f27ffc751c
This patch adds the support for IRQ handling. Signed-off-by: Ley Foon Tan <lftan@altera.com> Reviewed-by: Thomas Gleixner <tglx@linutronix.de>
94 lines
2.3 KiB
C
94 lines
2.3 KiB
C
/*
|
|
* Copyright (C) 2013 Altera Corporation
|
|
* Copyright (C) 2011 Tobias Klauser <tklauser@distanz.ch>
|
|
* Copyright (C) 2008 Thomas Chou <thomas@wytron.com.tw>
|
|
*
|
|
* based on irq.c from m68k which is:
|
|
*
|
|
* Copyright (C) 2007 Greg Ungerer <gerg@snapgear.com>
|
|
*
|
|
* This program is free software; you can redistribute it and/or modify
|
|
* it under the terms of the GNU General Public License as published by
|
|
* the Free Software Foundation; either version 2 of the License, or
|
|
* (at your option) any later version.
|
|
*
|
|
* This program is distributed in the hope that it will be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
* GNU General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU General Public License
|
|
* along with this program. If not, see <http://www.gnu.org/licenses/>.
|
|
*
|
|
*/
|
|
|
|
#include <linux/init.h>
|
|
#include <linux/interrupt.h>
|
|
#include <linux/of.h>
|
|
|
|
static u32 ienable;
|
|
|
|
asmlinkage void do_IRQ(int hwirq, struct pt_regs *regs)
|
|
{
|
|
struct pt_regs *oldregs = set_irq_regs(regs);
|
|
int irq;
|
|
|
|
irq_enter();
|
|
irq = irq_find_mapping(NULL, hwirq);
|
|
generic_handle_irq(irq);
|
|
irq_exit();
|
|
|
|
set_irq_regs(oldregs);
|
|
}
|
|
|
|
static void chip_unmask(struct irq_data *d)
|
|
{
|
|
ienable |= (1 << d->hwirq);
|
|
WRCTL(CTL_IENABLE, ienable);
|
|
}
|
|
|
|
static void chip_mask(struct irq_data *d)
|
|
{
|
|
ienable &= ~(1 << d->hwirq);
|
|
WRCTL(CTL_IENABLE, ienable);
|
|
}
|
|
|
|
static struct irq_chip m_irq_chip = {
|
|
.name = "NIOS2-INTC",
|
|
.irq_unmask = chip_unmask,
|
|
.irq_mask = chip_mask,
|
|
};
|
|
|
|
static int irq_map(struct irq_domain *h, unsigned int virq,
|
|
irq_hw_number_t hw_irq_num)
|
|
{
|
|
irq_set_chip_and_handler(virq, &m_irq_chip, handle_level_irq);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static struct irq_domain_ops irq_ops = {
|
|
.map = irq_map,
|
|
.xlate = irq_domain_xlate_onecell,
|
|
};
|
|
|
|
void __init init_IRQ(void)
|
|
{
|
|
struct irq_domain *domain;
|
|
struct device_node *node;
|
|
|
|
node = of_find_compatible_node(NULL, NULL, "altr,nios2-1.0");
|
|
if (!node)
|
|
node = of_find_compatible_node(NULL, NULL, "altr,nios2-1.1");
|
|
|
|
BUG_ON(!node);
|
|
|
|
domain = irq_domain_add_linear(node, NIOS2_CPU_NR_IRQS, &irq_ops, NULL);
|
|
BUG_ON(!domain);
|
|
|
|
irq_set_default_host(domain);
|
|
of_node_put(node);
|
|
/* Load the initial ienable value */
|
|
ienable = RDCTL(CTL_IENABLE);
|
|
}
|