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TOMOYO Linux Cross Reference
Linux/sound/soc/sh/siu_pcm.c

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  1 /*
  2  * siu_pcm.c - ALSA driver for Renesas SH7343, SH7722 SIU peripheral.
  3  *
  4  * Copyright (C) 2009-2010 Guennadi Liakhovetski <g.liakhovetski@gmx.de>
  5  * Copyright (C) 2006 Carlos Munoz <carlos@kenati.com>
  6  *
  7  * This program is free software; you can redistribute it and/or modify
  8  * it under the terms of the GNU General Public License as published by
  9  * the Free Software Foundation; either version 2 of the License, or
 10  * (at your option) any later version.
 11  *
 12  * This program is distributed in the hope that it will be useful,
 13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
 14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 15  * GNU General Public License for more details.
 16  *
 17  * You should have received a copy of the GNU General Public License
 18  * along with this program; if not, write to the Free Software
 19  * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 20  */
 21 #include <linux/delay.h>
 22 #include <linux/dma-mapping.h>
 23 #include <linux/dmaengine.h>
 24 #include <linux/interrupt.h>
 25 #include <linux/module.h>
 26 #include <linux/platform_device.h>
 27 
 28 #include <sound/control.h>
 29 #include <sound/core.h>
 30 #include <sound/pcm.h>
 31 #include <sound/pcm_params.h>
 32 #include <sound/soc.h>
 33 
 34 #include <asm/siu.h>
 35 
 36 #include "siu.h"
 37 
 38 #define GET_MAX_PERIODS(buf_bytes, period_bytes) \
 39                                 ((buf_bytes) / (period_bytes))
 40 #define PERIOD_OFFSET(buf_addr, period_num, period_bytes) \
 41                                 ((buf_addr) + ((period_num) * (period_bytes)))
 42 
 43 #define RWF_STM_RD              0x01            /* Read in progress */
 44 #define RWF_STM_WT              0x02            /* Write in progress */
 45 
 46 struct siu_port *siu_ports[SIU_PORT_NUM];
 47 
 48 /* transfersize is number of u32 dma transfers per period */
 49 static int siu_pcm_stmwrite_stop(struct siu_port *port_info)
 50 {
 51         struct siu_info *info = siu_i2s_data;
 52         u32 __iomem *base = info->reg;
 53         struct siu_stream *siu_stream = &port_info->playback;
 54         u32 stfifo;
 55 
 56         if (!siu_stream->rw_flg)
 57                 return -EPERM;
 58 
 59         /* output FIFO disable */
 60         stfifo = siu_read32(base + SIU_STFIFO);
 61         siu_write32(base + SIU_STFIFO, stfifo & ~0x0c180c18);
 62         pr_debug("%s: STFIFO %x -> %x\n", __func__,
 63                  stfifo, stfifo & ~0x0c180c18);
 64 
 65         /* during stmwrite clear */
 66         siu_stream->rw_flg = 0;
 67 
 68         return 0;
 69 }
 70 
 71 static int siu_pcm_stmwrite_start(struct siu_port *port_info)
 72 {
 73         struct siu_stream *siu_stream = &port_info->playback;
 74 
 75         if (siu_stream->rw_flg)
 76                 return -EPERM;
 77 
 78         /* Current period in buffer */
 79         port_info->playback.cur_period = 0;
 80 
 81         /* during stmwrite flag set */
 82         siu_stream->rw_flg = RWF_STM_WT;
 83 
 84         /* DMA transfer start */
 85         tasklet_schedule(&siu_stream->tasklet);
 86 
 87         return 0;
 88 }
 89 
 90 static void siu_dma_tx_complete(void *arg)
 91 {
 92         struct siu_stream *siu_stream = arg;
 93 
 94         if (!siu_stream->rw_flg)
 95                 return;
 96 
 97         /* Update completed period count */
 98         if (++siu_stream->cur_period >=
 99             GET_MAX_PERIODS(siu_stream->buf_bytes,
100                             siu_stream->period_bytes))
101                 siu_stream->cur_period = 0;
102 
103         pr_debug("%s: done period #%d (%u/%u bytes), cookie %d\n",
