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/reset-controller.h>
  30 #include <linux/slab.h>
  31
  32 #include <dt-bindings/clock/renesas-cpg-mssr.h>
  33
  34 #include "renesas-cpg-mssr.h"
  35 #include "clk-div6.h"
  36
  37 #ifdef DEBUG
  38 #define WARN_DEBUG(x)   WARN_ON(x)
  39 #else
  40 #define WARN_DEBUG(x)   do { } while (0)
  41 #endif
  42
  43
  44 /*
  45  * Module Standby and Software Reset register offets.
  46  *
  47  * If the registers exist, these are valid for SH-Mobile, R-Mobile,
  48  * R-Car Gen2, R-Car Gen3, and RZ/G1.
  49  * These are NOT valid for R-Car Gen1 and RZ/A1!
  50  */
  51
  52 /*
  53  * Module Stop Status Register offsets
  54  */
  55
  56 static const u16 mstpsr[] = {
  57         0x030, 0x038, 0x040, 0x048, 0x04C, 0x03C, 0x1C0, 0x1C4,
  58         0x9A0, 0x9A4, 0x9A8, 0x9AC,
  59 };
  60
  61 #define MSTPSR(i)       mstpsr[i]
  62
  63
  64 /*
  65  * System Module Stop Control Register offsets
  66  */
  67
  68 static const u16 smstpcr[] = {
  69         0x130, 0x134, 0x138, 0x13C, 0x140, 0x144, 0x148, 0x14C,
  70         0x990, 0x994, 0x998, 0x99C,
  71 };
  72
  73 #define SMSTPCR(i)      smstpcr[i]
  74
  75
  76 /*
  77  * Software Reset Register offsets
  78  */
  79
  80 static const u16 srcr[] = {
  81         0x0A0, 0x0A8, 0x0B0, 0x0B8, 0x0BC, 0x0C4, 0x1C8, 0x1CC,
  82         0x920, 0x924, 0x928, 0x92C,
  83 };
  84
  85 #define SRCR(i)         srcr[i]
  86
  87
  88 /* Realtime Module Stop Control Register offsets */
  89 #define RMSTPCR(i)      (smstpcr[i] - 0x20)
  90
  91 /* Modem Module Stop Control Register offsets (r8a73a4) */
  92 #define MMSTPCR(i)      (smstpcr[i] + 0x20)
  93
  94 /* Software Reset Clearing Register offsets */
  95 #define SRSTCLR(i)      (0x940 + (i) * 4)
  96
  97
  98 /**
  99  * Clock Pulse Generator / Module Standby and Software Reset Private Data
 100  *
 101  * @rcdev: Optional reset controller entity
 102  * @dev: CPG/MSSR device
 103  * @base: CPG/MSSR register block base address
 104  * @rmw_lock: protects RMW register accesses
 105  * @clks: Array containing all Core and Module Clocks
 106  * @num_core_clks: Number of Core Clocks in clks[]
 107  * @num_mod_clks: Number of Module Clocks in clks[]
 108  * @last_dt_core_clk: ID of the last Core Clock exported to DT
 109  */
 110 struct cpg_mssr_priv {
 111 #ifdef CONFIG_RESET_CONTROLLER
 112         struct reset_controller_dev rcdev;
 113 #endif
 114         struct device *dev;
 115         void __iomem *base;
 116         spinlock_t rmw_lock;
 117
 118         struct clk **clks;
 119         unsigned int num_core_clks;
 120         unsigned int num_mod_clks;
 121         unsigned int last_dt_core_clk;
 122 };
 123
 124
 125 /**
 126  * struct mstp_clock - MSTP gating clock
 127  * @hw: handle between common and hardware-specific interfaces
 128  * @index: MSTP clock number
 129  * @priv: CPG/MSSR private data
 130  */
 131 struct mstp_clock {
 132         struct clk_hw hw;
 133         u32 index;
 134         struct cpg_mssr_priv *priv;
 135 };
 136
 137 #define to_mstp_clock(_hw) container_of(_hw, struct mstp_clock, hw)
 138
 139 static int cpg_mstp_clock_endisable(struct clk_hw *hw, bool enable)
 140 {
 141         struct mstp_clock *clock = to_mstp_clock(hw);
 142         struct cpg_mssr_priv *priv = clock->priv;
 143         unsigned int reg = clock->index / 32;
 144         unsigned int bit = clock->index % 32;
 145         struct device *dev = priv->dev;
 146         u32 bitmask = BIT(bit);
 147         unsigned long flags;
 148         unsigned int i;
 149         u32 value;
 150
 151         dev_dbg(dev, "MSTP %u%02u/%pC %s\n", reg, bit, hw->clk,
 152                 enable ? "ON" : "OFF");
 153         spin_lock_irqsave(&priv->rmw_lock, flags);
 154
