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/cleanup.h>
  10 #include <linux/delay.h>
  11 #include <linux/device.h>
  12 #include <linux/debugfs.h>
  13 #include <linux/interrupt.h>
  14 #include <linux/io.h>
  15 #include <linux/module.h>
  16 #include <linux/mod_devicetable.h>
  17 #include <linux/pm_runtime.h>
  18 #include <linux/soundwire/sdw_registers.h>
  19 #include <linux/soundwire/sdw.h>
  20 #include <sound/pcm_params.h>
  21 #include <sound/soc.h>
  22 #include <linux/workqueue.h>
  23 #include "bus.h"
  24 #include "cadence_master.h"
  25
  26 static int interrupt_mask;
  27 module_param_named(cnds_mcp_int_mask, interrupt_mask, int, 0444);
  28 MODULE_PARM_DESC(cdns_mcp_int_mask, "Cadence MCP IntMask");
  29
  30 #define CDNS_MCP_CONFIG                         0x0
  31 #define CDNS_MCP_CONFIG_BUS_REL                 BIT(6)
  32
  33 #define CDNS_IP_MCP_CONFIG                      0x0 /* IP offset added at run-time */
  34
  35 #define CDNS_IP_MCP_CONFIG_MCMD_RETRY           GENMASK(27, 24)
  36 #define CDNS_IP_MCP_CONFIG_MPREQ_DELAY          GENMASK(20, 16)
  37 #define CDNS_IP_MCP_CONFIG_MMASTER              BIT(7)
  38 #define CDNS_IP_MCP_CONFIG_SNIFFER              BIT(5)
  39 #define CDNS_IP_MCP_CONFIG_CMD                  BIT(3)
  40 #define CDNS_IP_MCP_CONFIG_OP                   GENMASK(2, 0)
  41 #define CDNS_IP_MCP_CONFIG_OP_NORMAL            0
  42
  43 #define CDNS_MCP_CONTROL                        0x4
  44
  45 #define CDNS_MCP_CONTROL_CMD_RST                BIT(7)
  46 #define CDNS_MCP_CONTROL_SOFT_RST               BIT(6)
  47 #define CDNS_MCP_CONTROL_HW_RST                 BIT(4)
  48 #define CDNS_MCP_CONTROL_CLK_STOP_CLR           BIT(2)
  49
  50 #define CDNS_IP_MCP_CONTROL                     0x4  /* IP offset added at run-time */
  51
  52 #define CDNS_IP_MCP_CONTROL_RST_DELAY           GENMASK(10, 8)
  53 #define CDNS_IP_MCP_CONTROL_SW_RST              BIT(5)
  54 #define CDNS_IP_MCP_CONTROL_CLK_PAUSE           BIT(3)
  55 #define CDNS_IP_MCP_CONTROL_CMD_ACCEPT          BIT(1)
  56 #define CDNS_IP_MCP_CONTROL_BLOCK_WAKEUP        BIT(0)
  57
  58 #define CDNS_IP_MCP_CMDCTRL                     0x8 /* IP offset added at run-time */
  59
  60 #define CDNS_IP_MCP_CMDCTRL_INSERT_PARITY_ERR   BIT(2)
  61
  62 #define CDNS_MCP_SSPSTAT                        0xC
  63 #define CDNS_MCP_FRAME_SHAPE                    0x10
  64 #define CDNS_MCP_FRAME_SHAPE_INIT               0x14
  65 #define CDNS_MCP_FRAME_SHAPE_COL_MASK           GENMASK(2, 0)
  66 #define CDNS_MCP_FRAME_SHAPE_ROW_MASK           GENMASK(7, 3)
  67
  68 #define CDNS_MCP_CONFIG_UPDATE                  0x18
  69 #define CDNS_MCP_CONFIG_UPDATE_BIT              BIT(0)
  70
  71 #define CDNS_MCP_PHYCTRL                        0x1C
  72 #define CDNS_MCP_SSP_CTRL0                      0x20
  73 #define CDNS_MCP_SSP_CTRL1                      0x28
  74 #define CDNS_MCP_CLK_CTRL0                      0x30
  75 #define CDNS_MCP_CLK_CTRL1                      0x38
  76 #define CDNS_MCP_CLK_MCLKD_MASK         GENMASK(7, 0)
  77
  78 #define CDNS_MCP_STAT                           0x40
  79
  80 #define CDNS_MCP_STAT_ACTIVE_BANK               BIT(20)
  81 #define CDNS_MCP_STAT_CLK_STOP                  BIT(16)
  82
  83 #define CDNS_MCP_INTSTAT                        0x44
  84 #define CDNS_MCP_INTMASK                        0x48
  85
  86 #define CDNS_MCP_INT_IRQ                        BIT(31)
  87 #define CDNS_MCP_INT_RESERVED1                  GENMASK(30, 17)
  88 #define CDNS_MCP_INT_WAKEUP                     BIT(16)
  89 #define CDNS_MCP_INT_SLAVE_RSVD                 BIT(15)
  90 #define CDNS_MCP_INT_SLAVE_ALERT                BIT(14)
  91 #define CDNS_MCP_INT_SLAVE_ATTACH               BIT(13)
  92 #define CDNS_MCP_INT_SLAVE_NATTACH              BIT(12)
  93 #define CDNS_MCP_INT_SLAVE_MASK                 GENMASK(15, 12)
  94 #define CDNS_MCP_INT_DPINT                      BIT(11)
  95 #define CDNS_MCP_INT_CTRL_CLASH                 BIT(10)
  96 #define CDNS_MCP_INT_DATA_CLASH                 BIT(9)
  97 #define CDNS_MCP_INT_PARITY                     BIT(8)
  98 #define CDNS_MCP_INT_CMD_ERR                    BIT(7)
  99 #define CDNS_MCP_INT_RESERVED2                  GENMASK(6, 4)
 100 #define CDNS_MCP_INT_RX_NE                      BIT(3)
 101 #define CDNS_MCP_INT_RX_WL                      BIT(2)
 102 #define CDNS_MCP_INT_TXE                        BIT(1)
 103 #define CDNS_MCP_INT_TXF                        BIT(0)
 104 #define CDNS_MCP_INT_RESERVED (CDNS_MCP_INT_RESERVED1 | CDNS_MCP_INT_RESERVED2)
 105
 106 #define CDNS_MCP_INTSET                         0x4C
 107
 108 #define CDNS_MCP_SLAVE_STAT                     0x50
 109 #define CDNS_MCP_SLAVE_STAT_MASK                GENMASK(1, 0)
 110
 111 #define CDNS_MCP_SLAVE_INTSTAT0                 0x54
 112 #define CDNS_MCP_SLAVE_INTSTAT1                 0x58
 113 #define CDNS_MCP_SLAVE_INTSTAT_NPRESENT         BIT(0)
 114 #define CDNS_MCP_SLAVE_INTSTAT_ATTACHED         BIT(1)
 115 #define CDNS_MCP_SLAVE_INTSTAT_ALERT            BIT(2)
 116 #define CDNS_MCP_SLAVE_INTSTAT_RESERVED         BIT(3)
 117 #define CDNS_MCP_SLAVE_STATUS_BITS              GENMASK(3, 0)
 118 #define CDNS_MCP_SLAVE_STATUS_NUM               4
 119
 120 #define CDNS_MCP_SLAVE_INTMASK0                 0x5C
 121 #define CDNS_MCP_SLAVE_INTMASK1                 0x60
 122
 123 #define CDNS_MCP_SLAVE_INTMASK0_MASK            GENMASK(31, 0)
 124 #define CDNS_MCP_SLAVE_INTMASK1_MASK            GENMASK(15, 0)
 125
 126 #define CDNS_MCP_PORT_INTSTAT                   0x64
 127 #define CDNS_MCP_PDI_STAT                       0x6C
 128
 129 #define CDNS_MCP_FIFOLEVEL                      0x78
 130 #define CDNS_MCP_FIFOSTAT                       0x7C
 131 #define CDNS_MCP_RX_FIFO_AVAIL                  GENMASK(5, 0)
 132
 133 #define CDNS_IP_MCP_CMD_BASE                    0x80 /* IP offset added at run-time */
 134 #define CDNS_IP_MCP_RESP_BASE                   0x80 /* IP offset added at run-time */
 135 /* FIFO can hold 8 commands */
 136 #define CDNS_MCP_CMD_LEN                        8
 137 #define CDNS_MCP_CMD_WORD_LEN                   0x4
 138
 139 #define CDNS_MCP_CMD_SSP_TAG                    BIT(31)
 140 #define CDNS_MCP_CMD_COMMAND                    GENMASK(30, 28)
 141 #define CDNS_MCP_CMD_DEV_ADDR                   GENMASK(27, 24)
 142 #define CDNS_MCP_CMD_REG_ADDR                   GENMASK(23, 8)
 143 #define CDNS_MCP_CMD_REG_DATA                   GENMASK(7, 0)
 144
 145 #define CDNS_MCP_CMD_READ                       2
 146 #define CDNS_MCP_CMD_WRITE                      3
 147
 148 #define CDNS_MCP_RESP_RDATA                     GENMASK(15, 8)
 149 #define CDNS_MCP_RESP_ACK                       BIT(0)
 150 #define CDNS_MCP_RESP_NACK                      BIT(1)
 151
 152 #define CDNS_DP_SIZE                            128
 153
 154 #define CDNS_DPN_B0_CONFIG(n)                   (0x100 + CDNS_DP_SIZE * (n))
 155 #define CDNS_DPN_B0_CH_EN(n)                    (0x104 + CDNS_DP_SIZE * (n))
 156 #define CDNS_DPN_B0_SAMPLE_CTRL(n)              (0x108 + CDNS_DP_SIZE * (n))
 157 #define CDNS_DPN_B0_OFFSET_CTRL(n)              (0x10C + CDNS_DP_SIZE * (n))
 158 #define CDNS_DPN_B0_HCTRL(n)                    (0x110 + CDNS_DP_SIZE * (n))
 159 #define CDNS_DPN_B0_ASYNC_CTRL(n)               (0x114 + CDNS_DP_SIZE * (n))
 160
 161 #define CDNS_DPN_B1_CONFIG(n)                   (0x118 + CDNS_DP_SIZE * (n))
 162 #define CDNS_DPN_B1_CH_EN(n)                    (0x11C + CDNS_DP_SIZE * (n))
 163 #define CDNS_DPN_B1_SAMPLE_CTRL(n)              (0x120 + CDNS_DP_SIZE * (n))
 164 #define CDNS_DPN_B1_OFFSET_CTRL(n)              (0x124 + CDNS_DP_SIZE * (n))
 165 #define CDNS_DPN_B1_HCTRL(n)                    (0x128 + CDNS_DP_SIZE * (n))
 166 #define CDNS_DPN_B1_ASYNC_CTRL(n)               (0x12C + CDNS_DP_SIZE * (n))
 167
 168 #define CDNS_DPN_CONFIG_BPM                     BIT(18)
 169 #define CDNS_DPN_CONFIG_BGC                     GENMASK(17, 16)
 170 #define CDNS_DPN_CONFIG_WL                      GENMASK(12, 8)
 171 #define CDNS_DPN_CONFIG_PORT_DAT                GENMASK(3, 2)
 172 #define CDNS_DPN_CONFIG_PORT_FLOW               GENMASK(1, 0)
 173
 174 #define CDNS_DPN_SAMPLE_CTRL_SI                 GENMASK(15, 0)
 175
 176 #define CDNS_DPN_OFFSET_CTRL_1                  GENMASK(7, 0)
 177 #define CDNS_DPN_OFFSET_CTRL_2                  GENMASK(15, 8)
 178
 179 #define CDNS_DPN_HCTRL_HSTOP                    GENMASK(3, 0)
 180 #define CDNS_DPN_HCTRL_HSTART                   GENMASK(7, 4)
 181 #define CDNS_DPN_HCTRL_LCTRL                    GENMASK(10, 8)
 182
 183 #define CDNS_PORTCTRL                           0x130
 184 #define CDNS_PORTCTRL_TEST_FAILED               BIT(1)