104                 __func__, siu_stream->cur_period,
105                 siu_stream->cur_period * siu_stream->period_bytes,
106                 siu_stream->buf_bytes, siu_stream->cookie);
107 
108         tasklet_schedule(&siu_stream->tasklet);
109 
110         /* Notify alsa: a period is done */
111         snd_pcm_period_elapsed(siu_stream->substream);
112 }
113 
114 static int siu_pcm_wr_set(struct siu_port *port_info,
115                           dma_addr_t buff, u32 size)
116 {
117         struct siu_info *info = siu_i2s_data;
118         u32 __iomem *base = info->reg;
119         struct siu_stream *siu_stream = &port_info->playback;
120         struct snd_pcm_substream *substream = siu_stream->substream;
121         struct device *dev = substream->pcm->card->dev;
122         struct dma_async_tx_descriptor *desc;
123         dma_cookie_t cookie;
124         struct scatterlist sg;
125         u32 stfifo;
126 
127         sg_init_table(&sg, 1);
128         sg_set_page(&sg, pfn_to_page(PFN_DOWN(buff)),
129                     size, offset_in_page(buff));
130         sg_dma_len(&sg) = size;
131         sg_dma_address(&sg) = buff;
132 
133         desc = dmaengine_prep_slave_sg(siu_stream->chan,
134                 &sg, 1, DMA_MEM_TO_DEV, DMA_PREP_INTERRUPT | DMA_CTRL_ACK);
135         if (!desc) {
136                 dev_err(dev, "Failed to allocate a dma descriptor\n");
137                 return -ENOMEM;
138         }
139 
140         desc->callback = siu_dma_tx_complete;
141         desc->callback_param = siu_stream;
142         cookie = desc->tx_submit(desc);
143         if (cookie < 0) {
144                 dev_err(dev, "Failed to submit a dma transfer\n");
145                 return cookie;
146         }
147 
148         siu_stream->tx_desc = desc;
149         siu_stream->cookie = cookie;
150 
151         dma_async_issue_pending(siu_stream->chan);
152 
153         /* only output FIFO enable */
154         stfifo = siu_read32(base + SIU_STFIFO);
155         siu_write32(base + SIU_STFIFO, stfifo | (port_info->stfifo & 0x0c180c18));
156         dev_dbg(dev, "%s: STFIFO %x -> %x\n", __func__,
157                 stfifo, stfifo | (port_info->stfifo & 0x0c180c18));
158 
159         return 0;
160 }
161 
162 static int siu_pcm_rd_set(struct siu_port *port_info,
163                           dma_addr_t buff, size_t size)
164 {
165         struct siu_info *info = siu_i2s_data;
166         u32 __iomem *base = info->reg;
167         struct siu_stream *siu_stream = &port_info->capture;
168         struct snd_pcm_substream *substream = siu_stream->substream;
169         struct device *dev = substream->pcm->card->dev;
170         struct dma_async_tx_descriptor *desc;
171         dma_cookie_t cookie;
172         struct scatterlist sg;
173         u32 stfifo;
174 
175         dev_dbg(dev, "%s: %u@%llx\n", __func__, size, (unsigned long long)buff);
176 
177         sg_init_table(&sg, 1);
178         sg_set_page(&sg, pfn_to_page(PFN_DOWN(buff)),
179                     size, offset_in_page(buff));
180         sg_dma_len(&sg) = size;
181         sg_dma_address(&sg) = buff;
182 
183         desc = dmaengine_prep_slave_sg(siu_stream->chan,
184                 &sg, 1, DMA_DEV_TO_MEM, DMA_PREP_INTERRUPT | DMA_CTRL_ACK);
185         if (!desc) {
186                 dev_err(dev, "Failed to allocate dma descriptor\n");
187                 return -ENOMEM;
188         }
189 
190         desc->callback = siu_dma_tx_complete;
191         desc->callback_param = siu_stream;
192         cookie = desc->tx_submit(desc);
193         if (cookie < 0) {
194                 dev_err(dev, "Failed to submit dma descriptor\n");
195                 return cookie;
196         }
197 
198         siu_stream->tx_desc = desc;
199         siu_stream->cookie = cookie;
200 
201         dma_async_issue_pending(siu_stream->chan);
