1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * omap-dmic.c -- OMAP ASoC DMIC DAI driver 4 * 5 * Copyright (C) 2010 - 2011 Texas Instruments 6 * 7 * Author: David Lambert <dlambert@ti.com> 8 * Misael Lopez Cruz <misael.lopez@ti.com> 9 * Liam Girdwood <lrg@ti.com> 10 * Peter Ujfalusi <peter.ujfalusi@ti.com> 11 */ 12 13 #include <linux/init.h> 14 #include <linux/module.h> 15 #include <linux/platform_device.h> 16 #include <linux/err.h> 17 #include <linux/clk.h> 18 #include <linux/io.h> 19 #include <linux/slab.h> 20 #include <linux/pm_runtime.h> 21 #include <linux/of_device.h> 22 23 #include <sound/core.h> 24 #include <sound/pcm.h> 25 #include <sound/pcm_params.h> 26 #include <sound/initval.h> 27 #include <sound/soc.h> 28 #include <sound/dmaengine_pcm.h> 29 30 #include "omap-dmic.h" 31 #include "sdma-pcm.h" 32 33 struct omap_dmic { 34 struct device *dev; 35 void __iomem *io_base; 36 struct clk *fclk; 37 struct pm_qos_request pm_qos_req; 38 int latency; 39 int fclk_freq; 40 int out_freq; 41 int clk_div; 42 int sysclk; 43 int threshold; 44 u32 ch_enabled; 45 bool active; 46 struct mutex mutex; 47 48 struct snd_dmaengine_dai_dma_data dma_data; 49 }; 50 51 static inline void omap_dmic_write(struct omap_dmic *dmic, u16 reg, u32 val) 52 { 53 writel_relaxed(val, dmic->io_base + reg); 54 } 55 56 static inline int omap_dmic_read(struct omap_dmic *dmic, u16 reg) 57 { 58 return readl_relaxed(dmic->io_base + reg); 59 } 60 61 static inline void omap_dmic_start(struct omap_dmic *dmic) 62 { 63 u32 ctrl = omap_dmic_read(dmic, OMAP_DMIC_CTRL_REG); 64 65 /* Configure DMA controller */ 66 omap_dmic_write(dmic, OMAP_DMIC_DMAENABLE_SET_REG, 67 OMAP_DMIC_DMA_ENABLE); 68 69 omap_dmic_write(dmic, OMAP_DMIC_CTRL_REG, ctrl | dmic->ch_enabled); 70 } 71 72 static inline void omap_dmic_stop(struct omap_dmic *dmic) 73 { 74 u32 ctrl = omap_dmic_read(dmic, OMAP_DMIC_CTRL_REG); 75 omap_dmic_write(dmic, OMAP_DMIC_CTRL_REG, 76 ctrl & ~OMAP_DMIC_UP_ENABLE_MASK); 77 78 /* Disable DMA request generation */ 79 omap_dmic_write(dmic, OMAP_DMIC_DMAENABLE_CLR_REG, 80 OMAP_DMIC_DMA_ENABLE); 81 82 } 83 84 static inline int dmic_is_enabled(struct omap_dmic *dmic) 85 { 86 return omap_dmic_read(dmic, OMAP_DMIC_CTRL_REG) & 87 OMAP_DMIC_UP_ENABLE_MASK; 88 } 89 90 static int omap_dmic_dai_startup(struct snd_pcm_substream *substream, 91 struct snd_soc_dai *dai) 92 { 93 struct omap_dmic *dmic = snd_soc_dai_get_drvdata(dai); 94 int ret = 0; 95 96 mutex_lock(&dmic->mutex); 97 98 if (!snd_soc_dai_active(dai)) 99 dmic->active = 1; 100 else 101 ret = -EBUSY; 102 103 mutex_unlock(&dmic->mutex); 104 105 return ret; 106 } 107 108 static void omap_dmic_dai_shutdown(struct snd_pcm_substream *substream, 109 struct snd_soc_dai *dai) 110 { 111 struct omap_dmic *dmic = snd_soc_dai_get_drvdata(dai); 112 113 mutex_lock(&dmic->mutex); 114 115 cpu_latency_qos_remove_request(&dmic->pm_qos_req); 116 117 if (!snd_soc_dai_active(dai)) 118 dmic->active = 0; 119 120 mutex_unlock(&dmic->mutex); 121 } 122 123 static int omap_dmic_select_divider(struct omap_dmic *dmic, int sample_rate) 124 { 125 int divider = -EINVAL; 126 127 /* 128 * 192KHz rate is only supported with 19.2MHz/3.84MHz clock 129 * configuration. 