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 /* FIFO can hold 8 commands */
 131 #define CDNS_MCP_CMD_LEN                        8
 132 #define CDNS_MCP_CMD_WORD_LEN                   0x4
 133
 134 #define CDNS_MCP_CMD_SSP_TAG                    BIT(31)
 135 #define CDNS_MCP_CMD_COMMAND                    GENMASK(30, 28)
 136 #define CDNS_MCP_CMD_DEV_ADDR                   GENMASK(27, 24)
 137 #define CDNS_MCP_CMD_REG_ADDR                   GENMASK(23, 8)
 138 #define CDNS_MCP_CMD_REG_DATA                   GENMASK(7, 0)
 139
 140 #define CDNS_MCP_CMD_READ                       2
 141 #define CDNS_MCP_CMD_WRITE                      3
 142
 143 #define CDNS_MCP_RESP_RDATA                     GENMASK(15, 8)
 144 #define CDNS_MCP_RESP_ACK                       BIT(0)
 145 #define CDNS_MCP_RESP_NACK                      BIT(1)
 146
 147 #define CDNS_DP_SIZE                            128
 148
 149 #define CDNS_DPN_B0_CONFIG(n)                   (0x100 + CDNS_DP_SIZE * (n))
 150 #define CDNS_DPN_B0_CH_EN(n)                    (0x104 + CDNS_DP_SIZE * (n))
 151 #define CDNS_DPN_B0_SAMPLE_CTRL(n)              (0x108 + CDNS_DP_SIZE * (n))
 152 #define CDNS_DPN_B0_OFFSET_CTRL(n)              (0x10C + CDNS_DP_SIZE * (n))
 153 #define CDNS_DPN_B0_HCTRL(n)                    (0x110 + CDNS_DP_SIZE * (n))
 154 #define CDNS_DPN_B0_ASYNC_CTRL(n)               (0x114 + CDNS_DP_SIZE * (n))
 155
 156 #define CDNS_DPN_B1_CONFIG(n)                   (0x118 + CDNS_DP_SIZE * (n))
 157 #define CDNS_DPN_B1_CH_EN(n)                    (0x11C + CDNS_DP_SIZE * (n))
 158 #define CDNS_DPN_B1_SAMPLE_CTRL(n)              (0x120 + CDNS_DP_SIZE * (n))
 159 #define CDNS_DPN_B1_OFFSET_CTRL(n)              (0x124 + CDNS_DP_SIZE * (n))
 160 #define CDNS_DPN_B1_HCTRL(n)                    (0x128 + CDNS_DP_SIZE * (n))
 161 #define CDNS_DPN_B1_ASYNC_CTRL(n)               (0x12C + CDNS_DP_SIZE * (n))
 162
 163 #define CDNS_DPN_CONFIG_BPM                     BIT(18)
 164 #define CDNS_DPN_CONFIG_BGC                     GENMASK(17, 16)
 165 #define CDNS_DPN_CONFIG_WL                      GENMASK(12, 8)
 166 #define CDNS_DPN_CONFIG_PORT_DAT                GENMASK(3, 2)
 167 #define CDNS_DPN_CONFIG_PORT_FLOW               GENMASK(1, 0)
 168
 169 #define CDNS_DPN_SAMPLE_CTRL_SI                 GENMASK(15, 0)
 170
 171 #define CDNS_DPN_OFFSET_CTRL_1                  GENMASK(7, 0)
 172 #define CDNS_DPN_OFFSET_CTRL_2                  GENMASK(15, 8)
 173
 174 #define CDNS_DPN_HCTRL_HSTOP                    GENMASK(3, 0)
 175 #define CDNS_DPN_HCTRL_HSTART                   GENMASK(7, 4)
 176 #define CDNS_DPN_HCTRL_LCTRL                    GENMASK(10, 8)
 177
 178 #define CDNS_PORTCTRL                           0x130
 179 #define CDNS_PORTCTRL_TEST_FAILED               BIT(1)
 180 #define CDNS_PORTCTRL_DIRN                      BIT(7)
 181 #define CDNS_PORTCTRL_BANK_INVERT               BIT(8)
 182
 183 #define CDNS_PORT_OFFSET                        0x80
 184
 185 #define CDNS_PDI_CONFIG(n)                      (0x1100 + (n) * 16)
 186
 187 #define CDNS_PDI_CONFIG_SOFT_RESET              BIT(24)
 188 #define CDNS_PDI_CONFIG_CHANNEL                 GENMASK(15, 8)
 189 #define CDNS_PDI_CONFIG_PORT                    GENMASK(4, 0)
 190
 191 /* Driver defaults */
 192 #define CDNS_TX_TIMEOUT                         500
 193
 194 #define CDNS_SCP_RX_FIFOLEVEL                   0x2
 195
 196 /*
 197  * register accessor helpers
 198  */
 199 static inline u32 cdns_readl(struct sdw_cdns *cdns, int offset)
 200 {
 201         return readl(cdns->registers + offset);
 202 }
 203
 204 static inline void cdns_writel(struct sdw_cdns *cdns, int offset, u32 value)
 205 {
 206         writel(value, cdns->registers + offset);
 207 }
 208
 209 static inline void cdns_updatel(struct sdw_cdns *cdns,
 210                                 int offset, u32 mask, u32 val)
 211 {
 212         u32 tmp;
 213
 214         tmp = cdns_readl(cdns, offset);
 215         tmp = (tmp & ~mask) | val;
 216         cdns_writel(cdns, offset, tmp);
 217 }
 218
 219 static int cdns_set_wait(struct sdw_cdns *cdns, int offset, u32 mask, u32 value)
 220 {
 221         int timeout = 10;
 222         u32 reg_read;
 223
 224         /* Wait for bit to be set */
 225         do {
 226                 reg_read = readl(cdns->registers + offset);
 227                 if ((reg_read & mask) == value)
 228                         return 0;
 229
 230                 timeout--;
 231                 usleep_range(50, 100);
 232         } while (timeout != 0);
 233
 234         return -ETIMEDOUT;
 235 }
 236
 237 static int cdns_clear_bit(struct sdw_cdns *cdns, int offset, u32 value)
 238 {
 239         writel(value, cdns->registers + offset);
 240
 241         /* Wait for bit to be self cleared */
 242         return cdns_set_wait(cdns, offset, value, 0);
 243 }
 244
 245 /*
 246  * all changes to the MCP_CONFIG, MCP_CONTROL, MCP_CMDCTRL and MCP_PHYCTRL
 247  * need to be confirmed with a write to MCP_CONFIG_UPDATE
 248  */
 249 static int cdns_config_update(struct sdw_cdns *cdns)
 250 {
 251         int ret;
 252
 253         if (sdw_cdns_is_clock_stop(cdns)) {
 254                 dev_err(cdns->dev, "Cannot program MCP_CONFIG_UPDATE in ClockStopMode\n");
 255                 return -EINVAL;
 256         }
 257
 258         ret = cdns_clear_bit(cdns, CDNS_MCP_CONFIG_UPDATE,
 259                              CDNS_MCP_CONFIG_UPDATE_BIT);
 260         if (ret < 0)
 261                 dev_err(cdns->dev, "Config update timedout\n");
 262
 263         return ret;
 264 }
 265
 266 /*
 267  * debugfs
 268  */
 269 #ifdef CONFIG_DEBUG_FS
 270
 271 #define RD_BUF (2 * PAGE_SIZE)
 272
 273 static ssize_t cdns_sprintf(struct sdw_cdns *cdns,
 274                             char *buf, size_t pos, unsigned int reg)
 275 {
 276         return scnprintf(buf + pos, RD_BUF - pos,
 277                          "%4x\t%8x\n", reg, cdns_readl(cdns, reg));
 278 }
 279
 280 static int cdns_reg_show(struct seq_file *s, void *data)
 281 {
 282         struct sdw_cdns *cdns = s->private;
 283         char *buf;
 284         ssize_t ret;
 285         int num_ports;
 286         int i, j;
 287
 288         buf = kzalloc(RD_BUF, GFP_KERNEL);
 289         if (!buf)
 290                 return -ENOMEM;
 291
 292         ret = scnprintf(buf, RD_BUF, "Register  Value\n");
 293         ret += scnprintf(buf + ret, RD_BUF - ret, "\nMCP Registers\n");
 294         /* 8 MCP registers */
 295         for (i = CDNS_MCP_CONFIG; i <= CDNS_MCP_PHYCTRL; i += sizeof(u32))
 296                 ret += cdns_sprintf(cdns, buf, ret, i);
 297
 298         ret += scnprintf(buf + ret, RD_BUF - ret,
 299                          "\nStatus & Intr Registers\n");
 300         /* 13 Status & Intr registers (offsets 0x70 and 0x74 not defined) */
 301         for (i = CDNS_MCP_STAT; i <=  CDNS_MCP_FIFOSTAT; i += sizeof(u32))
 302                 ret += cdns_sprintf(cdns, buf, ret, i);
 303
 304         ret += scnprintf(buf + ret, RD_BUF - ret,
 305                          "\nSSP & Clk ctrl Registers\n");
