xref: /linux/arch/arm/mach-exynos/suspend.c (revision cdd5b5a9761fd66d17586e4f4ba6588c70e640ea)
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 "common.h"
34 #include "smc.h"
35 
36 #define REG_TABLE_END (-1U)
37 
38 #define EXYNOS5420_CPU_STATE	0x28
39 
40 /**
41  * struct exynos_wkup_irq - PMU IRQ to mask mapping
42  * @hwirq: Hardware IRQ signal of the PMU
43  * @mask: Mask in PMU wake-up mask register
44  */
45 struct exynos_wkup_irq {
46 	unsigned int hwirq;
47 	u32 mask;
48 };
49 
50 struct exynos_pm_data {
51 	const struct exynos_wkup_irq *wkup_irq;
52 	unsigned int wake_disable_mask;
53 
54 	void (*pm_prepare)(void);
55 	void (*pm_resume_prepare)(void);
56 	void (*pm_resume)(void);
57 	int (*pm_suspend)(void);
58 	int (*cpu_suspend)(unsigned long);
59 };
60 
61 /* Used only on Exynos542x/5800 */
62 struct exynos_pm_state {
63 	int cpu_state;
64 	unsigned int pmu_spare3;
65 	void __iomem *sysram_base;
66 	phys_addr_t sysram_phys;
67 	bool secure_firmware;
68 };
69 
70 static const struct exynos_pm_data *pm_data __ro_after_init;
71 static struct exynos_pm_state pm_state;
72 
73 /*
74  * GIC wake-up support
75  */
76 
77 static u32 exynos_irqwake_intmask = 0xffffffff;
78 
79 static const struct exynos_wkup_irq exynos3250_wkup_irq[] = {
80 	{ 73, BIT(1) }, /* RTC alarm */
81 	{ 74, BIT(2) }, /* RTC tick */
82 	{ /* sentinel */ },
83 };
84 
85 static const struct exynos_wkup_irq exynos4_wkup_irq[] = {
86 	{ 44, BIT(1) }, /* RTC alarm */
87 	{ 45, BIT(2) }, /* RTC tick */
88 	{ /* sentinel */ },
89 };
90 
91 static const struct exynos_wkup_irq exynos5250_wkup_irq[] = {
92 	{ 43, BIT(1) }, /* RTC alarm */
93 	{ 44, BIT(2) }, /* RTC tick */
94 	{ /* sentinel */ },
95 };
96 
exynos_read_eint_wakeup_mask(void)97 static u32 exynos_read_eint_wakeup_mask(void)
98 {
99 	return pmu_raw_readl(EXYNOS_EINT_WAKEUP_MASK);
100 }
101 
exynos_irq_set_wake(struct irq_data * data,unsigned int state)102 static int exynos_irq_set_wake(struct irq_data *data, unsigned int state)
103 {
104 	const struct exynos_wkup_irq *wkup_irq;
105 
106 	if (!pm_data->wkup_irq)
107 		return -ENOENT;
108 	wkup_irq = pm_data->wkup_irq;
109 
110 	while (wkup_irq->mask) {
111 		if (wkup_irq->hwirq == data->hwirq) {
112 			if (!state)
113 				exynos_irqwake_intmask |= wkup_irq->mask;
114 			else
115 				exynos_irqwake_intmask &= ~wkup_irq->mask;
116 			return 0;
117 		}
118 		++wkup_irq;
119 	}
120 
121 	return -ENOENT;
122 }
123 
124 static struct irq_chip exynos_pmu_chip = {
125 	.name			= "PMU",
126 	.irq_eoi		= irq_chip_eoi_parent,
127 	.irq_mask		= irq_chip_mask_parent,
128 	.irq_unmask		= irq_chip_unmask_parent,
129 	.irq_retrigger		= irq_chip_retrigger_hierarchy,
130 	.irq_set_wake		= exynos_irq_set_wake,
131 #ifdef CONFIG_SMP
132 	.irq_set_affinity	= irq_chip_set_affinity_parent,
133 #endif
134 };
