drivers/soundwire/cadence_master.c

   1 // SPDX-License-Identifier: (GPL-2.0 OR BSD-3-Clause)
   2 // Copyright(c) 2015-17 Intel Corporation.
   3
   4 /*
   5  * Cadence SoundWire Master module
   6  * Used by Master driver
   7  */
   8
   9 #include <linux/delay.h>
  10 #include <linux/device.h>
  11 #include <linux/debugfs.h>
  12 #include <linux/interrupt.h>
  13 #include <linux/io.h>
  14 #include <linux/module.h>
  15 #include <linux/mod_devicetable.h>
  16 #include <linux/pm_runtime.h>
  17 #include <linux/soundwire/sdw_registers.h>
  18 #include <linux/soundwire/sdw.h>
  19 #include <sound/pcm_params.h>
  20 #include <sound/soc.h>
  21 #include <linux/workqueue.h>
  22 #include "bus.h"
  23 #include "cadence_master.h"
  24
  25 static int interrupt_mask;
  26 module_param_named(cnds_mcp_int_mask, interrupt_mask, int, 0444);
  27 MODULE_PARM_DESC(cdns_mcp_int_mask, "Cadence MCP IntMask");
  28
  29 #define CDNS_MCP_CONFIG                         0x0
  30
  31 #define CDNS_MCP_CONFIG_MCMD_RETRY              GENMASK(27, 24)
  32 #define CDNS_MCP_CONFIG_MPREQ_DELAY             GENMASK(20, 16)
  33 #define CDNS_MCP_CONFIG_MMASTER                 BIT(7)
  34 #define CDNS_MCP_CONFIG_BUS_REL                 BIT(6)
  35 #define CDNS_MCP_CONFIG_SNIFFER                 BIT(5)
  36 #define CDNS_MCP_CONFIG_SSPMOD                  BIT(4)
  37 #define CDNS_MCP_CONFIG_CMD                     BIT(3)
  38 #define CDNS_MCP_CONFIG_OP                      GENMASK(2, 0)
  39 #define CDNS_MCP_CONFIG_OP_NORMAL               0
  40
  41 #define CDNS_MCP_CONTROL                        0x4
  42
  43 #define CDNS_MCP_CONTROL_RST_DELAY              GENMASK(10, 8)
  44 #define CDNS_MCP_CONTROL_CMD_RST                BIT(7)
  45 #define CDNS_MCP_CONTROL_SOFT_RST               BIT(6)
  46 #define CDNS_MCP_CONTROL_SW_RST                 BIT(5)
  47 #define CDNS_MCP_CONTROL_HW_RST                 BIT(4)
  48 #define CDNS_MCP_CONTROL_CLK_PAUSE              BIT(3)
  49 #define CDNS_MCP_CONTROL_CLK_STOP_CLR           BIT(2)
  50 #define CDNS_MCP_CONTROL_CMD_ACCEPT             BIT(1)
  51 #define CDNS_MCP_CONTROL_BLOCK_WAKEUP           BIT(0)
  52
  53 #define CDNS_MCP_CMDCTRL                        0x8
  54
  55 #define CDNS_MCP_CMDCTRL_INSERT_PARITY_ERR      BIT(2)
  56
  57 #define CDNS_MCP_SSPSTAT                        0xC
  58 #define CDNS_MCP_FRAME_SHAPE                    0x10
  59 #define CDNS_MCP_FRAME_SHAPE_INIT               0x14
  60 #define CDNS_MCP_FRAME_SHAPE_COL_MASK           GENMASK(2, 0)
  61 #define CDNS_MCP_FRAME_SHAPE_ROW_MASK           GENMASK(7, 3)
  62
  63 #define CDNS_MCP_CONFIG_UPDATE                  0x18
  64 #define CDNS_MCP_CONFIG_UPDATE_BIT              BIT(0)
  65
  66 #define CDNS_MCP_PHYCTRL                        0x1C
  67 #define CDNS_MCP_SSP_CTRL0                      0x20
  68 #define CDNS_MCP_SSP_CTRL1                      0x28
  69 #define CDNS_MCP_CLK_CTRL0                      0x30
  70 #define CDNS_MCP_CLK_CTRL1                      0x38
  71 #define CDNS_MCP_CLK_MCLKD_MASK         GENMASK(7, 0)
  72
  73 #define CDNS_MCP_STAT                           0x40
  74
  75 #define CDNS_MCP_STAT_ACTIVE_BANK               BIT(20)
  76 #define CDNS_MCP_STAT_CLK_STOP                  BIT(16)
  77
  78 #define CDNS_MCP_INTSTAT                        0x44
  79 #define CDNS_MCP_INTMASK                        0x48
  80
  81 #define CDNS_MCP_INT_IRQ                        BIT(31)
  82 #define CDNS_MCP_INT_RESERVED1                  GENMASK(30, 17)
  83 #define CDNS_MCP_INT_WAKEUP                     BIT(16)
  84 #define CDNS_MCP_INT_SLAVE_RSVD                 BIT(15)
  85 #define CDNS_MCP_INT_SLAVE_ALERT                BIT(14)
  86 #define CDNS_MCP_INT_SLAVE_ATTACH               BIT(13)
  87 #define CDNS_MCP_INT_SLAVE_NATTACH              BIT(12)
  88 #define CDNS_MCP_INT_SLAVE_MASK                 GENMASK(15, 12)
  89 #define CDNS_MCP_INT_DPINT                      BIT(11)
  90 #define CDNS_MCP_INT_CTRL_CLASH                 BIT(10)
  91 #define CDNS_MCP_INT_DATA_CLASH                 BIT(9)
  92 #define CDNS_MCP_INT_PARITY                     BIT(8)
  93 #define CDNS_MCP_INT_CMD_ERR                    BIT(7)
  94 #define CDNS_MCP_INT_RESERVED2                  GENMASK(6, 4)
  95 #define CDNS_MCP_INT_RX_NE                      BIT(3)
  96 #define CDNS_MCP_INT_RX_WL                      BIT(2)
  97 #define CDNS_MCP_INT_TXE                        BIT(1)
  98 #define CDNS_MCP_INT_TXF                        BIT(0)
  99 #define CDNS_MCP_INT_RESERVED (CDNS_MCP_INT_RESERVED1 | CDNS_MCP_INT_RESERVED2)
 100
 101 #define CDNS_MCP_INTSET                         0x4C
 102
 103 #define CDNS_MCP_SLAVE_STAT                     0x50
 104 #define CDNS_MCP_SLAVE_STAT_MASK                GENMASK(1, 0)
 105
 106 #define CDNS_MCP_SLAVE_INTSTAT0                 0x54
 107 #define CDNS_MCP_SLAVE_INTSTAT1                 0x58
 108 #define CDNS_MCP_SLAVE_INTSTAT_NPRESENT         BIT(0)
 109 #define CDNS_MCP_SLAVE_INTSTAT_ATTACHED         BIT(1)
 110 #define CDNS_MCP_SLAVE_INTSTAT_ALERT            BIT(2)
 111 #define CDNS_MCP_SLAVE_INTSTAT_RESERVED         BIT(3)
 112 #define CDNS_MCP_SLAVE_STATUS_BITS              GENMASK(3, 0)
 113 #define CDNS_MCP_SLAVE_STATUS_NUM               4
 114
 115 #define CDNS_MCP_SLAVE_INTMASK0                 0x5C
 116 #define CDNS_MCP_SLAVE_INTMASK1                 0x60
 117
 118 #define CDNS_MCP_SLAVE_INTMASK0_MASK            GENMASK(31, 0)
 119 #define CDNS_MCP_SLAVE_INTMASK1_MASK            GENMASK(15, 0)
 120
 121 #define CDNS_MCP_PORT_INTSTAT                   0x64
 122 #define CDNS_MCP_PDI_STAT                       0x6C
 123
 124 #define CDNS_MCP_FIFOLEVEL                      0x78
 125 #define CDNS_MCP_FIFOSTAT                       0x7C
 126 #define CDNS_MCP_RX_FIFO_AVAIL                  GENMASK(5, 0)
 127
 128 #define CDNS_MCP_CMD_BASE                       0x80
 129 #define CDNS_MCP_RESP_BASE                      0x80
 130 #define CDNS_MCP_CMD_LEN                        0x20
 131 #define CDNS_MCP_CMD_WORD_LEN                   0x4
 132
 133 #define CDNS_MCP_CMD_SSP_TAG                    BIT(31)
 134 #define CDNS_MCP_CMD_COMMAND                    GENMASK(30, 28)
 135 #define CDNS_MCP_CMD_DEV_ADDR                   GENMASK(27, 24)
 136 #define CDNS_MCP_CMD_REG_ADDR                   GENMASK(23, 8)
 137 #define CDNS_MCP_CMD_REG_DATA                   GENMASK(7, 0)
 138
 139 #define CDNS_MCP_CMD_READ                       2
 140 #define CDNS_MCP_CMD_WRITE                      3
 141
 142 #define CDNS_MCP_RESP_RDATA                     GENMASK(15, 8)
 143 #define CDNS_MCP_RESP_ACK                       BIT(0)
 144 #define CDNS_MCP_RESP_NACK                      BIT(1)
 145
 146 #define CDNS_DP_SIZE                            128
 147
 148 #define CDNS_DPN_B0_CONFIG(n)                   (0x100 + CDNS_DP_SIZE * (n))
 149 #define CDNS_DPN_B0_CH_EN(n)                    (0x104 + CDNS_DP_SIZE * (n))
 150 #define CDNS_DPN_B0_SAMPLE_CTRL(n)              (0x108 + CDNS_DP_SIZE * (n))
 151 #define CDNS_DPN_B0_OFFSET_CTRL(n)              (0x10C + CDNS_DP_SIZE * (n))
 152 #define CDNS_DPN_B0_HCTRL(n)                    (0x110 + CDNS_DP_SIZE * (n))
 153 #define CDNS_DPN_B0_ASYNC_CTRL(n)               (0x114 + CDNS_DP_SIZE * (n))
 154
 155 #define CDNS_DPN_B1_CONFIG(n)                   (0x118 + CDNS_DP_SIZE * (n))
 156 #define CDNS_DPN_B1_CH_EN(n)                    (0x11C + CDNS_DP_SIZE * (n))
 157 #define CDNS_DPN_B1_SAMPLE_CTRL(n)              (0x120 + CDNS_DP_SIZE * (n))
 158 #define CDNS_DPN_B1_OFFSET_CTRL(n)              (0x124 + CDNS_DP_SIZE * (n))
 159 #define CDNS_DPN_B1_HCTRL(n)                    (0x128 + CDNS_DP_SIZE * (n))
 160 #define CDNS_DPN_B1_ASYNC_CTRL(n)               (0x12C + CDNS_DP_SIZE * (n))
 161
 162 #define CDNS_DPN_CONFIG_BPM                     BIT(18)
 163 #define CDNS_DPN_CONFIG_BGC                     GENMASK(17, 16)
 164 #define CDNS_DPN_CONFIG_WL                      GENMASK(12, 8)
 165 #define CDNS_DPN_CONFIG_PORT_DAT                GENMASK(3, 2)
