2 * Copyright (c) 2011-2014 Samsung Electronics Co., Ltd.
3 * http://www.samsung.com
5 * EXYNOS - Suspend support
7 * Based on arch/arm/mach-s3c2410/pm.c
8 * Copyright (c) 2006 Simtec Electronics
9 * Ben Dooks <ben@simtec.co.uk>
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.
16 #include <linux/init.h>
17 #include <linux/suspend.h>
18 #include <linux/syscore_ops.h>
19 #include <linux/cpu_pm.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>
30 #include <asm/cacheflush.h>
31 #include <asm/hardware/cache-l2x0.h>
32 #include <asm/firmware.h>
34 #include <asm/smp_scu.h>
35 #include <asm/suspend.h>
39 #include <plat/pm-common.h>
43 #define REG_TABLE_END (-1U)
45 #define EXYNOS5420_CPU_STATE 0x28
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
52 struct exynos_wkup_irq {
57 struct exynos_pm_data {
58 const struct exynos_wkup_irq *wkup_irq;
59 unsigned int wake_disable_mask;
61 void (*pm_prepare)(void);
62 void (*pm_resume_prepare)(void);
63 void (*pm_resume)(void);
64 int (*pm_suspend)(void);
65 int (*cpu_suspend)(unsigned long);
68 static const struct exynos_pm_data *pm_data __ro_after_init;
70 static int exynos5420_cpu_state;
71 static unsigned int exynos_pmu_spare3;
77 static u32 exynos_irqwake_intmask = 0xffffffff;
79 static const struct exynos_wkup_irq exynos3250_wkup_irq[] = {
80 { 73, BIT(1) }, /* RTC alarm */
81 { 74, BIT(2) }, /* RTC tick */
85 static const struct exynos_wkup_irq exynos4_wkup_irq[] = {
86 { 44, BIT(1) }, /* RTC alarm */
87 { 45, BIT(2) }, /* RTC tick */
91 static const struct exynos_wkup_irq exynos5250_wkup_irq[] = {
92 { 43, BIT(1) }, /* RTC alarm */
93 { 44, BIT(2) }, /* RTC tick */
97 static int exynos_irq_set_wake(struct irq_data *data, unsigned int state)
99 const struct exynos_wkup_irq *wkup_irq;
101 if (!pm_data->wkup_irq)
103 wkup_irq = pm_data->wkup_irq;
105 while (wkup_irq->mask) {
106 if (wkup_irq->hwirq == data->hwirq) {
108 exynos_irqwake_intmask |= wkup_irq->mask;
110 exynos_irqwake_intmask &= ~wkup_irq->mask;
119 static struct irq_chip exynos_pmu_chip = {
121 .irq_eoi = irq_chip_eoi_parent,
122 .irq_mask = irq_chip_mask_parent,
123 .irq_unmask = irq_chip_unmask_parent,
124 .irq_retrigger = irq_chip_retrigger_hierarchy,
125 .irq_set_wake = exynos_irq_set_wake,
127 .irq_set_affinity = irq_chip_set_affinity_parent,
131 static int exynos_pmu_domain_translate(struct irq_domain *d,
132 struct irq_fwspec *fwspec,
133 unsigned long *hwirq,
136 if (is_of_node(fwspec->fwnode)) {
137 if (fwspec->param_count != 3)
140 /* No PPI should point to this domain */
141 if (fwspec->param[0] != 0)
144 *hwirq = fwspec->param[1];
145 *type = fwspec->param[2];
152 static int exynos_pmu_domain_alloc(struct irq_domain *domain,
154 unsigned int nr_irqs, void *data)
156 struct irq_fwspec *fwspec = data;
157 struct irq_fwspec parent_fwspec;
158 irq_hw_number_t hwirq;
161 if (fwspec->param_count != 3)
162 return -EINVAL; /* Not GIC compliant */
163 if (fwspec->param[0] != 0)
164 return -EINVAL; /* No PPI should point to this domain */
166 hwirq = fwspec->param[1];
168 for (i = 0; i < nr_irqs; i++)
169 irq_domain_set_hwirq_and_chip(domain, virq + i, hwirq + i,
170 &exynos_pmu_chip, NULL);
172 parent_fwspec = *fwspec;
173 parent_fwspec.fwnode = domain->parent->fwnode;
174 return irq_domain_alloc_irqs_parent(domain, virq, nr_irqs,
178 static const struct irq_domain_ops exynos_pmu_domain_ops = {
179 .translate = exynos_pmu_domain_translate,
180 .alloc = exynos_pmu_domain_alloc,
181 .free = irq_domain_free_irqs_common,
184 static int __init exynos_pmu_irq_init(struct device_node *node,
185 struct device_node *parent)
187 struct irq_domain *parent_domain, *domain;
190 pr_err("%pOF: no parent, giving up\n", node);
194 parent_domain = irq_find_host(parent);
195 if (!parent_domain) {
196 pr_err("%pOF: unable to obtain parent domain\n", node);
200 pmu_base_addr = of_iomap(node, 0);
202 if (!pmu_base_addr) {
203 pr_err("%pOF: failed to find exynos pmu register\n", node);
207 domain = irq_domain_add_hierarchy(parent_domain, 0, 0,
208 node, &exynos_pmu_domain_ops,
211 iounmap(pmu_base_addr);
216 * Clear the OF_POPULATED flag set in of_irq_init so that
217 * later the Exynos PMU platform device won't be skipped.
