sound/soc/txx9/txx9aclc.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * Generic TXx9 ACLC platform driver
   4  *
   5  * Copyright (C) 2009 Atsushi Nemoto
   6  *
   7  * Based on RBTX49xx patch from CELF patch archive.
   8  * (C) Copyright TOSHIBA CORPORATION 2004-2006
   9  */
  10
  11 #include <linux/module.h>
  12 #include <linux/init.h>
  13 #include <linux/platform_device.h>
  14 #include <linux/scatterlist.h>
  15 #include <linux/slab.h>
  16 #include <linux/dmaengine.h>
  17 #include <sound/core.h>
  18 #include <sound/pcm.h>
  19 #include <sound/pcm_params.h>
  20 #include <sound/soc.h>
  21 #include "txx9aclc.h"
  22
  23 #define DRV_NAME "txx9aclc"
  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 snd_soc_component *component = snd_soc_rtdcom_lookup(rtd, DRV_NAME);
  56         struct txx9aclc_dmadata *dmadata = runtime->private_data;
  57         int ret;
  58
  59         ret = snd_pcm_lib_malloc_pages(substream, params_buffer_bytes(params));
  60         if (ret < 0)
  61                 return ret;
  62
  63         dev_dbg(component->dev,
  64                 "runtime->dma_area = %#lx dma_addr = %#lx dma_bytes = %zd "
  65                 "runtime->min_align %ld\n",
  66                 (unsigned long)runtime->dma_area,
  67                 (unsigned long)runtime->dma_addr, runtime->dma_bytes,
  68                 runtime->min_align);
  69         dev_dbg(component->dev,
  70                 "periods %d period_bytes %d stream %d\n",
  71                 params_periods(params), params_period_bytes(params),
  72                 substream->stream);
  73
  74         dmadata->substream = substream;
  75         dmadata->pos = 0;
  76         return 0;
  77 }
  78
  79 static int txx9aclc_pcm_hw_free(struct snd_pcm_substream *substream)
  80 {
  81         return snd_pcm_lib_free_pages(substream);
  82 }
  83
  84 static int txx9aclc_pcm_prepare(struct snd_pcm_substream *substream)
  85 {
  86         struct snd_pcm_runtime *runtime = substream->runtime;
  87         struct txx9aclc_dmadata *dmadata = runtime->private_data;
  88
  89         dmadata->dma_addr = runtime->dma_addr;
  90         dmadata->buffer_bytes = snd_pcm_lib_buffer_bytes(substream);
  91         dmadata->period_bytes = snd_pcm_lib_period_bytes(substream);
  92
  93         if (dmadata->buffer_bytes == dmadata->period_bytes) {
  94                 dmadata->frag_bytes = dmadata->period_bytes >> 1;
  95                 dmadata->frags = 2;
  96         } else {
  97                 dmadata->frag_bytes = dmadata->period_bytes;
  98                 dmadata->frags = dmadata->buffer_bytes / dmadata->period_bytes;
  99         }
 100         dmadata->frag_count = 0;
 101         dmadata->pos = 0;
 102         return 0;
 103 }
 104
 105 static void txx9aclc_dma_complete(void *arg)
 106 {
 107         struct txx9aclc_dmadata *dmadata = arg;
 108         unsigned long flags;
 109
 110         /* dma completion handler cannot submit new operations */
 111         spin_lock_irqsave(&dmadata->dma_lock, flags);
 112         if (dmadata->frag_count >= 0) {
 113                 dmadata->dmacount--;
 114                 if (!WARN_ON(dmadata->dmacount < 0))
 115                         tasklet_schedule(&dmadata->tasklet);
 116         }
 117         spin_unlock_irqrestore(&dmadata->dma_lock, flags);
 118 }
 119
 120 static struct dma_async_tx_descriptor *
 121 txx9aclc_dma_submit(struct txx9aclc_dmadata *dmadata, dma_addr_t buf_dma_addr)
 122 {
 123         struct dma_chan *chan = dmadata->dma_chan;
 124         struct dma_async_tx_descriptor *desc;
 125         struct scatterlist sg;
 126
 127         sg_init_table(&sg, 1);
 128         sg_set_page(&sg, pfn_to_page(PFN_DOWN(buf_dma_addr)),
 129                     dmadata->frag_bytes, buf_dma_addr & (PAGE_SIZE - 1));
 130         sg_dma_address(&sg) = buf_dma_addr;
 131         desc = dmaengine_prep_slave_sg(chan, &sg, 1,
 132                 dmadata->substream->stream == SNDRV_PCM_STREAM_PLAYBACK ?
