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/delay.h> 21 #include "rsnd.h" 22 #define RSND_SSI_NAME_SIZE 16 23 24 /* 25 * SSICR 26 */ 27 #define FORCE (1u << 31) /* Fixed */ 28 #define DMEN (1u << 28) /* DMA Enable */ 29 #define UIEN (1u << 27) /* Underflow Interrupt Enable */ 30 #define OIEN (1u << 26) /* Overflow Interrupt Enable */ 31 #define IIEN (1u << 25) /* Idle Mode Interrupt Enable */ 32 #define DIEN (1u << 24) /* Data Interrupt Enable */ 33 #define CHNL_4 (1u << 22) /* Channels */ 34 #define CHNL_6 (2u << 22) /* Channels */ 35 #define CHNL_8 (3u << 22) /* Channels */ 36 #define DWL_MASK (7u << 19) /* Data Word Length mask */ 37 #define DWL_8 (0u << 19) /* Data Word Length */ 38 #define DWL_16 (1u << 19) /* Data Word Length */ 39 #define DWL_18 (2u << 19) /* Data Word Length */ 40 #define DWL_20 (3u << 19) /* Data Word Length */ 41 #define DWL_22 (4u << 19) /* Data Word Length */ 42 #define DWL_24 (5u << 19) /* Data Word Length */ 43 #define DWL_32 (6u << 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_secondary(mod, io) \ 115 (rsnd_ssi_multi_secondaries(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 int rsnd_ssi_use_busif(struct rsnd_dai_stream *io) 121 { 122 struct rsnd_mod *mod = rsnd_io_to_mod_ssi(io); 123 struct rsnd_ssi *ssi = rsnd_mod_to_ssi(mod); 124 int use_busif = 0; 125 126 if (!rsnd_ssi_is_dma_mode(mod)) 127 return 0; 128 129 if (!(rsnd_flags_has(ssi, RSND_SSI_NO_BUSIF))) 130 use_busif = 1; 131 if (rsnd_io_to_mod_src(io)) 132 use_busif = 1; 133 134 return use_busif; 135 } 136 137 static void rsnd_ssi_status_clear(struct rsnd_mod *mod) 138 { 139 rsnd_mod_write(mod, SSISR, 0); 140 } 141 142 static u32 rsnd_ssi_status_get(struct rsnd_mod *mod) 143 { 144 return rsnd_mod_read(mod, SSISR); 145 } 146 147 static void rsnd_ssi_status_check(struct rsnd_mod *mod, 148 u32 bit) 149 { 150 struct rsnd_priv *priv = rsnd_mod_to_priv(mod); 151 struct device *dev = rsnd_priv_to_dev(priv); 152 u32 status; 153 int i; 154 155 for (i = 0; i < 1024; i++) { 156 status = rsnd_ssi_status_get(mod); 157 if (status & bit) 158 return; 159 160 udelay(5); 161 } 162 163 dev_warn(dev, "%s status check failed\n", rsnd_mod_name(mod)); 164 } 165 166 static u32 rsnd_ssi_multi_secondaries(struct rsnd_dai_stream *io) 167 { 168 static const enum rsnd_mod_type types[] = { 169 RSND_MOD_SSIM1, 170 RSND_MOD_SSIM2, 171 RSND_MOD_SSIM3, 172 }; 173 int i, mask; 174 175 mask = 0; 176 for (i = 0; i < ARRAY_SIZE(types); i++) { 177 struct rsnd_mod *mod = rsnd_io_to_mod(io, types[i]); 178 179 if (!mod) 180 continue; 181 182 mask |= 1 << rsnd_mod_id(mod); 183 } 184 185 return mask; 186 } 187 188 static u32 rsnd_ssi_run_mods(struct rsnd_dai_stream *io) 189 { 190 struct rsnd_mod *ssi_mod = rsnd_io_to_mod_ssi(io); 191 struct rsnd_mod *ssi_parent_mod = rsnd_io_to_mod_ssip(io); 192 u32 mods; 193 194 mods = rsnd_ssi_multi_secondaries_runtime(io) | 195 1 << rsnd_mod_id(ssi_mod); 196 197 if (ssi_parent_mod) 198 mods |= 1 << rsnd_mod_id(ssi_parent_mod); 199 200 return mods; 201 } 202 203 u32 rsnd_ssi_multi_secondaries_runtime(struct rsnd_dai_stream *io) 204 { 205 if (rsnd_runtime_is_multi_ssi(io)) 206 return rsnd_ssi_multi_secondaries(io); 207 208 return 0; 209 } 210 211 static u32 rsnd_rdai_width_to_swl(struct rsnd_dai *rdai) 212 { 213 struct rsnd_priv *priv = rsnd_rdai_to_priv(rdai); 214 struct device *dev = rsnd_priv_to_dev(priv); 215 int width = rsnd_rdai_width_get(rdai); 216 217 switch (width) { 218 case 32: return SWL_32; 219 case 24: return SWL_24; 220 case 16: return SWL_16; 221 } 222 223 