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