2 * Freescale ALSA SoC Digital Audio Interface (SAI) driver.
4 * Copyright 2012-2015 Freescale Semiconductor, Inc.
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.
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 <linux/time.h>
21 #include <sound/core.h>
22 #include <sound/dmaengine_pcm.h>
23 #include <sound/pcm_params.h>
24 #include <linux/mfd/syscon.h>
25 #include <linux/mfd/syscon/imx6q-iomuxc-gpr.h>
30 #define FSL_SAI_FLAGS (FSL_SAI_CSR_SEIE |\
33 static const unsigned int fsl_sai_rates[] = {
34 8000, 11025, 12000, 16000, 22050,
35 24000, 32000, 44100, 48000, 64000,
36 88200, 96000, 176400, 192000
39 static const struct snd_pcm_hw_constraint_list fsl_sai_rate_constraints = {
40 .count = ARRAY_SIZE(fsl_sai_rates),
41 .list = fsl_sai_rates,
44 static irqreturn_t fsl_sai_isr(int irq, void *devid)
46 struct fsl_sai *sai = (struct fsl_sai *)devid;
47 struct device *dev = &sai->pdev->dev;
48 u32 flags, xcsr, mask;
52 * Both IRQ status bits and IRQ mask bits are in the xCSR but
53 * different shifts. And we here create a mask only for those
54 * IRQs that we activated.
56 mask = (FSL_SAI_FLAGS >> FSL_SAI_CSR_xIE_SHIFT) << FSL_SAI_CSR_xF_SHIFT;
59 regmap_read(sai->regmap, FSL_SAI_TCSR, &xcsr);
67 if (flags & FSL_SAI_CSR_WSF)
68 dev_dbg(dev, "isr: Start of Tx word detected\n");
70 if (flags & FSL_SAI_CSR_SEF)
71 dev_warn(dev, "isr: Tx Frame sync error detected\n");
73 if (flags & FSL_SAI_CSR_FEF) {
74 dev_warn(dev, "isr: Transmit underrun detected\n");
75 /* FIFO reset for safety */
76 xcsr |= FSL_SAI_CSR_FR;
79 if (flags & FSL_SAI_CSR_FWF)
80 dev_dbg(dev, "isr: Enabled transmit FIFO is empty\n");
82 if (flags & FSL_SAI_CSR_FRF)
83 dev_dbg(dev, "isr: Transmit FIFO watermark has been reached\n");
85 flags &= FSL_SAI_CSR_xF_W_MASK;
86 xcsr &= ~FSL_SAI_CSR_xF_MASK;
89 regmap_write(sai->regmap, FSL_SAI_TCSR, flags | xcsr);
93 regmap_read(sai->regmap, FSL_SAI_RCSR, &xcsr);
101 if (flags & FSL_SAI_CSR_WSF)
102 dev_dbg(dev, "isr: Start of Rx word detected\n");
104 if (flags & FSL_SAI_CSR_SEF)
105 dev_warn(dev, "isr: Rx Frame sync error detected\n");
107 if (flags & FSL_SAI_CSR_FEF) {
108 dev_warn(dev, "isr: Receive overflow detected\n");
109 /* FIFO reset for safety */
110 xcsr |= FSL_SAI_CSR_FR;
113 if (flags & FSL_SAI_CSR_FWF)
114 dev_dbg(dev, "isr: Enabled receive FIFO is full\n");
116 if (flags & FSL_SAI_CSR_FRF)
117 dev_dbg(dev, "isr: Receive FIFO watermark has been reached\n");
119 flags &= FSL_SAI_CSR_xF_W_MASK;
120 xcsr &= ~FSL_SAI_CSR_xF_MASK;
