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 "bus.h"
  17
  18 /*
  19  * Array of supported rows and columns as per MIPI SoundWire Specification 1.1
  20  *
  21  * The rows are arranged as per the array index value programmed
  22  * in register. The index 15 has dummy value 0 in order to fill hole.
  23  */
  24 int sdw_rows[SDW_FRAME_ROWS] = {48, 50, 60, 64, 75, 80, 125, 147,
  25                         96, 100, 120, 128, 150, 160, 250, 0,
  26                         192, 200, 240, 256, 72, 144, 90, 180};
  27
  28 int sdw_cols[SDW_FRAME_COLS] = {2, 4, 6, 8, 10, 12, 14, 16};
  29
  30 int sdw_find_col_index(int col)
  31 {
  32         int i;
  33
  34         for (i = 0; i < SDW_FRAME_COLS; i++) {
  35                 if (sdw_cols[i] == col)
  36                         return i;
  37         }
  38
  39         pr_warn("Requested column not found, selecting lowest column no: 2\n");
  40         return 0;
  41 }
  42 EXPORT_SYMBOL(sdw_find_col_index);
  43
  44 int sdw_find_row_index(int row)
  45 {
  46         int i;
  47
  48         for (i = 0; i < SDW_FRAME_ROWS; i++) {
  49                 if (sdw_rows[i] == row)
  50                         return i;
  51         }
  52
  53         pr_warn("Requested row not found, selecting lowest row no: 48\n");
  54         return 0;
  55 }
  56 EXPORT_SYMBOL(sdw_find_row_index);
  57
  58 static int _sdw_program_slave_port_params(struct sdw_bus *bus,
  59                                           struct sdw_slave *slave,
  60                                           struct sdw_transport_params *t_params,
  61                                           enum sdw_dpn_type type)
  62 {
  63         u32 addr1, addr2, addr3, addr4;
  64         int ret;
  65         u16 wbuf;
  66
  67         if (bus->params.next_bank) {
  68                 addr1 = SDW_DPN_OFFSETCTRL2_B1(t_params->port_num);
  69                 addr2 = SDW_DPN_BLOCKCTRL3_B1(t_params->port_num);
  70                 addr3 = SDW_DPN_SAMPLECTRL2_B1(t_params->port_num);
  71                 addr4 = SDW_DPN_HCTRL_B1(t_params->port_num);
  72         } else {
  73                 addr1 = SDW_DPN_OFFSETCTRL2_B0(t_params->port_num);
  74                 addr2 = SDW_DPN_BLOCKCTRL3_B0(t_params->port_num);
  75                 addr3 = SDW_DPN_SAMPLECTRL2_B0(t_params->port_num);
  76                 addr4 = SDW_DPN_HCTRL_B0(t_params->port_num);
  77         }
  78
  79         /* Program DPN_OffsetCtrl2 registers */
  80         ret = sdw_write(slave, addr1, t_params->offset2);
  81         if (ret < 0) {
  82                 dev_err(bus->dev, "DPN_OffsetCtrl2 register write failed\n");
  83                 return ret;
  84         }
  85
  86         /* Program DPN_BlockCtrl3 register */
  87         ret = sdw_write(slave, addr2, t_params->blk_pkg_mode);
  88         if (ret < 0) {
  89                 dev_err(bus->dev, "DPN_BlockCtrl3 register write failed\n");
  90                 return ret;
  91         }
  92
  93         /*
  94          * Data ports are FULL, SIMPLE and REDUCED. This function handles
  95          * FULL and REDUCED only and beyond this point only FULL is
  96          * handled, so bail out if we are not FULL data port type
  97          */
  98         if (type != SDW_DPN_FULL)
  99                 return ret;
 100
 101         /* Program DPN_SampleCtrl2 register */
 102         wbuf = (t_params->sample_interval - 1);
 103         wbuf &= SDW_DPN_SAMPLECTRL_HIGH;
 104         wbuf >>= SDW_REG_SHIFT(SDW_DPN_SAMPLECTRL_HIGH);
 105
 106         ret = sdw_write(slave, addr3, wbuf);
 107         if (ret < 0) {
 108                 dev_err(bus->dev, "DPN_SampleCtrl2 register write failed\n");
 109                 return ret;
 110         }
 111
 112         /* Program DPN_HCtrl register */
 113         wbuf = t_params->hstart;
 114         wbuf <<= SDW_REG_SHIFT(SDW_DPN_HCTRL_HSTART);
 115         wbuf |= 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 = p_params->data_mode << SDW_REG_SHIFT(SDW_DPN_PORTCTRL_DATAMODE);
 160         wbuf |= 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         unsigned int time_left;
 426         bool intr = false;
 427         int ret = 0, val;
 428         u32 addr;
 429
 430         prep_ch.num = p_rt->num;
 431         prep_ch.ch_mask = p_rt->ch_mask;
 432
 433         dpn_prop = sdw_get_slave_dpn_prop(s_rt->slave,
 434                                           s_rt->direction,
 435                                           prep_ch.num);
 436         if (!dpn_prop) {
 437                 dev_err(bus->dev,
 438                         "Slave Port:%d properties not found\n", prep_ch.num);
 439                 return -EINVAL;
 440         }
 441
 442         prep_ch.prepare = prep;
 443
 444         prep_ch.bank = bus->params.next_bank;
 445
 446         if (dpn_prop->imp_def_interrupts || !dpn_prop->simple_ch_prep_sm)
 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                 time_left = 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                 val &= p_rt->ch_mask;
 486                 if (!time_left || val) {
 487                         dev_err(&s_rt->slave->dev,
 488                                 "Chn prep failed for port:%d\n", prep_ch.num);
 489                         return -ETIMEDOUT;
 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 there is a stream handled by multiple masters
 692          */
 693         multi_link = bus->multi_link && (m_rt_count > 1);
 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         return ret;
 720 }
 721
 722 /**
 723  * sdw_ml_sync_bank_switch: Multilink register bank switch
 724  *
 725  * @bus: SDW bus instance
 726  *
 727  * Caller function should free the buffers on error
 728  */
