drivers/soundwire/stream.c

   1 // SPDX-License-Identifier: (GPL-2.0 OR BSD-3-Clause)
   2 // Copyright(c) 2015-18 Intel Corporation.
   3
   4 /*
   5  *  stream.c - SoundWire Bus stream operations.
   6  */
   7
   8 #include <linux/delay.h>
   9 #include <linux/device.h>
  10 #include <linux/init.h>
  11 #include <linux/module.h>
  12 #include <linux/mod_devicetable.h>
  13 #include <linux/slab.h>
  14 #include <linux/soundwire/sdw_registers.h>
  15 #include <linux/soundwire/sdw.h>
  16 #include <sound/soc.h>
  17 #include "bus.h"
  18
  19 /*
  20  * Array of supported rows and columns as per MIPI SoundWire Specification 1.1
  21  *
  22  * The rows are arranged as per the array index value programmed
  23  * in register. The index 15 has dummy value 0 in order to fill hole.
  24  */
  25 int sdw_rows[SDW_FRAME_ROWS] = {48, 50, 60, 64, 75, 80, 125, 147,
  26                         96, 100, 120, 128, 150, 160, 250, 0,
  27                         192, 200, 240, 256, 72, 144, 90, 180};
  28 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         if (s_rt->slave->is_mockup_device)
 137                 return 0;
 138
 139         dpn_prop = sdw_get_slave_dpn_prop(s_rt->slave,
 140                                           s_rt->direction,
 141                                           t_params->port_num);
 142         if (!dpn_prop)
 143                 return -EINVAL;
 144
 145         addr1 = SDW_DPN_PORTCTRL(t_params->port_num);
 146         addr2 = SDW_DPN_BLOCKCTRL1(t_params->port_num);
 147
 148         if (bus->params.next_bank) {
 149                 addr3 = SDW_DPN_SAMPLECTRL1_B1(t_params->port_num);
 150                 addr4 = SDW_DPN_OFFSETCTRL1_B1(t_params->port_num);
 151                 addr5 = SDW_DPN_BLOCKCTRL2_B1(t_params->port_num);
 152                 addr6 = SDW_DPN_LANECTRL_B1(t_params->port_num);
 153
 154         } else {
 155                 addr3 = SDW_DPN_SAMPLECTRL1_B0(t_params->port_num);
 156                 addr4 = SDW_DPN_OFFSETCTRL1_B0(t_params->port_num);
 157                 addr5 = SDW_DPN_BLOCKCTRL2_B0(t_params->port_num);
 158                 addr6 = SDW_DPN_LANECTRL_B0(t_params->port_num);
 159         }
 160
 161         /* Program DPN_PortCtrl register */
 162         wbuf = FIELD_PREP(SDW_DPN_PORTCTRL_DATAMODE, p_params->data_mode);
 163         wbuf |= FIELD_PREP(SDW_DPN_PORTCTRL_FLOWMODE, p_params->flow_mode);
 164
 165         ret = sdw_update(s_rt->slave, addr1, 0xF, wbuf);
 166         if (ret < 0) {
 167                 dev_err(&s_rt->slave->dev,
 168                         "DPN_PortCtrl register write failed for port %d\n",
 169                         t_params->port_num);
 170                 return ret;
 171         }
 172
 173         if (!dpn_prop->read_only_wordlength) {
 174                 /* Program DPN_BlockCtrl1 register */
 175                 ret = sdw_write(s_rt->slave, addr2, (p_params->bps - 1));
 176                 if (ret < 0) {
 177                         dev_err(&s_rt->slave->dev,
 178                                 "DPN_BlockCtrl1 register write failed for port %d\n",
 179                                 t_params->port_num);
 180                         return ret;
 181                 }
 182         }
 183
 184         /* Program DPN_SampleCtrl1 register */
 185         wbuf = (t_params->sample_interval - 1) & SDW_DPN_SAMPLECTRL_LOW;
 186         ret = sdw_write(s_rt->slave, addr3, wbuf);
 187         if (ret < 0) {
 188                 dev_err(&s_rt->slave->dev,
 189                         "DPN_SampleCtrl1 register write failed for port %d\n",
 190                         t_params->port_num);
 191                 return ret;
 192         }
 193
 194         /* Program DPN_OffsetCtrl1 registers */
 195         ret = sdw_write(s_rt->slave, addr4, t_params->offset1);
 196         if (ret < 0) {
 197                 dev_err(&s_rt->slave->dev,
 198                         "DPN_OffsetCtrl1 register write failed for port %d\n",
 199                         t_params->port_num);
 200                 return ret;
 201         }
 202
 203         /* Program DPN_BlockCtrl2 register*/
 204         if (t_params->blk_grp_ctrl_valid) {
 205                 ret = sdw_write(s_rt->slave, addr5, t_params->blk_grp_ctrl);
 206                 if (ret < 0) {
 207                         dev_err(&s_rt->slave->dev,
 208                                 "DPN_BlockCtrl2 reg write failed for port %d\n",
 209                                 t_params->port_num);
 210                         return ret;
 211                 }
 212         }
 213
 214         /* program DPN_LaneCtrl register */
 215         if (slave_prop->lane_control_support) {
 216                 ret = sdw_write(s_rt->slave, addr6, t_params->lane_ctrl);
 217                 if (ret < 0) {
 218                         dev_err(&s_rt->slave->dev,
 219                                 "DPN_LaneCtrl register write failed for port %d\n",
 220                                 t_params->port_num);
 221                         return ret;
 222                 }
 223         }
 224
 225         if (dpn_prop->type != SDW_DPN_SIMPLE) {
 226                 ret = _sdw_program_slave_port_params(bus, s_rt->slave,
 227                                                      t_params, dpn_prop->type);
 228                 if (ret < 0)
 229                         dev_err(&s_rt->slave->dev,
 230                                 "Transport reg write failed for port: %d\n",
 231                                 t_params->port_num);
 232         }
 233
 234         return ret;
 235 }
 236
 237 static int sdw_program_master_port_params(struct sdw_bus *bus,
 238                                           struct sdw_port_runtime *p_rt)
 239 {
 240         int ret;
 241
 242         /*
 243          * we need to set transport and port parameters for the port.
