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Linux/sound/mips/au1x00.c

  1 /*
  2  * BRIEF MODULE DESCRIPTION
  3  *  Driver for AMD Au1000 MIPS Processor, AC'97 Sound Port
  4  *
  5  * Copyright 2004 Cooper Street Innovations Inc.
  6  * Author: Charles Eidsness     <charles@cooper-street.com>
  7  *
  8  *  This program is free software; you can redistribute  it and/or modify it
  9  *  under  the terms of  the GNU General  Public License as published by the
 10  *  Free Software Foundation;  either version 2 of the  License, or (at your
 11  *  option) any later version.
 12  *
 13  *  THIS  SOFTWARE  IS PROVIDED   ``AS  IS'' AND   ANY  EXPRESS OR IMPLIED
 14  *  WARRANTIES,   INCLUDING, BUT NOT  LIMITED  TO, THE IMPLIED WARRANTIES OF
 15  *  MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.  IN
 16  *  NO  EVENT  SHALL   THE AUTHOR  BE    LIABLE FOR ANY   DIRECT, INDIRECT,
 17  *  INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
 18  *  NOT LIMITED   TO, PROCUREMENT OF  SUBSTITUTE GOODS  OR SERVICES; LOSS OF
 19  *  USE, DATA,  OR PROFITS; OR  BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
 20  *  ANY THEORY OF LIABILITY, WHETHER IN  CONTRACT, STRICT LIABILITY, OR TORT
 21  *  (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
 22  *  THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 23  *
 24  *  You should have received a copy of the  GNU General Public License along
 25  *  with this program; if not, write  to the Free Software Foundation, Inc.,
 26  *  675 Mass Ave, Cambridge, MA 02139, USA.
 27  *
 28  * History:
 29  *
 30  * 2004-09-09 Charles Eidsness  -- Original verion -- based on
 31  *                                sa11xx-uda1341.c ALSA driver and the
 32  *                                au1000.c OSS driver.
 33  * 2004-09-09 Matt Porter       -- Added support for ALSA 1.0.6
 34  *
 35  */
 36 
 37 #include <linux/ioport.h>
 38 #include <linux/interrupt.h>
 39 #include <linux/init.h>
 40 #include <linux/platform_device.h>
 41 #include <linux/slab.h>
 42 #include <linux/module.h>
 43 #include <sound/core.h>
 44 #include <sound/initval.h>
 45 #include <sound/pcm.h>
 46 #include <sound/pcm_params.h>
 47 #include <sound/ac97_codec.h>
 48 #include <asm/mach-au1x00/au1000.h>
 49 #include <asm/mach-au1x00/au1000_dma.h>
 50 
 51 MODULE_AUTHOR("Charles Eidsness <charles@cooper-street.com>");
 52 MODULE_DESCRIPTION("Au1000 AC'97 ALSA Driver");
 53 MODULE_LICENSE("GPL");
 54 MODULE_SUPPORTED_DEVICE("{{AMD,Au1000 AC'97}}");
 55 
 56 #define PLAYBACK 0
 57 #define CAPTURE 1
 58 #define AC97_SLOT_3 0x01
 59 #define AC97_SLOT_4 0x02
 60 #define AC97_SLOT_6 0x08
 61 #define AC97_CMD_IRQ 31
 62 #define READ 0
 63 #define WRITE 1
 64 #define READ_WAIT 2
 65 #define RW_DONE 3
 66 
 67 struct au1000_period
 68 {
 69         u32 start;
 70         u32 relative_end;       /*realtive to start of buffer*/
 71         struct au1000_period * next;
 72 };
 73 
 74 /*Au1000 AC97 Port Control Reisters*/
 75 struct au1000_ac97_reg {
 76         u32 volatile config;
 77         u32 volatile status;
 78         u32 volatile data;
 79         u32 volatile cmd;
 80         u32 volatile cntrl;
 81 };
 82 
 83 struct audio_stream {
 84         struct snd_pcm_substream *substream;
 85         int dma;
 86         spinlock_t dma_lock;
 87         struct au1000_period * buffer;
 88         unsigned int period_size;
 89         unsigned int periods;
 90 };
 91 
 92 struct snd_au1000 {
 93         struct snd_card *card;
 94         struct au1000_ac97_reg volatile *ac97_ioport;
 95 
 96         struct resource *ac97_res_port;
 97         spinlock_t ac97_lock;
 98         struct snd_ac97 *ac97;
 99 
100         struct snd_pcm *pcm;
101         struct audio_stream *stream[2]; /* playback & capture */
102         int dmaid[2];           /* tx(0)/rx(1) DMA ids */
103 };
104 
105 /*--------------------------- Local Functions --------------------------------*/
106 static void
