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Merge branch 'linus' of git://git.kernel.org/pub/scm/linux/kernel/git/herbert/crypto-2.6
[linux/fpc-iii.git] / sound / soc / fsl / fsl_esai.c
blob38bfd46f4ad8c3898d376d94d9f5bd010e285139
1 /*
2 * Freescale ESAI ALSA SoC Digital Audio Interface (DAI) driver
3 *
4 * Copyright (C) 2014 Freescale Semiconductor, Inc.
5 *
6 * This file is licensed under the terms of the GNU General Public License
7 * version 2. This program is licensed "as is" without any warranty of any
8 * kind, whether express or implied.
9 */
10
11 #include <linux/clk.h>
12 #include <linux/dmaengine.h>
13 #include <linux/module.h>
14 #include <linux/of_irq.h>
15 #include <linux/of_platform.h>
16 #include <sound/dmaengine_pcm.h>
17 #include <sound/pcm_params.h>
18
19 #include "fsl_esai.h"
20 #include "imx-pcm.h"
21
22 #define FSL_ESAI_RATES SNDRV_PCM_RATE_8000_192000
23 #define FSL_ESAI_FORMATS (SNDRV_PCM_FMTBIT_S8 | \
24 SNDRV_PCM_FMTBIT_S16_LE | \
25 SNDRV_PCM_FMTBIT_S20_3LE | \
26 SNDRV_PCM_FMTBIT_S24_LE)
27
28 /**
29 * fsl_esai: ESAI private data
30 *
31 * @dma_params_rx: DMA parameters for receive channel
32 * @dma_params_tx: DMA parameters for transmit channel
33 * @pdev: platform device pointer
34 * @regmap: regmap handler
35 * @coreclk: clock source to access register
36 * @extalclk: esai clock source to derive HCK, SCK and FS
37 * @fsysclk: system clock source to derive HCK, SCK and FS
38 * @spbaclk: SPBA clock (optional, depending on SoC design)
39 * @fifo_depth: depth of tx/rx FIFO
40 * @slot_width: width of each DAI slot
41 * @slots: number of slots
42 * @hck_rate: clock rate of desired HCKx clock
43 * @sck_rate: clock rate of desired SCKx clock
44 * @hck_dir: the direction of HCKx pads
45 * @sck_div: if using PSR/PM dividers for SCKx clock
46 * @slave_mode: if fully using DAI slave mode
47 * @synchronous: if using tx/rx synchronous mode
48 * @name: driver name
49 */
50 struct fsl_esai {
51 struct snd_dmaengine_dai_dma_data dma_params_rx;
52 struct snd_dmaengine_dai_dma_data dma_params_tx;
53 struct platform_device *pdev;
54 struct regmap *regmap;
55 struct clk *coreclk;
56 struct clk *extalclk;
57 struct clk *fsysclk;
58 struct clk *spbaclk;
59 u32 fifo_depth;
60 u32 slot_width;
61 u32 slots;
62 u32 hck_rate[2];
63 u32 sck_rate[2];
64 bool hck_dir[2];
65 bool sck_div[2];
66 bool slave_mode;
67 bool synchronous;
68 char name[32];
69 };
70
71 static irqreturn_t esai_isr(int irq, void *devid)
72 {
73 struct fsl_esai *esai_priv = (struct fsl_esai *)devid;
74 struct platform_device *pdev = esai_priv->pdev;
75 u32 esr;
76
77 regmap_read(esai_priv->regmap, REG_ESAI_ESR, &esr);
78
79 if (esr & ESAI_ESR_TINIT_MASK)
80 dev_dbg(&pdev->dev, "isr: Transmission Initialized\n");
81
82 if (esr & ESAI_ESR_RFF_MASK)
83 dev_warn(&pdev->dev, "isr: Receiving overrun\n");
84
85 if (esr & ESAI_ESR_TFE_MASK)
86 dev_warn(&pdev->dev, "isr: Transmission underrun\n");
87
88 if (esr & ESAI_ESR_TLS_MASK)
89 dev_dbg(&pdev->dev, "isr: Just transmitted the last slot\n");
90
91 if (esr & ESAI_ESR_TDE_MASK)
92 dev_dbg(&pdev->dev, "isr: Transmission data exception\n");
93
94 if (esr & ESAI_ESR_TED_MASK)
95 dev_dbg(&pdev->dev, "isr: Transmitting even slots\n");
96
97 if (esr & ESAI_ESR_TD_MASK)
98 dev_dbg(&pdev->dev, "isr: Transmitting data\n");
99
100 if (esr & ESAI_ESR_RLS_MASK)
101 dev_dbg(&pdev->dev, "isr: Just received the last slot\n");
102
103 if (esr & ESAI_ESR_RDE_MASK)
104 dev_dbg(&pdev->dev, "isr: Receiving data exception\n");
105
106 if (esr & ESAI_ESR_RED_MASK)
107 dev_dbg(&pdev->dev, "isr: Receiving even slots\n");
108
109 if (esr & ESAI_ESR_RD_MASK)
110 dev_dbg(&pdev->dev, "isr: Receiving data\n");
111
112 return IRQ_HANDLED;
113 }
114
115 /**
116 * This function is used to calculate the divisors of psr, pm, fp and it is
117 * supposed to be called in set_dai_sysclk() and set_bclk().
