[T106][ZXW-22]7520V3SCV2.01.01.02P42U09_VEC_V0.8_AP_VEC origin source commit
Change-Id: Ic6e05d89ecd62fc34f82b23dcf306c93764aec4b
diff --git a/ap/os/linux/linux-3.4.x/kernel/irq/irqdomain.c b/ap/os/linux/linux-3.4.x/kernel/irq/irqdomain.c
new file mode 100644
index 0000000..0e0ba5f
--- /dev/null
+++ b/ap/os/linux/linux-3.4.x/kernel/irq/irqdomain.c
@@ -0,0 +1,780 @@
+#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/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(sizeof(*domain), GFP_KERNEL);
+ 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_add(struct irq_domain *domain)
+{
+ mutex_lock(&irq_domain_mutex);
+ list_add(&domain->link, &irq_domain_list);
+ mutex_unlock(&irq_domain_mutex);
+ pr_debug("irq: Allocated domain of type %d @0x%p\n",
+ domain->revmap_type, domain);
+}
+
+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_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);
+ of_node_put(domain->of_node);
+ kfree(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
+ */
+ ops->map(domain, irq, hwirq);
+
+ /* Clear norequest flags */
+ irq_clear_status_flags(irq, IRQ_NOREQUEST);
+ }
+
+ irq_domain_add(domain);
+ return domain;
+}
+
+/**
+ * irq_domain_add_linear() - Allocate and register a legacy revmap irq_domain.
+ * @of_node: pointer to interrupt controller's device tree node.
+ * @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(sizeof(*revmap) * size, GFP_KERNEL);
+ 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;
+}
+
+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;
+}
+
+/**
+ * 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;
+}
+
+/**
+ * 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("irq: Default domain set to @0x%p\n", domain);
+
+ irq_default_domain = domain;
+}
+
+static int irq_setup_virq(struct irq_domain *domain, unsigned int virq,
+ irq_hw_number_t hwirq)
+{
+ struct irq_data *irq_data = irq_get_irq_data(virq);
+
+ irq_data->hwirq = hwirq;
+ irq_data->domain = domain;
+ if (domain->ops->map(domain, virq, hwirq)) {
+ pr_debug("irq: -> mapping failed, freeing\n");
+ irq_data->domain = NULL;
+ irq_data->hwirq = 0;
+ return -1;
+ }
+
+ irq_clear_status_flags(virq, IRQ_NOREQUEST);
+
+ return 0;
+}
+
+/**
+ * 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;
+
+ BUG_ON(domain == NULL);
+ WARN_ON(domain->revmap_type != IRQ_DOMAIN_MAP_NOMAP);
+
+ virq = irq_alloc_desc_from(1, 0);
+ if (!virq) {
+ pr_debug("irq: 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("irq: create_direct obtained virq %d\n", virq);
+
+ if (irq_setup_virq(domain, virq, virq)) {
+ irq_free_desc(virq);
+ return 0;
+ }
+
+ return virq;
+}
+
+/**
+ * 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: 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) {
+ printk(KERN_WARNING "irq_create_mapping called for"
+ " NULL domain, hwirq=%lx\n", hwirq);
+ WARN_ON(1);
+ return 0;
+ }
+ pr_debug("irq: -> using domain @%p\n", domain);
+
+ /* Check if mapping already exists */
+ virq = irq_find_mapping(domain, hwirq);
+ if (virq) {
+ pr_debug("irq: -> 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, 0);
+ if (virq <= 0)
+ virq = irq_alloc_desc_from(1, 0);
+ if (virq <= 0) {
+ pr_debug("irq: -> virq allocation failed\n");
+ return 0;
+ }
+
+ if (irq_setup_virq(domain, virq, hwirq)) {
+ if (domain->revmap_type != IRQ_DOMAIN_MAP_LEGACY)
+ irq_free_desc(virq);
+ return 0;
+ }
+
+ pr_debug("irq: irq %lu on domain %s mapped to virtual irq %u\n",
+ hwirq, domain->of_node ? domain->of_node->full_name : "null", virq);
+
+ return virq;
+}
+EXPORT_SYMBOL_GPL(irq_create_mapping);
+
+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
+ printk(KERN_WARNING "irq: no irq domain found for %s !\n",
+ controller->full_name);
+ 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;
+ irq_hw_number_t hwirq;
+
+ 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_set_status_flags(virq, IRQ_NOREQUEST);
+
+ /* remove chip and handler */
+ irq_set_chip_and_handler(virq, NULL, NULL);
+
+ /* Make sure it's completed */
+ synchronize_irq(virq);
+
+ /* Tell the PIC about it */
+ if (domain->ops->unmap)
+ domain->ops->unmap(domain, virq);
+ smp_mb();
+
+ /* Clear reverse map */
+ hwirq = irq_data->hwirq;
+ 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;
+ }
+
+ 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
+ *
+ * This is a slow path, for use by generic code. It's expected that an
+ * irq controller implementation directly calls the appropriate low level
+ * mapping function.
