arch/arm/mach-exynos/suspend.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 //
   3 // Copyright (c) 2011-2014 Samsung Electronics Co., Ltd.
   4 //              http://www.samsung.com
   5 //
   6 // EXYNOS - Suspend support
   7 //
   8 // Based on arch/arm/mach-s3c2410/pm.c
   9 // Copyright (c) 2006 Simtec Electronics
  10 //      Ben Dooks <ben@simtec.co.uk>
  11
  12 #include <linux/init.h>
  13 #include <linux/suspend.h>
  14 #include <linux/syscore_ops.h>
  15 #include <linux/cpu_pm.h>
  16 #include <linux/io.h>
  17 #include <linux/irq.h>
  18 #include <linux/irqchip.h>
  19 #include <linux/irqdomain.h>
  20 #include <linux/of_address.h>
  21 #include <linux/err.h>
  22 #include <linux/regulator/machine.h>
  23 #include <linux/soc/samsung/exynos-pmu.h>
  24 #include <linux/soc/samsung/exynos-regs-pmu.h>
  25
  26 #include <asm/cacheflush.h>
  27 #include <asm/hardware/cache-l2x0.h>
  28 #include <asm/firmware.h>
  29 #include <asm/mcpm.h>
  30 #include <asm/smp_scu.h>
  31 #include <asm/suspend.h>
  32
  33 #include <plat/pm-common.h>
  34
  35 #include "common.h"
  36
  37 #define REG_TABLE_END (-1U)
  38
  39 #define EXYNOS5420_CPU_STATE    0x28
  40
  41 /**
  42  * struct exynos_wkup_irq - PMU IRQ to mask mapping
  43  * @hwirq: Hardware IRQ signal of the PMU
  44  * @mask: Mask in PMU wake-up mask register
  45  */
  46 struct exynos_wkup_irq {
  47         unsigned int hwirq;
  48         u32 mask;
  49 };
  50
  51 struct exynos_pm_data {
  52         const struct exynos_wkup_irq *wkup_irq;
  53         unsigned int wake_disable_mask;
  54
  55         void (*pm_prepare)(void);
  56         void (*pm_resume_prepare)(void);
  57         void (*pm_resume)(void);
  58         int (*pm_suspend)(void);
  59         int (*cpu_suspend)(unsigned long);
  60 };
  61
  62 static const struct exynos_pm_data *pm_data __ro_after_init;
  63
  64 static int exynos5420_cpu_state;
  65 static unsigned int exynos_pmu_spare3;
  66
  67 /*
  68  * GIC wake-up support
  69  */
  70
  71 static u32 exynos_irqwake_intmask = 0xffffffff;
  72
  73 static const struct exynos_wkup_irq exynos3250_wkup_irq[] = {
  74         { 73, BIT(1) }, /* RTC alarm */
  75         { 74, BIT(2) }, /* RTC tick */
  76         { /* sentinel */ },
  77 };
  78
  79 static const struct exynos_wkup_irq exynos4_wkup_irq[] = {
  80         { 44, BIT(1) }, /* RTC alarm */
  81         { 45, BIT(2) }, /* RTC tick */
  82         { /* sentinel */ },
  83 };
  84
  85 static const struct exynos_wkup_irq exynos5250_wkup_irq[] = {
  86         { 43, BIT(1) }, /* RTC alarm */
  87         { 44, BIT(2) }, /* RTC tick */
  88         { /* sentinel */ },
  89 };
  90
  91 static int exynos_irq_set_wake(struct irq_data *data, unsigned int state)
  92 {
  93         const struct exynos_wkup_irq *wkup_irq;
  94
  95         if (!pm_data->wkup_irq)
  96                 return -ENOENT;
  97         wkup_irq = pm_data->wkup_irq;
  98
  99         while (wkup_irq->mask) {
 100                 if (wkup_irq->hwirq == data->hwirq) {
 101                         if (!state)
 102                                 exynos_irqwake_intmask |= wkup_irq->mask;
 103                         else
 104                                 exynos_irqwake_intmask &= ~wkup_irq->mask;
 105                         return 0;
 106                 }
 107                 ++wkup_irq;
 108         }
 109
 110         return -ENOENT;
 111 }
 112
 113 static struct irq_chip exynos_pmu_chip = {
 114         .name                   = "PMU",
 115         .irq_eoi                = irq_chip_eoi_parent,
 116         .irq_mask               = irq_chip_mask_parent,
 117         .irq_unmask             = irq_chip_unmask_parent,
