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 enum sdw_command_response
 515 _cdns_xfer_msg(struct sdw_cdns *cdns, struct sdw_msg *msg, int cmd,
 516                int offset, int count, bool defer)
 517 {
 518         unsigned long time;
 519         u32 base, i, data;
 520         u16 addr;
 521
 522         /* Program the watermark level for RX FIFO */
 523         if (cdns->msg_count != count) {
 524                 cdns_writel(cdns, CDNS_MCP_FIFOLEVEL, count);
 525                 cdns->msg_count = count;
 526         }
 527
 528         base = CDNS_MCP_CMD_BASE;
 529         addr = msg->addr;
 530
 531         for (i = 0; i < count; i++) {
 532                 data = FIELD_PREP(CDNS_MCP_CMD_DEV_ADDR, msg->dev_num);
 533                 data |= FIELD_PREP(CDNS_MCP_CMD_COMMAND, cmd);
 534                 data |= FIELD_PREP(CDNS_MCP_CMD_REG_ADDR, addr);
 535                 addr++;
 536
 537                 if (msg->flags == SDW_MSG_FLAG_WRITE)
 538                         data |= msg->buf[i + offset];
 539
 540                 data |= FIELD_PREP(CDNS_MCP_CMD_SSP_TAG, msg->ssp_sync);
 541                 cdns_writel(cdns, base, data);
 542                 base += CDNS_MCP_CMD_WORD_LEN;
 543         }
 544
 545         if (defer)
 546                 return SDW_CMD_OK;
 547
 548         /* wait for timeout or response */
 549         time = wait_for_completion_timeout(&cdns->tx_complete,
 550                                            msecs_to_jiffies(CDNS_TX_TIMEOUT));
 551         if (!time) {
 552                 dev_err(cdns->dev, "IO transfer timed out, cmd %d device %d addr %x len %d\n",
 553                         cmd, msg->dev_num, msg->addr, msg->len);
 554                 msg->len = 0;
 555                 return SDW_CMD_TIMEOUT;
 556         }
 557
 558         return cdns_fill_msg_resp(cdns, msg, count, offset);
 559 }
 560
 561 static enum sdw_command_response
 562 cdns_program_scp_addr(struct sdw_cdns *cdns, struct sdw_msg *msg)
 563 {
 564         int nack = 0, no_ack = 0;
 565         unsigned long time;
 566         u32 data[2], base;
 567         int i;
 568
 569         /* Program the watermark level for RX FIFO */
 570         if (cdns->msg_count != CDNS_SCP_RX_FIFOLEVEL) {
 571                 cdns_writel(cdns, CDNS_MCP_FIFOLEVEL, CDNS_SCP_RX_FIFOLEVEL);
 572                 cdns->msg_count = CDNS_SCP_RX_FIFOLEVEL;
 573         }
 574
 575         data[0] = FIELD_PREP(CDNS_MCP_CMD_DEV_ADDR, msg->dev_num);
 576         data[0] |= FIELD_PREP(CDNS_MCP_CMD_COMMAND, 0x3);
 577         data[1] = data[0];
 578
 579         data[0] |= FIELD_PREP(CDNS_MCP_CMD_REG_ADDR, SDW_SCP_ADDRPAGE1);
 580         data[1] |= FIELD_PREP(CDNS_MCP_CMD_REG_ADDR, SDW_SCP_ADDRPAGE2);
 581
 582         data[0] |= msg->addr_page1;
 583         data[1] |= msg->addr_page2;
 584
 585         base = CDNS_MCP_CMD_BASE;
 586         cdns_writel(cdns, base, data[0]);
 587         base += CDNS_MCP_CMD_WORD_LEN;
 588         cdns_writel(cdns, base, data[1]);
 589
 590         time = wait_for_completion_timeout(&cdns->tx_complete,
 591                                            msecs_to_jiffies(CDNS_TX_TIMEOUT));
 592         if (!time) {
 593                 dev_err(cdns->dev, "SCP Msg trf timed out\n");
 594                 msg->len = 0;
 595                 return SDW_CMD_TIMEOUT;
 596         }
 597
 598         /* check response the writes */
 599         for (i = 0; i < 2; i++) {
 600                 if (!(cdns->response_buf[i] & CDNS_MCP_RESP_ACK)) {
 601                         no_ack = 1;
 602                         dev_err(cdns->dev, "Program SCP Ack not received\n");
 603                         if (cdns->response_buf[i] & CDNS_MCP_RESP_NACK) {
 604                                 nack = 1;
 605                                 dev_err(cdns->dev, "Program SCP NACK received\n");
 606                         }
 607                 }
 608         }
 609
 610         /* For NACK, NO ack, don't return err if we are in Broadcast mode */
 611         if (nack) {
 612                 dev_err_ratelimited(cdns->dev,
 613                                     "SCP_addrpage NACKed for Slave %d\n", msg->dev_num);
 614                 return SDW_CMD_FAIL;
 615         }
 616
 617         if (no_ack) {
 618                 dev_dbg_ratelimited(cdns->dev,
 619                                     "SCP_addrpage ignored for Slave %d\n", msg->dev_num);
 620                 return SDW_CMD_IGNORED;
 621         }
 622
 623         return SDW_CMD_OK;
 624 }
 625
 626 static int cdns_prep_msg(struct sdw_cdns *cdns, struct sdw_msg *msg, int *cmd)
 627 {
 628         int ret;
 629
 630         if (msg->page) {
 631                 ret = cdns_program_scp_addr(cdns, msg);
 632                 if (ret) {
 633                         msg->len = 0;
 634                         return ret;
 635                 }
 636         }
 637
 638         switch (msg->flags) {
 639         case SDW_MSG_FLAG_READ:
 640                 *cmd = CDNS_MCP_CMD_READ;
 641                 break;
 642
 643         case SDW_MSG_FLAG_WRITE:
 644                 *cmd = CDNS_MCP_CMD_WRITE;
 645                 break;
 646
 647         default:
 648                 dev_err(cdns->dev, "Invalid msg cmd: %d\n", msg->flags);
 649                 return -EINVAL;
 650         }
 651
 652         return 0;
 653 }
 654
 655 enum sdw_command_response
 656 cdns_xfer_msg(struct sdw_bus *bus, struct sdw_msg *msg)
 657 {
 658         struct sdw_cdns *cdns = bus_to_cdns(bus);
 659         int cmd = 0, ret, i;
 660
 661         ret = cdns_prep_msg(cdns, msg, &cmd);
 662         if (ret)
 663                 return SDW_CMD_FAIL_OTHER;
 664
 665         for (i = 0; i < msg->len / CDNS_MCP_CMD_LEN; i++) {
 666                 ret = _cdns_xfer_msg(cdns, msg, cmd, i * CDNS_MCP_CMD_LEN,
 667                                      CDNS_MCP_CMD_LEN, false);
 668                 if (ret < 0)
