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 if (s_rt->slave->is_mockup_device) 137 return 0; 138 139 dpn_prop = sdw_get_slave_dpn_prop(s_rt->slave, 140 s_rt->direction, 141 t_params->port_num); 142 if (!dpn_prop) 143 return -EINVAL; 144 145 addr1 = SDW_DPN_PORTCTRL(t_params->port_num); 146 addr2 = SDW_DPN_BLOCKCTRL1(t_params->port_num); 147 148 if (bus->params.next_bank) { 149 addr3 = SDW_DPN_SAMPLECTRL1_B1(t_params->port_num); 150 addr4 = SDW_DPN_OFFSETCTRL1_B1(t_params->port_num); 151 addr5 = SDW_DPN_BLOCKCTRL2_B1(t_params->port_num); 152 addr6 = SDW_DPN_LANECTRL_B1(t_params->port_num); 153 154 } else { 155 addr3 = SDW_DPN_SAMPLECTRL1_B0(t_params->port_num); 156 addr4 = SDW_DPN_OFFSETCTRL1_B0(t_params->port_num); 157 addr5 = SDW_DPN_BLOCKCTRL2_B0(t_params->port_num); 158 addr6 = SDW_DPN_LANECTRL_B0(t_params->port_num); 159 } 160 161 /* Program DPN_PortCtrl register */ 162 wbuf = FIELD_PREP(SDW_DPN_PORTCTRL_DATAMODE, p_params->data_mode); 163 wbuf |= FIELD_PREP(SDW_DPN_PORTCTRL_FLOWMODE, p_params->flow_mode); 164 165 ret = sdw_update(s_rt->slave, addr1, 0xF, wbuf); 166 if (ret < 0) { 167 dev_err(&s_rt->slave->dev, 168 "DPN_PortCtrl register write failed for port %d\n", 169 t_params->port_num); 170 return ret; 171 } 172 173 if (!dpn_prop->read_only_wordlength) { 174 /* Program DPN_BlockCtrl1 register */ 175 ret = sdw_write(s_rt->slave, addr2, (p_params->bps - 1)); 176 if (ret < 0) { 177 dev_err(&s_rt->slave->dev, 178 "DPN_BlockCtrl1 register write failed for port %d\n", 179 t_params->port_num); 180 return ret; 181 } 182 } 183 184 /* Program DPN_SampleCtrl1 register */ 185 wbuf = (t_params->sample_interval - 1) & SDW_DPN_SAMPLECTRL_LOW; 186 ret = sdw_write(s_rt->slave, addr3, wbuf); 187 if (ret < 0) { 188 dev_err(&s_rt->slave->dev, 189 "DPN_SampleCtrl1 register write failed for port %d\n", 190 t_params->port_num); 191 return ret; 192 } 193 194 /* Program DPN_OffsetCtrl1 registers */ 195 ret = sdw_write(s_rt->slave, addr4, t_params->offset1); 196 if (ret < 0) { 197 dev_err(&s_rt->slave->dev, 198 "DPN_OffsetCtrl1 register write failed for port %d\n", 199 t_params->port_num); 200 return ret; 201 } 202 203 /* Program DPN_BlockCtrl2 register*/ 204 if (t_params->blk_grp_ctrl_valid) { 205 ret = sdw_write(s_rt->slave, addr5, t_params->blk_grp_ctrl); 206 if (ret < 0) { 207 dev_err(&s_rt->slave->dev, 208 "DPN_BlockCtrl2 reg write failed for port %d\n", 209 t_params->port_num); 210 return ret; 211 } 212 } 213 214 /* program DPN_LaneCtrl register */ 215 if (slave_prop->lane_control_support) { 216 ret = sdw_write(s_rt->slave, addr6, t_params->lane_ctrl); 217 if (ret < 0) { 218 dev_err(&s_rt->slave->dev, 219 "DPN_LaneCtrl register write failed for port %d\n", 220 t_params->port_num); 221 return ret; 222 } 223 } 224 225 if (dpn_prop->type != SDW_DPN_SIMPLE) { 226 ret = _sdw_program_slave_port_params(bus, s_rt->slave, 227 t_params, dpn_prop->type); 228 if (ret < 0) 229 dev_err(&s_rt->slave->dev, 230 "Transport reg write failed for port: %d\n", 231 t_params->port_num); 232 } 233 234 return ret; 235 } 236 237 static int sdw_program_master_port_params(struct sdw_bus *bus, 238 struct sdw_port_runtime *p_rt) 239 { 240 int ret; 241 242 /* 243 * we need to set transport and port parameters for the port. 244 * Transport parameters refers to the sample interval, offsets and 245 * hstart/stop etc of the data. Port parameters refers to word 246 * length, flow mode etc of the port 247 */ 248 ret = bus->port_ops->dpn_set_port_transport_params(bus, 249 &p_rt->transport_params, 250 bus->params.next_bank); 251 if (ret < 0) 252 return ret; 253 254 return bus->port_ops->dpn_set_port_params(bus, 255 &p_rt->port_params, 256 bus->params.next_bank); 257 } 258 259 /** 260 * sdw_program_port_params() - Programs transport parameters of Master(s) 261 * and Slave(s) 262 * 263 * @m_rt: Master stream runtime 264 */ 265 static int sdw_program_port_params(struct sdw_master_runtime *m_rt) 266 { 267 struct sdw_slave_runtime *s_rt; 268 struct sdw_bus *bus = m_rt->bus; 269 struct sdw_port_runtime *p_rt; 270 int ret = 0; 271 272 /* Program transport & port parameters for Slave(s) */ 273 list_for_each_entry(s_rt, &m_rt->slave_rt_list, m_rt_node) { 274 list_for_each_entry(p_rt, &s_rt->port_list, port_node) { 275 ret = sdw_program_slave_port_params(bus, s_rt, p_rt); 276 if (ret < 0) 277 return ret; 278 } 279 } 280 281 /* Program transport & port parameters for Master(s) */ 282 list_for_each_entry(p_rt, &m_rt->port_list, port_node) { 283 ret = sdw_program_master_port_params(bus, p_rt); 284 if (ret < 0) 285 return ret; 286 } 287 288 return 0; 289 } 290 291 /** 292 * sdw_enable_disable_slave_ports: Enable/disable slave data port 293 * 294 * @bus: bus instance 295 * @s_rt: slave runtime 296 * @p_rt: port runtime 297 * @en: enable or disable operation 298 * 299 * This function only sets the enable/disable bits in the relevant bank, the 300 * actual enable/disable is done with a bank switch 301 */ 302 static int sdw_enable_disable_slave_ports(struct sdw_bus *bus, 303 struct sdw_slave_runtime *s_rt, 304 struct sdw_port_runtime *p_rt, 305 bool en) 306 { 307 struct sdw_transport_params *t_params = &p_rt->transport_params; 308 u32 addr; 309 int ret; 310 311 if (bus->params.next_bank) 312 addr = SDW_DPN_CHANNELEN_B1(p_rt->num); 313 else 314 addr = SDW_DPN_CHANNELEN_B0(p_rt->num); 315 316 /* 317 * Since bus doesn't support sharing a port across two streams, 318 * it is safe to reset this register 319 */ 320 if (en) 321 ret = sdw_write(s_rt->slave, addr, p_rt->ch_mask); 322 else 323 ret = sdw_write(s_rt->slave, addr, 0x0); 324 325 if (ret < 0) 326 dev_err(&s_rt->slave->dev, 327 "Slave chn_en reg write failed:%d port:%d\n", 328 ret, t_params->port_num); 329 330 return ret; 331 } 332 333 static int sdw_enable_disable_master_ports(struct sdw_master_runtime *m_rt, 334 struct sdw_port_runtime *p_rt, 335 bool en) 336 { 337 struct sdw_transport_params *t_params = &p_rt->transport_params; 338 struct sdw_bus *bus = m_rt->bus; 339 struct sdw_enable_ch enable_ch; 340 int ret; 341 342 enable_ch.port_num = p_rt->num; 343 enable_ch.ch_mask = p_rt->ch_mask; 344 enable_ch.enable = en; 345 346 /* Perform Master port channel(s) enable/disable */ 347 if (bus->port_ops->dpn_port_enable_ch) { 348 ret = bus->port_ops->dpn_port_enable_ch(bus, 349 &enable_ch, 350 bus->params.next_bank); 351 if (ret < 0) { 352 dev_err(bus->dev, 353 "Master chn_en write failed:%d port:%d\n", 354 ret, t_params->port_num); 355 return ret; 356 } 357 } else { 358 dev_err(bus->dev, 359 "dpn_port_enable_ch not supported, %s failed\n", 360 en ? "enable" : "disable"); 361 return -EINVAL; 362 } 363 364 return 0; 365 } 366 367 /** 368 * sdw_enable_disable_ports() - Enable/disable port(s) for Master and 369 * Slave(s) 370 * 371 * @m_rt: Master stream runtime 372 * @en: mode (enable/disable) 373 */ 374 static int sdw_enable_disable_ports(struct sdw_master_runtime *m_rt, bool en) 375 { 376 struct sdw_port_runtime *s_port, *m_port; 377 struct sdw_slave_runtime *s_rt; 378 int ret = 0; 379 380 /* Enable/Disable Slave port(s) */ 381 list_for_each_entry(s_rt, &m_rt->slave_rt_list, m_rt_node) { 382 list_for_each_entry(s_port, &s_rt->port_list, port_node) { 383 ret = sdw_enable_disable_slave_ports(m_rt->bus, s_rt, 384 s_port, en); 385 if (ret < 0) 386 return ret; 387 } 388 } 389 390 /* Enable/Disable Master port(s) */ 391 list_for_each_entry(m_port, &m_rt->port_list, port_node) { 392 ret = sdw_enable_disable_master_ports(m_rt, m_port, en); 393 if (ret < 0) 394 return ret; 395 } 396 397 return 0; 398 } 399 400 static int sdw_do_port_prep(struct sdw_slave_runtime *s_rt, 401 struct sdw_prepare_ch prep_ch, 402 enum sdw_port_prep_ops cmd) 403 { 404 const struct sdw_slave_ops *ops = s_rt->slave->ops; 405 int ret; 406 407 if (ops->port_prep) { 408 ret = ops->port_prep(s_rt->slave, &prep_ch, cmd); 409 if (ret < 0) { 410 dev_err(&s_rt->slave->dev, 411 "Slave Port Prep cmd %d failed: %d\n", 412 cmd, ret); 413 return ret; 414 } 415 } 416 417 return 0; 418 } 419 420 static int sdw_prep_deprep_slave_ports(struct sdw_bus *bus, 421 struct sdw_slave_runtime *s_rt, 422 struct sdw_port_runtime *p_rt, 423 bool prep) 424 { 425 struct completion *port_ready; 426 struct sdw_dpn_prop *dpn_prop; 427 struct sdw_prepare_ch prep_ch; 428 bool intr = false; 429 int ret = 0, val; 430 u32 addr; 431 432 prep_ch.num = p_rt->num; 433 prep_ch.ch_mask = p_rt->ch_mask; 434 435 dpn_prop = sdw_get_slave_dpn_prop(s_rt->slave, 436 s_rt->direction, 437 prep_ch.num); 438 if (!dpn_prop) { 439 dev_err(bus->dev, 440 "Slave Port:%d properties not found\n", prep_ch.num); 441 return -EINVAL; 442 } 443 444 prep_ch.prepare = prep; 445 446 prep_ch.bank = bus->params.next_bank; 447 448 if (dpn_prop->imp_def_interrupts || !dpn_prop->simple_ch_prep_sm || 449 bus->params.s_data_mode != SDW_PORT_DATA_MODE_NORMAL) 450 intr = true; 451 452 /* 453 * Enable interrupt before Port prepare. 454 * For Port de-prepare, it is assumed that port 455 * was prepared earlier 456 */ 457 if (prep && intr) { 458 ret = sdw_configure_dpn_intr(s_rt->slave, p_rt->num, prep, 459 dpn_prop->imp_def_interrupts); 460 if (ret < 0) 461 return ret; 462 } 463 464 /* Inform slave about the impending port prepare */ 465 sdw_do_port_prep(s_rt, prep_ch, SDW_OPS_PORT_PRE_PREP); 466 467 /* Prepare Slave port implementing CP_SM */ 468 if (!dpn_prop->simple_ch_prep_sm) { 469 addr = SDW_DPN_PREPARECTRL(p_rt->num); 470 471 if (prep) 472 ret = sdw_write(s_rt->slave, addr, p_rt->ch_mask); 473 else 474 ret = sdw_write(s_rt->slave, addr, 0x0); 475 476 if (ret < 0) { 477 dev_err(&s_rt->slave->dev, 478 "Slave prep_ctrl reg write failed\n"); 479 return ret; 480 } 481 482 /* Wait for completion on port ready */ 483 port_ready = &s_rt->slave->port_ready[prep_ch.num]; 484 wait_for_completion_timeout(port_ready, 485 msecs_to_jiffies(dpn_prop->ch_prep_timeout)); 486 487 val = sdw_read(s_rt->slave, SDW_DPN_PREPARESTATUS(p_rt->num)); 488 if ((val < 0) || (val & p_rt->ch_mask)) { 489 ret = (val < 0) ? val : -ETIMEDOUT; 490 dev_err(&s_rt->slave->dev, 491 "Chn prep failed for port %d: %d\n", prep_ch.num, ret); 492 return ret; 493 } 494 } 495 496 /* Inform slaves about ports prepared */ 497 sdw_do_port_prep(s_rt, prep_ch, SDW_OPS_PORT_POST_PREP); 498 499 /* Disable interrupt after Port de-prepare */ 500 if (!prep && intr) 501 ret = sdw_configure_dpn_intr(s_rt->slave, p_rt->num, prep, 502 dpn_prop->imp_def_interrupts); 503 504 return ret; 505 } 506 507 static int sdw_prep_deprep_master_ports(struct sdw_master_runtime *m_rt, 508 struct sdw_port_runtime *p_rt, 509 bool prep) 510 { 511 struct sdw_transport_params *t_params = &p_rt->transport_params; 512 struct sdw_bus *bus = m_rt->bus; 513 const struct sdw_master_port_ops *ops = bus->port_ops; 514 struct sdw_prepare_ch prep_ch; 515 int ret = 0; 516 517 prep_ch.num = p_rt->num; 518 prep_ch.ch_mask = p_rt->ch_mask; 519 prep_ch.prepare = prep; /* Prepare/De-prepare */ 520 prep_ch.bank = bus->params.next_bank; 521 522 /* Pre-prepare/Pre-deprepare port(s) */ 523 if (ops->dpn_port_prep) { 524 ret = ops->dpn_port_prep(bus, &prep_ch); 525 if (ret < 0) { 526 dev_err(bus->dev, "Port prepare failed for port:%d\n", 527 t_params->port_num); 528 return ret; 529 } 530 } 531 532 return ret; 533 } 534 535 /** 536 * sdw_prep_deprep_ports() - Prepare/De-prepare port(s) for Master(s) and 537 * Slave(s) 538 * 539 * @m_rt: Master runtime handle 540 * @prep: Prepare or De-prepare 541 */ 542 static int sdw_prep_deprep_ports(struct sdw_master_runtime *m_rt, bool prep) 543 { 544 struct sdw_slave_runtime *s_rt; 545 struct sdw_port_runtime *p_rt; 546 int ret = 0; 547 548 /* Prepare/De-prepare Slave port(s) */ 549 list_for_each_entry(s_rt, &m_rt->slave_rt_list, m_rt_node) { 550 list_for_each_entry(p_rt, &s_rt->port_list, port_node) { 551 ret = sdw_prep_deprep_slave_ports(m_rt->bus, s_rt, 552 p_rt, prep); 553 if (ret < 0) 554 return ret; 555 } 556 } 557 558 /* Prepare/De-prepare Master port(s) */ 559 list_for_each_entry(p_rt, &m_rt->port_list, port_node) { 560 ret = sdw_prep_deprep_master_ports(m_rt, p_rt, prep); 561 if (ret < 0) 562 return ret; 563 } 564 565 return ret; 566 } 567 568 /** 569 * sdw_notify_config() - Notify bus configuration 570 * 571 * @m_rt: Master runtime handle 572 * 573 * This function notifies the Master(s) and Slave(s) of the 574 * new bus configuration. 