1 files changed, 113 insertions, 0 deletions
diff --git a/drivers/mfd/db8500-prcmu.c b/drivers/mfd/db8500-prcmu.c
index f7cad89c1fb..071ba837481 100644
--- a/drivers/mfd/db8500-prcmu.c
+++ b/drivers/mfd/db8500-prcmu.c
@@ -31,6 +31,7 @@
 #include <linux/regulator/db8500-prcmu.h>
 #include <linux/regulator/machine.h>
 #include <linux/mfd/abx500.h>
+#include <asm/hardware/gic.h>
 #include <mach/hardware.h>
 #include <mach/irqs.h>
 #include <mach/db8500-regs.h>
@@ -827,6 +828,118 @@ u8 db8500_prcmu_get_power_state_result(void)
 	return readb(tcdm_base + PRCM_ACK_MB0_AP_PWRSTTR_STATUS);
 }
 
+/* This function decouple the gic from the prcmu */
+int db8500_prcmu_gic_decouple(void)
+{
+	u32 val = readl(PRCM_A9_MASK_REQ);
+
+	/* Set bit 0 register value to 1 */
+	writel(val | PRCM_A9_MASK_REQ_PRCM_A9_MASK_REQ,
+	       PRCM_A9_MASK_REQ);
+
+	/* Make sure the register is updated */
+	readl(PRCM_A9_MASK_REQ);
+
+	/* Wait a few cycles for the gic mask completion */
+	udelay(1);
+
+	return 0;
+}
+
+/* This function recouple the gic with the prcmu */
+int db8500_prcmu_gic_recouple(void)
+{
+	u32 val = readl(PRCM_A9_MASK_REQ);
+
+	/* Set bit 0 register value to 0 */
+	writel(val & ~PRCM_A9_MASK_REQ_PRCM_A9_MASK_REQ, PRCM_A9_MASK_REQ);
+
+	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 checks if there are pending interrupt on the
+ * prcmu which has been delegated to monitor the irqs with the
+ * db8500_prcmu_copy_gic_settings function.
+ */
+bool db8500_prcmu_pending_irq(void)
+{
+        u32 it, im;
+        int i;
+
+        for (i = 0; i < PRCMU_GIC_NUMBER_REGS - 1; i++) {
+                it = readl(PRCM_ARMITVAL31TO0 + i * 4);
+                im = readl(PRCM_ARMITMSK31TO0 + i * 4);
+                if (it & im)
+                        return true; /* There is a pending interrupt */
+        }
+
+        return false;
+}
+
+/*
+ * This function checks if the specified cpu is in in WFI. It's usage
+ * makes sense only if the gic is decoupled with the db8500_prcmu_gic_decouple
+ * function. Of course passing smp_processor_id() to this function will
+ * always return false...
+ */
+bool db8500_prcmu_is_cpu_in_wfi(int cpu)
+{
+	return readl(PRCM_ARM_WFI_STANDBY) & cpu ? PRCM_ARM_WFI_STANDBY_WFI1 :
+		     PRCM_ARM_WFI_STANDBY_WFI0;
+}
+
+/*
+ * This function copies the gic SPI settings to the prcmu in order to
+ * monitor them and abort/finish the retention/off sequence or state.
+ */
+int db8500_prcmu_copy_gic_settings(void)
+{
+        u32 er; /* Enable register */
+	void __iomem *dist_base = __io_address(U8500_GIC_DIST_BASE);
+        int i;
+
+	/* We skip the STI and PPI */
+         for (i = 0; i < PRCMU_GIC_NUMBER_REGS - 1; i++) {
+                 er = readl_relaxed(dist_base + GIC_DIST_ENABLE_SET + (i + 1) * 4);
+                 writel(er, PRCM_ARMITMSK31TO0 + i * 4);
+         }
+
+	return 0;
+}
+
 /* This function should only be called while mb0_transfer.lock is held. */
 static void config_wakeups(void)
 {