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