575 */ 576 static int sdw_notify_config(struct sdw_master_runtime *m_rt) 577 { 578 struct sdw_slave_runtime *s_rt; 579 struct sdw_bus *bus = m_rt->bus; 580 struct sdw_slave *slave; 581 int ret = 0; 582 583 if (bus->ops->set_bus_conf) { 584 ret = bus->ops->set_bus_conf(bus, &bus->params); 585 if (ret < 0) 586 return ret; 587 } 588 589 list_for_each_entry(s_rt, &m_rt->slave_rt_list, m_rt_node) { 590 slave = s_rt->slave; 591 592 if (slave->ops->bus_config) { 593 ret = slave->ops->bus_config(slave, &bus->params); 594 if (ret < 0) { 595 dev_err(bus->dev, "Notify Slave: %d failed\n", 596 slave->dev_num); 597 return ret; 598 } 599 } 600 } 601 602 return ret; 603 } 604 605 /** 606 * sdw_program_params() - Program transport and port parameters for Master(s) 607 * and Slave(s) 608 * 609 * @bus: SDW bus instance 610 * @prepare: true if sdw_program_params() is called by _prepare. 611 */ 612 static int sdw_program_params(struct sdw_bus *bus, bool prepare) 613 { 614 struct sdw_master_runtime *m_rt; 615 int ret = 0; 616 617 list_for_each_entry(m_rt, &bus->m_rt_list, bus_node) { 618 619 /* 620 * this loop walks through all master runtimes for a 621 * bus, but the ports can only be configured while 622 * explicitly preparing a stream or handling an 623 * already-prepared stream otherwise. 624 */ 625 if (!prepare && 626 m_rt->stream->state == SDW_STREAM_CONFIGURED) 627 continue; 628 629 ret = sdw_program_port_params(m_rt); 630 if (ret < 0) { 631 dev_err(bus->dev, 632 "Program transport params failed: %d\n", ret); 633 return ret; 634 } 635 636 ret = sdw_notify_config(m_rt); 637 if (ret < 0) { 638 dev_err(bus->dev, 639 "Notify bus config failed: %d\n", ret); 640 return ret; 641 } 642 643 /* Enable port(s) on alternate bank for all active streams */ 644 if (m_rt->stream->state != SDW_STREAM_ENABLED) 645 continue; 646 647 ret = sdw_enable_disable_ports(m_rt, true); 648 if (ret < 0) { 649 dev_err(bus->dev, "Enable channel failed: %d\n", ret); 650 return ret; 651 } 652 } 653 654 return ret; 655 } 656 657 static int sdw_bank_switch(struct sdw_bus *bus, int m_rt_count) 658 { 659 int col_index, row_index; 660 bool multi_link; 661 struct sdw_msg *wr_msg; 662 u8 *wbuf; 663 int ret; 664 u16 addr; 665 666 wr_msg = kzalloc(sizeof(*wr_msg), GFP_KERNEL); 667 if (!wr_msg) 668 return -ENOMEM; 669 670 bus->defer_msg.msg = wr_msg; 671 672 wbuf = kzalloc(sizeof(*wbuf), GFP_KERNEL); 673 if (!wbuf) { 674 ret = -ENOMEM; 675 goto error_1; 676 } 677 678 /* Get row and column index to program register */ 679 col_index = sdw_find_col_index(bus->params.col); 680 row_index = sdw_find_row_index(bus->params.row); 681 wbuf[0] = col_index | (row_index << 3); 682 683 if (bus->params.next_bank) 684 addr = SDW_SCP_FRAMECTRL_B1; 685 else 686 addr = SDW_SCP_FRAMECTRL_B0; 687 688 sdw_fill_msg(wr_msg, NULL, addr, 1, SDW_BROADCAST_DEV_NUM, 689 SDW_MSG_FLAG_WRITE, wbuf); 690 wr_msg->ssp_sync = true; 691 692 /* 693 * Set the multi_link flag only when both the hardware supports 694 * and hardware-based sync is required 695 */ 696 multi_link = bus->multi_link && (m_rt_count >= bus->hw_sync_min_links); 697 698 if (multi_link) 699 ret = sdw_transfer_defer(bus, wr_msg, &bus->defer_msg); 700 else 701 ret = sdw_transfer(bus, wr_msg); 702 703 if (ret < 0 && ret != -ENODATA) { 704 dev_err(bus->dev, "Slave frame_ctrl reg write failed\n"); 705 goto error; 706 } 707 708 if (!multi_link) { 709 kfree(wr_msg); 710 kfree(wbuf); 711 bus->defer_msg.msg = NULL; 712 bus->params.curr_bank = !bus->params.curr_bank; 713 bus->params.next_bank = !bus->params.next_bank; 714 } 715 716 return 0; 717 718 error: 719 kfree(wbuf); 720 error_1: 721 kfree(wr_msg); 722 bus->defer_msg.msg = NULL; 723 return ret; 724 } 725 726 /** 727 * sdw_ml_sync_bank_switch: Multilink register bank switch 728 * 729 * @bus: SDW bus instance 730 * 731 * Caller function should free the buffers on error 732 */ 733 static int sdw_ml_sync_bank_switch(struct sdw_bus *bus) 734 { 735 unsigned long time_left; 736 737 if (!bus->multi_link) 738 return 0; 739 740 /* Wait for completion of transfer */ 741 time_left = wait_for_completion_timeout(&bus->defer_msg.complete, 742 bus->bank_switch_timeout); 743 744 if (!time_left) { 745 dev_err(bus->dev, "Controller Timed out on bank switch\n"); 746 return -ETIMEDOUT; 747 } 748 749 bus->params.curr_bank = !bus->params.curr_bank; 750 bus->params.next_bank = !bus->params.next_bank; 751 752 if (bus->defer_msg.msg) { 753 kfree(bus->defer_msg.msg->buf); 754 kfree(bus->defer_msg.msg); 755 } 756 757 return 0; 758 } 759 760 static int do_bank_switch(struct sdw_stream_runtime *stream) 761 { 762 struct sdw_master_runtime *m_rt; 763 const struct sdw_master_ops *ops; 764 struct sdw_bus *bus; 765 bool multi_link = false; 766 int m_rt_count; 767 int ret = 0; 768 769 m_rt_count = stream->m_rt_count; 770 771 list_for_each_entry(m_rt, &stream->master_list, stream_node) { 772 bus = m_rt->bus; 773 ops = bus->ops; 774 775 if (bus->multi_link && m_rt_count >= bus->hw_sync_min_links) { 776 multi_link = true; 777 mutex_lock(&bus->msg_lock); 778 } 779 780 /* Pre-bank switch */ 781 if (ops->pre_bank_switch) { 782 ret = ops->pre_bank_switch(bus); 783 if (ret < 0) { 784 dev_err(bus->dev, 785 "Pre bank switch op failed: %d\n", ret); 786 goto msg_unlock; 787 } 788 } 789 790 /* 791 * Perform Bank switch operation. 792 * For multi link cases, the actual bank switch is 793 * synchronized across all Masters and happens later as a 794 * part of post_bank_switch ops. 795 */ 796 ret = sdw_bank_switch(bus, m_rt_count); 797 if (ret < 0) { 798 dev_err(bus->dev, "Bank switch failed: %d\n", ret); 799 goto error; 800 } 801 } 802 803 /* 804 * For multi link cases, it is expected that the bank switch is 805 * triggered by the post_bank_switch for the first Master in the list 806 * and for the other Masters the post_bank_switch() should return doing 807 * nothing. 