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 <linux/workqueue.h>
  21 #include "bus.h"
  22 #include "cadence_master.h"
  23
  24 static int interrupt_mask;
  25 module_param_named(cnds_mcp_int_mask, interrupt_mask, int, 0444);
  26 MODULE_PARM_DESC(cdns_mcp_int_mask, "Cadence MCP IntMask");
  27
  28 #define CDNS_MCP_CONFIG                         0x0
  29
  30 #define CDNS_MCP_CONFIG_MCMD_RETRY              GENMASK(27, 24)
  31 #define CDNS_MCP_CONFIG_MPREQ_DELAY             GENMASK(20, 16)
  32 #define CDNS_MCP_CONFIG_MMASTER                 BIT(7)
  33 #define CDNS_MCP_CONFIG_BUS_REL                 BIT(6)
  34 #define CDNS_MCP_CONFIG_SNIFFER                 BIT(5)
  35 #define CDNS_MCP_CONFIG_SSPMOD                  BIT(4)
  36 #define CDNS_MCP_CONFIG_CMD                     BIT(3)
  37 #define CDNS_MCP_CONFIG_OP                      GENMASK(2, 0)
  38 #define CDNS_MCP_CONFIG_OP_NORMAL               0
  39
  40 #define CDNS_MCP_CONTROL                        0x4
  41
  42 #define CDNS_MCP_CONTROL_RST_DELAY              GENMASK(10, 8)
  43 #define CDNS_MCP_CONTROL_CMD_RST                BIT(7)
  44 #define CDNS_MCP_CONTROL_SOFT_RST               BIT(6)
  45 #define CDNS_MCP_CONTROL_SW_RST                 BIT(5)
  46 #define CDNS_MCP_CONTROL_HW_RST                 BIT(4)
  47 #define CDNS_MCP_CONTROL_CLK_PAUSE              BIT(3)
  48 #define CDNS_MCP_CONTROL_CLK_STOP_CLR           BIT(2)
  49 #define CDNS_MCP_CONTROL_CMD_ACCEPT             BIT(1)
  50 #define CDNS_MCP_CONTROL_BLOCK_WAKEUP           BIT(0)
  51
  52 #define CDNS_MCP_CMDCTRL                        0x8
  53 #define CDNS_MCP_SSPSTAT                        0xC
  54 #define CDNS_MCP_FRAME_SHAPE                    0x10
  55 #define CDNS_MCP_FRAME_SHAPE_INIT               0x14
  56 #define CDNS_MCP_FRAME_SHAPE_COL_MASK           GENMASK(2, 0)
  57 #define CDNS_MCP_FRAME_SHAPE_ROW_OFFSET         3
  58
  59 #define CDNS_MCP_CONFIG_UPDATE                  0x18
  60 #define CDNS_MCP_CONFIG_UPDATE_BIT              BIT(0)
  61
  62 #define CDNS_MCP_PHYCTRL                        0x1C
  63 #define CDNS_MCP_SSP_CTRL0                      0x20
  64 #define CDNS_MCP_SSP_CTRL1                      0x28
  65 #define CDNS_MCP_CLK_CTRL0                      0x30
  66 #define CDNS_MCP_CLK_CTRL1                      0x38
  67 #define CDNS_MCP_CLK_MCLKD_MASK         GENMASK(7, 0)
  68
  69 #define CDNS_MCP_STAT                           0x40
  70
  71 #define CDNS_MCP_STAT_ACTIVE_BANK               BIT(20)
  72 #define CDNS_MCP_STAT_CLK_STOP                  BIT(16)
  73
  74 #define CDNS_MCP_INTSTAT                        0x44
  75 #define CDNS_MCP_INTMASK                        0x48
  76
  77 #define CDNS_MCP_INT_IRQ                        BIT(31)
  78 #define CDNS_MCP_INT_RESERVED1                  GENMASK(30, 17)
  79 #define CDNS_MCP_INT_WAKEUP                     BIT(16)
  80 #define CDNS_MCP_INT_SLAVE_RSVD                 BIT(15)
  81 #define CDNS_MCP_INT_SLAVE_ALERT                BIT(14)
  82 #define CDNS_MCP_INT_SLAVE_ATTACH               BIT(13)
  83 #define CDNS_MCP_INT_SLAVE_NATTACH              BIT(12)
  84 #define CDNS_MCP_INT_SLAVE_MASK                 GENMASK(15, 12)
  85 #define CDNS_MCP_INT_DPINT                      BIT(11)
  86 #define CDNS_MCP_INT_CTRL_CLASH                 BIT(10)
  87 #define CDNS_MCP_INT_DATA_CLASH                 BIT(9)
  88 #define CDNS_MCP_INT_PARITY                     BIT(8)
  89 #define CDNS_MCP_INT_CMD_ERR                    BIT(7)
  90 #define CDNS_MCP_INT_RESERVED2                  GENMASK(6, 4)
  91 #define CDNS_MCP_INT_RX_NE                      BIT(3)
  92 #define CDNS_MCP_INT_RX_WL                      BIT(2)
  93 #define CDNS_MCP_INT_TXE                        BIT(1)
  94 #define CDNS_MCP_INT_TXF                        BIT(0)
  95 #define CDNS_MCP_INT_RESERVED (CDNS_MCP_INT_RESERVED1 | CDNS_MCP_INT_RESERVED2)
  96
  97 #define CDNS_MCP_INTSET                         0x4C
  98
  99 #define CDNS_MCP_SLAVE_STAT                     0x50
 100 #define CDNS_MCP_SLAVE_STAT_MASK                GENMASK(1, 0)
 101
 102 #define CDNS_MCP_SLAVE_INTSTAT0                 0x54
 103 #define CDNS_MCP_SLAVE_INTSTAT1                 0x58
 104 #define CDNS_MCP_SLAVE_INTSTAT_NPRESENT         BIT(0)
 105 #define CDNS_MCP_SLAVE_INTSTAT_ATTACHED         BIT(1)
 106 #define CDNS_MCP_SLAVE_INTSTAT_ALERT            BIT(2)
 107 #define CDNS_MCP_SLAVE_INTSTAT_RESERVED         BIT(3)
 108 #define CDNS_MCP_SLAVE_STATUS_BITS              GENMASK(3, 0)
 109 #define CDNS_MCP_SLAVE_STATUS_NUM               4
 110
 111 #define CDNS_MCP_SLAVE_INTMASK0                 0x5C
 112 #define CDNS_MCP_SLAVE_INTMASK1                 0x60
 113
 114 #define CDNS_MCP_SLAVE_INTMASK0_MASK            GENMASK(31, 0)
 115 #define CDNS_MCP_SLAVE_INTMASK1_MASK            GENMASK(15, 0)
 116
 117 #define CDNS_MCP_PORT_INTSTAT                   0x64
 118 #define CDNS_MCP_PDI_STAT                       0x6C
 119
 120 #define CDNS_MCP_FIFOLEVEL                      0x78
 121 #define CDNS_MCP_FIFOSTAT                       0x7C
 122 #define CDNS_MCP_RX_FIFO_AVAIL                  GENMASK(5, 0)
 123
 124 #define CDNS_MCP_CMD_BASE                       0x80
 125 #define CDNS_MCP_RESP_BASE                      0x80
 126 #define CDNS_MCP_CMD_LEN                        0x20
 127 #define CDNS_MCP_CMD_WORD_LEN                   0x4
 128
 129 #define CDNS_MCP_CMD_SSP_TAG                    BIT(31)
 130 #define CDNS_MCP_CMD_COMMAND                    GENMASK(30, 28)
 131 #define CDNS_MCP_CMD_DEV_ADDR                   GENMASK(27, 24)
 132 #define CDNS_MCP_CMD_REG_ADDR_H                 GENMASK(23, 16)
 133 #define CDNS_MCP_CMD_REG_ADDR_L                 GENMASK(15, 8)
 134 #define CDNS_MCP_CMD_REG_DATA                   GENMASK(7, 0)
 135
 136 #define CDNS_MCP_CMD_READ                       2
 137 #define CDNS_MCP_CMD_WRITE                      3
 138
 139 #define CDNS_MCP_RESP_RDATA                     GENMASK(15, 8)
 140 #define CDNS_MCP_RESP_ACK                       BIT(0)
 141 #define CDNS_MCP_RESP_NACK                      BIT(1)
 142
 143 #define CDNS_DP_SIZE                            128
 144
 145 #define CDNS_DPN_B0_CONFIG(n)                   (0x100 + CDNS_DP_SIZE * (n))
 146 #define CDNS_DPN_B0_CH_EN(n)                    (0x104 + CDNS_DP_SIZE * (n))
 147 #define CDNS_DPN_B0_SAMPLE_CTRL(n)              (0x108 + CDNS_DP_SIZE * (n))
 148 #define CDNS_DPN_B0_OFFSET_CTRL(n)              (0x10C + CDNS_DP_SIZE * (n))
 149 #define CDNS_DPN_B0_HCTRL(n)                    (0x110 + CDNS_DP_SIZE * (n))
 150 #define CDNS_DPN_B0_ASYNC_CTRL(n)               (0x114 + CDNS_DP_SIZE * (n))
 151
 152 #define CDNS_DPN_B1_CONFIG(n)                   (0x118 + CDNS_DP_SIZE * (n))
 153 #define CDNS_DPN_B1_CH_EN(n)                    (0x11C + CDNS_DP_SIZE * (n))
 154 #define CDNS_DPN_B1_SAMPLE_CTRL(n)              (0x120 + CDNS_DP_SIZE * (n))
 155 #define CDNS_DPN_B1_OFFSET_CTRL(n)              (0x124 + CDNS_DP_SIZE * (n))
 156 #define CDNS_DPN_B1_HCTRL(n)                    (0x128 + CDNS_DP_SIZE * (n))
 157 #define CDNS_DPN_B1_ASYNC_CTRL(n)               (0x12C + CDNS_DP_SIZE * (n))
 158
 159 #define CDNS_DPN_CONFIG_BPM                     BIT(18)
 160 #define CDNS_DPN_CONFIG_BGC                     GENMASK(17, 16)
 161 #define CDNS_DPN_CONFIG_WL                      GENMASK(12, 8)
 162 #define CDNS_DPN_CONFIG_PORT_DAT                GENMASK(3, 2)
 163 #define CDNS_DPN_CONFIG_PORT_FLOW               GENMASK(1, 0)
 164
 165 #define CDNS_DPN_SAMPLE_CTRL_SI                 GENMASK(15, 0)
 166
 167 #define CDNS_DPN_OFFSET_CTRL_1                  GENMASK(7, 0)
 168 #define CDNS_DPN_OFFSET_CTRL_2                  GENMASK(15, 8)
 169
 170 #define CDNS_DPN_HCTRL_HSTOP                    GENMASK(3, 0)
