// SPDX-License-Identifier: GPL-2.0+
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/*
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* Copyright (C) 2017-2018 Bartosz Golaszewski <brgl@bgdev.pl>
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* Copyright (C) 2020 Bartosz Golaszewski <bgolaszewski@baylibre.com>
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*/
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#include <linux/irq.h>
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#include <linux/irq_sim.h>
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#include <linux/irq_work.h>
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#include <linux/interrupt.h>
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#include <linux/slab.h>
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struct irq_sim_work_ctx {
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struct irq_work work;
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int irq_base;
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unsigned int irq_count;
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unsigned long *pending;
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struct irq_domain *domain;
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};
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struct irq_sim_irq_ctx {
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int irqnum;
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bool enabled;
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struct irq_sim_work_ctx *work_ctx;
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};
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struct irq_sim_devres {
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struct irq_domain *domain;
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};
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static void irq_sim_irqmask(struct irq_data *data)
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{
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struct irq_sim_irq_ctx *irq_ctx = irq_data_get_irq_chip_data(data);
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irq_ctx->enabled = false;
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}
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static void irq_sim_irqunmask(struct irq_data *data)
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{
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struct irq_sim_irq_ctx *irq_ctx = irq_data_get_irq_chip_data(data);
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irq_ctx->enabled = true;
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}
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static int irq_sim_set_type(struct irq_data *data, unsigned int type)
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{
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/* We only support rising and falling edge trigger types. */
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if (type & ~IRQ_TYPE_EDGE_BOTH)
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return -EINVAL;
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irqd_set_trigger_type(data, type);
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return 0;
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}
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static int irq_sim_get_irqchip_state(struct irq_data *data,
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enum irqchip_irq_state which, bool *state)
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{
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struct irq_sim_irq_ctx *irq_ctx = irq_data_get_irq_chip_data(data);
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irq_hw_number_t hwirq = irqd_to_hwirq(data);
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switch (which) {
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case IRQCHIP_STATE_PENDING:
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if (irq_ctx->enabled)
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*state = test_bit(hwirq, irq_ctx->work_ctx->pending);
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break;
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default:
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return -EINVAL;
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}
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return 0;
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}
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static int irq_sim_set_irqchip_state(struct irq_data *data,
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enum irqchip_irq_state which, bool state)
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{
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struct irq_sim_irq_ctx *irq_ctx = irq_data_get_irq_chip_data(data);
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irq_hw_number_t hwirq = irqd_to_hwirq(data);
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switch (which) {
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case IRQCHIP_STATE_PENDING:
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if (irq_ctx->enabled) {
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assign_bit(hwirq, irq_ctx->work_ctx->pending, state);
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if (state)
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irq_work_queue(&irq_ctx->work_ctx->work);
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}
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break;
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default:
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return -EINVAL;
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}
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return 0;
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}
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static struct irq_chip irq_sim_irqchip = {
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.name = "irq_sim",
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.irq_mask = irq_sim_irqmask,
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.irq_unmask = irq_sim_irqunmask,
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.irq_set_type = irq_sim_set_type,
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.irq_get_irqchip_state = irq_sim_get_irqchip_state,
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.irq_set_irqchip_state = irq_sim_set_irqchip_state,
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};
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static void irq_sim_handle_irq(struct irq_work *work)
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{
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struct irq_sim_work_ctx *work_ctx;
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unsigned int offset = 0;
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int irqnum;
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work_ctx = container_of(work, struct irq_sim_work_ctx, work);
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while (!bitmap_empty(work_ctx->pending, work_ctx->irq_count)) {
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offset = find_next_bit(work_ctx->pending,
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work_ctx->irq_count, offset);
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clear_bit(offset, work_ctx->pending);
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irqnum = irq_find_mapping(work_ctx->domain, offset);
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handle_simple_irq(irq_to_desc(irqnum));
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}
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}
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static int irq_sim_domain_map(struct irq_domain *domain,
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unsigned int virq, irq_hw_number_t hw)
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{
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struct irq_sim_work_ctx *work_ctx = domain->host_data;
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struct irq_sim_irq_ctx *irq_ctx;
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irq_ctx = kzalloc(sizeof(*irq_ctx), GFP_KERNEL);
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if (!irq_ctx)
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return -ENOMEM;
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irq_set_chip(virq, &irq_sim_irqchip);
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irq_set_chip_data(virq, irq_ctx);
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irq_set_handler(virq, handle_simple_irq);
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irq_modify_status(virq, IRQ_NOREQUEST | IRQ_NOAUTOEN, IRQ_NOPROBE);
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irq_ctx->work_ctx = work_ctx;
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return 0;
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}
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static void irq_sim_domain_unmap(struct irq_domain *domain, unsigned int virq)
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{
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struct irq_sim_irq_ctx *irq_ctx;
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struct irq_data *irqd;
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irqd = irq_domain_get_irq_data(domain, virq);
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irq_ctx = irq_data_get_irq_chip_data(irqd);
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irq_set_handler(virq, NULL);
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irq_domain_reset_irq_data(irqd);
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kfree(irq_ctx);
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}
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static const struct irq_domain_ops irq_sim_domain_ops = {
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.map = irq_sim_domain_map,
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.unmap = irq_sim_domain_unmap,
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};
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/**
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* irq_domain_create_sim - Create a new interrupt simulator irq_domain and
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* allocate a range of dummy interrupts.
