1 /* $NetBSD: iq31244_7seg.c,v 1.2 2003/07/15 00:25:01 lukem Exp $ */
2
3 /*-
4 * Copyright (c) 2001, 2002, 2003 Wasabi Systems, Inc.
5 * All rights reserved.
6 *
7 * Written by Jason R. Thorpe for Wasabi Systems, Inc.
8 *
9 * Redistribution and use in source and binary forms, with or without
10 * modification, are permitted provided that the following conditions
11 * are met:
12 * 1. Redistributions of source code must retain the above copyright
13 * notice, this list of conditions and the following disclaimer.
14 * 2. Redistributions in binary form must reproduce the above copyright
15 * notice, this list of conditions and the following disclaimer in the
16 * documentation and/or other materials provided with the distribution.
17 * 3. All advertising materials mentioning features or use of this software
18 * must display the following acknowledgement:
19 * This product includes software developed for the NetBSD Project by
20 * Wasabi Systems, Inc.
21 * 4. The name of Wasabi Systems, Inc. may not be used to endorse
22 * or promote products derived from this software without specific prior
23 * written permission.
24 *
25 * THIS SOFTWARE IS PROVIDED BY WASABI SYSTEMS, INC. ``AS IS'' AND
26 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
27 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
28 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL WASABI SYSTEMS, INC
29 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
30 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
31 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
32 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
33 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
34 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
35 * POSSIBILITY OF SUCH DAMAGE.
36 */
37
38 /*
39 * Support for the 7-segment display on the Intel IQ31244.
40 */
41
42 #include <sys/cdefs.h>
43 __FBSDID("$FreeBSD: stable/9/sys/arm/xscale/i80321/iq31244_7seg.c 248085 2013-03-09 02:36:32Z marius $");
44
45 #include <sys/param.h>
46 #include <sys/systm.h>
47 #include <sys/kernel.h>
48 #include <sys/module.h>
49 #include <sys/bus.h>
50 #include <sys/sysctl.h>
51
52 #include <machine/bus.h>
53
54 #include <arm/xscale/i80321/iq80321reg.h>
55 #include <arm/xscale/i80321/iq80321var.h>
56
57 #define WRITE(x, v) *((__volatile uint8_t *) (x)) = (v)
58
59 static int snakestate;
60
61 /*
62 * The 7-segment display looks like so:
63 *
64 * A
65 * +-----+
66 * | |
67 * F | | B
68 * | G |
69 * +-----+
70 * | |
71 * E | | C
72 * | D |
73 * +-----+ o DP
74 *
75 * Setting a bit clears the corresponding segment on the
76 * display.
77 */
78 #define SEG_A (1 << 0)
79 #define SEG_B (1 << 1)
80 #define SEG_C (1 << 2)
81 #define SEG_D (1 << 3)
82 #define SEG_E (1 << 4)
83 #define SEG_F (1 << 5)
84 #define SEG_G (1 << 6)
85 #define SEG_DP (1 << 7)
86
87 static const uint8_t digitmap[] = {
88 /* +#####+
89 * # #
90 * # #
91 * # #
92 * +-----+
93 * # #
94 * # #
95 * # #
96 * +#####+
97 */
98 SEG_G,
99
100 /* +-----+
101 * | #
102 * | #
103 * | #
104 * +-----+
105 * | #
106 * | #
107 * | #
108 * +-----+
109 */
110 SEG_A|SEG_D|SEG_E|SEG_F|SEG_G,
111
112 /* +#####+
113 * | #
114 * | #
115 * | #
116 * +#####+
117 * # |
118 * # |
119 * # |
120 * +#####+
121 */
122 SEG_C|SEG_F,
123
124 /* +#####+
125 * | #
126 * | #
127 * | #
128 * +#####+
129 * | #
130 * | #
131 * | #
132 * +#####+
133 */
134 SEG_E|SEG_F,
135
136 /* +-----+
137 * # #
138 * # #
139 * # #
140 * +#####+
141 * | #
142 * | #
143 * | #
144 * +-----+
145 */
146 SEG_A|SEG_D|SEG_E,
147
148 /* +#####+
149 * # |
150 * # |
151 * # |
152 * +#####+
153 * | #
154 * | #
155 * | #
156 * +#####+
157 */
158 SEG_B|SEG_E,
159
160 /* +#####+
161 * # |
162 * # |
163 * # |
164 * +#####+
165 * # #
166 * # #
167 * # #
168 * +#####+
169 */
170 SEG_B,
171
172 /* +#####+
173 * | #
174 * | #
175 * | #
176 * +-----+
177 * | #
178 * | #
179 * | #
180 * +-----+
181 */
182 SEG_D|SEG_E|SEG_F,
183
184 /* +#####+
185 * # #
186 * # #
187 * # #
188 * +#####+
189 * # #
190 * # #
191 * # #
192 * +#####+
193 */
194 0,
195
196 /* +#####+
197 * # #
198 * # #
199 * # #
200 * +#####+
201 * | #
202 * | #
203 * | #
204 * +-----+
205 */
206 SEG_D|SEG_E,
207 };
208
209 static uint8_t
iq80321_7seg_xlate(char c)210 iq80321_7seg_xlate(char c)
211 {
212 uint8_t rv;
213
214 if (c >= '0' && c <= '9')
215 rv = digitmap[c - '0'];
216 else if (c == '.')
