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Linux/sound/soc/txx9/txx9aclc.c

  1 /*
  2  * Generic TXx9 ACLC platform driver
  3  *
  4  * Copyright (C) 2009 Atsushi Nemoto
  5  *
  6  * Based on RBTX49xx patch from CELF patch archive.
  7  * (C) Copyright TOSHIBA CORPORATION 2004-2006
  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 version 2 as
 11  * published by the Free Software Foundation.
 12  */
 13 
 14 #include <linux/module.h>
 15 #include <linux/init.h>
 16 #include <linux/platform_device.h>
 17 #include <linux/scatterlist.h>
 18 #include <linux/slab.h>
 19 #include <linux/dmaengine.h>
 20 #include <sound/core.h>
 21 #include <sound/pcm.h>
 22 #include <sound/pcm_params.h>
 23 #include <sound/soc.h>
 24 #include "txx9aclc.h"
 25 
 26 static struct txx9aclc_soc_device {
 27         struct txx9aclc_dmadata dmadata[2];
 28 } txx9aclc_soc_device;
 29 
 30 /* REVISIT: How to find txx9aclc_drvdata from snd_ac97? */
 31 static struct txx9aclc_plat_drvdata *txx9aclc_drvdata;
 32 
 33 static int txx9aclc_dma_init(struct txx9aclc_soc_device *dev,
 34                              struct txx9aclc_dmadata *dmadata);
 35 
 36 static const struct snd_pcm_hardware txx9aclc_pcm_hardware = {
 37         /*
 38          * REVISIT: SNDRV_PCM_INFO_MMAP | SNDRV_PCM_INFO_MMAP_VALID
 39          * needs more works for noncoherent MIPS.
 40          */
 41         .info             = SNDRV_PCM_INFO_INTERLEAVED |
 42                             SNDRV_PCM_INFO_BATCH |
 43                             SNDRV_PCM_INFO_PAUSE,
 44         .period_bytes_min = 1024,
 45         .period_bytes_max = 8 * 1024,
 46         .periods_min      = 2,
 47         .periods_max      = 4096,
 48         .buffer_bytes_max = 32 * 1024,
 49 };
 50 
 51 static int txx9aclc_pcm_hw_params(struct snd_pcm_substream *substream,
 52                                   struct snd_pcm_hw_params *params)
 53 {
 54         struct snd_soc_pcm_runtime *rtd = snd_pcm_substream_chip(substream);
 55         struct snd_pcm_runtime *runtime = substream->runtime;
 56         struct txx9aclc_dmadata *dmadata = runtime->private_data;
 57         int ret;
 58 
 59         ret = snd_pcm_lib_malloc_pages(substream, params_buffer_bytes(params));
 60         if (ret < 0)
 61                 return ret;
 62 
 63         dev_dbg(rtd->platform->dev,
 64                 "runtime->dma_area = %#lx dma_addr = %#lx dma_bytes = %zd "
 65                 "runtime->min_align %ld\n",
 66                 (unsigned long)runtime->dma_area,
 67                 (unsigned long)runtime->dma_addr, runtime->dma_bytes,
 68                 runtime->min_align);
 69         dev_dbg(rtd->platform->dev,
 70                 "periods %d period_bytes %d stream %d\n",
 71                 params_periods(params), params_period_bytes(params),
 72                 substream->stream);
 73 
 74         dmadata->substream = substream;
 75         dmadata->pos = 0;
 76         return 0;
 77 }
 78 
 79 static int txx9aclc_pcm_hw_free(struct snd_pcm_substream *substream)
