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irqchip/s3c24xx: Mark init_eint as __maybe_unused
[linux/fpc-iii.git] / sound / soc / atmel / atmel_ssc_dai.c
blobba8def5665c458842d2f333d35e34c2974b2136e
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 * When the bit clock is input, limit the maximum rate according to the
192 * Serial Clock Ratio Considerations section from the SSC documentation:
193 *
194 * The Transmitter and the Receiver can be programmed to operate
195 * with the clock signals provided on either the TK or RK pins.
196 * This allows the SSC to support many slave-mode data transfers.
197 * In this case, the maximum clock speed allowed on the RK pin is:
198 * - Peripheral clock divided by 2 if Receiver Frame Synchro is input
199 * - Peripheral clock divided by 3 if Receiver Frame Synchro is output
200 * In addition, the maximum clock speed allowed on the TK pin is:
201 * - Peripheral clock divided by 6 if Transmit Frame Synchro is input
202 * - Peripheral clock divided by 2 if Transmit Frame Synchro is output
203 *
204 * When the bit clock is output, limit the rate according to the
205 * SSC divider restrictions.
206 */
207 static int atmel_ssc_hw_rule_rate(struct snd_pcm_hw_params *params,
208 struct snd_pcm_hw_rule *rule)
209 {
210 struct atmel_ssc_info *ssc_p = rule->private;
211 struct ssc_device *ssc = ssc_p->ssc;
212 struct snd_interval *i = hw_param_interval(params, rule->var);
213 struct snd_interval t;
214 struct snd_ratnum r = {
215 .den_min = 1,
216 .den_max = 4095,
217 .den_step = 1,
218 };
219 unsigned int num = 0, den = 0;
220 int frame_size;
221 int mck_div = 2;
222 int ret;
223
224 frame_size = snd_soc_params_to_frame_size(params);
225 if (frame_size < 0)
226 return frame_size;
227
228 switch (ssc_p->daifmt & SND_SOC_DAIFMT_MASTER_MASK) {
229 case SND_SOC_DAIFMT_CBM_CFS:
230 if ((ssc_p->dir_mask & SSC_DIR_MASK_CAPTURE)
231 && ssc->clk_from_rk_pin)
232 /* Receiver Frame Synchro (i.e. capture)
233 * is output (format is _CFS) and the RK pin
234 * is used for input (format is _CBM_).
235 */
236 mck_div = 3;
237 break;
238
239 case SND_SOC_DAIFMT_CBM_CFM:
240 if ((ssc_p->dir_mask & SSC_DIR_MASK_PLAYBACK)
241 && !ssc->clk_from_rk_pin)
242 /* Transmit Frame Synchro (i.e. playback)
243 * is input (format is _CFM) and the TK pin
244 * is used for input (format _CBM_ but not
245 * using the RK pin).
246 */
247 mck_div = 6;
248 break;
249 }
250
251 switch (ssc_p->daifmt & SND_SOC_DAIFMT_MASTER_MASK) {
252 case SND_SOC_DAIFMT_CBS_CFS:
253 r.num = ssc_p->mck_rate / mck_div / frame_size;
254
255 ret = snd_interval_ratnum(i, 1, &r, &num, &den);
256 if (ret >= 0 && den && rule->var == SNDRV_PCM_HW_PARAM_RATE) {
257 params->rate_num = num;
258 params->rate_den = den;
259 }
260 break;
261
262 case SND_SOC_DAIFMT_CBM_CFS:
263 case SND_SOC_DAIFMT_CBM_CFM:
264 t.min = 8000;
265 t.max = ssc_p->mck_rate / mck_div / frame_size;
266 t.openmin = t.openmax = 0;
267 t.integer = 0;
268 ret = snd_interval_refine(i, &t);
269 break;
270
271 default:
272 ret = -EINVAL;
273 break;
274 }
275
276 return ret;
277 }
278
279 /*-------------------------------------------------------------------------*\
280 * DAI functions
281 \*-------------------------------------------------------------------------*/
282 /*
283 * Startup. Only that one substream allowed in each direction.
