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/*
* Library implementing the most common irq chip callback functions
*
* Copyright (C) 2011, Thomas Gleixner
*/
#include <linux/io.h>
#include <linux/irq.h>
#include <linux/slab.h>
#include <linux/interrupt.h>
#include <linux/kernel_stat.h>
#include "internals.h"
static inline struct irq_chip_regs *cur_regs(struct irq_data *d)
{
return &container_of(d->chip, struct irq_chip_type, chip)->regs;
}
/**
* irq_gc_noop - NOOP function
* @d: irq_data
*/
void irq_gc_noop(struct irq_data *d)
{
}
/**
* irq_gc_mask_disable_reg - Mask chip via disable register
* @d: irq_data
*
* Chip has separate enable/disable registers instead of a single mask
* register.
*/
void irq_gc_mask_disable_reg(struct irq_data *d)
{
struct irq_chip_generic *gc = irq_data_get_irq_chip_data(d);
u32 mask = 1 << (d->irq - gc->irq_base);
irq_gc_lock(gc);
irq_reg_writel(mask, gc->reg_base + cur_regs(d)->disable);
gc->mask_cache &= ~mask;
irq_gc_unlock(gc);
}
/**
* irq_gc_mask_set_mask_bit - Mask chip via setting bit in mask register
* @d: irq_data
*
* Chip has a single mask register. Values of this register are cached
* and protected by gc->lock
*/
void irq_gc_mask_set_bit(struct irq_data *d)
{
struct irq_chip_generic *gc = irq_data_get_irq_chip_data(d);
u32 mask = 1 << (d->irq - gc->irq_base);
irq_gc_lock(gc);
gc->mask_cache |= mask;
irq_reg_writel(gc->mask_cache, gc->reg_base + cur_regs(d)->mask);
irq_gc_unlock(gc);
}
/**
* irq_gc_mask_set_mask_bit - Mask chip via clearing bit in mask register
* @d: irq_data
*
* Chip has a single mask register. Values of this register are cached
* and protected by gc->lock
*/
void irq_gc_mask_clr_bit(struct irq_data *d)
{
struct irq_chip_generic *gc = irq_data_get_irq_chip_data(d);
u32 mask = 1 << (d->irq - gc->irq_base);
irq_gc_lock(gc);
gc->mask_cache &= ~mask;
irq_reg_writel(gc->mask_cache, gc->reg_base + cur_regs(d)->mask);
irq_gc_unlock(gc);
}
/**
* irq_gc_unmask_enable_reg - Unmask chip via enable register
* @d: irq_data
*
* Chip has separate enable/disable registers instead of a single mask
* register.
*/
void irq_gc_unmask_enable_reg(struct irq_data *d)
{
struct irq_chip_generic *gc = irq_data_get_irq_chip_data(d);
u32 mask = 1 << (d->irq - gc->irq_base);
irq_gc_lock(gc);
irq_reg_writel(mask, gc->reg_base + cur_regs(d)->enable);
gc->mask_cache |= mask;
irq_gc_unlock(gc);
}
/**
* irq_gc_ack - Ack pending interrupt
* @d: irq_data
*/
void irq_gc_ack(struct irq_data *d)
{
struct irq_chip_generic *gc = irq_data_get_irq_chip_data(d);
u32 mask = 1 << (d->irq - gc->irq_base);
irq_gc_lock(gc);
irq_reg_writel(mask, gc->reg_base + cur_regs(d)->ack);
irq_gc_unlock(gc);
}
/**
* irq_gc_mask_disable_reg_and_ack- Mask and ack pending interrupt
* @d: irq_data
*/
void irq_gc_mask_disable_reg_and_ack(struct irq_data *d)
{
struct irq_chip_generic *gc = irq_data_get_irq_chip_data(d);
u32 mask = 1 << (d->irq - gc->irq_base);
irq_gc_lock(gc);
irq_reg_writel(mask, gc->reg_base + cur_regs(d)->mask);
irq_reg_writel(mask, gc->reg_base + cur_regs(d)->ack);
irq_gc_unlock(gc);
}
/**
* irq_gc_eoi - EOI interrupt
* @d: irq_data
*/
void irq_gc_eoi(struct irq_data *d)
{
struct irq_chip_generic *gc = irq_data_get_irq_chip_data(d);
u32 mask = 1 << (d->irq - gc->irq_base);
irq_gc_lock(gc);
irq_reg_writel(mask, gc->reg_base + cur_regs(d)->eoi);
irq_gc_unlock(gc);
}
/**
* irq_gc_set_wake - Set/clr wake bit for an interrupt
* @d: irq_data
*
* For chips where the wake from suspend functionality is not
* configured in a separate register and the wakeup active state is
* just stored in a bitmask.