+ */
+unsigned int irq_find_mapping(struct irq_domain *domain,
+ irq_hw_number_t hwirq)
+{
+ unsigned int i;
+ unsigned int hint = hwirq % nr_irqs;
+
+ /* Look for default domain if nececssary */
+ if (domain == NULL)
+ domain = irq_default_domain;
+ if (domain == NULL)
+ return 0;
+
+ /* legacy -> bail early */
+ if (domain->revmap_type == IRQ_DOMAIN_MAP_LEGACY)
+ return irq_domain_legacy_revmap(domain, hwirq);
+
+ /* Slow path does a linear search of the map */
+ if (hint == 0)
+ hint = 1;
+ i = hint;
+ do {
+ struct irq_data *data = irq_get_irq_data(i);
+ if (data && (data->domain == domain) && (data->hwirq == hwirq))
+ return i;
+ i++;
+ if (i >= nr_irqs)
+ i = 1;
+ } while(i != hint);
+ return 0;
+}
+EXPORT_SYMBOL_GPL(irq_find_mapping);
+
+/**
+ * irq_radix_revmap_lookup() - 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, for use by irq controller code that uses radix tree
+ * revmaps
+ */
+unsigned int irq_radix_revmap_lookup(struct irq_domain *domain,
+ irq_hw_number_t hwirq)
+{
+ struct irq_data *irq_data;
+
+ if (WARN_ON_ONCE(domain->revmap_type != IRQ_DOMAIN_MAP_TREE))
+ return irq_find_mapping(domain, hwirq);
+
+ /*
+ * Freeing an irq can delete nodes along the path to
+ * do the lookup via call_rcu.
+ */
+ rcu_read_lock();
+ irq_data = radix_tree_lookup(&domain->revmap_data.tree, hwirq);
+ rcu_read_unlock();
+
+ /*
+ * If found in radix tree, then fine.
+ * Else fallback to linear lookup - this should not happen in practice
+ * as it means that we failed to insert the node in the radix tree.
+ */
+ return irq_data ? irq_data->irq : irq_find_mapping(domain, hwirq);
+}
+
+/**
+ * irq_radix_revmap_insert() - Insert a hw irq to linux irq number mapping.
+ * @domain: domain owning this hardware interrupt
+ * @virq: linux irq number
+ * @hwirq: hardware irq number in that domain space
+ *
+ * This is for use by irq controllers that use a radix tree reverse
+ * mapping for fast lookup.
+ */
+void irq_radix_revmap_insert(struct irq_domain *domain, unsigned int virq,
+ irq_hw_number_t hwirq)
+{
+ struct irq_data *irq_data = irq_get_irq_data(virq);
+
+ if (WARN_ON(domain->revmap_type != IRQ_DOMAIN_MAP_TREE))
+ return;
+
+ if (virq) {
+ mutex_lock(&revmap_trees_mutex);
+ radix_tree_insert(&domain->revmap_data.tree, hwirq, irq_data);
+ mutex_unlock(&revmap_trees_mutex);
+ }
+}
+
+/**
+ * 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, for use by irq controller code that uses linear
+ * revmaps. It does fallback to the slow path if the revmap doesn't exist
+ * yet and will create the revmap entry with appropriate locking
+ */
+unsigned int irq_linear_revmap(struct irq_domain *domain,
+ irq_hw_number_t hwirq)
+{
+ unsigned int *revmap;
+
+ if (WARN_ON_ONCE(domain->revmap_type != IRQ_DOMAIN_MAP_LINEAR))
+ return irq_find_mapping(domain, hwirq);
+
+ /* Check revmap bounds */
+ if (unlikely(hwirq >= domain->revmap_data.linear.size))
+ return irq_find_mapping(domain, hwirq);
+
+ /* Check if revmap was allocated */
+ revmap = domain->revmap_data.linear.revmap;
+ if (unlikely(revmap == NULL))
+ return irq_find_mapping(domain, hwirq);
+
+ /* Fill up revmap with slow path if no mapping found */
+ if (unlikely(!revmap[hwirq]))
+ revmap[hwirq] = irq_find_mapping(domain, hwirq);
+
+ return revmap[hwirq];
+}
+
+#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 && desc->irq_data.domain->of_node)
+ p = desc->irq_data.domain->of_node->full_name;
+ 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 */
+
+int irq_domain_simple_map(struct irq_domain *d, unsigned int irq,
+ irq_hw_number_t hwirq)
+{
+ return 0;
+}
+
+/**
+ * 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 = {
+ .map = irq_domain_simple_map,
+ .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