arch/arm/mach-exynos/suspend.c

   1 /*
   2  * Copyright (c) 2011-2014 Samsung Electronics Co., Ltd.
   3  *              http://www.samsung.com
   4  *
   5  * EXYNOS - Suspend support
   6  *
   7  * Based on arch/arm/mach-s3c2410/pm.c
   8  * Copyright (c) 2006 Simtec Electronics
   9  *      Ben Dooks <ben@simtec.co.uk>
  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 version 2 as
  13  * published by the Free Software Foundation.
  14  */
  15
  16 #include <linux/init.h>
  17 #include <linux/suspend.h>
  18 #include <linux/syscore_ops.h>
  19 #include <linux/cpu_pm.h>
  20 #include <linux/io.h>
  21 #include <linux/irq.h>
  22 #include <linux/irqchip.h>
  23 #include <linux/irqdomain.h>
  24 #include <linux/of_address.h>
  25 #include <linux/err.h>
  26 #include <linux/regulator/machine.h>
  27 #include <linux/soc/samsung/exynos-pmu.h>
  28 #include <linux/soc/samsung/exynos-regs-pmu.h>
  29
  30 #include <asm/cacheflush.h>
  31 #include <asm/hardware/cache-l2x0.h>
  32 #include <asm/firmware.h>
  33 #include <asm/mcpm.h>
  34 #include <asm/smp_scu.h>
  35 #include <asm/suspend.h>
  36
  37 #include <mach/map.h>
  38
  39 #include <plat/pm-common.h>
  40
  41 #include "common.h"
  42
  43 #define REG_TABLE_END (-1U)
  44
  45 #define EXYNOS5420_CPU_STATE    0x28
  46
  47 /**
  48  * struct exynos_wkup_irq - PMU IRQ to mask mapping
  49  * @hwirq: Hardware IRQ signal of the PMU
  50  * @mask: Mask in PMU wake-up mask register
  51  */
  52 struct exynos_wkup_irq {
  53         unsigned int hwirq;
  54         u32 mask;
  55 };
  56
  57 struct exynos_pm_data {
  58         const struct exynos_wkup_irq *wkup_irq;
  59         unsigned int wake_disable_mask;
  60         unsigned int *release_ret_regs;
  61
  62         void (*pm_prepare)(void);
  63         void (*pm_resume_prepare)(void);
  64         void (*pm_resume)(void);
  65         int (*pm_suspend)(void);
  66         int (*cpu_suspend)(unsigned long);
  67 };
  68
  69 static const struct exynos_pm_data *pm_data;
  70
  71 static int exynos5420_cpu_state;
  72 static unsigned int exynos_pmu_spare3;
  73
  74 /*
  75  * GIC wake-up support
  76  */
  77
  78 static u32 exynos_irqwake_intmask = 0xffffffff;
  79
  80 static const struct exynos_wkup_irq exynos3250_wkup_irq[] = {
  81         { 73, BIT(1) }, /* RTC alarm */
  82         { 74, BIT(2) }, /* RTC tick */
  83         { /* sentinel */ },
  84 };
  85
  86 static const struct exynos_wkup_irq exynos4_wkup_irq[] = {
  87         { 44, BIT(1) }, /* RTC alarm */
  88         { 45, BIT(2) }, /* RTC tick */
  89         { /* sentinel */ },
  90 };
  91
  92 static const struct exynos_wkup_irq exynos5250_wkup_irq[] = {
  93         { 43, BIT(1) }, /* RTC alarm */
  94         { 44, BIT(2) }, /* RTC tick */
  95         { /* sentinel */ },
  96 };
  97
  98 static unsigned int exynos_release_ret_regs[] = {
  99         S5P_PAD_RET_MAUDIO_OPTION,
 100         S5P_PAD_RET_GPIO_OPTION,
 101         S5P_PAD_RET_UART_OPTION,
 102         S5P_PAD_RET_MMCA_OPTION,
 103         S5P_PAD_RET_MMCB_OPTION,
 104         S5P_PAD_RET_EBIA_OPTION,
 105         S5P_PAD_RET_EBIB_OPTION,
 106         REG_TABLE_END,
 107 };
 108
 109 static unsigned int exynos3250_release_ret_regs[] = {
