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 following 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, ®); 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, ®); 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 const 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 bool fsl_asrc_readable_reg(struct device *dev, unsigned int reg) 586 { 587 switch (reg) { 588 case REG_ASRCTR: 589 case REG_ASRIER: 590 case REG_ASRCNCR: 591 case REG_ASRCFG: 592 case REG_ASRCSR: 593 case REG_ASRCDR1: 594 case REG_ASRCDR2: 595 case REG_ASRSTR: 596 case REG_ASRPM1: 597 case REG_ASRPM2: 598 case REG_ASRPM3: 599 case REG_ASRPM4: 600 case REG_ASRPM5: 601 case REG_ASRTFR1: 602 case REG_ASRCCR: 603 case REG_ASRDOA: 604 case REG_ASRDOB: 605 case REG_ASRDOC: 606 case REG_ASRIDRHA: 607 case REG_ASRIDRLA: 608 case REG_ASRIDRHB: 609 case REG_ASRIDRLB: 610 case REG_ASRIDRHC: 611 case REG_ASRIDRLC: 612 case REG_ASR76K: 613 case REG_ASR56K: 614 case REG_ASRMCRA: 615 case REG_ASRFSTA: 616 case REG_ASRMCRB: 617 case REG_ASRFSTB: 618 case REG_ASRMCRC: 619 case REG_ASRFSTC: 620 case REG_ASRMCR1A: 621 case REG_ASRMCR1B: 622 case REG_ASRMCR1C: 623 return true; 624 default: 625 return false; 626 } 627 } 628 629 static bool fsl_asrc_volatile_reg(struct device *dev, unsigned int reg) 630 { 631 switch (reg) { 632 case REG_ASRSTR: 633 case REG_ASRDIA: 634 case REG_ASRDIB: 635 case REG_ASRDIC: 636 case REG_ASRDOA: 637 case REG_ASRDOB: 638 case REG_ASRDOC: 639 case REG_ASRFSTA: 640 case REG_ASRFSTB: 641 case REG_ASRFSTC: 642 case REG_ASRCFG: 643 return true; 644 default: 645 return false; 646 } 647 } 648 649 static bool fsl_asrc_writeable_reg(struct device *dev, unsigned int reg) 650 { 651 switch (reg) { 652 case REG_ASRCTR: 653 case REG_ASRIER: 654 case REG_ASRCNCR: 655 case REG_ASRCFG: 656 case REG_ASRCSR: 657 case REG_ASRCDR1: 658 case REG_ASRCDR2: 659 case REG_ASRSTR: 660 case REG_ASRPM1: 661 case REG_ASRPM2: 662 case REG_ASRPM3: 663 case REG_ASRPM4: 664 case REG_ASRPM5: 665 case REG_ASRTFR1: 666 case REG_ASRCCR: 667 case REG_ASRDIA: 668 case REG_ASRDIB: 669 case REG_ASRDIC: 670 case REG_ASRIDRHA: 671 case REG_ASRIDRLA: 672 case REG_ASRIDRHB: 673 case REG_ASRIDRLB: 674 case REG_ASRIDRHC: 675 case REG_ASRIDRLC: 676 case REG_ASR76K: 677 case REG_ASR56K: 678 case REG_ASRMCRA: 679 case REG_ASRMCRB: 680 case REG_ASRMCRC: 681 case REG_ASRMCR1A: 682 case REG_ASRMCR1B: 683 case REG_ASRMCR1C: 684 return true; 685 default: 686 return false; 687 } 688 } 689 690 static struct reg_default fsl_asrc_reg[] = { 691 { REG_ASRCTR, 0x0000 }, { REG_ASRIER, 0x0000 }, 692 { REG_ASRCNCR, 0x0000 }, { REG_ASRCFG, 0x0000 }, 693 { REG_ASRCSR, 0x0000 }, { REG_ASRCDR1, 0x0000 }, 694 { REG_ASRCDR2, 0x0000 }, { REG_ASRSTR, 0x0000 }, 695 { REG_ASRRA, 0x0000 }, { REG_ASRRB, 0x0000 }, 696 { REG_ASRRC, 0x0000 }, { REG_ASRPM1, 0x0000 }, 697 { REG_ASRPM2, 0x0000 }, { REG_ASRPM3, 0x0000 }, 698 { REG_ASRPM4, 0x0000 }, { REG_ASRPM5, 0x0000 }, 699 { REG_ASRTFR1, 0x0000 }, { REG_ASRCCR, 0x0000 }, 700 { REG_ASRDIA, 0x0000 }, { REG_ASRDOA, 0x0000 }, 701 { REG_ASRDIB, 0x0000 }, { REG_ASRDOB, 0x0000 }, 702 { REG_ASRDIC, 0x0000 }, { REG_ASRDOC, 0x0000 }, 703 { REG_ASRIDRHA, 0x0000 }, { REG_ASRIDRLA, 0x0000 }, 704 { REG_ASRIDRHB, 0x0000 }, { REG_ASRIDRLB, 0x0000 }, 705 { REG_ASRIDRHC, 0x0000 }, { REG_ASRIDRLC, 0x0000 }, 706 { REG_ASR76K, 0x0A47 }, { REG_ASR56K, 0x0DF3 }, 707 { REG_ASRMCRA, 0x0000 }, { REG_ASRFSTA, 0x0000 }, 708 { REG_ASRMCRB, 0x0000 }, { REG_ASRFSTB, 0x0000 }, 709 { REG_ASRMCRC, 0x0000 }, { REG_ASRFSTC, 0x0000 }, 710 { REG_ASRMCR1A, 0x0000 }, { REG_ASRMCR1B, 0x0000 }, 711 { REG_ASRMCR1C, 0x0000 }, 712 }; 713 714 static const struct regmap_config fsl_asrc_regmap_config = { 715 .reg_bits = 32, 716 .reg_stride = 4, 717 .val_bits = 32, 718 719 .max_register = REG_ASRMCR1C, 720 .reg_defaults = fsl_asrc_reg, 721 .num_reg_defaults = ARRAY_SIZE(fsl_asrc_reg), 722 .readable_reg = fsl_asrc_readable_reg, 723 .volatile_reg = fsl_asrc_volatile_reg, 724 .writeable_reg = fsl_asrc_writeable_reg, 725 .cache_type = REGCACHE_FLAT, 726 }; 727 728 /** 729 * Initialize ASRC registers with a default configurations 730 */ 731 static int fsl_asrc_init(struct fsl_asrc *asrc_priv) 732 { 733 /* Halt ASRC internal FP when input FIFO needs data for pair A, B, C */ 734 regmap_write(asrc_priv->regmap, REG_ASRCTR, ASRCTR_ASRCEN); 735 736 /* Disable interrupt by default */ 737 regmap_write(asrc_priv->regmap, REG_ASRIER, 0x0); 738 739 /* Apply recommended settings for parameters from Reference Manual */ 740 regmap_write(asrc_priv->regmap, REG_ASRPM1, 0x7fffff); 741 regmap_write(asrc_priv->regmap, REG_ASRPM2, 0x255555); 742 regmap_write(asrc_priv->regmap, REG_ASRPM3, 0xff7280); 743 regmap_write(asrc_priv->regmap, REG_ASRPM4, 0xff7280); 744 regmap_write(asrc_priv->regmap, REG_ASRPM5, 0xff7280); 745 746 /* Base address for task queue FIFO. Set to 0x7C */ 747 regmap_update_bits(asrc_priv->regmap, REG_ASRTFR1, 748 ASRTFR1_TF_BASE_MASK, ASRTFR1_TF_BASE(0xfc)); 749 750 /* Set the processing clock for 76KHz to 133M */ 751 regmap_write(asrc_priv->regmap, REG_ASR76K, 0x06D6); 752 753 /* Set the processing clock for 56KHz to 133M */ 754 return regmap_write(asrc_priv->regmap, REG_ASR56K, 0x0947); 755 } 756 757 /** 758 * Interrupt handler for ASRC 759 */ 760 static irqreturn_t fsl_asrc_isr(int irq, void *dev_id) 761 { 762 struct fsl_asrc *asrc_priv = (struct fsl_asrc *)dev_id; 763 struct device *dev = &asrc_priv->pdev->dev; 764 enum asrc_pair_index index; 765 u32 status; 766 767 regmap_read(asrc_priv->regmap, REG_ASRSTR, &status); 768 769 /* Clean overload error */ 770 regmap_write(asrc_priv->regmap, REG_ASRSTR, ASRSTR_AOLE); 771 772 /* 773 * We here use dev_dbg() for all exceptions because ASRC itself does 774 * not care if FIFO overflowed or underrun while a warning in the 775 * interrupt would result a ridged conversion. 