release/src-rt-6.x.4708/linux/linux-2.6.36/sound/soc/au1x/dbdma2.c

   1 /*
   2  * Au12x0/Au1550 PSC ALSA ASoC audio support.
   3  *
   4  * (c) 2007-2008 MSC Vertriebsges.m.b.H.,
   5  *      Manuel Lauss <manuel.lauss@gmail.com>
   6  *
   7  * This program is free software; you can redistribute it and/or modify
   8  * it under the terms of the GNU General Public License version 2 as
   9  * published by the Free Software Foundation.
  10  *
  11  * DMA glue for Au1x-PSC audio.
  12  *
  13  * NOTE: all of these drivers can only work with a SINGLE instance
  14  *       of a PSC. Multiple independent audio devices are impossible
  15  *       with ASoC v1.
  16  */
  17
  18
  19 #include <linux/module.h>
  20 #include <linux/init.h>
  21 #include <linux/platform_device.h>
  22 #include <linux/slab.h>
  23 #include <linux/dma-mapping.h>
  24
  25 #include <sound/core.h>
  26 #include <sound/pcm.h>
  27 #include <sound/pcm_params.h>
  28 #include <sound/soc.h>
  29
  30 #include <asm/mach-au1x00/au1000.h>
  31 #include <asm/mach-au1x00/au1xxx_dbdma.h>
  32 #include <asm/mach-au1x00/au1xxx_psc.h>
  33
  34 #include "psc.h"
  35
  36 /*#define PCM_DEBUG*/
  37
  38 #define MSG(x...)       printk(KERN_INFO "au1xpsc_pcm: " x)
  39 #ifdef PCM_DEBUG
  40 #define DBG             MSG
  41 #else
  42 #define DBG(x...)       do {} while (0)
  43 #endif
  44
  45 struct au1xpsc_audio_dmadata {
  46         /* DDMA control data */
  47         unsigned int ddma_id;           /* DDMA direction ID for this PSC */
  48         u32 ddma_chan;                  /* DDMA context */
  49
  50         /* PCM context (for irq handlers) */
  51         struct snd_pcm_substream *substream;
  52         unsigned long curr_period;      /* current segment DDMA is working on */
  53         unsigned long q_period;         /* queue period(s) */
  54         dma_addr_t dma_area;            /* address of queued DMA area */
  55         dma_addr_t dma_area_s;          /* start address of DMA area */
  56         unsigned long pos;              /* current byte position being played */
  57         unsigned long periods;          /* number of SG segments in total */
  58         unsigned long period_bytes;     /* size in bytes of one SG segment */
  59
  60         /* runtime data */
  61         int msbits;
  62 };
  63
  64 /* instance data. There can be only one, MacLeod!!!! */
  65 static struct au1xpsc_audio_dmadata *au1xpsc_audio_pcmdma[2];
  66
  67 /*
  68  * These settings are somewhat okay, at least on my machine audio plays
  69  * almost skip-free. Especially the 64kB buffer seems to help a LOT.
  70  */
  71 #define AU1XPSC_PERIOD_MIN_BYTES        1024
  72 #define AU1XPSC_BUFFER_MIN_BYTES        65536
  73
  74 #define AU1XPSC_PCM_FMTS                                        \
  75         (SNDRV_PCM_FMTBIT_S8     | SNDRV_PCM_FMTBIT_U8 |        \
  76          SNDRV_PCM_FMTBIT_S16_LE | SNDRV_PCM_FMTBIT_S16_BE |    \
  77          SNDRV_PCM_FMTBIT_U16_LE | SNDRV_PCM_FMTBIT_U16_BE |    \
  78          SNDRV_PCM_FMTBIT_S32_LE | SNDRV_PCM_FMTBIT_S32_BE |    \
  79          SNDRV_PCM_FMTBIT_U32_LE | SNDRV_PCM_FMTBIT_U32_BE |    \
  80          0)
  81
  82 /* PCM hardware DMA capabilities - platform specific */
