[ALSA] AMD Au1x00: AC'97 controller is memory mapped
[linux-2.6.git] / 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 <sound/driver.h>
40 #include <linux/init.h>
41 #include <linux/slab.h>
42 #include <linux/version.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 };
103
104 /*--------------------------- Local Functions --------------------------------*/
105 static void
106 au1000_set_ac97_xmit_slots(struct snd_au1000 *au1000, long xmit_slots)
107 {
108         u32 volatile ac97_config;
109
110         spin_lock(&au1000->ac97_lock);
111         ac97_config = au1000->ac97_ioport->config;
112         ac97_config = ac97_config & ~AC97C_XMIT_SLOTS_MASK;
113         ac97_config |= (xmit_slots << AC97C_XMIT_SLOTS_BIT);
114         au1000->ac97_ioport->config = ac97_config;
115         spin_unlock(&au1000->ac97_lock);
116 }
117
118 static void
119 au1000_set_ac97_recv_slots(struct snd_au1000 *au1000, long recv_slots)
120 {
121         u32 volatile ac97_config;
122
123         spin_lock(&au1000->ac97_lock);
124         ac97_config = au1000->ac97_ioport->config;
125         ac97_config = ac97_config & ~AC97C_RECV_SLOTS_MASK;
126         ac97_config |= (recv_slots << AC97C_RECV_SLOTS_BIT);
127         au1000->ac97_ioport->config = ac97_config;
128         spin_unlock(&au1000->ac97_lock);
129 }
130
131
132 static void
133 au1000_release_dma_link(struct audio_stream *stream)
134 {
135         struct au1000_period * pointer;
136         struct au1000_period * pointer_next;
137
138         stream->period_size = 0;
139         stream->periods = 0;
140         pointer = stream->buffer;
141         if (! pointer)
142                 return;
143         do {
144                 pointer_next = pointer->next;
145                 kfree(pointer);
146                 pointer = pointer_next;
147         } while (pointer != stream->buffer);
148         stream->buffer = NULL;
149 }
150
151 static int
152 au1000_setup_dma_link(struct audio_stream *stream, unsigned int period_bytes,
153                       unsigned int periods)
154 {
155         struct snd_pcm_substream *substream = stream->substream;
156         struct snd_pcm_runtime *runtime = substream->runtime;
157         struct au1000_period *pointer;
158         unsigned long dma_start;
159         int i;
160
161         dma_start = virt_to_phys(runtime->dma_area);
162
163         if (stream->period_size == period_bytes &&
164             stream->periods == periods)
165                 return 0; /* not changed */
166
167         au1000_release_dma_link(stream);
168
169         stream->period_size = period_bytes;
170         stream->periods = periods;
171
172         stream->buffer = kmalloc(sizeof(struct au1000_period), GFP_KERNEL);
173         if (! stream->buffer)
174                 return -ENOMEM;
175         pointer = stream->buffer;
176         for (i = 0; i < periods; i++) {
177                 pointer->start = (u32)(dma_start + (i * period_bytes));
178                 pointer->relative_end = (u32) (((i+1) * period_bytes) - 0x1);
179                 if (i < periods - 1) {
180                         pointer->next = kmalloc(sizeof(struct au1000_period), GFP_KERNEL);
181                         if (! pointer->next) {
182                                 au1000_release_dma_link(stream);
183                                 return -ENOMEM;
184                         }
185                         pointer = pointer->next;
186                 }
187         }
188         pointer->next = stream->buffer;
189         return 0;
190 }
191
192 static void
193 au1000_dma_stop(struct audio_stream *stream)
194 {
195         snd_assert(stream->buffer, return);
196         disable_dma(stream->dma);
197 }
198
199 static void
200 au1000_dma_start(struct audio_stream *stream)
201 {
