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1// SPDX-License-Identifier: (GPL-2.0 OR BSD-3-Clause)2// Copyright(c) 2015-17 Intel Corporation.3 4/*5 * Cadence SoundWire Master module6 * Used by Master driver7 */8 9#include <linux/cleanup.h>10#include <linux/delay.h>11#include <linux/device.h>12#include <linux/debugfs.h>13#include <linux/interrupt.h>14#include <linux/io.h>15#include <linux/module.h>16#include <linux/mod_devicetable.h>17#include <linux/pm_runtime.h>18#include <linux/soundwire/sdw_registers.h>19#include <linux/soundwire/sdw.h>20#include <sound/pcm_params.h>21#include <sound/soc.h>22#include <linux/workqueue.h>23#include "bus.h"24#include "cadence_master.h"25 26static int interrupt_mask;27module_param_named(cnds_mcp_int_mask, interrupt_mask, int, 0444);28MODULE_PARM_DESC(cdns_mcp_int_mask, "Cadence MCP IntMask");29 30#define CDNS_MCP_CONFIG 0x031#define CDNS_MCP_CONFIG_BUS_REL BIT(6)32 33#define CDNS_IP_MCP_CONFIG 0x0 /* IP offset added at run-time */34 35#define CDNS_IP_MCP_CONFIG_MCMD_RETRY GENMASK(27, 24)36#define CDNS_IP_MCP_CONFIG_MPREQ_DELAY GENMASK(20, 16)37#define CDNS_IP_MCP_CONFIG_MMASTER BIT(7)38#define CDNS_IP_MCP_CONFIG_SNIFFER BIT(5)39#define CDNS_IP_MCP_CONFIG_CMD BIT(3)40#define CDNS_IP_MCP_CONFIG_OP GENMASK(2, 0)41#define CDNS_IP_MCP_CONFIG_OP_NORMAL 042 43#define CDNS_MCP_CONTROL 0x444 45#define CDNS_MCP_CONTROL_CMD_RST BIT(7)46#define CDNS_MCP_CONTROL_SOFT_RST BIT(6)47#define CDNS_MCP_CONTROL_HW_RST BIT(4)48#define CDNS_MCP_CONTROL_CLK_STOP_CLR BIT(2)49 50#define CDNS_IP_MCP_CONTROL 0x4 /* IP offset added at run-time */51 52#define CDNS_IP_MCP_CONTROL_RST_DELAY GENMASK(10, 8)53#define CDNS_IP_MCP_CONTROL_SW_RST BIT(5)54#define CDNS_IP_MCP_CONTROL_CLK_PAUSE BIT(3)55#define CDNS_IP_MCP_CONTROL_CMD_ACCEPT BIT(1)56#define CDNS_IP_MCP_CONTROL_BLOCK_WAKEUP BIT(0)57 58#define CDNS_IP_MCP_CMDCTRL 0x8 /* IP offset added at run-time */59 60#define CDNS_IP_MCP_CMDCTRL_INSERT_PARITY_ERR BIT(2)61 62#define CDNS_MCP_SSPSTAT 0xC63#define CDNS_MCP_FRAME_SHAPE 0x1064#define CDNS_MCP_FRAME_SHAPE_INIT 0x1465#define CDNS_MCP_FRAME_SHAPE_COL_MASK GENMASK(2, 0)66#define CDNS_MCP_FRAME_SHAPE_ROW_MASK GENMASK(7, 3)67 68#define CDNS_MCP_CONFIG_UPDATE 0x1869#define CDNS_MCP_CONFIG_UPDATE_BIT BIT(0)70 71#define CDNS_MCP_PHYCTRL 0x1C72#define CDNS_MCP_SSP_CTRL0 0x2073#define CDNS_MCP_SSP_CTRL1 0x2874#define CDNS_MCP_CLK_CTRL0 0x3075#define CDNS_MCP_CLK_CTRL1 0x3876#define CDNS_MCP_CLK_MCLKD_MASK GENMASK(7, 0)77 78#define CDNS_MCP_STAT 0x4079 80#define CDNS_MCP_STAT_ACTIVE_BANK BIT(20)81#define CDNS_MCP_STAT_CLK_STOP BIT(16)82 83#define CDNS_MCP_INTSTAT 0x4484#define CDNS_MCP_INTMASK 0x4885 86#define CDNS_MCP_INT_IRQ BIT(31)87#define CDNS_MCP_INT_RESERVED1 GENMASK(30, 17)88#define CDNS_MCP_INT_WAKEUP BIT(16)89#define CDNS_MCP_INT_SLAVE_RSVD BIT(15)90#define CDNS_MCP_INT_SLAVE_ALERT BIT(14)91#define CDNS_MCP_INT_SLAVE_ATTACH BIT(13)92#define CDNS_MCP_INT_SLAVE_NATTACH BIT(12)93#define CDNS_MCP_INT_SLAVE_MASK GENMASK(15, 12)94#define CDNS_MCP_INT_DPINT BIT(11)95#define CDNS_MCP_INT_CTRL_CLASH BIT(10)96#define CDNS_MCP_INT_DATA_CLASH BIT(9)97#define CDNS_MCP_INT_PARITY BIT(8)98#define CDNS_MCP_INT_CMD_ERR BIT(7)99#define CDNS_MCP_INT_RESERVED2 GENMASK(6, 4)100#define CDNS_MCP_INT_RX_NE BIT(3)101#define CDNS_MCP_INT_RX_WL BIT(2)102#define CDNS_MCP_INT_TXE BIT(1)103#define CDNS_MCP_INT_TXF BIT(0)104#define CDNS_MCP_INT_RESERVED (CDNS_MCP_INT_RESERVED1 | CDNS_MCP_INT_RESERVED2)105 106#define CDNS_MCP_INTSET 0x4C107 108#define CDNS_MCP_SLAVE_STAT 0x50109#define CDNS_MCP_SLAVE_STAT_MASK GENMASK(1, 0)110 111#define CDNS_MCP_SLAVE_INTSTAT0 0x54112#define CDNS_MCP_SLAVE_INTSTAT1 0x58113#define CDNS_MCP_SLAVE_INTSTAT_NPRESENT BIT(0)114#define CDNS_MCP_SLAVE_INTSTAT_ATTACHED BIT(1)115#define CDNS_MCP_SLAVE_INTSTAT_ALERT BIT(2)116#define CDNS_MCP_SLAVE_INTSTAT_RESERVED BIT(3)117#define CDNS_MCP_SLAVE_STATUS_BITS GENMASK(3, 0)118#define CDNS_MCP_SLAVE_STATUS_NUM 4119 120#define CDNS_MCP_SLAVE_INTMASK0 0x5C121#define CDNS_MCP_SLAVE_INTMASK1 0x60122 123#define CDNS_MCP_SLAVE_INTMASK0_MASK GENMASK(31, 0)124#define CDNS_MCP_SLAVE_INTMASK1_MASK GENMASK(15, 0)125 126#define CDNS_MCP_PORT_INTSTAT 0x64127#define CDNS_MCP_PDI_STAT 0x6C128 129#define CDNS_MCP_FIFOLEVEL 0x78130#define CDNS_MCP_FIFOSTAT 0x7C131#define CDNS_MCP_RX_FIFO_AVAIL GENMASK(5, 0)132 133#define CDNS_IP_MCP_CMD_BASE 0x80 /* IP offset added at run-time */134#define CDNS_IP_MCP_RESP_BASE 0x80 /* IP offset added at run-time */135/* FIFO can hold 8 commands */136#define CDNS_MCP_CMD_LEN 8137#define CDNS_MCP_CMD_WORD_LEN 0x4138 139#define CDNS_MCP_CMD_SSP_TAG BIT(31)140#define CDNS_MCP_CMD_COMMAND GENMASK(30, 28)141#define CDNS_MCP_CMD_DEV_ADDR GENMASK(27, 24)142#define CDNS_MCP_CMD_REG_ADDR GENMASK(23, 8)143#define CDNS_MCP_CMD_REG_DATA GENMASK(7, 0)144 145#define CDNS_MCP_CMD_READ 2146#define CDNS_MCP_CMD_WRITE 3147 148#define CDNS_MCP_RESP_RDATA GENMASK(15, 8)149#define CDNS_MCP_RESP_ACK BIT(0)150#define CDNS_MCP_RESP_NACK BIT(1)151 152#define CDNS_DP_SIZE 128153 154#define CDNS_DPN_B0_CONFIG(n) (0x100 + CDNS_DP_SIZE * (n))155#define CDNS_DPN_B0_CH_EN(n) (0x104 + CDNS_DP_SIZE * (n))156#define CDNS_DPN_B0_SAMPLE_CTRL(n) (0x108 + CDNS_DP_SIZE * (n))157#define CDNS_DPN_B0_OFFSET_CTRL(n) (0x10C + CDNS_DP_SIZE * (n))158#define CDNS_DPN_B0_HCTRL(n) (0x110 + CDNS_DP_SIZE * (n))159#define CDNS_DPN_B0_ASYNC_CTRL(n) (0x114 + CDNS_DP_SIZE * (n))160 161#define CDNS_DPN_B1_CONFIG(n) (0x118 + CDNS_DP_SIZE * (n))162#define CDNS_DPN_B1_CH_EN(n) (0x11C + CDNS_DP_SIZE * (n))163#define CDNS_DPN_B1_SAMPLE_CTRL(n) (0x120 + CDNS_DP_SIZE * (n))164#define CDNS_DPN_B1_OFFSET_CTRL(n) (0x124 + CDNS_DP_SIZE * (n))165#define CDNS_DPN_B1_HCTRL(n) (0x128 + CDNS_DP_SIZE * (n))166#define CDNS_DPN_B1_ASYNC_CTRL(n) (0x12C + CDNS_DP_SIZE * (n))167 168#define CDNS_DPN_CONFIG_BPM BIT(18)169#define CDNS_DPN_CONFIG_BGC GENMASK(17, 16)170#define CDNS_DPN_CONFIG_WL GENMASK(12, 8)171#define CDNS_DPN_CONFIG_PORT_DAT GENMASK(3, 2)172#define CDNS_DPN_CONFIG_PORT_FLOW GENMASK(1, 0)173 174#define CDNS_DPN_SAMPLE_CTRL_SI GENMASK(15, 0)175 176#define CDNS_DPN_OFFSET_CTRL_1 GENMASK(7, 0)177#define CDNS_DPN_OFFSET_CTRL_2 GENMASK(15, 8)178 179#define CDNS_DPN_HCTRL_HSTOP GENMASK(3, 0)180#define CDNS_DPN_HCTRL_HSTART GENMASK(7, 4)181#define CDNS_DPN_HCTRL_LCTRL GENMASK(10, 8)182 183#define CDNS_PORTCTRL 0x130184#define CDNS_PORTCTRL_TEST_FAILED BIT(1)185#define CDNS_PORTCTRL_DIRN BIT(7)186#define CDNS_PORTCTRL_BANK_INVERT BIT(8)187 188#define CDNS_PORT_OFFSET 0x80189 190#define CDNS_PDI_CONFIG(n) (0x1100 + (n) * 16)191 192#define CDNS_PDI_CONFIG_SOFT_RESET BIT(24)193#define CDNS_PDI_CONFIG_CHANNEL GENMASK(15, 8)194#define CDNS_PDI_CONFIG_PORT GENMASK(4, 0)195 196/* Driver defaults */197#define CDNS_TX_TIMEOUT 500198 199#define CDNS_SCP_RX_FIFOLEVEL 0x2200 201/*202 * register accessor helpers203 */204static inline u32 cdns_readl(struct sdw_cdns *cdns, int offset)205{206 return