drivers/soundwire/stream.c

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