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-auido.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, stype = SUBSTREAM_TYPE(substream);
  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[stype] = runtime->dma_addr;
  61         nuc900_audio->buffersize[stype] = params_buffer_bytes(params);
  62
  63         spin_unlock_irqrestore(&nuc900_audio->lock, flags);
  64
  65         return ret;
  66 }
  67
  68 static void nuc900_update_dma_register(struct snd_pcm_substream *substream,
  69                                 dma_addr_t dma_addr, size_t count)
  70 {
  71         struct snd_pcm_runtime *runtime = substream->runtime;
  72         struct nuc900_audio *nuc900_audio = runtime->private_data;
  73         void __iomem *mmio_addr, *mmio_len;
  74
  75         if (SUBSTREAM_TYPE(substream) == PCM_TX) {
  76                 mmio_addr = nuc900_audio->mmio + ACTL_PDSTB;
  77                 mmio_len = nuc900_audio->mmio + ACTL_PDST_LENGTH;
  78         } else {
  79                 mmio_addr = nuc900_audio->mmio + ACTL_RDSTB;
  80                 mmio_len = nuc900_audio->mmio + ACTL_RDST_LENGTH;
  81         }
  82
  83         AUDIO_WRITE(mmio_addr, dma_addr);
  84         AUDIO_WRITE(mmio_len, count);
  85 }
  86
  87 static void nuc900_dma_start(struct snd_pcm_substream *substream)
  88 {
  89         struct snd_pcm_runtime *runtime = substream->runtime;
  90         struct nuc900_audio *nuc900_audio = runtime->private_data;
  91         unsigned long val;
  92
  93         val = AUDIO_READ(nuc900_audio->mmio + ACTL_CON);
  94         val |= (T_DMA_IRQ | R_DMA_IRQ);
  95         AUDIO_WRITE(nuc900_audio->mmio + ACTL_CON, val);
  96 }
  97
  98 static void nuc900_dma_stop(struct snd_pcm_substream *substream)
  99 {
 100         struct snd_pcm_runtime *runtime = substream->runtime;
 101         struct nuc900_audio *nuc900_audio = runtime->private_data;
 102         unsigned long val;
 103
 104         val = AUDIO_READ(nuc900_audio->mmio + ACTL_CON);
 105         val &= ~(T_DMA_IRQ | R_DMA_IRQ);
 106         AUDIO_WRITE(nuc900_audio->mmio + ACTL_CON, val);
 107 }
 108
 109 static irqreturn_t nuc900_dma_interrupt(int irq, void *dev_id)
 110 {
 111         struct snd_pcm_substream *substream = dev_id;
 112         struct nuc900_audio *nuc900_audio = substream->runtime->private_data;
 113         unsigned long val;
 114
 115         spin_lock(&nuc900_audio->lock);
 116
 117         val = AUDIO_READ(nuc900_audio->mmio + ACTL_CON);
 118
 119         if (val & R_DMA_IRQ) {
 120                 AUDIO_WRITE(nuc900_audio->mmio + ACTL_CON, val | R_DMA_IRQ);
 121
 122                 val = AUDIO_READ(nuc900_audio->mmio + ACTL_RSR);
 123
 124                 if (val & R_DMA_MIDDLE_IRQ) {
 125                         val |= R_DMA_MIDDLE_IRQ;
 126                         AUDIO_WRITE(nuc900_audio->mmio + ACTL_RSR, val);
 127                 }
 128
 129                 if (val & R_DMA_END_IRQ) {
 130                         val |= R_DMA_END_IRQ;
 131                         AUDIO_WRITE(nuc900_audio->mmio + ACTL_RSR, val);
 132                 }
 133         } else if (val & T_DMA_IRQ) {
 134                 AUDIO_WRITE(nuc900_audio->mmio + ACTL_CON, val | T_DMA_IRQ);
 135
 136                 val = AUDIO_READ(nuc900_audio->mmio + ACTL_PSR);
 137
 138                 if (val & P_DMA_MIDDLE_IRQ) {
 139                         val |= P_DMA_MIDDLE_IRQ;
 140                         AUDIO_WRITE(nuc900_audio->mmio + ACTL_PSR, val);
 141                 }
 142
 143                 if (val & P_DMA_END_IRQ) {
 144                         val |= P_DMA_END_IRQ;
 145                         AUDIO_WRITE(nuc900_audio->mmio + ACTL_PSR, val);