dev_err(dev, "unsupported slot width value: %d\n", width); 224 return 0; 225 } 226 227 unsigned int rsnd_ssi_clk_query(struct rsnd_dai *rdai, 228 int param1, int param2, int *idx) 229 { 230 struct rsnd_priv *priv = rsnd_rdai_to_priv(rdai); 231 static const int ssi_clk_mul_table[] = { 232 1, 2, 4, 8, 16, 6, 12, 233 }; 234 int j, ret; 235 unsigned int main_rate; 236 int width = rsnd_rdai_width_get(rdai); 237 238 for (j = 0; j < ARRAY_SIZE(ssi_clk_mul_table); j++) { 239 240 /* 241 * It will set SSIWSR.CONT here, but SSICR.CKDV = 000 242 * with it is not allowed. (SSIWSR.WS_MODE with 243 * SSICR.CKDV = 000 is not allowed either). 244 * Skip it. See SSICR.CKDV 245 */ 246 if (j == 0) 247 continue; 248 249 main_rate = width * param1 * param2 * ssi_clk_mul_table[j]; 250 251 ret = rsnd_adg_clk_query(priv, main_rate); 252 if (ret < 0) 253 continue; 254 255 if (idx) 256 *idx = j; 257 258 return main_rate; 259 } 260 261 return 0; 262 } 263 264 static int rsnd_ssi_master_clk_start(struct rsnd_mod *mod, 265 struct rsnd_dai_stream *io) 266 { 267 struct rsnd_priv *priv = rsnd_io_to_priv(io); 268 struct device *dev = rsnd_priv_to_dev(priv); 269 struct rsnd_dai *rdai = rsnd_io_to_rdai(io); 270 struct rsnd_ssi *ssi = rsnd_mod_to_ssi(mod); 271 int chan = rsnd_runtime_channel_for_ssi(io); 272 int idx, ret; 273 unsigned int main_rate; 274 unsigned int rate = rsnd_io_is_play(io) ? 275 rsnd_src_get_out_rate(priv, io) : 276 rsnd_src_get_in_rate(priv, io); 277 278 if (!rsnd_rdai_is_clk_master(rdai)) 279 return 0; 280 281 if (!rsnd_ssi_can_output_clk(mod)) 282 return 0; 283 284 if (rsnd_ssi_is_multi_secondary(mod, io)) 285 return 0; 286 287 if (rsnd_runtime_is_tdm_split(io)) 288 chan = rsnd_io_converted_chan(io); 289 290 chan = rsnd_channel_normalization(chan); 291 292 if (ssi->usrcnt > 0) { 293 if (ssi->rate != rate) { 294 dev_err(dev, "SSI parent/child should use same rate\n"); 295 return -EINVAL; 296 } 297 298 if (ssi->chan != chan) { 299 dev_err(dev, "SSI parent/child should use same chan\n"); 300 return -EINVAL; 301 } 302 303 return 0; 304 } 305 306 main_rate = rsnd_ssi_clk_query(rdai, rate, chan, &idx); 307 if (!main_rate) { 308 dev_err(dev, "unsupported clock rate\n"); 309 return -EIO; 310 } 311 312 ret = rsnd_adg_ssi_clk_try_start(mod, main_rate); 313 if (ret < 0) 314 return ret; 315 316 /* 317 * SSI clock will be output contiguously 318 * by below settings. 319 * This means, rsnd_ssi_master_clk_start() 320 * and rsnd_ssi_register_setup() are necessary 321 * for SSI parent 322 * 323 * SSICR : FORCE, SCKD, SWSD 324 * SSIWSR : CONT 325 */ 326 ssi->cr_clk = FORCE | rsnd_rdai_width_to_swl(rdai) | 327 SCKD | SWSD | CKDV(idx); 328 ssi->wsr = CONT; 329 ssi->rate = rate; 330 ssi->chan = chan; 331 332 dev_dbg(dev, "%s outputs %d chan %u Hz\n", 333 rsnd_mod_name(mod), chan, rate); 334 335 return 0; 336 } 337 338 static void rsnd_ssi_master_clk_stop(struct rsnd_mod *mod, 339 struct rsnd_dai_stream *io) 340 { 341 struct rsnd_dai *rdai = rsnd_io_to_rdai(io); 342 struct rsnd_ssi *ssi = rsnd_mod_to_ssi(mod); 343 344 if (!rsnd_rdai_is_clk_master(rdai)) 345 return; 346 347 if (!rsnd_ssi_can_output_clk(mod)) 348 return; 349 350 if (ssi->usrcnt > 1) 351 return; 352 353 ssi->cr_clk = 0; 354 ssi->rate = 0; 355 ssi->chan = 0; 356 357 rsnd_adg_ssi_clk_stop(mod); 358 } 359 360 static void rsnd_ssi_config_init(struct rsnd_mod *mod, 361 struct rsnd_dai_stream *io) 362 { 363 struct rsnd_dai *rdai = rsnd_io_to_rdai(io); 364 struct rsnd_priv *priv = rsnd_rdai_to_priv(rdai); 365 struct device *dev = rsnd_priv_to_dev(priv); 366 struct snd_pcm_runtime *runtime = rsnd_io_to_runtime(io); 367 struct rsnd_ssi *ssi = rsnd_mod_to_ssi(mod); 368 u32 cr_own = ssi->cr_own; 369 u32 cr_mode = ssi->cr_mode; 370 u32 wsr = ssi->wsr; 371 int width; 372 int is_tdm, is_tdm_split; 373 374 is_tdm = rsnd_runtime_is_tdm(io); 375 is_tdm_split = rsnd_runtime_is_tdm_split(io); 376 377 if (is_tdm) 378 dev_dbg(dev, "TDM mode\n"); 379 if (is_tdm_split) 380 dev_dbg(dev, "TDM Split mode\n"); 381 382 cr_own |= FORCE | rsnd_rdai_width_to_swl(rdai); 383 384 if (rdai->bit_clk_inv) 385 cr_own |= SCKP; 386 if (rdai->frm_clk_inv && !is_tdm) 387 cr_own |= SWSP; 388 if (rdai->data_alignment) 389 cr_own |= SDTA; 390 if (rdai->sys_delay) 391 cr_own |= DEL; 392 393 /* 394 * TDM Mode 395 * see 396 * rsnd_ssiu_init_gen2() 397 */ 398 if (is_tdm || is_tdm_split) { 399 wsr |= WS_MODE; 400 cr_own |= CHNL_8; 401 } 402 403 /* 404 * We shouldn't exchange SWSP after running. 405 * This means, parent needs to care it. 406 */ 407 if (rsnd_ssi_is_parent(mod, io)) 408 goto init_end; 409 410 if (rsnd_io_is_play(io)) 411 cr_own |= TRMD; 412 413 cr_own &= ~DWL_MASK; 414 width = snd_pcm_format_width(runtime->format); 415 if (is_tdm_split) { 416 /* 417 * The SWL and DWL bits in SSICR should be fixed at 32-bit 418 * setting when TDM split mode. 419 * see datasheet 420 * Operation :: TDM Format Split Function (TDM Split Mode) 421 */ 422 width = 32; 423 } 424 425 switch (width) { 426 case 8: 427 cr_own |= DWL_8; 428 break; 429 case 16: 430 cr_own |= DWL_16; 431 break; 432 case 24: 433 cr_own |= DWL_24; 434 break; 435 case 32: 436 cr_own |= DWL_32; 437 break; 438 } 439 440 if (rsnd_ssi_is_dma_mode(mod)) { 441 cr_mode = UIEN | OIEN | /* over/under run */ 442 DMEN; /* DMA : enable DMA */ 443 } else { 444 cr_mode = DIEN; /* PIO : enable Data interrupt */ 445 } 446 447 init_end: 448 ssi->cr_own = cr_own; 449 ssi->cr_mode = cr_mode; 450 ssi->wsr = wsr; 451 } 452 453 static void rsnd_ssi_register_setup(struct rsnd_mod *mod) 454 { 455 struct rsnd_ssi *ssi = rsnd_mod_to_ssi(mod); 456 457 rsnd_mod_write(mod, SSIWSR, ssi->wsr); 458 rsnd_mod_write(mod, SSICR, ssi->cr_own | 459 ssi->cr_clk | 460 ssi->cr_mode | 461 ssi->cr_en); 462 } 463 464 /* 465 * SSI mod common functions 466 */ 467 static int rsnd_ssi_init(struct rsnd_mod *mod, 468 struct rsnd_dai_stream *io, 469 struct rsnd_priv *priv) 470 { 471 struct rsnd_ssi *ssi = rsnd_mod_to_ssi(mod); 472 int ret; 473 474 if (!rsnd_ssi_is_run_mods(mod, io)) 475 return 0; 476 477 ret = rsnd_ssi_master_clk_start(mod, io); 478 if (ret < 0) 479 return ret; 480 481 ssi->usrcnt++; 482 483 rsnd_mod_power_on(mod); 484 485 rsnd_ssi_config_init(mod, io); 486 487 rsnd_ssi_register_setup(mod); 488 489 /* clear error status */ 490 rsnd_ssi_status_clear(mod); 491 492 return 0; 493 } 494 495 static int rsnd_ssi_quit(struct rsnd_mod *mod, 496 struct rsnd_dai_stream *io, 497 struct rsnd_priv *priv) 498 { 499 struct rsnd_ssi *ssi = rsnd_mod_to_ssi(mod); 500 struct device *dev = rsnd_priv_to_dev(priv); 501 502 if (!rsnd_ssi_is_run_mods(mod, io)) 503 return 0; 504 505 if (!ssi->usrcnt) { 506 dev_err(dev, "%s usrcnt error\n", rsnd_mod_name(mod)); 507 return -EIO; 508 } 509 510 rsnd_ssi_master_clk_stop(mod, io); 511 512 rsnd_mod_power_off(mod); 513 514 ssi->usrcnt--; 515 516 if (!ssi->usrcnt) { 517 ssi->cr_own = 0; 518 ssi->cr_mode = 0; 519 ssi->wsr = 0; 520 } 521 522 return 0; 523 } 524 525 static int rsnd_ssi_hw_params(struct rsnd_mod *mod, 526 struct rsnd_dai_stream *io, 527 struct snd_pcm_substream *substream, 528 struct snd_pcm_hw_params *params) 529 { 530 struct rsnd_dai *rdai = rsnd_io_to_rdai(io); 531 unsigned int fmt_width = snd_pcm_format_width(params_format(params)); 532 533 if (fmt_width > rdai->chan_width) { 534 struct rsnd_priv *priv = rsnd_io_to_priv(io); 535 struct device *dev = rsnd_priv_to_dev(priv); 536 537 dev_err(dev, "invalid combination of slot-width and format-data-width\n"); 538 return -EINVAL; 539 } 540 541 return 0; 542 } 543 544 static int rsnd_ssi_start(struct rsnd_mod *mod, 545 struct rsnd_dai_stream *io, 546 struct rsnd_priv *priv) 547 { 548 struct rsnd_ssi *ssi = rsnd_mod_to_ssi(mod); 549 550 if (!rsnd_ssi_is_run_mods(mod, io)) 551 return 0; 552 553 /* 554 * EN will be set via SSIU :: SSI_CONTROL 555 * if Multi channel mode 556 */ 557 if (rsnd_ssi_multi_secondaries_runtime(io)) 558 return 0; 559 560 /* 561 * EN is for data output. 562 * SSI parent EN is not needed. 563 */ 564 if (rsnd_ssi_is_parent(mod, io)) 565 return 0; 566 567 ssi->cr_en = EN; 568 569 rsnd_mod_write(mod, SSICR, ssi->cr_own | 570 ssi->cr_clk | 571 ssi->cr_mode | 572 ssi->cr_en); 573 574 return 0; 575 } 576 577 static int rsnd_ssi_stop(struct rsnd_mod *mod, 578 struct rsnd_dai_stream *io, 579 struct rsnd_priv *priv) 580 { 581 struct rsnd_ssi *ssi = rsnd_mod_to_ssi(mod); 582 u32 cr; 583 584 if (!rsnd_ssi_is_run_mods(mod, io)) 585 return 0; 586 587 if (rsnd_ssi_is_parent(mod, io)) 588 return 0; 589 590 cr = ssi->cr_own | 591 ssi->cr_clk; 592 593 /* 594 * disable all IRQ, 595 * Playback: Wait all data was sent 596 * Capture: It might not receave data. Do nothing 597 */ 598 if (rsnd_io_is_play(io)) { 599 rsnd_mod_write(mod, SSICR, cr | ssi->cr_en); 600 rsnd_ssi_status_check(mod, DIRQ); 601 } 602 603 /* In multi-SSI mode, stop is performed by setting ssi0129 in 604 * SSI_CONTROL to 0 (in rsnd_ssio_stop_gen2). Do nothing here. 605 */ 606 if (rsnd_ssi_multi_secondaries_runtime(io)) 607 return 0; 608 609 /* 610 * disable SSI, 611 * and, wait idle state 612 */ 613 rsnd_mod_write(mod, SSICR, cr); /* disabled all */ 614 rsnd_ssi_status_check(mod, IIRQ); 615 616 ssi->cr_en = 0; 617 618 return 0; 619 } 620 621 static int rsnd_ssi_irq(struct rsnd_mod *mod, 622 struct rsnd_dai_stream *io, 623 struct rsnd_priv *priv, 624 int enable) 625 { 626 u32 val = 0; 627 int is_tdm, is_tdm_split; 628 int id = rsnd_mod_id(mod); 629 630 is_tdm = rsnd_runtime_is_tdm(io); 631 is_tdm_split = rsnd_runtime_is_tdm_split(io); 632 633 if (rsnd_is_gen1(priv)) 634 return 0; 635 636 if (rsnd_ssi_is_parent(mod, io)) 637 return 0; 638 639 if (!rsnd_ssi_is_run_mods(mod, io)) 640 return 0; 641 642 if (enable) 643 val = rsnd_ssi_is_dma_mode(mod) ? 0x0e000000 : 0x0f000000; 644 645 if (is_tdm || is_tdm_split) { 646 switch (id) { 647 case 0: 648 case 1: 649 case 2: 650 case 3: 651 case 4: 652 case 9: 653 val |= 0x0000ff00; 654 break; 655 } 656 } 657 658 rsnd_mod_write(mod, SSI_INT_ENABLE, val); 659 660 return 0; 661 } 662 663 static bool rsnd_ssi_pio_interrupt(struct rsnd_mod *mod, 664 struct rsnd_dai_stream *io); 665 static void __rsnd_ssi_interrupt(struct rsnd_mod *mod, 666 struct rsnd_dai_stream *io) 667 { 668 struct rsnd_priv *priv = rsnd_mod_to_priv(mod); 669 struct device *dev = rsnd_priv_to_dev(priv); 670 int is_dma = rsnd_ssi_is_dma_mode(mod); 671 u32 status; 672 bool elapsed = false; 673 bool stop = false; 674 675 spin_lock(&priv->lock); 676 677 /* ignore all cases if not working */ 678 if (!rsnd_io_is_working(io)) 679 goto rsnd_ssi_interrupt_out; 680 681 status = rsnd_ssi_status_get(mod); 682 683 /* PIO only */ 684 if (!is_dma && (status & DIRQ)) 685 elapsed = rsnd_ssi_pio_interrupt(mod, io); 686 687 /* DMA