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_soc_component *component,
  51                                   struct snd_pcm_substream *substream,
  52                                   struct snd_pcm_hw_params *params)
  53 {
  54         struct snd_pcm_runtime *runtime = substream->runtime;
  55         struct txx9aclc_dmadata *dmadata = runtime->private_data;
  56
  57         dev_dbg(component->dev,
  58                 "runtime->dma_area = %#lx dma_addr = %#lx dma_bytes = %zd "
  59                 "runtime->min_align %ld\n",
  60                 (unsigned long)runtime->dma_area,
  61                 (unsigned long)runtime->dma_addr, runtime->dma_bytes,
  62                 runtime->min_align);
  63         dev_dbg(component->dev,
  64                 "periods %d period_bytes %d stream %d\n",
  65                 params_periods(params), params_period_bytes(params),
  66                 substream->stream);
  67
  68         dmadata->substream = substream;
  69         dmadata->pos = 0;
  70         return 0;
  71 }
  72
  73 static int txx9aclc_pcm_prepare(struct snd_soc_component *component,
  74                                 struct snd_pcm_substream *substream)
  75 {
  76         struct snd_pcm_runtime *runtime = substream->runtime;
  77         struct txx9aclc_dmadata *dmadata = runtime->private_data;
  78
  79         dmadata->dma_addr = runtime->dma_addr;
  80         dmadata->buffer_bytes = snd_pcm_lib_buffer_bytes(substream);
  81         dmadata->period_bytes = snd_pcm_lib_period_bytes(substream);
  82
  83         if (dmadata->buffer_bytes == dmadata->period_bytes) {
  84                 dmadata->frag_bytes = dmadata->period_bytes >> 1;
  85                 dmadata->frags = 2;
  86         } else {
  87                 dmadata->frag_bytes = dmadata->period_bytes;
  88                 dmadata->frags = dmadata->buffer_bytes / dmadata->period_bytes;
  89         }
  90         dmadata->frag_count = 0;
  91         dmadata->pos = 0;
  92         return 0;
  93 }
  94
  95 static void txx9aclc_dma_complete(void *arg)
  96 {
  97         struct txx9aclc_dmadata *dmadata = arg;
  98         unsigned long flags;
  99
 100         /* dma completion handler cannot submit new operations */
 101         spin_lock_irqsave(&dmadata->dma_lock, flags);
 102         if (dmadata->frag_count >= 0) {
 103                 dmadata->dmacount--;
 104                 if (!WARN_ON(dmadata->dmacount < 0))
 105                         tasklet_schedule(&dmadata->tasklet);
 106         }
 107         spin_unlock_irqrestore(&dmadata->dma_lock, flags);
 108 }
 109
 110 static struct dma_async_tx_descriptor *
 111 txx9aclc_dma_submit(struct txx9aclc_dmadata *dmadata, dma_addr_t buf_dma_addr)
 112 {
 113         struct dma_chan *chan = dmadata->dma_chan;
 114         struct dma_async_tx_descriptor *desc;
 115         struct scatterlist sg;
 116
 117         sg_init_table(&sg, 1);
 118         sg_set_page(&sg, pfn_to_page(PFN_DOWN(buf_dma_addr)),
 119                     dmadata->frag_bytes, buf_dma_addr & (PAGE_SIZE - 1));
 120         sg_dma_address(&sg) = buf_dma_addr;
 121         desc = dmaengine_prep_slave_sg(chan, &sg, 1,
 122                 dmadata->substream->stream == SNDRV_PCM_STREAM_PLAYBACK ?
 123                 DMA_MEM_TO_DEV : DMA_DEV_TO_MEM,
 124                 DMA_PREP_INTERRUPT | DMA_CTRL_ACK);
 125         if (!desc) {
 126                 dev_err(&chan->dev->device, "cannot prepare slave dma\n");
 127                 return NULL;
 128         }
 129         desc->callback = txx9aclc_dma_complete;
 130         desc->callback_param = dmadata;
 131         dmaengine_submit(desc);
 132         return desc;
 133 }
 134
 135 #define NR_DMA_CHAIN            2
 136
 137 static void txx9aclc_dma_tasklet(unsigned long data)
 138 {
 139         struct txx9aclc_dmadata *dmadata = (struct txx9aclc_dmadata *)data;
 140         struct dma_chan *chan = dmadata->dma_chan;
 141         struct dma_async_tx_descriptor *desc;
 142         struct snd_pcm_substream *substream = dmadata->substream;
 143         u32 ctlbit = substream->stream == SNDRV_PCM_STREAM_PLAYBACK ?
