1 // SPDX-License-Identifier: (GPL-2.0 OR BSD-3-Clause) 2 // Copyright(c) 2015-17 Intel Corporation. 3 4 /* 5 * Cadence SoundWire Master module 6 * Used by Master driver 7 */ 8 9 #include <linux/delay.h> 10 #include <linux/device.h> 11 #include <linux/debugfs.h> 12 #include <linux/interrupt.h> 13 #include <linux/io.h> 14 #include <linux/module.h> 15 #include <linux/mod_devicetable.h> 16 #include <linux/soundwire/sdw_registers.h> 17 #include <linux/soundwire/sdw.h> 18 #include <sound/pcm_params.h> 19 #include <sound/soc.h> 20 #include "bus.h" 21 #include "cadence_master.h" 22 23 static int interrupt_mask; 24 module_param_named(cnds_mcp_int_mask, interrupt_mask, int, 0444); 25 MODULE_PARM_DESC(cdns_mcp_int_mask, "Cadence MCP IntMask"); 26 27 #define CDNS_MCP_CONFIG 0x0 28 29 #define CDNS_MCP_CONFIG_MCMD_RETRY GENMASK(27, 24) 30 #define CDNS_MCP_CONFIG_MPREQ_DELAY GENMASK(20, 16) 31 #define CDNS_MCP_CONFIG_MMASTER BIT(7) 32 #define CDNS_MCP_CONFIG_BUS_REL BIT(6) 33 #define CDNS_MCP_CONFIG_SNIFFER BIT(5) 34 #define CDNS_MCP_CONFIG_SSPMOD BIT(4) 35 #define CDNS_MCP_CONFIG_CMD BIT(3) 36 #define CDNS_MCP_CONFIG_OP GENMASK(2, 0) 37 #define CDNS_MCP_CONFIG_OP_NORMAL 0 38 39 #define CDNS_MCP_CONTROL 0x4 40 41 #define CDNS_MCP_CONTROL_RST_DELAY GENMASK(10, 8) 42 #define CDNS_MCP_CONTROL_CMD_RST BIT(7) 43 #define CDNS_MCP_CONTROL_SOFT_RST BIT(6) 44 #define CDNS_MCP_CONTROL_SW_RST BIT(5) 45 #define CDNS_MCP_CONTROL_HW_RST BIT(4) 46 #define CDNS_MCP_CONTROL_CLK_PAUSE BIT(3) 47 #define CDNS_MCP_CONTROL_CLK_STOP_CLR BIT(2) 48 #define CDNS_MCP_CONTROL_CMD_ACCEPT BIT(1) 49 #define CDNS_MCP_CONTROL_BLOCK_WAKEUP BIT(0) 50 51 #define CDNS_MCP_CMDCTRL 0x8 52 #define CDNS_MCP_SSPSTAT 0xC 53 #define CDNS_MCP_FRAME_SHAPE 0x10 54 #define CDNS_MCP_FRAME_SHAPE_INIT 0x14 55 #define CDNS_MCP_FRAME_SHAPE_COL_MASK GENMASK(2, 0) 56 #define CDNS_MCP_FRAME_SHAPE_ROW_OFFSET 3 57 58 #define CDNS_MCP_CONFIG_UPDATE 0x18 59 #define CDNS_MCP_CONFIG_UPDATE_BIT BIT(0) 60 61 #define CDNS_MCP_PHYCTRL 0x1C 62 #define CDNS_MCP_SSP_CTRL0 0x20 63 #define CDNS_MCP_SSP_CTRL1 0x28 64 #define CDNS_MCP_CLK_CTRL0 0x30 65 #define CDNS_MCP_CLK_CTRL1 0x38 66 #define CDNS_MCP_CLK_MCLKD_MASK GENMASK(7, 0) 67 68 #define CDNS_MCP_STAT 0x40 69 70 #define CDNS_MCP_STAT_ACTIVE_BANK BIT(20) 71 #define CDNS_MCP_STAT_CLK_STOP BIT(16) 72 73 #define CDNS_MCP_INTSTAT 0x44 74 #define CDNS_MCP_INTMASK 0x48 75 76 #define CDNS_MCP_INT_IRQ BIT(31) 77 #define CDNS_MCP_INT_RESERVED1 GENMASK(30, 17) 78 #define CDNS_MCP_INT_WAKEUP BIT(16) 79 #define CDNS_MCP_INT_SLAVE_RSVD BIT(15) 80 #define CDNS_MCP_INT_SLAVE_ALERT BIT(14) 81 #define CDNS_MCP_INT_SLAVE_ATTACH BIT(13) 82 #define CDNS_MCP_INT_SLAVE_NATTACH BIT(12) 83 #define CDNS_MCP_INT_SLAVE_MASK GENMASK(15, 12) 84 #define CDNS_MCP_INT_DPINT BIT(11) 85 #define CDNS_MCP_INT_CTRL_CLASH BIT(10) 86 #define CDNS_MCP_INT_DATA_CLASH BIT(9) 87 #define CDNS_MCP_INT_PARITY BIT(8) 88 #define CDNS_MCP_INT_CMD_ERR BIT(7) 89 #define CDNS_MCP_INT_RESERVED2 GENMASK(6, 4) 90 #define CDNS_MCP_INT_RX_NE BIT(3) 91 #define CDNS_MCP_INT_RX_WL BIT(2) 92 #define CDNS_MCP_INT_TXE BIT(1) 93 #define CDNS_MCP_INT_TXF BIT(0) 94 #define CDNS_MCP_INT_RESERVED (CDNS_MCP_INT_RESERVED1 | CDNS_MCP_INT_RESERVED2) 95 96 #define CDNS_MCP_INTSET 0x4C 97 98 #define CDNS_MCP_SLAVE_STAT 0x50 99 #define CDNS_MCP_SLAVE_STAT_MASK GENMASK(1, 0) 100 101 #define CDNS_MCP_SLAVE_INTSTAT0 0x54 102 #define CDNS_MCP_SLAVE_INTSTAT1 0x58 103 #define CDNS_MCP_SLAVE_INTSTAT_NPRESENT BIT(0) 104 #define CDNS_MCP_SLAVE_INTSTAT_ATTACHED BIT(1) 105 #define CDNS_MCP_SLAVE_INTSTAT_ALERT BIT(2) 106 #define CDNS_MCP_SLAVE_INTSTAT_RESERVED BIT(3) 107 #define CDNS_MCP_SLAVE_STATUS_BITS GENMASK(3, 0) 108 #define CDNS_MCP_SLAVE_STATUS_NUM 4 109 110 #define CDNS_MCP_SLAVE_INTMASK0 0x5C 111 #define CDNS_MCP_SLAVE_INTMASK1 0x60 112 113 #define CDNS_MCP_SLAVE_INTMASK0_MASK GENMASK(31, 0) 114 #define CDNS_MCP_SLAVE_INTMASK1_MASK GENMASK(15, 0) 115 116 #define CDNS_MCP_PORT_INTSTAT 0x64 117 #define CDNS_MCP_PDI_STAT 0x6C 118 119 #define CDNS_MCP_FIFOLEVEL 0x78 120 #define CDNS_MCP_FIFOSTAT 0x7C 121 #define CDNS_MCP_RX_FIFO_AVAIL GENMASK(5, 0) 122 123 #define CDNS_MCP_CMD_BASE 0x80 124 #define CDNS_MCP_RESP_BASE 0x80 125 #define CDNS_MCP_CMD_LEN 0x20 126 #define CDNS_MCP_CMD_WORD_LEN 0x4 127 128 #define CDNS_MCP_CMD_SSP_TAG BIT(31) 129 #define CDNS_MCP_CMD_COMMAND GENMASK(30, 28) 130 #define CDNS_MCP_CMD_DEV_ADDR GENMASK(27, 24) 131 #define CDNS_MCP_CMD_REG_ADDR_H GENMASK(23, 16) 132 #define CDNS_MCP_CMD_REG_ADDR_L GENMASK(15, 8) 133 #define CDNS_MCP_CMD_REG_DATA GENMASK(7, 0) 134 135 #define CDNS_MCP_CMD_READ 2 136 #define CDNS_MCP_CMD_WRITE 3 137 138 #define CDNS_MCP_RESP_RDATA GENMASK(15, 8) 139 #define CDNS_MCP_RESP_ACK BIT(0) 140 #define CDNS_MCP_RESP_NACK BIT(1) 141 142 #define CDNS_DP_SIZE 128 143 144 #define CDNS_DPN_B0_CONFIG(n) (0x100 + CDNS_DP_SIZE * (n)) 145 #define CDNS_DPN_B0_CH_EN(n) (0x104 + CDNS_DP_SIZE * (n)) 146 #define CDNS_DPN_B0_SAMPLE_CTRL(n) (0x108 + CDNS_DP_SIZE * (n)) 147 #define CDNS_DPN_B0_OFFSET_CTRL(n) (0x10C + CDNS_DP_SIZE * (n)) 148 #define CDNS_DPN_B0_HCTRL(n) (0x110 + CDNS_DP_SIZE * (n)) 149 #define CDNS_DPN_B0_ASYNC_CTRL(n) (0x114 + CDNS_DP_SIZE * (n)) 150 151 #define CDNS_DPN_B1_CONFIG(n) (0x118 + CDNS_DP_SIZE * (n)) 152 #define CDNS_DPN_B1_CH_EN(n) (0x11C + CDNS_DP_SIZE * (n)) 153 #define CDNS_DPN_B1_SAMPLE_CTRL(n) (0x120 + CDNS_DP_SIZE * (n)) 154 #define CDNS_DPN_B1_OFFSET_CTRL(n) (0x124 + CDNS_DP_SIZE * (n)) 155 #define CDNS_DPN_B1_HCTRL(n) (0x128 + CDNS_DP_SIZE * (n)) 156 #define CDNS_DPN_B1_ASYNC_CTRL(n) (0x12C + CDNS_DP_SIZE * (n)) 157 158 #define CDNS_DPN_CONFIG_BPM BIT(18) 159 #define CDNS_DPN_CONFIG_BGC GENMASK(17, 16) 160 #define CDNS_DPN_CONFIG_WL GENMASK(12, 8) 161 #define CDNS_DPN_CONFIG_PORT_DAT GENMASK(3, 2) 162 #define CDNS_DPN_CONFIG_PORT_FLOW GENMASK(1, 0) 163 164 #define CDNS_DPN_SAMPLE_CTRL_SI GENMASK(15, 0) 165 166 #define CDNS_DPN_OFFSET_CTRL_1 GENMASK(7, 0) 167 #define CDNS_DPN_OFFSET_CTRL_2 GENMASK(15, 8) 168 169 #define CDNS_DPN_HCTRL_HSTOP GENMASK(3, 0) 170 #define CDNS_DPN_HCTRL_HSTART GENMASK(7, 4) 171 #define CDNS_DPN_HCTRL_LCTRL GENMASK(10, 8) 172 173 #define CDNS_PORTCTRL 0x130 174 #define CDNS_PORTCTRL_DIRN BIT(7) 175 #define CDNS_PORTCTRL_BANK_INVERT BIT(8) 176 177 #define CDNS_PORT_OFFSET 0x80 178 179 #define CDNS_PDI_CONFIG(n) (0x1100 + (n) * 16) 180 181 #define CDNS_PDI_CONFIG_SOFT_RESET BIT(24) 182 #define CDNS_PDI_CONFIG_CHANNEL GENMASK(15, 8) 183 #define CDNS_PDI_CONFIG_PORT GENMASK(4, 0) 184 185 /* Driver defaults */ 186 #define CDNS_TX_TIMEOUT 2000 187 188 #define CDNS_SCP_RX_FIFOLEVEL 0x2 189 190 /* 191 * register accessor helpers 192 */ 193 static inline u32 cdns_readl(struct sdw_cdns *cdns, int offset) 194 { 195 return readl(cdns->registers + offset); 196 } 197 198 static inline void cdns_writel(struct sdw_cdns *cdns, int offset, u32 value) 199 { 200 writel(value, cdns->registers + offset); 201 } 202 203 static inline void cdns_updatel(struct sdw_cdns *cdns, 204 int offset, u32 mask, u32 val) 205 { 206 u32 tmp; 207 208 tmp = cdns_readl(cdns, offset); 209 tmp = (tmp & ~mask) | val; 210 cdns_writel(cdns, offset, tmp); 211 } 212 213 static int cdns_set_wait(struct sdw_cdns *cdns, int offset, u32 mask, u32 value) 214 { 215 int timeout = 10; 216 u32 reg_read; 217 218 /* Wait for bit to be set */ 219 do { 220 reg_read = readl(cdns->registers + offset); 221 if ((reg_read & mask) == value) 222 return 0; 223 224 timeout--; 225 usleep_range(50, 100); 226 } while (timeout != 0); 227 228 return -ETIMEDOUT; 229 } 230 231 static int cdns_clear_bit(struct sdw_cdns *cdns, int offset, u32 value) 232 { 233 writel(value, cdns->registers + offset); 234 235 /* Wait for bit to be self cleared */ 236 return cdns_set_wait(cdns, offset, value, 0); 237 } 238 239 /* 240 * all changes to the MCP_CONFIG, MCP_CONTROL, MCP_CMDCTRL and MCP_PHYCTRL 241 * need to be confirmed with a write to MCP_CONFIG_UPDATE 242 */ 243 static int cdns_config_update(struct sdw_cdns *cdns) 244 { 245 int ret; 246 247 if (sdw_cdns_is_clock_stop(cdns)) { 248 dev_err(cdns->dev, "Cannot program MCP_CONFIG_UPDATE in ClockStopMode\n"); 249 return -EINVAL; 250 } 251 252 ret = cdns_clear_bit(cdns, CDNS_MCP_CONFIG_UPDATE, 253 CDNS_MCP_CONFIG_UPDATE_BIT); 254 if (ret < 0) 255 dev_err(cdns->dev, "Config update timedout\n"); 256 257 return ret; 258 } 259 260 /* 261 * debugfs 262 */ 263 #ifdef CONFIG_DEBUG_FS 264 265 #define RD_BUF (2 * PAGE_SIZE) 266 267 static ssize_t cdns_sprintf(struct sdw_cdns *cdns, 268 char *buf, size_t pos, unsigned int reg) 269 { 270 return scnprintf(buf + pos, RD_BUF - pos, 271 "%4x\t%8x\n", reg, cdns_readl(cdns, reg)); 272 } 273 274 static int cdns_reg_show(struct seq_file *s, void *data) 275 { 276 struct sdw_cdns *cdns = s->private; 277 char *buf; 278 ssize_t ret; 279 int num_ports; 280 int i, j; 281 282 buf = kzalloc(RD_BUF, GFP_KERNEL); 283 if (!buf) 284 return -ENOMEM; 285 286 ret = scnprintf(buf, RD_BUF, "Register Value\n"); 287 ret += scnprintf(buf + ret, RD_BUF - ret, "\nMCP Registers\n"); 288 /* 8 MCP registers */ 289 for (i = CDNS_MCP_CONFIG; i <= CDNS_MCP_PHYCTRL; i += sizeof(u32)) 290 ret += cdns_sprintf(cdns, buf, ret, i); 291 292 ret += scnprintf(buf + ret, RD_BUF - ret, 293 "\nStatus & Intr Registers\n"); 294 /* 13 Status & Intr registers (offsets 0x70 and 0x74 not defined) */ 295 for (i = CDNS_MCP_STAT; i <= CDNS_MCP_FIFOSTAT; i += sizeof(u32)) 296 ret += cdns_sprintf(cdns, buf, ret, i); 297 298 ret += scnprintf(buf + ret, RD_BUF - ret, 299 "\nSSP & Clk ctrl Registers\n"); 300 ret += cdns_sprintf(cdns, buf, ret, CDNS_MCP_SSP_CTRL0); 301 ret += cdns_sprintf(cdns, buf, ret, CDNS_MCP_SSP_CTRL1); 302 ret += cdns_sprintf(cdns, buf, ret, CDNS_MCP_CLK_CTRL0); 303 ret += cdns_sprintf(cdns, buf, ret, CDNS_MCP_CLK_CTRL1); 304 305 ret += scnprintf(buf + ret, RD_BUF - ret, 306 "\nDPn B0 Registers\n"); 307 308 num_ports = cdns->num_ports; 309 310 for (i = 0; i < num_ports; i++) { 311 ret += scnprintf(buf + ret, RD_BUF - ret, 312 "\nDP-%d\n", i); 313 for (j = CDNS_DPN_B0_CONFIG(i); 314 j < CDNS_DPN_B0_ASYNC_CTRL(i); j += sizeof(u32)) 315 ret += cdns_sprintf(cdns, buf, ret, j); 316 } 317 318 ret += scnprintf(buf + ret, RD_BUF - ret, 319 "\nDPn B1 Registers\n"); 320 for (i = 0; i < num_ports; i++) { 321 ret += scnprintf(buf + ret, RD_BUF - ret, 322 "\nDP-%d\n", i); 323 324 for (j = CDNS_DPN_B1_CONFIG(i); 325 j < CDNS_DPN_B1_ASYNC_CTRL(i); j += sizeof(u32)) 326 ret += cdns_sprintf(cdns, buf, ret, j); 327 } 328 329 ret += scnprintf(buf + ret, RD_BUF - ret, 330 "\nDPn Control Registers\n"); 331 for (i = 0; i < num_ports; i++) 332 ret += cdns_sprintf(cdns, buf, ret, 333 CDNS_PORTCTRL + i * CDNS_PORT_OFFSET); 334 335 ret += scnprintf(buf + ret, RD_BUF - ret, 336 "\nPDIn Config Registers\n"); 337 338 /* number of PDI and ports is interchangeable */ 339 for (i = 0; i < num_ports; i++) 340 ret += cdns_sprintf(cdns, buf, ret, CDNS_PDI_CONFIG(i)); 341 342 seq_printf(s, "%s", buf); 343 kfree(buf); 344 345 