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 */ 25int 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}; 28EXPORT_SYMBOL(sdw_rows); 29 30int sdw_cols[SDW_FRAME_COLS] = {2, 4, 6, 8, 10, 12, 14, 16}; 31EXPORT_SYMBOL(sdw_cols); 32 33int 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} 45EXPORT_SYMBOL(sdw_find_col_index); 46 47int 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} 59EXPORT_SYMBOL(sdw_find_row_index); 60 61static 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 124static int sdw_program_slave_port_params(struct sdw_bus *bus, 125 struct sdw_slave_runtime *s_rt, 126 struct sdw_port_runtime *p_rt) 127{ 128 struct sdw_transport_params *t_params = &p_rt->transport_params; 129 struct sdw_port_params *p_params = &p_rt->port_params; 130 struct sdw_slave_prop *slave_prop = &s_rt->slave->prop; 131 u32 addr1, addr2, addr3, addr4, addr5, addr6; 132 struct sdw_dpn_prop *dpn_prop; 133 int ret; 134 u8 wbuf; 135 136 dpn_prop = sdw_get_slave_dpn_prop(s_rt->slave, 137 s_rt->direction, 138 t_params->port_num); 139 if (!dpn_prop) 140 return -EINVAL; 141 142 addr1 = SDW_DPN_PORTCTRL(t_params->port_num); 143 addr2 = SDW_DPN_BLOCKCTRL1(t_params->port_num); 144 145 if (bus->params.next_bank) { 146 addr3 = SDW_DPN_SAMPLECTRL1_B1(t_params->port_num); 147 addr4 = SDW_DPN_OFFSETCTRL1_B1(t_params->port_num); 148 addr5 = SDW_DPN_BLOCKCTRL2_B1(t_params->port_num); 149 addr6 = SDW_DPN_LANECTRL_B1(t_params->port_num); 150 151 } else { 152 addr3 = SDW_DPN_SAMPLECTRL1_B0(t_params->port_num); 153 addr4 = SDW_DPN_OFFSETCTRL1_B0(t_params->port_num); 154 addr5 = SDW_DPN_BLOCKCTRL2_B0(t_params->port_num); 155 addr6 = SDW_DPN_LANECTRL_B0(t_params->port_num); 156 } 157 158 /* Program DPN_PortCtrl register */ 159 wbuf = FIELD_PREP(SDW_DPN_PORTCTRL_DATAMODE, p_params->data_mode); 160 wbuf |= FIELD_PREP(SDW_DPN_PORTCTRL_FLOWMODE, p_params->flow_mode); 161 162 ret = sdw_update(s_rt->slave, addr1, 0xF, wbuf); 163 if (ret < 0) { 164 dev_err(&s_rt->slave->dev, 165 "DPN_PortCtrl register write failed for port %d\n", 166 t_params->port_num); 167 return ret; 168 } 169 170 if (!dpn_prop->read_only_wordlength) { 171 /* Program DPN_BlockCtrl1 register */ 172 ret = sdw_write(s_rt->slave, addr2, (p_params->bps - 1)); 173 if (ret < 0) { 174 dev_err(&s_rt->slave->dev, 175 "DPN_BlockCtrl1 register write failed for port %d\n", 176 t_params->port_num); 177 return ret; 178 } 179 } 180 181 /* Program DPN_SampleCtrl1 register */ 182 wbuf = (t_params->sample_interval - 1) & SDW_DPN_SAMPLECTRL_LOW; 183 ret = sdw_write(s_rt->slave, addr3, wbuf); 184 if (ret < 0) { 185 dev_err(&s_rt->slave->dev, 186 "DPN_SampleCtrl1 register write failed for port %d\n", 187 t_params->port_num); 188 return ret; 189 } 190 191 /* Program DPN_OffsetCtrl1 registers */ 192 ret = sdw_write(s_rt->slave, addr4, t_params->offset1); 193 if (ret < 0) { 194 dev_err(&s_rt->slave->dev, 195 "DPN_OffsetCtrl1 register write failed for port %d\n", 196 t_params->port_num); 197 return ret; 198 } 199 200 /* Program DPN_BlockCtrl2 register*/ 201 if (t_params->blk_grp_ctrl_valid) { 202 ret = sdw_write(s_rt->slave, addr5, t_params->blk_grp_ctrl); 203 if (ret < 0) { 204 dev_err(&s_rt->slave->dev, 205 "DPN_BlockCtrl2 reg write failed for port %d\n", 206 t_params->port_num); 207 return ret; 208 } 209 } 210 211 /* program DPN_LaneCtrl register */ 212 if (slave_prop->lane_control_support) { 213 ret = sdw_write(s_rt->slave, addr6, t_params->lane_ctrl); 214 if (ret < 0) { 215 dev_err(&s_rt->slave->dev, 216 "DPN_LaneCtrl register write failed for port %d\n", 217 t_params->port_num); 218 return ret; 219 } 220 } 221 222 if (dpn_prop->type != SDW_DPN_SIMPLE) { 223 ret = _sdw_program_slave_port_params(bus, s_rt->slave, 224 t_params, dpn_prop->type); 225 if (ret < 0) 226 dev_err(&s_rt->slave->dev, 227 "Transport reg write failed for port: %d\n", 228 t_params->port_num); 229 } 230 231 return ret; 232} 233 234static int sdw_program_master_port_params(struct sdw_bus *bus, 235 struct sdw_port_runtime *p_rt) 236{ 237 int ret; 238 239 /* 240 * we need to set transport and port parameters for the port. 241 * Transport parameters refers to the sample interval, offsets and 242 * hstart/stop etc of the data. Port parameters refers to word 243 * length, flow mode etc of the port 244 */ 245 ret = bus->port_ops->dpn_set_port_transport_params(bus, 246 &p_rt->transport_params, 247 bus->params.next_bank); 248 if (ret < 0) 249 return ret; 250 251 return bus->port_ops->dpn_set_port_params(bus, 252 &p_rt->port_params, 253 bus->params.next_bank); 254} 255 256/** 257 * sdw_program_port_params() - Programs transport parameters of Master(s) 258 * and Slave(s) 259 * 260 * @m_rt: Master stream runtime 261 */ 262static int sdw_program_port_params(struct sdw_master_runtime *m_rt) 263{ 264 struct sdw_slave_runtime *s_rt = NULL; 265 struct sdw_bus *bus = m_rt->bus; 266 struct sdw_port_runtime *p_rt; 267 int ret = 0; 268 269 /* Program transport & port parameters for Slave(s) */ 270 list_for_each_entry(s_rt, &m_rt->slave_rt_list, m_rt_node) { 271 list_for_each_entry(p_rt, &s_rt->port_list, port_node) { 272 ret = sdw_program_slave_port_params(bus, s_rt, p_rt); 273 if (ret < 0) 274 return ret; 275 } 276 } 277 278 /* Program transport & port parameters for Master(s) */ 279 list_for_each_entry(p_rt, &m_rt->port_list, port_node) { 280 ret = sdw_program_master_port_params(bus, p_rt); 281 if (ret < 0) 282 return ret; 283 } 284 285 return 0; 286} 287 288/** 289 * sdw_enable_disable_slave_ports: Enable/disable slave data port 290 * 291 * @bus: bus instance 292 * @s_rt: slave runtime 293 * @p_rt: port runtime 294 * @en: enable or disable operation 295 * 296 * This function only sets the enable/disable bits in the relevant bank, the 297 * actual enable/disable is done with a bank switch 298 */ 299static int sdw_enable_disable_slave_ports(struct sdw_bus *bus, 300 struct sdw_slave_runtime *s_rt, 301 struct sdw_port_runtime *p_rt, 302 bool en) 303{ 304 struct sdw_transport_params *t_params = &p_rt->transport_params; 305 u32 addr; 306 int ret; 307 308 if (bus->params.next_bank) 309 addr = SDW_DPN_CHANNELEN_B1(p_rt->num); 310 else 311 addr = SDW_DPN_CHANNELEN_B0(p_rt->num); 312 313 /* 314 * Since bus doesn't support sharing a port across two streams, 315 * it is safe to reset