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-rw-r--r--sound/soc/atmel/atmel_ssc_dai.c782
1 files changed, 782 insertions, 0 deletions
diff --git a/sound/soc/atmel/atmel_ssc_dai.c b/sound/soc/atmel/atmel_ssc_dai.c
new file mode 100644
index 000000000000..d290b7894917
--- /dev/null
+++ b/sound/soc/atmel/atmel_ssc_dai.c
@@ -0,0 +1,782 @@
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 <liam.girdwood@wolfsonmicro.com>
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 */
60static 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
67static 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 */
77static 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
86static 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 */
99static 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
135static 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 */
163static 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 */
205static int atmel_ssc_startup(struct snd_pcm_substream *substream)
206{
207 struct snd_soc_pcm_runtime *rtd = snd_pcm_substream_chip(substream);
208 struct atmel_ssc_info *ssc_p = &ssc_info[rtd->dai->cpu_dai->id];
209 int dir_mask;
210
211 pr_debug("atmel_ssc_startup: SSC_SR=0x%u\n",
212 ssc_readl(ssc_p->ssc->regs, SR));
213
214 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
215 dir_mask = SSC_DIR_MASK_PLAYBACK;
216 else
217 dir_mask = SSC_DIR_MASK_CAPTURE;
218
219 spin_lock_irq(&ssc_p->lock);
220 if (ssc_p->dir_mask & dir_mask) {
221 spin_unlock_irq(&ssc_p->lock);
222 return -EBUSY;
223 }
224 ssc_p->dir_mask |= dir_mask;
225 spin_unlock_irq(&ssc_p->lock);
226
227 return 0;
228}
229
230/*
231 * Shutdown. Clear DMA parameters and shutdown the SSC if there
232 * are no other substreams open.
233 */
234static void atmel_ssc_shutdown(struct snd_pcm_substream *substream)
235{
236 struct snd_soc_pcm_runtime *rtd = snd_pcm_substream_chip(substream);
237 struct atmel_ssc_info *ssc_p = &ssc_info[rtd->dai->cpu_dai->id];
238 struct atmel_pcm_dma_params *dma_params;
239 int dir, dir_mask;
240
241 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
242 dir = 0;
243 else
244 dir = 1;
245
246 dma_params = ssc_p->dma_params[dir];
247
248 if (dma_params != NULL) {
249 ssc_writel(ssc_p->ssc->regs, CR, dma_params->mask->ssc_disable);
250 pr_debug("atmel_ssc_shutdown: %s disabled SSC_SR=0x%08x\n",
251 (dir ? "receive" : "transmit"),
252 ssc_readl(ssc_p->ssc->regs, SR));
253
254 dma_params->ssc = NULL;
255 dma_params->substream = NULL;
256 ssc_p->dma_params[dir] = NULL;
257 }
258
259 dir_mask = 1 << dir;
260
261 spin_lock_irq(&ssc_p->lock);
262 ssc_p->dir_mask &= ~dir_mask;
263 if (!ssc_p->dir_mask) {
264 if (ssc_p->initialized) {
265 /* Shutdown the SSC clock. */
266 pr_debug("atmel_ssc_dau: Stopping clock\n");
267 clk_disable(ssc_p->ssc->clk);
268
269 free_irq(ssc_p->ssc->irq, ssc_p);
270 ssc_p->initialized = 0;
271 }
272
273 /* Reset the SSC */
274 ssc_writel(ssc_p->ssc->regs, CR, SSC_BIT(CR_SWRST));
275 /* Clear the SSC dividers */
276 ssc_p->cmr_div = ssc_p->tcmr_period = ssc_p->rcmr_period = 0;
277 }
278 spin_unlock_irq(&ssc_p->lock);
279}
280
281
282/*
283 * Record the DAI format for use in hw_params().
284 */
285static int atmel_ssc_set_dai_fmt(struct snd_soc_dai *cpu_dai,
286 unsigned int fmt)
287{
288 struct atmel_ssc_info *ssc_p = &ssc_info[cpu_dai->id];
289
290 ssc_p->daifmt = fmt;
291 return 0;
292}
293
294/*
295 * Record SSC clock dividers for use in hw_params().
296 */
297static int atmel_ssc_set_dai_clkdiv(struct snd_soc_dai *cpu_dai,
298 int div_id, int div)
299{
300 struct atmel_ssc_info *ssc_p = &ssc_info[cpu_dai->id];
301
302 switch (div_id) {
303 case ATMEL_SSC_CMR_DIV:
304 /*
305 * The same master clock divider is used for both
306 * transmit and receive, so if a value has already
307 * been set, it must match this value.
