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/soundwire/sdw_registers.h>
  17 #include <linux/soundwire/sdw.h>
  18 #include <sound/pcm_params.h>
  19 #include <sound/soc.h>
  20 #include "bus.h"
  21 #include "cadence_master.h"
  22
  23 static int interrupt_mask;
  24 module_param_named(cnds_mcp_int_mask, interrupt_mask, int, 0444);
  25 MODULE_PARM_DESC(cdns_mcp_int_mask, "Cadence MCP IntMask");
  26
  27 #define CDNS_MCP_CONFIG                         0x0
  28
  29 #define CDNS_MCP_CONFIG_MCMD_RETRY              GENMASK(27, 24)
  30 #define CDNS_MCP_CONFIG_MPREQ_DELAY             GENMASK(20, 16)
  31 #define CDNS_MCP_CONFIG_MMASTER                 BIT(7)
  32 #define CDNS_MCP_CONFIG_BUS_REL                 BIT(6)
  33 #define CDNS_MCP_CONFIG_SNIFFER                 BIT(5)
  34 #define CDNS_MCP_CONFIG_SSPMOD                  BIT(4)
  35 #define CDNS_MCP_CONFIG_CMD                     BIT(3)
  36 #define CDNS_MCP_CONFIG_OP                      GENMASK(2, 0)
  37 #define CDNS_MCP_CONFIG_OP_NORMAL               0
  38
  39 #define CDNS_MCP_CONTROL                        0x4
  40
  41 #define CDNS_MCP_CONTROL_RST_DELAY              GENMASK(10, 8)
  42 #define CDNS_MCP_CONTROL_CMD_RST                BIT(7)
  43 #define CDNS_MCP_CONTROL_SOFT_RST               BIT(6)
  44 #define CDNS_MCP_CONTROL_SW_RST                 BIT(5)
  45 #define CDNS_MCP_CONTROL_HW_RST                 BIT(4)
  46 #define CDNS_MCP_CONTROL_CLK_PAUSE              BIT(3)
  47 #define CDNS_MCP_CONTROL_CLK_STOP_CLR           BIT(2)
  48 #define CDNS_MCP_CONTROL_CMD_ACCEPT             BIT(1)
  49 #define CDNS_MCP_CONTROL_BLOCK_WAKEUP           BIT(0)
  50
  51 #define CDNS_MCP_CMDCTRL                        0x8
  52 #define CDNS_MCP_SSPSTAT                        0xC
  53 #define CDNS_MCP_FRAME_SHAPE                    0x10
  54 #define CDNS_MCP_FRAME_SHAPE_INIT               0x14
  55 #define CDNS_MCP_FRAME_SHAPE_COL_MASK           GENMASK(2, 0)
  56 #define CDNS_MCP_FRAME_SHAPE_ROW_OFFSET         3
  57
  58 #define CDNS_MCP_CONFIG_UPDATE                  0x18
  59 #define CDNS_MCP_CONFIG_UPDATE_BIT              BIT(0)
  60
  61 #define CDNS_MCP_PHYCTRL                        0x1C
  62 #define CDNS_MCP_SSP_CTRL0                      0x20
  63 #define CDNS_MCP_SSP_CTRL1                      0x28
  64 #define CDNS_MCP_CLK_CTRL0                      0x30
  65 #define CDNS_MCP_CLK_CTRL1                      0x38
  66 #define CDNS_MCP_CLK_MCLKD_MASK         GENMASK(7, 0)
  67
  68 #define CDNS_MCP_STAT                           0x40
  69
  70 #define CDNS_MCP_STAT_ACTIVE_BANK               BIT(20)
  71 #define CDNS_MCP_STAT_CLK_STOP                  BIT(16)
  72
  73 #define CDNS_MCP_INTSTAT                        0x44
  74 #define CDNS_MCP_INTMASK                        0x48
  75
  76 #define CDNS_MCP_INT_IRQ                        BIT(31)
  77 #define CDNS_MCP_INT_RESERVED1                  GENMASK(30, 17)
  78 #define CDNS_MCP_INT_WAKEUP                     BIT(16)
  79 #define CDNS_MCP_INT_SLAVE_RSVD                 BIT(15)
  80 #define CDNS_MCP_INT_SLAVE_ALERT                BIT(14)
  81 #define CDNS_MCP_INT_SLAVE_ATTACH               BIT(13)
  82 #define CDNS_MCP_INT_SLAVE_NATTACH              BIT(12)
  83 #define CDNS_MCP_INT_SLAVE_MASK                 GENMASK(15, 12)
  84 #define CDNS_MCP_INT_DPINT                      BIT(11)
  85 #define CDNS_MCP_INT_CTRL_CLASH                 BIT(10)
  86 #define CDNS_MCP_INT_DATA_CLASH                 BIT(9)
  87 #define CDNS_MCP_INT_PARITY                     BIT(8)
  88 #define CDNS_MCP_INT_CMD_ERR                    BIT(7)
  89 #define CDNS_MCP_INT_RESERVED2                  GENMASK(6, 4)
  90 #define CDNS_MCP_INT_RX_NE                      BIT(3)
  91 #define CDNS_MCP_INT_RX_WL                      BIT(2)
  92 #define CDNS_MCP_INT_TXE                        BIT(1)
  93 #define CDNS_MCP_INT_TXF                        BIT(0)
  94 #define CDNS_MCP_INT_RESERVED (CDNS_MCP_INT_RESERVED1 | CDNS_MCP_INT_RESERVED2)
  95
  96 #define CDNS_MCP_INTSET                         0x4C
  97
  98 #define CDNS_MCP_SLAVE_STAT                     0x50
  99 #define CDNS_MCP_SLAVE_STAT_MASK                GENMASK(1, 0)
 100
 101 #define CDNS_MCP_SLAVE_INTSTAT0                 0x54
 102 #define CDNS_MCP_SLAVE_INTSTAT1                 0x58
 103 #define CDNS_MCP_SLAVE_INTSTAT_NPRESENT         BIT(0)
 104 #define CDNS_MCP_SLAVE_INTSTAT_ATTACHED         BIT(1)
 105 #define CDNS_MCP_SLAVE_INTSTAT_ALERT            BIT(2)
 106 #define CDNS_MCP_SLAVE_INTSTAT_RESERVED         BIT(3)
 107 #define CDNS_MCP_SLAVE_STATUS_BITS              GENMASK(3, 0)
 108 #define CDNS_MCP_SLAVE_STATUS_NUM               4
 109
 110 #define CDNS_MCP_SLAVE_INTMASK0                 0x5C
 111 #define CDNS_MCP_SLAVE_INTMASK1                 0x60
 112
 113 #define CDNS_MCP_SLAVE_INTMASK0_MASK            GENMASK(31, 0)
 114 #define CDNS_MCP_SLAVE_INTMASK1_MASK            GENMASK(15, 0)
 115
 116 #define CDNS_MCP_PORT_INTSTAT                   0x64
 117 #define CDNS_MCP_PDI_STAT                       0x6C
 118
 119 #define CDNS_MCP_FIFOLEVEL                      0x78
 120 #define CDNS_MCP_FIFOSTAT                       0x7C
 121 #define CDNS_MCP_RX_FIFO_AVAIL                  GENMASK(5, 0)
 122
 123 #define CDNS_MCP_CMD_BASE                       0x80
 124 #define CDNS_MCP_RESP_BASE                      0x80
 125 #define CDNS_MCP_CMD_LEN                        0x20
 126 #define CDNS_MCP_CMD_WORD_LEN                   0x4
 127
 128 #define CDNS_MCP_CMD_SSP_TAG                    BIT(31)
 129 #define CDNS_MCP_CMD_COMMAND                    GENMASK(30, 28)
 130 #define CDNS_MCP_CMD_DEV_ADDR                   GENMASK(27, 24)
 131 #define CDNS_MCP_CMD_REG_ADDR_H                 GENMASK(23, 16)
 132 #define CDNS_MCP_CMD_REG_ADDR_L                 GENMASK(15, 8)
 133 #define CDNS_MCP_CMD_REG_DATA                   GENMASK(7, 0)
 134
 135 #define CDNS_MCP_CMD_READ                       2
 136 #define CDNS_MCP_CMD_WRITE                      3
 137
 138 #define CDNS_MCP_RESP_RDATA                     GENMASK(15, 8)
 139 #define CDNS_MCP_RESP_ACK                       BIT(0)
 140 #define CDNS_MCP_RESP_NACK                      BIT(1)
 141
 142 #define CDNS_DP_SIZE                            128
 143
 144 #define CDNS_DPN_B0_CONFIG(n)                   (0x100 + CDNS_DP_SIZE * (n))
 145 #define CDNS_DPN_B0_CH_EN(n)                    (0x104 + CDNS_DP_SIZE * (n))
 146 #define CDNS_DPN_B0_SAMPLE_CTRL(n)              (0x108 + CDNS_DP_SIZE * (n))
 147 #define CDNS_DPN_B0_OFFSET_CTRL(n)              (0x10C + CDNS_DP_SIZE * (n))
 148 #define CDNS_DPN_B0_HCTRL(n)                    (0x110 + CDNS_DP_SIZE * (n))
 149 #define CDNS_DPN_B0_ASYNC_CTRL(n)               (0x114 + CDNS_DP_SIZE * (n))
