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_WAKEUP                     BIT(16)
  78 #define CDNS_MCP_INT_SLAVE_RSVD                 BIT(15)
  79 #define CDNS_MCP_INT_SLAVE_ALERT                BIT(14)
  80 #define CDNS_MCP_INT_SLAVE_ATTACH               BIT(13)
  81 #define CDNS_MCP_INT_SLAVE_NATTACH              BIT(12)
  82 #define CDNS_MCP_INT_SLAVE_MASK                 GENMASK(15, 12)
  83 #define CDNS_MCP_INT_DPINT                      BIT(11)
  84 #define CDNS_MCP_INT_CTRL_CLASH                 BIT(10)
  85 #define CDNS_MCP_INT_DATA_CLASH                 BIT(9)
  86 #define CDNS_MCP_INT_PARITY                     BIT(8)
  87 #define CDNS_MCP_INT_CMD_ERR                    BIT(7)
  88 #define CDNS_MCP_INT_RX_NE                      BIT(3)
  89 #define CDNS_MCP_INT_RX_WL                      BIT(2)
  90 #define CDNS_MCP_INT_TXE                        BIT(1)
  91 #define CDNS_MCP_INT_TXF                        BIT(0)
  92
  93 #define CDNS_MCP_INTSET                         0x4C
  94
  95 #define CDNS_MCP_SLAVE_STAT                     0x50
  96 #define CDNS_MCP_SLAVE_STAT_MASK                GENMASK(1, 0)
  97
  98 #define CDNS_MCP_SLAVE_INTSTAT0                 0x54
  99 #define CDNS_MCP_SLAVE_INTSTAT1                 0x58
 100 #define CDNS_MCP_SLAVE_INTSTAT_NPRESENT         BIT(0)
 101 #define CDNS_MCP_SLAVE_INTSTAT_ATTACHED         BIT(1)
 102 #define CDNS_MCP_SLAVE_INTSTAT_ALERT            BIT(2)
 103 #define CDNS_MCP_SLAVE_INTSTAT_RESERVED         BIT(3)
 104 #define CDNS_MCP_SLAVE_STATUS_BITS              GENMASK(3, 0)
 105 #define CDNS_MCP_SLAVE_STATUS_NUM               4
 106
 107 #define CDNS_MCP_SLAVE_INTMASK0                 0x5C
 108 #define CDNS_MCP_SLAVE_INTMASK1                 0x60
 109
 110 #define CDNS_MCP_SLAVE_INTMASK0_MASK            GENMASK(31, 0)
 111 #define CDNS_MCP_SLAVE_INTMASK1_MASK            GENMASK(15, 0)
 112
 113 #define CDNS_MCP_PORT_INTSTAT                   0x64
 114 #define CDNS_MCP_PDI_STAT                       0x6C
 115
 116 #define CDNS_MCP_FIFOLEVEL                      0x78
 117 #define CDNS_MCP_FIFOSTAT                       0x7C
 118 #define CDNS_MCP_RX_FIFO_AVAIL                  GENMASK(5, 0)
 119
 120 #define CDNS_MCP_CMD_BASE                       0x80
 121 #define CDNS_MCP_RESP_BASE                      0x80
 122 #define CDNS_MCP_CMD_LEN                        0x20
 123 #define CDNS_MCP_CMD_WORD_LEN                   0x4
 124
 125 #define CDNS_MCP_CMD_SSP_TAG                    BIT(31)
 126 #define CDNS_MCP_CMD_COMMAND                    GENMASK(30, 28)
 127 #define CDNS_MCP_CMD_DEV_ADDR                   GENMASK(27, 24)
 128 #define CDNS_MCP_CMD_REG_ADDR_H                 GENMASK(23, 16)
 129 #define CDNS_MCP_CMD_REG_ADDR_L                 GENMASK(15, 8)
 130 #define CDNS_MCP_CMD_REG_DATA                   GENMASK(7, 0)
 131
 132 #define CDNS_MCP_CMD_READ                       2
 133 #define CDNS_MCP_CMD_WRITE                      3
 134
 135 #define CDNS_MCP_RESP_RDATA                     GENMASK(15, 8)
 136 #define CDNS_MCP_RESP_ACK                       BIT(0)
 137 #define CDNS_MCP_RESP_NACK                      BIT(1)
 138
 139 #define CDNS_DP_SIZE                            128
 140
 141 #define CDNS_DPN_B0_CONFIG(n)                   (0x100 + CDNS_DP_SIZE * (n))
 142 #define CDNS_DPN_B0_CH_EN(n)                    (0x104 + CDNS_DP_SIZE * (n))
 143 #define CDNS_DPN_B0_SAMPLE_CTRL(n)              (0x108 + CDNS_DP_SIZE * (n))
 144 #define CDNS_DPN_B0_OFFSET_CTRL(n)              (0x10C + CDNS_DP_SIZE * (n))
 145 #define CDNS_DPN_B0_HCTRL(n)                    (0x110 + CDNS_DP_SIZE * (n))
 146 #define CDNS_DPN_B0_ASYNC_CTRL(n)               (0x114 + CDNS_DP_SIZE * (n))
 147
 148 #define CDNS_DPN_B1_CONFIG(n)                   (0x118 + CDNS_DP_SIZE * (n))
 149 #define CDNS_DPN_B1_CH_EN(n)                    (0x11C + CDNS_DP_SIZE * (n))
 150 #define CDNS_DPN_B1_SAMPLE_CTRL(n)              (0x120 + CDNS_DP_SIZE * (n))
 151 #define CDNS_DPN_B1_OFFSET_CTRL(n)              (0x124 + CDNS_DP_SIZE * (n))
 152 #define CDNS_DPN_B1_HCTRL(n)                    (0x128 + CDNS_DP_SIZE * (n))
 153 #define CDNS_DPN_B1_ASYNC_CTRL(n)               (0x12C + CDNS_DP_SIZE * (n))
 154
 155 #define CDNS_DPN_CONFIG_BPM                     BIT(18)
 156 #define CDNS_DPN_CONFIG_BGC                     GENMASK(17, 16)
 157 #define CDNS_DPN_CONFIG_WL                      GENMASK(12, 8)
 158 #define CDNS_DPN_CONFIG_PORT_DAT                GENMASK(3, 2)
 159 #define CDNS_DPN_CONFIG_PORT_FLOW               GENMASK(1, 0)
 160
 161 #define CDNS_DPN_SAMPLE_CTRL_SI                 GENMASK(15, 0)
 162
 163 #define CDNS_DPN_OFFSET_CTRL_1                  GENMASK(7, 0)
 164 #define CDNS_DPN_OFFSET_CTRL_2                  GENMASK(15, 8)
 165
 166 #define CDNS_DPN_HCTRL_HSTOP                    GENMASK(3, 0)
 167 #define CDNS_DPN_HCTRL_HSTART                   GENMASK(7, 4)
 168 #define CDNS_DPN_HCTRL_LCTRL                    GENMASK(10, 8)
 169
 170 #define CDNS_PORTCTRL                           0x130
 171 #define CDNS_PORTCTRL_DIRN                      BIT(7)
 172 #define CDNS_PORTCTRL_BANK_INVERT               BIT(8)
 173
 174 #define CDNS_PORT_OFFSET                        0x80
 175
 176 #define CDNS_PDI_CONFIG(n)                      (0x1100 + (n) * 16)
 177
 178 #define CDNS_PDI_CONFIG_SOFT_RESET              BIT(24)
 179 #define CDNS_PDI_CONFIG_CHANNEL                 GENMASK(15, 8)
 180 #define CDNS_PDI_CONFIG_PORT                    GENMASK(4, 0)