123 regmap_write(sai->regmap, FSL_SAI_RCSR, flags | xcsr);
132 static int fsl_sai_set_dai_tdm_slot(struct snd_soc_dai *cpu_dai, u32 tx_mask,
133 u32 rx_mask, int slots, int slot_width)
135 struct fsl_sai *sai = snd_soc_dai_get_drvdata(cpu_dai);
138 sai->slot_width = slot_width;
143 static int fsl_sai_set_dai_sysclk_tr(struct snd_soc_dai *cpu_dai,
144 int clk_id, unsigned int freq, int fsl_dir)
146 struct fsl_sai *sai = snd_soc_dai_get_drvdata(cpu_dai);
147 bool tx = fsl_dir == FSL_FMT_TRANSMITTER;
151 case FSL_SAI_CLK_BUS:
152 val_cr2 |= FSL_SAI_CR2_MSEL_BUS;
154 case FSL_SAI_CLK_MAST1:
155 val_cr2 |= FSL_SAI_CR2_MSEL_MCLK1;
157 case FSL_SAI_CLK_MAST2:
158 val_cr2 |= FSL_SAI_CR2_MSEL_MCLK2;
160 case FSL_SAI_CLK_MAST3:
161 val_cr2 |= FSL_SAI_CR2_MSEL_MCLK3;
167 regmap_update_bits(sai->regmap, FSL_SAI_xCR2(tx),
168 FSL_SAI_CR2_MSEL_MASK, val_cr2);
173 static int fsl_sai_set_dai_sysclk(struct snd_soc_dai *cpu_dai,
174 int clk_id, unsigned int freq, int dir)
178 if (dir == SND_SOC_CLOCK_IN)
181 ret = fsl_sai_set_dai_sysclk_tr(cpu_dai, clk_id, freq,
182 FSL_FMT_TRANSMITTER);
184 dev_err(cpu_dai->dev, "Cannot set tx sysclk: %d\n", ret);
188 ret = fsl_sai_set_dai_sysclk_tr(cpu_dai, clk_id, freq,
191 dev_err(cpu_dai->dev, "Cannot set rx sysclk: %d\n", ret);
196 static int fsl_sai_set_dai_fmt_tr(struct snd_soc_dai *cpu_dai,
197 unsigned int fmt, int fsl_dir)
199 struct fsl_sai *sai = snd_soc_dai_get_drvdata(cpu_dai);
200 bool tx = fsl_dir == FSL_FMT_TRANSMITTER;
201 u32 val_cr2 = 0, val_cr4 = 0;
203 if (!sai->is_lsb_first)
204 val_cr4 |= FSL_SAI_CR4_MF;
207 switch (fmt & SND_SOC_DAIFMT_FORMAT_MASK) {
208 case SND_SOC_DAIFMT_I2S:
210 * Frame low, 1clk before data, one word length for frame sync,
211 * frame sync starts one serial clock cycle earlier,
212 * that is, together with the last bit of the previous
215 val_cr2 |= FSL_SAI_CR2_BCP;
216 val_cr4 |= FSL_SAI_CR4_FSE | FSL_SAI_CR4_FSP;
218 case SND_SOC_DAIFMT_LEFT_J:
220 * Frame high, one word length for frame sync,
221 * frame sync asserts with the first bit of the frame.
223 val_cr2 |= FSL_SAI_CR2_BCP;
225 case SND_SOC_DAIFMT_DSP_A:
227 * Frame high, 1clk before data, one bit for frame sync,
228 * frame sync starts one serial clock cycle earlier,
229 * that is, together with the last bit of the previous
232 val_cr2 |= FSL_SAI_CR2_BCP;
233 val_cr4 |= FSL_SAI_CR4_FSE;
234 sai->is_dsp_mode = true;
236 case SND_SOC_DAIFMT_DSP_B:
238 * Frame high, one bit for frame sync,
239 * frame sync asserts with the first bit of the frame.
