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 * sdw_cdns_config_update() - Update configurations 288 * @cdns: Cadence instance 289 */ 290 void sdw_cdns_config_update(struct sdw_cdns *cdns) 291 { 292 /* commit changes */ 293 cdns_writel(cdns, CDNS_MCP_CONFIG_UPDATE, CDNS_MCP_CONFIG_UPDATE_BIT); 294 } 295 EXPORT_SYMBOL(sdw_cdns_config_update); 296 297 /** 298 * sdw_cdns_config_update_set_wait() - wait until configuration update bit is self-cleared 299 * @cdns: Cadence instance 300 */ 301 int sdw_cdns_config_update_set_wait(struct sdw_cdns *cdns) 302 { 303 /* the hardware recommendation is to wait at least 300us */ 304 return cdns_set_wait(cdns, CDNS_MCP_CONFIG_UPDATE, 305 CDNS_MCP_CONFIG_UPDATE_BIT, 0); 306 } 307 EXPORT_SYMBOL(sdw_cdns_config_update_set_wait); 308 309 /* 310 * debugfs 311 */ 312 #ifdef CONFIG_DEBUG_FS 313 314 #define RD_BUF (2 * PAGE_SIZE) 315 316 static ssize_t cdns_sprintf(struct sdw_cdns *cdns, 317 char *buf, size_t pos, unsigned int reg) 318 { 319 return scnprintf(buf + pos, RD_BUF - pos, 320 "%4x\t%8x\n", reg, cdns_readl(cdns, reg)); 321 } 322 323 static int cdns_reg_show(struct seq_file *s, void *data) 324 { 325 struct sdw_cdns *cdns = s->private; 326 char *buf; 327 ssize_t ret; 328 int num_ports; 329 int i, j; 330 331 buf = kzalloc(RD_BUF, GFP_KERNEL); 332 if (!buf) 333 return -ENOMEM; 334 335 ret = scnprintf(buf, RD_BUF, "Register Value\n"); 336 ret += scnprintf(buf + ret, RD_BUF - ret, "\nMCP Registers\n"); 337 /* 8 MCP registers */ 338 for (i = CDNS_MCP_CONFIG; i <= CDNS_MCP_PHYCTRL; i += sizeof(u32)) 339 ret += cdns_sprintf(cdns, buf, ret, i); 340 341 ret += scnprintf(buf + ret, RD_BUF - ret, 342 "\nStatus & Intr Registers\n"); 343 /* 13 Status & Intr registers (offsets 0x70 and 0x74 not defined) */ 344 for (i = CDNS_MCP_STAT; i <= CDNS_MCP_FIFOSTAT; i += sizeof(u32)) 345 ret += cdns_sprintf(cdns, buf, ret, i); 346 347 ret += scnprintf(buf + ret, RD_BUF - ret, 348 "\nSSP & Clk ctrl Registers\n"); 349 ret += cdns_sprintf(cdns, buf, ret, CDNS_MCP_SSP_CTRL0); 350 ret += cdns_sprintf(cdns, buf, ret, CDNS_MCP_SSP_CTRL1); 351 ret += cdns_sprintf(cdns, buf, ret, CDNS_MCP_CLK_CTRL0); 352 ret += cdns_sprintf(cdns, buf, ret, CDNS_MCP_CLK_CTRL1); 353 354 ret += scnprintf(buf + ret, RD_BUF - ret, 355 "\nDPn B0 Registers\n"); 356 357 num_ports = cdns->num_ports; 358 359 for (i = 0; i < num_ports; i++) { 360 ret += scnprintf(buf + ret, RD_BUF - ret, 361 "\nDP-%d\n", i); 362 for (j = CDNS_DPN_B0_CONFIG(i); 363 j < CDNS_DPN_B0_ASYNC_CTRL(i); j += sizeof(u32)) 364 ret += cdns_sprintf(cdns, buf, ret, j); 365 } 366 367 ret += scnprintf(buf + ret, RD_BUF - ret, 368 "\nDPn B1 Registers\n"); 369 for (i = 0; i < num_ports; i++) { 370 ret += scnprintf(buf + ret, RD_BUF - ret, 371 "\nDP-%d\n", i); 372 373 for (j = CDNS_DPN_B1_CONFIG(i); 374 j < CDNS_DPN_B1_ASYNC_CTRL(i); j += sizeof(u32)) 375 ret += cdns_sprintf(cdns, buf, ret, j); 376 } 377 378 ret += scnprintf(buf + ret, RD_BUF - ret, 379 "\nDPn Control Registers\n"); 380 for (i = 0; i < num_ports; i++) 381 ret += cdns_sprintf(cdns, buf, ret, 382 CDNS_PORTCTRL + i * CDNS_PORT_OFFSET); 383 384 ret += scnprintf(buf + ret, RD_BUF - ret, 385 "\nPDIn Config Registers\n"); 386 387 /* number of PDI and ports is interchangeable */ 388 for (i = 0; i < num_ports; i++) 389 ret += cdns_sprintf(cdns, buf, ret, CDNS_PDI_CONFIG(i)); 390 391 seq_printf(s, "%s", buf); 392 kfree(buf); 393 394 return 0; 395 } 396 DEFINE_SHOW_ATTRIBUTE(cdns_reg); 397 398 static int cdns_hw_reset(void *data, u64 value) 399 { 400 struct sdw_cdns *cdns = data; 401 int ret; 402 403 if (value != 1) 404 return -EINVAL; 405 406 /* Userspace changed the hardware state behind the kernel's back */ 407 add_taint(TAINT_USER, LOCKDEP_STILL_OK); 408 409 ret = sdw_cdns_exit_reset(cdns); 410 411 dev_dbg(cdns->dev, "link hw_reset done: %d\n", ret); 412 413 return ret; 414 } 415 416 DEFINE_DEBUGFS_ATTRIBUTE(cdns_hw_reset_fops, NULL, cdns_hw_reset, "%llu\n"); 417 418 static int cdns_parity_error_injection(void *data, u64 value) 419 { 420 struct sdw_cdns *cdns = data; 421 struct sdw_bus *bus; 422 int ret; 423 424 if (value != 1) 425 return -EINVAL; 426 427 bus = &cdns->bus; 428 429 /* 430 * Resume Master device. If this results in a bus reset, the 431 * Slave devices will re-attach and be re-enumerated. 432 */ 433 ret = pm_runtime_resume_and_get(bus->dev); 434 if (ret < 0 && ret != -EACCES) { 435 dev_err_ratelimited(cdns->dev, 436 "pm_runtime_resume_and_get failed in %s, ret %d\n", 437 __func__, ret); 438 return ret; 439 } 440 441 /* 442 * wait long enough for Slave(s) to be in steady state. This 443 * does not need to be super precise. 444 */ 445 msleep(200); 446 447 /* 448 * Take the bus lock here to make sure that any bus transactions 449 * will be queued while we inject a parity error on a dummy read 450 */ 451 mutex_lock(&bus->bus_lock); 452 453 /* program hardware to inject parity error */ 454 cdns_ip_updatel(cdns, CDNS_IP_MCP_CMDCTRL, 455 CDNS_IP_MCP_CMDCTRL_INSERT_PARITY_ERR, 456 CDNS_IP_MCP_CMDCTRL_INSERT_PARITY_ERR); 457 458 /* commit changes */ 459 cdns_updatel(cdns, CDNS_MCP_CONFIG_UPDATE, 460 CDNS_MCP_CONFIG_UPDATE_BIT, 461 CDNS_MCP_CONFIG_UPDATE_BIT); 462 463 /* do a broadcast dummy read to avoid bus clashes */ 464 ret = sdw_bread_no_pm_unlocked(&cdns->bus, 0xf, SDW_SCP_DEVID_0); 465 dev_info(cdns->dev, "parity error injection, read: %d\n", ret); 466 467 /* program hardware to disable parity error */ 468 cdns_ip_updatel(cdns, CDNS_IP_MCP_CMDCTRL, 469 CDNS_IP_MCP_CMDCTRL_INSERT_PARITY_ERR, 470 0); 471 472 /* commit changes */ 473 cdns_updatel(cdns, CDNS_MCP_CONFIG_UPDATE, 474 CDNS_MCP_CONFIG_UPDATE_BIT, 475 CDNS_MCP_CONFIG_UPDATE_BIT); 476 477 /* Continue bus operation with parity error injection disabled */ 478 mutex_unlock(&bus->bus_lock); 479 480 /* Userspace changed the hardware state behind the kernel's back */ 481 add_taint(TAINT_USER, LOCKDEP_STILL_OK); 482 483 /* 484 * allow Master device to enter pm_runtime suspend. This may 485 * also result in Slave devices suspending. 