GIC: Add helpers to set interrupt configuration

The helpers perform read-modify-write on GIC*_ICFGR registers, but don't
serialise callers. Any serialisation must be taken care of by the
callers.

Change-Id: I71995f82ff2c7f70d37af0ede30d6ee18682fd3f
Signed-off-by: Jeenu Viswambharan <jeenu.viswambharan@arm.com>

drivers/arm/gic/common/gic_common.c

@@ -299,3 +299,15 @@ void gicd_set_ipriorityr(uintptr_t base, unsigned int id, unsigned int pri)
 {
 	mmio_write_8(base + GICD_IPRIORITYR + id, pri & GIC_PRI_MASK);
 }
+
+void gicd_set_icfgr(uintptr_t base, unsigned int id, unsigned int cfg)
+{
+	unsigned bit_num = id & ((1 << ICFGR_SHIFT) - 1);
+	uint32_t reg_val = gicd_read_icfgr(base, id);
+
+	/* Clear the field, and insert required configuration */
+	reg_val &= ~(GIC_CFG_MASK << bit_num);
+	reg_val |= ((cfg & GIC_CFG_MASK) << bit_num);
+
+	gicd_write_icfgr(base, id, reg_val);
+}

drivers/arm/gic/common/gic_common_private.h

@@ -77,5 +77,6 @@ unsigned int gicd_get_isactiver(uintptr_t base, unsigned int id);
 void gicd_set_isactiver(uintptr_t base, unsigned int id);
 void gicd_set_icactiver(uintptr_t base, unsigned int id);
 void gicd_set_ipriorityr(uintptr_t base, unsigned int id, unsigned int pri);
+void gicd_set_icfgr(uintptr_t base, unsigned int id, unsigned int cfg);
 
 #endif /* GIC_COMMON_PRIVATE_H_ */

drivers/arm/gic/v3/gicv3_helpers.c

@@ -225,6 +225,38 @@ void gicr_set_ipriorityr(uintptr_t base, unsigned int id, unsigned int pri)
 	mmio_write_8(base + GICR_IPRIORITYR + id, pri & GIC_PRI_MASK);
 }
 
+/*
+ * Accessor to set the bit fields corresponding to interrupt ID
+ * in GIC Re-distributor ICFGR0.
+ */
+void gicr_set_icfgr0(uintptr_t base, unsigned int id, unsigned int cfg)
+{
+	unsigned bit_num = id & ((1 << ICFGR_SHIFT) - 1);
+	uint32_t reg_val = gicr_read_icfgr0(base);
+
+	/* Clear the field, and insert required configuration */
+	reg_val &= ~(GIC_CFG_MASK << bit_num);
+	reg_val |= ((cfg & GIC_CFG_MASK) << bit_num);
+
+	gicr_write_icfgr0(base, reg_val);
+}
+
+/*
+ * Accessor to set the bit fields corresponding to interrupt ID
+ * in GIC Re-distributor ICFGR1.
+ */
+void gicr_set_icfgr1(uintptr_t base, unsigned int id, unsigned int cfg)
+{
+	unsigned bit_num = id & ((1 << ICFGR_SHIFT) - 1);
+	uint32_t reg_val = gicr_read_icfgr1(base);
+
+	/* Clear the field, and insert required configuration */
+	reg_val &= ~(GIC_CFG_MASK << bit_num);
+	reg_val |= ((cfg & GIC_CFG_MASK) << bit_num);
+
+	gicr_write_icfgr1(base, reg_val);
+}
+
 /******************************************************************************
  * This function marks the core as awake in the re-distributor and
  * ensures that the interface is active.

include/drivers/arm/gic_common.h

@@ -23,6 +23,9 @@
 /* Mask for the priority field common to all GIC interfaces */
 #define GIC_PRI_MASK			0xff
 
+/* Mask for the configuration field common to all GIC interfaces */
+#define GIC_CFG_MASK			0x3
+
 /* Constant to indicate a spurious interrupt in all GIC versions */
 #define GIC_SPURIOUS_INTERRUPT		1023