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 (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 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 | ssi->cr_en); 598 rsnd_ssi_status_check(mod, DIRQ); 599 } 600 601 /* In multi-SSI mode, stop is performed by setting ssi0129 in 602 * SSI_CONTROL to 0 (in rsnd_ssio_stop_gen2). Do nothing here. 603 */ 604 if (rsnd_ssi_multi_slaves_runtime(io)) 605 return 0; 606 607 /* 608 * disable SSI, 609 * and, wait idle state 610 */ 611 rsnd_mod_write(mod, SSICR, cr); /* disabled all */ 612 rsnd_ssi_status_check(mod, IIRQ); 613 614 ssi->cr_en = 0; 615 616 return 0; 617 } 618 619 static int rsnd_ssi_irq(struct rsnd_mod *mod, 620 struct rsnd_dai_stream *io, 621 struct rsnd_priv *priv, 622 int enable) 623 { 624 u32 val = 0; 625 626 if (rsnd_is_gen1(priv)) 627 return 0; 628 629 if (rsnd_ssi_is_parent(mod, io)) 630 return 0; 631 632 if (!rsnd_ssi_is_run_mods(mod, io)) 633 return 0; 634 635 if (enable) 636 val = rsnd_ssi_is_dma_mode(mod) ? 0x0e000000 : 0x0f000000; 637 638 rsnd_mod_write(mod, SSI_INT_ENABLE, val); 639 640 return 0; 641 } 642 643 static bool rsnd_ssi_pio_interrupt(struct rsnd_mod *mod, 644 struct rsnd_dai_stream *io); 645 static void __rsnd_ssi_interrupt(struct rsnd_mod *mod, 646 struct rsnd_dai_stream *io) 647 { 648 struct rsnd_priv *priv = rsnd_mod_to_priv(mod); 649 struct device *dev = rsnd_priv_to_dev(priv); 650 int is_dma = rsnd_ssi_is_dma_mode(mod); 651 u32 status; 652 bool elapsed = false; 653 bool stop = false; 654 655 spin_lock(&priv->lock); 656 657 /* ignore all cases if not working */ 658 if (!rsnd_io_is_working(io)) 659 goto rsnd_ssi_interrupt_out; 660 661 status = rsnd_ssi_status_get(mod); 662 663 /* PIO only */ 664 if (!is_dma && (status & DIRQ)) 665 elapsed = rsnd_ssi_pio_interrupt(mod, io); 666 667 /* DMA only */ 668 if (is_dma && (status & (UIRQ | OIRQ))) { 669 rsnd_dbg_irq_status(dev, "%s err status : 0x%08x\n", 670 rsnd_mod_name(mod), status); 671 672 stop = true; 673 } 674 675 rsnd_ssi_status_clear(mod); 676 rsnd_ssi_interrupt_out: 677 spin_unlock(&priv->lock); 678 679 if (elapsed) 680 rsnd_dai_period_elapsed(io); 681 682 if (stop) 683 snd_pcm_stop_xrun(io->substream); 684 685 } 686 687 static irqreturn_t rsnd_ssi_interrupt(int irq, void *data) 688 { 689 struct rsnd_mod *mod = data; 690 691 rsnd_mod_interrupt(mod, __rsnd_ssi_interrupt); 692 693 return IRQ_HANDLED; 694 } 695 696 static u32 *rsnd_ssi_get_status(struct rsnd_mod *mod, 697 struct rsnd_dai_stream *io, 698 enum rsnd_mod_type type) 699 { 700 /* 701 * SSIP (= SSI parent) needs to be special, otherwise, 702 * 2nd SSI might doesn't start. see also rsnd_mod_call() 703 * 704 * We can't include parent SSI status on SSI, because we don't know 705 * how many SSI requests parent SSI. Thus, it is localed on "io" now. 706 * ex) trouble case 707 * Playback: SSI0 708 * Capture : SSI1 (needs SSI0) 709 * 710 * 1) start Capture -> SSI0/SSI1 are started. 