The interupt combiner registers need to be saved on suspend and restored
on resume or combiner-based intterupts won't work after resume.
Signed-off-by: Jonathan Kliegman <kliegs@xxxxxxxxxxxx>
---
arch/arm/mach-exynos/common.c | 74 +++++++++++++++++++++++++++++++++++++----
1 files changed, 67 insertions(+), 7 deletions(-)
diff --git a/arch/arm/mach-exynos/common.c b/arch/arm/mach-exynos/common.c
index 4eb39cd..af296e5 100644
--- a/arch/arm/mach-exynos/common.c
+++ b/arch/arm/mach-exynos/common.c
@@ -22,6 +22,7 @@
#include <linux/export.h>
#include <linux/irqdomain.h>
#include <linux/of_address.h>
+#include <linux/cpu_pm.h>
#include <asm/proc-fns.h>
#include <asm/exception.h>
@@ -405,10 +406,14 @@ struct combiner_chip_data {
unsigned int irq_offset;
unsigned int irq_mask;
void __iomem *base;
+#ifdef CONFIG_CPU_PM
+ bool saved_on;
+#endif
};
static struct irq_domain *combiner_irq_domain;
static struct combiner_chip_data combiner_data[MAX_COMBINER_NR];
+static unsigned int rt_max_combiner_nr;
static inline void __iomem *combiner_base(struct irq_data *data)
{
@@ -535,6 +540,55 @@ static int combiner_irq_domain_map(struct irq_domain *d, unsigned int irq,
return 0;
}
+#ifdef CONFIG_CPU_PM
+static void combiner_save(void)
+{
+ int i;
+
+ for (i = 0; i < rt_max_combiner_nr; i++) {
+ if (combiner_data[i].irq_mask &
+ __raw_readl(combiner_data[i].base + COMBINER_ENABLE_SET)) {
+ combiner_data[i].saved_on = true;
+ } else {
+ combiner_data[i].saved_on = false;
+ }
+ }
+}
+
+static void combiner_restore(void)
+{
+ int i;
+
+ for (i = 0; i < rt_max_combiner_nr; i++) {
+ if (!combiner_data[i].saved_on)
+ continue;
+
+ __raw_writel(combiner_data[i].irq_mask,
+ combiner_data[i].base + COMBINER_ENABLE_SET);
+ }
+}
+
+
+static int combiner_notifier(struct notifier_block *self, unsigned long cmd,
+ void *v)
+{
+ switch (cmd) {
+ case CPU_CLUSTER_PM_ENTER:
+ combiner_save();
+ break;
+ case CPU_CLSUTER_PM_EXIT:
+ combiner_restore();
+ break;
+ }
+
+ return NOTIFY_OK;
+}
+
+static struct notifier_block combiner_notifier_block = {
+ .notifier_call = combiner_notifier,
+};
+#endif
+
static struct irq_domain_ops combiner_irq_domain_ops = {
.xlate = combiner_irq_domain_xlate,
.map = combiner_irq_domain_map,
@@ -544,20 +598,21 @@ static void __init combiner_init(void __iomem *combiner_base,
struct device_node *np)
{
int i, irq, irq_base;
- unsigned int max_nr, nr_irq;
+ unsigned int nr_irq;
if (np) {
- if (of_property_read_u32(np, "samsung,combiner-nr", &max_nr)) {
+ if (of_property_read_u32(np, "samsung,combiner-nr",
+ &rt_max_combiner_nr)) {
pr_warning("%s: number of combiners not specified, "
"setting default as %d.\n",
__func__, EXYNOS4_MAX_COMBINER_NR);
- max_nr = EXYNOS4_MAX_COMBINER_NR;
+ rt_max_combiner_nr = EXYNOS4_MAX_COMBINER_NR;
}
} else {
- max_nr = soc_is_exynos5250() ? EXYNOS5_MAX_COMBINER_NR :
- EXYNOS4_MAX_COMBINER_NR;
+ rt_max_combiner_nr = soc_is_exynos5250() ?
+ EXYNOS5_MAX_COMBINER_NR : EXYNOS4_MAX_COMBINER_NR;
}
- nr_irq = max_nr * MAX_IRQ_IN_COMBINER;
+ nr_irq = rt_max_combiner_nr * MAX_IRQ_IN_COMBINER;
irq_base = irq_alloc_descs(COMBINER_IRQ(0, 0), 1, nr_irq, 0);
if (IS_ERR_VALUE(irq_base)) {
@@ -572,7 +627,7 @@ static void __init combiner_init(void __iomem *combiner_base,
return;
}
- for (i = 0; i < max_nr; i++) {
+ for (i = 0; i < rt_max_combiner_nr; i++) {
combiner_init_one(i, combiner_base + (i >> 2) * 0x10);
irq = IRQ_SPI(i);
#ifdef CONFIG_OF
@@ -581,6 +636,11 @@ static void __init combiner_init(void __iomem *combiner_base,
#endif
combiner_cascade_irq(i, irq);
}
+
+#ifdef CONFIG_PM
+ /* Setup suspend/resume combiner saving */
+ cpu_pm_register_notifier(&combiner_notifier_block);
+#endif
}
#ifdef CONFIG_OF
--
1.7.7.3
--
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