intel.c

   1 // SPDX-License-Identifier: (GPL-2.0 OR BSD-3-Clause)
   2 // Copyright(c) 2015-17 Intel Corporation.
   3
   4 /*
   5  * Soundwire Intel Master Driver
   6  */
   7
   8 #include <linux/acpi.h>
   9 #include <linux/debugfs.h>
  10 #include <linux/delay.h>
  11 #include <linux/module.h>
  12 #include <linux/interrupt.h>
  13 #include <linux/io.h>
  14 #include <linux/platform_device.h>
  15 #include <sound/pcm_params.h>
  16 #include <linux/pm_runtime.h>
  17 #include <sound/soc.h>
  18 #include <linux/soundwire/sdw_registers.h>
  19 #include <linux/soundwire/sdw.h>
  20 #include <linux/soundwire/sdw_intel.h>
  21 #include "cadence_master.h"
  22 #include "bus.h"
  23 #include "intel.h"
  24
  25 #define INTEL_MASTER_SUSPEND_DELAY_MS   3000
  26
  27 /*
  28  * debug/config flags for the Intel SoundWire Master.
  29  *
  30  * Since we may have multiple masters active, we can have up to 8
  31  * flags reused in each byte, with master0 using the ls-byte, etc.
  32  */
  33
  34 #define SDW_INTEL_MASTER_DISABLE_PM_RUNTIME             BIT(0)
  35 #define SDW_INTEL_MASTER_DISABLE_CLOCK_STOP             BIT(1)
  36 #define SDW_INTEL_MASTER_DISABLE_PM_RUNTIME_IDLE        BIT(2)
  37 #define SDW_INTEL_MASTER_DISABLE_MULTI_LINK             BIT(3)
  38
  39 static int md_flags;
  40 module_param_named(sdw_md_flags, md_flags, int, 0444);
  41 MODULE_PARM_DESC(sdw_md_flags, "SoundWire Intel Master device flags (0x0 all off)");
  42
  43 /* Intel SHIM Registers Definition */
  44 #define SDW_SHIM_LCAP                   0x0
  45 #define SDW_SHIM_LCTL                   0x4
  46 #define SDW_SHIM_IPPTR                  0x8
  47 #define SDW_SHIM_SYNC                   0xC
  48
  49 #define SDW_SHIM_CTLSCAP(x)             (0x010 + 0x60 * (x))
  50 #define SDW_SHIM_CTLS0CM(x)             (0x012 + 0x60 * (x))
  51 #define SDW_SHIM_CTLS1CM(x)             (0x014 + 0x60 * (x))
  52 #define SDW_SHIM_CTLS2CM(x)             (0x016 + 0x60 * (x))
  53 #define SDW_SHIM_CTLS3CM(x)             (0x018 + 0x60 * (x))
  54 #define SDW_SHIM_PCMSCAP(x)             (0x020 + 0x60 * (x))
  55
  56 #define SDW_SHIM_PCMSYCHM(x, y)         (0x022 + (0x60 * (x)) + (0x2 * (y)))
  57 #define SDW_SHIM_PCMSYCHC(x, y)         (0x042 + (0x60 * (x)) + (0x2 * (y)))
  58 #define SDW_SHIM_PDMSCAP(x)             (0x062 + 0x60 * (x))
  59 #define SDW_SHIM_IOCTL(x)               (0x06C + 0x60 * (x))
  60 #define SDW_SHIM_CTMCTL(x)              (0x06E + 0x60 * (x))
  61
  62 #define SDW_SHIM_WAKEEN                 0x190
  63 #define SDW_SHIM_WAKESTS                0x192
  64
  65 #define SDW_SHIM_LCTL_SPA               BIT(0)
  66 #define SDW_SHIM_LCTL_SPA_MASK          GENMASK(3, 0)
  67 #define SDW_SHIM_LCTL_CPA               BIT(8)
  68 #define SDW_SHIM_LCTL_CPA_MASK          GENMASK(11, 8)
  69
  70 #define SDW_SHIM_SYNC_SYNCPRD_VAL_24    (24000 / SDW_CADENCE_GSYNC_KHZ - 1)
  71 #define SDW_SHIM_SYNC_SYNCPRD_VAL_38_4  (38400 / SDW_CADENCE_GSYNC_KHZ - 1)
  72 #define SDW_SHIM_SYNC_SYNCPRD           GENMASK(14, 0)
  73 #define SDW_SHIM_SYNC_SYNCCPU           BIT(15)
  74 #define SDW_SHIM_SYNC_CMDSYNC_MASK      GENMASK(19, 16)
  75 #define SDW_SHIM_SYNC_CMDSYNC           BIT(16)
  76 #define SDW_SHIM_SYNC_SYNCGO            BIT(24)
  77
  78 #define SDW_SHIM_PCMSCAP_ISS            GENMASK(3, 0)
  79 #define SDW_SHIM_PCMSCAP_OSS            GENMASK(7, 4)
  80 #define SDW_SHIM_PCMSCAP_BSS            GENMASK(12, 8)
  81
  82 #define SDW_SHIM_PCMSYCM_LCHN           GENMASK(3, 0)
  83 #define SDW_SHIM_PCMSYCM_HCHN           GENMASK(7, 4)
  84 #define SDW_SHIM_PCMSYCM_STREAM         GENMASK(13, 8)
  85 #define SDW_SHIM_PCMSYCM_DIR            BIT(15)
  86
  87 #define SDW_SHIM_PDMSCAP_ISS            GENMASK(3, 0)
  88 #define SDW_SHIM_PDMSCAP_OSS            GENMASK(7, 4)
  89 #define SDW_SHIM_PDMSCAP_BSS            GENMASK(12, 8)
  90 #define SDW_SHIM_PDMSCAP_CPSS           GENMASK(15, 13)
  91
  92 #define SDW_SHIM_IOCTL_MIF              BIT(0)
  93 #define SDW_SHIM_IOCTL_CO               BIT(1)
  94 #define SDW_SHIM_IOCTL_COE              BIT(2)
  95 #define SDW_SHIM_IOCTL_DO               BIT(3)
  96 #define SDW_SHIM_IOCTL_DOE              BIT(4)
  97 #define SDW_SHIM_IOCTL_BKE              BIT(5)
  98 #define SDW_SHIM_IOCTL_WPDD             BIT(6)
  99 #define SDW_SHIM_IOCTL_CIBD             BIT(8)
 100 #define SDW_SHIM_IOCTL_DIBD             BIT(9)
 101
 102 #define SDW_SHIM_CTMCTL_DACTQE          BIT(0)
 103 #define SDW_SHIM_CTMCTL_DODS            BIT(1)
 104 #define SDW_SHIM_CTMCTL_DOAIS           GENMASK(4, 3)
 105
 106 #define SDW_SHIM_WAKEEN_ENABLE          BIT(0)
 107 #define SDW_SHIM_WAKESTS_STATUS         BIT(0)
 108
 109 /* Intel ALH Register definitions */
 110 #define SDW_ALH_STRMZCFG(x)             (0x000 + (0x4 * (x)))
 111 #define SDW_ALH_NUM_STREAMS             64
 112
 113 #define SDW_ALH_STRMZCFG_DMAT_VAL       0x3
 114 #define SDW_ALH_STRMZCFG_DMAT           GENMASK(7, 0)
 115 #define SDW_ALH_STRMZCFG_CHN            GENMASK(19, 16)
 116
 117 enum intel_pdi_type {
 118         INTEL_PDI_IN = 0,
 119         INTEL_PDI_OUT = 1,
 120         INTEL_PDI_BD = 2,
 121 };
 122
 123 #define cdns_to_intel(_cdns) container_of(_cdns, struct sdw_intel, cdns)
 124
 125 /*
 126  * Read, write helpers for HW registers
 127  */
 128 static inline int intel_readl(void __iomem *base, int offset)
 129 {
 130         return readl(base + offset);
 131 }
 132
 133 static inline void intel_writel(void __iomem *base, int offset, int value)
 134 {
 135         writel(value, base + offset);
 136 }
 137
 138 static inline u16 intel_readw(void __iomem *base, int offset)
 139 {
 140         return readw(base + offset);
 141 }
 142
 143 static inline void intel_writew(void __iomem *base, int offset, u16 value)
 144 {
 145         writew(value, base + offset);
 146 }
 147
 148 static int intel_wait_bit(void __iomem *base, int offset, u32 mask, u32 target)
 149 {
 150         int timeout = 10;
 151         u32 reg_read;
 152
 153         do {
 154                 reg_read = readl(base + offset);
 155                 if ((reg_read & mask) == target)
 156                         return 0;
 157
 158                 timeout--;
 159                 usleep_range(50, 100);
 160         } while (timeout != 0);
 161
 162         return -EAGAIN;
 163 }
 164
 165 static int intel_clear_bit(void __iomem *base, int offset, u32 value, u32 mask)
 166 {
 167         writel(value, base + offset);
 168         return intel_wait_bit(base, offset, mask, 0);
 169 }
 170
 171 static int intel_set_bit(void __iomem *base, int offset, u32 value, u32 mask)
 172 {
 173         writel(value, base + offset);
 174         return intel_wait_bit(base, offset, mask, mask);
 175 }
 176
 177 /*
 178  * debugfs
 179  */
 180 #ifdef CONFIG_DEBUG_FS
 181
 182 #define RD_BUF (2 * PAGE_SIZE)
 183
 184 static ssize_t intel_sprintf(void __iomem *mem, bool l,
