1 // SPDX-License-Identifier: (GPL-2.0 OR BSD-3-Clause) 2 // Copyright(c) 2015-18 Intel Corporation. 3 4 /* 5 * stream.c - SoundWire Bus stream operations. 6 */ 7 8 #include <linux/delay.h> 9 #include <linux/device.h> 10 #include <linux/init.h> 11 #include <linux/module.h> 12 #include <linux/mod_devicetable.h> 13 #include <linux/slab.h> 14 #include <linux/soundwire/sdw_registers.h> 15 #include <linux/soundwire/sdw.h> 16 #include <sound/soc.h> 17 #include "bus.h" 18 19 /* 20 * Array of supported rows and columns as per MIPI SoundWire Specification 1.1 21 * 22 * The rows are arranged as per the array index value programmed 23 * in register. The index 15 has dummy value 0 in order to fill hole. 24 */ 25 int sdw_rows[SDW_FRAME_ROWS] = {48, 50, 60, 64, 75, 80, 125, 147, 26 96, 100, 120, 128, 150, 160, 250, 0, 27 192, 200, 240, 256, 72, 144, 90, 180}; 28 EXPORT_SYMBOL(sdw_rows); 29 30 int sdw_cols[SDW_FRAME_COLS] = {2, 4, 6, 8, 10, 12, 14, 16}; 31 EXPORT_SYMBOL(sdw_cols); 32 33 int sdw_find_col_index(int col) 34 { 35 int i; 36 37 for (i = 0; i < SDW_FRAME_COLS; i++) { 38 if (sdw_cols[i] == col) 39 return i; 40 } 41 42 pr_warn("Requested column not found, selecting lowest column no: 2\n"); 43 return 0; 44 } 45 EXPORT_SYMBOL(sdw_find_col_index); 46 47 int sdw_find_row_index(int row) 48 { 49 int i; 50 51 for (i = 0; i < SDW_FRAME_ROWS; i++) { 52 if (sdw_rows[i] == row) 53 return i; 54 } 55 56 pr_warn("Requested row not found, selecting lowest row no: 48\n"); 57 return 0; 58 } 59 EXPORT_SYMBOL(sdw_find_row_index); 60 61 static int _sdw_program_slave_port_params(struct sdw_bus *bus, 62 struct sdw_slave *slave, 63 struct sdw_transport_params *t_params, 64 enum sdw_dpn_type type) 65 { 66 u32 addr1, addr2, addr3, addr4; 67 int ret; 68 u16 wbuf; 69 70 if (bus->params.next_bank) { 71 addr1 = SDW_DPN_OFFSETCTRL2_B1(t_params->port_num); 72 addr2 = SDW_DPN_BLOCKCTRL3_B1(t_params->port_num); 73 addr3 = SDW_DPN_SAMPLECTRL2_B1(t_params->port_num); 74 addr4 = SDW_DPN_HCTRL_B1(t_params->port_num); 75 } else { 76 addr1 = SDW_DPN_OFFSETCTRL2_B0(t_params->port_num); 77 addr2 = SDW_DPN_BLOCKCTRL3_B0(t_params->port_num); 78 addr3 = SDW_DPN_SAMPLECTRL2_B0(t_params->port_num); 79 addr4 = SDW_DPN_HCTRL_B0(t_params->port_num); 80 } 81 82 /* Program DPN_OffsetCtrl2 registers */ 83 ret = sdw_write(slave, addr1, t_params->offset2); 84 if (ret < 0) { 85 dev_err(bus->dev, "DPN_OffsetCtrl2 register write failed\n"); 86 return ret; 87 } 88 89 /* Program DPN_BlockCtrl3 register */ 90 ret = sdw_write(slave, addr2, t_params->blk_pkg_mode); 91 if (ret < 0) { 92 dev_err(bus->dev, "DPN_BlockCtrl3 register write failed\n"); 93 return ret; 94 } 95 96 /* 97 * Data ports are FULL, SIMPLE and REDUCED. This function handles 98 * FULL and REDUCED only and beyond this point only FULL is 99 * handled, so bail out if we are not FULL data port type 100 */ 101 if (type != SDW_DPN_FULL) 102 return ret; 103 104 /* Program DPN_SampleCtrl2 register */ 105 wbuf = FIELD_GET(SDW_DPN_SAMPLECTRL_HIGH, t_params->sample_interval - 1); 106 107 ret = sdw_write(slave, addr3, wbuf); 108 if (ret < 0) { 109 dev_err(bus->dev, "DPN_SampleCtrl2 register write failed\n"); 110 return ret; 111 } 112 113 /* Program DPN_HCtrl register */ 114 wbuf = FIELD_PREP(SDW_DPN_HCTRL_HSTART, t_params->hstart); 115 wbuf |= FIELD_PREP(SDW_DPN_HCTRL_HSTOP, t_params->hstop); 116 117 ret = sdw_write(slave, addr4, wbuf); 118 if (ret < 0) 119 dev_err(bus->dev, "DPN_HCtrl register write failed\n"); 120 121 return ret; 122 } 123 124 static int sdw_program_slave_port_params(struct sdw_bus *bus, 125 struct sdw_slave_runtime *s_rt, 126 struct sdw_port_runtime *p_rt) 127 { 128 struct sdw_transport_params *t_params = &p_rt->transport_params; 129 struct sdw_port_params *p_params = &p_rt->port_params; 130 struct sdw_slave_prop *slave_prop = &s_rt->slave->prop; 131 u32 addr1, addr2, addr3, addr4, addr5, addr6; 132 struct sdw_dpn_prop *dpn_prop; 133 int ret; 134 u8 wbuf; 135 136 dpn_prop = sdw_get_slave_dpn_prop(s_rt->slave, 137 s_rt->direction, 138 t_params->port_num); 139 if (!dpn_prop) 140 return -EINVAL; 141 142 addr1 = SDW_DPN_PORTCTRL(t_params->port_num); 143 addr2 = SDW_DPN_BLOCKCTRL1(t_params->port_num); 144 145 if (bus->params.next_bank) { 146 addr3 = SDW_DPN_SAMPLECTRL1_B1(t_params->port_num); 147 addr4 = SDW_DPN_OFFSETCTRL1_B1(t_params->port_num); 148 addr5 = SDW_DPN_BLOCKCTRL2_B1(t_params->port_num); 149 addr6 = SDW_DPN_LANECTRL_B1(t_params->port_num); 150 151 } else { 152 addr3 = SDW_DPN_SAMPLECTRL1_B0(t_params->port_num); 153 addr4 = SDW_DPN_OFFSETCTRL1_B0(t_params->port_num); 154 addr5 = SDW_DPN_BLOCKCTRL2_B0(t_params->port_num); 155 addr6 = SDW_DPN_LANECTRL_B0(t_params->port_num); 156 } 157 158 /* Program DPN_PortCtrl register */ 159 wbuf = FIELD_PREP(SDW_DPN_PORTCTRL_DATAMODE, p_params->data_mode); 160 wbuf |= FIELD_PREP(SDW_DPN_PORTCTRL_FLOWMODE, p_params->flow_mode); 161 162 ret = sdw_update(s_rt->slave, addr1, 0xF, wbuf); 163 if (ret < 0) { 164 dev_err(&s_rt->slave->dev, 165 "DPN_PortCtrl register write failed for port %d\n", 166 t_params->port_num); 167 return ret; 168 } 169 170 if (!dpn_prop->read_only_wordlength) { 171 /* Program DPN_BlockCtrl1 register */ 172 ret = sdw_write(s_rt->slave, addr2, (p_params->bps - 1)); 173 if (ret < 0) { 174 dev_err(&s_rt->slave->dev, 175 "DPN_BlockCtrl1 register write failed for port %d\n", 176 t_params->port_num); 177 return ret; 178 } 179 } 180 181 /* Program DPN_SampleCtrl1 register */ 182 wbuf = (t_params->sample_interval - 1) & SDW_DPN_SAMPLECTRL_LOW; 183 ret = sdw_write(s_rt->slave, addr3, wbuf); 184 if (ret < 0) { 185 dev_err(&s_rt->slave->dev, 186 "DPN_SampleCtrl1 register write failed for port %d\n", 187 t_params->port_num); 188 return ret; 189 } 190 191 /* Program DPN_OffsetCtrl1 registers */ 192 ret = sdw_write(s_rt->slave, addr4, t_params->offset1); 193 if (ret < 0) { 194 dev_err(&s_rt->slave->dev, 195 "DPN_OffsetCtrl1 register write failed for port %d\n", 196 t_params->port_num); 197 return ret; 198 } 199 200 /* Program DPN_BlockCtrl2 register*/ 201 if (t_params->blk_grp_ctrl_valid) { 202 ret = sdw_write(s_rt->slave, addr5, t_params->blk_grp_ctrl); 203 if (ret < 0) { 204 dev_err(&s_rt->slave->dev, 205 "DPN_BlockCtrl2 reg write failed for port %d\n", 206 t_params->port_num); 207 return ret; 208 } 209 } 210 211 /* program DPN_LaneCtrl register */ 212 if (slave_prop->lane_control_support) { 213 ret = sdw_write(s_rt->slave, addr6, t_params->lane_ctrl); 214 if (ret < 0) { 215 dev_err(&s_rt->slave->dev, 216 "DPN_LaneCtrl register write failed for port %d\n", 217 t_params->port_num); 218 return ret; 219 } 220 } 221 222 if (dpn_prop->type != SDW_DPN_SIMPLE) { 223 ret = _sdw_program_slave_port_params(bus, s_rt->slave, 224 t_params, dpn_prop->type); 225 if (ret < 0) 226 dev_err(&s_rt->slave->dev, 227 "Transport reg write failed for port: %d\n", 228 t_params->port_num); 229 } 230 231 return ret; 232 } 233 234 static int sdw_program_master_port_params(struct sdw_bus *bus, 235 struct sdw_port_runtime *p_rt) 236 { 237 int ret; 238 239 /* 240 * we need to set transport and port parameters for the port. 241 * Transport parameters refers to the sample interval, offsets and 242 * hstart/stop etc of the data. Port parameters refers to word 243 * length, flow mode etc of the port 244 */ 245 ret = bus->port_ops->dpn_set_port_transport_params(bus, 246 &p_rt->transport_params, 247 bus->params.next_bank); 248 if (ret < 0) 249 return ret; 250 251 return bus->port_ops->dpn_set_port_params(bus, 252 &p_rt->port_params, 253 bus->params.next_bank); 254 } 255 256 /** 257 * sdw_program_port_params() - Programs transport parameters of Master(s) 258 * and Slave(s) 259 * 260 * @m_rt: Master stream runtime 261 */ 262 static int sdw_program_port_params(struct sdw_master_runtime *m_rt) 263 { 264 struct sdw_slave_runtime *s_rt = NULL; 265 struct sdw_bus *bus = m_rt->bus; 266 struct sdw_port_runtime *p_rt; 267 int ret = 0; 268 269 /* Program transport & port parameters for Slave(s) */ 270 list_for_each_entry(s_rt, &m_rt->slave_rt_list, m_rt_node) { 271 list_for_each_entry(p_rt, &s_rt->port_list, port_node) { 272 ret = sdw_program_slave_port_params(bus, s_rt, p_rt); 273 if (ret < 0) 274 return ret; 275 } 276 } 277 278 /* Program transport & port parameters for Master(s) */ 279 list_for_each_entry(p_rt, &m_rt->port_list, port_node) { 280 ret = sdw_program_master_port_params(bus, p_rt); 281 if (ret < 0) 282 return ret; 283 } 284 285 return 0; 286 } 287 288 /** 289 * sdw_enable_disable_slave_ports: Enable/disable slave data port 290 * 291 * @bus: bus instance 292 * @s_rt: slave runtime 293 * @p_rt: port runtime 294 * @en: enable or disable operation 295 * 296 * This function only sets the enable/disable bits in the relevant bank, the 297 * actual enable/disable is done with a bank switch 298 */ 299 static int sdw_enable_disable_slave_ports(struct sdw_bus *bus, 300 struct sdw_slave_runtime *s_rt, 301 struct sdw_port_runtime *p_rt, 302 bool en) 303 { 304 struct sdw_transport_params *t_params = &p_rt->transport_params; 305 u32 addr; 306 int ret; 307 308 if (bus->params.next_bank) 309 addr = SDW_DPN_CHANNELEN_B1(p_rt->num); 310 else 311 addr = SDW_DPN_CHANNELEN_B0(p_rt->num); 312 313 /* 314 * Since bus doesn't support sharing a port across two streams, 315 * it is safe to reset this register 316 */ 317 if (en) 318 ret = sdw_write(s_rt->slave, addr, p_rt->ch_mask); 319 else 320 ret = sdw_write(s_rt->slave, addr, 0x0); 321 322 if (ret < 0) 323 dev_err(&s_rt->slave->dev, 324 "Slave chn_en reg write failed:%d port:%d\n", 325 ret, t_params->port_num); 326 327 return ret; 328 } 329 330 static int sdw_enable_disable_master_ports(struct sdw_master_runtime *m_rt, 331 struct sdw_port_runtime *p_rt, 332 bool en) 333 { 334 struct sdw_transport_params *t_params = &p_rt->transport_params; 335 struct sdw_bus *bus = m_rt->bus; 336 struct sdw_enable_ch enable_ch; 337 int ret; 338 339 enable_ch.port_num = p_rt->num; 340 enable_ch.ch_mask = p_rt->ch_mask; 341 enable_ch.enable = en; 342 343 /* Perform Master port channel(s) enable/disable */ 344 if (bus->port_ops->dpn_port_enable_ch) { 345 ret = bus->port_ops->dpn_port_enable_ch(bus, 346 &enable_ch, 347 bus->params.next_bank); 348 if (ret < 0) { 349 dev_err(bus->dev, 350 "Master chn_en write failed:%d port:%d\n", 351 ret, t_params->port_num); 352 return ret; 353 } 354 } else { 355 dev_err(bus->dev, 356 "dpn_port_enable_ch not supported, %s failed\n", 357 en ? "enable" : "disable"); 358 return -EINVAL; 359 } 360 361 return 0; 362 } 363 364 /** 365 * sdw_enable_disable_ports() - Enable/disable port(s) for Master and 366 * Slave(s) 367 * 368 * @m_rt: Master stream runtime 369 * @en: mode (enable/disable) 370 */ 371 static int sdw_enable_disable_ports(struct sdw_master_runtime *m_rt, bool en) 372 { 373 struct sdw_port_runtime *s_port, *m_port; 374 struct sdw_slave_runtime *s_rt; 375 int ret = 0; 376 377 /* Enable/Disable Slave port(s) */ 378 list_for_each_entry(s_rt, &m_rt->slave_rt_list, m_rt_node) { 379 list_for_each_entry(s_port, &s_rt->port_list, port_node) { 380 ret = sdw_enable_disable_slave_ports(m_rt->bus, s_rt, 381 s_port, en); 382 if (ret < 0) 383 return ret; 384 } 385 } 386 387 /* Enable/Disable Master port(s) */ 388 list_for_each_entry(m_port, &m_rt->port_list, port_node) { 389 ret = sdw_enable_disable_master_ports(m_rt, m_port, en); 390 if (ret < 0) 391 return ret; 392 } 393 394 return 0; 395 } 396 397 static int sdw_do_port_prep(struct sdw_slave_runtime *s_rt, 398 struct sdw_prepare_ch prep_ch, 399 enum sdw_port_prep_ops cmd) 400 { 401 const struct sdw_slave_ops *ops = s_rt->slave->ops; 402 int ret; 403 404 if (ops->port_prep) { 405 ret = ops->port_prep(s_rt->slave, &prep_ch, cmd); 406 if (ret < 0) { 407 dev_err(&s_rt->slave->dev, 408 "Slave Port Prep cmd %d failed: %d\n", 409 cmd, ret); 410 return ret; 411 } 412 } 413 414 return 0; 415 } 416 417 static int sdw_prep_deprep_slave_ports(struct sdw_bus *bus, 418 struct sdw_slave_runtime *s_rt, 419 struct sdw_port_runtime *p_rt, 420 bool prep) 421 { 422 struct completion *port_ready; 423 struct sdw_dpn_prop *dpn_prop; 424 struct sdw_prepare_ch prep_ch; 425 unsigned int time_left; 426 bool intr = false; 427 int ret = 0, val; 428 u32 addr; 429 430 prep_ch.num = p_rt->num; 431 prep_ch.ch_mask = p_rt->ch_mask; 432 433 dpn_prop = sdw_get_slave_dpn_prop(s_rt->slave, 434 s_rt->direction, 435 prep_ch.num); 436 if (!dpn_prop) { 437 dev_err(bus->dev, 438 "Slave Port:%d properties not found\n", prep_ch.num); 439 return -EINVAL; 440 } 441 442 prep_ch.prepare = prep; 443 444 prep_ch.bank = bus->params.next_bank; 445 446 if (dpn_prop->imp_def_interrupts || !dpn_prop->simple_ch_prep_sm) 447 intr = true; 448 449 /* 450 * Enable interrupt before Port prepare. 