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Merge branch 'x86-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel...
[cris-mirror.git] / sound / soc / fsl / fsl_esai.c
blobcef79a1a620b7dc3105572e6987c358da8db8a30
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_FORMATS (SNDRV_PCM_FMTBIT_S8 | \
23 SNDRV_PCM_FMTBIT_S16_LE | \
24 SNDRV_PCM_FMTBIT_S20_3LE | \
25 SNDRV_PCM_FMTBIT_S24_LE)
26
27 /**
28 * fsl_esai: ESAI private data
29 *
30 * @dma_params_rx: DMA parameters for receive channel
31 * @dma_params_tx: DMA parameters for transmit channel
32 * @pdev: platform device pointer
33 * @regmap: regmap handler
34 * @coreclk: clock source to access register
35 * @extalclk: esai clock source to derive HCK, SCK and FS
36 * @fsysclk: system clock source to derive HCK, SCK and FS
37 * @spbaclk: SPBA clock (optional, depending on SoC design)
38 * @fifo_depth: depth of tx/rx FIFO
39 * @slot_width: width of each DAI slot
40 * @slots: number of slots
41 * @hck_rate: clock rate of desired HCKx clock
42 * @sck_rate: clock rate of desired SCKx clock
43 * @hck_dir: the direction of HCKx pads
44 * @sck_div: if using PSR/PM dividers for SCKx clock
45 * @slave_mode: if fully using DAI slave mode
46 * @synchronous: if using tx/rx synchronous mode
47 * @name: driver name
48 */
49 struct fsl_esai {
50 struct snd_dmaengine_dai_dma_data dma_params_rx;
51 struct snd_dmaengine_dai_dma_data dma_params_tx;
52 struct platform_device *pdev;
53 struct regmap *regmap;
54 struct clk *coreclk;
55 struct clk *extalclk;
56 struct clk *fsysclk;
57 struct clk *spbaclk;
58 u32 fifo_depth;
59 u32 slot_width;
60 u32 slots;
61 u32 hck_rate[2];
62 u32 sck_rate[2];
63 bool hck_dir[2];
64 bool sck_div[2];
65 bool slave_mode;
66 bool synchronous;
67 char name[32];
68 };
69
70 static irqreturn_t esai_isr(int irq, void *devid)
71 {
72 struct fsl_esai *esai_priv = (struct fsl_esai *)devid;
73 struct platform_device *pdev = esai_priv->pdev;
74 u32 esr;
75
76 regmap_read(esai_priv->regmap, REG_ESAI_ESR, &esr);
77
78 if (esr & ESAI_ESR_TINIT_MASK)
79 dev_dbg(&pdev->dev, "isr: Transmission Initialized\n");
80
81 if (esr & ESAI_ESR_RFF_MASK)
82 dev_warn(&pdev->dev, "isr: Receiving overrun\n");
83
84 if (esr & ESAI_ESR_TFE_MASK)
85 dev_warn(&pdev->dev, "isr: Transmission underrun\n");
86
87 if (esr & ESAI_ESR_TLS_MASK)
88 dev_dbg(&pdev->dev, "isr: Just transmitted the last slot\n");
89
90 if (esr & ESAI_ESR_TDE_MASK)
91 dev_dbg(&pdev->dev, "isr: Transmission data exception\n");
92
93 if (esr & ESAI_ESR_TED_MASK)
94 dev_dbg(&pdev->dev, "isr: Transmitting even slots\n");
95
96 if (esr & ESAI_ESR_TD_MASK)
97 dev_dbg(&pdev->dev, "isr: Transmitting data\n");
98
99 if (esr & ESAI_ESR_RLS_MASK)
100 dev_dbg(&pdev->dev, "isr: Just received the last slot\n");
101
102 if (esr & ESAI_ESR_RDE_MASK)
103 dev_dbg(&pdev->dev, "isr: Receiving data exception\n");
104
105 if (esr & ESAI_ESR_RED_MASK)
106 dev_dbg(&pdev->dev, "isr: Receiving even slots\n");
107
108 if (esr & ESAI_ESR_RD_MASK)
109 dev_dbg(&pdev->dev, "isr: Receiving data\n");
110
111 return IRQ_HANDLED;
112 }
113
114 /**
115 * This function is used to calculate the divisors of psr, pm, fp and it is
116 * supposed to be called in set_dai_sysclk() and set_bclk().
