1 // SPDX-License-Identifier: GPL-2.0 2 // 3 // Renesas R-Car SSIU/SSI support 4 // 5 // Copyright (C) 2013 Renesas Solutions Corp. 6 // Kuninori Morimoto <kuninori.morimoto.gx@renesas.com> 7 // 8 // Based on fsi.c 9 // Kuninori Morimoto <morimoto.kuninori@renesas.com> 10 11 /* 12 * you can enable below define if you don't need 13 * SSI interrupt status debug message when debugging 14 * see rsnd_print_irq_status() 15 * 16 * #define RSND_DEBUG_NO_IRQ_STATUS 1 17 */ 18 19 #include <sound/simple_card_utils.h> 20 #include <linux/of.h> 21 #include <linux/of_irq.h> 22 #include <linux/delay.h> 23 #include "rsnd.h" 24 #define RSND_SSI_NAME_SIZE 16 25 26 /* 27 * SSICR 28 */ 29 #define FORCE (1u << 31) /* Fixed */ 30 #define DMEN (1u << 28) /* DMA Enable */ 31 #define UIEN (1u << 27) /* Underflow Interrupt Enable */ 32 #define OIEN (1u << 26) /* Overflow Interrupt Enable */ 33 #define IIEN (1u << 25) /* Idle Mode Interrupt Enable */ 34 #define DIEN (1u << 24) /* Data Interrupt Enable */ 35 #define CHNL_4 (1u << 22) /* Channels */ 36 #define CHNL_6 (2u << 22) /* Channels */ 37 #define CHNL_8 (3u << 22) /* Channels */ 38 #define DWL_MASK (7u << 19) /* Data Word Length mask */ 39 #define DWL_8 (0u << 19) /* Data Word Length */ 40 #define DWL_16 (1u << 19) /* Data Word Length */ 41 #define DWL_18 (2u << 19) /* Data Word Length */ 42 #define DWL_20 (3u << 19) /* Data Word Length */ 43 #define DWL_22 (4u << 19) /* Data Word Length */ 44 #define DWL_24 (5u << 19) /* Data Word Length */ 45 #define DWL_32 (6u << 19) /* Data Word Length */ 46 47 /* 48 * System word length 49 */ 50 #define SWL_16 (1 << 16) /* R/W System Word Length */ 51 #define SWL_24 (2 << 16) /* R/W System Word Length */ 52 #define SWL_32 (3 << 16) /* R/W System Word Length */ 53 54 #define SCKD (1 << 15) /* Serial Bit Clock Direction */ 55 #define SWSD (1 << 14) /* Serial WS Direction */ 56 #define SCKP (1 << 13) /* Serial Bit Clock Polarity */ 57 #define SWSP (1 << 12) /* Serial WS Polarity */ 58 #define SDTA (1 << 10) /* Serial Data Alignment */ 59 #define PDTA (1 << 9) /* Parallel Data Alignment */ 60 #define DEL (1 << 8) /* Serial Data Delay */ 61 #define CKDV(v) (v << 4) /* Serial Clock Division Ratio */ 62 #define TRMD (1 << 1) /* Transmit/Receive Mode Select */ 63 #define EN (1 << 0) /* SSI Module Enable */ 64 65 /* 66 * SSISR 67 */ 68 #define UIRQ (1 << 27) /* Underflow Error Interrupt Status */ 69 #define OIRQ (1 << 26) /* Overflow Error Interrupt Status */ 70 #define IIRQ (1 << 25) /* Idle Mode Interrupt Status */ 71 #define DIRQ (1 << 24) /* Data Interrupt Status Flag */ 72 73 /* 74 * SSIWSR 75 */ 76 #define CONT (1 << 8) /* WS Continue Function */ 77 #define WS_MODE (1 << 0) /* WS Mode */ 78 79 #define SSI_NAME "ssi" 80 81 struct rsnd_ssi { 82 struct rsnd_mod mod; 83 84 u32 flags; 85 u32 cr_own; 86 u32 cr_clk; 87 u32 cr_mode; 88 u32 cr_en; 89 u32 wsr; 90 int chan; 91 int rate; 92 int irq; 93 unsigned int usrcnt; 94 95 /* for PIO */ 96 int byte_pos; 97 int byte_per_period; 98 int next_period_byte; 99 }; 100 101 /* flags */ 102 #define RSND_SSI_CLK_PIN_SHARE (1 << 0) 103 #define RSND_SSI_NO_BUSIF (1 << 1) /* SSI+DMA without BUSIF */ 104 #define RSND_SSI_PROBED (1 << 2) 105 106 #define for_each_rsnd_ssi(pos, priv, i) \ 107 for (i = 0; \ 108 (i < rsnd_ssi_nr(priv)) && \ 109 ((pos) = ((struct rsnd_ssi *)(priv)->ssi + i)); \ 110 i++) 111 112 #define rsnd_ssi_get(priv, id) ((struct rsnd_ssi *)(priv->ssi) + id) 113 #define rsnd_ssi_nr(priv) ((priv)->ssi_nr) 114 #define rsnd_mod_to_ssi(_mod) container_of((_mod), struct rsnd_ssi, mod) 115 #define rsnd_ssi_is_parent(ssi, io) ((ssi) == rsnd_io_to_mod_ssip(io)) 116 #define rsnd_ssi_is_multi_secondary(mod, io) \ 117 (rsnd_ssi_multi_secondaries(io) & (1 << rsnd_mod_id(mod))) 118 #define rsnd_ssi_is_run_mods(mod, io) \ 119 (rsnd_ssi_run_mods(io) & (1 << rsnd_mod_id(mod))) 120 #define rsnd_ssi_can_output_clk(mod) (!