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
 826         /* Check if the link is up */
 827         if (!cdns->link_up)
 828                 return IRQ_NONE;
 829
 830         int_status = cdns_readl(cdns, CDNS_MCP_INTSTAT);
 831
 832         /* check for reserved values read as zero */
 833         if (int_status & CDNS_MCP_INT_RESERVED)
 834                 return IRQ_NONE;
 835
 836         if (!(int_status & CDNS_MCP_INT_IRQ))
 837                 return IRQ_NONE;
 838
 839         if (int_status & CDNS_MCP_INT_RX_WL) {
 840                 cdns_read_response(cdns);
 841
 842                 if (cdns->defer) {
 843                         cdns_fill_msg_resp(cdns, cdns->defer->msg,
 844                                            cdns->defer->length, 0);
 845                         complete(&cdns->defer->complete);
 846                         cdns->defer = NULL;
 847                 } else {
 848                         complete(&cdns->tx_complete);
 849                 }
 850         }
 851
 852         if (int_status & CDNS_MCP_INT_PARITY) {
 853                 /* Parity error detected by Master */
 854                 dev_err_ratelimited(cdns->dev, "Parity error\n");
 855         }
 856
 857         if (int_status & CDNS_MCP_INT_CTRL_CLASH) {
 858                 /* Slave is driving bit slot during control word */
 859                 dev_err_ratelimited(cdns->dev, "Bus clash for control word\n");
 860         }
 861
 862         if (int_status & CDNS_MCP_INT_DATA_CLASH) {
 863                 /*
 864                  * Multiple slaves trying to drive bit slot, or issue with
 865                  * ownership of data bits or Slave gone bonkers
 866                  */
 867                 dev_err_ratelimited(cdns->dev, "Bus clash for data word\n");
 868         }
 869
 870         if (cdns->bus.params.m_data_mode != SDW_PORT_DATA_MODE_NORMAL &&
 871             int_status & CDNS_MCP_INT_DPINT) {
 872                 u32 port_intstat;
 873
 874                 /* just log which ports report an error */
 875                 port_intstat = cdns_readl(cdns, CDNS_MCP_PORT_INTSTAT);
 876                 dev_err_ratelimited(cdns->dev, "DP interrupt: PortIntStat %8x\n",
 877                                     port_intstat);
 878
 879                 /* clear status w/ write1 */
 880                 cdns_writel(cdns, CDNS_MCP_PORT_INTSTAT, port_intstat);
 881         }
 882
 883         if (int_status & CDNS_MCP_INT_SLAVE_MASK) {
 884                 /* Mask the Slave interrupt and wake thread */
 885                 cdns_updatel(cdns, CDNS_MCP_INTMASK,
 886                              CDNS_MCP_INT_SLAVE_MASK, 0);
 887
 888                 int_status &= ~CDNS_MCP_INT_SLAVE_MASK;
 889
 890                 /*
 891                  * Deal with possible race condition between interrupt
 892                  * handling and disabling interrupts on suspend.
 893                  *
 894                  * If the master is in the process of disabling
 895                  * interrupts, don't schedule a workqueue
 896                  */
 897                 if (cdns->interrupt_enabled)
 898                         schedule_work(&cdns->work);
 899         }
 900
 901         cdns_writel(cdns, CDNS_MCP_INTSTAT, int_status);
 902         return IRQ_HANDLED;
 903 }
 904 EXPORT_SYMBOL(sdw_cdns_irq);
 905
 906 /**
 907  * cdns_update_slave_status_work - update slave status in a work since we will need to handle
 908  * other interrupts eg. CDNS_MCP_INT_RX_WL during the update slave
 909  * process.