202         snd_assert(stream->buffer, return);
203
204         init_dma(stream->dma);
205         if (get_dma_active_buffer(stream->dma) == 0) {
206                 clear_dma_done0(stream->dma);
207                 set_dma_addr0(stream->dma, stream->buffer->start);
208                 set_dma_count0(stream->dma, stream->period_size >> 1);
209                 set_dma_addr1(stream->dma, stream->buffer->next->start);
210                 set_dma_count1(stream->dma, stream->period_size >> 1);
211         } else {
212                 clear_dma_done1(stream->dma);
213                 set_dma_addr1(stream->dma, stream->buffer->start);
214                 set_dma_count1(stream->dma, stream->period_size >> 1);
215                 set_dma_addr0(stream->dma, stream->buffer->next->start);
216                 set_dma_count0(stream->dma, stream->period_size >> 1);
217         }
218         enable_dma_buffers(stream->dma);
219         start_dma(stream->dma);
220 }
221
222 static irqreturn_t
223 au1000_dma_interrupt(int irq, void *dev_id, struct pt_regs *regs)
224 {
225         struct audio_stream *stream = (struct audio_stream *) dev_id;
226         struct snd_pcm_substream *substream = stream->substream;
227
228         spin_lock(&stream->dma_lock);
229         switch (get_dma_buffer_done(stream->dma)) {
230         case DMA_D0:
231                 stream->buffer = stream->buffer->next;
232                 clear_dma_done0(stream->dma);
233                 set_dma_addr0(stream->dma, stream->buffer->next->start);
234                 set_dma_count0(stream->dma, stream->period_size >> 1);
235                 enable_dma_buffer0(stream->dma);
236                 break;
237         case DMA_D1:
238                 stream->buffer = stream->buffer->next;
239                 clear_dma_done1(stream->dma);
240                 set_dma_addr1(stream->dma, stream->buffer->next->start);
241                 set_dma_count1(stream->dma, stream->period_size >> 1);
242                 enable_dma_buffer1(stream->dma);
243                 break;
244         case (DMA_D0 | DMA_D1):
245                 printk(KERN_ERR "DMA %d missed interrupt.\n",stream->dma);
246                 au1000_dma_stop(stream);
247                 au1000_dma_start(stream);
248                 break;
249         case (~DMA_D0 & ~DMA_D1):
250                 printk(KERN_ERR "DMA %d empty irq.\n",stream->dma);
251         }
252         spin_unlock(&stream->dma_lock);
253         snd_pcm_period_elapsed(substream);
254         return IRQ_HANDLED;
255 }
256
257 /*-------------------------- PCM Audio Streams -------------------------------*/
258
259 static unsigned int rates[] = {8000, 11025, 16000, 22050};
260 static struct snd_pcm_hw_constraint_list hw_constraints_rates = {
261         .count  =  sizeof(rates) / sizeof(rates[0]),
262         .list   = rates,
263         .mask   = 0,
264 };
265
266 static struct snd_pcm_hardware snd_au1000_hw =
267 {
268         .info                   = (SNDRV_PCM_INFO_INTERLEAVED | \
269                                 SNDRV_PCM_INFO_MMAP | SNDRV_PCM_INFO_MMAP_VALID),
270         .formats                = SNDRV_PCM_FMTBIT_S16_LE,
271         .rates                  = (SNDRV_PCM_RATE_8000 | SNDRV_PCM_RATE_11025 |
272                                 SNDRV_PCM_RATE_16000 | SNDRV_PCM_RATE_22050),
273         .rate_min               = 8000,
274         .rate_max               = 22050,
275         .channels_min           = 1,
276         .channels_max           = 2,
277         .buffer_bytes_max       = 128*1024,
278         .period_bytes_min       = 32,
279         .period_bytes_max       = 16*1024,
280         .periods_min            = 8,
281         .periods_max            = 255,
282         .fifo_size              = 16,
283 };
284
285 static int
