1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * STM32 ALSA SoC Digital Audio Interface (SPDIF-rx) driver. 4 * 5 * Copyright (C) 2017, STMicroelectronics - All Rights Reserved 6 * Author(s): Olivier Moysan <olivier.moysan@st.com> for STMicroelectronics. 7 */ 8 9 #include <linux/bitfield.h> 10 #include <linux/clk.h> 11 #include <linux/completion.h> 12 #include <linux/delay.h> 13 #include <linux/module.h> 14 #include <linux/of_platform.h> 15 #include <linux/pm_runtime.h> 16 #include <linux/regmap.h> 17 #include <linux/reset.h> 18 19 #include <sound/dmaengine_pcm.h> 20 #include <sound/pcm_params.h> 21 22 /* SPDIF-rx Register Map */ 23 #define STM32_SPDIFRX_CR 0x00 24 #define STM32_SPDIFRX_IMR 0x04 25 #define STM32_SPDIFRX_SR 0x08 26 #define STM32_SPDIFRX_IFCR 0x0C 27 #define STM32_SPDIFRX_DR 0x10 28 #define STM32_SPDIFRX_CSR 0x14 29 #define STM32_SPDIFRX_DIR 0x18 30 #define STM32_SPDIFRX_VERR 0x3F4 31 #define STM32_SPDIFRX_IDR 0x3F8 32 #define STM32_SPDIFRX_SIDR 0x3FC 33 34 /* Bit definition for SPDIF_CR register */ 35 #define SPDIFRX_CR_SPDIFEN_SHIFT 0 36 #define SPDIFRX_CR_SPDIFEN_MASK GENMASK(1, SPDIFRX_CR_SPDIFEN_SHIFT) 37 #define SPDIFRX_CR_SPDIFENSET(x) ((x) << SPDIFRX_CR_SPDIFEN_SHIFT) 38 39 #define SPDIFRX_CR_RXDMAEN BIT(2) 40 #define SPDIFRX_CR_RXSTEO BIT(3) 41 42 #define SPDIFRX_CR_DRFMT_SHIFT 4 43 #define SPDIFRX_CR_DRFMT_MASK GENMASK(5, SPDIFRX_CR_DRFMT_SHIFT) 44 #define SPDIFRX_CR_DRFMTSET(x) ((x) << SPDIFRX_CR_DRFMT_SHIFT) 45 46 #define SPDIFRX_CR_PMSK BIT(6) 47 #define SPDIFRX_CR_VMSK BIT(7) 48 #define SPDIFRX_CR_CUMSK BIT(8) 49 #define SPDIFRX_CR_PTMSK BIT(9) 50 #define SPDIFRX_CR_CBDMAEN BIT(10) 51 #define SPDIFRX_CR_CHSEL_SHIFT 11 52 #define SPDIFRX_CR_CHSEL BIT(SPDIFRX_CR_CHSEL_SHIFT) 53 54 #define SPDIFRX_CR_NBTR_SHIFT 12 55 #define SPDIFRX_CR_NBTR_MASK GENMASK(13, SPDIFRX_CR_NBTR_SHIFT) 56 #define SPDIFRX_CR_NBTRSET(x) ((x) << SPDIFRX_CR_NBTR_SHIFT) 57 58 #define SPDIFRX_CR_WFA BIT(14) 59 60 #define SPDIFRX_CR_INSEL_SHIFT 16 61 #define SPDIFRX_CR_INSEL_MASK GENMASK(18, PDIFRX_CR_INSEL_SHIFT) 62 #define SPDIFRX_CR_INSELSET(x) ((x) << SPDIFRX_CR_INSEL_SHIFT) 63 64 #define SPDIFRX_CR_CKSEN_SHIFT 20 65 #define SPDIFRX_CR_CKSEN BIT(20) 66 #define SPDIFRX_CR_CKSBKPEN BIT(21) 67 68 /* Bit definition for SPDIFRX_IMR register */ 69 #define SPDIFRX_IMR_RXNEI BIT(0) 70 #define SPDIFRX_IMR_CSRNEIE BIT(1) 71 #define SPDIFRX_IMR_PERRIE BIT(2) 72 #define SPDIFRX_IMR_OVRIE BIT(3) 73 #define SPDIFRX_IMR_SBLKIE BIT(4) 74 #define SPDIFRX_IMR_SYNCDIE BIT(5) 75 #define SPDIFRX_IMR_IFEIE BIT(6) 76 77 #define SPDIFRX_XIMR_MASK GENMASK(6, 0) 78 79 /* Bit definition for SPDIFRX_SR register */ 80 #define SPDIFRX_SR_RXNE BIT(0) 81 #define SPDIFRX_SR_CSRNE BIT(1) 82 #define SPDIFRX_SR_PERR BIT(2) 83 #define SPDIFRX_SR_OVR BIT(3) 84 #define SPDIFRX_SR_SBD BIT(4) 85 #define SPDIFRX_SR_SYNCD BIT(5) 86 #define SPDIFRX_SR_FERR BIT(6) 87 #define SPDIFRX_SR_SERR BIT(7) 88 #define SPDIFRX_SR_TERR BIT(8) 89 90 #define SPDIFRX_SR_WIDTH5_SHIFT 16 91 #define SPDIFRX_SR_WIDTH5_MASK GENMASK(30, PDIFRX_SR_WIDTH5_SHIFT) 92 #define SPDIFRX_SR_WIDTH5SET(x) ((x) << SPDIFRX_SR_WIDTH5_SHIFT) 93 94 /* Bit definition for SPDIFRX_IFCR register */ 95 #define SPDIFRX_IFCR_PERRCF BIT(2) 96 #define SPDIFRX_IFCR_OVRCF BIT(3) 97 #define SPDIFRX_IFCR_SBDCF BIT(4) 98 #define SPDIFRX_IFCR_SYNCDCF BIT(5) 99 100 #define SPDIFRX_XIFCR_MASK GENMASK(5, 2) 101 102 /* Bit definition for SPDIFRX_DR register (DRFMT = 0b00) */ 103 #define SPDIFRX_DR0_DR_SHIFT 0 104 #define SPDIFRX_DR0_DR_MASK GENMASK(23, SPDIFRX_DR0_DR_SHIFT) 105 #define SPDIFRX_DR0_DRSET(x) ((x) << SPDIFRX_DR0_DR_SHIFT) 106 107 #define SPDIFRX_DR0_PE BIT(24) 108 109 #define SPDIFRX_DR0_V BIT(25) 110 #define SPDIFRX_DR0_U BIT(26) 111 #define SPDIFRX_DR0_C BIT(27) 112 113 #define SPDIFRX_DR0_PT_SHIFT 28 114 #define SPDIFRX_DR0_PT_MASK GENMASK(29, SPDIFRX_DR0_PT_SHIFT) 115 #define SPDIFRX_DR0_PTSET(x) ((x) << SPDIFRX_DR0_PT_SHIFT) 116 117 /* Bit definition for SPDIFRX_DR register (DRFMT = 0b01) */ 118 #define SPDIFRX_DR1_PE BIT(0) 119 #define SPDIFRX_DR1_V BIT(1) 120 #define SPDIFRX_DR1_U BIT(2) 121 #define SPDIFRX_DR1_C