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 static int cdns_set_pdi_loopback_source(void *data, u64 value)
 454 {
 455         struct sdw_cdns *cdns = data;
 456         unsigned int pdi_out_num = cdns->pcm.num_bd + cdns->pcm.num_out;
 457
 458         if (value > pdi_out_num)
 459                 return -EINVAL;
 460
 461         /* Userspace changed the hardware state behind the kernel's back */
 462         add_taint(TAINT_USER, LOCKDEP_STILL_OK);
 463
 464         cdns->pdi_loopback_source = value;
 465
 466         return 0;
 467 }
 468 DEFINE_DEBUGFS_ATTRIBUTE(cdns_pdi_loopback_source_fops, NULL, cdns_set_pdi_loopback_source, "%llu\n");
 469
 470 static int cdns_set_pdi_loopback_target(void *data, u64 value)
 471 {
 472         struct sdw_cdns *cdns = data;
 473         unsigned int pdi_in_num = cdns->pcm.num_bd + cdns->pcm.num_in;
 474
 475         if (value > pdi_in_num)
 476                 return -EINVAL;
 477
 478         /* Userspace changed the hardware state behind the kernel's back */
 479         add_taint(TAINT_USER, LOCKDEP_STILL_OK);
 480
 481         cdns->pdi_loopback_target = value;
 482
 483         return 0;
 484 }
 485 DEFINE_DEBUGFS_ATTRIBUTE(cdns_pdi_loopback_target_fops, NULL, cdns_set_pdi_loopback_target, "%llu\n");
 486
 487 /**
 488  * sdw_cdns_debugfs_init() - Cadence debugfs init
 489  * @cdns: Cadence instance
 490  * @root: debugfs root
 491  */
 492 void sdw_cdns_debugfs_init(struct sdw_cdns *cdns, struct dentry *root)
 493 {
 494         debugfs_create_file("cdns-registers", 0400, root, cdns, &cdns_reg_fops);
 495
 496         debugfs_create_file("cdns-hw-reset", 0200, root, cdns,
 497                             &cdns_hw_reset_fops);
 498
 499         debugfs_create_file("cdns-parity-error-injection", 0200, root, cdns,
 500                             &cdns_parity_error_fops);
 501
 502         cdns->pdi_loopback_source = -1;
 503         cdns->pdi_loopback_target = -1;
 504
 505         debugfs_create_file("cdns-pdi-loopback-source", 0200, root, cdns,
 506                             &cdns_pdi_loopback_source_fops);
 507
 508         debugfs_create_file("cdns-pdi-loopback-target", 0200, root, cdns,
 509                             &cdns_pdi_loopback_target_fops);
 510
 511 }
 512 EXPORT_SYMBOL_GPL(sdw_cdns_debugfs_init);
 513
 514 #endif /* CONFIG_DEBUG_FS */
 515
 516 /*
 517  * IO Calls
 518  */
 519 static enum sdw_command_response
 520 cdns_fill_msg_resp(struct sdw_cdns *cdns,
 521                    struct sdw_msg *msg, int count, int offset)
 522 {
 523         int nack = 0, no_ack = 0;
 524         int i;
 525
 526         /* check message response */
 527         for (i = 0; i < count; i++) {
 528                 if (!(cdns->response_buf[i] & CDNS_MCP_RESP_ACK)) {
 529                         no_ack = 1;
 530                         dev_vdbg(cdns->dev, "Msg Ack not received, cmd %d\n", i);
 531                 }
 532                 if (cdns->response_buf[i] & CDNS_MCP_RESP_NACK) {
 533                         nack = 1;
 534                         dev_err_ratelimited(cdns->dev, "Msg NACK received, cmd %d\n", i);
 535                 }
 536         }
 537
 538         if (nack) {
 539                 dev_err_ratelimited(cdns->dev, "Msg NACKed for Slave %d\n", msg->dev_num);
 540                 return SDW_CMD_FAIL;
 541         }
 542
 543         if (no_ack) {
 544                 dev_dbg_ratelimited(cdns->dev, "Msg ignored for Slave %d\n", msg->dev_num);
 545                 return SDW_CMD_IGNORED;
 546         }
 547
 548         /* fill response */
 549         for (i = 0; i < count; i++)
 550                 msg->buf[i + offset] = FIELD_GET(CDNS_MCP_RESP_RDATA, cdns->response_buf[i]);
 551
 552         return SDW_CMD_OK;
 553 }
 554
 555 static enum sdw_command_response
 556 _cdns_xfer_msg(struct sdw_cdns *cdns, struct sdw_msg *msg, int cmd,
 557                int offset, int count, bool defer)
 558 {
 559         unsigned long time;
 560         u32 base, i, data;
 561         u16 addr;
 562
 563         /* Program the watermark level for RX FIFO */
 564         if (cdns->msg_count != count) {
 565                 cdns_writel(cdns, CDNS_MCP_FIFOLEVEL, count);
 566                 cdns->msg_count = count;
 567         }
 568
 569         base = CDNS_MCP_CMD_BASE;
 570         addr = msg->addr;
 571
 572         for (i = 0; i < count; i++) {
 573                 data = FIELD_PREP(CDNS_MCP_CMD_DEV_ADDR, msg->dev_num);
 574                 data |= FIELD_PREP(CDNS_MCP_CMD_COMMAND, cmd);
 575                 data |= FIELD_PREP(CDNS_MCP_CMD_REG_ADDR, addr);
 576                 addr++;
 577
 578                 if (msg->flags == SDW_MSG_FLAG_WRITE)
 579                         data |= msg->buf[i + offset];
 580
 581                 data |= FIELD_PREP(CDNS_MCP_CMD_SSP_TAG, msg->ssp_sync);
 582                 cdns_writel(cdns, base, data);
 583                 base += CDNS_MCP_CMD_WORD_LEN;
 584         }
 585
 586         if (defer)
 587                 return SDW_CMD_OK;
 588
 589         /* wait for timeout or response */
 590         time = wait_for_completion_timeout(&cdns->tx_complete,
 591                                            msecs_to_jiffies(CDNS_TX_TIMEOUT));
 592         if (!time) {
 593                 dev_err(cdns->dev, "IO transfer timed out, cmd %d device %d addr %x len %d\n",
 594                         cmd, msg->dev_num, msg->addr, msg->len);
 595                 msg->len = 0;
 596                 return SDW_CMD_TIMEOUT;
 597         }
 598
 599         return cdns_fill_msg_resp(cdns, msg, count, offset);
 600 }
 601
 602 static enum sdw_command_response
 603 cdns_program_scp_addr(struct sdw_cdns *cdns, struct sdw_msg *msg)
 604 {
 605         int nack = 0, no_ack = 0;
 606         unsigned long time;
 607         u32 data[2], base;
 608         int i;
 609
 610         /* Program the watermark level for RX FIFO */
 611         if (cdns->msg_count != CDNS_SCP_RX_FIFOLEVEL) {
 612                 cdns_writel(cdns, CDNS_MCP_FIFOLEVEL, CDNS_SCP_RX_FIFOLEVEL);
 613                 cdns->msg_count = CDNS_SCP_RX_FIFOLEVEL;
 614         }
 615
 616         data[0] = FIELD_PREP(CDNS_MCP_CMD_DEV_ADDR, msg->dev_num);