 171 #define CDNS_DPN_HCTRL_HSTART                   GENMASK(7, 4)
 172 #define CDNS_DPN_HCTRL_LCTRL                    GENMASK(10, 8)
 173
 174 #define CDNS_PORTCTRL                           0x130
 175 #define CDNS_PORTCTRL_DIRN                      BIT(7)
 176 #define CDNS_PORTCTRL_BANK_INVERT               BIT(8)
 177
 178 #define CDNS_PORT_OFFSET                        0x80
 179
 180 #define CDNS_PDI_CONFIG(n)                      (0x1100 + (n) * 16)
 181
 182 #define CDNS_PDI_CONFIG_SOFT_RESET              BIT(24)
 183 #define CDNS_PDI_CONFIG_CHANNEL                 GENMASK(15, 8)
 184 #define CDNS_PDI_CONFIG_PORT                    GENMASK(4, 0)
 185
 186 /* Driver defaults */
 187 #define CDNS_TX_TIMEOUT                         2000
 188
 189 #define CDNS_SCP_RX_FIFOLEVEL                   0x2
 190
 191 /*
 192  * register accessor helpers
 193  */
 194 static inline u32 cdns_readl(struct sdw_cdns *cdns, int offset)
 195 {
 196         return readl(cdns->registers + offset);
 197 }
 198
 199 static inline void cdns_writel(struct sdw_cdns *cdns, int offset, u32 value)
 200 {
 201         writel(value, cdns->registers + offset);
 202 }
 203
 204 static inline void cdns_updatel(struct sdw_cdns *cdns,
 205                                 int offset, u32 mask, u32 val)
 206 {
 207         u32 tmp;
 208
 209         tmp = cdns_readl(cdns, offset);
 210         tmp = (tmp & ~mask) | val;
 211         cdns_writel(cdns, offset, tmp);
 212 }
 213
 214 static int cdns_set_wait(struct sdw_cdns *cdns, int offset, u32 mask, u32 value)
 215 {
 216         int timeout = 10;
 217         u32 reg_read;
 218
 219         /* Wait for bit to be set */
 220         do {
 221                 reg_read = readl(cdns->registers + offset);
 222                 if ((reg_read & mask) == value)
 223                         return 0;
 224
 225                 timeout--;
 226                 usleep_range(50, 100);
 227         } while (timeout != 0);
 228
 229         return -ETIMEDOUT;
 230 }
 231
 232 static int cdns_clear_bit(struct sdw_cdns *cdns, int offset, u32 value)
 233 {
 234         writel(value, cdns->registers + offset);
 235
 236         /* Wait for bit to be self cleared */
 237         return cdns_set_wait(cdns, offset, value, 0);
 238 }
 239
 240 /*
 241  * all changes to the MCP_CONFIG, MCP_CONTROL, MCP_CMDCTRL and MCP_PHYCTRL
 242  * need to be confirmed with a write to MCP_CONFIG_UPDATE
 243  */
 244 static int cdns_config_update(struct sdw_cdns *cdns)
 245 {
 246         int ret;
 247
 248         if (sdw_cdns_is_clock_stop(cdns)) {
 249                 dev_err(cdns->dev, "Cannot program MCP_CONFIG_UPDATE in ClockStopMode\n");
 250                 return -EINVAL;
 251         }
 252
 253         ret = cdns_clear_bit(cdns, CDNS_MCP_CONFIG_UPDATE,
 254                              CDNS_MCP_CONFIG_UPDATE_BIT);
 255         if (ret < 0)
 256                 dev_err(cdns->dev, "Config update timedout\n");
 257
 258         return ret;
 259 }
 260
 261 /*
 262  * debugfs
 263  */
 264 #ifdef CONFIG_DEBUG_FS
 265
 266 #define RD_BUF (2 * PAGE_SIZE)
 267
 268 static ssize_t cdns_sprintf(struct sdw_cdns *cdns,
 269                             char *buf, size_t pos, unsigned int reg)
 270 {
 271         return scnprintf(buf + pos, RD_BUF - pos,
 272                          "%4x\t%8x\n", reg, cdns_readl(cdns, reg));
 273 }
 274
 275 static int cdns_reg_show(struct seq_file *s, void *data)
 276 {
 277         struct sdw_cdns *cdns = s->private;
 278         char *buf;
 279         ssize_t ret;
 280         int num_ports;
 281         int i, j;
 282
 283         buf = kzalloc(RD_BUF, GFP_KERNEL);
 284         if (!buf)
 285                 return -ENOMEM;
 286
 287         ret = scnprintf(buf, RD_BUF, "Register  Value\n");
 288         ret += scnprintf(buf + ret, RD_BUF - ret, "\nMCP Registers\n");
 289         /* 8 MCP registers */
 290         for (i = CDNS_MCP_CONFIG; i <= CDNS_MCP_PHYCTRL; i += sizeof(u32))
 291                 ret += cdns_sprintf(cdns, buf, ret, i);
 292
 293         ret += scnprintf(buf + ret, RD_BUF - ret,
 294                          "\nStatus & Intr Registers\n");
 295         /* 13 Status & Intr registers (offsets 0x70 and 0x74 not defined) */
 296         for (i = CDNS_MCP_STAT; i <=  CDNS_MCP_FIFOSTAT; i += sizeof(u32))
 297                 ret += cdns_sprintf(cdns, buf, ret, i);
 298
 299         ret += scnprintf(buf + ret, RD_BUF - ret,
 300                          "\nSSP & Clk ctrl Registers\n");
 301         ret += cdns_sprintf(cdns, buf, ret, CDNS_MCP_SSP_CTRL0);
 302         ret += cdns_sprintf(cdns, buf, ret, CDNS_MCP_SSP_CTRL1);
 303         ret += cdns_sprintf(cdns, buf, ret, CDNS_MCP_CLK_CTRL0);
 304         ret += cdns_sprintf(cdns, buf, ret, CDNS_MCP_CLK_CTRL1);
 305
 306         ret += scnprintf(buf + ret, RD_BUF - ret,
 307                          "\nDPn B0 Registers\n");
 308
 309         num_ports = cdns->num_ports;
 310
 311         for (i = 0; i < num_ports; i++) {
 312                 ret += scnprintf(buf + ret, RD_BUF - ret,
 313                                  "\nDP-%d\n", i);
 314                 for (j = CDNS_DPN_B0_CONFIG(i);
 315                      j < CDNS_DPN_B0_ASYNC_CTRL(i); j += sizeof(u32))
 316                         ret += cdns_sprintf(cdns, buf, ret, j);
 317         }
 318
 319         ret += scnprintf(buf + ret, RD_BUF - ret,
 320                          "\nDPn B1 Registers\n");
 321         for (i = 0; i < num_ports; i++) {
 322                 ret += scnprintf(buf + ret, RD_BUF - ret,
 323                                  "\nDP-%d\n", i);
 324
 325                 for (j = CDNS_DPN_B1_CONFIG(i);
 326                      j < CDNS_DPN_B1_ASYNC_CTRL(i); j += sizeof(u32))
 327                         ret += cdns_sprintf(cdns, buf, ret, j);
 328         }
 329
 330         ret += scnprintf(buf + ret, RD_BUF - ret,
 331                          "\nDPn Control Registers\n");
 332         for (i = 0; i < num_ports; i++)
 333                 ret += cdns_sprintf(cdns, buf, ret,
 334                                 CDNS_PORTCTRL + i * CDNS_PORT_OFFSET);
 335
 336         ret += scnprintf(buf + ret, RD_BUF - ret,
 337                          "\nPDIn Config Registers\n");
 338
 339         /* number of PDI and ports is interchangeable */
 340         for (i = 0; i < num_ports; i++)
 341                 ret += cdns_sprintf(cdns, buf, ret, CDNS_PDI_CONFIG(i));
 342
 343         seq_printf(s, "%s", buf);
 344         kfree(buf);
 345
 346         return 0;
 347 }
 348 DEFINE_SHOW_ATTRIBUTE(cdns_reg);
 349
 350 static int cdns_hw_reset(void *data, u64 value)
 351 {
 352         struct sdw_cdns *cdns = data;
 353         int ret;
 354
 355         if (value != 1)
 356                 return -EINVAL;
 357
 358         /* Userspace changed the hardware state behind the kernel's back */
 359         add_taint(TAINT_USER, LOCKDEP_STILL_OK);
 360
 361         ret = sdw_cdns_exit_reset(cdns);
 362
 363         dev_dbg(cdns->dev, "link hw_reset done: %d\n", ret);
 364
 365         return ret;
 366 }
 367
 368 DEFINE_DEBUGFS_ATTRIBUTE(cdns_hw_reset_fops, NULL, cdns_hw_reset, "%llu\n");
 369
 370 /**
 371  * sdw_cdns_debugfs_init() - Cadence debugfs init
 372  * @cdns: Cadence instance
 373  * @root: debugfs root
 374  */
 375 void sdw_cdns_debugfs_init(struct sdw_cdns *cdns, struct dentry *root)
 376 {
 377         debugfs_create_file("cdns-registers", 0400, root, cdns, &cdns_reg_fops);
 378
 379         debugfs_create_file("cdns-hw-reset", 0200, root, cdns,
 380                             &cdns_hw_reset_fops);
 381 }
 382 EXPORT_SYMBOL_GPL(sdw_cdns_debugfs_init);
 383
 384 #endif /* CONFIG_DEBUG_FS */
 385
 386 /*
 387  * IO Calls
