1 /* 2 * Renesas R-Car SSIU/SSI support 3 * 4 * Copyright (C) 2013 Renesas Solutions Corp. 5 * Kuninori Morimoto <kuninori.morimoto.gx@renesas.com> 6 * 7 * Based on fsi.c 8 * Kuninori Morimoto <morimoto.kuninori@renesas.com> 9 * 10 * This program is free software; you can redistribute it and/or modify 11 * it under the terms of the GNU General Public License version 2 as 12 * published by the Free Software Foundation. 13 */ 14 #include <sound/simple_card_utils.h> 15 #include <linux/delay.h> 16 #include "rsnd.h" 17 #define RSND_SSI_NAME_SIZE 16 18 19 /* 20 * SSICR 21 */ 22 #define FORCE (1 << 31) /* Fixed */ 23 #define DMEN (1 << 28) /* DMA Enable */ 24 #define UIEN (1 << 27) /* Underflow Interrupt Enable */ 25 #define OIEN (1 << 26) /* Overflow Interrupt Enable */ 26 #define IIEN (1 << 25) /* Idle Mode Interrupt Enable */ 27 #define DIEN (1 << 24) /* Data Interrupt Enable */ 28 #define CHNL_4 (1 << 22) /* Channels */ 29 #define CHNL_6 (2 << 22) /* Channels */ 30 #define CHNL_8 (3 << 22) /* Channels */ 31 #define DWL_8 (0 << 19) /* Data Word Length */ 32 #define DWL_16 (1 << 19) /* Data Word Length */ 33 #define DWL_18 (2 << 19) /* Data Word Length */ 34 #define DWL_20 (3 << 19) /* Data Word Length */ 35 #define DWL_22 (4 << 19) /* Data Word Length */ 36 #define DWL_24 (5 << 19) /* Data Word Length */ 37 #define DWL_32 (6 << 19) /* Data Word Length */ 38 39 #define SWL_32 (3 << 16) /* R/W System Word Length */ 40 #define SCKD (1 << 15) /* Serial Bit Clock Direction */ 41 #define SWSD (1 << 14) /* Serial WS Direction */ 42 #define SCKP (1 << 13) /* Serial Bit Clock Polarity */ 43 #define SWSP (1 << 12) /* Serial WS Polarity */ 44 #define SDTA (1 << 10) /* Serial Data Alignment */ 45 #define PDTA (1 << 9) /* Parallel Data Alignment */ 46 #define DEL (1 << 8) /* Serial Data Delay */ 47 #define CKDV(v) (v << 4) /* Serial Clock Division Ratio */ 48 #define TRMD (1 << 1) /* Transmit/Receive Mode Select */ 49 #define EN (1 << 0) /* SSI Module Enable */ 50 51 /* 52 * SSISR 53 */ 54 #define UIRQ (1 << 27) /* Underflow Error Interrupt Status */ 55 #define OIRQ (1 << 26) /* Overflow Error Interrupt Status */ 56 #define IIRQ (1 << 25) /* Idle Mode Interrupt Status */ 57 #define DIRQ (1 << 24) /* Data Interrupt Status Flag */ 58 59 /* 60 * SSIWSR 61 */ 62 #define CONT (1 << 8) /* WS Continue Function */ 63 #define WS_MODE (1 << 0) /* WS Mode */ 64 65 #define SSI_NAME "ssi" 66 67 struct rsnd_ssi { 68 struct rsnd_mod mod; 69 struct rsnd_mod *dma; 70 71 u32 flags; 72 u32 cr_own; 73 u32 cr_clk; 74 u32 cr_mode; 75 u32 cr_en; 76 u32 wsr; 77 int chan; 78 int rate; 79 int irq; 80 unsigned int usrcnt; 81 82 /* for PIO */ 83 int byte_pos; 84 int byte_per_period; 85 int next_period_byte; 86 }; 87 88 /* flags */ 89 #define RSND_SSI_CLK_PIN_SHARE (1 << 0) 90 #define RSND_SSI_NO_BUSIF (1 << 1) /* SSI+DMA without BUSIF */ 91 #define RSND_SSI_HDMI0 (1 << 2) /* for HDMI0 */ 92 #define RSND_SSI_HDMI1 (1 << 3) /* for HDMI1 */ 93 #define RSND_SSI_PROBED (1 << 4) 94 95 #define for_each_rsnd_ssi(pos, priv, i) \ 96 for (i = 0; \ 97 (i < rsnd_ssi_nr(priv)) && \ 98 ((pos) = ((struct rsnd_ssi *)(priv)->ssi + i)); \ 99 i++) 100 101 #define rsnd_ssi_get(priv, id) ((struct rsnd_ssi *)(priv->ssi) + id) 102 #define rsnd_ssi_nr(priv) ((priv)->ssi_nr) 103 #define rsnd_mod_to_ssi(_mod) container_of((_mod), struct rsnd_ssi, mod) 104 #define rsnd_ssi_is_parent(ssi, io) ((ssi) == rsnd_io_to_mod_ssip(io)) 105 #define rsnd_ssi_is_multi_slave(mod, io) \ 106 (rsnd_ssi_multi_slaves(io) & (1 << rsnd_mod_id(mod))) 107 #define rsnd_ssi_is_run_mods(mod, io) \ 108 (rsnd_ssi_run_mods(io) & (1 << rsnd_mod_id(mod))) 109 #define rsnd_ssi_can_output_clk(mod) (!