*/
int irq_gc_set_wake(struct irq_data *d, unsigned int on)
{
struct irq_chip_generic *gc = irq_data_get_irq_chip_data(d);
u32 mask = 1 << (d->irq - gc->irq_base);
if (!(mask & gc->wake_enabled))
return -EINVAL;
irq_gc_lock(gc);
if (on)
gc->wake_active |= mask;
else
gc->wake_active &= ~mask;
irq_gc_unlock(gc);
return 0;
}
/**
* irq_alloc_generic_chip - Allocate a generic chip and initialize it
* @name: Name of the irq chip
* @num_ct: Number of irq_chip_type instances associated with this
* @irq_base: Interrupt base nr for this chip
* @reg_base: Register base address (virtual)
* @handler: Default flow handler associated with this chip
*
* Returns an initialized irq_chip_generic structure. The chip defaults
* to the primary (index 0) irq_chip_type and @handler
*/
struct irq_chip_generic *
irq_alloc_generic_chip(const char *name, int num_ct, unsigned int irq_base,
void __iomem *reg_base, irq_flow_handler_t handler)
{
struct irq_chip_generic *gc;
unsigned long sz = sizeof(*gc) + num_ct * sizeof(struct irq_chip_type);
gc = kzalloc(sz, GFP_KERNEL);
if (gc) {
raw_spin_lock_init(&gc->lock);
gc->num_ct = num_ct;
gc->irq_base = irq_base;
gc->reg_base = reg_base;
gc->chip_types->chip.name = name;
gc->chip_types->handler = handler;
}
return gc;
}
/*
* Separate lockdep class for interrupt chip which can nest irq_desc
* lock.
*/
static struct lock_class_key irq_nested_lock_class;
/**
* irq_setup_generic_chip - Setup a range of interrupts with a generic chip
* @gc: Generic irq chip holding all data
* @msk: Bitmask holding the irqs to initialize relative to gc->irq_base
* @flags: Flags for initialization
* @clr: IRQ_* bits to clear
* @set: IRQ_* bits to set
*
* Set up max. 32 interrupts starting from gc->irq_base. Note, this
* initializes all interrupts to the primary irq_chip_type and its
* associated handler.
*/
void irq_setup_generic_chip(struct irq_chip_generic *gc, u32 msk,
enum irq_gc_flags flags, unsigned int clr,
unsigned int set)
{
struct irq_chip_type *ct = gc->chip_types;
unsigned int i;
/* Init mask cache ? */
if (flags & IRQ_GC_INIT_MASK_CACHE)
gc->mask_cache = irq_reg_readl(gc->reg_base + ct->regs.mask);
for (i = gc->irq_base; msk; msk >>= 1, i++) {
if (!msk & 0x01)
continue;
if (flags & IRQ_GC_INIT_NESTED_LOCK)
irq_set_lockdep_class(i, &irq_nested_lock_class);
irq_set_chip_and_handler(i, &ct->chip, ct->handler);
irq_set_chip_data(i, gc);
irq_modify_status(i, clr, set);
}
gc->irq_cnt = i - gc->irq_base;
}
/**
* irq_setup_alt_chip - Switch to alternative chip
* @d: irq_data for this interrupt
* @type Flow type to be initialized
*
* Only to be called from chip->irq_set_type() callbacks.
*/
int irq_setup_alt_chip(struct irq_data *d, unsigned int type)
{
struct irq_chip_generic *gc = irq_data_get_irq_chip_data(d);
struct irq_chip_type *ct = gc->chip_types;
unsigned int i;
for (i = 0; i < gc->num_ct; i++, ct++) {
if (ct->type & type) {
d->chip = &ct->chip;
irq_data_to_desc(d)->handle_irq = ct->handler;
return 0;
}
}
return -EINVAL;
}
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