117 *
118 * @ratio: desired overall ratio for the paticipating dividers
119 * @usefp: for HCK setting, there is no need to set fp divider
120 * @fp: bypass other dividers by setting fp directly if fp != 0
121 * @tx: current setting is for playback or capture
122 */
123 static int fsl_esai_divisor_cal(struct snd_soc_dai *dai, bool tx, u32 ratio,
124 bool usefp, u32 fp)
125 {
126 struct fsl_esai *esai_priv = snd_soc_dai_get_drvdata(dai);
127 u32 psr, pm = 999, maxfp, prod, sub, savesub, i, j;
128
129 maxfp = usefp ? 16 : 1;
130
131 if (usefp && fp)
132 goto out_fp;
133
134 if (ratio > 2 * 8 * 256 * maxfp || ratio < 2) {
135 dev_err(dai->dev, "the ratio is out of range (2 ~ %d)\n",
136 2 * 8 * 256 * maxfp);
137 return -EINVAL;
138 } else if (ratio % 2) {
139 dev_err(dai->dev, "the raio must be even if using upper divider\n");
140 return -EINVAL;
141 }
142
143 ratio /= 2;
144
145 psr = ratio <= 256 * maxfp ? ESAI_xCCR_xPSR_BYPASS : ESAI_xCCR_xPSR_DIV8;
146
147 /* Set the max fluctuation -- 0.1% of the max devisor */
148 savesub = (psr ? 1 : 8) * 256 * maxfp / 1000;
149
150 /* Find the best value for PM */
151 for (i = 1; i <= 256; i++) {
152 for (j = 1; j <= maxfp; j++) {
153 /* PSR (1 or 8) * PM (1 ~ 256) * FP (1 ~ 16) */
154 prod = (psr ? 1 : 8) * i * j;
155
156 if (prod == ratio)
157 sub = 0;
158 else if (prod / ratio == 1)
159 sub = prod - ratio;
160 else if (ratio / prod == 1)
161 sub = ratio - prod;
162 else
163 continue;
164
165 /* Calculate the fraction */
166 sub = sub * 1000 / ratio;
167 if (sub < savesub) {
168 savesub = sub;
169 pm = i;
170 fp = j;
171 }
172
173 /* We are lucky */
174 if (savesub == 0)
175 goto out;
176 }
177 }
178
179 if (pm == 999) {
180 dev_err(dai->dev, "failed to calculate proper divisors\n");
181 return -EINVAL;
182 }
183
184 out:
185 regmap_update_bits(esai_priv->regmap, REG_ESAI_xCCR(tx),
186 ESAI_xCCR_xPSR_MASK | ESAI_xCCR_xPM_MASK,
187 psr | ESAI_xCCR_xPM(pm));
188
189 out_fp:
190 /* Bypass fp if not being required */
191 if (maxfp <= 1)
192 return 0;
193
194 regmap_update_bits(esai_priv->regmap, REG_ESAI_xCCR(tx),
195 ESAI_xCCR_xFP_MASK, ESAI_xCCR_xFP(fp));
196
197 return 0;
198 }
199
200 /**
201 * This function mainly configures the clock frequency of MCLK (HCKT/HCKR)
202 *
203 * @Parameters:
204 * clk_id: The clock source of HCKT/HCKR
205 * (Input from outside; output from inside, FSYS or EXTAL)
206 * freq: The required clock rate of HCKT/HCKR
207 * dir: The clock direction of HCKT/HCKR
208 *
209 * Note: If the direction is input, we do not care about clk_id.
210 */
211 static int fsl_esai_set_dai_sysclk(struct snd_soc_dai *dai, int clk_id,
212 unsigned int freq, int dir)
213 {
214 struct fsl_esai *esai_priv = snd_soc_dai_get_drvdata(dai);
215 struct clk *clksrc = esai_priv->extalclk;
216 bool tx = clk_id <= ESAI_HCKT_EXTAL;
217 bool in = dir == SND_SOC_CLOCK_IN;
218 u32 ratio, ecr = 0;
219 unsigned long clk_rate;
220 int ret;
221
222 /* Bypass divider settings if the requirement doesn't change */
223 if (freq == esai_priv->hck_rate[tx] && dir == esai_priv->hck_dir[tx])
224 return 0;
225
226 /* sck_div can be only bypassed if ETO/ERO=0 and SNC_SOC_CLOCK_OUT */
227 esai_priv->sck_div[tx] = true;
228
229 /* Set the direction of HCKT/HCKR pins */
230 regmap_update_bits(esai_priv->regmap, REG_ESAI_xCCR(tx),
231 ESAI_xCCR_xHCKD, in ? 0 : ESAI_xCCR_xHCKD);
232
233 if (in)
234 goto out;
235
236 switch (clk_id) {
237 case ESAI_HCKT_FSYS:
238 case ESAI_HCKR_FSYS:
239 clksrc = esai_priv->fsysclk;
240 break;
241 case ESAI_HCKT_EXTAL:
242 ecr |= ESAI_ECR_ETI;
243 case ESAI_HCKR_EXTAL:
244 ecr |= ESAI_ECR_ERI;
245 break;
