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 struct txx9aclc_soc_device {
  26         struct txx9aclc_dmadata dmadata[2];
  27 } txx9aclc_soc_device;
  28
  29 /* REVISIT: How to find txx9aclc_drvdata from snd_ac97? */
  30 static struct txx9aclc_plat_drvdata *txx9aclc_drvdata;
  31
  32 static int txx9aclc_dma_init(struct txx9aclc_soc_device *dev,
  33                              struct txx9aclc_dmadata *dmadata);
  34
  35 static const struct snd_pcm_hardware txx9aclc_pcm_hardware = {
  36         /*
  37          * REVISIT: SNDRV_PCM_INFO_MMAP | SNDRV_PCM_INFO_MMAP_VALID
  38          * needs more works for noncoherent MIPS.
  39          */
  40         .info             = SNDRV_PCM_INFO_INTERLEAVED |
  41                             SNDRV_PCM_INFO_BATCH |
  42                             SNDRV_PCM_INFO_PAUSE,
  43 #ifdef __BIG_ENDIAN
  44         .formats          = SNDRV_PCM_FMTBIT_S16_BE,
  45 #else
  46         .formats          = SNDRV_PCM_FMTBIT_S16_LE,
  47 #endif
  48         .period_bytes_min = 1024,
  49         .period_bytes_max = 8 * 1024,
  50         .periods_min      = 2,
  51         .periods_max      = 4096,
  52         .buffer_bytes_max = 32 * 1024,
  53 };
  54
  55 static int txx9aclc_pcm_hw_params(struct snd_pcm_substream *substream,
  56                                   struct snd_pcm_hw_params *params)
  57 {
  58         struct snd_soc_pcm_runtime *rtd = snd_pcm_substream_chip(substream);
  59         struct snd_pcm_runtime *runtime = substream->runtime;
  60         struct txx9aclc_dmadata *dmadata = runtime->private_data;
  61         int ret;
  62
  63         ret = snd_pcm_lib_malloc_pages(substream, params_buffer_bytes(params));
  64         if (ret < 0)
  65                 return ret;
  66
  67         dev_dbg(rtd->platform->dev,
  68                 "runtime->dma_area = %#lx dma_addr = %#lx dma_bytes = %zd "
  69                 "runtime->min_align %ld\n",
  70                 (unsigned long)runtime->dma_area,
  71                 (unsigned long)runtime->dma_addr, runtime->dma_bytes,
  72                 runtime->min_align);
  73         dev_dbg(rtd->platform->dev,
  74                 "periods %d period_bytes %d stream %d\n",
  75                 params_periods(params), params_period_bytes(params),
  76                 substream->stream);
  77
  78         dmadata->substream = substream;
  79         dmadata->pos = 0;
  80         return 0;
  81 }
  82
  83 static int txx9aclc_pcm_hw_free(struct snd_pcm_substream *substream)
  84 {
  85         return snd_pcm_lib_free_pages(substream);
  86 }
  87
  88 static int txx9aclc_pcm_prepare(struct snd_pcm_substream *substream)
  89 {
  90         struct snd_pcm_runtime *runtime = substream->runtime;
  91         struct txx9aclc_dmadata *dmadata = runtime->private_data;
  92
  93         dmadata->dma_addr = runtime->dma_addr;
  94         dmadata->buffer_bytes = snd_pcm_lib_buffer_bytes(substream);
  95         dmadata->period_bytes = snd_pcm_lib_period_bytes(substream);
  96
  97         if (dmadata->buffer_bytes == dmadata->period_bytes) {
  98                 dmadata->frag_bytes = dmadata->period_bytes >> 1;
  99                 dmadata->frags = 2;
 100         } else {
 101                 dmadata->frag_bytes = dmadata->period_bytes;
 102                 dmadata->frags = dmadata->buffer_bytes / dmadata->period_bytes;
 103         }
 104         dmadata->frag_count = 0;
 105         dmadata->pos = 0;
 106         return 0;
 107 }
 108
 109 static void txx9aclc_dma_complete(void *arg)
 110 {
 111         struct txx9aclc_dmadata *dmadata = arg;
 112         unsigned long flags;
 113
 114         /* dma completion handler cannot submit new operations */
