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