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_resume_and_get(bus->dev); 390 if (ret < 0 && ret != -EACCES) { 391 dev_err_ratelimited(cdns->dev, 392 "pm_runtime_resume_and_get failed in %s, ret %d\n", 393 __func__, ret); 394 return ret; 395 } 396 397 /* 398 * wait long enough for Slave(s) to be in steady state. This 399 * does not need to be super precise. 400 */ 401 msleep(200); 402 403 /* 404 * Take the bus lock here to make sure that any bus transactions 405 * will be queued while we inject a parity error on a dummy read 406 */ 407 mutex_lock(&bus->bus_lock); 408 409 /* program hardware to inject parity error */ 410 cdns_updatel(cdns, CDNS_MCP_CMDCTRL, 411 CDNS_MCP_CMDCTRL_INSERT_PARITY_ERR, 412 CDNS_MCP_CMDCTRL_INSERT_PARITY_ERR); 413 414 /* commit changes */ 415 cdns_updatel(cdns, CDNS_MCP_CONFIG_UPDATE, 416 CDNS_MCP_CONFIG_UPDATE_BIT, 417 CDNS_MCP_CONFIG_UPDATE_BIT); 418 419 /* do a broadcast dummy read to avoid bus clashes */ 420 ret = sdw_bread_no_pm_unlocked(&cdns->bus, 0xf, SDW_SCP_DEVID_0); 421 dev_info(cdns->dev, "parity error injection, read: %d\n", ret); 422 423 /* program hardware to disable parity error */ 424 cdns_updatel(cdns, CDNS_MCP_CMDCTRL, 425 CDNS_MCP_CMDCTRL_INSERT_PARITY_ERR, 426 0); 427 428 /* commit changes */ 429 cdns_updatel(cdns, CDNS_MCP_CONFIG_UPDATE, 430 CDNS_MCP_CONFIG_UPDATE_BIT, 431 CDNS_MCP_CONFIG_UPDATE_BIT); 432 433 /* Continue bus operation with parity error injection disabled */ 434 mutex_unlock(&bus->bus_lock); 435 436 /* Userspace changed the hardware state behind the kernel's back */ 437 add_taint(TAINT_USER, LOCKDEP_STILL_OK); 438 439 /* 440 * allow Master device to enter pm_runtime suspend. This may 441 * also result in Slave devices suspending. 442 */ 443 pm_runtime_mark_last_busy(bus->dev); 444 pm_runtime_put_autosuspend(bus->dev); 445 446 return 0; 447 } 448 449 DEFINE_DEBUGFS_ATTRIBUTE(cdns_parity_error_fops, NULL, 450 cdns_parity_error_injection, "%llu\n"); 451 452 static int cdns_set_pdi_loopback_source(void *data, u64 value) 453 { 454 struct sdw_cdns *cdns = data; 455 unsigned int pdi_out_num = cdns->pcm.num_bd + cdns->pcm.num_out; 456 457 if (value > pdi_out_num) 458 return -EINVAL; 459 460 /* Userspace changed the hardware state behind the kernel's back */ 461 add_taint(TAINT_USER, LOCKDEP_STILL_OK); 462 463 cdns->pdi_loopback_source = value; 464 465 return 0; 466 } 467 DEFINE_DEBUGFS_ATTRIBUTE(cdns_pdi_loopback_source_fops, NULL, cdns_set_pdi_loopback_source, "%llu\n"); 468 469 static int cdns_set_pdi_loopback_target(void *data, u64 value) 470 { 471 struct sdw_cdns *cdns = data; 472 unsigned int pdi_in_num = cdns->pcm.num_bd + cdns->pcm.num_in; 473 474 if (value > pdi_in_num) 475 return -EINVAL; 476 477 /* Userspace changed the hardware state behind the kernel's back */ 478 add_taint(TAINT_USER, LOCKDEP_STILL_OK); 479 480 cdns->pdi_loopback_target = value; 481 482 return 0; 483 } 484 DEFINE_DEBUGFS_ATTRIBUTE(cdns_pdi_loopback_target_fops, NULL, cdns_set_pdi_loopback_target, "%llu\n"); 485 486 /** 487 * sdw_cdns_debugfs_init() - Cadence debugfs init 488 * @cdns: Cadence instance 489 * @root: debugfs root 490 */ 491 void sdw_cdns_debugfs_init(struct sdw_cdns *cdns, struct dentry *root) 492 { 493 debugfs_create_file("cdns-registers", 0400, root, cdns, &cdns_reg_fops); 494 495 debugfs_create_file("cdns-hw-reset", 