107 au1000_set_ac97_xmit_slots(struct snd_au1000 *au1000, long xmit_slots)
108 {
109         u32 volatile ac97_config;
110 
111         spin_lock(&au1000->ac97_lock);
112         ac97_config = au1000->ac97_ioport->config;
113         ac97_config = ac97_config & ~AC97C_XMIT_SLOTS_MASK;
114         ac97_config |= (xmit_slots << AC97C_XMIT_SLOTS_BIT);
115         au1000->ac97_ioport->config = ac97_config;
116         spin_unlock(&au1000->ac97_lock);
117 }
118 
119 static void
120 au1000_set_ac97_recv_slots(struct snd_au1000 *au1000, long recv_slots)
121 {
122         u32 volatile ac97_config;
123 
124         spin_lock(&au1000->ac97_lock);
125         ac97_config = au1000->ac97_ioport->config;
126         ac97_config = ac97_config & ~AC97C_RECV_SLOTS_MASK;
127         ac97_config |= (recv_slots << AC97C_RECV_SLOTS_BIT);
128         au1000->ac97_ioport->config = ac97_config;
129         spin_unlock(&au1000->ac97_lock);
130 }
131 
132 
133 static void
134 au1000_release_dma_link(struct audio_stream *stream)
135 {
136         struct au1000_period * pointer;
137         struct au1000_period * pointer_next;
138 
139         stream->period_size = 0;
140         stream->periods = 0;
141         pointer = stream->buffer;
142         if (! pointer)
143                 return;
144         do {
145                 pointer_next = pointer->next;
146                 kfree(pointer);
147                 pointer = pointer_next;
148         } while (pointer != stream->buffer);
149         stream->buffer = NULL;
150 }
151 
152 static int
153 au1000_setup_dma_link(struct audio_stream *stream, unsigned int period_bytes,
154                       unsigned int periods)
155 {
156         struct snd_pcm_substream *substream = stream->substream;
157         struct snd_pcm_runtime *runtime = substream->runtime;
158         struct au1000_period *pointer;
159         unsigned long dma_start;
160         int i;
161 
162         dma_start = virt_to_phys(runtime->dma_area);
163 
164         if (stream->period_size == period_bytes &&
165             stream->periods == periods)
166                 return 0; /* not changed */
167 
168         au1000_release_dma_link(stream);
169 
170         stream->period_size = period_bytes;
171         stream->periods = periods;
172 
173         stream->buffer = kmalloc(sizeof(struct au1000_period), GFP_KERNEL);
174         if (! stream->buffer)
175                 return -ENOMEM;
176         pointer = stream->buffer;
177         for (i = 0; i < periods; i++) {
178                 pointer->start = (u32)(dma_start + (i * period_bytes));
179                 pointer->relative_end = (u32) (((i+1) * period_bytes) - 0x1);
180                 if (i < periods - 1) {
181                         pointer->next = kmalloc(sizeof(struct au1000_period), GFP_KERNEL);
182                         if (! pointer->next) {
183                                 au1000_release_dma_link(stream);
184                                 return -ENOMEM;
185                         }
186                         pointer = pointer->next;
187                 }
188         }
189         pointer->next = stream->buffer;
190         return 0;
191 }
192 
193 static void
194 au1000_dma_stop(struct audio_stream *stream)
195 {
196         if (snd_BUG_ON(!stream->buffer))
197                 return;
198         disable_dma(stream->dma);
199 }
200 
201 static void
202 au1000_dma_start(struct audio_stream *stream)
203 {
204         if (snd_BUG_ON(!stream->buffer))
205                 return;
206 
207         init_dma(stream->dma);
208         if (get_dma_active_buffer(stream->dma) == 0) {
209                 clear_dma_done0(stream->dma);
210                 set_dma_addr0(stream->dma, stream->buffer->start);
211                 set_dma_count0(stream->dma, stream->period_size >> 1);
212                 set_dma_addr1(stream->dma, stream->buffer->next->start);
213                 set_dma_count1(stream->dma, stream->period_size >> 1);
