sound/soc/fsl/mpc5200_psc_i2s.c

   1 /*
   2  * Freescale MPC5200 PSC in I2S mode
   3  * ALSA SoC Digital Audio Interface (DAI) driver
   4  *
   5  * Copyright (C) 2008 Secret Lab Technologies Ltd.
   6  */
   7
   8 #include <linux/init.h>
   9 #include <linux/module.h>
  10 #include <linux/interrupt.h>
  11 #include <linux/device.h>
  12 #include <linux/delay.h>
  13 #include <linux/of_device.h>
  14 #include <linux/of_platform.h>
  15 #include <linux/dma-mapping.h>
  16
  17 #include <sound/core.h>
  18 #include <sound/pcm.h>
  19 #include <sound/pcm_params.h>
  20 #include <sound/initval.h>
  21 #include <sound/soc.h>
  22 #include <sound/soc-of-simple.h>
  23
  24 #include <sysdev/bestcomm/bestcomm.h>
  25 #include <sysdev/bestcomm/gen_bd.h>
  26 #include <asm/mpc52xx_psc.h>
  27
  28 MODULE_AUTHOR("Grant Likely <grant.likely@secretlab.ca>");
  29 MODULE_DESCRIPTION("Freescale MPC5200 PSC in I2S mode ASoC Driver");
  30 MODULE_LICENSE("GPL");
  31
  32 /**
  33  * PSC_I2S_RATES: sample rates supported by the I2S
  34  *
  35  * This driver currently only supports the PSC running in I2S slave mode,
  36  * which means the codec determines the sample rate.  Therefore, we tell
  37  * ALSA that we support all rates and let the codec driver decide what rates
  38  * are really supported.
  39  */
  40 #define PSC_I2S_RATES (SNDRV_PCM_RATE_5512 | SNDRV_PCM_RATE_8000_192000 | \
  41                         SNDRV_PCM_RATE_CONTINUOUS)
  42
  43 /**
  44  * PSC_I2S_FORMATS: audio formats supported by the PSC I2S mode
  45  */
  46 #define PSC_I2S_FORMATS (SNDRV_PCM_FMTBIT_S8 | SNDRV_PCM_FMTBIT_S16_BE | \
  47                          SNDRV_PCM_FMTBIT_S24_BE | SNDRV_PCM_FMTBIT_S24_BE | \
  48                          SNDRV_PCM_FMTBIT_S32_BE)
  49
  50 /**
  51  * psc_i2s_stream - Data specific to a single stream (playback or capture)
  52  * @active:             flag indicating if the stream is active
  53  * @psc_i2s:            pointer back to parent psc_i2s data structure
  54  * @bcom_task:          bestcomm task structure
  55  * @irq:                irq number for bestcomm task
  56  * @period_start:       physical address of start of DMA region
  57  * @period_end:         physical address of end of DMA region
  58  * @period_next_pt:     physical address of next DMA buffer to enqueue
  59  * @period_bytes:       size of DMA period in bytes
  60  */
  61 struct psc_i2s_stream {
  62         int active;
  63         struct psc_i2s *psc_i2s;
  64         struct bcom_task *bcom_task;
  65         int irq;
  66         struct snd_pcm_substream *stream;
  67         dma_addr_t period_start;
  68         dma_addr_t period_end;
  69         dma_addr_t period_next_pt;
  70         dma_addr_t period_current_pt;
  71         int period_bytes;
  72 };
  73
  74 /**
  75  * psc_i2s - Private driver data
  76  * @name: short name for this device ("PSC0", "PSC1", etc)
  77  * @psc_regs: pointer to the PSC's registers
  78  * @fifo_regs: pointer to the PSC's FIFO registers
  79  * @irq: IRQ of this PSC
  80  * @dev: struct device pointer
  81  * @dai: the CPU DAI for this device
  82  * @sicr: Base value used in serial interface control register; mode is ORed
  83  *        with this value.
  84  * @playback: Playback stream context data
  85  * @capture: Capture stream context data
  86  */
  87 struct psc_i2s {
  88         char name[32];
  89         struct mpc52xx_psc __iomem *psc_regs;
  90         struct mpc52xx_psc_fifo __iomem *fifo_regs;
  91         unsigned int irq;
  92         struct device *dev;
  93         struct snd_soc_dai dai;
  94         spinlock_t lock;
  95         u32 sicr;
  96
  97         /* per-stream data */
  98         struct psc_i2s_stream playback;
  99         struct psc_i2s_stream capture;
 100
 101         /* Statistics */
 102         struct {
 103                 int overrun_count;
 104                 int underrun_count;
 105         } stats;
 106 };
 107
 108 /*
 109  * Interrupt handlers
 110  */
 111 static irqreturn_t psc_i2s_status_irq(int irq, void *_psc_i2s)
 112 {
 113         struct psc_i2s *psc_i2s = _psc_i2s;
 114         struct mpc52xx_psc __iomem *regs = psc_i2s->psc_regs;
 115         u16 isr;
 116
 117         isr = in_be16(&regs->mpc52xx_psc_isr);
 118
 119         /* Playback underrun error */
 120         if (psc_i2s->playback.active && (isr & MPC52xx_PSC_IMR_TXEMP))
 121                 psc_i2s->stats.underrun_count++;
 122
 123         /* Capture overrun error */
 124         if (psc_i2s->capture.active && (isr & MPC52xx_PSC_IMR_ORERR))
 125                 psc_i2s->stats.overrun_count++;
 126
 127         out_8(&regs->command, 4 << 4);  /* reset the error status */
 128
 129         return IRQ_HANDLED;
 130 }
 131
 132 /**
 133  * psc_i2s_bcom_enqueue_next_buffer - Enqueue another audio buffer
 134  * @s: pointer to stream private data structure
 135  *
 136  * Enqueues another audio period buffer into the bestcomm queue.
