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                 return -ENOMEM;
 207         }
 208
 209         /*
 210          * Clear the OF_POPULATED flag set in of_irq_init so that
 211          * later the Exynos PMU platform device won't be skipped.
 212          */
 213         of_node_clear_flag(node, OF_POPULATED);
 214
 215         return 0;
 216 }
 217
 218 #define EXYNOS_PMU_IRQ(symbol, name)    IRQCHIP_DECLARE(symbol, name, exynos_pmu_irq_init)
 219
 220 EXYNOS_PMU_IRQ(exynos3250_pmu_irq, "samsung,exynos3250-pmu");
 221 EXYNOS_PMU_IRQ(exynos4210_pmu_irq, "samsung,exynos4210-pmu");
 222 EXYNOS_PMU_IRQ(exynos4412_pmu_irq, "samsung,exynos4412-pmu");
 223 EXYNOS_PMU_IRQ(exynos5250_pmu_irq, "samsung,exynos5250-pmu");
 224 EXYNOS_PMU_IRQ(exynos5420_pmu_irq, "samsung,exynos5420-pmu");
 225
 226 static int exynos_cpu_do_idle(void)
 227 {
 228         /* issue the standby signal into the pm unit. */
 229         cpu_do_idle();
 230
 231         pr_info("Failed to suspend the system\n");
 232         return 1; /* Aborting suspend */
 233 }
 234 static void exynos_flush_cache_all(void)
 235 {
 236         flush_cache_all();
 237         outer_flush_all();
 238 }
 239
 240 static int exynos_cpu_suspend(unsigned long arg)
 241 {
 242         exynos_flush_cache_all();
 243         return exynos_cpu_do_idle();
 244 }
 245
 246 static int exynos3250_cpu_suspend(unsigned long arg)
 247 {
 248         flush_cache_all();
 249         return exynos_cpu_do_idle();
 250 }
 251
 252 static int exynos5420_cpu_suspend(unsigned long arg)
 253 {
 254         /* MCPM works with HW CPU identifiers */
 255         unsigned int mpidr = read_cpuid_mpidr();
 256         unsigned int cluster = MPIDR_AFFINITY_LEVEL(mpidr, 1);
 257         unsigned int cpu = MPIDR_AFFINITY_LEVEL(mpidr, 0);
 258
 259         writel_relaxed(0x0, sysram_base_addr + EXYNOS5420_CPU_STATE);
 260
 261         if (IS_ENABLED(CONFIG_EXYNOS5420_MCPM)) {
 262                 mcpm_set_entry_vector(cpu, cluster, exynos_cpu_resume);
 263                 mcpm_cpu_suspend();
 264         }
 265
 266         pr_info("Failed to suspend the system\n");
 267
 268         /* return value != 0 means failure */
 269         return 1;
 270 }
 271
 272 static void exynos_pm_set_wakeup_mask(void)
 273 {
 274         /* Set wake-up mask registers */
 275         pmu_raw_writel(exynos_get_eint_wake_mask(), S5P_EINT_WAKEUP_MASK);
 276         pmu_raw_writel(exynos_irqwake_intmask & ~(1 << 31), S5P_WAKEUP_MASK);
 277 }
 278
 279 static void exynos_pm_enter_sleep_mode(void)
 280 {
 281         /* Set value of power down register for sleep mode */
 282         exynos_sys_powerdown_conf(SYS_SLEEP);
 283         pmu_raw_writel(EXYNOS_SLEEP_MAGIC, S5P_INFORM1);
 284 }
 285
 286 static void exynos_pm_prepare(void)
 287 {
 288         exynos_set_delayed_reset_assertion(false);
 289
 290         /* Set wake-up mask registers */
 291         exynos_pm_set_wakeup_mask();
 292
 293         exynos_pm_enter_sleep_mode();
 294
 295         /* ensure at least INFORM0 has the resume address */
 296         pmu_raw_writel(__pa_symbol(exynos_cpu_resume), S5P_INFORM0);
 297 }
 298
 299 static void exynos3250_pm_prepare(void)
