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Linux/sound/soc/atmel/atmel_ssc_dai.c

  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 "atmel-pcm.h"
 46 #include "atmel_ssc_dai.h"
 47 
 48 
 49 #define NUM_SSC_DEVICES         3
 50 
 51 /*
 52  * SSC PDC registers required by the PCM DMA engine.
 53  */
 54 static struct atmel_pdc_regs pdc_tx_reg = {
 55         .xpr            = ATMEL_PDC_TPR,
 56         .xcr            = ATMEL_PDC_TCR,
 57         .xnpr           = ATMEL_PDC_TNPR,
 58         .xncr           = ATMEL_PDC_TNCR,
 59 };
 60 
 61 static struct atmel_pdc_regs pdc_rx_reg = {
 62         .xpr            = ATMEL_PDC_RPR,
 63         .xcr            = ATMEL_PDC_RCR,
 64         .xnpr           = ATMEL_PDC_RNPR,
 65         .xncr           = ATMEL_PDC_RNCR,
 66 };
 67 
 68 /*
 69  * SSC & PDC status bits for transmit and receive.
 70  */
 71 static struct atmel_ssc_mask ssc_tx_mask = {
 72         .ssc_enable     = SSC_BIT(CR_TXEN),
 73         .ssc_disable    = SSC_BIT(CR_TXDIS),
 74         .ssc_endx       = SSC_BIT(SR_ENDTX),
 75         .ssc_endbuf     = SSC_BIT(SR_TXBUFE),
 76         .ssc_error      = SSC_BIT(SR_OVRUN),
 77         .pdc_enable     = ATMEL_PDC_TXTEN,
 78         .pdc_disable    = ATMEL_PDC_TXTDIS,
 79 };
 80 
 81 static struct atmel_ssc_mask ssc_rx_mask = {
 82         .ssc_enable     = SSC_BIT(CR_RXEN),
 83         .ssc_disable    = SSC_BIT(CR_RXDIS),
 84         .ssc_endx       = SSC_BIT(SR_ENDRX),
 85         .ssc_endbuf     = SSC_BIT(SR_RXBUFF),
 86         .ssc_error      = SSC_BIT(SR_OVRUN),
 87         .pdc_enable     = ATMEL_PDC_RXTEN,
 88         .pdc_disable    = ATMEL_PDC_RXTDIS,
 89 };
 90 
 91 
 92 /*
 93  * DMA parameters.
 94  */
 95 static struct atmel_pcm_dma_params ssc_dma_params[NUM_SSC_DEVICES][2] = {
 96         {{
 97         .name           = "SSC0 PCM out",
 98         .pdc            = &pdc_tx_reg,
 99         .mask           = &ssc_tx_mask,
100         },
101         {
102         .name           = "SSC0 PCM in",
103         .pdc            = &pdc_rx_reg,
104         .mask           = &ssc_rx_mask,
105         } },
106         {{
107         .name           = "SSC1 PCM out",
108         .pdc            = &pdc_tx_reg,
109         .mask           = &ssc_tx_mask,
110         },
111         {
112         .name           = "SSC1 PCM in",
113         .pdc            = &pdc_rx_reg,
114         .mask           = &ssc_rx_mask,
115         } },
116         {{
117         .name           = "SSC2 PCM out",
118         .pdc            = &pdc_tx_reg,
119         .mask           = &ssc_tx_mask,
120         },
121         {
122         .name           = "SSC2 PCM in",
123         .pdc            = &pdc_rx_reg,
124         .mask           = &ssc_rx_mask,
125         } },
126 };
127 
128 
129 static struct atmel_ssc_info ssc_info[NUM_SSC_DEVICES] = {
130         {
131         .name           = "ssc0",
132         .lock           = __SPIN_LOCK_UNLOCKED(ssc_info[0].lock),
133         .dir_mask       = SSC_DIR_MASK_UNUSED,
134         .initialized    = 0,
135         },
136         {
137         .name           = "ssc1",
138         .lock           = __SPIN_LOCK_UNLOCKED(ssc_info[1].lock),
139         .dir_mask       = SSC_DIR_MASK_UNUSED,
140         .initialized    = 0,
141         },
142         {
143         .name           = "ssc2",
144         .lock           = __SPIN_LOCK_UNLOCKED(ssc_info[2].lock),
145         .dir_mask       = SSC_DIR_MASK_UNUSED,
146         .initialized    = 0,
147         },
148 };
149 
150 
151 /*
152  * SSC interrupt handler.  Passes PDC interrupts to the DMA
153  * interrupt handler in the PCM driver.
