Pileus Git - ~andy/linux/blob - 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                 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
  98 kirkwood_dma_conf_mbus_windows(void __iomem *base, int win,
  99                                unsigned long dma,
 100                                const struct mbus_dram_target_info *dram)
 101 {
 102         int i;
 103
 104         /* First disable and clear windows */
 105         writel(0, base + KIRKWOOD_AUDIO_WIN_CTRL_REG(win));
 106         writel(0, base + KIRKWOOD_AUDIO_WIN_BASE_REG(win));
 107
 108         /* try to find matching cs for current dma address */
 109         for (i = 0; i < dram->num_cs; i++) {
 110                 const struct mbus_dram_window *cs = dram->cs + i;
 111                 if ((cs->base & 0xffff0000) < (dma & 0xffff0000)) {
 112                         writel(cs->base & 0xffff0000,
 113                                 base + KIRKWOOD_AUDIO_WIN_BASE_REG(win));
 114                         writel(((cs->size - 1) & 0xffff0000) |
 115                                 (cs->mbus_attr << 8) |
 116                                 (dram->mbus_dram_target_id << 4) | 1,
 117                                 base + KIRKWOOD_AUDIO_WIN_CTRL_REG(win));
 118                 }
 119         }
 120 }
 121
 122 static int kirkwood_dma_open(struct snd_pcm_substream *substream)
 123 {
 124         int err;
 125         struct snd_pcm_runtime *runtime = substream->runtime;
 126         struct snd_soc_pcm_runtime *soc_runtime = substream->private_data;
 127         struct snd_soc_platform *platform = soc_runtime->platform;
 128         struct snd_soc_dai *cpu_dai = soc_runtime->cpu_dai;
 129         struct kirkwood_dma_data *priv;
 130         struct kirkwood_dma_priv *prdata = snd_soc_platform_get_drvdata(platform);
 131         const struct mbus_dram_target_info *dram;
 132         unsigned long addr;
 133
 134         priv = snd_soc_dai_get_dma_data(cpu_dai, substream);
 135         snd_soc_set_runtime_hwparams(substream, &kirkwood_dma_snd_hw);
 136
 137         /* Ensure that all constraints linked to dma burst are fulfilled */
 138         err = snd_pcm_hw_constraint_minmax(runtime,
 139                         SNDRV_PCM_HW_PARAM_BUFFER_BYTES,
 140                         priv->burst * 2,
 141                         KIRKWOOD_AUDIO_BUF_MAX-1);
 142         if (err < 0)
 143                 return err;
 144
 145         err = snd_pcm_hw_constraint_step(runtime, 0,
 146                         SNDRV_PCM_HW_PARAM_BUFFER_BYTES,
 147                         priv->burst);
 148         if (err < 0)
 149                 return err;
 150
 151         err = snd_pcm_hw_constraint_step(substream->runtime, 0,
 152                          SNDRV_PCM_HW_PARAM_PERIOD_BYTES,
 153                          priv->burst);
 154         if (err < 0)
 155                 return err;
 156
 157         if (prdata == NULL) {
 158                 prdata = kzalloc(sizeof(struct kirkwood_dma_priv), GFP_KERNEL);
 159                 if (prdata == NULL)
 160                         return -ENOMEM;
 161
 162                 prdata->data = priv;
 163
 164                 err = request_irq(priv->irq, kirkwood_dma_irq, IRQF_SHARED,
 165                                   "kirkwood-i2s", prdata);
 166                 if (err) {
 167                         kfree(prdata);
 168                         return -EBUSY;
 169                 }
 170
 171                 snd_soc_platform_set_drvdata(platform, prdata);
 172
 173                 /*
 174                  * Enable Error interrupts. We're only ack'ing them but
 175                  * it's useful for diagnostics
 176                  */
 177                 writel((unsigned long)-1, priv->io + KIRKWOOD_ERR_MASK);
 178         }
 179
 180         dram = mv_mbus_dram_info();
 181         addr = virt_to_phys(substream->dma_buffer.area);
 182         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
 183                 prdata->play_stream = substream;
 184                 kirkwood_dma_conf_mbus_windows(priv->io,
 185                         KIRKWOOD_PLAYBACK_WIN, addr, dram);