 910  * @work: cdns worker thread
 911  */
 912 static void cdns_update_slave_status_work(struct work_struct *work)
 913 {
 914         struct sdw_cdns *cdns =
 915                 container_of(work, struct sdw_cdns, work);
 916         u32 slave0, slave1;
 917         u64 slave_intstat;
 918
 919         slave0 = cdns_readl(cdns, CDNS_MCP_SLAVE_INTSTAT0);
 920         slave1 = cdns_readl(cdns, CDNS_MCP_SLAVE_INTSTAT1);
 921
 922         /* combine the two status */
 923         slave_intstat = ((u64)slave1 << 32) | slave0;
 924
 925         dev_dbg_ratelimited(cdns->dev, "Slave status change: 0x%llx\n", slave_intstat);
 926
 927         cdns_update_slave_status(cdns, slave_intstat);
 928         cdns_writel(cdns, CDNS_MCP_SLAVE_INTSTAT0, slave0);
 929         cdns_writel(cdns, CDNS_MCP_SLAVE_INTSTAT1, slave1);
 930
 931         /* clear and unmask Slave interrupt now */
 932         cdns_writel(cdns, CDNS_MCP_INTSTAT, CDNS_MCP_INT_SLAVE_MASK);
 933         cdns_updatel(cdns, CDNS_MCP_INTMASK,
 934                      CDNS_MCP_INT_SLAVE_MASK, CDNS_MCP_INT_SLAVE_MASK);
 935
 936 }
 937
 938 /* paranoia check to make sure self-cleared bits are indeed cleared */
 939 void sdw_cdns_check_self_clearing_bits(struct sdw_cdns *cdns, const char *string,
 940                                        bool initial_delay, int reset_iterations)
 941 {
 942         u32 mcp_control;
 943         u32 mcp_config_update;
 944         int i;
 945
 946         if (initial_delay)
 947                 usleep_range(1000, 1500);
 948
 949         mcp_control = cdns_readl(cdns, CDNS_MCP_CONTROL);
 950
 951         /* the following bits should be cleared immediately */
 952         if (mcp_control & CDNS_MCP_CONTROL_CMD_RST)
 953                 dev_err(cdns->dev, "%s failed: MCP_CONTROL_CMD_RST is not cleared\n", string);
 954         if (mcp_control & CDNS_MCP_CONTROL_SOFT_RST)
 955                 dev_err(cdns->dev, "%s failed: MCP_CONTROL_SOFT_RST is not cleared\n", string);
 956         if (mcp_control & CDNS_MCP_CONTROL_SW_RST)
 957                 dev_err(cdns->dev, "%s failed: MCP_CONTROL_SW_RST is not cleared\n", string);
 958         if (mcp_control & CDNS_MCP_CONTROL_CLK_STOP_CLR)
 959                 dev_err(cdns->dev, "%s failed: MCP_CONTROL_CLK_STOP_CLR is not cleared\n", string);
 960         mcp_config_update = cdns_readl(cdns, CDNS_MCP_CONFIG_UPDATE);
 961         if (mcp_config_update & CDNS_MCP_CONFIG_UPDATE_BIT)
 962                 dev_err(cdns->dev, "%s failed: MCP_CONFIG_UPDATE_BIT is not cleared\n", string);
 963
 964         i = 0;
 965         while (mcp_control & CDNS_MCP_CONTROL_HW_RST) {
 966                 if (i == reset_iterations) {
 967                         dev_err(cdns->dev, "%s failed: MCP_CONTROL_HW_RST is not cleared\n", string);
 968                         break;
 969                 }
 970
 971                 dev_dbg(cdns->dev, "%s: MCP_CONTROL_HW_RST is not cleared at iteration %d\n", string, i);
 972                 i++;
 973
 974                 usleep_range(1000, 1500);
 975                 mcp_control = cdns_readl(cdns, CDNS_MCP_CONTROL);
 976         }
 977
 978 }
 979 EXPORT_SYMBOL(sdw_cdns_check_self_clearing_bits);
 980
 981 /*
 982  * init routines
 983  */
 984
 985 /**
 986  * sdw_cdns_exit_reset() - Program reset parameters and start bus operations
 987  * @cdns: Cadence instance
 988  */
 989 int sdw_cdns_exit_reset(struct sdw_cdns *cdns)
 990 {
 991         /* program maximum length reset to be safe */
 992         cdns_updatel(cdns, CDNS_MCP_CONTROL,
 993                      CDNS_MCP_CONTROL_RST_DELAY,
 994                      CDNS_MCP_CONTROL_RST_DELAY);
 995
 996         /* use hardware generated reset */
 997         cdns_updatel(cdns, CDNS_MCP_CONTROL,
 998                      CDNS_MCP_CONTROL_HW_RST,
 999                      CDNS_MCP_CONTROL_HW_RST);
1000
1001         /* commit changes */
1002         cdns_updatel(cdns, CDNS_MCP_CONFIG_UPDATE,
1003                      CDNS_MCP_CONFIG_UPDATE_BIT,
1004                      CDNS_MCP_CONFIG_UPDATE_BIT);
1005
1006         /* don't wait here */
1007         return 0;
1008
1009 }
1010 EXPORT_SYMBOL(sdw_cdns_exit_reset);
1011
1012 /**
1013  * cdns_enable_slave_interrupts() - Enable SDW slave interrupts
1014  * @cdns: Cadence instance
1015  * @state: boolean for true/false
1016  */
1017 static void cdns_enable_slave_interrupts(struct sdw_cdns *cdns, bool state)
1018 {
1019         u32 mask;
1020
1021         mask = cdns_readl(cdns, CDNS_MCP_INTMASK);
1022         if (state)
1023                 mask |= CDNS_MCP_INT_SLAVE_MASK;
1024         else
1025                 mask &= ~CDNS_MCP_INT_SLAVE_MASK;
1026
1027         cdns_writel(cdns, CDNS_MCP_INTMASK, mask);
1028 }
1029
1030 /**
1031  * sdw_cdns_enable_interrupt() - Enable SDW interrupts
1032  * @cdns: Cadence instance
1033  * @state: True if we are trying to enable interrupt.
