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 if (msg->flags == SDW_MSG_FLAG_READ) { 548 /* fill response */ 549 for (i = 0; i < count; i++) 550 msg->buf[i + offset] = FIELD_GET(CDNS_MCP_RESP_RDATA, 551 cdns->response_buf[i]); 552 } 553 554 return SDW_CMD_OK; 555 } 556 557 static enum sdw_command_response 558 _cdns_xfer_msg(struct sdw_cdns *cdns, struct sdw_msg *msg, int cmd, 559 int offset, int count, bool defer) 560 { 561 unsigned long time; 562 u32 base, i, data; 563 u16 addr; 564 565 /* Program the watermark level for RX FIFO */ 566 if (cdns->msg_count != count) { 567 cdns_writel(cdns, CDNS_MCP_FIFOLEVEL, count); 568 cdns->msg_count = count; 569 } 570 571 base = CDNS_MCP_CMD_BASE; 572 addr = msg->addr + offset; 573 574 for (i = 0; i < count; i++) { 575 data = FIELD_PREP(CDNS_MCP_CMD_DEV_ADDR, msg->dev_num); 576 data |= FIELD_PREP(CDNS_MCP_CMD_COMMAND, cmd); 577 data |= FIELD_PREP(CDNS_MCP_CMD_REG_ADDR, addr); 578 addr++; 579 580 if (msg->flags == SDW_MSG_FLAG_WRITE) 581 data |= msg->buf[i + offset]; 582 583 data |= FIELD_PREP(CDNS_MCP_CMD_SSP_TAG, msg->ssp_sync); 584 cdns_writel(cdns, base, data); 585 base += CDNS_MCP_CMD_WORD_LEN; 586 } 587 588 if (defer) 589 return SDW_CMD_OK; 590 591 /* wait for timeout or response */ 592 time = wait_for_completion_timeout(&cdns->tx_complete, 593 msecs_to_jiffies(CDNS_TX_TIMEOUT)); 594 if (!time) { 595 dev_err(cdns->dev, "IO transfer timed out, cmd %d device %d addr %x len %d\n", 596 cmd, msg->dev_num, msg->addr, msg->len); 597 msg->len = 0; 598 return SDW_CMD_TIMEOUT; 599 } 600 601 return cdns_fill_msg_resp(cdns, msg, count, offset); 602 } 603 604 static enum sdw_command_response 605 cdns_program_scp_addr(struct sdw_cdns *cdns, struct sdw_msg *msg) 606 { 607 int nack = 0, no_ack = 0; 608 unsigned long time; 609 u32 data[2], base; 610 int i; 611 612 /* Program the watermark level for RX FIFO */ 613 if (cdns->msg_count != CDNS_SCP_RX_FIFOLEVEL) { 614 cdns_writel(cdns, CDNS_MCP_FIFOLEVEL, CDNS_SCP_RX_FIFOLEVEL); 615 cdns->msg_count = CDNS_SCP_RX_FIFOLEVEL; 616 } 617 618 data[0] = FIELD_PREP(CDNS_MCP_CMD_DEV_ADDR, msg->dev_num); 619 data[0] |= FIELD_PREP(CDNS_MCP_CMD_COMMAND, 0x3); 620 data[1] = data[0]; 621 622 data[0] |= FIELD_PREP(CDNS_MCP_CMD_REG_ADDR, SDW_SCP_ADDRPAGE1); 623 data[1] |= FIELD_PREP(CDNS_MCP_CMD_REG_ADDR, SDW_SCP_ADDRPAGE2); 624 625 data[0] |= msg->addr_page1; 626 data[1] |= msg->addr_page2; 627 628 base = CDNS_MCP_CMD_BASE; 629 cdns_writel(cdns, base, data[0]); 630 base += CDNS_MCP_CMD_WORD_LEN; 631 cdns_writel(cdns, base, data[1]); 632 633 time = wait_for_completion_timeout(&cdns->tx_complete, 634 msecs_to_jiffies(CDNS_TX_TIMEOUT)); 635 if (!time) { 636 dev_err(cdns->dev, "SCP Msg trf timed out\n"); 637 msg->len = 0; 638 return SDW_CMD_TIMEOUT; 639 } 640 641 /* check response the writes */ 642 for (i = 0; i < 2; i++) { 643 if (!(cdns->response_buf[i] & CDNS_MCP_RESP_ACK)) { 644 no_ack = 1; 645 dev_err(cdns->dev, "Program SCP Ack not received\n"); 646 if (cdns->response_buf[i] & CDNS_MCP_RESP_NACK) { 647 nack = 1; 648 dev_err(cdns->dev, "Program SCP NACK received\n"); 649 } 650 } 651 } 652 653 /* For NACK, NO ack, don't return err if we are in Broadcast mode */ 654 if (nack) { 655 dev_err_ratelimited(cdns->dev, 656 "SCP_addrpage NACKed for Slave %d\n", msg->dev_num); 657 return SDW_CMD_FAIL; 658 } 659 660 if (no_ack) { 661 dev_dbg_ratelimited(cdns->dev, 662 "SCP_addrpage ignored for Slave %d\n", msg->dev_num); 663 return SDW_CMD_IGNORED; 664 } 665 666 return SDW_CMD_OK; 667 } 668 669 static int cdns_prep_msg(struct sdw_cdns *cdns, struct sdw_msg *msg, int *cmd) 670 { 671 int ret; 672 673 if (msg->page) { 674 ret = cdns_program_scp_addr(cdns, msg); 675 if (ret) { 676 msg->len = 0; 677 return ret; 678 } 679 } 680 681 switch (msg->flags) { 682 case SDW_MSG_FLAG_READ: 683 *cmd = CDNS_MCP_CMD_READ; 684 break; 685 686 case SDW_MSG_FLAG_WRITE: 687 *cmd = CDNS_MCP_CMD_WRITE; 688 break; 689 690 default: 691 dev_err(cdns->dev, "Invalid msg cmd: %d\n", msg->flags); 692 return -EINVAL; 693 } 694 695 return 0; 696 } 697 698 enum sdw_command_response 699 cdns_xfer_msg(struct sdw_bus *bus, struct sdw_msg *msg) 700 { 701 struct sdw_cdns *cdns = bus_to_cdns(bus); 702 int cmd = 0, ret, i; 703 704 ret = cdns_prep_msg(cdns, msg, &cmd); 705 if (ret) 706 return SDW_CMD_FAIL_OTHER; 707 708 for (i = 0; i < msg->len / CDNS_MCP_CMD_LEN; i++) { 709 ret = _cdns_xfer_msg(cdns, msg, cmd, i * CDNS_MCP_CMD_LEN, 710 CDNS_MCP_CMD_LEN, false); 711 if (ret != SDW_CMD_OK) 712 return ret; 713 } 714 715 if (!