1// SPDX-License-Identifier: GPL-2.0
2//
3// Freescale ESAI ALSA SoC Digital Audio Interface (DAI) driver
4//
5// Copyright (C) 2014 Freescale Semiconductor, Inc.
6
7#include <linux/clk.h>
8#include <linux/dmaengine.h>
9#include <linux/module.h>
10#include <linux/of_irq.h>
11#include <linux/of_platform.h>
12#include <linux/pm_runtime.h>
13#include <sound/dmaengine_pcm.h>
14#include <sound/pcm_params.h>
15
16#include "fsl_esai.h"
17#include "imx-pcm.h"
18
19#define FSL_ESAI_FORMATS (SNDRV_PCM_FMTBIT_S8 | \
20 SNDRV_PCM_FMTBIT_S16_LE | \
21 SNDRV_PCM_FMTBIT_S20_3LE | \
22 SNDRV_PCM_FMTBIT_S24_LE)
23
24/**
25 * struct fsl_esai_soc_data - soc specific data
26 * @reset_at_xrun: flags for enable reset operaton
27 */
28struct fsl_esai_soc_data {
29 bool reset_at_xrun;
30};
31
32/**
33 * struct fsl_esai - ESAI private data
34 * @dma_params_rx: DMA parameters for receive channel
35 * @dma_params_tx: DMA parameters for transmit channel
36 * @pdev: platform device pointer
37 * @regmap: regmap handler
38 * @coreclk: clock source to access register
39 * @extalclk: esai clock source to derive HCK, SCK and FS
40 * @fsysclk: system clock source to derive HCK, SCK and FS
41 * @spbaclk: SPBA clock (optional, depending on SoC design)
42 * @work: work to handle the reset operation
43 * @soc: soc specific data
44 * @lock: spin lock between hw_reset() and trigger()
45 * @fifo_depth: depth of tx/rx FIFO
46 * @slot_width: width of each DAI slot
47 * @slots: number of slots
48 * @tx_mask: slot mask for TX
49 * @rx_mask: slot mask for RX
50 * @channels: channel num for tx or rx
51 * @hck_rate: clock rate of desired HCKx clock
52 * @sck_rate: clock rate of desired SCKx clock
53 * @hck_dir: the direction of HCKx pads
54 * @sck_div: if using PSR/PM dividers for SCKx clock
55 * @consumer_mode: if fully using DAI clock consumer mode
56 * @synchronous: if using tx/rx synchronous mode
57 * @name: driver name
58 */
59struct fsl_esai {
60 struct snd_dmaengine_dai_dma_data dma_params_rx;
61 struct snd_dmaengine_dai_dma_data dma_params_tx;
62 struct platform_device *pdev;
63 struct regmap *regmap;
64 struct clk *coreclk;
65 struct clk *extalclk;
66 struct clk *fsysclk;
67 struct clk *spbaclk;
68 struct work_struct work;
69 const struct fsl_esai_soc_data *soc;
70 spinlock_t lock; /* Protect hw_reset and trigger */
71 u32 fifo_depth;
72 u32 slot_width;
73 u32 slots;
74 u32 tx_mask;
75 u32 rx_mask;
76 u32 channels[2];
77 u32 hck_rate[2];
78 u32 sck_rate[2];
79 bool hck_dir[2];
80 bool sck_div[2];
81 bool consumer_mode;
82 bool synchronous;
83 char name[32];
84};
85
86static struct fsl_esai_soc_data fsl_esai_vf610 = {
87 .reset_at_xrun = true,
88};
89
90static struct fsl_esai_soc_data fsl_esai_imx35 = {
91 .reset_at_xrun = true,
92};
93
94static struct fsl_esai_soc_data fsl_esai_imx6ull = {
95 .reset_at_xrun = false,
96};
97
98static irqreturn_t esai_isr(int irq, void *devid)
99{
100 struct fsl_esai *esai_priv = (struct fsl_esai *)devid;
101 struct platform_device *pdev = esai_priv->pdev;
102 u32 esr;
103 u32 saisr;
104
105 regmap_read(map: esai_priv->regmap, REG_ESAI_ESR, val: &esr);
106 regmap_read(map: esai_priv->regmap, REG_ESAI_SAISR, val: &saisr);
107
108 if ((saisr & (ESAI_SAISR_TUE | ESAI_SAISR_ROE)) &&
109 esai_priv->soc->reset_at_xrun) {
110 dev_dbg(&pdev->dev, "reset module for xrun\n");
111 regmap_update_bits(map: esai_priv->regmap, REG_ESAI_TCR,
112 ESAI_xCR_xEIE_MASK, val: 0);
113 regmap_update_bits(map: esai_priv->regmap, REG_ESAI_RCR,
114 ESAI_xCR_xEIE_MASK, val: 0);
115 schedule_work(work: &esai_priv->work);
116 }
117
118 if (esr & ESAI_ESR_TINIT_MASK)
119 dev_dbg(&pdev->dev, "isr: Transmission Initialized\n");
120
121 if (esr & ESAI_ESR_RFF_MASK)
122 dev_dbg(&pdev->dev, "isr: Receiving overrun\n");
123
124 if (esr & ESAI_ESR_TFE_MASK)
125 dev_dbg(&pdev->dev, "isr: Transmission underrun\n");
126
127 if (esr & ESAI_ESR_TLS_MASK)
128 dev_dbg(&pdev->dev, "isr: Just transmitted the last slot\n");
129
130 if (esr & ESAI_ESR_TDE_MASK)
131 dev_dbg(&pdev->dev, "isr: Transmission data exception\n");
132
133 if (esr & ESAI_ESR_TED_MASK)
134 dev_dbg(&pdev->dev, "isr: Transmitting even slots\n");
135
136 if (esr & ESAI_ESR_TD_MASK)
137 dev_dbg(&pdev->dev, "isr: Transmitting data\n");
138
139 if (esr & ESAI_ESR_RLS_MASK)
140 dev_dbg(&pdev->dev, "isr: Just received the last slot\n");
141
142 if (esr & ESAI_ESR_RDE_MASK)
143 dev_dbg(&pdev->dev, "isr: Receiving data exception\n");
144
145 if (esr & ESAI_ESR_RED_MASK)
146 dev_dbg(&pdev->dev, "isr: Receiving even slots\n");
147
148 if (esr & ESAI_ESR_RD_MASK)
149 dev_dbg(&pdev->dev, "isr: Receiving data\n");
150
151 return IRQ_HANDLED;
152}
153
154/**
155 * fsl_esai_divisor_cal - This function is used to calculate the
156 * divisors of psr, pm, fp and it is supposed to be called in
157 * set_dai_sysclk() and set_bclk().
