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 <linux/soundwire/sdw_type.h>
  17 #include <sound/soc.h>
  18 #include "bus.h"
  19
  20 /*
  21  * Array of supported rows and columns as per MIPI SoundWire Specification 1.1
  22  *
  23  * The rows are arranged as per the array index value programmed
  24  * in register. The index 15 has dummy value 0 in order to fill hole.
  25  */
  26 int sdw_rows[SDW_FRAME_ROWS] = {48, 50, 60, 64, 75, 80, 125, 147,
  27                         96, 100, 120, 128, 150, 160, 250, 0,
  28                         192, 200, 240, 256, 72, 144, 90, 180};
  29 EXPORT_SYMBOL(sdw_rows);
  30
  31 int sdw_cols[SDW_FRAME_COLS] = {2, 4, 6, 8, 10, 12, 14, 16};
  32 EXPORT_SYMBOL(sdw_cols);
  33
  34 int sdw_find_col_index(int col)
  35 {
  36         int i;
  37
  38         for (i = 0; i < SDW_FRAME_COLS; i++) {
  39                 if (sdw_cols[i] == col)
  40                         return i;
  41         }
  42
  43         pr_warn("Requested column not found, selecting lowest column no: 2\n");
  44         return 0;
  45 }
  46 EXPORT_SYMBOL(sdw_find_col_index);
  47
  48 int sdw_find_row_index(int row)
  49 {
  50         int i;
  51
  52         for (i = 0; i < SDW_FRAME_ROWS; i++) {
  53                 if (sdw_rows[i] == row)
  54                         return i;
  55         }
  56
  57         pr_warn("Requested row not found, selecting lowest row no: 48\n");
  58         return 0;
  59 }
  60 EXPORT_SYMBOL(sdw_find_row_index);
  61
  62 static int _sdw_program_slave_port_params(struct sdw_bus *bus,
  63                                           struct sdw_slave *slave,
  64                                           struct sdw_transport_params *t_params,
  65                                           enum sdw_dpn_type type)
  66 {
  67         u32 addr1, addr2, addr3, addr4;
  68         int ret;
  69         u16 wbuf;
  70
  71         if (bus->params.next_bank) {
  72                 addr1 = SDW_DPN_OFFSETCTRL2_B1(t_params->port_num);
  73                 addr2 = SDW_DPN_BLOCKCTRL3_B1(t_params->port_num);
  74                 addr3 = SDW_DPN_SAMPLECTRL2_B1(t_params->port_num);
  75                 addr4 = SDW_DPN_HCTRL_B1(t_params->port_num);
  76         } else {
  77                 addr1 = SDW_DPN_OFFSETCTRL2_B0(t_params->port_num);
  78                 addr2 = SDW_DPN_BLOCKCTRL3_B0(t_params->port_num);
  79                 addr3 = SDW_DPN_SAMPLECTRL2_B0(t_params->port_num);
  80                 addr4 = SDW_DPN_HCTRL_B0(t_params->port_num);
  81         }
  82
  83         /* Program DPN_OffsetCtrl2 registers */
  84         ret = sdw_write(slave, addr1, t_params->offset2);
  85         if (ret < 0) {
  86                 dev_err(bus->dev, "DPN_OffsetCtrl2 register write failed\n");
  87                 return ret;
  88         }
  89
  90         /* Program DPN_BlockCtrl3 register */
  91         ret = sdw_write(slave, addr2, t_params->blk_pkg_mode);
  92         if (ret < 0) {
  93                 dev_err(bus->dev, "DPN_BlockCtrl3 register write failed\n");
  94                 return ret;
  95         }
  96
  97         /*
  98          * Data ports are FULL, SIMPLE and REDUCED. This function handles
  99          * FULL and REDUCED only and beyond this point only FULL is
 100          * handled, so bail out if we are not FULL data port type
 101          */
 102         if (type != SDW_DPN_FULL)
 103                 return ret;
 104
 105         /* Program DPN_SampleCtrl2 register */
 106         wbuf = FIELD_GET(SDW_DPN_SAMPLECTRL_HIGH, t_params->sample_interval - 1);
 107
 108         ret = sdw_write(slave, addr3, wbuf);
 109         if (ret < 0) {
 110                 dev_err(bus->dev, "DPN_SampleCtrl2 register write failed\n");
 111                 return ret;
 112         }
 113
 114         /* Program DPN_HCtrl register */
 115         wbuf = FIELD_PREP(SDW_DPN_HCTRL_HSTART, t_params->hstart);
 116         wbuf |= FIELD_PREP(SDW_DPN_HCTRL_HSTOP, 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         if (s_rt->slave->is_mockup_device)
 138                 return 0;
 139
 140         dpn_prop = sdw_get_slave_dpn_prop(s_rt->slave,
 141                                           s_rt->direction,
 142                                           t_params->port_num);
 143         if (!dpn_prop)
 144                 return -EINVAL;
 145
 146         addr1 = SDW_DPN_PORTCTRL(t_params->port_num);
 147         addr2 = SDW_DPN_BLOCKCTRL1(t_params->port_num);
 148
 149         if (bus->params.next_bank) {
 150                 addr3 = SDW_DPN_SAMPLECTRL1_B1(t_params->port_num);
 151                 addr4 = SDW_DPN_OFFSETCTRL1_B1(t_params->port_num);
 152                 addr5 = SDW_DPN_BLOCKCTRL2_B1(t_params->port_num);
 153                 addr6 = SDW_DPN_LANECTRL_B1(t_params->port_num);
 154
 155         } else {
 156                 addr3 = SDW_DPN_SAMPLECTRL1_B0(t_params->port_num);
 157                 addr4 = SDW_DPN_OFFSETCTRL1_B0(t_params->port_num);
 158                 addr5 = SDW_DPN_BLOCKCTRL2_B0(t_params->port_num);
 159                 addr6 = SDW_DPN_LANECTRL_B0(t_params->port_num);
 160         }
 161
 162         /* Program DPN_PortCtrl register */
 163         wbuf = FIELD_PREP(SDW_DPN_PORTCTRL_DATAMODE, p_params->data_mode);
 164         wbuf |= FIELD_PREP(SDW_DPN_PORTCTRL_FLOWMODE, p_params->flow_mode);
 165
 166         ret = sdw_update(s_rt->slave, addr1, 0xF, wbuf);
 167         if (ret < 0) {
 168                 dev_err(&s_rt->slave->dev,
 169                         "DPN_PortCtrl register write failed for port %d\n",
 170                         t_params->port_num);
 171                 return ret;
 172         }
 173
 174         if (!dpn_prop->read_only_wordlength) {
 175                 /* Program DPN_BlockCtrl1 register */
 176                 ret = sdw_write(s_rt->slave, addr2, (p_params->bps - 1));
 177                 if (ret < 0) {
 178                         dev_err(&s_rt->slave->dev,
 179                                 "DPN_BlockCtrl1 register write failed for port %d\n",
 180                                 t_params->port_num);
 181                         return ret;
 182                 }
 183         }
 184
 185         /* Program DPN_SampleCtrl1 register */
 186         wbuf = (t_params->sample_interval - 1) & SDW_DPN_SAMPLECTRL_LOW;
 187         ret = sdw_write(s_rt->slave, addr3, wbuf);
 188         if (ret < 0) {
 189                 dev_err(&s_rt->slave->dev,
 190                         "DPN_SampleCtrl1 register write failed for port %d\n",
 191                         t_params->port_num);
 192                 return ret;
 193         }
 194
 195         /* Program DPN_OffsetCtrl1 registers */
 196         ret = sdw_write(s_rt->slave, addr4, t_params->offset1);
 197         if (ret < 0) {
 198                 dev_err(&s_rt->slave->dev,
 199                         "DPN_OffsetCtrl1 register write failed for port %d\n",
 200                         t_params->port_num);
 201                 return ret;
 202         }
 203
 204         /* Program DPN_BlockCtrl2 register*/
 205         if (t_params->blk_grp_ctrl_valid) {
 206                 ret = sdw_write(s_rt->slave, addr5, t_params->blk_grp_ctrl);
 207                 if (ret < 0) {
 208                         dev_err(&s_rt->slave->dev,
 209                                 "DPN_BlockCtrl2 reg write failed for port %d\n",
 210                                 t_params->port_num);
 211                         return ret;
 212                 }
 213         }
 214
 215         /* program DPN_LaneCtrl register */
 216         if (slave_prop->lane_control_support) {
 217                 ret = sdw_write(s_rt->slave, addr6, t_params->lane_ctrl);
 218                 if (ret < 0) {
 219                         dev_err(&s_rt->slave->dev,
 220                                 "DPN_LaneCtrl register write failed for port %d\n",
 221                                 t_params->port_num);
 222                         return ret;
 223                 }
 224         }
 225
 226         if (dpn_prop->type != SDW_DPN_SIMPLE) {
 227                 ret = _sdw_program_slave_port_params(bus, s_rt->slave,
 228                                                      t_params, dpn_prop->type);
 229                 if (ret < 0)
 230                         dev_err(&s_rt->slave->dev,
 231                                 "Transport reg write failed for port: %d\n",
 232                                 t_params->port_num);
 233         }
 234
 235         return ret;
 236 }
 237
 238 static int sdw_program_master_port_params(struct sdw_bus *bus,
 239                                           struct sdw_port_runtime *p_rt)
 240 {
 241         int ret;
 242
 243         /*
 244          * we need to set transport and port parameters for the port.
