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                         500
 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_vdbg(cdns->dev, "Msg Ack not received, cmd %d\n", i);
 487                 }
 488                 if (cdns->response_buf[i] & CDNS_MCP_RESP_NACK) {
 489                         nack = 1;
 490                         dev_err_ratelimited(cdns->dev, "Msg NACK received, cmd %d\n", i);
 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         /* fill response */
 505         for (i = 0; i < count; i++)
 506                 msg->buf[i + offset] = FIELD_GET(CDNS_MCP_RESP_RDATA, cdns->response_buf[i]);
 507
 508         return SDW_CMD_OK;
 509 }
 510
 511 static enum sdw_command_response
 512 _cdns_xfer_msg(struct sdw_cdns *cdns, struct sdw_msg *msg, int cmd,
 513                int offset, int count, bool defer)
 514 {
 515         unsigned long time;
 516         u32 base, i, data;
 517         u16 addr;
 518
 519         /* Program the watermark level for RX FIFO */
 520         if (cdns->msg_count != count) {
 521                 cdns_writel(cdns, CDNS_MCP_FIFOLEVEL, count);
 522                 cdns->msg_count = count;
 523         }
 524
 525         base = CDNS_MCP_CMD_BASE;
 526         addr = msg->addr;
 527
 528         for (i = 0; i < count; i++) {
 529                 data = FIELD_PREP(CDNS_MCP_CMD_DEV_ADDR, msg->dev_num);
 530                 data |= FIELD_PREP(CDNS_MCP_CMD_COMMAND, cmd);
 531                 data |= FIELD_PREP(CDNS_MCP_CMD_REG_ADDR, addr);
 532                 addr++;
 533
 534                 if (msg->flags == SDW_MSG_FLAG_WRITE)
 535                         data |= msg->buf[i + offset];
 536
 537                 data |= FIELD_PREP(CDNS_MCP_CMD_SSP_TAG, msg->ssp_sync);
 538                 cdns_writel(cdns, base, data);
 539                 base += CDNS_MCP_CMD_WORD_LEN;
 540         }
 541
 542         if (defer)
 543                 return SDW_CMD_OK;
 544
 545         /* wait for timeout or response */
 546         time = wait_for_completion_timeout(&cdns->tx_complete,
 547                                            msecs_to_jiffies(CDNS_TX_TIMEOUT));
 548         if (!time) {
 549                 dev_err(cdns->dev, "IO transfer timed out, cmd %d device %d addr %x len %d\n",
 550                         cmd, msg->dev_num, msg->addr, msg->len);
 551                 msg->len = 0;
 552                 return SDW_CMD_TIMEOUT;
 553         }
 554
 555         return cdns_fill_msg_resp(cdns, msg, count, offset);
 556 }
 557
 558 static enum sdw_command_response
 559 cdns_program_scp_addr(struct sdw_cdns *cdns, struct sdw_msg *msg)
 560 {
 561         int nack = 0, no_ack = 0;
 562         unsigned long time;
 563         u32 data[2], base;
 564         int i;
 565
 566         /* Program the watermark level for RX FIFO */
 567         if (cdns->msg_count != CDNS_SCP_RX_FIFOLEVEL) {
 568                 cdns_writel(cdns, CDNS_MCP_FIFOLEVEL, CDNS_SCP_RX_FIFOLEVEL);
 569                 cdns->msg_count = CDNS_SCP_RX_FIFOLEVEL;
 570         }
 571
 572         data[0] = FIELD_PREP(CDNS_MCP_CMD_DEV_ADDR, msg->dev_num);
 573         data[0] |= FIELD_PREP(CDNS_MCP_CMD_COMMAND, 0x3);
 574         data[1] = data[0];
 575
 576         data[0] |= FIELD_PREP(CDNS_MCP_CMD_REG_ADDR, SDW_SCP_ADDRPAGE1);
 577         data[1] |= FIELD_PREP(CDNS_MCP_CMD_REG_ADDR, SDW_SCP_ADDRPAGE2);
 578
 579         data[0] |= msg->addr_page1;
 580         data[1] |= msg->addr_page2;
 581
 582         base = CDNS_MCP_CMD_BASE;
 583         cdns_writel(cdns, base, data[0]);
 584         base += CDNS_MCP_CMD_WORD_LEN;
 585         cdns_writel(cdns, base, data[1]);
 586
 587         time = wait_for_completion_timeout(&cdns->tx_complete,
 588                                            msecs_to_jiffies(CDNS_TX_TIMEOUT));
 589         if (!time) {
 590                 dev_err(cdns->dev, "SCP Msg trf timed out\n");
 591                 msg->len = 0;
 592                 return SDW_CMD_TIMEOUT;
 593         }
 594
 595         /* check response the writes */
 596         for (i = 0; i < 2; i++) {
 597                 if (!(cdns->response_buf[i] & CDNS_MCP_RESP_ACK)) {
 598                         no_ack = 1;
 599                         dev_err(cdns->dev, "Program SCP Ack not received\n");
 600                         if (cdns->response_buf[i] & CDNS_MCP_RESP_NACK) {
 601                                 nack = 1;
 602                                 dev_err(cdns->dev, "Program SCP NACK received\n");
 603                         }
 604                 }
 605         }
 606
 607         /* For NACK, NO ack, don't return err if we are in Broadcast mode */
 608         if (nack) {
 609                 dev_err_ratelimited(cdns->dev,
 610                                     "SCP_addrpage NACKed for Slave %d\n", msg->dev_num);
 611                 return SDW_CMD_FAIL;
 612         }
 613
 614         if (no_ack) {
 615                 dev_dbg_ratelimited(cdns->dev,
 616                                     "SCP_addrpage ignored for Slave %d\n", msg->dev_num);
 617                 return SDW_CMD_IGNORED;
 618         }
 619
 620         return SDW_CMD_OK;
 621 }
 622
 623 static int cdns_prep_msg(struct sdw_cdns *cdns, struct sdw_msg *msg, int *cmd)
 624 {
 625         int ret;
 626
 627         if (msg->page) {
 628                 ret = cdns_program_scp_addr(cdns, msg);
 629                 if (ret) {
 630                         msg->len = 0;
 631                         return ret;
 632                 }
 633         }
 634
 635         switch (msg->flags) {
 636         case SDW_MSG_FLAG_READ:
 637                 *cmd = CDNS_MCP_CMD_READ;
 638                 break;
 639
 640         case SDW_MSG_FLAG_WRITE:
 641                 *cmd = CDNS_MCP_CMD_WRITE;
 642                 break;
 643
 644         default:
 645                 dev_err(cdns->dev, "Invalid msg cmd: %d\n", msg->flags);
 646                 return -EINVAL;
 647         }
 648
 649         return 0;
 650 }
 651
 652 enum sdw_command_response
 653 cdns_xfer_msg(struct sdw_bus *bus, struct sdw_msg *msg)
 654 {
 655         struct sdw_cdns *cdns = bus_to_cdns(bus);