776 */ 777 for (index = ASRC_PAIR_A; index < ASRC_PAIR_MAX_NUM; index++) { 778 if (!asrc_priv->pair[index]) 779 continue; 780 781 if (status & ASRSTR_ATQOL) { 782 asrc_priv->pair[index]->error |= ASRC_TASK_Q_OVERLOAD; 783 dev_dbg(dev, "ASRC Task Queue FIFO overload\n"); 784 } 785 786 if (status & ASRSTR_AOOL(index)) { 787 asrc_priv->pair[index]->error |= ASRC_OUTPUT_TASK_OVERLOAD; 788 pair_dbg("Output Task Overload\n"); 789 } 790 791 if (status & ASRSTR_AIOL(index)) { 792 asrc_priv->pair[index]->error |= ASRC_INPUT_TASK_OVERLOAD; 793 pair_dbg("Input Task Overload\n"); 794 } 795 796 if (status & ASRSTR_AODO(index)) { 797 asrc_priv->pair[index]->error |= ASRC_OUTPUT_BUFFER_OVERFLOW; 798 pair_dbg("Output Data Buffer has overflowed\n"); 799 } 800 801 if (status & ASRSTR_AIDU(index)) { 802 asrc_priv->pair[index]->error |= ASRC_INPUT_BUFFER_UNDERRUN; 803 pair_dbg("Input Data Buffer has underflowed\n"); 804 } 805 } 806 807 return IRQ_HANDLED; 808 } 809 810 static int fsl_asrc_probe(struct platform_device *pdev) 811 { 812 struct device_node *np = pdev->dev.of_node; 813 struct fsl_asrc *asrc_priv; 814 struct resource *res; 815 void __iomem *regs; 816 int irq, ret, i; 817 char tmp[16]; 818 819 asrc_priv = devm_kzalloc(&pdev->dev, sizeof(*asrc_priv), GFP_KERNEL); 820 if (!asrc_priv) 821 return -ENOMEM; 822 823 asrc_priv->pdev = pdev; 824 825 /* Get the addresses and IRQ */ 826 res = platform_get_resource(pdev, IORESOURCE_MEM, 0); 827 regs = devm_ioremap_resource(&pdev->dev, res); 828 if (IS_ERR(regs)) 829 return PTR_ERR(regs); 830 831 asrc_priv->paddr = res->start; 832 833 asrc_priv->regmap = devm_regmap_init_mmio_clk(&pdev->dev, "mem", regs, 834 &fsl_asrc_regmap_config); 835 if (IS_ERR(asrc_priv->regmap)) { 836 dev_err(&pdev->dev, "failed to init regmap\n"); 837 return PTR_ERR(asrc_priv->regmap); 838 } 839 840 irq = platform_get_irq(pdev, 0); 841 if (irq < 0) { 842 dev_err(&pdev->dev, "no irq for node %s\n", pdev->name); 843 return irq; 844 } 845 846 ret = devm_request_irq(&pdev->dev, irq, fsl_asrc_isr, 0, 847 dev_name(&pdev->dev), asrc_priv); 848 if (ret) { 849 dev_err(&pdev->dev, "failed to claim irq %u: %d\n", irq, ret); 850 return ret; 851 } 852 853 asrc_priv->mem_clk = devm_clk_get(&pdev->dev, "mem"); 854 if (IS_ERR(asrc_priv->mem_clk)) { 855 dev_err(&pdev->dev, "failed to get mem clock\n"); 856 return PTR_ERR(asrc_priv->mem_clk); 857 } 858 859 