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![Linus Walleij](/assets/img/avatar_default.png)
In the simple irqdomain: don't shout warnings to the user, there is no point. An informational print is sufficient. Signed-off-by: Linus Walleij <linus.walleij@linaro.org> Signed-off-by: Grant Likely <grant.likely@secretlab.ca>
925 lines
26 KiB
C
925 lines
26 KiB
C
#define pr_fmt(fmt) "irq: " fmt
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#include <linux/debugfs.h>
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#include <linux/hardirq.h>
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#include <linux/interrupt.h>
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#include <linux/irq.h>
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#include <linux/irqdesc.h>
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#include <linux/irqdomain.h>
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#include <linux/module.h>
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#include <linux/mutex.h>
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#include <linux/of.h>
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#include <linux/of_address.h>
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#include <linux/topology.h>
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#include <linux/seq_file.h>
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#include <linux/slab.h>
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#include <linux/smp.h>
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#include <linux/fs.h>
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#define IRQ_DOMAIN_MAP_LEGACY 0 /* driver allocated fixed range of irqs.
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* ie. 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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static LIST_HEAD(irq_domain_list);
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static DEFINE_MUTEX(irq_domain_mutex);
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static DEFINE_MUTEX(revmap_trees_mutex);
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static struct irq_domain *irq_default_domain;
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/**
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* irq_domain_alloc() - Allocate a new irq_domain data structure
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* @of_node: optional device-tree node of the interrupt controller
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* @revmap_type: type of reverse mapping to use
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* @ops: map/unmap domain callbacks
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* @host_data: Controller private data pointer
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*
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* Allocates and initialize and irq_domain structure. Caller is expected to
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* register allocated irq_domain with irq_domain_register(). Returns pointer
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* to IRQ domain, or NULL on failure.
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*/
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static struct irq_domain *irq_domain_alloc(struct device_node *of_node,
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unsigned int revmap_type,
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const struct irq_domain_ops *ops,
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void *host_data)
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{
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struct irq_domain *domain;
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domain = kzalloc_node(sizeof(*domain), GFP_KERNEL,
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of_node_to_nid(of_node));
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if (WARN_ON(!domain))
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return NULL;
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/* Fill structure */
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domain->revmap_type = revmap_type;
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domain->ops = ops;
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domain->host_data = host_data;
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domain->of_node = of_node_get(of_node);
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return domain;
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}
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static void irq_domain_free(struct irq_domain *domain)
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{
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of_node_put(domain->of_node);
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kfree(domain);
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}
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static 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->link, &irq_domain_list);
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mutex_unlock(&irq_domain_mutex);
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pr_debug("Allocated domain of type %d @0x%p\n",
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domain->revmap_type, domain);
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}
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/**
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* irq_domain_remove() - Remove an irq domain.
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* @domain: domain to remove
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*
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* This routine is used to remove an irq domain. The caller must ensure
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* that all mappings within the domain have been disposed of prior to
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* use, depending on the revmap type.
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*/
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void irq_domain_remove(struct irq_domain *domain)
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{
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mutex_lock(&irq_domain_mutex);
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switch (domain->revmap_type) {
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case IRQ_DOMAIN_MAP_LEGACY:
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/*
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* Legacy domains don't manage their own irq_desc
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* allocations, we expect the caller to handle irq_desc
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* freeing on their own.
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*/
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break;
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case IRQ_DOMAIN_MAP_TREE:
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/*
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* radix_tree_delete() takes care of destroying the root
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* node when all entries are removed. Shout if there are
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* any mappings left.
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*/
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WARN_ON(domain->revmap_data.tree.height);
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break;
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case IRQ_DOMAIN_MAP_LINEAR:
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kfree(domain->revmap_data.linear.revmap);
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domain->revmap_data.linear.size = 0;
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break;
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case IRQ_DOMAIN_MAP_NOMAP:
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break;
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}
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list_del(&domain->link);
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/*
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* If the going away domain is the default one, reset it.
