sound/soc/kirkwood/kirkwood-dma.c

   1 /*
   2  * kirkwood-dma.c
   3  *
   4  * (c) 2010 Arnaud Patard <apatard@mandriva.com>
   5  * (c) 2010 Arnaud Patard <arnaud.patard@rtp-net.org>
   6  *
   7  *  This program is free software; you can redistribute  it and/or modify it
   8  *  under  the terms of  the GNU General  Public License as published by the
   9  *  Free Software Foundation;  either version 2 of the  License, or (at your
  10  *  option) any later version.
  11  */
  12
  13 #include <linux/init.h>
  14 #include <linux/module.h>
  15 #include <linux/device.h>
  16 #include <linux/io.h>
  17 #include <linux/slab.h>
  18 #include <linux/interrupt.h>
  19 #include <linux/dma-mapping.h>
  20 #include <linux/mbus.h>
  21 #include <sound/soc.h>
  22 #include "kirkwood.h"
  23
  24 #define KIRKWOOD_RATES \
  25         (SNDRV_PCM_RATE_8000_192000 |           \
  26          SNDRV_PCM_RATE_CONTINUOUS |            \
  27          SNDRV_PCM_RATE_KNOT)
  28
  29 #define KIRKWOOD_FORMATS \
  30         (SNDRV_PCM_FMTBIT_S16_LE | \
  31          SNDRV_PCM_FMTBIT_S24_LE | \
  32          SNDRV_PCM_FMTBIT_S32_LE | \
  33          SNDRV_PCM_FMTBIT_IEC958_SUBFRAME_LE | \
  34          SNDRV_PCM_FMTBIT_IEC958_SUBFRAME_BE)
  35
  36 struct kirkwood_dma_priv {
  37         struct snd_pcm_substream *play_stream;
  38         struct snd_pcm_substream *rec_stream;
  39         struct kirkwood_dma_data *data;
  40 };
  41
  42 static struct snd_pcm_hardware kirkwood_dma_snd_hw = {
  43         .info = (SNDRV_PCM_INFO_INTERLEAVED |
  44                  SNDRV_PCM_INFO_MMAP |
  45                  SNDRV_PCM_INFO_MMAP_VALID |
  46                  SNDRV_PCM_INFO_BLOCK_TRANSFER |
  47                  SNDRV_PCM_INFO_PAUSE),
  48         .formats                = KIRKWOOD_FORMATS,
  49         .rates                  = KIRKWOOD_RATES,
  50         .rate_min               = 8000,
  51         .rate_max               = 384000,
  52         .channels_min           = 1,
  53         .channels_max           = 8,
  54         .buffer_bytes_max       = KIRKWOOD_SND_MAX_PERIOD_BYTES * KIRKWOOD_SND_MAX_PERIODS,
  55         .period_bytes_min       = KIRKWOOD_SND_MIN_PERIOD_BYTES,
  56         .period_bytes_max       = KIRKWOOD_SND_MAX_PERIOD_BYTES,
  57         .periods_min            = KIRKWOOD_SND_MIN_PERIODS,
  58         .periods_max            = KIRKWOOD_SND_MAX_PERIODS,
  59         .fifo_size              = 0,
  60 };
  61
  62 static u64 kirkwood_dma_dmamask = DMA_BIT_MASK(32);
  63
  64 static irqreturn_t kirkwood_dma_irq(int irq, void *dev_id)
  65 {
  66         struct kirkwood_dma_priv *prdata = dev_id;
  67         struct kirkwood_dma_data *priv = prdata->data;
  68         unsigned long mask, status, cause;
  69
  70         mask = readl(priv->io + KIRKWOOD_INT_MASK);
  71         status = readl(priv->io + KIRKWOOD_INT_CAUSE) & mask;
  72
  73         cause = readl(priv->io + KIRKWOOD_ERR_CAUSE);
  74         if (unlikely(cause)) {
  75                 printk(KERN_WARNING "%s: got err interrupt 0x%lx\n",
  76                                 __func__, cause);
  77                 writel(cause, priv->io + KIRKWOOD_ERR_CAUSE);
  78         }
  79
  80         /* we've enabled only bytes interrupts ... */
  81         if (status & ~(KIRKWOOD_INT_CAUSE_PLAY_BYTES | \
  82                         KIRKWOOD_INT_CAUSE_REC_BYTES)) {
  83                 printk(KERN_WARNING "%s: unexpected interrupt %lx\n",
  84                         __func__, status);
  85                 return IRQ_NONE;
  86         }
  87
  88         /* ack int */
  89         writel(status, priv->io + KIRKWOOD_INT_CAUSE);
  90
  91         if (status & KIRKWOOD_INT_CAUSE_PLAY_BYTES)
  92                 snd_pcm_period_elapsed(prdata->play_stream);
  93
  94         if (status & KIRKWOOD_INT_CAUSE_REC_BYTES)
  95                 snd_pcm_period_elapsed(prdata->rec_stream);
  96
  97         return IRQ_HANDLED;
  98 }
  99
 100 static void
 101 kirkwood_dma_conf_mbus_windows(void __iomem *base, int win,
