| Paul Mundt | 1d6a21b | 2012-08-01 17:13:46 +0900 | [diff] [blame] | 1 | /* |
| 2 | * IRQ domain support for SH INTC subsystem |
| 3 | * |
| 4 | * Copyright (C) 2012 Paul Mundt |
| 5 | * |
| 6 | * This file is subject to the terms and conditions of the GNU General Public |
| 7 | * License. See the file "COPYING" in the main directory of this archive |
| 8 | * for more details. |
| 9 | */ |
| 10 | #define pr_fmt(fmt) "intc: " fmt |
| 11 | |
| 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 through |
| 21 | * by way of evt2irq() translation. |
| 22 | * |
| 23 | * Note: For platforms that use a flat vector space without INTEVT this |
| 24 | * basically just mimics irq_domain_xlate_onecell() by way of a nopped |
| 25 | * out evt2irq() implementation. |
| 26 | */ |
| 27 | static 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 | |
| 40 | static const struct irq_domain_ops intc_evt_ops = { |
| 41 | .xlate = intc_evt_xlate, |
| 42 | }; |
| 43 | |
| 44 | void __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 check |
| 51 | */ |
| 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 at |
| 57 | * 0 in order to make some performance optimizations. Lamely |
| 58 | * restrict the linear case to these conditions here, taking the |
| 59 | * 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 | else |
| 65 | d->domain = irq_domain_add_tree(NULL, &intc_evt_ops, NULL); |
| 66 | |
| 67 | BUG_ON(!d->domain); |
| 68 | } |