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/irqdomain.h>
  23 #include <linux/of_address.h>
  24 #include <linux/err.h>
  25 #include <linux/regulator/machine.h>
  26
  27 #include <asm/cacheflush.h>
  28 #include <asm/hardware/cache-l2x0.h>
  29 #include <asm/firmware.h>
  30 #include <asm/mcpm.h>
  31 #include <asm/smp_scu.h>
  32 #include <asm/suspend.h>
  33
  34 #include <plat/pm-common.h>
  35 #include <plat/regs-srom.h>
  36
  37 #include "common.h"
  38 #include "regs-pmu.h"
  39 #include "exynos-pmu.h"
  40
  41 #define S5P_CHECK_SLEEP 0x00000BAD
  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 static struct sleep_save exynos_core_save[] = {
  58         /* SROM side */
  59         SAVE_ITEM(S5P_SROM_BW),
  60         SAVE_ITEM(S5P_SROM_BC0),
  61         SAVE_ITEM(S5P_SROM_BC1),
  62         SAVE_ITEM(S5P_SROM_BC2),
  63         SAVE_ITEM(S5P_SROM_BC3),
  64 };
  65
  66 struct exynos_pm_data {
  67         const struct exynos_wkup_irq *wkup_irq;
  68         unsigned int wake_disable_mask;
  69         unsigned int *release_ret_regs;
  70
  71         void (*pm_prepare)(void);
  72         void (*pm_resume_prepare)(void);
  73         void (*pm_resume)(void);
  74         int (*pm_suspend)(void);
  75         int (*cpu_suspend)(unsigned long);
  76 };
  77
  78 static const struct exynos_pm_data *pm_data;
  79
  80 static int exynos5420_cpu_state;
  81 static unsigned int exynos_pmu_spare3;
  82
  83 /*
  84  * GIC wake-up support
  85  */
  86
  87 static u32 exynos_irqwake_intmask = 0xffffffff;
  88
  89 static const struct exynos_wkup_irq exynos3250_wkup_irq[] = {
  90         { 73, BIT(1) }, /* RTC alarm */
  91         { 74, BIT(2) }, /* RTC tick */
  92         { /* sentinel */ },
  93 };
  94
  95 static const struct exynos_wkup_irq exynos4_wkup_irq[] = {
  96         { 44, BIT(1) }, /* RTC alarm */
  97         { 45, BIT(2) }, /* RTC tick */
  98         { /* sentinel */ },
  99 };
 100
 101 static const struct exynos_wkup_irq exynos5250_wkup_irq[] = {
 102         { 43, BIT(1) }, /* RTC alarm */
 103         { 44, BIT(2) }, /* RTC tick */
 104         { /* sentinel */ },
 105 };
 106
 107 static unsigned int exynos_release_ret_regs[] = {
 108         S5P_PAD_RET_MAUDIO_OPTION,
 109         S5P_PAD_RET_GPIO_OPTION,
 110         S5P_PAD_RET_UART_OPTION,
 111         S5P_PAD_RET_MMCA_OPTION,
 112         S5P_PAD_RET_MMCB_OPTION,
 113         S5P_PAD_RET_EBIA_OPTION,
 114         S5P_PAD_RET_EBIB_OPTION,
 115         REG_TABLE_END,
 116 };
 117
 118 static unsigned int exynos3250_release_ret_regs[] = {
 119         S5P_PAD_RET_MAUDIO_OPTION,
 120         S5P_PAD_RET_GPIO_OPTION,
 121         S5P_PAD_RET_UART_OPTION,
 122         S5P_PAD_RET_MMCA_OPTION,
 123         S5P_PAD_RET_MMCB_OPTION,
 124         S5P_PAD_RET_EBIA_OPTION,
 125         S5P_PAD_RET_EBIB_OPTION,
 126         S5P_PAD_RET_MMC2_OPTION,
 127         S5P_PAD_RET_SPI_OPTION,
 128         REG_TABLE_END,
 129 };
 130
 131 static unsigned int exynos5420_release_ret_regs[] = {
 132         EXYNOS_PAD_RET_DRAM_OPTION,
 133         EXYNOS_PAD_RET_MAUDIO_OPTION,
 134         EXYNOS_PAD_RET_JTAG_OPTION,
 135         EXYNOS5420_PAD_RET_GPIO_OPTION,
 136         EXYNOS5420_PAD_RET_UART_OPTION,
 137         EXYNOS5420_PAD_RET_MMCA_OPTION,
 138         EXYNOS5420_PAD_RET_MMCB_OPTION,
 139         EXYNOS5420_PAD_RET_MMCC_OPTION,
 140         EXYNOS5420_PAD_RET_HSI_OPTION,