readl(cdns->registers + offset);207}208 209static inline void cdns_writel(struct sdw_cdns *cdns, int offset, u32 value)210{211 writel(value, cdns->registers + offset);212}213 214static inline u32 cdns_ip_readl(struct sdw_cdns *cdns, int offset)215{216 return cdns_readl(cdns, cdns->ip_offset + offset);217}218 219static inline void cdns_ip_writel(struct sdw_cdns *cdns, int offset, u32 value)220{221 return cdns_writel(cdns, cdns->ip_offset + offset, value);222}223 224static inline void cdns_updatel(struct sdw_cdns *cdns,225 int offset, u32 mask, u32 val)226{227 u32 tmp;228 229 tmp = cdns_readl(cdns, offset);230 tmp = (tmp & ~mask) | val;231 cdns_writel(cdns, offset, tmp);232}233 234static inline void cdns_ip_updatel(struct sdw_cdns *cdns,235 int offset, u32 mask, u32 val)236{237 cdns_updatel(cdns, cdns->ip_offset + offset, mask, val);238}239 240static int cdns_set_wait(struct sdw_cdns *cdns, int offset, u32 mask, u32 value)241{242 int timeout = 10;243 u32 reg_read;244 245 /* Wait for bit to be set */246 do {247 reg_read = readl(cdns->registers + offset);248 if ((reg_read & mask) == value)249 return 0;250 251 timeout--;252 usleep_range(50, 100);253 } while (timeout != 0);254 255 return -ETIMEDOUT;256}257 258static int cdns_clear_bit(struct sdw_cdns *cdns, int offset, u32 value)259{260 writel(value, cdns->registers + offset);261 262 /* Wait for bit to be self cleared */263 return cdns_set_wait(cdns, offset, value, 0);264}265 266/*267 * all changes to the MCP_CONFIG, MCP_CONTROL, MCP_CMDCTRL and MCP_PHYCTRL268 * need to be confirmed with a write to MCP_CONFIG_UPDATE269 */270static int cdns_config_update(struct sdw_cdns *cdns)271{272 int ret;273 274 if (sdw_cdns_is_clock_stop(cdns)) {275 dev_err(cdns->dev, "Cannot program MCP_CONFIG_UPDATE in ClockStopMode\n");276 return -EINVAL;277 }278 279 ret = cdns_clear_bit(cdns, CDNS_MCP_CONFIG_UPDATE,280 CDNS_MCP_CONFIG_UPDATE_BIT);281 if (ret < 0)282 dev_err(cdns->dev, "Config update timedout\n");283 284 return ret;285}286 287/**288 * sdw_cdns_config_update() - Update configurations289 * @cdns: Cadence instance290 */291void sdw_cdns_config_update(struct sdw_cdns *cdns)292{293 /* commit changes */294 cdns_writel(cdns, CDNS_MCP_CONFIG_UPDATE, CDNS_MCP_CONFIG_UPDATE_BIT);295}296EXPORT_SYMBOL(sdw_cdns_config_update);297 298/**299 * sdw_cdns_config_update_set_wait() - wait until configuration update bit is self-cleared300 * @cdns: Cadence instance301 */302int sdw_cdns_config_update_set_wait(struct sdw_cdns *cdns)303{304 /* the hardware recommendation is to wait at least 300us */305 return cdns_set_wait(cdns, CDNS_MCP_CONFIG_UPDATE,306 CDNS_MCP_CONFIG_UPDATE_BIT, 0);307}308EXPORT_SYMBOL(sdw_cdns_config_update_set_wait);309 310/*311 * debugfs312 */313#ifdef CONFIG_DEBUG_FS314 315#define RD_BUF (2 * PAGE_SIZE)316 317static ssize_t cdns_sprintf(struct sdw_cdns *cdns,318 char *buf, size_t pos, unsigned int reg)319{320 return scnprintf(buf + pos, RD_BUF - pos,321 "%4x\t%8x\n", reg, cdns_readl(cdns, reg));322}323 324static int cdns_reg_show(struct seq_file *s, void *data)325{326 struct sdw_cdns *cdns = s->private;327 ssize_t ret;328 int num_ports;329 int i, j;330 331 char *buf __free(kfree) = kzalloc(RD_BUF, GFP_KERNEL);332 if (!buf)333 return -ENOMEM;334 335 ret = scnprintf(buf, RD_BUF, "Register Value\n");336 ret += scnprintf(buf + ret, RD_BUF - ret, "\nMCP Registers\n");337 /* 8 MCP registers */338 for (i = CDNS_MCP_CONFIG; i <= CDNS_MCP_PHYCTRL; i += sizeof(u32))339 ret += cdns_sprintf(cdns, buf, ret, i);340 341 ret += scnprintf(buf + ret, RD_BUF - ret,342 "\nStatus & Intr Registers\n");343 /* 13 Status & Intr registers (offsets 0x70 and 0x74 not defined) */344 for (i = CDNS_MCP_STAT; i <= CDNS_MCP_FIFOSTAT; i += sizeof(u32))345 ret += cdns_sprintf(cdns, buf, ret, i);346 347 ret += scnprintf(buf + ret, RD_BUF - ret,348 "\nSSP & Clk ctrl Registers\n");349 ret += cdns_sprintf(cdns, buf, ret, CDNS_MCP_SSP_CTRL0);350 ret += cdns_sprintf(cdns, buf, ret, CDNS_MCP_SSP_CTRL1);351 ret += cdns_sprintf(cdns, buf, ret, CDNS_MCP_CLK_CTRL0);352 ret += cdns_sprintf(cdns, buf, ret, CDNS_MCP_CLK_CTRL1);353 354 ret += scnprintf(buf + ret, RD_BUF - ret,355 "\nDPn B0 Registers\n");356 357 num_ports = cdns->num_ports;358 359 for (i = 0; i < num_ports; i++) {360 ret += scnprintf(buf + ret, RD_BUF - ret,361 "\nDP-%d\n", i);362 for (j = CDNS_DPN_B0_CONFIG(i);363 j < CDNS_DPN_B0_ASYNC_CTRL(i); j += sizeof(u32))364 ret += cdns_sprintf(cdns, buf, ret, j);365 }366 367 ret += scnprintf(buf + ret, RD_BUF - ret,368 "\nDPn B1 Registers\n");369 for (i = 0; i < num_ports; i++) {370 ret += scnprintf(buf + ret, RD_BUF - ret,371 "\nDP-%d\n", i);372 373 for (j = CDNS_DPN_B1_CONFIG(i);374 j < CDNS_DPN_B1_ASYNC_CTRL(i); j += sizeof(u32))375 ret += cdns_sprintf(cdns, buf, ret, j);376 }377 378 ret += scnprintf(buf + ret, RD_BUF - ret,379 "\nDPn Control Registers\n");380 for (i = 0; i < num_ports; i++)381 ret += cdns_sprintf(cdns, buf, ret,382 CDNS_PORTCTRL + i * CDNS_PORT_OFFSET);383 384 ret += scnprintf(buf + ret, RD_BUF - ret,385 "\nPDIn Config Registers\n");386 387 /* number of PDI and ports is interchangeable */388 for (i = 0; i < num_ports; i++)389 ret += cdns_sprintf(cdns, buf, ret, CDNS_PDI_CONFIG(i));390 391 seq_printf(s, "%s", buf);392 393 return 0;394}395DEFINE_SHOW_ATTRIBUTE(cdns_reg);396 397static int cdns_hw_reset(void *data, u64 value)398{399 struct sdw_cdns *cdns = data;400 int ret;401 402 if (value != 1)403 return -EINVAL;404 405 /* Userspace changed the hardware state behind the kernel's back */406 add_taint(TAINT_USER, LOCKDEP_STILL_OK);407 408 ret = sdw_cdns_exit_reset(cdns);409 410 dev_dbg(cdns->dev, "link hw_reset done: %d\n", ret);411 412 return ret;413}414 415DEFINE_DEBUGFS_ATTRIBUTE(cdns_hw_reset_fops, NULL, cdns_hw_reset, "%llu\n");416 417static int cdns_parity_error_injection(void *data, u64 value)418{419 struct sdw_cdns *cdns = data;420 struct sdw_bus *bus;421 int ret;422 423 if (value != 1)424 return -EINVAL;425 426 bus = &cdns->bus;427 428 /*429 * Resume Master device. If this results in a bus reset, the430 * Slave devices will re-attach and be re-enumerated.431 */432 ret = pm_runtime_resume_and_get(bus->dev);433 if (ret < 0 && ret != -EACCES) {434 dev_err_ratelimited(cdns->dev,435 "pm_runtime_resume_and_get failed in %s, ret %d\n",436 __func__, ret);437 return ret;438 }439 440 /*441 * wait long enough for Slave(s) to be in steady state. This442 * does not need to be super precise.443 */444 msleep(200);445 446 /*447 * Take the bus lock here to make sure that any bus transactions448 * will be queued while we inject a parity error on a dummy read449 */450 mutex_lock(&bus->bus_lock);451 452 /* program hardware to inject parity error */453 cdns_ip_updatel(cdns, CDNS_IP_MCP_CMDCTRL,454 CDNS_IP_MCP_CMDCTRL_INSERT_PARITY_ERR,455 CDNS_IP_MCP_CMDCTRL_INSERT_PARITY_ERR);456 457 /* commit changes */458 ret = cdns_clear_bit(cdns, CDNS_MCP_CONFIG_UPDATE, CDNS_MCP_CONFIG_UPDATE_BIT);459 if (ret < 