 115         spin_lock_irqsave(&dmadata->dma_lock, flags);
 116         if (dmadata->frag_count >= 0) {
 117                 dmadata->dmacount--;
 118                 if (!WARN_ON(dmadata->dmacount < 0))
 119                         tasklet_schedule(&dmadata->tasklet);
 120         }
 121         spin_unlock_irqrestore(&dmadata->dma_lock, flags);
 122 }
 123
 124 static struct dma_async_tx_descriptor *
 125 txx9aclc_dma_submit(struct txx9aclc_dmadata *dmadata, dma_addr_t buf_dma_addr)
 126 {
 127         struct dma_chan *chan = dmadata->dma_chan;
 128         struct dma_async_tx_descriptor *desc;
 129         struct scatterlist sg;
 130
 131         sg_init_table(&sg, 1);
 132         sg_set_page(&sg, pfn_to_page(PFN_DOWN(buf_dma_addr)),
 133                     dmadata->frag_bytes, buf_dma_addr & (PAGE_SIZE - 1));
 134         sg_dma_address(&sg) = buf_dma_addr;
 135         desc = dmaengine_prep_slave_sg(chan, &sg, 1,
 136                 dmadata->substream->stream == SNDRV_PCM_STREAM_PLAYBACK ?
 137                 DMA_MEM_TO_DEV : DMA_DEV_TO_MEM,
 138                 DMA_PREP_INTERRUPT | DMA_CTRL_ACK);
 139         if (!desc) {
 140                 dev_err(&chan->dev->device, "cannot prepare slave dma\n");
 141                 return NULL;
 142         }
 143         desc->callback = txx9aclc_dma_complete;
 144         desc->callback_param = dmadata;
 145         desc->tx_submit(desc);
 146         return desc;
 147 }
 148
 149 #define NR_DMA_CHAIN            2
 150
 151 static void txx9aclc_dma_tasklet(unsigned long data)
 152 {
 153         struct txx9aclc_dmadata *dmadata = (struct txx9aclc_dmadata *)data;
 154         struct dma_chan *chan = dmadata->dma_chan;
 155         struct dma_async_tx_descriptor *desc;
 156         struct snd_pcm_substream *substream = dmadata->substream;
 157         u32 ctlbit = substream->stream == SNDRV_PCM_STREAM_PLAYBACK ?
 158                 ACCTL_AUDODMA : ACCTL_AUDIDMA;
 159         int i;
 160         unsigned long flags;
 161
 162         spin_lock_irqsave(&dmadata->dma_lock, flags);
 163         if (dmadata->frag_count < 0) {
 164                 struct txx9aclc_plat_drvdata *drvdata = txx9aclc_drvdata;
 165                 void __iomem *base = drvdata->base;
 166
 167                 spin_unlock_irqrestore(&dmadata->dma_lock, flags);
 168                 chan->device->device_control(chan, DMA_TERMINATE_ALL, 0);
 169                 /* first time */
 170                 for (i = 0; i < NR_DMA_CHAIN; i++) {
 171                         desc = txx9aclc_dma_submit(dmadata,
 172                                 dmadata->dma_addr + i * dmadata->frag_bytes);
 173                         if (!desc)
 174                                 return;
 175                 }
 176                 dmadata->dmacount = NR_DMA_CHAIN;
 177                 chan->device->device_issue_pending(chan);
 178                 spin_lock_irqsave(&dmadata->dma_lock, flags);
 179                 __raw_writel(ctlbit, base + ACCTLEN);
 180                 dmadata->frag_count = NR_DMA_CHAIN % dmadata->frags;
 181                 spin_unlock_irqrestore(&dmadata->dma_lock, flags);
 182                 return;
 183         }
 184         if (WARN_ON(dmadata->dmacount >= NR_DMA_CHAIN)) {
 185                 spin_unlock_irqrestore(&dmadata->dma_lock, flags);
 186                 return;
 187         }
 188         while (dmadata->dmacount < NR_DMA_CHAIN) {
 189                 dmadata->dmacount++;
 190                 spin_unlock_irqrestore(&dmadata->dma_lock, flags);
 191                 desc = txx9aclc_dma_submit(dmadata,
 192                         dmadata->dma_addr +
 193                         dmadata->frag_count * dmadata->frag_bytes);