 110         S5P_PAD_RET_MAUDIO_OPTION,
 111         S5P_PAD_RET_GPIO_OPTION,
 112         S5P_PAD_RET_UART_OPTION,
 113         S5P_PAD_RET_MMCA_OPTION,
 114         S5P_PAD_RET_MMCB_OPTION,
 115         S5P_PAD_RET_EBIA_OPTION,
 116         S5P_PAD_RET_EBIB_OPTION,
 117         S5P_PAD_RET_MMC2_OPTION,
 118         S5P_PAD_RET_SPI_OPTION,
 119         REG_TABLE_END,
 120 };
 121
 122 static unsigned int exynos5420_release_ret_regs[] = {
 123         EXYNOS_PAD_RET_DRAM_OPTION,
 124         EXYNOS_PAD_RET_MAUDIO_OPTION,
 125         EXYNOS_PAD_RET_JTAG_OPTION,
 126         EXYNOS5420_PAD_RET_GPIO_OPTION,
 127         EXYNOS5420_PAD_RET_UART_OPTION,
 128         EXYNOS5420_PAD_RET_MMCA_OPTION,
 129         EXYNOS5420_PAD_RET_MMCB_OPTION,
 130         EXYNOS5420_PAD_RET_MMCC_OPTION,
 131         EXYNOS5420_PAD_RET_HSI_OPTION,
 132         EXYNOS_PAD_RET_EBIA_OPTION,
 133         EXYNOS_PAD_RET_EBIB_OPTION,
 134         EXYNOS5420_PAD_RET_SPI_OPTION,
 135         EXYNOS5420_PAD_RET_DRAM_COREBLK_OPTION,
 136         REG_TABLE_END,
 137 };
 138
 139 static int exynos_irq_set_wake(struct irq_data *data, unsigned int state)
 140 {
 141         const struct exynos_wkup_irq *wkup_irq;
 142
 143         if (!pm_data->wkup_irq)
 144                 return -ENOENT;
 145         wkup_irq = pm_data->wkup_irq;
 146
 147         while (wkup_irq->mask) {
 148                 if (wkup_irq->hwirq == data->hwirq) {
 149                         if (!state)
 150                                 exynos_irqwake_intmask |= wkup_irq->mask;
 151                         else
 152                                 exynos_irqwake_intmask &= ~wkup_irq->mask;
 153                         return 0;
 154                 }
 155                 ++wkup_irq;
 156         }
 157
 158         return -ENOENT;
 159 }
 160
 161 static struct irq_chip exynos_pmu_chip = {
 162         .name                   = "PMU",
 163         .irq_eoi                = irq_chip_eoi_parent,
 164         .irq_mask               = irq_chip_mask_parent,
 165         .irq_unmask             = irq_chip_unmask_parent,
 166         .irq_retrigger          = irq_chip_retrigger_hierarchy,
 167         .irq_set_wake           = exynos_irq_set_wake,
 168 #ifdef CONFIG_SMP
 169         .irq_set_affinity       = irq_chip_set_affinity_parent,
 170 #endif
 171 };
 172
 173 static int exynos_pmu_domain_translate(struct irq_domain *d,
 174                                        struct irq_fwspec *fwspec,
 175                                        unsigned long *hwirq,
 176                                        unsigned int *type)
 177 {
 178         if (is_of_node(fwspec->fwnode)) {
 179                 if (fwspec->param_count != 3)
 180                         return -EINVAL;
 181
 182                 /* No PPI should point to this domain */
 183                 if (fwspec->param[0] != 0)
 184                         return -EINVAL;
 185
 186                 *hwirq = fwspec->param[1];
 187                 *type = fwspec->param[2];
 188                 return 0;
 189         }
 190
 191         return -EINVAL;
 192 }
 193
 194 static int exynos_pmu_domain_alloc(struct irq_domain *domain,
 195                                    unsigned int virq,