158 *
159 * @dai: pointer to DAI
160 * @tx: current setting is for playback or capture
161 * @ratio: desired overall ratio for the paticipating dividers
162 * @usefp: for HCK setting, there is no need to set fp divider
163 * @fp: bypass other dividers by setting fp directly if fp != 0
164 */
165static int fsl_esai_divisor_cal(struct snd_soc_dai *dai, bool tx, u32 ratio,
166 bool usefp, u32 fp)
167{
168 struct fsl_esai *esai_priv = snd_soc_dai_get_drvdata(dai);
169 u32 psr, pm = 999, maxfp, prod, sub, savesub, i, j;
170
171 maxfp = usefp ? 16 : 1;
172
173 if (usefp && fp)
174 goto out_fp;
175
176 if (ratio > 2 * 8 * 256 * maxfp || ratio < 2) {
177 dev_err(dai->dev, "the ratio is out of range (2 ~ %d)\n",
178 2 * 8 * 256 * maxfp);
179 return -EINVAL;
180 } else if (ratio % 2) {
181 dev_err(dai->dev, "the raio must be even if using upper divider\n");
182 return -EINVAL;
183 }
184
185 ratio /= 2;
186
187 psr = ratio <= 256 * maxfp ? ESAI_xCCR_xPSR_BYPASS : ESAI_xCCR_xPSR_DIV8;
188
189 /* Do not loop-search if PM (1 ~ 256) alone can serve the ratio */
190 if (ratio <= 256) {
191 pm = ratio;
192 fp = 1;
193 goto out;
194 }
195
196 /* Set the max fluctuation -- 0.1% of the max devisor */
197 savesub = (psr ? 1 : 8) * 256 * maxfp / 1000;
198
199 /* Find the best value for PM */
200 for (i = 1; i <= 256; i++) {
201 for (j = 1; j <= maxfp; j++) {
202 /* PSR (1 or 8) * PM (1 ~ 256) * FP (1 ~ 16) */
203 prod = (psr ? 1 : 8) * i * j;
204
205 if (prod == ratio)
206 sub = 0;
207 else if (prod / ratio == 1)
208 sub = prod - ratio;
209 else if (ratio / prod == 1)
210 sub = ratio - prod;
211 else
212 continue;
213
214 /* Calculate the fraction */
215 sub = sub * 1000 / ratio;
216 if (sub < savesub) {
217 savesub = sub;
218 pm = i;
219 fp = j;
220 }
221
222 /* We are lucky */
223 if (savesub == 0)
224 goto out;
225 }
226 }
227
228 if (pm == 999) {
229 dev_err(dai->dev, "failed to calculate proper divisors\n");
230 return -EINVAL;
231 }
232
233out:
234 regmap_update_bits(map: esai_priv->regmap, REG_ESAI_xCCR(tx),
235 ESAI_xCCR_xPSR_MASK | ESAI_xCCR_xPM_MASK,
236 val: psr | ESAI_xCCR_xPM(pm));
237
238out_fp:
239 /* Bypass fp if not being required */
240 if (maxfp <= 1)
241 return 0;
242
243 regmap_update_bits(map: esai_priv->regmap, REG_ESAI_xCCR(tx),
244 ESAI_xCCR_xFP_MASK, ESAI_xCCR_xFP(fp));
245
246 return 0;
247}
248
249/**
250 * fsl_esai_set_dai_sysclk - configure the clock frequency of MCLK (HCKT/HCKR)
251 * @dai: pointer to DAI
252 * @clk_id: The clock source of HCKT/HCKR
253 * (Input from outside; output from inside, FSYS or EXTAL)
254 * @freq: The required clock rate of HCKT/HCKR
255 * @dir: The clock direction of HCKT/HCKR
256 *
257 * Note: If the direction is input, we do not care about clk_id.
258 */
259static int fsl_esai_set_dai_sysclk(struct snd_soc_dai *dai, int clk_id,
260 unsigned int freq, int dir)
261{
262 struct fsl_esai *esai_priv = snd_soc_dai_get_drvdata(dai);
263 struct clk *clksrc = esai_priv->extalclk;
264 bool tx = (clk_id <= ESAI_HCKT_EXTAL || esai_priv->synchronous);
265 bool in = dir == SND_SOC_CLOCK_IN;
266 u32 ratio, ecr = 0;
267 unsigned long clk_rate;
268 int ret;
269
270 if (freq == 0) {
271 dev_err(dai->dev, "%sput freq of HCK%c should not be 0Hz\n",
272 in ? "in" : "out", tx ? 'T' : 'R');
273 return -EINVAL;
274 }
275
276 /* Bypass divider settings if the requirement doesn't change */
277 if (freq == esai_priv->hck_rate[tx] && dir == esai_priv->hck_dir[tx])
278 return 0;
279
280 /* sck_div can be only bypassed if ETO/ERO=0 and SNC_SOC_CLOCK_OUT */
281 esai_priv->sck_div[tx] = true;
282
283 /* Set the direction of HCKT/HCKR pins */
284 regmap_update_bits(map: esai_priv->regmap, REG_ESAI_xCCR(tx),
285 ESAI_xCCR_xHCKD, val: in ? 0 : ESAI_xCCR_xHCKD);
286
287 if (in)
288 goto out;
289
290 switch (clk_id) {
291 case ESAI_HCKT_FSYS:
292 case ESAI_HCKR_FSYS:
293 clksrc = esai_priv->fsysclk;
294 break;
295 case ESAI_HCKT_EXTAL:
296 ecr |= ESAI_ECR_ETI;
297 break;
298 case ESAI_HCKR_EXTAL:
299 ecr |= esai_priv->synchronous ? ESAI_ECR_ETI : ESAI_ECR_ERI;
300 break;
301 default:
302 return -EINVAL;
303 }
304
305 if (IS_ERR(ptr: clksrc)) {
306 dev_err(dai->dev, "no assigned %s clock\n",
307 (clk_id % 2) ? "extal" : "fsys");
308 return PTR_ERR(ptr: clksrc);
309 }
310 clk_rate = clk_get_rate(clk: clksrc);
311
312 ratio = clk_rate / freq;
313 if (ratio * freq > clk_rate)
314 ret = ratio * freq - clk_rate;
315 else if (ratio * freq < clk_rate)
316 ret = clk_rate - ratio * freq;
317 else
318 ret = 0;
319
320 /* Block if clock source can not be divided into the required rate */
321 if (ret != 0 && clk_rate / ret < 1000) {
322 dev_err(dai->dev, "failed to derive required HCK%c rate\n",
323 tx ? 'T' : 'R');
324 return -EINVAL;
325 }
326
327 /* Only EXTAL source can be output directly without using PSR and PM */
328 if (ratio == 1 && clksrc == esai_priv->extalclk) {
329 /* Bypass all the dividers if not being needed */
330 ecr |= tx ? ESAI_ECR_ETO : ESAI_ECR_ERO;
331 goto out;
332 } else if (ratio < 2) {
333 /* The ratio should be no less than 2 if using other sources */
334 dev_err(dai->dev, "failed to derive required HCK%c rate\n",
335 tx ? 'T' : 'R');
336 return -EINVAL;
337 }
338
339 ret = fsl_esai_divisor_cal(dai, tx, ratio, usefp: false, fp: 0);