486 */ 487 pm_runtime_mark_last_busy(bus->dev); 488 pm_runtime_put_autosuspend(bus->dev); 489 490 return 0; 491 } 492 493 DEFINE_DEBUGFS_ATTRIBUTE(cdns_parity_error_fops, NULL, 494 cdns_parity_error_injection, "%llu\n"); 495 496 static int cdns_set_pdi_loopback_source(void *data, u64 value) 497 { 498 struct sdw_cdns *cdns = data; 499 unsigned int pdi_out_num = cdns->pcm.num_bd + cdns->pcm.num_out; 500 501 if (value > pdi_out_num) 502 return -EINVAL; 503 504 /* Userspace changed the hardware state behind the kernel's back */ 505 add_taint(TAINT_USER, LOCKDEP_STILL_OK); 506 507 cdns->pdi_loopback_source = value; 508 509 return 0; 510 } 511 DEFINE_DEBUGFS_ATTRIBUTE(cdns_pdi_loopback_source_fops, NULL, cdns_set_pdi_loopback_source, "%llu\n"); 512 513 static int cdns_set_pdi_loopback_target(void *data, u64 value) 514 { 515 struct sdw_cdns *cdns = data; 516 unsigned int pdi_in_num = cdns->pcm.num_bd + cdns->pcm.num_in; 517 518 if (value > pdi_in_num) 519 return -EINVAL; 520 521 /* Userspace changed the hardware state behind the kernel's back */ 522 add_taint(TAINT_USER, LOCKDEP_STILL_OK); 523 524 cdns->pdi_loopback_target = value; 525 526 return 0; 527 } 528 DEFINE_DEBUGFS_ATTRIBUTE(cdns_pdi_loopback_target_fops, NULL, cdns_set_pdi_loopback_target, "%llu\n"); 529 530 /** 531 * sdw_cdns_debugfs_init() - Cadence debugfs init 532 * @cdns: Cadence instance 533 * @root: debugfs root 534 */ 535 void sdw_cdns_debugfs_init(struct sdw_cdns *cdns, struct dentry *root) 536 { 537 debugfs_create_file("cdns-registers", 0400, root, cdns, &cdns_reg_fops); 538 539 debugfs_create_file("cdns-hw-reset", 0200, root, cdns, 540 &cdns_hw_reset_fops); 541 542 debugfs_create_file("cdns-parity-error-injection", 0200, root, cdns, 543 &cdns_parity_error_fops); 544 545 cdns->pdi_loopback_source = -1; 546 cdns->pdi_loopback_target = -1; 547 548 debugfs_create_file("cdns-pdi-loopback-source", 0200, root, cdns, 549 &cdns_pdi_loopback_source_fops); 550 551 debugfs_create_file("cdns-pdi-loopback-target", 0200, root, cdns, 552 &cdns_pdi_loopback_target_fops); 553 554 } 555 EXPORT_SYMBOL_GPL(sdw_cdns_debugfs_init); 556 557 #endif /* CONFIG_DEBUG_FS */ 558 559 /* 560 * IO Calls 561 */ 562 static enum sdw_command_response 563 cdns_fill_msg_resp(struct sdw_cdns *cdns, 564 struct sdw_msg *msg, int count, int offset) 565 { 566 int nack = 0, no_ack = 0; 567 int i; 568 569 /* check message response */ 570 for (i = 0; i < count; i++) { 571 if (!(cdns->response_buf[i] & CDNS_MCP_RESP_ACK)) { 572 no_ack = 1; 573 dev_vdbg(cdns->dev, "Msg Ack not received, cmd %d\n", i); 574 } 575 if (cdns->response_buf[i] & CDNS_MCP_RESP_NACK) { 576 nack = 1; 577 dev_err_ratelimited(cdns->dev, "Msg NACK received, cmd %d\n", i); 578 } 579 } 580 581 if (nack) { 582 dev_err_ratelimited(cdns->dev, "Msg NACKed for Slave %d\n", msg->dev_num); 583 return SDW_CMD_FAIL; 584 } 585 586 if (no_ack) { 587 dev_dbg_ratelimited(cdns->dev, "Msg ignored for Slave %d\n", msg->dev_num); 588 return SDW_CMD_IGNORED; 589 } 590 591 if (msg->flags == SDW_MSG_FLAG_READ) { 592 /* fill response */ 593 for (i = 0; i < count; i++) 594 msg->buf[i + offset] = FIELD_GET(CDNS_MCP_RESP_RDATA, 595 cdns->response_buf[i]); 596 } 597 598 return SDW_CMD_OK; 599 } 600 601 static void cdns_read_response(struct sdw_cdns *cdns) 602 { 603 u32 num_resp, cmd_base; 604 int i; 605 606 /* RX_FIFO_AVAIL can be 2 entries more than the FIFO size */ 607 BUILD_BUG_ON(ARRAY_SIZE(cdns->response_buf) < CDNS_MCP_CMD_LEN + 2); 608 609 num_resp = cdns_readl(cdns, CDNS_MCP_FIFOSTAT); 610 num_resp &= CDNS_MCP_RX_FIFO_AVAIL; 611 if (num_resp > ARRAY_SIZE(cdns->response_buf)) { 612 dev_warn(cdns->dev, "RX AVAIL %d too long\n", num_resp); 613 num_resp = ARRAY_SIZE(cdns->response_buf); 614 } 615 616 cmd_base = CDNS_IP_MCP_CMD_BASE; 617 618 for (i = 0; i < num_resp; i++) { 619 cdns->response_buf[i] = cdns_ip_readl(cdns, cmd_base); 620 cmd_base += CDNS_MCP_CMD_WORD_LEN; 621 } 622 } 623 624 static enum sdw_command_response 625 _cdns_xfer_msg(struct sdw_cdns *cdns, struct sdw_msg *msg, int cmd, 626 int offset, int count, bool defer) 627 { 628 unsigned long time; 629 u32 base, i, data; 630 u16 addr; 631 632 /* Program the watermark level for RX FIFO */ 633 if (cdns->msg_count != count) { 634 cdns_writel(cdns, CDNS_MCP_FIFOLEVEL, count); 635 cdns->msg_count = count; 636 } 637 638 base = CDNS_IP_MCP_CMD_BASE; 639 addr = msg->addr + offset; 640 641 for (i = 0; i < count; i++) { 642 data = FIELD_PREP(CDNS_MCP_CMD_DEV_ADDR, msg->dev_num); 643 data |= FIELD_PREP(CDNS_MCP_CMD_COMMAND, cmd); 644 data |= FIELD_PREP(CDNS_MCP_CMD_REG_ADDR, addr); 645 addr++; 646 647 if (msg->flags == SDW_MSG_FLAG_WRITE) 648 data |= msg->buf[i + offset]; 649 650 data |= FIELD_PREP(CDNS_MCP_CMD_SSP_TAG, msg->ssp_sync); 651 cdns_ip_writel(cdns, base, data); 652 base += CDNS_MCP_CMD_WORD_LEN; 653 } 654 655 if (defer) 656 return SDW_CMD_OK; 657 658 /* wait for timeout or response */ 659 time = wait_for_completion_timeout(&cdns->tx_complete, 660 msecs_to_jiffies(CDNS_TX_TIMEOUT)); 661 if (!time) { 662 dev_err(cdns->dev, "IO transfer timed out, cmd %d device %d addr %x len %d\n", 663 cmd, msg->dev_num, msg->addr, msg->len); 664 msg->len = 0; 665 666 /* Drain anything in the RX_FIFO */ 667 cdns_read_response(cdns); 668 669 return SDW_CMD_TIMEOUT; 670 } 671 672 return cdns_fill_msg_resp(cdns, msg, count, offset); 673 } 674 675 static enum sdw_command_response 676 cdns_program_scp_addr(struct sdw_cdns *cdns, struct sdw_msg *msg) 677 { 678 int nack = 0, no_ack = 0; 679 unsigned long time; 680 u32 data[2], base; 681 int i; 682 683 /* Program the watermark level for RX FIFO */ 684 if (cdns->msg_count != CDNS_SCP_RX_FIFOLEVEL) { 685 cdns_writel(cdns, CDNS_MCP_FIFOLEVEL, CDNS_SCP_RX_FIFOLEVEL); 686 cdns->msg_count = CDNS_SCP_RX_FIFOLEVEL; 687 } 688 689 data[0] = FIELD_PREP(CDNS_MCP_CMD_DEV_ADDR, msg->dev_num); 690 data[0] |= FIELD_PREP(CDNS_MCP_CMD_COMMAND, 0x3); 691 data[1] = data[0]; 692 693 data[0] |= FIELD_PREP(CDNS_MCP_CMD_REG_ADDR, SDW_SCP_ADDRPAGE1); 694 data[1] |= FIELD_PREP(CDNS_MCP_CMD_REG_ADDR, SDW_SCP_ADDRPAGE2); 695 696 data[0] |= msg->addr_page1; 697 data[1] |= msg->addr_page2; 698 699 base = CDNS_IP_MCP_CMD_BASE; 700 cdns_ip_writel(cdns, base, data[0]); 701 base += CDNS_MCP_CMD_WORD_LEN; 702 cdns_ip_writel(cdns, base, data[1]); 703 704 time = wait_for_completion_timeout(&cdns->tx_complete, 705 msecs_to_jiffies(CDNS_TX_TIMEOUT)); 706 if (!time) { 707 dev_err(cdns->dev, "SCP Msg trf timed out\n"); 708 msg->len = 0; 709 return SDW_CMD_TIMEOUT; 710 } 711 712 /* check response the writes */ 713 for (i = 0; i < 2; i++) { 714 if (!