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Merge remote-tracking branch 'regulator/for-next'
[deliverable/linux.git] / sound / soc / fsl / fsl_asrc.c
1 /*
2 * Freescale ASRC ALSA SoC Digital Audio Interface (DAI) driver
3 *
4 * Copyright (C) 2014 Freescale Semiconductor, Inc.
5 *
6 * Author: Nicolin Chen <nicoleotsuka@gmail.com>
7 *
8 * This file is licensed under the terms of the GNU General Public License
9 * version 2. This program is licensed "as is" without any warranty of any
10 * kind, whether express or implied.
11 */
12
13 #include <linux/clk.h>
14 #include <linux/delay.h>
15 #include <linux/dma-mapping.h>
16 #include <linux/module.h>
17 #include <linux/of_platform.h>
18 #include <linux/platform_data/dma-imx.h>
19 #include <linux/pm_runtime.h>
20 #include <sound/dmaengine_pcm.h>
21 #include <sound/pcm_params.h>
22
23 #include "fsl_asrc.h"
24
25 #define IDEAL_RATIO_DECIMAL_DEPTH 26
26
27 #define pair_err(fmt, ...) \
28 dev_err(&asrc_priv->pdev->dev, "Pair %c: " fmt, 'A' + index, ##__VA_ARGS__)
29
30 #define pair_dbg(fmt, ...) \
31 dev_dbg(&asrc_priv->pdev->dev, "Pair %c: " fmt, 'A' + index, ##__VA_ARGS__)
32
33 /* Sample rates are aligned with that defined in pcm.h file */
34 static const u8 process_option[][12][2] = {
35 /* 8kHz 11.025kHz 16kHz 22.05kHz 32kHz 44.1kHz 48kHz 64kHz 88.2kHz 96kHz 176kHz 192kHz */
36 {{0, 1}, {0, 1}, {0, 1}, {0, 0}, {0, 0}, {0, 0}, {0, 0}, {0, 0}, {0, 0}, {0, 0}, {0, 0}, {0, 0},}, /* 5512Hz */
37 {{0, 1}, {0, 1}, {0, 1}, {0, 1}, {0, 0}, {0, 0}, {0, 0}, {0, 0}, {0, 0}, {0, 0}, {0, 0}, {0, 0},}, /* 8kHz */
38 {{0, 2}, {0, 1}, {0, 1}, {0, 1}, {0, 0}, {0, 0}, {0, 0}, {0, 0}, {0, 0}, {0, 0}, {0, 0}, {0, 0},}, /* 11025Hz */
39 {{1, 2}, {0, 2}, {0, 1}, {0, 1}, {0, 1}, {0, 1}, {0, 1}, {0, 0}, {0, 0}, {0, 0}, {0, 0}, {0, 0},}, /* 16kHz */
40 {{1, 2}, {1, 2}, {0, 2}, {0, 1}, {0, 1}, {0, 1}, {0, 1}, {0, 0}, {0, 0}, {0, 0}, {0, 0}, {0, 0},}, /* 22050Hz */
41 {{1, 2}, {2, 1}, {2, 1}, {0, 2}, {0, 1}, {0, 1}, {0, 1}, {0, 1}, {0, 1}, {0, 0}, {0, 0}, {0, 0},}, /* 32kHz */
42 {{2, 2}, {2, 2}, {2, 1}, {2, 1}, {0, 2}, {0, 1}, {0, 1}, {0, 1}, {0, 1}, {0, 1}, {0, 0}, {0, 0},}, /* 44.1kHz */
43 {{2, 2}, {2, 2}, {2, 1}, {2, 1}, {0, 2}, {0, 2}, {0, 1}, {0, 1}, {0, 1}, {0, 1}, {0, 0}, {0, 0},}, /* 48kHz */
44 {{2, 2}, {2, 2}, {2, 2}, {2, 1}, {1, 2}, {0, 2}, {0, 2}, {0, 1}, {0, 1}, {0, 1}, {0, 1}, {0, 0},}, /* 64kHz */
45 {{2, 2}, {2, 2}, {2, 2}, {2, 2}, {1, 2}, {1, 2}, {1, 2}, {1, 1}, {1, 1}, {1, 1}, {1, 1}, {1, 1},}, /* 88.2kHz */
46 {{2, 2}, {2, 2}, {2, 2}, {2, 2}, {1, 2}, {1, 2}, {1, 2}, {1, 1}, {1, 1}, {1, 1}, {1, 1}, {1, 1},}, /* 96kHz */
47 {{2, 2}, {2, 2}, {2, 2}, {2, 2}, {2, 2}, {2, 2}, {2, 2}, {2, 1}, {2, 1}, {2, 1}, {2, 1}, {2, 1},}, /* 176kHz */
48 {{2, 2}, {2, 2}, {2, 2}, {2, 2}, {2, 2}, {2, 2}, {2, 2}, {2, 1}, {2, 1}, {2, 1}, {2, 1}, {2, 1},}, /* 192kHz */
49 };
50
51 /* Corresponding to process_option */
52 static int supported_input_rate[] = {
53 5512, 8000, 11025, 16000, 22050, 32000, 44100, 48000, 64000, 88200,
54 96000, 176400, 192000,
55 };
56
57 static int supported_asrc_rate[] = {
58 8000, 11025, 16000, 22050, 32000, 44100, 48000, 64000, 88200, 96000, 176400, 192000,
59 };
60
61 /**
62 * The following tables map the relationship between asrc_inclk/asrc_outclk in
63 * fsl_asrc.h and the registers of ASRCSR
64 */
65 static unsigned char input_clk_map_imx35[] = {
66 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 0xa, 0xb, 0xc, 0xd, 0xe, 0xf,
67 };
68
69 static unsigned char output_clk_map_imx35[] = {
70 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 0xa, 0xb, 0xc, 0xd, 0xe, 0xf,
71 };
72
73 /* i.MX53 uses the same map for input and output */
74 static unsigned char input_clk_map_imx53[] = {
75 /* 0x0 0x1 0x2 0x3 0x4 0x5 0x6 0x7 0x8 0x9 0xa 0xb 0xc 0xd 0xe 0xf */
76 0x0, 0x1, 0x2, 0x7, 0x4, 0x5, 0x6, 0x3, 0x8, 0x9, 0xa, 0xb, 0xc, 0xf, 0xe, 0xd,
77 };
78
79 static unsigned char output_clk_map_imx53[] = {
80 /* 0x0 0x1 0x2 0x3 0x4 0x5 0x6 0x7 0x8 0x9 0xa 0xb 0xc 0xd 0xe 0xf */
81 0x8, 0x9, 0xa, 0x7, 0xc, 0x5, 0x6, 0xb, 0x0, 0x1, 0x2, 0x3, 0x4, 0xf, 0xe, 0xd,
82 };
83
84 static unsigned char *clk_map[2];
85
86 /**
87 * Request ASRC pair
88 *
89 * It assigns pair by the order of A->C->B because allocation of pair B,
90 * within range [ANCA, ANCA+ANCB-1], depends on the channels of pair A
91 * while pair A and pair C are comparatively independent.
