linux/kernel/irq/generic-chip.c

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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/export.h>
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#include <linux/irqdomain.h>
#include <linux/interrupt.h>
#include <linux/kernel_stat.h>
#include <linux/syscore_ops.h>
#include "internals.h"
static LIST_HEAD(gc_list);
static DEFINE_RAW_SPINLOCK(gc_lock);
/**
* 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);
struct irq_chip_type *ct = irq_data_get_chip_type(d);
u32 mask = d->mask;
irq_gc_lock(gc);
irq_reg_writel(gc, mask, ct->regs.disable);
genirq: Generic chip: Add support for per chip type mask cache Today the same interrupt mask cache (stored within struct irq_chip_generic) is shared between all the irq_chip_type instances. As there are instances where each irq_chip_type uses a distinct mask register (as it is the case for Orion SoCs), sharing a single mask cache may be incorrect. So add a distinct pointer for each irq_chip_type, which for now points to the original mask register within irq_chip_generic. So no functional changes here. [ tglx: Minor cosmetic tweaks ] Reported-by: Joey Oravec <joravec@drewtech.com> Signed-off-by: Simon Guinot <sguinot@lacie.com> Signed-off-by: Holger Brunck <holger.brunck@keymile.com> Signed-off-by: Gerlando Falauto <gerlando.falauto@keymile.com> Cc: Andrew Lunn <andrew@lunn.ch> Cc: Lennert Buytenhek <kernel@wantstofly.org> Cc: Russell King - ARM Linux <linux@arm.linux.org.uk> Cc: Jason Gunthorpe <jgunthorpe@obsidianresearch.com> Cc: Holger Brunck <Holger.Brunck@keymile.com> Cc: Ezequiel Garcia <ezequiel.garcia@free-electrons.com> Acked-by: Grant Likely <grant.likely@linaro.org> Cc: Sebastian Hesselbarth <sebastian.hesselbarth@gmail.com> Cc: Jason Cooper <jason@lakedaemon.net> Cc: Arnd Bergmann <arnd@arndb.de> Cc: devicetree-discuss@lists.ozlabs.org Cc: Rob Herring <rob.herring@calxeda.com> Cc: Ben Dooks <ben-linux@fluff.org> Cc: Gregory Clement <gregory.clement@free-electrons.com> Cc: Simon Guinot <simon@sequanux.org> Cc: linux-arm-kernel@lists.infradead.org Cc: Thomas Petazzoni <thomas.petazzoni@free-electrons.com> Cc: Jean-Francois Moine <moinejf@free.fr> Cc: Nicolas Pitre <nico@fluxnic.net> Cc: Rob Landley <rob@landley.net> Cc: Maxime Ripard <maxime.ripard@free-electrons.com> Link: http://lkml.kernel.org/r/20130506142539.082226607@linutronix.de Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
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*ct->mask_cache &= ~mask;
irq_gc_unlock(gc);
}
/**
* irq_gc_mask_set_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);
struct irq_chip_type *ct = irq_data_get_chip_type(d);
u32 mask = d->mask;
irq_gc_lock(gc);
genirq: Generic chip: Add support for per chip type mask cache Today the same interrupt mask cache (stored within struct irq_chip_generic) is shared between all the irq_chip_type instances. As there are instances where each irq_chip_type uses a distinct mask register (as it is the case for Orion SoCs), sharing a single mask cache may be incorrect. So add a distinct pointer for each irq_chip_type, which for now points to the original mask register within irq_chip_generic. So no functional changes here. [ tglx: Minor cosmetic tweaks ] Reported-by: Joey Oravec <joravec@drewtech.com> Signed-off-by: Simon Guinot <sguinot@lacie.com> Signed-off-by: Holger Brunck <holger.brunck@keymile.com> Signed-off-by: Gerlando Falauto <gerlando.falauto@keymile.com> Cc: Andrew Lunn <andrew@lunn.ch> Cc: Lennert Buytenhek <kernel@wantstofly.org> Cc: Russell King - ARM Linux <linux@arm.linux.org.uk> Cc: Jason Gunthorpe <jgunthorpe@obsidianresearch.com> Cc: Holger Brunck <Holger.Brunck@keymile.com> Cc: Ezequiel Garcia <ezequiel.garcia@free-electrons.com> Acked-by: Grant Likely <grant.likely@linaro.org> Cc: Sebastian Hesselbarth <sebastian.hesselbarth@gmail.com> Cc: Jason Cooper <jason@lakedaemon.net> Cc: Arnd Bergmann <arnd@arndb.de> Cc: devicetree-discuss@lists.ozlabs.org Cc: Rob Herring <rob.herring@calxeda.com> Cc: Ben Dooks <ben-linux@fluff.org> Cc: Gregory Clement <gregory.clement@free-electrons.com> Cc: Simon Guinot <simon@sequanux.org> Cc: linux-arm-kernel@lists.infradead.org Cc: Thomas Petazzoni <thomas.petazzoni@free-electrons.com> Cc: Jean-Francois Moine <moinejf@free.fr> Cc: Nicolas Pitre <nico@fluxnic.net> Cc: Rob Landley <rob@landley.net> Cc: Maxime Ripard <maxime.ripard@free-electrons.com> Link: http://lkml.kernel.org/r/20130506142539.082226607@linutronix.de Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
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*ct->mask_cache |= mask;
irq_reg_writel(gc, *ct->mask_cache, ct->regs.mask);
irq_gc_unlock(gc);
}
EXPORT_SYMBOL_GPL(irq_gc_mask_set_bit);
/**
* irq_gc_mask_clr_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);
struct irq_chip_type *ct = irq_data_get_chip_type(d);
u32 mask = d->mask;
irq_gc_lock(gc);
genirq: Generic chip: Add support for per chip type mask cache Today the same interrupt mask cache (stored within struct irq_chip_generic) is shared between all the irq_chip_type instances. As there are instances where each irq_chip_type uses a distinct mask register (as it is the case for Orion SoCs), sharing a single mask cache may be incorrect. So add a distinct pointer for each irq_chip_type, which for now points to the original mask register within irq_chip_generic. So no functional changes here. [ tglx: Minor cosmetic tweaks ] Reported-by: Joey Oravec <joravec@drewtech.com> Signed-off-by: Simon Guinot <sguinot@lacie.com> Signed-off-by: Holger Brunck <holger.brunck@keymile.com> Signed-off-by: Gerlando Falauto <gerlando.falauto@keymile.com> Cc: Andrew Lunn <andrew@lunn.ch> Cc: Lennert Buytenhek <kernel@wantstofly.org> Cc: Russell King - ARM Linux <linux@arm.linux.org.uk> Cc: Jason Gunthorpe <jgunthorpe@obsidianresearch.com> Cc: Holger Brunck <Holger.Brunck@keymile.com> Cc: Ezequiel Garcia <ezequiel.garcia@free-electrons.com> Acked-by: Grant Likely <grant.likely@linaro.org> Cc: Sebastian Hesselbarth <sebastian.hesselbarth@gmail.com> Cc: Jason Cooper <jason@lakedaemon.net> Cc: Arnd Bergmann <arnd@arndb.de> Cc: devicetree-discuss@lists.ozlabs.org Cc: Rob Herring <rob.herring@calxeda.com> Cc: Ben Dooks <ben-linux@fluff.org> Cc: Gregory Clement <gregory.clement@free-electrons.com> Cc: Simon Guinot <simon@sequanux.org> Cc: linux-arm-kernel@lists.infradead.org Cc: Thomas Petazzoni <thomas.petazzoni@free-electrons.com> Cc: Jean-Francois Moine <moinejf@free.fr> Cc: Nicolas Pitre <nico@fluxnic.net> Cc: Rob Landley <rob@landley.net> Cc: Maxime Ripard <maxime.ripard@free-electrons.com> Link: http://lkml.kernel.org/r/20130506142539.082226607@linutronix.de Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
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*ct->mask_cache &= ~mask;
irq_reg_writel(gc, *ct->mask_cache, ct->regs.mask);
irq_gc_unlock(gc);
}
EXPORT_SYMBOL_GPL(irq_gc_mask_clr_bit);
/**
* 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);
struct irq_chip_type *ct = irq_data_get_chip_type(d);
u32 mask = d->mask;
irq_gc_lock(gc);
irq_reg_writel(gc, mask, ct->regs.enable);
