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[MIPS] Define MIPS_CPU_IRQ_BASE in generic header

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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>
This commit is contained in:
Atsushi Nemoto
2007-01-08 02:14:29 +09:00
committed by Ralf Baechle
parent b6ec8f069b
commit 97dcb82de6
40 changed files with 128 additions and 98 deletions
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11
arch/mips/kernel/irq-rm9000.c
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@ -18,16 +18,14 @@
#include <asm/mipsregs.h>
#include <asm/system.h>
static int irq_base;
static inline void unmask_rm9k_irq(unsigned int irq)
{
set_c0_intcontrol(0x1000 << (irq - irq_base));
set_c0_intcontrol(0x1000 << (irq - RM9K_CPU_IRQ_BASE));
}
static inline void mask_rm9k_irq(unsigned int irq)
{
clear_c0_intcontrol(0x1000 << (irq - irq_base));
clear_c0_intcontrol(0x1000 << (irq - RM9K_CPU_IRQ_BASE));
}
static inline void rm9k_cpu_irq_enable(unsigned int irq)
@ -93,8 +91,9 @@ unsigned int rm9000_perfcount_irq;
EXPORT_SYMBOL(rm9000_perfcount_irq);
void __init rm9k_cpu_irq_init(int base)
void __init rm9k_cpu_irq_init(void)
{
int base = RM9K_CPU_IRQ_BASE;
int i;
clear_c0_intcontrol(0x0000f000); /* Mask all */
@ -106,6 +105,4 @@ void __init rm9k_cpu_irq_init(int base)
rm9000_perfcount_irq = base + 1;
set_irq_chip_and_handler(rm9000_perfcount_irq, &rm9k_perfcounter_irq,
handle_level_irq);
irq_base = base;
}