425 lines
13 KiB
C
425 lines
13 KiB
C
#ifndef _LINUX_IRQ_H
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#define _LINUX_IRQ_H
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/*
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* Please do not include this file in generic code. There is currently
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* no requirement for any architecture to implement anything held
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* within this file.
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*
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* Thanks. --rmk
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*/
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#include <linux/smp.h>
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#ifndef CONFIG_S390
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#include <linux/linkage.h>
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#include <linux/cache.h>
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#include <linux/spinlock.h>
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#include <linux/cpumask.h>
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#include <linux/gfp.h>
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#include <linux/irqreturn.h>
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#include <linux/irqnr.h>
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#include <linux/errno.h>
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#include <linux/topology.h>
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#include <linux/wait.h>
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#include <asm/irq.h>
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#include <asm/ptrace.h>
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#include <asm/irq_regs.h>
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struct irq_desc;
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typedef void (*irq_flow_handler_t)(unsigned int irq,
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struct irq_desc *desc);
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/*
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* IRQ line status.
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*
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* Bits 0-7 are reserved for the IRQF_* bits in linux/interrupt.h
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*
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* IRQ types
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*/
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#define IRQ_TYPE_NONE 0x00000000 /* Default, unspecified type */
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#define IRQ_TYPE_EDGE_RISING 0x00000001 /* Edge rising type */
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#define IRQ_TYPE_EDGE_FALLING 0x00000002 /* Edge falling type */
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#define IRQ_TYPE_EDGE_BOTH (IRQ_TYPE_EDGE_FALLING | IRQ_TYPE_EDGE_RISING)
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#define IRQ_TYPE_LEVEL_HIGH 0x00000004 /* Level high type */
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#define IRQ_TYPE_LEVEL_LOW 0x00000008 /* Level low type */
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#define IRQ_TYPE_SENSE_MASK 0x0000000f /* Mask of the above */
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#define IRQ_TYPE_PROBE 0x00000010 /* Probing in progress */
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/* Internal flags */
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#define IRQ_INPROGRESS 0x00000100 /* IRQ handler active - do not enter! */
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#define IRQ_DISABLED 0x00000200 /* IRQ disabled - do not enter! */
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#define IRQ_PENDING 0x00000400 /* IRQ pending - replay on enable */
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#define IRQ_REPLAY 0x00000800 /* IRQ has been replayed but not acked yet */
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#define IRQ_AUTODETECT 0x00001000 /* IRQ is being autodetected */
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#define IRQ_WAITING 0x00002000 /* IRQ not yet seen - for autodetection */
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#define IRQ_LEVEL 0x00004000 /* IRQ level triggered */
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#define IRQ_MASKED 0x00008000 /* IRQ masked - shouldn't be seen again */
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#define IRQ_PER_CPU 0x00010000 /* IRQ is per CPU */
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#define IRQ_NOPROBE 0x00020000 /* IRQ is not valid for probing */
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#define IRQ_NOREQUEST 0x00040000 /* IRQ cannot be requested */
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#define IRQ_NOAUTOEN 0x00080000 /* IRQ will not be enabled on request irq */
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#define IRQ_WAKEUP 0x00100000 /* IRQ triggers system wakeup */
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#define IRQ_MOVE_PENDING 0x00200000 /* need to re-target IRQ destination */
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#define IRQ_NO_BALANCING 0x00400000 /* IRQ is excluded from balancing */
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#define IRQ_SPURIOUS_DISABLED 0x00800000 /* IRQ was disabled by the spurious trap */
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#define IRQ_MOVE_PCNTXT 0x01000000 /* IRQ migration from process context */
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#define IRQ_AFFINITY_SET 0x02000000 /* IRQ affinity was set from userspace*/
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#define IRQ_SUSPENDED 0x04000000 /* IRQ has gone through suspend sequence */
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#define IRQ_ONESHOT 0x08000000 /* IRQ is not unmasked after hardirq */
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#define IRQ_NESTED_THREAD 0x10000000 /* IRQ is nested into another, no own handler thread */
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#define IRQF_MODIFY_MASK \
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(IRQ_TYPE_SENSE_MASK | IRQ_NOPROBE | IRQ_NOREQUEST | \
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IRQ_NOAUTOEN | IRQ_MOVE_PCNTXT | IRQ_LEVEL)
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#ifdef CONFIG_IRQ_PER_CPU
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# define CHECK_IRQ_PER_CPU(var) ((var) & IRQ_PER_CPU)
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# define IRQ_NO_BALANCING_MASK (IRQ_PER_CPU | IRQ_NO_BALANCING)
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#else
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# define CHECK_IRQ_PER_CPU(var) 0
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# define IRQ_NO_BALANCING_MASK IRQ_NO_BALANCING
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#endif
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struct msi_desc;
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/**
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* struct irq_data - per irq and irq chip data passed down to chip functions
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* @irq: interrupt number
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* @node: node index useful for balancing
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* @chip: low level interrupt hardware access
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* @handler_data: per-IRQ data for the irq_chip methods
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* @chip_data: platform-specific per-chip private data for the chip
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* methods, to allow shared chip implementations
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* @msi_desc: MSI descriptor
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* @affinity: IRQ affinity on SMP
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*
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* The fields here need to overlay the ones in irq_desc until we
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* cleaned up the direct references and switched everything over to
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* irq_data.
