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 EXPORT_SYMBOL(sdw_rows);
  29
  30 int sdw_cols[SDW_FRAME_COLS] = {2, 4, 6, 8, 10, 12, 14, 16};
  31 EXPORT_SYMBOL(sdw_cols);
  32
  33 int sdw_find_col_index(int col)
  34 {
  35         int i;
  36
  37         for (i = 0; i < SDW_FRAME_COLS; i++) {
  38                 if (sdw_cols[i] == col)
  39                         return i;
  40         }
  41
  42         pr_warn("Requested column not found, selecting lowest column no: 2\n");
  43         return 0;
  44 }
  45 EXPORT_SYMBOL(sdw_find_col_index);
  46
  47 int sdw_find_row_index(int row)
  48 {
  49         int i;
  50
  51         for (i = 0; i < SDW_FRAME_ROWS; i++) {
  52                 if (sdw_rows[i] == row)
  53                         return i;
  54         }
  55
  56         pr_warn("Requested row not found, selecting lowest row no: 48\n");
  57         return 0;
  58 }
  59 EXPORT_SYMBOL(sdw_find_row_index);
  60
  61 static int _sdw_program_slave_port_params(struct sdw_bus *bus,
  62                                           struct sdw_slave *slave,
  63                                           struct sdw_transport_params *t_params,
  64                                           enum sdw_dpn_type type)
  65 {
  66         u32 addr1, addr2, addr3, addr4;
  67         int ret;
  68         u16 wbuf;
  69
  70         if (bus->params.next_bank) {
  71                 addr1 = SDW_DPN_OFFSETCTRL2_B1(t_params->port_num);
  72                 addr2 = SDW_DPN_BLOCKCTRL3_B1(t_params->port_num);
  73                 addr3 = SDW_DPN_SAMPLECTRL2_B1(t_params->port_num);
  74                 addr4 = SDW_DPN_HCTRL_B1(t_params->port_num);
  75         } else {
  76                 addr1 = SDW_DPN_OFFSETCTRL2_B0(t_params->port_num);
  77                 addr2 = SDW_DPN_BLOCKCTRL3_B0(t_params->port_num);
  78                 addr3 = SDW_DPN_SAMPLECTRL2_B0(t_params->port_num);
  79                 addr4 = SDW_DPN_HCTRL_B0(t_params->port_num);
  80         }
  81
  82         /* Program DPN_OffsetCtrl2 registers */
  83         ret = sdw_write(slave, addr1, t_params->offset2);
  84         if (ret < 0) {
  85                 dev_err(bus->dev, "DPN_OffsetCtrl2 register write failed\n");
  86                 return ret;
  87         }
  88
  89         /* Program DPN_BlockCtrl3 register */
  90         ret = sdw_write(slave, addr2, t_params->blk_pkg_mode);
  91         if (ret < 0) {
  92                 dev_err(bus->dev, "DPN_BlockCtrl3 register write failed\n");
  93                 return ret;
  94         }
  95
  96         /*
  97          * Data ports are FULL, SIMPLE and REDUCED. This function handles
  98          * FULL and REDUCED only and beyond this point only FULL is
  99          * handled, so bail out if we are not FULL data port type
 100          */
 101         if (type != SDW_DPN_FULL)
 102                 return ret;
 103
 104         /* Program DPN_SampleCtrl2 register */
 105         wbuf = FIELD_GET(SDW_DPN_SAMPLECTRL_HIGH, t_params->sample_interval - 1);
 106
 107         ret = sdw_write(slave, addr3, wbuf);
 108         if (ret < 0) {
 109                 dev_err(bus->dev, "DPN_SampleCtrl2 register write failed\n");
 110                 return ret;
 111         }
 112
 113         /* Program DPN_HCtrl register */
 114         wbuf = FIELD_PREP(SDW_DPN_HCTRL_HSTART, t_params->hstart);
 115         wbuf |= FIELD_PREP(SDW_DPN_HCTRL_HSTOP, t_params->hstop);
 116
 117         ret = sdw_write(slave, addr4, wbuf);
 118         if (ret < 0)
 119                 dev_err(bus->dev, "DPN_HCtrl register write failed\n");
 120
 121         return ret;
 122 }
 123
 124 static int sdw_program_slave_port_params(struct sdw_bus *bus,
 125                                          struct sdw_slave_runtime *s_rt,
 126                                          struct sdw_port_runtime *p_rt)
 127 {
 128         struct sdw_transport_params *t_params = &p_rt->transport_params;
 129         struct sdw_port_params *p_params = &p_rt->port_params;
 130         struct sdw_slave_prop *slave_prop = &s_rt->slave->prop;
 131         u32 addr1, addr2, addr3, addr4, addr5, addr6;
 132         struct sdw_dpn_prop *dpn_prop;
 133         int ret;
 134         u8 wbuf;
 135
 136         dpn_prop = sdw_get_slave_dpn_prop(s_rt->slave,
 137                                           s_rt->direction,
 138                                           t_params->port_num);
 139         if (!dpn_prop)
 140                 return -EINVAL;
 141
 142         addr1 = SDW_DPN_PORTCTRL(t_params->port_num);
 143         addr2 = SDW_DPN_BLOCKCTRL1(t_params->port_num);
 144
 145         if (bus->params.next_bank) {
 146                 addr3 = SDW_DPN_SAMPLECTRL1_B1(t_params->port_num);
 147                 addr4 = SDW_DPN_OFFSETCTRL1_B1(t_params->port_num);
 148                 addr5 = SDW_DPN_BLOCKCTRL2_B1(t_params->port_num);
 149                 addr6 = SDW_DPN_LANECTRL_B1(t_params->port_num);
 150
 151         } else {
 152                 addr3 = SDW_DPN_SAMPLECTRL1_B0(t_params->port_num);
 153                 addr4 = SDW_DPN_OFFSETCTRL1_B0(t_params->port_num);
 154                 addr5 = SDW_DPN_BLOCKCTRL2_B0(t_params->port_num);
 155                 addr6 = SDW_DPN_LANECTRL_B0(t_params->port_num);
 156         }
 157
 158         /* Program DPN_PortCtrl register */
 159         wbuf = FIELD_PREP(SDW_DPN_PORTCTRL_DATAMODE, p_params->data_mode);
 160         wbuf |= FIELD_PREP(SDW_DPN_PORTCTRL_FLOWMODE, p_params->flow_mode);
 161
 162         ret = sdw_update(s_rt->slave, addr1, 0xF, wbuf);
 163         if (ret < 0) {
 164                 dev_err(&s_rt->slave->dev,
 165                         "DPN_PortCtrl register write failed for port %d\n",
 166                         t_params->port_num);
 167                 return ret;
 168         }
 169
 170         if (!dpn_prop->read_only_wordlength) {
 171                 /* Program DPN_BlockCtrl1 register */
 172                 ret = sdw_write(s_rt->slave, addr2, (p_params->bps - 1));
 173                 if (ret < 0) {
 174                         dev_err(&s_rt->slave->dev,
 175                                 "DPN_BlockCtrl1 register write failed for port %d\n",
 176                                 t_params->port_num);
 177                         return ret;
 178                 }
 179         }
 180
 181         /* Program DPN_SampleCtrl1 register */
 182         wbuf = (t_params->sample_interval - 1) & SDW_DPN_SAMPLECTRL_LOW;
 183         ret = sdw_write(s_rt->slave, addr3, wbuf);
 184         if (ret < 0) {
 185                 dev_err(&s_rt->slave->dev,
 186                         "DPN_SampleCtrl1 register write failed for port %d\n",
 187                         t_params->port_num);
 188                 return ret;
 189         }
 190
 191         /* Program DPN_OffsetCtrl1 registers */
 192         ret = sdw_write(s_rt->slave, addr4, t_params->offset1);
 193         if (ret < 0) {
 194                 dev_err(&s_rt->slave->dev,
 195                         "DPN_OffsetCtrl1 register write failed for port %d\n",
 196                         t_params->port_num);
 197                 return ret;
 198         }
 199
 200         /* Program DPN_BlockCtrl2 register*/
 201         if (t_params->blk_grp_ctrl_valid) {
 202                 ret = sdw_write(s_rt->slave, addr5, t_params->blk_grp_ctrl);
 203                 if (ret < 0) {
 204                         dev_err(&s_rt->slave->dev,
 205                                 "DPN_BlockCtrl2 reg write failed for port %d\n",
 206                                 t_params->port_num);
 207                         return ret;
 208                 }
 209         }
 210
 211         /* program DPN_LaneCtrl register */
 212         if (slave_prop->lane_control_support) {
 213                 ret = sdw_write(s_rt->slave, addr6, t_params->lane_ctrl);
 214                 if (ret < 0) {
 215                         dev_err(&s_rt->slave->dev,
 216                                 "DPN_LaneCtrl register write failed for port %d\n",
 217                                 t_params->port_num);
 218                         return ret;
 219                 }
 220         }
 221
 222         if (dpn_prop->type != SDW_DPN_SIMPLE) {
 223                 ret = _sdw_program_slave_port_params(bus, s_rt->slave,
 224                                                      t_params, dpn_prop->type);
 225                 if (ret < 0)
 226                         dev_err(&s_rt->slave->dev,
 227                                 "Transport reg write failed for port: %d\n",
 228                                 t_params->port_num);
 229         }
 230
 231         return ret;
 232 }
 233
 234 static int sdw_program_master_port_params(struct sdw_bus *bus,
 235                                           struct sdw_port_runtime *p_rt)
 236 {
 237         int ret;
 238
 239         /*
 240          * we need to set transport and port parameters for the port.