 388  */
 389 static enum sdw_command_response
 390 cdns_fill_msg_resp(struct sdw_cdns *cdns,
 391                    struct sdw_msg *msg, int count, int offset)
 392 {
 393         int nack = 0, no_ack = 0;
 394         int i;
 395
 396         /* check message response */
 397         for (i = 0; i < count; i++) {
 398                 if (!(cdns->response_buf[i] & CDNS_MCP_RESP_ACK)) {
 399                         no_ack = 1;
 400                         dev_dbg_ratelimited(cdns->dev, "Msg Ack not received\n");
 401                         if (cdns->response_buf[i] & CDNS_MCP_RESP_NACK) {
 402                                 nack = 1;
 403                                 dev_err_ratelimited(cdns->dev, "Msg NACK received\n");
 404                         }
 405                 }
 406         }
 407
 408         if (nack) {
 409                 dev_err_ratelimited(cdns->dev, "Msg NACKed for Slave %d\n", msg->dev_num);
 410                 return SDW_CMD_FAIL;
 411         }
 412
 413         if (no_ack) {
 414                 dev_dbg_ratelimited(cdns->dev, "Msg ignored for Slave %d\n", msg->dev_num);
 415                 return SDW_CMD_IGNORED;
 416         }
 417
 418         /* fill response */
 419         for (i = 0; i < count; i++)
 420                 msg->buf[i + offset] = cdns->response_buf[i] >>
 421                                 SDW_REG_SHIFT(CDNS_MCP_RESP_RDATA);
 422
 423         return SDW_CMD_OK;
 424 }
 425
 426 static enum sdw_command_response
 427 _cdns_xfer_msg(struct sdw_cdns *cdns, struct sdw_msg *msg, int cmd,
 428                int offset, int count, bool defer)
 429 {
 430         unsigned long time;
 431         u32 base, i, data;
 432         u16 addr;
 433
 434         /* Program the watermark level for RX FIFO */
 435         if (cdns->msg_count != count) {
 436                 cdns_writel(cdns, CDNS_MCP_FIFOLEVEL, count);
 437                 cdns->msg_count = count;
 438         }
 439
 440         base = CDNS_MCP_CMD_BASE;
 441         addr = msg->addr;
 442
 443         for (i = 0; i < count; i++) {
 444                 data = msg->dev_num << SDW_REG_SHIFT(CDNS_MCP_CMD_DEV_ADDR);
 445                 data |= cmd << SDW_REG_SHIFT(CDNS_MCP_CMD_COMMAND);
 446                 data |= addr++  << SDW_REG_SHIFT(CDNS_MCP_CMD_REG_ADDR_L);
 447
 448                 if (msg->flags == SDW_MSG_FLAG_WRITE)
 449                         data |= msg->buf[i + offset];
 450
 451                 data |= msg->ssp_sync << SDW_REG_SHIFT(CDNS_MCP_CMD_SSP_TAG);
 452                 cdns_writel(cdns, base, data);
 453                 base += CDNS_MCP_CMD_WORD_LEN;
 454         }
 455
 456         if (defer)
 457                 return SDW_CMD_OK;
 458
 459         /* wait for timeout or response */
 460         time = wait_for_completion_timeout(&cdns->tx_complete,
 461                                            msecs_to_jiffies(CDNS_TX_TIMEOUT));
 462         if (!time) {
 463                 dev_err(cdns->dev, "IO transfer timed out, cmd %d device %d addr %x len %d\n",
 464                         cmd, msg->dev_num, msg->addr, msg->len);
 465                 msg->len = 0;
 466                 return SDW_CMD_TIMEOUT;
 467         }
 468
 469         return cdns_fill_msg_resp(cdns, msg, count, offset);
 470 }
 471
 472 static enum sdw_command_response
 473 cdns_program_scp_addr(struct sdw_cdns *cdns, struct sdw_msg *msg)
 474 {
 475         int nack = 0, no_ack = 0;
 476         unsigned long time;
 477         u32 data[2], base;
 478         int i;
 479
 480         /* Program the watermark level for RX FIFO */
 481         if (cdns->msg_count != CDNS_SCP_RX_FIFOLEVEL) {
 482                 cdns_writel(cdns, CDNS_MCP_FIFOLEVEL, CDNS_SCP_RX_FIFOLEVEL);
 483                 cdns->msg_count = CDNS_SCP_RX_FIFOLEVEL;
 484         }
 485
 486         data[0] = msg->dev_num << SDW_REG_SHIFT(CDNS_MCP_CMD_DEV_ADDR);
 487         data[0] |= 0x3 << SDW_REG_SHIFT(CDNS_MCP_CMD_COMMAND);
 488         data[1] = data[0];
 489
 490         data[0] |= SDW_SCP_ADDRPAGE1 << SDW_REG_SHIFT(CDNS_MCP_CMD_REG_ADDR_L);
 491         data[1] |= SDW_SCP_ADDRPAGE2 << SDW_REG_SHIFT(CDNS_MCP_CMD_REG_ADDR_L);
 492
 493         data[0] |= msg->addr_page1;
 494         data[1] |= msg->addr_page2;
 495
 496         base = CDNS_MCP_CMD_BASE;
 497         cdns_writel(cdns, base, data[0]);
 498         base += CDNS_MCP_CMD_WORD_LEN;
 499         cdns_writel(cdns, base, data[1]);
 500
 501         time = wait_for_completion_timeout(&cdns->tx_complete,
 502                                            msecs_to_jiffies(CDNS_TX_TIMEOUT));
 503         if (!time) {
 504                 dev_err(cdns->dev, "SCP Msg trf timed out\n");
 505                 msg->len = 0;
 506                 return SDW_CMD_TIMEOUT;
 507         }
 508
 509         /* check response the writes */
 510         for (i = 0; i < 2; i++) {
 511                 if (!(cdns->response_buf[i] & CDNS_MCP_RESP_ACK)) {
 512                         no_ack = 1;
 513                         dev_err(cdns->dev, "Program SCP Ack not received\n");
 514                         if (cdns->response_buf[i] & CDNS_MCP_RESP_NACK) {
 515                                 nack = 1;
 516                                 dev_err(cdns->dev, "Program SCP NACK received\n");
 517                         }
 518                 }
 519         }
 520
 521         /* For NACK, NO ack, don't return err if we are in Broadcast mode */
 522         if (nack) {
 523                 dev_err_ratelimited(cdns->dev,
 524                                     "SCP_addrpage NACKed for Slave %d\n", msg->dev_num);
 525                 return SDW_CMD_FAIL;
 526         }
 527
 528         if (no_ack) {
 529                 dev_dbg_ratelimited(cdns->dev,
 530                                     "SCP_addrpage ignored for Slave %d\n", msg->dev_num);
 531                 return SDW_CMD_IGNORED;
 532         }
 533
 534         return SDW_CMD_OK;
 535 }
 536
 537 static int cdns_prep_msg(struct sdw_cdns *cdns, struct sdw_msg *msg, int *cmd)
 538 {
 539         int ret;
 540
 541         if (msg->page) {
 542                 ret = cdns_program_scp_addr(cdns, msg);
 543                 if (ret) {
 544                         msg->len = 0;
 545                         return ret;
 546                 }
 547         }
 548
 549         switch (msg->flags) {
 550         case SDW_MSG_FLAG_READ:
 551                 *cmd = CDNS_MCP_CMD_READ;
 552                 break;
 553
 554         case SDW_MSG_FLAG_WRITE:
 555                 *cmd = CDNS_MCP_CMD_WRITE;
 556                 break;
 557
 558         default:
 559                 dev_err(cdns->dev, "Invalid msg cmd: %d\n", msg->flags);
 560                 return -EINVAL;
 561         }
 562
 563         return 0;
 564 }
 565
 566 enum sdw_command_response
 567 cdns_xfer_msg(struct sdw_bus *bus, struct sdw_msg *msg)
 568 {
 569         struct sdw_cdns *cdns = bus_to_cdns(bus);
 570         int cmd = 0, ret, i;
 571
 572         ret = cdns_prep_msg(cdns, msg, &cmd);
 573         if (ret)
 574                 return SDW_CMD_FAIL_OTHER;
 575
 576         for (i = 0; i < msg->len / CDNS_MCP_CMD_LEN; i++) {
 577                 ret = _cdns_xfer_msg(cdns, msg, cmd, i * CDNS_MCP_CMD_LEN,
 578                                      CDNS_MCP_CMD_LEN, false);
 579                 if (ret < 0)
 580                         goto exit;
 581         }
 582
 583         if (!(msg->len % CDNS_MCP_CMD_LEN))
 584                 goto exit;
 585
 586         ret = _cdns_xfer_msg(cdns, msg, cmd, i * CDNS_MCP_CMD_LEN,
 587                              msg->len % CDNS_MCP_CMD_LEN, false);
 588
 589 exit:
 590         return ret;
 591 }
 592 EXPORT_SYMBOL(cdns_xfer_msg);
 593
 594 enum sdw_command_response
