drivers/clk/renesas/renesas-cpg-mssr.c

   1 /*
   2  * Renesas Clock Pulse Generator / Module Standby and Software Reset
   3  *
   4  * Copyright (C) 2015 Glider bvba
   5  *
   6  * Based on clk-mstp.c, clk-rcar-gen2.c, and clk-rcar-gen3.c
   7  *
   8  * Copyright (C) 2013 Ideas On Board SPRL
   9  * Copyright (C) 2015 Renesas Electronics Corp.
  10  *
  11  * This program is free software; you can redistribute it and/or modify
  12  * it under the terms of the GNU General Public License as published by
  13  * the Free Software Foundation; version 2 of the License.
  14  */
  15
  16 #include <linux/clk.h>
  17 #include <linux/clk-provider.h>
  18 #include <linux/clk/renesas.h>
  19 #include <linux/delay.h>
  20 #include <linux/device.h>
  21 #include <linux/init.h>
  22 #include <linux/mod_devicetable.h>
  23 #include <linux/module.h>
  24 #include <linux/of_address.h>
  25 #include <linux/of_device.h>
  26 #include <linux/platform_device.h>
  27 #include <linux/pm_clock.h>
  28 #include <linux/pm_domain.h>
  29 #include <linux/psci.h>
  30 #include <linux/reset-controller.h>
  31 #include <linux/slab.h>
  32
  33 #include <dt-bindings/clock/renesas-cpg-mssr.h>
  34
  35 #include "renesas-cpg-mssr.h"
  36 #include "clk-div6.h"
  37
  38 #ifdef DEBUG
  39 #define WARN_DEBUG(x)   WARN_ON(x)
  40 #else
  41 #define WARN_DEBUG(x)   do { } while (0)
  42 #endif
  43
  44
  45 /*
  46  * Module Standby and Software Reset register offets.
  47  *
  48  * If the registers exist, these are valid for SH-Mobile, R-Mobile,
  49  * R-Car Gen2, R-Car Gen3, and RZ/G1.
  50  * These are NOT valid for R-Car Gen1 and RZ/A1!
  51  */
  52
  53 /*
  54  * Module Stop Status Register offsets
  55  */
  56
  57 static const u16 mstpsr[] = {
  58         0x030, 0x038, 0x040, 0x048, 0x04C, 0x03C, 0x1C0, 0x1C4,
  59         0x9A0, 0x9A4, 0x9A8, 0x9AC,
  60 };
  61
  62 #define MSTPSR(i)       mstpsr[i]
  63
  64
  65 /*
  66  * System Module Stop Control Register offsets
  67  */
  68
  69 static const u16 smstpcr[] = {
  70         0x130, 0x134, 0x138, 0x13C, 0x140, 0x144, 0x148, 0x14C,
  71         0x990, 0x994, 0x998, 0x99C,
  72 };
  73
  74 #define SMSTPCR(i)      smstpcr[i]
  75
  76
  77 /*
  78  * Software Reset Register offsets
  79  */
  80
  81 static const u16 srcr[] = {
  82         0x0A0, 0x0A8, 0x0B0, 0x0B8, 0x0BC, 0x0C4, 0x1C8, 0x1CC,
  83         0x920, 0x924, 0x928, 0x92C,
  84 };
  85
  86 #define SRCR(i)         srcr[i]
  87
  88
  89 /* Realtime Module Stop Control Register offsets */
  90 #define RMSTPCR(i)      (smstpcr[i] - 0x20)
  91
  92 /* Modem Module Stop Control Register offsets (r8a73a4) */
  93 #define MMSTPCR(i)      (smstpcr[i] + 0x20)
  94
  95 /* Software Reset Clearing Register offsets */
  96 #define SRSTCLR(i)      (0x940 + (i) * 4)
  97
  98
  99 /**
 100  * Clock Pulse Generator / Module Standby and Software Reset Private Data
 101  *
 102  * @rcdev: Optional reset controller entity
 103  * @dev: CPG/MSSR device
 104  * @base: CPG/MSSR register block base address
 105  * @rmw_lock: protects RMW register accesses
 106  * @clks: Array containing all Core and Module Clocks
 107  * @num_core_clks: Number of Core Clocks in clks[]
 108  * @num_mod_clks: Number of Module Clocks in clks[]
 109  * @last_dt_core_clk: ID of the last Core Clock exported to DT
 110  * @notifiers: Notifier chain to save/restore clock state for system resume
 111  * @smstpcr_saved[].mask: Mask of SMSTPCR[] bits under our control
 112  * @smstpcr_saved[].val: Saved values of SMSTPCR[]
 113  */
 114 struct cpg_mssr_priv {
 115 #ifdef CONFIG_RESET_CONTROLLER
 116         struct reset_controller_dev rcdev;
 117 #endif
 118         struct device *dev;
 119         void __iomem *base;
 120         spinlock_t rmw_lock;
 121
 122         struct clk **clks;
 123         unsigned int num_core_clks;
 124         unsigned int num_mod_clks;
 125         unsigned int last_dt_core_clk;
 126
 127         struct raw_notifier_head notifiers;
 128         struct {
 129                 u32 mask;
 130                 u32 val;
