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   1 /*
   2  * atmel_ssc_dai.c  --  ALSA SoC ATMEL SSC Audio Layer Platform driver
   3  *
   4  * Copyright (C) 2005 SAN People
   5  * Copyright (C) 2008 Atmel
   6  *
   7  * Author: Sedji Gaouaou <sedji.gaouaou@atmel.com>
   8  *         ATMEL CORP.
   9  *
  10  * Based on at91-ssc.c by
  11  * Frank Mandarino <fmandarino@endrelia.com>
  12  * Based on pxa2xx Platform drivers by
  13  * Liam Girdwood <lrg@slimlogic.co.uk>
  14  *
  15  * This program is free software; you can redistribute it and/or modify
  16  * it under the terms of the GNU General Public License as published by
  17  * the Free Software Foundation; either version 2 of the License, or
  18  * (at your option) any later version.
  19  *
  20  * This program is distributed in the hope that it will be useful,
  21  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  22  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  23  * GNU General Public License for more details.
  24  *
  25  * You should have received a copy of the GNU General Public License
  26  * along with this program; if not, write to the Free Software
  27  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  28  */
  29
  30 #include <linux/init.h>
  31 #include <linux/module.h>
  32 #include <linux/interrupt.h>
  33 #include <linux/device.h>
  34 #include <linux/delay.h>
  35 #include <linux/clk.h>
  36 #include <linux/atmel_pdc.h>
  37
  38 #include <linux/atmel-ssc.h>
  39 #include <sound/core.h>
  40 #include <sound/pcm.h>
  41 #include <sound/pcm_params.h>
  42 #include <sound/initval.h>
  43 #include <sound/soc.h>
  44
  45 #include <mach/hardware.h>
  46
  47 #include "atmel-pcm.h"
  48 #include "atmel_ssc_dai.h"
  49
  50
  51 #if defined(CONFIG_ARCH_AT91SAM9260) || defined(CONFIG_ARCH_AT91SAM9G20)
  52 #define NUM_SSC_DEVICES         1
  53 #else
  54 #define NUM_SSC_DEVICES         3
  55 #endif
  56
  57 /*
  58  * SSC PDC registers required by the PCM DMA engine.
  59  */
  60 static struct atmel_pdc_regs pdc_tx_reg = {
  61         .xpr            = ATMEL_PDC_TPR,
  62         .xcr            = ATMEL_PDC_TCR,
  63         .xnpr           = ATMEL_PDC_TNPR,
  64         .xncr           = ATMEL_PDC_TNCR,
  65 };
  66
  67 static struct atmel_pdc_regs pdc_rx_reg = {
  68         .xpr            = ATMEL_PDC_RPR,
  69         .xcr            = ATMEL_PDC_RCR,
  70         .xnpr           = ATMEL_PDC_RNPR,
  71         .xncr           = ATMEL_PDC_RNCR,
  72 };
  73
  74 /*
  75  * SSC & PDC status bits for transmit and receive.
  76  */
  77 static struct atmel_ssc_mask ssc_tx_mask = {
  78         .ssc_enable     = SSC_BIT(CR_TXEN),
  79         .ssc_disable    = SSC_BIT(CR_TXDIS),
  80         .ssc_endx       = SSC_BIT(SR_ENDTX),
  81         .ssc_endbuf     = SSC_BIT(SR_TXBUFE),
  82         .pdc_enable     = ATMEL_PDC_TXTEN,
  83         .pdc_disable    = ATMEL_PDC_TXTDIS,
  84 };
  85
  86 static struct atmel_ssc_mask ssc_rx_mask = {
  87         .ssc_enable     = SSC_BIT(CR_RXEN),
  88         .ssc_disable    = SSC_BIT(CR_RXDIS),
  89         .ssc_endx       = SSC_BIT(SR_ENDRX),
  90         .ssc_endbuf     = SSC_BIT(SR_RXBUFF),
  91         .pdc_enable     = ATMEL_PDC_RXTEN,
  92         .pdc_disable    = ATMEL_PDC_RXTDIS,
  93 };
  94
  95
  96 /*
  97  * DMA parameters.
