Merge branch 'irqchip/gic' into irqchip/core

1 files changed, 66 insertions, 21 deletions

diff --git a/drivers/irqchip/irq-gic-v3.c b/drivers/irqchip/irq-gic-v3.c
index 9e3144975696..7247a3cc7ba1 100644
--- a/drivers/irqchip/irq-gic-v3.c
+++ b/drivers/irqchip/irq-gic-v3.c
@@ -16,6 +16,7 @@
  */
 
 #include <linux/cpu.h>
+#include <linux/cpu_pm.h>
 #include <linux/delay.h>
 #include <linux/interrupt.h>
 #include <linux/of.h>
@@ -155,7 +156,7 @@ static void gic_enable_sre(void)
 		pr_err("GIC: unable to set SRE (disabled at EL2), panic ahead\n");
 }
 
-static void gic_enable_redist(void)
+static void gic_enable_redist(bool enable)
 {
 	void __iomem *rbase;
 	u32 count = 1000000;	/* 1s! */
@@ -163,20 +164,30 @@ static void gic_enable_redist(void)
 
 	rbase = gic_data_rdist_rd_base();
 
-	/* Wake up this CPU redistributor */
 	val = readl_relaxed(rbase + GICR_WAKER);
-	val &= ~GICR_WAKER_ProcessorSleep;
+	if (enable)
+		/* Wake up this CPU redistributor */
+		val &= ~GICR_WAKER_ProcessorSleep;
+	else
+		val |= GICR_WAKER_ProcessorSleep;
 	writel_relaxed(val, rbase + GICR_WAKER);
 
-	while (readl_relaxed(rbase + GICR_WAKER) & GICR_WAKER_ChildrenAsleep) {
-		count--;
-		if (!count) {
-			pr_err_ratelimited("redist didn't wake up...\n");
-			return;
-		}
+	if (!enable) {		/* Check that GICR_WAKER is writeable */
+		val = readl_relaxed(rbase + GICR_WAKER);
+		if (!(val & GICR_WAKER_ProcessorSleep))
+			return;	/* No PM support in this redistributor */
+	}
+
+	while (count--) {
+		val = readl_relaxed(rbase + GICR_WAKER);
+		if (enable ^ (val & GICR_WAKER_ChildrenAsleep))
+			break;
 		cpu_relax();
 		udelay(1);
 	};
+	if (!count)
+		pr_err_ratelimited("redistributor failed to %s...\n",
+				   enable ? "wakeup" : "sleep");
 }
 
 /*
@@ -372,6 +383,21 @@ static int gic_populate_rdist(void)
 	return -ENODEV;
 }
 
+static void gic_cpu_sys_reg_init(void)
+{
+	/* Enable system registers */
+	gic_enable_sre();
+
+	/* Set priority mask register */
+	gic_write_pmr(DEFAULT_PMR_VALUE);
+
+	/* EOI deactivates interrupt too (mode 0) */
+	gic_write_ctlr(ICC_CTLR_EL1_EOImode_drop_dir);
+
+	/* ... and let's hit the road... */
+	gic_write_grpen1(1);
+}
+
 static void gic_cpu_init(void)
 {
 	void __iomem *rbase;
@@ -380,23 +406,14 @@ static void gic_cpu_init(void)
 	if (gic_populate_rdist())
 		return;
 
-	gic_enable_redist();
+	gic_enable_redist(true);
 
 	rbase = gic_data_rdist_sgi_base();
 
 	gic_cpu_config(rbase, gic_redist_wait_for_rwp);
 
-	/* Enable system registers */
-	gic_enable_sre();
-
-	/* Set priority mask register */
-	gic_write_pmr(DEFAULT_PMR_VALUE);
-
-	/* EOI deactivates interrupt too (mode 0) */
-	gic_write_ctlr(ICC_CTLR_EL1_EOImode_drop_dir);
-
-	/* ... and let's hit the road... */
-	gic_write_grpen1(1);
+	/* initialise system registers */
+	gic_cpu_sys_reg_init();
 }
 
 #ifdef CONFIG_SMP
@@ -532,6 +549,33 @@ static int gic_set_affinity(struct irq_data *d, const struct cpumask *mask_val,
 #define gic_smp_init()		do { } while(0)
 #endif
 
+#ifdef CONFIG_CPU_PM
+static int gic_cpu_pm_notifier(struct notifier_block *self,
+			       unsigned long cmd, void *v)
+{
+	if (cmd == CPU_PM_EXIT) {
+		gic_enable_redist(true);
+		gic_cpu_sys_reg_init();
+	} else if (cmd == CPU_PM_ENTER) {
+		gic_write_grpen1(0);
+		gic_enable_redist(false);
+	}
+	return NOTIFY_OK;
+}
+
+static struct notifier_block gic_cpu_pm_notifier_block = {
+	.notifier_call = gic_cpu_pm_notifier,
+};
+
+static void gic_cpu_pm_init(void)
+{
+	cpu_pm_register_notifier(&gic_cpu_pm_notifier_block);
+}
+
+#else
+static inline void gic_cpu_pm_init(void) { }
+#endif /* CONFIG_CPU_PM */
+
 static struct irq_chip gic_chip = {
 	.name			= "GICv3",
 	.irq_mask		= gic_mask_irq,
@@ -671,6 +715,7 @@ static int __init gic_of_init(struct device_node *node, struct device_node *pare
 	gic_smp_init();
 	gic_dist_init();
 	gic_cpu_init();
+	gic_cpu_pm_init();
 
 	return 0;