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/*
* This file is subject to the terms and conditions of the GNU General Public
* License. See the file "COPYING" in the main directory of this archive
* for more details.
*
* Copyright (C) 1992 Linus Torvalds
* Copyright (C) 1994 - 2001, 2003 Ralf Baechle
*/
#include <linux/init.h>
#include <linux/interrupt.h>
#include <linux/kernel.h>
#include <linux/spinlock.h>
#include <asm/irq_cpu.h>
#include <asm/i8259.h>
#include <asm/io.h>
#include <asm/jazz.h>
#include <asm/pgtable.h>
static DEFINE_SPINLOCK(r4030_lock);
static void enable_r4030_irq(unsigned int irq)
{
unsigned int mask = 1 << (irq - JAZZ_IRQ_START);
unsigned long flags;
spin_lock_irqsave(&r4030_lock, flags);
mask |= r4030_read_reg16(JAZZ_IO_IRQ_ENABLE);
r4030_write_reg16(JAZZ_IO_IRQ_ENABLE, mask);
spin_unlock_irqrestore(&r4030_lock, flags);
}
void disable_r4030_irq(unsigned int irq)
{
unsigned int mask = ~(1 << (irq - JAZZ_IRQ_START));
unsigned long flags;
spin_lock_irqsave(&r4030_lock, flags);
mask &= r4030_read_reg16(JAZZ_IO_IRQ_ENABLE);
r4030_write_reg16(JAZZ_IO_IRQ_ENABLE, mask);
spin_unlock_irqrestore(&r4030_lock, flags);
}
static struct irq_chip r4030_irq_type = {
.name = "R4030",
.ack = disable_r4030_irq,
.mask = disable_r4030_irq,
.mask_ack = disable_r4030_irq,
.unmask = enable_r4030_irq,
};
void __init init_r4030_ints(void)
{
int i;
for (i = JAZZ_IRQ_START; i <= JAZZ_IRQ_END; i++)
set_irq_chip_and_handler(i, &r4030_irq_type, handle_level_irq);
r4030_write_reg16(JAZZ_IO_IRQ_ENABLE, 0);
r4030_read_reg16(JAZZ_IO_IRQ_SOURCE); /* clear pending IRQs */
r4030_read_reg32(JAZZ_R4030_INVAL_ADDR); /* clear error bits */
}
/*
* On systems with i8259-style interrupt controllers we assume for
* driver compatibility reasons interrupts 0 - 15 to be the i8259
* interrupts even if the hardware uses a different interrupt numbering.
*/
void __init arch_init_irq(void)
{
/*
* this is a hack to get back the still needed wired mapping
* killed by init_mm()
*/
/* Map 0xe0000000 -> 0x0:800005C0, 0xe0010000 -> 0x1:30000580 */
add_wired_entry(0x02000017, 0x03c00017, 0xe0000000, PM_64K);
/* Map 0xe2000000 -> 0x0:900005C0, 0xe3010000 -> 0x0:910005C0 */
add_wired_entry(0x02400017, 0x02440017, 0xe2000000, PM_16M);
/* Map 0xe4000000 -> 0x0:600005C0, 0xe4100000 -> 400005C0 */
add_wired_entry(0x01800017, 0x01000017, 0xe4000000, PM_4M);
init_i8259_irqs(); /* Integrated i8259 */
mips_cpu_irq_init();
init_r4030_ints();
change_c0_status(ST0_IM, IE_IRQ2 | IE_IRQ1);
}
asmlinkage void plat_irq_dispatch(void)
{
unsigned int pending = read_c0_cause() & read_c0_status();
unsigned int irq;
if (pending & IE_IRQ4) {
r4030_read_reg32(JAZZ_TIMER_REGISTER);
do_IRQ(JAZZ_TIMER_IRQ);
} else if (pending & IE_IRQ2)
do_IRQ(r4030_read_reg32(JAZZ_EISA_IRQ_ACK));
else if (pending & IE_IRQ1) {
irq = *(volatile u8 *)JAZZ_IO_IRQ_SOURCE >> 2;
if (likely(irq > 0))
do_IRQ(irq + JAZZ_IRQ_START - 1);
else
panic("Unimplemented loc_no_irq handler");
}
}
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