this register 316 */ 317 if (en) 318 ret = sdw_write(s_rt->slave, addr, p_rt->ch_mask); 319 else 320 ret = sdw_write(s_rt->slave, addr, 0x0); 321 322 if (ret < 0) 323 dev_err(&s_rt->slave->dev, 324 "Slave chn_en reg write failed:%d port:%d\n", 325 ret, t_params->port_num); 326 327 return ret; 328} 329 330static int sdw_enable_disable_master_ports(struct sdw_master_runtime *m_rt, 331 struct sdw_port_runtime *p_rt, 332 bool en) 333{ 334 struct sdw_transport_params *t_params = &p_rt->transport_params; 335 struct sdw_bus *bus = m_rt->bus; 336 struct sdw_enable_ch enable_ch; 337 int ret; 338 339 enable_ch.port_num = p_rt->num; 340 enable_ch.ch_mask = p_rt->ch_mask; 341 enable_ch.enable = en; 342 343 /* Perform Master port channel(s) enable/disable */ 344 if (bus->port_ops->dpn_port_enable_ch) { 345 ret = bus->port_ops->dpn_port_enable_ch(bus, 346 &enable_ch, 347 bus->params.next_bank); 348 if (ret < 0) { 349 dev_err(bus->dev, 350 "Master chn_en write failed:%d port:%d\n", 351 ret, t_params->port_num); 352 return ret; 353 } 354 } else { 355 dev_err(bus->dev, 356 "dpn_port_enable_ch not supported, %s failed\n", 357 en ? "enable" : "disable"); 358 return -EINVAL; 359 } 360 361 return 0; 362} 363 364/** 365 * sdw_enable_disable_ports() - Enable/disable port(s) for Master and 366 * Slave(s) 367 * 368 * @m_rt: Master stream runtime 369 * @en: mode (enable/disable) 370 */ 371static int sdw_enable_disable_ports(struct sdw_master_runtime *m_rt, bool en) 372{ 373 struct sdw_port_runtime *s_port, *m_port; 374 struct sdw_slave_runtime *s_rt; 375 int ret = 0; 376 377 /* Enable/Disable Slave port(s) */ 378 list_for_each_entry(s_rt, &m_rt->slave_rt_list, m_rt_node) { 379 list_for_each_entry(s_port, &s_rt->port_list, port_node) { 380 ret = sdw_enable_disable_slave_ports(m_rt->bus, s_rt, 381 s_port, en); 382 if (ret < 0) 383 return ret; 384 } 385 } 386 387 /* Enable/Disable Master port(s) */ 388 list_for_each_entry(m_port, &m_rt->port_list, port_node) { 389 ret = sdw_enable_disable_master_ports(m_rt, m_port, en); 390 if (ret < 0) 391 return ret; 392 } 393 394 return 0; 395} 396 397static int sdw_do_port_prep(struct sdw_slave_runtime *s_rt, 398 struct sdw_prepare_ch prep_ch, 399 enum sdw_port_prep_ops cmd) 400{ 401 const struct sdw_slave_ops *ops = s_rt->slave->ops; 402 int ret; 403 404 if (ops->port_prep) { 405 ret = ops->port_prep(s_rt->slave, &prep_ch, cmd); 406 if (ret < 0) { 407 dev_err(&s_rt->slave->dev, 408 "Slave Port Prep cmd %d failed: %d\n", 409 cmd, ret); 410 return ret; 411 } 412 } 413 414 return 0; 415} 416 417static int sdw_prep_deprep_slave_ports(struct sdw_bus *bus, 418 struct sdw_slave_runtime *s_rt, 419 struct sdw_port_runtime *p_rt, 420 bool prep) 421{ 422 struct completion *port_ready; 423 struct sdw_dpn_prop *dpn_prop; 424 struct sdw_prepare_ch prep_ch; 425 bool intr = false; 426 int ret = 0, val; 427 u32 addr; 428 429 prep_ch.num = p_rt->num; 430 prep_ch.ch_mask = p_rt->ch_mask; 431 432 dpn_prop = sdw_get_slave_dpn_prop(s_rt->slave, 433 s_rt->direction, 434 prep_ch.num); 435 if (!dpn_prop) { 436 dev_err(bus->dev, 437 "Slave Port:%d properties not found\n", prep_ch.num); 438 return -EINVAL; 439 } 440 441 prep_ch.prepare = prep; 442 443 prep_ch.bank = bus->params.next_bank; 444 445 if (dpn_prop->imp_def_interrupts || !dpn_prop->simple_ch_prep_sm || 446 bus->params.s_data_mode != SDW_PORT_DATA_MODE_NORMAL) 447 intr = true; 448 449 /* 450 * Enable interrupt before Port prepare. 451 * For Port de-prepare, it is assumed that port 452 * was prepared earlier 453 */ 454 if (prep && intr) { 455 ret = sdw_configure_dpn_intr(s_rt->slave, p_rt->num, prep, 456 dpn_prop->imp_def_interrupts); 457 if (ret < 0) 458 return ret; 459 } 460 461 /* Inform slave about the impending port prepare */ 462 sdw_do_port_prep(s_rt, prep_ch, SDW_OPS_PORT_PRE_PREP); 463 464 /* Prepare Slave port implementing CP_SM */ 465 if (!dpn_prop->simple_ch_prep_sm) { 466 addr = SDW_DPN_PREPARECTRL(p_rt->num); 467 468 if (prep) 469 ret = sdw_write(s_rt->slave, addr, p_rt->ch_mask); 470 else 471 ret = sdw_write(s_rt->slave, addr, 0x0); 472 473 if (ret < 0) { 474 dev_err(&s_rt->slave->dev, 475 "Slave prep_ctrl reg write failed\n"); 476 return ret; 477 } 478 479 /* Wait for completion on port ready */ 480 port_ready = &s_rt->slave->port_ready[prep_ch.num]; 481 wait_for_completion_timeout(port_ready, 482 msecs_to_jiffies(dpn_prop->ch_prep_timeout)); 483 484 val = sdw_read(s_rt->slave, SDW_DPN_PREPARESTATUS(p_rt->num)); 485 if ((val < 0) || (val & p_rt->ch_mask)) { 486 ret = (val < 0) ? val : -ETIMEDOUT; 487 dev_err(&s_rt->slave->dev, 488 "Chn prep failed for port %d: %d\n", prep_ch.num, ret); 489 return ret; 490 } 491 } 492 493 /* Inform slaves about ports prepared */ 494 sdw_do_port_prep(s_rt, prep_ch, SDW_OPS_PORT_POST_PREP); 495 496 /* Disable interrupt after Port de-prepare */ 497 if (!prep && intr) 498 ret = sdw_configure_dpn_intr(s_rt->slave, p_rt->num, prep, 499 dpn_prop->imp_def_interrupts); 500 501 return ret; 502} 503 504static int sdw_prep_deprep_master_ports(struct sdw_master_runtime *m_rt, 505 struct sdw_port_runtime *p_rt, 506 bool prep) 507{ 508 struct sdw_transport_params *t_params = &p_rt->transport_params; 509 struct sdw_bus *bus = m_rt->bus; 510 const struct sdw_master_port_ops *ops = bus->port_ops; 511 struct sdw_prepare_ch prep_ch; 512 int ret = 0; 513 514 prep_ch.num = p_rt->num; 515 prep_ch.ch_mask = p_rt->ch_mask; 516 prep_ch.prepare = prep; /* Prepare/De-prepare */ 517 prep_ch.bank = bus->params.next_bank; 518 519 /* Pre-prepare/Pre-deprepare port(s) */ 520 if (ops->dpn_port_prep) { 521 ret = ops->dpn_port_prep(bus, &prep_ch); 522 if (ret < 0) { 523 dev_err(bus->dev, "Port prepare failed for port:%d\n", 524 t_params->port_num); 525 return ret; 526 } 527 } 528 529 return ret; 530} 531 532/** 533 * sdw_prep_deprep_ports() - Prepare/De-prepare port(s) for Master(s) and 534 * Slave(s) 535 * 536 * @m_rt: Master runtime handle 537 * @prep: Prepare or De-prepare 538 */ 539static int sdw_prep_deprep_ports(struct sdw_master_runtime *m_rt, bool prep) 540{ 541 struct sdw_slave_runtime *s_rt; 542 struct sdw_port_runtime *p_rt; 543 int ret = 0; 544 545 /* Prepare/De-prepare Slave port(s) */ 546 list_for_each_entry(s_rt, &m_rt->slave_rt_list, m_rt_node) { 547 list_for_each_entry(p_rt, &s_rt->port_list, port_node) { 548 ret = sdw_prep_deprep_slave_ports(m_rt->bus, s_rt, 549 p_rt, prep); 550 if (ret < 0) 551 return ret; 552 } 553 } 554 555 /* Prepare/De-prepare Master port(s) */ 556 list_for_each_entry(p_rt, &m_rt->port_list, port_node) { 557 ret = sdw_prep_deprep_master_ports(m_rt, p_rt, prep); 558 if (ret < 0) 559 return ret; 560 } 561 562 return ret; 563} 564 565/** 566 * sdw_notify_config() - Notify bus configuration 567 * 568 * @m_rt: Master runtime handle 569 * 570 * This function notifies the Master(s) and Slave(s) of the 571 * new bus configuration. 