 137  *
 138  * Note: The routine must only be called when there is space available in
 139  * the queue.  Otherwise the enqueue will fail and the audio ring buffer
 140  * will get out of sync
 141  */
 142 static void psc_i2s_bcom_enqueue_next_buffer(struct psc_i2s_stream *s)
 143 {
 144         struct bcom_bd *bd;
 145
 146         /* Prepare and enqueue the next buffer descriptor */
 147         bd = bcom_prepare_next_buffer(s->bcom_task);
 148         bd->status = s->period_bytes;
 149         bd->data[0] = s->period_next_pt;
 150         bcom_submit_next_buffer(s->bcom_task, NULL);
 151
 152         /* Update for next period */
 153         s->period_next_pt += s->period_bytes;
 154         if (s->period_next_pt >= s->period_end)
 155                 s->period_next_pt = s->period_start;
 156 }
 157
 158 /* Bestcomm DMA irq handler */
 159 static irqreturn_t psc_i2s_bcom_irq(int irq, void *_psc_i2s_stream)
 160 {
 161         struct psc_i2s_stream *s = _psc_i2s_stream;
 162
 163         /* For each finished period, dequeue the completed period buffer
 164          * and enqueue a new one in it's place. */
 165         while (bcom_buffer_done(s->bcom_task)) {
 166                 bcom_retrieve_buffer(s->bcom_task, NULL, NULL);
 167                 s->period_current_pt += s->period_bytes;
 168                 if (s->period_current_pt >= s->period_end)
 169                         s->period_current_pt = s->period_start;
 170                 psc_i2s_bcom_enqueue_next_buffer(s);
 171                 bcom_enable(s->bcom_task);
 172         }
 173
 174         /* If the stream is active, then also inform the PCM middle layer
 175          * of the period finished event. */
 176         if (s->active)
 177                 snd_pcm_period_elapsed(s->stream);
 178
 179         return IRQ_HANDLED;
 180 }
 181
 182 /**
 183  * psc_i2s_startup: create a new substream
 184  *
 185  * This is the first function called when a stream is opened.
 186  *
 187  * If this is the first stream open, then grab the IRQ and program most of
 188  * the PSC registers.
 189  */
 190 static int psc_i2s_startup(struct snd_pcm_substream *substream)
 191 {
 192         struct snd_soc_pcm_runtime *rtd = substream->private_data;
 193         struct psc_i2s *psc_i2s = rtd->dai->cpu_dai->private_data;
 194         int rc;
 195
 196         dev_dbg(psc_i2s->dev, "psc_i2s_startup(substream=%p)\n", substream);
 197
 198         if (!psc_i2s->playback.active &&
 199             !psc_i2s->capture.active) {
 200                 /* Setup the IRQs */
 201                 rc = request_irq(psc_i2s->irq, &psc_i2s_status_irq, IRQF_SHARED,
 202                                  "psc-i2s-status", psc_i2s);
 203                 rc |= request_irq(psc_i2s->capture.irq,
 204                                   &psc_i2s_bcom_irq, IRQF_SHARED,
 205                                   "psc-i2s-capture", &psc_i2s->capture);
 206                 rc |= request_irq(psc_i2s->playback.irq,
 207                                   &psc_i2s_bcom_irq, IRQF_SHARED,
 208                                   "psc-i2s-playback", &psc_i2s->playback);
 209                 if (rc) {
 210                         free_irq(psc_i2s->irq, psc_i2s);
 211                         free_irq(psc_i2s->capture.irq,
 212                                  &psc_i2s->capture);
 213                         free_irq(psc_i2s->playback.irq,
 214                                  &psc_i2s->playback);
 215                         return -ENODEV;
 216                 }
 217         }
 218
 219         return 0;
 220 }
 221
 222 static int psc_i2s_hw_params(struct snd_pcm_substream *substream,
 223                                  struct snd_pcm_hw_params *params)
 224 {
 225         struct snd_soc_pcm_runtime *rtd = substream->private_data;
 226         struct psc_i2s *psc_i2s = rtd->dai->cpu_dai->private_data;
 227         u32 mode;
 228
 229         dev_dbg(psc_i2s->dev, "%s(substream=%p) p_size=%i p_bytes=%i"
 230                 " periods=%i buffer_size=%i  buffer_bytes=%i\n",
 231                 __func__, substream, params_period_size(params),
 232                 params_period_bytes(params), params_periods(params),
 233                 params_buffer_size(params), params_buffer_bytes(params));
 234
 235         switch (params_format(params)) {
 236         case SNDRV_PCM_FORMAT_S8:
 237                 mode = MPC52xx_PSC_SICR_SIM_CODEC_8;
 238                 break;
 239         case SNDRV_PCM_FORMAT_S16_BE:
 240                 mode = MPC52xx_PSC_SICR_SIM_CODEC_16;
 241                 break;
 242         case SNDRV_PCM_FORMAT_S24_BE:
 243                 mode = MPC52xx_PSC_SICR_SIM_CODEC_24;
 244                 break;
 245         case SNDRV_PCM_FORMAT_S32_BE:
 246                 mode = MPC52xx_PSC_SICR_SIM_CODEC_32;
 247                 break;
 248         default:
 249                 dev_dbg(psc_i2s->dev, "invalid format\n");
 250                 return -EINVAL;
 251         }
 252         out_be32(&psc_i2s->psc_regs->sicr, psc_i2s->sicr | mode);
 253
 254         snd_pcm_set_runtime_buffer(substream, &substream->dma_buffer);
 255
 256         return 0;
 257 }
 258
 259 static int psc_i2s_hw_free(struct snd_pcm_substream *substream)
 260 {
 261         snd_pcm_set_runtime_buffer(substream, NULL);
 262         return 0;
 263 }
 264
 265 /**
 266  * psc_i2s_trigger: start and stop the DMA transfer.
