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_soc_component *component,
  73                                  struct snd_pcm_substream *substream,
  74                                  struct snd_pcm_hw_params *params)
  75 {
  76         struct snd_pcm_runtime *runtime = substream->runtime;
  77         struct imx_pcm_runtime_data *iprtd = runtime->private_data;
  78
  79         iprtd->periods = params_periods(params);
  80         iprtd->period = params_period_bytes(params);
  81         iprtd->offset = 0;
  82         iprtd->poll_time_ns = 1000000000 / params_rate(params) *
  83                                 params_period_size(params);
  84         snd_pcm_set_runtime_buffer(substream, &substream->dma_buffer);
  85
  86         return 0;
  87 }
  88
  89 static int snd_imx_pcm_prepare(struct snd_soc_component *component,
  90                                struct snd_pcm_substream *substream)
  91 {
  92         struct snd_pcm_runtime *runtime = substream->runtime;
  93         struct imx_pcm_runtime_data *iprtd = runtime->private_data;
  94         struct pt_regs regs;
  95
  96         get_fiq_regs(&regs);
  97         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
  98                 regs.ARM_r8 = (iprtd->period * iprtd->periods - 1) << 16;
  99         else
 100                 regs.ARM_r9 = (iprtd->period * iprtd->periods - 1) << 16;
 101
 102         set_fiq_regs(&regs);
 103
 104         return 0;
 105 }
 106
 107 static int imx_pcm_fiq;
 108
 109 static int snd_imx_pcm_trigger(struct snd_soc_component *component,
 110                                struct snd_pcm_substream *substream, int cmd)
 111 {
 112         struct snd_pcm_runtime *runtime = substream->runtime;
 113         struct imx_pcm_runtime_data *iprtd = runtime->private_data;
 114
 115         switch (cmd) {
 116         case SNDRV_PCM_TRIGGER_START:
 117         case SNDRV_PCM_TRIGGER_RESUME:
 118         case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
 119                 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
 120                         atomic_set(&iprtd->playing, 1);
 121                 else
 122                         atomic_set(&iprtd->capturing, 1);
 123                 hrtimer_start(&iprtd->hrt, ns_to_ktime(iprtd->poll_time_ns),
 124                       HRTIMER_MODE_REL);
 125                 enable_fiq(imx_pcm_fiq);
 126                 break;
 127
 128         case SNDRV_PCM_TRIGGER_STOP:
 129         case SNDRV_PCM_TRIGGER_SUSPEND:
 130         case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
 131                 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
 132                         atomic_set(&iprtd->playing, 0);
 133                 else
 134                         atomic_set(&iprtd->capturing, 0);
 135                 if (!atomic_read(&iprtd->playing) &&
 136                                 !atomic_read(&iprtd->capturing))
 137                         disable_fiq(imx_pcm_fiq);
 138                 break;
 139
 140         default:
 141                 return -EINVAL;
 142         }
 143
 144         return 0;
 145 }
 146
 147 static snd_pcm_uframes_t
 148 snd_imx_pcm_pointer(struct snd_soc_component *component,
 149                     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 const 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         .buffer_bytes_max = IMX_SSI_DMABUF_SIZE,
 166         .period_bytes_min = 128,
 167         .period_bytes_max = 16 * 1024,
 168         .periods_min = 4,
 169         .periods_max = 255,
 170         .fifo_size = 0,
 171 };
 172
 173 static int snd_imx_open(struct snd_soc_component *component,
 174                         struct snd_pcm_substream *substream)
 175 {
 176         struct snd_pcm_runtime *runtime = substream->runtime;
 177         struct imx_pcm_runtime_data *iprtd;
 178         int ret;
 179
 180         iprtd = kzalloc(sizeof(*iprtd), GFP_KERNEL);
 181         if (iprtd == NULL)
 182                 return -ENOMEM;
 183         runtime->private_data = iprtd;
 184
 185         iprtd->substream = substream;
 186
 187         atomic_set(&iprtd->playing, 0);
 188         atomic_set(&iprtd->capturing, 0);
 189         hrtimer_init(&iprtd->hrt, CLOCK_MONOTONIC, HRTIMER_MODE_REL);
 190         iprtd->hrt.function = snd_hrtimer_callback;
 191
 192         ret = snd_pcm_hw_constraint_integer(substream->runtime,
 193                         SNDRV_PCM_HW_PARAM_PERIODS);
 194         if (ret < 0) {
 195                 kfree(iprtd);
 196                 return ret;
 197         }
 198
 199         snd_soc_set_runtime_hwparams(substream, &snd_imx_hardware);
 200         return 0;
 201 }
 202
 203 static int snd_imx_close(struct snd_soc_component *component,
 204                          struct snd_pcm_substream *substream)
 205 {
 206         struct snd_pcm_runtime *runtime = substream->runtime;
 207         struct imx_pcm_runtime_data *iprtd = runtime->private_data;
 208
 209         hrtimer_cancel(&iprtd->hrt);
 210
 211         kfree(iprtd);
 212
 213         return 0;
 214 }
 215
 216 static int snd_imx_pcm_mmap(struct snd_soc_component *component,
 217                             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_wc(substream->pcm->card->dev, vma, runtime->dma_area,
 224                           runtime->dma_addr, runtime->dma_bytes);
 225
 226         pr_debug("%s: ret: %d %p %pad 0x%08zx\n", __func__, ret,
 227                         runtime->dma_area,
