1 // SPDX-License-Identifier: (GPL-2.0 OR BSD-3-Clause) 2 // Copyright(c) 2015-17 Intel Corporation. 3 4 /* 5 * Cadence SoundWire Master module 6 * Used by Master driver 7 */ 8 9 #include <linux/delay.h> 10 #include <linux/device.h> 11 #include <linux/debugfs.h> 12 #include <linux/interrupt.h> 13 #include <linux/io.h> 14 #include <linux/module.h> 15 #include <linux/mod_devicetable.h> 16 #include <linux/pm_runtime.h> 17 #include <linux/soundwire/sdw_registers.h> 18 #include <linux/soundwire/sdw.h> 19 #include <sound/pcm_params.h> 20 #include <sound/soc.h> 21 #include <linux/workqueue.h> 22 #include "bus.h" 23 #include "cadence_master.h" 24 25 static int interrupt_mask; 26 module_param_named(cnds_mcp_int_mask, interrupt_mask, int, 0444); 27 MODULE_PARM_DESC(cdns_mcp_int_mask, "Cadence MCP IntMask"); 28 29 #define CDNS_MCP_CONFIG 0x0 30 31 #define CDNS_MCP_CONFIG_MCMD_RETRY GENMASK(27, 24) 32 #define CDNS_MCP_CONFIG_MPREQ_DELAY GENMASK(20, 16) 33 #define CDNS_MCP_CONFIG_MMASTER BIT(7) 34 #define CDNS_MCP_CONFIG_BUS_REL BIT(6) 35 #define CDNS_MCP_CONFIG_SNIFFER BIT(5) 36 #define CDNS_MCP_CONFIG_SSPMOD BIT(4) 37 #define CDNS_MCP_CONFIG_CMD BIT(3) 38 #define CDNS_MCP_CONFIG_OP GENMASK(2, 0) 39 #define CDNS_MCP_CONFIG_OP_NORMAL 0 40 41 #define CDNS_MCP_CONTROL 0x4 42 43 #define CDNS_MCP_CONTROL_RST_DELAY GENMASK(10, 8) 44 #define CDNS_MCP_CONTROL_CMD_RST BIT(7) 45 #define CDNS_MCP_CONTROL_SOFT_RST BIT(6) 46 #define CDNS_MCP_CONTROL_SW_RST BIT(5) 47 #define CDNS_MCP_CONTROL_HW_RST BIT(4) 48 #define CDNS_MCP_CONTROL_CLK_PAUSE BIT(3) 49 #define CDNS_MCP_CONTROL_CLK_STOP_CLR BIT(2) 50 #define CDNS_MCP_CONTROL_CMD_ACCEPT BIT(1) 51 #define CDNS_MCP_CONTROL_BLOCK_WAKEUP BIT(0) 52 53 #define CDNS_MCP_CMDCTRL 0x8 54 55 #define CDNS_MCP_CMDCTRL_INSERT_PARITY_ERR BIT(2) 56 57 #define CDNS_MCP_SSPSTAT 0xC 58 #define CDNS_MCP_FRAME_SHAPE 0x10 59 #define CDNS_MCP_FRAME_SHAPE_INIT 0x14 60 #define CDNS_MCP_FRAME_SHAPE_COL_MASK GENMASK(2, 0) 61 #define CDNS_MCP_FRAME_SHAPE_ROW_MASK GENMASK(7, 3) 62 63 #define CDNS_MCP_CONFIG_UPDATE 0x18 64 #define CDNS_MCP_CONFIG_UPDATE_BIT BIT(0) 65 66 #define CDNS_MCP_PHYCTRL 0x1C 67 #define CDNS_MCP_SSP_CTRL0 0x20 68 #define CDNS_MCP_SSP_CTRL1 0x28 69 #define CDNS_MCP_CLK_CTRL0 0x30 70 #define CDNS_MCP_CLK_CTRL1 0x38 71 #define CDNS_MCP_CLK_MCLKD_MASK GENMASK(7, 0) 72 73 #define CDNS_MCP_STAT 0x40 74 75 #define CDNS_MCP_STAT_ACTIVE_BANK BIT(20) 76 #define CDNS_MCP_STAT_CLK_STOP BIT(16) 77 78 #define CDNS_MCP_INTSTAT 0x44 79 #define CDNS_MCP_INTMASK 0x48 80 81 #define CDNS_MCP_INT_IRQ BIT(31) 82 #define CDNS_MCP_INT_RESERVED1 GENMASK(30, 17) 83 #define CDNS_MCP_INT_WAKEUP BIT(16) 84 #define CDNS_MCP_INT_SLAVE_RSVD BIT(15) 85 #define CDNS_MCP_INT_SLAVE_ALERT BIT(14) 86 #define CDNS_MCP_INT_SLAVE_ATTACH BIT(13) 87 #define CDNS_MCP_INT_SLAVE_NATTACH BIT(12) 88 #define CDNS_MCP_INT_SLAVE_MASK GENMASK(15, 12) 89 #define CDNS_MCP_INT_DPINT BIT(11) 90 #define CDNS_MCP_INT_CTRL_CLASH BIT(10) 91 #define CDNS_MCP_INT_DATA_CLASH BIT(9) 92 #define CDNS_MCP_INT_PARITY BIT(8) 93 #define CDNS_MCP_INT_CMD_ERR BIT(7) 94 #define CDNS_MCP_INT_RESERVED2 GENMASK(6, 4) 95 #define CDNS_MCP_INT_RX_NE BIT(3) 96 #define CDNS_MCP_INT_RX_WL BIT(2) 97 #define CDNS_MCP_INT_TXE BIT(1) 98 #define CDNS_MCP_INT_TXF BIT(0) 99 #define CDNS_MCP_INT_RESERVED (CDNS_MCP_INT_RESERVED1 | CDNS_MCP_INT_RESERVED2) 100 101 #define CDNS_MCP_INTSET 0x4C 102 103 #define CDNS_MCP_SLAVE_STAT 0x50 104 #define CDNS_MCP_SLAVE_STAT_MASK GENMASK(1, 0) 105 106 #define CDNS_MCP_SLAVE_INTSTAT0 0x54 107 #define CDNS_MCP_SLAVE_INTSTAT1 0x58 108 #define CDNS_MCP_SLAVE_INTSTAT_NPRESENT BIT(0) 109 #define CDNS_MCP_SLAVE_INTSTAT_ATTACHED BIT(1) 110 #define CDNS_MCP_SLAVE_INTSTAT_ALERT BIT(2) 111 #define CDNS_MCP_SLAVE_INTSTAT_RESERVED BIT(3) 112 #define CDNS_MCP_SLAVE_STATUS_BITS GENMASK(3, 0) 113 #define CDNS_MCP_SLAVE_STATUS_NUM 4 114 115 #define CDNS_MCP_SLAVE_INTMASK0 0x5C 116 #define CDNS_MCP_SLAVE_INTMASK1 0x60 117 118 #define CDNS_MCP_SLAVE_INTMASK0_MASK GENMASK(31, 0) 119 #define CDNS_MCP_SLAVE_INTMASK1_MASK GENMASK(15, 0) 120 121 #define CDNS_MCP_PORT_INTSTAT 0x64 122 #define CDNS_MCP_PDI_STAT 0x6C 123 124 #define CDNS_MCP_FIFOLEVEL 0x78 125 #define CDNS_MCP_FIFOSTAT 0x7C 126 #define CDNS_MCP_RX_FIFO_AVAIL GENMASK(5, 0) 127 128 #define CDNS_MCP_CMD_BASE 0x80 129 #define CDNS_MCP_RESP_BASE 0x80 130 #define CDNS_MCP_CMD_LEN 0x20 131 #define CDNS_MCP_CMD_WORD_LEN 0x4 132 133 #define CDNS_MCP_CMD_SSP_TAG BIT(31) 134 #define CDNS_MCP_CMD_COMMAND GENMASK(30, 28) 135 #define CDNS_MCP_CMD_DEV_ADDR GENMASK(27, 24) 136 #define CDNS_MCP_CMD_REG_ADDR GENMASK(23, 8) 137 #define CDNS_MCP_CMD_REG_DATA GENMASK(7, 0) 138 139 #define CDNS_MCP_CMD_READ 2 140 #define CDNS_MCP_CMD_WRITE 3 141 142 #define CDNS_MCP_RESP_RDATA GENMASK(15, 8) 143 #define CDNS_MCP_RESP_ACK BIT(0) 144 #define CDNS_MCP_RESP_NACK BIT(1) 145 146 #define CDNS_DP_SIZE 128 147 148 #define CDNS_DPN_B0_CONFIG(n) (0x100 + CDNS_DP_SIZE * (n)) 149 #define CDNS_DPN_B0_CH_EN(n) (0x104 + CDNS_DP_SIZE * (n)) 150 #define CDNS_DPN_B0_SAMPLE_CTRL(n) (0x108 + CDNS_DP_SIZE * (n)) 151 #define CDNS_DPN_B0_OFFSET_CTRL(n) (0x10C + CDNS_DP_SIZE * (n)) 152 #define CDNS_DPN_B0_HCTRL(n) (0x110 + CDNS_DP_SIZE * (n)) 153 #define CDNS_DPN_B0_ASYNC_CTRL(n) (0x114 + CDNS_DP_SIZE * (n)) 154 155 #define CDNS_DPN_B1_CONFIG(n) (0x118 + CDNS_DP_SIZE * (n)) 156 #define CDNS_DPN_B1_CH_EN(n) (0x11C + CDNS_DP_SIZE * (n)) 157 #define CDNS_DPN_B1_SAMPLE_CTRL(n) (0x120 + CDNS_DP_SIZE * (n)) 158 #define CDNS_DPN_B1_OFFSET_CTRL(n) (0x124 + CDNS_DP_SIZE * (n)) 159 #define CDNS_DPN_B1_HCTRL(n) (0x128 + CDNS_DP_SIZE * (n)) 160 #define CDNS_DPN_B1_ASYNC_CTRL(n) (0x12C + CDNS_DP_SIZE * (n)) 161 162 #define CDNS_DPN_CONFIG_BPM BIT(18) 163 #define CDNS_DPN_CONFIG_BGC GENMASK(17, 16) 164 #define CDNS_DPN_CONFIG_WL GENMASK(12, 8) 165 #define CDNS_DPN_CONFIG_PORT_DAT GENMASK(3, 2) 166 #define CDNS_DPN_CONFIG_PORT_FLOW GENMASK(1, 0) 167 168 #define CDNS_DPN_SAMPLE_CTRL_SI GENMASK(15, 0) 169 170 #define CDNS_DPN_OFFSET_CTRL_1 GENMASK(7, 0) 171 #define CDNS_DPN_OFFSET_CTRL_2 GENMASK(15, 8) 172 173 #define CDNS_DPN_HCTRL_HSTOP GENMASK(3, 0) 174 #define CDNS_DPN_HCTRL_HSTART GENMASK(7, 4) 175 #define CDNS_DPN_HCTRL_LCTRL GENMASK(10, 8) 176 177 #define CDNS_PORTCTRL 0x130 178 #define CDNS_PORTCTRL_TEST_FAILED BIT(1) 179 #define CDNS_PORTCTRL_DIRN BIT(7) 180 #define CDNS_PORTCTRL_BANK_INVERT BIT(8) 181 182 #define CDNS_PORT_OFFSET 0x80 183 184 #define CDNS_PDI_CONFIG(n) (0x1100 + (n) * 16) 185 186 #define CDNS_PDI_CONFIG_SOFT_RESET BIT(24) 187 #define CDNS_PDI_CONFIG_CHANNEL GENMASK(15, 8) 188 #define CDNS_PDI_CONFIG_PORT GENMASK(4, 0) 189 190 /* Driver defaults */ 191 #define CDNS_TX_TIMEOUT 2000 192 193 #define CDNS_SCP_RX_FIFOLEVEL 0x2 194 195 /* 196 * register accessor helpers 197 */ 198 static inline u32 cdns_readl(struct sdw_cdns *cdns, int offset) 199 { 200 return readl(cdns->registers + offset); 201 } 202 203 static inline void cdns_writel(struct sdw_cdns *cdns, int offset, u32 value) 204 { 205 writel(value, cdns->registers + offset); 206 } 207 208 static inline void cdns_updatel(struct sdw_cdns *cdns, 209 int offset, u32 mask, u32 val) 210 { 211 u32 tmp; 212 213 tmp = cdns_readl(cdns, offset); 214 tmp = (tmp & ~mask) | val; 215 cdns_writel(cdns, offset, tmp); 216 } 217 218 static int cdns_set_wait(struct sdw_cdns *cdns, int offset, u32 mask, u32 value) 219 { 220 int timeout = 10; 221 u32 reg_read; 222 223 /* Wait for bit to be set */ 224 do { 225 reg_read = readl(cdns->registers + offset); 226 if ((reg_read & mask) == value) 227 return 0; 228 229 timeout--; 230 usleep_range(50, 100); 231 } while (timeout != 0); 232 233 return -ETIMEDOUT; 234 } 235 236 static int cdns_clear_bit(struct sdw_cdns *cdns, int offset, u32 value) 237 { 238 writel(value, cdns->registers + offset); 239 240 /* Wait for bit to be self cleared */ 241 return cdns_set_wait(cdns, offset, value, 0); 242 } 243 244 /* 245 * all changes to the MCP_CONFIG, MCP_CONTROL, MCP_CMDCTRL and MCP_PHYCTRL 246 * need to be confirmed with a write to MCP_CONFIG_UPDATE 247 */ 248 static int cdns_config_update(struct sdw_cdns *cdns) 249 { 250 int ret; 251 252 if (sdw_cdns_is_clock_stop(cdns)) { 253 dev_err(cdns->dev, "Cannot program MCP_CONFIG_UPDATE in ClockStopMode\n"); 254 return -EINVAL; 255 } 256 257 ret = cdns_clear_bit(cdns, CDNS_MCP_CONFIG_UPDATE, 258 CDNS_MCP_CONFIG_UPDATE_BIT); 259 if (ret < 0) 260 dev_err(cdns->dev, "Config update timedout\n"); 261 262 return ret; 263 } 264 265 /* 266 * debugfs 267 */ 268 #ifdef CONFIG_DEBUG_FS 269 270 #define RD_BUF (2 * PAGE_SIZE) 271 272 static ssize_t cdns_sprintf(struct sdw_cdns *cdns, 273 char *buf, size_t pos, unsigned int reg) 274 { 275 return scnprintf(buf + pos, RD_BUF - pos, 276 "%4x\t%8x\n", reg, cdns_readl(cdns, reg)); 277 } 278 279 static int cdns_reg_show(struct seq_file *s, void *data) 280 { 281 struct sdw_cdns *cdns = s->private; 282 char *buf; 283 ssize_t ret; 284 int num_ports; 285 int i, j; 286 287 buf = kzalloc(RD_BUF, GFP_KERNEL); 288 if (!buf) 289 return -ENOMEM; 290 291 ret = scnprintf(buf, RD_BUF, "Register Value\n"); 292 ret += scnprintf(buf + ret, RD_BUF - ret, "\nMCP Registers\n"); 293 /* 8 MCP registers */ 294 for (i = CDNS_MCP_CONFIG; i <= CDNS_MCP_PHYCTRL; i += sizeof(u32)) 295 ret += cdns_sprintf(cdns, buf, ret, i); 296 297 ret += scnprintf(buf + ret, RD_BUF - ret, 298 "\nStatus & Intr Registers\n"); 299 /* 13 Status & Intr registers (offsets 0x70 and 0x74 not defined) */ 300 for (i = CDNS_MCP_STAT; i <= CDNS_MCP_FIFOSTAT; i += sizeof(u32)) 301 ret += cdns_sprintf(cdns, buf, ret, i); 302 303 ret += scnprintf(buf + ret, RD_BUF - ret, 304 "\nSSP & Clk ctrl Registers\n"); 305 ret += cdns_sprintf(cdns, buf, ret, CDNS_MCP_SSP_CTRL0); 306 ret += cdns_sprintf(cdns, buf, ret, CDNS_MCP_SSP_CTRL1); 307 ret += cdns_sprintf(cdns, buf, ret, CDNS_MCP_CLK_CTRL0); 308 ret += cdns_sprintf(cdns, buf, ret, CDNS_MCP_CLK_CTRL1); 309 310 ret += scnprintf(buf + ret, RD_BUF - ret, 311 "\nDPn B0 Registers\n"); 312 313 num_ports = cdns->num_ports; 314 315 for (i = 0; i < num_ports; i++) { 316 ret += scnprintf(buf + ret, RD_BUF - ret, 317 "\nDP-%d\n", i); 318 for (j = CDNS_DPN_B0_CONFIG(i); 319 j < CDNS_DPN_B0_ASYNC_CTRL(i); j += sizeof(u32)) 320 ret += cdns_sprintf(cdns, buf, ret, j); 321 } 322 323 ret += scnprintf(buf + ret, RD_BUF - ret, 324 "\nDPn B1 Registers\n"); 325 for (i = 0; i < num_ports; i++) { 326 ret += scnprintf(buf + ret, RD_BUF - ret, 327 "\nDP-%d\n", i); 328 329 for (j = CDNS_DPN_B1_CONFIG(i); 330 j < CDNS_DPN_B1_ASYNC_CTRL(i); j += sizeof(u32)) 331 ret += cdns_sprintf(cdns, buf, ret, j); 332 } 333 334 ret += scnprintf(buf + ret, RD_BUF - ret, 335 "\nDPn Control Registers\n"); 336 for (i = 0; i < num_ports; i++) 337 ret += cdns_sprintf(cdns, buf, ret, 338 CDNS_PORTCTRL + i * CDNS_PORT_OFFSET); 339 340 ret += scnprintf(buf + ret, RD_BUF - ret, 341 "\nPDIn Config Registers\n"); 342 343 /* number of PDI and ports is interchangeable */ 344 for (i = 0; i < num_ports; i++) 345 ret += cdns_sprintf(cdns, buf, ret, CDNS_PDI_CONFIG(i)); 346 347 seq_printf(s, "%s", buf); 348 kfree(buf); 349 350 return 0; 351 } 352 DEFINE_SHOW_ATTRIBUTE(cdns_reg); 353 354 static int cdns_hw_reset(void *data, u64 value) 355 { 356 struct sdw_cdns *cdns = data; 357 int ret; 358 359 if (value != 1) 360 return -EINVAL; 361 362 /* Userspace changed the hardware state behind the kernel's back */ 363 add_taint(TAINT_USER, LOCKDEP_STILL_OK); 364 365 ret = sdw_cdns_exit_reset(cdns); 366 367 dev_dbg(cdns->dev, "link hw_reset done: %d\n", ret); 368 369 return ret; 370 } 371 372 DEFINE_DEBUGFS_ATTRIBUTE(cdns_hw_reset_fops, NULL, cdns_hw_reset, "%llu\n"); 373 374 static int cdns_parity_error_injection(void *data, u64 value) 375 { 376 struct sdw_cdns *cdns = data; 377 struct sdw_bus *bus; 378 int ret; 379 380 if (value != 1) 381 return -EINVAL; 382 383 bus = &cdns->bus; 384 385 /* 386 * Resume Master device. If this results in a bus reset, the 387 * Slave devices will re-attach and be re-enumerated. 