Commit | Line | Data |
---|---|---|
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 | ||
44e72c7e BG |
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 | ||
8d91ecc8 BG |
28 | static 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 | ||
b19af510 BG |
39 | static struct irq_chip irq_sim_irqchip = { |
40 | .name = "irq_sim", | |
41 | .irq_mask = irq_sim_irqmask, | |
42 | .irq_unmask = irq_sim_irqunmask, | |
8d91ecc8 | 43 | .irq_set_type = irq_sim_set_type, |
b19af510 BG |
44 | }; |
45 | ||
46 | static void irq_sim_handle_irq(struct irq_work *work) | |
47 | { | |
48 | struct irq_sim_work_ctx *work_ctx; | |
06459901 BG |
49 | unsigned int offset = 0; |
50 | struct irq_sim *sim; | |
51 | int irqnum; | |
b19af510 BG |
52 | |
53 | work_ctx = container_of(work, struct irq_sim_work_ctx, work); | |
06459901 BG |
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 | } | |
b19af510 BG |
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 | * | |
f09777fa BG |
72 | * On success: return the base of the allocated interrupt range. |
73 | * On failure: a negative errno. | |
b19af510 BG |
74 | */ |
75 | int 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 | ||
06459901 BG |
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 | ||
b19af510 BG |
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 | ||
f09777fa | 109 | return sim->irq_base; |
b19af510 BG |
110 | } |
111 | EXPORT_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 | */ | |
119 | void irq_sim_fini(struct irq_sim *sim) | |
120 | { | |
121 | irq_work_sync(&sim->work_ctx.work); | |
06459901 | 122 | bitmap_free(sim->work_ctx.pending); |
b19af510 BG |
123 | irq_free_descs(sim->irq_base, sim->irq_count); |
124 | kfree(sim->irqs); | |
125 | } | |
126 | EXPORT_SYMBOL_GPL(irq_sim_fini); | |
127 | ||
44e72c7e BG |
128 | static 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 | * | |
f09777fa BG |
142 | * On success: return the base of the allocated interrupt range. |
143 | * On failure: a negative errno. | |
44e72c7e BG |
144 | */ |
145 | int 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); | |
28b6afa7 | 156 | if (rv < 0) { |
44e72c7e BG |
157 | devres_free(dr); |
158 | return rv; | |
159 | } | |
160 | ||
161 | dr->sim = sim; | |
162 | devres_add(dev, dr); | |
163 | ||
f09777fa | 164 | return rv; |
44e72c7e BG |
165 | } |
166 | EXPORT_SYMBOL_GPL(devm_irq_sim_init); | |
167 | ||
b19af510 BG |
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 | */ | |
174 | void irq_sim_fire(struct irq_sim *sim, unsigned int offset) | |
175 | { | |
176 | if (sim->irqs[offset].enabled) { | |
06459901 | 177 | set_bit(offset, sim->work_ctx.pending); |
b19af510 BG |
178 | irq_work_queue(&sim->work_ctx.work); |
179 | } | |
180 | } | |
181 | EXPORT_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 | */ | |
190 | int irq_sim_irqnum(struct irq_sim *sim, unsigned int offset) | |
191 | { | |
192 | return sim->irqs[offset].irqnum; | |
193 | } | |
194 | EXPORT_SYMBOL_GPL(irq_sim_irqnum); |