 245          * Transport parameters refers to the sample interval, offsets and
 246          * hstart/stop etc of the data. Port parameters refers to word
 247          * length, flow mode etc of the port
 248          */
 249         ret = bus->port_ops->dpn_set_port_transport_params(bus,
 250                                         &p_rt->transport_params,
 251                                         bus->params.next_bank);
 252         if (ret < 0)
 253                 return ret;
 254
 255         return bus->port_ops->dpn_set_port_params(bus,
 256                                                   &p_rt->port_params,
 257                                                   bus->params.next_bank);
 258 }
 259
 260 /**
 261  * sdw_program_port_params() - Programs transport parameters of Master(s)
 262  * and Slave(s)
 263  *
 264  * @m_rt: Master stream runtime
 265  */
 266 static int sdw_program_port_params(struct sdw_master_runtime *m_rt)
 267 {
 268         struct sdw_slave_runtime *s_rt;
 269         struct sdw_bus *bus = m_rt->bus;
 270         struct sdw_port_runtime *p_rt;
 271         int ret = 0;
 272
 273         /* Program transport & port parameters for Slave(s) */
 274         list_for_each_entry(s_rt, &m_rt->slave_rt_list, m_rt_node) {
 275                 list_for_each_entry(p_rt, &s_rt->port_list, port_node) {
 276                         ret = sdw_program_slave_port_params(bus, s_rt, p_rt);
 277                         if (ret < 0)
 278                                 return ret;
 279                 }
 280         }
 281
 282         /* Program transport & port parameters for Master(s) */
 283         list_for_each_entry(p_rt, &m_rt->port_list, port_node) {
 284                 ret = sdw_program_master_port_params(bus, p_rt);
 285                 if (ret < 0)
 286                         return ret;
 287         }
 288
 289         return 0;
 290 }
 291
 292 /**
 293  * sdw_enable_disable_slave_ports: Enable/disable slave data port
 294  *
 295  * @bus: bus instance
 296  * @s_rt: slave runtime
 297  * @p_rt: port runtime
 298  * @en: enable or disable operation
 299  *
 300  * This function only sets the enable/disable bits in the relevant bank, the
 301  * actual enable/disable is done with a bank switch
 302  */
 303 static int sdw_enable_disable_slave_ports(struct sdw_bus *bus,
 304                                           struct sdw_slave_runtime *s_rt,
 305                                           struct sdw_port_runtime *p_rt,
 306                                           bool en)
 307 {
 308         struct sdw_transport_params *t_params = &p_rt->transport_params;
 309         u32 addr;
 310         int ret;
 311
 312         if (bus->params.next_bank)
 313                 addr = SDW_DPN_CHANNELEN_B1(p_rt->num);
 314         else
 315                 addr = SDW_DPN_CHANNELEN_B0(p_rt->num);
 316
 317         /*
 318          * Since bus doesn't support sharing a port across two streams,
 319          * it is safe to reset this register
 320          */
 321         if (en)
 322                 ret = sdw_write(s_rt->slave, addr, p_rt->ch_mask);
 323         else
 324                 ret = sdw_write(s_rt->slave, addr, 0x0);
 325
 326         if (ret < 0)
 327                 dev_err(&s_rt->slave->dev,
 328                         "Slave chn_en reg write failed:%d port:%d\n",
 329                         ret, t_params->port_num);
 330
 331         return ret;
 332 }
 333
 334 static int sdw_enable_disable_master_ports(struct sdw_master_runtime *m_rt,
 335                                            struct sdw_port_runtime *p_rt,
 336                                            bool en)
 337 {
 338         struct sdw_transport_params *t_params = &p_rt->transport_params;
 339         struct sdw_bus *bus = m_rt->bus;
 340         struct sdw_enable_ch enable_ch;
 341         int ret;
 342
 343         enable_ch.port_num = p_rt->num;
 344         enable_ch.ch_mask = p_rt->ch_mask;
 345         enable_ch.enable = en;
 346
 347         /* Perform Master port channel(s) enable/disable */
 348         if (bus->port_ops->dpn_port_enable_ch) {
 349                 ret = bus->port_ops->dpn_port_enable_ch(bus,
 350                                                         &enable_ch,
 351                                                         bus->params.next_bank);
 352                 if (ret < 0) {
 353                         dev_err(bus->dev,
 354                                 "Master chn_en write failed:%d port:%d\n",
 355                                 ret, t_params->port_num);
 356                         return ret;
 357                 }
 358         } else {
 359                 dev_err(bus->dev,
 360                         "dpn_port_enable_ch not supported, %s failed\n",
 361                         en ? "enable" : "disable");
 362                 return -EINVAL;
 363         }
 364
 365         return 0;
 366 }
 367
 368 /**
 369  * sdw_enable_disable_ports() - Enable/disable port(s) for Master and
 370  * Slave(s)
 371  *
 372  * @m_rt: Master stream runtime
 373  * @en: mode (enable/disable)
 374  */
 375 static int sdw_enable_disable_ports(struct sdw_master_runtime *m_rt, bool en)
 376 {
 377         struct sdw_port_runtime *s_port, *m_port;
 378         struct sdw_slave_runtime *s_rt;
 379         int ret = 0;
 380
 381         /* Enable/Disable Slave port(s) */
 382         list_for_each_entry(s_rt, &m_rt->slave_rt_list, m_rt_node) {
 383                 list_for_each_entry(s_port, &s_rt->port_list, port_node) {
 384                         ret = sdw_enable_disable_slave_ports(m_rt->bus, s_rt,
 385                                                              s_port, en);
 386                         if (ret < 0)
 387                                 return ret;
 388                 }
 389         }
 390
 391         /* Enable/Disable Master port(s) */
 392         list_for_each_entry(m_port, &m_rt->port_list, port_node) {
 393                 ret = sdw_enable_disable_master_ports(m_rt, m_port, en);
 394                 if (ret < 0)
 395                         return ret;
 396         }
 397
 398         return 0;
 399 }
 400
 401 static int sdw_do_port_prep(struct sdw_slave_runtime *s_rt,
 402                             struct sdw_prepare_ch prep_ch,
 403                             enum sdw_port_prep_ops cmd)
 404 {
 405         int ret = 0;
 406         struct sdw_slave *slave = s_rt->slave;
 407
 408         mutex_lock(&slave->sdw_dev_lock);
 409
 410         if (slave->probed) {
 411                 struct device *dev = &slave->dev;
 412                 struct sdw_driver *drv = drv_to_sdw_driver(dev->driver);
 413
 414                 if (drv->ops && drv->ops->port_prep) {
 415                         ret = drv->ops->port_prep(slave, &prep_ch, cmd);
 416                         if (ret < 0)
 417                                 dev_err(dev, "Slave Port Prep cmd %d failed: %d\n",
 418                                         cmd, ret);
 419                 }
 420         }
 421
 422         mutex_unlock(&slave->sdw_dev_lock);
 423
 424         return ret;
 425 }
 426
 427 static int sdw_prep_deprep_slave_ports(struct sdw_bus *bus,
 428                                        struct sdw_slave_runtime *s_rt,
 429                                        struct sdw_port_runtime *p_rt,
 430                                        bool prep)
 431 {
 432         struct completion *port_ready;
 433         struct sdw_dpn_prop *dpn_prop;
 434         struct sdw_prepare_ch prep_ch;
 435         bool intr = false;
 436         int ret = 0, val;
 437         u32 addr;
 438
 439         prep_ch.num = p_rt->num;
 440         prep_ch.ch_mask = p_rt->ch_mask;
 441
 442         dpn_prop = sdw_get_slave_dpn_prop(s_rt->slave,
 443                                           s_rt->direction,
 444                                           prep_ch.num);
 445         if (!dpn_prop) {
 446                 dev_err(bus->dev,
 447                         "Slave Port:%d properties not found\n", prep_ch.num);
 448                 return -EINVAL;
 449         }
 450
 451         prep_ch.prepare = prep;
 452
 453         prep_ch.bank = bus->params.next_bank;
 454
 455         if (dpn_prop->imp_def_interrupts || !dpn_prop->simple_ch_prep_sm ||
 456             bus->params.s_data_mode != SDW_PORT_DATA_MODE_NORMAL)
 457                 intr = true;
 458
 459         /*
 460          * Enable interrupt before Port prepare.
