Bartosz Golaszewski | da24fe1 | 2017-08-14 16:53:16 +0200 | [diff] [blame] | 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 | |
Bartosz Golaszewski | 59a863a | 2018-03-04 13:10:16 +0100 | [diff] [blame] | 10 | #include <linux/slab.h> |
Bartosz Golaszewski | da24fe1 | 2017-08-14 16:53:16 +0200 | [diff] [blame] | 11 | #include <linux/irq_sim.h> |
| 12 | #include <linux/irq.h> |
| 13 | |
Bartosz Golaszewski | 3e55cfc | 2017-08-14 16:53:17 +0200 | [diff] [blame] | 14 | struct irq_sim_devres { |
| 15 | struct irq_sim *sim; |
| 16 | }; |
| 17 | |
Bartosz Golaszewski | da24fe1 | 2017-08-14 16:53:16 +0200 | [diff] [blame] | 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 | * |
Bartosz Golaszewski | 892f3bc | 2018-03-04 13:10:18 +0100 | [diff] [blame] | 53 | * On success: return the base of the allocated interrupt range. |
| 54 | * On failure: a negative errno. |
Bartosz Golaszewski | da24fe1 | 2017-08-14 16:53:16 +0200 | [diff] [blame] | 55 | */ |
| 56 | int irq_sim_init(struct irq_sim *sim, unsigned int num_irqs) |
| 57 | { |
| 58 | int i; |
| 59 | |
| 60 | sim->irqs = kmalloc_array(num_irqs, sizeof(*sim->irqs), GFP_KERNEL); |
| 61 | if (!sim->irqs) |
| 62 | return -ENOMEM; |
| 63 | |
| 64 | sim->irq_base = irq_alloc_descs(-1, 0, num_irqs, 0); |
| 65 | if (sim->irq_base < 0) { |
| 66 | kfree(sim->irqs); |
| 67 | return sim->irq_base; |
| 68 | } |
| 69 | |
| 70 | for (i = 0; i < num_irqs; i++) { |
| 71 | sim->irqs[i].irqnum = sim->irq_base + i; |
| 72 | sim->irqs[i].enabled = false; |
| 73 | irq_set_chip(sim->irq_base + i, &irq_sim_irqchip); |
| 74 | irq_set_chip_data(sim->irq_base + i, &sim->irqs[i]); |
| 75 | irq_set_handler(sim->irq_base + i, &handle_simple_irq); |
| 76 | irq_modify_status(sim->irq_base + i, |
| 77 | IRQ_NOREQUEST | IRQ_NOAUTOEN, IRQ_NOPROBE); |
| 78 | } |
| 79 | |
| 80 | init_irq_work(&sim->work_ctx.work, irq_sim_handle_irq); |
| 81 | sim->irq_count = num_irqs; |
| 82 | |
Bartosz Golaszewski | 892f3bc | 2018-03-04 13:10:18 +0100 | [diff] [blame] | 83 | return sim->irq_base; |
Bartosz Golaszewski | da24fe1 | 2017-08-14 16:53:16 +0200 | [diff] [blame] | 84 | } |
| 85 | EXPORT_SYMBOL_GPL(irq_sim_init); |
| 86 | |
| 87 | /** |
| 88 | * irq_sim_fini - Deinitialize the interrupt simulator: free the interrupt |
| 89 | * descriptors and allocated memory. |
| 90 | * |
| 91 | * @sim: The interrupt simulator to tear down. |
| 92 | */ |
| 93 | void irq_sim_fini(struct irq_sim *sim) |
| 94 | { |
| 95 | irq_work_sync(&sim->work_ctx.work); |
| 96 | irq_free_descs(sim->irq_base, sim->irq_count); |
| 97 | kfree(sim->irqs); |
| 98 | } |
| 99 | EXPORT_SYMBOL_GPL(irq_sim_fini); |
| 100 | |
Bartosz Golaszewski | 3e55cfc | 2017-08-14 16:53:17 +0200 | [diff] [blame] | 101 | static void devm_irq_sim_release(struct device *dev, void *res) |
