void enable_irq(unsigned int irq_nr)
{
if (is_i8259_irq(irq_nr))
i8259_enable_irq(irq_nr);
else
nile4_enable_irq(irq_to_nile4(irq_nr));
}
static void __init ddb_time_init(struct irqaction *irq)
{
/* set the clock to 1 Hz */
nile4_out32(NILE4_T2CTRL, 1000000);
/* enable the General-Purpose Timer */
nile4_out32(NILE4_T2CTRL + 4, 0x00000001);
/* reset timer */
nile4_out32(NILE4_T2CNTR, 0);
/* enable interrupt */
nile4_enable_irq(NILE4_INT_GPT);
i8259_setup_irq(nile4_to_irq(NILE4_INT_GPT), irq);
change_cp0_status(ST0_IM,
IE_IRQ0 | IE_IRQ1 | IE_IRQ2 | IE_IRQ3 | IE_IRQ4);
}
void ddb_local0_irqdispatch(struct pt_regs *regs)
{
u32 mask;
int nile4_irq;
#if 1
volatile static int nesting = 0;
if (nesting++ == 0)
ddb5074_led_d3(1);
ddb5074_led_hex(nesting < 16 ? nesting : 15);
#endif
mask = nile4_get_irq_stat(0);
nile4_clear_irq_mask(mask);
/* Handle the timer interrupt first */
if (mask & (1 << NILE4_INT_GPT)) {
nile4_disable_irq(NILE4_INT_GPT);
do_IRQ(nile4_to_irq(NILE4_INT_GPT), regs);
nile4_enable_irq(NILE4_INT_GPT);
mask &= ~(1 << NILE4_INT_GPT);
}
for (nile4_irq = 0; mask; nile4_irq++, mask >>= 1)
if (mask & 1) {
nile4_disable_irq(nile4_irq);
if (nile4_irq == NILE4_INT_INTE) {
int i8259_irq = nile4_i8259_iack();
i8259_do_irq(i8259_irq, regs);
} else
do_IRQ(nile4_to_irq(nile4_irq), regs);
nile4_enable_irq(nile4_irq);
}
#if 1
if (--nesting == 0)
ddb5074_led_d3(0);
ddb5074_led_hex(nesting < 16 ? nesting : 15);
#endif
}
static void m1543_irq_setup(void)
{
/*
* The ALI M1543 has 13 interrupt inputs, IRQ1..IRQ13. Not all
* the possible IO sources in the M1543 are in use by us. We will
* use the following mapping:
*
* IRQ1 - keyboard (default set by M1543)
* IRQ3 - reserved for UART B (default set by M1543) (note that
* the schematics for the DDB Vrc-5074 board seem to
* indicate that IRQ3 is connected to the DS1386
* watchdog timer interrupt output so we might have
* a conflict)
* IRQ4 - reserved for UART A (default set by M1543)
* IRQ5 - parallel (default set by M1543)
* IRQ8 - DS1386 time of day (RTC) interrupt
* IRQ12 - mouse
*/
/*
* Assing mouse interrupt to IRQ12
*/
/* Enter configuration mode */
outb(0x51, M1543_PNP_CONFIG);
outb(0x23, M1543_PNP_CONFIG);
/* Select logical device 7 (Keyboard) */
outb(0x07, M1543_PNP_INDEX);
outb(0x07, M1543_PNP_DATA);
/* Select IRQ12 */
outb(0x72, M1543_PNP_INDEX);
outb(0x0c, M1543_PNP_DATA);
/* Leave configration mode */
outb(0xbb, M1543_PNP_CONFIG);
/* Initialize the 8259 PIC in the M1543 */
i8259_init();
/* Enable the interrupt cascade */
nile4_enable_irq(NILE4_INT_INTE);
request_region(M1543_PNP_CONFIG, 2, "M1543 config");
request_region(M1543_INT1_MASTER_ELCR, 2, "pic ELCR");
}
void __init arch_init_irq(void)
{
/* setup cascade interrupts */
setup_irq(NILE4_IRQ_BASE + NILE4_INT_INTE, &irq_cascade);
setup_irq(CPU_IRQ_BASE + CPU_NILE4_CASCADE, &irq_cascade);
set_except_vector(0, ddbIRQ);
nile4_irq_setup(NILE4_IRQ_BASE);
m1543_irq_setup();
init_i8259_irqs();
printk("CPU_IRQ_BASE: %d\n",CPU_IRQ_BASE);
mips_cpu_irq_init(CPU_IRQ_BASE);
printk("enabling 8259 cascade\n");
ddb5074_led_hex(0);
/* Enable the interrupt cascade */
nile4_enable_irq(NILE4_IRQ_BASE+IRQ_I8259_CASCADE);
}
static unsigned int vrc5476_irq_startup(uint irq)
{
nile4_enable_irq(irq - irq_base);
return 0;
}
static void vrc5476_irq_enable(uint irq)
{
nile4_enable_irq(irq - irq_base);
}
