mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-08-23 09:19:51 +00:00
![Bartosz Golaszewski](/assets/img/avatar_default.png)
Implement the irq_set_type() callback and call irqd_set_trigger_type() internally so that users interested in the configured trigger type can later retrieve it using irqd_get_trigger_type(). We only support edge trigger types. Signed-off-by: Bartosz Golaszewski <bgolaszewski@baylibre.com> Acked-by: Marc Zyngier <marc.zyngier@arm.com>
194 lines
4.8 KiB
C
194 lines
4.8 KiB
C
// SPDX-License-Identifier: GPL-2.0+
|
|
/*
|
|
* Copyright (C) 2017-2018 Bartosz Golaszewski <brgl@bgdev.pl>
|
|
*/
|
|
|
|
#include <linux/slab.h>
|
|
#include <linux/irq_sim.h>
|
|
#include <linux/irq.h>
|
|
|
|
struct irq_sim_devres {
|
|
struct irq_sim *sim;
|
|
};
|
|
|
|
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 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,
|
|
};
|
|
|
|
static void irq_sim_handle_irq(struct irq_work *work)
|
|
{
|
|
struct irq_sim_work_ctx *work_ctx;
|
|
unsigned int offset = 0;
|
|
struct irq_sim *sim;
|
|
int irqnum;
|
|
|
|
work_ctx = container_of(work, struct irq_sim_work_ctx, work);
|
|
sim = container_of(work_ctx, struct irq_sim, work_ctx);
|
|
|
|
while (!bitmap_empty(work_ctx->pending, sim->irq_count)) {
|
|
offset = find_next_bit(work_ctx->pending,
|
|
sim->irq_count, offset);
|
|
clear_bit(offset, work_ctx->pending);
|
|
irqnum = irq_sim_irqnum(sim, offset);
|
|
handle_simple_irq(irq_to_desc(irqnum));
|
|
}
|
|
}
|
|
|
|
/**
|
|
* irq_sim_init - Initialize the interrupt simulator: allocate a range of
|
|
* dummy interrupts.
|
|
*
|
|
* @sim: The interrupt simulator object to initialize.
|
|
* @num_irqs: Number of interrupts to allocate
|
|
*
|
|
* On success: return the base of the allocated interrupt range.
|
|
* On failure: a negative errno.
|
|
*/
|
|
int irq_sim_init(struct irq_sim *sim, unsigned int num_irqs)
|
|
{
|
|
int i;
|
|
|
|
sim->irqs = kmalloc_array(num_irqs, sizeof(*sim->irqs), GFP_KERNEL);
|
|
if (!sim->irqs)
|
|
return -ENOMEM;
|
|
|
|
sim->irq_base = irq_alloc_descs(-1, 0, num_irqs, 0);
|
|
if (sim->irq_base < 0) {
|
|
kfree(sim->irqs);
|
|
return sim->irq_base;
|
|
}
|
|
|
|
sim->work_ctx.pending = bitmap_zalloc(num_irqs, GFP_KERNEL);
|
|
if (!sim->work_ctx.pending) {
|
|
kfree(sim->irqs);
|
|
irq_free_descs(sim->irq_base, num_irqs);
|
|
return -ENOMEM;
|
|
}
|
|
|
|
for (i = 0; i < num_irqs; i++) {
|
|
sim->irqs[i].irqnum = sim->irq_base + i;
|
|
sim->irqs[i].enabled = false;
|
|
irq_set_chip(sim->irq_base + i, &irq_sim_irqchip);
|
|
irq_set_chip_data(sim->irq_base + i, &sim->irqs[i]);
|
|
irq_set_handler(sim->irq_base + i, &handle_simple_irq);
|
|
irq_modify_status(sim->irq_base + i,
|
|
IRQ_NOREQUEST | IRQ_NOAUTOEN, IRQ_NOPROBE);
|
|
}
|
|
|
|
init_irq_work(&sim->work_ctx.work, irq_sim_handle_irq);
|
|
sim->irq_count = num_irqs;
|
|
|
|
return sim->irq_base;
|
|
}
|
|
EXPORT_SYMBOL_GPL(irq_sim_init);
|
|
|
|
/**
|
|
* irq_sim_fini - Deinitialize the interrupt simulator: free the interrupt
|
|
* descriptors and allocated memory.
|
|
*
|
|
* @sim: The interrupt simulator to tear down.
|
|
*/
|
|
void irq_sim_fini(struct irq_sim *sim)
|
|
{
|
|
irq_work_sync(&sim->work_ctx.work);
|
|
bitmap_free(sim->work_ctx.pending);
|
|
irq_free_descs(sim->irq_base, sim->irq_count);
|
|
kfree(sim->irqs);
|
|
}
|
|
EXPORT_SYMBOL_GPL(irq_sim_fini);
|
|
|
|
static void devm_irq_sim_release(struct device *dev, void *res)
|
|
{
|
|
struct irq_sim_devres *this = res;
|
|
|
|
irq_sim_fini(this->sim);
|
|
}
|
|
|
|
/**
|
|
* irq_sim_init - Initialize the interrupt simulator for a managed device.
|
|
*
|
|
* @dev: Device to initialize the simulator object for.
|
|
* @sim: The interrupt simulator object to initialize.
|
|
* @num_irqs: Number of interrupts to allocate
|
|
*
|
|
* On success: return the base of the allocated interrupt range.
|
|
* On failure: a negative errno.
|
|
*/
|
|
int devm_irq_sim_init(struct device *dev, struct irq_sim *sim,
|
|
unsigned int num_irqs)
|
|
{
|
|
struct irq_sim_devres *dr;
|
|
int rv;
|
|
|
|
dr = devres_alloc(devm_irq_sim_release, sizeof(*dr), GFP_KERNEL);
|
|
if (!dr)
|
|
return -ENOMEM;
|
|
|
|
rv = irq_sim_init(sim, num_irqs);
|
|
if (rv < 0) {
|
|
devres_free(dr);
|
|
return rv;
|
|
}
|
|
|
|
dr->sim = sim;
|
|
devres_add(dev, dr);
|
|
|
|
return rv;
|
|
}
|
|
EXPORT_SYMBOL_GPL(devm_irq_sim_init);
|
|
|
|
/**
|
|
* irq_sim_fire - Enqueue an interrupt.
|
|
*
|
|
* @sim: The interrupt simulator object.
|
|
* @offset: Offset of the simulated interrupt which should be fired.
|
|
*/
|
|
void irq_sim_fire(struct irq_sim *sim, unsigned int offset)
|
|
{
|
|
if (sim->irqs[offset].enabled) {
|
|
set_bit(offset, sim->work_ctx.pending);
|
|
irq_work_queue(&sim->work_ctx.work);
|
|
}
|
|
}
|
|
EXPORT_SYMBOL_GPL(irq_sim_fire);
|
|
|
|
/**
|
|
* irq_sim_irqnum - Get the allocated number of a dummy interrupt.
|
|
*
|
|
* @sim: The interrupt simulator object.
|
|
* @offset: Offset of the simulated interrupt for which to retrieve
|
|
* the number.
|
|
*/
|
|
int irq_sim_irqnum(struct irq_sim *sim, unsigned int offset)
|
|
{
|
|
return sim->irqs[offset].irqnum;
|
|
}
|
|
EXPORT_SYMBOL_GPL(irq_sim_irqnum);
|