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Linux/sound/soc/txx9/txx9aclc.c

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  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 <sound/core.h>
 19 #include <sound/pcm.h>
 20 #include <sound/pcm_params.h>
 21 #include <sound/soc.h>
 22 #include "txx9aclc.h"
 23 
 24 static const struct snd_pcm_hardware txx9aclc_pcm_hardware = {
 25         /*
 26          * REVISIT: SNDRV_PCM_INFO_MMAP | SNDRV_PCM_INFO_MMAP_VALID
 27          * needs more works for noncoherent MIPS.
 28          */
 29         .info             = SNDRV_PCM_INFO_INTERLEAVED |
 30                             SNDRV_PCM_INFO_BATCH |
 31                             SNDRV_PCM_INFO_PAUSE,
 32 #ifdef __BIG_ENDIAN
 33         .formats          = SNDRV_PCM_FMTBIT_S16_BE,
 34 #else
 35         .formats          = SNDRV_PCM_FMTBIT_S16_LE,
 36 #endif
 37         .period_bytes_min = 1024,
 38         .period_bytes_max = 8 * 1024,
 39         .periods_min      = 2,
 40         .periods_max      = 4096,
 41         .buffer_bytes_max = 32 * 1024,
 42 };
 43 
 44 static int txx9aclc_pcm_hw_params(struct snd_pcm_substream *substream,
 45                                   struct snd_pcm_hw_params *params)
 46 {
 47         struct snd_soc_pcm_runtime *rtd = snd_pcm_substream_chip(substream);
 48         struct snd_soc_device *socdev = rtd->socdev;
 49         struct snd_pcm_runtime *runtime = substream->runtime;
 50         struct txx9aclc_dmadata *dmadata = runtime->private_data;
 51         int ret;
 52 
 53         ret = snd_pcm_lib_malloc_pages(substream, params_buffer_bytes(params));
 54         if (ret < 0)
 55                 return ret;
 56 
 57         dev_dbg(socdev->dev,
 58                 "runtime->dma_area = %#lx dma_addr = %#lx dma_bytes = %zd "
 59                 "runtime->min_align %ld\n",
 60                 (unsigned long)runtime->dma_area,
 61                 (unsigned long)runtime->dma_addr, runtime->dma_bytes,
 62                 runtime->min_align);
 63         dev_dbg(socdev->dev,
 64                 "periods %d period_bytes %d stream %d\n",
 65                 params_periods(params), params_period_bytes(params),
 66                 substream->stream);
 67 
 68         dmadata->substream = substream;
 69         dmadata->pos = 0;
 70         return 0;
 71 }
 72 
 73 static int txx9aclc_pcm_hw_free(struct snd_pcm_substream *substream)
 74 {
 75         return snd_pcm_lib_free_pages(substream);
 76 }
 77 
 78 static int txx9aclc_pcm_prepare(struct snd_pcm_substream *substream)
 79 {
 80         struct snd_pcm_runtime *runtime = substream->runtime;
 81         struct txx9aclc_dmadata *dmadata = runtime->private_data;
 82 
 83         dmadata->dma_addr = runtime->dma_addr;
 84         dmadata->buffer_bytes = snd_pcm_lib_buffer_bytes(substream);
 85         dmadata->period_bytes = snd_pcm_lib_period_bytes(substream);
 86 
 87         if (dmadata->buffer_bytes == dmadata->period_bytes) {
 88                 dmadata->frag_bytes = dmadata->period_bytes >> 1;
 89                 dmadata->frags = 2;
 90         } else {
 91                 dmadata->frag_bytes = dmadata->period_bytes;
 92                 dmadata->frags = dmadata->buffer_bytes / dmadata->period_bytes;
 93         }
 94         dmadata->frag_count = 0;
 95         dmadata->pos = 0;
 96         return 0;
 97 }
 98 
 99 static void txx9aclc_dma_complete(void *arg)
100 {
101         struct txx9aclc_dmadata *dmadata = arg;
102         unsigned long flags;
103 
104         /* dma completion handler cannot submit new operations */
105         spin_lock_irqsave(&dmadata->dma_lock, flags);
106         if (dmadata->frag_count >= 0) {
107                 dmadata->dmacount--;
108                 BUG_ON(dmadata->dmacount < 0);
109                 tasklet_schedule(&dmadata->tasklet);
110         }
111         spin_unlock_irqrestore(&dmadata->dma_lock, flags);
112 }
113 
114 static struct dma_async_tx_descriptor *
115 txx9aclc_dma_submit(struct txx9aclc_dmadata *dmadata, dma_addr_t buf_dma_addr)
116 {
117         struct dma_chan *chan = dmadata->dma_chan;
118         struct dma_async_tx_descriptor *desc;
119         struct scatterlist sg;
120 
121         sg_init_table(&sg, 1);
122         sg_set_page(&sg, pfn_to_page(PFN_DOWN(buf_dma_addr)),
123                     dmadata->frag_bytes, buf_dma_addr & (PAGE_SIZE - 1));
124         sg_dma_address(&sg) = buf_dma_addr;
125         desc = chan->device->device_prep_slave_sg(chan, &sg, 1,
126                 dmadata->substream->stream == SNDRV_PCM_STREAM_PLAYBACK ?
