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 #define SWL_32 (3 << 16) /* R/W System Word Length */ 46 #define SCKD (1 << 15) /* Serial Bit Clock Direction */ 47 #define SWSD (1 << 14) /* Serial WS Direction */ 48 #define SCKP (1 << 13) /* Serial Bit Clock Polarity */ 49 #define SWSP (1 << 12) /* Serial WS Polarity */ 50 #define SDTA (1 << 10) /* Serial Data Alignment */ 51 #define PDTA (1 << 9) /* Parallel Data Alignment */ 52 #define DEL (1 << 8) /* Serial Data Delay */ 53 #define CKDV(v) (v << 4) /* Serial Clock Division Ratio */ 54 #define TRMD (1 << 1) /* Transmit/Receive Mode Select */ 55 #define EN (1 << 0) /* SSI Module Enable */ 56 57 /* 58 * SSISR 59 */ 60 #define UIRQ (1 << 27) /* Underflow Error Interrupt Status */ 61 #define OIRQ (1 << 26) /* Overflow Error Interrupt Status */ 62 #define IIRQ (1 << 25) /* Idle Mode Interrupt Status */ 63 #define DIRQ (1 << 24) /* Data Interrupt Status Flag */ 64 65 /* 66 * SSIWSR 67 */ 68 #define CONT (1 << 8) /* WS Continue Function */ 69 #define WS_MODE (1 << 0) /* WS Mode */ 70 71 #define SSI_NAME "ssi" 72 73 struct rsnd_ssi { 74 struct rsnd_mod mod; 75 struct rsnd_mod *dma; 76 77 u32 flags; 78 u32 cr_own; 79 u32 cr_clk; 80 u32 cr_mode; 81 u32 cr_en; 82 u32 wsr; 83 int chan; 84 int rate; 85 int irq; 86 unsigned int usrcnt; 87 88 /* for PIO */ 89 int byte_pos; 90 int byte_per_period; 91 int next_period_byte; 92 }; 93 94 /* flags */ 95 #define RSND_SSI_CLK_PIN_SHARE (1 << 0) 96 #define RSND_SSI_NO_BUSIF (1 << 1) /* SSI+DMA without BUSIF */ 97 #define RSND_SSI_HDMI0 (1 << 2) /* for HDMI0 */ 98 #define RSND_SSI_HDMI1 (1 << 3) /* for HDMI1 */ 99 #define RSND_SSI_PROBED (1 << 4) 100 101 #define for_each_rsnd_ssi(pos, priv, i) \ 102 for (i = 0; \ 103 (i < rsnd_ssi_nr(priv)) && \ 104 ((pos) = ((struct rsnd_ssi *)(priv)->ssi + i)); \ 105 i++) 106 107 #define rsnd_ssi_get(priv, id) ((struct rsnd_ssi *)(priv->ssi) + id) 108 #define rsnd_ssi_nr(priv) ((priv)->ssi_nr) 109 #define rsnd_mod_to_ssi(_mod) container_of((_mod), struct rsnd_ssi, mod) 110 #define rsnd_ssi_is_parent(ssi, io) ((ssi) == rsnd_io_to_mod_ssip(io)) 111 #define rsnd_ssi_is_multi_slave(mod, io) \ 112 (rsnd_ssi_multi_slaves(io) & (1 << rsnd_mod_id(mod))) 113 #define rsnd_ssi_is_run_mods(mod, io) \ 114 (rsnd_ssi_run_mods(io) & (1 << rsnd_mod_id(mod))) 115 #define rsnd_ssi_can_output_clk(mod) (!__rsnd_ssi_is_pin_sharing(mod)) 116 117 int rsnd_ssi_hdmi_port(struct rsnd_dai_stream *io) 118 { 119 struct rsnd_mod *mod = rsnd_io_to_mod_ssi(io); 120 struct rsnd_ssi *ssi = rsnd_mod_to_ssi(mod); 121 122 if (rsnd_flags_has(ssi, RSND_SSI_HDMI0)) 123 return RSND_SSI_HDMI_PORT0; 124 125 if (rsnd_flags_has(ssi, RSND_SSI_HDMI1)) 126 return RSND_SSI_HDMI_PORT1; 127 128 return 0; 129 } 130 131 int rsnd_ssi_use_busif(struct rsnd_dai_stream *io) 132 { 133 struct rsnd_mod *mod = rsnd_io_to_mod_ssi(io); 134 struct rsnd_ssi *ssi = rsnd_mod_to_ssi(mod); 135 int use_busif = 0; 136 137 if (!rsnd_ssi_is_dma_mode(mod)) 138 return 0; 139 140 if (!(rsnd_flags_has(ssi, RSND_SSI_NO_BUSIF))) 141 use_busif = 1; 142 if (rsnd_io_to_mod_src(io)) 143 use_busif = 1; 144 145 return use_busif; 146 } 147 148 static void rsnd_ssi_status_clear(struct rsnd_mod *mod) 149 { 150 rsnd_mod_write(mod, SSISR, 0); 151 } 152 153 static u32 rsnd_ssi_status_get(struct rsnd_mod *mod) 154 { 155 return rsnd_mod_read(mod, SSISR); 156 } 157 158 static void rsnd_ssi_status_check(struct rsnd_mod *mod, 159 u32 bit) 160 { 161 struct rsnd_priv *priv = rsnd_mod_to_priv(mod); 162 struct device *dev = rsnd_priv_to_dev(priv); 