2 * BRIEF MODULE DESCRIPTION
3 * Driver for AMD Au1000 MIPS Processor, AC'97 Sound Port
5 * Copyright 2004 Cooper Street Innovations Inc.
6 * Author: Charles Eidsness <charles@cooper-street.com>
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.
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.
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.
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
37 #include <linux/ioport.h>
38 #include <linux/interrupt.h>
39 #include <linux/init.h>
40 #include <linux/slab.h>
41 #include <sound/core.h>
42 #include <sound/initval.h>
43 #include <sound/pcm.h>
44 #include <sound/pcm_params.h>
45 #include <sound/ac97_codec.h>
46 #include <asm/mach-au1x00/au1000.h>
47 #include <asm/mach-au1x00/au1000_dma.h>
49 MODULE_AUTHOR("Charles Eidsness <charles@cooper-street.com>");
50 MODULE_DESCRIPTION("Au1000 AC'97 ALSA Driver");
51 MODULE_LICENSE("GPL");
52 MODULE_SUPPORTED_DEVICE("{{AMD,Au1000 AC'97}}");
56 #define AC97_SLOT_3 0x01
57 #define AC97_SLOT_4 0x02
58 #define AC97_SLOT_6 0x08
59 #define AC97_CMD_IRQ 31
68 u32 relative_end; /*realtive to start of buffer*/
69 struct au1000_period * next;
72 /*Au1000 AC97 Port Control Reisters*/
73 struct au1000_ac97_reg {
82 struct snd_pcm_substream *substream;
85 struct au1000_period * buffer;
86 unsigned int period_size;
91 struct snd_card *card;
92 struct au1000_ac97_reg volatile *ac97_ioport;
94 struct resource *ac97_res_port;
96 struct snd_ac97 *ac97;
99 struct audio_stream *stream[2]; /* playback & capture */
102 /*--------------------------- Local Functions --------------------------------*/
104 au1000_set_ac97_xmit_slots(struct snd_au1000 *au1000, long xmit_slots)
106 u32 volatile ac97_config;
108 spin_lock(&au1000->ac97_lock);
109 ac97_config = au1000->ac97_ioport->config;
110 ac97_config = ac97_config & ~AC97C_XMIT_SLOTS_MASK;
111 ac97_config |= (xmit_slots << AC97C_XMIT_SLOTS_BIT);
112 au1000->ac97_ioport->config = ac97_config;
113 spin_unlock(&au1000->ac97_lock);
117 au1000_set_ac97_recv_slots(struct snd_au1000 *au1000, long recv_slots)
119 u32 volatile ac97_config;
121 spin_lock(&au1000->ac97_lock);
122 ac97_config = au1000->ac97_ioport->config;
123 ac97_config = ac97_config & ~AC97C_RECV_SLOTS_MASK;
124 ac97_config |= (recv_slots << AC97C_RECV_SLOTS_BIT);
125 au1000->ac97_ioport->config = ac97_config;
126 spin_unlock(&au1000->ac97_lock);
131 au1000_release_dma_link(struct audio_stream *stream)
133 struct au1000_period * pointer;
134 struct au1000_period * pointer_next;
136 stream->period_size = 0;
138 pointer = stream->buffer;
142 pointer_next = pointer->next;
144 pointer = pointer_next;
145 } while (pointer != stream->buffer);
146 stream->buffer = NULL;
150 au1000_setup_dma_link(struct audio_stream *stream, unsigned int period_bytes,
151 unsigned int periods)
153 struct snd_pcm_substream *substream = stream->substream;
154 struct snd_pcm_runtime *runtime = substream->runtime;
155 struct au1000_period *pointer;
156 unsigned long dma_start;
159 dma_start = virt_to_phys(runtime->dma_area);
161 if (stream->period_size == period_bytes &&
162 stream->periods == periods)
163 return 0; /* not changed */
165 au1000_release_dma_link(stream);
167 stream->period_size = period_bytes;
168 stream->periods = periods;
170 stream->buffer = kmalloc(sizeof(struct au1000_period), GFP_KERNEL);
171 if (! stream->buffer)
173 pointer = stream->buffer;
174 for (i = 0; i < periods; i++) {
175 pointer->start = (u32)(dma_start + (i * period_bytes));
176 pointer->relative_end = (u32) (((i+1) * period_bytes) - 0x1);
177 if (i < periods - 1) {
178 pointer->next = kmalloc(sizeof(struct au1000_period), GFP_KERNEL);
179 if (! pointer->next) {
180 au1000_release_dma_link(stream);
183 pointer = pointer->next;
186 pointer->next = stream->buffer;
191 au1000_dma_stop(struct audio_stream *stream)
193 if (snd_BUG_ON(!stream->buffer))
195 disable_dma(stream->dma);
199 au1000_dma_start(struct audio_stream *stream)
201 if (snd_BUG_ON(!stream->buffer))
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);
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);
218 enable_dma_buffers(stream->dma);
219 start_dma(stream->dma);
223 au1000_dma_interrupt(int irq, void *dev_id)
225 struct audio_stream *stream = (struct audio_stream *) dev_id;
226 struct snd_pcm_substream *substream = stream->substream;