154  */
155 static irqreturn_t atmel_ssc_interrupt(int irq, void *dev_id)
156 {
157         struct atmel_ssc_info *ssc_p = dev_id;
158         struct atmel_pcm_dma_params *dma_params;
159         u32 ssc_sr;
160         u32 ssc_substream_mask;
161         int i;
162 
163         ssc_sr = (unsigned long)ssc_readl(ssc_p->ssc->regs, SR)
164                         & (unsigned long)ssc_readl(ssc_p->ssc->regs, IMR);
165 
166         /*
167          * Loop through the substreams attached to this SSC.  If
168          * a DMA-related interrupt occurred on that substream, call
169          * the DMA interrupt handler function, if one has been
170          * registered in the dma_params structure by the PCM driver.
171          */
172         for (i = 0; i < ARRAY_SIZE(ssc_p->dma_params); i++) {
173                 dma_params = ssc_p->dma_params[i];
174 
175                 if ((dma_params != NULL) &&
176                         (dma_params->dma_intr_handler != NULL)) {
177                         ssc_substream_mask = (dma_params->mask->ssc_endx |
178                                         dma_params->mask->ssc_endbuf);
179                         if (ssc_sr & ssc_substream_mask) {
180                                 dma_params->dma_intr_handler(ssc_sr,
181                                                 dma_params->
182                                                 substream);
183                         }
184                 }
185         }
186 
187         return IRQ_HANDLED;
188 }
189 
190 
191 /*-------------------------------------------------------------------------*\
192  * DAI functions
193 \*-------------------------------------------------------------------------*/
194 /*
195  * Startup.  Only that one substream allowed in each direction.
196  */
197 static int atmel_ssc_startup(struct snd_pcm_substream *substream,
198                              struct snd_soc_dai *dai)
199 {
200         struct atmel_ssc_info *ssc_p = &ssc_info[dai->id];
201         struct atmel_pcm_dma_params *dma_params;
202         int dir, dir_mask;
203 
204         pr_debug("atmel_ssc_startup: SSC_SR=0x%u\n",
205                 ssc_readl(ssc_p->ssc->regs, SR));
206 
207         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
208                 dir = 0;
209                 dir_mask = SSC_DIR_MASK_PLAYBACK;
210         } else {
211                 dir = 1;
212                 dir_mask = SSC_DIR_MASK_CAPTURE;
213         }
214 
215         dma_params = &ssc_dma_params[dai->id][dir];
216         dma_params->ssc = ssc_p->ssc;
217         dma_params->substream = substream;
218 
219         ssc_p->dma_params[dir] = dma_params;
220 
221         snd_soc_dai_set_dma_data(dai, substream, dma_params);
222 
223         spin_lock_irq(&ssc_p->lock);
224         if (ssc_p->dir_mask & dir_mask) {
225                 spin_unlock_irq(&ssc_p->lock);
226                 return -EBUSY;
227         }
228         ssc_p->dir_mask |= dir_mask;
229         spin_unlock_irq(&ssc_p->lock);
230 
231         return 0;
232 }
233 
234 /*
235  * Shutdown.  Clear DMA parameters and shutdown the SSC if there
236  * are no other substreams open.
237  */
238 static void atmel_ssc_shutdown(struct snd_pcm_substream *substream,
239                                struct snd_soc_dai *dai)
240 {
241         struct atmel_ssc_info *ssc_p = &ssc_info[dai->id];
242         struct atmel_pcm_dma_params *dma_params;
243         int dir, dir_mask;
244 
245         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
246                 dir = 0;
247         else
248                 dir = 1;
249 
250         dma_params = ssc_p->dma_params[dir];
251 
252         if (dma_params != NULL) {
253                 ssc_writel(ssc_p->ssc->regs, CR, dma_params->mask->ssc_disable);
254                 pr_debug("atmel_ssc_shutdown: %s disabled SSC_SR=0x%08x\n",
255                         (dir ? "receive" : "transmit"),
256                         ssc_readl(ssc_p->ssc->regs, SR));
257 
258                 dma_params->ssc = NULL;
259                 dma_params->substream = NULL;
260                 ssc_p->dma_params[dir] = NULL;
261         }
262 
263         dir_mask = 1 << dir;
264 
265         spin_lock_irq(&ssc_p->lock);
266         ssc_p->dir_mask &= ~dir_mask;
267         if (!ssc_p->dir_mask) {
268                 if (ssc_p->initialized) {
269                         /* Shutdown the SSC clock. */
270                         pr_debug("atmel_ssc_dau: Stopping clock\n");
271                         clk_disable(ssc_p->ssc->clk);
272 
273                         free_irq(ssc_p->ssc->irq, ssc_p);
274                         ssc_p->initialized = 0;
275                 }
276 
277                 /* Reset the SSC */
278                 ssc_writel(ssc_p->ssc->regs, CR, SSC_BIT(CR_SWRST));
279                 /* Clear the SSC dividers */
280                 ssc_p->cmr_div = ssc_p->tcmr_period = ssc_p->rcmr_period = 0;
281         }
282         spin_unlock_irq(&ssc_p->lock);
283 }
284 
285 
286 /*
287  * Record the DAI format for use in hw_params().
