1 /*
2 * Freescale ALSA SoC Digital Audio Interface (SAI) driver.
3 *
4 * Copyright 2012-2015 Freescale Semiconductor, Inc.
5 *
6 * This program is free software, you can redistribute it and/or modify it
7 * under the terms of the GNU General Public License as published by the
8 * Free Software Foundation, either version 2 of the License, or(at your
9 * option) any later version.
10 *
11 */
12
13 #include <linux/clk.h>
14 #include <linux/delay.h>
15 #include <linux/dmaengine.h>
16 #include <linux/module.h>
17 #include <linux/of_address.h>
18 #include <linux/regmap.h>
19 #include <linux/slab.h>
20 #include <sound/core.h>
21 #include <sound/dmaengine_pcm.h>
22 #include <sound/pcm_params.h>
23
24 #include "fsl_sai.h"
25 #include "imx-pcm.h"
26
27 #define FSL_SAI_FLAGS (FSL_SAI_CSR_SEIE |\
28 FSL_SAI_CSR_FEIE)
29
30 static const unsigned int fsl_sai_rates[] = {
31 8000, 11025, 12000, 16000, 22050,
32 24000, 32000, 44100, 48000, 64000,
33 88200, 96000, 176400, 192000
34 };
35
36 static const struct snd_pcm_hw_constraint_list fsl_sai_rate_constraints = {
37 .count = ARRAY_SIZE(fsl_sai_rates),
38 .list = fsl_sai_rates,
39 };
40
fsl_sai_isr(int irq,void * devid)41 static irqreturn_t fsl_sai_isr(int irq, void *devid)
42 {
43 struct fsl_sai *sai = (struct fsl_sai *)devid;
44 struct device *dev = &sai->pdev->dev;
45 u32 flags, xcsr, mask;
46 bool irq_none = true;
47
48 /*
49 * Both IRQ status bits and IRQ mask bits are in the xCSR but
50 * different shifts. And we here create a mask only for those
51 * IRQs that we activated.
52 */
53 mask = (FSL_SAI_FLAGS >> FSL_SAI_CSR_xIE_SHIFT) << FSL_SAI_CSR_xF_SHIFT;
54
55 /* Tx IRQ */
56 regmap_read(sai->regmap, FSL_SAI_TCSR, &xcsr);
57 flags = xcsr & mask;
58
59 if (flags)
60 irq_none = false;
61 else
62 goto irq_rx;
63
64 if (flags & FSL_SAI_CSR_WSF)
65 dev_dbg(dev, "isr: Start of Tx word detected\n");
66
67 if (flags & FSL_SAI_CSR_SEF)
68 dev_warn(dev, "isr: Tx Frame sync error detected\n");
69
70 if (flags & FSL_SAI_CSR_FEF) {
71 dev_warn(dev, "isr: Transmit underrun detected\n");
72 /* FIFO reset for safety */
73 xcsr |= FSL_SAI_CSR_FR;
74 }
75
76 if (flags & FSL_SAI_CSR_FWF)
77 dev_dbg(dev, "isr: Enabled transmit FIFO is empty\n");
78
79 if (flags & FSL_SAI_CSR_FRF)
80 dev_dbg(dev, "isr: Transmit FIFO watermark has been reached\n");
81
82 flags &= FSL_SAI_CSR_xF_W_MASK;
83 xcsr &= ~FSL_SAI_CSR_xF_MASK;
84
85 if (flags)
86 regmap_write(sai->regmap, FSL_SAI_TCSR, flags | xcsr);
87
88 irq_rx:
89 /* Rx IRQ */
90 regmap_read(sai->regmap, FSL_SAI_RCSR, &xcsr);
91 flags = xcsr & mask;
92
93 if (flags)
94 irq_none = false;
95 else
96 goto out;
97
98 if (flags & FSL_SAI_CSR_WSF)
99 dev_dbg(dev, "isr: Start of Rx word detected\n");
100
101 if (flags & FSL_SAI_CSR_SEF)
102 dev_warn(dev, "isr: Rx Frame sync error detected\n");
103
104 if (flags & FSL_SAI_CSR_FEF) {
105 dev_warn(dev, "isr: Receive overflow detected\n");
106 /* FIFO reset for safety */
107 xcsr |= FSL_SAI_CSR_FR;
108 }
109
110 if (flags & FSL_SAI_CSR_FWF)
111 dev_dbg(dev, "isr: Enabled receive FIFO is full\n");
112
113 if (flags & FSL_SAI_CSR_FRF)
114 dev_dbg(dev, "isr: Receive FIFO watermark has been reached\n");
115
116 flags &= FSL_SAI_CSR_xF_W_MASK;