451 * For Port de-prepare, it is assumed that port 452 * was prepared earlier 453 */ 454 if (prep && intr) { 455 ret = sdw_configure_dpn_intr(s_rt->slave, p_rt->num, prep, 456 dpn_prop->imp_def_interrupts); 457 if (ret < 0) 458 return ret; 459 } 460 461 /* Inform slave about the impending port prepare */ 462 sdw_do_port_prep(s_rt, prep_ch, SDW_OPS_PORT_PRE_PREP); 463 464 /* Prepare Slave port implementing CP_SM */ 465 if (!dpn_prop->simple_ch_prep_sm) { 466 addr = SDW_DPN_PREPARECTRL(p_rt->num); 467 468 if (prep) 469 ret = sdw_write(s_rt->slave, addr, p_rt->ch_mask); 470 else 471 ret = sdw_write(s_rt->slave, addr, 0x0); 472 473 if (ret < 0) { 474 dev_err(&s_rt->slave->dev, 475 "Slave prep_ctrl reg write failed\n"); 476 return ret; 477 } 478 479 /* Wait for completion on port ready */ 480 port_ready = &s_rt->slave->port_ready[prep_ch.num]; 481 time_left = wait_for_completion_timeout(port_ready, 482 msecs_to_jiffies(dpn_prop->ch_prep_timeout)); 483 484 val = sdw_read(s_rt->slave, SDW_DPN_PREPARESTATUS(p_rt->num)); 485 val &= p_rt->ch_mask; 486 if (!time_left || val) { 487 dev_err(&s_rt->slave->dev, 488 "Chn prep failed for port:%d\n", prep_ch.num); 489 return -ETIMEDOUT; 490 } 491 } 492 493 /* Inform slaves about ports prepared */ 494 sdw_do_port_prep(s_rt, prep_ch, SDW_OPS_PORT_POST_PREP); 495 496 /* Disable interrupt after Port de-prepare */ 497 if (!prep && intr) 498 ret = sdw_configure_dpn_intr(s_rt->slave, p_rt->num, prep, 499 dpn_prop->imp_def_interrupts); 500 501 return ret; 502 } 503 504 static int sdw_prep_deprep_master_ports(struct sdw_master_runtime *m_rt, 505 struct sdw_port_runtime *p_rt, 506 bool prep) 507 { 508 struct sdw_transport_params *t_params = &p_rt->transport_params; 509 struct sdw_bus *bus = m_rt->bus; 510 const struct sdw_master_port_ops *ops = bus->port_ops; 511 struct sdw_prepare_ch prep_ch; 512 int ret = 0; 513 514 prep_ch.num = p_rt->num; 515 prep_ch.ch_mask = p_rt->ch_mask; 516 prep_ch.prepare = prep; /* Prepare/De-prepare */ 517 prep_ch.bank = bus->params.next_bank; 518 519 /* Pre-prepare/Pre-deprepare port(s) */ 520 if (ops->dpn_port_prep) { 521 ret = ops->dpn_port_prep(bus, &prep_ch); 522 if (ret < 0) { 523 dev_err(bus->dev, "Port prepare failed for port:%d\n", 524 t_params->port_num); 525 return ret; 526 } 527 } 528 529 return ret; 530 } 531 532 /** 533 * sdw_prep_deprep_ports() - Prepare/De-prepare port(s) for Master(s) and 534 * Slave(s) 535 * 536 * @m_rt: Master runtime handle 537 * @prep: Prepare or De-prepare 538 */ 539 static int sdw_prep_deprep_ports(struct sdw_master_runtime *m_rt, bool prep) 540 { 541 struct sdw_slave_runtime *s_rt; 542 struct sdw_port_runtime *p_rt; 543 int ret = 0; 544 545 /* Prepare/De-prepare Slave port(s) */ 546 list_for_each_entry(s_rt, &m_rt->slave_rt_list, m_rt_node) { 547 list_for_each_entry(p_rt, &s_rt->port_list, port_node) { 548 ret = sdw_prep_deprep_slave_ports(m_rt->bus, s_rt, 549 p_rt, prep); 550 if (ret < 0) 551 return ret; 552 } 553 } 554 555 /* Prepare/De-prepare Master port(s) */ 556 list_for_each_entry(p_rt, &m_rt->port_list, port_node) { 557 ret = sdw_prep_deprep_master_ports(m_rt, p_rt, prep); 558 if (ret < 0) 559 return ret; 560 } 561 562 return ret; 563 } 564 565 /** 566 * sdw_notify_config() - Notify bus configuration 567 * 568 * @m_rt: Master runtime handle 569 * 570 * This function notifies the Master(s) and Slave(s) of the 571 * new bus configuration. 572 */ 573 static int sdw_notify_config(struct sdw_master_runtime *m_rt) 574 { 575 struct sdw_slave_runtime *s_rt; 576 struct sdw_bus *bus = m_rt->bus; 577 struct sdw_slave *slave; 578 int ret = 0; 579 580 if (bus->ops->set_bus_conf) { 581 ret = bus->ops->set_bus_conf(bus, &bus->params); 582 if (ret < 0) 583 return ret; 584 } 585 586 list_for_each_entry(s_rt, &m_rt->slave_rt_list, m_rt_node) { 587 slave = s_rt->slave; 588 589 if (slave->ops->bus_config) { 590 ret = slave->ops->bus_config(slave, &bus->params); 591 if (ret < 0) { 592 dev_err(bus->dev, "Notify Slave: %d failed\n", 593 slave->dev_num); 594 return ret; 595 } 596 } 597 } 598 599 return ret; 600 } 601 602 /** 603 * sdw_program_params() - Program transport and port parameters for Master(s) 604 * and Slave(s) 605 * 606 * @bus: SDW bus instance 607 * @prepare: true if sdw_program_params() is called by _prepare. 608 */ 609 static int sdw_program_params(struct sdw_bus *bus, bool prepare) 610 { 611 struct sdw_master_runtime *m_rt; 612 int ret = 0; 613 614 list_for_each_entry(m_rt, &bus->m_rt_list, bus_node) { 615 616 /* 617 * this loop walks through all master runtimes for a 618 * bus, but the ports can only be configured while 619 * explicitly preparing a stream or handling an 620 * already-prepared stream otherwise. 621 */ 622 if (!prepare && 623 m_rt->stream->state == SDW_STREAM_CONFIGURED) 624 continue; 625 626 ret = sdw_program_port_params(m_rt); 627 if (ret < 0) { 628 dev_err(bus->dev, 629 "Program transport params failed: %d\n", ret); 630 return ret; 631 } 632 633 ret = sdw_notify_config(m_rt); 634 if (ret < 0) { 635 dev_err(bus->dev, 636 "Notify bus config failed: %d\n", ret); 637 return ret; 638 } 639 640 /* Enable port(s) on alternate bank for all active streams */ 641 if (m_rt->stream->state != SDW_STREAM_ENABLED) 642 continue; 643 644 ret = sdw_enable_disable_ports(m_rt, true); 645 if (ret < 0) { 646 dev_err(bus->dev, "Enable channel failed: %d\n", ret); 647 return ret; 648 } 649 } 650 651 return ret; 652 } 653 654 static int sdw_bank_switch(struct sdw_bus *bus, int m_rt_count) 655 { 656 int col_index, row_index; 657 bool multi_link; 658 struct sdw_msg *wr_msg; 659 u8 *wbuf; 660 int ret; 661 u16 addr; 662 663 wr_msg = kzalloc(sizeof(*wr_msg), GFP_KERNEL); 664 if (!wr_msg) 665 return -ENOMEM; 666 667 bus->defer_msg.msg = wr_msg; 668 669 wbuf = kzalloc(sizeof(*wbuf), GFP_KERNEL); 670 if (!wbuf) { 671 ret = -ENOMEM; 672 goto error_1; 673 } 674 675 /* Get row and column index to program register */ 676 col_index = sdw_find_col_index(bus->params.col); 677 row_index = sdw_find_row_index(bus->params.row); 678 wbuf[0] = col_index | (row_index << 3); 679 680 if (bus->params.next_bank) 681 addr = SDW_SCP_FRAMECTRL_B1; 682 else 683 addr = SDW_SCP_FRAMECTRL_B0; 684 685 sdw_fill_msg(wr_msg, NULL, addr, 1, SDW_BROADCAST_DEV_NUM, 686 SDW_MSG_FLAG_WRITE, wbuf); 687 wr_msg->ssp_sync = true; 688 689 /* 690 * Set the multi_link flag only when both the hardware supports 691 * and hardware-based sync is required 692 */ 693 multi_link = bus->multi_link && (m_rt_count >= bus->hw_sync_min_links); 694 695 if (multi_link) 696 ret = sdw_transfer_defer(bus, wr_msg, &bus->defer_msg); 697 else 698 ret = sdw_transfer(bus, wr_msg); 699 700 if (ret < 0) { 701 dev_err(bus->dev, "Slave frame_ctrl reg write failed\n"); 702 goto error; 703 } 704 705 if (!multi_link) { 706 kfree(wr_msg); 707 kfree(wbuf); 708 bus->defer_msg.msg = NULL; 709 bus->params.curr_bank = !bus->params.curr_bank; 710 bus->params.next_bank = !bus->params.next_bank; 711 } 712 713 return 0; 714 715 error: 716 kfree(wbuf); 717 error_1: 718 kfree(wr_msg); 719 return ret; 720 } 721 722 /** 723 * sdw_ml_sync_bank_switch: Multilink register bank switch 724 * 