 185 #define CDNS_PORTCTRL_DIRN                      BIT(7)
 186 #define CDNS_PORTCTRL_BANK_INVERT               BIT(8)
 187
 188 #define CDNS_PORT_OFFSET                        0x80
 189
 190 #define CDNS_PDI_CONFIG(n)                      (0x1100 + (n) * 16)
 191
 192 #define CDNS_PDI_CONFIG_SOFT_RESET              BIT(24)
 193 #define CDNS_PDI_CONFIG_CHANNEL                 GENMASK(15, 8)
 194 #define CDNS_PDI_CONFIG_PORT                    GENMASK(4, 0)
 195
 196 /* Driver defaults */
 197 #define CDNS_TX_TIMEOUT                         500
 198
 199 #define CDNS_SCP_RX_FIFOLEVEL                   0x2
 200
 201 /*
 202  * register accessor helpers
 203  */
 204 static inline u32 cdns_readl(struct sdw_cdns *cdns, int offset)
 205 {
 206         return readl(cdns->registers + offset);
 207 }
 208
 209 static inline void cdns_writel(struct sdw_cdns *cdns, int offset, u32 value)
 210 {
 211         writel(value, cdns->registers + offset);
 212 }
 213
 214 static inline u32 cdns_ip_readl(struct sdw_cdns *cdns, int offset)
 215 {
 216         return cdns_readl(cdns, cdns->ip_offset + offset);
 217 }
 218
 219 static inline void cdns_ip_writel(struct sdw_cdns *cdns, int offset, u32 value)
 220 {
 221         return cdns_writel(cdns, cdns->ip_offset + offset, value);
 222 }
 223
 224 static inline void cdns_updatel(struct sdw_cdns *cdns,
 225                                 int offset, u32 mask, u32 val)
 226 {
 227         u32 tmp;
 228
 229         tmp = cdns_readl(cdns, offset);
 230         tmp = (tmp & ~mask) | val;
 231         cdns_writel(cdns, offset, tmp);
 232 }
 233
 234 static inline void cdns_ip_updatel(struct sdw_cdns *cdns,
 235                                    int offset, u32 mask, u32 val)
 236 {
 237         cdns_updatel(cdns, cdns->ip_offset + offset, mask, val);
 238 }
 239
 240 static int cdns_set_wait(struct sdw_cdns *cdns, int offset, u32 mask, u32 value)
 241 {
 242         int timeout = 10;
 243         u32 reg_read;
 244
 245         /* Wait for bit to be set */
 246         do {
 247                 reg_read = readl(cdns->registers + offset);
 248                 if ((reg_read & mask) == value)
 249                         return 0;
 250
 251                 timeout--;
 252                 usleep_range(50, 100);
 253         } while (timeout != 0);
 254
 255         return -ETIMEDOUT;
 256 }
 257
 258 static int cdns_clear_bit(struct sdw_cdns *cdns, int offset, u32 value)
 259 {
 260         writel(value, cdns->registers + offset);
 261
 262         /* Wait for bit to be self cleared */
 263         return cdns_set_wait(cdns, offset, value, 0);
 264 }
 265
 266 /*
 267  * all changes to the MCP_CONFIG, MCP_CONTROL, MCP_CMDCTRL and MCP_PHYCTRL
 268  * need to be confirmed with a write to MCP_CONFIG_UPDATE
 269  */
 270 static int cdns_config_update(struct sdw_cdns *cdns)
 271 {
 272         int ret;
 273
 274         if (sdw_cdns_is_clock_stop(cdns)) {
 275                 dev_err(cdns->dev, "Cannot program MCP_CONFIG_UPDATE in ClockStopMode\n");
 276                 return -EINVAL;
 277         }
 278
 279         ret = cdns_clear_bit(cdns, CDNS_MCP_CONFIG_UPDATE,
 280                              CDNS_MCP_CONFIG_UPDATE_BIT);
 281         if (ret < 0)
 282                 dev_err(cdns->dev, "Config update timedout\n");
 283
 284         return ret;
 285 }
 286
 287 /**
 288  * sdw_cdns_config_update() - Update configurations
 289  * @cdns: Cadence instance
 290  */
 291 void sdw_cdns_config_update(struct sdw_cdns *cdns)
 292 {
 293         /* commit changes */
 294         cdns_writel(cdns, CDNS_MCP_CONFIG_UPDATE, CDNS_MCP_CONFIG_UPDATE_BIT);
 295 }
 296 EXPORT_SYMBOL(sdw_cdns_config_update);
 297
 298 /**
 299  * sdw_cdns_config_update_set_wait() - wait until configuration update bit is self-cleared
 300  * @cdns: Cadence instance
 301  */
 302 int sdw_cdns_config_update_set_wait(struct sdw_cdns *cdns)
 303 {
 304         /* the hardware recommendation is to wait at least 300us */
 305         return cdns_set_wait(cdns, CDNS_MCP_CONFIG_UPDATE,
 306                              CDNS_MCP_CONFIG_UPDATE_BIT, 0);
 307 }
 308 EXPORT_SYMBOL(sdw_cdns_config_update_set_wait);
 309
 310 /*
 311  * debugfs
 312  */
 313 #ifdef CONFIG_DEBUG_FS
 314
 315 #define RD_BUF (2 * PAGE_SIZE)
 316
 317 static ssize_t cdns_sprintf(struct sdw_cdns *cdns,
 318                             char *buf, size_t pos, unsigned int reg)
 319 {
 320         return scnprintf(buf + pos, RD_BUF - pos,
 321                          "%4x\t%8x\n", reg, cdns_readl(cdns, reg));
 322 }
 323
 324 static int cdns_reg_show(struct seq_file *s, void *data)
 325 {
 326         struct sdw_cdns *cdns = s->private;
 327         ssize_t ret;
 328         int num_ports;
 329         int i, j;
 330
 331         char *buf __free(kfree) = kzalloc(RD_BUF, GFP_KERNEL);
 332         if (!buf)
 333                 return -ENOMEM;
 334
 335         ret = scnprintf(buf, RD_BUF, "Register  Value\n");
 336         ret += scnprintf(buf + ret, RD_BUF - ret, "\nMCP Registers\n");
 337         /* 8 MCP registers */
 338         for (i = CDNS_MCP_CONFIG; i <= CDNS_MCP_PHYCTRL; i += sizeof(u32))
 339                 ret += cdns_sprintf(cdns, buf, ret, i);
 340
 341         ret += scnprintf(buf + ret, RD_BUF - ret,
 342                          "\nStatus & Intr Registers\n");
 343         /* 13 Status & Intr registers (offsets 0x70 and 0x74 not defined) */
 344         for (i = CDNS_MCP_STAT; i <=  CDNS_MCP_FIFOSTAT; i += sizeof(u32))
 345                 ret += cdns_sprintf(cdns, buf, ret, i);
 346
 347         ret += scnprintf(buf + ret, RD_BUF - ret,
 348                          "\nSSP & Clk ctrl Registers\n");
 349         ret += cdns_sprintf(cdns, buf, ret, CDNS_MCP_SSP_CTRL0);
 350         ret += cdns_sprintf(cdns, buf, ret, CDNS_MCP_SSP_CTRL1);
 351         ret += cdns_sprintf(cdns, buf, ret, CDNS_MCP_CLK_CTRL0);
 352         ret += cdns_sprintf(cdns, buf, ret, CDNS_MCP_CLK_CTRL1);
 353
 354         ret += scnprintf(buf + ret, RD_BUF - ret,
 355                          "\nDPn B0 Registers\n");
 356
 357         num_ports = cdns->num_ports;
 358
 359         for (i = 0; i < num_ports; i++) {
 360                 ret += scnprintf(buf + ret, RD_BUF - ret,
 361                                  "\nDP-%d\n", i);
 362                 for (j = CDNS_DPN_B0_CONFIG(i);
 363                      j < CDNS_DPN_B0_ASYNC_CTRL(i); j += sizeof(u32))
 364                         ret += cdns_sprintf(cdns, buf, ret, j);
 365         }
 366
 367         ret += scnprintf(buf + ret, RD_BUF - ret,
 368                          "\nDPn B1 Registers\n");
 369         for (i = 0; i < num_ports; i++) {
 370                 ret += scnprintf(buf + ret, RD_BUF - ret,
 371                                  "\nDP-%d\n", i);
 372
 373                 for (j = CDNS_DPN_B1_CONFIG(i);
 374                      j < CDNS_DPN_B1_ASYNC_CTRL(i); j += sizeof(u32))
 375                         ret += cdns_sprintf(cdns, buf, ret, j);
 376         }
 377
 378         ret += scnprintf(buf + ret, RD_BUF - ret,
 379                          "\nDPn Control Registers\n");
 380         for (i = 0; i < num_ports; i++)
 381                 ret += cdns_sprintf(cdns, buf, ret,
 382                                 CDNS_PORTCTRL + i * CDNS_PORT_OFFSET);
 383
 384         ret += scnprintf(buf + ret, RD_BUF - ret,
 385                          "\nPDIn Config Registers\n");
 386
 387         /* number of PDI and ports is interchangeable */
 388         for (i = 0; i < num_ports; i++)
 389                 ret += cdns_sprintf(cdns, buf, ret, CDNS_PDI_CONFIG(i));
 390
 391         seq_printf(s, "%s", buf);
 392
 393         return 0;
 394 }
 395 DEFINE_SHOW_ATTRIBUTE(cdns_reg);
 396
 397 static int cdns_hw_reset(void *data, u64 value)
 398 {
 399         struct sdw_cdns *cdns = data;
 400         int ret;
 401
 402         if (value != 1)
 403                 return -EINVAL;
 404
 405         /* Userspace changed the hardware state behind the kernel's back */
 406         add_taint(TAINT_USER, LOCKDEP_STILL_OK);
 407
 408         ret = sdw_cdns_exit_reset(cdns);
 409
 410         dev_dbg(cdns->dev, "link hw_reset done: %d\n", ret);
 411
 412         return ret;
 413 }
 414
 415 DEFINE_DEBUGFS_ATTRIBUTE(cdns_hw_reset_fops, NULL, cdns_hw_reset, "%llu\n");
 416
 417 static int cdns_parity_error_injection(void *data, u64 value)
 418 {
 419         struct sdw_cdns *cdns = data;
 420         struct sdw_bus *bus;
 421         int ret;
 422
 423         if (value != 1)
 424                 return -EINVAL;
 425
 426         bus = &cdns->bus;
 427
 428         /*
 429          * Resume Master device. If this results in a bus reset, the
 430          * Slave devices will re-attach and be re-enumerated.