241 val_cr2 |= FSL_SAI_CR2_BCP;
242 sai->is_dsp_mode = true;
244 case SND_SOC_DAIFMT_RIGHT_J:
250 /* DAI clock inversion */
251 switch (fmt & SND_SOC_DAIFMT_INV_MASK) {
252 case SND_SOC_DAIFMT_IB_IF:
253 /* Invert both clocks */
254 val_cr2 ^= FSL_SAI_CR2_BCP;
255 val_cr4 ^= FSL_SAI_CR4_FSP;
257 case SND_SOC_DAIFMT_IB_NF:
258 /* Invert bit clock */
259 val_cr2 ^= FSL_SAI_CR2_BCP;
261 case SND_SOC_DAIFMT_NB_IF:
262 /* Invert frame clock */
263 val_cr4 ^= FSL_SAI_CR4_FSP;
265 case SND_SOC_DAIFMT_NB_NF:
266 /* Nothing to do for both normal cases */
272 /* DAI clock master masks */
273 switch (fmt & SND_SOC_DAIFMT_MASTER_MASK) {
274 case SND_SOC_DAIFMT_CBS_CFS:
275 val_cr2 |= FSL_SAI_CR2_BCD_MSTR;
276 val_cr4 |= FSL_SAI_CR4_FSD_MSTR;
278 case SND_SOC_DAIFMT_CBM_CFM:
279 sai->is_slave_mode = true;
281 case SND_SOC_DAIFMT_CBS_CFM:
282 val_cr2 |= FSL_SAI_CR2_BCD_MSTR;
284 case SND_SOC_DAIFMT_CBM_CFS:
285 val_cr4 |= FSL_SAI_CR4_FSD_MSTR;
286 sai->is_slave_mode = true;
292 regmap_update_bits(sai->regmap, FSL_SAI_xCR2(tx),
293 FSL_SAI_CR2_BCP | FSL_SAI_CR2_BCD_MSTR, val_cr2);
294 regmap_update_bits(sai->regmap, FSL_SAI_xCR4(tx),
295 FSL_SAI_CR4_MF | FSL_SAI_CR4_FSE |
296 FSL_SAI_CR4_FSP | FSL_SAI_CR4_FSD_MSTR, val_cr4);
301 static int fsl_sai_set_dai_fmt(struct snd_soc_dai *cpu_dai, unsigned int fmt)
305 ret = fsl_sai_set_dai_fmt_tr(cpu_dai, fmt, FSL_FMT_TRANSMITTER);
307 dev_err(cpu_dai->dev, "Cannot set tx format: %d\n", ret);
311 ret = fsl_sai_set_dai_fmt_tr(cpu_dai, fmt, FSL_FMT_RECEIVER);
313 dev_err(cpu_dai->dev, "Cannot set rx format: %d\n", ret);
318 static int fsl_sai_set_bclk(struct snd_soc_dai *dai, bool tx, u32 freq)
320 struct fsl_sai *sai = snd_soc_dai_get_drvdata(dai);
321 unsigned long clk_rate;
322 u32 savediv = 0, ratio, savesub = freq;
326 /* Don't apply to slave mode */
327 if (sai->is_slave_mode)
330 for (id = 0; id < FSL_SAI_MCLK_MAX; id++) {
331 clk_rate = clk_get_rate(sai->mclk_clk[id]);
335 ratio = clk_rate / freq;
337 ret = clk_rate - ratio * freq;
340 * Drop the source that can not be
341 * divided into the required rate.
343 if (ret != 0 && clk_rate / ret < 1000)
347 "ratio %d for freq %dHz based on clock %ldHz\n",
348 ratio, freq, clk_rate);
350 if (ratio % 2 == 0 && ratio >= 2 && ratio <= 512)
357 sai->mclk_id[tx] = id;
366 dev_err(dai->dev, "failed to derive required %cx rate: %d\n",
367 tx ? 'T' : 'R', freq);
372 * 1) For Asynchronous mode, we must set RCR2 register for capture, and
373 * set TCR2 register for playback.