163 u32 status; 164 int i; 165 166 for (i = 0; i < 1024; i++) { 167 status = rsnd_ssi_status_get(mod); 168 if (status & bit) 169 return; 170 171 udelay(5); 172 } 173 174 dev_warn(dev, "%s[%d] status check failed\n", 175 rsnd_mod_name(mod), rsnd_mod_id(mod)); 176 } 177 178 static u32 rsnd_ssi_multi_slaves(struct rsnd_dai_stream *io) 179 { 180 struct rsnd_mod *mod; 181 enum rsnd_mod_type types[] = { 182 RSND_MOD_SSIM1, 183 RSND_MOD_SSIM2, 184 RSND_MOD_SSIM3, 185 }; 186 int i, mask; 187 188 mask = 0; 189 for (i = 0; i < ARRAY_SIZE(types); i++) { 190 mod = rsnd_io_to_mod(io, types[i]); 191 if (!mod) 192 continue; 193 194 mask |= 1 << rsnd_mod_id(mod); 195 } 196 197 return mask; 198 } 199 200 static u32 rsnd_ssi_run_mods(struct rsnd_dai_stream *io) 201 { 202 struct rsnd_mod *ssi_mod = rsnd_io_to_mod_ssi(io); 203 struct rsnd_mod *ssi_parent_mod = rsnd_io_to_mod_ssip(io); 204 u32 mods; 205 206 mods = rsnd_ssi_multi_slaves_runtime(io) | 207 1 << rsnd_mod_id(ssi_mod); 208 209 if (ssi_parent_mod) 210 mods |= 1 << rsnd_mod_id(ssi_parent_mod); 211 212 return mods; 213 } 214 215 u32 rsnd_ssi_multi_slaves_runtime(struct rsnd_dai_stream *io) 216 { 217 if (rsnd_runtime_is_ssi_multi(io)) 218 return rsnd_ssi_multi_slaves(io); 219 220 return 0; 221 } 222 223 unsigned int rsnd_ssi_clk_query(struct rsnd_priv *priv, 224 int param1, int param2, int *idx) 225 { 226 int ssi_clk_mul_table[] = { 227 1, 2, 4, 8, 16, 6, 12, 228 }; 229 int j, ret; 230 unsigned int main_rate; 231 232 for (j = 0; j < ARRAY_SIZE(ssi_clk_mul_table); j++) { 233 234 /* 235 * It will set SSIWSR.CONT here, but SSICR.CKDV = 000 236 * with it is not allowed. (SSIWSR.WS_MODE with 237 * SSICR.CKDV = 000 is not allowed either). 238 * Skip it. See SSICR.CKDV 239 */ 240 if (j == 0) 241 continue; 242 243 /* 244 * this driver is assuming that 245 * system word is 32bit x chan 246 * see rsnd_ssi_init() 247 */ 248 main_rate = 32 * param1 * param2 * ssi_clk_mul_table[j]; 249 250 ret = rsnd_adg_clk_query(priv, main_rate); 251 if (ret < 0) 252 continue; 253 254 if (idx) 255 *idx = j; 256 257 return main_rate; 258 } 259 260 return 0; 261 } 262 263 static int rsnd_ssi_master_clk_start(struct rsnd_mod *mod, 264 struct rsnd_dai_stream *io) 265 { 266 struct rsnd_priv *priv = rsnd_io_to_priv(io); 267 struct device *dev = rsnd_priv_to_dev(priv); 268 struct rsnd_dai *rdai = rsnd_io_to_rdai(io); 269 struct rsnd_ssi *ssi = rsnd_mod_to_ssi(mod); 270 int chan = rsnd_runtime_channel_for_ssi(io); 271 int idx, ret; 272 unsigned int main_rate; 273 unsigned int rate = rsnd_io_is_play(io) ? 274 rsnd_src_get_out_rate(priv, io) : 275 rsnd_src_get_in_rate(priv, io); 276 277 if (!rsnd_rdai_is_clk_master(rdai)) 278 return 0; 279 280 if (!rsnd_ssi_can_output_clk(mod)) 281 return 0; 282 283 if (rsnd_ssi_is_multi_slave(mod, io)) 284 return 0; 285 286 if (ssi->usrcnt > 1) { 287 if (ssi->rate != rate) { 288 dev_err(dev, "SSI parent/child should use same rate\n"); 289 return -EINVAL; 290 } 291 292 return 0; 293 } 294 295 main_rate = rsnd_ssi_clk_query(priv, rate, chan, &idx); 296 if (!main_rate) { 297 dev_err(dev, "unsupported clock rate\n"); 298 return -EIO; 299 } 300 301 ret = rsnd_adg_ssi_clk_try_start(mod, main_rate); 302 if (ret < 0) 303 return ret; 304 305 /* 306 * SSI clock will be output contiguously 307 * by below settings. 