  98  */
  99 static struct atmel_pcm_dma_params ssc_dma_params[NUM_SSC_DEVICES][2] = {
 100         {{
 101         .name           = "SSC0 PCM out",
 102         .pdc            = &pdc_tx_reg,
 103         .mask           = &ssc_tx_mask,
 104         },
 105         {
 106         .name           = "SSC0 PCM in",
 107         .pdc            = &pdc_rx_reg,
 108         .mask           = &ssc_rx_mask,
 109         } },
 110 #if NUM_SSC_DEVICES == 3
 111         {{
 112         .name           = "SSC1 PCM out",
 113         .pdc            = &pdc_tx_reg,
 114         .mask           = &ssc_tx_mask,
 115         },
 116         {
 117         .name           = "SSC1 PCM in",
 118         .pdc            = &pdc_rx_reg,
 119         .mask           = &ssc_rx_mask,
 120         } },
 121         {{
 122         .name           = "SSC2 PCM out",
 123         .pdc            = &pdc_tx_reg,
 124         .mask           = &ssc_tx_mask,
 125         },
 126         {
 127         .name           = "SSC2 PCM in",
 128         .pdc            = &pdc_rx_reg,
 129         .mask           = &ssc_rx_mask,
 130         } },
 131 #endif
 132 };
 133
 134
 135 static struct atmel_ssc_info ssc_info[NUM_SSC_DEVICES] = {
 136         {
 137         .name           = "ssc0",
 138         .lock           = __SPIN_LOCK_UNLOCKED(ssc_info[0].lock),
 139         .dir_mask       = SSC_DIR_MASK_UNUSED,
 140         .initialized    = 0,
 141         },
 142 #if NUM_SSC_DEVICES == 3
 143         {
 144         .name           = "ssc1",
 145         .lock           = __SPIN_LOCK_UNLOCKED(ssc_info[1].lock),
 146         .dir_mask       = SSC_DIR_MASK_UNUSED,
 147         .initialized    = 0,
 148         },
 149         {
 150         .name           = "ssc2",
 151         .lock           = __SPIN_LOCK_UNLOCKED(ssc_info[2].lock),
 152         .dir_mask       = SSC_DIR_MASK_UNUSED,
 153         .initialized    = 0,
 154         },
 155 #endif
 156 };
 157
 158
 159 /*
 160  * SSC interrupt handler.  Passes PDC interrupts to the DMA
 161  * interrupt handler in the PCM driver.
 162  */
 163 static irqreturn_t atmel_ssc_interrupt(int irq, void *dev_id)
 164 {
 165         struct atmel_ssc_info *ssc_p = dev_id;
 166         struct atmel_pcm_dma_params *dma_params;
 167         u32 ssc_sr;
 168         u32 ssc_substream_mask;
 169         int i;
 170
 171         ssc_sr = (unsigned long)ssc_readl(ssc_p->ssc->regs, SR)
 172                         & (unsigned long)ssc_readl(ssc_p->ssc->regs, IMR);
 173
 174         /*
 175          * Loop through the substreams attached to this SSC.  If
 176          * a DMA-related interrupt occurred on that substream, call
 177          * the DMA interrupt handler function, if one has been
 178          * registered in the dma_params structure by the PCM driver.
 179          */
 180         for (i = 0; i < ARRAY_SIZE(ssc_p->dma_params); i++) {
 181                 dma_params = ssc_p->dma_params[i];
 182
 183                 if ((dma_params != NULL) &&
 184                         (dma_params->dma_intr_handler != NULL)) {
 185                         ssc_substream_mask = (dma_params->mask->ssc_endx |
 186                                         dma_params->mask->ssc_endbuf);
 187                         if (ssc_sr & ssc_substream_mask) {
 188                                 dma_params->dma_intr_handler(ssc_sr,
 189                                                 dma_params->
 190                                                 substream);
 191                         }
 192                 }
 193         }
 194
 195         return IRQ_HANDLED;
 196 }
 197
 198
 199 /*-------------------------------------------------------------------------*\
 200  * DAI functions
 201 \*-------------------------------------------------------------------------*/
 202 /*
 203  * Startup.  Only that one substream allowed in each direction.
 204  */
 205 static int atmel_ssc_startup(struct snd_pcm_substream *substream,
 206                              struct snd_soc_dai *dai)
 207 {
 208         struct snd_soc_pcm_runtime *rtd = snd_pcm_substream_chip(substream);
 209         struct atmel_ssc_info *ssc_p = &ssc_info[rtd->dai->cpu_dai->id];
 210         int dir_mask;
 211
 212         pr_debug("atmel_ssc_startup: SSC_SR=0x%u\n",
 213                 ssc_readl(ssc_p->ssc->regs, SR));
 214
 215         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
 216                 dir_mask = SSC_DIR_MASK_PLAYBACK;
 217         else
 218                 dir_mask = SSC_DIR_MASK_CAPTURE;
 219
 220         spin_lock_irq(&ssc_p->lock);
 221         if (ssc_p->dir_mask & dir_mask) {
 222                 spin_unlock_irq(&ssc_p->lock);
 223                 return -EBUSY;
 224         }
 225         ssc_p->dir_mask |= dir_mask;
 226         spin_unlock_irq(&ssc_p->lock);
 227
 228         return 0;
 229 }
 230
 231 /*
 232  * Shutdown.  Clear DMA parameters and shutdown the SSC if there
 233  * are no other substreams open.
