1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3 * Zoran ZR36016 basic configuration functions
4 *
5 * Copyright (C) 2001 Wolfgang Scherr <scherr@net4you.at>
6 */
7
8 #include <linux/module.h>
9 #include <linux/init.h>
10 #include <linux/slab.h>
11
12 /* headerfile of this module */
13 #include "zr36016.h"
14
15 /* codec io API */
16 #include "videocodec.h"
17
18 /*
19 * it doesn't make sense to have more than 20 or so,
20 * just to prevent some unwanted loops
21 */
22 #define MAX_CODECS 20
23
24 /* amount of chips attached via this driver */
25 static int zr36016_codecs;
26
27 /*
28 * Local hardware I/O functions: read/write via codec layer
29 * (registers are located in the master device)
30 */
31
32 /* read and write functions */
zr36016_read(struct zr36016 * ptr,u16 reg)33 static u8 zr36016_read(struct zr36016 *ptr, u16 reg)
34 {
35 u8 value = 0;
36 struct zoran *zr = videocodec_to_zoran(ptr->codec);
37
38 /* just in case something is wrong... */
39 if (ptr->codec->master_data->readreg)
40 value = (ptr->codec->master_data->readreg(ptr->codec, reg)) & 0xFF;
41 else
42 zrdev_err(zr, "%s: invalid I/O setup, nothing read!\n", ptr->name);
43
44 zrdev_dbg(zr, "%s: reading from 0x%04x: %02x\n", ptr->name, reg, value);
45
46 return value;
47 }
48
zr36016_write(struct zr36016 * ptr,u16 reg,u8 value)49 static void zr36016_write(struct zr36016 *ptr, u16 reg, u8 value)
50 {
51 struct zoran *zr = videocodec_to_zoran(ptr->codec);
52
53 zrdev_dbg(zr, "%s: writing 0x%02x to 0x%04x\n", ptr->name, value, reg);
54
55 // just in case something is wrong...
56 if (ptr->codec->master_data->writereg)
57 ptr->codec->master_data->writereg(ptr->codec, reg, value);
58 else
59 zrdev_err(zr, "%s: invalid I/O setup, nothing written!\n", ptr->name);
60 }
61
62 /*
63 * indirect read and write functions
64 *
65 * the 016 supports auto-addr-increment, but
66 * writing it all time cost not much and is safer...
67 */
zr36016_readi(struct zr36016 * ptr,u16 reg)68 static u8 zr36016_readi(struct zr36016 *ptr, u16 reg)
69 {
70 u8 value = 0;
71 struct zoran *zr = videocodec_to_zoran(ptr->codec);
72
73 /* just in case something is wrong... */
74 if ((ptr->codec->master_data->writereg) && (ptr->codec->master_data->readreg)) {
75 ptr->codec->master_data->writereg(ptr->codec, ZR016_IADDR, reg & 0x0F);
76 value = (ptr->codec->master_data->readreg(ptr->codec, ZR016_IDATA)) & 0xFF;
77 } else {
78 zrdev_err(zr, "%s: invalid I/O setup, nothing read (i)!\n", ptr->name);
79 }
80
81 zrdev_dbg(zr, "%s: reading indirect from 0x%04x: %02x\n",
82 ptr->name, reg, value);
83 return value;
84 }
85
zr36016_writei(struct zr36016 * ptr,u16 reg,u8 value)86 static void zr36016_writei(struct zr36016 *ptr, u16 reg, u8 value)
87 {
88 struct zoran *zr = videocodec_to_zoran(ptr->codec);
89
90 zrdev_dbg(zr, "%s: writing indirect 0x%02x to 0x%04x\n", ptr->name,
91 value, reg);
92
93 /* just in case something is wrong... */
94 if (ptr->codec->master_data->writereg) {
95 ptr->codec->master_data->writereg(ptr->codec, ZR016_IADDR, reg & 0x0F);
96 ptr->codec->master_data->writereg(ptr->codec, ZR016_IDATA, value & 0x0FF);
97 } else {
