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/pm_runtime.h> 17 #include <linux/soundwire/sdw_registers.h> 18 #include <linux/soundwire/sdw.h> 19 #include <sound/pcm_params.h> 20 #include <sound/soc.h> 21 #include <linux/workqueue.h> 22 #include "bus.h" 23 #include "cadence_master.h" 24 25 static int interrupt_mask; 26 module_param_named(cnds_mcp_int_mask, interrupt_mask, int, 0444); 27 MODULE_PARM_DESC(cdns_mcp_int_mask, "Cadence MCP IntMask"); 28 29 #define CDNS_MCP_CONFIG 0x0 30 31 #define CDNS_MCP_CONFIG_MCMD_RETRY GENMASK(27, 24) 32 #define CDNS_MCP_CONFIG_MPREQ_DELAY GENMASK(20, 16) 33 #define CDNS_MCP_CONFIG_MMASTER BIT(7) 34 #define CDNS_MCP_CONFIG_BUS_REL BIT(6) 35 #define CDNS_MCP_CONFIG_SNIFFER BIT(5) 36 #define CDNS_MCP_CONFIG_SSPMOD BIT(4) 37 #define CDNS_MCP_CONFIG_CMD BIT(3) 38 #define CDNS_MCP_CONFIG_OP GENMASK(2, 0) 39 #define CDNS_MCP_CONFIG_OP_NORMAL 0 40 41 #define CDNS_MCP_CONTROL 0x4 42 43 #define CDNS_MCP_CONTROL_RST_DELAY GENMASK(10, 8) 44 #define CDNS_MCP_CONTROL_CMD_RST BIT(7) 45 #define CDNS_MCP_CONTROL_SOFT_RST BIT(6) 46 #define CDNS_MCP_CONTROL_SW_RST BIT(5) 47 #define CDNS_MCP_CONTROL_HW_RST BIT(4) 48 #define CDNS_MCP_CONTROL_CLK_PAUSE BIT(3) 49 #define CDNS_MCP_CONTROL_CLK_STOP_CLR BIT(2) 50 #define CDNS_MCP_CONTROL_CMD_ACCEPT BIT(1) 51 #define CDNS_MCP_CONTROL_BLOCK_WAKEUP BIT(0) 52 53 #define CDNS_MCP_CMDCTRL 0x8 54 55 #define CDNS_MCP_CMDCTRL_INSERT_PARITY_ERR BIT(2) 56 57 #define CDNS_MCP_SSPSTAT 0xC 58 #define CDNS_MCP_FRAME_SHAPE 0x10 59 #define CDNS_MCP_FRAME_SHAPE_INIT 0x14 60 #define CDNS_MCP_FRAME_SHAPE_COL_MASK GENMASK(2, 0) 61 #define CDNS_MCP_FRAME_SHAPE_ROW_MASK GENMASK(7, 3) 62 63 #define CDNS_MCP_CONFIG_UPDATE 0x18 64 #define CDNS_MCP_CONFIG_UPDATE_BIT BIT(0) 65 66 #define CDNS_MCP_PHYCTRL 0x1C 67 #define CDNS_MCP_SSP_CTRL0 0x20 68 #define CDNS_MCP_SSP_CTRL1 0x28 69 #define CDNS_MCP_CLK_CTRL0 0x30 70 #define CDNS_MCP_CLK_CTRL1 0x38 71 #define CDNS_MCP_CLK_MCLKD_MASK GENMASK(7, 0) 72 73 #define CDNS_MCP_STAT 0x40 74 75 #define CDNS_MCP_STAT_ACTIVE_BANK BIT(20) 76 #define CDNS_MCP_STAT_CLK_STOP BIT(16) 77 78 #define CDNS_MCP_INTSTAT 0x44 79 #define CDNS_MCP_INTMASK 0x48 80 81 #define CDNS_MCP_INT_IRQ BIT(31) 82 #define CDNS_MCP_INT_RESERVED1 GENMASK(30, 17) 83 #define CDNS_MCP_INT_WAKEUP BIT(16) 84 #define CDNS_MCP_INT_SLAVE_RSVD BIT(15) 85 #define CDNS_MCP_INT_SLAVE_ALERT BIT(14) 86 #define CDNS_MCP_INT_SLAVE_ATTACH BIT(13) 87 #define CDNS_MCP_INT_SLAVE_NATTACH BIT(12) 88 #define CDNS_MCP_INT_SLAVE_MASK GENMASK(15, 12) 89 #define CDNS_MCP_INT_DPINT BIT(11) 90 #define CDNS_MCP_INT_CTRL_CLASH BIT(10) 91 #define CDNS_MCP_INT_DATA_CLASH BIT(9) 92 #define CDNS_MCP_INT_PARITY BIT(8) 93 #define CDNS_MCP_INT_CMD_ERR BIT(7) 94 #define CDNS_MCP_INT_RESERVED2 GENMASK(6, 4) 95 #define CDNS_MCP_INT_RX_NE BIT(3) 96 #define CDNS_MCP_INT_RX_WL BIT(2) 97 #define CDNS_MCP_INT_TXE BIT(1) 98 #define CDNS_MCP_INT_TXF BIT(0) 99 #define CDNS_MCP_INT_RESERVED (CDNS_MCP_INT_RESERVED1 | CDNS_MCP_INT_RESERVED2) 100 101 #define CDNS_MCP_INTSET 0x4C 102 103 #define CDNS_MCP_SLAVE_STAT 0x50 104 #define CDNS_MCP_SLAVE_STAT_MASK GENMASK(1, 0) 105 106 #define CDNS_MCP_SLAVE_INTSTAT0 0x54 107 #define CDNS_MCP_SLAVE_INTSTAT1 0x58 108 #define CDNS_MCP_SLAVE_INTSTAT_NPRESENT BIT(0) 109 #define CDNS_MCP_SLAVE_INTSTAT_ATTACHED BIT(1) 110 #define CDNS_MCP_SLAVE_INTSTAT_ALERT BIT(2) 111 #define CDNS_MCP_SLAVE_INTSTAT_RESERVED BIT(3) 112 #define CDNS_MCP_SLAVE_STATUS_BITS GENMASK(3, 0) 113 #define CDNS_MCP_SLAVE_STATUS_NUM 4 114 115 #define CDNS_MCP_SLAVE_INTMASK0 0x5C 116 #define CDNS_MCP_SLAVE_INTMASK1 0x60 117 118 #define CDNS_MCP_SLAVE_INTMASK0_MASK GENMASK(31, 0) 119 #define CDNS_MCP_SLAVE_INTMASK1_MASK GENMASK(15, 0) 120 121 #define CDNS_MCP_PORT_INTSTAT 0x64 122 #define CDNS_MCP_PDI_STAT 0x6C 123 124 #define CDNS_MCP_FIFOLEVEL 0x78 125 #define CDNS_MCP_FIFOSTAT 0x7C 126 #define CDNS_MCP_RX_FIFO_AVAIL GENMASK(5, 0) 127 128 #define CDNS_MCP_CMD_BASE 0x80 129 #define CDNS_MCP_RESP_BASE 0x80 130 #define CDNS_MCP_CMD_LEN 0x20 131 #define CDNS_MCP_CMD_WORD_LEN 0x4 132 133 #define CDNS_MCP_CMD_SSP_TAG BIT(31) 134 #define CDNS_MCP_CMD_COMMAND GENMASK(30, 28) 135 #define CDNS_MCP_CMD_DEV_ADDR GENMASK(27, 24) 136 #define CDNS_MCP_CMD_REG_ADDR GENMASK(23, 8) 137 #define CDNS_MCP_CMD_REG_DATA GENMASK(7, 0) 138 139 #define CDNS_MCP_CMD_READ 2 140 #define CDNS_MCP_CMD_WRITE 3 141 142 #define CDNS_MCP_RESP_RDATA GENMASK(15, 8) 143 #define CDNS_MCP_RESP_ACK BIT(0) 144 #define CDNS_MCP_RESP_NACK BIT(1) 145 146 #define CDNS_DP_SIZE 128 147 148 #define CDNS_DPN_B0_CONFIG(n) (0x100 + CDNS_DP_SIZE * (n)) 149 #define CDNS_DPN_B0_CH_EN(n) (0x104 + CDNS_DP_SIZE * (n)) 150 #define CDNS_DPN_B0_SAMPLE_CTRL(n) (0x108 + CDNS_DP_SIZE * (n)) 151 #define CDNS_DPN_B0_OFFSET_CTRL(n) (0x10C + CDNS_DP_SIZE * (n)) 152 #define CDNS_DPN_B0_HCTRL(n) (0x110 + CDNS_DP_SIZE * (n)) 153 #define CDNS_DPN_B0_ASYNC_CTRL(n) (0x114 + CDNS_DP_SIZE * (n)) 154 155 #define CDNS_DPN_B1_CONFIG(n) (0x118 + CDNS_DP_SIZE * (n)) 156 #define CDNS_DPN_B1_CH_EN(n) (0x11C + CDNS_DP_SIZE * (n)) 157 #define CDNS_DPN_B1_SAMPLE_CTRL(n) (0x120 + CDNS_DP_SIZE * (n)) 158 #define CDNS_DPN_B1_OFFSET_CTRL(n) (0x124 + CDNS_DP_SIZE * (n)) 159 #define CDNS_DPN_B1_HCTRL(n) (0x128 + CDNS_DP_SIZE * (n)) 160 #define CDNS_DPN_B1_ASYNC_CTRL(n) (0x12C + CDNS_DP_SIZE * (n)) 161 162 #define CDNS_DPN_CONFIG_BPM BIT(18) 163 #define CDNS_DPN_CONFIG_BGC GENMASK(17, 16) 164 #define CDNS_DPN_CONFIG_WL GENMASK(12, 8) 165 #define CDNS_DPN_CONFIG_PORT_DAT GENMASK(3, 2) 166 #define CDNS_DPN_CONFIG_PORT_FLOW GENMASK(1, 0) 167 168 #define CDNS_DPN_SAMPLE_CTRL_SI GENMASK(15, 0) 169 170 #define CDNS_DPN_OFFSET_CTRL_1 GENMASK(7, 0) 171 #define CDNS_DPN_OFFSET_CTRL_2 GENMASK(15, 8) 172 173 #define CDNS_DPN_HCTRL_HSTOP GENMASK(3, 0) 174 #define CDNS_DPN_HCTRL_HSTART GENMASK(7, 4) 175 #define CDNS_DPN_HCTRL_LCTRL GENMASK(10, 8) 176 177 #define CDNS_PORTCTRL 0x130 178 #define CDNS_PORTCTRL_TEST_FAILED BIT(1) 179 #define CDNS_PORTCTRL_DIRN BIT(7) 180 #define CDNS_PORTCTRL_BANK_INVERT BIT(8) 181 182 #define CDNS_PORT_OFFSET 0x80 183 184 #define CDNS_PDI_CONFIG(n) (0x1100 + (n) * 16) 185 186 #define CDNS_PDI_CONFIG_SOFT_RESET BIT(24) 187 #define CDNS_PDI_CONFIG_CHANNEL GENMASK(15, 8) 188 #define CDNS_PDI_CONFIG_PORT GENMASK(4, 0) 189 190 /* Driver defaults */ 191 #define CDNS_TX_TIMEOUT 500 192 193 #define CDNS_SCP_RX_FIFOLEVEL 0x2 194 195 /* 196 * register accessor helpers 197 */ 198 static inline u32 cdns_readl(struct sdw_cdns *cdns, int offset) 199 { 200 return readl(cdns->registers + offset); 201 } 202 203 static inline void cdns_writel(struct sdw_cdns *cdns, int offset, u32 