~ [ source navigation ] ~ [ diff markup ] ~ [ identifier search ] ~

TOMOYO Linux Cross Reference
Linux/sound/soc/txx9/txx9aclc.c

Version: ~ [ linux-5.10-rc5 ] ~ [ linux-5.9.10 ] ~ [ linux-5.8.18 ] ~ [ linux-5.7.19 ] ~ [ linux-5.6.19 ] ~ [ linux-5.5.19 ] ~ [ linux-5.4.79 ] ~ [ linux-5.3.18 ] ~ [ linux-5.2.21 ] ~ [ linux-5.1.21 ] ~ [ linux-5.0.21 ] ~ [ linux-4.20.17 ] ~ [ linux-4.19.159 ] ~ [ linux-4.18.20 ] ~ [ linux-4.17.19 ] ~ [ linux-4.16.18 ] ~ [ linux-4.15.18 ] ~ [ linux-4.14.208 ] ~ [ linux-4.13.16 ] ~ [ linux-4.12.14 ] ~ [ linux-4.11.12 ] ~ [ linux-4.10.17 ] ~ [ linux-4.9.245 ] ~ [ linux-4.8.17 ] ~ [ linux-4.7.10 ] ~ [ linux-4.6.7 ] ~ [ linux-4.5.7 ] ~ [ linux-4.4.245 ] ~ [ linux-4.3.6 ] ~ [ linux-4.2.8 ] ~ [ linux-4.1.52 ] ~ [ linux-4.0.9 ] ~ [ linux-3.19.8 ] ~ [ linux-3.18.140 ] ~ [ linux-3.17.8 ] ~ [ linux-3.16.85 ] ~ [ linux-3.15.10 ] ~ [ linux-3.14.79 ] ~ [ linux-3.13.11 ] ~ [ linux-3.12.74 ] ~ [ linux-3.11.10 ] ~ [ linux-3.10.108 ] ~ [ linux-2.6.32.71 ] ~ [ linux-2.6.0 ] ~ [ linux-2.4.37.11 ] ~ [ unix-v6-master ] ~ [ ccs-tools-1.8.5 ] ~ [ policy-sample ] ~
Architecture: ~ [ i386 ] ~ [ alpha ] ~ [ m68k ] ~ [ mips ] ~ [ ppc ] ~ [ sparc ] ~ [ sparc64 ] ~

  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 #define DRV_NAME "txx9aclc"
 27 
 28 static struct txx9aclc_soc_device {
 29         struct txx9aclc_dmadata dmadata[2];
 30 } txx9aclc_soc_device;
 31 
 32 /* REVISIT: How to find txx9aclc_drvdata from snd_ac97? */
 33 static struct txx9aclc_plat_drvdata *txx9aclc_drvdata;
 34 
 35 static int txx9aclc_dma_init(struct txx9aclc_soc_device *dev,
 36                              struct txx9aclc_dmadata *dmadata);
 37 
 38 static const struct snd_pcm_hardware txx9aclc_pcm_hardware = {
 39         /*
 40          * REVISIT: SNDRV_PCM_INFO_MMAP | SNDRV_PCM_INFO_MMAP_VALID
 41          * needs more works for noncoherent MIPS.