 185                              char *buf, size_t pos, unsigned int reg)
 186 {
 187         int value;
 188
 189         if (l)
 190                 value = intel_readl(mem, reg);
 191         else
 192                 value = intel_readw(mem, reg);
 193
 194         return scnprintf(buf + pos, RD_BUF - pos, "%4x\t%4x\n", reg, value);
 195 }
 196
 197 static int intel_reg_show(struct seq_file *s_file, void *data)
 198 {
 199         struct sdw_intel *sdw = s_file->private;
 200         void __iomem *s = sdw->link_res->shim;
 201         void __iomem *a = sdw->link_res->alh;
 202         char *buf;
 203         ssize_t ret;
 204         int i, j;
 205         unsigned int links, reg;
 206
 207         buf = kzalloc(RD_BUF, GFP_KERNEL);
 208         if (!buf)
 209                 return -ENOMEM;
 210
 211         links = intel_readl(s, SDW_SHIM_LCAP) & GENMASK(2, 0);
 212
 213         ret = scnprintf(buf, RD_BUF, "Register  Value\n");
 214         ret += scnprintf(buf + ret, RD_BUF - ret, "\nShim\n");
 215
 216         for (i = 0; i < links; i++) {
 217                 reg = SDW_SHIM_LCAP + i * 4;
 218                 ret += intel_sprintf(s, true, buf, ret, reg);
 219         }
 220
 221         for (i = 0; i < links; i++) {
 222                 ret += scnprintf(buf + ret, RD_BUF - ret, "\nLink%d\n", i);
 223                 ret += intel_sprintf(s, false, buf, ret, SDW_SHIM_CTLSCAP(i));
 224                 ret += intel_sprintf(s, false, buf, ret, SDW_SHIM_CTLS0CM(i));
 225                 ret += intel_sprintf(s, false, buf, ret, SDW_SHIM_CTLS1CM(i));
 226                 ret += intel_sprintf(s, false, buf, ret, SDW_SHIM_CTLS2CM(i));
 227                 ret += intel_sprintf(s, false, buf, ret, SDW_SHIM_CTLS3CM(i));
 228                 ret += intel_sprintf(s, false, buf, ret, SDW_SHIM_PCMSCAP(i));
 229
 230                 ret += scnprintf(buf + ret, RD_BUF - ret, "\n PCMSyCH registers\n");
 231
 232                 /*
 233                  * the value 10 is the number of PDIs. We will need a
 234                  * cleanup to remove hard-coded Intel configurations
 235                  * from cadence_master.c
 236                  */
 237                 for (j = 0; j < 10; j++) {
 238                         ret += intel_sprintf(s, false, buf, ret,
 239                                         SDW_SHIM_PCMSYCHM(i, j));
 240                         ret += intel_sprintf(s, false, buf, ret,
 241                                         SDW_SHIM_PCMSYCHC(i, j));
 242                 }
 243                 ret += scnprintf(buf + ret, RD_BUF - ret, "\n PDMSCAP, IOCTL, CTMCTL\n");
 244
 245                 ret += intel_sprintf(s, false, buf, ret, SDW_SHIM_PDMSCAP(i));
 246                 ret += intel_sprintf(s, false, buf, ret, SDW_SHIM_IOCTL(i));
 247                 ret += intel_sprintf(s, false, buf, ret, SDW_SHIM_CTMCTL(i));
 248         }
 249
 250         ret += scnprintf(buf + ret, RD_BUF - ret, "\nWake registers\n");
 251         ret += intel_sprintf(s, false, buf, ret, SDW_SHIM_WAKEEN);
 252         ret += intel_sprintf(s, false, buf, ret, SDW_SHIM_WAKESTS);
 253
 254         ret += scnprintf(buf + ret, RD_BUF - ret, "\nALH STRMzCFG\n");
 255         for (i = 0; i < SDW_ALH_NUM_STREAMS; i++)
 256                 ret += intel_sprintf(a, true, buf, ret, SDW_ALH_STRMZCFG(i));
 257
 258         seq_printf(s_file, "%s", buf);
 259         kfree(buf);
 260
 261         return 0;
 262 }
 263 DEFINE_SHOW_ATTRIBUTE(intel_reg);
 264
 265 static int intel_set_m_datamode(void *data, u64 value)
 266 {
 267         struct sdw_intel *sdw = data;
 268         struct sdw_bus *bus = &sdw->cdns.bus;
 269
 270         if (value > SDW_PORT_DATA_MODE_STATIC_1)
 271                 return -EINVAL;
 272
 273         /* Userspace changed the hardware state behind the kernel's back */
 274         add_taint(TAINT_USER, LOCKDEP_STILL_OK);
 275
 276         bus->params.m_data_mode = value;
 277
 278         return 0;
 279 }
 280 DEFINE_DEBUGFS_ATTRIBUTE(intel_set_m_datamode_fops, NULL,
 281                          intel_set_m_datamode, "%llu\n");
 282
 283 static int intel_set_s_datamode(void *data, u64 value)
 284 {
 285         struct sdw_intel *sdw = data;
 286         struct sdw_bus *bus = &sdw->cdns.bus;
 287
 288         if (value > SDW_PORT_DATA_MODE_STATIC_1)
 289                 return -EINVAL;
 290
 291         /* Userspace changed the hardware state behind the kernel's back */
 292         add_taint(TAINT_USER, LOCKDEP_STILL_OK);
 293
 294         bus->params.s_data_mode = value;
 295
 296         return 0;
 297 }
 298 DEFINE_DEBUGFS_ATTRIBUTE(intel_set_s_datamode_fops, NULL,
 299                          intel_set_s_datamode, "%llu\n");
 300
 301 static void intel_debugfs_init(struct sdw_intel *sdw)
 302 {
 303         struct dentry *root = sdw->cdns.bus.debugfs;
 304
 305         if (!root)
 306                 return;
 307
 308         sdw->debugfs = debugfs_create_dir("intel-sdw", root);
 309
 310         debugfs_create_file("intel-registers", 0400, sdw->debugfs, sdw,
 311                             &intel_reg_fops);
 312
 313         debugfs_create_file("intel-m-datamode", 0200, sdw->debugfs, sdw,
 314                             &intel_set_m_datamode_fops);
 315
 316         debugfs_create_file("intel-s-datamode", 0200, sdw->debugfs, sdw,
 317                             &intel_set_s_datamode_fops);
 318
 319         sdw_cdns_debugfs_init(&sdw->cdns, sdw->debugfs);
 320 }
 321
 322 static void intel_debugfs_exit(struct sdw_intel *sdw)
 323 {
 324         debugfs_remove_recursive(sdw->debugfs);
 325 }
 326 #else
 327 static void intel_debugfs_init(struct sdw_intel *sdw) {}
 328 static void intel_debugfs_exit(struct sdw_intel *sdw) {}
 329 #endif /* CONFIG_DEBUG_FS */
 330
 331 /*
 332  * shim ops
 333  */
 334
 335 static int intel_link_power_up(struct sdw_intel *sdw)
 336 {
 337         unsigned int link_id = sdw->instance;
 338         void __iomem *shim = sdw->link_res->shim;
 339         u32 *shim_mask = sdw->link_res->shim_mask;
 340         struct sdw_bus *bus = &sdw->cdns.bus;
 341         struct sdw_master_prop *prop = &bus->prop;
 342         u32 spa_mask, cpa_mask;
 343         u32 link_control;
 344         int ret = 0;
 345         u32 syncprd;
 346         u32 sync_reg;
 347
 348         mutex_lock(sdw->link_res->shim_lock);
 349
 350         /*
 351          * The hardware relies on an internal counter, typically 4kHz,
 352          * to generate the SoundWire SSP - which defines a 'safe'
 353          * synchronization point between commands and audio transport
 354          * and allows for multi link synchronization. The SYNCPRD value
 355          * is only dependent on the oscillator clock provided to
 356          * the IP, so adjust based on _DSD properties reported in DSDT
 357          * tables. The values reported are based on either 24MHz
 358          * (CNL/CML) or 38.4 MHz (ICL/TGL+).