 155         value = readl(priv->base + SMSTPCR(reg));
 156         if (enable)
 157                 value &= ~bitmask;
 158         else
 159                 value |= bitmask;
 160         writel(value, priv->base + SMSTPCR(reg));
 161
 162         spin_unlock_irqrestore(&priv->rmw_lock, flags);
 163
 164         if (!enable)
 165                 return 0;
 166
 167         for (i = 1000; i > 0; --i) {
 168                 if (!(readl(priv->base + MSTPSR(reg)) & bitmask))
 169                         break;
 170                 cpu_relax();
 171         }
 172
 173         if (!i) {
 174                 dev_err(dev, "Failed to enable SMSTP %p[%d]\n",
 175                         priv->base + SMSTPCR(reg), bit);
 176                 return -ETIMEDOUT;
 177         }
 178
 179         return 0;
 180 }
 181
 182 static int cpg_mstp_clock_enable(struct clk_hw *hw)
 183 {
 184         return cpg_mstp_clock_endisable(hw, true);
 185 }
 186
 187 static void cpg_mstp_clock_disable(struct clk_hw *hw)
 188 {
 189         cpg_mstp_clock_endisable(hw, false);
 190 }
 191
 192 static int cpg_mstp_clock_is_enabled(struct clk_hw *hw)
 193 {
 194         struct mstp_clock *clock = to_mstp_clock(hw);
 195         struct cpg_mssr_priv *priv = clock->priv;
 196         u32 value;
 197
 198         value = readl(priv->base + MSTPSR(clock->index / 32));
 199
 200         return !(value & BIT(clock->index % 32));
 201 }
 202
 203 static const struct clk_ops cpg_mstp_clock_ops = {
 204         .enable = cpg_mstp_clock_enable,
 205         .disable = cpg_mstp_clock_disable,
 206         .is_enabled = cpg_mstp_clock_is_enabled,
 207 };
 208
 209 static
 210 struct clk *cpg_mssr_clk_src_twocell_get(struct of_phandle_args *clkspec,
 211                                          void *data)
 212 {
 213         unsigned int clkidx = clkspec->args[1];
 214         struct cpg_mssr_priv *priv = data;
 215         struct device *dev = priv->dev;
 216         unsigned int idx;
 217         const char *type;
 218         struct clk *clk;
 219
 220         switch (clkspec->args[0]) {
 221         case CPG_CORE:
 222                 type = "core";
 223                 if (clkidx > priv->last_dt_core_clk) {
 224                         dev_err(dev, "Invalid %s clock index %u\n", type,
 225                                clkidx);
 226                         return ERR_PTR(-EINVAL);
 227                 }
 228                 clk = priv->clks[clkidx];
 229                 break;
 230
 231         case CPG_MOD:
 232                 type = "module";
 233                 idx = MOD_CLK_PACK(clkidx);
 234                 if (clkidx % 100 > 31 || idx >= priv->num_mod_clks) {
 235                         dev_err(dev, "Invalid %s clock index %u\n", type,
 236                                 clkidx);
 237                         return ERR_PTR(-EINVAL);
 238                 }
 239                 clk = priv->clks[priv->num_core_clks + idx];
 240                 break;
 241
 242         default:
 243                 dev_err(dev, "Invalid CPG clock type %u\n", clkspec->args[0]);
 244                 return ERR_PTR(-EINVAL);
 245         }
 246
 247         if (IS_ERR(clk))
 248                 dev_err(dev, "Cannot get %s clock %u: %ld", type, clkidx,
 249                        PTR_ERR(clk));
 250         else
 251                 dev_dbg(dev, "clock (%u, %u) is %pC at %pCr Hz\n",
 252                         clkspec->args[0], clkspec->args[1], clk, clk);
 253         return clk;
 254 }
 255
 256 static void __init cpg_mssr_register_core_clk(const struct cpg_core_clk *core,
 257                                               const struct cpg_mssr_info *info,
 258                                               struct cpg_mssr_priv *priv)
 259 {
 260         struct clk *clk = NULL, *parent;