202 
203         /* only input FIFO enable */
204         stfifo = siu_read32(base + SIU_STFIFO);
205         siu_write32(base + SIU_STFIFO, siu_read32(base + SIU_STFIFO) |
206                     (port_info->stfifo & 0x13071307));
207         dev_dbg(dev, "%s: STFIFO %x -> %x\n", __func__,
208                 stfifo, stfifo | (port_info->stfifo & 0x13071307));
209 
210         return 0;
211 }
212 
213 static void siu_io_tasklet(unsigned long data)
214 {
215         struct siu_stream *siu_stream = (struct siu_stream *)data;
216         struct snd_pcm_substream *substream = siu_stream->substream;
217         struct device *dev = substream->pcm->card->dev;
218         struct snd_pcm_runtime *rt = substream->runtime;
219         struct siu_port *port_info = siu_port_info(substream);
220 
221         dev_dbg(dev, "%s: flags %x\n", __func__, siu_stream->rw_flg);
222 
223         if (!siu_stream->rw_flg) {
224                 dev_dbg(dev, "%s: stream inactive\n", __func__);
225                 return;
226         }
227 
228         if (substream->stream == SNDRV_PCM_STREAM_CAPTURE) {
229                 dma_addr_t buff;
230                 size_t count;
231                 u8 *virt;
232 
233                 buff = (dma_addr_t)PERIOD_OFFSET(rt->dma_addr,
234                                                 siu_stream->cur_period,
235                                                 siu_stream->period_bytes);
236                 virt = PERIOD_OFFSET(rt->dma_area,
237                                      siu_stream->cur_period,
238                                      siu_stream->period_bytes);
239                 count = siu_stream->period_bytes;
240 
241                 /* DMA transfer start */
242                 siu_pcm_rd_set(port_info, buff, count);
243         } else {
244                 siu_pcm_wr_set(port_info,
245                                (dma_addr_t)PERIOD_OFFSET(rt->dma_addr,
246                                                 siu_stream->cur_period,
247                                                 siu_stream->period_bytes),
248                                siu_stream->period_bytes);
249         }
250 }
251 
252 /* Capture */
253 static int siu_pcm_stmread_start(struct siu_port *port_info)
254 {
255         struct siu_stream *siu_stream = &port_info->capture;
256 
257         if (siu_stream->xfer_cnt > 0x1000000)
258                 return -EINVAL;
259         if (siu_stream->rw_flg)
260                 return -EPERM;
261 
262         /* Current period in buffer */
263         siu_stream->cur_period = 0;
264 
265         /* during stmread flag set */
266         siu_stream->rw_flg = RWF_STM_RD;
267 
268         tasklet_schedule(&siu_stream->tasklet);
269 
270         return 0;
271 }
272 
273 static int siu_pcm_stmread_stop(struct siu_port *port_info)
274 {
275         struct siu_info *info = siu_i2s_data;
276         u32 __iomem *base = info->reg;
277         struct siu_stream *siu_stream = &port_info->capture;
278         struct device *dev = siu_stream->substream->pcm->card->dev;
279         u32 stfifo;
280 
281         if (!siu_stream->rw_flg)
282                 return -EPERM;
283 
284         /* input FIFO disable */
285         stfifo = siu_read32(base + SIU_STFIFO);
286         siu_write32(base + SIU_STFIFO, stfifo & ~0x13071307);
287         dev_dbg(dev, "%s: STFIFO %x -> %x\n", __func__,
288                 stfifo, stfifo & ~0x13071307);
289 
290         /* during stmread flag clear */
291         siu_stream->rw_flg = 0;
292 
293         return 0;
294 }
295 
296 static int siu_pcm_hw_params(struct snd_pcm_substream *ss,
297                              struct snd_pcm_hw_params *hw_params)
298 {
299         struct siu_info *info = siu_i2s_data;
300         struct device *dev = ss->pcm->card->dev;
301         int ret;
302 
303         dev_dbg(dev, "%s: port=%d\n", __func__, info->port_id);