 595 cdns_xfer_msg_defer(struct sdw_bus *bus,
 596                     struct sdw_msg *msg, struct sdw_defer *defer)
 597 {
 598         struct sdw_cdns *cdns = bus_to_cdns(bus);
 599         int cmd = 0, ret;
 600
 601         /* for defer only 1 message is supported */
 602         if (msg->len > 1)
 603                 return -ENOTSUPP;
 604
 605         ret = cdns_prep_msg(cdns, msg, &cmd);
 606         if (ret)
 607                 return SDW_CMD_FAIL_OTHER;
 608
 609         cdns->defer = defer;
 610         cdns->defer->length = msg->len;
 611
 612         return _cdns_xfer_msg(cdns, msg, cmd, 0, msg->len, true);
 613 }
 614 EXPORT_SYMBOL(cdns_xfer_msg_defer);
 615
 616 enum sdw_command_response
 617 cdns_reset_page_addr(struct sdw_bus *bus, unsigned int dev_num)
 618 {
 619         struct sdw_cdns *cdns = bus_to_cdns(bus);
 620         struct sdw_msg msg;
 621
 622         /* Create dummy message with valid device number */
 623         memset(&msg, 0, sizeof(msg));
 624         msg.dev_num = dev_num;
 625
 626         return cdns_program_scp_addr(cdns, &msg);
 627 }
 628 EXPORT_SYMBOL(cdns_reset_page_addr);
 629
 630 /*
 631  * IRQ handling
 632  */
 633
 634 static void cdns_read_response(struct sdw_cdns *cdns)
 635 {
 636         u32 num_resp, cmd_base;
 637         int i;
 638
 639         num_resp = cdns_readl(cdns, CDNS_MCP_FIFOSTAT);
 640         num_resp &= CDNS_MCP_RX_FIFO_AVAIL;
 641
 642         cmd_base = CDNS_MCP_CMD_BASE;
 643
 644         for (i = 0; i < num_resp; i++) {
 645                 cdns->response_buf[i] = cdns_readl(cdns, cmd_base);
 646                 cmd_base += CDNS_MCP_CMD_WORD_LEN;
 647         }
 648 }
 649
 650 static int cdns_update_slave_status(struct sdw_cdns *cdns,
 651                                     u32 slave0, u32 slave1)
 652 {
 653         enum sdw_slave_status status[SDW_MAX_DEVICES + 1];
 654         bool is_slave = false;
 655         u64 slave;
 656         u32 mask;
 657         int i, set_status;
 658
 659         /* combine the two status */
 660         slave = ((u64)slave1 << 32) | slave0;
 661         memset(status, 0, sizeof(status));
 662
 663         for (i = 0; i <= SDW_MAX_DEVICES; i++) {
 664                 mask = (slave >> (i * CDNS_MCP_SLAVE_STATUS_NUM)) &
 665                                 CDNS_MCP_SLAVE_STATUS_BITS;
 666                 if (!mask)
 667                         continue;
 668
 669                 is_slave = true;
 670                 set_status = 0;
 671
 672                 if (mask & CDNS_MCP_SLAVE_INTSTAT_RESERVED) {
 673                         status[i] = SDW_SLAVE_RESERVED;
 674                         set_status++;
 675                 }
 676
 677                 if (mask & CDNS_MCP_SLAVE_INTSTAT_ATTACHED) {
 678                         status[i] = SDW_SLAVE_ATTACHED;
 679                         set_status++;
 680                 }
 681
 682                 if (mask & CDNS_MCP_SLAVE_INTSTAT_ALERT) {
 683                         status[i] = SDW_SLAVE_ALERT;
 684                         set_status++;
 685                 }
 686
 687                 if (mask & CDNS_MCP_SLAVE_INTSTAT_NPRESENT) {
 688                         status[i] = SDW_SLAVE_UNATTACHED;
 689                         set_status++;
 690                 }
 691
 692                 /* first check if Slave reported multiple status */
 693                 if (set_status > 1) {
 694                         u32 val;
 695
 696                         dev_warn_ratelimited(cdns->dev,
 697                                              "Slave %d reported multiple Status: %d\n",
 698                                              i, mask);
 699
 700                         /* check latest status extracted from PING commands */
 701                         val = cdns_readl(cdns, CDNS_MCP_SLAVE_STAT);
 702                         val >>= (i * 2);
 703
 704                         switch (val & 0x3) {
 705                         case 0:
 706                                 status[i] = SDW_SLAVE_UNATTACHED;
 707                                 break;
 708                         case 1:
 709                                 status[i] = SDW_SLAVE_ATTACHED;
 710                                 break;
 711                         case 2:
 712                                 status[i] = SDW_SLAVE_ALERT;
 713                                 break;
 714                         case 3:
 715                         default:
 716                                 status[i] = SDW_SLAVE_RESERVED;
 717                                 break;
 718                         }
 719
 720                         dev_warn_ratelimited(cdns->dev,
 721                                              "Slave %d status updated to %d\n",
 722                                              i, status[i]);
 723
 724                 }
 725         }
 726
 727         if (is_slave)
 728                 return sdw_handle_slave_status(&cdns->bus, status);
 729
 730         return 0;
 731 }
 732
 733 /**
 734  * sdw_cdns_irq() - Cadence interrupt handler
 735  * @irq: irq number
 736  * @dev_id: irq context
 737  */
 738 irqreturn_t sdw_cdns_irq(int irq, void *dev_id)
 739 {
 740         struct sdw_cdns *cdns = dev_id;
 741         u32 int_status;
 742         int ret = IRQ_HANDLED;
 743
 744         /* Check if the link is up */
 745         if (!cdns->link_up)
 746                 return IRQ_NONE;
 747
 748         int_status = cdns_readl(cdns, CDNS_MCP_INTSTAT);
 749
 750         /* check for reserved values read as zero */
 751         if (int_status & CDNS_MCP_INT_RESERVED)
 752                 return IRQ_NONE;
 753
 754         if (!(int_status & CDNS_MCP_INT_IRQ))
 755                 return IRQ_NONE;
 756
 757         if (int_status & CDNS_MCP_INT_RX_WL) {
 758                 cdns_read_response(cdns);
 759
 760                 if (cdns->defer) {
 761                         cdns_fill_msg_resp(cdns, cdns->defer->msg,
 762                                            cdns->defer->length, 0);
 763                         complete(&cdns->defer->complete);
 764                         cdns->defer = NULL;
 765                 } else {
 766                         complete(&cdns->tx_complete);
 767                 }
 768         }
 769
 770         if (int_status & CDNS_MCP_INT_PARITY) {
 771                 /* Parity error detected by Master */
 772                 dev_err_ratelimited(cdns->dev, "Parity error\n");
 773         }
 774
 775         if (int_status & CDNS_MCP_INT_CTRL_CLASH) {
 776                 /* Slave is driving bit slot during control word */
 777                 dev_err_ratelimited(cdns->dev, "Bus clash for control word\n");
 778         }
 779
 780         if (int_status & CDNS_MCP_INT_DATA_CLASH) {
 781                 /*
 782                  * Multiple slaves trying to drive bit slot, or issue with
 783                  * ownership of data bits or Slave gone bonkers
 784                  */
 785                 dev_err_ratelimited(cdns->dev, "Bus clash for data word\n");
 786         }
 787
 788         if (int_status & CDNS_MCP_INT_SLAVE_MASK) {
 789                 /* Mask the Slave interrupt and wake thread */
 790                 cdns_updatel(cdns, CDNS_MCP_INTMASK,
 791                              CDNS_MCP_INT_SLAVE_MASK, 0);
 792
 793                 int_status &= ~CDNS_MCP_INT_SLAVE_MASK;
 794                 schedule_work(&cdns->work);
 795         }
 796
 797         cdns_writel(cdns, CDNS_MCP_INTSTAT, int_status);
 798         return ret;
 799 }
 800 EXPORT_SYMBOL(sdw_cdns_irq);
 801
 802 /**
 803  * To update slave status in a work since we will need to handle
 804  * other interrupts eg. CDNS_MCP_INT_RX_WL during the update slave
 805  * process.