 461          * For Port de-prepare, it is assumed that port
 462          * was prepared earlier
 463          */
 464         if (prep && intr) {
 465                 ret = sdw_configure_dpn_intr(s_rt->slave, p_rt->num, prep,
 466                                              dpn_prop->imp_def_interrupts);
 467                 if (ret < 0)
 468                         return ret;
 469         }
 470
 471         /* Inform slave about the impending port prepare */
 472         sdw_do_port_prep(s_rt, prep_ch, SDW_OPS_PORT_PRE_PREP);
 473
 474         /* Prepare Slave port implementing CP_SM */
 475         if (!dpn_prop->simple_ch_prep_sm) {
 476                 addr = SDW_DPN_PREPARECTRL(p_rt->num);
 477
 478                 if (prep)
 479                         ret = sdw_write(s_rt->slave, addr, p_rt->ch_mask);
 480                 else
 481                         ret = sdw_write(s_rt->slave, addr, 0x0);
 482
 483                 if (ret < 0) {
 484                         dev_err(&s_rt->slave->dev,
 485                                 "Slave prep_ctrl reg write failed\n");
 486                         return ret;
 487                 }
 488
 489                 /* Wait for completion on port ready */
 490                 port_ready = &s_rt->slave->port_ready[prep_ch.num];
 491                 wait_for_completion_timeout(port_ready,
 492                         msecs_to_jiffies(dpn_prop->ch_prep_timeout));
 493
 494                 val = sdw_read(s_rt->slave, SDW_DPN_PREPARESTATUS(p_rt->num));
 495                 if ((val < 0) || (val & p_rt->ch_mask)) {
 496                         ret = (val < 0) ? val : -ETIMEDOUT;
 497                         dev_err(&s_rt->slave->dev,
 498                                 "Chn prep failed for port %d: %d\n", prep_ch.num, ret);
 499                         return ret;
 500                 }
 501         }
 502
 503         /* Inform slaves about ports prepared */
 504         sdw_do_port_prep(s_rt, prep_ch, SDW_OPS_PORT_POST_PREP);
 505
 506         /* Disable interrupt after Port de-prepare */
 507         if (!prep && intr)
 508                 ret = sdw_configure_dpn_intr(s_rt->slave, p_rt->num, prep,
 509                                              dpn_prop->imp_def_interrupts);
 510
 511         return ret;
 512 }
 513
 514 static int sdw_prep_deprep_master_ports(struct sdw_master_runtime *m_rt,
 515                                         struct sdw_port_runtime *p_rt,
 516                                         bool prep)
 517 {
 518         struct sdw_transport_params *t_params = &p_rt->transport_params;
 519         struct sdw_bus *bus = m_rt->bus;
 520         const struct sdw_master_port_ops *ops = bus->port_ops;
 521         struct sdw_prepare_ch prep_ch;
 522         int ret = 0;
 523
 524         prep_ch.num = p_rt->num;
 525         prep_ch.ch_mask = p_rt->ch_mask;
 526         prep_ch.prepare = prep; /* Prepare/De-prepare */
 527         prep_ch.bank = bus->params.next_bank;
 528
 529         /* Pre-prepare/Pre-deprepare port(s) */
 530         if (ops->dpn_port_prep) {
 531                 ret = ops->dpn_port_prep(bus, &prep_ch);
 532                 if (ret < 0) {
 533                         dev_err(bus->dev, "Port prepare failed for port:%d\n",
 534                                 t_params->port_num);
 535                         return ret;
 536                 }
 537         }
 538
 539         return ret;
 540 }
 541
 542 /**
 543  * sdw_prep_deprep_ports() - Prepare/De-prepare port(s) for Master(s) and
 544  * Slave(s)
 545  *
 546  * @m_rt: Master runtime handle
 547  * @prep: Prepare or De-prepare
 548  */
 549 static int sdw_prep_deprep_ports(struct sdw_master_runtime *m_rt, bool prep)
 550 {
 551         struct sdw_slave_runtime *s_rt;
 552         struct sdw_port_runtime *p_rt;
 553         int ret = 0;
 554
 555         /* Prepare/De-prepare Slave port(s) */
 556         list_for_each_entry(s_rt, &m_rt->slave_rt_list, m_rt_node) {
 557                 list_for_each_entry(p_rt, &s_rt->port_list, port_node) {
 558                         ret = sdw_prep_deprep_slave_ports(m_rt->bus, s_rt,
 559                                                           p_rt, prep);
 560                         if (ret < 0)
 561                                 return ret;
 562                 }
 563         }
 564
 565         /* Prepare/De-prepare Master port(s) */
 566         list_for_each_entry(p_rt, &m_rt->port_list, port_node) {
 567                 ret = sdw_prep_deprep_master_ports(m_rt, p_rt, prep);
 568                 if (ret < 0)
 569                         return ret;
 570         }
 571
 572         return ret;
 573 }
 574
 575 /**
 576  * sdw_notify_config() - Notify bus configuration
 577  *
 578  * @m_rt: Master runtime handle
 579  *
 580  * This function notifies the Master(s) and Slave(s) of the
 581  * new bus configuration.
 582  */
 583 static int sdw_notify_config(struct sdw_master_runtime *m_rt)
 584 {
 585         struct sdw_slave_runtime *s_rt;
 586         struct sdw_bus *bus = m_rt->bus;
 587         struct sdw_slave *slave;
 588         int ret;
 589
 590         if (bus->ops->set_bus_conf) {
 591                 ret = bus->ops->set_bus_conf(bus, &bus->params);
 592                 if (ret < 0)
 593                         return ret;
 594         }
 595
 596         list_for_each_entry(s_rt, &m_rt->slave_rt_list, m_rt_node) {
 597                 slave = s_rt->slave;
 598
 599                 mutex_lock(&slave->sdw_dev_lock);
 600
 601                 if (slave->probed) {
 602                         struct device *dev = &slave->dev;
 603                         struct sdw_driver *drv = drv_to_sdw_driver(dev->driver);
 604
 605                         if (drv->ops && drv->ops->bus_config) {
 606                                 ret = drv->ops->bus_config(slave, &bus->params);
 607                                 if (ret < 0) {
 608                                         dev_err(dev, "Notify Slave: %d failed\n",
 609                                                 slave->dev_num);
 610                                         mutex_unlock(&slave->sdw_dev_lock);
 611                                         return ret;
 612                                 }
 613                         }
 614                 }
 615
 616                 mutex_unlock(&slave->sdw_dev_lock);
 617         }
 618
 619         return 0;
 620 }
 621
 622 /**
 623  * sdw_program_params() - Program transport and port parameters for Master(s)
 624  * and Slave(s)
 625  *
 626  * @bus: SDW bus instance
 627  * @prepare: true if sdw_program_params() is called by _prepare.
 628  */
 629 static int sdw_program_params(struct sdw_bus *bus, bool prepare)
 630 {
 631         struct sdw_master_runtime *m_rt;
 632         int ret = 0;
 633
 634         list_for_each_entry(m_rt, &bus->m_rt_list, bus_node) {
 635
 636                 /*
 637                  * this loop walks through all master runtimes for a
 638                  * bus, but the ports can only be configured while
 639                  * explicitly preparing a stream or handling an
 640                  * already-prepared stream otherwise.