value) 204 { 205 writel(value, cdns->registers + offset); 206 } 207 208 static inline void cdns_updatel(struct sdw_cdns *cdns, 209 int offset, u32 mask, u32 val) 210 { 211 u32 tmp; 212 213 tmp = cdns_readl(cdns, offset); 214 tmp = (tmp & ~mask) | val; 215 cdns_writel(cdns, offset, tmp); 216 } 217 218 static int cdns_set_wait(struct sdw_cdns *cdns, int offset, u32 mask, u32 value) 219 { 220 int timeout = 10; 221 u32 reg_read; 222 223 /* Wait for bit to be set */ 224 do { 225 reg_read = readl(cdns->registers + offset); 226 if ((reg_read & mask) == value) 227 return 0; 228 229 timeout--; 230 usleep_range(50, 100); 231 } while (timeout != 0); 232 233 return -ETIMEDOUT; 234 } 235 236 static int cdns_clear_bit(struct sdw_cdns *cdns, int offset, u32 value) 237 { 238 writel(value, cdns->registers + offset); 239 240 /* Wait for bit to be self cleared */ 241 return cdns_set_wait(cdns, offset, value, 0); 242 } 243 244 /* 245 * all changes to the MCP_CONFIG, MCP_CONTROL, MCP_CMDCTRL and MCP_PHYCTRL 246 * need to be confirmed with a write to MCP_CONFIG_UPDATE 247 */ 248 static int cdns_config_update(struct sdw_cdns *cdns) 249 { 250 int ret; 251 252 if (sdw_cdns_is_clock_stop(cdns)) { 253 dev_err(cdns->dev, "Cannot program MCP_CONFIG_UPDATE in ClockStopMode\n"); 254 return -EINVAL; 255 } 256 257 ret = cdns_clear_bit(cdns, CDNS_MCP_CONFIG_UPDATE, 258 CDNS_MCP_CONFIG_UPDATE_BIT); 259 if (ret < 0) 260 dev_err(cdns->dev, "Config update timedout\n"); 261 262 return ret; 263 } 264 265 /* 266 * debugfs 267 */ 268 #ifdef CONFIG_DEBUG_FS 269 270 #define RD_BUF (2 * PAGE_SIZE) 271 272 static ssize_t cdns_sprintf(struct sdw_cdns *cdns, 273 char *buf, size_t pos, unsigned int reg) 274 { 275 return scnprintf(buf + pos, RD_BUF - pos, 276 "%4x\t%8x\n", reg, cdns_readl(cdns, reg)); 277 } 278 279 static int cdns_reg_show(struct seq_file *s, void *data) 280 { 281 struct sdw_cdns *cdns = s->private; 282 char *buf; 283 ssize_t ret; 284 int num_ports; 285 int i, j; 286 287 buf = kzalloc(RD_BUF, GFP_KERNEL); 288 if (!buf) 289 return -ENOMEM; 290 291 ret = scnprintf(buf, RD_BUF, "Register Value\n"); 292 ret += scnprintf(buf + ret, RD_BUF - ret, "\nMCP Registers\n"); 293 /* 8 MCP registers */ 294 for (i = CDNS_MCP_CONFIG; i <= CDNS_MCP_PHYCTRL; i += sizeof(u32)) 295 ret += cdns_sprintf(cdns, buf, ret, i); 296 297 ret += scnprintf(buf + ret, RD_BUF - ret, 298 "\nStatus & Intr Registers\n"); 299 /* 13 Status & Intr registers (offsets 0x70 and 0x74 not defined) */ 300 for (i = CDNS_MCP_STAT; i <= CDNS_MCP_FIFOSTAT; i += sizeof(u32)) 301 ret += cdns_sprintf(cdns, buf, ret, i); 302 303 ret += scnprintf(buf + ret, RD_BUF - ret, 304 "\nSSP & Clk ctrl Registers\n"); 305 ret += cdns_sprintf(cdns, buf, ret, CDNS_MCP_SSP_CTRL0); 306 ret += cdns_sprintf(cdns, buf, ret, CDNS_MCP_SSP_CTRL1); 307 ret += cdns_sprintf(cdns, buf, ret, CDNS_MCP_CLK_CTRL0); 308 ret += cdns_sprintf(cdns, buf, ret, CDNS_MCP_CLK_CTRL1); 309 310 ret += scnprintf(buf + ret, RD_BUF - ret, 311 "\nDPn B0 Registers\n"); 312 313 num_ports = cdns->num_ports; 314 315 for (i = 0; i < num_ports; i++) { 316 ret += scnprintf(buf + ret, RD_BUF - ret, 317 "\nDP-%d\n", i); 318 for (j = CDNS_DPN_B0_CONFIG(i); 319 j < CDNS_DPN_B0_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 B1 Registers\n"); 325 for (i = 0; i < num_ports; i++) { 326 ret += scnprintf(buf + ret, RD_BUF - ret, 327 "\nDP-%d\n", i); 328 329 for (j = CDNS_DPN_B1_CONFIG(i); 330 j < CDNS_DPN_B1_ASYNC_CTRL(i); j += sizeof(u32)) 331 ret += cdns_sprintf(cdns, buf, ret, j); 332 } 333 334 ret += scnprintf(buf + ret, RD_BUF - ret, 335 "\nDPn Control Registers\n"); 336 for (i = 0; i < num_ports; i++) 337 ret += cdns_sprintf(cdns, buf, ret, 338 CDNS_PORTCTRL + i * CDNS_PORT_OFFSET); 339 340 ret += scnprintf(buf + ret, RD_BUF - ret, 341 "\nPDIn Config Registers\n"); 342 343 /* number of PDI and ports is interchangeable */ 344 for (i = 0; i < num_ports; i++) 345 ret += cdns_sprintf(cdns, buf, ret, CDNS_PDI_CONFIG(i)); 346 347 seq_printf(s, "%s", buf); 348 kfree(buf); 349 350 return 0; 351 } 352 DEFINE_SHOW_ATTRIBUTE(cdns_reg); 353 354 static int cdns_hw_reset(void *data, u64 value) 355 { 356 struct sdw_cdns *cdns = data; 357 int ret; 358 359 if (value != 1) 360 return -EINVAL; 361 362 /* Userspace changed the hardware state behind the kernel's back */ 363 add_taint(TAINT_USER, LOCKDEP_STILL_OK); 364 365 ret = sdw_cdns_exit_reset(cdns); 366 367 dev_dbg(cdns->dev, "link hw_reset done: %d\n", ret); 368 369 return ret; 370 } 371 372 DEFINE_DEBUGFS_ATTRIBUTE(cdns_hw_reset_fops, NULL, cdns_hw_reset, "%llu\n"); 373 374 static int cdns_parity_error_injection(void *data, u64 value) 375 { 376 struct sdw_cdns *cdns = data; 377 struct sdw_bus *bus; 378 int ret; 379 380 if (value != 1) 381 return -EINVAL; 382 383 bus = &cdns->bus; 384 385 /* 386 * Resume Master device. If this results in a bus reset, the 387 * Slave devices will re-attach and be re-enumerated. 388 */ 389 ret = pm_runtime_get_sync(bus->dev); 390 if (ret < 0 && ret != -EACCES) { 391 dev_err_ratelimited(cdns->dev, 392 "pm_runtime_get_sync failed in %s, ret %d\n", 393 __func__, ret); 394 pm_runtime_put_noidle(bus->dev); 395 return ret; 396 } 397 398 /* 399 * wait long enough for Slave(s) to be in steady state. This 400 * does not need to be super precise. 401 */ 402 msleep(200); 403 404 /* 405 * Take the bus lock here to make sure that any bus transactions 406 * will be queued while we inject a parity error on a dummy read 407 */ 408 mutex_lock(&bus->bus_lock); 409 410 /* program hardware to inject parity error */ 411 cdns_updatel(cdns, CDNS_MCP_CMDCTRL, 412 CDNS_MCP_CMDCTRL_INSERT_PARITY_ERR, 413 CDNS_MCP_CMDCTRL_INSERT_PARITY_ERR); 414 415 /* commit changes */ 416 cdns_updatel(cdns, CDNS_MCP_CONFIG_UPDATE, 417 CDNS_MCP_CONFIG_UPDATE_BIT, 418 CDNS_MCP_CONFIG_UPDATE_BIT); 419 420 /* do a broadcast dummy read to avoid bus clashes */ 421 ret = sdw_bread_no_pm_unlocked(&cdns->bus, 0xf, SDW_SCP_DEVID_0); 422 dev_info(cdns->dev, "parity error injection, read: %d\n", ret); 423 424 /* program hardware to disable parity error */ 425 cdns_updatel(cdns, CDNS_MCP_CMDCTRL, 426 CDNS_MCP_CMDCTRL_INSERT_PARITY_ERR, 427 0); 428 429 /* commit changes */ 430 cdns_updatel(cdns, CDNS_MCP_CONFIG_UPDATE, 431 CDNS_MCP_CONFIG_UPDATE_BIT, 432 CDNS_MCP_CONFIG_UPDATE_BIT); 433 434 /* Continue bus operation with parity error injection disabled */ 435 mutex_unlock(&bus->bus_lock); 436 437 /* Userspace changed the hardware state behind the kernel's back */ 438 add_taint(TAINT_USER, LOCKDEP_STILL_OK); 439 440 /* 441 * allow Master device to enter pm_runtime suspend. This may 442 * also result in Slave devices suspending. 