228 spin_lock(&stream->dma_lock);
229 switch (get_dma_buffer_done(stream->dma)) {
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);
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);
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);
249 case (~DMA_D0 & ~DMA_D1):
250 printk(KERN_ERR "DMA %d empty irq.\n",stream->dma);
252 spin_unlock(&stream->dma_lock);
253 snd_pcm_period_elapsed(substream);
257 /*-------------------------- PCM Audio Streams -------------------------------*/
259 static unsigned int rates[] = {8000, 11025, 16000, 22050};
260 static struct snd_pcm_hw_constraint_list hw_constraints_rates = {
261 .count = ARRAY_SIZE(rates),
266 static struct snd_pcm_hardware snd_au1000_hw =
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),
277 .buffer_bytes_max = 128*1024,
278 .period_bytes_min = 32,
279 .period_bytes_max = 16*1024,
286 snd_au1000_playback_open(struct snd_pcm_substream *substream)
288 struct snd_au1000 *au1000 = substream->pcm->private_data;
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);
299 snd_au1000_capture_open(struct snd_pcm_substream *substream)
301 struct snd_au1000 *au1000 = substream->pcm->private_data;
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);
312 snd_au1000_playback_close(struct snd_pcm_substream *substream)
314 struct snd_au1000 *au1000 = substream->pcm->private_data;
316 au1000->stream[PLAYBACK]->substream = NULL;
321 snd_au1000_capture_close(struct snd_pcm_substream *substream)
323 struct snd_au1000 *au1000 = substream->pcm->private_data;
325 au1000->stream[CAPTURE]->substream = NULL;
330 snd_au1000_hw_params(struct snd_pcm_substream *substream,
331 struct snd_pcm_hw_params *hw_params)
333 struct audio_stream *stream = substream->private_data;
336 err = snd_pcm_lib_malloc_pages(substream,
337 params_buffer_bytes(hw_params));
340 return au1000_setup_dma_link(stream,
341 params_period_bytes(hw_params),
342 params_periods(hw_params));
346 snd_au1000_hw_free(struct snd_pcm_substream *substream)
348 struct audio_stream *stream = substream->private_data;
349 au1000_release_dma_link(stream);
350 return snd_pcm_lib_free_pages(substream);
354 snd_au1000_playback_prepare(struct snd_pcm_substream *substream)
356 struct snd_au1000 *au1000 = substream->pcm->private_data;
357 struct snd_pcm_runtime *runtime = substream->runtime;
359 if (runtime->channels == 1)
360 au1000_set_ac97_xmit_slots(au1000, AC97_SLOT_4);
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);
368 snd_au1000_capture_prepare(struct snd_pcm_substream *substream)
370 struct snd_au1000 *au1000 = substream->pcm->private_data;
371 struct snd_pcm_runtime *runtime = substream->runtime;
373 if (runtime->channels == 1)
374 au1000_set_ac97_recv_slots(au1000, AC97_SLOT_4);
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);
382 snd_au1000_trigger(struct snd_pcm_substream *substream, int cmd)
384 struct audio_stream *stream = substream->private_data;
387 spin_lock(&stream->dma_lock);
389 case SNDRV_PCM_TRIGGER_START:
390 au1000_dma_start(stream);
392 case SNDRV_PCM_TRIGGER_STOP:
393 au1000_dma_stop(stream);
399 spin_unlock(&stream->dma_lock);
403 static snd_pcm_uframes_t
404 snd_au1000_pointer(struct snd_pcm_substream *substream)
406 struct audio_stream *stream = substream->private_data;
407 struct snd_pcm_runtime *runtime = substream->runtime;
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;
416 return bytes_to_frames(runtime,location);
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,
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,
442 snd_au1000_pcm_new(struct snd_au1000 *au1000)
448 if ((err = snd_pcm_new(au1000->card, "AU1000 AC97 PCM", 0, 1, 1, &pcm)) < 0)
451 snd_pcm_lib_preallocate_pages_for_all(pcm, SNDRV_DMA_TYPE_CONTINUOUS,
452 snd_dma_continuous_data(GFP_KERNEL), 128*1024, 128*1024);
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);
459 pcm->private_data = au1000;
461 strcpy(pcm->name, "Au1000 AC97 PCM");
463 spin_lock_init(&au1000->stream[PLAYBACK]->dma_lock);
464 spin_lock_init(&au1000->stream[CAPTURE]->dma_lock);
466 flags = claim_dma_lock();
467 if ((au1000->stream[PLAYBACK]->dma = request_au1000_dma(DMA_ID_AC97C_TX,
468 "AC97 TX", au1000_dma_interrupt, IRQF_DISABLED,
469 au1000->stream[PLAYBACK])) < 0) {
470 release_dma_lock(flags);