 42          */
 43         .info             = SNDRV_PCM_INFO_INTERLEAVED |
 44                             SNDRV_PCM_INFO_BATCH |
 45                             SNDRV_PCM_INFO_PAUSE,
 46         .period_bytes_min = 1024,
 47         .period_bytes_max = 8 * 1024,
 48         .periods_min      = 2,
 49         .periods_max      = 4096,
 50         .buffer_bytes_max = 32 * 1024,
 51 };
 52 
 53 static int txx9aclc_pcm_hw_params(struct snd_pcm_substream *substream,
 54                                   struct snd_pcm_hw_params *params)
 55 {
 56         struct snd_soc_pcm_runtime *rtd = snd_pcm_substream_chip(substream);
 57         struct snd_pcm_runtime *runtime = substream->runtime;
 58         struct snd_soc_component *component = snd_soc_rtdcom_lookup(rtd, DRV_NAME);
 59         struct txx9aclc_dmadata *dmadata = runtime->private_data;
 60         int ret;
 61 
 62         ret = snd_pcm_lib_malloc_pages(substream, params_buffer_bytes(params));
 63         if (ret < 0)
 64                 return ret;
 65 
 66         dev_dbg(component->dev,
 67                 "runtime->dma_area = %#lx dma_addr = %#lx dma_bytes = %zd "
 68                 "runtime->min_align %ld\n",
 69                 (unsigned long)runtime->dma_area,
 70                 (unsigned long)runtime->dma_addr, runtime->dma_bytes,
 71                 runtime->min_align);
 72         dev_dbg(component->dev,
 73                 "periods %d period_bytes %d stream %d\n",
 74                 params_periods(params), params_period_bytes(params),
 75                 substream->stream);
 76 
 77         dmadata->substream = substream;
 78         dmadata->pos = 0;
 79         return 0;
 80 }
 81 
 82 static int txx9aclc_pcm_hw_free(struct snd_pcm_substream *substream)
 83 {
 84         return snd_pcm_lib_free_pages(substream);
 85 }
 86 
 87 static int txx9aclc_pcm_prepare(struct snd_pcm_substream *substream)
 88 {
 89         struct snd_pcm_runtime *runtime = substream->runtime;
 90         struct txx9aclc_dmadata *dmadata = runtime->private_data;
 91 
 92         dmadata->dma_addr = runtime->dma_addr;
 93         dmadata->buffer_bytes = snd_pcm_lib_buffer_bytes(substream);
 94         dmadata->period_bytes = snd_pcm_lib_period_bytes(substream);
 95 
 96         if (dmadata->buffer_bytes == dmadata->period_bytes) {
 97                 dmadata->frag_bytes = dmadata->period_bytes >> 1;
 98                 dmadata->frags = 2;
 99         } else {
100                 dmadata->frag_bytes = dmadata->period_bytes;
101                 dmadata->frags = dmadata->buffer_bytes / dmadata->period_bytes;
102         }
103         dmadata->frag_count = 0;
104         dmadata->pos = 0;
105         return 0;
106 }
107 
108 static void txx9aclc_dma_complete(void *arg)
109 {
110         struct txx9aclc_dmadata *dmadata = arg;
111         unsigned long flags;
112 
113         /* dma completion handler cannot submit new operations */
114         spin_lock_irqsave(&dmadata->dma_lock, flags);
115         if (dmadata->frag_count >= 0) {
116                 dmadata->dmacount--;
117                 if (!WARN_ON(dmadata->dmacount < 0))
118                         tasklet_schedule(&dmadata->tasklet);
119         }
120         spin_unlock_irqrestore(&dmadata->dma_lock, flags);
121 }
122 
123 static struct dma_async_tx_descriptor *
124 txx9aclc_dma_submit(struct txx9aclc_dmadata *dmadata, dma_addr_t buf_dma_addr)
125 {
126         struct dma_chan *chan = dmadata->dma_chan;
127         struct dma_async_tx_descriptor *desc;
128         struct scatterlist sg;
129 
130         sg_init_table(&sg, 1);
131         sg_set_page(&sg, pfn_to_page(PFN_DOWN(buf_dma_addr)),
132                     dmadata->frag_bytes, buf_dma_addr & (PAGE_SIZE - 1));
133         sg_dma_address(&sg) = buf_dma_addr;
134         desc = dmaengine_prep_slave_sg(chan, &sg, 1,
135                 dmadata->substream->stream == SNDRV_PCM_STREAM_PLAYBACK ?
136                 DMA_MEM_TO_DEV : DMA_DEV_TO_MEM,
137                 DMA_PREP_INTERRUPT | DMA_CTRL_ACK);
138         if (!desc) {
139                 dev_err(&chan->dev->device, "cannot prepare slave dma\n");
140                 return NULL;
141         }
142         desc->callback = txx9aclc_dma_complete;
143         desc->callback_param = dmadata;
144         dmaengine_submit(desc);
145         return desc;
146 }
147 
148 #define NR_DMA_CHAIN            2
149 
150 static void txx9aclc_dma_tasklet(unsigned long data)
151 {
152         struct txx9aclc_dmadata *dmadata = (struct txx9aclc_dmadata *)data;
153         struct dma_chan *chan = dmadata->dma_chan;
154         struct dma_async_tx_descriptor *desc;
155         struct snd_pcm_substream *substream = dmadata->substream;
156         u32 ctlbit = substream->stream == SNDRV_PCM_STREAM_PLAYBACK ?
