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                 BUG_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         BUG_ON(dmadata->dmacount >= NR_DMA_CHAIN);
 185         while (dmadata->dmacount < NR_DMA_CHAIN) {
 186                 dmadata->dmacount++;
 187                 spin_unlock_irqrestore(&dmadata->dma_lock, flags);
 188                 desc = txx9aclc_dma_submit(dmadata,
 189                         dmadata->dma_addr +
 190                         dmadata->frag_count * dmadata->frag_bytes);
 191                 if (!desc)
 192                         return;
 193                 chan->device->device_issue_pending(chan);
 194
 195                 spin_lock_irqsave(&dmadata->dma_lock, flags);
 196                 dmadata->frag_count++;
 197                 dmadata->frag_count %= dmadata->frags;
 198                 dmadata->pos += dmadata->frag_bytes;
 199                 dmadata->pos %= dmadata->buffer_bytes;
 200                 if ((dmadata->frag_count * dmadata->frag_bytes) %
 201                     dmadata->period_bytes == 0)
 202                         snd_pcm_period_elapsed(substream);
 203         }
 204         spin_unlock_irqrestore(&dmadata->dma_lock, flags);
 205 }
 206
 207 static int txx9aclc_pcm_trigger(struct snd_pcm_substream *substream, int cmd)
 208 {
 209         struct txx9aclc_dmadata *dmadata = substream->runtime->private_data;
 210         struct txx9aclc_plat_drvdata *drvdata =txx9aclc_drvdata;
 211         void __iomem *base = drvdata->base;
 212         unsigned long flags;
 213         int ret = 0;
 214         u32 ctlbit = substream->stream == SNDRV_PCM_STREAM_PLAYBACK ?
 215                 ACCTL_AUDODMA : ACCTL_AUDIDMA;
 216
 217         spin_lock_irqsave(&dmadata->dma_lock, flags);
 218         switch (cmd) {
 219         case SNDRV_PCM_TRIGGER_START:
 220                 dmadata->frag_count = -1;
 221                 tasklet_schedule(&dmadata->tasklet);
 222                 break;
 223         case SNDRV_PCM_TRIGGER_STOP:
 224         case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
 225         case SNDRV_PCM_TRIGGER_SUSPEND:
 226                 __raw_writel(ctlbit, base + ACCTLDIS);
 227                 break;
 228         case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
 229         case SNDRV_PCM_TRIGGER_RESUME:
 230                 __raw_writel(ctlbit, base + ACCTLEN);
 231                 break;
 232         default:
 233                 ret = -EINVAL;
 234         }
 235         spin_unlock_irqrestore(&dmadata->dma_lock, flags);
 236         return ret;
 237 }
 238
 239 static snd_pcm_uframes_t
 240 txx9aclc_pcm_pointer(struct snd_pcm_substream *substream)
 241 {
 242         struct txx9aclc_dmadata *dmadata = substream->runtime->private_data;
 243
 244         return bytes_to_frames(substream->runtime, dmadata->pos);
 245 }
 246
 247 static int txx9aclc_pcm_open(struct snd_pcm_substream *substream)
 248 {
 249         struct txx9aclc_soc_device *dev = &txx9aclc_soc_device;
 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_control(chan, DMA_TERMINATE_ALL, 0);
 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_soc_pcm_runtime *rtd)
 292 {
 293         struct snd_card *card = rtd->card->snd_card;
 294         struct snd_soc_dai *dai = rtd->cpu_dai;
 295         struct snd_pcm *pcm = rtd->pcm;
 296         struct platform_device *pdev = to_platform_device(dai->platform->dev);
 297         struct txx9aclc_soc_device *dev;
 298         struct resource *r;
 299         int i;
 300         int ret;
 301
 302         /* at this point onwards the AC97 component has probed and this will be valid */
 303         dev = snd_soc_dai_get_drvdata(dai);
 304
 305         dev->dmadata[0].stream = SNDRV_PCM_STREAM_PLAYBACK;
 306         dev->dmadata[1].stream = SNDRV_PCM_STREAM_CAPTURE;
 307         for (i = 0; i < 2; i++) {
 308                 r = platform_get_resource(pdev, IORESOURCE_DMA, i);
 309                 if (!r) {
 310                         ret = -EBUSY;
 311                         goto exit;
 312                 }
 313                 dev->dmadata[i].dma_res = r;
 314                 ret = txx9aclc_dma_init(dev, &dev->dmadata[i]);
 315                 if (ret)
 316                         goto exit;
 317         }
 318         return snd_pcm_lib_preallocate_pages_for_all(pcm, SNDRV_DMA_TYPE_DEV,
 319                 card->dev, 64 * 1024, 4 * 1024 * 1024);
 320
 321 exit:
 322         for (i = 0; i < 2; i++) {
 323                 if (dev->dmadata[i].dma_chan)
 324                         dma_release_channel(dev->dmadata[i].dma_chan);