286 snd_au1000_playback_open(struct snd_pcm_substream *substream)
287 {
288         struct snd_au1000 *au1000 = substream->pcm->private_data;
289
290         au1000->stream[PLAYBACK]->substream = substream;
291         au1000->stream[PLAYBACK]->buffer = NULL;
292         substream->private_data = au1000->stream[PLAYBACK];
293         substream->runtime->hw = snd_au1000_hw;
294         return (snd_pcm_hw_constraint_list(substream->runtime, 0,
295                 SNDRV_PCM_HW_PARAM_RATE, &hw_constraints_rates) < 0);
296 }
297
298 static int
299 snd_au1000_capture_open(struct snd_pcm_substream *substream)
300 {
301         struct snd_au1000 *au1000 = substream->pcm->private_data;
302
303         au1000->stream[CAPTURE]->substream = substream;
304         au1000->stream[CAPTURE]->buffer = NULL;
305         substream->private_data = au1000->stream[CAPTURE];
306         substream->runtime->hw = snd_au1000_hw;
307         return (snd_pcm_hw_constraint_list(substream->runtime, 0,
308                 SNDRV_PCM_HW_PARAM_RATE, &hw_constraints_rates) < 0);
309 }
310
311 static int
312 snd_au1000_playback_close(struct snd_pcm_substream *substream)
313 {
314         struct snd_au1000 *au1000 = substream->pcm->private_data;
315
316         au1000->stream[PLAYBACK]->substream = NULL;
317         return 0;
318 }
319
320 static int
321 snd_au1000_capture_close(struct snd_pcm_substream *substream)
322 {
323         struct snd_au1000 *au1000 = substream->pcm->private_data;
324
325         au1000->stream[CAPTURE]->substream = NULL;
326         return 0;
327 }
328
329 static int
330 snd_au1000_hw_params(struct snd_pcm_substream *substream,
331                                         struct snd_pcm_hw_params *hw_params)
332 {
333         struct audio_stream *stream = substream->private_data;
334         int err;
335
336         err = snd_pcm_lib_malloc_pages(substream,
337                                        params_buffer_bytes(hw_params));
338         if (err < 0)
339                 return err;
340         return au1000_setup_dma_link(stream,
341                                      params_period_bytes(hw_params),
342                                      params_periods(hw_params));
343 }
344
345 static int
346 snd_au1000_hw_free(struct snd_pcm_substream *substream)
347 {
348         struct audio_stream *stream = substream->private_data;
349         au1000_release_dma_link(stream);
350         return snd_pcm_lib_free_pages(substream);
351 }
352
353 static int
354 snd_au1000_playback_prepare(struct snd_pcm_substream *substream)
355 {
356         struct snd_au1000 *au1000 = substream->pcm->private_data;
357         struct snd_pcm_runtime *runtime = substream->runtime;
358
359         if (runtime->channels == 1)
360                 au1000_set_ac97_xmit_slots(au1000, AC97_SLOT_4);
361         else
362                 au1000_set_ac97_xmit_slots(au1000, AC97_SLOT_3 | AC97_SLOT_4);
363         snd_ac97_set_rate(au1000->ac97, AC97_PCM_FRONT_DAC_RATE, runtime->rate);
364         return 0;
365 }
366
367 static int
368 snd_au1000_capture_prepare(struct snd_pcm_substream *substream)
369 {
370         struct snd_au1000 *au1000 = substream->pcm->private_data;
371         struct snd_pcm_runtime *runtime = substream->runtime;
372
373         if (runtime->channels == 1)
374                 au1000_set_ac97_recv_slots(au1000, AC97_SLOT_4);
375         else
376                 au1000_set_ac97_recv_slots(au1000, AC97_SLOT_3 | AC97_SLOT_4);
377         snd_ac97_set_rate(au1000->ac97, AC97_PCM_LR_ADC_RATE, runtime->rate);
378         return 0;
379 }
380
381 static int
382 snd_au1000_trigger(struct snd_pcm_substream *substream, int cmd)
383 {
384         struct audio_stream *stream = substream->private_data;
385         int err = 0;
386
387         spin_lock(&stream->dma_lock);
