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         unsigned long last_offset;
  43         unsigned long size;
  44         struct hrtimer hrt;
  45         int poll_time_ns;
  46         struct snd_pcm_substream *substream;
  47         atomic_t playing;
  48         atomic_t capturing;
  49 };
  50
  51 static enum hrtimer_restart snd_hrtimer_callback(struct hrtimer *hrt)
  52 {
  53         struct imx_pcm_runtime_data *iprtd =
  54                 container_of(hrt, struct imx_pcm_runtime_data, hrt);
  55         struct snd_pcm_substream *substream = iprtd->substream;
  56         struct snd_pcm_runtime *runtime = substream->runtime;
  57         struct pt_regs regs;
  58         unsigned long delta;
  59
  60         if (!atomic_read(&iprtd->playing) && !atomic_read(&iprtd->capturing))
  61                 return HRTIMER_NORESTART;
  62
  63         get_fiq_regs(&regs);
  64
  65         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
  66                 iprtd->offset = regs.ARM_r8 & 0xffff;
  67         else
  68                 iprtd->offset = regs.ARM_r9 & 0xffff;
  69
  70         /* How much data have we transferred since the last period report? */
  71         if (iprtd->offset >= iprtd->last_offset)
  72                 delta = iprtd->offset - iprtd->last_offset;
  73         else
  74                 delta = runtime->buffer_size + iprtd->offset
  75                         - iprtd->last_offset;
  76
  77         /* If we've transferred at least a period then report it and
  78          * reset our poll time */
  79         if (delta >= iprtd->period) {
  80                 snd_pcm_period_elapsed(substream);
  81                 iprtd->last_offset = iprtd->offset;
  82         }
  83
  84         hrtimer_forward_now(hrt, ns_to_ktime(iprtd->poll_time_ns));
  85
  86         return HRTIMER_RESTART;
  87 }
  88
  89 static struct fiq_handler fh = {
  90         .name           = DRV_NAME,
  91 };
  92
  93 static int snd_imx_pcm_hw_params(struct snd_pcm_substream *substream,
  94                                 struct snd_pcm_hw_params *params)
  95 {
  96         struct snd_pcm_runtime *runtime = substream->runtime;
  97         struct imx_pcm_runtime_data *iprtd = runtime->private_data;
  98
  99         iprtd->size = params_buffer_bytes(params);
 100         iprtd->periods = params_periods(params);
 101         iprtd->period = params_period_bytes(params) ;
 102         iprtd->offset = 0;
 103         iprtd->last_offset = 0;
 104         iprtd->poll_time_ns = 1000000000 / params_rate(params) *
 105                                 params_period_size(params);
 106         snd_pcm_set_runtime_buffer(substream, &substream->dma_buffer);
 107
 108         return 0;
 109 }
 110
 111 static int snd_imx_pcm_prepare(struct snd_pcm_substream *substream)
 112 {
 113         struct snd_pcm_runtime *runtime = substream->runtime;
 114         struct imx_pcm_runtime_data *iprtd = runtime->private_data;
 115         struct pt_regs regs;
 116
 117         get_fiq_regs(&regs);
 118         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
 119                 regs.ARM_r8 = (iprtd->period * iprtd->periods - 1) << 16;
 120         else
 121                 regs.ARM_r9 = (iprtd->period * iprtd->periods - 1) << 16;
 122
 123         set_fiq_regs(&regs);
 124
 125         return 0;
 126 }
 127
 128 static int imx_pcm_fiq;
 129
 130 static int snd_imx_pcm_trigger(struct snd_pcm_substream *substream, int cmd)
 131 {
 132         struct snd_pcm_runtime *runtime = substream->runtime;
 133         struct imx_pcm_runtime_data *iprtd = runtime->private_data;
 134
 135         switch (cmd) {
 136         case SNDRV_PCM_TRIGGER_START:
 137         case SNDRV_PCM_TRIGGER_RESUME:
 138         case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
 139                 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
 140                         atomic_set(&iprtd->playing, 1);
 141                 else
 142                         atomic_set(&iprtd->capturing, 1);
 143                 hrtimer_start(&iprtd->hrt, ns_to_ktime(iprtd->poll_time_ns),
 144                       HRTIMER_MODE_REL);
 145                 enable_fiq(imx_pcm_fiq);
 146                 break;
 147
 148         case SNDRV_PCM_TRIGGER_STOP:
 149         case SNDRV_PCM_TRIGGER_SUSPEND:
 150         case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
 151                 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
 152                         atomic_set(&iprtd->playing, 0);