 669                         goto exit;
 670         }
 671
 672         if (!(msg->len % CDNS_MCP_CMD_LEN))
 673                 goto exit;
 674
 675         ret = _cdns_xfer_msg(cdns, msg, cmd, i * CDNS_MCP_CMD_LEN,
 676                              msg->len % CDNS_MCP_CMD_LEN, false);
 677
 678 exit:
 679         return ret;
 680 }
 681 EXPORT_SYMBOL(cdns_xfer_msg);
 682
 683 enum sdw_command_response
 684 cdns_xfer_msg_defer(struct sdw_bus *bus,
 685                     struct sdw_msg *msg, struct sdw_defer *defer)
 686 {
 687         struct sdw_cdns *cdns = bus_to_cdns(bus);
 688         int cmd = 0, ret;
 689
 690         /* for defer only 1 message is supported */
 691         if (msg->len > 1)
 692                 return -ENOTSUPP;
 693
 694         ret = cdns_prep_msg(cdns, msg, &cmd);
 695         if (ret)
 696                 return SDW_CMD_FAIL_OTHER;
 697
 698         cdns->defer = defer;
 699         cdns->defer->length = msg->len;
 700
 701         return _cdns_xfer_msg(cdns, msg, cmd, 0, msg->len, true);
 702 }
 703 EXPORT_SYMBOL(cdns_xfer_msg_defer);
 704
 705 enum sdw_command_response
 706 cdns_reset_page_addr(struct sdw_bus *bus, unsigned int dev_num)
 707 {
 708         struct sdw_cdns *cdns = bus_to_cdns(bus);
 709         struct sdw_msg msg;
 710
 711         /* Create dummy message with valid device number */
 712         memset(&msg, 0, sizeof(msg));
 713         msg.dev_num = dev_num;
 714
 715         return cdns_program_scp_addr(cdns, &msg);
 716 }
 717 EXPORT_SYMBOL(cdns_reset_page_addr);
 718
 719 /*
 720  * IRQ handling
 721  */
 722
 723 static void cdns_read_response(struct sdw_cdns *cdns)
 724 {
 725         u32 num_resp, cmd_base;
 726         int i;
 727
 728         num_resp = cdns_readl(cdns, CDNS_MCP_FIFOSTAT);
 729         num_resp &= CDNS_MCP_RX_FIFO_AVAIL;
 730
 731         cmd_base = CDNS_MCP_CMD_BASE;
 732
 733         for (i = 0; i < num_resp; i++) {
 734                 cdns->response_buf[i] = cdns_readl(cdns, cmd_base);
 735                 cmd_base += CDNS_MCP_CMD_WORD_LEN;
 736         }
 737 }
 738
 739 static int cdns_update_slave_status(struct sdw_cdns *cdns,
 740                                     u32 slave0, u32 slave1)
 741 {
 742         enum sdw_slave_status status[SDW_MAX_DEVICES + 1];
 743         bool is_slave = false;
 744         u64 slave;
 745         u32 mask;
 746         int i, set_status;
 747
 748         /* combine the two status */
 749         slave = ((u64)slave1 << 32) | slave0;
 750         memset(status, 0, sizeof(status));
 751
 752         for (i = 0; i <= SDW_MAX_DEVICES; i++) {
 753                 mask = (slave >> (i * CDNS_MCP_SLAVE_STATUS_NUM)) &
 754                                 CDNS_MCP_SLAVE_STATUS_BITS;
 755                 if (!mask)
 756                         continue;
 757
 758                 is_slave = true;
 759                 set_status = 0;
 760
 761                 if (mask & CDNS_MCP_SLAVE_INTSTAT_RESERVED) {
 762                         status[i] = SDW_SLAVE_RESERVED;
 763                         set_status++;
 764                 }
 765
 766                 if (mask & CDNS_MCP_SLAVE_INTSTAT_ATTACHED) {
 767                         status[i] = SDW_SLAVE_ATTACHED;
 768                         set_status++;
 769                 }
 770
 771                 if (mask & CDNS_MCP_SLAVE_INTSTAT_ALERT) {
 772                         status[i] = SDW_SLAVE_ALERT;
 773                         set_status++;
 774                 }
 775
 776                 if (mask & CDNS_MCP_SLAVE_INTSTAT_NPRESENT) {
 777                         status[i] = SDW_SLAVE_UNATTACHED;
 778                         set_status++;
 779                 }
 780
 781                 /* first check if Slave reported multiple status */
 782                 if (set_status > 1) {
 783                         u32 val;
 784
 785                         dev_warn_ratelimited(cdns->dev,
 786                                              "Slave %d reported multiple Status: %d\n",
 787                                              i, mask);
 788
 789                         /* check latest status extracted from PING commands */
 790                         val = cdns_readl(cdns, CDNS_MCP_SLAVE_STAT);
 791                         val >>= (i * 2);
 792
 793                         switch (val & 0x3) {
 794                         case 0:
 795                                 status[i] = SDW_SLAVE_UNATTACHED;
 796                                 break;
 797                         case 1:
 798                                 status[i] = SDW_SLAVE_ATTACHED;
 799                                 break;
 800                         case 2:
 801                                 status[i] = SDW_SLAVE_ALERT;
 802                                 break;
 803                         case 3:
 804                         default:
 805                                 status[i] = SDW_SLAVE_RESERVED;
 806                                 break;
 807                         }
 808
 809                         dev_warn_ratelimited(cdns->dev,
 810                                              "Slave %d status updated to %d\n",
 811                                              i, status[i]);
 812
 813                 }
 814         }
 815
 816         if (is_slave)
 817                 return sdw_handle_slave_status(&cdns->bus, status);
 818
 819         return 0;
 820 }
 821
 822 /**
 823  * sdw_cdns_irq() - Cadence interrupt handler
 824  * @irq: irq number
 825  * @dev_id: irq context
 826  */
 827 irqreturn_t sdw_cdns_irq(int irq, void *dev_id)
 828 {
 829         struct sdw_cdns *cdns = dev_id;
 830         u32 int_status;
 831         int ret = IRQ_HANDLED;
 832
 833         /* Check if the link is up */
 834         if (!cdns->link_up)
 835                 return IRQ_NONE;
 836
 837         int_status = cdns_readl(cdns, CDNS_MCP_INTSTAT);
 838