 133                 DMA_MEM_TO_DEV : DMA_DEV_TO_MEM,
 134                 DMA_PREP_INTERRUPT | DMA_CTRL_ACK);
 135         if (!desc) {
 136                 dev_err(&chan->dev->device, "cannot prepare slave dma\n");
 137                 return NULL;
 138         }
 139         desc->callback = txx9aclc_dma_complete;
 140         desc->callback_param = dmadata;
 141         dmaengine_submit(desc);
 142         return desc;
 143 }
 144
 145 #define NR_DMA_CHAIN            2
 146
 147 static void txx9aclc_dma_tasklet(unsigned long data)
 148 {
 149         struct txx9aclc_dmadata *dmadata = (struct txx9aclc_dmadata *)data;
 150         struct dma_chan *chan = dmadata->dma_chan;
 151         struct dma_async_tx_descriptor *desc;
 152         struct snd_pcm_substream *substream = dmadata->substream;
 153         u32 ctlbit = substream->stream == SNDRV_PCM_STREAM_PLAYBACK ?
 154                 ACCTL_AUDODMA : ACCTL_AUDIDMA;
 155         int i;
 156         unsigned long flags;
 157
 158         spin_lock_irqsave(&dmadata->dma_lock, flags);
 159         if (dmadata->frag_count < 0) {
 160                 struct txx9aclc_plat_drvdata *drvdata = txx9aclc_drvdata;
 161                 void __iomem *base = drvdata->base;
 162
 163                 spin_unlock_irqrestore(&dmadata->dma_lock, flags);
 164                 dmaengine_terminate_all(chan);
 165                 /* first time */
 166                 for (i = 0; i < NR_DMA_CHAIN; i++) {
 167                         desc = txx9aclc_dma_submit(dmadata,
 168                                 dmadata->dma_addr + i * dmadata->frag_bytes);
 169                         if (!desc)
 170                                 return;
 171                 }
 172                 dmadata->dmacount = NR_DMA_CHAIN;
 173                 dma_async_issue_pending(chan);
 174                 spin_lock_irqsave(&dmadata->dma_lock, flags);
 175                 __raw_writel(ctlbit, base + ACCTLEN);
 176                 dmadata->frag_count = NR_DMA_CHAIN % dmadata->frags;
 177                 spin_unlock_irqrestore(&dmadata->dma_lock, flags);
 178                 return;
 179         }
 180         if (WARN_ON(dmadata->dmacount >= NR_DMA_CHAIN)) {
 181                 spin_unlock_irqrestore(&dmadata->dma_lock, flags);
 182                 return;
 183         }
 184         while (dmadata->dmacount < NR_DMA_CHAIN) {
 185                 dmadata->dmacount++;
 186                 spin_unlock_irqrestore(&dmadata->dma_lock, flags);
 187                 desc = txx9aclc_dma_submit(dmadata,
 188                         dmadata->dma_addr +
 189                         dmadata->frag_count * dmadata->frag_bytes);
 190                 if (!desc)
 191                         return;
 192                 dma_async_issue_pending(chan);
 193
 194                 spin_lock_irqsave(&dmadata->dma_lock, flags);
 195                 dmadata->frag_count++;
 196                 dmadata->frag_count %= dmadata->frags;
 197                 dmadata->pos += dmadata->frag_bytes;
 198                 dmadata->pos %= dmadata->buffer_bytes;
 199                 if ((dmadata->frag_count * dmadata->frag_bytes) %
 200                     dmadata->period_bytes == 0)
 201                         snd_pcm_period_elapsed(substream);
 202         }
 203         spin_unlock_irqrestore(&dmadata->dma_lock, flags);
 204 }
 205
 206 static int txx9aclc_pcm_trigger(struct snd_pcm_substream *substream, int cmd)
 207 {
 208         struct txx9aclc_dmadata *dmadata = substream->runtime->private_data;
 209         struct txx9aclc_plat_drvdata *drvdata = txx9aclc_drvdata;
 210         void __iomem *base = drvdata->base;
 211         unsigned long flags;
 212         int ret = 0;
 213         u32 ctlbit = substream->stream == SNDRV_PCM_STREAM_PLAYBACK ?