 325                 dev->dmadata[i].dma_chan = NULL;
 326         }
 327         return ret;
 328 }
 329
 330 static bool filter(struct dma_chan *chan, void *param)
 331 {
 332         struct txx9aclc_dmadata *dmadata = param;
 333         char *devname;
 334         bool found = false;
 335
 336         devname = kasprintf(GFP_KERNEL, "%s.%d", dmadata->dma_res->name,
 337                 (int)dmadata->dma_res->start);
 338         if (strcmp(dev_name(chan->device->dev), devname) == 0) {
 339                 chan->private = &dmadata->dma_slave;
 340                 found = true;
 341         }
 342         kfree(devname);
 343         return found;
 344 }
 345
 346 static int txx9aclc_dma_init(struct txx9aclc_soc_device *dev,
 347                              struct txx9aclc_dmadata *dmadata)
 348 {
 349         struct txx9aclc_plat_drvdata *drvdata =txx9aclc_drvdata;
 350         struct txx9dmac_slave *ds = &dmadata->dma_slave;
 351         dma_cap_mask_t mask;
 352
 353         spin_lock_init(&dmadata->dma_lock);
 354
 355         ds->reg_width = sizeof(u32);
 356         if (dmadata->stream == SNDRV_PCM_STREAM_PLAYBACK) {
 357                 ds->tx_reg = drvdata->physbase + ACAUDODAT;
 358                 ds->rx_reg = 0;
 359         } else {
 360                 ds->tx_reg = 0;
 361                 ds->rx_reg = drvdata->physbase + ACAUDIDAT;
 362         }
 363
 364         /* Try to grab a DMA channel */
 365         dma_cap_zero(mask);
 366         dma_cap_set(DMA_SLAVE, mask);
 367         dmadata->dma_chan = dma_request_channel(mask, filter, dmadata);
 368         if (!dmadata->dma_chan) {
 369                 printk(KERN_ERR
 370                         "DMA channel for %s is not available\n",
 371                         dmadata->stream == SNDRV_PCM_STREAM_PLAYBACK ?
 372                         "playback" : "capture");
 373                 return -EBUSY;
 374         }
 375         tasklet_init(&dmadata->tasklet, txx9aclc_dma_tasklet,
 376                      (unsigned long)dmadata);
 377         return 0;
 378 }
 379
 380 static int txx9aclc_pcm_probe(struct snd_soc_platform *platform)
 381 {
 382         snd_soc_platform_set_drvdata(platform, &txx9aclc_soc_device);
 383         return 0;
 384 }
 385
 386 static int txx9aclc_pcm_remove(struct snd_soc_platform *platform)
 387 {
 388         struct txx9aclc_soc_device *dev = snd_soc_platform_get_drvdata(platform);
 389         struct txx9aclc_plat_drvdata *drvdata = txx9aclc_drvdata;
 390         void __iomem *base = drvdata->base;
 391         int i;
 392
 393         /* disable all FIFO DMAs */
 394         __raw_writel(ACCTL_AUDODMA | ACCTL_AUDIDMA, base + ACCTLDIS);
 395         /* dummy R/W to clear pending DMAREQ if any */
 396         __raw_writel(__raw_readl(base + ACAUDIDAT), base + ACAUDODAT);
 397
 398         for (i = 0; i < 2; i++) {
 399                 struct txx9aclc_dmadata *dmadata = &dev->dmadata[i];
 400                 struct dma_chan *chan = dmadata->dma_chan;
 401                 if (chan) {
 402                         dmadata->frag_count = -1;
 403                         chan->device->device_control(chan,
 404                                                      DMA_TERMINATE_ALL, 0);
 405                         dma_release_channel(chan);
 406                 }
 407                 dev->dmadata[i].dma_chan = NULL;
 408         }
 409         return 0;
 410 }
 411
 412 static struct snd_soc_platform_driver txx9aclc_soc_platform = {
 413         .probe          = txx9aclc_pcm_probe,
 414         .remove         = txx9aclc_pcm_remove,
 415         .ops            = &txx9aclc_pcm_ops,
 416         .pcm_new        = txx9aclc_pcm_new,
 417         .pcm_free       = txx9aclc_pcm_free_dma_buffers,
 418 };
 419
 420 static int txx9aclc_soc_platform_probe(struct platform_device *pdev)
 421 {
 422         return snd_soc_register_platform(&pdev->dev, &txx9aclc_soc_platform);
 423 }
 424
 425 static int txx9aclc_soc_platform_remove(struct platform_device *pdev)
 426 {
 427         snd_soc_unregister_platform(&pdev->dev);
 428         return 0;
 429 }
 430
 431 static struct platform_driver txx9aclc_pcm_driver = {
 432         .driver = {
 433                         .name = "txx9aclc-pcm-audio",
 434                         .owner = THIS_MODULE,
 435         },
 436
 437         .probe = txx9aclc_soc_platform_probe,
 438         .remove = txx9aclc_soc_platform_remove,
 439 };
 440
 441 module_platform_driver(txx9aclc_pcm_driver);
 442
 443 MODULE_AUTHOR("Atsushi Nemoto <anemo@mba.ocn.ne.jp>");
 444 MODULE_DESCRIPTION("TXx9 ACLC Audio DMA driver");
 445 MODULE_LICENSE("GPL");