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 u32 cdns_read_ping_status(struct sdw_bus *bus) 760 { 761 struct sdw_cdns *cdns = bus_to_cdns(bus); 762 763 return cdns_readl(cdns, CDNS_MCP_SLAVE_STAT); 764 } 765 EXPORT_SYMBOL(cdns_read_ping_status); 766 767 /* 768 * IRQ handling 769 */ 770 771 static void cdns_read_response(struct sdw_cdns *cdns) 772 { 773 u32 num_resp, cmd_base; 774 int i; 775 776 num_resp = cdns_readl(cdns, CDNS_MCP_FIFOSTAT); 777 num_resp &= CDNS_MCP_RX_FIFO_AVAIL; 778 779 cmd_base = CDNS_MCP_CMD_BASE; 780 781 for (i = 0; i < num_resp; i++) { 782 cdns->response_buf[i] = cdns_readl(cdns, cmd_base); 783 cmd_base += CDNS_MCP_CMD_WORD_LEN; 784 } 785 } 786 787 static int cdns_update_slave_status(struct sdw_cdns *cdns, 788 u64 slave_intstat) 789 { 790 enum sdw_slave_status status[SDW_MAX_DEVICES + 1]; 791 bool is_slave = false; 792 u32 mask; 793 int i, set_status; 794 795 memset(status, 0, sizeof(status)); 796 797 for (i = 0; i <= SDW_MAX_DEVICES; i++) { 798 mask = (slave_intstat >> (i * CDNS_MCP_SLAVE_STATUS_NUM)) & 799 CDNS_MCP_SLAVE_STATUS_BITS; 800 if (!mask) 801 continue; 802 803 is_slave = true; 804 set_status = 0; 805 806 if (mask & CDNS_MCP_SLAVE_INTSTAT_RESERVED) { 807 status[i] = SDW_SLAVE_RESERVED; 808 set_status++; 809 } 810 811 if (mask & CDNS_MCP_SLAVE_INTSTAT_ATTACHED) { 812 status[i] = SDW_SLAVE_ATTACHED; 813 set_status++; 814 } 815 816 if (mask & CDNS_MCP_SLAVE_INTSTAT_ALERT) { 817 status[i] = SDW_SLAVE_ALERT; 818 set_status++; 819 } 820 821 if (mask & CDNS_MCP_SLAVE_INTSTAT_NPRESENT) { 822 status[i] = SDW_SLAVE_UNATTACHED; 823 set_status++; 824 } 825 826 /* first check if Slave reported multiple status */ 827 if (set_status > 1) { 828 u32 val; 829 830 dev_warn_ratelimited(cdns->dev, 831 "Slave %d reported multiple Status: %d\n", 832 i, mask); 833 834 /* check latest status extracted from PING commands */ 835 val = cdns_readl(cdns, CDNS_MCP_SLAVE_STAT); 836 val >>= (i * 2); 837 838 switch (val & 0x3) { 839 case 0: 840 status[i] = SDW_SLAVE_UNATTACHED; 841 break; 842 case 1: 843 status[i] = SDW_SLAVE_ATTACHED; 844 break; 845 case 2: 846 status[i] = SDW_SLAVE_ALERT; 847 break; 848 case 3: 849 default: 850 status[i] = SDW_SLAVE_RESERVED; 851 break; 852 } 853 854 dev_warn_ratelimited(cdns->dev, 855 "Slave %d status updated to %d\n", 856 i, status[i]); 857 858 } 859 } 860 861 if (is_slave) 862 return sdw_handle_slave_status(&cdns->bus, status); 863 864 return 0; 865 } 866 867 /** 868 * sdw_cdns_irq() - Cadence interrupt handler 869 * @irq: irq number 870 * @dev_id: irq context 871 */ 872 irqreturn_t sdw_cdns_irq(int irq, void *dev_id) 873 { 874 struct sdw_cdns *cdns = dev_id; 875 u32 int_status; 876 877 /* Check if the link is up */ 878 if (!cdns->link_up) 879 return IRQ_NONE; 880 881 int_status = cdns_readl(cdns, CDNS_MCP_INTSTAT); 882 883 /* check for reserved values read as zero */ 884 if (int_status & CDNS_MCP_INT_RESERVED) 885 return IRQ_NONE; 886 887 if (!(int_status & CDNS_MCP_INT_IRQ)) 888 return IRQ_NONE; 889 890 if (int_status & CDNS_MCP_INT_RX_WL) { 891 cdns_read_response(cdns); 892 893 if (cdns->defer) { 894 cdns_fill_msg_resp(cdns, cdns->defer->msg, 895 cdns->defer->length, 0); 896 complete(&cdns->defer->complete); 897 cdns->defer = NULL; 898 } else { 899 complete(&cdns->tx_complete); 900 } 901 } 902 903 if (int_status & CDNS_MCP_INT_PARITY) { 904 /* Parity error detected by Master */ 905 dev_err_ratelimited(cdns->dev, "Parity error\n"); 906 } 907 908 if (int_status & CDNS_MCP_INT_CTRL_CLASH) { 909 /* Slave is driving bit slot during control word */ 910 dev_err_ratelimited(cdns->dev, "Bus clash for control word\n"); 911 } 912 913 if (int_status & CDNS_MCP_INT_DATA_CLASH) { 914 /* 915 * Multiple slaves trying to drive bit slot, or issue with 916 * ownership of data bits or Slave gone bonkers 917 */ 918 dev_err_ratelimited(cdns->dev, "Bus clash for data word\n"); 919 } 920 921 if (cdns->bus.params.m_data_mode != SDW_PORT_DATA_MODE_NORMAL && 922 int_status & CDNS_MCP_INT_DPINT) { 923 u32 port_intstat; 924 925 /* just log which ports report an error */ 926 port_intstat = cdns_readl(cdns, CDNS_MCP_PORT_INTSTAT); 927 dev_err_ratelimited(cdns->dev, "DP interrupt: PortIntStat %8x\n", 928 port_intstat); 929 930 /* clear status w/ write1 */ 931 cdns_writel(cdns, CDNS_MCP_PORT_INTSTAT, port_intstat); 932 } 933 934 if (int_status & CDNS_MCP_INT_SLAVE_MASK) { 935 /* Mask the Slave interrupt and wake thread */ 936 cdns_updatel(cdns, CDNS_MCP_INTMASK, 937 CDNS_MCP_INT_SLAVE_MASK, 0); 938 939 int_status &= ~CDNS_MCP_INT_SLAVE_MASK; 940 941 /* 942 * Deal with possible race condition between interrupt 943 * handling and disabling interrupts on suspend. 944 * 945 * If the master is in the process of disabling 946 * interrupts, don't schedule a workqueue 947 */ 948 if (cdns->interrupt_enabled) 949 schedule_work(&cdns->work); 950 } 951 952 cdns_writel(cdns, CDNS_MCP_INTSTAT, int_status); 953 return IRQ_HANDLED; 954 } 955 EXPORT_SYMBOL(sdw_cdns_irq); 956 957 /** 958 * cdns_update_slave_status_work - update slave status in a work since we will need to handle 959 * other interrupts eg. CDNS_MCP_INT_RX_WL during the update slave 960 * process. 961 * @work: cdns worker thread 962 */ 963 static void cdns_update_slave_status_work(struct work_struct *work) 964 { 965 struct sdw_cdns *cdns = 966 container_of(work, struct sdw_cdns, work); 967 u32 slave0, slave1; 968 u64 slave_intstat; 969 u32 device0_status; 970 int retry_count = 0; 971 972 slave0 = cdns_readl(cdns, CDNS_MCP_SLAVE_INTSTAT0); 973 slave1 = cdns_readl(cdns, CDNS_MCP_SLAVE_INTSTAT1); 974 975 /* combine the two status */ 976 slave_intstat = ((u64)slave1 << 32) | slave0; 977 978 dev_dbg_ratelimited(cdns->dev, "Slave status change: 0x%llx\n", slave_intstat); 979 980 update_status: 981 cdns_update_slave_status(cdns, slave_intstat); 982 cdns_writel(cdns, CDNS_MCP_SLAVE_INTSTAT0, slave0); 983 cdns_writel(cdns, CDNS_MCP_SLAVE_INTSTAT1, slave1); 984 985 /* 986 * When there is more than one peripheral per link, it's 987 * possible that a deviceB becomes attached after we deal with 988 * the attachment of deviceA. Since the hardware does a 989 * logical AND, the attachment of the second device does not 990 * change the status seen by the driver. 991 * 992 * In that case, clearing the registers above would result in 993 * the deviceB never being detected - until a change of status 994 * is observed on the bus. 995 * 996 * To avoid this race condition, re-check if any device0 needs 997 * attention with PING commands. There is no need to check for 998 * ALERTS since they are not allowed until a non-zero 999 * device_number is assigned. 1000 */ 1001 1002 device0_status = cdns_readl(cdns, CDNS_MCP_SLAVE_STAT); 1003 device0_status &= 3; 1004 1005 if (device0_status == SDW_SLAVE_ATTACHED) { 1006 if (retry_count++ < SDW_MAX_DEVICES) { 1007 dev_dbg_ratelimited(cdns->dev, 1008 "Device0 detected after clearing status, iteration %d\n", 1009 retry_count); 1010 slave_intstat = CDNS_MCP_SLAVE_INTSTAT_ATTACHED; 1011 goto update_status; 1012 } else { 1013 dev_err_ratelimited(cdns->dev, 1014 "Device0 detected after %d iterations\n", 1015 retry_count); 1016 } 1017 } 1018 1019 /* clear and unmask Slave interrupt now */ 1020 cdns_writel(cdns, CDNS_MCP_INTSTAT, CDNS_MCP_INT_SLAVE_MASK); 1021 cdns_updatel(cdns, CDNS_MCP_INTMASK, 1022 CDNS_MCP_INT_SLAVE_MASK, CDNS_MCP_INT_SLAVE_MASK); 1023 1024 } 1025 1026 /* paranoia check to make sure self-cleared bits are indeed cleared */ 1027 void sdw_cdns_check_self_clearing_bits(struct sdw_cdns *cdns, const char *string, 1028 bool initial_delay, int reset_iterations) 1029 { 1030 u32 mcp_control; 1031 u32 mcp_config_update; 1032 int i; 1033 1034 if (initial_delay) 1035 usleep_range(1000, 1500); 1036 1037 mcp_control = cdns_readl(cdns, CDNS_MCP_CONTROL); 1038 1039 /* the following bits should be cleared immediately */ 1040 if (mcp_control & CDNS_MCP_CONTROL_CMD_RST) 1041 dev_err(cdns->dev, "%s failed: MCP_CONTROL_CMD_RST