214         } else {
215                 clear_dma_done1(stream->dma);
216                 set_dma_addr1(stream->dma, stream->buffer->start);
217                 set_dma_count1(stream->dma, stream->period_size >> 1);
218                 set_dma_addr0(stream->dma, stream->buffer->next->start);
219                 set_dma_count0(stream->dma, stream->period_size >> 1);
220         }
221         enable_dma_buffers(stream->dma);
222         start_dma(stream->dma);
223 }
224 
225 static irqreturn_t
226 au1000_dma_interrupt(int irq, void *dev_id)
227 {
228         struct audio_stream *stream = (struct audio_stream *) dev_id;
229         struct snd_pcm_substream *substream = stream->substream;
230 
231         spin_lock(&stream->dma_lock);
232         switch (get_dma_buffer_done(stream->dma)) {
233         case DMA_D0:
234                 stream->buffer = stream->buffer->next;
235                 clear_dma_done0(stream->dma);
236                 set_dma_addr0(stream->dma, stream->buffer->next->start);
237                 set_dma_count0(stream->dma, stream->period_size >> 1);
238                 enable_dma_buffer0(stream->dma);
239                 break;
240         case DMA_D1:
241                 stream->buffer = stream->buffer->next;
242                 clear_dma_done1(stream->dma);
243                 set_dma_addr1(stream->dma, stream->buffer->next->start);
244                 set_dma_count1(stream->dma, stream->period_size >> 1);
245                 enable_dma_buffer1(stream->dma);
246                 break;
247         case (DMA_D0 | DMA_D1):
248                 printk(KERN_ERR "DMA %d missed interrupt.\n",stream->dma);
249                 au1000_dma_stop(stream);
250                 au1000_dma_start(stream);
251                 break;
252         case (~DMA_D0 & ~DMA_D1):
253                 printk(KERN_ERR "DMA %d empty irq.\n",stream->dma);
254         }
255         spin_unlock(&stream->dma_lock);
256         snd_pcm_period_elapsed(substream);
257         return IRQ_HANDLED;
258 }
259 
260 /*-------------------------- PCM Audio Streams -------------------------------*/
261 
262 static unsigned int rates[] = {8000, 11025, 16000, 22050};
263 static struct snd_pcm_hw_constraint_list hw_constraints_rates = {
264         .count  = ARRAY_SIZE(rates),
265         .list   = rates,
266         .mask   = 0,
267 };
268 
269 static struct snd_pcm_hardware snd_au1000_hw =
270 {
271         .info                   = (SNDRV_PCM_INFO_INTERLEAVED | \
272                                 SNDRV_PCM_INFO_MMAP | SNDRV_PCM_INFO_MMAP_VALID),
273         .formats                = SNDRV_PCM_FMTBIT_S16_LE,
274         .rates                  = (SNDRV_PCM_RATE_8000 | SNDRV_PCM_RATE_11025 |
275                                 SNDRV_PCM_RATE_16000 | SNDRV_PCM_RATE_22050),
276         .rate_min               = 8000,
277         .rate_max               = 22050,
278         .channels_min           = 1,
279         .channels_max           = 2,
280         .buffer_bytes_max       = 128*1024,
281         .period_bytes_min       = 32,
282         .period_bytes_max       = 16*1024,
283         .periods_min            = 8,
284         .periods_max            = 255,
285         .fifo_size              = 16,
286 };
287 
288 static int
289 snd_au1000_playback_open(struct snd_pcm_substream *substream)
290 {
291         struct snd_au1000 *au1000 = substream->pcm->private_data;
292 
293         au1000->stream[PLAYBACK]->substream = substream;
294         au1000->stream[PLAYBACK]->buffer = NULL;
295         substream->private_data = au1000->stream[PLAYBACK];
296         substream->runtime->hw = snd_au1000_hw;
297         return (snd_pcm_hw_constraint_list(substream->runtime, 0,
298                 SNDRV_PCM_HW_PARAM_RATE, &hw_constraints_rates) < 0);
299 }
300 
301 static int
302 snd_au1000_capture_open(struct snd_pcm_substream *substream)
303 {
304         struct snd_au1000 *au1000 = substream->pcm->private_data;
305 