 150
 151 #define CDNS_DPN_B1_CONFIG(n)                   (0x118 + CDNS_DP_SIZE * (n))
 152 #define CDNS_DPN_B1_CH_EN(n)                    (0x11C + CDNS_DP_SIZE * (n))
 153 #define CDNS_DPN_B1_SAMPLE_CTRL(n)              (0x120 + CDNS_DP_SIZE * (n))
 154 #define CDNS_DPN_B1_OFFSET_CTRL(n)              (0x124 + CDNS_DP_SIZE * (n))
 155 #define CDNS_DPN_B1_HCTRL(n)                    (0x128 + CDNS_DP_SIZE * (n))
 156 #define CDNS_DPN_B1_ASYNC_CTRL(n)               (0x12C + CDNS_DP_SIZE * (n))
 157
 158 #define CDNS_DPN_CONFIG_BPM                     BIT(18)
 159 #define CDNS_DPN_CONFIG_BGC                     GENMASK(17, 16)
 160 #define CDNS_DPN_CONFIG_WL                      GENMASK(12, 8)
 161 #define CDNS_DPN_CONFIG_PORT_DAT                GENMASK(3, 2)
 162 #define CDNS_DPN_CONFIG_PORT_FLOW               GENMASK(1, 0)
 163
 164 #define CDNS_DPN_SAMPLE_CTRL_SI                 GENMASK(15, 0)
 165
 166 #define CDNS_DPN_OFFSET_CTRL_1                  GENMASK(7, 0)
 167 #define CDNS_DPN_OFFSET_CTRL_2                  GENMASK(15, 8)
 168
 169 #define CDNS_DPN_HCTRL_HSTOP                    GENMASK(3, 0)
 170 #define CDNS_DPN_HCTRL_HSTART                   GENMASK(7, 4)
 171 #define CDNS_DPN_HCTRL_LCTRL                    GENMASK(10, 8)
 172
 173 #define CDNS_PORTCTRL                           0x130
 174 #define CDNS_PORTCTRL_DIRN                      BIT(7)
 175 #define CDNS_PORTCTRL_BANK_INVERT               BIT(8)
 176
 177 #define CDNS_PORT_OFFSET                        0x80
 178
 179 #define CDNS_PDI_CONFIG(n)                      (0x1100 + (n) * 16)
 180
 181 #define CDNS_PDI_CONFIG_SOFT_RESET              BIT(24)
 182 #define CDNS_PDI_CONFIG_CHANNEL                 GENMASK(15, 8)
 183 #define CDNS_PDI_CONFIG_PORT                    GENMASK(4, 0)
 184
 185 /* Driver defaults */
 186 #define CDNS_TX_TIMEOUT                         2000
 187
 188 #define CDNS_SCP_RX_FIFOLEVEL                   0x2
 189
 190 /*
 191  * register accessor helpers
 192  */
 193 static inline u32 cdns_readl(struct sdw_cdns *cdns, int offset)
 194 {
 195         return readl(cdns->registers + offset);
 196 }
 197
 198 static inline void cdns_writel(struct sdw_cdns *cdns, int offset, u32 value)
 199 {
 200         writel(value, cdns->registers + offset);
 201 }
 202
 203 static inline void cdns_updatel(struct sdw_cdns *cdns,
 204                                 int offset, u32 mask, u32 val)
 205 {
 206         u32 tmp;
 207
 208         tmp = cdns_readl(cdns, offset);
 209         tmp = (tmp & ~mask) | val;
 210         cdns_writel(cdns, offset, tmp);
 211 }
 212
 213 static int cdns_set_wait(struct sdw_cdns *cdns, int offset, u32 mask, u32 value)
 214 {
 215         int timeout = 10;
 216         u32 reg_read;
 217
 218         /* Wait for bit to be set */
 219         do {
 220                 reg_read = readl(cdns->registers + offset);
 221                 if ((reg_read & mask) == value)
 222                         return 0;
 223
 224                 timeout--;
 225                 usleep_range(50, 100);
 226         } while (timeout != 0);
 227
 228         return -ETIMEDOUT;
 229 }
 230
 231 static int cdns_clear_bit(struct sdw_cdns *cdns, int offset, u32 value)
 232 {
 233         writel(value, cdns->registers + offset);
 234
 235         /* Wait for bit to be self cleared */
 236         return cdns_set_wait(cdns, offset, value, 0);
 237 }
 238
 239 /*
 240  * all changes to the MCP_CONFIG, MCP_CONTROL, MCP_CMDCTRL and MCP_PHYCTRL
 241  * need to be confirmed with a write to MCP_CONFIG_UPDATE
 242  */
 243 static int cdns_config_update(struct sdw_cdns *cdns)
 244 {
 245         int ret;
 246
 247         if (sdw_cdns_is_clock_stop(cdns)) {
 248                 dev_err(cdns->dev, "Cannot program MCP_CONFIG_UPDATE in ClockStopMode\n");
 249                 return -EINVAL;
 250         }
 251
 252         ret = cdns_clear_bit(cdns, CDNS_MCP_CONFIG_UPDATE,
 253                              CDNS_MCP_CONFIG_UPDATE_BIT);
 254         if (ret < 0)
 255                 dev_err(cdns->dev, "Config update timedout\n");
 256
 257         return ret;
 258 }
 259
 260 /*
 261  * debugfs
 262  */
 263 #ifdef CONFIG_DEBUG_FS
 264
 265 #define RD_BUF (2 * PAGE_SIZE)
 266
 267 static ssize_t cdns_sprintf(struct sdw_cdns *cdns,
 268                             char *buf, size_t pos, unsigned int reg)
 269 {
 270         return scnprintf(buf + pos, RD_BUF - pos,
 271                          "%4x\t%8x\n", reg, cdns_readl(cdns, reg));
 272 }
 273
 274 static int cdns_reg_show(struct seq_file *s, void *data)
 275 {
 276         struct sdw_cdns *cdns = s->private;
 277         char *buf;
 278         ssize_t ret;
 279         int num_ports;
 280         int i, j;
 281
 282         buf = kzalloc(RD_BUF, GFP_KERNEL);
 283         if (!buf)
 284                 return -ENOMEM;
 285
 286         ret = scnprintf(buf, RD_BUF, "Register  Value\n");
 287         ret += scnprintf(buf + ret, RD_BUF - ret, "\nMCP Registers\n");
 288         /* 8 MCP registers */
 289         for (i = CDNS_MCP_CONFIG; i <= CDNS_MCP_PHYCTRL; i += sizeof(u32))
 290                 ret += cdns_sprintf(cdns, buf, ret, i);
 291
 292         ret += scnprintf(buf + ret, RD_BUF - ret,
 293                          "\nStatus & Intr Registers\n");
 294         /* 13 Status & Intr registers (offsets 0x70 and 0x74 not defined) */
 295         for (i = CDNS_MCP_STAT; i <=  CDNS_MCP_FIFOSTAT; i += sizeof(u32))
 296                 ret += cdns_sprintf(cdns, buf, ret, i);
 297
 298         ret += scnprintf(buf + ret, RD_BUF - ret,
 299                          "\nSSP & Clk ctrl Registers\n");
 300         ret += cdns_sprintf(cdns, buf, ret, CDNS_MCP_SSP_CTRL0);
 301         ret += cdns_sprintf(cdns, buf, ret, CDNS_MCP_SSP_CTRL1);
 302         ret += cdns_sprintf(cdns, buf, ret, CDNS_MCP_CLK_CTRL0);
 303         ret += cdns_sprintf(cdns, buf, ret, CDNS_MCP_CLK_CTRL1);
 304
 305         ret += scnprintf(buf + ret, RD_BUF - ret,
 306                          "\nDPn B0 Registers\n");
 307
 308         num_ports = cdns->num_ports;
 309
 310         for (i = 0; i < num_ports; i++) {
 311                 ret += scnprintf(buf + ret, RD_BUF - ret,
 312                                  "\nDP-%d\n", i);
 313                 for (j = CDNS_DPN_B0_CONFIG(i);
 314                      j < CDNS_DPN_B0_ASYNC_CTRL(i); j += sizeof(u32))
 315                         ret += cdns_sprintf(cdns, buf, ret, j);
 316         }
 317
 318         ret += scnprintf(buf + ret, RD_BUF - ret,
 319                          "\nDPn B1 Registers\n");
 320         for (i = 0; i < num_ports; i++) {
 321                 ret += scnprintf(buf + ret, RD_BUF - ret,
 322                                  "\nDP-%d\n", i);