 241          * Transport parameters refers to the sample interval, offsets and
 242          * hstart/stop etc of the data. Port parameters refers to word
 243          * length, flow mode etc of the port
 244          */
 245         ret = bus->port_ops->dpn_set_port_transport_params(bus,
 246                                         &p_rt->transport_params,
 247                                         bus->params.next_bank);
 248         if (ret < 0)
 249                 return ret;
 250
 251         return bus->port_ops->dpn_set_port_params(bus,
 252                                                   &p_rt->port_params,
 253                                                   bus->params.next_bank);
 254 }
 255
 256 /**
 257  * sdw_program_port_params() - Programs transport parameters of Master(s)
 258  * and Slave(s)
 259  *
 260  * @m_rt: Master stream runtime
 261  */
 262 static int sdw_program_port_params(struct sdw_master_runtime *m_rt)
 263 {
 264         struct sdw_slave_runtime *s_rt = NULL;
 265         struct sdw_bus *bus = m_rt->bus;
 266         struct sdw_port_runtime *p_rt;
 267         int ret = 0;
 268
 269         /* Program transport & port parameters for Slave(s) */
 270         list_for_each_entry(s_rt, &m_rt->slave_rt_list, m_rt_node) {
 271                 list_for_each_entry(p_rt, &s_rt->port_list, port_node) {
 272                         ret = sdw_program_slave_port_params(bus, s_rt, p_rt);
 273                         if (ret < 0)
 274                                 return ret;
 275                 }
 276         }
 277
 278         /* Program transport & port parameters for Master(s) */
 279         list_for_each_entry(p_rt, &m_rt->port_list, port_node) {
 280                 ret = sdw_program_master_port_params(bus, p_rt);
 281                 if (ret < 0)
 282                         return ret;
 283         }
 284
 285         return 0;
 286 }
 287
 288 /**
 289  * sdw_enable_disable_slave_ports: Enable/disable slave data port
 290  *
 291  * @bus: bus instance
 292  * @s_rt: slave runtime
 293  * @p_rt: port runtime
 294  * @en: enable or disable operation
 295  *
 296  * This function only sets the enable/disable bits in the relevant bank, the
 297  * actual enable/disable is done with a bank switch
 298  */
 299 static int sdw_enable_disable_slave_ports(struct sdw_bus *bus,
 300                                           struct sdw_slave_runtime *s_rt,
 301                                           struct sdw_port_runtime *p_rt,
 302                                           bool en)
 303 {
 304         struct sdw_transport_params *t_params = &p_rt->transport_params;
 305         u32 addr;
 306         int ret;
 307
 308         if (bus->params.next_bank)
 309                 addr = SDW_DPN_CHANNELEN_B1(p_rt->num);
 310         else
 311                 addr = SDW_DPN_CHANNELEN_B0(p_rt->num);
 312
 313         /*
 314          * Since bus doesn't support sharing a port across two streams,
 315          * it is safe to reset this register
 316          */
 317         if (en)
 318                 ret = sdw_write(s_rt->slave, addr, p_rt->ch_mask);
 319         else
 320                 ret = sdw_write(s_rt->slave, addr, 0x0);
 321
 322         if (ret < 0)
 323                 dev_err(&s_rt->slave->dev,
 324                         "Slave chn_en reg write failed:%d port:%d\n",
 325                         ret, t_params->port_num);
 326
 327         return ret;
 328 }
 329
 330 static int sdw_enable_disable_master_ports(struct sdw_master_runtime *m_rt,
 331                                            struct sdw_port_runtime *p_rt,
 332                                            bool en)
 333 {
 334         struct sdw_transport_params *t_params = &p_rt->transport_params;
 335         struct sdw_bus *bus = m_rt->bus;
 336         struct sdw_enable_ch enable_ch;
 337         int ret;
 338
 339         enable_ch.port_num = p_rt->num;
 340         enable_ch.ch_mask = p_rt->ch_mask;
 341         enable_ch.enable = en;
 342
 343         /* Perform Master port channel(s) enable/disable */
 344         if (bus->port_ops->dpn_port_enable_ch) {
 345                 ret = bus->port_ops->dpn_port_enable_ch(bus,
 346                                                         &enable_ch,
 347                                                         bus->params.next_bank);
 348                 if (ret < 0) {
 349                         dev_err(bus->dev,
 350                                 "Master chn_en write failed:%d port:%d\n",
 351                                 ret, t_params->port_num);
 352                         return ret;
 353                 }
 354         } else {
 355                 dev_err(bus->dev,
 356                         "dpn_port_enable_ch not supported, %s failed\n",
 357                         en ? "enable" : "disable");
 358                 return -EINVAL;
 359         }
 360
 361         return 0;
 362 }
 363
 364 /**
 365  * sdw_enable_disable_ports() - Enable/disable port(s) for Master and
 366  * Slave(s)
 367  *
 368  * @m_rt: Master stream runtime
 369  * @en: mode (enable/disable)
 370  */
 371 static int sdw_enable_disable_ports(struct sdw_master_runtime *m_rt, bool en)
 372 {
 373         struct sdw_port_runtime *s_port, *m_port;
 374         struct sdw_slave_runtime *s_rt;
 375         int ret = 0;
 376
 377         /* Enable/Disable Slave port(s) */
 378         list_for_each_entry(s_rt, &m_rt->slave_rt_list, m_rt_node) {
 379                 list_for_each_entry(s_port, &s_rt->port_list, port_node) {
 380                         ret = sdw_enable_disable_slave_ports(m_rt->bus, s_rt,
 381                                                              s_port, en);
 382                         if (ret < 0)
 383                                 return ret;
 384                 }
 385         }
 386
 387         /* Enable/Disable Master port(s) */
 388         list_for_each_entry(m_port, &m_rt->port_list, port_node) {
 389                 ret = sdw_enable_disable_master_ports(m_rt, m_port, en);
 390                 if (ret < 0)
 391                         return ret;
 392         }
 393
 394         return 0;
 395 }
 396
 397 static int sdw_do_port_prep(struct sdw_slave_runtime *s_rt,
 398                             struct sdw_prepare_ch prep_ch,
 399                             enum sdw_port_prep_ops cmd)
 400 {
 401         const struct sdw_slave_ops *ops = s_rt->slave->ops;
 402         int ret;
 403
 404         if (ops->port_prep) {
 405                 ret = ops->port_prep(s_rt->slave, &prep_ch, cmd);
 406                 if (ret < 0) {
 407                         dev_err(&s_rt->slave->dev,
 408                                 "Slave Port Prep cmd %d failed: %d\n",
 409                                 cmd, ret);
 410                         return ret;
 411                 }
 412         }
 413
 414         return 0;
 415 }
 416
 417 static int sdw_prep_deprep_slave_ports(struct sdw_bus *bus,
 418                                        struct sdw_slave_runtime *s_rt,
 419                                        struct sdw_port_runtime *p_rt,
 420                                        bool prep)
 421 {
 422         struct completion *port_ready;
 423         struct sdw_dpn_prop *dpn_prop;
 424         struct sdw_prepare_ch prep_ch;
 425         bool intr = false;
 426         int ret = 0, val;
 427         u32 addr;
 428
 429         prep_ch.num = p_rt->num;
 430         prep_ch.ch_mask = p_rt->ch_mask;
 431
 432         dpn_prop = sdw_get_slave_dpn_prop(s_rt->slave,
 433                                           s_rt->direction,
 434                                           prep_ch.num);
 435         if (!dpn_prop) {
 436                 dev_err(bus->dev,
 437                         "Slave Port:%d properties not found\n", prep_ch.num);
 438                 return -EINVAL;
 439         }
 440
 441         prep_ch.prepare = prep;
 442
 443         prep_ch.bank = bus->params.next_bank;
 444
 445         if (dpn_prop->imp_def_interrupts || !dpn_prop->simple_ch_prep_sm ||
 446             bus->params.s_data_mode != SDW_PORT_DATA_MODE_NORMAL)
 447                 intr = true;
 448
 449         /*
 450          * Enable interrupt before Port prepare.
