sound/soc/kirkwood/kirkwood-dma.c

   1 /*
   2  * kirkwood-dma.c
   3  *
   4  * (c) 2010 Arnaud Patard <apatard@mandriva.com>
   5  *
   6  *  This program is free software; you can redistribute  it and/or modify it
   7  *  under  the terms of  the GNU General  Public License as published by the
   8  *  Free Software Foundation;  either version 2 of the  License, or (at your
   9  *  option) any later version.
  10  */
  11
  12 #include <linux/init.h>
  13 #include <linux/module.h>
  14 #include <linux/device.h>
  15 #include <linux/io.h>
  16 #include <linux/slab.h>
  17 #include <linux/interrupt.h>
  18 #include <linux/dma-mapping.h>
  19 #include <linux/mbus.h>
  20 #include <sound/soc.h>
  21 #include "kirkwood-dma.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_dai *cpu_dai = soc_runtime->dai->cpu_dai;
 127         struct kirkwood_dma_data *priv;
 128         struct kirkwood_dma_priv *prdata = cpu_dai->private_data;
 129         unsigned long addr;
 130
 131         priv = snd_soc_dai_get_dma_data(cpu_dai, substream);
 132         snd_soc_set_runtime_hwparams(substream, &kirkwood_dma_snd_hw);
 133
 134         /* Ensure that all constraints linked to dma burst are fullfilled */
 135         err = snd_pcm_hw_constraint_minmax(runtime,
 136                         SNDRV_PCM_HW_PARAM_BUFFER_BYTES,
 137                         priv->burst * 2,
 138                         KIRKWOOD_AUDIO_BUF_MAX-1);
 139         if (err < 0)
 140                 return err;
 141
 142         err = snd_pcm_hw_constraint_step(runtime, 0,
 143                         SNDRV_PCM_HW_PARAM_BUFFER_BYTES,
 144                         priv->burst);
 145         if (err < 0)
 146                 return err;
 147
 148         err = snd_pcm_hw_constraint_step(substream->runtime, 0,
 149                          SNDRV_PCM_HW_PARAM_PERIOD_BYTES,
 150                          priv->burst);
 151         if (err < 0)
 152                 return err;
 153
 154         if (soc_runtime->dai->cpu_dai->private_data == NULL) {
 155                 prdata = kzalloc(sizeof(struct kirkwood_dma_priv), GFP_KERNEL);
 156                 if (prdata == NULL)
 157                         return -ENOMEM;
 158
 159                 prdata->data = priv;
 160
 161                 err = request_irq(priv->irq, kirkwood_dma_irq, IRQF_SHARED,
 162                                   "kirkwood-i2s", prdata);
 163                 if (err) {
 164                         kfree(prdata);
 165                         return -EBUSY;
 166                 }
 167
 168                 soc_runtime->dai->cpu_dai->private_data = prdata;
 169
 170                 /*
 171                  * Enable Error interrupts. We're only ack'ing them but
 172                  * it's usefull for diagnostics
 173                  */
 174                 writel((unsigned long)-1, priv->io + KIRKWOOD_ERR_MASK);
 175         }
 176
 177         addr = virt_to_phys(substream->dma_buffer.area);
 178         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
 179                 prdata->play_stream = substream;
 180                 kirkwood_dma_conf_mbus_windows(priv->io,
 181                         KIRKWOOD_PLAYBACK_WIN, addr, priv->dram);
 182         } else {
 183                 prdata->rec_stream = substream;
 184                 kirkwood_dma_conf_mbus_windows(priv->io,
 185                         KIRKWOOD_RECORD_WIN, addr, priv->dram);
 186         }
 187
 188         return 0;
 189 }
 190
 191 static int kirkwood_dma_close(struct snd_pcm_substream *substream)
 192 {
 193         struct snd_soc_pcm_runtime *soc_runtime = substream->private_data;