340 if (ret)
341 return ret;
342
343 esai_priv->sck_div[tx] = false;
344
345out:
346 esai_priv->hck_dir[tx] = dir;
347 esai_priv->hck_rate[tx] = freq;
348
349 regmap_update_bits(map: esai_priv->regmap, REG_ESAI_ECR,
350 mask: tx ? ESAI_ECR_ETI | ESAI_ECR_ETO :
351 ESAI_ECR_ERI | ESAI_ECR_ERO, val: ecr);
352
353 return 0;
354}
355
356/**
357 * fsl_esai_set_bclk - configure the related dividers according to the bclk rate
358 * @dai: pointer to DAI
359 * @tx: direction boolean
360 * @freq: bclk freq
361 */
362static int fsl_esai_set_bclk(struct snd_soc_dai *dai, bool tx, u32 freq)
363{
364 struct fsl_esai *esai_priv = snd_soc_dai_get_drvdata(dai);
365 u32 hck_rate = esai_priv->hck_rate[tx];
366 u32 sub, ratio = hck_rate / freq;
367 int ret;
368
369 /* Don't apply for fully consumer mode or unchanged bclk */
370 if (esai_priv->consumer_mode || esai_priv->sck_rate[tx] == freq)
371 return 0;
372
373 if (ratio * freq > hck_rate)
374 sub = ratio * freq - hck_rate;
375 else if (ratio * freq < hck_rate)
376 sub = hck_rate - ratio * freq;
377 else
378 sub = 0;
379
380 /* Block if clock source can not be divided into the required rate */
381 if (sub != 0 && hck_rate / sub < 1000) {
382 dev_err(dai->dev, "failed to derive required SCK%c rate\n",
383 tx ? 'T' : 'R');
384 return -EINVAL;
385 }
386
387 /* The ratio should be contented by FP alone if bypassing PM and PSR */
388 if (!esai_priv->sck_div[tx] && (ratio > 16 || ratio == 0)) {
389 dev_err(dai->dev, "the ratio is out of range (1 ~ 16)\n");
390 return -EINVAL;
391 }
392
393 ret = fsl_esai_divisor_cal(dai, tx, ratio, usefp: true,
394 fp: esai_priv->sck_div[tx] ? 0 : ratio);
395 if (ret)
396 return ret;
397
398 /* Save current bclk rate */
399 esai_priv->sck_rate[tx] = freq;
400
401 return 0;
402}
403
404static int fsl_esai_set_dai_tdm_slot(struct snd_soc_dai *dai, u32 tx_mask,
405 u32 rx_mask, int slots, int slot_width)
406{
407 struct fsl_esai *esai_priv = snd_soc_dai_get_drvdata(dai);
408
409 regmap_update_bits(map: esai_priv->regmap, REG_ESAI_TCCR,
410 ESAI_xCCR_xDC_MASK, ESAI_xCCR_xDC(slots));
411
412 regmap_update_bits(map: esai_priv->regmap, REG_ESAI_RCCR,
413 ESAI_xCCR_xDC_MASK, ESAI_xCCR_xDC(slots));
414
415 esai_priv->slot_width = slot_width;
416 esai_priv->slots = slots;
417 esai_priv->tx_mask = tx_mask;
418 esai_priv->rx_mask = rx_mask;
419
420 return 0;
421}
422
423static int fsl_esai_set_dai_fmt(struct snd_soc_dai *dai, unsigned int fmt)
424{
425 struct fsl_esai *esai_priv = snd_soc_dai_get_drvdata(dai);
426 u32 xcr = 0, xccr = 0, mask;
427
428 /* DAI mode */
429 switch (fmt & SND_SOC_DAIFMT_FORMAT_MASK) {
430 case SND_SOC_DAIFMT_I2S:
431 /* Data on rising edge of bclk, frame low, 1clk before data */
432 xcr |= ESAI_xCR_xFSR;
433 xccr |= ESAI_xCCR_xFSP | ESAI_xCCR_xCKP | ESAI_xCCR_xHCKP;
434 break;
435 case SND_SOC_DAIFMT_LEFT_J:
436 /* Data on rising edge of bclk, frame high */
437 xccr |= ESAI_xCCR_xCKP | ESAI_xCCR_xHCKP;
438 break;
439 case SND_SOC_DAIFMT_RIGHT_J:
440 /* Data on rising edge of bclk, frame high, right aligned */
441 xccr |= ESAI_xCCR_xCKP | ESAI_xCCR_xHCKP;
442 xcr |= ESAI_xCR_xWA;
443 break;
444 case SND_SOC_DAIFMT_DSP_A:
445 /* Data on rising edge of bclk, frame high, 1clk before data */
446 xcr |= ESAI_xCR_xFSL | ESAI_xCR_xFSR;
447 xccr |= ESAI_xCCR_xCKP | ESAI_xCCR_xHCKP;
448 break;
449 case SND_SOC_DAIFMT_DSP_B:
450 /* Data on rising edge of bclk, frame high */
451 xcr |= ESAI_xCR_xFSL;
452 xccr |= ESAI_xCCR_xCKP | ESAI_xCCR_xHCKP;
453 break;
454 default:
455 return -EINVAL;
456 }
457
458 /* DAI clock inversion */
459 switch (fmt & SND_SOC_DAIFMT_INV_MASK) {
460 case SND_SOC_DAIFMT_NB_NF:
461 /* Nothing to do for both normal cases */
462 break;
463 case SND_SOC_DAIFMT_IB_NF:
464 /* Invert bit clock */
465 xccr ^= ESAI_xCCR_xCKP | ESAI_xCCR_xHCKP;
466 break;
467 case SND_SOC_DAIFMT_NB_IF:
468 /* Invert frame clock */
469 xccr ^= ESAI_xCCR_xFSP;
470 break;
471 case SND_SOC_DAIFMT_IB_IF:
472 /* Invert both clocks */
473 xccr ^= ESAI_xCCR_xCKP | ESAI_xCCR_xHCKP | ESAI_xCCR_xFSP;
474 break;
475 default:
476 return -EINVAL;
477 }
478
479 esai_priv->consumer_mode = false;
480
481 /* DAI clock provider masks */
482 switch (fmt & SND_SOC_DAIFMT_CLOCK_PROVIDER_MASK) {
483 case SND_SOC_DAIFMT_BC_FC:
484 esai_priv->consumer_mode = true;
485 break;
486 case SND_SOC_DAIFMT_BP_FC:
487 xccr |= ESAI_xCCR_xCKD;
488 break;
489 case SND_SOC_DAIFMT_BC_FP:
490 xccr |= ESAI_xCCR_xFSD;
491 break;
492 case SND_SOC_DAIFMT_BP_FP:
493 xccr |= ESAI_xCCR_xFSD | ESAI_xCCR_xCKD;
494 break;
495 default:
496 return -EINVAL;
497 }
498
499 mask = ESAI_xCR_xFSL | ESAI_xCR_xFSR | ESAI_xCR_xWA;
500 regmap_update_bits(map: esai_priv->regmap, REG_ESAI_TCR, mask, val: xcr);
501 regmap_update_bits(map: esai_priv->regmap, REG_ESAI_RCR, mask, val: xcr);
502
503 mask = ESAI_xCCR_xCKP | ESAI_xCCR_xHCKP | ESAI_xCCR_xFSP |
504 ESAI_xCCR_xFSD | ESAI_xCCR_xCKD;
505 regmap_update_bits(map: esai_priv->regmap, REG_ESAI_TCCR, mask, val: xccr);
506 regmap_update_bits(map: esai_priv->regmap, REG_ESAI_RCCR, mask, val: xccr);
507
508 return 0;
509}
510
511static int fsl_esai_startup(struct snd_pcm_substream *substream,
512 struct snd_soc_dai *dai)
513{
514 struct fsl_esai *esai_priv = snd_soc_dai_get_drvdata(dai);