__rsnd_ssi_is_pin_sharing(mod)) 110 111 int rsnd_ssi_hdmi_port(struct rsnd_dai_stream *io) 112 { 113 struct rsnd_mod *mod = rsnd_io_to_mod_ssi(io); 114 struct rsnd_ssi *ssi = rsnd_mod_to_ssi(mod); 115 116 if (rsnd_flags_has(ssi, RSND_SSI_HDMI0)) 117 return RSND_SSI_HDMI_PORT0; 118 119 if (rsnd_flags_has(ssi, RSND_SSI_HDMI1)) 120 return RSND_SSI_HDMI_PORT1; 121 122 return 0; 123 } 124 125 int rsnd_ssi_use_busif(struct rsnd_dai_stream *io) 126 { 127 struct rsnd_mod *mod = rsnd_io_to_mod_ssi(io); 128 struct rsnd_ssi *ssi = rsnd_mod_to_ssi(mod); 129 int use_busif = 0; 130 131 if (!rsnd_ssi_is_dma_mode(mod)) 132 return 0; 133 134 if (!(rsnd_flags_has(ssi, RSND_SSI_NO_BUSIF))) 135 use_busif = 1; 136 if (rsnd_io_to_mod_src(io)) 137 use_busif = 1; 138 139 return use_busif; 140 } 141 142 static void rsnd_ssi_status_clear(struct rsnd_mod *mod) 143 { 144 rsnd_mod_write(mod, SSISR, 0); 145 } 146 147 static u32 rsnd_ssi_status_get(struct rsnd_mod *mod) 148 { 149 return rsnd_mod_read(mod, SSISR); 150 } 151 152 static void rsnd_ssi_status_check(struct rsnd_mod *mod, 153 u32 bit) 154 { 155 struct rsnd_priv *priv = rsnd_mod_to_priv(mod); 156 struct device *dev = rsnd_priv_to_dev(priv); 157 u32 status; 158 int i; 159 160 for (i = 0; i < 1024; i++) { 161 status = rsnd_ssi_status_get(mod); 162 if (status & bit) 163 return; 164 165 udelay(50); 166 } 167 168 dev_warn(dev, "%s[%d] status check failed\n", 169 rsnd_mod_name(mod), rsnd_mod_id(mod)); 170 } 171 172 static u32 rsnd_ssi_multi_slaves(struct rsnd_dai_stream *io) 173 { 174 struct rsnd_mod *mod; 175 enum rsnd_mod_type types[] = { 176 RSND_MOD_SSIM1, 177 RSND_MOD_SSIM2, 178 RSND_MOD_SSIM3, 179 }; 180 int i, mask; 181 182 mask = 0; 183 for (i = 0; i < ARRAY_SIZE(types); i++) { 184 mod = rsnd_io_to_mod(io, types[i]); 185 if (!mod) 186 continue; 187 188 mask |= 1 << rsnd_mod_id(mod); 189 } 190 191 return mask; 192 } 193 194 static u32 rsnd_ssi_run_mods(struct rsnd_dai_stream *io) 195 { 196 struct rsnd_mod *ssi_mod = rsnd_io_to_mod_ssi(io); 197 struct rsnd_mod *ssi_parent_mod = rsnd_io_to_mod_ssip(io); 198 u32 mods; 199 200 mods = rsnd_ssi_multi_slaves_runtime(io) | 201 1 << rsnd_mod_id(ssi_mod); 202 203 if (ssi_parent_mod) 204 mods |= 1 << rsnd_mod_id(ssi_parent_mod); 205 206 return mods; 207 } 208 209 u32 rsnd_ssi_multi_slaves_runtime(struct rsnd_dai_stream *io) 210 { 211 if (rsnd_runtime_is_ssi_multi(io)) 212 return rsnd_ssi_multi_slaves(io); 213 214 return 0; 215 } 216 217 unsigned int rsnd_ssi_clk_query(struct rsnd_priv *priv, 218 int param1, int param2, int *idx) 219 { 220 int ssi_clk_mul_table[] = { 221 1, 2, 4, 8, 16, 6, 12, 222 }; 223 int j, ret; 224 unsigned int main_rate; 225 226 for (j = 0; j < ARRAY_SIZE(ssi_clk_mul_table); j++) { 227 228 /* 229 * It will set SSIWSR.CONT here, but SSICR.CKDV = 000 230 * with it is not allowed. (SSIWSR.WS_MODE with 231 * SSICR.CKDV = 000 is not allowed either). 232 * Skip it. See SSICR.CKDV 233 */ 234 if (j == 0) 235 continue; 236 237 /* 238 * this driver is assuming that 239 * system word is 32bit x chan 240 * see rsnd_ssi_init() 241 */ 242 main_rate = 32 * param1 * param2 * ssi_clk_mul_table[j]; 243 244 ret = rsnd_adg_clk_query(priv, main_rate); 245 if (ret < 0) 246 continue; 247 248 if (idx) 249 *idx = j; 250 251 return main_rate; 252 } 253 254 return 0; 255 } 256 257 static int rsnd_ssi_master_clk_start(struct rsnd_mod *mod, 258 struct rsnd_dai_stream *io) 259 { 260 struct rsnd_priv *priv = rsnd_io_to_priv(io); 261 struct device *dev = rsnd_priv_to_dev(priv); 262 struct rsnd_dai *rdai = rsnd_io_to_rdai(io); 263 struct rsnd_ssi *ssi = rsnd_mod_to_ssi(mod); 264 int chan = rsnd_runtime_channel_for_ssi(io); 265 int idx, ret; 266 unsigned int main_rate; 267 unsigned int rate = rsnd_io_is_play(io) ? 