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_DEFAULT_SSP_INTERVAL               0x18
 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_clear_bit(struct sdw_cdns *cdns, int offset, u32 value)
 215 {
 216         int timeout = 10;
 217         u32 reg_read;
 218
 219         writel(value, cdns->registers + offset);
 220
 221         /* Wait for bit to be self cleared */
 222         do {
 223                 reg_read = readl(cdns->registers + offset);
 224                 if ((reg_read & value) == 0)
 225                         return 0;
 226
 227                 timeout--;
 228                 udelay(50);
 229         } while (timeout != 0);
 230
 231         return -EAGAIN;
 232 }
 233
 234 /*
 235  * all changes to the MCP_CONFIG, MCP_CONTROL, MCP_CMDCTRL and MCP_PHYCTRL
 236  * need to be confirmed with a write to MCP_CONFIG_UPDATE
 237  */
 238 static int cdns_update_config(struct sdw_cdns *cdns)
 239 {
 240         int ret;
 241
 242         ret = cdns_clear_bit(cdns, CDNS_MCP_CONFIG_UPDATE,
 243                              CDNS_MCP_CONFIG_UPDATE_BIT);
 244         if (ret < 0)
 245                 dev_err(cdns->dev, "Config update timedout\n");
 246
 247         return ret;
 248 }
 249
 250 /*
 251  * debugfs
 252  */
 253 #ifdef CONFIG_DEBUG_FS
 254
 255 #define RD_BUF (2 * PAGE_SIZE)
 256
 257 static ssize_t cdns_sprintf(struct sdw_cdns *cdns,
 258                             char *buf, size_t pos, unsigned int reg)
 259 {
 260         return scnprintf(buf + pos, RD_BUF - pos,
 261                          "%4x\t%8x\n", reg, cdns_readl(cdns, reg));
 262 }
 263
 264 static int cdns_reg_show(struct seq_file *s, void *data)
 265 {
 266         struct sdw_cdns *cdns = s->private;
 267         char *buf;
 268         ssize_t ret;
 269         int num_ports;
 270         int i, j;
 271
 272         buf = kzalloc(RD_BUF, GFP_KERNEL);
 273         if (!buf)
 274                 return -ENOMEM;
 275
 276         ret = scnprintf(buf, RD_BUF, "Register  Value\n");
 277         ret += scnprintf(buf + ret, RD_BUF - ret, "\nMCP Registers\n");
 278         /* 8 MCP registers */
 279         for (i = CDNS_MCP_CONFIG; i <= CDNS_MCP_PHYCTRL; i += sizeof(u32))
 280                 ret += cdns_sprintf(cdns, buf, ret, i);
 281
 282         ret += scnprintf(buf + ret, RD_BUF - ret,
 283                          "\nStatus & Intr Registers\n");
 284         /* 13 Status & Intr registers (offsets 0x70 and 0x74 not defined) */
 285         for (i = CDNS_MCP_STAT; i <=  CDNS_MCP_FIFOSTAT; i += sizeof(u32))
 286                 ret += cdns_sprintf(cdns, buf, ret, i);
 287
 288         ret += scnprintf(buf + ret, RD_BUF - ret,
 289                          "\nSSP & Clk ctrl Registers\n");
 290         ret += cdns_sprintf(cdns, buf, ret, CDNS_MCP_SSP_CTRL0);
 291         ret += cdns_sprintf(cdns, buf, ret, CDNS_MCP_SSP_CTRL1);
 292         ret += cdns_sprintf(cdns, buf, ret, CDNS_MCP_CLK_CTRL0);
 293         ret += cdns_sprintf(cdns, buf, ret, CDNS_MCP_CLK_CTRL1);
 294
 295         ret += scnprintf(buf + ret, RD_BUF - ret,
 296                          "\nDPn B0 Registers\n");
 297
 298         num_ports = cdns->num_ports;
 299
 300         for (i = 0; i < num_ports; i++) {
 301                 ret += scnprintf(buf + ret, RD_BUF - ret,
 302                                  "\nDP-%d\n", i);
 303                 for (j = CDNS_DPN_B0_CONFIG(i);
 304                      j < CDNS_DPN_B0_ASYNC_CTRL(i); j += sizeof(u32))
 305                         ret += cdns_sprintf(cdns, buf, ret, j);
 306         }
 307
 308         ret += scnprintf(buf + ret, RD_BUF - ret,
 309                          "\nDPn B1 Registers\n");
 310         for (i = 0; i < num_ports; i++) {
 311                 ret += scnprintf(buf + ret, RD_BUF - ret,
 312                                  "\nDP-%d\n", i);
 313
 314                 for (j = CDNS_DPN_B1_CONFIG(i);
 315                      j < CDNS_DPN_B1_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 Control Registers\n");
 321         for (i = 0; i < num_ports; i++)
 322                 ret += cdns_sprintf(cdns, buf, ret,
 323                                 CDNS_PORTCTRL + i * CDNS_PORT_OFFSET);
 324
 325         ret += scnprintf(buf + ret, RD_BUF - ret,
 326                          "\nPDIn Config Registers\n");
 327
 328         /* number of PDI and ports is interchangeable */
 329         for (i = 0; i < num_ports; i++)
 330                 ret += cdns_sprintf(cdns, buf, ret, CDNS_PDI_CONFIG(i));
 331
 332         seq_printf(s, "%s", buf);
 333         kfree(buf);
 334
 335         return 0;
 336 }
 337 DEFINE_SHOW_ATTRIBUTE(cdns_reg);
 338
 339 static int cdns_hw_reset(void *data, u64 value)
 340 {
 341         struct sdw_cdns *cdns = data;
 342         int ret;
 343
 344         if (value != 1)
 345                 return -EINVAL;
 346
 347         /* Userspace changed the hardware state behind the kernel's back */
 348         add_taint(TAINT_USER, LOCKDEP_STILL_OK);
 349
 350         ret = sdw_cdns_exit_reset(cdns);
 351
 352         dev_dbg(cdns->dev, "link hw_reset done: %d\n", ret);
 353
 354         return ret;
 355 }
 356
