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#include <loongson.h>
#include <irq.h>
#include <linux/interrupt.h>
#include <linux/module.h>
#include <asm/irq_cpu.h>
#include <asm/i8259.h>
#include <asm/mipsregs.h>
unsigned int ht_irq[] = {1, 3, 4, 5, 6, 7, 8, 12, 14, 15};
static void ht_irqdispatch(void)
{
unsigned int i, irq;
irq = LOONGSON_HT1_INT_VECTOR(0);
LOONGSON_HT1_INT_VECTOR(0) = irq; /* Acknowledge the IRQs */
for (i = 0; i < ARRAY_SIZE(ht_irq); i++) {
if (irq & (0x1 << ht_irq[i]))
do_IRQ(ht_irq[i]);
}
}
void mach_irq_dispatch(unsigned int pending)
{
if (pending & CAUSEF_IP7)
do_IRQ(LOONGSON_TIMER_IRQ);
#if defined(CONFIG_SMP)
else if (pending & CAUSEF_IP6)
loongson3_ipi_interrupt(NULL);
#endif
else if (pending & CAUSEF_IP3)
ht_irqdispatch();
else if (pending & CAUSEF_IP2)
do_IRQ(LOONGSON_UART_IRQ);
else {
pr_err("%s : spurious interrupt\n", __func__);
spurious_interrupt();
}
}
static struct irqaction cascade_irqaction = {
.handler = no_action,
.name = "cascade",
};
static inline void mask_loongson_irq(struct irq_data *d)
{
clear_c0_status(0x100 << (d->irq - MIPS_CPU_IRQ_BASE));
irq_disable_hazard();
/* Workaround: UART IRQ may deliver to any core */
if (d->irq == LOONGSON_UART_IRQ) {
int cpu = smp_processor_id();
LOONGSON_INT_ROUTER_INTENCLR = 1 << 10;
LOONGSON_INT_ROUTER_LPC = 0x10 + (1<<cpu);
}
}
static inline void unmask_loongson_irq(struct irq_data *d)
{
/* Workaround: UART IRQ may deliver to any core */
if (d->irq == LOONGSON_UART_IRQ) {
int cpu = smp_processor_id();
LOONGSON_INT_ROUTER_INTENSET = 1 << 10;
LOONGSON_INT_ROUTER_LPC = 0x10 + (1<<cpu);
}
set_c0_status(0x100 << (d->irq - MIPS_CPU_IRQ_BASE));
irq_enable_hazard();
}
/* For MIPS IRQs which shared by all cores */
static struct irq_chip loongson_irq_chip = {
.name = "Loongson",
.irq_ack = mask_loongson_irq,
.irq_mask = mask_loongson_irq,
.irq_mask_ack = mask_loongson_irq,
.irq_unmask = unmask_loongson_irq,
.irq_eoi = unmask_loongson_irq,
};
void irq_router_init(void)
{
int i;
/* route LPC int to cpu core0 int 0 */
LOONGSON_INT_ROUTER_LPC = LOONGSON_INT_CORE0_INT0;
/* route HT1 int0 ~ int7 to cpu core0 INT1*/
for (i = 0; i < 8; i++)
LOONGSON_INT_ROUTER_HT1(i) = LOONGSON_INT_CORE0_INT1;
/* enable HT1 interrupt */
LOONGSON_HT1_INTN_EN(0) = 0xffffffff;
/* enable router interrupt intenset */
LOONGSON_INT_ROUTER_INTENSET =
LOONGSON_INT_ROUTER_INTEN | (0xffff << 16) | 0x1 << 10;
}
void __init mach_init_irq(void)
{
clear_c0_status(ST0_IM | ST0_BEV);
irq_router_init();
mips_cpu_irq_init();
init_i8259_irqs();
irq_set_chip_and_handler(LOONGSON_UART_IRQ,
&loongson_irq_chip, handle_level_irq);
/* setup HT1 irq */
setup_irq(LOONGSON_HT1_IRQ, &cascade_irqaction);
set_c0_status(STATUSF_IP2 | STATUSF_IP6);
}
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