725 * @bus: SDW bus instance 726 * 727 * Caller function should free the buffers on error 728 */ 729 static int sdw_ml_sync_bank_switch(struct sdw_bus *bus) 730 { 731 unsigned long time_left; 732 733 if (!bus->multi_link) 734 return 0; 735 736 /* Wait for completion of transfer */ 737 time_left = wait_for_completion_timeout(&bus->defer_msg.complete, 738 bus->bank_switch_timeout); 739 740 if (!time_left) { 741 dev_err(bus->dev, "Controller Timed out on bank switch\n"); 742 return -ETIMEDOUT; 743 } 744 745 bus->params.curr_bank = !bus->params.curr_bank; 746 bus->params.next_bank = !bus->params.next_bank; 747 748 if (bus->defer_msg.msg) { 749 kfree(bus->defer_msg.msg->buf); 750 kfree(bus->defer_msg.msg); 751 } 752 753 return 0; 754 } 755 756 static int do_bank_switch(struct sdw_stream_runtime *stream) 757 { 758 struct sdw_master_runtime *m_rt; 759 const struct sdw_master_ops *ops; 760 struct sdw_bus *bus; 761 bool multi_link = false; 762 int m_rt_count; 763 int ret = 0; 764 765 m_rt_count = stream->m_rt_count; 766 767 list_for_each_entry(m_rt, &stream->master_list, stream_node) { 768 bus = m_rt->bus; 769 ops = bus->ops; 770 771 if (bus->multi_link && m_rt_count >= bus->hw_sync_min_links) { 772 multi_link = true; 773 mutex_lock(&bus->msg_lock); 774 } 775 776 /* Pre-bank switch */ 777 if (ops->pre_bank_switch) { 778 ret = ops->pre_bank_switch(bus); 779 if (ret < 0) { 780 dev_err(bus->dev, 781 "Pre bank switch op failed: %d\n", ret); 782 goto msg_unlock; 783 } 784 } 785 786 /* 787 * Perform Bank switch operation. 788 * For multi link cases, the actual bank switch is 789 * synchronized across all Masters and happens later as a 790 * part of post_bank_switch ops. 791 */ 792 ret = sdw_bank_switch(bus, m_rt_count); 793 if (ret < 0) { 794 dev_err(bus->dev, "Bank switch failed: %d\n", ret); 795 goto error; 796 } 797 } 798 799 /* 800 * For multi link cases, it is expected that the bank switch is 801 * triggered by the post_bank_switch for the first Master in the list 802 * and for the other Masters the post_bank_switch() should return doing 803 * nothing. 804 */ 805 list_for_each_entry(m_rt, &stream->master_list, stream_node) { 806 bus = m_rt->bus; 807 ops = bus->ops; 808 809 /* Post-bank switch */ 810 if (ops->post_bank_switch) { 811 ret = ops->post_bank_switch(bus); 812 if (ret < 0) { 813 dev_err(bus->dev, 814 "Post bank switch op failed: %d\n", 815 ret); 816 goto error; 817 } 818 } else if (multi_link) { 819 dev_err(bus->dev, 820 "Post bank switch ops not implemented\n"); 821 goto error; 822 } 823 824 /* Set the bank switch timeout to default, if not set */ 825 if (!bus->bank_switch_timeout) 826 bus->bank_switch_timeout = DEFAULT_BANK_SWITCH_TIMEOUT; 827 828 /* Check if bank switch was successful */ 829 ret = sdw_ml_sync_bank_switch(bus); 830 if (ret < 0) { 831 dev_err(bus->dev, 832 "multi link bank switch failed: %d\n", ret); 833 goto error; 834 } 835 836 if (multi_link) 837 mutex_unlock(&bus->msg_lock); 838 } 839 840 return ret; 841 842 error: 843 list_for_each_entry(m_rt, &stream->master_list, stream_node) { 844 bus = m_rt->bus; 845 846 kfree(bus->defer_msg.msg->buf); 847 kfree(bus->defer_msg.msg); 848 } 849 850 msg_unlock: 851 852 if (multi_link) { 853 list_for_each_entry(m_rt, &stream->master_list, stream_node) { 854 bus = m_rt->bus; 855 if (mutex_is_locked(&bus->msg_lock)) 856 mutex_unlock(&bus->msg_lock); 857 } 858 } 859 860 return ret; 861 } 862 863 /** 864 * sdw_release_stream() - Free the assigned stream runtime 865 * 866 * @stream: SoundWire stream runtime 867 * 868 * sdw_release_stream should be called only once per stream 869 */ 870 void sdw_release_stream(struct sdw_stream_runtime *stream) 871 { 872 kfree(stream); 873 } 874 EXPORT_SYMBOL(sdw_release_stream); 875 876 /** 877 * sdw_alloc_stream() - Allocate and return stream runtime 878 * 879 * @stream_name: SoundWire stream name 880 * 881 * Allocates a SoundWire stream runtime instance. 882 * sdw_alloc_stream should be called only once per stream. Typically 883 * invoked from ALSA/ASoC machine/platform driver. 884 */ 885 struct sdw_stream_runtime *sdw_alloc_stream(const char *stream_name) 886 { 887 struct sdw_stream_runtime *stream; 888 889 stream = kzalloc(sizeof(*stream), GFP_KERNEL); 890 if (!stream) 891 return NULL; 892 893 stream->name = stream_name; 894 INIT_LIST_HEAD(&stream->master_list); 895 stream->state = SDW_STREAM_ALLOCATED; 896 stream->m_rt_count = 0; 897 898 return stream; 899 } 900 EXPORT_SYMBOL(sdw_alloc_stream); 901 902 static struct sdw_master_runtime 903 *sdw_find_master_rt(struct sdw_bus *bus, 904 struct sdw_stream_runtime *stream) 905 { 906 struct sdw_master_runtime *m_rt; 907 908 /* Retrieve Bus handle if already available */ 909 list_for_each_entry(m_rt, &stream->master_list, stream_node) { 910 if (m_rt->bus == bus) 911 return m_rt; 912 } 913 914 return NULL; 915 } 916 917 /** 918 * sdw_alloc_master_rt() - Allocates and initialize Master runtime handle 919 * 920 * @bus: SDW bus instance 921 * @stream_config: Stream configuration 922 * @stream: Stream runtime handle. 923 * 924 * This function is to be called with bus_lock held. 925 */ 926 static struct sdw_master_runtime 927 *sdw_alloc_master_rt(struct sdw_bus *bus, 928 struct sdw_stream_config *stream_config, 929 struct sdw_stream_runtime *stream) 930 { 931 struct sdw_master_runtime *m_rt; 932 933 /* 934 * check if Master is already allocated (as a result of Slave adding 935 * it first), if so skip allocation and go to configure 936 */ 937 m_rt = sdw_find_master_rt(bus, stream); 938 if (m_rt) 939 goto stream_config; 940 941 m_rt = kzalloc(sizeof(*m_rt), GFP_KERNEL); 942 if (!m_rt) 943 return NULL; 944 945 /* Initialization of Master runtime handle */ 946 INIT_LIST_HEAD(&m_rt->port_list); 947 INIT_LIST_HEAD(&m_rt->slave_rt_list); 948 list_add_tail(&m_rt->stream_node, &stream->master_list); 949 950 list_add_tail(&m_rt->bus_node, &bus->m_rt_list); 951 952 stream_config: 953 m_rt->ch_count = stream_config->ch_count; 954 m_rt->bus = bus; 955 m_rt->stream = stream; 956 m_rt->direction = stream_config->direction; 957 958 return m_rt; 959 } 960 961 /** 962 * sdw_alloc_slave_rt() - Allocate and initialize Slave runtime handle. 