 357 DEFINE_DEBUGFS_ATTRIBUTE(cdns_hw_reset_fops, NULL, cdns_hw_reset, "%llu\n");
 358
 359 /**
 360  * sdw_cdns_debugfs_init() - Cadence debugfs init
 361  * @cdns: Cadence instance
 362  * @root: debugfs root
 363  */
 364 void sdw_cdns_debugfs_init(struct sdw_cdns *cdns, struct dentry *root)
 365 {
 366         debugfs_create_file("cdns-registers", 0400, root, cdns, &cdns_reg_fops);
 367
 368         debugfs_create_file("cdns-hw-reset", 0200, root, cdns,
 369                             &cdns_hw_reset_fops);
 370 }
 371 EXPORT_SYMBOL_GPL(sdw_cdns_debugfs_init);
 372
 373 #endif /* CONFIG_DEBUG_FS */
 374
 375 /*
 376  * IO Calls
 377  */
 378 static enum sdw_command_response
 379 cdns_fill_msg_resp(struct sdw_cdns *cdns,
 380                    struct sdw_msg *msg, int count, int offset)
 381 {
 382         int nack = 0, no_ack = 0;
 383         int i;
 384
 385         /* check message response */
 386         for (i = 0; i < count; i++) {
 387                 if (!(cdns->response_buf[i] & CDNS_MCP_RESP_ACK)) {
 388                         no_ack = 1;
 389                         dev_dbg_ratelimited(cdns->dev, "Msg Ack not received\n");
 390                         if (cdns->response_buf[i] & CDNS_MCP_RESP_NACK) {
 391                                 nack = 1;
 392                                 dev_err_ratelimited(cdns->dev, "Msg NACK received\n");
 393                         }
 394                 }
 395         }
 396
 397         if (nack) {
 398                 dev_err_ratelimited(cdns->dev, "Msg NACKed for Slave %d\n", msg->dev_num);
 399                 return SDW_CMD_FAIL;
 400         } else if (no_ack) {
 401                 dev_dbg_ratelimited(cdns->dev, "Msg ignored for Slave %d\n", msg->dev_num);
 402                 return SDW_CMD_IGNORED;
 403         }
 404
 405         /* fill response */
 406         for (i = 0; i < count; i++)
 407                 msg->buf[i + offset] = cdns->response_buf[i] >>
 408                                 SDW_REG_SHIFT(CDNS_MCP_RESP_RDATA);
 409
 410         return SDW_CMD_OK;
 411 }
 412
 413 static enum sdw_command_response
 414 _cdns_xfer_msg(struct sdw_cdns *cdns, struct sdw_msg *msg, int cmd,
 415                int offset, int count, bool defer)
 416 {
 417         unsigned long time;
 418         u32 base, i, data;
 419         u16 addr;
 420
 421         /* Program the watermark level for RX FIFO */
 422         if (cdns->msg_count != count) {
 423                 cdns_writel(cdns, CDNS_MCP_FIFOLEVEL, count);
 424                 cdns->msg_count = count;
 425         }
 426
 427         base = CDNS_MCP_CMD_BASE;
 428         addr = msg->addr;
 429
 430         for (i = 0; i < count; i++) {
 431                 data = msg->dev_num << SDW_REG_SHIFT(CDNS_MCP_CMD_DEV_ADDR);
 432                 data |= cmd << SDW_REG_SHIFT(CDNS_MCP_CMD_COMMAND);
 433                 data |= addr++  << SDW_REG_SHIFT(CDNS_MCP_CMD_REG_ADDR_L);
 434
 435                 if (msg->flags == SDW_MSG_FLAG_WRITE)
 436                         data |= msg->buf[i + offset];
 437
 438                 data |= msg->ssp_sync << SDW_REG_SHIFT(CDNS_MCP_CMD_SSP_TAG);
 439                 cdns_writel(cdns, base, data);
 440                 base += CDNS_MCP_CMD_WORD_LEN;
 441         }
 442
 443         if (defer)
 444                 return SDW_CMD_OK;
 445
 446         /* wait for timeout or response */
 447         time = wait_for_completion_timeout(&cdns->tx_complete,
 448                                            msecs_to_jiffies(CDNS_TX_TIMEOUT));
 449         if (!time) {
 450                 dev_err(cdns->dev, "IO transfer timed out, cmd %d device %d addr %x len %d\n",
 451                         cmd, msg->dev_num, msg->addr, msg->len);
 452                 msg->len = 0;
 453                 return SDW_CMD_TIMEOUT;
 454         }
 455
 456         return cdns_fill_msg_resp(cdns, msg, count, offset);
 457 }
 458
 459 static enum sdw_command_response
 460 cdns_program_scp_addr(struct sdw_cdns *cdns, struct sdw_msg *msg)
 461 {
 462         int nack = 0, no_ack = 0;
 463         unsigned long time;
 464         u32 data[2], base;
 465         int i;
 466
 467         /* Program the watermark level for RX FIFO */
 468         if (cdns->msg_count != CDNS_SCP_RX_FIFOLEVEL) {
 469                 cdns_writel(cdns, CDNS_MCP_FIFOLEVEL, CDNS_SCP_RX_FIFOLEVEL);
 470                 cdns->msg_count = CDNS_SCP_RX_FIFOLEVEL;
 471         }
 472
 473         data[0] = msg->dev_num << SDW_REG_SHIFT(CDNS_MCP_CMD_DEV_ADDR);
 474         data[0] |= 0x3 << SDW_REG_SHIFT(CDNS_MCP_CMD_COMMAND);
 475         data[1] = data[0];
 476
 477         data[0] |= SDW_SCP_ADDRPAGE1 << SDW_REG_SHIFT(CDNS_MCP_CMD_REG_ADDR_L);
 478         data[1] |= SDW_SCP_ADDRPAGE2 << SDW_REG_SHIFT(CDNS_MCP_CMD_REG_ADDR_L);
 479
 480         data[0] |= msg->addr_page1;
 481         data[1] |= msg->addr_page2;
 482
 483         base = CDNS_MCP_CMD_BASE;
 484         cdns_writel(cdns, base, data[0]);
 485         base += CDNS_MCP_CMD_WORD_LEN;
 486         cdns_writel(cdns, base, data[1]);
 487
 488         time = wait_for_completion_timeout(&cdns->tx_complete,
