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 } else if (no_ack) { 411 dev_dbg_ratelimited(cdns->dev, "Msg ignored for Slave %d\n", msg->dev_num); 412 return SDW_CMD_IGNORED; 413 } 414 415 /* fill response */ 416 for (i = 0; i < count; i++) 417 msg->buf[i + offset] = cdns->response_buf[i] >> 418 SDW_REG_SHIFT(CDNS_MCP_RESP_RDATA); 419 420 return SDW_CMD_OK; 421 } 422 423 static enum sdw_command_response 424 _cdns_xfer_msg(struct sdw_cdns *cdns, struct sdw_msg *msg, int cmd, 425 int offset, int count, bool defer) 426 { 427 unsigned long time; 428 u32 base, i, data; 429 u16 addr; 430 431 /* Program the watermark level for RX FIFO */ 432 if (cdns->msg_count != count) { 433 cdns_writel(cdns, CDNS_MCP_FIFOLEVEL, count); 434 cdns->msg_count = count; 435 } 436 437 base = CDNS_MCP_CMD_BASE; 438 addr = msg->addr; 439 440 for (i = 0; i < count; i++) { 441 data = msg->dev_num << SDW_REG_SHIFT(CDNS_MCP_CMD_DEV_ADDR); 442 data |= cmd << SDW_REG_SHIFT(CDNS_MCP_CMD_COMMAND); 443 data |= addr++ << SDW_REG_SHIFT(CDNS_MCP_CMD_REG_ADDR_L); 444 445 if (msg->flags == SDW_MSG_FLAG_WRITE) 446 data |= msg->buf[i + offset]; 447 448 data |= msg->ssp_sync << SDW_REG_SHIFT(CDNS_MCP_CMD_SSP_TAG); 449 cdns_writel(cdns, base, data); 450 base += CDNS_MCP_CMD_WORD_LEN; 451 } 452 453 if (defer) 454 return SDW_CMD_OK; 455 456 /* wait for timeout or response */ 457 time = wait_for_completion_timeout(&cdns->tx_complete, 458 msecs_to_jiffies(CDNS_TX_TIMEOUT)); 459 if (!time) { 460 dev_err(cdns->dev, "IO transfer timed out, cmd %d device %d addr %x len %d\n", 461 cmd, msg->dev_num, msg->addr, msg->len); 462 msg->len = 0; 463 return SDW_CMD_TIMEOUT; 464 } 465 466 return cdns_fill_msg_resp(cdns, msg, count, offset); 467 } 468 469 static enum sdw_command_response 470 cdns_program_scp_addr(struct sdw_cdns *cdns, struct sdw_msg *msg) 471 { 472 int nack = 0, no_ack = 0; 473 unsigned long time; 474 u32 data[2], base; 475 int i; 476 477 /* Program the watermark level for RX FIFO */ 478 if (cdns->msg_count != CDNS_SCP_RX_FIFOLEVEL) { 479 cdns_writel(cdns, CDNS_MCP_FIFOLEVEL, CDNS_SCP_RX_FIFOLEVEL); 480 cdns->msg_count = CDNS_SCP_RX_FIFOLEVEL; 481 } 482 483 data[0] = msg->dev_num << SDW_REG_SHIFT(CDNS_MCP_CMD_DEV_ADDR); 484 data[0] |= 0x3 << SDW_REG_SHIFT(CDNS_MCP_CMD_COMMAND); 485 data[1] = data[0]; 486 487 data[0] |= SDW_SCP_ADDRPAGE1 << SDW_REG_SHIFT(CDNS_MCP_CMD_REG_ADDR_L); 488 data[1] |= SDW_SCP_ADDRPAGE2 << SDW_REG_SHIFT(CDNS_MCP_CMD_REG_ADDR_L); 489 490 data[0] |= msg->addr_page1; 491 data[1] |= msg->addr_page2; 492 493 base = CDNS_MCP_CMD_BASE; 494 cdns_writel(cdns, base, data[0]); 495 base += CDNS_MCP_CMD_WORD_LEN; 496 cdns_writel(cdns, base, data[1]); 497 498 time = wait_for_completion_timeout(&cdns->tx_complete, 499 msecs_to_jiffies(CDNS_TX_TIMEOUT)); 500 if (!time) { 501 dev_err(cdns->dev, "SCP Msg trf timed out\n"); 502 msg->len = 0; 503 return SDW_CMD_TIMEOUT; 504 } 505 506 /* check response the writes */ 507 for (i = 0; i < 2; i++) { 508 if (!(cdns->response_buf[i] & CDNS_MCP_RESP_ACK)) { 509 no_ack = 1; 510 dev_err(cdns->dev, "Program SCP Ack not received\n"); 511 if (cdns->response_buf[i] & CDNS_MCP_RESP_NACK) { 512 nack = 1; 513 dev_err(cdns->dev, "Program SCP NACK received\n"); 514 } 515 } 516 } 517 518 /* For NACK, NO ack, don't return err if we are in Broadcast mode */ 519 if (nack) { 520 dev_err_ratelimited(cdns->dev, 521 "SCP_addrpage NACKed for Slave %d\n", msg->dev_num); 522 return SDW_CMD_FAIL; 523 } else if (no_ack) { 524 dev_dbg_ratelimited(cdns->dev, 525 "SCP_addrpage ignored for Slave %d\n", msg->dev_num); 526 return SDW_CMD_IGNORED; 527 } 528 529 return SDW_CMD_OK; 530 } 531 532 static int cdns_prep_msg(struct sdw_cdns *cdns, struct sdw_msg *msg, int *cmd) 533 { 534 int ret; 535 536 if (msg->page) { 537 ret = cdns_program_scp_addr(cdns, msg); 538 if (ret) { 539 msg->len = 0; 540 return ret; 541 } 542 } 543 544 switch (msg->flags) { 545 