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/cleanup.h> 10 #include <linux/delay.h> 11 #include <linux/device.h> 12 #include <linux/debugfs.h> 13 #include <linux/interrupt.h> 14 #include <linux/io.h> 15 #include <linux/module.h> 16 #include <linux/mod_devicetable.h> 17 #include <linux/pm_runtime.h> 18 #include <linux/soundwire/sdw_registers.h> 19 #include <linux/soundwire/sdw.h> 20 #include <sound/pcm_params.h> 21 #include <sound/soc.h> 22 #include <linux/workqueue.h> 23 #include "bus.h" 24 #include "cadence_master.h" 25 26 static int interrupt_mask; 27 module_param_named(cnds_mcp_int_mask, interrupt_mask, int, 0444); 28 MODULE_PARM_DESC(cdns_mcp_int_mask, "Cadence MCP IntMask"); 29 30 #define CDNS_MCP_CONFIG 0x0 31 #define CDNS_MCP_CONFIG_BUS_REL BIT(6) 32 33 #define CDNS_IP_MCP_CONFIG 0x0 /* IP offset added at run-time */ 34 35 #define CDNS_IP_MCP_CONFIG_MCMD_RETRY GENMASK(27, 24) 36 #define CDNS_IP_MCP_CONFIG_MPREQ_DELAY GENMASK(20, 16) 37 #define CDNS_IP_MCP_CONFIG_MMASTER BIT(7) 38 #define CDNS_IP_MCP_CONFIG_SNIFFER BIT(5) 39 #define CDNS_IP_MCP_CONFIG_CMD BIT(3) 40 #define CDNS_IP_MCP_CONFIG_OP GENMASK(2, 0) 41 #define CDNS_IP_MCP_CONFIG_OP_NORMAL 0 42 43 #define CDNS_MCP_CONTROL 0x4 44 45 #define CDNS_MCP_CONTROL_CMD_RST BIT(7) 46 #define CDNS_MCP_CONTROL_SOFT_RST BIT(6) 47 #define CDNS_MCP_CONTROL_HW_RST BIT(4) 48 #define CDNS_MCP_CONTROL_CLK_STOP_CLR BIT(2) 49 50 #define CDNS_IP_MCP_CONTROL 0x4 /* IP offset added at run-time */ 51 52 #define CDNS_IP_MCP_CONTROL_RST_DELAY GENMASK(10, 8) 53 #define CDNS_IP_MCP_CONTROL_SW_RST BIT(5) 54 #define CDNS_IP_MCP_CONTROL_CLK_PAUSE BIT(3) 55 #define CDNS_IP_MCP_CONTROL_CMD_ACCEPT BIT(1) 56 #define CDNS_IP_MCP_CONTROL_BLOCK_WAKEUP BIT(0) 57 58 #define CDNS_IP_MCP_CMDCTRL 0x8 /* IP offset added at run-time */ 59 60 #define CDNS_IP_MCP_CMDCTRL_INSERT_PARITY_ERR BIT(2) 61 62 #define CDNS_MCP_SSPSTAT 0xC 63 #define CDNS_MCP_FRAME_SHAPE 0x10 64 #define CDNS_MCP_FRAME_SHAPE_INIT 0x14 65 #define CDNS_MCP_FRAME_SHAPE_COL_MASK GENMASK(2, 0) 66 #define CDNS_MCP_FRAME_SHAPE_ROW_MASK GENMASK(7, 3) 67 68 #define CDNS_MCP_CONFIG_UPDATE 0x18 69 #define CDNS_MCP_CONFIG_UPDATE_BIT BIT(0) 70 71 #define CDNS_MCP_PHYCTRL 0x1C 72 #define CDNS_MCP_SSP_CTRL0 0x20 73 #define CDNS_MCP_SSP_CTRL1 0x28 74 #define CDNS_MCP_CLK_CTRL0 0x30 75 #define CDNS_MCP_CLK_CTRL1 0x38 76 #define CDNS_MCP_CLK_MCLKD_MASK GENMASK(7, 0) 77 78 #define CDNS_MCP_STAT 0x40 79 80 #define CDNS_MCP_STAT_ACTIVE_BANK BIT(20) 81 #define CDNS_MCP_STAT_CLK_STOP BIT(16) 82 83 #define CDNS_MCP_INTSTAT 0x44 84 #define CDNS_MCP_INTMASK 0x48 85 86 #define CDNS_MCP_INT_IRQ BIT(31) 87 #define CDNS_MCP_INT_RESERVED1 GENMASK(30, 17) 88 #define CDNS_MCP_INT_WAKEUP BIT(16) 89 #define CDNS_MCP_INT_SLAVE_RSVD BIT(15) 90 #define CDNS_MCP_INT_SLAVE_ALERT BIT(14) 91 #define CDNS_MCP_INT_SLAVE_ATTACH BIT(13) 92 #define CDNS_MCP_INT_SLAVE_NATTACH BIT(12) 93 #define CDNS_MCP_INT_SLAVE_MASK GENMASK(15, 12) 94 #define CDNS_MCP_INT_DPINT BIT(11) 95 #define CDNS_MCP_INT_CTRL_CLASH BIT(10) 96 #define CDNS_MCP_INT_DATA_CLASH BIT(9) 97 #define CDNS_MCP_INT_PARITY BIT(8) 98 #define CDNS_MCP_INT_CMD_ERR BIT(7) 99 #define CDNS_MCP_INT_RESERVED2 GENMASK(6, 4) 100 #define CDNS_MCP_INT_RX_NE BIT(3) 101 #define CDNS_MCP_INT_RX_WL BIT(2) 102 #define CDNS_MCP_INT_TXE BIT(1) 103 #define CDNS_MCP_INT_TXF BIT(0) 104 #define CDNS_MCP_INT_RESERVED (CDNS_MCP_INT_RESERVED1 | CDNS_MCP_INT_RESERVED2) 105 106 #define CDNS_MCP_INTSET 0x4C 107 108 #define CDNS_MCP_SLAVE_STAT 0x50 109 #define CDNS_MCP_SLAVE_STAT_MASK GENMASK(1, 0) 110 111 #define CDNS_MCP_SLAVE_INTSTAT0 0x54 112 #define CDNS_MCP_SLAVE_INTSTAT1 0x58 113 #define CDNS_MCP_SLAVE_INTSTAT_NPRESENT BIT(0) 114 #define CDNS_MCP_SLAVE_INTSTAT_ATTACHED BIT(1) 115 #define CDNS_MCP_SLAVE_INTSTAT_ALERT BIT(2) 116 #define CDNS_MCP_SLAVE_INTSTAT_RESERVED BIT(3) 117 #define CDNS_MCP_SLAVE_STATUS_BITS GENMASK(3, 0) 118 #define CDNS_MCP_SLAVE_STATUS_NUM 4 119 120 #define CDNS_MCP_SLAVE_INTMASK0 0x5C 121 #define CDNS_MCP_SLAVE_INTMASK1 0x60 122 123 #define CDNS_MCP_SLAVE_INTMASK0_MASK GENMASK(31, 0) 124 #define CDNS_MCP_SLAVE_INTMASK1_MASK GENMASK(15, 0) 125 126 #define CDNS_MCP_PORT_INTSTAT 0x64 127 #define CDNS_MCP_PDI_STAT 0x6C 128 129 #define CDNS_MCP_FIFOLEVEL 0x78 130 #define CDNS_MCP_FIFOSTAT 0x7C 131 #define CDNS_MCP_RX_FIFO_AVAIL GENMASK(5, 0) 132 133 #define CDNS_IP_MCP_CMD_BASE 0x80 /* IP offset added at run-time */ 134 #define CDNS_IP_MCP_RESP_BASE 0x80 /* IP offset added at run-time */ 135 /* FIFO can hold 8 commands */ 136 #define CDNS_MCP_CMD_LEN 8 137 #define CDNS_MCP_CMD_WORD_LEN 0x4 138 139 #define CDNS_MCP_CMD_SSP_TAG BIT(31) 140 #define CDNS_MCP_CMD_COMMAND GENMASK(30, 28) 141 #define CDNS_MCP_CMD_DEV_ADDR GENMASK(27, 24) 142 #define CDNS_MCP_CMD_REG_ADDR GENMASK(23, 8) 143 #define CDNS_MCP_CMD_REG_DATA GENMASK(7, 0) 144 145 #define CDNS_MCP_CMD_READ 2 146 #define CDNS_MCP_CMD_WRITE 3 147 148 #define CDNS_MCP_RESP_RDATA GENMASK(15, 8) 149 #define CDNS_MCP_RESP_ACK BIT(0) 150 #define CDNS_MCP_RESP_NACK BIT(1) 151 152 #define CDNS_DP_SIZE 128 153 154 #define CDNS_DPN_B0_CONFIG(n) (0x100 + CDNS_DP_SIZE * (n)) 155 #define CDNS_DPN_B0_CH_EN(n) (0x104 + CDNS_DP_SIZE * (n)) 156 #define CDNS_DPN_B0_SAMPLE_CTRL(n) (0x108 + CDNS_DP_SIZE * (n)) 157 #define CDNS_DPN_B0_OFFSET_CTRL(n) (0x10C + CDNS_DP_SIZE * (n)) 158 #define CDNS_DPN_B0_HCTRL(n) (0x110 + CDNS_DP_SIZE * (n)) 159 #define CDNS_DPN_B0_ASYNC_CTRL(n) (0x114 + CDNS_DP_SIZE * (n)) 160 161 #define CDNS_DPN_B1_CONFIG(n) (0x118 + CDNS_DP_SIZE * (n)) 162 #define CDNS_DPN_B1_CH_EN(n) (0x11C + CDNS_DP_SIZE * (n)) 163 #define CDNS_DPN_B1_SAMPLE_CTRL(n) (0x120 + CDNS_DP_SIZE * (n)) 164 #define CDNS_DPN_B1_OFFSET_CTRL(n) (0x124 + CDNS_DP_SIZE * (n)) 165 #define CDNS_DPN_B1_HCTRL(n) (0x128 + CDNS_DP_SIZE * (n)) 166 #define CDNS_DPN_B1_ASYNC_CTRL(n) (0x12C + CDNS_DP_SIZE * (n)) 167 168 #define CDNS_DPN_CONFIG_BPM BIT(18) 169 #define CDNS_DPN_CONFIG_BGC GENMASK(17, 16) 170 #define CDNS_DPN_CONFIG_WL GENMASK(12, 8) 171 #define CDNS_DPN_CONFIG_PORT_DAT GENMASK(3, 2) 172 #define CDNS_DPN_CONFIG_PORT_FLOW GENMASK(1, 0) 173 174 #define CDNS_DPN_SAMPLE_CTRL_SI GENMASK(15, 0) 175 176 #define CDNS_DPN_OFFSET_CTRL_1 GENMASK(7, 0) 177 #define CDNS_DPN_OFFSET_CTRL_2 GENMASK(15, 8) 178 179 #define CDNS_DPN_HCTRL_HSTOP GENMASK(3, 0) 180 #define CDNS_DPN_HCTRL_HSTART GENMASK(7, 4) 181 #define CDNS_DPN_HCTRL_LCTRL GENMASK(10, 8) 182 183 #define CDNS_PORTCTRL 0x130 184 #define CDNS_PORTCTRL_TEST_FAILED BIT(1) 185 #define CDNS_PORTCTRL_DIRN BIT(7) 186 #define CDNS_PORTCTRL_BANK_INVERT BIT(8) 187 188 #define CDNS_PORT_OFFSET 0x80 189 190 #define CDNS_PDI_CONFIG(n) (0x1100 + (n) * 16) 191 192 #define CDNS_PDI_CONFIG_SOFT_RESET BIT(24) 193 #define CDNS_PDI_CONFIG_CHANNEL GENMASK(15, 8) 194 #define CDNS_PDI_CONFIG_PORT GENMASK(4, 0) 195 196 /* Driver defaults */ 197 #define CDNS_TX_TIMEOUT 500 198 199 #define CDNS_SCP_RX_FIFOLEVEL 0x2 200 201 /* 202 * register accessor helpers 203 */ 204 static inline u32 cdns_readl(struct sdw_cdns *cdns, int offset) 205 { 206 return readl(cdns->registers + offset); 207 } 208 209 static inline void cdns_writel(struct sdw_cdns *cdns, int offset, u32 value) 210 { 211 writel(value, cdns->registers + offset); 212 } 213 214 static inline u32 cdns_ip_readl(struct sdw_cdns *cdns, int offset) 215 { 216 return cdns_readl(cdns, cdns->ip_offset + offset); 217 } 218 219 static inline void cdns_ip_writel(struct sdw_cdns *cdns, int offset, u32 value) 220 { 221 return cdns_writel(cdns, cdns->ip_offset + offset, value); 222 } 223 224 static inline void cdns_updatel(struct sdw_cdns *cdns, 225 int offset, u32 mask, u32 val) 226 { 227 u32 tmp; 228 229 tmp = cdns_readl(cdns, offset); 230 tmp = (tmp & ~mask) | val; 231 cdns_writel(cdns, offset, tmp); 232 } 233 234 static inline void cdns_ip_updatel(struct sdw_cdns *cdns, 235 int offset, u32 mask, u32 val) 236 { 237 cdns_updatel(cdns, cdns->ip_offset + offset, mask, val); 238 } 239 240 static int cdns_set_wait(struct sdw_cdns *cdns, int offset, u32 mask, u32 value) 241 { 242 int timeout = 10; 243 u32 reg_read; 244 245 /* Wait for bit to be set */ 246 do { 247 reg_read = readl(cdns->registers + offset); 248 if ((reg_read & mask) == value) 249 return 0; 250 251 timeout--; 252 usleep_range(50, 100); 253 } while (timeout != 0); 254 255 return -ETIMEDOUT; 256 } 257 258 static int cdns_clear_bit(struct sdw_cdns *cdns, int offset, u32 value) 259 { 260 writel(value, cdns->registers + offset); 261 262 /* Wait for bit to be self cleared */ 263 return cdns_set_wait(cdns, offset, value, 0); 264 } 265 266 /* 267 * all changes to the MCP_CONFIG, MCP_CONTROL, MCP_CMDCTRL and MCP_PHYCTRL 268 * need to be confirmed with a write to MCP_CONFIG_UPDATE 269 */ 270 static int cdns_config_update(struct sdw_cdns *cdns) 271 { 272 int ret; 273 274 if (sdw_cdns_is_clock_stop(cdns)) { 275 dev_err(cdns->dev, "Cannot program MCP_CONFIG_UPDATE in ClockStopMode\n"); 276 return -EINVAL; 277 } 278 279 ret = cdns_clear_bit(cdns, CDNS_MCP_CONFIG_UPDATE, 280 CDNS_MCP_CONFIG_UPDATE_BIT); 281 if (ret < 0) 282 dev_err(cdns->dev, "Config update timedout\n"); 283 284 return ret; 285 } 286 287 /** 288 * sdw_cdns_config_update() - Update configurations 289 * @cdns: Cadence instance 290 */ 291 void sdw_cdns_config_update(struct sdw_cdns *cdns) 292 { 293 /* commit changes */ 294 cdns_writel(cdns, CDNS_MCP_CONFIG_UPDATE, CDNS_MCP_CONFIG_UPDATE_BIT); 295 } 296 EXPORT_SYMBOL(sdw_cdns_config_update); 297 298 /** 299 * sdw_cdns_config_update_set_wait() - wait until configuration update bit is self-cleared 300 * @cdns: Cadence instance 301 */ 302 int sdw_cdns_config_update_set_wait(struct sdw_cdns *cdns) 303 { 304 /* the hardware recommendation is to wait at least 300us */ 305 return cdns_set_wait(cdns, CDNS_MCP_CONFIG_UPDATE, 306 CDNS_MCP_CONFIG_UPDATE_BIT, 0); 307 } 308 EXPORT_SYMBOL(sdw_cdns_config_update_set_wait); 309 310 /* 311 * debugfs 312 */ 313 #ifdef CONFIG_DEBUG_FS 314 315 #define RD_BUF (2 * PAGE_SIZE) 316 317 static ssize_t cdns_sprintf(struct sdw_cdns *cdns, 318 char *buf, size_t pos, unsigned int reg) 319 { 320 return scnprintf(buf + pos, RD_BUF - pos, 321 "%4x\t%8x\n", reg, cdns_readl(cdns, reg)); 322 } 323 324 static int cdns_reg_show(struct seq_file *s, void *data) 325 { 326 struct sdw_cdns *cdns = s->private; 327 ssize_t ret; 328 int num_ports; 329 int i, j; 330 331 char *buf __free(kfree) = 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); 392 393 return 0; 394 } 395 DEFINE_SHOW_ATTRIBUTE(cdns_reg); 396 397 static int cdns_hw_reset(void *data, u64 value) 398 { 399 struct sdw_cdns *cdns = data; 400 int ret; 401 402 if (value != 1) 403 return -EINVAL; 404 405 /* Userspace changed the hardware state behind the kernel's back */ 406 add_taint(TAINT_USER, LOCKDEP_STILL_OK); 407 408 ret = sdw_cdns_exit_reset(cdns); 409 410 dev_dbg(cdns->dev, "link hw_reset done: %d\n", ret); 411 412 return ret; 413 } 414 415 DEFINE_DEBUGFS_ATTRIBUTE(cdns_hw_reset_fops, NULL, cdns_hw_reset, "%llu\n"); 416 417 static int cdns_parity_error_injection(void *data, u64 value) 418 { 419 struct sdw_cdns *cdns = data; 420 struct sdw_bus *bus; 421 int ret; 422 423 if (value != 1) 424 return -EINVAL; 425 426 bus = &cdns->bus; 427 428 /* 429 * Resume Master device. If this results in a bus reset, the 430 * Slave devices will re-attach and be re-enumerated. 