(cdns->response_buf[i] & CDNS_MCP_RESP_ACK)) { 715 no_ack = 1; 716 dev_err(cdns->dev, "Program SCP Ack not received\n"); 717 if (cdns->response_buf[i] & CDNS_MCP_RESP_NACK) { 718 nack = 1; 719 dev_err(cdns->dev, "Program SCP NACK received\n"); 720 } 721 } 722 } 723 724 /* For NACK, NO ack, don't return err if we are in Broadcast mode */ 725 if (nack) { 726 dev_err_ratelimited(cdns->dev, 727 "SCP_addrpage NACKed for Slave %d\n", msg->dev_num); 728 return SDW_CMD_FAIL; 729 } 730 731 if (no_ack) { 732 dev_dbg_ratelimited(cdns->dev, 733 "SCP_addrpage ignored for Slave %d\n", msg->dev_num); 734 return SDW_CMD_IGNORED; 735 } 736 737 return SDW_CMD_OK; 738 } 739 740 static int cdns_prep_msg(struct sdw_cdns *cdns, struct sdw_msg *msg, int *cmd) 741 { 742 int ret; 743 744 if (msg->page) { 745 ret = cdns_program_scp_addr(cdns, msg); 746 if (ret) { 747 msg->len = 0; 748 return ret; 749 } 750 } 751 752 switch (msg->flags) { 753 case SDW_MSG_FLAG_READ: 754 *cmd = CDNS_MCP_CMD_READ; 755 break; 756 757 case SDW_MSG_FLAG_WRITE: 758 *cmd = CDNS_MCP_CMD_WRITE; 759 break; 760 761 default: 762 dev_err(cdns->dev, "Invalid msg cmd: %d\n", msg->flags); 763 return -EINVAL; 764 } 765 766 return 0; 767 } 768 769 enum sdw_command_response 770 cdns_xfer_msg(struct sdw_bus *bus, struct sdw_msg *msg) 771 { 772 struct sdw_cdns *cdns = bus_to_cdns(bus); 773 int cmd = 0, ret, i; 774 775 ret = cdns_prep_msg(cdns, msg, &cmd); 776 if (ret) 777 return SDW_CMD_FAIL_OTHER; 778 779 for (i = 0; i < msg->len / CDNS_MCP_CMD_LEN; i++) { 780 ret = _cdns_xfer_msg(cdns, msg, cmd, i * CDNS_MCP_CMD_LEN, 781 CDNS_MCP_CMD_LEN, false); 782 if (ret != SDW_CMD_OK) 783 return ret; 784 } 785 786 if (!(msg->len % CDNS_MCP_CMD_LEN)) 787 return SDW_CMD_OK; 788 789 return _cdns_xfer_msg(cdns, msg, cmd, i * CDNS_MCP_CMD_LEN, 790 msg->len % CDNS_MCP_CMD_LEN, false); 791 } 792 EXPORT_SYMBOL(cdns_xfer_msg); 793 794 enum sdw_command_response 795 cdns_xfer_msg_defer(struct sdw_bus *bus) 796 { 797 struct sdw_cdns *cdns = bus_to_cdns(bus); 798 struct sdw_defer *defer = &bus->defer_msg; 799 struct sdw_msg *msg = defer->msg; 800 int cmd = 0, ret; 801 802 /* for defer only 1 message is supported */ 803 if (msg->len > 1) 804 return -ENOTSUPP; 805 806 ret = cdns_prep_msg(cdns, msg, &cmd); 807 if (ret) 808 return SDW_CMD_FAIL_OTHER; 809 810 return _cdns_xfer_msg(cdns, msg, cmd, 0, msg->len, true); 811 } 812 EXPORT_SYMBOL(cdns_xfer_msg_defer); 813 814 u32 cdns_read_ping_status(struct sdw_bus *bus) 815 { 816 struct sdw_cdns *cdns = bus_to_cdns(bus); 817 818 return cdns_readl(cdns, CDNS_MCP_SLAVE_STAT); 819 } 820 EXPORT_SYMBOL(cdns_read_ping_status); 821 822 /* 823 * IRQ handling 824 */ 825 826 static int cdns_update_slave_status(struct sdw_cdns *cdns, 827 u64 slave_intstat) 828 { 829 enum sdw_slave_status status[SDW_MAX_DEVICES + 1]; 830 bool is_slave = false; 831 u32 mask; 832 u32 val; 833 int i, set_status; 834 835 memset(status, 0, sizeof(status)); 836 837 for (i = 0; i <= SDW_MAX_DEVICES; i++) { 838 mask = (slave_intstat >> (i * CDNS_MCP_SLAVE_STATUS_NUM)) & 839 CDNS_MCP_SLAVE_STATUS_BITS; 840 841 set_status = 0; 842 843 if (mask) { 844 is_slave = true; 845 846 if (mask & CDNS_MCP_SLAVE_INTSTAT_RESERVED) { 847 status[i] = SDW_SLAVE_RESERVED; 848 set_status++; 849 } 850 851 if (mask & CDNS_MCP_SLAVE_INTSTAT_ATTACHED) { 852 status[i] = SDW_SLAVE_ATTACHED; 853 set_status++; 854 } 855 856 if (mask & CDNS_MCP_SLAVE_INTSTAT_ALERT) { 857 status[i] = SDW_SLAVE_ALERT; 858 set_status++; 859 } 860 861 if (mask & CDNS_MCP_SLAVE_INTSTAT_NPRESENT) { 862 status[i] = SDW_SLAVE_UNATTACHED; 863 set_status++; 864 } 865 } 866 867 /* 868 * check that there was a single reported Slave status and when 869 * there is not use the latest status extracted from PING commands 870 */ 871 if (set_status != 1) { 872 val = cdns_readl(cdns, CDNS_MCP_SLAVE_STAT); 873 val >>= (i * 2); 874 875 switch (val & 0x3) { 876 case 0: 877 status[i] = SDW_SLAVE_UNATTACHED; 878 break; 879 case 1: 880 status[i] = SDW_SLAVE_ATTACHED; 881 break; 882 case 2: 883 status[i] = SDW_SLAVE_ALERT; 884 break; 885 case 3: 886 default: 887 status[i] = SDW_SLAVE_RESERVED; 888 break; 889 } 890 } 891 } 892 893 if (is_slave) 894 return sdw_handle_slave_status(&cdns->bus, status); 895 896 return 0; 897 } 898 899 /** 900 * sdw_cdns_irq() - Cadence interrupt handler 901 * @irq: irq number 902 * @dev_id: irq context 903 */ 904 irqreturn_t sdw_cdns_irq(int irq, void *dev_id) 905 { 906 struct sdw_cdns *cdns = dev_id; 907 u32 int_status; 908 909 /* Check if the link is up */ 910 if (!cdns->link_up) 911 return IRQ_NONE; 912 913 int_status = cdns_readl(cdns, CDNS_MCP_INTSTAT); 914 915 /* check for reserved values read as zero */ 916 if (int_status & CDNS_MCP_INT_RESERVED) 917 return IRQ_NONE; 918 919 if (!