284 */
285 static int atmel_ssc_startup(struct snd_pcm_substream *substream,
286 struct snd_soc_dai *dai)
287 {
288 struct atmel_ssc_info *ssc_p = &ssc_info[dai->id];
289 struct atmel_pcm_dma_params *dma_params;
290 int dir, dir_mask;
291 int ret;
292
293 pr_debug("atmel_ssc_startup: SSC_SR=0x%x\n",
294 ssc_readl(ssc_p->ssc->regs, SR));
295
296 /* Enable PMC peripheral clock for this SSC */
297 pr_debug("atmel_ssc_dai: Starting clock\n");
298 clk_enable(ssc_p->ssc->clk);
299 ssc_p->mck_rate = clk_get_rate(ssc_p->ssc->clk);
300
301 /* Reset the SSC to keep it at a clean status */
302 ssc_writel(ssc_p->ssc->regs, CR, SSC_BIT(CR_SWRST));
303
304 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
305 dir = 0;
306 dir_mask = SSC_DIR_MASK_PLAYBACK;
307 } else {
308 dir = 1;
309 dir_mask = SSC_DIR_MASK_CAPTURE;
310 }
311
312 ret = snd_pcm_hw_rule_add(substream->runtime, 0,
313 SNDRV_PCM_HW_PARAM_RATE,
314 atmel_ssc_hw_rule_rate,
315 ssc_p,
316 SNDRV_PCM_HW_PARAM_FRAME_BITS,
317 SNDRV_PCM_HW_PARAM_CHANNELS, -1);
318 if (ret < 0) {
319 dev_err(dai->dev, "Failed to specify rate rule: %d\n", ret);
320 return ret;
321 }
322
323 dma_params = &ssc_dma_params[dai->id][dir];
324 dma_params->ssc = ssc_p->ssc;
325 dma_params->substream = substream;
326
327 ssc_p->dma_params[dir] = dma_params;
328
329 snd_soc_dai_set_dma_data(dai, substream, dma_params);
330
331 spin_lock_irq(&ssc_p->lock);
332 if (ssc_p->dir_mask & dir_mask) {
333 spin_unlock_irq(&ssc_p->lock);
334 return -EBUSY;
335 }
336 ssc_p->dir_mask |= dir_mask;
337 spin_unlock_irq(&ssc_p->lock);
338
339 return 0;
340 }
341
342 /*
343 * Shutdown. Clear DMA parameters and shutdown the SSC if there
344 * are no other substreams open.
345 */
346 static void atmel_ssc_shutdown(struct snd_pcm_substream *substream,
347 struct snd_soc_dai *dai)
348 {
349 struct atmel_ssc_info *ssc_p = &ssc_info[dai->id];
350 struct atmel_pcm_dma_params *dma_params;
351 int dir, dir_mask;
352
353 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
354 dir = 0;
355 else
356 dir = 1;
357
358 dma_params = ssc_p->dma_params[dir];
359
360 if (dma_params != NULL) {
361 dma_params->ssc = NULL;
362 dma_params->substream = NULL;
363 ssc_p->dma_params[dir] = NULL;
364 }
365
366 dir_mask = 1 << dir;
367
368 spin_lock_irq(&ssc_p->lock);
369 ssc_p->dir_mask &= ~dir_mask;
370 if (!ssc_p->dir_mask) {
371 if (ssc_p->initialized) {
372 free_irq(ssc_p->ssc->irq, ssc_p);
373 ssc_p->initialized = 0;
374 }
375
376 /* Reset the SSC */
377 ssc_writel(ssc_p->ssc->regs, CR, SSC_BIT(CR_SWRST));
378 /* Clear the SSC dividers */
379 ssc_p->cmr_div = ssc_p->tcmr_period = ssc_p->rcmr_period = 0;
380 }
381 spin_unlock_irq(&ssc_p->lock);
382
383 /* Shutdown the SSC clock. */
384 pr_debug("atmel_ssc_dai: Stopping clock\n");
385 clk_disable(ssc_p->ssc->clk);
386 }
387
388
389 /*
390 * Record the DAI format for use in hw_params().
391 */
392 static int atmel_ssc_set_dai_fmt(struct snd_soc_dai *cpu_dai,
393 unsigned int fmt)
394 {
395 struct atmel_ssc_info *ssc_p = &ssc_info[cpu_dai->id];
396
397 ssc_p->daifmt = fmt;
398 return 0;
399 }
400
401 /*
402 * Record SSC clock dividers for use in hw_params().
403 */
404 static int atmel_ssc_set_dai_clkdiv(struct snd_soc_dai *cpu_dai,
405 int div_id, int div)
406 {
407 struct atmel_ssc_info *ssc_p = &ssc_info[cpu_dai->id];
408
409 switch (div_id) {
410 case ATMEL_SSC_CMR_DIV:
411 /*
412 * The same master clock divider is used for both
413 * transmit and receive, so if a value has already
414 * been set, it must match this value.