308 */
309 if (ssc_p->cmr_div == 0)
310 ssc_p->cmr_div = div;
311 else
312 if (div != ssc_p->cmr_div)
313 return -EBUSY;
314 break;
315
316 case ATMEL_SSC_TCMR_PERIOD:
317 ssc_p->tcmr_period = div;
318 break;
319
320 case ATMEL_SSC_RCMR_PERIOD:
321 ssc_p->rcmr_period = div;
322 break;
323
324 default:
325 return -EINVAL;
326 }
327
328 return 0;
329}
330
331/*
332 * Configure the SSC.
333 */
334static int atmel_ssc_hw_params(struct snd_pcm_substream *substream,
335 struct snd_pcm_hw_params *params)
336{
337 struct snd_soc_pcm_runtime *rtd = snd_pcm_substream_chip(substream);
338 int id = rtd->dai->cpu_dai->id;
339 struct atmel_ssc_info *ssc_p = &ssc_info[id];
340 struct atmel_pcm_dma_params *dma_params;
341 int dir, channels, bits;
342 u32 tfmr, rfmr, tcmr, rcmr;
343 int start_event;
344 int ret;
345
346 /*
347 * Currently, there is only one set of dma params for
348 * each direction. If more are added, this code will
349 * have to be changed to select the proper set.
350 */
351 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
352 dir = 0;
353 else
354 dir = 1;
355
356 dma_params = &ssc_dma_params[id][dir];
357 dma_params->ssc = ssc_p->ssc;
358 dma_params->substream = substream;
359
360 ssc_p->dma_params[dir] = dma_params;
361
362 /*
363 * The cpu_dai->dma_data field is only used to communicate the
364 * appropriate DMA parameters to the pcm driver hw_params()
365 * function. It should not be used for other purposes
366 * as it is common to all substreams.
367 */
368 rtd->dai->cpu_dai->dma_data = dma_params;
369
370 channels = params_channels(params);
371
372 /*
373 * Determine sample size in bits and the PDC increment.
374 */
375 switch (params_format(params)) {
376 case SNDRV_PCM_FORMAT_S8:
377 bits = 8;
378 dma_params->pdc_xfer_size = 1;
379 break;
380 case SNDRV_PCM_FORMAT_S16_LE:
381 bits = 16;
382 dma_params->pdc_xfer_size = 2;
383 break;
384 case SNDRV_PCM_FORMAT_S24_LE:
385 bits = 24;
386 dma_params->pdc_xfer_size = 4;
387 break;
388 case SNDRV_PCM_FORMAT_S32_LE:
389 bits = 32;
390 dma_params->pdc_xfer_size = 4;
391 break;
392 default:
393 printk(KERN_WARNING "atmel_ssc_dai: unsupported PCM format");
394 return -EINVAL;
395 }
396
397 /*
398 * The SSC only supports up to 16-bit samples in I2S format, due
399 * to the size of the Frame Mode Register FSLEN field.
400 */
401 if ((ssc_p->daifmt & SND_SOC_DAIFMT_FORMAT_MASK) == SND_SOC_DAIFMT_I2S
402 && bits > 16) {
403 printk(KERN_WARNING
404 "atmel_ssc_dai: sample size %d"
405 "is too large for I2S\n", bits);
406 return -EINVAL;
407 }
408
409 /*
410 * Compute SSC register settings.
411 */
412 switch (ssc_p->daifmt
413 & (SND_SOC_DAIFMT_FORMAT_MASK | SND_SOC_DAIFMT_MASTER_MASK)) {
414
415 case SND_SOC_DAIFMT_I2S | SND_SOC_DAIFMT_CBS_CFS:
416 /*
417 * I2S format, SSC provides BCLK and LRC clocks.
418 *
419 * The SSC transmit and receive clocks are generated
420 * from the MCK divider, and the BCLK signal
421 * is output on the SSC TK line.