 118         .irq_retrigger          = irq_chip_retrigger_hierarchy,
 119         .irq_set_wake           = exynos_irq_set_wake,
 120 #ifdef CONFIG_SMP
 121         .irq_set_affinity       = irq_chip_set_affinity_parent,
 122 #endif
 123 };
 124
 125 static int exynos_pmu_domain_translate(struct irq_domain *d,
 126                                        struct irq_fwspec *fwspec,
 127                                        unsigned long *hwirq,
 128                                        unsigned int *type)
 129 {
 130         if (is_of_node(fwspec->fwnode)) {
 131                 if (fwspec->param_count != 3)
 132                         return -EINVAL;
 133
 134                 /* No PPI should point to this domain */
 135                 if (fwspec->param[0] != 0)
 136                         return -EINVAL;
 137
 138                 *hwirq = fwspec->param[1];
 139                 *type = fwspec->param[2];
 140                 return 0;
 141         }
 142
 143         return -EINVAL;
 144 }
 145
 146 static int exynos_pmu_domain_alloc(struct irq_domain *domain,
 147                                    unsigned int virq,
 148                                    unsigned int nr_irqs, void *data)
 149 {
 150         struct irq_fwspec *fwspec = data;
 151         struct irq_fwspec parent_fwspec;
 152         irq_hw_number_t hwirq;
 153         int i;
 154
 155         if (fwspec->param_count != 3)
 156                 return -EINVAL; /* Not GIC compliant */
 157         if (fwspec->param[0] != 0)
 158                 return -EINVAL; /* No PPI should point to this domain */
 159
 160         hwirq = fwspec->param[1];
 161
 162         for (i = 0; i < nr_irqs; i++)
 163                 irq_domain_set_hwirq_and_chip(domain, virq + i, hwirq + i,
 164                                               &exynos_pmu_chip, NULL);
 165
 166         parent_fwspec = *fwspec;
 167         parent_fwspec.fwnode = domain->parent->fwnode;
 168         return irq_domain_alloc_irqs_parent(domain, virq, nr_irqs,
 169                                             &parent_fwspec);
 170 }
 171
 172 static const struct irq_domain_ops exynos_pmu_domain_ops = {
 173         .translate      = exynos_pmu_domain_translate,
 174         .alloc          = exynos_pmu_domain_alloc,
 175         .free           = irq_domain_free_irqs_common,
 176 };
 177
 178 static int __init exynos_pmu_irq_init(struct device_node *node,
 179                                       struct device_node *parent)
 180 {
 181         struct irq_domain *parent_domain, *domain;
 182
 183         if (!parent) {
 184                 pr_err("%pOF: no parent, giving up\n", node);
 185                 return -ENODEV;
 186         }
 187
 188         parent_domain = irq_find_host(parent);
 189         if (!parent_domain) {
 190                 pr_err("%pOF: unable to obtain parent domain\n", node);
 191                 return -ENXIO;
 192         }
 193
 194         pmu_base_addr = of_iomap(node, 0);
 195
 196         if (!pmu_base_addr) {
 197                 pr_err("%pOF: failed to find exynos pmu register\n", node);
 198                 return -ENOMEM;
 199         }
 200
 201         domain = irq_domain_add_hierarchy(parent_domain, 0, 0,
 202                                           node, &exynos_pmu_domain_ops,
 203                                           NULL);
 204         if (!domain) {
 205                 iounmap(pmu_base_addr);
 206                 pmu_base_addr = NULL;
 207                 return -ENOMEM;
 208         }
 209
 210         /*
 211          * Clear the OF_POPULATED flag set in of_irq_init so that
 212          * later the Exynos PMU platform device won't be skipped.