 729 static int sdw_ml_sync_bank_switch(struct sdw_bus *bus)
 730 {
 731         unsigned long time_left;
 732
 733         if (!bus->multi_link)
 734                 return 0;
 735
 736         /* Wait for completion of transfer */
 737         time_left = wait_for_completion_timeout(&bus->defer_msg.complete,
 738                                                 bus->bank_switch_timeout);
 739
 740         if (!time_left) {
 741                 dev_err(bus->dev, "Controller Timed out on bank switch\n");
 742                 return -ETIMEDOUT;
 743         }
 744
 745         bus->params.curr_bank = !bus->params.curr_bank;
 746         bus->params.next_bank = !bus->params.next_bank;
 747
 748         if (bus->defer_msg.msg) {
 749                 kfree(bus->defer_msg.msg->buf);
 750                 kfree(bus->defer_msg.msg);
 751         }
 752
 753         return 0;
 754 }
 755
 756 static int do_bank_switch(struct sdw_stream_runtime *stream)
 757 {
 758         struct sdw_master_runtime *m_rt;
 759         const struct sdw_master_ops *ops;
 760         struct sdw_bus *bus;
 761         bool multi_link = false;
 762         int ret = 0;
 763
 764         list_for_each_entry(m_rt, &stream->master_list, stream_node) {
 765                 bus = m_rt->bus;
 766                 ops = bus->ops;
 767
 768                 if (bus->multi_link) {
 769                         multi_link = true;
 770                         mutex_lock(&bus->msg_lock);
 771                 }
 772
 773                 /* Pre-bank switch */
 774                 if (ops->pre_bank_switch) {
 775                         ret = ops->pre_bank_switch(bus);
 776                         if (ret < 0) {
 777                                 dev_err(bus->dev,
 778                                         "Pre bank switch op failed: %d\n", ret);
 779                                 goto msg_unlock;
 780                         }
 781                 }
 782
 783                 /*
 784                  * Perform Bank switch operation.
 785                  * For multi link cases, the actual bank switch is
 786                  * synchronized across all Masters and happens later as a
 787                  * part of post_bank_switch ops.
 788                  */
 789                 ret = sdw_bank_switch(bus, stream->m_rt_count);
 790                 if (ret < 0) {
 791                         dev_err(bus->dev, "Bank switch failed: %d\n", ret);
 792                         goto error;
 793                 }
 794         }
 795
 796         /*
 797          * For multi link cases, it is expected that the bank switch is
 798          * triggered by the post_bank_switch for the first Master in the list
 799          * and for the other Masters the post_bank_switch() should return doing
 800          * nothing.
 801          */
 802         list_for_each_entry(m_rt, &stream->master_list, stream_node) {
 803                 bus = m_rt->bus;
 804                 ops = bus->ops;
 805
 806                 /* Post-bank switch */
 807                 if (ops->post_bank_switch) {
 808                         ret = ops->post_bank_switch(bus);
 809                         if (ret < 0) {
 810                                 dev_err(bus->dev,
 811                                         "Post bank switch op failed: %d\n",
 812                                         ret);
 813                                 goto error;
 814                         }
 815                 } else if (bus->multi_link && stream->m_rt_count > 1) {
 816                         dev_err(bus->dev,
 817                                 "Post bank switch ops not implemented\n");
 818                         goto error;
 819                 }
 820
 821                 /* Set the bank switch timeout to default, if not set */
 822                 if (!bus->bank_switch_timeout)
 823                         bus->bank_switch_timeout = DEFAULT_BANK_SWITCH_TIMEOUT;
 824
 825                 /* Check if bank switch was successful */
 826                 ret = sdw_ml_sync_bank_switch(bus);
 827                 if (ret < 0) {
 828                         dev_err(bus->dev,
 829                                 "multi link bank switch failed: %d\n", ret);
 830                         goto error;
 831                 }
 832
 833                 if (bus->multi_link)
 834                         mutex_unlock(&bus->msg_lock);
 835         }
 836
 837         return ret;
 838
 839 error:
 840         list_for_each_entry(m_rt, &stream->master_list, stream_node) {
 841                 bus = m_rt->bus;
 842
 843                 kfree(bus->defer_msg.msg->buf);
 844                 kfree(bus->defer_msg.msg);
 845         }
 846
 847 msg_unlock:
 848
 849         if (multi_link) {
 850                 list_for_each_entry(m_rt, &stream->master_list, stream_node) {
 851                         bus = m_rt->bus;
 852                         if (mutex_is_locked(&bus->msg_lock))
 853                                 mutex_unlock(&bus->msg_lock);
 854                 }
 855         }
 856
 857         return ret;
 858 }
 859
 860 /**
 861  * sdw_release_stream() - Free the assigned stream runtime
 862  *
 863  * @stream: SoundWire stream runtime
 864  *
 865  * sdw_release_stream should be called only once per stream
 866  */
 867 void sdw_release_stream(struct sdw_stream_runtime *stream)
 868 {
 869         kfree(stream);
 870 }
 871 EXPORT_SYMBOL(sdw_release_stream);
 872
 873 /**
 874  * sdw_alloc_stream() - Allocate and return stream runtime
 875  *
 876  * @stream_name: SoundWire stream name
 877  *
 878  * Allocates a SoundWire stream runtime instance.
 879  * sdw_alloc_stream should be called only once per stream. Typically
 880  * invoked from ALSA/ASoC machine/platform driver.
