sound/soc/txx9/txx9aclc.c

   1 /*
   2  * Generic TXx9 ACLC platform driver
   3  *
   4  * Copyright (C) 2009 Atsushi Nemoto
   5  *
   6  * Based on RBTX49xx patch from CELF patch archive.
   7  * (C) Copyright TOSHIBA CORPORATION 2004-2006
   8  *
   9  * This program is free software; you can redistribute it and/or modify
  10  * it under the terms of the GNU General Public License version 2 as
  11  * published by the Free Software Foundation.
  12  */
  13
  14 #include <linux/module.h>
  15 #include <linux/init.h>
  16 #include <linux/platform_device.h>
  17 #include <linux/scatterlist.h>
  18 #include <sound/core.h>
  19 #include <sound/pcm.h>
  20 #include <sound/pcm_params.h>
  21 #include <sound/soc.h>
  22 #include "txx9aclc.h"
  23
  24 static const struct snd_pcm_hardware txx9aclc_pcm_hardware = {
  25         /*
  26          * REVISIT: SNDRV_PCM_INFO_MMAP | SNDRV_PCM_INFO_MMAP_VALID
  27          * needs more works for noncoherent MIPS.
  28          */
  29         .info             = SNDRV_PCM_INFO_INTERLEAVED |
  30                             SNDRV_PCM_INFO_BATCH |
  31                             SNDRV_PCM_INFO_PAUSE,
  32 #ifdef __BIG_ENDIAN
  33         .formats          = SNDRV_PCM_FMTBIT_S16_BE,
  34 #else
  35         .formats          = SNDRV_PCM_FMTBIT_S16_LE,
  36 #endif
  37         .period_bytes_min = 1024,
  38         .period_bytes_max = 8 * 1024,
  39         .periods_min      = 2,
  40         .periods_max      = 4096,
  41         .buffer_bytes_max = 32 * 1024,
  42 };
  43
  44 static int txx9aclc_pcm_hw_params(struct snd_pcm_substream *substream,
  45                                   struct snd_pcm_hw_params *params)
  46 {
  47         struct snd_soc_pcm_runtime *rtd = snd_pcm_substream_chip(substream);
  48         struct snd_soc_device *socdev = rtd->socdev;
  49         struct snd_pcm_runtime *runtime = substream->runtime;
  50         struct txx9aclc_dmadata *dmadata = runtime->private_data;
  51         int ret;
  52
  53         ret = snd_pcm_lib_malloc_pages(substream, params_buffer_bytes(params));
  54         if (ret < 0)
  55                 return ret;
  56
  57         dev_dbg(socdev->dev,
  58                 "runtime->dma_area = %#lx dma_addr = %#lx dma_bytes = %zd "
  59                 "runtime->min_align %ld\n",
  60                 (unsigned long)runtime->dma_area,
  61                 (unsigned long)runtime->dma_addr, runtime->dma_bytes,
  62                 runtime->min_align);
  63         dev_dbg(socdev->dev,
  64                 "periods %d period_bytes %d stream %d\n",
  65                 params_periods(params), params_period_bytes(params),
  66                 substream->stream);
  67
  68         dmadata->substream = substream;
  69         dmadata->pos = 0;
  70         return 0;
  71 }
  72
  73 static int txx9aclc_pcm_hw_free(struct snd_pcm_substream *substream)
  74 {
  75         return snd_pcm_lib_free_pages(substream);
  76 }
  77
  78 static int txx9aclc_pcm_prepare(struct snd_pcm_substream *substream)
  79 {
  80         struct snd_pcm_runtime *runtime = substream->runtime;
  81         struct txx9aclc_dmadata *dmadata = runtime->private_data;
  82
  83         dmadata->dma_addr = runtime->dma_addr;
  84         dmadata->buffer_bytes = snd_pcm_lib_buffer_bytes(substream);
  85         dmadata->period_bytes = snd_pcm_lib_period_bytes(substream);
  86
  87         if (dmadata->buffer_bytes == dmadata->period_bytes) {
  88                 dmadata->frag_bytes = dmadata->period_bytes >> 1;
  89                 dmadata->frags = 2;
  90         } else {