 196                                    unsigned int nr_irqs, void *data)
 197 {
 198         struct irq_fwspec *fwspec = data;
 199         struct irq_fwspec parent_fwspec;
 200         irq_hw_number_t hwirq;
 201         int i;
 202
 203         if (fwspec->param_count != 3)
 204                 return -EINVAL; /* Not GIC compliant */
 205         if (fwspec->param[0] != 0)
 206                 return -EINVAL; /* No PPI should point to this domain */
 207
 208         hwirq = fwspec->param[1];
 209
 210         for (i = 0; i < nr_irqs; i++)
 211                 irq_domain_set_hwirq_and_chip(domain, virq + i, hwirq + i,
 212                                               &exynos_pmu_chip, NULL);
 213
 214         parent_fwspec = *fwspec;
 215         parent_fwspec.fwnode = domain->parent->fwnode;
 216         return irq_domain_alloc_irqs_parent(domain, virq, nr_irqs,
 217                                             &parent_fwspec);
 218 }
 219
 220 static const struct irq_domain_ops exynos_pmu_domain_ops = {
 221         .translate      = exynos_pmu_domain_translate,
 222         .alloc          = exynos_pmu_domain_alloc,
 223         .free           = irq_domain_free_irqs_common,
 224 };
 225
 226 static int __init exynos_pmu_irq_init(struct device_node *node,
 227                                       struct device_node *parent)
 228 {
 229         struct irq_domain *parent_domain, *domain;
 230
 231         if (!parent) {
 232                 pr_err("%s: no parent, giving up\n", node->full_name);
 233                 return -ENODEV;
 234         }
 235
 236         parent_domain = irq_find_host(parent);
 237         if (!parent_domain) {
 238                 pr_err("%s: unable to obtain parent domain\n", node->full_name);
 239                 return -ENXIO;
 240         }
 241
 242         pmu_base_addr = of_iomap(node, 0);
 243
 244         if (!pmu_base_addr) {
 245                 pr_err("%s: failed to find exynos pmu register\n",
 246                        node->full_name);
 247                 return -ENOMEM;
 248         }
 249
 250         domain = irq_domain_add_hierarchy(parent_domain, 0, 0,
 251                                           node, &exynos_pmu_domain_ops,
 252                                           NULL);
 253         if (!domain) {
 254                 iounmap(pmu_base_addr);
 255                 return -ENOMEM;
 256         }
 257
 258         return 0;
 259 }
 260
 261 #define EXYNOS_PMU_IRQ(symbol, name)    IRQCHIP_DECLARE(symbol, name, exynos_pmu_irq_init)
 262
 263 EXYNOS_PMU_IRQ(exynos3250_pmu_irq, "samsung,exynos3250-pmu");
 264 EXYNOS_PMU_IRQ(exynos4210_pmu_irq, "samsung,exynos4210-pmu");
 265 EXYNOS_PMU_IRQ(exynos4212_pmu_irq, "samsung,exynos4212-pmu");
 266 EXYNOS_PMU_IRQ(exynos4412_pmu_irq, "samsung,exynos4412-pmu");
 267 EXYNOS_PMU_IRQ(exynos4415_pmu_irq, "samsung,exynos4415-pmu");
 268 EXYNOS_PMU_IRQ(exynos5250_pmu_irq, "samsung,exynos5250-pmu");
 269 EXYNOS_PMU_IRQ(exynos5420_pmu_irq, "samsung,exynos5420-pmu");
 270
 271 static int exynos_cpu_do_idle(void)
 272 {
 273         /* issue the standby signal into the pm unit. */
 274         cpu_do_idle();
 275
 276         pr_info("Failed to suspend the system\n");
 277         return 1; /* Aborting suspend */
 278 }