 166 #define CDNS_DPN_CONFIG_PORT_FLOW               GENMASK(1, 0)
 167
 168 #define CDNS_DPN_SAMPLE_CTRL_SI                 GENMASK(15, 0)
 169
 170 #define CDNS_DPN_OFFSET_CTRL_1                  GENMASK(7, 0)
 171 #define CDNS_DPN_OFFSET_CTRL_2                  GENMASK(15, 8)
 172
 173 #define CDNS_DPN_HCTRL_HSTOP                    GENMASK(3, 0)
 174 #define CDNS_DPN_HCTRL_HSTART                   GENMASK(7, 4)
 175 #define CDNS_DPN_HCTRL_LCTRL                    GENMASK(10, 8)
 176
 177 #define CDNS_PORTCTRL                           0x130
 178 #define CDNS_PORTCTRL_TEST_FAILED               BIT(1)
 179 #define CDNS_PORTCTRL_DIRN                      BIT(7)
 180 #define CDNS_PORTCTRL_BANK_INVERT               BIT(8)
 181
 182 #define CDNS_PORT_OFFSET                        0x80
 183
 184 #define CDNS_PDI_CONFIG(n)                      (0x1100 + (n) * 16)
 185
 186 #define CDNS_PDI_CONFIG_SOFT_RESET              BIT(24)
 187 #define CDNS_PDI_CONFIG_CHANNEL                 GENMASK(15, 8)
 188 #define CDNS_PDI_CONFIG_PORT                    GENMASK(4, 0)
 189
 190 /* Driver defaults */
 191 #define CDNS_TX_TIMEOUT                         2000
 192
 193 #define CDNS_SCP_RX_FIFOLEVEL                   0x2
 194
 195 /*
 196  * register accessor helpers
 197  */
 198 static inline u32 cdns_readl(struct sdw_cdns *cdns, int offset)
 199 {
 200         return readl(cdns->registers + offset);
 201 }
 202
 203 static inline void cdns_writel(struct sdw_cdns *cdns, int offset, u32 value)
 204 {
 205         writel(value, cdns->registers + offset);
 206 }
 207
 208 static inline void cdns_updatel(struct sdw_cdns *cdns,
 209                                 int offset, u32 mask, u32 val)
 210 {
 211         u32 tmp;
 212
 213         tmp = cdns_readl(cdns, offset);
 214         tmp = (tmp & ~mask) | val;
 215         cdns_writel(cdns, offset, tmp);
 216 }
 217
 218 static int cdns_set_wait(struct sdw_cdns *cdns, int offset, u32 mask, u32 value)
 219 {
 220         int timeout = 10;
 221         u32 reg_read;
 222
 223         /* Wait for bit to be set */
 224         do {
 225                 reg_read = readl(cdns->registers + offset);
 226                 if ((reg_read & mask) == value)
 227                         return 0;
 228
 229                 timeout--;
 230                 usleep_range(50, 100);
 231         } while (timeout != 0);
 232
 233         return -ETIMEDOUT;
 234 }
 235
 236 static int cdns_clear_bit(struct sdw_cdns *cdns, int offset, u32 value)
 237 {
 238         writel(value, cdns->registers + offset);
 239
 240         /* Wait for bit to be self cleared */
 241         return cdns_set_wait(cdns, offset, value, 0);
 242 }
 243
 244 /*
 245  * all changes to the MCP_CONFIG, MCP_CONTROL, MCP_CMDCTRL and MCP_PHYCTRL
 246  * need to be confirmed with a write to MCP_CONFIG_UPDATE
 247  */
 248 static int cdns_config_update(struct sdw_cdns *cdns)
 249 {
 250         int ret;
 251
 252         if (sdw_cdns_is_clock_stop(cdns)) {
 253                 dev_err(cdns->dev, "Cannot program MCP_CONFIG_UPDATE in ClockStopMode\n");
 254                 return -EINVAL;
 255         }
 256
 257         ret = cdns_clear_bit(cdns, CDNS_MCP_CONFIG_UPDATE,
 258                              CDNS_MCP_CONFIG_UPDATE_BIT);
 259         if (ret < 0)
 260                 dev_err(cdns->dev, "Config update timedout\n");
 261
 262         return ret;
 263 }
 264
 265 /*
 266  * debugfs
 267  */
 268 #ifdef CONFIG_DEBUG_FS
 269
 270 #define RD_BUF (2 * PAGE_SIZE)
 271
 272 static ssize_t cdns_sprintf(struct sdw_cdns *cdns,
 273                             char *buf, size_t pos, unsigned int reg)
 274 {
 275         return scnprintf(buf + pos, RD_BUF - pos,
 276                          "%4x\t%8x\n", reg, cdns_readl(cdns, reg));
 277 }
 278
 279 static int cdns_reg_show(struct seq_file *s, void *data)
 280 {
 281         struct sdw_cdns *cdns = s->private;
 282         char *buf;
 283         ssize_t ret;
 284         int num_ports;
 285         int i, j;
 286
 287         buf = kzalloc(RD_BUF, GFP_KERNEL);
 288         if (!buf)
 289                 return -ENOMEM;
 290
 291         ret = scnprintf(buf, RD_BUF, "Register  Value\n");
 292         ret += scnprintf(buf + ret, RD_BUF - ret, "\nMCP Registers\n");
 293         /* 8 MCP registers */
 294         for (i = CDNS_MCP_CONFIG; i <= CDNS_MCP_PHYCTRL; i += sizeof(u32))
 295                 ret += cdns_sprintf(cdns, buf, ret, i);
 296
 297         ret += scnprintf(buf + ret, RD_BUF - ret,
 298                          "\nStatus & Intr Registers\n");
 299         /* 13 Status & Intr registers (offsets 0x70 and 0x74 not defined) */
 300         for (i = CDNS_MCP_STAT; i <=  CDNS_MCP_FIFOSTAT; i += sizeof(u32))
 301                 ret += cdns_sprintf(cdns, buf, ret, i);
 302
 303         ret += scnprintf(buf + ret, RD_BUF - ret,
 304                          "\nSSP & Clk ctrl Registers\n");
 305         ret += cdns_sprintf(cdns, buf, ret, CDNS_MCP_SSP_CTRL0);
 306         ret += cdns_sprintf(cdns, buf, ret, CDNS_MCP_SSP_CTRL1);
 307         ret += cdns_sprintf(cdns, buf, ret, CDNS_MCP_CLK_CTRL0);
 308         ret += cdns_sprintf(cdns, buf, ret, CDNS_MCP_CLK_CTRL1);
 309
 310         ret += scnprintf(buf + ret, RD_BUF - ret,
 311                          "\nDPn B0 Registers\n");
 312
 313         num_ports = cdns->num_ports;
 314
 315         for (i = 0; i < num_ports; i++) {
 316                 ret += scnprintf(buf + ret, RD_BUF - ret,
 317                                  "\nDP-%d\n", i);
 318                 for (j = CDNS_DPN_B0_CONFIG(i);
 319                      j < CDNS_DPN_B0_ASYNC_CTRL(i); j += sizeof(u32))
 320                         ret += cdns_sprintf(cdns, buf, ret, j);
 321         }
 322
 323         ret += scnprintf(buf + ret, RD_BUF - ret,
 324                          "\nDPn B1 Registers\n");
 325         for (i = 0; i < num_ports; i++) {
 326                 ret += scnprintf(buf + ret, RD_BUF - ret,
 327                                  "\nDP-%d\n", i);
 328
 329                 for (j = CDNS_DPN_B1_CONFIG(i);
 330                      j < CDNS_DPN_B1_ASYNC_CTRL(i); j += sizeof(u32))
 331                         ret += cdns_sprintf(cdns, buf, ret, j);
 332         }
 333
 334         ret += scnprintf(buf + ret, RD_BUF - ret,
 335                          "\nDPn Control Registers\n");
 336         for (i = 0; i < num_ports; i++)
 337                 ret += cdns_sprintf(cdns, buf, ret,
 338                                 CDNS_PORTCTRL + i * CDNS_PORT_OFFSET);
 339
 340         ret += scnprintf(buf + ret, RD_BUF - ret,
 341                          "\nPDIn Config Registers\n");
 342
 343         /* number of PDI and ports is interchangeable */
 344         for (i = 0; i < num_ports; i++)
 345                 ret += cdns_sprintf(cdns, buf, ret, CDNS_PDI_CONFIG(i));
 346
 347         seq_printf(s, "%s", buf);
 348         kfree(buf);
 349
 350         return 0;
 351 }
 352 DEFINE_SHOW_ATTRIBUTE(cdns_reg);
 353
 354 static int cdns_hw_reset(void *data, u64 value)
 355 {
 356         struct sdw_cdns *cdns = data;
 357         int ret;
 358
 359         if (value != 1)
 360                 return -EINVAL;
 361
 362         /* Userspace changed the hardware state behind the kernel's back */
 363         add_taint(TAINT_USER, LOCKDEP_STILL_OK);
 364
 365         ret = sdw_cdns_exit_reset(cdns);
 366
 367         dev_dbg(cdns->dev, "link hw_reset done: %d\n", ret);
 368
 369         return ret;
 370 }
 371
 372 DEFINE_DEBUGFS_ATTRIBUTE(cdns_hw_reset_fops, NULL, cdns_hw_reset, "%llu\n");
 373
 374 static int cdns_parity_error_injection(void *data, u64 value)
 375 {
 376         struct sdw_cdns *cdns = data;
 377         struct sdw_bus *bus;
 378         int ret;
 379
 380         if (value != 1)
 381                 return -EINVAL;
 382
 383         bus = &cdns->bus;
 384
 385         /*
 386          * Resume Master device. If this results in a bus reset, the
 387          * Slave devices will re-attach and be re-enumerated.