 214                 ACCTL_AUDODMA : ACCTL_AUDIDMA;
 215
 216         spin_lock_irqsave(&dmadata->dma_lock, flags);
 217         switch (cmd) {
 218         case SNDRV_PCM_TRIGGER_START:
 219                 dmadata->frag_count = -1;
 220                 tasklet_schedule(&dmadata->tasklet);
 221                 break;
 222         case SNDRV_PCM_TRIGGER_STOP:
 223         case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
 224         case SNDRV_PCM_TRIGGER_SUSPEND:
 225                 __raw_writel(ctlbit, base + ACCTLDIS);
 226                 break;
 227         case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
 228         case SNDRV_PCM_TRIGGER_RESUME:
 229                 __raw_writel(ctlbit, base + ACCTLEN);
 230                 break;
 231         default:
 232                 ret = -EINVAL;
 233         }
 234         spin_unlock_irqrestore(&dmadata->dma_lock, flags);
 235         return ret;
 236 }
 237
 238 static snd_pcm_uframes_t
 239 txx9aclc_pcm_pointer(struct snd_pcm_substream *substream)
 240 {
 241         struct txx9aclc_dmadata *dmadata = substream->runtime->private_data;
 242
 243         return bytes_to_frames(substream->runtime, dmadata->pos);
 244 }
 245
 246 static int txx9aclc_pcm_open(struct snd_pcm_substream *substream)
 247 {
 248         struct txx9aclc_soc_device *dev = &txx9aclc_soc_device;
 249         struct txx9aclc_dmadata *dmadata = &dev->dmadata[substream->stream];
 250         int ret;
 251
 252         ret = snd_soc_set_runtime_hwparams(substream, &txx9aclc_pcm_hardware);
 253         if (ret)
 254                 return ret;
 255         /* ensure that buffer size is a multiple of period size */
 256         ret = snd_pcm_hw_constraint_integer(substream->runtime,
 257                                             SNDRV_PCM_HW_PARAM_PERIODS);
 258         if (ret < 0)
 259                 return ret;
 260         substream->runtime->private_data = dmadata;
 261         return 0;
 262 }
 263
 264 static int txx9aclc_pcm_close(struct snd_pcm_substream *substream)
 265 {
 266         struct txx9aclc_dmadata *dmadata = substream->runtime->private_data;
 267         struct dma_chan *chan = dmadata->dma_chan;
 268
 269         dmadata->frag_count = -1;
 270         dmaengine_terminate_all(chan);
 271         return 0;
 272 }
 273
 274 static const struct snd_pcm_ops txx9aclc_pcm_ops = {
 275         .open           = txx9aclc_pcm_open,
 276         .close          = txx9aclc_pcm_close,
 277         .ioctl          = snd_pcm_lib_ioctl,
 278         .hw_params      = txx9aclc_pcm_hw_params,
 279         .hw_free        = txx9aclc_pcm_hw_free,
 280         .prepare        = txx9aclc_pcm_prepare,
 281         .trigger        = txx9aclc_pcm_trigger,
 282         .pointer        = txx9aclc_pcm_pointer,
 283 };
 284
 285 static int txx9aclc_pcm_new(struct snd_soc_pcm_runtime *rtd)
 286 {
 287         struct snd_card *card = rtd->card->snd_card;
 288         struct snd_soc_dai *dai = rtd->cpu_dai;
 289         struct snd_pcm *pcm = rtd->pcm;
 290         struct snd_soc_component *component = snd_soc_rtdcom_lookup(rtd, DRV_NAME);
 291         struct platform_device *pdev = to_platform_device(component->dev);
 292         struct txx9aclc_soc_device *dev;
 293         struct resource *r;
 294         int i;
 295         int ret;
 296
 297         /* at this point onwards the AC97 component has probed and this will be valid */
 298         dev = snd_soc_dai_get_drvdata(dai);
 299
 300         dev->dmadata[0].stream = SNDRV_PCM_STREAM_PLAYBACK;
 301         dev->dmadata[1].stream = SNDRV_PCM_STREAM_CAPTURE;
 302         for (i = 0; i < 2; i++) {
 303                 r = platform_get_resource(pdev, IORESOURCE_DMA, i);
 304                 if (!r) {
 305                         ret = -EBUSY;
 306                         goto exit;
 307                 }
 308                 dev->dmadata[i].dma_res = r;
 309                 ret = txx9aclc_dma_init(dev, &dev->dmadata[i]);
 310                 if (ret)
 311                         goto exit;
 312         }
 313
 314         snd_pcm_lib_preallocate_pages_for_all(pcm, SNDRV_DMA_TYPE_DEV,