 213          */
 214         of_node_clear_flag(node, OF_POPULATED);
 215
 216         return 0;
 217 }
 218
 219 #define EXYNOS_PMU_IRQ(symbol, name)    IRQCHIP_DECLARE(symbol, name, exynos_pmu_irq_init)
 220
 221 EXYNOS_PMU_IRQ(exynos3250_pmu_irq, "samsung,exynos3250-pmu");
 222 EXYNOS_PMU_IRQ(exynos4210_pmu_irq, "samsung,exynos4210-pmu");
 223 EXYNOS_PMU_IRQ(exynos4412_pmu_irq, "samsung,exynos4412-pmu");
 224 EXYNOS_PMU_IRQ(exynos5250_pmu_irq, "samsung,exynos5250-pmu");
 225 EXYNOS_PMU_IRQ(exynos5420_pmu_irq, "samsung,exynos5420-pmu");
 226
 227 static int exynos_cpu_do_idle(void)
 228 {
 229         /* issue the standby signal into the pm unit. */
 230         cpu_do_idle();
 231
 232         pr_info("Failed to suspend the system\n");
 233         return 1; /* Aborting suspend */
 234 }
 235 static void exynos_flush_cache_all(void)
 236 {
 237         flush_cache_all();
 238         outer_flush_all();
 239 }
 240
 241 static int exynos_cpu_suspend(unsigned long arg)
 242 {
 243         exynos_flush_cache_all();
 244         return exynos_cpu_do_idle();
 245 }
 246
 247 static int exynos3250_cpu_suspend(unsigned long arg)
 248 {
 249         flush_cache_all();
 250         return exynos_cpu_do_idle();
 251 }
 252
 253 static int exynos5420_cpu_suspend(unsigned long arg)
 254 {
 255         /* MCPM works with HW CPU identifiers */
 256         unsigned int mpidr = read_cpuid_mpidr();
 257         unsigned int cluster = MPIDR_AFFINITY_LEVEL(mpidr, 1);
 258         unsigned int cpu = MPIDR_AFFINITY_LEVEL(mpidr, 0);
 259
 260         writel_relaxed(0x0, sysram_base_addr + EXYNOS5420_CPU_STATE);
 261
 262         if (IS_ENABLED(CONFIG_EXYNOS5420_MCPM)) {
 263                 mcpm_set_entry_vector(cpu, cluster, exynos_cpu_resume);
 264                 mcpm_cpu_suspend();
 265         }
 266
 267         pr_info("Failed to suspend the system\n");
 268
 269         /* return value != 0 means failure */
 270         return 1;
 271 }
 272
 273 static void exynos_pm_set_wakeup_mask(void)
 274 {
 275         /* Set wake-up mask registers */
 276         pmu_raw_writel(exynos_get_eint_wake_mask(), EXYNOS_EINT_WAKEUP_MASK);
 277         pmu_raw_writel(exynos_irqwake_intmask & ~(1 << 31), S5P_WAKEUP_MASK);
 278 }
 279
 280 static void exynos_pm_enter_sleep_mode(void)
 281 {
 282         /* Set value of power down register for sleep mode */
 283         exynos_sys_powerdown_conf(SYS_SLEEP);
 284         pmu_raw_writel(EXYNOS_SLEEP_MAGIC, S5P_INFORM1);
 285 }
 286
 287 static void exynos_pm_prepare(void)
 288 {
 289         exynos_set_delayed_reset_assertion(false);
 290
 291         /* Set wake-up mask registers */
 292         exynos_pm_set_wakeup_mask();
 293
 294         exynos_pm_enter_sleep_mode();
 295
 296         /* ensure at least INFORM0 has the resume address */
 297         pmu_raw_writel(__pa_symbol(exynos_cpu_resume), S5P_INFORM0);
 298 }
 299
 300 static void exynos3250_pm_prepare(void)
 301 {
 302         unsigned int tmp;
 303
 304         /* Set wake-up mask registers */
 305         exynos_pm_set_wakeup_mask();
 306
 307         tmp = pmu_raw_readl(EXYNOS3_ARM_L2_OPTION);
