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sh: intc: initial irqdomain support.

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Trivial support for irq domains, using either a linear map or radix tree
depending on the vector layout.

Signed-off-by: Paul Mundt <lethal@linux-sh.org>
This commit is contained in:
Paul Mundt 2012-08-01 17:13:46 +09:00
parent 2d53492620
commit 1d6a21b0a6
5 changed files with 85 additions and 5 deletions
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4
drivers/sh/intc/Kconfig
View File

@ -1,3 +1,7 @@
config SH_INTC
def_bool y
select IRQ_DOMAIN
comment "Interrupt controller options"
config INTC_USERIMASK

2
drivers/sh/intc/Makefile
View File

@ -1,4 +1,4 @@
obj-y := access.o chip.o core.o handle.o virq.o
obj-y := access.o chip.o core.o handle.o irqdomain.o virq.o
obj-$(CONFIG_INTC_BALANCING) += balancing.o
obj-$(CONFIG_INTC_USERIMASK) += userimask.o

11
drivers/sh/intc/core.c
View File

@ -25,6 +25,7 @@
#include <linux/stat.h>
#include <linux/interrupt.h>
#include <linux/sh_intc.h>
#include <linux/irqdomain.h>
#include <linux/device.h>
#include <linux/syscore_ops.h>
#include <linux/list.h>
@ -310,6 +311,8 @@ int __init register_intc_controller(struct intc_desc *desc)
BUG_ON(k > 256); /* _INTC_ADDR_E() and _INTC_ADDR_D() are 8 bits */
intc_irq_domain_init(d, hw);
/* register the vectors one by one */
for (i = 0; i < hw->nr_vectors; i++) {
struct intc_vect *vect = hw->vectors + i;
@ -319,8 +322,8 @@ int __init register_intc_controller(struct intc_desc *desc)
if (!vect->enum_id)
continue;
res = irq_alloc_desc_at(irq, numa_node_id());
if (res != irq && res != -EEXIST) {
res = irq_create_identity_mapping(d->domain, irq);
if (unlikely(res)) {
pr_err("can't get irq_desc for %d\n", irq);
continue;
}
@ -340,8 +343,8 @@ int __init register_intc_controller(struct intc_desc *desc)
* IRQ support, each vector still needs to have
* its own backing irq_desc.
*/
res = irq_alloc_desc_at(irq2, numa_node_id());
if (res != irq2 && res != -EEXIST) {
res = irq_create_identity_mapping(d->domain, irq2);
if (unlikely(res)) {
pr_err("can't get irq_desc for %d\n", irq2);
continue;
}

5
drivers/sh/intc/internals.h
View File

@ -1,5 +1,6 @@
#include <linux/sh_intc.h>
#include <linux/irq.h>
#include <linux/irqdomain.h>
#include <linux/list.h>
#include <linux/kernel.h>
#include <linux/types.h>
@ -66,6 +67,7 @@ struct intc_desc_int {
unsigned int nr_sense;
struct intc_window *window;
unsigned int nr_windows;
struct irq_domain *domain;
struct irq_chip chip;
bool skip_suspend;
};
@ -187,6 +189,9 @@ unsigned long intc_get_ack_handle(unsigned int irq);
void intc_enable_disable_enum(struct intc_desc *desc, struct intc_desc_int *d,
intc_enum enum_id, int enable);
/* irqdomain.c */
void intc_irq_domain_init(struct intc_desc_int *d, struct intc_hw_desc *hw);
/* virq.c */
void intc_subgroup_init(struct intc_desc *desc, struct intc_desc_int *d);
void intc_irq_xlate_set(unsigned int irq, intc_enum id, struct intc_desc_int *d);

68
drivers/sh/intc/irqdomain.c Normal file
View File

@ -0,0 +1,68 @@
/*
* IRQ domain support for SH INTC subsystem
*
* Copyright (C) 2012 Paul Mundt
*
* This file is subject to the terms and conditions of the GNU General Public
* License. See the file "COPYING" in the main directory of this archive
* for more details.
*/
#define pr_fmt(fmt) "intc: " fmt
#include <linux/irqdomain.h>
#include <linux/sh_intc.h>
#include <linux/export.h>
#include "internals.h"
/**
* intc_irq_domain_evt_xlate() - Generic xlate for vectored IRQs.
*
* This takes care of exception vector to hwirq translation through
* by way of evt2irq() translation.
*
* Note: For platforms that use a flat vector space without INTEVT this
* basically just mimics irq_domain_xlate_onecell() by way of a nopped
* out evt2irq() implementation.
*/
static int intc_evt_xlate(struct irq_domain *d, struct device_node *ctrlr,
const u32 *intspec, unsigned int intsize,
unsigned long *out_hwirq, unsigned int *out_type)
{
if (WARN_ON(intsize < 1))
return -EINVAL;
*out_hwirq = evt2irq(intspec[0]);
*out_type = IRQ_TYPE_NONE;
return 0;
}
static const struct irq_domain_ops intc_evt_ops = {
.xlate = intc_evt_xlate,
};
void __init intc_irq_domain_init(struct intc_desc_int *d,
struct intc_hw_desc *hw)
{
unsigned int irq_base, irq_end;
/*
* Quick linear revmap check
*/
irq_base = evt2irq(hw->vectors[0].vect);
irq_end = evt2irq(hw->vectors[hw->nr_vectors - 1].vect);
/*
* Linear domains have a hard-wired assertion that IRQs start at
* 0 in order to make some performance optimizations. Lamely
* restrict the linear case to these conditions here, taking the
* tree penalty for linear cases with non-zero hwirq bases.
*/
if (irq_base == 0 && irq_end == (irq_base + hw->nr_vectors - 1))
d->domain = irq_domain_add_linear(NULL, hw->nr_vectors,
&intc_evt_ops, NULL);
else
d->domain = irq_domain_add_tree(NULL, &intc_evt_ops, NULL);
BUG_ON(!d->domain);
}