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68 lines
1.9 KiB
68 lines
1.9 KiB
/* |
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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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