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_resume_and_get(bus->dev);
 390         if (ret < 0 && ret != -EACCES) {
 391                 dev_err_ratelimited(cdns->dev,
 392                                     "pm_runtime_resume_and_get failed in %s, ret %d\n",
 393                                     __func__, ret);
 394                 return ret;
 395         }
 396
 397         /*
 398          * wait long enough for Slave(s) to be in steady state. This
 399          * does not need to be super precise.
 400          */
 401         msleep(200);
 402
 403         /*
 404          * Take the bus lock here to make sure that any bus transactions
 405          * will be queued while we inject a parity error on a dummy read
 406          */
 407         mutex_lock(&bus->bus_lock);
 408
 409         /* program hardware to inject parity error */
 410         cdns_updatel(cdns, CDNS_MCP_CMDCTRL,
 411                      CDNS_MCP_CMDCTRL_INSERT_PARITY_ERR,
 412                      CDNS_MCP_CMDCTRL_INSERT_PARITY_ERR);
 413
 414         /* commit changes */
 415         cdns_updatel(cdns, CDNS_MCP_CONFIG_UPDATE,
 416                      CDNS_MCP_CONFIG_UPDATE_BIT,
 417                      CDNS_MCP_CONFIG_UPDATE_BIT);
 418
 419         /* do a broadcast dummy read to avoid bus clashes */
 420         ret = sdw_bread_no_pm_unlocked(&cdns->bus, 0xf, SDW_SCP_DEVID_0);
 421         dev_info(cdns->dev, "parity error injection, read: %d\n", ret);
 422
 423         /* program hardware to disable parity error */
 424         cdns_updatel(cdns, CDNS_MCP_CMDCTRL,
 425                      CDNS_MCP_CMDCTRL_INSERT_PARITY_ERR,
 426                      0);
 427
 428         /* commit changes */
 429         cdns_updatel(cdns, CDNS_MCP_CONFIG_UPDATE,
 430                      CDNS_MCP_CONFIG_UPDATE_BIT,
 431                      CDNS_MCP_CONFIG_UPDATE_BIT);
 432
 433         /* Continue bus operation with parity error injection disabled */
 434         mutex_unlock(&bus->bus_lock);
 435
 436         /* Userspace changed the hardware state behind the kernel's back */
 437         add_taint(TAINT_USER, LOCKDEP_STILL_OK);
 438
 439         /*
 440          * allow Master device to enter pm_runtime suspend. This may
 441          * also result in Slave devices suspending.
 442          */
 443         pm_runtime_mark_last_busy(bus->dev);
 444         pm_runtime_put_autosuspend(bus->dev);
 445
 446         return 0;
 447 }
 448
 449 DEFINE_DEBUGFS_ATTRIBUTE(cdns_parity_error_fops, NULL,
 450                          cdns_parity_error_injection, "%llu\n");
 451
 452 static int cdns_set_pdi_loopback_source(void *data, u64 value)
 453 {
 454         struct sdw_cdns *cdns = data;
 455         unsigned int pdi_out_num = cdns->pcm.num_bd + cdns->pcm.num_out;
 456
 457         if (value > pdi_out_num)
 458                 return -EINVAL;
 459
 460         /* Userspace changed the hardware state behind the kernel's back */
 461         add_taint(TAINT_USER, LOCKDEP_STILL_OK);
 462
 463         cdns->pdi_loopback_source = value;
 464
 465         return 0;
 466 }
 467 DEFINE_DEBUGFS_ATTRIBUTE(cdns_pdi_loopback_source_fops, NULL, cdns_set_pdi_loopback_source, "%llu\n");
 468
 469 static int cdns_set_pdi_loopback_target(void *data, u64 value)
 470 {
 471         struct sdw_cdns *cdns = data;
 472         unsigned int pdi_in_num = cdns->pcm.num_bd + cdns->pcm.num_in;
 473
 474         if (value > pdi_in_num)
 475                 return -EINVAL;
 476
 477         /* Userspace changed the hardware state behind the kernel's back */
 478         add_taint(TAINT_USER, LOCKDEP_STILL_OK);
 479
 480         cdns->pdi_loopback_target = value;
 481
 482         return 0;
 483 }
 484 DEFINE_DEBUGFS_ATTRIBUTE(cdns_pdi_loopback_target_fops, NULL, cdns_set_pdi_loopback_target, "%llu\n");
 485
 486 /**
 487  * sdw_cdns_debugfs_init() - Cadence debugfs init
 488  * @cdns: Cadence instance
 489  * @root: debugfs root
 490  */
 491 void sdw_cdns_debugfs_init(struct sdw_cdns *cdns, struct dentry *root)
 492 {
 493         debugfs_create_file("cdns-registers", 0400, root, cdns, &cdns_reg_fops);
 494
 495         debugfs_create_file("cdns-hw-reset", 0200, root, cdns,
 496                             &cdns_hw_reset_fops);
 497
 498         debugfs_create_file("cdns-parity-error-injection", 0200, root, cdns,
 499                             &cdns_parity_error_fops);
 500
 501         cdns->pdi_loopback_source = -1;
 502         cdns->pdi_loopback_target = -1;
 503
 504         debugfs_create_file("cdns-pdi-loopback-source", 0200, root, cdns,
 505                             &cdns_pdi_loopback_source_fops);
 506
 507         debugfs_create_file("cdns-pdi-loopback-target", 0200, root, cdns,
 508                             &cdns_pdi_loopback_target_fops);
 509
 510 }
 511 EXPORT_SYMBOL_GPL(sdw_cdns_debugfs_init);
 512
 513 #endif /* CONFIG_DEBUG_FS */
 514
 515 /*
 516  * IO Calls
 517  */
 518 static enum sdw_command_response
 519 cdns_fill_msg_resp(struct sdw_cdns *cdns,
 520                    struct sdw_msg *msg, int count, int offset)
 521 {
 522         int nack = 0, no_ack = 0;
 523         int i;
 524
 525         /* check message response */
 526         for (i = 0; i < count; i++) {
 527                 if (!(cdns->response_buf[i] & CDNS_MCP_RESP_ACK)) {
 528                         no_ack = 1;
 529                         dev_vdbg(cdns->dev, "Msg Ack not received, cmd %d\n", i);
 530                 }
 531                 if (cdns->response_buf[i] & CDNS_MCP_RESP_NACK) {
 532                         nack = 1;
 533                         dev_err_ratelimited(cdns->dev, "Msg NACK received, cmd %d\n", i);
 534                 }
 535         }
 536
 537         if (nack) {
 538                 dev_err_ratelimited(cdns->dev, "Msg NACKed for Slave %d\n", msg->dev_num);
 539                 return SDW_CMD_FAIL;
 540         }
 541
 542         if (no_ack) {
 543                 dev_dbg_ratelimited(cdns->dev, "Msg ignored for Slave %d\n", msg->dev_num);
 544                 return SDW_CMD_IGNORED;
 545         }
 546
 547         if (msg->flags == SDW_MSG_FLAG_READ) {
 548                 /* fill response */
 549                 for (i = 0; i < count; i++)
 550                         msg->buf[i + offset] = FIELD_GET(CDNS_MCP_RESP_RDATA,
 551                                                          cdns->response_buf[i]);
 552         }
 553
 554         return SDW_CMD_OK;
 555 }
 556
 557 static enum sdw_command_response