308 * This means, rsnd_ssi_master_clk_start() 309 * and rsnd_ssi_register_setup() are necessary 310 * for SSI parent 311 * 312 * SSICR : FORCE, SCKD, SWSD 313 * SSIWSR : CONT 314 */ 315 ssi->cr_clk = FORCE | SWL_32 | SCKD | SWSD | CKDV(idx); 316 ssi->wsr = CONT; 317 ssi->rate = rate; 318 319 dev_dbg(dev, "%s[%d] outputs %u Hz\n", 320 rsnd_mod_name(mod), 321 rsnd_mod_id(mod), rate); 322 323 return 0; 324 } 325 326 static void rsnd_ssi_master_clk_stop(struct rsnd_mod *mod, 327 struct rsnd_dai_stream *io) 328 { 329 struct rsnd_dai *rdai = rsnd_io_to_rdai(io); 330 struct rsnd_ssi *ssi = rsnd_mod_to_ssi(mod); 331 332 if (!rsnd_rdai_is_clk_master(rdai)) 333 return; 334 335 if (!rsnd_ssi_can_output_clk(mod)) 336 return; 337 338 if (ssi->usrcnt > 1) 339 return; 340 341 ssi->cr_clk = 0; 342 ssi->rate = 0; 343 344 rsnd_adg_ssi_clk_stop(mod); 345 } 346 347 static void rsnd_ssi_config_init(struct rsnd_mod *mod, 348 struct rsnd_dai_stream *io) 349 { 350 struct rsnd_dai *rdai = rsnd_io_to_rdai(io); 351 struct snd_pcm_runtime *runtime = rsnd_io_to_runtime(io); 352 struct rsnd_ssi *ssi = rsnd_mod_to_ssi(mod); 353 u32 cr_own = ssi->cr_own; 354 u32 cr_mode = ssi->cr_mode; 355 u32 wsr = ssi->wsr; 356 int is_tdm; 357 358 is_tdm = rsnd_runtime_is_ssi_tdm(io); 359 360 /* 361 * always use 32bit system word. 362 * see also rsnd_ssi_master_clk_enable() 363 */ 364 cr_own |= FORCE | SWL_32; 365 366 if (rdai->bit_clk_inv) 367 cr_own |= SCKP; 368 if (rdai->frm_clk_inv ^ is_tdm) 369 cr_own |= SWSP; 370 if (rdai->data_alignment) 371 cr_own |= SDTA; 372 if (rdai->sys_delay) 373 cr_own |= DEL; 374 375 /* 376 * We shouldn't exchange SWSP after running. 377 * This means, parent needs to care it. 378 */ 379 if (rsnd_ssi_is_parent(mod, io)) 380 goto init_end; 381 382 if (rsnd_io_is_play(io)) 383 cr_own |= TRMD; 384 385 cr_own &= ~DWL_MASK; 386 switch (snd_pcm_format_width(runtime->format)) { 387 case 16: 388 cr_own |= DWL_16; 389 break; 390 case 24: 391 cr_own |= DWL_24; 392 break; 393 } 394 395 if (rsnd_ssi_is_dma_mode(mod)) { 396 cr_mode = UIEN | OIEN | /* over/under run */ 397 DMEN; /* DMA : enable DMA */ 398 } else { 399 cr_mode = DIEN; /* PIO : enable Data interrupt */ 400 } 401 402 /* 403 * TDM Extend Mode 404 * see 405 * rsnd_ssiu_init_gen2() 406 */ 407 wsr = ssi->wsr; 408 if (is_tdm) { 409 wsr |= WS_MODE; 410 cr_own |= CHNL_8; 411 } 412 init_end: 413 ssi->cr_own = cr_own; 414 ssi->cr_mode = cr_mode; 415 ssi->wsr = wsr; 416 } 417 418 static void rsnd_ssi_register_setup(struct rsnd_mod *mod) 419 { 420 struct rsnd_ssi *ssi = rsnd_mod_to_ssi(mod); 421 422 rsnd_mod_write(mod, SSIWSR, ssi->wsr); 423 rsnd_mod_write(mod, SSICR, ssi->cr_own | 424 ssi->cr_clk | 425 ssi->cr_mode | 426 ssi->cr_en); 427 } 428 429 /* 430 * SSI mod common functions 431 */ 432 static int rsnd_ssi_init(struct rsnd_mod *mod, 433 struct rsnd_dai_stream *io, 434 struct rsnd_priv *priv) 435 { 436 struct rsnd_ssi *ssi = rsnd_mod_to_ssi(mod); 437 int ret; 438 439 if (!rsnd_ssi_is_run_mods(mod, io)) 440 return 0; 441 442 ssi->usrcnt++; 443 444 rsnd_mod_power_on(mod); 445 446 ret = rsnd_ssi_master_clk_start(mod, io); 447 if (ret < 0) 448 return ret; 449 450 rsnd_ssi_config_init(mod, io); 451 452 rsnd_ssi_register_setup(mod); 453 454 /* clear error status */ 455 rsnd_ssi_status_clear(mod); 456 457 return 0; 458 } 459 460 static int rsnd_ssi_quit(struct rsnd_mod *mod, 461 struct rsnd_dai_stream *io, 462 struct rsnd_priv *priv) 463 { 464 struct rsnd_ssi *ssi = rsnd_mod_to_ssi(mod); 465 struct device *dev = rsnd_priv_to_dev(priv); 466 467 if (!rsnd_ssi_is_run_mods(mod, io)) 468 return 0; 469 470 if (!ssi->usrcnt) { 471 dev_err(dev, "%s[%d] usrcnt error\n", 472 rsnd_mod_name(mod), rsnd_mod_id(mod)); 473 return -EIO; 474 } 475 476 rsnd_ssi_master_clk_stop(mod, io); 