 102                                unsigned long dma,
 103                                const struct mbus_dram_target_info *dram)
 104 {
 105         int i;
 106
 107         /* First disable and clear windows */
 108         writel(0, base + KIRKWOOD_AUDIO_WIN_CTRL_REG(win));
 109         writel(0, base + KIRKWOOD_AUDIO_WIN_BASE_REG(win));
 110
 111         /* try to find matching cs for current dma address */
 112         for (i = 0; i < dram->num_cs; i++) {
 113                 const struct mbus_dram_window *cs = dram->cs + i;
 114                 if ((cs->base & 0xffff0000) < (dma & 0xffff0000)) {
 115                         writel(cs->base & 0xffff0000,
 116                                 base + KIRKWOOD_AUDIO_WIN_BASE_REG(win));
 117                         writel(((cs->size - 1) & 0xffff0000) |
 118                                 (cs->mbus_attr << 8) |
 119                                 (dram->mbus_dram_target_id << 4) | 1,
 120                                 base + KIRKWOOD_AUDIO_WIN_CTRL_REG(win));
 121                 }
 122         }
 123 }
 124
 125 static int kirkwood_dma_open(struct snd_pcm_substream *substream)
 126 {
 127         int err;
 128         struct snd_pcm_runtime *runtime = substream->runtime;
 129         struct snd_soc_pcm_runtime *soc_runtime = substream->private_data;
 130         struct snd_soc_platform *platform = soc_runtime->platform;
 131         struct snd_soc_dai *cpu_dai = soc_runtime->cpu_dai;
 132         struct kirkwood_dma_data *priv;
 133         struct kirkwood_dma_priv *prdata = snd_soc_platform_get_drvdata(platform);
 134         const struct mbus_dram_target_info *dram;
 135         unsigned long addr;
 136
 137         priv = snd_soc_dai_get_dma_data(cpu_dai, substream);
 138         snd_soc_set_runtime_hwparams(substream, &kirkwood_dma_snd_hw);
 139
 140         /* Ensure that all constraints linked to dma burst are fulfilled */
 141         err = snd_pcm_hw_constraint_minmax(runtime,
 142                         SNDRV_PCM_HW_PARAM_BUFFER_BYTES,
 143                         priv->burst * 2,
 144                         KIRKWOOD_AUDIO_BUF_MAX-1);
 145         if (err < 0)
 146                 return err;
 147
 148         err = snd_pcm_hw_constraint_step(runtime, 0,
 149                         SNDRV_PCM_HW_PARAM_BUFFER_BYTES,
 150                         priv->burst);
 151         if (err < 0)
 152                 return err;
 153
 154         err = snd_pcm_hw_constraint_step(substream->runtime, 0,
 155                          SNDRV_PCM_HW_PARAM_PERIOD_BYTES,
 156                          priv->burst);
 157         if (err < 0)
 158                 return err;
 159
 160         if (prdata == NULL) {
 161                 prdata = kzalloc(sizeof(struct kirkwood_dma_priv), GFP_KERNEL);
 162                 if (prdata == NULL)
 163                         return -ENOMEM;
 164
 165                 prdata->data = priv;
 166
 167                 err = request_irq(priv->irq, kirkwood_dma_irq, IRQF_SHARED,
 168                                   "kirkwood-i2s", prdata);
 169                 if (err) {
 170                         kfree(prdata);
 171                         return -EBUSY;
 172                 }
 173
 174                 snd_soc_platform_set_drvdata(platform, prdata);
 175
 176                 /*
 177                  * Enable Error interrupts. We're only ack'ing them but
 178                  * it's useful for diagnostics
 179                  */
 180                 writel((unsigned long)-1, priv->io + KIRKWOOD_ERR_MASK);
 181         }
 182
 183         dram = mv_mbus_dram_info();
 184         addr = substream->dma_buffer.addr;
 185         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
 186                 prdata->play_stream = substream;
 187                 kirkwood_dma_conf_mbus_windows(priv->io,
 188                         KIRKWOOD_PLAYBACK_WIN, addr, dram);
 189         } else {
 190                 prdata->rec_stream = substream;
 191                 kirkwood_dma_conf_mbus_windows(priv->io,