genirq: Generic chip: Add support for per chip type mask cache Today the same interrupt mask cache (stored within struct irq_chip_generic) is shared between all the irq_chip_type instances. As there are instances where each irq_chip_type uses a distinct mask register (as it is the case for Orion SoCs), sharing a single mask cache may be incorrect. So add a distinct pointer for each irq_chip_type, which for now points to the original mask register within irq_chip_generic. So no functional changes here. [ tglx: Minor cosmetic tweaks ] Reported-by: Joey Oravec <joravec@drewtech.com> Signed-off-by: Simon Guinot <sguinot@lacie.com> Signed-off-by: Holger Brunck <holger.brunck@keymile.com> Signed-off-by: Gerlando Falauto <gerlando.falauto@keymile.com> Cc: Andrew Lunn <andrew@lunn.ch> Cc: Lennert Buytenhek <kernel@wantstofly.org> Cc: Russell King - ARM Linux <linux@arm.linux.org.uk> Cc: Jason Gunthorpe <jgunthorpe@obsidianresearch.com> Cc: Holger Brunck <Holger.Brunck@keymile.com> Cc: Ezequiel Garcia <ezequiel.garcia@free-electrons.com> Acked-by: Grant Likely <grant.likely@linaro.org> Cc: Sebastian Hesselbarth <sebastian.hesselbarth@gmail.com> Cc: Jason Cooper <jason@lakedaemon.net> Cc: Arnd Bergmann <arnd@arndb.de> Cc: devicetree-discuss@lists.ozlabs.org Cc: Rob Herring <rob.herring@calxeda.com> Cc: Ben Dooks <ben-linux@fluff.org> Cc: Gregory Clement <gregory.clement@free-electrons.com> Cc: Simon Guinot <simon@sequanux.org> Cc: linux-arm-kernel@lists.infradead.org Cc: Thomas Petazzoni <thomas.petazzoni@free-electrons.com> Cc: Jean-Francois Moine <moinejf@free.fr> Cc: Nicolas Pitre <nico@fluxnic.net> Cc: Rob Landley <rob@landley.net> Cc: Maxime Ripard <maxime.ripard@free-electrons.com> Link: http://lkml.kernel.org/r/20130506142539.082226607@linutronix.de Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
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*ct->mask_cache |= mask;
irq_gc_unlock(gc);
}
/**
* irq_gc_ack_set_bit - Ack pending interrupt via setting bit
* @d: irq_data
*/
void irq_gc_ack_set_bit(struct irq_data *d)
{
struct irq_chip_generic *gc = irq_data_get_irq_chip_data(d);
struct irq_chip_type *ct = irq_data_get_chip_type(d);
u32 mask = d->mask;
irq_gc_lock(gc);
irq_reg_writel(gc, mask, ct->regs.ack);
irq_gc_unlock(gc);
}
EXPORT_SYMBOL_GPL(irq_gc_ack_set_bit);
/**
* irq_gc_ack_clr_bit - Ack pending interrupt via clearing bit
* @d: irq_data
*/
void irq_gc_ack_clr_bit(struct irq_data *d)
{
struct irq_chip_generic *gc = irq_data_get_irq_chip_data(d);
struct irq_chip_type *ct = irq_data_get_chip_type(d);
u32 mask = ~d->mask;
irq_gc_lock(gc);
irq_reg_writel(gc, mask, ct->regs.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);
struct irq_chip_type *ct = irq_data_get_chip_type(d);
u32 mask = d->mask;
irq_gc_lock(gc);
irq_reg_writel(gc, mask, ct->regs.mask);
irq_reg_writel(gc, mask, ct->regs.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);
struct irq_chip_type *ct = irq_data_get_chip_type(d);
u32 mask = d->mask;
irq_gc_lock(gc);
irq_reg_writel(gc, mask, ct->regs.eoi);
irq_gc_unlock(gc);
}
/**
* irq_gc_set_wake - Set/clr wake bit for an interrupt
* @d: irq_data
* @on: Indicates whether the wake bit should be set or cleared
*
* 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 = d->mask;
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;
}
static u32 irq_readl_be(void __iomem *addr)
{
return ioread32be(addr);
}
static void irq_writel_be(u32 val, void __iomem *addr)
{
iowrite32be(val, addr);
}
void irq_init_generic_chip(struct irq_chip_generic *gc, const char *name,
int num_ct, unsigned int irq_base,
void __iomem *reg_base, irq_flow_handler_t handler)
{
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;
}
/**
* 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) {
irq_init_generic_chip(gc, name, num_ct, irq_base, reg_base,
handler);
}
return gc;
}
EXPORT_SYMBOL_GPL(irq_alloc_generic_chip);
static void
irq_gc_init_mask_cache(struct irq_chip_generic *gc, enum irq_gc_flags flags)
{
struct irq_chip_type *ct = gc->chip_types;
u32 *mskptr = &gc->mask_cache, mskreg = ct->regs.mask;
int i;
