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 #define CDNS_MCP_CONFIG_BUS_REL BIT(6) 31 32 #define CDNS_IP_MCP_CONFIG 0x0 /* IP offset added at run-time */ 33 34 #define CDNS_IP_MCP_CONFIG_MCMD_RETRY GENMASK(27, 24) 35 #define CDNS_IP_MCP_CONFIG_MPREQ_DELAY GENMASK(20, 16) 36 #define CDNS_IP_MCP_CONFIG_MMASTER BIT(7) 37 #define CDNS_IP_MCP_CONFIG_SNIFFER BIT(5) 38 #define CDNS_IP_MCP_CONFIG_CMD BIT(3) 39 #define CDNS_IP_MCP_CONFIG_OP GENMASK(2, 0) 40 #define CDNS_IP_MCP_CONFIG_OP_NORMAL 0 41 42 #define CDNS_MCP_CONTROL 0x4 43 44 #define CDNS_MCP_CONTROL_CMD_RST BIT(7) 45 #define CDNS_MCP_CONTROL_SOFT_RST BIT(6) 46 #define CDNS_MCP_CONTROL_HW_RST BIT(4) 47 #define CDNS_MCP_CONTROL_CLK_STOP_CLR BIT(2) 48 49 #define CDNS_IP_MCP_CONTROL 0x4 /* IP offset added at run-time */ 50 51 #define CDNS_IP_MCP_CONTROL_RST_DELAY GENMASK(10, 8) 52 #define CDNS_IP_MCP_CONTROL_SW_RST BIT(5) 53 #define CDNS_IP_MCP_CONTROL_CLK_PAUSE BIT(3) 54 #define CDNS_IP_MCP_CONTROL_CMD_ACCEPT BIT(1) 55 #define CDNS_IP_MCP_CONTROL_BLOCK_WAKEUP BIT(0) 56 57 #define CDNS_IP_MCP_CMDCTRL 0x8 /* IP offset added at run-time */ 58 59 #define CDNS_IP_MCP_CMDCTRL_INSERT_PARITY_ERR BIT(2) 60 61 #define CDNS_MCP_SSPSTAT 0xC 62 #define CDNS_MCP_FRAME_SHAPE 0x10 63 #define CDNS_MCP_FRAME_SHAPE_INIT 0x14 64 #define CDNS_MCP_FRAME_SHAPE_COL_MASK GENMASK(2, 0) 65 #define CDNS_MCP_FRAME_SHAPE_ROW_MASK GENMASK(7, 3) 66 67 #define CDNS_MCP_CONFIG_UPDATE 0x18 68 #define CDNS_MCP_CONFIG_UPDATE_BIT BIT(0) 69 70 #define CDNS_MCP_PHYCTRL 0x1C 71 #define CDNS_MCP_SSP_CTRL0 0x20 72 #define CDNS_MCP_SSP_CTRL1 0x28 73 #define CDNS_MCP_CLK_CTRL0 0x30 74 #define CDNS_MCP_CLK_CTRL1 0x38 75 #define CDNS_MCP_CLK_MCLKD_MASK GENMASK(7, 0) 76 77 #define CDNS_MCP_STAT 0x40 78 79 #define CDNS_MCP_STAT_ACTIVE_BANK BIT(20) 80 #define CDNS_MCP_STAT_CLK_STOP BIT(16) 81 82 #define CDNS_MCP_INTSTAT 0x44 83 #define CDNS_MCP_INTMASK 0x48 84 85 #define CDNS_MCP_INT_IRQ BIT(31) 86 #define CDNS_MCP_INT_RESERVED1 GENMASK(30, 17) 87 #define CDNS_MCP_INT_WAKEUP BIT(16) 88 #define CDNS_MCP_INT_SLAVE_RSVD BIT(15) 89 #define CDNS_MCP_INT_SLAVE_ALERT BIT(14) 90 #define CDNS_MCP_INT_SLAVE_ATTACH BIT(13) 91 #define CDNS_MCP_INT_SLAVE_NATTACH BIT(12) 92 #define CDNS_MCP_INT_SLAVE_MASK GENMASK(15, 12) 93 #define CDNS_MCP_INT_DPINT BIT(11) 94 #define CDNS_MCP_INT_CTRL_CLASH BIT(10) 95 #define CDNS_MCP_INT_DATA_CLASH BIT(9) 96 #define CDNS_MCP_INT_PARITY BIT(8) 97 #define CDNS_MCP_INT_CMD_ERR BIT(7) 98 #define CDNS_MCP_INT_RESERVED2 GENMASK(6, 4) 99 #define CDNS_MCP_INT_RX_NE BIT(3) 100 #define CDNS_MCP_INT_RX_WL BIT(2) 101 #define CDNS_MCP_INT_TXE BIT(1) 102 #define CDNS_MCP_INT_TXF BIT(0) 103 #define CDNS_MCP_INT_RESERVED (CDNS_MCP_INT_RESERVED1 | CDNS_MCP_INT_RESERVED2) 104 105 #define CDNS_MCP_INTSET 0x4C 106 107 #define CDNS_MCP_SLAVE_STAT 0x50 108 #define CDNS_MCP_SLAVE_STAT_MASK GENMASK(1, 0) 109 110 #define CDNS_MCP_SLAVE_INTSTAT0 0x54 111 #define CDNS_MCP_SLAVE_INTSTAT1 0x58 112 #define CDNS_MCP_SLAVE_INTSTAT_NPRESENT BIT(0) 113 #define CDNS_MCP_SLAVE_INTSTAT_ATTACHED BIT(1) 114 #define CDNS_MCP_SLAVE_INTSTAT_ALERT BIT(2) 115 #define CDNS_MCP_SLAVE_INTSTAT_RESERVED BIT(3) 116 #define CDNS_MCP_SLAVE_STATUS_BITS GENMASK(3, 0) 117 #define CDNS_MCP_SLAVE_STATUS_NUM 4 118 119 #define CDNS_MCP_SLAVE_INTMASK0 0x5C 120 #define CDNS_MCP_SLAVE_INTMASK1 0x60 121 122 #define CDNS_MCP_SLAVE_INTMASK0_MASK GENMASK(31, 0) 123 #define CDNS_MCP_SLAVE_INTMASK1_MASK GENMASK(15, 0) 124 125 #define CDNS_MCP_PORT_INTSTAT 0x64 126 #define CDNS_MCP_PDI_STAT 0x6C 127 128 #define CDNS_MCP_FIFOLEVEL 0x78 129 #define CDNS_MCP_FIFOSTAT 0x7C 130 #define CDNS_MCP_RX_FIFO_AVAIL GENMASK(5, 0) 131 132 #define CDNS_IP_MCP_CMD_BASE 0x80 /* IP offset added at run-time */ 133 #define CDNS_IP_MCP_RESP_BASE 0x80 /* IP offset added at run-time */ 134 /* FIFO can hold 8 commands */ 135 #define CDNS_MCP_CMD_LEN 8 136 #define CDNS_MCP_CMD_WORD_LEN 0x4 137 138 #define CDNS_MCP_CMD_SSP_TAG BIT(31) 139 #define CDNS_MCP_CMD_COMMAND GENMASK(30, 28) 140 #define CDNS_MCP_CMD_DEV_ADDR GENMASK(27, 24) 141 #define CDNS_MCP_CMD_REG_ADDR GENMASK(23, 8) 142 #define CDNS_MCP_CMD_REG_DATA GENMASK(7, 0) 143 144 #define CDNS_MCP_CMD_READ 2 145 #define CDNS_MCP_CMD_WRITE 3 146 147 #define CDNS_MCP_RESP_RDATA GENMASK(15, 8) 148 #define CDNS_MCP_RESP_ACK BIT(0) 149 #define CDNS_MCP_RESP_NACK BIT(1) 150 151 #define CDNS_DP_SIZE 128 152 153 #define CDNS_DPN_B0_CONFIG(n) (0x100 + CDNS_DP_SIZE * (n)) 154 #define CDNS_DPN_B0_CH_EN(n) (0x104 + CDNS_DP_SIZE * (n)) 155 #define CDNS_DPN_B0_SAMPLE_CTRL(n) (0x108 + CDNS_DP_SIZE * (n)) 156 #define CDNS_DPN_B0_OFFSET_CTRL(n) (0x10C + CDNS_DP_SIZE * (n)) 157 #define CDNS_DPN_B0_HCTRL(n) (0x110 + CDNS_DP_SIZE * (n)) 158 #define CDNS_DPN_B0_ASYNC_CTRL(n) (0x114 + CDNS_DP_SIZE * (n)) 159 160 #define CDNS_DPN_B1_CONFIG(n) (0x118 + CDNS_DP_SIZE * (n)) 161 #define CDNS_DPN_B1_CH_EN(n) (0x11C + CDNS_DP_SIZE * (n)) 162 #define CDNS_DPN_B1_SAMPLE_CTRL(n) (0x120 + CDNS_DP_SIZE * (n)) 163 #define CDNS_DPN_B1_OFFSET_CTRL(n) (0x124 + CDNS_DP_SIZE * (n)) 164 #define CDNS_DPN_B1_HCTRL(n) (0x128 + CDNS_DP_SIZE * (n)) 165 #define CDNS_DPN_B1_ASYNC_CTRL(n) (0x12C + CDNS_DP_SIZE * (n)) 166 167 #define CDNS_DPN_CONFIG_BPM BIT(18) 168 #define CDNS_DPN_CONFIG_BGC GENMASK(17, 16) 169 #define CDNS_DPN_CONFIG_WL GENMASK(12, 8) 170 #define CDNS_DPN_CONFIG_PORT_DAT GENMASK(3, 2) 171 #define CDNS_DPN_CONFIG_PORT_FLOW GENMASK(1, 0) 172 173 #define CDNS_DPN_SAMPLE_CTRL_SI GENMASK(15, 0) 174 175 #define CDNS_DPN_OFFSET_CTRL_1 GENMASK(7, 0) 176 #define CDNS_DPN_OFFSET_CTRL_2 GENMASK(15, 8) 177 178 #define CDNS_DPN_HCTRL_HSTOP GENMASK(3, 0) 179 #define CDNS_DPN_HCTRL_HSTART GENMASK(7, 4) 180 #define CDNS_DPN_HCTRL_LCTRL GENMASK(10, 8) 181 182 #define CDNS_PORTCTRL 0x130 183 #define CDNS_PORTCTRL_TEST_FAILED BIT(1) 184 #define CDNS_PORTCTRL_DIRN BIT(7) 185 #define CDNS_PORTCTRL_BANK_INVERT BIT(8) 186 187 #define CDNS_PORT_OFFSET 0x80 188 189 #define CDNS_PDI_CONFIG(n) (0x1100 + (n) * 16) 190 191 #define CDNS_PDI_CONFIG_SOFT_RESET BIT(24) 192 #define CDNS_PDI_CONFIG_CHANNEL GENMASK(15, 8) 193 #define CDNS_PDI_CONFIG_PORT GENMASK(4, 0) 194 195 /* Driver defaults */ 196 #define CDNS_TX_TIMEOUT 500 197 198 #define CDNS_SCP_RX_FIFOLEVEL 0x2 199 200 /* 201 * register accessor helpers 202 */ 203 static inline u32 cdns_readl(struct sdw_cdns *cdns, int offset) 204 { 205 return readl(cdns->registers + offset); 206 } 207 208 static inline void cdns_writel(struct sdw_cdns *cdns, int offset, u32 value) 209 { 210 writel(value, cdns->registers + offset); 211 } 212 213 static inline u32 cdns_ip_readl(struct sdw_cdns *cdns, int offset) 214 { 215 return cdns_readl(cdns, cdns->ip_offset + offset); 216 } 217 218 static inline void cdns_ip_writel(struct sdw_cdns *cdns, int offset, u32 value) 219 { 220 return cdns_writel(cdns, cdns->ip_offset + offset, value); 221 } 222 223 static