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/* irq.c: FRV IRQ handling
*
* Copyright (C) 2003, 2004, 2006 Red Hat, Inc. All Rights Reserved.
* Written by David Howells (dhowells@redhat.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.
*/
#include <linux/ptrace.h>
#include <linux/errno.h>
#include <linux/signal.h>
#include <linux/sched.h>
#include <linux/ioport.h>
#include <linux/interrupt.h>
#include <linux/timex.h>
#include <linux/random.h>
#include <linux/init.h>
#include <linux/kernel_stat.h>
#include <linux/irq.h>
#include <linux/proc_fs.h>
#include <linux/seq_file.h>
#include <linux/module.h>
#include <linux/bitops.h>
#include <linux/atomic.h>
#include <asm/io.h>
#include <asm/smp.h>
#include <linux/uaccess.h>
#include <asm/pgalloc.h>
#include <asm/delay.h>
#include <asm/irq.h>
#include <asm/irc-regs.h>
#include <asm/gdb-stub.h>
#define set_IRR(N,A,B,C,D) __set_IRR(N, (A << 28) | (B << 24) | (C << 20) | (D << 16))
extern void __init fpga_init(void);
#ifdef CONFIG_FUJITSU_MB93493
extern void __init mb93493_init(void);
#endif
#define __reg16(ADDR) (*(volatile unsigned short *)(ADDR))
atomic_t irq_err_count;
int arch_show_interrupts(struct seq_file *p, int prec)
{
seq_printf(p, "%*s: ", prec, "ERR");
seq_printf(p, "%10u\n", atomic_read(&irq_err_count));
return 0;
}
/*
* on-CPU PIC operations
*/
static void frv_cpupic_ack(struct irq_data *d)
{
__clr_RC(d->irq);
__clr_IRL();
}
static void frv_cpupic_mask(struct irq_data *d)
{
__set_MASK(d->irq);
}
static void frv_cpupic_mask_ack(struct irq_data *d)
{
__set_MASK(d->irq);
__clr_RC(d->irq);
__clr_IRL();
}
static void frv_cpupic_unmask(struct irq_data *d)
{
__clr_MASK(d->irq);
}
static struct irq_chip frv_cpu_pic = {
.name = "cpu",
.irq_ack = frv_cpupic_ack,
.irq_mask = frv_cpupic_mask,
.irq_mask_ack = frv_cpupic_mask_ack,
.irq_unmask = frv_cpupic_unmask,
};
/*
* handles all normal device IRQs
* - registers are referred to by the __frame variable (GR28)
* - IRQ distribution is complicated in this arch because of the many PICs, the
* way they work and the way they cascade
*/
asmlinkage void do_IRQ(void)
{
irq_enter();
generic_handle_irq(__get_IRL());
irq_exit();
}
/*
* handles all NMIs when not co-opted by the debugger
* - registers are referred to by the __frame variable (GR28)
*/
asmlinkage void do_NMI(void)
{
}
/*
* initialise the interrupt system
*/
void __init init_IRQ(void)
{
int level;
for (level = 1; level <= 14; level++)
irq_set_chip_and_handler(level, &frv_cpu_pic,
handle_level_irq);
irq_set_handler(IRQ_CPU_TIMER0, handle_edge_irq);
/* set the trigger levels for internal interrupt sources
* - timers all falling-edge
* - ERR0 is rising-edge
* - all others are high-level
*/
__set_IITMR(0, 0x003f0000); /* DMA0-3, TIMER0-2 */
__set_IITMR(1, 0x20000000); /* ERR0-1, UART0-1, DMA4-7 */
/* route internal interrupts */
set_IRR(4, IRQ_DMA3_LEVEL, IRQ_DMA2_LEVEL, IRQ_DMA1_LEVEL,
IRQ_DMA0_LEVEL);
set_IRR(5, 0, IRQ_TIMER2_LEVEL, IRQ_TIMER1_LEVEL, IRQ_TIMER0_LEVEL);
set_IRR(6, IRQ_GDBSTUB_LEVEL, IRQ_GDBSTUB_LEVEL,
IRQ_UART1_LEVEL, IRQ_UART0_LEVEL);
set_IRR(7, IRQ_DMA7_LEVEL, IRQ_DMA6_LEVEL, IRQ_DMA5_LEVEL,
IRQ_DMA4_LEVEL);
/* route external interrupts */
set_IRR(2, IRQ_XIRQ7_LEVEL, IRQ_XIRQ6_LEVEL, IRQ_XIRQ5_LEVEL,
IRQ_XIRQ4_LEVEL);
set_IRR(3, IRQ_XIRQ3_LEVEL, IRQ_XIRQ2_LEVEL, IRQ_XIRQ1_LEVEL,
IRQ_XIRQ0_LEVEL);
#if defined(CONFIG_MB93091_VDK)
__set_TM1(0x55550000); /* XIRQ7-0 all active low */
#elif defined(CONFIG_MB93093_PDK)
__set_TM1(0x15550000); /* XIRQ7 active high, 6-0 all active low */
#else
#error dont know external IRQ trigger levels for this setup
#endif
fpga_init();
#ifdef CONFIG_FUJITSU_MB93493
mb93493_init();
#endif
}
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