 144                 ACCTL_AUDODMA : ACCTL_AUDIDMA;
 145         int i;
 146         unsigned long flags;
 147
 148         spin_lock_irqsave(&dmadata->dma_lock, flags);
 149         if (dmadata->frag_count < 0) {
 150                 struct txx9aclc_plat_drvdata *drvdata = txx9aclc_drvdata;
 151                 void __iomem *base = drvdata->base;
 152
 153                 spin_unlock_irqrestore(&dmadata->dma_lock, flags);
 154                 dmaengine_terminate_all(chan);
 155                 /* first time */
 156                 for (i = 0; i < NR_DMA_CHAIN; i++) {
 157                         desc = txx9aclc_dma_submit(dmadata,
 158                                 dmadata->dma_addr + i * dmadata->frag_bytes);
 159                         if (!desc)
 160                                 return;
 161                 }
 162                 dmadata->dmacount = NR_DMA_CHAIN;
 163                 dma_async_issue_pending(chan);
 164                 spin_lock_irqsave(&dmadata->dma_lock, flags);
 165                 __raw_writel(ctlbit, base + ACCTLEN);
 166                 dmadata->frag_count = NR_DMA_CHAIN % dmadata->frags;
 167                 spin_unlock_irqrestore(&dmadata->dma_lock, flags);
 168                 return;
 169         }
 170         if (WARN_ON(dmadata->dmacount >= NR_DMA_CHAIN)) {
 171                 spin_unlock_irqrestore(&dmadata->dma_lock, flags);
 172                 return;
 173         }
 174         while (dmadata->dmacount < NR_DMA_CHAIN) {
 175                 dmadata->dmacount++;
 176                 spin_unlock_irqrestore(&dmadata->dma_lock, flags);
 177                 desc = txx9aclc_dma_submit(dmadata,
 178                         dmadata->dma_addr +
 179                         dmadata->frag_count * dmadata->frag_bytes);
 180                 if (!desc)
 181                         return;
 182                 dma_async_issue_pending(chan);
 183
 184                 spin_lock_irqsave(&dmadata->dma_lock, flags);
 185                 dmadata->frag_count++;
 186                 dmadata->frag_count %= dmadata->frags;
 187                 dmadata->pos += dmadata->frag_bytes;
 188                 dmadata->pos %= dmadata->buffer_bytes;
 189                 if ((dmadata->frag_count * dmadata->frag_bytes) %
 190                     dmadata->period_bytes == 0)
 191                         snd_pcm_period_elapsed(substream);
 192         }
 193         spin_unlock_irqrestore(&dmadata->dma_lock, flags);
 194 }
 195
 196 static int txx9aclc_pcm_trigger(struct snd_soc_component *component,
 197                                 struct snd_pcm_substream *substream, int cmd)
 198 {
 199         struct txx9aclc_dmadata *dmadata = substream->runtime->private_data;
 200         struct txx9aclc_plat_drvdata *drvdata = txx9aclc_drvdata;
 201         void __iomem *base = drvdata->base;
 202         unsigned long flags;
 203         int ret = 0;
 204         u32 ctlbit = substream->stream == SNDRV_PCM_STREAM_PLAYBACK ?
