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 <linux/dmaengine.h>
  20 #include <sound/core.h>
  21 #include <sound/pcm.h>
  22 #include <sound/pcm_params.h>
  23 #include <sound/soc.h>
  24 #include "txx9aclc.h"
  25
  26 #define DRV_NAME "txx9aclc"
  27
  28 static struct txx9aclc_soc_device {
  29         struct txx9aclc_dmadata dmadata[2];
  30 } txx9aclc_soc_device;
  31
  32 /* REVISIT: How to find txx9aclc_drvdata from snd_ac97? */
  33 static struct txx9aclc_plat_drvdata *txx9aclc_drvdata;
  34
  35 static int txx9aclc_dma_init(struct txx9aclc_soc_device *dev,
  36                              struct txx9aclc_dmadata *dmadata);
  37
  38 static const struct snd_pcm_hardware txx9aclc_pcm_hardware = {
  39         /*
  40          * REVISIT: SNDRV_PCM_INFO_MMAP | SNDRV_PCM_INFO_MMAP_VALID
  41          * needs more works for noncoherent MIPS.
  42          */
  43         .info             = SNDRV_PCM_INFO_INTERLEAVED |
  44                             SNDRV_PCM_INFO_BATCH |
  45                             SNDRV_PCM_INFO_PAUSE,
  46         .period_bytes_min = 1024,
  47         .period_bytes_max = 8 * 1024,
  48         .periods_min      = 2,
  49         .periods_max      = 4096,
  50         .buffer_bytes_max = 32 * 1024,
  51 };
  52
  53 static int txx9aclc_pcm_hw_params(struct snd_pcm_substream *substream,
  54                                   struct snd_pcm_hw_params *params)
  55 {
  56         struct snd_soc_pcm_runtime *rtd = snd_pcm_substream_chip(substream);
  57         struct snd_pcm_runtime *runtime = substream->runtime;
  58         struct snd_soc_component *component = snd_soc_rtdcom_lookup(rtd, DRV_NAME);
  59         struct txx9aclc_dmadata *dmadata = runtime->private_data;
  60         int ret;
  61
  62         ret = snd_pcm_lib_malloc_pages(substream, params_buffer_bytes(params));
  63         if (ret < 0)
  64                 return ret;
  65
  66         dev_dbg(component->dev,
  67                 "runtime->dma_area = %#lx dma_addr = %#lx dma_bytes = %zd "
  68                 "runtime->min_align %ld\n",
  69                 (unsigned long)runtime->dma_area,
  70                 (unsigned long)runtime->dma_addr, runtime->dma_bytes,
  71                 runtime->min_align);
  72         dev_dbg(component->dev,
  73                 "periods %d period_bytes %d stream %d\n",
  74                 params_periods(params), params_period_bytes(params),
  75                 substream->stream);
  76
  77         dmadata->substream = substream;
  78         dmadata->pos = 0;
  79         return 0;
  80 }
  81
  82 static int txx9aclc_pcm_hw_free(struct snd_pcm_substream *substream)
  83 {
  84         return snd_pcm_lib_free_pages(substream);
  85 }
  86
  87 static int txx9aclc_pcm_prepare(struct snd_pcm_substream *substream)
  88 {
  89         struct snd_pcm_runtime *runtime = substream->runtime;
  90         struct txx9aclc_dmadata *dmadata = runtime->private_data;
  91
  92         dmadata->dma_addr = runtime->dma_addr;
  93         dmadata->buffer_bytes = snd_pcm_lib_buffer_bytes(substream);
  94         dmadata->period_bytes = snd_pcm_lib_period_bytes(substream);
  95
  96         if (dmadata->buffer_bytes == dmadata->period_bytes) {
  97                 dmadata->frag_bytes = dmadata->period_bytes >> 1;
  98                 dmadata->frags = 2;
  99         } else {
 100                 dmadata->frag_bytes = dmadata->period_bytes;
 101                 dmadata->frags = dmadata->buffer_bytes / dmadata->period_bytes;
 102         }
 103         dmadata->frag_count = 0;
 104         dmadata->pos = 0;
 105         return 0;
 106 }
 107
 108 static void txx9aclc_dma_complete(void *arg)
 109 {
 110         struct txx9aclc_dmadata *dmadata = arg;
 111         unsigned long flags;
 112
 113         /* dma completion handler cannot submit new operations */
 114         spin_lock_irqsave(&dmadata->dma_lock, flags);
 115         if (dmadata->frag_count >= 0) {
 116                 dmadata->dmacount--;
 117                 if (!WARN_ON(dmadata->dmacount < 0))
 118                         tasklet_schedule(&dmadata->tasklet);
 119         }
 120         spin_unlock_irqrestore(&dmadata->dma_lock, flags);
 121 }
 122
 123 static struct dma_async_tx_descriptor *
 124 txx9aclc_dma_submit(struct txx9aclc_dmadata *dmadata, dma_addr_t buf_dma_addr)
 125 {
 126         struct dma_chan *chan = dmadata->dma_chan;
 127         struct dma_async_tx_descriptor *desc;
 128         struct scatterlist sg;
 129
 130         sg_init_table(&sg, 1);
 131         sg_set_page(&sg, pfn_to_page(PFN_DOWN(buf_dma_addr)),
 132                     dmadata->frag_bytes, buf_dma_addr & (PAGE_SIZE - 1));
 133         sg_dma_address(&sg) = buf_dma_addr;
 134         desc = dmaengine_prep_slave_sg(chan, &sg, 1,
 135                 dmadata->substream->stream == SNDRV_PCM_STREAM_PLAYBACK ?
