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