 617         data[0] |= FIELD_PREP(CDNS_MCP_CMD_COMMAND, 0x3);
 618         data[1] = data[0];
 619
 620         data[0] |= FIELD_PREP(CDNS_MCP_CMD_REG_ADDR, SDW_SCP_ADDRPAGE1);
 621         data[1] |= FIELD_PREP(CDNS_MCP_CMD_REG_ADDR, SDW_SCP_ADDRPAGE2);
 622
 623         data[0] |= msg->addr_page1;
 624         data[1] |= msg->addr_page2;
 625
 626         base = CDNS_MCP_CMD_BASE;
 627         cdns_writel(cdns, base, data[0]);
 628         base += CDNS_MCP_CMD_WORD_LEN;
 629         cdns_writel(cdns, base, data[1]);
 630
 631         time = wait_for_completion_timeout(&cdns->tx_complete,
 632                                            msecs_to_jiffies(CDNS_TX_TIMEOUT));
 633         if (!time) {
 634                 dev_err(cdns->dev, "SCP Msg trf timed out\n");
 635                 msg->len = 0;
 636                 return SDW_CMD_TIMEOUT;
 637         }
 638
 639         /* check response the writes */
 640         for (i = 0; i < 2; i++) {
 641                 if (!(cdns->response_buf[i] & CDNS_MCP_RESP_ACK)) {
 642                         no_ack = 1;
 643                         dev_err(cdns->dev, "Program SCP Ack not received\n");
 644                         if (cdns->response_buf[i] & CDNS_MCP_RESP_NACK) {
 645                                 nack = 1;
 646                                 dev_err(cdns->dev, "Program SCP NACK received\n");
 647                         }
 648                 }
 649         }
 650
 651         /* For NACK, NO ack, don't return err if we are in Broadcast mode */
 652         if (nack) {
 653                 dev_err_ratelimited(cdns->dev,
 654                                     "SCP_addrpage NACKed for Slave %d\n", msg->dev_num);
 655                 return SDW_CMD_FAIL;
 656         }
 657
 658         if (no_ack) {
 659                 dev_dbg_ratelimited(cdns->dev,
 660                                     "SCP_addrpage ignored for Slave %d\n", msg->dev_num);
 661                 return SDW_CMD_IGNORED;
 662         }
 663
 664         return SDW_CMD_OK;
 665 }
 666
 667 static int cdns_prep_msg(struct sdw_cdns *cdns, struct sdw_msg *msg, int *cmd)
 668 {
 669         int ret;
 670
 671         if (msg->page) {
 672                 ret = cdns_program_scp_addr(cdns, msg);
 673                 if (ret) {
 674                         msg->len = 0;
 675                         return ret;
 676                 }
 677         }
 678
 679         switch (msg->flags) {
 680         case SDW_MSG_FLAG_READ:
 681                 *cmd = CDNS_MCP_CMD_READ;
 682                 break;
 683
 684         case SDW_MSG_FLAG_WRITE:
 685                 *cmd = CDNS_MCP_CMD_WRITE;
 686                 break;
 687
 688         default:
 689                 dev_err(cdns->dev, "Invalid msg cmd: %d\n", msg->flags);
 690                 return -EINVAL;
 691         }
 692
 693         return 0;
 694 }
 695
 696 enum sdw_command_response
 697 cdns_xfer_msg(struct sdw_bus *bus, struct sdw_msg *msg)
 698 {
 699         struct sdw_cdns *cdns = bus_to_cdns(bus);
 700         int cmd = 0, ret, i;
 701
 702         ret = cdns_prep_msg(cdns, msg, &cmd);
 703         if (ret)
 704                 return SDW_CMD_FAIL_OTHER;
 705
 706         for (i = 0; i < msg->len / CDNS_MCP_CMD_LEN; i++) {
 707                 ret = _cdns_xfer_msg(cdns, msg, cmd, i * CDNS_MCP_CMD_LEN,
 708                                      CDNS_MCP_CMD_LEN, false);
 709                 if (ret < 0)
 710                         goto exit;
 711         }
 712
 713         if (!(msg->len % CDNS_MCP_CMD_LEN))
 714                 goto exit;
 715
 716         ret = _cdns_xfer_msg(cdns, msg, cmd, i * CDNS_MCP_CMD_LEN,
 717                              msg->len % CDNS_MCP_CMD_LEN, false);
 718
 719 exit:
 720         return ret;
 721 }
 722 EXPORT_SYMBOL(cdns_xfer_msg);
 723
 724 enum sdw_command_response
 725 cdns_xfer_msg_defer(struct sdw_bus *bus,
 726                     struct sdw_msg *msg, struct sdw_defer *defer)
 727 {
 728         struct sdw_cdns *cdns = bus_to_cdns(bus);
 729         int cmd = 0, ret;
 730
 731         /* for defer only 1 message is supported */
 732         if (msg->len > 1)
 733                 return -ENOTSUPP;
 734
 735         ret = cdns_prep_msg(cdns, msg, &cmd);
 736         if (ret)
 737                 return SDW_CMD_FAIL_OTHER;
 738
 739         cdns->defer = defer;
 740         cdns->defer->length = msg->len;
 741
 742         return _cdns_xfer_msg(cdns, msg, cmd, 0, msg->len, true);
 743 }
 744 EXPORT_SYMBOL(cdns_xfer_msg_defer);
 745
 746 enum sdw_command_response
 747 cdns_reset_page_addr(struct sdw_bus *bus, unsigned int dev_num)
 748 {
 749         struct sdw_cdns *cdns = bus_to_cdns(bus);
 750         struct sdw_msg msg;
 751
 752         /* Create dummy message with valid device number */
 753         memset(&msg, 0, sizeof(msg));
 754         msg.dev_num = dev_num;
 755
 756         return cdns_program_scp_addr(cdns, &msg);
 757 }
 758 EXPORT_SYMBOL(cdns_reset_page_addr);
 759
 760 /*
 761  * IRQ handling
 762  */
 763
 764 static void cdns_read_response(struct sdw_cdns *cdns)
 765 {
 766         u32 num_resp, cmd_base;
 767         int i;
 768
 769         num_resp = cdns_readl(cdns, CDNS_MCP_FIFOSTAT);
 770         num_resp &= CDNS_MCP_RX_FIFO_AVAIL;
 771
 772         cmd_base = CDNS_MCP_CMD_BASE;
 773
 774         for (i = 0; i < num_resp; i++) {
 775                 cdns->response_buf[i] = cdns_readl(cdns, cmd_base);
 776                 cmd_base += CDNS_MCP_CMD_WORD_LEN;
 777         }
 778 }
 779
 780 static int cdns_update_slave_status(struct sdw_cdns *cdns,
 781                                     u64 slave_intstat)
 782 {
 783         enum sdw_slave_status status[SDW_MAX_DEVICES + 1];
 784         bool is_slave = false;
 785         u32 mask;
 786         int i, set_status;
 787
 788         memset(status, 0, sizeof(status));
 789
 790         for (i = 0; i <= SDW_MAX_DEVICES; i++) {
 791                 mask = (slave_intstat >> (i * CDNS_MCP_SLAVE_STATUS_NUM)) &
 792                         CDNS_MCP_SLAVE_STATUS_BITS;
 793                 if (!mask)
 794                         continue;
 795
 796                 is_slave = true;
 797                 set_status = 0;
 798
 799                 if (mask & CDNS_MCP_SLAVE_INTSTAT_RESERVED) {