 558 _cdns_xfer_msg(struct sdw_cdns *cdns, struct sdw_msg *msg, int cmd,
 559                int offset, int count, bool defer)
 560 {
 561         unsigned long time;
 562         u32 base, i, data;
 563         u16 addr;
 564
 565         /* Program the watermark level for RX FIFO */
 566         if (cdns->msg_count != count) {
 567                 cdns_writel(cdns, CDNS_MCP_FIFOLEVEL, count);
 568                 cdns->msg_count = count;
 569         }
 570
 571         base = CDNS_MCP_CMD_BASE;
 572         addr = msg->addr + offset;
 573
 574         for (i = 0; i < count; i++) {
 575                 data = FIELD_PREP(CDNS_MCP_CMD_DEV_ADDR, msg->dev_num);
 576                 data |= FIELD_PREP(CDNS_MCP_CMD_COMMAND, cmd);
 577                 data |= FIELD_PREP(CDNS_MCP_CMD_REG_ADDR, addr);
 578                 addr++;
 579
 580                 if (msg->flags == SDW_MSG_FLAG_WRITE)
 581                         data |= msg->buf[i + offset];
 582
 583                 data |= FIELD_PREP(CDNS_MCP_CMD_SSP_TAG, msg->ssp_sync);
 584                 cdns_writel(cdns, base, data);
 585                 base += CDNS_MCP_CMD_WORD_LEN;
 586         }
 587
 588         if (defer)
 589                 return SDW_CMD_OK;
 590
 591         /* wait for timeout or response */
 592         time = wait_for_completion_timeout(&cdns->tx_complete,
 593                                            msecs_to_jiffies(CDNS_TX_TIMEOUT));
 594         if (!time) {
 595                 dev_err(cdns->dev, "IO transfer timed out, cmd %d device %d addr %x len %d\n",
 596                         cmd, msg->dev_num, msg->addr, msg->len);
 597                 msg->len = 0;
 598                 return SDW_CMD_TIMEOUT;
 599         }
 600
 601         return cdns_fill_msg_resp(cdns, msg, count, offset);
 602 }
 603
 604 static enum sdw_command_response
 605 cdns_program_scp_addr(struct sdw_cdns *cdns, struct sdw_msg *msg)
 606 {
 607         int nack = 0, no_ack = 0;
 608         unsigned long time;
 609         u32 data[2], base;
 610         int i;
 611
 612         /* Program the watermark level for RX FIFO */
 613         if (cdns->msg_count != CDNS_SCP_RX_FIFOLEVEL) {
 614                 cdns_writel(cdns, CDNS_MCP_FIFOLEVEL, CDNS_SCP_RX_FIFOLEVEL);
 615                 cdns->msg_count = CDNS_SCP_RX_FIFOLEVEL;
 616         }
 617
 618         data[0] = FIELD_PREP(CDNS_MCP_CMD_DEV_ADDR, msg->dev_num);
 619         data[0] |= FIELD_PREP(CDNS_MCP_CMD_COMMAND, 0x3);
 620         data[1] = data[0];
 621
 622         data[0] |= FIELD_PREP(CDNS_MCP_CMD_REG_ADDR, SDW_SCP_ADDRPAGE1);
 623         data[1] |= FIELD_PREP(CDNS_MCP_CMD_REG_ADDR, SDW_SCP_ADDRPAGE2);
 624
 625         data[0] |= msg->addr_page1;
 626         data[1] |= msg->addr_page2;
 627
 628         base = CDNS_MCP_CMD_BASE;
 629         cdns_writel(cdns, base, data[0]);
 630         base += CDNS_MCP_CMD_WORD_LEN;
 631         cdns_writel(cdns, base, data[1]);
 632
 633         time = wait_for_completion_timeout(&cdns->tx_complete,
 634                                            msecs_to_jiffies(CDNS_TX_TIMEOUT));
 635         if (!time) {
 636                 dev_err(cdns->dev, "SCP Msg trf timed out\n");
 637                 msg->len = 0;
 638                 return SDW_CMD_TIMEOUT;
 639         }
 640
 641         /* check response the writes */
 642         for (i = 0; i < 2; i++) {
 643                 if (!(cdns->response_buf[i] & CDNS_MCP_RESP_ACK)) {
 644                         no_ack = 1;
 645                         dev_err(cdns->dev, "Program SCP Ack not received\n");
 646                         if (cdns->response_buf[i] & CDNS_MCP_RESP_NACK) {
 647                                 nack = 1;
 648                                 dev_err(cdns->dev, "Program SCP NACK received\n");
 649                         }
 650                 }
 651         }
 652
 653         /* For NACK, NO ack, don't return err if we are in Broadcast mode */
 654         if (nack) {
 655                 dev_err_ratelimited(cdns->dev,
 656                                     "SCP_addrpage NACKed for Slave %d\n", msg->dev_num);
 657                 return SDW_CMD_FAIL;
 658         }
 659
 660         if (no_ack) {
 661                 dev_dbg_ratelimited(cdns->dev,
 662                                     "SCP_addrpage ignored for Slave %d\n", msg->dev_num);
 663                 return SDW_CMD_IGNORED;
 664         }
 665
 666         return SDW_CMD_OK;
 667 }
 668
 669 static int cdns_prep_msg(struct sdw_cdns *cdns, struct sdw_msg *msg, int *cmd)
 670 {
 671         int ret;
 672
 673         if (msg->page) {
 674                 ret = cdns_program_scp_addr(cdns, msg);
 675                 if (ret) {
 676                         msg->len = 0;
 677                         return ret;
 678                 }
 679         }
 680
 681         switch (msg->flags) {
 682         case SDW_MSG_FLAG_READ:
 683                 *cmd = CDNS_MCP_CMD_READ;
 684                 break;
 685
 686         case SDW_MSG_FLAG_WRITE:
 687                 *cmd = CDNS_MCP_CMD_WRITE;
 688                 break;
 689
 690         default:
 691                 dev_err(cdns->dev, "Invalid msg cmd: %d\n", msg->flags);
 692                 return -EINVAL;
 693         }
 694
 695         return 0;
 696 }
 697
 698 enum sdw_command_response
 699 cdns_xfer_msg(struct sdw_bus *bus, struct sdw_msg *msg)
 700 {
 701         struct sdw_cdns *cdns = bus_to_cdns(bus);
 702         int cmd = 0, ret, i;
 703
 704         ret = cdns_prep_msg(cdns, msg, &cmd);
 705         if (ret)
 706                 return SDW_CMD_FAIL_OTHER;
 707
 708         for (i = 0; i < msg->len / CDNS_MCP_CMD_LEN; i++) {
 709                 ret = _cdns_xfer_msg(cdns, msg, cmd, i * CDNS_MCP_CMD_LEN,
 710                                      CDNS_MCP_CMD_LEN, false);
 711                 if (ret != SDW_CMD_OK)
 712                         return ret;
 713         }
 714
 715         if (!(msg->len % CDNS_MCP_CMD_LEN))
 716                 return SDW_CMD_OK;
 717
 718         return _cdns_xfer_msg(cdns, msg, cmd, i * CDNS_MCP_CMD_LEN,
 719                               msg->len % CDNS_MCP_CMD_LEN, false);
 720 }
 721 EXPORT_SYMBOL(cdns_xfer_msg);
 722
 723 enum sdw_command_response
 724 cdns_xfer_msg_defer(struct sdw_bus *bus,
 725                     struct sdw_msg *msg, struct sdw_defer *defer)
 726 {
 727         struct sdw_cdns *cdns = bus_to_cdns(bus);
 728         int cmd = 0, ret;
 729
 730         /* for defer only 1 message is supported */
 731         if (msg->len > 1)
