linux/kernel/irq/irqdomain.c

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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. For the legacy domain, IRQ descriptors will also
* be allocated.
*
* 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) {
int irq_base;
if (IS_ENABLED(CONFIG_SPARSE_IRQ)) {
/*
* Set the descriptor allocator to search for a
* 1-to-1 mapping, such as irq_alloc_desc_at().
* Use of_node_to_nid() which is defined to
* numa_node_id() on platforms that have no custom
* implementation.
*/
irq_base = irq_alloc_descs(first_irq, first_irq, size,
of_node_to_nid(of_node));
if (irq_base < 0) {
pr_info("Cannot allocate irq_descs @ IRQ%d, assuming pre-allocated\n",
first_irq);
irq_base = first_irq;
}
} else
irq_base = first_irq;
return irq_domain_add_legacy(of_node, size, irq_base, 0,
ops, host_data);
}
/* A linear domain is the default */
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;
}
}
}
irqdomain: Support for static IRQ mapping and association. This adds a new strict mapping API for supporting creation of linux IRQs at existing positions within the domain. The new routines are as follows: For dynamic allocation and insertion to specified ranges: - irq_create_identity_mapping() - irq_create_strict_mappings() These will allocate and associate a range of linux IRQs at the specified location. This can be used by controllers that have their own static linux IRQ definitions to map a hwirq range to, as well as for platforms that wish to establish 1:1 identity mapping between linux and hwirq space. For insertion to specified ranges by platforms that do their own irq_desc management: - irq_domain_associate() - irq_domain_associate_many() These in turn call back in to the domain's ->map() routine, for further processing by the platform. Disassociation of IRQs get handled through irq_dispose_mapping() as normal. With these in place it should be possible to begin migration of legacy IRQ domains to linear ones, without requiring special handling for static vs dynamic IRQ definitions in DT vs non-DT paths. This also makes it possible for domains with static mappings to adopt whichever tree model best fits their needs, rather than simply restricting them to linear revmaps. Signed-off-by: Paul Mundt <lethal@linux-sh.org> [grant.likely: Reorganized irq_domain_associate{,_many} to have all logic in one place] [grant.likely: Add error checking for unallocated irq_descs at associate time] Signed-off-by: Grant Likely <grant.likely@secretlab.ca> Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: Rob Herring <rob.herring@calxeda.com>
2012-06-17 22:17:04 +00:00
int irq_domain_associate_many(struct irq_domain *domain, unsigned int irq_base,
irq_hw_number_t hwirq_base, int count)
{
irqdomain: Support for static IRQ mapping and association. This adds a new strict mapping API for supporting creation of linux IRQs at existing positions within the domain. The new routines are as follows: For dynamic allocation and insertion to specified ranges: - irq_create_identity_mapping() - irq_create_strict_mappings() These will allocate and associate a range of linux IRQs at the specified location. This can be used by controllers that have their own static linux IRQ definitions to map a hwirq range to, as well as for platforms that wish to establish 1:1 identity mapping between linux and hwirq space. For insertion to specified ranges by platforms that do their own irq_desc management: - irq_domain_associate() - irq_domain_associate_many() These in turn call back in to the domain's ->map() routine, for further processing by the platform. Disassociation of IRQs get handled through irq_dispose_mapping() as normal. With these in place it should be possible to begin migration of legacy IRQ domains to linear ones, without requiring special handling for static vs dynamic IRQ definitions in DT vs non-DT paths. This also makes it possible for domains with static mappings to adopt whichever tree model best fits their needs, rather than simply restricting them to linear revmaps. Signed-off-by: Paul Mundt <lethal@linux-sh.org> [grant.likely: Reorganized irq_domain_associate{,_many} to have all logic in one place] [grant.likely: Add error checking for unallocated irq_descs at associate time] Signed-off-by: Grant Likely <grant.likely@secretlab.ca> Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: Rob Herring <rob.herring@calxeda.com>
2012-06-17 22:17:04 +00:00
unsigned int virq = irq_base;
irq_hw_number_t hwirq = hwirq_base;
int i, ret;
irqdomain: Support for static IRQ mapping and association. This adds a new strict mapping API for supporting creation of linux IRQs at existing positions within the domain. The new routines are as follows: For dynamic allocation and insertion to specified ranges: - irq_create_identity_mapping() - irq_create_strict_mappings() These will allocate and associate a range of linux IRQs at the specified location. This can be used by controllers that have their own static linux IRQ definitions to map a hwirq range to, as well as for platforms that wish to establish 1:1 identity mapping between linux and hwirq space. For insertion to specified ranges by platforms that do their own irq_desc management: - irq_domain_associate() - irq_domain_associate_many() These in turn call back in to the domain's ->map() routine, for further processing by the platform. Disassociation of IRQs get handled through irq_dispose_mapping() as normal. With these in place it should be possible to begin migration of legacy IRQ domains to linear ones, without requiring special handling for static vs dynamic IRQ definitions in DT vs non-DT paths. This also makes it possible for domains with static mappings to adopt whichever tree model best fits their needs, rather than simply restricting them to linear revmaps. Signed-off-by: Paul Mundt <lethal@linux-sh.org> [grant.likely: Reorganized irq_domain_associate{,_many} to have all logic in one place] [grant.likely: Add error checking for unallocated irq_descs at associate time] Signed-off-by: Grant Likely <grant.likely@secretlab.ca> Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: Rob Herring <rob.herring@calxeda.com>