304 
305         ret = snd_pcm_lib_malloc_pages(ss, params_buffer_bytes(hw_params));
306         if (ret < 0)
307                 dev_err(dev, "snd_pcm_lib_malloc_pages() failed\n");
308 
309         return ret;
310 }
311 
312 static int siu_pcm_hw_free(struct snd_pcm_substream *ss)
313 {
314         struct siu_info *info = siu_i2s_data;
315         struct siu_port *port_info = siu_port_info(ss);
316         struct device *dev = ss->pcm->card->dev;
317         struct siu_stream *siu_stream;
318 
319         if (ss->stream == SNDRV_PCM_STREAM_PLAYBACK)
320                 siu_stream = &port_info->playback;
321         else
322                 siu_stream = &port_info->capture;
323 
324         dev_dbg(dev, "%s: port=%d\n", __func__, info->port_id);
325 
326         return snd_pcm_lib_free_pages(ss);
327 }
328 
329 static bool filter(struct dma_chan *chan, void *slave)
330 {
331         struct sh_dmae_slave *param = slave;
332 
333         pr_debug("%s: slave ID %d\n", __func__, param->shdma_slave.slave_id);
334 
335         chan->private = &param->shdma_slave;
336         return true;
337 }
338 
339 static int siu_pcm_open(struct snd_pcm_substream *ss)
340 {
341         /* Playback / Capture */
342         struct snd_soc_pcm_runtime *rtd = ss->private_data;
343         struct siu_platform *pdata = rtd->platform->dev->platform_data;
344         struct siu_info *info = siu_i2s_data;
345         struct siu_port *port_info = siu_port_info(ss);
346         struct siu_stream *siu_stream;
347         u32 port = info->port_id;
348         struct device *dev = ss->pcm->card->dev;
349         dma_cap_mask_t mask;
350         struct sh_dmae_slave *param;
351 
352         dma_cap_zero(mask);
353         dma_cap_set(DMA_SLAVE, mask);
354 
355         dev_dbg(dev, "%s, port=%d@%p\n", __func__, port, port_info);
356 
357         if (ss->stream == SNDRV_PCM_STREAM_PLAYBACK) {
358                 siu_stream = &port_info->playback;
359                 param = &siu_stream->param;
360                 param->shdma_slave.slave_id = port ? pdata->dma_slave_tx_b :
361                         pdata->dma_slave_tx_a;
362         } else {
363                 siu_stream = &port_info->capture;
364                 param = &siu_stream->param;
365                 param->shdma_slave.slave_id = port ? pdata->dma_slave_rx_b :
366                         pdata->dma_slave_rx_a;
367         }
368 
369         /* Get DMA channel */
370         siu_stream->chan = dma_request_channel(mask, filter, param);
371         if (!siu_stream->chan) {
372                 dev_err(dev, "DMA channel allocation failed!\n");
373                 return -EBUSY;
374         }
375 
376         siu_stream->substream = ss;
377 
378         return 0;
379 }
380 
381 static int siu_pcm_close(struct snd_pcm_substream *ss)
382 {
383         struct siu_info *info = siu_i2s_data;
384         struct device *dev = ss->pcm->card->dev;
385         struct siu_port *port_info = siu_port_info(ss);
386         struct siu_stream *siu_stream;
387 
388         dev_dbg(dev, "%s: port=%d\n", __func__, info->port_id);
389 
390         if (ss->stream == SNDRV_PCM_STREAM_PLAYBACK)
391                 siu_stream = &port_info->playback;
392         else
393                 siu_stream = &port_info->capture;
394 
395         dma_release_channel(siu_stream->chan);
396         siu_stream->chan = NULL;
397 
398         siu_stream->substream = NULL;
399 
400         return 0;
401 }
402 
403 static int siu_pcm_prepare(struct snd_pcm_substream *ss)
404 {
405         struct siu_info *info = siu_i2s_data;
406         struct siu_port *port_info = siu_port_info(ss);
407         struct device *dev = ss->pcm->card->dev;
408         struct snd_pcm_runtime  *rt = ss->runtime;
409         struct siu_stream *siu_stream;
410         snd_pcm_sframes_t xfer_cnt;