 451          * For Port de-prepare, it is assumed that port
 452          * was prepared earlier
 453          */
 454         if (prep && intr) {
 455                 ret = sdw_configure_dpn_intr(s_rt->slave, p_rt->num, prep,
 456                                              dpn_prop->imp_def_interrupts);
 457                 if (ret < 0)
 458                         return ret;
 459         }
 460
 461         /* Inform slave about the impending port prepare */
 462         sdw_do_port_prep(s_rt, prep_ch, SDW_OPS_PORT_PRE_PREP);
 463
 464         /* Prepare Slave port implementing CP_SM */
 465         if (!dpn_prop->simple_ch_prep_sm) {
 466                 addr = SDW_DPN_PREPARECTRL(p_rt->num);
 467
 468                 if (prep)
 469                         ret = sdw_write(s_rt->slave, addr, p_rt->ch_mask);
 470                 else
 471                         ret = sdw_write(s_rt->slave, addr, 0x0);
 472
 473                 if (ret < 0) {
 474                         dev_err(&s_rt->slave->dev,
 475                                 "Slave prep_ctrl reg write failed\n");
 476                         return ret;
 477                 }
 478
 479                 /* Wait for completion on port ready */
 480                 port_ready = &s_rt->slave->port_ready[prep_ch.num];
 481                 wait_for_completion_timeout(port_ready,
 482                         msecs_to_jiffies(dpn_prop->ch_prep_timeout));
 483
 484                 val = sdw_read(s_rt->slave, SDW_DPN_PREPARESTATUS(p_rt->num));
 485                 if ((val < 0) || (val & p_rt->ch_mask)) {
 486                         ret = (val < 0) ? val : -ETIMEDOUT;
 487                         dev_err(&s_rt->slave->dev,
 488                                 "Chn prep failed for port %d: %d\n", prep_ch.num, ret);
 489                         return ret;
 490                 }
 491         }
 492
 493         /* Inform slaves about ports prepared */
 494         sdw_do_port_prep(s_rt, prep_ch, SDW_OPS_PORT_POST_PREP);
 495
 496         /* Disable interrupt after Port de-prepare */
 497         if (!prep && intr)
 498                 ret = sdw_configure_dpn_intr(s_rt->slave, p_rt->num, prep,
 499                                              dpn_prop->imp_def_interrupts);
 500
 501         return ret;
 502 }
 503
 504 static int sdw_prep_deprep_master_ports(struct sdw_master_runtime *m_rt,
 505                                         struct sdw_port_runtime *p_rt,
 506                                         bool prep)
 507 {
 508         struct sdw_transport_params *t_params = &p_rt->transport_params;
 509         struct sdw_bus *bus = m_rt->bus;
 510         const struct sdw_master_port_ops *ops = bus->port_ops;
 511         struct sdw_prepare_ch prep_ch;
 512         int ret = 0;
 513
 514         prep_ch.num = p_rt->num;
 515         prep_ch.ch_mask = p_rt->ch_mask;
 516         prep_ch.prepare = prep; /* Prepare/De-prepare */
 517         prep_ch.bank = bus->params.next_bank;
 518
 519         /* Pre-prepare/Pre-deprepare port(s) */
 520         if (ops->dpn_port_prep) {
 521                 ret = ops->dpn_port_prep(bus, &prep_ch);
 522                 if (ret < 0) {
 523                         dev_err(bus->dev, "Port prepare failed for port:%d\n",
 524                                 t_params->port_num);
 525                         return ret;
 526                 }
 527         }
 528
 529         return ret;
 530 }
 531
 532 /**
 533  * sdw_prep_deprep_ports() - Prepare/De-prepare port(s) for Master(s) and
 534  * Slave(s)
 535  *
 536  * @m_rt: Master runtime handle
 537  * @prep: Prepare or De-prepare
 538  */
 539 static int sdw_prep_deprep_ports(struct sdw_master_runtime *m_rt, bool prep)
 540 {
 541         struct sdw_slave_runtime *s_rt;
 542         struct sdw_port_runtime *p_rt;
 543         int ret = 0;
 544
 545         /* Prepare/De-prepare Slave port(s) */
 546         list_for_each_entry(s_rt, &m_rt->slave_rt_list, m_rt_node) {
 547                 list_for_each_entry(p_rt, &s_rt->port_list, port_node) {
 548                         ret = sdw_prep_deprep_slave_ports(m_rt->bus, s_rt,
 549                                                           p_rt, prep);
 550                         if (ret < 0)
 551                                 return ret;
 552                 }
 553         }
 554
 555         /* Prepare/De-prepare Master port(s) */
 556         list_for_each_entry(p_rt, &m_rt->port_list, port_node) {
 557                 ret = sdw_prep_deprep_master_ports(m_rt, p_rt, prep);
 558                 if (ret < 0)
 559                         return ret;
 560         }
 561
 562         return ret;
 563 }
 564
 565 /**
 566  * sdw_notify_config() - Notify bus configuration
 567  *
 568  * @m_rt: Master runtime handle
 569  *
 570  * This function notifies the Master(s) and Slave(s) of the
 571  * new bus configuration.
 572  */
 573 static int sdw_notify_config(struct sdw_master_runtime *m_rt)
 574 {
 575         struct sdw_slave_runtime *s_rt;
 576         struct sdw_bus *bus = m_rt->bus;
 577         struct sdw_slave *slave;
 578         int ret = 0;
 579
 580         if (bus->ops->set_bus_conf) {
 581                 ret = bus->ops->set_bus_conf(bus, &bus->params);
 582                 if (ret < 0)
 583                         return ret;
 584         }
 585
 586         list_for_each_entry(s_rt, &m_rt->slave_rt_list, m_rt_node) {
 587                 slave = s_rt->slave;
 588
 589                 if (slave->ops->bus_config) {
 590                         ret = slave->ops->bus_config(slave, &bus->params);
 591                         if (ret < 0) {
 592                                 dev_err(bus->dev, "Notify Slave: %d failed\n",
 593                                         slave->dev_num);
 594                                 return ret;
 595                         }
 596                 }
 597         }
 598
 599         return ret;
 600 }
 601
 602 /**
 603  * sdw_program_params() - Program transport and port parameters for Master(s)
 604  * and Slave(s)
 605  *
 606  * @bus: SDW bus instance
 607  * @prepare: true if sdw_program_params() is called by _prepare.
 608  */
 609 static int sdw_program_params(struct sdw_bus *bus, bool prepare)
 610 {
 611         struct sdw_master_runtime *m_rt;
 612         int ret = 0;
 613
 614         list_for_each_entry(m_rt, &bus->m_rt_list, bus_node) {
 615
 616                 /*
 617                  * this loop walks through all master runtimes for a
 618                  * bus, but the ports can only be configured while
 619                  * explicitly preparing a stream or handling an
 620                  * already-prepared stream otherwise.