for (i = 0; i < gc->num_ct; i++) {
if (flags & IRQ_GC_MASK_CACHE_PER_TYPE) {
mskptr = &ct[i].mask_cache_priv;
mskreg = ct[i].regs.mask;
}
ct[i].mask_cache = mskptr;
if (flags & IRQ_GC_INIT_MASK_CACHE)
*mskptr = irq_reg_readl(gc, mskreg);
}
}
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/**
* __irq_alloc_domain_generic_chip - Allocate generic chips for an irq domain
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* @d: irq domain for which to allocate chips
* @irqs_per_chip: Number of interrupts each chip handles (max 32)
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* @num_ct: Number of irq_chip_type instances associated with this
* @name: Name of the irq chip
* @handler: Default flow handler associated with these chips
* @clr: IRQ_* bits to clear in the mapping function
* @set: IRQ_* bits to set in the mapping function
* @gcflags: Generic chip specific setup flags
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*/
int __irq_alloc_domain_generic_chips(struct irq_domain *d, int irqs_per_chip,
int num_ct, const char *name,
irq_flow_handler_t handler,
unsigned int clr, unsigned int set,
enum irq_gc_flags gcflags)
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{
struct irq_domain_chip_generic *dgc;
struct irq_chip_generic *gc;
int numchips, sz, i;
unsigned long flags;
void *tmp;
if (d->gc)
return -EBUSY;
numchips = DIV_ROUND_UP(d->revmap_size, irqs_per_chip);
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if (!numchips)
return -EINVAL;
/* Allocate a pointer, generic chip and chiptypes for each chip */
sz = sizeof(*dgc) + numchips * sizeof(gc);
sz += numchips * (sizeof(*gc) + num_ct * sizeof(struct irq_chip_type));
tmp = dgc = kzalloc(sz, GFP_KERNEL);
if (!dgc)
return -ENOMEM;
dgc->irqs_per_chip = irqs_per_chip;
dgc->num_chips = numchips;
dgc->irq_flags_to_set = set;
dgc->irq_flags_to_clear = clr;
dgc->gc_flags = gcflags;
d->gc = dgc;
/* Calc pointer to the first generic chip */
tmp += sizeof(*dgc) + numchips * sizeof(gc);
for (i = 0; i < numchips; i++) {
/* Store the pointer to the generic chip */
dgc->gc[i] = gc = tmp;
irq_init_generic_chip(gc, name, num_ct, i * irqs_per_chip,
NULL, handler);
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gc->domain = d;
if (gcflags & IRQ_GC_BE_IO) {
gc->reg_readl = &irq_readl_be;
gc->reg_writel = &irq_writel_be;
}
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raw_spin_lock_irqsave(&gc_lock, flags);
list_add_tail(&gc->list, &gc_list);
raw_spin_unlock_irqrestore(&gc_lock, flags);
/* Calc pointer to the next generic chip */
tmp += sizeof(*gc) + num_ct * sizeof(struct irq_chip_type);
}
d->name = name;
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return 0;
}
EXPORT_SYMBOL_GPL(__irq_alloc_domain_generic_chips);
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static struct irq_chip_generic *
__irq_get_domain_generic_chip(struct irq_domain *d, unsigned int hw_irq)
{
struct irq_domain_chip_generic *dgc = d->gc;
int idx;
if (!dgc)
return ERR_PTR(-ENODEV);
idx = hw_irq / dgc->irqs_per_chip;
if (idx >= dgc->num_chips)
return ERR_PTR(-EINVAL);
return dgc->gc[idx];
}
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/**
* irq_get_domain_generic_chip - Get a pointer to the generic chip of a hw_irq
* @d: irq domain pointer
* @hw_irq: Hardware interrupt number
*/
struct irq_chip_generic *
irq_get_domain_generic_chip(struct irq_domain *d, unsigned int hw_irq)
{
struct irq_chip_generic *gc = __irq_get_domain_generic_chip(d, hw_irq);
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return !IS_ERR(gc) ? gc : NULL;
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}
EXPORT_SYMBOL_GPL(irq_get_domain_generic_chip);
/*
* Separate lockdep class for interrupt chip which can nest irq_desc
* lock.