411 
412         if (ss->stream == SNDRV_PCM_STREAM_PLAYBACK)
413                 siu_stream = &port_info->playback;
414         else
415                 siu_stream = &port_info->capture;
416 
417         rt = siu_stream->substream->runtime;
418 
419         siu_stream->buf_bytes = snd_pcm_lib_buffer_bytes(ss);
420         siu_stream->period_bytes = snd_pcm_lib_period_bytes(ss);
421 
422         dev_dbg(dev, "%s: port=%d, %d channels, period=%u bytes\n", __func__,
423                 info->port_id, rt->channels, siu_stream->period_bytes);
424 
425         /* We only support buffers that are multiples of the period */
426         if (siu_stream->buf_bytes % siu_stream->period_bytes) {
427                 dev_err(dev, "%s() - buffer=%d not multiple of period=%d\n",
428                        __func__, siu_stream->buf_bytes,
429                        siu_stream->period_bytes);
430                 return -EINVAL;
431         }
432 
433         xfer_cnt = bytes_to_frames(rt, siu_stream->period_bytes);
434         if (!xfer_cnt || xfer_cnt > 0x1000000)
435                 return -EINVAL;
436 
437         siu_stream->format = rt->format;
438         siu_stream->xfer_cnt = xfer_cnt;
439 
440         dev_dbg(dev, "port=%d buf=%lx buf_bytes=%d period_bytes=%d "
441                 "format=%d channels=%d xfer_cnt=%d\n", info->port_id,
442                 (unsigned long)rt->dma_addr, siu_stream->buf_bytes,
443                 siu_stream->period_bytes,
444                 siu_stream->format, rt->channels, (int)xfer_cnt);
445 
446         return 0;
447 }
448 
449 static int siu_pcm_trigger(struct snd_pcm_substream *ss, int cmd)
450 {
451         struct siu_info *info = siu_i2s_data;
452         struct device *dev = ss->pcm->card->dev;
453         struct siu_port *port_info = siu_port_info(ss);
454         int ret;
455 
456         dev_dbg(dev, "%s: port=%d@%p, cmd=%d\n", __func__,
457                 info->port_id, port_info, cmd);
458 
459         switch (cmd) {
460         case SNDRV_PCM_TRIGGER_START:
461                 if (ss->stream == SNDRV_PCM_STREAM_PLAYBACK)
462                         ret = siu_pcm_stmwrite_start(port_info);
463                 else
464                         ret = siu_pcm_stmread_start(port_info);
465 
466                 if (ret < 0)
467                         dev_warn(dev, "%s: start failed on port=%d\n",
468                                  __func__, info->port_id);
469 
470                 break;
471         case SNDRV_PCM_TRIGGER_STOP:
472                 if (ss->stream == SNDRV_PCM_STREAM_PLAYBACK)
473                         siu_pcm_stmwrite_stop(port_info);
474                 else
475                         siu_pcm_stmread_stop(port_info);
476                 ret = 0;
477 
478                 break;
479         default:
480                 dev_err(dev, "%s() unsupported cmd=%d\n", __func__, cmd);
481                 ret = -EINVAL;
482         }
483 
484         return ret;
485 }
486 
487 /*
488  * So far only resolution of one period is supported, subject to extending the
489  * dmangine API
490  */
491 static snd_pcm_uframes_t siu_pcm_pointer_dma(struct snd_pcm_substream *ss)
492 {
493         struct device *dev = ss->pcm->card->dev;
494         struct siu_info *info = siu_i2s_data;
495         u32 __iomem *base = info->reg;
496         struct siu_port *port_info = siu_port_info(ss);
497         struct snd_pcm_runtime *rt = ss->runtime;
498         size_t ptr;
499         struct siu_stream *siu_stream;
500 
501         if (ss->stream == SNDRV_PCM_STREAM_PLAYBACK)
502                 siu_stream = &port_info->playback;
503         else
504                 siu_stream = &port_info->capture;
505 
506         /*
507          * ptr is the offset into the buffer where the dma is currently at. We
508          * check if the dma buffer has just wrapped.
