Version:  2.0.40 2.2.26 2.4.37 3.6 3.7 3.8 3.9 3.10 3.11 3.12 3.13 3.14 3.15 3.16 3.17 3.18 3.19 4.0 4.1 4.2

Linux/sound/soc/fsl/fsl_sai.c

  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 u32 fsl_sai_rates[] = {
 31         8000, 11025, 12000, 16000, 22050,
 32         24000, 32000, 44100, 48000, 64000,
 33         88200, 96000, 176400, 192000
 34 };
 35 
 36 static struct snd_pcm_hw_constraint_list fsl_sai_rate_constraints = {
 37         .count = ARRAY_SIZE(fsl_sai_rates),
 38         .list = fsl_sai_rates,
 39 };
 40 
 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 
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 
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 
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                 break;
264         case SND_SOC_DAIFMT_CBM_CFM:
265                 sai->is_slave_mode = true;
266                 break;
267         case SND_SOC_DAIFMT_CBS_CFM:
268                 val_cr2 |= FSL_SAI_CR2_BCD_MSTR;
269                 break;
270         case SND_SOC_DAIFMT_CBM_CFS:
271                 val_cr4 |= FSL_SAI_CR4_FSD_MSTR;
272                 sai->is_slave_mode = true;
273                 break;
274         default:
275                 return -EINVAL;
276         }
277 
278         regmap_update_bits(sai->regmap, FSL_SAI_xCR2(tx),
279                            FSL_SAI_CR2_BCP | FSL_SAI_CR2_BCD_MSTR, val_cr2);
280         regmap_update_bits(sai->regmap, FSL_SAI_xCR4(tx),
281                            FSL_SAI_CR4_MF | FSL_SAI_CR4_FSE |
282                            FSL_SAI_CR4_FSP | FSL_SAI_CR4_FSD_MSTR, val_cr4);
283 
284         return 0;
285 }
286 
287 static int fsl_sai_set_dai_fmt(struct snd_soc_dai *cpu_dai, unsigned int fmt)
288 {
289         int ret;
290 
291         ret = fsl_sai_set_dai_fmt_tr(cpu_dai, fmt, FSL_FMT_TRANSMITTER);
292         if (ret) {
293                 dev_err(cpu_dai->dev, "Cannot set tx format: %d\n", ret);
294                 return ret;
295         }
296 
297         ret = fsl_sai_set_dai_fmt_tr(cpu_dai, fmt, FSL_FMT_RECEIVER);
298         if (ret)
299                 dev_err(cpu_dai->dev, "Cannot set rx format: %d\n", ret);
300 
301         return ret;
302 }
303 
304 static int fsl_sai_set_bclk(struct snd_soc_dai *dai, bool tx, u32 freq)
305 {
306         struct fsl_sai *sai = snd_soc_dai_get_drvdata(dai);
307         unsigned long clk_rate;
308         u32 savediv = 0, ratio, savesub = freq;
309         u32 id;
310         int ret = 0;
311 
312         /* Don't apply to slave mode */
313         if (sai->is_slave_mode)
314                 return 0;
315 
316         for (id = 0; id < FSL_SAI_MCLK_MAX; id++) {
317                 clk_rate = clk_get_rate(sai->mclk_clk[id]);
318                 if (!clk_rate)
319                         continue;
320 
321                 ratio = clk_rate / freq;
322 
323                 ret = clk_rate - ratio * freq;
324 
325                 /*
326                  * Drop the source that can not be
327                  * divided into the required rate.