 656         int cmd = 0, ret, i;
 657
 658         ret = cdns_prep_msg(cdns, msg, &cmd);
 659         if (ret)
 660                 return SDW_CMD_FAIL_OTHER;
 661
 662         for (i = 0; i < msg->len / CDNS_MCP_CMD_LEN; i++) {
 663                 ret = _cdns_xfer_msg(cdns, msg, cmd, i * CDNS_MCP_CMD_LEN,
 664                                      CDNS_MCP_CMD_LEN, false);
 665                 if (ret < 0)
 666                         goto exit;
 667         }
 668
 669         if (!(msg->len % CDNS_MCP_CMD_LEN))
 670                 goto exit;
 671
 672         ret = _cdns_xfer_msg(cdns, msg, cmd, i * CDNS_MCP_CMD_LEN,
 673                              msg->len % CDNS_MCP_CMD_LEN, false);
 674
 675 exit:
 676         return ret;
 677 }
 678 EXPORT_SYMBOL(cdns_xfer_msg);
 679
 680 enum sdw_command_response
 681 cdns_xfer_msg_defer(struct sdw_bus *bus,
 682                     struct sdw_msg *msg, struct sdw_defer *defer)
 683 {
 684         struct sdw_cdns *cdns = bus_to_cdns(bus);
 685         int cmd = 0, ret;
 686
 687         /* for defer only 1 message is supported */
 688         if (msg->len > 1)
 689                 return -ENOTSUPP;
 690
 691         ret = cdns_prep_msg(cdns, msg, &cmd);
 692         if (ret)
 693                 return SDW_CMD_FAIL_OTHER;
 694
 695         cdns->defer = defer;
 696         cdns->defer->length = msg->len;
 697
 698         return _cdns_xfer_msg(cdns, msg, cmd, 0, msg->len, true);
 699 }
 700 EXPORT_SYMBOL(cdns_xfer_msg_defer);
 701
 702 enum sdw_command_response
 703 cdns_reset_page_addr(struct sdw_bus *bus, unsigned int dev_num)
 704 {
 705         struct sdw_cdns *cdns = bus_to_cdns(bus);
 706         struct sdw_msg msg;
 707
 708         /* Create dummy message with valid device number */
 709         memset(&msg, 0, sizeof(msg));
 710         msg.dev_num = dev_num;
 711
 712         return cdns_program_scp_addr(cdns, &msg);
 713 }
 714 EXPORT_SYMBOL(cdns_reset_page_addr);
 715
 716 /*
 717  * IRQ handling
 718  */
 719
 720 static void cdns_read_response(struct sdw_cdns *cdns)
 721 {
 722         u32 num_resp, cmd_base;
 723         int i;
 724
 725         num_resp = cdns_readl(cdns, CDNS_MCP_FIFOSTAT);
 726         num_resp &= CDNS_MCP_RX_FIFO_AVAIL;
 727
 728         cmd_base = CDNS_MCP_CMD_BASE;
 729
 730         for (i = 0; i < num_resp; i++) {
 731                 cdns->response_buf[i] = cdns_readl(cdns, cmd_base);
 732                 cmd_base += CDNS_MCP_CMD_WORD_LEN;
 733         }
 734 }
 735
 736 static int cdns_update_slave_status(struct sdw_cdns *cdns,
 737                                     u64 slave_intstat)
 738 {
 739         enum sdw_slave_status status[SDW_MAX_DEVICES + 1];
 740         bool is_slave = false;
 741         u32 mask;
 742         int i, set_status;
 743
 744         memset(status, 0, sizeof(status));
 745
 746         for (i = 0; i <= SDW_MAX_DEVICES; i++) {
 747                 mask = (slave_intstat >> (i * CDNS_MCP_SLAVE_STATUS_NUM)) &
 748                         CDNS_MCP_SLAVE_STATUS_BITS;
 749                 if (!mask)
 750                         continue;
 751
 752                 is_slave = true;
 753                 set_status = 0;
 754
 755                 if (mask & CDNS_MCP_SLAVE_INTSTAT_RESERVED) {
 756                         status[i] = SDW_SLAVE_RESERVED;
 757                         set_status++;
 758                 }
 759
 760                 if (mask & CDNS_MCP_SLAVE_INTSTAT_ATTACHED) {
 761                         status[i] = SDW_SLAVE_ATTACHED;
 762                         set_status++;
 763                 }
 764
 765                 if (mask & CDNS_MCP_SLAVE_INTSTAT_ALERT) {
 766                         status[i] = SDW_SLAVE_ALERT;
 767                         set_status++;
 768                 }
 769
 770                 if (mask & CDNS_MCP_SLAVE_INTSTAT_NPRESENT) {
 771                         status[i] = SDW_SLAVE_UNATTACHED;
 772                         set_status++;
 773                 }
 774
 775                 /* first check if Slave reported multiple status */
 776                 if (set_status > 1) {
 777                         u32 val;
 778
 779                         dev_warn_ratelimited(cdns->dev,
 780                                              "Slave %d reported multiple Status: %d\n",
 781                                              i, mask);
 782
 783                         /* check latest status extracted from PING commands */
 784                         val = cdns_readl(cdns, CDNS_MCP_SLAVE_STAT);
 785                         val >>= (i * 2);
 786
 787                         switch (val & 0x3) {
 788                         case 0:
 789                                 status[i] = SDW_SLAVE_UNATTACHED;
 790                                 break;
 791                         case 1:
 792                                 status[i] = SDW_SLAVE_ATTACHED;
 793                                 break;
 794                         case 2:
 795                                 status[i] = SDW_SLAVE_ALERT;
 796                                 break;
 797                         case 3:
 798                         default:
 799                                 status[i] = SDW_SLAVE_RESERVED;
 800                                 break;
 801                         }
 802
 803                         dev_warn_ratelimited(cdns->dev,
 804                                              "Slave %d status updated to %d\n",
 805                                              i, status[i]);
 806
 807                 }
 808         }
 809
 810         if (is_slave)
 811                 return sdw_handle_slave_status(&cdns->bus, status);
 812
 813         return 0;
 814 }
 815
 816 /**
 817  * sdw_cdns_irq() - Cadence interrupt handler
 818  * @irq: irq number
 819  * @dev_id: irq context
 820  */
 821 irqreturn_t sdw_cdns_irq(int irq, void *dev_id)
 822 {
 823         struct sdw_cdns *cdns = dev_id;
 824         u32 int_status;
 825         int ret = IRQ_HANDLED;
 826
 827         /* Check if the link is up */
 828         if (!cdns->link_up)
 829                 return IRQ_NONE;
 830
 831         int_status = cdns_readl(cdns, CDNS_MCP_INTSTAT);
