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 #define CDNS_PORTCTRL_BULK_ENABLE BIT(16) 188 189 #define CDNS_PORT_OFFSET 0x80 190 191 #define CDNS_PDI_CONFIG(n) (0x1100 + (n) * 16) 192 193 #define CDNS_PDI_CONFIG_SOFT_RESET BIT(24) 194 #define CDNS_PDI_CONFIG_CHANNEL GENMASK(15, 8) 195 #define CDNS_PDI_CONFIG_PORT GENMASK(4, 0) 196 197 /* Driver defaults */ 198 #define CDNS_TX_TIMEOUT 500 199 200 #define CDNS_SCP_RX_FIFOLEVEL 0x2 201 202 /* 203 * register accessor helpers 204 */ 205 static inline u32 cdns_readl(struct sdw_cdns *cdns, int offset) 206 { 207 return readl(cdns->registers + offset); 208 } 209 210 static inline void cdns_writel(struct sdw_cdns *cdns, int offset, u32 value) 211 { 212 writel(value, cdns->registers + offset); 213 } 214 215 static inline u32 cdns_ip_readl(struct sdw_cdns *cdns, int offset) 216 { 217 return cdns_readl(cdns, cdns->ip_offset + offset); 218 } 219 220 static inline void cdns_ip_writel(struct sdw_cdns *cdns, int offset, u32 value) 221 { 222 return cdns_writel(cdns, cdns->ip_offset + offset, value); 223 } 224 225 static inline void cdns_updatel(struct sdw_cdns *cdns, 226 int offset, u32 mask, u32 val) 227 { 228 u32 tmp; 229 230 tmp = cdns_readl(cdns, offset); 231 tmp = (tmp & ~mask) | val; 232 cdns_writel(cdns, offset, tmp); 233 } 234 235 static inline void cdns_ip_updatel(struct sdw_cdns *cdns, 236 int offset, u32 mask, u32 val) 237 { 238 cdns_updatel(cdns, cdns->ip_offset + offset, mask, val); 239 } 240 241 static int cdns_set_wait(struct sdw_cdns *cdns, int offset, u32 mask, u32 value) 242 { 243 int timeout = 10; 244 u32 reg_read; 245 246 /* Wait for bit to be set */ 247 do { 248 reg_read = readl(cdns->registers + offset); 249 if ((reg_read & mask) == value) 250 return 0; 251 252 timeout--; 253 usleep_range(50, 100); 254 } while (timeout != 0); 255 256 return -ETIMEDOUT; 257 } 258 259 static int cdns_clear_bit(struct sdw_cdns *cdns, int offset, u32 value) 260 { 261 writel(value, cdns->registers + offset); 262 263 /* Wait for bit to be self cleared */ 264 return cdns_set_wait(cdns, offset, value, 0); 265 } 266 267 /* 268 * all changes to the MCP_CONFIG, MCP_CONTROL, MCP_CMDCTRL and MCP_PHYCTRL 269 * need to be confirmed with a write to MCP_CONFIG_UPDATE 270 */ 271 static int cdns_config_update(struct sdw_cdns *cdns) 272 { 273 int ret; 274 275 if (sdw_cdns_is_clock_stop(cdns)) { 276 dev_err(cdns->dev, "Cannot program MCP_CONFIG_UPDATE in ClockStopMode\n"); 277 return -EINVAL; 278 } 279 280 ret = cdns_clear_bit(cdns, CDNS_MCP_CONFIG_UPDATE, 281 CDNS_MCP_CONFIG_UPDATE_BIT); 282 if (ret < 0) 283 dev_err(cdns->dev, "Config update timedout\n"); 284 285 return ret; 286 } 287 288 /** 289 * sdw_cdns_config_update() - Update configurations 290 * @cdns: Cadence instance 291 */ 292 void sdw_cdns_config_update(struct sdw_cdns *cdns) 293 { 294 /* commit changes */ 295 cdns_writel(cdns, CDNS_MCP_CONFIG_UPDATE, CDNS_MCP_CONFIG_UPDATE_BIT); 296 } 297 EXPORT_SYMBOL(sdw_cdns_config_update); 298 299 /** 300 * sdw_cdns_config_update_set_wait() - wait until configuration update bit is self-cleared 301 * @cdns: Cadence instance 302 */ 303 int sdw_cdns_config_update_set_wait(struct sdw_cdns *cdns) 304 { 305 /* the hardware recommendation is to wait at least 300us */ 306 return cdns_set_wait(cdns, CDNS_MCP_CONFIG_UPDATE, 307 CDNS_MCP_CONFIG_UPDATE_BIT, 0); 308 } 309 EXPORT_SYMBOL(sdw_cdns_config_update_set_wait); 310 311 /* 312 * debugfs 313 */ 314 #ifdef CONFIG_DEBUG_FS 315 316 #define RD_BUF (2 * PAGE_SIZE) 317 318 static ssize_t cdns_sprintf(struct sdw_cdns *cdns, 319 char *buf, size_t pos, unsigned int reg) 320 { 321 return scnprintf(buf + pos, RD_BUF - pos, 322 "%4x\t%8x\n", reg, cdns_readl(cdns, reg)); 323 } 324 325 static int cdns_reg_show(struct seq_file *s, void *data) 326 { 327 struct sdw_cdns *cdns = s->private; 328 ssize_t ret; 329 int num_ports; 330 int i, j; 331 332 char *buf __free(kfree) = kzalloc(RD_BUF, GFP_KERNEL); 333 if (!buf) 334 return -ENOMEM; 335 336 ret = scnprintf(buf, RD_BUF, "Register Value\n"); 337 ret += scnprintf(buf + ret, RD_BUF - ret, "\nMCP Registers\n"); 338 /* 8 MCP registers */ 339 for (i = CDNS_MCP_CONFIG; i <= CDNS_MCP_PHYCTRL; i += sizeof(u32)) 340 ret += cdns_sprintf(cdns, buf, ret, i); 341 342 ret += scnprintf(buf + ret, RD_BUF - ret, 343 "\nStatus & Intr Registers\n"); 344 /* 13 Status & Intr registers (offsets 0x70 and 0x74 not defined) */ 345 for (i = CDNS_MCP_STAT; i <= CDNS_MCP_FIFOSTAT; i += sizeof(u32)) 346 ret += cdns_sprintf(cdns, buf, ret, i); 347 348 ret += scnprintf(buf + ret, RD_BUF - ret, 349 "\nSSP & Clk ctrl Registers\n"); 350 ret += cdns_sprintf(cdns, buf, ret, CDNS_MCP_SSP_CTRL0); 351 ret += cdns_sprintf(cdns, buf, ret, CDNS_MCP_SSP_CTRL1); 352 ret += cdns_sprintf(cdns, buf, ret, CDNS_MCP_CLK_CTRL0); 353 ret += cdns_sprintf(cdns, buf, ret, CDNS_MCP_CLK_CTRL1); 354 355 ret += scnprintf(buf + ret, RD_BUF - ret, 356 "\nDPn B0 Registers\n"); 357 358 num_ports = cdns->num_ports; 359 360 for (i = 0; i < num_ports; i++) { 361 ret += scnprintf(buf + ret, RD_BUF - ret, 362 "\nDP-%d\n", i); 363 for (j = CDNS_DPN_B0_CONFIG(i); 364 j < CDNS_DPN_B0_ASYNC_CTRL(i); j += sizeof(u32)) 365 ret += cdns_sprintf(cdns, buf, ret, j); 366 } 367 368 ret += scnprintf(buf + ret, RD_BUF - ret, 369 "\nDPn B1 Registers\n"); 370 for (i = 0; i < num_ports; i++) { 371 ret += scnprintf(buf + ret, RD_BUF - ret, 372 "\nDP-%d\n", i); 373 374 for (j = CDNS_DPN_B1_CONFIG(i); 375 j < CDNS_DPN_B1_ASYNC_CTRL(i); j += sizeof(u32)) 376 ret += cdns_sprintf(cdns, buf, ret, j); 377 } 378 379 ret += scnprintf(buf + ret, RD_BUF - ret, 380 "\nDPn Control Registers\n"); 381 for (i = 0; i < num_ports; i++) 382 ret += cdns_sprintf(cdns, buf, ret, 383 CDNS_PORTCTRL + i * CDNS_PORT_OFFSET); 384 385 ret += scnprintf(buf + ret, RD_BUF - ret, 386 "\nPDIn Config Registers\n"); 387 388 /* number of PDI and ports is interchangeable */ 389 for (i = 0; i < num_ports; i++) 390 ret += cdns_sprintf(cdns, buf, ret, CDNS_PDI_CONFIG(i)); 391 392 seq_printf(s, "%s", 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 ret = cdns_clear_bit(cdns, CDNS_MCP_CONFIG_UPDATE, CDNS_MCP_CONFIG_UPDATE_BIT); 460 if (ret < 0) 461 goto unlock; 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 ret = cdns_clear_bit(cdns, CDNS_MCP_CONFIG_UPDATE, CDNS_MCP_CONFIG_UPDATE_BIT); 474 if (ret < 0) 475 goto unlock; 476 477 /* Userspace changed the hardware state behind the kernel's back */ 478 add_taint(TAINT_USER, LOCKDEP_STILL_OK); 479 480 unlock: 481 /* Continue bus operation with parity error injection disabled */ 482 mutex_unlock(&bus->bus_lock); 483 484 /* 485 * allow Master device to enter pm_runtime suspend. This may 486 * also result in Slave devices suspending. 