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#define pr_fmt(fmt) "irq: " fmt

#include <linux/debugfs.h>
#include <linux/hardirq.h>
#include <linux/interrupt.h>
#include <linux/irq.h>
#include <linux/irqdesc.h>
#include <linux/irqdomain.h>
#include <linux/module.h>
#include <linux/mutex.h>
#include <linux/of.h>
#include <linux/of_address.h>
#include <linux/topology.h>
#include <linux/seq_file.h>
#include <linux/slab.h>
#include <linux/smp.h>
#include <linux/fs.h>

#define IRQ_DOMAIN_MAP_LEGACY 0 /* driver allocated fixed range of irqs.
* ie. legacy 8259, gets irqs 1..15 */
#define IRQ_DOMAIN_MAP_NOMAP 1 /* no fast reverse mapping */
#define IRQ_DOMAIN_MAP_LINEAR 2 /* linear map of interrupts */
#define IRQ_DOMAIN_MAP_TREE 3 /* radix tree */

static LIST_HEAD(irq_domain_list);
static DEFINE_MUTEX(irq_domain_mutex);

static DEFINE_MUTEX(revmap_trees_mutex);
static struct irq_domain *irq_default_domain;

/**
* irq_domain_alloc() - Allocate a new irq_domain data structure
* @of_node: optional device-tree node of the interrupt controller
* @revmap_type: type of reverse mapping to use
* @ops: map/unmap domain callbacks
* @host_data: Controller private data pointer
*
* Allocates and initialize and irq_domain structure. Caller is expected to
* register allocated irq_domain with irq_domain_register(). Returns pointer
* to IRQ domain, or NULL on failure.
*/
static struct irq_domain *irq_domain_alloc(struct device_node *of_node,
unsigned int revmap_type,
const struct irq_domain_ops *ops,
void *host_data)
{
struct irq_domain *domain;

domain = kzalloc_node(sizeof(*domain), GFP_KERNEL,
of_node_to_nid(of_node));
if (WARN_ON(!domain))
return NULL;

/* Fill structure */
domain->revmap_type = revmap_type;
domain->ops = ops;
domain->host_data = host_data;
domain->of_node = of_node_get(of_node);

return domain;
}

static void irq_domain_free(struct irq_domain *domain)
{
of_node_put(domain->of_node);
kfree(domain);
}

static void irq_domain_add(struct irq_domain *domain)
{
mutex_lock(&irq_domain_mutex);
list_add(&domain->link, &irq_domain_list);
mutex_unlock(&irq_domain_mutex);
pr_debug("Allocated domain of type %d @0x%p\n",
domain->revmap_type, domain);
}

/**
* irq_domain_remove() - Remove an irq domain.
* @domain: domain to remove
*
* This routine is used to remove an irq domain. The caller must ensure
* that all mappings within the domain have been disposed of prior to
* use, depending on the revmap type.
*/
void irq_domain_remove(struct irq_domain *domain)
{
mutex_lock(&irq_domain_mutex);

switch (domain->revmap_type) {
case IRQ_DOMAIN_MAP_LEGACY:
/*
* Legacy domains don't manage their own irq_desc
* allocations, we expect the caller to handle irq_desc
* freeing on their own.
*/
break;
case IRQ_DOMAIN_MAP_TREE:
/*
* radix_tree_delete() takes care of destroying the root
* node when all entries are removed. Shout if there are
* any mappings left.
*/
WARN_ON(domain->revmap_data.tree.height);
break;
case IRQ_DOMAIN_MAP_LINEAR:
kfree(domain->revmap_data.linear.revmap);
domain->revmap_data.linear.size = 0;
break;
case IRQ_DOMAIN_MAP_NOMAP:
break;
}

list_del(&domain->link);

/*
* If the going away domain is the default one, reset it.
*/
if (unlikely(irq_default_domain == domain))
irq_set_default_host(NULL);

mutex_unlock(&irq_domain_mutex);

pr_debug("Removed domain of type %d @0x%p\n",
domain->revmap_type, domain);

irq_domain_free(domain);
}
EXPORT_SYMBOL_GPL(irq_domain_remove);

static unsigned int irq_domain_legacy_revmap(struct irq_domain *domain,
irq_hw_number_t hwirq)
{
irq_hw_number_t first_hwirq = domain->revmap_data.legacy.first_hwirq;
int size = domain->revmap_data.legacy.size;

if (WARN_ON(hwirq < first_hwirq || hwirq >= first_hwirq + size))
return 0;
return hwirq - first_hwirq + domain->revmap_data.legacy.first_irq;
}

/**
* irq_domain_add_simple() - Allocate and register a simple irq_domain.
* @of_node: pointer to interrupt controller's device tree node.
* @size: total number of irqs in mapping
* @first_irq: first number of irq block assigned to the domain
* @ops: map/unmap domain callbacks
* @host_data: Controller private data pointer
*
* Allocates a legacy irq_domain if irq_base is positive or a linear
* domain otherwise.
*
* This is intended to implement the expected behaviour for most
* interrupt controllers which is that a linear mapping should
* normally be used unless the system requires a legacy mapping in
* order to support supplying interrupt numbers during non-DT
* registration of devices.
*/
struct irq_domain *irq_domain_add_simple(struct device_node *of_node,
unsigned int size,
unsigned int first_irq,
const struct irq_domain_ops *ops,
void *host_data)
{
if (first_irq > 0)
return irq_domain_add_legacy(of_node, size, first_irq, 0,
ops, host_data);
else
return irq_domain_add_linear(of_node, size, ops, host_data);
}