135 
exynos_pmu_domain_translate(struct irq_domain * d,struct irq_fwspec * fwspec,unsigned long * hwirq,unsigned int * type)136 static int exynos_pmu_domain_translate(struct irq_domain *d,
137 				       struct irq_fwspec *fwspec,
138 				       unsigned long *hwirq,
139 				       unsigned int *type)
140 {
141 	if (is_of_node(fwspec->fwnode)) {
142 		if (fwspec->param_count != 3)
143 			return -EINVAL;
144 
145 		/* No PPI should point to this domain */
146 		if (fwspec->param[0] != 0)
147 			return -EINVAL;
148 
149 		*hwirq = fwspec->param[1];
150 		*type = fwspec->param[2];
151 		return 0;
152 	}
153 
154 	return -EINVAL;
155 }
156 
exynos_pmu_domain_alloc(struct irq_domain * domain,unsigned int virq,unsigned int nr_irqs,void * data)157 static int exynos_pmu_domain_alloc(struct irq_domain *domain,
158 				   unsigned int virq,
159 				   unsigned int nr_irqs, void *data)
160 {
161 	struct irq_fwspec *fwspec = data;
162 	struct irq_fwspec parent_fwspec;
163 	irq_hw_number_t hwirq;
164 	int i;
165 
166 	if (fwspec->param_count != 3)
167 		return -EINVAL;	/* Not GIC compliant */
168 	if (fwspec->param[0] != 0)
169 		return -EINVAL;	/* No PPI should point to this domain */
170 
171 	hwirq = fwspec->param[1];
172 
173 	for (i = 0; i < nr_irqs; i++)
174 		irq_domain_set_hwirq_and_chip(domain, virq + i, hwirq + i,
175 					      &exynos_pmu_chip, NULL);
176 
177 	parent_fwspec = *fwspec;
178 	parent_fwspec.fwnode = domain->parent->fwnode;
179 	return irq_domain_alloc_irqs_parent(domain, virq, nr_irqs,
180 					    &parent_fwspec);
181 }
182 
183 static const struct irq_domain_ops exynos_pmu_domain_ops = {
184 	.translate	= exynos_pmu_domain_translate,
185 	.alloc		= exynos_pmu_domain_alloc,
186 	.free		= irq_domain_free_irqs_common,
187 };
188 
exynos_pmu_irq_init(struct device_node * node,struct device_node * parent)189 static int __init exynos_pmu_irq_init(struct device_node *node,
190 				      struct device_node *parent)
191 {
192 	struct irq_domain *parent_domain, *domain;
193 
194 	if (!parent) {
195 		pr_err("%pOF: no parent, giving up\n", node);
196 		return -ENODEV;
197 	}
198 
199 	parent_domain = irq_find_host(parent);
200 	if (!parent_domain) {
201 		pr_err("%pOF: unable to obtain parent domain\n", node);
202 		return -ENXIO;
203 	}
204 
205 	pmu_base_addr = of_iomap(node, 0);
206 
207 	if (!pmu_base_addr) {
208 		pr_err("%pOF: failed to find exynos pmu register\n", node);
209 		return -ENOMEM;
210 	}
211 
212 	domain = irq_domain_add_hierarchy(parent_domain, 0, 0,
213 					  node, &exynos_pmu_domain_ops,
214 					  NULL);
215 	if (!domain) {
216 		iounmap(pmu_base_addr);
217 		pmu_base_addr = NULL;
218 		return -ENOMEM;
219 	}
220 
221 	/*
222 	 * Clear the OF_POPULATED flag set in of_irq_init so that
223 	 * later the Exynos PMU platform device won't be skipped.