 806  * @work: cdns worker thread
 807  */
 808 static void cdns_update_slave_status_work(struct work_struct *work)
 809 {
 810         struct sdw_cdns *cdns =
 811                 container_of(work, struct sdw_cdns, work);
 812         u32 slave0, slave1;
 813
 814         dev_dbg_ratelimited(cdns->dev, "Slave status change\n");
 815
 816         slave0 = cdns_readl(cdns, CDNS_MCP_SLAVE_INTSTAT0);
 817         slave1 = cdns_readl(cdns, CDNS_MCP_SLAVE_INTSTAT1);
 818
 819         cdns_update_slave_status(cdns, slave0, slave1);
 820         cdns_writel(cdns, CDNS_MCP_SLAVE_INTSTAT0, slave0);
 821         cdns_writel(cdns, CDNS_MCP_SLAVE_INTSTAT1, slave1);
 822
 823         /* clear and unmask Slave interrupt now */
 824         cdns_writel(cdns, CDNS_MCP_INTSTAT, CDNS_MCP_INT_SLAVE_MASK);
 825         cdns_updatel(cdns, CDNS_MCP_INTMASK,
 826                      CDNS_MCP_INT_SLAVE_MASK, CDNS_MCP_INT_SLAVE_MASK);
 827
 828 }
 829
 830 /*
 831  * init routines
 832  */
 833
 834 /**
 835  * sdw_cdns_exit_reset() - Program reset parameters and start bus operations
 836  * @cdns: Cadence instance
 837  */
 838 int sdw_cdns_exit_reset(struct sdw_cdns *cdns)
 839 {
 840         /* program maximum length reset to be safe */
 841         cdns_updatel(cdns, CDNS_MCP_CONTROL,
 842                      CDNS_MCP_CONTROL_RST_DELAY,
 843                      CDNS_MCP_CONTROL_RST_DELAY);
 844
 845         /* use hardware generated reset */
 846         cdns_updatel(cdns, CDNS_MCP_CONTROL,
 847                      CDNS_MCP_CONTROL_HW_RST,
 848                      CDNS_MCP_CONTROL_HW_RST);
 849
 850         /* commit changes */
 851         cdns_updatel(cdns, CDNS_MCP_CONFIG_UPDATE,
 852                      CDNS_MCP_CONFIG_UPDATE_BIT,
 853                      CDNS_MCP_CONFIG_UPDATE_BIT);
 854
 855         /* don't wait here */
 856         return 0;
 857
 858 }
 859 EXPORT_SYMBOL(sdw_cdns_exit_reset);
 860
 861 /**
 862  * sdw_cdns_enable_slave_interrupt() - Enable SDW slave interrupts
 863  * @cdns: Cadence instance
 864  * @state: boolean for true/false
 865  */
 866 static void cdns_enable_slave_interrupts(struct sdw_cdns *cdns, bool state)
 867 {
 868         u32 mask;
 869
 870         mask = cdns_readl(cdns, CDNS_MCP_INTMASK);
 871         if (state)
 872                 mask |= CDNS_MCP_INT_SLAVE_MASK;
 873         else
 874                 mask &= ~CDNS_MCP_INT_SLAVE_MASK;
 875
 876         cdns_writel(cdns, CDNS_MCP_INTMASK, mask);
 877 }
 878
 879 /**
 880  * sdw_cdns_enable_interrupt() - Enable SDW interrupts
 881  * @cdns: Cadence instance
 882  * @state: True if we are trying to enable interrupt.
 883  */
 884 int sdw_cdns_enable_interrupt(struct sdw_cdns *cdns, bool state)
 885 {
 886         u32 slave_intmask0 = 0;
 887         u32 slave_intmask1 = 0;
 888         u32 mask = 0;
 889
 890         if (!state)
 891                 goto update_masks;
 892
 893         slave_intmask0 = CDNS_MCP_SLAVE_INTMASK0_MASK;
 894         slave_intmask1 = CDNS_MCP_SLAVE_INTMASK1_MASK;
 895
 896         /* enable detection of all slave state changes */
 897         mask = CDNS_MCP_INT_SLAVE_MASK;
 898
 899         /* enable detection of bus issues */
 900         mask |= CDNS_MCP_INT_CTRL_CLASH | CDNS_MCP_INT_DATA_CLASH |
 901                 CDNS_MCP_INT_PARITY;
 902
 903         /* no detection of port interrupts for now */
 904
 905         /* enable detection of RX fifo level */
 906         mask |= CDNS_MCP_INT_RX_WL;
 907
 908         /*
 909          * CDNS_MCP_INT_IRQ needs to be set otherwise all previous
 910          * settings are irrelevant
 911          */
 912         mask |= CDNS_MCP_INT_IRQ;
 913
 914         if (interrupt_mask) /* parameter override */
 915                 mask = interrupt_mask;
 916
 917 update_masks:
 918         /* clear slave interrupt status before enabling interrupt */
 919         if (state) {
 920                 u32 slave_state;
 921
 922                 slave_state = cdns_readl(cdns, CDNS_MCP_SLAVE_INTSTAT0);
 923                 cdns_writel(cdns, CDNS_MCP_SLAVE_INTSTAT0, slave_state);
 924                 slave_state = cdns_readl(cdns, CDNS_MCP_SLAVE_INTSTAT1);
 925                 cdns_writel(cdns, CDNS_MCP_SLAVE_INTSTAT1, slave_state);
 926         }
 927
 928         cdns_writel(cdns, CDNS_MCP_SLAVE_INTMASK0, slave_intmask0);
 929         cdns_writel(cdns, CDNS_MCP_SLAVE_INTMASK1, slave_intmask1);
 930         cdns_writel(cdns, CDNS_MCP_INTMASK, mask);
 931
 932         return 0;
 933 }
 934 EXPORT_SYMBOL(sdw_cdns_enable_interrupt);
 935
 936 static int cdns_allocate_pdi(struct sdw_cdns *cdns,
 937                              struct sdw_cdns_pdi **stream,
 938                              u32 num, u32 pdi_offset)
 939 {
 940         struct sdw_cdns_pdi *pdi;
 941         int i;
 942
 943         if (!num)
 944                 return 0;
 945
 946         pdi = devm_kcalloc(cdns->dev, num, sizeof(*pdi), GFP_KERNEL);
 947         if (!pdi)
 948                 return -ENOMEM;
 949
 950         for (i = 0; i < num; i++) {
 951                 pdi[i].num = i + pdi_offset;
 952         }
 953
 954         *stream = pdi;
 955         return 0;
 956 }
 957
 958 /**
 959  * sdw_cdns_pdi_init() - PDI initialization routine
 960  *
 961  * @cdns: Cadence instance
 962  * @config: Stream configurations
 963  */
 964 int sdw_cdns_pdi_init(struct sdw_cdns *cdns,
 965                       struct sdw_cdns_stream_config config)
 966 {
 967         struct sdw_cdns_streams *stream;
 968         int offset;
 969         int ret;
 970
 971         cdns->pcm.num_bd = config.pcm_bd;
 972         cdns->pcm.num_in = config.pcm_in;
 973         cdns->pcm.num_out = config.pcm_out;
 974         cdns->pdm.num_bd = config.pdm_bd;
 975         cdns->pdm.num_in = config.pdm_in;
 976         cdns->pdm.num_out = config.pdm_out;
 977
 978         /* Allocate PDIs for PCMs */
 979         stream = &cdns->pcm;
 980
 981         /* we allocate PDI0 and PDI1 which are used for Bulk */
 982         offset = 0;
 983
 984         ret = cdns_allocate_pdi(cdns, &stream->bd,
 985                                 stream->num_bd, offset);
 986         if (ret)
 987                 return ret;
 988
 989         offset += stream->num_bd;
 990
 991         ret = cdns_allocate_pdi(cdns, &stream->in,
 992                                 stream->num_in, offset);
 993         if (ret)
 994                 return ret;
 995
 996         offset += stream->num_in;
 997
 998         ret = cdns_allocate_pdi(cdns, &stream->out,
 999                                 stream->num_out, offset);
1000         if (ret)
1001                 return ret;
1002
1003         /* Update total number of PCM PDIs */
1004         stream->num_pdi = stream->num_bd + stream->num_in + stream->num_out;
1005         cdns->num_ports = stream->num_pdi;
1006