 136                 DMA_MEM_TO_DEV : DMA_DEV_TO_MEM,
 137                 DMA_PREP_INTERRUPT | DMA_CTRL_ACK);
 138         if (!desc) {
 139                 dev_err(&chan->dev->device, "cannot prepare slave dma\n");
 140                 return NULL;
 141         }
 142         desc->callback = txx9aclc_dma_complete;
 143         desc->callback_param = dmadata;
 144         dmaengine_submit(desc);
 145         return desc;
 146 }
 147
 148 #define NR_DMA_CHAIN            2
 149
 150 static void txx9aclc_dma_tasklet(unsigned long data)
 151 {
 152         struct txx9aclc_dmadata *dmadata = (struct txx9aclc_dmadata *)data;
 153         struct dma_chan *chan = dmadata->dma_chan;
 154         struct dma_async_tx_descriptor *desc;
 155         struct snd_pcm_substream *substream = dmadata->substream;
 156         u32 ctlbit = substream->stream == SNDRV_PCM_STREAM_PLAYBACK ?
 157                 ACCTL_AUDODMA : ACCTL_AUDIDMA;
 158         int i;
 159         unsigned long flags;
 160
 161         spin_lock_irqsave(&dmadata->dma_lock, flags);
 162         if (dmadata->frag_count < 0) {
 163                 struct txx9aclc_plat_drvdata *drvdata = txx9aclc_drvdata;
 164                 void __iomem *base = drvdata->base;
 165
 166                 spin_unlock_irqrestore(&dmadata->dma_lock, flags);
 167                 dmaengine_terminate_all(chan);
 168                 /* first time */
 169                 for (i = 0; i < NR_DMA_CHAIN; i++) {
 170                         desc = txx9aclc_dma_submit(dmadata,
 171                                 dmadata->dma_addr + i * dmadata->frag_bytes);
 172                         if (!desc)
 173                                 return;
 174                 }
 175                 dmadata->dmacount = NR_DMA_CHAIN;
 176                 dma_async_issue_pending(chan);
 177                 spin_lock_irqsave(&dmadata->dma_lock, flags);
 178                 __raw_writel(ctlbit, base + ACCTLEN);
 179                 dmadata->frag_count = NR_DMA_CHAIN % dmadata->frags;
 180                 spin_unlock_irqrestore(&dmadata->dma_lock, flags);
 181                 return;
 182         }
 183         if (WARN_ON(dmadata->dmacount >= NR_DMA_CHAIN)) {
 184                 spin_unlock_irqrestore(&dmadata->dma_lock, flags);
 185                 return;
 186         }
 187         while (dmadata->dmacount < NR_DMA_CHAIN) {
 188                 dmadata->dmacount++;
 189                 spin_unlock_irqrestore(&dmadata->dma_lock, flags);
 190                 desc = txx9aclc_dma_submit(dmadata,
 191                         dmadata->dma_addr +
 192                         dmadata->frag_count * dmadata->frag_bytes);
 193                 if (!desc)
 194                         return;
 195                 dma_async_issue_pending(chan);
 196
 197                 spin_lock_irqsave(&dmadata->dma_lock, flags);
 198                 dmadata->frag_count++;
 199                 dmadata->frag_count %= dmadata->frags;
 200                 dmadata->pos += dmadata->frag_bytes;
 201                 dmadata->pos %= dmadata->buffer_bytes;
 202                 if ((dmadata->frag_count * dmadata->frag_bytes) %
 203                     dmadata->period_bytes == 0)
 204                         snd_pcm_period_elapsed(substream);
 205         }
 206         spin_unlock_irqrestore(&dmadata->dma_lock, flags);
 207 }
 208
 209 static int txx9aclc_pcm_trigger(struct snd_pcm_substream *substream, int cmd)
 210 {
 211         struct txx9aclc_dmadata *dmadata = substream->runtime->private_data;
 212         struct txx9aclc_plat_drvdata *drvdata = txx9aclc_drvdata;
 213         void __iomem *base = drvdata->base;
 214         unsigned long flags;
 215         int ret = 0;
 216         u32 ctlbit = substream->stream == SNDRV_PCM_STREAM_PLAYBACK ?
