| 1 | #include <linux/module.h>
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| 2 | #include <linux/interrupt.h>
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| 3 | #include <linux/device.h>
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| 4 | #include <linux/gfp.h>
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| 5 | #include <linux/irq.h>
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| 6 |
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| 7 | #include "internals.h"
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| 8 |
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| 9 | |
| 10 | * Device resource management aware IRQ request/free implementation.
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| 11 |
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| 12 | struct irq_devres {
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| 13 | unsigned int irq;
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| 14 | void *dev_id;
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| 15 | };
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| 16 |
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| 17 | static void devm_irq_release(struct device *dev, void *res)
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| 18 | {
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| 19 | struct irq_devres *this = res;
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| 20 |
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| 21 | free_irq(this->irq, this->dev_id);
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| 22 | }
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| 23 |
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| 24 | static int devm_irq_match(struct device *dev, void *res, void *data)
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| 25 | {
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| 26 | struct irq_devres *this = res, *match = data;
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| 27 |
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| 28 | return this->irq == match->irq && this->dev_id == match->dev_id;
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| 29 | }
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| 30 |
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| 31 | |
| 32 | * devm_request_threaded_irq - allocate an interrupt line for a managed device
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| 33 | * @dev: device to request interrupt for
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| 34 | * @irq: Interrupt line to allocate
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| 35 | * @handler: Function to be called when the IRQ occurs
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| 36 | * @thread_fn: function to be called in a threaded interrupt context. NULL
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| 37 | * for devices which handle everything in @handler
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| 38 | * @irqflags: Interrupt type flags
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| 39 | * @devname: An ascii name for the claiming device, dev_name(dev) if NULL
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| 40 | * @dev_id: A cookie passed back to the handler function
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| 41 | *
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| 42 | * Except for the extra @dev argument, this function takes the
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| 43 | * same arguments and performs the same function as
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| 44 | * request_threaded_irq(). IRQs requested with this function will be
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| 45 | * automatically freed on driver detach.
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| 46 | *
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| 47 | * If an IRQ allocated with this function needs to be freed
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| 48 | * separately, devm_free_irq() must be used.
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| 49 |
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| 50 | int devm_request_threaded_irq(struct device *dev, unsigned int irq,
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| 51 | irq_handler_t handler, irq_handler_t thread_fn,
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| 52 | unsigned long irqflags, const char *devname,
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| 53 | void *dev_id)
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| 54 | {
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| 55 | struct irq_devres *dr;
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| 56 | int rc;
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| 57 |
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| 58 | dr = devres_alloc(devm_irq_release, sizeof(struct irq_devres),
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| 59 | GFP_KERNEL);
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| 60 | if (!dr)
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| 61 | return -ENOMEM;
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| 62 |
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| 63 | if (!devname)
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| 64 | devname = dev_name(dev);
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| 65 |
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| 66 | rc = request_threaded_irq(irq, handler, thread_fn, irqflags, devname,
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| 67 | dev_id);
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| 68 | if (rc) {
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| 69 | devres_free(dr);
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| 70 | return rc;
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| 71 | }
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| 72 |
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| 73 | dr->irq = irq;
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| 74 | dr->dev_id = dev_id;
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| 75 | devres_add(dev, dr);
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| 76 |
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| 77 | return 0;
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| 78 | }
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| 79 | EXPORT_SYMBOL(devm_request_threaded_irq);
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| 80 |
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| 81 | |
| 82 | * devm_request_any_context_irq - allocate an interrupt line for a managed device
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| 83 | * @dev: device to request interrupt for
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| 84 | * @irq: Interrupt line to allocate
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| 85 | * @handler: Function to be called when the IRQ occurs
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| 86 | * @thread_fn: function to be called in a threaded interrupt context. NULL
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| 87 | * for devices which handle everything in @handler
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| 88 | * @irqflags: Interrupt type flags
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| 89 | * @devname: An ascii name for the claiming device, dev_name(dev) if NULL
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| 90 | * @dev_id: A cookie passed back to the handler function
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| 91 | *
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| 92 | * Except for the extra @dev argument, this function takes the
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| 93 | * same arguments and performs the same function as
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| 94 | * request_any_context_irq(). IRQs requested with this function will be
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| 95 | * automatically freed on driver detach.
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| 96 | *
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| 97 | * If an IRQ allocated with this function needs to be freed
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| 98 | * separately, devm_free_irq() must be used.