415 */
416 if (ssc_p->dir_mask !=
417 (SSC_DIR_MASK_PLAYBACK | SSC_DIR_MASK_CAPTURE))
418 ssc_p->cmr_div = div;
419 else if (ssc_p->cmr_div == 0)
420 ssc_p->cmr_div = div;
421 else
422 if (div != ssc_p->cmr_div)
423 return -EBUSY;
424 break;
425
426 case ATMEL_SSC_TCMR_PERIOD:
427 ssc_p->tcmr_period = div;
428 break;
429
430 case ATMEL_SSC_RCMR_PERIOD:
431 ssc_p->rcmr_period = div;
432 break;
433
434 default:
435 return -EINVAL;
436 }
437
438 return 0;
439 }
440
441 /*
442 * Configure the SSC.
443 */
444 static int atmel_ssc_hw_params(struct snd_pcm_substream *substream,
445 struct snd_pcm_hw_params *params,
446 struct snd_soc_dai *dai)
447 {
448 int id = dai->id;
449 struct atmel_ssc_info *ssc_p = &ssc_info[id];
450 struct ssc_device *ssc = ssc_p->ssc;
451 struct atmel_pcm_dma_params *dma_params;
452 int dir, channels, bits;
453 u32 tfmr, rfmr, tcmr, rcmr;
454 int ret;
455 int fslen, fslen_ext;
456
457 /*
458 * Currently, there is only one set of dma params for
459 * each direction. If more are added, this code will
460 * have to be changed to select the proper set.
461 */
462 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
463 dir = 0;
464 else
465 dir = 1;
466
467 dma_params = ssc_p->dma_params[dir];
468
469 channels = params_channels(params);
470
471 /*
472 * Determine sample size in bits and the PDC increment.
473 */
474 switch (params_format(params)) {
475 case SNDRV_PCM_FORMAT_S8:
476 bits = 8;
477 dma_params->pdc_xfer_size = 1;
478 break;
479 case SNDRV_PCM_FORMAT_S16_LE:
480 bits = 16;
481 dma_params->pdc_xfer_size = 2;
482 break;
483 case SNDRV_PCM_FORMAT_S24_LE:
484 bits = 24;
485 dma_params->pdc_xfer_size = 4;
486 break;
487 case SNDRV_PCM_FORMAT_S32_LE:
488 bits = 32;
489 dma_params->pdc_xfer_size = 4;
490 break;
491 default:
492 printk(KERN_WARNING "atmel_ssc_dai: unsupported PCM format");
493 return -EINVAL;
494 }
495
496 /*
497 * Compute SSC register settings.
498 */
499 switch (ssc_p->daifmt
500 & (SND_SOC_DAIFMT_FORMAT_MASK | SND_SOC_DAIFMT_MASTER_MASK)) {
501
502 case SND_SOC_DAIFMT_I2S | SND_SOC_DAIFMT_CBS_CFS:
503 /*
504 * I2S format, SSC provides BCLK and LRC clocks.
505 *
506 * The SSC transmit and receive clocks are generated
507 * from the MCK divider, and the BCLK signal
508 * is output on the SSC TK line.
509 */
510
511 if (bits > 16 && !ssc->pdata->has_fslen_ext) {
512 dev_err(dai->dev,
513 "sample size %d is too large for SSC device\n",
514 bits);
515 return -EINVAL;
516 }
517
518 fslen_ext = (bits - 1) / 16;
519 fslen = (bits - 1) % 16;
520
521 rcmr = SSC_BF(RCMR_PERIOD, ssc_p->rcmr_period)
522 | SSC_BF(RCMR_STTDLY, START_DELAY)
523 | SSC_BF(RCMR_START, SSC_START_FALLING_RF)
524 | SSC_BF(RCMR_CKI, SSC_CKI_RISING)
525 | SSC_BF(RCMR_CKO, SSC_CKO_NONE)
526 | SSC_BF(RCMR_CKS, SSC_CKS_DIV);
527
528 rfmr = SSC_BF(RFMR_FSLEN_EXT, fslen_ext)
529 | SSC_BF(RFMR_FSEDGE, SSC_FSEDGE_POSITIVE)
530 | SSC_BF(RFMR_FSOS, SSC_FSOS_NEGATIVE)
531 | SSC_BF(RFMR_FSLEN, fslen)
532 | SSC_BF(RFMR_DATNB, (channels - 1))
533 | SSC_BIT(RFMR_MSBF)
534 | SSC_BF(RFMR_LOOP, 0)
535 | SSC_BF(RFMR_DATLEN, (bits - 1));
536
537 tcmr = SSC_BF(TCMR_PERIOD, ssc_p->tcmr_period)
538 | SSC_BF(TCMR_STTDLY, START_DELAY)
539 | SSC_BF(TCMR_START, SSC_START_FALLING_RF)
540 | SSC_BF(TCMR_CKI, SSC_CKI_FALLING)
541 | SSC_BF(TCMR_CKO, SSC_CKO_CONTINUOUS)
542 | SSC_BF(TCMR_CKS, SSC_CKS_DIV);
543
544 tfmr = SSC_BF(TFMR_FSLEN_EXT, fslen_ext)
545 | SSC_BF(TFMR_FSEDGE, SSC_FSEDGE_POSITIVE)
546 | SSC_BF(TFMR_FSDEN, 0)
547 | SSC_BF(TFMR_FSOS, SSC_FSOS_NEGATIVE)
548 | SSC_BF(TFMR_FSLEN, fslen)
549 | SSC_BF(TFMR_DATNB, (channels - 1))
550 | SSC_BIT(TFMR_MSBF)
551 | SSC_BF(TFMR_DATDEF, 0)
552 | SSC_BF(TFMR_DATLEN, (bits - 1));
553 break;
554
555 case SND_SOC_DAIFMT_I2S | SND_SOC_DAIFMT_CBM_CFM:
556 /* I2S format, CODEC supplies BCLK and LRC clocks. */
557 rcmr = SSC_BF(RCMR_PERIOD, 0)
558 | SSC_BF(RCMR_STTDLY, START_DELAY)
559 | SSC_BF(RCMR_START, SSC_START_FALLING_RF)
560 | SSC_BF(RCMR_CKI, SSC_CKI_RISING)
561 | SSC_BF(RCMR_CKO, SSC_CKO_NONE)
562 | SSC_BF(RCMR_CKS, ssc->clk_from_rk_pin ?