515
516 if (!snd_soc_dai_active(dai)) {
517 /* Set synchronous mode */
518 regmap_update_bits(map: esai_priv->regmap, REG_ESAI_SAICR,
519 ESAI_SAICR_SYNC, val: esai_priv->synchronous ?
520 ESAI_SAICR_SYNC : 0);
521
522 /* Set slots count */
523 regmap_update_bits(map: esai_priv->regmap, REG_ESAI_TCCR,
524 ESAI_xCCR_xDC_MASK,
525 ESAI_xCCR_xDC(esai_priv->slots));
526 regmap_update_bits(map: esai_priv->regmap, REG_ESAI_RCCR,
527 ESAI_xCCR_xDC_MASK,
528 ESAI_xCCR_xDC(esai_priv->slots));
529 }
530
531 return 0;
532
533}
534
535static int fsl_esai_hw_params(struct snd_pcm_substream *substream,
536 struct snd_pcm_hw_params *params,
537 struct snd_soc_dai *dai)
538{
539 struct fsl_esai *esai_priv = snd_soc_dai_get_drvdata(dai);
540 bool tx = substream->stream == SNDRV_PCM_STREAM_PLAYBACK;
541 u32 width = params_width(p: params);
542 u32 channels = params_channels(p: params);
543 u32 pins = DIV_ROUND_UP(channels, esai_priv->slots);
544 u32 slot_width = width;
545 u32 bclk, mask, val;
546 int ret;
547
548 /* Override slot_width if being specifically set */
549 if (esai_priv->slot_width)
550 slot_width = esai_priv->slot_width;
551
552 bclk = params_rate(p: params) * slot_width * esai_priv->slots;
553
554 ret = fsl_esai_set_bclk(dai, tx: esai_priv->synchronous || tx, freq: bclk);
555 if (ret)
556 return ret;
557
558 mask = ESAI_xCR_xSWS_MASK;
559 val = ESAI_xCR_xSWS(slot_width, width);
560
561 regmap_update_bits(map: esai_priv->regmap, REG_ESAI_xCR(tx), mask, val);
562 /* Recording in synchronous mode needs to set TCR also */
563 if (!tx && esai_priv->synchronous)
564 regmap_update_bits(map: esai_priv->regmap, REG_ESAI_TCR, mask, val);
565
566 /* Use Normal mode to support monaural audio */
567 regmap_update_bits(map: esai_priv->regmap, REG_ESAI_xCR(tx),
568 ESAI_xCR_xMOD_MASK, val: params_channels(p: params) > 1 ?
569 ESAI_xCR_xMOD_NETWORK : 0);
570
571 regmap_update_bits(map: esai_priv->regmap, REG_ESAI_xFCR(tx),
572 ESAI_xFCR_xFR_MASK, ESAI_xFCR_xFR);
573
574 mask = ESAI_xFCR_xFR_MASK | ESAI_xFCR_xWA_MASK | ESAI_xFCR_xFWM_MASK |
575 (tx ? ESAI_xFCR_TE_MASK | ESAI_xFCR_TIEN : ESAI_xFCR_RE_MASK);
576 val = ESAI_xFCR_xWA(width) | ESAI_xFCR_xFWM(esai_priv->fifo_depth) |
577 (tx ? ESAI_xFCR_TE(pins) | ESAI_xFCR_TIEN : ESAI_xFCR_RE(pins));
578
579 regmap_update_bits(map: esai_priv->regmap, REG_ESAI_xFCR(tx), mask, val);
580
581 if (tx)
582 regmap_update_bits(map: esai_priv->regmap, REG_ESAI_TCR,
583 ESAI_xCR_PADC, ESAI_xCR_PADC);
584
585 /* Remove ESAI personal reset by configuring ESAI_PCRC and ESAI_PRRC */
586 regmap_update_bits(map: esai_priv->regmap, REG_ESAI_PRRC,
587 ESAI_PRRC_PDC_MASK, ESAI_PRRC_PDC(ESAI_GPIO));
588 regmap_update_bits(map: esai_priv->regmap, REG_ESAI_PCRC,
589 ESAI_PCRC_PC_MASK, ESAI_PCRC_PC(ESAI_GPIO));
590 return 0;
591}
592
593static int fsl_esai_hw_init(struct fsl_esai *esai_priv)
594{
595 struct platform_device *pdev = esai_priv->pdev;
596 int ret;
597
598 /* Reset ESAI unit */
599 ret = regmap_update_bits(map: esai_priv->regmap, REG_ESAI_ECR,
600 ESAI_ECR_ESAIEN_MASK | ESAI_ECR_ERST_MASK,
601 ESAI_ECR_ESAIEN | ESAI_ECR_ERST);
602 if (ret) {
603 dev_err(&pdev->dev, "failed to reset ESAI: %d\n", ret);
604 return ret;
605 }
606
607 /*
608 * We need to enable ESAI so as to access some of its registers.
609 * Otherwise, we would fail to dump regmap from user space.