 732                 return -ENOTSUPP;
 733
 734         ret = cdns_prep_msg(cdns, msg, &cmd);
 735         if (ret)
 736                 return SDW_CMD_FAIL_OTHER;
 737
 738         cdns->defer = defer;
 739         cdns->defer->length = msg->len;
 740
 741         return _cdns_xfer_msg(cdns, msg, cmd, 0, msg->len, true);
 742 }
 743 EXPORT_SYMBOL(cdns_xfer_msg_defer);
 744
 745 enum sdw_command_response
 746 cdns_reset_page_addr(struct sdw_bus *bus, unsigned int dev_num)
 747 {
 748         struct sdw_cdns *cdns = bus_to_cdns(bus);
 749         struct sdw_msg msg;
 750
 751         /* Create dummy message with valid device number */
 752         memset(&msg, 0, sizeof(msg));
 753         msg.dev_num = dev_num;
 754
 755         return cdns_program_scp_addr(cdns, &msg);
 756 }
 757 EXPORT_SYMBOL(cdns_reset_page_addr);
 758
 759 u32 cdns_read_ping_status(struct sdw_bus *bus)
 760 {
 761         struct sdw_cdns *cdns = bus_to_cdns(bus);
 762
 763         return cdns_readl(cdns, CDNS_MCP_SLAVE_STAT);
 764 }
 765 EXPORT_SYMBOL(cdns_read_ping_status);
 766
 767 /*
 768  * IRQ handling
 769  */
 770
 771 static void cdns_read_response(struct sdw_cdns *cdns)
 772 {
 773         u32 num_resp, cmd_base;
 774         int i;
 775
 776         num_resp = cdns_readl(cdns, CDNS_MCP_FIFOSTAT);
 777         num_resp &= CDNS_MCP_RX_FIFO_AVAIL;
 778
 779         cmd_base = CDNS_MCP_CMD_BASE;
 780
 781         for (i = 0; i < num_resp; i++) {
 782                 cdns->response_buf[i] = cdns_readl(cdns, cmd_base);
 783                 cmd_base += CDNS_MCP_CMD_WORD_LEN;
 784         }
 785 }
 786
 787 static int cdns_update_slave_status(struct sdw_cdns *cdns,
 788                                     u64 slave_intstat)
 789 {
 790         enum sdw_slave_status status[SDW_MAX_DEVICES + 1];
 791         bool is_slave = false;
 792         u32 mask;
 793         u32 val;
 794         int i, set_status;
 795
 796         memset(status, 0, sizeof(status));
 797
 798         for (i = 0; i <= SDW_MAX_DEVICES; i++) {
 799                 mask = (slave_intstat >> (i * CDNS_MCP_SLAVE_STATUS_NUM)) &
 800                         CDNS_MCP_SLAVE_STATUS_BITS;
 801
 802                 set_status = 0;
 803
 804                 if (mask) {
 805                         is_slave = true;
 806
 807                         if (mask & CDNS_MCP_SLAVE_INTSTAT_RESERVED) {
 808                                 status[i] = SDW_SLAVE_RESERVED;
 809                                 set_status++;
 810                         }
 811
 812                         if (mask & CDNS_MCP_SLAVE_INTSTAT_ATTACHED) {
 813                                 status[i] = SDW_SLAVE_ATTACHED;
 814                                 set_status++;
 815                         }
 816
 817                         if (mask & CDNS_MCP_SLAVE_INTSTAT_ALERT) {
 818                                 status[i] = SDW_SLAVE_ALERT;
 819                                 set_status++;
 820                         }
 821
 822                         if (mask & CDNS_MCP_SLAVE_INTSTAT_NPRESENT) {
 823                                 status[i] = SDW_SLAVE_UNATTACHED;
 824                                 set_status++;
 825                         }
 826                 }
 827
 828                 /*
 829                  * check that there was a single reported Slave status and when
 830                  * there is not use the latest status extracted from PING commands
 831                  */
 832                 if (set_status != 1) {
 833                         val = cdns_readl(cdns, CDNS_MCP_SLAVE_STAT);
 834                         val >>= (i * 2);
 835
 836                         switch (val & 0x3) {
 837                         case 0:
 838                                 status[i] = SDW_SLAVE_UNATTACHED;
 839                                 break;
 840                         case 1:
 841                                 status[i] = SDW_SLAVE_ATTACHED;
 842                                 break;
 843                         case 2:
 844                                 status[i] = SDW_SLAVE_ALERT;
 845                                 break;
 846                         case 3:
 847                         default:
 848                                 status[i] = SDW_SLAVE_RESERVED;
 849                                 break;
 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         u32 device0_status;
 963         int retry_count = 0;
 964
 965         /*
 966          * Clear main interrupt first so we don't lose any assertions
 967          * that happen during this function.
 968          */
 969         cdns_writel(cdns, CDNS_MCP_INTSTAT, CDNS_MCP_INT_SLAVE_MASK);
 970
 971         slave0 = cdns_readl(cdns, CDNS_MCP_SLAVE_INTSTAT0);
 972         slave1 = cdns_readl(cdns, CDNS_MCP_SLAVE_INTSTAT1);
 973
 974         /*
 975          * Clear the bits before handling so we don't lose any
 976          * bits that re-assert.
 977          */
 978         cdns_writel(cdns, CDNS_MCP_SLAVE_INTSTAT0, slave0);
 979         cdns_writel(cdns, CDNS_MCP_SLAVE_INTSTAT1, slave1);
 980
 981         /* combine the two status */
 982         slave_intstat = ((u64)slave1 << 32) | slave0;
 983
 984         dev_dbg_ratelimited(cdns->dev, "Slave status change: 0x%llx\n", slave_intstat);
 985
 986 update_status:
 987         cdns_update_slave_status(cdns, slave_intstat);
 988
 989         /*
 990          * When there is more than one peripheral per link, it's
 991          * possible that a deviceB becomes attached after we deal with
 992          * the attachment of deviceA. Since the hardware does a
 993          * logical AND, the attachment of the second device does not
 994          * change the status seen by the driver.
 995          *
 996          * In that case, clearing the registers above would result in
 997          * the deviceB never being detected - until a change of status
 998          * is observed on the bus.
 999          *
1000          * To avoid this race condition, re-check if any device0 needs
1001          * attention with PING commands. There is no need to check for
1002          * ALERTS since they are not allowed until a non-zero
1003          * device_number is assigned.
1004          *
1005          * Do not clear the INTSTAT0/1. While looping to enumerate devices on
1006          * #0 there could be status changes on other devices - these must
1007          * be kept in the INTSTAT so they can be handled when all #0 devices
1008          * have been handled.