 153                 else
 154                         atomic_set(&iprtd->capturing, 0);
 155                 if (!atomic_read(&iprtd->playing) &&
 156                                 !atomic_read(&iprtd->capturing))
 157                         disable_fiq(imx_pcm_fiq);
 158                 break;
 159
 160         default:
 161                 return -EINVAL;
 162         }
 163
 164         return 0;
 165 }
 166
 167 static snd_pcm_uframes_t snd_imx_pcm_pointer(struct snd_pcm_substream *substream)
 168 {
 169         struct snd_pcm_runtime *runtime = substream->runtime;
 170         struct imx_pcm_runtime_data *iprtd = runtime->private_data;
 171
 172         return bytes_to_frames(substream->runtime, iprtd->offset);
 173 }
 174
 175 static struct snd_pcm_hardware snd_imx_hardware = {
 176         .info = SNDRV_PCM_INFO_INTERLEAVED |
 177                 SNDRV_PCM_INFO_BLOCK_TRANSFER |
 178                 SNDRV_PCM_INFO_MMAP |
 179                 SNDRV_PCM_INFO_MMAP_VALID |
 180                 SNDRV_PCM_INFO_PAUSE |
 181                 SNDRV_PCM_INFO_RESUME,
 182         .formats = SNDRV_PCM_FMTBIT_S16_LE,
 183         .rate_min = 8000,
 184         .channels_min = 2,
 185         .channels_max = 2,
 186         .buffer_bytes_max = IMX_SSI_DMABUF_SIZE,
 187         .period_bytes_min = 128,
 188         .period_bytes_max = 16 * 1024,
 189         .periods_min = 4,
 190         .periods_max = 255,
 191         .fifo_size = 0,
 192 };
 193
 194 static int snd_imx_open(struct snd_pcm_substream *substream)
 195 {
 196         struct snd_pcm_runtime *runtime = substream->runtime;
 197         struct imx_pcm_runtime_data *iprtd;
 198         int ret;
 199
 200         iprtd = kzalloc(sizeof(*iprtd), GFP_KERNEL);
 201         if (iprtd == NULL)
 202                 return -ENOMEM;
 203         runtime->private_data = iprtd;
 204
 205         iprtd->substream = substream;
 206
 207         atomic_set(&iprtd->playing, 0);
 208         atomic_set(&iprtd->capturing, 0);
 209         hrtimer_init(&iprtd->hrt, CLOCK_MONOTONIC, HRTIMER_MODE_REL);
 210         iprtd->hrt.function = snd_hrtimer_callback;
 211
 212         ret = snd_pcm_hw_constraint_integer(substream->runtime,
 213                         SNDRV_PCM_HW_PARAM_PERIODS);
 214         if (ret < 0) {
 215                 kfree(iprtd);
 216                 return ret;
 217         }
 218
 219         snd_soc_set_runtime_hwparams(substream, &snd_imx_hardware);
 220         return 0;
 221 }
 222
 223 static int snd_imx_close(struct snd_pcm_substream *substream)
 224 {
 225         struct snd_pcm_runtime *runtime = substream->runtime;
 226         struct imx_pcm_runtime_data *iprtd = runtime->private_data;
 227
 228         hrtimer_cancel(&iprtd->hrt);
 229
 230         kfree(iprtd);
 231
 232         return 0;
 233 }
 234
 235 static int snd_imx_pcm_mmap(struct snd_pcm_substream *substream,
 236                 struct vm_area_struct *vma)
 237 {
 238         struct snd_pcm_runtime *runtime = substream->runtime;
 239         int ret;
 240
 241         ret = dma_mmap_writecombine(substream->pcm->card->dev, vma,
 242                 runtime->dma_area, runtime->dma_addr, runtime->dma_bytes);
 243
 244         pr_debug("%s: ret: %d %p 0x%08x 0x%08x\n", __func__, ret,
 245                         runtime->dma_area,
 246                         runtime->dma_addr,
 247                         runtime->dma_bytes);
 248         return ret;
 249 }
 250
 251 static struct snd_pcm_ops imx_pcm_ops = {
 252         .open           = snd_imx_open,
 253         .close          = snd_imx_close,
 254         .ioctl          = snd_pcm_lib_ioctl,
 255         .hw_params      = snd_imx_pcm_hw_params,
 256         .prepare        = snd_imx_pcm_prepare,
 257         .trigger        = snd_imx_pcm_trigger,
 258         .pointer        = snd_imx_pcm_pointer,
 259         .mmap           = snd_imx_pcm_mmap,
 260 };
 261
 262 static int imx_pcm_preallocate_dma_buffer(struct snd_pcm *pcm, int stream)
 263 {
 264         struct snd_pcm_substream *substream = pcm->streams[stream].substream;
 265         struct snd_dma_buffer *buf = &substream->dma_buffer;
 266         size_t size = IMX_SSI_DMABUF_SIZE;
 267
 268         buf->dev.type = SNDRV_DMA_TYPE_DEV;
 269         buf->dev.dev = pcm->card->dev;
 270         buf->private_data = NULL;
 271         buf->area = dma_alloc_writecombine(pcm->card->dev, size,
 272                                            &buf->addr, GFP_KERNEL);
 273         if (!buf->area)
 274                 return -ENOMEM;