 323
 324                 for (j = CDNS_DPN_B1_CONFIG(i);
 325                      j < CDNS_DPN_B1_ASYNC_CTRL(i); j += sizeof(u32))
 326                         ret += cdns_sprintf(cdns, buf, ret, j);
 327         }
 328
 329         ret += scnprintf(buf + ret, RD_BUF - ret,
 330                          "\nDPn Control Registers\n");
 331         for (i = 0; i < num_ports; i++)
 332                 ret += cdns_sprintf(cdns, buf, ret,
 333                                 CDNS_PORTCTRL + i * CDNS_PORT_OFFSET);
 334
 335         ret += scnprintf(buf + ret, RD_BUF - ret,
 336                          "\nPDIn Config Registers\n");
 337
 338         /* number of PDI and ports is interchangeable */
 339         for (i = 0; i < num_ports; i++)
 340                 ret += cdns_sprintf(cdns, buf, ret, CDNS_PDI_CONFIG(i));
 341
 342         seq_printf(s, "%s", buf);
 343         kfree(buf);
 344
 345         return 0;
 346 }
 347 DEFINE_SHOW_ATTRIBUTE(cdns_reg);
 348
 349 static int cdns_hw_reset(void *data, u64 value)
 350 {
 351         struct sdw_cdns *cdns = data;
 352         int ret;
 353
 354         if (value != 1)
 355                 return -EINVAL;
 356
 357         /* Userspace changed the hardware state behind the kernel's back */
 358         add_taint(TAINT_USER, LOCKDEP_STILL_OK);
 359
 360         ret = sdw_cdns_exit_reset(cdns);
 361
 362         dev_dbg(cdns->dev, "link hw_reset done: %d\n", ret);
 363
 364         return ret;
 365 }
 366
 367 DEFINE_DEBUGFS_ATTRIBUTE(cdns_hw_reset_fops, NULL, cdns_hw_reset, "%llu\n");
 368
 369 /**
 370  * sdw_cdns_debugfs_init() - Cadence debugfs init
 371  * @cdns: Cadence instance
 372  * @root: debugfs root
 373  */
 374 void sdw_cdns_debugfs_init(struct sdw_cdns *cdns, struct dentry *root)
 375 {
 376         debugfs_create_file("cdns-registers", 0400, root, cdns, &cdns_reg_fops);
 377
 378         debugfs_create_file("cdns-hw-reset", 0200, root, cdns,
 379                             &cdns_hw_reset_fops);
 380 }
 381 EXPORT_SYMBOL_GPL(sdw_cdns_debugfs_init);
 382
 383 #endif /* CONFIG_DEBUG_FS */
 384
 385 /*
 386  * IO Calls
 387  */
 388 static enum sdw_command_response
 389 cdns_fill_msg_resp(struct sdw_cdns *cdns,
 390                    struct sdw_msg *msg, int count, int offset)
 391 {
 392         int nack = 0, no_ack = 0;
 393         int i;
 394
 395         /* check message response */
 396         for (i = 0; i < count; i++) {
 397                 if (!(cdns->response_buf[i] & CDNS_MCP_RESP_ACK)) {
 398                         no_ack = 1;
 399                         dev_dbg_ratelimited(cdns->dev, "Msg Ack not received\n");
 400                         if (cdns->response_buf[i] & CDNS_MCP_RESP_NACK) {
 401                                 nack = 1;
 402                                 dev_err_ratelimited(cdns->dev, "Msg NACK received\n");
 403                         }
 404                 }
 405         }
 406
 407         if (nack) {
 408                 dev_err_ratelimited(cdns->dev, "Msg NACKed for Slave %d\n", msg->dev_num);
 409                 return SDW_CMD_FAIL;
 410         }
 411
 412         if (no_ack) {
 413                 dev_dbg_ratelimited(cdns->dev, "Msg ignored for Slave %d\n", msg->dev_num);
 414                 return SDW_CMD_IGNORED;
 415         }
 416
 417         /* fill response */
 418         for (i = 0; i < count; i++)
 419                 msg->buf[i + offset] = cdns->response_buf[i] >>
 420                                 SDW_REG_SHIFT(CDNS_MCP_RESP_RDATA);
 421
 422         return SDW_CMD_OK;
 423 }
 424
 425 static enum sdw_command_response
 426 _cdns_xfer_msg(struct sdw_cdns *cdns, struct sdw_msg *msg, int cmd,
 427                int offset, int count, bool defer)
 428 {
 429         unsigned long time;
 430         u32 base, i, data;
 431         u16 addr;
 432
 433         /* Program the watermark level for RX FIFO */
 434         if (cdns->msg_count != count) {
 435                 cdns_writel(cdns, CDNS_MCP_FIFOLEVEL, count);
 436                 cdns->msg_count = count;
 437         }
 438
 439         base = CDNS_MCP_CMD_BASE;
 440         addr = msg->addr;
 441
 442         for (i = 0; i < count; i++) {
 443                 data = msg->dev_num << SDW_REG_SHIFT(CDNS_MCP_CMD_DEV_ADDR);
 444                 data |= cmd << SDW_REG_SHIFT(CDNS_MCP_CMD_COMMAND);
 445                 data |= addr++  << SDW_REG_SHIFT(CDNS_MCP_CMD_REG_ADDR_L);
 446
 447                 if (msg->flags == SDW_MSG_FLAG_WRITE)
 448                         data |= msg->buf[i + offset];
 449
 450                 data |= msg->ssp_sync << SDW_REG_SHIFT(CDNS_MCP_CMD_SSP_TAG);
 451                 cdns_writel(cdns, base, data);
 452                 base += CDNS_MCP_CMD_WORD_LEN;
 453         }
 454
 455         if (defer)
 456                 return SDW_CMD_OK;
 457
 458         /* wait for timeout or response */
 459         time = wait_for_completion_timeout(&cdns->tx_complete,
 460                                            msecs_to_jiffies(CDNS_TX_TIMEOUT));
 461         if (!time) {
 462                 dev_err(cdns->dev, "IO transfer timed out, cmd %d device %d addr %x len %d\n",
 463                         cmd, msg->dev_num, msg->addr, msg->len);
 464                 msg->len = 0;
 465                 return SDW_CMD_TIMEOUT;
 466         }
 467
 468         return cdns_fill_msg_resp(cdns, msg, count, offset);
 469 }
 470
 471 static enum sdw_command_response
 472 cdns_program_scp_addr(struct sdw_cdns *cdns, struct sdw_msg *msg)
 473 {
 474         int nack = 0, no_ack = 0;
 475         unsigned long time;
 476         u32 data[2], base;
 477         int i;
 478
 479         /* Program the watermark level for RX FIFO */
 480         if (cdns->msg_count != CDNS_SCP_RX_FIFOLEVEL) {
 481                 cdns_writel(cdns, CDNS_MCP_FIFOLEVEL, CDNS_SCP_RX_FIFOLEVEL);
 482                 cdns->msg_count = CDNS_SCP_RX_FIFOLEVEL;
 483         }
 484
 485         data[0] = msg->dev_num << SDW_REG_SHIFT(CDNS_MCP_CMD_DEV_ADDR);
 486         data[0] |= 0x3 << SDW_REG_SHIFT(CDNS_MCP_CMD_COMMAND);
 487         data[1] = data[0];
 488
 489         data[0] |= SDW_SCP_ADDRPAGE1 << SDW_REG_SHIFT(CDNS_MCP_CMD_REG_ADDR_L);
 490         data[1] |= SDW_SCP_ADDRPAGE2 << SDW_REG_SHIFT(CDNS_MCP_CMD_REG_ADDR_L);
 491
 492         data[0] |= msg->addr_page1;
 493         data[1] |= msg->addr_page2;
 494
 495         base = CDNS_MCP_CMD_BASE;
 496         cdns_writel(cdns, base, data[0]);
 497         base += CDNS_MCP_CMD_WORD_LEN;
 498         cdns_writel(cdns, base, data[1]);
 499
 500         time = wait_for_completion_timeout(&cdns->tx_complete,
 501                                            msecs_to_jiffies(CDNS_TX_TIMEOUT));
