Version:  2.0.40 2.2.26 2.4.37 3.1 3.2 3.3 3.4 3.5 3.6 3.7 3.8 3.9 3.10 3.11 3.12 3.13 3.14 3.15 3.16 3.17

Linux/sound/mips/sgio2audio.c

  1 /*
  2  *   Sound driver for Silicon Graphics O2 Workstations A/V board audio.
  3  *
  4  *   Copyright 2003 Vivien Chappelier <vivien.chappelier@linux-mips.org>
  5  *   Copyright 2008 Thomas Bogendoerfer <tsbogend@alpha.franken.de>
  6  *   Mxier part taken from mace_audio.c:
  7  *   Copyright 2007 Thorben Jändling <tj.trevelyan@gmail.com>
  8  *
  9  *   This program is free software; you can redistribute it and/or modify
 10  *   it under the terms of the GNU General Public License as published by
 11  *   the Free Software Foundation; either version 2 of the License, or
 12  *   (at your option) any later version.
 13  *
 14  *   This program is distributed in the hope that it will be useful,
 15  *   but WITHOUT ANY WARRANTY; without even the implied warranty of
 16  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 17  *   GNU General Public License for more details.
 18  *
 19  *   You should have received a copy of the GNU General Public License
 20  *   along with this program; if not, write to the Free Software
 21  *   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
 22  *
 23  */
 24 
 25 #include <linux/init.h>
 26 #include <linux/delay.h>
 27 #include <linux/spinlock.h>
 28 #include <linux/interrupt.h>
 29 #include <linux/dma-mapping.h>
 30 #include <linux/platform_device.h>
 31 #include <linux/io.h>
 32 #include <linux/slab.h>
 33 #include <linux/module.h>
 34 
 35 #include <asm/ip32/ip32_ints.h>
 36 #include <asm/ip32/mace.h>
 37 
 38 #include <sound/core.h>
 39 #include <sound/control.h>
 40 #include <sound/pcm.h>
 41 #define SNDRV_GET_ID
 42 #include <sound/initval.h>
 43 #include <sound/ad1843.h>
 44 
 45 
 46 MODULE_AUTHOR("Vivien Chappelier <vivien.chappelier@linux-mips.org>");
 47 MODULE_DESCRIPTION("SGI O2 Audio");
 48 MODULE_LICENSE("GPL");
 49 MODULE_SUPPORTED_DEVICE("{{Silicon Graphics, O2 Audio}}");
 50 
 51 static int index = SNDRV_DEFAULT_IDX1;  /* Index 0-MAX */
 52 static char *id = SNDRV_DEFAULT_STR1;   /* ID for this card */
 53 
 54 module_param(index, int, 0444);
 55 MODULE_PARM_DESC(index, "Index value for SGI O2 soundcard.");
 56 module_param(id, charp, 0444);
 57 MODULE_PARM_DESC(id, "ID string for SGI O2 soundcard.");
 58 
 59 
 60 #define AUDIO_CONTROL_RESET              BIT(0) /* 1: reset audio interface */
 61 #define AUDIO_CONTROL_CODEC_PRESENT      BIT(1) /* 1: codec detected */
 62 
 63 #define CODEC_CONTROL_WORD_SHIFT        0
 64 #define CODEC_CONTROL_READ              BIT(16)
 65 #define CODEC_CONTROL_ADDRESS_SHIFT     17
 66 
 67 #define CHANNEL_CONTROL_RESET           BIT(10) /* 1: reset channel */
 68 #define CHANNEL_DMA_ENABLE              BIT(9)  /* 1: enable DMA transfer */
 69 #define CHANNEL_INT_THRESHOLD_DISABLED  (0 << 5) /* interrupt disabled */
 70 #define CHANNEL_INT_THRESHOLD_25        (1 << 5) /* int on buffer >25% full */
 71 #define CHANNEL_INT_THRESHOLD_50        (2 << 5) /* int on buffer >50% full */
 72 #define CHANNEL_INT_THRESHOLD_75        (3 << 5) /* int on buffer >75% full */
 73 #define CHANNEL_INT_THRESHOLD_EMPTY     (4 << 5) /* int on buffer empty */
 74 #define CHANNEL_INT_THRESHOLD_NOT_EMPTY (5 << 5) /* int on buffer !empty */
 75 #define CHANNEL_INT_THRESHOLD_FULL      (6 << 5) /* int on buffer empty */
 76 #define CHANNEL_INT_THRESHOLD_NOT_FULL  (7 << 5) /* int on buffer !empty */
 77 
 78 #define CHANNEL_RING_SHIFT              12
 79 #define CHANNEL_RING_SIZE               (1 << CHANNEL_RING_SHIFT)
 80 #define CHANNEL_RING_MASK               (CHANNEL_RING_SIZE - 1)
 81 
 82 #define CHANNEL_LEFT_SHIFT 40
 83 #define CHANNEL_RIGHT_SHIFT 8
 84 
 85 struct snd_sgio2audio_chan {
 86         int idx;
 87         struct snd_pcm_substream *substream;
 88         int pos;
 89         snd_pcm_uframes_t size;
 90         spinlock_t lock;
 91 };
 92 
 93 /* definition of the chip-specific record */
 94 struct snd_sgio2audio {
 95         struct snd_card *card;
 96 
 97         /* codec */
 98         struct snd_ad1843 ad1843;
 99         spinlock_t ad1843_lock;
100 
101         /* channels */
102         struct snd_sgio2audio_chan channel[3];
103 
104         /* resources */
105         void *ring_base;
106         dma_addr_t ring_base_dma;
107 };
108 
109 /* AD1843 access */
110 
111 /*
112  * read_ad1843_reg returns the current contents of a 16 bit AD1843 register.