422 */
423 rcmr = SSC_BF(RCMR_PERIOD, ssc_p->rcmr_period)
424 | SSC_BF(RCMR_STTDLY, START_DELAY)
425 | SSC_BF(RCMR_START, SSC_START_FALLING_RF)
426 | SSC_BF(RCMR_CKI, SSC_CKI_RISING)
427 | SSC_BF(RCMR_CKO, SSC_CKO_NONE)
428 | SSC_BF(RCMR_CKS, SSC_CKS_DIV);
429
430 rfmr = SSC_BF(RFMR_FSEDGE, SSC_FSEDGE_POSITIVE)
431 | SSC_BF(RFMR_FSOS, SSC_FSOS_NEGATIVE)
432 | SSC_BF(RFMR_FSLEN, (bits - 1))
433 | SSC_BF(RFMR_DATNB, (channels - 1))
434 | SSC_BIT(RFMR_MSBF)
435 | SSC_BF(RFMR_LOOP, 0)
436 | SSC_BF(RFMR_DATLEN, (bits - 1));
437
438 tcmr = SSC_BF(TCMR_PERIOD, ssc_p->tcmr_period)
439 | SSC_BF(TCMR_STTDLY, START_DELAY)
440 | SSC_BF(TCMR_START, SSC_START_FALLING_RF)
441 | SSC_BF(TCMR_CKI, SSC_CKI_FALLING)
442 | SSC_BF(TCMR_CKO, SSC_CKO_CONTINUOUS)
443 | SSC_BF(TCMR_CKS, SSC_CKS_DIV);
444
445 tfmr = SSC_BF(TFMR_FSEDGE, SSC_FSEDGE_POSITIVE)
446 | SSC_BF(TFMR_FSDEN, 0)
447 | SSC_BF(TFMR_FSOS, SSC_FSOS_NEGATIVE)
448 | SSC_BF(TFMR_FSLEN, (bits - 1))
449 | SSC_BF(TFMR_DATNB, (channels - 1))
450 | SSC_BIT(TFMR_MSBF)
451 | SSC_BF(TFMR_DATDEF, 0)
452 | SSC_BF(TFMR_DATLEN, (bits - 1));
453 break;
454
455 case SND_SOC_DAIFMT_I2S | SND_SOC_DAIFMT_CBM_CFM:
456 /*
457 * I2S format, CODEC supplies BCLK and LRC clocks.
458 *
459 * The SSC transmit clock is obtained from the BCLK signal on
460 * on the TK line, and the SSC receive clock is
461 * generated from the transmit clock.
462 *
463 * For single channel data, one sample is transferred
464 * on the falling edge of the LRC clock.
465 * For two channel data, one sample is
466 * transferred on both edges of the LRC clock.
467 */
468 start_event = ((channels == 1)
469 ? SSC_START_FALLING_RF
470 : SSC_START_EDGE_RF);
471
472 rcmr = SSC_BF(RCMR_PERIOD, 0)
473 | SSC_BF(RCMR_STTDLY, START_DELAY)
474 | SSC_BF(RCMR_START, start_event)
475 | SSC_BF(RCMR_CKI, SSC_CKI_RISING)
476 | SSC_BF(RCMR_CKO, SSC_CKO_NONE)
477 | SSC_BF(RCMR_CKS, SSC_CKS_CLOCK);
478
479 rfmr = SSC_BF(RFMR_FSEDGE, SSC_FSEDGE_POSITIVE)
480 | SSC_BF(RFMR_FSOS, SSC_FSOS_NONE)
481 | SSC_BF(RFMR_FSLEN, 0)
482 | SSC_BF(RFMR_DATNB, 0)
483 | SSC_BIT(RFMR_MSBF)
484 | SSC_BF(RFMR_LOOP, 0)
485 | SSC_BF(RFMR_DATLEN, (bits - 1));
486
487 tcmr = SSC_BF(TCMR_PERIOD, 0)
488 | SSC_BF(TCMR_STTDLY, START_DELAY)
489 | SSC_BF(TCMR_START, start_event)
490 | SSC_BF(TCMR_CKI, SSC_CKI_FALLING)
491 | SSC_BF(TCMR_CKO, SSC_CKO_NONE)
492 | SSC_BF(TCMR_CKS, SSC_CKS_PIN);
493
494 tfmr = SSC_BF(TFMR_FSEDGE, SSC_FSEDGE_POSITIVE)
495 | SSC_BF(TFMR_FSDEN, 0)
496 | SSC_BF(TFMR_FSOS, SSC_FSOS_NONE)
497 | SSC_BF(TFMR_FSLEN, 0)
498 | SSC_BF(TFMR_DATNB, 0)
499 | SSC_BIT(TFMR_MSBF)
500 | SSC_BF(TFMR_DATDEF, 0)
501 | SSC_BF(TFMR_DATLEN, (bits - 1));
502 break;
503
504 case SND_SOC_DAIFMT_DSP_A | SND_SOC_DAIFMT_CBS_CFS:
505 /*
506 * DSP/PCM Mode A format, SSC provides BCLK and LRC clocks.