572 */ 573static int sdw_notify_config(struct sdw_master_runtime *m_rt) 574{ 575 struct sdw_slave_runtime *s_rt; 576 struct sdw_bus *bus = m_rt->bus; 577 struct sdw_slave *slave; 578 int ret = 0; 579 580 if (bus->ops->set_bus_conf) { 581 ret = bus->ops->set_bus_conf(bus, &bus->params); 582 if (ret < 0) 583 return ret; 584 } 585 586 list_for_each_entry(s_rt, &m_rt->slave_rt_list, m_rt_node) { 587 slave = s_rt->slave; 588 589 if (slave->ops->bus_config) { 590 ret = slave->ops->bus_config(slave, &bus->params); 591 if (ret < 0) { 592 dev_err(bus->dev, "Notify Slave: %d failed\n", 593 slave->dev_num); 594 return ret; 595 } 596 } 597 } 598 599 return ret; 600} 601 602/** 603 * sdw_program_params() - Program transport and port parameters for Master(s) 604 * and Slave(s) 605 * 606 * @bus: SDW bus instance 607 * @prepare: true if sdw_program_params() is called by _prepare. 608 */ 609static int sdw_program_params(struct sdw_bus *bus, bool prepare) 610{ 611 struct sdw_master_runtime *m_rt; 612 int ret = 0; 613 614 list_for_each_entry(m_rt, &bus->m_rt_list, bus_node) { 615 616 /* 617 * this loop walks through all master runtimes for a 618 * bus, but the ports can only be configured while 619 * explicitly preparing a stream or handling an 620 * already-prepared stream otherwise. 621 */ 622 if (!prepare && 623 m_rt->stream->state == SDW_STREAM_CONFIGURED) 624 continue; 625 626 ret = sdw_program_port_params(m_rt); 627 if (ret < 0) { 628 dev_err(bus->dev, 629 "Program transport params failed: %d\n", ret); 630 return ret; 631 } 632 633 ret = sdw_notify_config(m_rt); 634 if (ret < 0) { 635 dev_err(bus->dev, 636 "Notify bus config failed: %d\n", ret); 637 return ret; 638 } 639 640 /* Enable port(s) on alternate bank for all active streams */ 641 if (m_rt->stream->state != SDW_STREAM_ENABLED) 642 continue; 643 644 ret = sdw_enable_disable_ports(m_rt, true); 645 if (ret < 0) { 646 dev_err(bus->dev, "Enable channel failed: %d\n", ret); 647 return ret; 648 } 649 } 650 651 return ret; 652} 653 654static int sdw_bank_switch(struct sdw_bus *bus, int m_rt_count) 655{ 656 int col_index, row_index; 657 bool multi_link; 658 struct sdw_msg *wr_msg; 659 u8 *wbuf; 660 int ret; 661 u16 addr; 662 663 wr_msg = kzalloc(sizeof(*wr_msg), GFP_KERNEL); 664 if (!wr_msg) 665 return -ENOMEM; 666 667 bus->defer_msg.msg = wr_msg; 668 669 wbuf = kzalloc(sizeof(*wbuf), GFP_KERNEL); 670 if (!wbuf) { 671 ret = -ENOMEM; 672 goto error_1; 673 } 674 675 /* Get row and column index to program register */ 676 col_index = sdw_find_col_index(bus->params.col); 677 row_index = sdw_find_row_index(bus->params.row); 678 wbuf[0] = col_index | (row_index << 3); 679 680 if (bus->params.next_bank) 681 addr = SDW_SCP_FRAMECTRL_B1; 682 else 683 addr = SDW_SCP_FRAMECTRL_B0; 684 685 sdw_fill_msg(wr_msg, NULL, addr, 1, SDW_BROADCAST_DEV_NUM, 686 SDW_MSG_FLAG_WRITE, wbuf); 687 wr_msg->ssp_sync = true; 688 689 /* 690 * Set the multi_link flag only when both the hardware supports 691 * and hardware-based sync is required 692 */ 693 multi_link = bus->multi_link && (m_rt_count >= bus->hw_sync_min_links); 694 695 if (multi_link) 696 ret = sdw_transfer_defer(bus, wr_msg, &bus->defer_msg); 697 else 698 ret = sdw_transfer(bus, wr_msg); 699 700 if (ret < 0) { 701 dev_err(bus->dev, "Slave frame_ctrl reg write failed\n"); 702 goto error; 703 } 704 705 if (!multi_link) { 706 kfree(wr_msg); 707 kfree(wbuf); 708 bus->defer_msg.msg = NULL; 709 bus->params.curr_bank = !bus->params.curr_bank; 710 bus->params.next_bank = !bus->params.next_bank; 711 } 712 713 return 0; 714 715error: 716 kfree(wbuf); 717error_1: 718 kfree(wr_msg); 719 bus->defer_msg.msg = NULL; 720 return ret; 721} 722 723/** 724 * sdw_ml_sync_bank_switch: Multilink register bank switch 725 * 726 * @bus: SDW bus instance 727 * @multi_link: whether this is a multi-link stream with hardware-based sync 728 * 729 * Caller function should free the buffers on error 730 */ 731static int sdw_ml_sync_bank_switch(struct sdw_bus *bus, bool multi_link) 732{ 733 unsigned long time_left; 734 735 if (!multi_link) 736 return 0; 737 738 /* Wait for completion of transfer */ 739 time_left = wait_for_completion_timeout(&bus->defer_msg.complete, 740 bus->bank_switch_timeout); 741 742 if (!time_left) { 743 dev_err(bus->dev, "Controller Timed out on bank switch\n"); 744 return -ETIMEDOUT; 745 } 746 747 bus->params.curr_bank = !bus->params.curr_bank; 748 bus->params.next_bank = !bus->params.next_bank; 749 750 if (bus->defer_msg.msg) { 751 kfree(bus->defer_msg.msg->buf); 752 kfree(bus->defer_msg.msg); 753 } 754 755 return 0; 756} 757 758static int do_bank_switch(struct sdw_stream_runtime *stream) 759{ 760 struct sdw_master_runtime *m_rt; 761 const struct sdw_master_ops *ops; 762 struct sdw_bus *bus; 763 bool multi_link = false; 764 int m_rt_count; 765 int ret = 0; 766 767 m_rt_count = stream->m_rt_count; 768 769 list_for_each_entry(m_rt, &stream->master_list, stream_node) { 770 bus = m_rt->bus; 771 ops = bus->ops; 772 773 if (bus->multi_link && m_rt_count >= bus->hw_sync_min_links) { 774 multi_link = true; 775 mutex_lock(&bus->msg_lock); 776 } 777 778 /* Pre-bank switch */ 779 if (ops->pre_bank_switch) { 780 ret = ops->pre_bank_switch(bus); 781 if (ret < 0) { 782 dev_err(bus->dev, 783 "Pre bank switch op failed: %d\n", ret); 784 goto msg_unlock; 785 } 786 } 787 788 /* 789 * Perform Bank switch operation. 790 * For multi link cases, the actual bank switch is 791 * synchronized across all Masters and happens later as a 792 * part of post_bank_switch ops. 793 */ 794 ret = sdw_bank_switch(bus, m_rt_count); 795 if (ret < 0) { 796 dev_err(bus->dev, "Bank switch failed: %d\n", ret); 797 goto error; 798 } 799 } 800 801 /* 802 * For multi link cases, it is expected that the bank switch is 803 * triggered by the post_bank_switch for the first Master in the list 804 * and for the other Masters the post_bank_switch() should return doing 805 * nothing. 