 261         struct device *dev = priv->dev;
 262         unsigned int id = core->id, div = core->div;
 263         const char *parent_name;
 264
 265         WARN_DEBUG(id >= priv->num_core_clks);
 266         WARN_DEBUG(PTR_ERR(priv->clks[id]) != -ENOENT);
 267
 268         if (!core->name) {
 269                 /* Skip NULLified clock */
 270                 return;
 271         }
 272
 273         switch (core->type) {
 274         case CLK_TYPE_IN:
 275                 clk = of_clk_get_by_name(priv->dev->of_node, core->name);
 276                 break;
 277
 278         case CLK_TYPE_FF:
 279         case CLK_TYPE_DIV6P1:
 280         case CLK_TYPE_DIV6_RO:
 281                 WARN_DEBUG(core->parent >= priv->num_core_clks);
 282                 parent = priv->clks[core->parent];
 283                 if (IS_ERR(parent)) {
 284                         clk = parent;
 285                         goto fail;
 286                 }
 287
 288                 parent_name = __clk_get_name(parent);
 289
 290                 if (core->type == CLK_TYPE_DIV6_RO)
 291                         /* Multiply with the DIV6 register value */
 292                         div *= (readl(priv->base + core->offset) & 0x3f) + 1;
 293
 294                 if (core->type == CLK_TYPE_DIV6P1) {
 295                         clk = cpg_div6_register(core->name, 1, &parent_name,
 296                                                 priv->base + core->offset);
 297                 } else {
 298                         clk = clk_register_fixed_factor(NULL, core->name,
 299                                                         parent_name, 0,
 300                                                         core->mult, div);
 301                 }
 302                 break;
 303
 304         default:
 305                 if (info->cpg_clk_register)
 306                         clk = info->cpg_clk_register(dev, core, info,
 307                                                      priv->clks, priv->base);
 308                 else
 309                         dev_err(dev, "%s has unsupported core clock type %u\n",
 310                                 core->name, core->type);
 311                 break;
 312         }
 313
 314         if (IS_ERR_OR_NULL(clk))
 315                 goto fail;
 316
 317         dev_dbg(dev, "Core clock %pC at %pCr Hz\n", clk, clk);
 318         priv->clks[id] = clk;
 319         return;
 320
 321 fail:
 322         dev_err(dev, "Failed to register %s clock %s: %ld\n", "core",
 323                 core->name, PTR_ERR(clk));
 324 }
 325
 326 static void __init cpg_mssr_register_mod_clk(const struct mssr_mod_clk *mod,
 327                                              const struct cpg_mssr_info *info,
 328                                              struct cpg_mssr_priv *priv)
 329 {
 330         struct mstp_clock *clock = NULL;
 331         struct device *dev = priv->dev;
 332         unsigned int id = mod->id;
 333         struct clk_init_data init;
 334         struct clk *parent, *clk;
 335         const char *parent_name;
 336         unsigned int i;
 337
 338         WARN_DEBUG(id < priv->num_core_clks);
 339         WARN_DEBUG(id >= priv->num_core_clks + priv->num_mod_clks);
 340         WARN_DEBUG(mod->parent >= priv->num_core_clks + priv->num_mod_clks);
 341         WARN_DEBUG(PTR_ERR(priv->clks[id]) != -ENOENT);
 342
 343         if (!mod->name) {
 344                 /* Skip NULLified clock */
 345                 return;
 346         }
 347
 348         parent = priv->clks[mod->parent];
 349         if (IS_ERR(parent)) {
 350                 clk = parent;
 351                 goto fail;
 352         }
 353
 354         clock = kzalloc(sizeof(*clock), GFP_KERNEL);
 355         if (!clock) {