case SDW_MSG_FLAG_READ: 546 *cmd = CDNS_MCP_CMD_READ; 547 break; 548 549 case SDW_MSG_FLAG_WRITE: 550 *cmd = CDNS_MCP_CMD_WRITE; 551 break; 552 553 default: 554 dev_err(cdns->dev, "Invalid msg cmd: %d\n", msg->flags); 555 return -EINVAL; 556 } 557 558 return 0; 559 } 560 561 enum sdw_command_response 562 cdns_xfer_msg(struct sdw_bus *bus, struct sdw_msg *msg) 563 { 564 struct sdw_cdns *cdns = bus_to_cdns(bus); 565 int cmd = 0, ret, i; 566 567 ret = cdns_prep_msg(cdns, msg, &cmd); 568 if (ret) 569 return SDW_CMD_FAIL_OTHER; 570 571 for (i = 0; i < msg->len / CDNS_MCP_CMD_LEN; i++) { 572 ret = _cdns_xfer_msg(cdns, msg, cmd, i * CDNS_MCP_CMD_LEN, 573 CDNS_MCP_CMD_LEN, false); 574 if (ret < 0) 575 goto exit; 576 } 577 578 if (!(msg->len % CDNS_MCP_CMD_LEN)) 579 goto exit; 580 581 ret = _cdns_xfer_msg(cdns, msg, cmd, i * CDNS_MCP_CMD_LEN, 582 msg->len % CDNS_MCP_CMD_LEN, false); 583 584 exit: 585 return ret; 586 } 587 EXPORT_SYMBOL(cdns_xfer_msg); 588 589 enum sdw_command_response 590 cdns_xfer_msg_defer(struct sdw_bus *bus, 591 struct sdw_msg *msg, struct sdw_defer *defer) 592 { 593 struct sdw_cdns *cdns = bus_to_cdns(bus); 594 int cmd = 0, ret; 595 596 /* for defer only 1 message is supported */ 597 if (msg->len > 1) 598 return -ENOTSUPP; 599 600 ret = cdns_prep_msg(cdns, msg, &cmd); 601 if (ret) 602 return SDW_CMD_FAIL_OTHER; 603 604 cdns->defer = defer; 605 cdns->defer->length = msg->len; 606 607 return _cdns_xfer_msg(cdns, msg, cmd, 0, msg->len, true); 608 } 609 EXPORT_SYMBOL(cdns_xfer_msg_defer); 610 611 enum sdw_command_response 612 cdns_reset_page_addr(struct sdw_bus *bus, unsigned int dev_num) 613 { 614 struct sdw_cdns *cdns = bus_to_cdns(bus); 615 struct sdw_msg msg; 616 617 /* Create dummy message with valid device number */ 618 memset(&msg, 0, sizeof(msg)); 619 msg.dev_num = dev_num; 620 621 return cdns_program_scp_addr(cdns, &msg); 622 } 623 EXPORT_SYMBOL(cdns_reset_page_addr); 624 625 /* 626 * IRQ handling 627 */ 628 629 static void cdns_read_response(struct sdw_cdns *cdns) 630 { 631 u32 num_resp, cmd_base; 632 int i; 633 634 num_resp = cdns_readl(cdns, CDNS_MCP_FIFOSTAT); 635 num_resp &= CDNS_MCP_RX_FIFO_AVAIL; 636 637 cmd_base = CDNS_MCP_CMD_BASE; 638 639 for (i = 0; i < num_resp; i++) { 640 cdns->response_buf[i] = cdns_readl(cdns, cmd_base); 641 cmd_base += CDNS_MCP_CMD_WORD_LEN; 642 } 643 } 644 645 static int cdns_update_slave_status(struct sdw_cdns *cdns, 646 u32 slave0, u32 slave1) 647 { 648 enum sdw_slave_status status[SDW_MAX_DEVICES + 1]; 649 bool is_slave = false; 650 u64 slave; 651 u32 mask; 652 int i, set_status; 653 654 /* combine the two status */ 655 slave = ((u64)slave1 << 32) | slave0; 656 memset(status, 0, sizeof(status)); 657 658 for (i = 0; i <= SDW_MAX_DEVICES; i++) { 659 mask = (slave >> (i * CDNS_MCP_SLAVE_STATUS_NUM)) & 660 CDNS_MCP_SLAVE_STATUS_BITS; 661 if (!mask) 662 continue; 663 664 is_slave = true; 665 set_status = 0; 666 667 if (mask & CDNS_MCP_SLAVE_INTSTAT_RESERVED) { 668 status[i] = SDW_SLAVE_RESERVED; 669 set_status++; 670 } 671 672 if (mask & CDNS_MCP_SLAVE_INTSTAT_ATTACHED) { 673 status[i] = SDW_SLAVE_ATTACHED; 674 set_status++; 675 } 676 677 if (mask & CDNS_MCP_SLAVE_INTSTAT_ALERT) { 678 status[i] = SDW_SLAVE_ALERT; 679 set_status++; 680 } 681 682 if (mask & CDNS_MCP_SLAVE_INTSTAT_NPRESENT) { 683 status[i] = SDW_SLAVE_UNATTACHED; 684 set_status++; 685 } 686 687 /* first check if Slave reported multiple status */ 688 if (set_status > 1) { 689 u32 val; 690 691 dev_warn_ratelimited(cdns->dev, 692 "Slave %d reported multiple Status: %d\n", 693 i, mask); 694 695 /* check latest status extracted from PING commands */ 696 val = cdns_readl(cdns, CDNS_MCP_SLAVE_STAT); 697 val >>= (i * 2); 698 699 switch (val & 0x3) { 700 case 0: 701 status[i] = SDW_SLAVE_UNATTACHED; 702 break; 703 case 1: 704 status[i] = SDW_SLAVE_ATTACHED; 705 break; 706 case 2: 707 status[i] = SDW_SLAVE_ALERT; 708 break; 