 80 {
 81         return snd_pcm_lib_free_pages(substream);
 82 }
 83 
 84 static int txx9aclc_pcm_prepare(struct snd_pcm_substream *substream)
 85 {
 86         struct snd_pcm_runtime *runtime = substream->runtime;
 87         struct txx9aclc_dmadata *dmadata = runtime->private_data;
 88 
 89         dmadata->dma_addr = runtime->dma_addr;
 90         dmadata->buffer_bytes = snd_pcm_lib_buffer_bytes(substream);
 91         dmadata->period_bytes = snd_pcm_lib_period_bytes(substream);
 92 
 93         if (dmadata->buffer_bytes == dmadata->period_bytes) {
 94                 dmadata->frag_bytes = dmadata->period_bytes >> 1;
 95                 dmadata->frags = 2;
 96         } else {
 97                 dmadata->frag_bytes = dmadata->period_bytes;
 98                 dmadata->frags = dmadata->buffer_bytes / dmadata->period_bytes;
 99         }
100         dmadata->frag_count = 0;
101         dmadata->pos = 0;
102         return 0;
103 }
104 
105 static void txx9aclc_dma_complete(void *arg)
106 {
107         struct txx9aclc_dmadata *dmadata = arg;
108         unsigned long flags;
109 
110         /* dma completion handler cannot submit new operations */
111         spin_lock_irqsave(&dmadata->dma_lock, flags);
112         if (dmadata->frag_count >= 0) {
113                 dmadata->dmacount--;
114                 if (!WARN_ON(dmadata->dmacount < 0))
115                         tasklet_schedule(&dmadata->tasklet);
116         }
117         spin_unlock_irqrestore(&dmadata->dma_lock, flags);
118 }
119 
120 static struct dma_async_tx_descriptor *
121 txx9aclc_dma_submit(struct txx9aclc_dmadata *dmadata, dma_addr_t buf_dma_addr)
122 {
123         struct dma_chan *chan = dmadata->dma_chan;
124         struct dma_async_tx_descriptor *desc;
125         struct scatterlist sg;
126 
127         sg_init_table(&sg, 1);
128         sg_set_page(&sg, pfn_to_page(PFN_DOWN(buf_dma_addr)),
129                     dmadata->frag_bytes, buf_dma_addr & (PAGE_SIZE - 1));
130         sg_dma_address(&sg) = buf_dma_addr;
131         desc = dmaengine_prep_slave_sg(chan, &sg, 1,
132                 dmadata->substream->stream == SNDRV_PCM_STREAM_PLAYBACK ?
133                 DMA_MEM_TO_DEV : DMA_DEV_TO_MEM,
134                 DMA_PREP_INTERRUPT | DMA_CTRL_ACK);
135         if (!desc) {
136                 dev_err(&chan->dev->device, "cannot prepare slave dma\n");
137                 return NULL;
138         }
139         desc->callback = txx9aclc_dma_complete;
140         desc->callback_param = dmadata;
141         dmaengine_submit(desc);
142         return desc;
143 }
144 
145 #define NR_DMA_CHAIN            2
146 
147 static void txx9aclc_dma_tasklet(unsigned long data)
148 {
149         struct txx9aclc_dmadata *dmadata = (struct txx9aclc_dmadata *)data;
150         struct dma_chan *chan = dmadata->dma_chan;
151         struct dma_async_tx_descriptor *desc;
152         struct snd_pcm_substream *substream = dmadata->substream;
153         u32 ctlbit = substream->stream == SNDRV_PCM_STREAM_PLAYBACK ?