only */ 688 if (is_dma && (status & (UIRQ | OIRQ))) { 689 rsnd_print_irq_status(dev, "%s err status : 0x%08x\n", 690 rsnd_mod_name(mod), status); 691 692 stop = true; 693 } 694 695 stop |= rsnd_ssiu_busif_err_status_clear(mod); 696 697 rsnd_ssi_status_clear(mod); 698 rsnd_ssi_interrupt_out: 699 spin_unlock(&priv->lock); 700 701 if (elapsed) 702 rsnd_dai_period_elapsed(io); 703 704 if (stop) 705 snd_pcm_stop_xrun(io->substream); 706 707 } 708 709 static irqreturn_t rsnd_ssi_interrupt(int irq, void *data) 710 { 711 struct rsnd_mod *mod = data; 712 713 rsnd_mod_interrupt(mod, __rsnd_ssi_interrupt); 714 715 return IRQ_HANDLED; 716 } 717 718 static u32 *rsnd_ssi_get_status(struct rsnd_mod *mod, 719 struct rsnd_dai_stream *io, 720 enum rsnd_mod_type type) 721 { 722 /* 723 * SSIP (= SSI parent) needs to be special, otherwise, 724 * 2nd SSI might doesn't start. see also rsnd_mod_call() 725 * 726 * We can't include parent SSI status on SSI, because we don't know 727 * how many SSI requests parent SSI. Thus, it is localed on "io" now. 728 * ex) trouble case 729 * Playback: SSI0 730 * Capture : SSI1 (needs SSI0) 731 * 732 * 1) start Capture -> SSI0/SSI1 are started. 733 * 2) start Playback -> SSI0 doesn't work, because it is already 734 * marked as "started" on 1) 735 * 736 * OTOH, using each mod's status is good for MUX case. 737 * It doesn't need to start in 2nd start 738 * ex) 739 * IO-0: SRC0 -> CTU1 -+-> MUX -> DVC -> SSIU -> SSI0 740 * | 741 * IO-1: SRC1 -> CTU2 -+ 742 * 743 * 1) start IO-0 -> start SSI0 744 * 2) start IO-1 -> SSI0 doesn't need to start, because it is 745 * already started on 1) 746 */ 747 if (type == RSND_MOD_SSIP) 748 return &io->parent_ssi_status; 749 750 return rsnd_mod_get_status(mod, io, type); 751 } 752 753 /* 754 * SSI PIO 755 */ 756 static void rsnd_ssi_parent_attach(struct rsnd_mod *mod, 757 struct rsnd_dai_stream *io) 758 { 759 struct rsnd_dai *rdai = rsnd_io_to_rdai(io); 760 struct rsnd_priv *priv = rsnd_mod_to_priv(mod); 761 762 if (!__rsnd_ssi_is_pin_sharing(mod)) 763 return; 764 765 if (!rsnd_rdai_is_clk_master(rdai)) 766 return; 767 768 if (rsnd_ssi_is_multi_secondary(mod, io)) 769 return; 770 771 switch (rsnd_mod_id(mod)) { 772 case 1: 773 case 2: 774 case 9: 775 rsnd_dai_connect(rsnd_ssi_mod_get(priv, 0), io, RSND_MOD_SSIP); 776 break; 777 case 4: 778 rsnd_dai_connect(rsnd_ssi_mod_get(priv, 3), io, RSND_MOD_SSIP); 779 break; 780 case 8: 781 rsnd_dai_connect(rsnd_ssi_mod_get(priv, 7), io, RSND_MOD_SSIP); 782 break; 783 } 784 } 785 786 static int rsnd_ssi_pcm_new(struct rsnd_mod *mod, 787 struct rsnd_dai_stream *io, 788 struct snd_soc_pcm_runtime *rtd) 789 { 790 /* 791 * rsnd_rdai_is_clk_master() will be enabled after set_fmt, 792 * and, pcm_new will be called after it. 793 * This function reuse pcm_new at this point. 794 */ 795 rsnd_ssi_parent_attach(mod, io); 796 797 return 0; 798 } 799 800 static int rsnd_ssi_common_probe(struct rsnd_mod *mod, 801 struct rsnd_dai_stream *io, 802 struct rsnd_priv *priv) 803 { 804 struct device *dev = rsnd_priv_to_dev(priv); 805 struct rsnd_ssi *ssi = rsnd_mod_to_ssi(mod); 806 int ret = 0; 807 808 /* 809 * SSIP/SSIU/IRQ are not needed on 810 * SSI Multi secondaries 811 */ 812 if (rsnd_ssi_is_multi_secondary(mod, io)) 813 return 0; 814 815 /* 816 * It can't judge ssi parent at this point 817 * see rsnd_ssi_pcm_new() 818 */ 819 820 /* 821 * SSI might be called again as PIO fallback 822 * It is easy to manual handling for IRQ request/free 823 * 824 * OTOH, this function might be called many times if platform is 825 * using MIX. It needs xxx_attach() many times on xxx_probe(). 