linux-kernel - [PATCH V5 10/30] csky: IRQ handling

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Message-Id: <fbb4e798d1588e9df2da16818932747430068baf.1537789737.git.ren_guo@c-sky.com>
Date:   Mon, 24 Sep 2018 22:36:26 +0800
From:   Guo Ren <ren_guo@...ky.com>
To:     akpm@...ux-foundation.org, arnd@...db.de,
        daniel.lezcano@...aro.org, davem@...emloft.net,
        gregkh@...uxfoundation.org, jason@...edaemon.net,
        marc.zyngier@....com, mark.rutland@....com,
        mchehab+samsung@...nel.org, peterz@...radead.org, robh@...nel.org,
        robh+dt@...nel.org, tglx@...utronix.de
Cc:     linux-kernel@...r.kernel.org, linux-arch@...r.kernel.org,
        devicetree@...r.kernel.org, c-sky_gcc_upstream@...ky.com,
        gnu-csky@...tor.com, green.hu@...il.com, palmer@...ive.com,
        Guo Ren <ren_guo@...ky.com>
Subject: [PATCH V5 10/30] csky: IRQ handling

This patch adds IRQ handling files.

Signed-off-by: Guo Ren <ren_guo@...ky.com>
---
 arch/csky/include/asm/irq.h      |  9 ++++++++
 arch/csky/include/asm/irqflags.h | 50 ++++++++++++++++++++++++++++++++++++++++
 arch/csky/kernel/irq.c           | 22 ++++++++++++++++++
 3 files changed, 81 insertions(+)
 create mode 100644 arch/csky/include/asm/irq.h
 create mode 100644 arch/csky/include/asm/irqflags.h
 create mode 100644 arch/csky/kernel/irq.c

diff --git a/arch/csky/include/asm/irq.h b/arch/csky/include/asm/irq.h
new file mode 100644
index 0000000..970ef4f
--- /dev/null
+++ b/arch/csky/include/asm/irq.h
@@ -0,0 +1,9 @@
+// SPDX-License-Identifier: GPL-2.0
+// Copyright (C) 2018 Hangzhou C-SKY Microsystems co.,ltd.
+
+#ifndef __ASM_CSKY_IRQ_H
+#define __ASM_CSKY_IRQ_H
+
+#include <asm-generic/irq.h>
+
+#endif /* __ASM_CSKY_IRQ_H */
diff --git a/arch/csky/include/asm/irqflags.h b/arch/csky/include/asm/irqflags.h
new file mode 100644
index 0000000..a4fd2dd
--- /dev/null
+++ b/arch/csky/include/asm/irqflags.h
@@ -0,0 +1,50 @@
+// SPDX-License-Identifier: GPL-2.0
+// Copyright (C) 2018 Hangzhou C-SKY Microsystems co.,ltd.
+
+#ifndef __ASM_CSKY_IRQFLAGS_H
+#define __ASM_CSKY_IRQFLAGS_H
+#include <abi/reg_ops.h>
+
+static inline unsigned long arch_local_irq_save(void)
+{
+	unsigned long flags;
+
+	flags = mfcr("psr");
+	asm volatile("psrclr ie\n":::"memory");
+	return flags;
+}
+#define arch_local_irq_save arch_local_irq_save
+
+static inline void arch_local_irq_enable(void)
+{
+	asm volatile("psrset ee, ie\n":::"memory");
+}
+#define arch_local_irq_enable arch_local_irq_enable
+
+static inline void arch_local_irq_disable(void)
+{
+	asm volatile("psrclr ie\n":::"memory");
+}
+#define arch_local_irq_disable arch_local_irq_disable
+
+static inline unsigned long arch_local_save_flags(void)
+{
+	return mfcr("psr");
+}
+#define arch_local_save_flags arch_local_save_flags
+
+static inline void arch_local_irq_restore(unsigned long flags)
+{
+	mtcr("psr", flags);
+}
+#define arch_local_irq_restore arch_local_irq_restore
+
+static inline int arch_irqs_disabled_flags(unsigned long flags)
+{
+	return !(flags & (1<<6));
+}
+#define arch_irqs_disabled_flags arch_irqs_disabled_flags
+
+#include <asm-generic/irqflags.h>
+
+#endif /* __ASM_CSKY_IRQFLAGS_H */
diff --git a/arch/csky/kernel/irq.c b/arch/csky/kernel/irq.c
new file mode 100644
index 0000000..03a1930
--- /dev/null
+++ b/arch/csky/kernel/irq.c
@@ -0,0 +1,22 @@
+// SPDX-License-Identifier: GPL-2.0
+// Copyright (C) 2018 Hangzhou C-SKY Microsystems co.,ltd.
+
+#include <linux/init.h>
+#include <linux/interrupt.h>
+#include <linux/irq.h>
+#include <linux/irqchip.h>
+#include <asm/traps.h>
+#include <asm/smp.h>
+
+void __init init_IRQ(void)
+{
+	irqchip_init();
+#ifdef CONFIG_SMP
+	setup_smp_ipi();
+#endif
+}
+
+asmlinkage void __irq_entry csky_do_IRQ(struct pt_regs *regs)
+{
+	handle_arch_irq(regs);
+}
-- 
2.7.4