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| 99 |
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| 100 | int devm_request_any_context_irq(struct device *dev, unsigned int irq,
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| 101 | irq_handler_t handler, unsigned long irqflags,
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| 102 | const char *devname, void *dev_id)
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| 103 | {
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| 104 | struct irq_devres *dr;
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| 105 | int rc;
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| 106 |
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| 107 | dr = devres_alloc(devm_irq_release, sizeof(struct irq_devres),
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| 108 | GFP_KERNEL);
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| 109 | if (!dr)
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| 110 | return -ENOMEM;
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| 111 |
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| 112 | if (!devname)
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| 113 | devname = dev_name(dev);
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| 114 |
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| 115 | rc = request_any_context_irq(irq, handler, irqflags, devname, dev_id);
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| 116 | if (rc < 0) {
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| 117 | devres_free(dr);
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| 118 | return rc;
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| 119 | }
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| 120 |
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| 121 | dr->irq = irq;
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| 122 | dr->dev_id = dev_id;
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| 123 | devres_add(dev, dr);
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| 124 |
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| 125 | return rc;
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| 126 | }
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| 127 | EXPORT_SYMBOL(devm_request_any_context_irq);
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| 128 |
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| 129 | |
| 130 | * devm_free_irq - free an interrupt
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| 131 | * @dev: device to free interrupt for
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| 132 | * @irq: Interrupt line to free
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| 133 | * @dev_id: Device identity to free
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| 134 | *
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| 135 | * Except for the extra @dev argument, this function takes the
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| 136 | * same arguments and performs the same function as free_irq().
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| 137 | * This function instead of free_irq() should be used to manually
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| 138 | * free IRQs allocated with devm_request_irq().
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| 139 |
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| 140 | void devm_free_irq(struct device *dev, unsigned int irq, void *dev_id)
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| 141 | {
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| 142 | struct irq_devres match_data = { irq, dev_id };
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| 143 |
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| 144 | WARN_ON(devres_destroy(dev, devm_irq_release, devm_irq_match,
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| 145 | &match_data));
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| 146 | free_irq(irq, dev_id);
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| 147 | }
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| 148 | EXPORT_SYMBOL(devm_free_irq);
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| 149 |
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| 150 | struct irq_desc_devres {
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| 151 | unsigned int from;
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| 152 | unsigned int cnt;
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| 153 | };
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| 154 |
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| 155 | static void devm_irq_desc_release(struct device *dev, void *res)
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| 156 | {
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| 157 | struct irq_desc_devres *this = res;
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| 158 |
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| 159 | irq_free_descs(this->from, this->cnt);
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| 160 | }
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| 161 |
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| 162 | |
| 163 | * __devm_irq_alloc_descs - Allocate and initialize a range of irq descriptors
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| 164 | * for a managed device
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| 165 | * @dev: Device to allocate the descriptors for
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| 166 | * @irq: Allocate for specific irq number if irq >= 0
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| 167 | * @from: Start the search from this irq number
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| 168 | * @cnt: Number of consecutive irqs to allocate
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| 169 | * @node: Preferred node on which the irq descriptor should be allocated
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| 170 | * @owner: Owning module (can be NULL)
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| 171 | * @affinity: Optional pointer to an affinity mask array of size @cnt
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| 172 | * which hints where the irq descriptors should be allocated
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| 173 | * and which default affinities to use
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| 174 | *
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| 175 | * Returns the first irq number or error code.
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| 176 | *
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| 177 | * Note: Use the provided wrappers (devm_irq_alloc_desc*) for simplicity.