 131         } smstpcr_saved[ARRAY_SIZE(smstpcr)];
 132 };
 133
 134
 135 /**
 136  * struct mstp_clock - MSTP gating clock
 137  * @hw: handle between common and hardware-specific interfaces
 138  * @index: MSTP clock number
 139  * @priv: CPG/MSSR private data
 140  */
 141 struct mstp_clock {
 142         struct clk_hw hw;
 143         u32 index;
 144         struct cpg_mssr_priv *priv;
 145 };
 146
 147 #define to_mstp_clock(_hw) container_of(_hw, struct mstp_clock, hw)
 148
 149 static int cpg_mstp_clock_endisable(struct clk_hw *hw, bool enable)
 150 {
 151         struct mstp_clock *clock = to_mstp_clock(hw);
 152         struct cpg_mssr_priv *priv = clock->priv;
 153         unsigned int reg = clock->index / 32;
 154         unsigned int bit = clock->index % 32;
 155         struct device *dev = priv->dev;
 156         u32 bitmask = BIT(bit);
 157         unsigned long flags;
 158         unsigned int i;
 159         u32 value;
 160
 161         dev_dbg(dev, "MSTP %u%02u/%pC %s\n", reg, bit, hw->clk,
 162                 enable ? "ON" : "OFF");
 163         spin_lock_irqsave(&priv->rmw_lock, flags);
 164
 165         value = readl(priv->base + SMSTPCR(reg));
 166         if (enable)
 167                 value &= ~bitmask;
 168         else
 169                 value |= bitmask;
 170         writel(value, priv->base + SMSTPCR(reg));
 171
 172         spin_unlock_irqrestore(&priv->rmw_lock, flags);
 173
 174         if (!enable)
 175                 return 0;
 176
 177         for (i = 1000; i > 0; --i) {
 178                 if (!(readl(priv->base + MSTPSR(reg)) & bitmask))
 179                         break;
 180                 cpu_relax();
 181         }
 182
 183         if (!i) {
 184                 dev_err(dev, "Failed to enable SMSTP %p[%d]\n",
 185                         priv->base + SMSTPCR(reg), bit);
 186                 return -ETIMEDOUT;
 187         }
 188
 189         return 0;
 190 }
 191
 192 static int cpg_mstp_clock_enable(struct clk_hw *hw)
 193 {
 194         return cpg_mstp_clock_endisable(hw, true);
 195 }
 196
 197 static void cpg_mstp_clock_disable(struct clk_hw *hw)
 198 {
 199         cpg_mstp_clock_endisable(hw, false);
 200 }
 201
 202 static int cpg_mstp_clock_is_enabled(struct clk_hw *hw)
 203 {
 204         struct mstp_clock *clock = to_mstp_clock(hw);
 205         struct cpg_mssr_priv *priv = clock->priv;
 206         u32 value;
 207
 208         value = readl(priv->base + MSTPSR(clock->index / 32));
 209
 210         return !(value & BIT(clock->index % 32));
 211 }
 212
 213 static const struct clk_ops cpg_mstp_clock_ops = {
 214         .enable = cpg_mstp_clock_enable,
 215         .disable = cpg_mstp_clock_disable,
 216         .is_enabled = cpg_mstp_clock_is_enabled,
 217 };
 218
 219 static
 220 struct clk *cpg_mssr_clk_src_twocell_get(struct of_phandle_args *clkspec,
 221                                          void *data)
 222 {
 223         unsigned int clkidx = clkspec->args[1];
 224         struct cpg_mssr_priv *priv = data;
 225         struct device *dev = priv->dev;
 226         unsigned int idx;
 227         const char *type;
 228         struct clk *clk;
 229
 230         switch (clkspec->args[0]) {
 231         case CPG_CORE:
 232                 type = "core";
 233                 if (clkidx > priv->last_dt_core_clk) {
 234                         dev_err(dev, "Invalid %s clock index %u\n", type,
 235                                clkidx);
 236                         return ERR_PTR(-EINVAL);
 237                 }
 238                 clk = priv->clks[clkidx];
 239                 break;
 240
 241         case CPG_MOD:
 242                 type = "module";
 243                 idx = MOD_CLK_PACK(clkidx);
 244                 if (clkidx % 100 > 31 || idx >= priv->num_mod_clks) {
 245                         dev_err(dev, "Invalid %s clock index %u\n", type,
 246                                 clkidx);
 247                         return ERR_PTR(-EINVAL);
 248                 }
 249                 clk = priv->clks[priv->num_core_clks + idx];
 250                 break;
