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/9.0/sys/amd64/amd64/legacy.c 222929 2011-06-10 12:30:16Z 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 };
58
59 #define DEVTOAT(dev) ((struct legacy_device *)device_get_ivars(dev))
60
61 static int legacy_probe(device_t);
62 static int legacy_attach(device_t);
63 static int legacy_print_child(device_t, device_t);
64 static device_t legacy_add_child(device_t bus, u_int order, const char *name,
65 int unit);
66 static int legacy_read_ivar(device_t, device_t, int, uintptr_t *);
67 static int legacy_write_ivar(device_t, device_t, int, uintptr_t);
68
69 static device_method_t legacy_methods[] = {
70 /* Device interface */
71 DEVMETHOD(device_probe, legacy_probe),
72 DEVMETHOD(device_attach, legacy_attach),
73 DEVMETHOD(device_detach, bus_generic_detach),
74 DEVMETHOD(device_shutdown, bus_generic_shutdown),
75 DEVMETHOD(device_suspend, bus_generic_suspend),
76 DEVMETHOD(device_resume, bus_generic_resume),
77
78 /* Bus interface */
79 DEVMETHOD(bus_print_child, legacy_print_child),
80 DEVMETHOD(bus_add_child, legacy_add_child),
81 DEVMETHOD(bus_read_ivar, legacy_read_ivar),
82 DEVMETHOD(bus_write_ivar, legacy_write_ivar),
83 DEVMETHOD(bus_alloc_resource, bus_generic_alloc_resource),
84 DEVMETHOD(bus_adjust_resource, bus_generic_adjust_resource),
85 DEVMETHOD(bus_release_resource, bus_generic_release_resource),
86 DEVMETHOD(bus_activate_resource, bus_generic_activate_resource),
87 DEVMETHOD(bus_deactivate_resource, bus_generic_deactivate_resource),
88 DEVMETHOD(bus_setup_intr, bus_generic_setup_intr),
89 DEVMETHOD(bus_teardown_intr, bus_generic_teardown_intr),
90
91 { 0, 0 }
92 };
93
94 static driver_t legacy_driver = {
95 "legacy",
96 legacy_methods,
97 1, /* no softc */
98 };
99 static devclass_t legacy_devclass;
100
101 DRIVER_MODULE(legacy, nexus, legacy_driver, legacy_devclass, 0, 0);
102
103 static int
104 legacy_probe(device_t dev)
105 {
106
107 device_set_desc(dev, "legacy system");
108 device_quiet(dev);
109 return (0);
110 }
111
112 static int
113 legacy_attach(device_t dev)
114 {
115 device_t child;
116
117 /*
118 * Let our child drivers identify any child devices that they
119 * can find. Once that is done attach any devices that we
120 * found.
121 */
122 bus_generic_probe(dev);
123 bus_generic_attach(dev);
124
125 /*
126 * If we didn't see ISA on a pci bridge, create some
127 * connection points now so it shows up "on motherboard".
128 */
129 if (!devclass_get_device(devclass_find("isa"), 0)) {
130 child = BUS_ADD_CHILD(dev, 0, "isa", 0);
131 if (child == NULL)
132 panic("legacy_attach isa");
133 device_probe_and_attach(child);
134 }
135
136 return 0;
137 }
138
139 static int
140 legacy_print_child(device_t bus, device_t child)
141 {
142 struct legacy_device *atdev = DEVTOAT(child);
143 int retval = 0;
144
145 retval += bus_print_child_header(bus, child);
146 if (atdev->lg_pcibus != -1)
147 retval += printf(" pcibus %d", atdev->lg_pcibus);
148 retval += printf(" on motherboard\n"); /* XXX "motherboard", ick */
149
150 return (retval);
151 }
152
153 static device_t
154 legacy_add_child(device_t bus, u_int order, const char *name, int unit)
155 {
156 device_t child;
157 struct legacy_device *atdev;
158
159 atdev = malloc(sizeof(struct legacy_device), M_LEGACYDEV,
160 M_NOWAIT | M_ZERO);
161 if (atdev == NULL)
162 return(NULL);
163 atdev->lg_pcibus = -1;
164
165 child = device_add_child_ordered(bus, order, name, unit);
166 if (child == NULL)
167 free(atdev, M_LEGACYDEV);
168 else
169 /* should we free this in legacy_child_detached? */
170 device_set_ivars(child, atdev);
171
172 return (child);
173 }
174
175 static int
176 legacy_read_ivar(device_t dev, device_t child, int which, uintptr_t *result)
177 {
178 struct legacy_device *atdev = DEVTOAT(child);
179
180 switch (which) {
181 case LEGACY_IVAR_PCIDOMAIN:
182 *result = 0;
183 break;
184 case LEGACY_IVAR_PCIBUS:
185 *result = atdev->lg_pcibus;
186 break;
187 default:
188 return ENOENT;
189 }
190 return 0;
191 }
192
193
194 static int
195 legacy_write_ivar(device_t dev, device_t child, int which, uintptr_t value)
196 {
197 struct legacy_device *atdev = DEVTOAT(child);
198
199 switch (which) {
200 case LEGACY_IVAR_PCIDOMAIN:
201 return EINVAL;
202 case LEGACY_IVAR_PCIBUS:
203 atdev->lg_pcibus = value;
204 break;
205 default:
206 return ENOENT;
207 }
208 return 0;
209 }
210
211 /*
212 * Legacy CPU attachment when ACPI is not available. Drivers like
213 * cpufreq(4) hang off this.