563 SSC_CKS_PIN : SSC_CKS_CLOCK);
564
565 rfmr = SSC_BF(RFMR_FSEDGE, SSC_FSEDGE_POSITIVE)
566 | SSC_BF(RFMR_FSOS, SSC_FSOS_NONE)
567 | SSC_BF(RFMR_FSLEN, 0)
568 | SSC_BF(RFMR_DATNB, (channels - 1))
569 | SSC_BIT(RFMR_MSBF)
570 | SSC_BF(RFMR_LOOP, 0)
571 | SSC_BF(RFMR_DATLEN, (bits - 1));
572
573 tcmr = SSC_BF(TCMR_PERIOD, 0)
574 | SSC_BF(TCMR_STTDLY, START_DELAY)
575 | SSC_BF(TCMR_START, SSC_START_FALLING_RF)
576 | SSC_BF(TCMR_CKI, SSC_CKI_FALLING)
577 | SSC_BF(TCMR_CKO, SSC_CKO_NONE)
578 | SSC_BF(TCMR_CKS, ssc->clk_from_rk_pin ?
579 SSC_CKS_CLOCK : SSC_CKS_PIN);
580
581 tfmr = SSC_BF(TFMR_FSEDGE, SSC_FSEDGE_POSITIVE)
582 | SSC_BF(TFMR_FSDEN, 0)
583 | SSC_BF(TFMR_FSOS, SSC_FSOS_NONE)
584 | SSC_BF(TFMR_FSLEN, 0)
585 | SSC_BF(TFMR_DATNB, (channels - 1))
586 | SSC_BIT(TFMR_MSBF)
587 | SSC_BF(TFMR_DATDEF, 0)
588 | SSC_BF(TFMR_DATLEN, (bits - 1));
589 break;
590
591 case SND_SOC_DAIFMT_I2S | SND_SOC_DAIFMT_CBM_CFS:
592 /* I2S format, CODEC supplies BCLK, SSC supplies LRCLK. */
593 if (bits > 16 && !ssc->pdata->has_fslen_ext) {
594 dev_err(dai->dev,
595 "sample size %d is too large for SSC device\n",
596 bits);
597 return -EINVAL;
598 }
599
600 fslen_ext = (bits - 1) / 16;
601 fslen = (bits - 1) % 16;
602
603 rcmr = SSC_BF(RCMR_PERIOD, ssc_p->rcmr_period)
604 | SSC_BF(RCMR_STTDLY, START_DELAY)
605 | SSC_BF(RCMR_START, SSC_START_FALLING_RF)
606 | SSC_BF(RCMR_CKI, SSC_CKI_RISING)
607 | SSC_BF(RCMR_CKO, SSC_CKO_NONE)
608 | SSC_BF(RCMR_CKS, ssc->clk_from_rk_pin ?
