| /* |
| * 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); |
| } |