return 0; 346 } 347 DEFINE_SHOW_ATTRIBUTE(cdns_reg); 348 349 static int cdns_hw_reset(void *data, u64 value) 350 { 351 struct sdw_cdns *cdns = data; 352 int ret; 353 354 if (value != 1) 355 return -EINVAL; 356 357 /* Userspace changed the hardware state behind the kernel's back */ 358 add_taint(TAINT_USER, LOCKDEP_STILL_OK); 359 360 ret = sdw_cdns_exit_reset(cdns); 361 362 dev_dbg(cdns->dev, "link hw_reset done: %d\n", ret); 363 364 return ret; 365 } 366 367 DEFINE_DEBUGFS_ATTRIBUTE(cdns_hw_reset_fops, NULL, cdns_hw_reset, "%llu\n"); 368 369 /** 370 * sdw_cdns_debugfs_init() - Cadence debugfs init 371 * @cdns: Cadence instance 372 * @root: debugfs root 373 */ 374 void sdw_cdns_debugfs_init(struct sdw_cdns *cdns, struct dentry *root) 375 { 376 debugfs_create_file("cdns-registers", 0400, root, cdns, &cdns_reg_fops); 377 378 debugfs_create_file("cdns-hw-reset", 0200, root, cdns, 379 &cdns_hw_reset_fops); 380 } 381 EXPORT_SYMBOL_GPL(sdw_cdns_debugfs_init); 382 383 #endif /* CONFIG_DEBUG_FS */ 384 385 /* 386 * IO Calls 387 */ 388 static enum sdw_command_response 389 cdns_fill_msg_resp(struct sdw_cdns *cdns, 390 struct sdw_msg *msg, int count, int offset) 391 { 392 int nack = 0, no_ack = 0; 393 int i; 394 395 /* check message response */ 396 for (i = 0; i < count; i++) { 397 if (!(cdns->response_buf[i] & CDNS_MCP_RESP_ACK)) { 398 no_ack = 1; 399 dev_dbg_ratelimited(cdns->dev, "Msg Ack not received\n"); 400 if (cdns->response_buf[i] & CDNS_MCP_RESP_NACK) { 401 nack = 1; 402 dev_err_ratelimited(cdns->dev, "Msg NACK received\n"); 403 } 404 } 405 } 406 407 if (nack) { 408 dev_err_ratelimited(cdns->dev, "Msg NACKed for Slave %d\n", msg->dev_num); 409 return SDW_CMD_FAIL; 410 } 411 412 if (no_ack) { 413 dev_dbg_ratelimited(cdns->dev, "Msg ignored for Slave %d\n", msg->dev_num); 414 return SDW_CMD_IGNORED; 415 } 416 417 /* fill response */ 418 for (i = 0; i < count; i++) 419 msg->buf[i + offset] = cdns->response_buf[i] >> 420 SDW_REG_SHIFT(CDNS_MCP_RESP_RDATA); 421 422 return SDW_CMD_OK; 423 } 424 425 static enum sdw_command_response 426 _cdns_xfer_msg(struct sdw_cdns *cdns, struct sdw_msg *msg, int cmd, 427 int offset, int count, bool defer) 428 { 429 unsigned long time; 430 u32 base, i, data; 431 u16 addr; 432 433 /* Program the watermark level for RX FIFO */ 434 if (cdns->msg_count != count) { 435 cdns_writel(cdns, CDNS_MCP_FIFOLEVEL, count); 436 cdns->msg_count = count; 437 } 438 439 base = CDNS_MCP_CMD_BASE; 440 addr = msg->addr; 441 442 for (i = 0; i < count; i++) { 443 data = msg->dev_num << SDW_REG_SHIFT(CDNS_MCP_CMD_DEV_ADDR); 444 data |= cmd << SDW_REG_SHIFT(CDNS_MCP_CMD_COMMAND); 445 data |= addr++ << SDW_REG_SHIFT(CDNS_MCP_CMD_REG_ADDR_L); 446 447 if (msg->flags == SDW_MSG_FLAG_WRITE) 448 data |= msg->buf[i + offset]; 449 450 data |= msg->ssp_sync << SDW_REG_SHIFT(CDNS_MCP_CMD_SSP_TAG); 451 cdns_writel(cdns, base, data); 452 base += CDNS_MCP_CMD_WORD_LEN; 453 } 454 455 if (defer) 456 return SDW_CMD_OK; 457 458 /* wait for timeout or response */ 459 time = wait_for_completion_timeout(&cdns->tx_complete, 460 msecs_to_jiffies(CDNS_TX_TIMEOUT)); 461 if (!time) { 462 dev_err(cdns->dev, "IO transfer timed out, cmd %d device %d addr %x len %d\n", 463 cmd, msg->dev_num, msg->addr, msg->len); 464 msg->len = 0; 465 return SDW_CMD_TIMEOUT; 466 } 467 468 return cdns_fill_msg_resp(cdns, msg, count, offset); 469 } 470 471 static enum sdw_command_response 472 cdns_program_scp_addr(struct sdw_cdns *cdns, struct sdw_msg *msg) 473 { 474 int nack = 0, no_ack = 0; 475 unsigned long time; 476 u32 data[2], base; 477 int i; 478 479 /* Program the watermark level for RX FIFO */ 480 if (cdns->msg_count != CDNS_SCP_RX_FIFOLEVEL) { 481 cdns_writel(cdns, CDNS_MCP_FIFOLEVEL, CDNS_SCP_RX_FIFOLEVEL); 482 cdns->msg_count = CDNS_SCP_RX_FIFOLEVEL; 483 } 484 485 data[0] = msg->dev_num << SDW_REG_SHIFT(CDNS_MCP_CMD_DEV_ADDR); 486 data[0] |= 0x3 << SDW_REG_SHIFT(CDNS_MCP_CMD_COMMAND); 487 data[1] = data[0]; 488 489 data[0] |= SDW_SCP_ADDRPAGE1 << SDW_REG_SHIFT(CDNS_MCP_CMD_REG_ADDR_L); 490 data[1] |= SDW_SCP_ADDRPAGE2 << SDW_REG_SHIFT(CDNS_MCP_CMD_REG_ADDR_L); 491 492 data[0] |= msg->addr_page1; 493 data[1] |= msg->addr_page2; 494 495 base = CDNS_MCP_CMD_BASE; 496 cdns_writel(cdns, base, data[0]); 497 base += CDNS_MCP_CMD_WORD_LEN; 498 cdns_writel(cdns, base, data[1]); 499 500 time = wait_for_completion_timeout(&cdns->tx_complete, 501 msecs_to_jiffies(CDNS_TX_TIMEOUT)); 502 if (!time) { 503 dev_err(cdns->dev, "SCP Msg trf timed out\n"); 504 msg->len = 0; 505 return SDW_CMD_TIMEOUT; 506 } 507 508 /* check response the writes */ 509 for (i = 0; i < 2; i++) { 510 if (!(cdns->response_buf[i] & CDNS_MCP_RESP_ACK)) { 511 no_ack = 1; 512 dev_err(cdns->dev, "Program SCP Ack not received\n"); 513 if (cdns->response_buf[i] & CDNS_MCP_RESP_NACK) { 514 nack = 1; 515 dev_err(cdns->dev, "Program SCP NACK received\n"); 516 } 517 } 518 } 519 520 /* For NACK, NO ack, don't return err if we are in Broadcast mode */ 521 if (nack) { 522 dev_err_ratelimited(cdns->dev, 523 "SCP_addrpage NACKed for Slave %d\n", msg->dev_num); 524 return SDW_CMD_FAIL; 525 } 526 527 if (no_ack) { 528 dev_dbg_ratelimited(cdns->dev, 529 "SCP_addrpage ignored for Slave %d\n", msg->dev_num); 530 return SDW_CMD_IGNORED; 531 } 532 533 return SDW_CMD_OK; 534 } 535 536 static int cdns_prep_msg(struct sdw_cdns *cdns, struct sdw_msg *msg, int *cmd) 537 { 538 int ret; 539 540 if (msg->page) { 541 ret = cdns_program_scp_addr(cdns, msg); 542 if (ret) { 543 msg->len = 0; 544 return ret; 545 } 546 } 547 548 switch (msg->flags) { 549 case SDW_MSG_FLAG_READ: 550 *cmd = CDNS_MCP_CMD_READ; 551 break; 552 553 case SDW_MSG_FLAG_WRITE: 554 *cmd = CDNS_MCP_CMD_WRITE; 555 break; 556 557 default: 558 dev_err(cdns->dev, "Invalid msg cmd: %d\n", msg->flags); 559 return -EINVAL; 560 } 561 562 return 0; 563 } 564 565 enum sdw_command_response 566 cdns_xfer_msg(struct sdw_bus *bus, struct sdw_msg *msg) 567 { 568 struct sdw_cdns *cdns = bus_to_cdns(bus); 569 int cmd = 0, ret, i; 570 571 ret = cdns_prep_msg(cdns, msg, &cmd); 572 if (ret) 573 return SDW_CMD_FAIL_OTHER; 574 575 for (i = 0; i < msg->len / CDNS_MCP_CMD_LEN; i++) { 576 ret = _cdns_xfer_msg(cdns, msg, cmd, i * CDNS_MCP_CMD_LEN, 577 CDNS_MCP_CMD_LEN, false); 578 if (ret < 0) 579 goto exit; 580 } 581 582 if (!