(int_status & CDNS_MCP_INT_IRQ)) 920 return IRQ_NONE; 921 922 if (int_status & CDNS_MCP_INT_RX_WL) { 923 struct sdw_bus *bus = &cdns->bus; 924 struct sdw_defer *defer = &bus->defer_msg; 925 926 cdns_read_response(cdns); 927 928 if (defer && defer->msg) { 929 cdns_fill_msg_resp(cdns, defer->msg, 930 defer->length, 0); 931 complete(&defer->complete); 932 } else { 933 complete(&cdns->tx_complete); 934 } 935 } 936 937 if (int_status & CDNS_MCP_INT_PARITY) { 938 /* Parity error detected by Master */ 939 dev_err_ratelimited(cdns->dev, "Parity error\n"); 940 } 941 942 if (int_status & CDNS_MCP_INT_CTRL_CLASH) { 943 /* Slave is driving bit slot during control word */ 944 dev_err_ratelimited(cdns->dev, "Bus clash for control word\n"); 945 } 946 947 if (int_status & CDNS_MCP_INT_DATA_CLASH) { 948 /* 949 * Multiple slaves trying to drive bit slot, or issue with 950 * ownership of data bits or Slave gone bonkers 951 */ 952 dev_err_ratelimited(cdns->dev, "Bus clash for data word\n"); 953 } 954 955 if (cdns->bus.params.m_data_mode != SDW_PORT_DATA_MODE_NORMAL && 956 int_status & CDNS_MCP_INT_DPINT) { 957 u32 port_intstat; 958 959 /* just log which ports report an error */ 960 port_intstat = cdns_readl(cdns, CDNS_MCP_PORT_INTSTAT); 961 dev_err_ratelimited(cdns->dev, "DP interrupt: PortIntStat %8x\n", 962 port_intstat); 963 964 /* clear status w/ write1 */ 965 cdns_writel(cdns, CDNS_MCP_PORT_INTSTAT, port_intstat); 966 } 967 968 if (int_status & CDNS_MCP_INT_SLAVE_MASK) { 969 /* Mask the Slave interrupt and wake thread */ 970 cdns_updatel(cdns, CDNS_MCP_INTMASK, 971 CDNS_MCP_INT_SLAVE_MASK, 0); 972 973 int_status &= ~CDNS_MCP_INT_SLAVE_MASK; 974 975 /* 976 * Deal with possible race condition between interrupt 977 * handling and disabling interrupts on suspend. 978 * 979 * If the master is in the process of disabling 980 * interrupts, don't schedule a workqueue 981 */ 982 if (cdns->interrupt_enabled) 983 schedule_work(&cdns->work); 984 } 985 986 cdns_writel(cdns, CDNS_MCP_INTSTAT, int_status); 987 return IRQ_HANDLED; 988 } 989 EXPORT_SYMBOL(sdw_cdns_irq); 990 991 /** 992 * cdns_update_slave_status_work - update slave status in a work since we will need to handle 993 * other interrupts eg. CDNS_MCP_INT_RX_WL during the update slave 994 * process. 995 * @work: cdns worker thread 996 */ 997 static void cdns_update_slave_status_work(struct work_struct *work) 998 { 999 struct sdw_cdns *cdns = 1000 container_of(work, struct sdw_cdns, work); 1001 u32 slave0, slave1; 1002 u64 slave_intstat; 1003 u32 device0_status; 1004 int retry_count = 0; 1005 1006 /* 1007 * Clear main interrupt first so we don't lose any assertions 1008 * that happen during this function. 1009 */ 1010 cdns_writel(cdns, CDNS_MCP_INTSTAT, CDNS_MCP_INT_SLAVE_MASK); 1011 1012 slave0 = cdns_readl(cdns, CDNS_MCP_SLAVE_INTSTAT0); 1013 slave1 = cdns_readl(cdns, CDNS_MCP_SLAVE_INTSTAT1); 1014 1015 /* 1016 * Clear the bits before handling so we don't lose any 1017 * bits that re-assert. 1018 */ 1019 cdns_writel(cdns, CDNS_MCP_SLAVE_INTSTAT0, slave0); 1020 cdns_writel(cdns, CDNS_MCP_SLAVE_INTSTAT1, slave1); 1021 1022 /* combine the two status */ 1023 slave_intstat = ((u64)slave1 << 32) | slave0; 1024 1025 dev_dbg_ratelimited(cdns->dev, "Slave status change: 0x%llx\n", slave_intstat); 1026 1027 update_status: 1028 cdns_update_slave_status(cdns, slave_intstat); 1029 1030 /* 1031 * When there is more than one peripheral per link, it's 1032 * possible that a deviceB becomes attached after we deal with 1033 * the attachment of deviceA. Since the hardware does a 1034 * logical AND, the attachment of the second device does not 1035 * change the status seen by the driver. 1036 * 1037 * In that case, clearing the registers above would result in 1038 * the deviceB never being detected - until a change of status 1039 * is observed on the bus. 1040 * 1041 * To avoid this race condition, re-check if any device0 needs 1042 * attention with PING commands. There is no need to check for 1043 * ALERTS since they are not allowed until a non-zero 1044 * device_number is assigned. 1045 * 1046 * Do not clear the INTSTAT0/1. While looping to enumerate devices on 1047 * #0 there could be status changes on other devices - these must 1048 * be kept in the INTSTAT so they can be handled when all #0 devices 1049 * have been handled. 1050 */ 1051 1052 device0_status = cdns_readl(cdns, CDNS_MCP_SLAVE_STAT); 1053 device0_status &= 3; 1054 1055 if (device0_status == SDW_SLAVE_ATTACHED) { 1056 if (retry_count++ < SDW_MAX_DEVICES) { 1057 dev_dbg_ratelimited(cdns->dev, 1058 "Device0 detected after clearing status, iteration %d\n", 1059 retry_count); 1060 slave_intstat = CDNS_MCP_SLAVE_INTSTAT_ATTACHED; 1061 goto update_status; 1062 } else { 1063 dev_err_ratelimited(cdns->dev, 1064 "Device0 detected after %d iterations\n", 1065 retry_count); 1066 } 1067 } 1068 1069 /* unmask Slave interrupt now */ 1070 cdns_updatel(cdns, CDNS_MCP_INTMASK, 1071 CDNS_MCP_INT_SLAVE_MASK, CDNS_MCP_INT_SLAVE_MASK); 1072 1073 } 1074 1075 /* paranoia check to make sure self-cleared bits are indeed cleared */ 1076 void sdw_cdns_check_self_clearing_bits(struct sdw_cdns *cdns, const char *string, 1077 bool initial_delay, int reset_iterations) 1078 { 1079 u32 ip_mcp_control; 1080 u32 mcp_control; 1081 u32 mcp_config_update; 1082 int i; 1083 1084 if (initial_delay) 1085 usleep_range(1000, 1500); 1086 1087 ip_mcp_control = cdns_ip_readl(cdns, CDNS_IP_MCP_CONTROL); 1088 1089 /* the following bits should be cleared immediately */ 1090 if (ip_mcp_control & CDNS_IP_MCP_CONTROL_SW_RST) 1091 dev_err(cdns->dev, "%s failed: IP_MCP_CONTROL_SW_RST is not cleared\n", string); 1092 1093 mcp_control = cdns_readl(cdns, CDNS_MCP_CONTROL); 1094 1095 /* the following bits should be cleared immediately */ 1096 if (mcp_control & CDNS_MCP_CONTROL_CMD_RST) 1097 dev_err(cdns->dev, "%s failed: MCP_CONTROL_CMD_RST is not cleared\n", string); 1098 if (mcp_control & CDNS_MCP_CONTROL_SOFT_RST) 1099 dev_err(cdns->dev, "%s failed: MCP_CONTROL_SOFT_RST is not cleared\n", string); 1100 if (mcp_control & CDNS_MCP_CONTROL_CLK_STOP_CLR) 1101 dev_err(cdns->dev, "%s failed: MCP_CONTROL_CLK_STOP_CLR is not cleared\n", string); 1102 