380 lines
13 KiB
C
380 lines
13 KiB
C
#ifdef __KERNEL__
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#ifndef _ASM_POWERPC_IRQ_H
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#define _ASM_POWERPC_IRQ_H
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/*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version
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* 2 of the License, or (at your option) any later version.
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*/
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#include <linux/threads.h>
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#include <linux/list.h>
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#include <linux/radix-tree.h>
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#include <asm/types.h>
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#include <asm/atomic.h>
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#define get_irq_desc(irq) (&irq_desc[(irq)])
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/* Define a way to iterate across irqs. */
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#define for_each_irq(i) \
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for ((i) = 0; (i) < NR_IRQS; ++(i))
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extern atomic_t ppc_n_lost_interrupts;
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/* This number is used when no interrupt has been assigned */
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#define NO_IRQ (0)
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/* This is a special irq number to return from get_irq() to tell that
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* no interrupt happened _and_ ignore it (don't count it as bad). Some
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* platforms like iSeries rely on that.
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*/
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#define NO_IRQ_IGNORE ((unsigned int)-1)
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/* Total number of virq in the platform (make it a CONFIG_* option ? */
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#define NR_IRQS 512
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/* Number of irqs reserved for the legacy controller */
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#define NUM_ISA_INTERRUPTS 16
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/* This type is the placeholder for a hardware interrupt number. It has to
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* be big enough to enclose whatever representation is used by a given
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* platform.
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*/
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typedef unsigned long irq_hw_number_t;
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/* Interrupt controller "host" data structure. This could be defined as a
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* irq domain controller. That is, it handles the mapping between hardware
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* and virtual interrupt numbers for a given interrupt domain. The host
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* structure is generally created by the PIC code for a given PIC instance
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* (though a host can cover more than one PIC if they have a flat number
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* model). It's the host callbacks that are responsible for setting the
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* irq_chip on a given irq_desc after it's been mapped.
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*
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* The host code and data structures are fairly agnostic to the fact that
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* we use an open firmware device-tree. We do have references to struct
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* device_node in two places: in irq_find_host() to find the host matching
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* a given interrupt controller node, and of course as an argument to its
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* counterpart host->ops->match() callback. However, those are treated as
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* generic pointers by the core and the fact that it's actually a device-node
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* pointer is purely a convention between callers and implementation. This
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* code could thus be used on other architectures by replacing those two
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* by some sort of arch-specific void * "token" used to identify interrupt
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* controllers.
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*/
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struct irq_host;
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struct radix_tree_root;
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/* Functions below are provided by the host and called whenever a new mapping
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* is created or an old mapping is disposed. The host can then proceed to
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* whatever internal data structures management is required. It also needs
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* to setup the irq_desc when returning from map().
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*/
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struct irq_host_ops {
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/* Match an interrupt controller device node to a host, returns
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* 1 on a match
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*/
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int (*match)(struct irq_host *h, struct device_node *node);
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/* Create or update a mapping between a virtual irq number and a hw
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* irq number. This is called only once for a given mapping.
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*/
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int (*map)(struct irq_host *h, unsigned int virq, irq_hw_number_t hw);
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/* Dispose of such a mapping */
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void (*unmap)(struct irq_host *h, unsigned int virq);
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/* Update of such a mapping */
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void (*remap)(struct irq_host *h, unsigned int virq, irq_hw_number_t hw);
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/* Translate device-tree interrupt specifier from raw format coming
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* from the firmware to a irq_hw_number_t (interrupt line number) and
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* type (sense) that can be passed to set_irq_type(). In the absence
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* of this callback, irq_create_of_mapping() and irq_of_parse_and_map()
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* will return the hw number in the first cell and IRQ_TYPE_NONE for
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* the type (which amount to keeping whatever default value the
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* interrupt controller has for that line)
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*/
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int (*xlate)(struct irq_host *h, struct device_node *ctrler,
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u32 *intspec, unsigned int intsize,
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irq_hw_number_t *out_hwirq, unsigned int *out_type);
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};
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struct irq_host {
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struct list_head link;
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/* type of reverse mapping technique */
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unsigned int revmap_type;
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#define IRQ_HOST_MAP_LEGACY 0 /* legacy 8259, gets irqs 1..15 */
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#define IRQ_HOST_MAP_NOMAP 1 /* no fast reverse mapping */
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#define IRQ_HOST_MAP_LINEAR 2 /* linear map of interrupts */
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#define IRQ_HOST_MAP_TREE 3 /* radix tree */
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union {
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struct {
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unsigned int size;
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unsigned int *revmap;
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} linear;
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struct radix_tree_root tree;
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} revmap_data;
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struct irq_host_ops *ops;
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void *host_data;
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irq_hw_number_t inval_irq;
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/* Optional device node pointer */
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struct device_node *of_node;
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};
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/* The main irq map itself is an array of NR_IRQ entries containing the
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* associate host and irq number. An entry with a host of NULL is free.