(msg->len % CDNS_MCP_CMD_LEN)) 583 goto exit; 584 585 ret = _cdns_xfer_msg(cdns, msg, cmd, i * CDNS_MCP_CMD_LEN, 586 msg->len % CDNS_MCP_CMD_LEN, false); 587 588 exit: 589 return ret; 590 } 591 EXPORT_SYMBOL(cdns_xfer_msg); 592 593 enum sdw_command_response 594 cdns_xfer_msg_defer(struct sdw_bus *bus, 595 struct sdw_msg *msg, struct sdw_defer *defer) 596 { 597 struct sdw_cdns *cdns = bus_to_cdns(bus); 598 int cmd = 0, ret; 599 600 /* for defer only 1 message is supported */ 601 if (msg->len > 1) 602 return -ENOTSUPP; 603 604 ret = cdns_prep_msg(cdns, msg, &cmd); 605 if (ret) 606 return SDW_CMD_FAIL_OTHER; 607 608 cdns->defer = defer; 609 cdns->defer->length = msg->len; 610 611 return _cdns_xfer_msg(cdns, msg, cmd, 0, msg->len, true); 612 } 613 EXPORT_SYMBOL(cdns_xfer_msg_defer); 614 615 enum sdw_command_response 616 cdns_reset_page_addr(struct sdw_bus *bus, unsigned int dev_num) 617 { 618 struct sdw_cdns *cdns = bus_to_cdns(bus); 619 struct sdw_msg msg; 620 621 /* Create dummy message with valid device number */ 622 memset(&msg, 0, sizeof(msg)); 623 msg.dev_num = dev_num; 624 625 return cdns_program_scp_addr(cdns, &msg); 626 } 627 EXPORT_SYMBOL(cdns_reset_page_addr); 628 629 /* 630 * IRQ handling 631 */ 632 633 static void cdns_read_response(struct sdw_cdns *cdns) 634 { 635 u32 num_resp, cmd_base; 636 int i; 637 638 num_resp = cdns_readl(cdns, CDNS_MCP_FIFOSTAT); 639 num_resp &= CDNS_MCP_RX_FIFO_AVAIL; 640 641 cmd_base = CDNS_MCP_CMD_BASE; 642 643 for (i = 0; i < num_resp; i++) { 644 cdns->response_buf[i] = cdns_readl(cdns, cmd_base); 645 cmd_base += CDNS_MCP_CMD_WORD_LEN; 646 } 647 } 648 649 static int cdns_update_slave_status(struct sdw_cdns *cdns, 650 u32 slave0, u32 slave1) 651 { 652 enum sdw_slave_status status[SDW_MAX_DEVICES + 1]; 653 bool is_slave = false; 654 u64 slave; 655 u32 mask; 656 int i, set_status; 657 658 /* combine the two status */ 659 slave = ((u64)slave1 << 32) | slave0; 660 memset(status, 0, sizeof(status)); 661 662 for (i = 0; i <= SDW_MAX_DEVICES; i++) { 663 mask = (slave >> (i * CDNS_MCP_SLAVE_STATUS_NUM)) & 664 CDNS_MCP_SLAVE_STATUS_BITS; 665 if (!mask) 666 continue; 667 668 is_slave = true; 669 set_status = 0; 670 671 if (mask & CDNS_MCP_SLAVE_INTSTAT_RESERVED) { 672 status[i] = SDW_SLAVE_RESERVED; 673 set_status++; 674 } 675 676 if (mask & CDNS_MCP_SLAVE_INTSTAT_ATTACHED) { 677 status[i] = SDW_SLAVE_ATTACHED; 678 set_status++; 679 } 680 681 if (mask & CDNS_MCP_SLAVE_INTSTAT_ALERT) { 682 status[i] = SDW_SLAVE_ALERT; 683 set_status++; 684 } 685 686 if (mask & CDNS_MCP_SLAVE_INTSTAT_NPRESENT) { 687 status[i] = SDW_SLAVE_UNATTACHED; 688 set_status++; 689 } 690 691 /* first check if Slave reported multiple status */ 692 if (set_status > 1) { 693 u32 val; 694 695 dev_warn_ratelimited(cdns->dev, 696 "Slave %d reported multiple Status: %d\n", 697 i, mask); 698 699 /* check latest status extracted from PING commands */ 700 val = cdns_readl(cdns, CDNS_MCP_SLAVE_STAT); 701 val >>= (i * 2); 702 703 switch (val & 0x3) { 704 case 0: 705 status[i] = SDW_SLAVE_UNATTACHED; 706 break; 707 case 1: 708 status[i] = SDW_SLAVE_ATTACHED; 709 break; 710 case 2: 711 status[i] = SDW_SLAVE_ALERT; 712 break; 713 case 3: 714 default: 715 status[i] = SDW_SLAVE_RESERVED; 716 break; 717 } 718 719 dev_warn_ratelimited(cdns->dev, 720 "Slave %d status updated to %d\n", 721 i, status[i]); 722 723 } 724 } 725 726 if (is_slave) 727 return sdw_handle_slave_status(&cdns->bus, status); 728 729 return 0; 730 } 731 732 /** 733 * sdw_cdns_irq() - Cadence interrupt handler 734 * @irq: irq number 735 * @dev_id: irq context 736 */ 737 irqreturn_t sdw_cdns_irq(int irq, void *dev_id) 738 { 739 struct sdw_cdns *cdns = dev_id; 740 u32 int_status; 741 int ret = IRQ_HANDLED; 742 743 /* Check if the link is up */ 744 if (!cdns->link_up) 745 return IRQ_NONE; 746 747 int_status = cdns_readl(cdns, CDNS_MCP_INTSTAT); 748 749 /* check for reserved values read as zero */ 750 if (int_status & CDNS_MCP_INT_RESERVED) 751 return IRQ_NONE; 752 753 if (!