 194                 if (!desc)
 195                         return;
 196                 chan->device->device_issue_pending(chan);
 197
 198                 spin_lock_irqsave(&dmadata->dma_lock, flags);
 199                 dmadata->frag_count++;
 200                 dmadata->frag_count %= dmadata->frags;
 201                 dmadata->pos += dmadata->frag_bytes;
 202                 dmadata->pos %= dmadata->buffer_bytes;
 203                 if ((dmadata->frag_count * dmadata->frag_bytes) %
 204                     dmadata->period_bytes == 0)
 205                         snd_pcm_period_elapsed(substream);
 206         }
 207         spin_unlock_irqrestore(&dmadata->dma_lock, flags);
 208 }
 209
 210 static int txx9aclc_pcm_trigger(struct snd_pcm_substream *substream, int cmd)
 211 {
 212         struct txx9aclc_dmadata *dmadata = substream->runtime->private_data;
 213         struct txx9aclc_plat_drvdata *drvdata =txx9aclc_drvdata;
 214         void __iomem *base = drvdata->base;
 215         unsigned long flags;
 216         int ret = 0;
 217         u32 ctlbit = substream->stream == SNDRV_PCM_STREAM_PLAYBACK ?
 218                 ACCTL_AUDODMA : ACCTL_AUDIDMA;
 219
 220         spin_lock_irqsave(&dmadata->dma_lock, flags);
 221         switch (cmd) {
 222         case SNDRV_PCM_TRIGGER_START:
 223                 dmadata->frag_count = -1;
 224                 tasklet_schedule(&dmadata->tasklet);
 225                 break;
 226         case SNDRV_PCM_TRIGGER_STOP:
 227         case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
 228         case SNDRV_PCM_TRIGGER_SUSPEND:
 229                 __raw_writel(ctlbit, base + ACCTLDIS);
 230                 break;
 231         case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
 232         case SNDRV_PCM_TRIGGER_RESUME:
 233                 __raw_writel(ctlbit, base + ACCTLEN);
 234                 break;
 235         default:
 236                 ret = -EINVAL;
 237         }
 238         spin_unlock_irqrestore(&dmadata->dma_lock, flags);
 239         return ret;
 240 }
 241
 242 static snd_pcm_uframes_t
 243 txx9aclc_pcm_pointer(struct snd_pcm_substream *substream)
 244 {
 245         struct txx9aclc_dmadata *dmadata = substream->runtime->private_data;
 246
 247         return bytes_to_frames(substream->runtime, dmadata->pos);
 248 }
 249
 250 static int txx9aclc_pcm_open(struct snd_pcm_substream *substream)
 251 {
 252         struct txx9aclc_soc_device *dev = &txx9aclc_soc_device;
 253         struct txx9aclc_dmadata *dmadata = &dev->dmadata[substream->stream];
 254         int ret;
 255
 256         ret = snd_soc_set_runtime_hwparams(substream, &txx9aclc_pcm_hardware);
 257         if (ret)
 258                 return ret;
 259         /* ensure that buffer size is a multiple of period size */
 260         ret = snd_pcm_hw_constraint_integer(substream->runtime,
 261                                             SNDRV_PCM_HW_PARAM_PERIODS);
 262         if (ret < 0)
 263                 return ret;
 264         substream->runtime->private_data = dmadata;
 265         return 0;
 266 }
 267
 268 static int txx9aclc_pcm_close(struct snd_pcm_substream *substream)
 269 {
 270         struct txx9aclc_dmadata *dmadata = substream->runtime->private_data;
 271         struct dma_chan *chan = dmadata->dma_chan;
 272
 273         dmadata->frag_count = -1;
 274         chan->device->device_control(chan, DMA_TERMINATE_ALL, 0);
 275         return 0;
 276 }
 277
 278 static struct snd_pcm_ops txx9aclc_pcm_ops = {
 279         .open           = txx9aclc_pcm_open,
 280         .close          = txx9aclc_pcm_close,
 281         .ioctl          = snd_pcm_lib_ioctl,