157                 ACCTL_AUDODMA : ACCTL_AUDIDMA;
158         int i;
159         unsigned long flags;
160 
161         spin_lock_irqsave(&dmadata->dma_lock, flags);
162         if (dmadata->frag_count < 0) {
163                 struct txx9aclc_plat_drvdata *drvdata = txx9aclc_drvdata;
164                 void __iomem *base = drvdata->base;
165 
166                 spin_unlock_irqrestore(&dmadata->dma_lock, flags);
167                 dmaengine_terminate_all(chan);
168                 /* first time */
169                 for (i = 0; i < NR_DMA_CHAIN; i++) {
170                         desc = txx9aclc_dma_submit(dmadata,
171                                 dmadata->dma_addr + i * dmadata->frag_bytes);
172                         if (!desc)
173                                 return;
174                 }
175                 dmadata->dmacount = NR_DMA_CHAIN;
176                 dma_async_issue_pending(chan);
177                 spin_lock_irqsave(&dmadata->dma_lock, flags);
178                 __raw_writel(ctlbit, base + ACCTLEN);
179                 dmadata->frag_count = NR_DMA_CHAIN % dmadata->frags;
180                 spin_unlock_irqrestore(&dmadata->dma_lock, flags);
181                 return;
182         }
183         if (WARN_ON(dmadata->dmacount >= NR_DMA_CHAIN)) {
184                 spin_unlock_irqrestore(&dmadata->dma_lock, flags);
185                 return;
186         }
187         while (dmadata->dmacount < NR_DMA_CHAIN) {
188                 dmadata->dmacount++;
189                 spin_unlock_irqrestore(&dmadata->dma_lock, flags);
190                 desc = txx9aclc_dma_submit(dmadata,
191                         dmadata->dma_addr +
192                         dmadata->frag_count * dmadata->frag_bytes);
193                 if (!desc)
194                         return;
195                 dma_async_issue_pending(chan);
196 
197                 spin_lock_irqsave(&dmadata->dma_lock, flags);
198                 dmadata->frag_count++;
199                 dmadata->frag_count %= dmadata->frags;
200                 dmadata->pos += dmadata->frag_bytes;
201                 dmadata->pos %= dmadata->buffer_bytes;
202                 if ((dmadata->frag_count * dmadata->frag_bytes) %
203                     dmadata->period_bytes == 0)
204                         snd_pcm_period_elapsed(substream);
205         }
206         spin_unlock_irqrestore(&dmadata->dma_lock, flags);
207 }
208 
209 static int txx9aclc_pcm_trigger(struct snd_pcm_substream *substream, int cmd)
210 {
211         struct txx9aclc_dmadata *dmadata = substream->runtime->private_data;
212         struct txx9aclc_plat_drvdata *drvdata = txx9aclc_drvdata;
213         void __iomem *base = drvdata->base;
214         unsigned long flags;
215         int ret = 0;
216         u32 ctlbit = substream->stream == SNDRV_PCM_STREAM_PLAYBACK ?