 839         /* check for reserved values read as zero */
 840         if (int_status & CDNS_MCP_INT_RESERVED)
 841                 return IRQ_NONE;
 842
 843         if (!(int_status & CDNS_MCP_INT_IRQ))
 844                 return IRQ_NONE;
 845
 846         if (int_status & CDNS_MCP_INT_RX_WL) {
 847                 cdns_read_response(cdns);
 848
 849                 if (cdns->defer) {
 850                         cdns_fill_msg_resp(cdns, cdns->defer->msg,
 851                                            cdns->defer->length, 0);
 852                         complete(&cdns->defer->complete);
 853                         cdns->defer = NULL;
 854                 } else {
 855                         complete(&cdns->tx_complete);
 856                 }
 857         }
 858
 859         if (int_status & CDNS_MCP_INT_PARITY) {
 860                 /* Parity error detected by Master */
 861                 dev_err_ratelimited(cdns->dev, "Parity error\n");
 862         }
 863
 864         if (int_status & CDNS_MCP_INT_CTRL_CLASH) {
 865                 /* Slave is driving bit slot during control word */
 866                 dev_err_ratelimited(cdns->dev, "Bus clash for control word\n");
 867         }
 868
 869         if (int_status & CDNS_MCP_INT_DATA_CLASH) {
 870                 /*
 871                  * Multiple slaves trying to drive bit slot, or issue with
 872                  * ownership of data bits or Slave gone bonkers
 873                  */
 874                 dev_err_ratelimited(cdns->dev, "Bus clash for data word\n");
 875         }
 876
 877         if (cdns->bus.params.m_data_mode != SDW_PORT_DATA_MODE_NORMAL &&
 878             int_status & CDNS_MCP_INT_DPINT) {
 879                 u32 port_intstat;
 880
 881                 /* just log which ports report an error */
 882                 port_intstat = cdns_readl(cdns, CDNS_MCP_PORT_INTSTAT);
 883                 dev_err_ratelimited(cdns->dev, "DP interrupt: PortIntStat %8x\n",
 884                                     port_intstat);
 885
 886                 /* clear status w/ write1 */
 887                 cdns_writel(cdns, CDNS_MCP_PORT_INTSTAT, port_intstat);
 888         }
 889
 890         if (int_status & CDNS_MCP_INT_SLAVE_MASK) {
 891                 /* Mask the Slave interrupt and wake thread */
 892                 cdns_updatel(cdns, CDNS_MCP_INTMASK,
 893                              CDNS_MCP_INT_SLAVE_MASK, 0);
 894
 895                 int_status &= ~CDNS_MCP_INT_SLAVE_MASK;
 896
 897                 /*
 898                  * Deal with possible race condition between interrupt
 899                  * handling and disabling interrupts on suspend.
 900                  *
 901                  * If the master is in the process of disabling
 902                  * interrupts, don't schedule a workqueue
 903                  */
 904                 if (cdns->interrupt_enabled)
 905                         schedule_work(&cdns->work);
 906         }
 907
 908         cdns_writel(cdns, CDNS_MCP_INTSTAT, int_status);
 909         return ret;
 910 }
 911 EXPORT_SYMBOL(sdw_cdns_irq);
 912
 913 /**
 914  * To update slave status in a work since we will need to handle
 915  * other interrupts eg. CDNS_MCP_INT_RX_WL during the update slave
 916  * process.
 917  * @work: cdns worker thread
 918  */
 919 static void cdns_update_slave_status_work(struct work_struct *work)
 920 {
 921         struct sdw_cdns *cdns =
 922                 container_of(work, struct sdw_cdns, work);
 923         u32 slave0, slave1;
 924
 925         dev_dbg_ratelimited(cdns->dev, "Slave status change\n");
 926
 927         slave0 = cdns_readl(cdns, CDNS_MCP_SLAVE_INTSTAT0);
 928         slave1 = cdns_readl(cdns, CDNS_MCP_SLAVE_INTSTAT1);
 929
 930         cdns_update_slave_status(cdns, slave0, slave1);
 931         cdns_writel(cdns, CDNS_MCP_SLAVE_INTSTAT0, slave0);
 932         cdns_writel(cdns, CDNS_MCP_SLAVE_INTSTAT1, slave1);
 933
 934         /* clear and unmask Slave interrupt now */
 935         cdns_writel(cdns, CDNS_MCP_INTSTAT, CDNS_MCP_INT_SLAVE_MASK);
 936         cdns_updatel(cdns, CDNS_MCP_INTMASK,
 937                      CDNS_MCP_INT_SLAVE_MASK, CDNS_MCP_INT_SLAVE_MASK);
 938
 939 }
 940
 941 /*
 942  * init routines
 943  */
 944
 945 /**
 946  * sdw_cdns_exit_reset() - Program reset parameters and start bus operations
 947  * @cdns: Cadence instance
 948  */
 949 int sdw_cdns_exit_reset(struct sdw_cdns *cdns)
 950 {
 951         /* program maximum length reset to be safe */
 952         cdns_updatel(cdns, CDNS_MCP_CONTROL,
 953                      CDNS_MCP_CONTROL_RST_DELAY,
 954                      CDNS_MCP_CONTROL_RST_DELAY);
 955
 956         /* use hardware generated reset */
 957         cdns_updatel(cdns, CDNS_MCP_CONTROL,
 958                      CDNS_MCP_CONTROL_HW_RST,
 959                      CDNS_MCP_CONTROL_HW_RST);
 960
 961         /* commit changes */
 962         cdns_updatel(cdns, CDNS_MCP_CONFIG_UPDATE,
 963                      CDNS_MCP_CONFIG_UPDATE_BIT,
 964                      CDNS_MCP_CONFIG_UPDATE_BIT);
 965
 966         /* don't wait here */
 967         return 0;
 968
 969 }
 970 EXPORT_SYMBOL(sdw_cdns_exit_reset);
 971
 972 /**
 973  * sdw_cdns_enable_slave_interrupt() - Enable SDW slave interrupts
 974  * @cdns: Cadence instance
 975  * @state: boolean for true/false
 976  */
 977 static void cdns_enable_slave_interrupts(struct sdw_cdns *cdns, bool state)
 978 {
 979         u32 mask;
 980
 981         mask = cdns_readl(cdns, CDNS_MCP_INTMASK);
 982         if (state)
 983                 mask |= CDNS_MCP_INT_SLAVE_MASK;
 984         else
 985                 mask &= ~CDNS_MCP_INT_SLAVE_MASK;
 986
 987         cdns_writel(cdns, CDNS_MCP_INTMASK, mask);
 988 }
 989
 990 /**
 991  * sdw_cdns_enable_interrupt() - Enable SDW interrupts
 992  * @cdns: Cadence instance
 993  * @state: True if we are trying to enable interrupt.