 881  */
 882 struct sdw_stream_runtime *sdw_alloc_stream(const char *stream_name)
 883 {
 884         struct sdw_stream_runtime *stream;
 885
 886         stream = kzalloc(sizeof(*stream), GFP_KERNEL);
 887         if (!stream)
 888                 return NULL;
 889
 890         stream->name = stream_name;
 891         INIT_LIST_HEAD(&stream->master_list);
 892         stream->state = SDW_STREAM_ALLOCATED;
 893         stream->m_rt_count = 0;
 894
 895         return stream;
 896 }
 897 EXPORT_SYMBOL(sdw_alloc_stream);
 898
 899 static struct sdw_master_runtime
 900 *sdw_find_master_rt(struct sdw_bus *bus,
 901                     struct sdw_stream_runtime *stream)
 902 {
 903         struct sdw_master_runtime *m_rt;
 904
 905         /* Retrieve Bus handle if already available */
 906         list_for_each_entry(m_rt, &stream->master_list, stream_node) {
 907                 if (m_rt->bus == bus)
 908                         return m_rt;
 909         }
 910
 911         return NULL;
 912 }
 913
 914 /**
 915  * sdw_alloc_master_rt() - Allocates and initialize Master runtime handle
 916  *
 917  * @bus: SDW bus instance
 918  * @stream_config: Stream configuration
 919  * @stream: Stream runtime handle.
 920  *
 921  * This function is to be called with bus_lock held.
 922  */
 923 static struct sdw_master_runtime
 924 *sdw_alloc_master_rt(struct sdw_bus *bus,
 925                      struct sdw_stream_config *stream_config,
 926                      struct sdw_stream_runtime *stream)
 927 {
 928         struct sdw_master_runtime *m_rt;
 929
 930         /*
 931          * check if Master is already allocated (as a result of Slave adding
 932          * it first), if so skip allocation and go to configure
 933          */
 934         m_rt = sdw_find_master_rt(bus, stream);
 935         if (m_rt)
 936                 goto stream_config;
 937
 938         m_rt = kzalloc(sizeof(*m_rt), GFP_KERNEL);
 939         if (!m_rt)
 940                 return NULL;
 941
 942         /* Initialization of Master runtime handle */
 943         INIT_LIST_HEAD(&m_rt->port_list);
 944         INIT_LIST_HEAD(&m_rt->slave_rt_list);
 945         list_add_tail(&m_rt->stream_node, &stream->master_list);
 946
 947         list_add_tail(&m_rt->bus_node, &bus->m_rt_list);
 948
 949 stream_config:
 950         m_rt->ch_count = stream_config->ch_count;
 951         m_rt->bus = bus;
 952         m_rt->stream = stream;
 953         m_rt->direction = stream_config->direction;
 954
 955         return m_rt;
 956 }
 957
 958 /**
 959  * sdw_alloc_slave_rt() - Allocate and initialize Slave runtime handle.
 960  *
 961  * @slave: Slave handle
 962  * @stream_config: Stream configuration
 963  * @stream: Stream runtime handle
 964  *
 965  * This function is to be called with bus_lock held.
 966  */
 967 static struct sdw_slave_runtime
 968 *sdw_alloc_slave_rt(struct sdw_slave *slave,
 969                     struct sdw_stream_config *stream_config,
 970                     struct sdw_stream_runtime *stream)
 971 {
 972         struct sdw_slave_runtime *s_rt;
 973
 974         s_rt = kzalloc(sizeof(*s_rt), GFP_KERNEL);
 975         if (!s_rt)
 976                 return NULL;
 977
 978         INIT_LIST_HEAD(&s_rt->port_list);
 979         s_rt->ch_count = stream_config->ch_count;
 980         s_rt->direction = stream_config->direction;
 981         s_rt->slave = slave;
 982
 983         return s_rt;
 984 }
 985
 986 static void sdw_master_port_release(struct sdw_bus *bus,
 987                                     struct sdw_master_runtime *m_rt)
 988 {
 989         struct sdw_port_runtime *p_rt, *_p_rt;
 990
 991         list_for_each_entry_safe(p_rt, _p_rt, &m_rt->port_list, port_node) {
 992                 list_del(&p_rt->port_node);
 993                 kfree(p_rt);
 994         }
 995 }
 996
 997 static void sdw_slave_port_release(struct sdw_bus *bus,
 998                                    struct sdw_slave *slave,
 999                                    struct sdw_stream_runtime *stream)
1000 {
1001         struct sdw_port_runtime *p_rt, *_p_rt;
1002         struct sdw_master_runtime *m_rt;
1003         struct sdw_slave_runtime *s_rt;
1004
1005         list_for_each_entry(m_rt, &stream->master_list, stream_node) {
1006                 list_for_each_entry(s_rt, &m_rt->slave_rt_list, m_rt_node) {
1007                         if (s_rt->slave != slave)
1008                                 continue;
1009
1010                         list_for_each_entry_safe(p_rt, _p_rt,
1011                                                  &s_rt->port_list, port_node) {
1012                                 list_del(&p_rt->port_node);
1013                                 kfree(p_rt);
1014                         }
1015                 }
1016         }
1017 }
1018
1019 /**
1020  * sdw_release_slave_stream() - Free Slave(s) runtime handle
1021  *
1022  * @slave: Slave handle.
1023  * @stream: Stream runtime handle.
1024  *
1025  * This function is to be called with bus_lock held.