 359          */
 360         if (prop->mclk_freq % 6000000)
 361                 syncprd = SDW_SHIM_SYNC_SYNCPRD_VAL_38_4;
 362         else
 363                 syncprd = SDW_SHIM_SYNC_SYNCPRD_VAL_24;
 364
 365         if (!*shim_mask) {
 366                 dev_dbg(sdw->cdns.dev, "%s: powering up all links\n", __func__);
 367
 368                 /* we first need to program the SyncPRD/CPU registers */
 369                 dev_dbg(sdw->cdns.dev,
 370                         "%s: first link up, programming SYNCPRD\n", __func__);
 371
 372                 /* set SyncPRD period */
 373                 sync_reg = intel_readl(shim, SDW_SHIM_SYNC);
 374                 u32p_replace_bits(&sync_reg, syncprd, SDW_SHIM_SYNC_SYNCPRD);
 375
 376                 /* Set SyncCPU bit */
 377                 sync_reg |= SDW_SHIM_SYNC_SYNCCPU;
 378                 intel_writel(shim, SDW_SHIM_SYNC, sync_reg);
 379
 380                 /* Link power up sequence */
 381                 link_control = intel_readl(shim, SDW_SHIM_LCTL);
 382
 383                 /* only power-up enabled links */
 384                 spa_mask = FIELD_PREP(SDW_SHIM_LCTL_SPA_MASK, sdw->link_res->link_mask);
 385                 cpa_mask = FIELD_PREP(SDW_SHIM_LCTL_CPA_MASK, sdw->link_res->link_mask);
 386
 387                 link_control |=  spa_mask;
 388
 389                 ret = intel_set_bit(shim, SDW_SHIM_LCTL, link_control, cpa_mask);
 390                 if (ret < 0) {
 391                         dev_err(sdw->cdns.dev, "Failed to power up link: %d\n", ret);
 392                         goto out;
 393                 }
 394
 395                 /* SyncCPU will change once link is active */
 396                 ret = intel_wait_bit(shim, SDW_SHIM_SYNC,
 397                                      SDW_SHIM_SYNC_SYNCCPU, 0);
 398                 if (ret < 0) {
 399                         dev_err(sdw->cdns.dev,
 400                                 "Failed to set SHIM_SYNC: %d\n", ret);
 401                         goto out;
 402                 }
 403         }
 404
 405         *shim_mask |= BIT(link_id);
 406
 407         sdw->cdns.link_up = true;
 408 out:
 409         mutex_unlock(sdw->link_res->shim_lock);
 410
 411         return ret;
 412 }
 413
 414 /* this needs to be called with shim_lock */
 415 static void intel_shim_glue_to_master_ip(struct sdw_intel *sdw)
 416 {
 417         void __iomem *shim = sdw->link_res->shim;
 418         unsigned int link_id = sdw->instance;
 419         u16 ioctl;
 420
 421         /* Switch to MIP from Glue logic */
 422         ioctl = intel_readw(shim,  SDW_SHIM_IOCTL(link_id));
 423
 424         ioctl &= ~(SDW_SHIM_IOCTL_DOE);
 425         intel_writew(shim, SDW_SHIM_IOCTL(link_id), ioctl);
 426         usleep_range(10, 15);
 427
 428         ioctl &= ~(SDW_SHIM_IOCTL_DO);
 429         intel_writew(shim, SDW_SHIM_IOCTL(link_id), ioctl);
 430         usleep_range(10, 15);
 431
 432         ioctl |= (SDW_SHIM_IOCTL_MIF);
 433         intel_writew(shim, SDW_SHIM_IOCTL(link_id), ioctl);
 434         usleep_range(10, 15);
 435
 436         ioctl &= ~(SDW_SHIM_IOCTL_BKE);
 437         ioctl &= ~(SDW_SHIM_IOCTL_COE);
 438         intel_writew(shim, SDW_SHIM_IOCTL(link_id), ioctl);
 439         usleep_range(10, 15);
 440
 441         /* at this point Master IP has full control of the I/Os */
 442 }
 443
 444 /* this needs to be called with shim_lock */
 445 static void intel_shim_master_ip_to_glue(struct sdw_intel *sdw)
 446 {
 447         unsigned int link_id = sdw->instance;
 448         void __iomem *shim = sdw->link_res->shim;
 449         u16 ioctl;
 450
 451         /* Glue logic */
 452         ioctl = intel_readw(shim, SDW_SHIM_IOCTL(link_id));
 453         ioctl |= SDW_SHIM_IOCTL_BKE;
 454         ioctl |= SDW_SHIM_IOCTL_COE;
 455         intel_writew(shim, SDW_SHIM_IOCTL(link_id), ioctl);
 456         usleep_range(10, 15);
 457
 458         ioctl &= ~(SDW_SHIM_IOCTL_MIF);
 459         intel_writew(shim, SDW_SHIM_IOCTL(link_id), ioctl);
 460         usleep_range(10, 15);
 461
 462         /* at this point Integration Glue has full control of the I/Os */
 463 }
 464
 465 static int intel_shim_init(struct sdw_intel *sdw, bool clock_stop)
 466 {
 467         void __iomem *shim = sdw->link_res->shim;
 468         unsigned int link_id = sdw->instance;
 469         int ret = 0;
 470         u16 ioctl = 0, act = 0;
 471
 472         mutex_lock(sdw->link_res->shim_lock);
 473
 474         /* Initialize Shim */
 475         ioctl |= SDW_SHIM_IOCTL_BKE;
 476         intel_writew(shim, SDW_SHIM_IOCTL(link_id), ioctl);
 477         usleep_range(10, 15);
 478
 479         ioctl |= SDW_SHIM_IOCTL_WPDD;
 480         intel_writew(shim, SDW_SHIM_IOCTL(link_id), ioctl);
 481         usleep_range(10, 15);
 482
 483         ioctl |= SDW_SHIM_IOCTL_DO;
 484         intel_writew(shim, SDW_SHIM_IOCTL(link_id), ioctl);
 485         usleep_range(10, 15);
 486
 487         ioctl |= SDW_SHIM_IOCTL_DOE;
 488         intel_writew(shim, SDW_SHIM_IOCTL(link_id), ioctl);
 489         usleep_range(10, 15);
 490
 491         intel_shim_glue_to_master_ip(sdw);
 492
 493         u16p_replace_bits(&act, 0x1, SDW_SHIM_CTMCTL_DOAIS);
 494         act |= SDW_SHIM_CTMCTL_DACTQE;
 495         act |= SDW_SHIM_CTMCTL_DODS;
 496         intel_writew(shim, SDW_SHIM_CTMCTL(link_id), act);
 497         usleep_range(10, 15);
 498
 499         mutex_unlock(sdw->link_res->shim_lock);
 500
 501         return ret;
 502 }
 503
 504 static void intel_shim_wake(struct sdw_intel *sdw, bool wake_enable)
 505 {
 506         void __iomem *shim = sdw->link_res->shim;
 507         unsigned int link_id = sdw->instance;
 508         u16 wake_en, wake_sts;
 509
 510         mutex_lock(sdw->link_res->shim_lock);
 511         wake_en = intel_readw(shim, SDW_SHIM_WAKEEN);
 512
 513         if (wake_enable) {
 514                 /* Enable the wakeup */
 515                 wake_en |= (SDW_SHIM_WAKEEN_ENABLE << link_id);
 516                 intel_writew(shim, SDW_SHIM_WAKEEN, wake_en);
 517         } else {
 518                 /* Disable the wake up interrupt */
 519                 wake_en &= ~(SDW_SHIM_WAKEEN_ENABLE << link_id);
 520                 intel_writew(shim, SDW_SHIM_WAKEEN, wake_en);
 521
 522                 /* Clear wake status */
 523                 wake_sts = intel_readw(shim, SDW_SHIM_WAKESTS);
 524                 wake_sts |= (SDW_SHIM_WAKESTS_STATUS << link_id);
 525                 intel_writew(shim, SDW_SHIM_WAKESTS, wake_sts);
 526         }
 527         mutex_unlock(sdw->link_res->shim_lock);
 528 }
 529
 530 static int intel_link_power_down(struct sdw_intel *sdw)
 531 {
 532         u32 link_control, spa_mask, cpa_mask;
 533         unsigned int link_id = sdw->instance;
 534         void __iomem *shim = sdw->link_res->shim;
 535         u32 *shim_mask = sdw->link_res->shim_mask;
 536         int ret = 0;
 537
 538         mutex_lock(sdw->link_res->shim_lock);
 539
 540         if (!(*shim_mask & BIT(link_id)))
 541                 dev_err(sdw->cdns.dev,
 542                         "%s: Unbalanced power-up/down calls\n", __func__);
 543
 544         sdw->cdns.link_up = false;
 545
 546         intel_shim_master_ip_to_glue(sdw);
 547
 548         *shim_mask &= ~BIT(link_id);
 549
 550         if (!*shim_mask) {
 551
 552                 dev_dbg(sdw->cdns.dev, "%s: powering down all links\n", __func__);
 553
 554                 /* Link power down sequence */
 555                 link_control = intel_readl(shim, SDW_SHIM_LCTL);
 556
 557                 /* only power-down enabled links */
 558                 spa_mask = FIELD_PREP(SDW_SHIM_LCTL_SPA_MASK, ~sdw->link_res->link_mask);
 559                 cpa_mask = FIELD_PREP(SDW_SHIM_LCTL_CPA_MASK, sdw->link_res->link_mask);
 560
 561                 link_control &=  spa_mask;
 562
 563                 ret = intel_clear_bit(shim, SDW_SHIM_LCTL, link_control, cpa_mask);
 564                 if (ret < 0) {
 565                         dev_err(sdw->cdns.dev, "%s: could not power down link\n", __func__);
 566
 567                         /*
 568                          * we leave the sdw->cdns.link_up flag as false since we've disabled
 569                          * the link at this point and cannot handle interrupts any longer.
 570                          */
 571                 }
 572         }
 573
 574         link_control = intel_readl(shim, SDW_SHIM_LCTL);
 575
 576         mutex_unlock(sdw->link_res->shim_lock);
 577
 578         return ret;
 579 }
 580
 581 static void intel_shim_sync_arm(struct sdw_intel *sdw)
 582 {
 583         void __iomem *shim = sdw->link_res->shim;
 584         u32 sync_reg;
 585
 586         mutex_lock(sdw->link_res->shim_lock);
 587
 588         /* update SYNC register */
 589         sync_reg = intel_readl(shim, SDW_SHIM_SYNC);
 590         sync_reg |= (SDW_SHIM_SYNC_CMDSYNC << sdw->instance);
 591         intel_writel(shim, SDW_SHIM_SYNC, sync_reg);
 592
 593         mutex_unlock(sdw->link_res->shim_lock);
 594 }
 595
 596 static int intel_shim_sync_go_unlocked(struct sdw_intel *sdw)
 597 {
 598         void __iomem *shim = sdw->link_res->shim;
 599         u32 sync_reg;
 600         int ret;
 601
 602         /* Read SYNC register */
 603         sync_reg = intel_readl(shim, SDW_SHIM_SYNC);
 604
 605         /*
 606          * Set SyncGO bit to synchronously trigger a bank switch for
 607          * all the masters. A write to SYNCGO bit clears CMDSYNC bit for all
 608          * the Masters.
 609          */
 610         sync_reg |= SDW_SHIM_SYNC_SYNCGO;
 611
 612         ret = intel_clear_bit(shim, SDW_SHIM_SYNC, sync_reg,
 613                               SDW_SHIM_SYNC_SYNCGO);
 614
 615         if (ret < 0)
 616                 dev_err(sdw->cdns.dev, "SyncGO clear failed: %d\n", ret);
 617
 618         return ret;
 619 }
 620
 621 static int intel_shim_sync_go(struct sdw_intel *sdw)
 622 {
 623         int ret;
 624
 625         mutex_lock(sdw->link_res->shim_lock);
 626
 627         ret = intel_shim_sync_go_unlocked(sdw);
 628
 629         mutex_unlock(sdw->link_res->shim_lock);
 630
 631         return ret;
 632 }
 633
 634 /*
 635  * PDI routines
 636  */
 637 static void intel_pdi_init(struct sdw_intel *sdw,
 638                            struct sdw_cdns_stream_config *config)
 639 {
 640         void __iomem *shim = sdw->link_res->shim;
 641         unsigned int link_id = sdw->instance;
 642         int pcm_cap, pdm_cap;
 643
 644         /* PCM Stream Capability */
 645         pcm_cap = intel_readw(shim, SDW_SHIM_PCMSCAP(link_id));
 646
 647         config->pcm_bd = FIELD_GET(SDW_SHIM_PCMSCAP_BSS, pcm_cap);
 648         config->pcm_in = FIELD_GET(SDW_SHIM_PCMSCAP_ISS, pcm_cap);
 649         config->pcm_out = FIELD_GET(SDW_SHIM_PCMSCAP_OSS, pcm_cap);
 650
 651         dev_dbg(sdw->cdns.dev, "PCM cap bd:%d in:%d out:%d\n",
 652                 config->pcm_bd, config->pcm_in, config->pcm_out);
 653
 654         /* PDM Stream Capability */
 655         pdm_cap = intel_readw(shim, SDW_SHIM_PDMSCAP(link_id));
 656
 657         config->pdm_bd = FIELD_GET(SDW_SHIM_PDMSCAP_BSS, pdm_cap);
 658         config->pdm_in = FIELD_GET(SDW_SHIM_PDMSCAP_ISS, pdm_cap);
 659         config->pdm_out = FIELD_GET(SDW_SHIM_PDMSCAP_OSS, pdm_cap);
 660
 661         dev_dbg(sdw->cdns.dev, "PDM cap bd:%d in:%d out:%d\n",
 662                 config->pdm_bd, config->pdm_in, config->pdm_out);
 663 }
 664
 665 static int
 666 intel_pdi_get_ch_cap(struct sdw_intel *sdw, unsigned int pdi_num, bool pcm)
 667 {
 668         void __iomem *shim = sdw->link_res->shim;
 669         unsigned int link_id = sdw->instance;
 670         int count;
 671
 672         if (pcm) {
 673                 count = intel_readw(shim, SDW_SHIM_PCMSYCHC(link_id, pdi_num));
 674
 675                 /*
 676                  * WORKAROUND: on all existing Intel controllers, pdi
 677                  * number 2 reports channel count as 1 even though it
 678                  * supports 8 channels. Performing hardcoding for pdi
 679                  * number 2.
