linux/drivers/soundwire/cadence_master.c
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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 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
  25static int interrupt_mask;
  26module_param_named(cnds_mcp_int_mask, interrupt_mask, int, 0444);
  27MODULE_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 */
 198static inline u32 cdns_readl(struct sdw_cdns *cdns, int offset)
 199{
 200        return readl(cdns->registers + offset);
 201}
 202
 203static inline void cdns_writel(struct sdw_cdns *cdns, int offset, u32 value)
 204{
 205        writel(value, cdns->registers + offset);
 206}
 207
 208static 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
 218static 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
 236static 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 */
 248static 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
 272static 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
 279static 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}
 352DEFINE_SHOW_ATTRIBUTE(cdns_reg);
 353
 354static 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
 372DEFINE_DEBUGFS_ATTRIBUTE(cdns_hw_reset_fops, NULL, cdns_hw_reset, "%llu\n");
 373
 374static 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
 450DEFINE_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 */
 458void 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}
 468EXPORT_SYMBOL_GPL(sdw_cdns_debugfs_init);
 469
 470#endif /* CONFIG_DEBUG_FS */
 471
 472/*
 473 * IO Calls
 474 */
 475static enum sdw_command_response
 476cdns_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
 511static 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
 558static enum sdw_command_response
 559cdns_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
 623static 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
 652enum sdw_command_response
 653cdns_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
 675exit:
 676        return ret;
 677}
 678EXPORT_SYMBOL(cdns_xfer_msg);
 679
 680enum sdw_command_response
 681cdns_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}
 700EXPORT_SYMBOL(cdns_xfer_msg_defer);
 701
 702enum sdw_command_response
 703cdns_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}
 714EXPORT_SYMBOL(cdns_reset_page_addr);
 715
 716/*
 717 * IRQ handling
 718 */
 719
 720static 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
 736static 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 */
 821irqreturn_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}
 905EXPORT_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 */
 913static 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 */
 947int 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}
 968EXPORT_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 */
 975static 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 */
 993int 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
1028update_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}
1058EXPORT_SYMBOL(sdw_cdns_enable_interrupt);
1059
1060static 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 */
1088int 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}
1159EXPORT_SYMBOL(sdw_cdns_pdi_init);
1160
1161static 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
1176static 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 */
1210int 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}
1256EXPORT_SYMBOL(sdw_cdns_init);
1257
1258int 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}
1283EXPORT_SYMBOL(cdns_bus_conf);
1284
1285static 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
1307static 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
1354static 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
1371static 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 */
1382bool sdw_cdns_is_clock_stop(struct sdw_cdns *cdns)
1383{
1384        return !!(cdns_readl(cdns, CDNS_MCP_STAT) & CDNS_MCP_STAT_CLK_STOP);
1385}
1386EXPORT_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 */
1394int 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}
1479EXPORT_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 */
1488int 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}
1537EXPORT_SYMBOL(sdw_cdns_clock_restart);
1538
1539/**
1540 * sdw_cdns_probe() - Cadence probe routine
1541 * @cdns: Cadence instance
1542 */
1543int 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}
1551EXPORT_SYMBOL(sdw_cdns_probe);
1552
1553int 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}
1604EXPORT_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 */
1618static 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 */
1641void 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}
1662EXPORT_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 */
1673struct 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}
1700EXPORT_SYMBOL(sdw_cdns_alloc_pdi);
1701
1702MODULE_LICENSE("Dual BSD/GPL");
1703MODULE_DESCRIPTION("Cadence Soundwire Library");
1704