 244          * Transport parameters refers to the sample interval, offsets and
 245          * hstart/stop etc of the data. Port parameters refers to word
 246          * length, flow mode etc of the port
 247          */
 248         ret = bus->port_ops->dpn_set_port_transport_params(bus,
 249                                         &p_rt->transport_params,
 250                                         bus->params.next_bank);
 251         if (ret < 0)
 252                 return ret;
 253
 254         return bus->port_ops->dpn_set_port_params(bus,
 255                                                   &p_rt->port_params,
 256                                                   bus->params.next_bank);
 257 }
 258
 259 /**
 260  * sdw_program_port_params() - Programs transport parameters of Master(s)
 261  * and Slave(s)
 262  *
 263  * @m_rt: Master stream runtime
 264  */
 265 static int sdw_program_port_params(struct sdw_master_runtime *m_rt)
 266 {
 267         struct sdw_slave_runtime *s_rt;
 268         struct sdw_bus *bus = m_rt->bus;
 269         struct sdw_port_runtime *p_rt;
 270         int ret = 0;
 271
 272         /* Program transport & port parameters for Slave(s) */
 273         list_for_each_entry(s_rt, &m_rt->slave_rt_list, m_rt_node) {
 274                 list_for_each_entry(p_rt, &s_rt->port_list, port_node) {
 275                         ret = sdw_program_slave_port_params(bus, s_rt, p_rt);
 276                         if (ret < 0)
 277                                 return ret;
 278                 }
 279         }
 280
 281         /* Program transport & port parameters for Master(s) */
 282         list_for_each_entry(p_rt, &m_rt->port_list, port_node) {
 283                 ret = sdw_program_master_port_params(bus, p_rt);
 284                 if (ret < 0)
 285                         return ret;
 286         }
 287
 288         return 0;
 289 }
 290
 291 /**
 292  * sdw_enable_disable_slave_ports: Enable/disable slave data port
 293  *
 294  * @bus: bus instance
 295  * @s_rt: slave runtime
 296  * @p_rt: port runtime
 297  * @en: enable or disable operation
 298  *
 299  * This function only sets the enable/disable bits in the relevant bank, the
 300  * actual enable/disable is done with a bank switch
 301  */
 302 static int sdw_enable_disable_slave_ports(struct sdw_bus *bus,
 303                                           struct sdw_slave_runtime *s_rt,
 304                                           struct sdw_port_runtime *p_rt,
 305                                           bool en)
 306 {
 307         struct sdw_transport_params *t_params = &p_rt->transport_params;
 308         u32 addr;
 309         int ret;
 310
 311         if (bus->params.next_bank)
 312                 addr = SDW_DPN_CHANNELEN_B1(p_rt->num);
 313         else
 314                 addr = SDW_DPN_CHANNELEN_B0(p_rt->num);
 315
 316         /*
 317          * Since bus doesn't support sharing a port across two streams,
 318          * it is safe to reset this register
 319          */
 320         if (en)
 321                 ret = sdw_write(s_rt->slave, addr, p_rt->ch_mask);
 322         else
 323                 ret = sdw_write(s_rt->slave, addr, 0x0);
 324
 325         if (ret < 0)
 326                 dev_err(&s_rt->slave->dev,
 327                         "Slave chn_en reg write failed:%d port:%d\n",
 328                         ret, t_params->port_num);
 329
 330         return ret;
 331 }
 332
 333 static int sdw_enable_disable_master_ports(struct sdw_master_runtime *m_rt,
 334                                            struct sdw_port_runtime *p_rt,
 335                                            bool en)
 336 {
 337         struct sdw_transport_params *t_params = &p_rt->transport_params;
 338         struct sdw_bus *bus = m_rt->bus;
 339         struct sdw_enable_ch enable_ch;
 340         int ret;
 341
 342         enable_ch.port_num = p_rt->num;
 343         enable_ch.ch_mask = p_rt->ch_mask;
 344         enable_ch.enable = en;
 345
 346         /* Perform Master port channel(s) enable/disable */
 347         if (bus->port_ops->dpn_port_enable_ch) {
 348                 ret = bus->port_ops->dpn_port_enable_ch(bus,
 349                                                         &enable_ch,
 350                                                         bus->params.next_bank);
 351                 if (ret < 0) {
 352                         dev_err(bus->dev,
 353                                 "Master chn_en write failed:%d port:%d\n",
 354                                 ret, t_params->port_num);
 355                         return ret;
 356                 }
 357         } else {
 358                 dev_err(bus->dev,
 359                         "dpn_port_enable_ch not supported, %s failed\n",
 360                         en ? "enable" : "disable");
 361                 return -EINVAL;
 362         }
 363
 364         return 0;
 365 }
 366
 367 /**
 368  * sdw_enable_disable_ports() - Enable/disable port(s) for Master and
 369  * Slave(s)
 370  *
 371  * @m_rt: Master stream runtime
 372  * @en: mode (enable/disable)
 373  */
 374 static int sdw_enable_disable_ports(struct sdw_master_runtime *m_rt, bool en)
 375 {
 376         struct sdw_port_runtime *s_port, *m_port;
 377         struct sdw_slave_runtime *s_rt;
 378         int ret = 0;
 379
 380         /* Enable/Disable Slave port(s) */
 381         list_for_each_entry(s_rt, &m_rt->slave_rt_list, m_rt_node) {
 382                 list_for_each_entry(s_port, &s_rt->port_list, port_node) {
 383                         ret = sdw_enable_disable_slave_ports(m_rt->bus, s_rt,
 384                                                              s_port, en);
 385                         if (ret < 0)
 386                                 return ret;
 387                 }
 388         }
 389
 390         /* Enable/Disable Master port(s) */
 391         list_for_each_entry(m_port, &m_rt->port_list, port_node) {
 392                 ret = sdw_enable_disable_master_ports(m_rt, m_port, en);
 393                 if (ret < 0)
 394                         return ret;
 395         }
 396
 397         return 0;
 398 }
 399
 400 static int sdw_do_port_prep(struct sdw_slave_runtime *s_rt,
 401                             struct sdw_prepare_ch prep_ch,
 402                             enum sdw_port_prep_ops cmd)
 403 {
 404         const struct sdw_slave_ops *ops = s_rt->slave->ops;
 405         int ret;
 406
 407         if (ops->port_prep) {
 408                 ret = ops->port_prep(s_rt->slave, &prep_ch, cmd);
 409                 if (ret < 0) {
 410                         dev_err(&s_rt->slave->dev,
 411                                 "Slave Port Prep cmd %d failed: %d\n",
 412                                 cmd, ret);
 413                         return ret;
 414                 }
 415         }
 416
 417         return 0;
 418 }
 419
 420 static int sdw_prep_deprep_slave_ports(struct sdw_bus *bus,
 421                                        struct sdw_slave_runtime *s_rt,
 422                                        struct sdw_port_runtime *p_rt,
 423                                        bool prep)
 424 {
 425         struct completion *port_ready;
 426         struct sdw_dpn_prop *dpn_prop;
 427         struct sdw_prepare_ch prep_ch;
 428         bool intr = false;
 429         int ret = 0, val;
 430         u32 addr;
 431
 432         prep_ch.num = p_rt->num;
 433         prep_ch.ch_mask = p_rt->ch_mask;
 434
 435         dpn_prop = sdw_get_slave_dpn_prop(s_rt->slave,
 436                                           s_rt->direction,
 437                                           prep_ch.num);
 438         if (!dpn_prop) {
 439                 dev_err(bus->dev,
 440                         "Slave Port:%d properties not found\n", prep_ch.num);
 441                 return -EINVAL;
 442         }
 443
 444         prep_ch.prepare = prep;
 445
 446         prep_ch.bank = bus->params.next_bank;
 447
 448         if (dpn_prop->imp_def_interrupts || !dpn_prop->simple_ch_prep_sm ||
 449             bus->params.s_data_mode != SDW_PORT_DATA_MODE_NORMAL)
 450                 intr = true;
 451
 452         /*
 453          * Enable interrupt before Port prepare.
 454          * For Port de-prepare, it is assumed that port
 455          * was prepared earlier
 456          */
 457         if (prep && intr) {
 458                 ret = sdw_configure_dpn_intr(s_rt->slave, p_rt->num, prep,
 459                                              dpn_prop->imp_def_interrupts);
 460                 if (ret < 0)
 461                         return ret;
 462         }
 463
 464         /* Inform slave about the impending port prepare */
 465         sdw_do_port_prep(s_rt, prep_ch, SDW_OPS_PORT_PRE_PREP);
 466
 467         /* Prepare Slave port implementing CP_SM */
 468         if (!dpn_prop->simple_ch_prep_sm) {
 469                 addr = SDW_DPN_PREPARECTRL(p_rt->num);
 470
 471                 if (prep)
 472                         ret = sdw_write(s_rt->slave, addr, p_rt->ch_mask);
 473                 else
 474                         ret = sdw_write(s_rt->slave, addr, 0x0);
 475
 476                 if (ret < 0) {
 477                         dev_err(&s_rt->slave->dev,
 478                                 "Slave prep_ctrl reg write failed\n");
 479                         return ret;
 480                 }
 481
 482                 /* Wait for completion on port ready */
 483                 port_ready = &s_rt->slave->port_ready[prep_ch.num];
 484                 wait_for_completion_timeout(port_ready,
 485                         msecs_to_jiffies(dpn_prop->ch_prep_timeout));
 486
 487                 val = sdw_read(s_rt->slave, SDW_DPN_PREPARESTATUS(p_rt->num));
 488                 if ((val < 0) || (val & p_rt->ch_mask)) {
 489                         ret = (val < 0) ? val : -ETIMEDOUT;
 490                         dev_err(&s_rt->slave->dev,
 491                                 "Chn prep failed for port %d: %d\n", prep_ch.num, ret);
 492                         return ret;
 493                 }
 494         }
 495
 496         /* Inform slaves about ports prepared */
 497         sdw_do_port_prep(s_rt, prep_ch, SDW_OPS_PORT_POST_PREP);
 498
 499         /* Disable interrupt after Port de-prepare */
 500         if (!prep && intr)
 501                 ret = sdw_configure_dpn_intr(s_rt->slave, p_rt->num, prep,
 502                                              dpn_prop->imp_def_interrupts);
 503
 504         return ret;
 505 }
 506
 507 static int sdw_prep_deprep_master_ports(struct sdw_master_runtime *m_rt,
 508                                         struct sdw_port_runtime *p_rt,
 509                                         bool prep)
 510 {
 511         struct sdw_transport_params *t_params = &p_rt->transport_params;
 512         struct sdw_bus *bus = m_rt->bus;
 513         const struct sdw_master_port_ops *ops = bus->port_ops;
 514         struct sdw_prepare_ch prep_ch;
 515         int ret = 0;
 516
 517         prep_ch.num = p_rt->num;
 518         prep_ch.ch_mask = p_rt->ch_mask;
 519         prep_ch.prepare = prep; /* Prepare/De-prepare */
 520         prep_ch.bank = bus->params.next_bank;
 521
 522         /* Pre-prepare/Pre-deprepare port(s) */
 523         if (ops->dpn_port_prep) {
 524                 ret = ops->dpn_port_prep(bus, &prep_ch);
 525                 if (ret < 0) {
 526                         dev_err(bus->dev, "Port prepare failed for port:%d\n",
 527                                 t_params->port_num);
 528                         return ret;
 529                 }
 530         }
 531
 532         return ret;
 533 }
 534
 535 /**
 536  * sdw_prep_deprep_ports() - Prepare/De-prepare port(s) for Master(s) and
 537  * Slave(s)
 538  *
 539  * @m_rt: Master runtime handle
 540  * @prep: Prepare or De-prepare
 541  */
 542 static int sdw_prep_deprep_ports(struct sdw_master_runtime *m_rt, bool prep)
 543 {
 544         struct sdw_slave_runtime *s_rt;
 545         struct sdw_port_runtime *p_rt;
 546         int ret = 0;
 547
 548         /* Prepare/De-prepare Slave port(s) */
 549         list_for_each_entry(s_rt, &m_rt->slave_rt_list, m_rt_node) {
 550                 list_for_each_entry(p_rt, &s_rt->port_list, port_node) {
 551                         ret = sdw_prep_deprep_slave_ports(m_rt->bus, s_rt,
 552                                                           p_rt, prep);
 553                         if (ret < 0)
 554                                 return ret;
 555                 }
 556         }
 557
 558         /* Prepare/De-prepare Master port(s) */
 559         list_for_each_entry(p_rt, &m_rt->port_list, port_node) {
 560                 ret = sdw_prep_deprep_master_ports(m_rt, p_rt, prep);
 561                 if (ret < 0)
 562                         return ret;
 563         }
 564
 565         return ret;
 566 }
 567
 568 /**
 569  * sdw_notify_config() - Notify bus configuration
 570  *
 571  * @m_rt: Master runtime handle
 572  *
 573  * This function notifies the Master(s) and Slave(s) of the
 574  * new bus configuration.
