diff options
Diffstat (limited to 'drivers/of/irq.c')
| -rw-r--r-- | drivers/of/irq.c | 22 |
1 files changed, 17 insertions, 5 deletions
diff --git a/drivers/of/irq.c b/drivers/of/irq.c index f8ad79b9b1c9..74aaea61de13 100644 --- a/drivers/of/irq.c +++ b/drivers/of/irq.c @@ -670,8 +670,20 @@ err: } } -static u32 __of_msi_map_id(struct device *dev, struct device_node **np, - u32 id_in) +/** + * of_msi_xlate - map a MSI ID and find relevant MSI controller node + * @dev: device for which the mapping is to be done. + * @msi_np: Pointer to store the MSI controller node + * @id_in: Device ID. + * + * Walk up the device hierarchy looking for devices with a "msi-map" + * property. If found, apply the mapping to @id_in. @msi_np pointed + * value must be NULL on entry, if an MSI controller is found @msi_np is + * initialized to the MSI controller node with a reference held. + * + * Returns: The mapped MSI id. + */ +u32 of_msi_xlate(struct device *dev, struct device_node **msi_np, u32 id_in) { struct device *parent_dev; u32 id_out = id_in; @@ -682,7 +694,7 @@ static u32 __of_msi_map_id(struct device *dev, struct device_node **np, */ for (parent_dev = dev; parent_dev; parent_dev = parent_dev->parent) if (!of_map_id(parent_dev->of_node, id_in, "msi-map", - "msi-map-mask", np, &id_out)) + "msi-map-mask", msi_np, &id_out)) break; return id_out; } @@ -700,7 +712,7 @@ static u32 __of_msi_map_id(struct device *dev, struct device_node **np, */ u32 of_msi_map_id(struct device *dev, struct device_node *msi_np, u32 id_in) { - return __of_msi_map_id(dev, &msi_np, id_in); + return of_msi_xlate(dev, &msi_np, id_in); } /** @@ -719,7 +731,7 @@ struct irq_domain *of_msi_map_get_device_domain(struct device *dev, u32 id, { struct device_node *np = NULL; - __of_msi_map_id(dev, &np, id); + of_msi_xlate(dev, &np, id); return irq_find_matching_host(np, bus_token); } |