477 478 rsnd_mod_power_off(mod); 479 480 ssi->usrcnt--; 481 482 if (!ssi->usrcnt) { 483 ssi->cr_own = 0; 484 ssi->cr_mode = 0; 485 ssi->wsr = 0; 486 } 487 488 return 0; 489 } 490 491 static int rsnd_ssi_hw_params(struct rsnd_mod *mod, 492 struct rsnd_dai_stream *io, 493 struct snd_pcm_substream *substream, 494 struct snd_pcm_hw_params *params) 495 { 496 struct rsnd_ssi *ssi = rsnd_mod_to_ssi(mod); 497 int chan = params_channels(params); 498 499 /* 500 * snd_pcm_ops::hw_params will be called *before* 501 * snd_soc_dai_ops::trigger. Thus, ssi->usrcnt is 0 502 * in 1st call. 503 */ 504 if (ssi->usrcnt) { 505 /* 506 * Already working. 507 * It will happen if SSI has parent/child connection. 508 * it is error if child <-> parent SSI uses 509 * different channels. 510 */ 511 if (ssi->chan != chan) 512 return -EIO; 513 } 514 515 ssi->chan = chan; 516 517 return 0; 518 } 519 520 static int rsnd_ssi_start(struct rsnd_mod *mod, 521 struct rsnd_dai_stream *io, 522 struct rsnd_priv *priv) 523 { 524 struct rsnd_ssi *ssi = rsnd_mod_to_ssi(mod); 525 526 if (!rsnd_ssi_is_run_mods(mod, io)) 527 return 0; 528 529 /* 530 * EN will be set via SSIU :: SSI_CONTROL 531 * if Multi channel mode 532 */ 533 if (rsnd_ssi_multi_slaves_runtime(io)) 534 return 0; 535 536 /* 537 * EN is for data output. 538 * SSI parent EN is not needed. 539 */ 540 if (rsnd_ssi_is_parent(mod, io)) 541 return 0; 542 543 ssi->cr_en = EN; 544 545 rsnd_mod_write(mod, SSICR, ssi->cr_own | 546 ssi->cr_clk | 547 ssi->cr_mode | 548 ssi->cr_en); 549 550 return 0; 551 } 552 553 static int rsnd_ssi_stop(struct rsnd_mod *mod, 554 struct rsnd_dai_stream *io, 555 struct rsnd_priv *priv) 556 { 557 struct rsnd_ssi *ssi = rsnd_mod_to_ssi(mod); 558 u32 cr; 559 560 if (!rsnd_ssi_is_run_mods(mod, io)) 561 return 0; 562 563 if (rsnd_ssi_is_parent(mod, io)) 564 return 0; 565 566 cr = ssi->cr_own | 567 ssi->cr_clk; 568 569 /* 570 * disable all IRQ, 571 * Playback: Wait all data was sent 572 * Capture: It might not receave data. Do nothing 573 */ 574 if (rsnd_io_is_play(io)) { 575 rsnd_mod_write(mod, SSICR, cr | EN); 576 rsnd_ssi_status_check(mod, DIRQ); 577 } 578 579 /* 580 * disable SSI, 581 * and, wait idle state 582 */ 583 rsnd_mod_write(mod, SSICR, cr); /* disabled all */ 584 rsnd_ssi_status_check(mod, IIRQ); 585 586 ssi->cr_en = 0; 587 588 return 0; 589 } 590 591 static int rsnd_ssi_irq(struct rsnd_mod *mod, 592 struct rsnd_dai_stream *io, 593 struct rsnd_priv *priv, 594 int enable) 595 { 596 u32 val = 0; 597 598 if (rsnd_is_gen1(priv)) 599 return 0; 600 601 if (rsnd_ssi_is_parent(mod, io)) 602 return 0; 603 604 if (!rsnd_ssi_is_run_mods(mod, io)) 605 return 0; 606 607 if (enable) 608 val = rsnd_ssi_is_dma_mode(mod) ? 0x0e000000 : 0x0f000000; 609 610 rsnd_mod_write(mod, SSI_INT_ENABLE, val); 611 612 return 0; 613 } 614 615 static bool rsnd_ssi_pio_interrupt(struct rsnd_mod *mod, 616 struct rsnd_dai_stream *io); 617 static void __rsnd_ssi_interrupt(struct rsnd_mod *mod, 618 struct rsnd_dai_stream *io) 619 { 620 struct rsnd_priv *priv = rsnd_mod_to_priv(mod); 621 struct device *dev = rsnd_priv_to_dev(priv); 622 int is_dma = rsnd_ssi_is_dma_mode(mod); 623 u32 status; 624 bool elapsed = false; 625 bool stop = false; 626 627 spin_lock(&priv->lock); 628 629 /* ignore all cases if not working */ 630 if (!rsnd_io_is_working(io)) 631 goto rsnd_ssi_interrupt_out; 632 633 status = rsnd_ssi_status_get(mod); 634 635 /* PIO only */ 636 if (!is_dma && (status & DIRQ)) 637 elapsed = rsnd_ssi_pio_interrupt(mod, io); 638 639 /* DMA