288  */
289 static int atmel_ssc_set_dai_fmt(struct snd_soc_dai *cpu_dai,
290                 unsigned int fmt)
291 {
292         struct atmel_ssc_info *ssc_p = &ssc_info[cpu_dai->id];
293 
294         ssc_p->daifmt = fmt;
295         return 0;
296 }
297 
298 /*
299  * Record SSC clock dividers for use in hw_params().
300  */
301 static int atmel_ssc_set_dai_clkdiv(struct snd_soc_dai *cpu_dai,
302         int div_id, int div)
303 {
304         struct atmel_ssc_info *ssc_p = &ssc_info[cpu_dai->id];
305 
306         switch (div_id) {
307         case ATMEL_SSC_CMR_DIV:
308                 /*
309                  * The same master clock divider is used for both
310                  * transmit and receive, so if a value has already
311                  * been set, it must match this value.
312                  */
313                 if (ssc_p->cmr_div == 0)
314                         ssc_p->cmr_div = div;
315                 else
316                         if (div != ssc_p->cmr_div)
317                                 return -EBUSY;
318                 break;
319 
320         case ATMEL_SSC_TCMR_PERIOD:
321                 ssc_p->tcmr_period = div;
322                 break;
323 
324         case ATMEL_SSC_RCMR_PERIOD:
325                 ssc_p->rcmr_period = div;
326                 break;
327 
328         default:
329                 return -EINVAL;
330         }
331 
332         return 0;
333 }
334 
335 /*
336  * Configure the SSC.
337  */
338 static int atmel_ssc_hw_params(struct snd_pcm_substream *substream,
339         struct snd_pcm_hw_params *params,
340         struct snd_soc_dai *dai)
341 {
342         int id = dai->id;
343         struct atmel_ssc_info *ssc_p = &ssc_info[id];
344         struct atmel_pcm_dma_params *dma_params;
345         int dir, channels, bits;
346         u32 tfmr, rfmr, tcmr, rcmr;
347         int start_event;
348         int ret;
349 
350         /*
351          * Currently, there is only one set of dma params for
352          * each direction.  If more are added, this code will
353          * have to be changed to select the proper set.
354          */
355         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
356                 dir = 0;
357         else
358                 dir = 1;
359 
360         dma_params = ssc_p->dma_params[dir];
361 
362         channels = params_channels(params);
363 
364         /*
365          * Determine sample size in bits and the PDC increment.
366          */
367         switch (params_format(params)) {
368         case SNDRV_PCM_FORMAT_S8:
369                 bits = 8;
370                 dma_params->pdc_xfer_size = 1;
371                 break;
372         case SNDRV_PCM_FORMAT_S16_LE:
373                 bits = 16;
374                 dma_params->pdc_xfer_size = 2;
375                 break;
376         case SNDRV_PCM_FORMAT_S24_LE:
377                 bits = 24;
378                 dma_params->pdc_xfer_size = 4;
379                 break;
380         case SNDRV_PCM_FORMAT_S32_LE:
381                 bits = 32;
382                 dma_params->pdc_xfer_size = 4;
383                 break;
384         default:
385                 printk(KERN_WARNING "atmel_ssc_dai: unsupported PCM format");
386                 return -EINVAL;
387         }
388 
389         /*
390          * The SSC only supports up to 16-bit samples in I2S format, due
391          * to the size of the Frame Mode Register FSLEN field.
392          */
393         if ((ssc_p->daifmt & SND_SOC_DAIFMT_FORMAT_MASK) == SND_SOC_DAIFMT_I2S
394                 && bits > 16) {
395                 printk(KERN_WARNING
396                                 "atmel_ssc_dai: sample size %d "
397                                 "is too large for I2S\n", bits);
398                 return -EINVAL;
399         }
400 
401         /*
402          * Compute SSC register settings.
403          */
404         switch (ssc_p->daifmt
405                 & (SND_SOC_DAIFMT_FORMAT_MASK | SND_SOC_DAIFMT_MASTER_MASK)) {
406 
407         case SND_SOC_DAIFMT_I2S | SND_SOC_DAIFMT_CBS_CFS:
408                 /*
409                  * I2S format, SSC provides BCLK and LRC clocks.