1009          */
1010
1011         device0_status = cdns_readl(cdns, CDNS_MCP_SLAVE_STAT);
1012         device0_status &= 3;
1013
1014         if (device0_status == SDW_SLAVE_ATTACHED) {
1015                 if (retry_count++ < SDW_MAX_DEVICES) {
1016                         dev_dbg_ratelimited(cdns->dev,
1017                                             "Device0 detected after clearing status, iteration %d\n",
1018                                             retry_count);
1019                         slave_intstat = CDNS_MCP_SLAVE_INTSTAT_ATTACHED;
1020                         goto update_status;
1021                 } else {
1022                         dev_err_ratelimited(cdns->dev,
1023                                             "Device0 detected after %d iterations\n",
1024                                             retry_count);
1025                 }
1026         }
1027
1028         /* unmask Slave interrupt now */
1029         cdns_updatel(cdns, CDNS_MCP_INTMASK,
1030                      CDNS_MCP_INT_SLAVE_MASK, CDNS_MCP_INT_SLAVE_MASK);
1031
1032 }
1033
1034 /* paranoia check to make sure self-cleared bits are indeed cleared */
1035 void sdw_cdns_check_self_clearing_bits(struct sdw_cdns *cdns, const char *string,
1036                                        bool initial_delay, int reset_iterations)
1037 {
1038         u32 mcp_control;
1039         u32 mcp_config_update;
1040         int i;
1041
1042         if (initial_delay)
1043                 usleep_range(1000, 1500);
1044
1045         mcp_control = cdns_readl(cdns, CDNS_MCP_CONTROL);
1046
1047         /* the following bits should be cleared immediately */
1048         if (mcp_control & CDNS_MCP_CONTROL_CMD_RST)
1049                 dev_err(cdns->dev, "%s failed: MCP_CONTROL_CMD_RST is not cleared\n", string);
1050         if (mcp_control & CDNS_MCP_CONTROL_SOFT_RST)
1051                 dev_err(cdns->dev, "%s failed: MCP_CONTROL_SOFT_RST is not cleared\n", string);
1052         if (mcp_control & CDNS_MCP_CONTROL_SW_RST)
1053                 dev_err(cdns->dev, "%s failed: MCP_CONTROL_SW_RST is not cleared\n", string);
1054         if (mcp_control & CDNS_MCP_CONTROL_CLK_STOP_CLR)
1055                 dev_err(cdns->dev, "%s failed: MCP_CONTROL_CLK_STOP_CLR is not cleared\n", string);
1056         mcp_config_update = cdns_readl(cdns, CDNS_MCP_CONFIG_UPDATE);
1057         if (mcp_config_update & CDNS_MCP_CONFIG_UPDATE_BIT)
1058                 dev_err(cdns->dev, "%s failed: MCP_CONFIG_UPDATE_BIT is not cleared\n", string);
1059
1060         i = 0;
1061         while (mcp_control & CDNS_MCP_CONTROL_HW_RST) {
1062                 if (i == reset_iterations) {
1063                         dev_err(cdns->dev, "%s failed: MCP_CONTROL_HW_RST is not cleared\n", string);
1064                         break;
1065                 }
1066
1067                 dev_dbg(cdns->dev, "%s: MCP_CONTROL_HW_RST is not cleared at iteration %d\n", string, i);
1068                 i++;
1069
1070                 usleep_range(1000, 1500);
1071                 mcp_control = cdns_readl(cdns, CDNS_MCP_CONTROL);
1072         }
1073
1074 }
1075 EXPORT_SYMBOL(sdw_cdns_check_self_clearing_bits);
1076
1077 /*
1078  * init routines
1079  */
1080
1081 /**
1082  * sdw_cdns_exit_reset() - Program reset parameters and start bus operations
1083  * @cdns: Cadence instance
1084  */
1085 int sdw_cdns_exit_reset(struct sdw_cdns *cdns)
1086 {
1087         /* keep reset delay unchanged to 4096 cycles */
1088
1089         /* use hardware generated reset */
1090         cdns_updatel(cdns, CDNS_MCP_CONTROL,
1091                      CDNS_MCP_CONTROL_HW_RST,
1092                      CDNS_MCP_CONTROL_HW_RST);
1093
1094         /* commit changes */
1095         cdns_updatel(cdns, CDNS_MCP_CONFIG_UPDATE,
1096                      CDNS_MCP_CONFIG_UPDATE_BIT,
1097                      CDNS_MCP_CONFIG_UPDATE_BIT);
1098
1099         /* don't wait here */
1100         return 0;
1101
1102 }
1103 EXPORT_SYMBOL(sdw_cdns_exit_reset);
1104
1105 /**
1106  * cdns_enable_slave_interrupts() - Enable SDW slave interrupts
1107  * @cdns: Cadence instance
1108  * @state: boolean for true/false
1109  */
1110 static void cdns_enable_slave_interrupts(struct sdw_cdns *cdns, bool state)
1111 {
1112         u32 mask;
1113
1114         mask = cdns_readl(cdns, CDNS_MCP_INTMASK);
1115         if (state)
1116                 mask |= CDNS_MCP_INT_SLAVE_MASK;
1117         else
1118                 mask &= ~CDNS_MCP_INT_SLAVE_MASK;
1119
1120         cdns_writel(cdns, CDNS_MCP_INTMASK, mask);
1121 }
1122
1123 /**
1124  * sdw_cdns_enable_interrupt() - Enable SDW interrupts
1125  * @cdns: Cadence instance
1126  * @state: True if we are trying to enable interrupt.
1127  */
1128 int sdw_cdns_enable_interrupt(struct sdw_cdns *cdns, bool state)
1129 {
1130         u32 slave_intmask0 = 0;
1131         u32 slave_intmask1 = 0;
1132         u32 mask = 0;
1133
1134         if (!state)
1135                 goto update_masks;
1136
1137         slave_intmask0 = CDNS_MCP_SLAVE_INTMASK0_MASK;
1138         slave_intmask1 = CDNS_MCP_SLAVE_INTMASK1_MASK;
1139
1140         /* enable detection of all slave state changes */
1141         mask = CDNS_MCP_INT_SLAVE_MASK;
1142
1143         /* enable detection of bus issues */
1144         mask |= CDNS_MCP_INT_CTRL_CLASH | CDNS_MCP_INT_DATA_CLASH |
1145                 CDNS_MCP_INT_PARITY;
1146
1147         /* port interrupt limited to test modes for now */
1148         if (cdns->bus.params.m_data_mode != SDW_PORT_DATA_MODE_NORMAL)
1149                 mask |= CDNS_MCP_INT_DPINT;
1150
1151         /* enable detection of RX fifo level */
1152         mask |= CDNS_MCP_INT_RX_WL;
1153
1154         /*
1155          * CDNS_MCP_INT_IRQ needs to be set otherwise all previous
1156          * settings are irrelevant
1157          */
1158         mask |= CDNS_MCP_INT_IRQ;
1159
1160         if (interrupt_mask) /* parameter override */
1161                 mask = interrupt_mask;
1162
1163 update_masks:
1164         /* clear slave interrupt status before enabling interrupt */
1165         if (state) {
1166                 u32 slave_state;
1167
1168                 slave_state = cdns_readl(cdns, CDNS_MCP_SLAVE_INTSTAT0);
1169                 cdns_writel(cdns, CDNS_MCP_SLAVE_INTSTAT0, slave_state);
1170                 slave_state = cdns_readl(cdns, CDNS_MCP_SLAVE_INTSTAT1);
1171                 cdns_writel(cdns, CDNS_MCP_SLAVE_INTSTAT1, slave_state);
1172         }
1173         cdns->interrupt_enabled = state;
1174
1175         /*
1176          * Complete any on-going status updates before updating masks,
1177          * and cancel queued status updates.