BIT(3) 122 123 #define SPDIFRX_DR1_PT_SHIFT 4 124 #define SPDIFRX_DR1_PT_MASK GENMASK(5, SPDIFRX_DR1_PT_SHIFT) 125 #define SPDIFRX_DR1_PTSET(x) ((x) << SPDIFRX_DR1_PT_SHIFT) 126 127 #define SPDIFRX_DR1_DR_SHIFT 8 128 #define SPDIFRX_DR1_DR_MASK GENMASK(31, SPDIFRX_DR1_DR_SHIFT) 129 #define SPDIFRX_DR1_DRSET(x) ((x) << SPDIFRX_DR1_DR_SHIFT) 130 131 /* Bit definition for SPDIFRX_DR register (DRFMT = 0b10) */ 132 #define SPDIFRX_DR1_DRNL1_SHIFT 0 133 #define SPDIFRX_DR1_DRNL1_MASK GENMASK(15, SPDIFRX_DR1_DRNL1_SHIFT) 134 #define SPDIFRX_DR1_DRNL1SET(x) ((x) << SPDIFRX_DR1_DRNL1_SHIFT) 135 136 #define SPDIFRX_DR1_DRNL2_SHIFT 16 137 #define SPDIFRX_DR1_DRNL2_MASK GENMASK(31, SPDIFRX_DR1_DRNL2_SHIFT) 138 #define SPDIFRX_DR1_DRNL2SET(x) ((x) << SPDIFRX_DR1_DRNL2_SHIFT) 139 140 /* Bit definition for SPDIFRX_CSR register */ 141 #define SPDIFRX_CSR_USR_SHIFT 0 142 #define SPDIFRX_CSR_USR_MASK GENMASK(15, SPDIFRX_CSR_USR_SHIFT) 143 #define SPDIFRX_CSR_USRGET(x) (((x) & SPDIFRX_CSR_USR_MASK)\ 144 >> SPDIFRX_CSR_USR_SHIFT) 145 146 #define SPDIFRX_CSR_CS_SHIFT 16 147 #define SPDIFRX_CSR_CS_MASK GENMASK(23, SPDIFRX_CSR_CS_SHIFT) 148 #define SPDIFRX_CSR_CSGET(x) (((x) & SPDIFRX_CSR_CS_MASK)\ 149 >> SPDIFRX_CSR_CS_SHIFT) 150 151 #define SPDIFRX_CSR_SOB BIT(24) 152 153 /* Bit definition for SPDIFRX_DIR register */ 154 #define SPDIFRX_DIR_THI_SHIFT 0 155 #define SPDIFRX_DIR_THI_MASK GENMASK(12, SPDIFRX_DIR_THI_SHIFT) 156 #define SPDIFRX_DIR_THI_SET(x) ((x) << SPDIFRX_DIR_THI_SHIFT) 157 158 #define SPDIFRX_DIR_TLO_SHIFT 16 159 #define SPDIFRX_DIR_TLO_MASK GENMASK(28, SPDIFRX_DIR_TLO_SHIFT) 160 #define SPDIFRX_DIR_TLO_SET(x) ((x) << SPDIFRX_DIR_TLO_SHIFT) 161 162 #define SPDIFRX_SPDIFEN_DISABLE 0x0 163 #define SPDIFRX_SPDIFEN_SYNC 0x1 164 #define SPDIFRX_SPDIFEN_ENABLE 0x3 165 166 /* Bit definition for SPDIFRX_VERR register */ 167 #define SPDIFRX_VERR_MIN_MASK GENMASK(3, 0) 168 #define SPDIFRX_VERR_MAJ_MASK GENMASK(7, 4) 169 170 /* Bit definition for SPDIFRX_IDR register */ 171 #define SPDIFRX_IDR_ID_MASK GENMASK(31, 0) 172 173 /* Bit definition for SPDIFRX_SIDR register */ 174 #define SPDIFRX_SIDR_SID_MASK GENMASK(31, 0) 175 176 #define SPDIFRX_IPIDR_NUMBER 0x00130041 177 178 #define SPDIFRX_IN1 0x1 179 #define SPDIFRX_IN2 0x2 180 #define SPDIFRX_IN3 0x3 181 #define SPDIFRX_IN4 0x4 182 #define SPDIFRX_IN5 0x5 183 #define SPDIFRX_IN6 0x6 184 #define SPDIFRX_IN7 0x7 185 #define SPDIFRX_IN8 0x8 186 187 #define SPDIFRX_NBTR_NONE 0x0 188 #define SPDIFRX_NBTR_3 0x1 189 #define SPDIFRX_NBTR_15 0x2 190 #define SPDIFRX_NBTR_63 0x3 191 192 #define SPDIFRX_DRFMT_RIGHT 0x0 193 #define SPDIFRX_DRFMT_LEFT 0x1 194 #define SPDIFRX_DRFMT_PACKED 0x2 195 196 /* 192 CS bits in S/PDIF frame. i.e 24 CS bytes */ 197 #define SPDIFRX_CS_BYTES_NB 24 198 #define SPDIFRX_UB_BYTES_NB 48 199 200 /* 201 * CSR register is retrieved as a 32 bits word 202 * It contains 1 channel status byte and 2 user data bytes 203 * 2 S/PDIF frames are acquired to get all CS/UB bits 204 */ 205 #define SPDIFRX_CSR_BUF_LENGTH (SPDIFRX_CS_BYTES_NB * 4 * 2) 206 207 /** 208 * struct stm32_spdifrx_data - private data of SPDIFRX 209 * @pdev: device data pointer 210 * @base: mmio register base virtual address 211 * @regmap: SPDIFRX register map pointer 212 * @regmap_conf: SPDIFRX register map configuration pointer 213 * @cs_completion: channel status retrieving completion 214 * @kclk: kernel clock feeding the SPDIFRX clock generator 215 * @dma_params: dma configuration data for rx channel 216 * @substream: PCM substream data pointer 217 * @dmab: dma buffer info pointer 218 * @ctrl_chan: dma channel for S/PDIF control bits 219 * @desc:dma async transaction descriptor 220 * @slave_config: dma slave channel runtime config pointer 221 * @phys_addr: SPDIFRX registers physical base address 222 * @lock: synchronization enabling lock 223 * @irq_lock: prevent race condition with IRQ on stream state 224 * @cs: channel status buffer 225 * @ub: user data buffer 226 * @irq: SPDIFRX interrupt line 227 * @refcount: keep count of opened DMA channels 228 */ 229 struct stm32_spdifrx_data { 230 struct platform_device *pdev; 231 