asrc_priv->ipg_clk = devm_clk_get(&pdev->dev, "ipg"); 860 if (IS_ERR(asrc_priv->ipg_clk)) { 861 dev_err(&pdev->dev, "failed to get ipg clock\n"); 862 return PTR_ERR(asrc_priv->ipg_clk); 863 } 864 865 asrc_priv->spba_clk = devm_clk_get(&pdev->dev, "spba"); 866 if (IS_ERR(asrc_priv->spba_clk)) 867 dev_warn(&pdev->dev, "failed to get spba clock\n"); 868 869 for (i = 0; i < ASRC_CLK_MAX_NUM; i++) { 870 sprintf(tmp, "asrck_%x", i); 871 asrc_priv->asrck_clk[i] = devm_clk_get(&pdev->dev, tmp); 872 if (IS_ERR(asrc_priv->asrck_clk[i])) { 873 dev_err(&pdev->dev, "failed to get %s clock\n", tmp); 874 return PTR_ERR(asrc_priv->asrck_clk[i]); 875 } 876 } 877 878 if (of_device_is_compatible(np, "fsl,imx35-asrc")) { 879 asrc_priv->channel_bits = 3; 880 clk_map[IN] = input_clk_map_imx35; 881 clk_map[OUT] = output_clk_map_imx35; 882 } else { 883 asrc_priv->channel_bits = 4; 884 clk_map[IN] = input_clk_map_imx53; 885 clk_map[OUT] = output_clk_map_imx53; 886 } 887 888 ret = fsl_asrc_init(asrc_priv); 889 if (ret) { 890 dev_err(&pdev->dev, "failed to init asrc %d\n", ret); 891 return ret; 892 } 893 894 asrc_priv->channel_avail = 10; 895 896 ret = of_property_read_u32(np, "fsl,asrc-rate", 897 &asrc_priv->asrc_rate); 898 if (ret) { 899 dev_err(&pdev->dev, "failed to get output rate\n"); 900 return ret; 901 } 902 903 ret = of_property_read_u32(np, "fsl,asrc-width", 904 &asrc_priv->asrc_width); 905 if (ret) { 906 dev_err(&pdev->dev, "failed to get output width\n"); 907 return ret; 908 } 909 910 if (asrc_priv->asrc_width != 16 && asrc_priv->asrc_width != 24) { 911 dev_warn(&pdev->dev, "unsupported width, switching to 24bit\n"); 912 asrc_priv->asrc_width = 24; 913 } 914 915 platform_set_drvdata(pdev, asrc_priv); 916 pm_runtime_enable(&pdev->dev); 917 spin_lock_init(&asrc_priv->lock); 918 919 ret = devm_snd_soc_register_component(&pdev->dev, &fsl_asrc_component, 920 &fsl_asrc_dai, 1); 921 if (ret) { 922 dev_err(&pdev->dev, "failed to register ASoC DAI\n"); 923 return ret; 924 } 925 926 return 0; 927 } 928 929 #ifdef CONFIG_PM 930 static int fsl_asrc_runtime_resume(struct device *dev) 931 { 932 struct fsl_asrc *asrc_priv = dev_get_drvdata(dev); 933 int i, ret; 934 935 ret = clk_prepare_enable(asrc_priv->mem_clk); 936 if (ret) 937 return ret; 938 ret = clk_prepare_enable(asrc_priv->ipg_clk); 939 if (ret) 940 goto disable_mem_clk; 941 if (!IS_ERR(asrc_priv->spba_clk)) { 942 ret = clk_prepare_enable(asrc_priv->spba_clk); 943 if (ret) 944 goto disable_ipg_clk; 945 } 946 for (i = 0; i < ASRC_CLK_MAX_NUM; i++) { 947 ret = clk_prepare_enable(asrc_priv->asrck_clk[i]); 948 if (ret) 949 goto disable_asrck_clk; 950 } 951 952 return 0; 953 954 disable_asrck_clk: 955 for (i--; i >= 0; i--) 956 clk_disable_unprepare(asrc_priv->asrck_clk[i]); 