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 = DMA_BIT_MASK(32);
  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         }
  75
  76         /* we've enabled only bytes interrupts ... */
  77         if (status & ~(KIRKWOOD_INT_CAUSE_PLAY_BYTES | \
  78                         KIRKWOOD_INT_CAUSE_REC_BYTES)) {
  79                 printk(KERN_WARNING "%s: unexpected interrupt %lx\n",
  80                         __func__, status);
  81                 return IRQ_NONE;
  82         }
  83
  84         /* ack int */
  85         writel(status, priv->io + KIRKWOOD_INT_CAUSE);
  86
  87         if (status & KIRKWOOD_INT_CAUSE_PLAY_BYTES)
  88                 snd_pcm_period_elapsed(prdata->play_stream);
  89
  90         if (status & KIRKWOOD_INT_CAUSE_REC_BYTES)
  91                 snd_pcm_period_elapsed(prdata->rec_stream);
  92
  93         return IRQ_HANDLED;
  94 }
  95
  96 static void
  97 kirkwood_dma_conf_mbus_windows(void __iomem *base, int win,
  98                                unsigned long dma,
  99                                const 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                 const 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         const struct mbus_dram_target_info *dram;
 131         unsigned long addr;
 132
 133         priv = snd_soc_dai_get_dma_data(cpu_dai, substream);
 134         snd_soc_set_runtime_hwparams(substream, &kirkwood_dma_snd_hw);
 135
 136         /* Ensure that all constraints linked to dma burst are fulfilled */
 137         err = snd_pcm_hw_constraint_minmax(runtime,
 138                         SNDRV_PCM_HW_PARAM_BUFFER_BYTES,
 139                         priv->burst * 2,
 140                         KIRKWOOD_AUDIO_BUF_MAX-1);
 141         if (err < 0)
 142                 return err;
 143
 144         err = snd_pcm_hw_constraint_step(runtime, 0,
 145                         SNDRV_PCM_HW_PARAM_BUFFER_BYTES,
 146                         priv->burst);
 147         if (err < 0)
 148                 return err;
 149
 150         err = snd_pcm_hw_constraint_step(substream->runtime, 0,
 151                          SNDRV_PCM_HW_PARAM_PERIOD_BYTES,
 152                          priv->burst);
 153         if (err < 0)
 154                 return err;
 155
 156         if (prdata == NULL) {
 157                 prdata = kzalloc(sizeof(struct kirkwood_dma_priv), GFP_KERNEL);
 158                 if (prdata == NULL)
 159                         return -ENOMEM;
 160
 161                 prdata->data = priv;
 162
 163                 err = request_irq(priv->irq, kirkwood_dma_irq, IRQF_SHARED,
 164                                   "kirkwood-i2s", prdata);
 165                 if (err) {
 166                         kfree(prdata);
 167                         return -EBUSY;
 168                 }
 169
 170                 snd_soc_platform_set_drvdata(platform, prdata);
 171
 172                 /*
 173                  * Enable Error interrupts. We're only ack'ing them but
 174                  * it's useful for diagnostics
 175                  */
 176                 writel((unsigned long)-1, priv->io + KIRKWOOD_ERR_MASK);
 177         }
 178
 179         dram = mv_mbus_dram_info();
 180         addr = substream->dma_buffer.addr;
 181         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
 182                 prdata->play_stream = substream;
 183                 kirkwood_dma_conf_mbus_windows(priv->io,
 184                         KIRKWOOD_PLAYBACK_WIN, addr, dram);
 185         } else {
 186                 prdata->rec_stream = substream;
 187                 kirkwood_dma_conf_mbus_windows(priv->io,
 188                         KIRKWOOD_RECORD_WIN, addr, dram);
 189         }
 190
 191         return 0;
 192 }
 193
 194 static int kirkwood_dma_close(struct snd_pcm_substream *substream)
 195 {
 196         struct snd_soc_pcm_runtime *soc_runtime = substream->private_data;