963 * 964 * @slave: Slave handle 965 * @stream_config: Stream configuration 966 * @stream: Stream runtime handle 967 * 968 * This function is to be called with bus_lock held. 969 */ 970 static struct sdw_slave_runtime 971 *sdw_alloc_slave_rt(struct sdw_slave *slave, 972 struct sdw_stream_config *stream_config, 973 struct sdw_stream_runtime *stream) 974 { 975 struct sdw_slave_runtime *s_rt; 976 977 s_rt = kzalloc(sizeof(*s_rt), GFP_KERNEL); 978 if (!s_rt) 979 return NULL; 980 981 INIT_LIST_HEAD(&s_rt->port_list); 982 s_rt->ch_count = stream_config->ch_count; 983 s_rt->direction = stream_config->direction; 984 s_rt->slave = slave; 985 986 return s_rt; 987 } 988 989 static void sdw_master_port_release(struct sdw_bus *bus, 990 struct sdw_master_runtime *m_rt) 991 { 992 struct sdw_port_runtime *p_rt, *_p_rt; 993 994 list_for_each_entry_safe(p_rt, _p_rt, &m_rt->port_list, port_node) { 995 list_del(&p_rt->port_node); 996 kfree(p_rt); 997 } 998 } 999 1000 static void sdw_slave_port_release(struct sdw_bus *bus, 1001 struct sdw_slave *slave, 1002 struct sdw_stream_runtime *stream) 1003 { 1004 struct sdw_port_runtime *p_rt, *_p_rt; 1005 struct sdw_master_runtime *m_rt; 1006 struct sdw_slave_runtime *s_rt; 1007 1008 list_for_each_entry(m_rt, &stream->master_list, stream_node) { 1009 list_for_each_entry(s_rt, &m_rt->slave_rt_list, m_rt_node) { 1010 if (s_rt->slave != slave) 1011 continue; 1012 1013 list_for_each_entry_safe(p_rt, _p_rt, 1014 &s_rt->port_list, port_node) { 1015 list_del(&p_rt->port_node); 1016 kfree(p_rt); 1017 } 1018 } 1019 } 1020 } 1021 1022 /** 1023 * sdw_release_slave_stream() - Free Slave(s) runtime handle 1024 * 1025 * @slave: Slave handle. 1026 * @stream: Stream runtime handle. 1027 * 1028 * This function is to be called with bus_lock held. 1029 */ 1030 static void sdw_release_slave_stream(struct sdw_slave *slave, 1031 struct sdw_stream_runtime *stream) 1032 { 1033 struct sdw_slave_runtime *s_rt, *_s_rt; 1034 struct sdw_master_runtime *m_rt; 1035 1036 list_for_each_entry(m_rt, &stream->master_list, stream_node) { 1037 /* Retrieve Slave runtime handle */ 1038 list_for_each_entry_safe(s_rt, _s_rt, 1039 &m_rt->slave_rt_list, m_rt_node) { 1040 if (s_rt->slave == slave) { 1041 list_del(&s_rt->m_rt_node); 1042 kfree(s_rt); 1043 return; 1044 } 1045 } 1046 } 1047 } 1048 1049 /** 1050 * sdw_release_master_stream() - Free Master runtime handle 1051 * 1052 * @m_rt: Master runtime node 1053 * @stream: Stream runtime handle. 1054 * 1055 * This function is to be called with bus_lock held 1056 * It frees the Master runtime handle and associated Slave(s) runtime 1057 * handle. If this is called first then sdw_release_slave_stream() will have 1058 * no effect as Slave(s) runtime handle would already be freed up. 1059 */ 1060 static void sdw_release_master_stream(struct sdw_master_runtime *m_rt, 1061 struct sdw_stream_runtime *stream) 1062 { 1063 struct sdw_slave_runtime *s_rt, *_s_rt; 1064 1065 list_for_each_entry_safe(s_rt, _s_rt, &m_rt->slave_rt_list, m_rt_node) { 1066 sdw_slave_port_release(s_rt->slave->bus, s_rt->slave, stream); 1067 sdw_release_slave_stream(s_rt->slave, stream); 1068 } 1069 1070 list_del(&m_rt->stream_node); 1071 list_del(&m_rt->bus_node); 1072 kfree(m_rt); 1073 } 1074 1075 /** 1076 * sdw_stream_remove_master() - Remove master from sdw_stream 1077 * 1078 * @bus: SDW Bus instance 1079 * @stream: SoundWire stream 1080 * 1081 * This removes and frees port_rt and master_rt from a stream 1082 */ 1083 int sdw_stream_remove_master(struct sdw_bus *bus, 1084 struct sdw_stream_runtime *stream) 1085 { 1086 struct sdw_master_runtime *m_rt, *_m_rt; 1087 1088 mutex_lock(&bus->bus_lock); 1089 1090 list_for_each_entry_safe(m_rt, _m_rt, 1091 &stream->master_list, stream_node) { 1092 if (m_rt->bus != bus) 1093 continue; 1094 1095 sdw_master_port_release(bus, m_rt); 1096 sdw_release_master_stream(m_rt, stream); 1097 stream->m_rt_count--; 1098 } 1099 1100 if (list_empty(&stream->master_list)) 1101 stream->state = SDW_STREAM_RELEASED; 1102 1103 mutex_unlock(&bus->bus_lock); 1104 1105 return 0; 1106 } 1107 EXPORT_SYMBOL(sdw_stream_remove_master); 1108 1109 /** 1110 * sdw_stream_remove_slave() - Remove slave from sdw_stream 1111 * 1112 * @slave: SDW Slave instance 1113 * @stream: SoundWire stream 1114 * 1115 * This removes and frees port_rt and slave_rt from a stream 1116 */ 1117 int sdw_stream_remove_slave(struct sdw_slave *slave, 1118 struct sdw_stream_runtime *stream) 1119 { 1120 mutex_lock(&slave->bus->bus_lock); 1121 1122 sdw_slave_port_release(slave->bus, slave, stream); 1123 sdw_release_slave_stream(slave, stream); 1124 1125 mutex_unlock(&slave->bus->bus_lock); 1126 1127 return 0; 1128 } 1129 EXPORT_SYMBOL(sdw_stream_remove_slave); 1130 1131 /** 1132 * sdw_config_stream() - Configure the allocated stream 1133 * 1134 * @dev: SDW device 1135 * @stream: SoundWire stream 1136 * @stream_config: Stream configuration for audio stream 1137 * @is_slave: is API called from Slave or Master 1138 * 1139 * This function is to be called with bus_lock held. 1140 */ 1141 static int sdw_config_stream(struct device *dev, 1142 struct sdw_stream_runtime *stream, 1143 struct sdw_stream_config *stream_config, 1144 bool is_slave) 1145 { 1146 /* 1147 * Update the stream rate, channel and bps based on data 1148 * source. For more than one data source (multilink), 1149 * match the rate, bps, stream type and increment number of channels. 1150 * 1151 * If rate/bps is zero, it means the values are not set, so skip 1152 * comparison and allow the value to be set and stored in stream 1153 */ 1154 if (stream->params.rate && 1155 stream->params.rate != stream_config->frame_rate) { 1156 dev_err(dev, "rate not matching, stream:%s\n", stream->name); 1157 return -EINVAL; 1158 } 1159 1160 if (stream->params.bps && 1161 stream->params.bps != stream_config->bps) { 1162 dev_err(dev, "bps not matching, stream:%s\n", stream->name); 1163 return -EINVAL; 1164 } 1165 1166 stream->type = stream_config->type; 1167 stream->params.rate = stream_config->frame_rate; 1168 stream->params.bps = stream_config->bps; 1169 1170 /* TODO: Update this check during Device-device support */ 1171 if (is_slave) 1172 stream->params.ch_count += stream_config->ch_count; 1173 1174 return 0; 1175 } 1176 1177 static int sdw_is_valid_port_range(struct device *dev, 1178 struct sdw_port_runtime *p_rt) 1179 { 1180 if (!SDW_VALID_PORT_RANGE(p_rt->num)) { 1181 dev_err(dev, 1182 "SoundWire: Invalid port number :%d\n", p_rt->num); 1183 return -EINVAL; 1184 } 1185 1186 return 0; 1187 } 1188 1189 static struct sdw_port_runtime 1190 *sdw_port_alloc(struct device *dev, 1191 struct sdw_port_config *port_config, 1192 int port_index) 1193 { 1194 struct sdw_port_runtime *p_rt; 1195 1196 p_rt = kzalloc(sizeof(*p_rt), GFP_KERNEL); 1197 if (!p_rt) 1198 return NULL; 1199 1200 p_rt->ch_mask = port_config[port_index].ch_mask; 1201 p_rt->num = port_config[port_index].num; 1202 1203 return p_rt; 1204 } 1205 1206 static int sdw_master_port_config(struct sdw_bus *bus, 1207 struct sdw_master_runtime *m_rt, 