only */ 640 if (is_dma && (status & (UIRQ | OIRQ))) { 641 rsnd_dbg_irq_status(dev, "%s[%d] err status : 0x%08x\n", 642 rsnd_mod_name(mod), rsnd_mod_id(mod), status); 643 644 stop = true; 645 } 646 647 rsnd_ssi_status_clear(mod); 648 rsnd_ssi_interrupt_out: 649 spin_unlock(&priv->lock); 650 651 if (elapsed) 652 rsnd_dai_period_elapsed(io); 653 654 if (stop) 655 snd_pcm_stop_xrun(io->substream); 656 657 } 658 659 static irqreturn_t rsnd_ssi_interrupt(int irq, void *data) 660 { 661 struct rsnd_mod *mod = data; 662 663 rsnd_mod_interrupt(mod, __rsnd_ssi_interrupt); 664 665 return IRQ_HANDLED; 666 } 667 668 /* 669 * SSI PIO 670 */ 671 static void rsnd_ssi_parent_attach(struct rsnd_mod *mod, 672 struct rsnd_dai_stream *io) 673 { 674 struct rsnd_dai *rdai = rsnd_io_to_rdai(io); 675 struct rsnd_priv *priv = rsnd_mod_to_priv(mod); 676 677 if (!__rsnd_ssi_is_pin_sharing(mod)) 678 return; 679 680 if (!rsnd_rdai_is_clk_master(rdai)) 681 return; 682 683 switch (rsnd_mod_id(mod)) { 684 case 1: 685 case 2: 686 rsnd_dai_connect(rsnd_ssi_mod_get(priv, 0), io, RSND_MOD_SSIP); 687 break; 688 case 4: 689 rsnd_dai_connect(rsnd_ssi_mod_get(priv, 3), io, RSND_MOD_SSIP); 690 break; 691 case 8: 692 rsnd_dai_connect(rsnd_ssi_mod_get(priv, 7), io, RSND_MOD_SSIP); 693 break; 694 } 695 } 696 697 static int rsnd_ssi_pcm_new(struct rsnd_mod *mod, 698 struct rsnd_dai_stream *io, 699 struct snd_soc_pcm_runtime *rtd) 700 { 701 /* 702 * rsnd_rdai_is_clk_master() will be enabled after set_fmt, 703 * and, pcm_new will be called after it. 704 * This function reuse pcm_new at this point. 705 */ 706 rsnd_ssi_parent_attach(mod, io); 707 708 return 0; 709 } 710 711 static int rsnd_ssi_common_probe(struct rsnd_mod *mod, 712 struct rsnd_dai_stream *io, 713 struct rsnd_priv *priv) 714 { 715 struct device *dev = rsnd_priv_to_dev(priv); 716 struct rsnd_ssi *ssi = rsnd_mod_to_ssi(mod); 717 int ret; 718 719 /* 720 * SSIP/SSIU/IRQ are not needed on 721 * SSI Multi slaves 722 */ 723 if (rsnd_ssi_is_multi_slave(mod, io)) 724 return 0; 725 726 /* 727 * It can't judge ssi parent at this point 728 * see rsnd_ssi_pcm_new() 729 */ 730 731 ret = rsnd_ssiu_attach(io, mod); 732 if (ret < 0) 733 return ret; 734 735 /* 736 * SSI might be called again as PIO fallback 737 * It is easy to manual handling for IRQ request/free 738 * 739 * OTOH, this function might be called many times if platform is 740 * using MIX. It needs xxx_attach() many times on xxx_probe(). 741 * Because of it, we can't control .probe/.remove calling count by 742 * mod->status. 743 * But it don't need to call request_irq() many times. 744 * Let's control it by RSND_SSI_PROBED flag. 745 */ 746 if (!rsnd_flags_has(ssi, RSND_SSI_PROBED)) { 747 ret = request_irq(ssi->irq, 748 rsnd_ssi_interrupt, 749 IRQF_SHARED, 750 dev_name(dev), mod); 751 752 rsnd_flags_set(ssi, RSND_SSI_PROBED); 753 } 754 755 return ret; 756 } 757 758 static int rsnd_ssi_common_remove(struct rsnd_mod *mod, 759 struct rsnd_dai_stream *io, 760 struct rsnd_priv *priv) 761 { 762 struct rsnd_ssi *ssi = rsnd_mod_to_ssi(mod); 763 struct rsnd_mod *pure_ssi_mod = rsnd_io_to_mod_ssi(io); 764 765 /* Do nothing if non SSI (= SSI parent, multi SSI) mod */ 766 if (pure_ssi_mod != mod) 767 return 0; 768 769 /* PIO will request IRQ again */ 770 if (rsnd_flags_has(ssi, RSND_SSI_PROBED)) { 771 free_irq(ssi->irq, mod); 772 773 rsnd_flags_del(ssi, RSND_SSI_PROBED); 774 } 775 776 return 0; 777 } 778 779 /* 780 * SSI PIO functions 781 */ 782 static bool rsnd_ssi_pio_interrupt(struct rsnd_mod *mod, 783 struct