957 if (!IS_ERR(asrc_priv->spba_clk)) 958 clk_disable_unprepare(asrc_priv->spba_clk); 959 disable_ipg_clk: 960 clk_disable_unprepare(asrc_priv->ipg_clk); 961 disable_mem_clk: 962 clk_disable_unprepare(asrc_priv->mem_clk); 963 return ret; 964 } 965 966 static int fsl_asrc_runtime_suspend(struct device *dev) 967 { 968 struct fsl_asrc *asrc_priv = dev_get_drvdata(dev); 969 int i; 970 971 for (i = 0; i < ASRC_CLK_MAX_NUM; i++) 972 clk_disable_unprepare(asrc_priv->asrck_clk[i]); 973 if (!IS_ERR(asrc_priv->spba_clk)) 974 clk_disable_unprepare(asrc_priv->spba_clk); 975 clk_disable_unprepare(asrc_priv->ipg_clk); 976 clk_disable_unprepare(asrc_priv->mem_clk); 977 978 return 0; 979 } 980 #endif /* CONFIG_PM */ 981 982 #ifdef CONFIG_PM_SLEEP 983 static int fsl_asrc_suspend(struct device *dev) 984 { 985 struct fsl_asrc *asrc_priv = dev_get_drvdata(dev); 986 987 regmap_read(asrc_priv->regmap, REG_ASRCFG, 988 &asrc_priv->regcache_cfg); 989 990 regcache_cache_only(asrc_priv->regmap, true); 991 regcache_mark_dirty(asrc_priv->regmap); 992 993 return 0; 994 } 995 996 static int fsl_asrc_resume(struct device *dev) 997 { 998 struct fsl_asrc *asrc_priv = dev_get_drvdata(dev); 999 u32 asrctr; 1000 1001 /* Stop all pairs provisionally */ 1002 regmap_read(asrc_priv->regmap, REG_ASRCTR, &asrctr); 1003 regmap_update_bits(asrc_priv->regmap, REG_ASRCTR, 1004 ASRCTR_ASRCEi_ALL_MASK, 0); 1005 1006 /* Restore all registers */ 1007 regcache_cache_only(asrc_priv->regmap, false); 1008 regcache_sync(asrc_priv->regmap); 1009 1010 regmap_update_bits(asrc_priv->regmap, REG_ASRCFG, 1011 ASRCFG_NDPRi_ALL_MASK | ASRCFG_POSTMODi_ALL_MASK | 1012 ASRCFG_PREMODi_ALL_MASK, asrc_priv->regcache_cfg); 1013 1014 /* Restart enabled pairs */ 1015 regmap_update_bits(asrc_priv->regmap, REG_ASRCTR, 1016 ASRCTR_ASRCEi_ALL_MASK, asrctr); 1017 1018 return 0; 1019 } 1020 #endif /* CONFIG_PM_SLEEP */ 1021 1022 static const struct dev_pm_ops fsl_asrc_pm = { 1023 SET_RUNTIME_PM_OPS(fsl_asrc_runtime_suspend, fsl_asrc_runtime_resume, NULL) 1024 SET_SYSTEM_SLEEP_PM_OPS(fsl_asrc_suspend, fsl_asrc_resume) 1025 }; 1026 1027 static const struct of_device_id fsl_asrc_ids[] = { 1028 { .compatible = "fsl,imx35-asrc", }, 1029 { .compatible = "fsl,imx53-asrc", }, 1030 {} 1031 }; 1032 MODULE_DEVICE_TABLE(of, fsl_asrc_ids); 1033 1034 static struct platform_driver fsl_asrc_driver = { 1035 .probe = fsl_asrc_probe, 1036 .driver = { 1037 .name = "fsl-asrc", 1038 .of_match_table = fsl_asrc_ids, 1039 .pm = &fsl_asrc_pm, 1040 }, 1041 }; 1042 module_platform_driver(fsl_asrc_driver); 1043 1044 MODULE_DESCRIPTION("Freescale ASRC ASoC driver"); 1045 MODULE_AUTHOR("Nicolin Chen <nicoleotsuka@gmail.com>"); 1046 MODULE_ALIAS("platform:fsl-asrc"); 1047 MODULE_LICENSE("GPL v2"); 1048