 994  */
 995 int sdw_cdns_enable_interrupt(struct sdw_cdns *cdns, bool state)
 996 {
 997         u32 slave_intmask0 = 0;
 998         u32 slave_intmask1 = 0;
 999         u32 mask = 0;
1000
1001         if (!state)
1002                 goto update_masks;
1003
1004         slave_intmask0 = CDNS_MCP_SLAVE_INTMASK0_MASK;
1005         slave_intmask1 = CDNS_MCP_SLAVE_INTMASK1_MASK;
1006
1007         /* enable detection of all slave state changes */
1008         mask = CDNS_MCP_INT_SLAVE_MASK;
1009
1010         /* enable detection of bus issues */
1011         mask |= CDNS_MCP_INT_CTRL_CLASH | CDNS_MCP_INT_DATA_CLASH |
1012                 CDNS_MCP_INT_PARITY;
1013
1014         /* port interrupt limited to test modes for now */
1015         if (cdns->bus.params.m_data_mode != SDW_PORT_DATA_MODE_NORMAL)
1016                 mask |= CDNS_MCP_INT_DPINT;
1017
1018         /* enable detection of RX fifo level */
1019         mask |= CDNS_MCP_INT_RX_WL;
1020
1021         /*
1022          * CDNS_MCP_INT_IRQ needs to be set otherwise all previous
1023          * settings are irrelevant
1024          */
1025         mask |= CDNS_MCP_INT_IRQ;
1026
1027         if (interrupt_mask) /* parameter override */
1028                 mask = interrupt_mask;
1029
1030 update_masks:
1031         /* clear slave interrupt status before enabling interrupt */
1032         if (state) {
1033                 u32 slave_state;
1034
1035                 slave_state = cdns_readl(cdns, CDNS_MCP_SLAVE_INTSTAT0);
1036                 cdns_writel(cdns, CDNS_MCP_SLAVE_INTSTAT0, slave_state);
1037                 slave_state = cdns_readl(cdns, CDNS_MCP_SLAVE_INTSTAT1);
1038                 cdns_writel(cdns, CDNS_MCP_SLAVE_INTSTAT1, slave_state);
1039         }
1040         cdns->interrupt_enabled = state;
1041
1042         /*
1043          * Complete any on-going status updates before updating masks,
1044          * and cancel queued status updates.
1045          *
1046          * There could be a race with a new interrupt thrown before
1047          * the 3 mask updates below are complete, so in the interrupt
1048          * we use the 'interrupt_enabled' status to prevent new work
1049          * from being queued.
1050          */
1051         if (!state)
1052                 cancel_work_sync(&cdns->work);
1053
1054         cdns_writel(cdns, CDNS_MCP_SLAVE_INTMASK0, slave_intmask0);
1055         cdns_writel(cdns, CDNS_MCP_SLAVE_INTMASK1, slave_intmask1);
1056         cdns_writel(cdns, CDNS_MCP_INTMASK, mask);
1057
1058         return 0;
1059 }
1060 EXPORT_SYMBOL(sdw_cdns_enable_interrupt);
1061
1062 static int cdns_allocate_pdi(struct sdw_cdns *cdns,
1063                              struct sdw_cdns_pdi **stream,
1064                              u32 num, u32 pdi_offset)
1065 {
1066         struct sdw_cdns_pdi *pdi;
1067         int i;
1068
1069         if (!num)
1070                 return 0;
1071
1072         pdi = devm_kcalloc(cdns->dev, num, sizeof(*pdi), GFP_KERNEL);
1073         if (!pdi)
1074                 return -ENOMEM;
1075
1076         for (i = 0; i < num; i++) {
1077                 pdi[i].num = i + pdi_offset;
1078         }
1079
1080         *stream = pdi;
1081         return 0;
1082 }
1083
1084 /**
1085  * sdw_cdns_pdi_init() - PDI initialization routine
1086  *
1087  * @cdns: Cadence instance
1088  * @config: Stream configurations
1089  */
1090 int sdw_cdns_pdi_init(struct sdw_cdns *cdns,
1091                       struct sdw_cdns_stream_config config)
1092 {
1093         struct sdw_cdns_streams *stream;
1094         int offset;
1095         int ret;
1096
1097         cdns->pcm.num_bd = config.pcm_bd;
1098         cdns->pcm.num_in = config.pcm_in;
1099         cdns->pcm.num_out = config.pcm_out;
1100         cdns->pdm.num_bd = config.pdm_bd;
1101         cdns->pdm.num_in = config.pdm_in;
1102         cdns->pdm.num_out = config.pdm_out;
1103
1104         /* Allocate PDIs for PCMs */
1105         stream = &cdns->pcm;
1106
1107         /* we allocate PDI0 and PDI1 which are used for Bulk */
1108         offset = 0;
1109
1110         ret = cdns_allocate_pdi(cdns, &stream->bd,
1111                                 stream->num_bd, offset);
1112         if (ret)
1113                 return ret;
1114
1115         offset += stream->num_bd;
1116
1117         ret = cdns_allocate_pdi(cdns, &stream->in,
1118                                 stream->num_in, offset);
1119         if (ret)
1120                 return ret;
1121
1122         offset += stream->num_in;
1123
1124         ret = cdns_allocate_pdi(cdns, &stream->out,
1125                                 stream->num_out, offset);
1126         if (ret)
1127                 return ret;
1128
1129         /* Update total number of PCM PDIs */
1130         stream->num_pdi = stream->num_bd + stream->num_in + stream->num_out;
1131         cdns->num_ports = stream->num_pdi;
1132
1133         /* Allocate PDIs for PDMs */
1134         stream = &cdns->pdm;
1135         ret = cdns_allocate_pdi(cdns, &stream->bd,
1136                                 stream->num_bd, offset);
1137         if (ret)
1138                 return ret;
1139
1140         offset += stream->num_bd;
1141
1142         ret = cdns_allocate_pdi(cdns, &stream->in,
1143                                 stream->num_in, offset);
