Introduce the helper function ks_pcie_free_msi_irq() which will undo the
configuration performed by the ks_pcie_config_msi_irq() function. This will
be required for implementing a future helper function to undo the
configuration performed by the ks_pcie_host_init() function.
Signed-off-by: Siddharth Vadapalli <s-vadapalli@xxxxxx>
---
drivers/pci/controller/dwc/pci-keystone.c | 25 +++++++++++++++++++++++
1 file changed, 25 insertions(+)
diff --git a/drivers/pci/controller/dwc/pci-keystone.c b/drivers/pci/controller/dwc/pci-keystone.c
index 3d10e1112131..6cedb6dc4650 100644
--- a/drivers/pci/controller/dwc/pci-keystone.c
+++ b/drivers/pci/controller/dwc/pci-keystone.c
@@ -666,6 +666,31 @@ static void ks_pcie_intx_irq_handler(struct irq_desc *desc)
chained_irq_exit(chip, desc);
}
+static void ks_pcie_free_msi_irq(struct keystone_pcie *ks_pcie)
+{
+ struct device_node *np = ks_pcie->np;
+ struct device_node *intc_np;
+ int irq_count, irq, i;
+
+ if (!IS_ENABLED(CONFIG_PCI_MSI))
+ return;
+
+ /* Nothing to do if MSI Interrupt Controller does not exist */
+ intc_np = of_get_child_by_name(np, "msi-interrupt-controller");
+ if (!intc_np)
+ return;
+
+ /* irq_count should be non-zero. Else, ks_pcie_host_init would have failed. */
+ irq_count = of_irq_count(intc_np);
+
+ for (i = 0; i < irq_count; i++) {
+ /* We expect to get an irq since it succeeded during 'config'. */
+ irq = irq_of_parse_and_map(intc_np, i);
+ irq_set_chained_handler(irq, NULL);
+ }
+ of_node_put(intc_np);
+}
+
static int ks_pcie_config_msi_irq(struct keystone_pcie *ks_pcie)
{
struct device *dev = ks_pcie->pci->dev;
--
2.43.0
