1 // SPDX-License-Identifier: (GPL-2.0 OR BSD-3-Clause) 2 // Copyright(c) 2015-17 Intel Corporation. 3 4 /* 5 * Cadence SoundWire Master module 6 * Used by Master driver 7 */ 8 9 #include <linux/delay.h> 10 #include <linux/device.h> 11 #include <linux/debugfs.h> 12 #include <linux/interrupt.h> 13 #include <linux/io.h> 14 #include <linux/module.h> 15 #include <linux/mod_devicetable.h> 16 #include <linux/pm_runtime.h> 17 #include <linux/soundwire/sdw_registers.h> 18 #include <linux/soundwire/sdw.h> 19 #include <sound/pcm_params.h> 20 #include <sound/soc.h> 21 #include <linux/workqueue.h> 22 #include "bus.h" 23 #include "cadence_master.h" 24 25 static int interrupt_mask; 26 module_param_named(cnds_mcp_int_mask, interrupt_mask, int, 0444); 27 MODULE_PARM_DESC(cdns_mcp_int_mask, "Cadence MCP IntMask"); 28 29 #define CDNS_MCP_CONFIG 0x0 30 31 #define CDNS_MCP_CONFIG_MCMD_RETRY GENMASK(27, 24) 32 #define CDNS_MCP_CONFIG_MPREQ_DELAY GENMASK(20, 16) 33 #define CDNS_MCP_CONFIG_MMASTER BIT(7) 34 #define CDNS_MCP_CONFIG_BUS_REL BIT(6) 35 #define CDNS_MCP_CONFIG_SNIFFER BIT(5) 36 #define CDNS_MCP_CONFIG_SSPMOD BIT(4) 37 #define CDNS_MCP_CONFIG_CMD BIT(3) 38 #define CDNS_MCP_CONFIG_OP GENMASK(2, 0) 39 #define CDNS_MCP_CONFIG_OP_NORMAL 0 40 41 #define CDNS_MCP_CONTROL 0x4 42 43 #define CDNS_MCP_CONTROL_RST_DELAY GENMASK(10, 8) 44 #define CDNS_MCP_CONTROL_CMD_RST BIT(7) 45 #define CDNS_MCP_CONTROL_SOFT_RST BIT(6) 46 #define CDNS_MCP_CONTROL_SW_RST BIT(5) 47 #define CDNS_MCP_CONTROL_HW_RST BIT(4) 48 #define CDNS_MCP_CONTROL_CLK_PAUSE BIT(3) 49 #define CDNS_MCP_CONTROL_CLK_STOP_CLR BIT(2) 50 #define CDNS_MCP_CONTROL_CMD_ACCEPT BIT(1) 51 #define CDNS_MCP_CONTROL_BLOCK_WAKEUP BIT(0) 52 53 #define CDNS_MCP_CMDCTRL 0x8 54 55 #define CDNS_MCP_CMDCTRL_INSERT_PARITY_ERR BIT(2) 56 57 #define CDNS_MCP_SSPSTAT 0xC 58 #define CDNS_MCP_FRAME_SHAPE 0x10 59 #define CDNS_MCP_FRAME_SHAPE_INIT 0x14 60 #define CDNS_MCP_FRAME_SHAPE_COL_MASK GENMASK(2, 0) 61 #define CDNS_MCP_FRAME_SHAPE_ROW_MASK GENMASK(7, 3) 62 63 #define CDNS_MCP_CONFIG_UPDATE 0x18 64 #define CDNS_MCP_CONFIG_UPDATE_BIT BIT(0) 65 66 #define CDNS_MCP_PHYCTRL 0x1C 67 #define CDNS_MCP_SSP_CTRL0 0x20 68 #define CDNS_MCP_SSP_CTRL1 0x28 69 #define CDNS_MCP_CLK_CTRL0 0x30 70 #define CDNS_MCP_CLK_CTRL1 0x38 71 #define CDNS_MCP_CLK_MCLKD_MASK GENMASK(7, 0) 72 73 #define CDNS_MCP_STAT 0x40 74 75 #define CDNS_MCP_STAT_ACTIVE_BANK BIT(20) 76 #define CDNS_MCP_STAT_CLK_STOP BIT(16) 77 78 #define CDNS_MCP_INTSTAT 0x44 79 #define CDNS_MCP_INTMASK 0x48 80 81 #define CDNS_MCP_INT_IRQ BIT(31) 82 #define CDNS_MCP_INT_RESERVED1 GENMASK(30, 17) 83 #define CDNS_MCP_INT_WAKEUP BIT(16) 84 #define CDNS_MCP_INT_SLAVE_RSVD BIT(15) 85 #define CDNS_MCP_INT_SLAVE_ALERT BIT(14) 86 #define CDNS_MCP_INT_SLAVE_ATTACH BIT(13) 87 #define CDNS_MCP_INT_SLAVE_NATTACH BIT(12) 88 #define CDNS_MCP_INT_SLAVE_MASK GENMASK(15, 12) 89 #define CDNS_MCP_INT_DPINT BIT(11) 90 #define CDNS_MCP_INT_CTRL_CLASH BIT(10) 91 #define CDNS_MCP_INT_DATA_CLASH BIT(9) 92 #define CDNS_MCP_INT_PARITY BIT(8) 93 #define CDNS_MCP_INT_CMD_ERR BIT(7) 94 #define CDNS_MCP_INT_RESERVED2 GENMASK(6, 4) 95 #define CDNS_MCP_INT_RX_NE BIT(3) 96 #define CDNS_MCP_INT_RX_WL BIT(2) 97 #define CDNS_MCP_INT_TXE BIT(1) 98 #define CDNS_MCP_INT_TXF BIT(0) 99 #define CDNS_MCP_INT_RESERVED (CDNS_MCP_INT_RESERVED1 | CDNS_MCP_INT_RESERVED2) 100 101 #define CDNS_MCP_INTSET 0x4C 102 103 #define CDNS_MCP_SLAVE_STAT 0x50 104 #define CDNS_MCP_SLAVE_STAT_MASK GENMASK(1, 0) 105 106 #define CDNS_MCP_SLAVE_INTSTAT0 0x54 107 #define CDNS_MCP_SLAVE_INTSTAT1 0x58 108 #define CDNS_MCP_SLAVE_INTSTAT_NPRESENT BIT(0) 109 #define CDNS_MCP_SLAVE_INTSTAT_ATTACHED BIT(1) 110 #define CDNS_MCP_SLAVE_INTSTAT_ALERT BIT(2) 111 #define CDNS_MCP_SLAVE_INTSTAT_RESERVED BIT(3) 112 #define CDNS_MCP_SLAVE_STATUS_BITS GENMASK(3, 0) 113 #define CDNS_MCP_SLAVE_STATUS_NUM 4 114 115 #define CDNS_MCP_SLAVE_INTMASK0 0x5C 116 #define CDNS_MCP_SLAVE_INTMASK1 0x60 117 118 #define CDNS_MCP_SLAVE_INTMASK0_MASK GENMASK(31, 0) 119 #define CDNS_MCP_SLAVE_INTMASK1_MASK GENMASK(15, 0) 120 121 #define CDNS_MCP_PORT_INTSTAT 0x64 122 #define CDNS_MCP_PDI_STAT 0x6C 123 124 #define CDNS_MCP_FIFOLEVEL 0x78 125 #define CDNS_MCP_FIFOSTAT 0x7C 126 #define CDNS_MCP_RX_FIFO_AVAIL GENMASK(5, 0) 127 128 #define CDNS_MCP_CMD_BASE 0x80 129 #define CDNS_MCP_RESP_BASE 0x80 130 #define CDNS_MCP_CMD_LEN 0x20 131 #define CDNS_MCP_CMD_WORD_LEN 0x4 132 133 #define CDNS_MCP_CMD_SSP_TAG BIT(31) 134 #define CDNS_MCP_CMD_COMMAND GENMASK(30, 28) 135 #define CDNS_MCP_CMD_DEV_ADDR GENMASK(27, 24) 136 #define CDNS_MCP_CMD_REG_ADDR GENMASK(23, 8) 137 #define CDNS_MCP_CMD_REG_DATA GENMASK(7, 0) 138 139 #define CDNS_MCP_CMD_READ 2 140 #define CDNS_MCP_CMD_WRITE 3 141 142 #define CDNS_MCP_RESP_RDATA GENMASK(15, 8) 143 #define CDNS_MCP_RESP_ACK BIT(0) 144 #define CDNS_MCP_RESP_NACK BIT(1) 145 146 #define CDNS_DP_SIZE 128 147 148 #define CDNS_DPN_B0_CONFIG(n) (0x100 + CDNS_DP_SIZE * (n)) 149 #define CDNS_DPN_B0_CH_EN(n) (0x104 + CDNS_DP_SIZE * (n)) 150 #define CDNS_DPN_B0_SAMPLE_CTRL(n) (0x108 + CDNS_DP_SIZE * (n)) 151 #define CDNS_DPN_B0_OFFSET_CTRL(n) (0x10C + CDNS_DP_SIZE * (n)) 152 #define CDNS_DPN_B0_HCTRL(n) (0x110 + CDNS_DP_SIZE * (n)) 153 #define CDNS_DPN_B0_ASYNC_CTRL(n) (0x114 + CDNS_DP_SIZE * (n)) 154 155 #define CDNS_DPN_B1_CONFIG(n) (0x118 + CDNS_DP_SIZE * (n)) 156 #define CDNS_DPN_B1_CH_EN(n) (0x11C + CDNS_DP_SIZE * (n)) 157 #define CDNS_DPN_B1_SAMPLE_CTRL(n) (0x120 + CDNS_DP_SIZE * (n)) 158 #define CDNS_DPN_B1_OFFSET_CTRL(n) (0x124 + CDNS_DP_SIZE * (n)) 159 #define CDNS_DPN_B1_HCTRL(n) (0x128 + CDNS_DP_SIZE * (n)) 160 #define CDNS_DPN_B1_ASYNC_CTRL(n) (0x12C + CDNS_DP_SIZE * (n)) 161 162 #define CDNS_DPN_CONFIG_BPM BIT(18) 163 #define CDNS_DPN_CONFIG_BGC GENMASK(17, 16) 164 #define CDNS_DPN_CONFIG_WL GENMASK(12, 8) 165 #define CDNS_DPN_CONFIG_PORT_DAT GENMASK(3, 2) 166 #define CDNS_DPN_CONFIG_PORT_FLOW GENMASK(1, 0) 167 168 #define CDNS_DPN_SAMPLE_CTRL_SI GENMASK(15, 0) 169 170 #define CDNS_DPN_OFFSET_CTRL_1 GENMASK(7, 0) 171 #define CDNS_DPN_OFFSET_CTRL_2 GENMASK(15, 8) 172 173 #define CDNS_DPN_HCTRL_HSTOP GENMASK(3, 0) 174 #define CDNS_DPN_HCTRL_HSTART GENMASK(7, 4) 175 #define CDNS_DPN_HCTRL_LCTRL GENMASK(10, 8) 176 177 #define CDNS_PORTCTRL 0x130 178 #define CDNS_PORTCTRL_TEST_FAILED BIT(1) 179 #define CDNS_PORTCTRL_DIRN BIT(7) 180 #define CDNS_PORTCTRL_BANK_INVERT BIT(8) 181 182 #define CDNS_PORT_OFFSET 0x80 183 184 #define CDNS_PDI_CONFIG(n) (0x1100 + (n) * 16) 185 186 #define CDNS_PDI_CONFIG_SOFT_RESET BIT(24) 187 #define CDNS_PDI_CONFIG_CHANNEL GENMASK(15, 8) 188 #define CDNS_PDI_CONFIG_PORT GENMASK(4, 0) 189 190 /* Driver defaults */ 191 #define CDNS_TX_TIMEOUT 500 192 193 #define CDNS_SCP_RX_FIFOLEVEL 0x2 194 195 /* 196 * register accessor helpers 197 */ 198 static inline u32 cdns_readl(struct sdw_cdns *cdns, int offset) 199 { 200 return readl(cdns->registers + offset); 201 } 202 203 static inline void cdns_writel(struct sdw_cdns *cdns, int offset, u32 value) 204 { 205 writel(value, cdns->registers + offset); 206 } 207 208 static inline void cdns_updatel(struct sdw_cdns *cdns, 209 int offset, u32 mask, u32 val) 210 { 211 u32 tmp; 212 213 tmp = cdns_readl(cdns, offset); 214 tmp = (tmp & ~mask) | val; 215 cdns_writel(cdns, offset, tmp); 216 } 217 218 static int cdns_set_wait(struct sdw_cdns *cdns, int offset, u32 mask, u32 value) 219 { 220 int timeout = 10; 221 u32 reg_read; 222 223 /* Wait for bit to be set */ 224 do { 225 reg_read = readl(cdns->registers + offset); 226 if ((reg_read & mask) == value) 227 return 0; 228 229 timeout--; 230 usleep_range(50, 100); 231 } while (timeout != 0); 232 233 return -ETIMEDOUT; 234 } 235 236 static int cdns_clear_bit(struct sdw_cdns *cdns, int offset, u32 value) 237 { 238 writel(value, cdns->registers + offset); 239 240 /* Wait for bit to be self cleared */ 241 return cdns_set_wait(cdns, offset, value, 0); 242 } 243 244 /* 245 * all changes to the MCP_CONFIG, MCP_CONTROL, MCP_CMDCTRL and MCP_PHYCTRL 246 * need to be confirmed with a write to MCP_CONFIG_UPDATE 247 */ 248 static int cdns_config_update(struct sdw_cdns *cdns) 249 { 250 int ret; 251 252 if (sdw_cdns_is_clock_stop(cdns)) { 253 dev_err(cdns->dev, "Cannot program MCP_CONFIG_UPDATE in ClockStopMode\n"); 254 return -EINVAL; 255 } 256 257 ret = cdns_clear_bit(cdns, CDNS_MCP_CONFIG_UPDATE, 258 CDNS_MCP_CONFIG_UPDATE_BIT); 259 if (ret < 0) 260 dev_err(cdns->dev, "Config update timedout\n"); 261 262 return ret; 263 } 264 265 /* 266 * debugfs 267 */ 268 #ifdef CONFIG_DEBUG_FS 269 270 #define RD_BUF (2 * PAGE_SIZE) 271 272 static ssize_t cdns_sprintf(struct sdw_cdns *cdns, 273 char *buf, size_t pos, unsigned int reg) 274 { 275 return scnprintf(buf + pos, RD_BUF - pos, 276 "%4x\t%8x\n", reg, cdns_readl(cdns, reg)); 277 } 278 279 static int cdns_reg_show(struct seq_file *s, void *data) 280 { 281 struct sdw_cdns *cdns = s->private; 282 char *buf; 283 ssize_t ret; 284 int num_ports; 285 int i, j; 286 287 buf = kzalloc(RD_BUF, GFP_KERNEL); 288 if (!buf) 289 return -ENOMEM; 290 291 ret = scnprintf(buf, RD_BUF, "Register Value\n"); 292 ret += scnprintf(buf + ret, RD_BUF - ret, "\nMCP Registers\n"); 293 /* 8 MCP registers */ 294 for (i = CDNS_MCP_CONFIG; i <= CDNS_MCP_PHYCTRL; i += sizeof(u32)) 295 ret += cdns_sprintf(cdns, buf, ret, i); 296 297 ret += scnprintf(buf + ret, RD_BUF - ret, 298 "\nStatus & Intr Registers\n"); 299 /* 13 Status & Intr registers (offsets 0x70 and 0x74 not defined) */ 300 for (i = CDNS_MCP_STAT; i <= CDNS_MCP_FIFOSTAT; i += sizeof(u32)) 301 ret += cdns_sprintf(cdns, buf, ret, i); 302 303 ret += scnprintf(buf + ret, RD_BUF - ret, 304 "\nSSP & Clk ctrl Registers\n"); 305 ret += cdns_sprintf(cdns, buf, ret, CDNS_MCP_SSP_CTRL0); 306 ret += cdns_sprintf(cdns, buf, ret, CDNS_MCP_SSP_CTRL1); 307 ret += cdns_sprintf(cdns, buf, ret, CDNS_MCP_CLK_CTRL0); 308 ret += cdns_sprintf(cdns, buf, ret, CDNS_MCP_CLK_CTRL1); 309 310 