154                 ACCTL_AUDODMA : ACCTL_AUDIDMA;
155         int i;
156         unsigned long flags;
157 
158         spin_lock_irqsave(&dmadata->dma_lock, flags);
159         if (dmadata->frag_count < 0) {
160                 struct txx9aclc_plat_drvdata *drvdata = txx9aclc_drvdata;
161                 void __iomem *base = drvdata->base;
162 
163                 spin_unlock_irqrestore(&dmadata->dma_lock, flags);
164                 dmaengine_terminate_all(chan);
165                 /* first time */
166                 for (i = 0; i < NR_DMA_CHAIN; i++) {
167                         desc = txx9aclc_dma_submit(dmadata,
168                                 dmadata->dma_addr + i * dmadata->frag_bytes);
169                         if (!desc)
170                                 return;
171                 }
172                 dmadata->dmacount = NR_DMA_CHAIN;
173                 dma_async_issue_pending(chan);
174                 spin_lock_irqsave(&dmadata->dma_lock, flags);
175                 __raw_writel(ctlbit, base + ACCTLEN);
176                 dmadata->frag_count = NR_DMA_CHAIN % dmadata->frags;
177                 spin_unlock_irqrestore(&dmadata->dma_lock, flags);
178                 return;
179         }
180         if (WARN_ON(dmadata->dmacount >= NR_DMA_CHAIN)) {
181                 spin_unlock_irqrestore(&dmadata->dma_lock, flags);
182                 return;
183         }
184         while (dmadata->dmacount < NR_DMA_CHAIN) {
185                 dmadata->dmacount++;
186                 spin_unlock_irqrestore(&dmadata->dma_lock, flags);
187                 desc = txx9aclc_dma_submit(dmadata,
188                         dmadata->dma_addr +
189                         dmadata->frag_count * dmadata->frag_bytes);
190                 if (!desc)
191                         return;
192                 dma_async_issue_pending(chan);
193 
194                 spin_lock_irqsave(&dmadata->dma_lock, flags);
195                 dmadata->frag_count++;
196                 dmadata->frag_count %= dmadata->frags;
197                 dmadata->pos += dmadata->frag_bytes;
198                 dmadata->pos %= dmadata->buffer_bytes;
199                 if ((dmadata->frag_count * dmadata->frag_bytes) %
200                     dmadata->period_bytes == 0)
201                         snd_pcm_period_elapsed(substream);
202         }
203         spin_unlock_irqrestore(&dmadata->dma_lock, flags);
204 }
205 
206 static int txx9aclc_pcm_trigger(struct snd_pcm_substream *substream, int cmd)
207 {
208         struct txx9aclc_dmadata *dmadata = substream->runtime->private_data;
209         struct txx9aclc_plat_drvdata *drvdata =txx9aclc_drvdata;
210         void __iomem *base = drvdata->base;
211         unsigned long flags;
212         int ret = 0;
213         u32 ctlbit = substream->stream == SNDRV_PCM_STREAM_PLAYBACK ?
214                 ACCTL_AUDODMA : ACCTL_AUDIDMA;
215 
216         spin_lock_irqsave(&dmadata->dma_lock, flags);
217         switch (cmd) {
218         case SNDRV_PCM_TRIGGER_START:
219                 dmadata->frag_count = -1;
220                 tasklet_schedule(&dmadata->tasklet);
221                 break;
222         case SNDRV_PCM_TRIGGER_STOP:
223         case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
224         case SNDRV_PCM_TRIGGER_SUSPEND:
225                 __raw_writel(ctlbit, base + ACCTLDIS);
226                 break;
227         case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
228         case SNDRV_PCM_TRIGGER_RESUME:
229                 __raw_writel(ctlbit, base + ACCTLEN);
230                 break;
231         default:
232                 ret = -EINVAL;
233         }
234         spin_unlock_irqrestore(&dmadata->dma_lock, flags);
235         return ret;
236 }
237 
238 static snd_pcm_uframes_t
239 txx9aclc_pcm_pointer(struct snd_pcm_substream *substream)
240 {
241         struct txx9aclc_dmadata *dmadata = substream->runtime->private_data;
242 
243         return bytes_to_frames(substream->runtime, dmadata->pos);
244 }
245 
246 static int txx9aclc_pcm_open(struct snd_pcm_substream *substream)
247 {
248         struct txx9aclc_soc_device *dev = &txx9aclc_soc_device;
249         struct txx9aclc_dmadata *dmadata = &dev->dmadata[substream->stream];
250         int ret;
251 
252         ret = snd_soc_set_runtime_hwparams(substream, &txx9aclc_pcm_hardware);
253         if (ret)
254                 return ret;
255         /* ensure that buffer size is a multiple of period size */