 300 {
 301         unsigned int tmp;
 302
 303         /* Set wake-up mask registers */
 304         exynos_pm_set_wakeup_mask();
 305
 306         tmp = pmu_raw_readl(EXYNOS3_ARM_L2_OPTION);
 307         tmp &= ~EXYNOS5_OPTION_USE_RETENTION;
 308         pmu_raw_writel(tmp, EXYNOS3_ARM_L2_OPTION);
 309
 310         exynos_pm_enter_sleep_mode();
 311
 312         /* ensure at least INFORM0 has the resume address */
 313         pmu_raw_writel(__pa_symbol(exynos_cpu_resume), S5P_INFORM0);
 314 }
 315
 316 static void exynos5420_pm_prepare(void)
 317 {
 318         unsigned int tmp;
 319
 320         /* Set wake-up mask registers */
 321         exynos_pm_set_wakeup_mask();
 322
 323         exynos_pmu_spare3 = pmu_raw_readl(S5P_PMU_SPARE3);
 324         /*
 325          * The cpu state needs to be saved and restored so that the
 326          * secondary CPUs will enter low power start. Though the U-Boot
 327          * is setting the cpu state with low power flag, the kernel
 328          * needs to restore it back in case, the primary cpu fails to
 329          * suspend for any reason.
 330          */
 331         exynos5420_cpu_state = readl_relaxed(sysram_base_addr +
 332                                              EXYNOS5420_CPU_STATE);
 333
 334         exynos_pm_enter_sleep_mode();
 335
 336         /* ensure at least INFORM0 has the resume address */
 337         if (IS_ENABLED(CONFIG_EXYNOS5420_MCPM))
 338                 pmu_raw_writel(__pa_symbol(mcpm_entry_point), S5P_INFORM0);
 339
 340         tmp = pmu_raw_readl(EXYNOS_L2_OPTION(0));
 341         tmp &= ~EXYNOS_L2_USE_RETENTION;
 342         pmu_raw_writel(tmp, EXYNOS_L2_OPTION(0));
 343
 344         tmp = pmu_raw_readl(EXYNOS5420_SFR_AXI_CGDIS1);
 345         tmp |= EXYNOS5420_UFS;
 346         pmu_raw_writel(tmp, EXYNOS5420_SFR_AXI_CGDIS1);
 347
 348         tmp = pmu_raw_readl(EXYNOS5420_ARM_COMMON_OPTION);
 349         tmp &= ~EXYNOS5420_L2RSTDISABLE_VALUE;
 350         pmu_raw_writel(tmp, EXYNOS5420_ARM_COMMON_OPTION);
 351
 352         tmp = pmu_raw_readl(EXYNOS5420_FSYS2_OPTION);
 353         tmp |= EXYNOS5420_EMULATION;
 354         pmu_raw_writel(tmp, EXYNOS5420_FSYS2_OPTION);
 355
 356         tmp = pmu_raw_readl(EXYNOS5420_PSGEN_OPTION);
 357         tmp |= EXYNOS5420_EMULATION;
 358         pmu_raw_writel(tmp, EXYNOS5420_PSGEN_OPTION);
 359 }
 360
 361
 362 static int exynos_pm_suspend(void)
 363 {
 364         exynos_pm_central_suspend();
 365
 366         /* Setting SEQ_OPTION register */
 367         pmu_raw_writel(S5P_USE_STANDBY_WFI0 | S5P_USE_STANDBY_WFE0,
 368                        S5P_CENTRAL_SEQ_OPTION);
 369
 370         if (read_cpuid_part() == ARM_CPU_PART_CORTEX_A9)
 371                 exynos_cpu_save_register();
 372
 373         return 0;
 374 }
 375
 376 static int exynos5420_pm_suspend(void)
 377 {
 378         u32 this_cluster;
 379
 380         exynos_pm_central_suspend();
 381
 382         /* Setting SEQ_OPTION register */
 383
 384         this_cluster = MPIDR_AFFINITY_LEVEL(read_cpuid_mpidr(), 1);
 385         if (!this_cluster)
 386                 pmu_raw_writel(EXYNOS5420_ARM_USE_STANDBY_WFI0,