ret += scnprintf(buf + ret, RD_BUF - ret, 311 "\nDPn B0 Registers\n"); 312 313 num_ports = cdns->num_ports; 314 315 for (i = 0; i < num_ports; i++) { 316 ret += scnprintf(buf + ret, RD_BUF - ret, 317 "\nDP-%d\n", i); 318 for (j = CDNS_DPN_B0_CONFIG(i); 319 j < CDNS_DPN_B0_ASYNC_CTRL(i); j += sizeof(u32)) 320 ret += cdns_sprintf(cdns, buf, ret, j); 321 } 322 323 ret += scnprintf(buf + ret, RD_BUF - ret, 324 "\nDPn B1 Registers\n"); 325 for (i = 0; i < num_ports; i++) { 326 ret += scnprintf(buf + ret, RD_BUF - ret, 327 "\nDP-%d\n", i); 328 329 for (j = CDNS_DPN_B1_CONFIG(i); 330 j < CDNS_DPN_B1_ASYNC_CTRL(i); j += sizeof(u32)) 331 ret += cdns_sprintf(cdns, buf, ret, j); 332 } 333 334 ret += scnprintf(buf + ret, RD_BUF - ret, 335 "\nDPn Control Registers\n"); 336 for (i = 0; i < num_ports; i++) 337 ret += cdns_sprintf(cdns, buf, ret, 338 CDNS_PORTCTRL + i * CDNS_PORT_OFFSET); 339 340 ret += scnprintf(buf + ret, RD_BUF - ret, 341 "\nPDIn Config Registers\n"); 342 343 /* number of PDI and ports is interchangeable */ 344 for (i = 0; i < num_ports; i++) 345 ret += cdns_sprintf(cdns, buf, ret, CDNS_PDI_CONFIG(i)); 346 347 seq_printf(s, "%s", buf); 348 kfree(buf); 349 350 return 0; 351 } 352 DEFINE_SHOW_ATTRIBUTE(cdns_reg); 353 354 static int cdns_hw_reset(void *data, u64 value) 355 { 356 struct sdw_cdns *cdns = data; 357 int ret; 358 359 if (value != 1) 360 return -EINVAL; 361 362 /* Userspace changed the hardware state behind the kernel's back */ 363 add_taint(TAINT_USER, LOCKDEP_STILL_OK); 364 365 ret = sdw_cdns_exit_reset(cdns); 366 367 dev_dbg(cdns->dev, "link hw_reset done: %d\n", ret); 368 369 return ret; 370 } 371 372 DEFINE_DEBUGFS_ATTRIBUTE(cdns_hw_reset_fops, NULL, cdns_hw_reset, "%llu\n"); 373 374 static int cdns_parity_error_injection(void *data, u64 value) 375 { 376 struct sdw_cdns *cdns = data; 377 struct sdw_bus *bus; 378 int ret; 379 380 if (value != 1) 381 return -EINVAL; 382 383 bus = &cdns->bus; 384 385 /* 386 * Resume Master device. If this results in a bus reset, the 387 * Slave devices will re-attach and be re-enumerated. 388 */ 389 ret = pm_runtime_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_vdbg(cdns->dev, "Msg Ack not received, cmd %d\n", i); 487 } 488 if (cdns->response_buf[i] & CDNS_MCP_RESP_NACK) { 489 nack = 1; 490 dev_err_ratelimited(cdns->dev, "Msg NACK received, cmd %d\n", i); 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 u64 slave_intstat) 738 { 739 enum sdw_slave_status status[SDW_MAX_DEVICES + 1]; 740 bool is_slave = false; 741 u32 mask; 742 int i, set_status; 743 744 memset(status, 0, sizeof(status)); 745 746 for (i = 0; i <= SDW_MAX_DEVICES; i++) { 747 mask = (slave_intstat >> (i * CDNS_MCP_SLAVE_STATUS_NUM)) & 748 CDNS_MCP_SLAVE_STATUS_BITS; 749 if (!mask) 750 continue; 751 752 is_slave = true; 753 set_status = 0; 754 755 if (mask & CDNS_MCP_SLAVE_INTSTAT_RESERVED) { 756 status[i] = SDW_SLAVE_RESERVED; 757 set_status++; 758 } 759 760 if (mask & CDNS_MCP_SLAVE_INTSTAT_ATTACHED) { 761 status[i] = SDW_SLAVE_ATTACHED; 762 set_status++; 763 } 764 765 if (mask & CDNS_MCP_SLAVE_INTSTAT_ALERT) { 766 status[i] = SDW_SLAVE_ALERT; 767 set_status++; 768 } 769 770 if (mask & CDNS_MCP_SLAVE_INTSTAT_NPRESENT) { 771 status[i] = SDW_SLAVE_UNATTACHED; 772 set_status++; 773 } 774 775 /* first check if Slave reported multiple status */ 776 if (set_status > 1) { 777 u32 val; 778 779 dev_warn_ratelimited(cdns->dev, 780 "Slave %d reported multiple Status: %d\n", 781 i, mask); 782 783 /* check latest status extracted from PING commands */ 784 val = cdns_readl(cdns, CDNS_MCP_SLAVE_STAT); 785 val >>= (i * 2); 786 787 switch (val & 0x3) { 788 case 0: 789 status[i] = SDW_SLAVE_UNATTACHED; 790 break; 791 case 1: 792 status[i] = SDW_SLAVE_ATTACHED; 793 break; 794 case 2: 795 status[i] = SDW_SLAVE_ALERT; 796 break; 797 case 3: 798 default: 799 status[i] = SDW_SLAVE_RESERVED; 800 break; 801 } 802 803 dev_warn_ratelimited(cdns->dev, 804 "Slave %d status updated to %d\n", 805 i, status[i]); 806 807 } 808 } 809 810 if (is_slave) 811 return sdw_handle_slave_status(&cdns->bus, status); 812 813 return 0; 814 } 815 816 /** 817 * sdw_cdns_irq() - Cadence interrupt handler 818 * @irq: irq number 819 * @dev_id: irq context 820 */ 821 irqreturn_t sdw_cdns_irq(int irq, void *dev_id) 822 { 823 struct sdw_cdns *cdns = dev_id; 824 u32 int_status; 825 int ret = IRQ_HANDLED; 826 827 /* Check if the link is up */ 828 if (!cdns->link_up) 829 return IRQ_NONE; 830 831 int_status = cdns_readl(cdns, CDNS_MCP_INTSTAT); 832 833 /* check for reserved values read as zero */ 834 if (int_status & CDNS_MCP_INT_RESERVED) 835 return IRQ_NONE; 836 837 if (!