 181
 182 /* Driver defaults */
 183 #define CDNS_DEFAULT_SSP_INTERVAL               0x18
 184 #define CDNS_TX_TIMEOUT                         2000
 185
 186 #define CDNS_PCM_PDI_OFFSET                     0x2
 187 #define CDNS_PDM_PDI_OFFSET                     0x6
 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         /*
 299          * in sdw_cdns_pdi_init() we filter out the Bulk PDIs,
 300          * so the indices need to be corrected again
 301          */
 302         num_ports = cdns->num_ports + CDNS_PCM_PDI_OFFSET;
 303
 304         for (i = 0; i < num_ports; i++) {
 305                 ret += scnprintf(buf + ret, RD_BUF - ret,
 306                                  "\nDP-%d\n", i);
 307                 for (j = CDNS_DPN_B0_CONFIG(i);
 308                      j < CDNS_DPN_B0_ASYNC_CTRL(i); j += sizeof(u32))
 309                         ret += cdns_sprintf(cdns, buf, ret, j);
 310         }
 311
 312         ret += scnprintf(buf + ret, RD_BUF - ret,
 313                          "\nDPn B1 Registers\n");
 314         for (i = 0; i < num_ports; i++) {
 315                 ret += scnprintf(buf + ret, RD_BUF - ret,
 316                                  "\nDP-%d\n", i);
 317
 318                 for (j = CDNS_DPN_B1_CONFIG(i);
 319                      j < CDNS_DPN_B1_ASYNC_CTRL(i); j += sizeof(u32))
 320                         ret += cdns_sprintf(cdns, buf, ret, j);
 321         }
 322
 323         ret += scnprintf(buf + ret, RD_BUF - ret,
 324                          "\nDPn Control Registers\n");
 325         for (i = 0; i < num_ports; i++)
 326                 ret += cdns_sprintf(cdns, buf, ret,
 327                                 CDNS_PORTCTRL + i * CDNS_PORT_OFFSET);
 328
 329         ret += scnprintf(buf + ret, RD_BUF - ret,
 330                          "\nPDIn Config Registers\n");
 331
 332         /* number of PDI and ports is interchangeable */
 333         for (i = 0; i < num_ports; i++)
 334                 ret += cdns_sprintf(cdns, buf, ret, CDNS_PDI_CONFIG(i));
 335
 336         seq_printf(s, "%s", buf);
 337         kfree(buf);
 338
 339         return 0;
 340 }
 341 DEFINE_SHOW_ATTRIBUTE(cdns_reg);
 342
 343 /**
 344  * sdw_cdns_debugfs_init() - Cadence debugfs init
 345  * @cdns: Cadence instance
 346  * @root: debugfs root
 347  */
 348 void sdw_cdns_debugfs_init(struct sdw_cdns *cdns, struct dentry *root)
 349 {
 350         debugfs_create_file("cdns-registers", 0400, root, cdns, &cdns_reg_fops);
 351 }
 352 EXPORT_SYMBOL_GPL(sdw_cdns_debugfs_init);
 353
 354 #endif /* CONFIG_DEBUG_FS */
 355
 356 /*
 357  * IO Calls
 358  */
 359 static enum sdw_command_response
 360 cdns_fill_msg_resp(struct sdw_cdns *cdns,
 361                    struct sdw_msg *msg, int count, int offset)
 362 {
 363         int nack = 0, no_ack = 0;
 364         int i;
 365
 366         /* check message response */
 367         for (i = 0; i < count; i++) {
 368                 if (!(cdns->response_buf[i] & CDNS_MCP_RESP_ACK)) {
 369                         no_ack = 1;
 370                         dev_dbg_ratelimited(cdns->dev, "Msg Ack not received\n");
 371                 }
 372                 if (cdns->response_buf[i] & CDNS_MCP_RESP_NACK) {
 373                         nack = 1;
 374                         dev_err_ratelimited(cdns->dev, "Msg NACK received\n");
 375                 }
 376         }
 377
 378         if (nack) {
 379                 dev_err_ratelimited(cdns->dev, "Msg NACKed for Slave %d\n", msg->dev_num);
 380                 return SDW_CMD_FAIL;
 381         } else if (no_ack) {
 382                 dev_dbg_ratelimited(cdns->dev, "Msg ignored for Slave %d\n", msg->dev_num);
 383                 return SDW_CMD_IGNORED;
 384         }
 385
 386         /* fill response */
 387         for (i = 0; i < count; i++)
 388                 msg->buf[i + offset] = cdns->response_buf[i] >>
 389                                 SDW_REG_SHIFT(CDNS_MCP_RESP_RDATA);
 390
 391         return SDW_CMD_OK;
 392 }
 393
 394 static enum sdw_command_response
 395 _cdns_xfer_msg(struct sdw_cdns *cdns, struct sdw_msg *msg, int cmd,
 396                int offset, int count, bool defer)
 397 {
 398         unsigned long time;
 399         u32 base, i, data;
 400         u16 addr;
 401
 402         /* Program the watermark level for RX FIFO */
 403         if (cdns->msg_count != count) {
 404                 cdns_writel(cdns, CDNS_MCP_FIFOLEVEL, count);
 405                 cdns->msg_count = count;
 406         }
 407
 408         base = CDNS_MCP_CMD_BASE;
 409         addr = msg->addr;
 410
 411         for (i = 0; i < count; i++) {
 412                 data = msg->dev_num << SDW_REG_SHIFT(CDNS_MCP_CMD_DEV_ADDR);
 413                 data |= cmd << SDW_REG_SHIFT(CDNS_MCP_CMD_COMMAND);
 414                 data |= addr++  << SDW_REG_SHIFT(CDNS_MCP_CMD_REG_ADDR_L);
 415
 416                 if (msg->flags == SDW_MSG_FLAG_WRITE)
 417                         data |= msg->buf[i + offset];
 418
 419                 data |= msg->ssp_sync << SDW_REG_SHIFT(CDNS_MCP_CMD_SSP_TAG);
 420                 cdns_writel(cdns, base, data);
 421                 base += CDNS_MCP_CMD_WORD_LEN;
 422         }
 423
 424         if (defer)
 425                 return SDW_CMD_OK;
 426
 427         /* wait for timeout or response */
 428         time = wait_for_completion_timeout(&cdns->tx_complete,
 429                                            msecs_to_jiffies(CDNS_TX_TIMEOUT));
 430         if (!time) {