 575  */
 576 static int sdw_notify_config(struct sdw_master_runtime *m_rt)
 577 {
 578         struct sdw_slave_runtime *s_rt;
 579         struct sdw_bus *bus = m_rt->bus;
 580         struct sdw_slave *slave;
 581         int ret = 0;
 582
 583         if (bus->ops->set_bus_conf) {
 584                 ret = bus->ops->set_bus_conf(bus, &bus->params);
 585                 if (ret < 0)
 586                         return ret;
 587         }
 588
 589         list_for_each_entry(s_rt, &m_rt->slave_rt_list, m_rt_node) {
 590                 slave = s_rt->slave;
 591
 592                 if (slave->ops->bus_config) {
 593                         ret = slave->ops->bus_config(slave, &bus->params);
 594                         if (ret < 0) {
 595                                 dev_err(bus->dev, "Notify Slave: %d failed\n",
 596                                         slave->dev_num);
 597                                 return ret;
 598                         }
 599                 }
 600         }
 601
 602         return ret;
 603 }
 604
 605 /**
 606  * sdw_program_params() - Program transport and port parameters for Master(s)
 607  * and Slave(s)
 608  *
 609  * @bus: SDW bus instance
 610  * @prepare: true if sdw_program_params() is called by _prepare.
 611  */
 612 static int sdw_program_params(struct sdw_bus *bus, bool prepare)
 613 {
 614         struct sdw_master_runtime *m_rt;
 615         int ret = 0;
 616
 617         list_for_each_entry(m_rt, &bus->m_rt_list, bus_node) {
 618
 619                 /*
 620                  * this loop walks through all master runtimes for a
 621                  * bus, but the ports can only be configured while
 622                  * explicitly preparing a stream or handling an
 623                  * already-prepared stream otherwise.
 624                  */
 625                 if (!prepare &&
 626                     m_rt->stream->state == SDW_STREAM_CONFIGURED)
 627                         continue;
 628
 629                 ret = sdw_program_port_params(m_rt);
 630                 if (ret < 0) {
 631                         dev_err(bus->dev,
 632                                 "Program transport params failed: %d\n", ret);
 633                         return ret;
 634                 }
 635
 636                 ret = sdw_notify_config(m_rt);
 637                 if (ret < 0) {
 638                         dev_err(bus->dev,
 639                                 "Notify bus config failed: %d\n", ret);
 640                         return ret;
 641                 }
 642
 643                 /* Enable port(s) on alternate bank for all active streams */
 644                 if (m_rt->stream->state != SDW_STREAM_ENABLED)
 645                         continue;
 646
 647                 ret = sdw_enable_disable_ports(m_rt, true);
 648                 if (ret < 0) {
 649                         dev_err(bus->dev, "Enable channel failed: %d\n", ret);
 650                         return ret;
 651                 }
 652         }
 653
 654         return ret;
 655 }
 656
 657 static int sdw_bank_switch(struct sdw_bus *bus, int m_rt_count)
 658 {
 659         int col_index, row_index;
 660         bool multi_link;
 661         struct sdw_msg *wr_msg;
 662         u8 *wbuf;
 663         int ret;
 664         u16 addr;
 665
 666         wr_msg = kzalloc(sizeof(*wr_msg), GFP_KERNEL);
 667         if (!wr_msg)
 668                 return -ENOMEM;
 669
 670         bus->defer_msg.msg = wr_msg;
 671
 672         wbuf = kzalloc(sizeof(*wbuf), GFP_KERNEL);
 673         if (!wbuf) {
 674                 ret = -ENOMEM;
 675                 goto error_1;
 676         }
 677
 678         /* Get row and column index to program register */
 679         col_index = sdw_find_col_index(bus->params.col);
 680         row_index = sdw_find_row_index(bus->params.row);
 681         wbuf[0] = col_index | (row_index << 3);
 682
 683         if (bus->params.next_bank)
 684                 addr = SDW_SCP_FRAMECTRL_B1;
 685         else
 686                 addr = SDW_SCP_FRAMECTRL_B0;
 687
 688         sdw_fill_msg(wr_msg, NULL, addr, 1, SDW_BROADCAST_DEV_NUM,
 689                      SDW_MSG_FLAG_WRITE, wbuf);
 690         wr_msg->ssp_sync = true;
 691
 692         /*
 693          * Set the multi_link flag only when both the hardware supports
 694          * and hardware-based sync is required
 695          */
 696         multi_link = bus->multi_link && (m_rt_count >= bus->hw_sync_min_links);
 697
 698         if (multi_link)
 699                 ret = sdw_transfer_defer(bus, wr_msg, &bus->defer_msg);
 700         else
 701                 ret = sdw_transfer(bus, wr_msg);
 702
 703         if (ret < 0 && ret != -ENODATA) {
 704                 dev_err(bus->dev, "Slave frame_ctrl reg write failed\n");
 705                 goto error;
 706         }
 707
 708         if (!multi_link) {
 709                 kfree(wr_msg);
 710                 kfree(wbuf);
 711                 bus->defer_msg.msg = NULL;
 712                 bus->params.curr_bank = !bus->params.curr_bank;
 713                 bus->params.next_bank = !bus->params.next_bank;
 714         }
 715
 716         return 0;
 717
 718 error:
 719         kfree(wbuf);
 720 error_1:
 721         kfree(wr_msg);
 722         bus->defer_msg.msg = NULL;
 723         return ret;
 724 }
 725
 726 /**
 727  * sdw_ml_sync_bank_switch: Multilink register bank switch
 728  *
 729  * @bus: SDW bus instance
 730  *
 731  * Caller function should free the buffers on error
 732  */
 733 static int sdw_ml_sync_bank_switch(struct sdw_bus *bus)
 734 {
 735         unsigned long time_left;
 736
 737         if (!bus->multi_link)
 738                 return 0;
 739
 740         /* Wait for completion of transfer */
 741         time_left = wait_for_completion_timeout(&bus->defer_msg.complete,
 742                                                 bus->bank_switch_timeout);
 743
 744         if (!time_left) {
 745                 dev_err(bus->dev, "Controller Timed out on bank switch\n");
 746                 return -ETIMEDOUT;
 747         }
 748
 749         bus->params.curr_bank = !bus->params.curr_bank;
 750         bus->params.next_bank = !bus->params.next_bank;
 751
 752         if (bus->defer_msg.msg) {
 753                 kfree(bus->defer_msg.msg->buf);
 754                 kfree(bus->defer_msg.msg);
 755         }
 756
 757         return 0;
 758 }
 759
 760 static int do_bank_switch(struct sdw_stream_runtime *stream)
 761 {
 762         struct sdw_master_runtime *m_rt;
 763         const struct sdw_master_ops *ops;
 764         struct sdw_bus *bus;
 765         bool multi_link = false;
 766         int m_rt_count;
 767         int ret = 0;
 768
 769         m_rt_count = stream->m_rt_count;
 770
 771         list_for_each_entry(m_rt, &stream->master_list, stream_node) {
 772                 bus = m_rt->bus;
 773                 ops = bus->ops;
 774
 775                 if (bus->multi_link && m_rt_count >= bus->hw_sync_min_links) {
 776                         multi_link = true;
 777                         mutex_lock(&bus->msg_lock);
 778                 }
 779
 780                 /* Pre-bank switch */
 781                 if (ops->pre_bank_switch) {
 782                         ret = ops->pre_bank_switch(bus);
 783                         if (ret < 0) {
 784                                 dev_err(bus->dev,
 785                                         "Pre bank switch op failed: %d\n", ret);
 786                                 goto msg_unlock;
 787                         }
 788                 }
 789
 790                 /*
 791                  * Perform Bank switch operation.