 267  *
 268  * This function is called by ALSA to start, stop, pause, and resume the DMA
 269  * transfer of data.
 270  */
 271 static int psc_i2s_trigger(struct snd_pcm_substream *substream, int cmd)
 272 {
 273         struct snd_soc_pcm_runtime *rtd = substream->private_data;
 274         struct psc_i2s *psc_i2s = rtd->dai->cpu_dai->private_data;
 275         struct snd_pcm_runtime *runtime = substream->runtime;
 276         struct psc_i2s_stream *s;
 277         struct mpc52xx_psc __iomem *regs = psc_i2s->psc_regs;
 278         u16 imr;
 279         u8 psc_cmd;
 280         unsigned long flags;
 281
 282         if (substream->pstr->stream == SNDRV_PCM_STREAM_CAPTURE)
 283                 s = &psc_i2s->capture;
 284         else
 285                 s = &psc_i2s->playback;
 286
 287         dev_dbg(psc_i2s->dev, "psc_i2s_trigger(substream=%p, cmd=%i)"
 288                 " stream_id=%i\n",
 289                 substream, cmd, substream->pstr->stream);
 290
 291         switch (cmd) {
 292         case SNDRV_PCM_TRIGGER_START:
 293                 s->period_bytes = frames_to_bytes(runtime,
 294                                                   runtime->period_size);
 295                 s->period_start = virt_to_phys(runtime->dma_area);
 296                 s->period_end = s->period_start +
 297                                 (s->period_bytes * runtime->periods);
 298                 s->period_next_pt = s->period_start;
 299                 s->period_current_pt = s->period_start;
 300                 s->active = 1;
 301
 302                 /* First; reset everything */
 303                 if (substream->pstr->stream == SNDRV_PCM_STREAM_CAPTURE) {
 304                         out_8(&regs->command, MPC52xx_PSC_RST_RX);
 305                         out_8(&regs->command, MPC52xx_PSC_RST_ERR_STAT);
 306                 } else {
 307                         out_8(&regs->command, MPC52xx_PSC_RST_TX);
 308                         out_8(&regs->command, MPC52xx_PSC_RST_ERR_STAT);
 309                 }
 310
 311                 /* Next, fill up the bestcomm bd queue and enable DMA.
 312                  * This will begin filling the PSC's fifo. */
 313                 if (substream->pstr->stream == SNDRV_PCM_STREAM_CAPTURE)
 314                         bcom_gen_bd_rx_reset(s->bcom_task);
 315                 else
 316                         bcom_gen_bd_tx_reset(s->bcom_task);
 317                 while (!bcom_queue_full(s->bcom_task))
 318                         psc_i2s_bcom_enqueue_next_buffer(s);
 319                 bcom_enable(s->bcom_task);
 320
 321                 /* Due to errata in the i2s mode; need to line up enabling
 322                  * the transmitter with a transition on the frame sync
 323                  * line */
 324
 325                 spin_lock_irqsave(&psc_i2s->lock, flags);
 326                 /* first make sure it is low */
 327                 while ((in_8(&regs->ipcr_acr.ipcr) & 0x80) != 0)
 328                         ;
 329                 /* then wait for the transition to high */
 330                 while ((in_8(&regs->ipcr_acr.ipcr) & 0x80) == 0)
 331                         ;
 332                 /* Finally, enable the PSC.