224 	 */
225 	of_node_clear_flag(node, OF_POPULATED);
226 
227 	return 0;
228 }
229 
230 #define EXYNOS_PMU_IRQ(symbol, name)	IRQCHIP_DECLARE(symbol, name, exynos_pmu_irq_init)
231 
232 EXYNOS_PMU_IRQ(exynos3250_pmu_irq, "samsung,exynos3250-pmu");
233 EXYNOS_PMU_IRQ(exynos4210_pmu_irq, "samsung,exynos4210-pmu");
234 EXYNOS_PMU_IRQ(exynos4212_pmu_irq, "samsung,exynos4212-pmu");
235 EXYNOS_PMU_IRQ(exynos4412_pmu_irq, "samsung,exynos4412-pmu");
236 EXYNOS_PMU_IRQ(exynos5250_pmu_irq, "samsung,exynos5250-pmu");
237 EXYNOS_PMU_IRQ(exynos5420_pmu_irq, "samsung,exynos5420-pmu");
238 
exynos_cpu_do_idle(void)239 static int exynos_cpu_do_idle(void)
240 {
241 	/* issue the standby signal into the pm unit. */
242 	cpu_do_idle();
243 
244 	pr_info("Failed to suspend the system\n");
245 	return 1; /* Aborting suspend */
246 }
exynos_flush_cache_all(void)247 static void exynos_flush_cache_all(void)
248 {
249 	flush_cache_all();
250 	outer_flush_all();
251 }
252 
exynos_cpu_suspend(unsigned long arg)253 static int exynos_cpu_suspend(unsigned long arg)
254 {
255 	exynos_flush_cache_all();
256 	return exynos_cpu_do_idle();
257 }
258 
exynos3250_cpu_suspend(unsigned long arg)259 static int exynos3250_cpu_suspend(unsigned long arg)
260 {
261 	flush_cache_all();
262 	return exynos_cpu_do_idle();
263 }
264 
exynos5420_cpu_suspend(unsigned long arg)265 static int exynos5420_cpu_suspend(unsigned long arg)
266 {
267 	/* MCPM works with HW CPU identifiers */
268 	unsigned int mpidr = read_cpuid_mpidr();
269 	unsigned int cluster = MPIDR_AFFINITY_LEVEL(mpidr, 1);
270 	unsigned int cpu = MPIDR_AFFINITY_LEVEL(mpidr, 0);
271 
272 	if (IS_ENABLED(CONFIG_EXYNOS_MCPM)) {
273 		mcpm_set_entry_vector(cpu, cluster, exynos_cpu_resume);
274 		mcpm_cpu_suspend();
275 	}
276 
277 	pr_info("Failed to suspend the system\n");
278 
279 	/* return value != 0 means failure */
280 	return 1;
281 }
282 
exynos_pm_set_wakeup_mask(void)283 static void exynos_pm_set_wakeup_mask(void)
284 {
285 	/*
286 	 * Set wake-up mask registers
287 	 * EXYNOS_EINT_WAKEUP_MASK is set by pinctrl driver in late suspend.
288 	 */
289 	pmu_raw_writel(exynos_irqwake_intmask & ~BIT(31), S5P_WAKEUP_MASK);
290 }
291 
exynos_pm_enter_sleep_mode(void)292 static void exynos_pm_enter_sleep_mode(void)
293 {
294 	/* Set value of power down register for sleep mode */
295 	exynos_sys_powerdown_conf(SYS_SLEEP);
296 	pmu_raw_writel(EXYNOS_SLEEP_MAGIC, S5P_INFORM1);
297 }
298 
exynos_pm_prepare(void)299 static void exynos_pm_prepare(void)
300 {
301 	exynos_set_delayed_reset_assertion(false);
302 
303 	/* Set wake-up mask registers */
304 	exynos_pm_set_wakeup_mask();
305 
306 	exynos_pm_enter_sleep_mode();
307 
308 	/* ensure at least INFORM0 has the resume address */
309 	pmu_raw_writel(__pa_symbol(exynos_cpu_resume), S5P_INFORM0);
310 }
311 
exynos3250_pm_prepare(void)312 static void exynos3250_pm_prepare(void)
313 {
314 	unsigned int tmp;
315 
316 	/* Set wake-up mask registers */
317 	exynos_pm_set_wakeup_mask();
318 
319 	tmp = pmu_raw_readl(EXYNOS3_ARM_L2_OPTION);
320 	tmp &= ~EXYNOS5_OPTION_USE_RETENTION;
321 	pmu_raw_writel(tmp, EXYNOS3_ARM_L2_OPTION);
322 
323 	exynos_pm_enter_sleep_mode();
324 
325 	/* ensure at least INFORM0 has the resume address */
326 	pmu_raw_writel(__pa_symbol(exynos_cpu_resume), S5P_INFORM0);
327 }
328 
exynos5420_pm_prepare(void)329 static void exynos5420_pm_prepare(void)
330 {
331 	unsigned int tmp;
332 
333 	/* Set wake-up mask registers */
334 	exynos_pm_set_wakeup_mask();
335 
336 	pm_state.pmu_spare3 = pmu_raw_readl(S5P_PMU_SPARE3);
337 	/*
338 	 * The cpu state needs to be saved and restored so that the
339 	 * secondary CPUs will enter low power start. Though the U-Boot
340 	 * is setting the cpu state with low power flag, the kernel
341 	 * needs to restore it back in case, the primary cpu fails to
342 	 * suspend for any reason.
