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         .rate_min = 8000,
 166         .channels_min = 2,
 167         .channels_max = 2,
 168         .buffer_bytes_max = IMX_SSI_DMABUF_SIZE,
 169         .period_bytes_min = 128,
 170         .period_bytes_max = 16 * 1024,
 171         .periods_min = 4,
 172         .periods_max = 255,
 173         .fifo_size = 0,
 174 };
 175
 176 static int snd_imx_open(struct snd_pcm_substream *substream)
 177 {
 178         struct snd_pcm_runtime *runtime = substream->runtime;
 179         struct imx_pcm_runtime_data *iprtd;
 180         int ret;
 181
 182         iprtd = kzalloc(sizeof(*iprtd), GFP_KERNEL);
 183         if (iprtd == NULL)
 184                 return -ENOMEM;
 185         runtime->private_data = iprtd;
 186
 187         iprtd->substream = substream;
 188
 189         atomic_set(&iprtd->playing, 0);
 190         atomic_set(&iprtd->capturing, 0);
 191         hrtimer_init(&iprtd->hrt, CLOCK_MONOTONIC, HRTIMER_MODE_REL);
 192         iprtd->hrt.function = snd_hrtimer_callback;
 193
 194         ret = snd_pcm_hw_constraint_integer(substream->runtime,
 195                         SNDRV_PCM_HW_PARAM_PERIODS);
 196         if (ret < 0) {
 197                 kfree(iprtd);
 198                 return ret;
 199         }
 200
 201         snd_soc_set_runtime_hwparams(substream, &snd_imx_hardware);
 202         return 0;
 203 }
 204
 205 static int snd_imx_close(struct snd_pcm_substream *substream)
 206 {
 207         struct snd_pcm_runtime *runtime = substream->runtime;
 208         struct imx_pcm_runtime_data *iprtd = runtime->private_data;
 209
 210         hrtimer_cancel(&iprtd->hrt);
 211
 212         kfree(iprtd);
 213
 214         return 0;
 215 }
 216
 217 static int snd_imx_pcm_mmap(struct snd_pcm_substream *substream,
 218                 struct vm_area_struct *vma)
 219 {
 220         struct snd_pcm_runtime *runtime = substream->runtime;
 221         int ret;
 222
 223         ret = dma_mmap_writecombine(substream->pcm->card->dev, vma,
 224                 runtime->dma_area, runtime->dma_addr, runtime->dma_bytes);
 225
 226         pr_debug("%s: ret: %d %p 0x%08x 0x%08x\n", __func__, ret,
 227                         runtime->dma_area,
 228                         runtime->dma_addr,
 229                         runtime->dma_bytes);
 230         return ret;
 231 }
 232
 233 static struct snd_pcm_ops imx_pcm_ops = {
 234         .open           = snd_imx_open,
 235         .close          = snd_imx_close,
 236         .ioctl          = snd_pcm_lib_ioctl,
 237         .hw_params      = snd_imx_pcm_hw_params,
 238         .prepare        = snd_imx_pcm_prepare,
 239         .trigger        = snd_imx_pcm_trigger,
 240         .pointer        = snd_imx_pcm_pointer,
 241         .mmap           = snd_imx_pcm_mmap,
 242 };
 243
 244 static int imx_pcm_preallocate_dma_buffer(struct snd_pcm *pcm, int stream)
 245 {
 246         struct snd_pcm_substream *substream = pcm->streams[stream].substream;
 247         struct snd_dma_buffer *buf = &substream->dma_buffer;
 248         size_t size = IMX_SSI_DMABUF_SIZE;
 249
 250         buf->dev.type = SNDRV_DMA_TYPE_DEV;
 251         buf->dev.dev = pcm->card->dev;
 252         buf->private_data = NULL;
 253         buf->area = dma_alloc_writecombine(pcm->card->dev, size,
 254                                            &buf->addr, GFP_KERNEL);
 255         if (!buf->area)
 256                 return -ENOMEM;
 257         buf->bytes = size;
 258
 259         return 0;
 260 }
 261
 262 static int imx_pcm_new(struct snd_soc_pcm_runtime *rtd)
 263 {
 264         struct snd_card *card = rtd->card->snd_card;
 265         struct snd_pcm *pcm = rtd->pcm;
 266         int ret;
 267
 268         ret = dma_coerce_mask_and_coherent(card->dev, DMA_BIT_MASK(32));
 269         if (ret)
 270                 return ret;
 271
 272         if (pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream) {