 141         EXYNOS_PAD_RET_EBIA_OPTION,
 142         EXYNOS_PAD_RET_EBIB_OPTION,
 143         EXYNOS5420_PAD_RET_SPI_OPTION,
 144         EXYNOS5420_PAD_RET_DRAM_COREBLK_OPTION,
 145         REG_TABLE_END,
 146 };
 147
 148 static int exynos_irq_set_wake(struct irq_data *data, unsigned int state)
 149 {
 150         const struct exynos_wkup_irq *wkup_irq;
 151
 152         if (!pm_data->wkup_irq)
 153                 return -ENOENT;
 154         wkup_irq = pm_data->wkup_irq;
 155
 156         while (wkup_irq->mask) {
 157                 if (wkup_irq->hwirq == data->hwirq) {
 158                         if (!state)
 159                                 exynos_irqwake_intmask |= wkup_irq->mask;
 160                         else
 161                                 exynos_irqwake_intmask &= ~wkup_irq->mask;
 162                         return 0;
 163                 }
 164                 ++wkup_irq;
 165         }
 166
 167         return -ENOENT;
 168 }
 169
 170 static struct irq_chip exynos_pmu_chip = {
 171         .name                   = "PMU",
 172         .irq_eoi                = irq_chip_eoi_parent,
 173         .irq_mask               = irq_chip_mask_parent,
 174         .irq_unmask             = irq_chip_unmask_parent,
 175         .irq_retrigger          = irq_chip_retrigger_hierarchy,
 176         .irq_set_wake           = exynos_irq_set_wake,
 177 #ifdef CONFIG_SMP
 178         .irq_set_affinity       = irq_chip_set_affinity_parent,
 179 #endif
 180 };
 181
 182 static int exynos_pmu_domain_xlate(struct irq_domain *domain,
 183                                    struct device_node *controller,
 184                                    const u32 *intspec,
 185                                    unsigned int intsize,
 186                                    unsigned long *out_hwirq,
 187                                    unsigned int *out_type)
 188 {
 189         if (domain->of_node != controller)
 190                 return -EINVAL; /* Shouldn't happen, really... */
 191         if (intsize != 3)
 192                 return -EINVAL; /* Not GIC compliant */
 193         if (intspec[0] != 0)
 194                 return -EINVAL; /* No PPI should point to this domain */
 195
 196         *out_hwirq = intspec[1];
 197         *out_type = intspec[2];
 198         return 0;
 199 }
 200
 201 static int exynos_pmu_domain_alloc(struct irq_domain *domain,
 202                                    unsigned int virq,
 203                                    unsigned int nr_irqs, void *data)
 204 {
 205         struct of_phandle_args *args = data;
 206         struct of_phandle_args parent_args;
 207         irq_hw_number_t hwirq;
 208         int i;
 209
 210         if (args->args_count != 3)
 211                 return -EINVAL; /* Not GIC compliant */
 212         if (args->args[0] != 0)
 213                 return -EINVAL; /* No PPI should point to this domain */
 214
 215         hwirq = args->args[1];
 216
 217         for (i = 0; i < nr_irqs; i++)
 218                 irq_domain_set_hwirq_and_chip(domain, virq + i, hwirq + i,
 219                                               &exynos_pmu_chip, NULL);
 220
 221         parent_args = *args;
 222         parent_args.np = domain->parent->of_node;
 223         return irq_domain_alloc_irqs_parent(domain, virq, nr_irqs, &parent_args);
 224 }
 225
 226 static struct irq_domain_ops exynos_pmu_domain_ops = {