246 default:
247 return -EINVAL;
248 }
249
250 if (IS_ERR(clksrc)) {
251 dev_err(dai->dev, "no assigned %s clock\n",
252 clk_id % 2 ? "extal" : "fsys");
253 return PTR_ERR(clksrc);
254 }
255 clk_rate = clk_get_rate(clksrc);
256
257 ratio = clk_rate / freq;
258 if (ratio * freq > clk_rate)
259 ret = ratio * freq - clk_rate;
260 else if (ratio * freq < clk_rate)
261 ret = clk_rate - ratio * freq;
262 else
263 ret = 0;
264
265 /* Block if clock source can not be divided into the required rate */
266 if (ret != 0 && clk_rate / ret < 1000) {
267 dev_err(dai->dev, "failed to derive required HCK%c rate\n",
268 tx ? 'T' : 'R');
269 return -EINVAL;
270 }
271
272 /* Only EXTAL source can be output directly without using PSR and PM */
273 if (ratio == 1 && clksrc == esai_priv->extalclk) {
274 /* Bypass all the dividers if not being needed */
275 ecr |= tx ? ESAI_ECR_ETO : ESAI_ECR_ERO;
276 goto out;
277 } else if (ratio < 2) {
278 /* The ratio should be no less than 2 if using other sources */
279 dev_err(dai->dev, "failed to derive required HCK%c rate\n",
280 tx ? 'T' : 'R');
281 return -EINVAL;
282 }
283
284 ret = fsl_esai_divisor_cal(dai, tx, ratio, false, 0);
285 if (ret)
286 return ret;
287
288 esai_priv->sck_div[tx] = false;
289
290 out:
291 esai_priv->hck_dir[tx] = dir;
292 esai_priv->hck_rate[tx] = freq;
293
294 regmap_update_bits(esai_priv->regmap, REG_ESAI_ECR,
295 tx ? ESAI_ECR_ETI | ESAI_ECR_ETO :
296 ESAI_ECR_ERI | ESAI_ECR_ERO, ecr);
297
298 return 0;
299 }
300
301 /**
302 * This function configures the related dividers according to the bclk rate
303 */
304 static int fsl_esai_set_bclk(struct snd_soc_dai *dai, bool tx, u32 freq)
305 {
306 struct fsl_esai *esai_priv = snd_soc_dai_get_drvdata(dai);
307 u32 hck_rate = esai_priv->hck_rate[tx];
308 u32 sub, ratio = hck_rate / freq;
309 int ret;
310
311 /* Don't apply for fully slave mode or unchanged bclk */
312 if (esai_priv->slave_mode || esai_priv->sck_rate[tx] == freq)
313 return 0;
314
315 if (ratio * freq > hck_rate)
316 sub = ratio * freq - hck_rate;
317 else if (ratio * freq < hck_rate)
318 sub = hck_rate - ratio * freq;
319 else
320 sub = 0;
321
322 /* Block if clock source can not be divided into the required rate */
323 if (sub != 0 && hck_rate / sub < 1000) {
324 dev_err(dai->dev, "failed to derive required SCK%c rate\n",
325 tx ? 'T' : 'R');
326 return -EINVAL;
327 }
328
329 /* The ratio should be contented by FP alone if bypassing PM and PSR */
330 if (!esai_priv->sck_div[tx] && (ratio > 16 || ratio == 0)) {
331 dev_err(dai->dev, "the ratio is out of range (1 ~ 16)\n");
332 return -EINVAL;
333 }
334
335 ret = fsl_esai_divisor_cal(dai, tx, ratio, true,
336 esai_priv->sck_div[tx] ? 0 : ratio);
337 if (ret)
338 return ret;
339
340 /* Save current bclk rate */
341 esai_priv->sck_rate[tx] = freq;
342
343 return 0;
344 }
345
346 static int fsl_esai_set_dai_tdm_slot(struct snd_soc_dai *dai, u32 tx_mask,
347 u32 rx_mask, int slots, int slot_width)
348 {
349 struct fsl_esai *esai_priv = snd_soc_dai_get_drvdata(dai);
350
351 regmap_update_bits(esai_priv->regmap, REG_ESAI_TCCR,
352 ESAI_xCCR_xDC_MASK, ESAI_xCCR_xDC(slots));
353
354 regmap_update_bits(esai_priv->regmap, REG_ESAI_TSMA,
355 ESAI_xSMA_xS_MASK, ESAI_xSMA_xS(tx_mask));
356 regmap_update_bits(esai_priv->regmap, REG_ESAI_TSMB,
357 ESAI_xSMB_xS_MASK, ESAI_xSMB_xS(tx_mask));
358
359 regmap_update_bits(esai_priv->regmap, REG_ESAI_RCCR,
360 ESAI_xCCR_xDC_MASK, ESAI_xCCR_xDC(slots));
361
362 regmap_update_bits(esai_priv->regmap, REG_ESAI_RSMA,
363 ESAI_xSMA_xS_MASK, ESAI_xSMA_xS(rx_mask));
364 regmap_update_bits(esai_priv->regmap, REG_ESAI_RSMB,