431 */ 432 ret = pm_runtime_resume_and_get(bus->dev); 433 if (ret < 0 && ret != -EACCES) { 434 dev_err_ratelimited(cdns->dev, 435 "pm_runtime_resume_and_get failed in %s, ret %d\n", 436 __func__, ret); 437 return ret; 438 } 439 440 /* 441 * wait long enough for Slave(s) to be in steady state. This 442 * does not need to be super precise. 443 */ 444 msleep(200); 445 446 /* 447 * Take the bus lock here to make sure that any bus transactions 448 * will be queued while we inject a parity error on a dummy read 449 */ 450 mutex_lock(&bus->bus_lock); 451 452 /* program hardware to inject parity error */ 453 cdns_ip_updatel(cdns, CDNS_IP_MCP_CMDCTRL, 454 CDNS_IP_MCP_CMDCTRL_INSERT_PARITY_ERR, 455 CDNS_IP_MCP_CMDCTRL_INSERT_PARITY_ERR); 456 457 /* commit changes */ 458 ret = cdns_clear_bit(cdns, CDNS_MCP_CONFIG_UPDATE, CDNS_MCP_CONFIG_UPDATE_BIT); 459 if (ret < 0) 460 goto unlock; 461 462 /* do a broadcast dummy read to avoid bus clashes */ 463 ret = sdw_bread_no_pm_unlocked(&cdns->bus, 0xf, SDW_SCP_DEVID_0); 464 dev_info(cdns->dev, "parity error injection, read: %d\n", ret); 465 466 /* program hardware to disable parity error */ 467 cdns_ip_updatel(cdns, CDNS_IP_MCP_CMDCTRL, 468 CDNS_IP_MCP_CMDCTRL_INSERT_PARITY_ERR, 469 0); 470 471 /* commit changes */ 472 ret = cdns_clear_bit(cdns, CDNS_MCP_CONFIG_UPDATE, CDNS_MCP_CONFIG_UPDATE_BIT); 473 if (ret < 0) 474 goto unlock; 475 476 /* Userspace changed the hardware state behind the kernel's back */ 477 add_taint(TAINT_USER, LOCKDEP_STILL_OK); 478 479 unlock: 480 /* Continue bus operation with parity error injection disabled */ 481 mutex_unlock(&bus->bus_lock); 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 int ret; 895 896 mutex_lock(&cdns->status_update_lock); 897 ret = sdw_handle_slave_status(&cdns->bus, status); 898 mutex_unlock(&cdns->status_update_lock); 899 return ret; 900 } 901 902 return 0; 903 } 904 905 /** 906 * sdw_cdns_irq() - Cadence interrupt handler 907 * @irq: irq number 908 * @dev_id: irq context 909 */ 910 irqreturn_t sdw_cdns_irq(int irq, void *dev_id) 911 { 912 struct sdw_cdns *cdns = dev_id; 913 u32 int_status; 914 915 /* Check if the link is up */ 916 if (!cdns->link_up) 917 return IRQ_NONE; 918 919 int_status = cdns_readl(cdns, CDNS_MCP_INTSTAT); 920 921 /* check for reserved values read as zero */ 922 if (int_status & CDNS_MCP_INT_RESERVED) 923 return IRQ_NONE; 924 925 if (!(int_status & CDNS_MCP_INT_IRQ)) 926 return IRQ_NONE; 927 928 if (int_status & CDNS_MCP_INT_RX_WL) { 929 struct sdw_bus *bus = &cdns->bus; 930 struct sdw_defer *defer = &bus->defer_msg; 931 932 cdns_read_response(cdns); 933 934 if (defer && defer->msg) { 935 cdns_fill_msg_resp(cdns, defer->msg, 936 defer->length, 0); 937 complete(&defer->complete); 938 } else { 939 complete(&cdns->tx_complete); 940 } 941 } 942 943 if (int_status & CDNS_MCP_INT_PARITY) { 944 /* Parity error detected by Master */ 945 dev_err_ratelimited(cdns->dev, "Parity error\n"); 946 } 947 948 if (int_status & CDNS_MCP_INT_CTRL_CLASH) { 949 /* Slave is driving bit slot during control word */ 950 dev_err_ratelimited(cdns->dev, "Bus clash for control word\n"); 951 } 952 953 if (int_status & CDNS_MCP_INT_DATA_CLASH) { 954 /* 955 * Multiple slaves trying to drive bit slot, or issue with 956 * ownership of data bits or Slave gone bonkers 957 */ 958 dev_err_ratelimited(cdns->dev, "Bus clash for data word\n"); 959 } 960 961 if (cdns->bus.params.m_data_mode != SDW_PORT_DATA_MODE_NORMAL && 962 int_status & CDNS_MCP_INT_DPINT) { 963 u32 port_intstat; 964 965 /* just log which ports report an error */ 966 port_intstat = cdns_readl(cdns, CDNS_MCP_PORT_INTSTAT); 967 dev_err_ratelimited(cdns->dev, "DP interrupt: PortIntStat %8x\n", 968 port_intstat); 969 970 /* clear status w/ write1 */ 971 cdns_writel(cdns, CDNS_MCP_PORT_INTSTAT, port_intstat); 972 } 973 974 if (int_status & CDNS_MCP_INT_SLAVE_MASK) { 975 /* Mask the Slave interrupt and wake thread */ 976 cdns_updatel(cdns, CDNS_MCP_INTMASK, 977 CDNS_MCP_INT_SLAVE_MASK, 0); 978 979 int_status &= ~CDNS_MCP_INT_SLAVE_MASK; 980 981 /* 982 * Deal with possible race condition between interrupt 983 * handling and disabling interrupts on suspend. 984 * 985 * If the master is in the process of disabling 986 * interrupts, don't schedule a workqueue 987 */ 988 if (cdns->interrupt_enabled) 989 schedule_work(&cdns->work); 990 } 991 992 cdns_writel(cdns, CDNS_MCP_INTSTAT, int_status); 993 return IRQ_HANDLED; 994 } 995 EXPORT_SYMBOL(sdw_cdns_irq); 996 997 static void cdns_check_attached_status_dwork(struct work_struct *work) 998 { 999 struct sdw_cdns *cdns = 1000 container_of(work, struct sdw_cdns, attach_dwork.work); 1001 enum sdw_slave_status status[SDW_MAX_DEVICES + 1]; 1002 u32 val; 1003 int ret; 1004 int i; 1005 1006 val = cdns_readl(cdns, CDNS_MCP_SLAVE_STAT); 1007 1008 for (i = 0; i <= SDW_MAX_DEVICES; i++) { 1009 status[i] = val & 0x3; 1010 if (status[i]) 1011 dev_dbg(cdns->dev, "Peripheral %d status: %d\n", i, status[i]); 1012 val >>= 2; 1013 } 1014 1015 mutex_lock(&cdns->status_update_lock); 1016 ret = sdw_handle_slave_status(&cdns->bus, status); 1017 mutex_unlock(&cdns->status_update_lock); 1018 if (ret < 0) 1019 dev_err(cdns->dev, "%s: sdw_handle_slave_status failed: %d\n", __func__, ret); 1020 } 1021 1022 /** 1023 * cdns_update_slave_status_work - update slave status in a work since we will need to handle 1024 * other interrupts eg. CDNS_MCP_INT_RX_WL during the update slave 1025 * process. 