 234  */
 235 static void atmel_ssc_shutdown(struct snd_pcm_substream *substream,
 236                                struct snd_soc_dai *dai)
 237 {
 238         struct snd_soc_pcm_runtime *rtd = snd_pcm_substream_chip(substream);
 239         struct atmel_ssc_info *ssc_p = &ssc_info[rtd->dai->cpu_dai->id];
 240         struct atmel_pcm_dma_params *dma_params;
 241         int dir, dir_mask;
 242
 243         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
 244                 dir = 0;
 245         else
 246                 dir = 1;
 247
 248         dma_params = ssc_p->dma_params[dir];
 249
 250         if (dma_params != NULL) {
 251                 ssc_writel(ssc_p->ssc->regs, CR, dma_params->mask->ssc_disable);
 252                 pr_debug("atmel_ssc_shutdown: %s disabled SSC_SR=0x%08x\n",
 253                         (dir ? "receive" : "transmit"),
 254                         ssc_readl(ssc_p->ssc->regs, SR));
 255
 256                 dma_params->ssc = NULL;
 257                 dma_params->substream = NULL;
 258                 ssc_p->dma_params[dir] = NULL;
 259         }
 260
 261         dir_mask = 1 << dir;
 262
 263         spin_lock_irq(&ssc_p->lock);
 264         ssc_p->dir_mask &= ~dir_mask;
 265         if (!ssc_p->dir_mask) {
 266                 if (ssc_p->initialized) {
 267                         /* Shutdown the SSC clock. */
 268                         pr_debug("atmel_ssc_dau: Stopping clock\n");
 269                         clk_disable(ssc_p->ssc->clk);
 270
 271                         free_irq(ssc_p->ssc->irq, ssc_p);
 272                         ssc_p->initialized = 0;
 273                 }
 274
 275                 /* Reset the SSC */
 276                 ssc_writel(ssc_p->ssc->regs, CR, SSC_BIT(CR_SWRST));
 277                 /* Clear the SSC dividers */
 278                 ssc_p->cmr_div = ssc_p->tcmr_period = ssc_p->rcmr_period = 0;
 279         }
 280         spin_unlock_irq(&ssc_p->lock);
 281 }
 282
 283
 284 /*
 285  * Record the DAI format for use in hw_params().
 286  */
 287 static int atmel_ssc_set_dai_fmt(struct snd_soc_dai *cpu_dai,
 288                 unsigned int fmt)
 289 {
 290         struct atmel_ssc_info *ssc_p = &ssc_info[cpu_dai->id];
 291
 292         ssc_p->daifmt = fmt;
 293         return 0;
 294 }
 295
 296 /*
 297  * Record SSC clock dividers for use in hw_params().
 298  */
 299 static int atmel_ssc_set_dai_clkdiv(struct snd_soc_dai *cpu_dai,
 300         int div_id, int div)
 301 {
 302         struct atmel_ssc_info *ssc_p = &ssc_info[cpu_dai->id];
 303
 304         switch (div_id) {
 305         case ATMEL_SSC_CMR_DIV:
 306                 /*
 307                  * The same master clock divider is used for both
 308                  * transmit and receive, so if a value has already
 309                  * been set, it must match this value.
 310                  */
 311                 if (ssc_p->cmr_div == 0)
 312                         ssc_p->cmr_div = div;
 313                 else
 314                         if (div != ssc_p->cmr_div)
 315                                 return -EBUSY;
 316                 break;
 317
 318         case ATMEL_SSC_TCMR_PERIOD:
 319                 ssc_p->tcmr_period = div;
 320                 break;
 321
 322         case ATMEL_SSC_RCMR_PERIOD:
 323                 ssc_p->rcmr_period = div;
 324                 break;
 325
 326         default:
 327                 return -EINVAL;
 328         }
 329
 330         return 0;
 331 }
 332
 333 /*
 334  * Configure the SSC.
 335  */
 336 static int atmel_ssc_hw_params(struct snd_pcm_substream *substream,
 337         struct snd_pcm_hw_params *params,
 338         struct snd_soc_dai *dai)
 339 {
 340         struct snd_soc_pcm_runtime *rtd = snd_pcm_substream_chip(substream);
 341         int id = rtd->dai->cpu_dai->id;
 342         struct atmel_ssc_info *ssc_p = &ssc_info[id];
 343         struct atmel_pcm_dma_params *dma_params;
 344         int dir, channels, bits;
 345         u32 tfmr, rfmr, tcmr, rcmr;
 346         int start_event;
 347         int ret;
 348
 349         /*
 350          * Currently, there is only one set of dma params for
 351          * each direction.  If more are added, this code will
 352          * have to be changed to select the proper set.