__rsnd_ssi_is_pin_sharing(mod)) 121 122 int rsnd_ssi_use_busif(struct rsnd_dai_stream *io) 123 { 124 struct rsnd_mod *mod = rsnd_io_to_mod_ssi(io); 125 struct rsnd_ssi *ssi = rsnd_mod_to_ssi(mod); 126 int use_busif = 0; 127 128 if (!rsnd_ssi_is_dma_mode(mod)) 129 return 0; 130 131 if (!(rsnd_flags_has(ssi, RSND_SSI_NO_BUSIF))) 132 use_busif = 1; 133 if (rsnd_io_to_mod_src(io)) 134 use_busif = 1; 135 136 return use_busif; 137 } 138 139 static void rsnd_ssi_status_clear(struct rsnd_mod *mod) 140 { 141 rsnd_mod_write(mod, SSISR, 0); 142 } 143 144 static u32 rsnd_ssi_status_get(struct rsnd_mod *mod) 145 { 146 return rsnd_mod_read(mod, SSISR); 147 } 148 149 static void rsnd_ssi_status_check(struct rsnd_mod *mod, 150 u32 bit) 151 { 152 struct rsnd_priv *priv = rsnd_mod_to_priv(mod); 153 struct device *dev = rsnd_priv_to_dev(priv); 154 u32 status; 155 int i; 156 157 for (i = 0; i < 1024; i++) { 158 status = rsnd_ssi_status_get(mod); 159 if (status & bit) 160 return; 161 162 udelay(5); 163 } 164 165 dev_warn(dev, "%s status check failed\n", rsnd_mod_name(mod)); 166 } 167 168 static u32 rsnd_ssi_multi_secondaries(struct rsnd_dai_stream *io) 169 { 170 static const enum rsnd_mod_type types[] = { 171 RSND_MOD_SSIM1, 172 RSND_MOD_SSIM2, 173 RSND_MOD_SSIM3, 174 }; 175 int i, mask; 176 177 mask = 0; 178 for (i = 0; i < ARRAY_SIZE(types); i++) { 179 struct rsnd_mod *mod = rsnd_io_to_mod(io, types[i]); 180 181 if (!mod) 182 continue; 183 184 mask |= 1 << rsnd_mod_id(mod); 185 } 186 187 return mask; 188 } 189 190 static u32 rsnd_ssi_run_mods(struct rsnd_dai_stream *io) 191 { 192 struct rsnd_mod *ssi_mod = rsnd_io_to_mod_ssi(io); 193 struct rsnd_mod *ssi_parent_mod = rsnd_io_to_mod_ssip(io); 194 u32 mods; 195 196 mods = rsnd_ssi_multi_secondaries_runtime(io) | 197 1 << rsnd_mod_id(ssi_mod); 198 199 if (ssi_parent_mod) 200 mods |= 1 << rsnd_mod_id(ssi_parent_mod); 201 202 return mods; 203 } 204 205 u32 rsnd_ssi_multi_secondaries_runtime(struct rsnd_dai_stream *io) 206 { 207 if (rsnd_runtime_is_multi_ssi(io)) 208 return rsnd_ssi_multi_secondaries(io); 209 210 return 0; 211 } 212 213 static u32 rsnd_rdai_width_to_swl(struct rsnd_dai *rdai) 214 { 215 struct rsnd_priv *priv = rsnd_rdai_to_priv(rdai); 216 struct device *dev = rsnd_priv_to_dev(priv); 217 int width = rsnd_rdai_width_get(rdai); 218 219 switch (width) { 220 case 32: return SWL_32; 221 case 24: return SWL_24; 222 case 16: return SWL_16; 223 } 224 225 dev_err(dev, "unsupported slot width value: %d\n", width); 226 return 0; 227 } 228 229 unsigned int rsnd_ssi_clk_query(struct rsnd_dai *rdai, 230 int param1, int param2, int *idx) 231 { 232 struct rsnd_priv *priv = rsnd_rdai_to_priv(rdai); 233 static const int ssi_clk_mul_table[] = { 234 1, 2, 4, 8, 16, 6, 12, 235 }; 236 int j, ret; 237 unsigned int main_rate; 238 int width = rsnd_rdai_width_get(rdai); 239 240 for (j = 0; j < ARRAY_SIZE(ssi_clk_mul_table); j++) { 241 242 /* 243 * It will set SSIWSR.CONT here, but SSICR.CKDV = 000 244 * with it is not allowed. (SSIWSR.WS_MODE with 245 * SSICR.CKDV = 000 is not allowed either). 246 * Skip it. See SSICR.CKDV 247 */ 248 if (j == 0) 249 continue; 250 251 main_rate = width * param1 * param2 * ssi_clk_mul_table[j]; 252 253 ret = rsnd_adg_clk_query(priv, main_rate); 254 if (ret < 0) 255 continue; 256 257 if (idx) 258 *idx = j; 259 260 return main_rate; 261 } 262 263 return 0; 264 } 265 266 static int rsnd_ssi_master_clk_start(struct rsnd_mod *mod, 267 struct rsnd_dai_stream *io) 268 { 269 struct rsnd_priv *priv = rsnd_io_to_priv(io); 270 struct device *dev = rsnd_priv_to_dev(priv); 271 struct rsnd_dai *rdai = rsnd_io_to_rdai(io); 272 struct rsnd_ssi *ssi = rsnd_mod_to_ssi(mod); 273 int chan = rsnd_runtime_channel_for_ssi(io); 274 int idx, ret; 275 unsigned int main_rate; 276 unsigned int rate = rsnd_io_is_play(io) ? 