| 1 | /* |
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| 2 | * IRQ domain support for SH INTC subsystem |
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| 3 | * |
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| 4 | * Copyright (C) 2012 Paul Mundt |
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| 5 | * |
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| 6 | * This file is subject to the terms and conditions of the GNU General Public |
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| 7 | * License. See the file "COPYING" in the main directory of this archive |
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| 8 | * for more details. |
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| 9 | */ |
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| 10 | #define pr_fmt(fmt) "intc: " fmt |
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| 11 | |
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| 12 | #include <linux/irqdomain.h> |
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| 13 | #include <linux/sh_intc.h> |
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| 14 | #include <linux/export.h> |
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| 15 | #include "internals.h" |
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| 16 | |
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| 17 | /** |
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| 18 | * intc_irq_domain_evt_xlate() - Generic xlate for vectored IRQs. |
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| 19 | * |
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| 20 | * This takes care of exception vector to hwirq translation through |
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| 21 | * by way of evt2irq() translation. |
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| 22 | * |
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| 23 | * Note: For platforms that use a flat vector space without INTEVT this |
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| 24 | * basically just mimics irq_domain_xlate_onecell() by way of a nopped |
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| 25 | * out evt2irq() implementation. |
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| 26 | */ |
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| 27 | static int intc_evt_xlate(struct irq_domain *d, struct device_node *ctrlr, |
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| 28 | const u32 *intspec, unsigned int intsize, |
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| 29 | unsigned long *out_hwirq, unsigned int *out_type) |
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| 30 | { |
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| 31 | if (WARN_ON(intsize < 1)) |
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| 32 | return -EINVAL; |
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| 33 | |
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| 34 | *out_hwirq = evt2irq(intspec[0]); |
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| 35 | *out_type = IRQ_TYPE_NONE; |
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| 36 | |
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| 37 | return 0; |
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| 38 | } |
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| 39 | |
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| 40 | static const struct irq_domain_ops intc_evt_ops = { |
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| 41 | .xlate = intc_evt_xlate, |
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| 42 | }; |
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| 43 | |
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| 44 | void __init intc_irq_domain_init(struct intc_desc_int *d, |
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| 45 | struct intc_hw_desc *hw) |
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| 46 | { |
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| 47 | unsigned int irq_base, irq_end; |
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| 48 | |
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| 49 | /* |
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| 50 | * Quick linear revmap check |
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| 51 | */ |
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| 52 | irq_base = evt2irq(hw->vectors[0].vect); |
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| 53 | irq_end = evt2irq(hw->vectors[hw->nr_vectors - 1].vect); |
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| 54 | |
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| 55 | /* |
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| 56 | * Linear domains have a hard-wired assertion that IRQs start at |
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| 57 | * 0 in order to make some performance optimizations. Lamely |
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| 58 | * restrict the linear case to these conditions here, taking the |
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| 59 | * tree penalty for linear cases with non-zero hwirq bases. |
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| 60 | */ |
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| 61 | if (irq_base == 0 && irq_end == (irq_base + hw->nr_vectors - 1)) |
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| 62 | d->domain = irq_domain_add_linear(NULL, size: hw->nr_vectors, |
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| 63 | ops: &intc_evt_ops, NULL); |
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| 64 | else |
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| 65 | d->domain = irq_domain_add_tree(NULL, ops: &intc_evt_ops, NULL); |
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| 66 | |
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| 67 | BUG_ON(!d->domain); |
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| 68 | } |
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| 69 | |
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