Version:  2.6.34 2.6.35 2.6.36 2.6.37 2.6.38 2.6.39 3.0 3.1 3.2 3.3 3.4 3.5 3.6 3.7 3.8 3.9 3.10 3.11 3.12 3.13 3.14

Linux/sound/soc/fsl/imx-pcm-fiq.c

  1 /*
  2  * imx-pcm-fiq.c  --  ALSA Soc Audio Layer
  3  *
  4  * Copyright 2009 Sascha Hauer <s.hauer@pengutronix.de>
  5  *
  6  * This code is based on code copyrighted by Freescale,
  7  * Liam Girdwood, Javier Martin and probably others.
  8  *
  9  *  This program is free software; you can redistribute  it and/or modify it
 10  *  under  the terms of  the GNU General  Public License as published by the
 11  *  Free Software Foundation;  either version 2 of the  License, or (at your
 12  *  option) any later version.
 13  */
 14 #include <linux/clk.h>
 15 #include <linux/delay.h>
 16 #include <linux/device.h>
 17 #include <linux/dma-mapping.h>
 18 #include <linux/init.h>
 19 #include <linux/interrupt.h>
 20 #include <linux/module.h>
 21 #include <linux/platform_device.h>
 22 #include <linux/slab.h>
 23 
 24 #include <sound/core.h>
 25 #include <sound/dmaengine_pcm.h>
 26 #include <sound/initval.h>
 27 #include <sound/pcm.h>
 28 #include <sound/pcm_params.h>
 29 #include <sound/soc.h>
 30 
 31 #include <asm/fiq.h>
 32 
 33 #include <linux/platform_data/asoc-imx-ssi.h>
 34 
 35 #include "imx-ssi.h"
 36 #include "imx-pcm.h"
 37 
 38 struct imx_pcm_runtime_data {
 39         unsigned int period;
 40         int periods;
 41         unsigned long offset;
 42         struct hrtimer hrt;
 43         int poll_time_ns;
 44         struct snd_pcm_substream *substream;
 45         atomic_t playing;
 46         atomic_t capturing;
 47 };
 48 
 49 static enum hrtimer_restart snd_hrtimer_callback(struct hrtimer *hrt)
 50 {
 51         struct imx_pcm_runtime_data *iprtd =
 52                 container_of(hrt, struct imx_pcm_runtime_data, hrt);
 53         struct snd_pcm_substream *substream = iprtd->substream;
 54         struct pt_regs regs;
 55 
 56         if (!atomic_read(&iprtd->playing) && !atomic_read(&iprtd->capturing))
 57                 return HRTIMER_NORESTART;
 58 
 59         get_fiq_regs(&regs);
 60 
 61         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
 62                 iprtd->offset = regs.ARM_r8 & 0xffff;
 63         else
 64                 iprtd->offset = regs.ARM_r9 & 0xffff;
 65 
 66         snd_pcm_period_elapsed(substream);
 67 
 68         hrtimer_forward_now(hrt, ns_to_ktime(iprtd->poll_time_ns));
 69 
 70         return HRTIMER_RESTART;
 71 }
 72 
 73 static struct fiq_handler fh = {
 74         .name           = DRV_NAME,
 75 };
 76 
 77 static int snd_imx_pcm_hw_params(struct snd_pcm_substream *substream,
 78                                 struct snd_pcm_hw_params *params)
 79 {
 80         struct snd_pcm_runtime *runtime = substream->runtime;
 81         struct imx_pcm_runtime_data *iprtd = runtime->private_data;
 82 
 83         iprtd->periods = params_periods(params);
 84         iprtd->period = params_period_bytes(params);
 85         iprtd->offset = 0;
 86         iprtd->poll_time_ns = 1000000000 / params_rate(params) *
 87                                 params_period_size(params);
 88         snd_pcm_set_runtime_buffer(substream, &substream->dma_buffer);
 89 
 90         return 0;
 91 }
 92 
 93 static int snd_imx_pcm_prepare(struct snd_pcm_substream *substream)
 94 {
 95         struct snd_pcm_runtime *runtime = substream->runtime;
 96         struct imx_pcm_runtime_data *iprtd = runtime->private_data;
 97         struct pt_regs regs;
 98 
 99         get_fiq_regs(&regs);
100         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
101                 regs.ARM_r8 = (iprtd->period * iprtd->periods - 1) << 16;
102         else
103                 regs.ARM_r9 = (iprtd->period * iprtd->periods - 1) << 16;
104 
105         set_fiq_regs(&regs);
106 
107         return 0;
108 }
109 
110 static int imx_pcm_fiq;
111 
112 static int snd_imx_pcm_trigger(struct snd_pcm_substream *substream, int cmd)
113 {
114         struct snd_pcm_runtime *runtime = substream->runtime;
115         struct imx_pcm_runtime_data *iprtd = runtime->private_data;
116 
117         switch (cmd) {
118         case SNDRV_PCM_TRIGGER_START:
119         case SNDRV_PCM_TRIGGER_RESUME:
120         case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
121                 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
122                         atomic_set(&iprtd->playing, 1);
123                 else
124                         atomic_set(&iprtd->capturing, 1);
125                 hrtimer_start(&iprtd->hrt, ns_to_ktime(iprtd->poll_time_ns),