/**
* irq_domain_add_legacy() - Allocate and register a legacy revmap irq_domain.
* @of_node: pointer to interrupt controller's device tree node.
* @size: total number of irqs in legacy mapping
* @first_irq: first number of irq block assigned to the domain
* @first_hwirq: first hwirq number to use for the translation. Should normally
* be '0', but a positive integer can be used if the effective
* hwirqs numbering does not begin at zero.
* @ops: map/unmap domain callbacks
* @host_data: Controller private data pointer
*
* Note: the map() callback will be called before this function returns
* for all legacy interrupts except 0 (which is always the invalid irq for
* a legacy controller).
*/
struct irq_domain *irq_domain_add_legacy(struct device_node *of_node,
unsigned int size,
unsigned int first_irq,
irq_hw_number_t first_hwirq,
const struct irq_domain_ops *ops,
void *host_data)
{
struct irq_domain *domain;
unsigned int i;

domain = irq_domain_alloc(of_node, IRQ_DOMAIN_MAP_LEGACY, ops, host_data);
if (!domain)
return NULL;

domain->revmap_data.legacy.first_irq = first_irq;
domain->revmap_data.legacy.first_hwirq = first_hwirq;
domain->revmap_data.legacy.size = size;

mutex_lock(&irq_domain_mutex);
/* Verify that all the irqs are available */
for (i = 0; i < size; i++) {
int irq = first_irq + i;
struct irq_data *irq_data = irq_get_irq_data(irq);

if (WARN_ON(!irq_data || irq_data->domain)) {
mutex_unlock(&irq_domain_mutex);
irq_domain_free(domain);
return NULL;
}
}

/* Claim all of the irqs before registering a legacy domain */
for (i = 0; i < size; i++) {
struct irq_data *irq_data = irq_get_irq_data(first_irq + i);
irq_data->hwirq = first_hwirq + i;
irq_data->domain = domain;
}
mutex_unlock(&irq_domain_mutex);

for (i = 0; i < size; i++) {
int irq = first_irq + i;
int hwirq = first_hwirq + i;

/* IRQ0 gets ignored */
if (!irq)
continue;

/* Legacy flags are left to default at this point,
* one can then use irq_create_mapping() to
* explicitly change them
*/
if (ops->map)
ops->map(domain, irq, hwirq);

/* Clear norequest flags */
irq_clear_status_flags(irq, IRQ_NOREQUEST);
}

irq_domain_add(domain);
return domain;
}
EXPORT_SYMBOL_GPL(irq_domain_add_legacy);

/**
* irq_domain_add_linear() - Allocate and register a linear revmap irq_domain.
* @of_node: pointer to interrupt controller's device tree node.
* @size: Number of interrupts in the domain.
* @ops: map/unmap domain callbacks
* @host_data: Controller private data pointer
*/
struct irq_domain *irq_domain_add_linear(struct device_node *of_node,
unsigned int size,
const struct irq_domain_ops *ops,
void *host_data)
{
struct irq_domain *domain;
unsigned int *revmap;

revmap = kzalloc_node(sizeof(*revmap) * size, GFP_KERNEL,
of_node_to_nid(of_node));
if (WARN_ON(!revmap))
return NULL;

domain = irq_domain_alloc(of_node, IRQ_DOMAIN_MAP_LINEAR, ops, host_data);
if (!domain) {
kfree(revmap);
return NULL;
}
domain->revmap_data.linear.size = size;
domain->revmap_data.linear.revmap = revmap;
irq_domain_add(domain);
return domain;
}
EXPORT_SYMBOL_GPL(irq_domain_add_linear);

struct irq_domain *irq_domain_add_nomap(struct device_node *of_node,
unsigned int max_irq,
const struct irq_domain_ops *ops,
void *host_data)
{
struct irq_domain *domain = irq_domain_alloc(of_node,
IRQ_DOMAIN_MAP_NOMAP, ops, host_data);
if (domain) {
domain->revmap_data.nomap.max_irq = max_irq ? max_irq : ~0;
irq_domain_add(domain);
}
return domain;
}
EXPORT_SYMBOL_GPL(irq_domain_add_nomap);

/**
* irq_domain_add_tree()
* @of_node: pointer to interrupt controller's device tree node.
* @ops: map/unmap domain callbacks
*
* Note: The radix tree will be allocated later during boot automatically
* (the reverse mapping will use the slow path until that happens).
*/
struct irq_domain *irq_domain_add_tree(struct device_node *of_node,
const struct irq_domain_ops *ops,
void *host_data)
{
struct irq_domain *domain = irq_domain_alloc(of_node,
IRQ_DOMAIN_MAP_TREE, ops, host_data);
if (domain) {
INIT_RADIX_TREE(&domain->revmap_data.tree, GFP_KERNEL);
irq_domain_add(domain);
}
return domain;
}
EXPORT_SYMBOL_GPL(irq_domain_add_tree);