inline void cdns_updatel(struct sdw_cdns *cdns, 224 int offset, u32 mask, u32 val) 225 { 226 u32 tmp; 227 228 tmp = cdns_readl(cdns, offset); 229 tmp = (tmp & ~mask) | val; 230 cdns_writel(cdns, offset, tmp); 231 } 232 233 static inline void cdns_ip_updatel(struct sdw_cdns *cdns, 234 int offset, u32 mask, u32 val) 235 { 236 cdns_updatel(cdns, cdns->ip_offset + offset, mask, val); 237 } 238 239 static int cdns_set_wait(struct sdw_cdns *cdns, int offset, u32 mask, u32 value) 240 { 241 int timeout = 10; 242 u32 reg_read; 243 244 /* Wait for bit to be set */ 245 do { 246 reg_read = readl(cdns->registers + offset); 247 if ((reg_read & mask) == value) 248 return 0; 249 250 timeout--; 251 usleep_range(50, 100); 252 } while (timeout != 0); 253 254 return -ETIMEDOUT; 255 } 256 257 static int cdns_clear_bit(struct sdw_cdns *cdns, int offset, u32 value) 258 { 259 writel(value, cdns->registers + offset); 260 261 /* Wait for bit to be self cleared */ 262 return cdns_set_wait(cdns, offset, value, 0); 263 } 264 265 /* 266 * all changes to the MCP_CONFIG, MCP_CONTROL, MCP_CMDCTRL and MCP_PHYCTRL 267 * need to be confirmed with a write to MCP_CONFIG_UPDATE 268 */ 269 static int cdns_config_update(struct sdw_cdns *cdns) 270 { 271 int ret; 272 273 if (sdw_cdns_is_clock_stop(cdns)) { 274 dev_err(cdns->dev, "Cannot program MCP_CONFIG_UPDATE in ClockStopMode\n"); 275 return -EINVAL; 276 } 277 278 ret = cdns_clear_bit(cdns, CDNS_MCP_CONFIG_UPDATE, 279 CDNS_MCP_CONFIG_UPDATE_BIT); 280 if (ret < 0) 281 dev_err(cdns->dev, "Config update timedout\n"); 282 283 return ret; 284 } 285 286 /* 287 * debugfs 288 */ 289 #ifdef CONFIG_DEBUG_FS 290 291 #define RD_BUF (2 * PAGE_SIZE) 292 293 static ssize_t cdns_sprintf(struct sdw_cdns *cdns, 294 char *buf, size_t pos, unsigned int reg) 295 { 296 return scnprintf(buf + pos, RD_BUF - pos, 297 "%4x\t%8x\n", reg, cdns_readl(cdns, reg)); 298 } 299 300 static int cdns_reg_show(struct seq_file *s, void *data) 301 { 302 struct sdw_cdns *cdns = s->private; 303 char *buf; 304 ssize_t ret; 305 int num_ports; 306 int i, j; 307 308 buf = kzalloc(RD_BUF, GFP_KERNEL); 309 if (!buf) 310 return -ENOMEM; 311 312 ret = scnprintf(buf, RD_BUF, "Register Value\n"); 313 ret += scnprintf(buf + ret, RD_BUF - ret, "\nMCP Registers\n"); 314 /* 8 MCP registers */ 315 for (i = CDNS_MCP_CONFIG; i <= CDNS_MCP_PHYCTRL; i += sizeof(u32)) 316 ret += cdns_sprintf(cdns, buf, ret, i); 317 318 ret += scnprintf(buf + ret, RD_BUF - ret, 319 "\nStatus & Intr Registers\n"); 320 /* 13 Status & Intr registers (offsets 0x70 and 0x74 not defined) */ 321 for (i = CDNS_MCP_STAT; i <= CDNS_MCP_FIFOSTAT; i += sizeof(u32)) 322 ret += cdns_sprintf(cdns, buf, ret, i); 323 324 ret += scnprintf(buf + ret, RD_BUF - ret, 325 "\nSSP & Clk ctrl Registers\n"); 326 ret += cdns_sprintf(cdns, buf, ret, CDNS_MCP_SSP_CTRL0); 327 ret += cdns_sprintf(cdns, buf, ret, CDNS_MCP_SSP_CTRL1); 328 ret += cdns_sprintf(cdns, buf, ret, CDNS_MCP_CLK_CTRL0); 329 ret += cdns_sprintf(cdns, buf, ret, CDNS_MCP_CLK_CTRL1); 330 331 ret += scnprintf(buf + ret, RD_BUF - ret, 332 "\nDPn B0 Registers\n"); 333 334 num_ports = cdns->num_ports; 335 336 for (i = 0; i < num_ports; i++) { 337 ret += scnprintf(buf + ret, RD_BUF - ret, 338 "\nDP-%d\n", i); 339 for (j = CDNS_DPN_B0_CONFIG(i); 340 j < CDNS_DPN_B0_ASYNC_CTRL(i); j += sizeof(u32)) 341 ret += cdns_sprintf(cdns, buf, ret, j); 342 } 343 344 ret += scnprintf(buf + ret, RD_BUF - ret, 345 "\nDPn B1 Registers\n"); 346 for (i = 0; i < num_ports; i++) { 347 ret += scnprintf(buf + ret, RD_BUF - ret, 348 "\nDP-%d\n", i); 349 350 for (j = CDNS_DPN_B1_CONFIG(i); 351 j < CDNS_DPN_B1_ASYNC_CTRL(i); j += sizeof(u32)) 352 ret += cdns_sprintf(cdns, buf, ret, j); 353 } 354 355 ret += scnprintf(buf + ret, RD_BUF - ret, 356 "\nDPn Control Registers\n"); 357 for (i = 0; i < num_ports; i++) 358 ret += cdns_sprintf(cdns, buf, ret, 359 CDNS_PORTCTRL + i * CDNS_PORT_OFFSET); 360 361 ret += scnprintf(buf + ret, RD_BUF - ret, 362 "\nPDIn Config Registers\n"); 363 364 /* number of PDI and ports is interchangeable */ 365 for (i = 0; i < num_ports; i++) 366 ret += cdns_sprintf(cdns, buf, ret, CDNS_PDI_CONFIG(i)); 367 368 seq_printf(s, "%s", buf); 369 kfree(buf); 370 371 return 0; 372 } 373 DEFINE_SHOW_ATTRIBUTE(cdns_reg); 374 375 static int cdns_hw_reset(void *data, u64 value) 376 { 377 struct sdw_cdns *cdns = data; 378 int ret; 379 380 if (value != 1) 381 return -EINVAL; 382 383 /* Userspace changed the hardware state behind the kernel's back */ 384 add_taint(TAINT_USER, LOCKDEP_STILL_OK); 385 386 ret = sdw_cdns_exit_reset(cdns); 387 388 dev_dbg(cdns->dev, "link hw_reset done: %d\n", ret); 389 390 return ret; 391 } 392 393 DEFINE_DEBUGFS_ATTRIBUTE(cdns_hw_reset_fops, NULL, cdns_hw_reset, "%llu\n"); 394 395 static int cdns_parity_error_injection(void *data, u64 value) 396 { 397 struct sdw_cdns *cdns = data; 398 struct sdw_bus *bus; 399 int ret; 400 401 if (value != 1) 402 return -EINVAL; 403 404 bus = &cdns->bus; 405 406 /* 407 * Resume Master device. If this results in a bus reset, the 408 * Slave devices will re-attach and be re-enumerated. 409 */ 410 ret = pm_runtime_resume_and_get(bus->dev); 411 if (ret < 0 && ret != -EACCES) { 412 dev_err_ratelimited(cdns->dev, 413 "pm_runtime_resume_and_get failed in %s, ret %d\n", 414 __func__, ret); 415 return ret; 416 } 417 418 /* 419 * wait long enough for Slave(s) to be in steady state. This 420 * does not need to be super precise. 421 */ 422 msleep(200); 423 424 /* 425 * Take the bus lock here to make sure that any bus transactions 426 * will be queued while we inject a parity error on a dummy read 427 */ 428 mutex_lock(&bus->bus_lock); 429 430 /* program hardware to inject parity error */ 431 cdns_ip_updatel(cdns, CDNS_IP_MCP_CMDCTRL, 432 CDNS_IP_MCP_CMDCTRL_INSERT_PARITY_ERR, 433 CDNS_IP_MCP_CMDCTRL_INSERT_PARITY_ERR); 434 435 /* commit changes */ 436 cdns_updatel(cdns, CDNS_MCP_CONFIG_UPDATE, 437 CDNS_MCP_CONFIG_UPDATE_BIT, 438 CDNS_MCP_CONFIG_UPDATE_BIT); 439 440 /* do a broadcast dummy read to avoid bus clashes */ 441 ret = sdw_bread_no_pm_unlocked(&cdns->bus, 0xf, SDW_SCP_DEVID_0); 442 dev_info(cdns->dev, "parity error injection, read: %d\n", ret); 443 444 /* program hardware to disable parity error */ 445 cdns_ip_updatel(cdns, CDNS_IP_MCP_CMDCTRL, 446 CDNS_IP_MCP_CMDCTRL_INSERT_PARITY_ERR, 447 0); 448 449 /* commit changes */ 450 cdns_updatel(cdns, CDNS_MCP_CONFIG_UPDATE, 451 CDNS_MCP_CONFIG_UPDATE_BIT, 452 CDNS_MCP_CONFIG_UPDATE_BIT); 453 454 /* Continue bus operation with parity error injection disabled */ 455 mutex_unlock(&bus->bus_lock); 456 457 /* Userspace changed the hardware state behind the kernel's back */ 458 add_taint(TAINT_USER, LOCKDEP_STILL_OK); 459 460 /* 461 * allow Master device to enter pm_runtime suspend. This may 462 * also result in Slave devices suspending. 