0)460 goto unlock;461 462 /* do a broadcast dummy read to avoid bus clashes */463 ret = sdw_bread_no_pm_unlocked(&cdns->bus, 0xf, SDW_SCP_DEVID_0);464 dev_info(cdns->dev, "parity error injection, read: %d\n", ret);465 466 /* program hardware to disable parity error */467 cdns_ip_updatel(cdns, CDNS_IP_MCP_CMDCTRL,468 CDNS_IP_MCP_CMDCTRL_INSERT_PARITY_ERR,469 0);470 471 /* commit changes */472 ret = cdns_clear_bit(cdns, CDNS_MCP_CONFIG_UPDATE, CDNS_MCP_CONFIG_UPDATE_BIT);473 if (ret < 0)474 goto unlock;475 476 /* Userspace changed the hardware state behind the kernel's back */477 add_taint(TAINT_USER, LOCKDEP_STILL_OK);478 479unlock:480 /* Continue bus operation with parity error injection disabled */481 mutex_unlock(&bus->bus_lock);482 483 /*484 * allow Master device to enter pm_runtime suspend. This may485 * also result in Slave devices suspending.486 */487 pm_runtime_mark_last_busy(bus->dev);488 pm_runtime_put_autosuspend(bus->dev);489 490 return 0;491}492 493DEFINE_DEBUGFS_ATTRIBUTE(cdns_parity_error_fops, NULL,494 cdns_parity_error_injection, "%llu\n");495 496static int cdns_set_pdi_loopback_source(void *data, u64 value)497{498 struct sdw_cdns *cdns = data;499 unsigned int pdi_out_num = cdns->pcm.num_bd + cdns->pcm.num_out;500 501 if (value > pdi_out_num)502 return -EINVAL;503 504 /* Userspace changed the hardware state behind the kernel's back */505 add_taint(TAINT_USER, LOCKDEP_STILL_OK);506 507 cdns->pdi_loopback_source = value;508 509 return 0;510}511DEFINE_DEBUGFS_ATTRIBUTE(cdns_pdi_loopback_source_fops, NULL, cdns_set_pdi_loopback_source, "%llu\n");512 513static int cdns_set_pdi_loopback_target(void *data, u64 value)514{515 struct sdw_cdns *cdns = data;516 unsigned int pdi_in_num = cdns->pcm.num_bd + cdns->pcm.num_in;517 518 if (value > pdi_in_num)519 return -EINVAL;520 521 /* Userspace changed the hardware state behind the kernel's back */522 add_taint(TAINT_USER, LOCKDEP_STILL_OK);523 524 cdns->pdi_loopback_target = value;525 526 return 0;527}528DEFINE_DEBUGFS_ATTRIBUTE(cdns_pdi_loopback_target_fops, NULL, cdns_set_pdi_loopback_target, "%llu\n");529 530/**531 * sdw_cdns_debugfs_init() - Cadence debugfs init532 * @cdns: Cadence instance533 * @root: debugfs root534 */535void sdw_cdns_debugfs_init(struct sdw_cdns *cdns, struct dentry *root)536{537 debugfs_create_file("cdns-registers", 0400, root, cdns, &cdns_reg_fops);538 539 debugfs_create_file("cdns-hw-reset", 0200, root, cdns,540 &cdns_hw_reset_fops);541 542 debugfs_create_file("cdns-parity-error-injection", 0200, root, cdns,543 &cdns_parity_error_fops);544 545 cdns->pdi_loopback_source = -1;546 cdns->pdi_loopback_target = -1;547 548 debugfs_create_file("cdns-pdi-loopback-source", 0200, root, cdns,549 &cdns_pdi_loopback_source_fops);550 551 debugfs_create_file("cdns-pdi-loopback-target", 0200, root, cdns,552 &cdns_pdi_loopback_target_fops);553 554}555EXPORT_SYMBOL_GPL(sdw_cdns_debugfs_init);556 557#endif /* CONFIG_DEBUG_FS */558 559/*560 * IO Calls561 */562static enum sdw_command_response563cdns_fill_msg_resp(struct sdw_cdns *cdns,564 struct sdw_msg *msg, int count, int offset)565{566 int nack = 0, no_ack = 0;567 int i;568 569 /* check message response */570 for (i = 0; i < count; i++) {571 if (!(cdns->response_buf[i] & CDNS_MCP_RESP_ACK)) {572 no_ack = 1;573 dev_vdbg(cdns->dev, "Msg Ack not received, cmd %d\n", i);574 }575 if (cdns->response_buf[i] & CDNS_MCP_RESP_NACK) {576 nack = 1;577 dev_err_ratelimited(cdns->dev, "Msg NACK received, cmd %d\n", i);578 }579 }580 581 if (nack) {582 dev_err_ratelimited(cdns->dev, "Msg NACKed for Slave %d\n", msg->dev_num);583 return SDW_CMD_FAIL;584 }585 586 if (no_ack) {587 dev_dbg_ratelimited(cdns->dev, "Msg ignored for Slave %d\n", msg->dev_num);588 return SDW_CMD_IGNORED;589 }590 591 if (msg->flags == SDW_MSG_FLAG_READ) {592 /* fill response */593 for (i = 0; i < count; i++)594 msg->buf[i + offset] = FIELD_GET(CDNS_MCP_RESP_RDATA,595 cdns->response_buf[i]);596 }597 598 return SDW_CMD_OK;599}600 601static void cdns_read_response(struct sdw_cdns *cdns)602{603 u32 num_resp, cmd_base;604 int i;605 606 /* RX_FIFO_AVAIL can be 2 entries more than the FIFO size */607 BUILD_BUG_ON(ARRAY_SIZE(cdns->response_buf) < CDNS_MCP_CMD_LEN + 2);608 609 num_resp = cdns_readl(cdns, CDNS_MCP_FIFOSTAT);610 num_resp &= CDNS_MCP_RX_FIFO_AVAIL;611 if (num_resp > ARRAY_SIZE(cdns->response_buf)) {612 dev_warn(cdns->dev, "RX AVAIL %d too long\n", num_resp);613 num_resp = ARRAY_SIZE(cdns->response_buf);614 }615 616 cmd_base = CDNS_IP_MCP_CMD_BASE;617 618 for (i = 0; i < num_resp; i++) {619 cdns->response_buf[i] = cdns_ip_readl(cdns, cmd_base);620 cmd_base += CDNS_MCP_CMD_WORD_LEN;621 }622}623 624static enum sdw_command_response625_cdns_xfer_msg(struct sdw_cdns *cdns, struct sdw_msg *msg, int cmd,626 int offset, int count, bool defer)627{628 unsigned long time;629 u32 base, i, data;630 u16 addr;631 632 /* Program the watermark level for RX FIFO */633 if (cdns->msg_count != count) {634 cdns_writel(cdns, CDNS_MCP_FIFOLEVEL, count);635 cdns->msg_count = count;636 }637 638 base = CDNS_IP_MCP_CMD_BASE;639 addr = msg->addr + offset;640 641 for (i = 0; i < count; i++) {642 data = FIELD_PREP(CDNS_MCP_CMD_DEV_ADDR, msg->dev_num);643 data |= FIELD_PREP(CDNS_MCP_CMD_COMMAND, cmd);644 data |= FIELD_PREP(CDNS_MCP_CMD_REG_ADDR, addr);645 addr++;646 647 if (msg->flags == SDW_MSG_FLAG_WRITE)648 data |= msg->buf[i + offset];649 650 data |= FIELD_PREP(CDNS_MCP_CMD_SSP_TAG, msg->ssp_sync);651 cdns_ip_writel(cdns, base, data);652 base += CDNS_MCP_CMD_WORD_LEN;653 }654 655 if (defer)656 return SDW_CMD_OK;657 658 /* wait for timeout or response */659 time = wait_for_completion_timeout(&cdns->tx_complete,660 msecs_to_jiffies(CDNS_TX_TIMEOUT));661 if (!time) {662 dev_err(cdns->dev, "IO transfer timed out, cmd %d device %d addr %x len %d\n",663 cmd, msg->dev_num, msg->addr, msg->len);664 msg->len = 0;665 666 /* Drain anything in the RX_FIFO */667 cdns_read_response(cdns);668 669 return SDW_CMD_TIMEOUT;670 }671 672 return cdns_fill_msg_resp(cdns, msg, count, offset);673}674 675static enum sdw_command_response676cdns_program_scp_addr(struct sdw_cdns *cdns, struct sdw_msg *msg)677{678 int nack = 0, no_ack = 0;679 unsigned long time;680 u32 data[2], base;681 int i;682 683 /* Program the watermark level for RX FIFO */684 if (cdns->msg_count != CDNS_SCP_RX_FIFOLEVEL) {685 cdns_writel(cdns, CDNS_MCP_FIFOLEVEL, CDNS_SCP_RX_FIFOLEVEL);686 cdns->msg_count = CDNS_SCP_RX_FIFOLEVEL;687 }688 689 data[0] = FIELD_PREP(CDNS_MCP_CMD_DEV_ADDR, msg->dev_num);690 data[0] |= FIELD_PREP(CDNS_MCP_CMD_COMMAND, 0x3);691 data[1] = data[0];692 693 data[0] |= FIELD_PREP(CDNS_MCP_CMD_REG_ADDR, SDW_SCP_ADDRPAGE1);694 data[1] |= FIELD_PREP(CDNS_MCP_CMD_REG_ADDR, SDW_SCP_ADDRPAGE2);695 696 data[0] |= msg->addr_page1;697 data[1] |= msg->addr_page2;698 699 base = CDNS_IP_MCP_CMD_BASE;700 cdns_ip_writel(cdns, base, data[0]);701 base += CDNS_MCP_CMD_WORD_LEN;702 cdns_ip_writel(cdns, base, data[1]);703 704 time = wait_for_completion_timeout(&cdns->tx_complete,705 msecs_to_jiffies(CDNS_TX_TIMEOUT));706 if (!time) {707 dev_err(cdns->dev, "SCP Msg trf timed out\n");708 msg->len = 0;709 return SDW_CMD_TIMEOUT;710 }711 712 /* check response the writes */713 for (i = 0; i < 2; i++) {714 if (!