609 SSC_CKS_PIN : SSC_CKS_CLOCK);
610
611 rfmr = SSC_BF(RFMR_FSLEN_EXT, fslen_ext)
612 | SSC_BF(RFMR_FSEDGE, SSC_FSEDGE_POSITIVE)
613 | SSC_BF(RFMR_FSOS, SSC_FSOS_NEGATIVE)
614 | SSC_BF(RFMR_FSLEN, fslen)
615 | SSC_BF(RFMR_DATNB, (channels - 1))
616 | SSC_BIT(RFMR_MSBF)
617 | SSC_BF(RFMR_LOOP, 0)
618 | SSC_BF(RFMR_DATLEN, (bits - 1));
619
620 tcmr = SSC_BF(TCMR_PERIOD, ssc_p->tcmr_period)
621 | SSC_BF(TCMR_STTDLY, START_DELAY)
622 | SSC_BF(TCMR_START, SSC_START_FALLING_RF)
623 | SSC_BF(TCMR_CKI, SSC_CKI_FALLING)
624 | SSC_BF(TCMR_CKO, SSC_CKO_NONE)
625 | SSC_BF(TCMR_CKS, ssc->clk_from_rk_pin ?
626 SSC_CKS_CLOCK : SSC_CKS_PIN);
627
628 tfmr = SSC_BF(TFMR_FSLEN_EXT, fslen_ext)
629 | SSC_BF(TFMR_FSEDGE, SSC_FSEDGE_NEGATIVE)
630 | SSC_BF(TFMR_FSDEN, 0)
631 | SSC_BF(TFMR_FSOS, SSC_FSOS_NEGATIVE)
632 | SSC_BF(TFMR_FSLEN, fslen)
633 | SSC_BF(TFMR_DATNB, (channels - 1))
634 | SSC_BIT(TFMR_MSBF)
635 | SSC_BF(TFMR_DATDEF, 0)
636 | SSC_BF(TFMR_DATLEN, (bits - 1));
637 break;
638
639 case SND_SOC_DAIFMT_DSP_A | SND_SOC_DAIFMT_CBS_CFS:
640 /*
641 * DSP/PCM Mode A format, SSC provides BCLK and LRC clocks.
642 *
643 * The SSC transmit and receive clocks are generated from the
644 * MCK divider, and the BCLK signal is output
645 * on the SSC TK line.
646 */
647 rcmr = SSC_BF(RCMR_PERIOD, ssc_p->rcmr_period)
648 | SSC_BF(RCMR_STTDLY, 1)
649 | SSC_BF(RCMR_START, SSC_START_RISING_RF)
650 | SSC_BF(RCMR_CKI, SSC_CKI_FALLING)
651 | SSC_BF(RCMR_CKO, SSC_CKO_NONE)
652 | SSC_BF(RCMR_CKS, SSC_CKS_DIV);
653
654 rfmr = SSC_BF(RFMR_FSEDGE, SSC_FSEDGE_POSITIVE)
655 | SSC_BF(RFMR_FSOS, SSC_FSOS_POSITIVE)
656 | SSC_BF(RFMR_FSLEN, 0)
657 | SSC_BF(RFMR_DATNB, (channels - 1))
658 | SSC_BIT(RFMR_MSBF)
659 | SSC_BF(RFMR_LOOP, 0)
660 | SSC_BF(RFMR_DATLEN, (bits - 1));
661
662 tcmr = SSC_BF(TCMR_PERIOD, ssc_p->tcmr_period)
663 | SSC_BF(TCMR_STTDLY, 1)
664 | SSC_BF(TCMR_START, SSC_START_RISING_RF)
665 | SSC_BF(TCMR_CKI, SSC_CKI_FALLING)
666 | SSC_BF(TCMR_CKO, SSC_CKO_CONTINUOUS)
667 | SSC_BF(TCMR_CKS, SSC_CKS_DIV);
668
669 tfmr = SSC_BF(TFMR_FSEDGE, SSC_FSEDGE_POSITIVE)
670 | SSC_BF(TFMR_FSDEN, 0)
671 | SSC_BF(TFMR_FSOS, SSC_FSOS_POSITIVE)
672 | SSC_BF(TFMR_FSLEN, 0)
673 | SSC_BF(TFMR_DATNB, (channels - 1))
674 | SSC_BIT(TFMR_MSBF)
675 | SSC_BF(TFMR_DATDEF, 0)
676 | SSC_BF(TFMR_DATLEN, (bits - 1));
677 break;
678
679 case SND_SOC_DAIFMT_DSP_A | SND_SOC_DAIFMT_CBM_CFM:
680 /*
681 * DSP/PCM Mode A format, CODEC supplies BCLK and LRC clocks.
682 *
683 * Data is transferred on first BCLK after LRC pulse rising
684 * edge.If stereo, the right channel data is contiguous with
685 * the left channel data.
686 */
687 rcmr = SSC_BF(RCMR_PERIOD, 0)
688 | SSC_BF(RCMR_STTDLY, START_DELAY)
689 | SSC_BF(RCMR_START, SSC_START_RISING_RF)
690 | SSC_BF(RCMR_CKI, SSC_CKI_FALLING)
691 | SSC_BF(RCMR_CKO, SSC_CKO_NONE)
692 | SSC_BF(RCMR_CKS, ssc->clk_from_rk_pin ?