 431          */
 432         ret = pm_runtime_resume_and_get(bus->dev);
 433         if (ret < 0 && ret != -EACCES) {
 434                 dev_err_ratelimited(cdns->dev,
 435                                     "pm_runtime_resume_and_get failed in %s, ret %d\n",
 436                                     __func__, ret);
 437                 return ret;
 438         }
 439
 440         /*
 441          * wait long enough for Slave(s) to be in steady state. This
 442          * does not need to be super precise.
 443          */
 444         msleep(200);
 445
 446         /*
 447          * Take the bus lock here to make sure that any bus transactions
 448          * will be queued while we inject a parity error on a dummy read
 449          */
 450         mutex_lock(&bus->bus_lock);
 451
 452         /* program hardware to inject parity error */
 453         cdns_ip_updatel(cdns, CDNS_IP_MCP_CMDCTRL,
 454                         CDNS_IP_MCP_CMDCTRL_INSERT_PARITY_ERR,
 455                         CDNS_IP_MCP_CMDCTRL_INSERT_PARITY_ERR);
 456
 457         /* commit changes */
 458         ret = cdns_clear_bit(cdns, CDNS_MCP_CONFIG_UPDATE, CDNS_MCP_CONFIG_UPDATE_BIT);
 459         if (ret < 0)
 460                 goto unlock;
 461
 462         /* do a broadcast dummy read to avoid bus clashes */
 463         ret = sdw_bread_no_pm_unlocked(&cdns->bus, 0xf, SDW_SCP_DEVID_0);
 464         dev_info(cdns->dev, "parity error injection, read: %d\n", ret);
 465
 466         /* program hardware to disable parity error */
 467         cdns_ip_updatel(cdns, CDNS_IP_MCP_CMDCTRL,
 468                         CDNS_IP_MCP_CMDCTRL_INSERT_PARITY_ERR,
 469                         0);
 470
 471         /* commit changes */
 472         ret = cdns_clear_bit(cdns, CDNS_MCP_CONFIG_UPDATE, CDNS_MCP_CONFIG_UPDATE_BIT);
 473         if (ret < 0)
 474                 goto unlock;
 475
 476         /* Userspace changed the hardware state behind the kernel's back */
 477         add_taint(TAINT_USER, LOCKDEP_STILL_OK);
 478
 479 unlock:
 480         /* Continue bus operation with parity error injection disabled */
 481         mutex_unlock(&bus->bus_lock);
 482
 483         /*
 484          * allow Master device to enter pm_runtime suspend. This may
 485          * also result in Slave devices suspending.
 486          */
 487         pm_runtime_mark_last_busy(bus->dev);
 488         pm_runtime_put_autosuspend(bus->dev);
 489
 490         return 0;
 491 }
 492
 493 DEFINE_DEBUGFS_ATTRIBUTE(cdns_parity_error_fops, NULL,
 494                          cdns_parity_error_injection, "%llu\n");
 495
 496 static int cdns_set_pdi_loopback_source(void *data, u64 value)
 497 {
 498         struct sdw_cdns *cdns = data;
 499         unsigned int pdi_out_num = cdns->pcm.num_bd + cdns->pcm.num_out;
 500
 501         if (value > pdi_out_num)
 502                 return -EINVAL;
 503
 504         /* Userspace changed the hardware state behind the kernel's back */
 505         add_taint(TAINT_USER, LOCKDEP_STILL_OK);
 506
 507         cdns->pdi_loopback_source = value;
 508
 509         return 0;
 510 }
 511 DEFINE_DEBUGFS_ATTRIBUTE(cdns_pdi_loopback_source_fops, NULL, cdns_set_pdi_loopback_source, "%llu\n");
 512
 513 static int cdns_set_pdi_loopback_target(void *data, u64 value)
 514 {
 515         struct sdw_cdns *cdns = data;
 516         unsigned int pdi_in_num = cdns->pcm.num_bd + cdns->pcm.num_in;
 517
 518         if (value > pdi_in_num)
 519                 return -EINVAL;
 520
 521         /* Userspace changed the hardware state behind the kernel's back */
 522         add_taint(TAINT_USER, LOCKDEP_STILL_OK);
 523
 524         cdns->pdi_loopback_target = value;
 525
 526         return 0;
 527 }
 528 DEFINE_DEBUGFS_ATTRIBUTE(cdns_pdi_loopback_target_fops, NULL, cdns_set_pdi_loopback_target, "%llu\n");
 529
 530 /**
 531  * sdw_cdns_debugfs_init() - Cadence debugfs init
 532  * @cdns: Cadence instance
 533  * @root: debugfs root
 534  */
 535 void sdw_cdns_debugfs_init(struct sdw_cdns *cdns, struct dentry *root)
 536 {
 537         debugfs_create_file("cdns-registers", 0400, root, cdns, &cdns_reg_fops);
 538
 539         debugfs_create_file("cdns-hw-reset", 0200, root, cdns,
 540                             &cdns_hw_reset_fops);
 541
 542         debugfs_create_file("cdns-parity-error-injection", 0200, root, cdns,
 543                             &cdns_parity_error_fops);
 544
 545         cdns->pdi_loopback_source = -1;
 546         cdns->pdi_loopback_target = -1;
 547
 548         debugfs_create_file("cdns-pdi-loopback-source", 0200, root, cdns,
 549                             &cdns_pdi_loopback_source_fops);
 550
 551         debugfs_create_file("cdns-pdi-loopback-target", 0200, root, cdns,
 552                             &cdns_pdi_loopback_target_fops);
 553
 554 }
 555 EXPORT_SYMBOL_GPL(sdw_cdns_debugfs_init);
 556
 557 #endif /* CONFIG_DEBUG_FS */
 558
 559 /*
 560  * IO Calls
 561  */
 562 static enum sdw_command_response
 563 cdns_fill_msg_resp(struct sdw_cdns *cdns,
 564                    struct sdw_msg *msg, int count, int offset)
 565 {
 566         int nack = 0, no_ack = 0;
 567         int i;
 568
 569         /* check message response */
 570         for (i = 0; i < count; i++) {
 571                 if (!(cdns->response_buf[i] & CDNS_MCP_RESP_ACK)) {
 572                         no_ack = 1;
 573                         dev_vdbg(cdns->dev, "Msg Ack not received, cmd %d\n", i);
 574                 }
 575                 if (cdns->response_buf[i] & CDNS_MCP_RESP_NACK) {
 576                         nack = 1;
 577                         dev_err_ratelimited(cdns->dev, "Msg NACK received, cmd %d\n", i);
 578                 }
 579         }
 580
 581         if (nack) {
 582                 dev_err_ratelimited(cdns->dev, "Msg NACKed for Slave %d\n", msg->dev_num);
 583                 return SDW_CMD_FAIL;
 584         }
 585
 586         if (no_ack) {
 587                 dev_dbg_ratelimited(cdns->dev, "Msg ignored for Slave %d\n", msg->dev_num);
 588                 return SDW_CMD_IGNORED;
 589         }
 590
 591         if (msg->flags == SDW_MSG_FLAG_READ) {
 592                 /* fill response */
 593                 for (i = 0; i < count; i++)
 594                         msg->buf[i + offset] = FIELD_GET(CDNS_MCP_RESP_RDATA,
 595                                                          cdns->response_buf[i]);
 596         }
 597
 598         return SDW_CMD_OK;
 599 }
 600
 601 static void cdns_read_response(struct sdw_cdns *cdns)
 602 {
 603         u32 num_resp, cmd_base;
 604         int i;
 605
 606         /* RX_FIFO_AVAIL can be 2 entries more than the FIFO size */
 607         BUILD_BUG_ON(ARRAY_SIZE(cdns->response_buf) < CDNS_MCP_CMD_LEN + 2);
 608
 609         num_resp = cdns_readl(cdns, CDNS_MCP_FIFOSTAT);
 610         num_resp &= CDNS_MCP_RX_FIFO_AVAIL;
 611         if (num_resp > ARRAY_SIZE(cdns->response_buf)) {
 612                 dev_warn(cdns->dev, "RX AVAIL %d too long\n", num_resp);
 613                 num_resp = ARRAY_SIZE(cdns->response_buf);
 614         }
 615
 616         cmd_base = CDNS_IP_MCP_CMD_BASE;
 617
 618         for (i = 0; i < num_resp; i++) {
 619                 cdns->response_buf[i] = cdns_ip_readl(cdns, cmd_base);
 620                 cmd_base += CDNS_MCP_CMD_WORD_LEN;
 621         }
 622 }
 623
 624 static enum sdw_command_response
 625 _cdns_xfer_msg(struct sdw_cdns *cdns, struct sdw_msg *msg, int cmd,
 626                int offset, int count, bool defer)
 627 {
 628         unsigned long time;
 629         u32 base, i, data;
 630         u16 addr;
 631
 632         /* Program the watermark level for RX FIFO */
 633         if (cdns->msg_count != count) {
 634                 cdns_writel(cdns, CDNS_MCP_FIFOLEVEL, count);
 635                 cdns->msg_count = count;
 636         }
 637
 638         base = CDNS_IP_MCP_CMD_BASE;
 639         addr = msg->addr + offset;
 640
 641         for (i = 0; i < count; i++) {
 642                 data = FIELD_PREP(CDNS_MCP_CMD_DEV_ADDR, msg->dev_num);
 643                 data |= FIELD_PREP(CDNS_MCP_CMD_COMMAND, cmd);
 644                 data |= FIELD_PREP(CDNS_MCP_CMD_REG_ADDR, addr);
 645                 addr++;
 646
 647                 if (msg->flags == SDW_MSG_FLAG_WRITE)
 648                         data |= msg->buf[i + offset];
 649
 650                 data |= FIELD_PREP(CDNS_MCP_CMD_SSP_TAG, msg->ssp_sync);
 651                 cdns_ip_writel(cdns, base, data);
 652                 base += CDNS_MCP_CMD_WORD_LEN;
 653         }
 654
 655         if (defer)
 656                 return SDW_CMD_OK;
 657
 658         /* wait for timeout or response */
 659         time = wait_for_completion_timeout(&cdns->tx_complete,
 660                                            msecs_to_jiffies(CDNS_TX_TIMEOUT));
 661         if (!time) {
 662                 dev_err(cdns->dev, "IO transfer timed out, cmd %d device %d addr %x len %d\n",
 663                         cmd, msg->dev_num, msg->addr, msg->len);
 664                 msg->len = 0;
 665
 666                 /* Drain anything in the RX_FIFO */
 667                 cdns_read_response(cdns);
 668
 669                 return SDW_CMD_TIMEOUT;
 670         }
 671
 672         return cdns_fill_msg_resp(cdns, msg, count, offset);
 673 }
 674
 675 static enum sdw_command_response
 676 cdns_program_scp_addr(struct sdw_cdns *cdns, struct sdw_msg *msg)
 677 {
 678         int nack = 0, no_ack = 0;
 679         unsigned long time;
 680         u32 data[2], base;
 681         int i;
 682
 683         /* Program the watermark level for RX FIFO */
 684         if (cdns->msg_count != CDNS_SCP_RX_FIFOLEVEL) {
 685                 cdns_writel(cdns, CDNS_MCP_FIFOLEVEL, CDNS_SCP_RX_FIFOLEVEL);
 686                 cdns->msg_count = CDNS_SCP_RX_FIFOLEVEL;
 687         }
 688
 689         data[0] = FIELD_PREP(CDNS_MCP_CMD_DEV_ADDR, msg->dev_num);
 690         data[0] |= FIELD_PREP(CDNS_MCP_CMD_COMMAND, 0x3);
 691         data[1] = data[0];
 692
 693         data[0] |= FIELD_PREP(CDNS_MCP_CMD_REG_ADDR, SDW_SCP_ADDRPAGE1);
 694         data[1] |= FIELD_PREP(CDNS_MCP_CMD_REG_ADDR, SDW_SCP_ADDRPAGE2);
 695
 696         data[0] |= msg->addr_page1;
 697         data[1] |= msg->addr_page2;
 698
 699         base = CDNS_IP_MCP_CMD_BASE;
 700         cdns_ip_writel(cdns, base, data[0]);
 701         base += CDNS_MCP_CMD_WORD_LEN;
 702         cdns_ip_writel(cdns, base, data[1]);
 703