1026  */
1027 static void sdw_release_slave_stream(struct sdw_slave *slave,
1028                                      struct sdw_stream_runtime *stream)
1029 {
1030         struct sdw_slave_runtime *s_rt, *_s_rt;
1031         struct sdw_master_runtime *m_rt;
1032
1033         list_for_each_entry(m_rt, &stream->master_list, stream_node) {
1034                 /* Retrieve Slave runtime handle */
1035                 list_for_each_entry_safe(s_rt, _s_rt,
1036                                          &m_rt->slave_rt_list, m_rt_node) {
1037                         if (s_rt->slave == slave) {
1038                                 list_del(&s_rt->m_rt_node);
1039                                 kfree(s_rt);
1040                                 return;
1041                         }
1042                 }
1043         }
1044 }
1045
1046 /**
1047  * sdw_release_master_stream() - Free Master runtime handle
1048  *
1049  * @m_rt: Master runtime node
1050  * @stream: Stream runtime handle.
1051  *
1052  * This function is to be called with bus_lock held
1053  * It frees the Master runtime handle and associated Slave(s) runtime
1054  * handle. If this is called first then sdw_release_slave_stream() will have
1055  * no effect as Slave(s) runtime handle would already be freed up.
1056  */
1057 static void sdw_release_master_stream(struct sdw_master_runtime *m_rt,
1058                                       struct sdw_stream_runtime *stream)
1059 {
1060         struct sdw_slave_runtime *s_rt, *_s_rt;
1061
1062         list_for_each_entry_safe(s_rt, _s_rt, &m_rt->slave_rt_list, m_rt_node) {
1063                 sdw_slave_port_release(s_rt->slave->bus, s_rt->slave, stream);
1064                 sdw_release_slave_stream(s_rt->slave, stream);
1065         }
1066
1067         list_del(&m_rt->stream_node);
1068         list_del(&m_rt->bus_node);
1069         kfree(m_rt);
1070 }
1071
1072 /**
1073  * sdw_stream_remove_master() - Remove master from sdw_stream
1074  *
1075  * @bus: SDW Bus instance
1076  * @stream: SoundWire stream
1077  *
1078  * This removes and frees port_rt and master_rt from a stream
1079  */
1080 int sdw_stream_remove_master(struct sdw_bus *bus,
1081                              struct sdw_stream_runtime *stream)
1082 {
1083         struct sdw_master_runtime *m_rt, *_m_rt;
1084
1085         mutex_lock(&bus->bus_lock);
1086
1087         list_for_each_entry_safe(m_rt, _m_rt,
1088                                  &stream->master_list, stream_node) {
1089                 if (m_rt->bus != bus)
1090                         continue;
1091
1092                 sdw_master_port_release(bus, m_rt);
1093                 sdw_release_master_stream(m_rt, stream);
1094                 stream->m_rt_count--;
1095         }
1096
1097         if (list_empty(&stream->master_list))
1098                 stream->state = SDW_STREAM_RELEASED;
1099
1100         mutex_unlock(&bus->bus_lock);
1101
1102         return 0;
1103 }
1104 EXPORT_SYMBOL(sdw_stream_remove_master);
1105
1106 /**
1107  * sdw_stream_remove_slave() - Remove slave from sdw_stream
1108  *
1109  * @slave: SDW Slave instance
1110  * @stream: SoundWire stream
1111  *
1112  * This removes and frees port_rt and slave_rt from a stream
1113  */
1114 int sdw_stream_remove_slave(struct sdw_slave *slave,
1115                             struct sdw_stream_runtime *stream)
1116 {
1117         mutex_lock(&slave->bus->bus_lock);
1118
1119         sdw_slave_port_release(slave->bus, slave, stream);
1120         sdw_release_slave_stream(slave, stream);
1121
1122         mutex_unlock(&slave->bus->bus_lock);
1123
1124         return 0;
1125 }
1126 EXPORT_SYMBOL(sdw_stream_remove_slave);
1127
1128 /**
1129  * sdw_config_stream() - Configure the allocated stream
1130  *
1131  * @dev: SDW device
1132  * @stream: SoundWire stream
1133  * @stream_config: Stream configuration for audio stream
1134  * @is_slave: is API called from Slave or Master
1135  *
1136  * This function is to be called with bus_lock held.
1137  */
1138 static int sdw_config_stream(struct device *dev,
1139                              struct sdw_stream_runtime *stream,
1140                              struct sdw_stream_config *stream_config,
1141                              bool is_slave)
1142 {
1143         /*
1144          * Update the stream rate, channel and bps based on data
1145          * source. For more than one data source (multilink),
1146          * match the rate, bps, stream type and increment number of channels.