808 */ 809 list_for_each_entry(m_rt, &stream->master_list, stream_node) { 810 bus = m_rt->bus; 811 ops = bus->ops; 812 813 /* Post-bank switch */ 814 if (ops->post_bank_switch) { 815 ret = ops->post_bank_switch(bus); 816 if (ret < 0) { 817 dev_err(bus->dev, 818 "Post bank switch op failed: %d\n", 819 ret); 820 goto error; 821 } 822 } else if (multi_link) { 823 dev_err(bus->dev, 824 "Post bank switch ops not implemented\n"); 825 goto error; 826 } 827 828 /* Set the bank switch timeout to default, if not set */ 829 if (!bus->bank_switch_timeout) 830 bus->bank_switch_timeout = DEFAULT_BANK_SWITCH_TIMEOUT; 831 832 /* Check if bank switch was successful */ 833 ret = sdw_ml_sync_bank_switch(bus); 834 if (ret < 0) { 835 dev_err(bus->dev, 836 "multi link bank switch failed: %d\n", ret); 837 goto error; 838 } 839 840 if (multi_link) 841 mutex_unlock(&bus->msg_lock); 842 } 843 844 return ret; 845 846 error: 847 list_for_each_entry(m_rt, &stream->master_list, stream_node) { 848 bus = m_rt->bus; 849 if (bus->defer_msg.msg) { 850 kfree(bus->defer_msg.msg->buf); 851 kfree(bus->defer_msg.msg); 852 } 853 } 854 855 msg_unlock: 856 857 if (multi_link) { 858 list_for_each_entry(m_rt, &stream->master_list, stream_node) { 859 bus = m_rt->bus; 860 if (mutex_is_locked(&bus->msg_lock)) 861 mutex_unlock(&bus->msg_lock); 862 } 863 } 864 865 return ret; 866 } 867 868 static struct sdw_port_runtime *sdw_port_alloc(struct list_head *port_list) 869 { 870 struct sdw_port_runtime *p_rt; 871 872 p_rt = kzalloc(sizeof(*p_rt), GFP_KERNEL); 873 if (!p_rt) 874 return NULL; 875 876 list_add_tail(&p_rt->port_node, port_list); 877 878 return p_rt; 879 } 880 881 static int sdw_port_config(struct sdw_port_runtime *p_rt, 882 struct sdw_port_config *port_config, 883 int port_index) 884 { 885 p_rt->ch_mask = port_config[port_index].ch_mask; 886 p_rt->num = port_config[port_index].num; 887 888 /* 889 * TODO: Check port capabilities for requested configuration 890 */ 891 892 return 0; 893 } 894 895 static void sdw_port_free(struct sdw_port_runtime *p_rt) 896 { 897 list_del(&p_rt->port_node); 898 kfree(p_rt); 899 } 900 901 /** 902 * sdw_release_stream() - Free the assigned stream runtime 903 * 904 * @stream: SoundWire stream runtime 905 * 906 * sdw_release_stream should be called only once per stream 907 */ 908 void sdw_release_stream(struct sdw_stream_runtime *stream) 909 { 910 kfree(stream); 911 } 912 EXPORT_SYMBOL(sdw_release_stream); 913 914 /** 915 * sdw_alloc_stream() - Allocate and return stream runtime 916 * 917 * @stream_name: SoundWire stream name 918 * 919 * Allocates a SoundWire stream runtime instance. 920 * sdw_alloc_stream should be called only once per stream. Typically 921 * invoked from ALSA/ASoC machine/platform driver. 922 */ 923 struct sdw_stream_runtime *sdw_alloc_stream(const char *stream_name) 924 { 925 struct sdw_stream_runtime *stream; 926 927 stream = kzalloc(sizeof(*stream), GFP_KERNEL); 928 if (!stream) 929 return NULL; 930 931 stream->name = stream_name; 932 INIT_LIST_HEAD(&stream->master_list); 933 stream->state = SDW_STREAM_ALLOCATED; 934 stream->m_rt_count = 0; 935 936 return stream; 937 } 938 EXPORT_SYMBOL(sdw_alloc_stream); 939 940 static struct sdw_master_runtime 941 *sdw_find_master_rt(struct sdw_bus *bus, 942 struct sdw_stream_runtime *stream) 943 { 944 struct sdw_master_runtime *m_rt; 945 946 /* Retrieve Bus handle if already available */ 947 list_for_each_entry(m_rt, &stream->master_list, stream_node) { 948 if (m_rt->bus == bus) 949 return m_rt; 950 } 951 952 return NULL; 953 } 954 955 /** 956 * sdw_alloc_master_rt() - Allocates and initialize Master runtime handle 957 * 958 * @bus: SDW bus instance 959 * @stream_config: Stream configuration 960 * @stream: Stream runtime handle. 961 * 962 * This function is to be called with bus_lock held. 963 */ 964 static struct sdw_master_runtime 965 *sdw_alloc_master_rt(struct sdw_bus *bus, 966 struct sdw_stream_config *stream_config, 967 struct sdw_stream_runtime *stream) 968 { 969 struct sdw_master_runtime *m_rt; 970 971 /* 972 * check if Master is already allocated (as a result of Slave adding 973 * it first), if so skip allocation and go to configure 974 */ 975 m_rt = sdw_find_master_rt(bus, stream); 976 if (m_rt) 977 goto stream_config; 978 979 m_rt = kzalloc(sizeof(*m_rt), GFP_KERNEL); 980 if (!m_rt) 981 return NULL; 982 983 /* Initialization of Master runtime handle */ 984 INIT_LIST_HEAD(&m_rt->port_list); 985 INIT_LIST_HEAD(&m_rt->slave_rt_list); 986 list_add_tail(&m_rt->stream_node, &stream->master_list); 987 988 list_add_tail(&m_rt->bus_node, &bus->m_rt_list); 989 990 stream_config: 991 m_rt->ch_count = stream_config->ch_count; 992 m_rt->bus = bus; 993 m_rt->stream = stream; 994 m_rt->direction = stream_config->direction; 995 996 return m_rt; 997 } 998 999 /** 1000 * sdw_alloc_slave_rt() - Allocate and initialize Slave runtime handle. 1001 * 1002 * @slave: Slave handle 1003 * @stream_config: Stream configuration 1004 * 1005 * This function is to be called with bus_lock held. 1006 */ 1007 static struct sdw_slave_runtime 1008 *sdw_alloc_slave_rt(struct sdw_slave *slave, 1009 struct sdw_stream_config *stream_config) 1010 { 1011 struct sdw_slave_runtime *s_rt; 1012 1013 s_rt = kzalloc(sizeof(*s_rt), GFP_KERNEL); 1014 if (!s_rt) 1015 return NULL; 1016 1017 INIT_LIST_HEAD(&s_rt->port_list); 1018 s_rt->ch_count = stream_config->ch_count; 1019 s_rt->direction = stream_config->direction; 1020 s_rt->slave = slave; 1021 1022 return s_rt; 1023 } 1024 1025 static void sdw_master_port_release(struct sdw_bus *bus, 1026 struct sdw_master_runtime *m_rt) 1027 { 1028 struct sdw_port_runtime *p_rt, *_p_rt; 1029 1030 list_for_each_entry_safe(p_rt, _p_rt, &m_rt->port_list, port_node) { 1031 sdw_port_free(p_rt); 1032 } 1033 } 1034 1035 static void sdw_slave_port_release(struct sdw_bus *bus, 1036 struct sdw_slave *slave, 1037 struct sdw_stream_runtime *stream) 1038 { 1039 struct sdw_port_runtime *p_rt, *_p_rt; 1040 struct sdw_master_runtime *m_rt; 1041 struct sdw_slave_runtime *s_rt; 1042 1043 list_for_each_entry(m_rt, &stream->master_list, stream_node) { 1044 list_for_each_entry(s_rt, &m_rt->slave_rt_list, m_rt_node) { 1045 if (s_rt->slave != slave) 1046 continue; 1047 1048 list_for_each_entry_safe(p_rt, _p_rt, 1049 &s_rt->port_list, port_node) { 1050 sdw_port_free(p_rt); 1051 } 1052 } 1053 } 1054 } 1055 1056 /** 1057 * sdw_release_slave_stream() - Free Slave(s) runtime handle 1058 * 1059 * @slave: Slave handle. 