92 */
93 static int fsl_asrc_request_pair(int channels, struct fsl_asrc_pair *pair)
94 {
95 enum asrc_pair_index index = ASRC_INVALID_PAIR;
96 struct fsl_asrc *asrc_priv = pair->asrc_priv;
97 struct device *dev = &asrc_priv->pdev->dev;
98 unsigned long lock_flags;
99 int i, ret = 0;
100
101 spin_lock_irqsave(&asrc_priv->lock, lock_flags);
102
103 for (i = ASRC_PAIR_A; i < ASRC_PAIR_MAX_NUM; i++) {
104 if (asrc_priv->pair[i] != NULL)
105 continue;
106
107 index = i;
108
109 if (i != ASRC_PAIR_B)
110 break;
111 }
112
113 if (index == ASRC_INVALID_PAIR) {
114 dev_err(dev, "all pairs are busy now\n");
115 ret = -EBUSY;
116 } else if (asrc_priv->channel_avail < channels) {
117 dev_err(dev, "can't afford required channels: %d\n", channels);
118 ret = -EINVAL;
119 } else {
120 asrc_priv->channel_avail -= channels;
121 asrc_priv->pair[index] = pair;
122 pair->channels = channels;
123 pair->index = index;
124 }
125
126 spin_unlock_irqrestore(&asrc_priv->lock, lock_flags);
127
128 return ret;
129 }
130
131 /**
132 * Release ASRC pair
133 *
134 * It clears the resource from asrc_priv and releases the occupied channels.
135 */
136 static void fsl_asrc_release_pair(struct fsl_asrc_pair *pair)
137 {
138 struct fsl_asrc *asrc_priv = pair->asrc_priv;
139 enum asrc_pair_index index = pair->index;
140 unsigned long lock_flags;
141
142 /* Make sure the pair is disabled */
143 regmap_update_bits(asrc_priv->regmap, REG_ASRCTR,
144 ASRCTR_ASRCEi_MASK(index), 0);
145
146 spin_lock_irqsave(&asrc_priv->lock, lock_flags);
147
148 asrc_priv->channel_avail += pair->channels;
149 asrc_priv->pair[index] = NULL;
150 pair->error = 0;
151
152 spin_unlock_irqrestore(&asrc_priv->lock, lock_flags);
153 }
154
155 /**
156 * Configure input and output thresholds
157 */
158 static void fsl_asrc_set_watermarks(struct fsl_asrc_pair *pair, u32 in, u32 out)
159 {
160 struct fsl_asrc *asrc_priv = pair->asrc_priv;
161 enum asrc_pair_index index = pair->index;
162
163 regmap_update_bits(asrc_priv->regmap, REG_ASRMCR(index),
164 ASRMCRi_EXTTHRSHi_MASK |
165 ASRMCRi_INFIFO_THRESHOLD_MASK |
166 ASRMCRi_OUTFIFO_THRESHOLD_MASK,
167 ASRMCRi_EXTTHRSHi |
168 ASRMCRi_INFIFO_THRESHOLD(in) |
169 ASRMCRi_OUTFIFO_THRESHOLD(out));
170 }
171
172 /**
173 * Calculate the total divisor between asrck clock rate and sample rate
174 *
175 * It follows the formula clk_rate = samplerate * (2 ^ prescaler) * divider
176 */
177 static u32 fsl_asrc_cal_asrck_divisor(struct fsl_asrc_pair *pair, u32 div)
178 {
179 u32 ps;
180
181 /* Calculate the divisors: prescaler [2^0, 2^7], divder [1, 8] */
182 for (ps = 0; div > 8; ps++)
183 div >>= 1;
184
185 return ((div - 1) << ASRCDRi_AxCPi_WIDTH) | ps;
186 }
187
188 /**
189 * Calculate and set the ratio for Ideal Ratio mode only
190 *
191 * The ratio is a 32-bit fixed point value with 26 fractional bits.
192 */
193 static int fsl_asrc_set_ideal_ratio(struct fsl_asrc_pair *pair,
194 int inrate, int outrate)
195 {
196 struct fsl_asrc *asrc_priv = pair->asrc_priv;
197 enum asrc_pair_index index = pair->index;
198 unsigned long ratio;
199 int i;
200
201 if (!outrate) {
202 pair_err("output rate should not be zero\n");
203 return -EINVAL;
204 }
205
206 /* Calculate the intergal part of the ratio */
207 ratio = (inrate / outrate) << IDEAL_RATIO_DECIMAL_DEPTH;
208
209 /* ... and then the 26 depth decimal part */
210 inrate %= outrate;
211
212 for (i = 1; i <= IDEAL_RATIO_DECIMAL_DEPTH; i++) {
213 inrate <<= 1;
214
215 if (inrate < outrate)
216 continue;
217
218 ratio |= 1 << (IDEAL_RATIO_DECIMAL_DEPTH - i);
219 inrate -= outrate;
220
221 if (!inrate)
222 break;
223 }
224
225 regmap_write(asrc_priv->regmap, REG_ASRIDRL(index), ratio);
226 regmap_write(asrc_priv->regmap, REG_ASRIDRH(index), ratio >> 24);
227
228 return 0;
229 }
230
231 /**
232 * Configure the assigned ASRC pair
233 *
234 * It configures those ASRC registers according to a configuration instance
235 * of struct asrc_config which includes in/output sample rate, width, channel
236 * and clock settings.
