sound/soc/fsl/imx-pcm-fiq.c

   1 // SPDX-License-Identifier: GPL-2.0+
   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 #include <linux/clk.h>
  10 #include <linux/delay.h>
  11 #include <linux/device.h>
  12 #include <linux/dma-mapping.h>
  13 #include <linux/init.h>
  14 #include <linux/interrupt.h>
  15 #include <linux/module.h>
  16 #include <linux/platform_device.h>
  17 #include <linux/slab.h>
  18
  19 #include <sound/core.h>
  20 #include <sound/dmaengine_pcm.h>
  21 #include <sound/initval.h>
  22 #include <sound/pcm.h>
  23 #include <sound/pcm_params.h>
  24 #include <sound/soc.h>
  25
  26 #include <asm/fiq.h>
  27
  28 #include <linux/platform_data/asoc-imx-ssi.h>
  29
  30 #include "imx-ssi.h"
  31 #include "imx-pcm.h"
  32
  33 struct imx_pcm_runtime_data {
  34         unsigned int period;
  35         int periods;
  36         unsigned long offset;
  37         struct hrtimer hrt;
  38         int poll_time_ns;
  39         struct snd_pcm_substream *substream;
  40         atomic_t playing;
  41         atomic_t capturing;
  42 };
  43
  44 static enum hrtimer_restart snd_hrtimer_callback(struct hrtimer *hrt)
  45 {
  46         struct imx_pcm_runtime_data *iprtd =
  47                 container_of(hrt, struct imx_pcm_runtime_data, hrt);
  48         struct snd_pcm_substream *substream = iprtd->substream;
  49         struct pt_regs regs;
  50
  51         if (!atomic_read(&iprtd->playing) && !atomic_read(&iprtd->capturing))
  52                 return HRTIMER_NORESTART;
  53
  54         get_fiq_regs(&regs);
  55
  56         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
  57                 iprtd->offset = regs.ARM_r8 & 0xffff;
  58         else
  59                 iprtd->offset = regs.ARM_r9 & 0xffff;
  60
  61         snd_pcm_period_elapsed(substream);
  62
  63         hrtimer_forward_now(hrt, ns_to_ktime(iprtd->poll_time_ns));
  64
  65         return HRTIMER_RESTART;
  66 }
  67
  68 static struct fiq_handler fh = {
  69         .name           = DRV_NAME,
  70 };
  71
  72 static int snd_imx_pcm_hw_params(struct snd_pcm_substream *substream,
  73                                 struct snd_pcm_hw_params *params)
  74 {
  75         struct snd_pcm_runtime *runtime = substream->runtime;
  76         struct imx_pcm_runtime_data *iprtd = runtime->private_data;
  77
  78         iprtd->periods = params_periods(params);
  79         iprtd->period = params_period_bytes(params);
  80         iprtd->offset = 0;
  81         iprtd->poll_time_ns = 1000000000 / params_rate(params) *
  82                                 params_period_size(params);
  83         snd_pcm_set_runtime_buffer(substream, &substream->dma_buffer);
  84
  85         return 0;
  86 }
  87
  88 static int snd_imx_pcm_prepare(struct snd_pcm_substream *substream)
  89 {
  90         struct snd_pcm_runtime *runtime = substream->runtime;
  91         struct imx_pcm_runtime_data *iprtd = runtime->private_data;
  92         struct pt_regs regs;
  93
  94         get_fiq_regs(&regs);
  95         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
  96                 regs.ARM_r8 = (iprtd->period * iprtd->periods - 1) << 16;
  97         else
  98                 regs.ARM_r9 = (iprtd->period * iprtd->periods - 1) << 16;
  99
 100         set_fiq_regs(&regs);
 101
 102         return 0;
 103 }
 104
 105 static int imx_pcm_fiq;
 106
 107 static int snd_imx_pcm_trigger(struct snd_pcm_substream *substream, int cmd)
 108 {
 109         struct snd_pcm_runtime *runtime = substream->runtime;
 110         struct imx_pcm_runtime_data *iprtd = runtime->private_data;
 111
 112         switch (cmd) {
 113         case SNDRV_PCM_TRIGGER_START:
 114         case SNDRV_PCM_TRIGGER_RESUME:
 115         case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
 116                 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
 117                         atomic_set(&iprtd->playing, 1);
 118                 else
 119                         atomic_set(&iprtd->capturing, 1);
 120                 hrtimer_start(&iprtd->hrt, ns_to_ktime(iprtd->poll_time_ns),
 121                       HRTIMER_MODE_REL);
 122                 enable_fiq(imx_pcm_fiq);
 123                 break;
 124
 125         case SNDRV_PCM_TRIGGER_STOP:
 126         case SNDRV_PCM_TRIGGER_SUSPEND:
 127         case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
