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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 "fb_if.h"
55
56 LIST_HEAD(fb_list_head_t, fb_list_entry) fb_list_head =
57     LIST_HEAD_INITIALIZER(fb_list_head);
58 struct fb_list_entry {
59         struct fb_info  *fb_info;
60         struct cdev     *fb_si;
61         LIST_ENTRY(fb_list_entry) fb_list;
62 };
63
64 struct fbd_softc {
65         device_t        sc_dev;
66         struct fb_info  *sc_info;
67 };
68
69 static void fbd_evh_init(void *);
70 /* SI_ORDER_SECOND, just after EVENTHANDLERs initialized. */
71 SYSINIT(fbd_evh_init, SI_SUB_CONFIGURE, SI_ORDER_SECOND, fbd_evh_init, NULL);
72
73 static d_open_t         fb_open;
74 static d_close_t        fb_close;
75 static d_read_t         fb_read;
76 static d_write_t        fb_write;
77 static d_ioctl_t        fb_ioctl;
78 static d_mmap_t         fb_mmap;
79
80 static struct cdevsw fb_cdevsw = {
81         .d_version =    D_VERSION,
82         .d_flags =      D_NEEDGIANT,
83         .d_open =       fb_open,
84         .d_close =      fb_close,
85         .d_read =       fb_read,
86         .d_write =      fb_write,
87         .d_ioctl =      fb_ioctl,
88         .d_mmap =       fb_mmap,
89         .d_name =       "fb",
90 };
91
92 static int framebuffer_dev_unit = 0;
93
94 static int
95 fb_open(struct cdev *dev, int oflags, int devtype, struct thread *td)
96 {
97
98         return (0);
99 }
100
101 static int
102 fb_close(struct cdev *dev, int fflag, int devtype, struct thread *td)
103 {
104
105         return (0);
106 }
107
108 static int
109 fb_ioctl(struct cdev *dev, u_long cmd, caddr_t data, int fflag,
110     struct thread *td)
111 {
112         struct fb_info *info;
113         int error;
114
115         error = 0;
116         info = dev->si_drv1;
117
118         switch (cmd) {
119         case FBIOGTYPE:
120                 bcopy(info, (struct fbtype *)data, sizeof(struct fbtype));
121                 break;
122
123         case FBIO_GETWINORG:    /* get frame buffer window origin */
124                 *(u_int *)data = 0;
125                 break;
126
127         case FBIO_GETDISPSTART: /* get display start address */
128                 ((video_display_start_t *)data)->x = 0;
129                 ((video_display_start_t *)data)->y = 0;
130                 break;
131
132         case FBIO_GETLINEWIDTH: /* get scan line width in bytes */
133                 *(u_int *)data = info->fb_stride;
134                 break;
135
136         case FBIO_BLANK:        /* blank display */
137                 error = 0;      /* TODO */
138                 break;
139
140         default:
141                 error = ENOIOCTL;
142                 break;
143         }
144         return (error);
145 }
146
147 static int
148 fb_read(struct cdev *dev, struct uio *uio, int ioflag)
149 {
150
151         return (0); /* XXX nothing to read, yet */
152 }
153
154 static int
155 fb_write(struct cdev *dev, struct uio *uio, int ioflag)
156 {
157
158         return (0); /* XXX nothing written */
159 }
160
161 static int
162 fb_mmap(struct cdev *dev, vm_ooffset_t offset, vm_paddr_t *paddr, int nprot,
163     vm_memattr_t *memattr)
164 {
165         struct fb_info *info;
166
167         info = dev->si_drv1;
168
169         if ((info->fb_flags & FB_FLAG_NOMMAP) || info->fb_pbase == 0)
170                 return (ENODEV);
171
172         if (offset < info->fb_size) {
173                 *paddr = info->fb_pbase + offset;
174                 return (0);
175         }
176         return (EINVAL);
177 }
178
179 static int
180 fb_init(struct fb_list_entry *entry, int unit)
181 {
182         struct fb_info *info;
183
184         info = entry->fb_info;
185         entry->fb_si = make_dev(&fb_cdevsw, unit, UID_ROOT, GID_WHEEL,
186             0600, "fb%d", unit);
187         entry->fb_si->si_drv1 = info;
188         info->fb_cdev = entry->fb_si;
189
190         return (0);
191 }
192
193 int
194 fbd_list()
195 {
196         struct fb_list_entry *entry;
197