 306         ret += cdns_sprintf(cdns, buf, ret, CDNS_MCP_SSP_CTRL0);
 307         ret += cdns_sprintf(cdns, buf, ret, CDNS_MCP_SSP_CTRL1);
 308         ret += cdns_sprintf(cdns, buf, ret, CDNS_MCP_CLK_CTRL0);
 309         ret += cdns_sprintf(cdns, buf, ret, CDNS_MCP_CLK_CTRL1);
 310
 311         ret += scnprintf(buf + ret, RD_BUF - ret,
 312                          "\nDPn B0 Registers\n");
 313
 314         num_ports = cdns->num_ports;
 315
 316         for (i = 0; i < num_ports; i++) {
 317                 ret += scnprintf(buf + ret, RD_BUF - ret,
 318                                  "\nDP-%d\n", i);
 319                 for (j = CDNS_DPN_B0_CONFIG(i);
 320                      j < CDNS_DPN_B0_ASYNC_CTRL(i); j += sizeof(u32))
 321                         ret += cdns_sprintf(cdns, buf, ret, j);
 322         }
 323
 324         ret += scnprintf(buf + ret, RD_BUF - ret,
 325                          "\nDPn B1 Registers\n");
 326         for (i = 0; i < num_ports; i++) {
 327                 ret += scnprintf(buf + ret, RD_BUF - ret,
 328                                  "\nDP-%d\n", i);
 329
 330                 for (j = CDNS_DPN_B1_CONFIG(i);
 331                      j < CDNS_DPN_B1_ASYNC_CTRL(i); j += sizeof(u32))
 332                         ret += cdns_sprintf(cdns, buf, ret, j);
 333         }
 334
 335         ret += scnprintf(buf + ret, RD_BUF - ret,
 336                          "\nDPn Control Registers\n");
 337         for (i = 0; i < num_ports; i++)
 338                 ret += cdns_sprintf(cdns, buf, ret,
 339                                 CDNS_PORTCTRL + i * CDNS_PORT_OFFSET);
 340
 341         ret += scnprintf(buf + ret, RD_BUF - ret,
 342                          "\nPDIn Config Registers\n");
 343
 344         /* number of PDI and ports is interchangeable */
 345         for (i = 0; i < num_ports; i++)
 346                 ret += cdns_sprintf(cdns, buf, ret, CDNS_PDI_CONFIG(i));
 347
 348         seq_printf(s, "%s", buf);
 349         kfree(buf);
 350
 351         return 0;
 352 }
 353 DEFINE_SHOW_ATTRIBUTE(cdns_reg);
 354
 355 static int cdns_hw_reset(void *data, u64 value)
 356 {
 357         struct sdw_cdns *cdns = data;
 358         int ret;
 359
 360         if (value != 1)
 361                 return -EINVAL;
 362
 363         /* Userspace changed the hardware state behind the kernel's back */
 364         add_taint(TAINT_USER, LOCKDEP_STILL_OK);
 365
 366         ret = sdw_cdns_exit_reset(cdns);
 367
 368         dev_dbg(cdns->dev, "link hw_reset done: %d\n", ret);
 369
 370         return ret;
 371 }
 372
 373 DEFINE_DEBUGFS_ATTRIBUTE(cdns_hw_reset_fops, NULL, cdns_hw_reset, "%llu\n");
 374
 375 static int cdns_parity_error_injection(void *data, u64 value)
 376 {
 377         struct sdw_cdns *cdns = data;
 378         struct sdw_bus *bus;
 379         int ret;
 380
 381         if (value != 1)
 382                 return -EINVAL;
 383
 384         bus = &cdns->bus;
 385
 386         /*
 387          * Resume Master device. If this results in a bus reset, the
 388          * Slave devices will re-attach and be re-enumerated.
 389          */
 390         ret = pm_runtime_resume_and_get(bus->dev);
 391         if (ret < 0 && ret != -EACCES) {
 392                 dev_err_ratelimited(cdns->dev,
 393                                     "pm_runtime_resume_and_get failed in %s, ret %d\n",
 394                                     __func__, ret);
 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         if (msg->flags == SDW_MSG_FLAG_READ) {
 549                 /* fill response */
 550                 for (i = 0; i < count; i++)
 551                         msg->buf[i + offset] = FIELD_GET(CDNS_MCP_RESP_RDATA,
 552                                                          cdns->response_buf[i]);
 553         }
 554
 555         return SDW_CMD_OK;
 556 }
 557
 558 static void cdns_read_response(struct sdw_cdns *cdns)
 559 {
 560         u32 num_resp, cmd_base;
 561         int i;
 562
 563         /* RX_FIFO_AVAIL can be 2 entries more than the FIFO size */
 564         BUILD_BUG_ON(ARRAY_SIZE(cdns->response_buf) < CDNS_MCP_CMD_LEN + 2);
 565
 566         num_resp = cdns_readl(cdns, CDNS_MCP_FIFOSTAT);
 567         num_resp &= CDNS_MCP_RX_FIFO_AVAIL;
 568         if (num_resp > ARRAY_SIZE(cdns->response_buf)) {
 569                 dev_warn(cdns->dev, "RX AVAIL %d too long\n", num_resp);
 570                 num_resp = ARRAY_SIZE(cdns->response_buf);
 571         }
 572
 573         cmd_base = CDNS_MCP_CMD_BASE;
 574
 575         for (i = 0; i < num_resp; i++) {
 576                 cdns->response_buf[i] = cdns_readl(cdns, cmd_base);
 577                 cmd_base += CDNS_MCP_CMD_WORD_LEN;
 578         }
 579 }
 580
 581 static enum sdw_command_response
 582 _cdns_xfer_msg(struct sdw_cdns *cdns, struct sdw_msg *msg, int cmd,
 583                int offset, int count, bool defer)
 584 {
 585         unsigned long time;
 586         u32 base, i, data;
 587         u16 addr;
 588
 589         /* Program the watermark level for RX FIFO */
 590         if (cdns->msg_count != count) {
 591                 cdns_writel(cdns, CDNS_MCP_FIFOLEVEL, count);
 592                 cdns->msg_count = count;
 593         }
 594
 595         base = CDNS_MCP_CMD_BASE;
 596         addr = msg->addr + offset;
 597
 598         for (i = 0; i < count; i++) {
 599                 data = FIELD_PREP(CDNS_MCP_CMD_DEV_ADDR, msg->dev_num);
 600                 data |= FIELD_PREP(CDNS_MCP_CMD_COMMAND, cmd);
 601                 data |= FIELD_PREP(CDNS_MCP_CMD_REG_ADDR, addr);
 602                 addr++;
 603
 604                 if (msg->flags == SDW_MSG_FLAG_WRITE)
 605                         data |= msg->buf[i + offset];
 606
 607                 data |= FIELD_PREP(CDNS_MCP_CMD_SSP_TAG, msg->ssp_sync);
 608                 cdns_writel(cdns, base, data);
 609                 base += CDNS_MCP_CMD_WORD_LEN;
 610         }
 611
 612         if (defer)
 613                 return SDW_CMD_OK;
 614
 615         /* wait for timeout or response */
 616         time = wait_for_completion_timeout(&cdns->tx_complete,
 617                                            msecs_to_jiffies(CDNS_TX_TIMEOUT));
 618         if (!time) {
 619                 dev_err(cdns->dev, "IO transfer timed out, cmd %d device %d addr %x len %d\n",
 620                         cmd, msg->dev_num, msg->addr, msg->len);
 621                 msg->len = 0;
 622
 623                 /* Drain anything in the RX_FIFO */
 624                 cdns_read_response(cdns);
 625
 626                 return SDW_CMD_TIMEOUT;
 627         }
 628
 629         return cdns_fill_msg_resp(cdns, msg, count, offset);
 630 }
 631
 632 static enum sdw_command_response
 633 cdns_program_scp_addr(struct sdw_cdns *cdns, struct sdw_msg *msg)
 634 {
 635         int nack = 0, no_ack = 0;
 636         unsigned long time;
 637         u32 data[2], base;
 638         int i;
 639
 640         /* Program the watermark level for RX FIFO */
 641         if (cdns->msg_count != CDNS_SCP_RX_FIFOLEVEL) {