 704         time = wait_for_completion_timeout(&cdns->tx_complete,
 705                                            msecs_to_jiffies(CDNS_TX_TIMEOUT));
 706         if (!time) {
 707                 dev_err(cdns->dev, "SCP Msg trf timed out\n");
 708                 msg->len = 0;
 709                 return SDW_CMD_TIMEOUT;
 710         }
 711
 712         /* check response the writes */
 713         for (i = 0; i < 2; i++) {
 714                 if (!(cdns->response_buf[i] & CDNS_MCP_RESP_ACK)) {
 715                         no_ack = 1;
 716                         dev_err(cdns->dev, "Program SCP Ack not received\n");
 717                         if (cdns->response_buf[i] & CDNS_MCP_RESP_NACK) {
 718                                 nack = 1;
 719                                 dev_err(cdns->dev, "Program SCP NACK received\n");
 720                         }
 721                 }
 722         }
 723
 724         /* For NACK, NO ack, don't return err if we are in Broadcast mode */
 725         if (nack) {
 726                 dev_err_ratelimited(cdns->dev,
 727                                     "SCP_addrpage NACKed for Slave %d\n", msg->dev_num);
 728                 return SDW_CMD_FAIL;
 729         }
 730
 731         if (no_ack) {
 732                 dev_dbg_ratelimited(cdns->dev,
 733                                     "SCP_addrpage ignored for Slave %d\n", msg->dev_num);
 734                 return SDW_CMD_IGNORED;
 735         }
 736
 737         return SDW_CMD_OK;
 738 }
 739
 740 static int cdns_prep_msg(struct sdw_cdns *cdns, struct sdw_msg *msg, int *cmd)
 741 {
 742         int ret;
 743
 744         if (msg->page) {
 745                 ret = cdns_program_scp_addr(cdns, msg);
 746                 if (ret) {
 747                         msg->len = 0;
 748                         return ret;
 749                 }
 750         }
 751
 752         switch (msg->flags) {
 753         case SDW_MSG_FLAG_READ:
 754                 *cmd = CDNS_MCP_CMD_READ;
 755                 break;
 756
 757         case SDW_MSG_FLAG_WRITE:
 758                 *cmd = CDNS_MCP_CMD_WRITE;
 759                 break;
 760
 761         default:
 762                 dev_err(cdns->dev, "Invalid msg cmd: %d\n", msg->flags);
 763                 return -EINVAL;
 764         }
 765
 766         return 0;
 767 }
 768
 769 enum sdw_command_response
 770 cdns_xfer_msg(struct sdw_bus *bus, struct sdw_msg *msg)
 771 {
 772         struct sdw_cdns *cdns = bus_to_cdns(bus);
 773         int cmd = 0, ret, i;
 774
 775         ret = cdns_prep_msg(cdns, msg, &cmd);
 776         if (ret)
 777                 return SDW_CMD_FAIL_OTHER;
 778
 779         for (i = 0; i < msg->len / CDNS_MCP_CMD_LEN; i++) {
 780                 ret = _cdns_xfer_msg(cdns, msg, cmd, i * CDNS_MCP_CMD_LEN,
 781                                      CDNS_MCP_CMD_LEN, false);
 782                 if (ret != SDW_CMD_OK)
 783                         return ret;
 784         }
 785
 786         if (!(msg->len % CDNS_MCP_CMD_LEN))
 787                 return SDW_CMD_OK;
 788
 789         return _cdns_xfer_msg(cdns, msg, cmd, i * CDNS_MCP_CMD_LEN,
 790                               msg->len % CDNS_MCP_CMD_LEN, false);
 791 }
 792 EXPORT_SYMBOL(cdns_xfer_msg);
 793
 794 enum sdw_command_response
 795 cdns_xfer_msg_defer(struct sdw_bus *bus)
 796 {
 797         struct sdw_cdns *cdns = bus_to_cdns(bus);
 798         struct sdw_defer *defer = &bus->defer_msg;
 799         struct sdw_msg *msg = defer->msg;
 800         int cmd = 0, ret;
 801
 802         /* for defer only 1 message is supported */
 803         if (msg->len > 1)
 804                 return -ENOTSUPP;
 805
 806         ret = cdns_prep_msg(cdns, msg, &cmd);
 807         if (ret)
 808                 return SDW_CMD_FAIL_OTHER;
 809
 810         return _cdns_xfer_msg(cdns, msg, cmd, 0, msg->len, true);
 811 }
 812 EXPORT_SYMBOL(cdns_xfer_msg_defer);
 813
 814 u32 cdns_read_ping_status(struct sdw_bus *bus)
 815 {
 816         struct sdw_cdns *cdns = bus_to_cdns(bus);
 817
 818         return cdns_readl(cdns, CDNS_MCP_SLAVE_STAT);
 819 }
 820 EXPORT_SYMBOL(cdns_read_ping_status);
 821
 822 /*
 823  * IRQ handling
 824  */
 825
 826 static int cdns_update_slave_status(struct sdw_cdns *cdns,
 827                                     u64 slave_intstat)
 828 {
 829         enum sdw_slave_status status[SDW_MAX_DEVICES + 1];
 830         bool is_slave = false;
 831         u32 mask;
 832         u32 val;
 833         int i, set_status;
 834
 835         memset(status, 0, sizeof(status));
 836
 837         for (i = 0; i <= SDW_MAX_DEVICES; i++) {
 838                 mask = (slave_intstat >> (i * CDNS_MCP_SLAVE_STATUS_NUM)) &
 839                         CDNS_MCP_SLAVE_STATUS_BITS;
 840
 841                 set_status = 0;
 842
 843                 if (mask) {
 844                         is_slave = true;
 845
 846                         if (mask & CDNS_MCP_SLAVE_INTSTAT_RESERVED) {
 847                                 status[i] = SDW_SLAVE_RESERVED;
 848                                 set_status++;
 849                         }
 850
 851                         if (mask & CDNS_MCP_SLAVE_INTSTAT_ATTACHED) {
 852                                 status[i] = SDW_SLAVE_ATTACHED;
 853                                 set_status++;
 854                         }
 855
 856                         if (mask & CDNS_MCP_SLAVE_INTSTAT_ALERT) {
 857                                 status[i] = SDW_SLAVE_ALERT;
 858                                 set_status++;
 859                         }
 860
 861                         if (mask & CDNS_MCP_SLAVE_INTSTAT_NPRESENT) {
 862                                 status[i] = SDW_SLAVE_UNATTACHED;
 863                                 set_status++;
 864                         }
 865                 }
 866
 867                 /*
 868                  * check that there was a single reported Slave status and when
 869                  * there is not use the latest status extracted from PING commands
 870                  */
 871                 if (set_status != 1) {
 872                         val = cdns_readl(cdns, CDNS_MCP_SLAVE_STAT);
 873                         val >>= (i * 2);
 874
 875                         switch (val & 0x3) {
 876                         case 0:
 877                                 status[i] = SDW_SLAVE_UNATTACHED;
 878                                 break;
 879                         case 1:
 880                                 status[i] = SDW_SLAVE_ATTACHED;
 881                                 break;
 882                         case 2:
 883                                 status[i] = SDW_SLAVE_ALERT;
 884                                 break;
 885                         case 3:
 886                         default:
 887                                 status[i] = SDW_SLAVE_RESERVED;
 888                                 break;
 889                         }
 890                 }
 891         }
 892
 893         if (is_slave) {
 894                 int ret;
 895
 896                 mutex_lock(&cdns->status_update_lock);
 897                 ret = sdw_handle_slave_status(&cdns->bus, status);
 898                 mutex_unlock(&cdns->status_update_lock);
 899                 return ret;
 900         }
 901
 902         return 0;
 903 }
 904
 905 /**
 906  * sdw_cdns_irq() - Cadence interrupt handler
 907  * @irq: irq number
 908  * @dev_id: irq context
 909  */
 910 irqreturn_t sdw_cdns_irq(int irq, void *dev_id)
 911 {
 912         struct sdw_cdns *cdns = dev_id;
 913         u32 int_status;
 914
 915         /* Check if the link is up */
 916         if (!cdns->link_up)
 917                 return IRQ_NONE;
 918
 919         int_status = cdns_readl(cdns, CDNS_MCP_INTSTAT);
 920
 921         /* check for reserved values read as zero */
 922         if (int_status & CDNS_MCP_INT_RESERVED)
 923                 return IRQ_NONE;
 924
 925         if (!(int_status & CDNS_MCP_INT_IRQ))
 926                 return IRQ_NONE;
 927
 928         if (int_status & CDNS_MCP_INT_RX_WL) {
 929                 struct sdw_bus *bus = &cdns->bus;
 930                 struct sdw_defer *defer = &bus->defer_msg;
 931
 932                 cdns_read_response(cdns);
 933
 934                 if (defer && defer->msg) {
 935                         cdns_fill_msg_resp(cdns, defer->msg,
 936                                            defer->length, 0);
 937                         complete(&defer->complete);
 938                 } else {
 939                         complete(&cdns->tx_complete);
 940                 }
 941         }
 942
 943         if (int_status & CDNS_MCP_INT_PARITY) {
 944                 /* Parity error detected by Master */
 945                 dev_err_ratelimited(cdns->dev, "Parity error\n");
 946         }
 947
 948         if (int_status & CDNS_MCP_INT_CTRL_CLASH) {
 949                 /* Slave is driving bit slot during control word */
 950                 dev_err_ratelimited(cdns->dev, "Bus clash for control word\n");
 951         }
 952
 953         if (int_status & CDNS_MCP_INT_DATA_CLASH) {
 954                 /*
 955                  * Multiple slaves trying to drive bit slot, or issue with
 956                  * ownership of data bits or Slave gone bonkers
 957                  */
 958                 dev_err_ratelimited(cdns->dev, "Bus clash for data word\n");
 959         }
 960
 961         if (cdns->bus.params.m_data_mode != SDW_PORT_DATA_MODE_NORMAL &&
 962             int_status & CDNS_MCP_INT_DPINT) {
 963                 u32 port_intstat;
 964
 965                 /* just log which ports report an error */
 966                 port_intstat = cdns_readl(cdns, CDNS_MCP_PORT_INTSTAT);
 967                 dev_err_ratelimited(cdns->dev, "DP interrupt: PortIntStat %8x\n",
 968                                     port_intstat);
 969
 970                 /* clear status w/ write1 */
 971                 cdns_writel(cdns, CDNS_MCP_PORT_INTSTAT, port_intstat);
 972         }
 973
 974         if (int_status & CDNS_MCP_INT_SLAVE_MASK) {
 975                 /* Mask the Slave interrupt and wake thread */
 976                 cdns_updatel(cdns, CDNS_MCP_INTMASK,
 977                              CDNS_MCP_INT_SLAVE_MASK, 0);
 978
 979                 int_status &= ~CDNS_MCP_INT_SLAVE_MASK;
 980
 981                 /*
 982                  * Deal with possible race condition between interrupt
 983                  * handling and disabling interrupts on suspend.
