GIC: Add API to set interrupt routing
SPIs can be routed to either a specific PE, or to any one of all
available PEs.
API documentation updated.
Change-Id: I28675f634568aaf4ea1aa8aa7ebf25b419a963ed
Co-authored-by: Yousuf A <yousuf.sait@arm.com>
Signed-off-by: Jeenu Viswambharan <jeenu.viswambharan@arm.com>
diff --git a/drivers/arm/gic/v2/gicv2_main.c b/drivers/arm/gic/v2/gicv2_main.c
index b59e458..f0b902c 100644
--- a/drivers/arm/gic/v2/gicv2_main.c
+++ b/drivers/arm/gic/v2/gicv2_main.c
@@ -403,3 +403,38 @@
dsbishst();
gicd_write_sgir(driver_data->gicd_base, sgir_val);
}
+
+/*******************************************************************************
+ * This function sets the interrupt routing for the given SPI interrupt id.
+ * The interrupt routing is specified in routing mode. The proc_num parameter is
+ * linear index of the PE to target SPI. When proc_num < 0, the SPI may target
+ * all PEs.
+ ******************************************************************************/
+void gicv2_set_spi_routing(unsigned int id, int proc_num)
+{
+ int target;
+
+ assert(driver_data);
+ assert(driver_data->gicd_base);
+
+ assert(id >= MIN_SPI_ID && id <= MAX_SPI_ID);
+
+ /*
+ * Target masks array must have been supplied, and the core position
+ * should be valid.
+ */
+ assert(driver_data->target_masks);
+ assert(proc_num < GICV2_MAX_TARGET_PE);
+ assert(proc_num < driver_data->target_masks_num);
+
+ if (proc_num < 0) {
+ /* Target all PEs */
+ target = GIC_TARGET_CPU_MASK;
+ } else {
+ /* Don't route interrupt if the mask hasn't been populated */
+ target = driver_data->target_masks[proc_num];
+ assert(target != 0);
+ }
+
+ gicd_set_itargetsr(driver_data->gicd_base, id, target);
+}