 489                                            msecs_to_jiffies(CDNS_TX_TIMEOUT));
 490         if (!time) {
 491                 dev_err(cdns->dev, "SCP Msg trf timed out\n");
 492                 msg->len = 0;
 493                 return SDW_CMD_TIMEOUT;
 494         }
 495
 496         /* check response the writes */
 497         for (i = 0; i < 2; i++) {
 498                 if (!(cdns->response_buf[i] & CDNS_MCP_RESP_ACK)) {
 499                         no_ack = 1;
 500                         dev_err(cdns->dev, "Program SCP Ack not received\n");
 501                         if (cdns->response_buf[i] & CDNS_MCP_RESP_NACK) {
 502                                 nack = 1;
 503                                 dev_err(cdns->dev, "Program SCP NACK received\n");
 504                         }
 505                 }
 506         }
 507
 508         /* For NACK, NO ack, don't return err if we are in Broadcast mode */
 509         if (nack) {
 510                 dev_err_ratelimited(cdns->dev,
 511                                     "SCP_addrpage NACKed for Slave %d\n", msg->dev_num);
 512                 return SDW_CMD_FAIL;
 513         } else if (no_ack) {
 514                 dev_dbg_ratelimited(cdns->dev,
 515                                     "SCP_addrpage ignored for Slave %d\n", msg->dev_num);
 516                 return SDW_CMD_IGNORED;
 517         }
 518
 519         return SDW_CMD_OK;
 520 }
 521
 522 static int cdns_prep_msg(struct sdw_cdns *cdns, struct sdw_msg *msg, int *cmd)
 523 {
 524         int ret;
 525
 526         if (msg->page) {
 527                 ret = cdns_program_scp_addr(cdns, msg);
 528                 if (ret) {
 529                         msg->len = 0;
 530                         return ret;
 531                 }
 532         }
 533
 534         switch (msg->flags) {
 535         case SDW_MSG_FLAG_READ:
 536                 *cmd = CDNS_MCP_CMD_READ;
 537                 break;
 538
 539         case SDW_MSG_FLAG_WRITE:
 540                 *cmd = CDNS_MCP_CMD_WRITE;
 541                 break;
 542
 543         default:
 544                 dev_err(cdns->dev, "Invalid msg cmd: %d\n", msg->flags);
 545                 return -EINVAL;
 546         }
 547
 548         return 0;
 549 }
 550
 551 enum sdw_command_response
 552 cdns_xfer_msg(struct sdw_bus *bus, struct sdw_msg *msg)
 553 {
 554         struct sdw_cdns *cdns = bus_to_cdns(bus);
 555         int cmd = 0, ret, i;
 556
 557         ret = cdns_prep_msg(cdns, msg, &cmd);
 558         if (ret)
 559                 return SDW_CMD_FAIL_OTHER;
 560
 561         for (i = 0; i < msg->len / CDNS_MCP_CMD_LEN; i++) {
 562                 ret = _cdns_xfer_msg(cdns, msg, cmd, i * CDNS_MCP_CMD_LEN,
 563                                      CDNS_MCP_CMD_LEN, false);
 564                 if (ret < 0)
 565                         goto exit;
 566         }
 567
 568         if (!(msg->len % CDNS_MCP_CMD_LEN))
 569                 goto exit;
 570
 571         ret = _cdns_xfer_msg(cdns, msg, cmd, i * CDNS_MCP_CMD_LEN,
 572                              msg->len % CDNS_MCP_CMD_LEN, false);
 573
 574 exit:
 575         return ret;
 576 }
 577 EXPORT_SYMBOL(cdns_xfer_msg);
 578
 579 enum sdw_command_response
 580 cdns_xfer_msg_defer(struct sdw_bus *bus,
 581                     struct sdw_msg *msg, struct sdw_defer *defer)
 582 {
 583         struct sdw_cdns *cdns = bus_to_cdns(bus);
 584         int cmd = 0, ret;
 585
 586         /* for defer only 1 message is supported */
 587         if (msg->len > 1)
 588                 return -ENOTSUPP;
 589
 590         ret = cdns_prep_msg(cdns, msg, &cmd);
 591         if (ret)
 592                 return SDW_CMD_FAIL_OTHER;
 593
 594         cdns->defer = defer;
 595         cdns->defer->length = msg->len;
 596
 597         return _cdns_xfer_msg(cdns, msg, cmd, 0, msg->len, true);
 598 }
 599 EXPORT_SYMBOL(cdns_xfer_msg_defer);
 600
 601 enum sdw_command_response
 602 cdns_reset_page_addr(struct sdw_bus *bus, unsigned int dev_num)
 603 {
 604         struct sdw_cdns *cdns = bus_to_cdns(bus);
 605         struct sdw_msg msg;
 606
 607         /* Create dummy message with valid device number */
 608         memset(&msg, 0, sizeof(msg));
 609         msg.dev_num = dev_num;
 610
 611         return cdns_program_scp_addr(cdns, &msg);
 612 }
 613 EXPORT_SYMBOL(cdns_reset_page_addr);
 614
 615 /*
 616  * IRQ handling
 617  */
 618
 619 static void cdns_read_response(struct sdw_cdns *cdns)
 620 {
 621         u32 num_resp, cmd_base;
 622         int i;
 623
 624         num_resp = cdns_readl(cdns, CDNS_MCP_FIFOSTAT);
 625         num_resp &= CDNS_MCP_RX_FIFO_AVAIL;
 626
 627         cmd_base = CDNS_MCP_CMD_BASE;
 628
 629         for (i = 0; i < num_resp; i++) {
 630                 cdns->response_buf[i] = cdns_readl(cdns, cmd_base);
 631                 cmd_base += CDNS_MCP_CMD_WORD_LEN;
 632         }
 633 }
 634
 635 static int cdns_update_slave_status(struct sdw_cdns *cdns,
 636                                     u32 slave0, u32 slave1)
 637 {
 638         enum sdw_slave_status status[SDW_MAX_DEVICES + 1];
 639         bool is_slave = false;
 640         u64 slave;
 641         u32 mask;
