Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753489AbaDRMoF (ORCPT ); Fri, 18 Apr 2014 08:44:05 -0400 Received: from mail-bn1on0111.outbound.protection.outlook.com ([157.56.110.111]:22782 "EHLO na01-bn1-obe.outbound.protection.outlook.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1752904AbaDRMn4 (ORCPT ); Fri, 18 Apr 2014 08:43:56 -0400 From: Ley Foon Tan To: , , CC: Ley Foon Tan , , Subject: [PATCH 13/28] nios2: Interrupt handling Date: Fri, 18 Apr 2014 20:26:57 +0800 Message-ID: <1397824031-4892-11-git-send-email-lftan@altera.com> X-Mailer: git-send-email 1.8.3.2 In-Reply-To: <1397824031-4892-1-git-send-email-lftan@altera.com> References: <1397824031-4892-1-git-send-email-lftan@altera.com> MIME-Version: 1.0 Content-Type: text/plain X-EOPAttributedMessage: 0 X-Forefront-Antispam-Report: CIP:66.35.236.232;CTRY:US;IPV:NLI;EFV:NLI;SFV:NSPM;SFS:(10019001)(6009001)(458001)(189002)(199002)(575784001)(97736001)(46102001)(93916002)(86362001)(50466002)(4396001)(80022001)(76176999)(80976001)(62966002)(81342001)(50226001)(81542001)(48376002)(50986999)(2009001)(99396002)(87286001)(77156001)(89996001)(83072002)(31966008)(85852003)(87936001)(88136002)(36756003)(77982001)(84676001)(42186004)(76482001)(47776003)(19580395003)(20776003)(19580405001)(44976005)(2201001)(92726001)(16796002)(83322001)(6806004)(74502001)(92566001)(74662001);DIR:OUT;SFP:1102;SCL:1;SRVR:BL2FFO11HUB011;H:SJ-ITEXEDGE02.altera.priv.altera.com;FPR:E095F9D5.A7189C25.EF19A5B.47F06A66.20464;MLV:sfv;PTR:InfoDomainNonexistent;MX:1;A:1;LANG:en; X-OriginatorOrg: altera.onmicrosoft.com X-Forefront-PRVS: 018577E36E Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org This patch adds the support for IRQ handling. Signed-off-by: Ley Foon Tan --- 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 + * + * 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 . + * + */ + +#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 +#include + +#endif diff --git a/arch/nios2/include/asm/irqflags.h b/arch/nios2/include/asm/irqflags.h new file mode 100644 index 0000000..e91f4f0b7c69454f7dd89590ddebccff73aad62a --- /dev/null +++ b/arch/nios2/include/asm/irqflags.h @@ -0,0 +1,69 @@ +/* + * Copyright (C) 2010 Thomas Chou + * + * 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 . + * + */ +#ifndef _ASM_IRQFLAGS_H +#define _ASM_IRQFLAGS_H + +#include + +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..e9265bd --- /dev/null +++ b/arch/nios2/kernel/irq.c @@ -0,0 +1,90 @@ +/* + * Copyright (C) 2013 Altera Corporation + * Copyright (C) 2011 Tobias Klauser + * Copyright (C) 2008 Thomas Chou + * + * based on irq.c from m68k which is: + * + * Copyright (C) 2007 Greg Ungerer + * + * 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 . + * + */ + +#include +#include +#include + +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); +} -- 1.8.3.2 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/