0200, root, cdns, 496 &cdns_hw_reset_fops); 497 498 debugfs_create_file("cdns-parity-error-injection", 0200, root, cdns, 499 &cdns_parity_error_fops); 500 501 cdns->pdi_loopback_source = -1; 502 cdns->pdi_loopback_target = -1; 503 504 debugfs_create_file("cdns-pdi-loopback-source", 0200, root, cdns, 505 &cdns_pdi_loopback_source_fops); 506 507 debugfs_create_file("cdns-pdi-loopback-target", 0200, root, cdns, 508 &cdns_pdi_loopback_target_fops); 509 510 } 511 EXPORT_SYMBOL_GPL(sdw_cdns_debugfs_init); 512 513 #endif /* CONFIG_DEBUG_FS */ 514 515 /* 516 * IO Calls 517 */ 518 static enum sdw_command_response 519 cdns_fill_msg_resp(struct sdw_cdns *cdns, 520 struct sdw_msg *msg, int count, int offset) 521 { 522 int nack = 0, no_ack = 0; 523 int i; 524 525 /* check message response */ 526 for (i = 0; i < count; i++) { 527 if (!(cdns->response_buf[i] & CDNS_MCP_RESP_ACK)) { 528 no_ack = 1; 529 dev_vdbg(cdns->dev, "Msg Ack not received, cmd %d\n", i); 530 } 531 if (cdns->response_buf[i] & CDNS_MCP_RESP_NACK) { 532 nack = 1; 533 dev_err_ratelimited(cdns->dev, "Msg NACK received, cmd %d\n", i); 534 } 535 } 536 537 if (nack) { 538 dev_err_ratelimited(cdns->dev, "Msg NACKed for Slave %d\n", msg->dev_num); 539 return SDW_CMD_FAIL; 540 } 541 542 if (no_ack) { 543 dev_dbg_ratelimited(cdns->dev, "Msg ignored for Slave %d\n", msg->dev_num); 544 return SDW_CMD_IGNORED; 545 } 546 547 /* fill response */ 548 for (i = 0; i < count; i++) 549 msg->buf[i + offset] = FIELD_GET(CDNS_MCP_RESP_RDATA, cdns->response_buf[i]); 550 551 return SDW_CMD_OK; 552 } 553 554 static enum sdw_command_response 555 _cdns_xfer_msg(struct sdw_cdns *cdns, struct sdw_msg *msg, int cmd, 556 int offset, int count, bool defer) 557 { 558 unsigned long time; 559 u32 base, i, data; 560 u16 addr; 561 562 /* Program the watermark level for RX FIFO */ 563 if (cdns->msg_count != count) { 564 cdns_writel(cdns, CDNS_MCP_FIFOLEVEL, count); 565 cdns->msg_count = count; 566 } 567 568 base = CDNS_MCP_CMD_BASE; 569 addr = msg->addr; 570 571 for (i = 0; i < count; i++) { 572 data = FIELD_PREP(CDNS_MCP_CMD_DEV_ADDR, msg->dev_num); 573 data |= FIELD_PREP(CDNS_MCP_CMD_COMMAND, cmd); 574 data |= FIELD_PREP(CDNS_MCP_CMD_REG_ADDR, addr); 575 addr++; 576 577 if (msg->flags == SDW_MSG_FLAG_WRITE) 578 data |= msg->buf[i + offset]; 579 580 data |= FIELD_PREP(CDNS_MCP_CMD_SSP_TAG, msg->ssp_sync); 581 cdns_writel(cdns, base, data); 582 base += CDNS_MCP_CMD_WORD_LEN; 583 } 584 585 if (defer) 586 return SDW_CMD_OK; 587 588 /* wait for timeout or response */ 589 time = wait_for_completion_timeout(&cdns->tx_complete, 590 msecs_to_jiffies(CDNS_TX_TIMEOUT)); 591 if (!time) { 592 dev_err(cdns->dev, "IO transfer timed out, cmd %d device %d addr %x len %d\n", 593 cmd, msg->dev_num, msg->addr, msg->len); 594 msg->len = 0; 595 return SDW_CMD_TIMEOUT; 596 } 597 598 return cdns_fill_msg_resp(cdns, msg, count, offset); 599 } 600 601 static enum sdw_command_response 602 cdns_program_scp_addr(struct sdw_cdns *cdns, struct sdw_msg *msg) 603 { 604 int nack = 0, no_ack = 0; 605 unsigned long time; 606 u32 data[2], base; 607 int i; 608 609 /* Program the watermark level for RX FIFO */ 610 if (cdns->msg_count != CDNS_SCP_RX_FIFOLEVEL) { 611 cdns_writel(cdns, CDNS_MCP_FIFOLEVEL, CDNS_SCP_RX_FIFOLEVEL); 612 cdns->msg_count = CDNS_SCP_RX_FIFOLEVEL; 613 } 614 615 