507 *
508 * The SSC transmit and receive clocks are generated from the
509 * MCK divider, and the BCLK signal is output
510 * on the SSC TK line.
511 */
512 rcmr = SSC_BF(RCMR_PERIOD, ssc_p->rcmr_period)
513 | SSC_BF(RCMR_STTDLY, 1)
514 | SSC_BF(RCMR_START, SSC_START_RISING_RF)
515 | SSC_BF(RCMR_CKI, SSC_CKI_RISING)
516 | SSC_BF(RCMR_CKO, SSC_CKO_NONE)
517 | SSC_BF(RCMR_CKS, SSC_CKS_DIV);
518
519 rfmr = SSC_BF(RFMR_FSEDGE, SSC_FSEDGE_POSITIVE)
520 | SSC_BF(RFMR_FSOS, SSC_FSOS_POSITIVE)
521 | SSC_BF(RFMR_FSLEN, 0)
522 | SSC_BF(RFMR_DATNB, (channels - 1))
523 | SSC_BIT(RFMR_MSBF)
524 | SSC_BF(RFMR_LOOP, 0)
525 | SSC_BF(RFMR_DATLEN, (bits - 1));
526
527 tcmr = SSC_BF(TCMR_PERIOD, ssc_p->tcmr_period)
528 | SSC_BF(TCMR_STTDLY, 1)
529 | SSC_BF(TCMR_START, SSC_START_RISING_RF)
530 | SSC_BF(TCMR_CKI, SSC_CKI_RISING)
531 | SSC_BF(TCMR_CKO, SSC_CKO_CONTINUOUS)
532 | SSC_BF(TCMR_CKS, SSC_CKS_DIV);
533
534 tfmr = SSC_BF(TFMR_FSEDGE, SSC_FSEDGE_POSITIVE)
535 | SSC_BF(TFMR_FSDEN, 0)
536 | SSC_BF(TFMR_FSOS, SSC_FSOS_POSITIVE)
537 | SSC_BF(TFMR_FSLEN, 0)
538 | SSC_BF(TFMR_DATNB, (channels - 1))
539 | SSC_BIT(TFMR_MSBF)
540 | SSC_BF(TFMR_DATDEF, 0)
541 | SSC_BF(TFMR_DATLEN, (bits - 1));
542 break;
543
544 case SND_SOC_DAIFMT_DSP_A | SND_SOC_DAIFMT_CBM_CFM:
545 default:
546 printk(KERN_WARNING "atmel_ssc_dai: unsupported DAI format 0x%x\n",
547 ssc_p->daifmt);
548 return -EINVAL;
549 break;
550 }
551 pr_debug("atmel_ssc_hw_params: "
552 "RCMR=%08x RFMR=%08x TCMR=%08x TFMR=%08x\n",
553 rcmr, rfmr, tcmr, tfmr);
554
555 if (!ssc_p->initialized) {
556
557 /* Enable PMC peripheral clock for this SSC */
558 pr_debug("atmel_ssc_dai: Starting clock\n");
559 clk_enable(ssc_p->ssc->clk);
560
561 /* Reset the SSC and its PDC registers */
562 ssc_writel(ssc_p->ssc->regs, CR, SSC_BIT(CR_SWRST));
563
564 ssc_writel(ssc_p->ssc->regs, PDC_RPR, 0);
565 ssc_writel(ssc_p->ssc->regs, PDC_RCR, 0);
566 ssc_writel(ssc_p->ssc->regs, PDC_RNPR, 0);
567 ssc_writel(ssc_p->ssc->regs, PDC_RNCR, 0);
568
569 ssc_writel(ssc_p->ssc->regs, PDC_TPR, 0);
570 ssc_writel(ssc_p->ssc->regs, PDC_TCR, 0);
571 ssc_writel(ssc_p->ssc->regs, PDC_TNPR, 0);
572 ssc_writel(ssc_p->ssc->regs, PDC_TNCR, 0);
573
574 ret = request_irq(ssc_p->ssc->irq, atmel_ssc_interrupt, 0,
575 ssc_p->name, ssc_p);
576 if (ret < 0) {
577 printk(KERN_WARNING
578 "atmel_ssc_dai: request_irq failure\n");
579 pr_debug("Atmel_ssc_dai: Stoping clock\n");
580 clk_disable(ssc_p->ssc->clk);
581 return ret;
582 }
583
584 ssc_p->initialized = 1;
585 }
586
587 /* set SSC clock mode register */
588 ssc_writel(ssc_p->ssc->regs, CMR, ssc_p->cmr_div);
589
590 /* set receive clock mode and format */
591 ssc_writel(ssc_p->ssc->regs, RCMR, rcmr);
592 ssc_writel(ssc_p->ssc->regs, RFMR, rfmr);
593
594 /* set transmit clock mode and format */