343 	 */
344 	pm_state.cpu_state = readl_relaxed(pm_state.sysram_base +
345 					   EXYNOS5420_CPU_STATE);
346 	writel_relaxed(0x0, pm_state.sysram_base + EXYNOS5420_CPU_STATE);
347 	if (pm_state.secure_firmware)
348 		exynos_smc(SMC_CMD_REG, SMC_REG_ID_SFR_W(pm_state.sysram_phys +
349 							 EXYNOS5420_CPU_STATE),
350 			   0, 0);
351 
352 	exynos_pm_enter_sleep_mode();
353 
354 	/* ensure at least INFORM0 has the resume address */
355 	if (IS_ENABLED(CONFIG_EXYNOS_MCPM))
356 		pmu_raw_writel(__pa_symbol(mcpm_entry_point), S5P_INFORM0);
357 
358 	tmp = pmu_raw_readl(EXYNOS_L2_OPTION(0));
359 	tmp &= ~EXYNOS_L2_USE_RETENTION;
360 	pmu_raw_writel(tmp, EXYNOS_L2_OPTION(0));
361 
362 	tmp = pmu_raw_readl(EXYNOS5420_SFR_AXI_CGDIS1);
363 	tmp |= EXYNOS5420_UFS;
364 	pmu_raw_writel(tmp, EXYNOS5420_SFR_AXI_CGDIS1);
365 
366 	tmp = pmu_raw_readl(EXYNOS5420_ARM_COMMON_OPTION);
367 	tmp &= ~EXYNOS5420_L2RSTDISABLE_VALUE;
368 	pmu_raw_writel(tmp, EXYNOS5420_ARM_COMMON_OPTION);
369 
370 	tmp = pmu_raw_readl(EXYNOS5420_FSYS2_OPTION);
371 	tmp |= EXYNOS5420_EMULATION;
372 	pmu_raw_writel(tmp, EXYNOS5420_FSYS2_OPTION);
373 
374 	tmp = pmu_raw_readl(EXYNOS5420_PSGEN_OPTION);
375 	tmp |= EXYNOS5420_EMULATION;
376 	pmu_raw_writel(tmp, EXYNOS5420_PSGEN_OPTION);
377 }
378 
379 
exynos_pm_suspend(void)380 static int exynos_pm_suspend(void)
381 {
382 	exynos_pm_central_suspend();
383 
384 	/* Setting SEQ_OPTION register */
385 	pmu_raw_writel(S5P_USE_STANDBY_WFI0 | S5P_USE_STANDBY_WFE0,
386 		       S5P_CENTRAL_SEQ_OPTION);
387 
388 	if (read_cpuid_part() == ARM_CPU_PART_CORTEX_A9)
389 		exynos_cpu_save_register();
390 
391 	return 0;
392 }
393 
exynos5420_pm_suspend(void)394 static int exynos5420_pm_suspend(void)
395 {
396 	u32 this_cluster;
397 
398 	exynos_pm_central_suspend();
399 
400 	/* Setting SEQ_OPTION register */
401 
402 	this_cluster = MPIDR_AFFINITY_LEVEL(read_cpuid_mpidr(), 1);
403 	if (!this_cluster)
404 		pmu_raw_writel(EXYNOS5420_ARM_USE_STANDBY_WFI0,
405 				S5P_CENTRAL_SEQ_OPTION);
406 	else
407 		pmu_raw_writel(EXYNOS5420_KFC_USE_STANDBY_WFI0,
408 				S5P_CENTRAL_SEQ_OPTION);
409 	return 0;
410 }
411 
exynos_pm_resume(void)412 static void exynos_pm_resume(void)
413 {
414 	u32 cpuid = read_cpuid_part();
415 
416 	if (exynos_pm_central_resume())
417 		goto early_wakeup;
418 
419 	if (cpuid == ARM_CPU_PART_CORTEX_A9)
420 		exynos_scu_enable();
421 
422 	if (call_firmware_op(resume) == -ENOSYS
423 	    && cpuid == ARM_CPU_PART_CORTEX_A9)
424 		exynos_cpu_restore_register();
425 
426 early_wakeup:
427 
428 	/* Clear SLEEP mode set in INFORM1 */
429 	pmu_raw_writel(0x0, S5P_INFORM1);
430 	exynos_set_delayed_reset_assertion(true);
431 }
432 
exynos3250_pm_resume(void)433 static void exynos3250_pm_resume(void)
434 {
435 	u32 cpuid = read_cpuid_part();
436 