 431                 dev_err(cdns->dev, "IO transfer timed out\n");
 432                 msg->len = 0;
 433                 return SDW_CMD_TIMEOUT;
 434         }
 435
 436         return cdns_fill_msg_resp(cdns, msg, count, offset);
 437 }
 438
 439 static enum sdw_command_response
 440 cdns_program_scp_addr(struct sdw_cdns *cdns, struct sdw_msg *msg)
 441 {
 442         int nack = 0, no_ack = 0;
 443         unsigned long time;
 444         u32 data[2], base;
 445         int i;
 446
 447         /* Program the watermark level for RX FIFO */
 448         if (cdns->msg_count != CDNS_SCP_RX_FIFOLEVEL) {
 449                 cdns_writel(cdns, CDNS_MCP_FIFOLEVEL, CDNS_SCP_RX_FIFOLEVEL);
 450                 cdns->msg_count = CDNS_SCP_RX_FIFOLEVEL;
 451         }
 452
 453         data[0] = msg->dev_num << SDW_REG_SHIFT(CDNS_MCP_CMD_DEV_ADDR);
 454         data[0] |= 0x3 << SDW_REG_SHIFT(CDNS_MCP_CMD_COMMAND);
 455         data[1] = data[0];
 456
 457         data[0] |= SDW_SCP_ADDRPAGE1 << SDW_REG_SHIFT(CDNS_MCP_CMD_REG_ADDR_L);
 458         data[1] |= SDW_SCP_ADDRPAGE2 << SDW_REG_SHIFT(CDNS_MCP_CMD_REG_ADDR_L);
 459
 460         data[0] |= msg->addr_page1;
 461         data[1] |= msg->addr_page2;
 462
 463         base = CDNS_MCP_CMD_BASE;
 464         cdns_writel(cdns, base, data[0]);
 465         base += CDNS_MCP_CMD_WORD_LEN;
 466         cdns_writel(cdns, base, data[1]);
 467
 468         time = wait_for_completion_timeout(&cdns->tx_complete,
 469                                            msecs_to_jiffies(CDNS_TX_TIMEOUT));
 470         if (!time) {
 471                 dev_err(cdns->dev, "SCP Msg trf timed out\n");
 472                 msg->len = 0;
 473                 return SDW_CMD_TIMEOUT;
 474         }
 475
 476         /* check response the writes */
 477         for (i = 0; i < 2; i++) {
 478                 if (!(cdns->response_buf[i] & CDNS_MCP_RESP_ACK)) {
 479                         no_ack = 1;
 480                         dev_err(cdns->dev, "Program SCP Ack not received\n");
 481                         if (cdns->response_buf[i] & CDNS_MCP_RESP_NACK) {
 482                                 nack = 1;
 483                                 dev_err(cdns->dev, "Program SCP NACK received\n");
 484                         }
 485                 }
 486         }
 487
 488         /* For NACK, NO ack, don't return err if we are in Broadcast mode */
 489         if (nack) {
 490                 dev_err_ratelimited(cdns->dev,
 491                                     "SCP_addrpage NACKed for Slave %d\n", msg->dev_num);
 492                 return SDW_CMD_FAIL;
 493         } else if (no_ack) {
 494                 dev_dbg_ratelimited(cdns->dev,
 495                                     "SCP_addrpage ignored for Slave %d\n", msg->dev_num);
 496                 return SDW_CMD_IGNORED;
 497         }
 498
 499         return SDW_CMD_OK;
 500 }
 501
 502 static int cdns_prep_msg(struct sdw_cdns *cdns, struct sdw_msg *msg, int *cmd)
 503 {
 504         int ret;
 505
 506         if (msg->page) {
 507                 ret = cdns_program_scp_addr(cdns, msg);
 508                 if (ret) {
 509                         msg->len = 0;
 510                         return ret;
 511                 }
 512         }
 513
 514         switch (msg->flags) {
 515         case SDW_MSG_FLAG_READ:
 516                 *cmd = CDNS_MCP_CMD_READ;
 517                 break;
 518
 519         case SDW_MSG_FLAG_WRITE:
 520                 *cmd = CDNS_MCP_CMD_WRITE;
 521                 break;
 522
 523         default:
 524                 dev_err(cdns->dev, "Invalid msg cmd: %d\n", msg->flags);
 525                 return -EINVAL;
 526         }
 527
 528         return 0;
 529 }
 530
 531 enum sdw_command_response
 532 cdns_xfer_msg(struct sdw_bus *bus, struct sdw_msg *msg)
 533 {
 534         struct sdw_cdns *cdns = bus_to_cdns(bus);
 535         int cmd = 0, ret, i;
 536
 537         ret = cdns_prep_msg(cdns, msg, &cmd);
 538         if (ret)
 539                 return SDW_CMD_FAIL_OTHER;
 540
 541         for (i = 0; i < msg->len / CDNS_MCP_CMD_LEN; i++) {
 542                 ret = _cdns_xfer_msg(cdns, msg, cmd, i * CDNS_MCP_CMD_LEN,
 543                                      CDNS_MCP_CMD_LEN, false);
 544                 if (ret < 0)
 545                         goto exit;
 546         }
 547
 548         if (!(msg->len % CDNS_MCP_CMD_LEN))
 549                 goto exit;
 550
 551         ret = _cdns_xfer_msg(cdns, msg, cmd, i * CDNS_MCP_CMD_LEN,
 552                              msg->len % CDNS_MCP_CMD_LEN, false);
 553
 554 exit:
 555         return ret;
 556 }
 557 EXPORT_SYMBOL(cdns_xfer_msg);
 558
 559 enum sdw_command_response
 560 cdns_xfer_msg_defer(struct sdw_bus *bus,
 561                     struct sdw_msg *msg, struct sdw_defer *defer)
 562 {
 563         struct sdw_cdns *cdns = bus_to_cdns(bus);
 564         int cmd = 0, ret;
 565
 566         /* for defer only 1 message is supported */
 567         if (msg->len > 1)
 568                 return -ENOTSUPP;
 569
 570         ret = cdns_prep_msg(cdns, msg, &cmd);
 571         if (ret)
 572                 return SDW_CMD_FAIL_OTHER;
 573
 574         cdns->defer = defer;
 575         cdns->defer->length = msg->len;
 576
 577         return _cdns_xfer_msg(cdns, msg, cmd, 0, msg->len, true);
 578 }
 579 EXPORT_SYMBOL(cdns_xfer_msg_defer);
 580
 581 enum sdw_command_response
 582 cdns_reset_page_addr(struct sdw_bus *bus, unsigned int dev_num)
