ARM: EXYNOS: Refactor the pm code to use DT based lookup

Refactoring the pm.c to avoid using "soc_is_exynos" checks,
instead use the DT based lookup.

While at it, consolidate the common code across SoCs
and create static helper functions.
Signed-off-by: Vikas Sajjan <vikas.sajjan@samsung.com>
Reviewed-by: Tomasz Figa <t.figa@samsung.com>
Signed-off-by: Kukjin Kim <kgene.kim@samsung.com>

arch/arm/mach-exynos/pm.c

@@ -36,6 +36,8 @@
 #include "regs-pmu.h"
 #include "regs-sys.h"
 
+#define REG_TABLE_END (-1U)
+
 /**
  * struct exynos_wkup_irq - Exynos GIC to PMU IRQ mapping
  * @hwirq: Hardware IRQ signal of the GIC
@@ -59,6 +61,21 @@ static struct sleep_save exynos_core_save[] = {
 	SAVE_ITEM(S5P_SROM_BC3),
 };
 
+struct exynos_pm_data {
+	const struct exynos_wkup_irq *wkup_irq;
+	struct sleep_save *extra_save;
+	int num_extra_save;
+	unsigned int wake_disable_mask;
+	unsigned int *release_ret_regs;
+
+	void (*pm_prepare)(void);
+	void (*pm_resume)(void);
+	int (*pm_suspend)(void);
+	int (*cpu_suspend)(unsigned long);
+};
+
+struct exynos_pm_data *pm_data;
+
 /*
  * GIC wake-up support
  */
@@ -77,14 +94,24 @@ static const struct exynos_wkup_irq exynos5250_wkup_irq[] = {
 	{ /* sentinel */ },
 };
 
+unsigned int exynos_release_ret_regs[] = {
+	S5P_PAD_RET_MAUDIO_OPTION,
+	S5P_PAD_RET_GPIO_OPTION,
+	S5P_PAD_RET_UART_OPTION,
+	S5P_PAD_RET_MMCA_OPTION,
+	S5P_PAD_RET_MMCB_OPTION,
+	S5P_PAD_RET_EBIA_OPTION,
+	S5P_PAD_RET_EBIB_OPTION,
+	REG_TABLE_END,
+};
+
 static int exynos_irq_set_wake(struct irq_data *data, unsigned int state)
 {
 	const struct exynos_wkup_irq *wkup_irq;
 
-	if (soc_is_exynos5250())
-		wkup_irq = exynos5250_wkup_irq;
-	else
-		wkup_irq = exynos4_wkup_irq;
+	if (!pm_data->wkup_irq)
+		return -ENOENT;
+	wkup_irq = pm_data->wkup_irq;
 
 	while (wkup_irq->mask) {
 		if (wkup_irq->hwirq == data->hwirq) {
@@ -229,15 +256,8 @@ void exynos_enter_aftr(void)
 	cpu_pm_exit();
 }
 
-static int exynos_cpu_suspend(unsigned long arg)
+static int exynos_cpu_do_idle(void)
 {
-#ifdef CONFIG_CACHE_L2X0
-	outer_flush_all();
-#endif
-
-	if (soc_is_exynos5250())
-		flush_cache_all();
-
 	/* issue the standby signal into the pm unit. */
 	cpu_do_idle();
 
@@ -245,29 +265,44 @@ static int exynos_cpu_suspend(unsigned long arg)
 	return 1; /* Aborting suspend */
 }
 
-static void exynos_pm_prepare(void)
+static int exynos_cpu_suspend(unsigned long arg)
 {
-	unsigned int tmp;
+	flush_cache_all();
+	outer_flush_all();
+	return exynos_cpu_do_idle();
+}
 
+static void exynos_pm_set_wakeup_mask(void)
+{
 	/* Set wake-up mask registers */
 	pmu_raw_writel(exynos_get_eint_wake_mask(), S5P_EINT_WAKEUP_MASK);
 	pmu_raw_writel(exynos_irqwake_intmask & ~(1 << 31), S5P_WAKEUP_MASK);
+}
 