1034  */
1035 int sdw_cdns_enable_interrupt(struct sdw_cdns *cdns, bool state)
1036 {
1037         u32 slave_intmask0 = 0;
1038         u32 slave_intmask1 = 0;
1039         u32 mask = 0;
1040
1041         if (!state)
1042                 goto update_masks;
1043
1044         slave_intmask0 = CDNS_MCP_SLAVE_INTMASK0_MASK;
1045         slave_intmask1 = CDNS_MCP_SLAVE_INTMASK1_MASK;
1046
1047         /* enable detection of all slave state changes */
1048         mask = CDNS_MCP_INT_SLAVE_MASK;
1049
1050         /* enable detection of bus issues */
1051         mask |= CDNS_MCP_INT_CTRL_CLASH | CDNS_MCP_INT_DATA_CLASH |
1052                 CDNS_MCP_INT_PARITY;
1053
1054         /* port interrupt limited to test modes for now */
1055         if (cdns->bus.params.m_data_mode != SDW_PORT_DATA_MODE_NORMAL)
1056                 mask |= CDNS_MCP_INT_DPINT;
1057
1058         /* enable detection of RX fifo level */
1059         mask |= CDNS_MCP_INT_RX_WL;
1060
1061         /*
1062          * CDNS_MCP_INT_IRQ needs to be set otherwise all previous
1063          * settings are irrelevant
1064          */
1065         mask |= CDNS_MCP_INT_IRQ;
1066
1067         if (interrupt_mask) /* parameter override */
1068                 mask = interrupt_mask;
1069
1070 update_masks:
1071         /* clear slave interrupt status before enabling interrupt */
1072         if (state) {
1073                 u32 slave_state;
1074
1075                 slave_state = cdns_readl(cdns, CDNS_MCP_SLAVE_INTSTAT0);
1076                 cdns_writel(cdns, CDNS_MCP_SLAVE_INTSTAT0, slave_state);
1077                 slave_state = cdns_readl(cdns, CDNS_MCP_SLAVE_INTSTAT1);
1078                 cdns_writel(cdns, CDNS_MCP_SLAVE_INTSTAT1, slave_state);
1079         }
1080         cdns->interrupt_enabled = state;
1081
1082         /*
1083          * Complete any on-going status updates before updating masks,
1084          * and cancel queued status updates.
1085          *
1086          * There could be a race with a new interrupt thrown before
1087          * the 3 mask updates below are complete, so in the interrupt
1088          * we use the 'interrupt_enabled' status to prevent new work
1089          * from being queued.
1090          */
1091         if (!state)
1092                 cancel_work_sync(&cdns->work);
1093
1094         cdns_writel(cdns, CDNS_MCP_SLAVE_INTMASK0, slave_intmask0);
1095         cdns_writel(cdns, CDNS_MCP_SLAVE_INTMASK1, slave_intmask1);
1096         cdns_writel(cdns, CDNS_MCP_INTMASK, mask);
1097
1098         return 0;
1099 }
1100 EXPORT_SYMBOL(sdw_cdns_enable_interrupt);
1101
1102 static int cdns_allocate_pdi(struct sdw_cdns *cdns,
1103                              struct sdw_cdns_pdi **stream,
1104                              u32 num, u32 pdi_offset)
1105 {
1106         struct sdw_cdns_pdi *pdi;
1107         int i;
1108
1109         if (!num)
1110                 return 0;
1111
1112         pdi = devm_kcalloc(cdns->dev, num, sizeof(*pdi), GFP_KERNEL);
1113         if (!pdi)
1114                 return -ENOMEM;
1115
1116         for (i = 0; i < num; i++) {
1117                 pdi[i].num = i + pdi_offset;
1118         }
1119
1120         *stream = pdi;
1121         return 0;
1122 }
1123
1124 /**
1125  * sdw_cdns_pdi_init() - PDI initialization routine
1126  *
1127  * @cdns: Cadence instance
1128  * @config: Stream configurations
1129  */
1130 int sdw_cdns_pdi_init(struct sdw_cdns *cdns,
1131                       struct sdw_cdns_stream_config config)
1132 {
1133         struct sdw_cdns_streams *stream;
1134         int offset;
1135         int ret;
1136
1137         cdns->pcm.num_bd = config.pcm_bd;
1138         cdns->pcm.num_in = config.pcm_in;
1139         cdns->pcm.num_out = config.pcm_out;
1140         cdns->pdm.num_bd = config.pdm_bd;
1141         cdns->pdm.num_in = config.pdm_in;
1142         cdns->pdm.num_out = config.pdm_out;
1143
1144         /* Allocate PDIs for PCMs */