130 */ 131 if (sample_rate == 192000) { 132 if (dmic->fclk_freq == 19200000 && dmic->out_freq == 3840000) 133 divider = 0x6; /* Divider: 5 (192KHz sampling rate) */ 134 else 135 dev_err(dmic->dev, 136 "invalid clock configuration for 192KHz\n"); 137 138 return divider; 139 } 140 141 switch (dmic->out_freq) { 142 case 1536000: 143 if (dmic->fclk_freq != 24576000) 144 goto div_err; 145 divider = 0x4; /* Divider: 16 */ 146 break; 147 case 2400000: 148 switch (dmic->fclk_freq) { 149 case 12000000: 150 divider = 0x5; /* Divider: 5 */ 151 break; 152 case 19200000: 153 divider = 0x0; /* Divider: 8 */ 154 break; 155 case 24000000: 156 divider = 0x2; /* Divider: 10 */ 157 break; 158 default: 159 goto div_err; 160 } 161 break; 162 case 3072000: 163 if (dmic->fclk_freq != 24576000) 164 goto div_err; 165 divider = 0x3; /* Divider: 8 */ 166 break; 167 case 3840000: 168 if (dmic->fclk_freq != 19200000) 169 goto div_err; 170 divider = 0x1; /* Divider: 5 (96KHz sampling rate) */ 171 break; 172 default: 173 dev_err(dmic->dev, "invalid out frequency: %dHz\n", 174 dmic->out_freq); 175 break; 176 } 177 178 return divider; 179 180 div_err: 181 dev_err(dmic->dev, "invalid out frequency %dHz for %dHz input\n", 182 dmic->out_freq, dmic->fclk_freq); 183 return -EINVAL; 184 } 185 186 static int omap_dmic_dai_hw_params(struct snd_pcm_substream *substream, 187 struct snd_pcm_hw_params *params, 188 struct snd_soc_dai *dai) 189 { 190 struct omap_dmic *dmic = snd_soc_dai_get_drvdata(dai); 191 struct snd_dmaengine_dai_dma_data *dma_data; 192 int channels; 193 194 dmic->clk_div = omap_dmic_select_divider(dmic, params_rate(params)); 195 if (dmic->clk_div < 0) { 196 dev_err(dmic->dev, "no valid divider for %dHz from %dHz\n", 197 dmic->out_freq, dmic->fclk_freq); 198 return -EINVAL; 199 } 200 201 dmic->ch_enabled = 0; 202 channels = params_channels(params); 203 switch (channels) { 204 case 6: 205 dmic->ch_enabled |= OMAP_DMIC_UP3_ENABLE; 206 fallthrough; 207 case 4: 208 dmic->ch_enabled |= OMAP_DMIC_UP2_ENABLE; 209 fallthrough; 210 case 2: 211 dmic->ch_enabled |= OMAP_DMIC_UP1_ENABLE; 212 break; 213 default: 214 dev_err(dmic->dev, "invalid number of legacy channels\n"); 215 return -EINVAL; 216 } 217 218 /* packet size is threshold * channels */ 219 dma_data = snd_soc_dai_get_dma_data(dai, substream); 220 dma_data->maxburst = dmic->threshold * channels; 221 dmic->latency = (OMAP_DMIC_THRES_MAX - dmic->threshold) * USEC_PER_SEC / 222 params_rate(params); 223 224 return 0; 225 } 226 227 static int omap_dmic_dai_prepare(struct snd_pcm_substream *substream, 228 struct snd_soc_dai *dai) 229 { 230 struct omap_dmic *dmic = snd_soc_dai_get_drvdata(dai); 231 u32 ctrl; 232 233 if (cpu_latency_qos_request_active(&dmic->pm_qos_req)) 234 cpu_latency_qos_update_request(&dmic->pm_qos_req, 235 dmic->latency); 236 237 /* Configure uplink threshold */ 238 omap_dmic_write(dmic, OMAP_DMIC_FIFO_CTRL_REG, dmic->threshold); 239 240 ctrl = omap_dmic_read(dmic, OMAP_DMIC_CTRL_REG); 241 242 /* Set dmic out format */ 243 ctrl &= ~(OMAP_DMIC_FORMAT | OMAP_DMIC_POLAR_MASK); 244 ctrl |= (OMAP_DMICOUTFORMAT_LJUST | OMAP_DMIC_POLAR1 | 245 OMAP_DMIC_POLAR2 | OMAP_DMIC_POLAR3); 246 247 /* Configure dmic clock divider */ 248 ctrl &= ~OMAP_DMIC_CLK_DIV_MASK; 249 ctrl |= OMAP_DMIC_CLK_DIV(dmic->clk_div); 250 251 omap_dmic_write(dmic, OMAP_DMIC_CTRL_REG, ctrl); 252 253 omap_dmic_write(dmic, OMAP_DMIC_CTRL_REG, 254 ctrl | OMAP_DMICOUTFORMAT_LJUST | OMAP_DMIC_POLAR1 | 255 OMAP_DMIC_POLAR2 | OMAP_DMIC_POLAR3); 256 257 return 0; 258 } 259 260 static int omap_dmic_dai_trigger(struct