117 xcsr &= ~FSL_SAI_CSR_xF_MASK;
118
119 if (flags)
120 regmap_write(sai->regmap, FSL_SAI_RCSR, flags | xcsr);
121
122 out:
123 if (irq_none)
124 return IRQ_NONE;
125 else
126 return IRQ_HANDLED;
127 }
128
fsl_sai_set_dai_sysclk_tr(struct snd_soc_dai * cpu_dai,int clk_id,unsigned int freq,int fsl_dir)129 static int fsl_sai_set_dai_sysclk_tr(struct snd_soc_dai *cpu_dai,
130 int clk_id, unsigned int freq, int fsl_dir)
131 {
132 struct fsl_sai *sai = snd_soc_dai_get_drvdata(cpu_dai);
133 bool tx = fsl_dir == FSL_FMT_TRANSMITTER;
134 u32 val_cr2 = 0;
135
136 switch (clk_id) {
137 case FSL_SAI_CLK_BUS:
138 val_cr2 |= FSL_SAI_CR2_MSEL_BUS;
139 break;
140 case FSL_SAI_CLK_MAST1:
141 val_cr2 |= FSL_SAI_CR2_MSEL_MCLK1;
142 break;
143 case FSL_SAI_CLK_MAST2:
144 val_cr2 |= FSL_SAI_CR2_MSEL_MCLK2;
145 break;
146 case FSL_SAI_CLK_MAST3:
147 val_cr2 |= FSL_SAI_CR2_MSEL_MCLK3;
148 break;
149 default:
150 return -EINVAL;
151 }
152
153 regmap_update_bits(sai->regmap, FSL_SAI_xCR2(tx),
154 FSL_SAI_CR2_MSEL_MASK, val_cr2);
155
156 return 0;
157 }
158
fsl_sai_set_dai_sysclk(struct snd_soc_dai * cpu_dai,int clk_id,unsigned int freq,int dir)159 static int fsl_sai_set_dai_sysclk(struct snd_soc_dai *cpu_dai,
160 int clk_id, unsigned int freq, int dir)
161 {
162 int ret;
163
164 if (dir == SND_SOC_CLOCK_IN)
165 return 0;
166
167 ret = fsl_sai_set_dai_sysclk_tr(cpu_dai, clk_id, freq,
168 FSL_FMT_TRANSMITTER);
169 if (ret) {
170 dev_err(cpu_dai->dev, "Cannot set tx sysclk: %d\n", ret);
171 return ret;
172 }
173
174 ret = fsl_sai_set_dai_sysclk_tr(cpu_dai, clk_id, freq,
175 FSL_FMT_RECEIVER);
176 if (ret)
177 dev_err(cpu_dai->dev, "Cannot set rx sysclk: %d\n", ret);
178
179 return ret;
180 }
181
fsl_sai_set_dai_fmt_tr(struct snd_soc_dai * cpu_dai,unsigned int fmt,int fsl_dir)182 static int fsl_sai_set_dai_fmt_tr(struct snd_soc_dai *cpu_dai,
183 unsigned int fmt, int fsl_dir)
184 {
185 struct fsl_sai *sai = snd_soc_dai_get_drvdata(cpu_dai);
186 bool tx = fsl_dir == FSL_FMT_TRANSMITTER;
187 u32 val_cr2 = 0, val_cr4 = 0;
188
189 if (!sai->is_lsb_first)
190 val_cr4 |= FSL_SAI_CR4_MF;
191
192 /* DAI mode */
193 switch (fmt & SND_SOC_DAIFMT_FORMAT_MASK) {
194 case SND_SOC_DAIFMT_I2S:
195 /*
196 * Frame low, 1clk before data, one word length for frame sync,
197 * frame sync starts one serial clock cycle earlier,
198 * that is, together with the last bit of the previous
199 * data word.
200 */
201 val_cr2 |= FSL_SAI_CR2_BCP;
202 val_cr4 |= FSL_SAI_CR4_FSE | FSL_SAI_CR4_FSP;
203 break;
204 case SND_SOC_DAIFMT_LEFT_J:
205 /*
206 * Frame high, one word length for frame sync,
207 * frame sync asserts with the first bit of the frame.
208 */
209 val_cr2 |= FSL_SAI_CR2_BCP;
210 break;
211 case SND_SOC_DAIFMT_DSP_A:
212 /*
213 * Frame high, 1clk before data, one bit for frame sync,
214 * frame sync starts one serial clock cycle earlier,
215 * that is, together with the last bit of the previous
216 * data word.
217 */
218 val_cr2 |= FSL_SAI_CR2_BCP;
219 val_cr4 |= FSL_SAI_CR4_FSE;
220 sai->is_dsp_mode = true;
221 break;
222 case SND_SOC_DAIFMT_DSP_B:
223 /*
224 * Frame high, one bit for frame sync,
225 * frame sync asserts with the first bit of the frame.