237 */
238 static int fsl_asrc_config_pair(struct fsl_asrc_pair *pair)
239 {
240 struct asrc_config *config = pair->config;
241 struct fsl_asrc *asrc_priv = pair->asrc_priv;
242 enum asrc_pair_index index = pair->index;
243 u32 inrate, outrate, indiv, outdiv;
244 u32 clk_index[2], div[2];
245 int in, out, channels;
246 struct clk *clk;
247 bool ideal;
248
249 if (!config) {
250 pair_err("invalid pair config\n");
251 return -EINVAL;
252 }
253
254 /* Validate channels */
255 if (config->channel_num < 1 || config->channel_num > 10) {
256 pair_err("does not support %d channels\n", config->channel_num);
257 return -EINVAL;
258 }
259
260 /* Validate output width */
261 if (config->output_word_width == ASRC_WIDTH_8_BIT) {
262 pair_err("does not support 8bit width output\n");
263 return -EINVAL;
264 }
265
266 inrate = config->input_sample_rate;
267 outrate = config->output_sample_rate;
268 ideal = config->inclk == INCLK_NONE;
269
270 /* Validate input and output sample rates */
271 for (in = 0; in < ARRAY_SIZE(supported_input_rate); in++)
272 if (inrate == supported_input_rate[in])
273 break;
274
275 if (in == ARRAY_SIZE(supported_input_rate)) {
276 pair_err("unsupported input sample rate: %dHz\n", inrate);
277 return -EINVAL;
278 }
279
280 for (out = 0; out < ARRAY_SIZE(supported_asrc_rate); out++)
281 if (outrate == supported_asrc_rate[out])
282 break;
283
284 if (out == ARRAY_SIZE(supported_asrc_rate)) {
285 pair_err("unsupported output sample rate: %dHz\n", outrate);
286 return -EINVAL;
287 }
288
289 if ((outrate > 8000 && outrate < 30000) &&
290 (outrate/inrate > 24 || inrate/outrate > 8)) {
291 pair_err("exceed supported ratio range [1/24, 8] for \
292 inrate/outrate: %d/%d\n", inrate, outrate);
293 return -EINVAL;
294 }
295
296 /* Validate input and output clock sources */
297 clk_index[IN] = clk_map[IN][config->inclk];
298 clk_index[OUT] = clk_map[OUT][config->outclk];
299
300 /* We only have output clock for ideal ratio mode */
301 clk = asrc_priv->asrck_clk[clk_index[ideal ? OUT : IN]];
302
303 div[IN] = clk_get_rate(clk) / inrate;
304 if (div[IN] == 0) {
305 pair_err("failed to support input sample rate %dHz by asrck_%x\n",
306 inrate, clk_index[ideal ? OUT : IN]);
307 return -EINVAL;
308 }
309
310 clk = asrc_priv->asrck_clk[clk_index[OUT]];
311
312 /* Use fixed output rate for Ideal Ratio mode (INCLK_NONE) */
313 if (ideal)
314 div[OUT] = clk_get_rate(clk) / IDEAL_RATIO_RATE;
315 else
316 div[OUT] = clk_get_rate(clk) / outrate;
317
318 if (div[OUT] == 0) {
319 pair_err("failed to support output sample rate %dHz by asrck_%x\n",
320 outrate, clk_index[OUT]);
321 return -EINVAL;
322 }
323
324 /* Set the channel number */
325 channels = config->channel_num;
326
327 if (asrc_priv->channel_bits < 4)
328 channels /= 2;
329
330 /* Update channels for current pair */
331 regmap_update_bits(asrc_priv->regmap, REG_ASRCNCR,
332 ASRCNCR_ANCi_MASK(index, asrc_priv->channel_bits),
333 ASRCNCR_ANCi(index, channels, asrc_priv->channel_bits));
334
335 /* Default setting: Automatic selection for processing mode */
336 regmap_update_bits(asrc_priv->regmap, REG_ASRCTR,
337 ASRCTR_ATSi_MASK(index), ASRCTR_ATS(index));
338 regmap_update_bits(asrc_priv->regmap, REG_ASRCTR,
339 ASRCTR_USRi_MASK(index), 0);
340
341 /* Set the input and output clock sources */
342 regmap_update_bits(asrc_priv->regmap, REG_ASRCSR,
343 ASRCSR_AICSi_MASK(index) | ASRCSR_AOCSi_MASK(index),
344 ASRCSR_AICS(index, clk_index[IN]) |
345 ASRCSR_AOCS(index, clk_index[OUT]));
346
347 /* Calculate the input clock divisors */
348 indiv = fsl_asrc_cal_asrck_divisor(pair, div[IN]);
349 outdiv = fsl_asrc_cal_asrck_divisor(pair, div[OUT]);
350
351 /* Suppose indiv and outdiv includes prescaler, so add its MASK too */
352 regmap_update_bits(asrc_priv->regmap, REG_ASRCDR(index),
353 ASRCDRi_AOCPi_MASK(index) | ASRCDRi_AICPi_MASK(index) |
354 ASRCDRi_AOCDi_MASK(index) | ASRCDRi_AICDi_MASK(index),
355 ASRCDRi_AOCP(index, outdiv) | ASRCDRi_AICP(index, indiv));
356
357 /* Implement word_width configurations */
358 regmap_update_bits(asrc_priv->regmap, REG_ASRMCR1(index),
359 ASRMCR1i_OW16_MASK | ASRMCR1i_IWD_MASK,