(cdns->response_buf[i] & CDNS_MCP_RESP_ACK)) {715 no_ack = 1;716 dev_err(cdns->dev, "Program SCP Ack not received\n");717 if (cdns->response_buf[i] & CDNS_MCP_RESP_NACK) {718 nack = 1;719 dev_err(cdns->dev, "Program SCP NACK received\n");720 }721 }722 }723 724 /* For NACK, NO ack, don't return err if we are in Broadcast mode */725 if (nack) {726 dev_err_ratelimited(cdns->dev,727 "SCP_addrpage NACKed for Slave %d\n", msg->dev_num);728 return SDW_CMD_FAIL;729 }730 731 if (no_ack) {732 dev_dbg_ratelimited(cdns->dev,733 "SCP_addrpage ignored for Slave %d\n", msg->dev_num);734 return SDW_CMD_IGNORED;735 }736 737 return SDW_CMD_OK;738}739 740static int cdns_prep_msg(struct sdw_cdns *cdns, struct sdw_msg *msg, int *cmd)741{742 int ret;743 744 if (msg->page) {745 ret = cdns_program_scp_addr(cdns, msg);746 if (ret) {747 msg->len = 0;748 return ret;749 }750 }751 752 switch (msg->flags) {753 case SDW_MSG_FLAG_READ:754 *cmd = CDNS_MCP_CMD_READ;755 break;756 757 case SDW_MSG_FLAG_WRITE:758 *cmd = CDNS_MCP_CMD_WRITE;759 break;760 761 default:762 dev_err(cdns->dev, "Invalid msg cmd: %d\n", msg->flags);763 return -EINVAL;764 }765 766 return 0;767}768 769enum sdw_command_response770cdns_xfer_msg(struct sdw_bus *bus, struct sdw_msg *msg)771{772 struct sdw_cdns *cdns = bus_to_cdns(bus);773 int cmd = 0, ret, i;774 775 ret = cdns_prep_msg(cdns, msg, &cmd);776 if (ret)777 return SDW_CMD_FAIL_OTHER;778 779 for (i = 0; i < msg->len / CDNS_MCP_CMD_LEN; i++) {780 ret = _cdns_xfer_msg(cdns, msg, cmd, i * CDNS_MCP_CMD_LEN,781 CDNS_MCP_CMD_LEN, false);782 if (ret != SDW_CMD_OK)783 return ret;784 }785 786 if (!(msg->len % CDNS_MCP_CMD_LEN))787 return SDW_CMD_OK;788 789 return _cdns_xfer_msg(cdns, msg, cmd, i * CDNS_MCP_CMD_LEN,790 msg->len % CDNS_MCP_CMD_LEN, false);791}792EXPORT_SYMBOL(cdns_xfer_msg);793 794enum sdw_command_response795cdns_xfer_msg_defer(struct sdw_bus *bus)796{797 struct sdw_cdns *cdns = bus_to_cdns(bus);798 struct sdw_defer *defer = &bus->defer_msg;799 struct sdw_msg *msg = defer->msg;800 int cmd = 0, ret;801 802 /* for defer only 1 message is supported */803 if (msg->len > 1)804 return -ENOTSUPP;805 806 ret = cdns_prep_msg(cdns, msg, &cmd);807 if (ret)808 return SDW_CMD_FAIL_OTHER;809 810 return _cdns_xfer_msg(cdns, msg, cmd, 0, msg->len, true);811}812EXPORT_SYMBOL(cdns_xfer_msg_defer);813 814u32 cdns_read_ping_status(struct sdw_bus *bus)815{816 struct sdw_cdns *cdns = bus_to_cdns(bus);817 818 return cdns_readl(cdns, CDNS_MCP_SLAVE_STAT);819}820EXPORT_SYMBOL(cdns_read_ping_status);821 822/*823 * IRQ handling824 */825 826static int cdns_update_slave_status(struct sdw_cdns *cdns,827 u64 slave_intstat)828{829 enum sdw_slave_status status[SDW_MAX_DEVICES + 1];830 bool is_slave = false;831 u32 mask;832 u32 val;833 int i, set_status;834 835 memset(status, 0, sizeof(status));836 837 for (i = 0; i <= SDW_MAX_DEVICES; i++) {838 mask = (slave_intstat >> (i * CDNS_MCP_SLAVE_STATUS_NUM)) &839 CDNS_MCP_SLAVE_STATUS_BITS;840 841 set_status = 0;842 843 if (mask) {844 is_slave = true;845 846 if (mask & CDNS_MCP_SLAVE_INTSTAT_RESERVED) {847 status[i] = SDW_SLAVE_RESERVED;848 set_status++;849 }850 851 if (mask & CDNS_MCP_SLAVE_INTSTAT_ATTACHED) {852 status[i] = SDW_SLAVE_ATTACHED;853 set_status++;854 }855 856 if (mask & CDNS_MCP_SLAVE_INTSTAT_ALERT) {857 status[i] = SDW_SLAVE_ALERT;858 set_status++;859 }860 861 if (mask & CDNS_MCP_SLAVE_INTSTAT_NPRESENT) {862 status[i] = SDW_SLAVE_UNATTACHED;863 set_status++;864 }865 }866 867 /*868 * check that there was a single reported Slave status and when869 * there is not use the latest status extracted from PING commands870 */871 if (set_status != 1) {872 val = cdns_readl(cdns, CDNS_MCP_SLAVE_STAT);873 val >>= (i * 2);874 875 switch (val & 0x3) {876 case 0:877 status[i] = SDW_SLAVE_UNATTACHED;878 break;879 case 1:880 status[i] = SDW_SLAVE_ATTACHED;881 break;882 case 2:883 status[i] = SDW_SLAVE_ALERT;884 break;885 case 3:886 default:887 status[i] = SDW_SLAVE_RESERVED;888 break;889 }890 }891 }892 893 if (is_slave) {894 int ret;895 896 mutex_lock(&cdns->status_update_lock);897 ret = sdw_handle_slave_status(&cdns->bus, status);898 mutex_unlock(&cdns->status_update_lock);899 return ret;900 }901 902 return 0;903}904 905/**906 * sdw_cdns_irq() - Cadence interrupt handler907 * @irq: irq number908 * @dev_id: irq context909 */910irqreturn_t sdw_cdns_irq(int irq, void *dev_id)911{912 struct sdw_cdns *cdns = dev_id;913 u32 int_status;914 915 /* Check if the link is up */916 if (!cdns->link_up)917 return IRQ_NONE;918 919 int_status = cdns_readl(cdns, CDNS_MCP_INTSTAT);920 921 /* check for reserved values read as zero */922 if (int_status & CDNS_MCP_INT_RESERVED)923 return IRQ_NONE;924 925 if (!(int_status & CDNS_MCP_INT_IRQ))926 return IRQ_NONE;927 928 if (int_status & CDNS_MCP_INT_RX_WL) {929 struct sdw_bus *bus = &cdns->bus;930 struct sdw_defer *defer = &bus->defer_msg;931 932 cdns_read_response(cdns);933 934 if (defer && defer->msg) {935 cdns_fill_msg_resp(cdns, defer->msg,936 defer->length, 0);937 complete(&defer->complete);938 } else {939 complete(&cdns->tx_complete);940 }941 }942 943 if (int_status & CDNS_MCP_INT_PARITY) {944 /* Parity error detected by Master */945 dev_err_ratelimited(cdns->dev, "Parity error\n");946 }947 948 if (int_status & CDNS_MCP_INT_CTRL_CLASH) {949 /* Slave is driving bit slot during control word */950 dev_err_ratelimited(cdns->dev, "Bus clash for control word\n");951 }952 953 if (int_status & CDNS_MCP_INT_DATA_CLASH) {954 /*955 * Multiple slaves trying to drive bit slot, or issue with956 * ownership of data bits or Slave gone bonkers957 */958 dev_err_ratelimited(cdns->dev, "Bus clash for data word\n");959 }960 961 if (cdns->bus.params.m_data_mode != SDW_PORT_DATA_MODE_NORMAL &&962 int_status & CDNS_MCP_INT_DPINT) {963 u32 port_intstat;964 965 /* just log which ports report an error */966 port_intstat = cdns_readl(cdns, CDNS_MCP_PORT_INTSTAT);967 dev_err_ratelimited(cdns->dev, "DP interrupt: PortIntStat %8x\n",968 port_intstat);969 970 /* clear status w/ write1 */971 cdns_writel(cdns, CDNS_MCP_PORT_INTSTAT, port_intstat);972 }973 974 if (int_status & CDNS_MCP_INT_SLAVE_MASK) {975 /* Mask the Slave interrupt and wake thread */976 cdns_updatel(cdns, CDNS_MCP_INTMASK,977 CDNS_MCP_INT_SLAVE_MASK, 0);978 979 int_status &= ~CDNS_MCP_INT_SLAVE_MASK;980 981 /*982 * Deal with possible race condition between interrupt983 * handling and disabling interrupts on suspend.984 *985 * If the master is in the process of disabling986 * interrupts, don't schedule a workqueue987 */988 if (cdns->interrupt_enabled)989 schedule_work(&cdns->work);990 }991 992 