 275         buf->bytes = size;
 276
 277         return 0;
 278 }
 279
 280 static u64 imx_pcm_dmamask = DMA_BIT_MASK(32);
 281
 282 static int imx_pcm_new(struct snd_soc_pcm_runtime *rtd)
 283 {
 284         struct snd_card *card = rtd->card->snd_card;
 285         struct snd_pcm *pcm = rtd->pcm;
 286         int ret = 0;
 287
 288         if (!card->dev->dma_mask)
 289                 card->dev->dma_mask = &imx_pcm_dmamask;
 290         if (!card->dev->coherent_dma_mask)
 291                 card->dev->coherent_dma_mask = DMA_BIT_MASK(32);
 292         if (pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream) {
 293                 ret = imx_pcm_preallocate_dma_buffer(pcm,
 294                         SNDRV_PCM_STREAM_PLAYBACK);
 295                 if (ret)
 296                         goto out;
 297         }
 298
 299         if (pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream) {
 300                 ret = imx_pcm_preallocate_dma_buffer(pcm,
 301                         SNDRV_PCM_STREAM_CAPTURE);
 302                 if (ret)
 303                         goto out;
 304         }
 305
 306 out:
 307         return ret;
 308 }
 309
 310 static int ssi_irq = 0;
 311
 312 static int imx_pcm_fiq_new(struct snd_soc_pcm_runtime *rtd)
 313 {
 314         struct snd_pcm *pcm = rtd->pcm;
 315         struct snd_pcm_substream *substream;
 316         int ret;
 317
 318         ret = imx_pcm_new(rtd);
 319         if (ret)
 320                 return ret;
 321
 322         substream = pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream;
 323         if (substream) {
 324                 struct snd_dma_buffer *buf = &substream->dma_buffer;
 325
 326                 imx_ssi_fiq_tx_buffer = (unsigned long)buf->area;
 327         }
 328
 329         substream = pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream;
 330         if (substream) {
 331                 struct snd_dma_buffer *buf = &substream->dma_buffer;
 332
 333                 imx_ssi_fiq_rx_buffer = (unsigned long)buf->area;
 334         }
 335
 336         set_fiq_handler(&imx_ssi_fiq_start,
 337                 &imx_ssi_fiq_end - &imx_ssi_fiq_start);
 338
 339         return 0;
 340 }
 341
 342 static void imx_pcm_free(struct snd_pcm *pcm)
 343 {
 344         struct snd_pcm_substream *substream;
 345         struct snd_dma_buffer *buf;
 346         int stream;
 347
 348         for (stream = 0; stream < 2; stream++) {
 349                 substream = pcm->streams[stream].substream;
 350                 if (!substream)
 351                         continue;
 352
 353                 buf = &substream->dma_buffer;
 354                 if (!buf->area)
 355                         continue;
 356
 357                 dma_free_writecombine(pcm->card->dev, buf->bytes,
 358                                       buf->area, buf->addr);
 359                 buf->area = NULL;
 360         }
 361 }
 362
 363 static void imx_pcm_fiq_free(struct snd_pcm *pcm)
 364 {
 365         mxc_set_irq_fiq(ssi_irq, 0);
 366         release_fiq(&fh);
 367         imx_pcm_free(pcm);
 368 }
 369
 370 static struct snd_soc_platform_driver imx_soc_platform_fiq = {
 371         .ops            = &imx_pcm_ops,
 372         .pcm_new        = imx_pcm_fiq_new,
 373         .pcm_free       = imx_pcm_fiq_free,
 374 };
 375
 376 int imx_pcm_fiq_init(struct platform_device *pdev,
 377                 struct imx_pcm_fiq_params *params)
 378 {
 379         int ret;
 380
 381         ret = claim_fiq(&fh);
 382         if (ret) {
 383                 dev_err(&pdev->dev, "failed to claim fiq: %d", ret);
 384                 return ret;
 385         }
 386
 387         mxc_set_irq_fiq(params->irq, 1);
 388         ssi_irq = params->irq;
 389
 390         imx_pcm_fiq = params->irq;
 391
 392         imx_ssi_fiq_base = (unsigned long)params->base;
 393
 394         params->dma_params_tx->maxburst = 4;
 395         params->dma_params_rx->maxburst = 6;
 396
 397         ret = snd_soc_register_platform(&pdev->dev, &imx_soc_platform_fiq);
 398         if (ret)
 399                 goto failed_register;
 400
 401         return 0;
 402
 403 failed_register:
 404         mxc_set_irq_fiq(ssi_irq, 0);
 405         release_fiq(&fh);
 406
 407         return ret;
 408 }
 409 EXPORT_SYMBOL_GPL(imx_pcm_fiq_init);
 410
 411 void imx_pcm_fiq_exit(struct platform_device *pdev)
 412 {
 413         snd_soc_unregister_platform(&pdev->dev);
 414 }
 415 EXPORT_SYMBOL_GPL(imx_pcm_fiq_exit);
 416
 417 MODULE_LICENSE("GPL");