443 */ 444 pm_runtime_mark_last_busy(bus->dev); 445 pm_runtime_put_autosuspend(bus->dev); 446 447 return 0; 448 } 449 450 DEFINE_DEBUGFS_ATTRIBUTE(cdns_parity_error_fops, NULL, 451 cdns_parity_error_injection, "%llu\n"); 452 453 static int cdns_set_pdi_loopback_source(void *data, u64 value) 454 { 455 struct sdw_cdns *cdns = data; 456 unsigned int pdi_out_num = cdns->pcm.num_bd + cdns->pcm.num_out; 457 458 if (value > pdi_out_num) 459 return -EINVAL; 460 461 /* Userspace changed the hardware state behind the kernel's back */ 462 add_taint(TAINT_USER, LOCKDEP_STILL_OK); 463 464 cdns->pdi_loopback_source = value; 465 466 return 0; 467 } 468 DEFINE_DEBUGFS_ATTRIBUTE(cdns_pdi_loopback_source_fops, NULL, cdns_set_pdi_loopback_source, "%llu\n"); 469 470 static int cdns_set_pdi_loopback_target(void *data, u64 value) 471 { 472 struct sdw_cdns *cdns = data; 473 unsigned int pdi_in_num = cdns->pcm.num_bd + cdns->pcm.num_in; 474 475 if (value > pdi_in_num) 476 return -EINVAL; 477 478 /* Userspace changed the hardware state behind the kernel's back */ 479 add_taint(TAINT_USER, LOCKDEP_STILL_OK); 480 481 cdns->pdi_loopback_target = value; 482 483 return 0; 484 } 485 DEFINE_DEBUGFS_ATTRIBUTE(cdns_pdi_loopback_target_fops, NULL, cdns_set_pdi_loopback_target, "%llu\n"); 486 487 /** 488 * sdw_cdns_debugfs_init() - Cadence debugfs init 489 * @cdns: Cadence instance 490 * @root: debugfs root 491 */ 492 void sdw_cdns_debugfs_init(struct sdw_cdns *cdns, struct dentry *root) 493 { 494 debugfs_create_file("cdns-registers", 0400, root, cdns, &cdns_reg_fops); 495 496 debugfs_create_file("cdns-hw-reset", 0200, root, cdns, 497 &cdns_hw_reset_fops); 498 499 debugfs_create_file("cdns-parity-error-injection", 0200, root, cdns, 500 &cdns_parity_error_fops); 501 502 cdns->pdi_loopback_source = -1; 503 cdns->pdi_loopback_target = -1; 504 505 debugfs_create_file("cdns-pdi-loopback-source", 0200, root, cdns, 506 &cdns_pdi_loopback_source_fops); 507 508 debugfs_create_file("cdns-pdi-loopback-target", 0200, root, cdns, 509 &cdns_pdi_loopback_target_fops); 510 511 } 512 EXPORT_SYMBOL_GPL(sdw_cdns_debugfs_init); 513 514 #endif /* CONFIG_DEBUG_FS */ 515 516 /* 517 * IO Calls 518 */ 519 static enum sdw_command_response 520 cdns_fill_msg_resp(struct sdw_cdns *cdns, 521 struct sdw_msg *msg, int count, int offset) 522 { 523 int nack = 0, no_ack = 0; 524 int i; 525 526 /* check message response */ 527 for (i = 0; i < count; i++) { 528 if (!(cdns->response_buf[i] & CDNS_MCP_RESP_ACK)) { 529 no_ack = 1; 530 dev_vdbg(cdns->dev, "Msg Ack not received, cmd %d\n", i); 531 } 532 if (cdns->response_buf[i] & CDNS_MCP_RESP_NACK) { 533 nack = 1; 534 dev_err_ratelimited(cdns->dev, "Msg NACK received, cmd %d\n", i); 535 } 536 } 537 538 if (nack) { 539 dev_err_ratelimited(cdns->dev, "Msg NACKed for Slave %d\n", msg->dev_num); 540 return SDW_CMD_FAIL; 541 } 542 543 if (no_ack) { 544 dev_dbg_ratelimited(cdns->dev, "Msg ignored for Slave %d\n", msg->dev_num); 545 return SDW_CMD_IGNORED; 546 } 547 548 /* fill response */ 549 for (i = 0; i < count; i++) 550 msg->buf[i + offset] = FIELD_GET(CDNS_MCP_RESP_RDATA, cdns->response_buf[i]); 551 552 return SDW_CMD_OK; 553 } 554 555 static enum sdw_command_response 556 _cdns_xfer_msg(struct sdw_cdns *cdns, struct sdw_msg *msg, int cmd, 557 int offset, int count, bool defer) 558 { 559 unsigned long time; 560 u32 base, i, data; 561 u16 addr; 562 563 /* Program the watermark level for RX FIFO */ 564 if (cdns->msg_count != count) { 565 cdns_writel(cdns, CDNS_MCP_FIFOLEVEL, count); 566 cdns->msg_count = count; 567 } 568 569 base = CDNS_MCP_CMD_BASE; 570 addr = msg->addr; 571 572 for (i = 0; i < count; i++) { 573 data = FIELD_PREP(CDNS_MCP_CMD_DEV_ADDR, msg->dev_num); 574 data |= FIELD_PREP(CDNS_MCP_CMD_COMMAND, cmd); 575 data |= FIELD_PREP(CDNS_MCP_CMD_REG_ADDR, addr); 576 addr++; 577 578 if (msg->flags == SDW_MSG_FLAG_WRITE) 579 data |= msg->buf[i + offset]; 580 581 data |= FIELD_PREP(CDNS_MCP_CMD_SSP_TAG, msg->ssp_sync); 582 cdns_writel(cdns, base, data); 583 base += CDNS_MCP_CMD_WORD_LEN; 584 } 585 586 if (defer) 587 return SDW_CMD_OK; 588 589 /* wait for timeout or response */ 590 time = wait_for_completion_timeout(&cdns->tx_complete, 591 msecs_to_jiffies(CDNS_TX_TIMEOUT)); 592 if (!time) { 593 dev_err(cdns->dev, "IO transfer timed out, cmd %d device %d addr %x len %d\n", 594 cmd, msg->dev_num, msg->addr, msg->len); 595 msg->len = 0; 596 return SDW_CMD_TIMEOUT; 597 } 598 599 return cdns_fill_msg_resp(cdns, msg, count, offset); 600 } 601 602 static enum sdw_command_response 603 cdns_program_scp_addr(struct sdw_cdns *cdns, struct sdw_msg *msg) 604 { 605 int nack = 0, no_ack = 0; 606 unsigned long time; 607 u32 data[2], base; 608 int i; 609 610 /* Program the watermark level for RX FIFO */ 611 if (cdns->msg_count != CDNS_SCP_RX_FIFOLEVEL) { 612 cdns_writel(cdns, CDNS_MCP_FIFOLEVEL, CDNS_SCP_RX_FIFOLEVEL); 613 cdns->msg_count = CDNS_SCP_RX_FIFOLEVEL; 614 } 615 616 data[0] = FIELD_PREP(CDNS_MCP_CMD_DEV_ADDR, msg->dev_num); 617 data[0] |= FIELD_PREP(CDNS_MCP_CMD_COMMAND, 0x3); 618 data[1] = data[0]; 619 620 data[0] |= FIELD_PREP(CDNS_MCP_CMD_REG_ADDR, SDW_SCP_ADDRPAGE1); 621 data[1] |= FIELD_PREP(CDNS_MCP_CMD_REG_ADDR, SDW_SCP_ADDRPAGE2); 622 623 data[0] |= msg->addr_page1; 624 data[1] |= msg->addr_page2; 625 626 base = CDNS_MCP_CMD_BASE; 627 cdns_writel(cdns, base, data[0]); 628 base += CDNS_MCP_CMD_WORD_LEN; 629 cdns_writel(cdns, base, data[1]); 630 631 time = wait_for_completion_timeout(&cdns->tx_complete, 632 msecs_to_jiffies(CDNS_TX_TIMEOUT)); 633 if (!time) { 634 dev_err(cdns->dev, "SCP Msg trf timed out\n"); 635 msg->len = 0; 636 return SDW_CMD_TIMEOUT; 637 } 638 639 /* check response the writes */ 640 for (i = 0; i < 2; i++) { 641 if (!(cdns->response_buf[i] & CDNS_MCP_RESP_ACK)) { 642 no_ack = 1; 643 dev_err(cdns->dev, "Program SCP Ack not received\n"); 644 if (cdns->response_buf[i] & CDNS_MCP_RESP_NACK) { 645 nack = 1; 646 dev_err(cdns->dev, "Program SCP NACK received\n"); 647 } 648 } 649 } 650 651 /* For NACK, NO ack, don't return err if we are in Broadcast mode */ 652 if (nack) { 653 dev_err_ratelimited(cdns->dev, 654 "SCP_addrpage NACKed for Slave %d\n", msg->dev_num); 655 return SDW_CMD_FAIL; 656 } 657 658 if (no_ack) { 659 dev_dbg_ratelimited(cdns->dev, 660 "SCP_addrpage ignored for Slave %d\n", msg->dev_num); 661 return SDW_CMD_IGNORED; 662 } 663 664 return SDW_CMD_OK; 665 } 666 667 static int cdns_prep_msg(struct sdw_cdns *cdns, struct sdw_msg *msg, int *cmd) 668 { 669 int ret; 670 671 if (msg->page) { 672 ret = cdns_program_scp_addr(cdns, msg); 673 if (ret) { 674 msg->len = 0; 675 return ret; 676 } 677 } 678 679 switch (msg->flags) { 680 case SDW_MSG_FLAG_READ: 681 *cmd = CDNS_MCP_CMD_READ; 682 break; 683 684 case SDW_MSG_FLAG_WRITE: 685 *cmd = CDNS_MCP_CMD_WRITE; 686 break; 687 688 default: 689 dev_err(cdns->dev, "Invalid msg cmd: %d\n", msg->flags); 690 return -EINVAL; 691 } 692 693 return 0; 694 } 695 696 enum sdw_command_response 697 cdns_xfer_msg(struct sdw_bus *bus, struct sdw_msg *msg) 698 { 699 struct sdw_cdns *cdns = bus_to_cdns(bus); 700 int cmd = 0, ret, i; 701 702 ret = cdns_prep_msg(cdns, msg, &cmd); 703 if (ret) 704 return SDW_CMD_FAIL_OTHER; 705 706 for (i = 0; i < msg->len / CDNS_MCP_CMD_LEN; i++) { 707 ret = _cdns_xfer_msg(cdns, msg, cmd, i * CDNS_MCP_CMD_LEN, 708 CDNS_MCP_CMD_LEN, false); 709 if (ret < 0) 710 goto exit; 711 } 712 713 if (!