sound/soc/nuc900/nuc900-pcm.c

   1 /*
   2  * Copyright (c) 2010 Nuvoton technology corporation.
   3  *
   4  * Wan ZongShun <mcuos.com@gmail.com>
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License as published by
   8  * the Free Software Foundation;version 2 of the License.
   9  *
  10  */
  11
  12 #include <linux/module.h>
  13 #include <linux/init.h>
  14 #include <linux/io.h>
  15 #include <linux/platform_device.h>
  16 #include <linux/slab.h>
  17 #include <linux/dma-mapping.h>
  18
  19 #include <sound/core.h>
  20 #include <sound/pcm.h>
  21 #include <sound/pcm_params.h>
  22 #include <sound/soc.h>
  23
  24 #include <mach/hardware.h>
  25
  26 #include "nuc900-audio.h"
  27
  28 static const struct snd_pcm_hardware nuc900_pcm_hardware = {
  29         .info                   = SNDRV_PCM_INFO_INTERLEAVED |
  30                                         SNDRV_PCM_INFO_BLOCK_TRANSFER |
  31                                         SNDRV_PCM_INFO_MMAP |
  32                                         SNDRV_PCM_INFO_MMAP_VALID |
  33                                         SNDRV_PCM_INFO_PAUSE |
  34                                         SNDRV_PCM_INFO_RESUME,
  35         .formats                = SNDRV_PCM_FMTBIT_S16_LE,
  36         .channels_min           = 1,
  37         .channels_max           = 2,
  38         .buffer_bytes_max       = 4*1024,
  39         .period_bytes_min       = 1*1024,
  40         .period_bytes_max       = 4*1024,
  41         .periods_min            = 1,
  42         .periods_max            = 1024,
  43 };
  44
  45 static int nuc900_dma_hw_params(struct snd_pcm_substream *substream,
  46         struct snd_pcm_hw_params *params)
  47 {
  48         struct snd_pcm_runtime *runtime = substream->runtime;
  49         struct nuc900_audio *nuc900_audio = runtime->private_data;
  50         unsigned long flags;
  51         int ret = 0;
  52
  53         spin_lock_irqsave(&nuc900_audio->lock, flags);
  54
  55         ret = snd_pcm_lib_malloc_pages(substream, params_buffer_bytes(params));
  56         if (ret < 0)
  57                 return ret;
  58
  59         nuc900_audio->substream = substream;
  60         nuc900_audio->dma_addr[substream->stream] = runtime->dma_addr;
  61         nuc900_audio->buffersize[substream->stream] =
  62                                                 params_buffer_bytes(params);
  63
  64         spin_unlock_irqrestore(&nuc900_audio->lock, flags);
  65
  66         return ret;
  67 }
  68
  69 static void nuc900_update_dma_register(struct snd_pcm_substream *substream,
  70                                 dma_addr_t dma_addr, size_t count)
  71 {
  72         struct snd_pcm_runtime *runtime = substream->runtime;
  73         struct nuc900_audio *nuc900_audio = runtime->private_data;
  74         void __iomem *mmio_addr, *mmio_len;
  75
  76         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
  77                 mmio_addr = nuc900_audio->mmio + ACTL_PDSTB;
  78                 mmio_len = nuc900_audio->mmio + ACTL_PDST_LENGTH;
  79         } else {
  80                 mmio_addr = nuc900_audio->mmio + ACTL_RDSTB;
  81                 mmio_len = nuc900_audio->mmio + ACTL_RDST_LENGTH;
  82         }
  83
  84         AUDIO_WRITE(mmio_addr, dma_addr);
  85         AUDIO_WRITE(mmio_len, count);
  86 }
  87
  88 static void nuc900_dma_start(struct snd_pcm_substream *substream)
  89 {
  90         struct snd_pcm_runtime *runtime = substream->runtime;
  91         struct nuc900_audio *nuc900_audio = runtime->private_data;
  92         unsigned long val;
  93
  94         val = AUDIO_READ(nuc900_audio->mmio + ACTL_CON);
  95         val |= (T_DMA_IRQ | R_DMA_IRQ);
  96         AUDIO_WRITE(nuc900_audio->mmio + ACTL_CON, val);
  97 }
  98
  99 static void nuc900_dma_stop(struct snd_pcm_substream *substream)
 100 {
 101         struct snd_pcm_runtime *runtime = substream->runtime;
 102         struct nuc900_audio *nuc900_audio = runtime->private_data;
 103         unsigned long val;
 104
 105         val = AUDIO_READ(nuc900_audio->mmio + ACTL_CON);
 106         val &= ~(T_DMA_IRQ | R_DMA_IRQ);
 107         AUDIO_WRITE(nuc900_audio->mmio + ACTL_CON, val);
 108 }
 109
 110 static irqreturn_t nuc900_dma_interrupt(int irq, void *dev_id)
 111 {
 112         struct snd_pcm_substream *substream = dev_id;
 113         struct nuc900_audio *nuc900_audio = substream->runtime->private_data;