 333                  * Receiver must always be enabled; even when we only want
 334                  * transmit.  (see 15.3.2.3 of MPC5200B User's Guide) */
 335                 psc_cmd = MPC52xx_PSC_RX_ENABLE;
 336                 if (substream->pstr->stream == SNDRV_PCM_STREAM_PLAYBACK)
 337                         psc_cmd |= MPC52xx_PSC_TX_ENABLE;
 338                 out_8(&regs->command, psc_cmd);
 339                 spin_unlock_irqrestore(&psc_i2s->lock, flags);
 340
 341                 break;
 342
 343         case SNDRV_PCM_TRIGGER_STOP:
 344                 /* Turn off the PSC */
 345                 s->active = 0;
 346                 if (substream->pstr->stream == SNDRV_PCM_STREAM_CAPTURE) {
 347                         if (!psc_i2s->playback.active) {
 348                                 out_8(&regs->command, 2 << 4);  /* reset rx */
 349                                 out_8(&regs->command, 3 << 4);  /* reset tx */
 350                                 out_8(&regs->command, 4 << 4);  /* reset err */
 351                         }
 352                 } else {
 353                         out_8(&regs->command, 3 << 4);  /* reset tx */
 354                         out_8(&regs->command, 4 << 4);  /* reset err */
 355                         if (!psc_i2s->capture.active)
 356                                 out_8(&regs->command, 2 << 4);  /* reset rx */
 357                 }
 358
 359                 bcom_disable(s->bcom_task);
 360                 while (!bcom_queue_empty(s->bcom_task))
 361                         bcom_retrieve_buffer(s->bcom_task, NULL, NULL);
 362
 363                 break;
 364
 365         default:
 366                 dev_dbg(psc_i2s->dev, "invalid command\n");
 367                 return -EINVAL;
 368         }
 369
 370         /* Update interrupt enable settings */
 371         imr = 0;
 372         if (psc_i2s->playback.active)
 373                 imr |= MPC52xx_PSC_IMR_TXEMP;
 374         if (psc_i2s->capture.active)
 375                 imr |= MPC52xx_PSC_IMR_ORERR;
 376         out_be16(&regs->isr_imr.imr, imr);
 377
 378         return 0;
 379 }
 380
 381 /**
 382  * psc_i2s_shutdown: shutdown the data transfer on a stream
 383  *
 384  * Shutdown the PSC if there are no other substreams open.
 385  */
 386 static void psc_i2s_shutdown(struct snd_pcm_substream *substream)
 387 {
 388         struct snd_soc_pcm_runtime *rtd = substream->private_data;
 389         struct psc_i2s *psc_i2s = rtd->dai->cpu_dai->private_data;
 390
 391         dev_dbg(psc_i2s->dev, "psc_i2s_shutdown(substream=%p)\n", substream);
 392
 393         /*
 394          * If this is the last active substream, disable the PSC and release
 395          * the IRQ.
 396          */
 397         if (!psc_i2s->playback.active &&
 398             !psc_i2s->capture.active) {
 399
 400                 /* Disable all interrupts and reset the PSC */
 401                 out_be16(&psc_i2s->psc_regs->isr_imr.imr, 0);
 402                 out_8(&psc_i2s->psc_regs->command, 3 << 4); /* reset tx */
 403                 out_8(&psc_i2s->psc_regs->command, 2 << 4); /* reset rx */
 404                 out_8(&psc_i2s->psc_regs->command, 1 << 4); /* reset mode */
 405                 out_8(&psc_i2s->psc_regs->command, 4 << 4); /* reset error */
 406
 407                 /* Release irqs */
 408                 free_irq(psc_i2s->irq, psc_i2s);
 409                 free_irq(psc_i2s->capture.irq, &psc_i2s->capture);
 410                 free_irq(psc_i2s->playback.irq, &psc_i2s->playback);
 411         }
 412 }
 413
 414 /**
 415  * psc_i2s_set_sysclk: set the clock frequency and direction
 416  *
 417  * This function is called by the machine driver to tell us what the clock
 418  * frequency and direction are.
 419  *
 420  * Currently, we only support operating as a clock slave (SND_SOC_CLOCK_IN),
 421  * and we don't care about the frequency.  Return an error if the direction
 422  * is not SND_SOC_CLOCK_IN.
 423  *
 424  * @clk_id: reserved, should be zero
 425  * @freq: the frequency of the given clock ID, currently ignored
 426  * @dir: SND_SOC_CLOCK_IN (clock slave) or SND_SOC_CLOCK_OUT (clock master)
 427  */
 428 static int psc_i2s_set_sysclk(struct snd_soc_dai *cpu_dai,
 429                               int clk_id, unsigned int freq, int dir)
 430 {
 431         struct psc_i2s *psc_i2s = cpu_dai->private_data;
 432         dev_dbg(psc_i2s->dev, "psc_i2s_set_sysclk(cpu_dai=%p, dir=%i)\n",
 433                                 cpu_dai, dir);
 434         return (dir == SND_SOC_CLOCK_IN) ? 0 : -EINVAL;
 435 }
 436
 437 /**
 438  * psc_i2s_set_fmt: set the serial format.
 439  *
 440  * This function is called by the machine driver to tell us what serial
 441  * format to use.
 442  *
 443  * This driver only supports I2S mode.  Return an error if the format is
 444  * not SND_SOC_DAIFMT_I2S.