118 *
119 * @ratio: desired overall ratio for the paticipating dividers
120 * @usefp: for HCK setting, there is no need to set fp divider
121 * @fp: bypass other dividers by setting fp directly if fp != 0
122 * @tx: current setting is for playback or capture
123 */
124 static int fsl_esai_divisor_cal(struct snd_soc_dai *dai, bool tx, u32 ratio,
125 bool usefp, u32 fp)
126 {
127 struct fsl_esai *esai_priv = snd_soc_dai_get_drvdata(dai);
128 u32 psr, pm = 999, maxfp, prod, sub, savesub, i, j;
129
130 maxfp = usefp ? 16 : 1;
131
132 if (usefp && fp)
133 goto out_fp;
134
135 if (ratio > 2 * 8 * 256 * maxfp || ratio < 2) {
136 dev_err(dai->dev, "the ratio is out of range (2 ~ %d)\n",
137 2 * 8 * 256 * maxfp);
138 return -EINVAL;
139 } else if (ratio % 2) {
140 dev_err(dai->dev, "the raio must be even if using upper divider\n");
141 return -EINVAL;
142 }
143
144 ratio /= 2;
145
146 psr = ratio <= 256 * maxfp ? ESAI_xCCR_xPSR_BYPASS : ESAI_xCCR_xPSR_DIV8;
147
148 /* Set the max fluctuation -- 0.1% of the max devisor */
149 savesub = (psr ? 1 : 8) * 256 * maxfp / 1000;
150
151 /* Find the best value for PM */
152 for (i = 1; i <= 256; i++) {
153 for (j = 1; j <= maxfp; j++) {
154 /* PSR (1 or 8) * PM (1 ~ 256) * FP (1 ~ 16) */
155 prod = (psr ? 1 : 8) * i * j;
156
157 if (prod == ratio)
158 sub = 0;
159 else if (prod / ratio == 1)
160 sub = prod - ratio;
161 else if (ratio / prod == 1)
162 sub = ratio - prod;
163 else
164 continue;
165
166 /* Calculate the fraction */
167 sub = sub * 1000 / ratio;
168 if (sub < savesub) {
169 savesub = sub;
170 pm = i;
171 fp = j;
172 }
173
174 /* We are lucky */
175 if (savesub == 0)
176 goto out;
177 }
178 }
179
180 if (pm == 999) {
181 dev_err(dai->dev, "failed to calculate proper divisors\n");
182 return -EINVAL;
183 }
184
185 out:
186 regmap_update_bits(esai_priv->regmap, REG_ESAI_xCCR(tx),
187 ESAI_xCCR_xPSR_MASK | ESAI_xCCR_xPM_MASK,
188 psr | ESAI_xCCR_xPM(pm));
189
190 out_fp:
191 /* Bypass fp if not being required */
192 if (maxfp <= 1)
193 return 0;
194
195 regmap_update_bits(esai_priv->regmap, REG_ESAI_xCCR(tx),
196 ESAI_xCCR_xFP_MASK, ESAI_xCCR_xFP(fp));
197
198 return 0;
199 }
200
201 /**
202 * This function mainly configures the clock frequency of MCLK (HCKT/HCKR)
203 *
204 * @Parameters:
205 * clk_id: The clock source of HCKT/HCKR
206 * (Input from outside; output from inside, FSYS or EXTAL)
207 * freq: The required clock rate of HCKT/HCKR
208 * dir: The clock direction of HCKT/HCKR
209 *
210 * Note: If the direction is input, we do not care about clk_id.
211 */
212 static int fsl_esai_set_dai_sysclk(struct snd_soc_dai *dai, int clk_id,
213 unsigned int freq, int dir)
214 {
215 struct fsl_esai *esai_priv = snd_soc_dai_get_drvdata(dai);
216 struct clk *clksrc = esai_priv->extalclk;
217 bool tx = clk_id <= ESAI_HCKT_EXTAL;
218 bool in = dir == SND_SOC_CLOCK_IN;
219 u32 ratio, ecr = 0;
220 unsigned long clk_rate;
221 int ret;
222
223 /* Bypass divider settings if the requirement doesn't change */
224 if (freq == esai_priv->hck_rate[tx] && dir == esai_priv->hck_dir[tx])
225 return 0;
226
227 /* sck_div can be only bypassed if ETO/ERO=0 and SNC_SOC_CLOCK_OUT */
228 esai_priv->sck_div[tx] = true;
229
230 /* Set the direction of HCKT/HCKR pins */
231 regmap_update_bits(esai_priv->regmap, REG_ESAI_xCCR(tx),
232 ESAI_xCCR_xHCKD, in ? 0 : ESAI_xCCR_xHCKD);
233
234 if (in)
235 goto out;
236
237 switch (clk_id) {
238 case ESAI_HCKT_FSYS:
239 case ESAI_HCKR_FSYS:
240 clksrc = esai_priv->fsysclk;
241 break;
242 case ESAI_HCKT_EXTAL:
243 ecr |= ESAI_ECR_ETI;
244 case ESAI_HCKR_EXTAL:
245 ecr |= ESAI_ECR_ERI;
246 break;