 197         struct snd_soc_dai *cpu_dai = soc_runtime->cpu_dai;
 198         struct snd_soc_platform *platform = soc_runtime->platform;
 199         struct kirkwood_dma_priv *prdata = snd_soc_platform_get_drvdata(platform);
 200         struct kirkwood_dma_data *priv;
 201
 202         priv = snd_soc_dai_get_dma_data(cpu_dai, substream);
 203
 204         if (!prdata || !priv)
 205                 return 0;
 206
 207         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
 208                 prdata->play_stream = NULL;
 209         else
 210                 prdata->rec_stream = NULL;
 211
 212         if (!prdata->play_stream && !prdata->rec_stream) {
 213                 writel(0, priv->io + KIRKWOOD_ERR_MASK);
 214                 free_irq(priv->irq, prdata);
 215                 kfree(prdata);
 216                 snd_soc_platform_set_drvdata(platform, NULL);
 217         }
 218
 219         return 0;
 220 }
 221
 222 static int kirkwood_dma_hw_params(struct snd_pcm_substream *substream,
 223                                 struct snd_pcm_hw_params *params)
 224 {
 225         struct snd_pcm_runtime *runtime = substream->runtime;
 226
 227         snd_pcm_set_runtime_buffer(substream, &substream->dma_buffer);
 228         runtime->dma_bytes = params_buffer_bytes(params);
 229
 230         return 0;
 231 }
 232
 233 static int kirkwood_dma_hw_free(struct snd_pcm_substream *substream)
 234 {
 235         snd_pcm_set_runtime_buffer(substream, NULL);
 236         return 0;
 237 }
 238
 239 static int kirkwood_dma_prepare(struct snd_pcm_substream *substream)
 240 {
 241         struct snd_pcm_runtime *runtime = substream->runtime;
 242         struct snd_soc_pcm_runtime *soc_runtime = substream->private_data;
 243         struct snd_soc_dai *cpu_dai = soc_runtime->cpu_dai;
 244         struct kirkwood_dma_data *priv;
 245         unsigned long size, count;
 246
 247         priv = snd_soc_dai_get_dma_data(cpu_dai, substream);
 248
 249         /* compute buffer size in term of "words" as requested in specs */
 250         size = frames_to_bytes(runtime, runtime->buffer_size);
 251         size = (size>>2)-1;
 252         count = snd_pcm_lib_period_bytes(substream);
 253
 254         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
 255                 writel(count, priv->io + KIRKWOOD_PLAY_BYTE_INT_COUNT);
 256                 writel(runtime->dma_addr, priv->io + KIRKWOOD_PLAY_BUF_ADDR);
 257                 writel(size, priv->io + KIRKWOOD_PLAY_BUF_SIZE);
 258         } else {
 259                 writel(count, priv->io + KIRKWOOD_REC_BYTE_INT_COUNT);
 260                 writel(runtime->dma_addr, priv->io + KIRKWOOD_REC_BUF_ADDR);
 261                 writel(size, priv->io + KIRKWOOD_REC_BUF_SIZE);
 262         }
 263
 264
 265         return 0;
 266 }
 267
 268 static snd_pcm_uframes_t kirkwood_dma_pointer(struct snd_pcm_substream
 269                                                 *substream)
 270 {
 271         struct snd_soc_pcm_runtime *soc_runtime = substream->private_data;
 272         struct snd_soc_dai *cpu_dai = soc_runtime->cpu_dai;
 273         struct kirkwood_dma_data *priv;
 274         snd_pcm_uframes_t count;
 275
 276         priv = snd_soc_dai_get_dma_data(cpu_dai, substream);
 277
 278         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
 279                 count = bytes_to_frames(substream->runtime,
 280                         readl(priv->io + KIRKWOOD_PLAY_BYTE_COUNT));
 281         else
 282                 count = bytes_to_frames(substream->runtime,
 283                         readl(priv->io + KIRKWOOD_REC_BYTE_COUNT));
 284
 285         return count;
 286 }
 287
 288 struct snd_pcm_ops kirkwood_dma_ops = {
 289         .open =         kirkwood_dma_open,
 290         .close =        kirkwood_dma_close,
 291         .ioctl =        snd_pcm_lib_ioctl,
 292         .hw_params =    kirkwood_dma_hw_params,