 353          */
 354         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
 355                 dir = 0;
 356         else
 357                 dir = 1;
 358
 359         dma_params = &ssc_dma_params[id][dir];
 360         dma_params->ssc = ssc_p->ssc;
 361         dma_params->substream = substream;
 362
 363         ssc_p->dma_params[dir] = dma_params;
 364
 365         /*
 366          * The cpu_dai->dma_data field is only used to communicate the
 367          * appropriate DMA parameters to the pcm driver hw_params()
 368          * function.  It should not be used for other purposes
 369          * as it is common to all substreams.
 370          */
 371         rtd->dai->cpu_dai->dma_data = dma_params;
 372
 373         channels = params_channels(params);
 374
 375         /*
 376          * Determine sample size in bits and the PDC increment.
 377          */
 378         switch (params_format(params)) {
 379         case SNDRV_PCM_FORMAT_S8:
 380                 bits = 8;
 381                 dma_params->pdc_xfer_size = 1;
 382                 break;
 383         case SNDRV_PCM_FORMAT_S16_LE:
 384                 bits = 16;
 385                 dma_params->pdc_xfer_size = 2;
 386                 break;
 387         case SNDRV_PCM_FORMAT_S24_LE:
 388                 bits = 24;
 389                 dma_params->pdc_xfer_size = 4;
 390                 break;
 391         case SNDRV_PCM_FORMAT_S32_LE:
 392                 bits = 32;
 393                 dma_params->pdc_xfer_size = 4;
 394                 break;
 395         default:
 396                 printk(KERN_WARNING "atmel_ssc_dai: unsupported PCM format");
 397                 return -EINVAL;
 398         }
 399
 400         /*
 401          * The SSC only supports up to 16-bit samples in I2S format, due
 402          * to the size of the Frame Mode Register FSLEN field.
 403          */
 404         if ((ssc_p->daifmt & SND_SOC_DAIFMT_FORMAT_MASK) == SND_SOC_DAIFMT_I2S
 405                 && bits > 16) {
 406                 printk(KERN_WARNING
 407                                 "atmel_ssc_dai: sample size %d"
 408                                 "is too large for I2S\n", bits);
 409                 return -EINVAL;
 410         }
 411
 412         /*
 413          * Compute SSC register settings.
 414          */
 415         switch (ssc_p->daifmt
 416                 & (SND_SOC_DAIFMT_FORMAT_MASK | SND_SOC_DAIFMT_MASTER_MASK)) {
 417
 418         case SND_SOC_DAIFMT_I2S | SND_SOC_DAIFMT_CBS_CFS:
 419                 /*
 420                  * I2S format, SSC provides BCLK and LRC clocks.
 421                  *
 422                  * The SSC transmit and receive clocks are generated
 423                  * from the MCK divider, and the BCLK signal
 424                  * is output on the SSC TK line.
 425                  */
 426                 rcmr =    SSC_BF(RCMR_PERIOD, ssc_p->rcmr_period)
 427                         | SSC_BF(RCMR_STTDLY, START_DELAY)
 428                         | SSC_BF(RCMR_START, SSC_START_FALLING_RF)
 429                         | SSC_BF(RCMR_CKI, SSC_CKI_RISING)
 430                         | SSC_BF(RCMR_CKO, SSC_CKO_NONE)
 431                         | SSC_BF(RCMR_CKS, SSC_CKS_DIV);
 432
 433                 rfmr =    SSC_BF(RFMR_FSEDGE, SSC_FSEDGE_POSITIVE)
 434                         | SSC_BF(RFMR_FSOS, SSC_FSOS_NEGATIVE)
 435                         | SSC_BF(RFMR_FSLEN, (bits - 1))
 436                         | SSC_BF(RFMR_DATNB, (channels - 1))
 437                         | SSC_BIT(RFMR_MSBF)
 438                         | SSC_BF(RFMR_LOOP, 0)
 439                         | SSC_BF(RFMR_DATLEN, (bits - 1));
 440
 441                 tcmr =    SSC_BF(TCMR_PERIOD, ssc_p->tcmr_period)
 442                         | SSC_BF(TCMR_STTDLY, START_DELAY)
 443                         | SSC_BF(TCMR_START, SSC_START_FALLING_RF)
 444                         | SSC_BF(TCMR_CKI, SSC_CKI_FALLING)
 445                         | SSC_BF(TCMR_CKO, SSC_CKO_CONTINUOUS)
 446                         | SSC_BF(TCMR_CKS, SSC_CKS_DIV);
 447
 448                 tfmr =    SSC_BF(TFMR_FSEDGE, SSC_FSEDGE_POSITIVE)
 449                         | SSC_BF(TFMR_FSDEN, 0)
 450                         | SSC_BF(TFMR_FSOS, SSC_FSOS_NEGATIVE)
 451                         | SSC_BF(TFMR_FSLEN, (bits - 1))
 452                         | SSC_BF(TFMR_DATNB, (channels - 1))
 453                         | SSC_BIT(TFMR_MSBF)
 454                         | SSC_BF(TFMR_DATDEF, 0)
 455                         | SSC_BF(TFMR_DATLEN, (bits - 1));
 456                 break;
 457
 458         case SND_SOC_DAIFMT_I2S | SND_SOC_DAIFMT_CBM_CFM:
 459                 /*
 460                  * I2S format, CODEC supplies BCLK and LRC clocks.