(msg->len % CDNS_MCP_CMD_LEN)) 714 goto exit; 715 716 ret = _cdns_xfer_msg(cdns, msg, cmd, i * CDNS_MCP_CMD_LEN, 717 msg->len % CDNS_MCP_CMD_LEN, false); 718 719 exit: 720 return ret; 721 } 722 EXPORT_SYMBOL(cdns_xfer_msg); 723 724 enum sdw_command_response 725 cdns_xfer_msg_defer(struct sdw_bus *bus, 726 struct sdw_msg *msg, struct sdw_defer *defer) 727 { 728 struct sdw_cdns *cdns = bus_to_cdns(bus); 729 int cmd = 0, ret; 730 731 /* for defer only 1 message is supported */ 732 if (msg->len > 1) 733 return -ENOTSUPP; 734 735 ret = cdns_prep_msg(cdns, msg, &cmd); 736 if (ret) 737 return SDW_CMD_FAIL_OTHER; 738 739 cdns->defer = defer; 740 cdns->defer->length = msg->len; 741 742 return _cdns_xfer_msg(cdns, msg, cmd, 0, msg->len, true); 743 } 744 EXPORT_SYMBOL(cdns_xfer_msg_defer); 745 746 enum sdw_command_response 747 cdns_reset_page_addr(struct sdw_bus *bus, unsigned int dev_num) 748 { 749 struct sdw_cdns *cdns = bus_to_cdns(bus); 750 struct sdw_msg msg; 751 752 /* Create dummy message with valid device number */ 753 memset(&msg, 0, sizeof(msg)); 754 msg.dev_num = dev_num; 755 756 return cdns_program_scp_addr(cdns, &msg); 757 } 758 EXPORT_SYMBOL(cdns_reset_page_addr); 759 760 /* 761 * IRQ handling 762 */ 763 764 static void cdns_read_response(struct sdw_cdns *cdns) 765 { 766 u32 num_resp, cmd_base; 767 int i; 768 769 num_resp = cdns_readl(cdns, CDNS_MCP_FIFOSTAT); 770 num_resp &= CDNS_MCP_RX_FIFO_AVAIL; 771 772 cmd_base = CDNS_MCP_CMD_BASE; 773 774 for (i = 0; i < num_resp; i++) { 775 cdns->response_buf[i] = cdns_readl(cdns, cmd_base); 776 cmd_base += CDNS_MCP_CMD_WORD_LEN; 777 } 778 } 779 780 static int cdns_update_slave_status(struct sdw_cdns *cdns, 781 u64 slave_intstat) 782 { 783 enum sdw_slave_status status[SDW_MAX_DEVICES + 1]; 784 bool is_slave = false; 785 u32 mask; 786 int i, set_status; 787 788 memset(status, 0, sizeof(status)); 789 790 for (i = 0; i <= SDW_MAX_DEVICES; i++) { 791 mask = (slave_intstat >> (i * CDNS_MCP_SLAVE_STATUS_NUM)) & 792 CDNS_MCP_SLAVE_STATUS_BITS; 793 if (!mask) 794 continue; 795 796 is_slave = true; 797 set_status = 0; 798 799 if (mask & CDNS_MCP_SLAVE_INTSTAT_RESERVED) { 800 status[i] = SDW_SLAVE_RESERVED; 801 set_status++; 802 } 803 804 if (mask & CDNS_MCP_SLAVE_INTSTAT_ATTACHED) { 805 status[i] = SDW_SLAVE_ATTACHED; 806 set_status++; 807 } 808 809 if (mask & CDNS_MCP_SLAVE_INTSTAT_ALERT) { 810 status[i] = SDW_SLAVE_ALERT; 811 set_status++; 812 } 813 814 if (mask & CDNS_MCP_SLAVE_INTSTAT_NPRESENT) { 815 status[i] = SDW_SLAVE_UNATTACHED; 816 set_status++; 817 } 818 819 /* first check if Slave reported multiple status */ 820 if (set_status > 1) { 821 u32 val; 822 823 dev_warn_ratelimited(cdns->dev, 824 "Slave %d reported multiple Status: %d\n", 825 i, mask); 826 827 /* check latest status extracted from PING commands */ 828 val = cdns_readl(cdns, CDNS_MCP_SLAVE_STAT); 829 val >>= (i * 2); 830 831 switch (val & 0x3) { 832 case 0: 833 status[i] = SDW_SLAVE_UNATTACHED; 834 break; 835 case 1: 836 status[i] = SDW_SLAVE_ATTACHED; 837 break; 838 case 2: 839 status[i] = SDW_SLAVE_ALERT; 840 break; 841 case 3: 842 default: 843 status[i] = SDW_SLAVE_RESERVED; 844 break; 845 } 846 847 dev_warn_ratelimited(cdns->dev, 848 "Slave %d status updated to %d\n", 849 i, status[i]); 850 851 } 852 } 853 854 if (is_slave) 855 return sdw_handle_slave_status(&cdns->bus, status); 856 857 return 0; 858 } 859 860 /** 861 * sdw_cdns_irq() - Cadence interrupt handler 862 * @irq: irq number 863 * @dev_id: irq context 864 */ 865 irqreturn_t sdw_cdns_irq(int irq, void *dev_id) 866 { 867 struct sdw_cdns *cdns = dev_id; 868 u32 int_status; 869 870 /* Check if the link is up */ 871 if (!cdns->link_up) 872 return IRQ_NONE; 873 874 int_status = cdns_readl(cdns, CDNS_MCP_INTSTAT); 875 876 /* check for reserved values read as zero */ 877 if (int_status & CDNS_MCP_INT_RESERVED) 878 return IRQ_NONE; 879 880 if (!(int_status & CDNS_MCP_INT_IRQ)) 881 return IRQ_NONE; 882 883 if (int_status & CDNS_MCP_INT_RX_WL) { 884 cdns_read_response(cdns); 885 886 if (cdns->defer) { 887 cdns_fill_msg_resp(cdns, cdns->defer->msg, 888 cdns->defer->length, 0); 889 complete(&cdns->defer->complete); 890 cdns->defer = NULL; 891 } else { 892 complete(&cdns->tx_complete); 893 } 894 } 895 896 if (int_status & CDNS_MCP_INT_PARITY) { 897 /* Parity error detected by Master */ 898 dev_err_ratelimited(cdns->dev, "Parity error\n"); 899 } 900 901 if (int_status & CDNS_MCP_INT_CTRL_CLASH) { 902 /* Slave is driving bit slot during control word */ 903 dev_err_ratelimited(cdns->dev, "Bus clash for control word\n"); 904 } 905 906 if (int_status & CDNS_MCP_INT_DATA_CLASH) { 907 /* 908 * Multiple slaves trying to drive bit slot, or issue with 909 * ownership of data bits or Slave gone bonkers 910 */ 911 dev_err_ratelimited(cdns->dev, "Bus clash for data word\n"); 912 } 913 914 if (cdns->bus.params.m_data_mode != SDW_PORT_DATA_MODE_NORMAL && 915 int_status & CDNS_MCP_INT_DPINT) { 916 u32 port_intstat; 917 918 /* just log which ports report an error */ 919 port_intstat = cdns_readl(cdns, CDNS_MCP_PORT_INTSTAT); 920 dev_err_ratelimited(cdns->dev, "DP interrupt: PortIntStat %8x\n", 921 port_intstat); 922 923 /* clear status w/ write1 */ 924 cdns_writel(cdns, CDNS_MCP_PORT_INTSTAT, port_intstat); 925 } 926 927 if (int_status & CDNS_MCP_INT_SLAVE_MASK) { 928 /* Mask the Slave interrupt and wake thread */ 929 cdns_updatel(cdns, CDNS_MCP_INTMASK, 930 CDNS_MCP_INT_SLAVE_MASK, 0); 931 932 int_status &= ~CDNS_MCP_INT_SLAVE_MASK; 933 934 /* 935 * Deal with possible race condition between interrupt 936 * handling and disabling interrupts on suspend. 