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*/
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if (unlikely(irq_default_domain == domain))
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irq_set_default_host(NULL);
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mutex_unlock(&irq_domain_mutex);
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pr_debug("Removed domain of type %d @0x%p\n",
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domain->revmap_type, domain);
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irq_domain_free(domain);
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}
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EXPORT_SYMBOL_GPL(irq_domain_remove);
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static unsigned int irq_domain_legacy_revmap(struct irq_domain *domain,
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irq_hw_number_t hwirq)
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{
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irq_hw_number_t first_hwirq = domain->revmap_data.legacy.first_hwirq;
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int size = domain->revmap_data.legacy.size;
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if (WARN_ON(hwirq < first_hwirq || hwirq >= first_hwirq + size))
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return 0;
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return hwirq - first_hwirq + domain->revmap_data.legacy.first_irq;
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}
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/**
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* irq_domain_add_simple() - Allocate and register a simple irq_domain.
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* @of_node: pointer to interrupt controller's device tree node.
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* @size: total number of irqs in mapping
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* @first_irq: first number of irq block assigned to the domain
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* @ops: map/unmap domain callbacks
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* @host_data: Controller private data pointer
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*
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* Allocates a legacy irq_domain if irq_base is positive or a linear
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* domain otherwise. For the legacy domain, IRQ descriptors will also
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* be allocated.
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*
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* This is intended to implement the expected behaviour for most
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* interrupt controllers which is that a linear mapping should
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* normally be used unless the system requires a legacy mapping in
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* order to support supplying interrupt numbers during non-DT
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* registration of devices.
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*/
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struct irq_domain *irq_domain_add_simple(struct device_node *of_node,
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unsigned int size,
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unsigned int first_irq,
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const struct irq_domain_ops *ops,
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void *host_data)
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{
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if (first_irq > 0) {
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int irq_base;
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if (IS_ENABLED(CONFIG_SPARSE_IRQ)) {
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/*
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* Set the descriptor allocator to search for a
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* 1-to-1 mapping, such as irq_alloc_desc_at().
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* Use of_node_to_nid() which is defined to
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* numa_node_id() on platforms that have no custom
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* implementation.
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*/
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irq_base = irq_alloc_descs(first_irq, first_irq, size,
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of_node_to_nid(of_node));
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if (irq_base < 0) {
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pr_info("Cannot allocate irq_descs @ IRQ%d, assuming pre-allocated\n",
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first_irq);
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irq_base = first_irq;
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}
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} else
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irq_base = first_irq;
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return irq_domain_add_legacy(of_node, size, irq_base, 0,
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ops, host_data);
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}
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/* A linear domain is the default */
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return irq_domain_add_linear(of_node, size, ops, host_data);
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}
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/**
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* irq_domain_add_legacy() - Allocate and register a legacy revmap irq_domain.
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* @of_node: pointer to interrupt controller's device tree node.
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* @size: total number of irqs in legacy mapping
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* @first_irq: first number of irq block assigned to the domain
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* @first_hwirq: first hwirq number to use for the translation. Should normally
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* be '0', but a positive integer can be used if the effective
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* hwirqs numbering does not begin at zero.
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* @ops: map/unmap domain callbacks
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* @host_data: Controller private data pointer
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*
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* Note: the map() callback will be called before this function returns
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* for all legacy interrupts except 0 (which is always the invalid irq for
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* a legacy controller).
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*/
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struct irq_domain *irq_domain_add_legacy(struct device_node *of_node,
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unsigned int size,
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unsigned int first_irq,
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irq_hw_number_t first_hwirq,
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const struct irq_domain_ops *ops,
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void *host_data)
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{
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struct irq_domain *domain;
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unsigned int i;
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domain = irq_domain_alloc(of_node, IRQ_DOMAIN_MAP_LEGACY, ops, host_data);
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if (!domain)
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return NULL;
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domain->revmap_data.legacy.first_irq = first_irq;
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domain->revmap_data.legacy.first_hwirq = first_hwirq;
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domain->revmap_data.legacy.size = size;
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mutex_lock(&irq_domain_mutex);
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/* Verify that all the irqs are available */
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for (i = 0; i < size; i++) {
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int irq = first_irq + i;
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struct irq_data *irq_data = irq_get_irq_data(irq);
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if (WARN_ON(!irq_data || irq_data->domain)) {
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mutex_unlock(&irq_domain_mutex);
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irq_domain_free(domain);
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return NULL;
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}
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}
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/* Claim all of the irqs before registering a legacy domain */
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for (i = 0; i < size; i++) {
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struct irq_data *irq_data = irq_get_irq_data(first_irq + i);
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irq_data->hwirq = first_hwirq + i;
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irq_data->domain = domain;
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}
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mutex_unlock(&irq_domain_mutex);
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for (i = 0; i < size; i++) {
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int irq = first_irq + i;
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int hwirq = first_hwirq + i;
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/* IRQ0 gets ignored */
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if (!irq)
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continue;
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/* Legacy flags are left to default at this point,
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* one can then use irq_create_mapping() to
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* explicitly change them
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*/
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if (ops->map)
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ops->map(domain, irq, hwirq);
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/* Clear norequest flags */
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irq_clear_status_flags(irq, IRQ_NOREQUEST);
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}
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irq_domain_add(domain);
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return domain;
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}
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EXPORT_SYMBOL_GPL(irq_domain_add_legacy);
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/**
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* irq_domain_add_linear() - Allocate and register a linear revmap irq_domain.
