kernel/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         .buffer_bytes_max       = 4*1024,
  36         .period_bytes_min       = 1*1024,
  37         .period_bytes_max       = 4*1024,
  38         .periods_min            = 1,
  39         .periods_max            = 1024,
  40 };
  41
  42 static int nuc900_dma_hw_params(struct snd_pcm_substream *substream,
  43         struct snd_pcm_hw_params *params)
  44 {
  45         return snd_pcm_lib_malloc_pages(substream, params_buffer_bytes(params));
  46 }
  47
  48 static void nuc900_update_dma_register(struct snd_pcm_substream *substream)
  49 {
  50         struct snd_pcm_runtime *runtime = substream->runtime;
  51         struct nuc900_audio *nuc900_audio = runtime->private_data;
  52         void __iomem *mmio_addr, *mmio_len;
  53
  54         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
  55                 mmio_addr = nuc900_audio->mmio + ACTL_PDSTB;
  56                 mmio_len = nuc900_audio->mmio + ACTL_PDST_LENGTH;
  57         } else {
  58                 mmio_addr = nuc900_audio->mmio + ACTL_RDSTB;
  59                 mmio_len = nuc900_audio->mmio + ACTL_RDST_LENGTH;
  60         }
  61
  62         AUDIO_WRITE(mmio_addr, runtime->dma_addr);
  63         AUDIO_WRITE(mmio_len, runtime->dma_bytes);
  64 }
  65
  66 static void nuc900_dma_start(struct snd_pcm_substream *substream)
  67 {
  68         struct snd_pcm_runtime *runtime = substream->runtime;
  69         struct nuc900_audio *nuc900_audio = runtime->private_data;
  70         unsigned long val;
  71
  72         val = AUDIO_READ(nuc900_audio->mmio + ACTL_CON);
  73         val |= (T_DMA_IRQ | R_DMA_IRQ);
  74         AUDIO_WRITE(nuc900_audio->mmio + ACTL_CON, val);
  75 }
  76
  77 static void nuc900_dma_stop(struct snd_pcm_substream *substream)
  78 {
  79         struct snd_pcm_runtime *runtime = substream->runtime;
  80         struct nuc900_audio *nuc900_audio = runtime->private_data;
  81         unsigned long val;
  82
  83         val = AUDIO_READ(nuc900_audio->mmio + ACTL_CON);
  84         val &= ~(T_DMA_IRQ | R_DMA_IRQ);
  85         AUDIO_WRITE(nuc900_audio->mmio + ACTL_CON, val);
  86 }
  87
  88 static irqreturn_t nuc900_dma_interrupt(int irq, void *dev_id)
  89 {
  90         struct snd_pcm_substream *substream = dev_id;
  91         struct nuc900_audio *nuc900_audio = substream->runtime->private_data;
  92         unsigned long val;
  93
  94         spin_lock(&nuc900_audio->lock);
  95
  96         val = AUDIO_READ(nuc900_audio->mmio + ACTL_CON);
  97
  98         if (val & R_DMA_IRQ) {
  99                 AUDIO_WRITE(nuc900_audio->mmio + ACTL_CON, val | R_DMA_IRQ);
 100
 101                 val = AUDIO_READ(nuc900_audio->mmio + ACTL_RSR);
 102
 103                 if (val & R_DMA_MIDDLE_IRQ) {
 104                         val |= R_DMA_MIDDLE_IRQ;
 105                         AUDIO_WRITE(nuc900_audio->mmio + ACTL_RSR, val);
 106                 }
 107
 108                 if (val & R_DMA_END_IRQ) {
 109                         val |= R_DMA_END_IRQ;
 110                         AUDIO_WRITE(nuc900_audio->mmio + ACTL_RSR, val);
 111                 }
 112         } else if (val & T_DMA_IRQ) {
 113                 AUDIO_WRITE(nuc900_audio->mmio + ACTL_CON, val | T_DMA_IRQ);
 114
 115                 val = AUDIO_READ(nuc900_audio->mmio + ACTL_PSR);
 116
 117                 if (val & P_DMA_MIDDLE_IRQ) {
 118                         val |= P_DMA_MIDDLE_IRQ;
 119                         AUDIO_WRITE(nuc900_audio->mmio + ACTL_PSR, val);
 120                 }
 121
 122                 if (val & P_DMA_END_IRQ) {
 123                         val |= P_DMA_END_IRQ;