487 */ 488 pm_runtime_mark_last_busy(bus->dev); 489 pm_runtime_put_autosuspend(bus->dev); 490 491 return 0; 492 } 493 494 DEFINE_DEBUGFS_ATTRIBUTE(cdns_parity_error_fops, NULL, 495 cdns_parity_error_injection, "%llu\n"); 496 497 static int cdns_set_pdi_loopback_source(void *data, u64 value) 498 { 499 struct sdw_cdns *cdns = data; 500 unsigned int pdi_out_num = cdns->pcm.num_bd + cdns->pcm.num_out; 501 502 if (value > pdi_out_num) 503 return -EINVAL; 504 505 /* Userspace changed the hardware state behind the kernel's back */ 506 add_taint(TAINT_USER, LOCKDEP_STILL_OK); 507 508 cdns->pdi_loopback_source = value; 509 510 return 0; 511 } 512 DEFINE_DEBUGFS_ATTRIBUTE(cdns_pdi_loopback_source_fops, NULL, cdns_set_pdi_loopback_source, "%llu\n"); 513 514 static int cdns_set_pdi_loopback_target(void *data, u64 value) 515 { 516 struct sdw_cdns *cdns = data; 517 unsigned int pdi_in_num = cdns->pcm.num_bd + cdns->pcm.num_in; 518 519 if (value > pdi_in_num) 520 return -EINVAL; 521 522 /* Userspace changed the hardware state behind the kernel's back */ 523 add_taint(TAINT_USER, LOCKDEP_STILL_OK); 524 525 cdns->pdi_loopback_target = value; 526 527 return 0; 528 } 529 DEFINE_DEBUGFS_ATTRIBUTE(cdns_pdi_loopback_target_fops, NULL, cdns_set_pdi_loopback_target, "%llu\n"); 530 531 /** 532 * sdw_cdns_debugfs_init() - Cadence debugfs init 533 * @cdns: Cadence instance 534 * @root: debugfs root 535 */ 536 void sdw_cdns_debugfs_init(struct sdw_cdns *cdns, struct dentry *root) 537 { 538 debugfs_create_file("cdns-registers", 0400, root, cdns, &cdns_reg_fops); 539 540 debugfs_create_file("cdns-hw-reset", 0200, root, cdns, 541 &cdns_hw_reset_fops); 542 543 debugfs_create_file("cdns-parity-error-injection", 0200, root, cdns, 544 &cdns_parity_error_fops); 545 546 cdns->pdi_loopback_source = -1; 547 cdns->pdi_loopback_target = -1; 548 549 debugfs_create_file("cdns-pdi-loopback-source", 0200, root, cdns, 550 &cdns_pdi_loopback_source_fops); 551 552 debugfs_create_file("cdns-pdi-loopback-target", 0200, root, cdns, 553 &cdns_pdi_loopback_target_fops); 554 555 } 556 EXPORT_SYMBOL_GPL(sdw_cdns_debugfs_init); 557 558 #endif /* CONFIG_DEBUG_FS */ 559 560 /* 561 * IO Calls 562 */ 563 static enum sdw_command_response 564 cdns_fill_msg_resp(struct sdw_cdns *cdns, 565 struct sdw_msg *msg, int count, int offset) 566 { 567 int nack = 0, no_ack = 0; 568 int i; 569 570 /* check message response */ 571 for (i = 0; i < count; i++) { 572 if (!(cdns->response_buf[i] & CDNS_MCP_RESP_ACK)) { 573 no_ack = 1; 574 dev_vdbg(cdns->dev, "Msg Ack not received, cmd %d\n", i); 575 } 576 if (cdns->response_buf[i] & CDNS_MCP_RESP_NACK) { 577 nack = 1; 578 dev_err_ratelimited(cdns->dev, "Msg NACK received, cmd %d\n", i); 579 } 580 } 581 582 if (nack) { 583 dev_err_ratelimited(cdns->dev, "Msg NACKed for Slave %d\n", msg->dev_num); 584 return SDW_CMD_FAIL; 585 } 586 587 if (no_ack) { 588 dev_dbg_ratelimited(cdns->dev, "Msg ignored for Slave %d\n", msg->dev_num); 589 return SDW_CMD_IGNORED; 590 } 591 592 if (msg->flags == SDW_MSG_FLAG_READ) { 593 /* fill response */ 594 for (i = 0; i < count; i++) 595 msg->buf[i + offset] = FIELD_GET(CDNS_MCP_RESP_RDATA, 596 cdns->response_buf[i]); 597 } 598 599 return SDW_CMD_OK; 600 } 601 602 static void cdns_read_response(struct sdw_cdns *cdns) 603 { 604 u32 num_resp, cmd_base; 605 int i; 606 607 /* RX_FIFO_AVAIL can be 2 entries more than the FIFO size */ 608 BUILD_BUG_ON(ARRAY_SIZE(cdns->response_buf) < CDNS_MCP_CMD_LEN + 2); 609 610 num_resp = cdns_readl(cdns, CDNS_MCP_FIFOSTAT); 611 num_resp &= CDNS_MCP_RX_FIFO_AVAIL; 612 if (num_resp > ARRAY_SIZE(cdns->response_buf)) { 613 dev_warn(cdns->dev, "RX AVAIL %d too long\n", num_resp); 614 num_resp = ARRAY_SIZE(cdns->response_buf); 615 } 616 617 cmd_base = CDNS_IP_MCP_CMD_BASE; 618 619 for (i = 0; i < num_resp; i++) { 620 cdns->response_buf[i] = cdns_ip_readl(cdns, cmd_base); 621 cmd_base += CDNS_MCP_CMD_WORD_LEN; 622 } 623 } 624 625 static enum sdw_command_response 626 _cdns_xfer_msg(struct sdw_cdns *cdns, struct sdw_msg *msg, int cmd, 627 int offset, int count, bool defer) 628 { 629 unsigned long time; 630 u32 base, i, data; 631 u16 addr; 632 633 /* Program the watermark level for RX FIFO */ 634 if (cdns->msg_count != count) { 635 cdns_writel(cdns, CDNS_MCP_FIFOLEVEL, count); 636 cdns->msg_count = count; 637 } 638 639 base = CDNS_IP_MCP_CMD_BASE; 640 addr = msg->addr + offset; 641 642 for (i = 0; i < count; i++) { 643 data = FIELD_PREP(CDNS_MCP_CMD_DEV_ADDR, msg->dev_num); 644 data |= FIELD_PREP(CDNS_MCP_CMD_COMMAND, cmd); 645 data |= FIELD_PREP(CDNS_MCP_CMD_REG_ADDR, addr); 646 addr++; 647 648 if (msg->flags == SDW_MSG_FLAG_WRITE) 649 data |= msg->buf[i + offset]; 650 651 data |= FIELD_PREP(CDNS_MCP_CMD_SSP_TAG, msg->ssp_sync); 652 cdns_ip_writel(cdns, base, data); 653 base += CDNS_MCP_CMD_WORD_LEN; 654 } 655 656 if (defer) 657 return SDW_CMD_OK; 658 659 /* wait for timeout or response */ 660 time = wait_for_completion_timeout(&cdns->tx_complete, 661 msecs_to_jiffies(CDNS_TX_TIMEOUT)); 662 if (!time) { 663 dev_err(cdns->dev, "IO transfer timed out, cmd %d device %d addr %x len %d\n", 664 cmd, msg->dev_num, msg->addr, msg->len); 665 msg->len = 0; 666 667 /* Drain anything in the RX_FIFO */ 668 cdns_read_response(cdns); 669 670 return SDW_CMD_TIMEOUT; 671 } 672 673 return cdns_fill_msg_resp(cdns, msg, count, offset); 674 } 675 676 static enum sdw_command_response 677 cdns_program_scp_addr(struct sdw_cdns *cdns, struct sdw_msg *msg) 678 { 679 int nack = 0, no_ack = 0; 680 unsigned long time; 681 u32 data[2], base; 682 int i; 683 684 /* Program the watermark level for RX FIFO */ 685 if (cdns->msg_count != CDNS_SCP_RX_FIFOLEVEL) { 686 cdns_writel(cdns, CDNS_MCP_FIFOLEVEL, CDNS_SCP_RX_FIFOLEVEL); 687 cdns->msg_count = CDNS_SCP_RX_FIFOLEVEL; 688 } 689 690 data[0] = FIELD_PREP(CDNS_MCP_CMD_DEV_ADDR, msg->dev_num); 691 data[0] |= FIELD_PREP(CDNS_MCP_CMD_COMMAND, 0x3); 692 data[1] = data[0]; 693 694 data[0] |= FIELD_PREP(CDNS_MCP_CMD_REG_ADDR, SDW_SCP_ADDRPAGE1); 695 data[1] |= FIELD_PREP(CDNS_MCP_CMD_REG_ADDR, SDW_SCP_ADDRPAGE2); 696 697 data[0] |= msg->addr_page1; 698 data[1] |= msg->addr_page2; 699 700 base = CDNS_IP_MCP_CMD_BASE; 701 cdns_ip_writel(cdns, base, data[0]); 702 base += CDNS_MCP_CMD_WORD_LEN; 703 cdns_ip_writel(cdns, base, data[1]); 704 705 time = wait_for_completion_timeout(&cdns->tx_complete, 706 msecs_to_jiffies(CDNS_TX_TIMEOUT)); 707 if (!time) { 708 dev_err(cdns->dev, "SCP Msg trf timed out\n"); 709 msg->len = 0; 710 return SDW_CMD_TIMEOUT; 711 } 712 713 /* check response the writes */ 714 for (i = 0; i < 2; i++) { 715 if (!