 293         .hw_free =      kirkwood_dma_hw_free,
 294         .prepare =      kirkwood_dma_prepare,
 295         .pointer =      kirkwood_dma_pointer,
 296 };
 297
 298 static int kirkwood_dma_preallocate_dma_buffer(struct snd_pcm *pcm,
 299                 int stream)
 300 {
 301         struct snd_pcm_substream *substream = pcm->streams[stream].substream;
 302         struct snd_dma_buffer *buf = &substream->dma_buffer;
 303         size_t size = kirkwood_dma_snd_hw.buffer_bytes_max;
 304
 305         buf->dev.type = SNDRV_DMA_TYPE_DEV;
 306         buf->dev.dev = pcm->card->dev;
 307         buf->area = dma_alloc_coherent(pcm->card->dev, size,
 308                         &buf->addr, GFP_KERNEL);
 309         if (!buf->area)
 310                 return -ENOMEM;
 311         buf->bytes = size;
 312         buf->private_data = NULL;
 313
 314         return 0;
 315 }
 316
 317 static int kirkwood_dma_new(struct snd_soc_pcm_runtime *rtd)
 318 {
 319         struct snd_card *card = rtd->card->snd_card;
 320         struct snd_pcm *pcm = rtd->pcm;
 321         int ret;
 322
 323         if (!card->dev->dma_mask)
 324                 card->dev->dma_mask = &kirkwood_dma_dmamask;
 325         if (!card->dev->coherent_dma_mask)
 326                 card->dev->coherent_dma_mask = DMA_BIT_MASK(32);
 327
 328         if (pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream) {
 329                 ret = kirkwood_dma_preallocate_dma_buffer(pcm,
 330                                 SNDRV_PCM_STREAM_PLAYBACK);
 331                 if (ret)
 332                         return ret;
 333         }
 334
 335         if (pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream) {
 336                 ret = kirkwood_dma_preallocate_dma_buffer(pcm,
 337                                 SNDRV_PCM_STREAM_CAPTURE);
 338                 if (ret)
 339                         return ret;
 340         }
 341
 342         return 0;
 343 }
 344
 345 static void kirkwood_dma_free_dma_buffers(struct snd_pcm *pcm)
 346 {
 347         struct snd_pcm_substream *substream;
 348         struct snd_dma_buffer *buf;
 349         int stream;
 350
 351         for (stream = 0; stream < 2; stream++) {
 352                 substream = pcm->streams[stream].substream;
 353                 if (!substream)
 354                         continue;
 355                 buf = &substream->dma_buffer;
 356                 if (!buf->area)
 357                         continue;
 358
 359                 dma_free_coherent(pcm->card->dev, buf->bytes,
 360                                 buf->area, buf->addr);
 361                 buf->area = NULL;
 362         }
 363 }
 364
 365 static struct snd_soc_platform_driver kirkwood_soc_platform = {
 366         .ops            = &kirkwood_dma_ops,
 367         .pcm_new        = kirkwood_dma_new,
 368         .pcm_free       = kirkwood_dma_free_dma_buffers,
 369 };
 370
 371 static int __devinit kirkwood_soc_platform_probe(struct platform_device *pdev)
 372 {
 373         return snd_soc_register_platform(&pdev->dev, &kirkwood_soc_platform);
 374 }
 375
 376 static int __devexit kirkwood_soc_platform_remove(struct platform_device *pdev)
 377 {
 378         snd_soc_unregister_platform(&pdev->dev);
 379         return 0;
 380 }
 381
 382 static struct platform_driver kirkwood_pcm_driver = {
 383         .driver = {
 384                         .name = "kirkwood-pcm-audio",
 385                         .owner = THIS_MODULE,
 386         },
 387
 388         .probe = kirkwood_soc_platform_probe,
 389         .remove = __devexit_p(kirkwood_soc_platform_remove),
 390 };
 391
 392 module_platform_driver(kirkwood_pcm_driver);
 393
 394 MODULE_AUTHOR("Arnaud Patard <arnaud.patard@rtp-net.org>");
 395 MODULE_DESCRIPTION("Marvell Kirkwood Audio DMA module");
 396 MODULE_LICENSE("GPL");
 397 MODULE_ALIAS("platform:kirkwood-pcm-audio");