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irq_domain: Make irq_domain structure match powerpc's irq_host
Part of the series to unify the irq remapping mechanisms in the kernel. A follow up patch will copy the powerpc implementation into kernel/irq/irqdomain.c, which will be a lot easier if the structures are identical. Where they differ, I've chose to use the powerpc names since there is a lot more code using those names. Signed-off-by: Grant Likely <grant.likely@secretlab.ca> Cc: Rob Herring <rob.herring@calxeda.com> Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: Milton Miller <miltonm@bga.com> Tested-by: Olof Johansson <olof@lixom.net>
This commit is contained in:
Grant Likely
parent
e1964c50a8
commit
7bb69bade0
3 changed files with 78 additions and 34 deletions
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@ -619,10 +619,10 @@ static void __init gic_pm_init(struct gic_chip_data *gic)
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#endif
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#ifdef CONFIG_OF
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static int gic_irq_domain_dt_translate(struct irq_domain *d,
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struct device_node *controller,
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const u32 *intspec, unsigned int intsize,
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unsigned long *out_hwirq, unsigned int *out_type)
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static int gic_irq_domain_xlate(struct irq_domain *d,
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struct device_node *controller,
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const u32 *intspec, unsigned int intsize,
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unsigned long *out_hwirq, unsigned int *out_type)
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{
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if (d->of_node != controller)
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return -EINVAL;
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@ -641,9 +641,9 @@ static int gic_irq_domain_dt_translate(struct irq_domain *d,
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}
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#endif
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const struct irq_domain_ops gic_irq_domain_ops = {
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struct irq_domain_ops gic_irq_domain_ops = {
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#ifdef CONFIG_OF
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.dt_translate = gic_irq_domain_dt_translate,
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.xlate = gic_irq_domain_xlate,
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#endif
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};
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@ -721,7 +721,7 @@ void __init gic_init_bases(unsigned int gic_nr, int irq_start,
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irq_start);
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domain->irq_base = irq_start;
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}
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domain->priv = gic;
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domain->host_data = gic;
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domain->ops = &gic_irq_domain_ops;
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irq_domain_add(domain);
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@ -9,61 +9,105 @@
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* representation into a hardware irq number that can be mapped back to a
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* Linux irq number without any extra platform support code.
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*
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* irq_domain is expected to be embedded in an interrupt controller's private
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* data structure.
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* Interrupt controller "domain" data structure. This could be defined as a
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* irq domain controller. That is, it handles the mapping between hardware
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* and virtual interrupt numbers for a given interrupt domain. The domain
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* structure is generally created by the PIC code for a given PIC instance
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* (though a domain can cover more than one PIC if they have a flat number
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* model). It's the domain callbacks that are responsible for setting the
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* irq_chip on a given irq_desc after it's been mapped.
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*/
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#ifndef _LINUX_IRQDOMAIN_H
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#define _LINUX_IRQDOMAIN_H
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#include <linux/irq.h>
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#include <linux/mod_devicetable.h>
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#include <linux/types.h>
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#include <linux/radix-tree.h>
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#ifdef CONFIG_IRQ_DOMAIN
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struct device_node;
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struct irq_domain;
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struct of_device_id;
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/* This type is the placeholder for a hardware interrupt number. It has to
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* be big enough to enclose whatever representation is used by a given
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* platform.
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*/
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typedef unsigned long irq_hw_number_t;
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/**
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* struct irq_domain_ops - Methods for irq_domain objects
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* @match: Match an interrupt controller device node to a host, returns
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* 1 on a match
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* @map: Create or update a mapping between a virtual irq number and a hw
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* irq number. This is called only once for a given mapping.
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* @unmap: Dispose of such a mapping
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* @to_irq: (optional) given a local hardware irq number, return the linux
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* irq number. If to_irq is not implemented, then the irq_domain
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* will use this translation: irq = (domain->irq_base + hwirq)
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* @dt_translate: Given a device tree node and interrupt specifier, decode
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* the hardware irq number and linux irq type value.
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* @xlate: Given a device tree node and interrupt specifier, decode
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* the hardware irq number and linux irq type value.
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*
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* Functions below are provided by the driver and called whenever a new mapping
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* is created or an old mapping is disposed. The driver can then proceed to
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* whatever internal data structures management is required. It also needs
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* to setup the irq_desc when returning from map().
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*/
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struct irq_domain_ops {
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int (*match)(struct irq_domain *d, struct device_node *node);
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int (*map)(struct irq_domain *d, unsigned int virq, irq_hw_number_t hw);
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void (*unmap)(struct irq_domain *d, unsigned int virq);
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unsigned int (*to_irq)(struct irq_domain *d, unsigned long hwirq);
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#ifdef CONFIG_OF
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int (*dt_translate)(struct irq_domain *d, struct device_node *node,
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const u32 *intspec, unsigned int intsize,
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unsigned long *out_hwirq, unsigned int *out_type);
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#endif /* CONFIG_OF */
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int (*xlate)(struct irq_domain *d, struct device_node *node,
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const u32 *intspec, unsigned int intsize,
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unsigned long *out_hwirq, unsigned int *out_type);
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};
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/**
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* struct irq_domain - Hardware interrupt number translation object
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* @list: Element in global irq_domain list.
