drivers: gic: Add irq pending check and clear function

Implement irq pending check and clear function for both gic and gicv3.

Signed-off-by: Jaxson Han <[email protected]>

Author: povergoing

drivers/interrupt_controller/intc_gic.c

@@ -57,6 +57,29 @@ bool arm_gic_irq_is_enabled(unsigned int irq)
 	return (enabler & (1 << int_off)) != 0;
 }
 
+bool arm_gic_irq_is_pending(unsigned int irq)
+{
+	int int_grp, int_off;
+	unsigned int enabler;
+
+	int_grp = irq / 32;
+	int_off = irq % 32;
+
+	enabler = sys_read32(GICD_ISPENDRn + int_grp * 4);
+
+	return (enabler & (1 << int_off)) != 0;
+}
+
+void arm_gic_irq_clear_pending(unsigned int irq)
+{
+	int int_grp, int_off;
+
+	int_grp = irq / 32;
+	int_off = irq % 32;
+
+	sys_write32((1 << int_off), (GICD_ICPENDRn + int_grp * 4));
+}
+
 void arm_gic_irq_set_priority(
 	unsigned int irq, unsigned int prio, uint32_t flags)
 {

drivers/interrupt_controller/intc_gicv3.c

@@ -213,6 +213,25 @@ bool arm_gic_irq_is_enabled(unsigned int intid)
 	return (val & mask) != 0;
 }
 
+bool arm_gic_irq_is_pending(unsigned int intid)
+{
+	uint32_t mask = BIT(intid & (GIC_NUM_INTR_PER_REG - 1));
+	uint32_t idx = intid / GIC_NUM_INTR_PER_REG;
+	uint32_t val;
+
+	val = sys_read32(ISPENDR(GET_DIST_BASE(intid), idx));
+
+	return (val & mask) != 0;
+}
+
+void arm_gic_irq_clear_pending(unsigned int intid)
+{
+	uint32_t mask = BIT(intid & (GIC_NUM_INTR_PER_REG - 1));
+	uint32_t idx = intid / GIC_NUM_INTR_PER_REG;
+
+	sys_write32(mask, ICPENDR(GET_DIST_BASE(intid), idx));
+}
+
 unsigned int arm_gic_get_active(void)
 {
 	int intid;

include/zephyr/drivers/interrupt_controller/gic.h

@@ -294,6 +294,21 @@ void arm_gic_irq_disable(unsigned int irq);
  */
 bool arm_gic_irq_is_enabled(unsigned int irq);
 
+/**
+ * @brief Check if an interrupt is pending
+ *
+ * @param irq interrupt ID
+ * @return Returns true if interrupt is pending, false otherwise
+ */
+bool arm_gic_irq_is_pending(unsigned int irq);
+
+/**
+ * @brief Clear the pending irq
+ *
+ * @param irq interrupt ID
+ */
+void arm_gic_irq_clear_pending(unsigned int irq);
+
 /**
  * @brief Set interrupt priority
  *