1178          *
1179          * There could be a race with a new interrupt thrown before
1180          * the 3 mask updates below are complete, so in the interrupt
1181          * we use the 'interrupt_enabled' status to prevent new work
1182          * from being queued.
1183          */
1184         if (!state)
1185                 cancel_work_sync(&cdns->work);
1186
1187         cdns_writel(cdns, CDNS_MCP_SLAVE_INTMASK0, slave_intmask0);
1188         cdns_writel(cdns, CDNS_MCP_SLAVE_INTMASK1, slave_intmask1);
1189         cdns_writel(cdns, CDNS_MCP_INTMASK, mask);
1190
1191         return 0;
1192 }
1193 EXPORT_SYMBOL(sdw_cdns_enable_interrupt);
1194
1195 static int cdns_allocate_pdi(struct sdw_cdns *cdns,
1196                              struct sdw_cdns_pdi **stream,
1197                              u32 num, u32 pdi_offset)
1198 {
1199         struct sdw_cdns_pdi *pdi;
1200         int i;
1201
1202         if (!num)
1203                 return 0;
1204
1205         pdi = devm_kcalloc(cdns->dev, num, sizeof(*pdi), GFP_KERNEL);
1206         if (!pdi)
1207                 return -ENOMEM;
1208
1209         for (i = 0; i < num; i++) {
1210                 pdi[i].num = i + pdi_offset;
1211         }
1212
1213         *stream = pdi;
1214         return 0;
1215 }
1216
1217 /**
1218  * sdw_cdns_pdi_init() - PDI initialization routine
1219  *
1220  * @cdns: Cadence instance
1221  * @config: Stream configurations
1222  */
1223 int sdw_cdns_pdi_init(struct sdw_cdns *cdns,
1224                       struct sdw_cdns_stream_config config)
1225 {
1226         struct sdw_cdns_streams *stream;
1227         int offset;
1228         int ret;
1229
1230         cdns->pcm.num_bd = config.pcm_bd;
1231         cdns->pcm.num_in = config.pcm_in;
1232         cdns->pcm.num_out = config.pcm_out;
1233
1234         /* Allocate PDIs for PCMs */
1235         stream = &cdns->pcm;
1236
1237         /* we allocate PDI0 and PDI1 which are used for Bulk */
1238         offset = 0;
1239
1240         ret = cdns_allocate_pdi(cdns, &stream->bd,
1241                                 stream->num_bd, offset);
1242         if (ret)
1243                 return ret;
1244
1245         offset += stream->num_bd;
1246
1247         ret = cdns_allocate_pdi(cdns, &stream->in,
1248                                 stream->num_in, offset);
1249         if (ret)
1250                 return ret;
1251
1252         offset += stream->num_in;
1253
1254         ret = cdns_allocate_pdi(cdns, &stream->out,
1255                                 stream->num_out, offset);
1256         if (ret)
1257                 return ret;
1258
1259         /* Update total number of PCM PDIs */
1260         stream->num_pdi = stream->num_bd + stream->num_in + stream->num_out;
1261         cdns->num_ports = stream->num_pdi;
1262
1263         return 0;
1264 }
1265 EXPORT_SYMBOL(sdw_cdns_pdi_init);
1266
1267 static u32 cdns_set_initial_frame_shape(int n_rows, int n_cols)
1268 {
1269         u32 val;
1270         int c;
1271         int r;
1272
1273         r = sdw_find_row_index(n_rows);
1274         c = sdw_find_col_index(n_cols);
1275
1276         val = FIELD_PREP(CDNS_MCP_FRAME_SHAPE_ROW_MASK, r);
1277         val |= FIELD_PREP(CDNS_MCP_FRAME_SHAPE_COL_MASK, c);
1278
1279         return val;
1280 }
1281
1282 static void cdns_init_clock_ctrl(struct sdw_cdns *cdns)
1283 {
1284         struct sdw_bus *bus = &cdns->bus;
1285         struct sdw_master_prop *prop = &bus->prop;
1286         u32 val;
1287         u32 ssp_interval;
1288         int divider;
1289
1290         /* Set clock divider */
1291         divider = (prop->mclk_freq / prop->max_clk_freq) - 1;
1292
1293         cdns_updatel(cdns, CDNS_MCP_CLK_CTRL0,
1294                      CDNS_MCP_CLK_MCLKD_MASK, divider);
1295         cdns_updatel(cdns, CDNS_MCP_CLK_CTRL1,
1296                      CDNS_MCP_CLK_MCLKD_MASK, divider);
1297
1298         /*
1299          * Frame shape changes after initialization have to be done
1300          * with the bank switch mechanism
1301          */
1302         val = cdns_set_initial_frame_shape(prop->default_row,
1303                                            prop->default_col);
1304         cdns_writel(cdns, CDNS_MCP_FRAME_SHAPE_INIT, val);
1305
1306         /* Set SSP interval to default value */
1307         ssp_interval = prop->default_frame_rate / SDW_CADENCE_GSYNC_HZ;
1308         cdns_writel(cdns, CDNS_MCP_SSP_CTRL0, ssp_interval);
1309         cdns_writel(cdns, CDNS_MCP_SSP_CTRL1, ssp_interval);
1310 }
1311
1312 /**
1313  * sdw_cdns_init() - Cadence initialization
1314  * @cdns: Cadence instance
1315  */
1316 int sdw_cdns_init(struct sdw_cdns *cdns)
1317 {
1318         u32 val;
1319
1320         cdns_init_clock_ctrl(cdns);
1321
1322         sdw_cdns_check_self_clearing_bits(cdns, __func__, false, 0);
1323
1324         /* reset msg_count to default value of FIFOLEVEL */
1325         cdns->msg_count = cdns_readl(cdns, CDNS_MCP_FIFOLEVEL);
1326
1327         /* flush command FIFOs */
1328         cdns_updatel(cdns, CDNS_MCP_CONTROL, CDNS_MCP_CONTROL_CMD_RST,
1329                      CDNS_MCP_CONTROL_CMD_RST);
1330
1331         /* Set cmd accept mode */
1332         cdns_updatel(cdns, CDNS_MCP_CONTROL, CDNS_MCP_CONTROL_CMD_ACCEPT,
1333                      CDNS_MCP_CONTROL_CMD_ACCEPT);
1334
1335         /* Configure mcp config */
1336         val = cdns_readl(cdns, CDNS_MCP_CONFIG);
1337
1338         /* enable bus operations with clock and data */
1339         val &= ~CDNS_MCP_CONFIG_OP;
1340         val |= CDNS_MCP_CONFIG_OP_NORMAL;
1341
1342         /* Set cmd mode for Tx and Rx cmds */
1343         val &= ~CDNS_MCP_CONFIG_CMD;
1344
1345         /* Disable sniffer mode */
1346         val &= ~CDNS_MCP_CONFIG_SNIFFER;
1347
1348         /* Disable auto bus release */
1349         val &= ~CDNS_MCP_CONFIG_BUS_REL;
1350
1351         if (cdns->bus.multi_link)
1352                 /* Set Multi-master mode to take gsync into account */