 641                  */
 642                 if (!prepare &&
 643                     m_rt->stream->state == SDW_STREAM_CONFIGURED)
 644                         continue;
 645
 646                 ret = sdw_program_port_params(m_rt);
 647                 if (ret < 0) {
 648                         dev_err(bus->dev,
 649                                 "Program transport params failed: %d\n", ret);
 650                         return ret;
 651                 }
 652
 653                 ret = sdw_notify_config(m_rt);
 654                 if (ret < 0) {
 655                         dev_err(bus->dev,
 656                                 "Notify bus config failed: %d\n", ret);
 657                         return ret;
 658                 }
 659
 660                 /* Enable port(s) on alternate bank for all active streams */
 661                 if (m_rt->stream->state != SDW_STREAM_ENABLED)
 662                         continue;
 663
 664                 ret = sdw_enable_disable_ports(m_rt, true);
 665                 if (ret < 0) {
 666                         dev_err(bus->dev, "Enable channel failed: %d\n", ret);
 667                         return ret;
 668                 }
 669         }
 670
 671         return ret;
 672 }
 673
 674 static int sdw_bank_switch(struct sdw_bus *bus, int m_rt_count)
 675 {
 676         int col_index, row_index;
 677         bool multi_link;
 678         struct sdw_msg *wr_msg;
 679         u8 *wbuf;
 680         int ret;
 681         u16 addr;
 682
 683         wr_msg = kzalloc(sizeof(*wr_msg), GFP_KERNEL);
 684         if (!wr_msg)
 685                 return -ENOMEM;
 686
 687         bus->defer_msg.msg = wr_msg;
 688
 689         wbuf = kzalloc(sizeof(*wbuf), GFP_KERNEL);
 690         if (!wbuf) {
 691                 ret = -ENOMEM;
 692                 goto error_1;
 693         }
 694
 695         /* Get row and column index to program register */
 696         col_index = sdw_find_col_index(bus->params.col);
 697         row_index = sdw_find_row_index(bus->params.row);
 698         wbuf[0] = col_index | (row_index << 3);
 699
 700         if (bus->params.next_bank)
 701                 addr = SDW_SCP_FRAMECTRL_B1;
 702         else
 703                 addr = SDW_SCP_FRAMECTRL_B0;
 704
 705         sdw_fill_msg(wr_msg, NULL, addr, 1, SDW_BROADCAST_DEV_NUM,
 706                      SDW_MSG_FLAG_WRITE, wbuf);
 707         wr_msg->ssp_sync = true;
 708
 709         /*
 710          * Set the multi_link flag only when both the hardware supports
 711          * and hardware-based sync is required
 712          */
 713         multi_link = bus->multi_link && (m_rt_count >= bus->hw_sync_min_links);
 714
 715         if (multi_link)
 716                 ret = sdw_transfer_defer(bus, wr_msg, &bus->defer_msg);
 717         else
 718                 ret = sdw_transfer(bus, wr_msg);
 719
 720         if (ret < 0 && ret != -ENODATA) {
 721                 dev_err(bus->dev, "Slave frame_ctrl reg write failed\n");
 722                 goto error;
 723         }
 724
 725         if (!multi_link) {
 726                 kfree(wr_msg);
 727                 kfree(wbuf);
 728                 bus->defer_msg.msg = NULL;
 729                 bus->params.curr_bank = !bus->params.curr_bank;
 730                 bus->params.next_bank = !bus->params.next_bank;
 731         }
 732
 733         return 0;
 734
 735 error:
 736         kfree(wbuf);
 737 error_1:
 738         kfree(wr_msg);
 739         bus->defer_msg.msg = NULL;
 740         return ret;
 741 }
 742
 743 /**
 744  * sdw_ml_sync_bank_switch: Multilink register bank switch
 745  *
 746  * @bus: SDW bus instance
 747  *
 748  * Caller function should free the buffers on error
 749  */
 750 static int sdw_ml_sync_bank_switch(struct sdw_bus *bus)
 751 {
 752         unsigned long time_left;
 753
 754         if (!bus->multi_link)
 755                 return 0;
 756
 757         /* Wait for completion of transfer */
 758         time_left = wait_for_completion_timeout(&bus->defer_msg.complete,
 759                                                 bus->bank_switch_timeout);
 760
 761         if (!time_left) {
 762                 dev_err(bus->dev, "Controller Timed out on bank switch\n");
 763                 return -ETIMEDOUT;
 764         }
 765
 766         bus->params.curr_bank = !bus->params.curr_bank;
 767         bus->params.next_bank = !bus->params.next_bank;
 768
 769         if (bus->defer_msg.msg) {
 770                 kfree(bus->defer_msg.msg->buf);
 771                 kfree(bus->defer_msg.msg);
 772         }
 773
 774         return 0;
 775 }
 776
 777 static int do_bank_switch(struct sdw_stream_runtime *stream)
 778 {
 779         struct sdw_master_runtime *m_rt;
 780         const struct sdw_master_ops *ops;
 781         struct sdw_bus *bus;
 782         bool multi_link = false;
 783         int m_rt_count;
 784         int ret = 0;
 785
 786         m_rt_count = stream->m_rt_count;
 787
 788         list_for_each_entry(m_rt, &stream->master_list, stream_node) {
 789                 bus = m_rt->bus;
 790                 ops = bus->ops;
 791
 792                 if (bus->multi_link && m_rt_count >= bus->hw_sync_min_links) {
 793                         multi_link = true;
 794                         mutex_lock(&bus->msg_lock);
 795                 }
 796
 797                 /* Pre-bank switch */
 798                 if (ops->pre_bank_switch) {
 799                         ret = ops->pre_bank_switch(bus);
 800                         if (ret < 0) {
 801                                 dev_err(bus->dev,
 802                                         "Pre bank switch op failed: %d\n", ret);
 803                                 goto msg_unlock;
 804                         }
 805                 }
 806
 807                 /*
 808                  * Perform Bank switch operation.
 809                  * For multi link cases, the actual bank switch is
 810                  * synchronized across all Masters and happens later as a
 811                  * part of post_bank_switch ops.
 812                  */
 813                 ret = sdw_bank_switch(bus, m_rt_count);
 814                 if (ret < 0) {
 815                         dev_err(bus->dev, "Bank switch failed: %d\n", ret);
 816                         goto error;
 817                 }
 818         }
 819
 820         /*
 821          * For multi link cases, it is expected that the bank switch is
 822          * triggered by the post_bank_switch for the first Master in the list
 823          * and for the other Masters the post_bank_switch() should return doing
 824          * nothing.
 825          */
 826         list_for_each_entry(m_rt, &stream->master_list, stream_node) {
 827                 bus = m_rt->bus;
 828                 ops = bus->ops;
 829
 830                 /* Post-bank switch */
 831                 if (ops->post_bank_switch) {
 832                         ret = ops->post_bank_switch(bus);
 833                         if (ret < 0) {
 834                                 dev_err(bus->dev,
 835                                         "Post bank switch op failed: %d\n",
 836                                         ret);
 837                                 goto error;
 838                         }
 839                 } else if (multi_link) {
 840                         dev_err(bus->dev,
 841                                 "Post bank switch ops not implemented\n");
 842                         goto error;
 843                 }
 844
 845                 /* Set the bank switch timeout to default, if not set */
 846                 if (!bus->bank_switch_timeout)
 847                         bus->bank_switch_timeout = DEFAULT_BANK_SWITCH_TIMEOUT;
 848
 849                 /* Check if bank switch was successful */
 850                 ret = sdw_ml_sync_bank_switch(bus);
 851                 if (ret < 0) {
 852                         dev_err(bus->dev,
 853                                 "multi link bank switch failed: %d\n", ret);
 854                         goto error;
 855                 }
 856
 857                 if (multi_link)
 858                         mutex_unlock(&bus->msg_lock);
 859         }
 860
 861         return ret;
 862
 863 error:
 864         list_for_each_entry(m_rt, &stream->master_list, stream_node) {
 865                 bus = m_rt->bus;
 866                 if (bus->defer_msg.msg) {
 867                         kfree(bus->defer_msg.msg->buf);
 868                         kfree(bus->defer_msg.msg);
 869                 }
 870         }
 871
 872 msg_unlock:
 873
 874         if (multi_link) {
 875                 list_for_each_entry(m_rt, &stream->master_list, stream_node) {
 876                         bus = m_rt->bus;
 877                         if (mutex_is_locked(&bus->msg_lock))
 878                                 mutex_unlock(&bus->msg_lock);
 879                 }
 880         }
 881
 882         return ret;
 883 }
 884
 885 /**
 886  * sdw_release_stream() - Free the assigned stream runtime
 887  *
 888  * @stream: SoundWire stream runtime
 889  *
 890  * sdw_release_stream should be called only once per stream
 891  */
 892 void sdw_release_stream(struct sdw_stream_runtime *stream)
 893 {
 894         kfree(stream);
 895 }
 896 EXPORT_SYMBOL(sdw_release_stream);
 897
 898 /**
 899  * sdw_alloc_stream() - Allocate and return stream runtime
 900  *
 901  * @stream_name: SoundWire stream name
 902  *
 903  * Allocates a SoundWire stream runtime instance.
 904  * sdw_alloc_stream should be called only once per stream. Typically
 905  * invoked from ALSA/ASoC machine/platform driver.
 906  */
 907 struct sdw_stream_runtime *sdw_alloc_stream(const char *stream_name)
 908 {
 909         struct sdw_stream_runtime *stream;
 910
 911         stream = kzalloc(sizeof(*stream), GFP_KERNEL);
 912         if (!stream)
 913                 return NULL;
 914
 915         stream->name = stream_name;
 916         INIT_LIST_HEAD(&stream->master_list);
 917         stream->state = SDW_STREAM_ALLOCATED;
 918         stream->m_rt_count = 0;
 919
 920         return stream;
 921 }
 922 EXPORT_SYMBOL(sdw_alloc_stream);
 923
 924 static struct sdw_master_runtime
 925 *sdw_find_master_rt(struct sdw_bus *bus,
 926                     struct sdw_stream_runtime *stream)
 927 {
 928         struct sdw_master_runtime *m_rt;
 929
 930         /* Retrieve Bus handle if already available */
 931         list_for_each_entry(m_rt, &stream->master_list, stream_node) {
 932                 if (m_rt->bus == bus)
 933                         return m_rt;
 934         }
 935
 936         return NULL;
 937 }
 938
 939 /**
 940  * sdw_alloc_master_rt() - Allocates and initialize Master runtime handle
 941  *
 942  * @bus: SDW bus instance
 943  * @stream_config: Stream configuration
 944  * @stream: Stream runtime handle.
 945  *
 946  * This function is to be called with bus_lock held.