*/
static struct lock_class_key irq_nested_lock_class;
/*
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* irq_map_generic_chip - Map a generic chip for an irq domain
*/
int irq_map_generic_chip(struct irq_domain *d, unsigned int virq,
irq_hw_number_t hw_irq)
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{
struct irq_data *data = irq_domain_get_irq_data(d, virq);
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struct irq_domain_chip_generic *dgc = d->gc;
struct irq_chip_generic *gc;
struct irq_chip_type *ct;
struct irq_chip *chip;
unsigned long flags;
int idx;
gc = __irq_get_domain_generic_chip(d, hw_irq);
if (IS_ERR(gc))
return PTR_ERR(gc);
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idx = hw_irq % dgc->irqs_per_chip;
if (test_bit(idx, &gc->unused))
return -ENOTSUPP;
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if (test_bit(idx, &gc->installed))
return -EBUSY;
ct = gc->chip_types;
chip = &ct->chip;
/* We only init the cache for the first mapping of a generic chip */
if (!gc->installed) {
raw_spin_lock_irqsave(&gc->lock, flags);
irq_gc_init_mask_cache(gc, dgc->gc_flags);
raw_spin_unlock_irqrestore(&gc->lock, flags);
}
/* Mark the interrupt as installed */
set_bit(idx, &gc->installed);
if (dgc->gc_flags & IRQ_GC_INIT_NESTED_LOCK)
irq_set_lockdep_class(virq, &irq_nested_lock_class);
if (chip->irq_calc_mask)
chip->irq_calc_mask(data);
else
data->mask = 1 << idx;
irq_domain_set_info(d, virq, hw_irq, chip, gc, ct->handler, NULL, NULL);
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irq_modify_status(virq, dgc->irq_flags_to_clear, dgc->irq_flags_to_set);
return 0;
}
static void irq_unmap_generic_chip(struct irq_domain *d, unsigned int virq)
{
struct irq_data *data = irq_domain_get_irq_data(d, virq);
struct irq_domain_chip_generic *dgc = d->gc;
unsigned int hw_irq = data->hwirq;
struct irq_chip_generic *gc;
int irq_idx;
gc = irq_get_domain_generic_chip(d, hw_irq);
if (!gc)
return;
irq_idx = hw_irq % dgc->irqs_per_chip;
clear_bit(irq_idx, &gc->installed);
irq_domain_set_info(d, virq, hw_irq, &no_irq_chip, NULL, NULL, NULL,
NULL);
}
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struct irq_domain_ops irq_generic_chip_ops = {
.map = irq_map_generic_chip,
.unmap = irq_unmap_generic_chip,
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.xlate = irq_domain_xlate_onetwocell,
};
EXPORT_SYMBOL_GPL(irq_generic_chip_ops);
/**
* 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;
struct irq_chip *chip = &ct->chip;
unsigned int i;
raw_spin_lock(&gc_lock);
list_add_tail(&gc->list, &gc_list);
raw_spin_unlock(&gc_lock);
irq_gc_init_mask_cache(gc, flags);
