forked from Minki/linux
239007b844
Convert locks which cannot be sleeping locks in preempt-rt to raw_spinlocks. Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Acked-by: Peter Zijlstra <peterz@infradead.org> Acked-by: Ingo Molnar <mingo@elte.hu>
126 lines
2.8 KiB
C
126 lines
2.8 KiB
C
/*
|
|
* arch/arm/mach-ns9xxx/irq.c
|
|
*
|
|
* Copyright (C) 2006,2007 by Digi International Inc.
|
|
* All rights reserved.
|
|
*
|
|
* This program is free software; you can redistribute it and/or modify it
|
|
* under the terms of the GNU General Public License version 2 as published by
|
|
* the Free Software Foundation.
|
|
*/
|
|
#include <linux/interrupt.h>
|
|
#include <linux/kernel_stat.h>
|
|
#include <linux/io.h>
|
|
#include <asm/mach/irq.h>
|
|
#include <mach/regs-sys-common.h>
|
|
#include <mach/irqs.h>
|
|
#include <mach/board.h>
|
|
|
|
#include "generic.h"
|
|
|
|
/* simple interrupt prio table: prio(x) < prio(y) <=> x < y */
|
|
#define irq2prio(i) (i)
|
|
#define prio2irq(p) (p)
|
|
|
|
static void ns9xxx_mask_irq(unsigned int irq)
|
|
{
|
|
/* XXX: better use cpp symbols */
|
|
int prio = irq2prio(irq);
|
|
u32 ic = __raw_readl(SYS_IC(prio / 4));
|
|
ic &= ~(1 << (7 + 8 * (3 - (prio & 3))));
|
|
__raw_writel(ic, SYS_IC(prio / 4));
|
|
}
|
|
|
|
static void ns9xxx_ack_irq(unsigned int irq)
|
|
{
|
|
__raw_writel(0, SYS_ISRADDR);
|
|
}
|
|
|
|
static void ns9xxx_maskack_irq(unsigned int irq)
|
|
{
|
|
ns9xxx_mask_irq(irq);
|
|
ns9xxx_ack_irq(irq);
|
|
}
|
|
|
|
static void ns9xxx_unmask_irq(unsigned int irq)
|
|
{
|
|
/* XXX: better use cpp symbols */
|
|
int prio = irq2prio(irq);
|
|
u32 ic = __raw_readl(SYS_IC(prio / 4));
|
|
ic |= 1 << (7 + 8 * (3 - (prio & 3)));
|
|
__raw_writel(ic, SYS_IC(prio / 4));
|
|
}
|
|
|
|
static struct irq_chip ns9xxx_chip = {
|
|
.ack = ns9xxx_ack_irq,
|
|
.mask = ns9xxx_mask_irq,
|
|
.mask_ack = ns9xxx_maskack_irq,
|
|
.unmask = ns9xxx_unmask_irq,
|
|
};
|
|
|
|
#if 0
|
|
#define handle_irq handle_level_irq
|
|
#else
|
|
static void handle_prio_irq(unsigned int irq, struct irq_desc *desc)
|
|
{
|
|
struct irqaction *action;
|
|
irqreturn_t action_ret;
|
|
|
|
raw_spin_lock(&desc->lock);
|
|
|
|
BUG_ON(desc->status & IRQ_INPROGRESS);
|
|
|
|
desc->status &= ~(IRQ_REPLAY | IRQ_WAITING);
|
|
kstat_incr_irqs_this_cpu(irq, desc);
|
|
|
|
action = desc->action;
|
|
if (unlikely(!action || (desc->status & IRQ_DISABLED)))
|
|
goto out_mask;
|
|
|
|
desc->status |= IRQ_INPROGRESS;
|
|
raw_spin_unlock(&desc->lock);
|
|
|
|
action_ret = handle_IRQ_event(irq, action);
|
|
|
|
/* XXX: There is no direct way to access noirqdebug, so check
|
|
* unconditionally for spurious irqs...
|
|
* Maybe this function should go to kernel/irq/chip.c? */
|
|
note_interrupt(irq, desc, action_ret);
|
|
|
|
raw_spin_lock(&desc->lock);
|
|
desc->status &= ~IRQ_INPROGRESS;
|
|
|
|
if (desc->status & IRQ_DISABLED)
|
|
out_mask:
|
|
desc->chip->mask(irq);
|
|
|
|
/* ack unconditionally to unmask lower prio irqs */
|
|
desc->chip->ack(irq);
|
|
|
|
raw_spin_unlock(&desc->lock);
|
|
}
|
|
#define handle_irq handle_prio_irq
|
|
#endif
|
|
|
|
void __init ns9xxx_init_irq(void)
|
|
{
|
|
int i;
|
|
|
|
/* disable all IRQs */
|
|
for (i = 0; i < 8; ++i)
|
|
__raw_writel(prio2irq(4 * i) << 24 |
|
|
prio2irq(4 * i + 1) << 16 |
|
|
prio2irq(4 * i + 2) << 8 |
|
|
prio2irq(4 * i + 3),
|
|
SYS_IC(i));
|
|
|
|
for (i = 0; i < 32; ++i)
|
|
__raw_writel(prio2irq(i), SYS_IVA(i));
|
|
|
|
for (i = 0; i <= 31; ++i) {
|
|
set_irq_chip(i, &ns9xxx_chip);
|
|
set_irq_handler(i, handle_irq);
|
|
set_irq_flags(i, IRQF_VALID);
|
|
}
|
|
}
|