463 */ 464 pm_runtime_mark_last_busy(bus->dev); 465 pm_runtime_put_autosuspend(bus->dev); 466 467 return 0; 468 } 469 470 DEFINE_DEBUGFS_ATTRIBUTE(cdns_parity_error_fops, NULL, 471 cdns_parity_error_injection, "%llu\n"); 472 473 static int cdns_set_pdi_loopback_source(void *data, u64 value) 474 { 475 struct sdw_cdns *cdns = data; 476 unsigned int pdi_out_num = cdns->pcm.num_bd + cdns->pcm.num_out; 477 478 if (value > pdi_out_num) 479 return -EINVAL; 480 481 /* Userspace changed the hardware state behind the kernel's back */ 482 add_taint(TAINT_USER, LOCKDEP_STILL_OK); 483 484 cdns->pdi_loopback_source = value; 485 486 return 0; 487 } 488 DEFINE_DEBUGFS_ATTRIBUTE(cdns_pdi_loopback_source_fops, NULL, cdns_set_pdi_loopback_source, "%llu\n"); 489 490 static int cdns_set_pdi_loopback_target(void *data, u64 value) 491 { 492 struct sdw_cdns *cdns = data; 493 unsigned int pdi_in_num = cdns->pcm.num_bd + cdns->pcm.num_in; 494 495 if (value > pdi_in_num) 496 return -EINVAL; 497 498 /* Userspace changed the hardware state behind the kernel's back */ 499 add_taint(TAINT_USER, LOCKDEP_STILL_OK); 500 501 cdns->pdi_loopback_target = value; 502 503 return 0; 504 } 505 DEFINE_DEBUGFS_ATTRIBUTE(cdns_pdi_loopback_target_fops, NULL, cdns_set_pdi_loopback_target, "%llu\n"); 506 507 /** 508 * sdw_cdns_debugfs_init() - Cadence debugfs init 509 * @cdns: Cadence instance 510 * @root: debugfs root 511 */ 512 void sdw_cdns_debugfs_init(struct sdw_cdns *cdns, struct dentry *root) 513 { 514 debugfs_create_file("cdns-registers", 0400, root, cdns, &cdns_reg_fops); 515 516 debugfs_create_file("cdns-hw-reset", 0200, root, cdns, 517 &cdns_hw_reset_fops); 518 519 debugfs_create_file("cdns-parity-error-injection", 0200, root, cdns, 520 &cdns_parity_error_fops); 521 522 cdns->pdi_loopback_source = -1; 523 cdns->pdi_loopback_target = -1; 524 525 debugfs_create_file("cdns-pdi-loopback-source", 0200, root, cdns, 526 &cdns_pdi_loopback_source_fops); 527 528 debugfs_create_file("cdns-pdi-loopback-target", 0200, root, cdns, 529 &cdns_pdi_loopback_target_fops); 530 531 } 532 EXPORT_SYMBOL_GPL(sdw_cdns_debugfs_init); 533 534 #endif /* CONFIG_DEBUG_FS */ 535 536 /* 537 * IO Calls 538 */ 539 static enum sdw_command_response 540 cdns_fill_msg_resp(struct sdw_cdns *cdns, 541 struct sdw_msg *msg, int count, int offset) 542 { 543 int nack = 0, no_ack = 0; 544 int i; 545 546 /* check message response */ 547 for (i = 0; i < count; i++) { 548 if (!(cdns->response_buf[i] & CDNS_MCP_RESP_ACK)) { 549 no_ack = 1; 550 dev_vdbg(cdns->dev, "Msg Ack not received, cmd %d\n", i); 551 } 552 if (cdns->response_buf[i] & CDNS_MCP_RESP_NACK) { 553 nack = 1; 554 dev_err_ratelimited(cdns->dev, "Msg NACK received, cmd %d\n", i); 555 } 556 } 557 558 if (nack) { 559 dev_err_ratelimited(cdns->dev, "Msg NACKed for Slave %d\n", msg->dev_num); 560 return SDW_CMD_FAIL; 561 } 562 563 if (no_ack) { 564 dev_dbg_ratelimited(cdns->dev, "Msg ignored for Slave %d\n", msg->dev_num); 565 return SDW_CMD_IGNORED; 566 } 567 568 if (msg->flags == SDW_MSG_FLAG_READ) { 569 /* fill response */ 570 for (i = 0; i < count; i++) 571 msg->buf[i + offset] = FIELD_GET(CDNS_MCP_RESP_RDATA, 572 cdns->response_buf[i]); 573 } 574 575 return SDW_CMD_OK; 576 } 577 578 static void cdns_read_response(struct sdw_cdns *cdns) 579 { 580 u32 num_resp, cmd_base; 581 int i; 582 583 /* RX_FIFO_AVAIL can be 2 entries more than the FIFO size */ 584 BUILD_BUG_ON(ARRAY_SIZE(cdns->response_buf) < CDNS_MCP_CMD_LEN + 2); 585 586 num_resp = cdns_readl(cdns, CDNS_MCP_FIFOSTAT); 587 num_resp &= CDNS_MCP_RX_FIFO_AVAIL; 588 if (num_resp > ARRAY_SIZE(cdns->response_buf)) { 589 dev_warn(cdns->dev, "RX AVAIL %d too long\n", num_resp); 590 num_resp = ARRAY_SIZE(cdns->response_buf); 591 } 592 593 cmd_base = CDNS_IP_MCP_CMD_BASE; 594 595 for (i = 0; i < num_resp; i++) { 596 cdns->response_buf[i] = cdns_ip_readl(cdns, cmd_base); 597 cmd_base += CDNS_MCP_CMD_WORD_LEN; 598 } 599 } 600 601 static enum sdw_command_response 602 _cdns_xfer_msg(struct sdw_cdns *cdns, struct sdw_msg *msg, int cmd, 603 int offset, int count, bool defer) 604 { 605 unsigned long time; 606 u32 base, i, data; 607 u16 addr; 608 609 /* Program the watermark level for RX FIFO */ 610 if (cdns->msg_count != count) { 611 cdns_writel(cdns, CDNS_MCP_FIFOLEVEL, count); 612 cdns->msg_count = count; 613 } 614 615 base = CDNS_IP_MCP_CMD_BASE; 616 addr = msg->addr + offset; 617 618 for (i = 0; i < count; i++) { 619 data = FIELD_PREP(CDNS_MCP_CMD_DEV_ADDR, msg->dev_num); 620 data |= FIELD_PREP(CDNS_MCP_CMD_COMMAND, cmd); 621 data |= FIELD_PREP(CDNS_MCP_CMD_REG_ADDR, addr); 622 addr++; 623 624 if (msg->flags == SDW_MSG_FLAG_WRITE) 625 data |= msg->buf[i + offset]; 626 627 data |= FIELD_PREP(CDNS_MCP_CMD_SSP_TAG, msg->ssp_sync); 628 cdns_ip_writel(cdns, base, data); 629 base += CDNS_MCP_CMD_WORD_LEN; 630 } 631 632 if (defer) 633 return SDW_CMD_OK; 634 635 /* wait for timeout or response */ 636 time = wait_for_completion_timeout(&cdns->tx_complete, 637 msecs_to_jiffies(CDNS_TX_TIMEOUT)); 638 if (!time) { 639 dev_err(cdns->dev, "IO transfer timed out, cmd %d device %d addr %x len %d\n", 640 cmd, msg->dev_num, msg->addr, msg->len); 641 msg->len = 0; 642 643 /* Drain anything in the RX_FIFO */ 644 cdns_read_response(cdns); 645 646 return SDW_CMD_TIMEOUT; 647 } 648 649 return cdns_fill_msg_resp(cdns, msg, count, offset); 650 } 651 652 static enum sdw_command_response 653 cdns_program_scp_addr(struct sdw_cdns *cdns, struct sdw_msg *msg) 654 { 655 int nack = 0, no_ack = 0; 656 unsigned long time; 657 u32 data[2], base; 658 int i; 659 660 /* Program the watermark level for RX FIFO */ 661 if (cdns->msg_count != CDNS_SCP_RX_FIFOLEVEL) { 662 cdns_writel(cdns, CDNS_MCP_FIFOLEVEL, CDNS_SCP_RX_FIFOLEVEL); 663 cdns->msg_count = CDNS_SCP_RX_FIFOLEVEL; 664 } 665 666 data[0] = FIELD_PREP(CDNS_MCP_CMD_DEV_ADDR, msg->dev_num); 667 data[0] |= FIELD_PREP(CDNS_MCP_CMD_COMMAND, 0x3); 668 data[1] = data[0]; 669 670 data[0] |= FIELD_PREP(CDNS_MCP_CMD_REG_ADDR, SDW_SCP_ADDRPAGE1); 671 data[1] |= FIELD_PREP(CDNS_MCP_CMD_REG_ADDR, SDW_SCP_ADDRPAGE2); 672 673 data[0] |= msg->addr_page1; 674 data[1] |= msg->addr_page2; 675 676 base = CDNS_IP_MCP_CMD_BASE; 677 cdns_ip_writel(cdns, base, data[0]); 678 base += CDNS_MCP_CMD_WORD_LEN; 679 cdns_ip_writel(cdns, base, data[1]); 680 681 time = wait_for_completion_timeout(&cdns->tx_complete, 682 msecs_to_jiffies(CDNS_TX_TIMEOUT)); 683 if (!time) { 684 dev_err(cdns->dev, "SCP Msg trf timed out\n"); 685 msg->len = 0; 686 return SDW_CMD_TIMEOUT; 687 } 688 689 /* check response the writes */ 690 for (i = 0; i < 2; i++) { 691 if (!