 642                 cdns_writel(cdns, CDNS_MCP_FIFOLEVEL, CDNS_SCP_RX_FIFOLEVEL);
 643                 cdns->msg_count = CDNS_SCP_RX_FIFOLEVEL;
 644         }
 645
 646         data[0] = FIELD_PREP(CDNS_MCP_CMD_DEV_ADDR, msg->dev_num);
 647         data[0] |= FIELD_PREP(CDNS_MCP_CMD_COMMAND, 0x3);
 648         data[1] = data[0];
 649
 650         data[0] |= FIELD_PREP(CDNS_MCP_CMD_REG_ADDR, SDW_SCP_ADDRPAGE1);
 651         data[1] |= FIELD_PREP(CDNS_MCP_CMD_REG_ADDR, SDW_SCP_ADDRPAGE2);
 652
 653         data[0] |= msg->addr_page1;
 654         data[1] |= msg->addr_page2;
 655
 656         base = CDNS_MCP_CMD_BASE;
 657         cdns_writel(cdns, base, data[0]);
 658         base += CDNS_MCP_CMD_WORD_LEN;
 659         cdns_writel(cdns, base, data[1]);
 660
 661         time = wait_for_completion_timeout(&cdns->tx_complete,
 662                                            msecs_to_jiffies(CDNS_TX_TIMEOUT));
 663         if (!time) {
 664                 dev_err(cdns->dev, "SCP Msg trf timed out\n");
 665                 msg->len = 0;
 666                 return SDW_CMD_TIMEOUT;
 667         }
 668
 669         /* check response the writes */
 670         for (i = 0; i < 2; i++) {
 671                 if (!(cdns->response_buf[i] & CDNS_MCP_RESP_ACK)) {
 672                         no_ack = 1;
 673                         dev_err(cdns->dev, "Program SCP Ack not received\n");
 674                         if (cdns->response_buf[i] & CDNS_MCP_RESP_NACK) {
 675                                 nack = 1;
 676                                 dev_err(cdns->dev, "Program SCP NACK received\n");
 677                         }
 678                 }
 679         }
 680
 681         /* For NACK, NO ack, don't return err if we are in Broadcast mode */
 682         if (nack) {
 683                 dev_err_ratelimited(cdns->dev,
 684                                     "SCP_addrpage NACKed for Slave %d\n", msg->dev_num);
 685                 return SDW_CMD_FAIL;
 686         }
 687
 688         if (no_ack) {
 689                 dev_dbg_ratelimited(cdns->dev,
 690                                     "SCP_addrpage ignored for Slave %d\n", msg->dev_num);
 691                 return SDW_CMD_IGNORED;
 692         }
 693
 694         return SDW_CMD_OK;
 695 }
 696
 697 static int cdns_prep_msg(struct sdw_cdns *cdns, struct sdw_msg *msg, int *cmd)
 698 {
 699         int ret;
 700
 701         if (msg->page) {
 702                 ret = cdns_program_scp_addr(cdns, msg);
 703                 if (ret) {
 704                         msg->len = 0;
 705                         return ret;
 706                 }
 707         }
 708
 709         switch (msg->flags) {
 710         case SDW_MSG_FLAG_READ:
 711                 *cmd = CDNS_MCP_CMD_READ;
 712                 break;
 713
 714         case SDW_MSG_FLAG_WRITE:
 715                 *cmd = CDNS_MCP_CMD_WRITE;
 716                 break;
 717
 718         default:
 719                 dev_err(cdns->dev, "Invalid msg cmd: %d\n", msg->flags);
 720                 return -EINVAL;
 721         }
 722
 723         return 0;
 724 }
 725
 726 enum sdw_command_response
 727 cdns_xfer_msg(struct sdw_bus *bus, struct sdw_msg *msg)
 728 {
 729         struct sdw_cdns *cdns = bus_to_cdns(bus);
 730         int cmd = 0, ret, i;
 731
 732         ret = cdns_prep_msg(cdns, msg, &cmd);
 733         if (ret)
 734                 return SDW_CMD_FAIL_OTHER;
 735
 736         for (i = 0; i < msg->len / CDNS_MCP_CMD_LEN; i++) {
 737                 ret = _cdns_xfer_msg(cdns, msg, cmd, i * CDNS_MCP_CMD_LEN,
 738                                      CDNS_MCP_CMD_LEN, false);
 739                 if (ret != SDW_CMD_OK)
 740                         return ret;
 741         }
 742
 743         if (!(msg->len % CDNS_MCP_CMD_LEN))
 744                 return SDW_CMD_OK;
 745
 746         return _cdns_xfer_msg(cdns, msg, cmd, i * CDNS_MCP_CMD_LEN,
 747                               msg->len % CDNS_MCP_CMD_LEN, false);
 748 }
 749 EXPORT_SYMBOL(cdns_xfer_msg);
 750
 751 enum sdw_command_response
 752 cdns_xfer_msg_defer(struct sdw_bus *bus)
 753 {
 754         struct sdw_cdns *cdns = bus_to_cdns(bus);
 755         struct sdw_defer *defer = &bus->defer_msg;
 756         struct sdw_msg *msg = defer->msg;
 757         int cmd = 0, ret;
 758
 759         /* for defer only 1 message is supported */
 760         if (msg->len > 1)
 761                 return -ENOTSUPP;
 762
 763         ret = cdns_prep_msg(cdns, msg, &cmd);
 764         if (ret)
 765                 return SDW_CMD_FAIL_OTHER;
 766
 767         return _cdns_xfer_msg(cdns, msg, cmd, 0, msg->len, true);
 768 }
 769 EXPORT_SYMBOL(cdns_xfer_msg_defer);
 770
 771 u32 cdns_read_ping_status(struct sdw_bus *bus)
 772 {
 773         struct sdw_cdns *cdns = bus_to_cdns(bus);
 774
 775         return cdns_readl(cdns, CDNS_MCP_SLAVE_STAT);
 776 }
 777 EXPORT_SYMBOL(cdns_read_ping_status);
 778
 779 /*
 780  * IRQ handling
 781  */
 782
 783 static int cdns_update_slave_status(struct sdw_cdns *cdns,
 784                                     u64 slave_intstat)
 785 {
 786         enum sdw_slave_status status[SDW_MAX_DEVICES + 1];
 787         bool is_slave = false;
 788         u32 mask;
 789         u32 val;
 790         int i, set_status;
 791
 792         memset(status, 0, sizeof(status));
 793
 794         for (i = 0; i <= SDW_MAX_DEVICES; i++) {
 795                 mask = (slave_intstat >> (i * CDNS_MCP_SLAVE_STATUS_NUM)) &
 796                         CDNS_MCP_SLAVE_STATUS_BITS;
 797
 798                 set_status = 0;
 799
 800                 if (mask) {
 801                         is_slave = true;
 802
 803                         if (mask & CDNS_MCP_SLAVE_INTSTAT_RESERVED) {
 804                                 status[i] = SDW_SLAVE_RESERVED;
 805                                 set_status++;
 806                         }
 807
 808                         if (mask & CDNS_MCP_SLAVE_INTSTAT_ATTACHED) {
 809                                 status[i] = SDW_SLAVE_ATTACHED;
 810                                 set_status++;
 811                         }
 812
 813                         if (mask & CDNS_MCP_SLAVE_INTSTAT_ALERT) {
 814                                 status[i] = SDW_SLAVE_ALERT;
 815                                 set_status++;
 816                         }
 817
 818                         if (mask & CDNS_MCP_SLAVE_INTSTAT_NPRESENT) {
 819                                 status[i] = SDW_SLAVE_UNATTACHED;
 820                                 set_status++;
 821                         }
 822                 }
 823
 824                 /*
 825                  * check that there was a single reported Slave status and when
 826                  * there is not use the latest status extracted from PING commands
 827                  */
 828                 if (set_status != 1) {
 829                         val = cdns_readl(cdns, CDNS_MCP_SLAVE_STAT);
 830                         val >>= (i * 2);
 831
 832                         switch (val & 0x3) {
 833                         case 0:
 834                                 status[i] = SDW_SLAVE_UNATTACHED;
 835                                 break;
 836                         case 1:
 837                                 status[i] = SDW_SLAVE_ATTACHED;
 838                                 break;
 839                         case 2:
 840                                 status[i] = SDW_SLAVE_ALERT;
 841                                 break;
 842                         case 3:
 843                         default:
 844                                 status[i] = SDW_SLAVE_RESERVED;
 845                                 break;
 846                         }
 847                 }
 848         }
 849
 850         if (is_slave)
 851                 return sdw_handle_slave_status(&cdns->bus, status);
 852
 853         return 0;
 854 }
 855
 856 /**
 857  * sdw_cdns_irq() - Cadence interrupt handler
 858  * @irq: irq number
 859  * @dev_id: irq context
 860  */
 861 irqreturn_t sdw_cdns_irq(int irq, void *dev_id)
 862 {
 863         struct sdw_cdns *cdns = dev_id;
 864         u32 int_status;
 865
 866         /* Check if the link is up */
 867         if (!cdns->link_up)
 868                 return IRQ_NONE;
 869
 870         int_status = cdns_readl(cdns, CDNS_MCP_INTSTAT);
 871
 872         /* check for reserved values read as zero */
 873         if (int_status & CDNS_MCP_INT_RESERVED)
 874                 return IRQ_NONE;
 875
 876         if (!(int_status & CDNS_MCP_INT_IRQ))
 877                 return IRQ_NONE;
 878
 879         if (int_status & CDNS_MCP_INT_RX_WL) {
 880                 struct sdw_bus *bus = &cdns->bus;
 881                 struct sdw_defer *defer = &bus->defer_msg;
 882
 883                 cdns_read_response(cdns);
 884
 885                 if (defer && defer->msg) {
 886                         cdns_fill_msg_resp(cdns, defer->msg,
 887                                            defer->length, 0);
 888                         complete(&defer->complete);
 889                 } else {
 890                         complete(&cdns->tx_complete);
 891                 }
 892         }
 893
 894         if (int_status & CDNS_MCP_INT_PARITY) {
 895                 /* Parity error detected by Master */
 896                 dev_err_ratelimited(cdns->dev, "Parity error\n");
 897         }
 898
 899         if (int_status & CDNS_MCP_INT_CTRL_CLASH) {
 900                 /* Slave is driving bit slot during control word */
 901                 dev_err_ratelimited(cdns->dev, "Bus clash for control word\n");
 902         }
 903
 904         if (int_status & CDNS_MCP_INT_DATA_CLASH) {
 905                 /*
 906                  * Multiple slaves trying to drive bit slot, or issue with
 907                  * ownership of data bits or Slave gone bonkers
 908                  */
 909                 dev_err_ratelimited(cdns->dev, "Bus clash for data word\n");
 910         }
 911
 912         if (cdns->bus.params.m_data_mode != SDW_PORT_DATA_MODE_NORMAL &&
 913             int_status & CDNS_MCP_INT_DPINT) {
 914                 u32 port_intstat;
 915
 916                 /* just log which ports report an error */
 917                 port_intstat = cdns_readl(cdns, CDNS_MCP_PORT_INTSTAT);
 918                 dev_err_ratelimited(cdns->dev, "DP interrupt: PortIntStat %8x\n",
 919                                     port_intstat);
 920
 921                 /* clear status w/ write1 */
 922                 cdns_writel(cdns, CDNS_MCP_PORT_INTSTAT, port_intstat);
 923         }
 924
 925         if (int_status & CDNS_MCP_INT_SLAVE_MASK) {
 926                 /* Mask the Slave interrupt and wake thread */
 927                 cdns_updatel(cdns, CDNS_MCP_INTMASK,
 928                              CDNS_MCP_INT_SLAVE_MASK, 0);
 929
 930                 int_status &= ~CDNS_MCP_INT_SLAVE_MASK;
 931
 932                 /*
 933                  * Deal with possible race condition between interrupt
 934                  * handling and disabling interrupts on suspend.
 935                  *
 936                  * If the master is in the process of disabling
 937                  * interrupts, don't schedule a workqueue
 938                  */
 939                 if (cdns->interrupt_enabled)
 940                         schedule_work(&cdns->work);
 941         }
 942
 943         cdns_writel(cdns, CDNS_MCP_INTSTAT, int_status);
 944         return IRQ_HANDLED;
 945 }
 946 EXPORT_SYMBOL(sdw_cdns_irq);
 947
 948 /**
 949  * cdns_update_slave_status_work - update slave status in a work since we will need to handle
 950  * other interrupts eg. CDNS_MCP_INT_RX_WL during the update slave
 951  * process.
 952  * @work: cdns worker thread
 953  */
 954 static void cdns_update_slave_status_work(struct work_struct *work)
 955 {
 956         struct sdw_cdns *cdns =
 957                 container_of(work, struct sdw_cdns, work);
 958         u32 slave0, slave1;
 959         u64 slave_intstat;
 960         u32 device0_status;
 961         int retry_count = 0;
 962
 963         /*
 964          * Clear main interrupt first so we don't lose any assertions
 965          * that happen during this function.
 966          */
 967         cdns_writel(cdns, CDNS_MCP_INTSTAT, CDNS_MCP_INT_SLAVE_MASK);
 968
 969         slave0 = cdns_readl(cdns, CDNS_MCP_SLAVE_INTSTAT0);
 970         slave1 = cdns_readl(cdns, CDNS_MCP_SLAVE_INTSTAT1);
 971
 972         /*
 973          * Clear the bits before handling so we don't lose any
 974          * bits that re-assert.
 975          */
 976         cdns_writel(cdns, CDNS_MCP_SLAVE_INTSTAT0, slave0);
 977         cdns_writel(cdns, CDNS_MCP_SLAVE_INTSTAT1, slave1);
 978
 979         /* combine the two status */
 980         slave_intstat = ((u64)slave1 << 32) | slave0;
 981
 982         dev_dbg_ratelimited(cdns->dev, "Slave status change: 0x%llx\n", slave_intstat);
 983
 984 update_status:
 985         cdns_update_slave_status(cdns, slave_intstat);
 986
 987         /*
 988          * When there is more than one peripheral per link, it's
 989          * possible that a deviceB becomes attached after we deal with
 990          * the attachment of deviceA. Since the hardware does a
 991          * logical AND, the attachment of the second device does not
 992          * change the status seen by the driver.
 993          *
 994          * In that case, clearing the registers above would result in
 995          * the deviceB never being detected - until a change of status
 996          * is observed on the bus.
 997          *
 998          * To avoid this race condition, re-check if any device0 needs
 999          * attention with PING commands. There is no need to check for
1000          * ALERTS since they are not allowed until a non-zero
1001          * device_number is assigned.
1002          *
1003          * Do not clear the INTSTAT0/1. While looping to enumerate devices on
1004          * #0 there could be status changes on other devices - these must
1005          * be kept in the INTSTAT so they can be handled when all #0 devices
1006          * have been handled.