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| 178 |
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| 179 | int __devm_irq_alloc_descs(struct device *dev, int irq, unsigned int from,
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| 180 | unsigned int cnt, int node, struct module *owner,
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| 181 | const struct cpumask *affinity)
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| 182 | {
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| 183 | struct irq_desc_devres *dr;
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| 184 | int base;
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| 185 |
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| 186 | dr = devres_alloc(devm_irq_desc_release, sizeof(*dr), GFP_KERNEL);
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| 187 | if (!dr)
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| 188 | return -ENOMEM;
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| 189 |
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| 190 | base = __irq_alloc_descs(irq, from, cnt, node, owner, affinity);
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| 191 | if (base < 0) {
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| 192 | devres_free(dr);
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| 193 | return base;
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| 194 | }
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| 195 |
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| 196 | dr->from = base;
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| 197 | dr->cnt = cnt;
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| 198 | devres_add(dev, dr);
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| 199 |
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| 200 | return base;
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| 201 | }
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| 202 | EXPORT_SYMBOL_GPL(__devm_irq_alloc_descs);
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| 203 |
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| 204 | #ifdef CONFIG_GENERIC_IRQ_CHIP
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| 205 | |
| 206 | * devm_irq_alloc_generic_chip - Allocate and initialize a generic chip
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| 207 | * for a managed device
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| 208 | * @dev: Device to allocate the generic chip for
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| 209 | * @name: Name of the irq chip
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| 210 | * @num_ct: Number of irq_chip_type instances associated with this
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| 211 | * @irq_base: Interrupt base nr for this chip
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| 212 | * @reg_base: Register base address (virtual)
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| 213 | * @handler: Default flow handler associated with this chip
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| 214 | *
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| 215 | * Returns an initialized irq_chip_generic structure. The chip defaults
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| 216 | * to the primary (index 0) irq_chip_type and @handler
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| 217 |
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| 218 | struct irq_chip_generic *
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| 219 | devm_irq_alloc_generic_chip(struct device *dev, const char *name, int num_ct,
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| 220 | unsigned int irq_base, void __iomem *reg_base,
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| 221 | irq_flow_handler_t handler)
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| 222 | {
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| 223 | struct irq_chip_generic *gc;
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| 224 | unsigned long sz = sizeof(*gc) + num_ct * sizeof(struct irq_chip_type);
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| 225 |
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| 226 | gc = devm_kzalloc(dev, sz, GFP_KERNEL);
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| 227 | if (gc)
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| 228 | irq_init_generic_chip(gc, name, num_ct,
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| 229 | irq_base, reg_base, handler);
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| 230 |
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| 231 | return gc;
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| 232 | }
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| 233 | EXPORT_SYMBOL_GPL(devm_irq_alloc_generic_chip);
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| 234 |
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| 235 | struct irq_generic_chip_devres {
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| 236 | struct irq_chip_generic *gc;
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| 237 | u32 msk;
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| 238 | unsigned int clr;
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| 239 | unsigned int set;
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| 240 | };
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| 241 |
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| 242 | static void devm_irq_remove_generic_chip(struct device *dev, void *res)
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| 243 | {
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| 244 | struct irq_generic_chip_devres *this = res;
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| 245 |
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| 246 | irq_remove_generic_chip(this->gc, this->msk, this->clr, this->set);
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| 247 | }
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| 248 |
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| 249 | |
| 250 | * devm_irq_setup_generic_chip - Setup a range of interrupts with a generic
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| 251 | * chip for a managed device
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| 252 | *
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| 253 | * @dev: Device to setup the generic chip for
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| 254 | * @gc: Generic irq chip holding all data
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| 255 | * @msk: Bitmask holding the irqs to initialize relative to gc->irq_base
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| 256 | * @flags: Flags for initialization
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| 257 | * @clr: IRQ_* bits to clear
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| 258 | * @set: IRQ_* bits to set
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| 259 | *
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| 260 | * Set up max. 32 interrupts starting from gc->irq_base. Note, this
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| 261 | * initializes all interrupts to the primary irq_chip_type and its
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| 262 | * associated handler.
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| 263 |
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| 264 | int devm_irq_setup_generic_chip(struct device *dev, struct irq_chip_generic *gc,
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| 265 | u32 msk, enum irq_gc_flags flags,
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| 266 | unsigned int clr, unsigned int set)
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| 267 | {
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| 268 | struct irq_generic_chip_devres *dr;
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| 269 |
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| 270 | dr = devres_alloc(devm_irq_remove_generic_chip,
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| 271 | sizeof(*dr), GFP_KERNEL);
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| 272 | if (!dr)
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| 273 | return -ENOMEM;
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| 274 |
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| 275 | irq_setup_generic_chip(gc, msk, flags, clr, set);
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| 276 |
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| 277 | dr->gc = gc;
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| 278 | dr->msk = msk;
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| 279 | dr->clr = clr;
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| 280 | dr->set = set;
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| 281 | devres_add(dev, dr);
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| 282 |
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| 283 | return 0;
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| 284 | }
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| 285 | EXPORT_SYMBOL_GPL(devm_irq_setup_generic_chip);
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| 286 | #endif
|