1 /* 2 * Xtensa built-in interrupt controller 3 * 4 * Copyright (C) 2002 - 2013 Tensilica, Inc. 5 * Copyright (C) 1992, 1998 Linus Torvalds, Ingo Molnar 6 * 7 * This file is subject to the terms and conditions of the GNU General Public 8 * License. See the file "COPYING" in the main directory of this archive 9 * for more details. 10 * 11 * Chris Zankel <chris@zankel.net> 12 * Kevin Chea 13 */ 14 15 #include <linux/interrupt.h> 16 #include <linux/irqdomain.h> 17 #include <linux/irq.h> 18 #include <linux/of.h> 19 20 #include "irqchip.h" 21 22 unsigned int cached_irq_mask; 23 24 /* 25 * Device Tree IRQ specifier translation function which works with one or 26 * two cell bindings. First cell value maps directly to the hwirq number. 27 * Second cell if present specifies whether hwirq number is external (1) or 28 * internal (0). 29 */ 30 static int xtensa_pic_irq_domain_xlate(struct irq_domain *d, 31 struct device_node *ctrlr, 32 const u32 *intspec, unsigned int intsize, 33 unsigned long *out_hwirq, unsigned int *out_type) 34 { 35 return xtensa_irq_domain_xlate(intspec, intsize, 36 intspec[0], intspec[0], 37 out_hwirq, out_type); 38 } 39 40 static const struct irq_domain_ops xtensa_irq_domain_ops = { 41 .xlate = xtensa_pic_irq_domain_xlate, 42 .map = xtensa_irq_map, 43 }; 44 45 static void xtensa_irq_mask(struct irq_data *d) 46 { 47 cached_irq_mask &= ~(1 << d->hwirq); 48 set_sr(cached_irq_mask, intenable); 49 } 50 51 static void xtensa_irq_unmask(struct irq_data *d) 52 { 53 cached_irq_mask |= 1 << d->hwirq; 54 set_sr(cached_irq_mask, intenable); 55 } 56 57 static void xtensa_irq_enable(struct irq_data *d) 58 { 59 variant_irq_enable(d->hwirq); 60 xtensa_irq_unmask(d); 61 } 62 63 static void xtensa_irq_disable(struct irq_data *d) 64 { 65 xtensa_irq_mask(d); 66 variant_irq_disable(d->hwirq); 67 } 68 69 static void xtensa_irq_ack(struct irq_data *d) 70 { 71 set_sr(1 << d->hwirq, intclear); 72 } 73 74 static int xtensa_irq_retrigger(struct irq_data *d) 75 { 76 set_sr(1 << d->hwirq, intset); 77 return 1; 78 } 79 80 static struct irq_chip xtensa_irq_chip = { 81 .name = "xtensa", 82 .irq_enable = xtensa_irq_enable, 83 .irq_disable = xtensa_irq_disable, 84 .irq_mask = xtensa_irq_mask, 85 .irq_unmask = xtensa_irq_unmask, 86 .irq_ack = xtensa_irq_ack, 87 .irq_retrigger = xtensa_irq_retrigger, 88 }; 89 90 int __init xtensa_pic_init_legacy(struct device_node *interrupt_parent) 91 { 92 struct irq_domain *root_domain = 93 irq_domain_add_legacy(NULL, NR_IRQS, 0, 0, 94 &xtensa_irq_domain_ops, &xtensa_irq_chip); 95 irq_set_default_host(root_domain); 96 return 0; 97 } 98 99 static int __init xtensa_pic_init(struct device_node *np, 100 struct device_node *interrupt_parent) 101 { 102 struct irq_domain *root_domain = 103 irq_domain_add_linear(np, NR_IRQS, &xtensa_irq_domain_ops, 104 &xtensa_irq_chip); 105 irq_set_default_host(root_domain); 106 return 0; 107 } 108 IRQCHIP_DECLARE(xtensa_irq_chip, "cdns,xtensa-pic", xtensa_pic_init); 109