374 * 2) For Tx sync with Rx clock, we must set RCR2 register for playback
376 * 3) For Rx sync with Tx clock, we must set TCR2 register for playback
378 * 4) For Tx and Rx are both Synchronous with another SAI, we just
381 if ((sai->synchronous[TX] && !sai->synchronous[RX]) ||
382 (!tx && !sai->synchronous[RX])) {
383 regmap_update_bits(sai->regmap, FSL_SAI_RCR2,
384 FSL_SAI_CR2_MSEL_MASK,
385 FSL_SAI_CR2_MSEL(sai->mclk_id[tx]));
386 regmap_update_bits(sai->regmap, FSL_SAI_RCR2,
387 FSL_SAI_CR2_DIV_MASK, savediv - 1);
388 } else if ((sai->synchronous[RX] && !sai->synchronous[TX]) ||
389 (tx && !sai->synchronous[TX])) {
390 regmap_update_bits(sai->regmap, FSL_SAI_TCR2,
391 FSL_SAI_CR2_MSEL_MASK,
392 FSL_SAI_CR2_MSEL(sai->mclk_id[tx]));
393 regmap_update_bits(sai->regmap, FSL_SAI_TCR2,
394 FSL_SAI_CR2_DIV_MASK, savediv - 1);
397 dev_dbg(dai->dev, "best fit: clock id=%d, div=%d, deviation =%d\n",
398 sai->mclk_id[tx], savediv, savesub);
403 static int fsl_sai_hw_params(struct snd_pcm_substream *substream,
404 struct snd_pcm_hw_params *params,
405 struct snd_soc_dai *cpu_dai)
407 struct fsl_sai *sai = snd_soc_dai_get_drvdata(cpu_dai);
408 bool tx = substream->stream == SNDRV_PCM_STREAM_PLAYBACK;
409 unsigned int channels = params_channels(params);
410 u32 word_width = params_width(params);
411 u32 val_cr4 = 0, val_cr5 = 0;
412 u32 slots = (channels == 1) ? 2 : channels;
413 u32 slot_width = word_width;
420 slot_width = sai->slot_width;
422 if (!sai->is_slave_mode) {
423 ret = fsl_sai_set_bclk(cpu_dai, tx,
424 slots * slot_width * params_rate(params));
428 /* Do not enable the clock if it is already enabled */
429 if (!(sai->mclk_streams & BIT(substream->stream))) {
430 ret = clk_prepare_enable(sai->mclk_clk[sai->mclk_id[tx]]);
434 sai->mclk_streams |= BIT(substream->stream);
438 if (!sai->is_dsp_mode)
439 val_cr4 |= FSL_SAI_CR4_SYWD(slot_width);
441 val_cr5 |= FSL_SAI_CR5_WNW(slot_width);
442 val_cr5 |= FSL_SAI_CR5_W0W(slot_width);
444 if (sai->is_lsb_first)
445 val_cr5 |= FSL_SAI_CR5_FBT(0);
447 val_cr5 |= FSL_SAI_CR5_FBT(word_width - 1);
449 val_cr4 |= FSL_SAI_CR4_FRSZ(slots);
452 * For SAI master mode, when Tx(Rx) sync with Rx(Tx) clock, Rx(Tx) will
453 * generate bclk and frame clock for Tx(Rx), we should set RCR4(TCR4),
454 * RCR5(TCR5) and RMR(TMR) for playback(capture), or there will be sync
458 if (!sai->is_slave_mode) {
459 if (!sai->synchronous[TX] && sai->synchronous[RX] && !tx) {
460 regmap_update_bits(sai->regmap, FSL_SAI_TCR4,
461 FSL_SAI_CR4_SYWD_MASK | FSL_SAI_CR4_FRSZ_MASK,
463 regmap_update_bits(sai->regmap, FSL_SAI_TCR5,
464 FSL_SAI_CR5_WNW_MASK | FSL_SAI_CR5_W0W_MASK |
465 FSL_SAI_CR5_FBT_MASK, val_cr5);
466 regmap_write(sai->regmap, FSL_SAI_TMR,
467 ~0UL - ((1 << channels) - 1));
468 } else if (!sai->synchronous[RX] && sai->synchronous[TX] && tx) {
469 regmap_update_bits(sai->regmap, FSL_SAI_RCR4,
470 FSL_SAI_CR4_SYWD_MASK | FSL_SAI_CR4_FRSZ_MASK,
472 regmap_update_bits(sai->regmap, FSL_SAI_RCR5,
473 FSL_SAI_CR5_WNW_MASK | FSL_SAI_CR5_W0W_MASK |
474 FSL_SAI_CR5_FBT_MASK, val_cr5);
475 regmap_write(sai->regmap, FSL_SAI_RMR,
476 ~0UL - ((1 << channels) - 1));