437 	if (exynos_pm_central_resume())
438 		goto early_wakeup;
439 
440 	pmu_raw_writel(S5P_USE_STANDBY_WFI_ALL, S5P_CENTRAL_SEQ_OPTION);
441 
442 	if (call_firmware_op(resume) == -ENOSYS
443 	    && cpuid == ARM_CPU_PART_CORTEX_A9)
444 		exynos_cpu_restore_register();
445 
446 early_wakeup:
447 
448 	/* Clear SLEEP mode set in INFORM1 */
449 	pmu_raw_writel(0x0, S5P_INFORM1);
450 }
451 
exynos5420_prepare_pm_resume(void)452 static void exynos5420_prepare_pm_resume(void)
453 {
454 	unsigned int mpidr, cluster;
455 
456 	mpidr = read_cpuid_mpidr();
457 	cluster = MPIDR_AFFINITY_LEVEL(mpidr, 1);
458 
459 	if (IS_ENABLED(CONFIG_EXYNOS_MCPM))
460 		WARN_ON(mcpm_cpu_powered_up());
461 
462 	if (IS_ENABLED(CONFIG_HW_PERF_EVENTS) && cluster != 0) {
463 		/*
464 		 * When system is resumed on the LITTLE/KFC core (cluster 1),
465 		 * the DSCR is not properly updated until the power is turned
466 		 * on also for the cluster 0. Enable it for a while to
467 		 * propagate the SPNIDEN and SPIDEN signals from Secure JTAG
468 		 * block and avoid undefined instruction issue on CP14 reset.
469 		 */
470 		pmu_raw_writel(S5P_CORE_LOCAL_PWR_EN,
471 				EXYNOS_COMMON_CONFIGURATION(0));
472 		pmu_raw_writel(0,
473 				EXYNOS_COMMON_CONFIGURATION(0));
474 	}
475 }
476 
exynos5420_pm_resume(void)477 static void exynos5420_pm_resume(void)
478 {
479 	unsigned long tmp;
480 
481 	/* Restore the CPU0 low power state register */
482 	tmp = pmu_raw_readl(EXYNOS5_ARM_CORE0_SYS_PWR_REG);
483 	pmu_raw_writel(tmp | S5P_CORE_LOCAL_PWR_EN,
484 		       EXYNOS5_ARM_CORE0_SYS_PWR_REG);
485 
486 	/* Restore the sysram cpu state register */
487 	writel_relaxed(pm_state.cpu_state,
488 		       pm_state.sysram_base + EXYNOS5420_CPU_STATE);
489 	if (pm_state.secure_firmware)
490 		exynos_smc(SMC_CMD_REG,
491 			   SMC_REG_ID_SFR_W(pm_state.sysram_phys +
492 					    EXYNOS5420_CPU_STATE),
493 			   EXYNOS_AFTR_MAGIC, 0);
494 
495 	pmu_raw_writel(EXYNOS5420_USE_STANDBY_WFI_ALL,
496 			S5P_CENTRAL_SEQ_OPTION);
497 
498 	if (exynos_pm_central_resume())
499 		goto early_wakeup;
500 
501 	pmu_raw_writel(pm_state.pmu_spare3, S5P_PMU_SPARE3);
502 
503 early_wakeup:
504 
505 	tmp = pmu_raw_readl(EXYNOS5420_SFR_AXI_CGDIS1);
506 	tmp &= ~EXYNOS5420_UFS;
507 	pmu_raw_writel(tmp, EXYNOS5420_SFR_AXI_CGDIS1);
508 
509 	tmp = pmu_raw_readl(EXYNOS5420_FSYS2_OPTION);
510 	tmp &= ~EXYNOS5420_EMULATION;
511 	pmu_raw_writel(tmp, EXYNOS5420_FSYS2_OPTION);
512 
513 	tmp = pmu_raw_readl(EXYNOS5420_PSGEN_OPTION);
514 	tmp &= ~EXYNOS5420_EMULATION;
515 	pmu_raw_writel(tmp, EXYNOS5420_PSGEN_OPTION);
516 
517 	/* Clear SLEEP mode set in INFORM1 */
518 	pmu_raw_writel(0x0, S5P_INFORM1);
519 }
520 
521 /*
522  * Suspend Ops
523  */
524 
exynos_suspend_enter(suspend_state_t state)525 static int exynos_suspend_enter(suspend_state_t state)