 832
 833         /* check for reserved values read as zero */
 834         if (int_status & CDNS_MCP_INT_RESERVED)
 835                 return IRQ_NONE;
 836
 837         if (!(int_status & CDNS_MCP_INT_IRQ))
 838                 return IRQ_NONE;
 839
 840         if (int_status & CDNS_MCP_INT_RX_WL) {
 841                 cdns_read_response(cdns);
 842
 843                 if (cdns->defer) {
 844                         cdns_fill_msg_resp(cdns, cdns->defer->msg,
 845                                            cdns->defer->length, 0);
 846                         complete(&cdns->defer->complete);
 847                         cdns->defer = NULL;
 848                 } else {
 849                         complete(&cdns->tx_complete);
 850                 }
 851         }
 852
 853         if (int_status & CDNS_MCP_INT_PARITY) {
 854                 /* Parity error detected by Master */
 855                 dev_err_ratelimited(cdns->dev, "Parity error\n");
 856         }
 857
 858         if (int_status & CDNS_MCP_INT_CTRL_CLASH) {
 859                 /* Slave is driving bit slot during control word */
 860                 dev_err_ratelimited(cdns->dev, "Bus clash for control word\n");
 861         }
 862
 863         if (int_status & CDNS_MCP_INT_DATA_CLASH) {
 864                 /*
 865                  * Multiple slaves trying to drive bit slot, or issue with
 866                  * ownership of data bits or Slave gone bonkers
 867                  */
 868                 dev_err_ratelimited(cdns->dev, "Bus clash for data word\n");
 869         }
 870
 871         if (cdns->bus.params.m_data_mode != SDW_PORT_DATA_MODE_NORMAL &&
 872             int_status & CDNS_MCP_INT_DPINT) {
 873                 u32 port_intstat;
 874
 875                 /* just log which ports report an error */
 876                 port_intstat = cdns_readl(cdns, CDNS_MCP_PORT_INTSTAT);
 877                 dev_err_ratelimited(cdns->dev, "DP interrupt: PortIntStat %8x\n",
 878                                     port_intstat);
 879
 880                 /* clear status w/ write1 */
 881                 cdns_writel(cdns, CDNS_MCP_PORT_INTSTAT, port_intstat);
 882         }
 883
 884         if (int_status & CDNS_MCP_INT_SLAVE_MASK) {
 885                 /* Mask the Slave interrupt and wake thread */
 886                 cdns_updatel(cdns, CDNS_MCP_INTMASK,
 887                              CDNS_MCP_INT_SLAVE_MASK, 0);
 888
 889                 int_status &= ~CDNS_MCP_INT_SLAVE_MASK;
 890
 891                 /*
 892                  * Deal with possible race condition between interrupt
 893                  * handling and disabling interrupts on suspend.
 894                  *
 895                  * If the master is in the process of disabling
 896                  * interrupts, don't schedule a workqueue
 897                  */
 898                 if (cdns->interrupt_enabled)
 899                         schedule_work(&cdns->work);
 900         }
 901
 902         cdns_writel(cdns, CDNS_MCP_INTSTAT, int_status);
 903         return ret;
 904 }
 905 EXPORT_SYMBOL(sdw_cdns_irq);
 906
 907 /**
 908  * cdns_update_slave_status_work - update slave status in a work since we will need to handle
 909  * other interrupts eg. CDNS_MCP_INT_RX_WL during the update slave
 910  * process.
 911  * @work: cdns worker thread
 912  */
 913 static void cdns_update_slave_status_work(struct work_struct *work)
 914 {
 915         struct sdw_cdns *cdns =
 916                 container_of(work, struct sdw_cdns, work);
 917         u32 slave0, slave1;
 918         u64 slave_intstat;
 919
 920         slave0 = cdns_readl(cdns, CDNS_MCP_SLAVE_INTSTAT0);
 921         slave1 = cdns_readl(cdns, CDNS_MCP_SLAVE_INTSTAT1);
 922
 923         /* combine the two status */
 924         slave_intstat = ((u64)slave1 << 32) | slave0;
 925
 926         dev_dbg_ratelimited(cdns->dev, "Slave status change: 0x%llx\n", slave_intstat);
 927
 928         cdns_update_slave_status(cdns, slave_intstat);
 929         cdns_writel(cdns, CDNS_MCP_SLAVE_INTSTAT0, slave0);
 930         cdns_writel(cdns, CDNS_MCP_SLAVE_INTSTAT1, slave1);
 931
 932         /* clear and unmask Slave interrupt now */
 933         cdns_writel(cdns, CDNS_MCP_INTSTAT, CDNS_MCP_INT_SLAVE_MASK);
 934         cdns_updatel(cdns, CDNS_MCP_INTMASK,
 935                      CDNS_MCP_INT_SLAVE_MASK, CDNS_MCP_INT_SLAVE_MASK);
 936
 937 }
 938
 939 /*
 940  * init routines
 941  */
 942
 943 /**
 944  * sdw_cdns_exit_reset() - Program reset parameters and start bus operations
 945  * @cdns: Cadence instance
 946  */
 947 int sdw_cdns_exit_reset(struct sdw_cdns *cdns)
 948 {
 949         /* program maximum length reset to be safe */
 950         cdns_updatel(cdns, CDNS_MCP_CONTROL,
 951                      CDNS_MCP_CONTROL_RST_DELAY,
 952                      CDNS_MCP_CONTROL_RST_DELAY);
 953
 954         /* use hardware generated reset */
 955         cdns_updatel(cdns, CDNS_MCP_CONTROL,
 956                      CDNS_MCP_CONTROL_HW_RST,
 957                      CDNS_MCP_CONTROL_HW_RST);
 958
 959         /* commit changes */
 960         cdns_updatel(cdns, CDNS_MCP_CONFIG_UPDATE,
 961                      CDNS_MCP_CONFIG_UPDATE_BIT,
 962                      CDNS_MCP_CONFIG_UPDATE_BIT);
 963
 964         /* don't wait here */
 965         return 0;
 966
 967 }
 968 EXPORT_SYMBOL(sdw_cdns_exit_reset);
 969
 970 /**
 971  * cdns_enable_slave_interrupts() - Enable SDW slave interrupts
 972  * @cdns: Cadence instance
 973  * @state: boolean for true/false
 974  */
 975 static void cdns_enable_slave_interrupts(struct sdw_cdns *cdns, bool state)
 976 {
 977         u32 mask;
 978
 979         mask = cdns_readl(cdns, CDNS_MCP_INTMASK);
 980         if (state)
 981                 mask |= CDNS_MCP_INT_SLAVE_MASK;
 982         else
 983                 mask &= ~CDNS_MCP_INT_SLAVE_MASK;
 984
 985         cdns_writel(cdns, CDNS_MCP_INTMASK, mask);
 986 }
 987
 988 /**
 989  * sdw_cdns_enable_interrupt() - Enable SDW interrupts
 990  * @cdns: Cadence instance
 991  * @state: True if we are trying to enable interrupt.