 621                  */
 622                 if (!prepare &&
 623                     m_rt->stream->state == SDW_STREAM_CONFIGURED)
 624                         continue;
 625
 626                 ret = sdw_program_port_params(m_rt);
 627                 if (ret < 0) {
 628                         dev_err(bus->dev,
 629                                 "Program transport params failed: %d\n", ret);
 630                         return ret;
 631                 }
 632
 633                 ret = sdw_notify_config(m_rt);
 634                 if (ret < 0) {
 635                         dev_err(bus->dev,
 636                                 "Notify bus config failed: %d\n", ret);
 637                         return ret;
 638                 }
 639
 640                 /* Enable port(s) on alternate bank for all active streams */
 641                 if (m_rt->stream->state != SDW_STREAM_ENABLED)
 642                         continue;
 643
 644                 ret = sdw_enable_disable_ports(m_rt, true);
 645                 if (ret < 0) {
 646                         dev_err(bus->dev, "Enable channel failed: %d\n", ret);
 647                         return ret;
 648                 }
 649         }
 650
 651         return ret;
 652 }
 653
 654 static int sdw_bank_switch(struct sdw_bus *bus, int m_rt_count)
 655 {
 656         int col_index, row_index;
 657         bool multi_link;
 658         struct sdw_msg *wr_msg;
 659         u8 *wbuf;
 660         int ret;
 661         u16 addr;
 662
 663         wr_msg = kzalloc(sizeof(*wr_msg), GFP_KERNEL);
 664         if (!wr_msg)
 665                 return -ENOMEM;
 666
 667         bus->defer_msg.msg = wr_msg;
 668
 669         wbuf = kzalloc(sizeof(*wbuf), GFP_KERNEL);
 670         if (!wbuf) {
 671                 ret = -ENOMEM;
 672                 goto error_1;
 673         }
 674
 675         /* Get row and column index to program register */
 676         col_index = sdw_find_col_index(bus->params.col);
 677         row_index = sdw_find_row_index(bus->params.row);
 678         wbuf[0] = col_index | (row_index << 3);
 679
 680         if (bus->params.next_bank)
 681                 addr = SDW_SCP_FRAMECTRL_B1;
 682         else
 683                 addr = SDW_SCP_FRAMECTRL_B0;
 684
 685         sdw_fill_msg(wr_msg, NULL, addr, 1, SDW_BROADCAST_DEV_NUM,
 686                      SDW_MSG_FLAG_WRITE, wbuf);
 687         wr_msg->ssp_sync = true;
 688
 689         /*
 690          * Set the multi_link flag only when both the hardware supports
 691          * and hardware-based sync is required
 692          */
 693         multi_link = bus->multi_link && (m_rt_count >= bus->hw_sync_min_links);
 694
 695         if (multi_link)
 696                 ret = sdw_transfer_defer(bus, wr_msg, &bus->defer_msg);
 697         else
 698                 ret = sdw_transfer(bus, wr_msg);
 699
 700         if (ret < 0) {
 701                 dev_err(bus->dev, "Slave frame_ctrl reg write failed\n");
 702                 goto error;
 703         }
 704
 705         if (!multi_link) {
 706                 kfree(wr_msg);
 707                 kfree(wbuf);
 708                 bus->defer_msg.msg = NULL;
 709                 bus->params.curr_bank = !bus->params.curr_bank;
 710                 bus->params.next_bank = !bus->params.next_bank;
 711         }
 712
 713         return 0;
 714
 715 error:
 716         kfree(wbuf);
 717 error_1:
 718         kfree(wr_msg);
 719         bus->defer_msg.msg = NULL;
 720         return ret;
 721 }
 722
 723 /**
 724  * sdw_ml_sync_bank_switch: Multilink register bank switch
 725  *
 726  * @bus: SDW bus instance
 727  * @multi_link: whether this is a multi-link stream with hardware-based sync
 728  *
 729  * Caller function should free the buffers on error
 730  */
 731 static int sdw_ml_sync_bank_switch(struct sdw_bus *bus, bool multi_link)
 732 {
 733         unsigned long time_left;
 734
 735         if (!multi_link)
 736                 return 0;
 737
 738         /* Wait for completion of transfer */
 739         time_left = wait_for_completion_timeout(&bus->defer_msg.complete,
 740                                                 bus->bank_switch_timeout);
 741
 742         if (!time_left) {
 743                 dev_err(bus->dev, "Controller Timed out on bank switch\n");
 744                 return -ETIMEDOUT;
 745         }
 746
 747         bus->params.curr_bank = !bus->params.curr_bank;
 748         bus->params.next_bank = !bus->params.next_bank;
 749
 750         if (bus->defer_msg.msg) {
 751                 kfree(bus->defer_msg.msg->buf);
 752                 kfree(bus->defer_msg.msg);
 753         }
 754
 755         return 0;
 756 }
 757
 758 static int do_bank_switch(struct sdw_stream_runtime *stream)
 759 {
 760         struct sdw_master_runtime *m_rt;
 761         const struct sdw_master_ops *ops;
 762         struct sdw_bus *bus;
 763         bool multi_link = false;
 764         int m_rt_count;
 765         int ret = 0;
 766
 767         m_rt_count = stream->m_rt_count;
 768
 769         list_for_each_entry(m_rt, &stream->master_list, stream_node) {
 770                 bus = m_rt->bus;
 771                 ops = bus->ops;
 772
 773                 if (bus->multi_link && m_rt_count >= bus->hw_sync_min_links) {
 774                         multi_link = true;
 775                         mutex_lock(&bus->msg_lock);
 776                 }
 777
 778                 /* Pre-bank switch */
 779                 if (ops->pre_bank_switch) {
 780                         ret = ops->pre_bank_switch(bus);
 781                         if (ret < 0) {
 782                                 dev_err(bus->dev,
 783                                         "Pre bank switch op failed: %d\n", ret);
 784                                 goto msg_unlock;
 785                         }
 786                 }
 787
 788                 /*
 789                  * Perform Bank switch operation.
 790                  * For multi link cases, the actual bank switch is
 791                  * synchronized across all Masters and happens later as a
 792                  * part of post_bank_switch ops.
 793                  */
 794                 ret = sdw_bank_switch(bus, m_rt_count);
 795                 if (ret < 0) {
 796                         dev_err(bus->dev, "Bank switch failed: %d\n", ret);
 797                         goto error;
 798                 }
 799         }
 800
 801         /*
 802          * For multi link cases, it is expected that the bank switch is
 803          * triggered by the post_bank_switch for the first Master in the list
 804          * and for the other Masters the post_bank_switch() should return doing
 805          * nothing.
 806          */
 807         list_for_each_entry(m_rt, &stream->master_list, stream_node) {
 808                 bus = m_rt->bus;
 809                 ops = bus->ops;
 810
 811                 /* Post-bank switch */
 812                 if (ops->post_bank_switch) {
 813                         ret = ops->post_bank_switch(bus);
 814                         if (ret < 0) {
 815                                 dev_err(bus->dev,
 816                                         "Post bank switch op failed: %d\n",
 817                                         ret);
 818                                 goto error;
 819                         }
 820                 } else if (multi_link) {
 821                         dev_err(bus->dev,
 822                                 "Post bank switch ops not implemented\n");
 823                         goto error;
 824                 }
 825
 826                 /* Set the bank switch timeout to default, if not set */
 827                 if (!bus->bank_switch_timeout)
 828                         bus->bank_switch_timeout = DEFAULT_BANK_SWITCH_TIMEOUT;
 829
 830                 /* Check if bank switch was successful */
 831                 ret = sdw_ml_sync_bank_switch(bus, multi_link);
 832                 if (ret < 0) {
 833                         dev_err(bus->dev,
 834                                 "multi link bank switch failed: %d\n", ret);
 835                         goto error;
 836                 }
 837
 838                 if (multi_link)
 839                         mutex_unlock(&bus->msg_lock);
 840         }
 841
 842         return ret;
 843
 844 error:
 845         list_for_each_entry(m_rt, &stream->master_list, stream_node) {
 846                 bus = m_rt->bus;
 847                 if (bus->defer_msg.msg) {
 848                         kfree(bus->defer_msg.msg->buf);
 849                         kfree(bus->defer_msg.msg);
 850                 }
 851         }
 852
 853 msg_unlock:
 854
 855         if (multi_link) {
 856                 list_for_each_entry(m_rt, &stream->master_list, stream_node) {
 857                         bus = m_rt->bus;
 858                         if (mutex_is_locked(&bus->msg_lock))
 859                                 mutex_unlock(&bus->msg_lock);
 860                 }
 861         }
 862
 863         return ret;
 864 }
 865
 866 /**
 867  * sdw_release_stream() - Free the assigned stream runtime
 868  *
 869  * @stream: SoundWire stream runtime
 870  *
 871  * sdw_release_stream should be called only once per stream
 872  */
 873 void sdw_release_stream(struct sdw_stream_runtime *stream)
 874 {
 875         kfree(stream);
 876 }
 877 EXPORT_SYMBOL(sdw_release_stream);
 878
 879 /**
 880  * sdw_alloc_stream() - Allocate and return stream runtime
 881  *
 882  * @stream_name: SoundWire stream name
 883  *
 884  * Allocates a SoundWire stream runtime instance.
 885  * sdw_alloc_stream should be called only once per stream. Typically
 886  * invoked from ALSA/ASoC machine/platform driver.
 887  */
 888 struct sdw_stream_runtime *sdw_alloc_stream(const char *stream_name)
 889 {
 890         struct sdw_stream_runtime *stream;
 891
 892         stream = kzalloc(sizeof(*stream), GFP_KERNEL);
 893         if (!stream)
 894                 return NULL;
 895
 896         stream->name = stream_name;
 897         INIT_LIST_HEAD(&stream->master_list);
 898         stream->state = SDW_STREAM_ALLOCATED;
 899         stream->m_rt_count = 0;
 900
 901         return stream;
 902 }
 903 EXPORT_SYMBOL(sdw_alloc_stream);
 904
 905 static struct sdw_master_runtime
 906 *sdw_find_master_rt(struct sdw_bus *bus,
 907                     struct sdw_stream_runtime *stream)
 908 {
 909         struct sdw_master_runtime *m_rt;
 910
 911         /* Retrieve Bus handle if already available */
 912         list_for_each_entry(m_rt, &stream->master_list, stream_node) {
 913                 if (m_rt->bus == bus)
 914                         return m_rt;
 915         }
 916
 917         return NULL;
 918 }
 919
 920 /**
 921  * sdw_alloc_master_rt() - Allocates and initialize Master runtime handle
 922  *
 923  * @bus: SDW bus instance
 924  * @stream_config: Stream configuration
 925  * @stream: Stream runtime handle.
 926  *
 927  * This function is to be called with bus_lock held.
 928  */
 929 static struct sdw_master_runtime
 930 *sdw_alloc_master_rt(struct sdw_bus *bus,
 931                      struct sdw_stream_config *stream_config,
 932                      struct sdw_stream_runtime *stream)
 933 {
 934         struct sdw_master_runtime *m_rt;
 935
 936         /*
 937          * check if Master is already allocated (as a result of Slave adding
 938          * it first), if so skip allocation and go to configure
 939          */
 940         m_rt = sdw_find_master_rt(bus, stream);
 941         if (m_rt)
 942                 goto stream_config;
 943
 944         m_rt = kzalloc(sizeof(*m_rt), GFP_KERNEL);
 945         if (!m_rt)
 946                 return NULL;
 947
 948         /* Initialization of Master runtime handle */
 949         INIT_LIST_HEAD(&m_rt->port_list);
 950         INIT_LIST_HEAD(&m_rt->slave_rt_list);
 951         list_add_tail(&m_rt->stream_node, &stream->master_list);
 952
 953         list_add_tail(&m_rt->bus_node, &bus->m_rt_list);
 954
 955 stream_config:
 956         m_rt->ch_count = stream_config->ch_count;
 957         m_rt->bus = bus;
 958         m_rt->stream = stream;
 959         m_rt->direction = stream_config->direction;
 960
 961         return m_rt;
 962 }
 963
 964 /**
 965  * sdw_alloc_slave_rt() - Allocate and initialize Slave runtime handle.