 194         struct snd_soc_dai *cpu_dai = soc_runtime->dai->cpu_dai;
 195         struct kirkwood_dma_priv *prdata = cpu_dai->private_data;
 196         struct kirkwood_dma_data *priv;
 197
 198         priv = snd_soc_dai_get_dma_data(cpu_dai, substream);
 199
 200         if (!prdata || !priv)
 201                 return 0;
 202
 203         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
 204                 prdata->play_stream = NULL;
 205         else
 206                 prdata->rec_stream = NULL;
 207
 208         if (!prdata->play_stream && !prdata->rec_stream) {
 209                 writel(0, priv->io + KIRKWOOD_ERR_MASK);
 210                 free_irq(priv->irq, prdata);
 211                 kfree(prdata);
 212                 soc_runtime->dai->cpu_dai->private_data = NULL;
 213         }
 214
 215         return 0;
 216 }
 217
 218 static int kirkwood_dma_hw_params(struct snd_pcm_substream *substream,
 219                                 struct snd_pcm_hw_params *params)
 220 {
 221         struct snd_pcm_runtime *runtime = substream->runtime;
 222
 223         snd_pcm_set_runtime_buffer(substream, &substream->dma_buffer);
 224         runtime->dma_bytes = params_buffer_bytes(params);
 225
 226         return 0;
 227 }
 228
 229 static int kirkwood_dma_hw_free(struct snd_pcm_substream *substream)
 230 {
 231         snd_pcm_set_runtime_buffer(substream, NULL);
 232         return 0;
 233 }
 234
 235 static int kirkwood_dma_prepare(struct snd_pcm_substream *substream)
 236 {
 237         struct snd_pcm_runtime *runtime = substream->runtime;
 238         struct snd_soc_pcm_runtime *soc_runtime = substream->private_data;
 239         struct snd_soc_dai *cpu_dai = soc_runtime->dai->cpu_dai;
 240         struct kirkwood_dma_data *priv;
 241         unsigned long size, count;
 242
 243         priv = snd_soc_dai_get_dma_data(cpu_dai, substream);
 244
 245         /* compute buffer size in term of "words" as requested in specs */
 246         size = frames_to_bytes(runtime, runtime->buffer_size);
 247         size = (size>>2)-1;
 248         count = snd_pcm_lib_period_bytes(substream);
 249
 250         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
 251                 writel(count, priv->io + KIRKWOOD_PLAY_BYTE_INT_COUNT);
 252                 writel(runtime->dma_addr, priv->io + KIRKWOOD_PLAY_BUF_ADDR);
 253                 writel(size, priv->io + KIRKWOOD_PLAY_BUF_SIZE);
 254         } else {
 255                 writel(count, priv->io + KIRKWOOD_REC_BYTE_INT_COUNT);
 256                 writel(runtime->dma_addr, priv->io + KIRKWOOD_REC_BUF_ADDR);
 257                 writel(size, priv->io + KIRKWOOD_REC_BUF_SIZE);
 258         }
 259
 260
 261         return 0;
 262 }
 263
 264 static snd_pcm_uframes_t kirkwood_dma_pointer(struct snd_pcm_substream
 265                                                 *substream)
 266 {
 267         struct snd_soc_pcm_runtime *soc_runtime = substream->private_data;
 268         struct snd_soc_dai *cpu_dai = soc_runtime->dai->cpu_dai;
 269         struct kirkwood_dma_data *priv;
 270         snd_pcm_uframes_t count;
 271
 272         priv = snd_soc_dai_get_dma_data(cpu_dai, substream);
 273
 274         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
 275                 count = bytes_to_frames(substream->runtime,
 276                         readl(priv->io + KIRKWOOD_PLAY_BYTE_COUNT));
 277         else
 278                 count = bytes_to_frames(substream->runtime,
 279                         readl(priv->io + KIRKWOOD_REC_BYTE_COUNT));
 280
 281         return count;
 282 }
 283
 284 struct snd_pcm_ops kirkwood_dma_ops = {