1103 mcp_config_update = cdns_readl(cdns, CDNS_MCP_CONFIG_UPDATE); 1104 if (mcp_config_update & CDNS_MCP_CONFIG_UPDATE_BIT) 1105 dev_err(cdns->dev, "%s failed: MCP_CONFIG_UPDATE_BIT is not cleared\n", string); 1106 1107 i = 0; 1108 while (mcp_control & CDNS_MCP_CONTROL_HW_RST) { 1109 if (i == reset_iterations) { 1110 dev_err(cdns->dev, "%s failed: MCP_CONTROL_HW_RST is not cleared\n", string); 1111 break; 1112 } 1113 1114 dev_dbg(cdns->dev, "%s: MCP_CONTROL_HW_RST is not cleared at iteration %d\n", string, i); 1115 i++; 1116 1117 usleep_range(1000, 1500); 1118 mcp_control = cdns_readl(cdns, CDNS_MCP_CONTROL); 1119 } 1120 1121 } 1122 EXPORT_SYMBOL(sdw_cdns_check_self_clearing_bits); 1123 1124 /* 1125 * init routines 1126 */ 1127 1128 /** 1129 * sdw_cdns_exit_reset() - Program reset parameters and start bus operations 1130 * @cdns: Cadence instance 1131 */ 1132 int sdw_cdns_exit_reset(struct sdw_cdns *cdns) 1133 { 1134 /* keep reset delay unchanged to 4096 cycles */ 1135 1136 /* use hardware generated reset */ 1137 cdns_updatel(cdns, CDNS_MCP_CONTROL, 1138 CDNS_MCP_CONTROL_HW_RST, 1139 CDNS_MCP_CONTROL_HW_RST); 1140 1141 /* commit changes */ 1142 return cdns_config_update(cdns); 1143 } 1144 EXPORT_SYMBOL(sdw_cdns_exit_reset); 1145 1146 /** 1147 * cdns_enable_slave_interrupts() - Enable SDW slave interrupts 1148 * @cdns: Cadence instance 1149 * @state: boolean for true/false 1150 */ 1151 static void cdns_enable_slave_interrupts(struct sdw_cdns *cdns, bool state) 1152 { 1153 u32 mask; 1154 1155 mask = cdns_readl(cdns, CDNS_MCP_INTMASK); 1156 if (state) 1157 mask |= CDNS_MCP_INT_SLAVE_MASK; 1158 else 1159 mask &= ~CDNS_MCP_INT_SLAVE_MASK; 1160 1161 cdns_writel(cdns, CDNS_MCP_INTMASK, mask); 1162 } 1163 1164 /** 1165 * sdw_cdns_enable_interrupt() - Enable SDW interrupts 1166 * @cdns: Cadence instance 1167 * @state: True if we are trying to enable interrupt. 1168 */ 1169 int sdw_cdns_enable_interrupt(struct sdw_cdns *cdns, bool state) 1170 { 1171 u32 slave_intmask0 = 0; 1172 u32 slave_intmask1 = 0; 1173 u32 mask = 0; 1174 1175 if (!state) 1176 goto update_masks; 1177 1178 slave_intmask0 = CDNS_MCP_SLAVE_INTMASK0_MASK; 1179 slave_intmask1 = CDNS_MCP_SLAVE_INTMASK1_MASK; 1180 1181 /* enable detection of all slave state changes */ 1182 mask = CDNS_MCP_INT_SLAVE_MASK; 1183 1184 /* enable detection of bus issues */ 1185 mask |= CDNS_MCP_INT_CTRL_CLASH | CDNS_MCP_INT_DATA_CLASH | 1186 CDNS_MCP_INT_PARITY; 1187 1188 /* port interrupt limited to test modes for now */ 1189 if (cdns->bus.params.m_data_mode != SDW_PORT_DATA_MODE_NORMAL) 1190 mask |= CDNS_MCP_INT_DPINT; 1191 1192 /* enable detection of RX fifo level */ 1193 mask |= CDNS_MCP_INT_RX_WL; 1194 1195 /* 1196 * CDNS_MCP_INT_IRQ needs to be set otherwise all previous 1197 * settings are irrelevant 1198 */ 1199 mask |= CDNS_MCP_INT_IRQ; 1200 1201 if (interrupt_mask) /* parameter override */ 1202 mask = interrupt_mask; 1203 1204 update_masks: 1205 /* clear slave interrupt status before enabling interrupt */ 1206 if (state) { 1207 u32 slave_state; 1208 1209 slave_state = cdns_readl(cdns, CDNS_MCP_SLAVE_INTSTAT0); 1210 cdns_writel(cdns, CDNS_MCP_SLAVE_INTSTAT0, slave_state); 1211 slave_state = cdns_readl(cdns, CDNS_MCP_SLAVE_INTSTAT1); 1212 cdns_writel(cdns, CDNS_MCP_SLAVE_INTSTAT1, slave_state); 1213 } 1214 cdns->interrupt_enabled = state; 1215 1216 /* 1217 * Complete any on-going status updates before updating masks, 1218 * and cancel queued status updates. 1219 * 1220 * There could be a race with a new interrupt thrown before 1221 * the 3 mask updates below are complete, so in the interrupt 1222 * we use the 'interrupt_enabled' status to prevent new work 1223 * from being queued. 1224 */ 1225 if (!state) 1226 cancel_work_sync(&cdns->work); 1227 1228 cdns_writel(cdns, CDNS_MCP_SLAVE_INTMASK0, slave_intmask0); 1229 cdns_writel(cdns, CDNS_MCP_SLAVE_INTMASK1, slave_intmask1); 1230 cdns_writel(cdns, CDNS_MCP_INTMASK, mask); 1231 1232 return 0; 1233 } 1234 EXPORT_SYMBOL(sdw_cdns_enable_interrupt); 1235 1236 static int cdns_allocate_pdi(struct sdw_cdns *cdns, 1237 struct sdw_cdns_pdi **stream, 1238 u32 num, u32 pdi_offset) 1239 { 1240 struct sdw_cdns_pdi *pdi; 1241 int i; 1242 1243 if (!num) 1244 return 0; 1245 1246 pdi = devm_kcalloc(cdns->dev, num, sizeof(*pdi), GFP_KERNEL); 1247 if (!pdi) 1248 return -ENOMEM; 1249 1250 for (i = 0; i < num; i++) { 1251 pdi[i].num = i + pdi_offset; 1252 } 1253 1254 *stream = pdi; 1255 return 0; 1256 } 1257 1258 /** 1259 * sdw_cdns_pdi_init() - PDI initialization routine 1260 * 1261 * @cdns: Cadence instance 1262 * @config: Stream configurations 1263 */ 1264 int sdw_cdns_pdi_init(struct sdw_cdns *cdns, 1265 struct sdw_cdns_stream_config config) 1266 { 1267 struct sdw_cdns_streams *stream; 1268 int offset; 1269 int ret; 1270 1271 cdns->pcm.num_bd = config.pcm_bd; 1272 cdns->pcm.num_in = config.pcm_in; 1273 cdns->pcm.num_out = config.pcm_out; 1274 1275 /* Allocate PDIs for PCMs */ 1276 stream = &cdns->pcm; 1277 1278 /* we allocate PDI0 and PDI1 which are used for Bulk */ 1279 offset = 0; 1280 1281 ret = cdns_allocate_pdi(cdns, &stream->bd, 1282 stream->num_bd, offset); 1283 if (ret) 1284 return ret; 1285 1286 offset += stream->num_bd; 1287 1288 ret = cdns_allocate_pdi(cdns, &stream->in, 1289 stream->num_in, offset); 1290 if (ret) 1291 return ret; 1292 1293 offset += stream->num_in; 1294 1295 ret = cdns_allocate_pdi(cdns, &stream->out, 1296 stream->num_out, offset); 1297 if (ret) 1298 return ret; 1299 1300 /* Update total number of PCM PDIs */ 1301 stream->num_pdi = stream->num_bd + stream->num_in + stream->num_out; 1302 cdns->num_ports = stream->num_pdi; 1303 1304 return 0; 1305 } 1306 EXPORT_SYMBOL(sdw_cdns_pdi_init); 1307 1308 static u32 cdns_set_initial_frame_shape(int n_rows, int n_cols) 1309 { 1310 u32 val; 1311 int c; 1312 int r; 1313 1314 r = sdw_find_row_index(n_rows); 1315 c = sdw_find_col_index(n_cols); 