 114         unsigned long val;
 115
 116         spin_lock(&nuc900_audio->lock);
 117
 118         val = AUDIO_READ(nuc900_audio->mmio + ACTL_CON);
 119
 120         if (val & R_DMA_IRQ) {
 121                 AUDIO_WRITE(nuc900_audio->mmio + ACTL_CON, val | R_DMA_IRQ);
 122
 123                 val = AUDIO_READ(nuc900_audio->mmio + ACTL_RSR);
 124
 125                 if (val & R_DMA_MIDDLE_IRQ) {
 126                         val |= R_DMA_MIDDLE_IRQ;
 127                         AUDIO_WRITE(nuc900_audio->mmio + ACTL_RSR, val);
 128                 }
 129
 130                 if (val & R_DMA_END_IRQ) {
 131                         val |= R_DMA_END_IRQ;
 132                         AUDIO_WRITE(nuc900_audio->mmio + ACTL_RSR, val);
 133                 }
 134         } else if (val & T_DMA_IRQ) {
 135                 AUDIO_WRITE(nuc900_audio->mmio + ACTL_CON, val | T_DMA_IRQ);
 136
 137                 val = AUDIO_READ(nuc900_audio->mmio + ACTL_PSR);
 138
 139                 if (val & P_DMA_MIDDLE_IRQ) {
 140                         val |= P_DMA_MIDDLE_IRQ;
 141                         AUDIO_WRITE(nuc900_audio->mmio + ACTL_PSR, val);
 142                 }
 143
 144                 if (val & P_DMA_END_IRQ) {
 145                         val |= P_DMA_END_IRQ;
 146                         AUDIO_WRITE(nuc900_audio->mmio + ACTL_PSR, val);
 147                 }
 148         } else {
 149                 dev_err(nuc900_audio->dev, "Wrong DMA interrupt status!\n");
 150                 spin_unlock(&nuc900_audio->lock);
 151                 return IRQ_HANDLED;
 152         }
 153
 154         spin_unlock(&nuc900_audio->lock);
 155
 156         snd_pcm_period_elapsed(substream);
 157
 158         return IRQ_HANDLED;
 159 }
 160
 161 static int nuc900_dma_hw_free(struct snd_pcm_substream *substream)
 162 {
 163         snd_pcm_lib_free_pages(substream);
 164         return 0;
 165 }
 166
 167 static int nuc900_dma_prepare(struct snd_pcm_substream *substream)
 168 {
 169         struct snd_pcm_runtime *runtime = substream->runtime;
 170         struct nuc900_audio *nuc900_audio = runtime->private_data;
 171         unsigned long flags, val;
 172
 173         spin_lock_irqsave(&nuc900_audio->lock, flags);
 174
 175         nuc900_update_dma_register(substream,
 176                                 nuc900_audio->dma_addr[substream->stream],
 177                                 nuc900_audio->buffersize[substream->stream]);
 178
 179         val = AUDIO_READ(nuc900_audio->mmio + ACTL_RESET);
 180
 181         switch (runtime->channels) {
 182         case 1:
 183                 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
 184                         val &= ~(PLAY_LEFT_CHNNEL | PLAY_RIGHT_CHNNEL);
 185                         val |= PLAY_RIGHT_CHNNEL;
 186                 } else {
 187                         val &= ~(RECORD_LEFT_CHNNEL | RECORD_RIGHT_CHNNEL);
 188                         val |= RECORD_RIGHT_CHNNEL;
 189                 }
 190                 AUDIO_WRITE(nuc900_audio->mmio + ACTL_RESET, val);
 191                 break;
 192         case 2:
 193                 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
 194                         val |= (PLAY_LEFT_CHNNEL | PLAY_RIGHT_CHNNEL);
 195                 else
 196                         val |= (RECORD_LEFT_CHNNEL | RECORD_RIGHT_CHNNEL);
 197                 AUDIO_WRITE(nuc900_audio->mmio + ACTL_RESET, val);
 198                 break;
 199         default:
 200                 return -EINVAL;
 201         }
 202         spin_unlock_irqrestore(&nuc900_audio->lock, flags);
 203         return 0;
 204 }
 205
 206 static int nuc900_dma_trigger(struct snd_pcm_substream *substream, int cmd)
 207 {
 208         int ret = 0;
 209
 210         switch (cmd) {
 211         case SNDRV_PCM_TRIGGER_START:
 212         case SNDRV_PCM_TRIGGER_RESUME:
 213                 nuc900_dma_start(substream);
 214                 break;
 215
 216         case SNDRV_PCM_TRIGGER_STOP:
 217         case SNDRV_PCM_TRIGGER_SUSPEND:
 218                 nuc900_dma_stop(substream);
 219                 break;
 220
 221         default:
 222                 ret = -EINVAL;
 223                 break;
 224         }
 225
 226         return ret;
 227 }
 228
 229 int nuc900_dma_getposition(struct snd_pcm_substream *substream,
 230                                         dma_addr_t *src, dma_addr_t *dst)