 285         .open =         kirkwood_dma_open,
 286         .close =        kirkwood_dma_close,
 287         .ioctl =        snd_pcm_lib_ioctl,
 288         .hw_params =    kirkwood_dma_hw_params,
 289         .hw_free =      kirkwood_dma_hw_free,
 290         .prepare =      kirkwood_dma_prepare,
 291         .pointer =      kirkwood_dma_pointer,
 292 };
 293
 294 static int kirkwood_dma_preallocate_dma_buffer(struct snd_pcm *pcm,
 295                 int stream)
 296 {
 297         struct snd_pcm_substream *substream = pcm->streams[stream].substream;
 298         struct snd_dma_buffer *buf = &substream->dma_buffer;
 299         size_t size = kirkwood_dma_snd_hw.buffer_bytes_max;
 300
 301         buf->dev.type = SNDRV_DMA_TYPE_DEV;
 302         buf->dev.dev = pcm->card->dev;
 303         buf->area = dma_alloc_coherent(pcm->card->dev, size,
 304                         &buf->addr, GFP_KERNEL);
 305         if (!buf->area)
 306                 return -ENOMEM;
 307         buf->bytes = size;
 308         buf->private_data = NULL;
 309
 310         return 0;
 311 }
 312
 313 static int kirkwood_dma_new(struct snd_card *card,
 314                 struct snd_soc_dai *dai, struct snd_pcm *pcm)
 315 {
 316         int ret;
 317
 318         if (!card->dev->dma_mask)
 319                 card->dev->dma_mask = &kirkwood_dma_dmamask;
 320         if (!card->dev->coherent_dma_mask)
 321                 card->dev->coherent_dma_mask = 0xffffffff;
 322
 323         if (dai->playback.channels_min) {
 324                 ret = kirkwood_dma_preallocate_dma_buffer(pcm,
 325                                 SNDRV_PCM_STREAM_PLAYBACK);
 326                 if (ret)
 327                         return ret;
 328         }
 329
 330         if (dai->capture.channels_min) {
 331                 ret = kirkwood_dma_preallocate_dma_buffer(pcm,
 332                                 SNDRV_PCM_STREAM_CAPTURE);
 333                 if (ret)
 334                         return ret;
 335         }
 336
 337         return 0;
 338 }
 339
 340 static void kirkwood_dma_free_dma_buffers(struct snd_pcm *pcm)
 341 {
 342         struct snd_pcm_substream *substream;
 343         struct snd_dma_buffer *buf;
 344         int stream;
 345
 346         for (stream = 0; stream < 2; stream++) {
 347                 substream = pcm->streams[stream].substream;
 348                 if (!substream)
 349                         continue;
 350                 buf = &substream->dma_buffer;
 351                 if (!buf->area)
 352                         continue;
 353
 354                 dma_free_coherent(pcm->card->dev, buf->bytes,
 355                                 buf->area, buf->addr);
 356                 buf->area = NULL;
 357         }
 358 }
 359
 360 struct snd_soc_platform kirkwood_soc_platform = {
 361         .name           = "kirkwood-dma",
 362         .pcm_ops        = &kirkwood_dma_ops,
 363         .pcm_new        = kirkwood_dma_new,
 364         .pcm_free       = kirkwood_dma_free_dma_buffers,
 365 };
 366 EXPORT_SYMBOL_GPL(kirkwood_soc_platform);
 367
 368 static int __init kirkwood_soc_platform_init(void)
 369 {
 370         return snd_soc_register_platform(&kirkwood_soc_platform);
 371 }
 372 module_init(kirkwood_soc_platform_init);
 373
 374 static void __exit kirkwood_soc_platform_exit(void)
 375 {
 376         snd_soc_unregister_platform(&kirkwood_soc_platform);
 377 }
 378 module_exit(kirkwood_soc_platform_exit);
 379
 380 MODULE_AUTHOR("Arnaud Patard <apatard@mandriva.com>");
 381 MODULE_DESCRIPTION("Marvell Kirkwood Audio DMA module");
 382 MODULE_LICENSE("GPL");
 383