69 lines · c
1/*2 * IRQ domain support for SH INTC subsystem3 *4 * Copyright (C) 2012 Paul Mundt5 *6 * This file is subject to the terms and conditions of the GNU General Public7 * License. See the file "COPYING" in the main directory of this archive8 * for more details.9 */10#define pr_fmt(fmt) "intc: " fmt11 12#include <linux/irqdomain.h>13#include <linux/sh_intc.h>14#include <linux/export.h>15#include "internals.h"16 17/**18 * intc_irq_domain_evt_xlate() - Generic xlate for vectored IRQs.19 *20 * This takes care of exception vector to hwirq translation through21 * by way of evt2irq() translation.22 *23 * Note: For platforms that use a flat vector space without INTEVT this24 * basically just mimics irq_domain_xlate_onecell() by way of a nopped25 * out evt2irq() implementation.26 */27static int intc_evt_xlate(struct irq_domain *d, struct device_node *ctrlr,28 const u32 *intspec, unsigned int intsize,29 unsigned long *out_hwirq, unsigned int *out_type)30{31 if (WARN_ON(intsize < 1))32 return -EINVAL;33 34 *out_hwirq = evt2irq(intspec[0]);35 *out_type = IRQ_TYPE_NONE;36 37 return 0;38}39 40static const struct irq_domain_ops intc_evt_ops = {41 .xlate = intc_evt_xlate,42};43 44void __init intc_irq_domain_init(struct intc_desc_int *d,45 struct intc_hw_desc *hw)46{47 unsigned int irq_base, irq_end;48 49 /*50 * Quick linear revmap check51 */52 irq_base = evt2irq(hw->vectors[0].vect);53 irq_end = evt2irq(hw->vectors[hw->nr_vectors - 1].vect);54 55 /*56 * Linear domains have a hard-wired assertion that IRQs start at57 * 0 in order to make some performance optimizations. Lamely58 * restrict the linear case to these conditions here, taking the59 * tree penalty for linear cases with non-zero hwirq bases.60 */61 if (irq_base == 0 && irq_end == (irq_base + hw->nr_vectors - 1))62 d->domain = irq_domain_add_linear(NULL, hw->nr_vectors,63 &intc_evt_ops, NULL);64 else65 d->domain = irq_domain_add_tree(NULL, &intc_evt_ops, NULL);66 67 BUG_ON(!d->domain);68}69