709 case 3: 710 default: 711 status[i] = SDW_SLAVE_RESERVED; 712 break; 713 } 714 715 dev_warn_ratelimited(cdns->dev, 716 "Slave %d status updated to %d\n", 717 i, status[i]); 718 719 } 720 } 721 722 if (is_slave) 723 return sdw_handle_slave_status(&cdns->bus, status); 724 725 return 0; 726 } 727 728 /** 729 * sdw_cdns_irq() - Cadence interrupt handler 730 * @irq: irq number 731 * @dev_id: irq context 732 */ 733 irqreturn_t sdw_cdns_irq(int irq, void *dev_id) 734 { 735 struct sdw_cdns *cdns = dev_id; 736 u32 int_status; 737 int ret = IRQ_HANDLED; 738 739 /* Check if the link is up */ 740 if (!cdns->link_up) 741 return IRQ_NONE; 742 743 int_status = cdns_readl(cdns, CDNS_MCP_INTSTAT); 744 745 /* check for reserved values read as zero */ 746 if (int_status & CDNS_MCP_INT_RESERVED) 747 return IRQ_NONE; 748 749 if (!(int_status & CDNS_MCP_INT_IRQ)) 750 return IRQ_NONE; 751 752 if (int_status & CDNS_MCP_INT_RX_WL) { 753 cdns_read_response(cdns); 754 755 if (cdns->defer) { 756 cdns_fill_msg_resp(cdns, cdns->defer->msg, 757 cdns->defer->length, 0); 758 complete(&cdns->defer->complete); 759 cdns->defer = NULL; 760 } else { 761 complete(&cdns->tx_complete); 762 } 763 } 764 765 if (int_status & CDNS_MCP_INT_PARITY) { 766 /* Parity error detected by Master */ 767 dev_err_ratelimited(cdns->dev, "Parity error\n"); 768 } 769 770 if (int_status & CDNS_MCP_INT_CTRL_CLASH) { 771 /* Slave is driving bit slot during control word */ 772 dev_err_ratelimited(cdns->dev, "Bus clash for control word\n"); 773 } 774 775 if (int_status & CDNS_MCP_INT_DATA_CLASH) { 776 /* 777 * Multiple slaves trying to drive bit slot, or issue with 778 * ownership of data bits or Slave gone bonkers 779 */ 780 dev_err_ratelimited(cdns->dev, "Bus clash for data word\n"); 781 } 782 783 if (int_status & CDNS_MCP_INT_SLAVE_MASK) { 784 /* Mask the Slave interrupt and wake thread */ 785 cdns_updatel(cdns, CDNS_MCP_INTMASK, 786 CDNS_MCP_INT_SLAVE_MASK, 0); 787 788 int_status &= ~CDNS_MCP_INT_SLAVE_MASK; 789 ret = IRQ_WAKE_THREAD; 790 } 791 792 cdns_writel(cdns, CDNS_MCP_INTSTAT, int_status); 793 return ret; 794 } 795 EXPORT_SYMBOL(sdw_cdns_irq); 796 797 /** 798 * sdw_cdns_thread() - Cadence irq thread handler 799 * @irq: irq number 800 * @dev_id: irq context 801 */ 802 irqreturn_t sdw_cdns_thread(int irq, void *dev_id) 803 { 804 struct sdw_cdns *cdns = dev_id; 805 u32 slave0, slave1; 806 807 dev_dbg_ratelimited(cdns->dev, "Slave status change\n"); 808 809 slave0 = cdns_readl(cdns, CDNS_MCP_SLAVE_INTSTAT0); 810 slave1 = cdns_readl(cdns, CDNS_MCP_SLAVE_INTSTAT1); 811 812 cdns_update_slave_status(cdns, slave0, slave1); 813 cdns_writel(cdns, CDNS_MCP_SLAVE_INTSTAT0, slave0); 814 cdns_writel(cdns, CDNS_MCP_SLAVE_INTSTAT1, slave1); 815 816 /* clear and unmask Slave interrupt now */ 817 cdns_writel(cdns, CDNS_MCP_INTSTAT, CDNS_MCP_INT_SLAVE_MASK); 818 cdns_updatel(cdns, CDNS_MCP_INTMASK, 819 CDNS_MCP_INT_SLAVE_MASK, CDNS_MCP_INT_SLAVE_MASK); 820 821 return IRQ_HANDLED; 822 } 823 EXPORT_SYMBOL(sdw_cdns_thread); 824 825 /* 826 * init routines 827 */ 828 829 /** 830 * sdw_cdns_exit_reset() - Program reset parameters and start bus operations 831 * @cdns: Cadence instance 832 */ 833 int sdw_cdns_exit_reset(struct sdw_cdns *cdns) 834 { 835 /* program maximum length reset to be safe */ 836 cdns_updatel(cdns, CDNS_MCP_CONTROL, 837 CDNS_MCP_CONTROL_RST_DELAY, 838 CDNS_MCP_CONTROL_RST_DELAY); 839 840 /* use hardware generated reset */ 841 cdns_updatel(cdns, CDNS_MCP_CONTROL, 842 CDNS_MCP_CONTROL_HW_RST, 843 CDNS_MCP_CONTROL_HW_RST); 844 845 /* commit changes */ 846 cdns_updatel(cdns, CDNS_MCP_CONFIG_UPDATE, 847 CDNS_MCP_CONFIG_UPDATE_BIT, 848 CDNS_MCP_CONFIG_UPDATE_BIT); 849 850 /* don't wait here */ 851 return 0; 852 853 } 854 EXPORT_SYMBOL(sdw_cdns_exit_reset); 855 856 /** 857 * sdw_cdns_enable_slave_interrupt() - Enable SDW slave interrupts 858 * @cdns: Cadence instance 859 * @state: boolean for true/false 860 */ 861 static void cdns_enable_slave_interrupts(struct sdw_cdns *cdns, bool state) 862 { 863 u32 mask; 864 865 mask = cdns_readl(cdns, CDNS_MCP_INTMASK); 866 if (state) 867 mask |= CDNS_MCP_INT_SLAVE_MASK; 868 else 869 mask &= ~CDNS_MCP_INT_SLAVE_MASK; 870 871 cdns_writel(cdns, CDNS_MCP_INTMASK, mask); 872 } 873 874 /** 875 * sdw_cdns_enable_interrupt() - Enable SDW interrupts 876 * @cdns: Cadence instance 877 * @state: True if we are trying to enable interrupt. 