 192                         KIRKWOOD_RECORD_WIN, addr, dram);
 193         }
 194
 195         return 0;
 196 }
 197
 198 static int kirkwood_dma_close(struct snd_pcm_substream *substream)
 199 {
 200         struct snd_soc_pcm_runtime *soc_runtime = substream->private_data;
 201         struct snd_soc_dai *cpu_dai = soc_runtime->cpu_dai;
 202         struct snd_soc_platform *platform = soc_runtime->platform;
 203         struct kirkwood_dma_priv *prdata = snd_soc_platform_get_drvdata(platform);
 204         struct kirkwood_dma_data *priv;
 205
 206         priv = snd_soc_dai_get_dma_data(cpu_dai, substream);
 207
 208         if (!prdata || !priv)
 209                 return 0;
 210
 211         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
 212                 prdata->play_stream = NULL;
 213         else
 214                 prdata->rec_stream = NULL;
 215
 216         if (!prdata->play_stream && !prdata->rec_stream) {
 217                 writel(0, priv->io + KIRKWOOD_ERR_MASK);
 218                 free_irq(priv->irq, prdata);
 219                 kfree(prdata);
 220                 snd_soc_platform_set_drvdata(platform, NULL);
 221         }
 222
 223         return 0;
 224 }
 225
 226 static int kirkwood_dma_hw_params(struct snd_pcm_substream *substream,
 227                                 struct snd_pcm_hw_params *params)
 228 {
 229         struct snd_pcm_runtime *runtime = substream->runtime;
 230
 231         snd_pcm_set_runtime_buffer(substream, &substream->dma_buffer);
 232         runtime->dma_bytes = params_buffer_bytes(params);
 233
 234         return 0;
 235 }
 236
 237 static int kirkwood_dma_hw_free(struct snd_pcm_substream *substream)
 238 {
 239         snd_pcm_set_runtime_buffer(substream, NULL);
 240         return 0;
 241 }
 242
 243 static int kirkwood_dma_prepare(struct snd_pcm_substream *substream)
 244 {
 245         struct snd_pcm_runtime *runtime = substream->runtime;
 246         struct snd_soc_pcm_runtime *soc_runtime = substream->private_data;
 247         struct snd_soc_dai *cpu_dai = soc_runtime->cpu_dai;
 248         struct kirkwood_dma_data *priv;
 249         unsigned long size, count;
 250
 251         priv = snd_soc_dai_get_dma_data(cpu_dai, substream);
 252
 253         /* compute buffer size in term of "words" as requested in specs */
 254         size = frames_to_bytes(runtime, runtime->buffer_size);
 255         size = (size>>2)-1;
 256         count = snd_pcm_lib_period_bytes(substream);
 257
 258         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
 259                 writel(count, priv->io + KIRKWOOD_PLAY_BYTE_INT_COUNT);
 260                 writel(runtime->dma_addr, priv->io + KIRKWOOD_PLAY_BUF_ADDR);
 261                 writel(size, priv->io + KIRKWOOD_PLAY_BUF_SIZE);
 262         } else {
 263                 writel(count, priv->io + KIRKWOOD_REC_BYTE_INT_COUNT);
 264                 writel(runtime->dma_addr, priv->io + KIRKWOOD_REC_BUF_ADDR);
 265                 writel(size, priv->io + KIRKWOOD_REC_BUF_SIZE);
 266         }
 267
 268
 269         return 0;
 270 }
 271
 272 static snd_pcm_uframes_t kirkwood_dma_pointer(struct snd_pcm_substream
 273                                                 *substream)
 274 {
 275         struct snd_soc_pcm_runtime *soc_runtime = substream->private_data;
 276         struct snd_soc_dai *cpu_dai = soc_runtime->cpu_dai;
 277         struct kirkwood_dma_data *priv;
 278         snd_pcm_uframes_t count;
 279
 280         priv = snd_soc_dai_get_dma_data(cpu_dai, substream);
 281
 282         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
 283                 count = bytes_to_frames(substream->runtime,
 284                         readl(priv->io + KIRKWOOD_PLAY_BYTE_COUNT));
 285         else
 286                 count = bytes_to_frames(substream->runtime,
 287                         readl(priv->io + KIRKWOOD_REC_BYTE_COUNT));
 288
 289         return count;
 290 }
 291
 292 struct snd_pcm_ops kirkwood_dma_ops = {
