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of/irq: Add new function of_msi_map_rid()

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The device tree property "msi-map" specifies how to create the PCI
requester id used in some MSI controllers.  Add a new function
of_msi_map_rid() that finds the msi-map property and applies its
translation to a given requester id.

Reviewed-by: Marc Zyngier <marc.zyngier@arm.com>
Acked-by: Rob Herring <robh@kernel.org>
Signed-off-by: David Daney <david.daney@cavium.com>
Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
This commit is contained in:
David Daney 2015-10-08 15:10:48 -07:00 • committed by Marc Zyngier
parent b531566e4d
commit 8db02d8b40
2 changed files with 91 additions and 0 deletions
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7
include/linux/of_irq.h
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@ -75,6 +75,7 @@ static inline int of_irq_to_resource_table(struct device_node *dev,
extern unsigned int irq_of_parse_and_map(struct device_node *node, int index);
extern struct device_node *of_irq_find_parent(struct device_node *child);
extern void of_msi_configure(struct device *dev, struct device_node *np);
u32 of_msi_map_rid(struct device *dev, struct device_node *msi_np, u32 rid_in);
#else /* !CONFIG_OF */
static inline unsigned int irq_of_parse_and_map(struct device_node *dev,
@ -87,6 +88,12 @@ static inline void *of_irq_find_parent(struct device_node *child)
{
return NULL;
}
static inline u32 of_msi_map_rid(struct device *dev,
struct device_node *msi_np, u32 rid_in)
{
return rid_in;
}
#endif /* !CONFIG_OF */
#endif /* __OF_IRQ_H */