 205                 ACCTL_AUDODMA : ACCTL_AUDIDMA;
 206
 207         spin_lock_irqsave(&dmadata->dma_lock, flags);
 208         switch (cmd) {
 209         case SNDRV_PCM_TRIGGER_START:
 210                 dmadata->frag_count = -1;
 211                 tasklet_schedule(&dmadata->tasklet);
 212                 break;
 213         case SNDRV_PCM_TRIGGER_STOP:
 214         case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
 215         case SNDRV_PCM_TRIGGER_SUSPEND:
 216                 __raw_writel(ctlbit, base + ACCTLDIS);
 217                 break;
 218         case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
 219         case SNDRV_PCM_TRIGGER_RESUME:
 220                 __raw_writel(ctlbit, base + ACCTLEN);
 221                 break;
 222         default:
 223                 ret = -EINVAL;
 224         }
 225         spin_unlock_irqrestore(&dmadata->dma_lock, flags);
 226         return ret;
 227 }
 228
 229 static snd_pcm_uframes_t
 230 txx9aclc_pcm_pointer(struct snd_soc_component *component,
 231                      struct snd_pcm_substream *substream)
 232 {
 233         struct txx9aclc_dmadata *dmadata = substream->runtime->private_data;
 234
 235         return bytes_to_frames(substream->runtime, dmadata->pos);
 236 }
 237
 238 static int txx9aclc_pcm_open(struct snd_soc_component *component,
 239                              struct snd_pcm_substream *substream)
 240 {
 241         struct txx9aclc_soc_device *dev = &txx9aclc_soc_device;
 242         struct txx9aclc_dmadata *dmadata = &dev->dmadata[substream->stream];
 243         int ret;
 244
 245         ret = snd_soc_set_runtime_hwparams(substream, &txx9aclc_pcm_hardware);
 246         if (ret)
 247                 return ret;
 248         /* ensure that buffer size is a multiple of period size */
 249         ret = snd_pcm_hw_constraint_integer(substream->runtime,
 250                                             SNDRV_PCM_HW_PARAM_PERIODS);
 251         if (ret < 0)
 252                 return ret;
 253         substream->runtime->private_data = dmadata;
 254         return 0;
 255 }
 256
 257 static int txx9aclc_pcm_close(struct snd_soc_component *component,
 258                               struct snd_pcm_substream *substream)
 259 {
 260         struct txx9aclc_dmadata *dmadata = substream->runtime->private_data;
 261         struct dma_chan *chan = dmadata->dma_chan;
 262
 263         dmadata->frag_count = -1;
 264         dmaengine_terminate_all(chan);
 265         return 0;
 266 }
 267
 268 static int txx9aclc_pcm_new(struct snd_soc_component *component,
 269                             struct snd_soc_pcm_runtime *rtd)
 270 {
 271         struct snd_card *card = rtd->card->snd_card;
 272         struct snd_soc_dai *dai = rtd->cpu_dai;
 273         struct snd_pcm *pcm = rtd->pcm;
 274         struct platform_device *pdev = to_platform_device(component->dev);
 275         struct txx9aclc_soc_device *dev;
 276         struct resource *r;
 277         int i;
 278         int ret;
 279
 280         /* at this point onwards the AC97 component has probed and this will be valid */
 281         dev = snd_soc_dai_get_drvdata(dai);
 282
 283         dev->dmadata[0].stream = SNDRV_PCM_STREAM_PLAYBACK;
 284         dev->dmadata[1].stream = SNDRV_PCM_STREAM_CAPTURE;
 285         for (i = 0; i < 2; i++) {
 286                 r = platform_get_resource(pdev, IORESOURCE_DMA, i);
 287                 if (!r) {
 288                         ret = -EBUSY;
 289                         goto exit;
 290                 }
 291                 dev->dmadata[i].dma_res = r;
 292                 ret = txx9aclc_dma_init(dev, &dev->dmadata[i]);
 293                 if (ret)
 294                         goto exit;
 295         }
 296
 297         snd_pcm_set_managed_buffer_all(pcm, SNDRV_DMA_TYPE_DEV,
 298                 card->dev, 64 * 1024, 4 * 1024 * 1024);
 299         return 0;
 300
 301 exit:
 302         for (i = 0; i < 2; i++) {
 303                 if (dev->dmadata[i].dma_chan)
 304                         dma_release_channel(dev->dmadata[i].dma_chan);
 305                 dev->dmadata[i].dma_chan = NULL;
 306         }
 307         return ret;
 308 }
 309
 310 static bool filter(struct dma_chan *chan, void *param)
 311 {
 312         struct txx9aclc_dmadata *dmadata = param;
 313         char *devname;
 314         bool found = false;
 315
 316         devname = kasprintf(GFP_KERNEL, "%s.%d", dmadata->dma_res->name,
 317                 (int)dmadata->dma_res->start);
 318         if (strcmp(dev_name(chan->device->dev), devname) == 0) {
 319                 chan->private = &dmadata->dma_slave;
 320                 found = true;
 321         }
 322         kfree(devname);
 323         return found;
 324 }
 325
 326 static int txx9aclc_dma_init(struct txx9aclc_soc_device *dev,
 327                              struct txx9aclc_dmadata *dmadata)
 328 {
 329         struct txx9aclc_plat_drvdata *drvdata = txx9aclc_drvdata;
 330         struct txx9dmac_slave *ds = &dmadata->dma_slave;
 331         dma_cap_mask_t mask;
 332
 333         spin_lock_init(&dmadata->dma_lock);
 334
 335         ds->reg_width = sizeof(u32);
 336         if (dmadata->stream == SNDRV_PCM_STREAM_PLAYBACK) {
 337                 ds->tx_reg = drvdata->physbase + ACAUDODAT;
 338                 ds->rx_reg = 0;
 339         } else {
 340                 ds->tx_reg = 0;
 341                 ds->rx_reg = drvdata->physbase + ACAUDIDAT;
 342         }
 343
 344         /* Try to grab a DMA channel */
 345         dma_cap_zero(mask);
 346         dma_cap_set(DMA_SLAVE, mask);
 347         dmadata->dma_chan = dma_request_channel(mask, filter, dmadata);
 348         if (!dmadata->dma_chan) {
 349                 printk(KERN_ERR
 350                         "DMA channel for %s is not available\n",
 351                         dmadata->stream == SNDRV_PCM_STREAM_PLAYBACK ?
