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1 /*-
2  * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
3  *
4  * Copyright (c) 2013 The FreeBSD Foundation
5  * All rights reserved.
6  *
7  * This software was developed by Aleksandr Rybalko under sponsorship from the
8  * FreeBSD Foundation.
9  *
10  * Redistribution and use in source and binary forms, with or without
11  * modification, are permitted provided that the following conditions
12  * are met:
13  * 1. Redistributions of source code must retain the above copyright
14  *    notice, this list of conditions and the following disclaimer.
15  * 2. Redistributions in binary form must reproduce the above copyright
16  *    notice, this list of conditions and the following disclaimer in the
17  *    documentation and/or other materials provided with the distribution.
18  *
19  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
20  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
21  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
22  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
23  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
24  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
25  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
26  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
27  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
28  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
29  * SUCH DAMAGE.
30  *
31  * $FreeBSD$
32  */
33
34 /* Generic framebuffer */
35 /* TODO unlink from VT(9) */
36 /* TODO done normal /dev/fb methods */
37
38 #include <sys/cdefs.h>
39 __FBSDID("$FreeBSD$");
40
41 #include <sys/param.h>
42 #include <sys/systm.h>
43 #include <sys/bus.h>
44 #include <sys/conf.h>
45 #include <sys/kernel.h>
46 #include <sys/malloc.h>
47 #include <sys/module.h>
48 #include <sys/queue.h>
49 #include <sys/fbio.h>
50
51 #include <machine/bus.h>
52
53 #include <dev/vt/vt.h>
54 #include <dev/vt/hw/fb/vt_fb.h>
55
56 #include <vm/vm.h>
57 #include <vm/pmap.h>
58
59 #include "fb_if.h"
60
61 LIST_HEAD(fb_list_head_t, fb_list_entry) fb_list_head =
62     LIST_HEAD_INITIALIZER(fb_list_head);
63 struct fb_list_entry {
64         struct fb_info  *fb_info;
65         struct cdev     *fb_si;
66         LIST_ENTRY(fb_list_entry) fb_list;
67 };
68
69 struct fbd_softc {
70         device_t        sc_dev;
71         struct fb_info  *sc_info;
72 };
73
74 static void fbd_evh_init(void *);
75 /* SI_ORDER_SECOND, just after EVENTHANDLERs initialized. */
76 SYSINIT(fbd_evh_init, SI_SUB_CONFIGURE, SI_ORDER_SECOND, fbd_evh_init, NULL);
77
78 static d_open_t         fb_open;
79 static d_close_t        fb_close;
80 static d_read_t         fb_read;
81 static d_write_t        fb_write;
82 static d_ioctl_t        fb_ioctl;
83 static d_mmap_t         fb_mmap;
84
85 static struct cdevsw fb_cdevsw = {
86         .d_version =    D_VERSION,
87         .d_flags =      D_NEEDGIANT,
88         .d_open =       fb_open,
89         .d_close =      fb_close,
90         .d_read =       fb_read,
91         .d_write =      fb_write,
92         .d_ioctl =      fb_ioctl,
93         .d_mmap =       fb_mmap,
94         .d_name =       "fb",
95 };
96
97 static int framebuffer_dev_unit = 0;
98
99 static int
100 fb_open(struct cdev *dev, int oflags, int devtype, struct thread *td)
101 {
102
103         return (0);
104 }
105
106 static int
107 fb_close(struct cdev *dev, int fflag, int devtype, struct thread *td)
108 {
109
110         return (0);
111 }
112
113 static int
114 fb_ioctl(struct cdev *dev, u_long cmd, caddr_t data, int fflag,
115     struct thread *td)
116 {
117         struct fb_info *info;
118         int error;
119
120         error = 0;
121         info = dev->si_drv1;
122
123         switch (cmd) {
124         case FBIOGTYPE:
125                 bcopy(info, (struct fbtype *)data, sizeof(struct fbtype));
126                 break;
127
128         case FBIO_GETWINORG:    /* get frame buffer window origin */
129                 *(u_int *)data = 0;
130                 break;
131
132         case FBIO_GETDISPSTART: /* get display start address */
133                 ((video_display_start_t *)data)->x = 0;
134                 ((video_display_start_t *)data)->y = 0;
135                 break;
136
137         case FBIO_GETLINEWIDTH: /* get scan line width in bytes */
138                 *(u_int *)data = info->fb_stride;
139                 break;
140
141         case FBIO_BLANK:        /* blank display */
142                 if (info->setblankmode != NULL)
143                         error = info->setblankmode(info->fb_priv, *(int *)data);
144                 break;
145
146         default:
147                 error = ENOIOCTL;
148                 break;
149         }
150         return (error);
151 }
152
153 static int
154 fb_read(struct cdev *dev, struct uio *uio, int ioflag)
155 {
156
157         return (0); /* XXX nothing to read, yet */
158 }
159
160 static int
161 fb_write(struct cdev *dev, struct uio *uio, int ioflag)
162 {
163
164         return (0); /* XXX nothing written */
165 }
166
167 static int
168 fb_mmap(struct cdev *dev, vm_ooffset_t offset, vm_paddr_t *paddr, int nprot,
169     vm_memattr_t *memattr)
170 {
171         struct fb_info *info;
172
