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         ret = snd_pcm_lib_malloc_pages(substream, params_buffer_bytes(params));
  54         if (ret < 0)
  55                 return ret;
  56
  57         spin_lock_irqsave(&nuc900_audio->lock, flags);
  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         int ret = 0;
 173
 174         spin_lock_irqsave(&nuc900_audio->lock, flags);
 175
 176         nuc900_update_dma_register(substream,
 177                                 nuc900_audio->dma_addr[substream->stream],
 178                                 nuc900_audio->buffersize[substream->stream]);
 179
 180         val = AUDIO_READ(nuc900_audio->mmio + ACTL_RESET);
 181
 182         switch (runtime->channels) {
 183         case 1:
 184                 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
 185                         val &= ~(PLAY_LEFT_CHNNEL | PLAY_RIGHT_CHNNEL);
 186                         val |= PLAY_RIGHT_CHNNEL;
 187                 } else {
 188                         val &= ~(RECORD_LEFT_CHNNEL | RECORD_RIGHT_CHNNEL);
 189                         val |= RECORD_RIGHT_CHNNEL;
 190                 }
 191                 AUDIO_WRITE(nuc900_audio->mmio + ACTL_RESET, val);
 192                 break;
 193         case 2:
 194                 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
 195                         val |= (PLAY_LEFT_CHNNEL | PLAY_RIGHT_CHNNEL);
 196                 else
 197                         val |= (RECORD_LEFT_CHNNEL | RECORD_RIGHT_CHNNEL);
 198                 AUDIO_WRITE(nuc900_audio->mmio + ACTL_RESET, val);
 199                 break;
 200         default:
 201                 ret = -EINVAL;
 202         }
 203         spin_unlock_irqrestore(&nuc900_audio->lock, flags);
 204         return ret;
 205 }
 206
 207 static int nuc900_dma_trigger(struct snd_pcm_substream *substream, int cmd)
 208 {
 209         int ret = 0;
 210
 211         switch (cmd) {
 212         case SNDRV_PCM_TRIGGER_START:
 213         case SNDRV_PCM_TRIGGER_RESUME:
 214                 nuc900_dma_start(substream);
 215                 break;
 216
 217         case SNDRV_PCM_TRIGGER_STOP:
 218         case SNDRV_PCM_TRIGGER_SUSPEND:
 219                 nuc900_dma_stop(substream);
 220                 break;
 221
 222         default:
 223                 ret = -EINVAL;
 224                 break;
 225         }
 226
 227         return ret;
 228 }
 229
 230 static int nuc900_dma_getposition(struct snd_pcm_substream *substream,
 231                                         dma_addr_t *src, dma_addr_t *dst)
 232 {
 233         struct snd_pcm_runtime *runtime = substream->runtime;
 234         struct nuc900_audio *nuc900_audio = runtime->private_data;
 235
 236         if (src != NULL)
 237                 *src = AUDIO_READ(nuc900_audio->mmio + ACTL_PDSTC);
 238
 239         if (dst != NULL)
 240                 *dst = AUDIO_READ(nuc900_audio->mmio + ACTL_RDSTC);
 241
 242         return 0;
 243 }
 244
 245 static snd_pcm_uframes_t nuc900_dma_pointer(struct snd_pcm_substream *substream)
 246 {
 247         struct snd_pcm_runtime *runtime = substream->runtime;
 248         dma_addr_t src, dst;
 249         unsigned long res;
 250
 251         nuc900_dma_getposition(substream, &src, &dst);
 252
 253         if (substream->stream == SNDRV_PCM_STREAM_CAPTURE)
 254                 res = dst - runtime->dma_addr;
 255         else
 256                 res = src - runtime->dma_addr;
 257
 258         return bytes_to_frames(substream->runtime, res);
 259 }
 260
 261 static int nuc900_dma_open(struct snd_pcm_substream *substream)