-	s3c_pm_do_save(exynos_core_save, ARRAY_SIZE(exynos_core_save));
-
-	if (soc_is_exynos5250())
-		s3c_pm_do_save(exynos5_sys_save, ARRAY_SIZE(exynos5_sys_save));
-
+static void exynos_pm_enter_sleep_mode(void)
+{
 	/* Set value of power down register for sleep mode */
-
 	exynos_sys_powerdown_conf(SYS_SLEEP);
 	pmu_raw_writel(S5P_CHECK_SLEEP, S5P_INFORM1);
 
 	/* ensure at least INFORM0 has the resume address */
-
 	pmu_raw_writel(virt_to_phys(exynos_cpu_resume), S5P_INFORM0);
 }
 
+static void exynos_pm_prepare(void)
+{
+	/* Set wake-up mask registers */
+	exynos_pm_set_wakeup_mask();
+
+	s3c_pm_do_save(exynos_core_save, ARRAY_SIZE(exynos_core_save));
+
+	 if (pm_data->extra_save)
+		s3c_pm_do_save(pm_data->extra_save,
+				pm_data->num_extra_save);
+
+	exynos_pm_enter_sleep_mode();
+}
+
 static int exynos_pm_suspend(void)
 {
 	unsigned long tmp;
@@ -285,6 +320,15 @@ static int exynos_pm_suspend(void)
 	return 0;
 }
 
+static void exynos_pm_release_retention(void)
+{
+	unsigned int i;
+
+	for (i = 0; (pm_data->release_ret_regs[i] != REG_TABLE_END); i++)
+		pmu_raw_writel(EXYNOS_WAKEUP_FROM_LOWPWR,
+				pm_data->release_ret_regs[i]);
+}
+
 static void exynos_pm_resume(void)
 {
 	if (exynos_pm_central_resume())
@@ -294,18 +338,11 @@ static void exynos_pm_resume(void)
 		exynos_cpu_restore_register();
 
 	/* For release retention */
+	exynos_pm_release_retention();
 
-	pmu_raw_writel((1 << 28), S5P_PAD_RET_MAUDIO_OPTION);
-	pmu_raw_writel((1 << 28), S5P_PAD_RET_GPIO_OPTION);
-	pmu_raw_writel((1 << 28), S5P_PAD_RET_UART_OPTION);
-	pmu_raw_writel((1 << 28), S5P_PAD_RET_MMCA_OPTION);
-	pmu_raw_writel((1 << 28), S5P_PAD_RET_MMCB_OPTION);
-	pmu_raw_writel((1 << 28), S5P_PAD_RET_EBIA_OPTION);
-	pmu_raw_writel((1 << 28), S5P_PAD_RET_EBIB_OPTION);
-
-	if (soc_is_exynos5250())
-		s3c_pm_do_restore(exynos5_sys_save,
-			ARRAY_SIZE(exynos5_sys_save));
+	if (pm_data->extra_save)
+		s3c_pm_do_restore_core(pm_data->extra_save,
+					pm_data->num_extra_save);
 
 	s3c_pm_do_restore_core(exynos_core_save, ARRAY_SIZE(exynos_core_save));
 
@@ -316,15 +353,8 @@ static void exynos_pm_resume(void)
 
 	/* Clear SLEEP mode set in INFORM1 */
 	pmu_raw_writel(0x0, S5P_INFORM1);
-
-	return;
 }
 
-static struct syscore_ops exynos_pm_syscore_ops = {
-	.suspend	= exynos_pm_suspend,
-	.resume		= exynos_pm_resume,
-};
-
 /*
  * Suspend Ops
  */
@@ -348,11 +378,12 @@ static int exynos_suspend_enter(suspend_state_t state)
 	}
 
 	s3c_pm_save_uarts();
-	exynos_pm_prepare();
+	if (pm_data->pm_prepare)
+		pm_data->pm_prepare();
 	flush_cache_all();
 	s3c_pm_check_store();
 