 124                         AUDIO_WRITE(nuc900_audio->mmio + ACTL_PSR, val);
 125                 }
 126         } else {
 127                 dev_err(nuc900_audio->dev, "Wrong DMA interrupt status!\n");
 128                 spin_unlock(&nuc900_audio->lock);
 129                 return IRQ_HANDLED;
 130         }
 131
 132         spin_unlock(&nuc900_audio->lock);
 133
 134         snd_pcm_period_elapsed(substream);
 135
 136         return IRQ_HANDLED;
 137 }
 138
 139 static int nuc900_dma_hw_free(struct snd_pcm_substream *substream)
 140 {
 141         snd_pcm_lib_free_pages(substream);
 142         return 0;
 143 }
 144
 145 static int nuc900_dma_prepare(struct snd_pcm_substream *substream)
 146 {
 147         struct snd_pcm_runtime *runtime = substream->runtime;
 148         struct nuc900_audio *nuc900_audio = runtime->private_data;
 149         unsigned long flags, val;
 150         int ret = 0;
 151
 152         spin_lock_irqsave(&nuc900_audio->lock, flags);
 153
 154         nuc900_update_dma_register(substream);
 155
 156         val = AUDIO_READ(nuc900_audio->mmio + ACTL_RESET);
 157
 158         switch (runtime->channels) {
 159         case 1:
 160                 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
 161                         val &= ~(PLAY_LEFT_CHNNEL | PLAY_RIGHT_CHNNEL);
 162                         val |= PLAY_RIGHT_CHNNEL;
 163                 } else {
 164                         val &= ~(RECORD_LEFT_CHNNEL | RECORD_RIGHT_CHNNEL);
 165                         val |= RECORD_RIGHT_CHNNEL;
 166                 }
 167                 AUDIO_WRITE(nuc900_audio->mmio + ACTL_RESET, val);
 168                 break;
 169         case 2:
 170                 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
 171                         val |= (PLAY_LEFT_CHNNEL | PLAY_RIGHT_CHNNEL);
 172                 else
 173                         val |= (RECORD_LEFT_CHNNEL | RECORD_RIGHT_CHNNEL);
 174                 AUDIO_WRITE(nuc900_audio->mmio + ACTL_RESET, val);
 175                 break;
 176         default:
 177                 ret = -EINVAL;
 178         }
 179         spin_unlock_irqrestore(&nuc900_audio->lock, flags);
 180         return ret;
 181 }
 182
 183 static int nuc900_dma_trigger(struct snd_pcm_substream *substream, int cmd)
 184 {
 185         int ret = 0;
 186
 187         switch (cmd) {
 188         case SNDRV_PCM_TRIGGER_START:
 189         case SNDRV_PCM_TRIGGER_RESUME:
 190                 nuc900_dma_start(substream);
 191                 break;
 192
 193         case SNDRV_PCM_TRIGGER_STOP:
 194         case SNDRV_PCM_TRIGGER_SUSPEND:
 195                 nuc900_dma_stop(substream);
 196                 break;
 197
 198         default:
 199                 ret = -EINVAL;
 200                 break;
 201         }
 202
 203         return ret;
 204 }
 205
 206 static int nuc900_dma_getposition(struct snd_pcm_substream *substream,
 207                                         dma_addr_t *src, dma_addr_t *dst)
 208 {
 209         struct snd_pcm_runtime *runtime = substream->runtime;
 210         struct nuc900_audio *nuc900_audio = runtime->private_data;
 211
 212         if (src != NULL)
 213                 *src = AUDIO_READ(nuc900_audio->mmio + ACTL_PDSTC);
 214
 215         if (dst != NULL)
 216                 *dst = AUDIO_READ(nuc900_audio->mmio + ACTL_RDSTC);
 217
 218         return 0;
 219 }
 220
 221 static snd_pcm_uframes_t nuc900_dma_pointer(struct snd_pcm_substream *substream)
 222 {
 223         struct snd_pcm_runtime *runtime = substream->runtime;
 224         dma_addr_t src, dst;
 225         unsigned long res;
 226
 227         nuc900_dma_getposition(substream, &src, &dst);
