Grant Likely | 08a543a | 2011-07-26 03:19:06 -0600 | [diff] [blame] | 1 | /* |
| 2 | * irq_domain - IRQ translation domains |
| 3 | * |
| 4 | * Translation infrastructure between hw and linux irq numbers. This is |
| 5 | * helpful for interrupt controllers to implement mapping between hardware |
| 6 | * irq numbers and the Linux irq number space. |
| 7 | * |
| 8 | * irq_domains also have a hook for translating device tree interrupt |
| 9 | * representation into a hardware irq number that can be mapped back to a |
| 10 | * Linux irq number without any extra platform support code. |
| 11 | * |
Grant Likely | 7bb69ba | 2012-02-14 14:06:48 -0700 | [diff] [blame^] | 12 | * Interrupt controller "domain" data structure. This could be defined as a |
| 13 | * irq domain controller. That is, it handles the mapping between hardware |
| 14 | * and virtual interrupt numbers for a given interrupt domain. The domain |
| 15 | * structure is generally created by the PIC code for a given PIC instance |
| 16 | * (though a domain can cover more than one PIC if they have a flat number |
| 17 | * model). It's the domain callbacks that are responsible for setting the |
| 18 | * irq_chip on a given irq_desc after it's been mapped. |
Grant Likely | 08a543a | 2011-07-26 03:19:06 -0600 | [diff] [blame] | 19 | */ |
Grant Likely | 7bb69ba | 2012-02-14 14:06:48 -0700 | [diff] [blame^] | 20 | |
Grant Likely | 08a543a | 2011-07-26 03:19:06 -0600 | [diff] [blame] | 21 | #ifndef _LINUX_IRQDOMAIN_H |
| 22 | #define _LINUX_IRQDOMAIN_H |
| 23 | |
Grant Likely | 7bb69ba | 2012-02-14 14:06:48 -0700 | [diff] [blame^] | 24 | #include <linux/types.h> |
| 25 | #include <linux/radix-tree.h> |
Grant Likely | 08a543a | 2011-07-26 03:19:06 -0600 | [diff] [blame] | 26 | |
Grant Likely | 08a543a | 2011-07-26 03:19:06 -0600 | [diff] [blame] | 27 | struct device_node; |
| 28 | struct irq_domain; |
Grant Likely | 7bb69ba | 2012-02-14 14:06:48 -0700 | [diff] [blame^] | 29 | struct of_device_id; |
| 30 | |
| 31 | /* This type is the placeholder for a hardware interrupt number. It has to |
| 32 | * be big enough to enclose whatever representation is used by a given |
| 33 | * platform. |
| 34 | */ |
| 35 | typedef unsigned long irq_hw_number_t; |
Grant Likely | 08a543a | 2011-07-26 03:19:06 -0600 | [diff] [blame] | 36 | |
| 37 | /** |
| 38 | * struct irq_domain_ops - Methods for irq_domain objects |
Grant Likely | 7bb69ba | 2012-02-14 14:06:48 -0700 | [diff] [blame^] | 39 | * @match: Match an interrupt controller device node to a host, returns |
| 40 | * 1 on a match |
| 41 | * @map: Create or update a mapping between a virtual irq number and a hw |
| 42 | * irq number. This is called only once for a given mapping. |
| 43 | * @unmap: Dispose of such a mapping |
Grant Likely | 08a543a | 2011-07-26 03:19:06 -0600 | [diff] [blame] | 44 | * @to_irq: (optional) given a local hardware irq number, return the linux |
| 45 | * irq number. If to_irq is not implemented, then the irq_domain |
| 46 | * will use this translation: irq = (domain->irq_base + hwirq) |
Grant Likely | 7bb69ba | 2012-02-14 14:06:48 -0700 | [diff] [blame^] | 47 | * @xlate: Given a device tree node and interrupt specifier, decode |