1353                 val |= CDNS_MCP_CONFIG_MMASTER;
1354
1355         /* leave frame delay to hardware default of 0x1F */
1356
1357         /* leave command retry to hardware default of 0 */
1358
1359         cdns_writel(cdns, CDNS_MCP_CONFIG, val);
1360
1361         /* changes will be committed later */
1362         return 0;
1363 }
1364 EXPORT_SYMBOL(sdw_cdns_init);
1365
1366 int cdns_bus_conf(struct sdw_bus *bus, struct sdw_bus_params *params)
1367 {
1368         struct sdw_master_prop *prop = &bus->prop;
1369         struct sdw_cdns *cdns = bus_to_cdns(bus);
1370         int mcp_clkctrl_off;
1371         int divider;
1372
1373         if (!params->curr_dr_freq) {
1374                 dev_err(cdns->dev, "NULL curr_dr_freq\n");
1375                 return -EINVAL;
1376         }
1377
1378         divider = prop->mclk_freq * SDW_DOUBLE_RATE_FACTOR /
1379                 params->curr_dr_freq;
1380         divider--; /* divider is 1/(N+1) */
1381
1382         if (params->next_bank)
1383                 mcp_clkctrl_off = CDNS_MCP_CLK_CTRL1;
1384         else
1385                 mcp_clkctrl_off = CDNS_MCP_CLK_CTRL0;
1386
1387         cdns_updatel(cdns, mcp_clkctrl_off, CDNS_MCP_CLK_MCLKD_MASK, divider);
1388
1389         return 0;
1390 }
1391 EXPORT_SYMBOL(cdns_bus_conf);
1392
1393 static int cdns_port_params(struct sdw_bus *bus,
1394                             struct sdw_port_params *p_params, unsigned int bank)
1395 {
1396         struct sdw_cdns *cdns = bus_to_cdns(bus);
1397         int dpn_config_off_source;
1398         int dpn_config_off_target;
1399         int target_num = p_params->num;
1400         int source_num = p_params->num;
1401         bool override = false;
1402         int dpn_config;
1403
1404         if (target_num == cdns->pdi_loopback_target &&
1405             cdns->pdi_loopback_source != -1) {
1406                 source_num = cdns->pdi_loopback_source;
1407                 override = true;
1408         }
1409
1410         if (bank) {
1411                 dpn_config_off_source = CDNS_DPN_B1_CONFIG(source_num);
1412                 dpn_config_off_target = CDNS_DPN_B1_CONFIG(target_num);
1413         } else {
1414                 dpn_config_off_source = CDNS_DPN_B0_CONFIG(source_num);
1415                 dpn_config_off_target = CDNS_DPN_B0_CONFIG(target_num);
1416         }
1417
1418         dpn_config = cdns_readl(cdns, dpn_config_off_source);
1419
1420         /* use port params if there is no loopback, otherwise use source as is */
1421         if (!override) {
1422                 u32p_replace_bits(&dpn_config, p_params->bps - 1, CDNS_DPN_CONFIG_WL);
1423                 u32p_replace_bits(&dpn_config, p_params->flow_mode, CDNS_DPN_CONFIG_PORT_FLOW);
1424                 u32p_replace_bits(&dpn_config, p_params->data_mode, CDNS_DPN_CONFIG_PORT_DAT);
1425         }
1426
1427         cdns_writel(cdns, dpn_config_off_target, dpn_config);
1428
1429         return 0;
1430 }
1431
1432 static int cdns_transport_params(struct sdw_bus *bus,
1433                                  struct sdw_transport_params *t_params,
1434                                  enum sdw_reg_bank bank)
1435 {
1436         struct sdw_cdns *cdns = bus_to_cdns(bus);
1437         int dpn_config;
1438         int dpn_config_off_source;
1439         int dpn_config_off_target;
1440         int dpn_hctrl;
1441         int dpn_hctrl_off_source;
1442         int dpn_hctrl_off_target;
1443         int dpn_offsetctrl;
1444         int dpn_offsetctrl_off_source;
1445         int dpn_offsetctrl_off_target;
1446         int dpn_samplectrl;
1447         int dpn_samplectrl_off_source;
1448         int dpn_samplectrl_off_target;
1449         int source_num = t_params->port_num;
1450         int target_num = t_params->port_num;
1451         bool override = false;
1452
1453         if (target_num == cdns->pdi_loopback_target &&
1454             cdns->pdi_loopback_source != -1) {
1455                 source_num = cdns->pdi_loopback_source;
1456                 override = true;
1457         }
1458
1459         /*
1460          * Note: Only full data port is supported on the Master side for
1461          * both PCM and PDM ports.
1462          */
1463
1464         if (bank) {
1465                 dpn_config_off_source = CDNS_DPN_B1_CONFIG(source_num);
1466                 dpn_hctrl_off_source = CDNS_DPN_B1_HCTRL(source_num);
1467                 dpn_offsetctrl_off_source = CDNS_DPN_B1_OFFSET_CTRL(source_num);
1468                 dpn_samplectrl_off_source = CDNS_DPN_B1_SAMPLE_CTRL(source_num);
1469
1470                 dpn_config_off_target = CDNS_DPN_B1_CONFIG(target_num);
1471                 dpn_hctrl_off_target = CDNS_DPN_B1_HCTRL(target_num);
1472                 dpn_offsetctrl_off_target = CDNS_DPN_B1_OFFSET_CTRL(target_num);
1473                 dpn_samplectrl_off_target = CDNS_DPN_B1_SAMPLE_CTRL(target_num);
1474
1475         } else {
1476                 dpn_config_off_source = CDNS_DPN_B0_CONFIG(source_num);
1477                 dpn_hctrl_off_source = CDNS_DPN_B0_HCTRL(source_num);
1478                 dpn_offsetctrl_off_source = CDNS_DPN_B0_OFFSET_CTRL(source_num);
1479                 dpn_samplectrl_off_source = CDNS_DPN_B0_SAMPLE_CTRL(source_num);
1480
1481                 dpn_config_off_target = CDNS_DPN_B0_CONFIG(target_num);
1482                 dpn_hctrl_off_target = CDNS_DPN_B0_HCTRL(target_num);
1483                 dpn_offsetctrl_off_target = CDNS_DPN_B0_OFFSET_CTRL(target_num);
1484                 dpn_samplectrl_off_target = CDNS_DPN_B0_SAMPLE_CTRL(target_num);
1485         }
1486
1487         dpn_config = cdns_readl(cdns, dpn_config_off_source);
1488         if (!override) {
1489                 u32p_replace_bits(&dpn_config, t_params->blk_grp_ctrl, CDNS_DPN_CONFIG_BGC);
1490                 u32p_replace_bits(&dpn_config, t_params->blk_pkg_mode, CDNS_DPN_CONFIG_BPM);
1491         }