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* @of_node: pointer to interrupt controller's device tree node.
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* @size: Number of interrupts in the domain.
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* @ops: map/unmap domain callbacks
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* @host_data: Controller private data pointer
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*/
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struct irq_domain *irq_domain_add_linear(struct device_node *of_node,
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unsigned int size,
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const struct irq_domain_ops *ops,
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void *host_data)
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{
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struct irq_domain *domain;
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unsigned int *revmap;
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revmap = kzalloc_node(sizeof(*revmap) * size, GFP_KERNEL,
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of_node_to_nid(of_node));
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if (WARN_ON(!revmap))
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return NULL;
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domain = irq_domain_alloc(of_node, IRQ_DOMAIN_MAP_LINEAR, ops, host_data);
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if (!domain) {
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kfree(revmap);
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return NULL;
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}
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domain->revmap_data.linear.size = size;
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domain->revmap_data.linear.revmap = revmap;
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irq_domain_add(domain);
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return domain;
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}
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EXPORT_SYMBOL_GPL(irq_domain_add_linear);
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struct irq_domain *irq_domain_add_nomap(struct device_node *of_node,
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unsigned int max_irq,
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const struct irq_domain_ops *ops,
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void *host_data)
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{
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struct irq_domain *domain = irq_domain_alloc(of_node,
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IRQ_DOMAIN_MAP_NOMAP, ops, host_data);
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if (domain) {
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domain->revmap_data.nomap.max_irq = max_irq ? max_irq : ~0;
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irq_domain_add(domain);
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}
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return domain;
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}
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EXPORT_SYMBOL_GPL(irq_domain_add_nomap);
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/**
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* irq_domain_add_tree()
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* @of_node: pointer to interrupt controller's device tree node.
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* @ops: map/unmap domain callbacks
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*
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* Note: The radix tree will be allocated later during boot automatically
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* (the reverse mapping will use the slow path until that happens).
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*/
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struct irq_domain *irq_domain_add_tree(struct device_node *of_node,
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const struct irq_domain_ops *ops,
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void *host_data)
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{
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struct irq_domain *domain = irq_domain_alloc(of_node,
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IRQ_DOMAIN_MAP_TREE, ops, host_data);
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if (domain) {
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INIT_RADIX_TREE(&domain->revmap_data.tree, GFP_KERNEL);
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irq_domain_add(domain);
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}
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return domain;
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}
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EXPORT_SYMBOL_GPL(irq_domain_add_tree);
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/**
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* irq_find_host() - Locates a domain for a given device node
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* @node: device-tree node of the interrupt controller
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*/
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struct irq_domain *irq_find_host(struct device_node *node)
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{
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struct irq_domain *h, *found = NULL;
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int rc;
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/* We might want to match the legacy controller last since
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* it might potentially be set to match all interrupts in
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* the absence of a device node. This isn't a problem so far
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* yet though...
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*/
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mutex_lock(&irq_domain_mutex);
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list_for_each_entry(h, &irq_domain_list, link) {
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if (h->ops->match)
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rc = h->ops->match(h, node);
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else
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rc = (h->of_node != NULL) && (h->of_node == node);
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if (rc) {
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found = h;
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break;
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}
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}
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mutex_unlock(&irq_domain_mutex);
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return found;
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}
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EXPORT_SYMBOL_GPL(irq_find_host);
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/**
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* irq_set_default_host() - Set a "default" irq domain
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* @domain: default domain pointer
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*
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* For convenience, it's possible to set a "default" domain that will be used
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* whenever NULL is passed to irq_create_mapping(). It makes life easier for
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* platforms that want to manipulate a few hard coded interrupt numbers that
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* aren't properly represented in the device-tree.