226 */
227 val_cr2 |= FSL_SAI_CR2_BCP;
228 sai->is_dsp_mode = true;
229 break;
230 case SND_SOC_DAIFMT_RIGHT_J:
231 /* To be done */
232 default:
233 return -EINVAL;
234 }
235
236 /* DAI clock inversion */
237 switch (fmt & SND_SOC_DAIFMT_INV_MASK) {
238 case SND_SOC_DAIFMT_IB_IF:
239 /* Invert both clocks */
240 val_cr2 ^= FSL_SAI_CR2_BCP;
241 val_cr4 ^= FSL_SAI_CR4_FSP;
242 break;
243 case SND_SOC_DAIFMT_IB_NF:
244 /* Invert bit clock */
245 val_cr2 ^= FSL_SAI_CR2_BCP;
246 break;
247 case SND_SOC_DAIFMT_NB_IF:
248 /* Invert frame clock */
249 val_cr4 ^= FSL_SAI_CR4_FSP;
250 break;
251 case SND_SOC_DAIFMT_NB_NF:
252 /* Nothing to do for both normal cases */
253 break;
254 default:
255 return -EINVAL;
256 }
257
258 /* DAI clock master masks */
259 switch (fmt & SND_SOC_DAIFMT_MASTER_MASK) {
260 case SND_SOC_DAIFMT_CBS_CFS:
261 val_cr2 |= FSL_SAI_CR2_BCD_MSTR;
262 val_cr4 |= FSL_SAI_CR4_FSD_MSTR;
263 sai->is_slave_mode = false;
264 break;
265 case SND_SOC_DAIFMT_CBM_CFM:
266 sai->is_slave_mode = true;
267 break;
268 case SND_SOC_DAIFMT_CBS_CFM:
269 val_cr2 |= FSL_SAI_CR2_BCD_MSTR;
270 sai->is_slave_mode = false;
271 break;
272 case SND_SOC_DAIFMT_CBM_CFS:
273 val_cr4 |= FSL_SAI_CR4_FSD_MSTR;
274 sai->is_slave_mode = true;
275 break;
276 default:
277 return -EINVAL;
278 }
279
280 regmap_update_bits(sai->regmap, FSL_SAI_xCR2(tx),
281 FSL_SAI_CR2_BCP | FSL_SAI_CR2_BCD_MSTR, val_cr2);
282 regmap_update_bits(sai->regmap, FSL_SAI_xCR4(tx),
283 FSL_SAI_CR4_MF | FSL_SAI_CR4_FSE |
284 FSL_SAI_CR4_FSP | FSL_SAI_CR4_FSD_MSTR, val_cr4);
285
286 return 0;
287 }
288
fsl_sai_set_dai_fmt(struct snd_soc_dai * cpu_dai,unsigned int fmt)289 static int fsl_sai_set_dai_fmt(struct snd_soc_dai *cpu_dai, unsigned int fmt)
290 {
291 int ret;
292
293 ret = fsl_sai_set_dai_fmt_tr(cpu_dai, fmt, FSL_FMT_TRANSMITTER);
294 if (ret) {
295 dev_err(cpu_dai->dev, "Cannot set tx format: %d\n", ret);
296 return ret;
297 }
298
299 ret = fsl_sai_set_dai_fmt_tr(cpu_dai, fmt, FSL_FMT_RECEIVER);
300 if (ret)
301 dev_err(cpu_dai->dev, "Cannot set rx format: %d\n", ret);
302
303 return ret;
304 }
305
fsl_sai_set_bclk(struct snd_soc_dai * dai,bool tx,u32 freq)306 static int fsl_sai_set_bclk(struct snd_soc_dai *dai, bool tx, u32 freq)
307 {
308 struct fsl_sai *sai = snd_soc_dai_get_drvdata(dai);
309 unsigned long clk_rate;
310 u32 savediv = 0, ratio, savesub = freq;
311 u32 id;
312 int ret = 0;
313
314 /* Don't apply to slave mode */
315 if (sai->is_slave_mode)
316 return 0;
317
318 for (id = 0; id < FSL_SAI_MCLK_MAX; id++) {
319 clk_rate = clk_get_rate(sai->mclk_clk[id]);
320 if (!clk_rate)
321 continue;
322
323 ratio = clk_rate / freq;
324
325 ret = clk_rate - ratio * freq;
326
327 /*
328 * Drop the source that can not be
329 * divided into the required rate.