 947  */
 948 static struct sdw_master_runtime
 949 *sdw_alloc_master_rt(struct sdw_bus *bus,
 950                      struct sdw_stream_config *stream_config,
 951                      struct sdw_stream_runtime *stream)
 952 {
 953         struct sdw_master_runtime *m_rt;
 954
 955         /*
 956          * check if Master is already allocated (as a result of Slave adding
 957          * it first), if so skip allocation and go to configure
 958          */
 959         m_rt = sdw_find_master_rt(bus, stream);
 960         if (m_rt)
 961                 goto stream_config;
 962
 963         m_rt = kzalloc(sizeof(*m_rt), GFP_KERNEL);
 964         if (!m_rt)
 965                 return NULL;
 966
 967         /* Initialization of Master runtime handle */
 968         INIT_LIST_HEAD(&m_rt->port_list);
 969         INIT_LIST_HEAD(&m_rt->slave_rt_list);
 970         list_add_tail(&m_rt->stream_node, &stream->master_list);
 971
 972         list_add_tail(&m_rt->bus_node, &bus->m_rt_list);
 973
 974 stream_config:
 975         m_rt->ch_count = stream_config->ch_count;
 976         m_rt->bus = bus;
 977         m_rt->stream = stream;
 978         m_rt->direction = stream_config->direction;
 979
 980         return m_rt;
 981 }
 982
 983 /**
 984  * sdw_alloc_slave_rt() - Allocate and initialize Slave runtime handle.
 985  *
 986  * @slave: Slave handle
 987  * @stream_config: Stream configuration
 988  * @stream: Stream runtime handle
 989  *
 990  * This function is to be called with bus_lock held.
 991  */
 992 static struct sdw_slave_runtime
 993 *sdw_alloc_slave_rt(struct sdw_slave *slave,
 994                     struct sdw_stream_config *stream_config,
 995                     struct sdw_stream_runtime *stream)
 996 {
 997         struct sdw_slave_runtime *s_rt;
 998
 999         s_rt = kzalloc(sizeof(*s_rt), GFP_KERNEL);
1000         if (!s_rt)
1001                 return NULL;
1002
1003         INIT_LIST_HEAD(&s_rt->port_list);
1004         s_rt->ch_count = stream_config->ch_count;
1005         s_rt->direction = stream_config->direction;
1006         s_rt->slave = slave;
1007
1008         return s_rt;
1009 }
1010
1011 static void sdw_master_port_release(struct sdw_bus *bus,
1012                                     struct sdw_master_runtime *m_rt)
1013 {
1014         struct sdw_port_runtime *p_rt, *_p_rt;
1015
1016         list_for_each_entry_safe(p_rt, _p_rt, &m_rt->port_list, port_node) {
1017                 list_del(&p_rt->port_node);
1018                 kfree(p_rt);
1019         }
1020 }
1021
1022 static void sdw_slave_port_release(struct sdw_bus *bus,
1023                                    struct sdw_slave *slave,
1024                                    struct sdw_stream_runtime *stream)
1025 {
1026         struct sdw_port_runtime *p_rt, *_p_rt;
1027         struct sdw_master_runtime *m_rt;
1028         struct sdw_slave_runtime *s_rt;
1029
1030         list_for_each_entry(m_rt, &stream->master_list, stream_node) {
1031                 list_for_each_entry(s_rt, &m_rt->slave_rt_list, m_rt_node) {
1032                         if (s_rt->slave != slave)
1033                                 continue;
1034
1035                         list_for_each_entry_safe(p_rt, _p_rt,
1036                                                  &s_rt->port_list, port_node) {
1037                                 list_del(&p_rt->port_node);
1038                                 kfree(p_rt);
1039                         }
1040                 }
1041         }
1042 }
1043
1044 /**
1045  * sdw_release_slave_stream() - Free Slave(s) runtime handle
1046  *
1047  * @slave: Slave handle.
1048  * @stream: Stream runtime handle.
1049  *
1050  * This function is to be called with bus_lock held.
1051  */
1052 static void sdw_release_slave_stream(struct sdw_slave *slave,
1053                                      struct sdw_stream_runtime *stream)
1054 {
1055         struct sdw_slave_runtime *s_rt, *_s_rt;
1056         struct sdw_master_runtime *m_rt;
1057
1058         list_for_each_entry(m_rt, &stream->master_list, stream_node) {
1059                 /* Retrieve Slave runtime handle */
1060                 list_for_each_entry_safe(s_rt, _s_rt,
1061                                          &m_rt->slave_rt_list, m_rt_node) {
1062                         if (s_rt->slave == slave) {
1063                                 list_del(&s_rt->m_rt_node);
1064                                 kfree(s_rt);
1065                                 return;
1066                         }
1067                 }
1068         }
1069 }
1070
1071 /**
1072  * sdw_release_master_stream() - Free Master runtime handle
1073  *
1074  * @m_rt: Master runtime node
1075  * @stream: Stream runtime handle.
1076  *
1077  * This function is to be called with bus_lock held
1078  * It frees the Master runtime handle and associated Slave(s) runtime
1079  * handle. If this is called first then sdw_release_slave_stream() will have
1080  * no effect as Slave(s) runtime handle would already be freed up.
1081  */
1082 static void sdw_release_master_stream(struct sdw_master_runtime *m_rt,
1083                                       struct sdw_stream_runtime *stream)
1084 {
1085         struct sdw_slave_runtime *s_rt, *_s_rt;
1086
1087         list_for_each_entry_safe(s_rt, _s_rt, &m_rt->slave_rt_list, m_rt_node) {
1088                 sdw_slave_port_release(s_rt->slave->bus, s_rt->slave, stream);
1089                 sdw_release_slave_stream(s_rt->slave, stream);
1090         }
1091
1092         list_del(&m_rt->stream_node);
1093         list_del(&m_rt->bus_node);
1094         kfree(m_rt);
1095 }
1096
1097 /**
1098  * sdw_stream_remove_master() - Remove master from sdw_stream
1099  *
1100  * @bus: SDW Bus instance
1101  * @stream: SoundWire stream
1102  *
1103  * This removes and frees port_rt and master_rt from a stream
1104  */
1105 int sdw_stream_remove_master(struct sdw_bus *bus,
1106                              struct sdw_stream_runtime *stream)
1107 {
1108         struct sdw_master_runtime *m_rt, *_m_rt;
1109
1110         mutex_lock(&bus->bus_lock);
1111
1112         list_for_each_entry_safe(m_rt, _m_rt,
1113                                  &stream->master_list, stream_node) {
1114                 if (m_rt->bus != bus)
1115                         continue;
1116
1117                 sdw_master_port_release(bus, m_rt);
1118                 sdw_release_master_stream(m_rt, stream);
1119                 stream->m_rt_count--;
1120         }
1121
1122         if (list_empty(&stream->master_list))
1123                 stream->state = SDW_STREAM_RELEASED;
1124
1125         mutex_unlock(&bus->bus_lock);
1126
1127         return 0;
1128 }
1129 EXPORT_SYMBOL(sdw_stream_remove_master);
1130
1131 /**
1132  * sdw_stream_remove_slave() - Remove slave from sdw_stream
1133  *
1134  * @slave: SDW Slave instance
1135  * @stream: SoundWire stream
1136  *
1137  * This removes and frees port_rt and slave_rt from a stream
1138  */
1139 int sdw_stream_remove_slave(struct sdw_slave *slave,
1140                             struct sdw_stream_runtime *stream)
1141 {
1142         mutex_lock(&slave->bus->bus_lock);
1143
1144         sdw_slave_port_release(slave->bus, slave, stream);
1145         sdw_release_slave_stream(slave, stream);
1146
1147         mutex_unlock(&slave->bus->bus_lock);
1148
1149         return 0;
1150 }
1151 EXPORT_SYMBOL(sdw_stream_remove_slave);
1152
1153 /**
1154  * sdw_config_stream() - Configure the allocated stream
1155  *
1156  * @dev: SDW device
1157  * @stream: SoundWire stream
1158  * @stream_config: Stream configuration for audio stream
1159  * @is_slave: is API called from Slave or Master
1160  *
1161  * This function is to be called with bus_lock held.
1162  */
1163 static int sdw_config_stream(struct device *dev,
1164                              struct sdw_stream_runtime *stream,
1165                              struct sdw_stream_config *stream_config,
1166                              bool is_slave)
1167 {
1168         /*
1169          * Update the stream rate, channel and bps based on data
1170          * source. For more than one data source (multilink),
1171          * match the rate, bps, stream type and increment number of channels.