data[0] = FIELD_PREP(CDNS_MCP_CMD_DEV_ADDR, msg->dev_num); 616 data[0] |= FIELD_PREP(CDNS_MCP_CMD_COMMAND, 0x3); 617 data[1] = data[0]; 618 619 data[0] |= FIELD_PREP(CDNS_MCP_CMD_REG_ADDR, SDW_SCP_ADDRPAGE1); 620 data[1] |= FIELD_PREP(CDNS_MCP_CMD_REG_ADDR, SDW_SCP_ADDRPAGE2); 621 622 data[0] |= msg->addr_page1; 623 data[1] |= msg->addr_page2; 624 625 base = CDNS_MCP_CMD_BASE; 626 cdns_writel(cdns, base, data[0]); 627 base += CDNS_MCP_CMD_WORD_LEN; 628 cdns_writel(cdns, base, data[1]); 629 630 time = wait_for_completion_timeout(&cdns->tx_complete, 631 msecs_to_jiffies(CDNS_TX_TIMEOUT)); 632 if (!time) { 633 dev_err(cdns->dev, "SCP Msg trf timed out\n"); 634 msg->len = 0; 635 return SDW_CMD_TIMEOUT; 636 } 637 638 /* check response the writes */ 639 for (i = 0; i < 2; i++) { 640 if (!(cdns->response_buf[i] & CDNS_MCP_RESP_ACK)) { 641 no_ack = 1; 642 dev_err(cdns->dev, "Program SCP Ack not received\n"); 643 if (cdns->response_buf[i] & CDNS_MCP_RESP_NACK) { 644 nack = 1; 645 dev_err(cdns->dev, "Program SCP NACK received\n"); 646 } 647 } 648 } 649 650 /* For NACK, NO ack, don't return err if we are in Broadcast mode */ 651 if (nack) { 652 dev_err_ratelimited(cdns->dev, 653 "SCP_addrpage NACKed for Slave %d\n", msg->dev_num); 654 return SDW_CMD_FAIL; 655 } 656 657 if (no_ack) { 658 dev_dbg_ratelimited(cdns->dev, 659 "SCP_addrpage ignored for Slave %d\n", msg->dev_num); 660 return SDW_CMD_IGNORED; 661 } 662 663 return SDW_CMD_OK; 664 } 665 666 static int cdns_prep_msg(struct sdw_cdns *cdns, struct sdw_msg *msg, int *cmd) 667 { 668 int ret; 669 670 if (msg->page) { 671 ret = cdns_program_scp_addr(cdns, msg); 672 if (ret) { 673 msg->len = 0; 674 return ret; 675 } 676 } 677 678 switch (msg->flags) { 679 case SDW_MSG_FLAG_READ: 680 *cmd = CDNS_MCP_CMD_READ; 681 break; 682 683 case SDW_MSG_FLAG_WRITE: 684 *cmd = CDNS_MCP_CMD_WRITE; 685 break; 686 687 default: 688 dev_err(cdns->dev, "Invalid msg cmd: %d\n", msg->flags); 689 return -EINVAL; 690 } 691 692 return 0; 693 } 694 695 enum sdw_command_response 696 cdns_xfer_msg(struct sdw_bus *bus, struct sdw_msg *msg) 697 { 698 struct sdw_cdns *cdns = bus_to_cdns(bus); 699 int cmd = 0, ret, i; 700 701 ret = cdns_prep_msg(cdns, msg, &cmd); 702 if (ret) 703 return SDW_CMD_FAIL_OTHER; 704 705 for (i = 0; i < msg->len / CDNS_MCP_CMD_LEN; i++) { 706 ret = _cdns_xfer_msg(cdns, msg, cmd, i * CDNS_MCP_CMD_LEN, 707 CDNS_MCP_CMD_LEN, false); 708 if (ret < 0) 709 goto exit; 710 } 711 712 if (!(msg->len % CDNS_MCP_CMD_LEN)) 713 goto exit; 714 715 ret = _cdns_xfer_msg(cdns, msg, cmd, i * CDNS_MCP_CMD_LEN, 716 msg->len % CDNS_MCP_CMD_LEN, false); 717 718 exit: 719 return ret; 720 } 721 EXPORT_SYMBOL(cdns_xfer_msg); 722 723 enum sdw_command_response 724 cdns_xfer_msg_defer(struct sdw_bus *bus, 725 struct sdw_msg *msg, struct sdw_defer *defer) 726 { 727 struct sdw_cdns *cdns = bus_to_cdns(bus); 728 int cmd = 0, ret; 729 730 /* for defer only 1 message is supported */ 731 if (msg->len > 1) 732 return -ENOTSUPP; 733 734 ret = cdns_prep_msg(cdns, msg, &cmd); 735 if (ret) 736 return SDW_CMD_FAIL_OTHER; 737 738 cdns->defer = defer; 739 cdns->defer->length = msg->len; 740 741 return _cdns_xfer_msg(cdns, msg, cmd, 0, msg->len, true); 742 } 743 EXPORT_SYMBOL(cdns_xfer_msg_defer); 744 745 enum sdw_command_response 746 cdns_reset_page_addr(struct sdw_bus *bus, unsigned int dev_num) 