 800                         status[i] = SDW_SLAVE_RESERVED;
 801                         set_status++;
 802                 }
 803
 804                 if (mask & CDNS_MCP_SLAVE_INTSTAT_ATTACHED) {
 805                         status[i] = SDW_SLAVE_ATTACHED;
 806                         set_status++;
 807                 }
 808
 809                 if (mask & CDNS_MCP_SLAVE_INTSTAT_ALERT) {
 810                         status[i] = SDW_SLAVE_ALERT;
 811                         set_status++;
 812                 }
 813
 814                 if (mask & CDNS_MCP_SLAVE_INTSTAT_NPRESENT) {
 815                         status[i] = SDW_SLAVE_UNATTACHED;
 816                         set_status++;
 817                 }
 818
 819                 /* first check if Slave reported multiple status */
 820                 if (set_status > 1) {
 821                         u32 val;
 822
 823                         dev_warn_ratelimited(cdns->dev,
 824                                              "Slave %d reported multiple Status: %d\n",
 825                                              i, mask);
 826
 827                         /* check latest status extracted from PING commands */
 828                         val = cdns_readl(cdns, CDNS_MCP_SLAVE_STAT);
 829                         val >>= (i * 2);
 830
 831                         switch (val & 0x3) {
 832                         case 0:
 833                                 status[i] = SDW_SLAVE_UNATTACHED;
 834                                 break;
 835                         case 1:
 836                                 status[i] = SDW_SLAVE_ATTACHED;
 837                                 break;
 838                         case 2:
 839                                 status[i] = SDW_SLAVE_ALERT;
 840                                 break;
 841                         case 3:
 842                         default:
 843                                 status[i] = SDW_SLAVE_RESERVED;
 844                                 break;
 845                         }
 846
 847                         dev_warn_ratelimited(cdns->dev,
 848                                              "Slave %d status updated to %d\n",
 849                                              i, status[i]);
 850
 851                 }
 852         }
 853
 854         if (is_slave)
 855                 return sdw_handle_slave_status(&cdns->bus, status);
 856
 857         return 0;
 858 }
 859
 860 /**
 861  * sdw_cdns_irq() - Cadence interrupt handler
 862  * @irq: irq number
 863  * @dev_id: irq context
 864  */
 865 irqreturn_t sdw_cdns_irq(int irq, void *dev_id)
 866 {
 867         struct sdw_cdns *cdns = dev_id;
 868         u32 int_status;
 869
 870         /* Check if the link is up */
 871         if (!cdns->link_up)
 872                 return IRQ_NONE;
 873
 874         int_status = cdns_readl(cdns, CDNS_MCP_INTSTAT);
 875
 876         /* check for reserved values read as zero */
 877         if (int_status & CDNS_MCP_INT_RESERVED)
 878                 return IRQ_NONE;
 879
 880         if (!(int_status & CDNS_MCP_INT_IRQ))
 881                 return IRQ_NONE;
 882
 883         if (int_status & CDNS_MCP_INT_RX_WL) {
 884                 cdns_read_response(cdns);
 885
 886                 if (cdns->defer) {
 887                         cdns_fill_msg_resp(cdns, cdns->defer->msg,
 888                                            cdns->defer->length, 0);
 889                         complete(&cdns->defer->complete);
 890                         cdns->defer = NULL;
 891                 } else {
 892                         complete(&cdns->tx_complete);
 893                 }
 894         }
 895
 896         if (int_status & CDNS_MCP_INT_PARITY) {
 897                 /* Parity error detected by Master */
 898                 dev_err_ratelimited(cdns->dev, "Parity error\n");
 899         }
 900
 901         if (int_status & CDNS_MCP_INT_CTRL_CLASH) {
 902                 /* Slave is driving bit slot during control word */
 903                 dev_err_ratelimited(cdns->dev, "Bus clash for control word\n");
 904         }
 905
 906         if (int_status & CDNS_MCP_INT_DATA_CLASH) {
 907                 /*
 908                  * Multiple slaves trying to drive bit slot, or issue with
 909                  * ownership of data bits or Slave gone bonkers
 910                  */
 911                 dev_err_ratelimited(cdns->dev, "Bus clash for data word\n");
 912         }
 913
 914         if (cdns->bus.params.m_data_mode != SDW_PORT_DATA_MODE_NORMAL &&
 915             int_status & CDNS_MCP_INT_DPINT) {
 916                 u32 port_intstat;
 917
 918                 /* just log which ports report an error */
 919                 port_intstat = cdns_readl(cdns, CDNS_MCP_PORT_INTSTAT);
 920                 dev_err_ratelimited(cdns->dev, "DP interrupt: PortIntStat %8x\n",
 921                                     port_intstat);
 922
 923                 /* clear status w/ write1 */
 924                 cdns_writel(cdns, CDNS_MCP_PORT_INTSTAT, port_intstat);
 925         }
 926
 927         if (int_status & CDNS_MCP_INT_SLAVE_MASK) {
 928                 /* Mask the Slave interrupt and wake thread */
 929                 cdns_updatel(cdns, CDNS_MCP_INTMASK,
 930                              CDNS_MCP_INT_SLAVE_MASK, 0);
 931
 932                 int_status &= ~CDNS_MCP_INT_SLAVE_MASK;
 933
 934                 /*
 935                  * Deal with possible race condition between interrupt
 936                  * handling and disabling interrupts on suspend.
 937                  *
 938                  * If the master is in the process of disabling
 939                  * interrupts, don't schedule a workqueue
 940                  */
 941                 if (cdns->interrupt_enabled)
 942                         schedule_work(&cdns->work);
 943         }
 944
 945         cdns_writel(cdns, CDNS_MCP_INTSTAT, int_status);
 946         return IRQ_HANDLED;
 947 }
 948 EXPORT_SYMBOL(sdw_cdns_irq);
 949
 950 /**
 951  * cdns_update_slave_status_work - update slave status in a work since we will need to handle
 952  * other interrupts eg. CDNS_MCP_INT_RX_WL during the update slave
 953  * process.