1007          */
1008
1009         device0_status = cdns_readl(cdns, CDNS_MCP_SLAVE_STAT);
1010         device0_status &= 3;
1011
1012         if (device0_status == SDW_SLAVE_ATTACHED) {
1013                 if (retry_count++ < SDW_MAX_DEVICES) {
1014                         dev_dbg_ratelimited(cdns->dev,
1015                                             "Device0 detected after clearing status, iteration %d\n",
1016                                             retry_count);
1017                         slave_intstat = CDNS_MCP_SLAVE_INTSTAT_ATTACHED;
1018                         goto update_status;
1019                 } else {
1020                         dev_err_ratelimited(cdns->dev,
1021                                             "Device0 detected after %d iterations\n",
1022                                             retry_count);
1023                 }
1024         }
1025
1026         /* unmask Slave interrupt now */
1027         cdns_updatel(cdns, CDNS_MCP_INTMASK,
1028                      CDNS_MCP_INT_SLAVE_MASK, CDNS_MCP_INT_SLAVE_MASK);
1029
1030 }
1031
1032 /* paranoia check to make sure self-cleared bits are indeed cleared */
1033 void sdw_cdns_check_self_clearing_bits(struct sdw_cdns *cdns, const char *string,
1034                                        bool initial_delay, int reset_iterations)
1035 {
1036         u32 mcp_control;
1037         u32 mcp_config_update;
1038         int i;
1039
1040         if (initial_delay)
1041                 usleep_range(1000, 1500);
1042
1043         mcp_control = cdns_readl(cdns, CDNS_MCP_CONTROL);
1044
1045         /* the following bits should be cleared immediately */
1046         if (mcp_control & CDNS_MCP_CONTROL_CMD_RST)
1047                 dev_err(cdns->dev, "%s failed: MCP_CONTROL_CMD_RST is not cleared\n", string);
1048         if (mcp_control & CDNS_MCP_CONTROL_SOFT_RST)
1049                 dev_err(cdns->dev, "%s failed: MCP_CONTROL_SOFT_RST is not cleared\n", string);
1050         if (mcp_control & CDNS_MCP_CONTROL_SW_RST)
1051                 dev_err(cdns->dev, "%s failed: MCP_CONTROL_SW_RST is not cleared\n", string);
1052         if (mcp_control & CDNS_MCP_CONTROL_CLK_STOP_CLR)
1053                 dev_err(cdns->dev, "%s failed: MCP_CONTROL_CLK_STOP_CLR is not cleared\n", string);
1054         mcp_config_update = cdns_readl(cdns, CDNS_MCP_CONFIG_UPDATE);
1055         if (mcp_config_update & CDNS_MCP_CONFIG_UPDATE_BIT)
1056                 dev_err(cdns->dev, "%s failed: MCP_CONFIG_UPDATE_BIT is not cleared\n", string);
1057
1058         i = 0;
1059         while (mcp_control & CDNS_MCP_CONTROL_HW_RST) {
1060                 if (i == reset_iterations) {
1061                         dev_err(cdns->dev, "%s failed: MCP_CONTROL_HW_RST is not cleared\n", string);
1062                         break;
1063                 }
1064
1065                 dev_dbg(cdns->dev, "%s: MCP_CONTROL_HW_RST is not cleared at iteration %d\n", string, i);
1066                 i++;
1067
1068                 usleep_range(1000, 1500);
1069                 mcp_control = cdns_readl(cdns, CDNS_MCP_CONTROL);
1070         }
1071
1072 }
1073 EXPORT_SYMBOL(sdw_cdns_check_self_clearing_bits);
1074
1075 /*
1076  * init routines
1077  */
1078
1079 /**
1080  * sdw_cdns_exit_reset() - Program reset parameters and start bus operations
1081  * @cdns: Cadence instance
1082  */
1083 int sdw_cdns_exit_reset(struct sdw_cdns *cdns)
1084 {
1085         /* keep reset delay unchanged to 4096 cycles */
1086
1087         /* use hardware generated reset */
1088         cdns_updatel(cdns, CDNS_MCP_CONTROL,
1089                      CDNS_MCP_CONTROL_HW_RST,
1090                      CDNS_MCP_CONTROL_HW_RST);
1091
1092         /* commit changes */
1093         cdns_updatel(cdns, CDNS_MCP_CONFIG_UPDATE,
1094                      CDNS_MCP_CONFIG_UPDATE_BIT,
1095                      CDNS_MCP_CONFIG_UPDATE_BIT);
1096
1097         /* don't wait here */
1098         return 0;
1099
1100 }
1101 EXPORT_SYMBOL(sdw_cdns_exit_reset);
1102
1103 /**
1104  * cdns_enable_slave_interrupts() - Enable SDW slave interrupts
1105  * @cdns: Cadence instance
1106  * @state: boolean for true/false
1107  */
1108 static void cdns_enable_slave_interrupts(struct sdw_cdns *cdns, bool state)
1109 {
1110         u32 mask;
1111
1112         mask = cdns_readl(cdns, CDNS_MCP_INTMASK);
1113         if (state)
1114                 mask |= CDNS_MCP_INT_SLAVE_MASK;
1115         else
1116                 mask &= ~CDNS_MCP_INT_SLAVE_MASK;
1117
1118         cdns_writel(cdns, CDNS_MCP_INTMASK, mask);
1119 }
1120
1121 /**
1122  * sdw_cdns_enable_interrupt() - Enable SDW interrupts
1123  * @cdns: Cadence instance
1124  * @state: True if we are trying to enable interrupt.
1125  */
1126 int sdw_cdns_enable_interrupt(struct sdw_cdns *cdns, bool state)
1127 {
1128         u32 slave_intmask0 = 0;
1129         u32 slave_intmask1 = 0;
1130         u32 mask = 0;
1131
1132         if (!state)
1133                 goto update_masks;
1134
1135         slave_intmask0 = CDNS_MCP_SLAVE_INTMASK0_MASK;
1136         slave_intmask1 = CDNS_MCP_SLAVE_INTMASK1_MASK;
1137
1138         /* enable detection of all slave state changes */
1139         mask = CDNS_MCP_INT_SLAVE_MASK;
1140
1141         /* enable detection of bus issues */
1142         mask |= CDNS_MCP_INT_CTRL_CLASH | CDNS_MCP_INT_DATA_CLASH |
1143                 CDNS_MCP_INT_PARITY;
1144
1145         /* port interrupt limited to test modes for now */
1146         if (cdns->bus.params.m_data_mode != SDW_PORT_DATA_MODE_NORMAL)
1147                 mask |= CDNS_MCP_INT_DPINT;
1148
1149         /* enable detection of RX fifo level */
1150         mask |= CDNS_MCP_INT_RX_WL;
1151
1152         /*
1153          * CDNS_MCP_INT_IRQ needs to be set otherwise all previous
1154          * settings are irrelevant
1155          */
1156         mask |= CDNS_MCP_INT_IRQ;
1157
1158         if (interrupt_mask) /* parameter override */
1159                 mask = interrupt_mask;
1160
1161 update_masks:
1162         /* clear slave interrupt status before enabling interrupt */
1163         if (state) {
1164                 u32 slave_state;
1165
1166                 slave_state = cdns_readl(cdns, CDNS_MCP_SLAVE_INTSTAT0);
1167                 cdns_writel(cdns, CDNS_MCP_SLAVE_INTSTAT0, slave_state);
1168                 slave_state = cdns_readl(cdns, CDNS_MCP_SLAVE_INTSTAT1);
1169                 cdns_writel(cdns, CDNS_MCP_SLAVE_INTSTAT1, slave_state);
1170         }
1171         cdns->interrupt_enabled = state;
1172
1173         /*
1174          * Complete any on-going status updates before updating masks,
1175          * and cancel queued status updates.
1176          *
1177          * There could be a race with a new interrupt thrown before
1178          * the 3 mask updates below are complete, so in the interrupt
1179          * we use the 'interrupt_enabled' status to prevent new work
1180          * from being queued.
1181          */
1182         if (!state)
1183                 cancel_work_sync(&cdns->work);
1184
1185         cdns_writel(cdns, CDNS_MCP_SLAVE_INTMASK0, slave_intmask0);
1186         cdns_writel(cdns, CDNS_MCP_SLAVE_INTMASK1, slave_intmask1);
1187         cdns_writel(cdns, CDNS_MCP_INTMASK, mask);
1188
1189         return 0;
1190 }
1191 EXPORT_SYMBOL(sdw_cdns_enable_interrupt);
1192
1193 static int cdns_allocate_pdi(struct sdw_cdns *cdns,
1194                              struct sdw_cdns_pdi **stream,
1195                              u32 num, u32 pdi_offset)
1196 {
1197         struct sdw_cdns_pdi *pdi;
1198         int i;
1199
1200         if (!num)
1201                 return 0;
1202
1203         pdi = devm_kcalloc(cdns->dev, num, sizeof(*pdi), GFP_KERNEL);
1204         if (!pdi)
1205                 return -ENOMEM;
1206
1207         for (i = 0; i < num; i++) {
1208                 pdi[i].num = i + pdi_offset;
1209         }
1210
1211         *stream = pdi;
1212         return 0;
1213 }
1214
1215 /**
1216  * sdw_cdns_pdi_init() - PDI initialization routine
1217  *
1218  * @cdns: Cadence instance
1219  * @config: Stream configurations
1220  */
1221 int sdw_cdns_pdi_init(struct sdw_cdns *cdns,
1222                       struct sdw_cdns_stream_config config)
1223 {
1224         struct sdw_cdns_streams *stream;
1225         int offset;
1226         int ret;
1227
1228         cdns->pcm.num_bd = config.pcm_bd;
1229         cdns->pcm.num_in = config.pcm_in;