113  *
114  * Returns unsigned register value on success, -errno on failure.
115  */
116 static int read_ad1843_reg(void *priv, int reg)
117 {
118         struct snd_sgio2audio *chip = priv;
119         int val;
120         unsigned long flags;
121 
122         spin_lock_irqsave(&chip->ad1843_lock, flags);
123 
124         writeq((reg << CODEC_CONTROL_ADDRESS_SHIFT) |
125                CODEC_CONTROL_READ, &mace->perif.audio.codec_control);
126         wmb();
127         val = readq(&mace->perif.audio.codec_control); /* flush bus */
128         udelay(200);
129 
130         val = readq(&mace->perif.audio.codec_read);
131 
132         spin_unlock_irqrestore(&chip->ad1843_lock, flags);
133         return val;
134 }
135 
136 /*
137  * write_ad1843_reg writes the specified value to a 16 bit AD1843 register.
138  */
139 static int write_ad1843_reg(void *priv, int reg, int word)
140 {
141         struct snd_sgio2audio *chip = priv;
142         int val;
143         unsigned long flags;
144 
145         spin_lock_irqsave(&chip->ad1843_lock, flags);
146 
147         writeq((reg << CODEC_CONTROL_ADDRESS_SHIFT) |
148                (word << CODEC_CONTROL_WORD_SHIFT),
149                &mace->perif.audio.codec_control);
150         wmb();
151         val = readq(&mace->perif.audio.codec_control); /* flush bus */
152         udelay(200);
153 
154         spin_unlock_irqrestore(&chip->ad1843_lock, flags);
155         return 0;
156 }
157 
158 static int sgio2audio_gain_info(struct snd_kcontrol *kcontrol,
159                                struct snd_ctl_elem_info *uinfo)
160 {
161         struct snd_sgio2audio *chip = snd_kcontrol_chip(kcontrol);
162 
163         uinfo->type = SNDRV_CTL_ELEM_TYPE_INTEGER;
164         uinfo->count = 2;
165         uinfo->value.integer.min = 0;
166         uinfo->value.integer.max = ad1843_get_gain_max(&chip->ad1843,
167                                              (int)kcontrol->private_value);
168         return 0;
169 }
170 
171 static int sgio2audio_gain_get(struct snd_kcontrol *kcontrol,
172                                struct snd_ctl_elem_value *ucontrol)
173 {
174         struct snd_sgio2audio *chip = snd_kcontrol_chip(kcontrol);
175         int vol;
176 
177         vol = ad1843_get_gain(&chip->ad1843, (int)kcontrol->private_value);
178 
179         ucontrol->value.integer.value[0] = (vol >> 8) & 0xFF;
180         ucontrol->value.integer.value[1] = vol & 0xFF;
181 
182         return 0;
183 }
184 
185 static int sgio2audio_gain_put(struct snd_kcontrol *kcontrol,
186                         struct snd_ctl_elem_value *ucontrol)
187 {
188         struct snd_sgio2audio *chip = snd_kcontrol_chip(kcontrol);
189         int newvol, oldvol;
190 
191         oldvol = ad1843_get_gain(&chip->ad1843, kcontrol->private_value);
192         newvol = (ucontrol->value.integer.value[0] << 8) |
193                 ucontrol->value.integer.value[1];
194 
195         newvol = ad1843_set_gain(&chip->ad1843, kcontrol->private_value,
196                 newvol);
197 
198         return newvol != oldvol;
199 }
200 
201 static int sgio2audio_source_info(struct snd_kcontrol *kcontrol,
202                                struct snd_ctl_elem_info *uinfo)
203 {
204         static const char *texts[3] = {
205                 "Cam Mic", "Mic", "Line"
206         };
207         uinfo->type = SNDRV_CTL_ELEM_TYPE_ENUMERATED;
208         uinfo->count = 1;
209         uinfo->value.enumerated.items = 3;
210         if (uinfo->value.enumerated.item >= 3)
211                 uinfo->value.enumerated.item = 1;
212         strcpy(uinfo->value.enumerated.name,
213                texts[uinfo->value.enumerated.item]);
214         return 0;
215 }
216 
217 static int sgio2audio_source_get(struct snd_kcontrol *kcontrol,
218                                struct snd_ctl_elem_value *ucontrol)
219 {
220         struct snd_sgio2audio *chip = snd_kcontrol_chip(kcontrol);
221 
222         ucontrol->value.enumerated.item[0] = ad1843_get_recsrc(&chip->ad1843);
223         return 0;
224 }
225 
226 static int sgio2audio_source_put(struct snd_kcontrol *kcontrol,
227                         struct snd_ctl_elem_value *ucontrol)
228 {
229         struct snd_sgio2audio *chip = snd_kcontrol_chip(kcontrol);
230         int newsrc, oldsrc;
231 
232         oldsrc = ad1843_get_recsrc(&chip->ad1843);
233         newsrc = ad1843_set_recsrc(&chip->ad1843,
234                                    ucontrol->value.enumerated.item[0]);
235 
236         return newsrc != oldsrc;
237 }
238 
239 /* dac1/pcm0 mixer control */
240 static struct snd_kcontrol_new sgio2audio_ctrl_pcm0 = {
241         .iface          = SNDRV_CTL_ELEM_IFACE_MIXER,
242         .name           = "PCM Playback Volume",
243         .index          = 0,