 954  * @work: cdns worker thread
 955  */
 956 static void cdns_update_slave_status_work(struct work_struct *work)
 957 {
 958         struct sdw_cdns *cdns =
 959                 container_of(work, struct sdw_cdns, work);
 960         u32 slave0, slave1;
 961         u64 slave_intstat;
 962
 963         slave0 = cdns_readl(cdns, CDNS_MCP_SLAVE_INTSTAT0);
 964         slave1 = cdns_readl(cdns, CDNS_MCP_SLAVE_INTSTAT1);
 965
 966         /* combine the two status */
 967         slave_intstat = ((u64)slave1 << 32) | slave0;
 968
 969         dev_dbg_ratelimited(cdns->dev, "Slave status change: 0x%llx\n", slave_intstat);
 970
 971         cdns_update_slave_status(cdns, slave_intstat);
 972         cdns_writel(cdns, CDNS_MCP_SLAVE_INTSTAT0, slave0);
 973         cdns_writel(cdns, CDNS_MCP_SLAVE_INTSTAT1, slave1);
 974
 975         /* clear and unmask Slave interrupt now */
 976         cdns_writel(cdns, CDNS_MCP_INTSTAT, CDNS_MCP_INT_SLAVE_MASK);
 977         cdns_updatel(cdns, CDNS_MCP_INTMASK,
 978                      CDNS_MCP_INT_SLAVE_MASK, CDNS_MCP_INT_SLAVE_MASK);
 979
 980 }
 981
 982 /* paranoia check to make sure self-cleared bits are indeed cleared */
 983 void sdw_cdns_check_self_clearing_bits(struct sdw_cdns *cdns, const char *string,
 984                                        bool initial_delay, int reset_iterations)
 985 {
 986         u32 mcp_control;
 987         u32 mcp_config_update;
 988         int i;
 989
 990         if (initial_delay)
 991                 usleep_range(1000, 1500);
 992
 993         mcp_control = cdns_readl(cdns, CDNS_MCP_CONTROL);
 994
 995         /* the following bits should be cleared immediately */
 996         if (mcp_control & CDNS_MCP_CONTROL_CMD_RST)
 997                 dev_err(cdns->dev, "%s failed: MCP_CONTROL_CMD_RST is not cleared\n", string);
 998         if (mcp_control & CDNS_MCP_CONTROL_SOFT_RST)
 999                 dev_err(cdns->dev, "%s failed: MCP_CONTROL_SOFT_RST is not cleared\n", string);
1000         if (mcp_control & CDNS_MCP_CONTROL_SW_RST)
1001                 dev_err(cdns->dev, "%s failed: MCP_CONTROL_SW_RST is not cleared\n", string);
1002         if (mcp_control & CDNS_MCP_CONTROL_CLK_STOP_CLR)
1003                 dev_err(cdns->dev, "%s failed: MCP_CONTROL_CLK_STOP_CLR is not cleared\n", string);
1004         mcp_config_update = cdns_readl(cdns, CDNS_MCP_CONFIG_UPDATE);
1005         if (mcp_config_update & CDNS_MCP_CONFIG_UPDATE_BIT)
1006                 dev_err(cdns->dev, "%s failed: MCP_CONFIG_UPDATE_BIT is not cleared\n", string);
1007
1008         i = 0;
1009         while (mcp_control & CDNS_MCP_CONTROL_HW_RST) {
1010                 if (i == reset_iterations) {
1011                         dev_err(cdns->dev, "%s failed: MCP_CONTROL_HW_RST is not cleared\n", string);
1012                         break;
1013                 }
1014
1015                 dev_dbg(cdns->dev, "%s: MCP_CONTROL_HW_RST is not cleared at iteration %d\n", string, i);
1016                 i++;
1017
1018                 usleep_range(1000, 1500);
1019                 mcp_control = cdns_readl(cdns, CDNS_MCP_CONTROL);
1020         }
1021
1022 }
1023 EXPORT_SYMBOL(sdw_cdns_check_self_clearing_bits);
1024
1025 /*
1026  * init routines
1027  */
1028
1029 /**
1030  * sdw_cdns_exit_reset() - Program reset parameters and start bus operations
1031  * @cdns: Cadence instance
1032  */
1033 int sdw_cdns_exit_reset(struct sdw_cdns *cdns)
1034 {
1035         /* keep reset delay unchanged to 4096 cycles */
1036
1037         /* use hardware generated reset */
1038         cdns_updatel(cdns, CDNS_MCP_CONTROL,
1039                      CDNS_MCP_CONTROL_HW_RST,
1040                      CDNS_MCP_CONTROL_HW_RST);
1041
1042         /* commit changes */
1043         cdns_updatel(cdns, CDNS_MCP_CONFIG_UPDATE,
1044                      CDNS_MCP_CONFIG_UPDATE_BIT,
1045                      CDNS_MCP_CONFIG_UPDATE_BIT);
1046
1047         /* don't wait here */
1048         return 0;
1049
1050 }
1051 EXPORT_SYMBOL(sdw_cdns_exit_reset);
1052
1053 /**
1054  * cdns_enable_slave_interrupts() - Enable SDW slave interrupts
1055  * @cdns: Cadence instance
1056  * @state: boolean for true/false
1057  */
1058 static void cdns_enable_slave_interrupts(struct sdw_cdns *cdns, bool state)
1059 {
1060         u32 mask;
1061
1062         mask = cdns_readl(cdns, CDNS_MCP_INTMASK);
1063         if (state)
1064                 mask |= CDNS_MCP_INT_SLAVE_MASK;
1065         else
1066                 mask &= ~CDNS_MCP_INT_SLAVE_MASK;
1067
1068         cdns_writel(cdns, CDNS_MCP_INTMASK, mask);
1069 }
1070
1071 /**
1072  * sdw_cdns_enable_interrupt() - Enable SDW interrupts
1073  * @cdns: Cadence instance
1074  * @state: True if we are trying to enable interrupt.
1075  */
1076 int sdw_cdns_enable_interrupt(struct sdw_cdns *cdns, bool state)
1077 {
1078         u32 slave_intmask0 = 0;
1079         u32 slave_intmask1 = 0;
1080         u32 mask = 0;
1081
1082         if (!state)
1083                 goto update_masks;
1084
1085         slave_intmask0 = CDNS_MCP_SLAVE_INTMASK0_MASK;
1086         slave_intmask1 = CDNS_MCP_SLAVE_INTMASK1_MASK;
1087
1088         /* enable detection of all slave state changes */
1089         mask = CDNS_MCP_INT_SLAVE_MASK;
1090
1091         /* enable detection of bus issues */
1092         mask |= CDNS_MCP_INT_CTRL_CLASH | CDNS_MCP_INT_DATA_CLASH |
1093                 CDNS_MCP_INT_PARITY;
1094
1095         /* port interrupt limited to test modes for now */
1096         if (cdns->bus.params.m_data_mode != SDW_PORT_DATA_MODE_NORMAL)
1097                 mask |= CDNS_MCP_INT_DPINT;
1098
1099         /* enable detection of RX fifo level */
1100         mask |= CDNS_MCP_INT_RX_WL;
1101
1102         /*
1103          * CDNS_MCP_INT_IRQ needs to be set otherwise all previous
1104          * settings are irrelevant
1105          */
1106         mask |= CDNS_MCP_INT_IRQ;
1107
1108         if (interrupt_mask) /* parameter override */
1109                 mask = interrupt_mask;
1110
1111 update_masks:
1112         /* clear slave interrupt status before enabling interrupt */
1113         if (state) {
1114                 u32 slave_state;
1115
1116                 slave_state = cdns_readl(cdns, CDNS_MCP_SLAVE_INTSTAT0);
1117                 cdns_writel(cdns, CDNS_MCP_SLAVE_INTSTAT0, slave_state);
1118                 slave_state = cdns_readl(cdns, CDNS_MCP_SLAVE_INTSTAT1);
1119                 cdns_writel(cdns, CDNS_MCP_SLAVE_INTSTAT1, slave_state);
1120         }
1121         cdns->interrupt_enabled = state;
1122
1123         /*
1124          * Complete any on-going status updates before updating masks,
1125          * and cancel queued status updates.
1126          *
1127          * There could be a race with a new interrupt thrown before
1128          * the 3 mask updates below are complete, so in the interrupt
1129          * we use the 'interrupt_enabled' status to prevent new work
1130          * from being queued.
