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zr36016.c
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1 /*
2  * Zoran ZR36016 basic configuration functions
3  *
4  * Copyright (C) 2001 Wolfgang Scherr <[email protected]>
5  *
6  * $Id: zr36016.c,v 1.1.2.14 2003/08/20 19:46:55 rbultje Exp $
7  *
8  * ------------------------------------------------------------------------
9  *
10  * This program is free software; you can redistribute it and/or modify
11  * it under the terms of the GNU General Public License as published by
12  * the Free Software Foundation; either version 2 of the License, or
13  * (at your option) any later version.
14  *
15  * This program is distributed in the hope that it will be useful,
16  * but WITHOUT ANY WARRANTY; without even the implied warranty of
17  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
18  * GNU General Public License for more details.
19  *
20  * You should have received a copy of the GNU General Public License
21  * along with this program; if not, write to the Free Software
22  * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
23  *
24  * ------------------------------------------------------------------------
25  */
26 
27 #define ZR016_VERSION "v0.7"
28 
29 #include <linux/module.h>
30 #include <linux/init.h>
31 #include <linux/slab.h>
32 #include <linux/delay.h>
33 
34 #include <linux/types.h>
35 #include <linux/wait.h>
36 
37 /* I/O commands, error codes */
38 #include <asm/io.h>
39 
40 /* v4l API */
41 
42 /* headerfile of this module */
43 #include "zr36016.h"
44 
45 /* codec io API */
46 #include "videocodec.h"
47 
48 /* it doesn't make sense to have more than 20 or so,
49  just to prevent some unwanted loops */
50 #define MAX_CODECS 20
51 
52 /* amount of chips attached via this driver */
53 static int zr36016_codecs;
54 
55 /* debugging is available via module parameter */
56 static int debug;
57 module_param(debug, int, 0);
58 MODULE_PARM_DESC(debug, "Debug level (0-4)");
59 
60 #define dprintk(num, format, args...) \
61  do { \
62  if (debug >= num) \
63  printk(format, ##args); \
64  } while (0)
65 
66 /* =========================================================================
67  Local hardware I/O functions:
68 
69  read/write via codec layer (registers are located in the master device)
70  ========================================================================= */
71 
72 /* read and write functions */
73 static u8
74 zr36016_read (struct zr36016 *ptr,
75  u16 reg)
76 {
77  u8 value = 0;
78 
79  // just in case something is wrong...
80  if (ptr->codec->master_data->readreg)
81  value =
82  (ptr->codec->master_data->
83  readreg(ptr->codec, reg)) & 0xFF;
84  else
85  dprintk(1,
86  KERN_ERR "%s: invalid I/O setup, nothing read!\n",
87  ptr->name);
88 
89  dprintk(4, "%s: reading from 0x%04x: %02x\n", ptr->name, reg,
90  value);
91 
92  return value;
93 }
94 
95 static void
96 zr36016_write (struct zr36016 *ptr,
97  u16 reg,
98  u8 value)
99 {
100  dprintk(4, "%s: writing 0x%02x to 0x%04x\n", ptr->name, value,
101  reg);
102 
103  // just in case something is wrong...
104  if (ptr->codec->master_data->writereg) {
105  ptr->codec->master_data->writereg(ptr->codec, reg, value);
106  } else
107  dprintk(1,
108  KERN_ERR
109  "%s: invalid I/O setup, nothing written!\n",
110  ptr->name);
111 }
112 
113 /* indirect read and write functions */
114 /* the 016 supports auto-addr-increment, but
115  * writing it all time cost not much and is safer... */
116 static u8
117 zr36016_readi (struct zr36016 *ptr,
118  u16 reg)
119 {
120  u8 value = 0;
121 
122  // just in case something is wrong...
123  if ((ptr->codec->master_data->writereg) &&
124  (ptr->codec->master_data->readreg)) {
125  ptr->codec->master_data->writereg(ptr->codec, ZR016_IADDR, reg & 0x0F); // ADDR
126  value = (ptr->codec->master_data->readreg(ptr->codec, ZR016_IDATA)) & 0xFF; // DATA
127  } else
128  dprintk(1,
129  KERN_ERR
130  "%s: invalid I/O setup, nothing read (i)!\n",
131  ptr->name);
132 
133  dprintk(4, "%s: reading indirect from 0x%04x: %02x\n", ptr->name,
134  reg, value);
135  return value;
136 }
137 
138 static void
139 zr36016_writei (struct zr36016 *ptr,
140  u16 reg,
141  u8 value)
142 {
143  dprintk(4, "%s: writing indirect 0x%02x to 0x%04x\n", ptr->name,
144  value, reg);
145 
146  // just in case something is wrong...