void __iomem *base; 232 struct regmap *regmap; 233 const struct regmap_config *regmap_conf; 234 struct completion cs_completion; 235 struct clk *kclk; 236 struct snd_dmaengine_dai_dma_data dma_params; 237 struct snd_pcm_substream *substream; 238 struct snd_dma_buffer *dmab; 239 struct dma_chan *ctrl_chan; 240 struct dma_async_tx_descriptor *desc; 241 struct dma_slave_config slave_config; 242 dma_addr_t phys_addr; 243 spinlock_t lock; /* Sync enabling lock */ 244 spinlock_t irq_lock; /* Prevent race condition on stream state */ 245 unsigned char cs[SPDIFRX_CS_BYTES_NB]; 246 unsigned char ub[SPDIFRX_UB_BYTES_NB]; 247 int irq; 248 int refcount; 249 }; 250 251 static void stm32_spdifrx_dma_complete(void *data) 252 { 253 struct stm32_spdifrx_data *spdifrx = (struct stm32_spdifrx_data *)data; 254 struct platform_device *pdev = spdifrx->pdev; 255 u32 *p_start = (u32 *)spdifrx->dmab->area; 256 u32 *p_end = p_start + (2 * SPDIFRX_CS_BYTES_NB) - 1; 257 u32 *ptr = p_start; 258 u16 *ub_ptr = (short *)spdifrx->ub; 259 int i = 0; 260 261 regmap_update_bits(spdifrx->regmap, STM32_SPDIFRX_CR, 262 SPDIFRX_CR_CBDMAEN, 263 (unsigned int)~SPDIFRX_CR_CBDMAEN); 264 265 if (!spdifrx->dmab->area) 266 return; 267 268 while (ptr <= p_end) { 269 if (*ptr & SPDIFRX_CSR_SOB) 270 break; 271 ptr++; 272 } 273 274 if (ptr > p_end) { 275 dev_err(&pdev->dev, "Start of S/PDIF block not found\n"); 276 return; 277 } 278 279 while (i < SPDIFRX_CS_BYTES_NB) { 280 spdifrx->cs[i] = (unsigned char)SPDIFRX_CSR_CSGET(*ptr); 281 *ub_ptr++ = SPDIFRX_CSR_USRGET(*ptr++); 282 if (ptr > p_end) { 283 dev_err(&pdev->dev, "Failed to get channel status\n"); 284 return; 285 } 286 i++; 287 } 288 289 complete(&spdifrx->cs_completion); 290 } 291 292 static int stm32_spdifrx_dma_ctrl_start(struct stm32_spdifrx_data *spdifrx) 293 { 294 dma_cookie_t cookie; 295 int err; 296 297 spdifrx->desc = dmaengine_prep_slave_single(spdifrx->ctrl_chan, 298 spdifrx->dmab->addr, 299 SPDIFRX_CSR_BUF_LENGTH, 300 DMA_DEV_TO_MEM, 301 DMA_CTRL_ACK); 302 if (!spdifrx->desc) 303 return -EINVAL; 304 305 spdifrx->desc->callback = stm32_spdifrx_dma_complete; 306 spdifrx->desc->callback_param = spdifrx; 307 cookie = dmaengine_submit(spdifrx->desc); 308 err = dma_submit_error(cookie); 309 if (err) 310 return -EINVAL; 311 312 dma_async_issue_pending(spdifrx->ctrl_chan); 313 314 return 0; 315 } 316 317 static void stm32_spdifrx_dma_ctrl_stop(struct stm32_spdifrx_data *spdifrx) 318 { 319 dmaengine_terminate_async(spdifrx->ctrl_chan); 320 } 321 322 static int stm32_spdifrx_start_sync(struct stm32_spdifrx_data *spdifrx) 323 { 324 int cr, cr_mask, imr, ret; 325 unsigned long flags; 326 327 /* Enable IRQs */ 328 imr = SPDIFRX_IMR_IFEIE | SPDIFRX_IMR_SYNCDIE | SPDIFRX_IMR_PERRIE; 329 ret = regmap_update_bits(spdifrx->regmap, STM32_SPDIFRX_IMR, imr, imr); 330 if (ret) 331 return ret; 332 333 spin_lock_irqsave(&spdifrx->lock, flags); 334 335 spdifrx->refcount++; 336 337 regmap_read(spdifrx->regmap, STM32_SPDIFRX_CR, &cr); 338 339 if (!(cr & SPDIFRX_CR_SPDIFEN_MASK)) { 340 /* 341 * Start sync if SPDIFRX is still in idle state. 342 * SPDIFRX reception enabled when sync done 343 */ 344 dev_dbg(&spdifrx->pdev->dev, "start synchronization\n"); 345 346 /* 347 * SPDIFRX configuration: 348 * Wait for activity before starting sync process. This avoid 349 * to issue sync errors when spdif signal is missing on input. 350 * Preamble, CS, user, validity and parity error bits not copied 351 * to DR register. 352 */ 353 cr = SPDIFRX_CR_WFA | SPDIFRX_CR_PMSK | SPDIFRX_CR_VMSK | 354 SPDIFRX_CR_CUMSK | SPDIFRX_CR_PTMSK | SPDIFRX_CR_RXSTEO; 355 cr_mask = cr; 356 357 cr |= SPDIFRX_CR_NBTRSET(SPDIFRX_NBTR_63); 358 cr_mask |= SPDIFRX_CR_NBTR_MASK; 359 cr |= SPDIFRX_CR_SPDIFENSET(SPDIFRX_SPDIFEN_SYNC); 360 cr_mask |= SPDIFRX_CR_SPDIFEN_MASK; 361 ret = regmap_update_bits(spdifrx->regmap, STM32_SPDIFRX_CR, 362 cr_mask, cr); 363 if (ret < 0) 364 dev_err(&spdifrx->pdev->dev, 365 "Failed to start synchronization\n"); 366 } 367 368 spin_unlock_irqrestore(&spdifrx->lock, flags); 369 370 return ret; 371 } 372 373 static void stm32_spdifrx_stop(struct stm32_spdifrx_data *spdifrx) 374 { 375 int cr, cr_mask, reg; 376 unsigned long flags; 377 378 spin_lock_irqsave(&spdifrx->lock, flags); 379 380 if (--spdifrx->refcount) { 381 spin_unlock_irqrestore(&spdifrx->lock, flags); 382 return; 383 } 384 385 cr = SPDIFRX_CR_SPDIFENSET(SPDIFRX_SPDIFEN_DISABLE); 386 cr_mask = SPDIFRX_CR_SPDIFEN_MASK | SPDIFRX_CR_RXDMAEN; 387 388 regmap_update_bits(spdifrx->regmap, STM32_SPDIFRX_CR, cr_mask, cr); 389 390 regmap_update_bits(spdifrx->regmap, STM32_SPDIFRX_IMR, 391 SPDIFRX_XIMR_MASK, 0); 392 393 regmap_update_bits(spdifrx->regmap, STM32_SPDIFRX_IFCR, 394 SPDIFRX_XIFCR_MASK, SPDIFRX_XIFCR_MASK); 395 396 /* dummy read to clear CSRNE and RXNE in status register */ 397 regmap_read(spdifrx->regmap, STM32_SPDIFRX_DR, ®); 398 regmap_read(spdifrx->regmap, STM32_SPDIFRX_CSR, ®); 399 400 spin_unlock_irqrestore(&spdifrx->lock, flags); 401 } 402 403 static int stm32_spdifrx_dma_ctrl_register(struct device *dev, 404 struct stm32_spdifrx_data *spdifrx) 405 { 406 int ret; 407 408 spdifrx->ctrl_chan = dma_request_chan(dev, "rx-ctrl"); 409 if (IS_ERR(spdifrx->ctrl_chan)) 410 return dev_err_probe(dev, PTR_ERR(spdifrx->ctrl_chan), 411 "dma_request_slave_channel error\n"); 412 413 spdifrx->dmab = devm_kzalloc(dev, sizeof(struct snd_dma_buffer), 414 GFP_KERNEL); 415 if (!spdifrx->dmab) 416 return -ENOMEM; 417 418 spdifrx->dmab->dev.type = SNDRV_DMA_TYPE_DEV_IRAM; 419 spdifrx->dmab->dev.dev = dev; 420 ret = snd_dma_alloc_pages(spdifrx->dmab->dev.type, dev, 421 SPDIFRX_CSR_BUF_LENGTH, spdifrx->dmab); 422 if (ret < 0) { 423 dev_err(dev, "snd_dma_alloc_pages returned error %d\n", ret); 424 return ret; 425 } 426 427 spdifrx->slave_config.direction = DMA_DEV_TO_MEM; 428 spdifrx->slave_config.src_addr = (dma_addr_t)(spdifrx->phys_addr + 429 STM32_SPDIFRX_CSR); 430 spdifrx->slave_config.dst_addr = spdifrx->dmab->addr; 431 spdifrx->slave_config.src_addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES; 432 spdifrx->slave_config.src_maxburst = 1; 433 434 ret = dmaengine_slave_config(spdifrx->ctrl_chan, 435 &spdifrx->slave_config); 436 if (ret < 0) { 437 dev_err(dev, "dmaengine_slave_config returned error %d\n", ret); 438 spdifrx->ctrl_chan = NULL; 439 } 440 441 return ret; 442 }; 443 444 static const char * const spdifrx_enum_input[] = { 445 "in0", "in1", "in2", "in3" 446 }; 447 448 /* By default CS bits are retrieved from channel A */ 449 static const char * const spdifrx_enum_cs_channel[] = { 450 "A", "B" 451 }; 452 453 static SOC_ENUM_SINGLE_DECL(ctrl_enum_input, 454 STM32_SPDIFRX_CR, SPDIFRX_CR_INSEL_SHIFT, 455 spdifrx_enum_input); 456 457 static SOC_ENUM_SINGLE_DECL(ctrl_enum_cs_channel, 458 STM32_SPDIFRX_CR, SPDIFRX_CR_CHSEL_SHIFT, 459 spdifrx_enum_cs_channel); 460 461 static int stm32_spdifrx_info(struct snd_kcontrol *kcontrol, 462 struct snd_ctl_elem_info *uinfo) 463 { 464 uinfo->type = SNDRV_CTL_ELEM_TYPE_IEC958; 465 uinfo->count = 1; 466 467 return 0; 468 } 469 470 static int stm32_spdifrx_ub_info(struct snd_kcontrol *kcontrol, 471 struct snd_ctl_elem_info *uinfo) 472 { 473 uinfo->type = SNDRV_CTL_ELEM_TYPE_IEC958; 474 uinfo->count = 1; 475 476 return 0; 477 } 478 479 static int stm32_spdifrx_get_ctrl_data(struct stm32_spdifrx_data *spdifrx) 480 { 481 int ret = 0; 482 483 memset(spdifrx->cs, 0, SPDIFRX_CS_BYTES_NB); 484 memset(spdifrx->ub, 0, SPDIFRX_UB_BYTES_NB); 485 486 ret = stm32_spdifrx_dma_ctrl_start(spdifrx); 487 if (ret < 0) 488 return ret; 489 490 ret = clk_prepare_enable(spdifrx->kclk); 491 if (ret) { 492 dev_err(&spdifrx->pdev->dev, "Enable kclk failed: %d\n", ret); 493 return ret; 494 } 495 496 ret = regmap_update_bits(spdifrx->regmap, STM32_SPDIFRX_CR, 497 SPDIFRX_CR_CBDMAEN, SPDIFRX_CR_CBDMAEN); 498 if (ret < 0) 499 goto end; 500 501 ret = stm32_spdifrx_start_sync(spdifrx); 502 if (ret < 0) 503 goto end; 504 505 if (wait_for_completion_interruptible_timeout(&spdifrx->cs_completion, 506 msecs_to_jiffies(100)) 507 <= 0) { 508 dev_dbg(&spdifrx->pdev->dev, "Failed to get control data\n"); 509 ret = -EAGAIN; 510 } 511 512 stm32_spdifrx_stop(spdifrx); 513 stm32_spdifrx_dma_ctrl_stop(spdifrx); 514 515 end: 516 