410                  *
411                  * The SSC transmit and receive clocks are generated
412                  * from the MCK divider, and the BCLK signal
413                  * is output on the SSC TK line.
414                  */
415                 rcmr =    SSC_BF(RCMR_PERIOD, ssc_p->rcmr_period)
416                         | SSC_BF(RCMR_STTDLY, START_DELAY)
417                         | SSC_BF(RCMR_START, SSC_START_FALLING_RF)
418                         | SSC_BF(RCMR_CKI, SSC_CKI_RISING)
419                         | SSC_BF(RCMR_CKO, SSC_CKO_NONE)
420                         | SSC_BF(RCMR_CKS, SSC_CKS_DIV);
421 
422                 rfmr =    SSC_BF(RFMR_FSEDGE, SSC_FSEDGE_POSITIVE)
423                         | SSC_BF(RFMR_FSOS, SSC_FSOS_NEGATIVE)
424                         | SSC_BF(RFMR_FSLEN, (bits - 1))
425                         | SSC_BF(RFMR_DATNB, (channels - 1))
426                         | SSC_BIT(RFMR_MSBF)
427                         | SSC_BF(RFMR_LOOP, 0)
428                         | SSC_BF(RFMR_DATLEN, (bits - 1));
429 
430                 tcmr =    SSC_BF(TCMR_PERIOD, ssc_p->tcmr_period)
431                         | SSC_BF(TCMR_STTDLY, START_DELAY)
432                         | SSC_BF(TCMR_START, SSC_START_FALLING_RF)
433                         | SSC_BF(TCMR_CKI, SSC_CKI_FALLING)
434                         | SSC_BF(TCMR_CKO, SSC_CKO_CONTINUOUS)
435                         | SSC_BF(TCMR_CKS, SSC_CKS_DIV);
436 
437                 tfmr =    SSC_BF(TFMR_FSEDGE, SSC_FSEDGE_POSITIVE)
438                         | SSC_BF(TFMR_FSDEN, 0)
439                         | SSC_BF(TFMR_FSOS, SSC_FSOS_NEGATIVE)
440                         | SSC_BF(TFMR_FSLEN, (bits - 1))
441                         | SSC_BF(TFMR_DATNB, (channels - 1))
442                         | SSC_BIT(TFMR_MSBF)
443                         | SSC_BF(TFMR_DATDEF, 0)
444                         | SSC_BF(TFMR_DATLEN, (bits - 1));
445                 break;
446 
447         case SND_SOC_DAIFMT_I2S | SND_SOC_DAIFMT_CBM_CFM:
448                 /*
449                  * I2S format, CODEC supplies BCLK and LRC clocks.
450                  *
451                  * The SSC transmit clock is obtained from the BCLK signal on
452                  * on the TK line, and the SSC receive clock is
453                  * generated from the transmit clock.
454                  *
455                  *  For single channel data, one sample is transferred
456                  * on the falling edge of the LRC clock.
457                  * For two channel data, one sample is
458                  * transferred on both edges of the LRC clock.
459                  */
460                 start_event = ((channels == 1)
461                                 ? SSC_START_FALLING_RF
462                                 : SSC_START_EDGE_RF);
463 
464                 rcmr =    SSC_BF(RCMR_PERIOD, 0)
465                         | SSC_BF(RCMR_STTDLY, START_DELAY)
466                         | SSC_BF(RCMR_START, start_event)
467                         | SSC_BF(RCMR_CKI, SSC_CKI_RISING)
468                         | SSC_BF(RCMR_CKO, SSC_CKO_NONE)
469                         | SSC_BF(RCMR_CKS, SSC_CKS_CLOCK);
470 
471                 rfmr =    SSC_BF(RFMR_FSEDGE, SSC_FSEDGE_POSITIVE)
472                         | SSC_BF(RFMR_FSOS, SSC_FSOS_NONE)
473                         | SSC_BF(RFMR_FSLEN, 0)
474                         | SSC_BF(RFMR_DATNB, 0)
475                         | SSC_BIT(RFMR_MSBF)
476                         | SSC_BF(RFMR_LOOP, 0)
477                         | SSC_BF(RFMR_DATLEN, (bits - 1));
478 
479                 tcmr =    SSC_BF(TCMR_PERIOD, 0)
480                         | SSC_BF(TCMR_STTDLY, START_DELAY)
481                         | SSC_BF(TCMR_START, start_event)
482                         | SSC_BF(TCMR_CKI, SSC_CKI_FALLING)
483                         | SSC_BF(TCMR_CKO, SSC_CKO_NONE)
484                         | SSC_BF(TCMR_CKS, SSC_CKS_PIN);
485 
486                 tfmr =    SSC_BF(TFMR_FSEDGE, SSC_FSEDGE_POSITIVE)
487                         | SSC_BF(TFMR_FSDEN, 0)
488                         | SSC_BF(TFMR_FSOS, SSC_FSOS_NONE)
489                         | SSC_BF(TFMR_FSLEN, 0)
490                         | SSC_BF(TFMR_DATNB, 0)
491                         | SSC_BIT(TFMR_MSBF)
492                         | SSC_BF(TFMR_DATDEF, 0)
493                         | SSC_BF(TFMR_DATLEN, (bits - 1));
494                 break;
495 
496         case SND_SOC_DAIFMT_DSP_A | SND_SOC_DAIFMT_CBS_CFS:
497                 /*
498                  * DSP/PCM Mode A format, SSC provides BCLK and LRC clocks.