747 { 748 struct sdw_cdns *cdns = bus_to_cdns(bus); 749 struct sdw_msg msg; 750 751 /* Create dummy message with valid device number */ 752 memset(&msg, 0, sizeof(msg)); 753 msg.dev_num = dev_num; 754 755 return cdns_program_scp_addr(cdns, &msg); 756 } 757 EXPORT_SYMBOL(cdns_reset_page_addr); 758 759 /* 760 * IRQ handling 761 */ 762 763 static void cdns_read_response(struct sdw_cdns *cdns) 764 { 765 u32 num_resp, cmd_base; 766 int i; 767 768 num_resp = cdns_readl(cdns, CDNS_MCP_FIFOSTAT); 769 num_resp &= CDNS_MCP_RX_FIFO_AVAIL; 770 771 cmd_base = CDNS_MCP_CMD_BASE; 772 773 for (i = 0; i < num_resp; i++) { 774 cdns->response_buf[i] = cdns_readl(cdns, cmd_base); 775 cmd_base += CDNS_MCP_CMD_WORD_LEN; 776 } 777 } 778 779 static int cdns_update_slave_status(struct sdw_cdns *cdns, 780 u64 slave_intstat) 781 { 782 enum sdw_slave_status status[SDW_MAX_DEVICES + 1]; 783 bool is_slave = false; 784 u32 mask; 785 u32 val; 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; 793 794 set_status = 0; 795 796 if (mask) { 797 is_slave = true; 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 } 819 820 /* 821 * check that there was a single reported Slave status and when 822 * there is not use the latest status extracted from PING commands 823 */ 824 if (set_status != 1) { 825 val = cdns_readl(cdns, CDNS_MCP_SLAVE_STAT); 826 val >>= (i * 2); 827 828 switch (val & 0x3) { 829 case 0: 830 status[i] = SDW_SLAVE_UNATTACHED; 831 break; 832 case 1: 833 status[i] = SDW_SLAVE_ATTACHED; 834 break; 835 case 2: 836 status[i] = SDW_SLAVE_ALERT; 837 break; 838 case 3: 839 default: 840 status[i] = SDW_SLAVE_RESERVED; 841 break; 842 } 843 } 844 } 845 846 if (is_slave) 847 return sdw_handle_slave_status(&cdns->bus, status); 848 849 return 0; 850 } 851 852 /** 853 * sdw_cdns_irq() - Cadence interrupt handler 854 * @irq: irq number 855 * @dev_id: irq context 856 */ 857 irqreturn_t sdw_cdns_irq(int irq, void *dev_id) 858 { 859 struct sdw_cdns *cdns = dev_id; 860 u32 int_status; 861 862 /* Check if the link is up */ 863 if (!cdns->link_up) 864 return IRQ_NONE; 865 866 int_status = cdns_readl(cdns, CDNS_MCP_INTSTAT); 867 868 /* check for reserved values read as zero */ 869 if (int_status & CDNS_MCP_INT_RESERVED) 870 return IRQ_NONE; 871 872 if (!(int_status & CDNS_MCP_INT_IRQ)) 873 return IRQ_NONE; 874 875 if (int_status & CDNS_MCP_INT_RX_WL) { 876 cdns_read_response(cdns); 877 878 if (cdns->defer) { 879 cdns_fill_msg_resp(cdns, cdns->defer->msg, 880 cdns->defer->length, 0); 881 complete(&cdns->defer->complete); 882 cdns->defer = NULL; 883 } else { 884 complete(&cdns->tx_complete); 885 } 886 } 887 888 if (int_status & CDNS_MCP_INT_PARITY) { 889 /* Parity error detected by Master */ 890 dev_err_ratelimited(cdns->dev, "Parity error\n"); 891 } 892 893 if (int_status & CDNS_MCP_INT_CTRL_CLASH) { 894 /* Slave is driving bit slot during control word */ 895 dev_err_ratelimited(cdns->dev, "Bus clash for control word\n"); 896 } 897 898 if (int_status & CDNS_MCP_INT_DATA_CLASH) { 899 /* 900 * Multiple slaves trying to drive bit slot, or issue with 901 * ownership of data bits or Slave gone bonkers 902 */ 903 dev_err_ratelimited(cdns->dev, "Bus clash for data word\n"); 904 } 905 906 if (cdns->bus.params.m_data_mode != SDW_PORT_DATA_MODE_NORMAL && 907 int_status & CDNS_MCP_INT_DPINT) { 908 u32 port_intstat; 909 910 /* just log which ports report an error */ 911 port_intstat = cdns_readl(cdns, CDNS_MCP_PORT_INTSTAT); 912 dev_err_ratelimited(cdns->dev, "DP interrupt: PortIntStat %8x\n", 913 port_intstat); 914 915 /* clear status w/ write1 */ 916 cdns_writel(cdns, CDNS_MCP_PORT_INTSTAT, port_intstat); 917 } 918 919 if (int_status & CDNS_MCP_INT_SLAVE_MASK) { 920 /* Mask the Slave interrupt and wake thread */ 921 cdns_updatel(cdns, CDNS_MCP_INTMASK, 922 CDNS_MCP_INT_SLAVE_MASK, 0); 923 924 int_status &= ~CDNS_MCP_INT_SLAVE_MASK; 925 926 /* 927 * Deal with possible race condition between interrupt 928 * handling and disabling interrupts on suspend. 929 * 930 * If the master is in the process of disabling 931 * interrupts, don't schedule a workqueue 932 */ 933 if (cdns->interrupt_enabled) 934 schedule_work(&cdns->work); 935 } 936 937 cdns_writel(cdns, CDNS_MCP_INTSTAT, int_status); 938 return IRQ_HANDLED; 939 } 940 EXPORT_SYMBOL(sdw_cdns_irq); 941 942 /** 943 * cdns_update_slave_status_work - update slave status in a work since we will need to handle 944 * other interrupts eg. CDNS_MCP_INT_RX_WL during the update slave 945 * process. 946 * @work: cdns worker thread 947 */ 948 static void cdns_update_slave_status_work(struct work_struct *work) 949 { 950 struct sdw_cdns *cdns = 951 container_of(work, struct sdw_cdns, work); 952 u32 slave0, slave1; 953 u64 slave_intstat; 954 u32 device0_status; 955 int retry_count = 0; 956 957 slave0 = cdns_readl(cdns, CDNS_MCP_SLAVE_INTSTAT0); 958 slave1 = cdns_readl(cdns, CDNS_MCP_SLAVE_INTSTAT1); 959 960 /* combine the two status */ 961 slave_intstat = ((u64)slave1 << 32) | slave0; 962 963 dev_dbg_ratelimited(cdns->dev, "Slave status change: 0x%llx\n", slave_intstat); 964 965 update_status: 966 cdns_update_slave_status(cdns, slave_intstat); 967 cdns_writel(cdns, CDNS_MCP_SLAVE_INTSTAT0, slave0); 968 cdns_writel(cdns, CDNS_MCP_SLAVE_INTSTAT1, slave1); 969 970 /* 971 * When there is more than one peripheral per link, it's 972 * possible that a deviceB becomes attached after we deal with 973 * the attachment of deviceA. Since the hardware does a 974 * logical AND, the attachment of the second device does not 975 * change the status seen by the driver. 976 * 977 * In that case, clearing the registers above would result in 978 * the deviceB never being detected - until a change of status 979 * is observed on the bus. 980 * 981 * To avoid this race condition, re-check if any device0 needs 982 * attention with PING commands. There is no need to check for 983 * ALERTS since they are not allowed until a non-zero 984 * device_number is assigned. 985 */ 986 987 device0_status = cdns_readl(cdns, CDNS_MCP_SLAVE_STAT); 988 device0_status &= 3; 989 990 if (device0_status == SDW_SLAVE_ATTACHED) { 991 if (retry_count++ < SDW_MAX_DEVICES) { 992 dev_dbg_ratelimited(cdns->dev, 993 "Device0 detected after clearing status, iteration %d\n", 994 retry_count); 995 slave_intstat = CDNS_MCP_SLAVE_INTSTAT_ATTACHED; 996 goto update_status; 997 } else { 998 dev_err_ratelimited(cdns->dev, 999 "Device0 detected after %d iterations\n", 1000 retry_count); 1001 } 1002 } 1003 1004 /* clear and unmask Slave interrupt now */ 1005 cdns_writel(cdns, CDNS_MCP_INTSTAT, CDNS_MCP_INT_SLAVE_MASK); 1006 cdns_updatel(cdns, CDNS_MCP_INTMASK, 1007 CDNS_MCP_INT_SLAVE_MASK, CDNS_MCP_INT_SLAVE_MASK); 1008 1009 } 1010 1011 /* paranoia check to make sure self-cleared bits are indeed cleared */ 1012 void sdw_cdns_check_self_clearing_bits(struct sdw_cdns *cdns, const char *string, 1013 bool initial_delay, int reset_iterations) 1014 { 1015 u32 mcp_control; 1016 u32 mcp_config_update; 1017 int i; 1018 1019 if (initial_delay) 1020 usleep_range(1000, 1500); 1021 1022 mcp_control = cdns_readl(cdns, CDNS_MCP_CONTROL); 1023 1024 /* the following bits should be cleared immediately */ 1025 if (mcp_control & CDNS_MCP_CONTROL_CMD_RST) 1026 dev_err(cdns->dev, "%s failed: MCP_CONTROL_CMD_RST is not cleared\n", string); 1027 if (mcp_control & CDNS_MCP_CONTROL_SOFT_RST) 1028 dev_err(cdns->dev, "%s failed: MCP_CONTROL_SOFT_RST is not cleared\n", string); 1029 if (mcp_control & CDNS_MCP_CONTROL_SW_RST) 1030 dev_err(cdns->dev, "%s failed: MCP_CONTROL_SW_RST is not cleared\n", string); 1031 if (mcp_control & CDNS_MCP_CONTROL_CLK_STOP_CLR) 1032 dev_err(cdns->dev, "%s failed: MCP_CONTROL_CLK_STOP_CLR is not cleared\n", string); 1033 mcp_config_update = cdns_readl(cdns, CDNS_MCP_CONFIG_UPDATE); 1034 if (mcp_config_update & CDNS_MCP_CONFIG_UPDATE_BIT) 1035 dev_err(cdns->dev, "%s failed: MCP_CONFIG_UPDATE_BIT is not cleared\n", string); 1036 1037 i = 0; 1038 while (mcp_control & CDNS_MCP_CONTROL_HW_RST) { 1039 if (i == reset_iterations) { 1040 dev_err(cdns->dev, "%s failed: MCP_CONTROL_HW_RST is not cleared\n", string); 1041 break; 1042 } 1043 1044 dev_dbg(cdns->dev, "%s: MCP_CONTROL_HW_RST is not cleared at iteration %d\n", string, i); 1045 i++; 1046 1047 usleep_range(1000, 1500); 1048 mcp_control = cdns_readl(cdns, CDNS_MCP_CONTROL); 1049 } 1050 1051 } 1052 EXPORT_SYMBOL(sdw_cdns_check_self_clearing_bits); 1053 1054 /* 1055 * init routines 1056 */ 1057 1058 /** 1059 * sdw_cdns_exit_reset() - Program reset parameters and start bus operations 1060 * @cdns: Cadence instance 1061 */ 1062 int sdw_cdns_exit_reset(struct sdw_cdns *cdns) 1063 { 1064 /* keep reset delay unchanged to 4096 cycles */ 1065 1066 /* use hardware generated reset */ 1067 cdns_updatel(cdns, CDNS_MCP_CONTROL, 1068 CDNS_MCP_CONTROL_HW_RST, 1069 CDNS_MCP_CONTROL_HW_RST); 1070 1071 /* commit changes */ 1072 cdns_updatel(cdns, CDNS_MCP_CONFIG_UPDATE, 1073 CDNS_MCP_CONFIG_UPDATE_BIT, 1074 CDNS_MCP_CONFIG_UPDATE_BIT); 1075 1076 /* don't wait here */ 1077 return 0; 1078 1079 } 1080 EXPORT_SYMBOL(sdw_cdns_exit_reset); 1081 1082 /** 1083 * cdns_enable_slave_interrupts() - Enable SDW slave interrupts 1084 * @cdns: Cadence instance 1085 * @state: boolean for true/false 1086 */ 1087 static void cdns_enable_slave_interrupts(struct sdw_cdns *cdns, bool state) 1088 { 1089 u32 mask; 1090 1091 mask = cdns_readl(cdns, CDNS_MCP_INTMASK); 1092 if (state) 1093 mask |= CDNS_MCP_INT_SLAVE_MASK; 1094 else 1095 mask &= ~CDNS_MCP_INT_SLAVE_MASK; 1096 1097 cdns_writel(cdns, CDNS_MCP_INTMASK, mask); 1098 } 1099 1100 /** 1101 * sdw_cdns_enable_interrupt() - Enable SDW interrupts 1102 * @cdns: Cadence instance 1103 * @state: True if we are trying to enable interrupt. 