| 48 | * the hardware irq number and linux irq type value. |
| 49 | * |
| 50 | * Functions below are provided by the driver and called whenever a new mapping |
| 51 | * is created or an old mapping is disposed. The driver can then proceed to |
| 52 | * whatever internal data structures management is required. It also needs |
| 53 | * to setup the irq_desc when returning from map(). |
Grant Likely | 08a543a | 2011-07-26 03:19:06 -0600 | [diff] [blame] | 54 | */ |
| 55 | struct irq_domain_ops { |
Grant Likely | 7bb69ba | 2012-02-14 14:06:48 -0700 | [diff] [blame^] | 56 | int (*match)(struct irq_domain *d, struct device_node *node); |
| 57 | int (*map)(struct irq_domain *d, unsigned int virq, irq_hw_number_t hw); |
| 58 | void (*unmap)(struct irq_domain *d, unsigned int virq); |
Grant Likely | 08a543a | 2011-07-26 03:19:06 -0600 | [diff] [blame] | 59 | unsigned int (*to_irq)(struct irq_domain *d, unsigned long hwirq); |
Grant Likely | 7bb69ba | 2012-02-14 14:06:48 -0700 | [diff] [blame^] | 60 | int (*xlate)(struct irq_domain *d, struct device_node *node, |
| 61 | const u32 *intspec, unsigned int intsize, |
| 62 | unsigned long *out_hwirq, unsigned int *out_type); |
Grant Likely | 08a543a | 2011-07-26 03:19:06 -0600 | [diff] [blame] | 63 | }; |
| 64 | |
| 65 | /** |
| 66 | * struct irq_domain - Hardware interrupt number translation object |
Grant Likely | 7bb69ba | 2012-02-14 14:06:48 -0700 | [diff] [blame^] | 67 | * @link: Element in global irq_domain list. |
| 68 | * @revmap_type: Method used for reverse mapping hwirq numbers to linux irq. This |
| 69 | * will be one of the IRQ_DOMAIN_MAP_* values. |
| 70 | * @revmap_data: Revmap method specific data. |
| 71 | * @ops: pointer to irq_domain methods |
| 72 | * @host_data: private data pointer for use by owner. Not touched by irq_domain |
| 73 | * core code. |
Grant Likely | 08a543a | 2011-07-26 03:19:06 -0600 | [diff] [blame] | 74 | * @irq_base: Start of irq_desc range assigned to the irq_domain. The creator |
| 75 | * of the irq_domain is responsible for allocating the array of |
| 76 | * irq_desc structures. |
| 77 | * @nr_irq: Number of irqs managed by the irq domain |
Rob Herring | 6d27430 | 2011-09-30 10:48:38 -0500 | [diff] [blame] | 78 | * @hwirq_base: Starting number for hwirqs managed by the irq domain |
Grant Likely | 08a543a | 2011-07-26 03:19:06 -0600 | [diff] [blame] | 79 | * @of_node: (optional) Pointer to device tree nodes associated with the |
| 80 | * irq_domain. Used when decoding device tree interrupt specifiers. |
| 81 | */ |
| 82 | struct irq_domain { |
Grant Likely | 7bb69ba | 2012-02-14 14:06:48 -0700 | [diff] [blame^] | 83 | struct list_head link; |
| 84 | |
| 85 | /* type of reverse mapping_technique */ |
| 86 | unsigned int revmap_type; |
| 87 | #define IRQ_DOMAIN_MAP_LEGACY 0 /* legacy 8259, gets irqs 1..15 */ |
| 88 | #define IRQ_DOMAIN_MAP_NOMAP 1 /* no fast reverse mapping */ |
| 89 | #define IRQ_DOMAIN_MAP_LINEAR 2 /* linear map of interrupts */ |
| 90 | #define IRQ_DOMAIN_MAP_TREE 3 /* radix tree */ |
| 91 | union { |
| 92 | struct { |
| 93 | unsigned int size; |
| 94 | unsigned int *revmap; |
| 95 | } linear; |
| 96 | struct radix_tree_root tree; |
| 97 | } revmap_data; |