 227         .xlate  = exynos_pmu_domain_xlate,
 228         .alloc  = exynos_pmu_domain_alloc,
 229         .free   = irq_domain_free_irqs_common,
 230 };
 231
 232 static int __init exynos_pmu_irq_init(struct device_node *node,
 233                                       struct device_node *parent)
 234 {
 235         struct irq_domain *parent_domain, *domain;
 236
 237         if (!parent) {
 238                 pr_err("%s: no parent, giving up\n", node->full_name);
 239                 return -ENODEV;
 240         }
 241
 242         parent_domain = irq_find_host(parent);
 243         if (!parent_domain) {
 244                 pr_err("%s: unable to obtain parent domain\n", node->full_name);
 245                 return -ENXIO;
 246         }
 247
 248         pmu_base_addr = of_iomap(node, 0);
 249
 250         if (!pmu_base_addr) {
 251                 pr_err("%s: failed to find exynos pmu register\n",
 252                        node->full_name);
 253                 return -ENOMEM;
 254         }
 255
 256         domain = irq_domain_add_hierarchy(parent_domain, 0, 0,
 257                                           node, &exynos_pmu_domain_ops,
 258                                           NULL);
 259         if (!domain) {
 260                 iounmap(pmu_base_addr);
 261                 return -ENOMEM;
 262         }
 263
 264         return 0;
 265 }
 266
 267 #define EXYNOS_PMU_IRQ(symbol, name)    OF_DECLARE_2(irqchip, symbol, name, exynos_pmu_irq_init)
 268
 269 EXYNOS_PMU_IRQ(exynos3250_pmu_irq, "samsung,exynos3250-pmu");
 270 EXYNOS_PMU_IRQ(exynos4210_pmu_irq, "samsung,exynos4210-pmu");
 271 EXYNOS_PMU_IRQ(exynos4212_pmu_irq, "samsung,exynos4212-pmu");
 272 EXYNOS_PMU_IRQ(exynos4412_pmu_irq, "samsung,exynos4412-pmu");
 273 EXYNOS_PMU_IRQ(exynos4415_pmu_irq, "samsung,exynos4415-pmu");
 274 EXYNOS_PMU_IRQ(exynos5250_pmu_irq, "samsung,exynos5250-pmu");
 275 EXYNOS_PMU_IRQ(exynos5420_pmu_irq, "samsung,exynos5420-pmu");
 276
 277 static int exynos_cpu_do_idle(void)
 278 {
 279         /* issue the standby signal into the pm unit. */
 280         cpu_do_idle();
 281
 282         pr_info("Failed to suspend the system\n");
 283         return 1; /* Aborting suspend */
 284 }
 285 static void exynos_flush_cache_all(void)
 286 {
 287         flush_cache_all();
 288         outer_flush_all();
 289 }
 290
 291 static int exynos_cpu_suspend(unsigned long arg)
 292 {
 293         exynos_flush_cache_all();
 294         return exynos_cpu_do_idle();
 295 }
 296
 297 static int exynos3250_cpu_suspend(unsigned long arg)
 298 {
 299         flush_cache_all();
 300         return exynos_cpu_do_idle();
 301 }
 302
 303 static int exynos5420_cpu_suspend(unsigned long arg)
 304 {
 305         /* MCPM works with HW CPU identifiers */
 306         unsigned int mpidr = read_cpuid_mpidr();
 307         unsigned int cluster = MPIDR_AFFINITY_LEVEL(mpidr, 1);
 308         unsigned int cpu = MPIDR_AFFINITY_LEVEL(mpidr, 0);
 309
 310         __raw_writel(0x0, sysram_base_addr + EXYNOS5420_CPU_STATE);
 311
 312         if (IS_ENABLED(CONFIG_EXYNOS5420_MCPM)) {
 313                 mcpm_set_entry_vector(cpu, cluster, exynos_cpu_resume);
 314
 315                 /*
 316                  * Residency value passed to mcpm_cpu_suspend back-end
 317                  * has to be given clear semantics. Set to 0 as a
 318                  * temporary value.