127                 DMA_TO_DEVICE : DMA_FROM_DEVICE,
128                 DMA_PREP_INTERRUPT | DMA_CTRL_ACK);
129         if (!desc) {
130                 dev_err(&chan->dev->device, "cannot prepare slave dma\n");
131                 return NULL;
132         }
133         desc->callback = txx9aclc_dma_complete;
134         desc->callback_param = dmadata;
135         desc->tx_submit(desc);
136         return desc;
137 }
138 
139 #define NR_DMA_CHAIN            2
140 
141 static void txx9aclc_dma_tasklet(unsigned long data)
142 {
143         struct txx9aclc_dmadata *dmadata = (struct txx9aclc_dmadata *)data;
144         struct dma_chan *chan = dmadata->dma_chan;
145         struct dma_async_tx_descriptor *desc;
146         struct snd_pcm_substream *substream = dmadata->substream;
147         u32 ctlbit = substream->stream == SNDRV_PCM_STREAM_PLAYBACK ?
148                 ACCTL_AUDODMA : ACCTL_AUDIDMA;
149         int i;
150         unsigned long flags;
151 
152         spin_lock_irqsave(&dmadata->dma_lock, flags);
153         if (dmadata->frag_count < 0) {
154                 struct txx9aclc_soc_device *dev =
155                         container_of(dmadata, struct txx9aclc_soc_device,
156                                      dmadata[substream->stream]);
157                 struct txx9aclc_plat_drvdata *drvdata =
158                         txx9aclc_get_plat_drvdata(dev);
159                 void __iomem *base = drvdata->base;
160 
161                 spin_unlock_irqrestore(&dmadata->dma_lock, flags);
162                 chan->device->device_terminate_all(chan);
163                 /* first time */
164                 for (i = 0; i < NR_DMA_CHAIN; i++) {
165                         desc = txx9aclc_dma_submit(dmadata,
166                                 dmadata->dma_addr + i * dmadata->frag_bytes);
167                         if (!desc)
168                                 return;
169                 }
170                 dmadata->dmacount = NR_DMA_CHAIN;
171                 chan->device->device_issue_pending(chan);
172                 spin_lock_irqsave(&dmadata->dma_lock, flags);
173                 __raw_writel(ctlbit, base + ACCTLEN);
174                 dmadata->frag_count = NR_DMA_CHAIN % dmadata->frags;
175                 spin_unlock_irqrestore(&dmadata->dma_lock, flags);
176                 return;
177         }
178         BUG_ON(dmadata->dmacount >= NR_DMA_CHAIN);
179         while (dmadata->dmacount < NR_DMA_CHAIN) {
180                 dmadata->dmacount++;
181                 spin_unlock_irqrestore(&dmadata->dma_lock, flags);
182                 desc = txx9aclc_dma_submit(dmadata,
183                         dmadata->dma_addr +
184                         dmadata->frag_count * dmadata->frag_bytes);
185                 if (!desc)
186                         return;
187                 chan->device->device_issue_pending(chan);
188 
189                 spin_lock_irqsave(&dmadata->dma_lock, flags);
190                 dmadata->frag_count++;
191                 dmadata->frag_count %= dmadata->frags;
192                 dmadata->pos += dmadata->frag_bytes;
193                 dmadata->pos %= dmadata->buffer_bytes;
194                 if ((dmadata->frag_count * dmadata->frag_bytes) %
195                     dmadata->period_bytes == 0)
196                         snd_pcm_period_elapsed(substream);
197         }
198         spin_unlock_irqrestore(&dmadata->dma_lock, flags);
199 }
200 
201 static int txx9aclc_pcm_trigger(struct snd_pcm_substream *substream, int cmd)
202 {
203         struct txx9aclc_dmadata *dmadata = substream->runtime->private_data;
204         struct snd_soc_pcm_runtime *rtd = substream->private_data;
205         struct txx9aclc_soc_device *dev =
206                 container_of(rtd->socdev, struct txx9aclc_soc_device, soc_dev);
207         struct txx9aclc_plat_drvdata *drvdata = txx9aclc_get_plat_drvdata(dev);
208         void __iomem *base = drvdata->base;
209         unsigned long flags;
210         int ret = 0;
211         u32 ctlbit = substream->stream == SNDRV_PCM_STREAM_PLAYBACK ?
