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_44100 | \
  26          SNDRV_PCM_RATE_48000 | SNDRV_PCM_RATE_96000)
  27 #define KIRKWOOD_FORMATS \
  28         (SNDRV_PCM_FMTBIT_S16_LE | \
  29          SNDRV_PCM_FMTBIT_S24_LE | \
  30          SNDRV_PCM_FMTBIT_S32_LE)
  31
  32 struct kirkwood_dma_priv {
  33         struct snd_pcm_substream *play_stream;
  34         struct snd_pcm_substream *rec_stream;
  35         struct kirkwood_dma_data *data;
  36 };
  37
  38 static struct snd_pcm_hardware kirkwood_dma_snd_hw = {
  39         .info = (SNDRV_PCM_INFO_INTERLEAVED |
  40                  SNDRV_PCM_INFO_MMAP |
  41                  SNDRV_PCM_INFO_MMAP_VALID |
  42                  SNDRV_PCM_INFO_BLOCK_TRANSFER |
  43                  SNDRV_PCM_INFO_PAUSE),
  44         .formats                = KIRKWOOD_FORMATS,
  45         .rates                  = KIRKWOOD_RATES,
  46         .rate_min               = 44100,
  47         .rate_max               = 96000,
  48         .channels_min           = 1,
  49         .channels_max           = 2,
  50         .buffer_bytes_max       = KIRKWOOD_SND_MAX_PERIOD_BYTES * KIRKWOOD_SND_MAX_PERIODS,
  51         .period_bytes_min       = KIRKWOOD_SND_MIN_PERIOD_BYTES,
  52         .period_bytes_max       = KIRKWOOD_SND_MAX_PERIOD_BYTES,
  53         .periods_min            = KIRKWOOD_SND_MIN_PERIODS,
  54         .periods_max            = KIRKWOOD_SND_MAX_PERIODS,
  55         .fifo_size              = 0,
  56 };
  57
  58 static u64 kirkwood_dma_dmamask = 0xFFFFFFFFUL;
  59
  60 static irqreturn_t kirkwood_dma_irq(int irq, void *dev_id)
  61 {
  62         struct kirkwood_dma_priv *prdata = dev_id;
  63         struct kirkwood_dma_data *priv = prdata->data;
  64         unsigned long mask, status, cause;
  65
  66         mask = readl(priv->io + KIRKWOOD_INT_MASK);
  67         status = readl(priv->io + KIRKWOOD_INT_CAUSE) & mask;
  68
  69         cause = readl(priv->io + KIRKWOOD_ERR_CAUSE);
  70         if (unlikely(cause)) {
  71                 printk(KERN_WARNING "%s: got err interrupt 0x%lx\n",
  72                                 __func__, cause);
  73                 writel(cause, priv->io + KIRKWOOD_ERR_CAUSE);
  74                 return IRQ_HANDLED;
  75         }
  76
  77         /* we've enabled only bytes interrupts ... */
  78         if (status & ~(KIRKWOOD_INT_CAUSE_PLAY_BYTES | \
  79                         KIRKWOOD_INT_CAUSE_REC_BYTES)) {
  80                 printk(KERN_WARNING "%s: unexpected interrupt %lx\n",
  81                         __func__, status);
  82                 return IRQ_NONE;
  83         }
  84
  85         /* ack int */
  86         writel(status, priv->io + KIRKWOOD_INT_CAUSE);
  87
  88         if (status & KIRKWOOD_INT_CAUSE_PLAY_BYTES)
  89                 snd_pcm_period_elapsed(prdata->play_stream);
  90
  91         if (status & KIRKWOOD_INT_CAUSE_REC_BYTES)
  92                 snd_pcm_period_elapsed(prdata->rec_stream);
  93
  94         return IRQ_HANDLED;
  95 }
  96
  97 static void kirkwood_dma_conf_mbus_windows(void __iomem *base, int win,
  98                                         unsigned long dma,
  99                                         struct mbus_dram_target_info *dram)
 100 {
 101         int i;
 102
 103         /* First disable and clear windows */
 104         writel(0, base + KIRKWOOD_AUDIO_WIN_CTRL_REG(win));
 105         writel(0, base + KIRKWOOD_AUDIO_WIN_BASE_REG(win));
 106
 107         /* try to find matching cs for current dma address */
 108         for (i = 0; i < dram->num_cs; i++) {
 109                 struct mbus_dram_window *cs = dram->cs + i;
 110                 if ((cs->base & 0xffff0000) < (dma & 0xffff0000)) {
 111                         writel(cs->base & 0xffff0000,
 112                                 base + KIRKWOOD_AUDIO_WIN_BASE_REG(win));