 319                  */
 320                 mcpm_cpu_suspend(0);
 321         }
 322
 323         pr_info("Failed to suspend the system\n");
 324
 325         /* return value != 0 means failure */
 326         return 1;
 327 }
 328
 329 static void exynos_pm_set_wakeup_mask(void)
 330 {
 331         /* Set wake-up mask registers */
 332         pmu_raw_writel(exynos_get_eint_wake_mask(), S5P_EINT_WAKEUP_MASK);
 333         pmu_raw_writel(exynos_irqwake_intmask & ~(1 << 31), S5P_WAKEUP_MASK);
 334 }
 335
 336 static void exynos_pm_enter_sleep_mode(void)
 337 {
 338         /* Set value of power down register for sleep mode */
 339         exynos_sys_powerdown_conf(SYS_SLEEP);
 340         pmu_raw_writel(S5P_CHECK_SLEEP, S5P_INFORM1);
 341 }
 342
 343 static void exynos_pm_prepare(void)
 344 {
 345         exynos_set_delayed_reset_assertion(false);
 346
 347         /* Set wake-up mask registers */
 348         exynos_pm_set_wakeup_mask();
 349
 350         s3c_pm_do_save(exynos_core_save, ARRAY_SIZE(exynos_core_save));
 351
 352         exynos_pm_enter_sleep_mode();
 353
 354         /* ensure at least INFORM0 has the resume address */
 355         pmu_raw_writel(virt_to_phys(exynos_cpu_resume), S5P_INFORM0);
 356 }
 357
 358 static void exynos3250_pm_prepare(void)
 359 {
 360         unsigned int tmp;
 361
 362         /* Set wake-up mask registers */
 363         exynos_pm_set_wakeup_mask();
 364
 365         tmp = pmu_raw_readl(EXYNOS3_ARM_L2_OPTION);
 366         tmp &= ~EXYNOS5_OPTION_USE_RETENTION;
 367         pmu_raw_writel(tmp, EXYNOS3_ARM_L2_OPTION);
 368
 369         exynos_pm_enter_sleep_mode();
 370
 371         /* ensure at least INFORM0 has the resume address */
 372         pmu_raw_writel(virt_to_phys(exynos_cpu_resume), S5P_INFORM0);
 373 }
 374
 375 static void exynos5420_pm_prepare(void)
 376 {
 377         unsigned int tmp;
 378
 379         /* Set wake-up mask registers */
 380         exynos_pm_set_wakeup_mask();
 381
 382         s3c_pm_do_save(exynos_core_save, ARRAY_SIZE(exynos_core_save));
 383
 384         exynos_pmu_spare3 = pmu_raw_readl(S5P_PMU_SPARE3);
 385         /*
 386          * The cpu state needs to be saved and restored so that the
 387          * secondary CPUs will enter low power start. Though the U-Boot
 388          * is setting the cpu state with low power flag, the kernel
 389          * needs to restore it back in case, the primary cpu fails to
 390          * suspend for any reason.
 391          */
 392         exynos5420_cpu_state = __raw_readl(sysram_base_addr +
 393                                                 EXYNOS5420_CPU_STATE);
 394
 395         exynos_pm_enter_sleep_mode();
 396
 397         /* ensure at least INFORM0 has the resume address */
 398         if (IS_ENABLED(CONFIG_EXYNOS5420_MCPM))
 399                 pmu_raw_writel(virt_to_phys(mcpm_entry_point), S5P_INFORM0);
 400
 401         tmp = pmu_raw_readl(EXYNOS5_ARM_L2_OPTION);
 402         tmp &= ~EXYNOS5_USE_RETENTION;
 403         pmu_raw_writel(tmp, EXYNOS5_ARM_L2_OPTION);
 404
 405         tmp = pmu_raw_readl(EXYNOS5420_SFR_AXI_CGDIS1);
 406         tmp |= EXYNOS5420_UFS;
 407         pmu_raw_writel(tmp, EXYNOS5420_SFR_AXI_CGDIS1);
 408
 409         tmp = pmu_raw_readl(EXYNOS5420_ARM_COMMON_OPTION);
 410         tmp &= ~EXYNOS5420_L2RSTDISABLE_VALUE;
 411         pmu_raw_writel(tmp, EXYNOS5420_ARM_COMMON_OPTION);
 412
 413         tmp = pmu_raw_readl(EXYNOS5420_FSYS2_OPTION);