1145         stream = &cdns->pcm;
1146
1147         /* we allocate PDI0 and PDI1 which are used for Bulk */
1148         offset = 0;
1149
1150         ret = cdns_allocate_pdi(cdns, &stream->bd,
1151                                 stream->num_bd, offset);
1152         if (ret)
1153                 return ret;
1154
1155         offset += stream->num_bd;
1156
1157         ret = cdns_allocate_pdi(cdns, &stream->in,
1158                                 stream->num_in, offset);
1159         if (ret)
1160                 return ret;
1161
1162         offset += stream->num_in;
1163
1164         ret = cdns_allocate_pdi(cdns, &stream->out,
1165                                 stream->num_out, offset);
1166         if (ret)
1167                 return ret;
1168
1169         /* Update total number of PCM PDIs */
1170         stream->num_pdi = stream->num_bd + stream->num_in + stream->num_out;
1171         cdns->num_ports = stream->num_pdi;
1172
1173         /* Allocate PDIs for PDMs */
1174         stream = &cdns->pdm;
1175         ret = cdns_allocate_pdi(cdns, &stream->bd,
1176                                 stream->num_bd, offset);
1177         if (ret)
1178                 return ret;
1179
1180         offset += stream->num_bd;
1181
1182         ret = cdns_allocate_pdi(cdns, &stream->in,
1183                                 stream->num_in, offset);
1184         if (ret)
1185                 return ret;
1186
1187         offset += stream->num_in;
1188
1189         ret = cdns_allocate_pdi(cdns, &stream->out,
1190                                 stream->num_out, offset);
1191
1192         if (ret)
1193                 return ret;
1194
1195         /* Update total number of PDM PDIs */
1196         stream->num_pdi = stream->num_bd + stream->num_in + stream->num_out;
1197         cdns->num_ports += stream->num_pdi;
1198
1199         return 0;
1200 }
1201 EXPORT_SYMBOL(sdw_cdns_pdi_init);
1202
1203 static u32 cdns_set_initial_frame_shape(int n_rows, int n_cols)
1204 {
1205         u32 val;
1206         int c;
1207         int r;
1208
1209         r = sdw_find_row_index(n_rows);
1210         c = sdw_find_col_index(n_cols);
1211
1212         val = FIELD_PREP(CDNS_MCP_FRAME_SHAPE_ROW_MASK, r);
1213         val |= FIELD_PREP(CDNS_MCP_FRAME_SHAPE_COL_MASK, c);
1214
1215         return val;
1216 }
1217
1218 static void cdns_init_clock_ctrl(struct sdw_cdns *cdns)
1219 {
1220         struct sdw_bus *bus = &cdns->bus;
1221         struct sdw_master_prop *prop = &bus->prop;
1222         u32 val;
1223         u32 ssp_interval;
1224         int divider;
1225
1226         /* Set clock divider */
1227         divider = (prop->mclk_freq / prop->max_clk_freq) - 1;
1228
1229         cdns_updatel(cdns, CDNS_MCP_CLK_CTRL0,
1230                      CDNS_MCP_CLK_MCLKD_MASK, divider);
1231         cdns_updatel(cdns, CDNS_MCP_CLK_CTRL1,
1232                      CDNS_MCP_CLK_MCLKD_MASK, divider);
1233
1234         /*
1235          * Frame shape changes after initialization have to be done
1236          * with the bank switch mechanism
1237          */
1238         val = cdns_set_initial_frame_shape(prop->default_row,
1239                                            prop->default_col);
1240         cdns_writel(cdns, CDNS_MCP_FRAME_SHAPE_INIT, val);
1241
1242         /* Set SSP interval to default value */
1243         ssp_interval = prop->default_frame_rate / SDW_CADENCE_GSYNC_HZ;
1244         cdns_writel(cdns, CDNS_MCP_SSP_CTRL0, ssp_interval);
1245         cdns_writel(cdns, CDNS_MCP_SSP_CTRL1, ssp_interval);
1246 }
1247
1248 /**
1249  * sdw_cdns_init() - Cadence initialization
1250  * @cdns: Cadence instance
1251  */
1252 int sdw_cdns_init(struct sdw_cdns *cdns)
1253 {
1254         u32 val;
1255
1256         cdns_init_clock_ctrl(cdns);
1257
1258         sdw_cdns_check_self_clearing_bits(cdns, __func__, false, 0);
1259
1260         /* reset msg_count to default value of FIFOLEVEL */
