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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                         return ret;
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                         return ret;
281         }
282 
283         return 0;
284 }
285 
286 static int ssi_irq = 0;
287 
288 static int imx_pcm_fiq_new(struct snd_soc_pcm_runtime *rtd)
289 {
290         struct snd_pcm *pcm = rtd->pcm;
291         struct snd_pcm_substream *substream;
292         int ret;
293 
294         ret = imx_pcm_new(rtd);
295         if (ret)
296                 return ret;
297 
298         substream = pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream;
299         if (substream) {
300                 struct snd_dma_buffer *buf = &substream->dma_buffer;
301 
302                 imx_ssi_fiq_tx_buffer = (unsigned long)buf->area;
303         }
304 
305         substream = pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream;
306         if (substream) {
307                 struct snd_dma_buffer *buf = &substream->dma_buffer;
308 
309                 imx_ssi_fiq_rx_buffer = (unsigned long)buf->area;
310         }
311 
312         set_fiq_handler(&imx_ssi_fiq_start,
313                 &imx_ssi_fiq_end - &imx_ssi_fiq_start);
314 
315         return 0;
316 }
317 
318 static void imx_pcm_free(struct snd_pcm *pcm)
319 {
320         struct snd_pcm_substream *substream;
321         struct snd_dma_buffer *buf;
322         int stream;
323 
324         for (stream = 0; stream < 2; stream++) {
325                 substream = pcm->streams[stream].substream;
326                 if (!substream)
327                         continue;
328 
329                 buf = &substream->dma_buffer;
330                 if (!buf->area)
331                         continue;
332 
333                 dma_free_writecombine(pcm->card->dev, buf->bytes,
334                                       buf->area, buf->addr);
335                 buf->area = NULL;
336         }
337 }
338 
339 static void imx_pcm_fiq_free(struct snd_pcm *pcm)
340 {
341         mxc_set_irq_fiq(ssi_irq, 0);
342         release_fiq(&fh);
343         imx_pcm_free(pcm);
344 }
345 
346 static struct snd_soc_platform_driver imx_soc_platform_fiq = {
347         .ops            = &imx_pcm_ops,
348         .pcm_new        = imx_pcm_fiq_new,
349         .pcm_free       = imx_pcm_fiq_free,
350 };
351 
352 int imx_pcm_fiq_init(struct platform_device *pdev,
353                 struct imx_pcm_fiq_params *params)
354 {
355         int ret;
356 
357         ret = claim_fiq(&fh);
358         if (ret) {
359                 dev_err(&pdev->dev, "failed to claim fiq: %d", ret);
360                 return ret;
361         }
362 
363         mxc_set_irq_fiq(params->irq, 1);
364         ssi_irq = params->irq;
365 
366         imx_pcm_fiq = params->irq;
367 
368         imx_ssi_fiq_base = (unsigned long)params->base;
369 
370         params->dma_params_tx->maxburst = 4;
371         params->dma_params_rx->maxburst = 6;
372 
373         ret = snd_soc_register_platform(&pdev->dev, &imx_soc_platform_fiq);
374         if (ret)
375                 goto failed_register;
376 
377         return 0;
378 
379 failed_register:
380         mxc_set_irq_fiq(ssi_irq, 0);
381         release_fiq(&fh);
382 
383         return ret;
384 }
385 EXPORT_SYMBOL_GPL(imx_pcm_fiq_init);
386 
387 void imx_pcm_fiq_exit(struct platform_device *pdev)
388 {
389         snd_soc_unregister_platform(&pdev->dev);
390 }
391 EXPORT_SYMBOL_GPL(imx_pcm_fiq_exit);
392 
393 MODULE_LICENSE("GPL");
394 

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