693 SSC_CKS_PIN : SSC_CKS_CLOCK);
694
695 rfmr = SSC_BF(RFMR_FSEDGE, SSC_FSEDGE_POSITIVE)
696 | SSC_BF(RFMR_FSOS, SSC_FSOS_NONE)
697 | SSC_BF(RFMR_FSLEN, 0)
698 | SSC_BF(RFMR_DATNB, (channels - 1))
699 | SSC_BIT(RFMR_MSBF)
700 | SSC_BF(RFMR_LOOP, 0)
701 | SSC_BF(RFMR_DATLEN, (bits - 1));
702
703 tcmr = SSC_BF(TCMR_PERIOD, 0)
704 | SSC_BF(TCMR_STTDLY, START_DELAY)
705 | SSC_BF(TCMR_START, SSC_START_RISING_RF)
706 | SSC_BF(TCMR_CKI, SSC_CKI_FALLING)
707 | SSC_BF(TCMR_CKO, SSC_CKO_NONE)
708 | SSC_BF(RCMR_CKS, ssc->clk_from_rk_pin ?
709 SSC_CKS_CLOCK : SSC_CKS_PIN);
710
711 tfmr = SSC_BF(TFMR_FSEDGE, SSC_FSEDGE_POSITIVE)
712 | SSC_BF(TFMR_FSDEN, 0)
713 | SSC_BF(TFMR_FSOS, SSC_FSOS_NONE)
714 | SSC_BF(TFMR_FSLEN, 0)
715 | SSC_BF(TFMR_DATNB, (channels - 1))
716 | SSC_BIT(TFMR_MSBF)
717 | SSC_BF(TFMR_DATDEF, 0)
718 | SSC_BF(TFMR_DATLEN, (bits - 1));
719 break;
720
721 default:
722 printk(KERN_WARNING "atmel_ssc_dai: unsupported DAI format 0x%x\n",
723 ssc_p->daifmt);
724 return -EINVAL;
725 }
726 pr_debug("atmel_ssc_hw_params: "
727 "RCMR=%08x RFMR=%08x TCMR=%08x TFMR=%08x\n",
728 rcmr, rfmr, tcmr, tfmr);
729
730 if (!ssc_p->initialized) {
731 if (!ssc_p->ssc->pdata->use_dma) {
732 ssc_writel(ssc_p->ssc->regs, PDC_RPR, 0);
733 ssc_writel(ssc_p->ssc->regs, PDC_RCR, 0);
734 ssc_writel(ssc_p->ssc->regs, PDC_RNPR, 0);
735 ssc_writel(ssc_p->ssc->regs, PDC_RNCR, 0);
736
737 ssc_writel(ssc_p->ssc->regs, PDC_TPR, 0);
738 ssc_writel(ssc_p->ssc->regs, PDC_TCR, 0);
739 ssc_writel(ssc_p->ssc->regs, PDC_TNPR, 0);
740 ssc_writel(ssc_p->ssc->regs, PDC_TNCR, 0);
741 }
742
743 ret = request_irq(ssc_p->ssc->irq, atmel_ssc_interrupt, 0,
744 ssc_p->name, ssc_p);
745 if (ret < 0) {
746 printk(KERN_WARNING
747 "atmel_ssc_dai: request_irq failure\n");
748 pr_debug("Atmel_ssc_dai: Stoping clock\n");
749 clk_disable(ssc_p->ssc->clk);
750 return ret;
751 }
752
753 ssc_p->initialized = 1;
754 }
755
756 /* set SSC clock mode register */
757 ssc_writel(ssc_p->ssc->regs, CMR, ssc_p->cmr_div);
758
759 /* set receive clock mode and format */
760 ssc_writel(ssc_p->ssc->regs, RCMR, rcmr);
761 ssc_writel(ssc_p->ssc->regs, RFMR, rfmr);
762
763 /* set transmit clock mode and format */
764 ssc_writel(ssc_p->ssc->regs, TCMR, tcmr);
765 ssc_writel(ssc_p->ssc->regs, TFMR, tfmr);
766
767 pr_debug("atmel_ssc_dai,hw_params: SSC initialized\n");
768 return 0;
769 }
770
771
772 static int atmel_ssc_prepare(struct snd_pcm_substream *substream,
773 struct snd_soc_dai *dai)
774 {
775 struct atmel_ssc_info *ssc_p = &ssc_info[dai->id];
776 struct atmel_pcm_dma_params *dma_params;
777 int dir;
778
779 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
780 dir = 0;
781 else
782 dir = 1;
783
784 dma_params = ssc_p->dma_params[dir];
785
786 ssc_writel(ssc_p->ssc->regs, CR, dma_params->mask->ssc_disable);
787 ssc_writel(ssc_p->ssc->regs, IDR, dma_params->mask->ssc_error);
788
789 pr_debug("%s enabled SSC_SR=0x%08x\n",
790 dir ? "receive" : "transmit",
791 ssc_readl(ssc_p->ssc->regs, SR));
792 return 0;
793 }
794