1316 1317 val = FIELD_PREP(CDNS_MCP_FRAME_SHAPE_ROW_MASK, r); 1318 val |= FIELD_PREP(CDNS_MCP_FRAME_SHAPE_COL_MASK, c); 1319 1320 return val; 1321 } 1322 1323 static void cdns_init_clock_ctrl(struct sdw_cdns *cdns) 1324 { 1325 struct sdw_bus *bus = &cdns->bus; 1326 struct sdw_master_prop *prop = &bus->prop; 1327 u32 val; 1328 u32 ssp_interval; 1329 int divider; 1330 1331 /* Set clock divider */ 1332 divider = (prop->mclk_freq / prop->max_clk_freq) - 1; 1333 1334 cdns_updatel(cdns, CDNS_MCP_CLK_CTRL0, 1335 CDNS_MCP_CLK_MCLKD_MASK, divider); 1336 cdns_updatel(cdns, CDNS_MCP_CLK_CTRL1, 1337 CDNS_MCP_CLK_MCLKD_MASK, divider); 1338 1339 /* 1340 * Frame shape changes after initialization have to be done 1341 * with the bank switch mechanism 1342 */ 1343 val = cdns_set_initial_frame_shape(prop->default_row, 1344 prop->default_col); 1345 cdns_writel(cdns, CDNS_MCP_FRAME_SHAPE_INIT, val); 1346 1347 /* Set SSP interval to default value */ 1348 ssp_interval = prop->default_frame_rate / SDW_CADENCE_GSYNC_HZ; 1349 cdns_writel(cdns, CDNS_MCP_SSP_CTRL0, ssp_interval); 1350 cdns_writel(cdns, CDNS_MCP_SSP_CTRL1, ssp_interval); 1351 } 1352 1353 /** 1354 * sdw_cdns_init() - Cadence initialization 1355 * @cdns: Cadence instance 1356 */ 1357 int sdw_cdns_init(struct sdw_cdns *cdns) 1358 { 1359 u32 val; 1360 1361 cdns_init_clock_ctrl(cdns); 1362 1363 sdw_cdns_check_self_clearing_bits(cdns, __func__, false, 0); 1364 1365 /* reset msg_count to default value of FIFOLEVEL */ 1366 cdns->msg_count = cdns_readl(cdns, CDNS_MCP_FIFOLEVEL); 1367 1368 /* flush command FIFOs */ 1369 cdns_updatel(cdns, CDNS_MCP_CONTROL, CDNS_MCP_CONTROL_CMD_RST, 1370 CDNS_MCP_CONTROL_CMD_RST); 1371 1372 /* Set cmd accept mode */ 1373 cdns_ip_updatel(cdns, CDNS_IP_MCP_CONTROL, CDNS_IP_MCP_CONTROL_CMD_ACCEPT, 1374 CDNS_IP_MCP_CONTROL_CMD_ACCEPT); 1375 1376 /* Configure mcp config */ 1377 val = cdns_readl(cdns, CDNS_MCP_CONFIG); 1378 1379 /* Disable auto bus release */ 1380 val &= ~CDNS_MCP_CONFIG_BUS_REL; 1381 1382 cdns_writel(cdns, CDNS_MCP_CONFIG, val); 1383 1384 /* Configure IP mcp config */ 1385 val = cdns_ip_readl(cdns, CDNS_IP_MCP_CONFIG); 1386 1387 /* enable bus operations with clock and data */ 1388 val &= ~CDNS_IP_MCP_CONFIG_OP; 1389 val |= CDNS_IP_MCP_CONFIG_OP_NORMAL; 1390 1391 /* Set cmd mode for Tx and Rx cmds */ 1392 val &= ~CDNS_IP_MCP_CONFIG_CMD; 1393 1394 /* Disable sniffer mode */ 1395 val &= ~CDNS_IP_MCP_CONFIG_SNIFFER; 1396 1397 if (cdns->bus.multi_link) 1398 /* Set Multi-master mode to take gsync into account */ 1399 val |= CDNS_IP_MCP_CONFIG_MMASTER; 1400 1401 /* leave frame delay to hardware default of 0x1F */ 1402 1403 /* leave command retry to hardware default of 0 */ 1404 1405 cdns_ip_writel(cdns, CDNS_IP_MCP_CONFIG, val); 1406 1407 /* changes will be committed later */ 1408 return 0; 1409 } 1410 EXPORT_SYMBOL(sdw_cdns_init); 1411 1412 int cdns_bus_conf(struct sdw_bus *bus, struct sdw_bus_params *params) 1413 { 1414 struct sdw_master_prop *prop = &bus->prop; 1415 struct sdw_cdns *cdns = bus_to_cdns(bus); 1416 int mcp_clkctrl_off; 1417 int divider; 1418 1419 if (!params->curr_dr_freq) { 1420 dev_err(cdns->dev, "NULL curr_dr_freq\n"); 1421 return -EINVAL; 1422 } 1423 1424 divider = prop->mclk_freq * SDW_DOUBLE_RATE_FACTOR / 1425 params->curr_dr_freq; 1426 divider--; /* divider is 1/(N+1) */ 1427 1428 if (params->next_bank) 1429 mcp_clkctrl_off = CDNS_MCP_CLK_CTRL1; 1430 else 1431 mcp_clkctrl_off = CDNS_MCP_CLK_CTRL0; 1432 1433 cdns_updatel(cdns, mcp_clkctrl_off, CDNS_MCP_CLK_MCLKD_MASK, divider); 1434 1435 return 0; 1436 } 1437 EXPORT_SYMBOL(cdns_bus_conf); 1438 1439 static int cdns_port_params(struct sdw_bus *bus, 1440 struct sdw_port_params *p_params, unsigned int bank) 1441 { 1442 struct sdw_cdns *cdns = bus_to_cdns(bus); 1443 int dpn_config_off_source; 1444 int dpn_config_off_target; 1445 int target_num = p_params->num; 1446 int source_num = p_params->num; 1447 bool override = false; 1448 int dpn_config; 1449 1450 if (target_num == cdns->pdi_loopback_target && 1451 cdns->pdi_loopback_source != -1) { 1452 source_num = cdns->pdi_loopback_source; 1453 override = true; 1454 } 1455 1456 if (bank) { 1457 dpn_config_off_source = CDNS_DPN_B1_CONFIG(source_num); 1458 dpn_config_off_target = CDNS_DPN_B1_CONFIG(target_num); 1459 } else { 1460 dpn_config_off_source = CDNS_DPN_B0_CONFIG(source_num); 1461 dpn_config_off_target = CDNS_DPN_B0_CONFIG(target_num); 1462 } 1463 1464 dpn_config = cdns_readl(cdns, dpn_config_off_source); 1465 1466 /* use port params if there is no loopback, otherwise use source as is */ 1467 if (!override) { 1468 u32p_replace_bits(&dpn_config, p_params->bps - 1, CDNS_DPN_CONFIG_WL); 1469 u32p_replace_bits(&dpn_config, p_params->flow_mode, CDNS_DPN_CONFIG_PORT_FLOW); 1470 u32p_replace_bits(&dpn_config, p_params->data_mode, CDNS_DPN_CONFIG_PORT_DAT); 1471 } 1472 1473 cdns_writel(cdns, dpn_config_off_target, dpn_config); 1474 1475 return 0; 1476 } 1477 1478 static int cdns_transport_params(struct sdw_bus *bus, 1479 struct sdw_transport_params *t_params, 1480 enum sdw_reg_bank bank) 1481 { 1482 struct sdw_cdns *cdns = bus_to_cdns(bus); 1483 int dpn_config; 1484 int dpn_config_off_source; 1485 int dpn_config_off_target; 1486 int dpn_hctrl; 1487 int dpn_hctrl_off_source; 1488 int dpn_hctrl_off_target; 1489 int dpn_offsetctrl; 1490 int dpn_offsetctrl_off_source; 1491 int dpn_offsetctrl_off_target; 1492 int dpn_samplectrl; 1493 int dpn_samplectrl_off_source; 1494 int dpn_samplectrl_off_target; 1495 int source_num = t_params->port_num; 1496 int target_num = t_params->port_num; 1497 bool override = false; 1498 1499 if (target_num == cdns->pdi_loopback_target && 1500 cdns->pdi_loopback_source != -1) { 1501 source_num = cdns->pdi_loopback_source; 1502 override = true; 1503 } 1504 1505 /* 1506 * Note: Only full data port is supported on the Master side for 1507 * both PCM and PDM ports. 