(msg->len % CDNS_MCP_CMD_LEN)) 716 return SDW_CMD_OK; 717 718 return _cdns_xfer_msg(cdns, msg, cmd, i * CDNS_MCP_CMD_LEN, 719 msg->len % CDNS_MCP_CMD_LEN, false); 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 u32 val; 794 int i, set_status; 795 796 memset(status, 0, sizeof(status)); 797 798 for (i = 0; i <= SDW_MAX_DEVICES; i++) { 799 mask = (slave_intstat >> (i * CDNS_MCP_SLAVE_STATUS_NUM)) & 800 CDNS_MCP_SLAVE_STATUS_BITS; 801 802 set_status = 0; 803 804 if (mask) { 805 is_slave = true; 806 807 if (mask & CDNS_MCP_SLAVE_INTSTAT_RESERVED) { 808 status[i] = SDW_SLAVE_RESERVED; 809 set_status++; 810 } 811 812 if (mask & CDNS_MCP_SLAVE_INTSTAT_ATTACHED) { 813 status[i] = SDW_SLAVE_ATTACHED; 814 set_status++; 815 } 816 817 if (mask & CDNS_MCP_SLAVE_INTSTAT_ALERT) { 818 status[i] = SDW_SLAVE_ALERT; 819 set_status++; 820 } 821 822 if (mask & CDNS_MCP_SLAVE_INTSTAT_NPRESENT) { 823 status[i] = SDW_SLAVE_UNATTACHED; 824 set_status++; 825 } 826 } 827 828 /* 829 * check that there was a single reported Slave status and when 830 * there is not use the latest status extracted from PING commands 831 */ 832 if (set_status != 1) { 833 val = cdns_readl(cdns, CDNS_MCP_SLAVE_STAT); 834 val >>= (i * 2); 835 836 switch (val & 0x3) { 837 case 0: 838 status[i] = SDW_SLAVE_UNATTACHED; 839 break; 840 case 1: 841 status[i] = SDW_SLAVE_ATTACHED; 842 break; 843 case 2: 844 status[i] = SDW_SLAVE_ALERT; 845 break; 846 case 3: 847 default: 848 status[i] = SDW_SLAVE_RESERVED; 849 break; 850 } 851 } 852 } 853 854 if (is_slave) 855 return sdw_handle_slave_status(&cdns->bus, status); 856 857 return 0; 858 } 859 860 /** 861 * sdw_cdns_irq() - Cadence interrupt handler 862 * @irq: irq number 863 * @dev_id: irq context 864 */ 865 irqreturn_t sdw_cdns_irq(int irq, void *dev_id) 866 { 867 struct sdw_cdns *cdns = dev_id; 868 u32 int_status; 869 870 /* Check if the link is up */ 871 if (!cdns->link_up) 872 return IRQ_NONE; 873 874 int_status = cdns_readl(cdns, CDNS_MCP_INTSTAT); 875 876 /* check for reserved values read as zero */ 877 if (int_status & CDNS_MCP_INT_RESERVED) 878 return IRQ_NONE; 879 880 if (!(int_status & CDNS_MCP_INT_IRQ)) 881 return IRQ_NONE; 882 883 if (int_status & CDNS_MCP_INT_RX_WL) { 884 cdns_read_response(cdns); 885 886 if (cdns->defer) { 887 cdns_fill_msg_resp(cdns, cdns->defer->msg, 888 cdns->defer->length, 0); 889 complete(&cdns->defer->complete); 890 cdns->defer = NULL; 891 } else { 892 complete(&cdns->tx_complete); 893 } 894 } 895 896 if (int_status & CDNS_MCP_INT_PARITY) { 897 /* Parity error detected by Master */ 898 dev_err_ratelimited(cdns->dev, "Parity error\n"); 899 } 900 901 if (int_status & CDNS_MCP_INT_CTRL_CLASH) { 902 /* Slave is driving bit slot during control word */ 903 dev_err_ratelimited(cdns->dev, "Bus clash for control word\n"); 904 } 905 906 if (int_status & CDNS_MCP_INT_DATA_CLASH) { 907 /* 908 * Multiple slaves trying to drive bit slot, or issue with 909 * ownership of data bits or Slave gone bonkers 910 */ 911 dev_err_ratelimited(cdns->dev, "Bus clash for data word\n"); 912 } 913 914 if (cdns->bus.params.m_data_mode != SDW_PORT_DATA_MODE_NORMAL && 915 int_status & CDNS_MCP_INT_DPINT) { 916 u32 port_intstat; 917 918 /* just log which ports report an error */ 919 port_intstat = cdns_readl(cdns, CDNS_MCP_PORT_INTSTAT); 920 dev_err_ratelimited(cdns->dev, "DP interrupt: PortIntStat %8x\n", 921 port_intstat); 922 923 /* clear status w/ write1 */ 924 cdns_writel(cdns, CDNS_MCP_PORT_INTSTAT, port_intstat); 925 } 926 927 if (int_status & CDNS_MCP_INT_SLAVE_MASK) { 928 /* Mask the Slave interrupt and wake thread */ 929 cdns_updatel(cdns, CDNS_MCP_INTMASK, 930 CDNS_MCP_INT_SLAVE_MASK, 0); 931 932 int_status &= ~CDNS_MCP_INT_SLAVE_MASK; 933 934 /* 935 * Deal with possible race condition between interrupt 936 * handling and disabling interrupts on suspend. 937 * 938 * If the master is in the process of disabling 939 * interrupts, don't schedule a workqueue 940 */ 941 if (cdns->interrupt_enabled) 942 schedule_work(&cdns->work); 943 } 944 945 cdns_writel(cdns, CDNS_MCP_INTSTAT, int_status); 946 return IRQ_HANDLED; 947 } 948 EXPORT_SYMBOL(sdw_cdns_irq); 949 950 /** 951 * cdns_update_slave_status_work - update slave status in a work since we will need to handle 952 * other interrupts eg. CDNS_MCP_INT_RX_WL during the update slave 953 * process. 