| 102 | { |
| 103 | struct irq_sim_devres *this = res; |
| 104 | |
| 105 | irq_sim_fini(this->sim); |
| 106 | } |
| 107 | |
| 108 | /** |
| 109 | * irq_sim_init - Initialize the interrupt simulator for a managed device. |
| 110 | * |
| 111 | * @dev: Device to initialize the simulator object for. |
| 112 | * @sim: The interrupt simulator object to initialize. |
| 113 | * @num_irqs: Number of interrupts to allocate |
| 114 | * |
Bartosz Golaszewski | 892f3bc | 2018-03-04 13:10:18 +0100 | [diff] [blame] | 115 | * On success: return the base of the allocated interrupt range. |
| 116 | * On failure: a negative errno. |
Bartosz Golaszewski | 3e55cfc | 2017-08-14 16:53:17 +0200 | [diff] [blame] | 117 | */ |
| 118 | int devm_irq_sim_init(struct device *dev, struct irq_sim *sim, |
| 119 | unsigned int num_irqs) |
| 120 | { |
| 121 | struct irq_sim_devres *dr; |
| 122 | int rv; |
| 123 | |
| 124 | dr = devres_alloc(devm_irq_sim_release, sizeof(*dr), GFP_KERNEL); |
| 125 | if (!dr) |
| 126 | return -ENOMEM; |
| 127 | |
| 128 | rv = irq_sim_init(sim, num_irqs); |
Bartosz Golaszewski | 4de74b7 | 2018-03-04 13:10:17 +0100 | [diff] [blame] | 129 | if (rv < 0) { |
Bartosz Golaszewski | 3e55cfc | 2017-08-14 16:53:17 +0200 | [diff] [blame] | 130 | devres_free(dr); |
| 131 | return rv; |
| 132 | } |
| 133 | |
| 134 | dr->sim = sim; |
| 135 | devres_add(dev, dr); |
| 136 | |
Bartosz Golaszewski | 892f3bc | 2018-03-04 13:10:18 +0100 | [diff] [blame] | 137 | return rv; |
Bartosz Golaszewski | 3e55cfc | 2017-08-14 16:53:17 +0200 | [diff] [blame] | 138 | } |
| 139 | EXPORT_SYMBOL_GPL(devm_irq_sim_init); |
| 140 | |
Bartosz Golaszewski | da24fe1 | 2017-08-14 16:53:16 +0200 | [diff] [blame] | 141 | /** |
| 142 | * irq_sim_fire - Enqueue an interrupt. |
| 143 | * |
| 144 | * @sim: The interrupt simulator object. |
| 145 | * @offset: Offset of the simulated interrupt which should be fired. |
| 146 | */ |
| 147 | void irq_sim_fire(struct irq_sim *sim, unsigned int offset) |
| 148 | { |
| 149 | if (sim->irqs[offset].enabled) { |
| 150 | sim->work_ctx.irq = irq_sim_irqnum(sim, offset); |
| 151 | irq_work_queue(&sim->work_ctx.work); |
| 152 | } |
| 153 | } |
| 154 | EXPORT_SYMBOL_GPL(irq_sim_fire); |
| 155 | |
| 156 | /** |
| 157 | * irq_sim_irqnum - Get the allocated number of a dummy interrupt. |
| 158 | * |
| 159 | * @sim: The interrupt simulator object. |
| 160 | * @offset: Offset of the simulated interrupt for which to retrieve |
| 161 | * the number. |
| 162 | */ |
| 163 | int irq_sim_irqnum(struct irq_sim *sim, unsigned int offset) |
| 164 | { |
| 165 | return sim->irqs[offset].irqnum; |
| 166 | } |
| 167 | EXPORT_SYMBOL_GPL(irq_sim_irqnum); |