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genirq: Generic chip: Add linear irq domain support 

Provide infrastructure for irq chip implementations which work on
linear irq domains.

- Interface to allocate multiple generic chips which are associated to
  the irq domain.

- Interface to get the generic chip pointer for a particular hardware
  interrupt in the domain.

- irq domain mapping function to install the chip for a particular
  interrupt.

Note: This lacks a removal function for now.

[ Sebastian Hesselbarth: Mask cache and pointer math fixups ]

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Cc: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
Cc: Andrew Lunn <andrew@lunn.ch>
Cc: Russell King - ARM Linux <linux@arm.linux.org.uk>
Cc: Jason Cooper <jason@lakedaemon.net>
Cc: Arnd Bergmann <arnd@arndb.de>
Cc: Jean-Francois Moine <moinejf@free.fr>
Cc: devicetree-discuss@lists.ozlabs.org
Cc: Rob Herring <rob.herring@calxeda.com>
Cc: Jason Gunthorpe <jgunthorpe@obsidianresearch.com>
Cc: Gregory Clement <gregory.clement@free-electrons.com>
Cc: Gerlando Falauto <gerlando.falauto@keymile.com>
Cc: Rob Landley <rob@landley.net>
Acked-by: Grant Likely <grant.likely@linaro.org>
Cc: Maxime Ripard <maxime.ripard@free-electrons.com>
Cc: Ezequiel Garcia <ezequiel.garcia@free-electrons.com>
Cc: linux-arm-kernel@lists.infradead.org
Cc: Sebastian Hesselbarth <sebastian.hesselbarth@gmail.com>
Link: http://lkml.kernel.org/r/20130506142539.450634298@linutronix.de
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
This commit is contained in:
Thomas Gleixner 2013-05-06 14:30:27 +00:00
parent 3528d82b68
commit 088f40b7b0
4 changed files with 223 additions and 12 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

30
include/linux/irq.h
View File

@ -678,6 +678,8 @@ struct irq_chip_type {
* @wake_active: Interrupt is marked as an wakeup from suspend source
* @num_ct: Number of available irq_chip_type instances (usually 1)
* @private: Private data for non generic chip callbacks
* @installed: bitfield to denote installed interrupts
* @domain: irq domain pointer
* @list: List head for keeping track of instances
* @chip_types: Array of interrupt irq_chip_types
*
@ -699,6 +701,8 @@ struct irq_chip_generic {
u32 wake_active;
unsigned int num_ct;
void *private;
unsigned long installed;
struct irq_domain *domain;
struct list_head list;
struct irq_chip_type chip_types[0];
};
@ -719,6 +723,24 @@ enum irq_gc_flags {
IRQ_GC_NO_MASK = 1 << 3,
};
/*
* struct irq_domain_chip_generic - Generic irq chip data structure for irq domains
* @irqs_per_chip: Number of interrupts per chip
* @num_chips: Number of chips
* @irq_flags_to_set: IRQ* flags to set on irq setup
* @irq_flags_to_clear: IRQ* flags to clear on irq setup
* @gc_flags: Generic chip specific setup flags
* @gc: Array of pointers to generic interrupt chips
*/
struct irq_domain_chip_generic {
unsigned int irqs_per_chip;
unsigned int num_chips;
unsigned int irq_flags_to_clear;
unsigned int irq_flags_to_set;
enum irq_gc_flags gc_flags;
struct irq_chip_generic *gc[0];
};
/* Generic chip callback functions */
void irq_gc_noop(struct irq_data *d);
void irq_gc_mask_disable_reg(struct irq_data *d);
@ -742,6 +764,14 @@ int irq_setup_alt_chip(struct irq_data *d, unsigned int type);
void irq_remove_generic_chip(struct irq_chip_generic *gc, u32 msk,
unsigned int clr, unsigned int set);
struct irq_chip_generic *irq_get_domain_generic_chip(struct irq_domain *d, unsigned int hw_irq);
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 flags);
static inline struct irq_chip_type *irq_data_get_chip_type(struct irq_data *d)
{
return container_of(d->chip, struct irq_chip_type, chip);

12
include/linux/irqdomain.h
View File

@ -66,6 +66,10 @@ struct irq_domain_ops {
unsigned long *out_hwirq, unsigned int *out_type);
};
extern struct irq_domain_ops irq_generic_chip_ops;
struct irq_domain_chip_generic;
/**
* struct irq_domain - Hardware interrupt number translation object
* @link: Element in global irq_domain list.
@ -109,8 +113,16 @@ struct irq_domain {
/* Optional device node pointer */
struct device_node *of_node;
/* Optional pointer to generic interrupt chips */
struct irq_domain_chip_generic *gc;
};
#define IRQ_DOMAIN_MAP_LEGACY 0 /* driver allocated fixed range of irqs.
* ie. legacy 8259, gets irqs 1..15 */
#define IRQ_DOMAIN_MAP_NOMAP 1 /* no fast reverse mapping */
#define IRQ_DOMAIN_MAP_LINEAR 2 /* linear map of interrupts */
#define IRQ_DOMAIN_MAP_TREE 3 /* radix tree */
#ifdef CONFIG_IRQ_DOMAIN
struct irq_domain *irq_domain_add_simple(struct device_node *of_node,
unsigned int size,

