);
315 return (child);
316 }
317
318 static struct resource_list *
319 cpu_get_rlist(device_t dev, device_t child)
320 {
321 struct cpu_device *cpdev;
322
323 cpdev = device_get_ivars(child);
324 return (&cpdev->cd_rl);
325 }
326
327 static int
328 cpu_read_ivar(device_t dev, device_t child, int index, uintptr_t *result)
329 {
330 struct cpu_device *cpdev;
331
332 switch (index) {
333 case CPU_IVAR_PCPU:
334 cpdev = device_get_ivars(child);
335 *result = (uintptr_t)cpdev->cd_pcpu;
336 break;
337 case CPU_IVAR_NOMINAL_MHZ:
338 if (tsc_is_invariant) {
339 *result = (uintptr_t)(atomic_load_acq_64(&tsc_freq) /
340 1000000);
341 break;
342 }
343 /* FALLTHROUGH */
344 default:
345 return (ENOENT);
346 }
347 return (0);
348 }
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