219 of_node_clear_flag(node, OF_POPULATED);
224 #define EXYNOS_PMU_IRQ(symbol, name) IRQCHIP_DECLARE(symbol, name, exynos_pmu_irq_init)
226 EXYNOS_PMU_IRQ(exynos3250_pmu_irq, "samsung,exynos3250-pmu");
227 EXYNOS_PMU_IRQ(exynos4210_pmu_irq, "samsung,exynos4210-pmu");
228 EXYNOS_PMU_IRQ(exynos4412_pmu_irq, "samsung,exynos4412-pmu");
229 EXYNOS_PMU_IRQ(exynos5250_pmu_irq, "samsung,exynos5250-pmu");
230 EXYNOS_PMU_IRQ(exynos5420_pmu_irq, "samsung,exynos5420-pmu");
232 static int exynos_cpu_do_idle(void)
234 /* issue the standby signal into the pm unit. */
237 pr_info("Failed to suspend the system\n");
238 return 1; /* Aborting suspend */
240 static void exynos_flush_cache_all(void)
246 static int exynos_cpu_suspend(unsigned long arg)
248 exynos_flush_cache_all();
249 return exynos_cpu_do_idle();
252 static int exynos3250_cpu_suspend(unsigned long arg)
255 return exynos_cpu_do_idle();
258 static int exynos5420_cpu_suspend(unsigned long arg)
260 /* MCPM works with HW CPU identifiers */
261 unsigned int mpidr = read_cpuid_mpidr();
262 unsigned int cluster = MPIDR_AFFINITY_LEVEL(mpidr, 1);
263 unsigned int cpu = MPIDR_AFFINITY_LEVEL(mpidr, 0);
265 writel_relaxed(0x0, sysram_base_addr + EXYNOS5420_CPU_STATE);
267 if (IS_ENABLED(CONFIG_EXYNOS5420_MCPM)) {
268 mcpm_set_entry_vector(cpu, cluster, exynos_cpu_resume);
272 pr_info("Failed to suspend the system\n");
274 /* return value != 0 means failure */
278 static void exynos_pm_set_wakeup_mask(void)
280 /* Set wake-up mask registers */
281 pmu_raw_writel(exynos_get_eint_wake_mask(), S5P_EINT_WAKEUP_MASK);
282 pmu_raw_writel(exynos_irqwake_intmask & ~(1 << 31), S5P_WAKEUP_MASK);
285 static void exynos_pm_enter_sleep_mode(void)
287 /* Set value of power down register for sleep mode */
288 exynos_sys_powerdown_conf(SYS_SLEEP);
289 pmu_raw_writel(EXYNOS_SLEEP_MAGIC, S5P_INFORM1);
292 static void exynos_pm_prepare(void)
294 exynos_set_delayed_reset_assertion(false);
296 /* Set wake-up mask registers */
297 exynos_pm_set_wakeup_mask();
299 exynos_pm_enter_sleep_mode();
301 /* ensure at least INFORM0 has the resume address */
302 pmu_raw_writel(__pa_symbol(exynos_cpu_resume), S5P_INFORM0);
305 static void exynos3250_pm_prepare(void)
309 /* Set wake-up mask registers */
310 exynos_pm_set_wakeup_mask();
312 tmp = pmu_raw_readl(EXYNOS3_ARM_L2_OPTION);
313 tmp &= ~EXYNOS5_OPTION_USE_RETENTION;
314 pmu_raw_writel(tmp, EXYNOS3_ARM_L2_OPTION);
316 exynos_pm_enter_sleep_mode();
318 /* ensure at least INFORM0 has the resume address */
319 pmu_raw_writel(__pa_symbol(exynos_cpu_resume), S5P_INFORM0);
322 static void exynos5420_pm_prepare(void)
326 /* Set wake-up mask registers */
327 exynos_pm_set_wakeup_mask();
329 exynos_pmu_spare3 = pmu_raw_readl(S5P_PMU_SPARE3);
331 * The cpu state needs to be saved and restored so that the
332 * secondary CPUs will enter low power start. Though the U-Boot
333 * is setting the cpu state with low power flag, the kernel
334 * needs to restore it back in case, the primary cpu fails to
335 * suspend for any reason.