212                 ACCTL_AUDODMA : ACCTL_AUDIDMA;
213 
214         spin_lock_irqsave(&dmadata->dma_lock, flags);
215         switch (cmd) {
216         case SNDRV_PCM_TRIGGER_START:
217                 dmadata->frag_count = -1;
218                 tasklet_schedule(&dmadata->tasklet);
219                 break;
220         case SNDRV_PCM_TRIGGER_STOP:
221         case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
222         case SNDRV_PCM_TRIGGER_SUSPEND:
223                 __raw_writel(ctlbit, base + ACCTLDIS);
224                 break;
225         case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
226         case SNDRV_PCM_TRIGGER_RESUME:
227                 __raw_writel(ctlbit, base + ACCTLEN);
228                 break;
229         default:
230                 ret = -EINVAL;
231         }
232         spin_unlock_irqrestore(&dmadata->dma_lock, flags);
233         return ret;
234 }
235 
236 static snd_pcm_uframes_t
237 txx9aclc_pcm_pointer(struct snd_pcm_substream *substream)
238 {
239         struct txx9aclc_dmadata *dmadata = substream->runtime->private_data;
240 
241         return bytes_to_frames(substream->runtime, dmadata->pos);
242 }
243 
244 static int txx9aclc_pcm_open(struct snd_pcm_substream *substream)
245 {
246         struct snd_soc_pcm_runtime *rtd = substream->private_data;
247         struct txx9aclc_soc_device *dev =
248                 container_of(rtd->socdev, struct txx9aclc_soc_device, soc_dev);
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         chan->device->device_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_card *card, struct snd_soc_dai *dai,
291                             struct snd_pcm *pcm)
292 {
293         return snd_pcm_lib_preallocate_pages_for_all(pcm, SNDRV_DMA_TYPE_DEV,
294                 card->dev, 64 * 1024, 4 * 1024 * 1024);
295 }
296 
297 static bool filter(struct dma_chan *chan, void *param)
298 {
299         struct txx9aclc_dmadata *dmadata = param;
300         char *devname;
301         bool found = false;
302 
303         devname = kasprintf(GFP_KERNEL, "%s.%d", dmadata->dma_res->name,
304                 (int)dmadata->dma_res->start);
305         if (strcmp(dev_name(chan->device->dev), devname) == 0) {
306                 chan->private = &dmadata->dma_slave;
307                 found = true;
308         }
309         kfree(devname);
310         return found;
311 }
312 
313 static int txx9aclc_dma_init(struct txx9aclc_soc_device *dev,
314                              struct txx9aclc_dmadata *dmadata)
315 {
316         struct txx9aclc_plat_drvdata *drvdata = txx9aclc_get_plat_drvdata(dev);
317         struct txx9dmac_slave *ds = &dmadata->dma_slave;
318         dma_cap_mask_t mask;
319 
320         spin_lock_init(&dmadata->dma_lock);
321 
322         ds->reg_width = sizeof(u32);
323         if (dmadata->stream == SNDRV_PCM_STREAM_PLAYBACK) {
324                 ds->tx_reg = drvdata->physbase + ACAUDODAT;
325                 ds->rx_reg = 0;
326         } else {
327                 ds->tx_reg = 0;
328                 ds->rx_reg = drvdata->physbase + ACAUDIDAT;
329         }
330 
331         /* Try to grab a DMA channel */
332         dma_cap_zero(mask);
333         dma_cap_set(DMA_SLAVE, mask);
334         dmadata->dma_chan = dma_request_channel(mask, filter, dmadata);
335         if (!dmadata->dma_chan) {
336                 dev_err(dev->soc_dev.dev,
337                         "DMA channel for %s is not available\n",
338                         dmadata->stream == SNDRV_PCM_STREAM_PLAYBACK ?
