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Fix kernel panic in LinuxKPI subsystem.
[FreeBSD/FreeBSD.git] / sys / dev / fb / fbd.c
1 /*-
2  * Copyright (c) 2013 The FreeBSD Foundation
3  * All rights reserved.
4  *
5  * This software was developed by Aleksandr Rybalko under sponsorship from the
6  * FreeBSD Foundation.
7  *
8  * Redistribution and use in source and binary forms, with or without
9  * modification, are permitted provided that the following conditions
10  * are met:
11  * 1. Redistributions of source code must retain the above copyright
12  *    notice, this list of conditions and the following disclaimer.
13  * 2. Redistributions in binary form must reproduce the above copyright
14  *    notice, this list of conditions and the following disclaimer in the
15  *    documentation and/or other materials provided with the distribution.
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  * $FreeBSD$
30  */
31
32 /* Generic framebuffer */
33 /* TODO unlink from VT(9) */
34 /* TODO done normal /dev/fb methods */
35
36 #include <sys/cdefs.h>
37 __FBSDID("$FreeBSD$");
38
39 #include <sys/param.h>
40 #include <sys/systm.h>
41 #include <sys/bus.h>
42 #include <sys/conf.h>
43 #include <sys/kernel.h>
44 #include <sys/malloc.h>
45 #include <sys/module.h>
46 #include <sys/queue.h>
47 #include <sys/fbio.h>
48
49 #include <machine/bus.h>
50
51 #include <dev/vt/vt.h>
52 #include <dev/vt/hw/fb/vt_fb.h>
53
54 #include <vm/vm.h>
55 #include <vm/pmap.h>
56
57 #include "fb_if.h"
58
59 LIST_HEAD(fb_list_head_t, fb_list_entry) fb_list_head =
60     LIST_HEAD_INITIALIZER(fb_list_head);
61 struct fb_list_entry {
62         struct fb_info  *fb_info;
63         struct cdev     *fb_si;
64         LIST_ENTRY(fb_list_entry) fb_list;
65 };
66
67 struct fbd_softc {
68         device_t        sc_dev;
69         struct fb_info  *sc_info;
70 };
71
72 static void fbd_evh_init(void *);
73 /* SI_ORDER_SECOND, just after EVENTHANDLERs initialized. */
74 SYSINIT(fbd_evh_init, SI_SUB_CONFIGURE, SI_ORDER_SECOND, fbd_evh_init, NULL);
75
76 static d_open_t         fb_open;
77 static d_close_t        fb_close;
78 static d_read_t         fb_read;
79 static d_write_t        fb_write;
80 static d_ioctl_t        fb_ioctl;
81 static d_mmap_t         fb_mmap;
82
83 static struct cdevsw fb_cdevsw = {
84         .d_version =    D_VERSION,
85         .d_flags =      D_NEEDGIANT,
86         .d_open =       fb_open,
87         .d_close =      fb_close,
88         .d_read =       fb_read,
89         .d_write =      fb_write,
90         .d_ioctl =      fb_ioctl,
91         .d_mmap =       fb_mmap,
92         .d_name =       "fb",
93 };
94
95 static int framebuffer_dev_unit = 0;
96
97 static int
98 fb_open(struct cdev *dev, int oflags, int devtype, struct thread *td)
99 {
100
101         return (0);
102 }
103
104 static int
105 fb_close(struct cdev *dev, int fflag, int devtype, struct thread *td)
106 {
107
108         return (0);
109 }
110
111 static int
112 fb_ioctl(struct cdev *dev, u_long cmd, caddr_t data, int fflag,
113     struct thread *td)
114 {
115         struct fb_info *info;
116         int error;
117
118         error = 0;
119         info = dev->si_drv1;
120
121         switch (cmd) {
122         case FBIOGTYPE:
123                 bcopy(info, (struct fbtype *)data, sizeof(struct fbtype));
124                 break;
125
126         case FBIO_GETWINORG:    /* get frame buffer window origin */
127                 *(u_int *)data = 0;
128                 break;
129
130         case FBIO_GETDISPSTART: /* get display start address */
131                 ((video_display_start_t *)data)->x = 0;
132                 ((video_display_start_t *)data)->y = 0;
133                 break;
134
135         case FBIO_GETLINEWIDTH: /* get scan line width in bytes */
136                 *(u_int *)data = info->fb_stride;
137                 break;
138
139         case FBIO_BLANK:        /* blank display */
140                 if (info->setblankmode != NULL)
141                         error = info->setblankmode(info->fb_priv, *(int *)data);
142                 break;
143
144         default:
145                 error = ENOIOCTL;
146                 break;
147         }
148         return (error);
149 }
150
151 static int
152 fb_read(struct cdev *dev, struct uio *uio, int ioflag)
153 {
154
155         return (0); /* XXX nothing to read, yet */
156 }
157
158 static int
159 fb_write(struct cdev *dev, struct uio *uio, int ioflag)
160 {
161
162         return (0); /* XXX nothing written */
163 }
164
165 static int
166 fb_mmap(struct cdev *dev, vm_ooffset_t offset, vm_paddr_t *paddr, int nprot,
167     vm_memattr_t *memattr)
168 {
169         struct fb_info *info;
170
171         info = dev->si_drv1;
172
173         if (info->fb_flags & FB_FLAG_NOMMAP)
174                 return (ENODEV);
175
176         if (offset >= 0 && offset < info->fb_size) {
177                 if (info->fb_pbase == 0)
178                         *paddr = vtophys((uint8_t *)info->fb_vbase + offset);