306         au1000->stream[CAPTURE]->substream = substream;
307         au1000->stream[CAPTURE]->buffer = NULL;
308         substream->private_data = au1000->stream[CAPTURE];
309         substream->runtime->hw = snd_au1000_hw;
310         return (snd_pcm_hw_constraint_list(substream->runtime, 0,
311                 SNDRV_PCM_HW_PARAM_RATE, &hw_constraints_rates) < 0);
312 }
313 
314 static int
315 snd_au1000_playback_close(struct snd_pcm_substream *substream)
316 {
317         struct snd_au1000 *au1000 = substream->pcm->private_data;
318 
319         au1000->stream[PLAYBACK]->substream = NULL;
320         return 0;
321 }
322 
323 static int
324 snd_au1000_capture_close(struct snd_pcm_substream *substream)
325 {
326         struct snd_au1000 *au1000 = substream->pcm->private_data;
327 
328         au1000->stream[CAPTURE]->substream = NULL;
329         return 0;
330 }
331 
332 static int
333 snd_au1000_hw_params(struct snd_pcm_substream *substream,
334                                         struct snd_pcm_hw_params *hw_params)
335 {
336         struct audio_stream *stream = substream->private_data;
337         int err;
338 
339         err = snd_pcm_lib_malloc_pages(substream,
340                                        params_buffer_bytes(hw_params));
341         if (err < 0)
342                 return err;
343         return au1000_setup_dma_link(stream,
344                                      params_period_bytes(hw_params),
345                                      params_periods(hw_params));
346 }
347 
348 static int
349 snd_au1000_hw_free(struct snd_pcm_substream *substream)
350 {
351         struct audio_stream *stream = substream->private_data;
352         au1000_release_dma_link(stream);
353         return snd_pcm_lib_free_pages(substream);
354 }
355 
356 static int
357 snd_au1000_playback_prepare(struct snd_pcm_substream *substream)
358 {
359         struct snd_au1000 *au1000 = substream->pcm->private_data;
360         struct snd_pcm_runtime *runtime = substream->runtime;
361 
362         if (runtime->channels == 1)
363                 au1000_set_ac97_xmit_slots(au1000, AC97_SLOT_4);
364         else
365                 au1000_set_ac97_xmit_slots(au1000, AC97_SLOT_3 | AC97_SLOT_4);
366         snd_ac97_set_rate(au1000->ac97, AC97_PCM_FRONT_DAC_RATE, runtime->rate);
367         return 0;
368 }
369 
370 static int
371 snd_au1000_capture_prepare(struct snd_pcm_substream *substream)
372 {
373         struct snd_au1000 *au1000 = substream->pcm->private_data;
374         struct snd_pcm_runtime *runtime = substream->runtime;
375 
376         if (runtime->channels == 1)
377                 au1000_set_ac97_recv_slots(au1000, AC97_SLOT_4);
378         else
379                 au1000_set_ac97_recv_slots(au1000, AC97_SLOT_3 | AC97_SLOT_4);
380         snd_ac97_set_rate(au1000->ac97, AC97_PCM_LR_ADC_RATE, runtime->rate);
381         return 0;
382 }
383 
384 static int
385 snd_au1000_trigger(struct snd_pcm_substream *substream, int cmd)
386 {
387         struct audio_stream *stream = substream->private_data;
388         int err = 0;
389 
390         spin_lock(&stream->dma_lock);
391         switch (cmd) {
392         case SNDRV_PCM_TRIGGER_START:
393                 au1000_dma_start(stream);
394                 break;
395         case SNDRV_PCM_TRIGGER_STOP:
396                 au1000_dma_stop(stream);
397                 break;
398         default:
399                 err = -EINVAL;
400                 break;
401         }
402         spin_unlock(&stream->dma_lock);
403         return err;
404 }
405 
406 static snd_pcm_uframes_t
407 snd_au1000_pointer(struct snd_pcm_substream *substream)
408 {
409         struct audio_stream *stream = substream->private_data;
410         struct snd_pcm_runtime *runtime = substream->runtime;
411         long location;
412 
413         spin_lock(&stream->dma_lock);
414         location = get_dma_residue(stream->dma);
415         spin_unlock(&stream->dma_lock);