 308         tmp &= ~EXYNOS5_OPTION_USE_RETENTION;
 309         pmu_raw_writel(tmp, EXYNOS3_ARM_L2_OPTION);
 310
 311         exynos_pm_enter_sleep_mode();
 312
 313         /* ensure at least INFORM0 has the resume address */
 314         pmu_raw_writel(__pa_symbol(exynos_cpu_resume), S5P_INFORM0);
 315 }
 316
 317 static void exynos5420_pm_prepare(void)
 318 {
 319         unsigned int tmp;
 320
 321         /* Set wake-up mask registers */
 322         exynos_pm_set_wakeup_mask();
 323
 324         exynos_pmu_spare3 = pmu_raw_readl(S5P_PMU_SPARE3);
 325         /*
 326          * The cpu state needs to be saved and restored so that the
 327          * secondary CPUs will enter low power start. Though the U-Boot
 328          * is setting the cpu state with low power flag, the kernel
 329          * needs to restore it back in case, the primary cpu fails to
 330          * suspend for any reason.
 331          */
 332         exynos5420_cpu_state = readl_relaxed(sysram_base_addr +
 333                                              EXYNOS5420_CPU_STATE);
 334
 335         exynos_pm_enter_sleep_mode();
 336
 337         /* ensure at least INFORM0 has the resume address */
 338         if (IS_ENABLED(CONFIG_EXYNOS5420_MCPM))
 339                 pmu_raw_writel(__pa_symbol(mcpm_entry_point), S5P_INFORM0);
 340
 341         tmp = pmu_raw_readl(EXYNOS_L2_OPTION(0));
 342         tmp &= ~EXYNOS_L2_USE_RETENTION;
 343         pmu_raw_writel(tmp, EXYNOS_L2_OPTION(0));
 344
 345         tmp = pmu_raw_readl(EXYNOS5420_SFR_AXI_CGDIS1);
 346         tmp |= EXYNOS5420_UFS;
 347         pmu_raw_writel(tmp, EXYNOS5420_SFR_AXI_CGDIS1);
 348
 349         tmp = pmu_raw_readl(EXYNOS5420_ARM_COMMON_OPTION);
 350         tmp &= ~EXYNOS5420_L2RSTDISABLE_VALUE;
 351         pmu_raw_writel(tmp, EXYNOS5420_ARM_COMMON_OPTION);
 352
 353         tmp = pmu_raw_readl(EXYNOS5420_FSYS2_OPTION);
 354         tmp |= EXYNOS5420_EMULATION;
 355         pmu_raw_writel(tmp, EXYNOS5420_FSYS2_OPTION);
 356
 357         tmp = pmu_raw_readl(EXYNOS5420_PSGEN_OPTION);
 358         tmp |= EXYNOS5420_EMULATION;
 359         pmu_raw_writel(tmp, EXYNOS5420_PSGEN_OPTION);
 360 }
 361
 362
 363 static int exynos_pm_suspend(void)
 364 {
 365         exynos_pm_central_suspend();
 366
 367         /* Setting SEQ_OPTION register */
 368         pmu_raw_writel(S5P_USE_STANDBY_WFI0 | S5P_USE_STANDBY_WFE0,
 369                        S5P_CENTRAL_SEQ_OPTION);
 370
 371         if (read_cpuid_part() == ARM_CPU_PART_CORTEX_A9)
 372                 exynos_cpu_save_register();
 373
 374         return 0;
 375 }
 376
 377 static int exynos5420_pm_suspend(void)
 378 {
 379         u32 this_cluster;
 380
 381         exynos_pm_central_suspend();
 382
 383         /* Setting SEQ_OPTION register */
 384
 385         this_cluster = MPIDR_AFFINITY_LEVEL(read_cpuid_mpidr(), 1);
 386         if (!this_cluster)
 387                 pmu_raw_writel(EXYNOS5420_ARM_USE_STANDBY_WFI0,
 388                                 S5P_CENTRAL_SEQ_OPTION);
 389         else
 390                 pmu_raw_writel(EXYNOS5420_KFC_USE_STANDBY_WFI0,