126                       HRTIMER_MODE_REL);
127                 enable_fiq(imx_pcm_fiq);
128                 break;
129 
130         case SNDRV_PCM_TRIGGER_STOP:
131         case SNDRV_PCM_TRIGGER_SUSPEND:
132         case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
133                 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
134                         atomic_set(&iprtd->playing, 0);
135                 else
136                         atomic_set(&iprtd->capturing, 0);
137                 if (!atomic_read(&iprtd->playing) &&
138                                 !atomic_read(&iprtd->capturing))
139                         disable_fiq(imx_pcm_fiq);
140                 break;
141 
142         default:
143                 return -EINVAL;
144         }
145 
146         return 0;
147 }
148 
149 static snd_pcm_uframes_t snd_imx_pcm_pointer(struct snd_pcm_substream *substream)
150 {
151         struct snd_pcm_runtime *runtime = substream->runtime;
152         struct imx_pcm_runtime_data *iprtd = runtime->private_data;
153 
154         return bytes_to_frames(substream->runtime, iprtd->offset);
155 }
156 
157 static struct snd_pcm_hardware snd_imx_hardware = {
158         .info = SNDRV_PCM_INFO_INTERLEAVED |
159                 SNDRV_PCM_INFO_BLOCK_TRANSFER |
160                 SNDRV_PCM_INFO_MMAP |
161                 SNDRV_PCM_INFO_MMAP_VALID |
162                 SNDRV_PCM_INFO_PAUSE |
163                 SNDRV_PCM_INFO_RESUME,
164         .formats = SNDRV_PCM_FMTBIT_S16_LE,
165         .buffer_bytes_max = IMX_SSI_DMABUF_SIZE,
166         .period_bytes_min = 128,
167         .period_bytes_max = 16 * 1024,
168         .periods_min = 4,
169         .periods_max = 255,
170         .fifo_size = 0,
171 };
172 
173 static int snd_imx_open(struct snd_pcm_substream *substream)
174 {
175         struct snd_pcm_runtime *runtime = substream->runtime;
176         struct imx_pcm_runtime_data *iprtd;
177         int ret;
178 
179         iprtd = kzalloc(sizeof(*iprtd), GFP_KERNEL);
180         if (iprtd == NULL)
181                 return -ENOMEM;
182         runtime->private_data = iprtd;
183 
184         iprtd->substream = substream;
185 
186         atomic_set(&iprtd->playing, 0);
187         atomic_set(&iprtd->capturing, 0);
188         hrtimer_init(&iprtd->hrt, CLOCK_MONOTONIC, HRTIMER_MODE_REL);
189         iprtd->hrt.function = snd_hrtimer_callback;
190 
191         ret = snd_pcm_hw_constraint_integer(substream->runtime,
192                         SNDRV_PCM_HW_PARAM_PERIODS);
193         if (ret < 0) {
194                 kfree(iprtd);
195                 return ret;
196         }
197 
198         snd_soc_set_runtime_hwparams(substream, &snd_imx_hardware);
199         return 0;
200 }
201 
202 static int snd_imx_close(struct snd_pcm_substream *substream)
203 {
204         struct snd_pcm_runtime *runtime = substream->runtime;
205         struct imx_pcm_runtime_data *iprtd = runtime->private_data;
206 
207         hrtimer_cancel(&iprtd->hrt);
208 
209         kfree(iprtd);
210 
211         return 0;
212 }
213 
214 static int snd_imx_pcm_mmap(struct snd_pcm_substream *substream,
215                 struct vm_area_struct *vma)
216 {
217         struct snd_pcm_runtime *runtime = substream->runtime;
218         int ret;
219 
220         ret = dma_mmap_writecombine(substream->pcm->card->dev, vma,
221                 runtime->dma_area, runtime->dma_addr, runtime->dma_bytes);
222 
223         pr_debug("%s: ret: %d %p 0x%08x 0x%08x\n", __func__, ret,
224                         runtime->dma_area,
225                         runtime->dma_addr,
226                         runtime->dma_bytes);
227         return ret;
228 }
229 
230 static struct snd_pcm_ops imx_pcm_ops = {
231         .open           = snd_imx_open,
232         .close          = snd_imx_close,
233         .ioctl          = snd_pcm_lib_ioctl,
234         .hw_params      = snd_imx_pcm_hw_params,
235         .prepare        = snd_imx_pcm_prepare,
236         .trigger        = snd_imx_pcm_trigger,
237         .pointer        = snd_imx_pcm_pointer,
238         .mmap           = snd_imx_pcm_mmap,
239 };
240 
241 static int imx_pcm_preallocate_dma_buffer(struct snd_pcm *pcm, int stream)
242 {
243         struct snd_pcm_substream *substream = pcm->streams[stream].substream;
244         struct snd_dma_buffer *buf = &substream->dma_buffer;
245         size_t size = IMX_SSI_DMABUF_SIZE;
246 
247         buf->dev.type = SNDRV_DMA_TYPE_DEV;
248         buf->dev.dev = pcm->card->dev;
249         buf->private_data = NULL;