330 */
331 if (ret != 0 && clk_rate / ret < 1000)
332 continue;
333
334 dev_dbg(dai->dev,
335 "ratio %d for freq %dHz based on clock %ldHz\n",
336 ratio, freq, clk_rate);
337
338 if (ratio % 2 == 0 && ratio >= 2 && ratio <= 512)
339 ratio /= 2;
340 else
341 continue;
342
343 if (ret < savesub) {
344 savediv = ratio;
345 sai->mclk_id[tx] = id;
346 savesub = ret;
347 }
348
349 if (ret == 0)
350 break;
351 }
352
353 if (savediv == 0) {
354 dev_err(dai->dev, "failed to derive required %cx rate: %d\n",
355 tx ? 'T' : 'R', freq);
356 return -EINVAL;
357 }
358
359 if ((tx && sai->synchronous[TX]) || (!tx && !sai->synchronous[RX])) {
360 regmap_update_bits(sai->regmap, FSL_SAI_RCR2,
361 FSL_SAI_CR2_MSEL_MASK,
362 FSL_SAI_CR2_MSEL(sai->mclk_id[tx]));
363 regmap_update_bits(sai->regmap, FSL_SAI_RCR2,
364 FSL_SAI_CR2_DIV_MASK, savediv - 1);
365 } else {
366 regmap_update_bits(sai->regmap, FSL_SAI_TCR2,
367 FSL_SAI_CR2_MSEL_MASK,
368 FSL_SAI_CR2_MSEL(sai->mclk_id[tx]));
369 regmap_update_bits(sai->regmap, FSL_SAI_TCR2,
370 FSL_SAI_CR2_DIV_MASK, savediv - 1);
371 }
372
373 dev_dbg(dai->dev, "best fit: clock id=%d, div=%d, deviation =%d\n",
374 sai->mclk_id[tx], savediv, savesub);
375
376 return 0;
377 }
378
fsl_sai_hw_params(struct snd_pcm_substream * substream,struct snd_pcm_hw_params * params,struct snd_soc_dai * cpu_dai)379 static int fsl_sai_hw_params(struct snd_pcm_substream *substream,
380 struct snd_pcm_hw_params *params,
381 struct snd_soc_dai *cpu_dai)
382 {
383 struct fsl_sai *sai = snd_soc_dai_get_drvdata(cpu_dai);
384 bool tx = substream->stream == SNDRV_PCM_STREAM_PLAYBACK;
385 unsigned int channels = params_channels(params);
386 u32 word_width = snd_pcm_format_width(params_format(params));
387 u32 val_cr4 = 0, val_cr5 = 0;
388 int ret;
389
390 if (!sai->is_slave_mode) {
391 ret = fsl_sai_set_bclk(cpu_dai, tx,
392 2 * word_width * params_rate(params));
393 if (ret)
394 return ret;
395
396 /* Do not enable the clock if it is already enabled */
397 if (!(sai->mclk_streams & BIT(substream->stream))) {
398 ret = clk_prepare_enable(sai->mclk_clk[sai->mclk_id[tx]]);
399 if (ret)
400 return ret;
401
402 sai->mclk_streams |= BIT(substream->stream);
403 }
404
405 }
406
407 if (!sai->is_dsp_mode)
408 val_cr4 |= FSL_SAI_CR4_SYWD(word_width);
409
410 val_cr5 |= FSL_SAI_CR5_WNW(word_width);
411 val_cr5 |= FSL_SAI_CR5_W0W(word_width);
412
413 if (sai->is_lsb_first)
414 val_cr5 |= FSL_SAI_CR5_FBT(0);
415 else
416 val_cr5 |= FSL_SAI_CR5_FBT(word_width - 1);
417
418 val_cr4 |= FSL_SAI_CR4_FRSZ(channels);
419
420 regmap_update_bits(sai->regmap, FSL_SAI_xCR4(tx),
421 FSL_SAI_CR4_SYWD_MASK | FSL_SAI_CR4_FRSZ_MASK,
422 val_cr4);
423 regmap_update_bits(sai->regmap, FSL_SAI_xCR5(tx),
424 FSL_SAI_CR5_WNW_MASK | FSL_SAI_CR5_W0W_MASK |
425 FSL_SAI_CR5_FBT_MASK, val_cr5);
426 regmap_write(sai->regmap, FSL_SAI_xMR(tx), ~0UL - ((1 << channels) - 1));
427
428 return 0;
429 }
430
fsl_sai_hw_free(struct snd_pcm_substream * substream,struct snd_soc_dai * cpu_dai)431 static int fsl_sai_hw_free(struct snd_pcm_substream *substream,
432 struct snd_soc_dai *cpu_dai)
433 {
434 struct fsl_sai *sai = snd_soc_dai_get_drvdata(cpu_dai);
435 bool tx = substream->stream == SNDRV_PCM_STREAM_PLAYBACK;
436
437 if (!sai->is_slave_mode &&
438 sai->mclk_streams & BIT(substream->stream)) {
439 clk_disable_unprepare(sai->mclk_clk[sai->mclk_id[tx]]);
440 sai->mclk_streams &= ~BIT(substream->stream);
441 }
442
443 return 0;
444 }
445
446
fsl_sai_trigger(struct snd_pcm_substream * substream,int cmd,struct snd_soc_dai * cpu_dai)447 static int fsl_sai_trigger(struct snd_pcm_substream *substream, int cmd,
448 struct snd_soc_dai *cpu_dai)
449 {
450 struct fsl_sai *sai = snd_soc_dai_get_drvdata(cpu_dai);
451 bool tx = substream->stream == SNDRV_PCM_STREAM_PLAYBACK;
452 u32 xcsr, count = 100;
453
454 /*
455 * Asynchronous mode: Clear SYNC for both Tx and Rx.