 279 static void exynos_flush_cache_all(void)
 280 {
 281         flush_cache_all();
 282         outer_flush_all();
 283 }
 284
 285 static int exynos_cpu_suspend(unsigned long arg)
 286 {
 287         exynos_flush_cache_all();
 288         return exynos_cpu_do_idle();
 289 }
 290
 291 static int exynos3250_cpu_suspend(unsigned long arg)
 292 {
 293         flush_cache_all();
 294         return exynos_cpu_do_idle();
 295 }
 296
 297 static int exynos5420_cpu_suspend(unsigned long arg)
 298 {
 299         /* MCPM works with HW CPU identifiers */
 300         unsigned int mpidr = read_cpuid_mpidr();
 301         unsigned int cluster = MPIDR_AFFINITY_LEVEL(mpidr, 1);
 302         unsigned int cpu = MPIDR_AFFINITY_LEVEL(mpidr, 0);
 303
 304         writel_relaxed(0x0, sysram_base_addr + EXYNOS5420_CPU_STATE);
 305
 306         if (IS_ENABLED(CONFIG_EXYNOS5420_MCPM)) {
 307                 mcpm_set_entry_vector(cpu, cluster, exynos_cpu_resume);
 308                 mcpm_cpu_suspend();
 309         }
 310
 311         pr_info("Failed to suspend the system\n");
 312
 313         /* return value != 0 means failure */
 314         return 1;
 315 }
 316
 317 static void exynos_pm_set_wakeup_mask(void)
 318 {
 319         /* Set wake-up mask registers */
 320         pmu_raw_writel(exynos_get_eint_wake_mask(), S5P_EINT_WAKEUP_MASK);
 321         pmu_raw_writel(exynos_irqwake_intmask & ~(1 << 31), S5P_WAKEUP_MASK);
 322 }
 323
 324 static void exynos_pm_enter_sleep_mode(void)
 325 {
 326         /* Set value of power down register for sleep mode */
 327         exynos_sys_powerdown_conf(SYS_SLEEP);
 328         pmu_raw_writel(EXYNOS_SLEEP_MAGIC, S5P_INFORM1);
 329 }
 330
 331 static void exynos_pm_prepare(void)
 332 {
 333         exynos_set_delayed_reset_assertion(false);
 334
 335         /* Set wake-up mask registers */
 336         exynos_pm_set_wakeup_mask();
 337
 338         exynos_pm_enter_sleep_mode();
 339
 340         /* ensure at least INFORM0 has the resume address */
 341         pmu_raw_writel(virt_to_phys(exynos_cpu_resume), S5P_INFORM0);
 342 }
 343
 344 static void exynos3250_pm_prepare(void)
 345 {
 346         unsigned int tmp;
 347
 348         /* Set wake-up mask registers */
 349         exynos_pm_set_wakeup_mask();
 350
 351         tmp = pmu_raw_readl(EXYNOS3_ARM_L2_OPTION);
 352         tmp &= ~EXYNOS5_OPTION_USE_RETENTION;
 353         pmu_raw_writel(tmp, EXYNOS3_ARM_L2_OPTION);
 354
 355         exynos_pm_enter_sleep_mode();
 356
 357         /* ensure at least INFORM0 has the resume address */
 358         pmu_raw_writel(virt_to_phys(exynos_cpu_resume), S5P_INFORM0);
 359 }
 360
 361 static void exynos5420_pm_prepare(void)
 362 {
 363         unsigned int tmp;
 364
 365         /* Set wake-up mask registers */
 366         exynos_pm_set_wakeup_mask();
 367
 368         exynos_pmu_spare3 = pmu_raw_readl(S5P_PMU_SPARE3);
 369         /*
 370          * The cpu state needs to be saved and restored so that the
 371          * secondary CPUs will enter low power start. Though the U-Boot
 372          * is setting the cpu state with low power flag, the kernel
 373          * needs to restore it back in case, the primary cpu fails to
 374          * suspend for any reason.
