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arm: gic-v3-its: Implement of_xlate

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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>
This commit is contained in:
Patrick Rudolph 2024-10-23 15:20:03 +02:00 committed by Tom Rini
parent 581e0cac2d
commit 11a86874c0
1 changed files with 24 additions and 0 deletions
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24
arch/arm/lib/gic-v3-its.c
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@ -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,
};