 231 {
 232         struct snd_pcm_runtime *runtime = substream->runtime;
 233         struct nuc900_audio *nuc900_audio = runtime->private_data;
 234
 235         if (src != NULL)
 236                 *src = AUDIO_READ(nuc900_audio->mmio + ACTL_PDSTC);
 237
 238         if (dst != NULL)
 239                 *dst = AUDIO_READ(nuc900_audio->mmio + ACTL_RDSTC);
 240
 241         return 0;
 242 }
 243
 244 static snd_pcm_uframes_t nuc900_dma_pointer(struct snd_pcm_substream *substream)
 245 {
 246         struct snd_pcm_runtime *runtime = substream->runtime;
 247         dma_addr_t src, dst;
 248         unsigned long res;
 249
 250         nuc900_dma_getposition(substream, &src, &dst);
 251
 252         if (substream->stream == SNDRV_PCM_STREAM_CAPTURE)
 253                 res = dst - runtime->dma_addr;
 254         else
 255                 res = src - runtime->dma_addr;
 256
 257         return bytes_to_frames(substream->runtime, res);
 258 }
 259
 260 static int nuc900_dma_open(struct snd_pcm_substream *substream)
 261 {
 262         struct snd_pcm_runtime *runtime = substream->runtime;
 263         struct nuc900_audio *nuc900_audio;
 264
 265         snd_soc_set_runtime_hwparams(substream, &nuc900_pcm_hardware);
 266
 267         nuc900_audio = nuc900_ac97_data;
 268
 269         if (request_irq(nuc900_audio->irq_num, nuc900_dma_interrupt,
 270                         IRQF_DISABLED, "nuc900-dma", substream))
 271                 return -EBUSY;
 272
 273         runtime->private_data = nuc900_audio;
 274
 275         return 0;
 276 }
 277
 278 static int nuc900_dma_close(struct snd_pcm_substream *substream)
 279 {
 280         struct snd_pcm_runtime *runtime = substream->runtime;
 281         struct nuc900_audio *nuc900_audio = runtime->private_data;
 282
 283         free_irq(nuc900_audio->irq_num, substream);
 284
 285         return 0;
 286 }
 287
 288 static int nuc900_dma_mmap(struct snd_pcm_substream *substream,
 289         struct vm_area_struct *vma)
 290 {
 291         struct snd_pcm_runtime *runtime = substream->runtime;
 292
 293         return dma_mmap_writecombine(substream->pcm->card->dev, vma,
 294                                         runtime->dma_area,
 295                                         runtime->dma_addr,
 296                                         runtime->dma_bytes);
 297 }
 298
 299 static struct snd_pcm_ops nuc900_dma_ops = {
 300         .open           = nuc900_dma_open,
 301         .close          = nuc900_dma_close,
 302         .ioctl          = snd_pcm_lib_ioctl,
 303         .hw_params      = nuc900_dma_hw_params,
 304         .hw_free        = nuc900_dma_hw_free,
 305         .prepare        = nuc900_dma_prepare,
 306         .trigger        = nuc900_dma_trigger,
 307         .pointer        = nuc900_dma_pointer,
 308         .mmap           = nuc900_dma_mmap,
 309 };
 310
 311 static void nuc900_dma_free_dma_buffers(struct snd_pcm *pcm)
 312 {
 313         snd_pcm_lib_preallocate_free_for_all(pcm);
 314 }
 315
 316 static u64 nuc900_pcm_dmamask = DMA_BIT_MASK(32);
 317 static int nuc900_dma_new(struct snd_card *card,
 318         struct snd_soc_dai *dai, struct snd_pcm *pcm)
 319 {
 320         if (!card->dev->dma_mask)
 321                 card->dev->dma_mask = &nuc900_pcm_dmamask;
 322         if (!card->dev->coherent_dma_mask)
 323                 card->dev->coherent_dma_mask = DMA_BIT_MASK(32);
 324
 325         snd_pcm_lib_preallocate_pages_for_all(pcm, SNDRV_DMA_TYPE_DEV,
 326                 card->dev, 4 * 1024, (4 * 1024) - 1);
 327
 328         return 0;
 329 }
 330
 331 struct snd_soc_platform nuc900_soc_platform = {
 332         .name           = "nuc900-dma",
 333         .pcm_ops        = &nuc900_dma_ops,
 334         .pcm_new        = nuc900_dma_new,
 335         .pcm_free       = nuc900_dma_free_dma_buffers,
 336 }
 337 EXPORT_SYMBOL_GPL(nuc900_soc_platform);
 338
 339 static int __init nuc900_soc_platform_init(void)
 340 {
 341         return snd_soc_register_platform(&nuc900_soc_platform);
 342 }
 343
 344 static void __exit nuc900_soc_platform_exit(void)
 345 {
 346         snd_soc_unregister_platform(&nuc900_soc_platform);
 347 }
 348
 349 module_init(nuc900_soc_platform_init);
 350 module_exit(nuc900_soc_platform_exit);
 351
 352 MODULE_AUTHOR("Wan ZongShun, <mcuos.com@gmail.com>");
 353 MODULE_DESCRIPTION("nuc900 Audio DMA module");
 354 MODULE_LICENSE("GPL");