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-rw-r--r--drivers/mfd/db8500-prcmu.c33
-rw-r--r--include/linux/mfd/db8500-prcmu.h1
-rw-r--r--include/linux/mfd/dbx500-prcmu.h8
3 files changed, 42 insertions, 0 deletions
diff --git a/drivers/mfd/db8500-prcmu.c b/drivers/mfd/db8500-prcmu.c
index d2244dc..8346a0e 100644
--- a/drivers/mfd/db8500-prcmu.c
+++ b/drivers/mfd/db8500-prcmu.c
@@ -30,6 +30,7 @@
#include <linux/mfd/dbx500-prcmu.h>
#include <linux/regulator/db8500-prcmu.h>
#include <linux/regulator/machine.h>
+#include <asm/hardware/gic.h>
#include <mach/hardware.h>
#include <mach/irqs.h>
#include <mach/db8500-regs.h>
@@ -850,6 +851,38 @@ int db8500_prcmu_gic_recouple(void)
return 0;
}
+#define PRCMU_GIC_NUMBER_REGS 5
+
+/*
+ * This function checks if there are pending irq on the gic. It only
+ * makes sense if the gic has been decoupled before with the
+ * db8500_prcmu_gic_decouple function. Disabling an interrupt only
+ * disables the forwarding of the interrupt to any CPU interface. It
+ * does not prevent the interrupt from changing state, for example
+ * becoming pending, or active and pending if it is already
+ * active. Hence, we have to check the interrupt is pending *and* is
+ * active.
+ */
+bool db8500_prcmu_gic_pending_irq(void)
+{
+ u32 pr; /* Pending register */
+ u32 er; /* Enable register */
+ void __iomem *dist_base = __io_address(U8500_GIC_DIST_BASE);
+ int i;
+
+ /* 5 registers. STI & PPI not skipped */
+ for (i = 0; i < PRCMU_GIC_NUMBER_REGS; i++) {
+
+ pr = readl_relaxed(dist_base + GIC_DIST_PENDING_SET + i * 4);
+ er = readl_relaxed(dist_base + GIC_DIST_ENABLE_SET + i * 4);
+
+ if (pr & er)
+ return true; /* There is a pending interrupt */
+ }
+
+ return false;
+}
+
/* This function should only be called while mb0_transfer.lock is held. */
static void config_wakeups(void)
{
diff --git a/include/linux/mfd/db8500-prcmu.h b/include/linux/mfd/db8500-prcmu.h
index cf48aa76..92dac13 100644
--- a/include/linux/mfd/db8500-prcmu.h
+++ b/include/linux/mfd/db8500-prcmu.h
@@ -582,6 +582,7 @@ int db8500_prcmu_set_power_state(u8 state, bool keep_ulp_clk, bool keep_ap_pll);
u8 db8500_prcmu_get_power_state_result(void);
int db8500_prcmu_gic_decouple(void);
int db8500_prcmu_gic_recouple(void);
+bool db8500_prcmu_gic_pending_irq(void);
void db8500_prcmu_enable_wakeups(u32 wakeups);
int db8500_prcmu_set_epod(u16 epod_id, u8 epod_state);
int db8500_prcmu_request_clock(u8 clock, bool enable);
diff --git a/include/linux/mfd/dbx500-prcmu.h b/include/linux/mfd/dbx500-prcmu.h
index 5bf5c4f..1641874 100644
--- a/include/linux/mfd/dbx500-prcmu.h
+++ b/include/linux/mfd/dbx500-prcmu.h
@@ -297,6 +297,14 @@ static inline int prcmu_gic_recouple(void)
return db8500_prcmu_gic_recouple();
}
+static inline bool prcmu_gic_pending_irq(void)
+{
+ if (cpu_is_u5500())
+ return -EINVAL;
+ else
+ return db8500_prcmu_gic_pending_irq();
+}
+
static inline int prcmu_set_epod(u16 epod_id, u8 epod_state)
{
if (cpu_is_u5500())
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