 792                  * For multi link cases, the actual bank switch is
 793                  * synchronized across all Masters and happens later as a
 794                  * part of post_bank_switch ops.
 795                  */
 796                 ret = sdw_bank_switch(bus, m_rt_count);
 797                 if (ret < 0) {
 798                         dev_err(bus->dev, "Bank switch failed: %d\n", ret);
 799                         goto error;
 800                 }
 801         }
 802
 803         /*
 804          * For multi link cases, it is expected that the bank switch is
 805          * triggered by the post_bank_switch for the first Master in the list
 806          * and for the other Masters the post_bank_switch() should return doing
 807          * nothing.
 808          */
 809         list_for_each_entry(m_rt, &stream->master_list, stream_node) {
 810                 bus = m_rt->bus;
 811                 ops = bus->ops;
 812
 813                 /* Post-bank switch */
 814                 if (ops->post_bank_switch) {
 815                         ret = ops->post_bank_switch(bus);
 816                         if (ret < 0) {
 817                                 dev_err(bus->dev,
 818                                         "Post bank switch op failed: %d\n",
 819                                         ret);
 820                                 goto error;
 821                         }
 822                 } else if (multi_link) {
 823                         dev_err(bus->dev,
 824                                 "Post bank switch ops not implemented\n");
 825                         goto error;
 826                 }
 827
 828                 /* Set the bank switch timeout to default, if not set */
 829                 if (!bus->bank_switch_timeout)
 830                         bus->bank_switch_timeout = DEFAULT_BANK_SWITCH_TIMEOUT;
 831
 832                 /* Check if bank switch was successful */
 833                 ret = sdw_ml_sync_bank_switch(bus);
 834                 if (ret < 0) {
 835                         dev_err(bus->dev,
 836                                 "multi link bank switch failed: %d\n", ret);
 837                         goto error;
 838                 }
 839
 840                 if (multi_link)
 841                         mutex_unlock(&bus->msg_lock);
 842         }
 843
 844         return ret;
 845
 846 error:
 847         list_for_each_entry(m_rt, &stream->master_list, stream_node) {
 848                 bus = m_rt->bus;
 849                 if (bus->defer_msg.msg) {
 850                         kfree(bus->defer_msg.msg->buf);
 851                         kfree(bus->defer_msg.msg);
 852                 }
 853         }
 854
 855 msg_unlock:
 856
 857         if (multi_link) {
 858                 list_for_each_entry(m_rt, &stream->master_list, stream_node) {
 859                         bus = m_rt->bus;
 860                         if (mutex_is_locked(&bus->msg_lock))
 861                                 mutex_unlock(&bus->msg_lock);
 862                 }
 863         }
 864
 865         return ret;
 866 }
 867
 868 /**
 869  * sdw_release_stream() - Free the assigned stream runtime
 870  *
 871  * @stream: SoundWire stream runtime
 872  *
 873  * sdw_release_stream should be called only once per stream
 874  */
 875 void sdw_release_stream(struct sdw_stream_runtime *stream)
 876 {
 877         kfree(stream);
 878 }
 879 EXPORT_SYMBOL(sdw_release_stream);
 880
 881 /**
 882  * sdw_alloc_stream() - Allocate and return stream runtime
 883  *
 884  * @stream_name: SoundWire stream name
 885  *
 886  * Allocates a SoundWire stream runtime instance.
 887  * sdw_alloc_stream should be called only once per stream. Typically
 888  * invoked from ALSA/ASoC machine/platform driver.
 889  */
 890 struct sdw_stream_runtime *sdw_alloc_stream(const char *stream_name)
 891 {
 892         struct sdw_stream_runtime *stream;
 893
 894         stream = kzalloc(sizeof(*stream), GFP_KERNEL);
 895         if (!stream)
 896                 return NULL;
 897
 898         stream->name = stream_name;
 899         INIT_LIST_HEAD(&stream->master_list);
 900         stream->state = SDW_STREAM_ALLOCATED;
 901         stream->m_rt_count = 0;
 902
 903         return stream;
 904 }
 905 EXPORT_SYMBOL(sdw_alloc_stream);
 906
 907 static struct sdw_master_runtime
 908 *sdw_find_master_rt(struct sdw_bus *bus,
 909                     struct sdw_stream_runtime *stream)
 910 {
 911         struct sdw_master_runtime *m_rt;
 912
 913         /* Retrieve Bus handle if already available */
 914         list_for_each_entry(m_rt, &stream->master_list, stream_node) {
 915                 if (m_rt->bus == bus)
 916                         return m_rt;
 917         }
 918
 919         return NULL;
 920 }
 921
 922 /**
 923  * sdw_alloc_master_rt() - Allocates and initialize Master runtime handle
 924  *
 925  * @bus: SDW bus instance
 926  * @stream_config: Stream configuration
 927  * @stream: Stream runtime handle.
 928  *
 929  * This function is to be called with bus_lock held.
 930  */
 931 static struct sdw_master_runtime
 932 *sdw_alloc_master_rt(struct sdw_bus *bus,
 933                      struct sdw_stream_config *stream_config,
 934                      struct sdw_stream_runtime *stream)
 935 {
 936         struct sdw_master_runtime *m_rt;
 937
 938         /*
 939          * check if Master is already allocated (as a result of Slave adding
 940          * it first), if so skip allocation and go to configure
 941          */
 942         m_rt = sdw_find_master_rt(bus, stream);
 943         if (m_rt)
 944                 goto stream_config;
 945
 946         m_rt = kzalloc(sizeof(*m_rt), GFP_KERNEL);
 947         if (!m_rt)
 948                 return NULL;
 949
 950         /* Initialization of Master runtime handle */
 951         INIT_LIST_HEAD(&m_rt->port_list);
 952         INIT_LIST_HEAD(&m_rt->slave_rt_list);
 953         list_add_tail(&m_rt->stream_node, &stream->master_list);
 954
 955         list_add_tail(&m_rt->bus_node, &bus->m_rt_list);
 956
 957 stream_config:
 958         m_rt->ch_count = stream_config->ch_count;
 959         m_rt->bus = bus;
 960         m_rt->stream = stream;
 961         m_rt->direction = stream_config->direction;
 962
 963         return m_rt;
 964 }
 965
 966 /**
 967  * sdw_alloc_slave_rt() - Allocate and initialize Slave runtime handle.
 968  *
 969  * @slave: Slave handle
 970  * @stream_config: Stream configuration
 971  * @stream: Stream runtime handle
 972  *
 973  * This function is to be called with bus_lock held.