 680                  */
 681                 if (pdi_num == 2)
 682                         count = 7;
 683
 684         } else {
 685                 count = intel_readw(shim, SDW_SHIM_PDMSCAP(link_id));
 686                 count = FIELD_GET(SDW_SHIM_PDMSCAP_CPSS, count);
 687         }
 688
 689         /* zero based values for channel count in register */
 690         count++;
 691
 692         return count;
 693 }
 694
 695 static int intel_pdi_get_ch_update(struct sdw_intel *sdw,
 696                                    struct sdw_cdns_pdi *pdi,
 697                                    unsigned int num_pdi,
 698                                    unsigned int *num_ch, bool pcm)
 699 {
 700         int i, ch_count = 0;
 701
 702         for (i = 0; i < num_pdi; i++) {
 703                 pdi->ch_count = intel_pdi_get_ch_cap(sdw, pdi->num, pcm);
 704                 ch_count += pdi->ch_count;
 705                 pdi++;
 706         }
 707
 708         *num_ch = ch_count;
 709         return 0;
 710 }
 711
 712 static int intel_pdi_stream_ch_update(struct sdw_intel *sdw,
 713                                       struct sdw_cdns_streams *stream, bool pcm)
 714 {
 715         intel_pdi_get_ch_update(sdw, stream->bd, stream->num_bd,
 716                                 &stream->num_ch_bd, pcm);
 717
 718         intel_pdi_get_ch_update(sdw, stream->in, stream->num_in,
 719                                 &stream->num_ch_in, pcm);
 720
 721         intel_pdi_get_ch_update(sdw, stream->out, stream->num_out,
 722                                 &stream->num_ch_out, pcm);
 723
 724         return 0;
 725 }
 726
 727 static int intel_pdi_ch_update(struct sdw_intel *sdw)
 728 {
 729         /* First update PCM streams followed by PDM streams */
 730         intel_pdi_stream_ch_update(sdw, &sdw->cdns.pcm, true);
 731         intel_pdi_stream_ch_update(sdw, &sdw->cdns.pdm, false);
 732
 733         return 0;
 734 }
 735
 736 static void
 737 intel_pdi_shim_configure(struct sdw_intel *sdw, struct sdw_cdns_pdi *pdi)
 738 {
 739         void __iomem *shim = sdw->link_res->shim;
 740         unsigned int link_id = sdw->instance;
 741         int pdi_conf = 0;
 742
 743         /* the Bulk and PCM streams are not contiguous */
 744         pdi->intel_alh_id = (link_id * 16) + pdi->num + 3;
 745         if (pdi->num >= 2)
 746                 pdi->intel_alh_id += 2;
 747
 748         /*
 749          * Program stream parameters to stream SHIM register
 750          * This is applicable for PCM stream only.
 751          */
 752         if (pdi->type != SDW_STREAM_PCM)
 753                 return;
 754
 755         if (pdi->dir == SDW_DATA_DIR_RX)
 756                 pdi_conf |= SDW_SHIM_PCMSYCM_DIR;
 757         else
 758                 pdi_conf &= ~(SDW_SHIM_PCMSYCM_DIR);
 759
 760         u32p_replace_bits(&pdi_conf, pdi->intel_alh_id, SDW_SHIM_PCMSYCM_STREAM);
 761         u32p_replace_bits(&pdi_conf, pdi->l_ch_num, SDW_SHIM_PCMSYCM_LCHN);
 762         u32p_replace_bits(&pdi_conf, pdi->h_ch_num, SDW_SHIM_PCMSYCM_HCHN);
 763
 764         intel_writew(shim, SDW_SHIM_PCMSYCHM(link_id, pdi->num), pdi_conf);
 765 }
 766
 767 static void
 768 intel_pdi_alh_configure(struct sdw_intel *sdw, struct sdw_cdns_pdi *pdi)
 769 {
 770         void __iomem *alh = sdw->link_res->alh;
 771         unsigned int link_id = sdw->instance;
 772         unsigned int conf;
 773
 774         /* the Bulk and PCM streams are not contiguous */
 775         pdi->intel_alh_id = (link_id * 16) + pdi->num + 3;
 776         if (pdi->num >= 2)
 777                 pdi->intel_alh_id += 2;
 778
 779         /* Program Stream config ALH register */
 780         conf = intel_readl(alh, SDW_ALH_STRMZCFG(pdi->intel_alh_id));
 781
 782         u32p_replace_bits(&conf, SDW_ALH_STRMZCFG_DMAT_VAL, SDW_ALH_STRMZCFG_DMAT);
 783         u32p_replace_bits(&conf, pdi->ch_count - 1, SDW_ALH_STRMZCFG_CHN);
 784
 785         intel_writel(alh, SDW_ALH_STRMZCFG(pdi->intel_alh_id), conf);
 786 }
 787
 788 static int intel_params_stream(struct sdw_intel *sdw,
 789                                struct snd_pcm_substream *substream,
 790                                struct snd_soc_dai *dai,
 791                                struct snd_pcm_hw_params *hw_params,
 792                                int link_id, int alh_stream_id)
 793 {
 794         struct sdw_intel_link_res *res = sdw->link_res;
 795         struct sdw_intel_stream_params_data params_data;
 796
 797         params_data.substream = substream;
 798         params_data.dai = dai;
 799         params_data.hw_params = hw_params;
 800         params_data.link_id = link_id;
 801         params_data.alh_stream_id = alh_stream_id;
 802
 803         if (res->ops && res->ops->params_stream && res->dev)
 804                 return res->ops->params_stream(res->dev,
 805                                                &params_data);
 806         return -EIO;
 807 }
 808
 809 static int intel_free_stream(struct sdw_intel *sdw,
 810                              struct snd_pcm_substream *substream,
 811                              struct snd_soc_dai *dai,
 812                              int link_id)
 813 {
 814         struct sdw_intel_link_res *res = sdw->link_res;
 815         struct sdw_intel_stream_free_data free_data;
 816
 817         free_data.substream = substream;
 818         free_data.dai = dai;
 819         free_data.link_id = link_id;
 820
 821         if (res->ops && res->ops->free_stream && res->dev)
 822                 return res->ops->free_stream(res->dev,
 823                                              &free_data);
 824
 825         return 0;
 826 }
 827
 828 /*
 829  * bank switch routines
 830  */
 831
 832 static int intel_pre_bank_switch(struct sdw_bus *bus)
 833 {
 834         struct sdw_cdns *cdns = bus_to_cdns(bus);
 835         struct sdw_intel *sdw = cdns_to_intel(cdns);
 836
 837         /* Write to register only for multi-link */
 838         if (!bus->multi_link)
 839                 return 0;
 840
 841         intel_shim_sync_arm(sdw);
 842
 843         return 0;
 844 }
 845
 846 static int intel_post_bank_switch(struct sdw_bus *bus)
 847 {
 848         struct sdw_cdns *cdns = bus_to_cdns(bus);
 849         struct sdw_intel *sdw = cdns_to_intel(cdns);
 850         void __iomem *shim = sdw->link_res->shim;
 851         int sync_reg, ret;
 852
 853         /* Write to register only for multi-link */
 854         if (!bus->multi_link)
 855                 return 0;
 856
 857         mutex_lock(sdw->link_res->shim_lock);
 858
 859         /* Read SYNC register */
 860         sync_reg = intel_readl(shim, SDW_SHIM_SYNC);
 861
 862         /*
 863          * post_bank_switch() ops is called from the bus in loop for
 864          * all the Masters in the steam with the expectation that
 865          * we trigger the bankswitch for the only first Master in the list
 866          * and do nothing for the other Masters
 867          *
 868          * So, set the SYNCGO bit only if CMDSYNC bit is set for any Master.