795 static int atmel_ssc_trigger(struct snd_pcm_substream *substream,
796 int cmd, struct snd_soc_dai *dai)
797 {
798 struct atmel_ssc_info *ssc_p = &ssc_info[dai->id];
799 struct atmel_pcm_dma_params *dma_params;
800 int dir;
801
802 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
803 dir = 0;
804 else
805 dir = 1;
806
807 dma_params = ssc_p->dma_params[dir];
808
809 switch (cmd) {
810 case SNDRV_PCM_TRIGGER_START:
811 case SNDRV_PCM_TRIGGER_RESUME:
812 case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
813 ssc_writel(ssc_p->ssc->regs, CR, dma_params->mask->ssc_enable);
814 break;
815 default:
816 ssc_writel(ssc_p->ssc->regs, CR, dma_params->mask->ssc_disable);
817 break;
818 }
819
820 return 0;
821 }
822
823 #ifdef CONFIG_PM
824 static int atmel_ssc_suspend(struct snd_soc_dai *cpu_dai)
825 {
826 struct atmel_ssc_info *ssc_p;
827
828 if (!cpu_dai->active)
829 return 0;
830
831 ssc_p = &ssc_info[cpu_dai->id];
832
833 /* Save the status register before disabling transmit and receive */
834 ssc_p->ssc_state.ssc_sr = ssc_readl(ssc_p->ssc->regs, SR);
835 ssc_writel(ssc_p->ssc->regs, CR, SSC_BIT(CR_TXDIS) | SSC_BIT(CR_RXDIS));
836
837 /* Save the current interrupt mask, then disable unmasked interrupts */
838 ssc_p->ssc_state.ssc_imr = ssc_readl(ssc_p->ssc->regs, IMR);
839 ssc_writel(ssc_p->ssc->regs, IDR, ssc_p->ssc_state.ssc_imr);
840
841 ssc_p->ssc_state.ssc_cmr = ssc_readl(ssc_p->ssc->regs, CMR);
842 ssc_p->ssc_state.ssc_rcmr = ssc_readl(ssc_p->ssc->regs, RCMR);
843 ssc_p->ssc_state.ssc_rfmr = ssc_readl(ssc_p->ssc->regs, RFMR);
844 ssc_p->ssc_state.ssc_tcmr = ssc_readl(ssc_p->ssc->regs, TCMR);
845 ssc_p->ssc_state.ssc_tfmr = ssc_readl(ssc_p->ssc->regs, TFMR);
846
847 return 0;
848 }
849
850
851
852 static int atmel_ssc_resume(struct snd_soc_dai *cpu_dai)
853 {
854 struct atmel_ssc_info *ssc_p;
855 u32 cr;
856
857 if (!cpu_dai->active)
858 return 0;
859
860 ssc_p = &ssc_info[cpu_dai->id];
861
862 /* restore SSC register settings */
863 ssc_writel(ssc_p->ssc->regs, TFMR, ssc_p->ssc_state.ssc_tfmr);
864 ssc_writel(ssc_p->ssc->regs, TCMR, ssc_p->ssc_state.ssc_tcmr);
865 ssc_writel(ssc_p->ssc->regs, RFMR, ssc_p->ssc_state.ssc_rfmr);
866 ssc_writel(ssc_p->ssc->regs, RCMR, ssc_p->ssc_state.ssc_rcmr);
867 ssc_writel(ssc_p->ssc->regs, CMR, ssc_p->ssc_state.ssc_cmr);
868
869 /* re-enable interrupts */
870 ssc_writel(ssc_p->ssc->regs, IER, ssc_p->ssc_state.ssc_imr);
871
872 /* Re-enable receive and transmit as appropriate */
873 cr = 0;
874 cr |=
875 (ssc_p->ssc_state.ssc_sr & SSC_BIT(SR_RXEN)) ? SSC_BIT(CR_RXEN) : 0;
876 cr |=
877 (ssc_p->ssc_state.ssc_sr & SSC_BIT(SR_TXEN)) ? SSC_BIT(CR_TXEN) : 0;
878 ssc_writel(ssc_p->ssc->regs, CR, cr);
879
880 return 0;
881 }
882 #else /* CONFIG_PM */
883 # define atmel_ssc_suspend NULL
884 # define atmel_ssc_resume NULL
885 #endif /* CONFIG_PM */
886
887 #define ATMEL_SSC_FORMATS (SNDRV_PCM_FMTBIT_S8 | SNDRV_PCM_FMTBIT_S16_LE |\
888 SNDRV_PCM_FMTBIT_S24_LE | SNDRV_PCM_FMTBIT_S32_LE)
889
890 static const struct snd_soc_dai_ops atmel_ssc_dai_ops = {