826 * Because of it, we can't control .probe/.remove calling count by 827 * mod->status. 828 * But it don't need to call request_irq() many times. 829 * Let's control it by RSND_SSI_PROBED flag. 830 */ 831 if (!rsnd_flags_has(ssi, RSND_SSI_PROBED)) { 832 ret = request_irq(ssi->irq, 833 rsnd_ssi_interrupt, 834 IRQF_SHARED, 835 dev_name(dev), mod); 836 837 rsnd_flags_set(ssi, RSND_SSI_PROBED); 838 } 839 840 return ret; 841 } 842 843 static int rsnd_ssi_common_remove(struct rsnd_mod *mod, 844 struct rsnd_dai_stream *io, 845 struct rsnd_priv *priv) 846 { 847 struct rsnd_ssi *ssi = rsnd_mod_to_ssi(mod); 848 struct rsnd_mod *pure_ssi_mod = rsnd_io_to_mod_ssi(io); 849 850 /* Do nothing if non SSI (= SSI parent, multi SSI) mod */ 851 if (pure_ssi_mod != mod) 852 return 0; 853 854 /* PIO will request IRQ again */ 855 if (rsnd_flags_has(ssi, RSND_SSI_PROBED)) { 856 free_irq(ssi->irq, mod); 857 858 rsnd_flags_del(ssi, RSND_SSI_PROBED); 859 } 860 861 return 0; 862 } 863 864 /* 865 * SSI PIO functions 866 */ 867 static bool rsnd_ssi_pio_interrupt(struct rsnd_mod *mod, 868 struct rsnd_dai_stream *io) 869 { 870 struct snd_pcm_runtime *runtime = rsnd_io_to_runtime(io); 871 struct rsnd_ssi *ssi = rsnd_mod_to_ssi(mod); 872 u32 *buf = (u32 *)(runtime->dma_area + ssi->byte_pos); 873 int shift = 0; 874 int byte_pos; 875 bool elapsed = false; 876 877 if (snd_pcm_format_width(runtime->format) == 24) 878 shift = 8; 879 880 /* 881 * 8/16/32 data can be assesse to TDR/RDR register 882 * directly as 32bit data 883 * see rsnd_ssi_init() 884 */ 885 if (rsnd_io_is_play(io)) 886 rsnd_mod_write(mod, SSITDR, (*buf) << shift); 887 else 888 *buf = (rsnd_mod_read(mod, SSIRDR) >> shift); 889 890 byte_pos = ssi->byte_pos + sizeof(*buf); 891 892 if (byte_pos >= ssi->next_period_byte) { 893 int period_pos = byte_pos / ssi->byte_per_period; 894 895 if (period_pos >= runtime->periods) { 896 byte_pos = 0; 897 period_pos = 0; 898 } 899 900 ssi->next_period_byte = (period_pos + 1) * ssi->byte_per_period; 901 902 elapsed = true; 903 } 904 905 WRITE_ONCE(ssi->byte_pos, byte_pos); 906 907 return elapsed; 908 } 909 910 static int rsnd_ssi_pio_init(struct rsnd_mod *mod, 911 struct rsnd_dai_stream *io, 912 struct rsnd_priv *priv) 913 { 914 struct snd_pcm_runtime *runtime = rsnd_io_to_runtime(io); 915 struct rsnd_ssi *ssi = rsnd_mod_to_ssi(mod); 916 917 if (!rsnd_ssi_is_parent(mod, io)) { 918 ssi->byte_pos = 0; 919 ssi->byte_per_period = runtime->period_size * 920 runtime->channels * 921 samples_to_bytes(runtime, 1); 922 ssi->next_period_byte = ssi->byte_per_period; 923 } 924 925 return rsnd_ssi_init(mod, io, priv); 926 } 927 928 static int rsnd_ssi_pio_pointer(struct rsnd_mod *mod, 929 struct rsnd_dai_stream *io, 930 snd_pcm_uframes_t *pointer) 931 { 932 struct rsnd_ssi *ssi = rsnd_mod_to_ssi(mod); 933 struct snd_pcm_runtime *runtime = rsnd_io_to_runtime(io); 934 935 *pointer = bytes_to_frames(runtime, READ_ONCE(ssi->byte_pos)); 936 937 return 0; 938 } 939 940 static struct rsnd_mod_ops rsnd_ssi_pio_ops = { 941 .name = SSI_NAME, 942 .probe = rsnd_ssi_common_probe, 943 .remove = rsnd_ssi_common_remove, 944 .init = rsnd_ssi_pio_init, 945 .quit = rsnd_ssi_quit, 946 .start = rsnd_ssi_start, 947 .stop = rsnd_ssi_stop, 948 .irq = rsnd_ssi_irq, 949 .pointer = rsnd_ssi_pio_pointer, 950 .pcm_new = rsnd_ssi_pcm_new, 951 .hw_params = rsnd_ssi_hw_params, 952 .get_status = rsnd_ssi_get_status, 953 }; 954 955 static int rsnd_ssi_dma_probe(struct rsnd_mod *mod, 956 struct rsnd_dai_stream *io, 957 struct