FreeBSD/Linux Kernel Cross Reference
sys/dev/pci/vga_pci.c
1 /*-
2 * Copyright (c) 2005 John Baldwin <jhb@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, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
13 * 3. Neither the name of the author nor the names of any co-contributors
14 * may be used to endorse or promote products derived from this software
15 * without specific prior written permission.
16 *
17 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
20 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
26 * OUT 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/dev/pci/vga_pci.c 216590 2010-12-20 14:54:24Z jhb $");
32
33 /*
34 * Simple driver for PCI VGA display devices. Drivers such as agp(4) and
35 * drm(4) should attach as children of this device.
36 *
37 * XXX: The vgapci name is a hack until we somehow merge the isa vga driver
38 * in or rename it.
39 */
40
41 #include <sys/param.h>
42 #include <sys/bus.h>
43 #include <sys/kernel.h>
44 #include <sys/module.h>
45 #include <sys/rman.h>
46 #include <sys/sysctl.h>
47 #include <sys/systm.h>
48
49 #include <dev/pci/pcireg.h>
50 #include <dev/pci/pcivar.h>
51
52 struct vga_resource {
53 struct resource *vr_res;
54 int vr_refs;
55 };
56
57 struct vga_pci_softc {
58 device_t vga_msi_child; /* Child driver using MSI. */
59 struct vga_resource vga_res[PCIR_MAX_BAR_0 + 1];
60 };
61
62 SYSCTL_DECL(_hw_pci);
63
64 int vga_pci_default_unit = -1;
65 TUNABLE_INT("hw.pci.default_vgapci_unit", &vga_pci_default_unit);
66 SYSCTL_INT(_hw_pci, OID_AUTO, default_vgapci_unit, CTLFLAG_RDTUN,
67 &vga_pci_default_unit, -1, "Default VGA-compatible display");
68
69 static int
70 vga_pci_probe(device_t dev)
71 {
72 device_t bdev;
73 int unit;
74 uint16_t bctl;
75
76 switch (pci_get_class(dev)) {
77 case PCIC_DISPLAY:
78 break;
79 case PCIC_OLD:
80 if (pci_get_subclass(dev) != PCIS_OLD_VGA)
81 return (ENXIO);
82 break;
83 default:
84 return (ENXIO);
85 }
86
87 /* Probe default display. */
88 unit = device_get_unit(dev);
89 bdev = device_get_parent(device_get_parent(dev));
90 bctl = pci_read_config(bdev, PCIR_BRIDGECTL_1, 2);
91 if (vga_pci_default_unit < 0 && (bctl & PCIB_BCR_VGA_ENABLE) != 0)
92 vga_pci_default_unit = unit;
93 if (vga_pci_default_unit == unit)
94 device_set_flags(dev, 1);
95
96 device_set_desc(dev, "VGA-compatible display");
97 return (BUS_PROBE_GENERIC);
98 }
99
100 static int
101 vga_pci_attach(device_t dev)
102 {
103
104 bus_generic_probe(dev);
105
106 /* Always create a drm child for now to make it easier on drm. */
107 device_add_child(dev, "drm", -1);
108 bus_generic_attach(dev);
109 return (0);
110 }
111
112 static int
113 vga_pci_suspend(device_t dev)
114 {
115
116 return (bus_generic_suspend(dev));
117 }
118
119 static int
120 vga_pci_resume(device_t dev)
121 {
122
123 return (bus_generic_resume(dev));
124 }
125
126 /* Bus interface. */
127
128 static int
129 vga_pci_read_ivar(device_t dev, device_t child, int which, uintptr_t *result)
130 {
131
132 return (BUS_READ_IVAR(device_get_parent(dev), dev, which, result));
133 }
134
135 static int
136 vga_pci_write_ivar(device_t dev, device_t child, int which, uintptr_t value)
137 {
138
139 return (EINVAL);
140 }
141
142 static int
143 vga_pci_setup_intr(device_t dev, device_t child, struct resource *irq,
144 int flags, driver_filter_t *filter, driver_intr_t *intr, void *arg,
145 void **cookiep)
146 {
147 return (BUS_SETUP_INTR(device_get_parent(dev), dev, irq, flags,
148 filter, intr, arg, cookiep));
149 }
150
151 static int
152 vga_pci_teardown_intr(device_t dev, device_t child, struct resource *irq,
153 void *cookie)
154 {
155 return (BUS_TEARDOWN_INTR(device_get_parent(dev), dev, irq, cookie));
156 }
157
158 static struct resource *
159 vga_pci_alloc_resource(device_t dev, device_t child, int type, int *rid,
160 u_long start, u_long end, u_long count, u_int flags)
161 {
162 struct vga_pci_softc *sc;
163 int bar;
164
165 switch (type) {
166 case SYS_RES_MEMORY:
167 case SYS_RES_IOPORT:
168 /*
169 * For BARs, we cache the resource so that we only allocate it
170 * from the PCI bus once.