(int_status & CDNS_MCP_INT_IRQ)) 754 return IRQ_NONE; 755 756 if (int_status & CDNS_MCP_INT_RX_WL) { 757 cdns_read_response(cdns); 758 759 if (cdns->defer) { 760 cdns_fill_msg_resp(cdns, cdns->defer->msg, 761 cdns->defer->length, 0); 762 complete(&cdns->defer->complete); 763 cdns->defer = NULL; 764 } else { 765 complete(&cdns->tx_complete); 766 } 767 } 768 769 if (int_status & CDNS_MCP_INT_PARITY) { 770 /* Parity error detected by Master */ 771 dev_err_ratelimited(cdns->dev, "Parity error\n"); 772 } 773 774 if (int_status & CDNS_MCP_INT_CTRL_CLASH) { 775 /* Slave is driving bit slot during control word */ 776 dev_err_ratelimited(cdns->dev, "Bus clash for control word\n"); 777 } 778 779 if (int_status & CDNS_MCP_INT_DATA_CLASH) { 780 /* 781 * Multiple slaves trying to drive bit slot, or issue with 782 * ownership of data bits or Slave gone bonkers 783 */ 784 dev_err_ratelimited(cdns->dev, "Bus clash for data word\n"); 785 } 786 787 if (int_status & CDNS_MCP_INT_SLAVE_MASK) { 788 /* Mask the Slave interrupt and wake thread */ 789 cdns_updatel(cdns, CDNS_MCP_INTMASK, 790 CDNS_MCP_INT_SLAVE_MASK, 0); 791 792 int_status &= ~CDNS_MCP_INT_SLAVE_MASK; 793 ret = IRQ_WAKE_THREAD; 794 } 795 796 cdns_writel(cdns, CDNS_MCP_INTSTAT, int_status); 797 return ret; 798 } 799 EXPORT_SYMBOL(sdw_cdns_irq); 800 801 /** 802 * sdw_cdns_thread() - Cadence irq thread handler 803 * @irq: irq number 804 * @dev_id: irq context 805 */ 806 irqreturn_t sdw_cdns_thread(int irq, void *dev_id) 807 { 808 struct sdw_cdns *cdns = dev_id; 809 u32 slave0, slave1; 810 811 dev_dbg_ratelimited(cdns->dev, "Slave status change\n"); 812 813 slave0 = cdns_readl(cdns, CDNS_MCP_SLAVE_INTSTAT0); 814 slave1 = cdns_readl(cdns, CDNS_MCP_SLAVE_INTSTAT1); 815 816 cdns_update_slave_status(cdns, slave0, slave1); 817 cdns_writel(cdns, CDNS_MCP_SLAVE_INTSTAT0, slave0); 818 cdns_writel(cdns, CDNS_MCP_SLAVE_INTSTAT1, slave1); 819 820 /* clear and unmask Slave interrupt now */ 821 cdns_writel(cdns, CDNS_MCP_INTSTAT, CDNS_MCP_INT_SLAVE_MASK); 822 cdns_updatel(cdns, CDNS_MCP_INTMASK, 823 CDNS_MCP_INT_SLAVE_MASK, CDNS_MCP_INT_SLAVE_MASK); 824 825 return IRQ_HANDLED; 826 } 827 EXPORT_SYMBOL(sdw_cdns_thread); 828 829 /* 830 * init routines 831 */ 832 833 /** 834 * sdw_cdns_exit_reset() - Program reset parameters and start bus operations 835 * @cdns: Cadence instance 836 */ 837 int sdw_cdns_exit_reset(struct sdw_cdns *cdns) 838 { 839 /* program maximum length reset to be safe */ 840 cdns_updatel(cdns, CDNS_MCP_CONTROL, 841 CDNS_MCP_CONTROL_RST_DELAY, 842 CDNS_MCP_CONTROL_RST_DELAY); 843 844 /* use hardware generated reset */ 845 cdns_updatel(cdns, CDNS_MCP_CONTROL, 846 CDNS_MCP_CONTROL_HW_RST, 847 CDNS_MCP_CONTROL_HW_RST); 848 849 /* commit changes */ 850 cdns_updatel(cdns, CDNS_MCP_CONFIG_UPDATE, 851 CDNS_MCP_CONFIG_UPDATE_BIT, 852 CDNS_MCP_CONFIG_UPDATE_BIT); 853 854 /* don't wait here */ 855 return 0; 856 857 } 858 EXPORT_SYMBOL(sdw_cdns_exit_reset); 859 860 /** 861 * sdw_cdns_enable_slave_interrupt() - Enable SDW slave interrupts 862 * @cdns: Cadence instance 863 * @state: boolean for true/false 864 */ 865 static void cdns_enable_slave_interrupts(struct sdw_cdns *cdns, bool state) 866 { 867 u32 mask; 868 869 mask = cdns_readl(cdns, CDNS_MCP_INTMASK); 870 if (state) 871 mask |= CDNS_MCP_INT_SLAVE_MASK; 872 else 873 mask &= ~CDNS_MCP_INT_SLAVE_MASK; 874 875 cdns_writel(cdns, CDNS_MCP_INTMASK, mask); 876 } 877 878 /** 879 * sdw_cdns_enable_interrupt() - Enable SDW interrupts 880 * @cdns: Cadence instance 881 * @state: True if we are trying to enable interrupt. 882 */ 883 int sdw_cdns_enable_interrupt(struct sdw_cdns *cdns, bool state) 884 { 885 u32 slave_intmask0 = 0; 886 u32 slave_intmask1 = 0; 887 u32 mask = 0; 888 889 if (!state) 890 goto update_masks; 891 892 slave_intmask0 = CDNS_MCP_SLAVE_INTMASK0_MASK; 893 slave_intmask1 = CDNS_MCP_SLAVE_INTMASK1_MASK; 894 895 /* enable detection of all slave state changes */ 896 mask = CDNS_MCP_INT_SLAVE_MASK; 897 898 /* enable detection of bus issues */ 899 mask |= CDNS_MCP_INT_CTRL_CLASH | CDNS_MCP_INT_DATA_CLASH | 900 CDNS_MCP_INT_PARITY; 901 902 /* no detection of port interrupts for now */ 903 904 /* enable detection of RX fifo level */ 905 mask |= CDNS_MCP_INT_RX_WL; 906 907 /* 908 * CDNS_MCP_INT_IRQ needs to be set otherwise all previous 909 * settings are irrelevant 910 */ 911 mask |= CDNS_MCP_INT_IRQ; 912 913 if (interrupt_mask) /* parameter override */ 914 mask = interrupt_mask; 915 916 update_masks: 917 /* clear slave interrupt status before enabling interrupt */ 918 if (state) { 919 u32 slave_state; 920 921 slave_state = cdns_readl(cdns, CDNS_MCP_SLAVE_INTSTAT0); 922 cdns_writel(cdns, CDNS_MCP_SLAVE_INTSTAT0, slave_state); 923 slave_state = cdns_readl(cdns, CDNS_MCP_SLAVE_INTSTAT1); 924 cdns_writel(cdns, CDNS_MCP_SLAVE_INTSTAT1, slave_state); 925 } 926 927 cdns_writel(cdns, CDNS_MCP_SLAVE_INTMASK0, slave_intmask0); 928 cdns_writel(cdns, CDNS_MCP_SLAVE_INTMASK1, slave_intmask1); 929 cdns_writel(cdns, CDNS_MCP_INTMASK, mask); 930 931 return 0; 932 } 933 EXPORT_SYMBOL(sdw_cdns_enable_interrupt); 934 935 static int cdns_allocate_pdi(struct sdw_cdns *cdns, 936 struct sdw_cdns_pdi **stream, 937 u32 num, u32 pdi_offset) 938 { 939 struct sdw_cdns_pdi *pdi; 940 int i; 941 942 if (!num) 943 return 0; 944 945 pdi = devm_kcalloc(cdns->dev, num, sizeof(*pdi), GFP_KERNEL); 946 if (!pdi) 947 return -ENOMEM; 948 949 for (i = 0; i < num; i++) { 950 pdi[i].num = i + pdi_offset; 951 } 952 953 *stream = pdi; 954 return 0; 955 } 956 957 /** 958 * sdw_cdns_pdi_init() - PDI initialization routine 959 * 960 * @cdns: Cadence instance 961 * @config: Stream configurations 962 */ 963 int sdw_cdns_pdi_init(struct sdw_cdns *cdns, 964 struct sdw_cdns_stream_config config) 965 { 966 struct sdw_cdns_streams *stream; 967 int offset; 968 int ret; 969 970 cdns->pcm.num_bd = config.pcm_bd; 971 cdns->pcm.num_in = config.pcm_in; 972 cdns->pcm.num_out = config.pcm_out; 973 cdns->pdm.num_bd = config.pdm_bd; 974 cdns->pdm.num_in = config.pdm_in; 975 cdns->pdm.num_out = config.pdm_out; 976 977 /* Allocate PDIs for PCMs */ 978 stream = &cdns->pcm; 979 980 /* we allocate PDI0 and PDI1 which