244         .access         = SNDRV_CTL_ELEM_ACCESS_READWRITE,
245         .private_value  = AD1843_GAIN_PCM_0,
246         .info           = sgio2audio_gain_info,
247         .get            = sgio2audio_gain_get,
248         .put            = sgio2audio_gain_put,
249 };
250 
251 /* dac2/pcm1 mixer control */
252 static struct snd_kcontrol_new sgio2audio_ctrl_pcm1 = {
253         .iface          = SNDRV_CTL_ELEM_IFACE_MIXER,
254         .name           = "PCM Playback Volume",
255         .index          = 1,
256         .access         = SNDRV_CTL_ELEM_ACCESS_READWRITE,
257         .private_value  = AD1843_GAIN_PCM_1,
258         .info           = sgio2audio_gain_info,
259         .get            = sgio2audio_gain_get,
260         .put            = sgio2audio_gain_put,
261 };
262 
263 /* record level mixer control */
264 static struct snd_kcontrol_new sgio2audio_ctrl_reclevel = {
265         .iface          = SNDRV_CTL_ELEM_IFACE_MIXER,
266         .name           = "Capture Volume",
267         .access         = SNDRV_CTL_ELEM_ACCESS_READWRITE,
268         .private_value  = AD1843_GAIN_RECLEV,
269         .info           = sgio2audio_gain_info,
270         .get            = sgio2audio_gain_get,
271         .put            = sgio2audio_gain_put,
272 };
273 
274 /* record level source control */
275 static struct snd_kcontrol_new sgio2audio_ctrl_recsource = {
276         .iface          = SNDRV_CTL_ELEM_IFACE_MIXER,
277         .name           = "Capture Source",
278         .access         = SNDRV_CTL_ELEM_ACCESS_READWRITE,
279         .info           = sgio2audio_source_info,
280         .get            = sgio2audio_source_get,
281         .put            = sgio2audio_source_put,
282 };
283 
284 /* line mixer control */
285 static struct snd_kcontrol_new sgio2audio_ctrl_line = {
286         .iface          = SNDRV_CTL_ELEM_IFACE_MIXER,
287         .name           = "Line Playback Volume",
288         .index          = 0,
289         .access         = SNDRV_CTL_ELEM_ACCESS_READWRITE,
290         .private_value  = AD1843_GAIN_LINE,
291         .info           = sgio2audio_gain_info,
292         .get            = sgio2audio_gain_get,
293         .put            = sgio2audio_gain_put,
294 };
295 
296 /* cd mixer control */
297 static struct snd_kcontrol_new sgio2audio_ctrl_cd = {
298         .iface          = SNDRV_CTL_ELEM_IFACE_MIXER,
299         .name           = "Line Playback Volume",
300         .index          = 1,
301         .access         = SNDRV_CTL_ELEM_ACCESS_READWRITE,
302         .private_value  = AD1843_GAIN_LINE_2,
303         .info           = sgio2audio_gain_info,
304         .get            = sgio2audio_gain_get,
305         .put            = sgio2audio_gain_put,
306 };
307 
308 /* mic mixer control */
309 static struct snd_kcontrol_new sgio2audio_ctrl_mic = {
310         .iface          = SNDRV_CTL_ELEM_IFACE_MIXER,
311         .name           = "Mic Playback Volume",
312         .access         = SNDRV_CTL_ELEM_ACCESS_READWRITE,
313         .private_value  = AD1843_GAIN_MIC,
314         .info           = sgio2audio_gain_info,
315         .get            = sgio2audio_gain_get,
316         .put            = sgio2audio_gain_put,
317 };
318 
319 
320 static int snd_sgio2audio_new_mixer(struct snd_sgio2audio *chip)
321 {
322         int err;
323 
324         err = snd_ctl_add(chip->card,
325                           snd_ctl_new1(&sgio2audio_ctrl_pcm0, chip));
326         if (err < 0)
327                 return err;
328 
329         err = snd_ctl_add(chip->card,
330                           snd_ctl_new1(&sgio2audio_ctrl_pcm1, chip));
331         if (err < 0)
332                 return err;
333 
334         err = snd_ctl_add(chip->card,
335                           snd_ctl_new1(&sgio2audio_ctrl_reclevel, chip));
336         if (err < 0)
337                 return err;
338 
339         err = snd_ctl_add(chip->card,
340                           snd_ctl_new1(&sgio2audio_ctrl_recsource, chip));
341         if (err < 0)
342                 return err;
343         err = snd_ctl_add(chip->card,
344                           snd_ctl_new1(&sgio2audio_ctrl_line, chip));
345         if (err < 0)
346                 return err;
347 
348         err = snd_ctl_add(chip->card,
349                           snd_ctl_new1(&sgio2audio_ctrl_cd, chip));
350         if (err < 0)
351                 return err;
352 
353         err = snd_ctl_add(chip->card,
354                           snd_ctl_new1(&sgio2audio_ctrl_mic, chip));
355         if (err < 0)
356                 return err;
357 
358         return 0;
359 }
360 
361 /* low-level audio interface DMA */
362 
363 /* get data out of bounce buffer, count must be a multiple of 32 */