499                  *
500                  * The SSC transmit and receive clocks are generated from the
501                  * MCK divider, and the BCLK signal is output
502                  * on the SSC TK line.
503                  */
504                 rcmr =    SSC_BF(RCMR_PERIOD, ssc_p->rcmr_period)
505                         | SSC_BF(RCMR_STTDLY, 1)
506                         | SSC_BF(RCMR_START, SSC_START_RISING_RF)
507                         | SSC_BF(RCMR_CKI, SSC_CKI_RISING)
508                         | SSC_BF(RCMR_CKO, SSC_CKO_NONE)
509                         | SSC_BF(RCMR_CKS, SSC_CKS_DIV);
510 
511                 rfmr =    SSC_BF(RFMR_FSEDGE, SSC_FSEDGE_POSITIVE)
512                         | SSC_BF(RFMR_FSOS, SSC_FSOS_POSITIVE)
513                         | SSC_BF(RFMR_FSLEN, 0)
514                         | SSC_BF(RFMR_DATNB, (channels - 1))
515                         | SSC_BIT(RFMR_MSBF)
516                         | SSC_BF(RFMR_LOOP, 0)
517                         | SSC_BF(RFMR_DATLEN, (bits - 1));
518 
519                 tcmr =    SSC_BF(TCMR_PERIOD, ssc_p->tcmr_period)
520                         | SSC_BF(TCMR_STTDLY, 1)
521                         | SSC_BF(TCMR_START, SSC_START_RISING_RF)
522                         | SSC_BF(TCMR_CKI, SSC_CKI_RISING)
523                         | SSC_BF(TCMR_CKO, SSC_CKO_CONTINUOUS)
524                         | SSC_BF(TCMR_CKS, SSC_CKS_DIV);
525 
526                 tfmr =    SSC_BF(TFMR_FSEDGE, SSC_FSEDGE_POSITIVE)
527                         | SSC_BF(TFMR_FSDEN, 0)
528                         | SSC_BF(TFMR_FSOS, SSC_FSOS_POSITIVE)
529                         | SSC_BF(TFMR_FSLEN, 0)
530                         | SSC_BF(TFMR_DATNB, (channels - 1))
531                         | SSC_BIT(TFMR_MSBF)
532                         | SSC_BF(TFMR_DATDEF, 0)
533                         | SSC_BF(TFMR_DATLEN, (bits - 1));
534                 break;
535 
536         case SND_SOC_DAIFMT_DSP_A | SND_SOC_DAIFMT_CBM_CFM:
537                 /*
538                  * DSP/PCM Mode A format, CODEC supplies BCLK and LRC clocks.
539                  *
540                  * The SSC transmit clock is obtained from the BCLK signal on
541                  * on the TK line, and the SSC receive clock is
542                  * generated from the transmit clock.
543                  *
544                  * Data is transferred on first BCLK after LRC pulse rising
545                  * edge.If stereo, the right channel data is contiguous with
546                  * the left channel data.