/**
* irq_find_host() - Locates a domain for a given device node
* @node: device-tree node of the interrupt controller
*/
struct irq_domain *irq_find_host(struct device_node *node)
{
struct irq_domain *h, *found = NULL;
int rc;

/* We might want to match the legacy controller last since
* it might potentially be set to match all interrupts in
* the absence of a device node. This isn't a problem so far
* yet though...
*/
mutex_lock(&irq_domain_mutex);
list_for_each_entry(h, &irq_domain_list, link) {
if (h->ops->match)
rc = h->ops->match(h, node);
else
rc = (h->of_node != NULL) && (h->of_node == node);

if (rc) {
found = h;
break;
}
}
mutex_unlock(&irq_domain_mutex);
return found;
}
EXPORT_SYMBOL_GPL(irq_find_host);

/**
* irq_set_default_host() - Set a "default" irq domain
* @domain: default domain pointer
*
* For convenience, it's possible to set a "default" domain that will be used
* whenever NULL is passed to irq_create_mapping(). It makes life easier for
* platforms that want to manipulate a few hard coded interrupt numbers that
* aren't properly represented in the device-tree.
*/
void irq_set_default_host(struct irq_domain *domain)
{
pr_debug("Default domain set to @0x%p\n", domain);

irq_default_domain = domain;
}
EXPORT_SYMBOL_GPL(irq_set_default_host);

static void irq_domain_disassociate_many(struct irq_domain *domain,
unsigned int irq_base, int count)
{
/*
* disassociate in reverse order;
* not strictly necessary, but nice for unwinding
*/
while (count--) {
int irq = irq_base + count;
struct irq_data *irq_data = irq_get_irq_data(irq);
irq_hw_number_t hwirq = irq_data->hwirq;

if (WARN_ON(!irq_data || irq_data->domain != domain))
continue;

irq_set_status_flags(irq, IRQ_NOREQUEST);

/* remove chip and handler */
irq_set_chip_and_handler(irq, NULL, NULL);

/* Make sure it's completed */
synchronize_irq(irq);

/* Tell the PIC about it */
if (domain->ops->unmap)
domain->ops->unmap(domain, irq);
smp_mb();

irq_data->domain = NULL;
irq_data->hwirq = 0;

/* Clear reverse map */
switch(domain->revmap_type) {
case IRQ_DOMAIN_MAP_LINEAR:
if (hwirq < domain->revmap_data.linear.size)
domain->revmap_data.linear.revmap[hwirq] = 0;
break;
case IRQ_DOMAIN_MAP_TREE:
mutex_lock(&revmap_trees_mutex);
radix_tree_delete(&domain->revmap_data.tree, hwirq);
mutex_unlock(&revmap_trees_mutex);
break;
}
}
}

int irq_domain_associate_many(struct irq_domain *domain, unsigned int irq_base,
irq_hw_number_t hwirq_base, int count)
{
unsigned int virq = irq_base;
irq_hw_number_t hwirq = hwirq_base;
int i, ret;

pr_debug("%s(%s, irqbase=%i, hwbase=%i, count=%i)\n", __func__,
of_node_full_name(domain->of_node), irq_base, (int)hwirq_base, count);

for (i = 0; i < count; i++) {
struct irq_data *irq_data = irq_get_irq_data(virq + i);

if (WARN(!irq_data, "error: irq_desc not allocated; "
"irq=%i hwirq=0x%x\n", virq + i, (int)hwirq + i))
return -EINVAL;
if (WARN(irq_data->domain, "error: irq_desc already associated; "
"irq=%i hwirq=0x%x\n", virq + i, (int)hwirq + i))
return -EINVAL;
};

for (i = 0; i < count; i++, virq++, hwirq++) {
struct irq_data *irq_data = irq_get_irq_data(virq);

irq_data->hwirq = hwirq;
irq_data->domain = domain;
if (domain->ops->map) {
ret = domain->ops->map(domain, virq, hwirq);
if (ret != 0) {
pr_err("irq-%i==>hwirq-0x%lx mapping failed: %d\n",
virq, hwirq, ret);
WARN_ON(1);
irq_data->domain = NULL;
irq_data->hwirq = 0;
goto err_unmap;
}
}

switch (domain->revmap_type) {
case IRQ_DOMAIN_MAP_LINEAR:
if (hwirq < domain->revmap_data.linear.size)
domain->revmap_data.linear.revmap[hwirq] = virq;
break;
case IRQ_DOMAIN_MAP_TREE:
mutex_lock(&revmap_trees_mutex);
radix_tree_insert(&domain->revmap_data.tree, hwirq, irq_data);
mutex_unlock(&revmap_trees_mutex);
break;
}

irq_clear_status_flags(virq, IRQ_NOREQUEST);
}

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
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