 583 {
 584         struct sdw_cdns *cdns = bus_to_cdns(bus);
 585         struct sdw_msg msg;
 586
 587         /* Create dummy message with valid device number */
 588         memset(&msg, 0, sizeof(msg));
 589         msg.dev_num = dev_num;
 590
 591         return cdns_program_scp_addr(cdns, &msg);
 592 }
 593 EXPORT_SYMBOL(cdns_reset_page_addr);
 594
 595 /*
 596  * IRQ handling
 597  */
 598
 599 static void cdns_read_response(struct sdw_cdns *cdns)
 600 {
 601         u32 num_resp, cmd_base;
 602         int i;
 603
 604         num_resp = cdns_readl(cdns, CDNS_MCP_FIFOSTAT);
 605         num_resp &= CDNS_MCP_RX_FIFO_AVAIL;
 606
 607         cmd_base = CDNS_MCP_CMD_BASE;
 608
 609         for (i = 0; i < num_resp; i++) {
 610                 cdns->response_buf[i] = cdns_readl(cdns, cmd_base);
 611                 cmd_base += CDNS_MCP_CMD_WORD_LEN;
 612         }
 613 }
 614
 615 static int cdns_update_slave_status(struct sdw_cdns *cdns,
 616                                     u32 slave0, u32 slave1)
 617 {
 618         enum sdw_slave_status status[SDW_MAX_DEVICES + 1];
 619         bool is_slave = false;
 620         u64 slave;
 621         u32 mask;
 622         int i, set_status;
 623
 624         /* combine the two status */
 625         slave = ((u64)slave1 << 32) | slave0;
 626         memset(status, 0, sizeof(status));
 627
 628         for (i = 0; i <= SDW_MAX_DEVICES; i++) {
 629                 mask = (slave >> (i * CDNS_MCP_SLAVE_STATUS_NUM)) &
 630                                 CDNS_MCP_SLAVE_STATUS_BITS;
 631                 if (!mask)
 632                         continue;
 633
 634                 is_slave = true;
 635                 set_status = 0;
 636
 637                 if (mask & CDNS_MCP_SLAVE_INTSTAT_RESERVED) {
 638                         status[i] = SDW_SLAVE_RESERVED;
 639                         set_status++;
 640                 }
 641
 642                 if (mask & CDNS_MCP_SLAVE_INTSTAT_ATTACHED) {
 643                         status[i] = SDW_SLAVE_ATTACHED;
 644                         set_status++;
 645                 }
 646
 647                 if (mask & CDNS_MCP_SLAVE_INTSTAT_ALERT) {
 648                         status[i] = SDW_SLAVE_ALERT;
 649                         set_status++;
 650                 }
 651
 652                 if (mask & CDNS_MCP_SLAVE_INTSTAT_NPRESENT) {
 653                         status[i] = SDW_SLAVE_UNATTACHED;
 654                         set_status++;
 655                 }
 656
 657                 /* first check if Slave reported multiple status */
 658                 if (set_status > 1) {
 659                         dev_warn_ratelimited(cdns->dev,
 660                                              "Slave reported multiple Status: %d\n",
 661                                              mask);
 662                         /*
 663                          * TODO: we need to reread the status here by
 664                          * issuing a PING cmd
 665                          */
 666                 }
 667         }
 668
 669         if (is_slave)
 670                 return sdw_handle_slave_status(&cdns->bus, status);
 671
 672         return 0;
 673 }
 674
 675 /**
 676  * sdw_cdns_irq() - Cadence interrupt handler
 677  * @irq: irq number
 678  * @dev_id: irq context
 679  */
 680 irqreturn_t sdw_cdns_irq(int irq, void *dev_id)
 681 {
 682         struct sdw_cdns *cdns = dev_id;
 683         u32 int_status;
 684         int ret = IRQ_HANDLED;
 685
 686         /* Check if the link is up */
 687         if (!cdns->link_up)
 688                 return IRQ_NONE;
 689
 690         int_status = cdns_readl(cdns, CDNS_MCP_INTSTAT);
 691
 692         if (!(int_status & CDNS_MCP_INT_IRQ))
 693                 return IRQ_NONE;
 694
 695         if (int_status & CDNS_MCP_INT_RX_WL) {
 696                 cdns_read_response(cdns);
 697
 698                 if (cdns->defer) {
 699                         cdns_fill_msg_resp(cdns, cdns->defer->msg,
 700                                            cdns->defer->length, 0);
 701                         complete(&cdns->defer->complete);
 702                         cdns->defer = NULL;
 703                 } else {
 704                         complete(&cdns->tx_complete);
 705                 }
 706         }
 707
 708         if (int_status & CDNS_MCP_INT_PARITY) {
 709                 /* Parity error detected by Master */
 710                 dev_err_ratelimited(cdns->dev, "Parity error\n");
 711         }
 712
 713         if (int_status & CDNS_MCP_INT_CTRL_CLASH) {
 714                 /* Slave is driving bit slot during control word */
 715                 dev_err_ratelimited(cdns->dev, "Bus clash for control word\n");
 716         }
 717
 718         if (int_status & CDNS_MCP_INT_DATA_CLASH) {
 719                 /*
 720                  * Multiple slaves trying to drive bit slot, or issue with
 721                  * ownership of data bits or Slave gone bonkers
 722                  */
 723                 dev_err_ratelimited(cdns->dev, "Bus clash for data word\n");
 724         }
 725
 726         if (int_status & CDNS_MCP_INT_SLAVE_MASK) {
 727                 /* Mask the Slave interrupt and wake thread */
 728                 cdns_updatel(cdns, CDNS_MCP_INTMASK,
 729                              CDNS_MCP_INT_SLAVE_MASK, 0);
 730
 731                 int_status &= ~CDNS_MCP_INT_SLAVE_MASK;
 732                 ret = IRQ_WAKE_THREAD;
 733         }