1060 * @stream: Stream runtime handle. 1061 * 1062 * This function is to be called with bus_lock held. 1063 */ 1064 static void sdw_release_slave_stream(struct sdw_slave *slave, 1065 struct sdw_stream_runtime *stream) 1066 { 1067 struct sdw_slave_runtime *s_rt, *_s_rt; 1068 struct sdw_master_runtime *m_rt; 1069 1070 list_for_each_entry(m_rt, &stream->master_list, stream_node) { 1071 /* Retrieve Slave runtime handle */ 1072 list_for_each_entry_safe(s_rt, _s_rt, 1073 &m_rt->slave_rt_list, m_rt_node) { 1074 if (s_rt->slave == slave) { 1075 list_del(&s_rt->m_rt_node); 1076 kfree(s_rt); 1077 return; 1078 } 1079 } 1080 } 1081 } 1082 1083 /** 1084 * sdw_release_master_stream() - Free Master runtime handle 1085 * 1086 * @m_rt: Master runtime node 1087 * @stream: Stream runtime handle. 1088 * 1089 * This function is to be called with bus_lock held 1090 * It frees the Master runtime handle and associated Slave(s) runtime 1091 * handle. If this is called first then sdw_release_slave_stream() will have 1092 * no effect as Slave(s) runtime handle would already be freed up. 1093 */ 1094 static void sdw_release_master_stream(struct sdw_master_runtime *m_rt, 1095 struct sdw_stream_runtime *stream) 1096 { 1097 struct sdw_slave_runtime *s_rt, *_s_rt; 1098 1099 list_for_each_entry_safe(s_rt, _s_rt, &m_rt->slave_rt_list, m_rt_node) { 1100 sdw_slave_port_release(s_rt->slave->bus, s_rt->slave, stream); 1101 sdw_release_slave_stream(s_rt->slave, stream); 1102 } 1103 1104 list_del(&m_rt->stream_node); 1105 list_del(&m_rt->bus_node); 1106 kfree(m_rt); 1107 } 1108 1109 /** 1110 * sdw_stream_remove_master() - Remove master from sdw_stream 1111 * 1112 * @bus: SDW Bus instance 1113 * @stream: SoundWire stream 1114 * 1115 * This removes and frees port_rt and master_rt from a stream 1116 */ 1117 int sdw_stream_remove_master(struct sdw_bus *bus, 1118 struct sdw_stream_runtime *stream) 1119 { 1120 struct sdw_master_runtime *m_rt, *_m_rt; 1121 1122 mutex_lock(&bus->bus_lock); 1123 1124 list_for_each_entry_safe(m_rt, _m_rt, 1125 &stream->master_list, stream_node) { 1126 if (m_rt->bus != bus) 1127 continue; 1128 1129 sdw_master_port_release(bus, m_rt); 1130 sdw_release_master_stream(m_rt, stream); 1131 stream->m_rt_count--; 1132 } 1133 1134 if (list_empty(&stream->master_list)) 1135 stream->state = SDW_STREAM_RELEASED; 1136 1137 mutex_unlock(&bus->bus_lock); 1138 1139 return 0; 1140 } 1141 EXPORT_SYMBOL(sdw_stream_remove_master); 1142 1143 /** 1144 * sdw_stream_remove_slave() - Remove slave from sdw_stream 1145 * 1146 * @slave: SDW Slave instance 1147 * @stream: SoundWire stream 1148 * 1149 * This removes and frees port_rt and slave_rt from a stream 1150 */ 1151 int sdw_stream_remove_slave(struct sdw_slave *slave, 1152 struct sdw_stream_runtime *stream) 1153 { 1154 mutex_lock(&slave->bus->bus_lock); 1155 1156 sdw_slave_port_release(slave->bus, slave, stream); 1157 sdw_release_slave_stream(slave, stream); 1158 1159 mutex_unlock(&slave->bus->bus_lock); 1160 1161 return 0; 1162 } 1163 EXPORT_SYMBOL(sdw_stream_remove_slave); 1164 1165 /** 1166 * sdw_config_stream() - Configure the allocated stream 1167 * 1168 * @dev: SDW device 1169 * @stream: SoundWire stream 1170 * @stream_config: Stream configuration for audio stream 1171 * @is_slave: is API called from Slave or Master 1172 * 1173 * This function is to be called with bus_lock held. 1174 */ 1175 static int sdw_config_stream(struct device *dev, 1176 struct sdw_stream_runtime *stream, 1177 struct sdw_stream_config *stream_config, 1178 bool is_slave) 1179 { 1180 /* 1181 * Update the stream rate, channel and bps based on data 1182 * source. For more than one data source (multilink), 1183 * match the rate, bps, stream type and increment number of channels. 1184 * 1185 * If rate/bps is zero, it means the values are not set, so skip 1186 * comparison and allow the value to be set and stored in stream 1187 */ 1188 if (stream->params.rate && 1189 stream->params.rate != stream_config->frame_rate) { 1190 dev_err(dev, "rate not matching, stream:%s\n", stream->name); 1191 return -EINVAL; 1192 } 1193 1194 if (stream->params.bps && 1195 stream->params.bps != stream_config->bps) { 1196 dev_err(dev, "bps not matching, stream:%s\n", stream->name); 1197 return -EINVAL; 1198 } 1199 1200 stream->type = stream_config->type; 1201 stream->params.rate = stream_config->frame_rate; 1202 stream->params.bps = stream_config->bps; 1203 1204 /* TODO: Update this check during Device-device support */ 1205 if (is_slave) 1206 stream->params.ch_count += stream_config->ch_count; 1207 1208 return 0; 1209 } 1210 1211 static int sdw_is_valid_port_range(struct device *dev, int num) 1212 { 1213 if (!SDW_VALID_PORT_RANGE(num)) { 1214 dev_err(dev, "SoundWire: Invalid port number :%d\n", num); 1215 return -EINVAL; 1216 } 1217 1218 return 0; 1219 } 1220 1221 static int sdw_master_port_config(struct sdw_bus *bus, 1222 struct sdw_master_runtime *m_rt, 1223 struct sdw_port_config *port_config, 1224 unsigned int num_ports) 1225 { 1226 struct sdw_port_runtime *p_rt; 1227 int ret; 1228 int i; 1229 1230 /* Iterate for number of ports to perform initialization */ 1231 for (i = 0; i < num_ports; i++) { 1232 p_rt = sdw_port_alloc(&m_rt->port_list); 1233 if (!p_rt) 1234 return -ENOMEM; 1235 1236 ret = sdw_port_config(p_rt, port_config, i); 1237 if (ret < 0) 1238 return ret; 1239 } 1240 1241 return 0; 1242 } 1243 1244 static int sdw_slave_port_config(struct sdw_slave *slave, 1245 struct sdw_slave_runtime *s_rt, 1246 struct sdw_port_config *port_config, 1247 unsigned int num_config) 1248 { 1249 struct sdw_port_runtime *p_rt; 1250 int i, ret; 1251 1252 /* Iterate for number of ports to perform initialization */ 1253 for (i = 0; i < num_config; i++) { 1254 p_rt = sdw_port_alloc(&s_rt->port_list); 1255 if (!p_rt) 1256 return -ENOMEM; 1257 1258 /* 1259 * TODO: Check valid port range as defined by DisCo/ 1260 * slave 1261 */ 1262 ret = sdw_is_valid_port_range(&slave->dev, port_config[i].num); 1263 if (ret < 0) 1264 return ret; 1265 1266 ret = sdw_port_config(p_rt, port_config, i); 1267 if (ret < 0) 1268 return ret; 