hw/intc/m68k_irqc.c

   1 /*
   2  * SPDX-License-Identifer: GPL-2.0-or-later
   3  *
   4  * QEMU Motorola 680x0 IRQ Controller
   5  *
   6  * (c) 2020 Laurent Vivier <laurent@vivier.eu>
   7  *
   8  */
   9
  10 #include "qemu/osdep.h"
  11 #include "cpu.h"
  12 #include "migration/vmstate.h"
  13 #include "monitor/monitor.h"
  14 #include "hw/nmi.h"
  15 #include "hw/intc/intc.h"
  16 #include "hw/intc/m68k_irqc.h"
  17
  18
  19 static bool m68k_irqc_get_statistics(InterruptStatsProvider *obj,
  20                                      uint64_t **irq_counts, unsigned int *nb_irqs)
  21 {
  22     M68KIRQCState *s = M68K_IRQC(obj);
  23
  24     *irq_counts = s->stats_irq_count;
  25     *nb_irqs = ARRAY_SIZE(s->stats_irq_count);
  26     return true;
  27 }
  28
  29 static void m68k_irqc_print_info(InterruptStatsProvider *obj, Monitor *mon)
  30 {
  31     M68KIRQCState *s = M68K_IRQC(obj);
  32     monitor_printf(mon, "m68k-irqc: ipr=0x%x\n", s->ipr);
  33 }
  34
  35 static void m68k_set_irq(void *opaque, int irq, int level)
  36 {
  37     M68KIRQCState *s = opaque;
  38     M68kCPU *cpu = M68K_CPU(first_cpu);
  39     int i;
  40
  41     if (level) {
  42         s->ipr |= 1 << irq;
  43         s->stats_irq_count[irq]++;
  44     } else {
  45         s->ipr &= ~(1 << irq);
  46     }
  47
  48     for (i = M68K_IRQC_LEVEL_7; i >= M68K_IRQC_LEVEL_1; i--) {
  49         if ((s->ipr >> i) & 1) {
  50             m68k_set_irq_level(cpu, i + 1, i + M68K_IRQC_AUTOVECTOR_BASE);
  51             return;
  52         }
  53     }
  54     m68k_set_irq_level(cpu, 0, 0);
  55 }
  56
  57 static void m68k_irqc_reset(DeviceState *d)
  58 {
  59     M68KIRQCState *s = M68K_IRQC(d);
  60     int i;
  61
  62     s->ipr = 0;
  63     for (i = 0; i < ARRAY_SIZE(s->stats_irq_count); i++) {
  64         s->stats_irq_count[i] = 0;
  65     }
  66 }
  67
  68 static void m68k_irqc_instance_init(Object *obj)
  69 {
  70     qdev_init_gpio_in(DEVICE(obj), m68k_set_irq, M68K_IRQC_LEVEL_NUM);
  71 }
  72
  73 static void m68k_nmi(NMIState *n, int cpu_index, Error **errp)
  74 {
  75     m68k_set_irq(n, M68K_IRQC_LEVEL_7, 1);
  76 }
  77
  78 static const VMStateDescription vmstate_m68k_irqc = {
  79     .name = "m68k-irqc",
  80     .version_id = 1,
  81     .minimum_version_id = 1,
  82     .fields = (VMStateField[]) {
  83         VMSTATE_UINT8(ipr, M68KIRQCState),
  84         VMSTATE_END_OF_LIST()
  85     }
  86 };
  87
  88 static void m68k_irqc_class_init(ObjectClass *oc, void *data)
  89  {
  90     DeviceClass *dc = DEVICE_CLASS(oc);
  91     NMIClass *nc = NMI_CLASS(oc);
  92     InterruptStatsProviderClass *ic = INTERRUPT_STATS_PROVIDER_CLASS(oc);
  93
  94     nc->nmi_monitor_handler = m68k_nmi;
  95     dc->reset = m68k_irqc_reset;
  96     dc->vmsd = &vmstate_m68k_irqc;
  97     ic->get_statistics = m68k_irqc_get_statistics;
  98     ic->print_info = m68k_irqc_print_info;
  99 }
 100
 101 static const TypeInfo m68k_irqc_type_info = {
 102     .name = TYPE_M68K_IRQC,
 103     .parent = TYPE_SYS_BUS_DEVICE,
 104     .instance_size = sizeof(M68KIRQCState),
 105     .instance_init = m68k_irqc_instance_init,
 106     .class_init = m68k_irqc_class_init,
 107     .interfaces = (InterfaceInfo[]) {
 108          { TYPE_NMI },
 109          { TYPE_INTERRUPT_STATS_PROVIDER },
 110          { }
 111     },
 112 };
 113
 114 static void q800_irq_register_types(void)
 115 {
 116     type_register_static(&m68k_irqc_type_info);
 117 }
 118
 119 type_init(q800_irq_register_types);