217 rv = (uint8_t) ~SEG_DP;
218 else
219 rv = 0xff;
220
221 return (rv);
222 }
223
224 void
iq80321_7seg(char a,char b)225 iq80321_7seg(char a, char b)
226 {
227 uint8_t msb, lsb;
228
229 msb = iq80321_7seg_xlate(a);
230 lsb = iq80321_7seg_xlate(b);
231
232 snakestate = 0;
233
234 WRITE(IQ80321_7SEG_MSB, msb);
235 WRITE(IQ80321_7SEG_LSB, lsb);
236 }
237
238 static const uint8_t snakemap[][2] = {
239
240 /* +#####+ +#####+
241 * | | | |
242 * | | | |
243 * | | | |
244 * +-----+ +-----+
245 * | | | |
246 * | | | |
247 * | | | |
248 * +-----+ +-----+
249 */
250 { ~SEG_A, ~SEG_A },
251
252 /* +-----+ +-----+
253 * # | | #
254 * # | | #
255 * # | | #
256 * +-----+ +-----+
257 * | | | |
258 * | | | |
259 * | | | |
260 * +-----+ +-----+
261 */
262 { ~SEG_F, ~SEG_B },
263
264 /* +-----+ +-----+
265 * | | | |
266 * | | | |
267 * | | | |
268 * +#####+ +#####+
269 * | | | |
270 * | | | |
271 * | | | |
272 * +-----+ +-----+
273 */
274 { ~SEG_G, ~SEG_G },
275
276 /* +-----+ +-----+
277 * | | | |
278 * | | | |
279 * | | | |
280 * +-----+ +-----+
281 * | # # |
282 * | # # |
283 * | # # |
284 * +-----+ +-----+
285 */
286 { ~SEG_C, ~SEG_E },
287
288 /* +-----+ +-----+
289 * | | | |
290 * | | | |
291 * | | | |
292 * +-----+ +-----+
293 * | | | |
294 * | | | |
295 * | | | |
296 * +#####+ +#####+
297 */
298 { ~SEG_D, ~SEG_D },
299
300 /* +-----+ +-----+
301 * | | | |
302 * | | | |
303 * | | | |
304 * +-----+ +-----+
305 * # | | #
306 * # | | #
307 * # | | #
308 * +-----+ +-----+
309 */
310 { ~SEG_E, ~SEG_C },
311
312 /* +-----+ +-----+
313 * | | | |
314 * | | | |
315 * | | | |
316 * +#####+ +#####+
317 * | | | |
318 * | | | |
319 * | | | |
320 * +-----+ +-----+
321 */
322 { ~SEG_G, ~SEG_G },
323
324 /* +-----+ +-----+
325 * | # # |
326 * | # # |
327 * | # # |
328 * +-----+ +-----+
329 * | | | |
330 * | | | |
331 * | | | |
332 * +-----+ +-----+
333 */
334 { ~SEG_B, ~SEG_F },
335 };
336
337 static SYSCTL_NODE(_hw, OID_AUTO, sevenseg, CTLFLAG_RD, 0, "7 seg");
338 static int freq = 20;
339 SYSCTL_INT(_hw_sevenseg, OID_AUTO, freq, CTLFLAG_RW, &freq, 0,
340 "7 Seg update frequency");
341 static void
iq31244_7seg_snake(void)342 iq31244_7seg_snake(void)
343 {
344 static int snakefreq;
345 int cur = snakestate;
346
347 snakefreq++;
348 if ((snakefreq % freq))
349 return;
350 WRITE(IQ80321_7SEG_MSB, snakemap[cur][0]);
351 WRITE(IQ80321_7SEG_LSB, snakemap[cur][1]);
352
353 snakestate = (cur + 1) & 7;
354 }
355
356 struct iq31244_7seg_softc {
357 device_t dev;
358 };
359
360 static int
iq31244_7seg_probe(device_t dev)361 iq31244_7seg_probe(device_t dev)
362 {
363
364 device_set_desc(dev, "IQ31244 7seg");
365 return (0);
366 }
367
368 extern void (*i80321_hardclock_hook)(void);
369 static int
iq31244_7seg_attach(device_t dev)370 iq31244_7seg_attach(device_t dev)
371 {
372
373 i80321_hardclock_hook = iq31244_7seg_snake;
374 return (0);
375 }
376
377 static device_method_t iq31244_7seg_methods[] = {
378 DEVMETHOD(device_probe, iq31244_7seg_probe),
379 DEVMETHOD(device_attach, iq31244_7seg_attach),
380 {0, 0},
381 };
382
383 static driver_t iq31244_7seg_driver = {
384 "iqseg",
385 iq31244_7seg_methods,
386 sizeof(struct iq31244_7seg_softc),
387 };
388 static devclass_t iq31244_7seg_devclass;
389
390 DRIVER_MODULE(iqseg, iq, iq31244_7seg_driver, iq31244_7seg_devclass, 0, 0);
391