711 * 2) start Playback -> SSI0 doesn't work, because it is already 712 * marked as "started" on 1) 713 * 714 * OTOH, using each mod's status is good for MUX case. 715 * It doesn't need to start in 2nd start 716 * ex) 717 * IO-0: SRC0 -> CTU1 -+-> MUX -> DVC -> SSIU -> SSI0 718 * | 719 * IO-1: SRC1 -> CTU2 -+ 720 * 721 * 1) start IO-0 -> start SSI0 722 * 2) start IO-1 -> SSI0 doesn't need to start, because it is 723 * already started on 1) 724 */ 725 if (type == RSND_MOD_SSIP) 726 return &io->parent_ssi_status; 727 728 return rsnd_mod_get_status(mod, io, type); 729 } 730 731 /* 732 * SSI PIO 733 */ 734 static void rsnd_ssi_parent_attach(struct rsnd_mod *mod, 735 struct rsnd_dai_stream *io) 736 { 737 struct rsnd_dai *rdai = rsnd_io_to_rdai(io); 738 struct rsnd_priv *priv = rsnd_mod_to_priv(mod); 739 740 if (!__rsnd_ssi_is_pin_sharing(mod)) 741 return; 742 743 if (!rsnd_rdai_is_clk_master(rdai)) 744 return; 745 746 if (rsnd_ssi_is_multi_slave(mod, io)) 747 return; 748 749 switch (rsnd_mod_id(mod)) { 750 case 1: 751 case 2: 752 case 9: 753 rsnd_dai_connect(rsnd_ssi_mod_get(priv, 0), io, RSND_MOD_SSIP); 754 break; 755 case 4: 756 rsnd_dai_connect(rsnd_ssi_mod_get(priv, 3), io, RSND_MOD_SSIP); 757 break; 758 case 8: 759 rsnd_dai_connect(rsnd_ssi_mod_get(priv, 7), io, RSND_MOD_SSIP); 760 break; 761 } 762 } 763 764 static int rsnd_ssi_pcm_new(struct rsnd_mod *mod, 765 struct rsnd_dai_stream *io, 766 struct snd_soc_pcm_runtime *rtd) 767 { 768 /* 769 * rsnd_rdai_is_clk_master() will be enabled after set_fmt, 770 * and, pcm_new will be called after it. 771 * This function reuse pcm_new at this point. 772 */ 773 rsnd_ssi_parent_attach(mod, io); 774 775 return 0; 776 } 777 778 static int rsnd_ssi_common_probe(struct rsnd_mod *mod, 779 struct rsnd_dai_stream *io, 780 struct rsnd_priv *priv) 781 { 782 struct device *dev = rsnd_priv_to_dev(priv); 783 struct rsnd_ssi *ssi = rsnd_mod_to_ssi(mod); 784 int ret = 0; 785 786 /* 787 * SSIP/SSIU/IRQ are not needed on 788 * SSI Multi slaves 789 */ 790 if (rsnd_ssi_is_multi_slave(mod, io)) 791 return 0; 792 793 /* 794 * It can't judge ssi parent at this point 795 * see rsnd_ssi_pcm_new() 796 */ 797 798 /* 799 * SSI might be called again as PIO fallback 800 * It is easy to manual handling for IRQ request/free 801 * 802 * OTOH, this function might be called many times if platform is 803 * using MIX. It needs xxx_attach() many times on xxx_probe(). 804 * Because of it, we can't control .probe/.remove calling count by 805 * mod->status. 806 * But it don't need to call request_irq() many times. 807 * Let's control it by RSND_SSI_PROBED flag. 808 */ 809 if (!rsnd_flags_has(ssi, RSND_SSI_PROBED)) { 810 ret = request_irq(ssi->irq, 811 rsnd_ssi_interrupt, 812 IRQF_SHARED, 813 dev_name(dev), mod); 814 815 rsnd_flags_set(ssi, RSND_SSI_PROBED); 816 } 817 818 return ret; 819 } 820 821 static int rsnd_ssi_common_remove(struct rsnd_mod *mod, 822 struct rsnd_dai_stream *io, 823 struct rsnd_priv *priv) 824 { 825 struct rsnd_ssi *ssi = rsnd_mod_to_ssi(mod); 826 struct rsnd_mod *pure_ssi_mod = rsnd_io_to_mod_ssi(io); 