(cdns->response_buf[i] & CDNS_MCP_RESP_ACK)) { 716 no_ack = 1; 717 dev_err(cdns->dev, "Program SCP Ack not received\n"); 718 if (cdns->response_buf[i] & CDNS_MCP_RESP_NACK) { 719 nack = 1; 720 dev_err(cdns->dev, "Program SCP NACK received\n"); 721 } 722 } 723 } 724 725 /* For NACK, NO ack, don't return err if we are in Broadcast mode */ 726 if (nack) { 727 dev_err_ratelimited(cdns->dev, 728 "SCP_addrpage NACKed for Slave %d\n", msg->dev_num); 729 return SDW_CMD_FAIL; 730 } 731 732 if (no_ack) { 733 dev_dbg_ratelimited(cdns->dev, 734 "SCP_addrpage ignored for Slave %d\n", msg->dev_num); 735 return SDW_CMD_IGNORED; 736 } 737 738 return SDW_CMD_OK; 739 } 740 741 static int cdns_prep_msg(struct sdw_cdns *cdns, struct sdw_msg *msg, int *cmd) 742 { 743 int ret; 744 745 if (msg->page) { 746 ret = cdns_program_scp_addr(cdns, msg); 747 if (ret) { 748 msg->len = 0; 749 return ret; 750 } 751 } 752 753 switch (msg->flags) { 754 case SDW_MSG_FLAG_READ: 755 *cmd = CDNS_MCP_CMD_READ; 756 break; 757 758 case SDW_MSG_FLAG_WRITE: 759 *cmd = CDNS_MCP_CMD_WRITE; 760 break; 761 762 default: 763 dev_err(cdns->dev, "Invalid msg cmd: %d\n", msg->flags); 764 return -EINVAL; 765 } 766 767 return 0; 768 } 769 770 enum sdw_command_response 771 cdns_xfer_msg(struct sdw_bus *bus, struct sdw_msg *msg) 772 { 773 struct sdw_cdns *cdns = bus_to_cdns(bus); 774 int cmd = 0, ret, i; 775 776 ret = cdns_prep_msg(cdns, msg, &cmd); 777 if (ret) 778 return SDW_CMD_FAIL_OTHER; 779 780 for (i = 0; i < msg->len / CDNS_MCP_CMD_LEN; i++) { 781 ret = _cdns_xfer_msg(cdns, msg, cmd, i * CDNS_MCP_CMD_LEN, 782 CDNS_MCP_CMD_LEN, false); 783 if (ret != SDW_CMD_OK) 784 return ret; 785 } 786 787 if (!(msg->len % CDNS_MCP_CMD_LEN)) 788 return SDW_CMD_OK; 789 790 return _cdns_xfer_msg(cdns, msg, cmd, i * CDNS_MCP_CMD_LEN, 791 msg->len % CDNS_MCP_CMD_LEN, false); 792 } 793 EXPORT_SYMBOL(cdns_xfer_msg); 794 795 enum sdw_command_response 796 cdns_xfer_msg_defer(struct sdw_bus *bus) 797 { 798 struct sdw_cdns *cdns = bus_to_cdns(bus); 799 struct sdw_defer *defer = &bus->defer_msg; 800 struct sdw_msg *msg = defer->msg; 801 int cmd = 0, ret; 802 803 /* for defer only 1 message is supported */ 804 if (msg->len > 1) 805 return -ENOTSUPP; 806 807 ret = cdns_prep_msg(cdns, msg, &cmd); 808 if (ret) 809 return SDW_CMD_FAIL_OTHER; 810 811 return _cdns_xfer_msg(cdns, msg, cmd, 0, msg->len, true); 812 } 813 EXPORT_SYMBOL(cdns_xfer_msg_defer); 814 815 u32 cdns_read_ping_status(struct sdw_bus *bus) 816 { 817 struct sdw_cdns *cdns = bus_to_cdns(bus); 818 819 return cdns_readl(cdns, CDNS_MCP_SLAVE_STAT); 820 } 821 EXPORT_SYMBOL(cdns_read_ping_status); 822 823 /* 824 * IRQ handling 825 */ 826 827 static int cdns_update_slave_status(struct sdw_cdns *cdns, 828 u64 slave_intstat) 829 { 830 enum sdw_slave_status status[SDW_MAX_DEVICES + 1]; 831 bool is_slave = false; 832 u32 mask; 833 u32 val; 834 int i, set_status; 835 836 memset(status, 0, sizeof(status)); 837 838 for (i = 0; i <= SDW_MAX_DEVICES; i++) { 839 mask = (slave_intstat >> (i * CDNS_MCP_SLAVE_STATUS_NUM)) & 840 CDNS_MCP_SLAVE_STATUS_BITS; 841 842 set_status = 0; 843 844 if (mask) { 845 is_slave = true; 846 847 if (mask & CDNS_MCP_SLAVE_INTSTAT_RESERVED) { 848 status[i] = SDW_SLAVE_RESERVED; 849 set_status++; 850 } 851 852 if (mask & CDNS_MCP_SLAVE_INTSTAT_ATTACHED) { 853 status[i] = SDW_SLAVE_ATTACHED; 854 set_status++; 855 } 856 857 if (mask & CDNS_MCP_SLAVE_INTSTAT_ALERT) { 858 status[i] = SDW_SLAVE_ALERT; 859 set_status++; 860 } 861 862 if (mask & CDNS_MCP_SLAVE_INTSTAT_NPRESENT) { 863 status[i] = SDW_SLAVE_UNATTACHED; 864 set_status++; 865 } 866 } 867 868 /* 869 * check that there was a single reported Slave status and when 870 * there is not use the latest status extracted from PING commands 871 */ 872 if (set_status != 1) { 873 val = cdns_readl(cdns, CDNS_MCP_SLAVE_STAT); 874 val >>= (i * 2); 875 876 switch (val & 0x3) { 877 case 0: 878 status[i] = SDW_SLAVE_UNATTACHED; 879 break; 880 case 1: 881 status[i] = SDW_SLAVE_ATTACHED; 882 break; 883 case 2: 884 status[i] = SDW_SLAVE_ALERT; 885 break; 886 case 3: 887 default: 888 status[i] = SDW_SLAVE_RESERVED; 889 break; 890 } 891 } 892 } 893 894 if (is_slave) { 895 int ret; 896 897 mutex_lock(&cdns->status_update_lock); 898 ret = sdw_handle_slave_status(&cdns->bus, status); 899 mutex_unlock(&cdns->status_update_lock); 900 return ret; 901 } 902 903 return 0; 904 } 905 906 /** 907 * sdw_cdns_irq() - Cadence interrupt handler 908 * @irq: irq number 909 * @dev_id: irq context 910 */ 911 irqreturn_t sdw_cdns_irq(int irq, void *dev_id) 912 { 913 struct sdw_cdns *cdns = dev_id; 914 u32 int_status; 915 916 /* Check if the link is up */ 917 if (!cdns->link_up) 918 return IRQ_NONE; 919 920 int_status = cdns_readl(cdns, CDNS_MCP_INTSTAT); 921 922 /* check for reserved values read as zero */ 923 if (int_status & CDNS_MCP_INT_RESERVED) 924 return IRQ_NONE; 925 926 if (!