 388          */
 389         ret = pm_runtime_get_sync(bus->dev);
 390         if (ret < 0 && ret != -EACCES) {
 391                 dev_err_ratelimited(cdns->dev,
 392                                     "pm_runtime_get_sync failed in %s, ret %d\n",
 393                                     __func__, ret);
 394                 pm_runtime_put_noidle(bus->dev);
 395                 return ret;
 396         }
 397
 398         /*
 399          * wait long enough for Slave(s) to be in steady state. This
 400          * does not need to be super precise.
 401          */
 402         msleep(200);
 403
 404         /*
 405          * Take the bus lock here to make sure that any bus transactions
 406          * will be queued while we inject a parity error on a dummy read
 407          */
 408         mutex_lock(&bus->bus_lock);
 409
 410         /* program hardware to inject parity error */
 411         cdns_updatel(cdns, CDNS_MCP_CMDCTRL,
 412                      CDNS_MCP_CMDCTRL_INSERT_PARITY_ERR,
 413                      CDNS_MCP_CMDCTRL_INSERT_PARITY_ERR);
 414
 415         /* commit changes */
 416         cdns_updatel(cdns, CDNS_MCP_CONFIG_UPDATE,
 417                      CDNS_MCP_CONFIG_UPDATE_BIT,
 418                      CDNS_MCP_CONFIG_UPDATE_BIT);
 419
 420         /* do a broadcast dummy read to avoid bus clashes */
 421         ret = sdw_bread_no_pm_unlocked(&cdns->bus, 0xf, SDW_SCP_DEVID_0);
 422         dev_info(cdns->dev, "parity error injection, read: %d\n", ret);
 423
 424         /* program hardware to disable parity error */
 425         cdns_updatel(cdns, CDNS_MCP_CMDCTRL,
 426                      CDNS_MCP_CMDCTRL_INSERT_PARITY_ERR,
 427                      0);
 428
 429         /* commit changes */
 430         cdns_updatel(cdns, CDNS_MCP_CONFIG_UPDATE,
 431                      CDNS_MCP_CONFIG_UPDATE_BIT,
 432                      CDNS_MCP_CONFIG_UPDATE_BIT);
 433
 434         /* Continue bus operation with parity error injection disabled */
 435         mutex_unlock(&bus->bus_lock);
 436
 437         /* Userspace changed the hardware state behind the kernel's back */
 438         add_taint(TAINT_USER, LOCKDEP_STILL_OK);
 439
 440         /*
 441          * allow Master device to enter pm_runtime suspend. This may
 442          * also result in Slave devices suspending.
 443          */
 444         pm_runtime_mark_last_busy(bus->dev);
 445         pm_runtime_put_autosuspend(bus->dev);
 446
 447         return 0;
 448 }
 449
 450 DEFINE_DEBUGFS_ATTRIBUTE(cdns_parity_error_fops, NULL,
 451                          cdns_parity_error_injection, "%llu\n");
 452
 453 /**
 454  * sdw_cdns_debugfs_init() - Cadence debugfs init
 455  * @cdns: Cadence instance
 456  * @root: debugfs root
 457  */
 458 void sdw_cdns_debugfs_init(struct sdw_cdns *cdns, struct dentry *root)
 459 {
 460         debugfs_create_file("cdns-registers", 0400, root, cdns, &cdns_reg_fops);
 461
 462         debugfs_create_file("cdns-hw-reset", 0200, root, cdns,
 463                             &cdns_hw_reset_fops);
 464
 465         debugfs_create_file("cdns-parity-error-injection", 0200, root, cdns,
 466                             &cdns_parity_error_fops);
 467 }
 468 EXPORT_SYMBOL_GPL(sdw_cdns_debugfs_init);
 469
 470 #endif /* CONFIG_DEBUG_FS */
 471
 472 /*
 473  * IO Calls
 474  */
 475 static enum sdw_command_response
 476 cdns_fill_msg_resp(struct sdw_cdns *cdns,
 477                    struct sdw_msg *msg, int count, int offset)
 478 {
 479         int nack = 0, no_ack = 0;
 480         int i;
 481
 482         /* check message response */
 483         for (i = 0; i < count; i++) {
 484                 if (!(cdns->response_buf[i] & CDNS_MCP_RESP_ACK)) {
 485                         no_ack = 1;
 486                         dev_dbg_ratelimited(cdns->dev, "Msg Ack not received\n");
 487                 }
 488                 if (cdns->response_buf[i] & CDNS_MCP_RESP_NACK) {
 489                         nack = 1;
 490                         dev_err_ratelimited(cdns->dev, "Msg NACK received\n");
 491                 }
 492         }
 493
 494         if (nack) {
 495                 dev_err_ratelimited(cdns->dev, "Msg NACKed for Slave %d\n", msg->dev_num);
 496                 return SDW_CMD_FAIL;
 497         }
 498
 499         if (no_ack) {
 500                 dev_dbg_ratelimited(cdns->dev, "Msg ignored for Slave %d\n", msg->dev_num);
 501                 return SDW_CMD_IGNORED;
 502         }
 503
 504         if (msg->flags == SDW_MSG_FLAG_READ) {
 505                 /* fill response */
 506                 for (i = 0; i < count; i++)
 507                         msg->buf[i + offset] = FIELD_GET(CDNS_MCP_RESP_RDATA,
 508                                                          cdns->response_buf[i]);
 509         }
 510
 511         return SDW_CMD_OK;
 512 }
 513
 514 static void cdns_read_response(struct sdw_cdns *cdns)
 515 {
 516         u32 num_resp, cmd_base;
 517         int i;
 518
 519         /* RX_FIFO_AVAIL can be 2 entries more than the FIFO size */
 520         BUILD_BUG_ON(ARRAY_SIZE(cdns->response_buf) < CDNS_MCP_CMD_LEN + 2);
 521
 522         num_resp = cdns_readl(cdns, CDNS_MCP_FIFOSTAT);
 523         num_resp &= CDNS_MCP_RX_FIFO_AVAIL;
 524         if (num_resp > ARRAY_SIZE(cdns->response_buf)) {
 525                 dev_warn(cdns->dev, "RX AVAIL %d too long\n", num_resp);
 526                 num_resp = ARRAY_SIZE(cdns->response_buf);
 527         }
 528
 529         cmd_base = CDNS_MCP_CMD_BASE;
 530
 531         for (i = 0; i < num_resp; i++) {
 532                 cdns->response_buf[i] = cdns_readl(cdns, cmd_base);
 533                 cmd_base += CDNS_MCP_CMD_WORD_LEN;
 534         }
 535 }
 536
 537 static enum sdw_command_response
 538 _cdns_xfer_msg(struct sdw_cdns *cdns, struct sdw_msg *msg, int cmd,
 539                int offset, int count, bool defer)
 540 {
 541         unsigned long time;
 542         u32 base, i, data;
 543         u16 addr;
 544
 545         /* Program the watermark level for RX FIFO */
 546         if (cdns->msg_count != count) {
 547                 cdns_writel(cdns, CDNS_MCP_FIFOLEVEL, count);
 548                 cdns->msg_count = count;
 549         }
 550
 551         base = CDNS_MCP_CMD_BASE;
 552         addr = msg->addr;
 553
 554         for (i = 0; i < count; i++) {
 555                 data = FIELD_PREP(CDNS_MCP_CMD_DEV_ADDR, msg->dev_num);
 556                 data |= FIELD_PREP(CDNS_MCP_CMD_COMMAND, cmd);
 557                 data |= FIELD_PREP(CDNS_MCP_CMD_REG_ADDR, addr);
 558                 addr++;
 559
 560                 if (msg->flags == SDW_MSG_FLAG_WRITE)
 561                         data |= msg->buf[i + offset];
 562
 563                 data |= FIELD_PREP(CDNS_MCP_CMD_SSP_TAG, msg->ssp_sync);
 564                 cdns_writel(cdns, base, data);
 565                 base += CDNS_MCP_CMD_WORD_LEN;
 566         }
 567
 568         if (defer)
 569                 return SDW_CMD_OK;
 570
 571         /* wait for timeout or response */
 572         time = wait_for_completion_timeout(&cdns->tx_complete,
 573                                            msecs_to_jiffies(CDNS_TX_TIMEOUT));
 574         if (!time) {
 575                 dev_err(cdns->dev, "IO transfer timed out, cmd %d device %d addr %x len %d\n",
 576                         cmd, msg->dev_num, msg->addr, msg->len);
 577                 msg->len = 0;
 578
 579                 /* Drain anything in the RX_FIFO */
 580                 cdns_read_response(cdns);
 581
 582                 return SDW_CMD_TIMEOUT;
 583         }
 584
 585         return cdns_fill_msg_resp(cdns, msg, count, offset);
 586 }
 587
 588 static enum sdw_command_response
 589 cdns_program_scp_addr(struct sdw_cdns *cdns, struct sdw_msg *msg)
 590 {
 591         int nack = 0, no_ack = 0;
 592         unsigned long time;
 593         u32 data[2], base;
 594         int i;
 595
 596         /* Program the watermark level for RX FIFO */
 597         if (cdns->msg_count != CDNS_SCP_RX_FIFOLEVEL) {
 598                 cdns_writel(cdns, CDNS_MCP_FIFOLEVEL, CDNS_SCP_RX_FIFOLEVEL);
 599                 cdns->msg_count = CDNS_SCP_RX_FIFOLEVEL;
 600         }
 601
 602         data[0] = FIELD_PREP(CDNS_MCP_CMD_DEV_ADDR, msg->dev_num);
 603         data[0] |= FIELD_PREP(CDNS_MCP_CMD_COMMAND, 0x3);