 992  */
 993 int sdw_cdns_enable_interrupt(struct sdw_cdns *cdns, bool state)
 994 {
 995         u32 slave_intmask0 = 0;
 996         u32 slave_intmask1 = 0;
 997         u32 mask = 0;
 998
 999         if (!state)
1000                 goto update_masks;
1001
1002         slave_intmask0 = CDNS_MCP_SLAVE_INTMASK0_MASK;
1003         slave_intmask1 = CDNS_MCP_SLAVE_INTMASK1_MASK;
1004
1005         /* enable detection of all slave state changes */
1006         mask = CDNS_MCP_INT_SLAVE_MASK;
1007
1008         /* enable detection of bus issues */
1009         mask |= CDNS_MCP_INT_CTRL_CLASH | CDNS_MCP_INT_DATA_CLASH |
1010                 CDNS_MCP_INT_PARITY;
1011
1012         /* port interrupt limited to test modes for now */
1013         if (cdns->bus.params.m_data_mode != SDW_PORT_DATA_MODE_NORMAL)
1014                 mask |= CDNS_MCP_INT_DPINT;
1015
1016         /* enable detection of RX fifo level */
1017         mask |= CDNS_MCP_INT_RX_WL;
1018
1019         /*
1020          * CDNS_MCP_INT_IRQ needs to be set otherwise all previous
1021          * settings are irrelevant
1022          */
1023         mask |= CDNS_MCP_INT_IRQ;
1024
1025         if (interrupt_mask) /* parameter override */
1026                 mask = interrupt_mask;
1027
1028 update_masks:
1029         /* clear slave interrupt status before enabling interrupt */
1030         if (state) {
1031                 u32 slave_state;
1032
1033                 slave_state = cdns_readl(cdns, CDNS_MCP_SLAVE_INTSTAT0);
1034                 cdns_writel(cdns, CDNS_MCP_SLAVE_INTSTAT0, slave_state);
1035                 slave_state = cdns_readl(cdns, CDNS_MCP_SLAVE_INTSTAT1);
1036                 cdns_writel(cdns, CDNS_MCP_SLAVE_INTSTAT1, slave_state);
1037         }
1038         cdns->interrupt_enabled = state;
1039
1040         /*
1041          * Complete any on-going status updates before updating masks,
1042          * and cancel queued status updates.
1043          *
1044          * There could be a race with a new interrupt thrown before
1045          * the 3 mask updates below are complete, so in the interrupt
1046          * we use the 'interrupt_enabled' status to prevent new work
1047          * from being queued.
1048          */
1049         if (!state)
1050                 cancel_work_sync(&cdns->work);
1051
1052         cdns_writel(cdns, CDNS_MCP_SLAVE_INTMASK0, slave_intmask0);
1053         cdns_writel(cdns, CDNS_MCP_SLAVE_INTMASK1, slave_intmask1);
1054         cdns_writel(cdns, CDNS_MCP_INTMASK, mask);
1055
1056         return 0;
1057 }
1058 EXPORT_SYMBOL(sdw_cdns_enable_interrupt);
1059
1060 static int cdns_allocate_pdi(struct sdw_cdns *cdns,
1061                              struct sdw_cdns_pdi **stream,
1062                              u32 num, u32 pdi_offset)
1063 {
1064         struct sdw_cdns_pdi *pdi;
1065         int i;
1066
1067         if (!num)
1068                 return 0;
1069
1070         pdi = devm_kcalloc(cdns->dev, num, sizeof(*pdi), GFP_KERNEL);
1071         if (!pdi)
1072                 return -ENOMEM;
1073
1074         for (i = 0; i < num; i++) {
1075                 pdi[i].num = i + pdi_offset;
1076         }
1077
1078         *stream = pdi;
1079         return 0;
1080 }
1081
1082 /**
1083  * sdw_cdns_pdi_init() - PDI initialization routine
1084  *
1085  * @cdns: Cadence instance
1086  * @config: Stream configurations
1087  */
1088 int sdw_cdns_pdi_init(struct sdw_cdns *cdns,
1089                       struct sdw_cdns_stream_config config)
1090 {
1091         struct sdw_cdns_streams *stream;
1092         int offset;
1093         int ret;
1094
1095         cdns->pcm.num_bd = config.pcm_bd;
1096         cdns->pcm.num_in = config.pcm_in;
1097         cdns->pcm.num_out = config.pcm_out;
1098         cdns->pdm.num_bd = config.pdm_bd;
1099         cdns->pdm.num_in = config.pdm_in;
1100         cdns->pdm.num_out = config.pdm_out;
1101
1102         /* Allocate PDIs for PCMs */
1103         stream = &cdns->pcm;
1104
1105         /* we allocate PDI0 and PDI1 which are used for Bulk */
1106         offset = 0;
1107
1108         ret = cdns_allocate_pdi(cdns, &stream->bd,
1109                                 stream->num_bd, offset);
1110         if (ret)
1111                 return ret;
1112
1113         offset += stream->num_bd;
1114
1115         ret = cdns_allocate_pdi(cdns, &stream->in,
1116                                 stream->num_in, offset);
1117         if (ret)
1118                 return ret;
1119
1120         offset += stream->num_in;
1121
1122         ret = cdns_allocate_pdi(cdns, &stream->out,
1123                                 stream->num_out, offset);
1124         if (ret)
1125                 return ret;
1126
1127         /* Update total number of PCM PDIs */
1128         stream->num_pdi = stream->num_bd + stream->num_in + stream->num_out;
1129         cdns->num_ports = stream->num_pdi;
1130
1131         /* Allocate PDIs for PDMs */
1132         stream = &cdns->pdm;
1133         ret = cdns_allocate_pdi(cdns, &stream->bd,
1134                                 stream->num_bd, offset);
1135         if (ret)
1136                 return ret;
1137
1138         offset += stream->num_bd;
1139
1140         ret = cdns_allocate_pdi(cdns, &stream->in,
1141                                 stream->num_in, offset);