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*/
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void irq_set_default_host(struct irq_domain *domain)
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{
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pr_debug("Default domain set to @0x%p\n", domain);
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irq_default_domain = domain;
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}
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EXPORT_SYMBOL_GPL(irq_set_default_host);
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static void irq_domain_disassociate_many(struct irq_domain *domain,
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unsigned int irq_base, int count)
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{
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/*
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* disassociate in reverse order;
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* not strictly necessary, but nice for unwinding
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*/
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while (count--) {
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int irq = irq_base + count;
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struct irq_data *irq_data = irq_get_irq_data(irq);
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irq_hw_number_t hwirq = irq_data->hwirq;
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if (WARN_ON(!irq_data || irq_data->domain != domain))
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continue;
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irq_set_status_flags(irq, IRQ_NOREQUEST);
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/* remove chip and handler */
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irq_set_chip_and_handler(irq, NULL, NULL);
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/* Make sure it's completed */
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synchronize_irq(irq);
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/* Tell the PIC about it */
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if (domain->ops->unmap)
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domain->ops->unmap(domain, irq);
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smp_mb();
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irq_data->domain = NULL;
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irq_data->hwirq = 0;
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/* Clear reverse map */
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switch(domain->revmap_type) {
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case IRQ_DOMAIN_MAP_LINEAR:
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if (hwirq < domain->revmap_data.linear.size)
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domain->revmap_data.linear.revmap[hwirq] = 0;
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break;
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case IRQ_DOMAIN_MAP_TREE:
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mutex_lock(&revmap_trees_mutex);
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radix_tree_delete(&domain->revmap_data.tree, hwirq);
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mutex_unlock(&revmap_trees_mutex);
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break;
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}
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}
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}
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int irq_domain_associate_many(struct irq_domain *domain, unsigned int irq_base,
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irq_hw_number_t hwirq_base, int count)
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{
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unsigned int virq = irq_base;
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irq_hw_number_t hwirq = hwirq_base;
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int i, ret;
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pr_debug("%s(%s, irqbase=%i, hwbase=%i, count=%i)\n", __func__,
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of_node_full_name(domain->of_node), irq_base, (int)hwirq_base, count);
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for (i = 0; i < count; i++) {
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struct irq_data *irq_data = irq_get_irq_data(virq + i);
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if (WARN(!irq_data, "error: irq_desc not allocated; "
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"irq=%i hwirq=0x%x\n", virq + i, (int)hwirq + i))
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return -EINVAL;
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if (WARN(irq_data->domain, "error: irq_desc already associated; "
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"irq=%i hwirq=0x%x\n", virq + i, (int)hwirq + i))
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return -EINVAL;
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};
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for (i = 0; i < count; i++, virq++, hwirq++) {
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struct irq_data *irq_data = irq_get_irq_data(virq);
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irq_data->hwirq = hwirq;
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irq_data->domain = domain;
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if (domain->ops->map) {
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ret = domain->ops->map(domain, virq, hwirq);
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if (ret != 0) {
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pr_err("irq-%i==>hwirq-0x%lx mapping failed: %d\n",
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virq, hwirq, ret);
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WARN_ON(1);
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irq_data->domain = NULL;
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irq_data->hwirq = 0;
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goto err_unmap;
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}
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}
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switch (domain->revmap_type) {
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case IRQ_DOMAIN_MAP_LINEAR:
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if (hwirq < domain->revmap_data.linear.size)
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domain->revmap_data.linear.revmap[hwirq] = virq;
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break;
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case IRQ_DOMAIN_MAP_TREE:
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mutex_lock(&revmap_trees_mutex);
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radix_tree_insert(&domain->revmap_data.tree, hwirq, irq_data);
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mutex_unlock(&revmap_trees_mutex);
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break;
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}
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irq_clear_status_flags(virq, IRQ_NOREQUEST);
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}
|
|
|
|
return 0;
|
|
|
|
err_unmap:
|
|
irq_domain_disassociate_many(domain, irq_base, i);
|
|
return -EINVAL;
|
|
}
|
|
EXPORT_SYMBOL_GPL(irq_domain_associate_many);
|
|
|
|
/**
|
|
* irq_create_direct_mapping() - Allocate an irq for direct mapping
|
|
* @domain: domain to allocate the irq for or NULL for default domain
|
|
*
|
|
* This routine is used for irq controllers which can choose the hardware
|
|
* interrupt numbers they generate. In such a case it's simplest to use
|
|
* the linux irq as the hardware interrupt number.