456 * Rx sync with Tx clocks: Clear SYNC for Tx, set it for Rx.
457 * Tx sync with Rx clocks: Clear SYNC for Rx, set it for Tx.
458 */
459 regmap_update_bits(sai->regmap, FSL_SAI_TCR2, FSL_SAI_CR2_SYNC,
460 sai->synchronous[TX] ? FSL_SAI_CR2_SYNC : 0);
461 regmap_update_bits(sai->regmap, FSL_SAI_RCR2, FSL_SAI_CR2_SYNC,
462 sai->synchronous[RX] ? FSL_SAI_CR2_SYNC : 0);
463
464 /*
465 * It is recommended that the transmitter is the last enabled
466 * and the first disabled.
467 */
468 switch (cmd) {
469 case SNDRV_PCM_TRIGGER_START:
470 case SNDRV_PCM_TRIGGER_RESUME:
471 case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
472 regmap_update_bits(sai->regmap, FSL_SAI_xCSR(tx),
473 FSL_SAI_CSR_FRDE, FSL_SAI_CSR_FRDE);
474
475 regmap_update_bits(sai->regmap, FSL_SAI_RCSR,
476 FSL_SAI_CSR_TERE, FSL_SAI_CSR_TERE);
477 regmap_update_bits(sai->regmap, FSL_SAI_TCSR,
478 FSL_SAI_CSR_TERE, FSL_SAI_CSR_TERE);
479
480 regmap_update_bits(sai->regmap, FSL_SAI_xCSR(tx),
481 FSL_SAI_CSR_xIE_MASK, FSL_SAI_FLAGS);
482 break;
483 case SNDRV_PCM_TRIGGER_STOP:
484 case SNDRV_PCM_TRIGGER_SUSPEND:
485 case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
486 regmap_update_bits(sai->regmap, FSL_SAI_xCSR(tx),
487 FSL_SAI_CSR_FRDE, 0);
488 regmap_update_bits(sai->regmap, FSL_SAI_xCSR(tx),
489 FSL_SAI_CSR_xIE_MASK, 0);
490
491 /* Check if the opposite FRDE is also disabled */
492 regmap_read(sai->regmap, FSL_SAI_xCSR(!tx), &xcsr);
493 if (!(xcsr & FSL_SAI_CSR_FRDE)) {
494 /* Disable both directions and reset their FIFOs */
495 regmap_update_bits(sai->regmap, FSL_SAI_TCSR,
496 FSL_SAI_CSR_TERE, 0);
497 regmap_update_bits(sai->regmap, FSL_SAI_RCSR,
498 FSL_SAI_CSR_TERE, 0);
499
500 /* TERE will remain set till the end of current frame */
501 do {
502 udelay(10);
503 regmap_read(sai->regmap, FSL_SAI_xCSR(tx), &xcsr);
504 } while (--count && xcsr & FSL_SAI_CSR_TERE);
505
506 regmap_update_bits(sai->regmap, FSL_SAI_TCSR,
507 FSL_SAI_CSR_FR, FSL_SAI_CSR_FR);
508 regmap_update_bits(sai->regmap, FSL_SAI_RCSR,
509 FSL_SAI_CSR_FR, FSL_SAI_CSR_FR);
510
511 /*
512 * For sai master mode, after several open/close sai,
513 * there will be no frame clock, and can't recover
514 * anymore. Add software reset to fix this issue.
515 * This is a hardware bug, and will be fix in the
516 * next sai version.