1147          *
1148          * If rate/bps is zero, it means the values are not set, so skip
1149          * comparison and allow the value to be set and stored in stream
1150          */
1151         if (stream->params.rate &&
1152             stream->params.rate != stream_config->frame_rate) {
1153                 dev_err(dev, "rate not matching, stream:%s\n", stream->name);
1154                 return -EINVAL;
1155         }
1156
1157         if (stream->params.bps &&
1158             stream->params.bps != stream_config->bps) {
1159                 dev_err(dev, "bps not matching, stream:%s\n", stream->name);
1160                 return -EINVAL;
1161         }
1162
1163         stream->type = stream_config->type;
1164         stream->params.rate = stream_config->frame_rate;
1165         stream->params.bps = stream_config->bps;
1166
1167         /* TODO: Update this check during Device-device support */
1168         if (is_slave)
1169                 stream->params.ch_count += stream_config->ch_count;
1170
1171         return 0;
1172 }
1173
1174 static int sdw_is_valid_port_range(struct device *dev,
1175                                    struct sdw_port_runtime *p_rt)
1176 {
1177         if (!SDW_VALID_PORT_RANGE(p_rt->num)) {
1178                 dev_err(dev,
1179                         "SoundWire: Invalid port number :%d\n", p_rt->num);
1180                 return -EINVAL;
1181         }
1182
1183         return 0;
1184 }
1185
1186 static struct sdw_port_runtime
1187 *sdw_port_alloc(struct device *dev,
1188                 struct sdw_port_config *port_config,
1189                 int port_index)
1190 {
1191         struct sdw_port_runtime *p_rt;
1192
1193         p_rt = kzalloc(sizeof(*p_rt), GFP_KERNEL);
1194         if (!p_rt)
1195                 return NULL;
1196
1197         p_rt->ch_mask = port_config[port_index].ch_mask;
1198         p_rt->num = port_config[port_index].num;
1199
1200         return p_rt;
1201 }
1202
1203 static int sdw_master_port_config(struct sdw_bus *bus,
1204                                   struct sdw_master_runtime *m_rt,
1205                                   struct sdw_port_config *port_config,
1206                                   unsigned int num_ports)
1207 {
1208         struct sdw_port_runtime *p_rt;
1209         int i;
1210
1211         /* Iterate for number of ports to perform initialization */
1212         for (i = 0; i < num_ports; i++) {
1213                 p_rt = sdw_port_alloc(bus->dev, port_config, i);
1214                 if (!p_rt)
1215                         return -ENOMEM;
1216
1217                 /*
1218                  * TODO: Check port capabilities for requested
1219                  * configuration (audio mode support)
1220                  */
1221
1222                 list_add_tail(&p_rt->port_node, &m_rt->port_list);
1223         }
1224
1225         return 0;
1226 }
1227
1228 static int sdw_slave_port_config(struct sdw_slave *slave,
1229                                  struct sdw_slave_runtime *s_rt,
1230                                  struct sdw_port_config *port_config,
1231                                  unsigned int num_config)
1232 {
1233         struct sdw_port_runtime *p_rt;
1234         int i, ret;
1235
1236         /* Iterate for number of ports to perform initialization */
1237         for (i = 0; i < num_config; i++) {
1238                 p_rt = sdw_port_alloc(&slave->dev, port_config, i);
1239                 if (!p_rt)
1240                         return -ENOMEM;
1241
1242                 /*
1243                  * TODO: Check valid port range as defined by DisCo/
1244                  * slave
1245                  */
1246                 ret = sdw_is_valid_port_range(&slave->dev, p_rt);
1247                 if (ret < 0) {
1248                         kfree(p_rt);
1249                         return ret;
1250                 }
1251
1252                 /*
1253                  * TODO: Check port capabilities for requested
1254                  * configuration (audio mode support)
1255                  */
1256
1257                 list_add_tail(&p_rt->port_node, &s_rt->port_list);
1258         }
1259
1260         return 0;
1261 }
1262
1263 /**
1264  * sdw_stream_add_master() - Allocate and add master runtime to a stream
1265  *
1266  * @bus: SDW Bus instance
1267  * @stream_config: Stream configuration for audio stream
1268  * @port_config: Port configuration for audio stream
1269  * @num_ports: Number of ports
1270  * @stream: SoundWire stream
1271  */
1272 int sdw_stream_add_master(struct sdw_bus *bus,
1273                           struct sdw_stream_config *stream_config,
1274                           struct sdw_port_config *port_config,
1275                           unsigned int num_ports,
1276                           struct sdw_stream_runtime *stream)
1277 {
1278         struct sdw_master_runtime *m_rt;
1279         int ret;
1280
1281         mutex_lock(&bus->bus_lock);
1282
1283         /*
1284          * For multi link streams, add the second master only if
1285          * the bus supports it.
1286          * Check if bus->multi_link is set
1287          */
1288         if (!bus->multi_link && stream->m_rt_count > 0) {
1289                 dev_err(bus->dev,
1290                         "Multilink not supported, link %d\n", bus->link_id);
1291                 ret = -EINVAL;
1292                 goto unlock;
1293         }
1294
1295         m_rt = sdw_alloc_master_rt(bus, stream_config, stream);
1296         if (!m_rt) {
1297                 dev_err(bus->dev,
1298                         "Master runtime config failed for stream:%s\n",
1299                         stream->name);
1300                 ret = -ENOMEM;
1301                 goto unlock;
1302         }
1303
1304         ret = sdw_config_stream(bus->dev, stream, stream_config, false);
1305         if (ret)
1306                 goto stream_error;
1307
1308         ret = sdw_master_port_config(bus, m_rt, port_config, num_ports);
1309         if (ret)
1310                 goto stream_error;
1311
1312         stream->m_rt_count++;
1313
1314         goto unlock;
1315
1316 stream_error:
1317         sdw_release_master_stream(m_rt, stream);
1318 unlock:
1319         mutex_unlock(&bus->bus_lock);
1320         return ret;
1321 }
1322 EXPORT_SYMBOL(sdw_stream_add_master);
1323
1324 /**
1325  * sdw_stream_add_slave() - Allocate and add master/slave runtime to a stream
1326  *
1327  * @slave: SDW Slave instance
1328  * @stream_config: Stream configuration for audio stream
1329  * @stream: SoundWire stream
1330  * @port_config: Port configuration for audio stream
1331  * @num_ports: Number of ports
1332  *
1333  * It is expected that Slave is added before adding Master
1334  * to the Stream.
1335  *
1336  */
1337 int sdw_stream_add_slave(struct sdw_slave *slave,
1338                          struct sdw_stream_config *stream_config,
1339                          struct sdw_port_config *port_config,
1340                          unsigned int num_ports,
1341                          struct sdw_stream_runtime *stream)
1342 {
1343         struct sdw_slave_runtime *s_rt;
1344         struct sdw_master_runtime *m_rt;
1345         int ret;
1346
1347         mutex_lock(&slave->bus->bus_lock);
1348
1349         /*
1350          * If this API is invoked by Slave first then m_rt is not valid.