  83 static const struct snd_pcm_hardware au1xpsc_pcm_hardware = {
  84         .info             = SNDRV_PCM_INFO_MMAP | SNDRV_PCM_INFO_MMAP_VALID |
  85                             SNDRV_PCM_INFO_INTERLEAVED | SNDRV_PCM_INFO_BATCH,
  86         .formats          = AU1XPSC_PCM_FMTS,
  87         .period_bytes_min = AU1XPSC_PERIOD_MIN_BYTES,
  88         .period_bytes_max = 4096 * 1024 - 1,
  89         .periods_min      = 2,
  90         .periods_max      = 4096,       /* 2 to as-much-as-you-like */
  91         .buffer_bytes_max = 4096 * 1024 - 1,
  92         .fifo_size        = 16,         /* fifo entries of AC97/I2S PSC */
  93 };
  94
  95 static void au1x_pcm_queue_tx(struct au1xpsc_audio_dmadata *cd)
  96 {
  97         au1xxx_dbdma_put_source(cd->ddma_chan, cd->dma_area,
  98                                 cd->period_bytes, DDMA_FLAGS_IE);
  99
 100         /* update next-to-queue period */
 101         ++cd->q_period;
 102         cd->dma_area += cd->period_bytes;
 103         if (cd->q_period >= cd->periods) {
 104                 cd->q_period = 0;
 105                 cd->dma_area = cd->dma_area_s;
 106         }
 107 }
 108
 109 static void au1x_pcm_queue_rx(struct au1xpsc_audio_dmadata *cd)
 110 {
 111         au1xxx_dbdma_put_dest(cd->ddma_chan, cd->dma_area,
 112                               cd->period_bytes, DDMA_FLAGS_IE);
 113
 114         /* update next-to-queue period */
 115         ++cd->q_period;
 116         cd->dma_area += cd->period_bytes;
 117         if (cd->q_period >= cd->periods) {
 118                 cd->q_period = 0;
 119                 cd->dma_area = cd->dma_area_s;
 120         }
 121 }
 122
 123 static void au1x_pcm_dmatx_cb(int irq, void *dev_id)
 124 {
 125         struct au1xpsc_audio_dmadata *cd = dev_id;
 126
 127         cd->pos += cd->period_bytes;
 128         if (++cd->curr_period >= cd->periods) {
 129                 cd->pos = 0;
 130                 cd->curr_period = 0;
 131         }
 132         snd_pcm_period_elapsed(cd->substream);
 133         au1x_pcm_queue_tx(cd);
 134 }
 135
 136 static void au1x_pcm_dmarx_cb(int irq, void *dev_id)
 137 {
 138         struct au1xpsc_audio_dmadata *cd = dev_id;
 139
 140         cd->pos += cd->period_bytes;
 141         if (++cd->curr_period >= cd->periods) {
 142                 cd->pos = 0;
 143                 cd->curr_period = 0;
 144         }
 145         snd_pcm_period_elapsed(cd->substream);
 146         au1x_pcm_queue_rx(cd);
 147 }
 148
 149 static void au1x_pcm_dbdma_free(struct au1xpsc_audio_dmadata *pcd)
 150 {
 151         if (pcd->ddma_chan) {
 152                 au1xxx_dbdma_stop(pcd->ddma_chan);
 153                 au1xxx_dbdma_reset(pcd->ddma_chan);
 154                 au1xxx_dbdma_chan_free(pcd->ddma_chan);
 155                 pcd->ddma_chan = 0;
 156                 pcd->msbits = 0;
 157         }
 158 }
 159
 160 /* in case of missing DMA ring or changed TX-source / RX-dest bit widths,
 161  * allocate (or reallocate) a 2-descriptor DMA ring with bit depth according
 162  * to ALSA-supplied sample depth.  This is due to limitations in the dbdma api
 163  * (cannot adjust source/dest widths of already allocated descriptor ring).