1131          */
1132         if (!state)
1133                 cancel_work_sync(&cdns->work);
1134
1135         cdns_writel(cdns, CDNS_MCP_SLAVE_INTMASK0, slave_intmask0);
1136         cdns_writel(cdns, CDNS_MCP_SLAVE_INTMASK1, slave_intmask1);
1137         cdns_writel(cdns, CDNS_MCP_INTMASK, mask);
1138
1139         return 0;
1140 }
1141 EXPORT_SYMBOL(sdw_cdns_enable_interrupt);
1142
1143 static int cdns_allocate_pdi(struct sdw_cdns *cdns,
1144                              struct sdw_cdns_pdi **stream,
1145                              u32 num, u32 pdi_offset)
1146 {
1147         struct sdw_cdns_pdi *pdi;
1148         int i;
1149
1150         if (!num)
1151                 return 0;
1152
1153         pdi = devm_kcalloc(cdns->dev, num, sizeof(*pdi), GFP_KERNEL);
1154         if (!pdi)
1155                 return -ENOMEM;
1156
1157         for (i = 0; i < num; i++) {
1158                 pdi[i].num = i + pdi_offset;
1159         }
1160
1161         *stream = pdi;
1162         return 0;
1163 }
1164
1165 /**
1166  * sdw_cdns_pdi_init() - PDI initialization routine
1167  *
1168  * @cdns: Cadence instance
1169  * @config: Stream configurations
1170  */
1171 int sdw_cdns_pdi_init(struct sdw_cdns *cdns,
1172                       struct sdw_cdns_stream_config config)
1173 {
1174         struct sdw_cdns_streams *stream;
1175         int offset;
1176         int ret;
1177
1178         cdns->pcm.num_bd = config.pcm_bd;
1179         cdns->pcm.num_in = config.pcm_in;
1180         cdns->pcm.num_out = config.pcm_out;
1181
1182         /* Allocate PDIs for PCMs */
1183         stream = &cdns->pcm;
1184
1185         /* we allocate PDI0 and PDI1 which are used for Bulk */
1186         offset = 0;
1187
1188         ret = cdns_allocate_pdi(cdns, &stream->bd,
1189                                 stream->num_bd, offset);
1190         if (ret)
1191                 return ret;
1192
1193         offset += stream->num_bd;
1194
1195         ret = cdns_allocate_pdi(cdns, &stream->in,
1196                                 stream->num_in, offset);
1197         if (ret)
1198                 return ret;
1199
1200         offset += stream->num_in;
1201
1202         ret = cdns_allocate_pdi(cdns, &stream->out,
1203                                 stream->num_out, offset);
1204         if (ret)
1205                 return ret;
1206
1207         /* Update total number of PCM PDIs */
1208         stream->num_pdi = stream->num_bd + stream->num_in + stream->num_out;
1209         cdns->num_ports = stream->num_pdi;
1210
1211         return 0;
1212 }
1213 EXPORT_SYMBOL(sdw_cdns_pdi_init);
1214
1215 static u32 cdns_set_initial_frame_shape(int n_rows, int n_cols)
1216 {
1217         u32 val;
1218         int c;
1219         int r;
1220
1221         r = sdw_find_row_index(n_rows);
1222         c = sdw_find_col_index(n_cols);
1223
1224         val = FIELD_PREP(CDNS_MCP_FRAME_SHAPE_ROW_MASK, r);
1225         val |= FIELD_PREP(CDNS_MCP_FRAME_SHAPE_COL_MASK, c);
1226
1227         return val;
1228 }
1229
1230 static void cdns_init_clock_ctrl(struct sdw_cdns *cdns)
1231 {
1232         struct sdw_bus *bus = &cdns->bus;
1233         struct sdw_master_prop *prop = &bus->prop;
1234         u32 val;
1235         u32 ssp_interval;
1236         int divider;
1237
1238         /* Set clock divider */
1239         divider = (prop->mclk_freq / prop->max_clk_freq) - 1;
1240
1241         cdns_updatel(cdns, CDNS_MCP_CLK_CTRL0,
1242                      CDNS_MCP_CLK_MCLKD_MASK, divider);
1243         cdns_updatel(cdns, CDNS_MCP_CLK_CTRL1,
1244                      CDNS_MCP_CLK_MCLKD_MASK, divider);
1245
1246         /*
1247          * Frame shape changes after initialization have to be done
1248          * with the bank switch mechanism
1249          */
1250         val = cdns_set_initial_frame_shape(prop->default_row,
1251                                            prop->default_col);
1252         cdns_writel(cdns, CDNS_MCP_FRAME_SHAPE_INIT, val);
1253
1254         /* Set SSP interval to default value */
1255         ssp_interval = prop->default_frame_rate / SDW_CADENCE_GSYNC_HZ;
1256         cdns_writel(cdns, CDNS_MCP_SSP_CTRL0, ssp_interval);
1257         cdns_writel(cdns, CDNS_MCP_SSP_CTRL1, ssp_interval);
1258 }
1259
1260 /**
1261  * sdw_cdns_init() - Cadence initialization
1262  * @cdns: Cadence instance
1263  */
1264 int sdw_cdns_init(struct sdw_cdns *cdns)
1265 {
1266         u32 val;
1267
1268         cdns_init_clock_ctrl(cdns);
1269
1270         sdw_cdns_check_self_clearing_bits(cdns, __func__, false, 0);
1271
1272         /* reset msg_count to default value of FIFOLEVEL */
1273         cdns->msg_count = cdns_readl(cdns, CDNS_MCP_FIFOLEVEL);
1274
1275         /* flush command FIFOs */
1276         cdns_updatel(cdns, CDNS_MCP_CONTROL, CDNS_MCP_CONTROL_CMD_RST,
1277                      CDNS_MCP_CONTROL_CMD_RST);
1278
1279         /* Set cmd accept mode */
1280         cdns_updatel(cdns, CDNS_MCP_CONTROL, CDNS_MCP_CONTROL_CMD_ACCEPT,
1281                      CDNS_MCP_CONTROL_CMD_ACCEPT);
1282
1283         /* Configure mcp config */
1284         val = cdns_readl(cdns, CDNS_MCP_CONFIG);
1285
1286         /* enable bus operations with clock and data */
1287         val &= ~CDNS_MCP_CONFIG_OP;
1288         val |= CDNS_MCP_CONFIG_OP_NORMAL;
1289
1290         /* Set cmd mode for Tx and Rx cmds */
1291         val &= ~CDNS_MCP_CONFIG_CMD;
1292
1293         /* Disable sniffer mode */
1294         val &= ~CDNS_MCP_CONFIG_SNIFFER;
1295
1296         /* Disable auto bus release */
1297         val &= ~CDNS_MCP_CONFIG_BUS_REL;
1298
1299         if (cdns->bus.multi_link)
1300                 /* Set Multi-master mode to take gsync into account */
1301                 val |= CDNS_MCP_CONFIG_MMASTER;
1302
1303         /* leave frame delay to hardware default of 0x1F */
1304