|
|
*/
|
|
unsigned int irq_create_direct_mapping(struct irq_domain *domain)
|
|
{
|
|
unsigned int virq;
|
|
|
|
if (domain == NULL)
|
|
domain = irq_default_domain;
|
|
|
|
if (WARN_ON(!domain || domain->revmap_type != IRQ_DOMAIN_MAP_NOMAP))
|
|
return 0;
|
|
|
|
virq = irq_alloc_desc_from(1, of_node_to_nid(domain->of_node));
|
|
if (!virq) {
|
|
pr_debug("create_direct virq allocation failed\n");
|
|
return 0;
|
|
}
|
|
if (virq >= domain->revmap_data.nomap.max_irq) {
|
|
pr_err("ERROR: no free irqs available below %i maximum\n",
|
|
domain->revmap_data.nomap.max_irq);
|
|
irq_free_desc(virq);
|
|
return 0;
|
|
}
|
|
pr_debug("create_direct obtained virq %d\n", virq);
|
|
|
|
if (irq_domain_associate(domain, virq, virq)) {
|
|
irq_free_desc(virq);
|
|
return 0;
|
|
}
|
|
|
|
return virq;
|
|
}
|
|
EXPORT_SYMBOL_GPL(irq_create_direct_mapping);
|
|
|
|
/**
|
|
* irq_create_mapping() - Map a hardware interrupt into linux irq space
|
|
* @domain: domain owning this hardware interrupt or NULL for default domain
|
|
* @hwirq: hardware irq number in that domain space
|
|
*
|
|
* Only one mapping per hardware interrupt is permitted. Returns a linux
|
|
* irq number.
|
|
* If the sense/trigger is to be specified, set_irq_type() should be called
|
|
* on the number returned from that call.
|
|
*/
|
|
unsigned int irq_create_mapping(struct irq_domain *domain,
|
|
irq_hw_number_t hwirq)
|
|
{
|
|
unsigned int hint;
|
|
int virq;
|
|
|
|
pr_debug("irq_create_mapping(0x%p, 0x%lx)\n", domain, hwirq);
|
|
|
|
/* Look for default domain if nececssary */
|
|
if (domain == NULL)
|
|
domain = irq_default_domain;
|
|
if (domain == NULL) {
|
|
pr_warning("irq_create_mapping called for"
|
|
" NULL domain, hwirq=%lx\n", hwirq);
|
|
WARN_ON(1);
|
|
return 0;
|
|
}
|
|
pr_debug("-> using domain @%p\n", domain);
|
|
|
|
/* Check if mapping already exists */
|
|
virq = irq_find_mapping(domain, hwirq);
|
|
if (virq) {
|
|
pr_debug("-> existing mapping on virq %d\n", virq);
|
|
return virq;
|
|
}
|
|
|
|
/* Get a virtual interrupt number */
|
|
if (domain->revmap_type == IRQ_DOMAIN_MAP_LEGACY)
|
|
return irq_domain_legacy_revmap(domain, hwirq);
|
|
|
|
/* Allocate a virtual interrupt number */
|
|
hint = hwirq % nr_irqs;
|
|
if (hint == 0)
|
|
hint++;
|
|
virq = irq_alloc_desc_from(hint, of_node_to_nid(domain->of_node));
|
|
if (virq <= 0)
|
|
virq = irq_alloc_desc_from(1, of_node_to_nid(domain->of_node));
|
|
if (virq <= 0) {
|
|
pr_debug("-> virq allocation failed\n");
|
|
return 0;
|
|
}
|
|
|
|
if (irq_domain_associate(domain, virq, hwirq)) {
|
|
irq_free_desc(virq);
|
|
return 0;
|
|
}
|
|
|
|
pr_debug("irq %lu on domain %s mapped to virtual irq %u\n",
|
|
hwirq, of_node_full_name(domain->of_node), virq);
|
|
|
|
return virq;
|
|
}
|
|
EXPORT_SYMBOL_GPL(irq_create_mapping);
|
|
|
|
/**
|
|
* irq_create_strict_mappings() - Map a range of hw irqs to fixed linux irqs
|
|
* @domain: domain owning the interrupt range
|
|
* @irq_base: beginning of linux IRQ range
|
|
* @hwirq_base: beginning of hardware IRQ range
|
|
* @count: Number of interrupts to map
|
|
*
|
|
* This routine is used for allocating and mapping a range of hardware
|
|
* irqs to linux irqs where the linux irq numbers are at pre-defined
|
|
* locations. For use by controllers that already have static mappings
|
|
* to insert in to the domain.