360 ASRMCR1i_OW16(config->output_word_width) |
361 ASRMCR1i_IWD(config->input_word_width));
362
363 /* Enable BUFFER STALL */
364 regmap_update_bits(asrc_priv->regmap, REG_ASRMCR(index),
365 ASRMCRi_BUFSTALLi_MASK, ASRMCRi_BUFSTALLi);
366
367 /* Set default thresholds for input and output FIFO */
368 fsl_asrc_set_watermarks(pair, ASRC_INPUTFIFO_THRESHOLD,
369 ASRC_INPUTFIFO_THRESHOLD);
370
371 /* Configure the followings only for Ideal Ratio mode */
372 if (!ideal)
373 return 0;
374
375 /* Clear ASTSx bit to use Ideal Ratio mode */
376 regmap_update_bits(asrc_priv->regmap, REG_ASRCTR,
377 ASRCTR_ATSi_MASK(index), 0);
378
379 /* Enable Ideal Ratio mode */
380 regmap_update_bits(asrc_priv->regmap, REG_ASRCTR,
381 ASRCTR_IDRi_MASK(index) | ASRCTR_USRi_MASK(index),
382 ASRCTR_IDR(index) | ASRCTR_USR(index));
383
384 /* Apply configurations for pre- and post-processing */
385 regmap_update_bits(asrc_priv->regmap, REG_ASRCFG,
386 ASRCFG_PREMODi_MASK(index) | ASRCFG_POSTMODi_MASK(index),
387 ASRCFG_PREMOD(index, process_option[in][out][0]) |
388 ASRCFG_POSTMOD(index, process_option[in][out][1]));
389
390 return fsl_asrc_set_ideal_ratio(pair, inrate, outrate);
391 }
392
393 /**
394 * Start the assigned ASRC pair
395 *
396 * It enables the assigned pair and makes it stopped at the stall level.
397 */
398 static void fsl_asrc_start_pair(struct fsl_asrc_pair *pair)
399 {
400 struct fsl_asrc *asrc_priv = pair->asrc_priv;
401 enum asrc_pair_index index = pair->index;
402 int reg, retry = 10, i;
403
404 /* Enable the current pair */
405 regmap_update_bits(asrc_priv->regmap, REG_ASRCTR,
406 ASRCTR_ASRCEi_MASK(index), ASRCTR_ASRCE(index));
407
408 /* Wait for status of initialization */
409 do {
410 udelay(5);
411 regmap_read(asrc_priv->regmap, REG_ASRCFG, &reg);
412 reg &= ASRCFG_INIRQi_MASK(index);
413 } while (!reg && --retry);
414
415 /* Make the input fifo to ASRC STALL level */
416 regmap_read(asrc_priv->regmap, REG_ASRCNCR, &reg);
417 for (i = 0; i < pair->channels * 4; i++)
418 regmap_write(asrc_priv->regmap, REG_ASRDI(index), 0);
419
420 /* Enable overload interrupt */
421 regmap_write(asrc_priv->regmap, REG_ASRIER, ASRIER_AOLIE);
422 }
423
424 /**
425 * Stop the assigned ASRC pair
426 */
427 static void fsl_asrc_stop_pair(struct fsl_asrc_pair *pair)
428 {
429 struct fsl_asrc *asrc_priv = pair->asrc_priv;
430 enum asrc_pair_index index = pair->index;
431
432 /* Stop the current pair */
433 regmap_update_bits(asrc_priv->regmap, REG_ASRCTR,
434 ASRCTR_ASRCEi_MASK(index), 0);
435 }
436
437 /**
438 * Get DMA channel according to the pair and direction.
439 */
440 struct dma_chan *fsl_asrc_get_dma_channel(struct fsl_asrc_pair *pair, bool dir)
441 {
442 struct fsl_asrc *asrc_priv = pair->asrc_priv;
443 enum asrc_pair_index index = pair->index;
444 char name[4];
445
446 sprintf(name, "%cx%c", dir == IN ? 'r' : 't', index + 'a');
447
448 return dma_request_slave_channel(&asrc_priv->pdev->dev, name);
449 }
450 EXPORT_SYMBOL_GPL(fsl_asrc_get_dma_channel);
451
452 static int fsl_asrc_dai_hw_params(struct snd_pcm_substream *substream,
453 struct snd_pcm_hw_params *params,
454 struct snd_soc_dai *dai)
455 {
456 struct fsl_asrc *asrc_priv = snd_soc_dai_get_drvdata(dai);
457 int width = params_width(params);
458 struct snd_pcm_runtime *runtime = substream->runtime;
459 struct fsl_asrc_pair *pair = runtime->private_data;
460 unsigned int channels = params_channels(params);
461 unsigned int rate = params_rate(params);
462 struct asrc_config config;
463 int word_width, ret;
464
465 ret = fsl_asrc_request_pair(channels, pair);
466 if (ret) {
467 dev_err(dai->dev, "fail to request asrc pair\n");
468 return ret;
469 }
470
471 pair->config = &config;
472
473 if (width == 16)
474 width = ASRC_WIDTH_16_BIT;
475 else
476 width = ASRC_WIDTH_24_BIT;
477
478 if (asrc_priv->asrc_width == 16)
479 word_width = ASRC_WIDTH_16_BIT;
480 else
481 word_width = ASRC_WIDTH_24_BIT;
482
483 config.pair = pair->index;
484 config.channel_num = channels;
485 config.inclk = INCLK_NONE;
486 config.outclk = OUTCLK_ASRCK1_CLK;
487
488 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