  91                 dmadata->frag_bytes = dmadata->period_bytes;
  92                 dmadata->frags = dmadata->buffer_bytes / dmadata->period_bytes;
  93         }
  94         dmadata->frag_count = 0;
  95         dmadata->pos = 0;
  96         return 0;
  97 }
  98
  99 static void txx9aclc_dma_complete(void *arg)
 100 {
 101         struct txx9aclc_dmadata *dmadata = arg;
 102         unsigned long flags;
 103
 104         /* dma completion handler cannot submit new operations */
 105         spin_lock_irqsave(&dmadata->dma_lock, flags);
 106         if (dmadata->frag_count >= 0) {
 107                 dmadata->dmacount--;
 108                 BUG_ON(dmadata->dmacount < 0);
 109                 tasklet_schedule(&dmadata->tasklet);
 110         }
 111         spin_unlock_irqrestore(&dmadata->dma_lock, flags);
 112 }
 113
 114 static struct dma_async_tx_descriptor *
 115 txx9aclc_dma_submit(struct txx9aclc_dmadata *dmadata, dma_addr_t buf_dma_addr)
 116 {
 117         struct dma_chan *chan = dmadata->dma_chan;
 118         struct dma_async_tx_descriptor *desc;
 119         struct scatterlist sg;
 120
 121         sg_init_table(&sg, 1);
 122         sg_set_page(&sg, pfn_to_page(PFN_DOWN(buf_dma_addr)),
 123                     dmadata->frag_bytes, buf_dma_addr & (PAGE_SIZE - 1));
 124         sg_dma_address(&sg) = buf_dma_addr;
 125         desc = chan->device->device_prep_slave_sg(chan, &sg, 1,
 126                 dmadata->substream->stream == SNDRV_PCM_STREAM_PLAYBACK ?
 127                 DMA_TO_DEVICE : DMA_FROM_DEVICE,
 128                 DMA_PREP_INTERRUPT | DMA_CTRL_ACK);
 129         if (!desc) {
 130                 dev_err(&chan->dev->device, "cannot prepare slave dma\n");
 131                 return NULL;
 132         }
 133         desc->callback = txx9aclc_dma_complete;
 134         desc->callback_param = dmadata;
 135         desc->tx_submit(desc);
 136         return desc;
 137 }
 138
 139 #define NR_DMA_CHAIN            2
 140
 141 static void txx9aclc_dma_tasklet(unsigned long data)
 142 {
 143         struct txx9aclc_dmadata *dmadata = (struct txx9aclc_dmadata *)data;
 144         struct dma_chan *chan = dmadata->dma_chan;
 145         struct dma_async_tx_descriptor *desc;
 146         struct snd_pcm_substream *substream = dmadata->substream;
 147         u32 ctlbit = substream->stream == SNDRV_PCM_STREAM_PLAYBACK ?
 148                 ACCTL_AUDODMA : ACCTL_AUDIDMA;
 149         int i;
 150         unsigned long flags;
 151
 152         spin_lock_irqsave(&dmadata->dma_lock, flags);
 153         if (dmadata->frag_count < 0) {
 154                 struct txx9aclc_soc_device *dev =
 155                         container_of(dmadata, struct txx9aclc_soc_device,
 156                                      dmadata[substream->stream]);
 157                 struct txx9aclc_plat_drvdata *drvdata =
 158                         txx9aclc_get_plat_drvdata(dev);
 159                 void __iomem *base = drvdata->base;
 160
 161                 spin_unlock_irqrestore(&dmadata->dma_lock, flags);
 162                 chan->device->device_terminate_all(chan);
 163                 /* first time */
 164                 for (i = 0; i < NR_DMA_CHAIN; i++) {
 165                         desc = txx9aclc_dma_submit(dmadata,
 166                                 dmadata->dma_addr + i * dmadata->frag_bytes);
 167                         if (!desc)
 168                                 return;
 169                 }
 170                 dmadata->dmacount = NR_DMA_CHAIN;
 171                 chan->device->device_issue_pending(chan);