1007         /* Allocate PDIs for PDMs */
1008         stream = &cdns->pdm;
1009         ret = cdns_allocate_pdi(cdns, &stream->bd,
1010                                 stream->num_bd, offset);
1011         if (ret)
1012                 return ret;
1013
1014         offset += stream->num_bd;
1015
1016         ret = cdns_allocate_pdi(cdns, &stream->in,
1017                                 stream->num_in, offset);
1018         if (ret)
1019                 return ret;
1020
1021         offset += stream->num_in;
1022
1023         ret = cdns_allocate_pdi(cdns, &stream->out,
1024                                 stream->num_out, offset);
1025
1026         if (ret)
1027                 return ret;
1028
1029         /* Update total number of PDM PDIs */
1030         stream->num_pdi = stream->num_bd + stream->num_in + stream->num_out;
1031         cdns->num_ports += stream->num_pdi;
1032
1033         return 0;
1034 }
1035 EXPORT_SYMBOL(sdw_cdns_pdi_init);
1036
1037 static u32 cdns_set_initial_frame_shape(int n_rows, int n_cols)
1038 {
1039         u32 val;
1040         int c;
1041         int r;
1042
1043         r = sdw_find_row_index(n_rows);
1044         c = sdw_find_col_index(n_cols) & CDNS_MCP_FRAME_SHAPE_COL_MASK;
1045
1046         val = (r << CDNS_MCP_FRAME_SHAPE_ROW_OFFSET) | c;
1047
1048         return val;
1049 }
1050
1051 static void cdns_init_clock_ctrl(struct sdw_cdns *cdns)
1052 {
1053         struct sdw_bus *bus = &cdns->bus;
1054         struct sdw_master_prop *prop = &bus->prop;
1055         u32 val;
1056         u32 ssp_interval;
1057         int divider;
1058
1059         /* Set clock divider */
1060         divider = (prop->mclk_freq / prop->max_clk_freq) - 1;
1061
1062         cdns_updatel(cdns, CDNS_MCP_CLK_CTRL0,
1063                      CDNS_MCP_CLK_MCLKD_MASK, divider);
1064         cdns_updatel(cdns, CDNS_MCP_CLK_CTRL1,
1065                      CDNS_MCP_CLK_MCLKD_MASK, divider);
1066
1067         /*
1068          * Frame shape changes after initialization have to be done
1069          * with the bank switch mechanism
1070          */
1071         val = cdns_set_initial_frame_shape(prop->default_row,
1072                                            prop->default_col);
1073         cdns_writel(cdns, CDNS_MCP_FRAME_SHAPE_INIT, val);
1074
1075         /* Set SSP interval to default value */
1076         ssp_interval = prop->default_frame_rate / SDW_CADENCE_GSYNC_HZ;
1077         cdns_writel(cdns, CDNS_MCP_SSP_CTRL0, ssp_interval);
1078         cdns_writel(cdns, CDNS_MCP_SSP_CTRL1, ssp_interval);
1079 }
1080
1081 /**
1082  * sdw_cdns_init() - Cadence initialization
1083  * @cdns: Cadence instance
1084  */
1085 int sdw_cdns_init(struct sdw_cdns *cdns)
1086 {
1087         u32 val;
1088
1089         cdns_init_clock_ctrl(cdns);
1090
1091         /* reset msg_count to default value of FIFOLEVEL */
1092         cdns->msg_count = cdns_readl(cdns, CDNS_MCP_FIFOLEVEL);
1093
1094         /* flush command FIFOs */
1095         cdns_updatel(cdns, CDNS_MCP_CONTROL, CDNS_MCP_CONTROL_CMD_RST,
1096                      CDNS_MCP_CONTROL_CMD_RST);
1097
1098         /* Set cmd accept mode */
1099         cdns_updatel(cdns, CDNS_MCP_CONTROL, CDNS_MCP_CONTROL_CMD_ACCEPT,
1100                      CDNS_MCP_CONTROL_CMD_ACCEPT);
1101
1102         /* Configure mcp config */
1103         val = cdns_readl(cdns, CDNS_MCP_CONFIG);
1104
1105         /* enable bus operations with clock and data */
1106         val &= ~CDNS_MCP_CONFIG_OP;
1107         val |= CDNS_MCP_CONFIG_OP_NORMAL;
1108
1109         /* Set cmd mode for Tx and Rx cmds */
1110         val &= ~CDNS_MCP_CONFIG_CMD;
1111
1112         /* Disable sniffer mode */
1113         val &= ~CDNS_MCP_CONFIG_SNIFFER;
1114
1115         /* Disable auto bus release */
1116         val &= ~CDNS_MCP_CONFIG_BUS_REL;
1117
1118         if (cdns->bus.multi_link)
1119                 /* Set Multi-master mode to take gsync into account */
1120                 val |= CDNS_MCP_CONFIG_MMASTER;
1121
1122         /* leave frame delay to hardware default of 0x1F */
1123
1124         /* leave command retry to hardware default of 0 */
1125
1126         cdns_writel(cdns, CDNS_MCP_CONFIG, val);
1127
1128         /* changes will be committed later */
1129         return 0;
1130 }
1131 EXPORT_SYMBOL(sdw_cdns_init);
1132
1133 int cdns_bus_conf(struct sdw_bus *bus, struct sdw_bus_params *params)
1134 {
1135         struct sdw_master_prop *prop = &bus->prop;
1136         struct sdw_cdns *cdns = bus_to_cdns(bus);
1137         int mcp_clkctrl_off;
1138         int divider;
1139
1140         if (!params->curr_dr_freq) {
1141                 dev_err(cdns->dev, "NULL curr_dr_freq\n");
1142                 return -EINVAL;
1143         }
1144
1145         divider = prop->mclk_freq * SDW_DOUBLE_RATE_FACTOR /
1146                 params->curr_dr_freq;
1147         divider--; /* divider is 1/(N+1) */
1148
1149         if (params->next_bank)
1150                 mcp_clkctrl_off = CDNS_MCP_CLK_CTRL1;
1151         else
1152                 mcp_clkctrl_off = CDNS_MCP_CLK_CTRL0;
1153
1154         cdns_updatel(cdns, mcp_clkctrl_off, CDNS_MCP_CLK_MCLKD_MASK, divider);
1155
1156         return 0;
1157 }
1158 EXPORT_SYMBOL(cdns_bus_conf);
1159
1160 static int cdns_port_params(struct sdw_bus *bus,
1161                             struct sdw_port_params *p_params, unsigned int bank)
1162 {
1163         struct sdw_cdns *cdns = bus_to_cdns(bus);
1164         int dpn_config = 0, dpn_config_off;
1165
1166         if (bank)
1167                 dpn_config_off = CDNS_DPN_B1_CONFIG(p_params->num);
1168         else
1169                 dpn_config_off = CDNS_DPN_B0_CONFIG(p_params->num);
1170
1171         dpn_config = cdns_readl(cdns, dpn_config_off);
1172
1173         dpn_config |= ((p_params->bps - 1) <<
1174                                 SDW_REG_SHIFT(CDNS_DPN_CONFIG_WL));
1175         dpn_config |= (p_params->flow_mode <<
1176                                 SDW_REG_SHIFT(CDNS_DPN_CONFIG_PORT_FLOW));
1177         dpn_config |= (p_params->data_mode <<
1178                                 SDW_REG_SHIFT(CDNS_DPN_CONFIG_PORT_DAT));
1179
1180         cdns_writel(cdns, dpn_config_off, dpn_config);
1181
1182         return 0;
1183 }
1184
1185 static int cdns_transport_params(struct sdw_bus *bus,
1186                                  struct sdw_transport_params *t_params,
1187                                  enum sdw_reg_bank bank)
1188 {
1189         struct sdw_cdns *cdns = bus_to_cdns(bus);
1190         int dpn_offsetctrl = 0, dpn_offsetctrl_off;
1191         int dpn_config = 0, dpn_config_off;
1192         int dpn_hctrl = 0, dpn_hctrl_off;
1193         int num = t_params->port_num;
1194         int dpn_samplectrl_off;
1195
1196         /*
1197          * Note: Only full data port is supported on the Master side for
1198          * both PCM and PDM ports.