 974  */
 975 static struct sdw_slave_runtime
 976 *sdw_alloc_slave_rt(struct sdw_slave *slave,
 977                     struct sdw_stream_config *stream_config,
 978                     struct sdw_stream_runtime *stream)
 979 {
 980         struct sdw_slave_runtime *s_rt;
 981
 982         s_rt = kzalloc(sizeof(*s_rt), GFP_KERNEL);
 983         if (!s_rt)
 984                 return NULL;
 985
 986         INIT_LIST_HEAD(&s_rt->port_list);
 987         s_rt->ch_count = stream_config->ch_count;
 988         s_rt->direction = stream_config->direction;
 989         s_rt->slave = slave;
 990
 991         return s_rt;
 992 }
 993
 994 static void sdw_master_port_release(struct sdw_bus *bus,
 995                                     struct sdw_master_runtime *m_rt)
 996 {
 997         struct sdw_port_runtime *p_rt, *_p_rt;
 998
 999         list_for_each_entry_safe(p_rt, _p_rt, &m_rt->port_list, port_node) {
1000                 list_del(&p_rt->port_node);
1001                 kfree(p_rt);
1002         }
1003 }
1004
1005 static void sdw_slave_port_release(struct sdw_bus *bus,
1006                                    struct sdw_slave *slave,
1007                                    struct sdw_stream_runtime *stream)
1008 {
1009         struct sdw_port_runtime *p_rt, *_p_rt;
1010         struct sdw_master_runtime *m_rt;
1011         struct sdw_slave_runtime *s_rt;
1012
1013         list_for_each_entry(m_rt, &stream->master_list, stream_node) {
1014                 list_for_each_entry(s_rt, &m_rt->slave_rt_list, m_rt_node) {
1015                         if (s_rt->slave != slave)
1016                                 continue;
1017
1018                         list_for_each_entry_safe(p_rt, _p_rt,
1019                                                  &s_rt->port_list, port_node) {
1020                                 list_del(&p_rt->port_node);
1021                                 kfree(p_rt);
1022                         }
1023                 }
1024         }
1025 }
1026
1027 /**
1028  * sdw_release_slave_stream() - Free Slave(s) runtime handle
1029  *
1030  * @slave: Slave handle.
1031  * @stream: Stream runtime handle.
1032  *
1033  * This function is to be called with bus_lock held.
1034  */
1035 static void sdw_release_slave_stream(struct sdw_slave *slave,
1036                                      struct sdw_stream_runtime *stream)
1037 {
1038         struct sdw_slave_runtime *s_rt, *_s_rt;
1039         struct sdw_master_runtime *m_rt;
1040
1041         list_for_each_entry(m_rt, &stream->master_list, stream_node) {
1042                 /* Retrieve Slave runtime handle */
1043                 list_for_each_entry_safe(s_rt, _s_rt,
1044                                          &m_rt->slave_rt_list, m_rt_node) {
1045                         if (s_rt->slave == slave) {
1046                                 list_del(&s_rt->m_rt_node);
1047                                 kfree(s_rt);
1048                                 return;
1049                         }
1050                 }
1051         }
1052 }
1053
1054 /**
1055  * sdw_release_master_stream() - Free Master runtime handle
1056  *
1057  * @m_rt: Master runtime node
1058  * @stream: Stream runtime handle.
1059  *
1060  * This function is to be called with bus_lock held
1061  * It frees the Master runtime handle and associated Slave(s) runtime
1062  * handle. If this is called first then sdw_release_slave_stream() will have
1063  * no effect as Slave(s) runtime handle would already be freed up.
1064  */
1065 static void sdw_release_master_stream(struct sdw_master_runtime *m_rt,
1066                                       struct sdw_stream_runtime *stream)
1067 {
1068         struct sdw_slave_runtime *s_rt, *_s_rt;
1069
1070         list_for_each_entry_safe(s_rt, _s_rt, &m_rt->slave_rt_list, m_rt_node) {
1071                 sdw_slave_port_release(s_rt->slave->bus, s_rt->slave, stream);
1072                 sdw_release_slave_stream(s_rt->slave, stream);
1073         }
1074
1075         list_del(&m_rt->stream_node);
1076         list_del(&m_rt->bus_node);
1077         kfree(m_rt);
1078 }
1079
1080 /**
1081  * sdw_stream_remove_master() - Remove master from sdw_stream
1082  *
1083  * @bus: SDW Bus instance
1084  * @stream: SoundWire stream
1085  *
1086  * This removes and frees port_rt and master_rt from a stream
1087  */
1088 int sdw_stream_remove_master(struct sdw_bus *bus,
1089                              struct sdw_stream_runtime *stream)
1090 {
1091         struct sdw_master_runtime *m_rt, *_m_rt;
1092
1093         mutex_lock(&bus->bus_lock);
1094
1095         list_for_each_entry_safe(m_rt, _m_rt,
1096                                  &stream->master_list, stream_node) {
1097                 if (m_rt->bus != bus)
1098                         continue;
1099
1100                 sdw_master_port_release(bus, m_rt);
1101                 sdw_release_master_stream(m_rt, stream);
1102                 stream->m_rt_count--;
1103         }
1104
1105         if (list_empty(&stream->master_list))
1106                 stream->state = SDW_STREAM_RELEASED;
1107
1108         mutex_unlock(&bus->bus_lock);
1109
1110         return 0;
1111 }
1112 EXPORT_SYMBOL(sdw_stream_remove_master);
1113
1114 /**
1115  * sdw_stream_remove_slave() - Remove slave from sdw_stream
1116  *
1117  * @slave: SDW Slave instance
1118  * @stream: SoundWire stream
1119  *
1120  * This removes and frees port_rt and slave_rt from a stream
1121  */
1122 int sdw_stream_remove_slave(struct sdw_slave *slave,
1123                             struct sdw_stream_runtime *stream)
1124 {
1125         mutex_lock(&slave->bus->bus_lock);
1126
1127         sdw_slave_port_release(slave->bus, slave, stream);
1128         sdw_release_slave_stream(slave, stream);
1129
1130         mutex_unlock(&slave->bus->bus_lock);
1131
1132         return 0;
1133 }
1134 EXPORT_SYMBOL(sdw_stream_remove_slave);
1135
1136 /**
1137  * sdw_config_stream() - Configure the allocated stream
1138  *
1139  * @dev: SDW device
1140  * @stream: SoundWire stream
1141  * @stream_config: Stream configuration for audio stream
1142  * @is_slave: is API called from Slave or Master
1143  *
1144  * This function is to be called with bus_lock held.
1145  */
1146 static int sdw_config_stream(struct device *dev,
1147                              struct sdw_stream_runtime *stream,
1148                              struct sdw_stream_config *stream_config,
1149                              bool is_slave)
1150 {
1151         /*
1152          * Update the stream rate, channel and bps based on data
1153          * source. For more than one data source (multilink),
1154          * match the rate, bps, stream type and increment number of channels.
1155          *
1156          * If rate/bps is zero, it means the values are not set, so skip
1157          * comparison and allow the value to be set and stored in stream
1158          */
1159         if (stream->params.rate &&
1160             stream->params.rate != stream_config->frame_rate) {
1161                 dev_err(dev, "rate not matching, stream:%s\n", stream->name);
1162                 return -EINVAL;
1163         }
1164
1165         if (stream->params.bps &&
1166             stream->params.bps != stream_config->bps) {
1167                 dev_err(dev, "bps not matching, stream:%s\n", stream->name);
1168                 return -EINVAL;
1169         }
1170
1171         stream->type = stream_config->type;
1172         stream->params.rate = stream_config->frame_rate;
1173         stream->params.bps = stream_config->bps;
1174
1175         /* TODO: Update this check during Device-device support */
1176         if (is_slave)
1177                 stream->params.ch_count += stream_config->ch_count;
1178
1179         return 0;
1180 }
1181
1182 static int sdw_is_valid_port_range(struct device *dev,
1183                                    struct sdw_port_runtime *p_rt)
1184 {
1185         if (!SDW_VALID_PORT_RANGE(p_rt->num)) {
1186                 dev_err(dev,
1187                         "SoundWire: Invalid port number :%d\n", p_rt->num);
1188                 return -EINVAL;
1189         }
1190
1191         return 0;
1192 }
1193
1194 static struct sdw_port_runtime
1195 *sdw_port_alloc(struct device *dev,
1196                 struct sdw_port_config *port_config,
1197                 int port_index)
1198 {
1199         struct sdw_port_runtime *p_rt;
1200
1201         p_rt = kzalloc(sizeof(*p_rt), GFP_KERNEL);
1202         if (!p_rt)
1203                 return NULL;
1204
1205         p_rt->ch_mask = port_config[port_index].ch_mask;
1206         p_rt->num = port_config[port_index].num;
1207
1208         return p_rt;
1209 }
1210
1211 static int sdw_master_port_config(struct sdw_bus *bus,
1212                                   struct sdw_master_runtime *m_rt,
1213                                   struct sdw_port_config *port_config,
1214                                   unsigned int num_ports)
1215 {
1216         struct sdw_port_runtime *p_rt;
1217         int i;
1218
1219         /* Iterate for number of ports to perform initialization */
1220         for (i = 0; i < num_ports; i++) {
1221                 p_rt = sdw_port_alloc(bus->dev, port_config, i);
1222                 if (!p_rt)
1223                         return -ENOMEM;
1224
1225                 /*
1226                  * TODO: Check port capabilities for requested
1227                  * configuration (audio mode support)
1228                  */
1229
1230                 list_add_tail(&p_rt->port_node, &m_rt->port_list);
1231         }
1232
1233         return 0;
1234 }
1235
1236 static int sdw_slave_port_config(struct sdw_slave *slave,
1237                                  struct sdw_slave_runtime *s_rt,
1238                                  struct sdw_port_config *port_config,
1239                                  unsigned int num_config)
1240 {
1241         struct sdw_port_runtime *p_rt;
1242         int i, ret;
1243
1244         /* Iterate for number of ports to perform initialization */
1245         for (i = 0; i < num_config; i++) {
1246                 p_rt = sdw_port_alloc(&slave->dev, port_config, i);
1247                 if (!p_rt)
1248                         return -ENOMEM;
1249
1250                 /*
1251                  * TODO: Check valid port range as defined by DisCo/
1252                  * slave
1253                  */
1254                 ret = sdw_is_valid_port_range(&slave->dev, p_rt);
1255                 if (ret < 0) {
1256                         kfree(p_rt);
1257                         return ret;
1258                 }
1259
1260                 /*
1261                  * TODO: Check port capabilities for requested
1262                  * configuration (audio mode support)
1263                  */
1264
1265                 list_add_tail(&p_rt->port_node, &s_rt->port_list);
1266         }
1267
1268         return 0;
1269 }
1270
1271 /**
1272  * sdw_stream_add_master() - Allocate and add master runtime to a stream
1273  *
1274  * @bus: SDW Bus instance
1275  * @stream_config: Stream configuration for audio stream
1276  * @port_config: Port configuration for audio stream
1277  * @num_ports: Number of ports
1278  * @stream: SoundWire stream
1279  */
1280 int sdw_stream_add_master(struct sdw_bus *bus,
1281                           struct sdw_stream_config *stream_config,
1282                           struct sdw_port_config *port_config,
1283                           unsigned int num_ports,
1284                           struct sdw_stream_runtime *stream)
1285 {
1286         struct sdw_master_runtime *m_rt;
1287         int ret;
1288
1289         mutex_lock(&bus->bus_lock);
1290
1291         /*
1292          * For multi link streams, add the second master only if
1293          * the bus supports it.