(int_status & CDNS_MCP_INT_IRQ)) 927 return IRQ_NONE; 928 929 if (int_status & CDNS_MCP_INT_RX_WL) { 930 struct sdw_bus *bus = &cdns->bus; 931 struct sdw_defer *defer = &bus->defer_msg; 932 933 cdns_read_response(cdns); 934 935 if (defer && defer->msg) { 936 cdns_fill_msg_resp(cdns, defer->msg, 937 defer->length, 0); 938 complete(&defer->complete); 939 } else { 940 complete(&cdns->tx_complete); 941 } 942 } 943 944 if (int_status & CDNS_MCP_INT_PARITY) { 945 /* Parity error detected by Master */ 946 dev_err_ratelimited(cdns->dev, "Parity error\n"); 947 } 948 949 if (int_status & CDNS_MCP_INT_CTRL_CLASH) { 950 /* Slave is driving bit slot during control word */ 951 dev_err_ratelimited(cdns->dev, "Bus clash for control word\n"); 952 } 953 954 if (int_status & CDNS_MCP_INT_DATA_CLASH) { 955 /* 956 * Multiple slaves trying to drive bit slot, or issue with 957 * ownership of data bits or Slave gone bonkers 958 */ 959 dev_err_ratelimited(cdns->dev, "Bus clash for data word\n"); 960 } 961 962 if (cdns->bus.params.m_data_mode != SDW_PORT_DATA_MODE_NORMAL && 963 int_status & CDNS_MCP_INT_DPINT) { 964 u32 port_intstat; 965 966 /* just log which ports report an error */ 967 port_intstat = cdns_readl(cdns, CDNS_MCP_PORT_INTSTAT); 968 dev_err_ratelimited(cdns->dev, "DP interrupt: PortIntStat %8x\n", 969 port_intstat); 970 971 /* clear status w/ write1 */ 972 cdns_writel(cdns, CDNS_MCP_PORT_INTSTAT, port_intstat); 973 } 974 975 if (int_status & CDNS_MCP_INT_SLAVE_MASK) { 976 /* Mask the Slave interrupt and wake thread */ 977 cdns_updatel(cdns, CDNS_MCP_INTMASK, 978 CDNS_MCP_INT_SLAVE_MASK, 0); 979 980 int_status &= ~CDNS_MCP_INT_SLAVE_MASK; 981 982 /* 983 * Deal with possible race condition between interrupt 984 * handling and disabling interrupts on suspend. 985 * 986 * If the master is in the process of disabling 987 * interrupts, don't schedule a workqueue 988 */ 989 if (cdns->interrupt_enabled) 990 schedule_work(&cdns->work); 991 } 992 993 cdns_writel(cdns, CDNS_MCP_INTSTAT, int_status); 994 return IRQ_HANDLED; 995 } 996 EXPORT_SYMBOL(sdw_cdns_irq); 997 998 static void cdns_check_attached_status_dwork(struct work_struct *work) 999 { 1000 struct sdw_cdns *cdns = 1001 container_of(work, struct sdw_cdns, attach_dwork.work); 1002 enum sdw_slave_status status[SDW_MAX_DEVICES + 1]; 1003 u32 val; 1004 int ret; 1005 int i; 1006 1007 val = cdns_readl(cdns, CDNS_MCP_SLAVE_STAT); 1008 1009 for (i = 0; i <= SDW_MAX_DEVICES; i++) { 1010 status[i] = val & 0x3; 1011 if (status[i]) 1012 dev_dbg(cdns->dev, "Peripheral %d status: %d\n", i, status[i]); 1013 val >>= 2; 1014 } 1015 1016 mutex_lock(&cdns->status_update_lock); 1017 ret = sdw_handle_slave_status(&cdns->bus, status); 1018 mutex_unlock(&cdns->status_update_lock); 1019 if (ret < 0) 1020 dev_err(cdns->dev, "%s: sdw_handle_slave_status failed: %d\n", __func__, ret); 1021 } 1022 1023 /** 1024 * cdns_update_slave_status_work - update slave status in a work since we will need to handle 1025 * other interrupts eg. CDNS_MCP_INT_RX_WL during the update slave 1026 * process. 1027 * @work: cdns worker thread 1028 */ 1029 static void cdns_update_slave_status_work(struct work_struct *work) 1030 { 1031 struct sdw_cdns *cdns = 1032 container_of(work, struct sdw_cdns, work); 1033 u32 slave0, slave1; 1034 u64 slave_intstat; 1035 u32 device0_status; 1036 int retry_count = 0; 1037 1038 /* 1039 * Clear main interrupt first so we don't lose any assertions 1040 * that happen during this function. 1041 */ 1042 cdns_writel(cdns, CDNS_MCP_INTSTAT, CDNS_MCP_INT_SLAVE_MASK); 1043 1044 slave0 = cdns_readl(cdns, CDNS_MCP_SLAVE_INTSTAT0); 1045 slave1 = cdns_readl(cdns, CDNS_MCP_SLAVE_INTSTAT1); 1046 1047 /* 1048 * Clear the bits before handling so we don't lose any 1049 * bits that re-assert. 1050 */ 1051 cdns_writel(cdns, CDNS_MCP_SLAVE_INTSTAT0, slave0); 1052 cdns_writel(cdns, CDNS_MCP_SLAVE_INTSTAT1, slave1); 1053 1054 /* combine the two status */ 1055 slave_intstat = ((u64)slave1 << 32) | slave0; 1056 1057 dev_dbg_ratelimited(cdns->dev, "Slave status change: 0x%llx\n", slave_intstat); 1058 1059 update_status: 1060 cdns_update_slave_status(cdns, slave_intstat); 1061 1062 /* 1063 * When there is more than one peripheral per link, it's 1064 * possible that a deviceB becomes attached after we deal with 1065 * the attachment of deviceA. Since the hardware does a 1066 * logical AND, the attachment of the second device does not 1067 * change the status seen by the driver. 1068 * 1069 * In that case, clearing the registers above would result in 1070 * the deviceB never being detected - until a change of status 1071 * is observed on the bus. 1072 * 1073 * To avoid this race condition, re-check if any device0 needs 1074 * attention with PING commands. There is no need to check for 1075 * ALERTS since they are not allowed until a non-zero 1076 * device_number is assigned. 1077 * 1078 * Do not clear the INTSTAT0/1. While looping to enumerate devices on 1079 * #0 there could be status changes on other devices - these must 1080 * be kept in the INTSTAT so they can be handled when all #0 devices 1081 * have been handled. 1082 */ 1083 1084 device0_status = cdns_readl(cdns, CDNS_MCP_SLAVE_STAT); 1085 device0_status &= 3; 1086 1087 if (device0_status == SDW_SLAVE_ATTACHED) { 1088 if (retry_count++ < SDW_MAX_DEVICES) { 1089 dev_dbg_ratelimited(cdns->dev, 1090 "Device0 detected after clearing status, iteration %d\n", 1091 retry_count); 1092 slave_intstat = CDNS_MCP_SLAVE_INTSTAT_ATTACHED; 1093 goto update_status; 1094 } else { 1095 dev_err_ratelimited(cdns->dev, 1096 "Device0 detected after %d iterations\n", 1097 retry_count); 1098 } 1099 } 1100 1101 /* unmask Slave interrupt now */ 1102 cdns_updatel(cdns, CDNS_MCP_INTMASK, 1103 CDNS_MCP_INT_SLAVE_MASK, CDNS_MCP_INT_SLAVE_MASK); 1104 1105 } 1106 1107 /* paranoia check to make sure self-cleared bits are indeed cleared */ 1108 void sdw_cdns_check_self_clearing_bits(struct sdw_cdns *cdns, const char *string, 1109 bool initial_delay, int reset_iterations) 1110 { 1111 u32 ip_mcp_control; 1112 u32 mcp_control; 1113 u32 mcp_config_update; 1114 int i; 1115 1116 if (initial_delay) 1117 usleep_range(1000, 1500); 1118 1119 ip_mcp_control = cdns_ip_readl(cdns, CDNS_IP_MCP_CONTROL); 1120 1121 /* the following bits should be cleared immediately */ 1122 if (ip_mcp_control & CDNS_IP_MCP_CONTROL_SW_RST) 1123 dev_err(cdns->dev, "%s failed: IP_MCP_CONTROL_SW_RST is not cleared\n", string); 1124 1125 mcp_control = cdns_readl(cdns, CDNS_MCP_CONTROL); 1126 1127 /* the following bits should be cleared immediately */ 1128 if (mcp_control & CDNS_MCP_CONTROL_CMD_RST) 1129 dev_err(cdns->dev, "%s failed: MCP_CONTROL_CMD_RST is not cleared\n", string); 1130 if (mcp_control & CDNS_MCP_CONTROL_SOFT_RST) 1131 dev_err(cdns->dev, "%s failed: MCP_CONTROL_SOFT_RST is not cleared\n", string); 1132 if (mcp_control & CDNS_MCP_CONTROL_CLK_STOP_CLR) 1133 dev_err(cdns->dev, "%s failed: MCP_CONTROL_CLK_STOP_CLR is not