 387                                 S5P_CENTRAL_SEQ_OPTION);
 388         else
 389                 pmu_raw_writel(EXYNOS5420_KFC_USE_STANDBY_WFI0,
 390                                 S5P_CENTRAL_SEQ_OPTION);
 391         return 0;
 392 }
 393
 394 static void exynos_pm_resume(void)
 395 {
 396         u32 cpuid = read_cpuid_part();
 397
 398         if (exynos_pm_central_resume())
 399                 goto early_wakeup;
 400
 401         if (cpuid == ARM_CPU_PART_CORTEX_A9)
 402                 exynos_scu_enable();
 403
 404         if (call_firmware_op(resume) == -ENOSYS
 405             && cpuid == ARM_CPU_PART_CORTEX_A9)
 406                 exynos_cpu_restore_register();
 407
 408 early_wakeup:
 409
 410         /* Clear SLEEP mode set in INFORM1 */
 411         pmu_raw_writel(0x0, S5P_INFORM1);
 412         exynos_set_delayed_reset_assertion(true);
 413 }
 414
 415 static void exynos3250_pm_resume(void)
 416 {
 417         u32 cpuid = read_cpuid_part();
 418
 419         if (exynos_pm_central_resume())
 420                 goto early_wakeup;
 421
 422         pmu_raw_writel(S5P_USE_STANDBY_WFI_ALL, S5P_CENTRAL_SEQ_OPTION);
 423
 424         if (call_firmware_op(resume) == -ENOSYS
 425             && cpuid == ARM_CPU_PART_CORTEX_A9)
 426                 exynos_cpu_restore_register();
 427
 428 early_wakeup:
 429
 430         /* Clear SLEEP mode set in INFORM1 */
 431         pmu_raw_writel(0x0, S5P_INFORM1);
 432 }
 433
 434 static void exynos5420_prepare_pm_resume(void)
 435 {
 436         if (IS_ENABLED(CONFIG_EXYNOS5420_MCPM))
 437                 WARN_ON(mcpm_cpu_powered_up());
 438 }
 439
 440 static void exynos5420_pm_resume(void)
 441 {
 442         unsigned long tmp;
 443
 444         /* Restore the CPU0 low power state register */
 445         tmp = pmu_raw_readl(EXYNOS5_ARM_CORE0_SYS_PWR_REG);
 446         pmu_raw_writel(tmp | S5P_CORE_LOCAL_PWR_EN,
 447                        EXYNOS5_ARM_CORE0_SYS_PWR_REG);
 448
 449         /* Restore the sysram cpu state register */
 450         writel_relaxed(exynos5420_cpu_state,
 451                        sysram_base_addr + EXYNOS5420_CPU_STATE);
 452
 453         pmu_raw_writel(EXYNOS5420_USE_STANDBY_WFI_ALL,
 454                         S5P_CENTRAL_SEQ_OPTION);
 455
 456         if (exynos_pm_central_resume())
 457                 goto early_wakeup;
 458
 459         pmu_raw_writel(exynos_pmu_spare3, S5P_PMU_SPARE3);
 460
 461 early_wakeup:
 462
 463         tmp = pmu_raw_readl(EXYNOS5420_SFR_AXI_CGDIS1);
 464         tmp &= ~EXYNOS5420_UFS;
 465         pmu_raw_writel(tmp, EXYNOS5420_SFR_AXI_CGDIS1);
 466
 467         tmp = pmu_raw_readl(EXYNOS5420_FSYS2_OPTION);
 468         tmp &= ~EXYNOS5420_EMULATION;
 469         pmu_raw_writel(tmp, EXYNOS5420_FSYS2_OPTION);
 470
 471         tmp = pmu_raw_readl(EXYNOS5420_PSGEN_OPTION);
 472         tmp &= ~EXYNOS5420_EMULATION;
 473         pmu_raw_writel(tmp, EXYNOS5420_PSGEN_OPTION);
 474
 475         /* Clear SLEEP mode set in INFORM1 */
 476         pmu_raw_writel(0x0, S5P_INFORM1);
 477 }
 478
 479 /*
 480  * Suspend Ops
 481  */
 482
 483 static int exynos_suspend_enter(suspend_state_t state)
 484 {
 485         int ret;
 486