 352                         "playback" : "capture");
 353                 return -EBUSY;
 354         }
 355         tasklet_init(&dmadata->tasklet, txx9aclc_dma_tasklet,
 356                      (unsigned long)dmadata);
 357         return 0;
 358 }
 359
 360 static int txx9aclc_pcm_probe(struct snd_soc_component *component)
 361 {
 362         snd_soc_component_set_drvdata(component, &txx9aclc_soc_device);
 363         return 0;
 364 }
 365
 366 static void txx9aclc_pcm_remove(struct snd_soc_component *component)
 367 {
 368         struct txx9aclc_soc_device *dev = snd_soc_component_get_drvdata(component);
 369         struct txx9aclc_plat_drvdata *drvdata = txx9aclc_drvdata;
 370         void __iomem *base = drvdata->base;
 371         int i;
 372
 373         /* disable all FIFO DMAs */
 374         __raw_writel(ACCTL_AUDODMA | ACCTL_AUDIDMA, base + ACCTLDIS);
 375         /* dummy R/W to clear pending DMAREQ if any */
 376         __raw_writel(__raw_readl(base + ACAUDIDAT), base + ACAUDODAT);
 377
 378         for (i = 0; i < 2; i++) {
 379                 struct txx9aclc_dmadata *dmadata = &dev->dmadata[i];
 380                 struct dma_chan *chan = dmadata->dma_chan;
 381
 382                 if (chan) {
 383                         dmadata->frag_count = -1;
 384                         dmaengine_terminate_all(chan);
 385                         dma_release_channel(chan);
 386                 }
 387                 dev->dmadata[i].dma_chan = NULL;
 388         }
 389 }
 390
 391 static const struct snd_soc_component_driver txx9aclc_soc_component = {
 392         .name           = DRV_NAME,
 393         .probe          = txx9aclc_pcm_probe,
 394         .remove         = txx9aclc_pcm_remove,
 395         .open           = txx9aclc_pcm_open,
 396         .close          = txx9aclc_pcm_close,
 397         .hw_params      = txx9aclc_pcm_hw_params,
 398         .prepare        = txx9aclc_pcm_prepare,
 399         .trigger        = txx9aclc_pcm_trigger,
 400         .pointer        = txx9aclc_pcm_pointer,
 401         .pcm_construct  = txx9aclc_pcm_new,
 402 };
 403
 404 static int txx9aclc_soc_platform_probe(struct platform_device *pdev)
 405 {
 406         return devm_snd_soc_register_component(&pdev->dev,
 407                                         &txx9aclc_soc_component, NULL, 0);
 408 }
 409
 410 static struct platform_driver txx9aclc_pcm_driver = {
 411         .driver = {
 412                         .name = "txx9aclc-pcm-audio",
 413         },
 414
 415         .probe = txx9aclc_soc_platform_probe,
 416 };
 417
 418 module_platform_driver(txx9aclc_pcm_driver);
 419
 420 MODULE_AUTHOR("Atsushi Nemoto <anemo@mba.ocn.ne.jp>");
 421 MODULE_DESCRIPTION("TXx9 ACLC Audio DMA driver");
 422 MODULE_LICENSE("GPL");