 356                 clk = ERR_PTR(-ENOMEM);
 357                 goto fail;
 358         }
 359
 360         init.name = mod->name;
 361         init.ops = &cpg_mstp_clock_ops;
 362         init.flags = CLK_IS_BASIC | CLK_SET_RATE_PARENT;
 363         for (i = 0; i < info->num_crit_mod_clks; i++)
 364                 if (id == info->crit_mod_clks[i]) {
 365                         dev_dbg(dev, "MSTP %s setting CLK_IS_CRITICAL\n",
 366                                 mod->name);
 367                         init.flags |= CLK_IS_CRITICAL;
 368                         break;
 369                 }
 370
 371         parent_name = __clk_get_name(parent);
 372         init.parent_names = &parent_name;
 373         init.num_parents = 1;
 374
 375         clock->index = id - priv->num_core_clks;
 376         clock->priv = priv;
 377         clock->hw.init = &init;
 378
 379         clk = clk_register(NULL, &clock->hw);
 380         if (IS_ERR(clk))
 381                 goto fail;
 382
 383         dev_dbg(dev, "Module clock %pC at %pCr Hz\n", clk, clk);
 384         priv->clks[id] = clk;
 385         return;
 386
 387 fail:
 388         dev_err(dev, "Failed to register %s clock %s: %ld\n", "module",
 389                 mod->name, PTR_ERR(clk));
 390         kfree(clock);
 391 }
 392
 393 struct cpg_mssr_clk_domain {
 394         struct generic_pm_domain genpd;
 395         struct device_node *np;
 396         unsigned int num_core_pm_clks;
 397         unsigned int core_pm_clks[0];
 398 };
 399
 400 static struct cpg_mssr_clk_domain *cpg_mssr_clk_domain;
 401
 402 static bool cpg_mssr_is_pm_clk(const struct of_phandle_args *clkspec,
 403                                struct cpg_mssr_clk_domain *pd)
 404 {
 405         unsigned int i;
 406
 407         if (clkspec->np != pd->np || clkspec->args_count != 2)
 408                 return false;
 409
 410         switch (clkspec->args[0]) {
 411         case CPG_CORE:
 412                 for (i = 0; i < pd->num_core_pm_clks; i++)
 413                         if (clkspec->args[1] == pd->core_pm_clks[i])
 414                                 return true;
 415                 return false;
 416
 417         case CPG_MOD:
 418                 return true;
 419
 420         default:
 421                 return false;
 422         }
 423 }
 424
 425 int cpg_mssr_attach_dev(struct generic_pm_domain *unused, struct device *dev)
 426 {
 427         struct cpg_mssr_clk_domain *pd = cpg_mssr_clk_domain;
 428         struct device_node *np = dev->of_node;
 429         struct of_phandle_args clkspec;
 430         struct clk *clk;
 431         int i = 0;
 432         int error;
 433
 434         if (!pd) {
 435                 dev_dbg(dev, "CPG/MSSR clock domain not yet available\n");
 436                 return -EPROBE_DEFER;
 437         }
 438
 439         while (!of_parse_phandle_with_args(np, "clocks", "#clock-cells", i,
 440                                            &clkspec)) {
 441                 if (cpg_mssr_is_pm_clk(&clkspec, pd))
 442                         goto found;
 443
 444                 of_node_put(clkspec.np);
 445                 i++;
 446         }
 447
 448         return 0;
 449
 450 found:
 451         clk = of_clk_get_from_provider(&clkspec);
 452         of_node_put(clkspec.np);
 453
 454         if (IS_ERR(clk))
 455                 return PTR_ERR(clk);
 456
 457         error = pm_clk_create(dev);
 458         if (error) {
 459                 dev_err(dev, "pm_clk_create failed %d\n", error);
 460                 goto fail_put;
 461         }
 462
 463         error = pm_clk_add_clk(dev, clk);
 464         if (error) {
 465                 dev_err(dev, "pm_clk_add_clk %pC failed %d\n", clk, error);
 466                 goto fail_destroy;
 467         }
 468
