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https://github.com/AuxXxilium/linux_dsm_epyc7002.git
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6d274309d0
Interrupt controllers can have non-zero starting value for h/w irq numbers. Adding support in irq_domain allows the domain hwirq numbering to match the interrupt controllers' numbering. As this makes looping over irqs for a domain more complicated, add loop iterators to iterate over all hwirqs and irqs for a domain. Signed-off-by: Rob Herring <rob.herring@calxeda.com> Reviewed-by: Jamie Iles <jamie@jamieiles.com> Tested-by: Thomas Abraham <thomas.abraham@linaro.org> Acked-by: Grant Likely <grant.likely@secretlab.ca> Acked-by: Thomas Gleixner <tglx@linutronix.de>
185 lines
4.9 KiB
C
185 lines
4.9 KiB
C
#include <linux/irq.h>
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#include <linux/irqdomain.h>
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#include <linux/module.h>
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#include <linux/mutex.h>
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#include <linux/of.h>
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#include <linux/of_address.h>
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#include <linux/slab.h>
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static LIST_HEAD(irq_domain_list);
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static DEFINE_MUTEX(irq_domain_mutex);
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/**
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* irq_domain_add() - Register an irq_domain
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* @domain: ptr to initialized irq_domain structure
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*
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* Registers an irq_domain structure. The irq_domain must at a minimum be
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* initialized with an ops structure pointer, and either a ->to_irq hook or
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* a valid irq_base value. Everything else is optional.
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*/
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void irq_domain_add(struct irq_domain *domain)
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{
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struct irq_data *d;
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int hwirq, irq;
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/*
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* This assumes that the irq_domain owner has already allocated
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* the irq_descs. This block will be removed when support for dynamic
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* allocation of irq_descs is added to irq_domain.
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*/
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irq_domain_for_each_irq(domain, hwirq, irq) {
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d = irq_get_irq_data(irq);
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if (!d) {
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WARN(1, "error: assigning domain to non existant irq_desc");
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return;
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}
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if (d->domain) {
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/* things are broken; just report, don't clean up */
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WARN(1, "error: irq_desc already assigned to a domain");
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return;
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}
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d->domain = domain;
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d->hwirq = hwirq;
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}
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mutex_lock(&irq_domain_mutex);
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list_add(&domain->list, &irq_domain_list);
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mutex_unlock(&irq_domain_mutex);
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}
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/**
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* irq_domain_del() - Unregister an irq_domain
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* @domain: ptr to registered irq_domain.
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*/
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void irq_domain_del(struct irq_domain *domain)
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{
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struct irq_data *d;
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int hwirq, irq;
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mutex_lock(&irq_domain_mutex);
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list_del(&domain->list);
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mutex_unlock(&irq_domain_mutex);
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/* Clear the irq_domain assignments */
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irq_domain_for_each_irq(domain, hwirq, irq) {
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d = irq_get_irq_data(irq);
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d->domain = NULL;
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}
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}
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#if defined(CONFIG_OF_IRQ)
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/**
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* irq_create_of_mapping() - Map a linux irq number from a DT interrupt spec
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*
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* Used by the device tree interrupt mapping code to translate a device tree
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* interrupt specifier to a valid linux irq number. Returns either a valid
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* linux IRQ number or 0.
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*
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* When the caller no longer need the irq number returned by this function it
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* should arrange to call irq_dispose_mapping().
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*/
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unsigned int irq_create_of_mapping(struct device_node *controller,
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const u32 *intspec, unsigned int intsize)
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{
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struct irq_domain *domain;
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unsigned long hwirq;
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unsigned int irq, type;
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int rc = -EINVAL;
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/* Find a domain which can translate the irq spec */
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mutex_lock(&irq_domain_mutex);
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list_for_each_entry(domain, &irq_domain_list, list) {
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if (!domain->ops->dt_translate)
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continue;
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rc = domain->ops->dt_translate(domain, controller,
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intspec, intsize, &hwirq, &type);
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if (rc == 0)
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break;
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}
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mutex_unlock(&irq_domain_mutex);
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if (rc != 0)
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return 0;
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irq = irq_domain_to_irq(domain, hwirq);
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if (type != IRQ_TYPE_NONE)
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irq_set_irq_type(irq, type);
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pr_debug("%s: mapped hwirq=%i to irq=%i, flags=%x\n",
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controller->full_name, (int)hwirq, irq, type);
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return irq;
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}
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EXPORT_SYMBOL_GPL(irq_create_of_mapping);
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/**
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* irq_dispose_mapping() - Discard a mapping created by irq_create_of_mapping()
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* @irq: linux irq number to be discarded
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*
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* Calling this function indicates the caller no longer needs a reference to
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* the linux irq number returned by a prior call to irq_create_of_mapping().
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*/
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void irq_dispose_mapping(unsigned int irq)
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{
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/*
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* nothing yet; will be filled when support for dynamic allocation of
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* irq_descs is added to irq_domain
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*/
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}
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EXPORT_SYMBOL_GPL(irq_dispose_mapping);
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int irq_domain_simple_dt_translate(struct irq_domain *d,
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struct device_node *controller,
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const u32 *intspec, unsigned int intsize,
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unsigned long *out_hwirq, unsigned int *out_type)
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{
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if (d->of_node != controller)
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return -EINVAL;
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if (intsize < 1)
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return -EINVAL;
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*out_hwirq = intspec[0];
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*out_type = IRQ_TYPE_NONE;
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if (intsize > 1)
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*out_type = intspec[1] & IRQ_TYPE_SENSE_MASK;
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return 0;
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}
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struct irq_domain_ops irq_domain_simple_ops = {
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.dt_translate = irq_domain_simple_dt_translate,
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};
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EXPORT_SYMBOL_GPL(irq_domain_simple_ops);
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/**
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* irq_domain_create_simple() - Set up a 'simple' translation range
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*/
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void irq_domain_add_simple(struct device_node *controller, int irq_base)
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{
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struct irq_domain *domain;
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domain = kzalloc(sizeof(*domain), GFP_KERNEL);
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if (!domain) {
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WARN_ON(1);
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return;
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}
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domain->irq_base = irq_base;
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domain->of_node = of_node_get(controller);
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domain->ops = &irq_domain_simple_ops;
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irq_domain_add(domain);
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}
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EXPORT_SYMBOL_GPL(irq_domain_add_simple);
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void irq_domain_generate_simple(const struct of_device_id *match,
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u64 phys_base, unsigned int irq_start)
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{
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struct device_node *node;
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pr_info("looking for phys_base=%llx, irq_start=%i\n",
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(unsigned long long) phys_base, (int) irq_start);
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node = of_find_matching_node_by_address(NULL, match, phys_base);
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if (node)
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irq_domain_add_simple(node, irq_start);
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else
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pr_info("no node found\n");
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}
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EXPORT_SYMBOL_GPL(irq_domain_generate_simple);
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#endif /* CONFIG_OF_IRQ */
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