 146                 }
 147         } else {
 148                 dev_err(nuc900_audio->dev, "Wrong DMA interrupt status!\n");
 149                 spin_unlock(&nuc900_audio->lock);
 150                 return IRQ_HANDLED;
 151         }
 152
 153         spin_unlock(&nuc900_audio->lock);
 154
 155         snd_pcm_period_elapsed(substream);
 156
 157         return IRQ_HANDLED;
 158 }
 159
 160 static int nuc900_dma_hw_free(struct snd_pcm_substream *substream)
 161 {
 162         snd_pcm_lib_free_pages(substream);
 163         return 0;
 164 }
 165
 166 static int nuc900_dma_prepare(struct snd_pcm_substream *substream)
 167 {
 168         struct snd_pcm_runtime *runtime = substream->runtime;
 169         struct nuc900_audio *nuc900_audio = runtime->private_data;
 170         unsigned long flags, val, stype = SUBSTREAM_TYPE(substream);;
 171
 172         spin_lock_irqsave(&nuc900_audio->lock, flags);
 173
 174         nuc900_update_dma_register(substream,
 175                 nuc900_audio->dma_addr[stype], nuc900_audio->buffersize[stype]);
 176
 177         val = AUDIO_READ(nuc900_audio->mmio + ACTL_RESET);
 178
 179         switch (runtime->channels) {
 180         case 1:
 181                 if (PCM_TX == stype) {
 182                         val &= ~(PLAY_LEFT_CHNNEL | PLAY_RIGHT_CHNNEL);
 183                         val |= PLAY_RIGHT_CHNNEL;
 184                 } else {
 185                         val &= ~(RECORD_LEFT_CHNNEL | RECORD_RIGHT_CHNNEL);
 186                         val |= RECORD_RIGHT_CHNNEL;
 187                 }
 188                 AUDIO_WRITE(nuc900_audio->mmio + ACTL_RESET, val);
 189                 break;
 190         case 2:
 191                 if (PCM_TX == stype)
 192                         val |= (PLAY_LEFT_CHNNEL | PLAY_RIGHT_CHNNEL);
 193                 else
 194                         val |= (RECORD_LEFT_CHNNEL | RECORD_RIGHT_CHNNEL);
 195                 AUDIO_WRITE(nuc900_audio->mmio + ACTL_RESET, val);
 196                 break;
 197         default:
 198                 return -EINVAL;
 199         }
 200         spin_unlock_irqrestore(&nuc900_audio->lock, flags);
 201         return 0;
 202 }
 203
 204 static int nuc900_dma_trigger(struct snd_pcm_substream *substream, int cmd)
 205 {
 206         int ret = 0;
 207
 208         switch (cmd) {
 209         case SNDRV_PCM_TRIGGER_START:
 210         case SNDRV_PCM_TRIGGER_RESUME:
 211                 nuc900_dma_start(substream);
 212                 break;
 213
 214         case SNDRV_PCM_TRIGGER_STOP:
 215         case SNDRV_PCM_TRIGGER_SUSPEND:
 216                 nuc900_dma_stop(substream);
 217                 break;
 218
 219         default:
 220                 ret = -EINVAL;
 221                 break;
 222         }
 223
 224         return ret;
 225 }
 226
 227 int nuc900_dma_getposition(struct snd_pcm_substream *substream,
 228                                         dma_addr_t *src, dma_addr_t *dst)
 229 {
 230         struct snd_pcm_runtime *runtime = substream->runtime;
 231         struct nuc900_audio *nuc900_audio = runtime->private_data;
 232
 233         if (src != NULL)
 234                 *src = AUDIO_READ(nuc900_audio->mmio + ACTL_PDSTC);
 235
 236         if (dst != NULL)
 237                 *dst = AUDIO_READ(nuc900_audio->mmio + ACTL_RDSTC);
 238
 239         return 0;
 240 }
 241
 242 static snd_pcm_uframes_t nuc900_dma_pointer(struct snd_pcm_substream *substream)
 243 {
 244         struct snd_pcm_runtime *runtime = substream->runtime;
 245         dma_addr_t src, dst;
 246         unsigned long res;
 247
 248         nuc900_dma_getposition(substream, &src, &dst);
 249