 469         return 0;
 470
 471 fail_destroy:
 472         pm_clk_destroy(dev);
 473 fail_put:
 474         clk_put(clk);
 475         return error;
 476 }
 477
 478 void cpg_mssr_detach_dev(struct generic_pm_domain *unused, struct device *dev)
 479 {
 480         if (!list_empty(&dev->power.subsys_data->clock_list))
 481                 pm_clk_destroy(dev);
 482 }
 483
 484 static int __init cpg_mssr_add_clk_domain(struct device *dev,
 485                                           const unsigned int *core_pm_clks,
 486                                           unsigned int num_core_pm_clks)
 487 {
 488         struct device_node *np = dev->of_node;
 489         struct generic_pm_domain *genpd;
 490         struct cpg_mssr_clk_domain *pd;
 491         size_t pm_size = num_core_pm_clks * sizeof(core_pm_clks[0]);
 492
 493         pd = devm_kzalloc(dev, sizeof(*pd) + pm_size, GFP_KERNEL);
 494         if (!pd)
 495                 return -ENOMEM;
 496
 497         pd->np = np;
 498         pd->num_core_pm_clks = num_core_pm_clks;
 499         memcpy(pd->core_pm_clks, core_pm_clks, pm_size);
 500
 501         genpd = &pd->genpd;
 502         genpd->name = np->name;
 503         genpd->flags = GENPD_FLAG_PM_CLK;
 504         genpd->attach_dev = cpg_mssr_attach_dev;
 505         genpd->detach_dev = cpg_mssr_detach_dev;
 506         pm_genpd_init(genpd, &pm_domain_always_on_gov, false);
 507         cpg_mssr_clk_domain = pd;
 508
 509         of_genpd_add_provider_simple(np, genpd);
 510         return 0;
 511 }
 512
 513 #ifdef CONFIG_RESET_CONTROLLER
 514
 515 #define rcdev_to_priv(x)        container_of(x, struct cpg_mssr_priv, rcdev)
 516
 517 static int cpg_mssr_reset(struct reset_controller_dev *rcdev,
 518                           unsigned long id)
 519 {
 520         struct cpg_mssr_priv *priv = rcdev_to_priv(rcdev);
 521         unsigned int reg = id / 32;
 522         unsigned int bit = id % 32;
 523         u32 bitmask = BIT(bit);
 524         unsigned long flags;
 525         u32 value;
 526
 527         dev_dbg(priv->dev, "reset %u%02u\n", reg, bit);
 528
 529         /* Reset module */
 530         spin_lock_irqsave(&priv->rmw_lock, flags);
 531         value = readl(priv->base + SRCR(reg));
 532         value |= bitmask;
 533         writel(value, priv->base + SRCR(reg));
 534         spin_unlock_irqrestore(&priv->rmw_lock, flags);
 535
 536         /* Wait for at least one cycle of the RCLK clock (@ ca. 32 kHz) */
 537         udelay(35);
 538
 539         /* Release module from reset state */
 540         writel(bitmask, priv->base + SRSTCLR(reg));
 541
 542         return 0;
 543 }
 544
 545 static int cpg_mssr_assert(struct reset_controller_dev *rcdev, unsigned long id)
 546 {
 547         struct cpg_mssr_priv *priv = rcdev_to_priv(rcdev);
 548         unsigned int reg = id / 32;
 549         unsigned int bit = id % 32;
 550         u32 bitmask = BIT(bit);
 551         unsigned long flags;
 552         u32 value;
 553
 554         dev_dbg(priv->dev, "assert %u%02u\n", reg, bit);
 555
 556         spin_lock_irqsave(&priv->rmw_lock, flags);
 557         value = readl(priv->base + SRCR(reg));
 558         value |= bitmask;
 559         writel(value, priv->base + SRCR(reg));
 560         spin_unlock_irqrestore(&priv->rmw_lock, flags);
 561         return 0;
 562 }
 563
 564 static int cpg_mssr_deassert(struct reset_controller_dev *rcdev,
 565                              unsigned long id)
 566 {
 567         struct cpg_mssr_priv *priv = rcdev_to_priv(rcdev);
 568         unsigned int reg = id / 32;
 569         unsigned int bit = id % 32;
 570         u32 bitmask = BIT(bit);
 571
 572         dev_dbg(priv->dev, "deassert %u%02u\n", reg, bit);
 573
 574         writel(bitmask, priv->base + SRSTCLR(reg));
