arch/mips/loongson64/loongson-3/irq.c

   1 #include <loongson.h>
   2 #include <irq.h>
   3 #include <linux/interrupt.h>
   4 #include <linux/module.h>
   5
   6 #include <asm/irq_cpu.h>
   7 #include <asm/i8259.h>
   8 #include <asm/mipsregs.h>
   9
  10 #include "smp.h"
  11
  12 unsigned int ht_irq[] = {0, 1, 3, 4, 5, 6, 7, 8, 12, 14, 15};
  13
  14 static void ht_irqdispatch(void)
  15 {
  16         unsigned int i, irq;
  17
  18         irq = LOONGSON_HT1_INT_VECTOR(0);
  19         LOONGSON_HT1_INT_VECTOR(0) = irq; /* Acknowledge the IRQs */
  20
  21         for (i = 0; i < ARRAY_SIZE(ht_irq); i++) {
  22                 if (irq & (0x1 << ht_irq[i]))
  23                         do_IRQ(ht_irq[i]);
  24         }
  25 }
  26
  27 #define UNUSED_IPS (CAUSEF_IP5 | CAUSEF_IP4 | CAUSEF_IP1 | CAUSEF_IP0)
  28
  29 void mach_irq_dispatch(unsigned int pending)
  30 {
  31         if (pending & CAUSEF_IP7)
  32                 do_IRQ(LOONGSON_TIMER_IRQ);
  33 #if defined(CONFIG_SMP)
  34         if (pending & CAUSEF_IP6)
  35                 loongson3_ipi_interrupt(NULL);
  36 #endif
  37         if (pending & CAUSEF_IP3)
  38                 ht_irqdispatch();
  39         if (pending & CAUSEF_IP2)
  40                 do_IRQ(LOONGSON_UART_IRQ);
  41         if (pending & UNUSED_IPS) {
  42                 pr_err("%s : spurious interrupt\n", __func__);
  43                 spurious_interrupt();
  44         }
  45 }
  46
  47 static inline void mask_loongson_irq(struct irq_data *d) { }
  48 static inline void unmask_loongson_irq(struct irq_data *d) { }
  49
  50  /* For MIPS IRQs which shared by all cores */
  51 static struct irq_chip loongson_irq_chip = {
  52         .name           = "Loongson",
  53         .irq_ack        = mask_loongson_irq,
  54         .irq_mask       = mask_loongson_irq,
  55         .irq_mask_ack   = mask_loongson_irq,
  56         .irq_unmask     = unmask_loongson_irq,
  57         .irq_eoi        = unmask_loongson_irq,
  58 };
  59
  60 void irq_router_init(void)
  61 {
  62         int i;
  63
  64         /* route LPC int to cpu core0 int 0 */
  65         LOONGSON_INT_ROUTER_LPC =
  66                 LOONGSON_INT_COREx_INTy(loongson_sysconf.boot_cpu_id, 0);
  67         /* route HT1 int0 ~ int7 to cpu core0 INT1*/
  68         for (i = 0; i < 8; i++)
  69                 LOONGSON_INT_ROUTER_HT1(i) =
  70                         LOONGSON_INT_COREx_INTy(loongson_sysconf.boot_cpu_id, 1);
  71         /* enable HT1 interrupt */
  72         LOONGSON_HT1_INTN_EN(0) = 0xffffffff;
  73         /* enable router interrupt intenset */
  74         LOONGSON_INT_ROUTER_INTENSET =
  75                 LOONGSON_INT_ROUTER_INTEN | (0xffff << 16) | 0x1 << 10;
  76 }
  77
  78 void __init mach_init_irq(void)
  79 {
  80         clear_c0_status(ST0_IM | ST0_BEV);
  81
  82         irq_router_init();
  83         mips_cpu_irq_init();
  84         init_i8259_irqs();
  85         irq_set_chip_and_handler(LOONGSON_UART_IRQ,
  86                         &loongson_irq_chip, handle_percpu_irq);
  87         irq_set_chip_and_handler(LOONGSON_BRIDGE_IRQ,
  88                         &loongson_irq_chip, handle_percpu_irq);
  89
  90         set_c0_status(STATUSF_IP2 | STATUSF_IP3 | STATUSF_IP6);
  91 }
  92
  93 #ifdef CONFIG_HOTPLUG_CPU
  94
  95 void fixup_irqs(void)
  96 {
  97         irq_cpu_offline();
  98         clear_c0_status(ST0_IM);
  99 }
 100
 101 #endif