806 */ 807 list_for_each_entry(m_rt, &stream->master_list, stream_node) { 808 bus = m_rt->bus; 809 ops = bus->ops; 810 811 /* Post-bank switch */ 812 if (ops->post_bank_switch) { 813 ret = ops->post_bank_switch(bus); 814 if (ret < 0) { 815 dev_err(bus->dev, 816 "Post bank switch op failed: %d\n", 817 ret); 818 goto error; 819 } 820 } else if (multi_link) { 821 dev_err(bus->dev, 822 "Post bank switch ops not implemented\n"); 823 goto error; 824 } 825 826 /* Set the bank switch timeout to default, if not set */ 827 if (!bus->bank_switch_timeout) 828 bus->bank_switch_timeout = DEFAULT_BANK_SWITCH_TIMEOUT; 829 830 /* Check if bank switch was successful */ 831 ret = sdw_ml_sync_bank_switch(bus, multi_link); 832 if (ret < 0) { 833 dev_err(bus->dev, 834 "multi link bank switch failed: %d\n", ret); 835 goto error; 836 } 837 838 if (multi_link) 839 mutex_unlock(&bus->msg_lock); 840 } 841 842 return ret; 843 844error: 845 list_for_each_entry(m_rt, &stream->master_list, stream_node) { 846 bus = m_rt->bus; 847 if (bus->defer_msg.msg) { 848 kfree(bus->defer_msg.msg->buf); 849 kfree(bus->defer_msg.msg); 850 } 851 } 852 853msg_unlock: 854 855 if (multi_link) { 856 list_for_each_entry(m_rt, &stream->master_list, stream_node) { 857 bus = m_rt->bus; 858 if (mutex_is_locked(&bus->msg_lock)) 859 mutex_unlock(&bus->msg_lock); 860 } 861 } 862 863 return ret; 864} 865 866/** 867 * sdw_release_stream() - Free the assigned stream runtime 868 * 869 * @stream: SoundWire stream runtime 870 * 871 * sdw_release_stream should be called only once per stream 872 */ 873void sdw_release_stream(struct sdw_stream_runtime *stream) 874{ 875 kfree(stream); 876} 877EXPORT_SYMBOL(sdw_release_stream); 878 879/** 880 * sdw_alloc_stream() - Allocate and return stream runtime 881 * 882 * @stream_name: SoundWire stream name 883 * 884 * Allocates a SoundWire stream runtime instance. 885 * sdw_alloc_stream should be called only once per stream. Typically 886 * invoked from ALSA/ASoC machine/platform driver. 887 */ 888struct sdw_stream_runtime *sdw_alloc_stream(const char *stream_name) 889{ 890 struct sdw_stream_runtime *stream; 891 892 stream = kzalloc(sizeof(*stream), GFP_KERNEL); 893 if (!stream) 894 return NULL; 895 896 stream->name = stream_name; 897 INIT_LIST_HEAD(&stream->master_list); 898 stream->state = SDW_STREAM_ALLOCATED; 899 stream->m_rt_count = 0; 900 901 return stream; 902} 903EXPORT_SYMBOL(sdw_alloc_stream); 904 905static struct sdw_master_runtime 906*sdw_find_master_rt(struct sdw_bus *bus, 907 struct sdw_stream_runtime *stream) 908{ 909 struct sdw_master_runtime *m_rt; 910 911 /* Retrieve Bus handle if already available */ 912 list_for_each_entry(m_rt, &stream->master_list, stream_node) { 913 if (m_rt->bus == bus) 914 return m_rt; 915 } 916 917 return NULL; 918} 919 920/** 921 * sdw_alloc_master_rt() - Allocates and initialize Master runtime handle 922 * 923 * @bus: SDW bus instance 924 * @stream_config: Stream configuration 925 * @stream: Stream runtime handle. 926 * 927 * This function is to be called with bus_lock held. 928 */ 929static struct sdw_master_runtime 930*sdw_alloc_master_rt(struct sdw_bus *bus, 931 struct sdw_stream_config *stream_config, 932 struct sdw_stream_runtime *stream) 933{ 934 struct sdw_master_runtime *m_rt; 935 936 /* 937 * check if Master is already allocated (as a result of Slave adding 938 * it first), if so skip allocation and go to configure 939 */ 940 m_rt = sdw_find_master_rt(bus, stream); 941 if (m_rt) 942 goto stream_config; 943 944 m_rt = kzalloc(sizeof(*m_rt), GFP_KERNEL); 945 if (!m_rt) 946 return NULL; 947 948 /* Initialization of Master runtime handle */ 949 INIT_LIST_HEAD(&m_rt->port_list); 950 INIT_LIST_HEAD(&m_rt->slave_rt_list); 951 list_add_tail(&m_rt->stream_node, &stream->master_list); 952 953 list_add_tail(&m_rt->bus_node, &bus->m_rt_list); 954 955stream_config: 956 m_rt->ch_count = stream_config->ch_count; 957 m_rt->bus = bus; 958 m_rt->stream = stream; 959 m_rt->direction = stream_config->direction; 960 961 return m_rt; 962} 963 964/** 965 * sdw_alloc_slave_rt() - Allocate and initialize Slave runtime handle. 966 * 967 * @slave: Slave handle 968 * @stream_config: Stream configuration 969 * @stream: Stream runtime handle 970 * 971 * This function is to be called with bus_lock held. 972 */ 973static struct sdw_slave_runtime 974*sdw_alloc_slave_rt(struct sdw_slave *slave, 975 struct sdw_stream_config *stream_config, 976 struct sdw_stream_runtime *stream) 977{ 978 struct sdw_slave_runtime *s_rt; 979 980 s_rt = kzalloc(sizeof(*s_rt), GFP_KERNEL); 981 if (!s_rt) 982 return NULL; 983 984 INIT_LIST_HEAD(&s_rt->port_list); 985 s_rt->ch_count = stream_config->ch_count; 986 s_rt->direction = stream_config->direction; 987 s_rt->slave = slave; 988 989 return s_rt; 990} 991 992static void sdw_master_port_release(struct sdw_bus *bus, 993 struct sdw_master_runtime *m_rt) 994{ 995 struct sdw_port_runtime *p_rt, *_p_rt; 996 997 list_for_each_entry_safe(p_rt, _p_rt, &m_rt->port_list, port_node) { 998 list_del(&p_rt->port_node); 999 kfree(p_rt); 1000 } 1001} 1002 1003static void sdw_slave_port_release(struct sdw_bus *bus, 1004 struct sdw_slave *slave, 1005 struct sdw_stream_runtime *stream) 1006{ 1007 struct sdw_port_runtime *p_rt, *_p_rt; 1008 struct sdw_master_runtime *m_rt; 1009 struct sdw_slave_runtime *s_rt; 1010 1011 list_for_each_entry(m_rt, &stream->master_list, stream_node) { 1012 list_for_each_entry(s_rt, &m_rt->slave_rt_list, m_rt_node) { 1013 if (s_rt->slave != slave) 1014 continue; 1015 1016 list_for_each_entry_safe(p_rt, _p_rt, 1017 &s_rt->port_list, port_node) { 1018 list_del(&p_rt->port_node); 1019 kfree(p_rt); 1020 } 1021 } 1022 } 1023} 1024 1025/** 1026 * sdw_release_slave_stream() - Free Slave(s) runtime handle 1027 * 1028 * @slave: Slave handle. 1029 * @stream: Stream runtime handle. 