|
|
*
|
|
* Non-linear users can use irq_create_identity_mapping() for IRQ-at-a-time
|
|
* domain insertion.
|
|
*
|
|
* 0 is returned upon success, while any failure to establish a static
|
|
* mapping is treated as an error.
|
|
*/
|
|
int irq_create_strict_mappings(struct irq_domain *domain, unsigned int irq_base,
|
|
irq_hw_number_t hwirq_base, int count)
|
|
{
|
|
int ret;
|
|
|
|
ret = irq_alloc_descs(irq_base, irq_base, count,
|
|
of_node_to_nid(domain->of_node));
|
|
if (unlikely(ret < 0))
|
|
return ret;
|
|
|
|
ret = irq_domain_associate_many(domain, irq_base, hwirq_base, count);
|
|
if (unlikely(ret < 0)) {
|
|
irq_free_descs(irq_base, count);
|
|
return ret;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL_GPL(irq_create_strict_mappings);
|
|
|
|
unsigned int irq_create_of_mapping(struct device_node *controller,
|
|
const u32 *intspec, unsigned int intsize)
|
|
{
|
|
struct irq_domain *domain;
|
|
irq_hw_number_t hwirq;
|
|
unsigned int type = IRQ_TYPE_NONE;
|
|
unsigned int virq;
|
|
|
|
domain = controller ? irq_find_host(controller) : irq_default_domain;
|
|
if (!domain) {
|
|
#ifdef CONFIG_MIPS
|
|
/*
|
|
* Workaround to avoid breaking interrupt controller drivers
|
|
* that don't yet register an irq_domain. This is temporary
|
|
* code. ~~~gcl, Feb 24, 2012
|
|
*
|
|
* Scheduled for removal in Linux v3.6. That should be enough
|
|
* time.
|
|
*/
|
|
if (intsize > 0)
|
|
return intspec[0];
|
|
#endif
|
|
pr_warning("no irq domain found for %s !\n",
|
|
of_node_full_name(controller));
|
|
return 0;
|
|
}
|
|
|
|
/* If domain has no translation, then we assume interrupt line */
|
|
if (domain->ops->xlate == NULL)
|
|
hwirq = intspec[0];
|
|
else {
|
|
if (domain->ops->xlate(domain, controller, intspec, intsize,
|
|
&hwirq, &type))
|
|
return 0;
|
|
}
|
|
|
|
/* Create mapping */
|
|
virq = irq_create_mapping(domain, hwirq);
|
|
if (!virq)
|
|
return virq;
|
|
|
|
/* Set type if specified and different than the current one */
|
|
if (type != IRQ_TYPE_NONE &&
|
|
type != (irqd_get_trigger_type(irq_get_irq_data(virq))))
|
|
irq_set_irq_type(virq, type);
|
|
return virq;
|
|
}
|
|
EXPORT_SYMBOL_GPL(irq_create_of_mapping);
|
|
|
|
/**
|
|
* irq_dispose_mapping() - Unmap an interrupt
|
|
* @virq: linux irq number of the interrupt to unmap
|
|
*/
|
|
void irq_dispose_mapping(unsigned int virq)
|
|
{
|
|
struct irq_data *irq_data = irq_get_irq_data(virq);
|
|
struct irq_domain *domain;
|
|
|
|
if (!virq || !irq_data)
|
|
return;
|
|
|
|
domain = irq_data->domain;
|
|
if (WARN_ON(domain == NULL))
|
|
return;
|
|
|
|
/* Never unmap legacy interrupts */
|
|
if (domain->revmap_type == IRQ_DOMAIN_MAP_LEGACY)
|
|
return;
|
|
|
|
irq_domain_disassociate_many(domain, virq, 1);
|
|
irq_free_desc(virq);
|
|
}
|
|
EXPORT_SYMBOL_GPL(irq_dispose_mapping);
|
|
|
|
/**
|
|
* irq_find_mapping() - Find a linux irq from an hw irq number.