 375          */
 376         exynos5420_cpu_state = readl_relaxed(sysram_base_addr +
 377                                              EXYNOS5420_CPU_STATE);
 378
 379         exynos_pm_enter_sleep_mode();
 380
 381         /* ensure at least INFORM0 has the resume address */
 382         if (IS_ENABLED(CONFIG_EXYNOS5420_MCPM))
 383                 pmu_raw_writel(virt_to_phys(mcpm_entry_point), S5P_INFORM0);
 384
 385         tmp = pmu_raw_readl(EXYNOS5_ARM_L2_OPTION);
 386         tmp &= ~EXYNOS5_USE_RETENTION;
 387         pmu_raw_writel(tmp, EXYNOS5_ARM_L2_OPTION);
 388
 389         tmp = pmu_raw_readl(EXYNOS5420_SFR_AXI_CGDIS1);
 390         tmp |= EXYNOS5420_UFS;
 391         pmu_raw_writel(tmp, EXYNOS5420_SFR_AXI_CGDIS1);
 392
 393         tmp = pmu_raw_readl(EXYNOS5420_ARM_COMMON_OPTION);
 394         tmp &= ~EXYNOS5420_L2RSTDISABLE_VALUE;
 395         pmu_raw_writel(tmp, EXYNOS5420_ARM_COMMON_OPTION);
 396
 397         tmp = pmu_raw_readl(EXYNOS5420_FSYS2_OPTION);
 398         tmp |= EXYNOS5420_EMULATION;
 399         pmu_raw_writel(tmp, EXYNOS5420_FSYS2_OPTION);
 400
 401         tmp = pmu_raw_readl(EXYNOS5420_PSGEN_OPTION);
 402         tmp |= EXYNOS5420_EMULATION;
 403         pmu_raw_writel(tmp, EXYNOS5420_PSGEN_OPTION);
 404 }
 405
 406
 407 static int exynos_pm_suspend(void)
 408 {
 409         exynos_pm_central_suspend();
 410
 411         /* Setting SEQ_OPTION register */
 412         pmu_raw_writel(S5P_USE_STANDBY_WFI0 | S5P_USE_STANDBY_WFE0,
 413                        S5P_CENTRAL_SEQ_OPTION);
 414
 415         if (read_cpuid_part() == ARM_CPU_PART_CORTEX_A9)
 416                 exynos_cpu_save_register();
 417
 418         return 0;
 419 }
 420
 421 static int exynos5420_pm_suspend(void)
 422 {
 423         u32 this_cluster;
 424
 425         exynos_pm_central_suspend();
 426
 427         /* Setting SEQ_OPTION register */
 428
 429         this_cluster = MPIDR_AFFINITY_LEVEL(read_cpuid_mpidr(), 1);
 430         if (!this_cluster)
 431                 pmu_raw_writel(EXYNOS5420_ARM_USE_STANDBY_WFI0,
 432                                 S5P_CENTRAL_SEQ_OPTION);
 433         else
 434                 pmu_raw_writel(EXYNOS5420_KFC_USE_STANDBY_WFI0,
 435                                 S5P_CENTRAL_SEQ_OPTION);
 436         return 0;
 437 }
 438
 439 static void exynos_pm_release_retention(void)
 440 {
 441         unsigned int i;
 442
 443         for (i = 0; (pm_data->release_ret_regs[i] != REG_TABLE_END); i++)
 444                 pmu_raw_writel(EXYNOS_WAKEUP_FROM_LOWPWR,
 445                                 pm_data->release_ret_regs[i]);
 446 }
 447
 448 static void exynos_pm_resume(void)
 449 {
 450         u32 cpuid = read_cpuid_part();
 451
 452         if (exynos_pm_central_resume())
 453                 goto early_wakeup;
 454
 455         /* For release retention */
 456         exynos_pm_release_retention();
 457
 458         if (cpuid == ARM_CPU_PART_CORTEX_A9)
 459                 scu_enable(S5P_VA_SCU);
 460
 461         if (call_firmware_op(resume) == -ENOSYS
 462             && cpuid == ARM_CPU_PART_CORTEX_A9)
 463                 exynos_cpu_restore_register();
