c71a54b082
of_irq_init will scan the devicetree for matching interrupt controller nodes. Then it calls an initialization function for each found controller in the proper order with parent nodes initialized before child nodes. Based on initial pseudo code from Grant Likely. Changes in v4: - Drop unnecessary empty list check - Be more verbose on errors - Simplify "if (!desc) WARN_ON(1)" to "if (WARN_ON(!desc))" Changes in v3: - add missing kfree's found by Jamie - Implement Grant's comments to simplify the init loop - fix function comments Changes in v2: - Complete re-write of list searching code from Grant Likely Signed-off-by: Rob Herring <rob.herring@calxeda.com> Reviewed-by: Jamie Iles <jamie@jamieiles.com> Tested-by: Thomas Abraham <thomas.abraham@linaro.org> Acked-by: Grant Likely <grant.likely@secretlab.ca>
83 lines
2.7 KiB
C
83 lines
2.7 KiB
C
#ifndef __OF_IRQ_H
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#define __OF_IRQ_H
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#if defined(CONFIG_OF)
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struct of_irq;
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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/ioport.h>
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#include <linux/of.h>
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/*
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* irq_of_parse_and_map() is used ba 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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#if defined(CONFIG_OF_IRQ)
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/**
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* of_irq - container for device_node/irq_specifier pair for an irq controller
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* @controller: pointer to interrupt controller device tree node
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* @size: size of interrupt specifier
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* @specifier: array of cells @size long specifing the specific interrupt
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*
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* This structure is returned when an interrupt is mapped. The controller
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* field needs to be put() after use
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*/
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#define OF_MAX_IRQ_SPEC 4 /* We handle specifiers of at most 4 cells */
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struct of_irq {
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struct device_node *controller; /* Interrupt controller node */
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u32 size; /* Specifier size */
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u32 specifier[OF_MAX_IRQ_SPEC]; /* Specifier copy */
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};
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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_map_oldworld(struct device_node *device, int index,
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struct of_irq *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_map_oldworld(struct device_node *device, int index,
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struct of_irq *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_map_raw(struct device_node *parent, const u32 *intspec,
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u32 ointsize, const u32 *addr,
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struct of_irq *out_irq);
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extern int of_irq_map_one(struct device_node *device, int index,
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struct of_irq *out_irq);
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extern unsigned int irq_create_of_mapping(struct device_node *controller,
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const u32 *intspec,
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unsigned int intsize);
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#ifdef CONFIG_IRQ_DOMAIN
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extern void irq_dispose_mapping(unsigned int irq);
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#endif
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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 int of_irq_count(struct device_node *dev);
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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 device_node *of_irq_find_parent(struct device_node *child);
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extern void of_irq_init(const struct of_device_id *matches);
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#endif /* CONFIG_OF_IRQ */
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#endif /* CONFIG_OF */
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#endif /* __OF_IRQ_H */
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