rsnd_dai_stream *io) 784 { 785 struct snd_pcm_runtime *runtime = rsnd_io_to_runtime(io); 786 struct rsnd_ssi *ssi = rsnd_mod_to_ssi(mod); 787 u32 *buf = (u32 *)(runtime->dma_area + ssi->byte_pos); 788 int shift = 0; 789 int byte_pos; 790 bool elapsed = false; 791 792 if (snd_pcm_format_width(runtime->format) == 24) 793 shift = 8; 794 795 /* 796 * 8/16/32 data can be assesse to TDR/RDR register 797 * directly as 32bit data 798 * see rsnd_ssi_init() 799 */ 800 if (rsnd_io_is_play(io)) 801 rsnd_mod_write(mod, SSITDR, (*buf) << shift); 802 else 803 *buf = (rsnd_mod_read(mod, SSIRDR) >> shift); 804 805 byte_pos = ssi->byte_pos + sizeof(*buf); 806 807 if (byte_pos >= ssi->next_period_byte) { 808 int period_pos = byte_pos / ssi->byte_per_period; 809 810 if (period_pos >= runtime->periods) { 811 byte_pos = 0; 812 period_pos = 0; 813 } 814 815 ssi->next_period_byte = (period_pos + 1) * ssi->byte_per_period; 816 817 elapsed = true; 818 } 819 820 WRITE_ONCE(ssi->byte_pos, byte_pos); 821 822 return elapsed; 823 } 824 825 static int rsnd_ssi_pio_init(struct rsnd_mod *mod, 826 struct rsnd_dai_stream *io, 827 struct rsnd_priv *priv) 828 { 829 struct snd_pcm_runtime *runtime = rsnd_io_to_runtime(io); 830 struct rsnd_ssi *ssi = rsnd_mod_to_ssi(mod); 831 832 if (!rsnd_ssi_is_parent(mod, io)) { 833 ssi->byte_pos = 0; 834 ssi->byte_per_period = runtime->period_size * 835 runtime->channels * 836 samples_to_bytes(runtime, 1); 837 ssi->next_period_byte = ssi->byte_per_period; 838 } 839 840 return rsnd_ssi_init(mod, io, priv); 841 } 842 843 static int rsnd_ssi_pio_pointer(struct rsnd_mod *mod, 844 struct rsnd_dai_stream *io, 845 snd_pcm_uframes_t *pointer) 846 { 847 struct rsnd_ssi *ssi = rsnd_mod_to_ssi(mod); 848 struct snd_pcm_runtime *runtime = rsnd_io_to_runtime(io); 849 850 *pointer = bytes_to_frames(runtime, READ_ONCE(ssi->byte_pos)); 851 852 return 0; 853 } 854 855 static struct rsnd_mod_ops rsnd_ssi_pio_ops = { 856 .name = SSI_NAME, 857 .probe = rsnd_ssi_common_probe, 858 .remove = rsnd_ssi_common_remove, 859 .init = rsnd_ssi_pio_init, 860 .quit = rsnd_ssi_quit, 861 .start = rsnd_ssi_start, 862 .stop = rsnd_ssi_stop, 863 .irq = rsnd_ssi_irq, 864 .pointer = rsnd_ssi_pio_pointer, 865 .pcm_new = rsnd_ssi_pcm_new, 866 .hw_params = rsnd_ssi_hw_params, 867 }; 868 869 static int rsnd_ssi_dma_probe(struct rsnd_mod *mod, 870 struct rsnd_dai_stream *io, 871 struct rsnd_priv *priv) 872 { 873 struct rsnd_ssi *ssi = rsnd_mod_to_ssi(mod); 874 int ret; 875 876 /* 877 * SSIP/SSIU/IRQ/DMA are not needed on 878 * SSI Multi slaves 879 */ 880 if (rsnd_ssi_is_multi_slave(mod, io)) 881 return 0; 882 883 ret = rsnd_ssi_common_probe(mod, io, priv); 884 if (ret) 885 return ret; 886 887 /* SSI probe might be called many times in MUX multi path */ 888 ret = rsnd_dma_attach(io, mod, &ssi->dma); 889 890 return ret; 891 } 892 893 static int rsnd_ssi_fallback(struct rsnd_mod *mod, 894 struct rsnd_dai_stream *io, 895 struct rsnd_priv *priv) 896 { 897 struct device *dev = rsnd_priv_to_dev(priv); 898 899 /* 900 * fallback to PIO 901 * 902 * SSI .probe might be called again. 