1208 struct sdw_port_config *port_config, 1209 unsigned int num_ports) 1210 { 1211 struct sdw_port_runtime *p_rt; 1212 int i; 1213 1214 /* Iterate for number of ports to perform initialization */ 1215 for (i = 0; i < num_ports; i++) { 1216 p_rt = sdw_port_alloc(bus->dev, port_config, i); 1217 if (!p_rt) 1218 return -ENOMEM; 1219 1220 /* 1221 * TODO: Check port capabilities for requested 1222 * configuration (audio mode support) 1223 */ 1224 1225 list_add_tail(&p_rt->port_node, &m_rt->port_list); 1226 } 1227 1228 return 0; 1229 } 1230 1231 static int sdw_slave_port_config(struct sdw_slave *slave, 1232 struct sdw_slave_runtime *s_rt, 1233 struct sdw_port_config *port_config, 1234 unsigned int num_config) 1235 { 1236 struct sdw_port_runtime *p_rt; 1237 int i, ret; 1238 1239 /* Iterate for number of ports to perform initialization */ 1240 for (i = 0; i < num_config; i++) { 1241 p_rt = sdw_port_alloc(&slave->dev, port_config, i); 1242 if (!p_rt) 1243 return -ENOMEM; 1244 1245 /* 1246 * TODO: Check valid port range as defined by DisCo/ 1247 * slave 1248 */ 1249 ret = sdw_is_valid_port_range(&slave->dev, p_rt); 1250 if (ret < 0) { 1251 kfree(p_rt); 1252 return ret; 1253 } 1254 1255 /* 1256 * TODO: Check port capabilities for requested 1257 * configuration (audio mode support) 1258 */ 1259 1260 list_add_tail(&p_rt->port_node, &s_rt->port_list); 1261 } 1262 1263 return 0; 1264 } 1265 1266 /** 1267 * sdw_stream_add_master() - Allocate and add master runtime to a stream 1268 * 1269 * @bus: SDW Bus instance 1270 * @stream_config: Stream configuration for audio stream 1271 * @port_config: Port configuration for audio stream 1272 * @num_ports: Number of ports 1273 * @stream: SoundWire stream 1274 */ 1275 int sdw_stream_add_master(struct sdw_bus *bus, 1276 struct sdw_stream_config *stream_config, 1277 struct sdw_port_config *port_config, 1278 unsigned int num_ports, 1279 struct sdw_stream_runtime *stream) 1280 { 1281 struct sdw_master_runtime *m_rt; 1282 int ret; 1283 1284 mutex_lock(&bus->bus_lock); 1285 1286 /* 1287 * For multi link streams, add the second master only if 1288 * the bus supports it. 1289 * Check if bus->multi_link is set 1290 */ 1291 if (!bus->multi_link && stream->m_rt_count > 0) { 1292 dev_err(bus->dev, 1293 "Multilink not supported, link %d\n", bus->link_id); 1294 ret = -EINVAL; 1295 goto unlock; 1296 } 1297 1298 m_rt = sdw_alloc_master_rt(bus, stream_config, stream); 1299 if (!m_rt) { 1300 dev_err(bus->dev, 1301 "Master runtime config failed for stream:%s\n", 1302 stream->name); 1303 ret = -ENOMEM; 1304 goto unlock; 1305 } 1306 1307 ret = sdw_config_stream(bus->dev, stream, stream_config, false); 1308 if (ret) 1309 goto stream_error; 1310 1311 ret = sdw_master_port_config(bus, m_rt, port_config, num_ports); 1312 if (ret) 1313 goto stream_error; 1314 1315 stream->m_rt_count++; 1316 1317 goto unlock; 1318 1319 stream_error: 1320 sdw_release_master_stream(m_rt, stream); 1321 unlock: 1322 mutex_unlock(&bus->bus_lock); 1323 return ret; 1324 } 1325 EXPORT_SYMBOL(sdw_stream_add_master); 1326 1327 /** 1328 * sdw_stream_add_slave() - Allocate and add master/slave runtime to a stream 1329 * 1330 * @slave: SDW Slave instance 1331 * @stream_config: Stream configuration for audio stream 1332 * @stream: SoundWire stream 1333 * @port_config: Port configuration for audio stream 1334 * @num_ports: Number of ports 1335 * 1336 * It is expected that Slave is added before adding Master 1337 * to the Stream. 1338 * 1339 */ 1340 int sdw_stream_add_slave(struct sdw_slave *slave, 1341 struct sdw_stream_config *stream_config, 1342 struct sdw_port_config *port_config, 1343 unsigned int num_ports, 1344 struct sdw_stream_runtime *stream) 1345 { 1346 struct sdw_slave_runtime *s_rt; 1347 struct sdw_master_runtime *m_rt; 1348 int ret; 1349 1350 mutex_lock(&slave->bus->bus_lock); 1351 1352 /* 1353 * If this API is invoked by Slave first then m_rt is not valid. 1354 * So, allocate m_rt and add Slave to it. 1355 */ 1356 m_rt = sdw_alloc_master_rt(slave->bus, stream_config, stream); 1357 if (!m_rt) { 1358 dev_err(&slave->dev, 1359 "alloc master runtime failed for stream:%s\n", 1360 stream->name); 1361 ret = -ENOMEM; 1362 goto error; 1363 } 1364 1365 s_rt = sdw_alloc_slave_rt(slave, stream_config, stream); 1366 if (!s_rt) { 1367 dev_err(&slave->dev, 1368 "Slave runtime config failed for stream:%s\n", 1369 stream->name); 1370 ret = -ENOMEM; 1371 goto stream_error; 1372 } 1373 1374 ret = sdw_config_stream(&slave->dev, stream, stream_config, true); 1375 if (ret) 1376 goto stream_error; 1377 1378 list_add_tail(&s_rt->m_rt_node, &m_rt->slave_rt_list); 1379 1380 ret = sdw_slave_port_config(slave, s_rt, port_config, num_ports); 1381 if (ret) 1382 goto stream_error; 1383 1384 /* 1385 * Change stream state to CONFIGURED on first Slave add. 1386 * Bus is not aware of number of Slave(s) in a stream at this 1387 * point so cannot depend on all Slave(s) to be added in order to 1388 * change stream state to CONFIGURED. 1389 */ 1390 stream->state = SDW_STREAM_CONFIGURED; 1391 goto error; 1392 1393 stream_error: 1394 /* 1395 * we hit error so cleanup the stream, release all Slave(s) and 1396 * Master runtime 1397 */ 1398 sdw_release_master_stream(m_rt, stream); 1399 error: 1400 mutex_unlock(&slave->bus->bus_lock); 1401 return ret; 1402 } 1403 EXPORT_SYMBOL(sdw_stream_add_slave); 1404 1405 /** 1406 * sdw_get_slave_dpn_prop() - Get Slave port capabilities 1407 * 1408 * @slave: Slave handle 1409 * @direction: Data direction. 1410 * @port_num: Port number 1411 */ 1412 struct sdw_dpn_prop *sdw_get_slave_dpn_prop(struct sdw_slave *slave, 1413 enum sdw_data_direction direction, 1414 unsigned int port_num) 1415 { 1416 struct sdw_dpn_prop *dpn_prop; 1417 u8 num_ports; 1418 int i; 1419 1420 if (direction == SDW_DATA_DIR_TX) { 1421 num_ports = hweight32(slave->prop.source_ports); 1422 dpn_prop = slave->prop.src_dpn_prop; 1423 } else { 1424 num_ports = hweight32(slave->prop.sink_ports); 1425 dpn_prop = slave->prop.sink_dpn_prop; 1426 } 1427 1428 for (i = 0; i < num_ports; i++) { 1429 if (dpn_prop[i].num == port_num) 1430 return &dpn_prop[i]; 1431 } 1432 1433 return NULL; 1434 } 1435 1436 /** 1437 * sdw_acquire_bus_lock: Acquire bus lock for all Master runtime(s) 1438 * 1439 * @stream: SoundWire stream 1440 * 1441 * Acquire bus_lock for each of the master runtime(m_rt) part of this 1442 * stream to reconfigure the bus. 1443 * NOTE: This function is called from SoundWire stream ops and is 1444 * expected that a global lock is held before acquiring bus_lock. 1445 */ 1446 static void sdw_acquire_bus_lock(struct sdw_stream_runtime *stream) 