509          */
510         ptr = PERIOD_OFFSET(rt->dma_addr,
511                             siu_stream->cur_period,
512                             siu_stream->period_bytes) - rt->dma_addr;
513 
514         dev_dbg(dev,
515                 "%s: port=%d, events %x, FSTS %x, xferred %u/%u, cookie %d\n",
516                 __func__, info->port_id, siu_read32(base + SIU_EVNTC),
517                 siu_read32(base + SIU_SBFSTS), ptr, siu_stream->buf_bytes,
518                 siu_stream->cookie);
519 
520         if (ptr >= siu_stream->buf_bytes)
521                 ptr = 0;
522 
523         return bytes_to_frames(ss->runtime, ptr);
524 }
525 
526 static int siu_pcm_new(struct snd_soc_pcm_runtime *rtd)
527 {
528         /* card->dev == socdev->dev, see snd_soc_new_pcms() */
529         struct snd_card *card = rtd->card->snd_card;
530         struct snd_pcm *pcm = rtd->pcm;
531         struct siu_info *info = siu_i2s_data;
532         struct platform_device *pdev = to_platform_device(card->dev);
533         int ret;
534         int i;
535 
536         /* pdev->id selects between SIUA and SIUB */
537         if (pdev->id < 0 || pdev->id >= SIU_PORT_NUM)
538                 return -EINVAL;
539 
540         info->port_id = pdev->id;
541 
542         /*
543          * While the siu has 2 ports, only one port can be on at a time (only 1
544          * SPB). So far all the boards using the siu had only one of the ports
545          * wired to a codec. To simplify things, we only register one port with
546          * alsa. In case both ports are needed, it should be changed here
547          */
548         for (i = pdev->id; i < pdev->id + 1; i++) {
549                 struct siu_port **port_info = &siu_ports[i];
550 
551                 ret = siu_init_port(i, port_info, card);
552                 if (ret < 0)
553                         return ret;
554 
555                 ret = snd_pcm_lib_preallocate_pages_for_all(pcm,
556                                 SNDRV_DMA_TYPE_DEV, NULL,
557                                 SIU_BUFFER_BYTES_MAX, SIU_BUFFER_BYTES_MAX);
558                 if (ret < 0) {
559                         dev_err(card->dev,
560                                "snd_pcm_lib_preallocate_pages_for_all() err=%d",
561                                 ret);
562                         goto fail;
563                 }
564 
565                 (*port_info)->pcm = pcm;
566 
567                 /* IO tasklets */
568                 tasklet_init(&(*port_info)->playback.tasklet, siu_io_tasklet,
569                              (unsigned long)&(*port_info)->playback);
570                 tasklet_init(&(*port_info)->capture.tasklet, siu_io_tasklet,
571                              (unsigned long)&(*port_info)->capture);
572         }
573 
574         dev_info(card->dev, "SuperH SIU driver initialized.\n");
575         return 0;
576 
577 fail:
578         siu_free_port(siu_ports[pdev->id]);
579         dev_err(card->dev, "SIU: failed to initialize.\n");
580         return ret;
581 }
582 
583 static void siu_pcm_free(struct snd_pcm *pcm)
584 {
585         struct platform_device *pdev = to_platform_device(pcm->card->dev);
586         struct siu_port *port_info = siu_ports[pdev->id];
587 
588         tasklet_kill(&port_info->capture.tasklet);
589         tasklet_kill(&port_info->playback.tasklet);
590 
591         siu_free_port(port_info);
592         snd_pcm_lib_preallocate_free_for_all(pcm);
593 
594         dev_dbg(pcm->card->dev, "%s\n", __func__);
595 }
596 
597 static struct snd_pcm_ops siu_pcm_ops = {
598         .open           = siu_pcm_open,
599         .close          = siu_pcm_close,
600         .ioctl          = snd_pcm_lib_ioctl,
601         .hw_params      = siu_pcm_hw_params,
602         .hw_free        = siu_pcm_hw_free,
603         .prepare        = siu_pcm_prepare,
604         .trigger        = siu_pcm_trigger,
605         .pointer        = siu_pcm_pointer_dma,
606 };
607 
608 struct snd_soc_platform_driver siu_platform = {
609         .ops                    = &siu_pcm_ops,
610         .pcm_new        = siu_pcm_new,
611         .pcm_free       = siu_pcm_free,
612 };
613 EXPORT_SYMBOL_GPL(siu_platform);
614 

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