 445  *
 446  * @format: one of SND_SOC_DAIFMT_xxx
 447  */
 448 static int psc_i2s_set_fmt(struct snd_soc_dai *cpu_dai, unsigned int format)
 449 {
 450         struct psc_i2s *psc_i2s = cpu_dai->private_data;
 451         dev_dbg(psc_i2s->dev, "psc_i2s_set_fmt(cpu_dai=%p, format=%i)\n",
 452                                 cpu_dai, format);
 453         return (format == SND_SOC_DAIFMT_I2S) ? 0 : -EINVAL;
 454 }
 455
 456 /* ---------------------------------------------------------------------
 457  * ALSA SoC Bindings
 458  *
 459  * - Digital Audio Interface (DAI) template
 460  * - create/destroy dai hooks
 461  */
 462
 463 /**
 464  * psc_i2s_dai_template: template CPU Digital Audio Interface
 465  */
 466 static struct snd_soc_dai psc_i2s_dai_template = {
 467         .type = SND_SOC_DAI_I2S,
 468         .playback = {
 469                 .channels_min = 2,
 470                 .channels_max = 2,
 471                 .rates = PSC_I2S_RATES,
 472                 .formats = PSC_I2S_FORMATS,
 473         },
 474         .capture = {
 475                 .channels_min = 2,
 476                 .channels_max = 2,
 477                 .rates = PSC_I2S_RATES,
 478                 .formats = PSC_I2S_FORMATS,
 479         },
 480         .ops = {
 481                 .startup = psc_i2s_startup,
 482                 .hw_params = psc_i2s_hw_params,
 483                 .hw_free = psc_i2s_hw_free,
 484                 .shutdown = psc_i2s_shutdown,
 485                 .trigger = psc_i2s_trigger,
 486         },
 487         .dai_ops = {
 488                 .set_sysclk = psc_i2s_set_sysclk,
 489                 .set_fmt = psc_i2s_set_fmt,
 490         },
 491 };
 492
 493 /* ---------------------------------------------------------------------
 494  * The PSC I2S 'ASoC platform' driver
 495  *
 496  * Can be referenced by an 'ASoC machine' driver
 497  * This driver only deals with the audio bus; it doesn't have any
 498  * interaction with the attached codec
 499  */
 500
 501 static const struct snd_pcm_hardware psc_i2s_pcm_hardware = {
 502         .info = SNDRV_PCM_INFO_MMAP | SNDRV_PCM_INFO_MMAP_VALID |
 503                 SNDRV_PCM_INFO_INTERLEAVED | SNDRV_PCM_INFO_BLOCK_TRANSFER,
 504         .formats = SNDRV_PCM_FMTBIT_S8 | SNDRV_PCM_FMTBIT_S16_BE |
 505                    SNDRV_PCM_FMTBIT_S24_BE | SNDRV_PCM_FMTBIT_S32_BE,
 506         .rate_min = 8000,
 507         .rate_max = 48000,
 508         .channels_min = 2,
 509         .channels_max = 2,
 510         .period_bytes_max       = 1024 * 1024,
 511         .period_bytes_min       = 32,
 512         .periods_min            = 2,
 513         .periods_max            = 256,
 514         .buffer_bytes_max       = 2 * 1024 * 1024,
 515         .fifo_size              = 0,
 516 };
 517
 518 static int psc_i2s_pcm_open(struct snd_pcm_substream *substream)
 519 {
 520         struct snd_soc_pcm_runtime *rtd = substream->private_data;
 521         struct psc_i2s *psc_i2s = rtd->dai->cpu_dai->private_data;
 522         struct psc_i2s_stream *s;
 523
 524         dev_dbg(psc_i2s->dev, "psc_i2s_pcm_open(substream=%p)\n", substream);
 525
 526         if (substream->pstr->stream == SNDRV_PCM_STREAM_CAPTURE)
 527                 s = &psc_i2s->capture;
 528         else
 529                 s = &psc_i2s->playback;
 530
 531         snd_soc_set_runtime_hwparams(substream, &psc_i2s_pcm_hardware);
 532
 533         s->stream = substream;
 534         return 0;
 535 }
 536
 537 static int psc_i2s_pcm_close(struct snd_pcm_substream *substream)
 538 {
 539         struct snd_soc_pcm_runtime *rtd = substream->private_data;
 540         struct psc_i2s *psc_i2s = rtd->dai->cpu_dai->private_data;
 541         struct psc_i2s_stream *s;
 542
 543         dev_dbg(psc_i2s->dev, "psc_i2s_pcm_close(substream=%p)\n", substream);
 544
 545         if (substream->pstr->stream == SNDRV_PCM_STREAM_CAPTURE)
 546                 s = &psc_i2s->capture;
 547         else
 548                 s = &psc_i2s->playback;
 549
 550         s->stream = NULL;
 551         return 0;
 552 }
 553
 554 static snd_pcm_uframes_t
 555 psc_i2s_pcm_pointer(struct snd_pcm_substream *substream)
 556 {
 557         struct snd_soc_pcm_runtime *rtd = substream->private_data;
 558         struct psc_i2s *psc_i2s = rtd->dai->cpu_dai->private_data;
 559         struct psc_i2s_stream *s;
 560         dma_addr_t count;