 251
 252         default:
 253                 dev_err(dev, "Invalid CPG clock type %u\n", clkspec->args[0]);
 254                 return ERR_PTR(-EINVAL);
 255         }
 256
 257         if (IS_ERR(clk))
 258                 dev_err(dev, "Cannot get %s clock %u: %ld", type, clkidx,
 259                        PTR_ERR(clk));
 260         else
 261                 dev_dbg(dev, "clock (%u, %u) is %pC at %pCr Hz\n",
 262                         clkspec->args[0], clkspec->args[1], clk, clk);
 263         return clk;
 264 }
 265
 266 static void __init cpg_mssr_register_core_clk(const struct cpg_core_clk *core,
 267                                               const struct cpg_mssr_info *info,
 268                                               struct cpg_mssr_priv *priv)
 269 {
 270         struct clk *clk = ERR_PTR(-ENOTSUPP), *parent;
 271         struct device *dev = priv->dev;
 272         unsigned int id = core->id, div = core->div;
 273         const char *parent_name;
 274
 275         WARN_DEBUG(id >= priv->num_core_clks);
 276         WARN_DEBUG(PTR_ERR(priv->clks[id]) != -ENOENT);
 277
 278         if (!core->name) {
 279                 /* Skip NULLified clock */
 280                 return;
 281         }
 282
 283         switch (core->type) {
 284         case CLK_TYPE_IN:
 285                 clk = of_clk_get_by_name(priv->dev->of_node, core->name);
 286                 break;
 287
 288         case CLK_TYPE_FF:
 289         case CLK_TYPE_DIV6P1:
 290         case CLK_TYPE_DIV6_RO:
 291                 WARN_DEBUG(core->parent >= priv->num_core_clks);
 292                 parent = priv->clks[core->parent];
 293                 if (IS_ERR(parent)) {
 294                         clk = parent;
 295                         goto fail;
 296                 }
 297
 298                 parent_name = __clk_get_name(parent);
 299
 300                 if (core->type == CLK_TYPE_DIV6_RO)
 301                         /* Multiply with the DIV6 register value */
 302                         div *= (readl(priv->base + core->offset) & 0x3f) + 1;
 303
 304                 if (core->type == CLK_TYPE_DIV6P1) {
 305                         clk = cpg_div6_register(core->name, 1, &parent_name,
 306                                                 priv->base + core->offset,
 307                                                 &priv->notifiers);
 308                 } else {
 309                         clk = clk_register_fixed_factor(NULL, core->name,
 310                                                         parent_name, 0,
 311                                                         core->mult, div);
 312                 }
 313                 break;
 314
 315         default:
 316                 if (info->cpg_clk_register)
 317                         clk = info->cpg_clk_register(dev, core, info,
 318                                                      priv->clks, priv->base,
 319                                                      &priv->notifiers);
 320                 else
 321                         dev_err(dev, "%s has unsupported core clock type %u\n",
 322                                 core->name, core->type);
 323                 break;
 324         }
 325
 326         if (IS_ERR_OR_NULL(clk))
 327                 goto fail;
 328
 329         dev_dbg(dev, "Core clock %pC at %pCr Hz\n", clk, clk);
 330         priv->clks[id] = clk;
 331         return;
 332
 333 fail:
 334         dev_err(dev, "Failed to register %s clock %s: %ld\n", "core",
 335                 core->name, PTR_ERR(clk));
 336 }
 337
 338 static void __init cpg_mssr_register_mod_clk(const struct mssr_mod_clk *mod,
 339                                              const struct cpg_mssr_info *info,
 340                                              struct cpg_mssr_priv *priv)
 341 {
 342         struct mstp_clock *clock = NULL;
 343         struct device *dev = priv->dev;
 344         unsigned int id = mod->id;
 345         struct clk_init_data init;
 346         struct clk *parent, *clk;
 347         const char *parent_name;
 348         unsigned int i;
