mirror of https://gitee.com/openkylin/linux.git
146 lines
3.6 KiB
C
146 lines
3.6 KiB
C
#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>
|
|
|
|
#include "smp.h"
|
|
|
|
unsigned int ht_irq[] = {0, 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]);
|
|
}
|
|
}
|
|
|
|
#define UNUSED_IPS (CAUSEF_IP5 | CAUSEF_IP4 | CAUSEF_IP1 | CAUSEF_IP0)
|
|
|
|
void mach_irq_dispatch(unsigned int pending)
|
|
{
|
|
if (pending & CAUSEF_IP7)
|
|
do_IRQ(LOONGSON_TIMER_IRQ);
|
|
#if defined(CONFIG_SMP)
|
|
if (pending & CAUSEF_IP6)
|
|
loongson3_ipi_interrupt(NULL);
|
|
#endif
|
|
if (pending & CAUSEF_IP3)
|
|
ht_irqdispatch();
|
|
if (pending & CAUSEF_IP2)
|
|
do_IRQ(LOONGSON_UART_IRQ);
|
|
if (pending & UNUSED_IPS) {
|
|
pr_err("%s : spurious interrupt\n", __func__);
|
|
spurious_interrupt();
|
|
}
|
|
}
|
|
|
|
static struct irqaction cascade_irqaction = {
|
|
.handler = no_action,
|
|
.flags = IRQF_NO_SUSPEND,
|
|
.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();
|
|
int node_id = cpu_logical_map(cpu) / loongson_sysconf.cores_per_node;
|
|
int core_id = cpu_logical_map(cpu) % loongson_sysconf.cores_per_node;
|
|
u64 intenclr_addr = smp_group[node_id] |
|
|
(u64)(&LOONGSON_INT_ROUTER_INTENCLR);
|
|
u64 introuter_lpc_addr = smp_group[node_id] |
|
|
(u64)(&LOONGSON_INT_ROUTER_LPC);
|
|
|
|
*(volatile u32 *)intenclr_addr = 1 << 10;
|
|
*(volatile u8 *)introuter_lpc_addr = 0x10 + (1<<core_id);
|
|
}
|
|
}
|
|
|
|
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();
|
|
int node_id = cpu_logical_map(cpu) / loongson_sysconf.cores_per_node;
|
|
int core_id = cpu_logical_map(cpu) % loongson_sysconf.cores_per_node;
|
|
u64 intenset_addr = smp_group[node_id] |
|
|
(u64)(&LOONGSON_INT_ROUTER_INTENSET);
|
|
u64 introuter_lpc_addr = smp_group[node_id] |
|
|
(u64)(&LOONGSON_INT_ROUTER_LPC);
|
|
|
|
*(volatile u32 *)intenset_addr = 1 << 10;
|
|
*(volatile u8 *)introuter_lpc_addr = 0x10 + (1<<core_id);
|
|
}
|
|
|
|
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_COREx_INTy(loongson_sysconf.boot_cpu_id, 0);
|
|
/* route HT1 int0 ~ int7 to cpu core0 INT1*/
|
|
for (i = 0; i < 8; i++)
|
|
LOONGSON_INT_ROUTER_HT1(i) =
|
|
LOONGSON_INT_COREx_INTy(loongson_sysconf.boot_cpu_id, 1);
|
|
/* 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);
|
|
}
|
|
|
|
#ifdef CONFIG_HOTPLUG_CPU
|
|
|
|
void fixup_irqs(void)
|
|
{
|
|
irq_cpu_offline();
|
|
clear_c0_status(ST0_IM);
|
|
}
|
|
|
|
#endif
|