1104 */ 1105 int sdw_cdns_enable_interrupt(struct sdw_cdns *cdns, bool state) 1106 { 1107 u32 slave_intmask0 = 0; 1108 u32 slave_intmask1 = 0; 1109 u32 mask = 0; 1110 1111 if (!state) 1112 goto update_masks; 1113 1114 slave_intmask0 = CDNS_MCP_SLAVE_INTMASK0_MASK; 1115 slave_intmask1 = CDNS_MCP_SLAVE_INTMASK1_MASK; 1116 1117 /* enable detection of all slave state changes */ 1118 mask = CDNS_MCP_INT_SLAVE_MASK; 1119 1120 /* enable detection of bus issues */ 1121 mask |= CDNS_MCP_INT_CTRL_CLASH | CDNS_MCP_INT_DATA_CLASH | 1122 CDNS_MCP_INT_PARITY; 1123 1124 /* port interrupt limited to test modes for now */ 1125 if (cdns->bus.params.m_data_mode != SDW_PORT_DATA_MODE_NORMAL) 1126 mask |= CDNS_MCP_INT_DPINT; 1127 1128 /* enable detection of RX fifo level */ 1129 mask |= CDNS_MCP_INT_RX_WL; 1130 1131 /* 1132 * CDNS_MCP_INT_IRQ needs to be set otherwise all previous 1133 * settings are irrelevant 1134 */ 1135 mask |= CDNS_MCP_INT_IRQ; 1136 1137 if (interrupt_mask) /* parameter override */ 1138 mask = interrupt_mask; 1139 1140 update_masks: 1141 /* clear slave interrupt status before enabling interrupt */ 1142 if (state) { 1143 u32 slave_state; 1144 1145 slave_state = cdns_readl(cdns, CDNS_MCP_SLAVE_INTSTAT0); 1146 cdns_writel(cdns, CDNS_MCP_SLAVE_INTSTAT0, slave_state); 1147 slave_state = cdns_readl(cdns, CDNS_MCP_SLAVE_INTSTAT1); 1148 cdns_writel(cdns, CDNS_MCP_SLAVE_INTSTAT1, slave_state); 1149 } 1150 cdns->interrupt_enabled = state; 1151 1152 /* 1153 * Complete any on-going status updates before updating masks, 1154 * and cancel queued status updates. 1155 * 1156 * There could be a race with a new interrupt thrown before 1157 * the 3 mask updates below are complete, so in the interrupt 1158 * we use the 'interrupt_enabled' status to prevent new work 1159 * from being queued. 1160 */ 1161 if (!state) 1162 cancel_work_sync(&cdns->work); 1163 1164 cdns_writel(cdns, CDNS_MCP_SLAVE_INTMASK0, slave_intmask0); 1165 cdns_writel(cdns, CDNS_MCP_SLAVE_INTMASK1, slave_intmask1); 1166 cdns_writel(cdns, CDNS_MCP_INTMASK, mask); 1167 1168 return 0; 1169 } 1170 EXPORT_SYMBOL(sdw_cdns_enable_interrupt); 1171 1172 static int cdns_allocate_pdi(struct sdw_cdns *cdns, 1173 struct sdw_cdns_pdi **stream, 1174 u32 num, u32 pdi_offset) 1175 { 1176 struct sdw_cdns_pdi *pdi; 1177 int i; 1178 1179 if (!num) 1180 return 0; 1181 1182 pdi = devm_kcalloc(cdns->dev, num, sizeof(*pdi), GFP_KERNEL); 1183 if (!pdi) 1184 return -ENOMEM; 1185 1186 for (i = 0; i < num; i++) { 1187 pdi[i].num = i + pdi_offset; 1188 } 1189 1190 *stream = pdi; 1191 return 0; 1192 } 1193 1194 /** 1195 * sdw_cdns_pdi_init() - PDI initialization routine 1196 * 1197 * @cdns: Cadence instance 1198 * @config: Stream configurations 1199 */ 1200 int sdw_cdns_pdi_init(struct sdw_cdns *cdns, 1201 struct sdw_cdns_stream_config config) 1202 { 1203 struct sdw_cdns_streams *stream; 1204 int offset; 1205 int ret; 1206 1207 cdns->pcm.num_bd = config.pcm_bd; 1208 cdns->pcm.num_in = config.pcm_in; 1209 cdns->pcm.num_out = config.pcm_out; 1210 1211 /* Allocate PDIs for PCMs */ 1212 stream = &cdns->pcm; 1213 1214 /* we allocate PDI0 and PDI1 which are used for Bulk */ 1215 offset = 0; 1216 1217 ret = cdns_allocate_pdi(cdns, &stream->bd, 1218 stream->num_bd, offset); 1219 if (ret) 1220 return ret; 1221 1222 offset += stream->num_bd; 1223 1224 ret = cdns_allocate_pdi(cdns, &stream->in, 1225 stream->num_in, offset); 1226 if (ret) 1227 return ret; 1228 1229 offset += stream->num_in; 1230 1231 ret = cdns_allocate_pdi(cdns, &stream->out, 1232 stream->num_out, offset); 1233 if (ret) 1234 return ret; 1235 1236 /* Update total number of PCM 