 186         } else {
 187                 prdata->rec_stream = substream;
 188                 kirkwood_dma_conf_mbus_windows(priv->io,
 189                         KIRKWOOD_RECORD_WIN, addr, dram);
 190         }
 191
 192         return 0;
 193 }
 194
 195 static int kirkwood_dma_close(struct snd_pcm_substream *substream)
 196 {
 197         struct snd_soc_pcm_runtime *soc_runtime = substream->private_data;
 198         struct snd_soc_dai *cpu_dai = soc_runtime->cpu_dai;
 199         struct snd_soc_platform *platform = soc_runtime->platform;
 200         struct kirkwood_dma_priv *prdata = snd_soc_platform_get_drvdata(platform);
 201         struct kirkwood_dma_data *priv;
 202
 203         priv = snd_soc_dai_get_dma_data(cpu_dai, substream);
 204
 205         if (!prdata || !priv)
 206                 return 0;
 207
 208         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
 209                 prdata->play_stream = NULL;
 210         else
 211                 prdata->rec_stream = NULL;
 212
 213         if (!prdata->play_stream && !prdata->rec_stream) {
 214                 writel(0, priv->io + KIRKWOOD_ERR_MASK);
 215                 free_irq(priv->irq, prdata);
 216                 kfree(prdata);
 217                 snd_soc_platform_set_drvdata(platform, NULL);
 218         }
 219
 220         return 0;
 221 }
 222
 223 static int kirkwood_dma_hw_params(struct snd_pcm_substream *substream,
 224                                 struct snd_pcm_hw_params *params)
 225 {
 226         struct snd_pcm_runtime *runtime = substream->runtime;
 227
 228         snd_pcm_set_runtime_buffer(substream, &substream->dma_buffer);
 229         runtime->dma_bytes = params_buffer_bytes(params);
 230
 231         return 0;
 232 }
 233
 234 static int kirkwood_dma_hw_free(struct snd_pcm_substream *substream)
 235 {
 236         snd_pcm_set_runtime_buffer(substream, NULL);
 237         return 0;
 238 }
 239
 240 static int kirkwood_dma_prepare(struct snd_pcm_substream *substream)
 241 {
 242         struct snd_pcm_runtime *runtime = substream->runtime;
 243         struct snd_soc_pcm_runtime *soc_runtime = substream->private_data;
 244         struct snd_soc_dai *cpu_dai = soc_runtime->cpu_dai;
 245         struct kirkwood_dma_data *priv;
 246         unsigned long size, count;
 247
 248         priv = snd_soc_dai_get_dma_data(cpu_dai, substream);
 249
 250         /* compute buffer size in term of "words" as requested in specs */
 251         size = frames_to_bytes(runtime, runtime->buffer_size);
 252         size = (size>>2)-1;
 253         count = snd_pcm_lib_period_bytes(substream);
 254
 255         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
 256                 writel(count, priv->io + KIRKWOOD_PLAY_BYTE_INT_COUNT);
 257                 writel(runtime->dma_addr, priv->io + KIRKWOOD_PLAY_BUF_ADDR);
 258                 writel(size, priv->io + KIRKWOOD_PLAY_BUF_SIZE);
 259         } else {
 260                 writel(count, priv->io + KIRKWOOD_REC_BYTE_INT_COUNT);
 261                 writel(runtime->dma_addr, priv->io + KIRKWOOD_REC_BUF_ADDR);
 262                 writel(size, priv->io + KIRKWOOD_REC_BUF_SIZE);
 263         }
 264
 265
 266         return 0;
 267 }
 268
 269 static snd_pcm_uframes_t kirkwood_dma_pointer(struct snd_pcm_substream
 270                                                 *substream)
 271 {
 272         struct snd_soc_pcm_runtime *soc_runtime = substream->private_data;
 273         struct snd_soc_dai *cpu_dai = soc_runtime->cpu_dai;
 274         struct kirkwood_dma_data *priv;
 275         snd_pcm_uframes_t count;
 276
 277         priv = snd_soc_dai_get_dma_data(cpu_dai, substream);
 278
 279         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
 280                 count = bytes_to_frames(substream->runtime,
 281                         readl(priv->io + KIRKWOOD_PLAY_BYTE_COUNT));
 282         else
 283                 count = bytes_to_frames(substream->runtime,
 284                         readl(priv->io + KIRKWOOD_REC_BYTE_COUNT));
 285
 286         return count;
 287 }
 288