 172                 spin_lock_irqsave(&dmadata->dma_lock, flags);
 173                 __raw_writel(ctlbit, base + ACCTLEN);
 174                 dmadata->frag_count = NR_DMA_CHAIN % dmadata->frags;
 175                 spin_unlock_irqrestore(&dmadata->dma_lock, flags);
 176                 return;
 177         }
 178         BUG_ON(dmadata->dmacount >= NR_DMA_CHAIN);
 179         while (dmadata->dmacount < NR_DMA_CHAIN) {
 180                 dmadata->dmacount++;
 181                 spin_unlock_irqrestore(&dmadata->dma_lock, flags);
 182                 desc = txx9aclc_dma_submit(dmadata,
 183                         dmadata->dma_addr +
 184                         dmadata->frag_count * dmadata->frag_bytes);
 185                 if (!desc)
 186                         return;
 187                 chan->device->device_issue_pending(chan);
 188
 189                 spin_lock_irqsave(&dmadata->dma_lock, flags);
 190                 dmadata->frag_count++;
 191                 dmadata->frag_count %= dmadata->frags;
 192                 dmadata->pos += dmadata->frag_bytes;
 193                 dmadata->pos %= dmadata->buffer_bytes;
 194                 if ((dmadata->frag_count * dmadata->frag_bytes) %
 195                     dmadata->period_bytes == 0)
 196                         snd_pcm_period_elapsed(substream);
 197         }
 198         spin_unlock_irqrestore(&dmadata->dma_lock, flags);
 199 }
 200
 201 static int txx9aclc_pcm_trigger(struct snd_pcm_substream *substream, int cmd)
 202 {
 203         struct txx9aclc_dmadata *dmadata = substream->runtime->private_data;
 204         struct snd_soc_pcm_runtime *rtd = substream->private_data;
 205         struct txx9aclc_soc_device *dev =
 206                 container_of(rtd->socdev, struct txx9aclc_soc_device, soc_dev);
 207         struct txx9aclc_plat_drvdata *drvdata = txx9aclc_get_plat_drvdata(dev);
 208         void __iomem *base = drvdata->base;
 209         unsigned long flags;
 210         int ret = 0;
 211         u32 ctlbit = substream->stream == SNDRV_PCM_STREAM_PLAYBACK ?
 212                 ACCTL_AUDODMA : ACCTL_AUDIDMA;
 213
 214         spin_lock_irqsave(&dmadata->dma_lock, flags);
 215         switch (cmd) {
 216         case SNDRV_PCM_TRIGGER_START:
 217                 dmadata->frag_count = -1;
 218                 tasklet_schedule(&dmadata->tasklet);
 219                 break;
 220         case SNDRV_PCM_TRIGGER_STOP:
 221         case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
 222         case SNDRV_PCM_TRIGGER_SUSPEND:
 223                 __raw_writel(ctlbit, base + ACCTLDIS);
 224                 break;
 225         case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
 226         case SNDRV_PCM_TRIGGER_RESUME:
 227                 __raw_writel(ctlbit, base + ACCTLEN);
 228                 break;
 229         default:
 230                 ret = -EINVAL;
 231         }
 232         spin_unlock_irqrestore(&dmadata->dma_lock, flags);
 233         return ret;
 234 }
 235
 236 static snd_pcm_uframes_t
 237 txx9aclc_pcm_pointer(struct snd_pcm_substream *substream)
 238 {
 239         struct txx9aclc_dmadata *dmadata = substream->runtime->private_data;
 240
 241         return bytes_to_frames(substream->runtime, dmadata->pos);
 242 }
 243
 244 static int txx9aclc_pcm_open(struct snd_pcm_substream *substream)
 245 {
 246         struct snd_soc_pcm_runtime *rtd = substream->private_data;
 247         struct txx9aclc_soc_device *dev =
 248                 container_of(rtd->socdev, struct txx9aclc_soc_device, soc_dev);