is not cleared\n", string); 1042 if (mcp_control & CDNS_MCP_CONTROL_SOFT_RST) 1043 dev_err(cdns->dev, "%s failed: MCP_CONTROL_SOFT_RST is not cleared\n", string); 1044 if (mcp_control & CDNS_MCP_CONTROL_SW_RST) 1045 dev_err(cdns->dev, "%s failed: MCP_CONTROL_SW_RST is not cleared\n", string); 1046 if (mcp_control & CDNS_MCP_CONTROL_CLK_STOP_CLR) 1047 dev_err(cdns->dev, "%s failed: MCP_CONTROL_CLK_STOP_CLR is not cleared\n", string); 1048 mcp_config_update = cdns_readl(cdns, CDNS_MCP_CONFIG_UPDATE); 1049 if (mcp_config_update & CDNS_MCP_CONFIG_UPDATE_BIT) 1050 dev_err(cdns->dev, "%s failed: MCP_CONFIG_UPDATE_BIT is not cleared\n", string); 1051 1052 i = 0; 1053 while (mcp_control & CDNS_MCP_CONTROL_HW_RST) { 1054 if (i == reset_iterations) { 1055 dev_err(cdns->dev, "%s failed: MCP_CONTROL_HW_RST is not cleared\n", string); 1056 break; 1057 } 1058 1059 dev_dbg(cdns->dev, "%s: MCP_CONTROL_HW_RST is not cleared at iteration %d\n", string, i); 1060 i++; 1061 1062 usleep_range(1000, 1500); 1063 mcp_control = cdns_readl(cdns, CDNS_MCP_CONTROL); 1064 } 1065 1066 } 1067 EXPORT_SYMBOL(sdw_cdns_check_self_clearing_bits); 1068 1069 /* 1070 * init routines 1071 */ 1072 1073 /** 1074 * sdw_cdns_exit_reset() - Program reset parameters and start bus operations 1075 * @cdns: Cadence instance 1076 */ 1077 int sdw_cdns_exit_reset(struct sdw_cdns *cdns) 1078 { 1079 /* keep reset delay unchanged to 4096 cycles */ 1080 1081 /* use hardware generated reset */ 1082 cdns_updatel(cdns, CDNS_MCP_CONTROL, 1083 CDNS_MCP_CONTROL_HW_RST, 1084 CDNS_MCP_CONTROL_HW_RST); 1085 1086 /* commit changes */ 1087 cdns_updatel(cdns, CDNS_MCP_CONFIG_UPDATE, 1088 CDNS_MCP_CONFIG_UPDATE_BIT, 1089 CDNS_MCP_CONFIG_UPDATE_BIT); 1090 1091 /* don't wait here */ 1092 return 0; 1093 1094 } 1095 EXPORT_SYMBOL(sdw_cdns_exit_reset); 1096 1097 /** 1098 * cdns_enable_slave_interrupts() - Enable SDW slave interrupts 1099 * @cdns: Cadence instance 1100 * @state: boolean for true/false 1101 */ 1102 static void cdns_enable_slave_interrupts(struct sdw_cdns *cdns, bool state) 1103 { 1104 u32 mask; 1105 1106 mask = cdns_readl(cdns, CDNS_MCP_INTMASK); 1107 if (state) 1108 mask |= CDNS_MCP_INT_SLAVE_MASK; 1109 else 1110 mask &= ~CDNS_MCP_INT_SLAVE_MASK; 1111 1112 cdns_writel(cdns, CDNS_MCP_INTMASK, mask); 1113 } 1114 1115 /** 1116 * sdw_cdns_enable_interrupt() - Enable SDW interrupts 1117 * @cdns: Cadence instance 1118 * @state: True if we are trying to enable interrupt. 1119 */ 1120 int sdw_cdns_enable_interrupt(struct sdw_cdns *cdns, bool state) 1121 { 1122 u32 slave_intmask0 = 0; 1123 u32 slave_intmask1 = 0; 1124 u32 mask = 0; 1125 1126 if (!state) 1127 goto update_masks; 1128 1129 slave_intmask0 = CDNS_MCP_SLAVE_INTMASK0_MASK; 1130 slave_intmask1 = CDNS_MCP_SLAVE_INTMASK1_MASK; 1131 1132 /* enable detection of all slave state changes */ 1133 mask = CDNS_MCP_INT_SLAVE_MASK; 1134 1135 /* enable detection of bus issues */ 1136 mask |= CDNS_MCP_INT_CTRL_CLASH | CDNS_MCP_INT_DATA_CLASH | 1137 CDNS_MCP_INT_PARITY; 1138 1139 /* port interrupt limited to test modes for now */ 1140 if (cdns->bus.params.m_data_mode != SDW_PORT_DATA_MODE_NORMAL) 1141 mask |= CDNS_MCP_INT_DPINT; 1142 1143 /* enable detection of RX fifo level */ 1144 mask |= CDNS_MCP_INT_RX_WL; 1145 1146 /* 1147 * CDNS_MCP_INT_IRQ needs to be set otherwise all previous 1148 * settings are irrelevant 1149 */ 1150 mask |= CDNS_MCP_INT_IRQ; 1151 1152 if (interrupt_mask) /* parameter override */ 1153 mask = interrupt_mask; 1154 1155 update_masks: 1156 /* clear slave interrupt status before enabling interrupt */ 1157 if (state) { 1158 u32 slave_state; 1159 1160 slave_state = cdns_readl(cdns, CDNS_MCP_SLAVE_INTSTAT0); 1161 cdns_writel(cdns, CDNS_MCP_SLAVE_INTSTAT0, slave_state); 1162 slave_state = cdns_readl(cdns, CDNS_MCP_SLAVE_INTSTAT1); 1163 cdns_writel(cdns, CDNS_MCP_SLAVE_INTSTAT1, slave_state); 1164 } 1165 cdns->interrupt_enabled = state; 1166 1167 /* 1168 * Complete any on-going status updates before updating masks, 1169 * and cancel queued status updates. 