 414         tmp |= EXYNOS5420_EMULATION;
 415         pmu_raw_writel(tmp, EXYNOS5420_FSYS2_OPTION);
 416
 417         tmp = pmu_raw_readl(EXYNOS5420_PSGEN_OPTION);
 418         tmp |= EXYNOS5420_EMULATION;
 419         pmu_raw_writel(tmp, EXYNOS5420_PSGEN_OPTION);
 420 }
 421
 422
 423 static int exynos_pm_suspend(void)
 424 {
 425         exynos_pm_central_suspend();
 426
 427         /* Setting SEQ_OPTION register */
 428         pmu_raw_writel(S5P_USE_STANDBY_WFI0 | S5P_USE_STANDBY_WFE0,
 429                        S5P_CENTRAL_SEQ_OPTION);
 430
 431         if (read_cpuid_part() == ARM_CPU_PART_CORTEX_A9)
 432                 exynos_cpu_save_register();
 433
 434         return 0;
 435 }
 436
 437 static int exynos5420_pm_suspend(void)
 438 {
 439         u32 this_cluster;
 440
 441         exynos_pm_central_suspend();
 442
 443         /* Setting SEQ_OPTION register */
 444
 445         this_cluster = MPIDR_AFFINITY_LEVEL(read_cpuid_mpidr(), 1);
 446         if (!this_cluster)
 447                 pmu_raw_writel(EXYNOS5420_ARM_USE_STANDBY_WFI0,
 448                                 S5P_CENTRAL_SEQ_OPTION);
 449         else
 450                 pmu_raw_writel(EXYNOS5420_KFC_USE_STANDBY_WFI0,
 451                                 S5P_CENTRAL_SEQ_OPTION);
 452         return 0;
 453 }
 454
 455 static void exynos_pm_release_retention(void)
 456 {
 457         unsigned int i;
 458
 459         for (i = 0; (pm_data->release_ret_regs[i] != REG_TABLE_END); i++)
 460                 pmu_raw_writel(EXYNOS_WAKEUP_FROM_LOWPWR,
 461                                 pm_data->release_ret_regs[i]);
 462 }
 463
 464 static void exynos_pm_resume(void)
 465 {
 466         u32 cpuid = read_cpuid_part();
 467
 468         if (exynos_pm_central_resume())
 469                 goto early_wakeup;
 470
 471         /* For release retention */
 472         exynos_pm_release_retention();
 473
 474         s3c_pm_do_restore_core(exynos_core_save, ARRAY_SIZE(exynos_core_save));
 475
 476         if (cpuid == ARM_CPU_PART_CORTEX_A9)
 477                 scu_enable(S5P_VA_SCU);
 478
 479         if (call_firmware_op(resume) == -ENOSYS
 480             && cpuid == ARM_CPU_PART_CORTEX_A9)
 481                 exynos_cpu_restore_register();
 482
 483 early_wakeup:
 484
 485         /* Clear SLEEP mode set in INFORM1 */
 486         pmu_raw_writel(0x0, S5P_INFORM1);
 487         exynos_set_delayed_reset_assertion(true);
 488 }
 489
 490 static void exynos3250_pm_resume(void)
 491 {
 492         u32 cpuid = read_cpuid_part();
 493
 494         if (exynos_pm_central_resume())
 495                 goto early_wakeup;
 496
 497         /* For release retention */
 498         exynos_pm_release_retention();
 499
 500         pmu_raw_writel(S5P_USE_STANDBY_WFI_ALL, S5P_CENTRAL_SEQ_OPTION);
 501
 502         if (call_firmware_op(resume) == -ENOSYS
 503             && cpuid == ARM_CPU_PART_CORTEX_A9)
 504                 exynos_cpu_restore_register();
 505
 506 early_wakeup:
 507
 508         /* Clear SLEEP mode set in INFORM1 */
 509         pmu_raw_writel(0x0, S5P_INFORM1);
 510 }
 511
 512 static void exynos5420_prepare_pm_resume(void)
 513 {
 514         if (IS_ENABLED(CONFIG_EXYNOS5420_MCPM))
 515                 WARN_ON(mcpm_cpu_powered_up());
 516 }
 517
 518 static void exynos5420_pm_resume(void)
 519 {
 520         unsigned long tmp;
 521
 522         /* Restore the CPU0 low power state register */