|
|
* @domain: domain owning this hardware interrupt
|
|
* @hwirq: hardware irq number in that domain space
|
|
*/
|
|
unsigned int irq_find_mapping(struct irq_domain *domain,
|
|
irq_hw_number_t hwirq)
|
|
{
|
|
struct irq_data *data;
|
|
|
|
/* Look for default domain if nececssary */
|
|
if (domain == NULL)
|
|
domain = irq_default_domain;
|
|
if (domain == NULL)
|
|
return 0;
|
|
|
|
switch (domain->revmap_type) {
|
|
case IRQ_DOMAIN_MAP_LEGACY:
|
|
return irq_domain_legacy_revmap(domain, hwirq);
|
|
case IRQ_DOMAIN_MAP_LINEAR:
|
|
return irq_linear_revmap(domain, hwirq);
|
|
case IRQ_DOMAIN_MAP_TREE:
|
|
rcu_read_lock();
|
|
data = radix_tree_lookup(&domain->revmap_data.tree, hwirq);
|
|
rcu_read_unlock();
|
|
if (data)
|
|
return data->irq;
|
|
break;
|
|
case IRQ_DOMAIN_MAP_NOMAP:
|
|
data = irq_get_irq_data(hwirq);
|
|
if (data && (data->domain == domain) && (data->hwirq == hwirq))
|
|
return hwirq;
|
|
break;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL_GPL(irq_find_mapping);
|
|
|
|
/**
|
|
* irq_linear_revmap() - Find a linux irq from a hw irq number.
|
|
* @domain: domain owning this hardware interrupt
|
|
* @hwirq: hardware irq number in that domain space
|
|
*
|
|
* This is a fast path that can be called directly by irq controller code to
|
|
* save a handful of instructions.
|
|
*/
|
|
unsigned int irq_linear_revmap(struct irq_domain *domain,
|
|
irq_hw_number_t hwirq)
|
|
{
|
|
BUG_ON(domain->revmap_type != IRQ_DOMAIN_MAP_LINEAR);
|
|
|
|
/* Check revmap bounds; complain if exceeded */
|
|
if (WARN_ON(hwirq >= domain->revmap_data.linear.size))
|
|
return 0;
|
|
|
|
return domain->revmap_data.linear.revmap[hwirq];
|
|
}
|
|
EXPORT_SYMBOL_GPL(irq_linear_revmap);
|
|
|
|
#ifdef CONFIG_IRQ_DOMAIN_DEBUG
|
|
static int virq_debug_show(struct seq_file *m, void *private)
|
|
{
|
|
unsigned long flags;
|
|
struct irq_desc *desc;
|
|
const char *p;
|
|
static const char none[] = "none";
|
|
void *data;
|
|
int i;
|
|
|
|
seq_printf(m, "%-5s %-7s %-15s %-*s %s\n", "irq", "hwirq",
|
|
"chip name", (int)(2 * sizeof(void *) + 2), "chip data",
|
|
"domain name");
|
|
|
|
for (i = 1; i < nr_irqs; i++) {
|
|
desc = irq_to_desc(i);
|
|
if (!desc)
|
|
continue;
|
|
|
|
raw_spin_lock_irqsave(&desc->lock, flags);
|
|
|
|
if (desc->action && desc->action->handler) {
|
|
struct irq_chip *chip;
|
|
|
|
seq_printf(m, "%5d ", i);
|
|
seq_printf(m, "0x%05lx ", desc->irq_data.hwirq);
|
|
|
|
chip = irq_desc_get_chip(desc);
|
|
if (chip && chip->name)
|
|
p = chip->name;
|
|
else
|
|
p = none;
|
|
seq_printf(m, "%-15s ", p);
|
|
|
|
data = irq_desc_get_chip_data(desc);
|
|
seq_printf(m, data ? "0x%p " : " %p ", data);
|
|
|
|
if (desc->irq_data.domain)
|
|
p = of_node_full_name(desc->irq_data.domain->of_node);
|
|
else
|
|
p = none;
|
|
seq_printf(m, "%s\n", p);
|
|
}
|
|
|
|
raw_spin_unlock_irqrestore(&desc->lock, flags);
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int virq_debug_open(struct inode *inode, struct file *file)
|
|
{
|
|
return single_open(file, virq_debug_show, inode->i_private);
|
|
}
|
|
|
|
static const struct file_operations virq_debug_fops = {
|
|
.open = virq_debug_open,
|
|
.read = seq_read,
|
|
.llseek = seq_lseek,
|
|
.release = single_release,
|
|
};
|
|
|
|
static int __init irq_debugfs_init(void)
|
|
{
|
|
if (debugfs_create_file("irq_domain_mapping", S_IRUGO, NULL,
|
|
NULL, &virq_debug_fops) == NULL)
|
|
return -ENOMEM;
|
|
|
|
return 0;
|
|
}
|
|
__initcall(irq_debugfs_init);
|
|
#endif /* CONFIG_IRQ_DOMAIN_DEBUG */
|
|
|
|
/**
|
|
* irq_domain_xlate_onecell() - Generic xlate for direct one cell bindings
|
|
*
|
|
* Device Tree IRQ specifier translation function which works with one cell
|
|
* bindings where the cell value maps directly to the hwirq number.