328                  */
329                 if (ret != 0 && clk_rate / ret < 1000)
330                         continue;
331 
332                 dev_dbg(dai->dev,
333                         "ratio %d for freq %dHz based on clock %ldHz\n",
334                         ratio, freq, clk_rate);
335 
336                 if (ratio % 2 == 0 && ratio >= 2 && ratio <= 512)
337                         ratio /= 2;
338                 else
339                         continue;
340 
341                 if (ret < savesub) {
342                         savediv = ratio;
343                         sai->mclk_id[tx] = id;
344                         savesub = ret;
345                 }
346 
347                 if (ret == 0)
348                         break;
349         }
350 
351         if (savediv == 0) {
352                 dev_err(dai->dev, "failed to derive required %cx rate: %d\n",
353                                 tx ? 'T' : 'R', freq);
354                 return -EINVAL;
355         }
356 
357         if ((tx && sai->synchronous[TX]) || (!tx && !sai->synchronous[RX])) {
358                 regmap_update_bits(sai->regmap, FSL_SAI_RCR2,
359                                    FSL_SAI_CR2_MSEL_MASK,
360                                    FSL_SAI_CR2_MSEL(sai->mclk_id[tx]));
361                 regmap_update_bits(sai->regmap, FSL_SAI_RCR2,
362                                    FSL_SAI_CR2_DIV_MASK, savediv - 1);
363         } else {
364                 regmap_update_bits(sai->regmap, FSL_SAI_TCR2,
365                                    FSL_SAI_CR2_MSEL_MASK,
366                                    FSL_SAI_CR2_MSEL(sai->mclk_id[tx]));
367                 regmap_update_bits(sai->regmap, FSL_SAI_TCR2,
368                                    FSL_SAI_CR2_DIV_MASK, savediv - 1);
369         }
370 
371         dev_dbg(dai->dev, "best fit: clock id=%d, div=%d, deviation =%d\n",
372                         sai->mclk_id[tx], savediv, savesub);
373 
374         return 0;
375 }
376 
377 static int fsl_sai_hw_params(struct snd_pcm_substream *substream,
378                 struct snd_pcm_hw_params *params,
379                 struct snd_soc_dai *cpu_dai)
380 {
381         struct fsl_sai *sai = snd_soc_dai_get_drvdata(cpu_dai);
382         bool tx = substream->stream == SNDRV_PCM_STREAM_PLAYBACK;
383         unsigned int channels = params_channels(params);
384         u32 word_width = snd_pcm_format_width(params_format(params));
385         u32 val_cr4 = 0, val_cr5 = 0;
386         int ret;
387 
388         if (!sai->is_slave_mode) {
389                 ret = fsl_sai_set_bclk(cpu_dai, tx,
390                         2 * word_width * params_rate(params));
391                 if (ret)
392                         return ret;
393 
394                 /* Do not enable the clock if it is already enabled */
395                 if (!(sai->mclk_streams & BIT(substream->stream))) {
396                         ret = clk_prepare_enable(sai->mclk_clk[sai->mclk_id[tx]]);
397                         if (ret)
398                                 return ret;
399 
400                         sai->mclk_streams |= BIT(substream->stream);
401                 }
402 
403         }
404 
405         if (!sai->is_dsp_mode)
406                 val_cr4 |= FSL_SAI_CR4_SYWD(word_width);
407 
408         val_cr5 |= FSL_SAI_CR5_WNW(word_width);
409         val_cr5 |= FSL_SAI_CR5_W0W(word_width);
410 
411         if (sai->is_lsb_first)
412                 val_cr5 |= FSL_SAI_CR5_FBT(0);
413         else
414                 val_cr5 |= FSL_SAI_CR5_FBT(word_width - 1);
415 
416         val_cr4 |= FSL_SAI_CR4_FRSZ(channels);
417 
418         regmap_update_bits(sai->regmap, FSL_SAI_xCR4(tx),
419                            FSL_SAI_CR4_SYWD_MASK | FSL_SAI_CR4_FRSZ_MASK,
420                            val_cr4);
421         regmap_update_bits(sai->regmap, FSL_SAI_xCR5(tx),
422                            FSL_SAI_CR5_WNW_MASK | FSL_SAI_CR5_W0W_MASK |
423                            FSL_SAI_CR5_FBT_MASK, val_cr5);
424         regmap_write(sai->regmap, FSL_SAI_xMR(tx), ~0UL - ((1 << channels) - 1));
425 
426         return 0;
427 }
428 
429 static int fsl_sai_hw_free(struct snd_pcm_substream *substream,
430                 struct snd_soc_dai *cpu_dai)
431 {
432         struct fsl_sai *sai = snd_soc_dai_get_drvdata(cpu_dai);
433         bool tx = substream->stream == SNDRV_PCM_STREAM_PLAYBACK;
434 
435         if (!sai->is_slave_mode &&
436                         sai->mclk_streams & BIT(substream->stream)) {
437                 clk_disable_unprepare(sai->mclk_clk[sai->mclk_id[tx]]);
438                 sai->mclk_streams &= ~BIT(substream->stream);
439         }
440 
441         return 0;
442 }
443 
444 
445 static int fsl_sai_trigger(struct snd_pcm_substream *substream, int cmd,
446                 struct snd_soc_dai *cpu_dai)
447 {
448         struct fsl_sai *sai = snd_soc_dai_get_drvdata(cpu_dai);
449         bool tx = substream->stream == SNDRV_PCM_STREAM_PLAYBACK;
450         u32 xcsr, count = 100;
451 
452         /*
453          * Asynchronous mode: Clear SYNC for both Tx and Rx.