clk_disable_unprepare(spdifrx->kclk); 517 518 return ret; 519 } 520 521 static int stm32_spdifrx_capture_get(struct snd_kcontrol *kcontrol, 522 struct snd_ctl_elem_value *ucontrol) 523 { 524 struct snd_soc_dai *cpu_dai = snd_kcontrol_chip(kcontrol); 525 struct stm32_spdifrx_data *spdifrx = snd_soc_dai_get_drvdata(cpu_dai); 526 527 stm32_spdifrx_get_ctrl_data(spdifrx); 528 529 ucontrol->value.iec958.status[0] = spdifrx->cs[0]; 530 ucontrol->value.iec958.status[1] = spdifrx->cs[1]; 531 ucontrol->value.iec958.status[2] = spdifrx->cs[2]; 532 ucontrol->value.iec958.status[3] = spdifrx->cs[3]; 533 ucontrol->value.iec958.status[4] = spdifrx->cs[4]; 534 535 return 0; 536 } 537 538 static int stm32_spdif_user_bits_get(struct snd_kcontrol *kcontrol, 539 struct snd_ctl_elem_value *ucontrol) 540 { 541 struct snd_soc_dai *cpu_dai = snd_kcontrol_chip(kcontrol); 542 struct stm32_spdifrx_data *spdifrx = snd_soc_dai_get_drvdata(cpu_dai); 543 544 stm32_spdifrx_get_ctrl_data(spdifrx); 545 546 ucontrol->value.iec958.status[0] = spdifrx->ub[0]; 547 ucontrol->value.iec958.status[1] = spdifrx->ub[1]; 548 ucontrol->value.iec958.status[2] = spdifrx->ub[2]; 549 ucontrol->value.iec958.status[3] = spdifrx->ub[3]; 550 ucontrol->value.iec958.status[4] = spdifrx->ub[4]; 551 552 return 0; 553 } 554 555 static struct snd_kcontrol_new stm32_spdifrx_iec_ctrls[] = { 556 /* Channel status control */ 557 { 558 .iface = SNDRV_CTL_ELEM_IFACE_PCM, 559 .name = SNDRV_CTL_NAME_IEC958("", CAPTURE, DEFAULT), 560 .access = SNDRV_CTL_ELEM_ACCESS_READ | 561 SNDRV_CTL_ELEM_ACCESS_VOLATILE, 562 .info = stm32_spdifrx_info, 563 .get = stm32_spdifrx_capture_get, 564 }, 565 /* User bits control */ 566 { 567 .iface = SNDRV_CTL_ELEM_IFACE_PCM, 568 .name = "IEC958 User Bit Capture Default", 569 .access = SNDRV_CTL_ELEM_ACCESS_READ | 570 SNDRV_CTL_ELEM_ACCESS_VOLATILE, 571 .info = stm32_spdifrx_ub_info, 572 .get = stm32_spdif_user_bits_get, 573 }, 574 }; 575 576 static struct snd_kcontrol_new stm32_spdifrx_ctrls[] = { 577 SOC_ENUM("SPDIFRX input", ctrl_enum_input), 578 SOC_ENUM("SPDIFRX CS channel", ctrl_enum_cs_channel), 579 }; 580 581 static int stm32_spdifrx_dai_register_ctrls(struct snd_soc_dai *cpu_dai) 582 { 583 int ret; 584 585 ret = snd_soc_add_dai_controls(cpu_dai, stm32_spdifrx_iec_ctrls, 586 ARRAY_SIZE(stm32_spdifrx_iec_ctrls)); 587 if (ret < 0) 588 return ret; 589 590 return snd_soc_add_component_controls(cpu_dai->component, 591 stm32_spdifrx_ctrls, 592 ARRAY_SIZE(stm32_spdifrx_ctrls)); 593 } 594 595 static int stm32_spdifrx_dai_probe(struct snd_soc_dai *cpu_dai) 596 { 597 struct stm32_spdifrx_data *spdifrx = dev_get_drvdata(cpu_dai->dev); 598 599 spdifrx->dma_params.addr = (dma_addr_t)(spdifrx->phys_addr + 600 STM32_SPDIFRX_DR); 601 spdifrx->dma_params.maxburst = 1; 602 603 snd_soc_dai_init_dma_data(cpu_dai, NULL, &spdifrx->dma_params); 604 605 return stm32_spdifrx_dai_register_ctrls(cpu_dai); 606 } 607 608 static bool stm32_spdifrx_readable_reg(struct device *dev, unsigned int reg) 609 { 610 switch (reg) { 611 case STM32_SPDIFRX_CR: 612 case STM32_SPDIFRX_IMR: 613 case STM32_SPDIFRX_SR: 614 case STM32_SPDIFRX_IFCR: 615 case STM32_SPDIFRX_DR: 616 case STM32_SPDIFRX_CSR: 617 case STM32_SPDIFRX_DIR: 618 case STM32_SPDIFRX_VERR: 619 case STM32_SPDIFRX_IDR: 620 case STM32_SPDIFRX_SIDR: 621 return true; 622 default: 623 return false; 624 } 625 } 626 627 static bool stm32_spdifrx_volatile_reg(struct device *dev, unsigned int reg) 628 { 629 switch (reg) { 630 case STM32_SPDIFRX_DR: 631 case STM32_SPDIFRX_CSR: 632 case STM32_SPDIFRX_SR: 633 case STM32_SPDIFRX_DIR: 634 return true; 635 default: 636 return false; 637 } 638 } 639 640 static bool stm32_spdifrx_writeable_reg(struct device *dev, unsigned int reg) 641 { 642 switch (reg) { 643 case STM32_SPDIFRX_CR: 644 case STM32_SPDIFRX_IMR: 645 case STM32_SPDIFRX_IFCR: 646 return true; 647 default: 648 return false; 649 } 650 } 651 652 static const struct regmap_config stm32_h7_spdifrx_regmap_conf = { 653 .reg_bits = 32, 654 .reg_stride = 4, 655 .val_bits = 32, 656 .max_register = STM32_SPDIFRX_SIDR, 657 .readable_reg = stm32_spdifrx_readable_reg, 658 .volatile_reg = stm32_spdifrx_volatile_reg, 659 .writeable_reg = stm32_spdifrx_writeable_reg, 660 .num_reg_defaults_raw = STM32_SPDIFRX_SIDR / sizeof(u32) + 1, 661 .fast_io = true, 662 .cache_type = REGCACHE_FLAT, 663 }; 664 665 static irqreturn_t stm32_spdifrx_isr(int irq, void *devid) 666 { 667 struct stm32_spdifrx_data *spdifrx = (struct stm32_spdifrx_data *)devid; 668 struct platform_device *pdev = spdifrx->pdev; 669 unsigned int cr, mask, sr, imr; 670 unsigned int flags, sync_state; 671 int err = 0, err_xrun = 0; 672 673 regmap_read(spdifrx->regmap, STM32_SPDIFRX_SR, &sr); 674 regmap_read(spdifrx->regmap, STM32_SPDIFRX_IMR, &imr); 675 676 mask = imr & SPDIFRX_XIMR_MASK; 677 /* SERR, TERR, FERR IRQs are generated if IFEIE is set */ 678 if (mask & SPDIFRX_IMR_IFEIE) 679 mask |= (SPDIFRX_IMR_IFEIE << 1) | (SPDIFRX_IMR_IFEIE << 2); 680 681 flags = sr & mask; 682 if (!flags) { 683 dev_err(&pdev->dev, "Unexpected IRQ. rflags=%#x, imr=%#x\n", 684 sr, imr); 685 return IRQ_NONE; 686 } 687 688 /* Clear IRQs */ 689 regmap_update_bits(spdifrx->regmap, STM32_SPDIFRX_IFCR, 690 SPDIFRX_XIFCR_MASK, flags); 691 692 if (flags & SPDIFRX_SR_PERR) { 693 dev_dbg(&pdev->dev, "Parity error\n"); 694 err_xrun = 1; 695 } 696 697 if (flags & SPDIFRX_SR_OVR) { 698 dev_dbg(&pdev->dev, "Overrun error\n"); 699 err_xrun = 1; 700 } 701 702 if (flags & SPDIFRX_SR_SBD) 703 dev_dbg(&pdev->dev, "Synchronization block detected\n"); 704 705 if (flags & SPDIFRX_SR_SYNCD) { 706 dev_dbg(&pdev->dev, "Synchronization done\n"); 707 708 /* Enable spdifrx */ 709 cr = SPDIFRX_CR_SPDIFENSET(SPDIFRX_SPDIFEN_ENABLE); 710 regmap_update_bits(spdifrx->regmap, STM32_SPDIFRX_CR, 711 SPDIFRX_CR_SPDIFEN_MASK, cr); 712 } 713 714 if (flags & SPDIFRX_SR_FERR) { 715 dev_dbg(&pdev->dev, "Frame error\n"); 716 err = 1; 717 } 718 719 if (flags & SPDIFRX_SR_SERR) { 720 dev_dbg(&pdev->dev, "Synchronization error\n"); 721 err = 1; 722 } 723 724 if (flags & SPDIFRX_SR_TERR) { 725 dev_dbg(&pdev->dev, "Timeout error\n"); 726 err = 1; 727 } 728 729 if (err) { 730 regmap_read(spdifrx->regmap, STM32_SPDIFRX_CR, &cr); 731 sync_state = FIELD_GET(SPDIFRX_CR_SPDIFEN_MASK, cr) && 732 SPDIFRX_SPDIFEN_SYNC; 733 734 /* SPDIFRX is in STATE_STOP. Disable SPDIFRX to clear errors */ 735 cr = SPDIFRX_CR_SPDIFENSET(SPDIFRX_SPDIFEN_DISABLE); 736 regmap_update_bits(spdifrx->regmap, STM32_SPDIFRX_CR, 737 SPDIFRX_CR_SPDIFEN_MASK, cr); 738 739 /* If SPDIFRX was in STATE_SYNC, retry synchro */ 740 if (sync_state) { 741 cr = SPDIFRX_CR_SPDIFENSET(SPDIFRX_SPDIFEN_SYNC); 742 regmap_update_bits(spdifrx->regmap, STM32_SPDIFRX_CR, 743 SPDIFRX_CR_SPDIFEN_MASK, cr); 744 return IRQ_HANDLED; 745 } 746 747 spin_lock(&spdifrx->irq_lock); 748 if (spdifrx->substream) 749 snd_pcm_stop(spdifrx->substream, 750 SNDRV_PCM_STATE_DISCONNECTED); 751 spin_unlock(&spdifrx->irq_lock); 752 753 return IRQ_HANDLED; 754 } 755 756 spin_lock(&spdifrx->irq_lock); 757 if (err_xrun && spdifrx->substream) 758 snd_pcm_stop_xrun(spdifrx->substream); 759 spin_unlock(&spdifrx->irq_lock); 760 761 return IRQ_HANDLED; 762 } 763 764 static int stm32_spdifrx_startup(struct snd_pcm_substream *substream, 765 struct snd_soc_dai *cpu_dai) 766 { 767 struct stm32_spdifrx_data *spdifrx = snd_soc_dai_get_drvdata(cpu_dai); 768 unsigned long flags; 769 int ret; 770 771 spin_lock_irqsave(&spdifrx->irq_lock, flags); 772 spdifrx->substream = substream; 773 spin_unlock_irqrestore(&spdifrx->irq_lock, flags); 774 775 ret = clk_prepare_enable(spdifrx->kclk); 776 if (ret) 777 dev_err(&spdifrx->pdev->dev, "Enable kclk failed: %d\n", ret); 778 779 return ret; 780 } 781 782 static int stm32_spdifrx_hw_params(struct snd_pcm_substream *substream, 783 struct snd_pcm_hw_params *params, 784 struct snd_soc_dai *cpu_dai) 785 { 786 struct stm32_spdifrx_data *spdifrx = snd_soc_dai_get_drvdata(cpu_dai); 787 int data_size = params_width(params); 788 int fmt; 789 790 switch (data_size) { 791 case 16: 792 fmt = SPDIFRX_DRFMT_PACKED; 793 break; 794 case 32: 795 fmt = SPDIFRX_DRFMT_LEFT; 796 break; 797 default: 798 dev_err(&spdifrx->pdev->dev, "Unexpected data format\n"); 799 return -EINVAL; 800 } 801 802 /* 803 * Set buswidth to 4 bytes for all data formats. 