547                  */
548                 rcmr =    SSC_BF(RCMR_PERIOD, 0)
549                         | SSC_BF(RCMR_STTDLY, START_DELAY)
550                         | SSC_BF(RCMR_START, SSC_START_RISING_RF)
551                         | SSC_BF(RCMR_CKI, SSC_CKI_RISING)
552                         | SSC_BF(RCMR_CKO, SSC_CKO_NONE)
553                         | SSC_BF(RCMR_CKS, SSC_CKS_PIN);
554 
555                 rfmr =    SSC_BF(RFMR_FSEDGE, SSC_FSEDGE_POSITIVE)
556                         | SSC_BF(RFMR_FSOS, SSC_FSOS_NONE)
557                         | SSC_BF(RFMR_FSLEN, 0)
558                         | SSC_BF(RFMR_DATNB, (channels - 1))
559                         | SSC_BIT(RFMR_MSBF)
560                         | SSC_BF(RFMR_LOOP, 0)
561                         | SSC_BF(RFMR_DATLEN, (bits - 1));
562 
563                 tcmr =    SSC_BF(TCMR_PERIOD, 0)
564                         | SSC_BF(TCMR_STTDLY, START_DELAY)
565                         | SSC_BF(TCMR_START, SSC_START_RISING_RF)
566                         | SSC_BF(TCMR_CKI, SSC_CKI_FALLING)
567                         | SSC_BF(TCMR_CKO, SSC_CKO_NONE)
568                         | SSC_BF(TCMR_CKS, SSC_CKS_PIN);
569 
570                 tfmr =    SSC_BF(TFMR_FSEDGE, SSC_FSEDGE_POSITIVE)
571                         | SSC_BF(TFMR_FSDEN, 0)
572                         | SSC_BF(TFMR_FSOS, SSC_FSOS_NONE)
573                         | SSC_BF(TFMR_FSLEN, 0)
574                         | SSC_BF(TFMR_DATNB, (channels - 1))
575                         | SSC_BIT(TFMR_MSBF)
576                         | SSC_BF(TFMR_DATDEF, 0)
577                         | SSC_BF(TFMR_DATLEN, (bits - 1));
578                 break;
579 
580         default:
581                 printk(KERN_WARNING "atmel_ssc_dai: unsupported DAI format 0x%x\n",
582                         ssc_p->daifmt);
583                 return -EINVAL;
584         }
585         pr_debug("atmel_ssc_hw_params: "
586                         "RCMR=%08x RFMR=%08x TCMR=%08x TFMR=%08x\n",
587                         rcmr, rfmr, tcmr, tfmr);
588 
589         if (!ssc_p->initialized) {
590 
591                 /* Enable PMC peripheral clock for this SSC */
592                 pr_debug("atmel_ssc_dai: Starting clock\n");
593                 clk_enable(ssc_p->ssc->clk);
594 
595                 /* Reset the SSC and its PDC registers */
596                 ssc_writel(ssc_p->ssc->regs, CR, SSC_BIT(CR_SWRST));
597 
598                 ssc_writel(ssc_p->ssc->regs, PDC_RPR, 0);
599                 ssc_writel(ssc_p->ssc->regs, PDC_RCR, 0);
600                 ssc_writel(ssc_p->ssc->regs, PDC_RNPR, 0);
601                 ssc_writel(ssc_p->ssc->regs, PDC_RNCR, 0);
602 
603                 ssc_writel(ssc_p->ssc->regs, PDC_TPR, 0);
604                 ssc_writel(ssc_p->ssc->regs, PDC_TCR, 0);
605                 ssc_writel(ssc_p->ssc->regs, PDC_TNPR, 0);
606                 ssc_writel(ssc_p->ssc->regs, PDC_TNCR, 0);
607 
608                 ret = request_irq(ssc_p->ssc->irq, atmel_ssc_interrupt, 0,
609                                 ssc_p->name, ssc_p);
610                 if (ret < 0) {
611                         printk(KERN_WARNING
612                                         "atmel_ssc_dai: request_irq failure\n");
613                         pr_debug("Atmel_ssc_dai: Stoping clock\n");
614                         clk_disable(ssc_p->ssc->clk);
615                         return ret;
616                 }
617 
618                 ssc_p->initialized = 1;
619         }
620 
621         /* set SSC clock mode register */
622         ssc_writel(ssc_p->ssc->regs, CMR, ssc_p->cmr_div);
623 
624         /* set receive clock mode and format */
625         ssc_writel(ssc_p->ssc->regs, RCMR, rcmr);
626         ssc_writel(ssc_p->ssc->regs, RFMR, rfmr);
627 
628         /* set transmit clock mode and format */
629         ssc_writel(ssc_p->ssc->regs, TCMR, tcmr);
630         ssc_writel(ssc_p->ssc->regs, TFMR, tfmr);
631 
632         pr_debug("atmel_ssc_dai,hw_params: SSC initialized\n");
633         return 0;
634 }
635 
636 
637 static int atmel_ssc_prepare(struct snd_pcm_substream *substream,