 966  *
 967  * @slave: Slave handle
 968  * @stream_config: Stream configuration
 969  * @stream: Stream runtime handle
 970  *
 971  * This function is to be called with bus_lock held.
 972  */
 973 static struct sdw_slave_runtime
 974 *sdw_alloc_slave_rt(struct sdw_slave *slave,
 975                     struct sdw_stream_config *stream_config,
 976                     struct sdw_stream_runtime *stream)
 977 {
 978         struct sdw_slave_runtime *s_rt;
 979
 980         s_rt = kzalloc(sizeof(*s_rt), GFP_KERNEL);
 981         if (!s_rt)
 982                 return NULL;
 983
 984         INIT_LIST_HEAD(&s_rt->port_list);
 985         s_rt->ch_count = stream_config->ch_count;
 986         s_rt->direction = stream_config->direction;
 987         s_rt->slave = slave;
 988
 989         return s_rt;
 990 }
 991
 992 static void sdw_master_port_release(struct sdw_bus *bus,
 993                                     struct sdw_master_runtime *m_rt)
 994 {
 995         struct sdw_port_runtime *p_rt, *_p_rt;
 996
 997         list_for_each_entry_safe(p_rt, _p_rt, &m_rt->port_list, port_node) {
 998                 list_del(&p_rt->port_node);
 999                 kfree(p_rt);
1000         }
1001 }
1002
1003 static void sdw_slave_port_release(struct sdw_bus *bus,
1004                                    struct sdw_slave *slave,
1005                                    struct sdw_stream_runtime *stream)
1006 {
1007         struct sdw_port_runtime *p_rt, *_p_rt;
1008         struct sdw_master_runtime *m_rt;
1009         struct sdw_slave_runtime *s_rt;
1010
1011         list_for_each_entry(m_rt, &stream->master_list, stream_node) {
1012                 list_for_each_entry(s_rt, &m_rt->slave_rt_list, m_rt_node) {
1013                         if (s_rt->slave != slave)
1014                                 continue;
1015
1016                         list_for_each_entry_safe(p_rt, _p_rt,
1017                                                  &s_rt->port_list, port_node) {
1018                                 list_del(&p_rt->port_node);
1019                                 kfree(p_rt);
1020                         }
1021                 }
1022         }
1023 }
1024
1025 /**
1026  * sdw_release_slave_stream() - Free Slave(s) runtime handle
1027  *
1028  * @slave: Slave handle.
1029  * @stream: Stream runtime handle.
1030  *
1031  * This function is to be called with bus_lock held.
1032  */
1033 static void sdw_release_slave_stream(struct sdw_slave *slave,
1034                                      struct sdw_stream_runtime *stream)
1035 {
1036         struct sdw_slave_runtime *s_rt, *_s_rt;
1037         struct sdw_master_runtime *m_rt;
1038
1039         list_for_each_entry(m_rt, &stream->master_list, stream_node) {
1040                 /* Retrieve Slave runtime handle */
1041                 list_for_each_entry_safe(s_rt, _s_rt,
1042                                          &m_rt->slave_rt_list, m_rt_node) {
1043                         if (s_rt->slave == slave) {
1044                                 list_del(&s_rt->m_rt_node);
1045                                 kfree(s_rt);
1046                                 return;
1047                         }
1048                 }
1049         }
1050 }
1051
1052 /**
1053  * sdw_release_master_stream() - Free Master runtime handle
1054  *
1055  * @m_rt: Master runtime node
1056  * @stream: Stream runtime handle.
1057  *
1058  * This function is to be called with bus_lock held
1059  * It frees the Master runtime handle and associated Slave(s) runtime
1060  * handle. If this is called first then sdw_release_slave_stream() will have
1061  * no effect as Slave(s) runtime handle would already be freed up.
1062  */
1063 static void sdw_release_master_stream(struct sdw_master_runtime *m_rt,
1064                                       struct sdw_stream_runtime *stream)
1065 {
1066         struct sdw_slave_runtime *s_rt, *_s_rt;
1067
1068         list_for_each_entry_safe(s_rt, _s_rt, &m_rt->slave_rt_list, m_rt_node) {
1069                 sdw_slave_port_release(s_rt->slave->bus, s_rt->slave, stream);
1070                 sdw_release_slave_stream(s_rt->slave, stream);
1071         }
1072
1073         list_del(&m_rt->stream_node);
1074         list_del(&m_rt->bus_node);
1075         kfree(m_rt);
1076 }
1077
1078 /**
1079  * sdw_stream_remove_master() - Remove master from sdw_stream
1080  *
1081  * @bus: SDW Bus instance
1082  * @stream: SoundWire stream
1083  *
1084  * This removes and frees port_rt and master_rt from a stream
1085  */
1086 int sdw_stream_remove_master(struct sdw_bus *bus,
1087                              struct sdw_stream_runtime *stream)
1088 {
1089         struct sdw_master_runtime *m_rt, *_m_rt;
1090
1091         mutex_lock(&bus->bus_lock);
1092
1093         list_for_each_entry_safe(m_rt, _m_rt,
1094                                  &stream->master_list, stream_node) {
1095                 if (m_rt->bus != bus)
1096                         continue;
1097
1098                 sdw_master_port_release(bus, m_rt);
1099                 sdw_release_master_stream(m_rt, stream);
1100                 stream->m_rt_count--;
1101         }
1102
1103         if (list_empty(&stream->master_list))
1104                 stream->state = SDW_STREAM_RELEASED;
1105
1106         mutex_unlock(&bus->bus_lock);
1107
1108         return 0;
1109 }
1110 EXPORT_SYMBOL(sdw_stream_remove_master);
1111
1112 /**
1113  * sdw_stream_remove_slave() - Remove slave from sdw_stream
1114  *
1115  * @slave: SDW Slave instance
1116  * @stream: SoundWire stream
1117  *
1118  * This removes and frees port_rt and slave_rt from a stream
1119  */
1120 int sdw_stream_remove_slave(struct sdw_slave *slave,
1121                             struct sdw_stream_runtime *stream)
1122 {
1123         mutex_lock(&slave->bus->bus_lock);
1124
1125         sdw_slave_port_release(slave->bus, slave, stream);
1126         sdw_release_slave_stream(slave, stream);
1127
1128         mutex_unlock(&slave->bus->bus_lock);
1129
1130         return 0;
1131 }
1132 EXPORT_SYMBOL(sdw_stream_remove_slave);
1133
1134 /**
1135  * sdw_config_stream() - Configure the allocated stream
1136  *
1137  * @dev: SDW device
1138  * @stream: SoundWire stream
1139  * @stream_config: Stream configuration for audio stream
1140  * @is_slave: is API called from Slave or Master
1141  *
1142  * This function is to be called with bus_lock held.
1143  */
1144 static int sdw_config_stream(struct device *dev,
1145                              struct sdw_stream_runtime *stream,
1146                              struct sdw_stream_config *stream_config,
1147                              bool is_slave)
1148 {
1149         /*
1150          * Update the stream rate, channel and bps based on data
1151          * source. For more than one data source (multilink),
1152          * match the rate, bps, stream type and increment number of channels.