954 * @work: cdns worker thread 955 */ 956 static void cdns_update_slave_status_work(struct work_struct *work) 957 { 958 struct sdw_cdns *cdns = 959 container_of(work, struct sdw_cdns, work); 960 u32 slave0, slave1; 961 u64 slave_intstat; 962 u32 device0_status; 963 int retry_count = 0; 964 965 /* 966 * Clear main interrupt first so we don't lose any assertions 967 * that happen during this function. 968 */ 969 cdns_writel(cdns, CDNS_MCP_INTSTAT, CDNS_MCP_INT_SLAVE_MASK); 970 971 slave0 = cdns_readl(cdns, CDNS_MCP_SLAVE_INTSTAT0); 972 slave1 = cdns_readl(cdns, CDNS_MCP_SLAVE_INTSTAT1); 973 974 /* 975 * Clear the bits before handling so we don't lose any 976 * bits that re-assert. 977 */ 978 cdns_writel(cdns, CDNS_MCP_SLAVE_INTSTAT0, slave0); 979 cdns_writel(cdns, CDNS_MCP_SLAVE_INTSTAT1, slave1); 980 981 /* combine the two status */ 982 slave_intstat = ((u64)slave1 << 32) | slave0; 983 984 dev_dbg_ratelimited(cdns->dev, "Slave status change: 0x%llx\n", slave_intstat); 985 986 update_status: 987 cdns_update_slave_status(cdns, slave_intstat); 988 989 /* 990 * When there is more than one peripheral per link, it's 991 * possible that a deviceB becomes attached after we deal with 992 * the attachment of deviceA. Since the hardware does a 993 * logical AND, the attachment of the second device does not 994 * change the status seen by the driver. 995 * 996 * In that case, clearing the registers above would result in 997 * the deviceB never being detected - until a change of status 998 * is observed on the bus. 999 * 1000 * To avoid this race condition, re-check if any device0 needs 1001 * attention with PING commands. There is no need to check for 1002 * ALERTS since they are not allowed until a non-zero 1003 * device_number is assigned. 1004 * 1005 * Do not clear the INTSTAT0/1. While looping to enumerate devices on 1006 * #0 there could be status changes on other devices - these must 1007 * be kept in the INTSTAT so they can be handled when all #0 devices 1008 * have been handled. 1009 */ 1010 1011 device0_status = cdns_readl(cdns, CDNS_MCP_SLAVE_STAT); 1012 device0_status &= 3; 1013 1014 if (device0_status == SDW_SLAVE_ATTACHED) { 1015 if (retry_count++ < SDW_MAX_DEVICES) { 1016 dev_dbg_ratelimited(cdns->dev, 1017 "Device0 detected after clearing status, iteration %d\n", 1018 retry_count); 1019 slave_intstat = CDNS_MCP_SLAVE_INTSTAT_ATTACHED; 1020 goto update_status; 1021 } else { 1022 dev_err_ratelimited(cdns->dev, 1023 "Device0 detected after %d iterations\n", 1024 retry_count); 1025 } 1026 } 1027 1028 /* unmask Slave interrupt now */ 1029 cdns_updatel(cdns, CDNS_MCP_INTMASK, 1030 CDNS_MCP_INT_SLAVE_MASK, CDNS_MCP_INT_SLAVE_MASK); 1031 1032 } 1033 1034 /* paranoia check to make sure self-cleared bits are indeed cleared */ 1035 void sdw_cdns_check_self_clearing_bits(struct sdw_cdns *cdns, const char *string, 1036 bool initial_delay, int reset_iterations) 1037 { 1038 u32 mcp_control; 1039 u32 mcp_config_update; 1040 int i; 1041 1042 if (initial_delay) 1043 usleep_range(1000, 1500); 1044 1045 mcp_control = cdns_readl(cdns, CDNS_MCP_CONTROL); 1046 1047 /* the following bits should be cleared immediately */ 1048 if (mcp_control & CDNS_MCP_CONTROL_CMD_RST) 1049 dev_err(cdns->dev, "%s failed: MCP_CONTROL_CMD_RST is not cleared\n", string); 1050 if (mcp_control & CDNS_MCP_CONTROL_SOFT_RST) 1051 dev_err(cdns->dev, "%s failed: MCP_CONTROL_SOFT_RST is not cleared\n", string); 1052 if (mcp_control & CDNS_MCP_CONTROL_SW_RST) 1053 dev_err(cdns->dev, "%s failed: MCP_CONTROL_SW_RST is not cleared\n", string); 1054 if (mcp_control & CDNS_MCP_CONTROL_CLK_STOP_CLR) 1055 dev_err(cdns->dev, "%s failed: MCP_CONTROL_CLK_STOP_CLR is not cleared\n", string); 1056 mcp_config_update = cdns_readl(cdns, CDNS_MCP_CONFIG_UPDATE); 1057 if (mcp_config_update & CDNS_MCP_CONFIG_UPDATE_BIT) 1058 dev_err(cdns->dev, "%s failed: MCP_CONFIG_UPDATE_BIT is not cleared\n", string); 1059 1060 i = 0; 1061 while (mcp_control & CDNS_MCP_CONTROL_HW_RST) { 1062 if (i == reset_iterations) { 1063 dev_err(cdns->dev, "%s failed: MCP_CONTROL_HW_RST is not cleared\n", string); 1064 break; 1065 } 1066 1067 dev_dbg(cdns->dev, "%s: MCP_CONTROL_HW_RST is not cleared at iteration %d\n", string, i); 1068 i++; 1069 1070 usleep_range(1000, 1500); 1071 mcp_control = cdns_readl(cdns, CDNS_MCP_CONTROL); 1072 } 1073 1074 } 1075 EXPORT_SYMBOL(sdw_cdns_check_self_clearing_bits); 1076 1077 /* 1078 * init routines 1079 */ 1080 1081 /** 1082 * sdw_cdns_exit_reset() - Program reset parameters and start bus operations 1083 * @cdns: Cadence instance 1084 */ 1085 int sdw_cdns_exit_reset(struct sdw_cdns *cdns) 1086 { 1087 /* keep