365 ESAI_xSMB_xS_MASK, ESAI_xSMB_xS(rx_mask));
366
367 esai_priv->slot_width = slot_width;
368 esai_priv->slots = slots;
369
370 return 0;
371 }
372
373 static int fsl_esai_set_dai_fmt(struct snd_soc_dai *dai, unsigned int fmt)
374 {
375 struct fsl_esai *esai_priv = snd_soc_dai_get_drvdata(dai);
376 u32 xcr = 0, xccr = 0, mask;
377
378 /* DAI mode */
379 switch (fmt & SND_SOC_DAIFMT_FORMAT_MASK) {
380 case SND_SOC_DAIFMT_I2S:
381 /* Data on rising edge of bclk, frame low, 1clk before data */
382 xcr |= ESAI_xCR_xFSR;
383 xccr |= ESAI_xCCR_xFSP | ESAI_xCCR_xCKP | ESAI_xCCR_xHCKP;
384 break;
385 case SND_SOC_DAIFMT_LEFT_J:
386 /* Data on rising edge of bclk, frame high */
387 xccr |= ESAI_xCCR_xCKP | ESAI_xCCR_xHCKP;
388 break;
389 case SND_SOC_DAIFMT_RIGHT_J:
390 /* Data on rising edge of bclk, frame high, right aligned */
391 xccr |= ESAI_xCCR_xCKP | ESAI_xCCR_xHCKP | ESAI_xCR_xWA;
392 break;
393 case SND_SOC_DAIFMT_DSP_A:
394 /* Data on rising edge of bclk, frame high, 1clk before data */
395 xcr |= ESAI_xCR_xFSL | ESAI_xCR_xFSR;
396 xccr |= ESAI_xCCR_xCKP | ESAI_xCCR_xHCKP;
397 break;
398 case SND_SOC_DAIFMT_DSP_B:
399 /* Data on rising edge of bclk, frame high */
400 xcr |= ESAI_xCR_xFSL;
401 xccr |= ESAI_xCCR_xCKP | ESAI_xCCR_xHCKP;
402 break;
403 default:
404 return -EINVAL;
405 }
406
407 /* DAI clock inversion */
408 switch (fmt & SND_SOC_DAIFMT_INV_MASK) {
409 case SND_SOC_DAIFMT_NB_NF:
410 /* Nothing to do for both normal cases */
411 break;
412 case SND_SOC_DAIFMT_IB_NF:
413 /* Invert bit clock */
414 xccr ^= ESAI_xCCR_xCKP | ESAI_xCCR_xHCKP;
415 break;
416 case SND_SOC_DAIFMT_NB_IF:
417 /* Invert frame clock */
418 xccr ^= ESAI_xCCR_xFSP;
419 break;
420 case SND_SOC_DAIFMT_IB_IF:
421 /* Invert both clocks */
422 xccr ^= ESAI_xCCR_xCKP | ESAI_xCCR_xHCKP | ESAI_xCCR_xFSP;
423 break;
424 default:
425 return -EINVAL;
426 }
427
428 esai_priv->slave_mode = false;
429
430 /* DAI clock master masks */
431 switch (fmt & SND_SOC_DAIFMT_MASTER_MASK) {
432 case SND_SOC_DAIFMT_CBM_CFM:
433 esai_priv->slave_mode = true;
434 break;
435 case SND_SOC_DAIFMT_CBS_CFM:
436 xccr |= ESAI_xCCR_xCKD;
437 break;
438 case SND_SOC_DAIFMT_CBM_CFS:
439 xccr |= ESAI_xCCR_xFSD;
440 break;
441 case SND_SOC_DAIFMT_CBS_CFS:
442 xccr |= ESAI_xCCR_xFSD | ESAI_xCCR_xCKD;
443 break;
444 default:
445 return -EINVAL;
446 }
447
448 mask = ESAI_xCR_xFSL | ESAI_xCR_xFSR;
449 regmap_update_bits(esai_priv->regmap, REG_ESAI_TCR, mask, xcr);
450 regmap_update_bits(esai_priv->regmap, REG_ESAI_RCR, mask, xcr);
451
452 mask = ESAI_xCCR_xCKP | ESAI_xCCR_xHCKP | ESAI_xCCR_xFSP |
453 ESAI_xCCR_xFSD | ESAI_xCCR_xCKD | ESAI_xCR_xWA;
454 regmap_update_bits(esai_priv->regmap, REG_ESAI_TCCR, mask, xccr);
455 regmap_update_bits(esai_priv->regmap, REG_ESAI_RCCR, mask, xccr);
456
457 return 0;
458 }
459
460 static int fsl_esai_startup(struct snd_pcm_substream *substream,
461 struct snd_soc_dai *dai)
462 {
463 struct fsl_esai *esai_priv = snd_soc_dai_get_drvdata(dai);
464 int ret;
465
466 /*
467 * Some platforms might use the same bit to gate all three or two of
468 * clocks, so keep all clocks open/close at the same time for safety
469 */
470 ret = clk_prepare_enable(esai_priv->coreclk);
471 if (ret)
472 return ret;
473 if (!IS_ERR(esai_priv->spbaclk)) {
474 ret = clk_prepare_enable(esai_priv->spbaclk);
475 if (ret)
476 goto err_spbaclk;
477 }
478 if (!IS_ERR(esai_priv->extalclk)) {
479 ret = clk_prepare_enable(esai_priv->extalclk);
480 if (ret)
481 goto err_extalck;
482 }
483 if (!IS_ERR(esai_priv->fsysclk)) {
484 ret = clk_prepare_enable(esai_priv->fsysclk);
485 if (ret)
486 goto err_fsysclk;