98 zrdev_err(zr, "%s: invalid I/O setup, nothing written (i)!\n", ptr->name);
99 }
100 }
101
102 /* Local helper function: version read */
103
104 /* version kept in datastructure */
zr36016_read_version(struct zr36016 * ptr)105 static u8 zr36016_read_version(struct zr36016 *ptr)
106 {
107 ptr->version = zr36016_read(ptr, 0) >> 4;
108 return ptr->version;
109 }
110
111 /*
112 * Local helper function: basic test of "connectivity", writes/reads
113 * to/from PAX-Lo register
114 */
115
zr36016_basic_test(struct zr36016 * ptr)116 static int zr36016_basic_test(struct zr36016 *ptr)
117 {
118 struct zoran *zr = videocodec_to_zoran(ptr->codec);
119
120 if (*KERN_INFO <= CONSOLE_LOGLEVEL_DEFAULT) {
121 int i;
122
123 zr36016_writei(ptr, ZR016I_PAX_LO, 0x55);
124 zrdev_dbg(zr, "%s: registers: ", ptr->name);
125 for (i = 0; i <= 0x0b; i++)
126 zrdev_dbg(zr, "%02x ", zr36016_readi(ptr, i));
127 zrdev_dbg(zr, "\n");
128 }
129 // for testing just write 0, then the default value to a register and read
130 // it back in both cases
131 zr36016_writei(ptr, ZR016I_PAX_LO, 0x00);
132 if (zr36016_readi(ptr, ZR016I_PAX_LO) != 0x0) {
133 zrdev_err(zr, "%s: attach failed, can't connect to vfe processor!\n", ptr->name);
134 return -ENXIO;
135 }
136 zr36016_writei(ptr, ZR016I_PAX_LO, 0x0d0);
137 if (zr36016_readi(ptr, ZR016I_PAX_LO) != 0x0d0) {
138 zrdev_err(zr, "%s: attach failed, can't connect to vfe processor!\n", ptr->name);
139 return -ENXIO;
140 }
141 // we allow version numbers from 0-3, should be enough, though
142 zr36016_read_version(ptr);
143 if (ptr->version & 0x0c) {
144 zrdev_err(zr, "%s: attach failed, suspicious version %d found...\n", ptr->name,
145 ptr->version);
146 return -ENXIO;
147 }
148
149 return 0; /* looks good! */
150 }
151
152 /* Basic datasets & init */
153
zr36016_init(struct zr36016 * ptr)154 static void zr36016_init(struct zr36016 *ptr)
155 {
156 // stop any processing
157 zr36016_write(ptr, ZR016_GOSTOP, 0);
158
159 // mode setup (yuv422 in and out, compression/expansuon due to mode)
160 zr36016_write(ptr, ZR016_MODE,
161 ZR016_YUV422 | ZR016_YUV422_YUV422 |
162 (ptr->mode == CODEC_DO_COMPRESSION ?
163 ZR016_COMPRESSION : ZR016_EXPANSION));
164
165 // misc setup
166 zr36016_writei(ptr, ZR016I_SETUP1,
167 (ptr->xdec ? (ZR016_HRFL | ZR016_HORZ) : 0) |
168 (ptr->ydec ? ZR016_VERT : 0) | ZR016_CNTI);
169 zr36016_writei(ptr, ZR016I_SETUP2, ZR016_CCIR);
170
171 // Window setup
172 // (no extra offset for now, norm defines offset, default width height)
173 zr36016_writei(ptr, ZR016I_PAX_HI, ptr->width >> 8);
174 zr36016_writei(ptr, ZR016I_PAX_LO, ptr->width & 0xFF);
175 zr36016_writei(ptr, ZR016I_PAY_HI, ptr->height >> 8);
176 zr36016_writei(ptr, ZR016I_PAY_LO, ptr->height & 0xFF);
177 zr36016_writei(ptr, ZR016I_NAX_HI, ptr->xoff >> 8);
178 zr36016_writei(ptr, ZR016I_NAX_LO, ptr->xoff & 0xFF);
179 zr36016_writei(ptr, ZR016I_NAY_HI, ptr->yoff >> 8);
180 zr36016_writei(ptr, ZR016I_NAY_LO, ptr->yoff & 0xFF);
181
182 /* shall we continue now, please? */
183 zr36016_write(ptr, ZR016_GOSTOP, 1);
184 }
185
186 /*
187 * CODEC API FUNCTIONS
188 *
189 * These functions are accessed by the master via the API structure