247 default:
248 return -EINVAL;
249 }
250
251 if (IS_ERR(clksrc)) {
252 dev_err(dai->dev, "no assigned %s clock\n",
253 clk_id % 2 ? "extal" : "fsys");
254 return PTR_ERR(clksrc);
255 }
256 clk_rate = clk_get_rate(clksrc);
257
258 ratio = clk_rate / freq;
259 if (ratio * freq > clk_rate)
260 ret = ratio * freq - clk_rate;
261 else if (ratio * freq < clk_rate)
262 ret = clk_rate - ratio * freq;
263 else
264 ret = 0;
265
266 /* Block if clock source can not be divided into the required rate */
267 if (ret != 0 && clk_rate / ret < 1000) {
268 dev_err(dai->dev, "failed to derive required HCK%c rate\n",
269 tx ? 'T' : 'R');
270 return -EINVAL;
271 }
272
273 /* Only EXTAL source can be output directly without using PSR and PM */
274 if (ratio == 1 && clksrc == esai_priv->extalclk) {
275 /* Bypass all the dividers if not being needed */
276 ecr |= tx ? ESAI_ECR_ETO : ESAI_ECR_ERO;
277 goto out;
278 } else if (ratio < 2) {
279 /* The ratio should be no less than 2 if using other sources */
280 dev_err(dai->dev, "failed to derive required HCK%c rate\n",
281 tx ? 'T' : 'R');
282 return -EINVAL;
283 }
284
285 ret = fsl_esai_divisor_cal(dai, tx, ratio, false, 0);
286 if (ret)
287 return ret;
288
289 esai_priv->sck_div[tx] = false;
290
291 out:
292 esai_priv->hck_dir[tx] = dir;
293 esai_priv->hck_rate[tx] = freq;
294
295 regmap_update_bits(esai_priv->regmap, REG_ESAI_ECR,
296 tx ? ESAI_ECR_ETI | ESAI_ECR_ETO :
297 ESAI_ECR_ERI | ESAI_ECR_ERO, ecr);
298
299 return 0;
300 }
301
302 /**
303 * This function configures the related dividers according to the bclk rate
304 */
305 static int fsl_esai_set_bclk(struct snd_soc_dai *dai, bool tx, u32 freq)
306 {
307 struct fsl_esai *esai_priv = snd_soc_dai_get_drvdata(dai);
308 u32 hck_rate = esai_priv->hck_rate[tx];
309 u32 sub, ratio = hck_rate / freq;
310 int ret;
311
312 /* Don't apply for fully slave mode or unchanged bclk */
313 if (esai_priv->slave_mode || esai_priv->sck_rate[tx] == freq)
314 return 0;
315
316 if (ratio * freq > hck_rate)
317 sub = ratio * freq - hck_rate;
318 else if (ratio * freq < hck_rate)
319 sub = hck_rate - ratio * freq;
320 else
321 sub = 0;
322
323 /* Block if clock source can not be divided into the required rate */
324 if (sub != 0 && hck_rate / sub < 1000) {
325 dev_err(dai->dev, "failed to derive required SCK%c rate\n",
326 tx ? 'T' : 'R');
327 return -EINVAL;
328 }
329
330 /* The ratio should be contented by FP alone if bypassing PM and PSR */
331 if (!esai_priv->sck_div[tx] && (ratio > 16 || ratio == 0)) {
332 dev_err(dai->dev, "the ratio is out of range (1 ~ 16)\n");
333 return -EINVAL;
334 }
335
336 ret = fsl_esai_divisor_cal(dai, tx, ratio, true,
337 esai_priv->sck_div[tx] ? 0 : ratio);
338 if (ret)
339 return ret;
340
341 /* Save current bclk rate */
342 esai_priv->sck_rate[tx] = freq;
343
344 return 0;
345 }
346
347 static int fsl_esai_set_dai_tdm_slot(struct snd_soc_dai *dai, u32 tx_mask,
348 u32 rx_mask, int slots, int slot_width)
349 {
350 struct fsl_esai *esai_priv = snd_soc_dai_get_drvdata(dai);
351
352 regmap_update_bits(esai_priv->regmap, REG_ESAI_TCCR,
353 ESAI_xCCR_xDC_MASK, ESAI_xCCR_xDC(slots));
354
355 regmap_update_bits(esai_priv->regmap, REG_ESAI_TSMA,
356 ESAI_xSMA_xS_MASK, ESAI_xSMA_xS(tx_mask));
357 regmap_update_bits(esai_priv->regmap, REG_ESAI_TSMB,
358 ESAI_xSMB_xS_MASK, ESAI_xSMB_xS(tx_mask));
359
360 regmap_update_bits(esai_priv->regmap, REG_ESAI_RCCR,
361 ESAI_xCCR_xDC_MASK, ESAI_xCCR_xDC(slots));
362
363 regmap_update_bits(esai_priv->regmap, REG_ESAI_RSMA,
364 ESAI_xSMA_xS_MASK, ESAI_xSMA_xS(rx_mask));
365 regmap_update_bits(esai_priv->regmap, REG_ESAI_RSMB,
