This patch adds the support for IRQ handling. Signed-off-by: Ley Foon Tan <lftan@xxxxxxxxxx> --- arch/nios2/include/asm/irq.h | 34 +++++++++++++++ arch/nios2/include/asm/irqflags.h | 69 ++++++++++++++++++++++++++++++ arch/nios2/kernel/irq.c | 90 +++++++++++++++++++++++++++++++++++++++ 3 files changed, 193 insertions(+) create mode 100644 arch/nios2/include/asm/irq.h create mode 100644 arch/nios2/include/asm/irqflags.h create mode 100644 arch/nios2/kernel/irq.c diff --git a/arch/nios2/include/asm/irq.h b/arch/nios2/include/asm/irq.h new file mode 100644 index 0000000..f7e94b9 --- /dev/null +++ b/arch/nios2/include/asm/irq.h @@ -0,0 +1,34 @@ +/* + * Copyright (C) 2013 Altera Corporation + * Copyright (C) 2011 Tobias Klauser <tklauser@xxxxxxxxxx> + * + * 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 +/* Reserve 32 additional interrupts for GPIO IRQs */ +#define NR_IRQS (NIOS2_CPU_NR_IRQS + 32) + +#ifndef NO_IRQ +#define NO_IRQ (-1) +#endif + +#include <asm-generic/irq.h> +#include <linux/irqdomain.h> + +#endif diff --git a/arch/nios2/include/asm/irqflags.h b/arch/nios2/include/asm/irqflags.h new file mode 100644 index 0000000..e91f4f0 --- /dev/null +++ b/arch/nios2/include/asm/irqflags.h @@ -0,0 +1,69 @@ +/* + * Copyright (C) 2010 Thomas Chou <thomas@xxxxxxxxxxxxx> + * + * 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 */ diff --git a/arch/nios2/kernel/irq.c b/arch/nios2/kernel/irq.c new file mode 100644 index 0000000..8770d50 --- /dev/null +++ b/arch/nios2/kernel/irq.c @@ -0,0 +1,90 @@ +/* + * Copyright (C) 2013 Altera Corporation + * Copyright (C) 2011 Tobias Klauser <tklauser@xxxxxxxxxx> + * Copyright (C) 2008 Thomas Chou <thomas@xxxxxxxxxxxxx> + * + * based on irq.c from m68k which is: + * + * Copyright (C) 2007 Greg Ungerer <gerg@xxxxxxxxxxxx> + * + * 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> + +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) +{ + u32 ien; + ien = RDCTL(CTL_IENABLE); + ien |= (1 << d->hwirq); + WRCTL(CTL_IENABLE, ien); +} + +static void chip_mask(struct irq_data *d) +{ + u32 ien; + ien = RDCTL(CTL_IENABLE); + ien &= ~(1 << d->hwirq); + WRCTL(CTL_IENABLE, ien); +} + +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"); + 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); +} -- 1.8.2.1 -- To unsubscribe from this list: send the line "unsubscribe linux-doc" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