 249         struct txx9aclc_dmadata *dmadata = &dev->dmadata[substream->stream];
 250         int ret;
 251
 252         ret = snd_soc_set_runtime_hwparams(substream, &txx9aclc_pcm_hardware);
 253         if (ret)
 254                 return ret;
 255         /* ensure that buffer size is a multiple of period size */
 256         ret = snd_pcm_hw_constraint_integer(substream->runtime,
 257                                             SNDRV_PCM_HW_PARAM_PERIODS);
 258         if (ret < 0)
 259                 return ret;
 260         substream->runtime->private_data = dmadata;
 261         return 0;
 262 }
 263
 264 static int txx9aclc_pcm_close(struct snd_pcm_substream *substream)
 265 {
 266         struct txx9aclc_dmadata *dmadata = substream->runtime->private_data;
 267         struct dma_chan *chan = dmadata->dma_chan;
 268
 269         dmadata->frag_count = -1;
 270         chan->device->device_terminate_all(chan);
 271         return 0;
 272 }
 273
 274 static struct snd_pcm_ops txx9aclc_pcm_ops = {
 275         .open           = txx9aclc_pcm_open,
 276         .close          = txx9aclc_pcm_close,
 277         .ioctl          = snd_pcm_lib_ioctl,
 278         .hw_params      = txx9aclc_pcm_hw_params,
 279         .hw_free        = txx9aclc_pcm_hw_free,
 280         .prepare        = txx9aclc_pcm_prepare,
 281         .trigger        = txx9aclc_pcm_trigger,
 282         .pointer        = txx9aclc_pcm_pointer,
 283 };
 284
 285 static void txx9aclc_pcm_free_dma_buffers(struct snd_pcm *pcm)
 286 {
 287         snd_pcm_lib_preallocate_free_for_all(pcm);
 288 }
 289
 290 static int txx9aclc_pcm_new(struct snd_card *card, struct snd_soc_dai *dai,
 291                             struct snd_pcm *pcm)
 292 {
 293         return snd_pcm_lib_preallocate_pages_for_all(pcm, SNDRV_DMA_TYPE_DEV,
 294                 card->dev, 64 * 1024, 4 * 1024 * 1024);
 295 }
 296
 297 static bool filter(struct dma_chan *chan, void *param)
 298 {
 299         struct txx9aclc_dmadata *dmadata = param;
 300         char *devname;
 301         bool found = false;
 302
 303         devname = kasprintf(GFP_KERNEL, "%s.%d", dmadata->dma_res->name,
 304                 (int)dmadata->dma_res->start);
 305         if (strcmp(dev_name(chan->device->dev), devname) == 0) {
 306                 chan->private = &dmadata->dma_slave;
 307                 found = true;
 308         }
 309         kfree(devname);
 310         return found;
 311 }
 312
 313 static int txx9aclc_dma_init(struct txx9aclc_soc_device *dev,
 314                              struct txx9aclc_dmadata *dmadata)
 315 {
 316         struct txx9aclc_plat_drvdata *drvdata = txx9aclc_get_plat_drvdata(dev);
 317         struct txx9dmac_slave *ds = &dmadata->dma_slave;
 318         dma_cap_mask_t mask;
 319
 320         spin_lock_init(&dmadata->dma_lock);
 321
 322         ds->reg_width = sizeof(u32);
 323         if (dmadata->stream == SNDRV_PCM_STREAM_PLAYBACK) {
 324                 ds->tx_reg = drvdata->physbase + ACAUDODAT;
 325                 ds->rx_reg = 0;
 326         } else {
 327                 ds->tx_reg = 0;
 328                 ds->rx_reg = drvdata->physbase + ACAUDIDAT;
 329         }
 330
 331         /* Try to grab a DMA channel */
 332         dma_cap_zero(mask);
 333         dma_cap_set(DMA_SLAVE, mask);
 334         dmadata->dma_chan = dma_request_channel(mask, filter, dmadata);
 335         if (!dmadata->dma_chan) {
 336                 dev_err(dev->soc_dev.dev,
 337                         "DMA channel for %s is not available\n",
 338                         dmadata->stream == SNDRV_PCM_STREAM_PLAYBACK ?