1144         if (ret)
1145                 return ret;
1146
1147         offset += stream->num_in;
1148
1149         ret = cdns_allocate_pdi(cdns, &stream->out,
1150                                 stream->num_out, offset);
1151
1152         if (ret)
1153                 return ret;
1154
1155         /* Update total number of PDM PDIs */
1156         stream->num_pdi = stream->num_bd + stream->num_in + stream->num_out;
1157         cdns->num_ports += stream->num_pdi;
1158
1159         return 0;
1160 }
1161 EXPORT_SYMBOL(sdw_cdns_pdi_init);
1162
1163 static u32 cdns_set_initial_frame_shape(int n_rows, int n_cols)
1164 {
1165         u32 val;
1166         int c;
1167         int r;
1168
1169         r = sdw_find_row_index(n_rows);
1170         c = sdw_find_col_index(n_cols);
1171
1172         val = FIELD_PREP(CDNS_MCP_FRAME_SHAPE_ROW_MASK, r);
1173         val |= FIELD_PREP(CDNS_MCP_FRAME_SHAPE_COL_MASK, c);
1174
1175         return val;
1176 }
1177
1178 static void cdns_init_clock_ctrl(struct sdw_cdns *cdns)
1179 {
1180         struct sdw_bus *bus = &cdns->bus;
1181         struct sdw_master_prop *prop = &bus->prop;
1182         u32 val;
1183         u32 ssp_interval;
1184         int divider;
1185
1186         /* Set clock divider */
1187         divider = (prop->mclk_freq / prop->max_clk_freq) - 1;
1188
1189         cdns_updatel(cdns, CDNS_MCP_CLK_CTRL0,
1190                      CDNS_MCP_CLK_MCLKD_MASK, divider);
1191         cdns_updatel(cdns, CDNS_MCP_CLK_CTRL1,
1192                      CDNS_MCP_CLK_MCLKD_MASK, divider);
1193
1194         /*
1195          * Frame shape changes after initialization have to be done
1196          * with the bank switch mechanism
1197          */
1198         val = cdns_set_initial_frame_shape(prop->default_row,
1199                                            prop->default_col);
1200         cdns_writel(cdns, CDNS_MCP_FRAME_SHAPE_INIT, val);
1201
1202         /* Set SSP interval to default value */
1203         ssp_interval = prop->default_frame_rate / SDW_CADENCE_GSYNC_HZ;
1204         cdns_writel(cdns, CDNS_MCP_SSP_CTRL0, ssp_interval);
1205         cdns_writel(cdns, CDNS_MCP_SSP_CTRL1, ssp_interval);
1206 }
1207
1208 /**
1209  * sdw_cdns_init() - Cadence initialization
1210  * @cdns: Cadence instance
1211  */
1212 int sdw_cdns_init(struct sdw_cdns *cdns)
1213 {
1214         u32 val;
1215
1216         cdns_init_clock_ctrl(cdns);
1217
1218         /* reset msg_count to default value of FIFOLEVEL */
1219         cdns->msg_count = cdns_readl(cdns, CDNS_MCP_FIFOLEVEL);
1220
1221         /* flush command FIFOs */
1222         cdns_updatel(cdns, CDNS_MCP_CONTROL, CDNS_MCP_CONTROL_CMD_RST,
1223                      CDNS_MCP_CONTROL_CMD_RST);
1224
1225         /* Set cmd accept mode */
1226         cdns_updatel(cdns, CDNS_MCP_CONTROL, CDNS_MCP_CONTROL_CMD_ACCEPT,
1227                      CDNS_MCP_CONTROL_CMD_ACCEPT);
1228
1229         /* Configure mcp config */
1230         val = cdns_readl(cdns, CDNS_MCP_CONFIG);
1231
1232         /* enable bus operations with clock and data */
1233         val &= ~CDNS_MCP_CONFIG_OP;
1234         val |= CDNS_MCP_CONFIG_OP_NORMAL;
1235
1236         /* Set cmd mode for Tx and Rx cmds */
1237         val &= ~CDNS_MCP_CONFIG_CMD;
1238
1239         /* Disable sniffer mode */
1240         val &= ~CDNS_MCP_CONFIG_SNIFFER;
1241
1242         /* Disable auto bus release */
1243         val &= ~CDNS_MCP_CONFIG_BUS_REL;
1244
1245         if (cdns->bus.multi_link)
1246                 /* Set Multi-master mode to take gsync into account */
1247                 val |= CDNS_MCP_CONFIG_MMASTER;
1248
1249         /* leave frame delay to hardware default of 0x1F */
1250
1251         /* leave command retry to hardware default of 0 */
1252
1253         cdns_writel(cdns, CDNS_MCP_CONFIG, val);
1254
1255         /* changes will be committed later */
1256         return 0;
1257 }
1258 EXPORT_SYMBOL(sdw_cdns_init);
1259
1260 int cdns_bus_conf(struct sdw_bus *bus, struct sdw_bus_params *params)
1261 {
1262         struct sdw_master_prop *prop = &bus->prop;
1263         struct sdw_cdns *cdns = bus_to_cdns(bus);
1264         int mcp_clkctrl_off;
1265         int divider;
1266
1267         if (!params->curr_dr_freq) {
1268                 dev_err(cdns->dev, "NULL curr_dr_freq\n");
1269                 return -EINVAL;
1270         }
1271
1272         divider = prop->mclk_freq * SDW_DOUBLE_RATE_FACTOR /
1273                 params->curr_dr_freq;
1274         divider--; /* divider is 1/(N+1) */
1275
1276         if (params->next_bank)
1277                 mcp_clkctrl_off = CDNS_MCP_CLK_CTRL1;
1278         else
1279                 mcp_clkctrl_off = CDNS_MCP_CLK_CTRL0;
1280
1281         cdns_updatel(cdns, mcp_clkctrl_off, CDNS_MCP_CLK_MCLKD_MASK, divider);
1282
1283         return 0;
1284 }
1285 EXPORT_SYMBOL(cdns_bus_conf);
1286
1287 static int cdns_port_params(struct sdw_bus *bus,
1288                             struct sdw_port_params *p_params, unsigned int bank)
1289 {
1290         struct sdw_cdns *cdns = bus_to_cdns(bus);
1291         int dpn_config = 0, dpn_config_off;
1292
1293         if (bank)
1294                 dpn_config_off = CDNS_DPN_B1_CONFIG(p_params->num);
1295         else
