48ae34fb39
Since 126b16e2ad ("Docs: dt: add generic MSI bindings"),
the definition of "msi-parent" has evolved, while maintaining
some degree of compatibility. It can now express multiple MSI
controllers as parents, as well as some sideband data being
communicated to the controller.
This patch adds the parsing of the property, iterating over
the multiple parents until a suitable irqdomain is found.
It can also fallback to the original parsing if the old
binding is detected.
This support code gets used in the subsequent patches.
Suggested-by: Robin Murphy <robin.murphy@arm.com>
Acked-by: Rob Herring <robh@kernel.org>
Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
108 lines
3.2 KiB
C
108 lines
3.2 KiB
C
#ifndef __OF_IRQ_H
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#define __OF_IRQ_H
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#include <linux/types.h>
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#include <linux/errno.h>
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#include <linux/irq.h>
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#include <linux/irqdomain.h>
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#include <linux/ioport.h>
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#include <linux/of.h>
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typedef int (*of_irq_init_cb_t)(struct device_node *, struct device_node *);
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/*
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* Workarounds only applied to 32bit powermac machines
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*/
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#define OF_IMAP_OLDWORLD_MAC 0x00000001
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#define OF_IMAP_NO_PHANDLE 0x00000002
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#if defined(CONFIG_PPC32) && defined(CONFIG_PPC_PMAC)
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extern unsigned int of_irq_workarounds;
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extern struct device_node *of_irq_dflt_pic;
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extern int of_irq_parse_oldworld(struct device_node *device, int index,
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struct of_phandle_args *out_irq);
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#else /* CONFIG_PPC32 && CONFIG_PPC_PMAC */
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#define of_irq_workarounds (0)
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#define of_irq_dflt_pic (NULL)
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static inline int of_irq_parse_oldworld(struct device_node *device, int index,
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struct of_phandle_args *out_irq)
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{
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return -EINVAL;
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}
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#endif /* CONFIG_PPC32 && CONFIG_PPC_PMAC */
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extern int of_irq_parse_raw(const __be32 *addr, struct of_phandle_args *out_irq);
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extern int of_irq_parse_one(struct device_node *device, int index,
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struct of_phandle_args *out_irq);
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extern unsigned int irq_create_of_mapping(struct of_phandle_args *irq_data);
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extern int of_irq_to_resource(struct device_node *dev, int index,
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struct resource *r);
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extern void of_irq_init(const struct of_device_id *matches);
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#ifdef CONFIG_OF_IRQ
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extern int of_irq_count(struct device_node *dev);
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extern int of_irq_get(struct device_node *dev, int index);
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extern int of_irq_get_byname(struct device_node *dev, const char *name);
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extern int of_irq_to_resource_table(struct device_node *dev,
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struct resource *res, int nr_irqs);
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extern struct irq_domain *of_msi_get_domain(struct device *dev,
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struct device_node *np,
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enum irq_domain_bus_token token);
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#else
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static inline int of_irq_count(struct device_node *dev)
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{
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return 0;
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}
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static inline int of_irq_get(struct device_node *dev, int index)
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{
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return 0;
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}
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static inline int of_irq_get_byname(struct device_node *dev, const char *name)
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{
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return 0;
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}
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static inline int of_irq_to_resource_table(struct device_node *dev,
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struct resource *res, int nr_irqs)
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{
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return 0;
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}
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static inline struct irq_domain *of_msi_get_domain(struct device *dev,
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struct device_node *np,
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enum irq_domain_bus_token token)
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{
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return NULL;
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}
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#endif
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#if defined(CONFIG_OF)
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/*
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* irq_of_parse_and_map() is used by all OF enabled platforms; but SPARC
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* implements it differently. However, the prototype is the same for all,
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* so declare it here regardless of the CONFIG_OF_IRQ setting.
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*/
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extern unsigned int irq_of_parse_and_map(struct device_node *node, int index);
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extern struct device_node *of_irq_find_parent(struct device_node *child);
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extern void of_msi_configure(struct device *dev, struct device_node *np);
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u32 of_msi_map_rid(struct device *dev, struct device_node *msi_np, u32 rid_in);
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#else /* !CONFIG_OF */
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static inline unsigned int irq_of_parse_and_map(struct device_node *dev,
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int index)
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{
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return 0;
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}
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static inline void *of_irq_find_parent(struct device_node *child)
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{
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return NULL;
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}
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static inline u32 of_msi_map_rid(struct device *dev,
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struct device_node *msi_np, u32 rid_in)
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{
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return rid_in;
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}
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#endif /* !CONFIG_OF */
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#endif /* __OF_IRQ_H */
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