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1// SPDX-License-Identifier: GPL-2.0+
2/*
3 * Copyright (C) 2017-2018 Bartosz Golaszewski <brgl@bgdev.pl>
4 */
5
6#include <linux/slab.h>
7#include <linux/irq_sim.h>
8#include <linux/irq.h>
9
10struct irq_sim_devres {
11 struct irq_sim *sim;
12};
13
14static void irq_sim_irqmask(struct irq_data *data)
15{
16 struct irq_sim_irq_ctx *irq_ctx = irq_data_get_irq_chip_data(data);
17
18 irq_ctx->enabled = false;
19}
20
21static void irq_sim_irqunmask(struct irq_data *data)
22{
23 struct irq_sim_irq_ctx *irq_ctx = irq_data_get_irq_chip_data(data);
24
25 irq_ctx->enabled = true;
26}
27
28static int irq_sim_set_type(struct irq_data *data, unsigned int type)
29{
30 /* We only support rising and falling edge trigger types. */
31 if (type & ~IRQ_TYPE_EDGE_BOTH)
32 return -EINVAL;
33
34 irqd_set_trigger_type(data, type);
35
36 return 0;
37}
38
39static struct irq_chip irq_sim_irqchip = {
40 .name = "irq_sim",
41 .irq_mask = irq_sim_irqmask,
42 .irq_unmask = irq_sim_irqunmask,
43 .irq_set_type = irq_sim_set_type,
44};
45
46static void irq_sim_handle_irq(struct irq_work *work)
47{
48 struct irq_sim_work_ctx *work_ctx;
49 unsigned int offset = 0;
50 struct irq_sim *sim;
51 int irqnum;
52
53 work_ctx = container_of(work, struct irq_sim_work_ctx, work);
54 sim = container_of(work_ctx, struct irq_sim, work_ctx);
55
56 while (!bitmap_empty(work_ctx->pending, sim->irq_count)) {
57 offset = find_next_bit(work_ctx->pending,
58 sim->irq_count, offset);
59 clear_bit(offset, work_ctx->pending);
60 irqnum = irq_sim_irqnum(sim, offset);
61 handle_simple_irq(irq_to_desc(irqnum));
62 }
63}
64
65/**
66 * irq_sim_init - Initialize the interrupt simulator: allocate a range of
67 * dummy interrupts.
68 *
69 * @sim: The interrupt simulator object to initialize.
70 * @num_irqs: Number of interrupts to allocate
71 *
72 * On success: return the base of the allocated interrupt range.
73 * On failure: a negative errno.
74 */
75int irq_sim_init(struct irq_sim *sim, unsigned int num_irqs)
76{
77 int i;
78
79 sim->irqs = kmalloc_array(num_irqs, sizeof(*sim->irqs), GFP_KERNEL);
80 if (!sim->irqs)
81 return -ENOMEM;
82
83 sim->irq_base = irq_alloc_descs(-1, 0, num_irqs, 0);
84 if (sim->irq_base < 0) {
85 kfree(sim->irqs);
86 return sim->irq_base;
87 }
88
89 sim->work_ctx.pending = bitmap_zalloc(num_irqs, GFP_KERNEL);
90 if (!sim->work_ctx.pending) {
91 kfree(sim->irqs);
92 irq_free_descs(sim->irq_base, num_irqs);
93 return -ENOMEM;
94 }
95
96 for (i = 0; i < num_irqs; i++) {
97 sim->irqs[i].irqnum = sim->irq_base + i;
98 sim->irqs[i].enabled = false;
99 irq_set_chip(sim->irq_base + i, &irq_sim_irqchip);
100 irq_set_chip_data(sim->irq_base + i, &sim->irqs[i]);
101 irq_set_handler(sim->irq_base + i, &handle_simple_irq);
102 irq_modify_status(sim->irq_base + i,
103 IRQ_NOREQUEST | IRQ_NOAUTOEN, IRQ_NOPROBE);
104 }
105
106 init_irq_work(&sim->work_ctx.work, irq_sim_handle_irq);
107 sim->irq_count = num_irqs;
108
109 return sim->irq_base;
110}
111EXPORT_SYMBOL_GPL(irq_sim_init);
112
113/**
114 * irq_sim_fini - Deinitialize the interrupt simulator: free the interrupt
115 * descriptors and allocated memory.