 273                 ret = imx_pcm_preallocate_dma_buffer(pcm,
 274                         SNDRV_PCM_STREAM_PLAYBACK);
 275                 if (ret)
 276                         goto out;
 277         }
 278
 279         if (pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream) {
 280                 ret = imx_pcm_preallocate_dma_buffer(pcm,
 281                         SNDRV_PCM_STREAM_CAPTURE);
 282                 if (ret)
 283                         goto out;
 284         }
 285
 286 out:
 287         return ret;
 288 }
 289
 290 static int ssi_irq = 0;
 291
 292 static int imx_pcm_fiq_new(struct snd_soc_pcm_runtime *rtd)
 293 {
 294         struct snd_pcm *pcm = rtd->pcm;
 295         struct snd_pcm_substream *substream;
 296         int ret;
 297
 298         ret = imx_pcm_new(rtd);
 299         if (ret)
 300                 return ret;
 301
 302         substream = pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream;
 303         if (substream) {
 304                 struct snd_dma_buffer *buf = &substream->dma_buffer;
 305
 306                 imx_ssi_fiq_tx_buffer = (unsigned long)buf->area;
 307         }
 308
 309         substream = pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream;
 310         if (substream) {
 311                 struct snd_dma_buffer *buf = &substream->dma_buffer;
 312
 313                 imx_ssi_fiq_rx_buffer = (unsigned long)buf->area;
 314         }
 315
 316         set_fiq_handler(&imx_ssi_fiq_start,
 317                 &imx_ssi_fiq_end - &imx_ssi_fiq_start);
 318
 319         return 0;
 320 }
 321
 322 static void imx_pcm_free(struct snd_pcm *pcm)
 323 {
 324         struct snd_pcm_substream *substream;
 325         struct snd_dma_buffer *buf;
 326         int stream;
 327
 328         for (stream = 0; stream < 2; stream++) {
 329                 substream = pcm->streams[stream].substream;
 330                 if (!substream)
 331                         continue;
 332
 333                 buf = &substream->dma_buffer;
 334                 if (!buf->area)
 335                         continue;
 336
 337                 dma_free_writecombine(pcm->card->dev, buf->bytes,
 338                                       buf->area, buf->addr);
 339                 buf->area = NULL;
 340         }
 341 }
 342
 343 static void imx_pcm_fiq_free(struct snd_pcm *pcm)
 344 {
 345         mxc_set_irq_fiq(ssi_irq, 0);
 346         release_fiq(&fh);
 347         imx_pcm_free(pcm);
 348 }
 349
 350 static struct snd_soc_platform_driver imx_soc_platform_fiq = {
 351         .ops            = &imx_pcm_ops,
 352         .pcm_new        = imx_pcm_fiq_new,
 353         .pcm_free       = imx_pcm_fiq_free,
 354 };
 355
 356 int imx_pcm_fiq_init(struct platform_device *pdev,
 357                 struct imx_pcm_fiq_params *params)
 358 {
 359         int ret;
 360
 361         ret = claim_fiq(&fh);
 362         if (ret) {
 363                 dev_err(&pdev->dev, "failed to claim fiq: %d", ret);
 364                 return ret;
 365         }
 366
 367         mxc_set_irq_fiq(params->irq, 1);
 368         ssi_irq = params->irq;
 369
 370         imx_pcm_fiq = params->irq;
 371
 372         imx_ssi_fiq_base = (unsigned long)params->base;
 373
 374         params->dma_params_tx->maxburst = 4;
 375         params->dma_params_rx->maxburst = 6;
 376
 377         ret = snd_soc_register_platform(&pdev->dev, &imx_soc_platform_fiq);
 378         if (ret)
 379                 goto failed_register;
 380
 381         return 0;
 382
 383 failed_register:
 384         mxc_set_irq_fiq(ssi_irq, 0);
 385         release_fiq(&fh);
 386
 387         return ret;
 388 }
 389 EXPORT_SYMBOL_GPL(imx_pcm_fiq_init);
 390
 391 void imx_pcm_fiq_exit(struct platform_device *pdev)
 392 {
 393         snd_soc_unregister_platform(&pdev->dev);
 394 }
 395 EXPORT_SYMBOL_GPL(imx_pcm_fiq_exit);
 396
 397 MODULE_LICENSE("GPL");