1030 * 1031 * This function is to be called with bus_lock held. 1032 */ 1033static void sdw_release_slave_stream(struct sdw_slave *slave, 1034 struct sdw_stream_runtime *stream) 1035{ 1036 struct sdw_slave_runtime *s_rt, *_s_rt; 1037 struct sdw_master_runtime *m_rt; 1038 1039 list_for_each_entry(m_rt, &stream->master_list, stream_node) { 1040 /* Retrieve Slave runtime handle */ 1041 list_for_each_entry_safe(s_rt, _s_rt, 1042 &m_rt->slave_rt_list, m_rt_node) { 1043 if (s_rt->slave == slave) { 1044 list_del(&s_rt->m_rt_node); 1045 kfree(s_rt); 1046 return; 1047 } 1048 } 1049 } 1050} 1051 1052/** 1053 * sdw_release_master_stream() - Free Master runtime handle 1054 * 1055 * @m_rt: Master runtime node 1056 * @stream: Stream runtime handle. 1057 * 1058 * This function is to be called with bus_lock held 1059 * It frees the Master runtime handle and associated Slave(s) runtime 1060 * handle. If this is called first then sdw_release_slave_stream() will have 1061 * no effect as Slave(s) runtime handle would already be freed up. 1062 */ 1063static void sdw_release_master_stream(struct sdw_master_runtime *m_rt, 1064 struct sdw_stream_runtime *stream) 1065{ 1066 struct sdw_slave_runtime *s_rt, *_s_rt; 1067 1068 list_for_each_entry_safe(s_rt, _s_rt, &m_rt->slave_rt_list, m_rt_node) { 1069 sdw_slave_port_release(s_rt->slave->bus, s_rt->slave, stream); 1070 sdw_release_slave_stream(s_rt->slave, stream); 1071 } 1072 1073 list_del(&m_rt->stream_node); 1074 list_del(&m_rt->bus_node); 1075 kfree(m_rt); 1076} 1077 1078/** 1079 * sdw_stream_remove_master() - Remove master from sdw_stream 1080 * 1081 * @bus: SDW Bus instance 1082 * @stream: SoundWire stream 1083 * 1084 * This removes and frees port_rt and master_rt from a stream 1085 */ 1086int sdw_stream_remove_master(struct sdw_bus *bus, 1087 struct sdw_stream_runtime *stream) 1088{ 1089 struct sdw_master_runtime *m_rt, *_m_rt; 1090 1091 mutex_lock(&bus->bus_lock); 1092 1093 list_for_each_entry_safe(m_rt, _m_rt, 1094 &stream->master_list, stream_node) { 1095 if (m_rt->bus != bus) 1096 continue; 1097 1098 sdw_master_port_release(bus, m_rt); 1099 sdw_release_master_stream(m_rt, stream); 1100 stream->m_rt_count--; 1101 } 1102 1103 if (list_empty(&stream->master_list)) 1104 stream->state = SDW_STREAM_RELEASED; 1105 1106 mutex_unlock(&bus->bus_lock); 1107 1108 return 0; 1109} 1110EXPORT_SYMBOL(sdw_stream_remove_master); 1111 1112/** 1113 * sdw_stream_remove_slave() - Remove slave from sdw_stream 1114 * 1115 * @slave: SDW Slave instance 1116 * @stream: SoundWire stream 1117 * 1118 * This removes and frees port_rt and slave_rt from a stream 1119 */ 1120int sdw_stream_remove_slave(struct sdw_slave *slave, 1121 struct sdw_stream_runtime *stream) 1122{ 1123 mutex_lock(&slave->bus->bus_lock); 1124 1125 sdw_slave_port_release(slave->bus, slave, stream); 1126 sdw_release_slave_stream(slave, stream); 1127 1128 mutex_unlock(&slave->bus->bus_lock); 1129 1130 return 0; 1131} 1132EXPORT_SYMBOL(sdw_stream_remove_slave); 1133 1134/** 1135 * sdw_config_stream() - Configure the allocated stream 1136 * 1137 * @dev: SDW device 1138 * @stream: SoundWire stream 1139 * @stream_config: Stream configuration for audio stream 1140 * @is_slave: is API called from Slave or Master 1141 * 1142 * This function is to be called with bus_lock held. 1143 */ 1144static int sdw_config_stream(struct device *dev, 1145 struct sdw_stream_runtime *stream, 1146 struct sdw_stream_config *stream_config, 1147 bool is_slave) 1148{ 1149 /* 1150 * Update the stream rate, channel and bps based on data 1151 * source. For more than one data source (multilink), 1152 * match the rate, bps, stream type and increment number of channels. 1153 * 1154 * If rate/bps is zero, it means the values are not set, so skip 1155 * comparison and allow the value to be set and stored in stream 1156 */ 1157 if (stream->params.rate && 1158 stream->params.rate != stream_config->frame_rate) { 1159 dev_err(dev, "rate not matching, stream:%s\n", stream->name); 1160 return -EINVAL; 1161 } 1162 1163 if (stream->params.bps && 1164 stream->params.bps != stream_config->bps) { 1165 dev_err(dev, "bps not matching, stream:%s\n", stream->name); 1166 return -EINVAL; 1167 } 1168 1169 stream->type = stream_config->type; 1170 stream->params.rate = stream_config->frame_rate; 1171 stream->params.bps = stream_config->bps; 1172 1173 /* TODO: Update this check during Device-device support */ 1174 if (is_slave) 1175 stream->params.ch_count += stream_config->ch_count; 1176 1177 return 0; 1178} 1179 1180static int sdw_is_valid_port_range(struct device *dev, 1181 struct sdw_port_runtime *p_rt) 1182{ 1183 if (!SDW_VALID_PORT_RANGE(p_rt->num)) { 1184 dev_err(dev, 1185 "SoundWire: Invalid port number :%d\n", p_rt->num); 1186 return -EINVAL; 1187 } 1188 1189 return 0; 1190} 1191 1192static struct sdw_port_runtime 1193*sdw_port_alloc(struct device *dev, 1194 struct sdw_port_config *port_config, 1195 int port_index) 1196{ 1197 struct sdw_port_runtime *p_rt; 1198 1199 p_rt = kzalloc(sizeof(*p_rt), GFP_KERNEL); 1200 if (!p_rt) 1201 return NULL; 1202 1203 p_rt->ch_mask = port_config[port_index].ch_mask; 1204 p_rt->num = port_config[port_index].num; 1205 1206 return p_rt; 1207} 1208 1209static int sdw_master_port_config(struct sdw_bus *bus, 1210 struct sdw_master_runtime *m_rt, 1211 struct sdw_port_config *port_config, 1212 unsigned int num_ports) 1213{ 1214 struct sdw_port_runtime *p_rt; 1215 int i; 1216 1217 /* Iterate for number of ports to perform initialization */ 1218 for (i = 0; i < num_ports; i++) { 1219 p_rt = sdw_port_alloc(bus->dev, port_config, i); 1220 if (!p_rt) 1221 return -ENOMEM; 1222 1223 /* 1224 * TODO: Check port capabilities for requested 1225 * configuration (audio mode support) 1226 */ 1227 1228 list_add_tail(&p_rt->port_node, &m_rt->port_list); 1229 } 1230 1231 return 0; 1232} 1233 1234static int sdw_slave_port_config(struct sdw_slave *slave, 1235 struct sdw_slave_runtime *s_rt, 1236 struct sdw_port_config *port_config, 1237 unsigned int num_config) 1238{ 1239 struct sdw_port_runtime *p_rt; 1240 int i, ret; 1241 1242 /* Iterate for number of ports to perform initialization */ 1243 for (i = 0; i < num_config; i++) { 1244 p_rt = sdw_port_alloc(&slave->dev, port_config, i); 1245 if (!p_rt) 1246 return -ENOMEM; 1247 1248 /* 1249 * TODO: Check valid port range as defined by DisCo/ 1250 * slave 1251 */ 1252 ret = sdw_is_valid_port_range(&slave->dev, p_rt); 1253 if (ret < 0) { 1254 kfree(p_rt); 1255 return ret; 1256 } 1257 1258 /* 1259 * TODO: Check port capabilities for requested 1260 * configuration (audio mode support) 1261 */ 1262 1263 list_add_tail(&p_rt->port_node, &s_rt->port_list); 1264 } 1265 1266 return 0; 1267} 1268 1269/** 1270 * sdw_stream_add_master() - Allocate and add master runtime to a stream 1271 * 1272 * @bus: SDW Bus instance 1273 * @stream_config: Stream configuration for audio stream 1274 * @port_config: Port configuration for audio stream 1275 * @num_ports: Number of ports 1276 * @stream: SoundWire stream 1277 */ 1278int sdw_stream_add_master(struct sdw_bus *bus, 1279 struct sdw_stream_config *stream_config, 1280 struct sdw_port_config *port_config, 1281 unsigned int num_ports, 1282 struct sdw_stream_runtime *stream) 1283{ 1284 struct sdw_master_runtime *m_rt; 1285 int ret; 1286 1287 mutex_lock(&bus->bus_lock); 1288 1289 /* 1290 * For multi link streams, add the second master only if 1291 * the bus supports it. 1292 * Check if bus->multi_link is set 1293 */ 1294 if (!bus->multi_link && stream->m_rt_count > 0) { 1295 dev_err(bus->dev, 1296 "Multilink not supported, link %d\n", bus->link_id); 1297 ret = -EINVAL; 1298 goto unlock; 1299 } 1300 1301 m_rt = sdw_alloc_master_rt(bus, stream_config, stream); 1302 if (!m_rt) { 1303 dev_err(bus->dev, 1304 "Master runtime config failed for stream:%s\n", 1305 stream->name); 1306 ret = -ENOMEM; 1307 goto unlock; 1308 } 1309 1310 ret = sdw_config_stream(bus->dev, stream, stream_config, false); 1311 if (ret) 1312 goto stream_error; 1313 1314 ret = sdw_master_port_config(bus, m_rt, port_config, num_ports); 1315 if (ret) 1316 goto stream_error; 1317 1318 stream->m_rt_count++; 1319 1320 goto unlock; 1321 1322stream_error: 1323 sdw_release_master_stream(m_rt, stream); 1324unlock: 1325 mutex_unlock(&bus->bus_lock); 1326 return ret; 1327} 1328EXPORT_SYMBOL(sdw_stream_add_master); 1329 1330/** 1331 * sdw_stream_add_slave() - Allocate and add master/slave runtime to a stream 1332 * 1333 * @slave: SDW Slave instance 1334 * @stream_config: Stream configuration for audio stream 1335 * @stream: SoundWire stream 1336 * @port_config: Port configuration for audio stream 1337 * @num_ports: Number of ports 1338 * 1339 * It is expected that Slave is added before adding Master 1340 * to the Stream. 1341 * 1342 */ 1343int sdw_stream_add_slave(struct sdw_slave *slave, 1344 struct sdw_stream_config *stream_config, 1345 struct sdw_port_config *port_config, 1346 unsigned int num_ports, 1347 struct sdw_stream_runtime *stream) 1348{ 1349 struct sdw_slave_runtime *s_rt; 1350 struct sdw_master_runtime *m_rt; 1351 int ret; 1352 1353 mutex_lock(&slave->bus->bus_lock); 1354 1355 /* 1356 * If this API is invoked by Slave first then m_rt is not valid. 1357 * So, allocate m_rt and add Slave to it. 1358 */ 1359 m_rt = sdw_alloc_master_rt(slave->bus, stream_config, stream); 1360 if (!m_rt) { 1361 dev_err(&slave->dev, 1362 "alloc master runtime failed for stream:%s\n", 1363 stream->name); 1364 ret = -ENOMEM; 1365 goto error; 1366 } 1367 1368 s_rt = sdw_alloc_slave_rt(slave, stream_config, stream); 1369 if (!s_rt) { 1370 dev_err(&slave->dev, 1371 "Slave runtime config failed for stream:%s\n", 1372 stream->name); 1373 ret = -ENOMEM; 1374 goto stream_error; 1375 } 1376 1377 ret = sdw_config_stream(&slave->dev, stream, stream_config, true); 1378 if (ret) { 1379 /* 1380 * sdw_release_master_stream will release s_rt in slave_rt_list in 1381 * stream_error case, but s_rt is only added to slave_rt_list 1382 * when sdw_config_stream is successful, so free s_rt explicitly 1383 * when sdw_config_stream is failed. 1384 */ 1385 kfree(s_rt); 1386 goto stream_error; 1387 } 1388 1389 list_add_tail(&s_rt->m_rt_node, &m_rt->slave_rt_list); 1390 1391 ret = sdw_slave_port_config(slave, s_rt, port_config, num_ports); 1392 if (ret) 1393 goto stream_error; 1394 1395 /* 1396 * Change stream state to CONFIGURED on first Slave add. 1397 * Bus is not aware of number of Slave(s) in a stream at this 1398 * point so cannot depend on all Slave(s) to be added in order to 1399 * change stream state to CONFIGURED. 1400 */ 1401 stream->state = SDW_STREAM_CONFIGURED; 1402 goto error; 1403 1404stream_error: 1405 /* 1406 * we hit error so cleanup the stream, release all Slave(s) and 1407 * Master runtime 1408 */ 1409 sdw_release_master_stream(m_rt, stream); 1410error: 1411 mutex_unlock(&slave->bus->bus_lock); 1412 return ret; 1413} 1414EXPORT_SYMBOL(sdw_stream_add_slave); 1415 1416/** 1417 * sdw_get_slave_dpn_prop() - Get Slave port capabilities 1418 * 1419 * @slave: Slave handle 1420 * @direction: Data direction. 1421 * @port_num: Port number 1422 */ 1423struct sdw_dpn_prop *sdw_get_slave_dpn_prop(struct sdw_slave *slave, 1424 enum sdw_data_direction direction, 1425 unsigned int port_num) 1426{ 1427 struct sdw_dpn_prop *dpn_prop; 1428 u8 num_ports; 1429 int i; 1430 1431 if (direction == SDW_DATA_DIR_TX) { 1432 num_ports = hweight32(slave->prop.source_ports); 1433 dpn_prop = slave->prop.src_dpn_prop; 1434 } else { 1435 num_ports = hweight32(slave->prop.sink_ports); 1436 dpn_prop = slave->prop.sink_dpn_prop; 1437 } 1438 1439 for (i = 0; i < num_ports; i++) { 1440 if (dpn_prop[i].num == port_num) 1441 return &dpn_prop[i]; 1442 } 1443 1444 return NULL; 1445} 1446 1447/** 1448 * sdw_acquire_bus_lock: Acquire bus lock for all Master runtime(s) 1449 * 1450 * @stream: SoundWire stream 1451 * 1452 * Acquire bus_lock for each of the master runtime(m_rt) part of this 1453 * stream to reconfigure the bus. 1454 * NOTE: This function is called from SoundWire stream ops and is 1455 * expected that a global lock is held before acquiring bus_lock. 1456 */ 1457static void sdw_acquire_bus_lock(struct sdw_stream_runtime *stream) 1458{ 1459 struct sdw_master_runtime *m_rt; 1460 struct sdw_bus *bus = NULL; 1461 1462 /* Iterate for all Master(s) in Master list */ 1463 list_for_each_entry(m_rt, &stream->master_list, stream_node) { 1464 bus = m_rt->bus; 1465 1466 mutex_lock(&bus->bus_lock); 1467 } 1468} 1469 1470/** 1471 * sdw_release_bus_lock: Release bus lock for all Master runtime(s) 1472 * 1473 * @stream: SoundWire stream 1474 * 1475 * Release the previously held bus_lock after reconfiguring the bus. 1476 * NOTE: This function is called from SoundWire stream ops and is 1477 * expected that a global lock is held before