reset delay unchanged to 4096 cycles */ 1088 1089 /* use hardware generated reset */ 1090 cdns_updatel(cdns, CDNS_MCP_CONTROL, 1091 CDNS_MCP_CONTROL_HW_RST, 1092 CDNS_MCP_CONTROL_HW_RST); 1093 1094 /* commit changes */ 1095 cdns_updatel(cdns, CDNS_MCP_CONFIG_UPDATE, 1096 CDNS_MCP_CONFIG_UPDATE_BIT, 1097 CDNS_MCP_CONFIG_UPDATE_BIT); 1098 1099 /* don't wait here */ 1100 return 0; 1101 1102 } 1103 EXPORT_SYMBOL(sdw_cdns_exit_reset); 1104 1105 /** 1106 * cdns_enable_slave_interrupts() - Enable SDW slave interrupts 1107 * @cdns: Cadence instance 1108 * @state: boolean for true/false 1109 */ 1110 static void cdns_enable_slave_interrupts(struct sdw_cdns *cdns, bool state) 1111 { 1112 u32 mask; 1113 1114 mask = cdns_readl(cdns, CDNS_MCP_INTMASK); 1115 if (state) 1116 mask |= CDNS_MCP_INT_SLAVE_MASK; 1117 else 1118 mask &= ~CDNS_MCP_INT_SLAVE_MASK; 1119 1120 cdns_writel(cdns, CDNS_MCP_INTMASK, mask); 1121 } 1122 1123 /** 1124 * sdw_cdns_enable_interrupt() - Enable SDW interrupts 1125 * @cdns: Cadence instance 1126 * @state: True if we are trying to enable interrupt. 1127 */ 1128 int sdw_cdns_enable_interrupt(struct sdw_cdns *cdns, bool state) 1129 { 1130 u32 slave_intmask0 = 0; 1131 u32 slave_intmask1 = 0; 1132 u32 mask = 0; 1133 1134 if (!state) 1135 goto update_masks; 1136 1137 slave_intmask0 = CDNS_MCP_SLAVE_INTMASK0_MASK; 1138 slave_intmask1 = CDNS_MCP_SLAVE_INTMASK1_MASK; 1139 1140 /* enable detection of all slave state changes */ 1141 mask = CDNS_MCP_INT_SLAVE_MASK; 1142 1143 /* enable detection of bus issues */ 1144 mask |= CDNS_MCP_INT_CTRL_CLASH | CDNS_MCP_INT_DATA_CLASH | 1145 CDNS_MCP_INT_PARITY; 1146 1147 /* port interrupt limited to test modes for now */ 1148 if (cdns->bus.params.m_data_mode != SDW_PORT_DATA_MODE_NORMAL) 1149 mask |= CDNS_MCP_INT_DPINT; 1150 1151 /* enable detection of RX fifo level */ 1152 mask |= CDNS_MCP_INT_RX_WL; 1153 1154 /* 1155 * CDNS_MCP_INT_IRQ needs to be set otherwise all previous 1156 * settings are irrelevant 1157 */ 1158 mask |= CDNS_MCP_INT_IRQ; 1159 1160 if (interrupt_mask) /* parameter override */ 1161 mask = interrupt_mask; 1162 1163 update_masks: 1164 /* clear slave interrupt status before enabling interrupt */ 1165 if (state) { 1166 u32 slave_state; 1167 1168 slave_state = cdns_readl(cdns, CDNS_MCP_SLAVE_INTSTAT0); 1169 cdns_writel(cdns, CDNS_MCP_SLAVE_INTSTAT0, slave_state); 1170 slave_state = cdns_readl(cdns, CDNS_MCP_SLAVE_INTSTAT1); 1171 cdns_writel(cdns, CDNS_MCP_SLAVE_INTSTAT1, slave_state); 1172 } 1173 cdns->interrupt_enabled = state; 1174 1175 /* 1176 * Complete any on-going status updates before updating masks, 1177 * and cancel queued status updates. 1178 * 1179 * There could be a race with a new interrupt thrown before 1180 * the 3 mask updates below are complete, so in the interrupt 1181 * we use the 'interrupt_enabled' status to prevent new work 1182 * from being queued. 1183 */ 1184 if (!state) 1185 cancel_work_sync(&cdns->work); 1186 1187 cdns_writel(cdns, CDNS_MCP_SLAVE_INTMASK0, slave_intmask0); 1188 cdns_writel(cdns, CDNS_MCP_SLAVE_INTMASK1, slave_intmask1); 1189 cdns_writel(cdns, CDNS_MCP_INTMASK, mask); 1190 1191 return 0; 1192 } 1193 EXPORT_SYMBOL(sdw_cdns_enable_interrupt); 1194 1195 static int cdns_allocate_pdi(struct sdw_cdns *cdns, 1196 struct sdw_cdns_pdi **stream, 1197 u32 num, u32 pdi_offset) 1198 { 1199 struct sdw_cdns_pdi *pdi; 1200 int i; 1201 1202 if (!num) 1203 return 0; 1204 1205 pdi = devm_kcalloc(cdns->dev, num, sizeof(*pdi), GFP_KERNEL); 1206 if (!pdi) 1207 return -ENOMEM; 1208 1209 for (i = 0; i < num; i++) { 1210 pdi[i].num = i + pdi_offset; 1211 } 1212 1213 *stream = pdi; 1214 return 0; 1215 } 1216 1217 /** 1218 * sdw_cdns_pdi_init() - PDI initialization routine 1219 * 1220 * @cdns: Cadence instance 1221 * @config: Stream configurations 1222 */ 1223 int sdw_cdns_pdi_init(struct sdw_cdns *cdns, 1224 struct sdw_cdns_stream_config config) 1225 { 1226 struct sdw_cdns_streams *stream; 1227 int offset; 1228 int ret; 1229 1230 cdns->pcm.num_bd = config.pcm_bd; 1231 cdns->pcm.num_in = config.pcm_in; 1232 cdns->pcm.num_out = config.pcm_out; 1233 1234 /* Allocate PDIs for PCMs */ 1235 stream = &cdns->pcm; 1236 1237 /* we allocate PDI0 and PDI1 which are used for Bulk */ 1238 offset = 0; 1239 1240 ret = cdns_allocate_pdi(cdns, &stream->bd, 1241 stream->num_bd, offset); 1242 if (ret) 1243 return ret; 1244 1245 offset += stream->num_bd; 1246 1247 ret = cdns_allocate_pdi(cdns, &stream->in, 1248 stream->num_in, offset); 1249 if (ret) 1250 return ret; 