 282         .hw_params      = txx9aclc_pcm_hw_params,
 283         .hw_free        = txx9aclc_pcm_hw_free,
 284         .prepare        = txx9aclc_pcm_prepare,
 285         .trigger        = txx9aclc_pcm_trigger,
 286         .pointer        = txx9aclc_pcm_pointer,
 287 };
 288
 289 static void txx9aclc_pcm_free_dma_buffers(struct snd_pcm *pcm)
 290 {
 291         snd_pcm_lib_preallocate_free_for_all(pcm);
 292 }
 293
 294 static int txx9aclc_pcm_new(struct snd_soc_pcm_runtime *rtd)
 295 {
 296         struct snd_card *card = rtd->card->snd_card;
 297         struct snd_soc_dai *dai = rtd->cpu_dai;
 298         struct snd_pcm *pcm = rtd->pcm;
 299         struct platform_device *pdev = to_platform_device(dai->platform->dev);
 300         struct txx9aclc_soc_device *dev;
 301         struct resource *r;
 302         int i;
 303         int ret;
 304
 305         /* at this point onwards the AC97 component has probed and this will be valid */
 306         dev = snd_soc_dai_get_drvdata(dai);
 307
 308         dev->dmadata[0].stream = SNDRV_PCM_STREAM_PLAYBACK;
 309         dev->dmadata[1].stream = SNDRV_PCM_STREAM_CAPTURE;
 310         for (i = 0; i < 2; i++) {
 311                 r = platform_get_resource(pdev, IORESOURCE_DMA, i);
 312                 if (!r) {
 313                         ret = -EBUSY;
 314                         goto exit;
 315                 }
 316                 dev->dmadata[i].dma_res = r;
 317                 ret = txx9aclc_dma_init(dev, &dev->dmadata[i]);
 318                 if (ret)
 319                         goto exit;
 320         }
 321         return snd_pcm_lib_preallocate_pages_for_all(pcm, SNDRV_DMA_TYPE_DEV,
 322                 card->dev, 64 * 1024, 4 * 1024 * 1024);
 323
 324 exit:
 325         for (i = 0; i < 2; i++) {
 326                 if (dev->dmadata[i].dma_chan)
 327                         dma_release_channel(dev->dmadata[i].dma_chan);
 328                 dev->dmadata[i].dma_chan = NULL;
 329         }
 330         return ret;
 331 }
 332
 333 static bool filter(struct dma_chan *chan, void *param)
 334 {
 335         struct txx9aclc_dmadata *dmadata = param;
 336         char *devname;
 337         bool found = false;
 338
 339         devname = kasprintf(GFP_KERNEL, "%s.%d", dmadata->dma_res->name,
 340                 (int)dmadata->dma_res->start);
 341         if (strcmp(dev_name(chan->device->dev), devname) == 0) {
 342                 chan->private = &dmadata->dma_slave;
 343                 found = true;
 344         }
 345         kfree(devname);
 346         return found;
 347 }
 348
 349 static int txx9aclc_dma_init(struct txx9aclc_soc_device *dev,
 350                              struct txx9aclc_dmadata *dmadata)
 351 {
 352         struct txx9aclc_plat_drvdata *drvdata =txx9aclc_drvdata;
 353         struct txx9dmac_slave *ds = &dmadata->dma_slave;
 354         dma_cap_mask_t mask;
 355
 356         spin_lock_init(&dmadata->dma_lock);
 357
 358         ds->reg_width = sizeof(u32);
 359         if (dmadata->stream == SNDRV_PCM_STREAM_PLAYBACK) {
 360                 ds->tx_reg = drvdata->physbase + ACAUDODAT;
 361                 ds->rx_reg = 0;
 362         } else {
 363                 ds->tx_reg = 0;
 364                 ds->rx_reg = drvdata->physbase + ACAUDIDAT;
 365         }
 366
 367         /* Try to grab a DMA channel */
 368         dma_cap_zero(mask);
 369         dma_cap_set(DMA_SLAVE, mask);
 370         dmadata->dma_chan = dma_request_channel(mask, filter, dmadata);
 371         if (!dmadata->dma_chan) {
 372                 printk(KERN_ERR
 373                         "DMA channel for %s is not available\n",
 374                         dmadata->stream == SNDRV_PCM_STREAM_PLAYBACK ?