 113                         writel(((cs->size - 1) & 0xffff0000) |
 114                                 (cs->mbus_attr << 8) |
 115                                 (dram->mbus_dram_target_id << 4) | 1,
 116                                 base + KIRKWOOD_AUDIO_WIN_CTRL_REG(win));
 117                 }
 118         }
 119 }
 120
 121 static int kirkwood_dma_open(struct snd_pcm_substream *substream)
 122 {
 123         int err;
 124         struct snd_pcm_runtime *runtime = substream->runtime;
 125         struct snd_soc_pcm_runtime *soc_runtime = substream->private_data;
 126         struct snd_soc_platform *platform = soc_runtime->platform;
 127         struct snd_soc_dai *cpu_dai = soc_runtime->cpu_dai;
 128         struct kirkwood_dma_data *priv;
 129         struct kirkwood_dma_priv *prdata = snd_soc_platform_get_drvdata(platform);
 130         unsigned long addr;
 131
 132         priv = snd_soc_dai_get_dma_data(cpu_dai, substream);
 133         snd_soc_set_runtime_hwparams(substream, &kirkwood_dma_snd_hw);
 134
 135         /* Ensure that all constraints linked to dma burst are fulfilled */
 136         err = snd_pcm_hw_constraint_minmax(runtime,
 137                         SNDRV_PCM_HW_PARAM_BUFFER_BYTES,
 138                         priv->burst * 2,
 139                         KIRKWOOD_AUDIO_BUF_MAX-1);
 140         if (err < 0)
 141                 return err;
 142
 143         err = snd_pcm_hw_constraint_step(runtime, 0,
 144                         SNDRV_PCM_HW_PARAM_BUFFER_BYTES,
 145                         priv->burst);
 146         if (err < 0)
 147                 return err;
 148
 149         err = snd_pcm_hw_constraint_step(substream->runtime, 0,
 150                          SNDRV_PCM_HW_PARAM_PERIOD_BYTES,
 151                          priv->burst);
 152         if (err < 0)
 153                 return err;
 154
 155         if (prdata == NULL) {
 156                 prdata = kzalloc(sizeof(struct kirkwood_dma_priv), GFP_KERNEL);
 157                 if (prdata == NULL)
 158                         return -ENOMEM;
 159
 160                 prdata->data = priv;
 161
 162                 err = request_irq(priv->irq, kirkwood_dma_irq, IRQF_SHARED,
 163                                   "kirkwood-i2s", prdata);
 164                 if (err) {
 165                         kfree(prdata);
 166                         return -EBUSY;
 167                 }
 168
 169                 snd_soc_platform_set_drvdata(platform, prdata);
 170
 171                 /*
 172                  * Enable Error interrupts. We're only ack'ing them but
 173                  * it's useful for diagnostics
 174                  */
 175                 writel((unsigned long)-1, priv->io + KIRKWOOD_ERR_MASK);
 176         }
 177
 178         addr = virt_to_phys(substream->dma_buffer.area);
 179         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
 180                 prdata->play_stream = substream;
 181                 kirkwood_dma_conf_mbus_windows(priv->io,
 182                         KIRKWOOD_PLAYBACK_WIN, addr, priv->dram);
 183         } else {
 184                 prdata->rec_stream = substream;
 185                 kirkwood_dma_conf_mbus_windows(priv->io,
 186                         KIRKWOOD_RECORD_WIN, addr, priv->dram);
 187         }
 188
 189         return 0;
 190 }
 191
 192 static int kirkwood_dma_close(struct snd_pcm_substream *substream)
 193 {
 194         struct snd_soc_pcm_runtime *soc_runtime = substream->private_data;
 195         struct snd_soc_dai *cpu_dai = soc_runtime->cpu_dai;
 196         struct snd_soc_platform *platform = soc_runtime->platform;
 197         struct kirkwood_dma_priv *prdata = snd_soc_platform_get_drvdata(platform);
 198         struct kirkwood_dma_data *priv;
 199
 200         priv = snd_soc_dai_get_dma_data(cpu_dai, substream);