517 */
518 if (!sai->is_slave_mode) {
519 /* Software Reset for both Tx and Rx */
520 regmap_write(sai->regmap,
521 FSL_SAI_TCSR, FSL_SAI_CSR_SR);
522 regmap_write(sai->regmap,
523 FSL_SAI_RCSR, FSL_SAI_CSR_SR);
524 /* Clear SR bit to finish the reset */
525 regmap_write(sai->regmap, FSL_SAI_TCSR, 0);
526 regmap_write(sai->regmap, FSL_SAI_RCSR, 0);
527 }
528 }
529 break;
530 default:
531 return -EINVAL;
532 }
533
534 return 0;
535 }
536
fsl_sai_startup(struct snd_pcm_substream * substream,struct snd_soc_dai * cpu_dai)537 static int fsl_sai_startup(struct snd_pcm_substream *substream,
538 struct snd_soc_dai *cpu_dai)
539 {
540 struct fsl_sai *sai = snd_soc_dai_get_drvdata(cpu_dai);
541 bool tx = substream->stream == SNDRV_PCM_STREAM_PLAYBACK;
542 struct device *dev = &sai->pdev->dev;
543 int ret;
544
545 ret = clk_prepare_enable(sai->bus_clk);
546 if (ret) {
547 dev_err(dev, "failed to enable bus clock: %d\n", ret);
548 return ret;
549 }
550
551 regmap_update_bits(sai->regmap, FSL_SAI_xCR3(tx), FSL_SAI_CR3_TRCE,
552 FSL_SAI_CR3_TRCE);
553
554 ret = snd_pcm_hw_constraint_list(substream->runtime, 0,
555 SNDRV_PCM_HW_PARAM_RATE, &fsl_sai_rate_constraints);
556
557 return ret;
558 }
559
fsl_sai_shutdown(struct snd_pcm_substream * substream,struct snd_soc_dai * cpu_dai)560 static void fsl_sai_shutdown(struct snd_pcm_substream *substream,
561 struct snd_soc_dai *cpu_dai)
562 {
563 struct fsl_sai *sai = snd_soc_dai_get_drvdata(cpu_dai);
564 bool tx = substream->stream == SNDRV_PCM_STREAM_PLAYBACK;
565
566 regmap_update_bits(sai->regmap, FSL_SAI_xCR3(tx), FSL_SAI_CR3_TRCE, 0);
567
568 clk_disable_unprepare(sai->bus_clk);
569 }
570
571 static const struct snd_soc_dai_ops fsl_sai_pcm_dai_ops = {
572 .set_sysclk = fsl_sai_set_dai_sysclk,
573 .set_fmt = fsl_sai_set_dai_fmt,
574 .hw_params = fsl_sai_hw_params,
575 .hw_free = fsl_sai_hw_free,
576 .trigger = fsl_sai_trigger,
577 .startup = fsl_sai_startup,
578 .shutdown = fsl_sai_shutdown,
579 };
580
fsl_sai_dai_probe(struct snd_soc_dai * cpu_dai)581 static int fsl_sai_dai_probe(struct snd_soc_dai *cpu_dai)
582 {
583 struct fsl_sai *sai = dev_get_drvdata(cpu_dai->dev);
584
585 /* Software Reset for both Tx and Rx */
586 regmap_write(sai->regmap, FSL_SAI_TCSR, FSL_SAI_CSR_SR);
587 regmap_write(sai->regmap, FSL_SAI_RCSR, FSL_SAI_CSR_SR);
588 /* Clear SR bit to finish the reset */
589 regmap_write(sai->regmap, FSL_SAI_TCSR, 0);
590 regmap_write(sai->regmap, FSL_SAI_RCSR, 0);
591
592 regmap_update_bits(sai->regmap, FSL_SAI_TCR1, FSL_SAI_CR1_RFW_MASK,
593 FSL_SAI_MAXBURST_TX * 2);
594 regmap_update_bits(sai->regmap, FSL_SAI_RCR1, FSL_SAI_CR1_RFW_MASK,
595 FSL_SAI_MAXBURST_RX - 1);
596
597 snd_soc_dai_init_dma_data(cpu_dai, &sai->dma_params_tx,
598 &sai->dma_params_rx);
599
600 snd_soc_dai_set_drvdata(cpu_dai, sai);
601
602 return 0;
603 }
604
605 static struct snd_soc_dai_driver fsl_sai_dai = {
606 .probe = fsl_sai_dai_probe,
607 .playback = {
608 .stream_name = "CPU-Playback",
609 .channels_min = 1,
610 .channels_max = 2,
611 .rate_min = 8000,
612 .rate_max = 192000,
613 .rates = SNDRV_PCM_RATE_KNOT,
614 .formats = FSL_SAI_FORMATS,
615 },
616 .capture = {
617 .stream_name = "CPU-Capture",
618 .channels_min = 1,
619 .channels_max = 2,
620 .rate_min = 8000,
621 .rate_max = 192000,
622 .rates = SNDRV_PCM_RATE_KNOT,
623 .formats = FSL_SAI_FORMATS,
624 },
625 .ops = &fsl_sai_pcm_dai_ops,
626 };
627
628 static const struct snd_soc_component_driver fsl_component = {
629 .name = "fsl-sai",
630 };
631
