projects / linux-2.6-block.git / blame
| Commit | Line | Data |
|---|---|---|
| d8f4f161 LP |
1 | /* |
| 2 | * ACPI GSI IRQ layer | |
| 3 | * | |
| 4 | * Copyright (C) 2015 ARM Ltd. | |
| 5 | * Author: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com> | |
| 6 | * | |
| 7 | * This program is free software; you can redistribute it and/or modify | |
| 8 | * it under the terms of the GNU General Public License version 2 as | |
| 9 | * published by the Free Software Foundation. | |
| 10 | */ | |
| 11 | #include <linux/acpi.h> | |
| 12 | #include <linux/irq.h> | |
| 13 | #include <linux/irqdomain.h> | |
| d7f8504d | 14 | #include <linux/of.h> |
| d8f4f161 LP |
15 | |
| 16 | enum acpi_irq_model_id acpi_irq_model; | |
| 17 | ||
| d7f8504d MZ |
18 | static struct fwnode_handle *acpi_gsi_domain_id; |
| 19 | ||
| d8f4f161 LP |
20 | /** |
| 21 | * acpi_gsi_to_irq() - Retrieve the linux irq number for a given GSI | |
| 22 | * @gsi: GSI IRQ number to map | |
| 23 | * @irq: pointer where linux IRQ number is stored | |
| 24 | * | |
| 25 | * irq location updated with irq value [>0 on success, 0 on failure] | |
| 26 | * | |
| 27 | * Returns: linux IRQ number on success (>0) | |
| 28 | * -EINVAL on failure | |
| 29 | */ | |
| 30 | int acpi_gsi_to_irq(u32 gsi, unsigned int *irq) | |
| 31 | { | |
| d7f8504d MZ |
32 | struct irq_domain *d = irq_find_matching_fwnode(acpi_gsi_domain_id, |
| 33 | DOMAIN_BUS_ANY); | |
| 34 | ||
| 35 | *irq = irq_find_mapping(d, gsi); | |
| d8f4f161 LP |
36 | /* |
| 37 | * *irq == 0 means no mapping, that should | |
| 38 | * be reported as a failure | |
| 39 | */ | |
| 40 | return (*irq > 0) ? *irq : -EINVAL; | |
| 41 | } | |
| 42 | EXPORT_SYMBOL_GPL(acpi_gsi_to_irq); | |
| 43 | ||
| 44 | /** | |
| 45 | * acpi_register_gsi() - Map a GSI to a linux IRQ number | |
| 46 | * @dev: device for which IRQ has to be mapped | |
| 47 | * @gsi: GSI IRQ number | |
| 48 | * @trigger: trigger type of the GSI number to be mapped | |
| 49 | * @polarity: polarity of the GSI to be mapped | |
| 50 | * | |
| 51 | * Returns: a valid linux IRQ number on success | |
| 52 | * -EINVAL on failure | |
| 53 | */ | |
| 54 | int acpi_register_gsi(struct device *dev, u32 gsi, int trigger, | |
| 55 | int polarity) | |
| 56 | { | |
| 462e4fc7 | 57 | struct irq_fwspec fwspec; |
| d8f4f161 | 58 | |
| 462e4fc7 MZ |
59 | if (WARN_ON(!acpi_gsi_domain_id)) { |
| 60 | pr_warn("GSI: No registered irqchip, giving up\n"); | |
| 61 | return -EINVAL; | |
| 2bc6eba4 | 62 | } |
| d8f4f161 | 63 | |
| 462e4fc7 MZ |
64 | fwspec.fwnode = acpi_gsi_domain_id; |
| 65 | fwspec.param[0] = gsi; | |
| 55a93417 | 66 | fwspec.param[1] = acpi_dev_get_irq_type(trigger, polarity); |
| 462e4fc7 MZ |
67 | fwspec.param_count = 2; |
| 68 | ||
| 69 | return irq_create_fwspec_mapping(&fwspec); | |
| d8f4f161 LP |
70 | } |
| 71 | EXPORT_SYMBOL_GPL(acpi_register_gsi); | |
| 72 | ||
| 73 | /** | |
| 74 | * acpi_unregister_gsi() - Free a GSI<->linux IRQ number mapping | |
| 75 | * @gsi: GSI IRQ number | |
| 76 | */ | |
| 77 | void acpi_unregister_gsi(u32 gsi) | |
| 78 | { | |
| d7f8504d MZ |
79 | struct irq_domain *d = irq_find_matching_fwnode(acpi_gsi_domain_id, |
| 80 | DOMAIN_BUS_ANY); | |
| 81 | int irq = irq_find_mapping(d, gsi); | |
| d8f4f161 LP |
82 | |
| 83 | irq_dispose_mapping(irq); | |
| 84 | } | |
| 85 | EXPORT_SYMBOL_GPL(acpi_unregister_gsi); | |
| 2bc6eba4 MZ |
86 | |
| 87 | /** | |
| 88 | * acpi_set_irq_model - Setup the GSI irqdomain information | |
| 89 | * @model: the value assigned to acpi_irq_model | |
| 90 | * @fwnode: the irq_domain identifier for mapping and looking up | |
| 91 | * GSI interrupts | |
| 92 | */ | |
| 93 | void __init acpi_set_irq_model(enum acpi_irq_model_id model, | |
| 94 | struct fwnode_handle *fwnode) | |
| 95 | { | |
| 96 | acpi_irq_model = model; | |
| 97 | acpi_gsi_domain_id = fwnode; | |
| 98 | } |