198         if (LIST_EMPTY(&fb_list_head))
199                 return (ENOENT);
200
201         LIST_FOREACH(entry, &fb_list_head, fb_list) {
202                 printf("FB %s @%p\n", entry->fb_info->fb_name,
203                     (void *)entry->fb_info->fb_pbase);
204         }
205
206         return (0);
207 }
208
209 static struct fb_list_entry *
210 fbd_find(struct fb_info* info)
211 {
212         struct fb_list_entry *entry, *tmp;
213
214         LIST_FOREACH_SAFE(entry, &fb_list_head, fb_list, tmp) {
215                 if (entry->fb_info == info) {
216                         return (entry);
217                 }
218         }
219
220         return (NULL);
221 }
222
223 int
224 fbd_register(struct fb_info* info)
225 {
226         struct fb_list_entry *entry;
227         int err, first;
228
229         first = 0;
230         if (LIST_EMPTY(&fb_list_head))
231                 first++;
232
233         entry = fbd_find(info);
234         if (entry != NULL) {
235                 /* XXX Update framebuffer params */
236                 return (0);
237         }
238
239         entry = malloc(sizeof(struct fb_list_entry), M_DEVBUF, M_WAITOK|M_ZERO);
240         entry->fb_info = info;
241
242         LIST_INSERT_HEAD(&fb_list_head, entry, fb_list);
243
244         err = fb_init(entry, framebuffer_dev_unit++);
245         if (err)
246                 return (err);
247
248         if (first) {
249                 err = vt_fb_attach(info);
250                 if (err)
251                         return (err);
252         }
253
254         return (0);
255 }
256
257 int
258 fbd_unregister(struct fb_info* info)
259 {
260         struct fb_list_entry *entry, *tmp;
261
262         LIST_FOREACH_SAFE(entry, &fb_list_head, fb_list, tmp) {
263                 if (entry->fb_info == info) {
264                         LIST_REMOVE(entry, fb_list);
265                         free(entry, M_DEVBUF);
266                         return (0);
267                 }
268         }
269
270         return (ENOENT);
271 }
272
273 static void
274 register_fb_wrap(void *arg, void *ptr)
275 {
276
277         fbd_register((struct fb_info *)ptr);
278 }
279
280 static void
281 unregister_fb_wrap(void *arg, void *ptr)
282 {
283
284         fbd_unregister((struct fb_info *)ptr);
285 }
286
287 static void
288 fbd_evh_init(void *ctx)
289 {
290
291         EVENTHANDLER_REGISTER(register_framebuffer, register_fb_wrap, NULL,
292             EVENTHANDLER_PRI_ANY);
293         EVENTHANDLER_REGISTER(unregister_framebuffer, unregister_fb_wrap, NULL,
294             EVENTHANDLER_PRI_ANY);
295 }
296
297 /* Newbus methods. */
298 static int
299 fbd_probe(device_t dev)
300 {
301
302         return (BUS_PROBE_NOWILDCARD);
303 }
304
305 static int
306 fbd_attach(device_t dev)
307 {
308         struct fbd_softc *sc;
309         int err;
310
311         sc = device_get_softc(dev);
312
313         sc->sc_dev = dev;
314         sc->sc_info = FB_GETINFO(device_get_parent(dev));
315         if (sc->sc_info == NULL)
316                 return (ENXIO);
317         err = fbd_register(sc->sc_info);
318
319         return (err);
320 }
321
322 static int
323 fbd_detach(device_t dev)
324 {
325         struct fbd_softc *sc;
326         int err;
327
328         sc = device_get_softc(dev);
329
330         err = fbd_unregister(sc->sc_info);
331
332         return (err);
333 }
334
335 static device_method_t fbd_methods[] = {
336         /* Device interface */
337         DEVMETHOD(device_probe,         fbd_probe),
338         DEVMETHOD(device_attach,        fbd_attach),
339         DEVMETHOD(device_detach,        fbd_detach),
340
341         DEVMETHOD(device_shutdown,      bus_generic_shutdown),
342
343         { 0, 0 }
344 };
345
346 driver_t fbd_driver = {
347         "fbd",
348         fbd_methods,
349         sizeof(struct fbd_softc)
350 };
351
352 devclass_t      fbd_devclass;
353
354 DRIVER_MODULE(fbd, fb, fbd_driver, fbd_devclass, 0, 0);
355 DRIVER_MODULE(fbd, drmn, fbd_driver, fbd_devclass, 0, 0);
356 MODULE_VERSION(fbd, 1);
357