473 if ((au1000->stream[CAPTURE]->dma = request_au1000_dma(DMA_ID_AC97C_RX,
474 "AC97 RX", au1000_dma_interrupt, IRQF_DISABLED,
475 au1000->stream[CAPTURE])) < 0){
476 release_dma_lock(flags);
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);
490 /*-------------------------- AC97 CODEC Control ------------------------------*/
492 static unsigned short
493 snd_au1000_ac97_read(struct snd_ac97 *ac97, unsigned short reg)
495 struct snd_au1000 *au1000 = ac97->private_data;
500 spin_lock(&au1000->ac97_lock);
501 /* would rather use the interrupt than this polling but it works and I can't
502 get the interrupt driven case to work efficiently */
503 for (i = 0; i < 0x5000; i++)
504 if (!(au1000->ac97_ioport->status & AC97C_CP))
507 printk(KERN_ERR "au1000 AC97: AC97 command read timeout\n");
509 cmd = (u32) reg & AC97C_INDEX_MASK;
511 au1000->ac97_ioport->cmd = cmd;
513 /* now wait for the data */
514 for (i = 0; i < 0x5000; i++)
515 if (!(au1000->ac97_ioport->status & AC97C_CP))
518 printk(KERN_ERR "au1000 AC97: AC97 command read timeout\n");
522 data = au1000->ac97_ioport->cmd & 0xffff;
523 spin_unlock(&au1000->ac97_lock);
531 snd_au1000_ac97_write(struct snd_ac97 *ac97, unsigned short reg, unsigned short val)
533 struct snd_au1000 *au1000 = ac97->private_data;
537 spin_lock(&au1000->ac97_lock);
538 /* would rather use the interrupt than this polling but it works and I can't
539 get the interrupt driven case to work efficiently */
540 for (i = 0; i < 0x5000; i++)
541 if (!(au1000->ac97_ioport->status & AC97C_CP))
544 printk(KERN_ERR "au1000 AC97: AC97 command write timeout\n");
546 cmd = (u32) reg & AC97C_INDEX_MASK;
548 cmd |= ((u32) val << AC97C_WD_BIT);
549 au1000->ac97_ioport->cmd = cmd;
550 spin_unlock(&au1000->ac97_lock);
554 snd_au1000_ac97_new(struct snd_au1000 *au1000)
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,
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");
569 au1000->ac97_ioport = (struct au1000_ac97_reg *)
570 KSEG1ADDR(au1000->ac97_res_port->start);
572 spin_lock_init(&au1000->ac97_lock);
574 /* configure pins for AC'97
575 TODO: move to board_setup.c */
576 au_writel(au_readl(SYS_PINFUNC) & ~0x02, SYS_PINFUNC);
578 /* Initialise Au1000's AC'97 Control Block */
579 au1000->ac97_ioport->cntrl = AC97C_RS | AC97C_CE;
581 au1000->ac97_ioport->cntrl = AC97C_CE;
584 /* Initialise External CODEC -- cold reset */
585 au1000->ac97_ioport->config = AC97C_RESET;
587 au1000->ac97_ioport->config = 0x0;
590 /* Initialise AC97 middle-layer */
591 if ((err = snd_ac97_bus(au1000->card, 0, &ops, au1000, &pbus)) < 0)
594 memset(&ac97, 0, sizeof(ac97));
595 ac97.private_data = au1000;
596 if ((err = snd_ac97_mixer(pbus, &ac97, &au1000->ac97)) < 0)
602 /*------------------------------ Setup / Destroy ----------------------------*/
605 snd_au1000_free(struct snd_card *card)
607 struct snd_au1000 *au1000 = card->private_data;
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);
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]);
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]);
630 static struct snd_card *au1000_card;
636 struct snd_card *card;
637 struct snd_au1000 *au1000;
639 err = snd_card_create(-1, "AC97", THIS_MODULE,
640 sizeof(struct snd_au1000), &card);
644 card->private_free = snd_au1000_free;
645 au1000 = card->private_data;
648 au1000->stream[PLAYBACK] = kmalloc(sizeof(struct audio_stream), GFP_KERNEL);
649 au1000->stream[CAPTURE ] = kmalloc(sizeof(struct audio_stream), GFP_KERNEL);
650 /* so that snd_au1000_free will work as intended */
651 au1000->ac97_res_port = NULL;
652 if (au1000->stream[PLAYBACK])
653 au1000->stream[PLAYBACK]->dma = -1;
654 if (au1000->stream[CAPTURE ])
655 au1000->stream[CAPTURE ]->dma = -1;
657 if (au1000->stream[PLAYBACK] == NULL ||
658 au1000->stream[CAPTURE ] == NULL) {
663 if ((err = snd_au1000_ac97_new(au1000)) < 0 ) {
668 if ((err = snd_au1000_pcm_new(au1000)) < 0) {
673 strcpy(card->driver, "Au1000-AC97");
674 strcpy(card->shortname, "AMD Au1000-AC97");
675 sprintf(card->longname, "AMD Au1000--AC97 ALSA Driver");
677 if ((err = snd_card_register(card)) < 0) {
682 printk(KERN_INFO "ALSA AC97: Driver Initialized\n");
687 static void __exit au1000_exit(void)
689 snd_card_free(au1000_card);
692 module_init(au1000_init);
693 module_exit(au1000_exit);