1351          * So, allocate m_rt and add Slave to it.
1352          */
1353         m_rt = sdw_alloc_master_rt(slave->bus, stream_config, stream);
1354         if (!m_rt) {
1355                 dev_err(&slave->dev,
1356                         "alloc master runtime failed for stream:%s\n",
1357                         stream->name);
1358                 ret = -ENOMEM;
1359                 goto error;
1360         }
1361
1362         s_rt = sdw_alloc_slave_rt(slave, stream_config, stream);
1363         if (!s_rt) {
1364                 dev_err(&slave->dev,
1365                         "Slave runtime config failed for stream:%s\n",
1366                         stream->name);
1367                 ret = -ENOMEM;
1368                 goto stream_error;
1369         }
1370
1371         ret = sdw_config_stream(&slave->dev, stream, stream_config, true);
1372         if (ret)
1373                 goto stream_error;
1374
1375         list_add_tail(&s_rt->m_rt_node, &m_rt->slave_rt_list);
1376
1377         ret = sdw_slave_port_config(slave, s_rt, port_config, num_ports);
1378         if (ret)
1379                 goto stream_error;
1380
1381         /*
1382          * Change stream state to CONFIGURED on first Slave add.
1383          * Bus is not aware of number of Slave(s) in a stream at this
1384          * point so cannot depend on all Slave(s) to be added in order to
1385          * change stream state to CONFIGURED.
1386          */
1387         stream->state = SDW_STREAM_CONFIGURED;
1388         goto error;
1389
1390 stream_error:
1391         /*
1392          * we hit error so cleanup the stream, release all Slave(s) and
1393          * Master runtime
1394          */
1395         sdw_release_master_stream(m_rt, stream);
1396 error:
1397         mutex_unlock(&slave->bus->bus_lock);
1398         return ret;
1399 }
1400 EXPORT_SYMBOL(sdw_stream_add_slave);
1401
1402 /**
1403  * sdw_get_slave_dpn_prop() - Get Slave port capabilities
1404  *
1405  * @slave: Slave handle
1406  * @direction: Data direction.
1407  * @port_num: Port number
1408  */
1409 struct sdw_dpn_prop *sdw_get_slave_dpn_prop(struct sdw_slave *slave,
1410                                             enum sdw_data_direction direction,
1411                                             unsigned int port_num)
1412 {
1413         struct sdw_dpn_prop *dpn_prop;
1414         u8 num_ports;
1415         int i;
1416
1417         if (direction == SDW_DATA_DIR_TX) {
1418                 num_ports = hweight32(slave->prop.source_ports);
1419                 dpn_prop = slave->prop.src_dpn_prop;
1420         } else {
1421                 num_ports = hweight32(slave->prop.sink_ports);
1422                 dpn_prop = slave->prop.sink_dpn_prop;
1423         }
1424
1425         for (i = 0; i < num_ports; i++) {
1426                 if (dpn_prop[i].num == port_num)
1427                         return &dpn_prop[i];
1428         }
1429
1430         return NULL;
1431 }
1432
1433 /**
1434  * sdw_acquire_bus_lock: Acquire bus lock for all Master runtime(s)
1435  *
1436  * @stream: SoundWire stream
1437  *
1438  * Acquire bus_lock for each of the master runtime(m_rt) part of this
1439  * stream to reconfigure the bus.
1440  * NOTE: This function is called from SoundWire stream ops and is
1441  * expected that a global lock is held before acquiring bus_lock.
1442  */
1443 static void sdw_acquire_bus_lock(struct sdw_stream_runtime *stream)
1444 {
1445         struct sdw_master_runtime *m_rt;
1446         struct sdw_bus *bus = NULL;
1447
1448         /* Iterate for all Master(s) in Master list */
1449         list_for_each_entry(m_rt, &stream->master_list, stream_node) {
1450                 bus = m_rt->bus;
1451
1452                 mutex_lock(&bus->bus_lock);
1453         }
1454 }
1455
1456 /**
1457  * sdw_release_bus_lock: Release bus lock for all Master runtime(s)
1458  *
1459  * @stream: SoundWire stream
1460  *
1461  * Release the previously held bus_lock after reconfiguring the bus.
1462  * NOTE: This function is called from SoundWire stream ops and is
1463  * expected that a global lock is held before releasing bus_lock.