 734
 735         cdns_writel(cdns, CDNS_MCP_INTSTAT, int_status);
 736         return ret;
 737 }
 738 EXPORT_SYMBOL(sdw_cdns_irq);
 739
 740 /**
 741  * sdw_cdns_thread() - Cadence irq thread handler
 742  * @irq: irq number
 743  * @dev_id: irq context
 744  */
 745 irqreturn_t sdw_cdns_thread(int irq, void *dev_id)
 746 {
 747         struct sdw_cdns *cdns = dev_id;
 748         u32 slave0, slave1;
 749
 750         dev_dbg_ratelimited(cdns->dev, "Slave status change\n");
 751
 752         slave0 = cdns_readl(cdns, CDNS_MCP_SLAVE_INTSTAT0);
 753         slave1 = cdns_readl(cdns, CDNS_MCP_SLAVE_INTSTAT1);
 754
 755         cdns_update_slave_status(cdns, slave0, slave1);
 756         cdns_writel(cdns, CDNS_MCP_SLAVE_INTSTAT0, slave0);
 757         cdns_writel(cdns, CDNS_MCP_SLAVE_INTSTAT1, slave1);
 758
 759         /* clear and unmask Slave interrupt now */
 760         cdns_writel(cdns, CDNS_MCP_INTSTAT, CDNS_MCP_INT_SLAVE_MASK);
 761         cdns_updatel(cdns, CDNS_MCP_INTMASK,
 762                      CDNS_MCP_INT_SLAVE_MASK, CDNS_MCP_INT_SLAVE_MASK);
 763
 764         return IRQ_HANDLED;
 765 }
 766 EXPORT_SYMBOL(sdw_cdns_thread);
 767
 768 /*
 769  * init routines
 770  */
 771
 772 /**
 773  * sdw_cdns_exit_reset() - Program reset parameters and start bus operations
 774  * @cdns: Cadence instance
 775  */
 776 int sdw_cdns_exit_reset(struct sdw_cdns *cdns)
 777 {
 778         /* program maximum length reset to be safe */
 779         cdns_updatel(cdns, CDNS_MCP_CONTROL,
 780                      CDNS_MCP_CONTROL_RST_DELAY,
 781                      CDNS_MCP_CONTROL_RST_DELAY);
 782
 783         /* use hardware generated reset */
 784         cdns_updatel(cdns, CDNS_MCP_CONTROL,
 785                      CDNS_MCP_CONTROL_HW_RST,
 786                      CDNS_MCP_CONTROL_HW_RST);
 787
 788         /* enable bus operations with clock and data */
 789         cdns_updatel(cdns, CDNS_MCP_CONFIG,
 790                      CDNS_MCP_CONFIG_OP,
 791                      CDNS_MCP_CONFIG_OP_NORMAL);
 792
 793         /* commit changes */
 794         return cdns_update_config(cdns);
 795 }
 796 EXPORT_SYMBOL(sdw_cdns_exit_reset);
 797
 798 /**
 799  * sdw_cdns_enable_interrupt() - Enable SDW interrupts and update config
 800  * @cdns: Cadence instance
 801  */
 802 int sdw_cdns_enable_interrupt(struct sdw_cdns *cdns)
 803 {
 804         u32 mask;
 805
 806         cdns_writel(cdns, CDNS_MCP_SLAVE_INTMASK0,
 807                     CDNS_MCP_SLAVE_INTMASK0_MASK);
 808         cdns_writel(cdns, CDNS_MCP_SLAVE_INTMASK1,
 809                     CDNS_MCP_SLAVE_INTMASK1_MASK);
 810
 811         /* enable detection of all slave state changes */
 812         mask = CDNS_MCP_INT_SLAVE_MASK;
 813
 814         /* enable detection of bus issues */
 815         mask |= CDNS_MCP_INT_CTRL_CLASH | CDNS_MCP_INT_DATA_CLASH |
 816                 CDNS_MCP_INT_PARITY;
 817
 818         /* no detection of port interrupts for now */
 819
 820         /* enable detection of RX fifo level */
 821         mask |= CDNS_MCP_INT_RX_WL;
 822
 823         /*
 824          * CDNS_MCP_INT_IRQ needs to be set otherwise all previous
 825          * settings are irrelevant
 826          */
 827         mask |= CDNS_MCP_INT_IRQ;
 828
 829         if (interrupt_mask) /* parameter override */
 830                 mask = interrupt_mask;
 831
 832         cdns_writel(cdns, CDNS_MCP_INTMASK, mask);
 833
 834         /* commit changes */
 835         return cdns_update_config(cdns);
 836 }
 837 EXPORT_SYMBOL(sdw_cdns_enable_interrupt);
 838
 839 static int cdns_allocate_pdi(struct sdw_cdns *cdns,
 840                              struct sdw_cdns_pdi **stream,
 841                              u32 num, u32 pdi_offset)
 842 {
 843         struct sdw_cdns_pdi *pdi;
 844         int i;
 845
 846         if (!num)
 847                 return 0;
 848
 849         pdi = devm_kcalloc(cdns->dev, num, sizeof(*pdi), GFP_KERNEL);
 850         if (!pdi)
 851                 return -ENOMEM;
 852
 853         for (i = 0; i < num; i++) {
 854                 pdi[i].num = i + pdi_offset;
 855                 pdi[i].assigned = false;
 856         }
 857
 858         *stream = pdi;
 859         return 0;
 860 }
 861
 862 /**
 863  * sdw_cdns_pdi_init() - PDI initialization routine
 864  *
 865  * @cdns: Cadence instance
 866  * @config: Stream configurations
 867  */
 868 int sdw_cdns_pdi_init(struct sdw_cdns *cdns,
 869                       struct sdw_cdns_stream_config config)
 870 {
 871         struct sdw_cdns_streams *stream;
 872         int offset, i, ret;
 873
 874         cdns->pcm.num_bd = config.pcm_bd;
 875         cdns->pcm.num_in = config.pcm_in;
 876         cdns->pcm.num_out = config.pcm_out;
 877         cdns->pdm.num_bd = config.pdm_bd;
 878         cdns->pdm.num_in = config.pdm_in;
 879         cdns->pdm.num_out = config.pdm_out;
 880
 881         /* Allocate PDIs for PCMs */
 882         stream = &cdns->pcm;
 883
 884         /* First two PDIs are reserved for bulk transfers */
 885         if (stream->num_bd < CDNS_PCM_PDI_OFFSET)
 886                 return -EINVAL;
 887         stream->num_bd -= CDNS_PCM_PDI_OFFSET;
 888         offset = CDNS_PCM_PDI_OFFSET;
 889
 890         ret = cdns_allocate_pdi(cdns, &stream->bd,
 891                                 stream->num_bd, offset);
 892         if (ret)
 893                 return ret;
 894
 895         offset += stream->num_bd;
 896
 897         ret = cdns_allocate_pdi(cdns, &stream->in,