(cdns->response_buf[i] & CDNS_MCP_RESP_ACK)) { 692 no_ack = 1; 693 dev_err(cdns->dev, "Program SCP Ack not received\n"); 694 if (cdns->response_buf[i] & CDNS_MCP_RESP_NACK) { 695 nack = 1; 696 dev_err(cdns->dev, "Program SCP NACK received\n"); 697 } 698 } 699 } 700 701 /* For NACK, NO ack, don't return err if we are in Broadcast mode */ 702 if (nack) { 703 dev_err_ratelimited(cdns->dev, 704 "SCP_addrpage NACKed for Slave %d\n", msg->dev_num); 705 return SDW_CMD_FAIL; 706 } 707 708 if (no_ack) { 709 dev_dbg_ratelimited(cdns->dev, 710 "SCP_addrpage ignored for Slave %d\n", msg->dev_num); 711 return SDW_CMD_IGNORED; 712 } 713 714 return SDW_CMD_OK; 715 } 716 717 static int cdns_prep_msg(struct sdw_cdns *cdns, struct sdw_msg *msg, int *cmd) 718 { 719 int ret; 720 721 if (msg->page) { 722 ret = cdns_program_scp_addr(cdns, msg); 723 if (ret) { 724 msg->len = 0; 725 return ret; 726 } 727 } 728 729 switch (msg->flags) { 730 case SDW_MSG_FLAG_READ: 731 *cmd = CDNS_MCP_CMD_READ; 732 break; 733 734 case SDW_MSG_FLAG_WRITE: 735 *cmd = CDNS_MCP_CMD_WRITE; 736 break; 737 738 default: 739 dev_err(cdns->dev, "Invalid msg cmd: %d\n", msg->flags); 740 return -EINVAL; 741 } 742 743 return 0; 744 } 745 746 enum sdw_command_response 747 cdns_xfer_msg(struct sdw_bus *bus, struct sdw_msg *msg) 748 { 749 struct sdw_cdns *cdns = bus_to_cdns(bus); 750 int cmd = 0, ret, i; 751 752 ret = cdns_prep_msg(cdns, msg, &cmd); 753 if (ret) 754 return SDW_CMD_FAIL_OTHER; 755 756 for (i = 0; i < msg->len / CDNS_MCP_CMD_LEN; i++) { 757 ret = _cdns_xfer_msg(cdns, msg, cmd, i * CDNS_MCP_CMD_LEN, 758 CDNS_MCP_CMD_LEN, false); 759 if (ret != SDW_CMD_OK) 760 return ret; 761 } 762 763 if (!(msg->len % CDNS_MCP_CMD_LEN)) 764 return SDW_CMD_OK; 765 766 return _cdns_xfer_msg(cdns, msg, cmd, i * CDNS_MCP_CMD_LEN, 767 msg->len % CDNS_MCP_CMD_LEN, false); 768 } 769 EXPORT_SYMBOL(cdns_xfer_msg); 770 771 enum sdw_command_response 772 cdns_xfer_msg_defer(struct sdw_bus *bus) 773 { 774 struct sdw_cdns *cdns = bus_to_cdns(bus); 775 struct sdw_defer *defer = &bus->defer_msg; 776 struct sdw_msg *msg = defer->msg; 777 int cmd = 0, ret; 778 779 /* for defer only 1 message is supported */ 780 if (msg->len > 1) 781 return -ENOTSUPP; 782 783 ret = cdns_prep_msg(cdns, msg, &cmd); 784 if (ret) 785 return SDW_CMD_FAIL_OTHER; 786 787 return _cdns_xfer_msg(cdns, msg, cmd, 0, msg->len, true); 788 } 789 EXPORT_SYMBOL(cdns_xfer_msg_defer); 790 791 u32 cdns_read_ping_status(struct sdw_bus *bus) 792 { 793 struct sdw_cdns *cdns = bus_to_cdns(bus); 794 795 return cdns_readl(cdns, CDNS_MCP_SLAVE_STAT); 796 } 797 EXPORT_SYMBOL(cdns_read_ping_status); 798 799 /* 800 * IRQ handling 801 */ 802 803 static int cdns_update_slave_status(struct sdw_cdns *cdns, 804 u64 slave_intstat) 805 { 806 enum sdw_slave_status status[SDW_MAX_DEVICES + 1]; 807 bool is_slave = false; 808 u32 mask; 809 u32 val; 810 int i, set_status; 811 812 memset(status, 0, sizeof(status)); 813 814 for (i = 0; i <= SDW_MAX_DEVICES; i++) { 815 mask = (slave_intstat >> (i * CDNS_MCP_SLAVE_STATUS_NUM)) & 816 CDNS_MCP_SLAVE_STATUS_BITS; 817 818 set_status = 0; 819 820 if (mask) { 821 is_slave = true; 822 823 if (mask & CDNS_MCP_SLAVE_INTSTAT_RESERVED) { 824 status[i] = SDW_SLAVE_RESERVED; 825 set_status++; 826 } 827 828 if (mask & CDNS_MCP_SLAVE_INTSTAT_ATTACHED) { 829 status[i] = SDW_SLAVE_ATTACHED; 830 set_status++; 831 } 832 833 if (mask & CDNS_MCP_SLAVE_INTSTAT_ALERT) { 834 status[i] = SDW_SLAVE_ALERT; 835 set_status++; 836 } 837 838 if (mask & CDNS_MCP_SLAVE_INTSTAT_NPRESENT) { 839 status[i] = SDW_SLAVE_UNATTACHED; 840 set_status++; 841 } 842 } 843 844 /* 845 * check that there was a single reported Slave status and when 846 * there is not use the latest status extracted from PING commands 847 */ 848 if (set_status != 1) { 849 val = cdns_readl(cdns, CDNS_MCP_SLAVE_STAT); 850 val >>= (i * 2); 851 852 switch (val & 0x3) { 853 case 0: 854 status[i] = SDW_SLAVE_UNATTACHED; 855 break; 856 case 1: 857 status[i] = SDW_SLAVE_ATTACHED; 858 break; 859 case 2: 860 status[i] = SDW_SLAVE_ALERT; 861 break; 862 case 3: 863 default: 864 status[i] = SDW_SLAVE_RESERVED; 865 break; 866 } 867 } 868 } 869 870 if (is_slave) 871 return sdw_handle_slave_status(&cdns->bus, status); 872 873 return 0; 874 } 875 876 /** 877 * sdw_cdns_irq() - Cadence interrupt handler 878 * @irq: irq number 879 * @dev_id: irq context 880 */ 881 irqreturn_t sdw_cdns_irq(int irq, void *dev_id) 882 { 883 struct sdw_cdns *cdns = dev_id; 884 u32 int_status; 885 886 /* Check if the link is up */ 887 if (!cdns->link_up) 888 return IRQ_NONE; 889 890 int_status = cdns_readl(cdns, CDNS_MCP_INTSTAT); 891 892 /* check for reserved values read as zero */ 893 if (int_status & CDNS_MCP_INT_RESERVED) 894 return IRQ_NONE; 895 896 if (!(int_status & CDNS_MCP_INT_IRQ)) 897 return IRQ_NONE; 898 899 if (int_status & CDNS_MCP_INT_RX_WL) { 900 struct sdw_bus *bus = &cdns->bus; 901 struct sdw_defer *defer = &bus->defer_msg; 902 903 cdns_read_response(cdns); 904 905 if (defer && defer->msg) { 906 cdns_fill_msg_resp(cdns, defer->msg, 907 defer->length, 0); 908 complete(&defer->complete); 909 } else { 910 complete(&cdns->tx_complete); 911 } 912 } 913 914 if (int_status & CDNS_MCP_INT_PARITY) { 915 /* Parity error detected by Master */ 916 dev_err_ratelimited(cdns->dev, "Parity error\n"); 917 } 918 919 if (int_status & CDNS_MCP_INT_CTRL_CLASH) { 920 /* Slave is driving bit slot during control word */ 921 dev_err_ratelimited(cdns->dev, "Bus clash for control word\n"); 922 } 923 924 if (int_status & CDNS_MCP_INT_DATA_CLASH) { 925 /* 926 * Multiple slaves trying to drive bit slot, or issue with 927 * ownership of data bits or Slave gone bonkers 928 */ 929 dev_err_ratelimited(cdns->dev, "Bus clash for data word\n"); 930 } 931 932 if (cdns->bus.params.m_data_mode != SDW_PORT_DATA_MODE_NORMAL && 933 int_status & CDNS_MCP_INT_DPINT) { 934 u32 port_intstat; 935 936 /* just log which ports report an error */ 937 port_intstat = cdns_readl(cdns, CDNS_MCP_PORT_INTSTAT); 938 dev_err_ratelimited(cdns->dev, "DP interrupt: PortIntStat %8x\n", 939 port_intstat); 940 941 /* clear status w/ write1 */ 942 cdns_writel(cdns, CDNS_MCP_PORT_INTSTAT, port_intstat); 943 } 944 945 if (int_status & CDNS_MCP_INT_SLAVE_MASK) { 946 /* Mask the Slave interrupt and wake thread */ 947 cdns_updatel(cdns, CDNS_MCP_INTMASK, 948 CDNS_MCP_INT_SLAVE_MASK, 0); 949 950 int_status &= ~CDNS_MCP_INT_SLAVE_MASK; 951 952 /* 953 * Deal with possible race condition between interrupt 954 * handling and disabling interrupts on suspend. 955 * 956 * If the master is in the process of disabling 957 * interrupts, don't schedule a workqueue 958 */ 959 if (cdns->interrupt_enabled) 960 schedule_work(&cdns->work); 961 } 962 963 cdns_writel(cdns, CDNS_MCP_INTSTAT, int_status); 964 return IRQ_HANDLED; 965 } 966 EXPORT_SYMBOL(sdw_cdns_irq); 967 968 /** 969 * cdns_update_slave_status_work - update slave status in a work since we will need to handle 970 * other interrupts eg. CDNS_MCP_INT_RX_WL during the update slave 971 * process. 