1294          * Check if bus->multi_link is set
1295          */
1296         if (!bus->multi_link && stream->m_rt_count > 0) {
1297                 dev_err(bus->dev,
1298                         "Multilink not supported, link %d\n", bus->link_id);
1299                 ret = -EINVAL;
1300                 goto unlock;
1301         }
1302
1303         m_rt = sdw_alloc_master_rt(bus, stream_config, stream);
1304         if (!m_rt) {
1305                 dev_err(bus->dev,
1306                         "Master runtime config failed for stream:%s\n",
1307                         stream->name);
1308                 ret = -ENOMEM;
1309                 goto unlock;
1310         }
1311
1312         ret = sdw_config_stream(bus->dev, stream, stream_config, false);
1313         if (ret)
1314                 goto stream_error;
1315
1316         ret = sdw_master_port_config(bus, m_rt, port_config, num_ports);
1317         if (ret)
1318                 goto stream_error;
1319
1320         stream->m_rt_count++;
1321
1322         goto unlock;
1323
1324 stream_error:
1325         sdw_release_master_stream(m_rt, stream);
1326 unlock:
1327         mutex_unlock(&bus->bus_lock);
1328         return ret;
1329 }
1330 EXPORT_SYMBOL(sdw_stream_add_master);
1331
1332 /**
1333  * sdw_stream_add_slave() - Allocate and add master/slave runtime to a stream
1334  *
1335  * @slave: SDW Slave instance
1336  * @stream_config: Stream configuration for audio stream
1337  * @stream: SoundWire stream
1338  * @port_config: Port configuration for audio stream
1339  * @num_ports: Number of ports
1340  *
1341  * It is expected that Slave is added before adding Master
1342  * to the Stream.
1343  *
1344  */
1345 int sdw_stream_add_slave(struct sdw_slave *slave,
1346                          struct sdw_stream_config *stream_config,
1347                          struct sdw_port_config *port_config,
1348                          unsigned int num_ports,
1349                          struct sdw_stream_runtime *stream)
1350 {
1351         struct sdw_slave_runtime *s_rt;
1352         struct sdw_master_runtime *m_rt;
1353         int ret;
1354
1355         mutex_lock(&slave->bus->bus_lock);
1356
1357         /*
1358          * If this API is invoked by Slave first then m_rt is not valid.
1359          * So, allocate m_rt and add Slave to it.
1360          */
1361         m_rt = sdw_alloc_master_rt(slave->bus, stream_config, stream);
1362         if (!m_rt) {
1363                 dev_err(&slave->dev,
1364                         "alloc master runtime failed for stream:%s\n",
1365                         stream->name);
1366                 ret = -ENOMEM;
1367                 goto error;
1368         }
1369
1370         s_rt = sdw_alloc_slave_rt(slave, stream_config, stream);
1371         if (!s_rt) {
1372                 dev_err(&slave->dev,
1373                         "Slave runtime config failed for stream:%s\n",
1374                         stream->name);
1375                 ret = -ENOMEM;
1376                 goto stream_error;
1377         }
1378
1379         ret = sdw_config_stream(&slave->dev, stream, stream_config, true);
1380         if (ret) {
1381                 /*
1382                  * sdw_release_master_stream will release s_rt in slave_rt_list in
1383                  * stream_error case, but s_rt is only added to slave_rt_list
1384                  * when sdw_config_stream is successful, so free s_rt explicitly
1385                  * when sdw_config_stream is failed.
1386                  */
1387                 kfree(s_rt);
1388                 goto stream_error;
1389         }
1390
1391         list_add_tail(&s_rt->m_rt_node, &m_rt->slave_rt_list);
1392
1393         ret = sdw_slave_port_config(slave, s_rt, port_config, num_ports);
1394         if (ret)
1395                 goto stream_error;
1396
1397         /*
1398          * Change stream state to CONFIGURED on first Slave add.
1399          * Bus is not aware of number of Slave(s) in a stream at this
1400          * point so cannot depend on all Slave(s) to be added in order to
1401          * change stream state to CONFIGURED.
1402          */
1403         stream->state = SDW_STREAM_CONFIGURED;
1404         goto error;
1405
1406 stream_error:
1407         /*
1408          * we hit error so cleanup the stream, release all Slave(s) and
1409          * Master runtime
1410          */
1411         sdw_release_master_stream(m_rt, stream);
1412 error:
1413         mutex_unlock(&slave->bus->bus_lock);
1414         return ret;
1415 }
1416 EXPORT_SYMBOL(sdw_stream_add_slave);
1417
1418 /**
1419  * sdw_get_slave_dpn_prop() - Get Slave port capabilities
1420  *
1421  * @slave: Slave handle
1422  * @direction: Data direction.
1423  * @port_num: Port number
1424  */
1425 struct sdw_dpn_prop *sdw_get_slave_dpn_prop(struct sdw_slave *slave,
1426                                             enum sdw_data_direction direction,
1427                                             unsigned int port_num)
1428 {
1429         struct sdw_dpn_prop *dpn_prop;
1430         u8 num_ports;
1431         int i;
1432
1433         if (direction == SDW_DATA_DIR_TX) {
1434                 num_ports = hweight32(slave->prop.source_ports);
1435                 dpn_prop = slave->prop.src_dpn_prop;
1436         } else {
1437                 num_ports = hweight32(slave->prop.sink_ports);
1438                 dpn_prop = slave->prop.sink_dpn_prop;
1439         }
1440
1441         for (i = 0; i < num_ports; i++) {
1442                 if (dpn_prop[i].num == port_num)
1443                         return &dpn_prop[i];
1444         }
1445
1446         return NULL;
1447 }
1448
1449 /**
1450  * sdw_acquire_bus_lock: Acquire bus lock for all Master runtime(s)
1451  *
1452  * @stream: SoundWire stream
1453  *
1454  * Acquire bus_lock for each of the master runtime(m_rt) part of this
1455  * stream to reconfigure the bus.
1456  * NOTE: This function is called from SoundWire stream ops and is
1457  * expected that a global lock is held before acquiring bus_lock.