1508 */ 1509 1510 if (bank) { 1511 dpn_config_off_source = CDNS_DPN_B1_CONFIG(source_num); 1512 dpn_hctrl_off_source = CDNS_DPN_B1_HCTRL(source_num); 1513 dpn_offsetctrl_off_source = CDNS_DPN_B1_OFFSET_CTRL(source_num); 1514 dpn_samplectrl_off_source = CDNS_DPN_B1_SAMPLE_CTRL(source_num); 1515 1516 dpn_config_off_target = CDNS_DPN_B1_CONFIG(target_num); 1517 dpn_hctrl_off_target = CDNS_DPN_B1_HCTRL(target_num); 1518 dpn_offsetctrl_off_target = CDNS_DPN_B1_OFFSET_CTRL(target_num); 1519 dpn_samplectrl_off_target = CDNS_DPN_B1_SAMPLE_CTRL(target_num); 1520 1521 } else { 1522 dpn_config_off_source = CDNS_DPN_B0_CONFIG(source_num); 1523 dpn_hctrl_off_source = CDNS_DPN_B0_HCTRL(source_num); 1524 dpn_offsetctrl_off_source = CDNS_DPN_B0_OFFSET_CTRL(source_num); 1525 dpn_samplectrl_off_source = CDNS_DPN_B0_SAMPLE_CTRL(source_num); 1526 1527 dpn_config_off_target = CDNS_DPN_B0_CONFIG(target_num); 1528 dpn_hctrl_off_target = CDNS_DPN_B0_HCTRL(target_num); 1529 dpn_offsetctrl_off_target = CDNS_DPN_B0_OFFSET_CTRL(target_num); 1530 dpn_samplectrl_off_target = CDNS_DPN_B0_SAMPLE_CTRL(target_num); 1531 } 1532 1533 dpn_config = cdns_readl(cdns, dpn_config_off_source); 1534 if (!override) { 1535 u32p_replace_bits(&dpn_config, t_params->blk_grp_ctrl, CDNS_DPN_CONFIG_BGC); 1536 u32p_replace_bits(&dpn_config, t_params->blk_pkg_mode, CDNS_DPN_CONFIG_BPM); 1537 } 1538 cdns_writel(cdns, dpn_config_off_target, dpn_config); 1539 1540 if (!override) { 1541 dpn_offsetctrl = 0; 1542 u32p_replace_bits(&dpn_offsetctrl, t_params->offset1, CDNS_DPN_OFFSET_CTRL_1); 1543 u32p_replace_bits(&dpn_offsetctrl, t_params->offset2, CDNS_DPN_OFFSET_CTRL_2); 1544 } else { 1545 dpn_offsetctrl = cdns_readl(cdns, dpn_offsetctrl_off_source); 1546 } 1547 cdns_writel(cdns, dpn_offsetctrl_off_target, dpn_offsetctrl); 1548 1549 if (!override) { 1550 dpn_hctrl = 0; 1551 u32p_replace_bits(&dpn_hctrl, t_params->hstart, CDNS_DPN_HCTRL_HSTART); 1552 u32p_replace_bits(&dpn_hctrl, t_params->hstop, CDNS_DPN_HCTRL_HSTOP); 1553 u32p_replace_bits(&dpn_hctrl, t_params->lane_ctrl, CDNS_DPN_HCTRL_LCTRL); 1554 } else { 1555 dpn_hctrl = cdns_readl(cdns, dpn_hctrl_off_source); 1556 } 1557 cdns_writel(cdns, dpn_hctrl_off_target, dpn_hctrl); 1558 1559 if (!override) 1560 dpn_samplectrl = t_params->sample_interval - 1; 1561 else 1562 dpn_samplectrl = cdns_readl(cdns, dpn_samplectrl_off_source); 1563 cdns_writel(cdns, dpn_samplectrl_off_target, dpn_samplectrl); 1564 1565 return 0; 1566 } 1567 1568 static int cdns_port_enable(struct sdw_bus *bus, 1569 struct sdw_enable_ch *enable_ch, unsigned int bank) 1570 { 1571 struct sdw_cdns *cdns = bus_to_cdns(bus); 1572 int dpn_chnen_off, ch_mask; 1573 1574 if (bank) 1575 dpn_chnen_off = CDNS_DPN_B1_CH_EN(enable_ch->port_num); 1576 else 1577 dpn_chnen_off = CDNS_DPN_B0_CH_EN(enable_ch->port_num); 1578 1579 ch_mask = enable_ch->ch_mask * enable_ch->enable; 1580 cdns_writel(cdns, dpn_chnen_off, ch_mask); 1581 1582 return 0; 1583 } 1584 1585 static const struct sdw_master_port_ops cdns_port_ops = { 1586 .dpn_set_port_params = cdns_port_params, 1587 .dpn_set_port_transport_params = cdns_transport_params, 1588 .dpn_port_enable_ch = cdns_port_enable, 1589 }; 1590 1591 /** 1592 * sdw_cdns_is_clock_stop: Check clock status 1593 * 1594 * @cdns: Cadence instance 1595 */ 1596 bool sdw_cdns_is_clock_stop(struct sdw_cdns *cdns) 1597 { 1598 return !!(cdns_readl(cdns, CDNS_MCP_STAT) & CDNS_MCP_STAT_CLK_STOP); 1599 } 1600 EXPORT_SYMBOL(sdw_cdns_is_clock_stop); 1601 1602 /** 1603 * sdw_cdns_clock_stop: Cadence clock stop configuration routine 1604 * 1605 * @cdns: Cadence instance 1606 * @block_wake: prevent wakes if required by the platform 1607 */ 1608 int sdw_cdns_clock_stop(struct sdw_cdns *cdns, bool block_wake) 1609 { 1610 bool slave_present = false; 1611 struct sdw_slave *slave; 1612 int ret; 1613 1614 sdw_cdns_check_self_clearing_bits(cdns, __func__, false, 0); 1615 1616 /* Check suspend status */ 1617 if (sdw_cdns_is_clock_stop(cdns)) { 1618 dev_dbg(cdns->dev, "Clock is already stopped\n"); 1619 return 0; 1620 } 1621 1622 /* 1623 * Before entering clock stop we mask the Slave 1624 * interrupts. This helps avoid having to deal with e.g. a 1625 * Slave becoming UNATTACHED while the clock is being stopped 1626 */ 1627 cdns_enable_slave_interrupts(cdns, false); 1628 1629 /* 1630 * For specific platforms, it is required to be able to put 1631 * master into a state in which it ignores wake-up trials 1632 * in clock stop state 1633 */ 1634 if (block_wake) 1635 cdns_ip_updatel(cdns, CDNS_IP_MCP_CONTROL, 1636 CDNS_IP_MCP_CONTROL_BLOCK_WAKEUP, 1637 CDNS_IP_MCP_CONTROL_BLOCK_WAKEUP); 1638 1639 list_for_each_entry(slave, &cdns->bus.slaves, node) { 1640 if (slave->status == SDW_SLAVE_ATTACHED || 1641 slave->status == SDW_SLAVE_ALERT) { 1642 slave_present = true; 1643 break; 1644 } 1645 } 1646 1647 /* commit changes */ 1648 ret = cdns_config_update(cdns); 1649 if (ret < 0) { 1650 dev_err(cdns->dev, "%s: config_update failed\n", __func__); 1651 return ret; 1652 } 1653 1654 /* Prepare slaves for clock stop */ 1655 if (slave_present) { 1656 ret = sdw_bus_prep_clk_stop(&cdns->bus); 1657 if (ret < 0 && ret != -ENODATA) { 1658 dev_err(cdns->dev, "prepare clock stop failed %d\n", ret); 1659 return ret; 1660 } 1661 } 1662 1663 /* 1664 * Enter clock stop mode and only report errors if there are 1665 * Slave devices present (ALERT or ATTACHED) 1666 */ 1667 ret = sdw_bus_clk_stop(&cdns->bus); 1668 if (ret < 0 && slave_present && ret != -ENODATA) { 1669 dev_err(cdns->dev, "bus clock stop failed %d\n", ret); 1670 return ret; 1671 } 1672 1673 ret = cdns_set_wait(cdns, CDNS_MCP_STAT, 1674 CDNS_MCP_STAT_CLK_STOP, 1675 CDNS_MCP_STAT_CLK_STOP); 1676 if (ret < 0) 1677 dev_err(cdns->dev, "Clock stop failed %d\n", ret); 1678 1679 return ret; 1680 } 1681 EXPORT_SYMBOL(sdw_cdns_clock_stop); 1682 1683 /** 1684 * sdw_cdns_clock_restart: Cadence PM clock