364 /* returns 1 if a period has elapsed */
365 static int snd_sgio2audio_dma_pull_frag(struct snd_sgio2audio *chip,
366                                         unsigned int ch, unsigned int count)
367 {
368         int ret;
369         unsigned long src_base, src_pos, dst_mask;
370         unsigned char *dst_base;
371         int dst_pos;
372         u64 *src;
373         s16 *dst;
374         u64 x;
375         unsigned long flags;
376         struct snd_pcm_runtime *runtime = chip->channel[ch].substream->runtime;
377 
378         spin_lock_irqsave(&chip->channel[ch].lock, flags);
379 
380         src_base = (unsigned long) chip->ring_base | (ch << CHANNEL_RING_SHIFT);
381         src_pos = readq(&mace->perif.audio.chan[ch].read_ptr);
382         dst_base = runtime->dma_area;
383         dst_pos = chip->channel[ch].pos;
384         dst_mask = frames_to_bytes(runtime, runtime->buffer_size) - 1;
385 
386         /* check if a period has elapsed */
387         chip->channel[ch].size += (count >> 3); /* in frames */
388         ret = chip->channel[ch].size >= runtime->period_size;
389         chip->channel[ch].size %= runtime->period_size;
390 
391         while (count) {
392                 src = (u64 *)(src_base + src_pos);
393                 dst = (s16 *)(dst_base + dst_pos);
394 
395                 x = *src;
396                 dst[0] = (x >> CHANNEL_LEFT_SHIFT) & 0xffff;
397                 dst[1] = (x >> CHANNEL_RIGHT_SHIFT) & 0xffff;
398 
399                 src_pos = (src_pos + sizeof(u64)) & CHANNEL_RING_MASK;
400                 dst_pos = (dst_pos + 2 * sizeof(s16)) & dst_mask;
401                 count -= sizeof(u64);
402         }
403 
404         writeq(src_pos, &mace->perif.audio.chan[ch].read_ptr); /* in bytes */
405         chip->channel[ch].pos = dst_pos;
406 
407         spin_unlock_irqrestore(&chip->channel[ch].lock, flags);
408         return ret;
409 }
410 
411 /* put some DMA data in bounce buffer, count must be a multiple of 32 */
412 /* returns 1 if a period has elapsed */
413 static int snd_sgio2audio_dma_push_frag(struct snd_sgio2audio *chip,
414                                         unsigned int ch, unsigned int count)
415 {
416         int ret;
417         s64 l, r;
418         unsigned long dst_base, dst_pos, src_mask;
419         unsigned char *src_base;
420         int src_pos;
421         u64 *dst;
422         s16 *src;
423         unsigned long flags;
424         struct snd_pcm_runtime *runtime = chip->channel[ch].substream->runtime;
425 
426         spin_lock_irqsave(&chip->channel[ch].lock, flags);
427 
428         dst_base = (unsigned long)chip->ring_base | (ch << CHANNEL_RING_SHIFT);
429         dst_pos = readq(&mace->perif.audio.chan[ch].write_ptr);
430         src_base = runtime->dma_area;
431         src_pos = chip->channel[ch].pos;
432         src_mask = frames_to_bytes(runtime, runtime->buffer_size) - 1;
433 
434         /* check if a period has elapsed */
435         chip->channel[ch].size += (count >> 3); /* in frames */
436         ret = chip->channel[ch].size >= runtime->period_size;
437         chip->channel[ch].size %= runtime->period_size;
438 
439         while (count) {
440                 src = (s16 *)(src_base + src_pos);
441                 dst = (u64 *)(dst_base + dst_pos);
442 
443                 l = src[0]; /* sign extend */
444                 r = src[1]; /* sign extend */
445 
446                 *dst = ((l & 0x00ffffff) << CHANNEL_LEFT_SHIFT) |
447                         ((r & 0x00ffffff) << CHANNEL_RIGHT_SHIFT);
448 
449                 dst_pos = (dst_pos + sizeof(u64)) & CHANNEL_RING_MASK;
450                 src_pos = (src_pos + 2 * sizeof(s16)) & src_mask;
451                 count -= sizeof(u64);
452         }
453 
454         writeq(dst_pos, &mace->perif.audio.chan[ch].write_ptr); /* in bytes */
455         chip->channel[ch].pos = src_pos;
456 
457         spin_unlock_irqrestore(&chip->channel[ch].lock, flags);
458         return ret;
459 }
460 
461 static int snd_sgio2audio_dma_start(struct snd_pcm_substream *substream)
462 {
463         struct snd_sgio2audio *chip = snd_pcm_substream_chip(substream);
464         struct snd_sgio2audio_chan *chan = substream->runtime->private_data;
465         int ch = chan->idx;
466 
467         /* reset DMA channel */
468         writeq(CHANNEL_CONTROL_RESET, &mace->perif.audio.chan[ch].control);
469         udelay(10);
470         writeq(0, &mace->perif.audio.chan[ch].control);
471 
472         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
473                 /* push a full buffer */
474                 snd_sgio2audio_dma_push_frag(chip, ch, CHANNEL_RING_SIZE - 32);
475         }
476         /* set DMA to wake on 50% empty and enable interrupt */