 604         data[1] = data[0];
 605
 606         data[0] |= FIELD_PREP(CDNS_MCP_CMD_REG_ADDR, SDW_SCP_ADDRPAGE1);
 607         data[1] |= FIELD_PREP(CDNS_MCP_CMD_REG_ADDR, SDW_SCP_ADDRPAGE2);
 608
 609         data[0] |= msg->addr_page1;
 610         data[1] |= msg->addr_page2;
 611
 612         base = CDNS_MCP_CMD_BASE;
 613         cdns_writel(cdns, base, data[0]);
 614         base += CDNS_MCP_CMD_WORD_LEN;
 615         cdns_writel(cdns, base, data[1]);
 616
 617         time = wait_for_completion_timeout(&cdns->tx_complete,
 618                                            msecs_to_jiffies(CDNS_TX_TIMEOUT));
 619         if (!time) {
 620                 dev_err(cdns->dev, "SCP Msg trf timed out\n");
 621                 msg->len = 0;
 622                 return SDW_CMD_TIMEOUT;
 623         }
 624
 625         /* check response the writes */
 626         for (i = 0; i < 2; i++) {
 627                 if (!(cdns->response_buf[i] & CDNS_MCP_RESP_ACK)) {
 628                         no_ack = 1;
 629                         dev_err(cdns->dev, "Program SCP Ack not received\n");
 630                         if (cdns->response_buf[i] & CDNS_MCP_RESP_NACK) {
 631                                 nack = 1;
 632                                 dev_err(cdns->dev, "Program SCP NACK received\n");
 633                         }
 634                 }
 635         }
 636
 637         /* For NACK, NO ack, don't return err if we are in Broadcast mode */
 638         if (nack) {
 639                 dev_err_ratelimited(cdns->dev,
 640                                     "SCP_addrpage NACKed for Slave %d\n", msg->dev_num);
 641                 return SDW_CMD_FAIL;
 642         }
 643
 644         if (no_ack) {
 645                 dev_dbg_ratelimited(cdns->dev,
 646                                     "SCP_addrpage ignored for Slave %d\n", msg->dev_num);
 647                 return SDW_CMD_IGNORED;
 648         }
 649
 650         return SDW_CMD_OK;
 651 }
 652
 653 static int cdns_prep_msg(struct sdw_cdns *cdns, struct sdw_msg *msg, int *cmd)
 654 {
 655         int ret;
 656
 657         if (msg->page) {
 658                 ret = cdns_program_scp_addr(cdns, msg);
 659                 if (ret) {
 660                         msg->len = 0;
 661                         return ret;
 662                 }
 663         }
 664
 665         switch (msg->flags) {
 666         case SDW_MSG_FLAG_READ:
 667                 *cmd = CDNS_MCP_CMD_READ;
 668                 break;
 669
 670         case SDW_MSG_FLAG_WRITE:
 671                 *cmd = CDNS_MCP_CMD_WRITE;
 672                 break;
 673
 674         default:
 675                 dev_err(cdns->dev, "Invalid msg cmd: %d\n", msg->flags);
 676                 return -EINVAL;
 677         }
 678
 679         return 0;
 680 }
 681
 682 enum sdw_command_response
 683 cdns_xfer_msg(struct sdw_bus *bus, struct sdw_msg *msg)
 684 {
 685         struct sdw_cdns *cdns = bus_to_cdns(bus);
 686         int cmd = 0, ret, i;
 687
 688         ret = cdns_prep_msg(cdns, msg, &cmd);
 689         if (ret)
 690                 return SDW_CMD_FAIL_OTHER;
 691
 692         for (i = 0; i < msg->len / CDNS_MCP_CMD_LEN; i++) {
 693                 ret = _cdns_xfer_msg(cdns, msg, cmd, i * CDNS_MCP_CMD_LEN,
 694                                      CDNS_MCP_CMD_LEN, false);
 695                 if (ret < 0)
 696                         goto exit;
 697         }
 698
 699         if (!(msg->len % CDNS_MCP_CMD_LEN))
 700                 goto exit;
 701
 702         ret = _cdns_xfer_msg(cdns, msg, cmd, i * CDNS_MCP_CMD_LEN,
 703                              msg->len % CDNS_MCP_CMD_LEN, false);
 704
 705 exit:
 706         return ret;
 707 }
 708 EXPORT_SYMBOL(cdns_xfer_msg);
 709
 710 enum sdw_command_response
 711 cdns_xfer_msg_defer(struct sdw_bus *bus,
 712                     struct sdw_msg *msg, struct sdw_defer *defer)
 713 {
 714         struct sdw_cdns *cdns = bus_to_cdns(bus);
 715         int cmd = 0, ret;
 716
 717         /* for defer only 1 message is supported */
 718         if (msg->len > 1)
 719                 return -ENOTSUPP;
 720
 721         ret = cdns_prep_msg(cdns, msg, &cmd);
 722         if (ret)
 723                 return SDW_CMD_FAIL_OTHER;
 724
 725         cdns->defer = defer;
 726         cdns->defer->length = msg->len;
 727
 728         return _cdns_xfer_msg(cdns, msg, cmd, 0, msg->len, true);
 729 }
 730 EXPORT_SYMBOL(cdns_xfer_msg_defer);
 731
 732 enum sdw_command_response
 733 cdns_reset_page_addr(struct sdw_bus *bus, unsigned int dev_num)
 734 {
 735         struct sdw_cdns *cdns = bus_to_cdns(bus);
 736         struct sdw_msg msg;
 737
 738         /* Create dummy message with valid device number */
 739         memset(&msg, 0, sizeof(msg));
 740         msg.dev_num = dev_num;
 741
 742         return cdns_program_scp_addr(cdns, &msg);
 743 }
 744 EXPORT_SYMBOL(cdns_reset_page_addr);
 745
 746 /*
 747  * IRQ handling
 748  */
 749
 750 static int cdns_update_slave_status(struct sdw_cdns *cdns,
 751                                     u32 slave0, u32 slave1)
 752 {
 753         enum sdw_slave_status status[SDW_MAX_DEVICES + 1];
 754         bool is_slave = false;
 755         u64 slave;
 756         u32 mask;
 757         int i, set_status;
 758
 759         /* combine the two status */
 760         slave = ((u64)slave1 << 32) | slave0;
 761         memset(status, 0, sizeof(status));
 762
 763         for (i = 0; i <= SDW_MAX_DEVICES; i++) {
 764                 mask = (slave >> (i * CDNS_MCP_SLAVE_STATUS_NUM)) &
 765                                 CDNS_MCP_SLAVE_STATUS_BITS;
 766                 if (!mask)
 767                         continue;
 768
 769                 is_slave = true;
 770                 set_status = 0;
 771
 772                 if (mask & CDNS_MCP_SLAVE_INTSTAT_RESERVED) {
 773                         status[i] = SDW_SLAVE_RESERVED;
 774                         set_status++;
 775                 }
 776
 777                 if (mask & CDNS_MCP_SLAVE_INTSTAT_ATTACHED) {
 778                         status[i] = SDW_SLAVE_ATTACHED;
 779                         set_status++;
 780                 }
 781
 782                 if (mask & CDNS_MCP_SLAVE_INTSTAT_ALERT) {
 783                         status[i] = SDW_SLAVE_ALERT;
 784                         set_status++;
 785                 }
 786
 787                 if (mask & CDNS_MCP_SLAVE_INTSTAT_NPRESENT) {
 788                         status[i] = SDW_SLAVE_UNATTACHED;
 789                         set_status++;
 790                 }
 791
 792                 /* first check if Slave reported multiple status */
 793                 if (set_status > 1) {
 794                         u32 val;
 795
 796                         dev_warn_ratelimited(cdns->dev,
 797                                              "Slave %d reported multiple Status: %d\n",
 798                                              i, mask);
 799
 800                         /* check latest status extracted from PING commands */
 801                         val = cdns_readl(cdns, CDNS_MCP_SLAVE_STAT);
 802                         val >>= (i * 2);
 803
 804                         switch (val & 0x3) {
 805                         case 0:
 806                                 status[i] = SDW_SLAVE_UNATTACHED;
 807                                 break;
 808                         case 1:
 809                                 status[i] = SDW_SLAVE_ATTACHED;
 810                                 break;
 811                         case 2:
 812                                 status[i] = SDW_SLAVE_ALERT;
 813                                 break;
 814                         case 3:
 815                         default:
 816                                 status[i] = SDW_SLAVE_RESERVED;
 817                                 break;
 818                         }
 819
 820                         dev_warn_ratelimited(cdns->dev,
 821                                              "Slave %d status updated to %d\n",
 822                                              i, status[i]);
 823
 824                 }
 825         }
 826
 827         if (is_slave)
 828                 return sdw_handle_slave_status(&cdns->bus, status);
 829
 830         return 0;
 831 }
 832
 833 /**