 201
 202         if (!prdata || !priv)
 203                 return 0;
 204
 205         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
 206                 prdata->play_stream = NULL;
 207         else
 208                 prdata->rec_stream = NULL;
 209
 210         if (!prdata->play_stream && !prdata->rec_stream) {
 211                 writel(0, priv->io + KIRKWOOD_ERR_MASK);
 212                 free_irq(priv->irq, prdata);
 213                 kfree(prdata);
 214                 snd_soc_platform_set_drvdata(platform, NULL);
 215         }
 216
 217         return 0;
 218 }
 219
 220 static int kirkwood_dma_hw_params(struct snd_pcm_substream *substream,
 221                                 struct snd_pcm_hw_params *params)
 222 {
 223         struct snd_pcm_runtime *runtime = substream->runtime;
 224
 225         snd_pcm_set_runtime_buffer(substream, &substream->dma_buffer);
 226         runtime->dma_bytes = params_buffer_bytes(params);
 227
 228         return 0;
 229 }
 230
 231 static int kirkwood_dma_hw_free(struct snd_pcm_substream *substream)
 232 {
 233         snd_pcm_set_runtime_buffer(substream, NULL);
 234         return 0;
 235 }
 236
 237 static int kirkwood_dma_prepare(struct snd_pcm_substream *substream)
 238 {
 239         struct snd_pcm_runtime *runtime = substream->runtime;
 240         struct snd_soc_pcm_runtime *soc_runtime = substream->private_data;
 241         struct snd_soc_dai *cpu_dai = soc_runtime->cpu_dai;
 242         struct kirkwood_dma_data *priv;
 243         unsigned long size, count;
 244
 245         priv = snd_soc_dai_get_dma_data(cpu_dai, substream);
 246
 247         /* compute buffer size in term of "words" as requested in specs */
 248         size = frames_to_bytes(runtime, runtime->buffer_size);
 249         size = (size>>2)-1;
 250         count = snd_pcm_lib_period_bytes(substream);
 251
 252         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
 253                 writel(count, priv->io + KIRKWOOD_PLAY_BYTE_INT_COUNT);
 254                 writel(runtime->dma_addr, priv->io + KIRKWOOD_PLAY_BUF_ADDR);
 255                 writel(size, priv->io + KIRKWOOD_PLAY_BUF_SIZE);
 256         } else {
 257                 writel(count, priv->io + KIRKWOOD_REC_BYTE_INT_COUNT);
 258                 writel(runtime->dma_addr, priv->io + KIRKWOOD_REC_BUF_ADDR);
 259                 writel(size, priv->io + KIRKWOOD_REC_BUF_SIZE);
 260         }
 261
 262
 263         return 0;
 264 }
 265
 266 static snd_pcm_uframes_t kirkwood_dma_pointer(struct snd_pcm_substream
 267                                                 *substream)
 268 {
 269         struct snd_soc_pcm_runtime *soc_runtime = substream->private_data;
 270         struct snd_soc_dai *cpu_dai = soc_runtime->cpu_dai;
 271         struct kirkwood_dma_data *priv;
 272         snd_pcm_uframes_t count;
 273
 274         priv = snd_soc_dai_get_dma_data(cpu_dai, substream);
 275
 276         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
 277                 count = bytes_to_frames(substream->runtime,
 278                         readl(priv->io + KIRKWOOD_PLAY_BYTE_COUNT));
 279         else
 280                 count = bytes_to_frames(substream->runtime,
 281                         readl(priv->io + KIRKWOOD_REC_BYTE_COUNT));
 282
 283         return count;
 284 }
 285
 286 struct snd_pcm_ops kirkwood_dma_ops = {
 287         .open =         kirkwood_dma_open,
 288         .close =        kirkwood_dma_close,
 289         .ioctl =        snd_pcm_lib_ioctl,
 290         .hw_params =    kirkwood_dma_hw_params,
 291         .hw_free =      kirkwood_dma_hw_free,
 292         .prepare =      kirkwood_dma_prepare,
 293         .pointer =      kirkwood_dma_pointer,
 294 };
 295
 296 static int kirkwood_dma_preallocate_dma_buffer(struct snd_pcm *pcm,
