db0d4db22a
The GIC support code is heavily using the fact that hardware implementations are exposing banked registers. Unfortunately, it looks like at least one GIC implementation (EXYNOS) offers both the distributor and the CPU interfaces at different addresses, depending on the CPU. This problem is solved by allowing the distributor and CPU interface addresses to be per-cpu variables for the platforms that require it. The EXYNOS code is updated not to mess with the GIC internals while handling interrupts, and struct gic_chip_data is back to being private. The DT binding for the gic is updated to allow an optional "cpu-offset" value, which is used to compute the various base addresses. Finally, a new config option (GIC_NON_BANKED) is used to control this feature, so the overhead is only present on kernels compiled with support for EXYNOS. Tested on Origen (EXYNOS4) and Panda (OMAP4). Cc: Kukjin Kim <kgene.kim@samsung.com> Cc: Will Deacon <will.deacon@arm.com> Cc: Thomas Abraham <thomas.abraham@linaro.org> Acked-by: Rob Herring <rob.herring@calxeda.com> Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
57 lines
1.6 KiB
C
57 lines
1.6 KiB
C
/*
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* arch/arm/include/asm/hardware/gic.h
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*
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* Copyright (C) 2002 ARM Limited, All Rights Reserved.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*/
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#ifndef __ASM_ARM_HARDWARE_GIC_H
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#define __ASM_ARM_HARDWARE_GIC_H
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#include <linux/compiler.h>
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#define GIC_CPU_CTRL 0x00
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#define GIC_CPU_PRIMASK 0x04
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#define GIC_CPU_BINPOINT 0x08
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#define GIC_CPU_INTACK 0x0c
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#define GIC_CPU_EOI 0x10
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#define GIC_CPU_RUNNINGPRI 0x14
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#define GIC_CPU_HIGHPRI 0x18
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#define GIC_DIST_CTRL 0x000
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#define GIC_DIST_CTR 0x004
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#define GIC_DIST_ENABLE_SET 0x100
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#define GIC_DIST_ENABLE_CLEAR 0x180
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#define GIC_DIST_PENDING_SET 0x200
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#define GIC_DIST_PENDING_CLEAR 0x280
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#define GIC_DIST_ACTIVE_BIT 0x300
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#define GIC_DIST_PRI 0x400
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#define GIC_DIST_TARGET 0x800
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#define GIC_DIST_CONFIG 0xc00
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#define GIC_DIST_SOFTINT 0xf00
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#ifndef __ASSEMBLY__
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#include <linux/irqdomain.h>
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struct device_node;
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extern void __iomem *gic_cpu_base_addr;
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extern struct irq_chip gic_arch_extn;
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void gic_init_bases(unsigned int, int, void __iomem *, void __iomem *,
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u32 offset);
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int gic_of_init(struct device_node *node, struct device_node *parent);
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void gic_secondary_init(unsigned int);
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void gic_cascade_irq(unsigned int gic_nr, unsigned int irq);
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void gic_raise_softirq(const struct cpumask *mask, unsigned int irq);
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static inline void gic_init(unsigned int nr, int start,
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void __iomem *dist , void __iomem *cpu)
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{
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gic_init_bases(nr, start, dist, cpu, 0);
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}
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#endif
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#endif
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