(int_status & CDNS_MCP_INT_IRQ)) 838 return IRQ_NONE; 839 840 if (int_status & CDNS_MCP_INT_RX_WL) { 841 cdns_read_response(cdns); 842 843 if (cdns->defer) { 844 cdns_fill_msg_resp(cdns, cdns->defer->msg, 845 cdns->defer->length, 0); 846 complete(&cdns->defer->complete); 847 cdns->defer = NULL; 848 } else { 849 complete(&cdns->tx_complete); 850 } 851 } 852 853 if (int_status & CDNS_MCP_INT_PARITY) { 854 /* Parity error detected by Master */ 855 dev_err_ratelimited(cdns->dev, "Parity error\n"); 856 } 857 858 if (int_status & CDNS_MCP_INT_CTRL_CLASH) { 859 /* Slave is driving bit slot during control word */ 860 dev_err_ratelimited(cdns->dev, "Bus clash for control word\n"); 861 } 862 863 if (int_status & CDNS_MCP_INT_DATA_CLASH) { 864 /* 865 * Multiple slaves trying to drive bit slot, or issue with 866 * ownership of data bits or Slave gone bonkers 867 */ 868 dev_err_ratelimited(cdns->dev, "Bus clash for data word\n"); 869 } 870 871 if (cdns->bus.params.m_data_mode != SDW_PORT_DATA_MODE_NORMAL && 872 int_status & CDNS_MCP_INT_DPINT) { 873 u32 port_intstat; 874 875 /* just log which ports report an error */ 876 port_intstat = cdns_readl(cdns, CDNS_MCP_PORT_INTSTAT); 877 dev_err_ratelimited(cdns->dev, "DP interrupt: PortIntStat %8x\n", 878 port_intstat); 879 880 /* clear status w/ write1 */ 881 cdns_writel(cdns, CDNS_MCP_PORT_INTSTAT, port_intstat); 882 } 883 884 if (int_status & CDNS_MCP_INT_SLAVE_MASK) { 885 /* Mask the Slave interrupt and wake thread */ 886 cdns_updatel(cdns, CDNS_MCP_INTMASK, 887 CDNS_MCP_INT_SLAVE_MASK, 0); 888 889 int_status &= ~CDNS_MCP_INT_SLAVE_MASK; 890 891 /* 892 * Deal with possible race condition between interrupt 893 * handling and disabling interrupts on suspend. 894 * 895 * If the master is in the process of disabling 896 * interrupts, don't schedule a workqueue 897 */ 898 if (cdns->interrupt_enabled) 899 schedule_work(&cdns->work); 900 } 901 902 cdns_writel(cdns, CDNS_MCP_INTSTAT, int_status); 903 return ret; 904 } 905 EXPORT_SYMBOL(sdw_cdns_irq); 906 907 /** 908 * cdns_update_slave_status_work - update slave status in a work since we will need to handle 909 * other interrupts eg. CDNS_MCP_INT_RX_WL during the update slave 910 * process. 911 * @work: cdns worker thread 912 */ 913 static void cdns_update_slave_status_work(struct work_struct *work) 914 { 915 struct sdw_cdns *cdns = 916 container_of(work, struct sdw_cdns, work); 917 u32 slave0, slave1; 918 u64 slave_intstat; 919 920 slave0 = cdns_readl(cdns, CDNS_MCP_SLAVE_INTSTAT0); 921 slave1 = cdns_readl(cdns, CDNS_MCP_SLAVE_INTSTAT1); 922 923 /* combine the two status */ 924 slave_intstat = ((u64)slave1 << 32) | slave0; 925 926 dev_dbg_ratelimited(cdns->dev, "Slave status change: 0x%llx\n", slave_intstat); 927 928 cdns_update_slave_status(cdns, slave_intstat); 929 cdns_writel(cdns, CDNS_MCP_SLAVE_INTSTAT0, slave0); 930 cdns_writel(cdns, CDNS_MCP_SLAVE_INTSTAT1, slave1); 931 932 /* clear and unmask Slave interrupt now */ 933 cdns_writel(cdns, CDNS_MCP_INTSTAT, CDNS_MCP_INT_SLAVE_MASK); 934 cdns_updatel(cdns, CDNS_MCP_INTMASK, 935 CDNS_MCP_INT_SLAVE_MASK, CDNS_MCP_INT_SLAVE_MASK); 936 937 } 938 939 /* 940 * init routines 941 */ 942 943 /** 944 * sdw_cdns_exit_reset() - Program reset parameters and start bus operations 945 * @cdns: Cadence instance 946 */ 947 int sdw_cdns_exit_reset(struct sdw_cdns *cdns) 948 { 949 /* program maximum length reset to be safe */ 950 cdns_updatel(cdns, CDNS_MCP_CONTROL, 951 CDNS_MCP_CONTROL_RST_DELAY, 952 CDNS_MCP_CONTROL_RST_DELAY); 953 954 /* use hardware generated reset */ 955 cdns_updatel(cdns, CDNS_MCP_CONTROL, 956 CDNS_MCP_CONTROL_HW_RST, 957 CDNS_MCP_CONTROL_HW_RST); 958 959 /* commit changes */ 960 cdns_updatel(cdns, CDNS_MCP_CONFIG_UPDATE, 961 CDNS_MCP_CONFIG_UPDATE_BIT, 962 CDNS_MCP_CONFIG_UPDATE_BIT); 963 964 /* don't wait here */ 965 return 0; 966 967 } 968 EXPORT_SYMBOL(sdw_cdns_exit_reset); 969 970 /** 971 * cdns_enable_slave_interrupts() - Enable SDW slave interrupts 972 * @cdns: Cadence instance 973 * @state: boolean for true/false 974 */ 975 static void cdns_enable_slave_interrupts(struct sdw_cdns *cdns, bool state) 976 { 977 u32 mask; 978 979 mask = cdns_readl(cdns, CDNS_MCP_INTMASK); 980 if (state) 981 mask |= CDNS_MCP_INT_SLAVE_MASK; 982 else 983 mask &= ~CDNS_MCP_INT_SLAVE_MASK; 984 985 cdns_writel(cdns, CDNS_MCP_INTMASK, mask); 986 } 987 988 /** 989 * sdw_cdns_enable_interrupt() - Enable SDW interrupts 990 * @cdns: Cadence instance 991 * @state: True if we are trying to enable interrupt. 992 */ 993 int sdw_cdns_enable_interrupt(struct sdw_cdns *cdns, bool state) 994 { 995 u32 slave_intmask0 = 0; 996 u32 slave_intmask1 = 0; 997 u32 mask = 0; 998 999 if (!state) 1000 goto update_masks; 1001 1002 slave_intmask0 = CDNS_MCP_SLAVE_INTMASK0_MASK; 1003 slave_intmask1 = CDNS_MCP_SLAVE_INTMASK1_MASK; 1004 1005 /* enable detection of all slave state changes */ 1006 mask = CDNS_MCP_INT_SLAVE_MASK; 1007 1008 /* enable detection of bus issues */ 1009 mask |= CDNS_MCP_INT_CTRL_CLASH | CDNS_MCP_INT_DATA_CLASH | 1010 CDNS_MCP_INT_PARITY; 1011 1012 /* port interrupt limited to test modes for now */ 1013 if (cdns->bus.params.m_data_mode != SDW_PORT_DATA_MODE_NORMAL) 1014 mask |= CDNS_MCP_INT_DPINT; 1015 1016 /* enable detection of RX fifo level */ 1017 mask |= CDNS_MCP_INT_RX_WL; 1018 1019 /* 1020 * CDNS_MCP_INT_IRQ needs to be set otherwise all previous 1021 * settings are irrelevant 1022 */ 1023 mask |= CDNS_MCP_INT_IRQ; 1024 1025 if (interrupt_mask) /* parameter override */ 1026 mask = interrupt_mask; 1027 1028 update_masks: 1029 /* clear slave interrupt status before enabling interrupt */ 1030 if (state) { 1031 u32 slave_state; 1032 1033 slave_state = cdns_readl(cdns, CDNS_MCP_SLAVE_INTSTAT0); 1034 cdns_writel(cdns, CDNS_MCP_SLAVE_INTSTAT0, slave_state); 1035 slave_state = cdns_readl(cdns, CDNS_MCP_SLAVE_INTSTAT1); 1036 cdns_writel(cdns, CDNS_MCP_SLAVE_INTSTAT1, slave_state); 1037 } 1038 cdns->interrupt_enabled = state; 1039 1040 /* 1041 * Complete any on-going status updates before updating masks, 1042 * and cancel queued status updates. 1043 * 1044 * There could be a race with a new interrupt thrown before 1045 * the 3 mask updates below are complete, so in the interrupt 1046 * we use the 'interrupt_enabled' status to prevent new work 1047 * from being queued. 1048 */ 1049 if (!state) 1050 cancel_work_sync(&cdns->work); 1051 1052 cdns_writel(cdns, CDNS_MCP_SLAVE_INTMASK0, slave_intmask0); 1053 cdns_writel(cdns, CDNS_MCP_SLAVE_INTMASK1, slave_intmask1); 1054 cdns_writel(cdns, CDNS_MCP_INTMASK, mask); 1055 1056 return 0; 1057 } 1058 EXPORT_SYMBOL(sdw_cdns_enable_interrupt); 1059 1060 static int cdns_allocate_pdi(struct sdw_cdns *cdns, 1061 struct sdw_cdns_pdi **stream, 1062 u32 num, u32 pdi_offset) 1063 { 1064 struct sdw_cdns_pdi *pdi; 1065 int i; 1066 1067 if (!num) 1068 return 0; 1069 1070 pdi = devm_kcalloc(cdns->dev, num, sizeof(*pdi), GFP_KERNEL); 1071 if (!pdi) 1072 return -ENOMEM; 1073 1074 for (i = 0; i < num; i++) { 1075 pdi[i].num = i + pdi_offset; 1076 } 1077 1078 *stream = pdi; 1079 return 0; 1080 } 1081 1082 /** 1083 * sdw_cdns_pdi_init() - PDI initialization routine 1084 * 1085 * @cdns: Cadence instance 1086 * @config: Stream configurations 1087 */ 1088 int sdw_cdns_pdi_init(struct sdw_cdns *cdns, 1089 struct sdw_cdns_stream_config config) 1090 { 1091 struct sdw_cdns_streams *stream; 1092 int offset; 1093 int ret; 1094 1095 cdns->pcm.num_bd = config.pcm_bd; 1096 cdns->pcm.num_in = config.pcm_in; 1097 cdns->pcm.num_out = config.pcm_out; 1098 cdns->pdm.num_bd = config.pdm_bd; 1099 cdns->pdm.num_in = config.pdm_in; 1100 cdns->pdm.num_out = config.pdm_out; 1101 1102 /* Allocate PDIs for PCMs */ 1103 stream = &cdns->pcm; 1104 1105 /* we allocate PDI0 and PDI1 which are used for Bulk */ 1106 offset = 0; 1107 1108 ret = cdns_allocate_pdi(cdns, &stream->bd, 1109 stream->num_bd, offset); 1110 if (ret) 1111 return ret; 1112 1113 offset += stream->num_bd; 1114 1115 ret = cdns_allocate_pdi(cdns, &stream->in, 1116 stream->num_in, offset); 1117 if (ret) 1118 return ret; 1119 1120 offset += stream->num_in; 1121 1122 ret = cdns_allocate_pdi(cdns, &stream->out, 1123 stream->num_out, offset); 1124 if (ret) 1125 return ret; 1126 1127 /* Update total number of PCM PDIs */ 1128 stream->num_pdi = stream->num_bd + stream->num_in + stream->num_out; 1129 cdns->num_ports = stream->num_pdi; 1130 1131 /* Allocate PDIs for PDMs */ 1132 stream = &cdns->pdm; 1133 ret = cdns_allocate_pdi(cdns, &stream->bd, 1134 stream->num_bd, offset); 1135 if (ret) 1136 return ret; 1137 1138 offset += stream->num_bd; 1139 1140 ret = cdns_allocate_pdi(cdns, &stream->in, 1141 stream->num_in, offset); 1142 if (ret) 1143 return ret; 1144 1145 offset += stream->num_in; 1146 1147 ret = cdns_allocate_pdi(cdns, &stream->out, 1148 stream->num_out, offset); 1149 1150 if (ret) 1151 return ret; 1152 1153 /* Update total number of PDM PDIs */ 1154 stream->num_pdi = stream->num_bd + stream->num_in + stream->num_out; 1155 cdns->num_ports += stream->num_pdi; 1156 1157 return 0; 1158 } 1159 EXPORT_SYMBOL(sdw_cdns_pdi_init); 1160 1161 static u32 cdns_set_initial_frame_shape(int n_rows, int n_cols) 1162 { 1163 u32 val; 1164 int c; 1165 int r; 1166 1167 r = sdw_find_row_index(n_rows); 1168 c = sdw_find_col_index(n_cols); 1169 1170 val = FIELD_PREP(CDNS_MCP_FRAME_SHAPE_ROW_MASK, r); 1171 val |= FIELD_PREP(CDNS_MCP_FRAME_SHAPE_COL_MASK, c); 1172 1173 return val; 1174 } 1175 1176 static void cdns_init_clock_ctrl(struct sdw_cdns *cdns) 1177 { 1178 struct sdw_bus *bus = &cdns->bus; 1179 struct sdw_master_prop *prop = &bus->prop; 1180 u32 val; 1181 u32 ssp_interval; 1182 int divider; 1183 1184 /* Set clock divider */ 1185 divider = (prop->mclk_freq / prop->max_clk_freq) - 1; 1186 1187 cdns_updatel(cdns, CDNS_MCP_CLK_CTRL0, 1188 CDNS_MCP_CLK_MCLKD_MASK, divider); 1189 cdns_updatel(cdns, CDNS_MCP_CLK_CTRL1, 1190 CDNS_MCP_CLK_MCLKD_MASK, divider); 1191 1192 /* 1193 * Frame shape changes after initialization have to be done 1194 * with the bank switch mechanism 1195 */ 1196 val = cdns_set_initial_frame_shape(prop->default_row, 1197 prop->default_col); 1198 cdns_writel(cdns, CDNS_MCP_FRAME_SHAPE_INIT, val); 1199 1200 /* Set SSP interval to default value */ 1201 