rsnd_priv *priv) 958 { 959 int ret; 960 961 /* 962 * SSIP/SSIU/IRQ/DMA are not needed on 963 * SSI Multi secondaries 964 */ 965 if (rsnd_ssi_is_multi_secondary(mod, io)) 966 return 0; 967 968 ret = rsnd_ssi_common_probe(mod, io, priv); 969 if (ret) 970 return ret; 971 972 /* SSI probe might be called many times in MUX multi path */ 973 ret = rsnd_dma_attach(io, mod, &io->dma); 974 975 return ret; 976 } 977 978 static int rsnd_ssi_fallback(struct rsnd_mod *mod, 979 struct rsnd_dai_stream *io, 980 struct rsnd_priv *priv) 981 { 982 struct device *dev = rsnd_priv_to_dev(priv); 983 984 /* 985 * fallback to PIO 986 * 987 * SSI .probe might be called again. 988 * see 989 * rsnd_rdai_continuance_probe() 990 */ 991 mod->ops = &rsnd_ssi_pio_ops; 992 993 dev_info(dev, "%s fallback to PIO mode\n", rsnd_mod_name(mod)); 994 995 return 0; 996 } 997 998 static struct dma_chan *rsnd_ssi_dma_req(struct rsnd_dai_stream *io, 999 struct rsnd_mod *mod) 1000 { 1001 struct rsnd_priv *priv = rsnd_mod_to_priv(mod); 1002 int is_play = rsnd_io_is_play(io); 1003 char *name; 1004 1005 /* 1006 * It should use "rcar_sound,ssiu" on DT. 1007 * But, we need to keep compatibility for old version. 1008 * 1009 * If it has "rcar_sound.ssiu", it will be used. 1010 * If not, "rcar_sound.ssi" will be used. 1011 * see 1012 * rsnd_ssiu_dma_req() 1013 * rsnd_dma_of_path() 1014 */ 1015 1016 if (rsnd_ssi_use_busif(io)) 1017 name = is_play ? "rxu" : "txu"; 1018 else 1019 name = is_play ? "rx" : "tx"; 1020 1021 return rsnd_dma_request_channel(rsnd_ssi_of_node(priv), 1022 SSI_NAME, mod, name); 1023 } 1024 1025 #ifdef CONFIG_DEBUG_FS 1026 static void rsnd_ssi_debug_info(struct seq_file *m, 1027 struct rsnd_dai_stream *io, 1028 struct rsnd_mod *mod) 1029 { 1030 struct rsnd_dai *rdai = rsnd_io_to_rdai(io); 1031 struct rsnd_ssi *ssi = rsnd_mod_to_ssi(mod); 1032 1033 seq_printf(m, "clock: %s\n", rsnd_rdai_is_clk_master(rdai) ? 1034 "provider" : "consumer"); 1035 seq_printf(m, "bit_clk_inv: %d\n", rdai->bit_clk_inv); 1036 seq_printf(m, "frm_clk_inv: %d\n", rdai->frm_clk_inv); 1037 seq_printf(m, "pin share: %d\n", __rsnd_ssi_is_pin_sharing(mod)); 1038 seq_printf(m, "can out clk: %d\n", rsnd_ssi_can_output_clk(mod)); 1039 seq_printf(m, "multi secondary: %d\n", rsnd_ssi_is_multi_secondary(mod, io)); 1040 seq_printf(m, "tdm: %d, %d\n", rsnd_runtime_is_tdm(io), 1041 rsnd_runtime_is_tdm_split(io)); 1042 seq_printf(m, "chan: %d\n", ssi->chan); 1043 seq_printf(m, "user: %d\n", ssi->usrcnt); 1044 1045 rsnd_debugfs_mod_reg_show(m, mod, RSND_GEN2_SSI, 1046 rsnd_mod_id(mod) * 0x40, 0x40); 1047 } 1048 #define DEBUG_INFO .debug_info = rsnd_ssi_debug_info 1049 #else 1050 #define DEBUG_INFO 1051 #endif 1052 1053 static struct rsnd_mod_ops rsnd_ssi_dma_ops = { 1054 .name = SSI_NAME, 1055 .dma_req = rsnd_ssi_dma_req, 1056 .probe = rsnd_ssi_dma_probe, 1057 .remove = rsnd_ssi_common_remove, 1058 .init = rsnd_ssi_init, 1059 .quit = rsnd_ssi_quit, 1060 .start = rsnd_ssi_start, 1061 .stop = rsnd_ssi_stop, 1062 .irq = rsnd_ssi_irq, 1063 .pcm_new = rsnd_ssi_pcm_new, 1064 .fallback = rsnd_ssi_fallback, 1065 .hw_params = rsnd_ssi_hw_params, 1066 .get_status = rsnd_ssi_get_status, 1067 DEBUG_INFO 1068 }; 1069 1070 int rsnd_ssi_is_dma_mode(struct rsnd_mod *mod) 1071 { 1072 return mod->ops == &rsnd_ssi_dma_ops; 1073 } 1074 1075 /* 1076 * ssi mod function 1077 */ 1078 static void rsnd_ssi_connect(struct rsnd_mod *mod, 1079 struct rsnd_dai_stream *io) 1080 { 1081 struct rsnd_dai *rdai = rsnd_io_to_rdai(io); 1082 static const enum rsnd_mod_type types[] = { 1083 RSND_MOD_SSI, 