/* * Xtensa built-in interrupt controller * * Copyright (C) 2002 - 2013 Tensilica, Inc. * Copyright (C) 1992, 1998 Linus Torvalds, Ingo Molnar * * 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. * * Chris Zankel <chris@zankel.net> * Kevin Chea */ #include <linux/interrupt.h> #include <linux/irqdomain.h> #include <linux/irq.h> #include <linux/irqchip.h> #include <linux/irqchip/xtensa-pic.h> #include <linux/of.h> unsigned int cached_irq_mask; /* * Device Tree IRQ specifier translation function which works with one or * two cell bindings. First cell value maps directly to the hwirq number. * Second cell if present specifies whether hwirq number is external (1) or * internal (0). */ static int xtensa_pic_irq_domain_xlate(struct irq_domain *d, struct device_node *ctrlr, const u32 *intspec, unsigned int intsize, unsigned long *out_hwirq, unsigned int *out_type) { return xtensa_irq_domain_xlate(intspec, intsize, intspec[0], intspec[0], out_hwirq, out_type); } static const struct irq_domain_ops xtensa_irq_domain_ops = { .xlate = xtensa_pic_irq_domain_xlate, .map = xtensa_irq_map, }; static void xtensa_irq_mask(struct irq_data *d) { cached_irq_mask &= ~(1 << d->hwirq); xtensa_set_sr(cached_irq_mask, intenable); } static void xtensa_irq_unmask(struct irq_data *d) { cached_irq_mask |= 1 << d->hwirq; xtensa_set_sr(cached_irq_mask, intenable); } static void xtensa_irq_enable(struct irq_data *d) { xtensa_irq_unmask(d); } static void xtensa_irq_disable(struct irq_data *d) { xtensa_irq_mask(d); } static void xtensa_irq_ack(struct irq_data *d) { xtensa_set_sr(1 << d->hwirq, intclear); } static int xtensa_irq_retrigger(struct irq_data *d) { unsigned int mask = 1u << d->hwirq; if (WARN_ON(mask & ~XCHAL_INTTYPE_MASK_SOFTWARE)) return 0; xtensa_set_sr(mask, intset); return 1; } static struct irq_chip xtensa_irq_chip = { .name = "xtensa", .irq_enable = xtensa_irq_enable, .irq_disable = xtensa_irq_disable, .irq_mask = xtensa_irq_mask, .irq_unmask = xtensa_irq_unmask, .irq_ack = xtensa_irq_ack, .irq_retrigger = xtensa_irq_retrigger, }; int __init xtensa_pic_init_legacy(struct device_node *interrupt_parent) { struct irq_domain *root_domain = irq_domain_add_legacy(NULL, NR_IRQS - 1, 1, 0, &xtensa_irq_domain_ops, &xtensa_irq_chip); irq_set_default_host(root_domain); return 0; } static int __init xtensa_pic_init(struct device_node *np, struct device_node *interrupt_parent) { struct irq_domain *root_domain = irq_domain_add_linear(np, NR_IRQS, &xtensa_irq_domain_ops, &xtensa_irq_chip); irq_set_default_host(root_domain); return 0; } IRQCHIP_DECLARE(xtensa_irq_chip, "cdns,xtensa-pic", xtensa_pic_init);