 464
 465 early_wakeup:
 466
 467         /* Clear SLEEP mode set in INFORM1 */
 468         pmu_raw_writel(0x0, S5P_INFORM1);
 469         exynos_set_delayed_reset_assertion(true);
 470 }
 471
 472 static void exynos3250_pm_resume(void)
 473 {
 474         u32 cpuid = read_cpuid_part();
 475
 476         if (exynos_pm_central_resume())
 477                 goto early_wakeup;
 478
 479         /* For release retention */
 480         exynos_pm_release_retention();
 481
 482         pmu_raw_writel(S5P_USE_STANDBY_WFI_ALL, S5P_CENTRAL_SEQ_OPTION);
 483
 484         if (call_firmware_op(resume) == -ENOSYS
 485             && cpuid == ARM_CPU_PART_CORTEX_A9)
 486                 exynos_cpu_restore_register();
 487
 488 early_wakeup:
 489
 490         /* Clear SLEEP mode set in INFORM1 */
 491         pmu_raw_writel(0x0, S5P_INFORM1);
 492 }
 493
 494 static void exynos5420_prepare_pm_resume(void)
 495 {
 496         if (IS_ENABLED(CONFIG_EXYNOS5420_MCPM))
 497                 WARN_ON(mcpm_cpu_powered_up());
 498 }
 499
 500 static void exynos5420_pm_resume(void)
 501 {
 502         unsigned long tmp;
 503
 504         /* Restore the CPU0 low power state register */
 505         tmp = pmu_raw_readl(EXYNOS5_ARM_CORE0_SYS_PWR_REG);
 506         pmu_raw_writel(tmp | S5P_CORE_LOCAL_PWR_EN,
 507                        EXYNOS5_ARM_CORE0_SYS_PWR_REG);
 508
 509         /* Restore the sysram cpu state register */
 510         writel_relaxed(exynos5420_cpu_state,
 511                        sysram_base_addr + EXYNOS5420_CPU_STATE);
 512
 513         pmu_raw_writel(EXYNOS5420_USE_STANDBY_WFI_ALL,
 514                         S5P_CENTRAL_SEQ_OPTION);
 515
 516         if (exynos_pm_central_resume())
 517                 goto early_wakeup;
 518
 519         /* For release retention */
 520         exynos_pm_release_retention();
 521
 522         pmu_raw_writel(exynos_pmu_spare3, S5P_PMU_SPARE3);
 523
 524 early_wakeup:
 525
 526         tmp = pmu_raw_readl(EXYNOS5420_SFR_AXI_CGDIS1);
 527         tmp &= ~EXYNOS5420_UFS;
 528         pmu_raw_writel(tmp, EXYNOS5420_SFR_AXI_CGDIS1);
 529
 530         tmp = pmu_raw_readl(EXYNOS5420_FSYS2_OPTION);
 531         tmp &= ~EXYNOS5420_EMULATION;
 532         pmu_raw_writel(tmp, EXYNOS5420_FSYS2_OPTION);
 533
 534         tmp = pmu_raw_readl(EXYNOS5420_PSGEN_OPTION);
 535         tmp &= ~EXYNOS5420_EMULATION;
 536         pmu_raw_writel(tmp, EXYNOS5420_PSGEN_OPTION);
 537
 538         /* Clear SLEEP mode set in INFORM1 */
 539         pmu_raw_writel(0x0, S5P_INFORM1);
 540 }
 541
 542 /*
 543  * Suspend Ops
 544  */
 545
 546 static int exynos_suspend_enter(suspend_state_t state)
 547 {
 548         int ret;
 549
 550         s3c_pm_debug_init();
 551
 552         S3C_PMDBG("%s: suspending the system...\n", __func__);
 553
 554         S3C_PMDBG("%s: wakeup masks: %08x,%08x\n", __func__,
 555                         exynos_irqwake_intmask, exynos_get_eint_wake_mask());
 556
 557         if (exynos_irqwake_intmask == -1U
 558             && exynos_get_eint_wake_mask() == -1U) {
 559                 pr_err("%s: No wake-up sources!\n", __func__);