268 rsnd_src_get_out_rate(priv, io) : 269 rsnd_src_get_in_rate(priv, io); 270 271 if (!rsnd_rdai_is_clk_master(rdai)) 272 return 0; 273 274 if (!rsnd_ssi_can_output_clk(mod)) 275 return 0; 276 277 if (rsnd_ssi_is_multi_slave(mod, io)) 278 return 0; 279 280 if (ssi->usrcnt > 1) { 281 if (ssi->rate != rate) { 282 dev_err(dev, "SSI parent/child should use same rate\n"); 283 return -EINVAL; 284 } 285 286 return 0; 287 } 288 289 main_rate = rsnd_ssi_clk_query(priv, rate, chan, &idx); 290 if (!main_rate) { 291 dev_err(dev, "unsupported clock rate\n"); 292 return -EIO; 293 } 294 295 ret = rsnd_adg_ssi_clk_try_start(mod, main_rate); 296 if (ret < 0) 297 return ret; 298 299 /* 300 * SSI clock will be output contiguously 301 * by below settings. 302 * This means, rsnd_ssi_master_clk_start() 303 * and rsnd_ssi_register_setup() are necessary 304 * for SSI parent 305 * 306 * SSICR : FORCE, SCKD, SWSD 307 * SSIWSR : CONT 308 */ 309 ssi->cr_clk = FORCE | SWL_32 | SCKD | SWSD | CKDV(idx); 310 ssi->wsr = CONT; 311 ssi->rate = rate; 312 313 dev_dbg(dev, "%s[%d] outputs %u Hz\n", 314 rsnd_mod_name(mod), 315 rsnd_mod_id(mod), rate); 316 317 return 0; 318 } 319 320 static void rsnd_ssi_master_clk_stop(struct rsnd_mod *mod, 321 struct rsnd_dai_stream *io) 322 { 323 struct rsnd_dai *rdai = rsnd_io_to_rdai(io); 324 struct rsnd_ssi *ssi = rsnd_mod_to_ssi(mod); 325 326 if (!rsnd_rdai_is_clk_master(rdai)) 327 return; 328 329 if (!rsnd_ssi_can_output_clk(mod)) 330 return; 331 332 if (ssi->usrcnt > 1) 333 return; 334 335 ssi->cr_clk = 0; 336 ssi->rate = 0; 337 338 rsnd_adg_ssi_clk_stop(mod); 339 } 340 341 static void rsnd_ssi_config_init(struct rsnd_mod *mod, 342 struct rsnd_dai_stream *io) 343 { 344 struct rsnd_dai *rdai = rsnd_io_to_rdai(io); 345 struct snd_pcm_runtime *runtime = rsnd_io_to_runtime(io); 346 struct rsnd_ssi *ssi = rsnd_mod_to_ssi(mod); 347 u32 cr_own; 348 u32 cr_mode; 349 u32 wsr; 350 int is_tdm; 351 352 if (rsnd_ssi_is_parent(mod, io)) 353 return; 354 355 is_tdm = rsnd_runtime_is_ssi_tdm(io); 356 357 /* 358 * always use 32bit system word. 359 * see also rsnd_ssi_master_clk_enable() 360 */ 361 cr_own = FORCE | SWL_32; 362 363 if (rdai->bit_clk_inv) 364 cr_own |= SCKP; 365 if (rdai->frm_clk_inv ^ is_tdm) 366 cr_own |= SWSP; 367 if (rdai->data_alignment) 368 cr_own |= SDTA; 369 if (rdai->sys_delay) 370 cr_own |= DEL; 371 if (rsnd_io_is_play(io)) 372 cr_own |= TRMD; 373 374 switch (snd_pcm_format_width(runtime->format)) { 375 case 16: 376 cr_own |= DWL_16; 377 break; 378 case 24: 379 cr_own |= DWL_24; 380 break; 381 } 382 383 if (rsnd_ssi_is_dma_mode(mod)) { 384 cr_mode = UIEN | OIEN | /* over/under run */ 385 DMEN; /* DMA : enable DMA */ 386 } else { 387 cr_mode = DIEN; /* PIO : enable Data interrupt */ 388 } 389 390 /* 391 * TDM Extend Mode 392 * see 393 * rsnd_ssiu_init_gen2() 394 */ 395 wsr = ssi->wsr; 396 if (is_tdm) { 397 wsr |= WS_MODE; 398 cr_own |= CHNL_8; 399 } 400 401 ssi->cr_own = cr_own; 402 ssi->cr_mode = cr_mode; 403 ssi->wsr = wsr; 404 } 405 406 static void rsnd_ssi_register_setup(struct rsnd_mod *mod) 407 { 408 struct rsnd_ssi *ssi = rsnd_mod_to_ssi(mod); 409 410 rsnd_mod_write(mod, SSIWSR, ssi->wsr); 411 rsnd_mod_write(mod, SSICR, ssi->cr_own | 412 ssi->cr_clk | 413 ssi->cr_mode | 414 ssi->cr_en); 415 } 416 417 /* 418 * SSI mod common functions 419 */ 420 static int rsnd_ssi_init(struct rsnd_mod *mod, 421 struct rsnd_dai_stream *io, 422 struct rsnd_priv *priv) 423 { 