487 }
488
489 if (!dai->active) {
490 /* Set synchronous mode */
491 regmap_update_bits(esai_priv->regmap, REG_ESAI_SAICR,
492 ESAI_SAICR_SYNC, esai_priv->synchronous ?
493 ESAI_SAICR_SYNC : 0);
494
495 /* Set a default slot number -- 2 */
496 regmap_update_bits(esai_priv->regmap, REG_ESAI_TCCR,
497 ESAI_xCCR_xDC_MASK, ESAI_xCCR_xDC(2));
498 regmap_update_bits(esai_priv->regmap, REG_ESAI_RCCR,
499 ESAI_xCCR_xDC_MASK, ESAI_xCCR_xDC(2));
500 }
501
502 return 0;
503
504 err_fsysclk:
505 if (!IS_ERR(esai_priv->extalclk))
506 clk_disable_unprepare(esai_priv->extalclk);
507 err_extalck:
508 if (!IS_ERR(esai_priv->spbaclk))
509 clk_disable_unprepare(esai_priv->spbaclk);
510 err_spbaclk:
511 clk_disable_unprepare(esai_priv->coreclk);
512
513 return ret;
514 }
515
516 static int fsl_esai_hw_params(struct snd_pcm_substream *substream,
517 struct snd_pcm_hw_params *params,
518 struct snd_soc_dai *dai)
519 {
520 struct fsl_esai *esai_priv = snd_soc_dai_get_drvdata(dai);
521 bool tx = substream->stream == SNDRV_PCM_STREAM_PLAYBACK;
522 u32 width = params_width(params);
523 u32 channels = params_channels(params);
524 u32 pins = DIV_ROUND_UP(channels, esai_priv->slots);
525 u32 slot_width = width;
526 u32 bclk, mask, val;
527 int ret;
528
529 /* Override slot_width if being specifically set */
530 if (esai_priv->slot_width)
531 slot_width = esai_priv->slot_width;
532
533 bclk = params_rate(params) * slot_width * esai_priv->slots;
534
535 ret = fsl_esai_set_bclk(dai, tx, bclk);
536 if (ret)
537 return ret;
538
539 /* Use Normal mode to support monaural audio */
540 regmap_update_bits(esai_priv->regmap, REG_ESAI_xCR(tx),
541 ESAI_xCR_xMOD_MASK, params_channels(params) > 1 ?
542 ESAI_xCR_xMOD_NETWORK : 0);
543
544 regmap_update_bits(esai_priv->regmap, REG_ESAI_xFCR(tx),
545 ESAI_xFCR_xFR_MASK, ESAI_xFCR_xFR);
546
547 mask = ESAI_xFCR_xFR_MASK | ESAI_xFCR_xWA_MASK | ESAI_xFCR_xFWM_MASK |
548 (tx ? ESAI_xFCR_TE_MASK | ESAI_xFCR_TIEN : ESAI_xFCR_RE_MASK);
549 val = ESAI_xFCR_xWA(width) | ESAI_xFCR_xFWM(esai_priv->fifo_depth) |
550 (tx ? ESAI_xFCR_TE(pins) | ESAI_xFCR_TIEN : ESAI_xFCR_RE(pins));
551
552 regmap_update_bits(esai_priv->regmap, REG_ESAI_xFCR(tx), mask, val);
553
554 mask = ESAI_xCR_xSWS_MASK | (tx ? ESAI_xCR_PADC : 0);
555 val = ESAI_xCR_xSWS(slot_width, width) | (tx ? ESAI_xCR_PADC : 0);
556
557 regmap_update_bits(esai_priv->regmap, REG_ESAI_xCR(tx), mask, val);
558
559 /* Remove ESAI personal reset by configuring ESAI_PCRC and ESAI_PRRC */
560 regmap_update_bits(esai_priv->regmap, REG_ESAI_PRRC,
561 ESAI_PRRC_PDC_MASK, ESAI_PRRC_PDC(ESAI_GPIO));
562 regmap_update_bits(esai_priv->regmap, REG_ESAI_PCRC,
563 ESAI_PCRC_PC_MASK, ESAI_PCRC_PC(ESAI_GPIO));
564 return 0;
565 }
566
567 static void fsl_esai_shutdown(struct snd_pcm_substream *substream,
568 struct snd_soc_dai *dai)
569 {
570 struct fsl_esai *esai_priv = snd_soc_dai_get_drvdata(dai);
571
572 if (!IS_ERR(esai_priv->fsysclk))
573 clk_disable_unprepare(esai_priv->fsysclk);
574 if (!IS_ERR(esai_priv->extalclk))
575 clk_disable_unprepare(esai_priv->extalclk);
576 if (!IS_ERR(esai_priv->spbaclk))
577 clk_disable_unprepare(esai_priv->spbaclk);
578 clk_disable_unprepare(esai_priv->coreclk);
579 }
580
581 static int fsl_esai_trigger(struct snd_pcm_substream *substream, int cmd,
582 struct snd_soc_dai *dai)
583 {
584 struct fsl_esai *esai_priv = snd_soc_dai_get_drvdata(dai);
585 bool tx = substream->stream == SNDRV_PCM_STREAM_PLAYBACK;
586 u8 i, channels = substream->runtime->channels;
587 u32 pins = DIV_ROUND_UP(channels, esai_priv->slots);
588
589 switch (cmd) {
590 case SNDRV_PCM_TRIGGER_START:
591 case SNDRV_PCM_TRIGGER_RESUME:
592 case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
593 regmap_update_bits(esai_priv->regmap, REG_ESAI_xFCR(tx),
594 ESAI_xFCR_xFEN_MASK, ESAI_xFCR_xFEN);
595
596 /* Write initial words reqiured by ESAI as normal procedure */
597 for (i = 0; tx && i < channels; i++)
598 regmap_write(esai_priv->regmap, REG_ESAI_ETDR, 0x0);
599
600 regmap_update_bits(esai_priv->regmap, REG_ESAI_xCR(tx),
601 tx ? ESAI_xCR_TE_MASK : ESAI_xCR_RE_MASK,
602 tx ? ESAI_xCR_TE(pins) : ESAI_xCR_RE(pins));
603 break;
604 case SNDRV_PCM_TRIGGER_SUSPEND:
605 case SNDRV_PCM_TRIGGER_STOP:
606 case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
607 regmap_update_bits(esai_priv->regmap, REG_ESAI_xCR(tx),
608 tx ? ESAI_xCR_TE_MASK : ESAI_xCR_RE_MASK, 0);
609
610 /* Disable and reset FIFO */
611 regmap_update_bits(esai_priv->regmap, REG_ESAI_xFCR(tx),
612 ESAI_xFCR_xFR | ESAI_xFCR_xFEN, ESAI_xFCR_xFR);
613 regmap_update_bits(esai_priv->regmap, REG_ESAI_xFCR(tx),
614 ESAI_xFCR_xFR, 0);
615 break;
616 default:
617 return -EINVAL;
618 }
619
620 return 0;
621 }
622
623 static const struct snd_soc_dai_ops fsl_esai_dai_ops = {
624 .startup = fsl_esai_startup,
625 .shutdown = fsl_esai_shutdown,
626 .trigger = fsl_esai_trigger,
627 .hw_params = fsl_esai_hw_params,
628 .set_sysclk = fsl_esai_set_dai_sysclk,
629 .set_fmt = fsl_esai_set_dai_fmt,
630 .set_tdm_slot = fsl_esai_set_dai_tdm_slot,
631 };
632
633 static int fsl_esai_dai_probe(struct snd_soc_dai *dai)
634 {
635 struct fsl_esai *esai_priv = snd_soc_dai_get_drvdata(dai);
636
637 snd_soc_dai_init_dma_data(dai, &esai_priv->dma_params_tx,
638 &esai_priv->dma_params_rx);
639
640 return 0;
641 }
642
643 static struct snd_soc_dai_driver fsl_esai_dai = {
644 .probe = fsl_esai_dai_probe,
645 .playback = {
646 .stream_name = "CPU-Playback",
647 .channels_min = 1,
648 .channels_max = 12,
649 .rates = SNDRV_PCM_RATE_8000_192000,
650 .formats = FSL_ESAI_FORMATS,
651 },
652 .capture = {
653 .stream_name = "CPU-Capture",
654 .channels_min = 1,
655 .channels_max = 8,
656 .rates = SNDRV_PCM_RATE_8000_192000,
657 .formats = FSL_ESAI_FORMATS,
658 },
659 .ops = &fsl_esai_dai_ops,
660 };
661
662 static const struct snd_soc_component_driver fsl_esai_component = {
663 .name = "fsl-esai",
664 };
665
666 static const struct reg_default fsl_esai_reg_defaults[] = {
667 {REG_ESAI_ETDR, 0x00000000},
668 {REG_ESAI_ECR, 0x00000000},
669 {REG_ESAI_TFCR, 0x00000000},
670 {REG_ESAI_RFCR, 0x00000000},
671 {REG_ESAI_TX0, 0x00000000},
672 {REG_ESAI_TX1, 0x00000000},
673 {REG_ESAI_TX2, 0x00000000},
674 {REG_ESAI_TX3, 0x00000000},
675 {REG_ESAI_TX4, 0x00000000},
676 {REG_ESAI_TX5, 0x00000000},
677 {REG_ESAI_TSR, 0x00000000},
678 {REG_ESAI_SAICR, 0x00000000},
679 {REG_ESAI_TCR, 0x00000000},
680 {REG_ESAI_TCCR, 0x00000000},
681 {REG_ESAI_RCR, 0x00000000},
682 {REG_ESAI_RCCR, 0x00000000},
683 {REG_ESAI_TSMA, 0x0000ffff},
684 {REG_ESAI_TSMB, 0x0000ffff},
685 {REG_ESAI_RSMA, 0x0000ffff},
686 {REG_ESAI_RSMB, 0x0000ffff},
687 {REG_ESAI_PRRC, 0x00000000},
688 {REG_ESAI_PCRC, 0x00000000},
689 };
690
691 static bool fsl_esai_readable_reg(struct device *dev, unsigned int reg)
692 {
693 switch (reg) {
694 case REG_ESAI_ERDR:
695 case REG_ESAI_ECR:
696 case REG_ESAI_ESR:
697 case REG_ESAI_TFCR:
698 case REG_ESAI_TFSR:
699 case REG_ESAI_RFCR:
700 case REG_ESAI_RFSR:
701 case REG_ESAI_RX0:
702 case REG_ESAI_RX1:
703 case REG_ESAI_RX2:
704 case REG_ESAI_RX3:
705 case REG_ESAI_SAISR:
706 case REG_ESAI_SAICR:
707 case REG_ESAI_TCR:
708 case REG_ESAI_TCCR:
709 case REG_ESAI_RCR:
710 case REG_ESAI_RCCR:
711 case REG_ESAI_TSMA:
712 case REG_ESAI_TSMB:
713 case REG_ESAI_RSMA:
714 case REG_ESAI_RSMB:
715 case REG_ESAI_PRRC:
716 case REG_ESAI_PCRC:
717 return true;
718 default:
719 return false;
720 }
721 }
722
723 static bool fsl_esai_volatile_reg(struct device *dev, unsigned int reg)
724 {
725 switch (reg) {
726 case REG_ESAI_ERDR:
727 case REG_ESAI_ESR:
728 case REG_ESAI_TFSR:
729 case REG_ESAI_RFSR:
730 case REG_ESAI_RX0:
731 case REG_ESAI_RX1:
732 case REG_ESAI_RX2:
733 case REG_ESAI_RX3:
734 case REG_ESAI_SAISR:
735 return true;
736 default:
737 return false;
738 }
739 }
740
741 static bool fsl_esai_writeable_reg(struct device *dev, unsigned int reg)
742 {
743 switch (reg) {
744 case REG_ESAI_ETDR:
745 case REG_ESAI_ECR:
746 case REG_ESAI_TFCR:
747 case REG_ESAI_RFCR:
748 case REG_ESAI_TX0:
749 case REG_ESAI_TX1:
750 case REG_ESAI_TX2:
751 case REG_ESAI_TX3:
752 case REG_ESAI_TX4:
753 case REG_ESAI_TX5:
754 case REG_ESAI_TSR:
755 case REG_ESAI_SAICR:
756 case REG_ESAI_TCR:
757 case REG_ESAI_TCCR:
758 case REG_ESAI_RCR:
759 case REG_ESAI_RCCR:
760 case REG_ESAI_TSMA:
761 case REG_ESAI_TSMB:
762 case REG_ESAI_RSMA:
763 case REG_ESAI_RSMB:
764 case REG_ESAI_PRRC:
765 case REG_ESAI_PCRC:
766 return true;
767 default:
768 return false;
769 }
770 }
771
772 static const struct regmap_config fsl_esai_regmap_config = {
773 .reg_bits = 32,
774 .reg_stride = 4,
775 .val_bits = 32,
776
777 .max_register = REG_ESAI_PCRC,
778 .reg_defaults = fsl_esai_reg_defaults,
779 .num_reg_defaults = ARRAY_SIZE(fsl_esai_reg_defaults),
780 .readable_reg = fsl_esai_readable_reg,
781 .volatile_reg = fsl_esai_volatile_reg,
782 .writeable_reg = fsl_esai_writeable_reg,
783 .cache_type = REGCACHE_FLAT,
784 };
785
786 static int fsl_esai_probe(struct platform_device *pdev)
787 {
788 struct device_node *np = pdev->dev.of_node;
789 struct fsl_esai *esai_priv;
790 struct resource *res;
791 const uint32_t *iprop;
792 void __iomem *regs;
793 int irq, ret;
794
795 esai_priv = devm_kzalloc(&pdev->dev, sizeof(*esai_priv), GFP_KERNEL);
796 if (!esai_priv)
797 return -ENOMEM;
798
799 esai_priv->pdev = pdev;
800 strncpy(esai_priv->name, np->name, sizeof(esai_priv->name) - 1);
801
802 /* Get the addresses and IRQ */
803 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
804 regs = devm_ioremap_resource(&pdev->dev, res);
805 if (IS_ERR(regs))
806 return PTR_ERR(regs);
807
808 esai_priv->regmap = devm_regmap_init_mmio_clk(&pdev->dev,
809 "core", regs, &fsl_esai_regmap_config);
810 if (IS_ERR(esai_priv->regmap)) {
811 dev_err(&pdev->dev, "failed to init regmap: %ld\n",
812 PTR_ERR(esai_priv->regmap));
813 return PTR_ERR(esai_priv->regmap);
814 }
815
816 esai_priv->coreclk = devm_clk_get(&pdev->dev, "core");
817 if (IS_ERR(esai_priv->coreclk)) {
818 dev_err(&pdev->dev, "failed to get core clock: %ld\n",
819 PTR_ERR(esai_priv->coreclk));
820 return PTR_ERR(esai_priv->coreclk);
821 }
822
823 esai_priv->extalclk = devm_clk_get(&pdev->dev, "extal");
824 if (IS_ERR(esai_priv->extalclk))
825 dev_warn(&pdev->dev, "failed to get extal clock: %ld\n",
826 PTR_ERR(esai_priv->extalclk));
827
828 esai_priv->fsysclk = devm_clk_get(&pdev->dev, "fsys");
829 if (IS_ERR(esai_priv->fsysclk))
830 dev_warn(&pdev->dev, "failed to get fsys clock: %ld\n",
831 PTR_ERR(esai_priv->fsysclk));
832
833 esai_priv->spbaclk = devm_clk_get(&pdev->dev, "spba");
834 if (IS_ERR(esai_priv->spbaclk))
835 dev_warn(&pdev->dev, "failed to get spba clock: %ld\n",
836 PTR_ERR(esai_priv->spbaclk));
837
838 irq = platform_get_irq(pdev, 0);
839 if (irq < 0) {
840 dev_err(&pdev->dev, "no irq for node %s\n", pdev->name);
841 return irq;
842 }
843
844 ret = devm_request_irq(&pdev->dev, irq, esai_isr, 0,
845 esai_priv->name, esai_priv);
846 if (ret) {