1296                 dpn_config_off = CDNS_DPN_B0_CONFIG(p_params->num);
1297
1298         dpn_config = cdns_readl(cdns, dpn_config_off);
1299
1300         u32p_replace_bits(&dpn_config, (p_params->bps - 1), CDNS_DPN_CONFIG_WL);
1301         u32p_replace_bits(&dpn_config, p_params->flow_mode, CDNS_DPN_CONFIG_PORT_FLOW);
1302         u32p_replace_bits(&dpn_config, p_params->data_mode, CDNS_DPN_CONFIG_PORT_DAT);
1303
1304         cdns_writel(cdns, dpn_config_off, dpn_config);
1305
1306         return 0;
1307 }
1308
1309 static int cdns_transport_params(struct sdw_bus *bus,
1310                                  struct sdw_transport_params *t_params,
1311                                  enum sdw_reg_bank bank)
1312 {
1313         struct sdw_cdns *cdns = bus_to_cdns(bus);
1314         int dpn_offsetctrl = 0, dpn_offsetctrl_off;
1315         int dpn_config = 0, dpn_config_off;
1316         int dpn_hctrl = 0, dpn_hctrl_off;
1317         int num = t_params->port_num;
1318         int dpn_samplectrl_off;
1319
1320         /*
1321          * Note: Only full data port is supported on the Master side for
1322          * both PCM and PDM ports.
1323          */
1324
1325         if (bank) {
1326                 dpn_config_off = CDNS_DPN_B1_CONFIG(num);
1327                 dpn_samplectrl_off = CDNS_DPN_B1_SAMPLE_CTRL(num);
1328                 dpn_hctrl_off = CDNS_DPN_B1_HCTRL(num);
1329                 dpn_offsetctrl_off = CDNS_DPN_B1_OFFSET_CTRL(num);
1330         } else {
1331                 dpn_config_off = CDNS_DPN_B0_CONFIG(num);
1332                 dpn_samplectrl_off = CDNS_DPN_B0_SAMPLE_CTRL(num);
1333                 dpn_hctrl_off = CDNS_DPN_B0_HCTRL(num);
1334                 dpn_offsetctrl_off = CDNS_DPN_B0_OFFSET_CTRL(num);
1335         }
1336
1337         dpn_config = cdns_readl(cdns, dpn_config_off);
1338         u32p_replace_bits(&dpn_config, t_params->blk_grp_ctrl, CDNS_DPN_CONFIG_BGC);
1339         u32p_replace_bits(&dpn_config, t_params->blk_pkg_mode, CDNS_DPN_CONFIG_BPM);
1340         cdns_writel(cdns, dpn_config_off, dpn_config);
1341
1342         u32p_replace_bits(&dpn_offsetctrl, t_params->offset1, CDNS_DPN_OFFSET_CTRL_1);
1343         u32p_replace_bits(&dpn_offsetctrl, t_params->offset2, CDNS_DPN_OFFSET_CTRL_2);
1344         cdns_writel(cdns, dpn_offsetctrl_off,  dpn_offsetctrl);
1345
1346         u32p_replace_bits(&dpn_hctrl, t_params->hstart, CDNS_DPN_HCTRL_HSTART);
1347         u32p_replace_bits(&dpn_hctrl, t_params->hstop, CDNS_DPN_HCTRL_HSTOP);
1348         u32p_replace_bits(&dpn_hctrl, t_params->lane_ctrl, CDNS_DPN_HCTRL_LCTRL);
1349
1350         cdns_writel(cdns, dpn_hctrl_off, dpn_hctrl);
1351         cdns_writel(cdns, dpn_samplectrl_off, (t_params->sample_interval - 1));
1352
1353         return 0;
1354 }
1355
1356 static int cdns_port_enable(struct sdw_bus *bus,
1357                             struct sdw_enable_ch *enable_ch, unsigned int bank)
1358 {
1359         struct sdw_cdns *cdns = bus_to_cdns(bus);
1360         int dpn_chnen_off, ch_mask;
1361
1362         if (bank)
1363                 dpn_chnen_off = CDNS_DPN_B1_CH_EN(enable_ch->port_num);
1364         else
1365                 dpn_chnen_off = CDNS_DPN_B0_CH_EN(enable_ch->port_num);
1366
1367         ch_mask = enable_ch->ch_mask * enable_ch->enable;
1368         cdns_writel(cdns, dpn_chnen_off, ch_mask);
1369
1370         return 0;
1371 }
1372
1373 static const struct sdw_master_port_ops cdns_port_ops = {
1374         .dpn_set_port_params = cdns_port_params,
1375         .dpn_set_port_transport_params = cdns_transport_params,
1376         .dpn_port_enable_ch = cdns_port_enable,
1377 };
1378
1379 /**
1380  * sdw_cdns_is_clock_stop: Check clock status
1381  *
1382  * @cdns: Cadence instance
1383  */
1384 bool sdw_cdns_is_clock_stop(struct sdw_cdns *cdns)
1385 {
1386         return !!(cdns_readl(cdns, CDNS_MCP_STAT) & CDNS_MCP_STAT_CLK_STOP);
1387 }
1388 EXPORT_SYMBOL(sdw_cdns_is_clock_stop);
1389
1390 /**
1391  * sdw_cdns_clock_stop: Cadence clock stop configuration routine
1392  *
1393  * @cdns: Cadence instance
1394  * @block_wake: prevent wakes if required by the platform
1395  */
1396 int sdw_cdns_clock_stop(struct sdw_cdns *cdns, bool block_wake)
1397 {
1398         bool slave_present = false;
1399         struct sdw_slave *slave;
1400         int ret;
1401
1402         /* Check suspend status */
1403         if (sdw_cdns_is_clock_stop(cdns)) {
1404                 dev_dbg(cdns->dev, "Clock is already stopped\n");
1405                 return 0;
1406         }
1407
1408         /*
1409          * Before entering clock stop we mask the Slave
1410          * interrupts. This helps avoid having to deal with e.g. a
1411          * Slave becoming UNATTACHED while the clock is being stopped
1412          */
1413         cdns_enable_slave_interrupts(cdns, false);
1414
1415         /*
1416          * For specific platforms, it is required to be able to put
1417          * master into a state in which it ignores wake-up trials
1418          * in clock stop state
1419          */
1420         if (block_wake)
1421                 cdns_updatel(cdns, CDNS_MCP_CONTROL,
1422                              CDNS_MCP_CONTROL_BLOCK_WAKEUP,
1423                              CDNS_MCP_CONTROL_BLOCK_WAKEUP);
1424
