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