610 */
611 ret = regmap_update_bits(map: esai_priv->regmap, REG_ESAI_ECR,
612 ESAI_ECR_ESAIEN_MASK | ESAI_ECR_ERST_MASK,
613 ESAI_ECR_ESAIEN);
614 if (ret) {
615 dev_err(&pdev->dev, "failed to enable ESAI: %d\n", ret);
616 return ret;
617 }
618
619 regmap_update_bits(map: esai_priv->regmap, REG_ESAI_PRRC,
620 ESAI_PRRC_PDC_MASK, val: 0);
621 regmap_update_bits(map: esai_priv->regmap, REG_ESAI_PCRC,
622 ESAI_PCRC_PC_MASK, val: 0);
623
624 return 0;
625}
626
627static int fsl_esai_register_restore(struct fsl_esai *esai_priv)
628{
629 int ret;
630
631 /* FIFO reset for safety */
632 regmap_update_bits(map: esai_priv->regmap, REG_ESAI_TFCR,
633 ESAI_xFCR_xFR, ESAI_xFCR_xFR);
634 regmap_update_bits(map: esai_priv->regmap, REG_ESAI_RFCR,
635 ESAI_xFCR_xFR, ESAI_xFCR_xFR);
636
637 regcache_mark_dirty(map: esai_priv->regmap);
638 ret = regcache_sync(map: esai_priv->regmap);
639 if (ret)
640 return ret;
641
642 /* FIFO reset done */
643 regmap_update_bits(map: esai_priv->regmap, REG_ESAI_TFCR, ESAI_xFCR_xFR, val: 0);
644 regmap_update_bits(map: esai_priv->regmap, REG_ESAI_RFCR, ESAI_xFCR_xFR, val: 0);
645
646 return 0;
647}
648
649static void fsl_esai_trigger_start(struct fsl_esai *esai_priv, bool tx)
650{
651 u8 i, channels = esai_priv->channels[tx];
652 u32 pins = DIV_ROUND_UP(channels, esai_priv->slots);
653 u32 mask;
654
655 regmap_update_bits(map: esai_priv->regmap, REG_ESAI_xFCR(tx),
656 ESAI_xFCR_xFEN_MASK, ESAI_xFCR_xFEN);
657
658 /* Write initial words reqiured by ESAI as normal procedure */
659 for (i = 0; tx && i < channels; i++)
660 regmap_write(map: esai_priv->regmap, REG_ESAI_ETDR, val: 0x0);
661
662 /*
663 * When set the TE/RE in the end of enablement flow, there
664 * will be channel swap issue for multi data line case.
665 * In order to workaround this issue, we switch the bit
666 * enablement sequence to below sequence
667 * 1) clear the xSMB & xSMA: which is done in probe and
668 * stop state.
669 * 2) set TE/RE
670 * 3) set xSMB
671 * 4) set xSMA: xSMA is the last one in this flow, which
672 * will trigger esai to start.
673 */
674 regmap_update_bits(map: esai_priv->regmap, REG_ESAI_xCR(tx),
675 mask: tx ? ESAI_xCR_TE_MASK : ESAI_xCR_RE_MASK,
676 val: tx ? ESAI_xCR_TE(pins) : ESAI_xCR_RE(pins));
677 mask = tx ? esai_priv->tx_mask : esai_priv->rx_mask;
678
679 regmap_update_bits(map: esai_priv->regmap, REG_ESAI_xSMB(tx),
680 ESAI_xSMB_xS_MASK, ESAI_xSMB_xS(mask));
681 regmap_update_bits(map: esai_priv->regmap, REG_ESAI_xSMA(tx),
682 ESAI_xSMA_xS_MASK, ESAI_xSMA_xS(mask));
683
684 /* Enable Exception interrupt */
685 regmap_update_bits(map: esai_priv->regmap, REG_ESAI_xCR(tx),
686 ESAI_xCR_xEIE_MASK, ESAI_xCR_xEIE);
687}
688
689static void fsl_esai_trigger_stop(struct fsl_esai *esai_priv, bool tx)
690{
691 regmap_update_bits(map: esai_priv->regmap, REG_ESAI_xCR(tx),
692 ESAI_xCR_xEIE_MASK, val: 0);
693
694 regmap_update_bits(map: esai_priv->regmap, REG_ESAI_xCR(tx),
695 mask: tx ? ESAI_xCR_TE_MASK : ESAI_xCR_RE_MASK, val: 0);
696 regmap_update_bits(map: esai_priv->regmap, REG_ESAI_xSMA(tx),
697 ESAI_xSMA_xS_MASK, val: 0);
698 regmap_update_bits(map: esai_priv->regmap, REG_ESAI_xSMB(tx),
699 ESAI_xSMB_xS_MASK, val: 0);
700
701 /* Disable and reset FIFO */
702 regmap_update_bits(map: esai_priv->regmap, REG_ESAI_xFCR(tx),
703 ESAI_xFCR_xFR | ESAI_xFCR_xFEN, ESAI_xFCR_xFR);
704 regmap_update_bits(map: esai_priv->regmap, REG_ESAI_xFCR(tx),
705 ESAI_xFCR_xFR, val: 0);
706}
707
708static void fsl_esai_hw_reset(struct work_struct *work)
709{
710 struct fsl_esai *esai_priv = container_of(work, struct fsl_esai, work);
711 bool tx = true, rx = false, enabled[2];
712 unsigned long lock_flags;
713 u32 tfcr, rfcr;
714
715 spin_lock_irqsave(&esai_priv->lock, lock_flags);
716 /* Save the registers */
717 regmap_read(map: esai_priv->regmap, REG_ESAI_TFCR, val: &tfcr);
718 regmap_read(map: esai_priv->regmap, REG_ESAI_RFCR, val: &rfcr);
719 enabled[tx] = tfcr & ESAI_xFCR_xFEN;
720 enabled[rx] = rfcr & ESAI_xFCR_xFEN;
721
722 /* Stop the tx & rx */
723 fsl_esai_trigger_stop(esai_priv, tx);
724 fsl_esai_trigger_stop(esai_priv, tx: rx);
725
726 /* Reset the esai, and ignore return value */
727 fsl_esai_hw_init(esai_priv);
728
729 /* Enforce ESAI personal resets for both TX and RX */
730 regmap_update_bits(map: esai_priv->regmap, REG_ESAI_TCR,
731 ESAI_xCR_xPR_MASK, ESAI_xCR_xPR);
732 regmap_update_bits(map: esai_priv->regmap, REG_ESAI_RCR,
733 ESAI_xCR_xPR_MASK, ESAI_xCR_xPR);
734
735 /* Restore registers by regcache_sync, and ignore return value */
736 fsl_esai_register_restore(esai_priv);
737
738 /* Remove ESAI personal resets by configuring PCRC and PRRC also */
739 regmap_update_bits(map: esai_priv->regmap, REG_ESAI_TCR,
740 ESAI_xCR_xPR_MASK, val: 0);
741 regmap_update_bits(map: esai_priv->regmap, REG_ESAI_RCR,
742 ESAI_xCR_xPR_MASK, val: 0);
743 regmap_update_bits(map: esai_priv->regmap, REG_ESAI_PRRC,
744 ESAI_PRRC_PDC_MASK, ESAI_PRRC_PDC(ESAI_GPIO));
745 regmap_update_bits(map: esai_priv->regmap, REG_ESAI_PCRC,