116 *
117 * @sim: The interrupt simulator to tear down.
118 */
119void irq_sim_fini(struct irq_sim *sim)
120{
121 irq_work_sync(&sim->work_ctx.work);
122 bitmap_free(sim->work_ctx.pending);
123 irq_free_descs(sim->irq_base, sim->irq_count);
124 kfree(sim->irqs);
125}
126EXPORT_SYMBOL_GPL(irq_sim_fini);
127
128static void devm_irq_sim_release(struct device *dev, void *res)
129{
130 struct irq_sim_devres *this = res;
131
132 irq_sim_fini(this->sim);
133}
134
135/**
136 * irq_sim_init - Initialize the interrupt simulator for a managed device.
137 *
138 * @dev: Device to initialize the simulator object for.
139 * @sim: The interrupt simulator object to initialize.
140 * @num_irqs: Number of interrupts to allocate
141 *
142 * On success: return the base of the allocated interrupt range.
143 * On failure: a negative errno.
144 */
145int devm_irq_sim_init(struct device *dev, struct irq_sim *sim,
146 unsigned int num_irqs)
147{
148 struct irq_sim_devres *dr;
149 int rv;
150
151 dr = devres_alloc(devm_irq_sim_release, sizeof(*dr), GFP_KERNEL);
152 if (!dr)
153 return -ENOMEM;
154
155 rv = irq_sim_init(sim, num_irqs);
156 if (rv < 0) {
157 devres_free(dr);
158 return rv;
159 }
160
161 dr->sim = sim;
162 devres_add(dev, dr);
163
164 return rv;
165}
166EXPORT_SYMBOL_GPL(devm_irq_sim_init);
167
168/**
169 * irq_sim_fire - Enqueue an interrupt.
170 *
171 * @sim: The interrupt simulator object.
172 * @offset: Offset of the simulated interrupt which should be fired.
173 */
174void irq_sim_fire(struct irq_sim *sim, unsigned int offset)
175{
176 if (sim->irqs[offset].enabled) {
177 set_bit(offset, sim->work_ctx.pending);
178 irq_work_queue(&sim->work_ctx.work);
179 }
180}
181EXPORT_SYMBOL_GPL(irq_sim_fire);
182
183/**
184 * irq_sim_irqnum - Get the allocated number of a dummy interrupt.
185 *
186 * @sim: The interrupt simulator object.
187 * @offset: Offset of the simulated interrupt for which to retrieve
188 * the number.
189 */
190int irq_sim_irqnum(struct irq_sim *sim, unsigned int offset)
191{
192 return sim->irqs[offset].irqnum;
193}
194EXPORT_SYMBOL_GPL(irq_sim_irqnum);
1// SPDX-License-Identifier: GPL-2.0+
2/*
3 * Copyright (C) 2017 Bartosz Golaszewski <brgl@bgdev.pl>
4 *
5 * This program is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License as published by the
7 * Free Software Foundation; either version 2 of the License, or (at your
8 * option) any later version.
9 */
10
11#include <linux/slab.h>
12#include <linux/irq_sim.h>
13#include <linux/irq.h>
14
15struct irq_sim_devres {
16 struct irq_sim *sim;
17};
18
19static void irq_sim_irqmask(struct irq_data *data)
20{
21 struct irq_sim_irq_ctx *irq_ctx = irq_data_get_irq_chip_data(data);
22
23 irq_ctx->enabled = false;
24}
25
26static void irq_sim_irqunmask(struct irq_data *data)
27{
28 struct irq_sim_irq_ctx *irq_ctx = irq_data_get_irq_chip_data(data);
29
30 irq_ctx->enabled = true;
31}
32
33static struct irq_chip irq_sim_irqchip = {
34 .name = "irq_sim",
35 .irq_mask = irq_sim_irqmask,
36 .irq_unmask = irq_sim_irqunmask,
37};
38
39static void irq_sim_handle_irq(struct irq_work *work)
40{
41 struct irq_sim_work_ctx *work_ctx;
42
43 work_ctx = container_of(work, struct irq_sim_work_ctx, work);
44 handle_simple_irq(irq_to_desc(work_ctx->irq));
45}
46
47/**
48 * irq_sim_init - Initialize the interrupt simulator: allocate a range of
49 * dummy interrupts.
50 *
51 * @sim: The interrupt simulator object to initialize.