1170 * 1171 * There could be a race with a new interrupt thrown before 1172 * the 3 mask updates below are complete, so in the interrupt 1173 * we use the 'interrupt_enabled' status to prevent new work 1174 * from being queued. 1175 */ 1176 if (!state) 1177 cancel_work_sync(&cdns->work); 1178 1179 cdns_writel(cdns, CDNS_MCP_SLAVE_INTMASK0, slave_intmask0); 1180 cdns_writel(cdns, CDNS_MCP_SLAVE_INTMASK1, slave_intmask1); 1181 cdns_writel(cdns, CDNS_MCP_INTMASK, mask); 1182 1183 return 0; 1184 } 1185 EXPORT_SYMBOL(sdw_cdns_enable_interrupt); 1186 1187 static int cdns_allocate_pdi(struct sdw_cdns *cdns, 1188 struct sdw_cdns_pdi **stream, 1189 u32 num, u32 pdi_offset) 1190 { 1191 struct sdw_cdns_pdi *pdi; 1192 int i; 1193 1194 if (!num) 1195 return 0; 1196 1197 pdi = devm_kcalloc(cdns->dev, num, sizeof(*pdi), GFP_KERNEL); 1198 if (!pdi) 1199 return -ENOMEM; 1200 1201 for (i = 0; i < num; i++) { 1202 pdi[i].num = i + pdi_offset; 1203 } 1204 1205 *stream = pdi; 1206 return 0; 1207 } 1208 1209 /** 1210 * sdw_cdns_pdi_init() - PDI initialization routine 1211 * 1212 * @cdns: Cadence instance 1213 * @config: Stream configurations 1214 */ 1215 int sdw_cdns_pdi_init(struct sdw_cdns *cdns, 1216 struct sdw_cdns_stream_config config) 1217 { 1218 struct sdw_cdns_streams *stream; 1219 int offset; 1220 int ret; 1221 1222 cdns->pcm.num_bd = config.pcm_bd; 1223 cdns->pcm.num_in = config.pcm_in; 1224 cdns->pcm.num_out = config.pcm_out; 1225 1226 /* Allocate PDIs for PCMs */ 1227 stream = &cdns->pcm; 1228 1229 /* we allocate PDI0 and PDI1 which are used for Bulk */ 1230 offset = 0; 1231 1232 ret = cdns_allocate_pdi(cdns, &stream->bd, 1233 stream->num_bd, offset); 1234 if (ret) 1235 return ret; 1236 1237 offset += stream->num_bd; 1238 1239 ret = cdns_allocate_pdi(cdns, &stream->in, 1240 stream->num_in, offset); 1241 if (ret) 1242 return ret; 1243 1244 offset += stream->num_in; 1245 1246 ret = cdns_allocate_pdi(cdns, &stream->out, 1247 stream->num_out, offset); 1248 if (ret) 1249 return ret; 1250 1251 /* Update total number of PCM PDIs */ 1252 stream->num_pdi = stream->num_bd + stream->num_in + stream->num_out; 1253 cdns->num_ports = stream->num_pdi; 1254 1255 return 0; 1256 } 1257 EXPORT_SYMBOL(sdw_cdns_pdi_init); 1258 1259 static u32 cdns_set_initial_frame_shape(int n_rows, int n_cols) 1260 { 1261 u32 val; 1262 int c; 1263 int r; 1264 1265 r = sdw_find_row_index(n_rows); 1266 c = sdw_find_col_index(n_cols); 1267 1268 val = FIELD_PREP(CDNS_MCP_FRAME_SHAPE_ROW_MASK, r); 1269 val |= FIELD_PREP(CDNS_MCP_FRAME_SHAPE_COL_MASK, c); 1270 1271 return val; 1272 } 1273 1274 static void cdns_init_clock_ctrl(struct sdw_cdns *cdns) 1275 { 1276 struct sdw_bus *bus = &cdns->bus; 1277 struct sdw_master_prop *prop = &bus->prop; 1278 u32 val; 1279 u32 ssp_interval; 1280 int divider; 1281 1282 /* Set clock divider */ 1283 divider = (prop->mclk_freq / prop->max_clk_freq) - 1; 1284 1285 cdns_updatel(cdns, CDNS_MCP_CLK_CTRL0, 1286 CDNS_MCP_CLK_MCLKD_MASK, divider); 1287 cdns_updatel(cdns, CDNS_MCP_CLK_CTRL1, 1288 CDNS_MCP_CLK_MCLKD_MASK, divider); 1289 1290 /* 1291 * Frame shape changes after initialization have to be done 1292 * with the bank switch mechanism 1293 */ 1294 val = cdns_set_initial_frame_shape(prop->default_row, 1295 prop->default_col); 1296 cdns_writel(cdns, CDNS_MCP_FRAME_SHAPE_INIT, val); 1297 1298 /* Set SSP interval to default value */ 1299 ssp_interval = prop->default_frame_rate / SDW_CADENCE_GSYNC_HZ; 1300 cdns_writel(cdns, CDNS_MCP_SSP_CTRL0, ssp_interval); 1301 cdns_writel(cdns, CDNS_MCP_SSP_CTRL1, ssp_interval); 1302 } 1303 1304 /** 1305 * sdw_cdns_init() - Cadence initialization 1306 * @cdns: Cadence instance 1307 */ 1308 int sdw_cdns_init(struct sdw_cdns *cdns) 1309 { 1310 u32 val; 1311 1312 cdns_init_clock_ctrl(cdns); 1313 1314 sdw_cdns_check_self_clearing_bits(cdns, __func__, false, 0); 1315 1316 /* reset msg_count to default value of FIFOLEVEL */ 1317 cdns->msg_count = cdns_readl(cdns, CDNS_MCP_FIFOLEVEL); 1318 1319 /* flush command FIFOs */ 1320 cdns_updatel(cdns, CDNS_MCP_CONTROL, CDNS_MCP_CONTROL_CMD_RST, 1321 CDNS_MCP_CONTROL_CMD_RST); 1322 1323 /* Set cmd accept mode */ 1324 cdns_updatel(cdns, CDNS_MCP_CONTROL, CDNS_MCP_CONTROL_CMD_ACCEPT, 1325 CDNS_MCP_CONTROL_CMD_ACCEPT); 1326 1327 /* Configure mcp config */ 1328 val = cdns_readl(cdns, CDNS_MCP_CONFIG); 1329 1330 /* enable bus operations with clock and data */ 1331 val &= ~CDNS_MCP_CONFIG_OP; 1332 val |= CDNS_MCP_CONFIG_OP_NORMAL; 1333 1334 /* Set cmd mode for Tx and Rx cmds */ 1335 val &= ~CDNS_MCP_CONFIG_CMD; 1336 1337 /* Disable sniffer mode */ 1338 val &= ~CDNS_MCP_CONFIG_SNIFFER; 1339 1340 /* Disable auto bus release */ 1341 val &= ~CDNS_MCP_CONFIG_BUS_REL; 1342 1343 if (cdns->bus.multi_link) 1344 /* Set Multi-master mode to take gsync into account */ 1345 val |= CDNS_MCP_CONFIG_MMASTER; 1346 1347 /* leave frame delay to hardware default of 0x1F */ 1348 1349 /* leave command retry to hardware default of 0 */ 1350 1351 cdns_writel(cdns, CDNS_MCP_CONFIG, val); 1352 1353 /* changes will be committed later */ 1354 return 0; 1355 } 1356 EXPORT_SYMBOL(sdw_cdns_init); 1357 1358 int cdns_bus_conf(struct sdw_bus *bus, struct sdw_bus_params *params) 1359 { 1360 struct sdw_master_prop *prop = &bus->prop; 1361 struct sdw_cdns *cdns = bus_to_cdns(bus); 1362 int mcp_clkctrl_off; 1363 int divider; 1364 1365 if (!params->curr_dr_freq) { 1366 dev_err(cdns->dev, "NULL curr_dr_freq\n"); 1367 return -EINVAL; 1368 } 1369 1370 divider = prop->mclk_freq * SDW_DOUBLE_RATE_FACTOR / 1371 params->curr_dr_freq; 1372 divider--; /* divider is 1/(N+1) */ 1373 1374 if (params->next_bank) 1375 mcp_clkctrl_off = CDNS_MCP_CLK_CTRL1; 1376 else 1377 mcp_clkctrl_off = CDNS_MCP_CLK_CTRL0; 1378 1379 cdns_updatel(cdns, mcp_clkctrl_off, CDNS_MCP_CLK_MCLKD_MASK, divider); 1380 1381 return 0; 1382 } 1383 EXPORT_SYMBOL(cdns_bus_conf); 1384 1385 static int cdns_port_params(struct sdw_bus *bus, 1386 struct sdw_port_params *p_params, unsigned int bank) 1387 { 1388 struct sdw_cdns *cdns = bus_to_cdns(bus); 1389 int dpn_config_off_source; 1390 int dpn_config_off_target; 1391 int target_num = p_params->num; 1392 int source_num = p_params->num; 1393 bool override = false; 1394 int dpn_config; 1395 1396 if (target_num == cdns->pdi_loopback_target && 1397 cdns->pdi_loopback_source != -1) { 1398 source_num = cdns->pdi_loopback_source; 1399 override = true; 1400 } 1401 1402 if (bank) { 1403 dpn_config_off_source = CDNS_DPN_B1_CONFIG(source_num); 1404 dpn_config_off_target = CDNS_DPN_B1_CONFIG(target_num); 1405 } else { 1406 dpn_config_off_source = CDNS_DPN_B0_CONFIG(source_num); 1407 dpn_config_off_target = CDNS_DPN_B0_CONFIG(target_num); 1408 } 1409 1410 dpn_config = cdns_readl(cdns, dpn_config_off_source); 1411 1412 /* use port params if there is no loopback, otherwise use source as is */ 1413 if (!override) { 1414 u32p_replace_bits(&dpn_config, p_params->bps - 1, CDNS_DPN_CONFIG_WL); 1415 u32p_replace_bits(&dpn_config, p_params->flow_mode, CDNS_DPN_CONFIG_PORT_FLOW); 1416 u32p_replace_bits(&dpn_config, p_params->data_mode, CDNS_DPN_CONFIG_PORT_DAT); 1417 } 1418 1419 cdns_writel(cdns, dpn_config_off_target, dpn_config); 1420 1421 return 0; 1422 } 1423 1424 static int cdns_transport_params(struct sdw_bus *bus, 1425 struct sdw_transport_params *t_params, 1426 enum sdw_reg_bank bank) 1427 { 1428 struct sdw_cdns *cdns = bus_to_cdns(bus); 1429 int dpn_config; 1430 int dpn_config_off_source; 1431 int dpn_config_off_target; 1432 int dpn_hctrl; 1433 int dpn_hctrl_off_source; 1434 int dpn_hctrl_off_target; 1435 int dpn_offsetctrl; 1436 int dpn_offsetctrl_off_source; 1437 int dpn_offsetctrl_off_target; 1438 int dpn_samplectrl; 1439 int dpn_samplectrl_off_source; 1440 int dpn_samplectrl_off_target; 1441 int source_num = t_params->port_num; 1442 int target_num = t_params->port_num; 1443 bool override = false; 1444 1445 if (target_num == cdns->pdi_loopback_target && 1446 cdns->pdi_loopback_source != -1) { 1447 source_num = cdns->pdi_loopback_source; 1448 override = true; 1449 } 1450 1451 /* 1452 * Note: Only full data port is supported on the Master side for 1453 * both PCM and PDM ports. 