 834  * sdw_cdns_irq() - Cadence interrupt handler
 835  * @irq: irq number
 836  * @dev_id: irq context
 837  */
 838 irqreturn_t sdw_cdns_irq(int irq, void *dev_id)
 839 {
 840         struct sdw_cdns *cdns = dev_id;
 841         u32 int_status;
 842         int ret = IRQ_HANDLED;
 843
 844         /* Check if the link is up */
 845         if (!cdns->link_up)
 846                 return IRQ_NONE;
 847
 848         int_status = cdns_readl(cdns, CDNS_MCP_INTSTAT);
 849
 850         /* check for reserved values read as zero */
 851         if (int_status & CDNS_MCP_INT_RESERVED)
 852                 return IRQ_NONE;
 853
 854         if (!(int_status & CDNS_MCP_INT_IRQ))
 855                 return IRQ_NONE;
 856
 857         if (int_status & CDNS_MCP_INT_RX_WL) {
 858                 cdns_read_response(cdns);
 859
 860                 if (cdns->defer) {
 861                         cdns_fill_msg_resp(cdns, cdns->defer->msg,
 862                                            cdns->defer->length, 0);
 863                         complete(&cdns->defer->complete);
 864                         cdns->defer = NULL;
 865                 } else {
 866                         complete(&cdns->tx_complete);
 867                 }
 868         }
 869
 870         if (int_status & CDNS_MCP_INT_PARITY) {
 871                 /* Parity error detected by Master */
 872                 dev_err_ratelimited(cdns->dev, "Parity error\n");
 873         }
 874
 875         if (int_status & CDNS_MCP_INT_CTRL_CLASH) {
 876                 /* Slave is driving bit slot during control word */
 877                 dev_err_ratelimited(cdns->dev, "Bus clash for control word\n");
 878         }
 879
 880         if (int_status & CDNS_MCP_INT_DATA_CLASH) {
 881                 /*
 882                  * Multiple slaves trying to drive bit slot, or issue with
 883                  * ownership of data bits or Slave gone bonkers
 884                  */
 885                 dev_err_ratelimited(cdns->dev, "Bus clash for data word\n");
 886         }
 887
 888         if (cdns->bus.params.m_data_mode != SDW_PORT_DATA_MODE_NORMAL &&
 889             int_status & CDNS_MCP_INT_DPINT) {
 890                 u32 port_intstat;
 891
 892                 /* just log which ports report an error */
 893                 port_intstat = cdns_readl(cdns, CDNS_MCP_PORT_INTSTAT);
 894                 dev_err_ratelimited(cdns->dev, "DP interrupt: PortIntStat %8x\n",
 895                                     port_intstat);
 896
 897                 /* clear status w/ write1 */
 898                 cdns_writel(cdns, CDNS_MCP_PORT_INTSTAT, port_intstat);
 899         }
 900
 901         if (int_status & CDNS_MCP_INT_SLAVE_MASK) {
 902                 /* Mask the Slave interrupt and wake thread */
 903                 cdns_updatel(cdns, CDNS_MCP_INTMASK,
 904                              CDNS_MCP_INT_SLAVE_MASK, 0);
 905
 906                 int_status &= ~CDNS_MCP_INT_SLAVE_MASK;
 907
 908                 /*
 909                  * Deal with possible race condition between interrupt
 910                  * handling and disabling interrupts on suspend.
 911                  *
 912                  * If the master is in the process of disabling
 913                  * interrupts, don't schedule a workqueue
 914                  */
 915                 if (cdns->interrupt_enabled)
 916                         schedule_work(&cdns->work);
 917         }
 918
 919         cdns_writel(cdns, CDNS_MCP_INTSTAT, int_status);
 920         return ret;
 921 }
 922 EXPORT_SYMBOL(sdw_cdns_irq);
 923
 924 /**
 925  * To update slave status in a work since we will need to handle
 926  * other interrupts eg. CDNS_MCP_INT_RX_WL during the update slave
 927  * process.
 928  * @work: cdns worker thread
 929  */
 930 static void cdns_update_slave_status_work(struct work_struct *work)
 931 {
 932         struct sdw_cdns *cdns =
 933                 container_of(work, struct sdw_cdns, work);
 934         u32 slave0, slave1;
 935
 936         dev_dbg_ratelimited(cdns->dev, "Slave status change\n");
 937
 938         slave0 = cdns_readl(cdns, CDNS_MCP_SLAVE_INTSTAT0);
 939         slave1 = cdns_readl(cdns, CDNS_MCP_SLAVE_INTSTAT1);
 940
 941         cdns_update_slave_status(cdns, slave0, slave1);
 942         cdns_writel(cdns, CDNS_MCP_SLAVE_INTSTAT0, slave0);
 943         cdns_writel(cdns, CDNS_MCP_SLAVE_INTSTAT1, slave1);
 944
 945         /* clear and unmask Slave interrupt now */
 946         cdns_writel(cdns, CDNS_MCP_INTSTAT, CDNS_MCP_INT_SLAVE_MASK);
 947         cdns_updatel(cdns, CDNS_MCP_INTMASK,
 948                      CDNS_MCP_INT_SLAVE_MASK, CDNS_MCP_INT_SLAVE_MASK);
 949
 950 }
 951
 952 /*
 953  * init routines
 954  */
 955
 956 /**
 957  * sdw_cdns_exit_reset() - Program reset parameters and start bus operations
 958  * @cdns: Cadence instance
 959  */
 960 int sdw_cdns_exit_reset(struct sdw_cdns *cdns)
 961 {
 962         /* program maximum length reset to be safe */
 963         cdns_updatel(cdns, CDNS_MCP_CONTROL,
 964                      CDNS_MCP_CONTROL_RST_DELAY,
 965                      CDNS_MCP_CONTROL_RST_DELAY);
 966
 967         /* use hardware generated reset */
 968         cdns_updatel(cdns, CDNS_MCP_CONTROL,
 969                      CDNS_MCP_CONTROL_HW_RST,
 970                      CDNS_MCP_CONTROL_HW_RST);
 971
 972         /* commit changes */
 973         cdns_updatel(cdns, CDNS_MCP_CONFIG_UPDATE,
 974                      CDNS_MCP_CONFIG_UPDATE_BIT,
 975                      CDNS_MCP_CONFIG_UPDATE_BIT);
 976
 977         /* don't wait here */
 978         return 0;
 979
 980 }
 981 EXPORT_SYMBOL(sdw_cdns_exit_reset);
 982
 983 /**
 984  * sdw_cdns_enable_slave_interrupt() - Enable SDW slave interrupts
 985  * @cdns: Cadence instance
 986  * @state: boolean for true/false
 987  */
 988 static void cdns_enable_slave_interrupts(struct sdw_cdns *cdns, bool state)
 989 {
 990         u32 mask;
 991
 992         mask = cdns_readl(cdns, CDNS_MCP_INTMASK);
 993         if (state)
 994                 mask |= CDNS_MCP_INT_SLAVE_MASK;
 995         else
 996                 mask &= ~CDNS_MCP_INT_SLAVE_MASK;
 997
 998         cdns_writel(cdns, CDNS_MCP_INTMASK, mask);
 999 }
1000
1001 /**
1002  * sdw_cdns_enable_interrupt() - Enable SDW interrupts
1003  * @cdns: Cadence instance
1004  * @state: True if we are trying to enable interrupt.
1005  */
1006 int sdw_cdns_enable_interrupt(struct sdw_cdns *cdns, bool state)
1007 {
1008         u32 slave_intmask0 = 0;
1009         u32 slave_intmask1 = 0;
1010         u32 mask = 0;
1011
1012         if (!state)
1013                 goto update_masks;
1014
1015         slave_intmask0 = CDNS_MCP_SLAVE_INTMASK0_MASK;
1016         slave_intmask1 = CDNS_MCP_SLAVE_INTMASK1_MASK;
1017
1018         /* enable detection of all slave state changes */
1019         mask = CDNS_MCP_INT_SLAVE_MASK;
1020
1021         /* enable detection of bus issues */
1022         mask |= CDNS_MCP_INT_CTRL_CLASH | CDNS_MCP_INT_DATA_CLASH |
1023                 CDNS_MCP_INT_PARITY;
1024
1025         /* port interrupt limited to test modes for now */
1026         if (cdns->bus.params.m_data_mode != SDW_PORT_DATA_MODE_NORMAL)
1027                 mask |= CDNS_MCP_INT_DPINT;
1028
1029         /* enable detection of RX fifo level */
1030         mask |= CDNS_MCP_INT_RX_WL;
1031
1032         /*
1033          * CDNS_MCP_INT_IRQ needs to be set otherwise all previous
1034          * settings are irrelevant
1035          */
1036         mask |= CDNS_MCP_INT_IRQ;
1037
1038         if (interrupt_mask) /* parameter override */
1039                 mask = interrupt_mask;
1040
1041 update_masks:
1042         /* clear slave interrupt status before enabling interrupt */
1043         if (state) {
1044                 u32 slave_state;
1045
1046                 slave_state = cdns_readl(cdns, CDNS_MCP_SLAVE_INTSTAT0);
1047                 cdns_writel(cdns, CDNS_MCP_SLAVE_INTSTAT0, slave_state);
1048                 slave_state = cdns_readl(cdns, CDNS_MCP_SLAVE_INTSTAT1);
1049                 cdns_writel(cdns, CDNS_MCP_SLAVE_INTSTAT1, slave_state);
1050         }
1051         cdns->interrupt_enabled = state;
1052
1053         /*
1054          * Complete any on-going status updates before updating masks,
1055          * and cancel queued status updates.