cleared\n", string); 1134 1135 mcp_config_update = cdns_readl(cdns, CDNS_MCP_CONFIG_UPDATE); 1136 if (mcp_config_update & CDNS_MCP_CONFIG_UPDATE_BIT) 1137 dev_err(cdns->dev, "%s failed: MCP_CONFIG_UPDATE_BIT is not cleared\n", string); 1138 1139 i = 0; 1140 while (mcp_control & CDNS_MCP_CONTROL_HW_RST) { 1141 if (i == reset_iterations) { 1142 dev_err(cdns->dev, "%s failed: MCP_CONTROL_HW_RST is not cleared\n", string); 1143 break; 1144 } 1145 1146 dev_dbg(cdns->dev, "%s: MCP_CONTROL_HW_RST is not cleared at iteration %d\n", string, i); 1147 i++; 1148 1149 usleep_range(1000, 1500); 1150 mcp_control = cdns_readl(cdns, CDNS_MCP_CONTROL); 1151 } 1152 1153 } 1154 EXPORT_SYMBOL(sdw_cdns_check_self_clearing_bits); 1155 1156 /* 1157 * init routines 1158 */ 1159 1160 /** 1161 * sdw_cdns_exit_reset() - Program reset parameters and start bus operations 1162 * @cdns: Cadence instance 1163 */ 1164 int sdw_cdns_exit_reset(struct sdw_cdns *cdns) 1165 { 1166 /* keep reset delay unchanged to 4096 cycles */ 1167 1168 /* use hardware generated reset */ 1169 cdns_updatel(cdns, CDNS_MCP_CONTROL, 1170 CDNS_MCP_CONTROL_HW_RST, 1171 CDNS_MCP_CONTROL_HW_RST); 1172 1173 /* commit changes */ 1174 return cdns_config_update(cdns); 1175 } 1176 EXPORT_SYMBOL(sdw_cdns_exit_reset); 1177 1178 /** 1179 * cdns_enable_slave_interrupts() - Enable SDW slave interrupts 1180 * @cdns: Cadence instance 1181 * @state: boolean for true/false 1182 */ 1183 static void cdns_enable_slave_interrupts(struct sdw_cdns *cdns, bool state) 1184 { 1185 u32 mask; 1186 1187 mask = cdns_readl(cdns, CDNS_MCP_INTMASK); 1188 if (state) 1189 mask |= CDNS_MCP_INT_SLAVE_MASK; 1190 else 1191 mask &= ~CDNS_MCP_INT_SLAVE_MASK; 1192 1193 cdns_writel(cdns, CDNS_MCP_INTMASK, mask); 1194 } 1195 1196 /** 1197 * sdw_cdns_enable_interrupt() - Enable SDW interrupts 1198 * @cdns: Cadence instance 1199 * @state: True if we are trying to enable interrupt. 1200 */ 1201 int sdw_cdns_enable_interrupt(struct sdw_cdns *cdns, bool state) 1202 { 1203 u32 slave_intmask0 = 0; 1204 u32 slave_intmask1 = 0; 1205 u32 mask = 0; 1206 1207 if (!state) 1208 goto update_masks; 1209 1210 slave_intmask0 = CDNS_MCP_SLAVE_INTMASK0_MASK; 1211 slave_intmask1 = CDNS_MCP_SLAVE_INTMASK1_MASK; 1212 1213 /* enable detection of all slave state changes */ 1214 mask = CDNS_MCP_INT_SLAVE_MASK; 1215 1216 /* enable detection of bus issues */ 1217 mask |= CDNS_MCP_INT_CTRL_CLASH | CDNS_MCP_INT_DATA_CLASH | 1218 CDNS_MCP_INT_PARITY; 1219 1220 /* port interrupt limited to test modes for now */ 1221 if (cdns->bus.params.m_data_mode != SDW_PORT_DATA_MODE_NORMAL) 1222 mask |= CDNS_MCP_INT_DPINT; 1223 1224 /* enable detection of RX fifo level */ 1225 mask |= CDNS_MCP_INT_RX_WL; 1226 1227 /* 1228 * CDNS_MCP_INT_IRQ needs to be set otherwise all previous 1229 * settings are irrelevant 1230 */ 1231 mask |= CDNS_MCP_INT_IRQ; 1232 1233 if (interrupt_mask) /* parameter override */ 1234 mask = interrupt_mask; 1235 1236 update_masks: 1237 /* clear slave interrupt status before enabling interrupt */ 1238 if (state) { 1239 u32 slave_state; 1240 1241 slave_state = cdns_readl(cdns, CDNS_MCP_SLAVE_INTSTAT0); 1242 cdns_writel(cdns, CDNS_MCP_SLAVE_INTSTAT0, slave_state); 1243 slave_state = cdns_readl(cdns, CDNS_MCP_SLAVE_INTSTAT1); 1244 cdns_writel(cdns, CDNS_MCP_SLAVE_INTSTAT1, slave_state); 1245 } 1246 cdns->interrupt_enabled = state; 1247 1248 /* 1249 * Complete any on-going status updates before updating masks, 1250 * and cancel queued status updates. 1251 * 1252 * There could be a race with a new interrupt thrown before 1253 * the 3 mask updates below are complete, so in the interrupt 1254 * we use the 'interrupt_enabled' status to prevent new work 1255 * from being queued. 1256 */ 1257 if (!state) 1258 cancel_work_sync(&cdns->work); 1259 1260 cdns_writel(cdns, CDNS_MCP_SLAVE_INTMASK0, slave_intmask0); 1261 cdns_writel(cdns, CDNS_MCP_SLAVE_INTMASK1, slave_intmask1); 1262 cdns_writel(cdns, CDNS_MCP_INTMASK, mask); 1263 1264 return 0; 1265 } 1266 EXPORT_SYMBOL(sdw_cdns_enable_interrupt); 1267 1268 static int cdns_allocate_pdi(struct sdw_cdns *cdns, 1269 struct sdw_cdns_pdi **stream, 1270 u32 num) 1271 { 1272 struct sdw_cdns_pdi *pdi; 1273 int i; 1274 1275 if (!num) 1276 return 0; 1277 1278 pdi = devm_kcalloc(cdns->dev, num, sizeof(*pdi), GFP_KERNEL); 1279 if (!pdi) 1280 return -ENOMEM; 1281 1282 for (i = 0; i < num; i++) { 1283 pdi[i].num = i; 1284 } 1285 1286 *stream = pdi; 1287 return 0; 1288 } 1289 1290 /** 1291 * sdw_cdns_pdi_init() - PDI initialization routine 1292 * 1293 * @cdns: Cadence instance 1294 * @config: Stream configurations 1295 */ 1296 int sdw_cdns_pdi_init(struct sdw_cdns *cdns, 1297 struct sdw_cdns_stream_config config) 1298 { 1299 struct sdw_cdns_streams *stream; 1300 int ret; 1301 1302 cdns->pcm.num_bd = config.pcm_bd; 1303 cdns->pcm.num_in = config.pcm_in; 1304 cdns->pcm.num_out = config.pcm_out; 1305 1306 /* Allocate PDIs for PCMs */ 1307 stream = &cdns->pcm; 1308 1309 /* we allocate PDI0 and PDI1 which are used for Bulk */ 1310 ret = cdns_allocate_pdi(cdns, &stream->bd, stream->num_bd); 1311 if (ret) 1312 return ret; 1313 1314 ret = cdns_allocate_pdi(cdns, &stream->in, stream->num_in); 1315 if (ret) 1316 return ret; 1317 1318 ret = cdns_allocate_pdi(cdns, &stream->out, stream->num_out); 1319 if (ret) 1320 return ret; 1321 1322 /* Update total number of PCM PDIs */ 1323 stream->num_pdi = stream->num_bd + stream->num_in + stream->num_out; 1324 cdns->num_ports = stream->num_pdi; 1325 1326 return 0; 1327 } 1328 EXPORT_SYMBOL(sdw_cdns_pdi_init); 1329 1330 static u32 cdns_set_initial_frame_shape(int n_rows, int n_cols) 1331 { 1332 u32 val; 1333 int c; 1334 int r; 1335 1336 r = sdw_find_row_index(n_rows); 1337 c = sdw_find_col_index(n_cols); 1338 1339 val = FIELD_PREP(CDNS_MCP_FRAME_SHAPE_ROW_MASK, r); 1340 val |= FIELD_PREP(CDNS_MCP_FRAME_SHAPE_COL_MASK, c); 1341 1342 return val; 1343 } 1344 1345 static int cdns_init_clock_ctrl(struct sdw_cdns *cdns) 1346 { 1347 struct sdw_bus *bus = &cdns->bus; 1348 struct sdw_master_prop *prop = &bus->prop; 1349 u32 val; 1350 u32 ssp_interval; 1351 int divider; 1352 1353 dev_dbg(cdns->dev, "mclk %d max %d row %d col %d\n", 1354 prop->mclk_freq, 1355 prop->max_clk_freq, 1356 prop->default_row, 1357 prop->default_col); 1358 1359 if (!prop->default_frame_rate || !prop->default_row) { 1360 dev_err(cdns->dev, "Default frame_rate %d or row %d is invalid\n", 1361 prop->default_frame_rate, prop->default_row); 1362 return -EINVAL; 1363 } 1364 1365 /* Set clock divider */ 1366 divider = (prop->mclk_freq * SDW_DOUBLE_RATE_FACTOR / 1367 bus->params.curr_dr_freq) - 1; 1368 1369 cdns_updatel(cdns, CDNS_MCP_CLK_CTRL0, 1370 CDNS_MCP_CLK_MCLKD_MASK, divider); 1371 cdns_updatel(cdns, CDNS_MCP_CLK_CTRL1, 1372 CDNS_MCP_CLK_MCLKD_MASK, divider); 1373 1374 /* Set frame shape base on the actual bus frequency. */ 1375 prop->default_col = bus->params.curr_dr_freq / 1376 prop->default_frame_rate / prop->default_row; 1377 1378 /* 1379 * Frame shape changes after initialization have to be done 1380 * with the bank switch mechanism 1381 */ 1382 val = cdns_set_initial_frame_shape(prop->default_row, 1383 prop->default_col); 1384 cdns_writel(cdns, CDNS_MCP_FRAME_SHAPE_INIT, val); 1385 1386 /* Set SSP interval to default value */ 1387 ssp_interval = prop->default_frame_rate / SDW_CADENCE_GSYNC_HZ; 1388 cdns_writel(cdns, CDNS_MCP_SSP_CTRL0, ssp_interval); 1389 cdns_writel(cdns, CDNS_MCP_SSP_CTRL1, ssp_interval); 1390 1391 return 0; 1392 } 1393 1394 /** 1395 * sdw_cdns_soft_reset() - Cadence soft-reset 1396 * @cdns: Cadence instance 1397 */ 1398 int sdw_cdns_soft_reset(struct sdw_cdns *cdns) 1399 { 1400 int ret; 1401 1402 cdns_updatel(cdns, CDNS_MCP_CONTROL, CDNS_MCP_CONTROL_SOFT_RST, 1403 CDNS_MCP_CONTROL_SOFT_RST); 1404 1405 ret = cdns_config_update(cdns); 1406 if (ret < 0) { 1407 dev_err(cdns->dev, "%s: config update failed\n", __func__); 1408 return ret; 1409 } 1410 1411 ret = cdns_set_wait(cdns, CDNS_MCP_CONTROL, CDNS_MCP_CONTROL_SOFT_RST, 0); 1412 if (ret < 0) 1413 dev_err(cdns->dev, "%s: Soft Reset timed out\n", __func__); 1414 1415 return ret; 1416 } 1417 EXPORT_SYMBOL(sdw_cdns_soft_reset); 1418 1419 /** 1420 * sdw_cdns_init() - Cadence initialization 1421 * @cdns: Cadence instance 1422 */ 1423 int sdw_cdns_init(struct sdw_cdns *cdns) 1424 { 1425 int ret; 1426 u32 val; 1427 1428 ret = cdns_init_clock_ctrl(cdns); 1429 if (ret) 1430 return ret; 1431 1432 sdw_cdns_check_self_clearing_bits(cdns, __func__, false, 0); 1433 1434 /* reset msg_count to default value of FIFOLEVEL */ 1435 cdns->msg_count = cdns_readl(cdns, CDNS_MCP_FIFOLEVEL); 1436 1437 /* flush command FIFOs */ 1438 cdns_updatel(cdns, CDNS_MCP_CONTROL, CDNS_MCP_CONTROL_CMD_RST, 1439 CDNS_MCP_CONTROL_CMD_RST); 1440 1441 /* Set cmd accept mode */ 1442 cdns_ip_updatel(cdns, CDNS_IP_MCP_CONTROL, CDNS_IP_MCP_CONTROL_CMD_ACCEPT, 1443 CDNS_IP_MCP_CONTROL_CMD_ACCEPT); 1444 1445 /* disable wakeup */ 1446 cdns_ip_updatel(cdns, CDNS_IP_MCP_CONTROL, 1447 CDNS_IP_MCP_CONTROL_BLOCK_WAKEUP, 1448 0); 1449 1450 /* Configure mcp config */ 1451 val = cdns_readl(cdns, CDNS_MCP_CONFIG); 1452 1453 /* Disable auto bus release */ 1454 val &= ~CDNS_MCP_CONFIG_BUS_REL; 1455 1456 cdns_writel(cdns, CDNS_MCP_CONFIG, val); 1457 1458 /* Configure IP mcp config */ 1459 val = cdns_ip_readl(cdns, CDNS_IP_MCP_CONFIG); 1460 1461 /* enable bus operations with clock and data */ 1462 val &= ~CDNS_IP_MCP_CONFIG_OP; 1463 val |= CDNS_IP_MCP_CONFIG_OP_NORMAL; 1464 1465 /* Set cmd mode for Tx and Rx cmds */ 1466 val &= ~CDNS_IP_MCP_CONFIG_CMD; 1467 1468 /* Disable sniffer mode */ 1469 val &= ~CDNS_IP_MCP_CONFIG_SNIFFER; 1470 1471 if (cdns->bus.multi_link) 1472 /* Set Multi-master mode to take gsync into account */ 1473 val |= CDNS_IP_MCP_CONFIG_MMASTER; 1474 1475 /* leave frame delay to hardware default of 0x1F */ 1476 1477 /* leave command retry to hardware default of 0 */ 1478 1479 cdns_ip_writel(cdns, CDNS_IP_MCP_CONFIG, val); 1480 1481 /* changes will be committed later */ 1482 return 0; 1483 } 1484 EXPORT_SYMBOL(sdw_cdns_init); 1485 1486 int cdns_bus_conf(struct sdw_bus *bus, struct sdw_bus_params *params) 1487 { 1488 struct sdw_master_prop *prop = &bus->prop; 1489 struct sdw_cdns *cdns = bus_to_cdns(bus); 1490 int mcp_clkctrl_off; 1491 int divider; 1492 1493 if (!params->curr_dr_freq) { 1494 dev_err(cdns->dev, "NULL curr_dr_freq\n"); 1495 return -EINVAL; 1496 } 1497 1498 divider = prop->mclk_freq * SDW_DOUBLE_RATE_FACTOR / 1499 params->curr_dr_freq; 1500 divider--; /* divider is 1/(N+1) */ 1501 1502 if (params->next_bank) 1503 mcp_clkctrl_off = CDNS_MCP_CLK_CTRL1; 1504 else 1505 mcp_clkctrl_off = CDNS_MCP_CLK_CTRL0; 1506 1507 cdns_updatel(cdns, mcp_clkctrl_off, CDNS_MCP_CLK_MCLKD_MASK, divider); 1508 1509 return 0; 1510 } 1511 EXPORT_SYMBOL(cdns_bus_conf); 1512 1513 static int cdns_port_params(struct sdw_bus *bus, 1514 struct sdw_port_params *p_params, unsigned int bank) 1515 { 1516 struct sdw_cdns *cdns = bus_to_cdns(bus); 1517 int dpn_config_off_source; 1518 int dpn_config_off_target; 1519 int target_num = p_params->num; 1520 int source_num = p_params->num; 1521 bool override = false; 1522 int dpn_config; 1523 1524 if (target_num == cdns->pdi_loopback_target && 1525 cdns->pdi_loopback_source != -1) { 1526 source_num = cdns->pdi_loopback_source; 1527 override = true; 1528 } 1529 1530 if (bank) { 1531 dpn_config_off_source = CDNS_DPN_B1_CONFIG(source_num); 1532 dpn_config_off_target = CDNS_DPN_B1_CONFIG(target_num); 1533 } else { 1534 dpn_config_off_source = CDNS_DPN_B0_CONFIG(source_num); 1535 dpn_config_off_target = CDNS_DPN_B0_CONFIG(target_num); 1536 } 1537 1538 dpn_config = cdns_readl(cdns, dpn_config_off_source); 1539 1540 /* use port params if there is no loopback, otherwise use source as is */ 1541 if (!override) { 1542 u32p_replace_bits(&dpn_config, p_params->bps - 1, CDNS_DPN_CONFIG_WL); 1543 u32p_replace_bits(&dpn_config, p_params->flow_mode, CDNS_DPN_CONFIG_PORT_FLOW); 1544 u32p_replace_bits(&dpn_config, p_params->data_mode, CDNS_DPN_CONFIG_PORT_DAT); 1545 } 1546 1547 cdns_writel(cdns, dpn_config_off_target, dpn_config); 1548 1549 return 0; 1550 } 1551 1552 static int cdns_transport_params(struct sdw_bus *bus, 1553 struct sdw_transport_params *t_params, 1554 enum sdw_reg_bank bank) 1555 { 1556 struct sdw_cdns *cdns = bus_to_cdns(bus); 1557 int dpn_config; 1558 int dpn_config_off_source; 1559 int dpn_config_off_target; 1560 int dpn_hctrl; 1561 int dpn_hctrl_off_source; 1562 int dpn_hctrl_off_target; 1563 int dpn_offsetctrl; 1564 int dpn_offsetctrl_off_source; 1565 int dpn_offsetctrl_off_target; 1566 int dpn_samplectrl; 1567 int dpn_samplectrl_off_source; 1568 int dpn_samplectrl_off_target; 1569 int source_num = t_params->port_num; 1570 int target_num = t_params->port_num; 1571 bool override = false; 1572 1573 if (target_num == cdns->pdi_loopback_target && 1574 cdns->pdi_loopback_source != -1) { 1575 source_num = cdns->pdi_loopback_source; 1576 override = true; 1577 } 1578 1579 /* 1580 * Note: Only full data port is supported on the Master side for 1581 * both PCM and PDM ports. 