1230         cdns->pcm.num_out = config.pcm_out;
1231
1232         /* Allocate PDIs for PCMs */
1233         stream = &cdns->pcm;
1234
1235         /* we allocate PDI0 and PDI1 which are used for Bulk */
1236         offset = 0;
1237
1238         ret = cdns_allocate_pdi(cdns, &stream->bd,
1239                                 stream->num_bd, offset);
1240         if (ret)
1241                 return ret;
1242
1243         offset += stream->num_bd;
1244
1245         ret = cdns_allocate_pdi(cdns, &stream->in,
1246                                 stream->num_in, offset);
1247         if (ret)
1248                 return ret;
1249
1250         offset += stream->num_in;
1251
1252         ret = cdns_allocate_pdi(cdns, &stream->out,
1253                                 stream->num_out, offset);
1254         if (ret)
1255                 return ret;
1256
1257         /* Update total number of PCM PDIs */
1258         stream->num_pdi = stream->num_bd + stream->num_in + stream->num_out;
1259         cdns->num_ports = stream->num_pdi;
1260
1261         return 0;
1262 }
1263 EXPORT_SYMBOL(sdw_cdns_pdi_init);
1264
1265 static u32 cdns_set_initial_frame_shape(int n_rows, int n_cols)
1266 {
1267         u32 val;
1268         int c;
1269         int r;
1270
1271         r = sdw_find_row_index(n_rows);
1272         c = sdw_find_col_index(n_cols);
1273
1274         val = FIELD_PREP(CDNS_MCP_FRAME_SHAPE_ROW_MASK, r);
1275         val |= FIELD_PREP(CDNS_MCP_FRAME_SHAPE_COL_MASK, c);
1276
1277         return val;
1278 }
1279
1280 static void cdns_init_clock_ctrl(struct sdw_cdns *cdns)
1281 {
1282         struct sdw_bus *bus = &cdns->bus;
1283         struct sdw_master_prop *prop = &bus->prop;
1284         u32 val;
1285         u32 ssp_interval;
1286         int divider;
1287
1288         /* Set clock divider */
1289         divider = (prop->mclk_freq / prop->max_clk_freq) - 1;
1290
1291         cdns_updatel(cdns, CDNS_MCP_CLK_CTRL0,
1292                      CDNS_MCP_CLK_MCLKD_MASK, divider);
1293         cdns_updatel(cdns, CDNS_MCP_CLK_CTRL1,
1294                      CDNS_MCP_CLK_MCLKD_MASK, divider);
1295
1296         /*
1297          * Frame shape changes after initialization have to be done
1298          * with the bank switch mechanism
1299          */
1300         val = cdns_set_initial_frame_shape(prop->default_row,
1301                                            prop->default_col);
1302         cdns_writel(cdns, CDNS_MCP_FRAME_SHAPE_INIT, val);
1303
1304         /* Set SSP interval to default value */
1305         ssp_interval = prop->default_frame_rate / SDW_CADENCE_GSYNC_HZ;
1306         cdns_writel(cdns, CDNS_MCP_SSP_CTRL0, ssp_interval);
1307         cdns_writel(cdns, CDNS_MCP_SSP_CTRL1, ssp_interval);
1308 }
1309
1310 /**
1311  * sdw_cdns_init() - Cadence initialization
1312  * @cdns: Cadence instance
1313  */
1314 int sdw_cdns_init(struct sdw_cdns *cdns)
1315 {
1316         u32 val;
1317
1318         cdns_init_clock_ctrl(cdns);
1319
1320         sdw_cdns_check_self_clearing_bits(cdns, __func__, false, 0);
1321
1322         /* reset msg_count to default value of FIFOLEVEL */
1323         cdns->msg_count = cdns_readl(cdns, CDNS_MCP_FIFOLEVEL);
1324
1325         /* flush command FIFOs */
1326         cdns_updatel(cdns, CDNS_MCP_CONTROL, CDNS_MCP_CONTROL_CMD_RST,
1327                      CDNS_MCP_CONTROL_CMD_RST);
1328
1329         /* Set cmd accept mode */
1330         cdns_updatel(cdns, CDNS_MCP_CONTROL, CDNS_MCP_CONTROL_CMD_ACCEPT,
1331                      CDNS_MCP_CONTROL_CMD_ACCEPT);
1332
1333         /* Configure mcp config */
1334         val = cdns_readl(cdns, CDNS_MCP_CONFIG);
1335
1336         /* enable bus operations with clock and data */
1337         val &= ~CDNS_MCP_CONFIG_OP;
1338         val |= CDNS_MCP_CONFIG_OP_NORMAL;
1339
1340         /* Set cmd mode for Tx and Rx cmds */
1341         val &= ~CDNS_MCP_CONFIG_CMD;
1342
1343         /* Disable sniffer mode */
1344         val &= ~CDNS_MCP_CONFIG_SNIFFER;
1345
1346         /* Disable auto bus release */
1347         val &= ~CDNS_MCP_CONFIG_BUS_REL;
1348
1349         if (cdns->bus.multi_link)
1350                 /* Set Multi-master mode to take gsync into account */
1351                 val |= CDNS_MCP_CONFIG_MMASTER;
1352
1353         /* leave frame delay to hardware default of 0x1F */
1354
1355         /* leave command retry to hardware default of 0 */
1356
1357         cdns_writel(cdns, CDNS_MCP_CONFIG, val);
1358
1359         /* changes will be committed later */
1360         return 0;
1361 }
1362 EXPORT_SYMBOL(sdw_cdns_init);
1363
1364 int cdns_bus_conf(struct sdw_bus *bus, struct sdw_bus_params *params)
1365 {
1366         struct sdw_master_prop *prop = &bus->prop;
1367         struct sdw_cdns *cdns = bus_to_cdns(bus);
1368         int mcp_clkctrl_off;
1369         int divider;
1370
1371         if (!params->curr_dr_freq) {
1372                 dev_err(cdns->dev, "NULL curr_dr_freq\n");
1373                 return -EINVAL;
1374         }
1375
1376         divider = prop->mclk_freq * SDW_DOUBLE_RATE_FACTOR /
1377                 params->curr_dr_freq;
1378         divider--; /* divider is 1/(N+1) */
1379
1380         if (params->next_bank)
1381                 mcp_clkctrl_off = CDNS_MCP_CLK_CTRL1;
1382         else
1383                 mcp_clkctrl_off = CDNS_MCP_CLK_CTRL0;
1384
1385         cdns_updatel(cdns, mcp_clkctrl_off, CDNS_MCP_CLK_MCLKD_MASK, divider);
1386
1387         return 0;
1388 }
1389 EXPORT_SYMBOL(cdns_bus_conf);
1390
1391 static int cdns_port_params(struct sdw_bus *bus,
1392                             struct sdw_port_params *p_params, unsigned int bank)
1393 {
1394         struct sdw_cdns *cdns = bus_to_cdns(bus);
1395         int dpn_config_off_source;
1396         int dpn_config_off_target;
1397         int target_num = p_params->num;
1398         int source_num = p_params->num;
1399         bool override = false;
1400         int dpn_config;
1401
1402         if (target_num == cdns->pdi_loopback_target &&
1403             cdns->pdi_loopback_source != -1) {
1404                 source_num = cdns->pdi_loopback_source;
1405                 override = true;
1406         }
1407
1408         if (bank) {
1409                 dpn_config_off_source = CDNS_DPN_B1_CONFIG(source_num);
1410                 dpn_config_off_target = CDNS_DPN_B1_CONFIG(target_num);
1411         } else {
1412                 dpn_config_off_source = CDNS_DPN_B0_CONFIG(source_num);
1413                 dpn_config_off_target = CDNS_DPN_B0_CONFIG(target_num);
1414         }
1415
1416         dpn_config = cdns_readl(cdns, dpn_config_off_source);
1417
1418         /* use port params if there is no loopback, otherwise use source as is */
1419         if (!override) {
1420                 u32p_replace_bits(&dpn_config, p_params->bps - 1, CDNS_DPN_CONFIG_WL);
1421                 u32p_replace_bits(&dpn_config, p_params->flow_mode, CDNS_DPN_CONFIG_PORT_FLOW);
1422                 u32p_replace_bits(&dpn_config, p_params->data_mode, CDNS_DPN_CONFIG_PORT_DAT);
1423         }
1424
1425         cdns_writel(cdns, dpn_config_off_target, dpn_config);
1426
1427         return 0;
1428 }
1429
1430 static int cdns_transport_params(struct sdw_bus *bus,
1431                                  struct sdw_transport_params *t_params,
1432                                  enum sdw_reg_bank bank)
1433 {
1434         struct sdw_cdns *cdns = bus_to_cdns(bus);
1435         int dpn_config;
1436         int dpn_config_off_source;
1437         int dpn_config_off_target;
1438         int dpn_hctrl;
1439         int dpn_hctrl_off_source;
1440         int dpn_hctrl_off_target;
1441         int dpn_offsetctrl;
1442         int dpn_offsetctrl_off_source;
1443         int dpn_offsetctrl_off_target;
1444         int dpn_samplectrl;
1445         int dpn_samplectrl_off_source;
1446         int dpn_samplectrl_off_target;
1447         int source_num = t_params->port_num;
1448         int target_num = t_params->port_num;
1449         bool override = false;
1450
1451         if (target_num == cdns->pdi_loopback_target &&
1452             cdns->pdi_loopback_source != -1) {
1453                 source_num = cdns->pdi_loopback_source;
1454                 override = true;
1455         }
1456
1457         /*
1458          * Note: Only full data port is supported on the Master side for
1459          * both PCM and PDM ports.