489 config.input_word_width = width;
490 config.output_word_width = word_width;
491 config.input_sample_rate = rate;
492 config.output_sample_rate = asrc_priv->asrc_rate;
493 } else {
494 config.input_word_width = word_width;
495 config.output_word_width = width;
496 config.input_sample_rate = asrc_priv->asrc_rate;
497 config.output_sample_rate = rate;
498 }
499
500 ret = fsl_asrc_config_pair(pair);
501 if (ret) {
502 dev_err(dai->dev, "fail to config asrc pair\n");
503 return ret;
504 }
505
506 return 0;
507 }
508
509 static int fsl_asrc_dai_hw_free(struct snd_pcm_substream *substream,
510 struct snd_soc_dai *dai)
511 {
512 struct snd_pcm_runtime *runtime = substream->runtime;
513 struct fsl_asrc_pair *pair = runtime->private_data;
514
515 if (pair)
516 fsl_asrc_release_pair(pair);
517
518 return 0;
519 }
520
521 static int fsl_asrc_dai_trigger(struct snd_pcm_substream *substream, int cmd,
522 struct snd_soc_dai *dai)
523 {
524 struct snd_pcm_runtime *runtime = substream->runtime;
525 struct fsl_asrc_pair *pair = runtime->private_data;
526
527 switch (cmd) {
528 case SNDRV_PCM_TRIGGER_START:
529 case SNDRV_PCM_TRIGGER_RESUME:
530 case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
531 fsl_asrc_start_pair(pair);
532 break;
533 case SNDRV_PCM_TRIGGER_STOP:
534 case SNDRV_PCM_TRIGGER_SUSPEND:
535 case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
536 fsl_asrc_stop_pair(pair);
537 break;
538 default:
539 return -EINVAL;
540 }
541
542 return 0;
543 }
544
545 static struct snd_soc_dai_ops fsl_asrc_dai_ops = {
546 .hw_params = fsl_asrc_dai_hw_params,
547 .hw_free = fsl_asrc_dai_hw_free,
548 .trigger = fsl_asrc_dai_trigger,
549 };
550
551 static int fsl_asrc_dai_probe(struct snd_soc_dai *dai)
552 {
553 struct fsl_asrc *asrc_priv = snd_soc_dai_get_drvdata(dai);
554
555 snd_soc_dai_init_dma_data(dai, &asrc_priv->dma_params_tx,
556 &asrc_priv->dma_params_rx);
557
558 return 0;
559 }
560
561 #define FSL_ASRC_RATES SNDRV_PCM_RATE_8000_192000
562 #define FSL_ASRC_FORMATS (SNDRV_PCM_FMTBIT_S24_LE | \
563 SNDRV_PCM_FMTBIT_S16_LE | \
564 SNDRV_PCM_FMTBIT_S20_3LE)
565
566 static struct snd_soc_dai_driver fsl_asrc_dai = {
567 .probe = fsl_asrc_dai_probe,
568 .playback = {
569 .stream_name = "ASRC-Playback",
570 .channels_min = 1,
571 .channels_max = 10,
572 .rates = FSL_ASRC_RATES,
573 .formats = FSL_ASRC_FORMATS,
574 },
575 .capture = {
576 .stream_name = "ASRC-Capture",
577 .channels_min = 1,
578 .channels_max = 10,
579 .rates = FSL_ASRC_RATES,
580 .formats = FSL_ASRC_FORMATS,
581 },
582 .ops = &fsl_asrc_dai_ops,
583 };
584
585 static const struct snd_soc_component_driver fsl_asrc_component = {
586 .name = "fsl-asrc-dai",
587 };
588
589 static bool fsl_asrc_readable_reg(struct device *dev, unsigned int reg)
590 {
591 switch (reg) {
592 case REG_ASRCTR:
593 case REG_ASRIER:
594 case REG_ASRCNCR:
595 case REG_ASRCFG:
596 case REG_ASRCSR:
597 case REG_ASRCDR1:
598 case REG_ASRCDR2:
599 case REG_ASRSTR:
600 case REG_ASRPM1:
601 case REG_ASRPM2:
602 case REG_ASRPM3:
603 case REG_ASRPM4:
604 case REG_ASRPM5:
605 case REG_ASRTFR1:
606 case REG_ASRCCR:
607 case REG_ASRDOA:
608 case REG_ASRDOB:
609 case REG_ASRDOC:
610 case REG_ASRIDRHA:
611 case REG_ASRIDRLA:
612 case REG_ASRIDRHB:
613 case REG_ASRIDRLB:
614 case REG_ASRIDRHC:
615 case REG_ASRIDRLC:
616 case REG_ASR76K:
617 case REG_ASR56K:
618 case REG_ASRMCRA:
619 case REG_ASRFSTA:
620 case REG_ASRMCRB:
621 case REG_ASRFSTB:
622 case REG_ASRMCRC:
623 case REG_ASRFSTC:
624 case REG_ASRMCR1A:
625 case REG_ASRMCR1B:
626 case REG_ASRMCR1C:
627 return true;
628 default:
629 return false;
630 }
631 }
632
633 static bool fsl_asrc_volatile_reg(struct device *dev, unsigned int reg)
634 {
635 switch (reg) {
636 case REG_ASRSTR:
637 case REG_ASRDIA:
638 case REG_ASRDIB:
639 case REG_ASRDIC:
640 case REG_ASRDOA:
641 case REG_ASRDOB:
642 case REG_ASRDOC:
643 case REG_ASRFSTA:
644 case REG_ASRFSTB:
645 case REG_ASRFSTC:
646 case REG_ASRCFG:
647 return true;
648 default:
649 return false;
650 }
651 }
652
653 static bool fsl_asrc_writeable_reg(struct device *dev, unsigned int reg)
654 {
655 switch (reg) {