are used for Bulk */ 981 offset = 0; 982 983 ret = cdns_allocate_pdi(cdns, &stream->bd, 984 stream->num_bd, offset); 985 if (ret) 986 return ret; 987 988 offset += stream->num_bd; 989 990 ret = cdns_allocate_pdi(cdns, &stream->in, 991 stream->num_in, offset); 992 if (ret) 993 return ret; 994 995 offset += stream->num_in; 996 997 ret = cdns_allocate_pdi(cdns, &stream->out, 998 stream->num_out, offset); 999 if (ret) 1000 return ret; 1001 1002 /* Update total number of PCM PDIs */ 1003 stream->num_pdi = stream->num_bd + stream->num_in + stream->num_out; 1004 cdns->num_ports = stream->num_pdi; 1005 1006 /* Allocate PDIs for PDMs */ 1007 stream = &cdns->pdm; 1008 ret = cdns_allocate_pdi(cdns, &stream->bd, 1009 stream->num_bd, offset); 1010 if (ret) 1011 return ret; 1012 1013 offset += stream->num_bd; 1014 1015 ret = cdns_allocate_pdi(cdns, &stream->in, 1016 stream->num_in, offset); 1017 if (ret) 1018 return ret; 1019 1020 offset += stream->num_in; 1021 1022 ret = cdns_allocate_pdi(cdns, &stream->out, 1023 stream->num_out, offset); 1024 1025 if (ret) 1026 return ret; 1027 1028 /* Update total number of PDM PDIs */ 1029 stream->num_pdi = stream->num_bd + stream->num_in + stream->num_out; 1030 cdns->num_ports += stream->num_pdi; 1031 1032 return 0; 1033 } 1034 EXPORT_SYMBOL(sdw_cdns_pdi_init); 1035 1036 static u32 cdns_set_initial_frame_shape(int n_rows, int n_cols) 1037 { 1038 u32 val; 1039 int c; 1040 int r; 1041 1042 r = sdw_find_row_index(n_rows); 1043 c = sdw_find_col_index(n_cols) & CDNS_MCP_FRAME_SHAPE_COL_MASK; 1044 1045 val = (r << CDNS_MCP_FRAME_SHAPE_ROW_OFFSET) | c; 1046 1047 return val; 1048 } 1049 1050 static void cdns_init_clock_ctrl(struct sdw_cdns *cdns) 1051 { 1052 struct sdw_bus *bus = &cdns->bus; 1053 struct sdw_master_prop *prop = &bus->prop; 1054 u32 val; 1055 u32 ssp_interval; 1056 int divider; 1057 1058 /* Set clock divider */ 1059 divider = (prop->mclk_freq / prop->max_clk_freq) - 1; 1060 1061 cdns_updatel(cdns, CDNS_MCP_CLK_CTRL0, 1062 CDNS_MCP_CLK_MCLKD_MASK, divider); 1063 cdns_updatel(cdns, CDNS_MCP_CLK_CTRL1, 1064 CDNS_MCP_CLK_MCLKD_MASK, divider); 1065 1066 /* 1067 * Frame shape changes after initialization have to be done 1068 * with the bank switch mechanism 1069 */ 1070 val = cdns_set_initial_frame_shape(prop->default_row, 1071 prop->default_col); 1072 cdns_writel(cdns, CDNS_MCP_FRAME_SHAPE_INIT, val); 1073 1074 /* Set SSP interval to default value */ 1075 ssp_interval = prop->default_frame_rate / SDW_CADENCE_GSYNC_HZ; 1076 cdns_writel(cdns, CDNS_MCP_SSP_CTRL0, ssp_interval); 1077 cdns_writel(cdns, CDNS_MCP_SSP_CTRL1, ssp_interval); 1078 } 1079 1080 /** 1081 * sdw_cdns_init() - Cadence initialization 1082 * @cdns: Cadence instance 1083 */ 1084 int sdw_cdns_init(struct sdw_cdns *cdns) 1085 { 1086 u32 val; 1087 1088 cdns_init_clock_ctrl(cdns); 1089 1090 /* reset msg_count to default value of FIFOLEVEL */ 1091 cdns->msg_count = cdns_readl(cdns, CDNS_MCP_FIFOLEVEL); 1092 1093 /* flush command FIFOs */ 1094 cdns_updatel(cdns, CDNS_MCP_CONTROL, CDNS_MCP_CONTROL_CMD_RST, 1095 CDNS_MCP_CONTROL_CMD_RST); 1096 1097 /* Set cmd accept mode */ 1098 cdns_updatel(cdns, CDNS_MCP_CONTROL, CDNS_MCP_CONTROL_CMD_ACCEPT, 1099 CDNS_MCP_CONTROL_CMD_ACCEPT); 1100 1101 /* Configure mcp config */ 1102 val = cdns_readl(cdns, CDNS_MCP_CONFIG); 1103 1104 /* enable bus operations with clock and data */ 1105 val &= ~CDNS_MCP_CONFIG_OP; 1106 val |= CDNS_MCP_CONFIG_OP_NORMAL; 1107 1108 /* Set cmd mode for Tx and Rx cmds */ 1109 val &= ~CDNS_MCP_CONFIG_CMD; 1110 1111 /* Disable sniffer mode */ 1112 val &= ~CDNS_MCP_CONFIG_SNIFFER; 1113 1114 /* Disable auto bus release */ 1115 val &= ~CDNS_MCP_CONFIG_BUS_REL; 1116 1117 if (cdns->bus.multi_link) 1118 /* Set Multi-master mode to take gsync into account */ 1119 val |= CDNS_MCP_CONFIG_MMASTER; 1120 1121 /* leave frame delay to hardware default of 0x1F */ 1122 1123 /* leave command retry to hardware default of 0 */ 1124 1125 cdns_writel(cdns, CDNS_MCP_CONFIG, val); 1126 1127 /* changes will be committed later */ 1128 return 0; 1129 } 1130 EXPORT_SYMBOL(sdw_cdns_init); 1131 1132 int cdns_bus_conf(struct sdw_bus *bus, struct sdw_bus_params *params) 1133 { 1134 struct sdw_master_prop *prop = &bus->prop; 1135 struct sdw_cdns *cdns = bus_to_cdns(bus); 1136 int mcp_clkctrl_off; 1137 int divider; 1138 1139 if (!params->curr_dr_freq) { 1140 dev_err(cdns->dev, "NULL curr_dr_freq\n"); 1141 return -EINVAL; 1142 } 1143 1144 divider = prop->mclk_freq * SDW_DOUBLE_RATE_FACTOR / 1145 params->curr_dr_freq; 1146 divider--; /* divider is 1/(N+1) */ 1147 1148 if (params->next_bank) 1149 mcp_clkctrl_off = CDNS_MCP_CLK_CTRL1; 1150 else 1151 mcp_clkctrl_off = CDNS_MCP_CLK_CTRL0; 1152 1153 cdns_updatel(cdns, mcp_clkctrl_off, CDNS_MCP_CLK_MCLKD_MASK, divider); 1154 1155 return 0; 1156 } 1157 EXPORT_SYMBOL(cdns_bus_conf); 1158 1159 static int cdns_port_params(struct sdw_bus *bus, 1160 struct sdw_port_params *p_params, unsigned int bank) 1161 { 1162 struct sdw_cdns *cdns = bus_to_cdns(bus); 1163 int dpn_config = 0, dpn_config_off; 1164 1165 if (bank) 1166 dpn_config_off = CDNS_DPN_B1_CONFIG(p_params->num); 1167 else 1168 dpn_config_off = CDNS_DPN_B0_CONFIG(p_params->num); 1169 1170 dpn_config = cdns_readl(cdns, dpn_config_off); 1171 1172 dpn_config |= ((p_params->bps - 1) << 1173 SDW_REG_SHIFT(CDNS_DPN_CONFIG_WL)); 1174 dpn_config |= (p_params->flow_mode << 1175 SDW_REG_SHIFT(CDNS_DPN_CONFIG_PORT_FLOW)); 1176 dpn_config |= (p_params->data_mode << 1177 SDW_REG_SHIFT(CDNS_DPN_CONFIG_PORT_DAT)); 1178 1179 cdns_writel(cdns, dpn_config_off, dpn_config); 1180 1181 return 0; 1182 } 1183 1184 static int cdns_transport_params(struct sdw_bus *bus, 1185 struct sdw_transport_params *t_params, 1186 enum sdw_reg_bank bank) 1187 { 1188 struct sdw_cdns *cdns = bus_to_cdns(bus); 1189 int dpn_offsetctrl = 0, dpn_offsetctrl_off; 1190 int dpn_config = 0, dpn_config_off; 1191 int dpn_hctrl = 0, dpn_hctrl_off; 1192 int num = t_params->port_num; 1193 int dpn_samplectrl_off; 1194 1195 /* 1196 * Note: Only full data port is supported on the Master side for 1197 * both PCM and PDM ports. 