 461                  *
 462                  * The SSC transmit clock is obtained from the BCLK signal on
 463                  * on the TK line, and the SSC receive clock is
 464                  * generated from the transmit clock.
 465                  *
 466                  *  For single channel data, one sample is transferred
 467                  * on the falling edge of the LRC clock.
 468                  * For two channel data, one sample is
 469                  * transferred on both edges of the LRC clock.
 470                  */
 471                 start_event = ((channels == 1)
 472                                 ? SSC_START_FALLING_RF
 473                                 : SSC_START_EDGE_RF);
 474
 475                 rcmr =    SSC_BF(RCMR_PERIOD, 0)
 476                         | SSC_BF(RCMR_STTDLY, START_DELAY)
 477                         | SSC_BF(RCMR_START, start_event)
 478                         | SSC_BF(RCMR_CKI, SSC_CKI_RISING)
 479                         | SSC_BF(RCMR_CKO, SSC_CKO_NONE)
 480                         | SSC_BF(RCMR_CKS, SSC_CKS_CLOCK);
 481
 482                 rfmr =    SSC_BF(RFMR_FSEDGE, SSC_FSEDGE_POSITIVE)
 483                         | SSC_BF(RFMR_FSOS, SSC_FSOS_NONE)
 484                         | SSC_BF(RFMR_FSLEN, 0)
 485                         | SSC_BF(RFMR_DATNB, 0)
 486                         | SSC_BIT(RFMR_MSBF)
 487                         | SSC_BF(RFMR_LOOP, 0)
 488                         | SSC_BF(RFMR_DATLEN, (bits - 1));
 489
 490                 tcmr =    SSC_BF(TCMR_PERIOD, 0)
 491                         | SSC_BF(TCMR_STTDLY, START_DELAY)
 492                         | SSC_BF(TCMR_START, start_event)
 493                         | SSC_BF(TCMR_CKI, SSC_CKI_FALLING)
 494                         | SSC_BF(TCMR_CKO, SSC_CKO_NONE)
 495                         | SSC_BF(TCMR_CKS, SSC_CKS_PIN);
 496
 497                 tfmr =    SSC_BF(TFMR_FSEDGE, SSC_FSEDGE_POSITIVE)
 498                         | SSC_BF(TFMR_FSDEN, 0)
 499                         | SSC_BF(TFMR_FSOS, SSC_FSOS_NONE)
 500                         | SSC_BF(TFMR_FSLEN, 0)
 501                         | SSC_BF(TFMR_DATNB, 0)
 502                         | SSC_BIT(TFMR_MSBF)
 503                         | SSC_BF(TFMR_DATDEF, 0)
 504                         | SSC_BF(TFMR_DATLEN, (bits - 1));
 505                 break;
 506
 507         case SND_SOC_DAIFMT_DSP_A | SND_SOC_DAIFMT_CBS_CFS:
 508                 /*
 509                  * DSP/PCM Mode A format, SSC provides BCLK and LRC clocks.
 510                  *
 511                  * The SSC transmit and receive clocks are generated from the
 512                  * MCK divider, and the BCLK signal is output
 513                  * on the SSC TK line.