526 {
527 	u32 eint_wakeup_mask = exynos_read_eint_wakeup_mask();
528 	int ret;
529 
530 	pr_debug("%s: suspending the system...\n", __func__);
531 
532 	pr_debug("%s: wakeup masks: %08x,%08x\n", __func__,
533 		  exynos_irqwake_intmask, eint_wakeup_mask);
534 
535 	if (exynos_irqwake_intmask == -1U
536 	    && eint_wakeup_mask == EXYNOS_EINT_WAKEUP_MASK_DISABLED) {
537 		pr_err("%s: No wake-up sources!\n", __func__);
538 		pr_err("%s: Aborting sleep\n", __func__);
539 		return -EINVAL;
540 	}
541 
542 	if (pm_data->pm_prepare)
543 		pm_data->pm_prepare();
544 	flush_cache_all();
545 
546 	ret = call_firmware_op(suspend);
547 	if (ret == -ENOSYS)
548 		ret = cpu_suspend(0, pm_data->cpu_suspend);
549 	if (ret)
550 		return ret;
551 
552 	if (pm_data->pm_resume_prepare)
553 		pm_data->pm_resume_prepare();
554 
555 	pr_debug("%s: wakeup stat: %08x\n", __func__,
556 			pmu_raw_readl(S5P_WAKEUP_STAT));
557 
558 	pr_debug("%s: resuming the system...\n", __func__);
559 
560 	return 0;
561 }
562 
exynos_suspend_prepare(void)563 static int exynos_suspend_prepare(void)
564 {
565 	int ret;
566 
567 	/*
568 	 * REVISIT: It would be better if struct platform_suspend_ops
569 	 * .prepare handler get the suspend_state_t as a parameter to
570 	 * avoid hard-coding the suspend to mem state. It's safe to do
571 	 * it now only because the suspend_valid_only_mem function is
572 	 * used as the .valid callback used to check if a given state
573 	 * is supported by the platform anyways.
574 	 */
575 	ret = regulator_suspend_prepare(PM_SUSPEND_MEM);
576 	if (ret) {
577 		pr_err("Failed to prepare regulators for suspend (%d)\n", ret);
578 		return ret;
579 	}
580 
581 	return 0;
582 }
583 
exynos_suspend_finish(void)584 static void exynos_suspend_finish(void)
585 {
586 	int ret;
587 
588 	ret = regulator_suspend_finish();
589 	if (ret)
590 		pr_warn("Failed to resume regulators from suspend (%d)\n", ret);
591 }
592 
593 static const struct platform_suspend_ops exynos_suspend_ops = {
594 	.enter		= exynos_suspend_enter,
595 	.prepare	= exynos_suspend_prepare,
596 	.finish		= exynos_suspend_finish,
597 	.valid		= suspend_valid_only_mem,
598 };
599 
600 static const struct exynos_pm_data exynos3250_pm_data = {
601 	.wkup_irq	= exynos3250_wkup_irq,
602 	.wake_disable_mask = ((0xFF << 8) | (0x1F << 1)),
603 	.pm_suspend	= exynos_pm_suspend,
604 	.pm_resume	= exynos3250_pm_resume,
605 	.pm_prepare	= exynos3250_pm_prepare,
606 	.cpu_suspend	= exynos3250_cpu_suspend,
607 };
608 
609 static const struct exynos_pm_data exynos4_pm_data = {
610 	.wkup_irq	= exynos4_wkup_irq,
611 	.wake_disable_mask = ((0xFF << 8) | (0x1F << 1)),
612 	.pm_suspend	= exynos_pm_suspend,
613 	.pm_resume	= exynos_pm_resume,
614 	.pm_prepare	= exynos_pm_prepare,
615 	.cpu_suspend	= exynos_cpu_suspend,
616 };
617 