 391                                 S5P_CENTRAL_SEQ_OPTION);
 392         return 0;
 393 }
 394
 395 static void exynos_pm_resume(void)
 396 {
 397         u32 cpuid = read_cpuid_part();
 398
 399         if (exynos_pm_central_resume())
 400                 goto early_wakeup;
 401
 402         if (cpuid == ARM_CPU_PART_CORTEX_A9)
 403                 exynos_scu_enable();
 404
 405         if (call_firmware_op(resume) == -ENOSYS
 406             && cpuid == ARM_CPU_PART_CORTEX_A9)
 407                 exynos_cpu_restore_register();
 408
 409 early_wakeup:
 410
 411         /* Clear SLEEP mode set in INFORM1 */
 412         pmu_raw_writel(0x0, S5P_INFORM1);
 413         exynos_set_delayed_reset_assertion(true);
 414 }
 415
 416 static void exynos3250_pm_resume(void)
 417 {
 418         u32 cpuid = read_cpuid_part();
 419
 420         if (exynos_pm_central_resume())
 421                 goto early_wakeup;
 422
 423         pmu_raw_writel(S5P_USE_STANDBY_WFI_ALL, S5P_CENTRAL_SEQ_OPTION);
 424
 425         if (call_firmware_op(resume) == -ENOSYS
 426             && cpuid == ARM_CPU_PART_CORTEX_A9)
 427                 exynos_cpu_restore_register();
 428
 429 early_wakeup:
 430
 431         /* Clear SLEEP mode set in INFORM1 */
 432         pmu_raw_writel(0x0, S5P_INFORM1);
 433 }
 434
 435 static void exynos5420_prepare_pm_resume(void)
 436 {
 437         if (IS_ENABLED(CONFIG_EXYNOS5420_MCPM))
 438                 WARN_ON(mcpm_cpu_powered_up());
 439 }
 440
 441 static void exynos5420_pm_resume(void)
 442 {
 443         unsigned long tmp;
 444
 445         /* Restore the CPU0 low power state register */
 446         tmp = pmu_raw_readl(EXYNOS5_ARM_CORE0_SYS_PWR_REG);
 447         pmu_raw_writel(tmp | S5P_CORE_LOCAL_PWR_EN,
 448                        EXYNOS5_ARM_CORE0_SYS_PWR_REG);
 449
 450         /* Restore the sysram cpu state register */
 451         writel_relaxed(exynos5420_cpu_state,
 452                        sysram_base_addr + EXYNOS5420_CPU_STATE);
 453
 454         pmu_raw_writel(EXYNOS5420_USE_STANDBY_WFI_ALL,
 455                         S5P_CENTRAL_SEQ_OPTION);
 456
 457         if (exynos_pm_central_resume())
 458                 goto early_wakeup;
 459
 460         pmu_raw_writel(exynos_pmu_spare3, S5P_PMU_SPARE3);
 461
 462 early_wakeup:
 463
 464         tmp = pmu_raw_readl(EXYNOS5420_SFR_AXI_CGDIS1);
 465         tmp &= ~EXYNOS5420_UFS;
 466         pmu_raw_writel(tmp, EXYNOS5420_SFR_AXI_CGDIS1);
 467
 468         tmp = pmu_raw_readl(EXYNOS5420_FSYS2_OPTION);
 469         tmp &= ~EXYNOS5420_EMULATION;
 470         pmu_raw_writel(tmp, EXYNOS5420_FSYS2_OPTION);
 471
 472         tmp = pmu_raw_readl(EXYNOS5420_PSGEN_OPTION);
 473         tmp &= ~EXYNOS5420_EMULATION;
 474         pmu_raw_writel(tmp, EXYNOS5420_PSGEN_OPTION);
 475
 476         /* Clear SLEEP mode set in INFORM1 */
 477         pmu_raw_writel(0x0, S5P_INFORM1);
 478 }
 479
 480 /*
 481  * Suspend Ops
 482  */
 483
 484 static int exynos_suspend_enter(suspend_state_t state)
 485 {
 486         int ret;
 487
 488         s3c_pm_debug_init();
 489
 490         S3C_PMDBG("%s: suspending the system...\n", __func__);
 491