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*/
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struct irq_data {
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unsigned int irq;
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unsigned int node;
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struct irq_chip *chip;
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void *handler_data;
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void *chip_data;
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struct msi_desc *msi_desc;
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#ifdef CONFIG_SMP
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cpumask_var_t affinity;
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#endif
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};
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/**
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* struct irq_chip - hardware interrupt chip descriptor
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*
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* @name: name for /proc/interrupts
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* @startup: deprecated, replaced by irq_startup
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* @shutdown: deprecated, replaced by irq_shutdown
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* @enable: deprecated, replaced by irq_enable
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* @disable: deprecated, replaced by irq_disable
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* @ack: deprecated, replaced by irq_ack
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* @mask: deprecated, replaced by irq_mask
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* @mask_ack: deprecated, replaced by irq_mask_ack
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* @unmask: deprecated, replaced by irq_unmask
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* @eoi: deprecated, replaced by irq_eoi
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* @end: deprecated, will go away with __do_IRQ()
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* @set_affinity: deprecated, replaced by irq_set_affinity
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* @retrigger: deprecated, replaced by irq_retrigger
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* @set_type: deprecated, replaced by irq_set_type
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* @set_wake: deprecated, replaced by irq_wake
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* @bus_lock: deprecated, replaced by irq_bus_lock
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* @bus_sync_unlock: deprecated, replaced by irq_bus_sync_unlock
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*
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* @irq_startup: start up the interrupt (defaults to ->enable if NULL)
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* @irq_shutdown: shut down the interrupt (defaults to ->disable if NULL)
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* @irq_enable: enable the interrupt (defaults to chip->unmask if NULL)
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* @irq_disable: disable the interrupt
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* @irq_ack: start of a new interrupt
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* @irq_mask: mask an interrupt source
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* @irq_mask_ack: ack and mask an interrupt source
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* @irq_unmask: unmask an interrupt source
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* @irq_eoi: end of interrupt
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* @irq_set_affinity: set the CPU affinity on SMP machines
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* @irq_retrigger: resend an IRQ to the CPU
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* @irq_set_type: set the flow type (IRQ_TYPE_LEVEL/etc.) of an IRQ
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* @irq_set_wake: enable/disable power-management wake-on of an IRQ
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* @irq_bus_lock: function to lock access to slow bus (i2c) chips
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* @irq_bus_sync_unlock:function to sync and unlock slow bus (i2c) chips
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*
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* @release: release function solely used by UML
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*/
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struct irq_chip {
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const char *name;
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#ifndef CONFIG_GENERIC_HARDIRQS_NO_DEPRECATED
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unsigned int (*startup)(unsigned int irq);
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void (*shutdown)(unsigned int irq);
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void (*enable)(unsigned int irq);
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void (*disable)(unsigned int irq);
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void (*ack)(unsigned int irq);
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void (*mask)(unsigned int irq);
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void (*mask_ack)(unsigned int irq);
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void (*unmask)(unsigned int irq);
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void (*eoi)(unsigned int irq);
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void (*end)(unsigned int irq);
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int (*set_affinity)(unsigned int irq,
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const struct cpumask *dest);
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int (*retrigger)(unsigned int irq);
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int (*set_type)(unsigned int irq, unsigned int flow_type);
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int (*set_wake)(unsigned int irq, unsigned int on);
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void (*bus_lock)(unsigned int irq);
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void (*bus_sync_unlock)(unsigned int irq);
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#endif
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unsigned int (*irq_startup)(struct irq_data *data);
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void (*irq_shutdown)(struct irq_data *data);
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void (*irq_enable)(struct irq_data *data);
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void (*irq_disable)(struct irq_data *data);
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void (*irq_ack)(struct irq_data *data);
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void (*irq_mask)(struct irq_data *data);
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void (*irq_mask_ack)(struct irq_data *data);
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void (*irq_unmask)(struct irq_data *data);