1026 * @work: cdns worker thread 1027 */ 1028 static void cdns_update_slave_status_work(struct work_struct *work) 1029 { 1030 struct sdw_cdns *cdns = 1031 container_of(work, struct sdw_cdns, work); 1032 u32 slave0, slave1; 1033 u64 slave_intstat; 1034 u32 device0_status; 1035 int retry_count = 0; 1036 1037 /* 1038 * Clear main interrupt first so we don't lose any assertions 1039 * that happen during this function. 1040 */ 1041 cdns_writel(cdns, CDNS_MCP_INTSTAT, CDNS_MCP_INT_SLAVE_MASK); 1042 1043 slave0 = cdns_readl(cdns, CDNS_MCP_SLAVE_INTSTAT0); 1044 slave1 = cdns_readl(cdns, CDNS_MCP_SLAVE_INTSTAT1); 1045 1046 /* 1047 * Clear the bits before handling so we don't lose any 1048 * bits that re-assert. 1049 */ 1050 cdns_writel(cdns, CDNS_MCP_SLAVE_INTSTAT0, slave0); 1051 cdns_writel(cdns, CDNS_MCP_SLAVE_INTSTAT1, slave1); 1052 1053 /* combine the two status */ 1054 slave_intstat = ((u64)slave1 << 32) | slave0; 1055 1056 dev_dbg_ratelimited(cdns->dev, "Slave status change: 0x%llx\n", slave_intstat); 1057 1058 update_status: 1059 cdns_update_slave_status(cdns, slave_intstat); 1060 1061 /* 1062 * When there is more than one peripheral per link, it's 1063 * possible that a deviceB becomes attached after we deal with 1064 * the attachment of deviceA. Since the hardware does a 1065 * logical AND, the attachment of the second device does not 1066 * change the status seen by the driver. 1067 * 1068 * In that case, clearing the registers above would result in 1069 * the deviceB never being detected - until a change of status 1070 * is observed on the bus. 1071 * 1072 * To avoid this race condition, re-check if any device0 needs 1073 * attention with PING commands. There is no need to check for 1074 * ALERTS since they are not allowed until a non-zero 1075 * device_number is assigned. 1076 * 1077 * Do not clear the INTSTAT0/1. While looping to enumerate devices on 1078 * #0 there could be status changes on other devices - these must 1079 * be kept in the INTSTAT so they can be handled when all #0 devices 1080 * have been handled. 1081 */ 1082 1083 device0_status = cdns_readl(cdns, CDNS_MCP_SLAVE_STAT); 1084 device0_status &= 3; 1085 1086 if (device0_status == SDW_SLAVE_ATTACHED) { 1087 if (retry_count++ < SDW_MAX_DEVICES) { 1088 dev_dbg_ratelimited(cdns->dev, 1089 "Device0 detected after clearing status, iteration %d\n", 1090 retry_count); 1091 slave_intstat = CDNS_MCP_SLAVE_INTSTAT_ATTACHED; 1092 goto update_status; 1093 } else { 1094 dev_err_ratelimited(cdns->dev, 1095 "Device0 detected after %d iterations\n", 1096 retry_count); 1097 } 1098 } 1099 1100 /* unmask Slave interrupt now */ 1101 cdns_updatel(cdns, CDNS_MCP_INTMASK, 1102 CDNS_MCP_INT_SLAVE_MASK, CDNS_MCP_INT_SLAVE_MASK); 1103 1104 } 1105 1106 /* paranoia check to make sure self-cleared bits are indeed cleared */ 1107 void sdw_cdns_check_self_clearing_bits(struct sdw_cdns *cdns, const char *string, 1108 bool initial_delay, int reset_iterations) 1109 { 1110 u32 ip_mcp_control; 1111 u32 mcp_control; 1112 u32 mcp_config_update; 1113 int i; 1114 1115 if (initial_delay) 1116 usleep_range(1000, 1500); 1117 1118 ip_mcp_control = cdns_ip_readl(cdns, CDNS_IP_MCP_CONTROL); 1119 1120 /* the following bits should be cleared immediately */ 1121 if (ip_mcp_control & CDNS_IP_MCP_CONTROL_SW_RST) 1122 dev_err(cdns->dev, "%s failed: IP_MCP_CONTROL_SW_RST is not cleared\n", string); 1123 1124 mcp_control = cdns_readl(cdns, CDNS_MCP_CONTROL); 1125 1126 /* the following bits should be cleared immediately */ 1127 if (mcp_control & CDNS_MCP_CONTROL_CMD_RST) 1128 dev_err(cdns->dev, "%s failed: MCP_CONTROL_CMD_RST is not cleared\n", string); 1129 if (mcp_control & CDNS_MCP_CONTROL_SOFT_RST) 1130 dev_err(cdns->dev, "%s failed: MCP_CONTROL_SOFT_RST is not cleared\n", string); 1131 if (mcp_control & CDNS_MCP_CONTROL_CLK_STOP_CLR) 1132 dev_err(cdns->dev, "%s failed: MCP_CONTROL_CLK_STOP_CLR is not cleared\n", string); 1133 1134 mcp_config_update = cdns_readl(cdns, CDNS_MCP_CONFIG_UPDATE); 1135 if (mcp_config_update & CDNS_MCP_CONFIG_UPDATE_BIT) 1136 dev_err(cdns->dev, "%s failed: MCP_CONFIG_UPDATE_BIT is not cleared\n", string); 1137 1138 i = 0; 1139 while (mcp_control & CDNS_MCP_CONTROL_HW_RST) { 1140 if (i == reset_iterations) { 1141 dev_err(cdns->dev, "%s failed: MCP_CONTROL_HW_RST is not cleared\n", string); 1142 break; 1143 } 1144 1145 dev_dbg(cdns->dev, "%s: MCP_CONTROL_HW_RST is not cleared at iteration %d\n", string, i); 1146 i++; 1147 1148 usleep_range(1000, 1500); 1149 mcp_control = cdns_readl(cdns, CDNS_MCP_CONTROL); 1150 } 1151 1152 } 1153 EXPORT_SYMBOL(sdw_cdns_check_self_clearing_bits); 1154 1155 /* 1156 * init routines 1157 */ 1158 1159 /** 1160 * sdw_cdns_exit_reset() - Program reset parameters and start bus operations 1161 * @cdns: Cadence instance 1162 */ 1163 int sdw_cdns_exit_reset(struct sdw_cdns *cdns) 1164 { 1165 /* keep reset delay unchanged to 4096 cycles */ 1166 1167 /* use hardware generated reset */ 1168 cdns_updatel(cdns, CDNS_MCP_CONTROL, 1169 CDNS_MCP_CONTROL_HW_RST, 1170 CDNS_MCP_CONTROL_HW_RST); 1171 1172 /* commit changes */ 1173 return cdns_config_update(cdns); 1174 } 1175 EXPORT_SYMBOL(sdw_cdns_exit_reset); 1176 1177 /** 1178 * cdns_enable_slave_interrupts() - Enable SDW slave interrupts 1179 * @cdns: Cadence instance 1180 * @state: boolean for true/false 1181 */ 1182 static void cdns_enable_slave_interrupts(struct sdw_cdns *cdns, bool state) 1183 { 1184 u32 mask; 1185 1186 mask = cdns_readl(cdns, CDNS_MCP_INTMASK); 1187 if (state) 1188 mask |= CDNS_MCP_INT_SLAVE_MASK; 1189 else 1190 mask &= ~CDNS_MCP_INT_SLAVE_MASK; 1191 1192 cdns_writel(cdns, CDNS_MCP_INTMASK, mask); 1193 } 1194 1195 /** 1196 * sdw_cdns_enable_interrupt() - Enable SDW interrupts 1197 * @cdns: Cadence instance 1198 * @state: True if we are trying to enable interrupt. 