1492         cdns_writel(cdns, dpn_config_off_target, dpn_config);
1493
1494         if (!override) {
1495                 dpn_offsetctrl = 0;
1496                 u32p_replace_bits(&dpn_offsetctrl, t_params->offset1, CDNS_DPN_OFFSET_CTRL_1);
1497                 u32p_replace_bits(&dpn_offsetctrl, t_params->offset2, CDNS_DPN_OFFSET_CTRL_2);
1498         } else {
1499                 dpn_offsetctrl = cdns_readl(cdns, dpn_offsetctrl_off_source);
1500         }
1501         cdns_writel(cdns, dpn_offsetctrl_off_target,  dpn_offsetctrl);
1502
1503         if (!override) {
1504                 dpn_hctrl = 0;
1505                 u32p_replace_bits(&dpn_hctrl, t_params->hstart, CDNS_DPN_HCTRL_HSTART);
1506                 u32p_replace_bits(&dpn_hctrl, t_params->hstop, CDNS_DPN_HCTRL_HSTOP);
1507                 u32p_replace_bits(&dpn_hctrl, t_params->lane_ctrl, CDNS_DPN_HCTRL_LCTRL);
1508         } else {
1509                 dpn_hctrl = cdns_readl(cdns, dpn_hctrl_off_source);
1510         }
1511         cdns_writel(cdns, dpn_hctrl_off_target, dpn_hctrl);
1512
1513         if (!override)
1514                 dpn_samplectrl = t_params->sample_interval - 1;
1515         else
1516                 dpn_samplectrl = cdns_readl(cdns, dpn_samplectrl_off_source);
1517         cdns_writel(cdns, dpn_samplectrl_off_target, dpn_samplectrl);
1518
1519         return 0;
1520 }
1521
1522 static int cdns_port_enable(struct sdw_bus *bus,
1523                             struct sdw_enable_ch *enable_ch, unsigned int bank)
1524 {
1525         struct sdw_cdns *cdns = bus_to_cdns(bus);
1526         int dpn_chnen_off, ch_mask;
1527
1528         if (bank)
1529                 dpn_chnen_off = CDNS_DPN_B1_CH_EN(enable_ch->port_num);
1530         else
1531                 dpn_chnen_off = CDNS_DPN_B0_CH_EN(enable_ch->port_num);
1532
1533         ch_mask = enable_ch->ch_mask * enable_ch->enable;
1534         cdns_writel(cdns, dpn_chnen_off, ch_mask);
1535
1536         return 0;
1537 }
1538
1539 static const struct sdw_master_port_ops cdns_port_ops = {
1540         .dpn_set_port_params = cdns_port_params,
1541         .dpn_set_port_transport_params = cdns_transport_params,
1542         .dpn_port_enable_ch = cdns_port_enable,
1543 };
1544
1545 /**
1546  * sdw_cdns_is_clock_stop: Check clock status
1547  *
1548  * @cdns: Cadence instance
1549  */
1550 bool sdw_cdns_is_clock_stop(struct sdw_cdns *cdns)
1551 {
1552         return !!(cdns_readl(cdns, CDNS_MCP_STAT) & CDNS_MCP_STAT_CLK_STOP);
1553 }
1554 EXPORT_SYMBOL(sdw_cdns_is_clock_stop);
1555
1556 /**
1557  * sdw_cdns_clock_stop: Cadence clock stop configuration routine
1558  *
1559  * @cdns: Cadence instance
1560  * @block_wake: prevent wakes if required by the platform
1561  */
1562 int sdw_cdns_clock_stop(struct sdw_cdns *cdns, bool block_wake)
1563 {
1564         bool slave_present = false;
1565         struct sdw_slave *slave;
1566         int ret;
1567
1568         sdw_cdns_check_self_clearing_bits(cdns, __func__, false, 0);
1569
1570         /* Check suspend status */
1571         if (sdw_cdns_is_clock_stop(cdns)) {
1572                 dev_dbg(cdns->dev, "Clock is already stopped\n");
1573                 return 0;
1574         }
1575
1576         /*
1577          * Before entering clock stop we mask the Slave
1578          * interrupts. This helps avoid having to deal with e.g. a
1579          * Slave becoming UNATTACHED while the clock is being stopped
1580          */
1581         cdns_enable_slave_interrupts(cdns, false);
1582
1583         /*
1584          * For specific platforms, it is required to be able to put
1585          * master into a state in which it ignores wake-up trials
1586          * in clock stop state
1587          */
1588         if (block_wake)
1589                 cdns_updatel(cdns, CDNS_MCP_CONTROL,
1590                              CDNS_MCP_CONTROL_BLOCK_WAKEUP,
1591                              CDNS_MCP_CONTROL_BLOCK_WAKEUP);
1592
1593         list_for_each_entry(slave, &cdns->bus.slaves, node) {
1594                 if (slave->status == SDW_SLAVE_ATTACHED ||
1595                     slave->status == SDW_SLAVE_ALERT) {
1596                         slave_present = true;
1597                         break;
1598                 }
1599         }
1600
1601         /* commit changes */
1602         ret = cdns_config_update(cdns);
1603         if (ret < 0) {
1604                 dev_err(cdns->dev, "%s: config_update failed\n", __func__);
1605                 return ret;
1606         }
1607
1608         /* Prepare slaves for clock stop */
1609         if (slave_present) {
1610                 ret = sdw_bus_prep_clk_stop(&cdns->bus);
1611                 if (ret < 0 && ret != -ENODATA) {
1612                         dev_err(cdns->dev, "prepare clock stop failed %d\n", ret);
1613                         return ret;
1614                 }
1615         }
1616
1617         /*
1618          * Enter clock stop mode and only report errors if there are
1619          * Slave devices present (ALERT or ATTACHED)
1620          */
1621         ret = sdw_bus_clk_stop(&cdns->bus);
1622         if (ret < 0 && slave_present && ret != -ENODATA) {
1623                 dev_err(cdns->dev, "bus clock stop failed %d\n", ret);
1624                 return ret;
1625         }
1626
1627         ret = cdns_set_wait(cdns, CDNS_MCP_STAT,
1628                             CDNS_MCP_STAT_CLK_STOP,
1629                             CDNS_MCP_STAT_CLK_STOP);
1630         if (ret < 0)
1631                 dev_err(cdns->dev, "Clock stop failed %d\n", ret);
1632
1633         return ret;
1634 }
1635 EXPORT_SYMBOL(sdw_cdns_clock_stop);
1636
1637 /**
1638  * sdw_cdns_clock_restart: Cadence PM clock restart configuration routine
1639  *
1640  * @cdns: Cadence instance
1641  * @bus_reset: context may be lost while in low power modes and the bus
1642  * may require a Severe Reset and re-enumeration after a wake.