1251 1252 offset += stream->num_in; 1253 1254 ret = cdns_allocate_pdi(cdns, &stream->out, 1255 stream->num_out, offset); 1256 if (ret) 1257 return ret; 1258 1259 /* Update total number of PCM PDIs */ 1260 stream->num_pdi = stream->num_bd + stream->num_in + stream->num_out; 1261 cdns->num_ports = stream->num_pdi; 1262 1263 return 0; 1264 } 1265 EXPORT_SYMBOL(sdw_cdns_pdi_init); 1266 1267 static u32 cdns_set_initial_frame_shape(int n_rows, int n_cols) 1268 { 1269 u32 val; 1270 int c; 1271 int r; 1272 1273 r = sdw_find_row_index(n_rows); 1274 c = sdw_find_col_index(n_cols); 1275 1276 val = FIELD_PREP(CDNS_MCP_FRAME_SHAPE_ROW_MASK, r); 1277 val |= FIELD_PREP(CDNS_MCP_FRAME_SHAPE_COL_MASK, c); 1278 1279 return val; 1280 } 1281 1282 static void cdns_init_clock_ctrl(struct sdw_cdns *cdns) 1283 { 1284 struct sdw_bus *bus = &cdns->bus; 1285 struct sdw_master_prop *prop = &bus->prop; 1286 u32 val; 1287 u32 ssp_interval; 1288 int divider; 1289 1290 /* Set clock divider */ 1291 divider = (prop->mclk_freq / prop->max_clk_freq) - 1; 1292 1293 cdns_updatel(cdns, CDNS_MCP_CLK_CTRL0, 1294 CDNS_MCP_CLK_MCLKD_MASK, divider); 1295 cdns_updatel(cdns, CDNS_MCP_CLK_CTRL1, 1296 CDNS_MCP_CLK_MCLKD_MASK, divider); 1297 1298 /* 1299 * Frame shape changes after initialization have to be done 1300 * with the bank switch mechanism 1301 */ 1302 val = cdns_set_initial_frame_shape(prop->default_row, 1303 prop->default_col); 1304 cdns_writel(cdns, CDNS_MCP_FRAME_SHAPE_INIT, val); 1305 1306 /* Set SSP interval to default value */ 1307 ssp_interval = prop->default_frame_rate / SDW_CADENCE_GSYNC_HZ; 1308 cdns_writel(cdns, CDNS_MCP_SSP_CTRL0, ssp_interval); 1309 cdns_writel(cdns, CDNS_MCP_SSP_CTRL1, ssp_interval); 1310 } 1311 1312 /** 1313 * sdw_cdns_init() - Cadence initialization 1314 * @cdns: Cadence instance 1315 */ 1316 int sdw_cdns_init(struct sdw_cdns *cdns) 1317 { 1318 u32 val; 1319 1320 cdns_init_clock_ctrl(cdns); 1321 1322 sdw_cdns_check_self_clearing_bits(cdns, __func__, false, 0); 1323 1324 /* reset msg_count to default value of FIFOLEVEL */ 1325 cdns->msg_count = cdns_readl(cdns, CDNS_MCP_FIFOLEVEL); 1326 1327 /* flush command FIFOs */ 1328 cdns_updatel(cdns, CDNS_MCP_CONTROL, CDNS_MCP_CONTROL_CMD_RST, 1329 CDNS_MCP_CONTROL_CMD_RST); 1330 1331 /* Set cmd accept mode */ 1332 cdns_updatel(cdns, CDNS_MCP_CONTROL, CDNS_MCP_CONTROL_CMD_ACCEPT, 1333 CDNS_MCP_CONTROL_CMD_ACCEPT); 1334 1335 /* Configure mcp config */ 1336 val = cdns_readl(cdns, CDNS_MCP_CONFIG); 1337 1338 /* enable bus operations with clock and data */ 1339 val &= ~CDNS_MCP_CONFIG_OP; 1340 val |= CDNS_MCP_CONFIG_OP_NORMAL; 1341 1342 /* Set cmd mode for Tx and Rx cmds */ 1343 val &= ~CDNS_MCP_CONFIG_CMD; 1344 1345 /* Disable sniffer mode */ 1346 val &= ~CDNS_MCP_CONFIG_SNIFFER; 1347 1348 /* Disable auto bus release */ 1349 val &= ~CDNS_MCP_CONFIG_BUS_REL; 1350 1351 if (cdns->bus.multi_link) 1352 /* Set Multi-master mode to take gsync into account */ 1353 val |= CDNS_MCP_CONFIG_MMASTER; 1354 1355 /* leave frame delay to hardware default of 0x1F */ 1356 1357 /* leave command retry to hardware default of 0 */ 1358 1359 cdns_writel(cdns, CDNS_MCP_CONFIG, val); 1360 1361 /* changes will be committed later */ 1362 return 0; 1363 } 1364 EXPORT_SYMBOL(sdw_cdns_init); 1365 1366 int cdns_bus_conf(struct sdw_bus *bus, struct sdw_bus_params *params) 1367 { 1368 struct sdw_master_prop *prop = &bus->prop; 1369 struct sdw_cdns *cdns = bus_to_cdns(bus); 1370 int mcp_clkctrl_off; 1371 int divider; 1372 1373 if (!params->curr_dr_freq) { 1374 dev_err(cdns->dev, "NULL curr_dr_freq\n"); 1375 return -EINVAL; 1376 } 1377 1378 divider = prop->mclk_freq * SDW_DOUBLE_RATE_FACTOR / 1379 params->curr_dr_freq; 1380 divider--; /* divider is 1/(N+1) */ 1381 1382 if (params->next_bank) 1383 mcp_clkctrl_off = CDNS_MCP_CLK_CTRL1; 1384 else 1385 mcp_clkctrl_off = CDNS_MCP_CLK_CTRL0; 1386 1387 cdns_updatel(cdns, mcp_clkctrl_off, CDNS_MCP_CLK_MCLKD_MASK, divider); 1388 1389 return 0; 1390 } 1391 EXPORT_SYMBOL(cdns_bus_conf); 1392 1393 static int cdns_port_params(struct sdw_bus *bus, 1394 struct sdw_port_params *p_params, unsigned int bank) 1395 { 1396 struct sdw_cdns *cdns = bus_to_cdns(bus); 1397 int dpn_config_off_source; 1398 int dpn_config_off_target; 1399 int target_num = p_params->num; 1400 int source_num = p_params->num; 1401 bool override = false; 1402 int dpn_config; 1403 1404 if (target_num == cdns->pdi_loopback_target && 1405 cdns->pdi_loopback_source != -1) { 1406 source_num = cdns->pdi_loopback_source; 