-	ret = cpu_suspend(0, exynos_cpu_suspend);
+	ret = cpu_suspend(0, pm_data->cpu_suspend);
 	if (ret)
 		return ret;
 
@@ -387,18 +418,70 @@ static const struct platform_suspend_ops exynos_suspend_ops = {
 	.valid		= suspend_valid_only_mem,
 };
 
+static const struct exynos_pm_data exynos4_pm_data = {
+	.wkup_irq	= exynos4_wkup_irq,
+	.wake_disable_mask = ((0xFF << 8) | (0x1F << 1)),
+	.release_ret_regs = exynos_release_ret_regs,
+	.pm_suspend	= exynos_pm_suspend,
+	.pm_resume	= exynos_pm_resume,
+	.pm_prepare	= exynos_pm_prepare,
+	.cpu_suspend	= exynos_cpu_suspend,
+};
+
+static const struct exynos_pm_data exynos5250_pm_data = {
+	.wkup_irq	= exynos5250_wkup_irq,
+	.wake_disable_mask = ((0xFF << 8) | (0x1F << 1)),
+	.release_ret_regs = exynos_release_ret_regs,
+	.extra_save	= exynos5_sys_save,
+	.num_extra_save	= ARRAY_SIZE(exynos5_sys_save),
+	.pm_suspend	= exynos_pm_suspend,
+	.pm_resume	= exynos_pm_resume,
+	.pm_prepare	= exynos_pm_prepare,
+	.cpu_suspend	= exynos_cpu_suspend,
+};
+
+static struct of_device_id exynos_pmu_of_device_ids[] = {
+	{
+		.compatible = "samsung,exynos4210-pmu",
+		.data = &exynos4_pm_data,
+	}, {
+		.compatible = "samsung,exynos4212-pmu",
+		.data = &exynos4_pm_data,
+	}, {
+		.compatible = "samsung,exynos4412-pmu",
+		.data = &exynos4_pm_data,
+	}, {
+		.compatible = "samsung,exynos5250-pmu",
+		.data = &exynos5250_pm_data,
+	},
+	{ /*sentinel*/ },
+};
+
+static struct syscore_ops exynos_pm_syscore_ops;
+
 void __init exynos_pm_init(void)
 {
+	const struct of_device_id *match;
 	u32 tmp;
 
+	of_find_matching_node_and_match(NULL, exynos_pmu_of_device_ids, &match);
+	if (!match) {
+		pr_err("Failed to find PMU node\n");
+		return;
+	}
+	pm_data = (struct exynos_pm_data *) match->data;
+
 	/* Platform-specific GIC callback */
 	gic_arch_extn.irq_set_wake = exynos_irq_set_wake;
 
 	/* All wakeup disable */
 	tmp = pmu_raw_readl(S5P_WAKEUP_MASK);
-	tmp |= ((0xFF << 8) | (0x1F << 1));
+	tmp |= pm_data->wake_disable_mask;
 	pmu_raw_writel(tmp, S5P_WAKEUP_MASK);
 
+	exynos_pm_syscore_ops.suspend	= pm_data->pm_suspend;
+	exynos_pm_syscore_ops.resume	= pm_data->pm_resume;
+
 	register_syscore_ops(&exynos_pm_syscore_ops);
 	suspend_set_ops(&exynos_suspend_ops);
 }

arch/arm/mach-exynos/regs-pmu.h

@@ -21,6 +21,7 @@
 #define S5P_USE_STANDBY_WFI0			(1 << 16)
 #define S5P_USE_STANDBY_WFE0			(1 << 24)
 
+#define EXYNOS_WAKEUP_FROM_LOWPWR		(1 << 28)
 #define EXYNOS_SWRESET				0x0400
 #define EXYNOS5440_SWRESET			0x00C4