 164  */
 165 static int au1x_pcm_dbdma_realloc(struct au1xpsc_audio_dmadata *pcd,
 166                                  int stype, int msbits)
 167 {
 168         /* DMA only in 8/16/32 bit widths */
 169         if (msbits == 24)
 170                 msbits = 32;
 171
 172         /* check current config: correct bits and descriptors allocated? */
 173         if ((pcd->ddma_chan) && (msbits == pcd->msbits))
 174                 goto out;       /* all ok! */
 175
 176         au1x_pcm_dbdma_free(pcd);
 177
 178         if (stype == PCM_RX)
 179                 pcd->ddma_chan = au1xxx_dbdma_chan_alloc(pcd->ddma_id,
 180                                         DSCR_CMD0_ALWAYS,
 181                                         au1x_pcm_dmarx_cb, (void *)pcd);
 182         else
 183                 pcd->ddma_chan = au1xxx_dbdma_chan_alloc(DSCR_CMD0_ALWAYS,
 184                                         pcd->ddma_id,
 185                                         au1x_pcm_dmatx_cb, (void *)pcd);
 186
 187         if (!pcd->ddma_chan)
 188                 return -ENOMEM;
 189
 190         au1xxx_dbdma_set_devwidth(pcd->ddma_chan, msbits);
 191         au1xxx_dbdma_ring_alloc(pcd->ddma_chan, 2);
 192
 193         pcd->msbits = msbits;
 194
 195         au1xxx_dbdma_stop(pcd->ddma_chan);
 196         au1xxx_dbdma_reset(pcd->ddma_chan);
 197
 198 out:
 199         return 0;
 200 }
 201
 202 static int au1xpsc_pcm_hw_params(struct snd_pcm_substream *substream,
 203                                  struct snd_pcm_hw_params *params)
 204 {
 205         struct snd_pcm_runtime *runtime = substream->runtime;
 206         struct au1xpsc_audio_dmadata *pcd;
 207         int stype, ret;
 208
 209         ret = snd_pcm_lib_malloc_pages(substream, params_buffer_bytes(params));
 210         if (ret < 0)
 211                 goto out;
 212
 213         stype = SUBSTREAM_TYPE(substream);
 214         pcd = au1xpsc_audio_pcmdma[stype];
 215
 216         DBG("runtime->dma_area = 0x%08lx dma_addr_t = 0x%08lx dma_size = %d "
 217             "runtime->min_align %d\n",
 218                 (unsigned long)runtime->dma_area,
 219                 (unsigned long)runtime->dma_addr, runtime->dma_bytes,
 220                 runtime->min_align);
 221
 222         DBG("bits %d  frags %d  frag_bytes %d  is_rx %d\n", params->msbits,
 223                 params_periods(params), params_period_bytes(params), stype);
 224
 225         ret = au1x_pcm_dbdma_realloc(pcd, stype, params->msbits);
 226         if (ret) {
 227                 MSG("DDMA channel (re)alloc failed!\n");
 228                 goto out;
 229         }
 230
 231         pcd->substream = substream;
 232         pcd->period_bytes = params_period_bytes(params);
 233         pcd->periods = params_periods(params);
 234         pcd->dma_area_s = pcd->dma_area = runtime->dma_addr;
 235         pcd->q_period = 0;
 236         pcd->curr_period = 0;
 237         pcd->pos = 0;
 238
 239         ret = 0;
 240 out:
 241         return ret;
 242 }
 243
 244 static int au1xpsc_pcm_hw_free(struct snd_pcm_substream *substream)
 245 {
 246         snd_pcm_lib_free_pages(substream);
 247         return 0;
 248 }
 249
 250 static int au1xpsc_pcm_prepare(struct snd_pcm_substream *substream)
 251 {
 252         struct au1xpsc_audio_dmadata *pcd =
 253                         au1xpsc_audio_pcmdma[SUBSTREAM_TYPE(substream)];
 254
 255         au1xxx_dbdma_reset(pcd->ddma_chan);
 256
 257         if (SUBSTREAM_TYPE(substream) == PCM_RX) {
 258                 au1x_pcm_queue_rx(pcd);
 259                 au1x_pcm_queue_rx(pcd);
 260         } else {
 261                 au1x_pcm_queue_tx(pcd);
 262                 au1x_pcm_queue_tx(pcd);
 263         }
 264
 265         return 0;
 266 }
 267