1643  */
1644 int sdw_cdns_clock_restart(struct sdw_cdns *cdns, bool bus_reset)
1645 {
1646         int ret;
1647
1648         /* unmask Slave interrupts that were masked when stopping the clock */
1649         cdns_enable_slave_interrupts(cdns, true);
1650
1651         ret = cdns_clear_bit(cdns, CDNS_MCP_CONTROL,
1652                              CDNS_MCP_CONTROL_CLK_STOP_CLR);
1653         if (ret < 0) {
1654                 dev_err(cdns->dev, "Couldn't exit from clock stop\n");
1655                 return ret;
1656         }
1657
1658         ret = cdns_set_wait(cdns, CDNS_MCP_STAT, CDNS_MCP_STAT_CLK_STOP, 0);
1659         if (ret < 0) {
1660                 dev_err(cdns->dev, "clock stop exit failed %d\n", ret);
1661                 return ret;
1662         }
1663
1664         cdns_updatel(cdns, CDNS_MCP_CONTROL,
1665                      CDNS_MCP_CONTROL_BLOCK_WAKEUP, 0);
1666
1667         cdns_updatel(cdns, CDNS_MCP_CONTROL, CDNS_MCP_CONTROL_CMD_ACCEPT,
1668                      CDNS_MCP_CONTROL_CMD_ACCEPT);
1669
1670         if (!bus_reset) {
1671
1672                 /* enable bus operations with clock and data */
1673                 cdns_updatel(cdns, CDNS_MCP_CONFIG,
1674                              CDNS_MCP_CONFIG_OP,
1675                              CDNS_MCP_CONFIG_OP_NORMAL);
1676
1677                 ret = cdns_config_update(cdns);
1678                 if (ret < 0) {
1679                         dev_err(cdns->dev, "%s: config_update failed\n", __func__);
1680                         return ret;
1681                 }
1682
1683                 ret = sdw_bus_exit_clk_stop(&cdns->bus);
1684                 if (ret < 0)
1685                         dev_err(cdns->dev, "bus failed to exit clock stop %d\n", ret);
1686         }
1687
1688         return ret;
1689 }
1690 EXPORT_SYMBOL(sdw_cdns_clock_restart);
1691
1692 /**
1693  * sdw_cdns_probe() - Cadence probe routine
1694  * @cdns: Cadence instance
1695  */
1696 int sdw_cdns_probe(struct sdw_cdns *cdns)
1697 {
1698         init_completion(&cdns->tx_complete);
1699         cdns->bus.port_ops = &cdns_port_ops;
1700
1701         INIT_WORK(&cdns->work, cdns_update_slave_status_work);
1702         return 0;
1703 }
1704 EXPORT_SYMBOL(sdw_cdns_probe);
1705
1706 int cdns_set_sdw_stream(struct snd_soc_dai *dai,
1707                         void *stream, int direction)
1708 {
1709         struct sdw_cdns *cdns = snd_soc_dai_get_drvdata(dai);
1710         struct sdw_cdns_dma_data *dma;
1711
1712         if (stream) {
1713                 /* first paranoia check */
1714                 if (direction == SNDRV_PCM_STREAM_PLAYBACK)
1715                         dma = dai->playback_dma_data;
1716                 else
1717                         dma = dai->capture_dma_data;
1718
1719                 if (dma) {
1720                         dev_err(dai->dev,
1721                                 "dma_data already allocated for dai %s\n",
1722                                 dai->name);
1723                         return -EINVAL;
1724                 }
1725
1726                 /* allocate and set dma info */
1727                 dma = kzalloc(sizeof(*dma), GFP_KERNEL);
1728                 if (!dma)
1729                         return -ENOMEM;
1730
1731                 dma->stream_type = SDW_STREAM_PCM;
1732
1733                 dma->bus = &cdns->bus;
1734                 dma->link_id = cdns->instance;
1735
1736                 dma->stream = stream;
1737
1738                 if (direction == SNDRV_PCM_STREAM_PLAYBACK)
1739                         dai->playback_dma_data = dma;
1740                 else
1741                         dai->capture_dma_data = dma;
1742         } else {
1743                 /* for NULL stream we release allocated dma_data */
1744                 if (direction == SNDRV_PCM_STREAM_PLAYBACK) {
1745                         kfree(dai->playback_dma_data);
1746                         dai->playback_dma_data = NULL;
1747                 } else {
1748                         kfree(dai->capture_dma_data);
1749                         dai->capture_dma_data = NULL;
1750                 }
1751         }
1752         return 0;
1753 }
1754 EXPORT_SYMBOL(cdns_set_sdw_stream);
1755
1756 /**
1757  * cdns_find_pdi() - Find a free PDI
1758  *
1759  * @cdns: Cadence instance
1760  * @offset: Starting offset
1761  * @num: Number of PDIs
1762  * @pdi: PDI instances
1763  * @dai_id: DAI id
1764  *
1765  * Find a PDI for a given PDI array. The PDI num and dai_id are
1766  * expected to match, return NULL otherwise.
1767  */
1768 static struct sdw_cdns_pdi *cdns_find_pdi(struct sdw_cdns *cdns,
1769                                           unsigned int offset,
1770                                           unsigned int num,
1771                                           struct sdw_cdns_pdi *pdi,
1772                                           int dai_id)
1773 {
1774         int i;
1775
1776         for (i = offset; i < offset + num; i++)
1777                 if (pdi[i].num == dai_id)
1778                         return &pdi[i];
1779
1780         return NULL;
1781 }
1782
1783 /**
1784  * sdw_cdns_config_stream: Configure a stream
1785  *
1786  * @cdns: Cadence instance
1787  * @ch: Channel count
1788  * @dir: Data direction
1789  * @pdi: PDI to be used
1790  */
1791 void sdw_cdns_config_stream(struct sdw_cdns *cdns,
1792                             u32 ch, u32 dir, struct sdw_cdns_pdi *pdi)
1793 {
1794         u32 offset, val = 0;
1795
1796         if (dir == SDW_DATA_DIR_RX) {
1797                 val = CDNS_PORTCTRL_DIRN;
1798
1799                 if (cdns->bus.params.m_data_mode != SDW_PORT_DATA_MODE_NORMAL)
1800                         val |= CDNS_PORTCTRL_TEST_FAILED;
1801         }
1802         offset = CDNS_PORTCTRL + pdi->num * CDNS_PORT_OFFSET;
1803         cdns_updatel(cdns, offset,
1804                      CDNS_PORTCTRL_DIRN | CDNS_PORTCTRL_TEST_FAILED,
1805                      val);
1806
1807         val = pdi->num;
1808         val |= CDNS_PDI_CONFIG_SOFT_RESET;
1809         val |= FIELD_PREP(CDNS_PDI_CONFIG_CHANNEL, (1 << ch) - 1);
1810         cdns_writel(cdns, CDNS_PDI_CONFIG(pdi->num), val);
1811 }
1812 EXPORT_SYMBOL(sdw_cdns_config_stream);
1813
1814 /**
1815  * sdw_cdns_alloc_pdi() - Allocate a PDI
1816  *
1817  * @cdns: Cadence instance
1818  * @stream: Stream to be allocated
1819  * @ch: Channel count
1820  * @dir: Data direction
1821  * @dai_id: DAI id
1822  */
1823 struct sdw_cdns_pdi *sdw_cdns_alloc_pdi(struct sdw_cdns *cdns,
1824                                         struct sdw_cdns_streams *stream,
1825                                         u32 ch, u32 dir, int dai_id)
1826 {
1827         struct sdw_cdns_pdi *pdi = NULL;
1828
1829         if (dir == SDW_DATA_DIR_RX)
1830                 pdi = cdns_find_pdi(cdns, 0, stream->num_in, stream->in,
1831                                     dai_id);
1832         else
1833                 pdi = cdns_find_pdi(cdns, 0, stream->num_out, stream->out,
1834                                     dai_id);
1835
1836         /* check if we found a PDI, else find in bi-directional */
1837         if (!pdi)
1838                 pdi = cdns_find_pdi(cdns, 2, stream->num_bd, stream->bd,
1839                                     dai_id);
1840
1841         if (pdi) {
1842                 pdi->l_ch_num = 0;
1843                 pdi->h_ch_num = ch - 1;
1844                 pdi->dir = dir;
1845                 pdi->ch_count = ch;
1846         }
1847
1848         return pdi;
1849 }
1850 EXPORT_SYMBOL(sdw_cdns_alloc_pdi);
1851
1852 MODULE_LICENSE("Dual BSD/GPL");
1853 MODULE_DESCRIPTION("Cadence Soundwire Library");