 349
 350         WARN_DEBUG(id < priv->num_core_clks);
 351         WARN_DEBUG(id >= priv->num_core_clks + priv->num_mod_clks);
 352         WARN_DEBUG(mod->parent >= priv->num_core_clks + priv->num_mod_clks);
 353         WARN_DEBUG(PTR_ERR(priv->clks[id]) != -ENOENT);
 354
 355         if (!mod->name) {
 356                 /* Skip NULLified clock */
 357                 return;
 358         }
 359
 360         parent = priv->clks[mod->parent];
 361         if (IS_ERR(parent)) {
 362                 clk = parent;
 363                 goto fail;
 364         }
 365
 366         clock = kzalloc(sizeof(*clock), GFP_KERNEL);
 367         if (!clock) {
 368                 clk = ERR_PTR(-ENOMEM);
 369                 goto fail;
 370         }
 371
 372         init.name = mod->name;
 373         init.ops = &cpg_mstp_clock_ops;
 374         init.flags = CLK_IS_BASIC | CLK_SET_RATE_PARENT;
 375         for (i = 0; i < info->num_crit_mod_clks; i++)
 376                 if (id == info->crit_mod_clks[i]) {
 377                         dev_dbg(dev, "MSTP %s setting CLK_IS_CRITICAL\n",
 378                                 mod->name);
 379                         init.flags |= CLK_IS_CRITICAL;
 380                         break;
 381                 }
 382
 383         parent_name = __clk_get_name(parent);
 384         init.parent_names = &parent_name;
 385         init.num_parents = 1;
 386
 387         clock->index = id - priv->num_core_clks;
 388         clock->priv = priv;
 389         clock->hw.init = &init;
 390
 391         clk = clk_register(NULL, &clock->hw);
 392         if (IS_ERR(clk))
 393                 goto fail;
 394
 395         dev_dbg(dev, "Module clock %pC at %pCr Hz\n", clk, clk);
 396         priv->clks[id] = clk;
 397         priv->smstpcr_saved[clock->index / 32].mask |= BIT(clock->index % 32);
 398         return;
 399
 400 fail:
 401         dev_err(dev, "Failed to register %s clock %s: %ld\n", "module",
 402                 mod->name, PTR_ERR(clk));
 403         kfree(clock);
 404 }
 405
 406 struct cpg_mssr_clk_domain {
 407         struct generic_pm_domain genpd;
 408         struct device_node *np;
 409         unsigned int num_core_pm_clks;
 410         unsigned int core_pm_clks[0];
 411 };
 412
 413 static struct cpg_mssr_clk_domain *cpg_mssr_clk_domain;
 414
 415 static bool cpg_mssr_is_pm_clk(const struct of_phandle_args *clkspec,
 416                                struct cpg_mssr_clk_domain *pd)
 417 {
 418         unsigned int i;
 419
 420         if (clkspec->np != pd->np || clkspec->args_count != 2)
 421                 return false;
 422
 423         switch (clkspec->args[0]) {
 424         case CPG_CORE:
 425                 for (i = 0; i < pd->num_core_pm_clks; i++)
 426                         if (clkspec->args[1] == pd->core_pm_clks[i])
 427                                 return true;
 428                 return false;
 429
 430         case CPG_MOD:
 431                 return true;
 432
 433         default:
 434                 return false;
 435         }
 436 }
 437
 438 int cpg_mssr_attach_dev(struct generic_pm_domain *unused, struct device *dev)
 439 {
 440         struct cpg_mssr_clk_domain *pd = cpg_mssr_clk_domain;
 441         struct device_node *np = dev->of_node;
 442         struct of_phandle_args clkspec;
 443         struct clk *clk;
 444         int i = 0;
 445         int error;
 446
 447         if (!pd) {
 448                 dev_dbg(dev, "CPG/MSSR clock domain not yet available\n");
 449                 return -EPROBE_DEFER;
 450         }
 451
 452         while (!of_parse_phandle_with_args(np, "clocks", "#clock-cells", i,
 453                                            &clkspec)) {
 454                 if (cpg_mssr_is_pm_clk(&clkspec, pd))
 455                         goto found;
 456
 457                 of_node_put(clkspec.np);
 458                 i++;
 459         }
 460
 461         return 0;
 462
 463 found:
 464         clk = of_clk_get_from_provider(&clkspec);
 465         of_node_put(clkspec.np);
 466
 467         if (IS_ERR(clk))