cdns_writel(cdns, CDNS_MCP_INTSTAT, int_status);993 return IRQ_HANDLED;994}995EXPORT_SYMBOL(sdw_cdns_irq);996 997static void cdns_check_attached_status_dwork(struct work_struct *work)998{999 struct sdw_cdns *cdns =1000 container_of(work, struct sdw_cdns, attach_dwork.work);1001 enum sdw_slave_status status[SDW_MAX_DEVICES + 1];1002 u32 val;1003 int ret;1004 int i;1005 1006 val = cdns_readl(cdns, CDNS_MCP_SLAVE_STAT);1007 1008 for (i = 0; i <= SDW_MAX_DEVICES; i++) {1009 status[i] = val & 0x3;1010 if (status[i])1011 dev_dbg(cdns->dev, "Peripheral %d status: %d\n", i, status[i]);1012 val >>= 2;1013 }1014 1015 mutex_lock(&cdns->status_update_lock);1016 ret = sdw_handle_slave_status(&cdns->bus, status);1017 mutex_unlock(&cdns->status_update_lock);1018 if (ret < 0)1019 dev_err(cdns->dev, "%s: sdw_handle_slave_status failed: %d\n", __func__, ret);1020}1021 1022/**1023 * cdns_update_slave_status_work - update slave status in a work since we will need to handle1024 * other interrupts eg. CDNS_MCP_INT_RX_WL during the update slave1025 * process.1026 * @work: cdns worker thread1027 */1028static void cdns_update_slave_status_work(struct work_struct *work)1029{1030 struct sdw_cdns *cdns =1031 container_of(work, struct sdw_cdns, work);1032 u32 slave0, slave1;1033 u64 slave_intstat;1034 u32 device0_status;1035 int retry_count = 0;1036 1037 /*1038 * Clear main interrupt first so we don't lose any assertions1039 * that happen during this function.1040 */1041 cdns_writel(cdns, CDNS_MCP_INTSTAT, CDNS_MCP_INT_SLAVE_MASK);1042 1043 slave0 = cdns_readl(cdns, CDNS_MCP_SLAVE_INTSTAT0);1044 slave1 = cdns_readl(cdns, CDNS_MCP_SLAVE_INTSTAT1);1045 1046 /*1047 * Clear the bits before handling so we don't lose any1048 * bits that re-assert.1049 */1050 cdns_writel(cdns, CDNS_MCP_SLAVE_INTSTAT0, slave0);1051 cdns_writel(cdns, CDNS_MCP_SLAVE_INTSTAT1, slave1);1052 1053 /* combine the two status */1054 slave_intstat = ((u64)slave1 << 32) | slave0;1055 1056 dev_dbg_ratelimited(cdns->dev, "Slave status change: 0x%llx\n", slave_intstat);1057 1058update_status:1059 cdns_update_slave_status(cdns, slave_intstat);1060 1061 /*1062 * When there is more than one peripheral per link, it's1063 * possible that a deviceB becomes attached after we deal with1064 * the attachment of deviceA. Since the hardware does a1065 * logical AND, the attachment of the second device does not1066 * change the status seen by the driver.1067 *1068 * In that case, clearing the registers above would result in1069 * the deviceB never being detected - until a change of status1070 * is observed on the bus.1071 *1072 * To avoid this race condition, re-check if any device0 needs1073 * attention with PING commands. There is no need to check for1074 * ALERTS since they are not allowed until a non-zero1075 * device_number is assigned.1076 *1077 * Do not clear the INTSTAT0/1. While looping to enumerate devices on1078 * #0 there could be status changes on other devices - these must1079 * be kept in the INTSTAT so they can be handled when all #0 devices1080 * have been handled.1081 */1082 1083 device0_status = cdns_readl(cdns, CDNS_MCP_SLAVE_STAT);1084 device0_status &= 3;1085 1086 if (device0_status == SDW_SLAVE_ATTACHED) {1087 if (retry_count++ < SDW_MAX_DEVICES) {1088 dev_dbg_ratelimited(cdns->dev,1089 "Device0 detected after clearing status, iteration %d\n",1090 retry_count);1091 slave_intstat = CDNS_MCP_SLAVE_INTSTAT_ATTACHED;1092 goto update_status;1093 } else {1094 dev_err_ratelimited(cdns->dev,1095 "Device0 detected after %d iterations\n",1096 retry_count);1097 }1098 }1099 1100 /* unmask Slave interrupt now */1101 cdns_updatel(cdns, CDNS_MCP_INTMASK,1102 CDNS_MCP_INT_SLAVE_MASK, CDNS_MCP_INT_SLAVE_MASK);1103 1104}1105 1106/* paranoia check to make sure self-cleared bits are indeed cleared */1107void sdw_cdns_check_self_clearing_bits(struct sdw_cdns *cdns, const char *string,1108 bool initial_delay, int reset_iterations)1109{1110 u32 ip_mcp_control;1111 u32 mcp_control;1112 u32 mcp_config_update;1113 int i;1114 1115 if (initial_delay)1116 usleep_range(1000, 1500);1117 1118 ip_mcp_control = cdns_ip_readl(cdns, CDNS_IP_MCP_CONTROL);1119 1120 /* the following bits should be cleared immediately */1121 if (ip_mcp_control & CDNS_IP_MCP_CONTROL_SW_RST)1122 dev_err(cdns->dev, "%s failed: IP_MCP_CONTROL_SW_RST is not cleared\n", string);1123 1124 mcp_control = cdns_readl(cdns, CDNS_MCP_CONTROL);1125 1126 /* the following bits should be cleared immediately */1127 if (mcp_control & CDNS_MCP_CONTROL_CMD_RST)1128 dev_err(cdns->dev, "%s failed: MCP_CONTROL_CMD_RST is not cleared\n", string);1129 if (mcp_control & CDNS_MCP_CONTROL_SOFT_RST)1130 dev_err(cdns->dev, "%s failed: MCP_CONTROL_SOFT_RST is not cleared\n", string);1131 if (mcp_control & CDNS_MCP_CONTROL_CLK_STOP_CLR)1132 dev_err(cdns->dev, "%s failed: MCP_CONTROL_CLK_STOP_CLR is not cleared\n", string);1133 1134 mcp_config_update = cdns_readl(cdns, CDNS_MCP_CONFIG_UPDATE);1135 if (mcp_config_update & CDNS_MCP_CONFIG_UPDATE_BIT)1136 dev_err(cdns->dev, "%s failed: MCP_CONFIG_UPDATE_BIT is not cleared\n", string);1137 1138 i = 0;1139 while (mcp_control & CDNS_MCP_CONTROL_HW_RST) {1140 if (i == reset_iterations) {1141 dev_err(cdns->dev, "%s failed: MCP_CONTROL_HW_RST is not cleared\n", string);1142 break;1143 }1144 1145 dev_dbg(cdns->dev, "%s: MCP_CONTROL_HW_RST is not cleared at iteration %d\n", string, i);1146 i++;1147 1148 usleep_range(1000, 1500);1149 mcp_control = cdns_readl(cdns, CDNS_MCP_CONTROL);1150 }1151 1152}1153EXPORT_SYMBOL(sdw_cdns_check_self_clearing_bits);1154 1155/*1156 * init routines1157 */1158 1159/**1160 * sdw_cdns_exit_reset() - Program reset parameters and start bus operations1161 * @cdns: Cadence instance1162 */1163int sdw_cdns_exit_reset(struct sdw_cdns *cdns)1164{1165 /* keep reset delay unchanged to 4096 cycles */1166 1167 /* use hardware generated reset */1168 cdns_updatel(cdns, CDNS_MCP_CONTROL,1169 CDNS_MCP_CONTROL_HW_RST,1170 CDNS_MCP_CONTROL_HW_RST);1171 1172 /* commit changes */1173 return cdns_config_update(cdns);1174}1175EXPORT_SYMBOL(sdw_cdns_exit_reset);1176 1177/**1178 * cdns_enable_slave_interrupts() - Enable SDW slave interrupts1179 * @cdns: Cadence instance1180 * @state: boolean for true/false1181 */1182static void cdns_enable_slave_interrupts(struct sdw_cdns *cdns, bool state)1183{1184 u32 mask;1185 1186 mask = cdns_readl(cdns, CDNS_MCP_INTMASK);1187 if (state)1188 mask |= CDNS_MCP_INT_SLAVE_MASK;1189 else1190 mask &= ~CDNS_MCP_INT_SLAVE_MASK;1191 1192 cdns_writel(cdns, CDNS_MCP_INTMASK, mask);1193}1194 1195/**1196 * sdw_cdns_enable_interrupt() - Enable SDW interrupts1197 * @cdns: Cadence instance1198 * @state: True if we are trying to enable interrupt.1199 */1200int sdw_cdns_enable_interrupt(struct sdw_cdns *cdns, bool state)1201{1202 u32 slave_intmask0 = 0;1203 u32 slave_intmask1 = 0;1204 u32 mask = 0;1205 1206 if (!state)1207 goto update_masks;1208 1209 slave_intmask0 = CDNS_MCP_SLAVE_INTMASK0_MASK;1210 