477         writeq(CHANNEL_DMA_ENABLE | CHANNEL_INT_THRESHOLD_50,
478                &mace->perif.audio.chan[ch].control);
479         return 0;
480 }
481 
482 static int snd_sgio2audio_dma_stop(struct snd_pcm_substream *substream)
483 {
484         struct snd_sgio2audio_chan *chan = substream->runtime->private_data;
485 
486         writeq(0, &mace->perif.audio.chan[chan->idx].control);
487         return 0;
488 }
489 
490 static irqreturn_t snd_sgio2audio_dma_in_isr(int irq, void *dev_id)
491 {
492         struct snd_sgio2audio_chan *chan = dev_id;
493         struct snd_pcm_substream *substream;
494         struct snd_sgio2audio *chip;
495         int count, ch;
496 
497         substream = chan->substream;
498         chip = snd_pcm_substream_chip(substream);
499         ch = chan->idx;
500 
501         /* empty the ring */
502         count = CHANNEL_RING_SIZE -
503                 readq(&mace->perif.audio.chan[ch].depth) - 32;
504         if (snd_sgio2audio_dma_pull_frag(chip, ch, count))
505                 snd_pcm_period_elapsed(substream);
506 
507         return IRQ_HANDLED;
508 }
509 
510 static irqreturn_t snd_sgio2audio_dma_out_isr(int irq, void *dev_id)
511 {
512         struct snd_sgio2audio_chan *chan = dev_id;
513         struct snd_pcm_substream *substream;
514         struct snd_sgio2audio *chip;
515         int count, ch;
516 
517         substream = chan->substream;
518         chip = snd_pcm_substream_chip(substream);
519         ch = chan->idx;
520         /* fill the ring */
521         count = CHANNEL_RING_SIZE -
522                 readq(&mace->perif.audio.chan[ch].depth) - 32;
523         if (snd_sgio2audio_dma_push_frag(chip, ch, count))
524                 snd_pcm_period_elapsed(substream);
525 
526         return IRQ_HANDLED;
527 }
528 
529 static irqreturn_t snd_sgio2audio_error_isr(int irq, void *dev_id)
530 {
531         struct snd_sgio2audio_chan *chan = dev_id;
532         struct snd_pcm_substream *substream;
533 
534         substream = chan->substream;
535         snd_sgio2audio_dma_stop(substream);
536         snd_sgio2audio_dma_start(substream);
537         return IRQ_HANDLED;
538 }
539 
540 /* PCM part */
541 /* PCM hardware definition */
542 static struct snd_pcm_hardware snd_sgio2audio_pcm_hw = {
543         .info = (SNDRV_PCM_INFO_MMAP |
544                  SNDRV_PCM_INFO_MMAP_VALID |
545                  SNDRV_PCM_INFO_INTERLEAVED |
546                  SNDRV_PCM_INFO_BLOCK_TRANSFER),
547         .formats =          SNDRV_PCM_FMTBIT_S16_BE,
548         .rates =            SNDRV_PCM_RATE_8000_48000,
549         .rate_min =         8000,
550         .rate_max =         48000,
551         .channels_min =     2,
552         .channels_max =     2,
553         .buffer_bytes_max = 65536,
554         .period_bytes_min = 32768,
555         .period_bytes_max = 65536,
556         .periods_min =      1,
557         .periods_max =      1024,
558 };
559 
560 /* PCM playback open callback */
561 static int snd_sgio2audio_playback1_open(struct snd_pcm_substream *substream)
562 {
563         struct snd_sgio2audio *chip = snd_pcm_substream_chip(substream);
564         struct snd_pcm_runtime *runtime = substream->runtime;
565 
566         runtime->hw = snd_sgio2audio_pcm_hw;
567         runtime->private_data = &chip->channel[1];
568         return 0;
569 }
570 
571 static int snd_sgio2audio_playback2_open(struct snd_pcm_substream *substream)
572 {
573         struct snd_sgio2audio *chip = snd_pcm_substream_chip(substream);
574         struct snd_pcm_runtime *runtime = substream->runtime;
575 
576         runtime->hw = snd_sgio2audio_pcm_hw;
577         runtime->private_data = &chip->channel[2];
578         return 0;
579 }
580 
581 /* PCM capture open callback */
582 static int snd_sgio2audio_capture_open(struct snd_pcm_substream *substream)
583 {
584         struct snd_sgio2audio *chip = snd_pcm_substream_chip(substream);
585         struct snd_pcm_runtime *runtime = substream->runtime;
586 
587         runtime->hw = snd_sgio2audio_pcm_hw;
588         runtime->private_data = &chip->channel[0];
589         return 0;
590 }
591 
592 /* PCM close callback */
593 static int snd_sgio2audio_pcm_close(struct snd_pcm_substream *substream)
594 {
595         struct snd_pcm_runtime *runtime = substream->runtime;
596 
597         runtime->private_data = NULL;
598         return 0;
599 }
600 
601 
602 /* hw_params callback */
603 static int snd_sgio2audio_pcm_hw_params(struct snd_pcm_substream *substream,
604                                         struct snd_pcm_hw_params *hw_params)
605 {
606         return snd_pcm_lib_alloc_vmalloc_buffer(substream,
607                                                 params_buffer_bytes(hw_params));
608 }
609 
610 /* hw_free callback */