388 */ 389 ret = pm_runtime_get_sync(bus->dev); 390 if (ret < 0 && ret != -EACCES) { 391 dev_err_ratelimited(cdns->dev, 392 "pm_runtime_get_sync failed in %s, ret %d\n", 393 __func__, ret); 394 pm_runtime_put_noidle(bus->dev); 395 return ret; 396 } 397 398 /* 399 * wait long enough for Slave(s) to be in steady state. This 400 * does not need to be super precise. 401 */ 402 msleep(200); 403 404 /* 405 * Take the bus lock here to make sure that any bus transactions 406 * will be queued while we inject a parity error on a dummy read 407 */ 408 mutex_lock(&bus->bus_lock); 409 410 /* program hardware to inject parity error */ 411 cdns_updatel(cdns, CDNS_MCP_CMDCTRL, 412 CDNS_MCP_CMDCTRL_INSERT_PARITY_ERR, 413 CDNS_MCP_CMDCTRL_INSERT_PARITY_ERR); 414 415 /* commit changes */ 416 cdns_updatel(cdns, CDNS_MCP_CONFIG_UPDATE, 417 CDNS_MCP_CONFIG_UPDATE_BIT, 418 CDNS_MCP_CONFIG_UPDATE_BIT); 419 420 /* do a broadcast dummy read to avoid bus clashes */ 421 ret = sdw_bread_no_pm_unlocked(&cdns->bus, 0xf, SDW_SCP_DEVID_0); 422 dev_info(cdns->dev, "parity error injection, read: %d\n", ret); 423 424 /* program hardware to disable parity error */ 425 cdns_updatel(cdns, CDNS_MCP_CMDCTRL, 426 CDNS_MCP_CMDCTRL_INSERT_PARITY_ERR, 427 0); 428 429 /* commit changes */ 430 cdns_updatel(cdns, CDNS_MCP_CONFIG_UPDATE, 431 CDNS_MCP_CONFIG_UPDATE_BIT, 432 CDNS_MCP_CONFIG_UPDATE_BIT); 433 434 /* Continue bus operation with parity error injection disabled */ 435 mutex_unlock(&bus->bus_lock); 436 437 /* Userspace changed the hardware state behind the kernel's back */ 438 add_taint(TAINT_USER, LOCKDEP_STILL_OK); 439 440 /* 441 * allow Master device to enter pm_runtime suspend. This may 442 * also result in Slave devices suspending. 443 */ 444 pm_runtime_mark_last_busy(bus->dev); 445 pm_runtime_put_autosuspend(bus->dev); 446 447 return 0; 448 } 449 450 DEFINE_DEBUGFS_ATTRIBUTE(cdns_parity_error_fops, NULL, 451 cdns_parity_error_injection, "%llu\n"); 452 453 /** 454 * sdw_cdns_debugfs_init() - Cadence debugfs init 455 * @cdns: Cadence instance 456 * @root: debugfs root 457 */ 458 void sdw_cdns_debugfs_init(struct sdw_cdns *cdns, struct dentry *root) 459 { 460 debugfs_create_file("cdns-registers", 0400, root, cdns, &cdns_reg_fops); 461 462 debugfs_create_file("cdns-hw-reset", 0200, root, cdns, 463 &cdns_hw_reset_fops); 464 465 debugfs_create_file("cdns-parity-error-injection", 0200, root, cdns, 466 &cdns_parity_error_fops); 467 } 468 EXPORT_SYMBOL_GPL(sdw_cdns_debugfs_init); 469 470 #endif /* CONFIG_DEBUG_FS */ 471 472 /* 473 * IO Calls 474 */ 475 static enum sdw_command_response 476 cdns_fill_msg_resp(struct sdw_cdns *cdns, 477 struct sdw_msg *msg, int count, int offset) 478 { 479 int nack = 0, no_ack = 0; 480 int i; 481 482 /* check message response */ 483 for (i = 0; i < count; i++) { 484 if (!(cdns->response_buf[i] & CDNS_MCP_RESP_ACK)) { 485 no_ack = 1; 486 dev_dbg_ratelimited(cdns->dev, "Msg Ack not received\n"); 487 if (cdns->response_buf[i] & CDNS_MCP_RESP_NACK) { 488 nack = 1; 489 dev_err_ratelimited(cdns->dev, "Msg NACK received\n"); 490 } 491 } 492 } 493 494 if (nack) { 495 dev_err_ratelimited(cdns->dev, "Msg NACKed for Slave %d\n", msg->dev_num); 496 return SDW_CMD_FAIL; 497 } 498 499 if (no_ack) { 500 dev_dbg_ratelimited(cdns->dev, "Msg ignored for Slave %d\n", msg->dev_num); 501 return SDW_CMD_IGNORED; 502 } 503 504 /* fill response */ 505 for (i = 0; i < count; i++) 506 msg->buf[i + offset] = FIELD_GET(CDNS_MCP_RESP_RDATA, cdns->response_buf[i]); 507 508 return SDW_CMD_OK; 509 } 510 511 static enum sdw_command_response 512 _cdns_xfer_msg(struct sdw_cdns *cdns, struct sdw_msg *msg, int cmd, 513 int offset, int count, bool defer) 514 { 515 unsigned long time; 516 u32 base, i, data; 517 u16 addr; 518 519 /* Program the watermark level for RX FIFO */ 520 if (cdns->msg_count != count) { 521 cdns_writel(cdns, CDNS_MCP_FIFOLEVEL, count); 522 cdns->msg_count = count; 523 } 524 525 base = CDNS_MCP_CMD_BASE; 526 addr = msg->addr; 527 528 for (i = 0; i < count; i++) { 529 data = FIELD_PREP(CDNS_MCP_CMD_DEV_ADDR, msg->dev_num); 530 data |= FIELD_PREP(CDNS_MCP_CMD_COMMAND, cmd); 531 data |= FIELD_PREP(CDNS_MCP_CMD_REG_ADDR, addr); 532 addr++; 533 534 if (msg->flags == SDW_MSG_FLAG_WRITE) 535 data |= msg->buf[i + offset]; 536 537 data |= FIELD_PREP(CDNS_MCP_CMD_SSP_TAG, msg->ssp_sync); 538 cdns_writel(cdns, base, data); 539 base += CDNS_MCP_CMD_WORD_LEN; 540 } 541 542 if (defer) 543 return SDW_CMD_OK; 544 545 /* wait for timeout or response */ 546 time = wait_for_completion_timeout(&cdns->tx_complete, 547 msecs_to_jiffies(CDNS_TX_TIMEOUT)); 548 if (!time) { 549 dev_err(cdns->dev, "IO transfer timed out, cmd %d device %d addr %x len %d\n", 550 cmd, msg->dev_num, msg->addr, msg->len); 551 msg->len = 0; 552 return SDW_CMD_TIMEOUT; 553 } 554 555 return cdns_fill_msg_resp(cdns, msg, count, offset); 556 } 557 558 static enum sdw_command_response 559 cdns_program_scp_addr(struct sdw_cdns *cdns, struct sdw_msg *msg) 560 { 561 int nack = 0, no_ack = 0; 562 unsigned long time; 563 u32 data[2], base; 564 int i; 565 566 /* Program the watermark level for RX FIFO */ 567 if (cdns->msg_count != CDNS_SCP_RX_FIFOLEVEL) { 568 cdns_writel(cdns, CDNS_MCP_FIFOLEVEL, CDNS_SCP_RX_FIFOLEVEL); 569 cdns->msg_count = CDNS_SCP_RX_FIFOLEVEL; 570 } 571 572 data[0] = FIELD_PREP(CDNS_MCP_CMD_DEV_ADDR, msg->dev_num); 573 data[0] |= FIELD_PREP(CDNS_MCP_CMD_COMMAND, 0x3); 574 data[1] = data[0]; 575 576 data[0] |= FIELD_PREP(CDNS_MCP_CMD_REG_ADDR, SDW_SCP_ADDRPAGE1); 577 data[1] |= FIELD_PREP(CDNS_MCP_CMD_REG_ADDR, SDW_SCP_ADDRPAGE2); 578 579 data[0] |= msg->addr_page1; 580 data[1] |= msg->addr_page2; 581 582 base = CDNS_MCP_CMD_BASE; 583 cdns_writel(cdns, base, data[0]); 584 base += CDNS_MCP_CMD_WORD_LEN; 585 cdns_writel(cdns, base, data[1]); 586 587 time = wait_for_completion_timeout(&cdns->tx_complete, 588 msecs_to_jiffies(CDNS_TX_TIMEOUT)); 589 if (!time) { 590 dev_err(cdns->dev, "SCP Msg trf timed out\n"); 591 msg->len = 0; 592 return SDW_CMD_TIMEOUT; 593 } 594 595 /* check response the writes */ 596 for (i = 0; i < 2; i++) { 597 if (!