1269 } 1270 1271 return 0; 1272 } 1273 1274 /** 1275 * sdw_stream_add_master() - Allocate and add master runtime to a stream 1276 * 1277 * @bus: SDW Bus instance 1278 * @stream_config: Stream configuration for audio stream 1279 * @port_config: Port configuration for audio stream 1280 * @num_ports: Number of ports 1281 * @stream: SoundWire stream 1282 */ 1283 int sdw_stream_add_master(struct sdw_bus *bus, 1284 struct sdw_stream_config *stream_config, 1285 struct sdw_port_config *port_config, 1286 unsigned int num_ports, 1287 struct sdw_stream_runtime *stream) 1288 { 1289 struct sdw_master_runtime *m_rt; 1290 int ret; 1291 1292 mutex_lock(&bus->bus_lock); 1293 1294 /* 1295 * For multi link streams, add the second master only if 1296 * the bus supports it. 1297 * Check if bus->multi_link is set 1298 */ 1299 if (!bus->multi_link && stream->m_rt_count > 0) { 1300 dev_err(bus->dev, 1301 "Multilink not supported, link %d\n", bus->link_id); 1302 ret = -EINVAL; 1303 goto unlock; 1304 } 1305 1306 m_rt = sdw_alloc_master_rt(bus, stream_config, stream); 1307 if (!m_rt) { 1308 dev_err(bus->dev, 1309 "Master runtime config failed for stream:%s\n", 1310 stream->name); 1311 ret = -ENOMEM; 1312 goto unlock; 1313 } 1314 1315 ret = sdw_config_stream(bus->dev, stream, stream_config, false); 1316 if (ret) 1317 goto stream_error; 1318 1319 ret = sdw_master_port_config(bus, m_rt, port_config, num_ports); 1320 if (ret) 1321 goto stream_error; 1322 1323 stream->m_rt_count++; 1324 1325 goto unlock; 1326 1327 stream_error: 1328 sdw_release_master_stream(m_rt, stream); 1329 unlock: 1330 mutex_unlock(&bus->bus_lock); 1331 return ret; 1332 } 1333 EXPORT_SYMBOL(sdw_stream_add_master); 1334 1335 /** 1336 * sdw_stream_add_slave() - Allocate and add master/slave runtime to a stream 1337 * 1338 * @slave: SDW Slave instance 1339 * @stream_config: Stream configuration for audio stream 1340 * @stream: SoundWire stream 1341 * @port_config: Port configuration for audio stream 1342 * @num_ports: Number of ports 1343 * 1344 * It is expected that Slave is added before adding Master 1345 * to the Stream. 1346 * 1347 */ 1348 int sdw_stream_add_slave(struct sdw_slave *slave, 1349 struct sdw_stream_config *stream_config, 1350 struct sdw_port_config *port_config, 1351 unsigned int num_ports, 1352 struct sdw_stream_runtime *stream) 1353 { 1354 struct sdw_slave_runtime *s_rt; 1355 struct sdw_master_runtime *m_rt; 1356 int ret; 1357 1358 mutex_lock(&slave->bus->bus_lock); 1359 1360 /* 1361 * If this API is invoked by Slave first then m_rt is not valid. 1362 * So, allocate m_rt and add Slave to it. 1363 */ 1364 m_rt = sdw_alloc_master_rt(slave->bus, stream_config, stream); 1365 if (!m_rt) { 1366 dev_err(&slave->dev, 1367 "alloc master runtime failed for stream:%s\n", 1368 stream->name); 1369 ret = -ENOMEM; 1370 goto error; 1371 } 1372 1373 s_rt = sdw_alloc_slave_rt(slave, stream_config); 1374 if (!s_rt) { 1375 dev_err(&slave->dev, 1376 "Slave runtime config failed for stream:%s\n", 1377 stream->name); 1378 ret = -ENOMEM; 1379 goto stream_error; 1380 } 1381 list_add_tail(&s_rt->m_rt_node, &m_rt->slave_rt_list); 1382 1383 ret = sdw_config_stream(&slave->dev, stream, stream_config, true); 1384 if (ret) 1385 goto stream_error; 1386 1387 ret = sdw_slave_port_config(slave, s_rt, port_config, num_ports); 1388 if (ret) 1389 goto stream_error; 1390 1391 /* 1392 * Change stream state to CONFIGURED on first Slave add. 1393 * Bus is not aware of number of Slave(s) in a stream at this 1394 * point so cannot depend on all Slave(s) to be added in order to 1395 * change stream state to CONFIGURED. 1396 */ 1397 stream->state = SDW_STREAM_CONFIGURED; 1398 goto error; 1399 1400 stream_error: 1401 /* 1402 * we hit error so cleanup the stream, release all Slave(s) and 1403 * Master runtime 1404 */ 1405 sdw_release_master_stream(m_rt, stream); 1406 error: 1407 mutex_unlock(&slave->bus->bus_lock); 1408 return ret; 1409 } 1410 EXPORT_SYMBOL(sdw_stream_add_slave); 1411 1412 /** 1413 * sdw_get_slave_dpn_prop() - Get Slave port capabilities 1414 * 1415 * @slave: Slave handle 1416 * @direction: Data direction. 1417 * @port_num: Port number 1418 */ 1419 struct sdw_dpn_prop *sdw_get_slave_dpn_prop(struct sdw_slave *slave, 1420 enum sdw_data_direction direction, 1421 unsigned int port_num) 1422 { 1423 struct sdw_dpn_prop *dpn_prop; 1424 u8 num_ports; 1425 int i; 1426 1427 if (direction == SDW_DATA_DIR_TX) { 1428 num_ports = hweight32(slave->prop.source_ports); 1429 dpn_prop = slave->prop.src_dpn_prop; 1430 } else { 1431 num_ports = hweight32(slave->prop.sink_ports); 1432 dpn_prop = slave->prop.sink_dpn_prop; 1433 } 1434 1435 for (i = 0; i < num_ports; i++) { 1436 if (dpn_prop[i].num == port_num) 1437 return &dpn_prop[i]; 1438 } 1439 1440 return NULL; 1441 } 1442 1443 /** 1444 * sdw_acquire_bus_lock: Acquire bus lock for all Master runtime(s) 1445 * 1446 * @stream: SoundWire stream 1447 * 1448 * Acquire bus_lock for each of the master runtime(m_rt) part of this 1449 * stream to reconfigure the bus. 1450 * NOTE: This function is called from SoundWire stream ops and is 1451 * expected that a global lock is held before acquiring bus_lock. 1452 */ 1453 static void sdw_acquire_bus_lock(struct sdw_stream_runtime *stream) 1454 { 1455 struct sdw_master_runtime *m_rt; 1456 struct sdw_bus *bus; 1457 1458 /* Iterate for all Master(s) in Master list */ 1459 list_for_each_entry(m_rt, &stream->master_list, stream_node) { 1460 bus = m_rt->bus; 1461 1462 mutex_lock(&bus->bus_lock); 1463 } 1464 } 1465 1466 /** 1467 * sdw_release_bus_lock: Release bus lock for all Master runtime(s) 1468 * 1469 * @stream: SoundWire stream 1470 * 1471 * Release the previously held bus_lock after reconfiguring the bus. 1472 * NOTE: This function is called from SoundWire stream ops and is 1473 * expected that a global lock is held before releasing bus_lock. 1474 */ 1475 static void sdw_release_bus_lock(struct sdw_stream_runtime *stream) 1476 { 1477 struct sdw_master_runtime *m_rt; 1478 struct sdw_bus *bus; 1479 1480 /* Iterate for all Master(s) in Master list */ 1481 list_for_each_entry_reverse(m_rt, &stream->master_list, stream_node) { 1482 