 514                  */
 515                 rcmr =    SSC_BF(RCMR_PERIOD, ssc_p->rcmr_period)
 516                         | SSC_BF(RCMR_STTDLY, 1)
 517                         | SSC_BF(RCMR_START, SSC_START_RISING_RF)
 518                         | SSC_BF(RCMR_CKI, SSC_CKI_RISING)
 519                         | SSC_BF(RCMR_CKO, SSC_CKO_NONE)
 520                         | SSC_BF(RCMR_CKS, SSC_CKS_DIV);
 521
 522                 rfmr =    SSC_BF(RFMR_FSEDGE, SSC_FSEDGE_POSITIVE)
 523                         | SSC_BF(RFMR_FSOS, SSC_FSOS_POSITIVE)
 524                         | SSC_BF(RFMR_FSLEN, 0)
 525                         | SSC_BF(RFMR_DATNB, (channels - 1))
 526                         | SSC_BIT(RFMR_MSBF)
 527                         | SSC_BF(RFMR_LOOP, 0)
 528                         | SSC_BF(RFMR_DATLEN, (bits - 1));
 529
 530                 tcmr =    SSC_BF(TCMR_PERIOD, ssc_p->tcmr_period)
 531                         | SSC_BF(TCMR_STTDLY, 1)
 532                         | SSC_BF(TCMR_START, SSC_START_RISING_RF)
 533                         | SSC_BF(TCMR_CKI, SSC_CKI_RISING)
 534                         | SSC_BF(TCMR_CKO, SSC_CKO_CONTINUOUS)
 535                         | SSC_BF(TCMR_CKS, SSC_CKS_DIV);
 536
 537                 tfmr =    SSC_BF(TFMR_FSEDGE, SSC_FSEDGE_POSITIVE)
 538                         | SSC_BF(TFMR_FSDEN, 0)
 539                         | SSC_BF(TFMR_FSOS, SSC_FSOS_POSITIVE)
 540                         | SSC_BF(TFMR_FSLEN, 0)
 541                         | SSC_BF(TFMR_DATNB, (channels - 1))
 542                         | SSC_BIT(TFMR_MSBF)
 543                         | SSC_BF(TFMR_DATDEF, 0)
 544                         | SSC_BF(TFMR_DATLEN, (bits - 1));
 545                 break;
 546
 547         case SND_SOC_DAIFMT_DSP_A | SND_SOC_DAIFMT_CBM_CFM:
 548         default:
 549                 printk(KERN_WARNING "atmel_ssc_dai: unsupported DAI format 0x%x\n",
 550                         ssc_p->daifmt);
 551                 return -EINVAL;
 552                 break;
 553         }
 554         pr_debug("atmel_ssc_hw_params: "
 555                         "RCMR=%08x RFMR=%08x TCMR=%08x TFMR=%08x\n",
 556                         rcmr, rfmr, tcmr, tfmr);
 557
 558         if (!ssc_p->initialized) {
 559
 560                 /* Enable PMC peripheral clock for this SSC */
 561                 pr_debug("atmel_ssc_dai: Starting clock\n");
 562                 clk_enable(ssc_p->ssc->clk);
 563
 564                 /* Reset the SSC and its PDC registers */
 565                 ssc_writel(ssc_p->ssc->regs, CR, SSC_BIT(CR_SWRST));
 566
 567                 ssc_writel(ssc_p->ssc->regs, PDC_RPR, 0);
 568                 ssc_writel(ssc_p->ssc->regs, PDC_RCR, 0);
 569                 ssc_writel(ssc_p->ssc->regs, PDC_RNPR, 0);
 570                 ssc_writel(ssc_p->ssc->regs, PDC_RNCR, 0);
 571
 572                 ssc_writel(ssc_p->ssc->regs, PDC_TPR, 0);
 573                 ssc_writel(ssc_p->ssc->regs, PDC_TCR, 0);
 574                 ssc_writel(ssc_p->ssc->regs, PDC_TNPR, 0);
 575                 ssc_writel(ssc_p->ssc->regs, PDC_TNCR, 0);
 576
 577                 ret = request_irq(ssc_p->ssc->irq, atmel_ssc_interrupt, 0,
 578                                 ssc_p->name, ssc_p);
 579                 if (ret < 0) {
 580                         printk(KERN_WARNING
 581                                         "atmel_ssc_dai: request_irq failure\n");
 582                         pr_debug("Atmel_ssc_dai: Stoping clock\n");
 583                         clk_disable(ssc_p->ssc->clk);
 584                         return ret;
 585                 }
 586
 587                 ssc_p->initialized = 1;
 588         }
 589
 590         /* set SSC clock mode register */
 591         ssc_writel(ssc_p->ssc->regs, CMR, ssc_p->cmr_div);
 592
 593         /* set receive clock mode and format */
 594         ssc_writel(ssc_p->ssc->regs, RCMR, rcmr);
 595         ssc_writel(ssc_p->ssc->regs, RFMR, rfmr);
 596