480 regmap_update_bits(sai->regmap, FSL_SAI_xCR4(tx),
481 FSL_SAI_CR4_SYWD_MASK | FSL_SAI_CR4_FRSZ_MASK,
483 regmap_update_bits(sai->regmap, FSL_SAI_xCR5(tx),
484 FSL_SAI_CR5_WNW_MASK | FSL_SAI_CR5_W0W_MASK |
485 FSL_SAI_CR5_FBT_MASK, val_cr5);
486 regmap_write(sai->regmap, FSL_SAI_xMR(tx), ~0UL - ((1 << channels) - 1));
491 static int fsl_sai_hw_free(struct snd_pcm_substream *substream,
492 struct snd_soc_dai *cpu_dai)
494 struct fsl_sai *sai = snd_soc_dai_get_drvdata(cpu_dai);
495 bool tx = substream->stream == SNDRV_PCM_STREAM_PLAYBACK;
497 if (!sai->is_slave_mode &&
498 sai->mclk_streams & BIT(substream->stream)) {
499 clk_disable_unprepare(sai->mclk_clk[sai->mclk_id[tx]]);
500 sai->mclk_streams &= ~BIT(substream->stream);
507 static int fsl_sai_trigger(struct snd_pcm_substream *substream, int cmd,
508 struct snd_soc_dai *cpu_dai)
510 struct fsl_sai *sai = snd_soc_dai_get_drvdata(cpu_dai);
511 bool tx = substream->stream == SNDRV_PCM_STREAM_PLAYBACK;
512 u32 xcsr, count = 100;
515 * Asynchronous mode: Clear SYNC for both Tx and Rx.
516 * Rx sync with Tx clocks: Clear SYNC for Tx, set it for Rx.
517 * Tx sync with Rx clocks: Clear SYNC for Rx, set it for Tx.
519 regmap_update_bits(sai->regmap, FSL_SAI_TCR2, FSL_SAI_CR2_SYNC,
520 sai->synchronous[TX] ? FSL_SAI_CR2_SYNC : 0);
521 regmap_update_bits(sai->regmap, FSL_SAI_RCR2, FSL_SAI_CR2_SYNC,
522 sai->synchronous[RX] ? FSL_SAI_CR2_SYNC : 0);
525 * It is recommended that the transmitter is the last enabled
526 * and the first disabled.
529 case SNDRV_PCM_TRIGGER_START:
530 case SNDRV_PCM_TRIGGER_RESUME:
531 case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
532 regmap_update_bits(sai->regmap, FSL_SAI_xCSR(tx),
533 FSL_SAI_CSR_FRDE, FSL_SAI_CSR_FRDE);
535 regmap_update_bits(sai->regmap, FSL_SAI_RCSR,
536 FSL_SAI_CSR_TERE, FSL_SAI_CSR_TERE);
537 regmap_update_bits(sai->regmap, FSL_SAI_TCSR,
538 FSL_SAI_CSR_TERE, FSL_SAI_CSR_TERE);
540 regmap_update_bits(sai->regmap, FSL_SAI_xCSR(tx),
541 FSL_SAI_CSR_xIE_MASK, FSL_SAI_FLAGS);
543 case SNDRV_PCM_TRIGGER_STOP:
544 case SNDRV_PCM_TRIGGER_SUSPEND:
545 case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
546 regmap_update_bits(sai->regmap, FSL_SAI_xCSR(tx),
547 FSL_SAI_CSR_FRDE, 0);
548 regmap_update_bits(sai->regmap, FSL_SAI_xCSR(tx),
549 FSL_SAI_CSR_xIE_MASK, 0);
551 /* Check if the opposite FRDE is also disabled */
552 regmap_read(sai->regmap, FSL_SAI_xCSR(!tx), &xcsr);
553 if (!(xcsr & FSL_SAI_CSR_FRDE)) {
554 /* Disable both directions and reset their FIFOs */
555 regmap_update_bits(sai->regmap, FSL_SAI_TCSR,
556 FSL_SAI_CSR_TERE, 0);
557 regmap_update_bits(sai->regmap, FSL_SAI_RCSR,
558 FSL_SAI_CSR_TERE, 0);
560 /* TERE will remain set till the end of current frame */
563 regmap_read(sai->regmap, FSL_SAI_xCSR(tx), &xcsr);
564 } while (--count && xcsr & FSL_SAI_CSR_TERE);
566 regmap_update_bits(sai->regmap, FSL_SAI_TCSR,
567 FSL_SAI_CSR_FR, FSL_SAI_CSR_FR);
568 regmap_update_bits(sai->regmap, FSL_SAI_RCSR,
569 FSL_SAI_CSR_FR, FSL_SAI_CSR_FR);
572 * For sai master mode, after several open/close sai,
573 * there will be no frame clock, and can't recover
574 * anymore. Add software reset to fix this issue.