1153          *
1154          * If rate/bps is zero, it means the values are not set, so skip
1155          * comparison and allow the value to be set and stored in stream
1156          */
1157         if (stream->params.rate &&
1158             stream->params.rate != stream_config->frame_rate) {
1159                 dev_err(dev, "rate not matching, stream:%s\n", stream->name);
1160                 return -EINVAL;
1161         }
1162
1163         if (stream->params.bps &&
1164             stream->params.bps != stream_config->bps) {
1165                 dev_err(dev, "bps not matching, stream:%s\n", stream->name);
1166                 return -EINVAL;
1167         }
1168
1169         stream->type = stream_config->type;
1170         stream->params.rate = stream_config->frame_rate;
1171         stream->params.bps = stream_config->bps;
1172
1173         /* TODO: Update this check during Device-device support */
1174         if (is_slave)
1175                 stream->params.ch_count += stream_config->ch_count;
1176
1177         return 0;
1178 }
1179
1180 static int sdw_is_valid_port_range(struct device *dev,
1181                                    struct sdw_port_runtime *p_rt)
1182 {
1183         if (!SDW_VALID_PORT_RANGE(p_rt->num)) {
1184                 dev_err(dev,
1185                         "SoundWire: Invalid port number :%d\n", p_rt->num);
1186                 return -EINVAL;
1187         }
1188
1189         return 0;
1190 }
1191
1192 static struct sdw_port_runtime
1193 *sdw_port_alloc(struct device *dev,
1194                 struct sdw_port_config *port_config,
1195                 int port_index)
1196 {
1197         struct sdw_port_runtime *p_rt;
1198
1199         p_rt = kzalloc(sizeof(*p_rt), GFP_KERNEL);
1200         if (!p_rt)
1201                 return NULL;
1202
1203         p_rt->ch_mask = port_config[port_index].ch_mask;
1204         p_rt->num = port_config[port_index].num;
1205
1206         return p_rt;
1207 }
1208
1209 static int sdw_master_port_config(struct sdw_bus *bus,
1210                                   struct sdw_master_runtime *m_rt,
1211                                   struct sdw_port_config *port_config,
1212                                   unsigned int num_ports)
1213 {
1214         struct sdw_port_runtime *p_rt;
1215         int i;
1216
1217         /* Iterate for number of ports to perform initialization */
1218         for (i = 0; i < num_ports; i++) {
1219                 p_rt = sdw_port_alloc(bus->dev, port_config, i);
1220                 if (!p_rt)
1221                         return -ENOMEM;
1222
1223                 /*
1224                  * TODO: Check port capabilities for requested
1225                  * configuration (audio mode support)
1226                  */
1227
1228                 list_add_tail(&p_rt->port_node, &m_rt->port_list);
1229         }
1230
1231         return 0;
1232 }
1233
1234 static int sdw_slave_port_config(struct sdw_slave *slave,
1235                                  struct sdw_slave_runtime *s_rt,
1236                                  struct sdw_port_config *port_config,
1237                                  unsigned int num_config)
1238 {
1239         struct sdw_port_runtime *p_rt;
1240         int i, ret;
1241
1242         /* Iterate for number of ports to perform initialization */
1243         for (i = 0; i < num_config; i++) {
1244                 p_rt = sdw_port_alloc(&slave->dev, port_config, i);
1245                 if (!p_rt)
1246                         return -ENOMEM;
1247
1248                 /*
1249                  * TODO: Check valid port range as defined by DisCo/
1250                  * slave
1251                  */
1252                 ret = sdw_is_valid_port_range(&slave->dev, p_rt);
1253                 if (ret < 0) {
1254                         kfree(p_rt);
1255                         return ret;
1256                 }
1257
1258                 /*
1259                  * TODO: Check port capabilities for requested
1260                  * configuration (audio mode support)
1261                  */
1262
1263                 list_add_tail(&p_rt->port_node, &s_rt->port_list);
1264         }
1265
1266         return 0;
1267 }
1268
1269 /**
1270  * sdw_stream_add_master() - Allocate and add master runtime to a stream
1271  *
1272  * @bus: SDW Bus instance
1273  * @stream_config: Stream configuration for audio stream
1274  * @port_config: Port configuration for audio stream
1275  * @num_ports: Number of ports
1276  * @stream: SoundWire stream
1277  */
1278 int sdw_stream_add_master(struct sdw_bus *bus,
1279                           struct sdw_stream_config *stream_config,
1280                           struct sdw_port_config *port_config,
1281                           unsigned int num_ports,
1282                           struct sdw_stream_runtime *stream)
1283 {
1284         struct sdw_master_runtime *m_rt;
1285         int ret;
1286
1287         mutex_lock(&bus->bus_lock);
1288
1289         /*
1290          * For multi link streams, add the second master only if
1291          * the bus supports it.
1292          * Check if bus->multi_link is set
1293          */
1294         if (!bus->multi_link && stream->m_rt_count > 0) {
1295                 dev_err(bus->dev,
1296                         "Multilink not supported, link %d\n", bus->link_id);
1297                 ret = -EINVAL;
1298                 goto unlock;
1299         }
1300
1301         m_rt = sdw_alloc_master_rt(bus, stream_config, stream);
1302         if (!m_rt) {
1303                 dev_err(bus->dev,
1304                         "Master runtime config failed for stream:%s\n",
1305                         stream->name);
1306                 ret = -ENOMEM;
1307                 goto unlock;
1308         }
1309
1310         ret = sdw_config_stream(bus->dev, stream, stream_config, false);
1311         if (ret)
1312                 goto stream_error;
1313
1314         ret = sdw_master_port_config(bus, m_rt, port_config, num_ports);
1315         if (ret)
1316                 goto stream_error;
1317
1318         stream->m_rt_count++;
1319
1320         goto unlock;
1321
1322 stream_error:
1323         sdw_release_master_stream(m_rt, stream);
1324 unlock:
1325         mutex_unlock(&bus->bus_lock);
1326         return ret;
1327 }
1328 EXPORT_SYMBOL(sdw_stream_add_master);
1329
1330 /**
1331  * sdw_stream_add_slave() - Allocate and add master/slave runtime to a stream
1332  *
1333  * @slave: SDW Slave instance
1334  * @stream_config: Stream configuration for audio stream
1335  * @stream: SoundWire stream
1336  * @port_config: Port configuration for audio stream
1337  * @num_ports: Number of ports
1338  *
1339  * It is expected that Slave is added before adding Master
1340  * to the Stream.
1341  *
1342  */
1343 int sdw_stream_add_slave(struct sdw_slave *slave,
1344                          struct sdw_stream_config *stream_config,
1345                          struct sdw_port_config *port_config,
1346                          unsigned int num_ports,
1347                          struct sdw_stream_runtime *stream)
1348 {
1349         struct sdw_slave_runtime *s_rt;
1350         struct sdw_master_runtime *m_rt;
1351         int ret;
1352
1353         mutex_lock(&slave->bus->bus_lock);
1354
1355         /*
1356          * If this API is invoked by Slave first then m_rt is not valid.
1357          * So, allocate m_rt and add Slave to it.
1358          */
1359         m_rt = sdw_alloc_master_rt(slave->bus, stream_config, stream);
1360         if (!m_rt) {
1361                 dev_err(&slave->dev,
1362                         "alloc master runtime failed for stream:%s\n",
1363                         stream->name);
1364                 ret = -ENOMEM;
1365                 goto error;
1366         }
1367
1368         s_rt = sdw_alloc_slave_rt(slave, stream_config, stream);
1369         if (!s_rt) {
1370                 dev_err(&slave->dev,
1371                         "Slave runtime config failed for stream:%s\n",
1372                         stream->name);
1373                 ret = -ENOMEM;
1374                 goto stream_error;
1375         }
1376
1377         ret = sdw_config_stream(&slave->dev, stream, stream_config, true);
1378         if (ret) {
1379                 /*
1380                  * sdw_release_master_stream will release s_rt in slave_rt_list in
1381                  * stream_error case, but s_rt is only added to slave_rt_list
1382                  * when sdw_config_stream is successful, so free s_rt explicitly
1383                  * when sdw_config_stream is failed.
1384                  */
1385                 kfree(s_rt);
1386                 goto stream_error;
1387         }
1388
1389         list_add_tail(&s_rt->m_rt_node, &m_rt->slave_rt_list);
1390
1391         ret = sdw_slave_port_config(slave, s_rt, port_config, num_ports);
1392         if (ret)
1393                 goto stream_error;
1394
1395         /*
1396          * Change stream state to CONFIGURED on first Slave add.
1397          * Bus is not aware of number of Slave(s) in a stream at this
1398          * point so cannot depend on all Slave(s) to be added in order to
1399          * change stream state to CONFIGURED.
1400          */
1401         stream->state = SDW_STREAM_CONFIGURED;
1402         goto error;
1403
1404 stream_error:
1405         /*
1406          * we hit error so cleanup the stream, release all Slave(s) and
1407          * Master runtime
1408          */
1409         sdw_release_master_stream(m_rt, stream);
1410 error:
1411         mutex_unlock(&slave->bus->bus_lock);
1412         return ret;
1413 }
1414 EXPORT_SYMBOL(sdw_stream_add_slave);
1415
1416 /**
1417  * sdw_get_slave_dpn_prop() - Get Slave port capabilities
1418  *
1419  * @slave: Slave handle
1420  * @direction: Data direction.
1421  * @port_num: Port number
1422  */
1423 struct sdw_dpn_prop *sdw_get_slave_dpn_prop(struct sdw_slave *slave,
1424                                             enum sdw_data_direction direction,
1425                                             unsigned int port_num)
1426 {
1427         struct sdw_dpn_prop *dpn_prop;
1428         u8 num_ports;
1429         int i;
1430
1431         if (direction == SDW_DATA_DIR_TX) {
1432                 num_ports = hweight32(slave->prop.source_ports);
1433                 dpn_prop = slave->prop.src_dpn_prop;
1434         } else {
1435                 num_ports = hweight32(slave->prop.sink_ports);
1436                 dpn_prop = slave->prop.sink_dpn_prop;
1437         }
1438
1439         for (i = 0; i < num_ports; i++) {
1440                 if (dpn_prop[i].num == port_num)
1441                         return &dpn_prop[i];
1442         }
1443
1444         return NULL;
1445 }
1446
1447 /**
1448  * sdw_acquire_bus_lock: Acquire bus lock for all Master runtime(s)
1449  *
1450  * @stream: SoundWire stream
1451  *
1452  * Acquire bus_lock for each of the master runtime(m_rt) part of this
1453  * stream to reconfigure the bus.