 375                         "playback" : "capture");
 376                 return -EBUSY;
 377         }
 378         tasklet_init(&dmadata->tasklet, txx9aclc_dma_tasklet,
 379                      (unsigned long)dmadata);
 380         return 0;
 381 }
 382
 383 static int txx9aclc_pcm_probe(struct snd_soc_platform *platform)
 384 {
 385         snd_soc_platform_set_drvdata(platform, &txx9aclc_soc_device);
 386         return 0;
 387 }
 388
 389 static int txx9aclc_pcm_remove(struct snd_soc_platform *platform)
 390 {
 391         struct txx9aclc_soc_device *dev = snd_soc_platform_get_drvdata(platform);
 392         struct txx9aclc_plat_drvdata *drvdata = txx9aclc_drvdata;
 393         void __iomem *base = drvdata->base;
 394         int i;
 395
 396         /* disable all FIFO DMAs */
 397         __raw_writel(ACCTL_AUDODMA | ACCTL_AUDIDMA, base + ACCTLDIS);
 398         /* dummy R/W to clear pending DMAREQ if any */
 399         __raw_writel(__raw_readl(base + ACAUDIDAT), base + ACAUDODAT);
 400
 401         for (i = 0; i < 2; i++) {
 402                 struct txx9aclc_dmadata *dmadata = &dev->dmadata[i];
 403                 struct dma_chan *chan = dmadata->dma_chan;
 404                 if (chan) {
 405                         dmadata->frag_count = -1;
 406                         chan->device->device_control(chan,
 407                                                      DMA_TERMINATE_ALL, 0);
 408                         dma_release_channel(chan);
 409                 }
 410                 dev->dmadata[i].dma_chan = NULL;
 411         }
 412         return 0;
 413 }
 414
 415 static struct snd_soc_platform_driver txx9aclc_soc_platform = {
 416         .probe          = txx9aclc_pcm_probe,
 417         .remove         = txx9aclc_pcm_remove,
 418         .ops            = &txx9aclc_pcm_ops,
 419         .pcm_new        = txx9aclc_pcm_new,
 420         .pcm_free       = txx9aclc_pcm_free_dma_buffers,
 421 };
 422
 423 static int txx9aclc_soc_platform_probe(struct platform_device *pdev)
 424 {
 425         return snd_soc_register_platform(&pdev->dev, &txx9aclc_soc_platform);
 426 }
 427
 428 static int txx9aclc_soc_platform_remove(struct platform_device *pdev)
 429 {
 430         snd_soc_unregister_platform(&pdev->dev);
 431         return 0;
 432 }
 433
 434 static struct platform_driver txx9aclc_pcm_driver = {
 435         .driver = {
 436                         .name = "txx9aclc-pcm-audio",
 437                         .owner = THIS_MODULE,
 438         },
 439
 440         .probe = txx9aclc_soc_platform_probe,
 441         .remove = txx9aclc_soc_platform_remove,
 442 };
 443
 444 module_platform_driver(txx9aclc_pcm_driver);
 445
 446 MODULE_AUTHOR("Atsushi Nemoto <anemo@mba.ocn.ne.jp>");
 447 MODULE_DESCRIPTION("TXx9 ACLC Audio DMA driver");
 448 MODULE_LICENSE("GPL");