arm: gic-v3-its: Implement of_xlate

Translate IRQs by implementing of_xlate() as required by
irq_get_by_index() to parse interrupt properties.

Map DT interrupts to ARM GIC interrupts as follows:

- Interrupt numbers ID32-ID1019 are used for SPIs
- ID0-ID15 are used for SGIs
- ID16-ID31 are used for PPIs

TEST: Booted on qemu sbsa-ref that has a GICV3.

Signed-off-by: Patrick Rudolph <patrick.rudolph@9elements.com>
Reviewed-by: Moritz Fischer <moritzf@google.com>

diff --git a/arch/arm/lib/gic-v3-its.c b/arch/arm/lib/gic-v3-its.c
index 22fa46a34176422e2b34918b263f2b7491f742a2..58f8bf864f13ef79c60488a08762b4f8f3cbdc4c 100644 (file)
--- a/arch/arm/lib/gic-v3-its.c
+++ b/arch/arm/lib/gic-v3-its.c
@@ -4,9 +4,11 @@
  */
 #include <cpu_func.h>
 #include <dm.h>
+#include <irq.h>
 #include <asm/gic.h>
 #include <asm/gic-v3.h>
 #include <asm/io.h>
+#include <dt-bindings/interrupt-controller/arm-gic.h>
 #include <linux/bitops.h>
 #include <linux/printk.h>
 #include <linux/sizes.h>
@@ -163,8 +165,30 @@ static const struct udevice_id gic_v3_ids[] = {
        {}
 };
 
+static int arm_gic_v3_of_xlate(struct irq *irq, struct ofnode_phandle_args *args)
+{
+       if (args->args_count < 3) {
+               log_debug("Invalid args_count: %d\n", args->args_count);
+               return -EINVAL;
+       }
+
+       if (args->args[0] == GIC_SPI)
+               irq->id = args->args[1] + 32;
+       else
+               irq->id = args->args[1] + 16;
+
+       irq->flags = args->args[2];
+
+       return 0;
+}
+
+static const struct irq_ops arm_gic_v3_ops = {
+       .of_xlate               =  arm_gic_v3_of_xlate,
+};
+
 U_BOOT_DRIVER(arm_gic_v3) = {
        .name           = "gic-v3",
        .id             = UCLASS_IRQ,
        .of_match       = gic_v3_ids,
+       .ops            = &arm_gic_v3_ops,
 };