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1 | /* |
2 | * Copyright (C) 2017 Bartosz Golaszewski <brgl@bgdev.pl> | |
3 | * | |
4 | * This program is free software; you can redistribute it and/or modify it | |
5 | * under the terms of the GNU General Public License as published by the | |
6 | * Free Software Foundation; either version 2 of the License, or (at your | |
7 | * option) any later version. | |
8 | */ | |
9 | ||
34a866bd | 10 | #include <linux/slab.h> |
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11 | #include <linux/irq_sim.h> |
12 | #include <linux/irq.h> | |
13 | ||
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14 | struct irq_sim_devres { |
15 | struct irq_sim *sim; | |
16 | }; | |
17 | ||
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18 | static void irq_sim_irqmask(struct irq_data *data) |
19 | { | |
20 | struct irq_sim_irq_ctx *irq_ctx = irq_data_get_irq_chip_data(data); | |
21 | ||
22 | irq_ctx->enabled = false; | |
23 | } | |
24 | ||
25 | static void irq_sim_irqunmask(struct irq_data *data) | |
26 | { | |
27 | struct irq_sim_irq_ctx *irq_ctx = irq_data_get_irq_chip_data(data); | |
28 | ||
29 | irq_ctx->enabled = true; | |
30 | } | |
31 | ||
32 | static struct irq_chip irq_sim_irqchip = { | |
33 | .name = "irq_sim", | |
34 | .irq_mask = irq_sim_irqmask, | |
35 | .irq_unmask = irq_sim_irqunmask, | |
36 | }; | |
37 | ||
38 | static void irq_sim_handle_irq(struct irq_work *work) | |
39 | { | |
40 | struct irq_sim_work_ctx *work_ctx; | |
41 | ||
42 | work_ctx = container_of(work, struct irq_sim_work_ctx, work); | |
43 | handle_simple_irq(irq_to_desc(work_ctx->irq)); | |
44 | } | |
45 | ||
46 | /** | |
47 | * irq_sim_init - Initialize the interrupt simulator: allocate a range of | |
48 | * dummy interrupts. | |
49 | * | |
50 | * @sim: The interrupt simulator object to initialize. | |
51 | * @num_irqs: Number of interrupts to allocate | |
52 | * | |
53 | * Returns 0 on success and a negative error number on failure. | |
54 | */ | |
55 | int irq_sim_init(struct irq_sim *sim, unsigned int num_irqs) | |
56 | { | |
57 | int i; | |
58 | ||
59 | sim->irqs = kmalloc_array(num_irqs, sizeof(*sim->irqs), GFP_KERNEL); | |
60 | if (!sim->irqs) | |
61 | return -ENOMEM; | |
62 | ||
63 | sim->irq_base = irq_alloc_descs(-1, 0, num_irqs, 0); | |
64 | if (sim->irq_base < 0) { | |
65 | kfree(sim->irqs); | |
66 | return sim->irq_base; | |
67 | } | |
68 | ||
69 | for (i = 0; i < num_irqs; i++) { | |
70 | sim->irqs[i].irqnum = sim->irq_base + i; | |
71 | sim->irqs[i].enabled = false; | |
72 | irq_set_chip(sim->irq_base + i, &irq_sim_irqchip); | |
73 | irq_set_chip_data(sim->irq_base + i, &sim->irqs[i]); | |
74 | irq_set_handler(sim->irq_base + i, &handle_simple_irq); | |
75 | irq_modify_status(sim->irq_base + i, | |
76 | IRQ_NOREQUEST | IRQ_NOAUTOEN, IRQ_NOPROBE); | |
77 | } | |
78 | ||
79 | init_irq_work(&sim->work_ctx.work, irq_sim_handle_irq); | |
80 | sim->irq_count = num_irqs; | |
81 | ||
82 | return 0; | |
83 | } | |
84 | EXPORT_SYMBOL_GPL(irq_sim_init); | |
85 | ||
86 | /** | |
87 | * irq_sim_fini - Deinitialize the interrupt simulator: free the interrupt | |
88 | * descriptors and allocated memory. | |
89 | * | |
90 | * @sim: The interrupt simulator to tear down. | |
91 | */ | |
92 | void irq_sim_fini(struct irq_sim *sim) | |
93 | { | |
94 | irq_work_sync(&sim->work_ctx.work); | |
95 | irq_free_descs(sim->irq_base, sim->irq_count); | |
96 | kfree(sim->irqs); | |
97 | } | |
98 | EXPORT_SYMBOL_GPL(irq_sim_fini); | |
99 | ||
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100 | static void devm_irq_sim_release(struct device *dev, void *res) |
101 | { | |
102 | struct irq_sim_devres *this = res; | |
103 | ||
104 | irq_sim_fini(this->sim); | |
105 | } | |
106 | ||
107 | /** | |
108 | * irq_sim_init - Initialize the interrupt simulator for a managed device. | |
109 | * | |
110 | * @dev: Device to initialize the simulator object for. | |
111 | * @sim: The interrupt simulator object to initialize. | |
112 | * @num_irqs: Number of interrupts to allocate | |
113 | * | |
114 | * Returns 0 on success and a negative error number on failure. | |
115 | */ | |
116 | int devm_irq_sim_init(struct device *dev, struct irq_sim *sim, | |
117 | unsigned int num_irqs) | |
118 | { | |
119 | struct irq_sim_devres *dr; | |
120 | int rv; | |
121 | ||
122 | dr = devres_alloc(devm_irq_sim_release, sizeof(*dr), GFP_KERNEL); | |
123 | if (!dr) | |
124 | return -ENOMEM; | |
125 | ||
126 | rv = irq_sim_init(sim, num_irqs); | |
28b6afa7 | 127 | if (rv < 0) { |
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128 | devres_free(dr); |
129 | return rv; | |
130 | } | |
131 | ||
132 | dr->sim = sim; | |
133 | devres_add(dev, dr); | |
134 | ||
135 | return 0; | |
136 | } | |
137 | EXPORT_SYMBOL_GPL(devm_irq_sim_init); | |
138 | ||
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139 | /** |
140 | * irq_sim_fire - Enqueue an interrupt. | |
141 | * | |
142 | * @sim: The interrupt simulator object. | |
143 | * @offset: Offset of the simulated interrupt which should be fired. | |
144 | */ | |
145 | void irq_sim_fire(struct irq_sim *sim, unsigned int offset) | |
146 | { | |
147 | if (sim->irqs[offset].enabled) { | |
148 | sim->work_ctx.irq = irq_sim_irqnum(sim, offset); | |
149 | irq_work_queue(&sim->work_ctx.work); | |
150 | } | |
151 | } | |
152 | EXPORT_SYMBOL_GPL(irq_sim_fire); | |
153 | ||
154 | /** | |
155 | * irq_sim_irqnum - Get the allocated number of a dummy interrupt. | |
156 | * | |
157 | * @sim: The interrupt simulator object. | |
158 | * @offset: Offset of the simulated interrupt for which to retrieve | |
159 | * the number. | |
160 | */ | |
161 | int irq_sim_irqnum(struct irq_sim *sim, unsigned int offset) | |
162 | { | |
163 | return sim->irqs[offset].irqnum; | |
164 | } | |
165 | EXPORT_SYMBOL_GPL(irq_sim_irqnum); |