(cdns->response_buf[i] & CDNS_MCP_RESP_ACK)) { 598 no_ack = 1; 599 dev_err(cdns->dev, "Program SCP Ack not received\n"); 600 if (cdns->response_buf[i] & CDNS_MCP_RESP_NACK) { 601 nack = 1; 602 dev_err(cdns->dev, "Program SCP NACK received\n"); 603 } 604 } 605 } 606 607 /* For NACK, NO ack, don't return err if we are in Broadcast mode */ 608 if (nack) { 609 dev_err_ratelimited(cdns->dev, 610 "SCP_addrpage NACKed for Slave %d\n", msg->dev_num); 611 return SDW_CMD_FAIL; 612 } 613 614 if (no_ack) { 615 dev_dbg_ratelimited(cdns->dev, 616 "SCP_addrpage ignored for Slave %d\n", msg->dev_num); 617 return SDW_CMD_IGNORED; 618 } 619 620 return SDW_CMD_OK; 621 } 622 623 static int cdns_prep_msg(struct sdw_cdns *cdns, struct sdw_msg *msg, int *cmd) 624 { 625 int ret; 626 627 if (msg->page) { 628 ret = cdns_program_scp_addr(cdns, msg); 629 if (ret) { 630 msg->len = 0; 631 return ret; 632 } 633 } 634 635 switch (msg->flags) { 636 case SDW_MSG_FLAG_READ: 637 *cmd = CDNS_MCP_CMD_READ; 638 break; 639 640 case SDW_MSG_FLAG_WRITE: 641 *cmd = CDNS_MCP_CMD_WRITE; 642 break; 643 644 default: 645 dev_err(cdns->dev, "Invalid msg cmd: %d\n", msg->flags); 646 return -EINVAL; 647 } 648 649 return 0; 650 } 651 652 enum sdw_command_response 653 cdns_xfer_msg(struct sdw_bus *bus, struct sdw_msg *msg) 654 { 655 struct sdw_cdns *cdns = bus_to_cdns(bus); 656 int cmd = 0, ret, i; 657 658 ret = cdns_prep_msg(cdns, msg, &cmd); 659 if (ret) 660 return SDW_CMD_FAIL_OTHER; 661 662 for (i = 0; i < msg->len / CDNS_MCP_CMD_LEN; i++) { 663 ret = _cdns_xfer_msg(cdns, msg, cmd, i * CDNS_MCP_CMD_LEN, 664 CDNS_MCP_CMD_LEN, false); 665 if (ret < 0) 666 goto exit; 667 } 668 669 if (!(msg->len % CDNS_MCP_CMD_LEN)) 670 goto exit; 671 672 ret = _cdns_xfer_msg(cdns, msg, cmd, i * CDNS_MCP_CMD_LEN, 673 msg->len % CDNS_MCP_CMD_LEN, false); 674 675 exit: 676 return ret; 677 } 678 EXPORT_SYMBOL(cdns_xfer_msg); 679 680 enum sdw_command_response 681 cdns_xfer_msg_defer(struct sdw_bus *bus, 682 struct sdw_msg *msg, struct sdw_defer *defer) 683 { 684 struct sdw_cdns *cdns = bus_to_cdns(bus); 685 int cmd = 0, ret; 686 687 /* for defer only 1 message is supported */ 688 if (msg->len > 1) 689 return -ENOTSUPP; 690 691 ret = cdns_prep_msg(cdns, msg, &cmd); 692 if (ret) 693 return SDW_CMD_FAIL_OTHER; 694 695 cdns->defer = defer; 696 cdns->defer->length = msg->len; 697 698 return _cdns_xfer_msg(cdns, msg, cmd, 0, msg->len, true); 699 } 700 EXPORT_SYMBOL(cdns_xfer_msg_defer); 701 702 enum sdw_command_response 703 cdns_reset_page_addr(struct sdw_bus *bus, unsigned int dev_num) 704 { 705 struct sdw_cdns *cdns = bus_to_cdns(bus); 706 struct sdw_msg msg; 707 708 /* Create dummy message with valid device number */ 709 memset(&msg, 0, sizeof(msg)); 710 msg.dev_num = dev_num; 711 712 return cdns_program_scp_addr(cdns, &msg); 713 } 714 EXPORT_SYMBOL(cdns_reset_page_addr); 715 716 /* 717 * IRQ handling 718 */ 719 720 static void cdns_read_response(struct sdw_cdns *cdns) 721 { 722 u32 num_resp, cmd_base; 723 int i; 724 725 num_resp = cdns_readl(cdns, CDNS_MCP_FIFOSTAT); 726 num_resp &= CDNS_MCP_RX_FIFO_AVAIL; 727 728 cmd_base = CDNS_MCP_CMD_BASE; 729 730 for (i = 0; i < num_resp; i++) { 731 cdns->response_buf[i] = cdns_readl(cdns, cmd_base); 732 cmd_base += CDNS_MCP_CMD_WORD_LEN; 733 } 734 } 735 736 static int cdns_update_slave_status(struct sdw_cdns *cdns, 737 u32 slave0, u32 slave1) 738 { 739 enum sdw_slave_status status[SDW_MAX_DEVICES + 1]; 740 bool is_slave = false; 741 u64 slave; 742 u32 mask; 743 int i, set_status; 744 745 /* combine the two status */ 746 slave = ((u64)slave1 << 32) | slave0; 747 memset(status, 0, sizeof(status)); 748 749 for (i = 0; i <= SDW_MAX_DEVICES; i++) { 750 mask = (slave >> (i * CDNS_MCP_SLAVE_STATUS_NUM)) & 751 CDNS_MCP_SLAVE_STATUS_BITS; 752 if (!mask) 753 continue; 754 755 is_slave = true; 756 set_status = 0; 757 758 if (mask & CDNS_MCP_SLAVE_INTSTAT_RESERVED) { 759 status[i] = SDW_SLAVE_RESERVED; 760 set_status++; 761 } 762 763 if (mask & CDNS_MCP_SLAVE_INTSTAT_ATTACHED) { 764 status[i] = SDW_SLAVE_ATTACHED; 765 set_status++; 766 } 767 768 if (mask & CDNS_MCP_SLAVE_INTSTAT_ALERT) { 769 status[i] = SDW_SLAVE_ALERT; 770 set_status++; 771 } 772 773 if (mask & CDNS_MCP_SLAVE_INTSTAT_NPRESENT) { 774 status[i] = SDW_SLAVE_UNATTACHED; 775 set_status++; 776 } 777 778 /* first check if Slave reported multiple status */ 779 if (set_status > 1) { 780 u32 val; 781 782 dev_warn_ratelimited(cdns->dev, 783 "Slave %d reported multiple Status: %d\n", 784 i, mask); 785 786 /* check latest status extracted from PING commands */ 787 val = cdns_readl(cdns, CDNS_MCP_SLAVE_STAT); 788 val >>= (i * 2); 789 790 switch (val & 0x3) { 791 case 0: 792 status[i] = SDW_SLAVE_UNATTACHED; 793 break; 794 case 1: 795 status[i] = SDW_SLAVE_ATTACHED; 796 break; 797 case 2: 798 status[i] = SDW_SLAVE_ALERT; 799 break; 800 case 3: 801 default: 802 status[i] = SDW_SLAVE_RESERVED; 803 break; 804 } 805 806 dev_warn_ratelimited(cdns->dev, 807 "Slave %d status updated to %d\n", 808 i, status[i]); 809 810 } 811 } 812 813 if (is_slave) 814 return sdw_handle_slave_status(&cdns->bus, status); 815 816 return 0; 817 } 818 819 /** 820 * sdw_cdns_irq() - Cadence interrupt handler 821 * @irq: irq number 822 * @dev_id: irq context 823 */ 824 irqreturn_t sdw_cdns_irq(int irq, void *dev_id) 825 { 826 struct sdw_cdns *cdns = dev_id; 827 u32 int_status; 828 int ret = IRQ_HANDLED; 829 830 /* Check if the link is up */ 831 if (!cdns->link_up) 832 return IRQ_NONE; 833 834 int_status = cdns_readl(cdns, CDNS_MCP_INTSTAT); 835 836 /* check for reserved values read as zero */ 837 if (int_status & CDNS_MCP_INT_RESERVED) 838 return IRQ_NONE; 839 840 if (!