genirq: Generic chip: Add support for per chip type mask cache Today the same interrupt mask cache (stored within struct irq_chip_generic) is shared between all the irq_chip_type instances. As there are instances where each irq_chip_type uses a distinct mask register (as it is the case for Orion SoCs), sharing a single mask cache may be incorrect. So add a distinct pointer for each irq_chip_type, which for now points to the original mask register within irq_chip_generic. So no functional changes here. [ tglx: Minor cosmetic tweaks ] Reported-by: Joey Oravec <joravec@drewtech.com> Signed-off-by: Simon Guinot <sguinot@lacie.com> Signed-off-by: Holger Brunck <holger.brunck@keymile.com> Signed-off-by: Gerlando Falauto <gerlando.falauto@keymile.com> Cc: Andrew Lunn <andrew@lunn.ch> Cc: Lennert Buytenhek <kernel@wantstofly.org> Cc: Russell King - ARM Linux <linux@arm.linux.org.uk> Cc: Jason Gunthorpe <jgunthorpe@obsidianresearch.com> Cc: Holger Brunck <Holger.Brunck@keymile.com> Cc: Ezequiel Garcia <ezequiel.garcia@free-electrons.com> Acked-by: Grant Likely <grant.likely@linaro.org> Cc: Sebastian Hesselbarth <sebastian.hesselbarth@gmail.com> Cc: Jason Cooper <jason@lakedaemon.net> Cc: Arnd Bergmann <arnd@arndb.de> Cc: devicetree-discuss@lists.ozlabs.org Cc: Rob Herring <rob.herring@calxeda.com> Cc: Ben Dooks <ben-linux@fluff.org> Cc: Gregory Clement <gregory.clement@free-electrons.com> Cc: Simon Guinot <simon@sequanux.org> Cc: linux-arm-kernel@lists.infradead.org Cc: Thomas Petazzoni <thomas.petazzoni@free-electrons.com> Cc: Jean-Francois Moine <moinejf@free.fr> Cc: Nicolas Pitre <nico@fluxnic.net> Cc: Rob Landley <rob@landley.net> Cc: Maxime Ripard <maxime.ripard@free-electrons.com> Link: http://lkml.kernel.org/r/20130506142539.082226607@linutronix.de Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
2013-05-06 14:30:19 +00:00
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);
if (!(flags & IRQ_GC_NO_MASK)) {
struct irq_data *d = irq_get_irq_data(i);
if (chip->irq_calc_mask)
chip->irq_calc_mask(d);
else
d->mask = 1 << (i - gc->irq_base);
}
irq_set_chip_and_handler(i, chip, ct->handler);
irq_set_chip_data(i, gc);
irq_modify_status(i, clr, set);
}
gc->irq_cnt = i - gc->irq_base;
}
EXPORT_SYMBOL_GPL(irq_setup_generic_chip);
/**
* 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;
}
EXPORT_SYMBOL_GPL(irq_setup_alt_chip);
/**
* irq_remove_generic_chip - Remove a chip
* @gc: Generic irq chip holding all data
* @msk: Bitmask holding the irqs to initialize relative to gc->irq_base
* @clr: IRQ_* bits to clear
* @set: IRQ_* bits to set
*
* Remove up to 32 interrupts starting from gc->irq_base.
*/
void irq_remove_generic_chip(struct irq_chip_generic *gc, u32 msk,
unsigned int clr, unsigned int set)
{
unsigned int i = gc->irq_base;
raw_spin_lock(&gc_lock);
list_del(&gc->list);
raw_spin_unlock(&gc_lock);
for (; msk; msk >>= 1, i++) {
if (!(msk & 0x01))
continue;
/* Remove handler first. That will mask the irq line */
irq_set_handler(i, NULL);
irq_set_chip(i, &no_irq_chip);
irq_set_chip_data(i, NULL);
irq_modify_status(i, clr, set);
}
}
EXPORT_SYMBOL_GPL(irq_remove_generic_chip);
2013-05-06 14:30:27 +00:00
static struct irq_data *irq_gc_get_irq_data(struct irq_chip_generic *gc)
{
unsigned int virq;
if (!gc->domain)
return irq_get_irq_data(gc->irq_base);
/*
* We don't know which of the irqs has been actually
* installed. Use the first one.