972 * @work: cdns worker thread 973 */ 974 static void cdns_update_slave_status_work(struct work_struct *work) 975 { 976 struct sdw_cdns *cdns = 977 container_of(work, struct sdw_cdns, work); 978 u32 slave0, slave1; 979 u64 slave_intstat; 980 u32 device0_status; 981 int retry_count = 0; 982 983 /* 984 * Clear main interrupt first so we don't lose any assertions 985 * that happen during this function. 986 */ 987 cdns_writel(cdns, CDNS_MCP_INTSTAT, CDNS_MCP_INT_SLAVE_MASK); 988 989 slave0 = cdns_readl(cdns, CDNS_MCP_SLAVE_INTSTAT0); 990 slave1 = cdns_readl(cdns, CDNS_MCP_SLAVE_INTSTAT1); 991 992 /* 993 * Clear the bits before handling so we don't lose any 994 * bits that re-assert. 995 */ 996 cdns_writel(cdns, CDNS_MCP_SLAVE_INTSTAT0, slave0); 997 cdns_writel(cdns, CDNS_MCP_SLAVE_INTSTAT1, slave1); 998 999 /* combine the two status */ 1000 slave_intstat = ((u64)slave1 << 32) | slave0; 1001 1002 dev_dbg_ratelimited(cdns->dev, "Slave status change: 0x%llx\n", slave_intstat); 1003 1004 update_status: 1005 cdns_update_slave_status(cdns, slave_intstat); 1006 1007 /* 1008 * When there is more than one peripheral per link, it's 1009 * possible that a deviceB becomes attached after we deal with 1010 * the attachment of deviceA. Since the hardware does a 1011 * logical AND, the attachment of the second device does not 1012 * change the status seen by the driver. 1013 * 1014 * In that case, clearing the registers above would result in 1015 * the deviceB never being detected - until a change of status 1016 * is observed on the bus. 1017 * 1018 * To avoid this race condition, re-check if any device0 needs 1019 * attention with PING commands. There is no need to check for 1020 * ALERTS since they are not allowed until a non-zero 1021 * device_number is assigned. 1022 * 1023 * Do not clear the INTSTAT0/1. While looping to enumerate devices on 1024 * #0 there could be status changes on other devices - these must 1025 * be kept in the INTSTAT so they can be handled when all #0 devices 1026 * have been handled. 1027 */ 1028 1029 device0_status = cdns_readl(cdns, CDNS_MCP_SLAVE_STAT); 1030 device0_status &= 3; 1031 1032 if (device0_status == SDW_SLAVE_ATTACHED) { 1033 if (retry_count++ < SDW_MAX_DEVICES) { 1034 dev_dbg_ratelimited(cdns->dev, 1035 "Device0 detected after clearing status, iteration %d\n", 1036 retry_count); 1037 slave_intstat = CDNS_MCP_SLAVE_INTSTAT_ATTACHED; 1038 goto update_status; 1039 } else { 1040 dev_err_ratelimited(cdns->dev, 1041 "Device0 detected after %d iterations\n", 1042 retry_count); 1043 } 1044 } 1045 1046 /* unmask Slave interrupt now */ 1047 cdns_updatel(cdns, CDNS_MCP_INTMASK, 1048 CDNS_MCP_INT_SLAVE_MASK, CDNS_MCP_INT_SLAVE_MASK); 1049 1050 } 1051 1052 /* paranoia check to make sure self-cleared bits are indeed cleared */ 1053 void sdw_cdns_check_self_clearing_bits(struct sdw_cdns *cdns, const char *string, 1054 bool initial_delay, int reset_iterations) 1055 { 1056 u32 ip_mcp_control; 1057 u32 mcp_control; 1058 u32 mcp_config_update; 1059 int i; 1060 1061 if (initial_delay) 1062 usleep_range(1000, 1500); 1063 1064 ip_mcp_control = cdns_ip_readl(cdns, CDNS_IP_MCP_CONTROL); 1065 1066 /* the following bits should be cleared immediately */ 1067 if (ip_mcp_control & CDNS_IP_MCP_CONTROL_SW_RST) 1068 dev_err(cdns->dev, "%s failed: IP_MCP_CONTROL_SW_RST is not cleared\n", string); 1069 1070 mcp_control = cdns_readl(cdns, CDNS_MCP_CONTROL); 1071 1072 /* the following bits should be cleared immediately */ 1073 if (mcp_control & CDNS_MCP_CONTROL_CMD_RST) 1074 dev_err(cdns->dev, "%s failed: MCP_CONTROL_CMD_RST is not cleared\n", string); 1075 if (mcp_control & CDNS_MCP_CONTROL_SOFT_RST) 1076 dev_err(cdns->dev, "%s failed: MCP_CONTROL_SOFT_RST is not cleared\n", string); 1077 if (mcp_control & CDNS_MCP_CONTROL_CLK_STOP_CLR) 1078 dev_err(cdns->dev, "%s failed: MCP_CONTROL_CLK_STOP_CLR is not cleared\n", string); 1079 1080 mcp_config_update = cdns_readl(cdns, CDNS_MCP_CONFIG_UPDATE); 1081 if (mcp_config_update & CDNS_MCP_CONFIG_UPDATE_BIT) 1082 dev_err(cdns->dev, "%s failed: MCP_CONFIG_UPDATE_BIT is not cleared\n", string); 1083 1084 i = 0; 1085 while (mcp_control & CDNS_MCP_CONTROL_HW_RST) { 1086 if (i == reset_iterations) { 1087 dev_err(cdns->dev, "%s failed: MCP_CONTROL_HW_RST is not cleared\n", string); 1088 break; 1089 } 1090 1091 dev_dbg(cdns->dev, "%s: MCP_CONTROL_HW_RST is not cleared at iteration %d\n", string, i); 1092 i++; 1093 1094 usleep_range(1000, 1500); 1095 mcp_control = cdns_readl(cdns, CDNS_MCP_CONTROL); 1096 } 1097 1098 } 1099 EXPORT_SYMBOL(sdw_cdns_check_self_clearing_bits); 1100 1101 /* 1102 * init routines 1103 */ 1104 1105 /** 1106 * sdw_cdns_exit_reset() - Program reset parameters and start bus operations 1107 * @cdns: Cadence instance 1108 */ 1109 int sdw_cdns_exit_reset(struct sdw_cdns *cdns) 1110 { 1111 /* keep reset delay unchanged to 4096 cycles */ 1112 1113 /* use hardware generated reset */ 1114 cdns_updatel(cdns, CDNS_MCP_CONTROL, 1115 CDNS_MCP_CONTROL_HW_RST, 1116 CDNS_MCP_CONTROL_HW_RST); 1117 1118 /* commit changes */ 1119 cdns_updatel(cdns, CDNS_MCP_CONFIG_UPDATE, 1120 CDNS_MCP_CONFIG_UPDATE_BIT, 1121 CDNS_MCP_CONFIG_UPDATE_BIT); 1122 1123 /* don't wait here */ 1124 return 0; 1125 1126 } 1127 EXPORT_SYMBOL(sdw_cdns_exit_reset); 1128 1129 /** 1130 * cdns_enable_slave_interrupts() - Enable SDW slave interrupts 1131 * @cdns: Cadence instance 1132 * @state: boolean for true/false 1133 */ 1134 static void cdns_enable_slave_interrupts(struct sdw_cdns *cdns, bool state) 1135 { 1136 u32 mask; 1137 1138 mask = cdns_readl(cdns, CDNS_MCP_INTMASK); 1139 if (state) 1140 mask |= CDNS_MCP_INT_SLAVE_MASK; 1141 else 1142 mask &= ~CDNS_MCP_INT_SLAVE_MASK; 1143 1144 cdns_writel(cdns, CDNS_MCP_INTMASK, mask); 1145 } 1146 1147 /** 1148 * sdw_cdns_enable_interrupt() - Enable SDW interrupts 1149 * @cdns: Cadence instance 1150 * @state: True if we are trying to enable interrupt. 1151 */ 1152 int sdw_cdns_enable_interrupt(struct sdw_cdns *cdns, bool state) 1153 { 1154 u32 slave_intmask0 = 0; 1155 u32 slave_intmask1 = 0; 1156 u32 mask = 0; 1157 1158 if (!state) 1159 goto update_masks; 1160 1161 slave_intmask0 = CDNS_MCP_SLAVE_INTMASK0_MASK; 1162 slave_intmask1 = CDNS_MCP_SLAVE_INTMASK1_MASK; 1163 1164 /* enable detection of all slave state changes */ 1165 mask = CDNS_MCP_INT_SLAVE_MASK; 1166 1167 /* enable detection of bus issues */ 1168 mask |= CDNS_MCP_INT_CTRL_CLASH | CDNS_MCP_INT_DATA_CLASH | 1169 CDNS_MCP_INT_PARITY; 1170 1171 /* port interrupt limited to test modes for now */ 1172 if (cdns->bus.params.m_data_mode != SDW_PORT_DATA_MODE_NORMAL) 1173 mask |= CDNS_MCP_INT_DPINT; 1174 1175 /* enable detection of RX fifo level */ 1176 mask |= CDNS_MCP_INT_RX_WL; 1177 1178 /* 1179 * CDNS_MCP_INT_IRQ needs to be set otherwise all previous 1180 * settings are irrelevant 1181 */ 1182 mask |= CDNS_MCP_INT_IRQ; 1183 1184 if (interrupt_mask) /* parameter override */ 1185 mask = interrupt_mask; 1186 1187 update_masks: 1188 /* clear slave interrupt status before enabling interrupt */ 1189 if (state) { 1190 u32 slave_state; 1191 1192 slave_state = cdns_readl(cdns, CDNS_MCP_SLAVE_INTSTAT0); 1193 cdns_writel(cdns, CDNS_MCP_SLAVE_INTSTAT0, slave_state); 1194 slave_state = cdns_readl(cdns, CDNS_MCP_SLAVE_INTSTAT1); 1195 cdns_writel(cdns, CDNS_MCP_SLAVE_INTSTAT1, slave_state); 1196 } 1197 cdns->interrupt_enabled = state; 1198 1199 /* 1200 * Complete any on-going status updates before updating masks, 1201 * and cancel queued status updates. 