2012-06-17 22:17:04 +00:00
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);
irqdomain: Support for static IRQ mapping and association. This adds a new strict mapping API for supporting creation of linux IRQs at existing positions within the domain. The new routines are as follows: For dynamic allocation and insertion to specified ranges: - irq_create_identity_mapping() - irq_create_strict_mappings() These will allocate and associate a range of linux IRQs at the specified location. This can be used by controllers that have their own static linux IRQ definitions to map a hwirq range to, as well as for platforms that wish to establish 1:1 identity mapping between linux and hwirq space. For insertion to specified ranges by platforms that do their own irq_desc management: - irq_domain_associate() - irq_domain_associate_many() These in turn call back in to the domain's ->map() routine, for further processing by the platform. Disassociation of IRQs get handled through irq_dispose_mapping() as normal. With these in place it should be possible to begin migration of legacy IRQ domains to linear ones, without requiring special handling for static vs dynamic IRQ definitions in DT vs non-DT paths. This also makes it possible for domains with static mappings to adopt whichever tree model best fits their needs, rather than simply restricting them to linear revmaps. Signed-off-by: Paul Mundt <lethal@linux-sh.org> [grant.likely: Reorganized irq_domain_associate{,_many} to have all logic in one place] [grant.likely: Add error checking for unallocated irq_descs at associate time] Signed-off-by: Grant Likely <grant.likely@secretlab.ca> Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: Rob Herring <rob.herring@calxeda.com>
2012-06-17 22:17:04 +00:00
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;
}
irqdomain: Support for static IRQ mapping and association. This adds a new strict mapping API for supporting creation of linux IRQs at existing positions within the domain. The new routines are as follows: For dynamic allocation and insertion to specified ranges: - irq_create_identity_mapping() - irq_create_strict_mappings() These will allocate and associate a range of linux IRQs at the specified location. This can be used by controllers that have their own static linux IRQ definitions to map a hwirq range to, as well as for platforms that wish to establish 1:1 identity mapping between linux and hwirq space. For insertion to specified ranges by platforms that do their own irq_desc management: - irq_domain_associate() - irq_domain_associate_many() These in turn call back in to the domain's ->map() routine, for further processing by the platform. Disassociation of IRQs get handled through irq_dispose_mapping() as normal. With these in place it should be possible to begin migration of legacy IRQ domains to linear ones, without requiring special handling for static vs dynamic IRQ definitions in DT vs non-DT paths. This also makes it possible for domains with static mappings to adopt whichever tree model best fits their needs, rather than simply restricting them to linear revmaps. Signed-off-by: Paul Mundt <lethal@linux-sh.org> [grant.likely: Reorganized irq_domain_associate{,_many} to have all logic in one place] [grant.likely: Add error checking for unallocated irq_descs at associate time] Signed-off-by: Grant Likely <grant.likely@secretlab.ca> Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: Rob Herring <rob.herring@calxeda.com>
2012-06-17 22:17:04 +00:00
}
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);
irqdomain: Support for static IRQ mapping and association. This adds a new strict mapping API for supporting creation of linux IRQs at existing positions within the domain. The new routines are as follows: For dynamic allocation and insertion to specified ranges: - irq_create_identity_mapping() - irq_create_strict_mappings() These will allocate and associate a range of linux IRQs at the specified location. This can be used by controllers that have their own static linux IRQ definitions to map a hwirq range to, as well as for platforms that wish to establish 1:1 identity mapping between linux and hwirq space. For insertion to specified ranges by platforms that do their own irq_desc management: - irq_domain_associate() - irq_domain_associate_many() These in turn call back in to the domain's ->map() routine, for further processing by the platform. Disassociation of IRQs get handled through irq_dispose_mapping() as normal. With these in place it should be possible to begin migration of legacy IRQ domains to linear ones, without requiring special handling for static vs dynamic IRQ definitions in DT vs non-DT paths. This also makes it possible for domains with static mappings to adopt whichever tree model best fits their needs, rather than simply restricting them to linear revmaps. Signed-off-by: Paul Mundt <lethal@linux-sh.org> [grant.likely: Reorganized irq_domain_associate{,_many} to have all logic in one place] [grant.likely: Add error checking for unallocated irq_descs at associate time] Signed-off-by: Grant Likely <grant.likely@secretlab.ca> Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: Rob Herring <rob.herring@calxeda.com>