1142         if (ret)
1143                 return ret;
1144
1145         offset += stream->num_in;
1146
1147         ret = cdns_allocate_pdi(cdns, &stream->out,
1148                                 stream->num_out, offset);
1149
1150         if (ret)
1151                 return ret;
1152
1153         /* Update total number of PDM PDIs */
1154         stream->num_pdi = stream->num_bd + stream->num_in + stream->num_out;
1155         cdns->num_ports += stream->num_pdi;
1156
1157         return 0;
1158 }
1159 EXPORT_SYMBOL(sdw_cdns_pdi_init);
1160
1161 static u32 cdns_set_initial_frame_shape(int n_rows, int n_cols)
1162 {
1163         u32 val;
1164         int c;
1165         int r;
1166
1167         r = sdw_find_row_index(n_rows);
1168         c = sdw_find_col_index(n_cols);
1169
1170         val = FIELD_PREP(CDNS_MCP_FRAME_SHAPE_ROW_MASK, r);
1171         val |= FIELD_PREP(CDNS_MCP_FRAME_SHAPE_COL_MASK, c);
1172
1173         return val;
1174 }
1175
1176 static void cdns_init_clock_ctrl(struct sdw_cdns *cdns)
1177 {
1178         struct sdw_bus *bus = &cdns->bus;
1179         struct sdw_master_prop *prop = &bus->prop;
1180         u32 val;
1181         u32 ssp_interval;
1182         int divider;
1183
1184         /* Set clock divider */
1185         divider = (prop->mclk_freq / prop->max_clk_freq) - 1;
1186
1187         cdns_updatel(cdns, CDNS_MCP_CLK_CTRL0,
1188                      CDNS_MCP_CLK_MCLKD_MASK, divider);
1189         cdns_updatel(cdns, CDNS_MCP_CLK_CTRL1,
1190                      CDNS_MCP_CLK_MCLKD_MASK, divider);
1191
1192         /*
1193          * Frame shape changes after initialization have to be done
1194          * with the bank switch mechanism
1195          */
1196         val = cdns_set_initial_frame_shape(prop->default_row,
1197                                            prop->default_col);
1198         cdns_writel(cdns, CDNS_MCP_FRAME_SHAPE_INIT, val);
1199
1200         /* Set SSP interval to default value */
1201         ssp_interval = prop->default_frame_rate / SDW_CADENCE_GSYNC_HZ;
1202         cdns_writel(cdns, CDNS_MCP_SSP_CTRL0, ssp_interval);
1203         cdns_writel(cdns, CDNS_MCP_SSP_CTRL1, ssp_interval);
1204 }
1205
1206 /**
1207  * sdw_cdns_init() - Cadence initialization
1208  * @cdns: Cadence instance
1209  */
1210 int sdw_cdns_init(struct sdw_cdns *cdns)
1211 {
1212         u32 val;
1213
1214         cdns_init_clock_ctrl(cdns);
1215
1216         /* reset msg_count to default value of FIFOLEVEL */
1217         cdns->msg_count = cdns_readl(cdns, CDNS_MCP_FIFOLEVEL);
1218
1219         /* flush command FIFOs */
1220         cdns_updatel(cdns, CDNS_MCP_CONTROL, CDNS_MCP_CONTROL_CMD_RST,
1221                      CDNS_MCP_CONTROL_CMD_RST);
1222
1223         /* Set cmd accept mode */
1224         cdns_updatel(cdns, CDNS_MCP_CONTROL, CDNS_MCP_CONTROL_CMD_ACCEPT,
1225                      CDNS_MCP_CONTROL_CMD_ACCEPT);
1226
1227         /* Configure mcp config */
1228         val = cdns_readl(cdns, CDNS_MCP_CONFIG);
1229
1230         /* enable bus operations with clock and data */
1231         val &= ~CDNS_MCP_CONFIG_OP;
1232         val |= CDNS_MCP_CONFIG_OP_NORMAL;
1233
1234         /* Set cmd mode for Tx and Rx cmds */
1235         val &= ~CDNS_MCP_CONFIG_CMD;
1236
1237         /* Disable sniffer mode */
1238         val &= ~CDNS_MCP_CONFIG_SNIFFER;
1239
1240         /* Disable auto bus release */
1241         val &= ~CDNS_MCP_CONFIG_BUS_REL;
1242
1243         if (cdns->bus.multi_link)
1244                 /* Set Multi-master mode to take gsync into account */
1245                 val |= CDNS_MCP_CONFIG_MMASTER;
1246
1247         /* leave frame delay to hardware default of 0x1F */
1248
1249         /* leave command retry to hardware default of 0 */
1250
1251         cdns_writel(cdns, CDNS_MCP_CONFIG, val);
1252
1253         /* changes will be committed later */
1254         return 0;
1255 }
1256 EXPORT_SYMBOL(sdw_cdns_init);
1257
1258 int cdns_bus_conf(struct sdw_bus *bus, struct sdw_bus_params *params)
1259 {
1260         struct sdw_master_prop *prop = &bus->prop;
1261         struct sdw_cdns *cdns = bus_to_cdns(bus);
1262         int mcp_clkctrl_off;
1263         int divider;
1264
1265         if (!params->curr_dr_freq) {
1266                 dev_err(cdns->dev, "NULL curr_dr_freq\n");
1267                 return -EINVAL;
1268         }
1269
1270         divider = prop->mclk_freq * SDW_DOUBLE_RATE_FACTOR /
1271                 params->curr_dr_freq;
1272         divider--; /* divider is 1/(N+1) */
1273
1274         if (params->next_bank)
1275                 mcp_clkctrl_off = CDNS_MCP_CLK_CTRL1;
1276         else
1277                 mcp_clkctrl_off = CDNS_MCP_CLK_CTRL0;
1278
1279         cdns_updatel(cdns, mcp_clkctrl_off, CDNS_MCP_CLK_MCLKD_MASK, divider);
1280
1281         return 0;
1282 }
1283 EXPORT_SYMBOL(cdns_bus_conf);
1284
1285 static int cdns_port_params(struct sdw_bus *bus,
1286                             struct sdw_port_params *p_params, unsigned int bank)
1287 {
1288         struct sdw_cdns *cdns = bus_to_cdns(bus);
1289         int dpn_config = 0, dpn_config_off;
1290
1291         if (bank)
1292                 dpn_config_off = CDNS_DPN_B1_CONFIG(p_params->num);
1293         else