 492         S3C_PMDBG("%s: wakeup masks: %08x,%08x\n", __func__,
 493                         exynos_irqwake_intmask, exynos_get_eint_wake_mask());
 494
 495         if (exynos_irqwake_intmask == -1U
 496             && exynos_get_eint_wake_mask() == -1U) {
 497                 pr_err("%s: No wake-up sources!\n", __func__);
 498                 pr_err("%s: Aborting sleep\n", __func__);
 499                 return -EINVAL;
 500         }
 501
 502         s3c_pm_save_uarts();
 503         if (pm_data->pm_prepare)
 504                 pm_data->pm_prepare();
 505         flush_cache_all();
 506         s3c_pm_check_store();
 507
 508         ret = call_firmware_op(suspend);
 509         if (ret == -ENOSYS)
 510                 ret = cpu_suspend(0, pm_data->cpu_suspend);
 511         if (ret)
 512                 return ret;
 513
 514         if (pm_data->pm_resume_prepare)
 515                 pm_data->pm_resume_prepare();
 516         s3c_pm_restore_uarts();
 517
 518         S3C_PMDBG("%s: wakeup stat: %08x\n", __func__,
 519                         pmu_raw_readl(S5P_WAKEUP_STAT));
 520
 521         s3c_pm_check_restore();
 522
 523         S3C_PMDBG("%s: resuming the system...\n", __func__);
 524
 525         return 0;
 526 }
 527
 528 static int exynos_suspend_prepare(void)
 529 {
 530         int ret;
 531
 532         /*
 533          * REVISIT: It would be better if struct platform_suspend_ops
 534          * .prepare handler get the suspend_state_t as a parameter to
 535          * avoid hard-coding the suspend to mem state. It's safe to do
 536          * it now only because the suspend_valid_only_mem function is
 537          * used as the .valid callback used to check if a given state
 538          * is supported by the platform anyways.
 539          */
 540         ret = regulator_suspend_prepare(PM_SUSPEND_MEM);
 541         if (ret) {
 542                 pr_err("Failed to prepare regulators for suspend (%d)\n", ret);
 543                 return ret;
 544         }
 545
 546         s3c_pm_check_prepare();
 547
 548         return 0;
 549 }
 550
 551 static void exynos_suspend_finish(void)
 552 {
 553         int ret;
 554
 555         s3c_pm_check_cleanup();
 556
 557         ret = regulator_suspend_finish();
 558         if (ret)
 559                 pr_warn("Failed to resume regulators from suspend (%d)\n", ret);
 560 }
 561
 562 static const struct platform_suspend_ops exynos_suspend_ops = {
 563         .enter          = exynos_suspend_enter,
 564         .prepare        = exynos_suspend_prepare,
 565         .finish         = exynos_suspend_finish,
 566         .valid          = suspend_valid_only_mem,
 567 };
 568
 569 static const struct exynos_pm_data exynos3250_pm_data = {
 570         .wkup_irq       = exynos3250_wkup_irq,
 571         .wake_disable_mask = ((0xFF << 8) | (0x1F << 1)),
 572         .pm_suspend     = exynos_pm_suspend,
 573         .pm_resume      = exynos3250_pm_resume,
 574         .pm_prepare     = exynos3250_pm_prepare,
 575         .cpu_suspend    = exynos3250_cpu_suspend,
 576 };
 577
 578 static const struct exynos_pm_data exynos4_pm_data = {