ssp_interval = prop->default_frame_rate / SDW_CADENCE_GSYNC_HZ; 1202 cdns_writel(cdns, CDNS_MCP_SSP_CTRL0, ssp_interval); 1203 cdns_writel(cdns, CDNS_MCP_SSP_CTRL1, ssp_interval); 1204 } 1205 1206 /** 1207 * sdw_cdns_init() - Cadence initialization 1208 * @cdns: Cadence instance 1209 */ 1210 int sdw_cdns_init(struct sdw_cdns *cdns) 1211 { 1212 u32 val; 1213 1214 cdns_init_clock_ctrl(cdns); 1215 1216 /* reset msg_count to default value of FIFOLEVEL */ 1217 cdns->msg_count = cdns_readl(cdns, CDNS_MCP_FIFOLEVEL); 1218 1219 /* flush command FIFOs */ 1220 cdns_updatel(cdns, CDNS_MCP_CONTROL, CDNS_MCP_CONTROL_CMD_RST, 1221 CDNS_MCP_CONTROL_CMD_RST); 1222 1223 /* Set cmd accept mode */ 1224 cdns_updatel(cdns, CDNS_MCP_CONTROL, CDNS_MCP_CONTROL_CMD_ACCEPT, 1225 CDNS_MCP_CONTROL_CMD_ACCEPT); 1226 1227 /* Configure mcp config */ 1228 val = cdns_readl(cdns, CDNS_MCP_CONFIG); 1229 1230 /* enable bus operations with clock and data */ 1231 val &= ~CDNS_MCP_CONFIG_OP; 1232 val |= CDNS_MCP_CONFIG_OP_NORMAL; 1233 1234 /* Set cmd mode for Tx and Rx cmds */ 1235 val &= ~CDNS_MCP_CONFIG_CMD; 1236 1237 /* Disable sniffer mode */ 1238 val &= ~CDNS_MCP_CONFIG_SNIFFER; 1239 1240 /* Disable auto bus release */ 1241 val &= ~CDNS_MCP_CONFIG_BUS_REL; 1242 1243 if (cdns->bus.multi_link) 1244 /* Set Multi-master mode to take gsync into account */ 1245 val |= CDNS_MCP_CONFIG_MMASTER; 1246 1247 /* leave frame delay to hardware default of 0x1F */ 1248 1249 /* leave command retry to hardware default of 0 */ 1250 1251 cdns_writel(cdns, CDNS_MCP_CONFIG, val); 1252 1253 /* changes will be committed later */ 1254 return 0; 1255 } 1256 EXPORT_SYMBOL(sdw_cdns_init); 1257 1258 int cdns_bus_conf(struct sdw_bus *bus, struct sdw_bus_params *params) 1259 { 1260 struct sdw_master_prop *prop = &bus->prop; 1261 struct sdw_cdns *cdns = bus_to_cdns(bus); 1262 int mcp_clkctrl_off; 1263 int divider; 1264 1265 if (!params->curr_dr_freq) { 1266 dev_err(cdns->dev, "NULL curr_dr_freq\n"); 1267 return -EINVAL; 1268 } 1269 1270 divider = prop->mclk_freq * SDW_DOUBLE_RATE_FACTOR / 1271 params->curr_dr_freq; 1272 divider--; /* divider is 1/(N+1) */ 1273 1274 if (params->next_bank) 1275 mcp_clkctrl_off = CDNS_MCP_CLK_CTRL1; 1276 else 1277 mcp_clkctrl_off = CDNS_MCP_CLK_CTRL0; 1278 1279 cdns_updatel(cdns, mcp_clkctrl_off, CDNS_MCP_CLK_MCLKD_MASK, divider); 1280 1281 return 0; 1282 } 1283 EXPORT_SYMBOL(cdns_bus_conf); 1284 1285 static int cdns_port_params(struct sdw_bus *bus, 1286 struct sdw_port_params *p_params, unsigned int bank) 1287 { 1288 struct sdw_cdns *cdns = bus_to_cdns(bus); 1289 int dpn_config = 0, dpn_config_off; 1290 1291 if (bank) 1292 dpn_config_off = CDNS_DPN_B1_CONFIG(p_params->num); 1293 else 1294 dpn_config_off = CDNS_DPN_B0_CONFIG(p_params->num); 1295 1296 dpn_config = cdns_readl(cdns, dpn_config_off); 1297 1298 u32p_replace_bits(&dpn_config, (p_params->bps - 1), CDNS_DPN_CONFIG_WL); 1299 u32p_replace_bits(&dpn_config, p_params->flow_mode, CDNS_DPN_CONFIG_PORT_FLOW); 1300 u32p_replace_bits(&dpn_config, p_params->data_mode, CDNS_DPN_CONFIG_PORT_DAT); 1301 1302 cdns_writel(cdns, dpn_config_off, dpn_config); 1303 1304 return 0; 1305 } 1306 1307 static int cdns_transport_params(struct sdw_bus *bus, 1308 struct sdw_transport_params *t_params, 1309 enum sdw_reg_bank bank) 1310 { 1311 struct sdw_cdns *cdns = bus_to_cdns(bus); 1312 int dpn_offsetctrl = 0, dpn_offsetctrl_off; 1313 int dpn_config = 0, dpn_config_off; 1314 int dpn_hctrl = 0, dpn_hctrl_off; 1315 int num = t_params->port_num; 1316 int dpn_samplectrl_off; 1317 1318 /* 1319 * Note: Only full data port is supported on the Master side for 1320 * both PCM and PDM ports. 1321 */ 1322 1323 if (bank) { 1324 dpn_config_off = CDNS_DPN_B1_CONFIG(num); 1325 dpn_samplectrl_off = CDNS_DPN_B1_SAMPLE_CTRL(num); 1326 dpn_hctrl_off = CDNS_DPN_B1_HCTRL(num); 1327 dpn_offsetctrl_off = CDNS_DPN_B1_OFFSET_CTRL(num); 1328 } else { 1329 dpn_config_off = CDNS_DPN_B0_CONFIG(num); 1330 dpn_samplectrl_off = CDNS_DPN_B0_SAMPLE_CTRL(num); 1331 dpn_hctrl_off = CDNS_DPN_B0_HCTRL(num); 1332 dpn_offsetctrl_off = CDNS_DPN_B0_OFFSET_CTRL(num); 1333 } 1334 1335 dpn_config = cdns_readl(cdns, dpn_config_off); 1336 u32p_replace_bits(&dpn_config, t_params->blk_grp_ctrl, CDNS_DPN_CONFIG_BGC); 1337 u32p_replace_bits(&dpn_config, t_params->blk_pkg_mode, CDNS_DPN_CONFIG_BPM); 1338 cdns_writel(cdns, dpn_config_off, dpn_config); 1339 1340 u32p_replace_bits(&dpn_offsetctrl, t_params->offset1, CDNS_DPN_OFFSET_CTRL_1); 1341 u32p_replace_bits(&dpn_offsetctrl, t_params->offset2, CDNS_DPN_OFFSET_CTRL_2); 1342 cdns_writel(cdns, dpn_offsetctrl_off, dpn_offsetctrl); 1343 1344 u32p_replace_bits(&dpn_hctrl, t_params->hstart, CDNS_DPN_HCTRL_HSTART); 1345 u32p_replace_bits(&dpn_hctrl, t_params->hstop, CDNS_DPN_HCTRL_HSTOP); 1346 u32p_replace_bits(&dpn_hctrl, t_params->lane_ctrl, CDNS_DPN_HCTRL_LCTRL); 1347 1348 cdns_writel(cdns, dpn_hctrl_off, dpn_hctrl); 1349 cdns_writel(cdns, dpn_samplectrl_off, (t_params->sample_interval - 1)); 1350 1351 return 0; 1352 } 1353 1354 static int cdns_port_enable(struct sdw_bus *bus, 1355 struct sdw_enable_ch *enable_ch, unsigned int bank) 1356 { 1357 struct sdw_cdns *cdns = bus_to_cdns(bus); 1358 int dpn_chnen_off, ch_mask; 1359 1360 if (bank) 1361 dpn_chnen_off = CDNS_DPN_B1_CH_EN(enable_ch->port_num); 1362 else 1363 dpn_chnen_off = CDNS_DPN_B0_CH_EN(enable_ch->port_num); 1364 1365 ch_mask = enable_ch->ch_mask * enable_ch->enable; 1366 cdns_writel(cdns, dpn_chnen_off, ch_mask); 1367 1368 return 0; 1369 } 1370 1371 static const struct sdw_master_port_ops cdns_port_ops = { 1372 .dpn_set_port_params = cdns_port_params, 1373 .dpn_set_port_transport_params = cdns_transport_params, 1374 .dpn_port_enable_ch = cdns_port_enable, 1375 }; 1376 1377 /** 1378 * sdw_cdns_is_clock_stop: Check clock status 1379 * 1380 * @cdns: Cadence instance 1381 */ 1382 bool sdw_cdns_is_clock_stop(struct sdw_cdns *cdns) 1383 { 1384 return !!(cdns_readl(cdns, CDNS_MCP_STAT) & CDNS_MCP_STAT_CLK_STOP); 1385 } 1386 EXPORT_SYMBOL(sdw_cdns_is_clock_stop); 1387 1388 /** 1389 * sdw_cdns_clock_stop: Cadence clock stop configuration routine 1390 * 1391 * @cdns: Cadence instance 1392 * @block_wake: prevent wakes if required by the platform 1393 */ 1394 int sdw_cdns_clock_stop(struct sdw_cdns *cdns, bool block_wake) 1395 { 1396 bool slave_present = false; 1397 struct sdw_slave *slave; 1398 int ret; 1399 1400 /* Check suspend status */ 1401 if (sdw_cdns_is_clock_stop(cdns)) { 1402 dev_dbg(cdns->dev, "Clock is already stopped\n"); 1403 return 0; 1404 } 1405 1406 /* 1407 * Before entering clock stop we mask the Slave 1408 * interrupts. This helps avoid having to deal with e.g. a 1409 * Slave becoming UNATTACHED while the clock is being stopped 1410 */ 1411 cdns_enable_slave_interrupts(cdns, false); 1412 1413 /* 1414 * For specific platforms, it is required to be able to put 1415 * master into a state in which it ignores wake-up trials 1416 * in clock stop state 1417 */ 1418 if (block_wake) 1419 cdns_updatel(cdns, CDNS_MCP_CONTROL, 1420 CDNS_MCP_CONTROL_BLOCK_WAKEUP, 1421 CDNS_MCP_CONTROL_BLOCK_WAKEUP); 1422 1423 list_for_each_entry(slave, &cdns->bus.slaves, node) { 1424 if (slave->status == SDW_SLAVE_ATTACHED || 1425 slave->status == SDW_SLAVE_ALERT) { 1426 slave_present = true; 1427 break; 1428 } 1429 } 1430 1431 /* 1432 * This CMD_ACCEPT should be used when there are no devices 1433 * attached on the link when entering clock stop mode. If this is 1434 * not set and there is a broadcast write then the command ignored 1435 * will be treated as a failure 1436 */ 1437 if (!slave_present) 1438 cdns_updatel(cdns, CDNS_MCP_CONTROL, 1439 CDNS_MCP_CONTROL_CMD_ACCEPT, 1440 CDNS_MCP_CONTROL_CMD_ACCEPT); 1441 else 1442 cdns_updatel(cdns, CDNS_MCP_CONTROL, 1443 CDNS_MCP_CONTROL_CMD_ACCEPT, 0); 1444 1445 /* commit changes */ 1446 ret = cdns_config_update(cdns); 1447 if (ret < 0) { 1448 dev_err(cdns->dev, "%s: config_update failed\n", __func__); 1449 return ret; 1450 } 1451 1452 /* Prepare slaves for clock stop */ 1453 if (slave_present) { 1454 ret = sdw_bus_prep_clk_stop(&cdns->bus); 1455 if (ret < 0 && ret != -ENODATA) { 1456 dev_err(cdns->dev, "prepare clock stop failed %d\n", ret); 1457 return ret; 1458 } 1459 } 1460 1461 /* 1462 * Enter clock stop mode and only report errors if there are 1463 * Slave devices present (ALERT or ATTACHED) 1464 */ 1465 ret = sdw_bus_clk_stop(&cdns->bus); 1466 if (ret < 0 && slave_present && ret != -ENODATA) { 1467 dev_err(cdns->dev, "bus clock stop failed %d\n", ret); 1468 return ret; 1469 } 1470 1471 ret = cdns_set_wait(cdns, CDNS_MCP_STAT, 1472 CDNS_MCP_STAT_CLK_STOP, 1473 CDNS_MCP_STAT_CLK_STOP); 1474 if (ret < 0) 1475 dev_err(cdns->dev, "Clock stop failed %d\n", ret); 1476 1477 return ret; 1478 } 1479 EXPORT_SYMBOL(sdw_cdns_clock_stop); 1480 1481 /** 1482 * sdw_cdns_clock_restart: Cadence PM clock restart configuration routine 1483 * 1484 * @cdns: Cadence instance 1485 * @bus_reset: context may be lost while in low power modes and the bus 1486 * may require a Severe Reset and re-enumeration after a wake. 1487 */ 1488 int sdw_cdns_clock_restart(struct sdw_cdns *cdns, bool bus_reset) 1489 { 1490 int ret; 1491 1492 /* unmask Slave interrupts that were masked when stopping the clock */ 1493 cdns_enable_slave_interrupts(cdns, true); 1494 1495 ret = cdns_clear_bit(cdns, CDNS_MCP_CONTROL, 1496 CDNS_MCP_CONTROL_CLK_STOP_CLR); 1497 if (ret < 0) { 1498 dev_err(cdns->dev, "Couldn't exit from clock stop\n"); 1499 return ret; 1500 } 1501 1502 ret = cdns_set_wait(cdns, CDNS_MCP_STAT, CDNS_MCP_STAT_CLK_STOP, 0); 1503 if (ret < 0) { 1504 dev_err(cdns->dev, "clock stop exit failed %d\n", ret); 1505 return ret; 1506 } 1507 1508 cdns_updatel(cdns, CDNS_MCP_CONTROL, 1509 CDNS_MCP_CONTROL_BLOCK_WAKEUP, 0); 1510 1511 /* 1512 * clear CMD_ACCEPT so that the command ignored 1513 * will be treated as a failure during a broadcast write 1514 */ 1515 