slave_intmask1 = CDNS_MCP_SLAVE_INTMASK1_MASK;1211 1212 /* enable detection of all slave state changes */1213 mask = CDNS_MCP_INT_SLAVE_MASK;1214 1215 /* enable detection of bus issues */1216 mask |= CDNS_MCP_INT_CTRL_CLASH | CDNS_MCP_INT_DATA_CLASH |1217 CDNS_MCP_INT_PARITY;1218 1219 /* port interrupt limited to test modes for now */1220 if (cdns->bus.params.m_data_mode != SDW_PORT_DATA_MODE_NORMAL)1221 mask |= CDNS_MCP_INT_DPINT;1222 1223 /* enable detection of RX fifo level */1224 mask |= CDNS_MCP_INT_RX_WL;1225 1226 /*1227 * CDNS_MCP_INT_IRQ needs to be set otherwise all previous1228 * settings are irrelevant1229 */1230 mask |= CDNS_MCP_INT_IRQ;1231 1232 if (interrupt_mask) /* parameter override */1233 mask = interrupt_mask;1234 1235update_masks:1236 /* clear slave interrupt status before enabling interrupt */1237 if (state) {1238 u32 slave_state;1239 1240 slave_state = cdns_readl(cdns, CDNS_MCP_SLAVE_INTSTAT0);1241 cdns_writel(cdns, CDNS_MCP_SLAVE_INTSTAT0, slave_state);1242 slave_state = cdns_readl(cdns, CDNS_MCP_SLAVE_INTSTAT1);1243 cdns_writel(cdns, CDNS_MCP_SLAVE_INTSTAT1, slave_state);1244 }1245 cdns->interrupt_enabled = state;1246 1247 /*1248 * Complete any on-going status updates before updating masks,1249 * and cancel queued status updates.1250 *1251 * There could be a race with a new interrupt thrown before1252 * the 3 mask updates below are complete, so in the interrupt1253 * we use the 'interrupt_enabled' status to prevent new work1254 * from being queued.1255 */1256 if (!state)1257 cancel_work_sync(&cdns->work);1258 1259 cdns_writel(cdns, CDNS_MCP_SLAVE_INTMASK0, slave_intmask0);1260 cdns_writel(cdns, CDNS_MCP_SLAVE_INTMASK1, slave_intmask1);1261 cdns_writel(cdns, CDNS_MCP_INTMASK, mask);1262 1263 return 0;1264}1265EXPORT_SYMBOL(sdw_cdns_enable_interrupt);1266 1267static int cdns_allocate_pdi(struct sdw_cdns *cdns,1268 struct sdw_cdns_pdi **stream,1269 u32 num)1270{1271 struct sdw_cdns_pdi *pdi;1272 int i;1273 1274 if (!num)1275 return 0;1276 1277 pdi = devm_kcalloc(cdns->dev, num, sizeof(*pdi), GFP_KERNEL);1278 if (!pdi)1279 return -ENOMEM;1280 1281 for (i = 0; i < num; i++) {1282 pdi[i].num = i;1283 }1284 1285 *stream = pdi;1286 return 0;1287}1288 1289/**1290 * sdw_cdns_pdi_init() - PDI initialization routine1291 *1292 * @cdns: Cadence instance1293 * @config: Stream configurations1294 */1295int sdw_cdns_pdi_init(struct sdw_cdns *cdns,1296 struct sdw_cdns_stream_config config)1297{1298 struct sdw_cdns_streams *stream;1299 int ret;1300 1301 cdns->pcm.num_bd = config.pcm_bd;1302 cdns->pcm.num_in = config.pcm_in;1303 cdns->pcm.num_out = config.pcm_out;1304 1305 /* Allocate PDIs for PCMs */1306 stream = &cdns->pcm;1307 1308 /* we allocate PDI0 and PDI1 which are used for Bulk */1309 ret = cdns_allocate_pdi(cdns, &stream->bd, stream->num_bd);1310 if (ret)1311 return ret;1312 1313 ret = cdns_allocate_pdi(cdns, &stream->in, stream->num_in);1314 if (ret)1315 return ret;1316 1317 ret = cdns_allocate_pdi(cdns, &stream->out, stream->num_out);1318 if (ret)1319 return ret;1320 1321 /* Update total number of PCM PDIs */1322 stream->num_pdi = stream->num_bd + stream->num_in + stream->num_out;1323 cdns->num_ports = stream->num_pdi;1324 1325 return 0;1326}1327EXPORT_SYMBOL(sdw_cdns_pdi_init);1328 1329static u32 cdns_set_initial_frame_shape(int n_rows, int n_cols)1330{1331 u32 val;1332 int c;1333 int r;1334 1335 r = sdw_find_row_index(n_rows);1336 c = sdw_find_col_index(n_cols);1337 1338 val = FIELD_PREP(CDNS_MCP_FRAME_SHAPE_ROW_MASK, r);1339 val |= FIELD_PREP(CDNS_MCP_FRAME_SHAPE_COL_MASK, c);1340 1341 return val;1342}1343 1344static void cdns_init_clock_ctrl(struct sdw_cdns *cdns)1345{1346 struct sdw_bus *bus = &cdns->bus;1347 struct sdw_master_prop *prop = &bus->prop;1348 u32 val;1349 u32 ssp_interval;1350 int divider;1351 1352 dev_dbg(cdns->dev, "mclk %d max %d row %d col %d\n",1353 prop->mclk_freq,1354 prop->max_clk_freq,1355 prop->default_row,1356 prop->default_col);1357 1358 /* Set clock divider */1359 divider = (prop->mclk_freq / prop->max_clk_freq) - 1;1360 1361 cdns_updatel(cdns, CDNS_MCP_CLK_CTRL0,1362 CDNS_MCP_CLK_MCLKD_MASK, divider);1363 cdns_updatel(cdns, CDNS_MCP_CLK_CTRL1,1364 CDNS_MCP_CLK_MCLKD_MASK, divider);1365 1366 /*1367 * Frame shape changes after initialization have to be done1368 * with the bank switch mechanism1369 */1370 val = cdns_set_initial_frame_shape(prop->default_row,1371 prop->default_col);1372 cdns_writel(cdns, CDNS_MCP_FRAME_SHAPE_INIT, val);1373 1374 /* Set SSP interval to default value */1375 ssp_interval = prop->default_frame_rate / SDW_CADENCE_GSYNC_HZ;1376 cdns_writel(cdns, CDNS_MCP_SSP_CTRL0, ssp_interval);1377 cdns_writel(cdns, CDNS_MCP_SSP_CTRL1, ssp_interval);1378}1379 1380/**1381 * sdw_cdns_init() - Cadence initialization1382 * @cdns: Cadence instance1383 */1384int sdw_cdns_init(struct sdw_cdns *cdns)1385{1386 u32 val;1387 1388 cdns_init_clock_ctrl(cdns);1389 1390 sdw_cdns_check_self_clearing_bits(cdns, __func__, false, 0);1391 1392 /* reset msg_count to default value of FIFOLEVEL */1393 cdns->msg_count = cdns_readl(cdns, CDNS_MCP_FIFOLEVEL);1394 1395 /* flush command FIFOs */1396 cdns_updatel(cdns, CDNS_MCP_CONTROL, CDNS_MCP_CONTROL_CMD_RST,1397 CDNS_MCP_CONTROL_CMD_RST);1398 1399 /* Set cmd accept mode */1400 cdns_ip_updatel(cdns, CDNS_IP_MCP_CONTROL, CDNS_IP_MCP_CONTROL_CMD_ACCEPT,1401 CDNS_IP_MCP_CONTROL_CMD_ACCEPT);1402 1403 /* Configure mcp config */1404 val = cdns_readl(cdns, CDNS_MCP_CONFIG);1405 1406 /* Disable auto bus release */1407 val &= ~CDNS_MCP_CONFIG_BUS_REL;1408 1409 cdns_writel(cdns, CDNS_MCP_CONFIG, val);1410 1411 /* Configure IP mcp config */1412 val = cdns_ip_readl(cdns, CDNS_IP_MCP_CONFIG);1413 1414 /* enable bus operations with clock and data */1415 val &= ~CDNS_IP_MCP_CONFIG_OP;1416 val |= CDNS_IP_MCP_CONFIG_OP_NORMAL;1417 1418 /* Set cmd mode for Tx and Rx cmds */1419 val &= ~CDNS_IP_MCP_CONFIG_CMD;1420 1421 /* Disable sniffer mode */1422 val &= ~CDNS_IP_MCP_CONFIG_SNIFFER;1423 1424 if (cdns->bus.multi_link)1425 /* Set Multi-master mode to take gsync into account */1426 val |= CDNS_IP_MCP_CONFIG_MMASTER;1427 1428 /* leave frame delay to hardware default of 0x1F */1429 1430 /* leave command retry to hardware default of 0 */1431 1432 cdns_ip_writel(cdns, CDNS_IP_MCP_CONFIG, val);1433 1434 /* changes will be committed later */1435 return 0;1436}1437EXPORT_SYMBOL(sdw_cdns_init);1438 1439int cdns_bus_conf(struct sdw_bus *bus, struct sdw_bus_params *params)1440{1441 struct sdw_master_prop *prop = &bus->prop;1442 struct sdw_cdns *cdns = bus_to_cdns(bus);1443 int mcp_clkctrl_off;1444 int divider;1445 1446 if (!params->curr_dr_freq) {1447 dev_err(cdns->dev, "NULL curr_dr_freq\n");1448 return -EINVAL;1449 }1450 1451 divider = prop->mclk_freq * SDW_DOUBLE_RATE_FACTOR /1452 params->curr_dr_freq;1453 divider--; /* divider is 1/(N+1) */1454 1455 if (params->next_bank)1456 mcp_clkctrl_off = CDNS_MCP_CLK_CTRL1;1457 