388         switch (cmd) {
389         case SNDRV_PCM_TRIGGER_START:
390                 au1000_dma_start(stream);
391                 break;
392         case SNDRV_PCM_TRIGGER_STOP:
393                 au1000_dma_stop(stream);
394                 break;
395         default:
396                 err = -EINVAL;
397                 break;
398         }
399         spin_unlock(&stream->dma_lock);
400         return err;
401 }
402
403 static snd_pcm_uframes_t
404 snd_au1000_pointer(struct snd_pcm_substream *substream)
405 {
406         struct audio_stream *stream = substream->private_data;
407         struct snd_pcm_runtime *runtime = substream->runtime;
408         long location;
409
410         spin_lock(&stream->dma_lock);
411         location = get_dma_residue(stream->dma);
412         spin_unlock(&stream->dma_lock);
413         location = stream->buffer->relative_end - location;
414         if (location == -1)
415                 location = 0;
416         return bytes_to_frames(runtime,location);
417 }
418
419 static struct snd_pcm_ops snd_card_au1000_playback_ops = {
420         .open                   = snd_au1000_playback_open,
421         .close                  = snd_au1000_playback_close,
422         .ioctl                  = snd_pcm_lib_ioctl,
423         .hw_params              = snd_au1000_hw_params,
424         .hw_free                = snd_au1000_hw_free,
425         .prepare                = snd_au1000_playback_prepare,
426         .trigger                = snd_au1000_trigger,
427         .pointer                = snd_au1000_pointer,
428 };
429
430 static struct snd_pcm_ops snd_card_au1000_capture_ops = {
431         .open                   = snd_au1000_capture_open,
432         .close                  = snd_au1000_capture_close,
433         .ioctl                  = snd_pcm_lib_ioctl,
434         .hw_params              = snd_au1000_hw_params,
435         .hw_free                = snd_au1000_hw_free,
436         .prepare                = snd_au1000_capture_prepare,
437         .trigger                = snd_au1000_trigger,
438         .pointer                = snd_au1000_pointer,
439 };
440
441 static int __devinit
442 snd_au1000_pcm_new(struct snd_au1000 *au1000)
443 {
444         struct snd_pcm *pcm;
445         int err;
446         unsigned long flags;
447
448         if ((err = snd_pcm_new(au1000->card, "AU1000 AC97 PCM", 0, 1, 1, &pcm)) < 0)
449                 return err;
450
451         snd_pcm_lib_preallocate_pages_for_all(pcm, SNDRV_DMA_TYPE_CONTINUOUS,
452                 snd_dma_continuous_data(GFP_KERNEL), 128*1024, 128*1024);
453
454         snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_PLAYBACK,
455                 &snd_card_au1000_playback_ops);
456         snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_CAPTURE,
457                 &snd_card_au1000_capture_ops);
458
459         pcm->private_data = au1000;
460         pcm->info_flags = 0;
461         strcpy(pcm->name, "Au1000 AC97 PCM");
462
463         spin_lock_init(&au1000->stream[PLAYBACK]->dma_lock);
464         spin_lock_init(&au1000->stream[CAPTURE]->dma_lock);
465
466         flags = claim_dma_lock();
467         if ((au1000->stream[PLAYBACK]->dma = request_au1000_dma(DMA_ID_AC97C_TX,
468                         "AC97 TX", au1000_dma_interrupt, SA_INTERRUPT,
469                         au1000->stream[PLAYBACK])) < 0) {
470                 release_dma_lock(flags);
471                 return -EBUSY;
472         }
473         if ((au1000->stream[CAPTURE]->dma = request_au1000_dma(DMA_ID_AC97C_RX,
474                         "AC97 RX", au1000_dma_interrupt, SA_INTERRUPT,
475                         au1000->stream[CAPTURE])) < 0){
476                 release_dma_lock(flags);
477                 return -EBUSY;
478         }
