97dcb82de6
The irq_base for {mips,rm7k,rm9k}_cpu_irq_init() are constant on all
platforms and are same value on most platforms (0 or 16, depends on
CONFIG_I8259). Define them in asm-mips/mach-generic/irq.h and make
them customizable. This will save a few cycle on each CPU interrupt.
A good side effect is removing some dependencies to MALTA in generic
SMTC code.
Although MIPS_CPU_IRQ_BASE is customizable, this patch changes irq
mappings on DDB5477, EMMA2RH and MIPS_SIM, since really customizing
them might cause some header dependency problem and there seems no
good reason to customize it. So currently only VR41XX is using custom
MIPS_CPU_IRQ_BASE value, which is 0 regardless of CONFIG_I8259.
Testing this patch on those platforms is greatly appreciated. Thank
you.
Signed-off-by: Atsushi Nemoto <anemo@mba.ocn.ne.jp>
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
49 lines
1.2 KiB
C
49 lines
1.2 KiB
C
/*
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* Copyright (C) 2003 Ralf Baechle
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the
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* Free Software Foundation; either version 2 of the License, or (at your
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* option) any later version.
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*
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* Handler for RM7000 extended interrupts. These are a non-standard
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* feature so we handle them separately from standard interrupts.
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*/
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#include <linux/init.h>
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#include <linux/interrupt.h>
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#include <linux/kernel.h>
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#include <asm/irq_cpu.h>
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#include <asm/mipsregs.h>
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#include <asm/system.h>
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static inline void unmask_rm7k_irq(unsigned int irq)
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{
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set_c0_intcontrol(0x100 << (irq - RM7K_CPU_IRQ_BASE));
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}
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static inline void mask_rm7k_irq(unsigned int irq)
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{
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clear_c0_intcontrol(0x100 << (irq - RM7K_CPU_IRQ_BASE));
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}
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static struct irq_chip rm7k_irq_controller = {
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.typename = "RM7000",
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.ack = mask_rm7k_irq,
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.mask = mask_rm7k_irq,
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.mask_ack = mask_rm7k_irq,
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.unmask = unmask_rm7k_irq,
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};
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void __init rm7k_cpu_irq_init(void)
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{
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int base = RM7K_CPU_IRQ_BASE;
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int i;
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clear_c0_intcontrol(0x00000f00); /* Mask all */
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for (i = base; i < base + 4; i++)
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set_irq_chip_and_handler(i, &rm7k_irq_controller,
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handle_level_irq);
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}
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