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 running;
  46 };
  47
  48 static enum hrtimer_restart snd_hrtimer_callback(struct hrtimer *hrt)
  49 {
  50         struct imx_pcm_runtime_data *iprtd =
  51                 container_of(hrt, struct imx_pcm_runtime_data, hrt);
  52         struct snd_pcm_substream *substream = iprtd->substream;
  53         struct pt_regs regs;
  54
  55         if (!atomic_read(&iprtd->running))
  56                 return HRTIMER_NORESTART;
  57
  58         get_fiq_regs(&regs);
  59
  60         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
  61                 iprtd->offset = regs.ARM_r8 & 0xffff;
  62         else
  63                 iprtd->offset = regs.ARM_r9 & 0xffff;
  64
  65         snd_pcm_period_elapsed(substream);
  66
  67         hrtimer_forward_now(hrt, ns_to_ktime(iprtd->poll_time_ns));
  68
  69         return HRTIMER_RESTART;
  70 }
  71
  72 static struct fiq_handler fh = {
  73         .name           = DRV_NAME,
  74 };
  75
  76 static int snd_imx_pcm_hw_params(struct snd_pcm_substream *substream,
  77                                 struct snd_pcm_hw_params *params)
  78 {
  79         struct snd_pcm_runtime *runtime = substream->runtime;
  80         struct imx_pcm_runtime_data *iprtd = runtime->private_data;
  81
  82         iprtd->periods = params_periods(params);
  83         iprtd->period = params_period_bytes(params);
  84         iprtd->offset = 0;
  85         iprtd->poll_time_ns = 1000000000 / params_rate(params) *
  86                                 params_period_size(params);
  87         snd_pcm_set_runtime_buffer(substream, &substream->dma_buffer);
  88
  89         return 0;
  90 }
  91
  92 static int snd_imx_pcm_prepare(struct snd_pcm_substream *substream)
  93 {
  94         struct snd_pcm_runtime *runtime = substream->runtime;
  95         struct imx_pcm_runtime_data *iprtd = runtime->private_data;
  96         struct pt_regs regs;
  97
  98         get_fiq_regs(&regs);
  99         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
 100                 regs.ARM_r8 = (iprtd->period * iprtd->periods - 1) << 16;
 101         else
 102                 regs.ARM_r9 = (iprtd->period * iprtd->periods - 1) << 16;
 103
 104         set_fiq_regs(&regs);
 105
 106         return 0;
 107 }
 108
 109 static int fiq_enable;
 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                 atomic_set(&iprtd->running, 1);
 122                 hrtimer_start(&iprtd->hrt, ns_to_ktime(iprtd->poll_time_ns),
 123                       HRTIMER_MODE_REL);
 124                 if (++fiq_enable == 1)
 125                         enable_fiq(imx_pcm_fiq);
 126
 127                 break;
 128
 129         case SNDRV_PCM_TRIGGER_STOP:
 130         case SNDRV_PCM_TRIGGER_SUSPEND:
 131         case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
 132                 atomic_set(&iprtd->running, 0);
 133
 134                 if (--fiq_enable == 0)
 135                         disable_fiq(imx_pcm_fiq);
 136
 137                 break;
 138         default:
 139                 return -EINVAL;
 140         }
 141
 142         return 0;
 143 }
 144
 145 static snd_pcm_uframes_t snd_imx_pcm_pointer(struct snd_pcm_substream *substream)
 146 {
 147         struct snd_pcm_runtime *runtime = substream->runtime;
 148         struct imx_pcm_runtime_data *iprtd = runtime->private_data;
 149
 150         return bytes_to_frames(substream->runtime, iprtd->offset);
 151 }
 152
 153 static struct snd_pcm_hardware snd_imx_hardware = {
 154         .info = SNDRV_PCM_INFO_INTERLEAVED |
 155                 SNDRV_PCM_INFO_BLOCK_TRANSFER |
 156                 SNDRV_PCM_INFO_MMAP |
 157                 SNDRV_PCM_INFO_MMAP_VALID |
 158                 SNDRV_PCM_INFO_PAUSE |
 159                 SNDRV_PCM_INFO_RESUME,