1460          */
1461
1462         if (bank) {
1463                 dpn_config_off_source = CDNS_DPN_B1_CONFIG(source_num);
1464                 dpn_hctrl_off_source = CDNS_DPN_B1_HCTRL(source_num);
1465                 dpn_offsetctrl_off_source = CDNS_DPN_B1_OFFSET_CTRL(source_num);
1466                 dpn_samplectrl_off_source = CDNS_DPN_B1_SAMPLE_CTRL(source_num);
1467
1468                 dpn_config_off_target = CDNS_DPN_B1_CONFIG(target_num);
1469                 dpn_hctrl_off_target = CDNS_DPN_B1_HCTRL(target_num);
1470                 dpn_offsetctrl_off_target = CDNS_DPN_B1_OFFSET_CTRL(target_num);
1471                 dpn_samplectrl_off_target = CDNS_DPN_B1_SAMPLE_CTRL(target_num);
1472
1473         } else {
1474                 dpn_config_off_source = CDNS_DPN_B0_CONFIG(source_num);
1475                 dpn_hctrl_off_source = CDNS_DPN_B0_HCTRL(source_num);
1476                 dpn_offsetctrl_off_source = CDNS_DPN_B0_OFFSET_CTRL(source_num);
1477                 dpn_samplectrl_off_source = CDNS_DPN_B0_SAMPLE_CTRL(source_num);
1478
1479                 dpn_config_off_target = CDNS_DPN_B0_CONFIG(target_num);
1480                 dpn_hctrl_off_target = CDNS_DPN_B0_HCTRL(target_num);
1481                 dpn_offsetctrl_off_target = CDNS_DPN_B0_OFFSET_CTRL(target_num);
1482                 dpn_samplectrl_off_target = CDNS_DPN_B0_SAMPLE_CTRL(target_num);
1483         }
1484
1485         dpn_config = cdns_readl(cdns, dpn_config_off_source);
1486         if (!override) {
1487                 u32p_replace_bits(&dpn_config, t_params->blk_grp_ctrl, CDNS_DPN_CONFIG_BGC);
1488                 u32p_replace_bits(&dpn_config, t_params->blk_pkg_mode, CDNS_DPN_CONFIG_BPM);
1489         }
1490         cdns_writel(cdns, dpn_config_off_target, dpn_config);
1491
1492         if (!override) {
1493                 dpn_offsetctrl = 0;
1494                 u32p_replace_bits(&dpn_offsetctrl, t_params->offset1, CDNS_DPN_OFFSET_CTRL_1);
1495                 u32p_replace_bits(&dpn_offsetctrl, t_params->offset2, CDNS_DPN_OFFSET_CTRL_2);
1496         } else {
1497                 dpn_offsetctrl = cdns_readl(cdns, dpn_offsetctrl_off_source);
1498         }
1499         cdns_writel(cdns, dpn_offsetctrl_off_target,  dpn_offsetctrl);
1500
1501         if (!override) {
1502                 dpn_hctrl = 0;
1503                 u32p_replace_bits(&dpn_hctrl, t_params->hstart, CDNS_DPN_HCTRL_HSTART);
1504                 u32p_replace_bits(&dpn_hctrl, t_params->hstop, CDNS_DPN_HCTRL_HSTOP);
1505                 u32p_replace_bits(&dpn_hctrl, t_params->lane_ctrl, CDNS_DPN_HCTRL_LCTRL);
1506         } else {
1507                 dpn_hctrl = cdns_readl(cdns, dpn_hctrl_off_source);
1508         }
1509         cdns_writel(cdns, dpn_hctrl_off_target, dpn_hctrl);
1510
1511         if (!override)
1512                 dpn_samplectrl = t_params->sample_interval - 1;
1513         else
1514                 dpn_samplectrl = cdns_readl(cdns, dpn_samplectrl_off_source);
1515         cdns_writel(cdns, dpn_samplectrl_off_target, dpn_samplectrl);
1516
1517         return 0;
1518 }
1519
1520 static int cdns_port_enable(struct sdw_bus *bus,
1521                             struct sdw_enable_ch *enable_ch, unsigned int bank)
1522 {
1523         struct sdw_cdns *cdns = bus_to_cdns(bus);
1524         int dpn_chnen_off, ch_mask;
1525
1526         if (bank)
1527                 dpn_chnen_off = CDNS_DPN_B1_CH_EN(enable_ch->port_num);
1528         else
1529                 dpn_chnen_off = CDNS_DPN_B0_CH_EN(enable_ch->port_num);
1530
1531         ch_mask = enable_ch->ch_mask * enable_ch->enable;
1532         cdns_writel(cdns, dpn_chnen_off, ch_mask);
1533
1534         return 0;
1535 }
1536
1537 static const struct sdw_master_port_ops cdns_port_ops = {
1538         .dpn_set_port_params = cdns_port_params,
1539         .dpn_set_port_transport_params = cdns_transport_params,
1540         .dpn_port_enable_ch = cdns_port_enable,
1541 };
1542
1543 /**
1544  * sdw_cdns_is_clock_stop: Check clock status
1545  *
1546  * @cdns: Cadence instance
1547  */
1548 bool sdw_cdns_is_clock_stop(struct sdw_cdns *cdns)
1549 {
1550         return !!(cdns_readl(cdns, CDNS_MCP_STAT) & CDNS_MCP_STAT_CLK_STOP);
1551 }
1552 EXPORT_SYMBOL(sdw_cdns_is_clock_stop);
1553
1554 /**
1555  * sdw_cdns_clock_stop: Cadence clock stop configuration routine
1556  *
1557  * @cdns: Cadence instance
1558  * @block_wake: prevent wakes if required by the platform
1559  */
1560 int sdw_cdns_clock_stop(struct sdw_cdns *cdns, bool block_wake)
1561 {
1562         bool slave_present = false;
1563         struct sdw_slave *slave;
1564         int ret;
1565
1566         sdw_cdns_check_self_clearing_bits(cdns, __func__, false, 0);
1567
1568         /* Check suspend status */
1569         if (sdw_cdns_is_clock_stop(cdns)) {
1570                 dev_dbg(cdns->dev, "Clock is already stopped\n");
1571                 return 0;
1572         }
1573
1574         /*
1575          * Before entering clock stop we mask the Slave
1576          * interrupts. This helps avoid having to deal with e.g. a
1577          * Slave becoming UNATTACHED while the clock is being stopped
1578          */
1579         cdns_enable_slave_interrupts(cdns, false);
1580
1581         /*
1582          * For specific platforms, it is required to be able to put
1583          * master into a state in which it ignores wake-up trials
1584          * in clock stop state
1585          */
1586         if (block_wake)
1587                 cdns_updatel(cdns, CDNS_MCP_CONTROL,
1588                              CDNS_MCP_CONTROL_BLOCK_WAKEUP,
1589                              CDNS_MCP_CONTROL_BLOCK_WAKEUP);
1590
1591         list_for_each_entry(slave, &cdns->bus.slaves, node) {
1592                 if (slave->status == SDW_SLAVE_ATTACHED ||
1593                     slave->status == SDW_SLAVE_ALERT) {
1594                         slave_present = true;
1595                         break;
1596                 }
1597         }
1598
1599         /* commit changes */
1600         ret = cdns_config_update(cdns);
1601         if (ret < 0) {
1602                 dev_err(cdns->dev, "%s: config_update failed\n", __func__);
1603                 return ret;
1604         }
1605
1606         /* Prepare slaves for clock stop */
1607         if (slave_present) {
1608                 ret = sdw_bus_prep_clk_stop(&cdns->bus);
1609                 if (ret < 0 && ret != -ENODATA) {
1610                         dev_err(cdns->dev, "prepare clock stop failed %d\n", ret);
1611                         return ret;
1612                 }
1613         }
1614
1615         /*
1616          * Enter clock stop mode and only report errors if there are
1617          * Slave devices present (ALERT or ATTACHED)
1618          */
1619         ret = sdw_bus_clk_stop(&cdns->bus);
1620         if (ret < 0 && slave_present && ret != -ENODATA) {
1621                 dev_err(cdns->dev, "bus clock stop failed %d\n", ret);
1622                 return ret;
1623         }
1624
1625         ret = cdns_set_wait(cdns, CDNS_MCP_STAT,
1626                             CDNS_MCP_STAT_CLK_STOP,
1627                             CDNS_MCP_STAT_CLK_STOP);
1628         if (ret < 0)
1629                 dev_err(cdns->dev, "Clock stop failed %d\n", ret);
1630
1631         return ret;
1632 }
1633 EXPORT_SYMBOL(sdw_cdns_clock_stop);
1634
1635 /**
1636  * sdw_cdns_clock_restart: Cadence PM clock restart configuration routine
1637  *
1638  * @cdns: Cadence instance
1639  * @bus_reset: context may be lost while in low power modes and the bus
1640  * may require a Severe Reset and re-enumeration after a wake.