147  if (ptr->codec->master_data->writereg) {
148  ptr->codec->master_data->writereg(ptr->codec, ZR016_IADDR, reg & 0x0F); // ADDR
149  ptr->codec->master_data->writereg(ptr->codec, ZR016_IDATA, value & 0x0FF); // DATA
150  } else
151  dprintk(1,
152  KERN_ERR
153  "%s: invalid I/O setup, nothing written (i)!\n",
154  ptr->name);
155 }
156 
157 /* =========================================================================
158  Local helper function:
159 
160  version read
161  ========================================================================= */
162 
163 /* version kept in datastructure */
164 static u8
165 zr36016_read_version (struct zr36016 *ptr)
166 {
167  ptr->version = zr36016_read(ptr, 0) >> 4;
168  return ptr->version;
169 }
170 
171 /* =========================================================================
172  Local helper function:
173 
174  basic test of "connectivity", writes/reads to/from PAX-Lo register
175  ========================================================================= */
176 
177 static int
178 zr36016_basic_test (struct zr36016 *ptr)
179 {
180  if (debug) {
181  int i;
182  zr36016_writei(ptr, ZR016I_PAX_LO, 0x55);
183  dprintk(1, KERN_INFO "%s: registers: ", ptr->name);
184  for (i = 0; i <= 0x0b; i++)
185  dprintk(1, "%02x ", zr36016_readi(ptr, i));
186  dprintk(1, "\n");
187  }
188  // for testing just write 0, then the default value to a register and read
189  // it back in both cases
190  zr36016_writei(ptr, ZR016I_PAX_LO, 0x00);
191  if (zr36016_readi(ptr, ZR016I_PAX_LO) != 0x0) {
192  dprintk(1,
193  KERN_ERR
194  "%s: attach failed, can't connect to vfe processor!\n",
195  ptr->name);
196  return -ENXIO;
197  }
198  zr36016_writei(ptr, ZR016I_PAX_LO, 0x0d0);
199  if (zr36016_readi(ptr, ZR016I_PAX_LO) != 0x0d0) {
200  dprintk(1,
201  KERN_ERR
202  "%s: attach failed, can't connect to vfe processor!\n",
203  ptr->name);
204  return -ENXIO;
205  }
206  // we allow version numbers from 0-3, should be enough, though
207  zr36016_read_version(ptr);
208  if (ptr->version & 0x0c) {
209  dprintk(1,
210  KERN_ERR
211  "%s: attach failed, suspicious version %d found...\n",
212  ptr->name, ptr->version);
213  return -ENXIO;
214  }
215 
216  return 0; /* looks good! */
217 }
218 
219 /* =========================================================================
220  Local helper function:
221 
222  simple loop for pushing the init datasets - NO USE --
223  ========================================================================= */
224 
225 #if 0
226 static int zr36016_pushit (struct zr36016 *ptr,
227  u16 startreg,
228  u16 len,
229  const char *data)
230 {
231  int i=0;
232 
233  dprintk(4, "%s: write data block to 0x%04x (len=%d)\n",
234  ptr->name, startreg,len);
235  while (i<len) {
236  zr36016_writei(ptr, startreg++, data[i++]);
237  }
238 
239  return i;
240 }
241 #endif
242 
243 /* =========================================================================
244  Basic datasets & init:
245 
246  //TODO//
247  ========================================================================= */
248 
249 // needed offset values PAL NTSC SECAM
250 static const int zr016_xoff[] = { 20, 20, 20 };
251 static const int zr016_yoff[] = { 8, 9, 7 };
252 
253 static void
254 zr36016_init (struct zr36016 *ptr)
255 {
256  // stop any processing
257  zr36016_write(ptr, ZR016_GOSTOP, 0);
258 
259  // mode setup (yuv422 in and out, compression/expansuon due to mode)
262  (ptr->mode == CODEC_DO_COMPRESSION ?