 560                 pr_err("%s: Aborting sleep\n", __func__);
 561                 return -EINVAL;
 562         }
 563
 564         s3c_pm_save_uarts();
 565         if (pm_data->pm_prepare)
 566                 pm_data->pm_prepare();
 567         flush_cache_all();
 568         s3c_pm_check_store();
 569
 570         ret = call_firmware_op(suspend);
 571         if (ret == -ENOSYS)
 572                 ret = cpu_suspend(0, pm_data->cpu_suspend);
 573         if (ret)
 574                 return ret;
 575
 576         if (pm_data->pm_resume_prepare)
 577                 pm_data->pm_resume_prepare();
 578         s3c_pm_restore_uarts();
 579
 580         S3C_PMDBG("%s: wakeup stat: %08x\n", __func__,
 581                         pmu_raw_readl(S5P_WAKEUP_STAT));
 582
 583         s3c_pm_check_restore();
 584
 585         S3C_PMDBG("%s: resuming the system...\n", __func__);
 586
 587         return 0;
 588 }
 589
 590 static int exynos_suspend_prepare(void)
 591 {
 592         int ret;
 593
 594         /*
 595          * REVISIT: It would be better if struct platform_suspend_ops
 596          * .prepare handler get the suspend_state_t as a parameter to
 597          * avoid hard-coding the suspend to mem state. It's safe to do
 598          * it now only because the suspend_valid_only_mem function is
 599          * used as the .valid callback used to check if a given state
 600          * is supported by the platform anyways.
 601          */
 602         ret = regulator_suspend_prepare(PM_SUSPEND_MEM);
 603         if (ret) {
 604                 pr_err("Failed to prepare regulators for suspend (%d)\n", ret);
 605                 return ret;
 606         }
 607
 608         s3c_pm_check_prepare();
 609
 610         return 0;
 611 }
 612
 613 static void exynos_suspend_finish(void)
 614 {
 615         int ret;
 616
 617         s3c_pm_check_cleanup();
 618
 619         ret = regulator_suspend_finish();
 620         if (ret)
 621                 pr_warn("Failed to resume regulators from suspend (%d)\n", ret);
 622 }
 623
 624 static const struct platform_suspend_ops exynos_suspend_ops = {
 625         .enter          = exynos_suspend_enter,
 626         .prepare        = exynos_suspend_prepare,
 627         .finish         = exynos_suspend_finish,
 628         .valid          = suspend_valid_only_mem,
 629 };
 630
 631 static const struct exynos_pm_data exynos3250_pm_data = {
 632         .wkup_irq       = exynos3250_wkup_irq,
 633         .wake_disable_mask = ((0xFF << 8) | (0x1F << 1)),
 634         .release_ret_regs = exynos3250_release_ret_regs,
 635         .pm_suspend     = exynos_pm_suspend,
 636         .pm_resume      = exynos3250_pm_resume,
 637         .pm_prepare     = exynos3250_pm_prepare,
 638         .cpu_suspend    = exynos3250_cpu_suspend,
 639 };
 640
 641 static const struct exynos_pm_data exynos4_pm_data = {
 642         .wkup_irq       = exynos4_wkup_irq,
 643         .wake_disable_mask = ((0xFF << 8) | (0x1F << 1)),
 644         .release_ret_regs = exynos_release_ret_regs,
 645         .pm_suspend     = exynos_pm_suspend,
 646         .pm_resume      = exynos_pm_resume,
