mirror of
https://github.com/torvalds/linux.git
synced 2024-11-27 06:31:52 +00:00
1d6a21b0a6
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>
69 lines
1.9 KiB
C
69 lines
1.9 KiB
C
/*
|
|
* 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);
|
|
}
|