hw/intc/puv3_intc.c

   1 /*
   2  * INTC device simulation in PKUnity SoC
   3  *
   4  * Copyright (C) 2010-2012 Guan Xuetao
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License version 2 as
   8  * published by the Free Software Foundation, or any later version.
   9  * See the COPYING file in the top-level directory.
  10  */
  11 #include "qemu/osdep.h"
  12 #include "hw/sysbus.h"
  13
  14 #undef DEBUG_PUV3
  15 #include "hw/unicore32/puv3.h"
  16
  17 #define TYPE_PUV3_INTC "puv3_intc"
  18 #define PUV3_INTC(obj) OBJECT_CHECK(PUV3INTCState, (obj), TYPE_PUV3_INTC)
  19
  20 typedef struct PUV3INTCState {
  21     SysBusDevice parent_obj;
  22
  23     MemoryRegion iomem;
  24     qemu_irq parent_irq;
  25
  26     uint32_t reg_ICMR;
  27     uint32_t reg_ICPR;
  28 } PUV3INTCState;
  29
  30 /* Update interrupt status after enabled or pending bits have been changed.  */
  31 static void puv3_intc_update(PUV3INTCState *s)
  32 {
  33     if (s->reg_ICMR & s->reg_ICPR) {
  34         qemu_irq_raise(s->parent_irq);
  35     } else {
  36         qemu_irq_lower(s->parent_irq);
  37     }
  38 }
  39
  40 /* Process a change in an external INTC input. */
  41 static void puv3_intc_handler(void *opaque, int irq, int level)
  42 {
  43     PUV3INTCState *s = opaque;
  44
  45     DPRINTF("irq 0x%x, level 0x%x\n", irq, level);
  46     if (level) {
  47         s->reg_ICPR |= (1 << irq);
  48     } else {
  49         s->reg_ICPR &= ~(1 << irq);
  50     }
  51     puv3_intc_update(s);
  52 }
  53
  54 static uint64_t puv3_intc_read(void *opaque, hwaddr offset,
  55         unsigned size)
  56 {
  57     PUV3INTCState *s = opaque;
  58     uint32_t ret = 0;
  59
  60     switch (offset) {
  61     case 0x04: /* INTC_ICMR */
  62         ret = s->reg_ICMR;
  63         break;
  64     case 0x0c: /* INTC_ICIP */
  65         ret = s->reg_ICPR; /* the same value with ICPR */
  66         break;
  67     default:
  68         DPRINTF("Bad offset %x\n", (int)offset);
  69     }
  70     DPRINTF("offset 0x%x, value 0x%x\n", offset, ret);
  71     return ret;
  72 }
  73
  74 static void puv3_intc_write(void *opaque, hwaddr offset,
  75         uint64_t value, unsigned size)
  76 {
  77     PUV3INTCState *s = opaque;
  78
  79     DPRINTF("offset 0x%x, value 0x%x\n", offset, value);
  80     switch (offset) {
  81     case 0x00: /* INTC_ICLR */
  82     case 0x14: /* INTC_ICCR */
  83         break;
  84     case 0x04: /* INTC_ICMR */
  85         s->reg_ICMR = value;
  86         break;
  87     default:
  88         DPRINTF("Bad offset 0x%x\n", (int)offset);
  89         return;
  90     }
  91     puv3_intc_update(s);
  92 }
  93
  94 static const MemoryRegionOps puv3_intc_ops = {
  95     .read = puv3_intc_read,
  96     .write = puv3_intc_write,
  97     .impl = {
  98         .min_access_size = 4,
  99         .max_access_size = 4,
 100     },
 101     .endianness = DEVICE_NATIVE_ENDIAN,
 102 };
 103
 104 static int puv3_intc_init(SysBusDevice *sbd)
 105 {
 106     DeviceState *dev = DEVICE(sbd);
 107     PUV3INTCState *s = PUV3_INTC(dev);
 108
 109     qdev_init_gpio_in(dev, puv3_intc_handler, PUV3_IRQS_NR);
 110     sysbus_init_irq(sbd, &s->parent_irq);
 111
 112     s->reg_ICMR = 0;
 113     s->reg_ICPR = 0;
 114
 115     memory_region_init_io(&s->iomem, OBJECT(s), &puv3_intc_ops, s, "puv3_intc",
 116                           PUV3_REGS_OFFSET);
 117     sysbus_init_mmio(sbd, &s->iomem);
 118
 119     return 0;
 120 }
 121
 122 static void puv3_intc_class_init(ObjectClass *klass, void *data)
 123 {
 124     SysBusDeviceClass *sdc = SYS_BUS_DEVICE_CLASS(klass);
 125
 126     sdc->init = puv3_intc_init;
 127 }
 128
 129 static const TypeInfo puv3_intc_info = {
 130     .name = TYPE_PUV3_INTC,
 131     .parent = TYPE_SYS_BUS_DEVICE,
 132     .instance_size = sizeof(PUV3INTCState),
 133     .class_init = puv3_intc_class_init,
 134 };
 135
 136 static void puv3_intc_register_type(void)
 137 {
 138     type_register_static(&puv3_intc_info);
 139 }
 140
 141 type_init(puv3_intc_register_type)