847 dev_err(&pdev->dev, "failed to claim irq %u\n", irq);
848 return ret;
849 }
850
851 /* Set a default slot number */
852 esai_priv->slots = 2;
853
854 /* Set a default master/slave state */
855 esai_priv->slave_mode = true;
856
857 /* Determine the FIFO depth */
858 iprop = of_get_property(np, "fsl,fifo-depth", NULL);
859 if (iprop)
860 esai_priv->fifo_depth = be32_to_cpup(iprop);
861 else
862 esai_priv->fifo_depth = 64;
863
864 esai_priv->dma_params_tx.maxburst = 16;
865 esai_priv->dma_params_rx.maxburst = 16;
866 esai_priv->dma_params_tx.addr = res->start + REG_ESAI_ETDR;
867 esai_priv->dma_params_rx.addr = res->start + REG_ESAI_ERDR;
868
869 esai_priv->synchronous =
870 of_property_read_bool(np, "fsl,esai-synchronous");
871
872 /* Implement full symmetry for synchronous mode */
873 if (esai_priv->synchronous) {
874 fsl_esai_dai.symmetric_rates = 1;
875 fsl_esai_dai.symmetric_channels = 1;
876 fsl_esai_dai.symmetric_samplebits = 1;
877 }
878
879 dev_set_drvdata(&pdev->dev, esai_priv);
880
881 /* Reset ESAI unit */
882 ret = regmap_write(esai_priv->regmap, REG_ESAI_ECR, ESAI_ECR_ERST);
883 if (ret) {
884 dev_err(&pdev->dev, "failed to reset ESAI: %d\n", ret);
885 return ret;
886 }
887
888 /*
889 * We need to enable ESAI so as to access some of its registers.
890 * Otherwise, we would fail to dump regmap from user space.
891 */
892 ret = regmap_write(esai_priv->regmap, REG_ESAI_ECR, ESAI_ECR_ESAIEN);
893 if (ret) {
894 dev_err(&pdev->dev, "failed to enable ESAI: %d\n", ret);
895 return ret;
896 }
897
898 ret = devm_snd_soc_register_component(&pdev->dev, &fsl_esai_component,
899 &fsl_esai_dai, 1);
900 if (ret) {
901 dev_err(&pdev->dev, "failed to register DAI: %d\n", ret);
902 return ret;
903 }
904
905 ret = imx_pcm_dma_init(pdev, IMX_ESAI_DMABUF_SIZE);
906 if (ret)
907 dev_err(&pdev->dev, "failed to init imx pcm dma: %d\n", ret);
908
909 return ret;
910 }
911
912 static const struct of_device_id fsl_esai_dt_ids[] = {
913 { .compatible = "fsl,imx35-esai", },
914 { .compatible = "fsl,vf610-esai", },
915 {}
916 };
917 MODULE_DEVICE_TABLE(of, fsl_esai_dt_ids);
918
919 #ifdef CONFIG_PM_SLEEP
920 static int fsl_esai_suspend(struct device *dev)
921 {
922 struct fsl_esai *esai = dev_get_drvdata(dev);
923
924 regcache_cache_only(esai->regmap, true);
925 regcache_mark_dirty(esai->regmap);
926
927 return 0;
928 }
929
930 static int fsl_esai_resume(struct device *dev)
931 {
932 struct fsl_esai *esai = dev_get_drvdata(dev);
933 int ret;
934
935 regcache_cache_only(esai->regmap, false);
936
937 /* FIFO reset for safety */
938 regmap_update_bits(esai->regmap, REG_ESAI_TFCR,
939 ESAI_xFCR_xFR, ESAI_xFCR_xFR);
940 regmap_update_bits(esai->regmap, REG_ESAI_RFCR,
941 ESAI_xFCR_xFR, ESAI_xFCR_xFR);
942
943 ret = regcache_sync(esai->regmap);
944 if (ret)
945 return ret;
946
947 /* FIFO reset done */
948 regmap_update_bits(esai->regmap, REG_ESAI_TFCR, ESAI_xFCR_xFR, 0);
949 regmap_update_bits(esai->regmap, REG_ESAI_RFCR, ESAI_xFCR_xFR, 0);
950
951 return 0;
952 }
953 #endif /* CONFIG_PM_SLEEP */
954
955 static const struct dev_pm_ops fsl_esai_pm_ops = {
956 SET_SYSTEM_SLEEP_PM_OPS(fsl_esai_suspend, fsl_esai_resume)
957 };
958
959 static struct platform_driver fsl_esai_driver = {
960 .probe = fsl_esai_probe,
961 .driver = {
962 .name = "fsl-esai-dai",
963 .pm = &fsl_esai_pm_ops,
964 .of_match_table = fsl_esai_dt_ids,
965 },
966 };
967
968 module_platform_driver(fsl_esai_driver);
969
970 MODULE_AUTHOR("Freescale Semiconductor, Inc.");
971 MODULE_DESCRIPTION("Freescale ESAI CPU DAI driver");
972 MODULE_LICENSE("GPL v2");
973 MODULE_ALIAS("platform:fsl-esai-dai");
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