1199 */ 1200 int sdw_cdns_enable_interrupt(struct sdw_cdns *cdns, bool state) 1201 { 1202 u32 slave_intmask0 = 0; 1203 u32 slave_intmask1 = 0; 1204 u32 mask = 0; 1205 1206 if (!state) 1207 goto update_masks; 1208 1209 slave_intmask0 = CDNS_MCP_SLAVE_INTMASK0_MASK; 1210 slave_intmask1 = CDNS_MCP_SLAVE_INTMASK1_MASK; 1211 1212 /* enable detection of all slave state changes */ 1213 mask = CDNS_MCP_INT_SLAVE_MASK; 1214 1215 /* enable detection of bus issues */ 1216 mask |= CDNS_MCP_INT_CTRL_CLASH | CDNS_MCP_INT_DATA_CLASH | 1217 CDNS_MCP_INT_PARITY; 1218 1219 /* port interrupt limited to test modes for now */ 1220 if (cdns->bus.params.m_data_mode != SDW_PORT_DATA_MODE_NORMAL) 1221 mask |= CDNS_MCP_INT_DPINT; 1222 1223 /* enable detection of RX fifo level */ 1224 mask |= CDNS_MCP_INT_RX_WL; 1225 1226 /* 1227 * CDNS_MCP_INT_IRQ needs to be set otherwise all previous 1228 * settings are irrelevant 1229 */ 1230 mask |= CDNS_MCP_INT_IRQ; 1231 1232 if (interrupt_mask) /* parameter override */ 1233 mask = interrupt_mask; 1234 1235 update_masks: 1236 /* clear slave interrupt status before enabling interrupt */ 1237 if (state) { 1238 u32 slave_state; 1239 1240 slave_state = cdns_readl(cdns, CDNS_MCP_SLAVE_INTSTAT0); 1241 cdns_writel(cdns, CDNS_MCP_SLAVE_INTSTAT0, slave_state); 1242 slave_state = cdns_readl(cdns, CDNS_MCP_SLAVE_INTSTAT1); 1243 cdns_writel(cdns, CDNS_MCP_SLAVE_INTSTAT1, slave_state); 1244 } 1245 cdns->interrupt_enabled = state; 1246 1247 /* 1248 * Complete any on-going status updates before updating masks, 1249 * and cancel queued status updates. 1250 * 1251 * There could be a race with a new interrupt thrown before 1252 * the 3 mask updates below are complete, so in the interrupt 1253 * we use the 'interrupt_enabled' status to prevent new work 1254 * from being queued. 1255 */ 1256 if (!state) 1257 cancel_work_sync(&cdns->work); 1258 1259 cdns_writel(cdns, CDNS_MCP_SLAVE_INTMASK0, slave_intmask0); 1260 cdns_writel(cdns, CDNS_MCP_SLAVE_INTMASK1, slave_intmask1); 1261 cdns_writel(cdns, CDNS_MCP_INTMASK, mask); 1262 1263 return 0; 1264 } 1265 EXPORT_SYMBOL(sdw_cdns_enable_interrupt); 1266 1267 static int cdns_allocate_pdi(struct sdw_cdns *cdns, 1268 struct sdw_cdns_pdi **stream, 1269 u32 num) 1270 { 1271 struct sdw_cdns_pdi *pdi; 1272 int i; 1273 1274 if (!num) 1275 return 0; 1276 1277 pdi = devm_kcalloc(cdns->dev, num, sizeof(*pdi), GFP_KERNEL); 1278 if (!pdi) 1279 return -ENOMEM; 1280 1281 for (i = 0; i < num; i++) { 1282 pdi[i].num = i; 1283 } 1284 1285 *stream = pdi; 1286 return 0; 1287 } 1288 1289 /** 1290 * sdw_cdns_pdi_init() - PDI initialization routine 1291 * 1292 * @cdns: Cadence instance 1293 * @config: Stream configurations 1294 */ 1295 int sdw_cdns_pdi_init(struct sdw_cdns *cdns, 1296 struct sdw_cdns_stream_config config) 1297 { 1298 struct sdw_cdns_streams *stream; 1299 int ret; 1300 1301 cdns->pcm.num_bd = config.pcm_bd; 1302 cdns->pcm.num_in = config.pcm_in; 1303 cdns->pcm.num_out = config.pcm_out; 1304 1305 /* Allocate PDIs for PCMs */ 1306 stream = &cdns->pcm; 1307 1308 /* we allocate PDI0 and PDI1 which are used for Bulk */ 1309 ret = cdns_allocate_pdi(cdns, &stream->bd, stream->num_bd); 1310 if (ret) 1311 return ret; 1312 1313 ret = cdns_allocate_pdi(cdns, &stream->in, stream->num_in); 1314 if (ret) 1315 return ret; 1316 1317 ret = cdns_allocate_pdi(cdns, &stream->out, stream->num_out); 1318 if (ret) 1319 return ret; 1320 1321 /* Update total number of PCM PDIs */ 1322 stream->num_pdi = stream->num_bd + stream->num_in + stream->num_out; 1323 cdns->num_ports = stream->num_pdi; 1324 1325 return 0; 1326 } 1327 EXPORT_SYMBOL(sdw_cdns_pdi_init); 1328 1329 static u32 cdns_set_initial_frame_shape(int n_rows, int n_cols) 1330 { 1331 u32 val; 1332 int c; 1333 int r; 1334 1335 r = sdw_find_row_index(n_rows); 1336 c = sdw_find_col_index(n_cols); 1337 1338 val = FIELD_PREP(CDNS_MCP_FRAME_SHAPE_ROW_MASK, r); 1339 val |= FIELD_PREP(CDNS_MCP_FRAME_SHAPE_COL_MASK, c); 1340 1341 return val; 1342 } 1343 1344 static void cdns_init_clock_ctrl(struct sdw_cdns *cdns) 1345 { 1346 struct sdw_bus *bus = &cdns->bus; 1347 struct sdw_master_prop *prop = &bus->prop; 1348 u32 val; 1349 u32 ssp_interval; 1350 int divider; 1351 1352 dev_dbg(cdns->dev, "mclk %d max %d row %d col %d\n", 1353 prop->mclk_freq, 1354 prop->max_clk_freq, 1355 prop->default_row, 1356 prop->default_col); 1357 1358 /* Set clock divider */ 1359 divider = (prop->mclk_freq / prop->max_clk_freq) - 1; 1360 1361 cdns_updatel(cdns, CDNS_MCP_CLK_CTRL0, 1362 CDNS_MCP_CLK_MCLKD_MASK, divider); 1363 cdns_updatel(cdns, CDNS_MCP_CLK_CTRL1, 1364 CDNS_MCP_CLK_MCLKD_MASK, divider); 1365 1366 /* 1367 * Frame shape changes after initialization have to be done 1368 * with the bank switch mechanism 1369 */ 1370 val = cdns_set_initial_frame_shape(prop->default_row, 1371 prop->default_col); 1372 cdns_writel(cdns, CDNS_MCP_FRAME_SHAPE_INIT, val); 1373 1374 /* Set SSP interval to default value */ 1375 ssp_interval = prop->default_frame_rate / SDW_CADENCE_GSYNC_HZ; 1376 cdns_writel(cdns, CDNS_MCP_SSP_CTRL0, ssp_interval); 1377 cdns_writel(cdns, CDNS_MCP_SSP_CTRL1, ssp_interval); 1378 } 1379 1380 /** 1381 * sdw_cdns_soft_reset() - Cadence soft-reset 1382 * @cdns: Cadence instance 1383 */ 1384 int sdw_cdns_soft_reset(struct sdw_cdns *cdns) 1385 { 1386 int ret; 1387 1388 cdns_updatel(cdns, CDNS_MCP_CONTROL, CDNS_MCP_CONTROL_SOFT_RST, 1389 CDNS_MCP_CONTROL_SOFT_RST); 1390 1391 ret = cdns_config_update(cdns); 1392 if (ret < 0) { 1393 dev_err(cdns->dev, "%s: config update failed\n", __func__); 1394 return ret; 1395 } 1396 1397 ret = cdns_set_wait(cdns, CDNS_MCP_CONTROL, CDNS_MCP_CONTROL_SOFT_RST, 0); 1398 if (ret < 0) 1399 dev_err(cdns->dev, "%s: Soft Reset timed out\n", __func__); 1400 1401 return ret; 1402 } 1403 EXPORT_SYMBOL(sdw_cdns_soft_reset); 1404 1405 /** 1406 * sdw_cdns_init() - Cadence initialization 1407 * @cdns: Cadence instance 1408 */ 1409 int sdw_cdns_init(struct sdw_cdns *cdns) 1410 { 1411 u32 val; 1412 1413 cdns_init_clock_ctrl(cdns); 1414 1415 sdw_cdns_check_self_clearing_bits(cdns, __func__, false, 0); 1416 1417 /* reset msg_count to default value of FIFOLEVEL */ 1418 cdns->msg_count = cdns_readl(cdns, CDNS_MCP_FIFOLEVEL); 1419 1420 /* flush command FIFOs */ 1421 cdns_updatel(cdns, CDNS_MCP_CONTROL, CDNS_MCP_CONTROL_CMD_RST, 1422 CDNS_MCP_CONTROL_CMD_RST); 1423 1424 /* Set cmd accept mode */ 1425 cdns_ip_updatel(cdns, CDNS_IP_MCP_CONTROL, CDNS_IP_MCP_CONTROL_CMD_ACCEPT, 1426 CDNS_IP_MCP_CONTROL_CMD_ACCEPT); 1427 1428 /* disable wakeup */ 1429 cdns_ip_updatel(cdns, CDNS_IP_MCP_CONTROL, 1430 CDNS_IP_MCP_CONTROL_BLOCK_WAKEUP, 1431 0); 1432 1433 /* Configure mcp config */ 1434 val = cdns_readl(cdns, CDNS_MCP_CONFIG); 1435 1436 /* Disable auto bus release */ 1437 val &= ~CDNS_MCP_CONFIG_BUS_REL; 1438 1439 cdns_writel(cdns, CDNS_MCP_CONFIG, val); 1440 1441 /* Configure IP mcp config */ 1442 val = cdns_ip_readl(cdns, CDNS_IP_MCP_CONFIG); 1443 1444 /* enable bus operations with clock and data */ 1445 val &= ~CDNS_IP_MCP_CONFIG_OP; 1446 val |= CDNS_IP_MCP_CONFIG_OP_NORMAL; 1447 1448 /* Set cmd mode for Tx and Rx cmds */ 1449 val &= ~CDNS_IP_MCP_CONFIG_CMD; 1450 1451 /* Disable sniffer mode */ 1452 val &= ~CDNS_IP_MCP_CONFIG_SNIFFER; 1453 1454 if (cdns->bus.multi_link) 1455 /* Set Multi-master mode to take gsync into account */ 1456 val |= CDNS_IP_MCP_CONFIG_MMASTER; 1457 1458 /* leave frame delay to hardware default of 0x1F */ 1459 1460 /* leave command retry to hardware default of 0 */ 1461 1462 cdns_ip_writel(cdns, CDNS_IP_MCP_CONFIG, val); 1463 1464 /* changes will be committed later */ 1465 return 0; 1466 } 1467 EXPORT_SYMBOL(sdw_cdns_init); 1468 1469 int cdns_bus_conf(struct sdw_bus *bus, struct sdw_bus_params *params) 1470 { 1471 struct sdw_master_prop *prop = &bus->prop; 1472 struct sdw_cdns *cdns = bus_to_cdns(bus); 1473 int mcp_clkctrl_off; 1474 int divider; 1475 1476 if (!params->curr_dr_freq) { 1477 dev_err(cdns->dev, "NULL curr_dr_freq\n"); 1478 return -EINVAL; 1479 } 1480 1481 divider = prop->mclk_freq * SDW_DOUBLE_RATE_FACTOR / 1482 params->curr_dr_freq; 1483 divider--; /* divider is 1/(N+1) */ 1484 1485 if (params->next_bank) 1486 mcp_clkctrl_off = CDNS_MCP_CLK_CTRL1; 1487 else 1488 mcp_clkctrl_off = CDNS_MCP_CLK_CTRL0; 1489 1490 cdns_updatel(cdns, mcp_clkctrl_off, CDNS_MCP_CLK_MCLKD_MASK, divider); 1491 1492 return 0; 1493 } 1494 EXPORT_SYMBOL(cdns_bus_conf); 1495 1496 static int cdns_port_params(struct sdw_bus *bus, 1497 struct sdw_port_params *p_params, unsigned int bank) 1498 { 1499 struct sdw_cdns *cdns = bus_to_cdns(bus); 1500 int dpn_config_off_source; 1501 int dpn_config_off_target; 1502 int target_num = p_params->num; 1503 int source_num = p_params->num; 1504 bool override = false; 1505 int dpn_config; 1506 1507 if (target_num == cdns->pdi_loopback_target && 1508 cdns->pdi_loopback_source != -1) { 1509 source_num = cdns->pdi_loopback_source; 1510 override = true; 1511 } 1512 1513 if (bank) { 1514 dpn_config_off_source = CDNS_DPN_B1_CONFIG(source_num); 1515 dpn_config_off_target = CDNS_DPN_B1_CONFIG(target_num); 1516 } else { 1517 dpn_config_off_source = CDNS_DPN_B0_CONFIG(source_num); 1518 dpn_config_off_target = CDNS_DPN_B0_CONFIG(target_num); 1519 } 1520 1521 dpn_config = cdns_readl(cdns, dpn_config_off_source); 1522 1523 /* use port params if there is no loopback, otherwise use source as is */ 1524 if (!override) { 1525 u32p_replace_bits(&dpn_config, p_params->bps - 1, CDNS_DPN_CONFIG_WL); 1526 u32p_replace_bits(&dpn_config, p_params->flow_mode, CDNS_DPN_CONFIG_PORT_FLOW); 1527 u32p_replace_bits(&dpn_config, p_params->data_mode, CDNS_DPN_CONFIG_PORT_DAT); 1528 } 1529 1530 cdns_writel(cdns, dpn_config_off_target, dpn_config); 1531 1532 return 0; 1533 } 1534 1535 static int cdns_transport_params(struct sdw_bus *bus, 1536 struct sdw_transport_params *t_params, 1537 enum sdw_reg_bank bank) 1538 { 1539 struct sdw_cdns *cdns = bus_to_cdns(bus); 1540 int dpn_config; 1541 int dpn_config_off_source; 1542 int dpn_config_off_target; 1543 int dpn_hctrl; 1544 int dpn_hctrl_off_source; 1545 int dpn_hctrl_off_target; 1546 int dpn_offsetctrl; 1547 int dpn_offsetctrl_off_source; 1548 int dpn_offsetctrl_off_target; 1549 int dpn_samplectrl; 1550 int dpn_samplectrl_off_source; 1551 int dpn_samplectrl_off_target; 1552 int source_num = t_params->port_num; 1553 int target_num = t_params->port_num; 1554 bool override = false; 1555 1556 if (target_num == cdns->pdi_loopback_target && 1557 cdns->pdi_loopback_source != -1) { 1558 source_num = cdns->pdi_loopback_source; 1559 override = true; 1560 } 1561 1562 /* 1563 * Note: Only full data port is supported on the Master side for 1564 * both PCM and PDM ports. 