 579         .wkup_irq       = exynos4_wkup_irq,
 580         .wake_disable_mask = ((0xFF << 8) | (0x1F << 1)),
 581         .pm_suspend     = exynos_pm_suspend,
 582         .pm_resume      = exynos_pm_resume,
 583         .pm_prepare     = exynos_pm_prepare,
 584         .cpu_suspend    = exynos_cpu_suspend,
 585 };
 586
 587 static const struct exynos_pm_data exynos5250_pm_data = {
 588         .wkup_irq       = exynos5250_wkup_irq,
 589         .wake_disable_mask = ((0xFF << 8) | (0x1F << 1)),
 590         .pm_suspend     = exynos_pm_suspend,
 591         .pm_resume      = exynos_pm_resume,
 592         .pm_prepare     = exynos_pm_prepare,
 593         .cpu_suspend    = exynos_cpu_suspend,
 594 };
 595
 596 static const struct exynos_pm_data exynos5420_pm_data = {
 597         .wkup_irq       = exynos5250_wkup_irq,
 598         .wake_disable_mask = (0x7F << 7) | (0x1F << 1),
 599         .pm_resume_prepare = exynos5420_prepare_pm_resume,
 600         .pm_resume      = exynos5420_pm_resume,
 601         .pm_suspend     = exynos5420_pm_suspend,
 602         .pm_prepare     = exynos5420_pm_prepare,
 603         .cpu_suspend    = exynos5420_cpu_suspend,
 604 };
 605
 606 static const struct of_device_id exynos_pmu_of_device_ids[] __initconst = {
 607         {
 608                 .compatible = "samsung,exynos3250-pmu",
 609                 .data = &exynos3250_pm_data,
 610         }, {
 611                 .compatible = "samsung,exynos4210-pmu",
 612                 .data = &exynos4_pm_data,
 613         }, {
 614                 .compatible = "samsung,exynos4412-pmu",
 615                 .data = &exynos4_pm_data,
 616         }, {
 617                 .compatible = "samsung,exynos5250-pmu",
 618                 .data = &exynos5250_pm_data,
 619         }, {
 620                 .compatible = "samsung,exynos5420-pmu",
 621                 .data = &exynos5420_pm_data,
 622         },
 623         { /*sentinel*/ },
 624 };
 625
 626 static struct syscore_ops exynos_pm_syscore_ops;
 627
 628 void __init exynos_pm_init(void)
 629 {
 630         const struct of_device_id *match;
 631         struct device_node *np;
 632         u32 tmp;
 633
 634         np = of_find_matching_node_and_match(NULL, exynos_pmu_of_device_ids, &match);
 635         if (!np) {
 636                 pr_err("Failed to find PMU node\n");
 637                 return;
 638         }
 639
 640         if (WARN_ON(!of_find_property(np, "interrupt-controller", NULL))) {
 641                 pr_warn("Outdated DT detected, suspend/resume will NOT work\n");
 642                 return;
 643         }
 644
 645         pm_data = (const struct exynos_pm_data *) match->data;
 646
 647         /* All wakeup disable */
 648         tmp = pmu_raw_readl(S5P_WAKEUP_MASK);
 649         tmp |= pm_data->wake_disable_mask;
 650         pmu_raw_writel(tmp, S5P_WAKEUP_MASK);
 651
 652         exynos_pm_syscore_ops.suspend   = pm_data->pm_suspend;
 653         exynos_pm_syscore_ops.resume    = pm_data->pm_resume;
 654
 655         register_syscore_ops(&exynos_pm_syscore_ops);
 656         suspend_set_ops(&exynos_suspend_ops);
 657 }