173         info = dev->si_drv1;
174
175         if (info->fb_flags & FB_FLAG_NOMMAP)
176                 return (ENODEV);
177
178         if (offset >= 0 && offset < info->fb_size) {
179                 if (info->fb_pbase == 0)
180                         *paddr = vtophys((uint8_t *)info->fb_vbase + offset);
181                 else
182                         *paddr = info->fb_pbase + offset;
183                 if (info->fb_flags & FB_FLAG_MEMATTR)
184                         *memattr = info->fb_memattr;
185                 return (0);
186         }
187         return (EINVAL);
188 }
189
190 static int
191 fb_init(struct fb_list_entry *entry, int unit)
192 {
193         struct fb_info *info;
194
195         info = entry->fb_info;
196         entry->fb_si = make_dev(&fb_cdevsw, unit, UID_ROOT, GID_WHEEL,
197             0600, "fb%d", unit);
198         entry->fb_si->si_drv1 = info;
199         info->fb_cdev = entry->fb_si;
200
201         return (0);
202 }
203
204 int
205 fbd_list()
206 {
207         struct fb_list_entry *entry;
208
209         if (LIST_EMPTY(&fb_list_head))
210                 return (ENOENT);
211
212         LIST_FOREACH(entry, &fb_list_head, fb_list) {
213                 printf("FB %s @%p\n", entry->fb_info->fb_name,
214                     (void *)entry->fb_info->fb_pbase);
215         }
216
217         return (0);
218 }
219
220 static struct fb_list_entry *
221 fbd_find(struct fb_info* info)
222 {
223         struct fb_list_entry *entry, *tmp;
224
225         LIST_FOREACH_SAFE(entry, &fb_list_head, fb_list, tmp) {
226                 if (entry->fb_info == info) {
227                         return (entry);
228                 }
229         }
230
231         return (NULL);
232 }
233
234 int
235 fbd_register(struct fb_info* info)
236 {
237         struct fb_list_entry *entry;
238         int err, first;
239
240         first = 0;
241         if (LIST_EMPTY(&fb_list_head))
242                 first++;
243
244         entry = fbd_find(info);
245         if (entry != NULL) {
246                 /* XXX Update framebuffer params */
247                 return (0);
248         }
249
250         entry = malloc(sizeof(struct fb_list_entry), M_DEVBUF, M_WAITOK|M_ZERO);
251         entry->fb_info = info;
252
253         LIST_INSERT_HEAD(&fb_list_head, entry, fb_list);
254
255         err = fb_init(entry, framebuffer_dev_unit++);
256         if (err)
257                 return (err);
258
259         if (first) {
260                 err = vt_fb_attach(info);
261                 if (err)
262                         return (err);
263         }
264
265         return (0);
266 }
267
268 int
269 fbd_unregister(struct fb_info* info)
270 {
271         struct fb_list_entry *entry, *tmp;
272
273         LIST_FOREACH_SAFE(entry, &fb_list_head, fb_list, tmp) {
274                 if (entry->fb_info == info) {
275                         LIST_REMOVE(entry, fb_list);
276                         if (LIST_EMPTY(&fb_list_head))
277                                 vt_fb_detach(info);
278                         free(entry, M_DEVBUF);
279                         return (0);
280                 }
281         }
282
283         return (ENOENT);
284 }
285
286 static void
287 register_fb_wrap(void *arg, void *ptr)
288 {
289
290         fbd_register((struct fb_info *)ptr);
291 }
292
293 static void
294 unregister_fb_wrap(void *arg, void *ptr)
295 {
296
297         fbd_unregister((struct fb_info *)ptr);
298 }
299
300 static void
301 fbd_evh_init(void *ctx)
302 {
303
304         EVENTHANDLER_REGISTER(register_framebuffer, register_fb_wrap, NULL,
305             EVENTHANDLER_PRI_ANY);
306         EVENTHANDLER_REGISTER(unregister_framebuffer, unregister_fb_wrap, NULL,
307             EVENTHANDLER_PRI_ANY);
308 }
309
310 /* Newbus methods. */
311 static int
312 fbd_probe(device_t dev)
313 {
314
315         return (BUS_PROBE_NOWILDCARD);
316 }
317
318 static int
319 fbd_attach(device_t dev)
320 {
321         struct fbd_softc *sc;
322         int err;
323
324         sc = device_get_softc(dev);
325
326         sc->sc_dev = dev;
327         sc->sc_info = FB_GETINFO(device_get_parent(dev));
328         if (sc->sc_info == NULL)
329                 return (ENXIO);
330         err = fbd_register(sc->sc_info);
331
332         return (err);
333 }
334
335 static int
336 fbd_detach(device_t dev)
337 {
338         struct fbd_softc *sc;
339         int err;
340
341         sc = device_get_softc(dev);
342
343         err = fbd_unregister(sc->sc_info);
344
345         return (err);
346 }
347
348 static device_method_t fbd_methods[] = {
349         /* Device interface */
350         DEVMETHOD(device_probe,         fbd_probe),
351         DEVMETHOD(device_attach,        fbd_attach),
352         DEVMETHOD(device_detach,        fbd_detach),
353
354         DEVMETHOD(device_shutdown,      bus_generic_shutdown),
355
356         { 0, 0 }
357 };
358
359 driver_t fbd_driver = {
360         "fbd",
361         fbd_methods,
362         sizeof(struct fbd_softc)
363 };
364
365 devclass_t      fbd_devclass;
366
367 DRIVER_MODULE(fbd, fb, fbd_driver, fbd_devclass, 0, 0);
368 DRIVER_MODULE(fbd, drmn, fbd_driver, fbd_devclass, 0, 0);
369 DRIVER_MODULE(fbd, udl, fbd_driver, fbd_devclass, 0, 0);
370 MODULE_VERSION(fbd, 1);
371