 339                         "playback" : "capture");
 340                 return -EBUSY;
 341         }
 342         tasklet_init(&dmadata->tasklet, txx9aclc_dma_tasklet,
 343                      (unsigned long)dmadata);
 344         return 0;
 345 }
 346
 347 static int txx9aclc_pcm_probe(struct platform_device *pdev)
 348 {
 349         struct snd_soc_device *socdev = platform_get_drvdata(pdev);
 350         struct txx9aclc_soc_device *dev =
 351                 container_of(socdev, struct txx9aclc_soc_device, soc_dev);
 352         struct resource *r;
 353         int i;
 354         int ret;
 355
 356         dev->dmadata[0].stream = SNDRV_PCM_STREAM_PLAYBACK;
 357         dev->dmadata[1].stream = SNDRV_PCM_STREAM_CAPTURE;
 358         for (i = 0; i < 2; i++) {
 359                 r = platform_get_resource(dev->aclc_pdev, IORESOURCE_DMA, i);
 360                 if (!r) {
 361                         ret = -EBUSY;
 362                         goto exit;
 363                 }
 364                 dev->dmadata[i].dma_res = r;
 365                 ret = txx9aclc_dma_init(dev, &dev->dmadata[i]);
 366                 if (ret)
 367                         goto exit;
 368         }
 369         return 0;
 370
 371 exit:
 372         for (i = 0; i < 2; i++) {
 373                 if (dev->dmadata[i].dma_chan)
 374                         dma_release_channel(dev->dmadata[i].dma_chan);
 375                 dev->dmadata[i].dma_chan = NULL;
 376         }
 377         return ret;
 378 }
 379
 380 static int txx9aclc_pcm_remove(struct platform_device *pdev)
 381 {
 382         struct snd_soc_device *socdev = platform_get_drvdata(pdev);
 383         struct txx9aclc_soc_device *dev =
 384                 container_of(socdev, struct txx9aclc_soc_device, soc_dev);
 385         struct txx9aclc_plat_drvdata *drvdata = txx9aclc_get_plat_drvdata(dev);
 386         void __iomem *base = drvdata->base;
 387         int i;
 388
 389         /* disable all FIFO DMAs */
 390         __raw_writel(ACCTL_AUDODMA | ACCTL_AUDIDMA, base + ACCTLDIS);
 391         /* dummy R/W to clear pending DMAREQ if any */
 392         __raw_writel(__raw_readl(base + ACAUDIDAT), base + ACAUDODAT);
 393
 394         for (i = 0; i < 2; i++) {
 395                 struct txx9aclc_dmadata *dmadata = &dev->dmadata[i];
 396                 struct dma_chan *chan = dmadata->dma_chan;
 397                 if (chan) {
 398                         dmadata->frag_count = -1;
 399                         chan->device->device_terminate_all(chan);
 400                         dma_release_channel(chan);
 401                 }
 402                 dev->dmadata[i].dma_chan = NULL;
 403         }
 404         return 0;
 405 }
 406
 407 struct snd_soc_platform txx9aclc_soc_platform = {
 408         .name           = "txx9aclc-audio",
 409         .probe          = txx9aclc_pcm_probe,
 410         .remove         = txx9aclc_pcm_remove,
 411         .pcm_ops        = &txx9aclc_pcm_ops,
 412         .pcm_new        = txx9aclc_pcm_new,
 413         .pcm_free       = txx9aclc_pcm_free_dma_buffers,
 414 };
 415 EXPORT_SYMBOL_GPL(txx9aclc_soc_platform);
 416
 417 static int __init txx9aclc_soc_platform_init(void)
 418 {
 419         return snd_soc_register_platform(&txx9aclc_soc_platform);
 420 }
 421
 422 static void __exit txx9aclc_soc_platform_exit(void)
 423 {
 424         snd_soc_unregister_platform(&txx9aclc_soc_platform);
 425 }
 426
 427 module_init(txx9aclc_soc_platform_init);
 428 module_exit(txx9aclc_soc_platform_exit);
 429
 430 MODULE_AUTHOR("Atsushi Nemoto <anemo@mba.ocn.ne.jp>");
 431 MODULE_DESCRIPTION("TXx9 ACLC Audio DMA driver");
 432 MODULE_LICENSE("GPL");