 869          */
 870         if (!(sync_reg & SDW_SHIM_SYNC_CMDSYNC_MASK)) {
 871                 ret = 0;
 872                 goto unlock;
 873         }
 874
 875         ret = intel_shim_sync_go_unlocked(sdw);
 876 unlock:
 877         mutex_unlock(sdw->link_res->shim_lock);
 878
 879         if (ret < 0)
 880                 dev_err(sdw->cdns.dev, "Post bank switch failed: %d\n", ret);
 881
 882         return ret;
 883 }
 884
 885 /*
 886  * DAI routines
 887  */
 888
 889 static int intel_startup(struct snd_pcm_substream *substream,
 890                          struct snd_soc_dai *dai)
 891 {
 892         struct sdw_cdns *cdns = snd_soc_dai_get_drvdata(dai);
 893         int ret;
 894
 895         ret = pm_runtime_get_sync(cdns->dev);
 896         if (ret < 0 && ret != -EACCES) {
 897                 dev_err_ratelimited(cdns->dev,
 898                                     "pm_runtime_get_sync failed in %s, ret %d\n",
 899                                     __func__, ret);
 900                 pm_runtime_put_noidle(cdns->dev);
 901                 return ret;
 902         }
 903         return 0;
 904 }
 905
 906 static int intel_hw_params(struct snd_pcm_substream *substream,
 907                            struct snd_pcm_hw_params *params,
 908                            struct snd_soc_dai *dai)
 909 {
 910         struct sdw_cdns *cdns = snd_soc_dai_get_drvdata(dai);
 911         struct sdw_intel *sdw = cdns_to_intel(cdns);
 912         struct sdw_cdns_dma_data *dma;
 913         struct sdw_cdns_pdi *pdi;
 914         struct sdw_stream_config sconfig;
 915         struct sdw_port_config *pconfig;
 916         int ch, dir;
 917         int ret;
 918         bool pcm = true;
 919
 920         dma = snd_soc_dai_get_dma_data(dai, substream);
 921         if (!dma)
 922                 return -EIO;
 923
 924         ch = params_channels(params);
 925         if (substream->stream == SNDRV_PCM_STREAM_CAPTURE)
 926                 dir = SDW_DATA_DIR_RX;
 927         else
 928                 dir = SDW_DATA_DIR_TX;
 929
 930         if (dma->stream_type == SDW_STREAM_PDM)
 931                 pcm = false;
 932
 933         if (pcm)
 934                 pdi = sdw_cdns_alloc_pdi(cdns, &cdns->pcm, ch, dir, dai->id);
 935         else
 936                 pdi = sdw_cdns_alloc_pdi(cdns, &cdns->pdm, ch, dir, dai->id);
 937
 938         if (!pdi) {
 939                 ret = -EINVAL;
 940                 goto error;
 941         }
 942
 943         /* do run-time configurations for SHIM, ALH and PDI/PORT */
 944         intel_pdi_shim_configure(sdw, pdi);
 945         intel_pdi_alh_configure(sdw, pdi);
 946         sdw_cdns_config_stream(cdns, ch, dir, pdi);
 947
 948         /* store pdi and hw_params, may be needed in prepare step */
 949         dma->suspended = false;
 950         dma->pdi = pdi;
 951         dma->hw_params = params;
 952
 953         /* Inform DSP about PDI stream number */
 954         ret = intel_params_stream(sdw, substream, dai, params,
 955                                   sdw->instance,
 956                                   pdi->intel_alh_id);
 957         if (ret)
 958                 goto error;
 959
 960         sconfig.direction = dir;
 961         sconfig.ch_count = ch;
 962         sconfig.frame_rate = params_rate(params);
 963         sconfig.type = dma->stream_type;
 964
 965         if (dma->stream_type == SDW_STREAM_PDM) {
 966                 sconfig.frame_rate *= 50;
 967                 sconfig.bps = 1;
 968         } else {
 969                 sconfig.bps = snd_pcm_format_width(params_format(params));
 970         }
 971
 972         /* Port configuration */
 973         pconfig = kcalloc(1, sizeof(*pconfig), GFP_KERNEL);
 974         if (!pconfig) {
 975                 ret =  -ENOMEM;
 976                 goto error;
 977         }
 978
 979         pconfig->num = pdi->num;
 980         pconfig->ch_mask = (1 << ch) - 1;
 981
 982         ret = sdw_stream_add_master(&cdns->bus, &sconfig,
 983                                     pconfig, 1, dma->stream);
 984         if (ret)
 985                 dev_err(cdns->dev, "add master to stream failed:%d\n", ret);
 986
 987         kfree(pconfig);
 988 error:
 989         return ret;
 990 }
 991
 992 static int intel_prepare(struct snd_pcm_substream *substream,
 993                          struct snd_soc_dai *dai)
 994 {
 995         struct sdw_cdns *cdns = snd_soc_dai_get_drvdata(dai);
 996         struct sdw_intel *sdw = cdns_to_intel(cdns);
 997         struct sdw_cdns_dma_data *dma;
 998         int ch, dir;
 999         int ret = 0;
1000
1001         dma = snd_soc_dai_get_dma_data(dai, substream);
1002         if (!dma) {
1003                 dev_err(dai->dev, "failed to get dma data in %s",
1004                         __func__);
1005                 return -EIO;
1006         }
1007
1008         if (dma->suspended) {
1009                 dma->suspended = false;
1010
1011                 /*
1012                  * .prepare() is called after system resume, where we
1013                  * need to reinitialize the SHIM/ALH/Cadence IP.
1014                  * .prepare() is also called to deal with underflows,
1015                  * but in those cases we cannot touch ALH/SHIM
1016                  * registers
1017                  */
1018
1019                 /* configure stream */
1020                 ch = params_channels(dma->hw_params);
1021                 if (substream->stream == SNDRV_PCM_STREAM_CAPTURE)
1022                         dir = SDW_DATA_DIR_RX;
1023                 else
1024                         dir = SDW_DATA_DIR_TX;
1025
1026                 intel_pdi_shim_configure(sdw, dma->pdi);
1027                 intel_pdi_alh_configure(sdw, dma->pdi);
1028                 sdw_cdns_config_stream(cdns, ch, dir, dma->pdi);
1029
1030                 /* Inform DSP about PDI stream number */
1031                 ret = intel_params_stream(sdw, substream, dai,
1032                                           dma->hw_params,
1033                                           sdw->instance,
1034                                           dma->pdi->intel_alh_id);
1035         }
1036
1037         return ret;
1038 }
1039
1040 static int
1041 intel_hw_free(struct snd_pcm_substream *substream, struct snd_soc_dai *dai)
1042 {
1043         struct sdw_cdns *cdns = snd_soc_dai_get_drvdata(dai);
1044         struct sdw_intel *sdw = cdns_to_intel(cdns);
1045         struct sdw_cdns_dma_data *dma;
1046         int ret;
1047
1048         dma = snd_soc_dai_get_dma_data(dai, substream);
1049         if (!dma)
1050                 return -EIO;
1051
1052         /*
1053          * The sdw stream state will transition to RELEASED when stream->
1054          * master_list is empty. So the stream state will transition to
1055          * DEPREPARED for the first cpu-dai and to RELEASED for the last
1056          * cpu-dai.
1057          */
1058         ret = sdw_stream_remove_master(&cdns->bus, dma->stream);
1059         if (ret < 0) {
1060                 dev_err(dai->dev, "remove master from stream %s failed: %d\n",
1061                         dma->stream->name, ret);
1062                 return ret;
1063         }
1064
1065         ret = intel_free_stream(sdw, substream, dai, sdw->instance);
1066         if (ret < 0) {
1067                 dev_err(dai->dev, "intel_free_stream: failed %d", ret);
1068                 return ret;
1069         }
1070
1071         dma->hw_params = NULL;
1072         dma->pdi = NULL;
1073
1074         return 0;
1075 }
1076
1077 static void intel_shutdown(struct snd_pcm_substream *substream,
1078                            struct snd_soc_dai *dai)
1079 {
1080         struct sdw_cdns *cdns = snd_soc_dai_get_drvdata(dai);
1081
1082         pm_runtime_mark_last_busy(cdns->dev);
1083         pm_runtime_put_autosuspend(cdns->dev);
1084 }
1085
1086 static int intel_component_dais_suspend(struct snd_soc_component *component)
1087 {
1088         struct sdw_cdns_dma_data *dma;
1089         struct snd_soc_dai *dai;
1090
1091         for_each_component_dais(component, dai) {
1092                 /*
1093                  * we don't have a .suspend dai_ops, and we don't have access
1094                  * to the substream, so let's mark both capture and playback
1095                  * DMA contexts as suspended
1096                  */
1097                 dma = dai->playback_dma_data;
1098                 if (dma)
1099                         dma->suspended = true;
1100
1101                 dma = dai->capture_dma_data;
1102                 if (dma)
1103                         dma->suspended = true;
1104         }
1105
1106         return 0;
1107 }
1108
1109 static int intel_pcm_set_sdw_stream(struct snd_soc_dai *dai,
1110                                     void *stream, int direction)
1111 {
1112         return cdns_set_sdw_stream(dai, stream, true, direction);
1113 }
1114
1115 static int intel_pdm_set_sdw_stream(struct snd_soc_dai *dai,
1116                                     void *stream, int direction)
1117 {
1118         return cdns_set_sdw_stream(dai, stream, false, direction);
1119 }
1120
1121 static void *intel_get_sdw_stream(struct snd_soc_dai *dai,
1122                                   int direction)
1123 {
1124         struct sdw_cdns_dma_data *dma;
1125
1126         if (direction == SNDRV_PCM_STREAM_PLAYBACK)
1127                 dma = dai->playback_dma_data;
1128         else
1129                 dma = dai->capture_dma_data;
1130
1131         if (!dma)
1132                 return ERR_PTR(-EINVAL);
1133
1134         return dma->stream;
1135 }
1136
1137 static const struct snd_soc_dai_ops intel_pcm_dai_ops = {
1138         .startup = intel_startup,
1139         .hw_params = intel_hw_params,
1140         .prepare = intel_prepare,
1141         .hw_free = intel_hw_free,
1142         .shutdown = intel_shutdown,
1143         .set_stream = intel_pcm_set_sdw_stream,
1144         .get_stream = intel_get_sdw_stream,
1145 };
1146
1147 static const struct snd_soc_dai_ops intel_pdm_dai_ops = {
