[PATCH v3 06/26] irqchip/apple-aic: Add FW info retrieval support

[Marc Zyngier <maz@kernel.org>]

Plug the new .get_fwspec_info() callback into the Apple AIC driver,
using some of the existing FIQ affinity handling infrastructure.

Acked-by: Sven Peter <sven@kernel.org>
Signed-off-by: Marc Zyngier <maz@kernel.org>
---
 drivers/irqchip/irq-apple-aic.c | 28 ++++++++++++++++++++++++++++
 1 file changed, 28 insertions(+)

diff --git a/drivers/irqchip/irq-apple-aic.c b/drivers/irqchip/irq-apple-aic.c
index 032d66dceb8ec..cb8b6f40ce8d3 100644
--- a/drivers/irqchip/irq-apple-aic.c
+++ b/drivers/irqchip/irq-apple-aic.c
@@ -651,6 +651,33 @@ static int aic_irq_domain_map(struct irq_domain *id, unsigned int irq,
 	return 0;
 }
 
+static int aic_irq_get_fwspec_info(struct irq_fwspec *fwspec, struct irq_fwspec_info *info)
+{
+	const struct cpumask *mask;
+	u32 intid;
+
+	info->flags = 0;
+	info->affinity = NULL;
+
+	if (fwspec->param[0] != AIC_FIQ)
+		return 0;
+
+	if (fwspec->param_count == 3)
+		intid = fwspec->param[1];
+	else
+		intid = fwspec->param[2];
+
+	if (aic_irqc->fiq_aff[intid])
+		mask = &aic_irqc->fiq_aff[intid]->aff;
+	else
+		mask = cpu_possible_mask;
+
+	info->affinity = mask;
+	info->flags = IRQ_FWSPEC_INFO_AFFINITY_VALID;
+
+	return 0;
+}
+
 static int aic_irq_domain_translate(struct irq_domain *id,
 				    struct irq_fwspec *fwspec,
 				    unsigned long *hwirq,
@@ -753,6 +780,7 @@ static const struct irq_domain_ops aic_irq_domain_ops = {
 	.translate	= aic_irq_domain_translate,
 	.alloc		= aic_irq_domain_alloc,
 	.free		= aic_irq_domain_free,
+	.get_fwspec_info = aic_irq_get_fwspec_info,
 };
 
 /*
-- 
2.47.3