804 * Packed format: transfer 2 x 2 bytes samples 805 * Left format: transfer 1 x 3 bytes samples + 1 dummy byte 806 */ 807 spdifrx->dma_params.addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES; 808 snd_soc_dai_init_dma_data(cpu_dai, NULL, &spdifrx->dma_params); 809 810 return regmap_update_bits(spdifrx->regmap, STM32_SPDIFRX_CR, 811 SPDIFRX_CR_DRFMT_MASK, 812 SPDIFRX_CR_DRFMTSET(fmt)); 813 } 814 815 static int stm32_spdifrx_trigger(struct snd_pcm_substream *substream, int cmd, 816 struct snd_soc_dai *cpu_dai) 817 { 818 struct stm32_spdifrx_data *spdifrx = snd_soc_dai_get_drvdata(cpu_dai); 819 int ret = 0; 820 821 switch (cmd) { 822 case SNDRV_PCM_TRIGGER_START: 823 case SNDRV_PCM_TRIGGER_RESUME: 824 case SNDRV_PCM_TRIGGER_PAUSE_RELEASE: 825 regmap_update_bits(spdifrx->regmap, STM32_SPDIFRX_IMR, 826 SPDIFRX_IMR_OVRIE, SPDIFRX_IMR_OVRIE); 827 828 regmap_update_bits(spdifrx->regmap, STM32_SPDIFRX_CR, 829 SPDIFRX_CR_RXDMAEN, SPDIFRX_CR_RXDMAEN); 830 831 ret = stm32_spdifrx_start_sync(spdifrx); 832 break; 833 case SNDRV_PCM_TRIGGER_SUSPEND: 834 case SNDRV_PCM_TRIGGER_PAUSE_PUSH: 835 case SNDRV_PCM_TRIGGER_STOP: 836 stm32_spdifrx_stop(spdifrx); 837 break; 838 default: 839 return -EINVAL; 840 } 841 842 return ret; 843 } 844 845 static void stm32_spdifrx_shutdown(struct snd_pcm_substream *substream, 846 struct snd_soc_dai *cpu_dai) 847 { 848 struct stm32_spdifrx_data *spdifrx = snd_soc_dai_get_drvdata(cpu_dai); 849 unsigned long flags; 850 851 spin_lock_irqsave(&spdifrx->irq_lock, flags); 852 spdifrx->substream = NULL; 853 spin_unlock_irqrestore(&spdifrx->irq_lock, flags); 854 855 clk_disable_unprepare(spdifrx->kclk); 856 } 857 858 static const struct snd_soc_dai_ops stm32_spdifrx_pcm_dai_ops = { 859 .startup = stm32_spdifrx_startup, 860 .hw_params = stm32_spdifrx_hw_params, 861 .trigger = stm32_spdifrx_trigger, 862 .shutdown = stm32_spdifrx_shutdown, 863 }; 864 865 static struct snd_soc_dai_driver stm32_spdifrx_dai[] = { 866 { 867 .probe = stm32_spdifrx_dai_probe, 868 .capture = { 869 .stream_name = "CPU-Capture", 870 .channels_min = 1, 871 .channels_max = 2, 872 .rates = SNDRV_PCM_RATE_8000_192000, 873 .formats = SNDRV_PCM_FMTBIT_S32_LE | 874 SNDRV_PCM_FMTBIT_S16_LE, 875 }, 876 .ops = &stm32_spdifrx_pcm_dai_ops, 877 } 878 }; 879 880 static const struct snd_pcm_hardware stm32_spdifrx_pcm_hw = { 881 .info = SNDRV_PCM_INFO_INTERLEAVED | SNDRV_PCM_INFO_MMAP, 882 .buffer_bytes_max = 8 * PAGE_SIZE, 883 .period_bytes_min = 1024, 884 .period_bytes_max = 4 * PAGE_SIZE, 885 .periods_min = 2, 886 .periods_max = 8, 887 }; 888 889 static const struct snd_soc_component_driver stm32_spdifrx_component = { 890 .name = "stm32-spdifrx", 891 }; 892 893 static const struct snd_dmaengine_pcm_config stm32_spdifrx_pcm_config = { 894 .pcm_hardware = &stm32_spdifrx_pcm_hw, 895 .prepare_slave_config = snd_dmaengine_pcm_prepare_slave_config, 896 }; 897 898 static const struct of_device_id stm32_spdifrx_ids[] = { 899 { 900 .compatible = "st,stm32h7-spdifrx", 901 .data = &stm32_h7_spdifrx_regmap_conf 902 }, 903 {} 904 }; 905 906 static int stm32_spdifrx_parse_of(struct platform_device *pdev, 907 struct stm32_spdifrx_data *spdifrx) 908 { 909 struct device_node *np = pdev->dev.of_node; 910 const struct of_device_id *of_id; 911 struct resource *res; 912 913 if (!np) 914 return -ENODEV; 915 916 of_id = of_match_device(stm32_spdifrx_ids, &pdev->dev); 917 if (of_id) 918 spdifrx->regmap_conf = 919 (const struct regmap_config *)of_id->data; 920 else 921 return -EINVAL; 922 923 spdifrx->base = devm_platform_get_and_ioremap_resource(pdev, 0, &res); 924 if (IS_ERR(spdifrx->base)) 925 return PTR_ERR(spdifrx->base); 926 927 spdifrx->phys_addr = res->start; 928 929 spdifrx->kclk = devm_clk_get(&pdev->dev, "kclk"); 930 if (IS_ERR(spdifrx->kclk)) 931 return dev_err_probe(&pdev->dev, PTR_ERR(spdifrx->kclk), 932 "Could not get kclk\n"); 933 934 spdifrx->irq = platform_get_irq(pdev, 0); 935 if (spdifrx->irq < 0) 936 return spdifrx->irq; 937 938 return 0; 939 } 940 941 static int stm32_spdifrx_remove(struct platform_device *pdev) 942 { 