454          * Rx sync with Tx clocks: Clear SYNC for Tx, set it for Rx.
455          * Tx sync with Rx clocks: Clear SYNC for Rx, set it for Tx.
456          */
457         regmap_update_bits(sai->regmap, FSL_SAI_TCR2, FSL_SAI_CR2_SYNC, 0);
458         regmap_update_bits(sai->regmap, FSL_SAI_RCR2, FSL_SAI_CR2_SYNC,
459                            sai->synchronous[RX] ? FSL_SAI_CR2_SYNC : 0);
460 
461         /*
462          * It is recommended that the transmitter is the last enabled
463          * and the first disabled.
464          */
465         switch (cmd) {
466         case SNDRV_PCM_TRIGGER_START:
467         case SNDRV_PCM_TRIGGER_RESUME:
468         case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
469                 regmap_update_bits(sai->regmap, FSL_SAI_xCSR(tx),
470                                    FSL_SAI_CSR_FRDE, FSL_SAI_CSR_FRDE);
471 
472                 regmap_update_bits(sai->regmap, FSL_SAI_RCSR,
473                                    FSL_SAI_CSR_TERE, FSL_SAI_CSR_TERE);
474                 regmap_update_bits(sai->regmap, FSL_SAI_TCSR,
475                                    FSL_SAI_CSR_TERE, FSL_SAI_CSR_TERE);
476 
477                 regmap_update_bits(sai->regmap, FSL_SAI_xCSR(tx),
478                                    FSL_SAI_CSR_xIE_MASK, FSL_SAI_FLAGS);
479                 break;
480         case SNDRV_PCM_TRIGGER_STOP:
481         case SNDRV_PCM_TRIGGER_SUSPEND:
482         case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
483                 regmap_update_bits(sai->regmap, FSL_SAI_xCSR(tx),
484                                    FSL_SAI_CSR_FRDE, 0);
485                 regmap_update_bits(sai->regmap, FSL_SAI_xCSR(tx),
486                                    FSL_SAI_CSR_xIE_MASK, 0);
487 
488                 /* Check if the opposite FRDE is also disabled */
489                 regmap_read(sai->regmap, FSL_SAI_xCSR(!tx), &xcsr);
490                 if (!(xcsr & FSL_SAI_CSR_FRDE)) {
491                         /* Disable both directions and reset their FIFOs */
492                         regmap_update_bits(sai->regmap, FSL_SAI_TCSR,
493                                            FSL_SAI_CSR_TERE, 0);
494                         regmap_update_bits(sai->regmap, FSL_SAI_RCSR,
495                                            FSL_SAI_CSR_TERE, 0);
496 
497                         /* TERE will remain set till the end of current frame */
498                         do {
499                                 udelay(10);
500                                 regmap_read(sai->regmap, FSL_SAI_xCSR(tx), &xcsr);
501                         } while (--count && xcsr & FSL_SAI_CSR_TERE);
502 
503                         regmap_update_bits(sai->regmap, FSL_SAI_TCSR,
504                                            FSL_SAI_CSR_FR, FSL_SAI_CSR_FR);
505                         regmap_update_bits(sai->regmap, FSL_SAI_RCSR,
506                                            FSL_SAI_CSR_FR, FSL_SAI_CSR_FR);
507                 }
508                 break;
509         default:
510                 return -EINVAL;
511         }
512 
513         return 0;
514 }
515 
516 static int fsl_sai_startup(struct snd_pcm_substream *substream,
517                 struct snd_soc_dai *cpu_dai)
518 {
519         struct fsl_sai *sai = snd_soc_dai_get_drvdata(cpu_dai);
520         bool tx = substream->stream == SNDRV_PCM_STREAM_PLAYBACK;
521         struct device *dev = &sai->pdev->dev;
522         int ret;
523 
524         ret = clk_prepare_enable(sai->bus_clk);
525         if (ret) {
526                 dev_err(dev, "failed to enable bus clock: %d\n", ret);