424 struct rsnd_ssi *ssi = rsnd_mod_to_ssi(mod); 425 int ret; 426 427 if (!rsnd_ssi_is_run_mods(mod, io)) 428 return 0; 429 430 ssi->usrcnt++; 431 432 rsnd_mod_power_on(mod); 433 434 ret = rsnd_ssi_master_clk_start(mod, io); 435 if (ret < 0) 436 return ret; 437 438 rsnd_ssi_config_init(mod, io); 439 440 rsnd_ssi_register_setup(mod); 441 442 /* clear error status */ 443 rsnd_ssi_status_clear(mod); 444 445 return 0; 446 } 447 448 static int rsnd_ssi_quit(struct rsnd_mod *mod, 449 struct rsnd_dai_stream *io, 450 struct rsnd_priv *priv) 451 { 452 struct rsnd_ssi *ssi = rsnd_mod_to_ssi(mod); 453 struct device *dev = rsnd_priv_to_dev(priv); 454 455 if (!rsnd_ssi_is_run_mods(mod, io)) 456 return 0; 457 458 if (!ssi->usrcnt) { 459 dev_err(dev, "%s[%d] usrcnt error\n", 460 rsnd_mod_name(mod), rsnd_mod_id(mod)); 461 return -EIO; 462 } 463 464 if (!rsnd_ssi_is_parent(mod, io)) 465 ssi->cr_own = 0; 466 467 rsnd_ssi_master_clk_stop(mod, io); 468 469 rsnd_mod_power_off(mod); 470 471 ssi->usrcnt--; 472 473 return 0; 474 } 475 476 static int rsnd_ssi_hw_params(struct rsnd_mod *mod, 477 struct rsnd_dai_stream *io, 478 struct snd_pcm_substream *substream, 479 struct snd_pcm_hw_params *params) 480 { 481 struct rsnd_ssi *ssi = rsnd_mod_to_ssi(mod); 482 int chan = params_channels(params); 483 484 /* 485 * snd_pcm_ops::hw_params will be called *before* 486 * snd_soc_dai_ops::trigger. Thus, ssi->usrcnt is 0 487 * in 1st call. 488 */ 489 if (ssi->usrcnt) { 490 /* 491 * Already working. 492 * It will happen if SSI has parent/child connection. 493 * it is error if child <-> parent SSI uses 494 * different channels. 495 */ 496 if (ssi->chan != chan) 497 return -EIO; 498 } 499 500 ssi->chan = chan; 501 502 return 0; 503 } 504 505 static int rsnd_ssi_start(struct rsnd_mod *mod, 506 struct rsnd_dai_stream *io, 507 struct rsnd_priv *priv) 508 { 509 struct rsnd_ssi *ssi = rsnd_mod_to_ssi(mod); 510 511 if (!rsnd_ssi_is_run_mods(mod, io)) 512 return 0; 513 514 /* 515 * EN will be set via SSIU :: SSI_CONTROL 516 * if Multi channel mode 517 */ 518 if (rsnd_ssi_multi_slaves_runtime(io)) 519 return 0; 520 521 /* 522 * EN is for data output. 523 * SSI parent EN is not needed. 524 */ 525 if (rsnd_ssi_is_parent(mod, io)) 526 return 0; 527 528 ssi->cr_en = EN; 529 530 rsnd_mod_write(mod, SSICR, ssi->cr_own | 531 ssi->cr_clk | 532 ssi->cr_mode | 533 ssi->cr_en); 534 535 return 0; 536 } 537 538 static int rsnd_ssi_stop(struct rsnd_mod *mod, 539 struct rsnd_dai_stream *io, 540 struct rsnd_priv *priv) 541 { 542 struct rsnd_ssi *ssi = rsnd_mod_to_ssi(mod); 543 u32 cr; 544 545 if (!rsnd_ssi_is_run_mods(mod, io)) 546 return 0; 547 548 if (rsnd_ssi_is_parent(mod, io)) 549 return 0; 550 551 cr = ssi->cr_own | 552 ssi->cr_clk; 553 554 /* 555 * disable all IRQ, 556 * Playback: Wait all data was sent 557 * Capture: It might not receave data. Do nothing 558 */ 559 if (rsnd_io_is_play(io)) { 560 rsnd_mod_write(mod, SSICR, cr | EN); 561 rsnd_ssi_status_check(mod, DIRQ); 562 } 563 564 /* 565 * disable SSI, 566 * and, wait idle state 567 */ 568 rsnd_mod_write(mod, SSICR, cr); /* disabled all */ 569 rsnd_ssi_status_check(mod, IIRQ); 570 571 ssi->cr_en = 0; 572 573 return 0; 574 } 575 576 static int rsnd_ssi_irq(struct rsnd_mod *mod, 577 struct rsnd_dai_stream *io, 578 struct rsnd_priv *priv, 579 int enable) 580 { 581 u32 val = 0; 582 583 if (rsnd_is_gen1(priv)) 584 return 0; 585 586 if (rsnd_ssi_is_parent(mod, io)) 587 return 0; 588 589 if (!rsnd_ssi_is_run_mods(mod, io)) 590 return 0; 591 592 if (enable) 593 val = rsnd_ssi_is_dma_mode(mod) ? 