878 */ 879 int sdw_cdns_enable_interrupt(struct sdw_cdns *cdns, bool state) 880 { 881 u32 slave_intmask0 = 0; 882 u32 slave_intmask1 = 0; 883 u32 mask = 0; 884 885 if (!state) 886 goto update_masks; 887 888 slave_intmask0 = CDNS_MCP_SLAVE_INTMASK0_MASK; 889 slave_intmask1 = CDNS_MCP_SLAVE_INTMASK1_MASK; 890 891 /* enable detection of all slave state changes */ 892 mask = CDNS_MCP_INT_SLAVE_MASK; 893 894 /* enable detection of bus issues */ 895 mask |= CDNS_MCP_INT_CTRL_CLASH | CDNS_MCP_INT_DATA_CLASH | 896 CDNS_MCP_INT_PARITY; 897 898 /* no detection of port interrupts for now */ 899 900 /* enable detection of RX fifo level */ 901 mask |= CDNS_MCP_INT_RX_WL; 902 903 /* 904 * CDNS_MCP_INT_IRQ needs to be set otherwise all previous 905 * settings are irrelevant 906 */ 907 mask |= CDNS_MCP_INT_IRQ; 908 909 if (interrupt_mask) /* parameter override */ 910 mask = interrupt_mask; 911 912 update_masks: 913 /* clear slave interrupt status before enabling interrupt */ 914 if (state) { 915 u32 slave_state; 916 917 slave_state = cdns_readl(cdns, CDNS_MCP_SLAVE_INTSTAT0); 918 cdns_writel(cdns, CDNS_MCP_SLAVE_INTSTAT0, slave_state); 919 slave_state = cdns_readl(cdns, CDNS_MCP_SLAVE_INTSTAT1); 920 cdns_writel(cdns, CDNS_MCP_SLAVE_INTSTAT1, slave_state); 921 } 922 923 cdns_writel(cdns, CDNS_MCP_SLAVE_INTMASK0, slave_intmask0); 924 cdns_writel(cdns, CDNS_MCP_SLAVE_INTMASK1, slave_intmask1); 925 cdns_writel(cdns, CDNS_MCP_INTMASK, mask); 926 927 return 0; 928 } 929 EXPORT_SYMBOL(sdw_cdns_enable_interrupt); 930 931 static int cdns_allocate_pdi(struct sdw_cdns *cdns, 932 struct sdw_cdns_pdi **stream, 933 u32 num, u32 pdi_offset) 934 { 935 struct sdw_cdns_pdi *pdi; 936 int i; 937 938 if (!num) 939 return 0; 940 941 pdi = devm_kcalloc(cdns->dev, num, sizeof(*pdi), GFP_KERNEL); 942 if (!pdi) 943 return -ENOMEM; 944 945 for (i = 0; i < num; i++) { 946 pdi[i].num = i + pdi_offset; 947 } 948 949 *stream = pdi; 950 return 0; 951 } 952 953 /** 954 * sdw_cdns_pdi_init() - PDI initialization routine 955 * 956 * @cdns: Cadence instance 957 * @config: Stream configurations 958 */ 959 int sdw_cdns_pdi_init(struct sdw_cdns *cdns, 960 struct sdw_cdns_stream_config config) 961 { 962 struct sdw_cdns_streams *stream; 963 int offset; 964 int ret; 965 966 cdns->pcm.num_bd = config.pcm_bd; 967 cdns->pcm.num_in = config.pcm_in; 968 cdns->pcm.num_out = config.pcm_out; 969 cdns->pdm.num_bd = config.pdm_bd; 970 cdns->pdm.num_in = config.pdm_in; 971 cdns->pdm.num_out = config.pdm_out; 972 973 /* Allocate PDIs for PCMs */ 974 stream = &cdns->pcm; 975 976 /* we allocate PDI0 and PDI1 which are used for Bulk */ 977 offset = 0; 978 979 ret = cdns_allocate_pdi(cdns, &stream->bd, 980 stream->num_bd, offset); 981 if (ret) 982 return ret; 983 984 offset += stream->num_bd; 985 986 ret = cdns_allocate_pdi(cdns, &stream->in, 987 stream->num_in, offset); 988 if (ret) 989 return ret; 990 991 offset += stream->num_in; 992 993 ret = cdns_allocate_pdi(cdns, &stream->out, 994 stream->num_out, offset); 995 if (ret) 996 return ret; 997 998 /* Update total number of PCM PDIs */ 999 stream->num_pdi = stream->num_bd + stream->num_in + stream->num_out; 1000 cdns->num_ports = stream->num_pdi; 1001 1002 /* Allocate PDIs for PDMs */ 1003 stream = &cdns->pdm; 1004 ret = cdns_allocate_pdi(cdns, &stream->bd, 1005 stream->num_bd, offset); 1006 if (ret) 1007 return ret; 1008 1009 offset += stream->num_bd; 1010 1011 ret = cdns_allocate_pdi(cdns, &stream->in, 1012 stream->num_in, offset); 1013 if (ret) 1014 return ret; 1015 1016 offset += stream->num_in; 1017 1018 ret = cdns_allocate_pdi(cdns, &stream->out, 1019 stream->num_out, offset); 1020 1021 if (ret) 1022 return ret; 1023 1024 /* Update total number of PDM PDIs */ 1025 stream->num_pdi = stream->num_bd + stream->num_in + stream->num_out; 1026 cdns->num_ports += stream->num_pdi; 1027 1028 return 0; 1029 } 1030 EXPORT_SYMBOL(sdw_cdns_pdi_init); 1031 1032 static u32 cdns_set_initial_frame_shape(int n_rows, int n_cols) 1033 { 1034 u32 val; 1035 int c; 1036 int r; 1037 1038 r = sdw_find_row_index(n_rows); 1039 c = sdw_find_col_index(n_cols) & CDNS_MCP_FRAME_SHAPE_COL_MASK; 1040 1041 val = (r << CDNS_MCP_FRAME_SHAPE_ROW_OFFSET) | c; 1042 1043 return val; 1044 } 1045 1046 static void cdns_init_clock_ctrl(struct sdw_cdns *cdns) 1047 { 1048 struct sdw_bus *bus = &cdns->bus; 1049 struct sdw_master_prop *prop = &bus->prop; 1050 u32 val; 1051 u32 ssp_interval; 1052 int divider; 1053 1054 /* Set clock divider */ 1055 divider = (prop->mclk_freq / prop->max_clk_freq) - 1; 1056 1057 cdns_updatel(cdns, CDNS_MCP_CLK_CTRL0, 1058 CDNS_MCP_CLK_MCLKD_MASK, divider); 1059 cdns_updatel(cdns, CDNS_MCP_CLK_CTRL1, 1060 CDNS_MCP_CLK_MCLKD_MASK, divider); 1061 1062 /* 1063 * Frame shape changes after initialization have to be done 1064 * with the bank switch mechanism 1065 */ 1066 val = cdns_set_initial_frame_shape(prop->default_row, 1067 prop->default_col); 1068 cdns_writel(cdns, CDNS_MCP_FRAME_SHAPE_INIT, val); 1069 1070 /* Set SSP interval to default value */ 1071 ssp_interval = prop->default_frame_rate / SDW_CADENCE_GSYNC_HZ; 1072 cdns_writel(cdns, CDNS_MCP_SSP_CTRL0, ssp_interval); 1073 cdns_writel(cdns, CDNS_MCP_SSP_CTRL1, ssp_interval); 1074 } 1075 1076 /** 1077 * sdw_cdns_init() - Cadence initialization 1078 * @cdns: Cadence instance 1079 */ 1080 int sdw_cdns_init(struct sdw_cdns *cdns) 1081 { 1082 u32 val; 1083 1084 cdns_init_clock_ctrl(cdns); 1085 1086 /* reset msg_count to default value of FIFOLEVEL */ 1087 cdns->msg_count = cdns_readl(cdns, CDNS_MCP_FIFOLEVEL); 1088 1089 /* flush command FIFOs */ 1090 cdns_updatel(cdns, CDNS_MCP_CONTROL, CDNS_MCP_CONTROL_CMD_RST, 1091 CDNS_MCP_CONTROL_CMD_RST); 1092 1093 /* Set cmd accept mode */ 1094 cdns_updatel(cdns, CDNS_MCP_CONTROL, CDNS_MCP_CONTROL_CMD_ACCEPT, 1095 CDNS_MCP_CONTROL_CMD_ACCEPT); 1096 1097 /* Configure mcp config */ 1098 val = cdns_readl(cdns, CDNS_MCP_CONFIG); 1099 1100 /* enable bus operations with clock and data */ 1101 val &= ~CDNS_MCP_CONFIG_OP; 1102 val |= CDNS_MCP_CONFIG_OP_NORMAL; 1103 1104 /* Set cmd mode for Tx and Rx cmds */ 1105 val &= ~CDNS_MCP_CONFIG_CMD; 1106 1107 /* Disable sniffer mode */ 1108 val &= ~CDNS_MCP_CONFIG_SNIFFER; 1109 1110 /* Disable auto bus release */ 1111 val &= ~CDNS_MCP_CONFIG_BUS_REL; 1112 1113 if (cdns->bus.multi_link) 1114 /* Set Multi-master mode to take gsync into account */ 1115 val |= CDNS_MCP_CONFIG_MMASTER; 1116 1117 /* leave frame delay to hardware default of 0x1F */ 1118 1119 /* leave command retry to hardware default of 0 */ 1120 1121 cdns_writel(cdns, CDNS_MCP_CONFIG, val); 1122 1123 /* changes will be committed later */ 1124 return 0; 1125 } 1126 EXPORT_SYMBOL(sdw_cdns_init); 1127 1128 int cdns_bus_conf(struct sdw_bus *bus, struct sdw_bus_params *params) 1129 { 1130 struct sdw_master_prop *prop = &bus->prop; 1131 struct sdw_cdns *cdns = bus_to_cdns(bus); 1132 int mcp_clkctrl_off; 1133 int divider; 1134 1135 if (!params->curr_dr_freq) { 1136 dev_err(cdns->dev, "NULL curr_dr_freq\n"); 1137 return -EINVAL; 1138 } 1139 1140 divider = prop->mclk_freq * SDW_DOUBLE_RATE_FACTOR / 1141 params->curr_dr_freq; 1142 divider--; /* divider is 1/(N+1) */ 1143 1144 if (params->next_bank) 1145 mcp_clkctrl_off = CDNS_MCP_CLK_CTRL1; 1146 else 1147 mcp_clkctrl_off = CDNS_MCP_CLK_CTRL0; 1148 1149 