1565 */ 1566 1567 if (bank) { 1568 dpn_config_off_source = CDNS_DPN_B1_CONFIG(source_num); 1569 dpn_hctrl_off_source = CDNS_DPN_B1_HCTRL(source_num); 1570 dpn_offsetctrl_off_source = CDNS_DPN_B1_OFFSET_CTRL(source_num); 1571 dpn_samplectrl_off_source = CDNS_DPN_B1_SAMPLE_CTRL(source_num); 1572 1573 dpn_config_off_target = CDNS_DPN_B1_CONFIG(target_num); 1574 dpn_hctrl_off_target = CDNS_DPN_B1_HCTRL(target_num); 1575 dpn_offsetctrl_off_target = CDNS_DPN_B1_OFFSET_CTRL(target_num); 1576 dpn_samplectrl_off_target = CDNS_DPN_B1_SAMPLE_CTRL(target_num); 1577 1578 } else { 1579 dpn_config_off_source = CDNS_DPN_B0_CONFIG(source_num); 1580 dpn_hctrl_off_source = CDNS_DPN_B0_HCTRL(source_num); 1581 dpn_offsetctrl_off_source = CDNS_DPN_B0_OFFSET_CTRL(source_num); 1582 dpn_samplectrl_off_source = CDNS_DPN_B0_SAMPLE_CTRL(source_num); 1583 1584 dpn_config_off_target = CDNS_DPN_B0_CONFIG(target_num); 1585 dpn_hctrl_off_target = CDNS_DPN_B0_HCTRL(target_num); 1586 dpn_offsetctrl_off_target = CDNS_DPN_B0_OFFSET_CTRL(target_num); 1587 dpn_samplectrl_off_target = CDNS_DPN_B0_SAMPLE_CTRL(target_num); 1588 } 1589 1590 dpn_config = cdns_readl(cdns, dpn_config_off_source); 1591 if (!override) { 1592 u32p_replace_bits(&dpn_config, t_params->blk_grp_ctrl, CDNS_DPN_CONFIG_BGC); 1593 u32p_replace_bits(&dpn_config, t_params->blk_pkg_mode, CDNS_DPN_CONFIG_BPM); 1594 } 1595 cdns_writel(cdns, dpn_config_off_target, dpn_config); 1596 1597 if (!override) { 1598 dpn_offsetctrl = 0; 1599 u32p_replace_bits(&dpn_offsetctrl, t_params->offset1, CDNS_DPN_OFFSET_CTRL_1); 1600 u32p_replace_bits(&dpn_offsetctrl, t_params->offset2, CDNS_DPN_OFFSET_CTRL_2); 1601 } else { 1602 dpn_offsetctrl = cdns_readl(cdns, dpn_offsetctrl_off_source); 1603 } 1604 cdns_writel(cdns, dpn_offsetctrl_off_target, dpn_offsetctrl); 1605 1606 if (!override) { 1607 dpn_hctrl = 0; 1608 u32p_replace_bits(&dpn_hctrl, t_params->hstart, CDNS_DPN_HCTRL_HSTART); 1609 u32p_replace_bits(&dpn_hctrl, t_params->hstop, CDNS_DPN_HCTRL_HSTOP); 1610 u32p_replace_bits(&dpn_hctrl, t_params->lane_ctrl, CDNS_DPN_HCTRL_LCTRL); 1611 } else { 1612 dpn_hctrl = cdns_readl(cdns, dpn_hctrl_off_source); 1613 } 1614 cdns_writel(cdns, dpn_hctrl_off_target, dpn_hctrl); 1615 1616 if (!override) 1617 dpn_samplectrl = t_params->sample_interval - 1; 1618 else 1619 dpn_samplectrl = cdns_readl(cdns, dpn_samplectrl_off_source); 1620 cdns_writel(cdns, dpn_samplectrl_off_target, dpn_samplectrl); 1621 1622 return 0; 1623 } 1624 1625 static int cdns_port_enable(struct sdw_bus *bus, 1626 struct sdw_enable_ch *enable_ch, unsigned int bank) 1627 { 1628 struct sdw_cdns *cdns = bus_to_cdns(bus); 1629 int dpn_chnen_off, ch_mask; 1630 1631 if (bank) 1632 dpn_chnen_off = CDNS_DPN_B1_CH_EN(enable_ch->port_num); 1633 else 1634 dpn_chnen_off = CDNS_DPN_B0_CH_EN(enable_ch->port_num); 1635 1636 ch_mask = enable_ch->ch_mask * enable_ch->enable; 1637 cdns_writel(cdns, dpn_chnen_off, ch_mask); 1638 1639 return 0; 1640 } 1641 1642 static const struct sdw_master_port_ops cdns_port_ops = { 1643 .dpn_set_port_params = cdns_port_params, 1644 .dpn_set_port_transport_params = cdns_transport_params, 1645 .dpn_port_enable_ch = cdns_port_enable, 1646 }; 1647 1648 /** 1649 * sdw_cdns_is_clock_stop: Check clock status 1650 * 1651 * @cdns: Cadence instance 1652 */ 1653 bool sdw_cdns_is_clock_stop(struct sdw_cdns *cdns) 1654 { 1655 return !!(cdns_readl(cdns, CDNS_MCP_STAT) & CDNS_MCP_STAT_CLK_STOP); 1656 } 1657 EXPORT_SYMBOL(sdw_cdns_is_clock_stop); 1658 1659 /** 1660 * sdw_cdns_clock_stop: Cadence clock stop configuration routine 1661 * 1662 * @cdns: Cadence instance 1663 * @block_wake: prevent wakes if required by the platform 1664 */ 1665 int sdw_cdns_clock_stop(struct sdw_cdns *cdns, bool block_wake) 1666 { 1667 bool slave_present = false; 1668 struct sdw_slave *slave; 1669 int ret; 1670 1671 sdw_cdns_check_self_clearing_bits(cdns, __func__, false, 0); 1672 1673 /* Check suspend status */ 1674 if (sdw_cdns_is_clock_stop(cdns)) { 1675 dev_dbg(cdns->dev, "Clock is already stopped\n"); 1676 return 0; 1677 } 1678 1679 /* 1680 * Before entering clock stop we mask the Slave 1681 * interrupts. This helps avoid having to deal with e.g. a 1682 * Slave becoming UNATTACHED while the clock is being stopped 1683 */ 1684 cdns_enable_slave_interrupts(cdns, false); 1685 1686 /* 1687 * For specific platforms, it is required to be able to put 1688 * master into a state in which it ignores wake-up trials 1689 * in clock stop state 1690 */ 1691 if (block_wake) 1692 cdns_ip_updatel(cdns, CDNS_IP_MCP_CONTROL, 1693 CDNS_IP_MCP_CONTROL_BLOCK_WAKEUP, 1694 CDNS_IP_MCP_CONTROL_BLOCK_WAKEUP); 1695 1696 list_for_each_entry(slave, &cdns->bus.slaves, node) { 1697 if (slave->status == SDW_SLAVE_ATTACHED || 1698 slave->status == SDW_SLAVE_ALERT) { 1699 slave_present = true; 1700 break; 1701 } 1702 } 1703 1704 /* commit changes */ 1705 ret = cdns_config_update(cdns); 1706 if (ret < 0) { 1707 dev_err(cdns->dev, "%s: config_update failed\n", __func__); 1708 return ret; 1709 } 1710 1711 /* Prepare slaves for clock stop */ 1712 if (slave_present) { 1713 ret = sdw_bus_prep_clk_stop(&cdns->bus); 1714 if (ret < 0 && ret != -ENODATA) { 1715 dev_err(cdns->dev, "prepare clock stop failed %d\n", ret); 1716 return ret; 1717 } 1718 } 1719 1720 /* 1721 * Enter clock stop mode and only report errors if there are 1722 * Slave devices present (ALERT or ATTACHED) 1723 */ 1724 ret = sdw_bus_clk_stop(&cdns->bus); 1725 if (ret < 0 && slave_present && ret != -ENODATA) { 1726 dev_err(cdns->dev, "bus clock stop failed %d\n", ret); 1727 return ret; 1728 } 1729 1730 ret = cdns_set_wait(cdns, CDNS_MCP_STAT, 1731 CDNS_MCP_STAT_CLK_STOP, 1732 CDNS_MCP_STAT_CLK_STOP); 1733 if (ret < 0) 1734 dev_err(cdns->dev, "Clock stop failed %d\n", ret); 1735 1736 return ret; 1737 } 1738 EXPORT_SYMBOL(sdw_cdns_clock_stop); 1739 1740 /** 1741 * sdw_cdns_clock_restart: Cadence PM clock restart configuration routine 1742 * 1743 * @cdns: Cadence instance 1744 * @bus_reset: context may be lost while in low power modes and the bus 1745 * may require a Severe Reset and re-enumeration after a wake. 1746 */ 1747 int sdw_cdns_clock_restart(struct sdw_cdns *cdns, bool bus_reset) 1748 { 1749 int