217                 ACCTL_AUDODMA : ACCTL_AUDIDMA;
218 
219         spin_lock_irqsave(&dmadata->dma_lock, flags);
220         switch (cmd) {
221         case SNDRV_PCM_TRIGGER_START:
222                 dmadata->frag_count = -1;
223                 tasklet_schedule(&dmadata->tasklet);
224                 break;
225         case SNDRV_PCM_TRIGGER_STOP:
226         case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
227         case SNDRV_PCM_TRIGGER_SUSPEND:
228                 __raw_writel(ctlbit, base + ACCTLDIS);
229                 break;
230         case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
231         case SNDRV_PCM_TRIGGER_RESUME:
232                 __raw_writel(ctlbit, base + ACCTLEN);
233                 break;
234         default:
235                 ret = -EINVAL;
236         }
237         spin_unlock_irqrestore(&dmadata->dma_lock, flags);
238         return ret;
239 }
240 
241 static snd_pcm_uframes_t
242 txx9aclc_pcm_pointer(struct snd_pcm_substream *substream)
243 {
244         struct txx9aclc_dmadata *dmadata = substream->runtime->private_data;
245 
246         return bytes_to_frames(substream->runtime, dmadata->pos);
247 }
248 
249 static int txx9aclc_pcm_open(struct snd_pcm_substream *substream)
250 {
251         struct txx9aclc_soc_device *dev = &txx9aclc_soc_device;
252         struct txx9aclc_dmadata *dmadata = &dev->dmadata[substream->stream];
253         int ret;
254 
255         ret = snd_soc_set_runtime_hwparams(substream, &txx9aclc_pcm_hardware);
256         if (ret)
257                 return ret;
258         /* ensure that buffer size is a multiple of period size */
259         ret = snd_pcm_hw_constraint_integer(substream->runtime,
260                                             SNDRV_PCM_HW_PARAM_PERIODS);
261         if (ret < 0)
262                 return ret;
263         substream->runtime->private_data = dmadata;
264         return 0;
265 }
266 
267 static int txx9aclc_pcm_close(struct snd_pcm_substream *substream)
268 {
269         struct txx9aclc_dmadata *dmadata = substream->runtime->private_data;
270         struct dma_chan *chan = dmadata->dma_chan;
271 
272         dmadata->frag_count = -1;
273         dmaengine_terminate_all(chan);
274         return 0;
275 }
276 
277 static const struct snd_pcm_ops txx9aclc_pcm_ops = {
278         .open           = txx9aclc_pcm_open,
279         .close          = txx9aclc_pcm_close,
280         .ioctl          = snd_pcm_lib_ioctl,
281         .hw_params      = txx9aclc_pcm_hw_params,
282         .hw_free        = txx9aclc_pcm_hw_free,
283         .prepare        = txx9aclc_pcm_prepare,
284         .trigger        = txx9aclc_pcm_trigger,
285         .pointer        = txx9aclc_pcm_pointer,
286 };
287 
288 static int txx9aclc_pcm_new(struct snd_soc_pcm_runtime *rtd)
289 {
290         struct snd_card *card = rtd->card->snd_card;
291         struct snd_soc_dai *dai = rtd->cpu_dai;
292         struct snd_pcm *pcm = rtd->pcm;
293         struct snd_soc_component *component = snd_soc_rtdcom_lookup(rtd, DRV_NAME);
294         struct platform_device *pdev = to_platform_device(component->dev);
295         struct txx9aclc_soc_device *dev;
296         struct resource *r;
297         int i;
298         int ret;
299 
300         /* at this point onwards the AC97 component has probed and this will be valid */
301         dev = snd_soc_dai_get_drvdata(dai);
302 
303         dev->dmadata[0].stream = SNDRV_PCM_STREAM_PLAYBACK;
304         dev->dmadata[1].stream = SNDRV_PCM_STREAM_CAPTURE;
305         for (i = 0; i < 2; i++) {
306                 r = platform_get_resource(pdev, IORESOURCE_DMA, i);
307                 if (!r) {
308                         ret = -EBUSY;
309                         goto exit;
310                 }
311                 dev->dmadata[i].dma_res = r;
312                 ret = txx9aclc_dma_init(dev, &dev->dmadata[i]);
313                 if (ret)
314                         goto exit;
315         }
316         return snd_pcm_lib_preallocate_pages_for_all(pcm, SNDRV_DMA_TYPE_DEV,
317                 card->dev, 64 * 1024, 4 * 1024 * 1024);
318 
319 exit:
320         for (i = 0; i < 2; i++) {
321                 if (dev->dmadata[i].dma_chan)