else1458 mcp_clkctrl_off = CDNS_MCP_CLK_CTRL0;1459 1460 cdns_updatel(cdns, mcp_clkctrl_off, CDNS_MCP_CLK_MCLKD_MASK, divider);1461 1462 return 0;1463}1464EXPORT_SYMBOL(cdns_bus_conf);1465 1466static int cdns_port_params(struct sdw_bus *bus,1467 struct sdw_port_params *p_params, unsigned int bank)1468{1469 struct sdw_cdns *cdns = bus_to_cdns(bus);1470 int dpn_config_off_source;1471 int dpn_config_off_target;1472 int target_num = p_params->num;1473 int source_num = p_params->num;1474 bool override = false;1475 int dpn_config;1476 1477 if (target_num == cdns->pdi_loopback_target &&1478 cdns->pdi_loopback_source != -1) {1479 source_num = cdns->pdi_loopback_source;1480 override = true;1481 }1482 1483 if (bank) {1484 dpn_config_off_source = CDNS_DPN_B1_CONFIG(source_num);1485 dpn_config_off_target = CDNS_DPN_B1_CONFIG(target_num);1486 } else {1487 dpn_config_off_source = CDNS_DPN_B0_CONFIG(source_num);1488 dpn_config_off_target = CDNS_DPN_B0_CONFIG(target_num);1489 }1490 1491 dpn_config = cdns_readl(cdns, dpn_config_off_source);1492 1493 /* use port params if there is no loopback, otherwise use source as is */1494 if (!override) {1495 u32p_replace_bits(&dpn_config, p_params->bps - 1, CDNS_DPN_CONFIG_WL);1496 u32p_replace_bits(&dpn_config, p_params->flow_mode, CDNS_DPN_CONFIG_PORT_FLOW);1497 u32p_replace_bits(&dpn_config, p_params->data_mode, CDNS_DPN_CONFIG_PORT_DAT);1498 }1499 1500 cdns_writel(cdns, dpn_config_off_target, dpn_config);1501 1502 return 0;1503}1504 1505static int cdns_transport_params(struct sdw_bus *bus,1506 struct sdw_transport_params *t_params,1507 enum sdw_reg_bank bank)1508{1509 struct sdw_cdns *cdns = bus_to_cdns(bus);1510 int dpn_config;1511 int dpn_config_off_source;1512 int dpn_config_off_target;1513 int dpn_hctrl;1514 int dpn_hctrl_off_source;1515 int dpn_hctrl_off_target;1516 int dpn_offsetctrl;1517 int dpn_offsetctrl_off_source;1518 int dpn_offsetctrl_off_target;1519 int dpn_samplectrl;1520 int dpn_samplectrl_off_source;1521 int dpn_samplectrl_off_target;1522 int source_num = t_params->port_num;1523 int target_num = t_params->port_num;1524 bool override = false;1525 1526 if (target_num == cdns->pdi_loopback_target &&1527 cdns->pdi_loopback_source != -1) {1528 source_num = cdns->pdi_loopback_source;1529 override = true;1530 }1531 1532 /*1533 * Note: Only full data port is supported on the Master side for1534 * both PCM and PDM ports.1535 */1536 1537 if (bank) {1538 dpn_config_off_source = CDNS_DPN_B1_CONFIG(source_num);1539 dpn_hctrl_off_source = CDNS_DPN_B1_HCTRL(source_num);1540 dpn_offsetctrl_off_source = CDNS_DPN_B1_OFFSET_CTRL(source_num);1541 dpn_samplectrl_off_source = CDNS_DPN_B1_SAMPLE_CTRL(source_num);1542 1543 dpn_config_off_target = CDNS_DPN_B1_CONFIG(target_num);1544 dpn_hctrl_off_target = CDNS_DPN_B1_HCTRL(target_num);1545 dpn_offsetctrl_off_target = CDNS_DPN_B1_OFFSET_CTRL(target_num);1546 dpn_samplectrl_off_target = CDNS_DPN_B1_SAMPLE_CTRL(target_num);1547 1548 } else {1549 dpn_config_off_source = CDNS_DPN_B0_CONFIG(source_num);1550 dpn_hctrl_off_source = CDNS_DPN_B0_HCTRL(source_num);1551 dpn_offsetctrl_off_source = CDNS_DPN_B0_OFFSET_CTRL(source_num);1552 dpn_samplectrl_off_source = CDNS_DPN_B0_SAMPLE_CTRL(source_num);1553 1554 dpn_config_off_target = CDNS_DPN_B0_CONFIG(target_num);1555 dpn_hctrl_off_target = CDNS_DPN_B0_HCTRL(target_num);1556 dpn_offsetctrl_off_target = CDNS_DPN_B0_OFFSET_CTRL(target_num);1557 dpn_samplectrl_off_target = CDNS_DPN_B0_SAMPLE_CTRL(target_num);1558 }1559 1560 dpn_config = cdns_readl(cdns, dpn_config_off_source);1561 if (!override) {1562 u32p_replace_bits(&dpn_config, t_params->blk_grp_ctrl, CDNS_DPN_CONFIG_BGC);1563 u32p_replace_bits(&dpn_config, t_params->blk_pkg_mode, CDNS_DPN_CONFIG_BPM);1564 }1565 cdns_writel(cdns, dpn_config_off_target, dpn_config);1566 1567 if (!override) {1568 dpn_offsetctrl = 0;1569 u32p_replace_bits(&dpn_offsetctrl, t_params->offset1, CDNS_DPN_OFFSET_CTRL_1);1570 u32p_replace_bits(&dpn_offsetctrl, t_params->offset2, CDNS_DPN_OFFSET_CTRL_2);1571 } else {1572 dpn_offsetctrl = cdns_readl(cdns, dpn_offsetctrl_off_source);1573 }1574 cdns_writel(cdns, dpn_offsetctrl_off_target, dpn_offsetctrl);1575 1576 if (!override) {1577 dpn_hctrl = 0;1578 u32p_replace_bits(&dpn_hctrl, t_params->hstart, CDNS_DPN_HCTRL_HSTART);1579 u32p_replace_bits(&dpn_hctrl, t_params->hstop, CDNS_DPN_HCTRL_HSTOP);1580 u32p_replace_bits(&dpn_hctrl, t_params->lane_ctrl, CDNS_DPN_HCTRL_LCTRL);1581 } else {1582 dpn_hctrl = cdns_readl(cdns, dpn_hctrl_off_source);1583 }1584 cdns_writel(cdns, dpn_hctrl_off_target, dpn_hctrl);1585 1586 if (!override)1587 dpn_samplectrl = t_params->sample_interval - 1;1588 else1589 dpn_samplectrl = cdns_readl(cdns, dpn_samplectrl_off_source);1590 cdns_writel(cdns, dpn_samplectrl_off_target, dpn_samplectrl);1591 1592 return 0;1593}1594 1595static int cdns_port_enable(struct sdw_bus *bus,1596 struct sdw_enable_ch *enable_ch, unsigned int bank)1597{1598 struct sdw_cdns *cdns = bus_to_cdns(bus);1599 int dpn_chnen_off, ch_mask;1600 1601 if (bank)1602 dpn_chnen_off = CDNS_DPN_B1_CH_EN(enable_ch->port_num);1603 else1604 dpn_chnen_off = CDNS_DPN_B0_CH_EN(enable_ch->port_num);1605 1606 ch_mask = enable_ch->ch_mask * enable_ch->enable;1607 cdns_writel(cdns, dpn_chnen_off, ch_mask);1608 1609 return 0;1610}1611 1612static const struct sdw_master_port_ops cdns_port_ops = {1613 .dpn_set_port_params = cdns_port_params,1614 .dpn_set_port_transport_params = cdns_transport_params,1615 .dpn_port_enable_ch = cdns_port_enable,1616};1617 1618/**1619 * sdw_cdns_is_clock_stop: Check clock status1620 *1621 * @cdns: Cadence instance1622 */1623bool sdw_cdns_is_clock_stop(struct sdw_cdns *cdns)1624{1625 return !!(cdns_readl(cdns, CDNS_MCP_STAT) & CDNS_MCP_STAT_CLK_STOP);1626}1627EXPORT_SYMBOL(sdw_cdns_is_clock_stop);1628 1629/**1630 * sdw_cdns_clock_stop: Cadence clock stop configuration routine1631 *1632 * @cdns: Cadence instance1633 * @block_wake: prevent wakes if required by the platform1634 */1635int sdw_cdns_clock_stop(struct sdw_cdns *cdns, bool block_wake)1636{1637 bool slave_present = false;1638 struct sdw_slave *slave;1639 int ret;1640 1641 sdw_cdns_check_self_clearing_bits(cdns, __func__, false, 0);1642 1643 /* Check suspend status */1644 if (sdw_cdns_is_clock_stop(cdns)) {1645 dev_dbg(cdns->dev, "Clock is already stopped\n");1646 return 0;1647 }1648 1649 /*1650 * Before entering clock stop we mask the Slave1651 * interrupts. This helps avoid having to deal with e.g. a1652 * Slave becoming UNATTACHED while the clock is being stopped1653 */1654 cdns_enable_slave_interrupts(cdns, false);1655 1656 /*1657 * For specific platforms, it is required to be able to put1658 * master into a state in which it ignores wake-up trials1659 * in clock stop state1660 */1661 if (block_wake)1662 cdns_ip_updatel(cdns, CDNS_IP_MCP_CONTROL,1663 CDNS_IP_MCP_CONTROL_BLOCK_WAKEUP,1664 CDNS_IP_MCP_CONTROL_BLOCK_WAKEUP);1665 1666 