148 lines
3.7 KiB
C
148 lines
3.7 KiB
C
/*
|
|
* 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/i8259.h>
|
|
#include <asm/io.h>
|
|
#include <asm/jazz.h>
|
|
|
|
static DEFINE_SPINLOCK(r4030_lock);
|
|
|
|
static void enable_r4030_irq(unsigned int irq)
|
|
{
|
|
unsigned int mask = 1 << (irq - JAZZ_PARALLEL_IRQ);
|
|
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_PARALLEL_IRQ));
|
|
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_PARALLEL_IRQ; i <= JAZZ_TIMER_IRQ; 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)
|
|
{
|
|
init_i8259_irqs(); /* Integrated i8259 */
|
|
init_r4030_ints();
|
|
|
|
change_c0_status(ST0_IM, IE_IRQ4 | IE_IRQ3 | IE_IRQ2 | IE_IRQ1);
|
|
}
|
|
|
|
static void loc_call(unsigned int irq, unsigned int mask)
|
|
{
|
|
r4030_write_reg16(JAZZ_IO_IRQ_ENABLE,
|
|
r4030_read_reg16(JAZZ_IO_IRQ_ENABLE) & mask);
|
|
do_IRQ(irq);
|
|
r4030_write_reg16(JAZZ_IO_IRQ_ENABLE,
|
|
r4030_read_reg16(JAZZ_IO_IRQ_ENABLE) | mask);
|
|
}
|
|
|
|
static void ll_local_dev(void)
|
|
{
|
|
switch (r4030_read_reg32(JAZZ_IO_IRQ_SOURCE)) {
|
|
case 0:
|
|
panic("Unimplemented loc_no_irq handler");
|
|
break;
|
|
case 4:
|
|
loc_call(JAZZ_PARALLEL_IRQ, JAZZ_IE_PARALLEL);
|
|
break;
|
|
case 8:
|
|
loc_call(JAZZ_PARALLEL_IRQ, JAZZ_IE_FLOPPY);
|
|
break;
|
|
case 12:
|
|
panic("Unimplemented loc_sound handler");
|
|
break;
|
|
case 16:
|
|
panic("Unimplemented loc_video handler");
|
|
break;
|
|
case 20:
|
|
loc_call(JAZZ_ETHERNET_IRQ, JAZZ_IE_ETHERNET);
|
|
break;
|
|
case 24:
|
|
loc_call(JAZZ_SCSI_IRQ, JAZZ_IE_SCSI);
|
|
break;
|
|
case 28:
|
|
loc_call(JAZZ_KEYBOARD_IRQ, JAZZ_IE_KEYBOARD);
|
|
break;
|
|
case 32:
|
|
loc_call(JAZZ_MOUSE_IRQ, JAZZ_IE_MOUSE);
|
|
break;
|
|
case 36:
|
|
loc_call(JAZZ_SERIAL1_IRQ, JAZZ_IE_SERIAL1);
|
|
break;
|
|
case 40:
|
|
loc_call(JAZZ_SERIAL2_IRQ, JAZZ_IE_SERIAL2);
|
|
break;
|
|
}
|
|
}
|
|
|
|
asmlinkage void plat_irq_dispatch(void)
|
|
{
|
|
unsigned int pending = read_c0_cause() & read_c0_status();
|
|
|
|
if (pending & IE_IRQ5)
|
|
write_c0_compare(0);
|
|
else if (pending & IE_IRQ4) {
|
|
r4030_read_reg32(JAZZ_TIMER_REGISTER);
|
|
do_IRQ(JAZZ_TIMER_IRQ);
|
|
} else if (pending & IE_IRQ3)
|
|
panic("Unimplemented ISA NMI handler");
|
|
else if (pending & IE_IRQ2)
|
|
do_IRQ(r4030_read_reg32(JAZZ_EISA_IRQ_ACK));
|
|
else if (pending & IE_IRQ1) {
|
|
ll_local_dev();
|
|
} else if (unlikely(pending & IE_IRQ0))
|
|
panic("Unimplemented local_dma handler");
|
|
else if (pending & IE_SW1) {
|
|
clear_c0_cause(IE_SW1);
|
|
panic("Unimplemented sw1 handler");
|
|
} else if (pending & IE_SW0) {
|
|
clear_c0_cause(IE_SW0);
|
|
panic("Unimplemented sw0 handler");
|
|
}
|
|
}
|