1454  * NOTE: This function is called from SoundWire stream ops and is
1455  * expected that a global lock is held before acquiring bus_lock.
1456  */
1457 static void sdw_acquire_bus_lock(struct sdw_stream_runtime *stream)
1458 {
1459         struct sdw_master_runtime *m_rt;
1460         struct sdw_bus *bus = NULL;
1461
1462         /* Iterate for all Master(s) in Master list */
1463         list_for_each_entry(m_rt, &stream->master_list, stream_node) {
1464                 bus = m_rt->bus;
1465
1466                 mutex_lock(&bus->bus_lock);
1467         }
1468 }
1469
1470 /**
1471  * sdw_release_bus_lock: Release bus lock for all Master runtime(s)
1472  *
1473  * @stream: SoundWire stream
1474  *
1475  * Release the previously held bus_lock after reconfiguring the bus.
1476  * NOTE: This function is called from SoundWire stream ops and is
1477  * expected that a global lock is held before releasing bus_lock.
1478  */
1479 static void sdw_release_bus_lock(struct sdw_stream_runtime *stream)
1480 {
1481         struct sdw_master_runtime *m_rt = NULL;
1482         struct sdw_bus *bus = NULL;
1483
1484         /* Iterate for all Master(s) in Master list */
1485         list_for_each_entry_reverse(m_rt, &stream->master_list, stream_node) {
1486                 bus = m_rt->bus;
1487                 mutex_unlock(&bus->bus_lock);
1488         }
1489 }
1490
1491 static int _sdw_prepare_stream(struct sdw_stream_runtime *stream,
1492                                bool update_params)
1493 {
1494         struct sdw_master_runtime *m_rt;
1495         struct sdw_bus *bus = NULL;
1496         struct sdw_master_prop *prop;
1497         struct sdw_bus_params params;
1498         int ret;
1499
1500         /* Prepare  Master(s) and Slave(s) port(s) associated with stream */
1501         list_for_each_entry(m_rt, &stream->master_list, stream_node) {
1502                 bus = m_rt->bus;
1503                 prop = &bus->prop;
1504                 memcpy(&params, &bus->params, sizeof(params));
1505
1506                 /* TODO: Support Asynchronous mode */
1507                 if ((prop->max_clk_freq % stream->params.rate) != 0) {
1508                         dev_err(bus->dev, "Async mode not supported\n");
1509                         return -EINVAL;
1510                 }
1511
1512                 if (!update_params)
1513                         goto program_params;
1514
1515                 /* Increment cumulative bus bandwidth */
1516                 /* TODO: Update this during Device-Device support */
1517                 bus->params.bandwidth += m_rt->stream->params.rate *
1518                         m_rt->ch_count * m_rt->stream->params.bps;
1519
1520                 /* Compute params */
1521                 if (bus->compute_params) {
1522                         ret = bus->compute_params(bus);
1523                         if (ret < 0) {
1524                                 dev_err(bus->dev, "Compute params failed: %d",
1525                                         ret);
1526                                 return ret;
1527                         }
1528                 }
1529
1530 program_params:
1531                 /* Program params */
1532                 ret = sdw_program_params(bus, true);
1533                 if (ret < 0) {
1534                         dev_err(bus->dev, "Program params failed: %d\n", ret);
1535                         goto restore_params;
1536                 }
1537         }
1538
1539         if (!bus) {
1540                 pr_err("Configuration error in %s\n", __func__);
1541                 return -EINVAL;
1542         }
1543
1544         ret = do_bank_switch(stream);
1545         if (ret < 0) {
1546                 dev_err(bus->dev, "Bank switch failed: %d\n", ret);
1547                 goto restore_params;
1548         }
1549
1550         list_for_each_entry(m_rt, &stream->master_list, stream_node) {
1551                 bus = m_rt->bus;
1552
1553                 /* Prepare port(s) on the new clock configuration */
1554                 ret = sdw_prep_deprep_ports(m_rt, true);
1555                 if (ret < 0) {
1556                         dev_err(bus->dev, "Prepare port(s) failed ret = %d\n",
1557                                 ret);
1558                         return ret;
1559                 }
1560         }
1561
1562         stream->state = SDW_STREAM_PREPARED;
1563
1564         return ret;
1565
1566 restore_params:
1567         memcpy(&bus->params, &params, sizeof(params));
1568         return ret;
1569 }
1570
1571 /**
1572  * sdw_prepare_stream() - Prepare SoundWire stream
1573  *
1574  * @stream: Soundwire stream
1575  *
1576  * Documentation/driver-api/soundwire/stream.rst explains this API in detail
1577  */
1578 int sdw_prepare_stream(struct sdw_stream_runtime *stream)
1579 {
1580         bool update_params = true;
1581         int ret;
1582
1583         if (!stream) {
1584                 pr_err("SoundWire: Handle not found for stream\n");
1585                 return -EINVAL;
1586         }
1587
1588         sdw_acquire_bus_lock(stream);
1589
1590         if (stream->state == SDW_STREAM_PREPARED) {
1591                 ret = 0;
1592                 goto state_err;
1593         }
1594
1595         if (stream->state != SDW_STREAM_CONFIGURED &&
1596             stream->state != SDW_STREAM_DEPREPARED &&
1597             stream->state != SDW_STREAM_DISABLED) {
1598                 pr_err("%s: %s: inconsistent state state %d\n",
1599                        __func__, stream->name, stream->state);
1600                 ret = -EINVAL;
1601                 goto state_err;
1602         }
1603
1604         /*
1605          * when the stream is DISABLED, this means sdw_prepare_stream()
1606          * is called as a result of an underflow or a resume operation.
1607          * In this case, the bus parameters shall not be recomputed, but
1608          * still need to be re-applied
1609          */
1610         if (stream->state == SDW_STREAM_DISABLED)
1611                 update_params = false;
1612
1613         ret = _sdw_prepare_stream(stream, update_params);
1614
1615 state_err:
1616         sdw_release_bus_lock(stream);
1617         return ret;
1618 }
1619 EXPORT_SYMBOL(sdw_prepare_stream);
1620
1621 static int _sdw_enable_stream(struct sdw_stream_runtime *stream)
1622 {
1623         struct sdw_master_runtime *m_rt;
1624         struct sdw_bus *bus = NULL;
1625         int ret;
1626
1627         /* Enable Master(s) and Slave(s) port(s) associated with stream */
1628         list_for_each_entry(m_rt, &stream->master_list, stream_node) {
1629                 bus = m_rt->bus;
1630
1631                 /* Program params */
1632                 ret = sdw_program_params(bus, false);
1633                 if (ret < 0) {
1634                         dev_err(bus->dev, "Program params failed: %d\n", ret);
1635                         return ret;
1636                 }
1637
1638                 /* Enable port(s) */
1639                 ret = sdw_enable_disable_ports(m_rt, true);
1640                 if (ret < 0) {
1641                         dev_err(bus->dev,
1642                                 "Enable port(s) failed ret: %d\n", ret);
1643                         return ret;
1644                 }
1645         }
1646
1647         if (!bus) {
1648                 pr_err("Configuration error in %s\n", __func__);
1649                 return -EINVAL;
1650         }
1651
1652         ret = do_bank_switch(stream);
1653         if (ret < 0) {
1654                 dev_err(bus->dev, "Bank switch failed: %d\n", ret);
1655                 return ret;
1656         }
1657
1658         stream->state = SDW_STREAM_ENABLED;
1659         return 0;
1660 }
1661
1662 /**
1663  * sdw_enable_stream() - Enable SoundWire stream
1664  *
1665  * @stream: Soundwire stream
1666  *
1667  * Documentation/driver-api/soundwire/stream.rst explains this API in detail
1668  */
1669 int sdw_enable_stream(struct sdw_stream_runtime *stream)
1670 {
1671         int ret;
1672
1673         if (!stream) {
1674                 pr_err("SoundWire: Handle not found for stream\n");
1675                 return -EINVAL;
1676         }
1677
1678         sdw_acquire_bus_lock(stream);
1679
1680         if (stream->state != SDW_STREAM_PREPARED &&
1681             stream->state != SDW_STREAM_DISABLED) {
1682                 pr_err("%s: %s: inconsistent state state %d\n",
1683                        __func__, stream->name, stream->state);
1684                 ret = -EINVAL;
1685                 goto state_err;
1686         }
1687
1688         ret = _sdw_enable_stream(stream);
1689
1690 state_err:
1691         sdw_release_bus_lock(stream);
1692         return ret;
1693 }
1694 EXPORT_SYMBOL(sdw_enable_stream);
1695
1696 static int _sdw_disable_stream(struct sdw_stream_runtime *stream)
1697 {