638                              struct snd_soc_dai *dai)
639 {
640         struct atmel_ssc_info *ssc_p = &ssc_info[dai->id];
641         struct atmel_pcm_dma_params *dma_params;
642         int dir;
643 
644         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
645                 dir = 0;
646         else
647                 dir = 1;
648 
649         dma_params = ssc_p->dma_params[dir];
650 
651         ssc_writel(ssc_p->ssc->regs, CR, dma_params->mask->ssc_disable);
652         ssc_writel(ssc_p->ssc->regs, IDR, dma_params->mask->ssc_error);
653 
654         pr_debug("%s enabled SSC_SR=0x%08x\n",
655                         dir ? "receive" : "transmit",
656                         ssc_readl(ssc_p->ssc->regs, SR));
657         return 0;
658 }
659 
660 static int atmel_ssc_trigger(struct snd_pcm_substream *substream,
661                              int cmd, struct snd_soc_dai *dai)
662 {
663         struct atmel_ssc_info *ssc_p = &ssc_info[dai->id];
664         struct atmel_pcm_dma_params *dma_params;
665         int dir;
666 
667         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
668                 dir = 0;
669         else
670                 dir = 1;
671 
672         dma_params = ssc_p->dma_params[dir];
673 
674         switch (cmd) {
675         case SNDRV_PCM_TRIGGER_START:
676         case SNDRV_PCM_TRIGGER_RESUME:
677         case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
678                 ssc_writel(ssc_p->ssc->regs, CR, dma_params->mask->ssc_enable);
679                 break;
680         default:
681                 ssc_writel(ssc_p->ssc->regs, CR, dma_params->mask->ssc_disable);
682                 break;
683         }
684 
685         return 0;
686 }
687 
688 #ifdef CONFIG_PM
689 static int atmel_ssc_suspend(struct snd_soc_dai *cpu_dai)
690 {
691         struct atmel_ssc_info *ssc_p;
692 
693         if (!cpu_dai->active)
694                 return 0;
695 
696         ssc_p = &ssc_info[cpu_dai->id];
697 
698         /* Save the status register before disabling transmit and receive */
699         ssc_p->ssc_state.ssc_sr = ssc_readl(ssc_p->ssc->regs, SR);
700         ssc_writel(ssc_p->ssc->regs, CR, SSC_BIT(CR_TXDIS) | SSC_BIT(CR_RXDIS));
701 
702         /* Save the current interrupt mask, then disable unmasked interrupts */
703         ssc_p->ssc_state.ssc_imr = ssc_readl(ssc_p->ssc->regs, IMR);
704         ssc_writel(ssc_p->ssc->regs, IDR, ssc_p->ssc_state.ssc_imr);
705 
706         ssc_p->ssc_state.ssc_cmr = ssc_readl(ssc_p->ssc->regs, CMR);
707         ssc_p->ssc_state.ssc_rcmr = ssc_readl(ssc_p->ssc->regs, RCMR);
708         ssc_p->ssc_state.ssc_rfmr = ssc_readl(ssc_p->ssc->regs, RFMR);
709         ssc_p->ssc_state.ssc_tcmr = ssc_readl(ssc_p->ssc->regs, TCMR);
710         ssc_p->ssc_state.ssc_tfmr = ssc_readl(ssc_p->ssc->regs, TFMR);
711 
712         return 0;
713 }
714 
715 
716 
717 static int atmel_ssc_resume(struct snd_soc_dai *cpu_dai)
718 {
719         struct atmel_ssc_info *ssc_p;
720         u32 cr;
721 
722         if (!cpu_dai->active)
723                 return 0;
724 
725         ssc_p = &ssc_info[cpu_dai->id];
726 
727         /* restore SSC register settings */
728         ssc_writel(ssc_p->ssc->regs, TFMR, ssc_p->ssc_state.ssc_tfmr);
729         ssc_writel(ssc_p->ssc->regs, TCMR, ssc_p->ssc_state.ssc_tcmr);
730         ssc_writel(ssc_p->ssc->regs, RFMR, ssc_p->ssc_state.ssc_rfmr);
731         ssc_writel(ssc_p->ssc->regs, RCMR, ssc_p->ssc_state.ssc_rcmr);
732         ssc_writel(ssc_p->ssc->regs, CMR, ssc_p->ssc_state.ssc_cmr);
733 
734         /* re-enable interrupts */
735         ssc_writel(ssc_p->ssc->regs, IER, ssc_p->ssc_state.ssc_imr);
736 
737         /* Re-enable receive and transmit as appropriate */
738         cr = 0;
739         cr |=
740             (ssc_p->ssc_state.ssc_sr & SSC_BIT(SR_RXEN)) ? SSC_BIT(CR_RXEN) : 0;
741         cr |=
742             (ssc_p->ssc_state.ssc_sr & SSC_BIT(SR_TXEN)) ? SSC_BIT(CR_TXEN) : 0;
743         ssc_writel(ssc_p->ssc->regs, CR, cr);
744 
745         return 0;
746 }
747 #else /* CONFIG_PM */
748 #  define atmel_ssc_suspend     NULL
749 #  define atmel_ssc_resume      NULL