*/
if (!gc->installed)
return NULL;
virq = irq_find_mapping(gc->domain, gc->irq_base + __ffs(gc->installed));
return virq ? irq_get_irq_data(virq) : NULL;
}
#ifdef CONFIG_PM
static int irq_gc_suspend(void)
{
struct irq_chip_generic *gc;
list_for_each_entry(gc, &gc_list, list) {
struct irq_chip_type *ct = gc->chip_types;
2013-05-06 14:30:27 +00:00
if (ct->chip.irq_suspend) {
struct irq_data *data = irq_gc_get_irq_data(gc);
if (data)
ct->chip.irq_suspend(data);
}
genirq: Add chip_[suspend|resume] PM support to irq_chip Some (admittedly odd) irqchips perform functions that are not directly related to any of their child IRQ lines, and therefore need to perform some tasks during suspend/resume regardless of whether there are any "installed" interrupts for the irqchip. However, the current generic-chip framework does not call the chip's irq_{suspend,resume} when there are no interrupts installed (this makes sense, because there are no irq_data objects for such a call to be made). More specifically, irq-bcm7120-l2 configures both a forwarding mask (which affects other top-level GIC IRQs) and a second-level interrupt mask (for managing its own child interrupts). The former must be saved/restored on suspend/resume, even when there's nothing to do for the latter. This patch adds a new set of suspend/resume hooks to irq_chip_generic, to help represent *chip* suspend/resume, rather than IRQ suspend/resume. These callbacks will always be called for an IRQ chip (regardless of the installed interrupts) and are based on the per-chip irq_chip_generic struct, rather than the per-IRQ irq_data struct. The original problem report is described in extra detail here: http://lkml.kernel.org/g/20150619224123.GL4917@ld-irv-0074 Signed-off-by: Brian Norris <computersforpeace@gmail.com> Tested-by: Florian Fainelli <f.fainelli@gmail.com> Cc: Gregory Fong <gregory.0xf0@gmail.com> Cc: bcm-kernel-feedback-list@broadcom.com Cc: linux-mips@linux-mips.org Cc: Kevin Cernekee <cernekee@chromium.org> Cc: Jason Cooper <jason@lakedaemon.net> Link: http://lkml.kernel.org/r/1437607300-40858-1-git-send-email-computersforpeace@gmail.com Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
2015-07-22 23:21:39 +00:00
if (gc->suspend)
gc->suspend(gc);
}
return 0;
}
static void irq_gc_resume(void)
{
struct irq_chip_generic *gc;
list_for_each_entry(gc, &gc_list, list) {
struct irq_chip_type *ct = gc->chip_types;
genirq: Add chip_[suspend|resume] PM support to irq_chip Some (admittedly odd) irqchips perform functions that are not directly related to any of their child IRQ lines, and therefore need to perform some tasks during suspend/resume regardless of whether there are any "installed" interrupts for the irqchip. However, the current generic-chip framework does not call the chip's irq_{suspend,resume} when there are no interrupts installed (this makes sense, because there are no irq_data objects for such a call to be made). More specifically, irq-bcm7120-l2 configures both a forwarding mask (which affects other top-level GIC IRQs) and a second-level interrupt mask (for managing its own child interrupts). The former must be saved/restored on suspend/resume, even when there's nothing to do for the latter. This patch adds a new set of suspend/resume hooks to irq_chip_generic, to help represent *chip* suspend/resume, rather than IRQ suspend/resume. These callbacks will always be called for an IRQ chip (regardless of the installed interrupts) and are based on the per-chip irq_chip_generic struct, rather than the per-IRQ irq_data struct. The original problem report is described in extra detail here: http://lkml.kernel.org/g/20150619224123.GL4917@ld-irv-0074 Signed-off-by: Brian Norris <computersforpeace@gmail.com> Tested-by: Florian Fainelli <f.fainelli@gmail.com> Cc: Gregory Fong <gregory.0xf0@gmail.com> Cc: bcm-kernel-feedback-list@broadcom.com Cc: linux-mips@linux-mips.org Cc: Kevin Cernekee <cernekee@chromium.org> Cc: Jason Cooper <jason@lakedaemon.net> Link: http://lkml.kernel.org/r/1437607300-40858-1-git-send-email-computersforpeace@gmail.com Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
2015-07-22 23:21:39 +00:00
if (gc->resume)
gc->resume(gc);
2013-05-06 14:30:27 +00:00
if (ct->chip.irq_resume) {
struct irq_data *data = irq_gc_get_irq_data(gc);
if (data)
ct->chip.irq_resume(data);
}
}
}
#else
#define irq_gc_suspend NULL
#define irq_gc_resume NULL
#endif
static void irq_gc_shutdown(void)
{
struct irq_chip_generic *gc;
list_for_each_entry(gc, &gc_list, list) {
struct irq_chip_type *ct = gc->chip_types;
2013-05-06 14:30:27 +00:00
if (ct->chip.irq_pm_shutdown) {
struct irq_data *data = irq_gc_get_irq_data(gc);
if (data)
ct->chip.irq_pm_shutdown(data);
}
}
}
static struct syscore_ops irq_gc_syscore_ops = {
.suspend = irq_gc_suspend,
.resume = irq_gc_resume,
.shutdown = irq_gc_shutdown,
};
static int __init irq_gc_init_ops(void)
{
register_syscore_ops(&irq_gc_syscore_ops);
return 0;
}
device_initcall(irq_gc_init_ops);