1425         list_for_each_entry(slave, &cdns->bus.slaves, node) {
1426                 if (slave->status == SDW_SLAVE_ATTACHED ||
1427                     slave->status == SDW_SLAVE_ALERT) {
1428                         slave_present = true;
1429                         break;
1430                 }
1431         }
1432
1433         /*
1434          * This CMD_ACCEPT should be used when there are no devices
1435          * attached on the link when entering clock stop mode. If this is
1436          * not set and there is a broadcast write then the command ignored
1437          * will be treated as a failure
1438          */
1439         if (!slave_present)
1440                 cdns_updatel(cdns, CDNS_MCP_CONTROL,
1441                              CDNS_MCP_CONTROL_CMD_ACCEPT,
1442                              CDNS_MCP_CONTROL_CMD_ACCEPT);
1443         else
1444                 cdns_updatel(cdns, CDNS_MCP_CONTROL,
1445                              CDNS_MCP_CONTROL_CMD_ACCEPT, 0);
1446
1447         /* commit changes */
1448         ret = cdns_config_update(cdns);
1449         if (ret < 0) {
1450                 dev_err(cdns->dev, "%s: config_update failed\n", __func__);
1451                 return ret;
1452         }
1453
1454         /* Prepare slaves for clock stop */
1455         if (slave_present) {
1456                 ret = sdw_bus_prep_clk_stop(&cdns->bus);
1457                 if (ret < 0 && ret != -ENODATA) {
1458                         dev_err(cdns->dev, "prepare clock stop failed %d\n", ret);
1459                         return ret;
1460                 }
1461         }
1462
1463         /*
1464          * Enter clock stop mode and only report errors if there are
1465          * Slave devices present (ALERT or ATTACHED)
1466          */
1467         ret = sdw_bus_clk_stop(&cdns->bus);
1468         if (ret < 0 && slave_present && ret != -ENODATA) {
1469                 dev_err(cdns->dev, "bus clock stop failed %d", ret);
1470                 return ret;
1471         }
1472
1473         ret = cdns_set_wait(cdns, CDNS_MCP_STAT,
1474                             CDNS_MCP_STAT_CLK_STOP,
1475                             CDNS_MCP_STAT_CLK_STOP);
1476         if (ret < 0)
1477                 dev_err(cdns->dev, "Clock stop failed %d\n", ret);
1478
1479         return ret;
1480 }
1481 EXPORT_SYMBOL(sdw_cdns_clock_stop);
1482
1483 /**
1484  * sdw_cdns_clock_restart: Cadence PM clock restart configuration routine
1485  *
1486  * @cdns: Cadence instance
1487  * @bus_reset: context may be lost while in low power modes and the bus
1488  * may require a Severe Reset and re-enumeration after a wake.
1489  */
1490 int sdw_cdns_clock_restart(struct sdw_cdns *cdns, bool bus_reset)
1491 {
1492         int ret;
1493
1494         /* unmask Slave interrupts that were masked when stopping the clock */
1495         cdns_enable_slave_interrupts(cdns, true);
1496
1497         ret = cdns_clear_bit(cdns, CDNS_MCP_CONTROL,
1498                              CDNS_MCP_CONTROL_CLK_STOP_CLR);
1499         if (ret < 0) {
1500                 dev_err(cdns->dev, "Couldn't exit from clock stop\n");
1501                 return ret;
1502         }
1503
1504         ret = cdns_set_wait(cdns, CDNS_MCP_STAT, CDNS_MCP_STAT_CLK_STOP, 0);
1505         if (ret < 0) {
1506                 dev_err(cdns->dev, "clock stop exit failed %d\n", ret);
1507                 return ret;
1508         }
1509
1510         cdns_updatel(cdns, CDNS_MCP_CONTROL,
1511                      CDNS_MCP_CONTROL_BLOCK_WAKEUP, 0);
1512
1513         /*
1514          * clear CMD_ACCEPT so that the command ignored
1515          * will be treated as a failure during a broadcast write
1516          */
1517         cdns_updatel(cdns, CDNS_MCP_CONTROL, CDNS_MCP_CONTROL_CMD_ACCEPT, 0);
1518
1519         if (!bus_reset) {
1520
1521                 /* enable bus operations with clock and data */
1522                 cdns_updatel(cdns, CDNS_MCP_CONFIG,
1523                              CDNS_MCP_CONFIG_OP,
1524                              CDNS_MCP_CONFIG_OP_NORMAL);
1525
1526                 ret = cdns_config_update(cdns);
1527                 if (ret < 0) {
1528                         dev_err(cdns->dev, "%s: config_update failed\n", __func__);
1529                         return ret;
1530                 }
1531
1532                 ret = sdw_bus_exit_clk_stop(&cdns->bus);
1533                 if (ret < 0)
1534                         dev_err(cdns->dev, "bus failed to exit clock stop %d\n", ret);
1535         }
1536
1537         return ret;
1538 }
1539 EXPORT_SYMBOL(sdw_cdns_clock_restart);
1540
1541 /**
1542  * sdw_cdns_probe() - Cadence probe routine
1543  * @cdns: Cadence instance
1544  */
1545 int sdw_cdns_probe(struct sdw_cdns *cdns)
1546 {
1547         init_completion(&cdns->tx_complete);
1548         cdns->bus.port_ops = &cdns_port_ops;
1549
1550         INIT_WORK(&cdns->work, cdns_update_slave_status_work);
1551         return 0;
1552 }
1553 EXPORT_SYMBOL(sdw_cdns_probe);
1554
1555 int cdns_set_sdw_stream(struct snd_soc_dai *dai,
1556                         void *stream, bool pcm, int direction)
1557 {
1558         struct sdw_cdns *cdns = snd_soc_dai_get_drvdata(dai);
1559         struct sdw_cdns_dma_data *dma;
1560
1561         if (stream) {