1305         /* leave command retry to hardware default of 0 */
1306
1307         cdns_writel(cdns, CDNS_MCP_CONFIG, val);
1308
1309         /* changes will be committed later */
1310         return 0;
1311 }
1312 EXPORT_SYMBOL(sdw_cdns_init);
1313
1314 int cdns_bus_conf(struct sdw_bus *bus, struct sdw_bus_params *params)
1315 {
1316         struct sdw_master_prop *prop = &bus->prop;
1317         struct sdw_cdns *cdns = bus_to_cdns(bus);
1318         int mcp_clkctrl_off;
1319         int divider;
1320
1321         if (!params->curr_dr_freq) {
1322                 dev_err(cdns->dev, "NULL curr_dr_freq\n");
1323                 return -EINVAL;
1324         }
1325
1326         divider = prop->mclk_freq * SDW_DOUBLE_RATE_FACTOR /
1327                 params->curr_dr_freq;
1328         divider--; /* divider is 1/(N+1) */
1329
1330         if (params->next_bank)
1331                 mcp_clkctrl_off = CDNS_MCP_CLK_CTRL1;
1332         else
1333                 mcp_clkctrl_off = CDNS_MCP_CLK_CTRL0;
1334
1335         cdns_updatel(cdns, mcp_clkctrl_off, CDNS_MCP_CLK_MCLKD_MASK, divider);
1336
1337         return 0;
1338 }
1339 EXPORT_SYMBOL(cdns_bus_conf);
1340
1341 static int cdns_port_params(struct sdw_bus *bus,
1342                             struct sdw_port_params *p_params, unsigned int bank)
1343 {
1344         struct sdw_cdns *cdns = bus_to_cdns(bus);
1345         int dpn_config_off_source;
1346         int dpn_config_off_target;
1347         int target_num = p_params->num;
1348         int source_num = p_params->num;
1349         bool override = false;
1350         int dpn_config;
1351
1352         if (target_num == cdns->pdi_loopback_target &&
1353             cdns->pdi_loopback_source != -1) {
1354                 source_num = cdns->pdi_loopback_source;
1355                 override = true;
1356         }
1357
1358         if (bank) {
1359                 dpn_config_off_source = CDNS_DPN_B1_CONFIG(source_num);
1360                 dpn_config_off_target = CDNS_DPN_B1_CONFIG(target_num);
1361         } else {
1362                 dpn_config_off_source = CDNS_DPN_B0_CONFIG(source_num);
1363                 dpn_config_off_target = CDNS_DPN_B0_CONFIG(target_num);
1364         }
1365
1366         dpn_config = cdns_readl(cdns, dpn_config_off_source);
1367
1368         /* use port params if there is no loopback, otherwise use source as is */
1369         if (!override) {
1370                 u32p_replace_bits(&dpn_config, p_params->bps - 1, CDNS_DPN_CONFIG_WL);
1371                 u32p_replace_bits(&dpn_config, p_params->flow_mode, CDNS_DPN_CONFIG_PORT_FLOW);
1372                 u32p_replace_bits(&dpn_config, p_params->data_mode, CDNS_DPN_CONFIG_PORT_DAT);
1373         }
1374
1375         cdns_writel(cdns, dpn_config_off_target, dpn_config);
1376
1377         return 0;
1378 }
1379
1380 static int cdns_transport_params(struct sdw_bus *bus,
1381                                  struct sdw_transport_params *t_params,
1382                                  enum sdw_reg_bank bank)
1383 {
1384         struct sdw_cdns *cdns = bus_to_cdns(bus);
1385         int dpn_config;
1386         int dpn_config_off_source;
1387         int dpn_config_off_target;
1388         int dpn_hctrl;
1389         int dpn_hctrl_off_source;
1390         int dpn_hctrl_off_target;
1391         int dpn_offsetctrl;
1392         int dpn_offsetctrl_off_source;
1393         int dpn_offsetctrl_off_target;
1394         int dpn_samplectrl;
1395         int dpn_samplectrl_off_source;
1396         int dpn_samplectrl_off_target;
1397         int source_num = t_params->port_num;
1398         int target_num = t_params->port_num;
1399         bool override = false;
1400
1401         if (target_num == cdns->pdi_loopback_target &&
1402             cdns->pdi_loopback_source != -1) {
1403                 source_num = cdns->pdi_loopback_source;
1404                 override = true;
1405         }
1406
1407         /*
1408          * Note: Only full data port is supported on the Master side for
1409          * both PCM and PDM ports.
1410          */
1411
1412         if (bank) {
1413                 dpn_config_off_source = CDNS_DPN_B1_CONFIG(source_num);
1414                 dpn_hctrl_off_source = CDNS_DPN_B1_HCTRL(source_num);
1415                 dpn_offsetctrl_off_source = CDNS_DPN_B1_OFFSET_CTRL(source_num);
1416                 dpn_samplectrl_off_source = CDNS_DPN_B1_SAMPLE_CTRL(source_num);
1417
1418                 dpn_config_off_target = CDNS_DPN_B1_CONFIG(target_num);
1419                 dpn_hctrl_off_target = CDNS_DPN_B1_HCTRL(target_num);
1420                 dpn_offsetctrl_off_target = CDNS_DPN_B1_OFFSET_CTRL(target_num);
1421                 dpn_samplectrl_off_target = CDNS_DPN_B1_SAMPLE_CTRL(target_num);
1422
1423         } else {
1424                 dpn_config_off_source = CDNS_DPN_B0_CONFIG(source_num);
1425                 dpn_hctrl_off_source = CDNS_DPN_B0_HCTRL(source_num);
1426                 dpn_offsetctrl_off_source = CDNS_DPN_B0_OFFSET_CTRL(source_num);
1427                 dpn_samplectrl_off_source = CDNS_DPN_B0_SAMPLE_CTRL(source_num);
1428
1429                 dpn_config_off_target = CDNS_DPN_B0_CONFIG(target_num);
1430                 dpn_hctrl_off_target = CDNS_DPN_B0_HCTRL(target_num);
1431                 dpn_offsetctrl_off_target = CDNS_DPN_B0_OFFSET_CTRL(target_num);
1432                 dpn_samplectrl_off_target = CDNS_DPN_B0_SAMPLE_CTRL(target_num);
1433         }
1434
1435         dpn_config = cdns_readl(cdns, dpn_config_off_source);
1436         if (!override) {
1437                 u32p_replace_bits(&dpn_config, t_params->blk_grp_ctrl, CDNS_DPN_CONFIG_BGC);
1438                 u32p_replace_bits(&dpn_config, t_params->blk_pkg_mode, CDNS_DPN_CONFIG_BPM);
1439         }
1440         cdns_writel(cdns, dpn_config_off_target, dpn_config);
1441
1442         if (!override) {
