ASR_BASE
Change-Id: Icf3719cc0afe3eeb3edc7fa80a2eb5199ca9dda1
diff --git a/marvell/linux/kernel/irq/irq_sim.c b/marvell/linux/kernel/irq/irq_sim.c
new file mode 100644
index 0000000..b992f88
--- /dev/null
+++ b/marvell/linux/kernel/irq/irq_sim.c
@@ -0,0 +1,194 @@
+// 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);