1261         cdns->msg_count = cdns_readl(cdns, CDNS_MCP_FIFOLEVEL);
1262
1263         /* flush command FIFOs */
1264         cdns_updatel(cdns, CDNS_MCP_CONTROL, CDNS_MCP_CONTROL_CMD_RST,
1265                      CDNS_MCP_CONTROL_CMD_RST);
1266
1267         /* Set cmd accept mode */
1268         cdns_updatel(cdns, CDNS_MCP_CONTROL, CDNS_MCP_CONTROL_CMD_ACCEPT,
1269                      CDNS_MCP_CONTROL_CMD_ACCEPT);
1270
1271         /* Configure mcp config */
1272         val = cdns_readl(cdns, CDNS_MCP_CONFIG);
1273
1274         /* enable bus operations with clock and data */
1275         val &= ~CDNS_MCP_CONFIG_OP;
1276         val |= CDNS_MCP_CONFIG_OP_NORMAL;
1277
1278         /* Set cmd mode for Tx and Rx cmds */
1279         val &= ~CDNS_MCP_CONFIG_CMD;
1280
1281         /* Disable sniffer mode */
1282         val &= ~CDNS_MCP_CONFIG_SNIFFER;
1283
1284         /* Disable auto bus release */
1285         val &= ~CDNS_MCP_CONFIG_BUS_REL;
1286
1287         if (cdns->bus.multi_link)
1288                 /* Set Multi-master mode to take gsync into account */
1289                 val |= CDNS_MCP_CONFIG_MMASTER;
1290
1291         /* leave frame delay to hardware default of 0x1F */
1292
1293         /* leave command retry to hardware default of 0 */
1294
1295         cdns_writel(cdns, CDNS_MCP_CONFIG, val);
1296
1297         /* changes will be committed later */
1298         return 0;
1299 }
1300 EXPORT_SYMBOL(sdw_cdns_init);
1301
1302 int cdns_bus_conf(struct sdw_bus *bus, struct sdw_bus_params *params)
1303 {
1304         struct sdw_master_prop *prop = &bus->prop;
1305         struct sdw_cdns *cdns = bus_to_cdns(bus);
1306         int mcp_clkctrl_off;
1307         int divider;
1308
1309         if (!params->curr_dr_freq) {
1310                 dev_err(cdns->dev, "NULL curr_dr_freq\n");
1311                 return -EINVAL;
1312         }
1313
1314         divider = prop->mclk_freq * SDW_DOUBLE_RATE_FACTOR /
1315                 params->curr_dr_freq;
1316         divider--; /* divider is 1/(N+1) */
1317
1318         if (params->next_bank)
1319                 mcp_clkctrl_off = CDNS_MCP_CLK_CTRL1;
1320         else
1321                 mcp_clkctrl_off = CDNS_MCP_CLK_CTRL0;
1322
1323         cdns_updatel(cdns, mcp_clkctrl_off, CDNS_MCP_CLK_MCLKD_MASK, divider);
1324
1325         return 0;
1326 }
1327 EXPORT_SYMBOL(cdns_bus_conf);
1328
1329 static int cdns_port_params(struct sdw_bus *bus,
1330                             struct sdw_port_params *p_params, unsigned int bank)
1331 {
1332         struct sdw_cdns *cdns = bus_to_cdns(bus);
1333         int dpn_config = 0, dpn_config_off;
1334
1335         if (bank)
1336                 dpn_config_off = CDNS_DPN_B1_CONFIG(p_params->num);
1337         else
1338                 dpn_config_off = CDNS_DPN_B0_CONFIG(p_params->num);
1339
1340         dpn_config = cdns_readl(cdns, dpn_config_off);
1341
1342         u32p_replace_bits(&dpn_config, (p_params->bps - 1), CDNS_DPN_CONFIG_WL);
1343         u32p_replace_bits(&dpn_config, p_params->flow_mode, CDNS_DPN_CONFIG_PORT_FLOW);
1344         u32p_replace_bits(&dpn_config, p_params->data_mode, CDNS_DPN_CONFIG_PORT_DAT);
1345
1346         cdns_writel(cdns, dpn_config_off, dpn_config);
1347
1348         return 0;
1349 }
1350
1351 static int cdns_transport_params(struct sdw_bus *bus,
1352                                  struct sdw_transport_params *t_params,
1353                                  enum sdw_reg_bank bank)
1354 {
1355         struct sdw_cdns *cdns = bus_to_cdns(bus);
1356         int dpn_offsetctrl = 0, dpn_offsetctrl_off;
1357         int dpn_config = 0, dpn_config_off;
1358         int dpn_hctrl = 0, dpn_hctrl_off;
1359         int num = t_params->port_num;
1360         int dpn_samplectrl_off;
1361
1362         /*
1363          * Note: Only full data port is supported on the Master side for
1364          * both PCM and PDM ports.
