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/*
* BRIEF MODULE DESCRIPTION
* Code to handle irqs on GT64120A boards
* Derived from mips/orion and Cort <cort@fsmlabs.com>
*
* Copyright (C) 2000 RidgeRun, Inc.
* Author: RidgeRun, Inc.
* glonnon@ridgerun.com, skranz@ridgerun.com, stevej@ridgerun.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 SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN
* NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
* USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
* ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#include <linux/errno.h>
#include <linux/init.h>
#include <linux/kernel_stat.h>
#include <linux/module.h>
#include <linux/signal.h>
#include <linux/sched.h>
#include <linux/types.h>
#include <linux/interrupt.h>
#include <linux/ioport.h>
#include <linux/timex.h>
#include <linux/slab.h>
#include <linux/random.h>
#include <linux/bitops.h>
#include <asm/bootinfo.h>
#include <asm/io.h>
#include <asm/mipsregs.h>
#include <asm/system.h>
#include <asm/gt64120.h>
asmlinkage void plat_irq_dispatch(struct pt_regs *regs)
{
unsigned int pending = read_c0_status() & read_c0_cause();
if (pending & STATUSF_IP4) /* int2 hardware line (timer) */
do_IRQ(4, regs);
else if (pending & STATUSF_IP2) /* int0 hardware line */
do_IRQ(GT_INTA, regs);
else if (pending & STATUSF_IP5) /* int3 hardware line */
do_IRQ(GT_INTD, regs);
else if (pending & STATUSF_IP6) /* int4 hardware line */
do_IRQ(6, regs);
else if (pending & STATUSF_IP7) /* compare int */
do_IRQ(7, regs);
else
spurious_interrupt(regs);
}
static void disable_ev64120_irq(unsigned int irq_nr)
{
unsigned long flags;
local_irq_save(flags);
if (irq_nr >= 8) { // All PCI interrupts are on line 5 or 2
clear_c0_status(9 << 10);
} else {
clear_c0_status(1 << (irq_nr + 8));
}
local_irq_restore(flags);
}
static void enable_ev64120_irq(unsigned int irq_nr)
{
unsigned long flags;
local_irq_save(flags);
if (irq_nr >= 8) // All PCI interrupts are on line 5 or 2
set_c0_status(9 << 10);
else
set_c0_status(1 << (irq_nr + 8));
local_irq_restore(flags);
}
static unsigned int startup_ev64120_irq(unsigned int irq)
{
enable_ev64120_irq(irq);
return 0; /* Never anything pending */
}
#define shutdown_ev64120_irq disable_ev64120_irq
#define mask_and_ack_ev64120_irq disable_ev64120_irq
static void end_ev64120_irq(unsigned int irq)
{
if (!(irq_desc[irq].status & (IRQ_DISABLED|IRQ_INPROGRESS)))
enable_ev64120_irq(irq);
}
static struct hw_interrupt_type ev64120_irq_type = {
.typename = "EV64120",
.startup = startup_ev64120_irq,
.shutdown = shutdown_ev64120_irq,
.enable = enable_ev64120_irq,
.disable = disable_ev64120_irq,
.ack = mask_and_ack_ev64120_irq,
.end = end_ev64120_irq,
.set_affinity = NULL
};
void gt64120_irq_setup(void)
{
/*
* Clear all of the interrupts while we change the able around a bit.
*/
clear_c0_status(ST0_IM);
local_irq_disable();
/*
* Enable timer. Other interrupts will be enabled as they are
* registered.
*/
set_c0_status(IE_IRQ2);
}
void __init arch_init_irq(void)
{
int i;
/* Let's initialize our IRQ descriptors */
for (i = 0; i < NR_IRQS; i++) {
irq_desc[i].status = 0;
irq_desc[i].handler = &no_irq_type;
irq_desc[i].action = NULL;
irq_desc[i].depth = 0;
spin_lock_init(&irq_desc[i].lock);
}
gt64120_irq_setup();
}
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