 228
 229         if (substream->stream == SNDRV_PCM_STREAM_CAPTURE)
 230                 res = dst - runtime->dma_addr;
 231         else
 232                 res = src - runtime->dma_addr;
 233
 234         return bytes_to_frames(substream->runtime, res);
 235 }
 236
 237 static int nuc900_dma_open(struct snd_pcm_substream *substream)
 238 {
 239         struct snd_pcm_runtime *runtime = substream->runtime;
 240         struct nuc900_audio *nuc900_audio;
 241
 242         snd_soc_set_runtime_hwparams(substream, &nuc900_pcm_hardware);
 243
 244         nuc900_audio = nuc900_ac97_data;
 245
 246         if (request_irq(nuc900_audio->irq_num, nuc900_dma_interrupt,
 247                         0, "nuc900-dma", substream))
 248                 return -EBUSY;
 249
 250         runtime->private_data = nuc900_audio;
 251
 252         return 0;
 253 }
 254
 255 static int nuc900_dma_close(struct snd_pcm_substream *substream)
 256 {
 257         struct snd_pcm_runtime *runtime = substream->runtime;
 258         struct nuc900_audio *nuc900_audio = runtime->private_data;
 259
 260         free_irq(nuc900_audio->irq_num, substream);
 261
 262         return 0;
 263 }
 264
 265 static int nuc900_dma_mmap(struct snd_pcm_substream *substream,
 266         struct vm_area_struct *vma)
 267 {
 268         struct snd_pcm_runtime *runtime = substream->runtime;
 269
 270         return dma_mmap_writecombine(substream->pcm->card->dev, vma,
 271                                         runtime->dma_area,
 272                                         runtime->dma_addr,
 273                                         runtime->dma_bytes);
 274 }
 275
 276 static struct snd_pcm_ops nuc900_dma_ops = {
 277         .open           = nuc900_dma_open,
 278         .close          = nuc900_dma_close,
 279         .ioctl          = snd_pcm_lib_ioctl,
 280         .hw_params      = nuc900_dma_hw_params,
 281         .hw_free        = nuc900_dma_hw_free,
 282         .prepare        = nuc900_dma_prepare,
 283         .trigger        = nuc900_dma_trigger,
 284         .pointer        = nuc900_dma_pointer,
 285         .mmap           = nuc900_dma_mmap,
 286 };
 287
 288 static int nuc900_dma_new(struct snd_soc_pcm_runtime *rtd)
 289 {
 290         struct snd_card *card = rtd->card->snd_card;
 291         struct snd_pcm *pcm = rtd->pcm;
 292         int ret;
 293
 294         ret = dma_coerce_mask_and_coherent(card->dev, DMA_BIT_MASK(32));
 295         if (ret)
 296                 return ret;
 297
 298         snd_pcm_lib_preallocate_pages_for_all(pcm, SNDRV_DMA_TYPE_DEV,
 299                 card->dev, 4 * 1024, (4 * 1024) - 1);
 300
 301         return 0;
 302 }
 303
 304 static struct snd_soc_platform_driver nuc900_soc_platform = {
 305         .ops            = &nuc900_dma_ops,
 306         .pcm_new        = nuc900_dma_new,
 307 };
 308
 309 static int nuc900_soc_platform_probe(struct platform_device *pdev)
 310 {
 311         return snd_soc_register_platform(&pdev->dev, &nuc900_soc_platform);
 312 }
 313
 314 static int nuc900_soc_platform_remove(struct platform_device *pdev)
 315 {
 316         snd_soc_unregister_platform(&pdev->dev);
 317         return 0;
 318 }
 319
 320 static struct platform_driver nuc900_pcm_driver = {
 321         .driver = {
 322                         .name = "nuc900-pcm-audio",
 323         },
 324
 325         .probe = nuc900_soc_platform_probe,
 326         .remove = nuc900_soc_platform_remove,
 327 };
 328
 329 module_platform_driver(nuc900_pcm_driver);
 330
 331 MODULE_AUTHOR("Wan ZongShun, <mcuos.com@gmail.com>");
 332 MODULE_DESCRIPTION("nuc900 Audio DMA module");
 333 MODULE_LICENSE("GPL");