527                 return ret;
528         }
529 
530         regmap_update_bits(sai->regmap, FSL_SAI_xCR3(tx), FSL_SAI_CR3_TRCE,
531                            FSL_SAI_CR3_TRCE);
532 
533         ret = snd_pcm_hw_constraint_list(substream->runtime, 0,
534                         SNDRV_PCM_HW_PARAM_RATE, &fsl_sai_rate_constraints);
535 
536         return ret;
537 }
538 
539 static void fsl_sai_shutdown(struct snd_pcm_substream *substream,
540                 struct snd_soc_dai *cpu_dai)
541 {
542         struct fsl_sai *sai = snd_soc_dai_get_drvdata(cpu_dai);
543         bool tx = substream->stream == SNDRV_PCM_STREAM_PLAYBACK;
544 
545         regmap_update_bits(sai->regmap, FSL_SAI_xCR3(tx), FSL_SAI_CR3_TRCE, 0);
546 
547         clk_disable_unprepare(sai->bus_clk);
548 }
549 
550 static const struct snd_soc_dai_ops fsl_sai_pcm_dai_ops = {
551         .set_sysclk     = fsl_sai_set_dai_sysclk,
552         .set_fmt        = fsl_sai_set_dai_fmt,
553         .hw_params      = fsl_sai_hw_params,
554         .hw_free        = fsl_sai_hw_free,
555         .trigger        = fsl_sai_trigger,
556         .startup        = fsl_sai_startup,
557         .shutdown       = fsl_sai_shutdown,
558 };
559 
560 static int fsl_sai_dai_probe(struct snd_soc_dai *cpu_dai)
561 {
562         struct fsl_sai *sai = dev_get_drvdata(cpu_dai->dev);
563 
564         /* Software Reset for both Tx and Rx */
565         regmap_write(sai->regmap, FSL_SAI_TCSR, FSL_SAI_CSR_SR);
566         regmap_write(sai->regmap, FSL_SAI_RCSR, FSL_SAI_CSR_SR);
567         /* Clear SR bit to finish the reset */
568         regmap_write(sai->regmap, FSL_SAI_TCSR, 0);
569         regmap_write(sai->regmap, FSL_SAI_RCSR, 0);
570 
571         regmap_update_bits(sai->regmap, FSL_SAI_TCR1, FSL_SAI_CR1_RFW_MASK,
572                            FSL_SAI_MAXBURST_TX * 2);
573         regmap_update_bits(sai->regmap, FSL_SAI_RCR1, FSL_SAI_CR1_RFW_MASK,
574                            FSL_SAI_MAXBURST_RX - 1);
575 
576         snd_soc_dai_init_dma_data(cpu_dai, &sai->dma_params_tx,
577                                 &sai->dma_params_rx);
578 
579         snd_soc_dai_set_drvdata(cpu_dai, sai);
580 
581         return 0;
582 }
583 
584 static struct snd_soc_dai_driver fsl_sai_dai = {
585         .probe = fsl_sai_dai_probe,
586         .playback = {
587                 .stream_name = "CPU-Playback",
588                 .channels_min = 1,
589                 .channels_max = 2,
590                 .rate_min = 8000,
591                 .rate_max = 192000,
592                 .rates = SNDRV_PCM_RATE_KNOT,
593                 .formats = FSL_SAI_FORMATS,
594         },
595         .capture = {
596                 .stream_name = "CPU-Capture",
597                 .channels_min = 1,
598                 .channels_max = 2,
599                 .rate_min = 8000,
600                 .rate_max = 192000,
601                 .rates = SNDRV_PCM_RATE_KNOT,
602                 .formats = FSL_SAI_FORMATS,
603         },
604         .ops = &fsl_sai_pcm_dai_ops,
605 };
606 
607 static const struct snd_soc_component_driver fsl_component = {
608         .name           = "fsl-sai",
609 };
610 
611 static bool fsl_sai_readable_reg(struct device *dev, unsigned int reg)
612 {
613         switch (reg) {
614         case FSL_SAI_TCSR:
615         case FSL_SAI_TCR1:
616         case FSL_SAI_TCR2:
617         case FSL_SAI_TCR3:
618         case FSL_SAI_TCR4:
619         case FSL_SAI_TCR5:
620         case FSL_SAI_TFR:
621         case FSL_SAI_TMR:
622         case FSL_SAI_RCSR:
623         case FSL_SAI_RCR1:
624         case FSL_SAI_RCR2:
625         case FSL_SAI_RCR3:
626         case FSL_SAI_RCR4:
627         case FSL_SAI_RCR5:
628         case FSL_SAI_RDR:
629         case FSL_SAI_RFR:
630         case FSL_SAI_RMR:
631                 return true;
632         default:
633                 return false;
634         }
635 }
636 
637 static bool fsl_sai_volatile_reg(struct device *dev, unsigned int reg)
638 {
639         switch (reg) {
640         case FSL_SAI_TFR:
641         case FSL_SAI_RFR:
642         case FSL_SAI_TDR:
643         case FSL_SAI_RDR:
644                 return true;
645         default:
646                 return false;
647         }
648 
649 }
650 
651 static bool fsl_sai_writeable_reg(struct device *dev, unsigned int reg)
652 {
653         switch (reg) {
654         case FSL_SAI_TCSR:
655         case FSL_SAI_TCR1:
656         case FSL_SAI_TCR2:
657         case FSL_SAI_TCR3:
658         case FSL_SAI_TCR4:
659         case FSL_SAI_TCR5:
660         case FSL_SAI_TDR:
661         case FSL_SAI_TMR:
662         case FSL_SAI_RCSR:
663         case FSL_SAI_RCR1:
664         case FSL_SAI_RCR2:
665         case FSL_SAI_RCR3:
666         case FSL_SAI_RCR4:
667         case FSL_SAI_RCR5:
668         case FSL_SAI_RMR:
669                 return true;
670         default:
671                 return false;
672         }
673 }
674 
675 static const struct regmap_config fsl_sai_regmap_config = {
676         .reg_bits = 32,
677         .reg_stride = 4,
678         .val_bits = 32,
679 
680         .max_register = FSL_SAI_RMR,
681         .readable_reg = fsl_sai_readable_reg,
682         .volatile_reg = fsl_sai_volatile_reg,
683         .writeable_reg = fsl_sai_writeable_reg,
684 };
685 
686 static int fsl_sai_probe(struct platform_device *pdev)
687 {
688         struct device_node *np = pdev->dev.of_node;
689         struct fsl_sai *sai;
690         struct resource *res;
691         void __iomem *base;
692         char tmp[8];
693         int irq, ret, i;
694 
695         sai = devm_kzalloc(&pdev->dev, sizeof(*sai), GFP_KERNEL);
696         if (!sai)
697                 return -ENOMEM;
698 
699         sai->pdev = pdev;
700 
701         if (of_device_is_compatible(pdev->dev.of_node, "fsl,imx6sx-sai"))
702                 sai->sai_on_imx = true;
703 
704         sai->is_lsb_first = of_property_read_bool(np, "lsb-first");
705 
706         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
707         base = devm_ioremap_resource(&pdev->dev, res);
708         if (IS_ERR(base))
709                 return PTR_ERR(base);
710 
711         sai->regmap = devm_regmap_init_mmio_clk(&pdev->dev,
712                         "bus", base, &fsl_sai_regmap_config);
713 
714         /* Compatible with old DTB cases */
715         if (IS_ERR(sai->regmap))
716                 sai->regmap = devm_regmap_init_mmio_clk(&pdev->dev,
717                                 "sai", base, &fsl_sai_regmap_config);
718         if (IS_ERR(sai->regmap)) {
719                 dev_err(&pdev->dev, "regmap init failed\n");
720                 return PTR_ERR(sai->regmap);
721         }
722 
723         /* No error out for old DTB cases but only mark the clock NULL */
724         sai->bus_clk = devm_clk_get(&pdev->dev, "bus");
725         if (IS_ERR(sai->bus_clk)) {
726                 dev_err(&pdev->dev, "failed to get bus clock: %ld\n",
727                                 PTR_ERR(sai->bus_clk));
728                 sai->bus_clk = NULL;
729         }
730 
731         sai->mclk_clk[0] = sai->bus_clk;
732         for (i = 1; i < FSL_SAI_MCLK_MAX; i++) {