 597         /* set transmit clock mode and format */
 598         ssc_writel(ssc_p->ssc->regs, TCMR, tcmr);
 599         ssc_writel(ssc_p->ssc->regs, TFMR, tfmr);
 600
 601         pr_debug("atmel_ssc_dai,hw_params: SSC initialized\n");
 602         return 0;
 603 }
 604
 605
 606 static int atmel_ssc_prepare(struct snd_pcm_substream *substream,
 607                              struct snd_soc_dai *dai)
 608 {
 609         struct snd_soc_pcm_runtime *rtd = snd_pcm_substream_chip(substream);
 610         struct atmel_ssc_info *ssc_p = &ssc_info[rtd->dai->cpu_dai->id];
 611         struct atmel_pcm_dma_params *dma_params;
 612         int dir;
 613
 614         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
 615                 dir = 0;
 616         else
 617                 dir = 1;
 618
 619         dma_params = ssc_p->dma_params[dir];
 620
 621         ssc_writel(ssc_p->ssc->regs, CR, dma_params->mask->ssc_enable);
 622
 623         pr_debug("%s enabled SSC_SR=0x%08x\n",
 624                         dir ? "receive" : "transmit",
 625                         ssc_readl(ssc_p->ssc->regs, SR));
 626         return 0;
 627 }
 628
 629
 630 #ifdef CONFIG_PM
 631 static int atmel_ssc_suspend(struct snd_soc_dai *cpu_dai)
 632 {
 633         struct atmel_ssc_info *ssc_p;
 634
 635         if (!cpu_dai->active)
 636                 return 0;
 637
 638         ssc_p = &ssc_info[cpu_dai->id];
 639
 640         /* Save the status register before disabling transmit and receive */
 641         ssc_p->ssc_state.ssc_sr = ssc_readl(ssc_p->ssc->regs, SR);
 642         ssc_writel(ssc_p->ssc->regs, CR, SSC_BIT(CR_TXDIS) | SSC_BIT(CR_RXDIS));
 643
 644         /* Save the current interrupt mask, then disable unmasked interrupts */
 645         ssc_p->ssc_state.ssc_imr = ssc_readl(ssc_p->ssc->regs, IMR);
 646         ssc_writel(ssc_p->ssc->regs, IDR, ssc_p->ssc_state.ssc_imr);
 647
 648         ssc_p->ssc_state.ssc_cmr = ssc_readl(ssc_p->ssc->regs, CMR);
 649         ssc_p->ssc_state.ssc_rcmr = ssc_readl(ssc_p->ssc->regs, RCMR);
 650         ssc_p->ssc_state.ssc_rfmr = ssc_readl(ssc_p->ssc->regs, RFMR);
 651         ssc_p->ssc_state.ssc_tcmr = ssc_readl(ssc_p->ssc->regs, TCMR);
 652         ssc_p->ssc_state.ssc_tfmr = ssc_readl(ssc_p->ssc->regs, TFMR);
 653
 654         return 0;
 655 }
 656
 657
 658
 659 static int atmel_ssc_resume(struct snd_soc_dai *cpu_dai)
 660 {
 661         struct atmel_ssc_info *ssc_p;
 662         u32 cr;
 663
 664         if (!cpu_dai->active)
 665                 return 0;
 666
 667         ssc_p = &ssc_info[cpu_dai->id];
 668
 669         /* restore SSC register settings */
 670         ssc_writel(ssc_p->ssc->regs, TFMR, ssc_p->ssc_state.ssc_tfmr);
 671         ssc_writel(ssc_p->ssc->regs, TCMR, ssc_p->ssc_state.ssc_tcmr);
 672         ssc_writel(ssc_p->ssc->regs, RFMR, ssc_p->ssc_state.ssc_rfmr);
 673         ssc_writel(ssc_p->ssc->regs, RCMR, ssc_p->ssc_state.ssc_rcmr);
 674         ssc_writel(ssc_p->ssc->regs, CMR, ssc_p->ssc_state.ssc_cmr);
 675
 676         /* re-enable interrupts */
 677         ssc_writel(ssc_p->ssc->regs, IER, ssc_p->ssc_state.ssc_imr);
 678
 679         /* Re-enable recieve and transmit as appropriate */
 680         cr = 0;
 681         cr |=
 682             (ssc_p->ssc_state.ssc_sr & SSC_BIT(SR_RXEN)) ? SSC_BIT(CR_RXEN) : 0;
 683         cr |=
 684             (ssc_p->ssc_state.ssc_sr & SSC_BIT(SR_TXEN)) ? SSC_BIT(CR_TXEN) : 0;
 685         ssc_writel(ssc_p->ssc->regs, CR, cr);
 686
 687         return 0;
 688 }
 689 #else /* CONFIG_PM */
 690 #  define atmel_ssc_suspend     NULL
 691 #  define atmel_ssc_resume      NULL
 692 #endif /* CONFIG_PM */
 693
 694
 695 #define ATMEL_SSC_RATES (SNDRV_PCM_RATE_8000_96000)
 696
 697 #define ATMEL_SSC_FORMATS (SNDRV_PCM_FMTBIT_S8     | SNDRV_PCM_FMTBIT_S16_LE |\
 698                           SNDRV_PCM_FMTBIT_S24_LE | SNDRV_PCM_FMTBIT_S32_LE)
 699
 700 struct snd_soc_dai atmel_ssc_dai[NUM_SSC_DEVICES] = {
 701         {       .name = "atmel-ssc0",
 702                 .id = 0,