1443                 dpn_offsetctrl = 0;
1444                 u32p_replace_bits(&dpn_offsetctrl, t_params->offset1, CDNS_DPN_OFFSET_CTRL_1);
1445                 u32p_replace_bits(&dpn_offsetctrl, t_params->offset2, CDNS_DPN_OFFSET_CTRL_2);
1446         } else {
1447                 dpn_offsetctrl = cdns_readl(cdns, dpn_offsetctrl_off_source);
1448         }
1449         cdns_writel(cdns, dpn_offsetctrl_off_target,  dpn_offsetctrl);
1450
1451         if (!override) {
1452                 dpn_hctrl = 0;
1453                 u32p_replace_bits(&dpn_hctrl, t_params->hstart, CDNS_DPN_HCTRL_HSTART);
1454                 u32p_replace_bits(&dpn_hctrl, t_params->hstop, CDNS_DPN_HCTRL_HSTOP);
1455                 u32p_replace_bits(&dpn_hctrl, t_params->lane_ctrl, CDNS_DPN_HCTRL_LCTRL);
1456         } else {
1457                 dpn_hctrl = cdns_readl(cdns, dpn_hctrl_off_source);
1458         }
1459         cdns_writel(cdns, dpn_hctrl_off_target, dpn_hctrl);
1460
1461         if (!override)
1462                 dpn_samplectrl = t_params->sample_interval - 1;
1463         else
1464                 dpn_samplectrl = cdns_readl(cdns, dpn_samplectrl_off_source);
1465         cdns_writel(cdns, dpn_samplectrl_off_target, dpn_samplectrl);
1466
1467         return 0;
1468 }
1469
1470 static int cdns_port_enable(struct sdw_bus *bus,
1471                             struct sdw_enable_ch *enable_ch, unsigned int bank)
1472 {
1473         struct sdw_cdns *cdns = bus_to_cdns(bus);
1474         int dpn_chnen_off, ch_mask;
1475
1476         if (bank)
1477                 dpn_chnen_off = CDNS_DPN_B1_CH_EN(enable_ch->port_num);
1478         else
1479                 dpn_chnen_off = CDNS_DPN_B0_CH_EN(enable_ch->port_num);
1480
1481         ch_mask = enable_ch->ch_mask * enable_ch->enable;
1482         cdns_writel(cdns, dpn_chnen_off, ch_mask);
1483
1484         return 0;
1485 }
1486
1487 static const struct sdw_master_port_ops cdns_port_ops = {
1488         .dpn_set_port_params = cdns_port_params,
1489         .dpn_set_port_transport_params = cdns_transport_params,
1490         .dpn_port_enable_ch = cdns_port_enable,
1491 };
1492
1493 /**
1494  * sdw_cdns_is_clock_stop: Check clock status
1495  *
1496  * @cdns: Cadence instance
1497  */
1498 bool sdw_cdns_is_clock_stop(struct sdw_cdns *cdns)
1499 {
1500         return !!(cdns_readl(cdns, CDNS_MCP_STAT) & CDNS_MCP_STAT_CLK_STOP);
1501 }
1502 EXPORT_SYMBOL(sdw_cdns_is_clock_stop);
1503
1504 /**
1505  * sdw_cdns_clock_stop: Cadence clock stop configuration routine
1506  *
1507  * @cdns: Cadence instance
1508  * @block_wake: prevent wakes if required by the platform
1509  */
1510 int sdw_cdns_clock_stop(struct sdw_cdns *cdns, bool block_wake)
1511 {
1512         bool slave_present = false;
1513         struct sdw_slave *slave;
1514         int ret;
1515
1516         sdw_cdns_check_self_clearing_bits(cdns, __func__, false, 0);
1517
1518         /* Check suspend status */
1519         if (sdw_cdns_is_clock_stop(cdns)) {
1520                 dev_dbg(cdns->dev, "Clock is already stopped\n");
1521                 return 0;
1522         }
1523
1524         /*
1525          * Before entering clock stop we mask the Slave
1526          * interrupts. This helps avoid having to deal with e.g. a
1527          * Slave becoming UNATTACHED while the clock is being stopped
1528          */
1529         cdns_enable_slave_interrupts(cdns, false);
1530
1531         /*
1532          * For specific platforms, it is required to be able to put
1533          * master into a state in which it ignores wake-up trials
1534          * in clock stop state
1535          */
1536         if (block_wake)
1537                 cdns_updatel(cdns, CDNS_MCP_CONTROL,
1538                              CDNS_MCP_CONTROL_BLOCK_WAKEUP,
1539                              CDNS_MCP_CONTROL_BLOCK_WAKEUP);
1540
1541         list_for_each_entry(slave, &cdns->bus.slaves, node) {
1542                 if (slave->status == SDW_SLAVE_ATTACHED ||
1543                     slave->status == SDW_SLAVE_ALERT) {
1544                         slave_present = true;
1545                         break;
1546                 }
1547         }
1548
1549         /* commit changes */
1550         ret = cdns_config_update(cdns);
1551         if (ret < 0) {
1552                 dev_err(cdns->dev, "%s: config_update failed\n", __func__);
1553                 return ret;
1554         }
1555
1556         /* Prepare slaves for clock stop */
1557         if (slave_present) {
1558                 ret = sdw_bus_prep_clk_stop(&cdns->bus);
1559                 if (ret < 0 && ret != -ENODATA) {
1560                         dev_err(cdns->dev, "prepare clock stop failed %d\n", ret);
1561                         return ret;
1562                 }
1563         }
1564
1565         /*
1566          * Enter clock stop mode and only report errors if there are
1567          * Slave devices present (ALERT or ATTACHED)
1568          */
1569         ret = sdw_bus_clk_stop(&cdns->bus);
1570         if (ret < 0 && slave_present && ret != -ENODATA) {
1571                 dev_err(cdns->dev, "bus clock stop failed %d\n", ret);
1572                 return ret;
1573         }
1574
1575         ret = cdns_set_wait(cdns, CDNS_MCP_STAT,
1576                             CDNS_MCP_STAT_CLK_STOP,
1577                             CDNS_MCP_STAT_CLK_STOP);
1578         if (ret < 0)
1579                 dev_err(cdns->dev, "Clock stop failed %d\n", ret);
1580
1581         return ret;
1582 }
1583 EXPORT_SYMBOL(sdw_cdns_clock_stop);
1584
1585 /**
1586  * sdw_cdns_clock_restart: Cadence PM clock restart configuration routine
1587  *
1588  * @cdns: Cadence instance
1589  * @bus_reset: context may be lost while in low power modes and the bus
1590  * may require a Severe Reset and re-enumeration after a wake.