(int_status & CDNS_MCP_INT_IRQ)) 841 return IRQ_NONE; 842 843 if (int_status & CDNS_MCP_INT_RX_WL) { 844 cdns_read_response(cdns); 845 846 if (cdns->defer) { 847 cdns_fill_msg_resp(cdns, cdns->defer->msg, 848 cdns->defer->length, 0); 849 complete(&cdns->defer->complete); 850 cdns->defer = NULL; 851 } else { 852 complete(&cdns->tx_complete); 853 } 854 } 855 856 if (int_status & CDNS_MCP_INT_PARITY) { 857 /* Parity error detected by Master */ 858 dev_err_ratelimited(cdns->dev, "Parity error\n"); 859 } 860 861 if (int_status & CDNS_MCP_INT_CTRL_CLASH) { 862 /* Slave is driving bit slot during control word */ 863 dev_err_ratelimited(cdns->dev, "Bus clash for control word\n"); 864 } 865 866 if (int_status & CDNS_MCP_INT_DATA_CLASH) { 867 /* 868 * Multiple slaves trying to drive bit slot, or issue with 869 * ownership of data bits or Slave gone bonkers 870 */ 871 dev_err_ratelimited(cdns->dev, "Bus clash for data word\n"); 872 } 873 874 if (cdns->bus.params.m_data_mode != SDW_PORT_DATA_MODE_NORMAL && 875 int_status & CDNS_MCP_INT_DPINT) { 876 u32 port_intstat; 877 878 /* just log which ports report an error */ 879 port_intstat = cdns_readl(cdns, CDNS_MCP_PORT_INTSTAT); 880 dev_err_ratelimited(cdns->dev, "DP interrupt: PortIntStat %8x\n", 881 port_intstat); 882 883 /* clear status w/ write1 */ 884 cdns_writel(cdns, CDNS_MCP_PORT_INTSTAT, port_intstat); 885 } 886 887 if (int_status & CDNS_MCP_INT_SLAVE_MASK) { 888 /* Mask the Slave interrupt and wake thread */ 889 cdns_updatel(cdns, CDNS_MCP_INTMASK, 890 CDNS_MCP_INT_SLAVE_MASK, 0); 891 892 int_status &= ~CDNS_MCP_INT_SLAVE_MASK; 893 894 /* 895 * Deal with possible race condition between interrupt 896 * handling and disabling interrupts on suspend. 897 * 898 * If the master is in the process of disabling 899 * interrupts, don't schedule a workqueue 900 */ 901 if (cdns->interrupt_enabled) 902 schedule_work(&cdns->work); 903 } 904 905 cdns_writel(cdns, CDNS_MCP_INTSTAT, int_status); 906 return ret; 907 } 908 EXPORT_SYMBOL(sdw_cdns_irq); 909 910 /** 911 * To update slave status in a work since we will need to handle 912 * other interrupts eg. CDNS_MCP_INT_RX_WL during the update slave 913 * process. 914 * @work: cdns worker thread 915 */ 916 static void cdns_update_slave_status_work(struct work_struct *work) 917 { 918 struct sdw_cdns *cdns = 919 container_of(work, struct sdw_cdns, work); 920 u32 slave0, slave1; 921 922 dev_dbg_ratelimited(cdns->dev, "Slave status change\n"); 923 924 slave0 = cdns_readl(cdns, CDNS_MCP_SLAVE_INTSTAT0); 925 slave1 = cdns_readl(cdns, CDNS_MCP_SLAVE_INTSTAT1); 926 927 cdns_update_slave_status(cdns, slave0, slave1); 928 cdns_writel(cdns, CDNS_MCP_SLAVE_INTSTAT0, slave0); 929 cdns_writel(cdns, CDNS_MCP_SLAVE_INTSTAT1, slave1); 930 931 /* clear and unmask Slave interrupt now */ 932 cdns_writel(cdns, CDNS_MCP_INTSTAT, CDNS_MCP_INT_SLAVE_MASK); 933 cdns_updatel(cdns, CDNS_MCP_INTMASK, 934 CDNS_MCP_INT_SLAVE_MASK, CDNS_MCP_INT_SLAVE_MASK); 935 936 } 937 938 /* 939 * init routines 940 */ 941 942 /** 943 * sdw_cdns_exit_reset() - Program reset parameters and start bus operations 944 * @cdns: Cadence instance 945 */ 946 int sdw_cdns_exit_reset(struct sdw_cdns *cdns) 947 { 948 /* program maximum length reset to be safe */ 949 cdns_updatel(cdns, CDNS_MCP_CONTROL, 950 CDNS_MCP_CONTROL_RST_DELAY, 951 CDNS_MCP_CONTROL_RST_DELAY); 952 953 /* use hardware generated reset */ 954 cdns_updatel(cdns, CDNS_MCP_CONTROL, 955 CDNS_MCP_CONTROL_HW_RST, 956 CDNS_MCP_CONTROL_HW_RST); 957 958 /* commit changes */ 959 cdns_updatel(cdns, CDNS_MCP_CONFIG_UPDATE, 960 CDNS_MCP_CONFIG_UPDATE_BIT, 961 CDNS_MCP_CONFIG_UPDATE_BIT); 962 963 /* don't wait here */ 964 return 0; 965 966 } 967 EXPORT_SYMBOL(sdw_cdns_exit_reset); 968 969 /** 970 * sdw_cdns_enable_slave_interrupt() - Enable SDW slave interrupts 971 * @cdns: Cadence instance 972 * @state: boolean for true/false 973 */ 974 static void cdns_enable_slave_interrupts(struct sdw_cdns *cdns, bool state) 975 { 976 u32 mask; 977 978 mask = cdns_readl(cdns, CDNS_MCP_INTMASK); 979 if (state) 980 mask |= CDNS_MCP_INT_SLAVE_MASK; 981 else 982 mask &= ~CDNS_MCP_INT_SLAVE_MASK; 983 984 cdns_writel(cdns, CDNS_MCP_INTMASK, mask); 985 } 986 987 /** 988 * sdw_cdns_enable_interrupt() - Enable SDW interrupts 989 * @cdns: Cadence instance 990 * @state: True if we are trying to enable interrupt. 991 */ 992 int sdw_cdns_enable_interrupt(struct sdw_cdns *cdns, bool state) 993 { 994 u32 slave_intmask0 = 0; 995 u32 slave_intmask1 = 0; 996 u32 mask = 0; 997 998 if (!state) 999 goto update_masks; 1000 1001 slave_intmask0 = CDNS_MCP_SLAVE_INTMASK0_MASK; 1002 slave_intmask1 = CDNS_MCP_SLAVE_INTMASK1_MASK; 1003 1004 /* enable detection of all slave state changes */ 1005 mask = CDNS_MCP_INT_SLAVE_MASK; 1006 1007 /* enable detection of bus issues */ 1008 mask |= CDNS_MCP_INT_CTRL_CLASH | CDNS_MCP_INT_DATA_CLASH | 1009 CDNS_MCP_INT_PARITY; 1010 1011 /* port interrupt limited to test modes for now */ 1012 if (cdns->bus.params.m_data_mode != SDW_PORT_DATA_MODE_NORMAL) 1013 mask |= CDNS_MCP_INT_DPINT; 1014 1015 /* enable detection of RX fifo level */ 1016 mask |= CDNS_MCP_INT_RX_WL; 1017 1018 /* 1019 * CDNS_MCP_INT_IRQ needs to be set otherwise all previous 1020 * settings are irrelevant 1021 */ 1022 mask |= CDNS_MCP_INT_IRQ; 1023 1024 if (interrupt_mask) /* parameter override */ 1025 mask = interrupt_mask; 1026 1027 update_masks: 1028 /* clear slave interrupt status before enabling interrupt */ 1029 if (state) { 1030 u32 slave_state; 1031 1032 slave_state = cdns_readl(cdns, CDNS_MCP_SLAVE_INTSTAT0); 1033 cdns_writel(cdns, CDNS_MCP_SLAVE_INTSTAT0, slave_state); 1034 slave_state = cdns_readl(cdns, CDNS_MCP_SLAVE_INTSTAT1); 1035 cdns_writel(cdns, CDNS_MCP_SLAVE_INTSTAT1, slave_state); 1036 } 1037 cdns->interrupt_enabled = state; 1038 1039 /* 1040 * Complete any on-going status updates before updating masks, 1041 * and cancel queued status updates. 1042 * 1043 * There could be a race with a new interrupt thrown before 1044 * the 3 mask updates below are complete, so in the interrupt 1045 * we use the 'interrupt_enabled' status to prevent new work 1046 * from being queued. 