264 
265  // misc setup
266  zr36016_writei(ptr, ZR016I_SETUP1,
267  (ptr->xdec ? (ZR016_HRFL | ZR016_HORZ) : 0) |
268  (ptr->ydec ? ZR016_VERT : 0) | ZR016_CNTI);
269  zr36016_writei(ptr, ZR016I_SETUP2, ZR016_CCIR);
270 
271  // Window setup
272  // (no extra offset for now, norm defines offset, default width height)
273  zr36016_writei(ptr, ZR016I_PAX_HI, ptr->width >> 8);
274  zr36016_writei(ptr, ZR016I_PAX_LO, ptr->width & 0xFF);
275  zr36016_writei(ptr, ZR016I_PAY_HI, ptr->height >> 8);
276  zr36016_writei(ptr, ZR016I_PAY_LO, ptr->height & 0xFF);
277  zr36016_writei(ptr, ZR016I_NAX_HI, ptr->xoff >> 8);
278  zr36016_writei(ptr, ZR016I_NAX_LO, ptr->xoff & 0xFF);
279  zr36016_writei(ptr, ZR016I_NAY_HI, ptr->yoff >> 8);
280  zr36016_writei(ptr, ZR016I_NAY_LO, ptr->yoff & 0xFF);
281 
282  /* shall we continue now, please? */
283  zr36016_write(ptr, ZR016_GOSTOP, 1);
284 }
285 
286 /* =========================================================================
287  CODEC API FUNCTIONS
288 
289  this functions are accessed by the master via the API structure
290  ========================================================================= */
291 
292 /* set compression/expansion mode and launches codec -
293  this should be the last call from the master before starting processing */
294 static int
295 zr36016_set_mode (struct videocodec *codec,
296  int mode)
297 {
298  struct zr36016 *ptr = (struct zr36016 *) codec->data;
299 
300  dprintk(2, "%s: set_mode %d call\n", ptr->name, mode);
301 
302  if ((mode != CODEC_DO_EXPANSION) && (mode != CODEC_DO_COMPRESSION))
303  return -EINVAL;
304 
305  ptr->mode = mode;
306  zr36016_init(ptr);
307 
308  return 0;
309 }
310 
311 /* set picture size */
312 static int
313 zr36016_set_video (struct videocodec *codec,
314  struct tvnorm *norm,
315  struct vfe_settings *cap,
316  struct vfe_polarity *pol)
317 {
318  struct zr36016 *ptr = (struct zr36016 *) codec->data;
319 
320  dprintk(2, "%s: set_video %d.%d, %d/%d-%dx%d (0x%x) call\n",
321  ptr->name, norm->HStart, norm->VStart,
322  cap->x, cap->y, cap->width, cap->height,
323  cap->decimation);
324 
325  /* if () return -EINVAL;
326  * trust the master driver that it knows what it does - so
327  * we allow invalid startx/y for now ... */
328  ptr->width = cap->width;
329  ptr->height = cap->height;
330  /* (Ronald) This is ugly. zoran_device.c, line 387
331  * already mentions what happens if HStart is even
332  * (blue faces, etc., cr/cb inversed). There's probably
333  * some good reason why HStart is 0 instead of 1, so I'm
334  * leaving it to this for now, but really... This can be
335  * done a lot simpler */
336  ptr->xoff = (norm->HStart ? norm->HStart : 1) + cap->x;
337  /* Something to note here (I don't understand it), setting
338  * VStart too high will cause the codec to 'not work'. I
339  * really don't get it. values of 16 (VStart) already break
340  * it here. Just '0' seems to work. More testing needed! */
341  ptr->yoff = norm->VStart + cap->y;
342  /* (Ronald) dzjeeh, can't this thing do hor_decimation = 4? */
343  ptr->xdec = ((cap->decimation & 0xff) == 1) ? 0 : 1;
344  ptr->ydec = (((cap->decimation >> 8) & 0xff) == 1) ? 0 : 1;
345 
346  return 0;
347 }
348 
349 /* additional control functions */
350 static int
351 zr36016_control (struct videocodec *codec,
352  int type,
353  int size,
354  void *data)
355 {
356  struct zr36016 *ptr = (struct zr36016 *) codec->data;
357  int *ival = (int *) data;
358 
359  dprintk(2, "%s: control %d call with %d byte\n", ptr->name, type,
360  size);
361 
362  switch (type) {
363  case CODEC_G_STATUS: /* get last status - we don't know it ... */
364  if (size != sizeof(int))
365  return -EFAULT;
366  *ival = 0;
367  break;
368 
369  case CODEC_G_CODEC_MODE:
370  if (size != sizeof(int))
371  return -EFAULT;
372  *ival = 0;
373  break;
374 
375  case CODEC_S_CODEC_MODE:
376  if (size != sizeof(int))
377  return -EFAULT;
378  if (*ival != 0)
379  return -EINVAL;
380  /* not needed, do nothing */
381  return 0;
382 
383  case CODEC_G_VFE:
384  case CODEC_S_VFE:
385  return 0;
386 
387  case CODEC_S_MMAP:
388  /* not available, give an error */
389  return -ENXIO;
390 
391  default:
392  return -EINVAL;
393  }
394 
395  return size;
396 }
397 
398 /* =========================================================================
399  Exit and unregister function:
400 
401  Deinitializes Zoran's JPEG processor
402  ========================================================================= */
403 
404 static int
405 zr36016_unset (struct videocodec *codec)
406 {
407  struct zr36016 *ptr = codec->data;
408 
409  if (ptr) {
410  /* do wee need some codec deinit here, too ???? */
411 
412  dprintk(1, "%s: finished codec #%d\n", ptr->name,
413  ptr->num);
414  kfree(ptr);
415  codec->data = NULL;
416 
417  zr36016_codecs--;
418  return 0;
419  }
420 
421  return -EFAULT;