656 case REG_ASRCTR:
657 case REG_ASRIER:
658 case REG_ASRCNCR:
659 case REG_ASRCFG:
660 case REG_ASRCSR:
661 case REG_ASRCDR1:
662 case REG_ASRCDR2:
663 case REG_ASRSTR:
664 case REG_ASRPM1:
665 case REG_ASRPM2:
666 case REG_ASRPM3:
667 case REG_ASRPM4:
668 case REG_ASRPM5:
669 case REG_ASRTFR1:
670 case REG_ASRCCR:
671 case REG_ASRDIA:
672 case REG_ASRDIB:
673 case REG_ASRDIC:
674 case REG_ASRIDRHA:
675 case REG_ASRIDRLA:
676 case REG_ASRIDRHB:
677 case REG_ASRIDRLB:
678 case REG_ASRIDRHC:
679 case REG_ASRIDRLC:
680 case REG_ASR76K:
681 case REG_ASR56K:
682 case REG_ASRMCRA:
683 case REG_ASRMCRB:
684 case REG_ASRMCRC:
685 case REG_ASRMCR1A:
686 case REG_ASRMCR1B:
687 case REG_ASRMCR1C:
688 return true;
689 default:
690 return false;
691 }
692 }
693
694 static struct reg_default fsl_asrc_reg[] = {
695 { REG_ASRCTR, 0x0000 }, { REG_ASRIER, 0x0000 },
696 { REG_ASRCNCR, 0x0000 }, { REG_ASRCFG, 0x0000 },
697 { REG_ASRCSR, 0x0000 }, { REG_ASRCDR1, 0x0000 },
698 { REG_ASRCDR2, 0x0000 }, { REG_ASRSTR, 0x0000 },
699 { REG_ASRRA, 0x0000 }, { REG_ASRRB, 0x0000 },
700 { REG_ASRRC, 0x0000 }, { REG_ASRPM1, 0x0000 },
701 { REG_ASRPM2, 0x0000 }, { REG_ASRPM3, 0x0000 },
702 { REG_ASRPM4, 0x0000 }, { REG_ASRPM5, 0x0000 },
703 { REG_ASRTFR1, 0x0000 }, { REG_ASRCCR, 0x0000 },
704 { REG_ASRDIA, 0x0000 }, { REG_ASRDOA, 0x0000 },
705 { REG_ASRDIB, 0x0000 }, { REG_ASRDOB, 0x0000 },
706 { REG_ASRDIC, 0x0000 }, { REG_ASRDOC, 0x0000 },
707 { REG_ASRIDRHA, 0x0000 }, { REG_ASRIDRLA, 0x0000 },
708 { REG_ASRIDRHB, 0x0000 }, { REG_ASRIDRLB, 0x0000 },
709 { REG_ASRIDRHC, 0x0000 }, { REG_ASRIDRLC, 0x0000 },
710 { REG_ASR76K, 0x0A47 }, { REG_ASR56K, 0x0DF3 },
711 { REG_ASRMCRA, 0x0000 }, { REG_ASRFSTA, 0x0000 },
712 { REG_ASRMCRB, 0x0000 }, { REG_ASRFSTB, 0x0000 },
713 { REG_ASRMCRC, 0x0000 }, { REG_ASRFSTC, 0x0000 },
714 { REG_ASRMCR1A, 0x0000 }, { REG_ASRMCR1B, 0x0000 },
715 { REG_ASRMCR1C, 0x0000 },
716 };
717
718 static const struct regmap_config fsl_asrc_regmap_config = {
719 .reg_bits = 32,
720 .reg_stride = 4,
721 .val_bits = 32,
722
723 .max_register = REG_ASRMCR1C,
724 .reg_defaults = fsl_asrc_reg,
725 .num_reg_defaults = ARRAY_SIZE(fsl_asrc_reg),
726 .readable_reg = fsl_asrc_readable_reg,
727 .volatile_reg = fsl_asrc_volatile_reg,
728 .writeable_reg = fsl_asrc_writeable_reg,
729 .cache_type = REGCACHE_RBTREE,
730 };
731
732 /**
733 * Initialize ASRC registers with a default configurations
734 */
735 static int fsl_asrc_init(struct fsl_asrc *asrc_priv)
736 {
737 /* Halt ASRC internal FP when input FIFO needs data for pair A, B, C */
738 regmap_write(asrc_priv->regmap, REG_ASRCTR, ASRCTR_ASRCEN);
739
740 /* Disable interrupt by default */
741 regmap_write(asrc_priv->regmap, REG_ASRIER, 0x0);
742
743 /* Apply recommended settings for parameters from Reference Manual */
744 regmap_write(asrc_priv->regmap, REG_ASRPM1, 0x7fffff);
745 regmap_write(asrc_priv->regmap, REG_ASRPM2, 0x255555);
746 regmap_write(asrc_priv->regmap, REG_ASRPM3, 0xff7280);
747 regmap_write(asrc_priv->regmap, REG_ASRPM4, 0xff7280);
748 regmap_write(asrc_priv->regmap, REG_ASRPM5, 0xff7280);
749
750 /* Base address for task queue FIFO. Set to 0x7C */
751 regmap_update_bits(asrc_priv->regmap, REG_ASRTFR1,
752 ASRTFR1_TF_BASE_MASK, ASRTFR1_TF_BASE(0xfc));
753
754 /* Set the processing clock for 76KHz to 133M */
755 regmap_write(asrc_priv->regmap, REG_ASR76K, 0x06D6);
756
757 /* Set the processing clock for 56KHz to 133M */
758 return regmap_write(asrc_priv->regmap, REG_ASR56K, 0x0947);
759 }
760
761 /**
762 * Interrupt handler for ASRC
763 */
764 static irqreturn_t fsl_asrc_isr(int irq, void *dev_id)
765 {
766 struct fsl_asrc *asrc_priv = (struct fsl_asrc *)dev_id;
767 struct device *dev = &asrc_priv->pdev->dev;
768 enum asrc_pair_index index;
769 u32 status;
770
771 regmap_read(asrc_priv->regmap, REG_ASRSTR, &status);
772
773 /* Clean overload error */
774 regmap_write(asrc_priv->regmap, REG_ASRSTR, ASRSTR_AOLE);
775
776 /*
777 * We here use dev_dbg() for all exceptions because ASRC itself does
778 * not care if FIFO overflowed or underrun while a warning in the
779 * interrupt would result a ridged conversion.