1056          *
1057          * There could be a race with a new interrupt thrown before
1058          * the 3 mask updates below are complete, so in the interrupt
1059          * we use the 'interrupt_enabled' status to prevent new work
1060          * from being queued.
1061          */
1062         if (!state)
1063                 cancel_work_sync(&cdns->work);
1064
1065         cdns_writel(cdns, CDNS_MCP_SLAVE_INTMASK0, slave_intmask0);
1066         cdns_writel(cdns, CDNS_MCP_SLAVE_INTMASK1, slave_intmask1);
1067         cdns_writel(cdns, CDNS_MCP_INTMASK, mask);
1068
1069         return 0;
1070 }
1071 EXPORT_SYMBOL(sdw_cdns_enable_interrupt);
1072
1073 static int cdns_allocate_pdi(struct sdw_cdns *cdns,
1074                              struct sdw_cdns_pdi **stream,
1075                              u32 num, u32 pdi_offset)
1076 {
1077         struct sdw_cdns_pdi *pdi;
1078         int i;
1079
1080         if (!num)
1081                 return 0;
1082
1083         pdi = devm_kcalloc(cdns->dev, num, sizeof(*pdi), GFP_KERNEL);
1084         if (!pdi)
1085                 return -ENOMEM;
1086
1087         for (i = 0; i < num; i++) {
1088                 pdi[i].num = i + pdi_offset;
1089         }
1090
1091         *stream = pdi;
1092         return 0;
1093 }
1094
1095 /**
1096  * sdw_cdns_pdi_init() - PDI initialization routine
1097  *
1098  * @cdns: Cadence instance
1099  * @config: Stream configurations
1100  */
1101 int sdw_cdns_pdi_init(struct sdw_cdns *cdns,
1102                       struct sdw_cdns_stream_config config)
1103 {
1104         struct sdw_cdns_streams *stream;
1105         int offset;
1106         int ret;
1107
1108         cdns->pcm.num_bd = config.pcm_bd;
1109         cdns->pcm.num_in = config.pcm_in;
1110         cdns->pcm.num_out = config.pcm_out;
1111         cdns->pdm.num_bd = config.pdm_bd;
1112         cdns->pdm.num_in = config.pdm_in;
1113         cdns->pdm.num_out = config.pdm_out;
1114
1115         /* Allocate PDIs for PCMs */
1116         stream = &cdns->pcm;
1117
1118         /* we allocate PDI0 and PDI1 which are used for Bulk */
1119         offset = 0;
1120
1121         ret = cdns_allocate_pdi(cdns, &stream->bd,
1122                                 stream->num_bd, offset);
1123         if (ret)
1124                 return ret;
1125
1126         offset += stream->num_bd;
1127
1128         ret = cdns_allocate_pdi(cdns, &stream->in,
1129                                 stream->num_in, offset);
1130         if (ret)
1131                 return ret;
1132
1133         offset += stream->num_in;
1134
1135         ret = cdns_allocate_pdi(cdns, &stream->out,
1136                                 stream->num_out, offset);
1137         if (ret)
1138                 return ret;
1139
1140         /* Update total number of PCM PDIs */
1141         stream->num_pdi = stream->num_bd + stream->num_in + stream->num_out;
1142         cdns->num_ports = stream->num_pdi;
1143
1144         /* Allocate PDIs for PDMs */
1145         stream = &cdns->pdm;
1146         ret = cdns_allocate_pdi(cdns, &stream->bd,
1147                                 stream->num_bd, offset);
1148         if (ret)
1149                 return ret;
1150
1151         offset += stream->num_bd;
1152
1153         ret = cdns_allocate_pdi(cdns, &stream->in,
1154                                 stream->num_in, offset);
1155         if (ret)
1156                 return ret;
1157
1158         offset += stream->num_in;
1159
1160         ret = cdns_allocate_pdi(cdns, &stream->out,
1161                                 stream->num_out, offset);
1162
1163         if (ret)
1164                 return ret;
1165
1166         /* Update total number of PDM PDIs */
1167         stream->num_pdi = stream->num_bd + stream->num_in + stream->num_out;
1168         cdns->num_ports += stream->num_pdi;
1169
1170         return 0;
1171 }
1172 EXPORT_SYMBOL(sdw_cdns_pdi_init);
1173
1174 static u32 cdns_set_initial_frame_shape(int n_rows, int n_cols)
1175 {
1176         u32 val;
1177         int c;
1178         int r;
1179
1180         r = sdw_find_row_index(n_rows);
1181         c = sdw_find_col_index(n_cols);
1182
1183         val = FIELD_PREP(CDNS_MCP_FRAME_SHAPE_ROW_MASK, r);
1184         val |= FIELD_PREP(CDNS_MCP_FRAME_SHAPE_COL_MASK, c);
1185
1186         return val;
1187 }
1188
1189 static void cdns_init_clock_ctrl(struct sdw_cdns *cdns)
1190 {
1191         struct sdw_bus *bus = &cdns->bus;
1192         struct sdw_master_prop *prop = &bus->prop;
1193         u32 val;
1194         u32 ssp_interval;
1195         int divider;
1196
1197         /* Set clock divider */
1198         divider = (prop->mclk_freq / prop->max_clk_freq) - 1;
1199
1200         cdns_updatel(cdns, CDNS_MCP_CLK_CTRL0,
1201                      CDNS_MCP_CLK_MCLKD_MASK, divider);
1202         cdns_updatel(cdns, CDNS_MCP_CLK_CTRL1,
1203                      CDNS_MCP_CLK_MCLKD_MASK, divider);
1204
1205         /*
1206          * Frame shape changes after initialization have to be done
1207          * with the bank switch mechanism
1208          */
1209         val = cdns_set_initial_frame_shape(prop->default_row,
1210                                            prop->default_col);
1211         cdns_writel(cdns, CDNS_MCP_FRAME_SHAPE_INIT, val);
1212
1213         /* Set SSP interval to default value */
1214         ssp_interval = prop->default_frame_rate / SDW_CADENCE_GSYNC_HZ;
1215         cdns_writel(cdns, CDNS_MCP_SSP_CTRL0, ssp_interval);
1216         cdns_writel(cdns, CDNS_MCP_SSP_CTRL1, ssp_interval);
1217 }
1218
1219 /**
1220  * sdw_cdns_init() - Cadence initialization
1221  * @cdns: Cadence instance
1222  */
1223 int sdw_cdns_init(struct sdw_cdns *cdns)
1224 {
1225         u32 val;
1226
1227         cdns_init_clock_ctrl(cdns);
1228
1229         /* reset msg_count to default value of FIFOLEVEL */
1230         cdns->msg_count = cdns_readl(cdns, CDNS_MCP_FIFOLEVEL);
1231
1232         /* flush command FIFOs */
1233         cdns_updatel(cdns, CDNS_MCP_CONTROL, CDNS_MCP_CONTROL_CMD_RST,
1234                      CDNS_MCP_CONTROL_CMD_RST);
1235
1236         /* Set cmd accept mode */
1237         cdns_updatel(cdns, CDNS_MCP_CONTROL, CDNS_MCP_CONTROL_CMD_ACCEPT,
1238                      CDNS_MCP_CONTROL_CMD_ACCEPT);
1239
1240         /* Configure mcp config */
1241         val = cdns_readl(cdns, CDNS_MCP_CONFIG);
1242
1243         /* enable bus operations with clock and data */
1244         val &= ~CDNS_MCP_CONFIG_OP;
1245         val |= CDNS_MCP_CONFIG_OP_NORMAL;
1246
1247         /* Set cmd mode for Tx and Rx cmds */
1248         val &= ~CDNS_MCP_CONFIG_CMD;
1249
1250         /* Disable sniffer mode */
1251         val &= ~CDNS_MCP_CONFIG_SNIFFER;
1252
1253         /* Disable auto bus release */
1254         val &= ~CDNS_MCP_CONFIG_BUS_REL;
1255
1256         if (cdns->bus.multi_link)
1257                 /* Set Multi-master mode to take gsync into account */
1258                 val |= CDNS_MCP_CONFIG_MMASTER;
1259
1260         /* leave frame delay to hardware default of 0x1F */
1261
1262         /* leave command retry to hardware default of 0 */
1263
1264         cdns_writel(cdns, CDNS_MCP_CONFIG, val);
1265
1266         /* changes will be committed later */
1267         return 0;
1268 }
1269 EXPORT_SYMBOL(sdw_cdns_init);
1270
1271 int cdns_bus_conf(struct sdw_bus *bus, struct sdw_bus_params *params)
1272 {
1273         struct sdw_master_prop *prop = &bus->prop;
1274         struct sdw_cdns *cdns = bus_to_cdns(bus);
1275         int mcp_clkctrl_off;
1276         int divider;
1277
1278         if (!params->curr_dr_freq) {
1279                 dev_err(cdns->dev, "NULL curr_dr_freq\n");
1280                 return -EINVAL;
1281         }
1282
1283         divider = prop->mclk_freq * SDW_DOUBLE_RATE_FACTOR /
1284                 params->curr_dr_freq;
1285         divider--; /* divider is 1/(N+1) */
1286
1287         if (params->next_bank)
1288                 mcp_clkctrl_off = CDNS_MCP_CLK_CTRL1;
1289         else
1290                 mcp_clkctrl_off = CDNS_MCP_CLK_CTRL0;
1291
1292         cdns_updatel(cdns, mcp_clkctrl_off, CDNS_MCP_CLK_MCLKD_MASK, divider);
1293
1294         return 0;
1295 }
1296 EXPORT_SYMBOL(cdns_bus_conf);
1297
1298 static int cdns_port_params(struct sdw_bus *bus,
1299                             struct sdw_port_params *p_params, unsigned int bank)
1300 {
1301         struct sdw_cdns *cdns = bus_to_cdns(bus);
1302         int dpn_config = 0, dpn_config_off;
1303
1304         if (bank)
1305                 dpn_config_off = CDNS_DPN_B1_CONFIG(p_params->num);
1306         else
1307                 dpn_config_off = CDNS_DPN_B0_CONFIG(p_params->num);
1308
1309         dpn_config = cdns_readl(cdns, dpn_config_off);
1310
1311         u32p_replace_bits(&dpn_config, (p_params->bps - 1), CDNS_DPN_CONFIG_WL);
1312         u32p_replace_bits(&dpn_config, p_params->flow_mode, CDNS_DPN_CONFIG_PORT_FLOW);
1313         u32p_replace_bits(&dpn_config, p_params->data_mode, CDNS_DPN_CONFIG_PORT_DAT);
1314
1315         cdns_writel(cdns, dpn_config_off, dpn_config);
1316
1317         return 0;
1318 }
1319
1320 static int cdns_transport_params(struct sdw_bus *bus,
1321                                  struct sdw_transport_params *t_params,
1322                                  enum sdw_reg_bank bank)
1323 {
1324         struct sdw_cdns *cdns = bus_to_cdns(bus);
1325         int dpn_offsetctrl = 0, dpn_offsetctrl_off;
1326         int dpn_config = 0, dpn_config_off;
1327         int dpn_hctrl = 0, dpn_hctrl_off;
1328         int num = t_params->port_num;
1329         int dpn_samplectrl_off;
1330
1331         /*
1332          * Note: Only full data port is supported on the Master side for
1333          * both PCM and PDM ports.