 502         if (!time) {
 503                 dev_err(cdns->dev, "SCP Msg trf timed out\n");
 504                 msg->len = 0;
 505                 return SDW_CMD_TIMEOUT;
 506         }
 507
 508         /* check response the writes */
 509         for (i = 0; i < 2; i++) {
 510                 if (!(cdns->response_buf[i] & CDNS_MCP_RESP_ACK)) {
 511                         no_ack = 1;
 512                         dev_err(cdns->dev, "Program SCP Ack not received\n");
 513                         if (cdns->response_buf[i] & CDNS_MCP_RESP_NACK) {
 514                                 nack = 1;
 515                                 dev_err(cdns->dev, "Program SCP NACK received\n");
 516                         }
 517                 }
 518         }
 519
 520         /* For NACK, NO ack, don't return err if we are in Broadcast mode */
 521         if (nack) {
 522                 dev_err_ratelimited(cdns->dev,
 523                                     "SCP_addrpage NACKed for Slave %d\n", msg->dev_num);
 524                 return SDW_CMD_FAIL;
 525         }
 526
 527         if (no_ack) {
 528                 dev_dbg_ratelimited(cdns->dev,
 529                                     "SCP_addrpage ignored for Slave %d\n", msg->dev_num);
 530                 return SDW_CMD_IGNORED;
 531         }
 532
 533         return SDW_CMD_OK;
 534 }
 535
 536 static int cdns_prep_msg(struct sdw_cdns *cdns, struct sdw_msg *msg, int *cmd)
 537 {
 538         int ret;
 539
 540         if (msg->page) {
 541                 ret = cdns_program_scp_addr(cdns, msg);
 542                 if (ret) {
 543                         msg->len = 0;
 544                         return ret;
 545                 }
 546         }
 547
 548         switch (msg->flags) {
 549         case SDW_MSG_FLAG_READ:
 550                 *cmd = CDNS_MCP_CMD_READ;
 551                 break;
 552
 553         case SDW_MSG_FLAG_WRITE:
 554                 *cmd = CDNS_MCP_CMD_WRITE;
 555                 break;
 556
 557         default:
 558                 dev_err(cdns->dev, "Invalid msg cmd: %d\n", msg->flags);
 559                 return -EINVAL;
 560         }
 561
 562         return 0;
 563 }
 564
 565 enum sdw_command_response
 566 cdns_xfer_msg(struct sdw_bus *bus, struct sdw_msg *msg)
 567 {
 568         struct sdw_cdns *cdns = bus_to_cdns(bus);
 569         int cmd = 0, ret, i;
 570
 571         ret = cdns_prep_msg(cdns, msg, &cmd);
 572         if (ret)
 573                 return SDW_CMD_FAIL_OTHER;
 574
 575         for (i = 0; i < msg->len / CDNS_MCP_CMD_LEN; i++) {
 576                 ret = _cdns_xfer_msg(cdns, msg, cmd, i * CDNS_MCP_CMD_LEN,
 577                                      CDNS_MCP_CMD_LEN, false);
 578                 if (ret < 0)
 579                         goto exit;
 580         }
 581
 582         if (!(msg->len % CDNS_MCP_CMD_LEN))
 583                 goto exit;
 584
 585         ret = _cdns_xfer_msg(cdns, msg, cmd, i * CDNS_MCP_CMD_LEN,
 586                              msg->len % CDNS_MCP_CMD_LEN, false);
 587
 588 exit:
 589         return ret;
 590 }
 591 EXPORT_SYMBOL(cdns_xfer_msg);
 592
 593 enum sdw_command_response
 594 cdns_xfer_msg_defer(struct sdw_bus *bus,
 595                     struct sdw_msg *msg, struct sdw_defer *defer)
 596 {
 597         struct sdw_cdns *cdns = bus_to_cdns(bus);
 598         int cmd = 0, ret;
 599
 600         /* for defer only 1 message is supported */
 601         if (msg->len > 1)
 602                 return -ENOTSUPP;
 603
 604         ret = cdns_prep_msg(cdns, msg, &cmd);
 605         if (ret)
 606                 return SDW_CMD_FAIL_OTHER;
 607
 608         cdns->defer = defer;
 609         cdns->defer->length = msg->len;
 610
 611         return _cdns_xfer_msg(cdns, msg, cmd, 0, msg->len, true);
 612 }
 613 EXPORT_SYMBOL(cdns_xfer_msg_defer);
 614
 615 enum sdw_command_response
 616 cdns_reset_page_addr(struct sdw_bus *bus, unsigned int dev_num)
 617 {
 618         struct sdw_cdns *cdns = bus_to_cdns(bus);
 619         struct sdw_msg msg;
 620
 621         /* Create dummy message with valid device number */
 622         memset(&msg, 0, sizeof(msg));
 623         msg.dev_num = dev_num;
 624
 625         return cdns_program_scp_addr(cdns, &msg);
 626 }
 627 EXPORT_SYMBOL(cdns_reset_page_addr);
 628
 629 /*
 630  * IRQ handling
 631  */
 632
 633 static void cdns_read_response(struct sdw_cdns *cdns)
 634 {
 635         u32 num_resp, cmd_base;
 636         int i;
 637
 638         num_resp = cdns_readl(cdns, CDNS_MCP_FIFOSTAT);
 639         num_resp &= CDNS_MCP_RX_FIFO_AVAIL;
 640
 641         cmd_base = CDNS_MCP_CMD_BASE;
 642
 643         for (i = 0; i < num_resp; i++) {
 644                 cdns->response_buf[i] = cdns_readl(cdns, cmd_base);
 645                 cmd_base += CDNS_MCP_CMD_WORD_LEN;
 646         }
 647 }
 648
 649 static int cdns_update_slave_status(struct sdw_cdns *cdns,
 650                                     u32 slave0, u32 slave1)
 651 {
 652         enum sdw_slave_status status[SDW_MAX_DEVICES + 1];
 653         bool is_slave = false;
 654         u64 slave;
 655         u32 mask;
 656         int i, set_status;
 657
 658         /* combine the two status */
 659         slave = ((u64)slave1 << 32) | slave0;
 660         memset(status, 0, sizeof(status));
 661
 662         for (i = 0; i <= SDW_MAX_DEVICES; i++) {
 663                 mask = (slave >> (i * CDNS_MCP_SLAVE_STATUS_NUM)) &
 664                                 CDNS_MCP_SLAVE_STATUS_BITS;
 665                 if (!mask)
 666                         continue;
 667
 668                 is_slave = true;
 669                 set_status = 0;
 670
 671                 if (mask & CDNS_MCP_SLAVE_INTSTAT_RESERVED) {
 672                         status[i] = SDW_SLAVE_RESERVED;
 673                         set_status++;
 674                 }
 675
 676                 if (mask & CDNS_MCP_SLAVE_INTSTAT_ATTACHED) {
 677                         status[i] = SDW_SLAVE_ATTACHED;
 678                         set_status++;
 679                 }
 680
 681                 if (mask & CDNS_MCP_SLAVE_INTSTAT_ALERT) {
 682                         status[i] = SDW_SLAVE_ALERT;
 683                         set_status++;
 684                 }
 685
 686                 if (mask & CDNS_MCP_SLAVE_INTSTAT_NPRESENT) {
 687                         status[i] = SDW_SLAVE_UNATTACHED;
 688                         set_status++;
 689                 }
 690
 691                 /* first check if Slave reported multiple status */
 692                 if (set_status > 1) {
 693                         u32 val;
 694
 695                         dev_warn_ratelimited(cdns->dev,
 696                                              "Slave %d reported multiple Status: %d\n",