fsl_sai_readable_reg(struct device * dev,unsigned int reg)632 static bool fsl_sai_readable_reg(struct device *dev, unsigned int reg)
633 {
634 switch (reg) {
635 case FSL_SAI_TCSR:
636 case FSL_SAI_TCR1:
637 case FSL_SAI_TCR2:
638 case FSL_SAI_TCR3:
639 case FSL_SAI_TCR4:
640 case FSL_SAI_TCR5:
641 case FSL_SAI_TFR:
642 case FSL_SAI_TMR:
643 case FSL_SAI_RCSR:
644 case FSL_SAI_RCR1:
645 case FSL_SAI_RCR2:
646 case FSL_SAI_RCR3:
647 case FSL_SAI_RCR4:
648 case FSL_SAI_RCR5:
649 case FSL_SAI_RDR:
650 case FSL_SAI_RFR:
651 case FSL_SAI_RMR:
652 return true;
653 default:
654 return false;
655 }
656 }
657
fsl_sai_volatile_reg(struct device * dev,unsigned int reg)658 static bool fsl_sai_volatile_reg(struct device *dev, unsigned int reg)
659 {
660 switch (reg) {
661 case FSL_SAI_TCSR:
662 case FSL_SAI_RCSR:
663 case FSL_SAI_TFR:
664 case FSL_SAI_RFR:
665 case FSL_SAI_TDR:
666 case FSL_SAI_RDR:
667 return true;
668 default:
669 return false;
670 }
671
672 }
673
fsl_sai_writeable_reg(struct device * dev,unsigned int reg)674 static bool fsl_sai_writeable_reg(struct device *dev, unsigned int reg)
675 {
676 switch (reg) {
677 case FSL_SAI_TCSR:
678 case FSL_SAI_TCR1:
679 case FSL_SAI_TCR2:
680 case FSL_SAI_TCR3:
681 case FSL_SAI_TCR4:
682 case FSL_SAI_TCR5:
683 case FSL_SAI_TDR:
684 case FSL_SAI_TMR:
685 case FSL_SAI_RCSR:
686 case FSL_SAI_RCR1:
687 case FSL_SAI_RCR2:
688 case FSL_SAI_RCR3:
689 case FSL_SAI_RCR4:
690 case FSL_SAI_RCR5:
691 case FSL_SAI_RMR:
692 return true;
693 default:
694 return false;
695 }
696 }
697
698 static const struct regmap_config fsl_sai_regmap_config = {
699 .reg_bits = 32,
700 .reg_stride = 4,
701 .val_bits = 32,
702
703 .max_register = FSL_SAI_RMR,
704 .readable_reg = fsl_sai_readable_reg,
705 .volatile_reg = fsl_sai_volatile_reg,
706 .writeable_reg = fsl_sai_writeable_reg,
707 .cache_type = REGCACHE_FLAT,
708 };
709
fsl_sai_probe(struct platform_device * pdev)710 static int fsl_sai_probe(struct platform_device *pdev)
711 {
712 struct device_node *np = pdev->dev.of_node;
713 struct fsl_sai *sai;
714 struct resource *res;
715 void __iomem *base;
716 char tmp[8];
717 int irq, ret, i;
718
719 sai = devm_kzalloc(&pdev->dev, sizeof(*sai), GFP_KERNEL);
720 if (!sai)
721 return -ENOMEM;
722
723 sai->pdev = pdev;
724
725 if (of_device_is_compatible(pdev->dev.of_node, "fsl,imx6sx-sai"))
726 sai->sai_on_imx = true;
727
728 sai->is_lsb_first = of_property_read_bool(np, "lsb-first");
729
730 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
731 base = devm_ioremap_resource(&pdev->dev, res);
732 if (IS_ERR(base))
733 return PTR_ERR(base);
734
735 sai->regmap = devm_regmap_init_mmio_clk(&pdev->dev,
736 "bus", base, &fsl_sai_regmap_config);
737
738 /* Compatible with old DTB cases */
739 if (IS_ERR(sai->regmap))
740 sai->regmap = devm_regmap_init_mmio_clk(&pdev->dev,
741 "sai", base, &fsl_sai_regmap_config);
742 if (IS_ERR(sai->regmap)) {
743 dev_err(&pdev->dev, "regmap init failed\n");
744 return PTR_ERR(sai->regmap);
745 }
746
747 /* No error out for old DTB cases but only mark the clock NULL */
748 sai->bus_clk = devm_clk_get(&pdev->dev, "bus");
749 if (IS_ERR(sai->bus_clk)) {
750 dev_err(&pdev->dev, "failed to get bus clock: %ld\n",
751 PTR_ERR(sai->bus_clk));
752 sai->bus_clk = NULL;
753 }
754
755 sai->mclk_clk[0] = sai->bus_clk;
756 for (i = 1; i < FSL_SAI_MCLK_MAX; i++) {
757 sprintf(tmp, "mclk%d", i);
758 sai->mclk_clk[i] = devm_clk_get(&pdev->dev, tmp);
759 if (IS_ERR(sai->mclk_clk[i])) {
760 dev_err(&pdev->dev, "failed to get mclk%d clock: %ld\n",