 468                 return PTR_ERR(clk);
 469
 470         error = pm_clk_create(dev);
 471         if (error) {
 472                 dev_err(dev, "pm_clk_create failed %d\n", error);
 473                 goto fail_put;
 474         }
 475
 476         error = pm_clk_add_clk(dev, clk);
 477         if (error) {
 478                 dev_err(dev, "pm_clk_add_clk %pC failed %d\n", clk, error);
 479                 goto fail_destroy;
 480         }
 481
 482         return 0;
 483
 484 fail_destroy:
 485         pm_clk_destroy(dev);
 486 fail_put:
 487         clk_put(clk);
 488         return error;
 489 }
 490
 491 void cpg_mssr_detach_dev(struct generic_pm_domain *unused, struct device *dev)
 492 {
 493         if (!pm_clk_no_clocks(dev))
 494                 pm_clk_destroy(dev);
 495 }
 496
 497 static int __init cpg_mssr_add_clk_domain(struct device *dev,
 498                                           const unsigned int *core_pm_clks,
 499                                           unsigned int num_core_pm_clks)
 500 {
 501         struct device_node *np = dev->of_node;
 502         struct generic_pm_domain *genpd;
 503         struct cpg_mssr_clk_domain *pd;
 504         size_t pm_size = num_core_pm_clks * sizeof(core_pm_clks[0]);
 505
 506         pd = devm_kzalloc(dev, sizeof(*pd) + pm_size, GFP_KERNEL);
 507         if (!pd)
 508                 return -ENOMEM;
 509
 510         pd->np = np;
 511         pd->num_core_pm_clks = num_core_pm_clks;
 512         memcpy(pd->core_pm_clks, core_pm_clks, pm_size);
 513
 514         genpd = &pd->genpd;
 515         genpd->name = np->name;
 516         genpd->flags = GENPD_FLAG_PM_CLK | GENPD_FLAG_ACTIVE_WAKEUP;
 517         genpd->attach_dev = cpg_mssr_attach_dev;
 518         genpd->detach_dev = cpg_mssr_detach_dev;
 519         pm_genpd_init(genpd, &pm_domain_always_on_gov, false);
 520         cpg_mssr_clk_domain = pd;
 521
 522         of_genpd_add_provider_simple(np, genpd);
 523         return 0;
 524 }
 525
 526 #ifdef CONFIG_RESET_CONTROLLER
 527
 528 #define rcdev_to_priv(x)        container_of(x, struct cpg_mssr_priv, rcdev)
 529
 530 static int cpg_mssr_reset(struct reset_controller_dev *rcdev,
 531                           unsigned long id)
 532 {
 533         struct cpg_mssr_priv *priv = rcdev_to_priv(rcdev);
 534         unsigned int reg = id / 32;
 535         unsigned int bit = id % 32;
 536         u32 bitmask = BIT(bit);
 537         unsigned long flags;
 538         u32 value;
 539
 540         dev_dbg(priv->dev, "reset %u%02u\n", reg, bit);
 541
 542         /* Reset module */
 543         spin_lock_irqsave(&priv->rmw_lock, flags);
 544         value = readl(priv->base + SRCR(reg));
 545         value |= bitmask;
 546         writel(value, priv->base + SRCR(reg));
 547         spin_unlock_irqrestore(&priv->rmw_lock, flags);
 548
 549         /* Wait for at least one cycle of the RCLK clock (@ ca. 32 kHz) */
 550         udelay(35);
 551
 552         /* Release module from reset state */
 553         writel(bitmask, priv->base + SRSTCLR(reg));
 554
 555         return 0;
 556 }
 557
 558 static int cpg_mssr_assert(struct reset_controller_dev *rcdev, unsigned long id)
 559 {
 560         struct cpg_mssr_priv *priv = rcdev_to_priv(rcdev);
 561         unsigned int reg = id / 32;
 562         unsigned int bit = id % 32;
 563         u32 bitmask = BIT(bit);
 564         unsigned long flags;
 565         u32 value;
 566
 567         dev_dbg(priv->dev, "assert %u%02u\n", reg, bit);
 568
 569         spin_lock_irqsave(&priv->rmw_lock, flags);
 570         value = readl(priv->base + SRCR(reg));
 571         value |= bitmask;
 572         writel(value, priv->base + SRCR(reg));
 573         spin_unlock_irqrestore(&priv->rmw_lock, flags);
 574         return 0;
 575 }
 576
 577 static int cpg_mssr_deassert(struct reset_controller_dev *rcdev,
 578                              unsigned long id)
 579 {
 580         struct cpg_mssr_priv *priv = rcdev_to_priv(rcdev);
 581         unsigned int reg = id / 32;
 582         unsigned int bit = id % 32;
 583         u32 bitmask = BIT(bit);