256         ret = snd_pcm_hw_constraint_integer(substream->runtime,
257                                             SNDRV_PCM_HW_PARAM_PERIODS);
258         if (ret < 0)
259                 return ret;
260         substream->runtime->private_data = dmadata;
261         return 0;
262 }
263 
264 static int txx9aclc_pcm_close(struct snd_pcm_substream *substream)
265 {
266         struct txx9aclc_dmadata *dmadata = substream->runtime->private_data;
267         struct dma_chan *chan = dmadata->dma_chan;
268 
269         dmadata->frag_count = -1;
270         dmaengine_terminate_all(chan);
271         return 0;
272 }
273 
274 static struct snd_pcm_ops txx9aclc_pcm_ops = {
275         .open           = txx9aclc_pcm_open,
276         .close          = txx9aclc_pcm_close,
277         .ioctl          = snd_pcm_lib_ioctl,
278         .hw_params      = txx9aclc_pcm_hw_params,
279         .hw_free        = txx9aclc_pcm_hw_free,
280         .prepare        = txx9aclc_pcm_prepare,
281         .trigger        = txx9aclc_pcm_trigger,
282         .pointer        = txx9aclc_pcm_pointer,
283 };
284 
285 static void txx9aclc_pcm_free_dma_buffers(struct snd_pcm *pcm)
286 {
287         snd_pcm_lib_preallocate_free_for_all(pcm);
288 }
289 
290 static int txx9aclc_pcm_new(struct snd_soc_pcm_runtime *rtd)
291 {
292         struct snd_card *card = rtd->card->snd_card;
293         struct snd_soc_dai *dai = rtd->cpu_dai;
294         struct snd_pcm *pcm = rtd->pcm;
295         struct platform_device *pdev = to_platform_device(dai->platform->dev);
296         struct txx9aclc_soc_device *dev;
297         struct resource *r;
298         int i;
299         int ret;
300 
301         /* at this point onwards the AC97 component has probed and this will be valid */
302         dev = snd_soc_dai_get_drvdata(dai);
303 
304         dev->dmadata[0].stream = SNDRV_PCM_STREAM_PLAYBACK;
305         dev->dmadata[1].stream = SNDRV_PCM_STREAM_CAPTURE;
306         for (i = 0; i < 2; i++) {
307                 r = platform_get_resource(pdev, IORESOURCE_DMA, i);
308                 if (!r) {
309                         ret = -EBUSY;
310                         goto exit;
311                 }
312                 dev->dmadata[i].dma_res = r;
313                 ret = txx9aclc_dma_init(dev, &dev->dmadata[i]);
314                 if (ret)
315                         goto exit;
316         }
317         return snd_pcm_lib_preallocate_pages_for_all(pcm, SNDRV_DMA_TYPE_DEV,
318                 card->dev, 64 * 1024, 4 * 1024 * 1024);
319 
320 exit:
321         for (i = 0; i < 2; i++) {
322                 if (dev->dmadata[i].dma_chan)
323                         dma_release_channel(dev->dmadata[i].dma_chan);
324                 dev->dmadata[i].dma_chan = NULL;
325         }
326         return ret;
327 }
328 
329 static bool filter(struct dma_chan *chan, void *param)
330 {
331         struct txx9aclc_dmadata *dmadata = param;
332         char *devname;
333         bool found = false;
334 
335         devname = kasprintf(GFP_KERNEL, "%s.%d", dmadata->dma_res->name,
336                 (int)dmadata->dma_res->start);
337         if (strcmp(dev_name(chan->device->dev), devname) == 0) {
338                 chan->private = &dmadata->dma_slave;
339                 found = true;
340         }
341         kfree(devname);
342         return found;
343 }
344 
345 static int txx9aclc_dma_init(struct txx9aclc_soc_device *dev,
346                              struct txx9aclc_dmadata *dmadata)
347 {
348         struct txx9aclc_plat_drvdata *drvdata =txx9aclc_drvdata;
349         struct txx9dmac_slave *ds = &dmadata->dma_slave;
350         dma_cap_mask_t mask;
351 
352         spin_lock_init(&dmadata->dma_lock);
353 
354         ds->reg_width = sizeof(u32);
355         if (dmadata->stream == SNDRV_PCM_STREAM_PLAYBACK) {
356                 ds->tx_reg = drvdata->physbase + ACAUDODAT;
357                 ds->rx_reg = 0;
358         } else {
359                 ds->tx_reg = 0;
360                 ds->rx_reg = drvdata->physbase + ACAUDIDAT;
361         }
362 
363         /* Try to grab a DMA channel */
364         dma_cap_zero(mask);
365         dma_cap_set(DMA_SLAVE, mask);
366         dmadata->dma_chan = dma_request_channel(mask, filter, dmadata);
367         if (!dmadata->dma_chan) {
368                 printk(KERN_ERR
369                         "DMA channel for %s is not available\n",
370                         dmadata->stream == SNDRV_PCM_STREAM_PLAYBACK ?