 642         int i, set_status;
 643
 644         /* combine the two status */
 645         slave = ((u64)slave1 << 32) | slave0;
 646         memset(status, 0, sizeof(status));
 647
 648         for (i = 0; i <= SDW_MAX_DEVICES; i++) {
 649                 mask = (slave >> (i * CDNS_MCP_SLAVE_STATUS_NUM)) &
 650                                 CDNS_MCP_SLAVE_STATUS_BITS;
 651                 if (!mask)
 652                         continue;
 653
 654                 is_slave = true;
 655                 set_status = 0;
 656
 657                 if (mask & CDNS_MCP_SLAVE_INTSTAT_RESERVED) {
 658                         status[i] = SDW_SLAVE_RESERVED;
 659                         set_status++;
 660                 }
 661
 662                 if (mask & CDNS_MCP_SLAVE_INTSTAT_ATTACHED) {
 663                         status[i] = SDW_SLAVE_ATTACHED;
 664                         set_status++;
 665                 }
 666
 667                 if (mask & CDNS_MCP_SLAVE_INTSTAT_ALERT) {
 668                         status[i] = SDW_SLAVE_ALERT;
 669                         set_status++;
 670                 }
 671
 672                 if (mask & CDNS_MCP_SLAVE_INTSTAT_NPRESENT) {
 673                         status[i] = SDW_SLAVE_UNATTACHED;
 674                         set_status++;
 675                 }
 676
 677                 /* first check if Slave reported multiple status */
 678                 if (set_status > 1) {
 679                         u32 val;
 680
 681                         dev_warn_ratelimited(cdns->dev,
 682                                              "Slave %d reported multiple Status: %d\n",
 683                                              i, mask);
 684
 685                         /* check latest status extracted from PING commands */
 686                         val = cdns_readl(cdns, CDNS_MCP_SLAVE_STAT);
 687                         val >>= (i * 2);
 688
 689                         switch (val & 0x3) {
 690                         case 0:
 691                                 status[i] = SDW_SLAVE_UNATTACHED;
 692                                 break;
 693                         case 1:
 694                                 status[i] = SDW_SLAVE_ATTACHED;
 695                                 break;
 696                         case 2:
 697                                 status[i] = SDW_SLAVE_ALERT;
 698                                 break;
 699                         case 3:
 700                         default:
 701                                 status[i] = SDW_SLAVE_RESERVED;
 702                                 break;
 703                         }
 704
 705                         dev_warn_ratelimited(cdns->dev,
 706                                              "Slave %d status updated to %d\n",
 707                                              i, status[i]);
 708
 709                 }
 710         }
 711
 712         if (is_slave)
 713                 return sdw_handle_slave_status(&cdns->bus, status);
 714
 715         return 0;
 716 }
 717
 718 /**
 719  * sdw_cdns_irq() - Cadence interrupt handler
 720  * @irq: irq number
 721  * @dev_id: irq context
 722  */
 723 irqreturn_t sdw_cdns_irq(int irq, void *dev_id)
 724 {
 725         struct sdw_cdns *cdns = dev_id;
 726         u32 int_status;
 727         int ret = IRQ_HANDLED;
 728
 729         /* Check if the link is up */
 730         if (!cdns->link_up)
 731                 return IRQ_NONE;
 732
 733         int_status = cdns_readl(cdns, CDNS_MCP_INTSTAT);
 734
 735         /* check for reserved values read as zero */
 736         if (int_status & CDNS_MCP_INT_RESERVED)
 737                 return IRQ_NONE;
 738
 739         if (!(int_status & CDNS_MCP_INT_IRQ))
 740                 return IRQ_NONE;
 741
 742         if (int_status & CDNS_MCP_INT_RX_WL) {
 743                 cdns_read_response(cdns);
 744
 745                 if (cdns->defer) {
 746                         cdns_fill_msg_resp(cdns, cdns->defer->msg,
 747                                            cdns->defer->length, 0);
 748                         complete(&cdns->defer->complete);
 749                         cdns->defer = NULL;
 750                 } else {
 751                         complete(&cdns->tx_complete);
 752                 }
 753         }
 754
 755         if (int_status & CDNS_MCP_INT_PARITY) {
 756                 /* Parity error detected by Master */
 757                 dev_err_ratelimited(cdns->dev, "Parity error\n");
 758         }
 759
 760         if (int_status & CDNS_MCP_INT_CTRL_CLASH) {
 761                 /* Slave is driving bit slot during control word */
 762                 dev_err_ratelimited(cdns->dev, "Bus clash for control word\n");
 763         }
 764
 765         if (int_status & CDNS_MCP_INT_DATA_CLASH) {
 766                 /*
 767                  * Multiple slaves trying to drive bit slot, or issue with
 768                  * ownership of data bits or Slave gone bonkers
 769                  */
 770                 dev_err_ratelimited(cdns->dev, "Bus clash for data word\n");
 771         }
 772
 773         if (int_status & CDNS_MCP_INT_SLAVE_MASK) {