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void (*irq_eoi)(struct irq_data *data);
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int (*irq_set_affinity)(struct irq_data *data, const struct cpumask *dest, bool force);
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int (*irq_retrigger)(struct irq_data *data);
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int (*irq_set_type)(struct irq_data *data, unsigned int flow_type);
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int (*irq_set_wake)(struct irq_data *data, unsigned int on);
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void (*irq_bus_lock)(struct irq_data *data);
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void (*irq_bus_sync_unlock)(struct irq_data *data);
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/* Currently used only by UML, might disappear one day.*/
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#ifdef CONFIG_IRQ_RELEASE_METHOD
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void (*release)(unsigned int irq, void *dev_id);
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#endif
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};
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/* This include will go away once we isolated irq_desc usage to core code */
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#include <linux/irqdesc.h>
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/*
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* Pick up the arch-dependent methods:
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*/
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#include <asm/hw_irq.h>
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#ifndef NR_IRQS_LEGACY
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# define NR_IRQS_LEGACY 0
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#endif
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#ifndef ARCH_IRQ_INIT_FLAGS
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# define ARCH_IRQ_INIT_FLAGS 0
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#endif
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#define IRQ_DEFAULT_INIT_FLAGS (IRQ_DISABLED | ARCH_IRQ_INIT_FLAGS)
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struct irqaction;
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extern int setup_irq(unsigned int irq, struct irqaction *new);
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extern void remove_irq(unsigned int irq, struct irqaction *act);
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#ifdef CONFIG_GENERIC_HARDIRQS
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#if defined(CONFIG_SMP) && defined(CONFIG_GENERIC_PENDING_IRQ)
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void move_native_irq(int irq);
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void move_masked_irq(int irq);
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#else
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static inline void move_native_irq(int irq) { }
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static inline void move_masked_irq(int irq) { }
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#endif
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extern int no_irq_affinity;
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/* Handle irq action chains: */
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extern irqreturn_t handle_IRQ_event(unsigned int irq, struct irqaction *action);
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/*
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* Built-in IRQ handlers for various IRQ types,
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* callable via desc->handle_irq()
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*/
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extern void handle_level_irq(unsigned int irq, struct irq_desc *desc);
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extern void handle_fasteoi_irq(unsigned int irq, struct irq_desc *desc);
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extern void handle_edge_irq(unsigned int irq, struct irq_desc *desc);
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extern void handle_simple_irq(unsigned int irq, struct irq_desc *desc);
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extern void handle_percpu_irq(unsigned int irq, struct irq_desc *desc);
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extern void handle_bad_irq(unsigned int irq, struct irq_desc *desc);
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extern void handle_nested_irq(unsigned int irq);
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/* Handling of unhandled and spurious interrupts: */
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extern void note_interrupt(unsigned int irq, struct irq_desc *desc,
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irqreturn_t action_ret);
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/* Enable/disable irq debugging output: */
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extern int noirqdebug_setup(char *str);
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/* Checks whether the interrupt can be requested by request_irq(): */
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extern int can_request_irq(unsigned int irq, unsigned long irqflags);
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/* Dummy irq-chip implementations: */
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extern struct irq_chip no_irq_chip;
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extern struct irq_chip dummy_irq_chip;
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extern void
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set_irq_chip_and_handler(unsigned int irq, struct irq_chip *chip,
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irq_flow_handler_t handle);
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extern void
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set_irq_chip_and_handler_name(unsigned int irq, struct irq_chip *chip,
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irq_flow_handler_t handle, const char *name);
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extern void
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__set_irq_handler(unsigned int irq, irq_flow_handler_t handle, int is_chained,
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const char *name);
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/*
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* Set a highlevel flow handler for a given IRQ:
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*/
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static inline void
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set_irq_handler(unsigned int irq, irq_flow_handler_t handle)
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{
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__set_irq_handler(irq, handle, 0, NULL);
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}
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/*
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* Set a highlevel chained flow handler for a given IRQ.
