diff options
| -rw-r--r-- | drivers/of/irq.c | 59 | ||||
| -rw-r--r-- | include/linux/of_irq.h | 9 |
2 files changed, 68 insertions, 0 deletions
diff --git a/drivers/of/irq.c b/drivers/of/irq.c index c90bd4ec3183..62cfdc2c86ac 100644 --- a/drivers/of/irq.c +++ b/drivers/of/irq.c @@ -682,3 +682,62 @@ u32 of_msi_map_rid(struct device *dev, struct device_node *msi_np, u32 rid_in) return rid_out; } + +static struct irq_domain *__of_get_msi_domain(struct device_node *np, + enum irq_domain_bus_token token) +{ + struct irq_domain *d; + + d = irq_find_matching_host(np, token); + if (!d) + d = irq_find_host(np); + + return d; +} + +/** + * of_msi_get_domain - Use msi-parent to find the relevant MSI domain + * @dev: device for which the domain is requested + * @np: device node for @dev + * @token: bus type for this domain + * + * Parse the msi-parent property (both the simple and the complex + * versions), and returns the corresponding MSI domain. + * + * Returns: the MSI domain for this device (or NULL on failure). + */ +struct irq_domain *of_msi_get_domain(struct device *dev, + struct device_node *np, + enum irq_domain_bus_token token) +{ + struct device_node *msi_np; + struct irq_domain *d; + + /* Check for a single msi-parent property */ + msi_np = of_parse_phandle(np, "msi-parent", 0); + if (msi_np && !of_property_read_bool(msi_np, "#msi-cells")) { + d = __of_get_msi_domain(msi_np, token); + if (!d) + of_node_put(msi_np); + return d; + } + + if (token == DOMAIN_BUS_PLATFORM_MSI) { + /* Check for the complex msi-parent version */ + struct of_phandle_args args; + int index = 0; + + while (!of_parse_phandle_with_args(np, "msi-parent", + "#msi-cells", + index, &args)) { + d = __of_get_msi_domain(args.np, token); + if (d) + return d; + + of_node_put(args.np); + index++; + } + } + + return NULL; +} diff --git a/include/linux/of_irq.h b/include/linux/of_irq.h index 8cd9334e5731..62ae6edecfd5 100644 --- a/include/linux/of_irq.h +++ b/include/linux/of_irq.h @@ -46,6 +46,9 @@ extern int of_irq_get(struct device_node *dev, int index); extern int of_irq_get_byname(struct device_node *dev, const char *name); extern int of_irq_to_resource_table(struct device_node *dev, struct resource *res, int nr_irqs); +extern struct irq_domain *of_msi_get_domain(struct device *dev, + struct device_node *np, + enum irq_domain_bus_token token); #else static inline int of_irq_count(struct device_node *dev) { @@ -64,6 +67,12 @@ static inline int of_irq_to_resource_table(struct device_node *dev, { return 0; } +static inline struct irq_domain *of_msi_get_domain(struct device *dev, + struct device_node *np, + enum irq_domain_bus_token token) +{ + return NULL; +} #endif #if defined(CONFIG_OF) |