1365          */
1366
1367         if (bank) {
1368                 dpn_config_off = CDNS_DPN_B1_CONFIG(num);
1369                 dpn_samplectrl_off = CDNS_DPN_B1_SAMPLE_CTRL(num);
1370                 dpn_hctrl_off = CDNS_DPN_B1_HCTRL(num);
1371                 dpn_offsetctrl_off = CDNS_DPN_B1_OFFSET_CTRL(num);
1372         } else {
1373                 dpn_config_off = CDNS_DPN_B0_CONFIG(num);
1374                 dpn_samplectrl_off = CDNS_DPN_B0_SAMPLE_CTRL(num);
1375                 dpn_hctrl_off = CDNS_DPN_B0_HCTRL(num);
1376                 dpn_offsetctrl_off = CDNS_DPN_B0_OFFSET_CTRL(num);
1377         }
1378
1379         dpn_config = cdns_readl(cdns, dpn_config_off);
1380         u32p_replace_bits(&dpn_config, t_params->blk_grp_ctrl, CDNS_DPN_CONFIG_BGC);
1381         u32p_replace_bits(&dpn_config, t_params->blk_pkg_mode, CDNS_DPN_CONFIG_BPM);
1382         cdns_writel(cdns, dpn_config_off, dpn_config);
1383
1384         u32p_replace_bits(&dpn_offsetctrl, t_params->offset1, CDNS_DPN_OFFSET_CTRL_1);
1385         u32p_replace_bits(&dpn_offsetctrl, t_params->offset2, CDNS_DPN_OFFSET_CTRL_2);
1386         cdns_writel(cdns, dpn_offsetctrl_off,  dpn_offsetctrl);
1387
1388         u32p_replace_bits(&dpn_hctrl, t_params->hstart, CDNS_DPN_HCTRL_HSTART);
1389         u32p_replace_bits(&dpn_hctrl, t_params->hstop, CDNS_DPN_HCTRL_HSTOP);
1390         u32p_replace_bits(&dpn_hctrl, t_params->lane_ctrl, CDNS_DPN_HCTRL_LCTRL);
1391
1392         cdns_writel(cdns, dpn_hctrl_off, dpn_hctrl);
1393         cdns_writel(cdns, dpn_samplectrl_off, (t_params->sample_interval - 1));
1394
1395         return 0;
1396 }
1397
1398 static int cdns_port_enable(struct sdw_bus *bus,
1399                             struct sdw_enable_ch *enable_ch, unsigned int bank)
1400 {
1401         struct sdw_cdns *cdns = bus_to_cdns(bus);
1402         int dpn_chnen_off, ch_mask;
1403
1404         if (bank)
1405                 dpn_chnen_off = CDNS_DPN_B1_CH_EN(enable_ch->port_num);
1406         else
1407                 dpn_chnen_off = CDNS_DPN_B0_CH_EN(enable_ch->port_num);
1408
1409         ch_mask = enable_ch->ch_mask * enable_ch->enable;
1410         cdns_writel(cdns, dpn_chnen_off, ch_mask);
1411
1412         return 0;
1413 }
1414
1415 static const struct sdw_master_port_ops cdns_port_ops = {
1416         .dpn_set_port_params = cdns_port_params,
1417         .dpn_set_port_transport_params = cdns_transport_params,
1418         .dpn_port_enable_ch = cdns_port_enable,
1419 };
1420
1421 /**
1422  * sdw_cdns_is_clock_stop: Check clock status
1423  *
1424  * @cdns: Cadence instance
1425  */
1426 bool sdw_cdns_is_clock_stop(struct sdw_cdns *cdns)
1427 {
1428         return !!(cdns_readl(cdns, CDNS_MCP_STAT) & CDNS_MCP_STAT_CLK_STOP);
1429 }
1430 EXPORT_SYMBOL(sdw_cdns_is_clock_stop);
1431
1432 /**
1433  * sdw_cdns_clock_stop: Cadence clock stop configuration routine
1434  *
1435  * @cdns: Cadence instance
1436  * @block_wake: prevent wakes if required by the platform
1437  */
1438 int sdw_cdns_clock_stop(struct sdw_cdns *cdns, bool block_wake)
1439 {
1440         bool slave_present = false;
1441         struct sdw_slave *slave;
1442         int ret;
1443
1444         sdw_cdns_check_self_clearing_bits(cdns, __func__, false, 0);
1445
1446         /* Check suspend status */
1447         if (sdw_cdns_is_clock_stop(cdns)) {
1448                 dev_dbg(cdns->dev, "Clock is already stopped\n");
1449                 return 0;
1450         }
1451
1452         /*
1453          * Before entering clock stop we mask the Slave
1454          * interrupts. This helps avoid having to deal with e.g. a
1455          * Slave becoming UNATTACHED while the clock is being stopped
1456          */
1457         cdns_enable_slave_interrupts(cdns, false);
1458
1459         /*
1460          * For specific platforms, it is required to be able to put
1461          * master into a state in which it ignores wake-up trials
1462          * in clock stop state
1463          */
1464         if (block_wake)
1465                 cdns_updatel(cdns, CDNS_MCP_CONTROL,
1466                              CDNS_MCP_CONTROL_BLOCK_WAKEUP,
1467                              CDNS_MCP_CONTROL_BLOCK_WAKEUP);
1468
1469         list_for_each_entry(slave, &cdns->bus.slaves, node) {
1470                 if (slave->status == SDW_SLAVE_ATTACHED ||
1471                     slave->status == SDW_SLAVE_ALERT) {
1472                         slave_present = true;
1473                         break;
1474                 }
1475         }
1476
1477         /* commit changes */
1478         ret = cdns_config_update(cdns);
1479         if (ret < 0) {
1480                 dev_err(cdns->dev, "%s: config_update failed\n", __func__);
1481                 return ret;
1482         }
1483
1484         /* Prepare slaves for clock stop */
1485         if (slave_present) {
1486                 ret = sdw_bus_prep_clk_stop(&cdns->bus);
1487                 if (ret < 0 && ret != -ENODATA) {
1488                         dev_err(cdns->dev, "prepare clock stop failed %d\n", ret);
1489                         return ret;
1490                 }
1491         }
1492
1493         /*
1494          * Enter clock stop mode and only report errors if there are
1495          * Slave devices present (ALERT or ATTACHED)
1496          */
1497         ret = sdw_bus_clk_stop(&cdns->bus);
1498         if (ret < 0 && slave_present && ret != -ENODATA) {
1499                 dev_err(cdns->dev, "bus clock stop failed %d\n", ret);
1500                 return ret;
1501         }
1502
1503         ret = cdns_set_wait(cdns, CDNS_MCP_STAT,
1504                             CDNS_MCP_STAT_CLK_STOP,
1505                             CDNS_MCP_STAT_CLK_STOP);
1506         if (ret < 0)
1507                 dev_err(cdns->dev, "Clock stop failed %d\n", ret);
1508
1509         return ret;
1510 }
1511 EXPORT_SYMBOL(sdw_cdns_clock_stop);
1512
1513 /**
1514  * sdw_cdns_clock_restart: Cadence PM clock restart configuration routine
1515  *
1516  * @cdns: Cadence instance
1517  * @bus_reset: context may be lost while in low power modes and the bus
1518  * may require a Severe Reset and re-enumeration after a wake.