1148         .startup = intel_startup,
1149         .hw_params = intel_hw_params,
1150         .prepare = intel_prepare,
1151         .hw_free = intel_hw_free,
1152         .shutdown = intel_shutdown,
1153         .set_stream = intel_pdm_set_sdw_stream,
1154         .get_stream = intel_get_sdw_stream,
1155 };
1156
1157 static const struct snd_soc_component_driver dai_component = {
1158         .name           = "soundwire",
1159         .suspend        = intel_component_dais_suspend
1160 };
1161
1162 static int intel_create_dai(struct sdw_cdns *cdns,
1163                             struct snd_soc_dai_driver *dais,
1164                             enum intel_pdi_type type,
1165                             u32 num, u32 off, u32 max_ch, bool pcm)
1166 {
1167         int i;
1168
1169         if (num == 0)
1170                 return 0;
1171
1172          /* TODO: Read supported rates/formats from hardware */
1173         for (i = off; i < (off + num); i++) {
1174                 dais[i].name = devm_kasprintf(cdns->dev, GFP_KERNEL,
1175                                               "SDW%d Pin%d",
1176                                               cdns->instance, i);
1177                 if (!dais[i].name)
1178                         return -ENOMEM;
1179
1180                 if (type == INTEL_PDI_BD || type == INTEL_PDI_OUT) {
1181                         dais[i].playback.channels_min = 1;
1182                         dais[i].playback.channels_max = max_ch;
1183                         dais[i].playback.rates = SNDRV_PCM_RATE_48000;
1184                         dais[i].playback.formats = SNDRV_PCM_FMTBIT_S16_LE;
1185                 }
1186
1187                 if (type == INTEL_PDI_BD || type == INTEL_PDI_IN) {
1188                         dais[i].capture.channels_min = 1;
1189                         dais[i].capture.channels_max = max_ch;
1190                         dais[i].capture.rates = SNDRV_PCM_RATE_48000;
1191                         dais[i].capture.formats = SNDRV_PCM_FMTBIT_S16_LE;
1192                 }
1193
1194                 if (pcm)
1195                         dais[i].ops = &intel_pcm_dai_ops;
1196                 else
1197                         dais[i].ops = &intel_pdm_dai_ops;
1198         }
1199
1200         return 0;
1201 }
1202
1203 static int intel_register_dai(struct sdw_intel *sdw)
1204 {
1205         struct sdw_cdns *cdns = &sdw->cdns;
1206         struct sdw_cdns_streams *stream;
1207         struct snd_soc_dai_driver *dais;
1208         int num_dai, ret, off = 0;
1209
1210         /* DAIs are created based on total number of PDIs supported */
1211         num_dai = cdns->pcm.num_pdi + cdns->pdm.num_pdi;
1212
1213         dais = devm_kcalloc(cdns->dev, num_dai, sizeof(*dais), GFP_KERNEL);
1214         if (!dais)
1215                 return -ENOMEM;
1216
1217         /* Create PCM DAIs */
1218         stream = &cdns->pcm;
1219
1220         ret = intel_create_dai(cdns, dais, INTEL_PDI_IN, cdns->pcm.num_in,
1221                                off, stream->num_ch_in, true);
1222         if (ret)
1223                 return ret;
1224
1225         off += cdns->pcm.num_in;
1226         ret = intel_create_dai(cdns, dais, INTEL_PDI_OUT, cdns->pcm.num_out,
1227                                off, stream->num_ch_out, true);
1228         if (ret)
1229                 return ret;
1230
1231         off += cdns->pcm.num_out;
1232         ret = intel_create_dai(cdns, dais, INTEL_PDI_BD, cdns->pcm.num_bd,
1233                                off, stream->num_ch_bd, true);
1234         if (ret)
1235                 return ret;
1236
1237         /* Create PDM DAIs */
1238         stream = &cdns->pdm;
1239         off += cdns->pcm.num_bd;
1240         ret = intel_create_dai(cdns, dais, INTEL_PDI_IN, cdns->pdm.num_in,
1241                                off, stream->num_ch_in, false);
1242         if (ret)
1243                 return ret;
1244
1245         off += cdns->pdm.num_in;
1246         ret = intel_create_dai(cdns, dais, INTEL_PDI_OUT, cdns->pdm.num_out,
1247                                off, stream->num_ch_out, false);
1248         if (ret)
1249                 return ret;
1250
1251         off += cdns->pdm.num_out;
1252         ret = intel_create_dai(cdns, dais, INTEL_PDI_BD, cdns->pdm.num_bd,
1253                                off, stream->num_ch_bd, false);
1254         if (ret)
1255                 return ret;
1256
1257         return snd_soc_register_component(cdns->dev, &dai_component,
1258                                           dais, num_dai);
1259 }
1260
1261 static int sdw_master_read_intel_prop(struct sdw_bus *bus)
1262 {
1263         struct sdw_master_prop *prop = &bus->prop;
1264         struct fwnode_handle *link;
1265         char name[32];
1266         u32 quirk_mask;
1267
1268         /* Find master handle */
1269         snprintf(name, sizeof(name),
1270                  "mipi-sdw-link-%d-subproperties", bus->link_id);
1271
1272         link = device_get_named_child_node(bus->dev, name);
1273         if (!link) {
1274                 dev_err(bus->dev, "Master node %s not found\n", name);
1275                 return -EIO;
1276         }
1277
1278         fwnode_property_read_u32(link,
1279                                  "intel-sdw-ip-clock",
1280                                  &prop->mclk_freq);
1281
1282         /* the values reported by BIOS are the 2x clock, not the bus clock */
1283         prop->mclk_freq /= 2;
1284
1285         fwnode_property_read_u32(link,
1286                                  "intel-quirk-mask",
1287                                  &quirk_mask);
1288
1289         if (quirk_mask & SDW_INTEL_QUIRK_MASK_BUS_DISABLE)
1290                 prop->hw_disabled = true;
1291
1292         return 0;
1293 }
1294
1295 static int intel_prop_read(struct sdw_bus *bus)
1296 {
1297         /* Initialize with default handler to read all DisCo properties */
1298         sdw_master_read_prop(bus);
1299
1300         /* read Intel-specific properties */
1301         sdw_master_read_intel_prop(bus);
1302
1303         return 0;
1304 }
1305
1306 static struct sdw_master_ops sdw_intel_ops = {
1307         .read_prop = sdw_master_read_prop,
1308         .xfer_msg = cdns_xfer_msg,
1309         .xfer_msg_defer = cdns_xfer_msg_defer,
1310         .reset_page_addr = cdns_reset_page_addr,
1311         .set_bus_conf = cdns_bus_conf,
1312         .pre_bank_switch = intel_pre_bank_switch,
1313         .post_bank_switch = intel_post_bank_switch,
1314 };
1315
1316 static int intel_init(struct sdw_intel *sdw)
1317 {
1318         bool clock_stop;
1319
1320         /* Initialize shim and controller */
1321         intel_link_power_up(sdw);
1322
1323         clock_stop = sdw_cdns_is_clock_stop(&sdw->cdns);
1324
1325         intel_shim_init(sdw, clock_stop);
1326
1327         return 0;
1328 }
1329
1330 /*
1331  * probe and init
1332  */
1333 static int intel_master_probe(struct platform_device *pdev)
1334 {
1335         struct device *dev = &pdev->dev;
1336         struct sdw_intel *sdw;
1337         struct sdw_cdns *cdns;
1338         struct sdw_bus *bus;
1339         int ret;
1340
1341         sdw = devm_kzalloc(dev, sizeof(*sdw), GFP_KERNEL);
1342         if (!sdw)
1343                 return -ENOMEM;
1344
1345         cdns = &sdw->cdns;
1346         bus = &cdns->bus;
1347
1348         sdw->instance = pdev->id;
1349         sdw->link_res = dev_get_platdata(dev);
1350         cdns->dev = dev;
1351         cdns->registers = sdw->link_res->registers;
1352         cdns->instance = sdw->instance;
1353         cdns->msg_count = 0;
1354
1355         bus->link_id = pdev->id;
1356
1357         sdw_cdns_probe(cdns);
1358
1359         /* Set property read ops */
1360         sdw_intel_ops.read_prop = intel_prop_read;
1361         bus->ops = &sdw_intel_ops;
1362
1363         /* set driver data, accessed by snd_soc_dai_get_drvdata() */
1364         dev_set_drvdata(dev, cdns);
1365
1366         /* use generic bandwidth allocation algorithm */
1367         sdw->cdns.bus.compute_params = sdw_compute_params;
1368
1369         ret = sdw_bus_master_add(bus, dev, dev->fwnode);
1370         if (ret) {
1371                 dev_err(dev, "sdw_bus_master_add fail: %d\n", ret);
1372                 return ret;
1373         }
1374
1375         if (bus->prop.hw_disabled)
1376                 dev_info(dev,
1377                          "SoundWire master %d is disabled, will be ignored\n",
1378                          bus->link_id);
1379         /*
1380          * Ignore BIOS err_threshold, it's a really bad idea when dealing
1381          * with multiple hardware synchronized links
1382          */
1383         bus->prop.err_threshold = 0;
1384
1385         return 0;
1386 }
1387
1388 int intel_master_startup(struct platform_device *pdev)
1389 {
1390         struct sdw_cdns_stream_config config;
1391         struct device *dev = &pdev->dev;
1392         struct sdw_cdns *cdns = dev_get_drvdata(dev);
1393         struct sdw_intel *sdw = cdns_to_intel(cdns);
1394         struct sdw_bus *bus = &cdns->bus;
1395         int link_flags;
1396         bool multi_link;
1397         u32 clock_stop_quirks;
1398         int ret;
1399
1400         if (bus->prop.hw_disabled) {
1401                 dev_info(dev,
1402                          "SoundWire master %d is disabled, ignoring\n",
1403                          sdw->instance);
1404                 return 0;
1405         }
1406
1407         link_flags = md_flags >> (bus->link_id * 8);
1408         multi_link = !(link_flags & SDW_INTEL_MASTER_DISABLE_MULTI_LINK);
1409         if (!multi_link) {
1410                 dev_dbg(dev, "Multi-link is disabled\n");
1411                 bus->multi_link = false;
1412         } else {
1413                 /*
1414                  * hardware-based synchronization is required regardless
1415                  * of the number of segments used by a stream: SSP-based
1416                  * synchronization is gated by gsync when the multi-master
1417                  * mode is set.
