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