1447 { 1448 struct sdw_master_runtime *m_rt; 1449 struct sdw_bus *bus = NULL; 1450 1451 /* Iterate for all Master(s) in Master list */ 1452 list_for_each_entry(m_rt, &stream->master_list, stream_node) { 1453 bus = m_rt->bus; 1454 1455 mutex_lock(&bus->bus_lock); 1456 } 1457 } 1458 1459 /** 1460 * sdw_release_bus_lock: Release bus lock for all Master runtime(s) 1461 * 1462 * @stream: SoundWire stream 1463 * 1464 * Release the previously held bus_lock after reconfiguring the bus. 1465 * NOTE: This function is called from SoundWire stream ops and is 1466 * expected that a global lock is held before releasing bus_lock. 1467 */ 1468 static void sdw_release_bus_lock(struct sdw_stream_runtime *stream) 1469 { 1470 struct sdw_master_runtime *m_rt = NULL; 1471 struct sdw_bus *bus = NULL; 1472 1473 /* Iterate for all Master(s) in Master list */ 1474 list_for_each_entry_reverse(m_rt, &stream->master_list, stream_node) { 1475 bus = m_rt->bus; 1476 mutex_unlock(&bus->bus_lock); 1477 } 1478 } 1479 1480 static int _sdw_prepare_stream(struct sdw_stream_runtime *stream, 1481 bool update_params) 1482 { 1483 struct sdw_master_runtime *m_rt; 1484 struct sdw_bus *bus = NULL; 1485 struct sdw_master_prop *prop; 1486 struct sdw_bus_params params; 1487 int ret; 1488 1489 /* Prepare Master(s) and Slave(s) port(s) associated with stream */ 1490 list_for_each_entry(m_rt, &stream->master_list, stream_node) { 1491 bus = m_rt->bus; 1492 prop = &bus->prop; 1493 memcpy(¶ms, &bus->params, sizeof(params)); 1494 1495 /* TODO: Support Asynchronous mode */ 1496 if ((prop->max_clk_freq % stream->params.rate) != 0) { 1497 dev_err(bus->dev, "Async mode not supported\n"); 1498 return -EINVAL; 1499 } 1500 1501 if (!update_params) 1502 goto program_params; 1503 1504 /* Increment cumulative bus bandwidth */ 1505 /* TODO: Update this during Device-Device support */ 1506 bus->params.bandwidth += m_rt->stream->params.rate * 1507 m_rt->ch_count * m_rt->stream->params.bps; 1508 1509 /* Compute params */ 1510 if (bus->compute_params) { 1511 ret = bus->compute_params(bus); 1512 if (ret < 0) { 1513 dev_err(bus->dev, "Compute params failed: %d", 1514 ret); 1515 return ret; 1516 } 1517 } 1518 1519 program_params: 1520 /* Program params */ 1521 ret = sdw_program_params(bus, true); 1522 if (ret < 0) { 1523 dev_err(bus->dev, "Program params failed: %d\n", ret); 1524 goto restore_params; 1525 } 1526 } 1527 1528 if (!bus) { 1529 pr_err("Configuration error in %s\n", __func__); 1530 return -EINVAL; 1531 } 1532 1533 ret = do_bank_switch(stream); 1534 if (ret < 0) { 1535 dev_err(bus->dev, "Bank switch failed: %d\n", ret); 1536 goto restore_params; 1537 } 1538 1539 list_for_each_entry(m_rt, &stream->master_list, stream_node) { 1540 bus = m_rt->bus; 1541 1542 /* Prepare port(s) on the new clock configuration */ 1543 ret = sdw_prep_deprep_ports(m_rt, true); 1544 if (ret < 0) { 1545 dev_err(bus->dev, "Prepare port(s) failed ret = %d\n", 1546 ret); 1547 return ret; 1548 } 1549 } 1550 1551 stream->state = SDW_STREAM_PREPARED; 1552 1553 return ret; 1554 1555 restore_params: 1556 memcpy(&bus->params, ¶ms, sizeof(params)); 1557 return ret; 1558 } 1559 1560 /** 1561 * sdw_prepare_stream() - Prepare SoundWire stream 1562 * 1563 * @stream: Soundwire stream 1564 * 1565 * Documentation/driver-api/soundwire/stream.rst explains this API in detail 1566 */ 1567 int sdw_prepare_stream(struct sdw_stream_runtime *stream) 1568 { 1569 bool update_params = true; 1570 int ret; 1571 1572 if (!stream) { 1573 pr_err("SoundWire: Handle not found for stream\n"); 1574 return -EINVAL; 1575 } 1576 1577 sdw_acquire_bus_lock(stream); 1578 1579 if (stream->state == SDW_STREAM_PREPARED) { 1580 ret = 0; 1581 goto state_err; 1582 } 1583 1584 if (stream->state != SDW_STREAM_CONFIGURED && 1585 stream->state != SDW_STREAM_DEPREPARED && 1586 stream->state != SDW_STREAM_DISABLED) { 1587 pr_err("%s: %s: inconsistent state state %d\n", 1588 __func__, stream->name, stream->state); 1589 ret = -EINVAL; 1590 goto state_err; 1591 } 1592 1593 /* 1594 * when the stream is DISABLED, this means sdw_prepare_stream() 1595 * is called as a result of an underflow or a resume operation. 1596 * In this case, the bus parameters shall not be recomputed, but 1597 * still need to be re-applied 1598 */ 1599 if (stream->state == SDW_STREAM_DISABLED) 1600 update_params = false; 1601 1602 ret = _sdw_prepare_stream(stream, update_params); 1603 1604 state_err: 1605 sdw_release_bus_lock(stream); 1606 return ret; 1607 } 1608 EXPORT_SYMBOL(sdw_prepare_stream); 1609 1610 static int _sdw_enable_stream(struct sdw_stream_runtime *stream) 1611 { 1612 struct sdw_master_runtime *m_rt; 1613 struct sdw_bus *bus = NULL; 1614 int ret; 1615 1616 /* Enable Master(s) and Slave(s) port(s) associated with stream */ 1617 list_for_each_entry(m_rt, &stream->master_list, stream_node) { 1618 bus = m_rt->bus; 1619 1620 /* Program params */ 1621 ret = sdw_program_params(bus, false); 1622 if (ret < 0) { 1623 dev_err(bus->dev, "Program params failed: %d\n", ret); 1624 return ret; 1625 } 1626 1627 /* Enable port(s) */ 1628 ret = sdw_enable_disable_ports(m_rt, true); 1629 if (ret < 0) { 1630 dev_err(bus->dev, 1631 "Enable port(s) failed ret: %d\n", ret); 1632 return ret; 1633 } 1634 } 1635 1636 if (!bus) { 1637 pr_err("Configuration error in %s\n", __func__); 1638 return -EINVAL; 1639 } 1640 1641 ret = do_bank_switch(stream); 1642 if (ret < 0) { 1643 dev_err(bus->dev, "Bank switch failed: %d\n", ret); 1644 return ret; 1645 } 1646 1647 stream->state = SDW_STREAM_ENABLED; 1648 return 0; 1649 } 1650 1651 /** 1652 * sdw_enable_stream() - Enable SoundWire stream 1653 * 1654 * @stream: Soundwire stream 1655 * 1656 * Documentation/driver-api/soundwire/stream.rst explains this API in detail 1657 */ 1658 int sdw_enable_stream(struct sdw_stream_runtime *stream) 1659 { 1660 int ret; 1661 1662 if (!stream) { 1663 pr_err("SoundWire: Handle not found for stream\n"); 1664 return -EINVAL; 1665 } 1666 1667 sdw_acquire_bus_lock(stream); 1668 1669 if (stream->state != SDW_STREAM_PREPARED && 1670 stream->state != SDW_STREAM_DISABLED) { 1671 pr_err("%s: %s: inconsistent state state %d\n", 1672 __func__, stream->name, stream->state); 1673 ret = -EINVAL; 1674 goto state_err; 1675 } 1676 1677 ret = _sdw_enable_stream(stream); 1678 1679 state_err: 1680 sdw_release_bus_lock(stream); 1681 return ret; 1682 } 1683 EXPORT_SYMBOL(sdw_enable_stream); 1684 1685 static int _sdw_disable_stream(struct sdw_stream_runtime *stream) 1686 { 1687 struct sdw_master_runtime *m_rt; 1688 int ret; 1689 1690 list_for_each_entry(m_rt, &stream->master_list, stream_node) { 1691 struct