 774                 /* Mask the Slave interrupt and wake thread */
 775                 cdns_updatel(cdns, CDNS_MCP_INTMASK,
 776                              CDNS_MCP_INT_SLAVE_MASK, 0);
 777
 778                 int_status &= ~CDNS_MCP_INT_SLAVE_MASK;
 779                 ret = IRQ_WAKE_THREAD;
 780         }
 781
 782         cdns_writel(cdns, CDNS_MCP_INTSTAT, int_status);
 783         return ret;
 784 }
 785 EXPORT_SYMBOL(sdw_cdns_irq);
 786
 787 /**
 788  * sdw_cdns_thread() - Cadence irq thread handler
 789  * @irq: irq number
 790  * @dev_id: irq context
 791  */
 792 irqreturn_t sdw_cdns_thread(int irq, void *dev_id)
 793 {
 794         struct sdw_cdns *cdns = dev_id;
 795         u32 slave0, slave1;
 796
 797         dev_dbg_ratelimited(cdns->dev, "Slave status change\n");
 798
 799         slave0 = cdns_readl(cdns, CDNS_MCP_SLAVE_INTSTAT0);
 800         slave1 = cdns_readl(cdns, CDNS_MCP_SLAVE_INTSTAT1);
 801
 802         cdns_update_slave_status(cdns, slave0, slave1);
 803         cdns_writel(cdns, CDNS_MCP_SLAVE_INTSTAT0, slave0);
 804         cdns_writel(cdns, CDNS_MCP_SLAVE_INTSTAT1, slave1);
 805
 806         /* clear and unmask Slave interrupt now */
 807         cdns_writel(cdns, CDNS_MCP_INTSTAT, CDNS_MCP_INT_SLAVE_MASK);
 808         cdns_updatel(cdns, CDNS_MCP_INTMASK,
 809                      CDNS_MCP_INT_SLAVE_MASK, CDNS_MCP_INT_SLAVE_MASK);
 810
 811         return IRQ_HANDLED;
 812 }
 813 EXPORT_SYMBOL(sdw_cdns_thread);
 814
 815 /*
 816  * init routines
 817  */
 818
 819 /**
 820  * sdw_cdns_exit_reset() - Program reset parameters and start bus operations
 821  * @cdns: Cadence instance
 822  */
 823 int sdw_cdns_exit_reset(struct sdw_cdns *cdns)
 824 {
 825         /* program maximum length reset to be safe */
 826         cdns_updatel(cdns, CDNS_MCP_CONTROL,
 827                      CDNS_MCP_CONTROL_RST_DELAY,
 828                      CDNS_MCP_CONTROL_RST_DELAY);
 829
 830         /* use hardware generated reset */
 831         cdns_updatel(cdns, CDNS_MCP_CONTROL,
 832                      CDNS_MCP_CONTROL_HW_RST,
 833                      CDNS_MCP_CONTROL_HW_RST);
 834
 835         /* enable bus operations with clock and data */
 836         cdns_updatel(cdns, CDNS_MCP_CONFIG,
 837                      CDNS_MCP_CONFIG_OP,
 838                      CDNS_MCP_CONFIG_OP_NORMAL);
 839
 840         /* commit changes */
 841         return cdns_update_config(cdns);
 842 }
 843 EXPORT_SYMBOL(sdw_cdns_exit_reset);
 844
 845 /**
 846  * sdw_cdns_enable_interrupt() - Enable SDW interrupts
 847  * @cdns: Cadence instance
 848  * @state: True if we are trying to enable interrupt.
 849  */
 850 int sdw_cdns_enable_interrupt(struct sdw_cdns *cdns, bool state)
 851 {
 852         u32 slave_intmask0 = 0;
 853         u32 slave_intmask1 = 0;
 854         u32 mask = 0;
 855
 856         if (!state)
 857                 goto update_masks;
 858
 859         slave_intmask0 = CDNS_MCP_SLAVE_INTMASK0_MASK;
 860         slave_intmask1 = CDNS_MCP_SLAVE_INTMASK1_MASK;
 861
 862         /* enable detection of all slave state changes */
 863         mask = CDNS_MCP_INT_SLAVE_MASK;
 864
 865         /* enable detection of bus issues */
 866         mask |= CDNS_MCP_INT_CTRL_CLASH | CDNS_MCP_INT_DATA_CLASH |
 867                 CDNS_MCP_INT_PARITY;
 868
 869         /* no detection of port interrupts for now */
 870
 871         /* enable detection of RX fifo level */
 872         mask |= CDNS_MCP_INT_RX_WL;
 873
 874         /*
 875          * CDNS_MCP_INT_IRQ needs to be set otherwise all previous
 876          * settings are irrelevant
 877          */
 878         mask |= CDNS_MCP_INT_IRQ;
 879
 880         if (interrupt_mask) /* parameter override */
 881                 mask = interrupt_mask;
 882
 883 update_masks:
 884         /* clear slave interrupt status before enabling interrupt */
 885         if (state) {
 886                 u32 slave_state;
 887
 888                 slave_state = cdns_readl(cdns, CDNS_MCP_SLAVE_INTSTAT0);
 889                 cdns_writel(cdns, CDNS_MCP_SLAVE_INTSTAT0, slave_state);
 890                 slave_state = cdns_readl(cdns, CDNS_MCP_SLAVE_INTSTAT1);
 891                 cdns_writel(cdns, CDNS_MCP_SLAVE_INTSTAT1, slave_state);
 892         }
 893
 894         cdns_writel(cdns, CDNS_MCP_SLAVE_INTMASK0, slave_intmask0);
 895         cdns_writel(cdns, CDNS_MCP_SLAVE_INTMASK1, slave_intmask1);
 896         cdns_writel(cdns, CDNS_MCP_INTMASK, mask);
 897
 898         return 0;
 899 }
 900 EXPORT_SYMBOL(sdw_cdns_enable_interrupt);
 901
 902 static int cdns_allocate_pdi(struct sdw_cdns *cdns,
 903                              struct sdw_cdns_pdi **stream,
 904                              u32 num, u32 pdi_offset)
 905 {
 906         struct sdw_cdns_pdi *pdi;
 907         int i;
 908
 909         if (!num)
 910                 return 0;
 911
 912         pdi = devm_kcalloc(cdns->dev, num, sizeof(*pdi), GFP_KERNEL);
 913         if (!pdi)
 914                 return -ENOMEM;
 915
 916         for (i = 0; i < num; i++) {
 917                 pdi[i].num = i + pdi_offset;
 918         }
 919
 920         *stream = pdi;
 921         return 0;
 922 }