595 ssc_writel(ssc_p->ssc->regs, TCMR, tcmr);
596 ssc_writel(ssc_p->ssc->regs, TFMR, tfmr);
597
598 pr_debug("atmel_ssc_dai,hw_params: SSC initialized\n");
599 return 0;
600}
601
602
603static int atmel_ssc_prepare(struct snd_pcm_substream *substream)
604{
605 struct snd_soc_pcm_runtime *rtd = snd_pcm_substream_chip(substream);
606 struct atmel_ssc_info *ssc_p = &ssc_info[rtd->dai->cpu_dai->id];
607 struct atmel_pcm_dma_params *dma_params;
608 int dir;
609
610 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
611 dir = 0;
612 else
613 dir = 1;
614
615 dma_params = ssc_p->dma_params[dir];
616
617 ssc_writel(ssc_p->ssc->regs, CR, dma_params->mask->ssc_enable);
618
619 pr_debug("%s enabled SSC_SR=0x%08x\n",
620 dir ? "receive" : "transmit",
621 ssc_readl(ssc_p->ssc->regs, SR));
622 return 0;
623}
624
625
626#ifdef CONFIG_PM
627static int atmel_ssc_suspend(struct platform_device *pdev,
628 struct snd_soc_dai *cpu_dai)
629{
630 struct atmel_ssc_info *ssc_p;
631
632 if (!cpu_dai->active)
633 return 0;
634
635 ssc_p = &ssc_info[cpu_dai->id];
636
637 /* Save the status register before disabling transmit and receive */
638 ssc_p->ssc_state.ssc_sr = ssc_readl(ssc_p->ssc->regs, SR);
639 ssc_writel(ssc_p->ssc->regs, CR, SSC_BIT(CR_TXDIS) | SSC_BIT(CR_RXDIS));
640
641 /* Save the current interrupt mask, then disable unmasked interrupts */
642 ssc_p->ssc_state.ssc_imr = ssc_readl(ssc_p->ssc->regs, IMR);
643 ssc_writel(ssc_p->ssc->regs, IDR, ssc_p->ssc_state.ssc_imr);
644
645 ssc_p->ssc_state.ssc_cmr = ssc_readl(ssc_p->ssc->regs, CMR);
646 ssc_p->ssc_state.ssc_rcmr = ssc_readl(ssc_p->ssc->regs, RCMR);
647 ssc_p->ssc_state.ssc_rfmr = ssc_readl(ssc_p->ssc->regs, RFMR);
648 ssc_p->ssc_state.ssc_tcmr = ssc_readl(ssc_p->ssc->regs, TCMR);
649 ssc_p->ssc_state.ssc_tfmr = ssc_readl(ssc_p->ssc->regs, TFMR);
650
651 return 0;
652}
653
654
655
656static int atmel_ssc_resume(struct platform_device *pdev,
657 struct snd_soc_dai *cpu_dai)
658{
659 struct atmel_ssc_info *ssc_p;
660 u32 cr;
661
662 if (!cpu_dai->active)
663 return 0;
664
665 ssc_p = &ssc_info[cpu_dai->id];
666
667 /* restore SSC register settings */
668 ssc_writel(ssc_p->ssc->regs, TFMR, ssc_p->ssc_state.ssc_tfmr);
669 ssc_writel(ssc_p->ssc->regs, TCMR, ssc_p->ssc_state.ssc_tcmr);
670 ssc_writel(ssc_p->ssc->regs, RFMR, ssc_p->ssc_state.ssc_rfmr);
671 ssc_writel(ssc_p->ssc->regs, RCMR, ssc_p->ssc_state.ssc_rcmr);
672 ssc_writel(ssc_p->ssc->regs, CMR, ssc_p->ssc_state.ssc_cmr);
673
674 /* re-enable interrupts */
675 ssc_writel(ssc_p->ssc->regs, IER, ssc_p->ssc_state.ssc_imr);
676
677 /* Re-enable recieve and transmit as appropriate */
678 cr = 0;
679 cr |=
680 (ssc_p->ssc_state.ssc_sr & SSC_BIT(SR_RXEN)) ? SSC_BIT(CR_RXEN) : 0;
681 cr |=