1591  */
1592 int sdw_cdns_clock_restart(struct sdw_cdns *cdns, bool bus_reset)
1593 {
1594         int ret;
1595
1596         /* unmask Slave interrupts that were masked when stopping the clock */
1597         cdns_enable_slave_interrupts(cdns, true);
1598
1599         ret = cdns_clear_bit(cdns, CDNS_MCP_CONTROL,
1600                              CDNS_MCP_CONTROL_CLK_STOP_CLR);
1601         if (ret < 0) {
1602                 dev_err(cdns->dev, "Couldn't exit from clock stop\n");
1603                 return ret;
1604         }
1605
1606         ret = cdns_set_wait(cdns, CDNS_MCP_STAT, CDNS_MCP_STAT_CLK_STOP, 0);
1607         if (ret < 0) {
1608                 dev_err(cdns->dev, "clock stop exit failed %d\n", ret);
1609                 return ret;
1610         }
1611
1612         cdns_updatel(cdns, CDNS_MCP_CONTROL,
1613                      CDNS_MCP_CONTROL_BLOCK_WAKEUP, 0);
1614
1615         cdns_updatel(cdns, CDNS_MCP_CONTROL, CDNS_MCP_CONTROL_CMD_ACCEPT,
1616                      CDNS_MCP_CONTROL_CMD_ACCEPT);
1617
1618         if (!bus_reset) {
1619
1620                 /* enable bus operations with clock and data */
1621                 cdns_updatel(cdns, CDNS_MCP_CONFIG,
1622                              CDNS_MCP_CONFIG_OP,
1623                              CDNS_MCP_CONFIG_OP_NORMAL);
1624
1625                 ret = cdns_config_update(cdns);
1626                 if (ret < 0) {
1627                         dev_err(cdns->dev, "%s: config_update failed\n", __func__);
1628                         return ret;
1629                 }
1630
1631                 ret = sdw_bus_exit_clk_stop(&cdns->bus);
1632                 if (ret < 0)
1633                         dev_err(cdns->dev, "bus failed to exit clock stop %d\n", ret);
1634         }
1635
1636         return ret;
1637 }
1638 EXPORT_SYMBOL(sdw_cdns_clock_restart);
1639
1640 /**
1641  * sdw_cdns_probe() - Cadence probe routine
1642  * @cdns: Cadence instance
1643  */
1644 int sdw_cdns_probe(struct sdw_cdns *cdns)
1645 {
1646         init_completion(&cdns->tx_complete);
1647         cdns->bus.port_ops = &cdns_port_ops;
1648
1649         INIT_WORK(&cdns->work, cdns_update_slave_status_work);
1650         return 0;
1651 }
1652 EXPORT_SYMBOL(sdw_cdns_probe);
1653
1654 int cdns_set_sdw_stream(struct snd_soc_dai *dai,
1655                         void *stream, int direction)
1656 {
1657         struct sdw_cdns *cdns = snd_soc_dai_get_drvdata(dai);
1658         struct sdw_cdns_dma_data *dma;
1659
1660         if (stream) {
1661                 /* first paranoia check */
1662                 if (direction == SNDRV_PCM_STREAM_PLAYBACK)
1663                         dma = dai->playback_dma_data;
1664                 else
1665                         dma = dai->capture_dma_data;
1666
1667                 if (dma) {
1668                         dev_err(dai->dev,
1669                                 "dma_data already allocated for dai %s\n",
1670                                 dai->name);
1671                         return -EINVAL;
1672                 }
1673
1674                 /* allocate and set dma info */
1675                 dma = kzalloc(sizeof(*dma), GFP_KERNEL);
1676                 if (!dma)
1677                         return -ENOMEM;
1678
1679                 dma->stream_type = SDW_STREAM_PCM;
1680
1681                 dma->bus = &cdns->bus;
1682                 dma->link_id = cdns->instance;
1683
1684                 dma->stream = stream;
1685
1686                 if (direction == SNDRV_PCM_STREAM_PLAYBACK)
1687                         dai->playback_dma_data = dma;
1688                 else
1689                         dai->capture_dma_data = dma;
1690         } else {
1691                 /* for NULL stream we release allocated dma_data */
1692                 if (direction == SNDRV_PCM_STREAM_PLAYBACK) {
1693                         kfree(dai->playback_dma_data);
1694                         dai->playback_dma_data = NULL;
1695                 } else {
1696                         kfree(dai->capture_dma_data);
1697                         dai->capture_dma_data = NULL;
1698                 }
1699         }
1700         return 0;
1701 }
1702 EXPORT_SYMBOL(cdns_set_sdw_stream);
1703
1704 /**
1705  * cdns_find_pdi() - Find a free PDI
1706  *
1707  * @cdns: Cadence instance
1708  * @offset: Starting offset
1709  * @num: Number of PDIs
1710  * @pdi: PDI instances
1711  * @dai_id: DAI id
1712  *
1713  * Find a PDI for a given PDI array. The PDI num and dai_id are
1714  * expected to match, return NULL otherwise.
1715  */
1716 static struct sdw_cdns_pdi *cdns_find_pdi(struct sdw_cdns *cdns,
1717                                           unsigned int offset,
1718                                           unsigned int num,
1719                                           struct sdw_cdns_pdi *pdi,
1720                                           int dai_id)
1721 {
1722         int i;
1723
1724         for (i = offset; i < offset + num; i++)
1725                 if (pdi[i].num == dai_id)
1726                         return &pdi[i];
1727
1728         return NULL;
1729 }
1730
1731 /**
1732  * sdw_cdns_config_stream: Configure a stream
1733  *
1734  * @cdns: Cadence instance
1735  * @ch: Channel count
1736  * @dir: Data direction
1737  * @pdi: PDI to be used
1738  */
1739 void sdw_cdns_config_stream(struct sdw_cdns *cdns,
1740                             u32 ch, u32 dir, struct sdw_cdns_pdi *pdi)
1741 {
1742         u32 offset, val = 0;
1743
1744         if (dir == SDW_DATA_DIR_RX) {
1745                 val = CDNS_PORTCTRL_DIRN;
1746
1747                 if (cdns->bus.params.m_data_mode != SDW_PORT_DATA_MODE_NORMAL)
1748                         val |= CDNS_PORTCTRL_TEST_FAILED;
1749         }
1750         offset = CDNS_PORTCTRL + pdi->num * CDNS_PORT_OFFSET;
1751         cdns_updatel(cdns, offset,
1752                      CDNS_PORTCTRL_DIRN | CDNS_PORTCTRL_TEST_FAILED,
1753                      val);
1754
1755         val = pdi->num;
1756         val |= CDNS_PDI_CONFIG_SOFT_RESET;
1757         val |= FIELD_PREP(CDNS_PDI_CONFIG_CHANNEL, (1 << ch) - 1);
1758         cdns_writel(cdns, CDNS_PDI_CONFIG(pdi->num), val);
1759 }
1760 EXPORT_SYMBOL(sdw_cdns_config_stream);
1761
1762 /**
1763  * sdw_cdns_alloc_pdi() - Allocate a PDI
1764  *
1765  * @cdns: Cadence instance
1766  * @stream: Stream to be allocated
1767  * @ch: Channel count
1768  * @dir: Data direction
1769  * @dai_id: DAI id
1770  */
1771 struct sdw_cdns_pdi *sdw_cdns_alloc_pdi(struct sdw_cdns *cdns,
1772                                         struct sdw_cdns_streams *stream,
1773                                         u32 ch, u32 dir, int dai_id)
1774 {
1775         struct sdw_cdns_pdi *pdi = NULL;
1776
1777         if (dir == SDW_DATA_DIR_RX)
1778                 pdi = cdns_find_pdi(cdns, 0, stream->num_in, stream->in,
1779                                     dai_id);
1780         else
1781                 pdi = cdns_find_pdi(cdns, 0, stream->num_out, stream->out,
1782                                     dai_id);
1783
1784         /* check if we found a PDI, else find in bi-directional */
1785         if (!pdi)
1786                 pdi = cdns_find_pdi(cdns, 2, stream->num_bd, stream->bd,
1787                                     dai_id);
1788
1789         if (pdi) {
1790                 pdi->l_ch_num = 0;
1791                 pdi->h_ch_num = ch - 1;
1792                 pdi->dir = dir;
1793                 pdi->ch_count = ch;
1794         }
1795
1796         return pdi;
1797 }
1798 EXPORT_SYMBOL(sdw_cdns_alloc_pdi);
1799
1800 MODULE_LICENSE("Dual BSD/GPL");
1801 MODULE_DESCRIPTION("Cadence Soundwire Library");