1202 * 1203 * There could be a race with a new interrupt thrown before 1204 * the 3 mask updates below are complete, so in the interrupt 1205 * we use the 'interrupt_enabled' status to prevent new work 1206 * from being queued. 1207 */ 1208 if (!state) 1209 cancel_work_sync(&cdns->work); 1210 1211 cdns_writel(cdns, CDNS_MCP_SLAVE_INTMASK0, slave_intmask0); 1212 cdns_writel(cdns, CDNS_MCP_SLAVE_INTMASK1, slave_intmask1); 1213 cdns_writel(cdns, CDNS_MCP_INTMASK, mask); 1214 1215 return 0; 1216 } 1217 EXPORT_SYMBOL(sdw_cdns_enable_interrupt); 1218 1219 static int cdns_allocate_pdi(struct sdw_cdns *cdns, 1220 struct sdw_cdns_pdi **stream, 1221 u32 num, u32 pdi_offset) 1222 { 1223 struct sdw_cdns_pdi *pdi; 1224 int i; 1225 1226 if (!num) 1227 return 0; 1228 1229 pdi = devm_kcalloc(cdns->dev, num, sizeof(*pdi), GFP_KERNEL); 1230 if (!pdi) 1231 return -ENOMEM; 1232 1233 for (i = 0; i < num; i++) { 1234 pdi[i].num = i + pdi_offset; 1235 } 1236 1237 *stream = pdi; 1238 return 0; 1239 } 1240 1241 /** 1242 * sdw_cdns_pdi_init() - PDI initialization routine 1243 * 1244 * @cdns: Cadence instance 1245 * @config: Stream configurations 1246 */ 1247 int sdw_cdns_pdi_init(struct sdw_cdns *cdns, 1248 struct sdw_cdns_stream_config config) 1249 { 1250 struct sdw_cdns_streams *stream; 1251 int offset; 1252 int ret; 1253 1254 cdns->pcm.num_bd = config.pcm_bd; 1255 cdns->pcm.num_in = config.pcm_in; 1256 cdns->pcm.num_out = config.pcm_out; 1257 1258 /* Allocate PDIs for PCMs */ 1259 stream = &cdns->pcm; 1260 1261 /* we allocate PDI0 and PDI1 which are used for Bulk */ 1262 offset = 0; 1263 1264 ret = cdns_allocate_pdi(cdns, &stream->bd, 1265 stream->num_bd, offset); 1266 if (ret) 1267 return ret; 1268 1269 offset += stream->num_bd; 1270 1271 ret = cdns_allocate_pdi(cdns, &stream->in, 1272 stream->num_in, offset); 1273 if (ret) 1274 return ret; 1275 1276 offset += stream->num_in; 1277 1278 ret = cdns_allocate_pdi(cdns, &stream->out, 1279 stream->num_out, offset); 1280 if (ret) 1281 return ret; 1282 1283 /* Update total number of PCM PDIs */ 1284 stream->num_pdi = stream->num_bd + stream->num_in + stream->num_out; 1285 cdns->num_ports = stream->num_pdi; 1286 1287 return 0; 1288 } 1289 EXPORT_SYMBOL(sdw_cdns_pdi_init); 1290 1291 static u32 cdns_set_initial_frame_shape(int n_rows, int n_cols) 1292 { 1293 u32 val; 1294 int c; 1295 int r; 1296 1297 r = sdw_find_row_index(n_rows); 1298 c = sdw_find_col_index(n_cols); 1299 1300 val = FIELD_PREP(CDNS_MCP_FRAME_SHAPE_ROW_MASK, r); 1301 val |= FIELD_PREP(CDNS_MCP_FRAME_SHAPE_COL_MASK, c); 1302 1303 return val; 1304 } 1305 1306 static void cdns_init_clock_ctrl(struct sdw_cdns *cdns) 1307 { 1308 struct sdw_bus *bus = &cdns->bus; 1309 struct sdw_master_prop *prop = &bus->prop; 1310 u32 val; 1311 u32 ssp_interval; 1312 int divider; 1313 1314 /* Set clock divider */ 1315 divider = (prop->mclk_freq / prop->max_clk_freq) - 1; 1316 1317 cdns_updatel(cdns, CDNS_MCP_CLK_CTRL0, 1318 CDNS_MCP_CLK_MCLKD_MASK, divider); 1319 cdns_updatel(cdns, CDNS_MCP_CLK_CTRL1, 1320 CDNS_MCP_CLK_MCLKD_MASK, divider); 1321 1322 /* 1323 * Frame shape changes after initialization have to be done 1324 * with the bank switch mechanism 1325 */ 1326 val = cdns_set_initial_frame_shape(prop->default_row, 1327 prop->default_col); 1328 cdns_writel(cdns, CDNS_MCP_FRAME_SHAPE_INIT, val); 1329 1330 /* Set SSP interval to default value */ 1331 ssp_interval = prop->default_frame_rate / SDW_CADENCE_GSYNC_HZ; 1332 cdns_writel(cdns, CDNS_MCP_SSP_CTRL0, ssp_interval); 1333 cdns_writel(cdns, CDNS_MCP_SSP_CTRL1, ssp_interval); 1334 } 1335 1336 /** 1337 * sdw_cdns_init() - Cadence initialization 1338 * @cdns: Cadence instance 1339 */ 1340 int sdw_cdns_init(struct sdw_cdns *cdns) 1341 { 1342 u32 val; 1343 1344 cdns_init_clock_ctrl(cdns); 1345 1346 sdw_cdns_check_self_clearing_bits(cdns, __func__, false, 0); 1347 1348 /* reset msg_count to default value of FIFOLEVEL */ 1349 cdns->msg_count = cdns_readl(cdns, CDNS_MCP_FIFOLEVEL); 1350 1351 /* flush command FIFOs */ 1352 cdns_updatel(cdns, CDNS_MCP_CONTROL, CDNS_MCP_CONTROL_CMD_RST, 1353 CDNS_MCP_CONTROL_CMD_RST); 1354 1355 /* Set cmd accept mode */ 1356 cdns_ip_updatel(cdns, CDNS_IP_MCP_CONTROL, CDNS_IP_MCP_CONTROL_CMD_ACCEPT, 1357 CDNS_IP_MCP_CONTROL_CMD_ACCEPT); 1358 1359 /* Configure mcp config */ 1360 val = cdns_readl(cdns, CDNS_MCP_CONFIG); 1361 1362 /* Disable auto bus release */ 1363 val &= ~CDNS_MCP_CONFIG_BUS_REL; 1364 1365 cdns_writel(cdns, CDNS_MCP_CONFIG, val); 1366 1367 /* Configure IP mcp config */ 1368 val = cdns_ip_readl(cdns, CDNS_IP_MCP_CONFIG); 1369 1370 /* enable bus operations with clock and data */ 1371 val &= ~CDNS_IP_MCP_CONFIG_OP; 1372 val |= CDNS_IP_MCP_CONFIG_OP_NORMAL; 1373 1374 /* Set cmd mode for Tx and Rx cmds */ 1375 val &= ~CDNS_IP_MCP_CONFIG_CMD; 1376 1377 /* Disable sniffer mode */ 1378 val &= ~CDNS_IP_MCP_CONFIG_SNIFFER; 1379 1380 if (cdns->bus.multi_link) 1381 /* Set Multi-master mode to take gsync into account */ 1382 val |= CDNS_IP_MCP_CONFIG_MMASTER; 1383 1384 /* leave frame delay to hardware default of 0x1F */ 1385 1386 /* leave command retry to hardware default of 0 */ 1387 1388 cdns_ip_writel(cdns, CDNS_IP_MCP_CONFIG, val); 1389 1390 /* changes will be committed later */ 1391 return 0; 1392 } 1393 EXPORT_SYMBOL(sdw_cdns_init); 1394 1395 int cdns_bus_conf(struct sdw_bus *bus, struct sdw_bus_params *params) 1396 { 1397 struct sdw_master_prop *prop = &bus->prop; 1398 struct sdw_cdns *cdns = bus_to_cdns(bus); 1399 int mcp_clkctrl_off; 1400 int divider; 1401 1402 if (!params->curr_dr_freq) { 1403 dev_err(cdns->dev, "NULL curr_dr_freq\n"); 1404 return -EINVAL; 1405 } 1406 1407 divider = prop->mclk_freq * SDW_DOUBLE_RATE_FACTOR / 1408 params->curr_dr_freq; 1409 divider--; /* divider is 1/(N+1) */ 1410 1411 if (params->next_bank) 1412 mcp_clkctrl_off = CDNS_MCP_CLK_CTRL1; 1413 else 1414 mcp_clkctrl_off = CDNS_MCP_CLK_CTRL0; 1415 1416 cdns_updatel(cdns, mcp_clkctrl_off, CDNS_MCP_CLK_MCLKD_MASK, divider); 1417 1418 return 0; 1419 } 1420 EXPORT_SYMBOL(cdns_bus_conf); 1421 1422 static int cdns_port_params(struct sdw_bus *bus, 1423 struct sdw_port_params *p_params, unsigned int bank) 1424 { 1425 struct sdw_cdns *cdns = bus_to_cdns(bus); 1426 int dpn_config_off_source; 1427 int dpn_config_off_target; 1428 int target_num = p_params->num; 1429 int source_num = p_params->num; 1430 bool override = false; 1431 