337 exynos5420_cpu_state = readl_relaxed(sysram_base_addr +
338 EXYNOS5420_CPU_STATE);
340 exynos_pm_enter_sleep_mode();
342 /* ensure at least INFORM0 has the resume address */
343 if (IS_ENABLED(CONFIG_EXYNOS5420_MCPM))
344 pmu_raw_writel(__pa_symbol(mcpm_entry_point), S5P_INFORM0);
346 tmp = pmu_raw_readl(EXYNOS_L2_OPTION(0));
347 tmp &= ~EXYNOS_L2_USE_RETENTION;
348 pmu_raw_writel(tmp, EXYNOS_L2_OPTION(0));
350 tmp = pmu_raw_readl(EXYNOS5420_SFR_AXI_CGDIS1);
351 tmp |= EXYNOS5420_UFS;
352 pmu_raw_writel(tmp, EXYNOS5420_SFR_AXI_CGDIS1);
354 tmp = pmu_raw_readl(EXYNOS5420_ARM_COMMON_OPTION);
355 tmp &= ~EXYNOS5420_L2RSTDISABLE_VALUE;
356 pmu_raw_writel(tmp, EXYNOS5420_ARM_COMMON_OPTION);
358 tmp = pmu_raw_readl(EXYNOS5420_FSYS2_OPTION);
359 tmp |= EXYNOS5420_EMULATION;
360 pmu_raw_writel(tmp, EXYNOS5420_FSYS2_OPTION);
362 tmp = pmu_raw_readl(EXYNOS5420_PSGEN_OPTION);
363 tmp |= EXYNOS5420_EMULATION;
364 pmu_raw_writel(tmp, EXYNOS5420_PSGEN_OPTION);
368 static int exynos_pm_suspend(void)
370 exynos_pm_central_suspend();
372 /* Setting SEQ_OPTION register */
373 pmu_raw_writel(S5P_USE_STANDBY_WFI0 | S5P_USE_STANDBY_WFE0,
374 S5P_CENTRAL_SEQ_OPTION);
376 if (read_cpuid_part() == ARM_CPU_PART_CORTEX_A9)
377 exynos_cpu_save_register();
382 static int exynos5420_pm_suspend(void)
386 exynos_pm_central_suspend();
388 /* Setting SEQ_OPTION register */
390 this_cluster = MPIDR_AFFINITY_LEVEL(read_cpuid_mpidr(), 1);
392 pmu_raw_writel(EXYNOS5420_ARM_USE_STANDBY_WFI0,
393 S5P_CENTRAL_SEQ_OPTION);
395 pmu_raw_writel(EXYNOS5420_KFC_USE_STANDBY_WFI0,
396 S5P_CENTRAL_SEQ_OPTION);
400 static void exynos_pm_resume(void)
402 u32 cpuid = read_cpuid_part();
404 if (exynos_pm_central_resume())
407 if (cpuid == ARM_CPU_PART_CORTEX_A9)
408 scu_enable(S5P_VA_SCU);
410 if (call_firmware_op(resume) == -ENOSYS
411 && cpuid == ARM_CPU_PART_CORTEX_A9)
412 exynos_cpu_restore_register();
416 /* Clear SLEEP mode set in INFORM1 */
417 pmu_raw_writel(0x0, S5P_INFORM1);
418 exynos_set_delayed_reset_assertion(true);
421 static void exynos3250_pm_resume(void)
423 u32 cpuid = read_cpuid_part();
425 if (exynos_pm_central_resume())
428 pmu_raw_writel(S5P_USE_STANDBY_WFI_ALL, S5P_CENTRAL_SEQ_OPTION);
430 if (call_firmware_op(resume) == -ENOSYS
431 && cpuid == ARM_CPU_PART_CORTEX_A9)
432 exynos_cpu_restore_register();
436 /* Clear SLEEP mode set in INFORM1 */
437 pmu_raw_writel(0x0, S5P_INFORM1);