891 .startup = atmel_ssc_startup,
892 .shutdown = atmel_ssc_shutdown,
893 .prepare = atmel_ssc_prepare,
894 .trigger = atmel_ssc_trigger,
895 .hw_params = atmel_ssc_hw_params,
896 .set_fmt = atmel_ssc_set_dai_fmt,
897 .set_clkdiv = atmel_ssc_set_dai_clkdiv,
898 };
899
900 static struct snd_soc_dai_driver atmel_ssc_dai = {
901 .suspend = atmel_ssc_suspend,
902 .resume = atmel_ssc_resume,
903 .playback = {
904 .channels_min = 1,
905 .channels_max = 2,
906 .rates = SNDRV_PCM_RATE_CONTINUOUS,
907 .rate_min = 8000,
908 .rate_max = 384000,
909 .formats = ATMEL_SSC_FORMATS,},
910 .capture = {
911 .channels_min = 1,
912 .channels_max = 2,
913 .rates = SNDRV_PCM_RATE_CONTINUOUS,
914 .rate_min = 8000,
915 .rate_max = 384000,
916 .formats = ATMEL_SSC_FORMATS,},
917 .ops = &atmel_ssc_dai_ops,
918 };
919
920 static const struct snd_soc_component_driver atmel_ssc_component = {
921 .name = "atmel-ssc",
922 };
923
924 static int asoc_ssc_init(struct device *dev)
925 {
926 struct platform_device *pdev = to_platform_device(dev);
927 struct ssc_device *ssc = platform_get_drvdata(pdev);
928 int ret;
929
930 ret = snd_soc_register_component(dev, &atmel_ssc_component,
931 &atmel_ssc_dai, 1);
932 if (ret) {
933 dev_err(dev, "Could not register DAI: %d\n", ret);
934 goto err;
935 }
936
937 if (ssc->pdata->use_dma)
938 ret = atmel_pcm_dma_platform_register(dev);
939 else
940 ret = atmel_pcm_pdc_platform_register(dev);
941
942 if (ret) {
943 dev_err(dev, "Could not register PCM: %d\n", ret);
944 goto err_unregister_dai;
945 }
946
947 return 0;
948
949 err_unregister_dai:
950 snd_soc_unregister_component(dev);
951 err:
952 return ret;
953 }
954
955 static void asoc_ssc_exit(struct device *dev)
956 {
957 struct platform_device *pdev = to_platform_device(dev);
958 struct ssc_device *ssc = platform_get_drvdata(pdev);
959
960 if (ssc->pdata->use_dma)
961 atmel_pcm_dma_platform_unregister(dev);
962 else
963 atmel_pcm_pdc_platform_unregister(dev);
964
965 snd_soc_unregister_component(dev);
966 }
967
968 /**
969 * atmel_ssc_set_audio - Allocate the specified SSC for audio use.
970 */
971 int atmel_ssc_set_audio(int ssc_id)
972 {
973 struct ssc_device *ssc;
974 int ret;
975
976 /* If we can grab the SSC briefly to parent the DAI device off it */
977 ssc = ssc_request(ssc_id);
978 if (IS_ERR(ssc)) {
979 pr_err("Unable to parent ASoC SSC DAI on SSC: %ld\n",
980 PTR_ERR(ssc));
981 return PTR_ERR(ssc);
982 } else {
983 ssc_info[ssc_id].ssc = ssc;
984 }
985
986 ret = asoc_ssc_init(&ssc->pdev->dev);
987
988 return ret;
989 }
990 EXPORT_SYMBOL_GPL(atmel_ssc_set_audio);
991
992 void atmel_ssc_put_audio(int ssc_id)
993 {
994 struct ssc_device *ssc = ssc_info[ssc_id].ssc;
995
996 asoc_ssc_exit(&ssc->pdev->dev);
997 ssc_free(ssc);
998 }
999 EXPORT_SYMBOL_GPL(atmel_ssc_put_audio);
1000
1001 /* Module information */
1002 MODULE_AUTHOR("Sedji Gaouaou, sedji.gaouaou@atmel.com, www.atmel.com");
1003 MODULE_DESCRIPTION("ATMEL SSC ASoC Interface");
1004 MODULE_LICENSE("GPL");
Linux with added FPC-III support