snd_pcm_substream *substream, 261 int cmd, struct snd_soc_dai *dai) 262 { 263 struct omap_dmic *dmic = snd_soc_dai_get_drvdata(dai); 264 265 switch (cmd) { 266 case SNDRV_PCM_TRIGGER_START: 267 omap_dmic_start(dmic); 268 break; 269 case SNDRV_PCM_TRIGGER_STOP: 270 omap_dmic_stop(dmic); 271 break; 272 default: 273 break; 274 } 275 276 return 0; 277 } 278 279 static int omap_dmic_select_fclk(struct omap_dmic *dmic, int clk_id, 280 unsigned int freq) 281 { 282 struct clk *parent_clk, *mux; 283 char *parent_clk_name; 284 int ret = 0; 285 286 switch (freq) { 287 case 12000000: 288 case 19200000: 289 case 24000000: 290 case 24576000: 291 break; 292 default: 293 dev_err(dmic->dev, "invalid input frequency: %dHz\n", freq); 294 dmic->fclk_freq = 0; 295 return -EINVAL; 296 } 297 298 if (dmic->sysclk == clk_id) { 299 dmic->fclk_freq = freq; 300 return 0; 301 } 302 303 /* re-parent not allowed if a stream is ongoing */ 304 if (dmic->active && dmic_is_enabled(dmic)) { 305 dev_err(dmic->dev, "can't re-parent when DMIC active\n"); 306 return -EBUSY; 307 } 308 309 switch (clk_id) { 310 case OMAP_DMIC_SYSCLK_PAD_CLKS: 311 parent_clk_name = "pad_clks_ck"; 312 break; 313 case OMAP_DMIC_SYSCLK_SLIMBLUS_CLKS: 314 parent_clk_name = "slimbus_clk"; 315 break; 316 case OMAP_DMIC_SYSCLK_SYNC_MUX_CLKS: 317 parent_clk_name = "dmic_sync_mux_ck"; 318 break; 319 default: 320 dev_err(dmic->dev, "fclk clk_id (%d) not supported\n", clk_id); 321 return -EINVAL; 322 } 323 324 parent_clk = clk_get(dmic->dev, parent_clk_name); 325 if (IS_ERR(parent_clk)) { 326 dev_err(dmic->dev, "can't get %s\n", parent_clk_name); 327 return -ENODEV; 328 } 329 330 mux = clk_get_parent(dmic->fclk); 331 if (IS_ERR(mux)) { 332 dev_err(dmic->dev, "can't get fck mux parent\n"); 333 clk_put(parent_clk); 334 return -ENODEV; 335 } 336 337 mutex_lock(&dmic->mutex); 338 if (dmic->active) { 339 /* disable clock while reparenting */ 340 pm_runtime_put_sync(dmic->dev); 341 ret = clk_set_parent(mux, parent_clk); 342 pm_runtime_get_sync(dmic->dev); 343 } else { 344 ret = clk_set_parent(mux, parent_clk); 345 } 346 mutex_unlock(&dmic->mutex); 347 348 if (ret < 0) { 349 dev_err(dmic->dev, "re-parent failed\n"); 350 goto err_busy; 351 } 352 353 dmic->sysclk = clk_id; 354 dmic->fclk_freq = freq; 355 356 err_busy: 357 clk_put(mux); 358 clk_put(parent_clk); 359 360 return ret; 361 } 362 363 static int omap_dmic_select_outclk(struct omap_dmic *dmic, int clk_id, 364 unsigned int freq) 365 { 366 int ret = 0; 367 368 if (clk_id != OMAP_DMIC_ABE_DMIC_CLK) { 369 dev_err(dmic->dev, "output clk_id (%d) not supported\n", 370 clk_id); 371 return -EINVAL; 372 } 373 374 switch (freq) { 375 case 1536000: 376 case 2400000: 377 case 3072000: 378 case 3840000: 379 dmic->out_freq = freq; 380 break; 381 default: 382 dev_err(dmic->dev, "invalid out frequency: %dHz\n", freq); 383 dmic->out_freq = 0; 384 ret = -EINVAL; 385 } 386 387 return ret; 388 } 389 390 static int omap_dmic_set_dai_sysclk(struct snd_soc_dai *dai, int clk_id, 391 unsigned int freq, int dir) 392 { 393 struct omap_dmic *dmic = snd_soc_dai_get_drvdata(dai); 394 395 if (dir == SND_SOC_CLOCK_IN) 396 return omap_dmic_select_fclk(dmic, clk_id, freq); 397 else if (dir == SND_SOC_CLOCK_OUT) 398 return omap_dmic_select_outclk(dmic, clk_id, freq); 399 400 dev_err(dmic->dev, "invalid clock direction (%d)\n", dir); 401 return -EINVAL; 402 } 403 404 static