943 struct stm32_spdifrx_data *spdifrx = platform_get_drvdata(pdev); 944 945 if (spdifrx->ctrl_chan) 946 dma_release_channel(spdifrx->ctrl_chan); 947 948 if (spdifrx->dmab) 949 snd_dma_free_pages(spdifrx->dmab); 950 951 snd_dmaengine_pcm_unregister(&pdev->dev); 952 snd_soc_unregister_component(&pdev->dev); 953 pm_runtime_disable(&pdev->dev); 954 955 return 0; 956 } 957 958 static int stm32_spdifrx_probe(struct platform_device *pdev) 959 { 960 struct stm32_spdifrx_data *spdifrx; 961 struct reset_control *rst; 962 const struct snd_dmaengine_pcm_config *pcm_config = NULL; 963 u32 ver, idr; 964 int ret; 965 966 spdifrx = devm_kzalloc(&pdev->dev, sizeof(*spdifrx), GFP_KERNEL); 967 if (!spdifrx) 968 return -ENOMEM; 969 970 spdifrx->pdev = pdev; 971 init_completion(&spdifrx->cs_completion); 972 spin_lock_init(&spdifrx->lock); 973 spin_lock_init(&spdifrx->irq_lock); 974 975 platform_set_drvdata(pdev, spdifrx); 976 977 ret = stm32_spdifrx_parse_of(pdev, spdifrx); 978 if (ret) 979 return ret; 980 981 spdifrx->regmap = devm_regmap_init_mmio_clk(&pdev->dev, "kclk", 982 spdifrx->base, 983 spdifrx->regmap_conf); 984 if (IS_ERR(spdifrx->regmap)) 985 return dev_err_probe(&pdev->dev, PTR_ERR(spdifrx->regmap), 986 "Regmap init error\n"); 987 988 ret = devm_request_irq(&pdev->dev, spdifrx->irq, stm32_spdifrx_isr, 0, 989 dev_name(&pdev->dev), spdifrx); 990 if (ret) { 991 dev_err(&pdev->dev, "IRQ request returned %d\n", ret); 992 return ret; 993 } 994 995 rst = devm_reset_control_get_optional_exclusive(&pdev->dev, NULL); 996 if (IS_ERR(rst)) 997 return dev_err_probe(&pdev->dev, PTR_ERR(rst), 998 "Reset controller error\n"); 999 1000 reset_control_assert(rst); 1001 udelay(2); 1002 reset_control_deassert(rst); 1003 1004 pm_runtime_enable(&pdev->dev); 1005 1006 pcm_config = &stm32_spdifrx_pcm_config; 1007 ret = snd_dmaengine_pcm_register(&pdev->dev, pcm_config, 0); 1008 if (ret) 1009 return dev_err_probe(&pdev->dev, ret, "PCM DMA register error\n"); 1010 1011 ret = snd_soc_register_component(&pdev->dev, 1012 &stm32_spdifrx_component, 1013 stm32_spdifrx_dai, 1014 ARRAY_SIZE(stm32_spdifrx_dai)); 1015 if (ret) { 1016 snd_dmaengine_pcm_unregister(&pdev->dev); 1017 return ret; 1018 } 1019 1020 ret = stm32_spdifrx_dma_ctrl_register(&pdev->dev, spdifrx); 1021 if (ret) 1022 goto error; 1023 1024 ret = regmap_read(spdifrx->regmap, STM32_SPDIFRX_IDR, &idr); 1025 if (ret) 1026 goto error; 1027 1028 if (idr == SPDIFRX_IPIDR_NUMBER) { 1029 ret = regmap_read(spdifrx->regmap, STM32_SPDIFRX_VERR, &ver); 1030 if (ret) 1031 goto error; 1032 1033 dev_dbg(&pdev->dev, "SPDIFRX version: %lu.%lu registered\n", 1034 FIELD_GET(SPDIFRX_VERR_MAJ_MASK, ver), 1035 FIELD_GET(SPDIFRX_VERR_MIN_MASK, ver)); 1036 } 1037 1038 return ret; 1039 1040 error: 1041 stm32_spdifrx_remove(pdev); 1042 1043 return ret; 1044 } 1045 1046 MODULE_DEVICE_TABLE(of, stm32_spdifrx_ids); 1047 1048 #ifdef CONFIG_PM_SLEEP 1049 static int stm32_spdifrx_suspend(struct device *dev) 1050 { 1051 struct stm32_spdifrx_data *spdifrx = dev_get_drvdata(dev); 1052 1053 regcache_cache_only(spdifrx->regmap, true); 1054 regcache_mark_dirty(spdifrx->regmap); 1055 1056 return 0; 1057 } 1058 1059 static int stm32_spdifrx_resume(struct device *dev) 1060 { 1061 struct stm32_spdifrx_data *spdifrx = dev_get_drvdata(dev); 1062 1063 regcache_cache_only(spdifrx->regmap, false); 1064 1065 return regcache_sync(spdifrx->regmap); 1066 } 1067 #endif /* CONFIG_PM_SLEEP */ 1068 1069 static const struct dev_pm_ops stm32_spdifrx_pm_ops = { 1070 SET_SYSTEM_SLEEP_PM_OPS(stm32_spdifrx_suspend, stm32_spdifrx_resume) 1071 }; 1072 1073 static struct platform_driver stm32_spdifrx_driver = { 1074 .driver = { 1075 .name = "st,stm32-spdifrx", 1076 .of_match_table = stm32_spdifrx_ids, 1077 .pm = &stm32_spdifrx_pm_ops, 1078 }, 1079 .probe = stm32_spdifrx_probe, 1080 .remove = stm32_spdifrx_remove, 1081 }; 1082 1083 module_platform_driver(stm32_spdifrx_driver); 1084 1085 MODULE_DESCRIPTION("STM32 Soc spdifrx Interface"); 1086 MODULE_AUTHOR("Olivier Moysan, <olivier.moysan@st.com>"); 1087 MODULE_ALIAS("platform:stm32-spdifrx"); 1088 MODULE_LICENSE("GPL v2"); 1089