937 * 938 * If the master is in the process of disabling 939 * interrupts, don't schedule a workqueue 940 */ 941 if (cdns->interrupt_enabled) 942 schedule_work(&cdns->work); 943 } 944 945 cdns_writel(cdns, CDNS_MCP_INTSTAT, int_status); 946 return IRQ_HANDLED; 947 } 948 EXPORT_SYMBOL(sdw_cdns_irq); 949 950 /** 951 * cdns_update_slave_status_work - update slave status in a work since we will need to handle 952 * other interrupts eg. CDNS_MCP_INT_RX_WL during the update slave 953 * process. 954 * @work: cdns worker thread 955 */ 956 static void cdns_update_slave_status_work(struct work_struct *work) 957 { 958 struct sdw_cdns *cdns = 959 container_of(work, struct sdw_cdns, work); 960 u32 slave0, slave1; 961 u64 slave_intstat; 962 963 slave0 = cdns_readl(cdns, CDNS_MCP_SLAVE_INTSTAT0); 964 slave1 = cdns_readl(cdns, CDNS_MCP_SLAVE_INTSTAT1); 965 966 /* combine the two status */ 967 slave_intstat = ((u64)slave1 << 32) | slave0; 968 969 dev_dbg_ratelimited(cdns->dev, "Slave status change: 0x%llx\n", slave_intstat); 970 971 cdns_update_slave_status(cdns, slave_intstat); 972 cdns_writel(cdns, CDNS_MCP_SLAVE_INTSTAT0, slave0); 973 cdns_writel(cdns, CDNS_MCP_SLAVE_INTSTAT1, slave1); 974 975 /* clear and unmask Slave interrupt now */ 976 cdns_writel(cdns, CDNS_MCP_INTSTAT, CDNS_MCP_INT_SLAVE_MASK); 977 cdns_updatel(cdns, CDNS_MCP_INTMASK, 978 CDNS_MCP_INT_SLAVE_MASK, CDNS_MCP_INT_SLAVE_MASK); 979 980 } 981 982 /* paranoia check to make sure self-cleared bits are indeed cleared */ 983 void sdw_cdns_check_self_clearing_bits(struct sdw_cdns *cdns, const char *string, 984 bool initial_delay, int reset_iterations) 985 { 986 u32 mcp_control; 987 u32 mcp_config_update; 988 int i; 989 990 if (initial_delay) 991 usleep_range(1000, 1500); 992 993 mcp_control = cdns_readl(cdns, CDNS_MCP_CONTROL); 994 995 /* the following bits should be cleared immediately */ 996 if (mcp_control & CDNS_MCP_CONTROL_CMD_RST) 997 dev_err(cdns->dev, "%s failed: MCP_CONTROL_CMD_RST is not cleared\n", string); 998 if (mcp_control & CDNS_MCP_CONTROL_SOFT_RST) 999 dev_err(cdns->dev, "%s failed: MCP_CONTROL_SOFT_RST is not cleared\n", string); 1000 if (mcp_control & CDNS_MCP_CONTROL_SW_RST) 1001 dev_err(cdns->dev, "%s failed: MCP_CONTROL_SW_RST is not cleared\n", string); 1002 if (mcp_control & CDNS_MCP_CONTROL_CLK_STOP_CLR) 1003 dev_err(cdns->dev, "%s failed: MCP_CONTROL_CLK_STOP_CLR is not cleared\n", string); 1004 mcp_config_update = cdns_readl(cdns, CDNS_MCP_CONFIG_UPDATE); 1005 if (mcp_config_update & CDNS_MCP_CONFIG_UPDATE_BIT) 1006 dev_err(cdns->dev, "%s failed: MCP_CONFIG_UPDATE_BIT is not cleared\n", string); 1007 1008 i = 0; 1009 while (mcp_control & CDNS_MCP_CONTROL_HW_RST) { 1010 if (i == reset_iterations) { 1011 dev_err(cdns->dev, "%s failed: MCP_CONTROL_HW_RST is not cleared\n", string); 1012 break; 1013 } 1014 1015 dev_dbg(cdns->dev, "%s: MCP_CONTROL_HW_RST is not cleared at iteration %d\n", string, i); 1016 i++; 1017 1018 usleep_range(1000, 1500); 1019 mcp_control = cdns_readl(cdns, CDNS_MCP_CONTROL); 1020 } 1021 1022 } 1023 EXPORT_SYMBOL(sdw_cdns_check_self_clearing_bits); 1024 1025 /* 1026 * init routines 1027 */ 1028 1029 /** 1030 * sdw_cdns_exit_reset() - Program reset parameters and start bus operations 1031 * @cdns: Cadence instance 1032 */ 1033 int sdw_cdns_exit_reset(struct sdw_cdns *cdns) 1034 { 1035 /* keep reset delay unchanged to 4096 cycles */ 1036 1037 /* use hardware generated reset */ 1038 cdns_updatel(cdns, CDNS_MCP_CONTROL, 1039 CDNS_MCP_CONTROL_HW_RST, 1040 CDNS_MCP_CONTROL_HW_RST); 1041 1042 /* commit changes */ 1043 cdns_updatel(cdns, CDNS_MCP_CONFIG_UPDATE, 1044 CDNS_MCP_CONFIG_UPDATE_BIT, 1045 CDNS_MCP_CONFIG_UPDATE_BIT); 1046 1047 /* don't wait here */ 1048 return 0; 1049 1050 } 1051 EXPORT_SYMBOL(sdw_cdns_exit_reset); 1052 1053 /** 1054 * cdns_enable_slave_interrupts() - Enable SDW slave interrupts 1055 * @cdns: Cadence instance 1056 * @state: boolean for true/false 1057 */ 1058 static void cdns_enable_slave_interrupts(struct sdw_cdns *cdns, bool state) 1059 { 1060 u32 mask; 1061 1062 mask = cdns_readl(cdns, CDNS_MCP_INTMASK); 1063 if (state) 1064 mask |= CDNS_MCP_INT_SLAVE_MASK; 1065 else 1066 mask &= ~CDNS_MCP_INT_SLAVE_MASK; 1067 1068 cdns_writel(cdns, CDNS_MCP_INTMASK, mask); 1069 } 1070 1071 /** 1072 * sdw_cdns_enable_interrupt() - Enable SDW interrupts 1073 * @cdns: Cadence instance 1074 * @state: True if we are trying to enable interrupt. 1075 */ 1076 int sdw_cdns_enable_interrupt(struct sdw_cdns *cdns, bool state) 1077 { 1078 u32 slave_intmask0 = 0; 1079 u32 slave_intmask1 = 0; 1080 u32 mask = 0; 1081 1082 if (!state) 1083 goto update_masks; 1084 1085 slave_intmask0 = CDNS_MCP_SLAVE_INTMASK0_MASK; 1086 slave_intmask1 = CDNS_MCP_SLAVE_INTMASK1_MASK; 1087 1088 /* enable detection of all slave state changes */ 1089 mask = CDNS_MCP_INT_SLAVE_MASK; 1090 1091 /* enable detection of bus issues */ 1092 mask |= CDNS_MCP_INT_CTRL_CLASH | CDNS_MCP_INT_DATA_CLASH | 1093 CDNS_MCP_INT_PARITY; 1094 1095 /* port interrupt limited to test modes for now */ 1096 if (cdns->bus.params.m_data_mode != SDW_PORT_DATA_MODE_NORMAL) 1097 mask |= CDNS_MCP_INT_DPINT; 1098 1099 /* enable detection of RX fifo level */ 1100 mask |= CDNS_MCP_INT_RX_WL; 1101 1102 /* 1103 * CDNS_MCP_INT_IRQ needs to be set otherwise all previous 1104 * settings are irrelevant 1105 */ 1106 mask |= CDNS_MCP_INT_IRQ; 1107 1108 if (interrupt_mask) /* parameter override */ 1109 mask = interrupt_mask; 1110 1111 update_masks: 1112 /* clear slave interrupt status before enabling interrupt */ 1113 if (state) { 1114 u32 slave_state; 1115 1116 slave_state = cdns_readl(cdns, CDNS_MCP_SLAVE_INTSTAT0); 1117 cdns_writel(cdns, CDNS_MCP_SLAVE_INTSTAT0, slave_state); 1118 slave_state = cdns_readl(cdns, CDNS_MCP_SLAVE_INTSTAT1); 1119 cdns_writel(cdns, CDNS_MCP_SLAVE_INTSTAT1, slave_state); 1120 } 1121 cdns->interrupt_enabled = state; 1122 1123 /* 1124 * Complete any on-going status updates before updating masks, 1125 * and cancel queued status updates. 1126 * 1127 * There could be a race with a new interrupt thrown before 1128 * the 3 mask updates below are complete, so in the interrupt 1129 * we use the 'interrupt_enabled' status to prevent new work 1130 * from being queued. 