releasing bus_lock. 1478 */ 1479static void sdw_release_bus_lock(struct sdw_stream_runtime *stream) 1480{ 1481 struct sdw_master_runtime *m_rt = NULL; 1482 struct sdw_bus *bus = NULL; 1483 1484 /* Iterate for all Master(s) in Master list */ 1485 list_for_each_entry_reverse(m_rt, &stream->master_list, stream_node) { 1486 bus = m_rt->bus; 1487 mutex_unlock(&bus->bus_lock); 1488 } 1489} 1490 1491static int _sdw_prepare_stream(struct sdw_stream_runtime *stream, 1492 bool update_params) 1493{ 1494 struct sdw_master_runtime *m_rt; 1495 struct sdw_bus *bus = NULL; 1496 struct sdw_master_prop *prop; 1497 struct sdw_bus_params params; 1498 int ret; 1499 1500 /* Prepare Master(s) and Slave(s) port(s) associated with stream */ 1501 list_for_each_entry(m_rt, &stream->master_list, stream_node) { 1502 bus = m_rt->bus; 1503 prop = &bus->prop; 1504 memcpy(¶ms, &bus->params, sizeof(params)); 1505 1506 /* TODO: Support Asynchronous mode */ 1507 if ((prop->max_clk_freq % stream->params.rate) != 0) { 1508 dev_err(bus->dev, "Async mode not supported\n"); 1509 return -EINVAL; 1510 } 1511 1512 if (!update_params) 1513 goto program_params; 1514 1515 /* Increment cumulative bus bandwidth */ 1516 /* TODO: Update this during Device-Device support */ 1517 bus->params.bandwidth += m_rt->stream->params.rate * 1518 m_rt->ch_count * m_rt->stream->params.bps; 1519 1520 /* Compute params */ 1521 if (bus->compute_params) { 1522 ret = bus->compute_params(bus); 1523 if (ret < 0) { 1524 dev_err(bus->dev, "Compute params failed: %d", 1525 ret); 1526 return ret; 1527 } 1528 } 1529 1530program_params: 1531 /* Program params */ 1532 ret = sdw_program_params(bus, true); 1533 if (ret < 0) { 1534 dev_err(bus->dev, "Program params failed: %d\n", ret); 1535 goto restore_params; 1536 } 1537 } 1538 1539 if (!bus) { 1540 pr_err("Configuration error in %s\n", __func__); 1541 return -EINVAL; 1542 } 1543 1544 ret = do_bank_switch(stream); 1545 if (ret < 0) { 1546 dev_err(bus->dev, "Bank switch failed: %d\n", ret); 1547 goto restore_params; 1548 } 1549 1550 list_for_each_entry(m_rt, &stream->master_list, stream_node) { 1551 bus = m_rt->bus; 1552 1553 /* Prepare port(s) on the new clock configuration */ 1554 ret = sdw_prep_deprep_ports(m_rt, true); 1555 if (ret < 0) { 1556 dev_err(bus->dev, "Prepare port(s) failed ret = %d\n", 1557 ret); 1558 return ret; 1559 } 1560 } 1561 1562 stream->state = SDW_STREAM_PREPARED; 1563 1564 return ret; 1565 1566restore_params: 1567 memcpy(&bus->params, ¶ms, sizeof(params)); 1568 return ret; 1569} 1570 1571/** 1572 * sdw_prepare_stream() - Prepare SoundWire stream 1573 * 1574 * @stream: Soundwire stream 1575 * 1576 * Documentation/driver-api/soundwire/stream.rst explains this API in detail 1577 */ 1578int sdw_prepare_stream(struct sdw_stream_runtime *stream) 1579{ 1580 bool update_params = true; 1581 int ret; 1582 1583 if (!stream) { 1584 pr_err("SoundWire: Handle not found for stream\n"); 1585 return -EINVAL; 1586 } 1587 1588 sdw_acquire_bus_lock(stream); 1589 1590 if (stream->state == SDW_STREAM_PREPARED) { 1591 ret = 0; 1592 goto state_err; 1593 } 1594 1595 if (stream->state != SDW_STREAM_CONFIGURED && 1596 stream->state != SDW_STREAM_DEPREPARED && 1597 stream->state != SDW_STREAM_DISABLED) { 1598 pr_err("%s: %s: inconsistent state state %d\n", 1599 __func__, stream->name, stream->state); 1600 ret = -EINVAL; 1601 goto state_err; 1602 } 1603 1604 /* 1605 * when the stream is DISABLED, this means sdw_prepare_stream() 1606 * is called as a result of an underflow or a resume operation. 1607 * In this case, the bus parameters shall not be recomputed, but 1608 * still need to be re-applied 1609 */ 1610 if (stream->state == SDW_STREAM_DISABLED) 1611 update_params = false; 1612 1613 ret = _sdw_prepare_stream(stream, update_params); 1614 1615state_err: 1616 sdw_release_bus_lock(stream); 1617 return ret; 1618} 1619EXPORT_SYMBOL(sdw_prepare_stream); 1620 1621static int _sdw_enable_stream(struct sdw_stream_runtime *stream) 1622{ 1623 struct sdw_master_runtime *m_rt; 1624 struct sdw_bus *bus = NULL; 1625 int ret; 1626 1627 /* Enable Master(s) and Slave(s) port(s) associated with stream */ 1628 list_for_each_entry(m_rt, &stream->master_list, stream_node) { 1629 bus = m_rt->bus; 1630 1631 /* Program params */ 1632 ret = sdw_program_params(bus, false); 1633 if (ret < 0) { 1634 dev_err(bus->dev, "Program params failed: %d\n", ret); 1635 return ret; 1636 } 1637 1638 /* Enable port(s) */ 1639 ret = sdw_enable_disable_ports(m_rt, true); 1640 if (ret < 0) { 1641 dev_err(bus->dev, 1642 "Enable port(s) failed ret: %d\n", ret); 1643 return ret; 1644 } 1645 } 1646 1647 if (!bus) { 1648 pr_err("Configuration error in %s\n", __func__); 1649 return -EINVAL; 1650 } 1651 1652 ret = do_bank_switch(stream); 1653 if (ret < 0) { 1654 dev_err(bus->dev, "Bank switch failed: %d\n", ret); 1655 return ret; 1656 } 1657 1658 stream->state = SDW_STREAM_ENABLED; 1659 return 0; 1660} 1661 1662/** 1663 * sdw_enable_stream() - Enable SoundWire stream 1664 * 1665 * @stream: Soundwire stream 1666 * 1667 * Documentation/driver-api/soundwire/stream.rst explains this API in detail 1668 */ 1669int sdw_enable_stream(struct sdw_stream_runtime *stream) 1670{ 1671 int ret; 1672 1673 if (!stream) { 1674 pr_err("SoundWire: Handle not found for stream\n"); 1675 return -EINVAL; 1676 } 1677 1678 sdw_acquire_bus_lock(stream); 1679 1680 if (stream->state != SDW_STREAM_PREPARED && 1681 stream->state != SDW_STREAM_DISABLED) { 1682 pr_err("%s: %s: inconsistent state state %d\n", 1683 __func__, stream->name, stream->state); 1684 ret = -EINVAL; 1685 goto state_err; 1686 } 1687 1688 ret = _sdw_enable_stream(stream); 1689 1690state_err: 1691 sdw_release_bus_lock(stream); 1692 return ret; 1693} 1694EXPORT_SYMBOL(sdw_enable_stream); 1695 1696static int _sdw_disable_stream(struct sdw_stream_runtime *stream) 1697{ 1698 struct sdw_master_runtime *m_rt; 1699 int ret; 1700 1701 list_for_each_entry(m_rt, &stream->master_list, stream_node) { 1702 struct sdw_bus *bus = m_rt->bus; 1703 1704 /* Disable port(s) */ 1705 ret = sdw_enable_disable_ports(m_rt, false); 1706 if (ret < 0) { 1707 dev_err(bus->dev, "Disable port(s) failed: %d\n", ret); 1708 return ret; 1709 } 1710 } 1711 stream->state = SDW_STREAM_DISABLED; 1712 1713 