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52a65ff5 | 1 | // SPDX-License-Identifier: GPL-2.0+ |
b19af510 | 2 | /* |
275220ca | 3 | * Copyright (C) 2017-2018 Bartosz Golaszewski <brgl@bgdev.pl> |
b19af510 BG |
4 | */ |
5 | ||
34a866bd | 6 | #include <linux/slab.h> |
b19af510 BG |
7 | #include <linux/irq_sim.h> |
8 | #include <linux/irq.h> | |
9 | ||
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10 | struct irq_sim_devres { |
11 | struct irq_sim *sim; | |
12 | }; | |
13 | ||
b19af510 BG |
14 | static 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 | ||
21 | static 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 | ||
28 | static struct irq_chip irq_sim_irqchip = { | |
29 | .name = "irq_sim", | |
30 | .irq_mask = irq_sim_irqmask, | |
31 | .irq_unmask = irq_sim_irqunmask, | |
32 | }; | |
33 | ||
34 | static void irq_sim_handle_irq(struct irq_work *work) | |
35 | { | |
36 | struct irq_sim_work_ctx *work_ctx; | |
37 | ||
38 | work_ctx = container_of(work, struct irq_sim_work_ctx, work); | |
39 | handle_simple_irq(irq_to_desc(work_ctx->irq)); | |
40 | } | |
41 | ||
42 | /** | |
43 | * irq_sim_init - Initialize the interrupt simulator: allocate a range of | |
44 | * dummy interrupts. | |
45 | * | |
46 | * @sim: The interrupt simulator object to initialize. | |
47 | * @num_irqs: Number of interrupts to allocate | |
48 | * | |
f09777fa BG |
49 | * On success: return the base of the allocated interrupt range. |
50 | * On failure: a negative errno. | |
b19af510 BG |
51 | */ |
52 | int irq_sim_init(struct irq_sim *sim, unsigned int num_irqs) | |
53 | { | |
54 | int i; | |
55 | ||
56 | sim->irqs = kmalloc_array(num_irqs, sizeof(*sim->irqs), GFP_KERNEL); | |
57 | if (!sim->irqs) | |
58 | return -ENOMEM; | |
59 | ||
60 | sim->irq_base = irq_alloc_descs(-1, 0, num_irqs, 0); | |
61 | if (sim->irq_base < 0) { | |
62 | kfree(sim->irqs); | |
63 | return sim->irq_base; | |
64 | } | |
65 | ||
66 | for (i = 0; i < num_irqs; i++) { | |
67 | sim->irqs[i].irqnum = sim->irq_base + i; | |
68 | sim->irqs[i].enabled = false; | |
69 | irq_set_chip(sim->irq_base + i, &irq_sim_irqchip); | |
70 | irq_set_chip_data(sim->irq_base + i, &sim->irqs[i]); | |
71 | irq_set_handler(sim->irq_base + i, &handle_simple_irq); | |
72 | irq_modify_status(sim->irq_base + i, | |
73 | IRQ_NOREQUEST | IRQ_NOAUTOEN, IRQ_NOPROBE); | |
74 | } | |
75 | ||
76 | init_irq_work(&sim->work_ctx.work, irq_sim_handle_irq); | |
77 | sim->irq_count = num_irqs; | |
78 | ||
f09777fa | 79 | return sim->irq_base; |
b19af510 BG |
80 | } |
81 | EXPORT_SYMBOL_GPL(irq_sim_init); | |
82 | ||
83 | /** | |
84 | * irq_sim_fini - Deinitialize the interrupt simulator: free the interrupt | |
85 | * descriptors and allocated memory. | |
86 | * | |
87 | * @sim: The interrupt simulator to tear down. | |
88 | */ | |
89 | void irq_sim_fini(struct irq_sim *sim) | |
90 | { | |
91 | irq_work_sync(&sim->work_ctx.work); | |
92 | irq_free_descs(sim->irq_base, sim->irq_count); | |
93 | kfree(sim->irqs); | |
94 | } | |
95 | EXPORT_SYMBOL_GPL(irq_sim_fini); | |
96 | ||
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97 | static void devm_irq_sim_release(struct device *dev, void *res) |
98 | { | |
99 | struct irq_sim_devres *this = res; | |
100 | ||
101 | irq_sim_fini(this->sim); | |
102 | } | |
103 | ||
104 | /** | |
105 | * irq_sim_init - Initialize the interrupt simulator for a managed device. | |
106 | * | |
107 | * @dev: Device to initialize the simulator object for. | |
108 | * @sim: The interrupt simulator object to initialize. | |
109 | * @num_irqs: Number of interrupts to allocate | |
110 | * | |
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111 | * On success: return the base of the allocated interrupt range. |
112 | * On failure: a negative errno. | |
44e72c7e BG |
113 | */ |
114 | int devm_irq_sim_init(struct device *dev, struct irq_sim *sim, | |
115 | unsigned int num_irqs) | |
116 | { | |
117 | struct irq_sim_devres *dr; | |
118 | int rv; | |
119 | ||
120 | dr = devres_alloc(devm_irq_sim_release, sizeof(*dr), GFP_KERNEL); | |
121 | if (!dr) | |
122 | return -ENOMEM; | |
123 | ||
124 | rv = irq_sim_init(sim, num_irqs); | |
28b6afa7 | 125 | if (rv < 0) { |
44e72c7e BG |
126 | devres_free(dr); |
127 | return rv; | |
128 | } | |
129 | ||
130 | dr->sim = sim; | |
131 | devres_add(dev, dr); | |
132 | ||
f09777fa | 133 | return rv; |
44e72c7e BG |
134 | } |
135 | EXPORT_SYMBOL_GPL(devm_irq_sim_init); | |
136 | ||
b19af510 BG |
137 | /** |
138 | * irq_sim_fire - Enqueue an interrupt. | |
139 | * | |
140 | * @sim: The interrupt simulator object. | |
141 | * @offset: Offset of the simulated interrupt which should be fired. | |
142 | */ | |
143 | void irq_sim_fire(struct irq_sim *sim, unsigned int offset) | |
144 | { | |
145 | if (sim->irqs[offset].enabled) { | |
146 | sim->work_ctx.irq = irq_sim_irqnum(sim, offset); | |
147 | irq_work_queue(&sim->work_ctx.work); | |
148 | } | |
149 | } | |
150 | EXPORT_SYMBOL_GPL(irq_sim_fire); | |
151 | ||
152 | /** | |
153 | * irq_sim_irqnum - Get the allocated number of a dummy interrupt. | |
154 | * | |
155 | * @sim: The interrupt simulator object. | |
156 | * @offset: Offset of the simulated interrupt for which to retrieve | |
157 | * the number. | |
158 | */ | |
159 | int irq_sim_irqnum(struct irq_sim *sim, unsigned int offset) | |
160 | { | |
161 | return sim->irqs[offset].irqnum; | |
162 | } | |
163 | EXPORT_SYMBOL_GPL(irq_sim_irqnum); |