restart configuration routine 1685 * 1686 * @cdns: Cadence instance 1687 * @bus_reset: context may be lost while in low power modes and the bus 1688 * may require a Severe Reset and re-enumeration after a wake. 1689 */ 1690 int sdw_cdns_clock_restart(struct sdw_cdns *cdns, bool bus_reset) 1691 { 1692 int ret; 1693 1694 /* unmask Slave interrupts that were masked when stopping the clock */ 1695 cdns_enable_slave_interrupts(cdns, true); 1696 1697 ret = cdns_clear_bit(cdns, CDNS_MCP_CONTROL, 1698 CDNS_MCP_CONTROL_CLK_STOP_CLR); 1699 if (ret < 0) { 1700 dev_err(cdns->dev, "Couldn't exit from clock stop\n"); 1701 return ret; 1702 } 1703 1704 ret = cdns_set_wait(cdns, CDNS_MCP_STAT, CDNS_MCP_STAT_CLK_STOP, 0); 1705 if (ret < 0) { 1706 dev_err(cdns->dev, "clock stop exit failed %d\n", ret); 1707 return ret; 1708 } 1709 1710 cdns_ip_updatel(cdns, CDNS_IP_MCP_CONTROL, 1711 CDNS_IP_MCP_CONTROL_BLOCK_WAKEUP, 0); 1712 1713 cdns_ip_updatel(cdns, CDNS_IP_MCP_CONTROL, CDNS_IP_MCP_CONTROL_CMD_ACCEPT, 1714 CDNS_IP_MCP_CONTROL_CMD_ACCEPT); 1715 1716 if (!bus_reset) { 1717 1718 /* enable bus operations with clock and data */ 1719 cdns_ip_updatel(cdns, CDNS_IP_MCP_CONFIG, 1720 CDNS_IP_MCP_CONFIG_OP, 1721 CDNS_IP_MCP_CONFIG_OP_NORMAL); 1722 1723 ret = cdns_config_update(cdns); 1724 if (ret < 0) { 1725 dev_err(cdns->dev, "%s: config_update failed\n", __func__); 1726 return ret; 1727 } 1728 1729 ret = sdw_bus_exit_clk_stop(&cdns->bus); 1730 if (ret < 0) 1731 dev_err(cdns->dev, "bus failed to exit clock stop %d\n", ret); 1732 } 1733 1734 return ret; 1735 } 1736 EXPORT_SYMBOL(sdw_cdns_clock_restart); 1737 1738 /** 1739 * sdw_cdns_probe() - Cadence probe routine 1740 * @cdns: Cadence instance 1741 */ 1742 int sdw_cdns_probe(struct sdw_cdns *cdns) 1743 { 1744 init_completion(&cdns->tx_complete); 1745 cdns->bus.port_ops = &cdns_port_ops; 1746 1747 INIT_WORK(&cdns->work, cdns_update_slave_status_work); 1748 return 0; 1749 } 1750 EXPORT_SYMBOL(sdw_cdns_probe); 1751 1752 int cdns_set_sdw_stream(struct snd_soc_dai *dai, 1753 void *stream, int direction) 1754 { 1755 struct sdw_cdns *cdns = snd_soc_dai_get_drvdata(dai); 1756 struct sdw_cdns_dai_runtime *dai_runtime; 1757 1758 dai_runtime = cdns->dai_runtime_array[dai->id]; 1759 1760 if (stream) { 1761 /* first paranoia check */ 1762 if (dai_runtime) { 1763 dev_err(dai->dev, 1764 "dai_runtime already allocated for dai %s\n", 1765 dai->name); 1766 return -EINVAL; 1767 } 1768 1769 /* allocate and set dai_runtime info */ 1770 dai_runtime = kzalloc(sizeof(*dai_runtime), GFP_KERNEL); 1771 if (!dai_runtime) 1772 return -ENOMEM; 1773 1774 dai_runtime->stream_type = SDW_STREAM_PCM; 1775 1776 dai_runtime->bus = &cdns->bus; 1777 dai_runtime->link_id = cdns->instance; 1778 1779 dai_runtime->stream = stream; 1780 dai_runtime->direction = direction; 1781 1782 cdns->dai_runtime_array[dai->id] = dai_runtime; 1783 } else { 1784 /* second paranoia check */ 1785 if (!dai_runtime) { 1786 dev_err(dai->dev, 1787 "dai_runtime not allocated for dai %s\n", 1788 dai->name); 1789 return -EINVAL; 1790 } 1791 1792 /* for NULL stream we release allocated dai_runtime */ 1793 kfree(dai_runtime); 1794 cdns->dai_runtime_array[dai->id] = NULL; 1795 } 1796 return 0; 1797 } 1798 EXPORT_SYMBOL(cdns_set_sdw_stream); 1799 1800 /** 1801 * cdns_find_pdi() - Find a free PDI 1802 * 1803 * @cdns: Cadence instance 1804 * @offset: Starting offset 1805 * @num: Number of PDIs 1806 * @pdi: PDI instances 1807 * @dai_id: DAI id 1808 * 1809 * Find a PDI for a given PDI array. The PDI num and dai_id are 1810 * expected to match, return NULL otherwise. 1811 */ 1812 static struct sdw_cdns_pdi *cdns_find_pdi(struct sdw_cdns *cdns, 1813 unsigned int offset, 1814 unsigned int num, 1815 struct sdw_cdns_pdi *pdi, 1816 int dai_id) 1817 { 1818 int i; 1819 1820 for (i = offset; i < offset + num; i++) 1821 if (pdi[i].num == dai_id) 1822 return &pdi[i]; 1823 1824 return NULL; 1825 } 1826 1827 /** 1828 * sdw_cdns_config_stream: Configure a stream 1829 * 1830 * @cdns: Cadence instance 1831 * @ch: Channel count 1832 * @dir: Data direction 1833 * @pdi: PDI to be used 1834 */ 1835 void sdw_cdns_config_stream(struct sdw_cdns *cdns, 1836 u32 ch, u32 dir, struct sdw_cdns_pdi *pdi) 1837 { 1838 u32 offset, val = 0; 1839 1840 if (dir == SDW_DATA_DIR_RX) { 1841 val = CDNS_PORTCTRL_DIRN; 1842 1843 if (cdns->bus.params.m_data_mode != SDW_PORT_DATA_MODE_NORMAL) 1844 val |= CDNS_PORTCTRL_TEST_FAILED; 1845 } 1846 offset = CDNS_PORTCTRL + pdi->num * CDNS_PORT_OFFSET; 1847 cdns_updatel(cdns, offset, 1848 CDNS_PORTCTRL_DIRN | CDNS_PORTCTRL_TEST_FAILED, 1849 val); 1850 1851 val = pdi->num; 1852 val |= CDNS_PDI_CONFIG_SOFT_RESET; 1853 val |= FIELD_PREP(CDNS_PDI_CONFIG_CHANNEL, (1 << ch) - 1); 1854 cdns_writel(cdns, CDNS_PDI_CONFIG(pdi->num), val); 1855 } 1856 EXPORT_SYMBOL(sdw_cdns_config_stream); 1857 1858 /** 1859 * sdw_cdns_alloc_pdi() - Allocate a PDI 1860 * 1861 * @cdns: Cadence instance 1862 * @stream: Stream to be allocated 1863 * @ch: Channel count 1864 * @dir: Data direction 1865 * @dai_id: DAI id 1866 */ 1867 struct sdw_cdns_pdi *sdw_cdns_alloc_pdi(struct sdw_cdns *cdns, 1868 struct sdw_cdns_streams *stream, 1869 u32 ch, u32 dir, int dai_id) 1870 { 1871 struct sdw_cdns_pdi *pdi = NULL; 1872 1873 if (dir == SDW_DATA_DIR_RX) 1874 pdi = cdns_find_pdi(cdns, 0, stream->num_in, stream->in, 1875 dai_id); 1876 else 1877 pdi = cdns_find_pdi(cdns, 0, stream->num_out, stream->out, 1878 dai_id); 1879 1880 /* check if we found a PDI, else find in bi-directional */ 1881 if (!pdi) 1882 pdi = cdns_find_pdi(cdns, 2, stream->num_bd, stream->bd, 1883 dai_id); 1884 1885 if (pdi) { 1886 pdi->l_ch_num = 0; 1887 pdi->h_ch_num = ch - 1; 1888 pdi->dir = dir; 1889 pdi->ch_count = ch; 1890 } 1891 1892 return pdi; 1893 } 1894 EXPORT_SYMBOL(sdw_cdns_alloc_pdi); 1895 1896 MODULE_LICENSE("Dual BSD/GPL"); 1897 MODULE_DESCRIPTION("Cadence Soundwire Library"); 1898