746 ESAI_PCRC_PC_MASK, ESAI_PCRC_PC(ESAI_GPIO));
747
748 /* Restart tx / rx, if they already enabled */
749 if (enabled[tx])
750 fsl_esai_trigger_start(esai_priv, tx);
751 if (enabled[rx])
752 fsl_esai_trigger_start(esai_priv, tx: rx);
753
754 spin_unlock_irqrestore(lock: &esai_priv->lock, flags: lock_flags);
755}
756
757static int fsl_esai_trigger(struct snd_pcm_substream *substream, int cmd,
758 struct snd_soc_dai *dai)
759{
760 struct fsl_esai *esai_priv = snd_soc_dai_get_drvdata(dai);
761 bool tx = substream->stream == SNDRV_PCM_STREAM_PLAYBACK;
762 unsigned long lock_flags;
763
764 esai_priv->channels[tx] = substream->runtime->channels;
765
766 switch (cmd) {
767 case SNDRV_PCM_TRIGGER_START:
768 case SNDRV_PCM_TRIGGER_RESUME:
769 case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
770 spin_lock_irqsave(&esai_priv->lock, lock_flags);
771 fsl_esai_trigger_start(esai_priv, tx);
772 spin_unlock_irqrestore(lock: &esai_priv->lock, flags: lock_flags);
773 break;
774 case SNDRV_PCM_TRIGGER_SUSPEND:
775 case SNDRV_PCM_TRIGGER_STOP:
776 case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
777 spin_lock_irqsave(&esai_priv->lock, lock_flags);
778 fsl_esai_trigger_stop(esai_priv, tx);
779 spin_unlock_irqrestore(lock: &esai_priv->lock, flags: lock_flags);
780 break;
781 default:
782 return -EINVAL;
783 }
784
785 return 0;
786}
787
788static int fsl_esai_dai_probe(struct snd_soc_dai *dai)
789{
790 struct fsl_esai *esai_priv = snd_soc_dai_get_drvdata(dai);
791
792 snd_soc_dai_init_dma_data(dai, playback: &esai_priv->dma_params_tx,
793 capture: &esai_priv->dma_params_rx);
794
795 return 0;
796}
797
798static const struct snd_soc_dai_ops fsl_esai_dai_ops = {
799 .probe = fsl_esai_dai_probe,
800 .startup = fsl_esai_startup,
801 .trigger = fsl_esai_trigger,
802 .hw_params = fsl_esai_hw_params,
803 .set_sysclk = fsl_esai_set_dai_sysclk,
804 .set_fmt = fsl_esai_set_dai_fmt,
805 .set_tdm_slot = fsl_esai_set_dai_tdm_slot,
806};
807
808static struct snd_soc_dai_driver fsl_esai_dai = {
809 .playback = {
810 .stream_name = "CPU-Playback",
811 .channels_min = 1,
812 .channels_max = 12,
813 .rates = SNDRV_PCM_RATE_8000_192000,
814 .formats = FSL_ESAI_FORMATS,
815 },
816 .capture = {
817 .stream_name = "CPU-Capture",
818 .channels_min = 1,
819 .channels_max = 8,
820 .rates = SNDRV_PCM_RATE_8000_192000,
821 .formats = FSL_ESAI_FORMATS,
822 },
823 .ops = &fsl_esai_dai_ops,
824};
825
826static const struct snd_soc_component_driver fsl_esai_component = {
827 .name = "fsl-esai",
828 .legacy_dai_naming = 1,
829};
830
831static const struct reg_default fsl_esai_reg_defaults[] = {
832 {REG_ESAI_ETDR, 0x00000000},
833 {REG_ESAI_ECR, 0x00000000},
834 {REG_ESAI_TFCR, 0x00000000},
835 {REG_ESAI_RFCR, 0x00000000},
836 {REG_ESAI_TX0, 0x00000000},
837 {REG_ESAI_TX1, 0x00000000},
838 {REG_ESAI_TX2, 0x00000000},
839 {REG_ESAI_TX3, 0x00000000},
840 {REG_ESAI_TX4, 0x00000000},
841 {REG_ESAI_TX5, 0x00000000},
842 {REG_ESAI_TSR, 0x00000000},
843 {REG_ESAI_SAICR, 0x00000000},
844 {REG_ESAI_TCR, 0x00000000},
845 {REG_ESAI_TCCR, 0x00000000},
846 {REG_ESAI_RCR, 0x00000000},
847 {REG_ESAI_RCCR, 0x00000000},
848 {REG_ESAI_TSMA, 0x0000ffff},
849 {REG_ESAI_TSMB, 0x0000ffff},
850 {REG_ESAI_RSMA, 0x0000ffff},
851 {REG_ESAI_RSMB, 0x0000ffff},
852 {REG_ESAI_PRRC, 0x00000000},
853 {REG_ESAI_PCRC, 0x00000000},
854};
855
856static bool fsl_esai_readable_reg(struct device *dev, unsigned int reg)
857{
858 switch (reg) {
859 case REG_ESAI_ERDR:
860 case REG_ESAI_ECR:
861 case REG_ESAI_ESR:
862 case REG_ESAI_TFCR:
863 case REG_ESAI_TFSR:
864 case REG_ESAI_RFCR:
865 case REG_ESAI_RFSR:
866 case REG_ESAI_RX0:
867 case REG_ESAI_RX1:
868 case REG_ESAI_RX2:
869 case REG_ESAI_RX3:
870 case REG_ESAI_SAISR:
871 case REG_ESAI_SAICR:
872 case REG_ESAI_TCR:
873 case REG_ESAI_TCCR:
874 case REG_ESAI_RCR:
875 case REG_ESAI_RCCR:
876 case REG_ESAI_TSMA:
877 case REG_ESAI_TSMB:
878 case REG_ESAI_RSMA:
879 case REG_ESAI_RSMB:
880 case REG_ESAI_PRRC:
881 case REG_ESAI_PCRC:
882 return true;
883 default:
884 return false;
885 }
886}
887
888static bool fsl_esai_volatile_reg(struct device *dev, unsigned int reg)
889{
890 switch (reg) {
891 case REG_ESAI_ERDR:
892 case REG_ESAI_ESR:
893 case REG_ESAI_TFSR:
894 case REG_ESAI_RFSR:
895 case REG_ESAI_RX0:
896 case REG_ESAI_RX1:
897 case REG_ESAI_RX2:
898 case REG_ESAI_RX3:
899 case REG_ESAI_SAISR:
900 return true;
901 default:
902 return false;
903 }
904}
905
906static bool fsl_esai_writeable_reg(struct device *dev, unsigned int reg)
907{
908 switch (reg) {
909 case REG_ESAI_ETDR:
910 case REG_ESAI_ECR:
911 case REG_ESAI_TFCR:
912 case REG_ESAI_RFCR:
913 case REG_ESAI_TX0:
914 case REG_ESAI_TX1:
915 case REG_ESAI_TX2:
916 case REG_ESAI_TX3:
917 case REG_ESAI_TX4:
918 case REG_ESAI_TX5:
919 case REG_ESAI_TSR:
920 case REG_ESAI_SAICR:
921 case REG_ESAI_TCR:
922 case REG_ESAI_TCCR:
923 case REG_ESAI_RCR:
924 case REG_ESAI_RCCR:
925 case REG_ESAI_TSMA:
926 case REG_ESAI_TSMB:
927 case REG_ESAI_RSMA:
928 case REG_ESAI_RSMB:
929 case REG_ESAI_PRRC:
930 case REG_ESAI_PCRC:
931 return true;
932 default:
933 return false;
934 }
935}
936
937static const struct regmap_config fsl_esai_regmap_config = {
938 .reg_bits = 32,
939 .reg_stride = 4,
940 .val_bits = 32,
941
942 .max_register = REG_ESAI_PCRC,
943 .reg_defaults = fsl_esai_reg_defaults,
944 .num_reg_defaults = ARRAY_SIZE(fsl_esai_reg_defaults),
945 .readable_reg = fsl_esai_readable_reg,
946 .volatile_reg = fsl_esai_volatile_reg,
947 .writeable_reg = fsl_esai_writeable_reg,
948 .cache_type = REGCACHE_FLAT,
949};
950
951static int fsl_esai_runtime_resume(struct device *dev);
952static int fsl_esai_runtime_suspend(struct device *dev);
953
954static int fsl_esai_probe(struct platform_device *pdev)
955{
956 struct device_node *np = pdev->dev.of_node;
957 struct fsl_esai *esai_priv;
958 struct resource *res;
959 const __be32 *iprop;
960 void __iomem *regs;
961 int irq, ret;
962
963 esai_priv = devm_kzalloc(dev: &pdev->dev, size: sizeof(*esai_priv), GFP_KERNEL);
964 if (!esai_priv)
965 return -ENOMEM;
966
967 esai_priv->pdev = pdev;
968 snprintf(buf: esai_priv->name, size: sizeof(esai_priv->name), fmt: "%pOFn", np);
969
970 esai_priv->soc = of_device_get_match_data(dev: &pdev->dev);
971
972 /* Get the addresses and IRQ */
973 regs = devm_platform_get_and_ioremap_resource(pdev, index: 0, res: &res);
974 if (IS_ERR(ptr: regs))
975 return PTR_ERR(ptr: regs);
976
977 esai_priv->regmap = devm_regmap_init_mmio(&pdev->dev, regs, &fsl_esai_regmap_config);
978 if (IS_ERR(ptr: esai_priv->regmap)) {
979 dev_err(&pdev->dev, "failed to init regmap: %ld\n",
980 PTR_ERR(esai_priv->regmap));
981 return PTR_ERR(ptr: esai_priv->regmap);
982 }
983
984 esai_priv->coreclk = devm_clk_get(dev: &pdev->dev, id: "core");
985 if (IS_ERR(ptr: esai_priv->coreclk)) {
986 dev_err(&pdev->dev, "failed to get core clock: %ld\n",
987 PTR_ERR(esai_priv->coreclk));
988 return PTR_ERR(ptr: esai_priv->coreclk);
989 }
990
991 esai_priv->extalclk = devm_clk_get(dev: &pdev->dev, id: "extal");
992 if (IS_ERR(ptr: esai_priv->extalclk))
993 dev_warn(&pdev->dev, "failed to get extal clock: %ld\n",
994 PTR_ERR(esai_priv->extalclk));
995
996 esai_priv->fsysclk = devm_clk_get(dev: &pdev->dev, id: "fsys");
997 if (IS_ERR(ptr: esai_priv->fsysclk))
998 dev_warn(&pdev->dev, "failed to get fsys clock: %ld\n",
999 PTR_ERR(esai_priv->fsysclk));
1000
1001 esai_priv->spbaclk = devm_clk_get(dev: &pdev->dev, id: "spba");
1002 if (IS_ERR(ptr: esai_priv->spbaclk))
1003 dev_warn(&pdev->dev, "failed to get spba clock: %ld\n",
1004 PTR_ERR(esai_priv->spbaclk));
1005
1006 irq = platform_get_irq(pdev, 0);
1007 if (irq < 0)
1008 return irq;
1009
1010 ret = devm_request_irq(dev: &pdev->dev, irq, handler: esai_isr, IRQF_SHARED,
1011 devname: esai_priv->name, dev_id: esai_priv);
1012 if (ret) {
1013 dev_err(&pdev->dev, "failed to claim irq %u\n", irq);
1014 return ret;
1015 }
1016
1017 /* Set a default slot number */
1018 esai_priv->slots = 2;
1019
1020 /* Set a default clock provider state */
1021 esai_priv->consumer_mode = true;
1022
1023 /* Determine the FIFO depth */
1024 iprop = of_get_property(node: np, name: "fsl,fifo-depth", NULL);
1025 if (iprop)
1026 esai_priv->fifo_depth = be32_to_cpup(p: iprop);
1027 else
1028 esai_priv->fifo_depth = 64;
1029
1030 esai_priv->dma_params_tx.maxburst = 16;
1031 esai_priv->dma_params_rx.maxburst = 16;
1032 esai_priv->dma_params_tx.addr = res->start + REG_ESAI_ETDR;
1033 esai_priv->dma_params_rx.addr = res->start + REG_ESAI_ERDR;
1034
1035 esai_priv->synchronous =
1036 of_property_read_bool(np, propname: "fsl,esai-synchronous");
1037
1038 /* Implement full symmetry for synchronous mode */
1039 if (esai_priv->synchronous) {
1040 fsl_esai_dai.symmetric_rate = 1;
1041 fsl_esai_dai.symmetric_channels = 1;
1042 fsl_esai_dai.symmetric_sample_bits = 1;
1043 }
1044
1045 dev_set_drvdata(dev: &pdev->dev, data: esai_priv);
1046 spin_lock_init(&esai_priv->lock);
1047 pm_runtime_enable(dev: &pdev->dev);
1048 if (!pm_runtime_enabled(dev: &pdev->dev)) {
1049 ret = fsl_esai_runtime_resume(dev: &pdev->dev);
1050 if (ret)
1051 goto err_pm_disable;
1052 }
1053
1054 ret = pm_runtime_resume_and_get(dev: &pdev->dev);
1055 if (ret < 0)
1056 goto err_pm_get_sync;
1057
1058 ret = fsl_esai_hw_init(esai_priv);
1059 if (ret)
1060 goto err_pm_get_sync;
1061
1062 esai_priv->tx_mask = 0xFFFFFFFF;
1063 esai_priv->rx_mask = 0xFFFFFFFF;
1064
1065 /* Clear the TSMA, TSMB, RSMA, RSMB */
1066 regmap_write(map: esai_priv->regmap, REG_ESAI_TSMA, val: 0);
1067 regmap_write(map: esai_priv->regmap, REG_ESAI_TSMB, val: 0);
1068 regmap_write(map: esai_priv->regmap, REG_ESAI_RSMA, val: 0);
1069 regmap_write(map: esai_priv->regmap, REG_ESAI_RSMB, val: 0);
1070
1071 ret = pm_runtime_put_sync(dev: &pdev->dev);
1072 if (ret < 0 && ret != -ENOSYS)
1073 goto err_pm_get_sync;
1074
1075 /*
1076 * Register platform component before registering cpu dai for there
1077 * is not defer probe for platform component in snd_soc_add_pcm_runtime().