761 i + 1, PTR_ERR(sai->mclk_clk[i]));
762 sai->mclk_clk[i] = NULL;
763 }
764 }
765
766 irq = platform_get_irq(pdev, 0);
767 if (irq < 0) {
768 dev_err(&pdev->dev, "no irq for node %s\n", pdev->name);
769 return irq;
770 }
771
772 ret = devm_request_irq(&pdev->dev, irq, fsl_sai_isr, 0, np->name, sai);
773 if (ret) {
774 dev_err(&pdev->dev, "failed to claim irq %u\n", irq);
775 return ret;
776 }
777
778 /* Sync Tx with Rx as default by following old DT binding */
779 sai->synchronous[RX] = true;
780 sai->synchronous[TX] = false;
781 fsl_sai_dai.symmetric_rates = 1;
782 fsl_sai_dai.symmetric_channels = 1;
783 fsl_sai_dai.symmetric_samplebits = 1;
784
785 if (of_find_property(np, "fsl,sai-synchronous-rx", NULL) &&
786 of_find_property(np, "fsl,sai-asynchronous", NULL)) {
787 /* error out if both synchronous and asynchronous are present */
788 dev_err(&pdev->dev, "invalid binding for synchronous mode\n");
789 return -EINVAL;
790 }
791
792 if (of_find_property(np, "fsl,sai-synchronous-rx", NULL)) {
793 /* Sync Rx with Tx */
794 sai->synchronous[RX] = false;
795 sai->synchronous[TX] = true;
796 } else if (of_find_property(np, "fsl,sai-asynchronous", NULL)) {
797 /* Discard all settings for asynchronous mode */
798 sai->synchronous[RX] = false;
799 sai->synchronous[TX] = false;
800 fsl_sai_dai.symmetric_rates = 0;
801 fsl_sai_dai.symmetric_channels = 0;
802 fsl_sai_dai.symmetric_samplebits = 0;
803 }
804
805 sai->dma_params_rx.addr = res->start + FSL_SAI_RDR;
806 sai->dma_params_tx.addr = res->start + FSL_SAI_TDR;
807 sai->dma_params_rx.maxburst = FSL_SAI_MAXBURST_RX;
808 sai->dma_params_tx.maxburst = FSL_SAI_MAXBURST_TX;
809
810 platform_set_drvdata(pdev, sai);
811
812 ret = devm_snd_soc_register_component(&pdev->dev, &fsl_component,
813 &fsl_sai_dai, 1);
814 if (ret)
815 return ret;
816
817 if (sai->sai_on_imx)
818 return imx_pcm_dma_init(pdev, IMX_SAI_DMABUF_SIZE);
819 else
820 return devm_snd_dmaengine_pcm_register(&pdev->dev, NULL, 0);
821 }
822
823 static const struct of_device_id fsl_sai_ids[] = {
824 { .compatible = "fsl,vf610-sai", },
825 { .compatible = "fsl,imx6sx-sai", },
826 { /* sentinel */ }
827 };
828 MODULE_DEVICE_TABLE(of, fsl_sai_ids);
829
830 #ifdef CONFIG_PM_SLEEP
fsl_sai_suspend(struct device * dev)831 static int fsl_sai_suspend(struct device *dev)
832 {
833 struct fsl_sai *sai = dev_get_drvdata(dev);
834
835 regcache_cache_only(sai->regmap, true);
836 regcache_mark_dirty(sai->regmap);
837
838 return 0;
839 }
840
fsl_sai_resume(struct device * dev)841 static int fsl_sai_resume(struct device *dev)
842 {
843 struct fsl_sai *sai = dev_get_drvdata(dev);
844
845 regcache_cache_only(sai->regmap, false);
846 regmap_write(sai->regmap, FSL_SAI_TCSR, FSL_SAI_CSR_SR);
847 regmap_write(sai->regmap, FSL_SAI_RCSR, FSL_SAI_CSR_SR);
848 msleep(1);
849 regmap_write(sai->regmap, FSL_SAI_TCSR, 0);
850 regmap_write(sai->regmap, FSL_SAI_RCSR, 0);
851 return regcache_sync(sai->regmap);
852 }
853 #endif /* CONFIG_PM_SLEEP */
854
855 static const struct dev_pm_ops fsl_sai_pm_ops = {
856 SET_SYSTEM_SLEEP_PM_OPS(fsl_sai_suspend, fsl_sai_resume)
857 };
858
859 static struct platform_driver fsl_sai_driver = {
860 .probe = fsl_sai_probe,
861 .driver = {
862 .name = "fsl-sai",
863 .pm = &fsl_sai_pm_ops,
864 .of_match_table = fsl_sai_ids,
865 },
866 };
867 module_platform_driver(fsl_sai_driver);
868
869 MODULE_DESCRIPTION("Freescale Soc SAI Interface");
870 MODULE_AUTHOR("Xiubo Li, <Li.Xiubo@freescale.com>");
871 MODULE_ALIAS("platform:fsl-sai");
872 MODULE_LICENSE("GPL");
873