 160         .formats = SNDRV_PCM_FMTBIT_S16_LE,
 161         .rate_min = 8000,
 162         .channels_min = 2,
 163         .channels_max = 2,
 164         .buffer_bytes_max = IMX_SSI_DMABUF_SIZE,
 165         .period_bytes_min = 128,
 166         .period_bytes_max = 16 * 1024,
 167         .periods_min = 4,
 168         .periods_max = 255,
 169         .fifo_size = 0,
 170 };
 171
 172 static int snd_imx_open(struct snd_pcm_substream *substream)
 173 {
 174         struct snd_pcm_runtime *runtime = substream->runtime;
 175         struct imx_pcm_runtime_data *iprtd;
 176         int ret;
 177
 178         iprtd = kzalloc(sizeof(*iprtd), GFP_KERNEL);
 179         if (iprtd == NULL)
 180                 return -ENOMEM;
 181         runtime->private_data = iprtd;
 182
 183         iprtd->substream = substream;
 184
 185         atomic_set(&iprtd->running, 0);
 186         hrtimer_init(&iprtd->hrt, CLOCK_MONOTONIC, HRTIMER_MODE_REL);
 187         iprtd->hrt.function = snd_hrtimer_callback;
 188
 189         ret = snd_pcm_hw_constraint_integer(substream->runtime,
 190                         SNDRV_PCM_HW_PARAM_PERIODS);
 191         if (ret < 0) {
 192                 kfree(iprtd);
 193                 return ret;
 194         }
 195
 196         snd_soc_set_runtime_hwparams(substream, &snd_imx_hardware);
 197         return 0;
 198 }
 199
 200 static int snd_imx_close(struct snd_pcm_substream *substream)
 201 {
 202         struct snd_pcm_runtime *runtime = substream->runtime;
 203         struct imx_pcm_runtime_data *iprtd = runtime->private_data;
 204
 205         hrtimer_cancel(&iprtd->hrt);
 206
 207         kfree(iprtd);
 208
 209         return 0;
 210 }
 211
 212 static int snd_imx_pcm_mmap(struct snd_pcm_substream *substream,
 213                 struct vm_area_struct *vma)
 214 {
 215         struct snd_pcm_runtime *runtime = substream->runtime;
 216         int ret;
 217
 218         ret = dma_mmap_writecombine(substream->pcm->card->dev, vma,
 219                 runtime->dma_area, runtime->dma_addr, runtime->dma_bytes);
 220
 221         pr_debug("%s: ret: %d %p 0x%08x 0x%08x\n", __func__, ret,
 222                         runtime->dma_area,
 223                         runtime->dma_addr,
 224                         runtime->dma_bytes);
 225         return ret;
 226 }
 227
 228 static struct snd_pcm_ops imx_pcm_ops = {
 229         .open           = snd_imx_open,
 230         .close          = snd_imx_close,
 231         .ioctl          = snd_pcm_lib_ioctl,
 232         .hw_params      = snd_imx_pcm_hw_params,
 233         .prepare        = snd_imx_pcm_prepare,
 234         .trigger        = snd_imx_pcm_trigger,
 235         .pointer        = snd_imx_pcm_pointer,
 236         .mmap           = snd_imx_pcm_mmap,
 237 };
 238
 239 static int imx_pcm_preallocate_dma_buffer(struct snd_pcm *pcm, int stream)
 240 {
 241         struct snd_pcm_substream *substream = pcm->streams[stream].substream;
 242         struct snd_dma_buffer *buf = &substream->dma_buffer;
 243         size_t size = IMX_SSI_DMABUF_SIZE;
 244
 245         buf->dev.type = SNDRV_DMA_TYPE_DEV;
 246         buf->dev.dev = pcm->card->dev;
 247         buf->private_data = NULL;
 248         buf->area = dma_alloc_writecombine(pcm->card->dev, size,
 249                                            &buf->addr, GFP_KERNEL);
 250         if (!buf->area)
 251                 return -ENOMEM;
 252         buf->bytes = size;
 253
 254         return 0;
 255 }
 256
 257 static u64 imx_pcm_dmamask = DMA_BIT_MASK(32);
 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 = 0;
 264
 265         if (!card->dev->dma_mask)
 266                 card->dev->dma_mask = &imx_pcm_dmamask;
 267         if (!card->dev->coherent_dma_mask)
 268                 card->dev->coherent_dma_mask = DMA_BIT_MASK(32);
 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");