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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 int txx9aclc_pcm_new(struct snd_soc_pcm_runtime *rtd)
286 {
287         struct snd_card *card = rtd->card->snd_card;
288         struct snd_soc_dai *dai = rtd->cpu_dai;
289         struct snd_pcm *pcm = rtd->pcm;
290         struct platform_device *pdev = to_platform_device(rtd->platform->dev);
291         struct txx9aclc_soc_device *dev;
292         struct resource *r;
293         int i;
294         int ret;
295 
296         /* at this point onwards the AC97 component has probed and this will be valid */
297         dev = snd_soc_dai_get_drvdata(dai);
298 
299         dev->dmadata[0].stream = SNDRV_PCM_STREAM_PLAYBACK;
300         dev->dmadata[1].stream = SNDRV_PCM_STREAM_CAPTURE;
301         for (i = 0; i < 2; i++) {
302                 r = platform_get_resource(pdev, IORESOURCE_DMA, i);
303                 if (!r) {
304                         ret = -EBUSY;
305                         goto exit;
306                 }
307                 dev->dmadata[i].dma_res = r;
308                 ret = txx9aclc_dma_init(dev, &dev->dmadata[i]);
309                 if (ret)
310                         goto exit;
311         }
312         return snd_pcm_lib_preallocate_pages_for_all(pcm, SNDRV_DMA_TYPE_DEV,
313                 card->dev, 64 * 1024, 4 * 1024 * 1024);
314 
315 exit:
316         for (i = 0; i < 2; i++) {
317                 if (dev->dmadata[i].dma_chan)
318                         dma_release_channel(dev->dmadata[i].dma_chan);
319                 dev->dmadata[i].dma_chan = NULL;
320         }
321         return ret;
322 }
323 
324 static bool filter(struct dma_chan *chan, void *param)
325 {
326         struct txx9aclc_dmadata *dmadata = param;
327         char *devname;
328         bool found = false;
329 
330         devname = kasprintf(GFP_KERNEL, "%s.%d", dmadata->dma_res->name,
331                 (int)dmadata->dma_res->start);
332         if (strcmp(dev_name(chan->device->dev), devname) == 0) {
333                 chan->private = &dmadata->dma_slave;
334                 found = true;
335         }
336         kfree(devname);
337         return found;
338 }
339 
340 static int txx9aclc_dma_init(struct txx9aclc_soc_device *dev,
341                              struct txx9aclc_dmadata *dmadata)
342 {
343         struct txx9aclc_plat_drvdata *drvdata =txx9aclc_drvdata;
344         struct txx9dmac_slave *ds = &dmadata->dma_slave;
345         dma_cap_mask_t mask;
346 
347         spin_lock_init(&dmadata->dma_lock);
348 
349         ds->reg_width = sizeof(u32);
350         if (dmadata->stream == SNDRV_PCM_STREAM_PLAYBACK) {
351                 ds->tx_reg = drvdata->physbase + ACAUDODAT;
352                 ds->rx_reg = 0;
353         } else {
354                 ds->tx_reg = 0;
355                 ds->rx_reg = drvdata->physbase + ACAUDIDAT;
356         }
357 
358         /* Try to grab a DMA channel */
359         dma_cap_zero(mask);
360         dma_cap_set(DMA_SLAVE, mask);
361         dmadata->dma_chan = dma_request_channel(mask, filter, dmadata);
362         if (!dmadata->dma_chan) {
363                 printk(KERN_ERR
364                         "DMA channel for %s is not available\n",
365                         dmadata->stream == SNDRV_PCM_STREAM_PLAYBACK ?
366                         "playback" : "capture");
367                 return -EBUSY;
368         }
369         tasklet_init(&dmadata->tasklet, txx9aclc_dma_tasklet,
370                      (unsigned long)dmadata);
371         return 0;
372 }
373 
374 static int txx9aclc_pcm_probe(struct snd_soc_platform *platform)
375 {
376         snd_soc_platform_set_drvdata(platform, &txx9aclc_soc_device);
377         return 0;
378 }
379 
380 static int txx9aclc_pcm_remove(struct snd_soc_platform *platform)
381 {
382         struct txx9aclc_soc_device *dev = snd_soc_platform_get_drvdata(platform);
383         struct txx9aclc_plat_drvdata *drvdata = txx9aclc_drvdata;
384         void __iomem *base = drvdata->base;
385         int i;
386 
387         /* disable all FIFO DMAs */
388         __raw_writel(ACCTL_AUDODMA | ACCTL_AUDIDMA, base + ACCTLDIS);
389         /* dummy R/W to clear pending DMAREQ if any */
390         __raw_writel(__raw_readl(base + ACAUDIDAT), base + ACAUDODAT);
391 
392         for (i = 0; i < 2; i++) {
393                 struct txx9aclc_dmadata *dmadata = &dev->dmadata[i];
394                 struct dma_chan *chan = dmadata->dma_chan;
395                 if (chan) {
396                         dmadata->frag_count = -1;
397                         dmaengine_terminate_all(chan);
398                         dma_release_channel(chan);
399                 }
400                 dev->dmadata[i].dma_chan = NULL;
401         }
402         return 0;
403 }
404 
405 static struct snd_soc_platform_driver txx9aclc_soc_platform = {
406         .probe          = txx9aclc_pcm_probe,
407         .remove         = txx9aclc_pcm_remove,
408         .ops            = &txx9aclc_pcm_ops,
409         .pcm_new        = txx9aclc_pcm_new,
410 };
411 
412 static int txx9aclc_soc_platform_probe(struct platform_device *pdev)
413 {
414         return snd_soc_register_platform(&pdev->dev, &txx9aclc_soc_platform);
415 }
416 
417 static int txx9aclc_soc_platform_remove(struct platform_device *pdev)
418 {
419         snd_soc_unregister_platform(&pdev->dev);
420         return 0;
421 }
422 
423 static struct platform_driver txx9aclc_pcm_driver = {
424         .driver = {
425                         .name = "txx9aclc-pcm-audio",
426         },
427 
428         .probe = txx9aclc_soc_platform_probe,
429         .remove = txx9aclc_soc_platform_remove,
430 };
431 
432 module_platform_driver(txx9aclc_pcm_driver);
433 
434 MODULE_AUTHOR("Atsushi Nemoto <anemo@mba.ocn.ne.jp>");
435 MODULE_DESCRIPTION("TXx9 ACLC Audio DMA driver");
436 MODULE_LICENSE("GPL");
437 

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