1198 */ 1199 1200 if (bank) { 1201 dpn_config_off = CDNS_DPN_B1_CONFIG(num); 1202 dpn_samplectrl_off = CDNS_DPN_B1_SAMPLE_CTRL(num); 1203 dpn_hctrl_off = CDNS_DPN_B1_HCTRL(num); 1204 dpn_offsetctrl_off = CDNS_DPN_B1_OFFSET_CTRL(num); 1205 } else { 1206 dpn_config_off = CDNS_DPN_B0_CONFIG(num); 1207 dpn_samplectrl_off = CDNS_DPN_B0_SAMPLE_CTRL(num); 1208 dpn_hctrl_off = CDNS_DPN_B0_HCTRL(num); 1209 dpn_offsetctrl_off = CDNS_DPN_B0_OFFSET_CTRL(num); 1210 } 1211 1212 dpn_config = cdns_readl(cdns, dpn_config_off); 1213 1214 dpn_config |= (t_params->blk_grp_ctrl << 1215 SDW_REG_SHIFT(CDNS_DPN_CONFIG_BGC)); 1216 dpn_config |= (t_params->blk_pkg_mode << 1217 SDW_REG_SHIFT(CDNS_DPN_CONFIG_BPM)); 1218 cdns_writel(cdns, dpn_config_off, dpn_config); 1219 1220 dpn_offsetctrl |= (t_params->offset1 << 1221 SDW_REG_SHIFT(CDNS_DPN_OFFSET_CTRL_1)); 1222 dpn_offsetctrl |= (t_params->offset2 << 1223 SDW_REG_SHIFT(CDNS_DPN_OFFSET_CTRL_2)); 1224 cdns_writel(cdns, dpn_offsetctrl_off, dpn_offsetctrl); 1225 1226 dpn_hctrl |= (t_params->hstart << 1227 SDW_REG_SHIFT(CDNS_DPN_HCTRL_HSTART)); 1228 dpn_hctrl |= (t_params->hstop << SDW_REG_SHIFT(CDNS_DPN_HCTRL_HSTOP)); 1229 dpn_hctrl |= (t_params->lane_ctrl << 1230 SDW_REG_SHIFT(CDNS_DPN_HCTRL_LCTRL)); 1231 1232 cdns_writel(cdns, dpn_hctrl_off, dpn_hctrl); 1233 cdns_writel(cdns, dpn_samplectrl_off, (t_params->sample_interval - 1)); 1234 1235 return 0; 1236 } 1237 1238 static int cdns_port_enable(struct sdw_bus *bus, 1239 struct sdw_enable_ch *enable_ch, unsigned int bank) 1240 { 1241 struct sdw_cdns *cdns = bus_to_cdns(bus); 1242 int dpn_chnen_off, ch_mask; 1243 1244 if (bank) 1245 dpn_chnen_off = CDNS_DPN_B1_CH_EN(enable_ch->port_num); 1246 else 1247 dpn_chnen_off = CDNS_DPN_B0_CH_EN(enable_ch->port_num); 1248 1249 ch_mask = enable_ch->ch_mask * enable_ch->enable; 1250 cdns_writel(cdns, dpn_chnen_off, ch_mask); 1251 1252 return 0; 1253 } 1254 1255 static const struct sdw_master_port_ops cdns_port_ops = { 1256 .dpn_set_port_params = cdns_port_params, 1257 .dpn_set_port_transport_params = cdns_transport_params, 1258 .dpn_port_enable_ch = cdns_port_enable, 1259 }; 1260 1261 /** 1262 * sdw_cdns_is_clock_stop: Check clock status 1263 * 1264 * @cdns: Cadence instance 1265 */ 1266 bool sdw_cdns_is_clock_stop(struct sdw_cdns *cdns) 1267 { 1268 return !!(cdns_readl(cdns, CDNS_MCP_STAT) & CDNS_MCP_STAT_CLK_STOP); 1269 } 1270 EXPORT_SYMBOL(sdw_cdns_is_clock_stop); 1271 1272 /** 1273 * sdw_cdns_clock_stop: Cadence clock stop configuration routine 1274 * 1275 * @cdns: Cadence instance 1276 * @block_wake: prevent wakes if required by the platform 1277 */ 1278 int sdw_cdns_clock_stop(struct sdw_cdns *cdns, bool block_wake) 1279 { 1280 bool slave_present = false; 1281 struct sdw_slave *slave; 1282 int ret; 1283 1284 /* Check suspend status */ 1285 if (sdw_cdns_is_clock_stop(cdns)) { 1286 dev_dbg(cdns->dev, "Clock is already stopped\n"); 1287 return 0; 1288 } 1289 1290 /* 1291 * Before entering clock stop we mask the Slave 1292 * interrupts. This helps avoid having to deal with e.g. a 1293 * Slave becoming UNATTACHED while the clock is being stopped 1294 */ 1295 cdns_enable_slave_interrupts(cdns, false); 1296 1297 /* 1298 * For specific platforms, it is required to be able to put 1299 * master into a state in which it ignores wake-up trials 1300 * in clock stop state 1301 */ 1302 if (block_wake) 1303 cdns_updatel(cdns, CDNS_MCP_CONTROL, 1304 CDNS_MCP_CONTROL_BLOCK_WAKEUP, 1305 CDNS_MCP_CONTROL_BLOCK_WAKEUP); 1306 1307 list_for_each_entry(slave, &cdns->bus.slaves, node) { 1308 if (slave->status == SDW_SLAVE_ATTACHED || 1309 slave->status == SDW_SLAVE_ALERT) { 1310 slave_present = true; 1311 break; 1312 } 1313 } 1314 1315 /* 1316 * This CMD_ACCEPT should be used when there are no devices 1317 * attached on the link when entering clock stop mode. If this is 1318 * not set and there is a broadcast write then the command ignored 1319 * will be treated as a failure 1320 */ 1321 if (!slave_present) 1322 cdns_updatel(cdns, CDNS_MCP_CONTROL, 1323 CDNS_MCP_CONTROL_CMD_ACCEPT, 1324 CDNS_MCP_CONTROL_CMD_ACCEPT); 1325 else 1326 cdns_updatel(cdns, CDNS_MCP_CONTROL, 1327 CDNS_MCP_CONTROL_CMD_ACCEPT, 0); 1328 1329 /* commit changes */ 1330 ret = cdns_config_update(cdns); 1331 if (ret < 0) { 1332 dev_err(cdns->dev, "%s: config_update failed\n", __func__); 1333 return ret; 1334 } 1335 1336 /* Prepare slaves for clock stop */ 1337 ret = sdw_bus_prep_clk_stop(&cdns->bus); 1338 if (ret < 0) { 1339 dev_err(cdns->dev, "prepare clock stop failed %d", ret); 1340 return ret; 1341 } 1342 1343 /* 1344 * Enter clock stop mode and only report errors if there are 1345 * Slave devices present (ALERT or ATTACHED) 1346 */ 1347 ret = sdw_bus_clk_stop(&cdns->bus); 1348 if (ret < 0 && slave_present && ret != -ENODATA) { 1349 dev_err(cdns->dev, "bus clock stop failed %d", ret); 1350 return ret; 1351 } 1352 1353 ret = cdns_set_wait(cdns, CDNS_MCP_STAT, 1354 CDNS_MCP_STAT_CLK_STOP, 1355 CDNS_MCP_STAT_CLK_STOP); 1356 if (ret < 0) 1357 dev_err(cdns->dev, "Clock stop failed %d\n", ret); 1358 1359 return ret; 1360 } 1361 EXPORT_SYMBOL(sdw_cdns_clock_stop); 1362 1363 /** 1364 * sdw_cdns_clock_restart: Cadence PM clock restart configuration routine 1365 * 1366 * @cdns: Cadence instance 1367 * @bus_reset: context may be lost while in low power modes and the bus 1368 * may require a Severe Reset and re-enumeration after a wake. 1369 */ 1370 int sdw_cdns_clock_restart(struct sdw_cdns *cdns, bool bus_reset) 1371 { 1372 int ret; 1373 1374 /* unmask Slave interrupts that were masked when stopping the clock */ 1375 cdns_enable_slave_interrupts(cdns, true); 1376 1377 ret = cdns_clear_bit(cdns, CDNS_MCP_CONTROL, 1378 CDNS_MCP_CONTROL_CLK_STOP_CLR); 1379 if (ret < 0) { 1380 dev_err(cdns->dev, "Couldn't exit from clock stop\n"); 1381 return ret; 1382 } 1383 1384 ret = cdns_set_wait(cdns, CDNS_MCP_STAT, CDNS_MCP_STAT_CLK_STOP, 0); 1385 if (ret < 0) { 1386 dev_err(cdns->dev, "clock stop exit failed %d\n", ret); 1387 return ret; 1388 } 1389 1390 cdns_updatel(cdns, CDNS_MCP_CONTROL, 1391 CDNS_MCP_CONTROL_BLOCK_WAKEUP, 0); 1392 1393 /* 1394 * clear CMD_ACCEPT so that the command ignored 1395 * will be treated as a failure during a broadcast write 1396 */ 1397 cdns_updatel(cdns, CDNS_MCP_CONTROL, CDNS_MCP_CONTROL_CMD_ACCEPT, 0); 1398 1399 if (!bus_reset) { 1400 1401 /* enable bus operations with clock and data */ 1402 cdns_updatel(cdns, CDNS_MCP_CONFIG, 1403 CDNS_MCP_CONFIG_OP, 1404 CDNS_MCP_CONFIG_OP_NORMAL); 1405 1406 ret = cdns_config_update(cdns); 1407 if (ret < 0) { 1408 dev_err(cdns->dev, "%s: config_update failed\n", __func__); 1409 return ret; 1410 } 1411 1412 ret = sdw_bus_exit_clk_stop(&cdns->bus); 1413 if (ret < 0) 1414 dev_err(cdns->dev, "bus failed to exit clock stop %d\n", ret); 1415 } 1416 1417 return ret; 1418 } 1419 EXPORT_SYMBOL(sdw_cdns_clock_restart); 1420 1421 /** 1422 * sdw_cdns_probe() - Cadence probe routine 1423 * @cdns: Cadence instance 1424 */ 1425 int sdw_cdns_probe(struct sdw_cdns *cdns) 1426 { 1427 init_completion(&cdns->tx_complete); 1428 cdns->bus.port_ops = &cdns_port_ops; 1429 1430 return 0; 1431 } 1432 EXPORT_SYMBOL(sdw_cdns_probe); 1433 1434 int cdns_set_sdw_stream(struct snd_soc_dai *dai, 1435 void *stream, bool pcm, int direction) 1436 { 1437 struct sdw_cdns *cdns = snd_soc_dai_get_drvdata(dai); 1438 struct sdw_cdns_dma_data *dma; 1439 1440 dma = kzalloc(sizeof(*dma), GFP_KERNEL); 1441 if (!dma) 1442 return -ENOMEM; 1443 1444 if (pcm) 1445 dma->stream_type = SDW_STREAM_PCM; 1446 else 1447 dma->stream_type = SDW_STREAM_PDM; 1448 1449 dma->bus = &cdns->bus; 1450 dma->link_id = cdns->instance; 1451 1452 dma->stream = stream; 1453 1454 if (direction == SNDRV_PCM_STREAM_PLAYBACK) 1455 dai->playback_dma_data = dma; 1456 else 1457 dai->capture_dma_data = dma; 1458 1459 return 0; 1460 } 1461 EXPORT_SYMBOL(cdns_set_sdw_stream); 1462 1463 /** 1464 * cdns_find_pdi() - Find a free PDI 1465 * 1466 * @cdns: Cadence instance 1467 * @offset: Starting offset 1468 * @num: Number of PDIs 1469 * @pdi: PDI instances 1470 * @dai_id: DAI id 1471 * 1472 * Find a PDI for a given PDI array. The PDI num and dai_id are 1473 * expected to match, return NULL otherwise. 1474 */ 1475 static struct sdw_cdns_pdi *cdns_find_pdi(struct sdw_cdns *cdns, 1476 unsigned int offset, 1477 unsigned int num, 1478 struct sdw_cdns_pdi *pdi, 1479 int dai_id) 1480 { 1481 int i; 1482 1483 for (i = offset; i < offset + num; i++) 1484 if (pdi[i].num == dai_id) 1485 return &pdi[i]; 1486 1487 return NULL; 1488 } 1489 1490 /** 1491 * sdw_cdns_config_stream: Configure a stream 1492 * 1493 * @cdns: Cadence instance 1494 * @ch: Channel count 1495 * @dir: Data direction 1496 * @pdi: PDI to be used 1497 */ 1498 void sdw_cdns_config_stream(struct sdw_cdns *cdns, 1499 u32 ch, u32 dir, struct sdw_cdns_pdi *pdi) 1500 { 1501 u32 offset, val = 0; 1502 1503 if (dir == SDW_DATA_DIR_RX) 1504 val = CDNS_PORTCTRL_DIRN; 1505 1506 offset = CDNS_PORTCTRL + pdi->num * CDNS_PORT_OFFSET; 1507 cdns_updatel(cdns, offset, CDNS_PORTCTRL_DIRN, val); 1508 1509 val = pdi->num; 1510 val |= CDNS_PDI_CONFIG_SOFT_RESET; 1511 val |= ((1 << ch) - 1) << SDW_REG_SHIFT(CDNS_PDI_CONFIG_CHANNEL); 1512 cdns_writel(cdns, CDNS_PDI_CONFIG(pdi->num), val); 1513 } 1514 EXPORT_SYMBOL(sdw_cdns_config_stream); 1515 1516 /** 1517 * sdw_cdns_alloc_pdi() - Allocate a PDI 1518 * 1519 * @cdns: Cadence instance 1520 * @stream: Stream to be allocated 1521 * @ch: Channel count 1522 * @dir: Data direction 1523 * @dai_id: DAI id 1524 */ 1525 struct sdw_cdns_pdi *sdw_cdns_alloc_pdi(struct sdw_cdns *cdns, 1526 struct sdw_cdns_streams *stream, 1527 u32 ch, u32 dir, int dai_id) 1528 { 1529 struct sdw_cdns_pdi *pdi = NULL; 1530 1531 if (dir == SDW_DATA_DIR_RX) 1532 pdi = cdns_find_pdi(cdns, 0, stream->num_in, stream->in, 1533 dai_id); 1534 else 1535 pdi = cdns_find_pdi(cdns, 0, stream->num_out, stream->out, 1536 dai_id); 1537 1538 /* check if we found a PDI, else find in bi-directional */ 1539 if (!pdi) 1540 pdi = cdns_find_pdi(cdns, 2, stream->num_bd, stream->bd, 1541 dai_id); 1542 1543 if (pdi) { 1544 pdi->l_ch_num = 0; 1545 pdi->h_ch_num = ch - 1; 1546 pdi->dir = dir; 1547 pdi->ch_count = ch; 1548 } 1549 1550 return pdi; 1551 } 1552 EXPORT_SYMBOL(sdw_cdns_alloc_pdi); 1553 1554 MODULE_LICENSE("Dual BSD/GPL"); 1555 MODULE_DESCRIPTION("Cadence Soundwire Library"); 1556