cdns_updatel(cdns, mcp_clkctrl_off, CDNS_MCP_CLK_MCLKD_MASK, divider); 1150 1151 return 0; 1152 } 1153 EXPORT_SYMBOL(cdns_bus_conf); 1154 1155 static int cdns_port_params(struct sdw_bus *bus, 1156 struct sdw_port_params *p_params, unsigned int bank) 1157 { 1158 struct sdw_cdns *cdns = bus_to_cdns(bus); 1159 int dpn_config = 0, dpn_config_off; 1160 1161 if (bank) 1162 dpn_config_off = CDNS_DPN_B1_CONFIG(p_params->num); 1163 else 1164 dpn_config_off = CDNS_DPN_B0_CONFIG(p_params->num); 1165 1166 dpn_config = cdns_readl(cdns, dpn_config_off); 1167 1168 dpn_config |= ((p_params->bps - 1) << 1169 SDW_REG_SHIFT(CDNS_DPN_CONFIG_WL)); 1170 dpn_config |= (p_params->flow_mode << 1171 SDW_REG_SHIFT(CDNS_DPN_CONFIG_PORT_FLOW)); 1172 dpn_config |= (p_params->data_mode << 1173 SDW_REG_SHIFT(CDNS_DPN_CONFIG_PORT_DAT)); 1174 1175 cdns_writel(cdns, dpn_config_off, dpn_config); 1176 1177 return 0; 1178 } 1179 1180 static int cdns_transport_params(struct sdw_bus *bus, 1181 struct sdw_transport_params *t_params, 1182 enum sdw_reg_bank bank) 1183 { 1184 struct sdw_cdns *cdns = bus_to_cdns(bus); 1185 int dpn_offsetctrl = 0, dpn_offsetctrl_off; 1186 int dpn_config = 0, dpn_config_off; 1187 int dpn_hctrl = 0, dpn_hctrl_off; 1188 int num = t_params->port_num; 1189 int dpn_samplectrl_off; 1190 1191 /* 1192 * Note: Only full data port is supported on the Master side for 1193 * both PCM and PDM ports. 1194 */ 1195 1196 if (bank) { 1197 dpn_config_off = CDNS_DPN_B1_CONFIG(num); 1198 dpn_samplectrl_off = CDNS_DPN_B1_SAMPLE_CTRL(num); 1199 dpn_hctrl_off = CDNS_DPN_B1_HCTRL(num); 1200 dpn_offsetctrl_off = CDNS_DPN_B1_OFFSET_CTRL(num); 1201 } else { 1202 dpn_config_off = CDNS_DPN_B0_CONFIG(num); 1203 dpn_samplectrl_off = CDNS_DPN_B0_SAMPLE_CTRL(num); 1204 dpn_hctrl_off = CDNS_DPN_B0_HCTRL(num); 1205 dpn_offsetctrl_off = CDNS_DPN_B0_OFFSET_CTRL(num); 1206 } 1207 1208 dpn_config = cdns_readl(cdns, dpn_config_off); 1209 1210 dpn_config |= (t_params->blk_grp_ctrl << 1211 SDW_REG_SHIFT(CDNS_DPN_CONFIG_BGC)); 1212 dpn_config |= (t_params->blk_pkg_mode << 1213 SDW_REG_SHIFT(CDNS_DPN_CONFIG_BPM)); 1214 cdns_writel(cdns, dpn_config_off, dpn_config); 1215 1216 dpn_offsetctrl |= (t_params->offset1 << 1217 SDW_REG_SHIFT(CDNS_DPN_OFFSET_CTRL_1)); 1218 dpn_offsetctrl |= (t_params->offset2 << 1219 SDW_REG_SHIFT(CDNS_DPN_OFFSET_CTRL_2)); 1220 cdns_writel(cdns, dpn_offsetctrl_off, dpn_offsetctrl); 1221 1222 dpn_hctrl |= (t_params->hstart << 1223 SDW_REG_SHIFT(CDNS_DPN_HCTRL_HSTART)); 1224 dpn_hctrl |= (t_params->hstop << SDW_REG_SHIFT(CDNS_DPN_HCTRL_HSTOP)); 1225 dpn_hctrl |= (t_params->lane_ctrl << 1226 SDW_REG_SHIFT(CDNS_DPN_HCTRL_LCTRL)); 1227 1228 cdns_writel(cdns, dpn_hctrl_off, dpn_hctrl); 1229 cdns_writel(cdns, dpn_samplectrl_off, (t_params->sample_interval - 1)); 1230 1231 return 0; 1232 } 1233 1234 static int cdns_port_enable(struct sdw_bus *bus, 1235 struct sdw_enable_ch *enable_ch, unsigned int bank) 1236 { 1237 struct sdw_cdns *cdns = bus_to_cdns(bus); 1238 int dpn_chnen_off, ch_mask; 1239 1240 if (bank) 1241 dpn_chnen_off = CDNS_DPN_B1_CH_EN(enable_ch->port_num); 1242 else 1243 dpn_chnen_off = CDNS_DPN_B0_CH_EN(enable_ch->port_num); 1244 1245 ch_mask = enable_ch->ch_mask * enable_ch->enable; 1246 cdns_writel(cdns, dpn_chnen_off, ch_mask); 1247 1248 return 0; 1249 } 1250 1251 static const struct sdw_master_port_ops cdns_port_ops = { 1252 .dpn_set_port_params = cdns_port_params, 1253 .dpn_set_port_transport_params = cdns_transport_params, 1254 .dpn_port_enable_ch = cdns_port_enable, 1255 }; 1256 1257 /** 1258 * sdw_cdns_is_clock_stop: Check clock status 1259 * 1260 * @cdns: Cadence instance 1261 */ 1262 bool sdw_cdns_is_clock_stop(struct sdw_cdns *cdns) 1263 { 1264 return !!