1418                  */
1419                 bus->multi_link = true;
1420                 bus->hw_sync_min_links = 1;
1421         }
1422
1423         /* Initialize shim, controller */
1424         ret = intel_init(sdw);
1425         if (ret)
1426                 goto err_init;
1427
1428         /* Read the PDI config and initialize cadence PDI */
1429         intel_pdi_init(sdw, &config);
1430         ret = sdw_cdns_pdi_init(cdns, config);
1431         if (ret)
1432                 goto err_init;
1433
1434         intel_pdi_ch_update(sdw);
1435
1436         ret = sdw_cdns_enable_interrupt(cdns, true);
1437         if (ret < 0) {
1438                 dev_err(dev, "cannot enable interrupts\n");
1439                 goto err_init;
1440         }
1441
1442         /*
1443          * follow recommended programming flows to avoid timeouts when
1444          * gsync is enabled
1445          */
1446         if (multi_link)
1447                 intel_shim_sync_arm(sdw);
1448
1449         ret = sdw_cdns_init(cdns);
1450         if (ret < 0) {
1451                 dev_err(dev, "unable to initialize Cadence IP\n");
1452                 goto err_interrupt;
1453         }
1454
1455         ret = sdw_cdns_exit_reset(cdns);
1456         if (ret < 0) {
1457                 dev_err(dev, "unable to exit bus reset sequence\n");
1458                 goto err_interrupt;
1459         }
1460
1461         if (multi_link) {
1462                 ret = intel_shim_sync_go(sdw);
1463                 if (ret < 0) {
1464                         dev_err(dev, "sync go failed: %d\n", ret);
1465                         goto err_interrupt;
1466                 }
1467         }
1468
1469         /* Register DAIs */
1470         ret = intel_register_dai(sdw);
1471         if (ret) {
1472                 dev_err(dev, "DAI registration failed: %d\n", ret);
1473                 goto err_interrupt;
1474         }
1475
1476         intel_debugfs_init(sdw);
1477
1478         /* Enable runtime PM */
1479         if (!(link_flags & SDW_INTEL_MASTER_DISABLE_PM_RUNTIME)) {
1480                 pm_runtime_set_autosuspend_delay(dev,
1481                                                  INTEL_MASTER_SUSPEND_DELAY_MS);
1482                 pm_runtime_use_autosuspend(dev);
1483                 pm_runtime_mark_last_busy(dev);
1484
1485                 pm_runtime_set_active(dev);
1486                 pm_runtime_enable(dev);
1487         }
1488
1489         clock_stop_quirks = sdw->link_res->clock_stop_quirks;
1490         if (clock_stop_quirks & SDW_INTEL_CLK_STOP_NOT_ALLOWED) {
1491                 /*
1492                  * To keep the clock running we need to prevent
1493                  * pm_runtime suspend from happening by increasing the
1494                  * reference count.
1495                  * This quirk is specified by the parent PCI device in
1496                  * case of specific latency requirements. It will have
1497                  * no effect if pm_runtime is disabled by the user via
1498                  * a module parameter for testing purposes.
1499                  */
1500                 pm_runtime_get_noresume(dev);
1501         }
1502
1503         /*
1504          * The runtime PM status of Slave devices is "Unsupported"
1505          * until they report as ATTACHED. If they don't, e.g. because
1506          * there are no Slave devices populated or if the power-on is
1507          * delayed or dependent on a power switch, the Master will
1508          * remain active and prevent its parent from suspending.
1509          *
1510          * Conditionally force the pm_runtime core to re-evaluate the
1511          * Master status in the absence of any Slave activity. A quirk
1512          * is provided to e.g. deal with Slaves that may be powered on
1513          * with a delay. A more complete solution would require the
1514          * definition of Master properties.
1515          */
1516         if (!(link_flags & SDW_INTEL_MASTER_DISABLE_PM_RUNTIME_IDLE))
1517                 pm_runtime_idle(dev);
1518
1519         return 0;
1520
1521 err_interrupt:
1522         sdw_cdns_enable_interrupt(cdns, false);
1523 err_init:
1524         return ret;
1525 }
1526
1527 static int intel_master_remove(struct platform_device *pdev)
1528 {
1529         struct device *dev = &pdev->dev;
1530         struct sdw_cdns *cdns = dev_get_drvdata(dev);
1531         struct sdw_intel *sdw = cdns_to_intel(cdns);
1532         struct sdw_bus *bus = &cdns->bus;
1533
1534         /*
1535          * Since pm_runtime is already disabled, we don't decrease
1536          * the refcount when the clock_stop_quirk is
1537          * SDW_INTEL_CLK_STOP_NOT_ALLOWED
1538          */
1539         if (!bus->prop.hw_disabled) {
1540                 intel_debugfs_exit(sdw);
1541                 sdw_cdns_enable_interrupt(cdns, false);
1542                 snd_soc_unregister_component(dev);
1543         }
1544         sdw_bus_master_delete(bus);
1545
1546         return 0;
1547 }
1548
1549 int intel_master_process_wakeen_event(struct platform_device *pdev)
1550 {
1551         struct device *dev = &pdev->dev;
1552         struct sdw_intel *sdw;
1553         struct sdw_bus *bus;
1554         void __iomem *shim;
1555         u16 wake_sts;
1556
1557         sdw = platform_get_drvdata(pdev);
1558         bus = &sdw->cdns.bus;
1559
1560         if (bus->prop.hw_disabled) {
1561                 dev_dbg(dev, "SoundWire master %d is disabled, ignoring\n", bus->link_id);
1562                 return 0;
1563         }
1564
1565         shim = sdw->link_res->shim;
1566         wake_sts = intel_readw(shim, SDW_SHIM_WAKESTS);
1567
1568         if (!(wake_sts & BIT(sdw->instance)))
1569                 return 0;
1570
1571         /* disable WAKEEN interrupt ASAP to prevent interrupt flood */
1572         intel_shim_wake(sdw, false);
1573
1574         /*
1575          * resume the Master, which will generate a bus reset and result in
1576          * Slaves re-attaching and be re-enumerated. The SoundWire physical
1577          * device which generated the wake will trigger an interrupt, which
1578          * will in turn cause the corresponding Linux Slave device to be
1579          * resumed and the Slave codec driver to check the status.
1580          */
1581         pm_request_resume(dev);
1582
1583         return 0;
1584 }
1585
1586 /*
1587  * PM calls
1588  */
1589
1590 #ifdef CONFIG_PM
1591
1592 static int __maybe_unused intel_suspend(struct device *dev)
1593 {
1594         struct sdw_cdns *cdns = dev_get_drvdata(dev);
1595         struct sdw_intel *sdw = cdns_to_intel(cdns);
1596         struct sdw_bus *bus = &cdns->bus;
1597         u32 clock_stop_quirks;
1598         int ret;
1599
1600         if (bus->prop.hw_disabled) {
1601                 dev_dbg(dev, "SoundWire master %d is disabled, ignoring\n",
1602                         bus->link_id);
1603                 return 0;
1604         }
1605
1606         if (pm_runtime_suspended(dev)) {
1607                 dev_dbg(dev, "%s: pm_runtime status: suspended\n", __func__);
1608
1609                 clock_stop_quirks = sdw->link_res->clock_stop_quirks;
1610
1611                 if ((clock_stop_quirks & SDW_INTEL_CLK_STOP_BUS_RESET ||
1612                      !clock_stop_quirks) &&
1613                     !pm_runtime_suspended(dev->parent)) {
1614
1615                         /*
1616                          * if we've enabled clock stop, and the parent
1617                          * is still active, disable shim wake. The
1618                          * SHIM registers are not accessible if the
1619                          * parent is already pm_runtime suspended so
1620                          * it's too late to change that configuration
1621                          */
1622
1623                         intel_shim_wake(sdw, false);
1624                 }
1625
1626                 return 0;
1627         }
1628
1629         ret = sdw_cdns_enable_interrupt(cdns, false);
1630         if (ret < 0) {
1631                 dev_err(dev, "cannot disable interrupts on suspend\n");
1632                 return ret;
1633         }
1634
1635         ret = intel_link_power_down(sdw);
1636         if (ret) {
1637                 dev_err(dev, "Link power down failed: %d", ret);
1638                 return ret;
1639         }
1640
1641         intel_shim_wake(sdw, false);
1642
1643         return 0;
1644 }
1645
1646 static int intel_suspend_runtime(struct device *dev)
1647 {
1648         struct sdw_cdns *cdns = dev_get_drvdata(dev);
1649         struct sdw_intel *sdw = cdns_to_intel(cdns);
1650         struct sdw_bus *bus = &cdns->bus;
1651         u32 clock_stop_quirks;
1652         int ret;
1653
1654         if (bus->prop.hw_disabled) {
1655                 dev_dbg(dev, "SoundWire master %d is disabled, ignoring\n",
1656                         bus->link_id);
1657                 return 0;
1658         }
1659
1660         clock_stop_quirks = sdw->link_res->clock_stop_quirks;
1661
1662         if (clock_stop_quirks & SDW_INTEL_CLK_STOP_TEARDOWN) {
1663
1664                 ret = sdw_cdns_enable_interrupt(cdns, false);
1665                 if (ret < 0) {
1666                         dev_err(dev, "cannot disable interrupts on suspend\n");
1667                         return ret;
1668                 }
1669
1670                 ret = intel_link_power_down(sdw);
1671                 if (ret) {
1672                         dev_err(dev, "Link power down failed: %d", ret);
1673                         return ret;
1674                 }
1675
1676                 intel_shim_wake(sdw, false);
1677
1678         } else if (clock_stop_quirks & SDW_INTEL_CLK_STOP_BUS_RESET ||
1679                    !clock_stop_quirks) {
1680                 ret = sdw_cdns_clock_stop(cdns, true);
1681                 if (ret < 0) {
1682                         dev_err(dev, "cannot enable clock stop on suspend\n");
1683                         return ret;
1684                 }
1685
1686                 ret = sdw_cdns_enable_interrupt(cdns, false);
1687                 if (ret < 0) {
1688                         dev_err(dev, "cannot disable interrupts on suspend\n");
1689                         return ret;
1690                 }
1691
1692                 ret = intel_link_power_down(sdw);
1693                 if (ret) {
1694                         dev_err(dev, "Link power down failed: %d", ret);
1695                         return ret;
1696                 }
1697
1698                 intel_shim_wake(sdw, true);
1699         } else {
1700                 dev_err(dev, "%s clock_stop_quirks %x unsupported\n",
1701                         __func__, clock_stop_quirks);
1702                 ret = -EINVAL;
1703         }
1704
1705         return ret;
1706 }
1707
1708 static int __maybe_unused intel_resume(struct device *dev)
1709 {
1710         struct sdw_cdns *cdns = dev_get_drvdata(dev);
1711         struct sdw_intel *sdw = cdns_to_intel(cdns);
1712         struct sdw_bus *bus = &cdns->bus;
1713         int link_flags;
1714         bool multi_link;
1715         int ret;
1716
1717         if (bus->prop.hw_disabled) {
1718                 dev_dbg(dev, "SoundWire master %d is disabled, ignoring\n",
1719                         bus->link_id);
1720                 return 0;
1721         }
1722
1723         link_flags = md_flags >> (bus->link_id * 8);
1724         multi_link = !(link_flags & SDW_INTEL_MASTER_DISABLE_MULTI_LINK);
1725
1726         if (pm_runtime_suspended(dev)) {
1727                 dev_dbg(dev, "%s: pm_runtime status was suspended, forcing active\n", __func__);
1728
1729                 /* follow required sequence from runtime_pm.rst */
1730                 pm_runtime_disable(dev);
1731                 pm_runtime_set_active(dev);
1732                 pm_runtime_mark_last_busy(dev);
1733                 pm_runtime_enable(dev);
1734
1735                 link_flags = md_flags >> (bus->link_id * 8);
1736
1737                 if (!(link_flags & SDW_INTEL_MASTER_DISABLE_PM_RUNTIME_IDLE))
1738                         pm_runtime_idle(dev);
1739         }
1740
1741         ret = intel_init(sdw);
1742         if (ret) {
1743                 dev_err(dev, "%s failed: %d", __func__, ret);
1744                 return ret;
1745         }
1746
1747         /*
1748          * make sure all Slaves are tagged as UNATTACHED and provide
1749          * reason for reinitialization
1750          */
1751         sdw_clear_slave_status(bus, SDW_UNATTACH_REQUEST_MASTER_RESET);
1752
1753         ret = sdw_cdns_enable_interrupt(cdns, true);
1754         if (ret < 0) {
1755                 dev_err(dev, "cannot enable interrupts during resume\n");
1756                 return ret;
1757         }
1758
1759         /*
1760          * follow recommended programming flows to avoid timeouts when
1761          * gsync is enabled
1762          */
1763         if (multi_link)
1764                 intel_shim_sync_arm(sdw);
1765
1766         ret = sdw_cdns_init(&sdw->cdns);
1767         if (ret < 0) {
1768                 dev_err(dev, "unable to initialize Cadence IP during resume\n");
1769                 return ret;
1770         }
1771
1772         ret = sdw_cdns_exit_reset(cdns);
1773         if (ret < 0) {
1774                 dev_err(dev, "unable to exit bus reset sequence during resume\n");
1775                 return ret;
1776         }
1777
1778         if (multi_link) {
1779                 ret = intel_shim_sync_go(sdw);
1780                 if (ret < 0) {
1781                         dev_err(dev, "sync go failed during resume\n");
1782                         return ret;
1783                 }
1784         }
1785
1786         /*
1787          * after system resume, the pm_runtime suspend() may kick in
1788          * during the enumeration, before any children device force the
1789          * master device to remain active.  Using pm_runtime_get()
1790          * routines is not really possible, since it'd prevent the
1791          * master from suspending.