1294                 dpn_config_off = CDNS_DPN_B0_CONFIG(p_params->num);
1295
1296         dpn_config = cdns_readl(cdns, dpn_config_off);
1297
1298         u32p_replace_bits(&dpn_config, (p_params->bps - 1), CDNS_DPN_CONFIG_WL);
1299         u32p_replace_bits(&dpn_config, p_params->flow_mode, CDNS_DPN_CONFIG_PORT_FLOW);
1300         u32p_replace_bits(&dpn_config, p_params->data_mode, CDNS_DPN_CONFIG_PORT_DAT);
1301
1302         cdns_writel(cdns, dpn_config_off, dpn_config);
1303
1304         return 0;
1305 }
1306
1307 static int cdns_transport_params(struct sdw_bus *bus,
1308                                  struct sdw_transport_params *t_params,
1309                                  enum sdw_reg_bank bank)
1310 {
1311         struct sdw_cdns *cdns = bus_to_cdns(bus);
1312         int dpn_offsetctrl = 0, dpn_offsetctrl_off;
1313         int dpn_config = 0, dpn_config_off;
1314         int dpn_hctrl = 0, dpn_hctrl_off;
1315         int num = t_params->port_num;
1316         int dpn_samplectrl_off;
1317
1318         /*
1319          * Note: Only full data port is supported on the Master side for
1320          * both PCM and PDM ports.
1321          */
1322
1323         if (bank) {
1324                 dpn_config_off = CDNS_DPN_B1_CONFIG(num);
1325                 dpn_samplectrl_off = CDNS_DPN_B1_SAMPLE_CTRL(num);
1326                 dpn_hctrl_off = CDNS_DPN_B1_HCTRL(num);
1327                 dpn_offsetctrl_off = CDNS_DPN_B1_OFFSET_CTRL(num);
1328         } else {
1329                 dpn_config_off = CDNS_DPN_B0_CONFIG(num);
1330                 dpn_samplectrl_off = CDNS_DPN_B0_SAMPLE_CTRL(num);
1331                 dpn_hctrl_off = CDNS_DPN_B0_HCTRL(num);
1332                 dpn_offsetctrl_off = CDNS_DPN_B0_OFFSET_CTRL(num);
1333         }
1334
1335         dpn_config = cdns_readl(cdns, dpn_config_off);
1336         u32p_replace_bits(&dpn_config, t_params->blk_grp_ctrl, CDNS_DPN_CONFIG_BGC);
1337         u32p_replace_bits(&dpn_config, t_params->blk_pkg_mode, CDNS_DPN_CONFIG_BPM);
1338         cdns_writel(cdns, dpn_config_off, dpn_config);
1339
1340         u32p_replace_bits(&dpn_offsetctrl, t_params->offset1, CDNS_DPN_OFFSET_CTRL_1);
1341         u32p_replace_bits(&dpn_offsetctrl, t_params->offset2, CDNS_DPN_OFFSET_CTRL_2);
1342         cdns_writel(cdns, dpn_offsetctrl_off,  dpn_offsetctrl);
1343
1344         u32p_replace_bits(&dpn_hctrl, t_params->hstart, CDNS_DPN_HCTRL_HSTART);
1345         u32p_replace_bits(&dpn_hctrl, t_params->hstop, CDNS_DPN_HCTRL_HSTOP);
1346         u32p_replace_bits(&dpn_hctrl, t_params->lane_ctrl, CDNS_DPN_HCTRL_LCTRL);
1347
1348         cdns_writel(cdns, dpn_hctrl_off, dpn_hctrl);
1349         cdns_writel(cdns, dpn_samplectrl_off, (t_params->sample_interval - 1));
1350
1351         return 0;
1352 }
1353
1354 static int cdns_port_enable(struct sdw_bus *bus,
1355                             struct sdw_enable_ch *enable_ch, unsigned int bank)
1356 {
1357         struct sdw_cdns *cdns = bus_to_cdns(bus);
1358         int dpn_chnen_off, ch_mask;
1359
1360         if (bank)
1361                 dpn_chnen_off = CDNS_DPN_B1_CH_EN(enable_ch->port_num);
1362         else
1363                 dpn_chnen_off = CDNS_DPN_B0_CH_EN(enable_ch->port_num);
1364
1365         ch_mask = enable_ch->ch_mask * enable_ch->enable;
1366         cdns_writel(cdns, dpn_chnen_off, ch_mask);
1367
1368         return 0;
1369 }
1370
1371 static const struct sdw_master_port_ops cdns_port_ops = {
1372         .dpn_set_port_params = cdns_port_params,
1373         .dpn_set_port_transport_params = cdns_transport_params,
1374         .dpn_port_enable_ch = cdns_port_enable,
1375 };
1376
1377 /**
1378  * sdw_cdns_is_clock_stop: Check clock status
1379  *
1380  * @cdns: Cadence instance
1381  */
1382 bool sdw_cdns_is_clock_stop(struct sdw_cdns *cdns)
1383 {
1384         return !!(cdns_readl(cdns, CDNS_MCP_STAT) & CDNS_MCP_STAT_CLK_STOP);
1385 }
1386 EXPORT_SYMBOL(sdw_cdns_is_clock_stop);
1387
1388 /**
1389  * sdw_cdns_clock_stop: Cadence clock stop configuration routine
1390  *
1391  * @cdns: Cadence instance
1392  * @block_wake: prevent wakes if required by the platform
1393  */
1394 int sdw_cdns_clock_stop(struct sdw_cdns *cdns, bool block_wake)
1395 {
1396         bool slave_present = false;
1397         struct sdw_slave *slave;
1398         int ret;
1399
1400         /* Check suspend status */
1401         if (sdw_cdns_is_clock_stop(cdns)) {
1402                 dev_dbg(cdns->dev, "Clock is already stopped\n");
1403                 return 0;
1404         }
1405
1406         /*
1407          * Before entering clock stop we mask the Slave
1408          * interrupts. This helps avoid having to deal with e.g. a
1409          * Slave becoming UNATTACHED while the clock is being stopped
1410          */
1411         cdns_enable_slave_interrupts(cdns, false);
1412
1413         /*
1414          * For specific platforms, it is required to be able to put
1415          * master into a state in which it ignores wake-up trials
1416          * in clock stop state
1417          */
1418         if (block_wake)
1419                 cdns_updatel(cdns, CDNS_MCP_CONTROL,
1420                              CDNS_MCP_CONTROL_BLOCK_WAKEUP,
1421                              CDNS_MCP_CONTROL_BLOCK_WAKEUP);
1422