 262 {
 263         struct snd_pcm_runtime *runtime = substream->runtime;
 264         struct nuc900_audio *nuc900_audio;
 265
 266         snd_soc_set_runtime_hwparams(substream, &nuc900_pcm_hardware);
 267
 268         nuc900_audio = nuc900_ac97_data;
 269
 270         if (request_irq(nuc900_audio->irq_num, nuc900_dma_interrupt,
 271                         0, "nuc900-dma", substream))
 272                 return -EBUSY;
 273
 274         runtime->private_data = nuc900_audio;
 275
 276         return 0;
 277 }
 278
 279 static int nuc900_dma_close(struct snd_pcm_substream *substream)
 280 {
 281         struct snd_pcm_runtime *runtime = substream->runtime;
 282         struct nuc900_audio *nuc900_audio = runtime->private_data;
 283
 284         free_irq(nuc900_audio->irq_num, substream);
 285
 286         return 0;
 287 }
 288
 289 static int nuc900_dma_mmap(struct snd_pcm_substream *substream,
 290         struct vm_area_struct *vma)
 291 {
 292         struct snd_pcm_runtime *runtime = substream->runtime;
 293
 294         return dma_mmap_writecombine(substream->pcm->card->dev, vma,
 295                                         runtime->dma_area,
 296                                         runtime->dma_addr,
 297                                         runtime->dma_bytes);
 298 }
 299
 300 static struct snd_pcm_ops nuc900_dma_ops = {
 301         .open           = nuc900_dma_open,
 302         .close          = nuc900_dma_close,
 303         .ioctl          = snd_pcm_lib_ioctl,
 304         .hw_params      = nuc900_dma_hw_params,
 305         .hw_free        = nuc900_dma_hw_free,
 306         .prepare        = nuc900_dma_prepare,
 307         .trigger        = nuc900_dma_trigger,
 308         .pointer        = nuc900_dma_pointer,
 309         .mmap           = nuc900_dma_mmap,
 310 };
 311
 312 static void nuc900_dma_free_dma_buffers(struct snd_pcm *pcm)
 313 {
 314         snd_pcm_lib_preallocate_free_for_all(pcm);
 315 }
 316
 317 static u64 nuc900_pcm_dmamask = DMA_BIT_MASK(32);
 318 static int nuc900_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
 323         if (!card->dev->dma_mask)
 324                 card->dev->dma_mask = &nuc900_pcm_dmamask;
 325         if (!card->dev->coherent_dma_mask)
 326                 card->dev->coherent_dma_mask = DMA_BIT_MASK(32);
 327
 328         snd_pcm_lib_preallocate_pages_for_all(pcm, SNDRV_DMA_TYPE_DEV,
 329                 card->dev, 4 * 1024, (4 * 1024) - 1);
 330
 331         return 0;
 332 }
 333
 334 static struct snd_soc_platform_driver nuc900_soc_platform = {
 335         .ops            = &nuc900_dma_ops,
 336         .pcm_new        = nuc900_dma_new,
 337         .pcm_free       = nuc900_dma_free_dma_buffers,
 338 };
 339
 340 static int nuc900_soc_platform_probe(struct platform_device *pdev)
 341 {
 342         return snd_soc_register_platform(&pdev->dev, &nuc900_soc_platform);
 343 }
 344
 345 static int nuc900_soc_platform_remove(struct platform_device *pdev)
 346 {
 347         snd_soc_unregister_platform(&pdev->dev);
 348         return 0;
 349 }
 350
 351 static struct platform_driver nuc900_pcm_driver = {
 352         .driver = {
 353                         .name = "nuc900-pcm-audio",
 354                         .owner = THIS_MODULE,
 355         },
 356
 357         .probe = nuc900_soc_platform_probe,
 358         .remove = nuc900_soc_platform_remove,
 359 };
 360
 361 module_platform_driver(nuc900_pcm_driver);
 362
 363 MODULE_AUTHOR("Wan ZongShun, <mcuos.com@gmail.com>");
 364 MODULE_DESCRIPTION("nuc900 Audio DMA module");
 365 MODULE_LICENSE("GPL");