190 */
191
192 /*
193 * set compression/expansion mode and launches codec -
194 * this should be the last call from the master before starting processing
195 */
zr36016_set_mode(struct videocodec * codec,int mode)196 static int zr36016_set_mode(struct videocodec *codec, int mode)
197 {
198 struct zr36016 *ptr = (struct zr36016 *)codec->data;
199 struct zoran *zr = videocodec_to_zoran(codec);
200
201 zrdev_dbg(zr, "%s: set_mode %d call\n", ptr->name, mode);
202
203 if ((mode != CODEC_DO_EXPANSION) && (mode != CODEC_DO_COMPRESSION))
204 return -EINVAL;
205
206 ptr->mode = mode;
207 zr36016_init(ptr);
208
209 return 0;
210 }
211
212 /* set picture size */
zr36016_set_video(struct videocodec * codec,const struct tvnorm * norm,struct vfe_settings * cap,struct vfe_polarity * pol)213 static int zr36016_set_video(struct videocodec *codec, const struct tvnorm *norm,
214 struct vfe_settings *cap, struct vfe_polarity *pol)
215 {
216 struct zr36016 *ptr = (struct zr36016 *)codec->data;
217 struct zoran *zr = videocodec_to_zoran(codec);
218
219 zrdev_dbg(zr, "%s: set_video %d.%d, %d/%d-%dx%d (0x%x) call\n",
220 ptr->name, norm->h_start, norm->v_start,
221 cap->x, cap->y, cap->width, cap->height,
222 cap->decimation);
223
224 /*
225 * if () return -EINVAL;
226 * trust the master driver that it knows what it does - so
227 * we allow invalid startx/y for now ...
228 */
229 ptr->width = cap->width;
230 ptr->height = cap->height;
231 /*
232 * (Ronald) This is ugly. zoran_device.c, line 387
233 * already mentions what happens if h_start is even
234 * (blue faces, etc., cr/cb inversed). There's probably
235 * some good reason why h_start is 0 instead of 1, so I'm
236 * leaving it to this for now, but really... This can be
237 * done a lot simpler
238 */
239 ptr->xoff = (norm->h_start ? norm->h_start : 1) + cap->x;
240 /*
241 * Something to note here (I don't understand it), setting
242 * v_start too high will cause the codec to 'not work'. I
243 * really don't get it. values of 16 (v_start) already break
244 * it here. Just '0' seems to work. More testing needed!
245 */
246 ptr->yoff = norm->v_start + cap->y;
247 /* (Ronald) dzjeeh, can't this thing do hor_decimation = 4? */
248 ptr->xdec = ((cap->decimation & 0xff) == 1) ? 0 : 1;
249 ptr->ydec = (((cap->decimation >> 8) & 0xff) == 1) ? 0 : 1;
250
251 return 0;
252 }
253
254 /* additional control functions */
zr36016_control(struct videocodec * codec,int type,int size,void * data)255 static int zr36016_control(struct videocodec *codec, int type, int size, void *data)
256 {
257 struct zr36016 *ptr = (struct zr36016 *)codec->data;
258 struct zoran *zr = videocodec_to_zoran(codec);
259 int *ival = (int *)data;
260
261 zrdev_dbg(zr, "%s: control %d call with %d byte\n",
262 ptr->name, type, size);
263
264 switch (type) {
265 case CODEC_G_STATUS: /* get last status - we don't know it ... */
266 if (size != sizeof(int))
267 return -EFAULT;
268 *ival = 0;
269 break;
270
271 case CODEC_G_CODEC_MODE:
272 if (size != sizeof(int))
273 return -EFAULT;
274 *ival = 0;
275 break;
276
277 case CODEC_S_CODEC_MODE:
278 if (size != sizeof(int))