 898                                 stream->num_in, offset);
 899         if (ret)
 900                 return ret;
 901
 902         offset += stream->num_in;
 903
 904         ret = cdns_allocate_pdi(cdns, &stream->out,
 905                                 stream->num_out, offset);
 906         if (ret)
 907                 return ret;
 908
 909         /* Update total number of PCM PDIs */
 910         stream->num_pdi = stream->num_bd + stream->num_in + stream->num_out;
 911         cdns->num_ports = stream->num_pdi;
 912
 913         /* Allocate PDIs for PDMs */
 914         stream = &cdns->pdm;
 915         offset = CDNS_PDM_PDI_OFFSET;
 916         ret = cdns_allocate_pdi(cdns, &stream->bd,
 917                                 stream->num_bd, offset);
 918         if (ret)
 919                 return ret;
 920
 921         offset += stream->num_bd;
 922
 923         ret = cdns_allocate_pdi(cdns, &stream->in,
 924                                 stream->num_in, offset);
 925         if (ret)
 926                 return ret;
 927
 928         offset += stream->num_in;
 929
 930         ret = cdns_allocate_pdi(cdns, &stream->out,
 931                                 stream->num_out, offset);
 932         if (ret)
 933                 return ret;
 934
 935         /* Update total number of PDM PDIs */
 936         stream->num_pdi = stream->num_bd + stream->num_in + stream->num_out;
 937         cdns->num_ports += stream->num_pdi;
 938
 939         cdns->ports = devm_kcalloc(cdns->dev, cdns->num_ports,
 940                                    sizeof(*cdns->ports), GFP_KERNEL);
 941         if (!cdns->ports) {
 942                 ret = -ENOMEM;
 943                 return ret;
 944         }
 945
 946         for (i = 0; i < cdns->num_ports; i++) {
 947                 cdns->ports[i].assigned = false;
 948                 cdns->ports[i].num = i + 1; /* Port 0 reserved for bulk */
 949         }
 950
 951         return 0;
 952 }
 953 EXPORT_SYMBOL(sdw_cdns_pdi_init);
 954
 955 static u32 cdns_set_initial_frame_shape(int n_rows, int n_cols)
 956 {
 957         u32 val;
 958         int c;
 959         int r;
 960
 961         r = sdw_find_row_index(n_rows);
 962         c = sdw_find_col_index(n_cols) & CDNS_MCP_FRAME_SHAPE_COL_MASK;
 963
 964         val = (r << CDNS_MCP_FRAME_SHAPE_ROW_OFFSET) | c;
 965
 966         return val;
 967 }
 968
 969 /**
 970  * sdw_cdns_init() - Cadence initialization
 971  * @cdns: Cadence instance
 972  */
 973 int sdw_cdns_init(struct sdw_cdns *cdns)
 974 {
 975         struct sdw_bus *bus = &cdns->bus;
 976         struct sdw_master_prop *prop = &bus->prop;
 977         u32 val;
 978         int divider;
 979         int ret;
 980
 981         /* Exit clock stop */
 982         ret = cdns_clear_bit(cdns, CDNS_MCP_CONTROL,
 983                              CDNS_MCP_CONTROL_CLK_STOP_CLR);
 984         if (ret < 0) {
 985                 dev_err(cdns->dev, "Couldn't exit from clock stop\n");
 986                 return ret;
 987         }
 988
 989         /* Set clock divider */
 990         divider = (prop->mclk_freq / prop->max_clk_freq) - 1;
 991
 992         cdns_updatel(cdns, CDNS_MCP_CLK_CTRL0,
 993                      CDNS_MCP_CLK_MCLKD_MASK, divider);
 994         cdns_updatel(cdns, CDNS_MCP_CLK_CTRL1,
 995                      CDNS_MCP_CLK_MCLKD_MASK, divider);
 996
 997         /*
 998          * Frame shape changes after initialization have to be done
 999          * with the bank switch mechanism
1000          */
1001         val = cdns_set_initial_frame_shape(prop->default_row,
1002                                            prop->default_col);
1003         cdns_writel(cdns, CDNS_MCP_FRAME_SHAPE_INIT, val);
1004
1005         /* Set SSP interval to default value */
1006         cdns_writel(cdns, CDNS_MCP_SSP_CTRL0, CDNS_DEFAULT_SSP_INTERVAL);
1007         cdns_writel(cdns, CDNS_MCP_SSP_CTRL1, CDNS_DEFAULT_SSP_INTERVAL);
1008
1009         /* flush command FIFOs */
1010         cdns_updatel(cdns, CDNS_MCP_CONTROL, CDNS_MCP_CONTROL_CMD_RST,
1011                      CDNS_MCP_CONTROL_CMD_RST);
1012
1013         /* Set cmd accept mode */
1014         cdns_updatel(cdns, CDNS_MCP_CONTROL, CDNS_MCP_CONTROL_CMD_ACCEPT,
1015                      CDNS_MCP_CONTROL_CMD_ACCEPT);
1016
1017         /* Configure mcp config */
1018         val = cdns_readl(cdns, CDNS_MCP_CONFIG);
1019
1020         /* Set Max cmd retry to 15 */
1021         val |= CDNS_MCP_CONFIG_MCMD_RETRY;
1022
1023         /* Set frame delay between PREQ and ping frame to 15 frames */
1024         val |= 0xF << SDW_REG_SHIFT(CDNS_MCP_CONFIG_MPREQ_DELAY);
1025
1026         /* Disable auto bus release */
1027         val &= ~CDNS_MCP_CONFIG_BUS_REL;
1028
1029         /* Disable sniffer mode */
1030         val &= ~CDNS_MCP_CONFIG_SNIFFER;
1031
1032         /* Set cmd mode for Tx and Rx cmds */
1033         val &= ~CDNS_MCP_CONFIG_CMD;
1034
1035         cdns_writel(cdns, CDNS_MCP_CONFIG, val);
1036
1037         /* commit changes */
1038         return cdns_update_config(cdns);
1039 }
1040 EXPORT_SYMBOL(sdw_cdns_init);
1041
1042 int cdns_bus_conf(struct sdw_bus *bus, struct sdw_bus_params *params)
1043 {
1044         struct sdw_master_prop *prop = &bus->prop;
1045         struct sdw_cdns *cdns = bus_to_cdns(bus);
1046         int mcp_clkctrl_off;
1047         int divider;
1048
1049         if (!params->curr_dr_freq) {
1050                 dev_err(cdns->dev, "NULL curr_dr_freq\n");