52 * @num_irqs: Number of interrupts to allocate
53 *
54 * On success: return the base of the allocated interrupt range.
55 * On failure: a negative errno.
56 */
57int irq_sim_init(struct irq_sim *sim, unsigned int num_irqs)
58{
59 int i;
60
61 sim->irqs = kmalloc_array(num_irqs, sizeof(*sim->irqs), GFP_KERNEL);
62 if (!sim->irqs)
63 return -ENOMEM;
64
65 sim->irq_base = irq_alloc_descs(-1, 0, num_irqs, 0);
66 if (sim->irq_base < 0) {
67 kfree(sim->irqs);
68 return sim->irq_base;
69 }
70
71 for (i = 0; i < num_irqs; i++) {
72 sim->irqs[i].irqnum = sim->irq_base + i;
73 sim->irqs[i].enabled = false;
74 irq_set_chip(sim->irq_base + i, &irq_sim_irqchip);
75 irq_set_chip_data(sim->irq_base + i, &sim->irqs[i]);
76 irq_set_handler(sim->irq_base + i, &handle_simple_irq);
77 irq_modify_status(sim->irq_base + i,
78 IRQ_NOREQUEST | IRQ_NOAUTOEN, IRQ_NOPROBE);
79 }
80
81 init_irq_work(&sim->work_ctx.work, irq_sim_handle_irq);
82 sim->irq_count = num_irqs;
83
84 return sim->irq_base;
85}
86EXPORT_SYMBOL_GPL(irq_sim_init);
87
88/**
89 * irq_sim_fini - Deinitialize the interrupt simulator: free the interrupt
90 * descriptors and allocated memory.
91 *
92 * @sim: The interrupt simulator to tear down.
93 */
94void irq_sim_fini(struct irq_sim *sim)
95{
96 irq_work_sync(&sim->work_ctx.work);
97 irq_free_descs(sim->irq_base, sim->irq_count);
98 kfree(sim->irqs);
99}
100EXPORT_SYMBOL_GPL(irq_sim_fini);
101
102static void devm_irq_sim_release(struct device *dev, void *res)
103{
104 struct irq_sim_devres *this = res;
105
106 irq_sim_fini(this->sim);
107}
108
109/**
110 * irq_sim_init - Initialize the interrupt simulator for a managed device.
111 *
112 * @dev: Device to initialize the simulator object for.
113 * @sim: The interrupt simulator object to initialize.
114 * @num_irqs: Number of interrupts to allocate
115 *
116 * On success: return the base of the allocated interrupt range.
117 * On failure: a negative errno.
118 */
119int devm_irq_sim_init(struct device *dev, struct irq_sim *sim,
120 unsigned int num_irqs)
121{
122 struct irq_sim_devres *dr;
123 int rv;
124
125 dr = devres_alloc(devm_irq_sim_release, sizeof(*dr), GFP_KERNEL);
126 if (!dr)
127 return -ENOMEM;
128
129 rv = irq_sim_init(sim, num_irqs);
130 if (rv < 0) {
131 devres_free(dr);
132 return rv;
133 }
134
135 dr->sim = sim;
136 devres_add(dev, dr);
137
138 return rv;
139}
140EXPORT_SYMBOL_GPL(devm_irq_sim_init);
141
142/**
143 * irq_sim_fire - Enqueue an interrupt.
144 *
145 * @sim: The interrupt simulator object.
146 * @offset: Offset of the simulated interrupt which should be fired.
147 */
148void irq_sim_fire(struct irq_sim *sim, unsigned int offset)
149{
150 if (sim->irqs[offset].enabled) {
151 sim->work_ctx.irq = irq_sim_irqnum(sim, offset);
152 irq_work_queue(&sim->work_ctx.work);
153 }
154}
155EXPORT_SYMBOL_GPL(irq_sim_fire);
156
157/**
158 * irq_sim_irqnum - Get the allocated number of a dummy interrupt.
159 *
160 * @sim: The interrupt simulator object.
161 * @offset: Offset of the simulated interrupt for which to retrieve
162 * the number.
163 */
164int irq_sim_irqnum(struct irq_sim *sim, unsigned int offset)
165{
166 return sim->irqs[offset].irqnum;
167}
168EXPORT_SYMBOL_GPL(irq_sim_irqnum);