 697                                              i, mask);
 698
 699                         /* check latest status extracted from PING commands */
 700                         val = cdns_readl(cdns, CDNS_MCP_SLAVE_STAT);
 701                         val >>= (i * 2);
 702
 703                         switch (val & 0x3) {
 704                         case 0:
 705                                 status[i] = SDW_SLAVE_UNATTACHED;
 706                                 break;
 707                         case 1:
 708                                 status[i] = SDW_SLAVE_ATTACHED;
 709                                 break;
 710                         case 2:
 711                                 status[i] = SDW_SLAVE_ALERT;
 712                                 break;
 713                         case 3:
 714                         default:
 715                                 status[i] = SDW_SLAVE_RESERVED;
 716                                 break;
 717                         }
 718
 719                         dev_warn_ratelimited(cdns->dev,
 720                                              "Slave %d status updated to %d\n",
 721                                              i, status[i]);
 722
 723                 }
 724         }
 725
 726         if (is_slave)
 727                 return sdw_handle_slave_status(&cdns->bus, status);
 728
 729         return 0;
 730 }
 731
 732 /**
 733  * sdw_cdns_irq() - Cadence interrupt handler
 734  * @irq: irq number
 735  * @dev_id: irq context
 736  */
 737 irqreturn_t sdw_cdns_irq(int irq, void *dev_id)
 738 {
 739         struct sdw_cdns *cdns = dev_id;
 740         u32 int_status;
 741         int ret = IRQ_HANDLED;
 742
 743         /* Check if the link is up */
 744         if (!cdns->link_up)
 745                 return IRQ_NONE;
 746
 747         int_status = cdns_readl(cdns, CDNS_MCP_INTSTAT);
 748
 749         /* check for reserved values read as zero */
 750         if (int_status & CDNS_MCP_INT_RESERVED)
 751                 return IRQ_NONE;
 752
 753         if (!(int_status & CDNS_MCP_INT_IRQ))
 754                 return IRQ_NONE;
 755
 756         if (int_status & CDNS_MCP_INT_RX_WL) {
 757                 cdns_read_response(cdns);
 758
 759                 if (cdns->defer) {
 760                         cdns_fill_msg_resp(cdns, cdns->defer->msg,
 761                                            cdns->defer->length, 0);
 762                         complete(&cdns->defer->complete);
 763                         cdns->defer = NULL;
 764                 } else {
 765                         complete(&cdns->tx_complete);
 766                 }
 767         }
 768
 769         if (int_status & CDNS_MCP_INT_PARITY) {
 770                 /* Parity error detected by Master */
 771                 dev_err_ratelimited(cdns->dev, "Parity error\n");
 772         }
 773
 774         if (int_status & CDNS_MCP_INT_CTRL_CLASH) {
 775                 /* Slave is driving bit slot during control word */
 776                 dev_err_ratelimited(cdns->dev, "Bus clash for control word\n");
 777         }
 778
 779         if (int_status & CDNS_MCP_INT_DATA_CLASH) {
 780                 /*
 781                  * Multiple slaves trying to drive bit slot, or issue with
 782                  * ownership of data bits or Slave gone bonkers
 783                  */
 784                 dev_err_ratelimited(cdns->dev, "Bus clash for data word\n");
 785         }
 786
 787         if (int_status & CDNS_MCP_INT_SLAVE_MASK) {
 788                 /* Mask the Slave interrupt and wake thread */
 789                 cdns_updatel(cdns, CDNS_MCP_INTMASK,
 790                              CDNS_MCP_INT_SLAVE_MASK, 0);
 791
 792                 int_status &= ~CDNS_MCP_INT_SLAVE_MASK;
 793                 ret = IRQ_WAKE_THREAD;
 794         }
 795
 796         cdns_writel(cdns, CDNS_MCP_INTSTAT, int_status);
 797         return ret;
 798 }
 799 EXPORT_SYMBOL(sdw_cdns_irq);
 800
 801 /**
 802  * sdw_cdns_thread() - Cadence irq thread handler
 803  * @irq: irq number
 804  * @dev_id: irq context
 805  */
 806 irqreturn_t sdw_cdns_thread(int irq, void *dev_id)
 807 {
 808         struct sdw_cdns *cdns = dev_id;
 809         u32 slave0, slave1;
 810
 811         dev_dbg_ratelimited(cdns->dev, "Slave status change\n");
 812
 813         slave0 = cdns_readl(cdns, CDNS_MCP_SLAVE_INTSTAT0);
 814         slave1 = cdns_readl(cdns, CDNS_MCP_SLAVE_INTSTAT1);
 815
 816         cdns_update_slave_status(cdns, slave0, slave1);
 817         cdns_writel(cdns, CDNS_MCP_SLAVE_INTSTAT0, slave0);
 818         cdns_writel(cdns, CDNS_MCP_SLAVE_INTSTAT1, slave1);
 819
 820         /* clear and unmask Slave interrupt now */
 821         cdns_writel(cdns, CDNS_MCP_INTSTAT, CDNS_MCP_INT_SLAVE_MASK);
 822         cdns_updatel(cdns, CDNS_MCP_INTMASK,
 823                      CDNS_MCP_INT_SLAVE_MASK, CDNS_MCP_INT_SLAVE_MASK);
 824
 825         return IRQ_HANDLED;
 826 }
 827 EXPORT_SYMBOL(sdw_cdns_thread);
 828
 829 /*
 830  * init routines
 831  */
 832
 833 /**
 834  * sdw_cdns_exit_reset() - Program reset parameters and start bus operations
 835  * @cdns: Cadence instance
 836  */
 837 int sdw_cdns_exit_reset(struct sdw_cdns *cdns)
 838 {
 839         /* program maximum length reset to be safe */
 840         cdns_updatel(cdns, CDNS_MCP_CONTROL,
 841                      CDNS_MCP_CONTROL_RST_DELAY,
 842                      CDNS_MCP_CONTROL_RST_DELAY);
 843
 844         /* use hardware generated reset */
 845         cdns_updatel(cdns, CDNS_MCP_CONTROL,
 846                      CDNS_MCP_CONTROL_HW_RST,
 847                      CDNS_MCP_CONTROL_HW_RST);
 848
 849         /* commit changes */
 850         cdns_updatel(cdns, CDNS_MCP_CONFIG_UPDATE,
 851                      CDNS_MCP_CONFIG_UPDATE_BIT,
 852                      CDNS_MCP_CONFIG_UPDATE_BIT);
 853
 854         /* don't wait here */
 855         return 0;
 856
 857 }
 858 EXPORT_SYMBOL(sdw_cdns_exit_reset);
 859
 860 /**
 861  * sdw_cdns_enable_slave_interrupt() - Enable SDW slave interrupts
 862  * @cdns: Cadence instance
 863  * @state: boolean for true/false
 864  */
 865 static void cdns_enable_slave_interrupts(struct sdw_cdns *cdns, bool state)
 866 {
 867         u32 mask;
 868
 869         mask = cdns_readl(cdns, CDNS_MCP_INTMASK);
 870         if (state)
 871                 mask |= CDNS_MCP_INT_SLAVE_MASK;
 872         else
 873                 mask &= ~CDNS_MCP_INT_SLAVE_MASK;
 874
 875         cdns_writel(cdns, CDNS_MCP_INTMASK, mask);
 876 }
 877
 878 /**
 879  * sdw_cdns_enable_interrupt() - Enable SDW interrupts
 880  * @cdns: Cadence instance
 881  * @state: True if we are trying to enable interrupt.