 647         .pm_prepare     = exynos_pm_prepare,
 648         .cpu_suspend    = exynos_cpu_suspend,
 649 };
 650
 651 static const struct exynos_pm_data exynos5250_pm_data = {
 652         .wkup_irq       = exynos5250_wkup_irq,
 653         .wake_disable_mask = ((0xFF << 8) | (0x1F << 1)),
 654         .release_ret_regs = exynos_release_ret_regs,
 655         .pm_suspend     = exynos_pm_suspend,
 656         .pm_resume      = exynos_pm_resume,
 657         .pm_prepare     = exynos_pm_prepare,
 658         .cpu_suspend    = exynos_cpu_suspend,
 659 };
 660
 661 static const struct exynos_pm_data exynos5420_pm_data = {
 662         .wkup_irq       = exynos5250_wkup_irq,
 663         .wake_disable_mask = (0x7F << 7) | (0x1F << 1),
 664         .release_ret_regs = exynos5420_release_ret_regs,
 665         .pm_resume_prepare = exynos5420_prepare_pm_resume,
 666         .pm_resume      = exynos5420_pm_resume,
 667         .pm_suspend     = exynos5420_pm_suspend,
 668         .pm_prepare     = exynos5420_pm_prepare,
 669         .cpu_suspend    = exynos5420_cpu_suspend,
 670 };
 671
 672 static const struct of_device_id exynos_pmu_of_device_ids[] __initconst = {
 673         {
 674                 .compatible = "samsung,exynos3250-pmu",
 675                 .data = &exynos3250_pm_data,
 676         }, {
 677                 .compatible = "samsung,exynos4210-pmu",
 678                 .data = &exynos4_pm_data,
 679         }, {
 680                 .compatible = "samsung,exynos4212-pmu",
 681                 .data = &exynos4_pm_data,
 682         }, {
 683                 .compatible = "samsung,exynos4412-pmu",
 684                 .data = &exynos4_pm_data,
 685         }, {
 686                 .compatible = "samsung,exynos5250-pmu",
 687                 .data = &exynos5250_pm_data,
 688         }, {
 689                 .compatible = "samsung,exynos5420-pmu",
 690                 .data = &exynos5420_pm_data,
 691         },
 692         { /*sentinel*/ },
 693 };
 694
 695 static struct syscore_ops exynos_pm_syscore_ops;
 696
 697 void __init exynos_pm_init(void)
 698 {
 699         const struct of_device_id *match;
 700         struct device_node *np;
 701         u32 tmp;
 702
 703         np = of_find_matching_node_and_match(NULL, exynos_pmu_of_device_ids, &match);
 704         if (!np) {
 705                 pr_err("Failed to find PMU node\n");
 706                 return;
 707         }
 708
 709         if (WARN_ON(!of_find_property(np, "interrupt-controller", NULL))) {
 710                 pr_warn("Outdated DT detected, suspend/resume will NOT work\n");
 711                 return;
 712         }
 713
 714         pm_data = (const struct exynos_pm_data *) match->data;
 715
 716         /* All wakeup disable */
 717         tmp = pmu_raw_readl(S5P_WAKEUP_MASK);
 718         tmp |= pm_data->wake_disable_mask;
 719         pmu_raw_writel(tmp, S5P_WAKEUP_MASK);
 720
 721         exynos_pm_syscore_ops.suspend   = pm_data->pm_suspend;
 722         exynos_pm_syscore_ops.resume    = pm_data->pm_resume;
 723
 724         register_syscore_ops(&exynos_pm_syscore_ops);
 725         suspend_set_ops(&exynos_suspend_ops);
 726 }