1199          */
1200
1201         if (bank) {
1202                 dpn_config_off = CDNS_DPN_B1_CONFIG(num);
1203                 dpn_samplectrl_off = CDNS_DPN_B1_SAMPLE_CTRL(num);
1204                 dpn_hctrl_off = CDNS_DPN_B1_HCTRL(num);
1205                 dpn_offsetctrl_off = CDNS_DPN_B1_OFFSET_CTRL(num);
1206         } else {
1207                 dpn_config_off = CDNS_DPN_B0_CONFIG(num);
1208                 dpn_samplectrl_off = CDNS_DPN_B0_SAMPLE_CTRL(num);
1209                 dpn_hctrl_off = CDNS_DPN_B0_HCTRL(num);
1210                 dpn_offsetctrl_off = CDNS_DPN_B0_OFFSET_CTRL(num);
1211         }
1212
1213         dpn_config = cdns_readl(cdns, dpn_config_off);
1214
1215         dpn_config |= (t_params->blk_grp_ctrl <<
1216                                 SDW_REG_SHIFT(CDNS_DPN_CONFIG_BGC));
1217         dpn_config |= (t_params->blk_pkg_mode <<
1218                                 SDW_REG_SHIFT(CDNS_DPN_CONFIG_BPM));
1219         cdns_writel(cdns, dpn_config_off, dpn_config);
1220
1221         dpn_offsetctrl |= (t_params->offset1 <<
1222                                 SDW_REG_SHIFT(CDNS_DPN_OFFSET_CTRL_1));
1223         dpn_offsetctrl |= (t_params->offset2 <<
1224                                 SDW_REG_SHIFT(CDNS_DPN_OFFSET_CTRL_2));
1225         cdns_writel(cdns, dpn_offsetctrl_off,  dpn_offsetctrl);
1226
1227         dpn_hctrl |= (t_params->hstart <<
1228                                 SDW_REG_SHIFT(CDNS_DPN_HCTRL_HSTART));
1229         dpn_hctrl |= (t_params->hstop << SDW_REG_SHIFT(CDNS_DPN_HCTRL_HSTOP));
1230         dpn_hctrl |= (t_params->lane_ctrl <<
1231                                 SDW_REG_SHIFT(CDNS_DPN_HCTRL_LCTRL));
1232
1233         cdns_writel(cdns, dpn_hctrl_off, dpn_hctrl);
1234         cdns_writel(cdns, dpn_samplectrl_off, (t_params->sample_interval - 1));
1235
1236         return 0;
1237 }
1238
1239 static int cdns_port_enable(struct sdw_bus *bus,
1240                             struct sdw_enable_ch *enable_ch, unsigned int bank)
1241 {
1242         struct sdw_cdns *cdns = bus_to_cdns(bus);
1243         int dpn_chnen_off, ch_mask;
1244
1245         if (bank)
1246                 dpn_chnen_off = CDNS_DPN_B1_CH_EN(enable_ch->port_num);
1247         else
1248                 dpn_chnen_off = CDNS_DPN_B0_CH_EN(enable_ch->port_num);
1249
1250         ch_mask = enable_ch->ch_mask * enable_ch->enable;
1251         cdns_writel(cdns, dpn_chnen_off, ch_mask);
1252
1253         return 0;
1254 }
1255
1256 static const struct sdw_master_port_ops cdns_port_ops = {
1257         .dpn_set_port_params = cdns_port_params,
1258         .dpn_set_port_transport_params = cdns_transport_params,
1259         .dpn_port_enable_ch = cdns_port_enable,
1260 };
1261
1262 /**
1263  * sdw_cdns_is_clock_stop: Check clock status
1264  *
1265  * @cdns: Cadence instance
1266  */
1267 bool sdw_cdns_is_clock_stop(struct sdw_cdns *cdns)
1268 {
1269         return !!(cdns_readl(cdns, CDNS_MCP_STAT) & CDNS_MCP_STAT_CLK_STOP);
1270 }
1271 EXPORT_SYMBOL(sdw_cdns_is_clock_stop);
1272
1273 /**
1274  * sdw_cdns_clock_stop: Cadence clock stop configuration routine
1275  *
1276  * @cdns: Cadence instance
1277  * @block_wake: prevent wakes if required by the platform
1278  */
1279 int sdw_cdns_clock_stop(struct sdw_cdns *cdns, bool block_wake)
1280 {
1281         bool slave_present = false;
1282         struct sdw_slave *slave;
1283         int ret;
1284
1285         /* Check suspend status */
1286         if (sdw_cdns_is_clock_stop(cdns)) {
1287                 dev_dbg(cdns->dev, "Clock is already stopped\n");
1288                 return 0;
1289         }
1290
1291         /*
1292          * Before entering clock stop we mask the Slave
1293          * interrupts. This helps avoid having to deal with e.g. a
1294          * Slave becoming UNATTACHED while the clock is being stopped
1295          */
1296         cdns_enable_slave_interrupts(cdns, false);
1297
1298         /*
1299          * For specific platforms, it is required to be able to put
1300          * master into a state in which it ignores wake-up trials
1301          * in clock stop state
1302          */
1303         if (block_wake)
1304                 cdns_updatel(cdns, CDNS_MCP_CONTROL,
1305                              CDNS_MCP_CONTROL_BLOCK_WAKEUP,
1306                              CDNS_MCP_CONTROL_BLOCK_WAKEUP);
1307
1308         list_for_each_entry(slave, &cdns->bus.slaves, node) {
1309                 if (slave->status == SDW_SLAVE_ATTACHED ||
1310                     slave->status == SDW_SLAVE_ALERT) {
1311                         slave_present = true;
1312                         break;
1313                 }
1314         }
1315
1316         /*
1317          * This CMD_ACCEPT should be used when there are no devices
1318          * attached on the link when entering clock stop mode. If this is
1319          * not set and there is a broadcast write then the command ignored
1320          * will be treated as a failure
1321          */
1322         if (!slave_present)
1323                 cdns_updatel(cdns, CDNS_MCP_CONTROL,
1324                              CDNS_MCP_CONTROL_CMD_ACCEPT,
1325                              CDNS_MCP_CONTROL_CMD_ACCEPT);
1326         else
1327                 cdns_updatel(cdns, CDNS_MCP_CONTROL,
1328                              CDNS_MCP_CONTROL_CMD_ACCEPT, 0);
1329
1330         /* commit changes */
1331         ret = cdns_config_update(cdns);
1332         if (ret < 0) {
1333                 dev_err(cdns->dev, "%s: config_update failed\n", __func__);
1334                 return ret;
1335         }
1336
1337         /* Prepare slaves for clock stop */
1338         ret = sdw_bus_prep_clk_stop(&cdns->bus);
1339         if (ret < 0) {
1340                 dev_err(cdns->dev, "prepare clock stop failed %d", ret);
1341                 return ret;
1342         }
1343
1344         /*
1345          * Enter clock stop mode and only report errors if there are
1346          * Slave devices present (ALERT or ATTACHED)
1347          */
1348         ret = sdw_bus_clk_stop(&cdns->bus);
1349         if (ret < 0 && slave_present && ret != -ENODATA) {
1350                 dev_err(cdns->dev, "bus clock stop failed %d", ret);
1351                 return ret;
1352         }
1353
1354         ret = cdns_set_wait(cdns, CDNS_MCP_STAT,
1355                             CDNS_MCP_STAT_CLK_STOP,
1356                             CDNS_MCP_STAT_CLK_STOP);
1357         if (ret < 0)
1358                 dev_err(cdns->dev, "Clock stop failed %d\n", ret);
1359
1360         return ret;
1361 }
1362 EXPORT_SYMBOL(sdw_cdns_clock_stop);
1363
1364 /**
1365  * sdw_cdns_clock_restart: Cadence PM clock restart configuration routine
1366  *
1367  * @cdns: Cadence instance
1368  * @bus_reset: context may be lost while in low power modes and the bus
1369  * may require a Severe Reset and re-enumeration after a wake.