1172          *
1173          * If rate/bps is zero, it means the values are not set, so skip
1174          * comparison and allow the value to be set and stored in stream
1175          */
1176         if (stream->params.rate &&
1177             stream->params.rate != stream_config->frame_rate) {
1178                 dev_err(dev, "rate not matching, stream:%s\n", stream->name);
1179                 return -EINVAL;
1180         }
1181
1182         if (stream->params.bps &&
1183             stream->params.bps != stream_config->bps) {
1184                 dev_err(dev, "bps not matching, stream:%s\n", stream->name);
1185                 return -EINVAL;
1186         }
1187
1188         stream->type = stream_config->type;
1189         stream->params.rate = stream_config->frame_rate;
1190         stream->params.bps = stream_config->bps;
1191
1192         /* TODO: Update this check during Device-device support */
1193         if (is_slave)
1194                 stream->params.ch_count += stream_config->ch_count;
1195
1196         return 0;
1197 }
1198
1199 static int sdw_is_valid_port_range(struct device *dev,
1200                                    struct sdw_port_runtime *p_rt)
1201 {
1202         if (!SDW_VALID_PORT_RANGE(p_rt->num)) {
1203                 dev_err(dev,
1204                         "SoundWire: Invalid port number :%d\n", p_rt->num);
1205                 return -EINVAL;
1206         }
1207
1208         return 0;
1209 }
1210
1211 static struct sdw_port_runtime
1212 *sdw_port_alloc(struct device *dev,
1213                 struct sdw_port_config *port_config,
1214                 int port_index)
1215 {
1216         struct sdw_port_runtime *p_rt;
1217
1218         p_rt = kzalloc(sizeof(*p_rt), GFP_KERNEL);
1219         if (!p_rt)
1220                 return NULL;
1221
1222         p_rt->ch_mask = port_config[port_index].ch_mask;
1223         p_rt->num = port_config[port_index].num;
1224
1225         return p_rt;
1226 }
1227
1228 static int sdw_master_port_config(struct sdw_bus *bus,
1229                                   struct sdw_master_runtime *m_rt,
1230                                   struct sdw_port_config *port_config,
1231                                   unsigned int num_ports)
1232 {
1233         struct sdw_port_runtime *p_rt;
1234         int i;
1235
1236         /* Iterate for number of ports to perform initialization */
1237         for (i = 0; i < num_ports; i++) {
1238                 p_rt = sdw_port_alloc(bus->dev, port_config, i);
1239                 if (!p_rt)
1240                         return -ENOMEM;
1241
1242                 /*
1243                  * TODO: Check port capabilities for requested
1244                  * configuration (audio mode support)
1245                  */
1246
1247                 list_add_tail(&p_rt->port_node, &m_rt->port_list);
1248         }
1249
1250         return 0;
1251 }
1252
1253 static int sdw_slave_port_config(struct sdw_slave *slave,
1254                                  struct sdw_slave_runtime *s_rt,
1255                                  struct sdw_port_config *port_config,
1256                                  unsigned int num_config)
1257 {
1258         struct sdw_port_runtime *p_rt;
1259         int i, ret;
1260
1261         /* Iterate for number of ports to perform initialization */
1262         for (i = 0; i < num_config; i++) {
1263                 p_rt = sdw_port_alloc(&slave->dev, port_config, i);
1264                 if (!p_rt)
1265                         return -ENOMEM;
1266
1267                 /*
1268                  * TODO: Check valid port range as defined by DisCo/
1269                  * slave
1270                  */
1271                 ret = sdw_is_valid_port_range(&slave->dev, p_rt);
1272                 if (ret < 0) {
1273                         kfree(p_rt);
1274                         return ret;
1275                 }
1276
1277                 /*
1278                  * TODO: Check port capabilities for requested
1279                  * configuration (audio mode support)
1280                  */
1281
1282                 list_add_tail(&p_rt->port_node, &s_rt->port_list);
1283         }
1284
1285         return 0;
1286 }
1287
1288 /**
1289  * sdw_stream_add_master() - Allocate and add master runtime to a stream
1290  *
1291  * @bus: SDW Bus instance
1292  * @stream_config: Stream configuration for audio stream
1293  * @port_config: Port configuration for audio stream
1294  * @num_ports: Number of ports
1295  * @stream: SoundWire stream
1296  */
1297 int sdw_stream_add_master(struct sdw_bus *bus,
1298                           struct sdw_stream_config *stream_config,
1299                           struct sdw_port_config *port_config,
1300                           unsigned int num_ports,
1301                           struct sdw_stream_runtime *stream)
1302 {
1303         struct sdw_master_runtime *m_rt;
1304         int ret;
1305
1306         mutex_lock(&bus->bus_lock);
1307
1308         /*
1309          * For multi link streams, add the second master only if
1310          * the bus supports it.
1311          * Check if bus->multi_link is set
1312          */
1313         if (!bus->multi_link && stream->m_rt_count > 0) {
1314                 dev_err(bus->dev,
1315                         "Multilink not supported, link %d\n", bus->link_id);
1316                 ret = -EINVAL;
1317                 goto unlock;
1318         }
1319
1320         m_rt = sdw_alloc_master_rt(bus, stream_config, stream);
1321         if (!m_rt) {
1322                 dev_err(bus->dev,
1323                         "Master runtime config failed for stream:%s\n",
1324                         stream->name);
1325                 ret = -ENOMEM;
1326                 goto unlock;
1327         }
1328
1329         ret = sdw_config_stream(bus->dev, stream, stream_config, false);
1330         if (ret)
1331                 goto stream_error;
1332
1333         ret = sdw_master_port_config(bus, m_rt, port_config, num_ports);
1334         if (ret)
1335                 goto stream_error;
1336
1337         stream->m_rt_count++;
1338
1339         goto unlock;
1340
1341 stream_error:
1342         sdw_release_master_stream(m_rt, stream);
1343 unlock:
1344         mutex_unlock(&bus->bus_lock);
1345         return ret;
1346 }
1347 EXPORT_SYMBOL(sdw_stream_add_master);
1348
1349 /**
1350  * sdw_stream_add_slave() - Allocate and add master/slave runtime to a stream
1351  *
1352  * @slave: SDW Slave instance
1353  * @stream_config: Stream configuration for audio stream
1354  * @stream: SoundWire stream
1355  * @port_config: Port configuration for audio stream
1356  * @num_ports: Number of ports
1357  *
1358  * It is expected that Slave is added before adding Master
1359  * to the Stream.
1360  *
1361  */
1362 int sdw_stream_add_slave(struct sdw_slave *slave,
1363                          struct sdw_stream_config *stream_config,
1364                          struct sdw_port_config *port_config,
1365                          unsigned int num_ports,
1366                          struct sdw_stream_runtime *stream)
1367 {
1368         struct sdw_slave_runtime *s_rt;
1369         struct sdw_master_runtime *m_rt;
1370         int ret;
1371
1372         mutex_lock(&slave->bus->bus_lock);
1373
1374         /*
1375          * If this API is invoked by Slave first then m_rt is not valid.
1376          * So, allocate m_rt and add Slave to it.
1377          */
1378         m_rt = sdw_alloc_master_rt(slave->bus, stream_config, stream);
1379         if (!m_rt) {
1380                 dev_err(&slave->dev,
1381                         "alloc master runtime failed for stream:%s\n",
1382                         stream->name);
1383                 ret = -ENOMEM;
1384                 goto error;
1385         }
1386
1387         s_rt = sdw_alloc_slave_rt(slave, stream_config, stream);
1388         if (!s_rt) {
1389                 dev_err(&slave->dev,
1390                         "Slave runtime config failed for stream:%s\n",
1391                         stream->name);
1392                 ret = -ENOMEM;
1393                 goto stream_error;
1394         }
1395
1396         ret = sdw_config_stream(&slave->dev, stream, stream_config, true);
1397         if (ret) {
1398                 /*
1399                  * sdw_release_master_stream will release s_rt in slave_rt_list in
1400                  * stream_error case, but s_rt is only added to slave_rt_list
1401                  * when sdw_config_stream is successful, so free s_rt explicitly
1402                  * when sdw_config_stream is failed.
1403                  */
1404                 kfree(s_rt);
1405                 goto stream_error;
1406         }
1407
1408         list_add_tail(&s_rt->m_rt_node, &m_rt->slave_rt_list);
1409
1410         ret = sdw_slave_port_config(slave, s_rt, port_config, num_ports);
1411         if (ret)
1412                 goto stream_error;
1413
1414         /*
1415          * Change stream state to CONFIGURED on first Slave add.
1416          * Bus is not aware of number of Slave(s) in a stream at this
1417          * point so cannot depend on all Slave(s) to be added in order to
1418          * change stream state to CONFIGURED.
1419          */
1420         stream->state = SDW_STREAM_CONFIGURED;
1421         goto error;
1422
1423 stream_error:
1424         /*
1425          * we hit error so cleanup the stream, release all Slave(s) and
1426          * Master runtime
1427          */
1428         sdw_release_master_stream(m_rt, stream);
1429 error:
1430         mutex_unlock(&slave->bus->bus_lock);
1431         return ret;
1432 }
1433 EXPORT_SYMBOL(sdw_stream_add_slave);
1434
1435 /**
1436  * sdw_get_slave_dpn_prop() - Get Slave port capabilities
1437  *
1438  * @slave: Slave handle
1439  * @direction: Data direction.
1440  * @port_num: Port number
1441  */
1442 struct sdw_dpn_prop *sdw_get_slave_dpn_prop(struct sdw_slave *slave,
1443                                             enum sdw_data_direction direction,
1444                                             unsigned int port_num)
1445 {
1446         struct sdw_dpn_prop *dpn_prop;
1447         u8 num_ports;
1448         int i;
1449
1450         if (direction == SDW_DATA_DIR_TX) {
1451                 num_ports = hweight32(slave->prop.source_ports);
1452                 dpn_prop = slave->prop.src_dpn_prop;
1453         } else {
1454                 num_ports = hweight32(slave->prop.sink_ports);
1455                 dpn_prop = slave->prop.sink_dpn_prop;
1456         }
1457
1458         for (i = 0; i < num_ports; i++) {
1459                 if (dpn_prop[i].num == port_num)
1460                         return &dpn_prop[i];
1461         }
1462
1463         return NULL;
1464 }
1465
1466 /**
1467  * sdw_acquire_bus_lock: Acquire bus lock for all Master runtime(s)
1468  *
1469  * @stream: SoundWire stream
1470  *
1471  * Acquire bus_lock for each of the master runtime(m_rt) part of this
1472  * stream to reconfigure the bus.