(cdns_readl(cdns, CDNS_MCP_STAT) & CDNS_MCP_STAT_CLK_STOP); 1265 } 1266 EXPORT_SYMBOL(sdw_cdns_is_clock_stop); 1267 1268 /** 1269 * sdw_cdns_clock_stop: Cadence clock stop configuration routine 1270 * 1271 * @cdns: Cadence instance 1272 * @block_wake: prevent wakes if required by the platform 1273 */ 1274 int sdw_cdns_clock_stop(struct sdw_cdns *cdns, bool block_wake) 1275 { 1276 bool slave_present = false; 1277 struct sdw_slave *slave; 1278 int ret; 1279 1280 /* Check suspend status */ 1281 if (sdw_cdns_is_clock_stop(cdns)) { 1282 dev_dbg(cdns->dev, "Clock is already stopped\n"); 1283 return 0; 1284 } 1285 1286 /* 1287 * Before entering clock stop we mask the Slave 1288 * interrupts. This helps avoid having to deal with e.g. a 1289 * Slave becoming UNATTACHED while the clock is being stopped 1290 */ 1291 cdns_enable_slave_interrupts(cdns, false); 1292 1293 /* 1294 * For specific platforms, it is required to be able to put 1295 * master into a state in which it ignores wake-up trials 1296 * in clock stop state 1297 */ 1298 if (block_wake) 1299 cdns_updatel(cdns, CDNS_MCP_CONTROL, 1300 CDNS_MCP_CONTROL_BLOCK_WAKEUP, 1301 CDNS_MCP_CONTROL_BLOCK_WAKEUP); 1302 1303 list_for_each_entry(slave, &cdns->bus.slaves, node) { 1304 if (slave->status == SDW_SLAVE_ATTACHED || 1305 slave->status == SDW_SLAVE_ALERT) { 1306 slave_present = true; 1307 break; 1308 } 1309 } 1310 1311 /* 1312 * This CMD_ACCEPT should be used when there are no devices 1313 * attached on the link when entering clock stop mode. If this is 1314 * not set and there is a broadcast write then the command ignored 1315 * will be treated as a failure 1316 */ 1317 if (!slave_present) 1318 cdns_updatel(cdns, CDNS_MCP_CONTROL, 1319 CDNS_MCP_CONTROL_CMD_ACCEPT, 1320 CDNS_MCP_CONTROL_CMD_ACCEPT); 1321 else 1322 cdns_updatel(cdns, CDNS_MCP_CONTROL, 1323 CDNS_MCP_CONTROL_CMD_ACCEPT, 0); 1324 1325 /* commit changes */ 1326 ret = cdns_config_update(cdns); 1327 if (ret < 0) { 1328 dev_err(cdns->dev, "%s: config_update failed\n", __func__); 1329 return ret; 1330 } 1331 1332 /* Prepare slaves for clock stop */ 1333 ret = sdw_bus_prep_clk_stop(&cdns->bus); 1334 if (ret < 0) { 1335 dev_err(cdns->dev, "prepare clock stop failed %d", ret); 1336 return ret; 1337 } 1338 1339 /* 1340 * Enter clock stop mode and only report errors if there are 1341 * Slave devices present (ALERT or ATTACHED) 1342 */ 1343 ret = sdw_bus_clk_stop(&cdns->bus); 1344 if (ret < 0 && slave_present && ret != -ENODATA) { 1345 dev_err(cdns->dev, "bus clock stop failed %d", ret); 1346 return ret; 1347 } 1348 1349 ret = cdns_set_wait(cdns, CDNS_MCP_STAT, 1350 CDNS_MCP_STAT_CLK_STOP, 1351 CDNS_MCP_STAT_CLK_STOP); 1352 if (ret < 0) 1353 dev_err(cdns->dev, "Clock stop failed %d\n", ret); 1354 1355 return ret; 1356 } 1357 EXPORT_SYMBOL(sdw_cdns_clock_stop); 1358 1359 /** 1360 * sdw_cdns_clock_restart: Cadence PM clock restart configuration routine 1361 * 1362 * @cdns: Cadence instance 1363 * @bus_reset: context may be lost while in low power modes and the bus 1364 * may require a Severe Reset and re-enumeration after a wake. 1365 */ 1366 int sdw_cdns_clock_restart(struct sdw_cdns *cdns, bool bus_reset) 1367 { 1368 int ret; 1369 1370 /* unmask Slave interrupts that were masked when stopping the clock */ 1371 cdns_enable_slave_interrupts(cdns, true); 1372 1373 ret = cdns_clear_bit(cdns, CDNS_MCP_CONTROL, 1374 CDNS_MCP_CONTROL_CLK_STOP_CLR); 1375 if (ret < 0) { 1376 dev_err(cdns->dev, "Couldn't exit from clock stop\n"); 1377 return ret; 1378 } 1379 1380 ret = cdns_set_wait(cdns, CDNS_MCP_STAT, CDNS_MCP_STAT_CLK_STOP, 0); 1381 if (ret < 0) { 1382 dev_err(cdns->dev, "clock stop exit failed %d\n", ret); 1383 return ret; 1384 } 1385 1386 cdns_updatel(cdns, CDNS_MCP_CONTROL, 1387 CDNS_MCP_CONTROL_BLOCK_WAKEUP, 0); 1388 1389 /* 1390 * clear CMD_ACCEPT so that the command ignored 1391 * will be treated as a failure during a broadcast write 1392 */ 1393 cdns_updatel(cdns, CDNS_MCP_CONTROL, CDNS_MCP_CONTROL_CMD_ACCEPT, 0); 1394 1395 if (!bus_reset) { 1396 1397 /* enable bus operations with clock and data */ 1398 cdns_updatel(cdns, CDNS_MCP_CONFIG, 1399 