 882  */
 883 int sdw_cdns_enable_interrupt(struct sdw_cdns *cdns, bool state)
 884 {
 885         u32 slave_intmask0 = 0;
 886         u32 slave_intmask1 = 0;
 887         u32 mask = 0;
 888
 889         if (!state)
 890                 goto update_masks;
 891
 892         slave_intmask0 = CDNS_MCP_SLAVE_INTMASK0_MASK;
 893         slave_intmask1 = CDNS_MCP_SLAVE_INTMASK1_MASK;
 894
 895         /* enable detection of all slave state changes */
 896         mask = CDNS_MCP_INT_SLAVE_MASK;
 897
 898         /* enable detection of bus issues */
 899         mask |= CDNS_MCP_INT_CTRL_CLASH | CDNS_MCP_INT_DATA_CLASH |
 900                 CDNS_MCP_INT_PARITY;
 901
 902         /* no detection of port interrupts for now */
 903
 904         /* enable detection of RX fifo level */
 905         mask |= CDNS_MCP_INT_RX_WL;
 906
 907         /*
 908          * CDNS_MCP_INT_IRQ needs to be set otherwise all previous
 909          * settings are irrelevant
 910          */
 911         mask |= CDNS_MCP_INT_IRQ;
 912
 913         if (interrupt_mask) /* parameter override */
 914                 mask = interrupt_mask;
 915
 916 update_masks:
 917         /* clear slave interrupt status before enabling interrupt */
 918         if (state) {
 919                 u32 slave_state;
 920
 921                 slave_state = cdns_readl(cdns, CDNS_MCP_SLAVE_INTSTAT0);
 922                 cdns_writel(cdns, CDNS_MCP_SLAVE_INTSTAT0, slave_state);
 923                 slave_state = cdns_readl(cdns, CDNS_MCP_SLAVE_INTSTAT1);
 924                 cdns_writel(cdns, CDNS_MCP_SLAVE_INTSTAT1, slave_state);
 925         }
 926
 927         cdns_writel(cdns, CDNS_MCP_SLAVE_INTMASK0, slave_intmask0);
 928         cdns_writel(cdns, CDNS_MCP_SLAVE_INTMASK1, slave_intmask1);
 929         cdns_writel(cdns, CDNS_MCP_INTMASK, mask);
 930
 931         return 0;
 932 }
 933 EXPORT_SYMBOL(sdw_cdns_enable_interrupt);
 934
 935 static int cdns_allocate_pdi(struct sdw_cdns *cdns,
 936                              struct sdw_cdns_pdi **stream,
 937                              u32 num, u32 pdi_offset)
 938 {
 939         struct sdw_cdns_pdi *pdi;
 940         int i;
 941
 942         if (!num)
 943                 return 0;
 944
 945         pdi = devm_kcalloc(cdns->dev, num, sizeof(*pdi), GFP_KERNEL);
 946         if (!pdi)
 947                 return -ENOMEM;
 948
 949         for (i = 0; i < num; i++) {
 950                 pdi[i].num = i + pdi_offset;
 951         }
 952
 953         *stream = pdi;
 954         return 0;
 955 }
 956
 957 /**
 958  * sdw_cdns_pdi_init() - PDI initialization routine
 959  *
 960  * @cdns: Cadence instance
 961  * @config: Stream configurations
 962  */
 963 int sdw_cdns_pdi_init(struct sdw_cdns *cdns,
 964                       struct sdw_cdns_stream_config config)
 965 {
 966         struct sdw_cdns_streams *stream;
 967         int offset;
 968         int ret;
 969
 970         cdns->pcm.num_bd = config.pcm_bd;
 971         cdns->pcm.num_in = config.pcm_in;
 972         cdns->pcm.num_out = config.pcm_out;
 973         cdns->pdm.num_bd = config.pdm_bd;
 974         cdns->pdm.num_in = config.pdm_in;
 975         cdns->pdm.num_out = config.pdm_out;
 976
 977         /* Allocate PDIs for PCMs */
 978         stream = &cdns->pcm;
 979
 980         /* we allocate PDI0 and PDI1 which are used for Bulk */
 981         offset = 0;
 982
 983         ret = cdns_allocate_pdi(cdns, &stream->bd,
 984                                 stream->num_bd, offset);
 985         if (ret)
 986                 return ret;
 987
 988         offset += stream->num_bd;
 989
 990         ret = cdns_allocate_pdi(cdns, &stream->in,
 991                                 stream->num_in, offset);
 992         if (ret)
 993                 return ret;
 994
 995         offset += stream->num_in;
 996
 997         ret = cdns_allocate_pdi(cdns, &stream->out,
 998                                 stream->num_out, offset);
 999         if (ret)
1000                 return ret;
1001
1002         /* Update total number of PCM PDIs */
1003         stream->num_pdi = stream->num_bd + stream->num_in + stream->num_out;
1004         cdns->num_ports = stream->num_pdi;
1005
1006         /* Allocate PDIs for PDMs */
1007         stream = &cdns->pdm;
1008         ret = cdns_allocate_pdi(cdns, &stream->bd,
1009                                 stream->num_bd, offset);
1010         if (ret)
1011                 return ret;
1012
1013         offset += stream->num_bd;
1014
1015         ret = cdns_allocate_pdi(cdns, &stream->in,
1016                                 stream->num_in, offset);
1017         if (ret)
1018                 return ret;
1019
1020         offset += stream->num_in;
1021
1022         ret = cdns_allocate_pdi(cdns, &stream->out,
1023                                 stream->num_out, offset);
1024
1025         if (ret)
1026                 return ret;
1027
1028         /* Update total number of PDM PDIs */
1029         stream->num_pdi = stream->num_bd + stream->num_in + stream->num_out;
1030         cdns->num_ports += stream->num_pdi;
1031
1032         return 0;
1033 }
1034 EXPORT_SYMBOL(sdw_cdns_pdi_init);
1035
1036 static u32 cdns_set_initial_frame_shape(int n_rows, int n_cols)
1037 {
1038         u32 val;
1039         int c;
1040         int r;
1041
1042         r = sdw_find_row_index(n_rows);
1043         c = sdw_find_col_index(n_cols) & CDNS_MCP_FRAME_SHAPE_COL_MASK;
1044
1045         val = (r << CDNS_MCP_FRAME_SHAPE_ROW_OFFSET) | c;
1046
1047         return val;
1048 }
1049
1050 static void cdns_init_clock_ctrl(struct sdw_cdns *cdns)
1051 {
1052         struct sdw_bus *bus = &cdns->bus;
1053         struct sdw_master_prop *prop = &bus->prop;
1054         u32 val;
1055         u32 ssp_interval;
1056         int divider;
1057
1058         /* Set clock divider */
1059         divider = (prop->mclk_freq / prop->max_clk_freq) - 1;
1060
1061         cdns_updatel(cdns, CDNS_MCP_CLK_CTRL0,
1062                      CDNS_MCP_CLK_MCLKD_MASK, divider);
1063         cdns_updatel(cdns, CDNS_MCP_CLK_CTRL1,
1064                      CDNS_MCP_CLK_MCLKD_MASK, divider);
1065
1066         /*
1067          * Frame shape changes after initialization have to be done
1068          * with the bank switch mechanism
1069          */
1070         val = cdns_set_initial_frame_shape(prop->default_row,
1071                                            prop->default_col);
1072         cdns_writel(cdns, CDNS_MCP_FRAME_SHAPE_INIT, val);
1073
1074         /* Set SSP interval to default value */
1075         ssp_interval = prop->default_frame_rate / SDW_CADENCE_GSYNC_HZ;
1076         cdns_writel(cdns, CDNS_MCP_SSP_CTRL0, ssp_interval);
1077         cdns_writel(cdns, CDNS_MCP_SSP_CTRL1, ssp_interval);
1078 }
1079
1080 /**
1081  * sdw_cdns_init() - Cadence initialization
1082  * @cdns: Cadence instance
1083  */
1084 int sdw_cdns_init(struct sdw_cdns *cdns)
1085 {
1086         u32 val;
1087
1088         cdns_init_clock_ctrl(cdns);
1089
1090         /* reset msg_count to default value of FIFOLEVEL */
1091         cdns->msg_count = cdns_readl(cdns, CDNS_MCP_FIFOLEVEL);
1092
1093         /* flush command FIFOs */
1094         cdns_updatel(cdns, CDNS_MCP_CONTROL, CDNS_MCP_CONTROL_CMD_RST,
1095                      CDNS_MCP_CONTROL_CMD_RST);
1096
1097         /* Set cmd accept mode */
1098         cdns_updatel(cdns, CDNS_MCP_CONTROL, CDNS_MCP_CONTROL_CMD_ACCEPT,
1099                      CDNS_MCP_CONTROL_CMD_ACCEPT);
1100
1101         /* Configure mcp config */
1102         val = cdns_readl(cdns, CDNS_MCP_CONFIG);
1103
1104         /* enable bus operations with clock and data */
1105         val &= ~CDNS_MCP_CONFIG_OP;
1106         val |= CDNS_MCP_CONFIG_OP_NORMAL;
1107
1108         /* Set cmd mode for Tx and Rx cmds */
1109         val &= ~CDNS_MCP_CONFIG_CMD;
1110
1111         /* Disable sniffer mode */
1112         val &= ~CDNS_MCP_CONFIG_SNIFFER;
1113
1114         /* Disable auto bus release */
1115         val &= ~CDNS_MCP_CONFIG_BUS_REL;
1116
1117         if (cdns->bus.multi_link)
1118                 /* Set Multi-master mode to take gsync into account */
1119                 val |= CDNS_MCP_CONFIG_MMASTER;
1120
1121         /* leave frame delay to hardware default of 0x1F */
1122
1123         /* leave command retry to hardware default of 0 */
1124
1125         cdns_writel(cdns, CDNS_MCP_CONFIG, val);
1126
1127         /* changes will be committed later */
1128         return 0;
1129 }
1130 EXPORT_SYMBOL(sdw_cdns_init);
1131
1132 int cdns_bus_conf(struct sdw_bus *bus, struct sdw_bus_params *params)
1133 {
1134         struct sdw_master_prop *prop = &bus->prop;
1135         struct sdw_cdns *cdns = bus_to_cdns(bus);
1136         int mcp_clkctrl_off;
1137         int divider;
1138
1139         if (!params->curr_dr_freq) {
1140                 dev_err(cdns->dev, "NULL curr_dr_freq\n");
1141                 return -EINVAL;
1142         }
1143
1144         divider = prop->mclk_freq * SDW_DOUBLE_RATE_FACTOR /
1145                 params->curr_dr_freq;
1146         divider--; /* divider is 1/(N+1) */
1147
1148         if (params->next_bank)
1149                 mcp_clkctrl_off = CDNS_MCP_CLK_CTRL1;
1150         else
1151                 mcp_clkctrl_off = CDNS_MCP_CLK_CTRL0;
1152
1153         cdns_updatel(cdns, mcp_clkctrl_off, CDNS_MCP_CLK_MCLKD_MASK, divider);
1154
1155         return 0;
1156 }
1157 EXPORT_SYMBOL(cdns_bus_conf);
1158
1159 static int cdns_port_params(struct sdw_bus *bus,
1160                             struct sdw_port_params *p_params, unsigned int bank)
1161 {
1162         struct sdw_cdns *cdns = bus_to_cdns(bus);
1163         int dpn_config = 0, dpn_config_off;
1164
1165         if (bank)
1166                 dpn_config_off = CDNS_DPN_B1_CONFIG(p_params->num);
1167         else
1168                 dpn_config_off = CDNS_DPN_B0_CONFIG(p_params->num);
1169
1170         dpn_config = cdns_readl(cdns, dpn_config_off);
1171
1172         dpn_config |= ((p_params->bps - 1) <<
1173                                 SDW_REG_SHIFT(CDNS_DPN_CONFIG_WL));
1174         dpn_config |= (p_params->flow_mode <<
1175                                 SDW_REG_SHIFT(CDNS_DPN_CONFIG_PORT_FLOW));
1176         dpn_config |= (p_params->data_mode <<
1177                                 SDW_REG_SHIFT(CDNS_DPN_CONFIG_PORT_DAT));
1178
1179         cdns_writel(cdns, dpn_config_off, dpn_config);
1180
1181         return 0;
1182 }
1183
1184 static int cdns_transport_params(struct sdw_bus *bus,
1185                                  struct sdw_transport_params *t_params,
1186                                  enum sdw_reg_bank bank)
1187 {
1188         struct sdw_cdns *cdns = bus_to_cdns(bus);
1189         int dpn_offsetctrl = 0, dpn_offsetctrl_off;
1190         int dpn_config = 0, dpn_config_off;
1191         int dpn_hctrl = 0, dpn_hctrl_off;
1192         int num = t_params->port_num;
1193         int dpn_samplectrl_off;
1194
1195         /*
1196          * Note: Only full data port is supported on the Master side for
1197          * both PCM and PDM ports.