 289 struct snd_pcm_ops kirkwood_dma_ops = {
 290         .open =         kirkwood_dma_open,
 291         .close =        kirkwood_dma_close,
 292         .ioctl =        snd_pcm_lib_ioctl,
 293         .hw_params =    kirkwood_dma_hw_params,
 294         .hw_free =      kirkwood_dma_hw_free,
 295         .prepare =      kirkwood_dma_prepare,
 296         .pointer =      kirkwood_dma_pointer,
 297 };
 298
 299 static int kirkwood_dma_preallocate_dma_buffer(struct snd_pcm *pcm,
 300                 int stream)
 301 {
 302         struct snd_pcm_substream *substream = pcm->streams[stream].substream;
 303         struct snd_dma_buffer *buf = &substream->dma_buffer;
 304         size_t size = kirkwood_dma_snd_hw.buffer_bytes_max;
 305
 306         buf->dev.type = SNDRV_DMA_TYPE_DEV;
 307         buf->dev.dev = pcm->card->dev;
 308         buf->area = dma_alloc_coherent(pcm->card->dev, size,
 309                         &buf->addr, GFP_KERNEL);
 310         if (!buf->area)
 311                 return -ENOMEM;
 312         buf->bytes = size;
 313         buf->private_data = NULL;
 314
 315         return 0;
 316 }
 317
 318 static int kirkwood_dma_new(struct snd_soc_pcm_runtime *rtd)
 319 {
 320         struct snd_card *card = rtd->card->snd_card;
 321         struct snd_pcm *pcm = rtd->pcm;
 322         int ret;
 323
 324         if (!card->dev->dma_mask)
 325                 card->dev->dma_mask = &kirkwood_dma_dmamask;
 326         if (!card->dev->coherent_dma_mask)
 327                 card->dev->coherent_dma_mask = DMA_BIT_MASK(32);
 328
 329         if (pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream) {
 330                 ret = kirkwood_dma_preallocate_dma_buffer(pcm,
 331                                 SNDRV_PCM_STREAM_PLAYBACK);
 332                 if (ret)
 333                         return ret;
 334         }
 335
 336         if (pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream) {
 337                 ret = kirkwood_dma_preallocate_dma_buffer(pcm,
 338                                 SNDRV_PCM_STREAM_CAPTURE);
 339                 if (ret)
 340                         return ret;
 341         }
 342
 343         return 0;
 344 }
 345
 346 static void kirkwood_dma_free_dma_buffers(struct snd_pcm *pcm)
 347 {
 348         struct snd_pcm_substream *substream;
 349         struct snd_dma_buffer *buf;
 350         int stream;
 351
 352         for (stream = 0; stream < 2; stream++) {
 353                 substream = pcm->streams[stream].substream;
 354                 if (!substream)
 355                         continue;
 356                 buf = &substream->dma_buffer;
 357                 if (!buf->area)
 358                         continue;
 359
 360                 dma_free_coherent(pcm->card->dev, buf->bytes,
 361                                 buf->area, buf->addr);
 362                 buf->area = NULL;
 363         }
 364 }
 365
 366 static struct snd_soc_platform_driver kirkwood_soc_platform = {
 367         .ops            = &kirkwood_dma_ops,
 368         .pcm_new        = kirkwood_dma_new,
 369         .pcm_free       = kirkwood_dma_free_dma_buffers,
 370 };
 371
 372 static int __devinit kirkwood_soc_platform_probe(struct platform_device *pdev)
 373 {
 374         return snd_soc_register_platform(&pdev->dev, &kirkwood_soc_platform);
 375 }
 376
 377 static int __devexit kirkwood_soc_platform_remove(struct platform_device *pdev)
 378 {
 379         snd_soc_unregister_platform(&pdev->dev);
 380         return 0;
 381 }
 382
 383 static struct platform_driver kirkwood_pcm_driver = {
 384         .driver = {
 385                         .name = "kirkwood-pcm-audio",
 386                         .owner = THIS_MODULE,
 387         },
 388
 389         .probe = kirkwood_soc_platform_probe,
 390         .remove = __devexit_p(kirkwood_soc_platform_remove),
 391 };
 392
 393 module_platform_driver(kirkwood_pcm_driver);
 394
 395 MODULE_AUTHOR("Arnaud Patard <arnaud.patard@rtp-net.org>");
 396 MODULE_DESCRIPTION("Marvell Kirkwood Audio DMA module");
 397 MODULE_LICENSE("GPL");
 398 MODULE_ALIAS("platform:kirkwood-pcm-audio");