611 static int snd_sgio2audio_pcm_hw_free(struct snd_pcm_substream *substream)
612 {
613         return snd_pcm_lib_free_vmalloc_buffer(substream);
614 }
615 
616 /* prepare callback */
617 static int snd_sgio2audio_pcm_prepare(struct snd_pcm_substream *substream)
618 {
619         struct snd_sgio2audio *chip = snd_pcm_substream_chip(substream);
620         struct snd_pcm_runtime *runtime = substream->runtime;
621         struct snd_sgio2audio_chan *chan = substream->runtime->private_data;
622         int ch = chan->idx;
623         unsigned long flags;
624 
625         spin_lock_irqsave(&chip->channel[ch].lock, flags);
626 
627         /* Setup the pseudo-dma transfer pointers.  */
628         chip->channel[ch].pos = 0;
629         chip->channel[ch].size = 0;
630         chip->channel[ch].substream = substream;
631 
632         /* set AD1843 format */
633         /* hardware format is always S16_LE */
634         switch (substream->stream) {
635         case SNDRV_PCM_STREAM_PLAYBACK:
636                 ad1843_setup_dac(&chip->ad1843,
637                                  ch - 1,
638                                  runtime->rate,
639                                  SNDRV_PCM_FORMAT_S16_LE,
640                                  runtime->channels);
641                 break;
642         case SNDRV_PCM_STREAM_CAPTURE:
643                 ad1843_setup_adc(&chip->ad1843,
644                                  runtime->rate,
645                                  SNDRV_PCM_FORMAT_S16_LE,
646                                  runtime->channels);
647                 break;
648         }
649         spin_unlock_irqrestore(&chip->channel[ch].lock, flags);
650         return 0;
651 }
652 
653 /* trigger callback */
654 static int snd_sgio2audio_pcm_trigger(struct snd_pcm_substream *substream,
655                                       int cmd)
656 {
657         switch (cmd) {
658         case SNDRV_PCM_TRIGGER_START:
659                 /* start the PCM engine */
660                 snd_sgio2audio_dma_start(substream);
661                 break;
662         case SNDRV_PCM_TRIGGER_STOP:
663                 /* stop the PCM engine */
664                 snd_sgio2audio_dma_stop(substream);
665                 break;
666         default:
667                 return -EINVAL;
668         }
669         return 0;
670 }
671 
672 /* pointer callback */
673 static snd_pcm_uframes_t
674 snd_sgio2audio_pcm_pointer(struct snd_pcm_substream *substream)
675 {
676         struct snd_sgio2audio *chip = snd_pcm_substream_chip(substream);
677         struct snd_sgio2audio_chan *chan = substream->runtime->private_data;
678 
679         /* get the current hardware pointer */
680         return bytes_to_frames(substream->runtime,
681                                chip->channel[chan->idx].pos);
682 }
683 
684 /* operators */
685 static struct snd_pcm_ops snd_sgio2audio_playback1_ops = {
686         .open =        snd_sgio2audio_playback1_open,
687         .close =       snd_sgio2audio_pcm_close,
688         .ioctl =       snd_pcm_lib_ioctl,
689         .hw_params =   snd_sgio2audio_pcm_hw_params,
690         .hw_free =     snd_sgio2audio_pcm_hw_free,
691         .prepare =     snd_sgio2audio_pcm_prepare,
692         .trigger =     snd_sgio2audio_pcm_trigger,
693         .pointer =     snd_sgio2audio_pcm_pointer,
694         .page =        snd_pcm_lib_get_vmalloc_page,
695         .mmap =        snd_pcm_lib_mmap_vmalloc,
696 };
697 
698 static struct snd_pcm_ops snd_sgio2audio_playback2_ops = {
699         .open =        snd_sgio2audio_playback2_open,
700         .close =       snd_sgio2audio_pcm_close,
701         .ioctl =       snd_pcm_lib_ioctl,
702         .hw_params =   snd_sgio2audio_pcm_hw_params,
703         .hw_free =     snd_sgio2audio_pcm_hw_free,
704         .prepare =     snd_sgio2audio_pcm_prepare,
705         .trigger =     snd_sgio2audio_pcm_trigger,
706         .pointer =     snd_sgio2audio_pcm_pointer,
707         .page =        snd_pcm_lib_get_vmalloc_page,
708         .mmap =        snd_pcm_lib_mmap_vmalloc,
709 };
710 
711 static struct snd_pcm_ops snd_sgio2audio_capture_ops = {
712         .open =        snd_sgio2audio_capture_open,
713         .close =       snd_sgio2audio_pcm_close,
714         .ioctl =       snd_pcm_lib_ioctl,
715         .hw_params =   snd_sgio2audio_pcm_hw_params,
716         .hw_free =     snd_sgio2audio_pcm_hw_free,
717         .prepare =     snd_sgio2audio_pcm_prepare,
718         .trigger =     snd_sgio2audio_pcm_trigger,
719         .pointer =     snd_sgio2audio_pcm_pointer,
720         .page =        snd_pcm_lib_get_vmalloc_page,
721         .mmap =        snd_pcm_lib_mmap_vmalloc,
722 };
723 
724 /*
725  *  definitions of capture are omitted here...