277 rsnd_src_get_out_rate(priv, io) : 278 rsnd_src_get_in_rate(priv, io); 279 280 if (!rsnd_rdai_is_clk_master(rdai)) 281 return 0; 282 283 if (!rsnd_ssi_can_output_clk(mod)) 284 return 0; 285 286 if (rsnd_ssi_is_multi_secondary(mod, io)) 287 return 0; 288 289 if (rsnd_runtime_is_tdm_split(io)) 290 chan = rsnd_io_converted_chan(io); 291 292 chan = rsnd_channel_normalization(chan); 293 294 if (ssi->usrcnt > 0) { 295 if (ssi->rate != rate) { 296 dev_err(dev, "SSI parent/child should use same rate\n"); 297 return -EINVAL; 298 } 299 300 if (ssi->chan != chan) { 301 dev_err(dev, "SSI parent/child should use same chan\n"); 302 return -EINVAL; 303 } 304 305 return 0; 306 } 307 308 ret = -EIO; 309 main_rate = rsnd_ssi_clk_query(rdai, rate, chan, &idx); 310 if (!main_rate) 311 goto rate_err; 312 313 ret = rsnd_adg_ssi_clk_try_start(mod, main_rate); 314 if (ret < 0) 315 goto rate_err; 316 317 /* 318 * SSI clock will be output contiguously 319 * by below settings. 320 * This means, rsnd_ssi_master_clk_start() 321 * and rsnd_ssi_register_setup() are necessary 322 * for SSI parent 323 * 324 * SSICR : FORCE, SCKD, SWSD 325 * SSIWSR : CONT 326 */ 327 ssi->cr_clk = FORCE | rsnd_rdai_width_to_swl(rdai) | 328 SCKD | SWSD | CKDV(idx); 329 ssi->wsr = CONT; 330 ssi->rate = rate; 331 ssi->chan = chan; 332 333 dev_dbg(dev, "%s outputs %d chan %u Hz\n", 334 rsnd_mod_name(mod), chan, rate); 335 336 return 0; 337 338 rate_err: 339 dev_err(dev, "unsupported clock rate (%d)\n", rate); 340 341 return ret; 342 } 343 344 static void rsnd_ssi_master_clk_stop(struct rsnd_mod *mod, 345 struct rsnd_dai_stream *io) 346 { 347 struct rsnd_dai *rdai = rsnd_io_to_rdai(io); 348 struct rsnd_ssi *ssi = rsnd_mod_to_ssi(mod); 349 350 if (!rsnd_rdai_is_clk_master(rdai)) 351 return; 352 353 if (!rsnd_ssi_can_output_clk(mod)) 354 return; 355 356 if (ssi->usrcnt > 1) 357 return; 358 359 ssi->cr_clk = 0; 360 ssi->rate = 0; 361 ssi->chan = 0; 362 363 rsnd_adg_ssi_clk_stop(mod); 364 } 365 366 static void rsnd_ssi_config_init(struct rsnd_mod *mod, 367 struct rsnd_dai_stream *io) 368 { 369 struct rsnd_dai *rdai = rsnd_io_to_rdai(io); 370 struct rsnd_priv *priv = rsnd_rdai_to_priv(rdai); 371 struct device *dev = rsnd_priv_to_dev(priv); 372 struct snd_pcm_runtime *runtime = rsnd_io_to_runtime(io); 373 struct rsnd_ssi *ssi = rsnd_mod_to_ssi(mod); 374 u32 cr_own = ssi->cr_own; 375 u32 cr_mode = ssi->cr_mode; 376 u32 wsr = ssi->wsr; 377 int width; 378 int is_tdm, is_tdm_split; 379 380 is_tdm = rsnd_runtime_is_tdm(io); 381 is_tdm_split = rsnd_runtime_is_tdm_split(io); 382 383 if (is_tdm) 384 dev_dbg(dev, "TDM mode\n"); 385 if (is_tdm_split) 386 dev_dbg(dev, "TDM Split mode\n"); 387 388 cr_own |= FORCE | rsnd_rdai_width_to_swl(rdai); 389 390 if (rdai->bit_clk_inv) 391 cr_own |= SCKP; 392 if (rdai->frm_clk_inv && !is_tdm) 393 cr_own |= SWSP; 394 if (rdai->data_alignment) 395 cr_own |= SDTA; 396 if (rdai->sys_delay) 397 cr_own |= DEL; 398 399 /* 400 * TDM Mode 401 * see 402 * rsnd_ssiu_init_gen2() 403 */ 404 if (is_tdm || is_tdm_split) { 405 wsr |= WS_MODE; 406 cr_own |= CHNL_8; 407 } 408 409 /* 410 * We shouldn't exchange SWSP after running. 411 * This means, parent needs to care it. 412 */ 413 if (rsnd_ssi_is_parent(mod, io)) 414 goto init_end; 415 416 if (rsnd_io_is_play(io)) 417 cr_own |= TRMD; 418 419 cr_own &= ~DWL_MASK; 420 width = snd_pcm_format_width(runtime->format); 421 if (is_tdm_split) { 422 /* 423 * The SWL and DWL bits in SSICR should be fixed at 32-bit 424 * setting when TDM split mode. 425 * see datasheet 426 * Operation :: TDM Format Split Function (TDM Split Mode) 427 */ 428 width = 32; 429 } 430 431 switch (width) { 432 case 8: 433 cr_own |= DWL_8; 434 break; 435 case 16: 436 cr_own |= DWL_16; 437 break; 438 case 24: 439 cr_own |= DWL_24; 440 break; 441 case 32: 442 cr_own |= DWL_32; 443 break; 444 } 445 446 if (rsnd_ssi_is_dma_mode(mod)) { 447 cr_mode = UIEN | OIEN | /* over/under run */ 448 DMEN; /* DMA : enable DMA */ 449 } else { 450 cr_mode = DIEN; /* PIO : enable Data interrupt */ 451 } 452 453 init_end: 454 ssi->cr_own = cr_own; 455 ssi->cr_mode = cr_mode; 456 