903 * see 904 * rsnd_rdai_continuance_probe() 905 */ 906 mod->ops = &rsnd_ssi_pio_ops; 907 908 dev_info(dev, "%s[%d] fallback to PIO mode\n", 909 rsnd_mod_name(mod), rsnd_mod_id(mod)); 910 911 return 0; 912 } 913 914 static struct dma_chan *rsnd_ssi_dma_req(struct rsnd_dai_stream *io, 915 struct rsnd_mod *mod) 916 { 917 struct rsnd_priv *priv = rsnd_mod_to_priv(mod); 918 int is_play = rsnd_io_is_play(io); 919 char *name; 920 921 if (rsnd_ssi_use_busif(io)) 922 name = is_play ? "rxu" : "txu"; 923 else 924 name = is_play ? "rx" : "tx"; 925 926 return rsnd_dma_request_channel(rsnd_ssi_of_node(priv), 927 mod, name); 928 } 929 930 static struct rsnd_mod_ops rsnd_ssi_dma_ops = { 931 .name = SSI_NAME, 932 .dma_req = rsnd_ssi_dma_req, 933 .probe = rsnd_ssi_dma_probe, 934 .remove = rsnd_ssi_common_remove, 935 .init = rsnd_ssi_init, 936 .quit = rsnd_ssi_quit, 937 .start = rsnd_ssi_start, 938 .stop = rsnd_ssi_stop, 939 .irq = rsnd_ssi_irq, 940 .pcm_new = rsnd_ssi_pcm_new, 941 .fallback = rsnd_ssi_fallback, 942 .hw_params = rsnd_ssi_hw_params, 943 }; 944 945 int rsnd_ssi_is_dma_mode(struct rsnd_mod *mod) 946 { 947 return mod->ops == &rsnd_ssi_dma_ops; 948 } 949 950 951 /* 952 * ssi mod function 953 */ 954 static void rsnd_ssi_connect(struct rsnd_mod *mod, 955 struct rsnd_dai_stream *io) 956 { 957 struct rsnd_dai *rdai = rsnd_io_to_rdai(io); 958 enum rsnd_mod_type types[] = { 959 RSND_MOD_SSI, 960 RSND_MOD_SSIM1, 961 RSND_MOD_SSIM2, 962 RSND_MOD_SSIM3, 963 }; 964 enum rsnd_mod_type type; 965 int i; 966 967 /* try SSI -> SSIM1 -> SSIM2 -> SSIM3 */ 968 for (i = 0; i < ARRAY_SIZE(types); i++) { 969 type = types[i]; 970 if (!rsnd_io_to_mod(io, type)) { 971 rsnd_dai_connect(mod, io, type); 972 rsnd_rdai_channels_set(rdai, (i + 1) * 2); 973 rsnd_rdai_ssi_lane_set(rdai, (i + 1)); 974 return; 975 } 976 } 977 } 978 979 void rsnd_parse_connect_ssi(struct rsnd_dai *rdai, 980 struct device_node *playback, 981 struct device_node *capture) 982 { 983 struct rsnd_priv *priv = rsnd_rdai_to_priv(rdai); 984 struct device_node *node; 985 struct device_node *np; 986 struct rsnd_mod *mod; 987 int i; 988 989 node = rsnd_ssi_of_node(priv); 990 if (!node) 991 return; 992 993 i = 0; 994 for_each_child_of_node(node, np) { 995 mod = rsnd_ssi_mod_get(priv, i); 996 if (np == playback) 997 rsnd_ssi_connect(mod, &rdai->playback); 998 if (np == capture) 999 rsnd_ssi_connect(mod, &rdai->capture); 1000 i++; 1001 } 1002 1003 of_node_put(node); 1004 } 1005 1006 static void __rsnd_ssi_parse_hdmi_connection(struct rsnd_priv *priv, 1007 struct rsnd_dai_stream *io, 1008 struct device_node *remote_ep) 1009 { 1010 struct device *dev = rsnd_priv_to_dev(priv); 1011 struct rsnd_mod *mod = rsnd_io_to_mod_ssi(io); 1012 struct rsnd_ssi *ssi; 1013 struct device_node *remote_node = of_graph_get_port_parent(remote_ep); 1014 1015 /* support Gen3 only */ 1016 if (!rsnd_is_gen3(priv)) 1017 return; 1018 1019 if (!mod) 1020 return; 1021 1022 ssi = rsnd_mod_to_ssi(mod); 1023 1024 /* HDMI0 */ 1025 if (strstr(remote_node->full_name, "hdmi@fead0000")) { 1026 rsnd_flags_set(ssi, RSND_SSI_HDMI0); 1027 dev_dbg(dev, "%s[%d] connected to HDMI0\n", 1028 rsnd_mod_name(mod), rsnd_mod_id(mod)); 1029 } 1030 1031 /* HDMI1 */ 1032 if (strstr(remote_node->full_name, "hdmi@feae0000")) { 1033 rsnd_flags_set(ssi, RSND_SSI_HDMI1); 1034 dev_dbg(dev, "%s[%d] connected to HDMI1\n", 1035 rsnd_mod_name(mod), rsnd_mod_id(mod)); 1036 } 1037 } 1038 1039 void rsnd_ssi_parse_hdmi_connection(struct rsnd_priv *priv, 1040 struct device_node *endpoint, 1041 int dai_i) 1042 { 1043 struct rsnd_dai *rdai = rsnd_rdai_get(priv, dai_i); 1044 struct device_node *remote_ep; 1045 1046 remote_ep = of_graph_get_remote_endpoint(endpoint); 1047 if (!remote_ep) 1048 return; 1049 1050 __rsnd_ssi_parse_hdmi_connection(priv, &rdai->playback, remote_ep); 1051 __rsnd_ssi_parse_hdmi_connection(priv, &rdai->capture, remote_ep); 1052 } 1053 1054 struct rsnd_mod *rsnd_ssi_mod_get(struct rsnd_priv *priv, int id) 1055 { 1056 if (WARN_ON(id < 0 || id >= rsnd_ssi_nr(priv))) 1057 id = 0; 1058 1059 return rsnd_mod_get(rsnd_ssi_get(priv, id)); 1060 } 1061 1062 int __rsnd_ssi_is_pin_sharing(struct rsnd_mod *mod) 1063 { 1064 if (!mod) 1065 return 0; 1066 1067 return !!