const struct snd_soc_dai_ops omap_dmic_dai_ops = { 405 .startup = omap_dmic_dai_startup, 406 .shutdown = omap_dmic_dai_shutdown, 407 .hw_params = omap_dmic_dai_hw_params, 408 .prepare = omap_dmic_dai_prepare, 409 .trigger = omap_dmic_dai_trigger, 410 .set_sysclk = omap_dmic_set_dai_sysclk, 411 }; 412 413 static int omap_dmic_probe(struct snd_soc_dai *dai) 414 { 415 struct omap_dmic *dmic = snd_soc_dai_get_drvdata(dai); 416 417 pm_runtime_enable(dmic->dev); 418 419 /* Disable lines while request is ongoing */ 420 pm_runtime_get_sync(dmic->dev); 421 omap_dmic_write(dmic, OMAP_DMIC_CTRL_REG, 0x00); 422 pm_runtime_put_sync(dmic->dev); 423 424 /* Configure DMIC threshold value */ 425 dmic->threshold = OMAP_DMIC_THRES_MAX - 3; 426 427 snd_soc_dai_init_dma_data(dai, NULL, &dmic->dma_data); 428 429 return 0; 430 } 431 432 static int omap_dmic_remove(struct snd_soc_dai *dai) 433 { 434 struct omap_dmic *dmic = snd_soc_dai_get_drvdata(dai); 435 436 pm_runtime_disable(dmic->dev); 437 438 return 0; 439 } 440 441 static struct snd_soc_dai_driver omap_dmic_dai = { 442 .name = "omap-dmic", 443 .probe = omap_dmic_probe, 444 .remove = omap_dmic_remove, 445 .capture = { 446 .channels_min = 2, 447 .channels_max = 6, 448 .rates = SNDRV_PCM_RATE_96000 | SNDRV_PCM_RATE_192000, 449 .formats = SNDRV_PCM_FMTBIT_S32_LE, 450 .sig_bits = 24, 451 }, 452 .ops = &omap_dmic_dai_ops, 453 }; 454 455 static const struct snd_soc_component_driver omap_dmic_component = { 456 .name = "omap-dmic", 457 }; 458 459 static int asoc_dmic_probe(struct platform_device *pdev) 460 { 461 struct omap_dmic *dmic; 462 struct resource *res; 463 int ret; 464 465 dmic = devm_kzalloc(&pdev->dev, sizeof(struct omap_dmic), GFP_KERNEL); 466 if (!dmic) 467 return -ENOMEM; 468 469 platform_set_drvdata(pdev, dmic); 470 dmic->dev = &pdev->dev; 471 dmic->sysclk = OMAP_DMIC_SYSCLK_SYNC_MUX_CLKS; 472 473 mutex_init(&dmic->mutex); 474 475 dmic->fclk = devm_clk_get(dmic->dev, "fck"); 476 if (IS_ERR(dmic->fclk)) { 477 dev_err(dmic->dev, "cant get fck\n"); 478 return -ENODEV; 479 } 480 481 res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "dma"); 482 if (!res) { 483 dev_err(dmic->dev, "invalid dma memory resource\n"); 484 return -ENODEV; 485 } 486 dmic->dma_data.addr = res->start + OMAP_DMIC_DATA_REG; 487 488 dmic->dma_data.filter_data = "up_link"; 489 490 res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "mpu"); 491 dmic->io_base = devm_ioremap_resource(&pdev->dev, res); 492 if (IS_ERR(dmic->io_base)) 493 return PTR_ERR(dmic->io_base); 494 495 496 ret = devm_snd_soc_register_component(&pdev->dev, 497 &omap_dmic_component, 498 &omap_dmic_dai, 1); 499 if (ret) 500 return ret; 501 502 ret = sdma_pcm_platform_register(&pdev->dev, NULL, "up_link"); 503 if (ret) 504 return ret; 505 506 return 0; 507 } 508 509 static const struct of_device_id omap_dmic_of_match[] = { 510 { .compatible = "ti,omap4-dmic", }, 511 { } 512 }; 513 MODULE_DEVICE_TABLE(of, omap_dmic_of_match); 514 515 static struct platform_driver asoc_dmic_driver = { 516 .driver = { 517 .name = "omap-dmic", 518 .of_match_table = omap_dmic_of_match, 519 }, 520 .probe = asoc_dmic_probe, 521 }; 522 523 module_platform_driver(asoc_dmic_driver); 524 525 MODULE_ALIAS("platform:omap-dmic"); 526 MODULE_AUTHOR("Peter Ujfalusi <peter.ujfalusi@ti.com>"); 527 MODULE_DESCRIPTION("OMAP DMIC ASoC Interface"); 528 MODULE_LICENSE("GPL"); 529