780 */
781 for (index = ASRC_PAIR_A; index < ASRC_PAIR_MAX_NUM; index++) {
782 if (!asrc_priv->pair[index])
783 continue;
784
785 if (status & ASRSTR_ATQOL) {
786 asrc_priv->pair[index]->error |= ASRC_TASK_Q_OVERLOAD;
787 dev_dbg(dev, "ASRC Task Queue FIFO overload\n");
788 }
789
790 if (status & ASRSTR_AOOL(index)) {
791 asrc_priv->pair[index]->error |= ASRC_OUTPUT_TASK_OVERLOAD;
792 pair_dbg("Output Task Overload\n");
793 }
794
795 if (status & ASRSTR_AIOL(index)) {
796 asrc_priv->pair[index]->error |= ASRC_INPUT_TASK_OVERLOAD;
797 pair_dbg("Input Task Overload\n");
798 }
799
800 if (status & ASRSTR_AODO(index)) {
801 asrc_priv->pair[index]->error |= ASRC_OUTPUT_BUFFER_OVERFLOW;
802 pair_dbg("Output Data Buffer has overflowed\n");
803 }
804
805 if (status & ASRSTR_AIDU(index)) {
806 asrc_priv->pair[index]->error |= ASRC_INPUT_BUFFER_UNDERRUN;
807 pair_dbg("Input Data Buffer has underflowed\n");
808 }
809 }
810
811 return IRQ_HANDLED;
812 }
813
814 static int fsl_asrc_probe(struct platform_device *pdev)
815 {
816 struct device_node *np = pdev->dev.of_node;
817 struct fsl_asrc *asrc_priv;
818 struct resource *res;
819 void __iomem *regs;
820 int irq, ret, i;
821 char tmp[16];
822
823 asrc_priv = devm_kzalloc(&pdev->dev, sizeof(*asrc_priv), GFP_KERNEL);
824 if (!asrc_priv)
825 return -ENOMEM;
826
827 asrc_priv->pdev = pdev;
828
829 /* Get the addresses and IRQ */
830 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
831 regs = devm_ioremap_resource(&pdev->dev, res);
832 if (IS_ERR(regs))
833 return PTR_ERR(regs);
834
835 asrc_priv->paddr = res->start;
836
837 asrc_priv->regmap = devm_regmap_init_mmio_clk(&pdev->dev, "mem", regs,
838 &fsl_asrc_regmap_config);
839 if (IS_ERR(asrc_priv->regmap)) {
840 dev_err(&pdev->dev, "failed to init regmap\n");
841 return PTR_ERR(asrc_priv->regmap);
842 }
843
844 irq = platform_get_irq(pdev, 0);
845 if (irq < 0) {
846 dev_err(&pdev->dev, "no irq for node %s\n", pdev->name);
847 return irq;
848 }
849
850 ret = devm_request_irq(&pdev->dev, irq, fsl_asrc_isr, 0,
851 dev_name(&pdev->dev), asrc_priv);
852 if (ret) {
853 dev_err(&pdev->dev, "failed to claim irq %u: %d\n", irq, ret);
854 return ret;
855 }
856
857 asrc_priv->mem_clk = devm_clk_get(&pdev->dev, "mem");
858 if (IS_ERR(asrc_priv->mem_clk)) {
859 dev_err(&pdev->dev, "failed to get mem clock\n");
860 return PTR_ERR(asrc_priv->mem_clk);
861 }
862
863 asrc_priv->ipg_clk = devm_clk_get(&pdev->dev, "ipg");
864 if (IS_ERR(asrc_priv->ipg_clk)) {
865 dev_err(&pdev->dev, "failed to get ipg clock\n");
866 return PTR_ERR(asrc_priv->ipg_clk);
867 }
868
869 asrc_priv->spba_clk = devm_clk_get(&pdev->dev, "spba");
870 if (IS_ERR(asrc_priv->spba_clk))
871 dev_warn(&pdev->dev, "failed to get spba clock\n");
872
873 for (i = 0; i < ASRC_CLK_MAX_NUM; i++) {
874 sprintf(tmp, "asrck_%x", i);
875 asrc_priv->asrck_clk[i] = devm_clk_get(&pdev->dev, tmp);
876 if (IS_ERR(asrc_priv->asrck_clk[i])) {
877 dev_err(&pdev->dev, "failed to get %s clock\n", tmp);
878 return PTR_ERR(asrc_priv->asrck_clk[i]);
879 }
880 }
881
882 if (of_device_is_compatible(np, "fsl,imx35-asrc")) {
883 asrc_priv->channel_bits = 3;
884 clk_map[IN] = input_clk_map_imx35;
885 clk_map[OUT] = output_clk_map_imx35;
886 } else {
887 asrc_priv->channel_bits = 4;
888 clk_map[IN] = input_clk_map_imx53;
889 clk_map[OUT] = output_clk_map_imx53;
890 }
891
892 ret = fsl_asrc_init(asrc_priv);
893 if (ret) {
894 dev_err(&pdev->dev, "failed to init asrc %d\n", ret);
895 return ret;
896 }
897
898 asrc_priv->channel_avail = 10;
899
900 ret = of_property_read_u32(np, "fsl,asrc-rate",
901 &asrc_priv->asrc_rate);
902 if (ret) {
903 dev_err(&pdev->dev, "failed to get output rate\n");
904 return ret;
905 }
906
907 ret = of_property_read_u32(np, "fsl,asrc-width",
908 &asrc_priv->asrc_width);
909 if (ret) {
910 dev_err(&pdev->dev, "failed to get output width\n");
911 return ret;
912 }
913
914 if (asrc_priv->asrc_width != 16 && asrc_priv->asrc_width != 24) {
915 dev_warn(&pdev->dev, "unsupported width, switching to 24bit\n");
916 asrc_priv->asrc_width = 24;
917 }
918