1131 */ 1132 if (!state) 1133 cancel_work_sync(&cdns->work); 1134 1135 cdns_writel(cdns, CDNS_MCP_SLAVE_INTMASK0, slave_intmask0); 1136 cdns_writel(cdns, CDNS_MCP_SLAVE_INTMASK1, slave_intmask1); 1137 cdns_writel(cdns, CDNS_MCP_INTMASK, mask); 1138 1139 return 0; 1140 } 1141 EXPORT_SYMBOL(sdw_cdns_enable_interrupt); 1142 1143 static int cdns_allocate_pdi(struct sdw_cdns *cdns, 1144 struct sdw_cdns_pdi **stream, 1145 u32 num, u32 pdi_offset) 1146 { 1147 struct sdw_cdns_pdi *pdi; 1148 int i; 1149 1150 if (!num) 1151 return 0; 1152 1153 pdi = devm_kcalloc(cdns->dev, num, sizeof(*pdi), GFP_KERNEL); 1154 if (!pdi) 1155 return -ENOMEM; 1156 1157 for (i = 0; i < num; i++) { 1158 pdi[i].num = i + pdi_offset; 1159 } 1160 1161 *stream = pdi; 1162 return 0; 1163 } 1164 1165 /** 1166 * sdw_cdns_pdi_init() - PDI initialization routine 1167 * 1168 * @cdns: Cadence instance 1169 * @config: Stream configurations 1170 */ 1171 int sdw_cdns_pdi_init(struct sdw_cdns *cdns, 1172 struct sdw_cdns_stream_config config) 1173 { 1174 struct sdw_cdns_streams *stream; 1175 int offset; 1176 int ret; 1177 1178 cdns->pcm.num_bd = config.pcm_bd; 1179 cdns->pcm.num_in = config.pcm_in; 1180 cdns->pcm.num_out = config.pcm_out; 1181 cdns->pdm.num_bd = config.pdm_bd; 1182 cdns->pdm.num_in = config.pdm_in; 1183 cdns->pdm.num_out = config.pdm_out; 1184 1185 /* Allocate PDIs for PCMs */ 1186 stream = &cdns->pcm; 1187 1188 /* we allocate PDI0 and PDI1 which are used for Bulk */ 1189 offset = 0; 1190 1191 ret = cdns_allocate_pdi(cdns, &stream->bd, 1192 stream->num_bd, offset); 1193 if (ret) 1194 return ret; 1195 1196 offset += stream->num_bd; 1197 1198 ret = cdns_allocate_pdi(cdns, &stream->in, 1199 stream->num_in, offset); 1200 if (ret) 1201 return ret; 1202 1203 offset += stream->num_in; 1204 1205 ret = cdns_allocate_pdi(cdns, &stream->out, 1206 stream->num_out, offset); 1207 if (ret) 1208 return ret; 1209 1210 /* Update total number of PCM PDIs */ 1211 stream->num_pdi = stream->num_bd + stream->num_in + stream->num_out; 1212 cdns->num_ports = stream->num_pdi; 1213 1214 /* Allocate PDIs for PDMs */ 1215 stream = &cdns->pdm; 1216 ret = cdns_allocate_pdi(cdns, &stream->bd, 1217 stream->num_bd, offset); 1218 if (ret) 1219 return ret; 1220 1221 offset += stream->num_bd; 1222 1223 ret = cdns_allocate_pdi(cdns, &stream->in, 1224 stream->num_in, offset); 1225 if (ret) 1226 return ret; 1227 1228 offset += stream->num_in; 1229 1230 ret = cdns_allocate_pdi(cdns, &stream->out, 1231 stream->num_out, offset); 1232 1233 if (ret) 1234 return ret; 1235 1236 /* Update total number of PDM PDIs */ 1237 stream->num_pdi = stream->num_bd + stream->num_in + stream->num_out; 1238 cdns->num_ports += stream->num_pdi; 1239 1240 return 0; 1241 } 1242 EXPORT_SYMBOL(sdw_cdns_pdi_init); 1243 1244 static u32 cdns_set_initial_frame_shape(int n_rows, int n_cols) 1245 { 1246 u32 val; 1247 int c; 1248 int r; 1249 1250 r = sdw_find_row_index(n_rows); 1251 c = sdw_find_col_index(n_cols); 1252 1253 val = FIELD_PREP(CDNS_MCP_FRAME_SHAPE_ROW_MASK, r); 1254 val |= FIELD_PREP(CDNS_MCP_FRAME_SHAPE_COL_MASK, c); 1255 1256 return val; 1257 } 1258 1259 static void cdns_init_clock_ctrl(struct sdw_cdns *cdns) 1260 { 1261 struct sdw_bus *bus = &cdns->bus; 1262 struct sdw_master_prop *prop = &bus->prop; 1263 u32 val; 1264 u32 ssp_interval; 1265 int divider; 1266 1267 /* Set clock divider */ 1268 divider = (prop->mclk_freq / prop->max_clk_freq) - 1; 1269 1270 cdns_updatel(cdns, CDNS_MCP_CLK_CTRL0, 1271 CDNS_MCP_CLK_MCLKD_MASK, divider); 1272 cdns_updatel(cdns, CDNS_MCP_CLK_CTRL1, 1273 CDNS_MCP_CLK_MCLKD_MASK, divider); 1274 1275 /* 1276 * Frame shape changes after initialization have to be done 1277 * with the bank switch mechanism 1278 */ 1279 val = cdns_set_initial_frame_shape(prop->default_row, 1280 prop->default_col); 1281 cdns_writel(cdns, CDNS_MCP_FRAME_SHAPE_INIT, val); 1282 1283 /* Set SSP interval to default value */ 1284 ssp_interval = prop->default_frame_rate / SDW_CADENCE_GSYNC_HZ; 1285 cdns_writel(cdns, CDNS_MCP_SSP_CTRL0, ssp_interval); 1286 cdns_writel(cdns, CDNS_MCP_SSP_CTRL1, ssp_interval); 1287 } 1288 1289 /** 1290 * sdw_cdns_init() - Cadence initialization 1291 * @cdns: Cadence instance 1292 */ 1293 int sdw_cdns_init(struct sdw_cdns *cdns) 1294 { 1295 u32 val; 1296 1297 cdns_init_clock_ctrl(cdns); 1298 1299 sdw_cdns_check_self_clearing_bits(cdns, __func__, false, 0); 1300 1301 /* reset msg_count to default value of FIFOLEVEL */ 1302 cdns->msg_count = cdns_readl(cdns, CDNS_MCP_FIFOLEVEL); 1303 1304 /* flush command FIFOs */ 1305 cdns_updatel(cdns, CDNS_MCP_CONTROL, CDNS_MCP_CONTROL_CMD_RST, 1306 CDNS_MCP_CONTROL_CMD_RST); 1307 1308 /* Set cmd accept mode */ 1309 cdns_updatel(cdns, CDNS_MCP_CONTROL, CDNS_MCP_CONTROL_CMD_ACCEPT, 1310 CDNS_MCP_CONTROL_CMD_ACCEPT); 1311 1312 /* Configure mcp config */ 1313 val = cdns_readl(cdns, CDNS_MCP_CONFIG); 1314 1315 /* enable bus operations with clock and data */ 1316 val &= ~CDNS_MCP_CONFIG_OP; 1317 val |= CDNS_MCP_CONFIG_OP_NORMAL; 1318 1319 /* Set cmd mode for Tx and Rx cmds */ 1320 val &= ~CDNS_MCP_CONFIG_CMD; 1321 1322 /* Disable sniffer mode */ 1323 val &= ~CDNS_MCP_CONFIG_SNIFFER; 1324 1325 /* Disable auto bus release */ 1326 val &= ~CDNS_MCP_CONFIG_BUS_REL; 1327 1328 if (cdns->bus.multi_link) 1329 /* Set Multi-master mode to take gsync into account */ 1330 val |= CDNS_MCP_CONFIG_MMASTER; 1331 1332 /* leave frame delay to hardware default of 0x1F */ 1333 1334 /* leave command retry to hardware default of 0 */ 1335 1336 cdns_writel(cdns, CDNS_MCP_CONFIG, val); 1337 1338 /* changes will be committed later */ 1339 return 0; 1340 } 1341 EXPORT_SYMBOL(sdw_cdns_init); 1342 1343 int cdns_bus_conf(struct sdw_bus *bus, struct sdw_bus_params *params) 1344 { 1345 struct sdw_master_prop *prop = &bus->prop; 1346 struct sdw_cdns *cdns = bus_to_cdns(bus); 1347 int mcp_clkctrl_off; 1348 int divider; 1349 1350 if (!params->curr_dr_freq) { 1351 dev_err(cdns->dev, "NULL curr_dr_freq\n"); 1352 return -EINVAL; 1353 } 1354 1355 divider = prop->mclk_freq * SDW_DOUBLE_RATE_FACTOR / 1356 params->curr_dr_freq; 1357 divider--; /* divider is 1/(N+1) */ 1358 1359 if (params->next_bank) 1360 mcp_clkctrl_off = CDNS_MCP_CLK_CTRL1; 1361 else 1362 mcp_clkctrl_off = CDNS_MCP_CLK_CTRL0; 1363 1364 cdns_updatel(cdns, mcp_clkctrl_off, CDNS_MCP_CLK_MCLKD_MASK, divider); 1365 1366 return 0; 1367 } 1368 EXPORT_SYMBOL(cdns_bus_conf); 1369 1370 static int cdns_port_params(struct sdw_bus *bus, 1371 struct sdw_port_params *p_params, unsigned int bank) 1372 { 1373 struct sdw_cdns *cdns = bus_to_cdns(bus); 1374 int dpn_config_off_source; 1375 int dpn_config_off_target; 1376 int target_num = p_params->num; 1377 int source_num = p_params->num; 1378 bool override = false; 1379 int dpn_config; 1380 1381 if (target_num == cdns->pdi_loopback_target && 1382 cdns->pdi_loopback_source != -1) { 1383 source_num = cdns->pdi_loopback_source; 1384 override = true; 1385 } 1386 1387 if (bank) { 1388 dpn_config_off_source = CDNS_DPN_B1_CONFIG(source_num); 1389 dpn_config_off_target = CDNS_DPN_B1_CONFIG(target_num); 1390 } else { 1391 dpn_config_off_source = CDNS_DPN_B0_CONFIG(source_num); 1392 dpn_config_off_target = CDNS_DPN_B0_CONFIG(target_num); 1393 } 1394 1395 dpn_config = cdns_readl(cdns, dpn_config_off_source); 1396 1397 /* use port params if there is no loopback, otherwise use source as is */ 1398 if (!override) { 1399 u32p_replace_bits(&dpn_config, p_params->bps - 1, CDNS_DPN_CONFIG_WL); 1400 u32p_replace_bits(&dpn_config, p_params->flow_mode, CDNS_DPN_CONFIG_PORT_FLOW); 1401 u32p_replace_bits(&dpn_config, p_params->data_mode, CDNS_DPN_CONFIG_PORT_DAT); 1402 } 1403 1404 cdns_writel(cdns, dpn_config_off_target, dpn_config); 1405 1406 return 0; 1407 } 1408 1409 static int cdns_transport_params(struct sdw_bus *bus, 1410 struct sdw_transport_params *t_params, 1411 enum sdw_reg_bank bank) 1412 { 1413 struct sdw_cdns *cdns = bus_to_cdns(bus); 1414 int dpn_config; 1415 int dpn_config_off_source; 1416 int dpn_config_off_target; 1417 int dpn_hctrl; 1418 int dpn_hctrl_off_source; 1419 int dpn_hctrl_off_target; 1420 int dpn_offsetctrl; 1421 int dpn_offsetctrl_off_source; 1422 int dpn_offsetctrl_off_target; 1423 int dpn_samplectrl; 1424 int dpn_samplectrl_off_source; 1425 int dpn_samplectrl_off_target; 1426 int source_num = t_params->port_num; 1427 int target_num = t_params->port_num; 1428 bool override = false; 1429 1430 if (target_num == cdns->pdi_loopback_target && 1431 cdns->pdi_loopback_source != -1) { 1432 source_num = cdns->pdi_loopback_source; 1433 override = true; 1434 } 1435 1436 /* 1437 * Note: Only full data port is supported on the Master side for 1438 * both PCM and PDM ports. 1439 */ 1440 1441 if (bank) { 1442 dpn_config_off_source = CDNS_DPN_B1_CONFIG(source_num); 1443 dpn_hctrl_off_source = CDNS_DPN_B1_HCTRL(source_num); 1444 dpn_offsetctrl_off_source = CDNS_DPN_B1_OFFSET_CTRL(source_num); 1445 dpn_samplectrl_off_source = CDNS_DPN_B1_SAMPLE_CTRL(source_num); 1446 1447 dpn_config_off_target = CDNS_DPN_B1_CONFIG(target_num); 1448 dpn_hctrl_off_target = CDNS_DPN_B1_HCTRL(target_num); 1449 dpn_offsetctrl_off_target = CDNS_DPN_B1_OFFSET_CTRL(target_num); 1450 dpn_samplectrl_off_target = CDNS_DPN_B1_SAMPLE_CTRL(target_num); 1451 1452 } else { 1453 dpn_config_off_source = CDNS_DPN_B0_CONFIG(source_num); 1454 dpn_hctrl_off_source = CDNS_DPN_B0_HCTRL(source_num); 1455 dpn_offsetctrl_off_source = CDNS_DPN_B0_OFFSET_CTRL(source_num); 1456 dpn_samplectrl_off_source = CDNS_DPN_B0_SAMPLE_CTRL(source_num); 1457 1458 dpn_config_off_target = CDNS_DPN_B0_CONFIG(target_num); 1459 dpn_hctrl_off_target = CDNS_DPN_B0_HCTRL(target_num); 1460 dpn_offsetctrl_off_target = CDNS_DPN_B0_OFFSET_CTRL(target_num); 1461 dpn_samplectrl_off_target = CDNS_DPN_B0_SAMPLE_CTRL(target_num); 1462 } 1463 1464 dpn_config = cdns_readl(cdns, dpn_config_off_source); 1465 if (!override) { 1466 u32p_replace_bits(&dpn_config, t_params->blk_grp_ctrl, CDNS_DPN_CONFIG_BGC); 1467 u32p_replace_bits(&dpn_config, t_params->blk_pkg_mode, CDNS_DPN_CONFIG_BPM); 1468 } 1469 cdns_writel(cdns, dpn_config_off_target, dpn_config); 1470 1471 if (!override) { 1472 dpn_offsetctrl = 0; 1473 u32p_replace_bits(&dpn_offsetctrl, t_params->offset1, CDNS_DPN_OFFSET_CTRL_1); 1474 u32p_replace_bits(&dpn_offsetctrl, t_params->offset2, CDNS_DPN_OFFSET_CTRL_2); 1475 } else { 1476 dpn_offsetctrl = cdns_readl(cdns, dpn_offsetctrl_off_source); 1477 } 1478 cdns_writel(cdns, dpn_offsetctrl_off_target, dpn_offsetctrl); 1479 1480 if (!override) { 1481 dpn_hctrl = 0; 1482 u32p_replace_bits(&dpn_hctrl, t_params->hstart, CDNS_DPN_HCTRL_HSTART); 1483 u32p_replace_bits(&dpn_hctrl, t_params->hstop, CDNS_DPN_HCTRL_HSTOP); 1484 u32p_replace_bits(&dpn_hctrl, t_params->lane_ctrl, CDNS_DPN_HCTRL_LCTRL); 1485 } else { 1486 dpn_hctrl = cdns_readl(cdns, dpn_hctrl_off_source); 1487 } 1488 cdns_writel(cdns, dpn_hctrl_off_target, dpn_hctrl); 1489 1490 if (!override) 1491 dpn_samplectrl = t_params->sample_interval - 1; 1492 else 1493 dpn_samplectrl = cdns_readl(cdns, dpn_samplectrl_off_source); 1494 cdns_writel(cdns, dpn_samplectrl_off_target, dpn_samplectrl); 1495 1496 return 0; 1497 } 1498 1499 static int cdns_port_enable(struct sdw_bus *bus, 1500 struct sdw_enable_ch *enable_ch, unsigned int bank) 1501 { 1502 struct sdw_cdns *cdns = bus_to_cdns(bus); 1503 int dpn_chnen_off, ch_mask; 1504 1505 if (bank) 1506 dpn_chnen_off = CDNS_DPN_B1_CH_EN(enable_ch->port_num); 1507 else 1508 dpn_chnen_off = CDNS_DPN_B0_CH_EN(enable_ch->port_num); 1509 1510 ch_mask = enable_ch->ch_mask * enable_ch->enable; 1511 cdns_writel(cdns, dpn_chnen_off, ch_mask); 1512 1513 return 0; 1514 } 1515 1516 static const struct sdw_master_port_ops cdns_port_ops = { 1517 .dpn_set_port_params = cdns_port_params, 1518 .dpn_set_port_transport_params = cdns_transport_params, 1519 .dpn_port_enable_ch = cdns_port_enable, 1520 }; 1521 1522 /** 1523 * sdw_cdns_is_clock_stop: Check clock status 1524 * 1525 * @cdns: Cadence instance 1526 */ 1527 bool sdw_cdns_is_clock_stop(struct sdw_cdns *cdns) 1528 { 1529 return !!(cdns_readl(cdns, CDNS_MCP_STAT) & CDNS_MCP_STAT_CLK_STOP); 1530 } 1531 EXPORT_SYMBOL(sdw_cdns_is_clock_stop); 1532 1533 /** 1534 * sdw_cdns_clock_stop: Cadence clock stop configuration routine 1535 * 1536 * @cdns: Cadence instance 1537 * @block_wake: prevent wakes if required by the platform 1538 */ 1539 int sdw_cdns_clock_stop(struct sdw_cdns *cdns, bool block_wake) 1540 { 1541 bool slave_present = false; 1542 struct sdw_slave *slave; 1543 int ret; 1544 1545 sdw_cdns_check_self_clearing_bits(cdns, __func__, false, 0); 1546 1547 /* Check suspend status */ 1548 if (sdw_cdns_is_clock_stop(cdns)) { 1549 dev_dbg(cdns->dev, "Clock is already stopped\n"); 1550 return 0; 1551 } 1552 1553 /* 1554 * Before entering clock stop we mask the Slave 1555 * interrupts. This helps avoid having to deal with e.g. a 1556 * Slave becoming UNATTACHED while the clock is being stopped 1557 */ 1558 cdns_enable_slave_interrupts(cdns, false); 1559 1560 /* 1561 * For specific platforms, it is required to be able to put 1562 * master into a state in which it ignores wake-up trials 1563 * in clock stop state 1564 */ 1565 if (block_wake) 1566 cdns_updatel(cdns, CDNS_MCP_CONTROL, 1567 CDNS_MCP_CONTROL_BLOCK_WAKEUP, 1568 CDNS_MCP_CONTROL_BLOCK_WAKEUP); 1569 1570 list_for_each_entry(slave, &cdns->bus.slaves, node) { 1571 if (slave->status == SDW_SLAVE_ATTACHED || 1572 slave->status == SDW_SLAVE_ALERT) { 1573 slave_present = true; 1574 break; 1575 } 1576 } 1577 1578 /* commit changes */ 1579 ret = cdns_config_update(cdns); 1580 if (ret < 0) { 1581 dev_err(cdns->dev, "%s: config_update failed\n", __func__); 1582 return ret; 1583 } 1584 1585 /* Prepare slaves for clock stop */ 1586 if (slave_present) { 1587 ret = sdw_bus_prep_clk_stop(&cdns->bus); 1588 if (ret < 0 && ret != -ENODATA) { 1589 dev_err(cdns->dev, "prepare