 575         return 0;
 576 }
 577
 578 static int cpg_mssr_status(struct reset_controller_dev *rcdev,
 579                            unsigned long id)
 580 {
 581         struct cpg_mssr_priv *priv = rcdev_to_priv(rcdev);
 582         unsigned int reg = id / 32;
 583         unsigned int bit = id % 32;
 584         u32 bitmask = BIT(bit);
 585
 586         return !!(readl(priv->base + SRCR(reg)) & bitmask);
 587 }
 588
 589 static const struct reset_control_ops cpg_mssr_reset_ops = {
 590         .reset = cpg_mssr_reset,
 591         .assert = cpg_mssr_assert,
 592         .deassert = cpg_mssr_deassert,
 593         .status = cpg_mssr_status,
 594 };
 595
 596 static int cpg_mssr_reset_xlate(struct reset_controller_dev *rcdev,
 597                                 const struct of_phandle_args *reset_spec)
 598 {
 599         struct cpg_mssr_priv *priv = rcdev_to_priv(rcdev);
 600         unsigned int unpacked = reset_spec->args[0];
 601         unsigned int idx = MOD_CLK_PACK(unpacked);
 602
 603         if (unpacked % 100 > 31 || idx >= rcdev->nr_resets) {
 604                 dev_err(priv->dev, "Invalid reset index %u\n", unpacked);
 605                 return -EINVAL;
 606         }
 607
 608         return idx;
 609 }
 610
 611 static int cpg_mssr_reset_controller_register(struct cpg_mssr_priv *priv)
 612 {
 613         priv->rcdev.ops = &cpg_mssr_reset_ops;
 614         priv->rcdev.of_node = priv->dev->of_node;
 615         priv->rcdev.of_reset_n_cells = 1;
 616         priv->rcdev.of_xlate = cpg_mssr_reset_xlate;
 617         priv->rcdev.nr_resets = priv->num_mod_clks;
 618         return devm_reset_controller_register(priv->dev, &priv->rcdev);
 619 }
 620
 621 #else /* !CONFIG_RESET_CONTROLLER */
 622 static inline int cpg_mssr_reset_controller_register(struct cpg_mssr_priv *priv)
 623 {
 624         return 0;
 625 }
 626 #endif /* !CONFIG_RESET_CONTROLLER */
 627
 628
 629 static const struct of_device_id cpg_mssr_match[] = {
 630 #ifdef CONFIG_ARCH_R8A7743
 631         {
 632                 .compatible = "renesas,r8a7743-cpg-mssr",
 633                 .data = &r8a7743_cpg_mssr_info,
 634         },
 635 #endif
 636 #ifdef CONFIG_ARCH_R8A7745
 637         {
 638                 .compatible = "renesas,r8a7745-cpg-mssr",
 639                 .data = &r8a7745_cpg_mssr_info,
 640         },
 641 #endif
 642 #ifdef CONFIG_ARCH_R8A7795
 643         {
 644                 .compatible = "renesas,r8a7795-cpg-mssr",
 645                 .data = &r8a7795_cpg_mssr_info,
 646         },
 647 #endif
 648 #ifdef CONFIG_ARCH_R8A7796
 649         {
 650                 .compatible = "renesas,r8a7796-cpg-mssr",
 651                 .data = &r8a7796_cpg_mssr_info,
 652         },
 653 #endif
 654         { /* sentinel */ }
 655 };
 656
 657 static void cpg_mssr_del_clk_provider(void *data)
 658 {
 659         of_clk_del_provider(data);
 660 }
 661
 662 static int __init cpg_mssr_probe(struct platform_device *pdev)
 663 {
 664         struct device *dev = &pdev->dev;
 665         struct device_node *np = dev->of_node;
 666         const struct cpg_mssr_info *info;
 667         struct cpg_mssr_priv *priv;
 668         unsigned int nclks, i;
 669         struct resource *res;
 670         struct clk **clks;
 671         int error;
 672
 673         info = of_match_node(cpg_mssr_match, np)->data;
 674         if (info->init) {
 675                 error = info->init(dev);
 676                 if (error)
 677                         return error;
 678         }
 679
 680         priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
 681         if (!priv)
 682                 return -ENOMEM;
 683
 684         priv->dev = dev;
 685         spin_lock_init(&priv->rmw_lock);
 686