575 * This is a hardware bug, and will be fix in the
578 if (!sai->is_slave_mode) {
579 /* Software Reset for both Tx and Rx */
580 regmap_write(sai->regmap,
581 FSL_SAI_TCSR, FSL_SAI_CSR_SR);
582 regmap_write(sai->regmap,
583 FSL_SAI_RCSR, FSL_SAI_CSR_SR);
584 /* Clear SR bit to finish the reset */
585 regmap_write(sai->regmap, FSL_SAI_TCSR, 0);
586 regmap_write(sai->regmap, FSL_SAI_RCSR, 0);
597 static int fsl_sai_startup(struct snd_pcm_substream *substream,
598 struct snd_soc_dai *cpu_dai)
600 struct fsl_sai *sai = snd_soc_dai_get_drvdata(cpu_dai);
601 bool tx = substream->stream == SNDRV_PCM_STREAM_PLAYBACK;
602 struct device *dev = &sai->pdev->dev;
605 ret = clk_prepare_enable(sai->bus_clk);
607 dev_err(dev, "failed to enable bus clock: %d\n", ret);
611 regmap_update_bits(sai->regmap, FSL_SAI_xCR3(tx), FSL_SAI_CR3_TRCE,
614 ret = snd_pcm_hw_constraint_list(substream->runtime, 0,
615 SNDRV_PCM_HW_PARAM_RATE, &fsl_sai_rate_constraints);
620 static void fsl_sai_shutdown(struct snd_pcm_substream *substream,
621 struct snd_soc_dai *cpu_dai)
623 struct fsl_sai *sai = snd_soc_dai_get_drvdata(cpu_dai);
624 bool tx = substream->stream == SNDRV_PCM_STREAM_PLAYBACK;
626 regmap_update_bits(sai->regmap, FSL_SAI_xCR3(tx), FSL_SAI_CR3_TRCE, 0);
628 clk_disable_unprepare(sai->bus_clk);
631 static const struct snd_soc_dai_ops fsl_sai_pcm_dai_ops = {
632 .set_sysclk = fsl_sai_set_dai_sysclk,
633 .set_fmt = fsl_sai_set_dai_fmt,
634 .set_tdm_slot = fsl_sai_set_dai_tdm_slot,
635 .hw_params = fsl_sai_hw_params,
636 .hw_free = fsl_sai_hw_free,
637 .trigger = fsl_sai_trigger,
638 .startup = fsl_sai_startup,
639 .shutdown = fsl_sai_shutdown,
642 static int fsl_sai_dai_probe(struct snd_soc_dai *cpu_dai)
644 struct fsl_sai *sai = dev_get_drvdata(cpu_dai->dev);
646 /* Software Reset for both Tx and Rx */
647 regmap_write(sai->regmap, FSL_SAI_TCSR, FSL_SAI_CSR_SR);
648 regmap_write(sai->regmap, FSL_SAI_RCSR, FSL_SAI_CSR_SR);
649 /* Clear SR bit to finish the reset */
650 regmap_write(sai->regmap, FSL_SAI_TCSR, 0);
651 regmap_write(sai->regmap, FSL_SAI_RCSR, 0);
653 regmap_update_bits(sai->regmap, FSL_SAI_TCR1, FSL_SAI_CR1_RFW_MASK,
654 FSL_SAI_MAXBURST_TX * 2);
655 regmap_update_bits(sai->regmap, FSL_SAI_RCR1, FSL_SAI_CR1_RFW_MASK,
656 FSL_SAI_MAXBURST_RX - 1);
658 snd_soc_dai_init_dma_data(cpu_dai, &sai->dma_params_tx,
659 &sai->dma_params_rx);
661 snd_soc_dai_set_drvdata(cpu_dai, sai);
666 static struct snd_soc_dai_driver fsl_sai_dai = {
667 .probe = fsl_sai_dai_probe,
669 .stream_name = "CPU-Playback",
674 .rates = SNDRV_PCM_RATE_KNOT,
675 .formats = FSL_SAI_FORMATS,
678 .stream_name = "CPU-Capture",
683 .rates = SNDRV_PCM_RATE_KNOT,
684 .formats = FSL_SAI_FORMATS,
686 .ops = &fsl_sai_pcm_dai_ops,
689 static const struct snd_soc_component_driver fsl_component = {