179                 else
180                         *paddr = info->fb_pbase + offset;
181                 if (info->fb_flags & FB_FLAG_MEMATTR)
182                         *memattr = info->fb_memattr;
183                 return (0);
184         }
185         return (EINVAL);
186 }
187
188 static int
189 fb_init(struct fb_list_entry *entry, int unit)
190 {
191         struct fb_info *info;
192
193         info = entry->fb_info;
194         entry->fb_si = make_dev(&fb_cdevsw, unit, UID_ROOT, GID_WHEEL,
195             0600, "fb%d", unit);
196         entry->fb_si->si_drv1 = info;
197         info->fb_cdev = entry->fb_si;
198
199         return (0);
200 }
201
202 int
203 fbd_list()
204 {
205         struct fb_list_entry *entry;
206
207         if (LIST_EMPTY(&fb_list_head))
208                 return (ENOENT);
209
210         LIST_FOREACH(entry, &fb_list_head, fb_list) {
211                 printf("FB %s @%p\n", entry->fb_info->fb_name,
212                     (void *)entry->fb_info->fb_pbase);
213         }
214
215         return (0);
216 }
217
218 static struct fb_list_entry *
219 fbd_find(struct fb_info* info)
220 {
221         struct fb_list_entry *entry, *tmp;
222
223         LIST_FOREACH_SAFE(entry, &fb_list_head, fb_list, tmp) {
224                 if (entry->fb_info == info) {
225                         return (entry);
226                 }
227         }
228
229         return (NULL);
230 }
231
232 int
233 fbd_register(struct fb_info* info)
234 {
235         struct fb_list_entry *entry;
236         int err, first;
237
238         first = 0;
239         if (LIST_EMPTY(&fb_list_head))
240                 first++;
241
242         entry = fbd_find(info);
243         if (entry != NULL) {
244                 /* XXX Update framebuffer params */
245                 return (0);
246         }
247
248         entry = malloc(sizeof(struct fb_list_entry), M_DEVBUF, M_WAITOK|M_ZERO);
249         entry->fb_info = info;
250
251         LIST_INSERT_HEAD(&fb_list_head, entry, fb_list);
252
253         err = fb_init(entry, framebuffer_dev_unit++);
254         if (err)
255                 return (err);
256
257         if (first) {
258                 err = vt_fb_attach(info);
259                 if (err)
260                         return (err);
261         }
262
263         return (0);
264 }
265
266 int
267 fbd_unregister(struct fb_info* info)
268 {
269         struct fb_list_entry *entry, *tmp;
270
271         LIST_FOREACH_SAFE(entry, &fb_list_head, fb_list, tmp) {
272                 if (entry->fb_info == info) {
273                         LIST_REMOVE(entry, fb_list);
274                         if (LIST_EMPTY(&fb_list_head))
275                                 vt_fb_detach(info);
276                         free(entry, M_DEVBUF);
277                         return (0);
278                 }
279         }
280
281         return (ENOENT);
282 }
283
284 static void
285 register_fb_wrap(void *arg, void *ptr)
286 {
287
288         fbd_register((struct fb_info *)ptr);
289 }
290
291 static void
292 unregister_fb_wrap(void *arg, void *ptr)
293 {
294
295         fbd_unregister((struct fb_info *)ptr);
296 }
297
298 static void
299 fbd_evh_init(void *ctx)
300 {
301
302         EVENTHANDLER_REGISTER(register_framebuffer, register_fb_wrap, NULL,
303             EVENTHANDLER_PRI_ANY);
304         EVENTHANDLER_REGISTER(unregister_framebuffer, unregister_fb_wrap, NULL,
305             EVENTHANDLER_PRI_ANY);
306 }
307
308 /* Newbus methods. */
309 static int
310 fbd_probe(device_t dev)
311 {
312
313         return (BUS_PROBE_NOWILDCARD);
314 }
315
316 static int
317 fbd_attach(device_t dev)
318 {
319         struct fbd_softc *sc;
320         int err;
321
322         sc = device_get_softc(dev);
323
324         sc->sc_dev = dev;
325         sc->sc_info = FB_GETINFO(device_get_parent(dev));
326         if (sc->sc_info == NULL)
327                 return (ENXIO);
328         err = fbd_register(sc->sc_info);
329
330         return (err);
331 }
332
333 static int
334 fbd_detach(device_t dev)
335 {
336         struct fbd_softc *sc;
337         int err;
338
339         sc = device_get_softc(dev);
340
341         err = fbd_unregister(sc->sc_info);
342
343         return (err);
344 }
345
346 static device_method_t fbd_methods[] = {
347         /* Device interface */
348         DEVMETHOD(device_probe,         fbd_probe),
349         DEVMETHOD(device_attach,        fbd_attach),
350         DEVMETHOD(device_detach,        fbd_detach),
351
352         DEVMETHOD(device_shutdown,      bus_generic_shutdown),
353
354         { 0, 0 }
355 };
356
357 driver_t fbd_driver = {
358         "fbd",
359         fbd_methods,
360         sizeof(struct fbd_softc)
361 };
362
363 devclass_t      fbd_devclass;
364
365 DRIVER_MODULE(fbd, fb, fbd_driver, fbd_devclass, 0, 0);
366 DRIVER_MODULE(fbd, drmn, fbd_driver, fbd_devclass, 0, 0);
367 DRIVER_MODULE(fbd, udl, fbd_driver, fbd_devclass, 0, 0);
368 MODULE_VERSION(fbd, 1);
369