1407 override = true; 1408 } 1409 1410 if (bank) { 1411 dpn_config_off_source = CDNS_DPN_B1_CONFIG(source_num); 1412 dpn_config_off_target = CDNS_DPN_B1_CONFIG(target_num); 1413 } else { 1414 dpn_config_off_source = CDNS_DPN_B0_CONFIG(source_num); 1415 dpn_config_off_target = CDNS_DPN_B0_CONFIG(target_num); 1416 } 1417 1418 dpn_config = cdns_readl(cdns, dpn_config_off_source); 1419 1420 /* use port params if there is no loopback, otherwise use source as is */ 1421 if (!override) { 1422 u32p_replace_bits(&dpn_config, p_params->bps - 1, CDNS_DPN_CONFIG_WL); 1423 u32p_replace_bits(&dpn_config, p_params->flow_mode, CDNS_DPN_CONFIG_PORT_FLOW); 1424 u32p_replace_bits(&dpn_config, p_params->data_mode, CDNS_DPN_CONFIG_PORT_DAT); 1425 } 1426 1427 cdns_writel(cdns, dpn_config_off_target, dpn_config); 1428 1429 return 0; 1430 } 1431 1432 static int cdns_transport_params(struct sdw_bus *bus, 1433 struct sdw_transport_params *t_params, 1434 enum sdw_reg_bank bank) 1435 { 1436 struct sdw_cdns *cdns = bus_to_cdns(bus); 1437 int dpn_config; 1438 int dpn_config_off_source; 1439 int dpn_config_off_target; 1440 int dpn_hctrl; 1441 int dpn_hctrl_off_source; 1442 int dpn_hctrl_off_target; 1443 int dpn_offsetctrl; 1444 int dpn_offsetctrl_off_source; 1445 int dpn_offsetctrl_off_target; 1446 int dpn_samplectrl; 1447 int dpn_samplectrl_off_source; 1448 int dpn_samplectrl_off_target; 1449 int source_num = t_params->port_num; 1450 int target_num = t_params->port_num; 1451 bool override = false; 1452 1453 if (target_num == cdns->pdi_loopback_target && 1454 cdns->pdi_loopback_source != -1) { 1455 source_num = cdns->pdi_loopback_source; 1456 override = true; 1457 } 1458 1459 /* 1460 * Note: Only full data port is supported on the Master side for 1461 * both PCM and PDM ports. 1462 */ 1463 1464 if (bank) { 1465 dpn_config_off_source = CDNS_DPN_B1_CONFIG(source_num); 1466 dpn_hctrl_off_source = CDNS_DPN_B1_HCTRL(source_num); 1467 dpn_offsetctrl_off_source = CDNS_DPN_B1_OFFSET_CTRL(source_num); 1468 dpn_samplectrl_off_source = CDNS_DPN_B1_SAMPLE_CTRL(source_num); 1469 1470 dpn_config_off_target = CDNS_DPN_B1_CONFIG(target_num); 1471 dpn_hctrl_off_target = CDNS_DPN_B1_HCTRL(target_num); 1472 dpn_offsetctrl_off_target = CDNS_DPN_B1_OFFSET_CTRL(target_num); 1473 dpn_samplectrl_off_target = CDNS_DPN_B1_SAMPLE_CTRL(target_num); 1474 1475 } else { 1476 dpn_config_off_source = CDNS_DPN_B0_CONFIG(source_num); 1477 dpn_hctrl_off_source = CDNS_DPN_B0_HCTRL(source_num); 1478 dpn_offsetctrl_off_source = CDNS_DPN_B0_OFFSET_CTRL(source_num); 1479 dpn_samplectrl_off_source = CDNS_DPN_B0_SAMPLE_CTRL(source_num); 1480 1481 dpn_config_off_target = CDNS_DPN_B0_CONFIG(target_num); 1482 dpn_hctrl_off_target = CDNS_DPN_B0_HCTRL(target_num); 1483 dpn_offsetctrl_off_target = CDNS_DPN_B0_OFFSET_CTRL(target_num); 1484 dpn_samplectrl_off_target = CDNS_DPN_B0_SAMPLE_CTRL(target_num); 1485 } 1486 1487 dpn_config = cdns_readl(cdns, dpn_config_off_source); 1488 if (!override) { 1489 u32p_replace_bits(&dpn_config, t_params->blk_grp_ctrl, CDNS_DPN_CONFIG_BGC); 1490 u32p_replace_bits(&dpn_config, t_params->blk_pkg_mode, CDNS_DPN_CONFIG_BPM); 1491 } 1492 cdns_writel(cdns, dpn_config_off_target, dpn_config); 1493 1494 if (!override) { 1495 dpn_offsetctrl = 0; 1496 u32p_replace_bits(&dpn_offsetctrl, t_params->offset1, CDNS_DPN_OFFSET_CTRL_1); 1497 u32p_replace_bits(&dpn_offsetctrl, t_params->offset2, CDNS_DPN_OFFSET_CTRL_2); 1498 } else { 1499 dpn_offsetctrl = cdns_readl(cdns, dpn_offsetctrl_off_source); 1500 } 1501 cdns_writel(cdns, dpn_offsetctrl_off_target, dpn_offsetctrl); 1502 1503 if (!override) { 1504 dpn_hctrl = 0; 1505 u32p_replace_bits(&dpn_hctrl, t_params->hstart, CDNS_DPN_HCTRL_HSTART); 1506 u32p_replace_bits(&dpn_hctrl, t_params->hstop, CDNS_DPN_HCTRL_HSTOP); 1507 u32p_replace_bits(&dpn_hctrl, t_params->lane_ctrl, CDNS_DPN_HCTRL_LCTRL); 1508 } else { 1509 dpn_hctrl = cdns_readl(cdns, dpn_hctrl_off_source); 1510 } 1511 cdns_writel(cdns, dpn_hctrl_off_target, dpn_hctrl); 1512 1513 if (!override) 1514 dpn_samplectrl = t_params->sample_interval - 1; 1515 else 1516 dpn_samplectrl = cdns_readl(cdns, dpn_samplectrl_off_source); 1517 cdns_writel(cdns, dpn_samplectrl_off_target, dpn_samplectrl); 1518 1519 return 0; 1520 } 1521 1522 static int cdns_port_enable(struct sdw_bus *bus, 1523 struct sdw_enable_ch *enable_ch, unsigned int bank) 1524 { 1525 struct sdw_cdns *cdns = bus_to_cdns(bus); 1526 int dpn_chnen_off, ch_mask; 1527 1528 if (bank) 1529 dpn_chnen_off = CDNS_DPN_B1_CH_EN(enable_ch->port_num); 1530 else 1531 dpn_chnen_off = CDNS_DPN_B0_CH_EN(enable_ch->port_num); 1532 1533 ch_mask = enable_ch->ch_mask * enable_ch->enable; 1534 cdns_writel(cdns, dpn_chnen_off, ch_mask); 1535 1536 return 0; 1537 } 1538 1539 static const struct sdw_master_port_ops cdns_port_ops = { 1540 .dpn_set_port_params = cdns_port_params, 1541 .dpn_set_port_transport_params = cdns_transport_params, 1542 .dpn_port_enable_ch = cdns_port_enable, 1543 }; 1544 1545 /** 1546 * sdw_cdns_is_clock_stop: Check clock status 1547 * 1548 * @cdns: Cadence instance 1549 */ 1550 bool sdw_cdns_is_clock_stop(struct sdw_cdns *cdns) 1551 { 1552 return !!