827 828 /* Do nothing if non SSI (= SSI parent, multi SSI) mod */ 829 if (pure_ssi_mod != mod) 830 return 0; 831 832 /* PIO will request IRQ again */ 833 if (rsnd_flags_has(ssi, RSND_SSI_PROBED)) { 834 free_irq(ssi->irq, mod); 835 836 rsnd_flags_del(ssi, RSND_SSI_PROBED); 837 } 838 839 return 0; 840 } 841 842 /* 843 * SSI PIO functions 844 */ 845 static bool rsnd_ssi_pio_interrupt(struct rsnd_mod *mod, 846 struct rsnd_dai_stream *io) 847 { 848 struct snd_pcm_runtime *runtime = rsnd_io_to_runtime(io); 849 struct rsnd_ssi *ssi = rsnd_mod_to_ssi(mod); 850 u32 *buf = (u32 *)(runtime->dma_area + ssi->byte_pos); 851 int shift = 0; 852 int byte_pos; 853 bool elapsed = false; 854 855 if (snd_pcm_format_width(runtime->format) == 24) 856 shift = 8; 857 858 /* 859 * 8/16/32 data can be assesse to TDR/RDR register 860 * directly as 32bit data 861 * see rsnd_ssi_init() 862 */ 863 if (rsnd_io_is_play(io)) 864 rsnd_mod_write(mod, SSITDR, (*buf) << shift); 865 else 866 *buf = (rsnd_mod_read(mod, SSIRDR) >> shift); 867 868 byte_pos = ssi->byte_pos + sizeof(*buf); 869 870 if (byte_pos >= ssi->next_period_byte) { 871 int period_pos = byte_pos / ssi->byte_per_period; 872 873 if (period_pos >= runtime->periods) { 874 byte_pos = 0; 875 period_pos = 0; 876 } 877 878 ssi->next_period_byte = (period_pos + 1) * ssi->byte_per_period; 879 880 elapsed = true; 881 } 882 883 WRITE_ONCE(ssi->byte_pos, byte_pos); 884 885 return elapsed; 886 } 887 888 static int rsnd_ssi_pio_init(struct rsnd_mod *mod, 889 struct rsnd_dai_stream *io, 890 struct rsnd_priv *priv) 891 { 892 struct snd_pcm_runtime *runtime = rsnd_io_to_runtime(io); 893 struct rsnd_ssi *ssi = rsnd_mod_to_ssi(mod); 894 895 if (!rsnd_ssi_is_parent(mod, io)) { 896 ssi->byte_pos = 0; 897 ssi->byte_per_period = runtime->period_size * 898 runtime->channels * 899 samples_to_bytes(runtime, 1); 900 ssi->next_period_byte = ssi->byte_per_period; 901 } 902 903 return rsnd_ssi_init(mod, io, priv); 904 } 905 906 static int rsnd_ssi_pio_pointer(struct rsnd_mod *mod, 907 struct rsnd_dai_stream *io, 908 snd_pcm_uframes_t *pointer) 909 { 910 struct rsnd_ssi *ssi = rsnd_mod_to_ssi(mod); 911 struct snd_pcm_runtime *runtime = rsnd_io_to_runtime(io); 912 913 *pointer = bytes_to_frames(runtime, READ_ONCE(ssi->byte_pos)); 914 915 return 0; 916 } 917 918 static int rsnd_ssi_prepare(struct rsnd_mod *mod, 919 struct rsnd_dai_stream *io, 920 struct rsnd_priv *priv) 921 { 922 return rsnd_ssi_master_clk_start(mod, io); 923 } 924 925 static struct rsnd_mod_ops rsnd_ssi_pio_ops = { 926 .name = SSI_NAME, 927 .probe = rsnd_ssi_common_probe, 928 .remove = rsnd_ssi_common_remove, 929 .init = rsnd_ssi_pio_init, 930 .quit = rsnd_ssi_quit, 931 .start = rsnd_ssi_start, 932 .stop = rsnd_ssi_stop, 933 .irq = rsnd_ssi_irq, 934 .pointer = rsnd_ssi_pio_pointer, 935 .pcm_new = rsnd_ssi_pcm_new, 936 .hw_params = rsnd_ssi_hw_params, 937 .prepare = rsnd_ssi_prepare, 938 .get_status = rsnd_ssi_get_status, 939 }; 940 941 static int rsnd_ssi_dma_probe(struct rsnd_mod *mod, 942 struct rsnd_dai_stream *io, 943 struct rsnd_priv *priv) 944 { 945 int ret; 946 947 /* 948 * SSIP/SSIU/IRQ/DMA are not needed on 949 * SSI Multi slaves 950 */ 951 if (rsnd_ssi_is_multi_slave(mod, io)) 952 return 0; 953 954 ret = rsnd_ssi_common_probe(mod, io, priv); 955 if (ret) 956 return ret; 957 958 /* SSI probe might be called many times in MUX multi path */ 959 ret = rsnd_dma_attach(io, mod, &io->dma); 960 961 return ret; 962 } 963 964 static int rsnd_ssi_fallback(struct rsnd_mod *mod, 965 struct rsnd_dai_stream *io, 966 struct rsnd_priv *priv) 967 { 968 struct device *dev = rsnd_priv_to_dev(priv); 969 970 /* 971 * fallback to PIO 972 * 973 * SSI .probe might be called again. 974 * see 975 * rsnd_rdai_continuance_probe() 976 */ 977 mod->ops = &rsnd_ssi_pio_ops; 978 979 dev_info(dev, "%s fallback to PIO mode\n", rsnd_mod_name(mod)); 980 981 return 0; 982 } 983 984 static struct dma_chan *rsnd_ssi_dma_req(struct rsnd_dai_stream *io, 985 struct rsnd_mod *mod) 986 { 987 struct rsnd_priv *priv = rsnd_mod_to_priv(mod); 988 int is_play = rsnd_io_is_play(io); 989 char *name; 990 991 /* 992 * It should use "rcar_sound,ssiu" on DT. 993 * But, we need to keep compatibility for old version. 994 * 995 * If it has "rcar_sound.ssiu", it will be used. 996 * If not, "rcar_sound.ssi" will be used. 997 * see 998 * rsnd_ssiu_dma_req() 999 * rsnd_dma_of_path() 1000 */ 1001 1002 if (rsnd_ssi_use_busif(io)) 1003 name = is_play ? "rxu" : "txu"; 1004 else 1005 name = is_play ? "rx" : "tx"; 1006 1007 return rsnd_dma_request_channel(rsnd_ssi_of_node(priv), 1008 mod, name); 1009 } 1010 1011 static struct rsnd_mod_ops rsnd_ssi_dma_ops = { 1012 .name = SSI_NAME, 1013 .dma_req = rsnd_ssi_dma_req, 1014 .probe = rsnd_ssi_dma_probe, 1015 .remove = rsnd_ssi_common_remove, 1016 .init = rsnd_ssi_init, 1017 .quit = rsnd_ssi_quit, 1018 .start = rsnd_ssi_start, 1019 .stop = rsnd_ssi_stop, 1020 .irq = rsnd_ssi_irq, 1021 .pcm_new = rsnd_ssi_pcm_new, 1022 .fallback = rsnd_ssi_fallback, 1023 .hw_params = rsnd_ssi_hw_params, 1024 .prepare = rsnd_ssi_prepare, 1025 .get_status = rsnd_ssi_get_status, 1026 }; 1027 1028 static int rsnd_ssi_is_dma_mode(struct rsnd_mod *mod) 1029 { 1030 return mod->ops == &rsnd_ssi_dma_ops; 1031 } 1032 1033 /* 1034 * ssi mod function 1035 */ 1036 static void rsnd_ssi_connect(struct rsnd_mod *mod, 1037 struct rsnd_dai_stream *io) 1038 { 1039 struct rsnd_dai *rdai = rsnd_io_to_rdai(io); 1040 enum rsnd_mod_type types[] = { 1041 RSND_MOD_SSI, 1042 RSND_MOD_SSIM1, 1043 RSND_MOD_SSIM2, 1044 RSND_MOD_SSIM3, 1045 }; 1046 enum rsnd_mod_type type; 1047 int i; 1048 1049 /* try SSI -> SSIM1 -> SSIM2 -> SSIM3 */ 1050 for (i = 0; i < ARRAY_SIZE(types); i++) { 1051 type = types[i]; 1052 if (!rsnd_io_to_mod(io, type)) { 1053 rsnd_dai_connect(mod, io, type); 1054 rsnd_rdai_channels_set(rdai, (i + 1) * 2); 1055 rsnd_rdai_ssi_lane_set(rdai, (i + 1)); 1056 return; 1057 } 1058 } 1059 } 1060 1061 void rsnd_parse_connect_ssi(struct rsnd_dai *rdai, 1062 struct device_node *playback, 1063 struct device_node *capture) 1064 { 1065 struct rsnd_priv *priv = rsnd_rdai_to_priv(rdai); 1066 struct device_node *node; 1067 struct device_node *np; 1068 struct rsnd_mod *mod; 1069 int i; 1070 1071 node = rsnd_ssi_of_node(priv); 1072 if (!node) 1073 return; 1074 1075 i = 0; 1076 for_each_child_of_node(node, np) { 1077 mod = rsnd_ssi_mod_get(priv, i); 1078 if (np == playback) 1079 rsnd_ssi_connect(mod, &rdai->playback); 1080 if (np == capture) 1081 rsnd_ssi_connect(mod, &rdai->capture); 1082 i++; 1083 } 1084 1085 of_node_put(node); 1086 } 1087 1088 struct rsnd_mod *rsnd_ssi_mod_get(struct rsnd_priv *priv, int id) 1089 { 1090 if (WARN_ON(id < 0 || id >= rsnd_ssi_nr(priv))) 1091 id = 0; 1092 1093 return rsnd_mod_get(rsnd_ssi_get(priv, id)); 1094 } 1095 1096 int __rsnd_ssi_is_pin_sharing(struct rsnd_mod *mod) 1097 { 1098 if (!mod) 1099 return 0; 1100 1101 return !!(rsnd_flags_has(rsnd_mod_to_ssi(mod), RSND_SSI_CLK_PIN_SHARE)); 1102 } 1103 1104 int rsnd_ssi_probe(struct rsnd_priv *priv) 1105 { 1106 struct device_node *node; 1107 struct device_node *np; 1108 struct device *dev = rsnd_priv_to_dev(priv); 1109 struct rsnd_mod_ops *ops; 1110 struct clk *clk; 1111 struct rsnd_ssi *ssi; 1112 char name[RSND_SSI_NAME_SIZE]; 1113 int i, nr, ret; 1114 1115 node = rsnd_ssi_of_node(priv); 1116 if (!node) 1117 return -EINVAL; 1118 1119 nr = of_get_child_count(node); 1120 if (!nr) { 1121 ret = -EINVAL; 1122 goto rsnd_ssi_probe_done; 1123 } 1124 1125 ssi = devm_kcalloc(dev, nr, sizeof(*ssi), GFP_KERNEL); 1126 if (!ssi) { 1127 ret = -ENOMEM; 1128 goto rsnd_ssi_probe_done; 1129 } 1130 1131 priv->ssi = ssi; 1132 priv->ssi_nr = nr; 1133 1134 i = 0; 1135 for_each_child_of_node(node, np) { 1136 if (!of_device_is_available(np)) 1137 goto skip; 1138 1139 ssi = rsnd_ssi_get(priv, i); 1140 1141 snprintf(name, RSND_SSI_NAME_SIZE, "%s.%d", 1142 SSI_NAME, i); 1143 1144 clk = devm_clk_get(dev, name); 1145 if (IS_ERR(clk)) { 1146 ret = PTR_ERR(clk); 1147 of_node_put(np); 1148 goto rsnd_ssi_probe_done; 1149 } 1150 1151 if (of_get_property(np, "shared-pin", NULL)) 1152 rsnd_flags_set(ssi, RSND_SSI_CLK_PIN_SHARE); 1153 1154 if (of_get_property(np, "no-busif", NULL)) 1155 rsnd_flags_set(ssi, RSND_SSI_NO_BUSIF); 1156 1157 ssi->irq = irq_of_parse_and_map(np, 0); 1158 if (!ssi->irq) { 1159 ret = -EINVAL; 1160 of_node_put(np); 1161 goto rsnd_ssi_probe_done; 1162 } 1163 1164 if (of_property_read_bool(np, "pio-transfer")) 1165 ops = &rsnd_ssi_pio_ops; 1166 else 1167 ops = &rsnd_ssi_dma_ops; 1168 1169 ret = rsnd_mod_init(priv, rsnd_mod_get(ssi), ops, clk, 1170 RSND_MOD_SSI, i); 1171 if (ret) { 1172 of_node_put(np); 1173 goto rsnd_ssi_probe_done; 1174 } 1175 skip: 1176 i++; 1177 } 1178 1179 ret = 0; 1180 1181 rsnd_ssi_probe_done: 1182 of_node_put(node); 1183 1184 return ret; 1185 } 1186 1187 void rsnd_ssi_remove(struct rsnd_priv *priv) 1188 { 1189 struct rsnd_ssi *ssi; 1190 int i; 1191 1192 for_each_rsnd_ssi(ssi, priv, i) { 1193 rsnd_mod_quit(rsnd_mod_get(ssi)); 1194 } 1195 } 1196