cdns_updatel(cdns, CDNS_MCP_CONTROL, CDNS_MCP_CONTROL_CMD_ACCEPT, 0); 1516 1517 if (!bus_reset) { 1518 1519 /* enable bus operations with clock and data */ 1520 cdns_updatel(cdns, CDNS_MCP_CONFIG, 1521 CDNS_MCP_CONFIG_OP, 1522 CDNS_MCP_CONFIG_OP_NORMAL); 1523 1524 ret = cdns_config_update(cdns); 1525 if (ret < 0) { 1526 dev_err(cdns->dev, "%s: config_update failed\n", __func__); 1527 return ret; 1528 } 1529 1530 ret = sdw_bus_exit_clk_stop(&cdns->bus); 1531 if (ret < 0) 1532 dev_err(cdns->dev, "bus failed to exit clock stop %d\n", ret); 1533 } 1534 1535 return ret; 1536 } 1537 EXPORT_SYMBOL(sdw_cdns_clock_restart); 1538 1539 /** 1540 * sdw_cdns_probe() - Cadence probe routine 1541 * @cdns: Cadence instance 1542 */ 1543 int sdw_cdns_probe(struct sdw_cdns *cdns) 1544 { 1545 init_completion(&cdns->tx_complete); 1546 cdns->bus.port_ops = &cdns_port_ops; 1547 1548 INIT_WORK(&cdns->work, cdns_update_slave_status_work); 1549 return 0; 1550 } 1551 EXPORT_SYMBOL(sdw_cdns_probe); 1552 1553 int cdns_set_sdw_stream(struct snd_soc_dai *dai, 1554 void *stream, bool pcm, int direction) 1555 { 1556 struct sdw_cdns *cdns = snd_soc_dai_get_drvdata(dai); 1557 struct sdw_cdns_dma_data *dma; 1558 1559 if (stream) { 1560 /* first paranoia check */ 1561 if (direction == SNDRV_PCM_STREAM_PLAYBACK) 1562 dma = dai->playback_dma_data; 1563 else 1564 dma = dai->capture_dma_data; 1565 1566 if (dma) { 1567 dev_err(dai->dev, 1568 "dma_data already allocated for dai %s\n", 1569 dai->name); 1570 return -EINVAL; 1571 } 1572 1573 /* allocate and set dma info */ 1574 dma = kzalloc(sizeof(*dma), GFP_KERNEL); 1575 if (!dma) 1576 return -ENOMEM; 1577 1578 if (pcm) 1579 dma->stream_type = SDW_STREAM_PCM; 1580 else 1581 dma->stream_type = SDW_STREAM_PDM; 1582 1583 dma->bus = &cdns->bus; 1584 dma->link_id = cdns->instance; 1585 1586 dma->stream = stream; 1587 1588 if (direction == SNDRV_PCM_STREAM_PLAYBACK) 1589 dai->playback_dma_data = dma; 1590 else 1591 dai->capture_dma_data = dma; 1592 } else { 1593 /* for NULL stream we release allocated dma_data */ 1594 if (direction == SNDRV_PCM_STREAM_PLAYBACK) { 1595 kfree(dai->playback_dma_data); 1596 dai->playback_dma_data = NULL; 1597 } else { 1598 kfree(dai->capture_dma_data); 1599 dai->capture_dma_data = NULL; 1600 } 1601 } 1602 return 0; 1603 } 1604 EXPORT_SYMBOL(cdns_set_sdw_stream); 1605 1606 /** 1607 * cdns_find_pdi() - Find a free PDI 1608 * 1609 * @cdns: Cadence instance 1610 * @offset: Starting offset 1611 * @num: Number of PDIs 1612 * @pdi: PDI instances 1613 * @dai_id: DAI id 1614 * 1615 * Find a PDI for a given PDI array. The PDI num and dai_id are 1616 * expected to match, return NULL otherwise. 1617 */ 1618 static struct sdw_cdns_pdi *cdns_find_pdi(struct sdw_cdns *cdns, 1619 unsigned int offset, 1620 unsigned int num, 1621 struct sdw_cdns_pdi *pdi, 1622 int dai_id) 1623 { 1624 int i; 1625 1626 for (i = offset; i < offset + num; i++) 1627 if (pdi[i].num == dai_id) 1628 return &pdi[i]; 1629 1630 return NULL; 1631 } 1632 1633 /** 1634 * sdw_cdns_config_stream: Configure a stream 1635 * 1636 * @cdns: Cadence instance 1637 * @ch: Channel count 1638 * @dir: Data direction 1639 * @pdi: PDI to be used 1640 */ 1641 void sdw_cdns_config_stream(struct sdw_cdns *cdns, 1642 u32 ch, u32 dir, struct sdw_cdns_pdi *pdi) 1643 { 1644 u32 offset, val = 0; 1645 1646 if (dir == SDW_DATA_DIR_RX) { 1647 val = CDNS_PORTCTRL_DIRN; 1648 1649 if (cdns->bus.params.m_data_mode != SDW_PORT_DATA_MODE_NORMAL) 1650 val |= CDNS_PORTCTRL_TEST_FAILED; 1651 } 1652 offset = CDNS_PORTCTRL + pdi->num * CDNS_PORT_OFFSET; 1653 cdns_updatel(cdns, offset, 1654 CDNS_PORTCTRL_DIRN | CDNS_PORTCTRL_TEST_FAILED, 1655 val); 1656 1657 val = pdi->num; 1658 val |= CDNS_PDI_CONFIG_SOFT_RESET; 1659 val |= FIELD_PREP(CDNS_PDI_CONFIG_CHANNEL, (1 << ch) - 1); 1660 cdns_writel(cdns, CDNS_PDI_CONFIG(pdi->num), val); 1661 } 1662 EXPORT_SYMBOL(sdw_cdns_config_stream); 1663 1664 /** 1665 * sdw_cdns_alloc_pdi() - Allocate a PDI 1666 * 1667 * @cdns: Cadence instance 1668 * @stream: Stream to be allocated 1669 * @ch: Channel count 1670 * @dir: Data direction 1671 * @dai_id: DAI id 1672 */ 1673 struct sdw_cdns_pdi *sdw_cdns_alloc_pdi(struct sdw_cdns *cdns, 1674 struct sdw_cdns_streams *stream, 1675 u32 ch, u32 dir, int dai_id) 1676 { 1677 struct sdw_cdns_pdi *pdi = NULL; 1678 1679 if (dir == SDW_DATA_DIR_RX) 1680 pdi = cdns_find_pdi(cdns, 0, stream->num_in, stream->in, 1681 dai_id); 1682 else 1683 pdi = cdns_find_pdi(cdns, 0, stream->num_out, stream->out, 1684 dai_id); 1685 1686 /* check if we found a PDI, else find in bi-directional */ 1687 if (!pdi) 1688 pdi = cdns_find_pdi(cdns, 2, stream->num_bd, stream->bd, 1689 dai_id); 1690 1691 if (pdi) { 1692 pdi->l_ch_num = 0; 1693 pdi->h_ch_num = ch - 1; 1694 pdi->dir = dir; 1695 pdi->ch_count = ch; 1696 } 1697 1698 return pdi; 1699 } 1700 EXPORT_SYMBOL(sdw_cdns_alloc_pdi); 1701 1702 MODULE_LICENSE("Dual BSD/GPL"); 1703 MODULE_DESCRIPTION("Cadence Soundwire Library"); 1704