682 (ssc_p->ssc_state.ssc_sr & SSC_BIT(SR_TXEN)) ? SSC_BIT(CR_TXEN) : 0;
683 ssc_writel(ssc_p->ssc->regs, CR, cr);
684
685 return 0;
686}
687#else /* CONFIG_PM */
688# define atmel_ssc_suspend NULL
689# define atmel_ssc_resume NULL
690#endif /* CONFIG_PM */
691
692
693#define ATMEL_SSC_RATES (SNDRV_PCM_RATE_8000_96000)
694
695#define ATMEL_SSC_FORMATS (SNDRV_PCM_FMTBIT_S8 | SNDRV_PCM_FMTBIT_S16_LE |\
696 SNDRV_PCM_FMTBIT_S24_LE | SNDRV_PCM_FMTBIT_S32_LE)
697
698struct snd_soc_dai atmel_ssc_dai[NUM_SSC_DEVICES] = {
699 { .name = "atmel-ssc0",
700 .id = 0,
701 .type = SND_SOC_DAI_PCM,
702 .suspend = atmel_ssc_suspend,
703 .resume = atmel_ssc_resume,
704 .playback = {
705 .channels_min = 1,
706 .channels_max = 2,
707 .rates = ATMEL_SSC_RATES,
708 .formats = ATMEL_SSC_FORMATS,},
709 .capture = {
710 .channels_min = 1,
711 .channels_max = 2,
712 .rates = ATMEL_SSC_RATES,
713 .formats = ATMEL_SSC_FORMATS,},
714 .ops = {
715 .startup = atmel_ssc_startup,
716 .shutdown = atmel_ssc_shutdown,
717 .prepare = atmel_ssc_prepare,
718 .hw_params = atmel_ssc_hw_params,},
719 .dai_ops = {
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 .type = SND_SOC_DAI_PCM,
728 .suspend = atmel_ssc_suspend,
729 .resume = atmel_ssc_resume,
730 .playback = {
731 .channels_min = 1,
732 .channels_max = 2,
733 .rates = ATMEL_SSC_RATES,
734 .formats = ATMEL_SSC_FORMATS,},
735 .capture = {
736 .channels_min = 1,
737 .channels_max = 2,
738 .rates = ATMEL_SSC_RATES,
739 .formats = ATMEL_SSC_FORMATS,},
740 .ops = {
741 .startup = atmel_ssc_startup,
742 .shutdown = atmel_ssc_shutdown,
743 .prepare = atmel_ssc_prepare,
744 .hw_params = atmel_ssc_hw_params,},
745 .dai_ops = {
746 .set_fmt = atmel_ssc_set_dai_fmt,
747 .set_clkdiv = atmel_ssc_set_dai_clkdiv,},
748 .private_data = &ssc_info[1],
749 },
750 { .name = "atmel-ssc2",
751 .id = 2,
752 .type = SND_SOC_DAI_PCM,
753 .suspend = atmel_ssc_suspend,
754 .resume = atmel_ssc_resume,
755 .playback = {
756 .channels_min = 1,
757 .channels_max = 2,
758 .rates = ATMEL_SSC_RATES,
759 .formats = ATMEL_SSC_FORMATS,},
760 .capture = {
761 .channels_min = 1,
762 .channels_max = 2,
763 .rates = ATMEL_SSC_RATES,
764 .formats = ATMEL_SSC_FORMATS,},
765 .ops = {
766 .startup = atmel_ssc_startup,
767 .shutdown = atmel_ssc_shutdown,
768 .prepare = atmel_ssc_prepare,
769 .hw_params = atmel_ssc_hw_params,},
770 .dai_ops = {
771 .set_fmt = atmel_ssc_set_dai_fmt,
772 .set_clkdiv = atmel_ssc_set_dai_clkdiv,},
773 .private_data = &ssc_info[2],
774 },
775#endif
776};
777EXPORT_SYMBOL_GPL(atmel_ssc_dai);
778
779/* Module information */
780MODULE_AUTHOR("Sedji Gaouaou, sedji.gaouaou@atmel.com, www.atmel.com");
781MODULE_DESCRIPTION("ATMEL SSC ASoC Interface");
782MODULE_LICENSE("GPL");
generated by cgit v1.2.2 (git 2.25.0) at 2024-12-02 11:39:06 -0500