2012-06-17 22:17:04 +00:00
mutex_unlock(&revmap_trees_mutex);
break;
}
irqdomain: Support for static IRQ mapping and association. This adds a new strict mapping API for supporting creation of linux IRQs at existing positions within the domain. The new routines are as follows: For dynamic allocation and insertion to specified ranges: - irq_create_identity_mapping() - irq_create_strict_mappings() These will allocate and associate a range of linux IRQs at the specified location. This can be used by controllers that have their own static linux IRQ definitions to map a hwirq range to, as well as for platforms that wish to establish 1:1 identity mapping between linux and hwirq space. For insertion to specified ranges by platforms that do their own irq_desc management: - irq_domain_associate() - irq_domain_associate_many() These in turn call back in to the domain's ->map() routine, for further processing by the platform. Disassociation of IRQs get handled through irq_dispose_mapping() as normal. With these in place it should be possible to begin migration of legacy IRQ domains to linear ones, without requiring special handling for static vs dynamic IRQ definitions in DT vs non-DT paths. This also makes it possible for domains with static mappings to adopt whichever tree model best fits their needs, rather than simply restricting them to linear revmaps. Signed-off-by: Paul Mundt <lethal@linux-sh.org> [grant.likely: Reorganized irq_domain_associate{,_many} to have all logic in one place] [grant.likely: Add error checking for unallocated irq_descs at associate time] Signed-off-by: Grant Likely <grant.likely@secretlab.ca> Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: Rob Herring <rob.herring@calxeda.com>
2012-06-17 22:17:04 +00:00
irq_clear_status_flags(virq, IRQ_NOREQUEST);
}
return 0;
irqdomain: Support for static IRQ mapping and association. This adds a new strict mapping API for supporting creation of linux IRQs at existing positions within the domain. The new routines are as follows: For dynamic allocation and insertion to specified ranges: - irq_create_identity_mapping() - irq_create_strict_mappings() These will allocate and associate a range of linux IRQs at the specified location. This can be used by controllers that have their own static linux IRQ definitions to map a hwirq range to, as well as for platforms that wish to establish 1:1 identity mapping between linux and hwirq space. For insertion to specified ranges by platforms that do their own irq_desc management: - irq_domain_associate() - irq_domain_associate_many() These in turn call back in to the domain's ->map() routine, for further processing by the platform. Disassociation of IRQs get handled through irq_dispose_mapping() as normal. With these in place it should be possible to begin migration of legacy IRQ domains to linear ones, without requiring special handling for static vs dynamic IRQ definitions in DT vs non-DT paths. This also makes it possible for domains with static mappings to adopt whichever tree model best fits their needs, rather than simply restricting them to linear revmaps. Signed-off-by: Paul Mundt <lethal@linux-sh.org> [grant.likely: Reorganized irq_domain_associate{,_many} to have all logic in one place] [grant.likely: Add error checking for unallocated irq_descs at associate time] Signed-off-by: Grant Likely <grant.likely@secretlab.ca> Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: Rob Herring <rob.herring@calxeda.com>
2012-06-17 22:17:04 +00:00
err_unmap:
irq_domain_disassociate_many(domain, irq_base, i);
return -EINVAL;
}
irqdomain: Support for static IRQ mapping and association. This adds a new strict mapping API for supporting creation of linux IRQs at existing positions within the domain. The new routines are as follows: For dynamic allocation and insertion to specified ranges: - irq_create_identity_mapping() - irq_create_strict_mappings() These will allocate and associate a range of linux IRQs at the specified location. This can be used by controllers that have their own static linux IRQ definitions to map a hwirq range to, as well as for platforms that wish to establish 1:1 identity mapping between linux and hwirq space. For insertion to specified ranges by platforms that do their own irq_desc management: - irq_domain_associate() - irq_domain_associate_many() These in turn call back in to the domain's ->map() routine, for further processing by the platform. Disassociation of IRQs get handled through irq_dispose_mapping() as normal. With these in place it should be possible to begin migration of legacy IRQ domains to linear ones, without requiring special handling for static vs dynamic IRQ definitions in DT vs non-DT paths. This also makes it possible for domains with static mappings to adopt whichever tree model best fits their needs, rather than simply restricting them to linear revmaps. Signed-off-by: Paul Mundt <lethal@linux-sh.org> [grant.likely: Reorganized irq_domain_associate{,_many} to have all logic in one place] [grant.likely: Add error checking for unallocated irq_descs at associate time] Signed-off-by: Grant Likely <grant.likely@secretlab.ca> Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: Rob Herring <rob.herring@calxeda.com>