1641  */
1642 int sdw_cdns_clock_restart(struct sdw_cdns *cdns, bool bus_reset)
1643 {
1644         int ret;
1645
1646         /* unmask Slave interrupts that were masked when stopping the clock */
1647         cdns_enable_slave_interrupts(cdns, true);
1648
1649         ret = cdns_clear_bit(cdns, CDNS_MCP_CONTROL,
1650                              CDNS_MCP_CONTROL_CLK_STOP_CLR);
1651         if (ret < 0) {
1652                 dev_err(cdns->dev, "Couldn't exit from clock stop\n");
1653                 return ret;
1654         }
1655
1656         ret = cdns_set_wait(cdns, CDNS_MCP_STAT, CDNS_MCP_STAT_CLK_STOP, 0);
1657         if (ret < 0) {
1658                 dev_err(cdns->dev, "clock stop exit failed %d\n", ret);
1659                 return ret;
1660         }
1661
1662         cdns_updatel(cdns, CDNS_MCP_CONTROL,
1663                      CDNS_MCP_CONTROL_BLOCK_WAKEUP, 0);
1664
1665         cdns_updatel(cdns, CDNS_MCP_CONTROL, CDNS_MCP_CONTROL_CMD_ACCEPT,
1666                      CDNS_MCP_CONTROL_CMD_ACCEPT);
1667
1668         if (!bus_reset) {
1669
1670                 /* enable bus operations with clock and data */
1671                 cdns_updatel(cdns, CDNS_MCP_CONFIG,
1672                              CDNS_MCP_CONFIG_OP,
1673                              CDNS_MCP_CONFIG_OP_NORMAL);
1674
1675                 ret = cdns_config_update(cdns);
1676                 if (ret < 0) {
1677                         dev_err(cdns->dev, "%s: config_update failed\n", __func__);
1678                         return ret;
1679                 }
1680
1681                 ret = sdw_bus_exit_clk_stop(&cdns->bus);
1682                 if (ret < 0)
1683                         dev_err(cdns->dev, "bus failed to exit clock stop %d\n", ret);
1684         }
1685
1686         return ret;
1687 }
1688 EXPORT_SYMBOL(sdw_cdns_clock_restart);
1689
1690 /**
1691  * sdw_cdns_probe() - Cadence probe routine
1692  * @cdns: Cadence instance
1693  */
1694 int sdw_cdns_probe(struct sdw_cdns *cdns)
1695 {
1696         init_completion(&cdns->tx_complete);
1697         cdns->bus.port_ops = &cdns_port_ops;
1698
1699         INIT_WORK(&cdns->work, cdns_update_slave_status_work);
1700         return 0;
1701 }
1702 EXPORT_SYMBOL(sdw_cdns_probe);
1703
1704 int cdns_set_sdw_stream(struct snd_soc_dai *dai,
1705                         void *stream, int direction)
1706 {
1707         struct sdw_cdns *cdns = snd_soc_dai_get_drvdata(dai);
1708         struct sdw_cdns_dai_runtime *dai_runtime;
1709
1710         dai_runtime = cdns->dai_runtime_array[dai->id];
1711
1712         if (stream) {
1713                 /* first paranoia check */
1714                 if (dai_runtime) {
1715                         dev_err(dai->dev,
1716                                 "dai_runtime already allocated for dai %s\n",
1717                                 dai->name);
1718                         return -EINVAL;
1719                 }
1720
1721                 /* allocate and set dai_runtime info */
1722                 dai_runtime = kzalloc(sizeof(*dai_runtime), GFP_KERNEL);
1723                 if (!dai_runtime)
1724                         return -ENOMEM;
1725
1726                 dai_runtime->stream_type = SDW_STREAM_PCM;
1727
1728                 dai_runtime->bus = &cdns->bus;
1729                 dai_runtime->link_id = cdns->instance;
1730
1731                 dai_runtime->stream = stream;
1732                 dai_runtime->direction = direction;
1733
1734                 cdns->dai_runtime_array[dai->id] = dai_runtime;
1735         } else {
1736                 /* second paranoia check */
1737                 if (!dai_runtime) {
1738                         dev_err(dai->dev,
1739                                 "dai_runtime not allocated for dai %s\n",
1740                                 dai->name);
1741                         return -EINVAL;
1742                 }
1743
1744                 /* for NULL stream we release allocated dai_runtime */
1745                 kfree(dai_runtime);
1746                 cdns->dai_runtime_array[dai->id] = NULL;
1747         }
1748         return 0;
1749 }
1750 EXPORT_SYMBOL(cdns_set_sdw_stream);
1751
1752 /**
1753  * cdns_find_pdi() - Find a free PDI
1754  *
1755  * @cdns: Cadence instance
1756  * @offset: Starting offset
1757  * @num: Number of PDIs
1758  * @pdi: PDI instances
1759  * @dai_id: DAI id
1760  *
1761  * Find a PDI for a given PDI array. The PDI num and dai_id are
1762  * expected to match, return NULL otherwise.
1763  */
1764 static struct sdw_cdns_pdi *cdns_find_pdi(struct sdw_cdns *cdns,
1765                                           unsigned int offset,
1766                                           unsigned int num,
1767                                           struct sdw_cdns_pdi *pdi,
1768                                           int dai_id)
1769 {
1770         int i;
1771
1772         for (i = offset; i < offset + num; i++)
1773                 if (pdi[i].num == dai_id)
1774                         return &pdi[i];
1775
1776         return NULL;
1777 }
1778
1779 /**
1780  * sdw_cdns_config_stream: Configure a stream
1781  *
1782  * @cdns: Cadence instance
1783  * @ch: Channel count
1784  * @dir: Data direction
1785  * @pdi: PDI to be used
1786  */
1787 void sdw_cdns_config_stream(struct sdw_cdns *cdns,
1788                             u32 ch, u32 dir, struct sdw_cdns_pdi *pdi)
1789 {
1790         u32 offset, val = 0;
1791
1792         if (dir == SDW_DATA_DIR_RX) {
1793                 val = CDNS_PORTCTRL_DIRN;
1794
1795                 if (cdns->bus.params.m_data_mode != SDW_PORT_DATA_MODE_NORMAL)
1796                         val |= CDNS_PORTCTRL_TEST_FAILED;
1797         }
1798         offset = CDNS_PORTCTRL + pdi->num * CDNS_PORT_OFFSET;
1799         cdns_updatel(cdns, offset,
1800                      CDNS_PORTCTRL_DIRN | CDNS_PORTCTRL_TEST_FAILED,
1801                      val);
1802
1803         val = pdi->num;
1804         val |= CDNS_PDI_CONFIG_SOFT_RESET;
1805         val |= FIELD_PREP(CDNS_PDI_CONFIG_CHANNEL, (1 << ch) - 1);
1806         cdns_writel(cdns, CDNS_PDI_CONFIG(pdi->num), val);
1807 }
1808 EXPORT_SYMBOL(sdw_cdns_config_stream);
1809
1810 /**
1811  * sdw_cdns_alloc_pdi() - Allocate a PDI
1812  *
1813  * @cdns: Cadence instance
1814  * @stream: Stream to be allocated
1815  * @ch: Channel count
1816  * @dir: Data direction
1817  * @dai_id: DAI id
1818  */
1819 struct sdw_cdns_pdi *sdw_cdns_alloc_pdi(struct sdw_cdns *cdns,
1820                                         struct sdw_cdns_streams *stream,
1821                                         u32 ch, u32 dir, int dai_id)
1822 {
1823         struct sdw_cdns_pdi *pdi = NULL;
1824
1825         if (dir == SDW_DATA_DIR_RX)
1826                 pdi = cdns_find_pdi(cdns, 0, stream->num_in, stream->in,
1827                                     dai_id);
1828         else
1829                 pdi = cdns_find_pdi(cdns, 0, stream->num_out, stream->out,
1830                                     dai_id);
1831
1832         /* check if we found a PDI, else find in bi-directional */
1833         if (!pdi)
1834                 pdi = cdns_find_pdi(cdns, 2, stream->num_bd, stream->bd,
1835                                     dai_id);
1836
1837         if (pdi) {
1838                 pdi->l_ch_num = 0;
1839                 pdi->h_ch_num = ch - 1;
1840                 pdi->dir = dir;
1841                 pdi->ch_count = ch;
1842         }
1843
1844         return pdi;
1845 }
1846 EXPORT_SYMBOL(sdw_cdns_alloc_pdi);
1847
1848 MODULE_LICENSE("Dual BSD/GPL");
1849 MODULE_DESCRIPTION("Cadence Soundwire Library");