 250         if (substream->stream == SNDRV_PCM_STREAM_CAPTURE)
 251                 res = dst - runtime->dma_addr;
 252         else
 253                 res = src - runtime->dma_addr;
 254
 255         return bytes_to_frames(substream->runtime, res);
 256 }
 257
 258 static int nuc900_dma_open(struct snd_pcm_substream *substream)
 259 {
 260         struct snd_pcm_runtime *runtime = substream->runtime;
 261         struct nuc900_audio *nuc900_audio;
 262
 263         snd_soc_set_runtime_hwparams(substream, &nuc900_pcm_hardware);
 264
 265         nuc900_audio = nuc900_ac97_data;
 266
 267         if (request_irq(nuc900_audio->irq_num, nuc900_dma_interrupt,
 268                         IRQF_DISABLED, "nuc900-dma", substream))
 269                 return -EBUSY;
 270
 271         runtime->private_data = nuc900_audio;
 272
 273         return 0;
 274 }
 275
 276 static int nuc900_dma_close(struct snd_pcm_substream *substream)
 277 {
 278         struct snd_pcm_runtime *runtime = substream->runtime;
 279         struct nuc900_audio *nuc900_audio = runtime->private_data;
 280
 281         free_irq(nuc900_audio->irq_num, substream);
 282
 283         return 0;
 284 }
 285
 286 static int nuc900_dma_mmap(struct snd_pcm_substream *substream,
 287         struct vm_area_struct *vma)
 288 {
 289         struct snd_pcm_runtime *runtime = substream->runtime;
 290
 291         return dma_mmap_writecombine(substream->pcm->card->dev, vma,
 292                                         runtime->dma_area,
 293                                         runtime->dma_addr,
 294                                         runtime->dma_bytes);
 295 }
 296
 297 static struct snd_pcm_ops nuc900_dma_ops = {
 298         .open           = nuc900_dma_open,
 299         .close          = nuc900_dma_close,
 300         .ioctl          = snd_pcm_lib_ioctl,
 301         .hw_params      = nuc900_dma_hw_params,
 302         .hw_free        = nuc900_dma_hw_free,
 303         .prepare        = nuc900_dma_prepare,
 304         .trigger        = nuc900_dma_trigger,
 305         .pointer        = nuc900_dma_pointer,
 306         .mmap           = nuc900_dma_mmap,
 307 };
 308
 309 static void nuc900_dma_free_dma_buffers(struct snd_pcm *pcm)
 310 {
 311         snd_pcm_lib_preallocate_free_for_all(pcm);
 312 }
 313
 314 static u64 nuc900_pcm_dmamask = DMA_BIT_MASK(32);
 315 static int nuc900_dma_new(struct snd_card *card,
 316         struct snd_soc_dai *dai, struct snd_pcm *pcm)
 317 {
 318         if (!card->dev->dma_mask)
 319                 card->dev->dma_mask = &nuc900_pcm_dmamask;
 320         if (!card->dev->coherent_dma_mask)
 321                 card->dev->coherent_dma_mask = DMA_BIT_MASK(32);
 322
 323         snd_pcm_lib_preallocate_pages_for_all(pcm, SNDRV_DMA_TYPE_DEV,
 324                 card->dev, 4 * 1024, (4 * 1024) - 1);
 325
 326         return 0;
 327 }
 328
 329 struct snd_soc_platform nuc900_soc_platform = {
 330         .name           = "nuc900-dma",
 331         .pcm_ops        = &nuc900_dma_ops,
 332         .pcm_new        = nuc900_dma_new,
 333         .pcm_free       = nuc900_dma_free_dma_buffers,
 334 }
 335 EXPORT_SYMBOL_GPL(nuc900_soc_platform);
 336
 337 static int __init nuc900_soc_platform_init(void)
 338 {
 339         return snd_soc_register_platform(&nuc900_soc_platform);
 340 }
 341
 342 static void __exit nuc900_soc_platform_exit(void)
 343 {
 344         snd_soc_unregister_platform(&nuc900_soc_platform);
 345 }
 346
 347 module_init(nuc900_soc_platform_init);
 348 module_exit(nuc900_soc_platform_exit);
 349
 350 MODULE_AUTHOR("Wan ZongShun, <mcuos.com@gmail.com>");
 351 MODULE_DESCRIPTION("nuc900 Audio DMA module");
 352 MODULE_LICENSE("GPL");