clock stop failed %d\n", ret); 1590 return ret; 1591 } 1592 } 1593 1594 /* 1595 * Enter clock stop mode and only report errors if there are 1596 * Slave devices present (ALERT or ATTACHED) 1597 */ 1598 ret = sdw_bus_clk_stop(&cdns->bus); 1599 if (ret < 0 && slave_present && ret != -ENODATA) { 1600 dev_err(cdns->dev, "bus clock stop failed %d\n", ret); 1601 return ret; 1602 } 1603 1604 ret = cdns_set_wait(cdns, CDNS_MCP_STAT, 1605 CDNS_MCP_STAT_CLK_STOP, 1606 CDNS_MCP_STAT_CLK_STOP); 1607 if (ret < 0) 1608 dev_err(cdns->dev, "Clock stop failed %d\n", ret); 1609 1610 return ret; 1611 } 1612 EXPORT_SYMBOL(sdw_cdns_clock_stop); 1613 1614 /** 1615 * sdw_cdns_clock_restart: Cadence PM clock restart configuration routine 1616 * 1617 * @cdns: Cadence instance 1618 * @bus_reset: context may be lost while in low power modes and the bus 1619 * may require a Severe Reset and re-enumeration after a wake. 1620 */ 1621 int sdw_cdns_clock_restart(struct sdw_cdns *cdns, bool bus_reset) 1622 { 1623 int ret; 1624 1625 /* unmask Slave interrupts that were masked when stopping the clock */ 1626 cdns_enable_slave_interrupts(cdns, true); 1627 1628 ret = cdns_clear_bit(cdns, CDNS_MCP_CONTROL, 1629 CDNS_MCP_CONTROL_CLK_STOP_CLR); 1630 if (ret < 0) { 1631 dev_err(cdns->dev, "Couldn't exit from clock stop\n"); 1632 return ret; 1633 } 1634 1635 ret = cdns_set_wait(cdns, CDNS_MCP_STAT, CDNS_MCP_STAT_CLK_STOP, 0); 1636 if (ret < 0) { 1637 dev_err(cdns->dev, "clock stop exit failed %d\n", ret); 1638 return ret; 1639 } 1640 1641 cdns_updatel(cdns, CDNS_MCP_CONTROL, 1642 CDNS_MCP_CONTROL_BLOCK_WAKEUP, 0); 1643 1644 cdns_updatel(cdns, CDNS_MCP_CONTROL, CDNS_MCP_CONTROL_CMD_ACCEPT, 1645 CDNS_MCP_CONTROL_CMD_ACCEPT); 1646 1647 if (!bus_reset) { 1648 1649 /* enable bus operations with clock and data */ 1650 cdns_updatel(cdns, CDNS_MCP_CONFIG, 1651 CDNS_MCP_CONFIG_OP, 1652 CDNS_MCP_CONFIG_OP_NORMAL); 1653 1654 ret = cdns_config_update(cdns); 1655 if (ret < 0) { 1656 dev_err(cdns->dev, "%s: config_update failed\n", __func__); 1657 return ret; 1658 } 1659 1660 ret = sdw_bus_exit_clk_stop(&cdns->bus); 1661 if (ret < 0) 1662 dev_err(cdns->dev, "bus failed to exit clock stop %d\n", ret); 1663 } 1664 1665 return ret; 1666 } 1667 EXPORT_SYMBOL(sdw_cdns_clock_restart); 1668 1669 /** 1670 * sdw_cdns_probe() - Cadence probe routine 1671 * @cdns: Cadence instance 1672 */ 1673 int sdw_cdns_probe(struct sdw_cdns *cdns) 1674 { 1675 init_completion(&cdns->tx_complete); 1676 cdns->bus.port_ops = &cdns_port_ops; 1677 1678 INIT_WORK(&cdns->work, cdns_update_slave_status_work); 1679 return 0; 1680 } 1681 EXPORT_SYMBOL(sdw_cdns_probe); 1682 1683 int cdns_set_sdw_stream(struct snd_soc_dai *dai, 1684 void *stream, bool pcm, int direction) 1685 { 1686 struct sdw_cdns *cdns = snd_soc_dai_get_drvdata(dai); 1687 struct sdw_cdns_dma_data *dma; 1688 1689 if (stream) { 1690 /* first paranoia check */ 1691 if (direction == SNDRV_PCM_STREAM_PLAYBACK) 1692 dma = dai->playback_dma_data; 1693 else 1694 dma = dai->capture_dma_data; 1695 1696 if (dma) { 1697 dev_err(dai->dev, 1698 "dma_data already allocated for dai %s\n", 1699 dai->name); 1700 return -EINVAL; 1701 } 1702 1703 /* allocate and set dma info */ 1704 dma = kzalloc(sizeof(*dma), GFP_KERNEL); 1705 if (!dma) 1706 return -ENOMEM; 1707 1708 if (pcm) 1709 dma->stream_type = SDW_STREAM_PCM; 1710 else 1711 dma->stream_type = SDW_STREAM_PDM; 1712 1713 dma->bus = &cdns->bus; 1714 dma->link_id = cdns->instance; 1715 1716 dma->stream = stream; 1717 1718 if (direction == SNDRV_PCM_STREAM_PLAYBACK) 1719 dai->playback_dma_data = dma; 1720 else 1721 dai->capture_dma_data = dma; 1722 } else { 1723 /* for NULL stream we release allocated dma_data */ 1724 if (direction == SNDRV_PCM_STREAM_PLAYBACK) { 1725 kfree(dai->playback_dma_data); 1726 dai->playback_dma_data = NULL; 1727 } else { 1728 kfree(dai->capture_dma_data); 1729 dai->capture_dma_data = NULL; 1730 } 1731 } 1732 return 0; 1733 } 1734 EXPORT_SYMBOL(cdns_set_sdw_stream); 1735 1736 /** 1737 * cdns_find_pdi() - Find a free PDI 1738 * 1739 * @cdns: Cadence instance 1740 * @offset: Starting offset 1741 * @num: Number of PDIs 1742 * @pdi: PDI instances 1743 * @dai_id: DAI id 1744 * 1745 * Find a PDI for a given PDI array. The PDI num and dai_id are 1746 * expected to match, return NULL otherwise. 1747 */ 1748 static struct sdw_cdns_pdi *cdns_find_pdi(struct sdw_cdns *cdns, 1749 unsigned int offset, 1750 unsigned int num, 1751 struct sdw_cdns_pdi *pdi, 1752 int dai_id) 1753 { 1754 int i; 1755 1756 for (i = offset; i < offset + num; i++) 1757 if (pdi[i].num == dai_id) 1758 return &pdi[i]; 1759 1760 return NULL; 1761 } 1762 1763 /** 1764 * sdw_cdns_config_stream: Configure a stream 1765 * 1766 * @cdns: Cadence instance 1767 * @ch: Channel count 1768 * @dir: Data direction 1769 * @pdi: PDI to be used 1770 */ 1771 void sdw_cdns_config_stream(struct sdw_cdns *cdns, 1772 u32 ch, u32 dir, struct sdw_cdns_pdi *pdi) 1773 { 1774 u32 offset, val = 0; 1775 1776 if (dir == SDW_DATA_DIR_RX) { 1777 val = CDNS_PORTCTRL_DIRN; 1778 1779 if (cdns->bus.params.m_data_mode != SDW_PORT_DATA_MODE_NORMAL) 1780 val |= CDNS_PORTCTRL_TEST_FAILED; 1781 } 1782 offset = CDNS_PORTCTRL + pdi->num * CDNS_PORT_OFFSET; 1783 cdns_updatel(cdns, offset, 1784 CDNS_PORTCTRL_DIRN | CDNS_PORTCTRL_TEST_FAILED, 1785 val); 1786 1787 val = pdi->num; 1788 val |= CDNS_PDI_CONFIG_SOFT_RESET; 1789 val |= FIELD_PREP(CDNS_PDI_CONFIG_CHANNEL, (1 << ch) - 1); 1790 cdns_writel(cdns, CDNS_PDI_CONFIG(pdi->num), val); 1791 } 1792 EXPORT_SYMBOL(sdw_cdns_config_stream); 1793 1794 /** 1795 * sdw_cdns_alloc_pdi() - Allocate a PDI 1796 * 1797 * @cdns: Cadence instance 1798 * @stream: Stream to be allocated 1799 * @ch: Channel count 1800 * @dir: Data direction 1801 * @dai_id: DAI id 1802 */ 1803 struct sdw_cdns_pdi *sdw_cdns_alloc_pdi(struct sdw_cdns *cdns, 1804 struct sdw_cdns_streams *stream, 1805 u32 ch, u32 dir, int dai_id) 1806 { 1807 struct sdw_cdns_pdi *pdi = NULL; 1808 1809 if (dir == SDW_DATA_DIR_RX) 1810 pdi = cdns_find_pdi(cdns, 0, stream->num_in, stream->in, 1811 dai_id); 1812 else 1813 pdi = cdns_find_pdi(cdns, 0, stream->num_out, stream->out, 1814 dai_id); 1815 1816 /* check if we found a PDI, else find in bi-directional */ 1817 if (!pdi) 1818 pdi = cdns_find_pdi(cdns, 2, stream->num_bd, stream->bd, 1819 dai_id); 1820 1821 if (pdi) { 1822 pdi->l_ch_num = 0; 1823 pdi->h_ch_num = ch - 1; 1824 pdi->dir = dir; 1825 pdi->ch_count = ch; 1826 } 1827 1828 return pdi; 1829 } 1830 EXPORT_SYMBOL(sdw_cdns_alloc_pdi); 1831 1832 MODULE_LICENSE("Dual BSD/GPL"); 1833 MODULE_DESCRIPTION("Cadence Soundwire Library"); 1834