440 static void exynos5420_prepare_pm_resume(void)
442 if (IS_ENABLED(CONFIG_EXYNOS5420_MCPM))
443 WARN_ON(mcpm_cpu_powered_up());
446 static void exynos5420_pm_resume(void)
450 /* Restore the CPU0 low power state register */
451 tmp = pmu_raw_readl(EXYNOS5_ARM_CORE0_SYS_PWR_REG);
452 pmu_raw_writel(tmp | S5P_CORE_LOCAL_PWR_EN,
453 EXYNOS5_ARM_CORE0_SYS_PWR_REG);
455 /* Restore the sysram cpu state register */
456 writel_relaxed(exynos5420_cpu_state,
457 sysram_base_addr + EXYNOS5420_CPU_STATE);
459 pmu_raw_writel(EXYNOS5420_USE_STANDBY_WFI_ALL,
460 S5P_CENTRAL_SEQ_OPTION);
462 if (exynos_pm_central_resume())
465 pmu_raw_writel(exynos_pmu_spare3, S5P_PMU_SPARE3);
469 tmp = pmu_raw_readl(EXYNOS5420_SFR_AXI_CGDIS1);
470 tmp &= ~EXYNOS5420_UFS;
471 pmu_raw_writel(tmp, EXYNOS5420_SFR_AXI_CGDIS1);
473 tmp = pmu_raw_readl(EXYNOS5420_FSYS2_OPTION);
474 tmp &= ~EXYNOS5420_EMULATION;
475 pmu_raw_writel(tmp, EXYNOS5420_FSYS2_OPTION);
477 tmp = pmu_raw_readl(EXYNOS5420_PSGEN_OPTION);
478 tmp &= ~EXYNOS5420_EMULATION;
479 pmu_raw_writel(tmp, EXYNOS5420_PSGEN_OPTION);
481 /* Clear SLEEP mode set in INFORM1 */
482 pmu_raw_writel(0x0, S5P_INFORM1);
489 static int exynos_suspend_enter(suspend_state_t state)
495 S3C_PMDBG("%s: suspending the system...\n", __func__);
497 S3C_PMDBG("%s: wakeup masks: %08x,%08x\n", __func__,
498 exynos_irqwake_intmask, exynos_get_eint_wake_mask());
500 if (exynos_irqwake_intmask == -1U
501 && exynos_get_eint_wake_mask() == -1U) {
502 pr_err("%s: No wake-up sources!\n", __func__);
503 pr_err("%s: Aborting sleep\n", __func__);
508 if (pm_data->pm_prepare)
509 pm_data->pm_prepare();
511 s3c_pm_check_store();
513 ret = call_firmware_op(suspend);
515 ret = cpu_suspend(0, pm_data->cpu_suspend);
519 if (pm_data->pm_resume_prepare)
520 pm_data->pm_resume_prepare();
521 s3c_pm_restore_uarts();
523 S3C_PMDBG("%s: wakeup stat: %08x\n", __func__,
524 pmu_raw_readl(S5P_WAKEUP_STAT));
526 s3c_pm_check_restore();
528 S3C_PMDBG("%s: resuming the system...\n", __func__);
533 static int exynos_suspend_prepare(void)
538 * REVISIT: It would be better if struct platform_suspend_ops
539 * .prepare handler get the suspend_state_t as a parameter to
540 * avoid hard-coding the suspend to mem state. It's safe to do
541 * it now only because the suspend_valid_only_mem function is
542 * used as the .valid callback used to check if a given state
543 * is supported by the platform anyways.