ssi->wsr = wsr; 457 } 458 459 static void rsnd_ssi_register_setup(struct rsnd_mod *mod) 460 { 461 struct rsnd_ssi *ssi = rsnd_mod_to_ssi(mod); 462 463 rsnd_mod_write(mod, SSIWSR, ssi->wsr); 464 rsnd_mod_write(mod, SSICR, ssi->cr_own | 465 ssi->cr_clk | 466 ssi->cr_mode | 467 ssi->cr_en); 468 } 469 470 /* 471 * SSI mod common functions 472 */ 473 static int rsnd_ssi_init(struct rsnd_mod *mod, 474 struct rsnd_dai_stream *io, 475 struct rsnd_priv *priv) 476 { 477 struct rsnd_ssi *ssi = rsnd_mod_to_ssi(mod); 478 int ret; 479 480 if (!rsnd_ssi_is_run_mods(mod, io)) 481 return 0; 482 483 ret = rsnd_ssi_master_clk_start(mod, io); 484 if (ret < 0) 485 return ret; 486 487 ssi->usrcnt++; 488 489 ret = rsnd_mod_power_on(mod); 490 if (ret < 0) 491 return ret; 492 493 rsnd_ssi_config_init(mod, io); 494 495 rsnd_ssi_register_setup(mod); 496 497 /* clear error status */ 498 rsnd_ssi_status_clear(mod); 499 500 return 0; 501 } 502 503 static int rsnd_ssi_quit(struct rsnd_mod *mod, 504 struct rsnd_dai_stream *io, 505 struct rsnd_priv *priv) 506 { 507 struct rsnd_ssi *ssi = rsnd_mod_to_ssi(mod); 508 struct device *dev = rsnd_priv_to_dev(priv); 509 510 if (!rsnd_ssi_is_run_mods(mod, io)) 511 return 0; 512 513 if (!ssi->usrcnt) { 514 dev_err(dev, "%s usrcnt error\n", rsnd_mod_name(mod)); 515 return -EIO; 516 } 517 518 rsnd_ssi_master_clk_stop(mod, io); 519 520 rsnd_mod_power_off(mod); 521 522 ssi->usrcnt--; 523 524 if (!ssi->usrcnt) { 525 ssi->cr_own = 0; 526 ssi->cr_mode = 0; 527 ssi->wsr = 0; 528 } 529 530 return 0; 531 } 532 533 static int rsnd_ssi_hw_params(struct rsnd_mod *mod, 534 struct rsnd_dai_stream *io, 535 struct snd_pcm_substream *substream, 536 struct snd_pcm_hw_params *params) 537 { 538 struct rsnd_dai *rdai = rsnd_io_to_rdai(io); 539 unsigned int fmt_width = snd_pcm_format_width(params_format(params)); 540 541 if (fmt_width > rdai->chan_width) { 542 struct rsnd_priv *priv = rsnd_io_to_priv(io); 543 struct device *dev = rsnd_priv_to_dev(priv); 544 545 dev_err(dev, "invalid combination of slot-width and format-data-width\n"); 546 return -EINVAL; 547 } 548 549 return 0; 550 } 551 552 static int rsnd_ssi_start(struct rsnd_mod *mod, 553 struct rsnd_dai_stream *io, 554 struct rsnd_priv *priv) 555 { 556 struct rsnd_ssi *ssi = rsnd_mod_to_ssi(mod); 557 558 if (!rsnd_ssi_is_run_mods(mod, io)) 559 return 0; 560 561 /* 562 * EN will be set via SSIU :: SSI_CONTROL 563 * if Multi channel mode 564 */ 565 if (rsnd_ssi_multi_secondaries_runtime(io)) 566 return 0; 567 568 /* 569 * EN is for data output. 570 * SSI parent EN is not needed. 571 */ 572 if (rsnd_ssi_is_parent(mod, io)) 573 return 0; 574 575 ssi->cr_en = EN; 576 577 rsnd_mod_write(mod, SSICR, ssi->cr_own | 578 ssi->cr_clk | 579 ssi->cr_mode | 580 ssi->cr_en); 581 582 return 0; 583 } 584 585 static int rsnd_ssi_stop(struct rsnd_mod *mod, 586 struct rsnd_dai_stream *io, 587 struct rsnd_priv *priv) 588 { 589 struct rsnd_ssi *ssi = rsnd_mod_to_ssi(mod); 590 u32 cr; 591 592 if (!rsnd_ssi_is_run_mods(mod, io)) 593 return 0; 594 595 if (rsnd_ssi_is_parent(mod, io)) 596 return 0; 597 598 cr = ssi->cr_own | 599 ssi->cr_clk; 600 601 /* 602 * disable all IRQ, 603 * Playback: Wait all data was sent 604 * Capture: It might not receave data. Do nothing 605 */ 606 if (rsnd_io_is_play(io)) { 607 rsnd_mod_write(mod, SSICR, cr | ssi->cr_en); 608 rsnd_ssi_status_check(mod, DIRQ); 609 } 610 611 /* In multi-SSI mode, stop is performed by setting ssi0129 in 612 * SSI_CONTROL to 0 (in rsnd_ssio_stop_gen2). Do nothing here. 613 */ 614 if (rsnd_ssi_multi_secondaries_runtime(io)) 615 return 0; 616 617 /* 618 * disable SSI, 619 * and, wait idle state 620 */ 621 rsnd_mod_write(mod, SSICR, cr); /* disabled all */ 622 rsnd_ssi_status_check(mod, IIRQ); 623 624 ssi->cr_en = 0; 625 626 return 0; 627 } 628 629 static int rsnd_ssi_irq(struct rsnd_mod *mod, 630 struct rsnd_dai_stream *io, 631 struct rsnd_priv *priv, 632 int enable) 633 { 634 u32 val = 0; 635 int is_tdm, is_tdm_split; 636 int id = rsnd_mod_id(mod); 637 638 is_tdm = rsnd_runtime_is_tdm(io); 639 is_tdm_split = rsnd_runtime_is_tdm_split(io); 640 641 if (rsnd_is_gen1(priv)) 642 return 0; 643 644 if (rsnd_ssi_is_parent(mod, io)) 645 return 0; 646 647 if (!rsnd_ssi_is_run_mods(mod, io)) 648 return 0; 649 650 if (enable) 651 val = rsnd_ssi_is_dma_mode(mod) ? 