 984                  *
 985                  * If the master is in the process of disabling
 986                  * interrupts, don't schedule a workqueue
 987                  */
 988                 if (cdns->interrupt_enabled)
 989                         schedule_work(&cdns->work);
 990         }
 991
 992         cdns_writel(cdns, CDNS_MCP_INTSTAT, int_status);
 993         return IRQ_HANDLED;
 994 }
 995 EXPORT_SYMBOL(sdw_cdns_irq);
 996
 997 static void cdns_check_attached_status_dwork(struct work_struct *work)
 998 {
 999         struct sdw_cdns *cdns =
1000                 container_of(work, struct sdw_cdns, attach_dwork.work);
1001         enum sdw_slave_status status[SDW_MAX_DEVICES + 1];
1002         u32 val;
1003         int ret;
1004         int i;
1005
1006         val = cdns_readl(cdns, CDNS_MCP_SLAVE_STAT);
1007
1008         for (i = 0; i <= SDW_MAX_DEVICES; i++) {
1009                 status[i] = val & 0x3;
1010                 if (status[i])
1011                         dev_dbg(cdns->dev, "Peripheral %d status: %d\n", i, status[i]);
1012                 val >>= 2;
1013         }
1014
1015         mutex_lock(&cdns->status_update_lock);
1016         ret = sdw_handle_slave_status(&cdns->bus, status);
1017         mutex_unlock(&cdns->status_update_lock);
1018         if (ret < 0)
1019                 dev_err(cdns->dev, "%s: sdw_handle_slave_status failed: %d\n", __func__, ret);
1020 }
1021
1022 /**
1023  * cdns_update_slave_status_work - update slave status in a work since we will need to handle
1024  * other interrupts eg. CDNS_MCP_INT_RX_WL during the update slave
1025  * process.
1026  * @work: cdns worker thread
1027  */
1028 static void cdns_update_slave_status_work(struct work_struct *work)
1029 {
1030         struct sdw_cdns *cdns =
1031                 container_of(work, struct sdw_cdns, work);
1032         u32 slave0, slave1;
1033         u64 slave_intstat;
1034         u32 device0_status;
1035         int retry_count = 0;
1036
1037         /*
1038          * Clear main interrupt first so we don't lose any assertions
1039          * that happen during this function.
1040          */
1041         cdns_writel(cdns, CDNS_MCP_INTSTAT, CDNS_MCP_INT_SLAVE_MASK);
1042
1043         slave0 = cdns_readl(cdns, CDNS_MCP_SLAVE_INTSTAT0);
1044         slave1 = cdns_readl(cdns, CDNS_MCP_SLAVE_INTSTAT1);
1045
1046         /*
1047          * Clear the bits before handling so we don't lose any
1048          * bits that re-assert.
1049          */
1050         cdns_writel(cdns, CDNS_MCP_SLAVE_INTSTAT0, slave0);
1051         cdns_writel(cdns, CDNS_MCP_SLAVE_INTSTAT1, slave1);
1052
1053         /* combine the two status */
1054         slave_intstat = ((u64)slave1 << 32) | slave0;
1055
1056         dev_dbg_ratelimited(cdns->dev, "Slave status change: 0x%llx\n", slave_intstat);
1057
1058 update_status:
1059         cdns_update_slave_status(cdns, slave_intstat);
1060
1061         /*
1062          * When there is more than one peripheral per link, it's
1063          * possible that a deviceB becomes attached after we deal with
1064          * the attachment of deviceA. Since the hardware does a
1065          * logical AND, the attachment of the second device does not
1066          * change the status seen by the driver.
1067          *
1068          * In that case, clearing the registers above would result in
1069          * the deviceB never being detected - until a change of status
1070          * is observed on the bus.
1071          *
1072          * To avoid this race condition, re-check if any device0 needs
1073          * attention with PING commands. There is no need to check for
1074          * ALERTS since they are not allowed until a non-zero
1075          * device_number is assigned.
1076          *
1077          * Do not clear the INTSTAT0/1. While looping to enumerate devices on
1078          * #0 there could be status changes on other devices - these must
1079          * be kept in the INTSTAT so they can be handled when all #0 devices
1080          * have been handled.
1081          */
1082
1083         device0_status = cdns_readl(cdns, CDNS_MCP_SLAVE_STAT);
1084         device0_status &= 3;
1085
1086         if (device0_status == SDW_SLAVE_ATTACHED) {
1087                 if (retry_count++ < SDW_MAX_DEVICES) {
1088                         dev_dbg_ratelimited(cdns->dev,
1089                                             "Device0 detected after clearing status, iteration %d\n",
1090                                             retry_count);
1091                         slave_intstat = CDNS_MCP_SLAVE_INTSTAT_ATTACHED;
1092                         goto update_status;
1093                 } else {
1094                         dev_err_ratelimited(cdns->dev,
1095                                             "Device0 detected after %d iterations\n",
1096                                             retry_count);
1097                 }
1098         }
1099
1100         /* unmask Slave interrupt now */
1101         cdns_updatel(cdns, CDNS_MCP_INTMASK,
1102                      CDNS_MCP_INT_SLAVE_MASK, CDNS_MCP_INT_SLAVE_MASK);
1103
1104 }
1105
1106 /* paranoia check to make sure self-cleared bits are indeed cleared */
1107 void sdw_cdns_check_self_clearing_bits(struct sdw_cdns *cdns, const char *string,
1108                                        bool initial_delay, int reset_iterations)
1109 {
1110         u32 ip_mcp_control;
1111         u32 mcp_control;
1112         u32 mcp_config_update;
1113         int i;
1114
1115         if (initial_delay)
1116                 usleep_range(1000, 1500);
1117
1118         ip_mcp_control = cdns_ip_readl(cdns, CDNS_IP_MCP_CONTROL);
1119
1120         /* the following bits should be cleared immediately */
1121         if (ip_mcp_control & CDNS_IP_MCP_CONTROL_SW_RST)
1122                 dev_err(cdns->dev, "%s failed: IP_MCP_CONTROL_SW_RST is not cleared\n", string);
1123
1124         mcp_control = cdns_readl(cdns, CDNS_MCP_CONTROL);
1125
1126         /* the following bits should be cleared immediately */
1127         if (mcp_control & CDNS_MCP_CONTROL_CMD_RST)
1128                 dev_err(cdns->dev, "%s failed: MCP_CONTROL_CMD_RST is not cleared\n", string);
1129         if (mcp_control & CDNS_MCP_CONTROL_SOFT_RST)
1130                 dev_err(cdns->dev, "%s failed: MCP_CONTROL_SOFT_RST is not cleared\n", string);
1131         if (mcp_control & CDNS_MCP_CONTROL_CLK_STOP_CLR)
1132                 dev_err(cdns->dev, "%s failed: MCP_CONTROL_CLK_STOP_CLR is not cleared\n", string);
1133
1134         mcp_config_update = cdns_readl(cdns, CDNS_MCP_CONFIG_UPDATE);
1135         if (mcp_config_update & CDNS_MCP_CONFIG_UPDATE_BIT)
1136                 dev_err(cdns->dev, "%s failed: MCP_CONFIG_UPDATE_BIT is not cleared\n", string);
1137
1138         i = 0;
1139         while (mcp_control & CDNS_MCP_CONTROL_HW_RST) {
1140                 if (i == reset_iterations) {
1141                         dev_err(cdns->dev, "%s failed: MCP_CONTROL_HW_RST is not cleared\n", string);
1142                         break;
1143                 }
1144
1145                 dev_dbg(cdns->dev, "%s: MCP_CONTROL_HW_RST is not cleared at iteration %d\n", string, i);
1146                 i++;
1147
1148                 usleep_range(1000, 1500);
1149                 mcp_control = cdns_readl(cdns, CDNS_MCP_CONTROL);
1150         }
1151
1152 }
1153 EXPORT_SYMBOL(sdw_cdns_check_self_clearing_bits);
1154
1155 /*
1156  * init routines
1157  */
1158
1159 /**
1160  * sdw_cdns_exit_reset() - Program reset parameters and start bus operations
1161  * @cdns: Cadence instance
1162  */
1163 int sdw_cdns_exit_reset(struct sdw_cdns *cdns)
1164 {
1165         /* keep reset delay unchanged to 4096 cycles */
1166
1167         /* use hardware generated reset */
1168         cdns_updatel(cdns, CDNS_MCP_CONTROL,
1169                      CDNS_MCP_CONTROL_HW_RST,
1170                      CDNS_MCP_CONTROL_HW_RST);
1171
1172         /* commit changes */
1173         return cdns_config_update(cdns);
1174 }
1175 EXPORT_SYMBOL(sdw_cdns_exit_reset);
1176
1177 /**
1178  * cdns_enable_slave_interrupts() - Enable SDW slave interrupts
1179  * @cdns: Cadence instance
1180  * @state: boolean for true/false
1181  */
1182 static void cdns_enable_slave_interrupts(struct sdw_cdns *cdns, bool state)
1183 {
1184         u32 mask;
1185
1186         mask = cdns_readl(cdns, CDNS_MCP_INTMASK);
1187         if (state)
1188                 mask |= CDNS_MCP_INT_SLAVE_MASK;
1189         else
1190                 mask &= ~CDNS_MCP_INT_SLAVE_MASK;
1191
1192         cdns_writel(cdns, CDNS_MCP_INTMASK, mask);
1193 }
1194
1195 /**
1196  * sdw_cdns_enable_interrupt() - Enable SDW interrupts
1197  * @cdns: Cadence instance
1198  * @state: True if we are trying to enable interrupt.