733                 sprintf(tmp, "mclk%d", i);
734                 sai->mclk_clk[i] = devm_clk_get(&pdev->dev, tmp);
735                 if (IS_ERR(sai->mclk_clk[i])) {
736                         dev_err(&pdev->dev, "failed to get mclk%d clock: %ld\n",
737                                         i + 1, PTR_ERR(sai->mclk_clk[i]));
738                         sai->mclk_clk[i] = NULL;
739                 }
740         }
741 
742         irq = platform_get_irq(pdev, 0);
743         if (irq < 0) {
744                 dev_err(&pdev->dev, "no irq for node %s\n", pdev->name);
745                 return irq;
746         }
747 
748         ret = devm_request_irq(&pdev->dev, irq, fsl_sai_isr, 0, np->name, sai);
749         if (ret) {
750                 dev_err(&pdev->dev, "failed to claim irq %u\n", irq);
751                 return ret;
752         }
753 
754         /* Sync Tx with Rx as default by following old DT binding */
755         sai->synchronous[RX] = true;
756         sai->synchronous[TX] = false;
757         fsl_sai_dai.symmetric_rates = 1;
758         fsl_sai_dai.symmetric_channels = 1;
759         fsl_sai_dai.symmetric_samplebits = 1;
760 
761         if (of_find_property(np, "fsl,sai-synchronous-rx", NULL) &&
762             of_find_property(np, "fsl,sai-asynchronous", NULL)) {
763                 /* error out if both synchronous and asynchronous are present */
764                 dev_err(&pdev->dev, "invalid binding for synchronous mode\n");
765                 return -EINVAL;
766         }
767 
768         if (of_find_property(np, "fsl,sai-synchronous-rx", NULL)) {
769                 /* Sync Rx with Tx */
770                 sai->synchronous[RX] = false;
771                 sai->synchronous[TX] = true;
772         } else if (of_find_property(np, "fsl,sai-asynchronous", NULL)) {
773                 /* Discard all settings for asynchronous mode */
774                 sai->synchronous[RX] = false;
775                 sai->synchronous[TX] = false;
776                 fsl_sai_dai.symmetric_rates = 0;
777                 fsl_sai_dai.symmetric_channels = 0;
778                 fsl_sai_dai.symmetric_samplebits = 0;
779         }
780 
781         sai->dma_params_rx.addr = res->start + FSL_SAI_RDR;
782         sai->dma_params_tx.addr = res->start + FSL_SAI_TDR;
783         sai->dma_params_rx.maxburst = FSL_SAI_MAXBURST_RX;
784         sai->dma_params_tx.maxburst = FSL_SAI_MAXBURST_TX;
785 
786         platform_set_drvdata(pdev, sai);
787 
788         ret = devm_snd_soc_register_component(&pdev->dev, &fsl_component,
789                         &fsl_sai_dai, 1);
790         if (ret)
791                 return ret;
792 
793         if (sai->sai_on_imx)
794                 return imx_pcm_dma_init(pdev);
795         else
796                 return devm_snd_dmaengine_pcm_register(&pdev->dev, NULL, 0);
797 }
798 
799 static const struct of_device_id fsl_sai_ids[] = {
800         { .compatible = "fsl,vf610-sai", },
801         { .compatible = "fsl,imx6sx-sai", },
802         { /* sentinel */ }
803 };
804 
805 static struct platform_driver fsl_sai_driver = {
806         .probe = fsl_sai_probe,
807         .driver = {
808                 .name = "fsl-sai",
809                 .of_match_table = fsl_sai_ids,
810         },
811 };
812 module_platform_driver(fsl_sai_driver);
813 
814 MODULE_DESCRIPTION("Freescale Soc SAI Interface");
815 MODULE_AUTHOR("Xiubo Li, <Li.Xiubo@freescale.com>");
816 MODULE_ALIAS("platform:fsl-sai");
817 MODULE_LICENSE("GPL");
818 

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