0x0e000000 : 0x0f000000; 652 653 if (is_tdm || is_tdm_split) { 654 switch (id) { 655 case 0: 656 case 1: 657 case 2: 658 case 3: 659 case 4: 660 case 9: 661 val |= 0x0000ff00; 662 break; 663 } 664 } 665 666 rsnd_mod_write(mod, SSI_INT_ENABLE, val); 667 668 return 0; 669 } 670 671 static bool rsnd_ssi_pio_interrupt(struct rsnd_mod *mod, 672 struct rsnd_dai_stream *io); 673 static void __rsnd_ssi_interrupt(struct rsnd_mod *mod, 674 struct rsnd_dai_stream *io) 675 { 676 struct rsnd_priv *priv = rsnd_mod_to_priv(mod); 677 struct device *dev = rsnd_priv_to_dev(priv); 678 int is_dma = rsnd_ssi_is_dma_mode(mod); 679 u32 status; 680 bool elapsed = false; 681 bool stop = false; 682 683 spin_lock(&priv->lock); 684 685 /* ignore all cases if not working */ 686 if (!rsnd_io_is_working(io)) 687 goto rsnd_ssi_interrupt_out; 688 689 status = rsnd_ssi_status_get(mod); 690 691 /* PIO only */ 692 if (!is_dma && (status & DIRQ)) 693 elapsed = rsnd_ssi_pio_interrupt(mod, io); 694 695 /* DMA only */ 696 if (is_dma && (status & (UIRQ | OIRQ))) { 697 rsnd_print_irq_status(dev, "%s err status : 0x%08x\n", 698 rsnd_mod_name(mod), status); 699 700 stop = true; 701 } 702 703 stop |= rsnd_ssiu_busif_err_status_clear(mod); 704 705 rsnd_ssi_status_clear(mod); 706 rsnd_ssi_interrupt_out: 707 spin_unlock(&priv->lock); 708 709 if (elapsed) 710 snd_pcm_period_elapsed(io->substream); 711 712 if (stop) 713 snd_pcm_stop_xrun(io->substream); 714 715 } 716 717 static irqreturn_t rsnd_ssi_interrupt(int irq, void *data) 718 { 719 struct rsnd_mod *mod = data; 720 721 rsnd_mod_interrupt(mod, __rsnd_ssi_interrupt); 722 723 return IRQ_HANDLED; 724 } 725 726 static u32 *rsnd_ssi_get_status(struct rsnd_mod *mod, 727 struct rsnd_dai_stream *io, 728 enum rsnd_mod_type type) 729 { 730 /* 731 * SSIP (= SSI parent) needs to be special, otherwise, 732 * 2nd SSI might doesn't start. see also rsnd_mod_call() 733 * 734 * We can't include parent SSI status on SSI, because we don't know 735 * how many SSI requests parent SSI. Thus, it is localed on "io" now. 736 * ex) trouble case 737 * Playback: SSI0 738 * Capture : SSI1 (needs SSI0) 739 * 740 * 1) start Capture -> SSI0/SSI1 are started. 741 * 2) start Playback -> SSI0 doesn't work, because it is already 742 * marked as "started" on 1) 743 * 744 * OTOH, using each mod's status is good for MUX case. 745 * It doesn't need to start in 2nd start 746 * ex) 747 * IO-0: SRC0 -> CTU1 -+-> MUX -> DVC -> SSIU -> SSI0 748 * | 749 * IO-1: SRC1 -> CTU2 -+ 750 * 751 * 1) start IO-0 -> start SSI0 752 * 2) start IO-1 -> SSI0 doesn't need to start, because it is 753 * already started on 1) 754 */ 755 if (type == RSND_MOD_SSIP) 756 return &io->parent_ssi_status; 757 758 return rsnd_mod_get_status(mod, io, type); 759 } 760 761 /* 762 * SSI PIO 763 */ 764 static void rsnd_ssi_parent_attach(struct rsnd_mod *mod, 765 struct rsnd_dai_stream *io) 766 { 767 struct rsnd_dai *rdai = rsnd_io_to_rdai(io); 768 struct rsnd_priv *priv = rsnd_mod_to_priv(mod); 769 770 if (!__rsnd_ssi_is_pin_sharing(mod)) 771 return; 772 773 if (!rsnd_rdai_is_clk_master(rdai)) 774 return; 775 776 if (rsnd_ssi_is_multi_secondary(mod, io)) 777 return; 778 779 switch (rsnd_mod_id(mod)) { 780 case 1: 781 case 2: 782 case 9: 783 rsnd_dai_connect(rsnd_ssi_mod_get(priv, 0), io, RSND_MOD_SSIP); 784 break; 785 case 4: 786 rsnd_dai_connect(rsnd_ssi_mod_get(priv, 3), io, RSND_MOD_SSIP); 787 break; 788 case 8: 789 rsnd_dai_connect(rsnd_ssi_mod_get(priv, 7), io, RSND_MOD_SSIP); 790 break; 791 } 792 } 793 794 static int rsnd_ssi_pcm_new(struct rsnd_mod *mod, 795 struct rsnd_dai_stream *io, 796 struct snd_soc_pcm_runtime *rtd) 797 { 798 /* 799 * rsnd_rdai_is_clk_master() will be enabled after set_fmt, 800 * and, pcm_new will be called after it. 801 * This function reuse pcm_new at this point. 