479         /* enable DMA coherency in read/write DMA channels */
480         set_dma_mode(au1000->stream[PLAYBACK]->dma,
481                      get_dma_mode(au1000->stream[PLAYBACK]->dma) & ~DMA_NC);
482         set_dma_mode(au1000->stream[CAPTURE]->dma,
483                      get_dma_mode(au1000->stream[CAPTURE]->dma) & ~DMA_NC);
484         release_dma_lock(flags);
485         au1000->pcm = pcm;
486         return 0;
487 }
488
489
490 /*-------------------------- AC97 CODEC Control ------------------------------*/
491
492 static unsigned short
493 snd_au1000_ac97_read(struct snd_ac97 *ac97, unsigned short reg)
494 {
495         struct snd_au1000 *au1000 = ac97->private_data;
496         u32 volatile cmd;
497         u16 volatile data;
498         int             i;
499
500         spin_lock(&au1000->ac97_lock);
501 /* would rather use the interupt than this polling but it works and I can't
502 get the interupt driven case to work efficiently */
503         for (i = 0; i < 0x5000; i++)
504                 if (!(au1000->ac97_ioport->status & AC97C_CP))
505                         break;
506         if (i == 0x5000)
507                 printk(KERN_ERR "au1000 AC97: AC97 command read timeout\n");
508
509         cmd = (u32) reg & AC97C_INDEX_MASK;
510         cmd |= AC97C_READ;
511         au1000->ac97_ioport->cmd = cmd;
512
513         /* now wait for the data */
514         for (i = 0; i < 0x5000; i++)
515                 if (!(au1000->ac97_ioport->status & AC97C_CP))
516                         break;
517         if (i == 0x5000) {
518                 printk(KERN_ERR "au1000 AC97: AC97 command read timeout\n");
519                 return 0;
520         }
521
522         data = au1000->ac97_ioport->cmd & 0xffff;
523         spin_unlock(&au1000->ac97_lock);
524
525         return data;
526
527 }
528
529
530 static void
531 snd_au1000_ac97_write(struct snd_ac97 *ac97, unsigned short reg, unsigned short val)
532 {
533         struct snd_au1000 *au1000 = ac97->private_data;
534         u32 cmd;
535         int i;
536
537         spin_lock(&au1000->ac97_lock);
538 /* would rather use the interupt than this polling but it works and I can't
539 get the interupt driven case to work efficiently */
540         for (i = 0; i < 0x5000; i++)
541                 if (!(au1000->ac97_ioport->status & AC97C_CP))
542                         break;
543         if (i == 0x5000)
544                 printk(KERN_ERR "au1000 AC97: AC97 command write timeout\n");
545
546         cmd = (u32) reg & AC97C_INDEX_MASK;
547         cmd &= ~AC97C_READ;
548         cmd |= ((u32) val << AC97C_WD_BIT);
549         au1000->ac97_ioport->cmd = cmd;
550         spin_unlock(&au1000->ac97_lock);
551 }
552
553 static int __devinit
554 snd_au1000_ac97_new(struct snd_au1000 *au1000)
555 {
556         int err;
557         struct snd_ac97_bus *pbus;
558         struct snd_ac97_template ac97;
559         static struct snd_ac97_bus_ops ops = {
560                 .write = snd_au1000_ac97_write,
561                 .read = snd_au1000_ac97_read,
562         };
563
564         if ((au1000->ac97_res_port = request_mem_region(CPHYSADDR(AC97C_CONFIG),
565                         0x100000, "Au1x00 AC97")) == NULL) {
566                 snd_printk(KERN_ERR "ALSA AC97: can't grap AC97 port\n");
567                 return -EBUSY;
568         }
569         au1000->ac97_ioport = (struct au1000_ac97_reg *)
570                 KSEG1ADDR(au1000->ac97_res_port->start);
571
572         spin_lock_init(&au1000->ac97_lock);
573
574         /* configure pins for AC'97
575         TODO: move to board_setup.c */
576         au_writel(au_readl(SYS_PINFUNC) & ~0x02, SYS_PINFUNC);
577
578         /* Initialise Au1000's AC'97 Control Block */
579         au1000->ac97_ioport->cntrl = AC97C_RS | AC97C_CE;