1454 */ 1455 1456 if (bank) { 1457 dpn_config_off_source = CDNS_DPN_B1_CONFIG(source_num); 1458 dpn_hctrl_off_source = CDNS_DPN_B1_HCTRL(source_num); 1459 dpn_offsetctrl_off_source = CDNS_DPN_B1_OFFSET_CTRL(source_num); 1460 dpn_samplectrl_off_source = CDNS_DPN_B1_SAMPLE_CTRL(source_num); 1461 1462 dpn_config_off_target = CDNS_DPN_B1_CONFIG(target_num); 1463 dpn_hctrl_off_target = CDNS_DPN_B1_HCTRL(target_num); 1464 dpn_offsetctrl_off_target = CDNS_DPN_B1_OFFSET_CTRL(target_num); 1465 dpn_samplectrl_off_target = CDNS_DPN_B1_SAMPLE_CTRL(target_num); 1466 1467 } else { 1468 dpn_config_off_source = CDNS_DPN_B0_CONFIG(source_num); 1469 dpn_hctrl_off_source = CDNS_DPN_B0_HCTRL(source_num); 1470 dpn_offsetctrl_off_source = CDNS_DPN_B0_OFFSET_CTRL(source_num); 1471 dpn_samplectrl_off_source = CDNS_DPN_B0_SAMPLE_CTRL(source_num); 1472 1473 dpn_config_off_target = CDNS_DPN_B0_CONFIG(target_num); 1474 dpn_hctrl_off_target = CDNS_DPN_B0_HCTRL(target_num); 1475 dpn_offsetctrl_off_target = CDNS_DPN_B0_OFFSET_CTRL(target_num); 1476 dpn_samplectrl_off_target = CDNS_DPN_B0_SAMPLE_CTRL(target_num); 1477 } 1478 1479 dpn_config = cdns_readl(cdns, dpn_config_off_source); 1480 if (!override) { 1481 u32p_replace_bits(&dpn_config, t_params->blk_grp_ctrl, CDNS_DPN_CONFIG_BGC); 1482 u32p_replace_bits(&dpn_config, t_params->blk_pkg_mode, CDNS_DPN_CONFIG_BPM); 1483 } 1484 cdns_writel(cdns, dpn_config_off_target, dpn_config); 1485 1486 if (!override) { 1487 dpn_offsetctrl = 0; 1488 u32p_replace_bits(&dpn_offsetctrl, t_params->offset1, CDNS_DPN_OFFSET_CTRL_1); 1489 u32p_replace_bits(&dpn_offsetctrl, t_params->offset2, CDNS_DPN_OFFSET_CTRL_2); 1490 } else { 1491 dpn_offsetctrl = cdns_readl(cdns, dpn_offsetctrl_off_source); 1492 } 1493 cdns_writel(cdns, dpn_offsetctrl_off_target, dpn_offsetctrl); 1494 1495 if (!override) { 1496 dpn_hctrl = 0; 1497 u32p_replace_bits(&dpn_hctrl, t_params->hstart, CDNS_DPN_HCTRL_HSTART); 1498 u32p_replace_bits(&dpn_hctrl, t_params->hstop, CDNS_DPN_HCTRL_HSTOP); 1499 u32p_replace_bits(&dpn_hctrl, t_params->lane_ctrl, CDNS_DPN_HCTRL_LCTRL); 1500 } else { 1501 dpn_hctrl = cdns_readl(cdns, dpn_hctrl_off_source); 1502 } 1503 cdns_writel(cdns, dpn_hctrl_off_target, dpn_hctrl); 1504 1505 if (!override) 1506 dpn_samplectrl = t_params->sample_interval - 1; 1507 else 1508 dpn_samplectrl = cdns_readl(cdns, dpn_samplectrl_off_source); 1509 cdns_writel(cdns, dpn_samplectrl_off_target, dpn_samplectrl); 1510 1511 return 0; 1512 } 1513 1514 static int cdns_port_enable(struct sdw_bus *bus, 1515 struct sdw_enable_ch *enable_ch, unsigned int bank) 1516 { 1517 struct sdw_cdns *cdns = bus_to_cdns(bus); 1518 int dpn_chnen_off, ch_mask; 1519 1520 if (bank) 1521 dpn_chnen_off = CDNS_DPN_B1_CH_EN(enable_ch->port_num); 1522 else 1523 dpn_chnen_off = CDNS_DPN_B0_CH_EN(enable_ch->port_num); 1524 1525 ch_mask = enable_ch->ch_mask * enable_ch->enable; 1526 cdns_writel(cdns, dpn_chnen_off, ch_mask); 1527 1528 return 0; 1529 } 1530 1531 static const struct sdw_master_port_ops cdns_port_ops = { 1532 .dpn_set_port_params = cdns_port_params, 1533 .dpn_set_port_transport_params = cdns_transport_params, 1534 .dpn_port_enable_ch = cdns_port_enable, 1535 }; 1536 1537 /** 1538 * sdw_cdns_is_clock_stop: Check clock status 1539 * 1540 * @cdns: Cadence instance 1541 */ 1542 bool sdw_cdns_is_clock_stop(struct sdw_cdns *cdns) 1543 { 1544 return !!