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