366 ESAI_xSMB_xS_MASK, ESAI_xSMB_xS(rx_mask));
367
368 esai_priv->slot_width = slot_width;
369 esai_priv->slots = slots;
370
371 return 0;
372 }
373
374 static int fsl_esai_set_dai_fmt(struct snd_soc_dai *dai, unsigned int fmt)
375 {
376 struct fsl_esai *esai_priv = snd_soc_dai_get_drvdata(dai);
377 u32 xcr = 0, xccr = 0, mask;
378
379 /* DAI mode */
380 switch (fmt & SND_SOC_DAIFMT_FORMAT_MASK) {
381 case SND_SOC_DAIFMT_I2S:
382 /* Data on rising edge of bclk, frame low, 1clk before data */
383 xcr |= ESAI_xCR_xFSR;
384 xccr |= ESAI_xCCR_xFSP | ESAI_xCCR_xCKP | ESAI_xCCR_xHCKP;
385 break;
386 case SND_SOC_DAIFMT_LEFT_J:
387 /* Data on rising edge of bclk, frame high */
388 xccr |= ESAI_xCCR_xCKP | ESAI_xCCR_xHCKP;
389 break;
390 case SND_SOC_DAIFMT_RIGHT_J:
391 /* Data on rising edge of bclk, frame high, right aligned */
392 xccr |= ESAI_xCCR_xCKP | ESAI_xCCR_xHCKP | ESAI_xCR_xWA;
393 break;
394 case SND_SOC_DAIFMT_DSP_A:
395 /* Data on rising edge of bclk, frame high, 1clk before data */
396 xcr |= ESAI_xCR_xFSL | ESAI_xCR_xFSR;
397 xccr |= ESAI_xCCR_xCKP | ESAI_xCCR_xHCKP;
398 break;
399 case SND_SOC_DAIFMT_DSP_B:
400 /* Data on rising edge of bclk, frame high */
401 xcr |= ESAI_xCR_xFSL;
402 xccr |= ESAI_xCCR_xCKP | ESAI_xCCR_xHCKP;
403 break;
404 default:
405 return -EINVAL;
406 }
407
408 /* DAI clock inversion */
409 switch (fmt & SND_SOC_DAIFMT_INV_MASK) {
410 case SND_SOC_DAIFMT_NB_NF:
411 /* Nothing to do for both normal cases */
412 break;
413 case SND_SOC_DAIFMT_IB_NF:
414 /* Invert bit clock */
415 xccr ^= ESAI_xCCR_xCKP | ESAI_xCCR_xHCKP;
416 break;
417 case SND_SOC_DAIFMT_NB_IF:
418 /* Invert frame clock */
419 xccr ^= ESAI_xCCR_xFSP;
420 break;
421 case SND_SOC_DAIFMT_IB_IF:
422 /* Invert both clocks */
423 xccr ^= ESAI_xCCR_xCKP | ESAI_xCCR_xHCKP | ESAI_xCCR_xFSP;
424 break;
425 default:
426 return -EINVAL;
427 }
428
429 esai_priv->slave_mode = false;
430
431 /* DAI clock master masks */
432 switch (fmt & SND_SOC_DAIFMT_MASTER_MASK) {
433 case SND_SOC_DAIFMT_CBM_CFM:
434 esai_priv->slave_mode = true;
435 break;
436 case SND_SOC_DAIFMT_CBS_CFM:
437 xccr |= ESAI_xCCR_xCKD;
438 break;
439 case SND_SOC_DAIFMT_CBM_CFS:
440 xccr |= ESAI_xCCR_xFSD;
441 break;
442 case SND_SOC_DAIFMT_CBS_CFS:
443 xccr |= ESAI_xCCR_xFSD | ESAI_xCCR_xCKD;
444 break;
445 default:
446 return -EINVAL;
447 }
448
449 mask = ESAI_xCR_xFSL | ESAI_xCR_xFSR;
450 regmap_update_bits(esai_priv->regmap, REG_ESAI_TCR, mask, xcr);
451 regmap_update_bits(esai_priv->regmap, REG_ESAI_RCR, mask, xcr);
452
453 mask = ESAI_xCCR_xCKP | ESAI_xCCR_xHCKP | ESAI_xCCR_xFSP |
454 ESAI_xCCR_xFSD | ESAI_xCCR_xCKD | ESAI_xCR_xWA;
455 regmap_update_bits(esai_priv->regmap, REG_ESAI_TCCR, mask, xccr);
456 regmap_update_bits(esai_priv->regmap, REG_ESAI_RCCR, mask, xccr);
457
458 return 0;
459 }
460
461 static int fsl_esai_startup(struct snd_pcm_substream *substream,
462 struct snd_soc_dai *dai)
463 {
464 struct fsl_esai *esai_priv = snd_soc_dai_get_drvdata(dai);
465 int ret;
466
467 /*
468 * Some platforms might use the same bit to gate all three or two of
469 * clocks, so keep all clocks open/close at the same time for safety
470 */
471 ret = clk_prepare_enable(esai_priv->coreclk);
472 if (ret)
473 return ret;
474 if (!IS_ERR(esai_priv->spbaclk)) {
475 ret = clk_prepare_enable(esai_priv->spbaclk);
476 if (ret)
477 goto err_spbaclk;
478 }
479 if (!IS_ERR(esai_priv->extalclk)) {
480 ret = clk_prepare_enable(esai_priv->extalclk);
481 if (ret)
482 goto err_extalck;
483 }
484 if (!IS_ERR(esai_priv->fsysclk)) {
485 ret = clk_prepare_enable(esai_priv->fsysclk);
486 if (ret)
487 goto err_fsysclk;