1464  */
1465 static void sdw_release_bus_lock(struct sdw_stream_runtime *stream)
1466 {
1467         struct sdw_master_runtime *m_rt = NULL;
1468         struct sdw_bus *bus = NULL;
1469
1470         /* Iterate for all Master(s) in Master list */
1471         list_for_each_entry_reverse(m_rt, &stream->master_list, stream_node) {
1472                 bus = m_rt->bus;
1473                 mutex_unlock(&bus->bus_lock);
1474         }
1475 }
1476
1477 static int _sdw_prepare_stream(struct sdw_stream_runtime *stream,
1478                                bool update_params)
1479 {
1480         struct sdw_master_runtime *m_rt;
1481         struct sdw_bus *bus = NULL;
1482         struct sdw_master_prop *prop;
1483         struct sdw_bus_params params;
1484         int ret;
1485
1486         /* Prepare  Master(s) and Slave(s) port(s) associated with stream */
1487         list_for_each_entry(m_rt, &stream->master_list, stream_node) {
1488                 bus = m_rt->bus;
1489                 prop = &bus->prop;
1490                 memcpy(&params, &bus->params, sizeof(params));
1491
1492                 /* TODO: Support Asynchronous mode */
1493                 if ((prop->max_clk_freq % stream->params.rate) != 0) {
1494                         dev_err(bus->dev, "Async mode not supported\n");
1495                         return -EINVAL;
1496                 }
1497
1498                 if (!update_params)
1499                         goto program_params;
1500
1501                 /* Increment cumulative bus bandwidth */
1502                 /* TODO: Update this during Device-Device support */
1503                 bus->params.bandwidth += m_rt->stream->params.rate *
1504                         m_rt->ch_count * m_rt->stream->params.bps;
1505
1506                 /* Compute params */
1507                 if (bus->compute_params) {
1508                         ret = bus->compute_params(bus);
1509                         if (ret < 0) {
1510                                 dev_err(bus->dev, "Compute params failed: %d",
1511                                         ret);
1512                                 return ret;
1513                         }
1514                 }
1515
1516 program_params:
1517                 /* Program params */
1518                 ret = sdw_program_params(bus, true);
1519                 if (ret < 0) {
1520                         dev_err(bus->dev, "Program params failed: %d\n", ret);
1521                         goto restore_params;
1522                 }
1523         }
1524
1525         if (!bus) {
1526                 pr_err("Configuration error in %s\n", __func__);
1527                 return -EINVAL;
1528         }
1529
1530         ret = do_bank_switch(stream);
1531         if (ret < 0) {
1532                 dev_err(bus->dev, "Bank switch failed: %d\n", ret);
1533                 goto restore_params;
1534         }
1535
1536         list_for_each_entry(m_rt, &stream->master_list, stream_node) {
1537                 bus = m_rt->bus;
1538
1539                 /* Prepare port(s) on the new clock configuration */
1540                 ret = sdw_prep_deprep_ports(m_rt, true);
1541                 if (ret < 0) {
1542                         dev_err(bus->dev, "Prepare port(s) failed ret = %d\n",
1543                                 ret);
1544                         return ret;
1545                 }
1546         }
1547
1548         stream->state = SDW_STREAM_PREPARED;
1549
1550         return ret;
1551
1552 restore_params:
1553         memcpy(&bus->params, &params, sizeof(params));
1554         return ret;
1555 }
1556
1557 /**
1558  * sdw_prepare_stream() - Prepare SoundWire stream
1559  *
1560  * @stream: Soundwire stream
1561  *
1562  * Documentation/driver-api/soundwire/stream.rst explains this API in detail
1563  */
1564 int sdw_prepare_stream(struct sdw_stream_runtime *stream)
1565 {
1566         bool update_params = true;
1567         int ret;
1568
1569         if (!stream) {
1570                 pr_err("SoundWire: Handle not found for stream\n");
1571                 return -EINVAL;
1572         }
1573
1574         sdw_acquire_bus_lock(stream);
1575
1576         if (stream->state == SDW_STREAM_PREPARED) {
1577                 ret = 0;
1578                 goto state_err;
1579         }
1580
1581         if (stream->state != SDW_STREAM_CONFIGURED &&
1582             stream->state != SDW_STREAM_DEPREPARED &&
1583             stream->state != SDW_STREAM_DISABLED) {
1584                 pr_err("%s: %s: inconsistent state state %d\n",
1585                        __func__, stream->name, stream->state);
1586                 ret = -EINVAL;
1587                 goto state_err;
1588         }
1589
1590         /*
1591          * when the stream is DISABLED, this means sdw_prepare_stream()
1592          * is called as a result of an underflow or a resume operation.
1593          * In this case, the bus parameters shall not be recomputed, but
1594          * still need to be re-applied
1595          */
1596         if (stream->state == SDW_STREAM_DISABLED)
1597                 update_params = false;
1598
1599         ret = _sdw_prepare_stream(stream, update_params);
1600
1601 state_err:
1602         sdw_release_bus_lock(stream);
1603         return ret;
1604 }
1605 EXPORT_SYMBOL(sdw_prepare_stream);
1606
1607 static int _sdw_enable_stream(struct sdw_stream_runtime *stream)
1608 {
1609         struct sdw_master_runtime *m_rt;
1610         struct sdw_bus *bus = NULL;
1611         int ret;
1612
1613         /* Enable Master(s) and Slave(s) port(s) associated with stream */
1614         list_for_each_entry(m_rt, &stream->master_list, stream_node) {
1615                 bus = m_rt->bus;
1616
1617                 /* Program params */
1618                 ret = sdw_program_params(bus, false);
1619                 if (ret < 0) {
1620                         dev_err(bus->dev, "Program params failed: %d\n", ret);
1621                         return ret;
1622                 }
1623
1624                 /* Enable port(s) */
1625                 ret = sdw_enable_disable_ports(m_rt, true);
1626                 if (ret < 0) {
1627                         dev_err(bus->dev,
1628                                 "Enable port(s) failed ret: %d\n", ret);
1629                         return ret;
1630                 }
1631         }
1632
1633         if (!bus) {
1634                 pr_err("Configuration error in %s\n", __func__);
1635                 return -EINVAL;
1636         }