187
kernel/irq/generic-chip.c
View File

@ -7,6 +7,7 @@
#include <linux/irq.h>
#include <linux/slab.h>
#include <linux/export.h>
#include <linux/irqdomain.h>
#include <linux/interrupt.h>
#include <linux/kernel_stat.h>
#include <linux/syscore_ops.h>
@ -244,12 +245,156 @@ irq_gc_init_mask_cache(struct irq_chip_generic *gc, enum irq_gc_flags flags)
}
}
/**
* irq_alloc_domain_generic_chip - Allocate generic chips for an irq domain
* @d: irq domain for which to allocate chips
* @irqs_per_chip: Number of interrupts each chip handles
* @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
*/
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)
{
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;
if (d->revmap_type != IRQ_DOMAIN_MAP_LINEAR)
return -EINVAL;
numchips = d->revmap_data.linear.size / irqs_per_chip;
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);
gc->domain = d;
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);
}
return 0;
}
EXPORT_SYMBOL_GPL(irq_alloc_domain_generic_chips);
/**
* 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_domain_chip_generic *dgc = d->gc;
int idx;
if (!dgc)
return NULL;
idx = hw_irq / dgc->irqs_per_chip;
if (idx >= dgc->num_chips)
return NULL;
return dgc->gc[idx];
}
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;
/**
* irq_map_generic_chip - Map a generic chip for an irq domain
*/
static int irq_map_generic_chip(struct irq_domain *d, unsigned int virq,
irq_hw_number_t hw_irq)
{
struct irq_data *data = irq_get_irq_data(virq);
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;
if (!d->gc)
return -ENODEV;
idx = hw_irq / dgc->irqs_per_chip;
if (idx >= dgc->num_chips)
return -EINVAL;
gc = dgc->gc[idx];
idx = hw_irq % dgc->irqs_per_chip;
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_set_chip_and_handler(virq, chip, ct->handler);
irq_set_chip_data(virq, gc);
irq_modify_status(virq, dgc->irq_flags_to_clear, dgc->irq_flags_to_set);
return 0;
}
struct irq_domain_ops irq_generic_chip_ops = {
.map = irq_map_generic_chip,
.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
@ -354,6 +499,24 @@ void irq_remove_generic_chip(struct irq_chip_generic *gc, u32 msk,
}
EXPORT_SYMBOL_GPL(irq_remove_generic_chip);
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)
{
@ -362,8 +525,12 @@ static int irq_gc_suspend(void)
list_for_each_entry(gc, &gc_list, list) {
struct irq_chip_type *ct = gc->chip_types;
if (ct->chip.irq_suspend)
ct->chip.irq_suspend(irq_get_irq_data(gc->irq_base));
if (ct->chip.irq_suspend) {
struct irq_data *data = irq_gc_get_irq_data(gc);
if (data)
ct->chip.irq_suspend(data);
}
}
return 0;
}
@ -375,8 +542,12 @@ static void irq_gc_resume(void)
list_for_each_entry(gc, &gc_list, list) {
struct irq_chip_type *ct = gc->chip_types;
if (ct->chip.irq_resume)
ct->chip.irq_resume(irq_get_irq_data(gc->irq_base));
if (ct->chip.irq_resume) {
struct irq_data *data = irq_gc_get_irq_data(gc);
if (data)
ct->chip.irq_resume(data);
}
}
}
#else
@ -391,8 +562,12 @@ static void irq_gc_shutdown(void)
list_for_each_entry(gc, &gc_list, list) {
struct irq_chip_type *ct = gc->chip_types;
if (ct->chip.irq_pm_shutdown)
ct->chip.irq_pm_shutdown(irq_get_irq_data(gc->irq_base));
if (ct->chip.irq_pm_shutdown) {
struct irq_data *data = irq_gc_get_irq_data(gc);
if (data)
ct->chip.irq_pm_shutdown(data);
}
}
}

6
kernel/irq/irqdomain.c
View File

@ -16,12 +16,6 @@
#include <linux/smp.h>
#include <linux/fs.h>
#define IRQ_DOMAIN_MAP_LEGACY 0 /* driver allocated fixed range of irqs.
* ie. legacy 8259, gets irqs 1..15 */
#define IRQ_DOMAIN_MAP_NOMAP 1 /* no fast reverse mapping */
#define IRQ_DOMAIN_MAP_LINEAR 2 /* linear map of interrupts */
#define IRQ_DOMAIN_MAP_TREE 3 /* radix tree */
static LIST_HEAD(irq_domain_list);
static DEFINE_MUTEX(irq_domain_mutex);