0x0e000000 : 0x0f000000; 594 595 rsnd_mod_write(mod, SSI_INT_ENABLE, val); 596 597 return 0; 598 } 599 600 static bool rsnd_ssi_pio_interrupt(struct rsnd_mod *mod, 601 struct rsnd_dai_stream *io); 602 static void __rsnd_ssi_interrupt(struct rsnd_mod *mod, 603 struct rsnd_dai_stream *io) 604 { 605 struct rsnd_priv *priv = rsnd_mod_to_priv(mod); 606 int is_dma = rsnd_ssi_is_dma_mode(mod); 607 u32 status; 608 bool elapsed = false; 609 bool stop = false; 610 611 spin_lock(&priv->lock); 612 613 /* ignore all cases if not working */ 614 if (!rsnd_io_is_working(io)) 615 goto rsnd_ssi_interrupt_out; 616 617 status = rsnd_ssi_status_get(mod); 618 619 /* PIO only */ 620 if (!is_dma && (status & DIRQ)) 621 elapsed = rsnd_ssi_pio_interrupt(mod, io); 622 623 /* DMA only */ 624 if (is_dma && (status & (UIRQ | OIRQ))) 625 stop = true; 626 627 rsnd_ssi_status_clear(mod); 628 rsnd_ssi_interrupt_out: 629 spin_unlock(&priv->lock); 630 631 if (elapsed) 632 rsnd_dai_period_elapsed(io); 633 634 if (stop) 635 snd_pcm_stop_xrun(io->substream); 636 637 } 638 639 static irqreturn_t rsnd_ssi_interrupt(int irq, void *data) 640 { 641 struct rsnd_mod *mod = data; 642 643 rsnd_mod_interrupt(mod, __rsnd_ssi_interrupt); 644 645 return IRQ_HANDLED; 646 } 647 648 /* 649 * SSI PIO 650 */ 651 static void rsnd_ssi_parent_attach(struct rsnd_mod *mod, 652 struct rsnd_dai_stream *io) 653 { 654 struct rsnd_dai *rdai = rsnd_io_to_rdai(io); 655 struct rsnd_priv *priv = rsnd_mod_to_priv(mod); 656 657 if (!__rsnd_ssi_is_pin_sharing(mod)) 658 return; 659 660 if (!rsnd_rdai_is_clk_master(rdai)) 661 return; 662 663 switch (rsnd_mod_id(mod)) { 664 case 1: 665 case 2: 666 rsnd_dai_connect(rsnd_ssi_mod_get(priv, 0), io, RSND_MOD_SSIP); 667 break; 668 case 4: 669 rsnd_dai_connect(rsnd_ssi_mod_get(priv, 3), io, RSND_MOD_SSIP); 670 break; 671 case 8: 672 rsnd_dai_connect(rsnd_ssi_mod_get(priv, 7), io, RSND_MOD_SSIP); 673 break; 674 } 675 } 676 677 static int rsnd_ssi_pcm_new(struct rsnd_mod *mod, 678 struct rsnd_dai_stream *io, 679 struct snd_soc_pcm_runtime *rtd) 680 { 681 /* 682 * rsnd_rdai_is_clk_master() will be enabled after set_fmt, 683 * and, pcm_new will be called after it. 684 * This function reuse pcm_new at this point. 685 */ 686 rsnd_ssi_parent_attach(mod, io); 687 688 return 0; 689 } 690 691 static int rsnd_ssi_common_probe(struct rsnd_mod *mod, 692 struct rsnd_dai_stream *io, 693 struct rsnd_priv *priv) 694 { 695 struct device *dev = rsnd_priv_to_dev(priv); 696 struct rsnd_ssi *ssi = rsnd_mod_to_ssi(mod); 697 int ret; 698 699 /* 700 * SSIP/SSIU/IRQ are not needed on 701 * SSI Multi slaves 702 */ 703 if (rsnd_ssi_is_multi_slave(mod, io)) 704 return 0; 705 706 /* 707 * It can't judge ssi parent at this point 708 * see rsnd_ssi_pcm_new() 709 */ 710 711 ret = rsnd_ssiu_attach(io, mod); 712 if (ret < 0) 713 return ret; 714 715 /* 716 * SSI might be called again as PIO fallback 717 * It is easy to manual handling for IRQ request/free 718 * 719 * OTOH, this function might be called many times if platform is 720 * using MIX. It needs xxx_attach() many times on xxx_probe(). 721 * Because of it, we can't control .probe/.remove calling count by 722 * mod->status. 723 * But it don't need to call request_irq() many times. 