 487         s3c_pm_debug_init();
 488
 489         S3C_PMDBG("%s: suspending the system...\n", __func__);
 490
 491         S3C_PMDBG("%s: wakeup masks: %08x,%08x\n", __func__,
 492                         exynos_irqwake_intmask, exynos_get_eint_wake_mask());
 493
 494         if (exynos_irqwake_intmask == -1U
 495             && exynos_get_eint_wake_mask() == -1U) {
 496                 pr_err("%s: No wake-up sources!\n", __func__);
 497                 pr_err("%s: Aborting sleep\n", __func__);
 498                 return -EINVAL;
 499         }
 500
 501         s3c_pm_save_uarts();
 502         if (pm_data->pm_prepare)
 503                 pm_data->pm_prepare();
 504         flush_cache_all();
 505         s3c_pm_check_store();
 506
 507         ret = call_firmware_op(suspend);
 508         if (ret == -ENOSYS)
 509                 ret = cpu_suspend(0, pm_data->cpu_suspend);
 510         if (ret)
 511                 return ret;
 512
 513         if (pm_data->pm_resume_prepare)
 514                 pm_data->pm_resume_prepare();
 515         s3c_pm_restore_uarts();
 516
 517         S3C_PMDBG("%s: wakeup stat: %08x\n", __func__,
 518                         pmu_raw_readl(S5P_WAKEUP_STAT));
 519
 520         s3c_pm_check_restore();
 521
 522         S3C_PMDBG("%s: resuming the system...\n", __func__);
 523
 524         return 0;
 525 }
 526
 527 static int exynos_suspend_prepare(void)
 528 {
 529         int ret;
 530
 531         /*
 532          * REVISIT: It would be better if struct platform_suspend_ops
 533          * .prepare handler get the suspend_state_t as a parameter to
 534          * avoid hard-coding the suspend to mem state. It's safe to do
 535          * it now only because the suspend_valid_only_mem function is
 536          * used as the .valid callback used to check if a given state
 537          * is supported by the platform anyways.
 538          */
 539         ret = regulator_suspend_prepare(PM_SUSPEND_MEM);
 540         if (ret) {
 541                 pr_err("Failed to prepare regulators for suspend (%d)\n", ret);
 542                 return ret;
 543         }
 544
 545         s3c_pm_check_prepare();
 546
 547         return 0;
 548 }
 549
 550 static void exynos_suspend_finish(void)
 551 {
 552         int ret;
 553
 554         s3c_pm_check_cleanup();
 555
 556         ret = regulator_suspend_finish();
 557         if (ret)
 558                 pr_warn("Failed to resume regulators from suspend (%d)\n", ret);
 559 }
 560
 561 static const struct platform_suspend_ops exynos_suspend_ops = {
 562         .enter          = exynos_suspend_enter,
 563         .prepare        = exynos_suspend_prepare,
 564         .finish         = exynos_suspend_finish,
 565         .valid          = suspend_valid_only_mem,
 566 };
 567
 568 static const struct exynos_pm_data exynos3250_pm_data = {
 569         .wkup_irq       = exynos3250_wkup_irq,
 570         .wake_disable_mask = ((0xFF << 8) | (0x1F << 1)),
 571         .pm_suspend     = exynos_pm_suspend,
 572         .pm_resume      = exynos3250_pm_resume,
 573         .pm_prepare     = exynos3250_pm_prepare,
 574         .cpu_suspend    = exynos3250_cpu_suspend,
 575 };
 576