2012-06-17 22:17:04 +00:00
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);
irqdomain: Support for static IRQ mapping and association. This adds a new strict mapping API for supporting creation of linux IRQs at existing positions within the domain. The new routines are as follows: For dynamic allocation and insertion to specified ranges: - irq_create_identity_mapping() - irq_create_strict_mappings() These will allocate and associate a range of linux IRQs at the specified location. This can be used by controllers that have their own static linux IRQ definitions to map a hwirq range to, as well as for platforms that wish to establish 1:1 identity mapping between linux and hwirq space. For insertion to specified ranges by platforms that do their own irq_desc management: - irq_domain_associate() - irq_domain_associate_many() These in turn call back in to the domain's ->map() routine, for further processing by the platform. Disassociation of IRQs get handled through irq_dispose_mapping() as normal. With these in place it should be possible to begin migration of legacy IRQ domains to linear ones, without requiring special handling for static vs dynamic IRQ definitions in DT vs non-DT paths. This also makes it possible for domains with static mappings to adopt whichever tree model best fits their needs, rather than simply restricting them to linear revmaps. Signed-off-by: Paul Mundt <lethal@linux-sh.org> [grant.likely: Reorganized irq_domain_associate{,_many} to have all logic in one place] [grant.likely: Add error checking for unallocated irq_descs at associate time] Signed-off-by: Grant Likely <grant.likely@secretlab.ca> Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: Rob Herring <rob.herring@calxeda.com>
2012-06-17 22:17:04 +00:00
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;
}
irqdomain: Support for static IRQ mapping and association. This adds a new strict mapping API for supporting creation of linux IRQs at existing positions within the domain. The new routines are as follows: For dynamic allocation and insertion to specified ranges: - irq_create_identity_mapping() - irq_create_strict_mappings() These will allocate and associate a range of linux IRQs at the specified location. This can be used by controllers that have their own static linux IRQ definitions to map a hwirq range to, as well as for platforms that wish to establish 1:1 identity mapping between linux and hwirq space. For insertion to specified ranges by platforms that do their own irq_desc management: - irq_domain_associate() - irq_domain_associate_many() These in turn call back in to the domain's ->map() routine, for further processing by the platform. Disassociation of IRQs get handled through irq_dispose_mapping() as normal. With these in place it should be possible to begin migration of legacy IRQ domains to linear ones, without requiring special handling for static vs dynamic IRQ definitions in DT vs non-DT paths. This also makes it possible for domains with static mappings to adopt whichever tree model best fits their needs, rather than simply restricting them to linear revmaps. Signed-off-by: Paul Mundt <lethal@linux-sh.org> [grant.likely: Reorganized irq_domain_associate{,_many} to have all logic in one place] [grant.likely: Add error checking for unallocated irq_descs at associate time] Signed-off-by: Grant Likely <grant.likely@secretlab.ca> Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: Rob Herring <rob.herring@calxeda.com>
2012-06-17 22:17:04 +00:00
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);
irqdomain: Support for static IRQ mapping and association. This adds a new strict mapping API for supporting creation of linux IRQs at existing positions within the domain. The new routines are as follows: For dynamic allocation and insertion to specified ranges: - irq_create_identity_mapping() - irq_create_strict_mappings() These will allocate and associate a range of linux IRQs at the specified location. This can be used by controllers that have their own static linux IRQ definitions to map a hwirq range to, as well as for platforms that wish to establish 1:1 identity mapping between linux and hwirq space. For insertion to specified ranges by platforms that do their own irq_desc management: - irq_domain_associate() - irq_domain_associate_many() These in turn call back in to the domain's ->map() routine, for further processing by the platform. Disassociation of IRQs get handled through irq_dispose_mapping() as normal. With these in place it should be possible to begin migration of legacy IRQ domains to linear ones, without requiring special handling for static vs dynamic IRQ definitions in DT vs non-DT paths. This also makes it possible for domains with static mappings to adopt whichever tree model best fits their needs, rather than simply restricting them to linear revmaps. Signed-off-by: Paul Mundt <lethal@linux-sh.org> [grant.likely: Reorganized irq_domain_associate{,_many} to have all logic in one place] [grant.likely: Add error checking for unallocated irq_descs at associate time] Signed-off-by: Grant Likely <grant.likely@secretlab.ca> Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: Rob Herring <rob.herring@calxeda.com>
2012-06-17 22:17:04 +00:00
/**
* 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