724 * Let's control it by RSND_SSI_PROBED flag. 725 */ 726 if (!rsnd_flags_has(ssi, RSND_SSI_PROBED)) { 727 ret = request_irq(ssi->irq, 728 rsnd_ssi_interrupt, 729 IRQF_SHARED, 730 dev_name(dev), mod); 731 732 rsnd_flags_set(ssi, RSND_SSI_PROBED); 733 } 734 735 return ret; 736 } 737 738 static int rsnd_ssi_common_remove(struct rsnd_mod *mod, 739 struct rsnd_dai_stream *io, 740 struct rsnd_priv *priv) 741 { 742 struct rsnd_ssi *ssi = rsnd_mod_to_ssi(mod); 743 struct rsnd_mod *pure_ssi_mod = rsnd_io_to_mod_ssi(io); 744 745 /* Do nothing if non SSI (= SSI parent, multi SSI) mod */ 746 if (pure_ssi_mod != mod) 747 return 0; 748 749 /* PIO will request IRQ again */ 750 if (rsnd_flags_has(ssi, RSND_SSI_PROBED)) { 751 free_irq(ssi->irq, mod); 752 753 rsnd_flags_del(ssi, RSND_SSI_PROBED); 754 } 755 756 return 0; 757 } 758 759 /* 760 * SSI PIO functions 761 */ 762 static bool rsnd_ssi_pio_interrupt(struct rsnd_mod *mod, 763 struct rsnd_dai_stream *io) 764 { 765 struct snd_pcm_runtime *runtime = rsnd_io_to_runtime(io); 766 struct rsnd_ssi *ssi = rsnd_mod_to_ssi(mod); 767 u32 *buf = (u32 *)(runtime->dma_area + ssi->byte_pos); 768 int shift = 0; 769 int byte_pos; 770 bool elapsed = false; 771 772 if (snd_pcm_format_width(runtime->format) == 24) 773 shift = 8; 774 775 /* 776 * 8/16/32 data can be assesse to TDR/RDR register 777 * directly as 32bit data 778 * see rsnd_ssi_init() 779 */ 780 if (rsnd_io_is_play(io)) 781 rsnd_mod_write(mod, SSITDR, (*buf) << shift); 782 else 783 *buf = (rsnd_mod_read(mod, SSIRDR) >> shift); 784 785 byte_pos = ssi->byte_pos + sizeof(*buf); 786 787 if (byte_pos >= ssi->next_period_byte) { 788 int period_pos = byte_pos / ssi->byte_per_period; 789 790 if (period_pos >= runtime->periods) { 791 byte_pos = 0; 792 period_pos = 0; 793 } 794 795 ssi->next_period_byte = (period_pos + 1) * ssi->byte_per_period; 796 797 elapsed = true; 798 } 799 800 WRITE_ONCE(ssi->byte_pos, byte_pos); 801 802 return elapsed; 803 } 804 805 static int rsnd_ssi_pio_init(struct rsnd_mod *mod, 806 struct rsnd_dai_stream *io, 807 struct rsnd_priv *priv) 808 { 809 struct snd_pcm_runtime *runtime = rsnd_io_to_runtime(io); 810 struct rsnd_ssi *ssi = rsnd_mod_to_ssi(mod); 811 812 if (!rsnd_ssi_is_parent(mod, io)) { 813 ssi->byte_pos = 0; 814 ssi->byte_per_period = runtime->period_size * 815 runtime->channels * 816 samples_to_bytes(runtime, 1); 817 ssi->next_period_byte = ssi->byte_per_period; 818 } 819 820 return rsnd_ssi_init(mod, io, priv); 821 } 822 823 static int rsnd_ssi_pio_pointer(struct rsnd_mod *mod, 824 struct rsnd_dai_stream *io, 825 snd_pcm_uframes_t *pointer) 826 { 827 struct rsnd_ssi *ssi = rsnd_mod_to_ssi(mod); 828 struct snd_pcm_runtime *runtime = rsnd_io_to_runtime(io); 829 830 *pointer = bytes_to_frames(runtime, READ_ONCE(ssi->byte_pos)); 831 832 return 0; 833 } 834 835 static struct rsnd_mod_ops rsnd_ssi_pio_ops = { 836 .name = SSI_NAME, 837 .probe = rsnd_ssi_common_probe, 838 .remove = rsnd_ssi_common_remove, 839 .init = rsnd_ssi_pio_init, 840 .quit = rsnd_ssi_quit, 841 .start = rsnd_ssi_start, 842 .stop = rsnd_ssi_stop, 843 .irq = rsnd_ssi_irq, 844 .pointer = rsnd_ssi_pio_pointer, 845 .pcm_new = rsnd_ssi_pcm_new, 846 .hw_params = rsnd_ssi_hw_params, 847 }; 848 849 static int rsnd_ssi_dma_probe(struct rsnd_mod *mod, 850 struct rsnd_dai_stream *io, 851 struct rsnd_priv *priv) 852 { 853 struct rsnd_ssi *ssi = rsnd_mod_to_ssi(mod); 854 int ret; 855 856 /* 857 * SSIP/SSIU/IRQ/DMA are not needed on 858 * SSI Multi slaves 859 */ 860 if (rsnd_ssi_is_multi_slave(mod, io)) 861 return 0; 862 863 ret = rsnd_ssi_common_probe(mod, io, priv); 864 if (ret) 865 return ret; 866 867 /* SSI probe might be called many times in MUX multi path */ 868 ret = rsnd_dma_attach(io, mod, &ssi->dma); 869 870 return ret; 871 } 872 873 static int rsnd_ssi_fallback(struct rsnd_mod *mod, 874 struct rsnd_dai_stream *io, 875 struct rsnd_priv *priv) 876 { 877 struct device *dev = rsnd_priv_to_dev(priv); 878 879 /* 880 * fallback to PIO 881 * 882 * SSI .probe might be called again. 