1582 */ 1583 1584 if (bank) { 1585 dpn_config_off_source = CDNS_DPN_B1_CONFIG(source_num); 1586 dpn_hctrl_off_source = CDNS_DPN_B1_HCTRL(source_num); 1587 dpn_offsetctrl_off_source = CDNS_DPN_B1_OFFSET_CTRL(source_num); 1588 dpn_samplectrl_off_source = CDNS_DPN_B1_SAMPLE_CTRL(source_num); 1589 1590 dpn_config_off_target = CDNS_DPN_B1_CONFIG(target_num); 1591 dpn_hctrl_off_target = CDNS_DPN_B1_HCTRL(target_num); 1592 dpn_offsetctrl_off_target = CDNS_DPN_B1_OFFSET_CTRL(target_num); 1593 dpn_samplectrl_off_target = CDNS_DPN_B1_SAMPLE_CTRL(target_num); 1594 1595 } else { 1596 dpn_config_off_source = CDNS_DPN_B0_CONFIG(source_num); 1597 dpn_hctrl_off_source = CDNS_DPN_B0_HCTRL(source_num); 1598 dpn_offsetctrl_off_source = CDNS_DPN_B0_OFFSET_CTRL(source_num); 1599 dpn_samplectrl_off_source = CDNS_DPN_B0_SAMPLE_CTRL(source_num); 1600 1601 dpn_config_off_target = CDNS_DPN_B0_CONFIG(target_num); 1602 dpn_hctrl_off_target = CDNS_DPN_B0_HCTRL(target_num); 1603 dpn_offsetctrl_off_target = CDNS_DPN_B0_OFFSET_CTRL(target_num); 1604 dpn_samplectrl_off_target = CDNS_DPN_B0_SAMPLE_CTRL(target_num); 1605 } 1606 1607 dpn_config = cdns_readl(cdns, dpn_config_off_source); 1608 if (!override) { 1609 u32p_replace_bits(&dpn_config, t_params->blk_grp_ctrl, CDNS_DPN_CONFIG_BGC); 1610 u32p_replace_bits(&dpn_config, t_params->blk_pkg_mode, CDNS_DPN_CONFIG_BPM); 1611 } 1612 cdns_writel(cdns, dpn_config_off_target, dpn_config); 1613 1614 if (!override) { 1615 dpn_offsetctrl = 0; 1616 u32p_replace_bits(&dpn_offsetctrl, t_params->offset1, CDNS_DPN_OFFSET_CTRL_1); 1617 u32p_replace_bits(&dpn_offsetctrl, t_params->offset2, CDNS_DPN_OFFSET_CTRL_2); 1618 } else { 1619 dpn_offsetctrl = cdns_readl(cdns, dpn_offsetctrl_off_source); 1620 } 1621 cdns_writel(cdns, dpn_offsetctrl_off_target, dpn_offsetctrl); 1622 1623 if (!override) { 1624 dpn_hctrl = 0; 1625 u32p_replace_bits(&dpn_hctrl, t_params->hstart, CDNS_DPN_HCTRL_HSTART); 1626 u32p_replace_bits(&dpn_hctrl, t_params->hstop, CDNS_DPN_HCTRL_HSTOP); 1627 u32p_replace_bits(&dpn_hctrl, t_params->lane_ctrl, CDNS_DPN_HCTRL_LCTRL); 1628 } else { 1629 dpn_hctrl = cdns_readl(cdns, dpn_hctrl_off_source); 1630 } 1631 cdns_writel(cdns, dpn_hctrl_off_target, dpn_hctrl); 1632 1633 if (!override) 1634 dpn_samplectrl = t_params->sample_interval - 1; 1635 else 1636 dpn_samplectrl = cdns_readl(cdns, dpn_samplectrl_off_source); 1637 cdns_writel(cdns, dpn_samplectrl_off_target, dpn_samplectrl); 1638 1639 return 0; 1640 } 1641 1642 static int cdns_port_enable(struct sdw_bus *bus, 1643 struct sdw_enable_ch *enable_ch, unsigned int bank) 1644 { 1645 struct sdw_cdns *cdns = bus_to_cdns(bus); 1646 int dpn_chnen_off, ch_mask; 1647 1648 if (bank) 1649 dpn_chnen_off = CDNS_DPN_B1_CH_EN(enable_ch->port_num); 1650 else 1651 dpn_chnen_off = CDNS_DPN_B0_CH_EN(enable_ch->port_num); 1652 1653 ch_mask = enable_ch->ch_mask * enable_ch->enable; 1654 cdns_writel(cdns, dpn_chnen_off, ch_mask); 1655 1656 return 0; 1657 } 1658 1659 static const struct sdw_master_port_ops cdns_port_ops = { 1660 .dpn_set_port_params = cdns_port_params, 1661 .dpn_set_port_transport_params = cdns_transport_params, 1662 .dpn_port_enable_ch = cdns_port_enable, 1663 }; 1664 1665 /** 1666 * sdw_cdns_is_clock_stop: Check clock status 1667 * 1668 * @cdns: Cadence instance 1669 */ 1670 bool sdw_cdns_is_clock_stop(struct sdw_cdns *cdns) 1671 { 1672 return !!(cdns_readl(cdns, CDNS_MCP_STAT) & CDNS_MCP_STAT_CLK_STOP); 1673 } 1674 EXPORT_SYMBOL(sdw_cdns_is_clock_stop); 1675 1676 /** 1677 * sdw_cdns_clock_stop: Cadence clock stop configuration routine 1678 * 1679 * @cdns: Cadence instance 1680 * @block_wake: prevent wakes if required by the platform 1681 */ 1682 int sdw_cdns_clock_stop(struct sdw_cdns *cdns, bool block_wake) 1683 { 1684 bool slave_present = false; 1685 struct sdw_slave *slave; 1686 int ret; 1687 1688 sdw_cdns_check_self_clearing_bits(cdns, __func__, false, 0); 1689 1690 /* Check suspend status */ 1691 if (sdw_cdns_is_clock_stop(cdns)) { 1692 dev_dbg(cdns->dev, "Clock is already stopped\n"); 1693 return 0; 1694 } 1695 1696 /* 1697 * Before entering clock stop we mask the Slave 1698 * interrupts. This helps avoid having to deal with e.g. a 1699 * Slave becoming UNATTACHED while the clock is being stopped 1700 */ 1701 cdns_enable_slave_interrupts(cdns, false); 1702 1703 /* 1704 * For specific platforms, it is required to be able to put 1705 * master into a state in which it ignores wake-up trials 1706 * in clock stop state 1707 */ 1708 if (block_wake) 1709 cdns_ip_updatel(cdns, CDNS_IP_MCP_CONTROL, 1710 CDNS_IP_MCP_CONTROL_BLOCK_WAKEUP, 1711 CDNS_IP_MCP_CONTROL_BLOCK_WAKEUP); 1712 1713 list_for_each_entry(slave, &cdns->bus.slaves, node) { 1714 if (slave->status == SDW_SLAVE_ATTACHED || 1715 slave->status == SDW_SLAVE_ALERT) { 1716 slave_present = true; 1717 break; 1718 } 1719 } 1720 1721 /* commit changes */ 1722 ret = cdns_config_update(cdns); 1723 if (ret < 0) { 1724 dev_err(cdns->dev, "%s: config_update failed\n", __func__); 1725 return ret; 1726 } 1727 1728 /* Prepare slaves for clock stop */ 1729 if (slave_present) { 1730 ret = sdw_bus_prep_clk_stop(&cdns->bus); 1731 if (ret < 0 && ret != -ENODATA) { 1732 dev_err(cdns->dev, "prepare clock stop failed %d\n", ret); 1733 return ret; 1734 } 1735 } 1736 1737 /* 1738 * Enter clock stop mode and only report errors if there are 1739 * Slave devices present (ALERT or ATTACHED) 1740 */ 1741 ret = sdw_bus_clk_stop(&cdns->bus); 1742 if (ret < 0 && slave_present && ret != -ENODATA) { 1743 dev_err(cdns->dev, "bus clock stop failed %d\n", ret); 1744 return ret; 1745 } 1746 1747 ret = cdns_set_wait(cdns, CDNS_MCP_STAT, 1748 CDNS_MCP_STAT_CLK_STOP, 1749 CDNS_MCP_STAT_CLK_STOP); 1750 if (ret < 0) 1751 dev_err(cdns->dev, "Clock stop failed %d\n", ret); 1752 1753 return ret; 1754 } 