 268 static int au1xpsc_pcm_trigger(struct snd_pcm_substream *substream, int cmd)
 269 {
 270         u32 c = au1xpsc_audio_pcmdma[SUBSTREAM_TYPE(substream)]->ddma_chan;
 271
 272         switch (cmd) {
 273         case SNDRV_PCM_TRIGGER_START:
 274         case SNDRV_PCM_TRIGGER_RESUME:
 275                 au1xxx_dbdma_start(c);
 276                 break;
 277         case SNDRV_PCM_TRIGGER_STOP:
 278         case SNDRV_PCM_TRIGGER_SUSPEND:
 279                 au1xxx_dbdma_stop(c);
 280                 break;
 281         default:
 282                 return -EINVAL;
 283         }
 284         return 0;
 285 }
 286
 287 static snd_pcm_uframes_t
 288 au1xpsc_pcm_pointer(struct snd_pcm_substream *substream)
 289 {
 290         return bytes_to_frames(substream->runtime,
 291                 au1xpsc_audio_pcmdma[SUBSTREAM_TYPE(substream)]->pos);
 292 }
 293
 294 static int au1xpsc_pcm_open(struct snd_pcm_substream *substream)
 295 {
 296         snd_soc_set_runtime_hwparams(substream, &au1xpsc_pcm_hardware);
 297         return 0;
 298 }
 299
 300 static int au1xpsc_pcm_close(struct snd_pcm_substream *substream)
 301 {
 302         au1x_pcm_dbdma_free(au1xpsc_audio_pcmdma[SUBSTREAM_TYPE(substream)]);
 303         return 0;
 304 }
 305
 306 static struct snd_pcm_ops au1xpsc_pcm_ops = {
 307         .open           = au1xpsc_pcm_open,
 308         .close          = au1xpsc_pcm_close,
 309         .ioctl          = snd_pcm_lib_ioctl,
 310         .hw_params      = au1xpsc_pcm_hw_params,
 311         .hw_free        = au1xpsc_pcm_hw_free,
 312         .prepare        = au1xpsc_pcm_prepare,
 313         .trigger        = au1xpsc_pcm_trigger,
 314         .pointer        = au1xpsc_pcm_pointer,
 315 };
 316
 317 static void au1xpsc_pcm_free_dma_buffers(struct snd_pcm *pcm)
 318 {
 319         snd_pcm_lib_preallocate_free_for_all(pcm);
 320 }
 321
 322 static int au1xpsc_pcm_new(struct snd_card *card,
 323                            struct snd_soc_dai *dai,
 324                            struct snd_pcm *pcm)
 325 {
 326         snd_pcm_lib_preallocate_pages_for_all(pcm, SNDRV_DMA_TYPE_DEV,
 327                 card->dev, AU1XPSC_BUFFER_MIN_BYTES, (4096 * 1024) - 1);
 328
 329         return 0;
 330 }
 331
 332 static int au1xpsc_pcm_probe(struct platform_device *pdev)
 333 {
 334         if (!au1xpsc_audio_pcmdma[PCM_TX] || !au1xpsc_audio_pcmdma[PCM_RX])
 335                 return -ENODEV;
 336
 337         return 0;
 338 }
 339
 340 static int au1xpsc_pcm_remove(struct platform_device *pdev)
 341 {
 342         return 0;
 343 }
 344
 345 /* au1xpsc audio platform */
 346 struct snd_soc_platform au1xpsc_soc_platform = {
 347         .name           = "au1xpsc-pcm-dbdma",
 348         .probe          = au1xpsc_pcm_probe,
 349         .remove         = au1xpsc_pcm_remove,
 350         .pcm_ops        = &au1xpsc_pcm_ops,
 351         .pcm_new        = au1xpsc_pcm_new,
 352         .pcm_free       = au1xpsc_pcm_free_dma_buffers,
 353 };
 354 EXPORT_SYMBOL_GPL(au1xpsc_soc_platform);
 355
 356 static int __devinit au1xpsc_pcm_drvprobe(struct platform_device *pdev)
 357 {
 358         struct resource *r;
 359         int ret;
 360
 361         if (au1xpsc_audio_pcmdma[PCM_TX] || au1xpsc_audio_pcmdma[PCM_RX])
 362                 return -EBUSY;
 363
 364         /* TX DMA */
 365         au1xpsc_audio_pcmdma[PCM_TX]
 366                 = kzalloc(sizeof(struct au1xpsc_audio_dmadata), GFP_KERNEL);
 367         if (!au1xpsc_audio_pcmdma[PCM_TX])
 368                 return -ENOMEM;
 369
 370         r = platform_get_resource(pdev, IORESOURCE_DMA, 0);
 371         if (!r) {
 372                 ret = -ENODEV;
 373                 goto out1;
 374         }
 375         (au1xpsc_audio_pcmdma[PCM_TX])->ddma_id = r->start;
 376
 377         /* RX DMA */