1199  */
1200 int sdw_cdns_enable_interrupt(struct sdw_cdns *cdns, bool state)
1201 {
1202         u32 slave_intmask0 = 0;
1203         u32 slave_intmask1 = 0;
1204         u32 mask = 0;
1205
1206         if (!state)
1207                 goto update_masks;
1208
1209         slave_intmask0 = CDNS_MCP_SLAVE_INTMASK0_MASK;
1210         slave_intmask1 = CDNS_MCP_SLAVE_INTMASK1_MASK;
1211
1212         /* enable detection of all slave state changes */
1213         mask = CDNS_MCP_INT_SLAVE_MASK;
1214
1215         /* enable detection of bus issues */
1216         mask |= CDNS_MCP_INT_CTRL_CLASH | CDNS_MCP_INT_DATA_CLASH |
1217                 CDNS_MCP_INT_PARITY;
1218
1219         /* port interrupt limited to test modes for now */
1220         if (cdns->bus.params.m_data_mode != SDW_PORT_DATA_MODE_NORMAL)
1221                 mask |= CDNS_MCP_INT_DPINT;
1222
1223         /* enable detection of RX fifo level */
1224         mask |= CDNS_MCP_INT_RX_WL;
1225
1226         /*
1227          * CDNS_MCP_INT_IRQ needs to be set otherwise all previous
1228          * settings are irrelevant
1229          */
1230         mask |= CDNS_MCP_INT_IRQ;
1231
1232         if (interrupt_mask) /* parameter override */
1233                 mask = interrupt_mask;
1234
1235 update_masks:
1236         /* clear slave interrupt status before enabling interrupt */
1237         if (state) {
1238                 u32 slave_state;
1239
1240                 slave_state = cdns_readl(cdns, CDNS_MCP_SLAVE_INTSTAT0);
1241                 cdns_writel(cdns, CDNS_MCP_SLAVE_INTSTAT0, slave_state);
1242                 slave_state = cdns_readl(cdns, CDNS_MCP_SLAVE_INTSTAT1);
1243                 cdns_writel(cdns, CDNS_MCP_SLAVE_INTSTAT1, slave_state);
1244         }
1245         cdns->interrupt_enabled = state;
1246
1247         /*
1248          * Complete any on-going status updates before updating masks,
1249          * and cancel queued status updates.
1250          *
1251          * There could be a race with a new interrupt thrown before
1252          * the 3 mask updates below are complete, so in the interrupt
1253          * we use the 'interrupt_enabled' status to prevent new work
1254          * from being queued.
1255          */
1256         if (!state)
1257                 cancel_work_sync(&cdns->work);
1258
1259         cdns_writel(cdns, CDNS_MCP_SLAVE_INTMASK0, slave_intmask0);
1260         cdns_writel(cdns, CDNS_MCP_SLAVE_INTMASK1, slave_intmask1);
1261         cdns_writel(cdns, CDNS_MCP_INTMASK, mask);
1262
1263         return 0;
1264 }
1265 EXPORT_SYMBOL(sdw_cdns_enable_interrupt);
1266
1267 static int cdns_allocate_pdi(struct sdw_cdns *cdns,
1268                              struct sdw_cdns_pdi **stream,
1269                              u32 num)
1270 {
1271         struct sdw_cdns_pdi *pdi;
1272         int i;
1273
1274         if (!num)
1275                 return 0;
1276
1277         pdi = devm_kcalloc(cdns->dev, num, sizeof(*pdi), GFP_KERNEL);
1278         if (!pdi)
1279                 return -ENOMEM;
1280
1281         for (i = 0; i < num; i++) {
1282                 pdi[i].num = i;
1283         }
1284
1285         *stream = pdi;
1286         return 0;
1287 }
1288
1289 /**
1290  * sdw_cdns_pdi_init() - PDI initialization routine
1291  *
1292  * @cdns: Cadence instance
1293  * @config: Stream configurations
1294  */
1295 int sdw_cdns_pdi_init(struct sdw_cdns *cdns,
1296                       struct sdw_cdns_stream_config config)
1297 {
1298         struct sdw_cdns_streams *stream;
1299         int ret;
1300
1301         cdns->pcm.num_bd = config.pcm_bd;
1302         cdns->pcm.num_in = config.pcm_in;
1303         cdns->pcm.num_out = config.pcm_out;
1304
1305         /* Allocate PDIs for PCMs */
1306         stream = &cdns->pcm;
1307
1308         /* we allocate PDI0 and PDI1 which are used for Bulk */
1309         ret = cdns_allocate_pdi(cdns, &stream->bd, stream->num_bd);
1310         if (ret)
1311                 return ret;
1312
1313         ret = cdns_allocate_pdi(cdns, &stream->in, stream->num_in);
1314         if (ret)
1315                 return ret;
1316
1317         ret = cdns_allocate_pdi(cdns, &stream->out, stream->num_out);
1318         if (ret)
1319                 return ret;
1320
1321         /* Update total number of PCM PDIs */
1322         stream->num_pdi = stream->num_bd + stream->num_in + stream->num_out;
1323         cdns->num_ports = stream->num_pdi;
1324
1325         return 0;
1326 }
1327 EXPORT_SYMBOL(sdw_cdns_pdi_init);
1328
1329 static u32 cdns_set_initial_frame_shape(int n_rows, int n_cols)
1330 {
1331         u32 val;
1332         int c;
1333         int r;
1334
1335         r = sdw_find_row_index(n_rows);
1336         c = sdw_find_col_index(n_cols);
1337
1338         val = FIELD_PREP(CDNS_MCP_FRAME_SHAPE_ROW_MASK, r);
1339         val |= FIELD_PREP(CDNS_MCP_FRAME_SHAPE_COL_MASK, c);
1340
1341         return val;
1342 }
1343
1344 static void cdns_init_clock_ctrl(struct sdw_cdns *cdns)
1345 {
1346         struct sdw_bus *bus = &cdns->bus;
1347         struct sdw_master_prop *prop = &bus->prop;
1348         u32 val;
1349         u32 ssp_interval;
1350         int divider;
1351
1352         dev_dbg(cdns->dev, "mclk %d max %d row %d col %d\n",
1353                 prop->mclk_freq,
1354                 prop->max_clk_freq,
1355                 prop->default_row,
1356                 prop->default_col);
1357
1358         /* Set clock divider */
1359         divider = (prop->mclk_freq / prop->max_clk_freq) - 1;
1360
1361         cdns_updatel(cdns, CDNS_MCP_CLK_CTRL0,
1362                      CDNS_MCP_CLK_MCLKD_MASK, divider);
1363         cdns_updatel(cdns, CDNS_MCP_CLK_CTRL1,
1364                      CDNS_MCP_CLK_MCLKD_MASK, divider);
1365
1366         /*
1367          * Frame shape changes after initialization have to be done
1368          * with the bank switch mechanism
1369          */
1370         val = cdns_set_initial_frame_shape(prop->default_row,
1371                                            prop->default_col);
1372         cdns_writel(cdns, CDNS_MCP_FRAME_SHAPE_INIT, val);
1373
1374         /* Set SSP interval to default value */
1375         ssp_interval = prop->default_frame_rate / SDW_CADENCE_GSYNC_HZ;
1376         cdns_writel(cdns, CDNS_MCP_SSP_CTRL0, ssp_interval);
1377         cdns_writel(cdns, CDNS_MCP_SSP_CTRL1, ssp_interval);
1378 }
1379
1380 /**
1381  * sdw_cdns_soft_reset() - Cadence soft-reset
1382  * @cdns: Cadence instance
1383  */
1384 int sdw_cdns_soft_reset(struct sdw_cdns *cdns)
1385 {
1386         int ret;
1387
1388         cdns_updatel(cdns, CDNS_MCP_CONTROL, CDNS_MCP_CONTROL_SOFT_RST,
1389                      CDNS_MCP_CONTROL_SOFT_RST);
1390
1391         ret = cdns_config_update(cdns);
1392         if (ret < 0) {
1393                 dev_err(cdns->dev, "%s: config update failed\n", __func__);
1394                 return ret;
1395         }
1396
1397         ret = cdns_set_wait(cdns, CDNS_MCP_CONTROL, CDNS_MCP_CONTROL_SOFT_RST, 0);
1398         if (ret < 0)
1399                 dev_err(cdns->dev, "%s: Soft Reset timed out\n", __func__);
1400
1401         return ret;
1402 }
1403 EXPORT_SYMBOL(sdw_cdns_soft_reset);
1404
1405 /**
1406  * sdw_cdns_init() - Cadence initialization
1407  * @cdns: Cadence instance
1408  */
1409 int sdw_cdns_init(struct sdw_cdns *cdns)
1410 {
1411         u32 val;
1412
1413         cdns_init_clock_ctrl(cdns);
1414
1415         sdw_cdns_check_self_clearing_bits(cdns, __func__, false, 0);
1416
1417         /* reset msg_count to default value of FIFOLEVEL */
1418         cdns->msg_count = cdns_readl(cdns, CDNS_MCP_FIFOLEVEL);
1419
1420         /* flush command FIFOs */
1421         cdns_updatel(cdns, CDNS_MCP_CONTROL, CDNS_MCP_CONTROL_CMD_RST,
1422                      CDNS_MCP_CONTROL_CMD_RST);
1423
1424         /* Set cmd accept mode */
1425         cdns_ip_updatel(cdns, CDNS_IP_MCP_CONTROL, CDNS_IP_MCP_CONTROL_CMD_ACCEPT,
1426                         CDNS_IP_MCP_CONTROL_CMD_ACCEPT);
1427
1428         /* disable wakeup */
1429         cdns_ip_updatel(cdns, CDNS_IP_MCP_CONTROL,
1430                         CDNS_IP_MCP_CONTROL_BLOCK_WAKEUP,
1431                         0);
1432
1433         /* Configure mcp config */
1434         val = cdns_readl(cdns, CDNS_MCP_CONFIG);
1435
1436         /* Disable auto bus release */
1437         val &= ~CDNS_MCP_CONFIG_BUS_REL;
1438
1439         cdns_writel(cdns, CDNS_MCP_CONFIG, val);
1440
1441         /* Configure IP mcp config */
1442         val = cdns_ip_readl(cdns, CDNS_IP_MCP_CONFIG);
1443
1444         /* enable bus operations with clock and data */
1445         val &= ~CDNS_IP_MCP_CONFIG_OP;
1446         val |= CDNS_IP_MCP_CONFIG_OP_NORMAL;
1447
1448         /* Set cmd mode for Tx and Rx cmds */
1449         val &= ~CDNS_IP_MCP_CONFIG_CMD;
1450
1451         /* Disable sniffer mode */
1452         val &= ~CDNS_IP_MCP_CONFIG_SNIFFER;
1453
1454         if (cdns->bus.multi_link)
1455                 /* Set Multi-master mode to take gsync into account */
1456                 val |= CDNS_IP_MCP_CONFIG_MMASTER;
1457
1458         /* leave frame delay to hardware default of 0x1F */
1459
1460         /* leave command retry to hardware default of 0 */
1461
1462         cdns_ip_writel(cdns, CDNS_IP_MCP_CONFIG, val);
1463
1464         /* changes will be committed later */
1465         return 0;
1466 }
1467 EXPORT_SYMBOL(sdw_cdns_init);
1468
1469 int cdns_bus_conf(struct sdw_bus *bus, struct sdw_bus_params *params)
1470 {
1471         struct sdw_master_prop *prop = &bus->prop;
1472         struct sdw_cdns *cdns = bus_to_cdns(bus);
1473         int mcp_clkctrl_off;
1474         int divider;
1475
1476         if (!params->curr_dr_freq) {
1477                 dev_err(cdns->dev, "NULL curr_dr_freq\n");
1478                 return -EINVAL;
1479         }
1480
1481         divider = prop->mclk_freq * SDW_DOUBLE_RATE_FACTOR /
1482                 params->curr_dr_freq;
1483         divider--; /* divider is 1/(N+1) */
1484
1485         if (params->next_bank)
1486                 mcp_clkctrl_off = CDNS_MCP_CLK_CTRL1;
1487         else
1488                 mcp_clkctrl_off = CDNS_MCP_CLK_CTRL0;
1489
1490         cdns_updatel(cdns, mcp_clkctrl_off, CDNS_MCP_CLK_MCLKD_MASK, divider);
1491
1492         return 0;
1493 }
1494 EXPORT_SYMBOL(cdns_bus_conf);
1495
1496 static int cdns_port_params(struct sdw_bus *bus,
1497                             struct sdw_port_params *p_params, unsigned int bank)