416         location = stream->buffer->relative_end - location;
417         if (location == -1)
418                 location = 0;
419         return bytes_to_frames(runtime,location);
420 }
421 
422 static struct snd_pcm_ops snd_card_au1000_playback_ops = {
423         .open                   = snd_au1000_playback_open,
424         .close                  = snd_au1000_playback_close,
425         .ioctl                  = snd_pcm_lib_ioctl,
426         .hw_params              = snd_au1000_hw_params,
427         .hw_free                = snd_au1000_hw_free,
428         .prepare                = snd_au1000_playback_prepare,
429         .trigger                = snd_au1000_trigger,
430         .pointer                = snd_au1000_pointer,
431 };
432 
433 static struct snd_pcm_ops snd_card_au1000_capture_ops = {
434         .open                   = snd_au1000_capture_open,
435         .close                  = snd_au1000_capture_close,
436         .ioctl                  = snd_pcm_lib_ioctl,
437         .hw_params              = snd_au1000_hw_params,
438         .hw_free                = snd_au1000_hw_free,
439         .prepare                = snd_au1000_capture_prepare,
440         .trigger                = snd_au1000_trigger,
441         .pointer                = snd_au1000_pointer,
442 };
443 
444 static int
445 snd_au1000_pcm_new(struct snd_au1000 *au1000)
446 {
447         struct snd_pcm *pcm;
448         int err;
449         unsigned long flags;
450 
451         if ((err = snd_pcm_new(au1000->card, "AU1000 AC97 PCM", 0, 1, 1, &pcm)) < 0)
452                 return err;
453 
454         snd_pcm_lib_preallocate_pages_for_all(pcm, SNDRV_DMA_TYPE_CONTINUOUS,
455                 snd_dma_continuous_data(GFP_KERNEL), 128*1024, 128*1024);
456 
457         snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_PLAYBACK,
458                 &snd_card_au1000_playback_ops);
459         snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_CAPTURE,
460                 &snd_card_au1000_capture_ops);
461 
462         pcm->private_data = au1000;
463         pcm->info_flags = 0;
464         strcpy(pcm->name, "Au1000 AC97 PCM");
465 
466         spin_lock_init(&au1000->stream[PLAYBACK]->dma_lock);
467         spin_lock_init(&au1000->stream[CAPTURE]->dma_lock);
468 
469         flags = claim_dma_lock();
470         au1000->stream[PLAYBACK]->dma = request_au1000_dma(au1000->dmaid[0],
471                         "AC97 TX", au1000_dma_interrupt, 0,
472                         au1000->stream[PLAYBACK]);
473         if (au1000->stream[PLAYBACK]->dma < 0) {
474                 release_dma_lock(flags);
475                 return -EBUSY;
476         }
477         au1000->stream[CAPTURE]->dma = request_au1000_dma(au1000->dmaid[1],
478                         "AC97 RX", au1000_dma_interrupt, 0,
479                         au1000->stream[CAPTURE]);
480         if (au1000->stream[CAPTURE]->dma < 0){
481                 release_dma_lock(flags);
482                 return -EBUSY;
483         }
484         /* enable DMA coherency in read/write DMA channels */
485         set_dma_mode(au1000->stream[PLAYBACK]->dma,
486                      get_dma_mode(au1000->stream[PLAYBACK]->dma) & ~DMA_NC);
487         set_dma_mode(au1000->stream[CAPTURE]->dma,
488                      get_dma_mode(au1000->stream[CAPTURE]->dma) & ~DMA_NC);
489         release_dma_lock(flags);
490         au1000->pcm = pcm;
491         return 0;
492 }
493 
494 
495 /*-------------------------- AC97 CODEC Control ------------------------------*/
496 
497 static unsigned short
498 snd_au1000_ac97_read(struct snd_ac97 *ac97, unsigned short reg)
499 {
500         struct snd_au1000 *au1000 = ac97->private_data;
501         u32 volatile cmd;
502         u16 volatile data;
503         int             i;
504 
505         spin_lock(&au1000->ac97_lock);
506 /* would rather use the interrupt than this polling but it works and I can't