 228                         &runtime->dma_addr,
 229                         runtime->dma_bytes);
 230         return ret;
 231 }
 232
 233 static int imx_pcm_preallocate_dma_buffer(struct snd_pcm *pcm, int stream)
 234 {
 235         struct snd_pcm_substream *substream = pcm->streams[stream].substream;
 236         struct snd_dma_buffer *buf = &substream->dma_buffer;
 237         size_t size = IMX_SSI_DMABUF_SIZE;
 238
 239         buf->dev.type = SNDRV_DMA_TYPE_DEV;
 240         buf->dev.dev = pcm->card->dev;
 241         buf->private_data = NULL;
 242         buf->area = dma_alloc_wc(pcm->card->dev, size, &buf->addr, GFP_KERNEL);
 243         if (!buf->area)
 244                 return -ENOMEM;
 245         buf->bytes = size;
 246
 247         return 0;
 248 }
 249
 250 static int imx_pcm_new(struct snd_soc_pcm_runtime *rtd)
 251 {
 252         struct snd_card *card = rtd->card->snd_card;
 253         struct snd_pcm *pcm = rtd->pcm;
 254         int ret;
 255
 256         ret = dma_coerce_mask_and_coherent(card->dev, DMA_BIT_MASK(32));
 257         if (ret)
 258                 return ret;
 259
 260         if (pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream) {
 261                 ret = imx_pcm_preallocate_dma_buffer(pcm,
 262                         SNDRV_PCM_STREAM_PLAYBACK);
 263                 if (ret)
 264                         return ret;
 265         }
 266
 267         if (pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream) {
 268                 ret = imx_pcm_preallocate_dma_buffer(pcm,
 269                         SNDRV_PCM_STREAM_CAPTURE);
 270                 if (ret)
 271                         return ret;
 272         }
 273
 274         return 0;
 275 }
 276
 277 static int ssi_irq;
 278
 279 static int snd_imx_pcm_new(struct snd_soc_component *component,
 280                            struct snd_soc_pcm_runtime *rtd)
 281 {
 282         struct snd_pcm *pcm = rtd->pcm;
 283         struct snd_pcm_substream *substream;
 284         int ret;
 285
 286         ret = imx_pcm_new(rtd);
 287         if (ret)
 288                 return ret;
 289
 290         substream = pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream;
 291         if (substream) {
 292                 struct snd_dma_buffer *buf = &substream->dma_buffer;
 293
 294                 imx_ssi_fiq_tx_buffer = (unsigned long)buf->area;
 295         }
 296
 297         substream = pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream;
 298         if (substream) {
 299                 struct snd_dma_buffer *buf = &substream->dma_buffer;
 300
 301                 imx_ssi_fiq_rx_buffer = (unsigned long)buf->area;
 302         }
 303
 304         set_fiq_handler(&imx_ssi_fiq_start,
 305                 &imx_ssi_fiq_end - &imx_ssi_fiq_start);
 306
 307         return 0;
 308 }
 309
 310 static void imx_pcm_free(struct snd_pcm *pcm)
 311 {
 312         struct snd_pcm_substream *substream;
 313         struct snd_dma_buffer *buf;
 314         int stream;
 315
 316         for (stream = 0; stream < 2; stream++) {
 317                 substream = pcm->streams[stream].substream;
 318                 if (!substream)
 319                         continue;
 320
 321                 buf = &substream->dma_buffer;
 322                 if (!buf->area)
 323                         continue;
 324
 325                 dma_free_wc(pcm->card->dev, buf->bytes, buf->area, buf->addr);
 326                 buf->area = NULL;
 327         }
 328 }
 329
 330 static void snd_imx_pcm_free(struct snd_soc_component *component,
 331                              struct snd_pcm *pcm)
 332 {
 333         mxc_set_irq_fiq(ssi_irq, 0);
 334         release_fiq(&fh);
 335         imx_pcm_free(pcm);
 336 }
 337
 338 static const struct snd_soc_component_driver imx_soc_component_fiq = {
 339         .open           = snd_imx_open,
 340         .close          = snd_imx_close,
 341         .hw_params      = snd_imx_pcm_hw_params,
 342         .prepare        = snd_imx_pcm_prepare,
 343         .trigger        = snd_imx_pcm_trigger,
 344         .pointer        = snd_imx_pcm_pointer,
 345         .mmap           = snd_imx_pcm_mmap,
 346         .pcm_construct  = snd_imx_pcm_new,
 347         .pcm_destruct   = snd_imx_pcm_free,
 348 };
 349
 350 int imx_pcm_fiq_init(struct platform_device *pdev,
 351                 struct imx_pcm_fiq_params *params)
 352 {
 353         int ret;
 354
 355         ret = claim_fiq(&fh);
 356         if (ret) {
 357                 dev_err(&pdev->dev, "failed to claim fiq: %d", ret);
 358                 return ret;
 359         }
 360
 361         mxc_set_irq_fiq(params->irq, 1);
 362         ssi_irq = params->irq;
 363
 364         imx_pcm_fiq = params->irq;
 365
 366         imx_ssi_fiq_base = (unsigned long)params->base;
 367
 368         params->dma_params_tx->maxburst = 4;
 369         params->dma_params_rx->maxburst = 6;
 370
 371         ret = devm_snd_soc_register_component(&pdev->dev, &imx_soc_component_fiq,
 372                                               NULL, 0);
 373         if (ret)
 374                 goto failed_register;
 375
 376         return 0;
 377
 378 failed_register:
 379         mxc_set_irq_fiq(ssi_irq, 0);
 380         release_fiq(&fh);
 381
 382         return ret;
 383 }
 384 EXPORT_SYMBOL_GPL(imx_pcm_fiq_init);
 385
 386 void imx_pcm_fiq_exit(struct platform_device *pdev)
 387 {
 388 }
 389 EXPORT_SYMBOL_GPL(imx_pcm_fiq_exit);
 390
 391 MODULE_LICENSE("GPL");