1473  * NOTE: This function is called from SoundWire stream ops and is
1474  * expected that a global lock is held before acquiring bus_lock.
1475  */
1476 static void sdw_acquire_bus_lock(struct sdw_stream_runtime *stream)
1477 {
1478         struct sdw_master_runtime *m_rt;
1479         struct sdw_bus *bus;
1480
1481         /* Iterate for all Master(s) in Master list */
1482         list_for_each_entry(m_rt, &stream->master_list, stream_node) {
1483                 bus = m_rt->bus;
1484
1485                 mutex_lock(&bus->bus_lock);
1486         }
1487 }
1488
1489 /**
1490  * sdw_release_bus_lock: Release bus lock for all Master runtime(s)
1491  *
1492  * @stream: SoundWire stream
1493  *
1494  * Release the previously held bus_lock after reconfiguring the bus.
1495  * NOTE: This function is called from SoundWire stream ops and is
1496  * expected that a global lock is held before releasing bus_lock.
1497  */
1498 static void sdw_release_bus_lock(struct sdw_stream_runtime *stream)
1499 {
1500         struct sdw_master_runtime *m_rt;
1501         struct sdw_bus *bus;
1502
1503         /* Iterate for all Master(s) in Master list */
1504         list_for_each_entry_reverse(m_rt, &stream->master_list, stream_node) {
1505                 bus = m_rt->bus;
1506                 mutex_unlock(&bus->bus_lock);
1507         }
1508 }
1509
1510 static int _sdw_prepare_stream(struct sdw_stream_runtime *stream,
1511                                bool update_params)
1512 {
1513         struct sdw_master_runtime *m_rt;
1514         struct sdw_bus *bus = NULL;
1515         struct sdw_master_prop *prop;
1516         struct sdw_bus_params params;
1517         int ret;
1518
1519         /* Prepare  Master(s) and Slave(s) port(s) associated with stream */
1520         list_for_each_entry(m_rt, &stream->master_list, stream_node) {
1521                 bus = m_rt->bus;
1522                 prop = &bus->prop;
1523                 memcpy(&params, &bus->params, sizeof(params));
1524
1525                 /* TODO: Support Asynchronous mode */
1526                 if ((prop->max_clk_freq % stream->params.rate) != 0) {
1527                         dev_err(bus->dev, "Async mode not supported\n");
1528                         return -EINVAL;
1529                 }
1530
1531                 if (!update_params)
1532                         goto program_params;
1533
1534                 /* Increment cumulative bus bandwidth */
1535                 /* TODO: Update this during Device-Device support */
1536                 bus->params.bandwidth += m_rt->stream->params.rate *
1537                         m_rt->ch_count * m_rt->stream->params.bps;
1538
1539                 /* Compute params */
1540                 if (bus->compute_params) {
1541                         ret = bus->compute_params(bus);
1542                         if (ret < 0) {
1543                                 dev_err(bus->dev, "Compute params failed: %d\n",
1544                                         ret);
1545                                 return ret;
1546                         }
1547                 }
1548
1549 program_params:
1550                 /* Program params */
1551                 ret = sdw_program_params(bus, true);
1552                 if (ret < 0) {
1553                         dev_err(bus->dev, "Program params failed: %d\n", ret);
1554                         goto restore_params;
1555                 }
1556         }
1557
1558         if (!bus) {
1559                 pr_err("Configuration error in %s\n", __func__);
1560                 return -EINVAL;
1561         }
1562
1563         ret = do_bank_switch(stream);
1564         if (ret < 0) {
1565                 dev_err(bus->dev, "Bank switch failed: %d\n", ret);
1566                 goto restore_params;
1567         }
1568
1569         list_for_each_entry(m_rt, &stream->master_list, stream_node) {
1570                 bus = m_rt->bus;
1571
1572                 /* Prepare port(s) on the new clock configuration */
1573                 ret = sdw_prep_deprep_ports(m_rt, true);
1574                 if (ret < 0) {
1575                         dev_err(bus->dev, "Prepare port(s) failed ret = %d\n",
1576                                 ret);
1577                         return ret;
1578                 }
1579         }
1580
1581         stream->state = SDW_STREAM_PREPARED;
1582
1583         return ret;
1584
1585 restore_params:
1586         memcpy(&bus->params, &params, sizeof(params));
1587         return ret;
1588 }
1589
1590 /**
1591  * sdw_prepare_stream() - Prepare SoundWire stream
1592  *
1593  * @stream: Soundwire stream
1594  *
1595  * Documentation/driver-api/soundwire/stream.rst explains this API in detail
1596  */
1597 int sdw_prepare_stream(struct sdw_stream_runtime *stream)
1598 {
1599         bool update_params = true;
1600         int ret;
1601
1602         if (!stream) {
1603                 pr_err("SoundWire: Handle not found for stream\n");
1604                 return -EINVAL;
1605         }
1606
1607         sdw_acquire_bus_lock(stream);
1608
1609         if (stream->state == SDW_STREAM_PREPARED) {
1610                 ret = 0;
1611                 goto state_err;
1612         }
1613
1614         if (stream->state != SDW_STREAM_CONFIGURED &&
1615             stream->state != SDW_STREAM_DEPREPARED &&
1616             stream->state != SDW_STREAM_DISABLED) {
1617                 pr_err("%s: %s: inconsistent state state %d\n",
1618                        __func__, stream->name, stream->state);
1619                 ret = -EINVAL;
1620                 goto state_err;
1621         }
1622
1623         /*
1624          * when the stream is DISABLED, this means sdw_prepare_stream()
1625          * is called as a result of an underflow or a resume operation.
1626          * In this case, the bus parameters shall not be recomputed, but
1627          * still need to be re-applied
1628          */
1629         if (stream->state == SDW_STREAM_DISABLED)
1630                 update_params = false;
1631
1632         ret = _sdw_prepare_stream(stream, update_params);
1633
1634 state_err:
1635         sdw_release_bus_lock(stream);
1636         return ret;
1637 }
1638 EXPORT_SYMBOL(sdw_prepare_stream);
1639
1640 static int _sdw_enable_stream(struct sdw_stream_runtime *stream)
1641 {
1642         struct sdw_master_runtime *m_rt;
1643         struct sdw_bus *bus = NULL;
1644         int ret;
1645
1646         /* Enable Master(s) and Slave(s) port(s) associated with stream */
1647         list_for_each_entry(m_rt, &stream->master_list, stream_node) {
1648                 bus = m_rt->bus;
1649
1650                 /* Program params */
1651                 ret = sdw_program_params(bus, false);
1652                 if (ret < 0) {
1653                         dev_err(bus->dev, "Program params failed: %d\n", ret);
1654                         return ret;
1655                 }
1656
1657                 /* Enable port(s) */
1658                 ret = sdw_enable_disable_ports(m_rt, true);
1659                 if (ret < 0) {
1660                         dev_err(bus->dev,
1661                                 "Enable port(s) failed ret: %d\n", ret);
1662                         return ret;
1663                 }
1664         }
1665
1666         if (!bus) {
1667                 pr_err("Configuration error in %s\n", __func__);
1668                 return -EINVAL;
1669         }
1670
1671         ret = do_bank_switch(stream);
1672         if (ret < 0) {
1673                 dev_err(bus->dev, "Bank switch failed: %d\n", ret);
1674                 return ret;
1675         }
1676
1677         stream->state = SDW_STREAM_ENABLED;
1678         return 0;
1679 }
1680
1681 /**
1682  * sdw_enable_stream() - Enable SoundWire stream
1683  *
1684  * @stream: Soundwire stream
1685  *
1686  * Documentation/driver-api/soundwire/stream.rst explains this API in detail
1687  */
1688 int sdw_enable_stream(struct sdw_stream_runtime *stream)
1689 {
1690         int ret;
1691
1692         if (!stream) {
1693                 pr_err("SoundWire: Handle not found for stream\n");
1694                 return -EINVAL;
1695         }
1696
1697         sdw_acquire_bus_lock(stream);
1698
1699         if (stream->state != SDW_STREAM_PREPARED &&
1700             stream->state != SDW_STREAM_DISABLED) {
1701                 pr_err("%s: %s: inconsistent state state %d\n",
1702                        __func__, stream->name, stream->state);
1703                 ret = -EINVAL;
1704                 goto state_err;
1705         }
1706
1707         ret = _sdw_enable_stream(stream);
1708
1709 state_err:
1710         sdw_release_bus_lock(stream);
1711         return ret;
1712 }
1713 EXPORT_SYMBOL(sdw_enable_stream);
1714
1715 static int _sdw_disable_stream(struct sdw_stream_runtime *stream)
1716 {