371                         "playback" : "capture");
372                 return -EBUSY;
373         }
374         tasklet_init(&dmadata->tasklet, txx9aclc_dma_tasklet,
375                      (unsigned long)dmadata);
376         return 0;
377 }
378 
379 static int txx9aclc_pcm_probe(struct snd_soc_platform *platform)
380 {
381         snd_soc_platform_set_drvdata(platform, &txx9aclc_soc_device);
382         return 0;
383 }
384 
385 static int txx9aclc_pcm_remove(struct snd_soc_platform *platform)
386 {
387         struct txx9aclc_soc_device *dev = snd_soc_platform_get_drvdata(platform);
388         struct txx9aclc_plat_drvdata *drvdata = txx9aclc_drvdata;
389         void __iomem *base = drvdata->base;
390         int i;
391 
392         /* disable all FIFO DMAs */
393         __raw_writel(ACCTL_AUDODMA | ACCTL_AUDIDMA, base + ACCTLDIS);
394         /* dummy R/W to clear pending DMAREQ if any */
395         __raw_writel(__raw_readl(base + ACAUDIDAT), base + ACAUDODAT);
396 
397         for (i = 0; i < 2; i++) {
398                 struct txx9aclc_dmadata *dmadata = &dev->dmadata[i];
399                 struct dma_chan *chan = dmadata->dma_chan;
400                 if (chan) {
401                         dmadata->frag_count = -1;
402                         dmaengine_terminate_all(chan);
403                         dma_release_channel(chan);
404                 }
405                 dev->dmadata[i].dma_chan = NULL;
406         }
407         return 0;
408 }
409 
410 static struct snd_soc_platform_driver txx9aclc_soc_platform = {
411         .probe          = txx9aclc_pcm_probe,
412         .remove         = txx9aclc_pcm_remove,
413         .ops            = &txx9aclc_pcm_ops,
414         .pcm_new        = txx9aclc_pcm_new,
415         .pcm_free       = txx9aclc_pcm_free_dma_buffers,
416 };
417 
418 static int txx9aclc_soc_platform_probe(struct platform_device *pdev)
419 {
420         return snd_soc_register_platform(&pdev->dev, &txx9aclc_soc_platform);
421 }
422 
423 static int txx9aclc_soc_platform_remove(struct platform_device *pdev)
424 {
425         snd_soc_unregister_platform(&pdev->dev);
426         return 0;
427 }
428 
429 static struct platform_driver txx9aclc_pcm_driver = {
430         .driver = {
431                         .name = "txx9aclc-pcm-audio",
432                         .owner = THIS_MODULE,
433         },
434 
435         .probe = txx9aclc_soc_platform_probe,
436         .remove = txx9aclc_soc_platform_remove,
437 };
438 
439 module_platform_driver(txx9aclc_pcm_driver);
440 
441 MODULE_AUTHOR("Atsushi Nemoto <anemo@mba.ocn.ne.jp>");
442 MODULE_DESCRIPTION("TXx9 ACLC Audio DMA driver");
443 MODULE_LICENSE("GPL");
444 

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