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* @link: Element in global irq_domain list.
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* @revmap_type: Method used for reverse mapping hwirq numbers to linux irq. This
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* will be one of the IRQ_DOMAIN_MAP_* values.
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* @revmap_data: Revmap method specific data.
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* @ops: pointer to irq_domain methods
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* @host_data: private data pointer for use by owner. Not touched by irq_domain
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* core code.
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* @irq_base: Start of irq_desc range assigned to the irq_domain. The creator
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* of the irq_domain is responsible for allocating the array of
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* irq_desc structures.
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* @nr_irq: Number of irqs managed by the irq domain
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* @hwirq_base: Starting number for hwirqs managed by the irq domain
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* @ops: pointer to irq_domain methods
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* @priv: private data pointer for use by owner. Not touched by irq_domain
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* core code.
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* @of_node: (optional) Pointer to device tree nodes associated with the
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* irq_domain. Used when decoding device tree interrupt specifiers.
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*/
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struct irq_domain {
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struct list_head list;
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struct list_head link;
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/* type of reverse mapping_technique */
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unsigned int revmap_type;
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#define IRQ_DOMAIN_MAP_LEGACY 0 /* legacy 8259, gets irqs 1..15 */
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#define IRQ_DOMAIN_MAP_NOMAP 1 /* no fast reverse mapping */
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#define IRQ_DOMAIN_MAP_LINEAR 2 /* linear map of interrupts */
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#define IRQ_DOMAIN_MAP_TREE 3 /* radix tree */
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union {
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struct {
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unsigned int size;
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unsigned int *revmap;
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} linear;
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struct radix_tree_root tree;
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} revmap_data;
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struct irq_domain_ops *ops;
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void *host_data;
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irq_hw_number_t inval_irq;
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unsigned int irq_base;
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unsigned int nr_irq;
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unsigned int hwirq_base;
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const struct irq_domain_ops *ops;
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void *priv;
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/* Optional device node pointer */
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struct device_node *of_node;
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};
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#ifdef CONFIG_IRQ_DOMAIN
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/**
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* irq_domain_to_irq() - Translate from a hardware irq to a linux irq number
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*
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@ -43,7 +43,7 @@ void irq_domain_add(struct irq_domain *domain)
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}
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mutex_lock(&irq_domain_mutex);
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list_add(&domain->list, &irq_domain_list);
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list_add(&domain->link, &irq_domain_list);
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mutex_unlock(&irq_domain_mutex);
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}
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@ -57,7 +57,7 @@ void irq_domain_del(struct irq_domain *domain)
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int hwirq, irq;
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mutex_lock(&irq_domain_mutex);
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list_del(&domain->list);
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list_del(&domain->link);
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mutex_unlock(&irq_domain_mutex);
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/* Clear the irq_domain assignments */
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@ -88,10 +88,10 @@ unsigned int irq_create_of_mapping(struct device_node *controller,
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/* Find a domain which can translate the irq spec */
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mutex_lock(&irq_domain_mutex);
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list_for_each_entry(domain, &irq_domain_list, list) {
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if (!domain->ops->dt_translate)
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list_for_each_entry(domain, &irq_domain_list, link) {
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if (!domain->ops->xlate)
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continue;
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rc = domain->ops->dt_translate(domain, controller,
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rc = domain->ops->xlate(domain, controller,
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intspec, intsize, &hwirq, &type);
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if (rc == 0)
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break;
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@ -126,7 +126,7 @@ void irq_dispose_mapping(unsigned int irq)
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}
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EXPORT_SYMBOL_GPL(irq_dispose_mapping);
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int irq_domain_simple_dt_translate(struct irq_domain *d,
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int irq_domain_simple_xlate(struct irq_domain *d,
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struct device_node *controller,
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const u32 *intspec, unsigned int intsize,
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unsigned long *out_hwirq, unsigned int *out_type)
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@ -181,7 +181,7 @@ EXPORT_SYMBOL_GPL(irq_domain_generate_simple);
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struct irq_domain_ops irq_domain_simple_ops = {
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#ifdef CONFIG_OF_IRQ
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.dt_translate = irq_domain_simple_dt_translate,
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.xlate = irq_domain_simple_xlate,
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#endif /* CONFIG_OF_IRQ */
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};
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EXPORT_SYMBOL_GPL(irq_domain_simple_ops);
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