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