 561
 562         if (substream->pstr->stream == SNDRV_PCM_STREAM_CAPTURE)
 563                 s = &psc_i2s->capture;
 564         else
 565                 s = &psc_i2s->playback;
 566
 567         count = s->period_current_pt - s->period_start;
 568
 569         return bytes_to_frames(substream->runtime, count);
 570 }
 571
 572 static struct snd_pcm_ops psc_i2s_pcm_ops = {
 573         .open           = psc_i2s_pcm_open,
 574         .close          = psc_i2s_pcm_close,
 575         .ioctl          = snd_pcm_lib_ioctl,
 576         .pointer        = psc_i2s_pcm_pointer,
 577 };
 578
 579 static u64 psc_i2s_pcm_dmamask = 0xffffffff;
 580 static int psc_i2s_pcm_new(struct snd_card *card, struct snd_soc_dai *dai,
 581                            struct snd_pcm *pcm)
 582 {
 583         struct snd_soc_pcm_runtime *rtd = pcm->private_data;
 584         size_t size = psc_i2s_pcm_hardware.buffer_bytes_max;
 585         int rc = 0;
 586
 587         dev_dbg(rtd->socdev->dev, "psc_i2s_pcm_new(card=%p, dai=%p, pcm=%p)\n",
 588                 card, dai, pcm);
 589
 590         if (!card->dev->dma_mask)
 591                 card->dev->dma_mask = &psc_i2s_pcm_dmamask;
 592         if (!card->dev->coherent_dma_mask)
 593                 card->dev->coherent_dma_mask = 0xffffffff;
 594
 595         if (pcm->streams[0].substream) {
 596                 rc = snd_dma_alloc_pages(SNDRV_DMA_TYPE_DEV, pcm->dev, size,
 597                                         &pcm->streams[0].substream->dma_buffer);
 598                 if (rc)
 599                         goto playback_alloc_err;
 600         }
 601
 602         if (pcm->streams[1].substream) {
 603                 rc = snd_dma_alloc_pages(SNDRV_DMA_TYPE_DEV, pcm->dev, size,
 604                                         &pcm->streams[1].substream->dma_buffer);
 605                 if (rc)
 606                         goto capture_alloc_err;
 607         }
 608
 609         return 0;
 610
 611  capture_alloc_err:
 612         if (pcm->streams[0].substream)
 613                 snd_dma_free_pages(&pcm->streams[0].substream->dma_buffer);
 614  playback_alloc_err:
 615         dev_err(card->dev, "Cannot allocate buffer(s)\n");
 616         return -ENOMEM;
 617 }
 618
 619 static void psc_i2s_pcm_free(struct snd_pcm *pcm)
 620 {
 621         struct snd_soc_pcm_runtime *rtd = pcm->private_data;
 622         struct snd_pcm_substream *substream;
 623         int stream;
 624
 625         dev_dbg(rtd->socdev->dev, "psc_i2s_pcm_free(pcm=%p)\n", pcm);
 626
 627         for (stream = 0; stream < 2; stream++) {
 628                 substream = pcm->streams[stream].substream;
 629                 if (substream) {
 630                         snd_dma_free_pages(&substream->dma_buffer);
 631                         substream->dma_buffer.area = NULL;
 632                         substream->dma_buffer.addr = 0;
 633                 }
 634         }
 635 }
 636
 637 struct snd_soc_platform psc_i2s_pcm_soc_platform = {
 638         .name           = "mpc5200-psc-audio",
 639         .pcm_ops        = &psc_i2s_pcm_ops,
 640         .pcm_new        = &psc_i2s_pcm_new,
 641         .pcm_free       = &psc_i2s_pcm_free,
 642 };
 643
 644 /* ---------------------------------------------------------------------
 645  * Sysfs attributes for debugging
 646  */
 647
 648 static ssize_t psc_i2s_status_show(struct device *dev,
 649                            struct device_attribute *attr, char *buf)
 650 {
 651         struct psc_i2s *psc_i2s = dev_get_drvdata(dev);
 652
 653         return sprintf(buf, "status=%.4x sicr=%.8x rfnum=%i rfstat=0x%.4x "
 654                         "tfnum=%i tfstat=0x%.4x\n",
 655                         in_be16(&psc_i2s->psc_regs->sr_csr.status),
 656                         in_be32(&psc_i2s->psc_regs->sicr),
 657                         in_be16(&psc_i2s->fifo_regs->rfnum) & 0x1ff,
 658                         in_be16(&psc_i2s->fifo_regs->rfstat),
 659                         in_be16(&psc_i2s->fifo_regs->tfnum) & 0x1ff,
 660                         in_be16(&psc_i2s->fifo_regs->tfstat));
 661 }
 662
 663 static int *psc_i2s_get_stat_attr(struct psc_i2s *psc_i2s, const char *name)
 664 {
 665         if (strcmp(name, "playback_underrun") == 0)
 666                 return &psc_i2s->stats.underrun_count;
 667         if (strcmp(name, "capture_overrun") == 0)