bus = m_rt->bus; 1483 mutex_unlock(&bus->bus_lock); 1484 } 1485 } 1486 1487 static int _sdw_prepare_stream(struct sdw_stream_runtime *stream, 1488 bool update_params) 1489 { 1490 struct sdw_master_runtime *m_rt; 1491 struct sdw_bus *bus = NULL; 1492 struct sdw_master_prop *prop; 1493 struct sdw_bus_params params; 1494 int ret; 1495 1496 /* Prepare Master(s) and Slave(s) port(s) associated with stream */ 1497 list_for_each_entry(m_rt, &stream->master_list, stream_node) { 1498 bus = m_rt->bus; 1499 prop = &bus->prop; 1500 memcpy(¶ms, &bus->params, sizeof(params)); 1501 1502 /* TODO: Support Asynchronous mode */ 1503 if ((prop->max_clk_freq % stream->params.rate) != 0) { 1504 dev_err(bus->dev, "Async mode not supported\n"); 1505 return -EINVAL; 1506 } 1507 1508 if (!update_params) 1509 goto program_params; 1510 1511 /* Increment cumulative bus bandwidth */ 1512 /* TODO: Update this during Device-Device support */ 1513 bus->params.bandwidth += m_rt->stream->params.rate * 1514 m_rt->ch_count * m_rt->stream->params.bps; 1515 1516 /* Compute params */ 1517 if (bus->compute_params) { 1518 ret = bus->compute_params(bus); 1519 if (ret < 0) { 1520 dev_err(bus->dev, "Compute params failed: %d\n", 1521 ret); 1522 return ret; 1523 } 1524 } 1525 1526 program_params: 1527 /* Program params */ 1528 ret = sdw_program_params(bus, true); 1529 if (ret < 0) { 1530 dev_err(bus->dev, "Program params failed: %d\n", ret); 1531 goto restore_params; 1532 } 1533 } 1534 1535 if (!bus) { 1536 pr_err("Configuration error in %s\n", __func__); 1537 return -EINVAL; 1538 } 1539 1540 ret = do_bank_switch(stream); 1541 if (ret < 0) { 1542 dev_err(bus->dev, "Bank switch failed: %d\n", ret); 1543 goto restore_params; 1544 } 1545 1546 list_for_each_entry(m_rt, &stream->master_list, stream_node) { 1547 bus = m_rt->bus; 1548 1549 /* Prepare port(s) on the new clock configuration */ 1550 ret = sdw_prep_deprep_ports(m_rt, true); 1551 if (ret < 0) { 1552 dev_err(bus->dev, "Prepare port(s) failed ret = %d\n", 1553 ret); 1554 return ret; 1555 } 1556 } 1557 1558 stream->state = SDW_STREAM_PREPARED; 1559 1560 return ret; 1561 1562 restore_params: 1563 memcpy(&bus->params, ¶ms, sizeof(params)); 1564 return ret; 1565 } 1566 1567 /** 1568 * sdw_prepare_stream() - Prepare SoundWire stream 1569 * 1570 * @stream: Soundwire stream 1571 * 1572 * Documentation/driver-api/soundwire/stream.rst explains this API in detail 1573 */ 1574 int sdw_prepare_stream(struct sdw_stream_runtime *stream) 1575 { 1576 bool update_params = true; 1577 int ret; 1578 1579 if (!stream) { 1580 pr_err("SoundWire: Handle not found for stream\n"); 1581 return -EINVAL; 1582 } 1583 1584 sdw_acquire_bus_lock(stream); 1585 1586 if (stream->state == SDW_STREAM_PREPARED) { 1587 ret = 0; 1588 goto state_err; 1589 } 1590 1591 if (stream->state != SDW_STREAM_CONFIGURED && 1592 stream->state != SDW_STREAM_DEPREPARED && 1593 stream->state != SDW_STREAM_DISABLED) { 1594 pr_err("%s: %s: inconsistent state state %d\n", 1595 __func__, stream->name, stream->state); 1596 ret = -EINVAL; 1597 goto state_err; 1598 } 1599 1600 /* 1601 * when the stream is DISABLED, this means sdw_prepare_stream() 1602 * is called as a result of an underflow or a resume operation. 1603 * In this case, the bus parameters shall not be recomputed, but 1604 * still need to be re-applied 1605 */ 1606 if (stream->state == SDW_STREAM_DISABLED) 1607 update_params = false; 1608 1609 ret = _sdw_prepare_stream(stream, update_params); 1610 1611 state_err: 1612 sdw_release_bus_lock(stream); 1613 return ret; 1614 } 1615 EXPORT_SYMBOL(sdw_prepare_stream); 1616 1617 static int _sdw_enable_stream(struct sdw_stream_runtime *stream) 1618 { 1619 struct sdw_master_runtime *m_rt; 1620 struct sdw_bus *bus = NULL; 1621 int ret; 1622 1623 /* Enable Master(s) and Slave(s) port(s) associated with stream */ 1624 list_for_each_entry(m_rt, &stream->master_list, stream_node) { 1625 bus = m_rt->bus; 1626 1627 /* Program params */ 1628 ret = sdw_program_params(bus, false); 1629 if (ret < 0) { 1630 dev_err(bus->dev, "Program params failed: %d\n", ret); 1631 return ret; 1632 } 1633 1634 /* Enable port(s) */ 1635 ret = sdw_enable_disable_ports(m_rt, true); 1636 if (ret < 0) { 1637 dev_err(bus->dev, 1638 "Enable port(s) failed ret: %d\n", ret); 1639 return ret; 1640 } 1641 } 1642 1643 if (!bus) { 1644 pr_err("Configuration error in %s\n", __func__); 1645 return -EINVAL; 1646 } 1647 1648 ret = do_bank_switch(stream); 1649 if (ret < 0) { 1650 dev_err(bus->dev, "Bank switch failed: %d\n", ret); 1651 return ret; 1652 } 1653 1654 stream->state = SDW_STREAM_ENABLED; 1655 return 0; 1656 } 1657 1658 /** 1659 * sdw_enable_stream() - Enable SoundWire stream 1660 * 1661 * @stream: Soundwire stream 1662 * 1663 * Documentation/driver-api/soundwire/stream.rst explains this API in detail 1664 */ 1665 int sdw_enable_stream(struct sdw_stream_runtime *stream) 1666 { 1667 int ret; 1668 1669 if (!stream) { 1670 pr_err("SoundWire: Handle not found for stream\n"); 1671 return -EINVAL; 1672 } 1673 1674 sdw_acquire_bus_lock(stream); 1675 1676 if (stream->state != SDW_STREAM_PREPARED && 1677 stream->state != SDW_STREAM_DISABLED) { 1678 pr_err("%s: %s: inconsistent state state %d\n", 1679 __func__, stream->name, stream->state); 1680 ret = -EINVAL; 1681 goto state_err; 1682 } 1683 1684 ret = _sdw_enable_stream(stream); 1685 1686 state_err: 1687 sdw_release_bus_lock(stream); 1688 return ret; 1689 } 1690 EXPORT_SYMBOL(sdw_enable_stream); 1691 1692 static int _sdw_disable_stream(struct sdw_stream_runtime *stream) 1693 { 1694 struct sdw_master_runtime *m_rt; 1695 int ret; 1696 1697 list_for_each_entry(m_rt, &stream->master_list, stream_node) { 1698 struct sdw_bus *bus = m_rt->bus; 1699 1700 /* Disable port(s) */ 1701 ret = sdw_enable_disable_ports(m_rt, false); 1702 if (ret < 0) { 1703 dev_err(bus->dev, "Disable port(s) failed: %d\n", ret); 1704 return ret; 1705 } 1706 } 1707 stream->state = SDW_STREAM_DISABLED; 1708 1709 list_for_each_entry(m_rt, &stream->master_list, stream_node) { 1710 struct sdw_bus *bus = m_rt->bus; 1711 1712 /* Program params */ 1713 ret = sdw_program_params(bus, false); 1714 if (ret < 