1458  */
1459 static void sdw_acquire_bus_lock(struct sdw_stream_runtime *stream)
1460 {
1461         struct sdw_master_runtime *m_rt;
1462         struct sdw_bus *bus;
1463
1464         /* Iterate for all Master(s) in Master list */
1465         list_for_each_entry(m_rt, &stream->master_list, stream_node) {
1466                 bus = m_rt->bus;
1467
1468                 mutex_lock(&bus->bus_lock);
1469         }
1470 }
1471
1472 /**
1473  * sdw_release_bus_lock: Release bus lock for all Master runtime(s)
1474  *
1475  * @stream: SoundWire stream
1476  *
1477  * Release the previously held bus_lock after reconfiguring the bus.
1478  * NOTE: This function is called from SoundWire stream ops and is
1479  * expected that a global lock is held before releasing bus_lock.
1480  */
1481 static void sdw_release_bus_lock(struct sdw_stream_runtime *stream)
1482 {
1483         struct sdw_master_runtime *m_rt;
1484         struct sdw_bus *bus;
1485
1486         /* Iterate for all Master(s) in Master list */
1487         list_for_each_entry_reverse(m_rt, &stream->master_list, stream_node) {
1488                 bus = m_rt->bus;
1489                 mutex_unlock(&bus->bus_lock);
1490         }
1491 }
1492
1493 static int _sdw_prepare_stream(struct sdw_stream_runtime *stream,
1494                                bool update_params)
1495 {
1496         struct sdw_master_runtime *m_rt;
1497         struct sdw_bus *bus = NULL;
1498         struct sdw_master_prop *prop;
1499         struct sdw_bus_params params;
1500         int ret;
1501
1502         /* Prepare  Master(s) and Slave(s) port(s) associated with stream */
1503         list_for_each_entry(m_rt, &stream->master_list, stream_node) {
1504                 bus = m_rt->bus;
1505                 prop = &bus->prop;
1506                 memcpy(&params, &bus->params, sizeof(params));
1507
1508                 /* TODO: Support Asynchronous mode */
1509                 if ((prop->max_clk_freq % stream->params.rate) != 0) {
1510                         dev_err(bus->dev, "Async mode not supported\n");
1511                         return -EINVAL;
1512                 }
1513
1514                 if (!update_params)
1515                         goto program_params;
1516
1517                 /* Increment cumulative bus bandwidth */
1518                 /* TODO: Update this during Device-Device support */
1519                 bus->params.bandwidth += m_rt->stream->params.rate *
1520                         m_rt->ch_count * m_rt->stream->params.bps;
1521
1522                 /* Compute params */
1523                 if (bus->compute_params) {
1524                         ret = bus->compute_params(bus);
1525                         if (ret < 0) {
1526                                 dev_err(bus->dev, "Compute params failed: %d\n",
1527                                         ret);
1528                                 return ret;
1529                         }
1530                 }
1531
1532 program_params:
1533                 /* Program params */
1534                 ret = sdw_program_params(bus, true);
1535                 if (ret < 0) {
1536                         dev_err(bus->dev, "Program params failed: %d\n", ret);
1537                         goto restore_params;
1538                 }
1539         }
1540
1541         if (!bus) {
1542                 pr_err("Configuration error in %s\n", __func__);
1543                 return -EINVAL;
1544         }
1545
1546         ret = do_bank_switch(stream);
1547         if (ret < 0) {
1548                 dev_err(bus->dev, "Bank switch failed: %d\n", ret);
1549                 goto restore_params;
1550         }
1551
1552         list_for_each_entry(m_rt, &stream->master_list, stream_node) {
1553                 bus = m_rt->bus;
1554
1555                 /* Prepare port(s) on the new clock configuration */
1556                 ret = sdw_prep_deprep_ports(m_rt, true);
1557                 if (ret < 0) {
1558                         dev_err(bus->dev, "Prepare port(s) failed ret = %d\n",
1559                                 ret);
1560                         return ret;
1561                 }
1562         }
1563
1564         stream->state = SDW_STREAM_PREPARED;
1565
1566         return ret;
1567
1568 restore_params:
1569         memcpy(&bus->params, &params, sizeof(params));
1570         return ret;
1571 }
1572
1573 /**
1574  * sdw_prepare_stream() - Prepare SoundWire stream
1575  *
1576  * @stream: Soundwire stream
1577  *
1578  * Documentation/driver-api/soundwire/stream.rst explains this API in detail
1579  */
1580 int sdw_prepare_stream(struct sdw_stream_runtime *stream)
1581 {
1582         bool update_params = true;
1583         int ret;
1584
1585         if (!stream) {
1586                 pr_err("SoundWire: Handle not found for stream\n");
1587                 return -EINVAL;
1588         }
1589
1590         sdw_acquire_bus_lock(stream);
1591
1592         if (stream->state == SDW_STREAM_PREPARED) {
1593                 ret = 0;
1594                 goto state_err;
1595         }
1596
1597         if (stream->state != SDW_STREAM_CONFIGURED &&
1598             stream->state != SDW_STREAM_DEPREPARED &&
1599             stream->state != SDW_STREAM_DISABLED) {
1600                 pr_err("%s: %s: inconsistent state state %d\n",
1601                        __func__, stream->name, stream->state);
1602                 ret = -EINVAL;
1603                 goto state_err;
1604         }
1605
1606         /*
1607          * when the stream is DISABLED, this means sdw_prepare_stream()
1608          * is called as a result of an underflow or a resume operation.
1609          * In this case, the bus parameters shall not be recomputed, but
1610          * still need to be re-applied
1611          */
1612         if (stream->state == SDW_STREAM_DISABLED)
1613                 update_params = false;
1614
1615         ret = _sdw_prepare_stream(stream, update_params);
1616
1617 state_err:
1618         sdw_release_bus_lock(stream);
1619         return ret;
1620 }
1621 EXPORT_SYMBOL(sdw_prepare_stream);
1622
1623 static int _sdw_enable_stream(struct sdw_stream_runtime *stream)
1624 {
1625         struct sdw_master_runtime *m_rt;
1626         struct sdw_bus *bus = NULL;
1627         int ret;
1628
1629         /* Enable Master(s) and Slave(s) port(s) associated with stream */
1630         list_for_each_entry(m_rt, &stream->master_list, stream_node) {
1631                 bus = m_rt->bus;
1632
1633                 /* Program params */
1634                 ret = sdw_program_params(bus, false);
1635                 if (ret < 0) {
1636                         dev_err(bus->dev, "Program params failed: %d\n", ret);
1637                         return ret;
1638                 }
1639
1640                 /* Enable port(s) */
1641                 ret = sdw_enable_disable_ports(m_rt, true);
1642                 if (ret < 0) {
1643                         dev_err(bus->dev,
1644                                 "Enable port(s) failed ret: %d\n", ret);
1645                         return ret;
1646                 }
1647         }
1648
1649         if (!bus) {
1650                 pr_err("Configuration error in %s\n", __func__);
1651                 return -EINVAL;
1652         }
1653
1654         ret = do_bank_switch(stream);
1655         if (ret < 0) {
1656                 dev_err(bus->dev, "Bank switch failed: %d\n", ret);
1657                 return ret;
1658         }
1659
1660         stream->state = SDW_STREAM_ENABLED;
1661         return 0;
1662 }
1663
1664 /**
1665  * sdw_enable_stream() - Enable SoundWire stream
1666  *
1667  * @stream: Soundwire stream
1668  *
1669  * Documentation/driver-api/soundwire/stream.rst explains this API in detail
1670  */
1671 int sdw_enable_stream(struct sdw_stream_runtime *stream)
1672 {
1673         int ret;
1674
1675         if (!stream) {
1676                 pr_err("SoundWire: Handle not found for stream\n");
1677                 return -EINVAL;
1678         }
1679
1680         sdw_acquire_bus_lock(stream);
1681
1682         if (stream->state != SDW_STREAM_PREPARED &&
1683             stream->state != SDW_STREAM_DISABLED) {
1684                 pr_err("%s: %s: inconsistent state state %d\n",
1685                        __func__, stream->name, stream->state);
1686                 ret = -EINVAL;
1687                 goto state_err;
1688         }
1689
1690         ret = _sdw_enable_stream(stream);
1691
1692 state_err:
1693         sdw_release_bus_lock(stream);
1694         return ret;
1695 }
1696 EXPORT_SYMBOL(sdw_enable_stream);
1697
1698 static int _sdw_disable_stream(struct sdw_stream_runtime *stream)
1699 {
1700         struct sdw_master_runtime *m_rt;
1701         int ret;
1702