750 #endif /* CONFIG_PM */
751 
752 #define ATMEL_SSC_RATES (SNDRV_PCM_RATE_8000_96000)
753 
754 #define ATMEL_SSC_FORMATS (SNDRV_PCM_FMTBIT_S8     | SNDRV_PCM_FMTBIT_S16_LE |\
755                           SNDRV_PCM_FMTBIT_S24_LE | SNDRV_PCM_FMTBIT_S32_LE)
756 
757 static const struct snd_soc_dai_ops atmel_ssc_dai_ops = {
758         .startup        = atmel_ssc_startup,
759         .shutdown       = atmel_ssc_shutdown,
760         .prepare        = atmel_ssc_prepare,
761         .trigger        = atmel_ssc_trigger,
762         .hw_params      = atmel_ssc_hw_params,
763         .set_fmt        = atmel_ssc_set_dai_fmt,
764         .set_clkdiv     = atmel_ssc_set_dai_clkdiv,
765 };
766 
767 static struct snd_soc_dai_driver atmel_ssc_dai = {
768                 .suspend = atmel_ssc_suspend,
769                 .resume = atmel_ssc_resume,
770                 .playback = {
771                         .channels_min = 1,
772                         .channels_max = 2,
773                         .rates = ATMEL_SSC_RATES,
774                         .formats = ATMEL_SSC_FORMATS,},
775                 .capture = {
776                         .channels_min = 1,
777                         .channels_max = 2,
778                         .rates = ATMEL_SSC_RATES,
779                         .formats = ATMEL_SSC_FORMATS,},
780                 .ops = &atmel_ssc_dai_ops,
781 };
782 
783 static const struct snd_soc_component_driver atmel_ssc_component = {
784         .name           = "atmel-ssc",
785 };
786 
787 static int asoc_ssc_init(struct device *dev)
788 {
789         struct platform_device *pdev = to_platform_device(dev);
790         struct ssc_device *ssc = platform_get_drvdata(pdev);
791         int ret;
792 
793         ret = snd_soc_register_component(dev, &atmel_ssc_component,
794                                          &atmel_ssc_dai, 1);
795         if (ret) {
796                 dev_err(dev, "Could not register DAI: %d\n", ret);
797                 goto err;
798         }
799 
800         if (ssc->pdata->use_dma)
801                 ret = atmel_pcm_dma_platform_register(dev);
802         else
803                 ret = atmel_pcm_pdc_platform_register(dev);
804 
805         if (ret) {
806                 dev_err(dev, "Could not register PCM: %d\n", ret);
807                 goto err_unregister_dai;
808         }
809 
810         return 0;
811 
812 err_unregister_dai:
813         snd_soc_unregister_component(dev);
814 err:
815         return ret;
816 }
817 
818 static void asoc_ssc_exit(struct device *dev)
819 {
820         struct platform_device *pdev = to_platform_device(dev);
821         struct ssc_device *ssc = platform_get_drvdata(pdev);
822 
823         if (ssc->pdata->use_dma)
824                 atmel_pcm_dma_platform_unregister(dev);
825         else
826                 atmel_pcm_pdc_platform_unregister(dev);
827 
828         snd_soc_unregister_component(dev);
829 }
830 
831 /**
832  * atmel_ssc_set_audio - Allocate the specified SSC for audio use.
833  */
834 int atmel_ssc_set_audio(int ssc_id)
835 {
836         struct ssc_device *ssc;
837         int ret;
838 
839         /* If we can grab the SSC briefly to parent the DAI device off it */
840         ssc = ssc_request(ssc_id);
841         if (IS_ERR(ssc)) {
842                 pr_err("Unable to parent ASoC SSC DAI on SSC: %ld\n",
843                         PTR_ERR(ssc));
844                 return PTR_ERR(ssc);
845         } else {
846                 ssc_info[ssc_id].ssc = ssc;
847         }
848 
849         ret = asoc_ssc_init(&ssc->pdev->dev);
850 
851         return ret;
852 }
853 EXPORT_SYMBOL_GPL(atmel_ssc_set_audio);
854 
855 void atmel_ssc_put_audio(int ssc_id)
856 {
857         struct ssc_device *ssc = ssc_info[ssc_id].ssc;
858 
859         asoc_ssc_exit(&ssc->pdev->dev);
860         ssc_free(ssc);
861 }
862 EXPORT_SYMBOL_GPL(atmel_ssc_put_audio);
863 
864 /* Module information */
865 MODULE_AUTHOR("Sedji Gaouaou, sedji.gaouaou@atmel.com, www.atmel.com");
866 MODULE_DESCRIPTION("ATMEL SSC ASoC Interface");
867 MODULE_LICENSE("GPL");
868 

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