sdw_bus *bus = m_rt->bus; 1692 1693 /* Disable port(s) */ 1694 ret = sdw_enable_disable_ports(m_rt, false); 1695 if (ret < 0) { 1696 dev_err(bus->dev, "Disable port(s) failed: %d\n", ret); 1697 return ret; 1698 } 1699 } 1700 stream->state = SDW_STREAM_DISABLED; 1701 1702 list_for_each_entry(m_rt, &stream->master_list, stream_node) { 1703 struct sdw_bus *bus = m_rt->bus; 1704 1705 /* Program params */ 1706 ret = sdw_program_params(bus, false); 1707 if (ret < 0) { 1708 dev_err(bus->dev, "Program params failed: %d\n", ret); 1709 return ret; 1710 } 1711 } 1712 1713 ret = do_bank_switch(stream); 1714 if (ret < 0) { 1715 pr_err("Bank switch failed: %d\n", ret); 1716 return ret; 1717 } 1718 1719 /* make sure alternate bank (previous current) is also disabled */ 1720 list_for_each_entry(m_rt, &stream->master_list, stream_node) { 1721 struct sdw_bus *bus = m_rt->bus; 1722 1723 /* Disable port(s) */ 1724 ret = sdw_enable_disable_ports(m_rt, false); 1725 if (ret < 0) { 1726 dev_err(bus->dev, "Disable port(s) failed: %d\n", ret); 1727 return ret; 1728 } 1729 } 1730 1731 return 0; 1732 } 1733 1734 /** 1735 * sdw_disable_stream() - Disable SoundWire stream 1736 * 1737 * @stream: Soundwire stream 1738 * 1739 * Documentation/driver-api/soundwire/stream.rst explains this API in detail 1740 */ 1741 int sdw_disable_stream(struct sdw_stream_runtime *stream) 1742 { 1743 int ret; 1744 1745 if (!stream) { 1746 pr_err("SoundWire: Handle not found for stream\n"); 1747 return -EINVAL; 1748 } 1749 1750 sdw_acquire_bus_lock(stream); 1751 1752 if (stream->state != SDW_STREAM_ENABLED) { 1753 pr_err("%s: %s: inconsistent state state %d\n", 1754 __func__, stream->name, stream->state); 1755 ret = -EINVAL; 1756 goto state_err; 1757 } 1758 1759 ret = _sdw_disable_stream(stream); 1760 1761 state_err: 1762 sdw_release_bus_lock(stream); 1763 return ret; 1764 } 1765 EXPORT_SYMBOL(sdw_disable_stream); 1766 1767 static int _sdw_deprepare_stream(struct sdw_stream_runtime *stream) 1768 { 1769 struct sdw_master_runtime *m_rt; 1770 struct sdw_bus *bus; 1771 int ret = 0; 1772 1773 list_for_each_entry(m_rt, &stream->master_list, stream_node) { 1774 bus = m_rt->bus; 1775 /* De-prepare port(s) */ 1776 ret = sdw_prep_deprep_ports(m_rt, false); 1777 if (ret < 0) { 1778 dev_err(bus->dev, 1779 "De-prepare port(s) failed: %d\n", ret); 1780 return ret; 1781 } 1782 1783 /* TODO: Update this during Device-Device support */ 1784 bus->params.bandwidth -= m_rt->stream->params.rate * 1785 m_rt->ch_count * m_rt->stream->params.bps; 1786 1787 /* Compute params */ 1788 if (bus->compute_params) { 1789 ret = bus->compute_params(bus); 1790 if (ret < 0) { 1791 dev_err(bus->dev, "Compute params failed: %d", 1792 ret); 1793 return ret; 1794 } 1795 } 1796 1797 /* Program params */ 1798 ret = sdw_program_params(bus, false); 1799 if (ret < 0) { 1800 dev_err(bus->dev, "Program params failed: %d\n", ret); 1801 return ret; 1802 } 1803 } 1804 1805 stream->state = SDW_STREAM_DEPREPARED; 1806 return do_bank_switch(stream); 1807 } 1808 1809 /** 1810 * sdw_deprepare_stream() - Deprepare SoundWire stream 1811 * 1812 * @stream: Soundwire stream 1813 * 1814 * Documentation/driver-api/soundwire/stream.rst explains this API in detail 1815 */ 1816 int sdw_deprepare_stream(struct sdw_stream_runtime *stream) 1817 { 1818 int ret; 1819 1820 if (!stream) { 1821 pr_err("SoundWire: Handle not found for stream\n"); 1822 return -EINVAL; 1823 } 1824 1825 sdw_acquire_bus_lock(stream); 1826 1827 if (stream->state != SDW_STREAM_PREPARED && 1828 stream->state != SDW_STREAM_DISABLED) { 1829 pr_err("%s: %s: inconsistent state state %d\n", 1830 __func__, stream->name, stream->state); 1831 ret = -EINVAL; 1832 goto state_err; 1833 } 1834 1835 ret = _sdw_deprepare_stream(stream); 1836 1837 state_err: 1838 sdw_release_bus_lock(stream); 1839 return ret; 1840 } 1841 EXPORT_SYMBOL(sdw_deprepare_stream); 1842 1843 static int set_stream(struct snd_pcm_substream *substream, 1844 struct sdw_stream_runtime *sdw_stream) 1845 { 1846 struct snd_soc_pcm_runtime *rtd = substream->private_data; 1847 struct snd_soc_dai *dai; 1848 int ret = 0; 1849 int i; 1850 1851 /* Set stream pointer on all DAIs */ 1852 for_each_rtd_dais(rtd, i, dai) { 1853 ret = snd_soc_dai_set_sdw_stream(dai, sdw_stream, substream->stream); 1854 if (ret < 0) { 1855 dev_err(rtd->dev, "failed to set stream pointer on dai %s", dai->name); 1856 break; 1857 } 1858 } 1859 1860 return ret; 1861 } 1862 1863 /** 1864 * sdw_startup_stream() - Startup SoundWire stream 1865 * 1866 * @sdw_substream: Soundwire stream 1867 * 1868 * Documentation/driver-api/soundwire/stream.rst explains this API in detail 1869 */ 1870 int sdw_startup_stream(void *sdw_substream) 1871 { 1872 struct snd_pcm_substream *substream = sdw_substream; 1873 struct snd_soc_pcm_runtime *rtd = substream->private_data; 1874 struct sdw_stream_runtime *sdw_stream; 1875 char *name; 1876 int ret; 1877 1878 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) 1879 name = kasprintf(GFP_KERNEL, "%s-Playback", substream->name); 1880 else 1881 name = kasprintf(GFP_KERNEL, "%s-Capture", substream->name); 1882 1883 if (!name) 1884 return -ENOMEM; 1885 1886 sdw_stream = sdw_alloc_stream(name); 1887 if (!sdw_stream) { 1888 dev_err(rtd->dev, "alloc stream failed for substream DAI %s", substream->name); 1889 ret = -ENOMEM; 1890 goto error; 1891 } 1892 1893 ret = set_stream(substream, sdw_stream); 1894 if (ret < 0) 1895 goto release_stream; 1896 return 0; 1897 1898 release_stream: 1899 sdw_release_stream(sdw_stream); 1900 set_stream(substream, NULL); 1901 error: 1902 kfree(name); 1903 return ret; 1904 } 1905 EXPORT_SYMBOL(sdw_startup_stream); 1906 1907 /** 1908 * sdw_shutdown_stream() - Shutdown SoundWire stream 1909 * 1910 * @sdw_substream: Soundwire stream 1911 * 1912 * Documentation/driver-api/soundwire/stream.rst explains this API in detail 1913 */ 1914 void sdw_shutdown_stream(void *sdw_substream) 1915 { 1916 struct snd_pcm_substream *substream = sdw_substream; 1917 struct snd_soc_pcm_runtime *rtd = substream->private_data; 1918 struct sdw_stream_runtime *sdw_stream; 1919 struct snd_soc_dai *dai; 1920 1921 /* Find stream from first CPU DAI */ 1922 dai = asoc_rtd_to_cpu(rtd, 0); 1923 1924 sdw_stream = snd_soc_dai_get_sdw_stream(dai, substream->stream); 1925 1926 if (IS_ERR(sdw_stream)) { 1927 dev_err(rtd->dev, "no stream found for DAI %s", dai->name); 1928 return; 1929 } 1930 1931 /* release memory */ 1932 kfree(sdw_stream->name); 1933 sdw_release_stream(sdw_stream); 1934 1935 /* clear DAI data */ 1936 set_stream(substream, NULL); 1937 } 1938 EXPORT_SYMBOL(sdw_shutdown_stream); 1939