802 */ 803 rsnd_ssi_parent_attach(mod, io); 804 805 return 0; 806 } 807 808 static int rsnd_ssi_common_probe(struct rsnd_mod *mod, 809 struct rsnd_dai_stream *io, 810 struct rsnd_priv *priv) 811 { 812 struct device *dev = rsnd_priv_to_dev(priv); 813 struct rsnd_ssi *ssi = rsnd_mod_to_ssi(mod); 814 int ret = 0; 815 816 /* 817 * SSIP/SSIU/IRQ are not needed on 818 * SSI Multi secondaries 819 */ 820 if (rsnd_ssi_is_multi_secondary(mod, io)) 821 return 0; 822 823 /* 824 * It can't judge ssi parent at this point 825 * see rsnd_ssi_pcm_new() 826 */ 827 828 /* 829 * SSI might be called again as PIO fallback 830 * It is easy to manual handling for IRQ request/free 831 * 832 * OTOH, this function might be called many times if platform is 833 * using MIX. It needs xxx_attach() many times on xxx_probe(). 834 * Because of it, we can't control .probe/.remove calling count by 835 * mod->status. 836 * But it don't need to call request_irq() many times. 837 * Let's control it by RSND_SSI_PROBED flag. 838 */ 839 if (!rsnd_flags_has(ssi, RSND_SSI_PROBED)) { 840 ret = request_irq(ssi->irq, 841 rsnd_ssi_interrupt, 842 IRQF_SHARED, 843 dev_name(dev), mod); 844 845 rsnd_flags_set(ssi, RSND_SSI_PROBED); 846 } 847 848 return ret; 849 } 850 851 static int rsnd_ssi_common_remove(struct rsnd_mod *mod, 852 struct rsnd_dai_stream *io, 853 struct rsnd_priv *priv) 854 { 855 struct rsnd_ssi *ssi = rsnd_mod_to_ssi(mod); 856 struct rsnd_mod *pure_ssi_mod = rsnd_io_to_mod_ssi(io); 857 858 /* Do nothing if non SSI (= SSI parent, multi SSI) mod */ 859 if (pure_ssi_mod != mod) 860 return 0; 861 862 /* PIO will request IRQ again */ 863 if (rsnd_flags_has(ssi, RSND_SSI_PROBED)) { 864 free_irq(ssi->irq, mod); 865 866 rsnd_flags_del(ssi, RSND_SSI_PROBED); 867 } 868 869 return 0; 870 } 871 872 /* 873 * SSI PIO functions 874 */ 875 static bool rsnd_ssi_pio_interrupt(struct rsnd_mod *mod, 876 struct rsnd_dai_stream *io) 877 { 878 struct snd_pcm_runtime *runtime = rsnd_io_to_runtime(io); 879 struct rsnd_ssi *ssi = rsnd_mod_to_ssi(mod); 880 u32 *buf = (u32 *)(runtime->dma_area + ssi->byte_pos); 881 int shift = 0; 882 int byte_pos; 883 bool elapsed = false; 884 885 if (snd_pcm_format_width(runtime->format) == 24) 886 shift = 8; 887 888 /* 889 * 8/16/32 data can be assesse to TDR/RDR register 890 * directly as 32bit data 891 * see rsnd_ssi_init() 892 */ 893 if (rsnd_io_is_play(io)) 894 rsnd_mod_write(mod, SSITDR, (*buf) << shift); 895 else 896 *buf = (rsnd_mod_read(mod, SSIRDR) >> shift); 897 898 byte_pos = ssi->byte_pos + sizeof(*buf); 899 900 if (byte_pos >= ssi->next_period_byte) { 901 int period_pos = byte_pos / ssi->byte_per_period; 902 903 if (period_pos >= runtime->periods) { 904 byte_pos = 0; 905 period_pos = 0; 906 } 907 908 ssi->next_period_byte = (period_pos + 1) * ssi->byte_per_period; 909 910 elapsed = true; 911 } 912 913 WRITE_ONCE(ssi->byte_pos, byte_pos); 914 915 return elapsed; 916 } 917 918 static int rsnd_ssi_pio_init(struct rsnd_mod *mod, 919 struct rsnd_dai_stream *io, 920 struct rsnd_priv *priv) 921 { 922 struct snd_pcm_runtime *runtime = rsnd_io_to_runtime(io); 923 struct rsnd_ssi *ssi = rsnd_mod_to_ssi(mod); 924 925 if (!rsnd_ssi_is_parent(mod, io)) { 926 ssi->byte_pos = 0; 927 ssi->byte_per_period = runtime->period_size * 928 runtime->channels * 929 samples_to_bytes(runtime, 1); 930 ssi->next_period_byte = ssi->byte_per_period; 931 } 932 933 return rsnd_ssi_init(mod, io, priv); 934 } 935 936 static int rsnd_ssi_pio_pointer(struct rsnd_mod *mod, 937 struct rsnd_dai_stream *io, 938 snd_pcm_uframes_t *pointer) 939 { 940 struct rsnd_ssi *ssi = rsnd_mod_to_ssi(mod); 941 struct snd_pcm_runtime *runtime = rsnd_io_to_runtime(io); 942 943 *pointer = bytes_to_frames(runtime, READ_ONCE(ssi->byte_pos)); 944 945 return 0; 946 } 947 948 static struct rsnd_mod_ops rsnd_ssi_pio_ops = { 949 .name = SSI_NAME, 950 .probe = rsnd_ssi_common_probe, 951 .remove = rsnd_ssi_common_remove, 952 .init = rsnd_ssi_pio_init, 953 .quit = rsnd_ssi_quit, 954 .start = rsnd_ssi_start, 955 .stop = rsnd_ssi_stop, 956 .irq = rsnd_ssi_irq, 957 .pointer = rsnd_ssi_pio_pointer, 958 .pcm_new = rsnd_ssi_pcm_new, 959 .hw_params = rsnd_ssi_hw_params, 960 .get_status = rsnd_ssi_get_status, 961 }; 962 963 static int rsnd_ssi_dma_probe(struct rsnd_mod *mod, 964 struct rsnd_dai_stream *io, 965 struct rsnd_priv *priv) 966 { 967 int ret; 968 969 /* 970 * SSIP/SSIU/IRQ/DMA are not needed on 971 * SSI Multi secondaries 972 */ 973 if (rsnd_ssi_is_multi_secondary(mod, io)) 974 return 0; 975 976 ret = rsnd_ssi_common_probe(mod, io, priv); 977 if (ret) 978 return ret; 979 980 /* SSI probe might be called many times in MUX multi path */ 981 ret = rsnd_dma_attach(io, mod, &io->dma); 982 983 return ret; 984 } 985 986 static int rsnd_ssi_fallback(struct rsnd_mod *mod, 987 struct rsnd_dai_stream *io, 988 struct rsnd_priv *priv) 989 { 990 struct device *dev = rsnd_priv_to_dev(priv); 991 992 /* 993 * fallback to PIO 994 * 995 * SSI .probe might be called again. 996 * see 997 * rsnd_rdai_continuance_probe() 998 */ 999 mod->ops = &rsnd_ssi_pio_ops; 1000 1001 dev_info(dev, "%s fallback to PIO mode\n", rsnd_mod_name(mod)); 1002 1003 return 0; 1004 } 1005 1006 static struct dma_chan *rsnd_ssi_dma_req(struct rsnd_dai_stream *io, 1007 struct rsnd_mod *mod) 1008 { 1009 struct rsnd_priv *priv = rsnd_mod_to_priv(mod); 1010 int is_play = rsnd_io_is_play(io); 1011 char *name; 1012 1013 /* 1014 * It should use "rcar_sound,ssiu" on DT. 1015 * But, we need to keep compatibility for old version. 1016 * 1017 * If it has "rcar_sound.ssiu", it will be used. 1018 * If not, "rcar_sound.ssi" will be used. 1019 * see 1020 * rsnd_ssiu_dma_req() 1021 * rsnd_dma_of_path() 1022 */ 1023 1024 if (rsnd_ssi_use_busif(io)) 1025 name = is_play ? "rxu" : "txu"; 1026 else 1027 name = is_play ? "rx" : "tx"; 1028 1029 return rsnd_dma_request_channel(rsnd_ssi_of_node(priv), 1030 SSI_NAME, mod, name); 1031 } 1032 1033 #ifdef CONFIG_DEBUG_FS 1034 static void rsnd_ssi_debug_info(struct seq_file *m, 1035 struct rsnd_dai_stream *io, 1036 struct rsnd_mod *mod) 1037 { 1038 struct rsnd_dai *rdai = rsnd_io_to_rdai(io); 1039 struct rsnd_ssi *ssi = rsnd_mod_to_ssi(mod); 1040 1041 seq_printf(m, "clock: %s\n", rsnd_rdai_is_clk_master(rdai) ? 1042 "provider" : "consumer"); 1043 seq_printf(m, "bit_clk_inv: %d\n", rdai->bit_clk_inv); 1044 seq_printf(m, "frm_clk_inv: %d\n", rdai->frm_clk_inv); 1045 seq_printf(m, "pin share: %d\n", __rsnd_ssi_is_pin_sharing(mod)); 1046 seq_printf(m, "can out clk: %d\n", rsnd_ssi_can_output_clk(mod)); 1047 seq_printf(m, "multi secondary: %d\n", rsnd_ssi_is_multi_secondary(mod, io)); 1048 seq_printf(m, "tdm: %d, %d\n", rsnd_runtime_is_tdm(io), 1049 rsnd_runtime_is_tdm_split(io)); 1050 seq_printf(m, "chan: %d\n", ssi->chan); 1051 seq_printf(m, "user: %d\n", ssi->usrcnt); 1052 1053 rsnd_debugfs_mod_reg_show(m, mod, RSND_BASE_SSI, 1054 rsnd_mod_id(mod) * 0x40, 0x40); 1055 } 1056 #define DEBUG_INFO .debug_info = rsnd_ssi_debug_info 1057 #else 1058 #define DEBUG_INFO 1059 #endif 1060 1061 static struct rsnd_mod_ops rsnd_ssi_dma_ops = { 1062 .name = SSI_NAME, 1063 .dma_req = rsnd_ssi_dma_req, 1064 .probe = rsnd_ssi_dma_probe, 1065 .remove = rsnd_ssi_common_remove, 1066 .init = rsnd_ssi_init, 1067 .quit = rsnd_ssi_quit, 1068 .start = rsnd_ssi_start, 1069 .stop = rsnd_ssi_stop, 1070 .irq = rsnd_ssi_irq, 1071 .pcm_new = rsnd_ssi_pcm_new, 1072 .fallback = rsnd_ssi_fallback, 1073 .hw_params = rsnd_ssi_hw_params, 1074 .get_status = rsnd_ssi_get_status, 1075 DEBUG_INFO 1076 }; 1077 1078 int rsnd_ssi_is_dma_mode(struct rsnd_mod *mod) 1079 { 1080 return mod->ops == &rsnd_ssi_dma_ops; 1081 } 1082 1083 /* 1084 * ssi mod