1792          * A reasonable compromise is to update the pm_runtime
1793          * counters and delay the pm_runtime suspend by several
1794          * seconds, by when all enumeration should be complete.
1795          */
1796         pm_runtime_mark_last_busy(dev);
1797
1798         return ret;
1799 }
1800
1801 static int intel_resume_runtime(struct device *dev)
1802 {
1803         struct sdw_cdns *cdns = dev_get_drvdata(dev);
1804         struct sdw_intel *sdw = cdns_to_intel(cdns);
1805         struct sdw_bus *bus = &cdns->bus;
1806         u32 clock_stop_quirks;
1807         bool clock_stop0;
1808         int link_flags;
1809         bool multi_link;
1810         int status;
1811         int ret;
1812
1813         if (bus->prop.hw_disabled) {
1814                 dev_dbg(dev, "SoundWire master %d is disabled, ignoring\n",
1815                         bus->link_id);
1816                 return 0;
1817         }
1818
1819         link_flags = md_flags >> (bus->link_id * 8);
1820         multi_link = !(link_flags & SDW_INTEL_MASTER_DISABLE_MULTI_LINK);
1821
1822         clock_stop_quirks = sdw->link_res->clock_stop_quirks;
1823
1824         if (clock_stop_quirks & SDW_INTEL_CLK_STOP_TEARDOWN) {
1825                 ret = intel_init(sdw);
1826                 if (ret) {
1827                         dev_err(dev, "%s failed: %d", __func__, ret);
1828                         return ret;
1829                 }
1830
1831                 /*
1832                  * make sure all Slaves are tagged as UNATTACHED and provide
1833                  * reason for reinitialization
1834                  */
1835                 sdw_clear_slave_status(bus, SDW_UNATTACH_REQUEST_MASTER_RESET);
1836
1837                 ret = sdw_cdns_enable_interrupt(cdns, true);
1838                 if (ret < 0) {
1839                         dev_err(dev, "cannot enable interrupts during resume\n");
1840                         return ret;
1841                 }
1842
1843                 /*
1844                  * follow recommended programming flows to avoid
1845                  * timeouts when gsync is enabled
1846                  */
1847                 if (multi_link)
1848                         intel_shim_sync_arm(sdw);
1849
1850                 ret = sdw_cdns_init(&sdw->cdns);
1851                 if (ret < 0) {
1852                         dev_err(dev, "unable to initialize Cadence IP during resume\n");
1853                         return ret;
1854                 }
1855
1856                 ret = sdw_cdns_exit_reset(cdns);
1857                 if (ret < 0) {
1858                         dev_err(dev, "unable to exit bus reset sequence during resume\n");
1859                         return ret;
1860                 }
1861
1862                 if (multi_link) {
1863                         ret = intel_shim_sync_go(sdw);
1864                         if (ret < 0) {
1865                                 dev_err(dev, "sync go failed during resume\n");
1866                                 return ret;
1867                         }
1868                 }
1869         } else if (clock_stop_quirks & SDW_INTEL_CLK_STOP_BUS_RESET) {
1870                 ret = intel_init(sdw);
1871                 if (ret) {
1872                         dev_err(dev, "%s failed: %d", __func__, ret);
1873                         return ret;
1874                 }
1875
1876                 /*
1877                  * An exception condition occurs for the CLK_STOP_BUS_RESET
1878                  * case if one or more masters remain active. In this condition,
1879                  * all the masters are powered on for they are in the same power
1880                  * domain. Master can preserve its context for clock stop0, so
1881                  * there is no need to clear slave status and reset bus.
1882                  */
1883                 clock_stop0 = sdw_cdns_is_clock_stop(&sdw->cdns);
1884
1885                 if (!clock_stop0) {
1886
1887                         /*
1888                          * make sure all Slaves are tagged as UNATTACHED and
1889                          * provide reason for reinitialization
1890                          */
1891
1892                         status = SDW_UNATTACH_REQUEST_MASTER_RESET;
1893                         sdw_clear_slave_status(bus, status);
1894
1895                         ret = sdw_cdns_enable_interrupt(cdns, true);
1896                         if (ret < 0) {
1897                                 dev_err(dev, "cannot enable interrupts during resume\n");
1898                                 return ret;
1899                         }
1900
1901                         /*
1902                          * follow recommended programming flows to avoid
1903                          * timeouts when gsync is enabled
1904                          */
1905                         if (multi_link)
1906                                 intel_shim_sync_arm(sdw);
1907
1908                         /*
1909                          * Re-initialize the IP since it was powered-off
1910                          */
1911                         sdw_cdns_init(&sdw->cdns);
1912
1913                 } else {
1914                         ret = sdw_cdns_enable_interrupt(cdns, true);
1915                         if (ret < 0) {
1916                                 dev_err(dev, "cannot enable interrupts during resume\n");
1917                                 return ret;
1918                         }
1919                 }
1920
1921                 ret = sdw_cdns_clock_restart(cdns, !clock_stop0);
1922                 if (ret < 0) {
1923                         dev_err(dev, "unable to restart clock during resume\n");
1924                         return ret;
1925                 }
1926
1927                 if (!clock_stop0) {
1928                         ret = sdw_cdns_exit_reset(cdns);
1929                         if (ret < 0) {
1930                                 dev_err(dev, "unable to exit bus reset sequence during resume\n");
1931                                 return ret;
1932                         }
1933
1934                         if (multi_link) {
1935                                 ret = intel_shim_sync_go(sdw);
1936                                 if (ret < 0) {
1937                                         dev_err(sdw->cdns.dev, "sync go failed during resume\n");
1938                                         return ret;
1939                                 }
1940                         }
1941                 }
1942         } else if (!clock_stop_quirks) {
1943
1944                 clock_stop0 = sdw_cdns_is_clock_stop(&sdw->cdns);
1945                 if (!clock_stop0)
1946                         dev_err(dev, "%s invalid configuration, clock was not stopped", __func__);
1947
1948                 ret = intel_init(sdw);
1949                 if (ret) {
1950                         dev_err(dev, "%s failed: %d", __func__, ret);
1951                         return ret;
1952                 }
1953
1954                 ret = sdw_cdns_enable_interrupt(cdns, true);
1955                 if (ret < 0) {
1956                         dev_err(dev, "cannot enable interrupts during resume\n");
1957                         return ret;
1958                 }
1959
1960                 ret = sdw_cdns_clock_restart(cdns, false);
1961                 if (ret < 0) {
1962                         dev_err(dev, "unable to resume master during resume\n");
1963                         return ret;
1964                 }
1965         } else {
1966                 dev_err(dev, "%s clock_stop_quirks %x unsupported\n",
1967                         __func__, clock_stop_quirks);
1968                 ret = -EINVAL;
1969         }
1970
1971         return ret;
1972 }
1973
1974 #endif
1975
1976 static const struct dev_pm_ops intel_pm = {
1977         SET_SYSTEM_SLEEP_PM_OPS(intel_suspend, intel_resume)
1978         SET_RUNTIME_PM_OPS(intel_suspend_runtime, intel_resume_runtime, NULL)
1979 };
1980
1981 static struct platform_driver sdw_intel_drv = {
1982         .probe = intel_master_probe,
1983         .remove = intel_master_remove,
1984         .driver = {
1985                 .name = "intel-sdw",
1986                 .pm = &intel_pm,
1987         }
1988 };
1989
1990 module_platform_driver(sdw_intel_drv);
1991
1992 MODULE_LICENSE("Dual BSD/GPL");
1993 MODULE_ALIAS("platform:intel-sdw");
1994 MODULE_DESCRIPTION("Intel Soundwire Master Driver");