1498 {
1499         struct sdw_cdns *cdns = bus_to_cdns(bus);
1500         int dpn_config_off_source;
1501         int dpn_config_off_target;
1502         int target_num = p_params->num;
1503         int source_num = p_params->num;
1504         bool override = false;
1505         int dpn_config;
1506
1507         if (target_num == cdns->pdi_loopback_target &&
1508             cdns->pdi_loopback_source != -1) {
1509                 source_num = cdns->pdi_loopback_source;
1510                 override = true;
1511         }
1512
1513         if (bank) {
1514                 dpn_config_off_source = CDNS_DPN_B1_CONFIG(source_num);
1515                 dpn_config_off_target = CDNS_DPN_B1_CONFIG(target_num);
1516         } else {
1517                 dpn_config_off_source = CDNS_DPN_B0_CONFIG(source_num);
1518                 dpn_config_off_target = CDNS_DPN_B0_CONFIG(target_num);
1519         }
1520
1521         dpn_config = cdns_readl(cdns, dpn_config_off_source);
1522
1523         /* use port params if there is no loopback, otherwise use source as is */
1524         if (!override) {
1525                 u32p_replace_bits(&dpn_config, p_params->bps - 1, CDNS_DPN_CONFIG_WL);
1526                 u32p_replace_bits(&dpn_config, p_params->flow_mode, CDNS_DPN_CONFIG_PORT_FLOW);
1527                 u32p_replace_bits(&dpn_config, p_params->data_mode, CDNS_DPN_CONFIG_PORT_DAT);
1528         }
1529
1530         cdns_writel(cdns, dpn_config_off_target, dpn_config);
1531
1532         return 0;
1533 }
1534
1535 static int cdns_transport_params(struct sdw_bus *bus,
1536                                  struct sdw_transport_params *t_params,
1537                                  enum sdw_reg_bank bank)
1538 {
1539         struct sdw_cdns *cdns = bus_to_cdns(bus);
1540         int dpn_config;
1541         int dpn_config_off_source;
1542         int dpn_config_off_target;
1543         int dpn_hctrl;
1544         int dpn_hctrl_off_source;
1545         int dpn_hctrl_off_target;
1546         int dpn_offsetctrl;
1547         int dpn_offsetctrl_off_source;
1548         int dpn_offsetctrl_off_target;
1549         int dpn_samplectrl;
1550         int dpn_samplectrl_off_source;
1551         int dpn_samplectrl_off_target;
1552         int source_num = t_params->port_num;
1553         int target_num = t_params->port_num;
1554         bool override = false;
1555
1556         if (target_num == cdns->pdi_loopback_target &&
1557             cdns->pdi_loopback_source != -1) {
1558                 source_num = cdns->pdi_loopback_source;
1559                 override = true;
1560         }
1561
1562         /*
1563          * Note: Only full data port is supported on the Master side for
1564          * both PCM and PDM ports.
1565          */
1566
1567         if (bank) {
1568                 dpn_config_off_source = CDNS_DPN_B1_CONFIG(source_num);
1569                 dpn_hctrl_off_source = CDNS_DPN_B1_HCTRL(source_num);
1570                 dpn_offsetctrl_off_source = CDNS_DPN_B1_OFFSET_CTRL(source_num);
1571                 dpn_samplectrl_off_source = CDNS_DPN_B1_SAMPLE_CTRL(source_num);
1572
1573                 dpn_config_off_target = CDNS_DPN_B1_CONFIG(target_num);
1574                 dpn_hctrl_off_target = CDNS_DPN_B1_HCTRL(target_num);
1575                 dpn_offsetctrl_off_target = CDNS_DPN_B1_OFFSET_CTRL(target_num);
1576                 dpn_samplectrl_off_target = CDNS_DPN_B1_SAMPLE_CTRL(target_num);
1577
1578         } else {
1579                 dpn_config_off_source = CDNS_DPN_B0_CONFIG(source_num);
1580                 dpn_hctrl_off_source = CDNS_DPN_B0_HCTRL(source_num);
1581                 dpn_offsetctrl_off_source = CDNS_DPN_B0_OFFSET_CTRL(source_num);
1582                 dpn_samplectrl_off_source = CDNS_DPN_B0_SAMPLE_CTRL(source_num);
1583
1584                 dpn_config_off_target = CDNS_DPN_B0_CONFIG(target_num);
1585                 dpn_hctrl_off_target = CDNS_DPN_B0_HCTRL(target_num);
1586                 dpn_offsetctrl_off_target = CDNS_DPN_B0_OFFSET_CTRL(target_num);
1587                 dpn_samplectrl_off_target = CDNS_DPN_B0_SAMPLE_CTRL(target_num);
1588         }
1589
1590         dpn_config = cdns_readl(cdns, dpn_config_off_source);
1591         if (!override) {
1592                 u32p_replace_bits(&dpn_config, t_params->blk_grp_ctrl, CDNS_DPN_CONFIG_BGC);
1593                 u32p_replace_bits(&dpn_config, t_params->blk_pkg_mode, CDNS_DPN_CONFIG_BPM);
1594         }
1595         cdns_writel(cdns, dpn_config_off_target, dpn_config);
1596
1597         if (!override) {
1598                 dpn_offsetctrl = 0;
1599                 u32p_replace_bits(&dpn_offsetctrl, t_params->offset1, CDNS_DPN_OFFSET_CTRL_1);
1600                 u32p_replace_bits(&dpn_offsetctrl, t_params->offset2, CDNS_DPN_OFFSET_CTRL_2);
1601         } else {
1602                 dpn_offsetctrl = cdns_readl(cdns, dpn_offsetctrl_off_source);
1603         }
1604         cdns_writel(cdns, dpn_offsetctrl_off_target,  dpn_offsetctrl);
1605
1606         if (!override) {
1607                 dpn_hctrl = 0;
1608                 u32p_replace_bits(&dpn_hctrl, t_params->hstart, CDNS_DPN_HCTRL_HSTART);
1609                 u32p_replace_bits(&dpn_hctrl, t_params->hstop, CDNS_DPN_HCTRL_HSTOP);
1610                 u32p_replace_bits(&dpn_hctrl, t_params->lane_ctrl, CDNS_DPN_HCTRL_LCTRL);
1611         } else {
1612                 dpn_hctrl = cdns_readl(cdns, dpn_hctrl_off_source);
1613         }
1614         cdns_writel(cdns, dpn_hctrl_off_target, dpn_hctrl);
1615
1616         if (!override)
1617                 dpn_samplectrl = t_params->sample_interval - 1;
1618         else
1619                 dpn_samplectrl = cdns_readl(cdns, dpn_samplectrl_off_source);
1620         cdns_writel(cdns, dpn_samplectrl_off_target, dpn_samplectrl);
1621
1622         return 0;
1623 }
1624
1625 static int cdns_port_enable(struct sdw_bus *bus,
1626                             struct sdw_enable_ch *enable_ch, unsigned int bank)
1627 {
1628         struct sdw_cdns *cdns = bus_to_cdns(bus);
1629         int dpn_chnen_off, ch_mask;
1630
1631         if (bank)
1632                 dpn_chnen_off = CDNS_DPN_B1_CH_EN(enable_ch->port_num);
1633         else
1634                 dpn_chnen_off = CDNS_DPN_B0_CH_EN(enable_ch->port_num);
1635
1636         ch_mask = enable_ch->ch_mask * enable_ch->enable;
1637         cdns_writel(cdns, dpn_chnen_off, ch_mask);
1638
1639         return 0;
1640 }
1641
1642 static const struct sdw_master_port_ops cdns_port_ops = {
1643         .dpn_set_port_params = cdns_port_params,
1644         .dpn_set_port_transport_params = cdns_transport_params,
1645         .dpn_port_enable_ch = cdns_port_enable,
1646 };
1647
1648 /**
1649  * sdw_cdns_is_clock_stop: Check clock status
1650  *
1651  * @cdns: Cadence instance
1652  */
1653 bool sdw_cdns_is_clock_stop(struct sdw_cdns *cdns)
1654 {
1655         return !!(cdns_readl(cdns, CDNS_MCP_STAT) & CDNS_MCP_STAT_CLK_STOP);
1656 }
1657 EXPORT_SYMBOL(sdw_cdns_is_clock_stop);
1658
1659 /**
1660  * sdw_cdns_clock_stop: Cadence clock stop configuration routine
1661  *
1662  * @cdns: Cadence instance
1663  * @block_wake: prevent wakes if required by the platform
1664  */
1665 int sdw_cdns_clock_stop(struct sdw_cdns *cdns, bool block_wake)
1666 {
1667         bool slave_present = false;
1668         struct sdw_slave *slave;
1669         int ret;
1670
1671         sdw_cdns_check_self_clearing_bits(cdns, __func__, false, 0);
1672
1673         /* Check suspend status */
1674         if (sdw_cdns_is_clock_stop(cdns)) {
1675                 dev_dbg(cdns->dev, "Clock is already stopped\n");
1676                 return 0;
1677         }
1678
1679         /*
1680          * Before entering clock stop we mask the Slave
1681          * interrupts. This helps avoid having to deal with e.g. a
1682          * Slave becoming UNATTACHED while the clock is being stopped
1683          */
1684         cdns_enable_slave_interrupts(cdns, false);
1685
1686         /*
1687          * For specific platforms, it is required to be able to put
1688          * master into a state in which it ignores wake-up trials
1689          * in clock stop state
1690          */
1691         if (block_wake)
1692                 cdns_ip_updatel(cdns, CDNS_IP_MCP_CONTROL,
1693                                 CDNS_IP_MCP_CONTROL_BLOCK_WAKEUP,
1694                                 CDNS_IP_MCP_CONTROL_BLOCK_WAKEUP);
1695
1696         list_for_each_entry(slave, &cdns->bus.slaves, node) {
1697                 if (slave->status == SDW_SLAVE_ATTACHED ||
1698                     slave->status == SDW_SLAVE_ALERT) {
1699                         slave_present = true;
1700                         break;
1701                 }
1702         }
1703
1704         /* commit changes */
1705         ret = cdns_config_update(cdns);
1706         if (ret < 0) {
1707                 dev_err(cdns->dev, "%s: config_update failed\n", __func__);
1708                 return ret;
1709         }
1710
1711         /* Prepare slaves for clock stop */
1712         if (slave_present) {
1713                 ret = sdw_bus_prep_clk_stop(&cdns->bus);
1714                 if (ret < 0 && ret != -ENODATA) {
1715                         dev_err(cdns->dev, "prepare clock stop failed %d\n", ret);
1716                         return ret;
1717                 }
1718         }
1719
1720         /*
1721          * Enter clock stop mode and only report errors if there are
1722          * Slave devices present (ALERT or ATTACHED)
1723          */
1724         ret = sdw_bus_clk_stop(&cdns->bus);
1725         if (ret < 0 && slave_present && ret != -ENODATA) {
1726                 dev_err(cdns->dev, "bus clock stop failed %d\n", ret);
1727                 return ret;
1728         }
1729
1730         ret = cdns_set_wait(cdns, CDNS_MCP_STAT,
1731                             CDNS_MCP_STAT_CLK_STOP,
1732                             CDNS_MCP_STAT_CLK_STOP);
1733         if (ret < 0)
1734                 dev_err(cdns->dev, "Clock stop failed %d\n", ret);
1735
1736         return ret;
1737 }
1738 EXPORT_SYMBOL(sdw_cdns_clock_stop);
1739
1740 /**
1741  * sdw_cdns_clock_restart: Cadence PM clock restart configuration routine
1742  *
1743  * @cdns: Cadence instance
1744  * @bus_reset: context may be lost while in low power modes and the bus
1745  * may require a Severe Reset and re-enumeration after a wake.