| 98 | struct irq_domain_ops *ops; |
| 99 | void *host_data; |
| 100 | irq_hw_number_t inval_irq; |
| 101 | |
Grant Likely | 08a543a | 2011-07-26 03:19:06 -0600 | [diff] [blame] | 102 | unsigned int irq_base; |
| 103 | unsigned int nr_irq; |
Rob Herring | 6d27430 | 2011-09-30 10:48:38 -0500 | [diff] [blame] | 104 | unsigned int hwirq_base; |
Grant Likely | 7bb69ba | 2012-02-14 14:06:48 -0700 | [diff] [blame^] | 105 | |
| 106 | /* Optional device node pointer */ |
Grant Likely | 08a543a | 2011-07-26 03:19:06 -0600 | [diff] [blame] | 107 | struct device_node *of_node; |
| 108 | }; |
| 109 | |
Grant Likely | 7bb69ba | 2012-02-14 14:06:48 -0700 | [diff] [blame^] | 110 | #ifdef CONFIG_IRQ_DOMAIN |
Grant Likely | 08a543a | 2011-07-26 03:19:06 -0600 | [diff] [blame] | 111 | /** |
| 112 | * irq_domain_to_irq() - Translate from a hardware irq to a linux irq number |
| 113 | * |
| 114 | * Returns the linux irq number associated with a hardware irq. By default, |
| 115 | * the mapping is irq == domain->irq_base + hwirq, but this mapping can |
| 116 | * be overridden if the irq_domain implements a .to_irq() hook. |
| 117 | */ |
| 118 | static inline unsigned int irq_domain_to_irq(struct irq_domain *d, |
| 119 | unsigned long hwirq) |
| 120 | { |
Rob Herring | 6d27430 | 2011-09-30 10:48:38 -0500 | [diff] [blame] | 121 | if (d->ops->to_irq) |
| 122 | return d->ops->to_irq(d, hwirq); |
| 123 | if (WARN_ON(hwirq < d->hwirq_base)) |
| 124 | return 0; |
| 125 | return d->irq_base + hwirq - d->hwirq_base; |
Grant Likely | 08a543a | 2011-07-26 03:19:06 -0600 | [diff] [blame] | 126 | } |
| 127 | |
Rob Herring | 6d27430 | 2011-09-30 10:48:38 -0500 | [diff] [blame] | 128 | #define irq_domain_for_each_hwirq(d, hw) \ |
| 129 | for (hw = d->hwirq_base; hw < d->hwirq_base + d->nr_irq; hw++) |
| 130 | |
| 131 | #define irq_domain_for_each_irq(d, hw, irq) \ |
| 132 | for (hw = d->hwirq_base, irq = irq_domain_to_irq(d, hw); \ |
| 133 | hw < d->hwirq_base + d->nr_irq; \ |
| 134 | hw++, irq = irq_domain_to_irq(d, hw)) |
| 135 | |
Grant Likely | 08a543a | 2011-07-26 03:19:06 -0600 | [diff] [blame] | 136 | extern void irq_domain_add(struct irq_domain *domain); |
| 137 | extern void irq_domain_del(struct irq_domain *domain); |
Jamie Iles | c87fb57 | 2011-12-14 23:43:16 +0100 | [diff] [blame] | 138 | |
| 139 | extern struct irq_domain_ops irq_domain_simple_ops; |
Grant Likely | 08a543a | 2011-07-26 03:19:06 -0600 | [diff] [blame] | 140 | #endif /* CONFIG_IRQ_DOMAIN */ |
| 141 | |
Grant Likely | 7e71330 | 2011-07-26 03:19:06 -0600 | [diff] [blame] | 142 | #if defined(CONFIG_IRQ_DOMAIN) && defined(CONFIG_OF_IRQ) |
| 143 | extern void irq_domain_add_simple(struct device_node *controller, int irq_base); |
| 144 | extern void irq_domain_generate_simple(const struct of_device_id *match, |
| 145 | u64 phys_base, unsigned int irq_start); |
| 146 | #else /* CONFIG_IRQ_DOMAIN && CONFIG_OF_IRQ */ |
| 147 | static inline void irq_domain_generate_simple(const struct of_device_id *match, |
| 148 | u64 phys_base, unsigned int irq_start) { } |
| 149 | #endif /* CONFIG_IRQ_DOMAIN && CONFIG_OF_IRQ */ |
| 150 | |
Grant Likely | 08a543a | 2011-07-26 03:19:06 -0600 | [diff] [blame] | 151 | #endif /* _LINUX_IRQDOMAIN_H */ |