1198          */
1199
1200         if (bank) {
1201                 dpn_config_off = CDNS_DPN_B1_CONFIG(num);
1202                 dpn_samplectrl_off = CDNS_DPN_B1_SAMPLE_CTRL(num);
1203                 dpn_hctrl_off = CDNS_DPN_B1_HCTRL(num);
1204                 dpn_offsetctrl_off = CDNS_DPN_B1_OFFSET_CTRL(num);
1205         } else {
1206                 dpn_config_off = CDNS_DPN_B0_CONFIG(num);
1207                 dpn_samplectrl_off = CDNS_DPN_B0_SAMPLE_CTRL(num);
1208                 dpn_hctrl_off = CDNS_DPN_B0_HCTRL(num);
1209                 dpn_offsetctrl_off = CDNS_DPN_B0_OFFSET_CTRL(num);
1210         }
1211
1212         dpn_config = cdns_readl(cdns, dpn_config_off);
1213
1214         dpn_config |= (t_params->blk_grp_ctrl <<
1215                                 SDW_REG_SHIFT(CDNS_DPN_CONFIG_BGC));
1216         dpn_config |= (t_params->blk_pkg_mode <<
1217                                 SDW_REG_SHIFT(CDNS_DPN_CONFIG_BPM));
1218         cdns_writel(cdns, dpn_config_off, dpn_config);
1219
1220         dpn_offsetctrl |= (t_params->offset1 <<
1221                                 SDW_REG_SHIFT(CDNS_DPN_OFFSET_CTRL_1));
1222         dpn_offsetctrl |= (t_params->offset2 <<
1223                                 SDW_REG_SHIFT(CDNS_DPN_OFFSET_CTRL_2));
1224         cdns_writel(cdns, dpn_offsetctrl_off,  dpn_offsetctrl);
1225
1226         dpn_hctrl |= (t_params->hstart <<
1227                                 SDW_REG_SHIFT(CDNS_DPN_HCTRL_HSTART));
1228         dpn_hctrl |= (t_params->hstop << SDW_REG_SHIFT(CDNS_DPN_HCTRL_HSTOP));
1229         dpn_hctrl |= (t_params->lane_ctrl <<
1230                                 SDW_REG_SHIFT(CDNS_DPN_HCTRL_LCTRL));
1231
1232         cdns_writel(cdns, dpn_hctrl_off, dpn_hctrl);
1233         cdns_writel(cdns, dpn_samplectrl_off, (t_params->sample_interval - 1));
1234
1235         return 0;
1236 }
1237
1238 static int cdns_port_enable(struct sdw_bus *bus,
1239                             struct sdw_enable_ch *enable_ch, unsigned int bank)
1240 {
1241         struct sdw_cdns *cdns = bus_to_cdns(bus);
1242         int dpn_chnen_off, ch_mask;
1243
1244         if (bank)
1245                 dpn_chnen_off = CDNS_DPN_B1_CH_EN(enable_ch->port_num);
1246         else
1247                 dpn_chnen_off = CDNS_DPN_B0_CH_EN(enable_ch->port_num);
1248
1249         ch_mask = enable_ch->ch_mask * enable_ch->enable;
1250         cdns_writel(cdns, dpn_chnen_off, ch_mask);
1251
1252         return 0;
1253 }
1254
1255 static const struct sdw_master_port_ops cdns_port_ops = {
1256         .dpn_set_port_params = cdns_port_params,
1257         .dpn_set_port_transport_params = cdns_transport_params,
1258         .dpn_port_enable_ch = cdns_port_enable,
1259 };
1260
1261 /**
1262  * sdw_cdns_is_clock_stop: Check clock status
1263  *
1264  * @cdns: Cadence instance
1265  */
1266 bool sdw_cdns_is_clock_stop(struct sdw_cdns *cdns)
1267 {
1268         return !!(cdns_readl(cdns, CDNS_MCP_STAT) & CDNS_MCP_STAT_CLK_STOP);
1269 }
1270 EXPORT_SYMBOL(sdw_cdns_is_clock_stop);
1271
1272 /**
1273  * sdw_cdns_clock_stop: Cadence clock stop configuration routine
1274  *
1275  * @cdns: Cadence instance
1276  * @block_wake: prevent wakes if required by the platform
1277  */
1278 int sdw_cdns_clock_stop(struct sdw_cdns *cdns, bool block_wake)
1279 {
1280         bool slave_present = false;
1281         struct sdw_slave *slave;
1282         int ret;
1283
1284         /* Check suspend status */
1285         if (sdw_cdns_is_clock_stop(cdns)) {
1286                 dev_dbg(cdns->dev, "Clock is already stopped\n");
1287                 return 0;
1288         }
1289
1290         /*
1291          * Before entering clock stop we mask the Slave
1292          * interrupts. This helps avoid having to deal with e.g. a
1293          * Slave becoming UNATTACHED while the clock is being stopped
1294          */
1295         cdns_enable_slave_interrupts(cdns, false);
1296
1297         /*
1298          * For specific platforms, it is required to be able to put
1299          * master into a state in which it ignores wake-up trials
1300          * in clock stop state
1301          */
1302         if (block_wake)
1303                 cdns_updatel(cdns, CDNS_MCP_CONTROL,
1304                              CDNS_MCP_CONTROL_BLOCK_WAKEUP,
1305                              CDNS_MCP_CONTROL_BLOCK_WAKEUP);
1306
1307         list_for_each_entry(slave, &cdns->bus.slaves, node) {
1308                 if (slave->status == SDW_SLAVE_ATTACHED ||
1309                     slave->status == SDW_SLAVE_ALERT) {
1310                         slave_present = true;
1311                         break;
1312                 }
1313         }
1314
1315         /*
1316          * This CMD_ACCEPT should be used when there are no devices
1317          * attached on the link when entering clock stop mode. If this is
1318          * not set and there is a broadcast write then the command ignored
1319          * will be treated as a failure
1320          */
1321         if (!slave_present)
1322                 cdns_updatel(cdns, CDNS_MCP_CONTROL,
1323                              CDNS_MCP_CONTROL_CMD_ACCEPT,
1324                              CDNS_MCP_CONTROL_CMD_ACCEPT);
1325         else
1326                 cdns_updatel(cdns, CDNS_MCP_CONTROL,
1327                              CDNS_MCP_CONTROL_CMD_ACCEPT, 0);
1328
1329         /* commit changes */
1330         ret = cdns_config_update(cdns);
1331         if (ret < 0) {
1332                 dev_err(cdns->dev, "%s: config_update failed\n", __func__);
1333                 return ret;
1334         }
1335
1336         /* Prepare slaves for clock stop */
1337         ret = sdw_bus_prep_clk_stop(&cdns->bus);
1338         if (ret < 0) {
1339                 dev_err(cdns->dev, "prepare clock stop failed %d", ret);
1340                 return ret;
1341         }
1342
1343         /*
1344          * Enter clock stop mode and only report errors if there are
1345          * Slave devices present (ALERT or ATTACHED)
1346          */
1347         ret = sdw_bus_clk_stop(&cdns->bus);
1348         if (ret < 0 && slave_present && ret != -ENODATA) {
1349                 dev_err(cdns->dev, "bus clock stop failed %d", ret);
1350                 return ret;
1351         }
1352
1353         ret = cdns_set_wait(cdns, CDNS_MCP_STAT,
1354                             CDNS_MCP_STAT_CLK_STOP,
1355                             CDNS_MCP_STAT_CLK_STOP);
1356         if (ret < 0)
1357                 dev_err(cdns->dev, "Clock stop failed %d\n", ret);
1358
1359         return ret;
1360 }
1361 EXPORT_SYMBOL(sdw_cdns_clock_stop);
1362
1363 /**
1364  * sdw_cdns_clock_restart: Cadence PM clock restart configuration routine
1365  *
1366  * @cdns: Cadence instance
1367  * @bus_reset: context may be lost while in low power modes and the bus
1368  * may require a Severe Reset and re-enumeration after a wake.