1703         list_for_each_entry(m_rt, &stream->master_list, stream_node) {
1704                 struct sdw_bus *bus = m_rt->bus;
1705
1706                 /* Disable port(s) */
1707                 ret = sdw_enable_disable_ports(m_rt, false);
1708                 if (ret < 0) {
1709                         dev_err(bus->dev, "Disable port(s) failed: %d\n", ret);
1710                         return ret;
1711                 }
1712         }
1713         stream->state = SDW_STREAM_DISABLED;
1714
1715         list_for_each_entry(m_rt, &stream->master_list, stream_node) {
1716                 struct sdw_bus *bus = m_rt->bus;
1717
1718                 /* Program params */
1719                 ret = sdw_program_params(bus, false);
1720                 if (ret < 0) {
1721                         dev_err(bus->dev, "Program params failed: %d\n", ret);
1722                         return ret;
1723                 }
1724         }
1725
1726         ret = do_bank_switch(stream);
1727         if (ret < 0) {
1728                 pr_err("Bank switch failed: %d\n", ret);
1729                 return ret;
1730         }
1731
1732         /* make sure alternate bank (previous current) is also disabled */
1733         list_for_each_entry(m_rt, &stream->master_list, stream_node) {
1734                 struct sdw_bus *bus = m_rt->bus;
1735
1736                 /* Disable port(s) */
1737                 ret = sdw_enable_disable_ports(m_rt, false);
1738                 if (ret < 0) {
1739                         dev_err(bus->dev, "Disable port(s) failed: %d\n", ret);
1740                         return ret;
1741                 }
1742         }
1743
1744         return 0;
1745 }
1746
1747 /**
1748  * sdw_disable_stream() - Disable SoundWire stream
1749  *
1750  * @stream: Soundwire stream
1751  *
1752  * Documentation/driver-api/soundwire/stream.rst explains this API in detail
1753  */
1754 int sdw_disable_stream(struct sdw_stream_runtime *stream)
1755 {
1756         int ret;
1757
1758         if (!stream) {
1759                 pr_err("SoundWire: Handle not found for stream\n");
1760                 return -EINVAL;
1761         }
1762
1763         sdw_acquire_bus_lock(stream);
1764
1765         if (stream->state != SDW_STREAM_ENABLED) {
1766                 pr_err("%s: %s: inconsistent state state %d\n",
1767                        __func__, stream->name, stream->state);
1768                 ret = -EINVAL;
1769                 goto state_err;
1770         }
1771
1772         ret = _sdw_disable_stream(stream);
1773
1774 state_err:
1775         sdw_release_bus_lock(stream);
1776         return ret;
1777 }
1778 EXPORT_SYMBOL(sdw_disable_stream);
1779
1780 static int _sdw_deprepare_stream(struct sdw_stream_runtime *stream)
1781 {
1782         struct sdw_master_runtime *m_rt;
1783         struct sdw_bus *bus;
1784         int ret = 0;
1785
1786         list_for_each_entry(m_rt, &stream->master_list, stream_node) {
1787                 bus = m_rt->bus;
1788                 /* De-prepare port(s) */
1789                 ret = sdw_prep_deprep_ports(m_rt, false);
1790                 if (ret < 0) {
1791                         dev_err(bus->dev,
1792                                 "De-prepare port(s) failed: %d\n", ret);
1793                         return ret;
1794                 }
1795
1796                 /* TODO: Update this during Device-Device support */
1797                 bus->params.bandwidth -= m_rt->stream->params.rate *
1798                         m_rt->ch_count * m_rt->stream->params.bps;
1799
1800                 /* Compute params */
1801                 if (bus->compute_params) {
1802                         ret = bus->compute_params(bus);
1803                         if (ret < 0) {
1804                                 dev_err(bus->dev, "Compute params failed: %d\n",
1805                                         ret);
1806                                 return ret;
1807                         }
1808                 }
1809
1810                 /* Program params */
1811                 ret = sdw_program_params(bus, false);
1812                 if (ret < 0) {
1813                         dev_err(bus->dev, "Program params failed: %d\n", ret);
1814                         return ret;
1815                 }
1816         }
1817
1818         stream->state = SDW_STREAM_DEPREPARED;
1819         return do_bank_switch(stream);
1820 }
1821
1822 /**
1823  * sdw_deprepare_stream() - Deprepare SoundWire stream
1824  *
1825  * @stream: Soundwire stream
1826  *
1827  * Documentation/driver-api/soundwire/stream.rst explains this API in detail
1828  */
1829 int sdw_deprepare_stream(struct sdw_stream_runtime *stream)
1830 {
1831         int ret;
1832
1833         if (!stream) {
1834                 pr_err("SoundWire: Handle not found for stream\n");
1835                 return -EINVAL;
1836         }
1837
1838         sdw_acquire_bus_lock(stream);
1839
1840         if (stream->state != SDW_STREAM_PREPARED &&
1841             stream->state != SDW_STREAM_DISABLED) {
1842                 pr_err("%s: %s: inconsistent state state %d\n",
1843                        __func__, stream->name, stream->state);
1844                 ret = -EINVAL;
1845                 goto state_err;
1846         }
1847
1848         ret = _sdw_deprepare_stream(stream);
1849
1850 state_err:
1851         sdw_release_bus_lock(stream);
1852         return ret;
1853 }
1854 EXPORT_SYMBOL(sdw_deprepare_stream);
1855
1856 static int set_stream(struct snd_pcm_substream *substream,
1857                       struct sdw_stream_runtime *sdw_stream)
1858 {
1859         struct snd_soc_pcm_runtime *rtd = substream->private_data;
1860         struct snd_soc_dai *dai;
1861         int ret = 0;
1862         int i;
1863
1864         /* Set stream pointer on all DAIs */
1865         for_each_rtd_dais(rtd, i, dai) {
1866                 ret = snd_soc_dai_set_sdw_stream(dai, sdw_stream, substream->stream);
1867                 if (ret < 0) {
1868                         dev_err(rtd->dev, "failed to set stream pointer on dai %s\n", dai->name);
1869                         break;
1870                 }
1871         }
1872
1873         return ret;
1874 }
1875
1876 /**
1877  * sdw_startup_stream() - Startup SoundWire stream
1878  *
1879  * @sdw_substream: Soundwire stream
1880  *
1881  * Documentation/driver-api/soundwire/stream.rst explains this API in detail
1882  */
1883 int sdw_startup_stream(void *sdw_substream)
1884 {
1885         struct snd_pcm_substream *substream = sdw_substream;
1886         struct snd_soc_pcm_runtime *rtd = substream->private_data;
1887         struct sdw_stream_runtime *sdw_stream;
1888         char *name;
1889         int ret;
1890
1891         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
1892                 name = kasprintf(GFP_KERNEL, "%s-Playback", substream->name);
1893         else
1894                 name = kasprintf(GFP_KERNEL, "%s-Capture", substream->name);
1895
1896         if (!name)
1897                 return -ENOMEM;
1898
1899         sdw_stream = sdw_alloc_stream(name);
1900         if (!sdw_stream) {
1901                 dev_err(rtd->dev, "alloc stream failed for substream DAI %s\n", substream->name);
1902                 ret = -ENOMEM;
1903                 goto error;
1904         }
1905
1906         ret = set_stream(substream, sdw_stream);
1907         if (ret < 0)
1908                 goto release_stream;
1909         return 0;
1910
1911 release_stream:
1912         sdw_release_stream(sdw_stream);
1913         set_stream(substream, NULL);
1914 error:
1915         kfree(name);
1916         return ret;
1917 }
1918 EXPORT_SYMBOL(sdw_startup_stream);
1919
1920 /**
1921  * sdw_shutdown_stream() - Shutdown SoundWire stream
1922  *
1923  * @sdw_substream: Soundwire stream
1924  *
1925  * Documentation/driver-api/soundwire/stream.rst explains this API in detail
1926  */
1927 void sdw_shutdown_stream(void *sdw_substream)
1928 {
1929         struct snd_pcm_substream *substream = sdw_substream;
1930         struct snd_soc_pcm_runtime *rtd = substream->private_data;
1931         struct sdw_stream_runtime *sdw_stream;
1932         struct snd_soc_dai *dai;
1933
1934         /* Find stream from first CPU DAI */
1935         dai = asoc_rtd_to_cpu(rtd, 0);
1936
1937         sdw_stream = snd_soc_dai_get_sdw_stream(dai, substream->stream);
1938
1939         if (IS_ERR(sdw_stream)) {
1940                 dev_err(rtd->dev, "no stream found for DAI %s\n", dai->name);
1941                 return;
1942         }
1943
1944         /* release memory */
1945         kfree(sdw_stream->name);
1946         sdw_release_stream(sdw_stream);
1947
1948         /* clear DAI data */
1949         set_stream(substream, NULL);
1950 }
1951 EXPORT_SYMBOL(sdw_shutdown_stream);