488 }
489
490 if (!dai->active) {
491 /* Set synchronous mode */
492 regmap_update_bits(esai_priv->regmap, REG_ESAI_SAICR,
493 ESAI_SAICR_SYNC, esai_priv->synchronous ?
494 ESAI_SAICR_SYNC : 0);
495
496 /* Set a default slot number -- 2 */
497 regmap_update_bits(esai_priv->regmap, REG_ESAI_TCCR,
498 ESAI_xCCR_xDC_MASK, ESAI_xCCR_xDC(2));
499 regmap_update_bits(esai_priv->regmap, REG_ESAI_RCCR,
500 ESAI_xCCR_xDC_MASK, ESAI_xCCR_xDC(2));
501 }
502
503 return 0;
504
505 err_fsysclk:
506 if (!IS_ERR(esai_priv->extalclk))
507 clk_disable_unprepare(esai_priv->extalclk);
508 err_extalck:
509 if (!IS_ERR(esai_priv->spbaclk))
510 clk_disable_unprepare(esai_priv->spbaclk);
511 err_spbaclk:
512 clk_disable_unprepare(esai_priv->coreclk);
513
514 return ret;
515 }
516
517 static int fsl_esai_hw_params(struct snd_pcm_substream *substream,
518 struct snd_pcm_hw_params *params,
519 struct snd_soc_dai *dai)
520 {
521 struct fsl_esai *esai_priv = snd_soc_dai_get_drvdata(dai);
522 bool tx = substream->stream == SNDRV_PCM_STREAM_PLAYBACK;
523 u32 width = params_width(params);
524 u32 channels = params_channels(params);
525 u32 pins = DIV_ROUND_UP(channels, esai_priv->slots);
526 u32 slot_width = width;
527 u32 bclk, mask, val;
528 int ret;
529
530 /* Override slot_width if being specifically set */
531 if (esai_priv->slot_width)
532 slot_width = esai_priv->slot_width;
533
534 bclk = params_rate(params) * slot_width * esai_priv->slots;
535
536 ret = fsl_esai_set_bclk(dai, tx, bclk);
537 if (ret)
538 return ret;
539
540 /* Use Normal mode to support monaural audio */
541 regmap_update_bits(esai_priv->regmap, REG_ESAI_xCR(tx),
542 ESAI_xCR_xMOD_MASK, params_channels(params) > 1 ?
543 ESAI_xCR_xMOD_NETWORK : 0);
544
545 regmap_update_bits(esai_priv->regmap, REG_ESAI_xFCR(tx),
546 ESAI_xFCR_xFR_MASK, ESAI_xFCR_xFR);
547
548 mask = ESAI_xFCR_xFR_MASK | ESAI_xFCR_xWA_MASK | ESAI_xFCR_xFWM_MASK |
549 (tx ? ESAI_xFCR_TE_MASK | ESAI_xFCR_TIEN : ESAI_xFCR_RE_MASK);
550 val = ESAI_xFCR_xWA(width) | ESAI_xFCR_xFWM(esai_priv->fifo_depth) |
551 (tx ? ESAI_xFCR_TE(pins) | ESAI_xFCR_TIEN : ESAI_xFCR_RE(pins));
552
553 regmap_update_bits(esai_priv->regmap, REG_ESAI_xFCR(tx), mask, val);
554
555 mask = ESAI_xCR_xSWS_MASK | (tx ? ESAI_xCR_PADC : 0);
556 val = ESAI_xCR_xSWS(slot_width, width) | (tx ? ESAI_xCR_PADC : 0);
557
558 regmap_update_bits(esai_priv->regmap, REG_ESAI_xCR(tx), mask, val);
559
560 /* Remove ESAI personal reset by configuring ESAI_PCRC and ESAI_PRRC */
561 regmap_update_bits(esai_priv->regmap, REG_ESAI_PRRC,
562 ESAI_PRRC_PDC_MASK, ESAI_PRRC_PDC(ESAI_GPIO));
563 regmap_update_bits(esai_priv->regmap, REG_ESAI_PCRC,
564 ESAI_PCRC_PC_MASK, ESAI_PCRC_PC(ESAI_GPIO));
565 return 0;
566 }
567
568 static void fsl_esai_shutdown(struct snd_pcm_substream *substream,
569 struct snd_soc_dai *dai)
570 {
571 struct fsl_esai *esai_priv = snd_soc_dai_get_drvdata(dai);
572
573 if (!IS_ERR(esai_priv->fsysclk))
574 clk_disable_unprepare(esai_priv->fsysclk);
575 if (!IS_ERR(esai_priv->extalclk))
576 clk_disable_unprepare(esai_priv->extalclk);
577 if (!IS_ERR(esai_priv->spbaclk))
578 clk_disable_unprepare(esai_priv->spbaclk);
579 clk_disable_unprepare(esai_priv->coreclk);
580 }
581
582 static int fsl_esai_trigger(struct snd_pcm_substream *substream, int cmd,
583 struct snd_soc_dai *dai)
584 {
585 struct fsl_esai *esai_priv = snd_soc_dai_get_drvdata(dai);
586 bool tx = substream->stream == SNDRV_PCM_STREAM_PLAYBACK;
587 u8 i, channels = substream->runtime->channels;
588 u32 pins = DIV_ROUND_UP(channels, esai_priv->slots);
589
590 switch (cmd) {
591 case SNDRV_PCM_TRIGGER_START:
592 case SNDRV_PCM_TRIGGER_RESUME:
593 case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
594 regmap_update_bits(esai_priv->regmap, REG_ESAI_xFCR(tx),
595 ESAI_xFCR_xFEN_MASK, ESAI_xFCR_xFEN);
596
597 /* Write initial words reqiured by ESAI as normal procedure */
598 for (i = 0; tx && i < channels; i++)
599 regmap_write(esai_priv->regmap, REG_ESAI_ETDR, 0x0);
600
601 regmap_update_bits(esai_priv->regmap, REG_ESAI_xCR(tx),
602 tx ? ESAI_xCR_TE_MASK : ESAI_xCR_RE_MASK,
603 tx ? ESAI_xCR_TE(pins) : ESAI_xCR_RE(pins));
604 break;
605 case SNDRV_PCM_TRIGGER_SUSPEND:
606 case SNDRV_PCM_TRIGGER_STOP:
607 case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
608 regmap_update_bits(esai_priv->regmap, REG_ESAI_xCR(tx),
609 tx ? ESAI_xCR_TE_MASK : ESAI_xCR_RE_MASK, 0);
610
611 /* Disable and reset FIFO */
612 regmap_update_bits(esai_priv->regmap, REG_ESAI_xFCR(tx),
613 ESAI_xFCR_xFR | ESAI_xFCR_xFEN, ESAI_xFCR_xFR);
614 regmap_update_bits(esai_priv->regmap, REG_ESAI_xFCR(tx),
615 ESAI_xFCR_xFR, 0);
616 break;
617 default:
618 return -EINVAL;
619 }
620
621 return 0;
622 }
623
624 static struct snd_soc_dai_ops fsl_esai_dai_ops = {
625 .startup = fsl_esai_startup,
626 .shutdown = fsl_esai_shutdown,
627 .trigger = fsl_esai_trigger,
628 .hw_params = fsl_esai_hw_params,
629 .set_sysclk = fsl_esai_set_dai_sysclk,
630 .set_fmt = fsl_esai_set_dai_fmt,
631 .set_tdm_slot = fsl_esai_set_dai_tdm_slot,
632 };
633
634 static int fsl_esai_dai_probe(struct snd_soc_dai *dai)
635 {
636 struct fsl_esai *esai_priv = snd_soc_dai_get_drvdata(dai);
637
638 snd_soc_dai_init_dma_data(dai, &esai_priv->dma_params_tx,
639 &esai_priv->dma_params_rx);
640
641 return 0;
642 }
643
644 static struct snd_soc_dai_driver fsl_esai_dai = {
645 .probe = fsl_esai_dai_probe,
646 .playback = {
647 .stream_name = "CPU-Playback",
648 .channels_min = 1,
649 .channels_max = 12,
650 .rates = FSL_ESAI_RATES,
651 .formats = FSL_ESAI_FORMATS,
652 },
653 .capture = {
654 .stream_name = "CPU-Capture",
655 .channels_min = 1,
656 .channels_max = 8,
657 .rates = FSL_ESAI_RATES,
658 .formats = FSL_ESAI_FORMATS,
659 },
660 .ops = &fsl_esai_dai_ops,
661 };
662
663 static const struct snd_soc_component_driver fsl_esai_component = {
664 .name = "fsl-esai",
665 };
666
667 static const struct reg_default fsl_esai_reg_defaults[] = {
668 {REG_ESAI_ETDR, 0x00000000},
669 {REG_ESAI_ECR, 0x00000000},
670 {REG_ESAI_TFCR, 0x00000000},
671 {REG_ESAI_RFCR, 0x00000000},
672 {REG_ESAI_TX0, 0x00000000},
673 {REG_ESAI_TX1, 0x00000000},
674 {REG_ESAI_TX2, 0x00000000},
675 {REG_ESAI_TX3, 0x00000000},
676 {REG_ESAI_TX4, 0x00000000},
677 {REG_ESAI_TX5, 0x00000000},
678 {REG_ESAI_TSR, 0x00000000},
679 {REG_ESAI_SAICR, 0x00000000},
680 {REG_ESAI_TCR, 0x00000000},
681 {REG_ESAI_TCCR, 0x00000000},
682 {REG_ESAI_RCR, 0x00000000},
683 {REG_ESAI_RCCR, 0x00000000},
684 {REG_ESAI_TSMA, 0x0000ffff},
685 {REG_ESAI_TSMB, 0x0000ffff},
686 {REG_ESAI_RSMA, 0x0000ffff},
687 {REG_ESAI_RSMB, 0x0000ffff},
688 {REG_ESAI_PRRC, 0x00000000},
689 {REG_ESAI_PCRC, 0x00000000},
690 };
691
692 static bool fsl_esai_readable_reg(struct device *dev, unsigned int reg)
693 {
694 switch (reg) {
695 case REG_ESAI_ERDR:
696 case REG_ESAI_ECR:
697 case REG_ESAI_ESR:
698 case REG_ESAI_TFCR:
699 case REG_ESAI_TFSR:
700 case REG_ESAI_RFCR:
701 case REG_ESAI_RFSR:
702 case REG_ESAI_RX0:
703 case REG_ESAI_RX1:
704 case REG_ESAI_RX2:
705 case REG_ESAI_RX3:
706 case REG_ESAI_SAISR:
707 case REG_ESAI_SAICR:
708 case REG_ESAI_TCR:
709 case REG_ESAI_TCCR:
710 case REG_ESAI_RCR:
711 case REG_ESAI_RCCR:
712 case REG_ESAI_TSMA:
713 case REG_ESAI_TSMB:
714 case REG_ESAI_RSMA:
715 case REG_ESAI_RSMB:
716 case REG_ESAI_PRRC:
717 case REG_ESAI_PCRC:
718 return true;
719 default:
720 return false;
721 }
722 }
723
724 static bool fsl_esai_volatile_reg(struct device *dev, unsigned int reg)
725 {
726 switch (reg) {
727 case REG_ESAI_ERDR:
728 case REG_ESAI_ESR:
729 case REG_ESAI_TFSR:
730 case REG_ESAI_RFSR:
731 case REG_ESAI_RX0:
732 case REG_ESAI_RX1:
733 case REG_ESAI_RX2:
734 case REG_ESAI_RX3:
735 case REG_ESAI_SAISR:
736 return true;
737 default:
738 return false;
739 }
740 }
741
742 static bool fsl_esai_writeable_reg(struct device *dev, unsigned int reg)
743 {
744 switch (reg) {
745 case REG_ESAI_ETDR:
746 case REG_ESAI_ECR:
747 case REG_ESAI_TFCR:
748 case REG_ESAI_RFCR:
749 case REG_ESAI_TX0:
750 case REG_ESAI_TX1:
751 case REG_ESAI_TX2:
752 case REG_ESAI_TX3:
753 case REG_ESAI_TX4:
754 case REG_ESAI_TX5:
755 case REG_ESAI_TSR:
756 case REG_ESAI_SAICR:
757 case REG_ESAI_TCR:
758 case REG_ESAI_TCCR:
759 case REG_ESAI_RCR:
760 case REG_ESAI_RCCR:
761 case REG_ESAI_TSMA:
762 case REG_ESAI_TSMB:
763 case REG_ESAI_RSMA:
764 case REG_ESAI_RSMB:
765 case REG_ESAI_PRRC:
766 case REG_ESAI_PCRC:
767 return true;
768 default:
769 return false;
770 }
771 }
772
773 static const struct regmap_config fsl_esai_regmap_config = {
774 .reg_bits = 32,
775 .reg_stride = 4,
776 .val_bits = 32,
777
778 .max_register = REG_ESAI_PCRC,
779 .reg_defaults = fsl_esai_reg_defaults,
780 .num_reg_defaults = ARRAY_SIZE(fsl_esai_reg_defaults),
781 .readable_reg = fsl_esai_readable_reg,
782 .volatile_reg = fsl_esai_volatile_reg,
783 .writeable_reg = fsl_esai_writeable_reg,
784 .cache_type = REGCACHE_FLAT,
785 };
786
787 static int fsl_esai_probe(struct platform_device *pdev)
788 {
789 struct device_node *np = pdev->dev.of_node;
790 struct fsl_esai *esai_priv;
791 struct resource *res;
792 const uint32_t *iprop;
793 void __iomem *regs;
794 int irq, ret;
795
796 esai_priv = devm_kzalloc(&pdev->dev, sizeof(*esai_priv), GFP_KERNEL);
797 if (!esai_priv)
798 return -ENOMEM;
799
800 esai_priv->pdev = pdev;
801 strncpy(esai_priv->name, np->name, sizeof(esai_priv->name) - 1);
802
803 /* Get the addresses and IRQ */
804 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
805 regs = devm_ioremap_resource(&pdev->dev, res);
806 if (IS_ERR(regs))
807 return PTR_ERR(regs);
808
809 esai_priv->regmap = devm_regmap_init_mmio_clk(&pdev->dev,
810 "core", regs, &fsl_esai_regmap_config);
811 if (IS_ERR(esai_priv->regmap)) {
812 dev_err(&pdev->dev, "failed to init regmap: %ld\n",
813 PTR_ERR(esai_priv->regmap));
814 return PTR_ERR(esai_priv->regmap);
815 }
816
817 esai_priv->coreclk = devm_clk_get(&pdev->dev, "core");
818 if (IS_ERR(esai_priv->coreclk)) {
819 dev_err(&pdev->dev, "failed to get core clock: %ld\n",
820 PTR_ERR(esai_priv->coreclk));
821 return PTR_ERR(esai_priv->coreclk);
822 }
823
824 esai_priv->extalclk = devm_clk_get(&pdev->dev, "extal");
825 if (IS_ERR(esai_priv->extalclk))
826 dev_warn(&pdev->dev, "failed to get extal clock: %ld\n",
827 PTR_ERR(esai_priv->extalclk));
828
829 esai_priv->fsysclk = devm_clk_get(&pdev->dev, "fsys");
830 if (IS_ERR(esai_priv->fsysclk))
831 dev_warn(&pdev->dev, "failed to get fsys clock: %ld\n",
832 PTR_ERR(esai_priv->fsysclk));
833
834 esai_priv->spbaclk = devm_clk_get(&pdev->dev, "spba");
835 if (IS_ERR(esai_priv->spbaclk))
836 dev_warn(&pdev->dev, "failed to get spba clock: %ld\n",
837 PTR_ERR(esai_priv->spbaclk));
838
839 irq = platform_get_irq(pdev, 0);
840 if (irq < 0) {
841 dev_err(&pdev->dev, "no irq for node %s\n", pdev->name);
842 return irq;
843 }
844
845 ret = devm_request_irq(&pdev->dev, irq, esai_isr, 0,
846 esai_priv->name, esai_priv);
847 if (ret) {