 668                 return &psc_i2s->stats.overrun_count;
 669
 670         return NULL;
 671 }
 672
 673 static ssize_t psc_i2s_stat_show(struct device *dev,
 674                                  struct device_attribute *attr, char *buf)
 675 {
 676         struct psc_i2s *psc_i2s = dev_get_drvdata(dev);
 677         int *attrib;
 678
 679         attrib = psc_i2s_get_stat_attr(psc_i2s, attr->attr.name);
 680         if (!attrib)
 681                 return 0;
 682
 683         return sprintf(buf, "%i\n", *attrib);
 684 }
 685
 686 static ssize_t psc_i2s_stat_store(struct device *dev,
 687                                   struct device_attribute *attr,
 688                                   const char *buf,
 689                                   size_t count)
 690 {
 691         struct psc_i2s *psc_i2s = dev_get_drvdata(dev);
 692         int *attrib;
 693
 694         attrib = psc_i2s_get_stat_attr(psc_i2s, attr->attr.name);
 695         if (!attrib)
 696                 return 0;
 697
 698         *attrib = simple_strtoul(buf, NULL, 0);
 699         return count;
 700 }
 701
 702 static DEVICE_ATTR(status, 0644, psc_i2s_status_show, NULL);
 703 static DEVICE_ATTR(playback_underrun, 0644, psc_i2s_stat_show,
 704                         psc_i2s_stat_store);
 705 static DEVICE_ATTR(capture_overrun, 0644, psc_i2s_stat_show,
 706                         psc_i2s_stat_store);
 707
 708 /* ---------------------------------------------------------------------
 709  * OF platform bus binding code:
 710  * - Probe/remove operations
 711  * - OF device match table
 712  */
 713 static int __devinit psc_i2s_of_probe(struct of_device *op,
 714                                       const struct of_device_id *match)
 715 {
 716         phys_addr_t fifo;
 717         struct psc_i2s *psc_i2s;
 718         struct resource res;
 719         int size, psc_id, irq, rc;
 720         const __be32 *prop;
 721         void __iomem *regs;
 722
 723         dev_dbg(&op->dev, "probing psc i2s device\n");
 724
 725         /* Get the PSC ID */
 726         prop = of_get_property(op->node, "cell-index", &size);
 727         if (!prop || size < sizeof *prop)
 728                 return -ENODEV;
 729         psc_id = be32_to_cpu(*prop);
 730
 731         /* Fetch the registers and IRQ of the PSC */
 732         irq = irq_of_parse_and_map(op->node, 0);
 733         if (of_address_to_resource(op->node, 0, &res)) {
 734                 dev_err(&op->dev, "Missing reg property\n");
 735                 return -ENODEV;
 736         }
 737         regs = ioremap(res.start, 1 + res.end - res.start);
 738         if (!regs) {
 739                 dev_err(&op->dev, "Could not map registers\n");
 740                 return -ENODEV;
 741         }
 742
 743         /* Allocate and initialize the driver private data */
 744         psc_i2s = kzalloc(sizeof *psc_i2s, GFP_KERNEL);
 745         if (!psc_i2s) {
 746                 iounmap(regs);
 747                 return -ENOMEM;
 748         }
 749         spin_lock_init(&psc_i2s->lock);
 750         psc_i2s->irq = irq;
 751         psc_i2s->psc_regs = regs;
 752         psc_i2s->fifo_regs = regs + sizeof *psc_i2s->psc_regs;
 753         psc_i2s->dev = &op->dev;
 754         psc_i2s->playback.psc_i2s = psc_i2s;
 755         psc_i2s->capture.psc_i2s = psc_i2s;
 756         snprintf(psc_i2s->name, sizeof psc_i2s->name, "PSC%u", psc_id+1);
 757
 758         /* Fill out the CPU DAI structure */
 759         memcpy(&psc_i2s->dai, &psc_i2s_dai_template, sizeof psc_i2s->dai);
 760         psc_i2s->dai.private_data = psc_i2s;
 761         psc_i2s->dai.name = psc_i2s->name;
 762         psc_i2s->dai.id = psc_id;
 763
 764         /* Find the address of the fifo data registers and setup the
 765          * DMA tasks */
 766         fifo = res.start + offsetof(struct mpc52xx_psc, buffer.buffer_32);
 767         psc_i2s->capture.bcom_task =
 768                 bcom_psc_gen_bd_rx_init(psc_id, 10, fifo, 512);
 769         psc_i2s->playback.bcom_task =
 770                 bcom_psc_gen_bd_tx_init(psc_id, 10, fifo);
 771         if (!psc_i2s->capture.bcom_task ||
 772             !psc_i2s->playback.bcom_task) {
 773                 dev_err(&op->dev, "Could not allocate bestcomm tasks\n");
 774                 iounmap(regs);
 775                 kfree(psc_i2s);
 776                 return -ENODEV;
 777         }