|
|
*/
|
|
int irq_domain_xlate_onecell(struct irq_domain *d, struct device_node *ctrlr,
|
|
const u32 *intspec, unsigned int intsize,
|
|
unsigned long *out_hwirq, unsigned int *out_type)
|
|
{
|
|
if (WARN_ON(intsize < 1))
|
|
return -EINVAL;
|
|
*out_hwirq = intspec[0];
|
|
*out_type = IRQ_TYPE_NONE;
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL_GPL(irq_domain_xlate_onecell);
|
|
|
|
/**
|
|
* irq_domain_xlate_twocell() - Generic xlate for direct two cell bindings
|
|
*
|
|
* Device Tree IRQ specifier translation function which works with two cell
|
|
* bindings where the cell values map directly to the hwirq number
|
|
* and linux irq flags.
|
|
*/
|
|
int irq_domain_xlate_twocell(struct irq_domain *d, struct device_node *ctrlr,
|
|
const u32 *intspec, unsigned int intsize,
|
|
irq_hw_number_t *out_hwirq, unsigned int *out_type)
|
|
{
|
|
if (WARN_ON(intsize < 2))
|
|
return -EINVAL;
|
|
*out_hwirq = intspec[0];
|
|
*out_type = intspec[1] & IRQ_TYPE_SENSE_MASK;
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL_GPL(irq_domain_xlate_twocell);
|
|
|
|
/**
|
|
* irq_domain_xlate_onetwocell() - Generic xlate for one or two cell bindings
|
|
*
|
|
* Device Tree IRQ specifier translation function which works with either one
|
|
* or two cell bindings where the cell values map directly to the hwirq number
|
|
* and linux irq flags.
|
|
*
|
|
* Note: don't use this function unless your interrupt controller explicitly
|
|
* supports both one and two cell bindings. For the majority of controllers
|
|
* the _onecell() or _twocell() variants above should be used.
|
|
*/
|
|
int irq_domain_xlate_onetwocell(struct irq_domain *d,
|
|
struct device_node *ctrlr,
|
|
const u32 *intspec, unsigned int intsize,
|
|
unsigned long *out_hwirq, unsigned int *out_type)
|
|
{
|
|
if (WARN_ON(intsize < 1))
|
|
return -EINVAL;
|
|
*out_hwirq = intspec[0];
|
|
*out_type = (intsize > 1) ? intspec[1] : IRQ_TYPE_NONE;
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL_GPL(irq_domain_xlate_onetwocell);
|
|
|
|
const struct irq_domain_ops irq_domain_simple_ops = {
|
|
.xlate = irq_domain_xlate_onetwocell,
|
|
};
|
|
EXPORT_SYMBOL_GPL(irq_domain_simple_ops);
|
|
|
|
#ifdef CONFIG_OF_IRQ
|
|
void irq_domain_generate_simple(const struct of_device_id *match,
|
|
u64 phys_base, unsigned int irq_start)
|
|
{
|
|
struct device_node *node;
|
|
pr_debug("looking for phys_base=%llx, irq_start=%i\n",
|
|
(unsigned long long) phys_base, (int) irq_start);
|
|
node = of_find_matching_node_by_address(NULL, match, phys_base);
|
|
if (node)
|
|
irq_domain_add_legacy(node, 32, irq_start, 0,
|
|
&irq_domain_simple_ops, NULL);
|
|
}
|
|
EXPORT_SYMBOL_GPL(irq_domain_generate_simple);
|
|
#endif
|