int dpn_config; 1432 1433 if (target_num == cdns->pdi_loopback_target && 1434 cdns->pdi_loopback_source != -1) { 1435 source_num = cdns->pdi_loopback_source; 1436 override = true; 1437 } 1438 1439 if (bank) { 1440 dpn_config_off_source = CDNS_DPN_B1_CONFIG(source_num); 1441 dpn_config_off_target = CDNS_DPN_B1_CONFIG(target_num); 1442 } else { 1443 dpn_config_off_source = CDNS_DPN_B0_CONFIG(source_num); 1444 dpn_config_off_target = CDNS_DPN_B0_CONFIG(target_num); 1445 } 1446 1447 dpn_config = cdns_readl(cdns, dpn_config_off_source); 1448 1449 /* use port params if there is no loopback, otherwise use source as is */ 1450 if (!override) { 1451 u32p_replace_bits(&dpn_config, p_params->bps - 1, CDNS_DPN_CONFIG_WL); 1452 u32p_replace_bits(&dpn_config, p_params->flow_mode, CDNS_DPN_CONFIG_PORT_FLOW); 1453 u32p_replace_bits(&dpn_config, p_params->data_mode, CDNS_DPN_CONFIG_PORT_DAT); 1454 } 1455 1456 cdns_writel(cdns, dpn_config_off_target, dpn_config); 1457 1458 return 0; 1459 } 1460 1461 static int cdns_transport_params(struct sdw_bus *bus, 1462 struct sdw_transport_params *t_params, 1463 enum sdw_reg_bank bank) 1464 { 1465 struct sdw_cdns *cdns = bus_to_cdns(bus); 1466 int dpn_config; 1467 int dpn_config_off_source; 1468 int dpn_config_off_target; 1469 int dpn_hctrl; 1470 int dpn_hctrl_off_source; 1471 int dpn_hctrl_off_target; 1472 int dpn_offsetctrl; 1473 int dpn_offsetctrl_off_source; 1474 int dpn_offsetctrl_off_target; 1475 int dpn_samplectrl; 1476 int dpn_samplectrl_off_source; 1477 int dpn_samplectrl_off_target; 1478 int source_num = t_params->port_num; 1479 int target_num = t_params->port_num; 1480 bool override = false; 1481 1482 if (target_num == cdns->pdi_loopback_target && 1483 cdns->pdi_loopback_source != -1) { 1484 source_num = cdns->pdi_loopback_source; 1485 override = true; 1486 } 1487 1488 /* 1489 * Note: Only full data port is supported on the Master side for 1490 * both PCM and PDM ports. 1491 */ 1492 1493 if (bank) { 1494 dpn_config_off_source = CDNS_DPN_B1_CONFIG(source_num); 1495 dpn_hctrl_off_source = CDNS_DPN_B1_HCTRL(source_num); 1496 dpn_offsetctrl_off_source = CDNS_DPN_B1_OFFSET_CTRL(source_num); 1497 dpn_samplectrl_off_source = CDNS_DPN_B1_SAMPLE_CTRL(source_num); 1498 1499 dpn_config_off_target = CDNS_DPN_B1_CONFIG(target_num); 1500 dpn_hctrl_off_target = CDNS_DPN_B1_HCTRL(target_num); 1501 dpn_offsetctrl_off_target = CDNS_DPN_B1_OFFSET_CTRL(target_num); 1502 dpn_samplectrl_off_target = CDNS_DPN_B1_SAMPLE_CTRL(target_num); 1503 1504 } else { 1505 dpn_config_off_source = CDNS_DPN_B0_CONFIG(source_num); 1506 dpn_hctrl_off_source = CDNS_DPN_B0_HCTRL(source_num); 1507 dpn_offsetctrl_off_source = CDNS_DPN_B0_OFFSET_CTRL(source_num); 1508 dpn_samplectrl_off_source = CDNS_DPN_B0_SAMPLE_CTRL(source_num); 1509 1510 dpn_config_off_target = CDNS_DPN_B0_CONFIG(target_num); 1511 dpn_hctrl_off_target = CDNS_DPN_B0_HCTRL(target_num); 1512 dpn_offsetctrl_off_target = CDNS_DPN_B0_OFFSET_CTRL(target_num); 1513 dpn_samplectrl_off_target = CDNS_DPN_B0_SAMPLE_CTRL(target_num); 1514 } 1515 1516 dpn_config = cdns_readl(cdns, dpn_config_off_source); 1517 if (!override) { 1518 u32p_replace_bits(&dpn_config, t_params->blk_grp_ctrl, CDNS_DPN_CONFIG_BGC); 1519 u32p_replace_bits(&dpn_config, t_params->blk_pkg_mode, CDNS_DPN_CONFIG_BPM); 1520 } 1521 cdns_writel(cdns, dpn_config_off_target, dpn_config); 1522 1523 if (!override) { 1524 dpn_offsetctrl = 0; 1525 u32p_replace_bits(&dpn_offsetctrl, t_params->offset1, CDNS_DPN_OFFSET_CTRL_1); 1526 u32p_replace_bits(&dpn_offsetctrl, t_params->offset2, CDNS_DPN_OFFSET_CTRL_2); 1527 } else { 1528 dpn_offsetctrl = cdns_readl(cdns, dpn_offsetctrl_off_source); 1529 } 1530 cdns_writel(cdns, dpn_offsetctrl_off_target, dpn_offsetctrl); 1531 1532 if (!override) { 1533 dpn_hctrl = 0; 1534 u32p_replace_bits(&dpn_hctrl, t_params->hstart, CDNS_DPN_HCTRL_HSTART); 1535 u32p_replace_bits(&dpn_hctrl, t_params->hstop, CDNS_DPN_HCTRL_HSTOP); 1536 u32p_replace_bits(&dpn_hctrl, t_params->lane_ctrl, CDNS_DPN_HCTRL_LCTRL); 1537 } else { 1538 dpn_hctrl = cdns_readl(cdns, dpn_hctrl_off_source); 1539 } 1540 cdns_writel(cdns, dpn_hctrl_off_target, dpn_hctrl); 1541 1542 if (!override) 1543 dpn_samplectrl = t_params->sample_interval - 1; 1544 else 1545 dpn_samplectrl = cdns_readl(cdns, dpn_samplectrl_off_source); 1546 cdns_writel(cdns, dpn_samplectrl_off_target, dpn_samplectrl); 1547 1548 return 0; 1549 } 1550 1551 static int cdns_port_enable(struct sdw_bus *bus, 1552 struct sdw_enable_ch *enable_ch, unsigned int bank) 1553 { 1554 struct sdw_cdns *cdns = bus_to_cdns(bus); 1555 int dpn_chnen_off, ch_mask; 1556 1557 if (bank) 1558 dpn_chnen_off = CDNS_DPN_B1_CH_EN(enable_ch->port_num); 1559 else 1560 dpn_chnen_off = CDNS_DPN_B0_CH_EN(enable_ch->port_num); 1561 1562 ch_mask = enable_ch->ch_mask * enable_ch->enable; 1563 cdns_writel(cdns, dpn_chnen_off, ch_mask); 1564 1565 return 0; 1566 } 1567 1568 static const struct sdw_master_port_ops cdns_port_ops = { 1569 .dpn_set_port_params = cdns_port_params, 1570 .dpn_set_port_transport_params = cdns_transport_params, 1571 .dpn_port_enable_ch = cdns_port_enable, 1572 }; 1573 1574 /** 1575 * sdw_cdns_is_clock_stop: Check clock status 1576 * 1577 * @cdns: Cadence instance 1578 */ 1579 bool sdw_cdns_is_clock_stop(struct sdw_cdns *cdns) 1580 { 1581 return !!(cdns_readl(cdns, CDNS_MCP_STAT) & CDNS_MCP_STAT_CLK_STOP); 1582 } 1583 EXPORT_SYMBOL(sdw_cdns_is_clock_stop); 1584 1585 /** 1586 * sdw_cdns_clock_stop: Cadence clock stop configuration routine 1587 * 1588 * @cdns: Cadence instance 1589 * @block_wake: prevent wakes if required by the platform 1590 */ 1591 int sdw_cdns_clock_stop(struct sdw_cdns *cdns, bool block_wake) 1592 { 1593 bool slave_present = false; 1594 struct sdw_slave *slave; 1595 int ret; 1596 1597 sdw_cdns_check_self_clearing_bits(cdns, __func__, false, 0); 1598 1599 /* Check suspend status */ 1600 if (sdw_cdns_is_clock_stop(cdns)) { 1601 dev_dbg(cdns->dev, "Clock is already stopped\n"); 1602 return 0; 1603 } 1604 1605 /* 1606 * Before entering clock stop we mask the Slave 1607 * interrupts. This helps avoid having to deal with e.g. a 1608 * Slave becoming UNATTACHED while the clock is being stopped 1609 */ 1610 cdns_enable_slave_interrupts(cdns, false); 1611 1612 /* 1613 * For specific platforms, it is required to be able to put 1614 * master into a state in which it ignores wake-up trials 1615 * in clock stop state 1616 */ 1617 if (block_wake) 1618 cdns_ip_updatel(cdns, CDNS_IP_MCP_CONTROL, 1619 CDNS_IP_MCP_CONTROL_BLOCK_WAKEUP, 1620 CDNS_IP_MCP_CONTROL_BLOCK_WAKEUP); 1621 1622 list_for_each_entry(slave, &cdns->bus.slaves, node) { 1623 if (slave->status == SDW_SLAVE_ATTACHED || 1624 slave->status == SDW_SLAVE_ALERT) { 1625 slave_present = true; 1626 break; 1627 } 1628 } 1629 1630 /* commit changes */ 1631 ret = cdns_config_update(cdns); 1632 if (ret < 0) { 1633 