nios2: Interrupt handling (f27ffc75) · Commits · e / devices / android_kernel_fairphone_FP5

arch/nios2/include/asm/irq.h

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		/*
		* Copyright (C) 2013 Altera Corporation
		* Copyright (C) 2011 Tobias Klauser <tklauser@distanz.ch>
		*
		* This program is free software; you can redistribute it and/or modify
		* it under the terms of the GNU General Public License as published by
		* the Free Software Foundation; either version 2 of the License, or
		* (at your option) any later version.
		*
		* This program is distributed in the hope that it will be useful,
		* but WITHOUT ANY WARRANTY; without even the implied warranty of
		* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
		* GNU General Public License for more details.
		*
		* You should have received a copy of the GNU General Public License
		* along with this program. If not, see <http://www.gnu.org/licenses/>.
		*
		*/

		#ifndef _ASM_NIOS2_IRQ_H
		#define _ASM_NIOS2_IRQ_H

		#define NIOS2_CPU_NR_IRQS 32

		#include <asm-generic/irq.h>
		#include <linux/irqdomain.h>

		#endif

arch/nios2/include/asm/irqflags.h

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		/*
		* Copyright (C) 2010 Thomas Chou <thomas@wytron.com.tw>
		*
		* This program is free software; you can redistribute it and/or modify
		* it under the terms of the GNU General Public License as published by
		* the Free Software Foundation; either version 2 of the License, or
		* (at your option) any later version.
		*
		* This program is distributed in the hope that it will be useful,
		* but WITHOUT ANY WARRANTY; without even the implied warranty of
		* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
		* GNU General Public License for more details.
		*
		* You should have received a copy of the GNU General Public License
		* along with this program. If not, see <http://www.gnu.org/licenses/>.
		*
		*/
		#ifndef _ASM_IRQFLAGS_H
		#define _ASM_IRQFLAGS_H

		#include <asm/registers.h>

		static inline unsigned long arch_local_save_flags(void)
		{
		return RDCTL(CTL_STATUS);
		}

		/*
		* This will restore ALL status register flags, not only the interrupt
		* mask flag.
		*/
		static inline void arch_local_irq_restore(unsigned long flags)
		{
		WRCTL(CTL_STATUS, flags);
		}

		static inline void arch_local_irq_disable(void)
		{
		unsigned long flags;

		flags = arch_local_save_flags();
		arch_local_irq_restore(flags & ~STATUS_PIE);
		}

		static inline void arch_local_irq_enable(void)
		{
		unsigned long flags;

		flags = arch_local_save_flags();
		arch_local_irq_restore(flags \| STATUS_PIE);
		}

		static inline int arch_irqs_disabled_flags(unsigned long flags)
		{
		return (flags & STATUS_PIE) == 0;
		}

		static inline int arch_irqs_disabled(void)
		{
		return arch_irqs_disabled_flags(arch_local_save_flags());
		}

		static inline unsigned long arch_local_irq_save(void)
		{
		unsigned long flags;

		flags = arch_local_save_flags();
		arch_local_irq_restore(flags & ~STATUS_PIE);
		return flags;
		}

		#endif /* _ASM_IRQFLAGS_H */

arch/nios2/kernel/irq.c

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		/*
		* Copyright (C) 2013 Altera Corporation
		* Copyright (C) 2011 Tobias Klauser <tklauser@distanz.ch>
		* Copyright (C) 2008 Thomas Chou <thomas@wytron.com.tw>
		*
		* based on irq.c from m68k which is:
		*
		* Copyright (C) 2007 Greg Ungerer <gerg@snapgear.com>
		*
		* This program is free software; you can redistribute it and/or modify
		* it under the terms of the GNU General Public License as published by
		* the Free Software Foundation; either version 2 of the License, or
		* (at your option) any later version.
		*
		* This program is distributed in the hope that it will be useful,
		* but WITHOUT ANY WARRANTY; without even the implied warranty of
		* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
		* GNU General Public License for more details.
		*
		* You should have received a copy of the GNU General Public License
		* along with this program. If not, see <http://www.gnu.org/licenses/>.
		*
		*/

		#include <linux/init.h>
		#include <linux/interrupt.h>
		#include <linux/of.h>

		static u32 ienable;

		asmlinkage void do_IRQ(int hwirq, struct pt_regs *regs)
		{
		struct pt_regs *oldregs = set_irq_regs(regs);
		int irq;

		irq_enter();
		irq = irq_find_mapping(NULL, hwirq);
		generic_handle_irq(irq);
		irq_exit();

		set_irq_regs(oldregs);
		}

		static void chip_unmask(struct irq_data *d)
		{
		ienable \|= (1 << d->hwirq);
		WRCTL(CTL_IENABLE, ienable);
		}

		static void chip_mask(struct irq_data *d)
		{
		ienable &= ~(1 << d->hwirq);
		WRCTL(CTL_IENABLE, ienable);
		}

		static struct irq_chip m_irq_chip = {
		.name = "NIOS2-INTC",
		.irq_unmask = chip_unmask,
		.irq_mask = chip_mask,
		};

		static int irq_map(struct irq_domain *h, unsigned int virq,
		irq_hw_number_t hw_irq_num)
		{
		irq_set_chip_and_handler(virq, &m_irq_chip, handle_level_irq);

		return 0;
		}

		static struct irq_domain_ops irq_ops = {
		.map = irq_map,
		.xlate = irq_domain_xlate_onecell,
		};

		void __init init_IRQ(void)
		{
		struct irq_domain *domain;
		struct device_node *node;

		node = of_find_compatible_node(NULL, NULL, "altr,nios2-1.0");
		if (!node)
		node = of_find_compatible_node(NULL, NULL, "altr,nios2-1.1");

		BUG_ON(!node);

		domain = irq_domain_add_linear(node, NIOS2_CPU_NR_IRQS, &irq_ops, NULL);
		BUG_ON(!domain);

		irq_set_default_host(domain);
		of_node_put(node);
		/* Load the initial ienable value */
		ienable = RDCTL(CTL_IENABLE);
		}