 297                 int stream)
 298 {
 299         struct snd_pcm_substream *substream = pcm->streams[stream].substream;
 300         struct snd_dma_buffer *buf = &substream->dma_buffer;
 301         size_t size = kirkwood_dma_snd_hw.buffer_bytes_max;
 302
 303         buf->dev.type = SNDRV_DMA_TYPE_DEV;
 304         buf->dev.dev = pcm->card->dev;
 305         buf->area = dma_alloc_coherent(pcm->card->dev, size,
 306                         &buf->addr, GFP_KERNEL);
 307         if (!buf->area)
 308                 return -ENOMEM;
 309         buf->bytes = size;
 310         buf->private_data = NULL;
 311
 312         return 0;
 313 }
 314
 315 static int kirkwood_dma_new(struct snd_card *card,
 316                 struct snd_soc_dai *dai, struct snd_pcm *pcm)
 317 {
 318         int ret;
 319
 320         if (!card->dev->dma_mask)
 321                 card->dev->dma_mask = &kirkwood_dma_dmamask;
 322         if (!card->dev->coherent_dma_mask)
 323                 card->dev->coherent_dma_mask = 0xffffffff;
 324
 325         if (dai->driver->playback.channels_min) {
 326                 ret = kirkwood_dma_preallocate_dma_buffer(pcm,
 327                                 SNDRV_PCM_STREAM_PLAYBACK);
 328                 if (ret)
 329                         return ret;
 330         }
 331
 332         if (dai->driver->capture.channels_min) {
 333                 ret = kirkwood_dma_preallocate_dma_buffer(pcm,
 334                                 SNDRV_PCM_STREAM_CAPTURE);
 335                 if (ret)
 336                         return ret;
 337         }
 338
 339         return 0;
 340 }
 341
 342 static void kirkwood_dma_free_dma_buffers(struct snd_pcm *pcm)
 343 {
 344         struct snd_pcm_substream *substream;
 345         struct snd_dma_buffer *buf;
 346         int stream;
 347
 348         for (stream = 0; stream < 2; stream++) {
 349                 substream = pcm->streams[stream].substream;
 350                 if (!substream)
 351                         continue;
 352                 buf = &substream->dma_buffer;
 353                 if (!buf->area)
 354                         continue;
 355
 356                 dma_free_coherent(pcm->card->dev, buf->bytes,
 357                                 buf->area, buf->addr);
 358                 buf->area = NULL;
 359         }
 360 }
 361
 362 static struct snd_soc_platform_driver kirkwood_soc_platform = {
 363         .ops            = &kirkwood_dma_ops,
 364         .pcm_new        = kirkwood_dma_new,
 365         .pcm_free       = kirkwood_dma_free_dma_buffers,
 366 };
 367
 368 static int __devinit kirkwood_soc_platform_probe(struct platform_device *pdev)
 369 {
 370         return snd_soc_register_platform(&pdev->dev, &kirkwood_soc_platform);
 371 }
 372
 373 static int __devexit kirkwood_soc_platform_remove(struct platform_device *pdev)
 374 {
 375         snd_soc_unregister_platform(&pdev->dev);
 376         return 0;
 377 }
 378
 379 static struct platform_driver kirkwood_pcm_driver = {
 380         .driver = {
 381                         .name = "kirkwood-pcm-audio",
 382                         .owner = THIS_MODULE,
 383         },
 384
 385         .probe = kirkwood_soc_platform_probe,
 386         .remove = __devexit_p(kirkwood_soc_platform_remove),
 387 };
 388
 389 static int __init kirkwood_pcm_init(void)
 390 {
 391         return platform_driver_register(&kirkwood_pcm_driver);
 392 }
 393 module_init(kirkwood_pcm_init);
 394
 395 static void __exit kirkwood_pcm_exit(void)
 396 {
 397         platform_driver_unregister(&kirkwood_pcm_driver);
 398 }
 399 module_exit(kirkwood_pcm_exit);
 400
 401 MODULE_AUTHOR("Arnaud Patard <arnaud.patard@rtp-net.org>");
 402 MODULE_DESCRIPTION("Marvell Kirkwood Audio DMA module");
 403 MODULE_LICENSE("GPL");
 404 MODULE_ALIAS("platform:kirkwood-pcm-audio");