250         buf->area = dma_alloc_writecombine(pcm->card->dev, size,
251                                            &buf->addr, GFP_KERNEL);
252         if (!buf->area)
253                 return -ENOMEM;
254         buf->bytes = size;
255 
256         return 0;
257 }
258 
259 static int imx_pcm_new(struct snd_soc_pcm_runtime *rtd)
260 {
261         struct snd_card *card = rtd->card->snd_card;
262         struct snd_pcm *pcm = rtd->pcm;
263         int ret;
264 
265         ret = dma_coerce_mask_and_coherent(card->dev, DMA_BIT_MASK(32));
266         if (ret)
267                 return ret;
268 
269         if (pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream) {
270                 ret = imx_pcm_preallocate_dma_buffer(pcm,
271                         SNDRV_PCM_STREAM_PLAYBACK);
272                 if (ret)
273                         goto out;
274         }
275 
276         if (pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream) {
277                 ret = imx_pcm_preallocate_dma_buffer(pcm,
278                         SNDRV_PCM_STREAM_CAPTURE);
279                 if (ret)
280                         goto out;
281         }
282 
283 out:
284         return ret;
285 }
286 
287 static int ssi_irq = 0;
288 
289 static int imx_pcm_fiq_new(struct snd_soc_pcm_runtime *rtd)
290 {
291         struct snd_pcm *pcm = rtd->pcm;
292         struct snd_pcm_substream *substream;
293         int ret;
294 
295         ret = imx_pcm_new(rtd);
296         if (ret)
297                 return ret;
298 
299         substream = pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream;
300         if (substream) {
301                 struct snd_dma_buffer *buf = &substream->dma_buffer;
302 
303                 imx_ssi_fiq_tx_buffer = (unsigned long)buf->area;
304         }
305 
306         substream = pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream;
307         if (substream) {
308                 struct snd_dma_buffer *buf = &substream->dma_buffer;
309 
310                 imx_ssi_fiq_rx_buffer = (unsigned long)buf->area;
311         }
312 
313         set_fiq_handler(&imx_ssi_fiq_start,
314                 &imx_ssi_fiq_end - &imx_ssi_fiq_start);
315 
316         return 0;
317 }
318 
319 static void imx_pcm_free(struct snd_pcm *pcm)
320 {
321         struct snd_pcm_substream *substream;
322         struct snd_dma_buffer *buf;
323         int stream;
324 
325         for (stream = 0; stream < 2; stream++) {
326                 substream = pcm->streams[stream].substream;
327                 if (!substream)
328                         continue;
329 
330                 buf = &substream->dma_buffer;
331                 if (!buf->area)
332                         continue;
333 
334                 dma_free_writecombine(pcm->card->dev, buf->bytes,
335                                       buf->area, buf->addr);
336                 buf->area = NULL;
337         }
338 }
339 
340 static void imx_pcm_fiq_free(struct snd_pcm *pcm)
341 {
342         mxc_set_irq_fiq(ssi_irq, 0);
343         release_fiq(&fh);
344         imx_pcm_free(pcm);
345 }
346 
347 static struct snd_soc_platform_driver imx_soc_platform_fiq = {
348         .ops            = &imx_pcm_ops,
349         .pcm_new        = imx_pcm_fiq_new,
350         .pcm_free       = imx_pcm_fiq_free,
351 };
352 
353 int imx_pcm_fiq_init(struct platform_device *pdev,
354                 struct imx_pcm_fiq_params *params)
355 {
356         int ret;
357 
358         ret = claim_fiq(&fh);
359         if (ret) {
360                 dev_err(&pdev->dev, "failed to claim fiq: %d", ret);
361                 return ret;
362         }
363 
364         mxc_set_irq_fiq(params->irq, 1);
365         ssi_irq = params->irq;
366 
367         imx_pcm_fiq = params->irq;
368 
369         imx_ssi_fiq_base = (unsigned long)params->base;
370 
371         params->dma_params_tx->maxburst = 4;
372         params->dma_params_rx->maxburst = 6;
373 
374         ret = snd_soc_register_platform(&pdev->dev, &imx_soc_platform_fiq);
375         if (ret)
376                 goto failed_register;
377 
378         return 0;
379 
380 failed_register:
381         mxc_set_irq_fiq(ssi_irq, 0);
382         release_fiq(&fh);
383 
384         return ret;
385 }
386 EXPORT_SYMBOL_GPL(imx_pcm_fiq_init);
387 
388 void imx_pcm_fiq_exit(struct platform_device *pdev)
389 {
390         snd_soc_unregister_platform(&pdev->dev);
391 }
392 EXPORT_SYMBOL_GPL(imx_pcm_fiq_exit);
393 
394 MODULE_LICENSE("GPL");
395 

This page was automatically generated by LXR 0.3.1 (source).  •  Linux is a registered trademark of Linus Torvalds  •  Contact us