1717         struct sdw_master_runtime *m_rt;
1718         int ret;
1719
1720         list_for_each_entry(m_rt, &stream->master_list, stream_node) {
1721                 struct sdw_bus *bus = m_rt->bus;
1722
1723                 /* Disable port(s) */
1724                 ret = sdw_enable_disable_ports(m_rt, false);
1725                 if (ret < 0) {
1726                         dev_err(bus->dev, "Disable port(s) failed: %d\n", ret);
1727                         return ret;
1728                 }
1729         }
1730         stream->state = SDW_STREAM_DISABLED;
1731
1732         list_for_each_entry(m_rt, &stream->master_list, stream_node) {
1733                 struct sdw_bus *bus = m_rt->bus;
1734
1735                 /* Program params */
1736                 ret = sdw_program_params(bus, false);
1737                 if (ret < 0) {
1738                         dev_err(bus->dev, "Program params failed: %d\n", ret);
1739                         return ret;
1740                 }
1741         }
1742
1743         ret = do_bank_switch(stream);
1744         if (ret < 0) {
1745                 pr_err("Bank switch failed: %d\n", ret);
1746                 return ret;
1747         }
1748
1749         /* make sure alternate bank (previous current) is also disabled */
1750         list_for_each_entry(m_rt, &stream->master_list, stream_node) {
1751                 struct sdw_bus *bus = m_rt->bus;
1752
1753                 /* Disable port(s) */
1754                 ret = sdw_enable_disable_ports(m_rt, false);
1755                 if (ret < 0) {
1756                         dev_err(bus->dev, "Disable port(s) failed: %d\n", ret);
1757                         return ret;
1758                 }
1759         }
1760
1761         return 0;
1762 }
1763
1764 /**
1765  * sdw_disable_stream() - Disable SoundWire stream
1766  *
1767  * @stream: Soundwire stream
1768  *
1769  * Documentation/driver-api/soundwire/stream.rst explains this API in detail
1770  */
1771 int sdw_disable_stream(struct sdw_stream_runtime *stream)
1772 {
1773         int ret;
1774
1775         if (!stream) {
1776                 pr_err("SoundWire: Handle not found for stream\n");
1777                 return -EINVAL;
1778         }
1779
1780         sdw_acquire_bus_lock(stream);
1781
1782         if (stream->state != SDW_STREAM_ENABLED) {
1783                 pr_err("%s: %s: inconsistent state state %d\n",
1784                        __func__, stream->name, stream->state);
1785                 ret = -EINVAL;
1786                 goto state_err;
1787         }
1788
1789         ret = _sdw_disable_stream(stream);
1790
1791 state_err:
1792         sdw_release_bus_lock(stream);
1793         return ret;
1794 }
1795 EXPORT_SYMBOL(sdw_disable_stream);
1796
1797 static int _sdw_deprepare_stream(struct sdw_stream_runtime *stream)
1798 {
1799         struct sdw_master_runtime *m_rt;
1800         struct sdw_bus *bus;
1801         int ret = 0;
1802
1803         list_for_each_entry(m_rt, &stream->master_list, stream_node) {
1804                 bus = m_rt->bus;
1805                 /* De-prepare port(s) */
1806                 ret = sdw_prep_deprep_ports(m_rt, false);
1807                 if (ret < 0) {
1808                         dev_err(bus->dev,
1809                                 "De-prepare port(s) failed: %d\n", ret);
1810                         return ret;
1811                 }
1812
1813                 /* TODO: Update this during Device-Device support */
1814                 bus->params.bandwidth -= m_rt->stream->params.rate *
1815                         m_rt->ch_count * m_rt->stream->params.bps;
1816
1817                 /* Compute params */
1818                 if (bus->compute_params) {
1819                         ret = bus->compute_params(bus);
1820                         if (ret < 0) {
1821                                 dev_err(bus->dev, "Compute params failed: %d\n",
1822                                         ret);
1823                                 return ret;
1824                         }
1825                 }
1826
1827                 /* Program params */
1828                 ret = sdw_program_params(bus, false);
1829                 if (ret < 0) {
1830                         dev_err(bus->dev, "Program params failed: %d\n", ret);
1831                         return ret;
1832                 }
1833         }
1834
1835         stream->state = SDW_STREAM_DEPREPARED;
1836         return do_bank_switch(stream);
1837 }
1838
1839 /**
1840  * sdw_deprepare_stream() - Deprepare SoundWire stream
1841  *
1842  * @stream: Soundwire stream
1843  *
1844  * Documentation/driver-api/soundwire/stream.rst explains this API in detail
1845  */
1846 int sdw_deprepare_stream(struct sdw_stream_runtime *stream)
1847 {
1848         int ret;
1849
1850         if (!stream) {
1851                 pr_err("SoundWire: Handle not found for stream\n");
1852                 return -EINVAL;
1853         }
1854
1855         sdw_acquire_bus_lock(stream);
1856
1857         if (stream->state != SDW_STREAM_PREPARED &&
1858             stream->state != SDW_STREAM_DISABLED) {
1859                 pr_err("%s: %s: inconsistent state state %d\n",
1860                        __func__, stream->name, stream->state);
1861                 ret = -EINVAL;
1862                 goto state_err;
1863         }
1864
1865         ret = _sdw_deprepare_stream(stream);
1866
1867 state_err:
1868         sdw_release_bus_lock(stream);
1869         return ret;
1870 }
1871 EXPORT_SYMBOL(sdw_deprepare_stream);
1872
1873 static int set_stream(struct snd_pcm_substream *substream,
1874                       struct sdw_stream_runtime *sdw_stream)
1875 {
1876         struct snd_soc_pcm_runtime *rtd = substream->private_data;
1877         struct snd_soc_dai *dai;
1878         int ret = 0;
1879         int i;
1880
1881         /* Set stream pointer on all DAIs */
1882         for_each_rtd_dais(rtd, i, dai) {
1883                 ret = snd_soc_dai_set_sdw_stream(dai, sdw_stream, substream->stream);
1884                 if (ret < 0) {
1885                         dev_err(rtd->dev, "failed to set stream pointer on dai %s\n", dai->name);
1886                         break;
1887                 }
1888         }
1889
1890         return ret;
1891 }
1892
1893 /**
1894  * sdw_startup_stream() - Startup SoundWire stream
1895  *
1896  * @sdw_substream: Soundwire stream
1897  *
1898  * Documentation/driver-api/soundwire/stream.rst explains this API in detail
1899  */
1900 int sdw_startup_stream(void *sdw_substream)
1901 {
1902         struct snd_pcm_substream *substream = sdw_substream;
1903         struct snd_soc_pcm_runtime *rtd = substream->private_data;
1904         struct sdw_stream_runtime *sdw_stream;
1905         char *name;
1906         int ret;
1907
1908         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
1909                 name = kasprintf(GFP_KERNEL, "%s-Playback", substream->name);
1910         else
1911                 name = kasprintf(GFP_KERNEL, "%s-Capture", substream->name);
1912
1913         if (!name)
1914                 return -ENOMEM;
1915
1916         sdw_stream = sdw_alloc_stream(name);
1917         if (!sdw_stream) {
1918                 dev_err(rtd->dev, "alloc stream failed for substream DAI %s\n", substream->name);
1919                 ret = -ENOMEM;
1920                 goto error;
1921         }
1922
1923         ret = set_stream(substream, sdw_stream);
1924         if (ret < 0)
1925                 goto release_stream;
1926         return 0;
1927
1928 release_stream:
1929         sdw_release_stream(sdw_stream);
1930         set_stream(substream, NULL);
1931 error:
1932         kfree(name);
1933         return ret;
1934 }
1935 EXPORT_SYMBOL(sdw_startup_stream);
1936
1937 /**
1938  * sdw_shutdown_stream() - Shutdown SoundWire stream
1939  *
1940  * @sdw_substream: Soundwire stream
1941  *
1942  * Documentation/driver-api/soundwire/stream.rst explains this API in detail
1943  */
1944 void sdw_shutdown_stream(void *sdw_substream)
1945 {
1946         struct snd_pcm_substream *substream = sdw_substream;
1947         struct snd_soc_pcm_runtime *rtd = substream->private_data;
1948         struct sdw_stream_runtime *sdw_stream;
1949         struct snd_soc_dai *dai;
1950
1951         /* Find stream from first CPU DAI */
1952         dai = asoc_rtd_to_cpu(rtd, 0);
1953
1954         sdw_stream = snd_soc_dai_get_sdw_stream(dai, substream->stream);
1955
1956         if (IS_ERR(sdw_stream)) {
1957                 dev_err(rtd->dev, "no stream found for DAI %s\n", dai->name);
1958                 return;
1959         }
1960
1961         /* release memory */
1962         kfree(sdw_stream->name);
1963         sdw_release_stream(sdw_stream);
1964
1965         /* clear DAI data */
1966         set_stream(substream, NULL);
1967 }
1968 EXPORT_SYMBOL(sdw_shutdown_stream);