507 get the interrupt driven case to work efficiently */
508         for (i = 0; i < 0x5000; i++)
509                 if (!(au1000->ac97_ioport->status & AC97C_CP))
510                         break;
511         if (i == 0x5000)
512                 printk(KERN_ERR "au1000 AC97: AC97 command read timeout\n");
513 
514         cmd = (u32) reg & AC97C_INDEX_MASK;
515         cmd |= AC97C_READ;
516         au1000->ac97_ioport->cmd = cmd;
517 
518         /* now wait for the data */
519         for (i = 0; i < 0x5000; i++)
520                 if (!(au1000->ac97_ioport->status & AC97C_CP))
521                         break;
522         if (i == 0x5000) {
523                 printk(KERN_ERR "au1000 AC97: AC97 command read timeout\n");
524                 spin_unlock(&au1000->ac97_lock);
525                 return 0;
526         }
527 
528         data = au1000->ac97_ioport->cmd & 0xffff;
529         spin_unlock(&au1000->ac97_lock);
530 
531         return data;
532 
533 }
534 
535 
536 static void
537 snd_au1000_ac97_write(struct snd_ac97 *ac97, unsigned short reg, unsigned short val)
538 {
539         struct snd_au1000 *au1000 = ac97->private_data;
540         u32 cmd;
541         int i;
542 
543         spin_lock(&au1000->ac97_lock);
544 /* would rather use the interrupt than this polling but it works and I can't
545 get the interrupt driven case to work efficiently */
546         for (i = 0; i < 0x5000; i++)
547                 if (!(au1000->ac97_ioport->status & AC97C_CP))
548                         break;
549         if (i == 0x5000)
550                 printk(KERN_ERR "au1000 AC97: AC97 command write timeout\n");
551 
552         cmd = (u32) reg & AC97C_INDEX_MASK;
553         cmd &= ~AC97C_READ;
554         cmd |= ((u32) val << AC97C_WD_BIT);
555         au1000->ac97_ioport->cmd = cmd;
556         spin_unlock(&au1000->ac97_lock);
557 }
558 
559 /*------------------------------ Setup / Destroy ----------------------------*/
560 
561 static void snd_au1000_free(struct snd_card *card)
562 {
563         struct snd_au1000 *au1000 = card->private_data;
564 
565         if (au1000->stream[PLAYBACK]) {
566                 if (au1000->stream[PLAYBACK]->dma >= 0)
567                         free_au1000_dma(au1000->stream[PLAYBACK]->dma);
568                 kfree(au1000->stream[PLAYBACK]);
569         }
570 
571         if (au1000->stream[CAPTURE]) {
572                 if (au1000->stream[CAPTURE]->dma >= 0)
573                         free_au1000_dma(au1000->stream[CAPTURE]->dma);
574                 kfree(au1000->stream[CAPTURE]);
575         }
576 
577         if (au1000->ac97_res_port) {
578                 /* put internal AC97 block into reset */
579                 if (au1000->ac97_ioport) {
580                         au1000->ac97_ioport->cntrl = AC97C_RS;
581                         iounmap(au1000->ac97_ioport);
582                         au1000->ac97_ioport = NULL;
583                 }
584                 release_and_free_resource(au1000->ac97_res_port);
585                 au1000->ac97_res_port = NULL;
586         }
587 }
588 
589 static struct snd_ac97_bus_ops ops = {
590         .write  = snd_au1000_ac97_write,
591         .read   = snd_au1000_ac97_read,
592 };
593 
594 static int au1000_ac97_probe(struct platform_device *pdev)
595 {
596         int err;
597         void __iomem *io;
598         struct resource *r;
599         struct snd_card *card;
600         struct snd_au1000 *au1000;
601         struct snd_ac97_bus *pbus;
602         struct snd_ac97_template ac97;
603 
604         err = snd_card_new(&pdev->dev, -1, "AC97", THIS_MODULE,
605                            sizeof(struct snd_au1000), &card);
606         if (err < 0)
607                 return err;
608 
609         au1000 = card->private_data;
610         au1000->card = card;
611         spin_lock_init(&au1000->ac97_lock);
612 
613         /* from here on let ALSA call the special freeing function */