1078 */
1079 ret = imx_pcm_dma_init(pdev);
1080 if (ret) {
1081 dev_err(&pdev->dev, "failed to init imx pcm dma: %d\n", ret);
1082 goto err_pm_get_sync;
1083 }
1084
1085 ret = devm_snd_soc_register_component(dev: &pdev->dev, component_driver: &fsl_esai_component,
1086 dai_drv: &fsl_esai_dai, num_dai: 1);
1087 if (ret) {
1088 dev_err(&pdev->dev, "failed to register DAI: %d\n", ret);
1089 goto err_pm_get_sync;
1090 }
1091
1092 INIT_WORK(&esai_priv->work, fsl_esai_hw_reset);
1093
1094 return ret;
1095
1096err_pm_get_sync:
1097 if (!pm_runtime_status_suspended(dev: &pdev->dev))
1098 fsl_esai_runtime_suspend(dev: &pdev->dev);
1099err_pm_disable:
1100 pm_runtime_disable(dev: &pdev->dev);
1101 return ret;
1102}
1103
1104static void fsl_esai_remove(struct platform_device *pdev)
1105{
1106 struct fsl_esai *esai_priv = platform_get_drvdata(pdev);
1107
1108 pm_runtime_disable(dev: &pdev->dev);
1109 if (!pm_runtime_status_suspended(dev: &pdev->dev))
1110 fsl_esai_runtime_suspend(dev: &pdev->dev);
1111
1112 cancel_work_sync(work: &esai_priv->work);
1113}
1114
1115static const struct of_device_id fsl_esai_dt_ids[] = {
1116 { .compatible = "fsl,imx35-esai", .data = &fsl_esai_imx35 },
1117 { .compatible = "fsl,vf610-esai", .data = &fsl_esai_vf610 },
1118 { .compatible = "fsl,imx6ull-esai", .data = &fsl_esai_imx6ull },
1119 {}
1120};
1121MODULE_DEVICE_TABLE(of, fsl_esai_dt_ids);
1122
1123static int fsl_esai_runtime_resume(struct device *dev)
1124{
1125 struct fsl_esai *esai = dev_get_drvdata(dev);
1126 int ret;
1127
1128 /*
1129 * Some platforms might use the same bit to gate all three or two of
1130 * clocks, so keep all clocks open/close at the same time for safety
1131 */
1132 ret = clk_prepare_enable(clk: esai->coreclk);
1133 if (ret)
1134 return ret;
1135 if (!IS_ERR(ptr: esai->spbaclk)) {
1136 ret = clk_prepare_enable(clk: esai->spbaclk);
1137 if (ret)
1138 goto err_spbaclk;
1139 }
1140 if (!IS_ERR(ptr: esai->extalclk)) {
1141 ret = clk_prepare_enable(clk: esai->extalclk);
1142 if (ret)
1143 goto err_extalclk;
1144 }
1145 if (!IS_ERR(ptr: esai->fsysclk)) {
1146 ret = clk_prepare_enable(clk: esai->fsysclk);
1147 if (ret)
1148 goto err_fsysclk;
1149 }
1150
1151 regcache_cache_only(map: esai->regmap, enable: false);
1152
1153 ret = fsl_esai_register_restore(esai_priv: esai);
1154 if (ret)
1155 goto err_regcache_sync;
1156
1157 return 0;
1158
1159err_regcache_sync:
1160 if (!IS_ERR(ptr: esai->fsysclk))
1161 clk_disable_unprepare(clk: esai->fsysclk);
1162err_fsysclk:
1163 if (!IS_ERR(ptr: esai->extalclk))
1164 clk_disable_unprepare(clk: esai->extalclk);
1165err_extalclk:
1166 if (!IS_ERR(ptr: esai->spbaclk))
1167 clk_disable_unprepare(clk: esai->spbaclk);
1168err_spbaclk:
1169 clk_disable_unprepare(clk: esai->coreclk);
1170
1171 return ret;
1172}
1173
1174static int fsl_esai_runtime_suspend(struct device *dev)
1175{
1176 struct fsl_esai *esai = dev_get_drvdata(dev);
1177
1178 regcache_cache_only(map: esai->regmap, enable: true);
1179
1180 if (!IS_ERR(ptr: esai->fsysclk))
1181 clk_disable_unprepare(clk: esai->fsysclk);
1182 if (!IS_ERR(ptr: esai->extalclk))
1183 clk_disable_unprepare(clk: esai->extalclk);
1184 if (!IS_ERR(ptr: esai->spbaclk))
1185 clk_disable_unprepare(clk: esai->spbaclk);
1186 clk_disable_unprepare(clk: esai->coreclk);
1187
1188 return 0;
1189}
1190
1191static const struct dev_pm_ops fsl_esai_pm_ops = {
1192 RUNTIME_PM_OPS(fsl_esai_runtime_suspend, fsl_esai_runtime_resume, NULL)
1193 SYSTEM_SLEEP_PM_OPS(pm_runtime_force_suspend, pm_runtime_force_resume)
1194};
1195
1196static struct platform_driver fsl_esai_driver = {
1197 .probe = fsl_esai_probe,
1198 .remove = fsl_esai_remove,
1199 .driver = {
1200 .name = "fsl-esai-dai",
1201 .pm = pm_ptr(&fsl_esai_pm_ops),
1202 .of_match_table = fsl_esai_dt_ids,
1203 },
1204};
1205
1206module_platform_driver(fsl_esai_driver);
1207
1208MODULE_AUTHOR("Freescale Semiconductor, Inc.");
1209MODULE_DESCRIPTION("Freescale ESAI CPU DAI driver");
1210MODULE_LICENSE("GPL v2");
1211MODULE_ALIAS("platform:fsl-esai-dai");
1212

source code of linux/sound/soc/fsl/fsl_esai.c