 923
 924 /**
 925  * sdw_cdns_pdi_init() - PDI initialization routine
 926  *
 927  * @cdns: Cadence instance
 928  * @config: Stream configurations
 929  */
 930 int sdw_cdns_pdi_init(struct sdw_cdns *cdns,
 931                       struct sdw_cdns_stream_config config)
 932 {
 933         struct sdw_cdns_streams *stream;
 934         int offset;
 935         int ret;
 936
 937         cdns->pcm.num_bd = config.pcm_bd;
 938         cdns->pcm.num_in = config.pcm_in;
 939         cdns->pcm.num_out = config.pcm_out;
 940         cdns->pdm.num_bd = config.pdm_bd;
 941         cdns->pdm.num_in = config.pdm_in;
 942         cdns->pdm.num_out = config.pdm_out;
 943
 944         /* Allocate PDIs for PCMs */
 945         stream = &cdns->pcm;
 946
 947         /* we allocate PDI0 and PDI1 which are used for Bulk */
 948         offset = 0;
 949
 950         ret = cdns_allocate_pdi(cdns, &stream->bd,
 951                                 stream->num_bd, offset);
 952         if (ret)
 953                 return ret;
 954
 955         offset += stream->num_bd;
 956
 957         ret = cdns_allocate_pdi(cdns, &stream->in,
 958                                 stream->num_in, offset);
 959         if (ret)
 960                 return ret;
 961
 962         offset += stream->num_in;
 963
 964         ret = cdns_allocate_pdi(cdns, &stream->out,
 965                                 stream->num_out, offset);
 966         if (ret)
 967                 return ret;
 968
 969         /* Update total number of PCM PDIs */
 970         stream->num_pdi = stream->num_bd + stream->num_in + stream->num_out;
 971         cdns->num_ports = stream->num_pdi;
 972
 973         /* Allocate PDIs for PDMs */
 974         stream = &cdns->pdm;
 975         ret = cdns_allocate_pdi(cdns, &stream->bd,
 976                                 stream->num_bd, offset);
 977         if (ret)
 978                 return ret;
 979
 980         offset += stream->num_bd;
 981
 982         ret = cdns_allocate_pdi(cdns, &stream->in,
 983                                 stream->num_in, offset);
 984         if (ret)
 985                 return ret;
 986
 987         offset += stream->num_in;
 988
 989         ret = cdns_allocate_pdi(cdns, &stream->out,
 990                                 stream->num_out, offset);
 991
 992         if (ret)
 993                 return ret;
 994
 995         /* Update total number of PDM PDIs */
 996         stream->num_pdi = stream->num_bd + stream->num_in + stream->num_out;
 997         cdns->num_ports += stream->num_pdi;
 998
 999         return 0;
1000 }
1001 EXPORT_SYMBOL(sdw_cdns_pdi_init);
1002
1003 static u32 cdns_set_initial_frame_shape(int n_rows, int n_cols)
1004 {
1005         u32 val;
1006         int c;
1007         int r;
1008
1009         r = sdw_find_row_index(n_rows);
1010         c = sdw_find_col_index(n_cols) & CDNS_MCP_FRAME_SHAPE_COL_MASK;
1011
1012         val = (r << CDNS_MCP_FRAME_SHAPE_ROW_OFFSET) | c;
1013
1014         return val;
1015 }
1016
1017 /**
1018  * sdw_cdns_init() - Cadence initialization
1019  * @cdns: Cadence instance
1020  */
1021 int sdw_cdns_init(struct sdw_cdns *cdns, bool clock_stop_exit)
1022 {
1023         struct sdw_bus *bus = &cdns->bus;
1024         struct sdw_master_prop *prop = &bus->prop;
1025         u32 val;
1026         int divider;
1027         int ret;
1028
1029         if (clock_stop_exit) {
1030                 ret = cdns_clear_bit(cdns, CDNS_MCP_CONTROL,
1031                                      CDNS_MCP_CONTROL_CLK_STOP_CLR);
1032                 if (ret < 0) {
1033                         dev_err(cdns->dev, "Couldn't exit from clock stop\n");
1034                         return ret;
1035                 }
1036         }
1037
1038         /* Set clock divider */
1039         divider = (prop->mclk_freq / prop->max_clk_freq) - 1;
1040
1041         cdns_updatel(cdns, CDNS_MCP_CLK_CTRL0,
1042                      CDNS_MCP_CLK_MCLKD_MASK, divider);
1043         cdns_updatel(cdns, CDNS_MCP_CLK_CTRL1,
1044                      CDNS_MCP_CLK_MCLKD_MASK, divider);
1045
1046         /*
1047          * Frame shape changes after initialization have to be done
1048          * with the bank switch mechanism
1049          */
1050         val = cdns_set_initial_frame_shape(prop->default_row,
1051                                            prop->default_col);
1052         cdns_writel(cdns, CDNS_MCP_FRAME_SHAPE_INIT, val);
1053
1054         /* Set SSP interval to default value */
1055         cdns_writel(cdns, CDNS_MCP_SSP_CTRL0, CDNS_DEFAULT_SSP_INTERVAL);
1056         cdns_writel(cdns, CDNS_MCP_SSP_CTRL1, CDNS_DEFAULT_SSP_INTERVAL);
1057
1058         /* flush command FIFOs */
1059         cdns_updatel(cdns, CDNS_MCP_CONTROL, CDNS_MCP_CONTROL_CMD_RST,
1060                      CDNS_MCP_CONTROL_CMD_RST);
1061
1062         /* Set cmd accept mode */
1063         cdns_updatel(cdns, CDNS_MCP_CONTROL, CDNS_MCP_CONTROL_CMD_ACCEPT,
1064                      CDNS_MCP_CONTROL_CMD_ACCEPT);
1065
1066         /* Configure mcp config */
1067         val = cdns_readl(cdns, CDNS_MCP_CONFIG);
1068
1069         /* Set Max cmd retry to 15 */