1051                 return -EINVAL;
1052         }
1053
1054         divider = prop->mclk_freq * SDW_DOUBLE_RATE_FACTOR /
1055                 params->curr_dr_freq;
1056         divider--; /* divider is 1/(N+1) */
1057
1058         if (params->next_bank)
1059                 mcp_clkctrl_off = CDNS_MCP_CLK_CTRL1;
1060         else
1061                 mcp_clkctrl_off = CDNS_MCP_CLK_CTRL0;
1062
1063         cdns_updatel(cdns, mcp_clkctrl_off, CDNS_MCP_CLK_MCLKD_MASK, divider);
1064
1065         return 0;
1066 }
1067 EXPORT_SYMBOL(cdns_bus_conf);
1068
1069 static int cdns_port_params(struct sdw_bus *bus,
1070                             struct sdw_port_params *p_params, unsigned int bank)
1071 {
1072         struct sdw_cdns *cdns = bus_to_cdns(bus);
1073         int dpn_config = 0, dpn_config_off;
1074
1075         if (bank)
1076                 dpn_config_off = CDNS_DPN_B1_CONFIG(p_params->num);
1077         else
1078                 dpn_config_off = CDNS_DPN_B0_CONFIG(p_params->num);
1079
1080         dpn_config = cdns_readl(cdns, dpn_config_off);
1081
1082         dpn_config |= ((p_params->bps - 1) <<
1083                                 SDW_REG_SHIFT(CDNS_DPN_CONFIG_WL));
1084         dpn_config |= (p_params->flow_mode <<
1085                                 SDW_REG_SHIFT(CDNS_DPN_CONFIG_PORT_FLOW));
1086         dpn_config |= (p_params->data_mode <<
1087                                 SDW_REG_SHIFT(CDNS_DPN_CONFIG_PORT_DAT));
1088
1089         cdns_writel(cdns, dpn_config_off, dpn_config);
1090
1091         return 0;
1092 }
1093
1094 static int cdns_transport_params(struct sdw_bus *bus,
1095                                  struct sdw_transport_params *t_params,
1096                                  enum sdw_reg_bank bank)
1097 {
1098         struct sdw_cdns *cdns = bus_to_cdns(bus);
1099         int dpn_offsetctrl = 0, dpn_offsetctrl_off;
1100         int dpn_config = 0, dpn_config_off;
1101         int dpn_hctrl = 0, dpn_hctrl_off;
1102         int num = t_params->port_num;
1103         int dpn_samplectrl_off;
1104
1105         /*
1106          * Note: Only full data port is supported on the Master side for
1107          * both PCM and PDM ports.
1108          */
1109
1110         if (bank) {
1111                 dpn_config_off = CDNS_DPN_B1_CONFIG(num);
1112                 dpn_samplectrl_off = CDNS_DPN_B1_SAMPLE_CTRL(num);
1113                 dpn_hctrl_off = CDNS_DPN_B1_HCTRL(num);
1114                 dpn_offsetctrl_off = CDNS_DPN_B1_OFFSET_CTRL(num);
1115         } else {
1116                 dpn_config_off = CDNS_DPN_B0_CONFIG(num);
1117                 dpn_samplectrl_off = CDNS_DPN_B0_SAMPLE_CTRL(num);
1118                 dpn_hctrl_off = CDNS_DPN_B0_HCTRL(num);
1119                 dpn_offsetctrl_off = CDNS_DPN_B0_OFFSET_CTRL(num);
1120         }
1121
1122         dpn_config = cdns_readl(cdns, dpn_config_off);
1123
1124         dpn_config |= (t_params->blk_grp_ctrl <<
1125                                 SDW_REG_SHIFT(CDNS_DPN_CONFIG_BGC));
1126         dpn_config |= (t_params->blk_pkg_mode <<
1127                                 SDW_REG_SHIFT(CDNS_DPN_CONFIG_BPM));
1128         cdns_writel(cdns, dpn_config_off, dpn_config);
1129
1130         dpn_offsetctrl |= (t_params->offset1 <<
1131                                 SDW_REG_SHIFT(CDNS_DPN_OFFSET_CTRL_1));
1132         dpn_offsetctrl |= (t_params->offset2 <<
1133                                 SDW_REG_SHIFT(CDNS_DPN_OFFSET_CTRL_2));
1134         cdns_writel(cdns, dpn_offsetctrl_off,  dpn_offsetctrl);
1135
1136         dpn_hctrl |= (t_params->hstart <<
1137                                 SDW_REG_SHIFT(CDNS_DPN_HCTRL_HSTART));
1138         dpn_hctrl |= (t_params->hstop << SDW_REG_SHIFT(CDNS_DPN_HCTRL_HSTOP));
1139         dpn_hctrl |= (t_params->lane_ctrl <<
1140                                 SDW_REG_SHIFT(CDNS_DPN_HCTRL_LCTRL));
1141
1142         cdns_writel(cdns, dpn_hctrl_off, dpn_hctrl);
1143         cdns_writel(cdns, dpn_samplectrl_off, (t_params->sample_interval - 1));
1144
1145         return 0;
1146 }
1147
1148 static int cdns_port_enable(struct sdw_bus *bus,
1149                             struct sdw_enable_ch *enable_ch, unsigned int bank)
1150 {
1151         struct sdw_cdns *cdns = bus_to_cdns(bus);
1152         int dpn_chnen_off, ch_mask;
1153
1154         if (bank)
1155                 dpn_chnen_off = CDNS_DPN_B1_CH_EN(enable_ch->port_num);
1156         else
1157                 dpn_chnen_off = CDNS_DPN_B0_CH_EN(enable_ch->port_num);
1158
1159         ch_mask = enable_ch->ch_mask * enable_ch->enable;
1160         cdns_writel(cdns, dpn_chnen_off, ch_mask);
1161
1162         return 0;
1163 }
1164
1165 static const struct sdw_master_port_ops cdns_port_ops = {
1166         .dpn_set_port_params = cdns_port_params,
1167         .dpn_set_port_transport_params = cdns_transport_params,
1168         .dpn_port_enable_ch = cdns_port_enable,
1169 };
1170
1171 /**
1172  * sdw_cdns_probe() - Cadence probe routine
1173  * @cdns: Cadence instance
1174  */
1175 int sdw_cdns_probe(struct sdw_cdns *cdns)
1176 {
1177         init_completion(&cdns->tx_complete);
1178         cdns->bus.port_ops = &cdns_port_ops;
1179
1180         return 0;
1181 }
1182 EXPORT_SYMBOL(sdw_cdns_probe);
1183
1184 int cdns_set_sdw_stream(struct snd_soc_dai *dai,
1185                         void *stream, bool pcm, int direction)
1186 {
1187         struct sdw_cdns *cdns = snd_soc_dai_get_drvdata(dai);
1188         struct sdw_cdns_dma_data *dma;