618 static const struct exynos_pm_data exynos5250_pm_data = {
619 	.wkup_irq	= exynos5250_wkup_irq,
620 	.wake_disable_mask = ((0xFF << 8) | (0x1F << 1)),
621 	.pm_suspend	= exynos_pm_suspend,
622 	.pm_resume	= exynos_pm_resume,
623 	.pm_prepare	= exynos_pm_prepare,
624 	.cpu_suspend	= exynos_cpu_suspend,
625 };
626 
627 static const struct exynos_pm_data exynos5420_pm_data = {
628 	.wkup_irq	= exynos5250_wkup_irq,
629 	.wake_disable_mask = (0x7F << 7) | (0x1F << 1),
630 	.pm_resume_prepare = exynos5420_prepare_pm_resume,
631 	.pm_resume	= exynos5420_pm_resume,
632 	.pm_suspend	= exynos5420_pm_suspend,
633 	.pm_prepare	= exynos5420_pm_prepare,
634 	.cpu_suspend	= exynos5420_cpu_suspend,
635 };
636 
637 static const struct of_device_id exynos_pmu_of_device_ids[] __initconst = {
638 	{
639 		.compatible = "samsung,exynos3250-pmu",
640 		.data = &exynos3250_pm_data,
641 	}, {
642 		.compatible = "samsung,exynos4210-pmu",
643 		.data = &exynos4_pm_data,
644 	}, {
645 		.compatible = "samsung,exynos4212-pmu",
646 		.data = &exynos4_pm_data,
647 	}, {
648 		.compatible = "samsung,exynos4412-pmu",
649 		.data = &exynos4_pm_data,
650 	}, {
651 		.compatible = "samsung,exynos5250-pmu",
652 		.data = &exynos5250_pm_data,
653 	}, {
654 		.compatible = "samsung,exynos5420-pmu",
655 		.data = &exynos5420_pm_data,
656 	},
657 	{ /*sentinel*/ },
658 };
659 
660 static struct syscore_ops exynos_pm_syscore_ops;
661 
exynos_pm_init(void)662 void __init exynos_pm_init(void)
663 {
664 	const struct of_device_id *match;
665 	struct device_node *np;
666 	u32 tmp;
667 
668 	np = of_find_matching_node_and_match(NULL, exynos_pmu_of_device_ids, &match);
669 	if (!np) {
670 		pr_err("Failed to find PMU node\n");
671 		return;
672 	}
673 
674 	if (WARN_ON(!of_property_read_bool(np, "interrupt-controller"))) {
675 		pr_warn("Outdated DT detected, suspend/resume will NOT work\n");
676 		of_node_put(np);
677 		return;
678 	}
679 	of_node_put(np);
680 
681 	pm_data = (const struct exynos_pm_data *) match->data;
682 
683 	/* All wakeup disable */
684 	tmp = pmu_raw_readl(S5P_WAKEUP_MASK);
685 	tmp |= pm_data->wake_disable_mask;
686 	pmu_raw_writel(tmp, S5P_WAKEUP_MASK);
687 
688 	exynos_pm_syscore_ops.suspend	= pm_data->pm_suspend;
689 	exynos_pm_syscore_ops.resume	= pm_data->pm_resume;
690 
691 	register_syscore_ops(&exynos_pm_syscore_ops);
692 	suspend_set_ops(&exynos_suspend_ops);
693 
694 	/*
695 	 * Applicable as of now only to Exynos542x. If booted under secure
696 	 * firmware, the non-secure region of sysram should be used.
697 	 */
698 	if (exynos_secure_firmware_available()) {
699 		pm_state.sysram_phys = sysram_base_phys;
700 		pm_state.sysram_base = sysram_ns_base_addr;
701 		pm_state.secure_firmware = true;
702 	} else {
703 		pm_state.sysram_base = sysram_base_addr;
704 	}
705 }
706