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* An entry can be allocated if it's free, the allocator always then sets
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* hwirq first to the host's invalid irq number and then fills ops.
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*/
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struct irq_map_entry {
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irq_hw_number_t hwirq;
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struct irq_host *host;
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};
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extern struct irq_map_entry irq_map[NR_IRQS];
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extern irq_hw_number_t virq_to_hw(unsigned int virq);
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/**
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* irq_alloc_host - Allocate a new irq_host data structure
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* @of_node: optional device-tree node of the interrupt controller
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* @revmap_type: type of reverse mapping to use
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* @revmap_arg: for IRQ_HOST_MAP_LINEAR linear only: size of the map
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* @ops: map/unmap host callbacks
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* @inval_irq: provide a hw number in that host space that is always invalid
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*
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* Allocates and initialize and irq_host structure. Note that in the case of
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* IRQ_HOST_MAP_LEGACY, the map() callback will be called before this returns
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* for all legacy interrupts except 0 (which is always the invalid irq for
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* a legacy controller). For a IRQ_HOST_MAP_LINEAR, the map is allocated by
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* this call as well. For a IRQ_HOST_MAP_TREE, the radix tree will be allocated
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* later during boot automatically (the reverse mapping will use the slow path
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* until that happens).
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*/
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extern struct irq_host *irq_alloc_host(struct device_node *of_node,
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unsigned int revmap_type,
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unsigned int revmap_arg,
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struct irq_host_ops *ops,
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irq_hw_number_t inval_irq);
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/**
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* irq_find_host - Locates a host for a given device node
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* @node: device-tree node of the interrupt controller
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*/
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extern struct irq_host *irq_find_host(struct device_node *node);
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/**
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* irq_set_default_host - Set a "default" host
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* @host: default host pointer
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*
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* For convenience, it's possible to set a "default" host that will be used
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* whenever NULL is passed to irq_create_mapping(). It makes life easier for
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* platforms that want to manipulate a few hard coded interrupt numbers that
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* aren't properly represented in the device-tree.
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*/
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extern void irq_set_default_host(struct irq_host *host);
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/**
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* irq_set_virq_count - Set the maximum number of virt irqs
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* @count: number of linux virtual irqs, capped with NR_IRQS
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*
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* This is mainly for use by platforms like iSeries who want to program
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* the virtual irq number in the controller to avoid the reverse mapping
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*/
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extern void irq_set_virq_count(unsigned int count);
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/**
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* irq_create_mapping - Map a hardware interrupt into linux virq space
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* @host: host owning this hardware interrupt or NULL for default host
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* @hwirq: hardware irq number in that host space
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*
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* Only one mapping per hardware interrupt is permitted. Returns a linux
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* virq number.
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* If the sense/trigger is to be specified, set_irq_type() should be called
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* on the number returned from that call.
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*/
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extern unsigned int irq_create_mapping(struct irq_host *host,
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irq_hw_number_t hwirq);
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/**
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* irq_dispose_mapping - Unmap an interrupt
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* @virq: linux virq number of the interrupt to unmap
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*/
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extern void irq_dispose_mapping(unsigned int virq);
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/**
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* irq_find_mapping - Find a linux virq from an hw irq number.
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* @host: host owning this hardware interrupt
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* @hwirq: hardware irq number in that host space
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*
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* This is a slow path, for use by generic code. It's expected that an
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* irq controller implementation directly calls the appropriate low level
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* mapping function.
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*/
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extern unsigned int irq_find_mapping(struct irq_host *host,
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irq_hw_number_t hwirq);
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/**
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* irq_create_direct_mapping - Allocate a virq for direct mapping
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* @host: host to allocate the virq for or NULL for default host
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*
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* This routine is used for irq controllers which can choose the hardware
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* interrupt numbers they generate. In such a case it's simplest to use
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* the linux virq as the hardware interrupt number.
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*/
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extern unsigned int irq_create_direct_mapping(struct irq_host *host);
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/**
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* irq_radix_revmap_insert - Insert a hw irq to linux virq number mapping.
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* @host: host owning this hardware interrupt
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* @virq: linux irq number
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* @hwirq: hardware irq number in that host space
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*
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* This is for use by irq controllers that use a radix tree reverse
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* mapping for fast lookup.