1698         struct sdw_master_runtime *m_rt;
1699         int ret;
1700
1701         list_for_each_entry(m_rt, &stream->master_list, stream_node) {
1702                 struct sdw_bus *bus = m_rt->bus;
1703
1704                 /* Disable port(s) */
1705                 ret = sdw_enable_disable_ports(m_rt, false);
1706                 if (ret < 0) {
1707                         dev_err(bus->dev, "Disable port(s) failed: %d\n", ret);
1708                         return ret;
1709                 }
1710         }
1711         stream->state = SDW_STREAM_DISABLED;
1712
1713         list_for_each_entry(m_rt, &stream->master_list, stream_node) {
1714                 struct sdw_bus *bus = m_rt->bus;
1715
1716                 /* Program params */
1717                 ret = sdw_program_params(bus, false);
1718                 if (ret < 0) {
1719                         dev_err(bus->dev, "Program params failed: %d\n", ret);
1720                         return ret;
1721                 }
1722         }
1723
1724         ret = do_bank_switch(stream);
1725         if (ret < 0) {
1726                 pr_err("Bank switch failed: %d\n", ret);
1727                 return ret;
1728         }
1729
1730         /* make sure alternate bank (previous current) is also disabled */
1731         list_for_each_entry(m_rt, &stream->master_list, stream_node) {
1732                 struct sdw_bus *bus = m_rt->bus;
1733
1734                 /* Disable port(s) */
1735                 ret = sdw_enable_disable_ports(m_rt, false);
1736                 if (ret < 0) {
1737                         dev_err(bus->dev, "Disable port(s) failed: %d\n", ret);
1738                         return ret;
1739                 }
1740         }
1741
1742         return 0;
1743 }
1744
1745 /**
1746  * sdw_disable_stream() - Disable SoundWire stream
1747  *
1748  * @stream: Soundwire stream
1749  *
1750  * Documentation/driver-api/soundwire/stream.rst explains this API in detail
1751  */
1752 int sdw_disable_stream(struct sdw_stream_runtime *stream)
1753 {
1754         int ret;
1755
1756         if (!stream) {
1757                 pr_err("SoundWire: Handle not found for stream\n");
1758                 return -EINVAL;
1759         }
1760
1761         sdw_acquire_bus_lock(stream);
1762
1763         if (stream->state != SDW_STREAM_ENABLED) {
1764                 pr_err("%s: %s: inconsistent state state %d\n",
1765                        __func__, stream->name, stream->state);
1766                 ret = -EINVAL;
1767                 goto state_err;
1768         }
1769
1770         ret = _sdw_disable_stream(stream);
1771
1772 state_err:
1773         sdw_release_bus_lock(stream);
1774         return ret;
1775 }
1776 EXPORT_SYMBOL(sdw_disable_stream);
1777
1778 static int _sdw_deprepare_stream(struct sdw_stream_runtime *stream)
1779 {
1780         struct sdw_master_runtime *m_rt;
1781         struct sdw_bus *bus;
1782         int ret = 0;
1783
1784         list_for_each_entry(m_rt, &stream->master_list, stream_node) {
1785                 bus = m_rt->bus;
1786                 /* De-prepare port(s) */
1787                 ret = sdw_prep_deprep_ports(m_rt, false);
1788                 if (ret < 0) {
1789                         dev_err(bus->dev,
1790                                 "De-prepare port(s) failed: %d\n", ret);
1791                         return ret;
1792                 }
1793
1794                 /* TODO: Update this during Device-Device support */
1795                 bus->params.bandwidth -= m_rt->stream->params.rate *
1796                         m_rt->ch_count * m_rt->stream->params.bps;
1797
1798                 /* Compute params */
1799                 if (bus->compute_params) {
1800                         ret = bus->compute_params(bus);
1801                         if (ret < 0) {
1802                                 dev_err(bus->dev, "Compute params failed: %d",
1803                                         ret);
1804                                 return ret;
1805                         }
1806                 }
1807
1808                 /* Program params */
1809                 ret = sdw_program_params(bus, false);
1810                 if (ret < 0) {
1811                         dev_err(bus->dev, "Program params failed: %d\n", ret);
1812                         return ret;
1813                 }
1814         }
1815
1816         stream->state = SDW_STREAM_DEPREPARED;
1817         return do_bank_switch(stream);
1818 }
1819
1820 /**
1821  * sdw_deprepare_stream() - Deprepare SoundWire stream
1822  *
1823  * @stream: Soundwire stream
1824  *
1825  * Documentation/driver-api/soundwire/stream.rst explains this API in detail
1826  */
1827 int sdw_deprepare_stream(struct sdw_stream_runtime *stream)
1828 {
1829         int ret;
1830
1831         if (!stream) {
1832                 pr_err("SoundWire: Handle not found for stream\n");
1833                 return -EINVAL;
1834         }
1835
1836         sdw_acquire_bus_lock(stream);
1837
1838         if (stream->state != SDW_STREAM_PREPARED &&
1839             stream->state != SDW_STREAM_DISABLED) {
1840                 pr_err("%s: %s: inconsistent state state %d\n",
1841                        __func__, stream->name, stream->state);
1842                 ret = -EINVAL;
1843                 goto state_err;
1844         }
1845
1846         ret = _sdw_deprepare_stream(stream);
1847
1848 state_err:
1849         sdw_release_bus_lock(stream);
1850         return ret;
1851 }
1852 EXPORT_SYMBOL(sdw_deprepare_stream);
1853
1854 static int set_stream(struct snd_pcm_substream *substream,
1855                       struct sdw_stream_runtime *sdw_stream)
1856 {
1857         struct snd_soc_pcm_runtime *rtd = substream->private_data;
1858         struct snd_soc_dai *dai;
1859         int ret = 0;
1860         int i;
1861
1862         /* Set stream pointer on all DAIs */
1863         for_each_rtd_dais(rtd, i, dai) {
1864                 ret = snd_soc_dai_set_stream(dai, sdw_stream, substream->stream);
1865                 if (ret < 0) {
1866                         dev_err(rtd->dev, "failed to set stream pointer on dai %s", dai->name);
1867                         break;
1868                 }
1869         }
1870
1871         return ret;
1872 }
1873
1874 /**
1875  * sdw_startup_stream() - Startup SoundWire stream
1876  *
1877  * @sdw_substream: Soundwire stream
1878  *
1879  * Documentation/driver-api/soundwire/stream.rst explains this API in detail
1880  */
1881 int sdw_startup_stream(void *sdw_substream)
1882 {
1883         struct snd_pcm_substream *substream = sdw_substream;
1884         struct snd_soc_pcm_runtime *rtd = substream->private_data;
1885         struct sdw_stream_runtime *sdw_stream;
1886         char *name;
1887         int ret;
1888
1889         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
1890                 name = kasprintf(GFP_KERNEL, "%s-Playback", substream->name);
1891         else
1892                 name = kasprintf(GFP_KERNEL, "%s-Capture", substream->name);
1893
1894         if (!name)
1895                 return -ENOMEM;
1896
1897         sdw_stream = sdw_alloc_stream(name);
1898         if (!sdw_stream) {
1899                 dev_err(rtd->dev, "alloc stream failed for substream DAI %s", substream->name);
1900                 ret = -ENOMEM;
1901                 goto error;
1902         }
1903
1904         ret = set_stream(substream, sdw_stream);
1905         if (ret < 0)
1906                 goto release_stream;
1907         return 0;
1908
1909 release_stream:
1910         sdw_release_stream(sdw_stream);
1911         set_stream(substream, NULL);
1912 error:
1913         kfree(name);
1914         return ret;
1915 }
1916 EXPORT_SYMBOL(sdw_startup_stream);
1917
1918 /**
1919  * sdw_shutdown_stream() - Shutdown SoundWire stream
1920  *
1921  * @sdw_substream: Soundwire stream
1922  *
1923  * Documentation/driver-api/soundwire/stream.rst explains this API in detail
1924  */
1925 void sdw_shutdown_stream(void *sdw_substream)
1926 {
1927         struct snd_pcm_substream *substream = sdw_substream;
1928         struct snd_soc_pcm_runtime *rtd = substream->private_data;
1929         struct sdw_stream_runtime *sdw_stream;
1930         struct snd_soc_dai *dai;
1931
1932         /* Find stream from first CPU DAI */
1933         dai = asoc_rtd_to_cpu(rtd, 0);
1934
1935         sdw_stream = snd_soc_dai_get_stream(dai, substream->stream);
1936
1937         if (IS_ERR(sdw_stream)) {
1938                 dev_err(rtd->dev, "no stream found for DAI %s", dai->name);
1939                 return;
1940         }
1941
1942         /* release memory */
1943         kfree(sdw_stream->name);
1944         sdw_release_stream(sdw_stream);
1945
1946         /* clear DAI data */
1947         set_stream(substream, NULL);
1948 }
1949 EXPORT_SYMBOL(sdw_shutdown_stream);