(cdns_readl(cdns, CDNS_MCP_STAT) & CDNS_MCP_STAT_CLK_STOP); 1553 } 1554 EXPORT_SYMBOL(sdw_cdns_is_clock_stop); 1555 1556 /** 1557 * sdw_cdns_clock_stop: Cadence clock stop configuration routine 1558 * 1559 * @cdns: Cadence instance 1560 * @block_wake: prevent wakes if required by the platform 1561 */ 1562 int sdw_cdns_clock_stop(struct sdw_cdns *cdns, bool block_wake) 1563 { 1564 bool slave_present = false; 1565 struct sdw_slave *slave; 1566 int ret; 1567 1568 sdw_cdns_check_self_clearing_bits(cdns, __func__, false, 0); 1569 1570 /* Check suspend status */ 1571 if (sdw_cdns_is_clock_stop(cdns)) { 1572 dev_dbg(cdns->dev, "Clock is already stopped\n"); 1573 return 0; 1574 } 1575 1576 /* 1577 * Before entering clock stop we mask the Slave 1578 * interrupts. This helps avoid having to deal with e.g. a 1579 * Slave becoming UNATTACHED while the clock is being stopped 1580 */ 1581 cdns_enable_slave_interrupts(cdns, false); 1582 1583 /* 1584 * For specific platforms, it is required to be able to put 1585 * master into a state in which it ignores wake-up trials 1586 * in clock stop state 1587 */ 1588 if (block_wake) 1589 cdns_updatel(cdns, CDNS_MCP_CONTROL, 1590 CDNS_MCP_CONTROL_BLOCK_WAKEUP, 1591 CDNS_MCP_CONTROL_BLOCK_WAKEUP); 1592 1593 list_for_each_entry(slave, &cdns->bus.slaves, node) { 1594 if (slave->status == SDW_SLAVE_ATTACHED || 1595 slave->status == SDW_SLAVE_ALERT) { 1596 slave_present = true; 1597 break; 1598 } 1599 } 1600 1601 /* commit changes */ 1602 ret = cdns_config_update(cdns); 1603 if (ret < 0) { 1604 dev_err(cdns->dev, "%s: config_update failed\n", __func__); 1605 return ret; 1606 } 1607 1608 /* Prepare slaves for clock stop */ 1609 if (slave_present) { 1610 ret = sdw_bus_prep_clk_stop(&cdns->bus); 1611 if (ret < 0 && ret != -ENODATA) { 1612 dev_err(cdns->dev, "prepare clock stop failed %d\n", ret); 1613 return ret; 1614 } 1615 } 1616 1617 /* 1618 * Enter clock stop mode and only report errors if there are 1619 * Slave devices present (ALERT or ATTACHED) 1620 */ 1621 ret = sdw_bus_clk_stop(&cdns->bus); 1622 if (ret < 0 && slave_present && ret != -ENODATA) { 1623 dev_err(cdns->dev, "bus clock stop failed %d\n", ret); 1624 return ret; 1625 } 1626 1627 ret = cdns_set_wait(cdns, CDNS_MCP_STAT, 1628 CDNS_MCP_STAT_CLK_STOP, 1629 CDNS_MCP_STAT_CLK_STOP); 1630 if (ret < 0) 1631 dev_err(cdns->dev, "Clock stop failed %d\n", ret); 1632 1633 return ret; 1634 } 1635 EXPORT_SYMBOL(sdw_cdns_clock_stop); 1636 1637 /** 1638 * sdw_cdns_clock_restart: Cadence PM clock restart configuration routine 1639 * 1640 * @cdns: Cadence instance 1641 * @bus_reset: context may be lost while in low power modes and the bus 1642 * may require a Severe Reset and re-enumeration after a wake. 1643 */ 1644 int sdw_cdns_clock_restart(struct sdw_cdns *cdns, bool bus_reset) 1645 { 1646 int ret; 1647 1648 /* unmask Slave interrupts that were masked when stopping the clock */ 1649 cdns_enable_slave_interrupts(cdns, true); 1650 1651 ret = cdns_clear_bit(cdns, CDNS_MCP_CONTROL, 1652 CDNS_MCP_CONTROL_CLK_STOP_CLR); 1653 if (ret < 0) { 1654 dev_err(cdns->dev, "Couldn't exit from clock stop\n"); 1655 return ret; 1656 } 1657 1658 ret = cdns_set_wait(cdns, CDNS_MCP_STAT, CDNS_MCP_STAT_CLK_STOP, 0); 1659 if (ret < 0) { 1660 dev_err(cdns->dev, "clock stop exit failed %d\n", ret); 1661 return ret; 1662 } 1663 1664 cdns_updatel(cdns, CDNS_MCP_CONTROL, 1665 CDNS_MCP_CONTROL_BLOCK_WAKEUP, 0); 1666 1667 cdns_updatel(cdns, CDNS_MCP_CONTROL, CDNS_MCP_CONTROL_CMD_ACCEPT, 1668 CDNS_MCP_CONTROL_CMD_ACCEPT); 1669 1670 if (!bus_reset) { 1671 1672 /* enable bus operations with clock and data */ 1673 cdns_updatel(cdns, CDNS_MCP_CONFIG, 1674 CDNS_MCP_CONFIG_OP, 1675 CDNS_MCP_CONFIG_OP_NORMAL); 1676 1677 ret = cdns_config_update(cdns); 1678 if (ret < 0) { 1679 dev_err(cdns->dev, "%s: config_update failed\n", __func__); 1680 return