848 dev_err(&pdev->dev, "failed to claim irq %u\n", irq);
849 return ret;
850 }
851
852 /* Set a default slot number */
853 esai_priv->slots = 2;
854
855 /* Set a default master/slave state */
856 esai_priv->slave_mode = true;
857
858 /* Determine the FIFO depth */
859 iprop = of_get_property(np, "fsl,fifo-depth", NULL);
860 if (iprop)
861 esai_priv->fifo_depth = be32_to_cpup(iprop);
862 else
863 esai_priv->fifo_depth = 64;
864
865 esai_priv->dma_params_tx.maxburst = 16;
866 esai_priv->dma_params_rx.maxburst = 16;
867 esai_priv->dma_params_tx.addr = res->start + REG_ESAI_ETDR;
868 esai_priv->dma_params_rx.addr = res->start + REG_ESAI_ERDR;
869
870 esai_priv->synchronous =
871 of_property_read_bool(np, "fsl,esai-synchronous");
872
873 /* Implement full symmetry for synchronous mode */
874 if (esai_priv->synchronous) {
875 fsl_esai_dai.symmetric_rates = 1;
876 fsl_esai_dai.symmetric_channels = 1;
877 fsl_esai_dai.symmetric_samplebits = 1;
878 }
879
880 dev_set_drvdata(&pdev->dev, esai_priv);
881
882 /* Reset ESAI unit */
883 ret = regmap_write(esai_priv->regmap, REG_ESAI_ECR, ESAI_ECR_ERST);
884 if (ret) {
885 dev_err(&pdev->dev, "failed to reset ESAI: %d\n", ret);
886 return ret;
887 }
888
889 /*
890 * We need to enable ESAI so as to access some of its registers.
891 * Otherwise, we would fail to dump regmap from user space.
892 */
893 ret = regmap_write(esai_priv->regmap, REG_ESAI_ECR, ESAI_ECR_ESAIEN);
894 if (ret) {
895 dev_err(&pdev->dev, "failed to enable ESAI: %d\n", ret);
896 return ret;
897 }
898
899 ret = devm_snd_soc_register_component(&pdev->dev, &fsl_esai_component,
900 &fsl_esai_dai, 1);
901 if (ret) {
902 dev_err(&pdev->dev, "failed to register DAI: %d\n", ret);
903 return ret;
904 }
905
906 ret = imx_pcm_dma_init(pdev, IMX_ESAI_DMABUF_SIZE);
907 if (ret)
908 dev_err(&pdev->dev, "failed to init imx pcm dma: %d\n", ret);
909
910 return ret;
911 }
912
913 static const struct of_device_id fsl_esai_dt_ids[] = {
914 { .compatible = "fsl,imx35-esai", },
915 { .compatible = "fsl,vf610-esai", },
916 {}
917 };
918 MODULE_DEVICE_TABLE(of, fsl_esai_dt_ids);
919
920 #ifdef CONFIG_PM_SLEEP
921 static int fsl_esai_suspend(struct device *dev)
922 {
923 struct fsl_esai *esai = dev_get_drvdata(dev);
924
925 regcache_cache_only(esai->regmap, true);
926 regcache_mark_dirty(esai->regmap);
927
928 return 0;
929 }
930
931 static int fsl_esai_resume(struct device *dev)
932 {
933 struct fsl_esai *esai = dev_get_drvdata(dev);
934 int ret;
935
936 regcache_cache_only(esai->regmap, false);
937
938 /* FIFO reset for safety */
939 regmap_update_bits(esai->regmap, REG_ESAI_TFCR,
940 ESAI_xFCR_xFR, ESAI_xFCR_xFR);
941 regmap_update_bits(esai->regmap, REG_ESAI_RFCR,
942 ESAI_xFCR_xFR, ESAI_xFCR_xFR);
943
944 ret = regcache_sync(esai->regmap);
945 if (ret)
946 return ret;
947
948 /* FIFO reset done */
949 regmap_update_bits(esai->regmap, REG_ESAI_TFCR, ESAI_xFCR_xFR, 0);
950 regmap_update_bits(esai->regmap, REG_ESAI_RFCR, ESAI_xFCR_xFR, 0);
951
952 return 0;
953 }
954 #endif /* CONFIG_PM_SLEEP */
955
956 static const struct dev_pm_ops fsl_esai_pm_ops = {
957 SET_SYSTEM_SLEEP_PM_OPS(fsl_esai_suspend, fsl_esai_resume)
958 };
959
960 static struct platform_driver fsl_esai_driver = {
961 .probe = fsl_esai_probe,
962 .driver = {
963 .name = "fsl-esai-dai",
964 .pm = &fsl_esai_pm_ops,
965 .of_match_table = fsl_esai_dt_ids,
966 },
967 };
968
969 module_platform_driver(fsl_esai_driver);
970
971 MODULE_AUTHOR("Freescale Semiconductor, Inc.");
972 MODULE_DESCRIPTION("Freescale ESAI CPU DAI driver");
973 MODULE_LICENSE("GPL v2");
974 MODULE_ALIAS("platform:fsl-esai-dai");
Linux with added FPC-III support