 584
 585         dev_dbg(priv->dev, "deassert %u%02u\n", reg, bit);
 586
 587         writel(bitmask, priv->base + SRSTCLR(reg));
 588         return 0;
 589 }
 590
 591 static int cpg_mssr_status(struct reset_controller_dev *rcdev,
 592                            unsigned long id)
 593 {
 594         struct cpg_mssr_priv *priv = rcdev_to_priv(rcdev);
 595         unsigned int reg = id / 32;
 596         unsigned int bit = id % 32;
 597         u32 bitmask = BIT(bit);
 598
 599         return !!(readl(priv->base + SRCR(reg)) & bitmask);
 600 }
 601
 602 static const struct reset_control_ops cpg_mssr_reset_ops = {
 603         .reset = cpg_mssr_reset,
 604         .assert = cpg_mssr_assert,
 605         .deassert = cpg_mssr_deassert,
 606         .status = cpg_mssr_status,
 607 };
 608
 609 static int cpg_mssr_reset_xlate(struct reset_controller_dev *rcdev,
 610                                 const struct of_phandle_args *reset_spec)
 611 {
 612         struct cpg_mssr_priv *priv = rcdev_to_priv(rcdev);
 613         unsigned int unpacked = reset_spec->args[0];
 614         unsigned int idx = MOD_CLK_PACK(unpacked);
 615
 616         if (unpacked % 100 > 31 || idx >= rcdev->nr_resets) {
 617                 dev_err(priv->dev, "Invalid reset index %u\n", unpacked);
 618                 return -EINVAL;
 619         }
 620
 621         return idx;
 622 }
 623
 624 static int cpg_mssr_reset_controller_register(struct cpg_mssr_priv *priv)
 625 {
 626         priv->rcdev.ops = &cpg_mssr_reset_ops;
 627         priv->rcdev.of_node = priv->dev->of_node;
 628         priv->rcdev.of_reset_n_cells = 1;
 629         priv->rcdev.of_xlate = cpg_mssr_reset_xlate;
 630         priv->rcdev.nr_resets = priv->num_mod_clks;
 631         return devm_reset_controller_register(priv->dev, &priv->rcdev);
 632 }
 633
 634 #else /* !CONFIG_RESET_CONTROLLER */
 635 static inline int cpg_mssr_reset_controller_register(struct cpg_mssr_priv *priv)
 636 {
 637         return 0;
 638 }
 639 #endif /* !CONFIG_RESET_CONTROLLER */
 640
 641
 642 static const struct of_device_id cpg_mssr_match[] = {
 643 #ifdef CONFIG_CLK_R8A7743
 644         {
 645                 .compatible = "renesas,r8a7743-cpg-mssr",
 646                 .data = &r8a7743_cpg_mssr_info,
 647         },
 648 #endif
 649 #ifdef CONFIG_CLK_R8A7745
 650         {
 651                 .compatible = "renesas,r8a7745-cpg-mssr",
 652                 .data = &r8a7745_cpg_mssr_info,
 653         },
 654 #endif
 655 #ifdef CONFIG_CLK_R8A7790
 656         {
 657                 .compatible = "renesas,r8a7790-cpg-mssr",
 658                 .data = &r8a7790_cpg_mssr_info,
 659         },
 660 #endif
 661 #ifdef CONFIG_CLK_R8A7791
 662         {
 663                 .compatible = "renesas,r8a7791-cpg-mssr",
 664                 .data = &r8a7791_cpg_mssr_info,
 665         },
 666         /* R-Car M2-N is (almost) identical to R-Car M2-W w.r.t. clocks. */
 667         {
 668                 .compatible = "renesas,r8a7793-cpg-mssr",
 669                 .data = &r8a7791_cpg_mssr_info,
 670         },
 671 #endif
 672 #ifdef CONFIG_CLK_R8A7792
 673         {
 674                 .compatible = "renesas,r8a7792-cpg-mssr",
 675                 .data = &r8a7792_cpg_mssr_info,
 676         },
 677 #endif
 678 #ifdef CONFIG_CLK_R8A7794
 679         {
 680                 .compatible = "renesas,r8a7794-cpg-mssr",
 681                 .data = &r8a7794_cpg_mssr_info,
 682         },
 683 #endif
 684 #ifdef CONFIG_CLK_R8A7795
 685         {
 686                 .compatible = "renesas,r8a7795-cpg-mssr",
 687                 .data = &r8a7795_cpg_mssr_info,
 688         },
 689 #endif
 690 #ifdef CONFIG_CLK_R8A7796
 691         {
 692                 .compatible = "renesas,r8a7796-cpg-mssr",
 693                 .data = &r8a7796_cpg_mssr_info,
 694         },
 695 #endif
 696 #ifdef CONFIG_CLK_R8A77970
 697         {
 698                 .compatible = "renesas,r8a77970-cpg-mssr",
 699                 .data = &r8a77970_cpg_mssr_info,
 700         },
 701 #endif
 702 #ifdef CONFIG_CLK_R8A77995