 293         .open =         kirkwood_dma_open,
 294         .close =        kirkwood_dma_close,
 295         .ioctl =        snd_pcm_lib_ioctl,
 296         .hw_params =    kirkwood_dma_hw_params,
 297         .hw_free =      kirkwood_dma_hw_free,
 298         .prepare =      kirkwood_dma_prepare,
 299         .pointer =      kirkwood_dma_pointer,
 300 };
 301
 302 static int kirkwood_dma_preallocate_dma_buffer(struct snd_pcm *pcm,
 303                 int stream)
 304 {
 305         struct snd_pcm_substream *substream = pcm->streams[stream].substream;
 306         struct snd_dma_buffer *buf = &substream->dma_buffer;
 307         size_t size = kirkwood_dma_snd_hw.buffer_bytes_max;
 308
 309         buf->dev.type = SNDRV_DMA_TYPE_DEV;
 310         buf->dev.dev = pcm->card->dev;
 311         buf->area = dma_alloc_coherent(pcm->card->dev, size,
 312                         &buf->addr, GFP_KERNEL);
 313         if (!buf->area)
 314                 return -ENOMEM;
 315         buf->bytes = size;
 316         buf->private_data = NULL;
 317
 318         return 0;
 319 }
 320
 321 static int kirkwood_dma_new(struct snd_soc_pcm_runtime *rtd)
 322 {
 323         struct snd_card *card = rtd->card->snd_card;
 324         struct snd_pcm *pcm = rtd->pcm;
 325         int ret;
 326
 327         if (!card->dev->dma_mask)
 328                 card->dev->dma_mask = &kirkwood_dma_dmamask;
 329         if (!card->dev->coherent_dma_mask)
 330                 card->dev->coherent_dma_mask = DMA_BIT_MASK(32);
 331
 332         if (pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream) {
 333                 ret = kirkwood_dma_preallocate_dma_buffer(pcm,
 334                                 SNDRV_PCM_STREAM_PLAYBACK);
 335                 if (ret)
 336                         return ret;
 337         }
 338
 339         if (pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream) {
 340                 ret = kirkwood_dma_preallocate_dma_buffer(pcm,
 341                                 SNDRV_PCM_STREAM_CAPTURE);
 342                 if (ret)
 343                         return ret;
 344         }
 345
 346         return 0;
 347 }
 348
 349 static void kirkwood_dma_free_dma_buffers(struct snd_pcm *pcm)
 350 {
 351         struct snd_pcm_substream *substream;
 352         struct snd_dma_buffer *buf;
 353         int stream;
 354
 355         for (stream = 0; stream < 2; stream++) {
 356                 substream = pcm->streams[stream].substream;
 357                 if (!substream)
 358                         continue;
 359                 buf = &substream->dma_buffer;
 360                 if (!buf->area)
 361                         continue;
 362
 363                 dma_free_coherent(pcm->card->dev, buf->bytes,
 364                                 buf->area, buf->addr);
 365                 buf->area = NULL;
 366         }
 367 }
 368
 369 static struct snd_soc_platform_driver kirkwood_soc_platform = {
 370         .ops            = &kirkwood_dma_ops,
 371         .pcm_new        = kirkwood_dma_new,
 372         .pcm_free       = kirkwood_dma_free_dma_buffers,
 373 };
 374
 375 static int kirkwood_soc_platform_probe(struct platform_device *pdev)
 376 {
 377         return snd_soc_register_platform(&pdev->dev, &kirkwood_soc_platform);
 378 }
 379
 380 static int kirkwood_soc_platform_remove(struct platform_device *pdev)
 381 {
 382         snd_soc_unregister_platform(&pdev->dev);
 383         return 0;
 384 }
 385
 386 static struct platform_driver kirkwood_pcm_driver = {
 387         .driver = {
 388                         .name = "kirkwood-pcm-audio",
 389                         .owner = THIS_MODULE,
 390         },
 391
 392         .probe = kirkwood_soc_platform_probe,
 393         .remove = kirkwood_soc_platform_remove,
 394 };
 395
 396 module_platform_driver(kirkwood_pcm_driver);
 397
 398 MODULE_AUTHOR("Arnaud Patard <arnaud.patard@rtp-net.org>");
 399 MODULE_DESCRIPTION("Marvell Kirkwood Audio DMA module");
 400 MODULE_LICENSE("GPL");
 401 MODULE_ALIAS("platform:kirkwood-pcm-audio");