 687         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 688         priv->base = devm_ioremap_resource(dev, res);
 689         if (IS_ERR(priv->base))
 690                 return PTR_ERR(priv->base);
 691
 692         nclks = info->num_total_core_clks + info->num_hw_mod_clks;
 693         clks = devm_kmalloc_array(dev, nclks, sizeof(*clks), GFP_KERNEL);
 694         if (!clks)
 695                 return -ENOMEM;
 696
 697         priv->clks = clks;
 698         priv->num_core_clks = info->num_total_core_clks;
 699         priv->num_mod_clks = info->num_hw_mod_clks;
 700         priv->last_dt_core_clk = info->last_dt_core_clk;
 701
 702         for (i = 0; i < nclks; i++)
 703                 clks[i] = ERR_PTR(-ENOENT);
 704
 705         for (i = 0; i < info->num_core_clks; i++)
 706                 cpg_mssr_register_core_clk(&info->core_clks[i], info, priv);
 707
 708         for (i = 0; i < info->num_mod_clks; i++)
 709                 cpg_mssr_register_mod_clk(&info->mod_clks[i], info, priv);
 710
 711         error = of_clk_add_provider(np, cpg_mssr_clk_src_twocell_get, priv);
 712         if (error)
 713                 return error;
 714
 715         error = devm_add_action_or_reset(dev,
 716                                          cpg_mssr_del_clk_provider,
 717                                          np);
 718         if (error)
 719                 return error;
 720
 721         error = cpg_mssr_add_clk_domain(dev, info->core_pm_clks,
 722                                         info->num_core_pm_clks);
 723         if (error)
 724                 return error;
 725
 726         error = cpg_mssr_reset_controller_register(priv);
 727         if (error)
 728                 return error;
 729
 730         return 0;
 731 }
 732
 733 static struct platform_driver cpg_mssr_driver = {
 734         .driver         = {
 735                 .name   = "renesas-cpg-mssr",
 736                 .of_match_table = cpg_mssr_match,
 737         },
 738 };
 739
 740 static int __init cpg_mssr_init(void)
 741 {
 742         return platform_driver_probe(&cpg_mssr_driver, cpg_mssr_probe);
 743 }
 744
 745 subsys_initcall(cpg_mssr_init);
 746
 747 void __init cpg_core_nullify_range(struct cpg_core_clk *core_clks,
 748                                    unsigned int num_core_clks,
 749                                    unsigned int first_clk,
 750                                    unsigned int last_clk)
 751 {
 752         unsigned int i;
 753
 754         for (i = 0; i < num_core_clks; i++)
 755                 if (core_clks[i].id >= first_clk &&
 756                     core_clks[i].id <= last_clk)
 757                         core_clks[i].name = NULL;
 758 }
 759
 760 void __init mssr_mod_nullify(struct mssr_mod_clk *mod_clks,
 761                              unsigned int num_mod_clks,
 762                              const unsigned int *clks, unsigned int n)
 763 {
 764         unsigned int i, j;
 765
 766         for (i = 0, j = 0; i < num_mod_clks && j < n; i++)
 767                 if (mod_clks[i].id == clks[j]) {
 768                         mod_clks[i].name = NULL;
 769                         j++;
 770                 }
 771 }
 772
 773 void __init mssr_mod_reparent(struct mssr_mod_clk *mod_clks,
 774                               unsigned int num_mod_clks,
 775                               const struct mssr_mod_reparent *clks,
 776                               unsigned int n)
 777 {
 778         unsigned int i, j;
 779
 780         for (i = 0, j = 0; i < num_mod_clks && j < n; i++)
 781                 if (mod_clks[i].id == clks[j].clk) {
 782                         mod_clks[i].parent = clks[j].parent;
 783                         j++;
 784                 }
 785 }
 786
 787 MODULE_DESCRIPTION("Renesas CPG/MSSR Driver");
 788 MODULE_LICENSE("GPL v2");