693 static struct reg_default fsl_sai_reg_defaults[] = {
709 static bool fsl_sai_readable_reg(struct device *dev, unsigned int reg)
735 static bool fsl_sai_volatile_reg(struct device *dev, unsigned int reg)
749 static bool fsl_sai_writeable_reg(struct device *dev, unsigned int reg)
773 static const struct regmap_config fsl_sai_regmap_config = {
778 .max_register = FSL_SAI_RMR,
779 .reg_defaults = fsl_sai_reg_defaults,
780 .num_reg_defaults = ARRAY_SIZE(fsl_sai_reg_defaults),
781 .readable_reg = fsl_sai_readable_reg,
782 .volatile_reg = fsl_sai_volatile_reg,
783 .writeable_reg = fsl_sai_writeable_reg,
784 .cache_type = REGCACHE_FLAT,
787 static int fsl_sai_probe(struct platform_device *pdev)
789 struct device_node *np = pdev->dev.of_node;
792 struct resource *res;
798 sai = devm_kzalloc(&pdev->dev, sizeof(*sai), GFP_KERNEL);
804 if (of_device_is_compatible(pdev->dev.of_node, "fsl,imx6sx-sai") ||
805 of_device_is_compatible(pdev->dev.of_node, "fsl,imx6ul-sai"))
806 sai->sai_on_imx = true;
808 sai->is_lsb_first = of_property_read_bool(np, "lsb-first");
810 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
811 base = devm_ioremap_resource(&pdev->dev, res);
813 return PTR_ERR(base);
815 sai->regmap = devm_regmap_init_mmio_clk(&pdev->dev,
816 "bus", base, &fsl_sai_regmap_config);
818 /* Compatible with old DTB cases */
819 if (IS_ERR(sai->regmap))
820 sai->regmap = devm_regmap_init_mmio_clk(&pdev->dev,
821 "sai", base, &fsl_sai_regmap_config);
822 if (IS_ERR(sai->regmap)) {
823 dev_err(&pdev->dev, "regmap init failed\n");
824 return PTR_ERR(sai->regmap);
827 /* No error out for old DTB cases but only mark the clock NULL */
828 sai->bus_clk = devm_clk_get(&pdev->dev, "bus");
829 if (IS_ERR(sai->bus_clk)) {
830 dev_err(&pdev->dev, "failed to get bus clock: %ld\n",
831 PTR_ERR(sai->bus_clk));
835 sai->mclk_clk[0] = sai->bus_clk;
836 for (i = 1; i < FSL_SAI_MCLK_MAX; i++) {
837 sprintf(tmp, "mclk%d", i);
838 sai->mclk_clk[i] = devm_clk_get(&pdev->dev, tmp);
839 if (IS_ERR(sai->mclk_clk[i])) {
840 dev_err(&pdev->dev, "failed to get mclk%d clock: %ld\n",
841 i + 1, PTR_ERR(sai->mclk_clk[i]));
842 sai->mclk_clk[i] = NULL;
846 irq = platform_get_irq(pdev, 0);
848 dev_err(&pdev->dev, "no irq for node %s\n", pdev->name);
852 ret = devm_request_irq(&pdev->dev, irq, fsl_sai_isr, 0, np->name, sai);
854 dev_err(&pdev->dev, "failed to claim irq %u\n", irq);
858 /* Sync Tx with Rx as default by following old DT binding */
859 sai->synchronous[RX] = true;
860 sai->synchronous[TX] = false;
861 fsl_sai_dai.symmetric_rates = 1;
862 fsl_sai_dai.symmetric_channels = 1;
863 fsl_sai_dai.symmetric_samplebits = 1;
865 if (of_find_property(np, "fsl,sai-synchronous-rx", NULL) &&