 703         {
 704                 .compatible = "renesas,r8a77995-cpg-mssr",
 705                 .data = &r8a77995_cpg_mssr_info,
 706         },
 707 #endif
 708         { /* sentinel */ }
 709 };
 710
 711 static void cpg_mssr_del_clk_provider(void *data)
 712 {
 713         of_clk_del_provider(data);
 714 }
 715
 716 #if defined(CONFIG_PM_SLEEP) && defined(CONFIG_ARM_PSCI_FW)
 717 static int cpg_mssr_suspend_noirq(struct device *dev)
 718 {
 719         struct cpg_mssr_priv *priv = dev_get_drvdata(dev);
 720         unsigned int reg;
 721
 722         /* This is the best we can do to check for the presence of PSCI */
 723         if (!psci_ops.cpu_suspend)
 724                 return 0;
 725
 726         /* Save module registers with bits under our control */
 727         for (reg = 0; reg < ARRAY_SIZE(priv->smstpcr_saved); reg++) {
 728                 if (priv->smstpcr_saved[reg].mask)
 729                         priv->smstpcr_saved[reg].val =
 730                                 readl(priv->base + SMSTPCR(reg));
 731         }
 732
 733         /* Save core clocks */
 734         raw_notifier_call_chain(&priv->notifiers, PM_EVENT_SUSPEND, NULL);
 735
 736         return 0;
 737 }
 738
 739 static int cpg_mssr_resume_noirq(struct device *dev)
 740 {
 741         struct cpg_mssr_priv *priv = dev_get_drvdata(dev);
 742         unsigned int reg, i;
 743         u32 mask, oldval, newval;
 744
 745         /* This is the best we can do to check for the presence of PSCI */
 746         if (!psci_ops.cpu_suspend)
 747                 return 0;
 748
 749         /* Restore core clocks */
 750         raw_notifier_call_chain(&priv->notifiers, PM_EVENT_RESUME, NULL);
 751
 752         /* Restore module clocks */
 753         for (reg = 0; reg < ARRAY_SIZE(priv->smstpcr_saved); reg++) {
 754                 mask = priv->smstpcr_saved[reg].mask;
 755                 if (!mask)
 756                         continue;
 757
 758                 oldval = readl(priv->base + SMSTPCR(reg));
 759                 newval = oldval & ~mask;
 760                 newval |= priv->smstpcr_saved[reg].val & mask;
 761                 if (newval == oldval)
 762                         continue;
 763
 764                 writel(newval, priv->base + SMSTPCR(reg));
 765
 766                 /* Wait until enabled clocks are really enabled */
 767                 mask &= ~priv->smstpcr_saved[reg].val;
 768                 if (!mask)
 769                         continue;
 770
 771                 for (i = 1000; i > 0; --i) {
 772                         oldval = readl(priv->base + MSTPSR(reg));
 773                         if (!(oldval & mask))
 774                                 break;
 775                         cpu_relax();
 776                 }
 777
 778                 if (!i)
 779                         dev_warn(dev, "Failed to enable SMSTP %p[0x%x]\n",
 780                                  priv->base + SMSTPCR(reg), oldval & mask);
 781         }
 782
 783         return 0;
 784 }
 785
 786 static const struct dev_pm_ops cpg_mssr_pm = {
 787         SET_NOIRQ_SYSTEM_SLEEP_PM_OPS(cpg_mssr_suspend_noirq,
 788                                       cpg_mssr_resume_noirq)
 789 };
 790 #define DEV_PM_OPS      &cpg_mssr_pm
 791 #else
 792 #define DEV_PM_OPS      NULL
 793 #endif /* CONFIG_PM_SLEEP && CONFIG_ARM_PSCI_FW */
 794
 795 static int __init cpg_mssr_probe(struct platform_device *pdev)
 796 {
 797         struct device *dev = &pdev->dev;
 798         struct device_node *np = dev->of_node;
 799         const struct cpg_mssr_info *info;
 800         struct cpg_mssr_priv *priv;
 801         unsigned int nclks, i;
 802         struct resource *res;
 803         struct clk **clks;
 804         int error;
 805
 806         info = of_device_get_match_data(dev);
 807         if (info->init) {
 808                 error = info->init(dev);
 809                 if (error)
 810                         return error;
 811         }
 812
 813         priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
 814         if (!priv)