 703                 .suspend = atmel_ssc_suspend,
 704                 .resume = atmel_ssc_resume,
 705                 .playback = {
 706                         .channels_min = 1,
 707                         .channels_max = 2,
 708                         .rates = ATMEL_SSC_RATES,
 709                         .formats = ATMEL_SSC_FORMATS,},
 710                 .capture = {
 711                         .channels_min = 1,
 712                         .channels_max = 2,
 713                         .rates = ATMEL_SSC_RATES,
 714                         .formats = ATMEL_SSC_FORMATS,},
 715                 .ops = {
 716                         .startup = atmel_ssc_startup,
 717                         .shutdown = atmel_ssc_shutdown,
 718                         .prepare = atmel_ssc_prepare,
 719                         .hw_params = atmel_ssc_hw_params,
 720                         .set_fmt = atmel_ssc_set_dai_fmt,
 721                         .set_clkdiv = atmel_ssc_set_dai_clkdiv,},
 722                 .private_data = &ssc_info[0],
 723         },
 724 #if NUM_SSC_DEVICES == 3
 725         {       .name = "atmel-ssc1",
 726                 .id = 1,
 727                 .suspend = atmel_ssc_suspend,
 728                 .resume = atmel_ssc_resume,
 729                 .playback = {
 730                         .channels_min = 1,
 731                         .channels_max = 2,
 732                         .rates = ATMEL_SSC_RATES,
 733                         .formats = ATMEL_SSC_FORMATS,},
 734                 .capture = {
 735                         .channels_min = 1,
 736                         .channels_max = 2,
 737                         .rates = ATMEL_SSC_RATES,
 738                         .formats = ATMEL_SSC_FORMATS,},
 739                 .ops = {
 740                         .startup = atmel_ssc_startup,
 741                         .shutdown = atmel_ssc_shutdown,
 742                         .prepare = atmel_ssc_prepare,
 743                         .hw_params = atmel_ssc_hw_params,
 744                         .set_fmt = atmel_ssc_set_dai_fmt,
 745                         .set_clkdiv = atmel_ssc_set_dai_clkdiv,},
 746                 .private_data = &ssc_info[1],
 747         },
 748         {       .name = "atmel-ssc2",
 749                 .id = 2,
 750                 .suspend = atmel_ssc_suspend,
 751                 .resume = atmel_ssc_resume,
 752                 .playback = {
 753                         .channels_min = 1,
 754                         .channels_max = 2,
 755                         .rates = ATMEL_SSC_RATES,
 756                         .formats = ATMEL_SSC_FORMATS,},
 757                 .capture = {
 758                         .channels_min = 1,
 759                         .channels_max = 2,
 760                         .rates = ATMEL_SSC_RATES,
 761                         .formats = ATMEL_SSC_FORMATS,},
 762                 .ops = {
 763                         .startup = atmel_ssc_startup,
 764                         .shutdown = atmel_ssc_shutdown,
 765                         .prepare = atmel_ssc_prepare,
 766                         .hw_params = atmel_ssc_hw_params,
 767                         .set_fmt = atmel_ssc_set_dai_fmt,
 768                         .set_clkdiv = atmel_ssc_set_dai_clkdiv,},
 769                 .private_data = &ssc_info[2],
 770         },
 771 #endif
 772 };
 773 EXPORT_SYMBOL_GPL(atmel_ssc_dai);
 774
 775 static int __init atmel_ssc_modinit(void)
 776 {
 777         return snd_soc_register_dais(atmel_ssc_dai, ARRAY_SIZE(atmel_ssc_dai));
 778 }
 779 module_init(atmel_ssc_modinit);
 780
 781 static void __exit atmel_ssc_modexit(void)
 782 {
 783         snd_soc_unregister_dais(atmel_ssc_dai, ARRAY_SIZE(atmel_ssc_dai));
 784 }
 785 module_exit(atmel_ssc_modexit);
 786
 787 /* Module information */
 788 MODULE_AUTHOR("Sedji Gaouaou, sedji.gaouaou@atmel.com, www.atmel.com");
 789 MODULE_DESCRIPTION("ATMEL SSC ASoC Interface");
 790 MODULE_LICENSE("GPL");