(cdns_readl(cdns, CDNS_MCP_STAT) & CDNS_MCP_STAT_CLK_STOP); 1545 } 1546 EXPORT_SYMBOL(sdw_cdns_is_clock_stop); 1547 1548 /** 1549 * sdw_cdns_clock_stop: Cadence clock stop configuration routine 1550 * 1551 * @cdns: Cadence instance 1552 * @block_wake: prevent wakes if required by the platform 1553 */ 1554 int sdw_cdns_clock_stop(struct sdw_cdns *cdns, bool block_wake) 1555 { 1556 bool slave_present = false; 1557 struct sdw_slave *slave; 1558 int ret; 1559 1560 sdw_cdns_check_self_clearing_bits(cdns, __func__, false, 0); 1561 1562 /* Check suspend status */ 1563 if (sdw_cdns_is_clock_stop(cdns)) { 1564 dev_dbg(cdns->dev, "Clock is already stopped\n"); 1565 return 0; 1566 } 1567 1568 /* 1569 * Before entering clock stop we mask the Slave 1570 * interrupts. This helps avoid having to deal with e.g. a 1571 * Slave becoming UNATTACHED while the clock is being stopped 1572 */ 1573 cdns_enable_slave_interrupts(cdns, false); 1574 1575 /* 1576 * For specific platforms, it is required to be able to put 1577 * master into a state in which it ignores wake-up trials 1578 * in clock stop state 1579 */ 1580 if (block_wake) 1581 cdns_updatel(cdns, CDNS_MCP_CONTROL, 1582 CDNS_MCP_CONTROL_BLOCK_WAKEUP, 1583 CDNS_MCP_CONTROL_BLOCK_WAKEUP); 1584 1585 list_for_each_entry(slave, &cdns->bus.slaves, node) { 1586 if (slave->status == SDW_SLAVE_ATTACHED || 1587 slave->status == SDW_SLAVE_ALERT) { 1588 slave_present = true; 1589 break; 1590 } 1591 } 1592 1593 /* commit changes */ 1594 ret = cdns_config_update(cdns); 1595 if (ret < 0) { 1596 dev_err(cdns->dev, "%s: config_update failed\n", __func__); 1597 return ret; 1598 } 1599 1600 /* Prepare slaves for clock stop */ 1601 if (slave_present) { 1602 ret = sdw_bus_prep_clk_stop(&cdns->bus); 1603 if (ret < 0 && ret != -ENODATA) { 1604 dev_err(cdns->dev, "prepare clock stop failed %d\n", ret); 1605 return ret; 1606 } 1607 } 1608 1609 /* 1610 * Enter clock stop mode and only report errors if there are 1611 * Slave devices present (ALERT or ATTACHED) 1612 */ 1613 ret = sdw_bus_clk_stop(&cdns->bus); 1614 if (ret < 0 && slave_present && ret != -ENODATA) { 1615 dev_err(cdns->dev, "bus clock stop failed %d\n", ret); 1616 return ret; 1617 } 1618 1619 ret = cdns_set_wait(cdns, CDNS_MCP_STAT, 1620 CDNS_MCP_STAT_CLK_STOP, 1621 CDNS_MCP_STAT_CLK_STOP); 1622 if (ret < 0) 1623 dev_err(cdns->dev, "Clock stop failed %d\n", ret); 1624 1625 return ret; 1626 } 1627 EXPORT_SYMBOL(sdw_cdns_clock_stop); 1628 1629 /** 1630 * sdw_cdns_clock_restart: Cadence PM clock restart configuration routine 1631 * 1632 * @cdns: Cadence instance 1633 * @bus_reset: context may be lost while in low power modes and the bus 1634 * may require a Severe Reset and re-enumeration after a wake. 1635 */ 1636 int sdw_cdns_clock_restart(struct sdw_cdns *cdns, bool bus_reset) 1637 { 1638 int ret; 1639 1640 /* unmask Slave interrupts that were masked when stopping the clock */ 1641 cdns_enable_slave_interrupts(cdns, true); 1642 1643 ret = cdns_clear_bit(cdns, CDNS_MCP_CONTROL, 1644 CDNS_MCP_CONTROL_CLK_STOP_CLR); 1645 if (ret < 0) { 1646 dev_err(cdns->dev, "Couldn't exit from clock stop\n"); 1647 return ret; 1648 } 1649 1650 ret = cdns_set_wait(cdns, CDNS_MCP_STAT, CDNS_MCP_STAT_CLK_STOP, 0); 1651 if (ret < 0) { 1652 dev_err(cdns->dev, "clock stop exit failed %d\n", ret); 1653 return ret; 1654 } 1655 1656 cdns_updatel(cdns, CDNS_MCP_CONTROL, 1657 CDNS_MCP_CONTROL_BLOCK_WAKEUP, 0); 1658 1659 cdns_updatel(cdns, CDNS_MCP_CONTROL, CDNS_MCP_CONTROL_CMD_ACCEPT, 1660 CDNS_MCP_CONTROL_CMD_ACCEPT); 1661 1662 if (!bus_reset) { 1663 1664 /* enable bus operations with clock and data */ 1665 cdns_updatel(cdns, CDNS_MCP_CONFIG, 1666 CDNS_MCP_CONFIG_OP, 1667 CDNS_MCP_CONFIG_OP_NORMAL); 1668 1669 ret = cdns_config_update(cdns); 1670 if (ret < 0) { 1671 dev_err(cdns->dev, "%s: config_update failed\n", __func__); 1672 return ret; 1673 } 1674 1675 ret = sdw_bus_exit_clk_stop(&cdns->bus); 1676 if (ret < 0) 1677 dev_err(cdns->dev, "bus failed to exit clock stop %d\n", ret); 1678 } 1679 1680 return ret; 1681 } 1682 EXPORT_SYMBOL(sdw_cdns_clock_restart); 1683 1684 /** 1685 * sdw_cdns_probe() - Cadence probe routine 1686 * @cdns: Cadence instance 1687 */ 1688 int sdw_cdns_probe(struct sdw_cdns *cdns) 1689 { 1690 init_completion(&cdns->tx_complete); 1691 cdns->bus.port_ops = &cdns_port_ops; 1692 1693 INIT_WORK(&cdns->work, cdns_update_slave_status_work); 