1070         val |= CDNS_MCP_CONFIG_MCMD_RETRY;
1071
1072         /* Set frame delay between PREQ and ping frame to 15 frames */
1073         val |= 0xF << SDW_REG_SHIFT(CDNS_MCP_CONFIG_MPREQ_DELAY);
1074
1075         /* Disable auto bus release */
1076         val &= ~CDNS_MCP_CONFIG_BUS_REL;
1077
1078         /* Disable sniffer mode */
1079         val &= ~CDNS_MCP_CONFIG_SNIFFER;
1080
1081         /* Set cmd mode for Tx and Rx cmds */
1082         val &= ~CDNS_MCP_CONFIG_CMD;
1083
1084         cdns_writel(cdns, CDNS_MCP_CONFIG, val);
1085
1086         /* commit changes */
1087         return cdns_update_config(cdns);
1088 }
1089 EXPORT_SYMBOL(sdw_cdns_init);
1090
1091 int cdns_bus_conf(struct sdw_bus *bus, struct sdw_bus_params *params)
1092 {
1093         struct sdw_master_prop *prop = &bus->prop;
1094         struct sdw_cdns *cdns = bus_to_cdns(bus);
1095         int mcp_clkctrl_off;
1096         int divider;
1097
1098         if (!params->curr_dr_freq) {
1099                 dev_err(cdns->dev, "NULL curr_dr_freq\n");
1100                 return -EINVAL;
1101         }
1102
1103         divider = prop->mclk_freq * SDW_DOUBLE_RATE_FACTOR /
1104                 params->curr_dr_freq;
1105         divider--; /* divider is 1/(N+1) */
1106
1107         if (params->next_bank)
1108                 mcp_clkctrl_off = CDNS_MCP_CLK_CTRL1;
1109         else
1110                 mcp_clkctrl_off = CDNS_MCP_CLK_CTRL0;
1111
1112         cdns_updatel(cdns, mcp_clkctrl_off, CDNS_MCP_CLK_MCLKD_MASK, divider);
1113
1114         return 0;
1115 }
1116 EXPORT_SYMBOL(cdns_bus_conf);
1117
1118 static int cdns_port_params(struct sdw_bus *bus,
1119                             struct sdw_port_params *p_params, unsigned int bank)
1120 {
1121         struct sdw_cdns *cdns = bus_to_cdns(bus);
1122         int dpn_config = 0, dpn_config_off;
1123
1124         if (bank)
1125                 dpn_config_off = CDNS_DPN_B1_CONFIG(p_params->num);
1126         else
1127                 dpn_config_off = CDNS_DPN_B0_CONFIG(p_params->num);
1128
1129         dpn_config = cdns_readl(cdns, dpn_config_off);
1130
1131         dpn_config |= ((p_params->bps - 1) <<
1132                                 SDW_REG_SHIFT(CDNS_DPN_CONFIG_WL));
1133         dpn_config |= (p_params->flow_mode <<
1134                                 SDW_REG_SHIFT(CDNS_DPN_CONFIG_PORT_FLOW));
1135         dpn_config |= (p_params->data_mode <<
1136                                 SDW_REG_SHIFT(CDNS_DPN_CONFIG_PORT_DAT));
1137
1138         cdns_writel(cdns, dpn_config_off, dpn_config);
1139
1140         return 0;
1141 }
1142
1143 static int cdns_transport_params(struct sdw_bus *bus,
1144                                  struct sdw_transport_params *t_params,
1145                                  enum sdw_reg_bank bank)
1146 {
1147         struct sdw_cdns *cdns = bus_to_cdns(bus);
1148         int dpn_offsetctrl = 0, dpn_offsetctrl_off;
1149         int dpn_config = 0, dpn_config_off;
1150         int dpn_hctrl = 0, dpn_hctrl_off;
1151         int num = t_params->port_num;
1152         int dpn_samplectrl_off;
1153
1154         /*
1155          * Note: Only full data port is supported on the Master side for
1156          * both PCM and PDM ports.
1157          */
1158
1159         if (bank) {
1160                 dpn_config_off = CDNS_DPN_B1_CONFIG(num);
1161                 dpn_samplectrl_off = CDNS_DPN_B1_SAMPLE_CTRL(num);
1162                 dpn_hctrl_off = CDNS_DPN_B1_HCTRL(num);
1163                 dpn_offsetctrl_off = CDNS_DPN_B1_OFFSET_CTRL(num);
1164         } else {
1165                 dpn_config_off = CDNS_DPN_B0_CONFIG(num);
1166                 dpn_samplectrl_off = CDNS_DPN_B0_SAMPLE_CTRL(num);
1167                 dpn_hctrl_off = CDNS_DPN_B0_HCTRL(num);
1168                 dpn_offsetctrl_off = CDNS_DPN_B0_OFFSET_CTRL(num);
1169         }
1170
1171         dpn_config = cdns_readl(cdns, dpn_config_off);
1172
1173         dpn_config |= (t_params->blk_grp_ctrl <<
1174                                 SDW_REG_SHIFT(CDNS_DPN_CONFIG_BGC));
1175         dpn_config |= (t_params->blk_pkg_mode <<
1176                                 SDW_REG_SHIFT(CDNS_DPN_CONFIG_BPM));
1177         cdns_writel(cdns, dpn_config_off, dpn_config);
1178
1179         dpn_offsetctrl |= (t_params->offset1 <<
1180                                 SDW_REG_SHIFT(CDNS_DPN_OFFSET_CTRL_1));
1181         dpn_offsetctrl |= (t_params->offset2 <<
1182                                 SDW_REG_SHIFT(CDNS_DPN_OFFSET_CTRL_2));
1183         cdns_writel(cdns, dpn_offsetctrl_off,  dpn_offsetctrl);
1184
1185         dpn_hctrl |= (t_params->hstart <<
1186                                 SDW_REG_SHIFT(CDNS_DPN_HCTRL_HSTART));
1187         dpn_hctrl |= (t_params->hstop << SDW_REG_SHIFT(CDNS_DPN_HCTRL_HSTOP));
1188         dpn_hctrl |= (t_params->lane_ctrl <<
1189                                 SDW_REG_SHIFT(CDNS_DPN_HCTRL_LCTRL));
1190
1191         cdns_writel(cdns, dpn_hctrl_off, dpn_hctrl);
1192         cdns_writel(cdns, dpn_samplectrl_off, (t_params->sample_interval - 1));
1193
1194         return 0;
1195 }
1196
1197 static int cdns_port_enable(struct sdw_bus *bus,