883 * see 884 * rsnd_rdai_continuance_probe() 885 */ 886 mod->ops = &rsnd_ssi_pio_ops; 887 888 dev_info(dev, "%s[%d] fallback to PIO mode\n", 889 rsnd_mod_name(mod), rsnd_mod_id(mod)); 890 891 return 0; 892 } 893 894 static struct dma_chan *rsnd_ssi_dma_req(struct rsnd_dai_stream *io, 895 struct rsnd_mod *mod) 896 { 897 struct rsnd_priv *priv = rsnd_mod_to_priv(mod); 898 int is_play = rsnd_io_is_play(io); 899 char *name; 900 901 if (rsnd_ssi_use_busif(io)) 902 name = is_play ? "rxu" : "txu"; 903 else 904 name = is_play ? "rx" : "tx"; 905 906 return rsnd_dma_request_channel(rsnd_ssi_of_node(priv), 907 mod, name); 908 } 909 910 static struct rsnd_mod_ops rsnd_ssi_dma_ops = { 911 .name = SSI_NAME, 912 .dma_req = rsnd_ssi_dma_req, 913 .probe = rsnd_ssi_dma_probe, 914 .remove = rsnd_ssi_common_remove, 915 .init = rsnd_ssi_init, 916 .quit = rsnd_ssi_quit, 917 .start = rsnd_ssi_start, 918 .stop = rsnd_ssi_stop, 919 .irq = rsnd_ssi_irq, 920 .pcm_new = rsnd_ssi_pcm_new, 921 .fallback = rsnd_ssi_fallback, 922 .hw_params = rsnd_ssi_hw_params, 923 }; 924 925 int rsnd_ssi_is_dma_mode(struct rsnd_mod *mod) 926 { 927 return mod->ops == &rsnd_ssi_dma_ops; 928 } 929 930 931 /* 932 * ssi mod function 933 */ 934 static void rsnd_ssi_connect(struct rsnd_mod *mod, 935 struct rsnd_dai_stream *io) 936 { 937 struct rsnd_dai *rdai = rsnd_io_to_rdai(io); 938 enum rsnd_mod_type types[] = { 939 RSND_MOD_SSI, 940 RSND_MOD_SSIM1, 941 RSND_MOD_SSIM2, 942 RSND_MOD_SSIM3, 943 }; 944 enum rsnd_mod_type type; 945 int i; 946 947 /* try SSI -> SSIM1 -> SSIM2 -> SSIM3 */ 948 for (i = 0; i < ARRAY_SIZE(types); i++) { 949 type = types[i]; 950 if (!rsnd_io_to_mod(io, type)) { 951 rsnd_dai_connect(mod, io, type); 952 rsnd_rdai_channels_set(rdai, (i + 1) * 2); 953 rsnd_rdai_ssi_lane_set(rdai, (i + 1)); 954 return; 955 } 956 } 957 } 958 959 void rsnd_parse_connect_ssi(struct rsnd_dai *rdai, 960 struct device_node *playback, 961 struct device_node *capture) 962 { 963 struct rsnd_priv *priv = rsnd_rdai_to_priv(rdai); 964 struct device_node *node; 965 struct device_node *np; 966 struct rsnd_mod *mod; 967 int i; 968 969 node = rsnd_ssi_of_node(priv); 970 if (!node) 971 return; 972 973 i = 0; 974 for_each_child_of_node(node, np) { 975 mod = rsnd_ssi_mod_get(priv, i); 976 if (np == playback) 977 rsnd_ssi_connect(mod, &rdai->playback); 978 if (np == capture) 979 rsnd_ssi_connect(mod, &rdai->capture); 980 i++; 981 } 982 983 of_node_put(node); 984 } 985 986 static void __rsnd_ssi_parse_hdmi_connection(struct rsnd_priv *priv, 987 struct rsnd_dai_stream *io, 988 struct device_node *remote_ep) 989 { 990 struct device *dev = rsnd_priv_to_dev(priv); 991 struct rsnd_mod *mod = rsnd_io_to_mod_ssi(io); 992 struct rsnd_ssi *ssi; 993 994 if (!mod) 995 return; 996 997 ssi = rsnd_mod_to_ssi(mod); 998 999 if (strstr(remote_ep->full_name, "hdmi0")) { 1000 rsnd_flags_set(ssi, RSND_SSI_HDMI0); 1001 dev_dbg(dev, "%s[%d] connected to HDMI0\n", 1002 rsnd_mod_name(mod), rsnd_mod_id(mod)); 1003 } 1004 1005 if (strstr(remote_ep->full_name, "hdmi1")) { 1006 rsnd_flags_set(ssi, RSND_SSI_HDMI1); 1007 dev_dbg(dev, "%s[%d] connected to HDMI1\n", 1008 rsnd_mod_name(mod), rsnd_mod_id(mod)); 1009 } 1010 } 1011 1012 void rsnd_ssi_parse_hdmi_connection(struct rsnd_priv *priv, 1013 struct device_node *endpoint, 1014 int dai_i) 1015 { 1016 struct rsnd_dai *rdai = rsnd_rdai_get(priv, dai_i); 1017 struct device_node *remote_ep; 1018 1019 remote_ep = of_graph_get_remote_endpoint(endpoint); 1020 if (!remote_ep) 1021 return; 1022 1023 __rsnd_ssi_parse_hdmi_connection(priv, &rdai->playback, remote_ep); 1024 __rsnd_ssi_parse_hdmi_connection(priv, &rdai->capture, remote_ep); 1025 } 1026 1027 struct rsnd_mod *rsnd_ssi_mod_get(struct rsnd_priv *priv, int id) 1028 { 1029 if (WARN_ON(id < 0 || id >= rsnd_ssi_nr(priv))) 1030 id = 0; 1031 1032 return rsnd_mod_get(rsnd_ssi_get(priv, id)); 1033 } 1034 1035 int __rsnd_ssi_is_pin_sharing(struct rsnd_mod *mod) 1036 { 1037 struct rsnd_ssi *ssi = rsnd_mod_to_ssi(mod); 1038 1039 return !!