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