580         udelay(10);
581         au1000->ac97_ioport->cntrl = AC97C_CE;
582         udelay(10);
583
584         /* Initialise External CODEC -- cold reset */
585         au1000->ac97_ioport->config = AC97C_RESET;
586         udelay(10);
587         au1000->ac97_ioport->config = 0x0;
588         mdelay(5);
589
590         /* Initialise AC97 middle-layer */
591         if ((err = snd_ac97_bus(au1000->card, 0, &ops, au1000, &pbus)) < 0)
592                 return err;
593
594         memset(&ac97, 0, sizeof(ac97));
595         ac97.private_data = au1000;
596         if ((err = snd_ac97_mixer(pbus, &ac97, &au1000->ac97)) < 0)
597                 return err;
598
599         return 0;
600 }
601
602 /*------------------------------ Setup / Destroy ----------------------------*/
603
604 void
605 snd_au1000_free(struct snd_card *card)
606 {
607         struct snd_au1000 *au1000 = card->private_data;
608
609         if (au1000->ac97_res_port) {
610                 /* put internal AC97 block into reset */
611                 au1000->ac97_ioport->cntrl = AC97C_RS;
612                 au1000->ac97_ioport = NULL;
613                 release_and_free_resource(au1000->ac97_res_port);
614         }
615
616         if (au1000->stream[PLAYBACK]) {
617                 if (au1000->stream[PLAYBACK]->dma >= 0)
618                         free_au1000_dma(au1000->stream[PLAYBACK]->dma);
619                 kfree(au1000->stream[PLAYBACK]);
620         }
621
622         if (au1000->stream[CAPTURE]) {
623                 if (au1000->stream[CAPTURE]->dma >= 0)
624                         free_au1000_dma(au1000->stream[CAPTURE]->dma);
625                 kfree(au1000->stream[CAPTURE]);
626         }
627 }
628
629
630 static struct snd_card *au1000_card;
631
632 static int __init
633 au1000_init(void)
634 {
635         int err;
636         struct snd_card *card;
637         struct snd_au1000 *au1000;
638
639         card = snd_card_new(-1, "AC97", THIS_MODULE, sizeof(struct snd_au1000));
640         if (card == NULL)
641                 return -ENOMEM;
642
643         card->private_free = snd_au1000_free;
644         au1000 = card->private_data;
645         au1000->card = card;
646
647         au1000->stream[PLAYBACK] = kmalloc(sizeof(struct audio_stream), GFP_KERNEL);
648         au1000->stream[CAPTURE ] = kmalloc(sizeof(struct audio_stream), GFP_KERNEL);
649         /* so that snd_au1000_free will work as intended */
650         au1000->ac97_res_port = NULL;
651         if (au1000->stream[PLAYBACK])
652                 au1000->stream[PLAYBACK]->dma = -1;
653         if (au1000->stream[CAPTURE ])
654                 au1000->stream[CAPTURE ]->dma = -1;
655
656         if (au1000->stream[PLAYBACK] == NULL ||
657             au1000->stream[CAPTURE ] == NULL) {
658                 snd_card_free(card);
659                 return -ENOMEM;
660         }
661
662         if ((err = snd_au1000_ac97_new(au1000)) < 0 ) {
663                 snd_card_free(card);
664                 return err;
665         }
666
667         if ((err = snd_au1000_pcm_new(au1000)) < 0) {
668                 snd_card_free(card);
669                 return err;
670         }
671
672         strcpy(card->driver, "Au1000-AC97");
673         strcpy(card->shortname, "AMD Au1000-AC97");
674         sprintf(card->longname, "AMD Au1000--AC97 ALSA Driver");
675
676         if ((err = snd_card_register(card)) < 0) {
677                 snd_card_free(card);
678                 return err;
679         }
680
681         printk( KERN_INFO "ALSA AC97: Driver Initialized\n" );
682         au1000_card = card;
683         return 0;
684 }
685
686 static void __exit au1000_exit(void)
687 {
688         snd_card_free(au1000_card);
689 }
690
691 module_init(au1000_init);
692 module_exit(au1000_exit);
693