1746  */
1747 int sdw_cdns_clock_restart(struct sdw_cdns *cdns, bool bus_reset)
1748 {
1749         int ret;
1750
1751         /* unmask Slave interrupts that were masked when stopping the clock */
1752         cdns_enable_slave_interrupts(cdns, true);
1753
1754         ret = cdns_clear_bit(cdns, CDNS_MCP_CONTROL,
1755                              CDNS_MCP_CONTROL_CLK_STOP_CLR);
1756         if (ret < 0) {
1757                 dev_err(cdns->dev, "Couldn't exit from clock stop\n");
1758                 return ret;
1759         }
1760
1761         ret = cdns_set_wait(cdns, CDNS_MCP_STAT, CDNS_MCP_STAT_CLK_STOP, 0);
1762         if (ret < 0) {
1763                 dev_err(cdns->dev, "clock stop exit failed %d\n", ret);
1764                 return ret;
1765         }
1766
1767         cdns_ip_updatel(cdns, CDNS_IP_MCP_CONTROL,
1768                         CDNS_IP_MCP_CONTROL_BLOCK_WAKEUP, 0);
1769
1770         cdns_ip_updatel(cdns, CDNS_IP_MCP_CONTROL, CDNS_IP_MCP_CONTROL_CMD_ACCEPT,
1771                         CDNS_IP_MCP_CONTROL_CMD_ACCEPT);
1772
1773         if (!bus_reset) {
1774
1775                 /* enable bus operations with clock and data */
1776                 cdns_ip_updatel(cdns, CDNS_IP_MCP_CONFIG,
1777                                 CDNS_IP_MCP_CONFIG_OP,
1778                                 CDNS_IP_MCP_CONFIG_OP_NORMAL);
1779
1780                 ret = cdns_config_update(cdns);
1781                 if (ret < 0) {
1782                         dev_err(cdns->dev, "%s: config_update failed\n", __func__);
1783                         return ret;
1784                 }
1785
1786                 ret = sdw_bus_exit_clk_stop(&cdns->bus);
1787                 if (ret < 0)
1788                         dev_err(cdns->dev, "bus failed to exit clock stop %d\n", ret);
1789         }
1790
1791         return ret;
1792 }
1793 EXPORT_SYMBOL(sdw_cdns_clock_restart);
1794
1795 /**
1796  * sdw_cdns_probe() - Cadence probe routine
1797  * @cdns: Cadence instance
1798  */
1799 int sdw_cdns_probe(struct sdw_cdns *cdns)
1800 {
1801         init_completion(&cdns->tx_complete);
1802         cdns->bus.port_ops = &cdns_port_ops;
1803
1804         mutex_init(&cdns->status_update_lock);
1805
1806         INIT_WORK(&cdns->work, cdns_update_slave_status_work);
1807         INIT_DELAYED_WORK(&cdns->attach_dwork, cdns_check_attached_status_dwork);
1808
1809         return 0;
1810 }
1811 EXPORT_SYMBOL(sdw_cdns_probe);
1812
1813 int cdns_set_sdw_stream(struct snd_soc_dai *dai,
1814                         void *stream, int direction)
1815 {
1816         struct sdw_cdns *cdns = snd_soc_dai_get_drvdata(dai);
1817         struct sdw_cdns_dai_runtime *dai_runtime;
1818
1819         dai_runtime = cdns->dai_runtime_array[dai->id];
1820
1821         if (stream) {
1822                 /* first paranoia check */
1823                 if (dai_runtime) {
1824                         dev_err(dai->dev,
1825                                 "dai_runtime already allocated for dai %s\n",
1826                                 dai->name);
1827                         return -EINVAL;
1828                 }
1829
1830                 /* allocate and set dai_runtime info */
1831                 dai_runtime = kzalloc(sizeof(*dai_runtime), GFP_KERNEL);
1832                 if (!dai_runtime)
1833                         return -ENOMEM;
1834
1835                 dai_runtime->stream_type = SDW_STREAM_PCM;
1836
1837                 dai_runtime->bus = &cdns->bus;
1838                 dai_runtime->link_id = cdns->instance;
1839
1840                 dai_runtime->stream = stream;
1841                 dai_runtime->direction = direction;
1842
1843                 cdns->dai_runtime_array[dai->id] = dai_runtime;
1844         } else {
1845                 /* second paranoia check */
1846                 if (!dai_runtime) {
1847                         dev_err(dai->dev,
1848                                 "dai_runtime not allocated for dai %s\n",
1849                                 dai->name);
1850                         return -EINVAL;
1851                 }
1852
1853                 /* for NULL stream we release allocated dai_runtime */
1854                 kfree(dai_runtime);
1855                 cdns->dai_runtime_array[dai->id] = NULL;
1856         }
1857         return 0;
1858 }
1859 EXPORT_SYMBOL(cdns_set_sdw_stream);
1860
1861 /**
1862  * cdns_find_pdi() - Find a free PDI
1863  *
1864  * @cdns: Cadence instance
1865  * @num: Number of PDIs
1866  * @pdi: PDI instances
1867  * @dai_id: DAI id
1868  *
1869  * Find a PDI for a given PDI array. The PDI num and dai_id are
1870  * expected to match, return NULL otherwise.
1871  */
1872 static struct sdw_cdns_pdi *cdns_find_pdi(struct sdw_cdns *cdns,
1873                                           unsigned int num,
1874                                           struct sdw_cdns_pdi *pdi,
1875                                           int dai_id)
1876 {
1877         int i;
1878
1879         for (i = 0; i < num; i++)
1880                 if (pdi[i].num == dai_id)
1881                         return &pdi[i];
1882
1883         return NULL;
1884 }
1885
1886 /**
1887  * sdw_cdns_config_stream: Configure a stream
1888  *
1889  * @cdns: Cadence instance
1890  * @ch: Channel count
1891  * @dir: Data direction
1892  * @pdi: PDI to be used
1893  */
1894 void sdw_cdns_config_stream(struct sdw_cdns *cdns,
1895                             u32 ch, u32 dir, struct sdw_cdns_pdi *pdi)
1896 {
1897         u32 offset, val = 0;
1898
1899         if (dir == SDW_DATA_DIR_RX) {
1900                 val = CDNS_PORTCTRL_DIRN;
1901
1902                 if (cdns->bus.params.m_data_mode != SDW_PORT_DATA_MODE_NORMAL)
1903                         val |= CDNS_PORTCTRL_TEST_FAILED;
1904         }
1905         offset = CDNS_PORTCTRL + pdi->num * CDNS_PORT_OFFSET;
1906         cdns_updatel(cdns, offset,
1907                      CDNS_PORTCTRL_DIRN | CDNS_PORTCTRL_TEST_FAILED,
1908                      val);
1909
1910         val = pdi->num;
1911         val |= CDNS_PDI_CONFIG_SOFT_RESET;
1912         val |= FIELD_PREP(CDNS_PDI_CONFIG_CHANNEL, (1 << ch) - 1);
1913         cdns_writel(cdns, CDNS_PDI_CONFIG(pdi->num), val);
1914 }
1915 EXPORT_SYMBOL(sdw_cdns_config_stream);
1916
1917 /**
1918  * sdw_cdns_alloc_pdi() - Allocate a PDI
1919  *
1920  * @cdns: Cadence instance
1921  * @stream: Stream to be allocated
1922  * @ch: Channel count
1923  * @dir: Data direction
1924  * @dai_id: DAI id
1925  */
1926 struct sdw_cdns_pdi *sdw_cdns_alloc_pdi(struct sdw_cdns *cdns,
1927                                         struct sdw_cdns_streams *stream,
1928                                         u32 ch, u32 dir, int dai_id)
1929 {
1930         struct sdw_cdns_pdi *pdi = NULL;
1931
1932         if (dir == SDW_DATA_DIR_RX)
1933                 pdi = cdns_find_pdi(cdns, stream->num_in, stream->in,
1934                                     dai_id);
1935         else
1936                 pdi = cdns_find_pdi(cdns, stream->num_out, stream->out,
1937                                     dai_id);
1938
1939         /* check if we found a PDI, else find in bi-directional */
1940         if (!pdi)
1941                 pdi = cdns_find_pdi(cdns, stream->num_bd, stream->bd,
1942                                     dai_id);
1943
1944         if (pdi) {
1945                 pdi->l_ch_num = 0;
1946                 pdi->h_ch_num = ch - 1;
1947                 pdi->dir = dir;
1948                 pdi->ch_count = ch;
1949         }
1950
1951         return pdi;
1952 }
1953 EXPORT_SYMBOL(sdw_cdns_alloc_pdi);
1954
1955 MODULE_LICENSE("Dual BSD/GPL");
1956 MODULE_DESCRIPTION("Cadence Soundwire Library");