339                         "playback" : "capture");
340                 return -EBUSY;
341         }
342         tasklet_init(&dmadata->tasklet, txx9aclc_dma_tasklet,
343                      (unsigned long)dmadata);
344         return 0;
345 }
346 
347 static int txx9aclc_pcm_probe(struct platform_device *pdev)
348 {
349         struct snd_soc_device *socdev = platform_get_drvdata(pdev);
350         struct txx9aclc_soc_device *dev =
351                 container_of(socdev, struct txx9aclc_soc_device, soc_dev);
352         struct resource *r;
353         int i;
354         int ret;
355 
356         dev->dmadata[0].stream = SNDRV_PCM_STREAM_PLAYBACK;
357         dev->dmadata[1].stream = SNDRV_PCM_STREAM_CAPTURE;
358         for (i = 0; i < 2; i++) {
359                 r = platform_get_resource(dev->aclc_pdev, IORESOURCE_DMA, i);
360                 if (!r) {
361                         ret = -EBUSY;
362                         goto exit;
363                 }
364                 dev->dmadata[i].dma_res = r;
365                 ret = txx9aclc_dma_init(dev, &dev->dmadata[i]);
366                 if (ret)
367                         goto exit;
368         }
369         return 0;
370 
371 exit:
372         for (i = 0; i < 2; i++) {
373                 if (dev->dmadata[i].dma_chan)
374                         dma_release_channel(dev->dmadata[i].dma_chan);
375                 dev->dmadata[i].dma_chan = NULL;
376         }
377         return ret;
378 }
379 
380 static int txx9aclc_pcm_remove(struct platform_device *pdev)
381 {
382         struct snd_soc_device *socdev = platform_get_drvdata(pdev);
383         struct txx9aclc_soc_device *dev =
384                 container_of(socdev, struct txx9aclc_soc_device, soc_dev);
385         struct txx9aclc_plat_drvdata *drvdata = txx9aclc_get_plat_drvdata(dev);
386         void __iomem *base = drvdata->base;
387         int i;
388 
389         /* disable all FIFO DMAs */
390         __raw_writel(ACCTL_AUDODMA | ACCTL_AUDIDMA, base + ACCTLDIS);
391         /* dummy R/W to clear pending DMAREQ if any */
392         __raw_writel(__raw_readl(base + ACAUDIDAT), base + ACAUDODAT);
393 
394         for (i = 0; i < 2; i++) {
395                 struct txx9aclc_dmadata *dmadata = &dev->dmadata[i];
396                 struct dma_chan *chan = dmadata->dma_chan;
397                 if (chan) {
398                         dmadata->frag_count = -1;
399                         chan->device->device_terminate_all(chan);
400                         dma_release_channel(chan);
401                 }
402                 dev->dmadata[i].dma_chan = NULL;
403         }
404         return 0;
405 }
406 
407 struct snd_soc_platform txx9aclc_soc_platform = {
408         .name           = "txx9aclc-audio",
409         .probe          = txx9aclc_pcm_probe,
410         .remove         = txx9aclc_pcm_remove,
411         .pcm_ops        = &txx9aclc_pcm_ops,
412         .pcm_new        = txx9aclc_pcm_new,
413         .pcm_free       = txx9aclc_pcm_free_dma_buffers,
414 };
415 EXPORT_SYMBOL_GPL(txx9aclc_soc_platform);
416 
417 static int __init txx9aclc_soc_platform_init(void)
418 {
419         return snd_soc_register_platform(&txx9aclc_soc_platform);
420 }
421 
422 static void __exit txx9aclc_soc_platform_exit(void)
423 {
424         snd_soc_unregister_platform(&txx9aclc_soc_platform);
425 }
426 
427 module_init(txx9aclc_soc_platform_init);
428 module_exit(txx9aclc_soc_platform_exit);
429 
430 MODULE_AUTHOR("Atsushi Nemoto <anemo@mba.ocn.ne.jp>");
431 MODULE_DESCRIPTION("TXx9 ACLC Audio DMA driver");
432 MODULE_LICENSE("GPL");
433 

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