genirq/irq_sim: Simplify the API

The interrupt simulator API exposes a lot of custom data structures and
functions and doesn't reuse the interfaces already exposed by the irq
subsystem. This patch tries to address it.

We hide all the simulator-related data structures from users and instead
rely on the well-known irq domain. When creating the interrupt simulator
the user receives a pointer to a newly created irq_domain and can use it
to create mappings for simulated interrupts.

It is also possible to pass a handle to fwnode when creating the simulator
domain and retrieve it using irq_find_matching_fwnode().

The irq_sim_fire() function is dropped as well. Instead we implement the
irq_get/set_irqchip_state interface.

We modify the two modules that use the simulator at the same time as
adding these changes in order to reduce the intermediate bloat that would
result when trying to migrate the drivers in separate patches.

Signed-off-by: Bartosz Golaszewski <bgolaszewski@baylibre.com>
Signed-off-by: Marc Zyngier <maz@kernel.org>
Reviewed-by: Linus Walleij <linus.walleij@linaro.org>
Acked-by: Jonathan Cameron <Jonathan.Cameron@huawei.com> #for IIO
Link: https://lore.kernel.org/r/20200514083901.23445-3-brgl@bgdev.pl

1 files changed, 9 insertions, 24 deletions

diff --git a/include/linux/irq_sim.h b/include/linux/irq_sim.h
index 4500d453a63e..ab831e5ae748 100644
--- a/include/linux/irq_sim.h
+++ b/include/linux/irq_sim.h
@@ -1,41 +1,26 @@
 /* SPDX-License-Identifier: GPL-2.0+ */
 /*
  * Copyright (C) 2017-2018 Bartosz Golaszewski <brgl@bgdev.pl>
+ * Copyright (C) 2020 Bartosz Golaszewski <bgolaszewski@baylibre.com>
  */
 
 #ifndef _LINUX_IRQ_SIM_H
 #define _LINUX_IRQ_SIM_H
 
-#include <linux/irq_work.h>
 #include <linux/device.h>
+#include <linux/fwnode.h>
+#include <linux/irqdomain.h>
 
 /*
  * Provides a framework for allocating simulated interrupts which can be
  * requested like normal irqs and enqueued from process context.
  */
 
-struct irq_sim_work_ctx {
-	struct irq_work		work;
-	unsigned long		*pending;
-};
-
-struct irq_sim_irq_ctx {
-	int			irqnum;
-	bool			enabled;
-};
-
-struct irq_sim {
-	struct irq_sim_work_ctx	work_ctx;
-	int			irq_base;
-	unsigned int		irq_count;
-	struct irq_sim_irq_ctx	*irqs;
-};
-
-int irq_sim_init(struct irq_sim *sim, unsigned int num_irqs);
-int devm_irq_sim_init(struct device *dev, struct irq_sim *sim,
-		      unsigned int num_irqs);
-void irq_sim_fini(struct irq_sim *sim);
-void irq_sim_fire(struct irq_sim *sim, unsigned int offset);
-int irq_sim_irqnum(struct irq_sim *sim, unsigned int offset);
+struct irq_domain *irq_domain_create_sim(struct fwnode_handle *fwnode,
+					 unsigned int num_irqs);
+struct irq_domain *devm_irq_domain_create_sim(struct device *dev,
+					      struct fwnode_handle *fwnode,
+					      unsigned int num_irqs);
+void irq_domain_remove_sim(struct irq_domain *domain);
 
 #endif /* _LINUX_IRQ_SIM_H */