 523         tmp = pmu_raw_readl(EXYNOS5_ARM_CORE0_SYS_PWR_REG);
 524         pmu_raw_writel(tmp | S5P_CORE_LOCAL_PWR_EN,
 525                 EXYNOS5_ARM_CORE0_SYS_PWR_REG);
 526
 527         /* Restore the sysram cpu state register */
 528         __raw_writel(exynos5420_cpu_state,
 529                 sysram_base_addr + EXYNOS5420_CPU_STATE);
 530
 531         pmu_raw_writel(EXYNOS5420_USE_STANDBY_WFI_ALL,
 532                         S5P_CENTRAL_SEQ_OPTION);
 533
 534         if (exynos_pm_central_resume())
 535                 goto early_wakeup;
 536
 537         /* For release retention */
 538         exynos_pm_release_retention();
 539
 540         pmu_raw_writel(exynos_pmu_spare3, S5P_PMU_SPARE3);
 541
 542         s3c_pm_do_restore_core(exynos_core_save, ARRAY_SIZE(exynos_core_save));
 543
 544 early_wakeup:
 545
 546         tmp = pmu_raw_readl(EXYNOS5420_SFR_AXI_CGDIS1);
 547         tmp &= ~EXYNOS5420_UFS;
 548         pmu_raw_writel(tmp, EXYNOS5420_SFR_AXI_CGDIS1);
 549
 550         tmp = pmu_raw_readl(EXYNOS5420_FSYS2_OPTION);
 551         tmp &= ~EXYNOS5420_EMULATION;
 552         pmu_raw_writel(tmp, EXYNOS5420_FSYS2_OPTION);
 553
 554         tmp = pmu_raw_readl(EXYNOS5420_PSGEN_OPTION);
 555         tmp &= ~EXYNOS5420_EMULATION;
 556         pmu_raw_writel(tmp, EXYNOS5420_PSGEN_OPTION);
 557
 558         /* Clear SLEEP mode set in INFORM1 */
 559         pmu_raw_writel(0x0, S5P_INFORM1);
 560 }
 561
 562 /*
 563  * Suspend Ops
 564  */
 565
 566 static int exynos_suspend_enter(suspend_state_t state)
 567 {
 568         int ret;
 569
 570         s3c_pm_debug_init();
 571
 572         S3C_PMDBG("%s: suspending the system...\n", __func__);
 573
 574         S3C_PMDBG("%s: wakeup masks: %08x,%08x\n", __func__,
 575                         exynos_irqwake_intmask, exynos_get_eint_wake_mask());
 576
 577         if (exynos_irqwake_intmask == -1U
 578             && exynos_get_eint_wake_mask() == -1U) {
 579                 pr_err("%s: No wake-up sources!\n", __func__);
 580                 pr_err("%s: Aborting sleep\n", __func__);
 581                 return -EINVAL;
 582         }
 583
 584         s3c_pm_save_uarts();
 585         if (pm_data->pm_prepare)
 586                 pm_data->pm_prepare();
 587         flush_cache_all();
 588         s3c_pm_check_store();
 589
 590         ret = call_firmware_op(suspend);
 591         if (ret == -ENOSYS)
 592                 ret = cpu_suspend(0, pm_data->cpu_suspend);
 593         if (ret)
 594                 return ret;
 595
 596         if (pm_data->pm_resume_prepare)
 597                 pm_data->pm_resume_prepare();
 598         s3c_pm_restore_uarts();
 599
 600         S3C_PMDBG("%s: wakeup stat: %08x\n", __func__,
 601                         pmu_raw_readl(S5P_WAKEUP_STAT));
 602
 603         s3c_pm_check_restore();
 604
 605         S3C_PMDBG("%s: resuming the system...\n", __func__);
 606
 607         return 0;
 608 }
 609
 610 static int exynos_suspend_prepare(void)
 611 {
 612         int ret;
 613
 614         /*
 615          * REVISIT: It would be better if struct platform_suspend_ops
 616          * .prepare handler get the suspend_state_t as a parameter to
 617          * avoid hard-coding the suspend to mem state. It's safe to do
 618          * it now only because the suspend_valid_only_mem function is
 619          * used as the .valid callback used to check if a given state
 620          * is supported by the platform anyways.