(rsnd_flags_has(ssi, RSND_SSI_CLK_PIN_SHARE)); 1040 } 1041 1042 static u32 *rsnd_ssi_get_status(struct rsnd_dai_stream *io, 1043 struct rsnd_mod *mod, 1044 enum rsnd_mod_type type) 1045 { 1046 /* 1047 * SSIP (= SSI parent) needs to be special, otherwise, 1048 * 2nd SSI might doesn't start. see also rsnd_mod_call() 1049 * 1050 * We can't include parent SSI status on SSI, because we don't know 1051 * how many SSI requests parent SSI. Thus, it is localed on "io" now. 1052 * ex) trouble case 1053 * Playback: SSI0 1054 * Capture : SSI1 (needs SSI0) 1055 * 1056 * 1) start Capture -> SSI0/SSI1 are started. 1057 * 2) start Playback -> SSI0 doesn't work, because it is already 1058 * marked as "started" on 1) 1059 * 1060 * OTOH, using each mod's status is good for MUX case. 1061 * It doesn't need to start in 2nd start 1062 * ex) 1063 * IO-0: SRC0 -> CTU1 -+-> MUX -> DVC -> SSIU -> SSI0 1064 * | 1065 * IO-1: SRC1 -> CTU2 -+ 1066 * 1067 * 1) start IO-0 -> start SSI0 1068 * 2) start IO-1 -> SSI0 doesn't need to start, because it is 1069 * already started on 1) 1070 */ 1071 if (type == RSND_MOD_SSIP) 1072 return &io->parent_ssi_status; 1073 1074 return rsnd_mod_get_status(io, mod, type); 1075 } 1076 1077 int rsnd_ssi_probe(struct rsnd_priv *priv) 1078 { 1079 struct device_node *node; 1080 struct device_node *np; 1081 struct device *dev = rsnd_priv_to_dev(priv); 1082 struct rsnd_mod_ops *ops; 1083 struct clk *clk; 1084 struct rsnd_ssi *ssi; 1085 char name[RSND_SSI_NAME_SIZE]; 1086 int i, nr, ret; 1087 1088 node = rsnd_ssi_of_node(priv); 1089 if (!node) 1090 return -EINVAL; 1091 1092 nr = of_get_child_count(node); 1093 if (!nr) { 1094 ret = -EINVAL; 1095 goto rsnd_ssi_probe_done; 1096 } 1097 1098 ssi = devm_kzalloc(dev, sizeof(*ssi) * nr, GFP_KERNEL); 1099 if (!ssi) { 1100 ret = -ENOMEM; 1101 goto rsnd_ssi_probe_done; 1102 } 1103 1104 priv->ssi = ssi; 1105 priv->ssi_nr = nr; 1106 1107 i = 0; 1108 for_each_child_of_node(node, np) { 1109 if (!of_device_is_available(np)) 1110 goto skip; 1111 1112 ssi = rsnd_ssi_get(priv, i); 1113 1114 snprintf(name, RSND_SSI_NAME_SIZE, "%s.%d", 1115 SSI_NAME, i); 1116 1117 clk = devm_clk_get(dev, name); 1118 if (IS_ERR(clk)) { 1119 ret = PTR_ERR(clk); 1120 of_node_put(np); 1121 goto rsnd_ssi_probe_done; 1122 } 1123 1124 if (of_get_property(np, "shared-pin", NULL)) 1125 rsnd_flags_set(ssi, RSND_SSI_CLK_PIN_SHARE); 1126 1127 if (of_get_property(np, "no-busif", NULL)) 1128 rsnd_flags_set(ssi, RSND_SSI_NO_BUSIF); 1129 1130 ssi->irq = irq_of_parse_and_map(np, 0); 1131 if (!ssi->irq) { 1132 ret = -EINVAL; 1133 of_node_put(np); 1134 goto rsnd_ssi_probe_done; 1135 } 1136 1137 if (of_property_read_bool(np, "pio-transfer")) 1138 ops = &rsnd_ssi_pio_ops; 1139 else 1140 ops = &rsnd_ssi_dma_ops; 1141 1142 ret = rsnd_mod_init(priv, rsnd_mod_get(ssi), ops, clk, 1143 rsnd_ssi_get_status, RSND_MOD_SSI, i); 1144 if (ret) { 1145 of_node_put(np); 1146 goto rsnd_ssi_probe_done; 1147 } 1148 skip: 1149 i++; 1150 } 1151 1152 ret = 0; 1153 1154 rsnd_ssi_probe_done: 1155 of_node_put(node); 1156 1157 return ret; 1158 } 1159 1160 void rsnd_ssi_remove(struct rsnd_priv *priv) 1161 { 1162 struct rsnd_ssi *ssi; 1163 int i; 1164 1165 for_each_rsnd_ssi(ssi, priv, i) { 1166 rsnd_mod_quit(rsnd_mod_get(ssi)); 1167 } 1168 } 1169