 577 static const struct exynos_pm_data exynos4_pm_data = {
 578         .wkup_irq       = exynos4_wkup_irq,
 579         .wake_disable_mask = ((0xFF << 8) | (0x1F << 1)),
 580         .pm_suspend     = exynos_pm_suspend,
 581         .pm_resume      = exynos_pm_resume,
 582         .pm_prepare     = exynos_pm_prepare,
 583         .cpu_suspend    = exynos_cpu_suspend,
 584 };
 585
 586 static const struct exynos_pm_data exynos5250_pm_data = {
 587         .wkup_irq       = exynos5250_wkup_irq,
 588         .wake_disable_mask = ((0xFF << 8) | (0x1F << 1)),
 589         .pm_suspend     = exynos_pm_suspend,
 590         .pm_resume      = exynos_pm_resume,
 591         .pm_prepare     = exynos_pm_prepare,
 592         .cpu_suspend    = exynos_cpu_suspend,
 593 };
 594
 595 static const struct exynos_pm_data exynos5420_pm_data = {
 596         .wkup_irq       = exynos5250_wkup_irq,
 597         .wake_disable_mask = (0x7F << 7) | (0x1F << 1),
 598         .pm_resume_prepare = exynos5420_prepare_pm_resume,
 599         .pm_resume      = exynos5420_pm_resume,
 600         .pm_suspend     = exynos5420_pm_suspend,
 601         .pm_prepare     = exynos5420_pm_prepare,
 602         .cpu_suspend    = exynos5420_cpu_suspend,
 603 };
 604
 605 static const struct of_device_id exynos_pmu_of_device_ids[] __initconst = {
 606         {
 607                 .compatible = "samsung,exynos3250-pmu",
 608                 .data = &exynos3250_pm_data,
 609         }, {
 610                 .compatible = "samsung,exynos4210-pmu",
 611                 .data = &exynos4_pm_data,
 612         }, {
 613                 .compatible = "samsung,exynos4412-pmu",
 614                 .data = &exynos4_pm_data,
 615         }, {
 616                 .compatible = "samsung,exynos5250-pmu",
 617                 .data = &exynos5250_pm_data,
 618         }, {
 619                 .compatible = "samsung,exynos5420-pmu",
 620                 .data = &exynos5420_pm_data,
 621         },
 622         { /*sentinel*/ },
 623 };
 624
 625 static struct syscore_ops exynos_pm_syscore_ops;
 626
 627 void __init exynos_pm_init(void)
 628 {
 629         const struct of_device_id *match;
 630         struct device_node *np;
 631         u32 tmp;
 632
 633         np = of_find_matching_node_and_match(NULL, exynos_pmu_of_device_ids, &match);
 634         if (!np) {
 635                 pr_err("Failed to find PMU node\n");
 636                 return;
 637         }
 638
 639         if (WARN_ON(!of_find_property(np, "interrupt-controller", NULL))) {
 640                 pr_warn("Outdated DT detected, suspend/resume will NOT work\n");
 641                 return;
 642         }
 643
 644         pm_data = (const struct exynos_pm_data *) match->data;
 645
 646         /* All wakeup disable */
 647         tmp = pmu_raw_readl(S5P_WAKEUP_MASK);
 648         tmp |= pm_data->wake_disable_mask;
 649         pmu_raw_writel(tmp, S5P_WAKEUP_MASK);
 650
 651         exynos_pm_syscore_ops.suspend   = pm_data->pm_suspend;
 652         exynos_pm_syscore_ops.resume    = pm_data->pm_resume;
 653
 654         register_syscore_ops(&exynos_pm_syscore_ops);
 655         suspend_set_ops(&exynos_suspend_ops);
 656 }