list_for_each_entry(slave, &cdns->bus.slaves, node) {1667 if (slave->status == SDW_SLAVE_ATTACHED ||1668 slave->status == SDW_SLAVE_ALERT) {1669 slave_present = true;1670 break;1671 }1672 }1673 1674 /* commit changes */1675 ret = cdns_config_update(cdns);1676 if (ret < 0) {1677 dev_err(cdns->dev, "%s: config_update failed\n", __func__);1678 return ret;1679 }1680 1681 /* Prepare slaves for clock stop */1682 if (slave_present) {1683 ret = sdw_bus_prep_clk_stop(&cdns->bus);1684 if (ret < 0 && ret != -ENODATA) {1685 dev_err(cdns->dev, "prepare clock stop failed %d\n", ret);1686 return ret;1687 }1688 }1689 1690 /*1691 * Enter clock stop mode and only report errors if there are1692 * Slave devices present (ALERT or ATTACHED)1693 */1694 ret = sdw_bus_clk_stop(&cdns->bus);1695 if (ret < 0 && slave_present && ret != -ENODATA) {1696 dev_err(cdns->dev, "bus clock stop failed %d\n", ret);1697 return ret;1698 }1699 1700 ret = cdns_set_wait(cdns, CDNS_MCP_STAT,1701 CDNS_MCP_STAT_CLK_STOP,1702 CDNS_MCP_STAT_CLK_STOP);1703 if (ret < 0)1704 dev_err(cdns->dev, "Clock stop failed %d\n", ret);1705 1706 return ret;1707}1708EXPORT_SYMBOL(sdw_cdns_clock_stop);1709 1710/**1711 * sdw_cdns_clock_restart: Cadence PM clock restart configuration routine1712 *1713 * @cdns: Cadence instance1714 * @bus_reset: context may be lost while in low power modes and the bus1715 * may require a Severe Reset and re-enumeration after a wake.1716 */1717int sdw_cdns_clock_restart(struct sdw_cdns *cdns, bool bus_reset)1718{1719 int ret;1720 1721 /* unmask Slave interrupts that were masked when stopping the clock */1722 cdns_enable_slave_interrupts(cdns, true);1723 1724 ret = cdns_clear_bit(cdns, CDNS_MCP_CONTROL,1725 CDNS_MCP_CONTROL_CLK_STOP_CLR);1726 if (ret < 0) {1727 dev_err(cdns->dev, "Couldn't exit from clock stop\n");1728 return ret;1729 }1730 1731 ret = cdns_set_wait(cdns, CDNS_MCP_STAT, CDNS_MCP_STAT_CLK_STOP, 0);1732 if (ret < 0) {1733 dev_err(cdns->dev, "clock stop exit failed %d\n", ret);1734 return ret;1735 }1736 1737 cdns_ip_updatel(cdns, CDNS_IP_MCP_CONTROL,1738 CDNS_IP_MCP_CONTROL_BLOCK_WAKEUP, 0);1739 1740 cdns_ip_updatel(cdns, CDNS_IP_MCP_CONTROL, CDNS_IP_MCP_CONTROL_CMD_ACCEPT,1741 CDNS_IP_MCP_CONTROL_CMD_ACCEPT);1742 1743 if (!bus_reset) {1744 1745 /* enable bus operations with clock and data */1746 cdns_ip_updatel(cdns, CDNS_IP_MCP_CONFIG,1747 CDNS_IP_MCP_CONFIG_OP,1748 CDNS_IP_MCP_CONFIG_OP_NORMAL);1749 1750 ret = cdns_config_update(cdns);1751 if (ret < 0) {1752 dev_err(cdns->dev, "%s: config_update failed\n", __func__);1753 return ret;1754 }1755 1756 ret = sdw_bus_exit_clk_stop(&cdns->bus);1757 if (ret < 0)1758 dev_err(cdns->dev, "bus failed to exit clock stop %d\n", ret);1759 }1760 1761 return ret;1762}1763EXPORT_SYMBOL(sdw_cdns_clock_restart);1764 1765/**1766 * sdw_cdns_probe() - Cadence probe routine1767 * @cdns: Cadence instance1768 */1769int sdw_cdns_probe(struct sdw_cdns *cdns)1770{1771 init_completion(&cdns->tx_complete);1772 cdns->bus.port_ops = &cdns_port_ops;1773 1774 mutex_init(&cdns->status_update_lock);1775 1776 INIT_WORK(&cdns->work, cdns_update_slave_status_work);1777 INIT_DELAYED_WORK(&cdns->attach_dwork, cdns_check_attached_status_dwork);1778 1779 return 0;1780}1781EXPORT_SYMBOL(sdw_cdns_probe);1782 1783int cdns_set_sdw_stream(struct snd_soc_dai *dai,1784 void *stream, int direction)1785{1786 struct sdw_cdns *cdns = snd_soc_dai_get_drvdata(dai);1787 struct sdw_cdns_dai_runtime *dai_runtime;1788 1789 dai_runtime = cdns->dai_runtime_array[dai->id];1790 1791 if (stream) {1792 /* first paranoia check */1793 if (dai_runtime) {1794 dev_err(dai->dev,1795 "dai_runtime already allocated for dai %s\n",1796 dai->name);1797 return -EINVAL;1798 }1799 1800 /* allocate and set dai_runtime info */1801 dai_runtime = kzalloc(sizeof(*dai_runtime), GFP_KERNEL);1802 if (!dai_runtime)1803 return -ENOMEM;1804 1805 dai_runtime->stream_type = SDW_STREAM_PCM;1806 1807 dai_runtime->bus = &cdns->bus;1808 dai_runtime->link_id = cdns->instance;1809 1810 dai_runtime->stream = stream;1811 dai_runtime->direction = direction;1812 1813 cdns->dai_runtime_array[dai->id] = dai_runtime;1814 } else {1815 /* second paranoia check */1816 if (!dai_runtime) {1817 dev_err(dai->dev,1818 "dai_runtime not allocated for dai %s\n",1819 dai->name);1820 return -EINVAL;1821 }1822 1823 /* for NULL stream we release allocated dai_runtime */1824 kfree(dai_runtime);1825 cdns->dai_runtime_array[dai->id] = NULL;1826 }1827 return 0;1828}1829EXPORT_SYMBOL(cdns_set_sdw_stream);1830 1831/**1832 * cdns_find_pdi() - Find a free PDI1833 *1834 * @cdns: Cadence instance1835 * @num: Number of PDIs1836 * @pdi: PDI instances1837 * @dai_id: DAI id1838 *1839 * Find a PDI for a given PDI array. The PDI num and dai_id are1840 * expected to match, return NULL otherwise.1841 */1842static struct sdw_cdns_pdi *cdns_find_pdi(struct sdw_cdns *cdns,1843 unsigned int num,1844 struct sdw_cdns_pdi *pdi,1845 int dai_id)1846{1847 int i;1848 1849 for (i = 0; i < num; i++)1850 if (pdi[i].num == dai_id)1851 return &pdi[i];1852 1853 return NULL;1854}1855 1856/**1857 * sdw_cdns_config_stream: Configure a stream1858 *1859 * @cdns: Cadence instance1860 * @ch: Channel count1861 * @dir: Data direction1862 * @pdi: PDI to be used1863 */1864void sdw_cdns_config_stream(struct sdw_cdns *cdns,1865 u32 ch, u32 dir, struct sdw_cdns_pdi *pdi)1866{1867 u32 offset, val = 0;1868 1869 if (dir == SDW_DATA_DIR_RX) {1870 val = CDNS_PORTCTRL_DIRN;1871 1872 if (cdns->bus.params.m_data_mode != SDW_PORT_DATA_MODE_NORMAL)1873 val |= CDNS_PORTCTRL_TEST_FAILED;1874 }1875 offset = CDNS_PORTCTRL + pdi->num * CDNS_PORT_OFFSET;1876 cdns_updatel(cdns, offset,1877 CDNS_PORTCTRL_DIRN | CDNS_PORTCTRL_TEST_FAILED,1878 val);1879 1880 val = pdi->num;1881 val |= CDNS_PDI_CONFIG_SOFT_RESET;1882 val |= FIELD_PREP(CDNS_PDI_CONFIG_CHANNEL, (1 << ch) - 1);1883 cdns_writel(cdns, CDNS_PDI_CONFIG(pdi->num), val);1884}1885EXPORT_SYMBOL(sdw_cdns_config_stream);1886 1887/**1888 * sdw_cdns_alloc_pdi() - Allocate a PDI1889 *1890 * @cdns: Cadence instance1891 * @stream: Stream to be allocated1892 * @ch: Channel count1893 * @dir: Data direction1894 * @dai_id: DAI id1895 */1896struct sdw_cdns_pdi *sdw_cdns_alloc_pdi(struct sdw_cdns *cdns,1897 struct sdw_cdns_streams *stream,1898 u32 ch, u32 dir, int dai_id)1899{1900 struct sdw_cdns_pdi *pdi = NULL;1901 1902 if (dir == SDW_DATA_DIR_RX)1903 pdi = cdns_find_pdi(cdns, stream->num_in, stream->in,1904 dai_id);1905 else1906 pdi = cdns_find_pdi(cdns, stream->num_out, stream->out,1907 dai_id);1908 1909 /* check if we found a PDI, else find in bi-directional */1910 if (!pdi)1911 pdi = cdns_find_pdi(cdns, stream->num_bd, stream->bd,1912 dai_id);1913 1914 if (pdi) {1915 pdi->l_ch_num = 0;1916 pdi->h_ch_num = ch - 1;1917 pdi->dir = dir;1918 pdi->ch_count = ch;1919 }1920 1921 return pdi;1922}1923EXPORT_SYMBOL(sdw_cdns_alloc_pdi);1924 1925MODULE_LICENSE("Dual BSD/GPL");1926MODULE_DESCRIPTION("Cadence Soundwire Library");1927