422 }
423 
424 /* =========================================================================
425  Setup and registry function:
426 
427  Initializes Zoran's JPEG processor
428 
429  Also sets pixel size, average code size, mode (compr./decompr.)
430  (the given size is determined by the processor with the video interface)
431  ========================================================================= */
432 
433 static int
434 zr36016_setup (struct videocodec *codec)
435 {
436  struct zr36016 *ptr;
437  int res;
438 
439  dprintk(2, "zr36016: initializing VFE subsystem #%d.\n",
440  zr36016_codecs);
441 
442  if (zr36016_codecs == MAX_CODECS) {
443  dprintk(1,
444  KERN_ERR "zr36016: Can't attach more codecs!\n");
445  return -ENOSPC;
446  }
447  //mem structure init
448  codec->data = ptr = kzalloc(sizeof(struct zr36016), GFP_KERNEL);
449  if (NULL == ptr) {
450  dprintk(1, KERN_ERR "zr36016: Can't get enough memory!\n");
451  return -ENOMEM;
452  }
453 
454  snprintf(ptr->name, sizeof(ptr->name), "zr36016[%d]",
455  zr36016_codecs);
456  ptr->num = zr36016_codecs++;
457  ptr->codec = codec;
458 
459  //testing
460  res = zr36016_basic_test(ptr);
461  if (res < 0) {
462  zr36016_unset(codec);
463  return res;
464  }
465  //final setup
466  ptr->mode = CODEC_DO_COMPRESSION;
467  ptr->width = 768;
468  ptr->height = 288;
469  ptr->xdec = 1;
470  ptr->ydec = 0;
471  zr36016_init(ptr);
472 
473  dprintk(1, KERN_INFO "%s: codec v%d attached and running\n",
474  ptr->name, ptr->version);
475 
476  return 0;
477 }
478 
479 static const struct videocodec zr36016_codec = {
480  .owner = THIS_MODULE,
481  .name = "zr36016",
482  .magic = 0L, // magic not used
483  .flags =
486  .type = CODEC_TYPE_ZR36016,
487  .setup = zr36016_setup, // functionality
488  .unset = zr36016_unset,
489  .set_mode = zr36016_set_mode,
490  .set_video = zr36016_set_video,
491  .control = zr36016_control,
492  // others are not used
493 };
494 
495 /* =========================================================================
496  HOOK IN DRIVER AS KERNEL MODULE
497  ========================================================================= */
498 
499 static int __init
500 zr36016_init_module (void)
501 {
502  //dprintk(1, "ZR36016 driver %s\n",ZR016_VERSION);
503  zr36016_codecs = 0;
504  return videocodec_register(&zr36016_codec);
505 }
506 
507 static void __exit
508 zr36016_cleanup_module (void)
509 {
510  if (zr36016_codecs) {
511  dprintk(1,
512  "zr36016: something's wrong - %d codecs left somehow.\n",
513  zr36016_codecs);
514  }
515  videocodec_unregister(&zr36016_codec);
516 }
517 
518 module_init(zr36016_init_module);
519 module_exit(zr36016_cleanup_module);
520 
521 MODULE_AUTHOR("Wolfgang Scherr <[email protected]>");
522 MODULE_DESCRIPTION("Driver module for ZR36016 video frontends "
523  ZR016_VERSION);
524 MODULE_LICENSE("GPL");