Reserve legacy LPC irqs (0~15) to avoid spurious interrupts.
Cc: stable@xxxxxxxxxxxxxxx
Signed-off-by: Huacai Chen <chenhc@xxxxxxxxxx>
---
drivers/irqchip/irq-loongson-pch-pic.c | 19 ++++++++++++++++++-
1 file changed, 18 insertions(+), 1 deletion(-)
diff --git a/drivers/irqchip/irq-loongson-pch-pic.c b/drivers/irqchip/irq-loongson-pch-pic.c
index 9bf6b9a..9f6719c 100644
--- a/drivers/irqchip/irq-loongson-pch-pic.c
+++ b/drivers/irqchip/irq-loongson-pch-pic.c
@@ -35,6 +35,7 @@
struct pch_pic {
void __iomem *base;
+ struct irq_domain *lpc_domain;
struct irq_domain *pic_domain;
u32 ht_vec_base;
raw_spinlock_t pic_lock;
@@ -184,9 +185,9 @@ static void pch_pic_reset(struct pch_pic *priv)
static int pch_pic_of_init(struct device_node *node,
struct device_node *parent)
{
+ int i, base, err;
struct pch_pic *priv;
struct irq_domain *parent_domain;
- int err;
priv = kzalloc(sizeof(*priv), GFP_KERNEL);
if (!priv)
@@ -213,6 +214,22 @@ static int pch_pic_of_init(struct device_node *node,
goto iounmap_base;
}
+ base = irq_alloc_descs(-1, 0, NR_IRQS_LEGACY, 0);
+ if (base < 0) {
+ pr_err("Failed to allocate LPC IRQ numbers\n");
+ goto iounmap_base;
+ }
+
+ priv->lpc_domain = irq_domain_add_legacy(node, NR_IRQS_LEGACY, 0, 0,
+ &irq_domain_simple_ops, NULL);
+ if (!priv->lpc_domain) {
+ pr_err("Failed to add irqdomain for LPC controller");
+ goto iounmap_base;
+ }
+
+ for (i = 0; i < NR_IRQS_LEGACY; i++)
+ irq_set_chip_and_handler(i, &dummy_irq_chip, handle_simple_irq);
+
priv->pic_domain = irq_domain_create_hierarchy(parent_domain, 0,
PIC_COUNT,
of_node_to_fwnode(node),
--
2.7.0