1519  */
1520 int sdw_cdns_clock_restart(struct sdw_cdns *cdns, bool bus_reset)
1521 {
1522         int ret;
1523
1524         /* unmask Slave interrupts that were masked when stopping the clock */
1525         cdns_enable_slave_interrupts(cdns, true);
1526
1527         ret = cdns_clear_bit(cdns, CDNS_MCP_CONTROL,
1528                              CDNS_MCP_CONTROL_CLK_STOP_CLR);
1529         if (ret < 0) {
1530                 dev_err(cdns->dev, "Couldn't exit from clock stop\n");
1531                 return ret;
1532         }
1533
1534         ret = cdns_set_wait(cdns, CDNS_MCP_STAT, CDNS_MCP_STAT_CLK_STOP, 0);
1535         if (ret < 0) {
1536                 dev_err(cdns->dev, "clock stop exit failed %d\n", ret);
1537                 return ret;
1538         }
1539
1540         cdns_updatel(cdns, CDNS_MCP_CONTROL,
1541                      CDNS_MCP_CONTROL_BLOCK_WAKEUP, 0);
1542
1543         cdns_updatel(cdns, CDNS_MCP_CONTROL, CDNS_MCP_CONTROL_CMD_ACCEPT,
1544                      CDNS_MCP_CONTROL_CMD_ACCEPT);
1545
1546         if (!bus_reset) {
1547
1548                 /* enable bus operations with clock and data */
1549                 cdns_updatel(cdns, CDNS_MCP_CONFIG,
1550                              CDNS_MCP_CONFIG_OP,
1551                              CDNS_MCP_CONFIG_OP_NORMAL);
1552
1553                 ret = cdns_config_update(cdns);
1554                 if (ret < 0) {
1555                         dev_err(cdns->dev, "%s: config_update failed\n", __func__);
1556                         return ret;
1557                 }
1558
1559                 ret = sdw_bus_exit_clk_stop(&cdns->bus);
1560                 if (ret < 0)
1561                         dev_err(cdns->dev, "bus failed to exit clock stop %d\n", ret);
1562         }
1563
1564         return ret;
1565 }
1566 EXPORT_SYMBOL(sdw_cdns_clock_restart);
1567
1568 /**
1569  * sdw_cdns_probe() - Cadence probe routine
1570  * @cdns: Cadence instance
1571  */
1572 int sdw_cdns_probe(struct sdw_cdns *cdns)
1573 {
1574         init_completion(&cdns->tx_complete);
1575         cdns->bus.port_ops = &cdns_port_ops;
1576
1577         INIT_WORK(&cdns->work, cdns_update_slave_status_work);
1578         return 0;
1579 }
1580 EXPORT_SYMBOL(sdw_cdns_probe);
1581
1582 int cdns_set_sdw_stream(struct snd_soc_dai *dai,
1583                         void *stream, bool pcm, int direction)
1584 {
1585         struct sdw_cdns *cdns = snd_soc_dai_get_drvdata(dai);
1586         struct sdw_cdns_dma_data *dma;
1587
1588         if (stream) {
1589                 /* first paranoia check */
1590                 if (direction == SNDRV_PCM_STREAM_PLAYBACK)
1591                         dma = dai->playback_dma_data;
1592                 else
1593                         dma = dai->capture_dma_data;
1594
1595                 if (dma) {
1596                         dev_err(dai->dev,
1597                                 "dma_data already allocated for dai %s\n",
1598                                 dai->name);
1599                         return -EINVAL;
1600                 }
1601
1602                 /* allocate and set dma info */
1603                 dma = kzalloc(sizeof(*dma), GFP_KERNEL);
1604                 if (!dma)
1605                         return -ENOMEM;
1606
1607                 if (pcm)
1608                         dma->stream_type = SDW_STREAM_PCM;
1609                 else
1610                         dma->stream_type = SDW_STREAM_PDM;
1611
1612                 dma->bus = &cdns->bus;
1613                 dma->link_id = cdns->instance;
1614
1615                 dma->stream = stream;
1616
1617                 if (direction == SNDRV_PCM_STREAM_PLAYBACK)
1618                         dai->playback_dma_data = dma;
1619                 else
1620                         dai->capture_dma_data = dma;
1621         } else {
1622                 /* for NULL stream we release allocated dma_data */
1623                 if (direction == SNDRV_PCM_STREAM_PLAYBACK) {
1624                         kfree(dai->playback_dma_data);
1625                         dai->playback_dma_data = NULL;
1626                 } else {
1627                         kfree(dai->capture_dma_data);
1628                         dai->capture_dma_data = NULL;
1629                 }
1630         }
1631         return 0;
1632 }
1633 EXPORT_SYMBOL(cdns_set_sdw_stream);
1634
1635 /**
1636  * cdns_find_pdi() - Find a free PDI
1637  *
1638  * @cdns: Cadence instance
1639  * @offset: Starting offset
1640  * @num: Number of PDIs
1641  * @pdi: PDI instances
1642  * @dai_id: DAI id
1643  *
1644  * Find a PDI for a given PDI array. The PDI num and dai_id are
1645  * expected to match, return NULL otherwise.