1755 EXPORT_SYMBOL(sdw_cdns_clock_stop); 1756 1757 /** 1758 * sdw_cdns_clock_restart: Cadence PM clock restart configuration routine 1759 * 1760 * @cdns: Cadence instance 1761 * @bus_reset: context may be lost while in low power modes and the bus 1762 * may require a Severe Reset and re-enumeration after a wake. 1763 */ 1764 int sdw_cdns_clock_restart(struct sdw_cdns *cdns, bool bus_reset) 1765 { 1766 int ret; 1767 1768 /* unmask Slave interrupts that were masked when stopping the clock */ 1769 cdns_enable_slave_interrupts(cdns, true); 1770 1771 ret = cdns_clear_bit(cdns, CDNS_MCP_CONTROL, 1772 CDNS_MCP_CONTROL_CLK_STOP_CLR); 1773 if (ret < 0) { 1774 dev_err(cdns->dev, "Couldn't exit from clock stop\n"); 1775 return ret; 1776 } 1777 1778 ret = cdns_set_wait(cdns, CDNS_MCP_STAT, CDNS_MCP_STAT_CLK_STOP, 0); 1779 if (ret < 0) { 1780 dev_err(cdns->dev, "clock stop exit failed %d\n", ret); 1781 return ret; 1782 } 1783 1784 cdns_ip_updatel(cdns, CDNS_IP_MCP_CONTROL, 1785 CDNS_IP_MCP_CONTROL_BLOCK_WAKEUP, 0); 1786 1787 cdns_ip_updatel(cdns, CDNS_IP_MCP_CONTROL, CDNS_IP_MCP_CONTROL_CMD_ACCEPT, 1788 CDNS_IP_MCP_CONTROL_CMD_ACCEPT); 1789 1790 if (!bus_reset) { 1791 1792 /* enable bus operations with clock and data */ 1793 cdns_ip_updatel(cdns, CDNS_IP_MCP_CONFIG, 1794 CDNS_IP_MCP_CONFIG_OP, 1795 CDNS_IP_MCP_CONFIG_OP_NORMAL); 1796 1797 ret = cdns_config_update(cdns); 1798 if (ret < 0) { 1799 dev_err(cdns->dev, "%s: config_update failed\n", __func__); 1800 return ret; 1801 } 1802 1803 ret = sdw_bus_exit_clk_stop(&cdns->bus); 1804 if (ret < 0) 1805 dev_err(cdns->dev, "bus failed to exit clock stop %d\n", ret); 1806 } 1807 1808 return ret; 1809 } 1810 EXPORT_SYMBOL(sdw_cdns_clock_restart); 1811 1812 /** 1813 * sdw_cdns_probe() - Cadence probe routine 1814 * @cdns: Cadence instance 1815 */ 1816 int sdw_cdns_probe(struct sdw_cdns *cdns) 1817 { 1818 init_completion(&cdns->tx_complete); 1819 cdns->bus.port_ops = &cdns_port_ops; 1820 1821 mutex_init(&cdns->status_update_lock); 1822 1823 INIT_WORK(&cdns->work, cdns_update_slave_status_work); 1824 INIT_DELAYED_WORK(&cdns->attach_dwork, cdns_check_attached_status_dwork); 1825 1826 return 0; 1827 } 1828 EXPORT_SYMBOL(sdw_cdns_probe); 1829 1830 int cdns_set_sdw_stream(struct snd_soc_dai *dai, 1831 void *stream, int direction) 1832 { 1833 struct sdw_cdns *cdns = snd_soc_dai_get_drvdata(dai); 1834 struct sdw_cdns_dai_runtime *dai_runtime; 1835 1836 dai_runtime = cdns->dai_runtime_array[dai->id]; 1837 1838 if (stream) { 1839 /* first paranoia check */ 1840 if (dai_runtime) { 1841 dev_err(dai->dev, 1842 "dai_runtime already allocated for dai %s\n", 1843 dai->name); 1844 return -EINVAL; 1845 } 1846 1847 /* allocate and set dai_runtime info */ 1848 dai_runtime = kzalloc(sizeof(*dai_runtime), GFP_KERNEL); 1849 if (!dai_runtime) 1850 return -ENOMEM; 1851 1852 dai_runtime->stream_type = SDW_STREAM_PCM; 1853 1854 dai_runtime->bus = &cdns->bus; 1855 dai_runtime->link_id = cdns->instance; 1856 1857 dai_runtime->stream = stream; 1858 dai_runtime->direction = direction; 1859 1860 cdns->dai_runtime_array[dai->id] = dai_runtime; 1861 } else { 1862 /* second paranoia check */ 1863 if (!dai_runtime) { 1864 dev_err(dai->dev, 1865 "dai_runtime not allocated for dai %s\n", 1866 dai->name); 1867 return -EINVAL; 1868 } 1869 1870 /* for NULL stream we release allocated dai_runtime */ 1871 kfree(dai_runtime); 1872 cdns->dai_runtime_array[dai->id] = NULL; 1873 } 1874 return 0; 1875 } 1876 EXPORT_SYMBOL(cdns_set_sdw_stream); 1877 1878 /** 1879 * cdns_find_pdi() - Find a free PDI 1880 * 1881 * @cdns: Cadence instance 1882 * @num: Number of PDIs 1883 * @pdi: PDI instances 1884 * @dai_id: DAI id 1885 * 1886 * Find a PDI for a given PDI array. The PDI num and dai_id are 1887 * expected to match, return NULL otherwise. 1888 */ 1889 static struct sdw_cdns_pdi *cdns_find_pdi(struct sdw_cdns *cdns, 1890 unsigned int num, 1891 struct sdw_cdns_pdi *pdi, 1892 int dai_id) 1893 { 1894 int i; 1895 1896 for (i = 0; i < num; i++) 1897 if (pdi[i].num == dai_id) 1898 return &pdi[i]; 1899 1900 return NULL; 1901 } 1902 1903 /** 1904 * sdw_cdns_config_stream: Configure a stream 1905 * 1906 * @cdns: Cadence instance 1907 * @ch: Channel count 1908 * @dir: Data direction 1909 * @pdi: PDI to be used 1910 */ 1911 void sdw_cdns_config_stream(struct sdw_cdns *cdns, 1912 u32 ch, u32 dir, struct sdw_cdns_pdi *pdi) 1913 { 1914 u32 offset, val = 0; 1915 1916 if (dir == SDW_DATA_DIR_RX) { 1917 val = CDNS_PORTCTRL_DIRN; 1918 1919 if (cdns->bus.params.m_data_mode != SDW_PORT_DATA_MODE_NORMAL) 1920 val |= CDNS_PORTCTRL_TEST_FAILED; 1921 } else if (pdi->num == 0 || pdi->num == 1) { 1922 val |= CDNS_PORTCTRL_BULK_ENABLE; 1923 } 1924 offset = CDNS_PORTCTRL + pdi->num * CDNS_PORT_OFFSET; 1925 cdns_updatel(cdns, offset, 1926 CDNS_PORTCTRL_DIRN | CDNS_PORTCTRL_TEST_FAILED | 1927 CDNS_PORTCTRL_BULK_ENABLE, 1928 val); 1929 1930 /* The DataPort0 needs to be mapped to both PDI0 and PDI1 ! */ 1931 if (pdi->num == 1) 1932 val = 0; 1933 else 1934 val = pdi->num; 1935 val |= CDNS_PDI_CONFIG_SOFT_RESET; 1936 val |= FIELD_PREP(CDNS_PDI_CONFIG_CHANNEL, (1 << ch) - 1); 1937 cdns_writel(cdns, CDNS_PDI_CONFIG(pdi->num), val); 1938 } 1939 EXPORT_SYMBOL(sdw_cdns_config_stream); 1940 1941 /** 1942 * sdw_cdns_alloc_pdi() - Allocate a PDI 1943 * 1944 * @cdns: Cadence instance 1945 * @stream: Stream to be allocated 1946 * @ch: Channel count 1947 * @dir: Data direction 1948 * @dai_id: DAI id 1949 */ 1950 struct sdw_cdns_pdi *sdw_cdns_alloc_pdi(struct sdw_cdns *cdns, 1951 struct sdw_cdns_streams *stream, 1952 u32 ch, u32 dir, int dai_id) 1953 { 1954 struct sdw_cdns_pdi *pdi = NULL; 1955 1956 if (dir == SDW_DATA_DIR_RX) 1957 pdi = cdns_find_pdi(cdns, stream->num_in, stream->in, 1958 dai_id); 1959 else 1960 pdi = cdns_find_pdi(cdns, stream->num_out, stream->out, 1961 dai_id); 1962 1963 /* check if we found a PDI, else find in bi-directional */ 1964 if (!pdi) 1965 pdi = cdns_find_pdi(cdns, stream->num_bd, stream->bd, 1966 dai_id); 1967 1968 if (pdi) { 1969 pdi->l_ch_num = 0; 1970 pdi->h_ch_num = ch - 1; 1971 pdi->dir = dir; 1972 pdi->ch_count = ch; 1973 } 1974 1975 return pdi; 1976 } 1977 EXPORT_SYMBOL(sdw_cdns_alloc_pdi); 1978 1979 MODULE_LICENSE("Dual BSD/GPL"); 1980 MODULE_DESCRIPTION("Cadence Soundwire Library"); 1981