866 of_find_property(np, "fsl,sai-asynchronous", NULL)) {
867 /* error out if both synchronous and asynchronous are present */
868 dev_err(&pdev->dev, "invalid binding for synchronous mode\n");
872 if (of_find_property(np, "fsl,sai-synchronous-rx", NULL)) {
873 /* Sync Rx with Tx */
874 sai->synchronous[RX] = false;
875 sai->synchronous[TX] = true;
876 } else if (of_find_property(np, "fsl,sai-asynchronous", NULL)) {
877 /* Discard all settings for asynchronous mode */
878 sai->synchronous[RX] = false;
879 sai->synchronous[TX] = false;
880 fsl_sai_dai.symmetric_rates = 0;
881 fsl_sai_dai.symmetric_channels = 0;
882 fsl_sai_dai.symmetric_samplebits = 0;
885 if (of_find_property(np, "fsl,sai-mclk-direction-output", NULL) &&
886 of_device_is_compatible(pdev->dev.of_node, "fsl,imx6ul-sai")) {
887 gpr = syscon_regmap_lookup_by_compatible("fsl,imx6ul-iomuxc-gpr");
889 dev_err(&pdev->dev, "cannot find iomuxc registers\n");
893 index = of_alias_get_id(np, "sai");
897 regmap_update_bits(gpr, IOMUXC_GPR1, MCLK_DIR(index),
901 sai->dma_params_rx.addr = res->start + FSL_SAI_RDR;
902 sai->dma_params_tx.addr = res->start + FSL_SAI_TDR;
903 sai->dma_params_rx.maxburst = FSL_SAI_MAXBURST_RX;
904 sai->dma_params_tx.maxburst = FSL_SAI_MAXBURST_TX;
906 platform_set_drvdata(pdev, sai);
908 ret = devm_snd_soc_register_component(&pdev->dev, &fsl_component,
914 return imx_pcm_dma_init(pdev, IMX_SAI_DMABUF_SIZE);
916 return devm_snd_dmaengine_pcm_register(&pdev->dev, NULL, 0);
919 static const struct of_device_id fsl_sai_ids[] = {
920 { .compatible = "fsl,vf610-sai", },
921 { .compatible = "fsl,imx6sx-sai", },
922 { .compatible = "fsl,imx6ul-sai", },
925 MODULE_DEVICE_TABLE(of, fsl_sai_ids);
927 #ifdef CONFIG_PM_SLEEP
928 static int fsl_sai_suspend(struct device *dev)
930 struct fsl_sai *sai = dev_get_drvdata(dev);
932 regcache_cache_only(sai->regmap, true);
933 regcache_mark_dirty(sai->regmap);
938 static int fsl_sai_resume(struct device *dev)
940 struct fsl_sai *sai = dev_get_drvdata(dev);
942 regcache_cache_only(sai->regmap, false);
943 regmap_write(sai->regmap, FSL_SAI_TCSR, FSL_SAI_CSR_SR);
944 regmap_write(sai->regmap, FSL_SAI_RCSR, FSL_SAI_CSR_SR);
945 usleep_range(1000, 2000);
946 regmap_write(sai->regmap, FSL_SAI_TCSR, 0);
947 regmap_write(sai->regmap, FSL_SAI_RCSR, 0);
948 return regcache_sync(sai->regmap);
950 #endif /* CONFIG_PM_SLEEP */
952 static const struct dev_pm_ops fsl_sai_pm_ops = {
953 SET_SYSTEM_SLEEP_PM_OPS(fsl_sai_suspend, fsl_sai_resume)
956 static struct platform_driver fsl_sai_driver = {
957 .probe = fsl_sai_probe,
960 .pm = &fsl_sai_pm_ops,
961 .of_match_table = fsl_sai_ids,
964 module_platform_driver(fsl_sai_driver);
966 MODULE_DESCRIPTION("Freescale Soc SAI Interface");
968 MODULE_ALIAS("platform:fsl-sai");
969 MODULE_LICENSE("GPL");