1646  */
1647 static struct sdw_cdns_pdi *cdns_find_pdi(struct sdw_cdns *cdns,
1648                                           unsigned int offset,
1649                                           unsigned int num,
1650                                           struct sdw_cdns_pdi *pdi,
1651                                           int dai_id)
1652 {
1653         int i;
1654
1655         for (i = offset; i < offset + num; i++)
1656                 if (pdi[i].num == dai_id)
1657                         return &pdi[i];
1658
1659         return NULL;
1660 }
1661
1662 /**
1663  * sdw_cdns_config_stream: Configure a stream
1664  *
1665  * @cdns: Cadence instance
1666  * @ch: Channel count
1667  * @dir: Data direction
1668  * @pdi: PDI to be used
1669  */
1670 void sdw_cdns_config_stream(struct sdw_cdns *cdns,
1671                             u32 ch, u32 dir, struct sdw_cdns_pdi *pdi)
1672 {
1673         u32 offset, val = 0;
1674
1675         if (dir == SDW_DATA_DIR_RX) {
1676                 val = CDNS_PORTCTRL_DIRN;
1677
1678                 if (cdns->bus.params.m_data_mode != SDW_PORT_DATA_MODE_NORMAL)
1679                         val |= CDNS_PORTCTRL_TEST_FAILED;
1680         }
1681         offset = CDNS_PORTCTRL + pdi->num * CDNS_PORT_OFFSET;
1682         cdns_updatel(cdns, offset,
1683                      CDNS_PORTCTRL_DIRN | CDNS_PORTCTRL_TEST_FAILED,
1684                      val);
1685
1686         val = pdi->num;
1687         val |= CDNS_PDI_CONFIG_SOFT_RESET;
1688         val |= FIELD_PREP(CDNS_PDI_CONFIG_CHANNEL, (1 << ch) - 1);
1689         cdns_writel(cdns, CDNS_PDI_CONFIG(pdi->num), val);
1690 }
1691 EXPORT_SYMBOL(sdw_cdns_config_stream);
1692
1693 /**
1694  * sdw_cdns_alloc_pdi() - Allocate a PDI
1695  *
1696  * @cdns: Cadence instance
1697  * @stream: Stream to be allocated
1698  * @ch: Channel count
1699  * @dir: Data direction
1700  * @dai_id: DAI id
1701  */
1702 struct sdw_cdns_pdi *sdw_cdns_alloc_pdi(struct sdw_cdns *cdns,
1703                                         struct sdw_cdns_streams *stream,
1704                                         u32 ch, u32 dir, int dai_id)
1705 {
1706         struct sdw_cdns_pdi *pdi = NULL;
1707
1708         if (dir == SDW_DATA_DIR_RX)
1709                 pdi = cdns_find_pdi(cdns, 0, stream->num_in, stream->in,
1710                                     dai_id);
1711         else
1712                 pdi = cdns_find_pdi(cdns, 0, stream->num_out, stream->out,
1713                                     dai_id);
1714
1715         /* check if we found a PDI, else find in bi-directional */
1716         if (!pdi)
1717                 pdi = cdns_find_pdi(cdns, 2, stream->num_bd, stream->bd,
1718                                     dai_id);
1719
1720         if (pdi) {
1721                 pdi->l_ch_num = 0;
1722                 pdi->h_ch_num = ch - 1;
1723                 pdi->dir = dir;
1724                 pdi->ch_count = ch;
1725         }
1726
1727         return pdi;
1728 }
1729 EXPORT_SYMBOL(sdw_cdns_alloc_pdi);
1730
1731 MODULE_LICENSE("Dual BSD/GPL");
1732 MODULE_DESCRIPTION("Cadence Soundwire Library");