1047 */ 1048 if (!state) 1049 cancel_work_sync(&cdns->work); 1050 1051 cdns_writel(cdns, CDNS_MCP_SLAVE_INTMASK0, slave_intmask0); 1052 cdns_writel(cdns, CDNS_MCP_SLAVE_INTMASK1, slave_intmask1); 1053 cdns_writel(cdns, CDNS_MCP_INTMASK, mask); 1054 1055 return 0; 1056 } 1057 EXPORT_SYMBOL(sdw_cdns_enable_interrupt); 1058 1059 static int cdns_allocate_pdi(struct sdw_cdns *cdns, 1060 struct sdw_cdns_pdi **stream, 1061 u32 num, u32 pdi_offset) 1062 { 1063 struct sdw_cdns_pdi *pdi; 1064 int i; 1065 1066 if (!num) 1067 return 0; 1068 1069 pdi = devm_kcalloc(cdns->dev, num, sizeof(*pdi), GFP_KERNEL); 1070 if (!pdi) 1071 return -ENOMEM; 1072 1073 for (i = 0; i < num; i++) { 1074 pdi[i].num = i + pdi_offset; 1075 } 1076 1077 *stream = pdi; 1078 return 0; 1079 } 1080 1081 /** 1082 * sdw_cdns_pdi_init() - PDI initialization routine 1083 * 1084 * @cdns: Cadence instance 1085 * @config: Stream configurations 1086 */ 1087 int sdw_cdns_pdi_init(struct sdw_cdns *cdns, 1088 struct sdw_cdns_stream_config config) 1089 { 1090 struct sdw_cdns_streams *stream; 1091 int offset; 1092 int ret; 1093 1094 cdns->pcm.num_bd = config.pcm_bd; 1095 cdns->pcm.num_in = config.pcm_in; 1096 cdns->pcm.num_out = config.pcm_out; 1097 cdns->pdm.num_bd = config.pdm_bd; 1098 cdns->pdm.num_in = config.pdm_in; 1099 cdns->pdm.num_out = config.pdm_out; 1100 1101 /* Allocate PDIs for PCMs */ 1102 stream = &cdns->pcm; 1103 1104 /* we allocate PDI0 and PDI1 which are used for Bulk */ 1105 offset = 0; 1106 1107 ret = cdns_allocate_pdi(cdns, &stream->bd, 1108 stream->num_bd, offset); 1109 if (ret) 1110 return ret; 1111 1112 offset += stream->num_bd; 1113 1114 ret = cdns_allocate_pdi(cdns, &stream->in, 1115 stream->num_in, offset); 1116 if (ret) 1117 return ret; 1118 1119 offset += stream->num_in; 1120 1121 ret = cdns_allocate_pdi(cdns, &stream->out, 1122 stream->num_out, offset); 1123 if (ret) 1124 return ret; 1125 1126 /* Update total number of PCM PDIs */ 1127 stream->num_pdi = stream->num_bd + stream->num_in + stream->num_out; 1128 cdns->num_ports = stream->num_pdi; 1129 1130 /* Allocate PDIs for PDMs */ 1131 stream = &cdns->pdm; 1132 ret = cdns_allocate_pdi(cdns, &stream->bd, 1133 stream->num_bd, offset); 1134 if (ret) 1135 return ret; 1136 1137 offset += stream->num_bd; 1138 1139 ret = cdns_allocate_pdi(cdns, &stream->in, 1140 stream->num_in, offset); 1141 if (ret) 1142 return ret; 1143 1144 offset += stream->num_in; 1145 1146 ret = cdns_allocate_pdi(cdns, &stream->out, 1147 stream->num_out, offset); 1148 1149 if (ret) 1150 return ret; 1151 1152 /* Update total number of PDM PDIs */ 1153 stream->num_pdi = stream->num_bd + stream->num_in + stream->num_out; 1154 cdns->num_ports += stream->num_pdi; 1155 1156 return 0; 1157 } 1158 EXPORT_SYMBOL(sdw_cdns_pdi_init); 1159 1160 static u32 cdns_set_initial_frame_shape(int n_rows, int n_cols) 1161 { 1162 u32 val; 1163 int c; 1164 int r; 1165 1166 r = sdw_find_row_index(n_rows); 1167 c = sdw_find_col_index(n_cols); 1168 1169 val = FIELD_PREP(CDNS_MCP_FRAME_SHAPE_ROW_MASK, r); 1170 val |= FIELD_PREP(CDNS_MCP_FRAME_SHAPE_COL_MASK, c); 1171 1172 return val; 1173 } 1174 1175 static void cdns_init_clock_ctrl(struct sdw_cdns *cdns) 1176 { 1177 struct sdw_bus *bus = &cdns->bus; 1178 struct sdw_master_prop *prop = &bus->prop; 1179 u32 val; 1180 u32 ssp_interval; 1181 int divider; 1182 1183 /* Set clock divider */ 1184 divider = (prop->mclk_freq / prop->max_clk_freq) - 1; 1185 1186 cdns_updatel(cdns, CDNS_MCP_CLK_CTRL0, 1187 CDNS_MCP_CLK_MCLKD_MASK, divider); 1188 cdns_updatel(cdns, CDNS_MCP_CLK_CTRL1, 1189 CDNS_MCP_CLK_MCLKD_MASK, divider); 1190 1191 /* 1192 * Frame shape changes after initialization have to be done 1193 * with the bank switch mechanism 1194 */ 1195 val = cdns_set_initial_frame_shape(prop->default_row, 1196 prop->default_col); 1197 cdns_writel(cdns, CDNS_MCP_FRAME_SHAPE_INIT, val); 1198 1199 /* Set SSP interval to default value */ 1200 ssp_interval = prop->default_frame_rate / SDW_CADENCE_GSYNC_HZ; 1201 cdns_writel(cdns, CDNS_MCP_SSP_CTRL0, ssp_interval); 1202 cdns_writel(cdns, CDNS_MCP_SSP_CTRL1, ssp_interval); 1203 } 1204 1205 /** 1206 * sdw_cdns_init() - Cadence initialization 1207 * @cdns: Cadence instance 1208 */ 1209 int sdw_cdns_init(struct sdw_cdns *cdns) 1210 { 1211 u32 val; 1212 1213 cdns_init_clock_ctrl(cdns); 1214 1215 /* reset msg_count to default value of FIFOLEVEL */ 1216 cdns->msg_count = cdns_readl(cdns, CDNS_MCP_FIFOLEVEL); 1217 1218 /* flush command FIFOs */ 1219 cdns_updatel(cdns, CDNS_MCP_CONTROL, CDNS_MCP_CONTROL_CMD_RST, 1220 CDNS_MCP_CONTROL_CMD_RST); 1221 1222 /* Set cmd accept mode */ 1223 cdns_updatel(cdns, CDNS_MCP_CONTROL, CDNS_MCP_CONTROL_CMD_ACCEPT, 1224 CDNS_MCP_CONTROL_CMD_ACCEPT); 1225 1226 /* Configure mcp config */ 1227 val = cdns_readl(cdns, CDNS_MCP_CONFIG); 1228 1229 /* enable bus operations with clock and data */ 1230 val &= ~CDNS_MCP_CONFIG_OP; 1231 val |= CDNS_MCP_CONFIG_OP_NORMAL; 1232 1233 /* Set cmd mode for Tx and Rx cmds */ 1234 val &= ~CDNS_MCP_CONFIG_CMD; 1235 1236 /* Disable sniffer mode */ 1237 val &= ~CDNS_MCP_CONFIG_SNIFFER; 1238 1239 /* Disable auto bus release */ 1240 val &= ~CDNS_MCP_CONFIG_BUS_REL; 1241 1242 if (cdns->bus.multi_link) 1243 /* Set Multi-master mode to take gsync into account */ 1244 val |= CDNS_MCP_CONFIG_MMASTER; 1245 1246 /* leave frame delay to hardware default of 0x1F */ 1247 1248 /* leave command retry to hardware default of 0 */ 1249 1250 cdns_writel(cdns, CDNS_MCP_CONFIG, val); 1251 1252 /* changes will be committed later */ 1253 return 0; 1254 } 1255 EXPORT_SYMBOL(sdw_cdns_init); 1256 1257 int cdns_bus_conf(struct sdw_bus *bus, struct sdw_bus_params *params) 1258 { 1259 struct sdw_master_prop *prop = &bus->prop; 1260 struct sdw_cdns *cdns = bus_to_cdns(bus); 1261 int mcp_clkctrl_off; 1262 int divider; 1263 1264 if (!params->curr_dr_freq) { 1265 dev_err(cdns->dev, "NULL curr_dr_freq\n"); 1266 return -EINVAL; 1267 } 1268 1269 divider = prop->mclk_freq * SDW_DOUBLE_RATE_FACTOR / 1270 params->curr_dr_freq; 1271 divider--; /* divider is 1/(N+1) */ 1272 1273 if (params->next_bank) 1274 mcp_clkctrl_off = CDNS_MCP_CLK_CTRL1; 1275 else 1276 mcp_clkctrl_off = CDNS_MCP_CLK_CTRL0; 1277 1278 cdns_updatel(cdns, mcp_clkctrl_off, CDNS_MCP_CLK_MCLKD_MASK, divider); 1279 1280 return 0; 1281 } 1282 EXPORT_SYMBOL(cdns_bus_conf); 1283 1284 static int cdns_port_params(struct sdw_bus *bus, 1285 struct sdw_port_params *p_params, unsigned int bank) 1286 { 1287 struct sdw_cdns *cdns = bus_to_cdns(bus); 1288 int dpn_config = 0, dpn_config_off; 1289 1290 if (bank) 1291 dpn_config_off = CDNS_DPN_B1_CONFIG(p_params->num); 1292 else 1293 dpn_config_off = CDNS_DPN_B0_CONFIG(p_params->num); 1294 1295 dpn_config = cdns_readl(cdns, dpn_config_off); 1296 1297 u32p_replace_bits(&dpn_config, (p_params->bps - 1), CDNS_DPN_CONFIG_WL); 1298 u32p_replace_bits(&dpn_config, p_params->flow_mode, CDNS_DPN_CONFIG_PORT_FLOW); 1299 u32p_replace_bits(&dpn_config, p_params->data_mode, CDNS_DPN_CONFIG_PORT_DAT); 1300 1301 cdns_writel(cdns, dpn_config_off, dpn_config); 1302 1303 return 0; 1304 } 1305 1306 static int cdns_transport_params(struct sdw_bus *bus, 1307 struct sdw_transport_params *t_params, 1308 enum sdw_reg_bank bank) 1309 { 1310 struct sdw_cdns *cdns = bus_to_cdns(bus); 1311 int dpn_offsetctrl = 0, dpn_offsetctrl_off; 1312 int dpn_config = 0, dpn_config_off; 1313 int dpn_hctrl = 0, dpn_hctrl_off; 1314 int num = t_params->port_num; 1315 int dpn_samplectrl_off; 1316 1317 /* 1318 * Note: Only full data port is supported on the Master side for 1319 * both PCM and PDM ports. 1320 */ 1321 1322 if (bank) { 1323 dpn_config_off = CDNS_DPN_B1_CONFIG(num); 1324 dpn_samplectrl_off = CDNS_DPN_B1_SAMPLE_CTRL(num); 1325 dpn_hctrl_off = CDNS_DPN_B1_HCTRL(num); 1326 dpn_offsetctrl_off = CDNS_DPN_B1_OFFSET_CTRL(num); 1327 } else { 1328 dpn_config_off = CDNS_DPN_B0_CONFIG(num); 1329 dpn_samplectrl_off = CDNS_DPN_B0_SAMPLE_CTRL(num); 1330 dpn_hctrl_off = CDNS_DPN_B0_HCTRL(num); 1331 dpn_offsetctrl_off = CDNS_DPN_B0_OFFSET_CTRL(num); 1332 } 1333 1334 dpn_config = cdns_readl(cdns, dpn_config_off); 1335 u32p_replace_bits(&dpn_config, t_params->blk_grp_ctrl, CDNS_DPN_CONFIG_BGC); 1336 u32p_replace_bits(&dpn_config, t_params->blk_pkg_mode, CDNS_DPN_CONFIG_BPM); 1337 cdns_writel(cdns, dpn_config_off, dpn_config); 1338 1339 u32p_replace_bits(&dpn_offsetctrl, t_params->offset1, CDNS_DPN_OFFSET_CTRL_1); 1340 u32p_replace_bits(&dpn_offsetctrl, t_params->offset2, CDNS_DPN_OFFSET_CTRL_2); 1341 cdns_writel(cdns, dpn_offsetctrl_off, dpn_offsetctrl); 1342 1343 u32p_replace_bits(&dpn_hctrl, t_params->hstart, CDNS_DPN_HCTRL_HSTART); 1344 u32p_replace_bits(&dpn_hctrl, t_params->hstop, CDNS_DPN_HCTRL_HSTOP); 1345 u32p_replace_bits(&dpn_hctrl, t_params->lane_ctrl, CDNS_DPN_HCTRL_LCTRL); 1346 1347 cdns_writel(cdns, dpn_hctrl_off, dpn_hctrl); 1348 cdns_writel(cdns, dpn_samplectrl_off, (t_params->sample_interval - 1)); 1349 1350 return 0; 1351 } 1352 1353 static int cdns_port_enable(struct sdw_bus *bus, 1354 struct sdw_enable_ch *enable_ch, unsigned int bank) 1355 { 1356 struct sdw_cdns *cdns = bus_to_cdns(bus); 1357 int dpn_chnen_off, ch_mask; 1358 1359 if (bank) 1360 dpn_chnen_off = CDNS_DPN_B1_CH_EN(enable_ch->port_num); 1361 else 1362 dpn_chnen_off = CDNS_DPN_B0_CH_EN(enable_ch->port_num); 1363 1364 ch_mask = enable_ch->ch_mask * enable_ch->enable; 1365 cdns_writel(cdns, dpn_chnen_off, ch_mask); 1366 1367 return 0; 1368 } 1369 1370 static const struct sdw_master_port_ops cdns_port_ops = { 1371 .dpn_set_port_params = cdns_port_params, 1372 .dpn_set_port_transport_params = cdns_transport_params, 1373 .dpn_port_enable_ch = cdns_port_enable, 1374 }; 1375 1376 /** 1377 * sdw_cdns_is_clock_stop: Check clock status 1378 * 1379 * @cdns: Cadence instance 1380 */ 1381 bool sdw_cdns_is_clock_stop(struct sdw_cdns *cdns) 1382 { 1383 return !!(cdns_readl(cdns, CDNS_MCP_STAT) & CDNS_MCP_STAT_CLK_STOP); 1384 } 1385 EXPORT_SYMBOL(sdw_cdns_is_clock_stop); 1386 1387 /** 1388 * sdw_cdns_clock_stop: Cadence clock stop configuration routine 1389 * 1390 * @cdns: Cadence instance 1391 * @block_wake: prevent wakes if required by the platform 1392 */ 1393 int sdw_cdns_clock_stop(struct sdw_cdns *cdns, bool block_wake) 1394 { 1395 bool slave_present = false; 1396 struct sdw_slave *slave; 1397 int ret; 1398 1399 /* Check suspend status */ 1400 if (sdw_cdns_is_clock_stop(cdns)) { 1401 dev_dbg(cdns->dev, "Clock is already stopped\n"); 1402 return 0; 1403 } 1404 1405 /* 1406 * Before entering clock stop we mask the Slave 1407 * interrupts. This helps avoid having to deal with e.g. a 1408 * Slave becoming UNATTACHED while the clock is being stopped 1409 */ 1410 cdns_enable_slave_interrupts(cdns, false); 1411 1412 /* 1413 * For specific platforms, it is required to be able to put 1414 * master into a state in which it ignores wake-up trials 1415 * in clock stop state 1416 */ 1417 if (block_wake) 1418 cdns_updatel(cdns, CDNS_MCP_CONTROL, 1419 CDNS_MCP_CONTROL_BLOCK_WAKEUP, 1420 CDNS_MCP_CONTROL_BLOCK_WAKEUP); 1421 1422 list_for_each_entry(slave, &cdns->bus.slaves, node) { 1423 if (slave->status == SDW_SLAVE_ATTACHED || 1424 slave->status == SDW_SLAVE_ALERT) { 1425 slave_present = true; 1426 break; 1427 } 1428 } 1429 1430 /* 1431 * This CMD_ACCEPT should be used when there are no devices 1432 * attached on the link when entering clock stop mode. If this is 1433 * not set and there is a broadcast write then the command ignored 1434 * will be treated as a failure 1435 */ 1436 if (!slave_present) 1437 cdns_updatel(cdns, CDNS_MCP_CONTROL, 1438 CDNS_MCP_CONTROL_CMD_ACCEPT, 1439 CDNS_MCP_CONTROL_CMD_ACCEPT); 1440 else 1441 cdns_updatel(cdns, CDNS_MCP_CONTROL, 1442 CDNS_MCP_CONTROL_CMD_ACCEPT, 0); 1443 1444 /* commit changes */ 1445 ret = cdns_config_update(cdns); 1446 if (ret < 0) { 1447 dev_err(cdns->dev, "%s: config_update failed\n", __func__); 1448 return ret; 1449 } 1450 1451 /* Prepare slaves for clock stop */ 1452 ret = sdw_bus_prep_clk_stop(&cdns->bus); 1453 if (ret < 0) { 1454 dev_err(cdns->dev, "prepare clock stop failed %d", ret); 1455 return ret; 1456 } 1457 1458 /* 1459 * Enter clock stop mode and only report errors if there are 1460 * Slave devices present (ALERT or ATTACHED) 1461 */ 1462 ret = sdw_bus_clk_stop(&cdns->bus); 1463 if (ret < 0 && slave_present && ret != -ENODATA) { 1464 dev_err(cdns->dev, "bus clock stop failed %d", ret); 1465 return ret; 1466 } 1467 1468 ret = cdns_set_wait(cdns, CDNS_MCP_STAT, 1469 CDNS_MCP_STAT_CLK_STOP, 1470 CDNS_MCP_STAT_CLK_STOP); 1471 if (ret < 0) 1472 dev_err(cdns->dev, "Clock stop failed %d\n", ret); 1473 1474 return ret; 1475 } 1476 EXPORT_SYMBOL(sdw_cdns_clock_stop); 