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*/
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extern void irq_radix_revmap_insert(struct irq_host *host, unsigned int virq,
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irq_hw_number_t hwirq);
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/**
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* irq_radix_revmap_lookup - Find a linux virq from a hw irq number.
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* @host: host owning this hardware interrupt
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* @hwirq: hardware irq number in that host space
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*
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* This is a fast path, for use by irq controller code that uses radix tree
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* revmaps
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*/
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extern unsigned int irq_radix_revmap_lookup(struct irq_host *host,
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irq_hw_number_t hwirq);
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/**
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* irq_linear_revmap - Find a linux virq from a hw irq number.
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* @host: host owning this hardware interrupt
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* @hwirq: hardware irq number in that host space
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*
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* This is a fast path, for use by irq controller code that uses linear
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* revmaps. It does fallback to the slow path if the revmap doesn't exist
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* yet and will create the revmap entry with appropriate locking
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*/
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extern unsigned int irq_linear_revmap(struct irq_host *host,
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irq_hw_number_t hwirq);
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/**
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* irq_alloc_virt - Allocate virtual irq numbers
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* @host: host owning these new virtual irqs
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* @count: number of consecutive numbers to allocate
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* @hint: pass a hint number, the allocator will try to use a 1:1 mapping
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*
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* This is a low level function that is used internally by irq_create_mapping()
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* and that can be used by some irq controllers implementations for things
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* like allocating ranges of numbers for MSIs. The revmaps are left untouched.
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*/
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extern unsigned int irq_alloc_virt(struct irq_host *host,
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unsigned int count,
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unsigned int hint);
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/**
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* irq_free_virt - Free virtual irq numbers
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* @virq: virtual irq number of the first interrupt to free
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* @count: number of interrupts to free
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*
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* This function is the opposite of irq_alloc_virt. It will not clear reverse
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* maps, this should be done previously by unmap'ing the interrupt. In fact,
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* all interrupts covered by the range being freed should have been unmapped
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* prior to calling this.
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*/
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extern void irq_free_virt(unsigned int virq, unsigned int count);
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/* -- OF helpers -- */
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/**
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* irq_create_of_mapping - Map a hardware interrupt into linux virq space
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* @controller: Device node of the interrupt controller
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* @inspec: Interrupt specifier from the device-tree
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* @intsize: Size of the interrupt specifier from the device-tree
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*
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* This function is identical to irq_create_mapping except that it takes
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* as input informations straight from the device-tree (typically the results
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* of the of_irq_map_*() functions.
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*/
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extern unsigned int irq_create_of_mapping(struct device_node *controller,
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u32 *intspec, unsigned int intsize);
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/**
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* irq_of_parse_and_map - Parse and Map an interrupt into linux virq space
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* @device: Device node of the device whose interrupt is to be mapped
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* @index: Index of the interrupt to map
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*
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* This function is a wrapper that chains of_irq_map_one() and
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* irq_create_of_mapping() to make things easier to callers
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*/
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extern unsigned int irq_of_parse_and_map(struct device_node *dev, int index);
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/* -- End OF helpers -- */
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/**
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* irq_early_init - Init irq remapping subsystem
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*/
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extern void irq_early_init(void);
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static __inline__ int irq_canonicalize(int irq)
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{
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return irq;
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}
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extern int distribute_irqs;
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struct irqaction;
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struct pt_regs;
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#define __ARCH_HAS_DO_SOFTIRQ
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#if defined(CONFIG_BOOKE) || defined(CONFIG_40x)
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/*
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* Per-cpu stacks for handling critical, debug and machine check
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* level interrupts.
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*/
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extern struct thread_info *critirq_ctx[NR_CPUS];
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extern struct thread_info *dbgirq_ctx[NR_CPUS];
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extern struct thread_info *mcheckirq_ctx[NR_CPUS];
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extern void exc_lvl_ctx_init(void);
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#else
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#define exc_lvl_ctx_init()
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#endif
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#ifdef CONFIG_IRQSTACKS
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/*
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* Per-cpu stacks for handling hard and soft interrupts.
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*/
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extern struct thread_info *hardirq_ctx[NR_CPUS];
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extern struct thread_info *softirq_ctx[NR_CPUS];
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extern void irq_ctx_init(void);
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extern void call_do_softirq(struct thread_info *tp);
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extern int call_handle_irq(int irq, void *p1,
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struct thread_info *tp, void *func);
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#else
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#define irq_ctx_init()
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#endif /* CONFIG_IRQSTACKS */
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extern void do_IRQ(struct pt_regs *regs);
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#endif /* _ASM_IRQ_H */
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#endif /* __KERNEL__ */
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