 621          */
 622         ret = regulator_suspend_prepare(PM_SUSPEND_MEM);
 623         if (ret) {
 624                 pr_err("Failed to prepare regulators for suspend (%d)\n", ret);
 625                 return ret;
 626         }
 627
 628         s3c_pm_check_prepare();
 629
 630         return 0;
 631 }
 632
 633 static void exynos_suspend_finish(void)
 634 {
 635         int ret;
 636
 637         s3c_pm_check_cleanup();
 638
 639         ret = regulator_suspend_finish();
 640         if (ret)
 641                 pr_warn("Failed to resume regulators from suspend (%d)\n", ret);
 642 }
 643
 644 static const struct platform_suspend_ops exynos_suspend_ops = {
 645         .enter          = exynos_suspend_enter,
 646         .prepare        = exynos_suspend_prepare,
 647         .finish         = exynos_suspend_finish,
 648         .valid          = suspend_valid_only_mem,
 649 };
 650
 651 static const struct exynos_pm_data exynos3250_pm_data = {
 652         .wkup_irq       = exynos3250_wkup_irq,
 653         .wake_disable_mask = ((0xFF << 8) | (0x1F << 1)),
 654         .release_ret_regs = exynos3250_release_ret_regs,
 655         .pm_suspend     = exynos_pm_suspend,
 656         .pm_resume      = exynos3250_pm_resume,
 657         .pm_prepare     = exynos3250_pm_prepare,
 658         .cpu_suspend    = exynos3250_cpu_suspend,
 659 };
 660
 661 static const struct exynos_pm_data exynos4_pm_data = {
 662         .wkup_irq       = exynos4_wkup_irq,
 663         .wake_disable_mask = ((0xFF << 8) | (0x1F << 1)),
 664         .release_ret_regs = exynos_release_ret_regs,
 665         .pm_suspend     = exynos_pm_suspend,
 666         .pm_resume      = exynos_pm_resume,
 667         .pm_prepare     = exynos_pm_prepare,
 668         .cpu_suspend    = exynos_cpu_suspend,
 669 };
 670
 671 static const struct exynos_pm_data exynos5250_pm_data = {
 672         .wkup_irq       = exynos5250_wkup_irq,
 673         .wake_disable_mask = ((0xFF << 8) | (0x1F << 1)),
 674         .release_ret_regs = exynos_release_ret_regs,
 675         .pm_suspend     = exynos_pm_suspend,
 676         .pm_resume      = exynos_pm_resume,
 677         .pm_prepare     = exynos_pm_prepare,
 678         .cpu_suspend    = exynos_cpu_suspend,
 679 };
 680
 681 static const struct exynos_pm_data exynos5420_pm_data = {
 682         .wkup_irq       = exynos5250_wkup_irq,
 683         .wake_disable_mask = (0x7F << 7) | (0x1F << 1),
 684         .release_ret_regs = exynos5420_release_ret_regs,
 685         .pm_resume_prepare = exynos5420_prepare_pm_resume,
 686         .pm_resume      = exynos5420_pm_resume,
 687         .pm_suspend     = exynos5420_pm_suspend,
 688         .pm_prepare     = exynos5420_pm_prepare,
 689         .cpu_suspend    = exynos5420_cpu_suspend,
 690 };
 691
 692 static const struct of_device_id exynos_pmu_of_device_ids[] __initconst = {
 693         {
 694                 .compatible = "samsung,exynos3250-pmu",
 695                 .data = &exynos3250_pm_data,
 696         }, {
 697                 .compatible = "samsung,exynos4210-pmu",
 698                 .data = &exynos4_pm_data,
 699         }, {
 700                 .compatible = "samsung,exynos4212-pmu",
 701                 .data = &exynos4_pm_data,
 702         }, {
 703                 .compatible = "samsung,exynos4412-pmu",
 704                 .data = &exynos4_pm_data,
 705         }, {
 706                 .compatible = "samsung,exynos5250-pmu",
 707                 .data = &exynos5250_pm_data,
 708         }, {
 709                 .compatible = "samsung,exynos5420-pmu",
 710                 .data = &exynos5420_pm_data,
 711         },
 712         { /*sentinel*/ },
 713 };
 714
 715 static struct syscore_ops exynos_pm_syscore_ops;
 716
 717 void __init exynos_pm_init(void)
 718 {
 719         const struct of_device_id *match;
 720         struct device_node *np;
 721         u32 tmp;
 722
 723         np = of_find_matching_node_and_match(NULL, exynos_pmu_of_device_ids, &match);
 724         if (!np) {
 725                 pr_err("Failed to find PMU node\n");
 726                 return;
 727         }
 728
 729         if (WARN_ON(!of_find_property(np, "interrupt-controller", NULL))) {
 730                 pr_warn("Outdated DT detected, suspend/resume will NOT work\n");
 731                 return;
 732         }
 733
 734         pm_data = (const struct exynos_pm_data *) match->data;
 735
 736         /* All wakeup disable */
 737         tmp = pmu_raw_readl(S5P_WAKEUP_MASK);
 738         tmp |= pm_data->wake_disable_mask;
 739         pmu_raw_writel(tmp, S5P_WAKEUP_MASK);
 740
 741         exynos_pm_syscore_ops.suspend   = pm_data->pm_suspend;
 742         exynos_pm_syscore_ops.resume    = pm_data->pm_resume;
 743
 744         register_syscore_ops(&exynos_pm_syscore_ops);
 745         suspend_set_ops(&exynos_suspend_ops);
 746 }