279 return -EFAULT;
280 if (*ival != 0)
281 return -EINVAL;
282 /* not needed, do nothing */
283 return 0;
284
285 case CODEC_G_VFE:
286 case CODEC_S_VFE:
287 return 0;
288
289 case CODEC_S_MMAP:
290 /* not available, give an error */
291 return -ENXIO;
292
293 default:
294 return -EINVAL;
295 }
296
297 return size;
298 }
299
300 /*
301 * Exit and unregister function:
302 *
303 * Deinitializes Zoran's JPEG processor
304 */
305
zr36016_unset(struct videocodec * codec)306 static int zr36016_unset(struct videocodec *codec)
307 {
308 struct zr36016 *ptr = codec->data;
309 struct zoran *zr = videocodec_to_zoran(codec);
310
311 if (ptr) {
312 /* do wee need some codec deinit here, too ???? */
313
314 zrdev_dbg(zr, "%s: finished codec #%d\n", ptr->name, ptr->num);
315 kfree(ptr);
316 codec->data = NULL;
317
318 zr36016_codecs--;
319 return 0;
320 }
321
322 return -EFAULT;
323 }
324
325 /*
326 * Setup and registry function:
327 *
328 * Initializes Zoran's JPEG processor
329 *
330 * Also sets pixel size, average code size, mode (compr./decompr.)
331 * (the given size is determined by the processor with the video interface)
332 */
333
zr36016_setup(struct videocodec * codec)334 static int zr36016_setup(struct videocodec *codec)
335 {
336 struct zr36016 *ptr;
337 struct zoran *zr = videocodec_to_zoran(codec);
338 int res;
339
340 zrdev_dbg(zr, "zr36016: initializing VFE subsystem #%d.\n", zr36016_codecs);
341
342 if (zr36016_codecs == MAX_CODECS) {
343 zrdev_err(zr, "zr36016: Can't attach more codecs!\n");
344 return -ENOSPC;
345 }
346 //mem structure init
347 ptr = kzalloc(sizeof(*ptr), GFP_KERNEL);
348 codec->data = ptr;
349 if (!ptr)
350 return -ENOMEM;
351
352 snprintf(ptr->name, sizeof(ptr->name), "zr36016[%d]", zr36016_codecs);
353 ptr->num = zr36016_codecs++;
354 ptr->codec = codec;
355
356 //testing
357 res = zr36016_basic_test(ptr);
358 if (res < 0) {
359 zr36016_unset(codec);
360 return res;
361 }
362 //final setup
363 ptr->mode = CODEC_DO_COMPRESSION;
364 ptr->width = 768;
365 ptr->height = 288;
366 ptr->xdec = 1;
367 ptr->ydec = 0;
368 zr36016_init(ptr);
369
370 zrdev_dbg(zr, "%s: codec v%d attached and running\n",
371 ptr->name, ptr->version);
372
373 return 0;
374 }
375
376 static const struct videocodec zr36016_codec = {
377 .name = "zr36016",
378 .magic = 0L, /* magic not used */
379 .flags =
380 CODEC_FLAG_HARDWARE | CODEC_FLAG_VFE | CODEC_FLAG_ENCODER |
381 CODEC_FLAG_DECODER,
382 .type = CODEC_TYPE_ZR36016,
383 .setup = zr36016_setup, /* functionality */
384 .unset = zr36016_unset,
385 .set_mode = zr36016_set_mode,
386 .set_video = zr36016_set_video,
387 .control = zr36016_control,
388 /* others are not used */
389 };
390
391 /* HOOK IN DRIVER AS KERNEL MODULE */
392
zr36016_init_module(void)393 int zr36016_init_module(void)
394 {
395 zr36016_codecs = 0;
396 return videocodec_register(&zr36016_codec);
397 }
398
zr36016_cleanup_module(void)399 void zr36016_cleanup_module(void)
400 {
401 if (zr36016_codecs) {
402 pr_debug("zr36016: something's wrong - %d codecs left somehow.\n",
403 zr36016_codecs);
404 }
405 videocodec_unregister(&zr36016_codec);
406 }
407