(rsnd_flags_has(rsnd_mod_to_ssi(mod), RSND_SSI_CLK_PIN_SHARE)); 1068 } 1069 1070 static u32 *rsnd_ssi_get_status(struct rsnd_dai_stream *io, 1071 struct rsnd_mod *mod, 1072 enum rsnd_mod_type type) 1073 { 1074 /* 1075 * SSIP (= SSI parent) needs to be special, otherwise, 1076 * 2nd SSI might doesn't start. see also rsnd_mod_call() 1077 * 1078 * We can't include parent SSI status on SSI, because we don't know 1079 * how many SSI requests parent SSI. Thus, it is localed on "io" now. 1080 * ex) trouble case 1081 * Playback: SSI0 1082 * Capture : SSI1 (needs SSI0) 1083 * 1084 * 1) start Capture -> SSI0/SSI1 are started. 1085 * 2) start Playback -> SSI0 doesn't work, because it is already 1086 * marked as "started" on 1) 1087 * 1088 * OTOH, using each mod's status is good for MUX case. 1089 * It doesn't need to start in 2nd start 1090 * ex) 1091 * IO-0: SRC0 -> CTU1 -+-> MUX -> DVC -> SSIU -> SSI0 1092 * | 1093 * IO-1: SRC1 -> CTU2 -+ 1094 * 1095 * 1) start IO-0 -> start SSI0 1096 * 2) start IO-1 -> SSI0 doesn't need to start, because it is 1097 * already started on 1) 1098 */ 1099 if (type == RSND_MOD_SSIP) 1100 return &io->parent_ssi_status; 1101 1102 return rsnd_mod_get_status(io, mod, type); 1103 } 1104 1105 int rsnd_ssi_probe(struct rsnd_priv *priv) 1106 { 1107 struct device_node *node; 1108 struct device_node *np; 1109 struct device *dev = rsnd_priv_to_dev(priv); 1110 struct rsnd_mod_ops *ops; 1111 struct clk *clk; 1112 struct rsnd_ssi *ssi; 1113 char name[RSND_SSI_NAME_SIZE]; 1114 int i, nr, ret; 1115 1116 node = rsnd_ssi_of_node(priv); 1117 if (!node) 1118 return -EINVAL; 1119 1120 nr = of_get_child_count(node); 1121 if (!nr) { 1122 ret = -EINVAL; 1123 goto rsnd_ssi_probe_done; 1124 } 1125 1126 ssi = devm_kcalloc(dev, nr, sizeof(*ssi), GFP_KERNEL); 1127 if (!ssi) { 1128 ret = -ENOMEM; 1129 goto rsnd_ssi_probe_done; 1130 } 1131 1132 priv->ssi = ssi; 1133 priv->ssi_nr = nr; 1134 1135 i = 0; 1136 for_each_child_of_node(node, np) { 1137 if (!of_device_is_available(np)) 1138 goto skip; 1139 1140 ssi = rsnd_ssi_get(priv, i); 1141 1142 snprintf(name, RSND_SSI_NAME_SIZE, "%s.%d", 1143 SSI_NAME, i); 1144 1145 clk = devm_clk_get(dev, name); 1146 if (IS_ERR(clk)) { 1147 ret = PTR_ERR(clk); 1148 of_node_put(np); 1149 goto rsnd_ssi_probe_done; 1150 } 1151 1152 if (of_get_property(np, "shared-pin", NULL)) 1153 rsnd_flags_set(ssi, RSND_SSI_CLK_PIN_SHARE); 1154 1155 if (of_get_property(np, "no-busif", NULL)) 1156 rsnd_flags_set(ssi, RSND_SSI_NO_BUSIF); 1157 1158 ssi->irq = irq_of_parse_and_map(np, 0); 1159 if (!ssi->irq) { 1160 ret = -EINVAL; 1161 of_node_put(np); 1162 goto rsnd_ssi_probe_done; 1163 } 1164 1165 if (of_property_read_bool(np, "pio-transfer")) 1166 ops = &rsnd_ssi_pio_ops; 1167 else 1168 ops = &rsnd_ssi_dma_ops; 1169 1170 ret = rsnd_mod_init(priv, rsnd_mod_get(ssi), ops, clk, 1171 rsnd_ssi_get_status, RSND_MOD_SSI, i); 1172 if (ret) { 1173 of_node_put(np); 1174 goto rsnd_ssi_probe_done; 1175 } 1176 skip: 1177 i++; 1178 } 1179 1180 ret = 0; 1181 1182 rsnd_ssi_probe_done: 1183 of_node_put(node); 1184 1185 return ret; 1186 } 1187 1188 void rsnd_ssi_remove(struct rsnd_priv *priv) 1189 { 1190 struct rsnd_ssi *ssi; 1191 int i; 1192 1193 for_each_rsnd_ssi(ssi, priv, i) { 1194 rsnd_mod_quit(rsnd_mod_get(ssi)); 1195 } 1196 } 1197