214 */
215 static void cpu_identify(driver_t *driver, device_t parent);
216 static int cpu_read_ivar(device_t dev, device_t child, int index,
217 uintptr_t *result);
218 static device_t cpu_add_child(device_t bus, u_int order, const char *name,
219 int unit);
220 static struct resource_list *cpu_get_rlist(device_t dev, device_t child);
221
222 struct cpu_device {
223 struct resource_list cd_rl;
224 struct pcpu *cd_pcpu;
225 };
226
227 static device_method_t cpu_methods[] = {
228 /* Device interface */
229 DEVMETHOD(device_identify, cpu_identify),
230 DEVMETHOD(device_probe, bus_generic_probe),
231 DEVMETHOD(device_attach, bus_generic_attach),
232 DEVMETHOD(device_detach, bus_generic_detach),
233 DEVMETHOD(device_shutdown, bus_generic_shutdown),
234 DEVMETHOD(device_suspend, bus_generic_suspend),
235 DEVMETHOD(device_resume, bus_generic_resume),
236
237 /* Bus interface */
238 DEVMETHOD(bus_add_child, cpu_add_child),
239 DEVMETHOD(bus_read_ivar, cpu_read_ivar),
240 DEVMETHOD(bus_print_child, bus_generic_print_child),
241 DEVMETHOD(bus_get_resource_list, cpu_get_rlist),
242 DEVMETHOD(bus_get_resource, bus_generic_rl_get_resource),
243 DEVMETHOD(bus_set_resource, bus_generic_rl_set_resource),
244 DEVMETHOD(bus_alloc_resource, bus_generic_rl_alloc_resource),
245 DEVMETHOD(bus_release_resource, bus_generic_rl_release_resource),
246 DEVMETHOD(bus_driver_added, bus_generic_driver_added),
247 DEVMETHOD(bus_activate_resource, bus_generic_activate_resource),
248 DEVMETHOD(bus_deactivate_resource, bus_generic_deactivate_resource),
249 DEVMETHOD(bus_setup_intr, bus_generic_setup_intr),
250 DEVMETHOD(bus_teardown_intr, bus_generic_teardown_intr),
251
252 { 0, 0 }
253 };
254
255 static driver_t cpu_driver = {
256 "cpu",
257 cpu_methods,
258 1, /* no softc */
259 };
260 static devclass_t cpu_devclass;
261 DRIVER_MODULE(cpu, legacy, cpu_driver, cpu_devclass, 0, 0);
262
263 static void
264 cpu_identify(driver_t *driver, device_t parent)
265 {
266 device_t child;
267 int i;
268
269 /*
270 * Attach a cpuX device for each CPU. We use an order of 150
271 * so that these devices are attached after the Host-PCI
272 * bridges (which are added at order 100).
273 */
274 CPU_FOREACH(i) {
275 child = BUS_ADD_CHILD(parent, 150, "cpu", i);
276 if (child == NULL)
277 panic("legacy_attach cpu");
278 }
279 }
280
281 static device_t
282 cpu_add_child(device_t bus, u_int order, const char *name, int unit)
283 {
284 struct cpu_device *cd;
285 device_t child;
286 struct pcpu *pc;
287
288 if ((cd = malloc(sizeof(*cd), M_DEVBUF, M_NOWAIT | M_ZERO)) == NULL)
289 return (NULL);
290
291 resource_list_init(&cd->cd_rl);
292 pc = pcpu_find(device_get_unit(bus));
293 cd->cd_pcpu = pc;
294
295 child = device_add_child_ordered(bus, order, name, unit);
296 if (child != NULL) {
297 pc->pc_device = child;
298 device_set_ivars(child, cd);
299 } else
300 free(cd, M_DEVBUF);
301 return (child);
302 }
303
304 static struct resource_list *
305 cpu_get_rlist(device_t dev, device_t child)
306 {
307 struct cpu_device *cpdev;
308
309 cpdev = device_get_ivars(child);
310 return (&cpdev->cd_rl);
311 }
312
313 static int
314 cpu_read_ivar(device_t dev, device_t child, int index, uintptr_t *result)
315 {
316 struct cpu_device *cpdev;
317
318 switch (index) {
319 case CPU_IVAR_PCPU:
320 cpdev = device_get_ivars(child);
321 *result = (uintptr_t)cpdev->cd_pcpu;
322 break;
323 case CPU_IVAR_NOMINAL_MHZ:
324 if (tsc_is_invariant) {
325 *result = (uintptr_t)(atomic_load_acq_64(&tsc_freq) /
326 1000000);
327 break;
328 }
329 /* FALLTHROUGH */
330 default:
331 return (ENOENT);
332 }
333 return (0);
334 }
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