 128                 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
 129                         atomic_set(&iprtd->playing, 0);
 130                 else
 131                         atomic_set(&iprtd->capturing, 0);
 132                 if (!atomic_read(&iprtd->playing) &&
 133                                 !atomic_read(&iprtd->capturing))
 134                         disable_fiq(imx_pcm_fiq);
 135                 break;
 136
 137         default:
 138                 return -EINVAL;
 139         }
 140
 141         return 0;
 142 }
 143
 144 static snd_pcm_uframes_t snd_imx_pcm_pointer(struct snd_pcm_substream *substream)
 145 {
 146         struct snd_pcm_runtime *runtime = substream->runtime;
 147         struct imx_pcm_runtime_data *iprtd = runtime->private_data;
 148
 149         return bytes_to_frames(substream->runtime, iprtd->offset);
 150 }
 151
 152 static const struct snd_pcm_hardware snd_imx_hardware = {
 153         .info = SNDRV_PCM_INFO_INTERLEAVED |
 154                 SNDRV_PCM_INFO_BLOCK_TRANSFER |
 155                 SNDRV_PCM_INFO_MMAP |
 156                 SNDRV_PCM_INFO_MMAP_VALID |
 157                 SNDRV_PCM_INFO_PAUSE |
 158                 SNDRV_PCM_INFO_RESUME,
 159         .formats = SNDRV_PCM_FMTBIT_S16_LE,
 160         .buffer_bytes_max = IMX_SSI_DMABUF_SIZE,
 161         .period_bytes_min = 128,
 162         .period_bytes_max = 16 * 1024,
 163         .periods_min = 4,
 164         .periods_max = 255,
 165         .fifo_size = 0,
 166 };
 167
 168 static int snd_imx_open(struct snd_pcm_substream *substream)
 169 {
 170         struct snd_pcm_runtime *runtime = substream->runtime;
 171         struct imx_pcm_runtime_data *iprtd;
 172         int ret;
 173
 174         iprtd = kzalloc(sizeof(*iprtd), GFP_KERNEL);
 175         if (iprtd == NULL)
 176                 return -ENOMEM;
 177         runtime->private_data = iprtd;
 178
 179         iprtd->substream = substream;
 180
 181         atomic_set(&iprtd->playing, 0);
 182         atomic_set(&iprtd->capturing, 0);
 183         hrtimer_init(&iprtd->hrt, CLOCK_MONOTONIC, HRTIMER_MODE_REL);
 184         iprtd->hrt.function = snd_hrtimer_callback;
 185
 186         ret = snd_pcm_hw_constraint_integer(substream->runtime,
 187                         SNDRV_PCM_HW_PARAM_PERIODS);
 188         if (ret < 0) {
 189                 kfree(iprtd);
 190                 return ret;
 191         }
 192
 193         snd_soc_set_runtime_hwparams(substream, &snd_imx_hardware);
 194         return 0;
 195 }
 196
 197 static int snd_imx_close(struct snd_pcm_substream *substream)
 198 {
 199         struct snd_pcm_runtime *runtime = substream->runtime;
 200         struct imx_pcm_runtime_data *iprtd = runtime->private_data;
 201
 202         hrtimer_cancel(&iprtd->hrt);
 203
 204         kfree(iprtd);
 205
 206         return 0;
 207 }
 208
 209 static int snd_imx_pcm_mmap(struct snd_pcm_substream *substream,
 210                 struct vm_area_struct *vma)
 211 {
 212         struct snd_pcm_runtime *runtime = substream->runtime;
 213         int ret;
 214
 215         ret = dma_mmap_wc(substream->pcm->card->dev, vma, runtime->dma_area,
 216                           runtime->dma_addr, runtime->dma_bytes);
 217
 218         pr_debug("%s: ret: %d %p %pad 0x%08zx\n", __func__, ret,
 219                         runtime->dma_area,
 220                         &runtime->dma_addr,
 221                         runtime->dma_bytes);
 222         return ret;
 223 }
 224
 225 static const struct snd_pcm_ops imx_pcm_ops = {
 226         .open           = snd_imx_open,
 227         .close          = snd_imx_close,
 228         .ioctl          = snd_pcm_lib_ioctl,
 229         .hw_params      = snd_imx_pcm_hw_params,
 230         .prepare        = snd_imx_pcm_prepare,
 231         .trigger        = snd_imx_pcm_trigger,
 232         .pointer        = snd_imx_pcm_pointer,
 233         .mmap           = snd_imx_pcm_mmap,
 234 };
 235
 236 static int imx_pcm_preallocate_dma_buffer(struct snd_pcm *pcm, int stream)
 237 {
 238         struct snd_pcm_substream *substream = pcm->streams[stream].substream;
 239         struct snd_dma_buffer *buf = &substream->dma_buffer;
 240         size_t size = IMX_SSI_DMABUF_SIZE;
 241
 242         buf->dev.type = SNDRV_DMA_TYPE_DEV;
 243         buf->dev.dev = pcm->card->dev;
 244         buf->private_data = NULL;
 245         buf->area = dma_alloc_wc(pcm->card->dev, size, &buf->addr, GFP_KERNEL);