list_for_each_entry(m_rt, &stream->master_list, stream_node) { 1714 struct sdw_bus *bus = m_rt->bus; 1715 1716 /* Program params */ 1717 ret = sdw_program_params(bus, false); 1718 if (ret < 0) { 1719 dev_err(bus->dev, "Program params failed: %d\n", ret); 1720 return ret; 1721 } 1722 } 1723 1724 ret = do_bank_switch(stream); 1725 if (ret < 0) { 1726 pr_err("Bank switch failed: %d\n", ret); 1727 return ret; 1728 } 1729 1730 /* make sure alternate bank (previous current) is also disabled */ 1731 list_for_each_entry(m_rt, &stream->master_list, stream_node) { 1732 struct sdw_bus *bus = m_rt->bus; 1733 1734 /* Disable port(s) */ 1735 ret = sdw_enable_disable_ports(m_rt, false); 1736 if (ret < 0) { 1737 dev_err(bus->dev, "Disable port(s) failed: %d\n", ret); 1738 return ret; 1739 } 1740 } 1741 1742 return 0; 1743} 1744 1745/** 1746 * sdw_disable_stream() - Disable SoundWire stream 1747 * 1748 * @stream: Soundwire stream 1749 * 1750 * Documentation/driver-api/soundwire/stream.rst explains this API in detail 1751 */ 1752int sdw_disable_stream(struct sdw_stream_runtime *stream) 1753{ 1754 int ret; 1755 1756 if (!stream) { 1757 pr_err("SoundWire: Handle not found for stream\n"); 1758 return -EINVAL; 1759 } 1760 1761 sdw_acquire_bus_lock(stream); 1762 1763 if (stream->state != SDW_STREAM_ENABLED) { 1764 pr_err("%s: %s: inconsistent state state %d\n", 1765 __func__, stream->name, stream->state); 1766 ret = -EINVAL; 1767 goto state_err; 1768 } 1769 1770 ret = _sdw_disable_stream(stream); 1771 1772state_err: 1773 sdw_release_bus_lock(stream); 1774 return ret; 1775} 1776EXPORT_SYMBOL(sdw_disable_stream); 1777 1778static int _sdw_deprepare_stream(struct sdw_stream_runtime *stream) 1779{ 1780 struct sdw_master_runtime *m_rt; 1781 struct sdw_bus *bus; 1782 int ret = 0; 1783 1784 list_for_each_entry(m_rt, &stream->master_list, stream_node) { 1785 bus = m_rt->bus; 1786 /* De-prepare port(s) */ 1787 ret = sdw_prep_deprep_ports(m_rt, false); 1788 if (ret < 0) { 1789 dev_err(bus->dev, 1790 "De-prepare port(s) failed: %d\n", ret); 1791 return ret; 1792 } 1793 1794 /* TODO: Update this during Device-Device support */ 1795 bus->params.bandwidth -= m_rt->stream->params.rate * 1796 m_rt->ch_count * m_rt->stream->params.bps; 1797 1798 /* Compute params */ 1799 if (bus->compute_params) { 1800 ret = bus->compute_params(bus); 1801 if (ret < 0) { 1802 dev_err(bus->dev, "Compute params failed: %d", 1803 ret); 1804 return ret; 1805 } 1806 } 1807 1808 /* Program params */ 1809 ret = sdw_program_params(bus, false); 1810 if (ret < 0) { 1811 dev_err(bus->dev, "Program params failed: %d\n", ret); 1812 return ret; 1813 } 1814 } 1815 1816 stream->state = SDW_STREAM_DEPREPARED; 1817 return do_bank_switch(stream); 1818} 1819 1820/** 1821 * sdw_deprepare_stream() - Deprepare SoundWire stream 1822 * 1823 * @stream: Soundwire stream 1824 * 1825 * Documentation/driver-api/soundwire/stream.rst explains this API in detail 1826 */ 1827int sdw_deprepare_stream(struct sdw_stream_runtime *stream) 1828{ 1829 int ret; 1830 1831 if (!stream) { 1832 pr_err("SoundWire: Handle not found for stream\n"); 1833 return -EINVAL; 1834 } 1835 1836 sdw_acquire_bus_lock(stream); 1837 1838 if (stream->state != SDW_STREAM_PREPARED && 1839 stream->state != SDW_STREAM_DISABLED) { 1840 pr_err("%s: %s: inconsistent state state %d\n", 1841 __func__, stream->name, stream->state); 1842 ret = -EINVAL; 1843 goto state_err; 1844 } 1845 1846 ret = _sdw_deprepare_stream(stream); 1847 1848state_err: 1849 sdw_release_bus_lock(stream); 1850 return ret; 1851} 1852EXPORT_SYMBOL(sdw_deprepare_stream); 1853 1854static int set_stream(struct snd_pcm_substream *substream, 1855 struct sdw_stream_runtime *sdw_stream) 1856{ 1857 struct snd_soc_pcm_runtime *rtd = substream->private_data; 1858 struct snd_soc_dai *dai; 1859 int ret = 0; 1860 int i; 1861 1862 /* Set stream pointer on all DAIs */ 1863 for_each_rtd_dais(rtd, i, dai) { 1864 ret = snd_soc_dai_set_stream(dai, sdw_stream, substream->stream); 1865 if (ret < 0) { 1866 dev_err(rtd->dev, "failed to set stream pointer on dai %s", dai->name); 1867 break; 1868 } 1869 } 1870 1871 return ret; 1872} 1873 1874/** 1875 * sdw_startup_stream() - Startup SoundWire stream 1876 * 1877 * @sdw_substream: Soundwire stream 1878 * 1879 * Documentation/driver-api/soundwire/stream.rst explains this API in detail 1880 */ 1881int sdw_startup_stream(void *sdw_substream) 1882{ 1883 struct snd_pcm_substream *substream = sdw_substream; 1884 struct snd_soc_pcm_runtime *rtd = substream->private_data; 1885 struct sdw_stream_runtime *sdw_stream; 1886 char *name; 1887 int ret; 1888 1889 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) 1890 name = kasprintf(GFP_KERNEL, "%s-Playback", substream->name); 1891 else 1892 name = kasprintf(GFP_KERNEL, "%s-Capture", substream->name); 1893 1894 if (!name) 1895 return -ENOMEM; 1896 1897 sdw_stream = sdw_alloc_stream(name); 1898 if (!sdw_stream) { 1899 dev_err(rtd->dev, "alloc stream failed for substream DAI %s", substream->name); 1900 ret = -ENOMEM; 1901 goto error; 1902 } 1903 1904 ret = set_stream(substream, sdw_stream); 1905 if (ret < 0) 1906 goto release_stream; 1907 return 0; 1908 1909release_stream: 1910 sdw_release_stream(sdw_stream); 1911 set_stream(substream, NULL); 1912error: 1913 kfree(name); 1914 return ret; 1915} 1916EXPORT_SYMBOL(sdw_startup_stream); 1917 1918/** 1919 * sdw_shutdown_stream() - Shutdown SoundWire stream 1920 * 1921 * @sdw_substream: Soundwire stream 1922 * 1923 * Documentation/driver-api/soundwire/stream.rst explains this API in detail 1924 */ 1925void sdw_shutdown_stream(void *sdw_substream) 1926{ 1927 struct snd_pcm_substream *substream = sdw_substream; 1928 struct snd_soc_pcm_runtime *rtd = substream->private_data; 1929 struct sdw_stream_runtime *sdw_stream; 1930 struct snd_soc_dai *dai; 1931 1932 /* Find stream from first CPU DAI */ 1933 dai = asoc_rtd_to_cpu(rtd, 0); 1934 1935 sdw_stream = snd_soc_dai_get_stream(dai, substream->stream); 1936 1937 if (IS_ERR(sdw_stream)) { 1938 dev_err(rtd->dev, "no stream found for DAI %s", dai->name); 1939 return; 1940 } 1941 1942 /* release memory */ 1943 kfree(sdw_stream->name); 1944 sdw_release_stream(sdw_stream); 1945 1946 /* clear DAI data */ 1947 set_stream(substream, NULL); 1948} 1949EXPORT_SYMBOL(sdw_shutdown_stream); 1950