1334          */
1335
1336         if (bank) {
1337                 dpn_config_off = CDNS_DPN_B1_CONFIG(num);
1338                 dpn_samplectrl_off = CDNS_DPN_B1_SAMPLE_CTRL(num);
1339                 dpn_hctrl_off = CDNS_DPN_B1_HCTRL(num);
1340                 dpn_offsetctrl_off = CDNS_DPN_B1_OFFSET_CTRL(num);
1341         } else {
1342                 dpn_config_off = CDNS_DPN_B0_CONFIG(num);
1343                 dpn_samplectrl_off = CDNS_DPN_B0_SAMPLE_CTRL(num);
1344                 dpn_hctrl_off = CDNS_DPN_B0_HCTRL(num);
1345                 dpn_offsetctrl_off = CDNS_DPN_B0_OFFSET_CTRL(num);
1346         }
1347
1348         dpn_config = cdns_readl(cdns, dpn_config_off);
1349         u32p_replace_bits(&dpn_config, t_params->blk_grp_ctrl, CDNS_DPN_CONFIG_BGC);
1350         u32p_replace_bits(&dpn_config, t_params->blk_pkg_mode, CDNS_DPN_CONFIG_BPM);
1351         cdns_writel(cdns, dpn_config_off, dpn_config);
1352
1353         u32p_replace_bits(&dpn_offsetctrl, t_params->offset1, CDNS_DPN_OFFSET_CTRL_1);
1354         u32p_replace_bits(&dpn_offsetctrl, t_params->offset2, CDNS_DPN_OFFSET_CTRL_2);
1355         cdns_writel(cdns, dpn_offsetctrl_off,  dpn_offsetctrl);
1356
1357         u32p_replace_bits(&dpn_hctrl, t_params->hstart, CDNS_DPN_HCTRL_HSTART);
1358         u32p_replace_bits(&dpn_hctrl, t_params->hstop, CDNS_DPN_HCTRL_HSTOP);
1359         u32p_replace_bits(&dpn_hctrl, t_params->lane_ctrl, CDNS_DPN_HCTRL_LCTRL);
1360
1361         cdns_writel(cdns, dpn_hctrl_off, dpn_hctrl);
1362         cdns_writel(cdns, dpn_samplectrl_off, (t_params->sample_interval - 1));
1363
1364         return 0;
1365 }
1366
1367 static int cdns_port_enable(struct sdw_bus *bus,
1368                             struct sdw_enable_ch *enable_ch, unsigned int bank)
1369 {
1370         struct sdw_cdns *cdns = bus_to_cdns(bus);
1371         int dpn_chnen_off, ch_mask;
1372
1373         if (bank)
1374                 dpn_chnen_off = CDNS_DPN_B1_CH_EN(enable_ch->port_num);
1375         else
1376                 dpn_chnen_off = CDNS_DPN_B0_CH_EN(enable_ch->port_num);
1377
1378         ch_mask = enable_ch->ch_mask * enable_ch->enable;
1379         cdns_writel(cdns, dpn_chnen_off, ch_mask);
1380
1381         return 0;
1382 }
1383
1384 static const struct sdw_master_port_ops cdns_port_ops = {
1385         .dpn_set_port_params = cdns_port_params,
1386         .dpn_set_port_transport_params = cdns_transport_params,
1387         .dpn_port_enable_ch = cdns_port_enable,
1388 };
1389
1390 /**
1391  * sdw_cdns_is_clock_stop: Check clock status
1392  *
1393  * @cdns: Cadence instance
1394  */
1395 bool sdw_cdns_is_clock_stop(struct sdw_cdns *cdns)
1396 {
1397         return !!(cdns_readl(cdns, CDNS_MCP_STAT) & CDNS_MCP_STAT_CLK_STOP);
1398 }
1399 EXPORT_SYMBOL(sdw_cdns_is_clock_stop);
1400
1401 /**
1402  * sdw_cdns_clock_stop: Cadence clock stop configuration routine
1403  *
1404  * @cdns: Cadence instance
1405  * @block_wake: prevent wakes if required by the platform
1406  */
1407 int sdw_cdns_clock_stop(struct sdw_cdns *cdns, bool block_wake)
1408 {
1409         bool slave_present = false;
1410         struct sdw_slave *slave;
1411         int ret;
1412
1413         /* Check suspend status */
1414         if (sdw_cdns_is_clock_stop(cdns)) {
1415                 dev_dbg(cdns->dev, "Clock is already stopped\n");
1416                 return 0;
1417         }
1418
1419         /*
1420          * Before entering clock stop we mask the Slave
1421          * interrupts. This helps avoid having to deal with e.g. a
1422          * Slave becoming UNATTACHED while the clock is being stopped
1423          */
1424         cdns_enable_slave_interrupts(cdns, false);
1425
1426         /*
1427          * For specific platforms, it is required to be able to put
1428          * master into a state in which it ignores wake-up trials
1429          * in clock stop state
1430          */
1431         if (block_wake)
1432                 cdns_updatel(cdns, CDNS_MCP_CONTROL,
1433                              CDNS_MCP_CONTROL_BLOCK_WAKEUP,
1434                              CDNS_MCP_CONTROL_BLOCK_WAKEUP);
1435
1436         list_for_each_entry(slave, &cdns->bus.slaves, node) {
1437                 if (slave->status == SDW_SLAVE_ATTACHED ||
1438                     slave->status == SDW_SLAVE_ALERT) {
1439                         slave_present = true;
1440                         break;
1441                 }
1442         }
1443
1444         /*
1445          * This CMD_ACCEPT should be used when there are no devices
1446          * attached on the link when entering clock stop mode. If this is
1447          * not set and there is a broadcast write then the command ignored
1448          * will be treated as a failure
1449          */
1450         if (!slave_present)
1451                 cdns_updatel(cdns, CDNS_MCP_CONTROL,
1452                              CDNS_MCP_CONTROL_CMD_ACCEPT,
1453                              CDNS_MCP_CONTROL_CMD_ACCEPT);
1454         else
1455                 cdns_updatel(cdns, CDNS_MCP_CONTROL,
1456                              CDNS_MCP_CONTROL_CMD_ACCEPT, 0);
1457
1458         /* commit changes */
1459         ret = cdns_config_update(cdns);
1460         if (ret < 0) {
1461                 dev_err(cdns->dev, "%s: config_update failed\n", __func__);
1462                 return ret;
1463         }
1464
1465         /* Prepare slaves for clock stop */
1466         if (slave_present) {
1467                 ret = sdw_bus_prep_clk_stop(&cdns->bus);
1468                 if (ret < 0 && ret != -ENODATA) {
1469                         dev_err(cdns->dev, "prepare clock stop failed %d\n", ret);
1470                         return ret;
1471                 }
1472         }
1473
1474         /*
1475          * Enter clock stop mode and only report errors if there are
1476          * Slave devices present (ALERT or ATTACHED)
1477          */
1478         ret = sdw_bus_clk_stop(&cdns->bus);
1479         if (ret < 0 && slave_present && ret != -ENODATA) {
1480                 dev_err(cdns->dev, "bus clock stop failed %d", ret);
1481                 return ret;
1482         }
1483
1484         ret = cdns_set_wait(cdns, CDNS_MCP_STAT,
1485                             CDNS_MCP_STAT_CLK_STOP,
1486                             CDNS_MCP_STAT_CLK_STOP);
1487         if (ret < 0)
1488                 dev_err(cdns->dev, "Clock stop failed %d\n", ret);
1489
1490         return ret;
1491 }
1492 EXPORT_SYMBOL(sdw_cdns_clock_stop);
1493
1494 /**
1495  * sdw_cdns_clock_restart: Cadence PM clock restart configuration routine
1496  *
1497  * @cdns: Cadence instance
1498  * @bus_reset: context may be lost while in low power modes and the bus
1499  * may require a Severe Reset and re-enumeration after a wake.