1562                 /* first paranoia check */
1563                 if (direction == SNDRV_PCM_STREAM_PLAYBACK)
1564                         dma = dai->playback_dma_data;
1565                 else
1566                         dma = dai->capture_dma_data;
1567
1568                 if (dma) {
1569                         dev_err(dai->dev,
1570                                 "dma_data already allocated for dai %s\n",
1571                                 dai->name);
1572                         return -EINVAL;
1573                 }
1574
1575                 /* allocate and set dma info */
1576                 dma = kzalloc(sizeof(*dma), GFP_KERNEL);
1577                 if (!dma)
1578                         return -ENOMEM;
1579
1580                 if (pcm)
1581                         dma->stream_type = SDW_STREAM_PCM;
1582                 else
1583                         dma->stream_type = SDW_STREAM_PDM;
1584
1585                 dma->bus = &cdns->bus;
1586                 dma->link_id = cdns->instance;
1587
1588                 dma->stream = stream;
1589
1590                 if (direction == SNDRV_PCM_STREAM_PLAYBACK)
1591                         dai->playback_dma_data = dma;
1592                 else
1593                         dai->capture_dma_data = dma;
1594         } else {
1595                 /* for NULL stream we release allocated dma_data */
1596                 if (direction == SNDRV_PCM_STREAM_PLAYBACK) {
1597                         kfree(dai->playback_dma_data);
1598                         dai->playback_dma_data = NULL;
1599                 } else {
1600                         kfree(dai->capture_dma_data);
1601                         dai->capture_dma_data = NULL;
1602                 }
1603         }
1604         return 0;
1605 }
1606 EXPORT_SYMBOL(cdns_set_sdw_stream);
1607
1608 /**
1609  * cdns_find_pdi() - Find a free PDI
1610  *
1611  * @cdns: Cadence instance
1612  * @offset: Starting offset
1613  * @num: Number of PDIs
1614  * @pdi: PDI instances
1615  * @dai_id: DAI id
1616  *
1617  * Find a PDI for a given PDI array. The PDI num and dai_id are
1618  * expected to match, return NULL otherwise.
1619  */
1620 static struct sdw_cdns_pdi *cdns_find_pdi(struct sdw_cdns *cdns,
1621                                           unsigned int offset,
1622                                           unsigned int num,
1623                                           struct sdw_cdns_pdi *pdi,
1624                                           int dai_id)
1625 {
1626         int i;
1627
1628         for (i = offset; i < offset + num; i++)
1629                 if (pdi[i].num == dai_id)
1630                         return &pdi[i];
1631
1632         return NULL;
1633 }
1634
1635 /**
1636  * sdw_cdns_config_stream: Configure a stream
1637  *
1638  * @cdns: Cadence instance
1639  * @ch: Channel count
1640  * @dir: Data direction
1641  * @pdi: PDI to be used
1642  */
1643 void sdw_cdns_config_stream(struct sdw_cdns *cdns,
1644                             u32 ch, u32 dir, struct sdw_cdns_pdi *pdi)
1645 {
1646         u32 offset, val = 0;
1647
1648         if (dir == SDW_DATA_DIR_RX) {
1649                 val = CDNS_PORTCTRL_DIRN;
1650
1651                 if (cdns->bus.params.m_data_mode != SDW_PORT_DATA_MODE_NORMAL)
1652                         val |= CDNS_PORTCTRL_TEST_FAILED;
1653         }
1654         offset = CDNS_PORTCTRL + pdi->num * CDNS_PORT_OFFSET;
1655         cdns_updatel(cdns, offset,
1656                      CDNS_PORTCTRL_DIRN | CDNS_PORTCTRL_TEST_FAILED,
1657                      val);
1658
1659         val = pdi->num;
1660         val |= CDNS_PDI_CONFIG_SOFT_RESET;
1661         val |= FIELD_PREP(CDNS_PDI_CONFIG_CHANNEL, (1 << ch) - 1);
1662         cdns_writel(cdns, CDNS_PDI_CONFIG(pdi->num), val);
1663 }
1664 EXPORT_SYMBOL(sdw_cdns_config_stream);
1665
1666 /**
1667  * sdw_cdns_alloc_pdi() - Allocate a PDI
1668  *
1669  * @cdns: Cadence instance
1670  * @stream: Stream to be allocated
1671  * @ch: Channel count
1672  * @dir: Data direction
1673  * @dai_id: DAI id
1674  */
1675 struct sdw_cdns_pdi *sdw_cdns_alloc_pdi(struct sdw_cdns *cdns,
1676                                         struct sdw_cdns_streams *stream,
1677                                         u32 ch, u32 dir, int dai_id)
1678 {
1679         struct sdw_cdns_pdi *pdi = NULL;
1680
1681         if (dir == SDW_DATA_DIR_RX)
1682                 pdi = cdns_find_pdi(cdns, 0, stream->num_in, stream->in,
1683                                     dai_id);
1684         else
1685                 pdi = cdns_find_pdi(cdns, 0, stream->num_out, stream->out,
1686                                     dai_id);
1687
1688         /* check if we found a PDI, else find in bi-directional */
1689         if (!pdi)
1690                 pdi = cdns_find_pdi(cdns, 2, stream->num_bd, stream->bd,
1691                                     dai_id);
1692
1693         if (pdi) {
1694                 pdi->l_ch_num = 0;
1695                 pdi->h_ch_num = ch - 1;
1696                 pdi->dir = dir;
1697                 pdi->ch_count = ch;
1698         }
1699
1700         return pdi;
1701 }
1702 EXPORT_SYMBOL(sdw_cdns_alloc_pdi);
1703
1704 MODULE_LICENSE("Dual BSD/GPL");
1705 MODULE_DESCRIPTION("Cadence Soundwire Library");