ret; 1681 } 1682 1683 ret = sdw_bus_exit_clk_stop(&cdns->bus); 1684 if (ret < 0) 1685 dev_err(cdns->dev, "bus failed to exit clock stop %d\n", ret); 1686 } 1687 1688 return ret; 1689 } 1690 EXPORT_SYMBOL(sdw_cdns_clock_restart); 1691 1692 /** 1693 * sdw_cdns_probe() - Cadence probe routine 1694 * @cdns: Cadence instance 1695 */ 1696 int sdw_cdns_probe(struct sdw_cdns *cdns) 1697 { 1698 init_completion(&cdns->tx_complete); 1699 cdns->bus.port_ops = &cdns_port_ops; 1700 1701 INIT_WORK(&cdns->work, cdns_update_slave_status_work); 1702 return 0; 1703 } 1704 EXPORT_SYMBOL(sdw_cdns_probe); 1705 1706 int cdns_set_sdw_stream(struct snd_soc_dai *dai, 1707 void *stream, int direction) 1708 { 1709 struct sdw_cdns *cdns = snd_soc_dai_get_drvdata(dai); 1710 struct sdw_cdns_dma_data *dma; 1711 1712 if (stream) { 1713 /* first paranoia check */ 1714 if (direction == SNDRV_PCM_STREAM_PLAYBACK) 1715 dma = dai->playback_dma_data; 1716 else 1717 dma = dai->capture_dma_data; 1718 1719 if (dma) { 1720 dev_err(dai->dev, 1721 "dma_data already allocated for dai %s\n", 1722 dai->name); 1723 return -EINVAL; 1724 } 1725 1726 /* allocate and set dma info */ 1727 dma = kzalloc(sizeof(*dma), GFP_KERNEL); 1728 if (!dma) 1729 return -ENOMEM; 1730 1731 dma->stream_type = SDW_STREAM_PCM; 1732 1733 dma->bus = &cdns->bus; 1734 dma->link_id = cdns->instance; 1735 1736 dma->stream = stream; 1737 1738 if (direction == SNDRV_PCM_STREAM_PLAYBACK) 1739 dai->playback_dma_data = dma; 1740 else 1741 dai->capture_dma_data = dma; 1742 } else { 1743 /* for NULL stream we release allocated dma_data */ 1744 if (direction == SNDRV_PCM_STREAM_PLAYBACK) { 1745 kfree(dai->playback_dma_data); 1746 dai->playback_dma_data = NULL; 1747 } else { 1748 kfree(dai->capture_dma_data); 1749 dai->capture_dma_data = NULL; 1750 } 1751 } 1752 return 0; 1753 } 1754 EXPORT_SYMBOL(cdns_set_sdw_stream); 1755 1756 /** 1757 * cdns_find_pdi() - Find a free PDI 1758 * 1759 * @cdns: Cadence instance 1760 * @offset: Starting offset 1761 * @num: Number of PDIs 1762 * @pdi: PDI instances 1763 * @dai_id: DAI id 1764 * 1765 * Find a PDI for a given PDI array. The PDI num and dai_id are 1766 * expected to match, return NULL otherwise. 1767 */ 1768 static struct sdw_cdns_pdi *cdns_find_pdi(struct sdw_cdns *cdns, 1769 unsigned int offset, 1770 unsigned int num, 1771 struct sdw_cdns_pdi *pdi, 1772 int dai_id) 1773 { 1774 int i; 1775 1776 for (i = offset; i < offset + num; i++) 1777 if (pdi[i].num == dai_id) 1778 return &pdi[i]; 1779 1780 return NULL; 1781 } 1782 1783 /** 1784 * sdw_cdns_config_stream: Configure a stream 1785 * 1786 * @cdns: Cadence instance 1787 * @ch: Channel count 1788 * @dir: Data direction 1789 * @pdi: PDI to be used 1790 */ 1791 void sdw_cdns_config_stream(struct sdw_cdns *cdns, 1792 u32 ch, u32 dir, struct sdw_cdns_pdi *pdi) 1793 { 1794 u32 offset, val = 0; 1795 1796 if (dir == SDW_DATA_DIR_RX) { 1797 val = CDNS_PORTCTRL_DIRN; 1798 1799 if (cdns->bus.params.m_data_mode != SDW_PORT_DATA_MODE_NORMAL) 1800 val |= CDNS_PORTCTRL_TEST_FAILED; 1801 } 1802 offset = CDNS_PORTCTRL + pdi->num * CDNS_PORT_OFFSET; 1803 cdns_updatel(cdns, offset, 1804 CDNS_PORTCTRL_DIRN | CDNS_PORTCTRL_TEST_FAILED, 1805 val); 1806 1807 val = pdi->num; 1808 val |= CDNS_PDI_CONFIG_SOFT_RESET; 1809 val |= FIELD_PREP(CDNS_PDI_CONFIG_CHANNEL, (1 << ch) - 1); 1810 cdns_writel(cdns, CDNS_PDI_CONFIG(pdi->num), val); 1811 } 1812 EXPORT_SYMBOL(sdw_cdns_config_stream); 1813 1814 /** 1815 * sdw_cdns_alloc_pdi() - Allocate a PDI 1816 * 1817 * @cdns: Cadence instance 1818 * @stream: Stream to be allocated 1819 * @ch: Channel count 1820 * @dir: Data direction 1821 * @dai_id: DAI id 1822 */ 1823 struct sdw_cdns_pdi *sdw_cdns_alloc_pdi(struct sdw_cdns *cdns, 1824 struct sdw_cdns_streams *stream, 1825 u32 ch, u32 dir, int dai_id) 1826 { 1827 struct sdw_cdns_pdi *pdi = NULL; 1828 1829 if (dir == SDW_DATA_DIR_RX) 1830 pdi = cdns_find_pdi(cdns, 0, stream->num_in, stream->in, 1831 dai_id); 1832 else 1833 pdi = cdns_find_pdi(cdns, 0, stream->num_out, stream->out, 1834 dai_id); 1835 1836 /* check if we found a PDI, else find in bi-directional */ 1837 if (!pdi) 1838 pdi = cdns_find_pdi(cdns, 2, stream->num_bd, stream->bd, 1839 dai_id); 1840 1841 if (pdi) { 1842 pdi->l_ch_num = 0; 1843 pdi->h_ch_num = ch - 1; 1844 pdi->dir = dir; 1845 pdi->ch_count = ch; 1846 } 1847 1848 return pdi; 1849 } 1850 EXPORT_SYMBOL(sdw_cdns_alloc_pdi); 1851 1852 MODULE_LICENSE("Dual BSD/GPL"); 1853 MODULE_DESCRIPTION("Cadence Soundwire Library"); 1854