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*
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* @fnode: struct fwnode_handle to be associated with this domain.
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* @num_irqs: Number of interrupts to allocate.
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*
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* On success: return a new irq_domain object.
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* On failure: a negative errno wrapped with ERR_PTR().
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*/
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struct irq_domain *irq_domain_create_sim(struct fwnode_handle *fwnode,
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unsigned int num_irqs)
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{
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struct irq_sim_work_ctx *work_ctx;
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work_ctx = kmalloc(sizeof(*work_ctx), GFP_KERNEL);
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if (!work_ctx)
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goto err_out;
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work_ctx->pending = bitmap_zalloc(num_irqs, GFP_KERNEL);
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if (!work_ctx->pending)
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goto err_free_work_ctx;
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work_ctx->domain = irq_domain_create_linear(fwnode, num_irqs,
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&irq_sim_domain_ops,
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work_ctx);
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if (!work_ctx->domain)
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goto err_free_bitmap;
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work_ctx->irq_count = num_irqs;
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init_irq_work(&work_ctx->work, irq_sim_handle_irq);
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return work_ctx->domain;
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err_free_bitmap:
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bitmap_free(work_ctx->pending);
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err_free_work_ctx:
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kfree(work_ctx);
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err_out:
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return ERR_PTR(-ENOMEM);
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}
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EXPORT_SYMBOL_GPL(irq_domain_create_sim);
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/**
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* irq_domain_remove_sim - Deinitialize the interrupt simulator domain: free
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* the interrupt descriptors and allocated memory.
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*
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* @domain: The interrupt simulator domain to tear down.
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*/
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void irq_domain_remove_sim(struct irq_domain *domain)
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{
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struct irq_sim_work_ctx *work_ctx = domain->host_data;
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irq_work_sync(&work_ctx->work);
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bitmap_free(work_ctx->pending);
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kfree(work_ctx);
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irq_domain_remove(domain);
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}
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EXPORT_SYMBOL_GPL(irq_domain_remove_sim);
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static void devm_irq_domain_release_sim(struct device *dev, void *res)
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{
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struct irq_sim_devres *this = res;
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irq_domain_remove_sim(this->domain);
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}
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/**
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* devm_irq_domain_create_sim - Create a new interrupt simulator for
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* a managed device.
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*
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* @dev: Device to initialize the simulator object for.
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* @fnode: struct fwnode_handle to be associated with this domain.
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* @num_irqs: Number of interrupts to allocate
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*
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* On success: return a new irq_domain object.
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* On failure: a negative errno wrapped with ERR_PTR().
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*/
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struct irq_domain *devm_irq_domain_create_sim(struct device *dev,
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struct fwnode_handle *fwnode,
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unsigned int num_irqs)
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{
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struct irq_sim_devres *dr;
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dr = devres_alloc(devm_irq_domain_release_sim,
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sizeof(*dr), GFP_KERNEL);
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if (!dr)
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return ERR_PTR(-ENOMEM);
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dr->domain = irq_domain_create_sim(fwnode, num_irqs);
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if (IS_ERR(dr->domain)) {
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devres_free(dr);
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return dr->domain;
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}
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devres_add(dev, dr);
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return dr->domain;
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}
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EXPORT_SYMBOL_GPL(devm_irq_domain_create_sim);
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