1084 RSND_MOD_SSIM1, 1085 RSND_MOD_SSIM2, 1086 RSND_MOD_SSIM3, 1087 }; 1088 enum rsnd_mod_type type; 1089 int i; 1090 1091 /* try SSI -> SSIM1 -> SSIM2 -> SSIM3 */ 1092 for (i = 0; i < ARRAY_SIZE(types); i++) { 1093 type = types[i]; 1094 if (!rsnd_io_to_mod(io, type)) { 1095 rsnd_dai_connect(mod, io, type); 1096 rsnd_rdai_channels_set(rdai, (i + 1) * 2); 1097 rsnd_rdai_ssi_lane_set(rdai, (i + 1)); 1098 return; 1099 } 1100 } 1101 } 1102 1103 void rsnd_parse_connect_ssi(struct rsnd_dai *rdai, 1104 struct device_node *playback, 1105 struct device_node *capture) 1106 { 1107 struct rsnd_priv *priv = rsnd_rdai_to_priv(rdai); 1108 struct device *dev = rsnd_priv_to_dev(priv); 1109 struct device_node *node; 1110 struct device_node *np; 1111 int i; 1112 1113 node = rsnd_ssi_of_node(priv); 1114 if (!node) 1115 return; 1116 1117 i = 0; 1118 for_each_child_of_node(node, np) { 1119 struct rsnd_mod *mod; 1120 1121 i = rsnd_node_fixed_index(dev, np, SSI_NAME, i); 1122 if (i < 0) { 1123 of_node_put(np); 1124 break; 1125 } 1126 1127 mod = rsnd_ssi_mod_get(priv, i); 1128 1129 if (np == playback) 1130 rsnd_ssi_connect(mod, &rdai->playback); 1131 if (np == capture) 1132 rsnd_ssi_connect(mod, &rdai->capture); 1133 i++; 1134 } 1135 1136 of_node_put(node); 1137 } 1138 1139 struct rsnd_mod *rsnd_ssi_mod_get(struct rsnd_priv *priv, int id) 1140 { 1141 if (WARN_ON(id < 0 || id >= rsnd_ssi_nr(priv))) 1142 id = 0; 1143 1144 return rsnd_mod_get(rsnd_ssi_get(priv, id)); 1145 } 1146 1147 int __rsnd_ssi_is_pin_sharing(struct rsnd_mod *mod) 1148 { 1149 if (!mod) 1150 return 0; 1151 1152 return !!(rsnd_flags_has(rsnd_mod_to_ssi(mod), RSND_SSI_CLK_PIN_SHARE)); 1153 } 1154 1155 int rsnd_ssi_probe(struct rsnd_priv *priv) 1156 { 1157 struct device_node *node; 1158 struct device_node *np; 1159 struct device *dev = rsnd_priv_to_dev(priv); 1160 struct rsnd_mod_ops *ops; 1161 struct clk *clk; 1162 struct rsnd_ssi *ssi; 1163 char name[RSND_SSI_NAME_SIZE]; 1164 int i, nr, ret; 1165 1166 node = rsnd_ssi_of_node(priv); 1167 if (!node) 1168 return -EINVAL; 1169 1170 nr = rsnd_node_count(priv, node, SSI_NAME); 1171 if (!nr) { 1172 ret = -EINVAL; 1173 goto rsnd_ssi_probe_done; 1174 } 1175 1176 ssi = devm_kcalloc(dev, nr, sizeof(*ssi), GFP_KERNEL); 1177 if (!ssi) { 1178 ret = -ENOMEM; 1179 goto rsnd_ssi_probe_done; 1180 } 1181 1182 priv->ssi = ssi; 1183 priv->ssi_nr = nr; 1184 1185 i = 0; 1186 for_each_child_of_node(node, np) { 1187 if (!of_device_is_available(np)) 1188 goto skip; 1189 1190 i = rsnd_node_fixed_index(dev, np, SSI_NAME, i); 1191 if (i < 0) { 1192 ret = -EINVAL; 1193 of_node_put(np); 1194 goto rsnd_ssi_probe_done; 1195 } 1196 1197 ssi = rsnd_ssi_get(priv, i); 1198 1199 snprintf(name, RSND_SSI_NAME_SIZE, "%s.%d", 1200 SSI_NAME, i); 1201 1202 clk = devm_clk_get(dev, name); 1203 if (IS_ERR(clk)) { 1204 ret = PTR_ERR(clk); 1205 of_node_put(np); 1206 goto rsnd_ssi_probe_done; 1207 } 1208 1209 if (of_get_property(np, "shared-pin", NULL)) 1210 rsnd_flags_set(ssi, RSND_SSI_CLK_PIN_SHARE); 1211 1212 if (of_get_property(np, "no-busif", NULL)) 1213 rsnd_flags_set(ssi, RSND_SSI_NO_BUSIF); 1214 1215 ssi->irq = irq_of_parse_and_map(np, 0); 1216 if (!ssi->irq) { 1217 ret = -EINVAL; 1218 of_node_put(np); 1219 goto rsnd_ssi_probe_done; 1220 } 1221 1222 if (of_property_read_bool(np, "pio-transfer")) 1223 ops = &rsnd_ssi_pio_ops; 1224 else 1225 ops = &rsnd_ssi_dma_ops; 1226 1227 ret = rsnd_mod_init(priv, rsnd_mod_get(ssi), ops, clk, 1228 RSND_MOD_SSI, i); 1229 if (ret) { 1230 of_node_put(np); 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