CDNS_MCP_CONFIG_OP, 1400 CDNS_MCP_CONFIG_OP_NORMAL); 1401 1402 ret = cdns_config_update(cdns); 1403 if (ret < 0) { 1404 dev_err(cdns->dev, "%s: config_update failed\n", __func__); 1405 return ret; 1406 } 1407 1408 ret = sdw_bus_exit_clk_stop(&cdns->bus); 1409 if (ret < 0) 1410 dev_err(cdns->dev, "bus failed to exit clock stop %d\n", ret); 1411 } 1412 1413 return ret; 1414 } 1415 EXPORT_SYMBOL(sdw_cdns_clock_restart); 1416 1417 /** 1418 * sdw_cdns_probe() - Cadence probe routine 1419 * @cdns: Cadence instance 1420 */ 1421 int sdw_cdns_probe(struct sdw_cdns *cdns) 1422 { 1423 init_completion(&cdns->tx_complete); 1424 cdns->bus.port_ops = &cdns_port_ops; 1425 1426 return 0; 1427 } 1428 EXPORT_SYMBOL(sdw_cdns_probe); 1429 1430 int cdns_set_sdw_stream(struct snd_soc_dai *dai, 1431 void *stream, bool pcm, int direction) 1432 { 1433 struct sdw_cdns *cdns = snd_soc_dai_get_drvdata(dai); 1434 struct sdw_cdns_dma_data *dma; 1435 1436 dma = kzalloc(sizeof(*dma), GFP_KERNEL); 1437 if (!dma) 1438 return -ENOMEM; 1439 1440 if (pcm) 1441 dma->stream_type = SDW_STREAM_PCM; 1442 else 1443 dma->stream_type = SDW_STREAM_PDM; 1444 1445 dma->bus = &cdns->bus; 1446 dma->link_id = cdns->instance; 1447 1448 dma->stream = stream; 1449 1450 if (direction == SNDRV_PCM_STREAM_PLAYBACK) 1451 dai->playback_dma_data = dma; 1452 else 1453 dai->capture_dma_data = dma; 1454 1455 return 0; 1456 } 1457 EXPORT_SYMBOL(cdns_set_sdw_stream); 1458 1459 /** 1460 * cdns_find_pdi() - Find a free PDI 1461 * 1462 * @cdns: Cadence instance 1463 * @offset: Starting offset 1464 * @num: Number of PDIs 1465 * @pdi: PDI instances 1466 * @dai_id: DAI id 1467 * 1468 * Find a PDI for a given PDI array. The PDI num and dai_id are 1469 * expected to match, return NULL otherwise. 1470 */ 1471 static struct sdw_cdns_pdi *cdns_find_pdi(struct sdw_cdns *cdns, 1472 unsigned int offset, 1473 unsigned int num, 1474 struct sdw_cdns_pdi *pdi, 1475 int dai_id) 1476 { 1477 int i; 1478 1479 for (i = offset; i < offset + num; i++) 1480 if (pdi[i].num == dai_id) 1481 return &pdi[i]; 1482 1483 return NULL; 1484 } 1485 1486 /** 1487 * sdw_cdns_config_stream: Configure a stream 1488 * 1489 * @cdns: Cadence instance 1490 * @ch: Channel count 1491 * @dir: Data direction 1492 * @pdi: PDI to be used 1493 */ 1494 void sdw_cdns_config_stream(struct sdw_cdns *cdns, 1495 u32 ch, u32 dir, struct sdw_cdns_pdi *pdi) 1496 { 1497 u32 offset, val = 0; 1498 1499 if (dir == SDW_DATA_DIR_RX) 1500 val = CDNS_PORTCTRL_DIRN; 1501 1502 offset = CDNS_PORTCTRL + pdi->num * CDNS_PORT_OFFSET; 1503 cdns_updatel(cdns, offset, CDNS_PORTCTRL_DIRN, val); 1504 1505 val = pdi->num; 1506 val |= CDNS_PDI_CONFIG_SOFT_RESET; 1507 val |= ((1 << ch) - 1) << SDW_REG_SHIFT(CDNS_PDI_CONFIG_CHANNEL); 1508 cdns_writel(cdns, CDNS_PDI_CONFIG(pdi->num), val); 1509 } 1510 EXPORT_SYMBOL(sdw_cdns_config_stream); 1511 1512 /** 1513 * sdw_cdns_alloc_pdi() - Allocate a PDI 1514 * 1515 * @cdns: Cadence instance 1516 * @stream: Stream to be allocated 1517 * @ch: Channel count 1518 * @dir: Data direction 1519 * @dai_id: DAI id 1520 */ 1521 struct sdw_cdns_pdi *sdw_cdns_alloc_pdi(struct sdw_cdns *cdns, 1522 struct sdw_cdns_streams *stream, 1523 u32 ch, u32 dir, int dai_id) 1524 { 1525 struct sdw_cdns_pdi *pdi = NULL; 1526 1527 if (dir == SDW_DATA_DIR_RX) 1528 pdi = cdns_find_pdi(cdns, 0, stream->num_in, stream->in, 1529 dai_id); 1530 else 1531 pdi = cdns_find_pdi(cdns, 0, stream->num_out, stream->out, 1532 dai_id); 1533 1534 /* check if we found a PDI, else find in bi-directional */ 1535 if (!pdi) 1536 pdi = cdns_find_pdi(cdns, 2, stream->num_bd, stream->bd, 1537 dai_id); 1538 1539 if (pdi) { 1540 pdi->l_ch_num = 0; 1541 pdi->h_ch_num = ch - 1; 1542 pdi->dir = dir; 1543 pdi->ch_count = ch; 1544 } 1545 1546 return pdi; 1547 } 1548 EXPORT_SYMBOL(sdw_cdns_alloc_pdi); 1549 1550 MODULE_LICENSE("Dual BSD/GPL"); 1551 MODULE_DESCRIPTION("Cadence Soundwire Library"); 1552