1477 1478 /** 1479 * sdw_cdns_clock_restart: Cadence PM clock restart configuration routine 1480 * 1481 * @cdns: Cadence instance 1482 * @bus_reset: context may be lost while in low power modes and the bus 1483 * may require a Severe Reset and re-enumeration after a wake. 1484 */ 1485 int sdw_cdns_clock_restart(struct sdw_cdns *cdns, bool bus_reset) 1486 { 1487 int ret; 1488 1489 /* unmask Slave interrupts that were masked when stopping the clock */ 1490 cdns_enable_slave_interrupts(cdns, true); 1491 1492 ret = cdns_clear_bit(cdns, CDNS_MCP_CONTROL, 1493 CDNS_MCP_CONTROL_CLK_STOP_CLR); 1494 if (ret < 0) { 1495 dev_err(cdns->dev, "Couldn't exit from clock stop\n"); 1496 return ret; 1497 } 1498 1499 ret = cdns_set_wait(cdns, CDNS_MCP_STAT, CDNS_MCP_STAT_CLK_STOP, 0); 1500 if (ret < 0) { 1501 dev_err(cdns->dev, "clock stop exit failed %d\n", ret); 1502 return ret; 1503 } 1504 1505 cdns_updatel(cdns, CDNS_MCP_CONTROL, 1506 CDNS_MCP_CONTROL_BLOCK_WAKEUP, 0); 1507 1508 /* 1509 * clear CMD_ACCEPT so that the command ignored 1510 * will be treated as a failure during a broadcast write 1511 */ 1512 cdns_updatel(cdns, CDNS_MCP_CONTROL, CDNS_MCP_CONTROL_CMD_ACCEPT, 0); 1513 1514 if (!bus_reset) { 1515 1516 /* enable bus operations with clock and data */ 1517 cdns_updatel(cdns, CDNS_MCP_CONFIG, 1518 CDNS_MCP_CONFIG_OP, 1519 CDNS_MCP_CONFIG_OP_NORMAL); 1520 1521 ret = cdns_config_update(cdns); 1522 if (ret < 0) { 1523 dev_err(cdns->dev, "%s: config_update failed\n", __func__); 1524 return ret; 1525 } 1526 1527 ret = sdw_bus_exit_clk_stop(&cdns->bus); 1528 if (ret < 0) 1529 dev_err(cdns->dev, "bus failed to exit clock stop %d\n", ret); 1530 } 1531 1532 return ret; 1533 } 1534 EXPORT_SYMBOL(sdw_cdns_clock_restart); 1535 1536 /** 1537 * sdw_cdns_probe() - Cadence probe routine 1538 * @cdns: Cadence instance 1539 */ 1540 int sdw_cdns_probe(struct sdw_cdns *cdns) 1541 { 1542 init_completion(&cdns->tx_complete); 1543 cdns->bus.port_ops = &cdns_port_ops; 1544 1545 INIT_WORK(&cdns->work, cdns_update_slave_status_work); 1546 return 0; 1547 } 1548 EXPORT_SYMBOL(sdw_cdns_probe); 1549 1550 int cdns_set_sdw_stream(struct snd_soc_dai *dai, 1551 void *stream, bool pcm, int direction) 1552 { 1553 struct sdw_cdns *cdns = snd_soc_dai_get_drvdata(dai); 1554 struct sdw_cdns_dma_data *dma; 1555 1556 if (stream) { 1557 /* first paranoia check */ 1558 if (direction == SNDRV_PCM_STREAM_PLAYBACK) 1559 dma = dai->playback_dma_data; 1560 else 1561 dma = dai->capture_dma_data; 1562 1563 if (dma) { 1564 dev_err(dai->dev, 1565 "dma_data already allocated for dai %s\n", 1566 dai->name); 1567 return -EINVAL; 1568 } 1569 1570 /* allocate and set dma info */ 1571 dma = kzalloc(sizeof(*dma), GFP_KERNEL); 1572 if (!dma) 1573 return -ENOMEM; 1574 1575 if (pcm) 1576 dma->stream_type = SDW_STREAM_PCM; 1577 else 1578 dma->stream_type = SDW_STREAM_PDM; 1579 1580 dma->bus = &cdns->bus; 1581 dma->link_id = cdns->instance; 1582 1583 dma->stream = stream; 1584 1585 if (direction == SNDRV_PCM_STREAM_PLAYBACK) 1586 dai->playback_dma_data = dma; 1587 else 1588 dai->capture_dma_data = dma; 1589 } else { 1590 /* for NULL stream we release allocated dma_data */ 1591 if (direction == SNDRV_PCM_STREAM_PLAYBACK) { 1592 kfree(dai->playback_dma_data); 1593 dai->playback_dma_data = NULL; 1594 } else { 1595 kfree(dai->capture_dma_data); 1596 dai->capture_dma_data = NULL; 1597 } 1598 } 1599 return 0; 1600 } 1601 EXPORT_SYMBOL(cdns_set_sdw_stream); 1602 1603 /** 1604 * cdns_find_pdi() - Find a free PDI 1605 * 1606 * @cdns: Cadence instance 1607 * @offset: Starting offset 1608 * @num: Number of PDIs 1609 * @pdi: PDI instances 1610 * @dai_id: DAI id 1611 * 1612 * Find a PDI for a given PDI array. The PDI num and dai_id are 1613 * expected to match, return NULL otherwise. 1614 */ 1615 static struct sdw_cdns_pdi *cdns_find_pdi(struct sdw_cdns *cdns, 1616 unsigned int offset, 1617 unsigned int num, 1618 struct sdw_cdns_pdi *pdi, 1619 int dai_id) 1620 { 1621 int i; 1622 1623 for (i = offset; i < offset + num; i++) 1624 if (pdi[i].num == dai_id) 1625 return &pdi[i]; 1626 1627 return NULL; 1628 } 1629 1630 /** 1631 * sdw_cdns_config_stream: Configure a stream 1632 * 1633 * @cdns: Cadence instance 1634 * @ch: Channel count 1635 * @dir: Data direction 1636 * @pdi: PDI to be used 1637 */ 1638 void sdw_cdns_config_stream(struct sdw_cdns *cdns, 1639 u32 ch, u32 dir, struct sdw_cdns_pdi *pdi) 1640 { 1641 u32 offset, val = 0; 1642 1643 if (dir == SDW_DATA_DIR_RX) { 1644 val = CDNS_PORTCTRL_DIRN; 1645 1646 if (cdns->bus.params.m_data_mode != SDW_PORT_DATA_MODE_NORMAL) 1647 val |= CDNS_PORTCTRL_TEST_FAILED; 1648 } 1649 offset = CDNS_PORTCTRL + pdi->num * CDNS_PORT_OFFSET; 1650 cdns_updatel(cdns, offset, 1651 CDNS_PORTCTRL_DIRN | CDNS_PORTCTRL_TEST_FAILED, 1652 val); 1653 1654 val = pdi->num; 1655 val |= CDNS_PDI_CONFIG_SOFT_RESET; 1656 val |= FIELD_PREP(CDNS_PDI_CONFIG_CHANNEL, (1 << ch) - 1); 1657 cdns_writel(cdns, CDNS_PDI_CONFIG(pdi->num), val); 1658 } 1659 EXPORT_SYMBOL(sdw_cdns_config_stream); 1660 1661 /** 1662 * sdw_cdns_alloc_pdi() - Allocate a PDI 1663 * 1664 * @cdns: Cadence instance 1665 * @stream: Stream to be allocated 1666 * @ch: Channel count 1667 * @dir: Data direction 1668 * @dai_id: DAI id 1669 */ 1670 struct sdw_cdns_pdi *sdw_cdns_alloc_pdi(struct sdw_cdns *cdns, 1671 struct sdw_cdns_streams *stream, 1672 u32 ch, u32 dir, int dai_id) 1673 { 1674 struct sdw_cdns_pdi *pdi = NULL; 1675 1676 if (dir == SDW_DATA_DIR_RX) 1677 pdi = cdns_find_pdi(cdns, 0, stream->num_in, stream->in, 1678 dai_id); 1679 else 1680 pdi = cdns_find_pdi(cdns, 0, stream->num_out, stream->out, 1681 dai_id); 1682 1683 /* check if we found a PDI, else find in bi-directional */ 1684 if (!pdi) 1685 pdi = cdns_find_pdi(cdns, 2, stream->num_bd, stream->bd, 1686 dai_id); 1687 1688 if (pdi) { 1689 pdi->l_ch_num = 0; 1690 pdi->h_ch_num = ch - 1; 1691 pdi->dir = dir; 1692 pdi->ch_count = ch; 1693 } 1694 1695 return pdi; 1696 } 1697 EXPORT_SYMBOL(sdw_cdns_alloc_pdi); 1698 1699 MODULE_LICENSE("Dual BSD/GPL"); 1700 MODULE_DESCRIPTION("Cadence Soundwire Library"); 1701