614         card->private_free = snd_au1000_free;
615 
616         /* TX DMA ID */
617         r = platform_get_resource(pdev, IORESOURCE_DMA, 0);
618         if (!r) {
619                 err = -ENODEV;
620                 snd_printk(KERN_INFO "no TX DMA platform resource!\n");
621                 goto out;
622         }
623         au1000->dmaid[0] = r->start;
624 
625         /* RX DMA ID */
626         r = platform_get_resource(pdev, IORESOURCE_DMA, 1);
627         if (!r) {
628                 err = -ENODEV;
629                 snd_printk(KERN_INFO "no RX DMA platform resource!\n");
630                 goto out;
631         }
632         au1000->dmaid[1] = r->start;
633 
634         au1000->stream[PLAYBACK] = kmalloc(sizeof(struct audio_stream),
635                                            GFP_KERNEL);
636         if (!au1000->stream[PLAYBACK])
637                 goto out;
638         au1000->stream[PLAYBACK]->dma = -1;
639 
640         au1000->stream[CAPTURE] = kmalloc(sizeof(struct audio_stream),
641                                           GFP_KERNEL);
642         if (!au1000->stream[CAPTURE])
643                 goto out;
644         au1000->stream[CAPTURE]->dma = -1;
645 
646         r = platform_get_resource(pdev, IORESOURCE_MEM, 0);
647         if (!r)
648                 goto out;
649 
650         err = -EBUSY;
651         au1000->ac97_res_port = request_mem_region(r->start, resource_size(r),
652                                                    pdev->name);
653         if (!au1000->ac97_res_port) {
654                 snd_printk(KERN_ERR "ALSA AC97: can't grab AC97 port\n");
655                 goto out;
656         }
657 
658         io = ioremap(r->start, resource_size(r));
659         if (!io)
660                 goto out;
661 
662         au1000->ac97_ioport = (struct au1000_ac97_reg *)io;
663 
664         /* configure pins for AC'97
665         TODO: move to board_setup.c */
666         au_writel(au_readl(SYS_PINFUNC) & ~0x02, SYS_PINFUNC);
667 
668         /* Initialise Au1000's AC'97 Control Block */
669         au1000->ac97_ioport->cntrl = AC97C_RS | AC97C_CE;
670         udelay(10);
671         au1000->ac97_ioport->cntrl = AC97C_CE;
672         udelay(10);
673 
674         /* Initialise External CODEC -- cold reset */
675         au1000->ac97_ioport->config = AC97C_RESET;
676         udelay(10);
677         au1000->ac97_ioport->config = 0x0;
678         mdelay(5);
679 
680         /* Initialise AC97 middle-layer */
681         err = snd_ac97_bus(au1000->card, 0, &ops, au1000, &pbus);
682         if (err < 0)
683                 goto out;
684 
685         memset(&ac97, 0, sizeof(ac97));
686         ac97.private_data = au1000;
687         err = snd_ac97_mixer(pbus, &ac97, &au1000->ac97);
688         if (err < 0)
689                 goto out;
690 
691         err = snd_au1000_pcm_new(au1000);
692         if (err < 0)
693                 goto out;
694 
695         strcpy(card->driver, "Au1000-AC97");
696         strcpy(card->shortname, "AMD Au1000-AC97");
697         sprintf(card->longname, "AMD Au1000--AC97 ALSA Driver");
698 
699         err = snd_card_register(card);
700         if (err < 0)
701                 goto out;
702 
703         printk(KERN_INFO "ALSA AC97: Driver Initialized\n");
704 
705         platform_set_drvdata(pdev, card);
706 
707         return 0;
708 
709  out:
710         snd_card_free(card);
711         return err;
712 }
713 
714 static int au1000_ac97_remove(struct platform_device *pdev)
715 {
716         return snd_card_free(platform_get_drvdata(pdev));
717 }
718 
719 struct platform_driver au1000_ac97c_driver = {
720         .driver = {
721                 .name   = "au1000-ac97c",
722                 .owner  = THIS_MODULE,
723         },
724         .probe          = au1000_ac97_probe,
725         .remove         = au1000_ac97_remove,
726 };
727 
728 module_platform_driver(au1000_ac97c_driver);
729 

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