1637
1638         ret = do_bank_switch(stream);
1639         if (ret < 0) {
1640                 dev_err(bus->dev, "Bank switch failed: %d\n", ret);
1641                 return ret;
1642         }
1643
1644         stream->state = SDW_STREAM_ENABLED;
1645         return 0;
1646 }
1647
1648 /**
1649  * sdw_enable_stream() - Enable SoundWire stream
1650  *
1651  * @stream: Soundwire stream
1652  *
1653  * Documentation/driver-api/soundwire/stream.rst explains this API in detail
1654  */
1655 int sdw_enable_stream(struct sdw_stream_runtime *stream)
1656 {
1657         int ret;
1658
1659         if (!stream) {
1660                 pr_err("SoundWire: Handle not found for stream\n");
1661                 return -EINVAL;
1662         }
1663
1664         sdw_acquire_bus_lock(stream);
1665
1666         if (stream->state != SDW_STREAM_PREPARED &&
1667             stream->state != SDW_STREAM_DISABLED) {
1668                 pr_err("%s: %s: inconsistent state state %d\n",
1669                        __func__, stream->name, stream->state);
1670                 ret = -EINVAL;
1671                 goto state_err;
1672         }
1673
1674         ret = _sdw_enable_stream(stream);
1675
1676 state_err:
1677         sdw_release_bus_lock(stream);
1678         return ret;
1679 }
1680 EXPORT_SYMBOL(sdw_enable_stream);
1681
1682 static int _sdw_disable_stream(struct sdw_stream_runtime *stream)
1683 {
1684         struct sdw_master_runtime *m_rt;
1685         int ret;
1686
1687         list_for_each_entry(m_rt, &stream->master_list, stream_node) {
1688                 struct sdw_bus *bus = m_rt->bus;
1689
1690                 /* Disable port(s) */
1691                 ret = sdw_enable_disable_ports(m_rt, false);
1692                 if (ret < 0) {
1693                         dev_err(bus->dev, "Disable port(s) failed: %d\n", ret);
1694                         return ret;
1695                 }
1696         }
1697         stream->state = SDW_STREAM_DISABLED;
1698
1699         list_for_each_entry(m_rt, &stream->master_list, stream_node) {
1700                 struct sdw_bus *bus = m_rt->bus;
1701
1702                 /* Program params */
1703                 ret = sdw_program_params(bus, false);
1704                 if (ret < 0) {
1705                         dev_err(bus->dev, "Program params failed: %d\n", ret);
1706                         return ret;
1707                 }
1708         }
1709
1710         ret = do_bank_switch(stream);
1711         if (ret < 0) {
1712                 pr_err("Bank switch failed: %d\n", ret);
1713                 return ret;
1714         }
1715
1716         /* make sure alternate bank (previous current) is also disabled */
1717         list_for_each_entry(m_rt, &stream->master_list, stream_node) {
1718                 struct sdw_bus *bus = m_rt->bus;
1719
1720                 /* Disable port(s) */
1721                 ret = sdw_enable_disable_ports(m_rt, false);
1722                 if (ret < 0) {
1723                         dev_err(bus->dev, "Disable port(s) failed: %d\n", ret);
1724                         return ret;
1725                 }
1726         }
1727
1728         return 0;
1729 }
1730
1731 /**
1732  * sdw_disable_stream() - Disable SoundWire stream
1733  *
1734  * @stream: Soundwire stream
1735  *
1736  * Documentation/driver-api/soundwire/stream.rst explains this API in detail
1737  */
1738 int sdw_disable_stream(struct sdw_stream_runtime *stream)
1739 {
1740         int ret;
1741
1742         if (!stream) {
1743                 pr_err("SoundWire: Handle not found for stream\n");
1744                 return -EINVAL;
1745         }
1746
1747         sdw_acquire_bus_lock(stream);
1748
1749         if (stream->state != SDW_STREAM_ENABLED) {
1750                 pr_err("%s: %s: inconsistent state state %d\n",
1751                        __func__, stream->name, stream->state);
1752                 ret = -EINVAL;
1753                 goto state_err;
1754         }
1755
1756         ret = _sdw_disable_stream(stream);
1757
1758 state_err:
1759         sdw_release_bus_lock(stream);
1760         return ret;
1761 }
1762 EXPORT_SYMBOL(sdw_disable_stream);
1763
1764 static int _sdw_deprepare_stream(struct sdw_stream_runtime *stream)
1765 {
1766         struct sdw_master_runtime *m_rt;
1767         struct sdw_bus *bus;
1768         int ret = 0;
1769
1770         list_for_each_entry(m_rt, &stream->master_list, stream_node) {
1771                 bus = m_rt->bus;
1772                 /* De-prepare port(s) */
1773                 ret = sdw_prep_deprep_ports(m_rt, false);
1774                 if (ret < 0) {
1775                         dev_err(bus->dev,
1776                                 "De-prepare port(s) failed: %d\n", ret);
1777                         return ret;
1778                 }
1779
1780                 /* TODO: Update this during Device-Device support */
1781                 bus->params.bandwidth -= m_rt->stream->params.rate *
1782                         m_rt->ch_count * m_rt->stream->params.bps;
1783
1784                 /* Program params */
1785                 ret = sdw_program_params(bus, false);
1786                 if (ret < 0) {
1787                         dev_err(bus->dev, "Program params failed: %d\n", ret);
1788                         return ret;
1789                 }
1790         }
1791
1792         stream->state = SDW_STREAM_DEPREPARED;
1793         return do_bank_switch(stream);
1794 }
1795
1796 /**
1797  * sdw_deprepare_stream() - Deprepare SoundWire stream
1798  *
1799  * @stream: Soundwire stream
1800  *
1801  * Documentation/driver-api/soundwire/stream.rst explains this API in detail
1802  */
1803 int sdw_deprepare_stream(struct sdw_stream_runtime *stream)
1804 {
1805         int ret;
1806
1807         if (!stream) {
1808                 pr_err("SoundWire: Handle not found for stream\n");
1809                 return -EINVAL;
1810         }
1811
1812         sdw_acquire_bus_lock(stream);
1813
1814         if (stream->state != SDW_STREAM_PREPARED &&
1815             stream->state != SDW_STREAM_DISABLED) {
1816                 pr_err("%s: %s: inconsistent state state %d\n",
1817                        __func__, stream->name, stream->state);
1818                 ret = -EINVAL;
1819                 goto state_err;
1820         }
1821
1822         ret = _sdw_deprepare_stream(stream);
1823
1824 state_err:
1825         sdw_release_bus_lock(stream);
1826         return ret;
1827 }
1828 EXPORT_SYMBOL(sdw_deprepare_stream);