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, 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 dma->stream_type = SDW_STREAM_PCM; 1709 1710 dma->bus = &cdns->bus; 1711 dma->link_id = cdns->instance; 1712 1713 dma->stream = stream; 1714 1715 if (direction == SNDRV_PCM_STREAM_PLAYBACK) 1716 dai->playback_dma_data = dma; 1717 else 1718 dai->capture_dma_data = dma; 1719 } else { 1720 /* for NULL stream we release allocated dma_data */ 1721 if (direction == SNDRV_PCM_STREAM_PLAYBACK) { 1722 kfree(dai->playback_dma_data); 1723 dai->playback_dma_data = NULL; 1724 } else { 1725 kfree(dai->capture_dma_data); 1726 dai->capture_dma_data = NULL; 1727 } 1728 } 1729 return 0; 1730 } 1731 EXPORT_SYMBOL(cdns_set_sdw_stream); 1732 1733 /** 1734 * cdns_find_pdi() - Find a free PDI 1735 * 1736 * @cdns: Cadence instance 1737 * @offset: Starting offset 1738 * @num: Number of PDIs 1739 * @pdi: PDI instances 1740 * @dai_id: DAI id 1741 * 1742 * Find a PDI for a given PDI array. The PDI num and dai_id are 1743 * expected to match, return NULL otherwise. 1744 */ 1745 static struct sdw_cdns_pdi *cdns_find_pdi(struct sdw_cdns *cdns, 1746 unsigned int offset, 1747 unsigned int num, 1748 struct sdw_cdns_pdi *pdi, 1749 int dai_id) 1750 { 1751 int i; 1752 1753 for (i = offset; i < offset + num; i++) 1754 if (pdi[i].num == dai_id) 1755 return &pdi[i]; 1756 1757 return NULL; 1758 } 1759 1760 /** 1761 * sdw_cdns_config_stream: Configure a stream 1762 * 1763 * @cdns: Cadence instance 1764 * @ch: Channel count 1765 * @dir: Data direction 1766 * @pdi: PDI to be used 1767 */ 1768 void sdw_cdns_config_stream(struct sdw_cdns *cdns, 1769 u32 ch, u32 dir, struct sdw_cdns_pdi *pdi) 1770 { 1771 u32 offset, val = 0; 1772 1773 if (dir == SDW_DATA_DIR_RX) { 1774 val = CDNS_PORTCTRL_DIRN; 1775 1776 if (cdns->bus.params.m_data_mode != SDW_PORT_DATA_MODE_NORMAL) 1777 val |= CDNS_PORTCTRL_TEST_FAILED; 1778 } 1779 offset = CDNS_PORTCTRL + pdi->num * CDNS_PORT_OFFSET; 1780 cdns_updatel(cdns, offset, 1781 CDNS_PORTCTRL_DIRN | CDNS_PORTCTRL_TEST_FAILED, 1782 val); 1783 1784 val = pdi->num; 1785 val |= CDNS_PDI_CONFIG_SOFT_RESET; 1786 val |= FIELD_PREP(CDNS_PDI_CONFIG_CHANNEL, (1 << ch) - 1); 1787 cdns_writel(cdns, CDNS_PDI_CONFIG(pdi->num), val); 1788 } 1789 EXPORT_SYMBOL(sdw_cdns_config_stream); 1790 1791 /** 1792 * sdw_cdns_alloc_pdi() - Allocate a PDI 1793 * 1794 * @cdns: Cadence instance 1795 * @stream: Stream to be allocated 1796 * @ch: Channel count 1797 * @dir: Data direction 1798 * @dai_id: DAI id 1799 */ 1800 struct sdw_cdns_pdi *sdw_cdns_alloc_pdi(struct sdw_cdns *cdns, 1801 struct sdw_cdns_streams *stream, 1802 u32 ch, u32 dir, int dai_id) 1803 { 1804 struct sdw_cdns_pdi *pdi = NULL; 1805 1806 if (dir == SDW_DATA_DIR_RX) 1807 pdi = cdns_find_pdi(cdns, 0, stream->num_in, stream->in, 1808 dai_id); 1809 else 1810 pdi = cdns_find_pdi(cdns, 0, stream->num_out, stream->out, 1811 dai_id); 1812 1813 /* check if we found a PDI, else find in bi-directional */ 1814 if (!pdi) 1815 pdi = cdns_find_pdi(cdns, 2, stream->num_bd, stream->bd, 1816 dai_id); 1817 1818 if (pdi) { 1819 pdi->l_ch_num = 0; 1820 pdi->h_ch_num = ch - 1; 1821 pdi->dir = dir; 1822 pdi->ch_count = ch; 1823 } 1824 1825 return pdi; 1826 } 1827 EXPORT_SYMBOL(sdw_cdns_alloc_pdi); 1828 1829 MODULE_LICENSE("Dual BSD/GPL"); 1830 MODULE_DESCRIPTION("Cadence Soundwire Library"); 1831