1369  */
1370 int sdw_cdns_clock_restart(struct sdw_cdns *cdns, bool bus_reset)
1371 {
1372         int ret;
1373
1374         /* unmask Slave interrupts that were masked when stopping the clock */
1375         cdns_enable_slave_interrupts(cdns, true);
1376
1377         ret = cdns_clear_bit(cdns, CDNS_MCP_CONTROL,
1378                              CDNS_MCP_CONTROL_CLK_STOP_CLR);
1379         if (ret < 0) {
1380                 dev_err(cdns->dev, "Couldn't exit from clock stop\n");
1381                 return ret;
1382         }
1383
1384         ret = cdns_set_wait(cdns, CDNS_MCP_STAT, CDNS_MCP_STAT_CLK_STOP, 0);
1385         if (ret < 0) {
1386                 dev_err(cdns->dev, "clock stop exit failed %d\n", ret);
1387                 return ret;
1388         }
1389
1390         cdns_updatel(cdns, CDNS_MCP_CONTROL,
1391                      CDNS_MCP_CONTROL_BLOCK_WAKEUP, 0);
1392
1393         /*
1394          * clear CMD_ACCEPT so that the command ignored
1395          * will be treated as a failure during a broadcast write
1396          */
1397         cdns_updatel(cdns, CDNS_MCP_CONTROL, CDNS_MCP_CONTROL_CMD_ACCEPT, 0);
1398
1399         if (!bus_reset) {
1400
1401                 /* enable bus operations with clock and data */
1402                 cdns_updatel(cdns, CDNS_MCP_CONFIG,
1403                              CDNS_MCP_CONFIG_OP,
1404                              CDNS_MCP_CONFIG_OP_NORMAL);
1405
1406                 ret = cdns_config_update(cdns);
1407                 if (ret < 0) {
1408                         dev_err(cdns->dev, "%s: config_update failed\n", __func__);
1409                         return ret;
1410                 }
1411
1412                 ret = sdw_bus_exit_clk_stop(&cdns->bus);
1413                 if (ret < 0)
1414                         dev_err(cdns->dev, "bus failed to exit clock stop %d\n", ret);
1415         }
1416
1417         return ret;
1418 }
1419 EXPORT_SYMBOL(sdw_cdns_clock_restart);
1420
1421 /**
1422  * sdw_cdns_probe() - Cadence probe routine
1423  * @cdns: Cadence instance
1424  */
1425 int sdw_cdns_probe(struct sdw_cdns *cdns)
1426 {
1427         init_completion(&cdns->tx_complete);
1428         cdns->bus.port_ops = &cdns_port_ops;
1429
1430         return 0;
1431 }
1432 EXPORT_SYMBOL(sdw_cdns_probe);
1433
1434 int cdns_set_sdw_stream(struct snd_soc_dai *dai,
1435                         void *stream, bool pcm, int direction)
1436 {
1437         struct sdw_cdns *cdns = snd_soc_dai_get_drvdata(dai);
1438         struct sdw_cdns_dma_data *dma;
1439
1440         dma = kzalloc(sizeof(*dma), GFP_KERNEL);
1441         if (!dma)
1442                 return -ENOMEM;
1443
1444         if (pcm)
1445                 dma->stream_type = SDW_STREAM_PCM;
1446         else
1447                 dma->stream_type = SDW_STREAM_PDM;
1448
1449         dma->bus = &cdns->bus;
1450         dma->link_id = cdns->instance;
1451
1452         dma->stream = stream;
1453
1454         if (direction == SNDRV_PCM_STREAM_PLAYBACK)
1455                 dai->playback_dma_data = dma;
1456         else
1457                 dai->capture_dma_data = dma;
1458
1459         return 0;
1460 }
1461 EXPORT_SYMBOL(cdns_set_sdw_stream);
1462
1463 /**
1464  * cdns_find_pdi() - Find a free PDI
1465  *
1466  * @cdns: Cadence instance
1467  * @offset: Starting offset
1468  * @num: Number of PDIs
1469  * @pdi: PDI instances
1470  * @dai_id: DAI id
1471  *
1472  * Find a PDI for a given PDI array. The PDI num and dai_id are
1473  * expected to match, return NULL otherwise.
1474  */
1475 static struct sdw_cdns_pdi *cdns_find_pdi(struct sdw_cdns *cdns,
1476                                           unsigned int offset,
1477                                           unsigned int num,
1478                                           struct sdw_cdns_pdi *pdi,
1479                                           int dai_id)
1480 {
1481         int i;
1482
1483         for (i = offset; i < offset + num; i++)
1484                 if (pdi[i].num == dai_id)
1485                         return &pdi[i];
1486
1487         return NULL;
1488 }
1489
1490 /**
1491  * sdw_cdns_config_stream: Configure a stream
1492  *
1493  * @cdns: Cadence instance
1494  * @ch: Channel count
1495  * @dir: Data direction
1496  * @pdi: PDI to be used
1497  */
1498 void sdw_cdns_config_stream(struct sdw_cdns *cdns,
1499                             u32 ch, u32 dir, struct sdw_cdns_pdi *pdi)
1500 {
1501         u32 offset, val = 0;
1502
1503         if (dir == SDW_DATA_DIR_RX)
1504                 val = CDNS_PORTCTRL_DIRN;
1505
1506         offset = CDNS_PORTCTRL + pdi->num * CDNS_PORT_OFFSET;
1507         cdns_updatel(cdns, offset, CDNS_PORTCTRL_DIRN, val);
1508
1509         val = pdi->num;
1510         val |= CDNS_PDI_CONFIG_SOFT_RESET;
1511         val |= ((1 << ch) - 1) << SDW_REG_SHIFT(CDNS_PDI_CONFIG_CHANNEL);
1512         cdns_writel(cdns, CDNS_PDI_CONFIG(pdi->num), val);
1513 }
1514 EXPORT_SYMBOL(sdw_cdns_config_stream);
1515
1516 /**
1517  * sdw_cdns_alloc_pdi() - Allocate a PDI
1518  *
1519  * @cdns: Cadence instance
1520  * @stream: Stream to be allocated
1521  * @ch: Channel count
1522  * @dir: Data direction
1523  * @dai_id: DAI id
1524  */
1525 struct sdw_cdns_pdi *sdw_cdns_alloc_pdi(struct sdw_cdns *cdns,
1526                                         struct sdw_cdns_streams *stream,
1527                                         u32 ch, u32 dir, int dai_id)
1528 {
1529         struct sdw_cdns_pdi *pdi = NULL;
1530
1531         if (dir == SDW_DATA_DIR_RX)
1532                 pdi = cdns_find_pdi(cdns, 0, stream->num_in, stream->in,
1533                                     dai_id);
1534         else
1535                 pdi = cdns_find_pdi(cdns, 0, stream->num_out, stream->out,
1536                                     dai_id);
1537
1538         /* check if we found a PDI, else find in bi-directional */
1539         if (!pdi)
1540                 pdi = cdns_find_pdi(cdns, 2, stream->num_bd, stream->bd,
1541                                     dai_id);
1542
1543         if (pdi) {
1544                 pdi->l_ch_num = 0;
1545                 pdi->h_ch_num = ch - 1;
1546                 pdi->dir = dir;
1547                 pdi->ch_count = ch;
1548         }
1549
1550         return pdi;
1551 }
1552 EXPORT_SYMBOL(sdw_cdns_alloc_pdi);
1553
1554 MODULE_LICENSE("Dual BSD/GPL");
1555 MODULE_DESCRIPTION("Cadence Soundwire Library");