ret; 1750 1751 /* unmask Slave interrupts that were masked when stopping the clock */ 1752 cdns_enable_slave_interrupts(cdns, true); 1753 1754 ret = cdns_clear_bit(cdns, CDNS_MCP_CONTROL, 1755 CDNS_MCP_CONTROL_CLK_STOP_CLR); 1756 if (ret < 0) { 1757 dev_err(cdns->dev, "Couldn't exit from clock stop\n"); 1758 return ret; 1759 } 1760 1761 ret = cdns_set_wait(cdns, CDNS_MCP_STAT, CDNS_MCP_STAT_CLK_STOP, 0); 1762 if (ret < 0) { 1763 dev_err(cdns->dev, "clock stop exit failed %d\n", ret); 1764 return ret; 1765 } 1766 1767 cdns_ip_updatel(cdns, CDNS_IP_MCP_CONTROL, 1768 CDNS_IP_MCP_CONTROL_BLOCK_WAKEUP, 0); 1769 1770 cdns_ip_updatel(cdns, CDNS_IP_MCP_CONTROL, CDNS_IP_MCP_CONTROL_CMD_ACCEPT, 1771 CDNS_IP_MCP_CONTROL_CMD_ACCEPT); 1772 1773 if (!bus_reset) { 1774 1775 /* enable bus operations with clock and data */ 1776 cdns_ip_updatel(cdns, CDNS_IP_MCP_CONFIG, 1777 CDNS_IP_MCP_CONFIG_OP, 1778 CDNS_IP_MCP_CONFIG_OP_NORMAL); 1779 1780 ret = cdns_config_update(cdns); 1781 if (ret < 0) { 1782 dev_err(cdns->dev, "%s: config_update failed\n", __func__); 1783 return ret; 1784 } 1785 1786 ret = sdw_bus_exit_clk_stop(&cdns->bus); 1787 if (ret < 0) 1788 dev_err(cdns->dev, "bus failed to exit clock stop %d\n", ret); 1789 } 1790 1791 return ret; 1792 } 1793 EXPORT_SYMBOL(sdw_cdns_clock_restart); 1794 1795 /** 1796 * sdw_cdns_probe() - Cadence probe routine 1797 * @cdns: Cadence instance 1798 */ 1799 int sdw_cdns_probe(struct sdw_cdns *cdns) 1800 { 1801 init_completion(&cdns->tx_complete); 1802 cdns->bus.port_ops = &cdns_port_ops; 1803 1804 mutex_init(&cdns->status_update_lock); 1805 1806 INIT_WORK(&cdns->work, cdns_update_slave_status_work); 1807 INIT_DELAYED_WORK(&cdns->attach_dwork, cdns_check_attached_status_dwork); 1808 1809 return 0; 1810 } 1811 EXPORT_SYMBOL(sdw_cdns_probe); 1812 1813 int cdns_set_sdw_stream(struct snd_soc_dai *dai, 1814 void *stream, int direction) 1815 { 1816 struct sdw_cdns *cdns = snd_soc_dai_get_drvdata(dai); 1817 struct sdw_cdns_dai_runtime *dai_runtime; 1818 1819 dai_runtime = cdns->dai_runtime_array[dai->id]; 1820 1821 if (stream) { 1822 /* first paranoia check */ 1823 if (dai_runtime) { 1824 dev_err(dai->dev, 1825 "dai_runtime already allocated for dai %s\n", 1826 dai->name); 1827 return -EINVAL; 1828 } 1829 1830 /* allocate and set dai_runtime info */ 1831 dai_runtime = kzalloc(sizeof(*dai_runtime), GFP_KERNEL); 1832 if (!dai_runtime) 1833 return -ENOMEM; 1834 1835 dai_runtime->stream_type = SDW_STREAM_PCM; 1836 1837 dai_runtime->bus = &cdns->bus; 1838 dai_runtime->link_id = cdns->instance; 1839 1840 dai_runtime->stream = stream; 1841 dai_runtime->direction = direction; 1842 1843 cdns->dai_runtime_array[dai->id] = dai_runtime; 1844 } else { 1845 /* second paranoia check */ 1846 if (!dai_runtime) { 1847 dev_err(dai->dev, 1848 "dai_runtime not allocated for dai %s\n", 1849 dai->name); 1850 return -EINVAL; 1851 } 1852 1853 /* for NULL stream we release allocated dai_runtime */ 1854 kfree(dai_runtime); 1855 cdns->dai_runtime_array[dai->id] = NULL; 1856 } 1857 return 0; 1858 } 1859 EXPORT_SYMBOL(cdns_set_sdw_stream); 1860 1861 /** 1862 * cdns_find_pdi() - Find a free PDI 1863 * 1864 * @cdns: Cadence instance 1865 * @num: Number of PDIs 1866 * @pdi: PDI instances 1867 * @dai_id: DAI id 1868 * 1869 * Find a PDI for a given PDI array. The PDI num and dai_id are 1870 * expected to match, return NULL otherwise. 1871 */ 1872 static struct sdw_cdns_pdi *cdns_find_pdi(struct sdw_cdns *cdns, 1873 unsigned int num, 1874 struct sdw_cdns_pdi *pdi, 1875 int dai_id) 1876 { 1877 int i; 1878 1879 for (i = 0; i < num; i++) 1880 if (pdi[i].num == dai_id) 1881 return &pdi[i]; 1882 1883 return NULL; 1884 } 1885 1886 /** 1887 * sdw_cdns_config_stream: Configure a stream 1888 * 1889 * @cdns: Cadence instance 1890 * @ch: Channel count 1891 * @dir: Data direction 1892 * @pdi: PDI to be used 1893 */ 1894 void sdw_cdns_config_stream(struct sdw_cdns *cdns, 1895 u32 ch, u32 dir, struct sdw_cdns_pdi *pdi) 1896 { 1897 u32 offset, val = 0; 1898 1899 if (dir == SDW_DATA_DIR_RX) { 1900 val = CDNS_PORTCTRL_DIRN; 1901 1902 if (cdns->bus.params.m_data_mode != SDW_PORT_DATA_MODE_NORMAL) 1903 val |= CDNS_PORTCTRL_TEST_FAILED; 1904 } 1905 offset = CDNS_PORTCTRL + pdi->num * CDNS_PORT_OFFSET; 1906 cdns_updatel(cdns, offset, 1907 CDNS_PORTCTRL_DIRN | CDNS_PORTCTRL_TEST_FAILED, 1908 val); 1909 1910 val = pdi->num; 1911 val |= CDNS_PDI_CONFIG_SOFT_RESET; 1912 val |= FIELD_PREP(CDNS_PDI_CONFIG_CHANNEL, (1 << ch) - 1); 1913 cdns_writel(cdns, CDNS_PDI_CONFIG(pdi->num), val); 1914 } 1915 EXPORT_SYMBOL(sdw_cdns_config_stream); 1916 1917 /** 1918 * sdw_cdns_alloc_pdi() - Allocate a PDI 1919 * 1920 * @cdns: Cadence instance 1921 * @stream: Stream to be allocated 1922 * @ch: Channel count 1923 * @dir: Data direction 1924 * @dai_id: DAI id 1925 */ 1926 struct sdw_cdns_pdi *sdw_cdns_alloc_pdi(struct sdw_cdns *cdns, 1927 struct sdw_cdns_streams *stream, 1928 u32 ch, u32 dir, int dai_id) 1929 { 1930 struct sdw_cdns_pdi *pdi = NULL; 1931 1932 if (dir == SDW_DATA_DIR_RX) 1933 pdi = cdns_find_pdi(cdns, stream->num_in, stream->in, 1934 dai_id); 1935 else 1936 pdi = cdns_find_pdi(cdns, stream->num_out, stream->out, 1937 dai_id); 1938 1939 /* check if we found a PDI, else find in bi-directional */ 1940 if (!pdi) 1941 pdi = cdns_find_pdi(cdns, stream->num_bd, stream->bd, 1942 dai_id); 1943 1944 if (pdi) { 1945 pdi->l_ch_num = 0; 1946 pdi->h_ch_num = ch - 1; 1947 pdi->dir = dir; 1948 pdi->ch_count = ch; 1949 } 1950 1951 return pdi; 1952 } 1953 EXPORT_SYMBOL(sdw_cdns_alloc_pdi); 1954 1955 MODULE_LICENSE("Dual BSD/GPL"); 1956 MODULE_DESCRIPTION("Cadence Soundwire Library"); 1957