322                         dma_release_channel(dev->dmadata[i].dma_chan);
323                 dev->dmadata[i].dma_chan = NULL;
324         }
325         return ret;
326 }
327 
328 static bool filter(struct dma_chan *chan, void *param)
329 {
330         struct txx9aclc_dmadata *dmadata = param;
331         char *devname;
332         bool found = false;
333 
334         devname = kasprintf(GFP_KERNEL, "%s.%d", dmadata->dma_res->name,
335                 (int)dmadata->dma_res->start);
336         if (strcmp(dev_name(chan->device->dev), devname) == 0) {
337                 chan->private = &dmadata->dma_slave;
338                 found = true;
339         }
340         kfree(devname);
341         return found;
342 }
343 
344 static int txx9aclc_dma_init(struct txx9aclc_soc_device *dev,
345                              struct txx9aclc_dmadata *dmadata)
346 {
347         struct txx9aclc_plat_drvdata *drvdata = txx9aclc_drvdata;
348         struct txx9dmac_slave *ds = &dmadata->dma_slave;
349         dma_cap_mask_t mask;
350 
351         spin_lock_init(&dmadata->dma_lock);
352 
353         ds->reg_width = sizeof(u32);
354         if (dmadata->stream == SNDRV_PCM_STREAM_PLAYBACK) {
355                 ds->tx_reg = drvdata->physbase + ACAUDODAT;
356                 ds->rx_reg = 0;
357         } else {
358                 ds->tx_reg = 0;
359                 ds->rx_reg = drvdata->physbase + ACAUDIDAT;
360         }
361 
362         /* Try to grab a DMA channel */
363         dma_cap_zero(mask);
364         dma_cap_set(DMA_SLAVE, mask);
365         dmadata->dma_chan = dma_request_channel(mask, filter, dmadata);
366         if (!dmadata->dma_chan) {
367                 printk(KERN_ERR
368                         "DMA channel for %s is not available\n",
369                         dmadata->stream == SNDRV_PCM_STREAM_PLAYBACK ?
370                         "playback" : "capture");
371                 return -EBUSY;
372         }
373         tasklet_init(&dmadata->tasklet, txx9aclc_dma_tasklet,
374                      (unsigned long)dmadata);
375         return 0;
376 }
377 
378 static int txx9aclc_pcm_probe(struct snd_soc_component *component)
379 {
380         snd_soc_component_set_drvdata(component, &txx9aclc_soc_device);
381         return 0;
382 }
383 
384 static void txx9aclc_pcm_remove(struct snd_soc_component *component)
385 {
386         struct txx9aclc_soc_device *dev = snd_soc_component_get_drvdata(component);
387         struct txx9aclc_plat_drvdata *drvdata = txx9aclc_drvdata;
388         void __iomem *base = drvdata->base;
389         int i;
390 
391         /* disable all FIFO DMAs */
392         __raw_writel(ACCTL_AUDODMA | ACCTL_AUDIDMA, base + ACCTLDIS);
393         /* dummy R/W to clear pending DMAREQ if any */
394         __raw_writel(__raw_readl(base + ACAUDIDAT), base + ACAUDODAT);
395 
396         for (i = 0; i < 2; i++) {
397                 struct txx9aclc_dmadata *dmadata = &dev->dmadata[i];
398                 struct dma_chan *chan = dmadata->dma_chan;
399 
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 }
408 
409 static const struct snd_soc_component_driver txx9aclc_soc_component = {
410         .name           = DRV_NAME,
411         .probe          = txx9aclc_pcm_probe,
412         .remove         = txx9aclc_pcm_remove,
413         .ops            = &txx9aclc_pcm_ops,
414         .pcm_new        = txx9aclc_pcm_new,
415 };
416 
417 static int txx9aclc_soc_platform_probe(struct platform_device *pdev)
418 {
419         return devm_snd_soc_register_component(&pdev->dev,
420                                         &txx9aclc_soc_component, NULL, 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 };
430 
431 module_platform_driver(txx9aclc_pcm_driver);
432 
433 MODULE_AUTHOR("Atsushi Nemoto <anemo@mba.ocn.ne.jp>");
434 MODULE_DESCRIPTION("TXx9 ACLC Audio DMA driver");
435 MODULE_LICENSE("GPL");
436 

~ [ source navigation ] ~ [ diff markup ] ~ [ identifier search ] ~

kernel.org | git.kernel.org | LWN.net | Project Home | Wiki (Japanese) | Wiki (English) | SVN repository | Mail admin

Linux® is a registered trademark of Linus Torvalds in the United States and other countries.
TOMOYO® is a registered trademark of NTT DATA CORPORATION.

osdn.jp