1423         list_for_each_entry(slave, &cdns->bus.slaves, node) {
1424                 if (slave->status == SDW_SLAVE_ATTACHED ||
1425                     slave->status == SDW_SLAVE_ALERT) {
1426                         slave_present = true;
1427                         break;
1428                 }
1429         }
1430
1431         /*
1432          * This CMD_ACCEPT should be used when there are no devices
1433          * attached on the link when entering clock stop mode. If this is
1434          * not set and there is a broadcast write then the command ignored
1435          * will be treated as a failure
1436          */
1437         if (!slave_present)
1438                 cdns_updatel(cdns, CDNS_MCP_CONTROL,
1439                              CDNS_MCP_CONTROL_CMD_ACCEPT,
1440                              CDNS_MCP_CONTROL_CMD_ACCEPT);
1441         else
1442                 cdns_updatel(cdns, CDNS_MCP_CONTROL,
1443                              CDNS_MCP_CONTROL_CMD_ACCEPT, 0);
1444
1445         /* commit changes */
1446         ret = cdns_config_update(cdns);
1447         if (ret < 0) {
1448                 dev_err(cdns->dev, "%s: config_update failed\n", __func__);
1449                 return ret;
1450         }
1451
1452         /* Prepare slaves for clock stop */
1453         if (slave_present) {
1454                 ret = sdw_bus_prep_clk_stop(&cdns->bus);
1455                 if (ret < 0 && ret != -ENODATA) {
1456                         dev_err(cdns->dev, "prepare clock stop failed %d\n", ret);
1457                         return ret;
1458                 }
1459         }
1460
1461         /*
1462          * Enter clock stop mode and only report errors if there are
1463          * Slave devices present (ALERT or ATTACHED)
1464          */
1465         ret = sdw_bus_clk_stop(&cdns->bus);
1466         if (ret < 0 && slave_present && ret != -ENODATA) {
1467                 dev_err(cdns->dev, "bus clock stop failed %d\n", ret);
1468                 return ret;
1469         }
1470
1471         ret = cdns_set_wait(cdns, CDNS_MCP_STAT,
1472                             CDNS_MCP_STAT_CLK_STOP,
1473                             CDNS_MCP_STAT_CLK_STOP);
1474         if (ret < 0)
1475                 dev_err(cdns->dev, "Clock stop failed %d\n", ret);
1476
1477         return ret;
1478 }
1479 EXPORT_SYMBOL(sdw_cdns_clock_stop);
1480
1481 /**
1482  * sdw_cdns_clock_restart: Cadence PM clock restart configuration routine
1483  *
1484  * @cdns: Cadence instance
1485  * @bus_reset: context may be lost while in low power modes and the bus
1486  * may require a Severe Reset and re-enumeration after a wake.
1487  */
1488 int sdw_cdns_clock_restart(struct sdw_cdns *cdns, bool bus_reset)
1489 {
1490         int ret;
1491
1492         /* unmask Slave interrupts that were masked when stopping the clock */
1493         cdns_enable_slave_interrupts(cdns, true);
1494
1495         ret = cdns_clear_bit(cdns, CDNS_MCP_CONTROL,
1496                              CDNS_MCP_CONTROL_CLK_STOP_CLR);
1497         if (ret < 0) {
1498                 dev_err(cdns->dev, "Couldn't exit from clock stop\n");
1499                 return ret;
1500         }
1501
1502         ret = cdns_set_wait(cdns, CDNS_MCP_STAT, CDNS_MCP_STAT_CLK_STOP, 0);
1503         if (ret < 0) {
1504                 dev_err(cdns->dev, "clock stop exit failed %d\n", ret);
1505                 return ret;
1506         }
1507
1508         cdns_updatel(cdns, CDNS_MCP_CONTROL,
1509                      CDNS_MCP_CONTROL_BLOCK_WAKEUP, 0);
1510
1511         /*
1512          * clear CMD_ACCEPT so that the command ignored
1513          * will be treated as a failure during a broadcast write
1514          */
1515         cdns_updatel(cdns, CDNS_MCP_CONTROL, CDNS_MCP_CONTROL_CMD_ACCEPT, 0);
1516
1517         if (!bus_reset) {
1518
1519                 /* enable bus operations with clock and data */
1520                 cdns_updatel(cdns, CDNS_MCP_CONFIG,
1521                              CDNS_MCP_CONFIG_OP,
1522                              CDNS_MCP_CONFIG_OP_NORMAL);
1523
1524                 ret = cdns_config_update(cdns);
1525                 if (ret < 0) {
1526                         dev_err(cdns->dev, "%s: config_update failed\n", __func__);
1527                         return ret;
1528                 }
1529
1530                 ret = sdw_bus_exit_clk_stop(&cdns->bus);
1531                 if (ret < 0)
1532                         dev_err(cdns->dev, "bus failed to exit clock stop %d\n", ret);
1533         }
1534
1535         return ret;
1536 }
1537 EXPORT_SYMBOL(sdw_cdns_clock_restart);
1538
1539 /**
1540  * sdw_cdns_probe() - Cadence probe routine
1541  * @cdns: Cadence instance
1542  */
1543 int sdw_cdns_probe(struct sdw_cdns *cdns)
1544 {
1545         init_completion(&cdns->tx_complete);
1546         cdns->bus.port_ops = &cdns_port_ops;
1547
1548         INIT_WORK(&cdns->work, cdns_update_slave_status_work);
1549         return 0;
1550 }
1551 EXPORT_SYMBOL(sdw_cdns_probe);
1552
1553 int cdns_set_sdw_stream(struct snd_soc_dai *dai,
1554                         void *stream, bool pcm, int direction)
1555 {
1556         struct sdw_cdns *cdns = snd_soc_dai_get_drvdata(dai);
1557         struct sdw_cdns_dma_data *dma;
1558
1559         if (stream) {