 315                 card->dev, 64 * 1024, 4 * 1024 * 1024);
 316         return 0;
 317
 318 exit:
 319         for (i = 0; i < 2; i++) {
 320                 if (dev->dmadata[i].dma_chan)
 321                         dma_release_channel(dev->dmadata[i].dma_chan);
 322                 dev->dmadata[i].dma_chan = NULL;
 323         }
 324         return ret;
 325 }
 326
 327 static bool filter(struct dma_chan *chan, void *param)
 328 {
 329         struct txx9aclc_dmadata *dmadata = param;
 330         char *devname;
 331         bool found = false;
 332
 333         devname = kasprintf(GFP_KERNEL, "%s.%d", dmadata->dma_res->name,
 334                 (int)dmadata->dma_res->start);
 335         if (strcmp(dev_name(chan->device->dev), devname) == 0) {
 336                 chan->private = &dmadata->dma_slave;
 337                 found = true;
 338         }
 339         kfree(devname);
 340         return found;
 341 }
 342
 343 static int txx9aclc_dma_init(struct txx9aclc_soc_device *dev,
 344                              struct txx9aclc_dmadata *dmadata)
 345 {
 346         struct txx9aclc_plat_drvdata *drvdata = txx9aclc_drvdata;
 347         struct txx9dmac_slave *ds = &dmadata->dma_slave;
 348         dma_cap_mask_t mask;
 349
 350         spin_lock_init(&dmadata->dma_lock);
 351
 352         ds->reg_width = sizeof(u32);
 353         if (dmadata->stream == SNDRV_PCM_STREAM_PLAYBACK) {
 354                 ds->tx_reg = drvdata->physbase + ACAUDODAT;
 355                 ds->rx_reg = 0;
 356         } else {
 357                 ds->tx_reg = 0;
 358                 ds->rx_reg = drvdata->physbase + ACAUDIDAT;
 359         }
 360
 361         /* Try to grab a DMA channel */
 362         dma_cap_zero(mask);
 363         dma_cap_set(DMA_SLAVE, mask);
 364         dmadata->dma_chan = dma_request_channel(mask, filter, dmadata);
 365         if (!dmadata->dma_chan) {
 366                 printk(KERN_ERR
 367                         "DMA channel for %s is not available\n",
 368                         dmadata->stream == SNDRV_PCM_STREAM_PLAYBACK ?
 369                         "playback" : "capture");
 370                 return -EBUSY;
 371         }
 372         tasklet_init(&dmadata->tasklet, txx9aclc_dma_tasklet,
 373                      (unsigned long)dmadata);
 374         return 0;
 375 }
 376
 377 static int txx9aclc_pcm_probe(struct snd_soc_component *component)
 378 {
 379         snd_soc_component_set_drvdata(component, &txx9aclc_soc_device);
 380         return 0;
 381 }
 382
 383 static void txx9aclc_pcm_remove(struct snd_soc_component *component)
 384 {
 385         struct txx9aclc_soc_device *dev = snd_soc_component_get_drvdata(component);
 386         struct txx9aclc_plat_drvdata *drvdata = txx9aclc_drvdata;
 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
 399                 if (chan) {
 400                         dmadata->frag_count = -1;
 401                         dmaengine_terminate_all(chan);
 402                         dma_release_channel(chan);
 403                 }
 404                 dev->dmadata[i].dma_chan = NULL;
 405         }
 406 }
 407
 408 static const struct snd_soc_component_driver txx9aclc_soc_component = {
 409         .name           = DRV_NAME,
 410         .probe          = txx9aclc_pcm_probe,
 411         .remove         = txx9aclc_pcm_remove,
 412         .ops            = &txx9aclc_pcm_ops,
 413         .pcm_new        = txx9aclc_pcm_new,
 414 };
 415
 416 static int txx9aclc_soc_platform_probe(struct platform_device *pdev)
 417 {
 418         return devm_snd_soc_register_component(&pdev->dev,
 419                                         &txx9aclc_soc_component, NULL, 0);
 420 }
 421
 422 static struct platform_driver txx9aclc_pcm_driver = {
 423         .driver = {
 424                         .name = "txx9aclc-pcm-audio",
 425         },
 426
 427         .probe = txx9aclc_soc_platform_probe,
 428 };
 429
 430 module_platform_driver(txx9aclc_pcm_driver);
 431
 432 MODULE_AUTHOR("Atsushi Nemoto <anemo@mba.ocn.ne.jp>");
 433 MODULE_DESCRIPTION("TXx9 ACLC Audio DMA driver");
 434 MODULE_LICENSE("GPL");