 378         au1xpsc_audio_pcmdma[PCM_RX]
 379                 = kzalloc(sizeof(struct au1xpsc_audio_dmadata), GFP_KERNEL);
 380         if (!au1xpsc_audio_pcmdma[PCM_RX])
 381                 return -ENOMEM;
 382
 383         r = platform_get_resource(pdev, IORESOURCE_DMA, 1);
 384         if (!r) {
 385                 ret = -ENODEV;
 386                 goto out2;
 387         }
 388         (au1xpsc_audio_pcmdma[PCM_RX])->ddma_id = r->start;
 389
 390         ret = snd_soc_register_platform(&au1xpsc_soc_platform);
 391         if (!ret)
 392                 return ret;
 393
 394 out2:
 395         kfree(au1xpsc_audio_pcmdma[PCM_RX]);
 396         au1xpsc_audio_pcmdma[PCM_RX] = NULL;
 397 out1:
 398         kfree(au1xpsc_audio_pcmdma[PCM_TX]);
 399         au1xpsc_audio_pcmdma[PCM_TX] = NULL;
 400         return ret;
 401 }
 402
 403 static int __devexit au1xpsc_pcm_drvremove(struct platform_device *pdev)
 404 {
 405         int i;
 406
 407         snd_soc_unregister_platform(&au1xpsc_soc_platform);
 408
 409         for (i = 0; i < 2; i++) {
 410                 if (au1xpsc_audio_pcmdma[i]) {
 411                         au1x_pcm_dbdma_free(au1xpsc_audio_pcmdma[i]);
 412                         kfree(au1xpsc_audio_pcmdma[i]);
 413                         au1xpsc_audio_pcmdma[i] = NULL;
 414                 }
 415         }
 416
 417         return 0;
 418 }
 419
 420 static struct platform_driver au1xpsc_pcm_driver = {
 421         .driver = {
 422                 .name   = "au1xpsc-pcm",
 423                 .owner  = THIS_MODULE,
 424         },
 425         .probe          = au1xpsc_pcm_drvprobe,
 426         .remove         = __devexit_p(au1xpsc_pcm_drvremove),
 427 };
 428
 429 static int __init au1xpsc_audio_dbdma_load(void)
 430 {
 431         au1xpsc_audio_pcmdma[PCM_TX] = NULL;
 432         au1xpsc_audio_pcmdma[PCM_RX] = NULL;
 433         return platform_driver_register(&au1xpsc_pcm_driver);
 434 }
 435
 436 static void __exit au1xpsc_audio_dbdma_unload(void)
 437 {
 438         platform_driver_unregister(&au1xpsc_pcm_driver);
 439 }
 440
 441 module_init(au1xpsc_audio_dbdma_load);
 442 module_exit(au1xpsc_audio_dbdma_unload);
 443
 444
 445 struct platform_device *au1xpsc_pcm_add(struct platform_device *pdev)
 446 {
 447         struct resource *res, *r;
 448         struct platform_device *pd;
 449         int id[2];
 450         int ret;
 451
 452         r = platform_get_resource(pdev, IORESOURCE_DMA, 0);
 453         if (!r)
 454                 return NULL;
 455         id[0] = r->start;
 456
 457         r = platform_get_resource(pdev, IORESOURCE_DMA, 1);
 458         if (!r)
 459                 return NULL;
 460         id[1] = r->start;
 461
 462         res = kzalloc(sizeof(struct resource) * 2, GFP_KERNEL);
 463         if (!res)
 464                 return NULL;
 465
 466         res[0].start = res[0].end = id[0];
 467         res[1].start = res[1].end = id[1];
 468         res[0].flags = res[1].flags = IORESOURCE_DMA;
 469
 470         pd = platform_device_alloc("au1xpsc-pcm", -1);
 471         if (!pd)
 472                 goto out;
 473
 474         pd->resource = res;
 475         pd->num_resources = 2;
 476
 477         ret = platform_device_add(pd);
 478         if (!ret)
 479                 return pd;
 480
 481         platform_device_put(pd);
 482 out:
 483         kfree(res);
 484         return NULL;
 485 }
 486 EXPORT_SYMBOL_GPL(au1xpsc_pcm_add);
 487
 488 void au1xpsc_pcm_destroy(struct platform_device *dmapd)
 489 {
 490         if (dmapd)
 491                 platform_device_unregister(dmapd);
 492 }
 493 EXPORT_SYMBOL_GPL(au1xpsc_pcm_destroy);
 494
 495 MODULE_LICENSE("GPL");
 496 MODULE_DESCRIPTION("Au12x0/Au1550 PSC Audio DMA driver");
 497 MODULE_AUTHOR("Manuel Lauss");