171 */
172 bar = PCI_RID2BAR(*rid);
173 if (bar < 0 || bar > PCIR_MAX_BAR_0)
174 return (NULL);
175 sc = device_get_softc(dev);
176 if (sc->vga_res[bar].vr_res == NULL)
177 sc->vga_res[bar].vr_res = bus_alloc_resource(dev, type,
178 rid, start, end, count, flags);
179 if (sc->vga_res[bar].vr_res != NULL)
180 sc->vga_res[bar].vr_refs++;
181 return (sc->vga_res[bar].vr_res);
182 }
183 return (bus_alloc_resource(dev, type, rid, start, end, count, flags));
184 }
185
186 static int
187 vga_pci_release_resource(device_t dev, device_t child, int type, int rid,
188 struct resource *r)
189 {
190 struct vga_pci_softc *sc;
191 int bar, error;
192
193 switch (type) {
194 case SYS_RES_MEMORY:
195 case SYS_RES_IOPORT:
196 /*
197 * For BARs, we release the resource from the PCI bus
198 * when the last child reference goes away.
199 */
200 bar = PCI_RID2BAR(rid);
201 if (bar < 0 || bar > PCIR_MAX_BAR_0)
202 return (EINVAL);
203 sc = device_get_softc(dev);
204 if (sc->vga_res[bar].vr_res == NULL)
205 return (EINVAL);
206 KASSERT(sc->vga_res[bar].vr_res == r,
207 ("vga_pci resource mismatch"));
208 if (sc->vga_res[bar].vr_refs > 1) {
209 sc->vga_res[bar].vr_refs--;
210 return (0);
211 }
212 KASSERT(sc->vga_res[bar].vr_refs > 0,
213 ("vga_pci resource reference count underflow"));
214 error = bus_release_resource(dev, type, rid, r);
215 if (error == 0) {
216 sc->vga_res[bar].vr_res = NULL;
217 sc->vga_res[bar].vr_refs = 0;
218 }
219 return (error);
220 }
221
222 return (bus_release_resource(dev, type, rid, r));
223 }
224
225 /* PCI interface. */
226
227 static uint32_t
228 vga_pci_read_config(device_t dev, device_t child, int reg, int width)
229 {
230
231 return (pci_read_config(dev, reg, width));
232 }
233
234 static void
235 vga_pci_write_config(device_t dev, device_t child, int reg,
236 uint32_t val, int width)
237 {
238
239 pci_write_config(dev, reg, val, width);
240 }
241
242 static int
243 vga_pci_enable_busmaster(device_t dev, device_t child)
244 {
245
246 return (pci_enable_busmaster(dev));
247 }
248
249 static int
250 vga_pci_disable_busmaster(device_t dev, device_t child)
251 {
252
253 return (pci_disable_busmaster(dev));
254 }
255
256 static int
257 vga_pci_enable_io(device_t dev, device_t child, int space)
258 {
259
260 device_printf(dev, "child %s requested pci_enable_io\n",
261 device_get_nameunit(child));
262 return (pci_enable_io(dev, space));
263 }
264
265 static int
266 vga_pci_disable_io(device_t dev, device_t child, int space)
267 {
268
269 device_printf(dev, "child %s requested pci_disable_io\n",
270 device_get_nameunit(child));
271 return (pci_disable_io(dev, space));
272 }
273
274 static int
275 vga_pci_get_vpd_ident(device_t dev, device_t child, const char **identptr)
276 {
277
278 return (pci_get_vpd_ident(dev, identptr));
279 }
280
281 static int
282 vga_pci_get_vpd_readonly(device_t dev, device_t child, const char *kw,
283 const char **vptr)
284 {
285
286 return (pci_get_vpd_readonly(dev, kw, vptr));
287 }
288
289 static int
290 vga_pci_set_powerstate(device_t dev, device_t child, int state)
291 {
292
293 device_printf(dev, "child %s requested pci_set_powerstate\n",
294 device_get_nameunit(child));
295 return (pci_set_powerstate(dev, state));
296 }
297
298 static int
299 vga_pci_get_powerstate(device_t dev, device_t child)
300 {
301
302 device_printf(dev, "child %s requested pci_get_powerstate\n",
303 device_get_nameunit(child));
304 return (pci_get_powerstate(dev));
305 }
306
307 static int
308 vga_pci_assign_interrupt(device_t dev, device_t child)
309 {
310
311 device_printf(dev, "child %s requested pci_assign_interrupt\n",
312 device_get_nameunit(child));
313 return (PCI_ASSIGN_INTERRUPT(device_get_parent(dev), dev));
314 }
315
316 static int
317 vga_pci_find_extcap(device_t dev, device_t child, int capability,