 246         if (!buf->area)
 247                 return -ENOMEM;
 248         buf->bytes = size;
 249
 250         return 0;
 251 }
 252
 253 static int imx_pcm_new(struct snd_soc_pcm_runtime *rtd)
 254 {
 255         struct snd_card *card = rtd->card->snd_card;
 256         struct snd_pcm *pcm = rtd->pcm;
 257         int ret;
 258
 259         ret = dma_coerce_mask_and_coherent(card->dev, DMA_BIT_MASK(32));
 260         if (ret)
 261                 return ret;
 262
 263         if (pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream) {
 264                 ret = imx_pcm_preallocate_dma_buffer(pcm,
 265                         SNDRV_PCM_STREAM_PLAYBACK);
 266                 if (ret)
 267                         return ret;
 268         }
 269
 270         if (pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream) {
 271                 ret = imx_pcm_preallocate_dma_buffer(pcm,
 272                         SNDRV_PCM_STREAM_CAPTURE);
 273                 if (ret)
 274                         return ret;
 275         }
 276
 277         return 0;
 278 }
 279
 280 static int ssi_irq;
 281
 282 static int imx_pcm_fiq_new(struct snd_soc_pcm_runtime *rtd)
 283 {
 284         struct snd_pcm *pcm = rtd->pcm;
 285         struct snd_pcm_substream *substream;
 286         int ret;
 287
 288         ret = imx_pcm_new(rtd);
 289         if (ret)
 290                 return ret;
 291
 292         substream = pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream;
 293         if (substream) {
 294                 struct snd_dma_buffer *buf = &substream->dma_buffer;
 295
 296                 imx_ssi_fiq_tx_buffer = (unsigned long)buf->area;
 297         }
 298
 299         substream = pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream;
 300         if (substream) {
 301                 struct snd_dma_buffer *buf = &substream->dma_buffer;
 302
 303                 imx_ssi_fiq_rx_buffer = (unsigned long)buf->area;
 304         }
 305
 306         set_fiq_handler(&imx_ssi_fiq_start,
 307                 &imx_ssi_fiq_end - &imx_ssi_fiq_start);
 308
 309         return 0;
 310 }
 311
 312 static void imx_pcm_free(struct snd_pcm *pcm)
 313 {
 314         struct snd_pcm_substream *substream;
 315         struct snd_dma_buffer *buf;
 316         int stream;
 317
 318         for (stream = 0; stream < 2; stream++) {
 319                 substream = pcm->streams[stream].substream;
 320                 if (!substream)
 321                         continue;
 322
 323                 buf = &substream->dma_buffer;
 324                 if (!buf->area)
 325                         continue;
 326
 327                 dma_free_wc(pcm->card->dev, buf->bytes, buf->area, buf->addr);
 328                 buf->area = NULL;
 329         }
 330 }
 331
 332 static void imx_pcm_fiq_free(struct snd_pcm *pcm)
 333 {
 334         mxc_set_irq_fiq(ssi_irq, 0);
 335         release_fiq(&fh);
 336         imx_pcm_free(pcm);
 337 }
 338
 339 static const struct snd_soc_component_driver imx_soc_component_fiq = {
 340         .ops            = &imx_pcm_ops,
 341         .pcm_new        = imx_pcm_fiq_new,
 342         .pcm_free       = imx_pcm_fiq_free,
 343 };
 344
 345 int imx_pcm_fiq_init(struct platform_device *pdev,
 346                 struct imx_pcm_fiq_params *params)
 347 {
 348         int ret;
 349
 350         ret = claim_fiq(&fh);
 351         if (ret) {
 352                 dev_err(&pdev->dev, "failed to claim fiq: %d", ret);
 353                 return ret;
 354         }
 355
 356         mxc_set_irq_fiq(params->irq, 1);
 357         ssi_irq = params->irq;
 358
 359         imx_pcm_fiq = params->irq;
 360
 361         imx_ssi_fiq_base = (unsigned long)params->base;
 362
 363         params->dma_params_tx->maxburst = 4;
 364         params->dma_params_rx->maxburst = 6;
 365
 366         ret = devm_snd_soc_register_component(&pdev->dev, &imx_soc_component_fiq,
 367                                               NULL, 0);
 368         if (ret)
 369                 goto failed_register;
 370
 371         return 0;
 372
 373 failed_register:
 374         mxc_set_irq_fiq(ssi_irq, 0);
 375         release_fiq(&fh);
 376
 377         return ret;
 378 }
 379 EXPORT_SYMBOL_GPL(imx_pcm_fiq_init);
 380
 381 void imx_pcm_fiq_exit(struct platform_device *pdev)
 382 {
 383 }
 384 EXPORT_SYMBOL_GPL(imx_pcm_fiq_exit);
 385
 386 MODULE_LICENSE("GPL");