0) { 1715 dev_err(bus->dev, "Program params failed: %d\n", ret); 1716 return ret; 1717 } 1718 } 1719 1720 ret = do_bank_switch(stream); 1721 if (ret < 0) { 1722 pr_err("Bank switch failed: %d\n", ret); 1723 return ret; 1724 } 1725 1726 /* make sure alternate bank (previous current) is also disabled */ 1727 list_for_each_entry(m_rt, &stream->master_list, stream_node) { 1728 struct sdw_bus *bus = m_rt->bus; 1729 1730 /* Disable port(s) */ 1731 ret = sdw_enable_disable_ports(m_rt, false); 1732 if (ret < 0) { 1733 dev_err(bus->dev, "Disable port(s) failed: %d\n", ret); 1734 return ret; 1735 } 1736 } 1737 1738 return 0; 1739 } 1740 1741 /** 1742 * sdw_disable_stream() - Disable SoundWire stream 1743 * 1744 * @stream: Soundwire stream 1745 * 1746 * Documentation/driver-api/soundwire/stream.rst explains this API in detail 1747 */ 1748 int sdw_disable_stream(struct sdw_stream_runtime *stream) 1749 { 1750 int ret; 1751 1752 if (!stream) { 1753 pr_err("SoundWire: Handle not found for stream\n"); 1754 return -EINVAL; 1755 } 1756 1757 sdw_acquire_bus_lock(stream); 1758 1759 if (stream->state != SDW_STREAM_ENABLED) { 1760 pr_err("%s: %s: inconsistent state state %d\n", 1761 __func__, stream->name, stream->state); 1762 ret = -EINVAL; 1763 goto state_err; 1764 } 1765 1766 ret = _sdw_disable_stream(stream); 1767 1768 state_err: 1769 sdw_release_bus_lock(stream); 1770 return ret; 1771 } 1772 EXPORT_SYMBOL(sdw_disable_stream); 1773 1774 static int _sdw_deprepare_stream(struct sdw_stream_runtime *stream) 1775 { 1776 struct sdw_master_runtime *m_rt; 1777 struct sdw_bus *bus; 1778 int ret = 0; 1779 1780 list_for_each_entry(m_rt, &stream->master_list, stream_node) { 1781 bus = m_rt->bus; 1782 /* De-prepare port(s) */ 1783 ret = sdw_prep_deprep_ports(m_rt, false); 1784 if (ret < 0) { 1785 dev_err(bus->dev, 1786 "De-prepare port(s) failed: %d\n", ret); 1787 return ret; 1788 } 1789 1790 /* TODO: Update this during Device-Device support */ 1791 bus->params.bandwidth -= m_rt->stream->params.rate * 1792 m_rt->ch_count * m_rt->stream->params.bps; 1793 1794 /* Compute params */ 1795 if (bus->compute_params) { 1796 ret = bus->compute_params(bus); 1797 if (ret < 0) { 1798 dev_err(bus->dev, "Compute params failed: %d\n", 1799 ret); 1800 return ret; 1801 } 1802 } 1803 1804 /* Program params */ 1805 ret = sdw_program_params(bus, false); 1806 if (ret < 0) { 1807 dev_err(bus->dev, "Program params failed: %d\n", ret); 1808 return ret; 1809 } 1810 } 1811 1812 stream->state = SDW_STREAM_DEPREPARED; 1813 return do_bank_switch(stream); 1814 } 1815 1816 /** 1817 * sdw_deprepare_stream() - Deprepare SoundWire stream 1818 * 1819 * @stream: Soundwire stream 1820 * 1821 * Documentation/driver-api/soundwire/stream.rst explains this API in detail 1822 */ 1823 int sdw_deprepare_stream(struct sdw_stream_runtime *stream) 1824 { 1825 int ret; 1826 1827 if (!stream) { 1828 pr_err("SoundWire: Handle not found for stream\n"); 1829 return -EINVAL; 1830 } 1831 1832 sdw_acquire_bus_lock(stream); 1833 1834 if (stream->state != SDW_STREAM_PREPARED && 1835 stream->state != SDW_STREAM_DISABLED) { 1836 pr_err("%s: %s: inconsistent state state %d\n", 1837 __func__, stream->name, stream->state); 1838 ret = -EINVAL; 1839 goto state_err; 1840 } 1841 1842 ret = _sdw_deprepare_stream(stream); 1843 1844 state_err: 1845 sdw_release_bus_lock(stream); 1846 return ret; 1847 } 1848 EXPORT_SYMBOL(sdw_deprepare_stream); 1849 1850 static int set_stream(struct snd_pcm_substream *substream, 1851 struct sdw_stream_runtime *sdw_stream) 1852 { 1853 struct snd_soc_pcm_runtime *rtd = substream->private_data; 1854 struct snd_soc_dai *dai; 1855 int ret = 0; 1856 int i; 1857 1858 /* Set stream pointer on all DAIs */ 1859 for_each_rtd_dais(rtd, i, dai) { 1860 ret = snd_soc_dai_set_stream(dai, sdw_stream, substream->stream); 1861 if (ret < 0) { 1862 dev_err(rtd->dev, "failed to set stream pointer on dai %s\n", dai->name); 1863 break; 1864 } 1865 } 1866 1867 return ret; 1868 } 1869 1870 /** 1871 * sdw_startup_stream() - Startup SoundWire stream 1872 * 1873 * @sdw_substream: Soundwire stream 1874 * 1875 * Documentation/driver-api/soundwire/stream.rst explains this API in detail 1876 */ 1877 int sdw_startup_stream(void *sdw_substream) 1878 { 1879 struct snd_pcm_substream *substream = sdw_substream; 1880 struct snd_soc_pcm_runtime *rtd = substream->private_data; 1881 struct sdw_stream_runtime *sdw_stream; 1882 char *name; 1883 int ret; 1884 1885 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) 1886 name = kasprintf(GFP_KERNEL, "%s-Playback", substream->name); 1887 else 1888 name = kasprintf(GFP_KERNEL, "%s-Capture", substream->name); 1889 1890 if (!name) 1891 return -ENOMEM; 1892 1893 sdw_stream = sdw_alloc_stream(name); 1894 if (!sdw_stream) { 1895 dev_err(rtd->dev, "alloc stream failed for substream DAI %s\n", substream->name); 1896 ret = -ENOMEM; 1897 goto error; 1898 } 1899 1900 ret = set_stream(substream, sdw_stream); 1901 if (ret < 0) 1902 goto release_stream; 1903 return 0; 1904 1905 release_stream: 1906 sdw_release_stream(sdw_stream); 1907 set_stream(substream, NULL); 1908 error: 1909 kfree(name); 1910 return ret; 1911 } 1912 EXPORT_SYMBOL(sdw_startup_stream); 1913 1914 /** 1915 * sdw_shutdown_stream() - Shutdown SoundWire stream 1916 * 1917 * @sdw_substream: Soundwire stream 1918 * 1919 * Documentation/driver-api/soundwire/stream.rst explains this API in detail 1920 */ 1921 void sdw_shutdown_stream(void *sdw_substream) 1922 { 1923 struct snd_pcm_substream *substream = sdw_substream; 1924 struct snd_soc_pcm_runtime *rtd = substream->private_data; 1925 struct sdw_stream_runtime *sdw_stream; 1926 struct snd_soc_dai *dai; 1927 1928 /* Find stream from first CPU DAI */ 1929 dai = asoc_rtd_to_cpu(rtd, 0); 1930 1931 sdw_stream = snd_soc_dai_get_stream(dai, substream->stream); 1932 1933 if (IS_ERR(sdw_stream)) { 1934 dev_err(rtd->dev, "no stream found for DAI %s\n", dai->name); 1935 return; 1936 } 1937 1938 /* release memory */ 1939 kfree(sdw_stream->name); 1940 sdw_release_stream(sdw_stream); 1941 1942 /* clear DAI data */ 1943 set_stream(substream, NULL); 1944 } 1945 EXPORT_SYMBOL(sdw_shutdown_stream); 1946