1694 return 0; 1695 } 1696 EXPORT_SYMBOL(sdw_cdns_probe); 1697 1698 int cdns_set_sdw_stream(struct snd_soc_dai *dai, 1699 void *stream, int direction) 1700 { 1701 struct sdw_cdns *cdns = snd_soc_dai_get_drvdata(dai); 1702 struct sdw_cdns_dma_data *dma; 1703 1704 if (stream) { 1705 /* first paranoia check */ 1706 if (direction == SNDRV_PCM_STREAM_PLAYBACK) 1707 dma = dai->playback_dma_data; 1708 else 1709 dma = dai->capture_dma_data; 1710 1711 if (dma) { 1712 dev_err(dai->dev, 1713 "dma_data already allocated for dai %s\n", 1714 dai->name); 1715 return -EINVAL; 1716 } 1717 1718 /* allocate and set dma info */ 1719 dma = kzalloc(sizeof(*dma), GFP_KERNEL); 1720 if (!dma) 1721 return -ENOMEM; 1722 1723 dma->stream_type = SDW_STREAM_PCM; 1724 1725 dma->bus = &cdns->bus; 1726 dma->link_id = cdns->instance; 1727 1728 dma->stream = stream; 1729 1730 if (direction == SNDRV_PCM_STREAM_PLAYBACK) 1731 dai->playback_dma_data = dma; 1732 else 1733 dai->capture_dma_data = dma; 1734 } else { 1735 /* for NULL stream we release allocated dma_data */ 1736 if (direction == SNDRV_PCM_STREAM_PLAYBACK) { 1737 kfree(dai->playback_dma_data); 1738 dai->playback_dma_data = NULL; 1739 } else { 1740 kfree(dai->capture_dma_data); 1741 dai->capture_dma_data = NULL; 1742 } 1743 } 1744 return 0; 1745 } 1746 EXPORT_SYMBOL(cdns_set_sdw_stream); 1747 1748 /** 1749 * cdns_find_pdi() - Find a free PDI 1750 * 1751 * @cdns: Cadence instance 1752 * @offset: Starting offset 1753 * @num: Number of PDIs 1754 * @pdi: PDI instances 1755 * @dai_id: DAI id 1756 * 1757 * Find a PDI for a given PDI array. The PDI num and dai_id are 1758 * expected to match, return NULL otherwise. 1759 */ 1760 static struct sdw_cdns_pdi *cdns_find_pdi(struct sdw_cdns *cdns, 1761 unsigned int offset, 1762 unsigned int num, 1763 struct sdw_cdns_pdi *pdi, 1764 int dai_id) 1765 { 1766 int i; 1767 1768 for (i = offset; i < offset + num; i++) 1769 if (pdi[i].num == dai_id) 1770 return &pdi[i]; 1771 1772 return NULL; 1773 } 1774 1775 /** 1776 * sdw_cdns_config_stream: Configure a stream 1777 * 1778 * @cdns: Cadence instance 1779 * @ch: Channel count 1780 * @dir: Data direction 1781 * @pdi: PDI to be used 1782 */ 1783 void sdw_cdns_config_stream(struct sdw_cdns *cdns, 1784 u32 ch, u32 dir, struct sdw_cdns_pdi *pdi) 1785 { 1786 u32 offset, val = 0; 1787 1788 if (dir == SDW_DATA_DIR_RX) { 1789 val = CDNS_PORTCTRL_DIRN; 1790 1791 if (cdns->bus.params.m_data_mode != SDW_PORT_DATA_MODE_NORMAL) 1792 val |= CDNS_PORTCTRL_TEST_FAILED; 1793 } 1794 offset = CDNS_PORTCTRL + pdi->num * CDNS_PORT_OFFSET; 1795 cdns_updatel(cdns, offset, 1796 CDNS_PORTCTRL_DIRN | CDNS_PORTCTRL_TEST_FAILED, 1797 val); 1798 1799 val = pdi->num; 1800 val |= CDNS_PDI_CONFIG_SOFT_RESET; 1801 val |= FIELD_PREP(CDNS_PDI_CONFIG_CHANNEL, (1 << ch) - 1); 1802 cdns_writel(cdns, CDNS_PDI_CONFIG(pdi->num), val); 1803 } 1804 EXPORT_SYMBOL(sdw_cdns_config_stream); 1805 1806 /** 1807 * sdw_cdns_alloc_pdi() - Allocate a PDI 1808 * 1809 * @cdns: Cadence instance 1810 * @stream: Stream to be allocated 1811 * @ch: Channel count 1812 * @dir: Data direction 1813 * @dai_id: DAI id 1814 */ 1815 struct sdw_cdns_pdi *sdw_cdns_alloc_pdi(struct sdw_cdns *cdns, 1816 struct sdw_cdns_streams *stream, 1817 u32 ch, u32 dir, int dai_id) 1818 { 1819 struct sdw_cdns_pdi *pdi = NULL; 1820 1821 if (dir == SDW_DATA_DIR_RX) 1822 pdi = cdns_find_pdi(cdns, 0, stream->num_in, stream->in, 1823 dai_id); 1824 else 1825 pdi = cdns_find_pdi(cdns, 0, stream->num_out, stream->out, 1826 dai_id); 1827 1828 /* check if we found a PDI, else find in bi-directional */ 1829 if (!pdi) 1830 pdi = cdns_find_pdi(cdns, 2, stream->num_bd, stream->bd, 1831 dai_id); 1832 1833 if (pdi) { 1834 pdi->l_ch_num = 0; 1835 pdi->h_ch_num = ch - 1; 1836 pdi->dir = dir; 1837 pdi->ch_count = ch; 1838 } 1839 1840 return pdi; 1841 } 1842 EXPORT_SYMBOL(sdw_cdns_alloc_pdi); 1843 1844 MODULE_LICENSE("Dual BSD/GPL"); 1845 MODULE_DESCRIPTION("Cadence Soundwire Library"); 1846