linux/sound/soc/fsl/imx-pcm-fiq.c
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   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
  33struct 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
  44static 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
  68static struct fiq_handler fh = {
  69        .name           = DRV_NAME,
  70};
  71
  72static 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
  89static 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
 107static int imx_pcm_fiq;
 108
 109static 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
 147static snd_pcm_uframes_t
 148snd_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
 157static 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
 173static 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
 203static 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
 216static 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
 233static 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
 250static 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
 277static int ssi_irq;
 278
 279static 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
 310static 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
 330static 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
 338static 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
 350int 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
 378failed_register:
 379        mxc_set_irq_fiq(ssi_irq, 0);
 380        release_fiq(&fh);
 381
 382        return ret;
 383}
 384EXPORT_SYMBOL_GPL(imx_pcm_fiq_init);
 385
 386void imx_pcm_fiq_exit(struct platform_device *pdev)
 387{
 388}
 389EXPORT_SYMBOL_GPL(imx_pcm_fiq_exit);
 390
 391MODULE_LICENSE("GPL");
 392