function 1085 */ 1086 static void rsnd_ssi_connect(struct rsnd_mod *mod, 1087 struct rsnd_dai_stream *io) 1088 { 1089 struct rsnd_dai *rdai = rsnd_io_to_rdai(io); 1090 static const enum rsnd_mod_type types[] = { 1091 RSND_MOD_SSI, 1092 RSND_MOD_SSIM1, 1093 RSND_MOD_SSIM2, 1094 RSND_MOD_SSIM3, 1095 }; 1096 enum rsnd_mod_type type; 1097 int i; 1098 1099 /* try SSI -> SSIM1 -> SSIM2 -> SSIM3 */ 1100 for (i = 0; i < ARRAY_SIZE(types); i++) { 1101 type = types[i]; 1102 if (!rsnd_io_to_mod(io, type)) { 1103 rsnd_dai_connect(mod, io, type); 1104 rsnd_rdai_channels_set(rdai, (i + 1) * 2); 1105 rsnd_rdai_ssi_lane_set(rdai, (i + 1)); 1106 return; 1107 } 1108 } 1109 } 1110 1111 void rsnd_parse_connect_ssi(struct rsnd_dai *rdai, 1112 struct device_node *playback, 1113 struct device_node *capture) 1114 { 1115 struct rsnd_priv *priv = rsnd_rdai_to_priv(rdai); 1116 struct device *dev = rsnd_priv_to_dev(priv); 1117 struct device_node *node; 1118 int i; 1119 1120 node = rsnd_ssi_of_node(priv); 1121 if (!node) 1122 return; 1123 1124 i = 0; 1125 for_each_child_of_node_scoped(node, np) { 1126 struct rsnd_mod *mod; 1127 1128 i = rsnd_node_fixed_index(dev, np, SSI_NAME, i); 1129 if (i < 0) 1130 break; 1131 1132 mod = rsnd_ssi_mod_get(priv, i); 1133 1134 if (np == playback) 1135 rsnd_ssi_connect(mod, &rdai->playback); 1136 if (np == capture) 1137 rsnd_ssi_connect(mod, &rdai->capture); 1138 i++; 1139 } 1140 1141 of_node_put(node); 1142 } 1143 1144 struct rsnd_mod *rsnd_ssi_mod_get(struct rsnd_priv *priv, int id) 1145 { 1146 if (WARN_ON(id < 0 || id >= rsnd_ssi_nr(priv))) 1147 id = 0; 1148 1149 return rsnd_mod_get(rsnd_ssi_get(priv, id)); 1150 } 1151 1152 int __rsnd_ssi_is_pin_sharing(struct rsnd_mod *mod) 1153 { 1154 if (!mod) 1155 return 0; 1156 1157 return !!(rsnd_flags_has(rsnd_mod_to_ssi(mod), RSND_SSI_CLK_PIN_SHARE)); 1158 } 1159 1160 int rsnd_ssi_probe(struct rsnd_priv *priv) 1161 { 1162 struct device_node *node; 1163 struct device *dev = rsnd_priv_to_dev(priv); 1164 struct rsnd_mod_ops *ops; 1165 struct clk *clk; 1166 struct rsnd_ssi *ssi; 1167 char name[RSND_SSI_NAME_SIZE]; 1168 int i, nr, ret; 1169 1170 node = rsnd_ssi_of_node(priv); 1171 if (!node) 1172 return -EINVAL; 1173 1174 nr = rsnd_node_count(priv, node, SSI_NAME); 1175 if (!nr) { 1176 ret = -EINVAL; 1177 goto rsnd_ssi_probe_done; 1178 } 1179 1180 ssi = devm_kcalloc(dev, nr, sizeof(*ssi), GFP_KERNEL); 1181 if (!ssi) { 1182 ret = -ENOMEM; 1183 goto rsnd_ssi_probe_done; 1184 } 1185 1186 priv->ssi = ssi; 1187 priv->ssi_nr = nr; 1188 1189 i = 0; 1190 for_each_child_of_node_scoped(node, np) { 1191 if (!of_device_is_available(np)) 1192 goto skip; 1193 1194 i = rsnd_node_fixed_index(dev, np, SSI_NAME, i); 1195 if (i < 0) { 1196 ret = -EINVAL; 1197 goto rsnd_ssi_probe_done; 1198 } 1199 1200 ssi = rsnd_ssi_get(priv, i); 1201 1202 snprintf(name, RSND_SSI_NAME_SIZE, "%s.%d", 1203 SSI_NAME, i); 1204 1205 clk = devm_clk_get(dev, name); 1206 if (IS_ERR(clk)) { 1207 ret = PTR_ERR(clk); 1208 goto rsnd_ssi_probe_done; 1209 } 1210 1211 if (of_property_read_bool(np, "shared-pin")) 1212 rsnd_flags_set(ssi, RSND_SSI_CLK_PIN_SHARE); 1213 1214 if (of_property_read_bool(np, "no-busif")) 1215 rsnd_flags_set(ssi, RSND_SSI_NO_BUSIF); 1216 1217 ssi->irq = irq_of_parse_and_map(np, 0); 1218 if (!ssi->irq) { 1219 ret = -EINVAL; 1220 goto rsnd_ssi_probe_done; 1221 } 1222 1223 if (of_property_read_bool(np, "pio-transfer")) 1224 ops = &rsnd_ssi_pio_ops; 1225 else 1226 ops = &rsnd_ssi_dma_ops; 1227 1228 ret = rsnd_mod_init(priv, rsnd_mod_get(ssi), ops, clk, 1229 RSND_MOD_SSI, i); 1230 if (ret) 1231 goto rsnd_ssi_probe_done; 1232 1233 skip: 1234 i++; 1235 } 1236 1237 ret = 0; 1238 1239 rsnd_ssi_probe_done: 1240 of_node_put(node); 1241 1242 return ret; 1243 } 1244 1245 void rsnd_ssi_remove(struct rsnd_priv *priv) 1246 { 1247 struct rsnd_ssi *ssi; 1248 int i; 1249 1250 for_each_rsnd_ssi(ssi, priv, i) { 1251 rsnd_mod_quit(rsnd_mod_get(ssi)); 1252 } 1253 } 1254