1560                 /* first paranoia check */
1561                 if (direction == SNDRV_PCM_STREAM_PLAYBACK)
1562                         dma = dai->playback_dma_data;
1563                 else
1564                         dma = dai->capture_dma_data;
1565
1566                 if (dma) {
1567                         dev_err(dai->dev,
1568                                 "dma_data already allocated for dai %s\n",
1569                                 dai->name);
1570                         return -EINVAL;
1571                 }
1572
1573                 /* allocate and set dma info */
1574                 dma = kzalloc(sizeof(*dma), GFP_KERNEL);
1575                 if (!dma)
1576                         return -ENOMEM;
1577
1578                 if (pcm)
1579                         dma->stream_type = SDW_STREAM_PCM;
1580                 else
1581                         dma->stream_type = SDW_STREAM_PDM;
1582
1583                 dma->bus = &cdns->bus;
1584                 dma->link_id = cdns->instance;
1585
1586                 dma->stream = stream;
1587
1588                 if (direction == SNDRV_PCM_STREAM_PLAYBACK)
1589                         dai->playback_dma_data = dma;
1590                 else
1591                         dai->capture_dma_data = dma;
1592         } else {
1593                 /* for NULL stream we release allocated dma_data */
1594                 if (direction == SNDRV_PCM_STREAM_PLAYBACK) {
1595                         kfree(dai->playback_dma_data);
1596                         dai->playback_dma_data = NULL;
1597                 } else {
1598                         kfree(dai->capture_dma_data);
1599                         dai->capture_dma_data = NULL;
1600                 }
1601         }
1602         return 0;
1603 }
1604 EXPORT_SYMBOL(cdns_set_sdw_stream);
1605
1606 /**
1607  * cdns_find_pdi() - Find a free PDI
1608  *
1609  * @cdns: Cadence instance
1610  * @offset: Starting offset
1611  * @num: Number of PDIs
1612  * @pdi: PDI instances
1613  * @dai_id: DAI id
1614  *
1615  * Find a PDI for a given PDI array. The PDI num and dai_id are
1616  * expected to match, return NULL otherwise.
1617  */
1618 static struct sdw_cdns_pdi *cdns_find_pdi(struct sdw_cdns *cdns,
1619                                           unsigned int offset,
1620                                           unsigned int num,
1621                                           struct sdw_cdns_pdi *pdi,
1622                                           int dai_id)
1623 {
1624         int i;
1625
1626         for (i = offset; i < offset + num; i++)
1627                 if (pdi[i].num == dai_id)
1628                         return &pdi[i];
1629
1630         return NULL;
1631 }
1632
1633 /**
1634  * sdw_cdns_config_stream: Configure a stream
1635  *
1636  * @cdns: Cadence instance
1637  * @ch: Channel count
1638  * @dir: Data direction
1639  * @pdi: PDI to be used
1640  */
1641 void sdw_cdns_config_stream(struct sdw_cdns *cdns,
1642                             u32 ch, u32 dir, struct sdw_cdns_pdi *pdi)
1643 {
1644         u32 offset, val = 0;
1645
1646         if (dir == SDW_DATA_DIR_RX) {
1647                 val = CDNS_PORTCTRL_DIRN;
1648
1649                 if (cdns->bus.params.m_data_mode != SDW_PORT_DATA_MODE_NORMAL)
1650                         val |= CDNS_PORTCTRL_TEST_FAILED;
1651         }
1652         offset = CDNS_PORTCTRL + pdi->num * CDNS_PORT_OFFSET;
1653         cdns_updatel(cdns, offset,
1654                      CDNS_PORTCTRL_DIRN | CDNS_PORTCTRL_TEST_FAILED,
1655                      val);
1656
1657         val = pdi->num;
1658         val |= CDNS_PDI_CONFIG_SOFT_RESET;
1659         val |= FIELD_PREP(CDNS_PDI_CONFIG_CHANNEL, (1 << ch) - 1);
1660         cdns_writel(cdns, CDNS_PDI_CONFIG(pdi->num), val);
1661 }
1662 EXPORT_SYMBOL(sdw_cdns_config_stream);
1663
1664 /**
1665  * sdw_cdns_alloc_pdi() - Allocate a PDI
1666  *
1667  * @cdns: Cadence instance
1668  * @stream: Stream to be allocated
1669  * @ch: Channel count
1670  * @dir: Data direction
1671  * @dai_id: DAI id
1672  */
1673 struct sdw_cdns_pdi *sdw_cdns_alloc_pdi(struct sdw_cdns *cdns,
1674                                         struct sdw_cdns_streams *stream,
1675                                         u32 ch, u32 dir, int dai_id)
1676 {
1677         struct sdw_cdns_pdi *pdi = NULL;
1678
1679         if (dir == SDW_DATA_DIR_RX)
1680                 pdi = cdns_find_pdi(cdns, 0, stream->num_in, stream->in,
1681                                     dai_id);
1682         else
1683                 pdi = cdns_find_pdi(cdns, 0, stream->num_out, stream->out,
1684                                     dai_id);
1685
1686         /* check if we found a PDI, else find in bi-directional */
1687         if (!pdi)
1688                 pdi = cdns_find_pdi(cdns, 2, stream->num_bd, stream->bd,
1689                                     dai_id);
1690
1691         if (pdi) {
1692                 pdi->l_ch_num = 0;
1693                 pdi->h_ch_num = ch - 1;
1694                 pdi->dir = dir;
1695                 pdi->ch_count = ch;
1696         }
1697
1698         return pdi;
1699 }
1700 EXPORT_SYMBOL(sdw_cdns_alloc_pdi);
1701
1702 MODULE_LICENSE("Dual BSD/GPL");
1703 MODULE_DESCRIPTION("Cadence Soundwire Library");