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* (a chained handler is automatically enabled and set to
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* IRQ_NOREQUEST and IRQ_NOPROBE)
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*/
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static inline void
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set_irq_chained_handler(unsigned int irq,
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irq_flow_handler_t handle)
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{
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__set_irq_handler(irq, handle, 1, NULL);
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}
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extern void set_irq_nested_thread(unsigned int irq, int nest);
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void irq_modify_status(unsigned int irq, unsigned long clr, unsigned long set);
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static inline void irq_set_status_flags(unsigned int irq, unsigned long set)
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{
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irq_modify_status(irq, 0, set);
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}
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static inline void irq_clear_status_flags(unsigned int irq, unsigned long clr)
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{
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irq_modify_status(irq, clr, 0);
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}
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static inline void set_irq_noprobe(unsigned int irq)
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{
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irq_modify_status(irq, 0, IRQ_NOPROBE);
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}
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static inline void set_irq_probe(unsigned int irq)
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{
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irq_modify_status(irq, IRQ_NOPROBE, 0);
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}
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/* Handle dynamic irq creation and destruction */
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extern unsigned int create_irq_nr(unsigned int irq_want, int node);
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extern int create_irq(void);
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extern void destroy_irq(unsigned int irq);
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/*
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* Dynamic irq helper functions. Obsolete. Use irq_alloc_desc* and
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* irq_free_desc instead.
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*/
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extern void dynamic_irq_cleanup(unsigned int irq);
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static inline void dynamic_irq_init(unsigned int irq)
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{
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dynamic_irq_cleanup(irq);
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}
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/* Set/get chip/data for an IRQ: */
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extern int set_irq_chip(unsigned int irq, struct irq_chip *chip);
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extern int set_irq_data(unsigned int irq, void *data);
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extern int set_irq_chip_data(unsigned int irq, void *data);
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extern int set_irq_type(unsigned int irq, unsigned int type);
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extern int set_irq_msi(unsigned int irq, struct msi_desc *entry);
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extern struct irq_data *irq_get_irq_data(unsigned int irq);
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static inline struct irq_chip *get_irq_chip(unsigned int irq)
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{
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struct irq_data *d = irq_get_irq_data(irq);
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return d ? d->chip : NULL;
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}
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static inline struct irq_chip *irq_data_get_irq_chip(struct irq_data *d)
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{
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return d->chip;
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}
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static inline void *get_irq_chip_data(unsigned int irq)
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{
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struct irq_data *d = irq_get_irq_data(irq);
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return d ? d->chip_data : NULL;
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}
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static inline void *irq_data_get_irq_chip_data(struct irq_data *d)
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{
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return d->chip_data;
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}
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static inline void *get_irq_data(unsigned int irq)
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{
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struct irq_data *d = irq_get_irq_data(irq);
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return d ? d->handler_data : NULL;
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}
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static inline void *irq_data_get_irq_data(struct irq_data *d)
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{
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return d->handler_data;
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}
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static inline struct msi_desc *get_irq_msi(unsigned int irq)
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{
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struct irq_data *d = irq_get_irq_data(irq);
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return d ? d->msi_desc : NULL;
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}
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static inline struct msi_desc *irq_data_get_msi(struct irq_data *d)
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{
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return d->msi_desc;
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}
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int irq_alloc_descs(int irq, unsigned int from, unsigned int cnt, int node);
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void irq_free_descs(unsigned int irq, unsigned int cnt);
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int irq_reserve_irqs(unsigned int from, unsigned int cnt);
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static inline int irq_alloc_desc(int node)
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{
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return irq_alloc_descs(-1, 0, 1, node);
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}
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static inline int irq_alloc_desc_at(unsigned int at, int node)
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{
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return irq_alloc_descs(at, at, 1, node);
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}
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static inline int irq_alloc_desc_from(unsigned int from, int node)
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{
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return irq_alloc_descs(-1, from, 1, node);
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}
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static inline void irq_free_desc(unsigned int irq)
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{
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irq_free_descs(irq, 1);
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}
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static inline int irq_reserve_irq(unsigned int irq)
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{
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return irq_reserve_irqs(irq, 1);
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}
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#endif /* CONFIG_GENERIC_HARDIRQS */
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#endif /* !CONFIG_S390 */
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#endif /* _LINUX_IRQ_H */
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