726  */
727 
728 /* create a pcm device */
729 static int snd_sgio2audio_new_pcm(struct snd_sgio2audio *chip)
730 {
731         struct snd_pcm *pcm;
732         int err;
733 
734         /* create first pcm device with one outputs and one input */
735         err = snd_pcm_new(chip->card, "SGI O2 Audio", 0, 1, 1, &pcm);
736         if (err < 0)
737                 return err;
738 
739         pcm->private_data = chip;
740         strcpy(pcm->name, "SGI O2 DAC1");
741 
742         /* set operators */
743         snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_PLAYBACK,
744                         &snd_sgio2audio_playback1_ops);
745         snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_CAPTURE,
746                         &snd_sgio2audio_capture_ops);
747 
748         /* create second  pcm device with one outputs and no input */
749         err = snd_pcm_new(chip->card, "SGI O2 Audio", 1, 1, 0, &pcm);
750         if (err < 0)
751                 return err;
752 
753         pcm->private_data = chip;
754         strcpy(pcm->name, "SGI O2 DAC2");
755 
756         /* set operators */
757         snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_PLAYBACK,
758                         &snd_sgio2audio_playback2_ops);
759 
760         return 0;
761 }
762 
763 static struct {
764         int idx;
765         int irq;
766         irqreturn_t (*isr)(int, void *);
767         const char *desc;
768 } snd_sgio2_isr_table[] = {
769         {
770                 .idx = 0,
771                 .irq = MACEISA_AUDIO1_DMAT_IRQ,
772                 .isr = snd_sgio2audio_dma_in_isr,
773                 .desc = "Capture DMA Channel 0"
774         }, {
775                 .idx = 0,
776                 .irq = MACEISA_AUDIO1_OF_IRQ,
777                 .isr = snd_sgio2audio_error_isr,
778                 .desc = "Capture Overflow"
779         }, {
780                 .idx = 1,
781                 .irq = MACEISA_AUDIO2_DMAT_IRQ,
782                 .isr = snd_sgio2audio_dma_out_isr,
783                 .desc = "Playback DMA Channel 1"
784         }, {
785                 .idx = 1,
786                 .irq = MACEISA_AUDIO2_MERR_IRQ,
787                 .isr = snd_sgio2audio_error_isr,
788                 .desc = "Memory Error Channel 1"
789         }, {
790                 .idx = 2,
791                 .irq = MACEISA_AUDIO3_DMAT_IRQ,
792                 .isr = snd_sgio2audio_dma_out_isr,
793                 .desc = "Playback DMA Channel 2"
794         }, {
795                 .idx = 2,
796                 .irq = MACEISA_AUDIO3_MERR_IRQ,
797                 .isr = snd_sgio2audio_error_isr,
798                 .desc = "Memory Error Channel 2"
799         }
800 };
801 
802 /* ALSA driver */
803 
804 static int snd_sgio2audio_free(struct snd_sgio2audio *chip)
805 {
806         int i;
807 
808         /* reset interface */
809         writeq(AUDIO_CONTROL_RESET, &mace->perif.audio.control);
810         udelay(1);
811         writeq(0, &mace->perif.audio.control);
812 
813         /* release IRQ's */
814         for (i = 0; i < ARRAY_SIZE(snd_sgio2_isr_table); i++)
815                 free_irq(snd_sgio2_isr_table[i].irq,
816                          &chip->channel[snd_sgio2_isr_table[i].idx]);
817 
818         dma_free_coherent(NULL, MACEISA_RINGBUFFERS_SIZE,
819                           chip->ring_base, chip->ring_base_dma);
820 
821         /* release card data */
822         kfree(chip);
823         return 0;
824 }
825 
826 static int snd_sgio2audio_dev_free(struct snd_device *device)
827 {
828         struct snd_sgio2audio *chip = device->device_data;
829 
830         return snd_sgio2audio_free(chip);
831 }
832 
833 static struct snd_device_ops ops = {
834         .dev_free = snd_sgio2audio_dev_free,
835 };
836 
837 static int snd_sgio2audio_create(struct snd_card *card,
838                                  struct snd_sgio2audio **rchip)
839 {
840         struct snd_sgio2audio *chip;
841         int i, err;
842 
843         *rchip = NULL;
844 
845         /* check if a codec is attached to the interface */
846         /* (Audio or Audio/Video board present) */
847         if (!(readq(&mace->perif.audio.control) & AUDIO_CONTROL_CODEC_PRESENT))
848                 return -ENOENT;
849 
850         chip = kzalloc(sizeof(struct snd_sgio2audio), GFP_KERNEL);
851         if (chip == NULL)