318 int *capreg)
319 {
320
321 return (pci_find_extcap(dev, capability, capreg));
322 }
323
324 static int
325 vga_pci_alloc_msi(device_t dev, device_t child, int *count)
326 {
327 struct vga_pci_softc *sc;
328 int error;
329
330 sc = device_get_softc(dev);
331 if (sc->vga_msi_child != NULL)
332 return (EBUSY);
333 error = pci_alloc_msi(dev, count);
334 if (error == 0)
335 sc->vga_msi_child = child;
336 return (error);
337 }
338
339 static int
340 vga_pci_alloc_msix(device_t dev, device_t child, int *count)
341 {
342 struct vga_pci_softc *sc;
343 int error;
344
345 sc = device_get_softc(dev);
346 if (sc->vga_msi_child != NULL)
347 return (EBUSY);
348 error = pci_alloc_msix(dev, count);
349 if (error == 0)
350 sc->vga_msi_child = child;
351 return (error);
352 }
353
354 static int
355 vga_pci_remap_msix(device_t dev, device_t child, int count,
356 const u_int *vectors)
357 {
358 struct vga_pci_softc *sc;
359
360 sc = device_get_softc(dev);
361 if (sc->vga_msi_child != child)
362 return (ENXIO);
363 return (pci_remap_msix(dev, count, vectors));
364 }
365
366 static int
367 vga_pci_release_msi(device_t dev, device_t child)
368 {
369 struct vga_pci_softc *sc;
370 int error;
371
372 sc = device_get_softc(dev);
373 if (sc->vga_msi_child != child)
374 return (ENXIO);
375 error = pci_release_msi(dev);
376 if (error == 0)
377 sc->vga_msi_child = NULL;
378 return (error);
379 }
380
381 static int
382 vga_pci_msi_count(device_t dev, device_t child)
383 {
384
385 return (pci_msi_count(dev));
386 }
387
388 static int
389 vga_pci_msix_count(device_t dev, device_t child)
390 {
391
392 return (pci_msix_count(dev));
393 }
394
395 static device_method_t vga_pci_methods[] = {
396 /* Device interface */
397 DEVMETHOD(device_probe, vga_pci_probe),
398 DEVMETHOD(device_attach, vga_pci_attach),
399 DEVMETHOD(device_shutdown, bus_generic_shutdown),
400 DEVMETHOD(device_suspend, vga_pci_suspend),
401 DEVMETHOD(device_resume, vga_pci_resume),
402
403 /* Bus interface */
404 DEVMETHOD(bus_read_ivar, vga_pci_read_ivar),
405 DEVMETHOD(bus_write_ivar, vga_pci_write_ivar),
406 DEVMETHOD(bus_setup_intr, vga_pci_setup_intr),
407 DEVMETHOD(bus_teardown_intr, vga_pci_teardown_intr),
408 DEVMETHOD(bus_alloc_resource, vga_pci_alloc_resource),
409 DEVMETHOD(bus_release_resource, vga_pci_release_resource),
410 DEVMETHOD(bus_activate_resource, bus_generic_activate_resource),
411 DEVMETHOD(bus_deactivate_resource, bus_generic_deactivate_resource),
412
413 /* PCI interface */
414 DEVMETHOD(pci_read_config, vga_pci_read_config),
415 DEVMETHOD(pci_write_config, vga_pci_write_config),
416 DEVMETHOD(pci_enable_busmaster, vga_pci_enable_busmaster),
417 DEVMETHOD(pci_disable_busmaster, vga_pci_disable_busmaster),
418 DEVMETHOD(pci_enable_io, vga_pci_enable_io),
419 DEVMETHOD(pci_disable_io, vga_pci_disable_io),
420 DEVMETHOD(pci_get_vpd_ident, vga_pci_get_vpd_ident),
421 DEVMETHOD(pci_get_vpd_readonly, vga_pci_get_vpd_readonly),
422 DEVMETHOD(pci_get_powerstate, vga_pci_get_powerstate),
423 DEVMETHOD(pci_set_powerstate, vga_pci_set_powerstate),
424 DEVMETHOD(pci_assign_interrupt, vga_pci_assign_interrupt),
425 DEVMETHOD(pci_find_extcap, vga_pci_find_extcap),
426 DEVMETHOD(pci_alloc_msi, vga_pci_alloc_msi),
427 DEVMETHOD(pci_alloc_msix, vga_pci_alloc_msix),
428 DEVMETHOD(pci_remap_msix, vga_pci_remap_msix),
429 DEVMETHOD(pci_release_msi, vga_pci_release_msi),
430 DEVMETHOD(pci_msi_count, vga_pci_msi_count),
431 DEVMETHOD(pci_msix_count, vga_pci_msix_count),
432
433 { 0, 0 }
434 };
435
436 static driver_t vga_pci_driver = {
437 "vgapci",
438 vga_pci_methods,
439 sizeof(struct vga_pci_softc),
440 };
441
442 static devclass_t vga_devclass;
443
444 DRIVER_MODULE(vgapci, pci, vga_pci_driver, vga_devclass, 0, 0);
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