1370  */
1371 int sdw_cdns_clock_restart(struct sdw_cdns *cdns, bool bus_reset)
1372 {
1373         int ret;
1374
1375         /* unmask Slave interrupts that were masked when stopping the clock */
1376         cdns_enable_slave_interrupts(cdns, true);
1377
1378         ret = cdns_clear_bit(cdns, CDNS_MCP_CONTROL,
1379                              CDNS_MCP_CONTROL_CLK_STOP_CLR);
1380         if (ret < 0) {
1381                 dev_err(cdns->dev, "Couldn't exit from clock stop\n");
1382                 return ret;
1383         }
1384
1385         ret = cdns_set_wait(cdns, CDNS_MCP_STAT, CDNS_MCP_STAT_CLK_STOP, 0);
1386         if (ret < 0) {
1387                 dev_err(cdns->dev, "clock stop exit failed %d\n", ret);
1388                 return ret;
1389         }
1390
1391         cdns_updatel(cdns, CDNS_MCP_CONTROL,
1392                      CDNS_MCP_CONTROL_BLOCK_WAKEUP, 0);
1393
1394         /*
1395          * clear CMD_ACCEPT so that the command ignored
1396          * will be treated as a failure during a broadcast write
1397          */
1398         cdns_updatel(cdns, CDNS_MCP_CONTROL, CDNS_MCP_CONTROL_CMD_ACCEPT, 0);
1399
1400         if (!bus_reset) {
1401
1402                 /* enable bus operations with clock and data */
1403                 cdns_updatel(cdns, CDNS_MCP_CONFIG,
1404                              CDNS_MCP_CONFIG_OP,
1405                              CDNS_MCP_CONFIG_OP_NORMAL);
1406
1407                 ret = cdns_config_update(cdns);
1408                 if (ret < 0) {
1409                         dev_err(cdns->dev, "%s: config_update failed\n", __func__);
1410                         return ret;
1411                 }
1412
1413                 ret = sdw_bus_exit_clk_stop(&cdns->bus);
1414                 if (ret < 0)
1415                         dev_err(cdns->dev, "bus failed to exit clock stop %d\n", ret);
1416         }
1417
1418         return ret;
1419 }
1420 EXPORT_SYMBOL(sdw_cdns_clock_restart);
1421
1422 /**
1423  * sdw_cdns_probe() - Cadence probe routine
1424  * @cdns: Cadence instance
1425  */
1426 int sdw_cdns_probe(struct sdw_cdns *cdns)
1427 {
1428         init_completion(&cdns->tx_complete);
1429         cdns->bus.port_ops = &cdns_port_ops;
1430
1431         INIT_WORK(&cdns->work, cdns_update_slave_status_work);
1432         return 0;
1433 }
1434 EXPORT_SYMBOL(sdw_cdns_probe);
1435
1436 int cdns_set_sdw_stream(struct snd_soc_dai *dai,
1437                         void *stream, bool pcm, int direction)
1438 {
1439         struct sdw_cdns *cdns = snd_soc_dai_get_drvdata(dai);
1440         struct sdw_cdns_dma_data *dma;
1441
1442         if (stream) {
1443                 /* first paranoia check */
1444                 if (direction == SNDRV_PCM_STREAM_PLAYBACK)
1445                         dma = dai->playback_dma_data;
1446                 else
1447                         dma = dai->capture_dma_data;
1448
1449                 if (dma) {
1450                         dev_err(dai->dev,
1451                                 "dma_data already allocated for dai %s\n",
1452                                 dai->name);
1453                         return -EINVAL;
1454                 }
1455
1456                 /* allocate and set dma info */
1457                 dma = kzalloc(sizeof(*dma), GFP_KERNEL);
1458                 if (!dma)
1459                         return -ENOMEM;
1460
1461                 if (pcm)
1462                         dma->stream_type = SDW_STREAM_PCM;
1463                 else
1464                         dma->stream_type = SDW_STREAM_PDM;
1465
1466                 dma->bus = &cdns->bus;
1467                 dma->link_id = cdns->instance;
1468
1469                 dma->stream = stream;
1470
1471                 if (direction == SNDRV_PCM_STREAM_PLAYBACK)
1472                         dai->playback_dma_data = dma;
1473                 else
1474                         dai->capture_dma_data = dma;
1475         } else {
1476                 /* for NULL stream we release allocated dma_data */
1477                 if (direction == SNDRV_PCM_STREAM_PLAYBACK) {
1478                         kfree(dai->playback_dma_data);
1479                         dai->playback_dma_data = NULL;
1480                 } else {
1481                         kfree(dai->capture_dma_data);
1482                         dai->capture_dma_data = NULL;
1483                 }
1484         }
1485         return 0;
1486 }
1487 EXPORT_SYMBOL(cdns_set_sdw_stream);
1488
1489 /**
1490  * cdns_find_pdi() - Find a free PDI
1491  *
1492  * @cdns: Cadence instance
1493  * @offset: Starting offset
1494  * @num: Number of PDIs
1495  * @pdi: PDI instances
1496  * @dai_id: DAI id
1497  *
1498  * Find a PDI for a given PDI array. The PDI num and dai_id are
1499  * expected to match, return NULL otherwise.
1500  */
1501 static struct sdw_cdns_pdi *cdns_find_pdi(struct sdw_cdns *cdns,
1502                                           unsigned int offset,
1503                                           unsigned int num,
1504                                           struct sdw_cdns_pdi *pdi,
1505                                           int dai_id)
1506 {
1507         int i;
1508
1509         for (i = offset; i < offset + num; i++)
1510                 if (pdi[i].num == dai_id)
1511                         return &pdi[i];
1512
1513         return NULL;
1514 }
1515
1516 /**
1517  * sdw_cdns_config_stream: Configure a stream
1518  *
1519  * @cdns: Cadence instance
1520  * @ch: Channel count
1521  * @dir: Data direction
1522  * @pdi: PDI to be used
1523  */
1524 void sdw_cdns_config_stream(struct sdw_cdns *cdns,
1525                             u32 ch, u32 dir, struct sdw_cdns_pdi *pdi)
1526 {
1527         u32 offset, val = 0;
1528
1529         if (dir == SDW_DATA_DIR_RX)
1530                 val = CDNS_PORTCTRL_DIRN;
1531
1532         offset = CDNS_PORTCTRL + pdi->num * CDNS_PORT_OFFSET;
1533         cdns_updatel(cdns, offset, CDNS_PORTCTRL_DIRN, val);
1534
1535         val = pdi->num;
1536         val |= CDNS_PDI_CONFIG_SOFT_RESET;
1537         val |= ((1 << ch) - 1) << SDW_REG_SHIFT(CDNS_PDI_CONFIG_CHANNEL);
1538         cdns_writel(cdns, CDNS_PDI_CONFIG(pdi->num), val);
1539 }
1540 EXPORT_SYMBOL(sdw_cdns_config_stream);
1541
1542 /**
1543  * sdw_cdns_alloc_pdi() - Allocate a PDI
1544  *
1545  * @cdns: Cadence instance
1546  * @stream: Stream to be allocated
1547  * @ch: Channel count
1548  * @dir: Data direction
1549  * @dai_id: DAI id
1550  */
1551 struct sdw_cdns_pdi *sdw_cdns_alloc_pdi(struct sdw_cdns *cdns,
1552                                         struct sdw_cdns_streams *stream,
1553                                         u32 ch, u32 dir, int dai_id)
1554 {
1555         struct sdw_cdns_pdi *pdi = NULL;
1556
1557         if (dir == SDW_DATA_DIR_RX)
1558                 pdi = cdns_find_pdi(cdns, 0, stream->num_in, stream->in,
1559                                     dai_id);
1560         else
1561                 pdi = cdns_find_pdi(cdns, 0, stream->num_out, stream->out,
1562                                     dai_id);
1563
1564         /* check if we found a PDI, else find in bi-directional */
1565         if (!pdi)
1566                 pdi = cdns_find_pdi(cdns, 2, stream->num_bd, stream->bd,
1567                                     dai_id);
1568
1569         if (pdi) {
1570                 pdi->l_ch_num = 0;
1571                 pdi->h_ch_num = ch - 1;
1572                 pdi->dir = dir;
1573                 pdi->ch_count = ch;
1574         }
1575
1576         return pdi;
1577 }
1578 EXPORT_SYMBOL(sdw_cdns_alloc_pdi);
1579
1580 MODULE_LICENSE("Dual BSD/GPL");
1581 MODULE_DESCRIPTION("Cadence Soundwire Library");