dev_err(cdns->dev, "%s: config_update failed\n", __func__); 1634 return ret; 1635 } 1636 1637 /* Prepare slaves for clock stop */ 1638 if (slave_present) { 1639 ret = sdw_bus_prep_clk_stop(&cdns->bus); 1640 if (ret < 0 && ret != -ENODATA) { 1641 dev_err(cdns->dev, "prepare clock stop failed %d\n", ret); 1642 return ret; 1643 } 1644 } 1645 1646 /* 1647 * Enter clock stop mode and only report errors if there are 1648 * Slave devices present (ALERT or ATTACHED) 1649 */ 1650 ret = sdw_bus_clk_stop(&cdns->bus); 1651 if (ret < 0 && slave_present && ret != -ENODATA) { 1652 dev_err(cdns->dev, "bus clock stop failed %d\n", ret); 1653 return ret; 1654 } 1655 1656 ret = cdns_set_wait(cdns, CDNS_MCP_STAT, 1657 CDNS_MCP_STAT_CLK_STOP, 1658 CDNS_MCP_STAT_CLK_STOP); 1659 if (ret < 0) 1660 dev_err(cdns->dev, "Clock stop failed %d\n", ret); 1661 1662 return ret; 1663 } 1664 EXPORT_SYMBOL(sdw_cdns_clock_stop); 1665 1666 /** 1667 * sdw_cdns_clock_restart: Cadence PM clock restart configuration routine 1668 * 1669 * @cdns: Cadence instance 1670 * @bus_reset: context may be lost while in low power modes and the bus 1671 * may require a Severe Reset and re-enumeration after a wake. 1672 */ 1673 int sdw_cdns_clock_restart(struct sdw_cdns *cdns, bool bus_reset) 1674 { 1675 int ret; 1676 1677 /* unmask Slave interrupts that were masked when stopping the clock */ 1678 cdns_enable_slave_interrupts(cdns, true); 1679 1680 ret = cdns_clear_bit(cdns, CDNS_MCP_CONTROL, 1681 CDNS_MCP_CONTROL_CLK_STOP_CLR); 1682 if (ret < 0) { 1683 dev_err(cdns->dev, "Couldn't exit from clock stop\n"); 1684 return ret; 1685 } 1686 1687 ret = cdns_set_wait(cdns, CDNS_MCP_STAT, CDNS_MCP_STAT_CLK_STOP, 0); 1688 if (ret < 0) { 1689 dev_err(cdns->dev, "clock stop exit failed %d\n", ret); 1690 return ret; 1691 } 1692 1693 cdns_ip_updatel(cdns, CDNS_IP_MCP_CONTROL, 1694 CDNS_IP_MCP_CONTROL_BLOCK_WAKEUP, 0); 1695 1696 cdns_ip_updatel(cdns, CDNS_IP_MCP_CONTROL, CDNS_IP_MCP_CONTROL_CMD_ACCEPT, 1697 CDNS_IP_MCP_CONTROL_CMD_ACCEPT); 1698 1699 if (!bus_reset) { 1700 1701 /* enable bus operations with clock and data */ 1702 cdns_ip_updatel(cdns, CDNS_IP_MCP_CONFIG, 1703 CDNS_IP_MCP_CONFIG_OP, 1704 CDNS_IP_MCP_CONFIG_OP_NORMAL); 1705 1706 ret = cdns_config_update(cdns); 1707 if (ret < 0) { 1708 dev_err(cdns->dev, "%s: config_update failed\n", __func__); 1709 return ret; 1710 } 1711 1712 ret = sdw_bus_exit_clk_stop(&cdns->bus); 1713 if (ret < 0) 1714 dev_err(cdns->dev, "bus failed to exit clock stop %d\n", ret); 1715 } 1716 1717 return ret; 1718 } 1719 EXPORT_SYMBOL(sdw_cdns_clock_restart); 1720 1721 /** 1722 * sdw_cdns_probe() - Cadence probe routine 1723 * @cdns: Cadence instance 1724 */ 1725 int sdw_cdns_probe(struct sdw_cdns *cdns) 1726 { 1727 init_completion(&cdns->tx_complete); 1728 cdns->bus.port_ops = &cdns_port_ops; 1729 1730 INIT_WORK(&cdns->work, cdns_update_slave_status_work); 1731 return 0; 1732 } 1733 EXPORT_SYMBOL(sdw_cdns_probe); 1734 1735 int cdns_set_sdw_stream(struct snd_soc_dai *dai, 1736 void *stream, int direction) 1737 { 1738 struct sdw_cdns *cdns = snd_soc_dai_get_drvdata(dai); 1739 struct sdw_cdns_dai_runtime *dai_runtime; 1740 1741 dai_runtime = cdns->dai_runtime_array[dai->id]; 1742 1743 if (stream) { 1744 /* first paranoia check */ 1745 if (dai_runtime) { 1746 dev_err(dai->dev, 1747 "dai_runtime already allocated for dai %s\n", 1748 dai->name); 1749 return -EINVAL; 1750 } 1751 1752 /* allocate and set dai_runtime info */ 1753 dai_runtime = kzalloc(sizeof(*dai_runtime), GFP_KERNEL); 1754 if (!dai_runtime) 1755 return -ENOMEM; 1756 1757 dai_runtime->stream_type = SDW_STREAM_PCM; 1758 1759 dai_runtime->bus = &cdns->bus; 1760 dai_runtime->link_id = cdns->instance; 1761 1762 dai_runtime->stream = stream; 1763 dai_runtime->direction = direction; 1764 1765 cdns->dai_runtime_array[dai->id] = dai_runtime; 1766 } else { 1767 /* second paranoia check */ 1768 if (!dai_runtime) { 1769 dev_err(dai->dev, 1770 "dai_runtime not allocated for dai %s\n", 1771 dai->name); 1772 return -EINVAL; 1773 } 1774 1775 /* for NULL stream we release allocated dai_runtime */ 1776 kfree(dai_runtime); 1777 cdns->dai_runtime_array[dai->id] = NULL; 1778 } 1779 return 0; 1780 } 1781 EXPORT_SYMBOL(cdns_set_sdw_stream); 1782 1783 /** 1784 * cdns_find_pdi() - Find a free PDI 1785 * 1786 * @cdns: Cadence instance 1787 * @offset: Starting offset 1788 * @num: Number of PDIs 1789 * @pdi: PDI instances 1790 * @dai_id: DAI id 1791 * 1792 * Find a PDI for a given PDI array. The PDI num and dai_id are 1793 * expected to match, return NULL otherwise. 1794 */ 1795 static struct sdw_cdns_pdi *cdns_find_pdi(struct sdw_cdns *cdns, 1796 unsigned int offset, 1797 unsigned int num, 1798 struct sdw_cdns_pdi *pdi, 1799 int dai_id) 1800 { 1801 int i; 1802 1803 for (i = offset; i < offset + num; i++) 1804 if (pdi[i].num == dai_id) 1805 return &pdi[i]; 1806 1807 return NULL; 1808 } 1809 1810 /** 1811 * sdw_cdns_config_stream: Configure a stream 1812 * 1813 * @cdns: Cadence instance 1814 * @ch: Channel count 1815 * @dir: Data direction 1816 * @pdi: PDI to be used 1817 */ 1818 void sdw_cdns_config_stream(struct sdw_cdns *cdns, 1819 u32 ch, u32 dir, struct sdw_cdns_pdi *pdi) 1820 { 1821 u32 offset, val = 0; 1822 1823 if (dir == SDW_DATA_DIR_RX) { 1824 val = CDNS_PORTCTRL_DIRN; 1825 1826 if (cdns->bus.params.m_data_mode != SDW_PORT_DATA_MODE_NORMAL) 1827 val |= CDNS_PORTCTRL_TEST_FAILED; 1828 } 1829 offset = CDNS_PORTCTRL + pdi->num * CDNS_PORT_OFFSET; 1830 cdns_updatel(cdns, offset, 1831 CDNS_PORTCTRL_DIRN | CDNS_PORTCTRL_TEST_FAILED, 1832 val); 1833 1834 val = pdi->num; 1835 val |= CDNS_PDI_CONFIG_SOFT_RESET; 1836 val |= FIELD_PREP(CDNS_PDI_CONFIG_CHANNEL, (1 << ch) - 1); 1837 cdns_writel(cdns, CDNS_PDI_CONFIG(pdi->num), val); 1838 } 1839 EXPORT_SYMBOL(sdw_cdns_config_stream); 1840 1841 /** 1842 * sdw_cdns_alloc_pdi() - Allocate a PDI 1843 * 1844 * @cdns: Cadence instance 1845 * @stream: Stream to be allocated 1846 * @ch: Channel count 1847 * @dir: Data direction 1848 * @dai_id: DAI id 1849 */ 1850 struct sdw_cdns_pdi *sdw_cdns_alloc_pdi(struct sdw_cdns *cdns, 1851 struct sdw_cdns_streams *stream, 1852 u32 ch, u32 dir, int dai_id) 1853 { 1854 struct sdw_cdns_pdi *pdi = NULL; 1855 1856 if (dir == SDW_DATA_DIR_RX) 1857 pdi = cdns_find_pdi(cdns, 0, stream->num_in, stream->in, 1858 dai_id); 1859 else 1860 pdi = cdns_find_pdi(cdns, 0, stream->num_out, stream->out, 1861 dai_id); 1862 1863 /* check if we found a PDI, else find in bi-directional */ 1864 if (!pdi) 1865 pdi = cdns_find_pdi(cdns, 2, stream->num_bd, stream->bd, 1866 dai_id); 1867 1868 if (pdi) { 1869 pdi->l_ch_num = 0; 1870 pdi->h_ch_num = ch - 1; 1871 pdi->dir = dir; 1872 pdi->ch_count = ch; 1873 } 1874 1875 return pdi; 1876 } 1877 EXPORT_SYMBOL(sdw_cdns_alloc_pdi); 1878 1879 MODULE_LICENSE("Dual BSD/GPL"); 1880 MODULE_DESCRIPTION("Cadence Soundwire Library"); 1881