 778
 779         /* Disable all interrupts and reset the PSC */
 780         out_be16(&psc_i2s->psc_regs->isr_imr.imr, 0);
 781         out_8(&psc_i2s->psc_regs->command, 3 << 4); /* reset transmitter */
 782         out_8(&psc_i2s->psc_regs->command, 2 << 4); /* reset receiver */
 783         out_8(&psc_i2s->psc_regs->command, 1 << 4); /* reset mode */
 784         out_8(&psc_i2s->psc_regs->command, 4 << 4); /* reset error */
 785
 786         /* Configure the serial interface mode; defaulting to CODEC8 mode */
 787         psc_i2s->sicr = MPC52xx_PSC_SICR_DTS1 | MPC52xx_PSC_SICR_I2S |
 788                         MPC52xx_PSC_SICR_CLKPOL;
 789         if (of_get_property(op->node, "fsl,cellslave", NULL))
 790                 psc_i2s->sicr |= MPC52xx_PSC_SICR_CELLSLAVE |
 791                                  MPC52xx_PSC_SICR_GENCLK;
 792         out_be32(&psc_i2s->psc_regs->sicr,
 793                  psc_i2s->sicr | MPC52xx_PSC_SICR_SIM_CODEC_8);
 794
 795         /* Check for the codec handle.  If it is not present then we
 796          * are done */
 797         if (!of_get_property(op->node, "codec-handle", NULL))
 798                 return 0;
 799
 800         /* Set up mode register;
 801          * First write: RxRdy (FIFO Alarm) generates rx FIFO irq
 802          * Second write: register Normal mode for non loopback
 803          */
 804         out_8(&psc_i2s->psc_regs->mode, 0);
 805         out_8(&psc_i2s->psc_regs->mode, 0);
 806
 807         /* Set the TX and RX fifo alarm thresholds */
 808         out_be16(&psc_i2s->fifo_regs->rfalarm, 0x100);
 809         out_8(&psc_i2s->fifo_regs->rfcntl, 0x4);
 810         out_be16(&psc_i2s->fifo_regs->tfalarm, 0x100);
 811         out_8(&psc_i2s->fifo_regs->tfcntl, 0x7);
 812
 813         /* Lookup the IRQ numbers */
 814         psc_i2s->playback.irq =
 815                 bcom_get_task_irq(psc_i2s->playback.bcom_task);
 816         psc_i2s->capture.irq =
 817                 bcom_get_task_irq(psc_i2s->capture.bcom_task);
 818
 819         /* Save what we've done so it can be found again later */
 820         dev_set_drvdata(&op->dev, psc_i2s);
 821
 822         /* Register the SYSFS files */
 823         rc = device_create_file(psc_i2s->dev, &dev_attr_status);
 824         rc |= device_create_file(psc_i2s->dev, &dev_attr_capture_overrun);
 825         rc |= device_create_file(psc_i2s->dev, &dev_attr_playback_underrun);
 826         if (rc)
 827                 dev_info(psc_i2s->dev, "error creating sysfs files\n");
 828
 829         /* Tell the ASoC OF helpers about it */
 830         of_snd_soc_register_platform(&psc_i2s_pcm_soc_platform, op->node,
 831                                      &psc_i2s->dai);
 832
 833         return 0;
 834 }
 835
 836 static int __devexit psc_i2s_of_remove(struct of_device *op)
 837 {
 838         struct psc_i2s *psc_i2s = dev_get_drvdata(&op->dev);
 839
 840         dev_dbg(&op->dev, "psc_i2s_remove()\n");
 841
 842         bcom_gen_bd_rx_release(psc_i2s->capture.bcom_task);
 843         bcom_gen_bd_tx_release(psc_i2s->playback.bcom_task);
 844
 845         iounmap(psc_i2s->psc_regs);
 846         iounmap(psc_i2s->fifo_regs);
 847         kfree(psc_i2s);
 848         dev_set_drvdata(&op->dev, NULL);
 849
 850         return 0;
 851 }
 852
 853 /* Match table for of_platform binding */
 854 static struct of_device_id psc_i2s_match[] __devinitdata = {
 855         { .compatible = "fsl,mpc5200-psc-i2s", },
 856         {}
 857 };
 858 MODULE_DEVICE_TABLE(of, psc_i2s_match);
 859
 860 static struct of_platform_driver psc_i2s_driver = {
 861         .match_table = psc_i2s_match,
 862         .probe = psc_i2s_of_probe,
 863         .remove = __devexit_p(psc_i2s_of_remove),
 864         .driver = {
 865                 .name = "mpc5200-psc-i2s",
 866                 .owner = THIS_MODULE,
 867         },
 868 };
 869
 870 /* ---------------------------------------------------------------------
 871  * Module setup and teardown; simply register the of_platform driver
 872  * for the PSC in I2S mode.
 873  */
 874 static int __init psc_i2s_init(void)
 875 {
 876         return of_register_platform_driver(&psc_i2s_driver);
 877 }
 878 module_init(psc_i2s_init);
 879
 880 static void __exit psc_i2s_exit(void)
 881 {
 882         of_unregister_platform_driver(&psc_i2s_driver);
 883 }
 884 module_exit(psc_i2s_exit);
 885
 886