545 ret = regulator_suspend_prepare(PM_SUSPEND_MEM);
547 pr_err("Failed to prepare regulators for suspend (%d)\n", ret);
551 s3c_pm_check_prepare();
556 static void exynos_suspend_finish(void)
560 s3c_pm_check_cleanup();
562 ret = regulator_suspend_finish();
564 pr_warn("Failed to resume regulators from suspend (%d)\n", ret);
567 static const struct platform_suspend_ops exynos_suspend_ops = {
568 .enter = exynos_suspend_enter,
569 .prepare = exynos_suspend_prepare,
570 .finish = exynos_suspend_finish,
571 .valid = suspend_valid_only_mem,
574 static const struct exynos_pm_data exynos3250_pm_data = {
575 .wkup_irq = exynos3250_wkup_irq,
576 .wake_disable_mask = ((0xFF << 8) | (0x1F << 1)),
577 .pm_suspend = exynos_pm_suspend,
578 .pm_resume = exynos3250_pm_resume,
579 .pm_prepare = exynos3250_pm_prepare,
580 .cpu_suspend = exynos3250_cpu_suspend,
583 static const struct exynos_pm_data exynos4_pm_data = {
584 .wkup_irq = exynos4_wkup_irq,
585 .wake_disable_mask = ((0xFF << 8) | (0x1F << 1)),
586 .pm_suspend = exynos_pm_suspend,
587 .pm_resume = exynos_pm_resume,
588 .pm_prepare = exynos_pm_prepare,
589 .cpu_suspend = exynos_cpu_suspend,
592 static const struct exynos_pm_data exynos5250_pm_data = {
593 .wkup_irq = exynos5250_wkup_irq,
594 .wake_disable_mask = ((0xFF << 8) | (0x1F << 1)),
595 .pm_suspend = exynos_pm_suspend,
596 .pm_resume = exynos_pm_resume,
597 .pm_prepare = exynos_pm_prepare,
598 .cpu_suspend = exynos_cpu_suspend,
601 static const struct exynos_pm_data exynos5420_pm_data = {
602 .wkup_irq = exynos5250_wkup_irq,
603 .wake_disable_mask = (0x7F << 7) | (0x1F << 1),
604 .pm_resume_prepare = exynos5420_prepare_pm_resume,
605 .pm_resume = exynos5420_pm_resume,
606 .pm_suspend = exynos5420_pm_suspend,
607 .pm_prepare = exynos5420_pm_prepare,
608 .cpu_suspend = exynos5420_cpu_suspend,
611 static const struct of_device_id exynos_pmu_of_device_ids[] __initconst = {
613 .compatible = "samsung,exynos3250-pmu",
614 .data = &exynos3250_pm_data,
616 .compatible = "samsung,exynos4210-pmu",
617 .data = &exynos4_pm_data,
619 .compatible = "samsung,exynos4412-pmu",
620 .data = &exynos4_pm_data,
622 .compatible = "samsung,exynos5250-pmu",
623 .data = &exynos5250_pm_data,
625 .compatible = "samsung,exynos5420-pmu",
626 .data = &exynos5420_pm_data,
631 static struct syscore_ops exynos_pm_syscore_ops;
633 void __init exynos_pm_init(void)
635 const struct of_device_id *match;
636 struct device_node *np;
639 np = of_find_matching_node_and_match(NULL, exynos_pmu_of_device_ids, &match);
641 pr_err("Failed to find PMU node\n");
645 if (WARN_ON(!of_find_property(np, "interrupt-controller", NULL))) {
646 pr_warn("Outdated DT detected, suspend/resume will NOT work\n");
650 pm_data = (const struct exynos_pm_data *) match->data;
652 /* All wakeup disable */
653 tmp = pmu_raw_readl(S5P_WAKEUP_MASK);
654 tmp |= pm_data->wake_disable_mask;
655 pmu_raw_writel(tmp, S5P_WAKEUP_MASK);
657 exynos_pm_syscore_ops.suspend = pm_data->pm_suspend;
658 exynos_pm_syscore_ops.resume = pm_data->pm_resume;
660 register_syscore_ops(&exynos_pm_syscore_ops);
661 suspend_set_ops(&exynos_suspend_ops);