1500  */
1501 int sdw_cdns_clock_restart(struct sdw_cdns *cdns, bool bus_reset)
1502 {
1503         int ret;
1504
1505         /* unmask Slave interrupts that were masked when stopping the clock */
1506         cdns_enable_slave_interrupts(cdns, true);
1507
1508         ret = cdns_clear_bit(cdns, CDNS_MCP_CONTROL,
1509                              CDNS_MCP_CONTROL_CLK_STOP_CLR);
1510         if (ret < 0) {
1511                 dev_err(cdns->dev, "Couldn't exit from clock stop\n");
1512                 return ret;
1513         }
1514
1515         ret = cdns_set_wait(cdns, CDNS_MCP_STAT, CDNS_MCP_STAT_CLK_STOP, 0);
1516         if (ret < 0) {
1517                 dev_err(cdns->dev, "clock stop exit failed %d\n", ret);
1518                 return ret;
1519         }
1520
1521         cdns_updatel(cdns, CDNS_MCP_CONTROL,
1522                      CDNS_MCP_CONTROL_BLOCK_WAKEUP, 0);
1523
1524         /*
1525          * clear CMD_ACCEPT so that the command ignored
1526          * will be treated as a failure during a broadcast write
1527          */
1528         cdns_updatel(cdns, CDNS_MCP_CONTROL, CDNS_MCP_CONTROL_CMD_ACCEPT, 0);
1529
1530         if (!bus_reset) {
1531
1532                 /* enable bus operations with clock and data */
1533                 cdns_updatel(cdns, CDNS_MCP_CONFIG,
1534                              CDNS_MCP_CONFIG_OP,
1535                              CDNS_MCP_CONFIG_OP_NORMAL);
1536
1537                 ret = cdns_config_update(cdns);
1538                 if (ret < 0) {
1539                         dev_err(cdns->dev, "%s: config_update failed\n", __func__);
1540                         return ret;
1541                 }
1542
1543                 ret = sdw_bus_exit_clk_stop(&cdns->bus);
1544                 if (ret < 0)
1545                         dev_err(cdns->dev, "bus failed to exit clock stop %d\n", ret);
1546         }
1547
1548         return ret;
1549 }
1550 EXPORT_SYMBOL(sdw_cdns_clock_restart);
1551
1552 /**
1553  * sdw_cdns_probe() - Cadence probe routine
1554  * @cdns: Cadence instance
1555  */
1556 int sdw_cdns_probe(struct sdw_cdns *cdns)
1557 {
1558         init_completion(&cdns->tx_complete);
1559         cdns->bus.port_ops = &cdns_port_ops;
1560
1561         INIT_WORK(&cdns->work, cdns_update_slave_status_work);
1562         return 0;
1563 }
1564 EXPORT_SYMBOL(sdw_cdns_probe);
1565
1566 int cdns_set_sdw_stream(struct snd_soc_dai *dai,
1567                         void *stream, bool pcm, int direction)
1568 {
1569         struct sdw_cdns *cdns = snd_soc_dai_get_drvdata(dai);
1570         struct sdw_cdns_dma_data *dma;
1571
1572         if (stream) {
1573                 /* first paranoia check */
1574                 if (direction == SNDRV_PCM_STREAM_PLAYBACK)
1575                         dma = dai->playback_dma_data;
1576                 else
1577                         dma = dai->capture_dma_data;
1578
1579                 if (dma) {
1580                         dev_err(dai->dev,
1581                                 "dma_data already allocated for dai %s\n",
1582                                 dai->name);
1583                         return -EINVAL;
1584                 }
1585
1586                 /* allocate and set dma info */
1587                 dma = kzalloc(sizeof(*dma), GFP_KERNEL);
1588                 if (!dma)
1589                         return -ENOMEM;
1590
1591                 if (pcm)
1592                         dma->stream_type = SDW_STREAM_PCM;
1593                 else
1594                         dma->stream_type = SDW_STREAM_PDM;
1595
1596                 dma->bus = &cdns->bus;
1597                 dma->link_id = cdns->instance;
1598
1599                 dma->stream = stream;
1600
1601                 if (direction == SNDRV_PCM_STREAM_PLAYBACK)
1602                         dai->playback_dma_data = dma;
1603                 else
1604                         dai->capture_dma_data = dma;
1605         } else {
1606                 /* for NULL stream we release allocated dma_data */
1607                 if (direction == SNDRV_PCM_STREAM_PLAYBACK) {
1608                         kfree(dai->playback_dma_data);
1609                         dai->playback_dma_data = NULL;
1610                 } else {
1611                         kfree(dai->capture_dma_data);
1612                         dai->capture_dma_data = NULL;
1613                 }
1614         }
1615         return 0;
1616 }
1617 EXPORT_SYMBOL(cdns_set_sdw_stream);
1618
1619 /**
1620  * cdns_find_pdi() - Find a free PDI
1621  *
1622  * @cdns: Cadence instance
1623  * @offset: Starting offset
1624  * @num: Number of PDIs
1625  * @pdi: PDI instances
1626  * @dai_id: DAI id
1627  *
1628  * Find a PDI for a given PDI array. The PDI num and dai_id are
1629  * expected to match, return NULL otherwise.
1630  */
1631 static struct sdw_cdns_pdi *cdns_find_pdi(struct sdw_cdns *cdns,
1632                                           unsigned int offset,
1633                                           unsigned int num,
1634                                           struct sdw_cdns_pdi *pdi,
1635                                           int dai_id)
1636 {
1637         int i;
1638
1639         for (i = offset; i < offset + num; i++)
1640                 if (pdi[i].num == dai_id)
1641                         return &pdi[i];
1642
1643         return NULL;
1644 }
1645
1646 /**
1647  * sdw_cdns_config_stream: Configure a stream
1648  *
1649  * @cdns: Cadence instance
1650  * @ch: Channel count
1651  * @dir: Data direction
1652  * @pdi: PDI to be used
1653  */
1654 void sdw_cdns_config_stream(struct sdw_cdns *cdns,
1655                             u32 ch, u32 dir, struct sdw_cdns_pdi *pdi)
1656 {
1657         u32 offset, val = 0;
1658
1659         if (dir == SDW_DATA_DIR_RX) {
1660                 val = CDNS_PORTCTRL_DIRN;
1661
1662                 if (cdns->bus.params.m_data_mode != SDW_PORT_DATA_MODE_NORMAL)
1663                         val |= CDNS_PORTCTRL_TEST_FAILED;
1664         }
1665         offset = CDNS_PORTCTRL + pdi->num * CDNS_PORT_OFFSET;
1666         cdns_updatel(cdns, offset,
1667                      CDNS_PORTCTRL_DIRN | CDNS_PORTCTRL_TEST_FAILED,
1668                      val);
1669
1670         val = pdi->num;
1671         val |= CDNS_PDI_CONFIG_SOFT_RESET;
1672         val |= FIELD_PREP(CDNS_PDI_CONFIG_CHANNEL, (1 << ch) - 1);
1673         cdns_writel(cdns, CDNS_PDI_CONFIG(pdi->num), val);
1674 }
1675 EXPORT_SYMBOL(sdw_cdns_config_stream);
1676
1677 /**
1678  * sdw_cdns_alloc_pdi() - Allocate a PDI
1679  *
1680  * @cdns: Cadence instance
1681  * @stream: Stream to be allocated
1682  * @ch: Channel count
1683  * @dir: Data direction
1684  * @dai_id: DAI id
1685  */
1686 struct sdw_cdns_pdi *sdw_cdns_alloc_pdi(struct sdw_cdns *cdns,
1687                                         struct sdw_cdns_streams *stream,
1688                                         u32 ch, u32 dir, int dai_id)
1689 {
1690         struct sdw_cdns_pdi *pdi = NULL;
1691
1692         if (dir == SDW_DATA_DIR_RX)
1693                 pdi = cdns_find_pdi(cdns, 0, stream->num_in, stream->in,
1694                                     dai_id);
1695         else
1696                 pdi = cdns_find_pdi(cdns, 0, stream->num_out, stream->out,
1697                                     dai_id);
1698
1699         /* check if we found a PDI, else find in bi-directional */
1700         if (!pdi)
1701                 pdi = cdns_find_pdi(cdns, 2, stream->num_bd, stream->bd,
1702                                     dai_id);
1703
1704         if (pdi) {
1705                 pdi->l_ch_num = 0;
1706                 pdi->h_ch_num = ch - 1;
1707                 pdi->dir = dir;
1708                 pdi->ch_count = ch;
1709         }
1710
1711         return pdi;
1712 }
1713 EXPORT_SYMBOL(sdw_cdns_alloc_pdi);
1714
1715 MODULE_LICENSE("Dual BSD/GPL");
1716 MODULE_DESCRIPTION("Cadence Soundwire Library");