1198                             struct sdw_enable_ch *enable_ch, unsigned int bank)
1199 {
1200         struct sdw_cdns *cdns = bus_to_cdns(bus);
1201         int dpn_chnen_off, ch_mask;
1202
1203         if (bank)
1204                 dpn_chnen_off = CDNS_DPN_B1_CH_EN(enable_ch->port_num);
1205         else
1206                 dpn_chnen_off = CDNS_DPN_B0_CH_EN(enable_ch->port_num);
1207
1208         ch_mask = enable_ch->ch_mask * enable_ch->enable;
1209         cdns_writel(cdns, dpn_chnen_off, ch_mask);
1210
1211         return 0;
1212 }
1213
1214 static const struct sdw_master_port_ops cdns_port_ops = {
1215         .dpn_set_port_params = cdns_port_params,
1216         .dpn_set_port_transport_params = cdns_transport_params,
1217         .dpn_port_enable_ch = cdns_port_enable,
1218 };
1219
1220 /**
1221  * sdw_cdns_probe() - Cadence probe routine
1222  * @cdns: Cadence instance
1223  */
1224 int sdw_cdns_probe(struct sdw_cdns *cdns)
1225 {
1226         init_completion(&cdns->tx_complete);
1227         cdns->bus.port_ops = &cdns_port_ops;
1228
1229         return 0;
1230 }
1231 EXPORT_SYMBOL(sdw_cdns_probe);
1232
1233 int cdns_set_sdw_stream(struct snd_soc_dai *dai,
1234                         void *stream, bool pcm, int direction)
1235 {
1236         struct sdw_cdns *cdns = snd_soc_dai_get_drvdata(dai);
1237         struct sdw_cdns_dma_data *dma;
1238
1239         dma = kzalloc(sizeof(*dma), GFP_KERNEL);
1240         if (!dma)
1241                 return -ENOMEM;
1242
1243         if (pcm)
1244                 dma->stream_type = SDW_STREAM_PCM;
1245         else
1246                 dma->stream_type = SDW_STREAM_PDM;
1247
1248         dma->bus = &cdns->bus;
1249         dma->link_id = cdns->instance;
1250
1251         dma->stream = stream;
1252
1253         if (direction == SNDRV_PCM_STREAM_PLAYBACK)
1254                 dai->playback_dma_data = dma;
1255         else
1256                 dai->capture_dma_data = dma;
1257
1258         return 0;
1259 }
1260 EXPORT_SYMBOL(cdns_set_sdw_stream);
1261
1262 /**
1263  * cdns_find_pdi() - Find a free PDI
1264  *
1265  * @cdns: Cadence instance
1266  * @offset: Starting offset
1267  * @num: Number of PDIs
1268  * @pdi: PDI instances
1269  * @dai_id: DAI id
1270  *
1271  * Find a PDI for a given PDI array. The PDI num and dai_id are
1272  * expected to match, return NULL otherwise.
1273  */
1274 static struct sdw_cdns_pdi *cdns_find_pdi(struct sdw_cdns *cdns,
1275                                           unsigned int offset,
1276                                           unsigned int num,
1277                                           struct sdw_cdns_pdi *pdi,
1278                                           int dai_id)
1279 {
1280         int i;
1281
1282         for (i = offset; i < offset + num; i++)
1283                 if (pdi[i].num == dai_id)
1284                         return &pdi[i];
1285
1286         return NULL;
1287 }
1288
1289 /**
1290  * sdw_cdns_config_stream: Configure a stream
1291  *
1292  * @cdns: Cadence instance
1293  * @ch: Channel count
1294  * @dir: Data direction
1295  * @pdi: PDI to be used
1296  */
1297 void sdw_cdns_config_stream(struct sdw_cdns *cdns,
1298                             u32 ch, u32 dir, struct sdw_cdns_pdi *pdi)
1299 {
1300         u32 offset, val = 0;
1301
1302         if (dir == SDW_DATA_DIR_RX)
1303                 val = CDNS_PORTCTRL_DIRN;
1304
1305         offset = CDNS_PORTCTRL + pdi->num * CDNS_PORT_OFFSET;
1306         cdns_updatel(cdns, offset, CDNS_PORTCTRL_DIRN, val);
1307
1308         val = pdi->num;
1309         val |= ((1 << ch) - 1) << SDW_REG_SHIFT(CDNS_PDI_CONFIG_CHANNEL);
1310         cdns_writel(cdns, CDNS_PDI_CONFIG(pdi->num), val);
1311 }
1312 EXPORT_SYMBOL(sdw_cdns_config_stream);
1313
1314 /**
1315  * sdw_cdns_alloc_pdi() - Allocate a PDI
1316  *
1317  * @cdns: Cadence instance
1318  * @stream: Stream to be allocated
1319  * @ch: Channel count
1320  * @dir: Data direction
1321  * @dai_id: DAI id
1322  */
1323 struct sdw_cdns_pdi *sdw_cdns_alloc_pdi(struct sdw_cdns *cdns,
1324                                         struct sdw_cdns_streams *stream,
1325                                         u32 ch, u32 dir, int dai_id)
1326 {
1327         struct sdw_cdns_pdi *pdi = NULL;
1328
1329         if (dir == SDW_DATA_DIR_RX)
1330                 pdi = cdns_find_pdi(cdns, 0, stream->num_in, stream->in,
1331                                     dai_id);
1332         else
1333                 pdi = cdns_find_pdi(cdns, 0, stream->num_out, stream->out,
1334                                     dai_id);
1335
1336         /* check if we found a PDI, else find in bi-directional */
1337         if (!pdi)
1338                 pdi = cdns_find_pdi(cdns, 2, stream->num_bd, stream->bd,
1339                                     dai_id);
1340
1341         if (pdi) {
1342                 pdi->l_ch_num = 0;
1343                 pdi->h_ch_num = ch - 1;
1344                 pdi->dir = dir;
1345                 pdi->ch_count = ch;
1346         }
1347
1348         return pdi;
1349 }
1350 EXPORT_SYMBOL(sdw_cdns_alloc_pdi);
1351
1352 MODULE_LICENSE("Dual BSD/GPL");
1353 MODULE_DESCRIPTION("Cadence Soundwire Library");