852                 return -ENOMEM;
853 
854         chip->card = card;
855 
856         chip->ring_base = dma_alloc_coherent(NULL, MACEISA_RINGBUFFERS_SIZE,
857                                              &chip->ring_base_dma, GFP_USER);
858         if (chip->ring_base == NULL) {
859                 printk(KERN_ERR
860                        "sgio2audio: could not allocate ring buffers\n");
861                 kfree(chip);
862                 return -ENOMEM;
863         }
864 
865         spin_lock_init(&chip->ad1843_lock);
866 
867         /* initialize channels */
868         for (i = 0; i < 3; i++) {
869                 spin_lock_init(&chip->channel[i].lock);
870                 chip->channel[i].idx = i;
871         }
872 
873         /* allocate IRQs */
874         for (i = 0; i < ARRAY_SIZE(snd_sgio2_isr_table); i++) {
875                 if (request_irq(snd_sgio2_isr_table[i].irq,
876                                 snd_sgio2_isr_table[i].isr,
877                                 0,
878                                 snd_sgio2_isr_table[i].desc,
879                                 &chip->channel[snd_sgio2_isr_table[i].idx])) {
880                         snd_sgio2audio_free(chip);
881                         printk(KERN_ERR "sgio2audio: cannot allocate irq %d\n",
882                                snd_sgio2_isr_table[i].irq);
883                         return -EBUSY;
884                 }
885         }
886 
887         /* reset the interface */
888         writeq(AUDIO_CONTROL_RESET, &mace->perif.audio.control);
889         udelay(1);
890         writeq(0, &mace->perif.audio.control);
891         msleep_interruptible(1); /* give time to recover */
892 
893         /* set ring base */
894         writeq(chip->ring_base_dma, &mace->perif.ctrl.ringbase);
895 
896         /* attach the AD1843 codec */
897         chip->ad1843.read = read_ad1843_reg;
898         chip->ad1843.write = write_ad1843_reg;
899         chip->ad1843.chip = chip;
900 
901         /* initialize the AD1843 codec */
902         err = ad1843_init(&chip->ad1843);
903         if (err < 0) {
904                 snd_sgio2audio_free(chip);
905                 return err;
906         }
907 
908         err = snd_device_new(card, SNDRV_DEV_LOWLEVEL, chip, &ops);
909         if (err < 0) {
910                 snd_sgio2audio_free(chip);
911                 return err;
912         }
913         *rchip = chip;
914         return 0;
915 }
916 
917 static int snd_sgio2audio_probe(struct platform_device *pdev)
918 {
919         struct snd_card *card;
920         struct snd_sgio2audio *chip;
921         int err;
922 
923         err = snd_card_new(&pdev->dev, index, id, THIS_MODULE, 0, &card);
924         if (err < 0)
925                 return err;
926 
927         err = snd_sgio2audio_create(card, &chip);
928         if (err < 0) {
929                 snd_card_free(card);
930                 return err;
931         }
932 
933         err = snd_sgio2audio_new_pcm(chip);
934         if (err < 0) {
935                 snd_card_free(card);
936                 return err;
937         }
938         err = snd_sgio2audio_new_mixer(chip);
939         if (err < 0) {
940                 snd_card_free(card);
941                 return err;
942         }
943 
944         strcpy(card->driver, "SGI O2 Audio");
945         strcpy(card->shortname, "SGI O2 Audio");
946         sprintf(card->longname, "%s irq %i-%i",
947                 card->shortname,
948                 MACEISA_AUDIO1_DMAT_IRQ,
949                 MACEISA_AUDIO3_MERR_IRQ);
950 
951         err = snd_card_register(card);
952         if (err < 0) {
953                 snd_card_free(card);
954                 return err;
955         }
956         platform_set_drvdata(pdev, card);
957         return 0;
958 }
959 
960 static int snd_sgio2audio_remove(struct platform_device *pdev)
961 {
962         struct snd_card *card = platform_get_drvdata(pdev);
963 
964         snd_card_free(card);
965         return 0;
966 }
967 
968 static struct platform_driver sgio2audio_driver = {
969         .probe  = snd_sgio2audio_probe,
970         .remove = snd_sgio2audio_remove,
971         .driver = {
972                 .name   = "sgio2audio",
973                 .owner  = THIS_MODULE,
974         }
975 };
976 
977 module_platform_driver(sgio2audio_driver);
978 

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