 217                 ACCTL_AUDODMA : ACCTL_AUDIDMA;
 218
 219         spin_lock_irqsave(&dmadata->dma_lock, flags);
 220         switch (cmd) {
 221         case SNDRV_PCM_TRIGGER_START:
 222                 dmadata->frag_count = -1;
 223                 tasklet_schedule(&dmadata->tasklet);
 224                 break;
 225         case SNDRV_PCM_TRIGGER_STOP:
 226         case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
 227         case SNDRV_PCM_TRIGGER_SUSPEND:
 228                 __raw_writel(ctlbit, base + ACCTLDIS);
 229                 break;
 230         case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
 231         case SNDRV_PCM_TRIGGER_RESUME:
 232                 __raw_writel(ctlbit, base + ACCTLEN);
 233                 break;
 234         default:
 235                 ret = -EINVAL;
 236         }
 237         spin_unlock_irqrestore(&dmadata->dma_lock, flags);
 238         return ret;
 239 }
 240
 241 static snd_pcm_uframes_t
 242 txx9aclc_pcm_pointer(struct snd_pcm_substream *substream)
 243 {
 244         struct txx9aclc_dmadata *dmadata = substream->runtime->private_data;
 245
 246         return bytes_to_frames(substream->runtime, dmadata->pos);
 247 }
 248
 249 static int txx9aclc_pcm_open(struct snd_pcm_substream *substream)
 250 {
 251         struct txx9aclc_soc_device *dev = &txx9aclc_soc_device;
 252         struct txx9aclc_dmadata *dmadata = &dev->dmadata[substream->stream];
 253         int ret;
 254
 255         ret = snd_soc_set_runtime_hwparams(substream, &txx9aclc_pcm_hardware);
 256         if (ret)
 257                 return ret;
 258         /* ensure that buffer size is a multiple of period size */
 259         ret = snd_pcm_hw_constraint_integer(substream->runtime,
 260                                             SNDRV_PCM_HW_PARAM_PERIODS);
 261         if (ret < 0)
 262                 return ret;
 263         substream->runtime->private_data = dmadata;
 264         return 0;
 265 }
 266
 267 static int txx9aclc_pcm_close(struct snd_pcm_substream *substream)
 268 {
 269         struct txx9aclc_dmadata *dmadata = substream->runtime->private_data;
 270         struct dma_chan *chan = dmadata->dma_chan;
 271
 272         dmadata->frag_count = -1;
 273         dmaengine_terminate_all(chan);
 274         return 0;
 275 }
 276
 277 static const struct snd_pcm_ops txx9aclc_pcm_ops = {
 278         .open           = txx9aclc_pcm_open,
 279         .close          = txx9aclc_pcm_close,
 280         .ioctl          = snd_pcm_lib_ioctl,
 281         .hw_params      = txx9aclc_pcm_hw_params,
 282         .hw_free        = txx9aclc_pcm_hw_free,
 283         .prepare        = txx9aclc_pcm_prepare,
 284         .trigger        = txx9aclc_pcm_trigger,
 285         .pointer        = txx9aclc_pcm_pointer,
 286 };
 287
 288 static int txx9aclc_pcm_new(struct snd_soc_pcm_runtime *rtd)
 289 {
 290         struct snd_card *card = rtd->card->snd_card;
 291         struct snd_soc_dai *dai = rtd->cpu_dai;
 292         struct snd_pcm *pcm = rtd->pcm;
 293         struct snd_soc_component *component = snd_soc_rtdcom_lookup(rtd, DRV_NAME);
 294         struct platform_device *pdev = to_platform_device(component->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_component *component)
 379 {
 380         snd_soc_component_set_drvdata(component, &txx9aclc_soc_device);
 381         return 0;
 382 }
 383
 384 static void txx9aclc_pcm_remove(struct snd_soc_component *component)
 385 {
 386         struct txx9aclc_soc_device *dev = snd_soc_component_get_drvdata(component);
 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
 400                 if (chan) {
 401                         dmadata->frag_count = -1;
 402                         dmaengine_terminate_all(chan);
 403                         dma_release_channel(chan);
 404                 }
 405                 dev->dmadata[i].dma_chan = NULL;
 406         }
 407 }
 408
 409 static const struct snd_soc_component_driver txx9aclc_soc_component = {
 410         .name           = DRV_NAME,
 411         .probe          = txx9aclc_pcm_probe,
 412         .remove         = txx9aclc_pcm_remove,
 413         .ops            = &txx9aclc_pcm_ops,
 414         .pcm_new        = txx9aclc_pcm_new,
 415 };
 416
 417 static int txx9aclc_soc_platform_probe(struct platform_device *pdev)
 418 {
 419         return devm_snd_soc_register_component(&pdev->dev,
 420                                         &txx9aclc_soc_component, NULL, 0);
 421 }
 422
 423 static struct platform_driver txx9aclc_pcm_driver = {
 424         .driver = {
 425                         .name = "txx9aclc-pcm-audio",
 426         },
 427
 428         .probe = txx9aclc_soc_platform_probe,
 429 };
 430
 431 module_platform_driver(txx9aclc_pcm_driver);
 432
 433 MODULE_AUTHOR("Atsushi Nemoto <anemo@mba.ocn.ne.jp>");
 434 MODULE_DESCRIPTION("TXx9 ACLC Audio DMA driver");
 435 MODULE_LICENSE("GPL");