1189
1190         dma = kzalloc(sizeof(*dma), GFP_KERNEL);
1191         if (!dma)
1192                 return -ENOMEM;
1193
1194         if (pcm)
1195                 dma->stream_type = SDW_STREAM_PCM;
1196         else
1197                 dma->stream_type = SDW_STREAM_PDM;
1198
1199         dma->bus = &cdns->bus;
1200         dma->link_id = cdns->instance;
1201
1202         dma->stream = stream;
1203
1204         if (direction == SNDRV_PCM_STREAM_PLAYBACK)
1205                 dai->playback_dma_data = dma;
1206         else
1207                 dai->capture_dma_data = dma;
1208
1209         return 0;
1210 }
1211 EXPORT_SYMBOL(cdns_set_sdw_stream);
1212
1213 /**
1214  * cdns_find_pdi() - Find a free PDI
1215  *
1216  * @cdns: Cadence instance
1217  * @num: Number of PDIs
1218  * @pdi: PDI instances
1219  *
1220  * Find and return a free PDI for a given PDI array
1221  */
1222 static struct sdw_cdns_pdi *cdns_find_pdi(struct sdw_cdns *cdns,
1223                                           unsigned int num,
1224                                           struct sdw_cdns_pdi *pdi)
1225 {
1226         int i;
1227
1228         for (i = 0; i < num; i++) {
1229                 if (pdi[i].assigned)
1230                         continue;
1231                 pdi[i].assigned = true;
1232                 return &pdi[i];
1233         }
1234
1235         return NULL;
1236 }
1237
1238 /**
1239  * sdw_cdns_config_stream: Configure a stream
1240  *
1241  * @cdns: Cadence instance
1242  * @port: Cadence data port
1243  * @ch: Channel count
1244  * @dir: Data direction
1245  * @pdi: PDI to be used
1246  */
1247 void sdw_cdns_config_stream(struct sdw_cdns *cdns,
1248                             struct sdw_cdns_port *port,
1249                             u32 ch, u32 dir, struct sdw_cdns_pdi *pdi)
1250 {
1251         u32 offset, val = 0;
1252
1253         if (dir == SDW_DATA_DIR_RX)
1254                 val = CDNS_PORTCTRL_DIRN;
1255
1256         offset = CDNS_PORTCTRL + port->num * CDNS_PORT_OFFSET;
1257         cdns_updatel(cdns, offset, CDNS_PORTCTRL_DIRN, val);
1258
1259         val = port->num;
1260         val |= ((1 << ch) - 1) << SDW_REG_SHIFT(CDNS_PDI_CONFIG_CHANNEL);
1261         cdns_writel(cdns, CDNS_PDI_CONFIG(pdi->num), val);
1262 }
1263 EXPORT_SYMBOL(sdw_cdns_config_stream);
1264
1265 /**
1266  * cdns_get_num_pdi() - Get number of PDIs required
1267  *
1268  * @cdns: Cadence instance
1269  * @pdi: PDI to be used
1270  * @num: Number of PDIs
1271  * @ch_count: Channel count
1272  */
1273 static int cdns_get_num_pdi(struct sdw_cdns *cdns,
1274                             struct sdw_cdns_pdi *pdi,
1275                             unsigned int num, u32 ch_count)
1276 {
1277         int i, pdis = 0;
1278
1279         for (i = 0; i < num; i++) {
1280                 if (pdi[i].assigned)
1281                         continue;
1282
1283                 if (pdi[i].ch_count < ch_count)
1284                         ch_count -= pdi[i].ch_count;
1285                 else
1286                         ch_count = 0;
1287
1288                 pdis++;
1289
1290                 if (!ch_count)
1291                         break;
1292         }
1293
1294         if (ch_count)
1295                 return 0;
1296
1297         return pdis;
1298 }
1299
1300 /**
1301  * sdw_cdns_get_stream() - Get stream information
1302  *
1303  * @cdns: Cadence instance
1304  * @stream: Stream to be allocated
1305  * @ch: Channel count
1306  * @dir: Data direction
1307  */
1308 int sdw_cdns_get_stream(struct sdw_cdns *cdns,
1309                         struct sdw_cdns_streams *stream,
1310                         u32 ch, u32 dir)
1311 {
1312         int pdis = 0;
1313
1314         if (dir == SDW_DATA_DIR_RX)
1315                 pdis = cdns_get_num_pdi(cdns, stream->in, stream->num_in, ch);
1316         else
1317                 pdis = cdns_get_num_pdi(cdns, stream->out, stream->num_out, ch);
1318
1319         /* check if we found PDI, else find in bi-directional */
1320         if (!pdis)
1321                 pdis = cdns_get_num_pdi(cdns, stream->bd, stream->num_bd, ch);
1322
1323         return pdis;
1324 }
1325 EXPORT_SYMBOL(sdw_cdns_get_stream);
1326
1327 /**
1328  * sdw_cdns_alloc_stream() - Allocate a stream
1329  *
1330  * @cdns: Cadence instance
1331  * @stream: Stream to be allocated
1332  * @port: Cadence data port
1333  * @ch: Channel count
1334  * @dir: Data direction
1335  */
1336 int sdw_cdns_alloc_stream(struct sdw_cdns *cdns,
1337                           struct sdw_cdns_streams *stream,
1338                           struct sdw_cdns_port *port, u32 ch, u32 dir)
1339 {
1340         struct sdw_cdns_pdi *pdi = NULL;
1341
1342         if (dir == SDW_DATA_DIR_RX)
1343                 pdi = cdns_find_pdi(cdns, stream->num_in, stream->in);
1344         else
1345                 pdi = cdns_find_pdi(cdns, stream->num_out, stream->out);
1346
1347         /* check if we found a PDI, else find in bi-directional */
1348         if (!pdi)
1349                 pdi = cdns_find_pdi(cdns, stream->num_bd, stream->bd);
1350
1351         if (!pdi)
1352                 return -EIO;
1353
1354         port->pdi = pdi;
1355         pdi->l_ch_num = 0;
1356         pdi->h_ch_num = ch - 1;
1357         pdi->dir = dir;
1358         pdi->ch_count = ch;
1359
1360         return 0;
1361 }
1362 EXPORT_SYMBOL(sdw_cdns_alloc_stream);
1363
1364 MODULE_LICENSE("Dual BSD/GPL");
1365 MODULE_DESCRIPTION("Cadence Soundwire Library");