 815                 return -ENOMEM;
 816
 817         priv->dev = dev;
 818         spin_lock_init(&priv->rmw_lock);
 819
 820         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 821         priv->base = devm_ioremap_resource(dev, res);
 822         if (IS_ERR(priv->base))
 823                 return PTR_ERR(priv->base);
 824
 825         nclks = info->num_total_core_clks + info->num_hw_mod_clks;
 826         clks = devm_kmalloc_array(dev, nclks, sizeof(*clks), GFP_KERNEL);
 827         if (!clks)
 828                 return -ENOMEM;
 829
 830         dev_set_drvdata(dev, priv);
 831         priv->clks = clks;
 832         priv->num_core_clks = info->num_total_core_clks;
 833         priv->num_mod_clks = info->num_hw_mod_clks;
 834         priv->last_dt_core_clk = info->last_dt_core_clk;
 835         RAW_INIT_NOTIFIER_HEAD(&priv->notifiers);
 836
 837         for (i = 0; i < nclks; i++)
 838                 clks[i] = ERR_PTR(-ENOENT);
 839
 840         for (i = 0; i < info->num_core_clks; i++)
 841                 cpg_mssr_register_core_clk(&info->core_clks[i], info, priv);
 842
 843         for (i = 0; i < info->num_mod_clks; i++)
 844                 cpg_mssr_register_mod_clk(&info->mod_clks[i], info, priv);
 845
 846         error = of_clk_add_provider(np, cpg_mssr_clk_src_twocell_get, priv);
 847         if (error)
 848                 return error;
 849
 850         error = devm_add_action_or_reset(dev,
 851                                          cpg_mssr_del_clk_provider,
 852                                          np);
 853         if (error)
 854                 return error;
 855
 856         error = cpg_mssr_add_clk_domain(dev, info->core_pm_clks,
 857                                         info->num_core_pm_clks);
 858         if (error)
 859                 return error;
 860
 861         error = cpg_mssr_reset_controller_register(priv);
 862         if (error)
 863                 return error;
 864
 865         return 0;
 866 }
 867
 868 static struct platform_driver cpg_mssr_driver = {
 869         .driver         = {
 870                 .name   = "renesas-cpg-mssr",
 871                 .of_match_table = cpg_mssr_match,
 872                 .pm = DEV_PM_OPS,
 873         },
 874 };
 875
 876 static int __init cpg_mssr_init(void)
 877 {
 878         return platform_driver_probe(&cpg_mssr_driver, cpg_mssr_probe);
 879 }
 880
 881 subsys_initcall(cpg_mssr_init);
 882
 883 void __init cpg_core_nullify_range(struct cpg_core_clk *core_clks,
 884                                    unsigned int num_core_clks,
 885                                    unsigned int first_clk,
 886                                    unsigned int last_clk)
 887 {
 888         unsigned int i;
 889
 890         for (i = 0; i < num_core_clks; i++)
 891                 if (core_clks[i].id >= first_clk &&
 892                     core_clks[i].id <= last_clk)
 893                         core_clks[i].name = NULL;
 894 }
 895
 896 void __init mssr_mod_nullify(struct mssr_mod_clk *mod_clks,
 897                              unsigned int num_mod_clks,
 898                              const unsigned int *clks, unsigned int n)
 899 {
 900         unsigned int i, j;
 901
 902         for (i = 0, j = 0; i < num_mod_clks && j < n; i++)
 903                 if (mod_clks[i].id == clks[j]) {
 904                         mod_clks[i].name = NULL;
 905                         j++;
 906                 }
 907 }
 908
 909 void __init mssr_mod_reparent(struct mssr_mod_clk *mod_clks,
 910                               unsigned int num_mod_clks,
 911                               const struct mssr_mod_reparent *clks,
 912                               unsigned int n)
 913 {
 914         unsigned int i, j;
 915
 916         for (i = 0, j = 0; i < num_mod_clks && j < n; i++)
 917                 if (mod_clks[i].id == clks[j].clk) {
 918                         mod_clks[i].parent = clks[j].parent;
 919                         j++;
 920                 }
 921 }
 922
 923 MODULE_DESCRIPTION("Renesas CPG/MSSR Driver");
 924 MODULE_LICENSE("GPL v2");