919 platform_set_drvdata(pdev, asrc_priv);
920 pm_runtime_enable(&pdev->dev);
921 spin_lock_init(&asrc_priv->lock);
922
923 ret = devm_snd_soc_register_component(&pdev->dev, &fsl_asrc_component,
924 &fsl_asrc_dai, 1);
925 if (ret) {
926 dev_err(&pdev->dev, "failed to register ASoC DAI\n");
927 return ret;
928 }
929
930 ret = devm_snd_soc_register_platform(&pdev->dev, &fsl_asrc_platform);
931 if (ret) {
932 dev_err(&pdev->dev, "failed to register ASoC platform\n");
933 return ret;
934 }
935
936 return 0;
937 }
938
939 #ifdef CONFIG_PM
940 static int fsl_asrc_runtime_resume(struct device *dev)
941 {
942 struct fsl_asrc *asrc_priv = dev_get_drvdata(dev);
943 int i, ret;
944
945 ret = clk_prepare_enable(asrc_priv->mem_clk);
946 if (ret)
947 return ret;
948 ret = clk_prepare_enable(asrc_priv->ipg_clk);
949 if (ret)
950 goto disable_mem_clk;
951 if (!IS_ERR(asrc_priv->spba_clk)) {
952 ret = clk_prepare_enable(asrc_priv->spba_clk);
953 if (ret)
954 goto disable_ipg_clk;
955 }
956 for (i = 0; i < ASRC_CLK_MAX_NUM; i++) {
957 ret = clk_prepare_enable(asrc_priv->asrck_clk[i]);
958 if (ret)
959 goto disable_asrck_clk;
960 }
961
962 return 0;
963
964 disable_asrck_clk:
965 for (i--; i >= 0; i--)
966 clk_disable_unprepare(asrc_priv->asrck_clk[i]);
967 if (!IS_ERR(asrc_priv->spba_clk))
968 clk_disable_unprepare(asrc_priv->spba_clk);
969 disable_ipg_clk:
970 clk_disable_unprepare(asrc_priv->ipg_clk);
971 disable_mem_clk:
972 clk_disable_unprepare(asrc_priv->mem_clk);
973 return ret;
974 }
975
976 static int fsl_asrc_runtime_suspend(struct device *dev)
977 {
978 struct fsl_asrc *asrc_priv = dev_get_drvdata(dev);
979 int i;
980
981 for (i = 0; i < ASRC_CLK_MAX_NUM; i++)
982 clk_disable_unprepare(asrc_priv->asrck_clk[i]);
983 if (!IS_ERR(asrc_priv->spba_clk))
984 clk_disable_unprepare(asrc_priv->spba_clk);
985 clk_disable_unprepare(asrc_priv->ipg_clk);
986 clk_disable_unprepare(asrc_priv->mem_clk);
987
988 return 0;
989 }
990 #endif /* CONFIG_PM */
991
992 #ifdef CONFIG_PM_SLEEP
993 static int fsl_asrc_suspend(struct device *dev)
994 {
995 struct fsl_asrc *asrc_priv = dev_get_drvdata(dev);
996
997 regmap_read(asrc_priv->regmap, REG_ASRCFG,
998 &asrc_priv->regcache_cfg);
999
1000 regcache_cache_only(asrc_priv->regmap, true);
1001 regcache_mark_dirty(asrc_priv->regmap);
1002
1003 return 0;
1004 }
1005
1006 static int fsl_asrc_resume(struct device *dev)
1007 {
1008 struct fsl_asrc *asrc_priv = dev_get_drvdata(dev);
1009 u32 asrctr;
1010
1011 /* Stop all pairs provisionally */
1012 regmap_read(asrc_priv->regmap, REG_ASRCTR, &asrctr);
1013 regmap_update_bits(asrc_priv->regmap, REG_ASRCTR,
1014 ASRCTR_ASRCEi_ALL_MASK, 0);
1015
1016 /* Restore all registers */
1017 regcache_cache_only(asrc_priv->regmap, false);
1018 regcache_sync(asrc_priv->regmap);
1019
1020 regmap_update_bits(asrc_priv->regmap, REG_ASRCFG,
1021 ASRCFG_NDPRi_ALL_MASK | ASRCFG_POSTMODi_ALL_MASK |
1022 ASRCFG_PREMODi_ALL_MASK, asrc_priv->regcache_cfg);
1023
1024 /* Restart enabled pairs */
1025 regmap_update_bits(asrc_priv->regmap, REG_ASRCTR,
1026 ASRCTR_ASRCEi_ALL_MASK, asrctr);
1027
1028 return 0;
1029 }
1030 #endif /* CONFIG_PM_SLEEP */
1031
1032 static const struct dev_pm_ops fsl_asrc_pm = {
1033 SET_RUNTIME_PM_OPS(fsl_asrc_runtime_suspend, fsl_asrc_runtime_resume, NULL)
1034 SET_SYSTEM_SLEEP_PM_OPS(fsl_asrc_suspend, fsl_asrc_resume)
1035 };
1036
1037 static const struct of_device_id fsl_asrc_ids[] = {
1038 { .compatible = "fsl,imx35-asrc", },
1039 { .compatible = "fsl,imx53-asrc", },
1040 {}
1041 };
1042 MODULE_DEVICE_TABLE(of, fsl_asrc_ids);
1043
1044 static struct platform_driver fsl_asrc_driver = {
1045 .probe = fsl_asrc_probe,
1046 .driver = {
1047 .name = "fsl-asrc",
1048 .of_match_table = fsl_asrc_ids,
1049 .pm = &fsl_asrc_pm,
1050 },
1051 };
1052 module_platform_driver(fsl_asrc_driver);
1053
1054 MODULE_DESCRIPTION("Freescale ASRC ASoC driver");
1055 MODULE_AUTHOR("Nicolin Chen <nicoleotsuka@gmail.com>");
1056 MODULE_ALIAS("platform:fsl-asrc");
1057 MODULE_LICENSE("GPL v2");
Linux kernel - Deliverables
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