hw/intc/heathrow_pic.c

   1 /*
   2  * Heathrow PIC support (OldWorld PowerMac)
   3  *
   4  * Copyright (c) 2005-2007 Fabrice Bellard
   5  * Copyright (c) 2007 Jocelyn Mayer
   6  *
   7  * Permission is hereby granted, free of charge, to any person obtaining a copy
   8  * of this software and associated documentation files (the "Software"), to deal
   9  * in the Software without restriction, including without limitation the rights
  10  * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
  11  * copies of the Software, and to permit persons to whom the Software is
  12  * furnished to do so, subject to the following conditions:
  13  *
  14  * The above copyright notice and this permission notice shall be included in
  15  * all copies or substantial portions of the Software.
  16  *
  17  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  18  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  19  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
  20  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  21  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
  22  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
  23  * THE SOFTWARE.
  24  */
  25 #include "qemu/osdep.h"
  26 #include "hw/hw.h"
  27 #include "hw/ppc/mac.h"
  28 #include "hw/intc/heathrow_pic.h"
  29 #include "trace.h"
  30
  31 static inline int heathrow_check_irq(HeathrowPICState *pic)
  32 {
  33     return (pic->events | (pic->levels & pic->level_triggered)) & pic->mask;
  34 }
  35
  36 /* update the CPU irq state */
  37 static void heathrow_update_irq(HeathrowState *s)
  38 {
  39     if (heathrow_check_irq(&s->pics[0]) ||
  40             heathrow_check_irq(&s->pics[1])) {
  41         qemu_irq_raise(s->irqs[0]);
  42     } else {
  43         qemu_irq_lower(s->irqs[0]);
  44     }
  45 }
  46
  47 static void heathrow_write(void *opaque, hwaddr addr,
  48                            uint64_t value, unsigned size)
  49 {
  50     HeathrowState *s = opaque;
  51     HeathrowPICState *pic;
  52     unsigned int n;
  53
  54     n = ((addr & 0xfff) - 0x10) >> 4;
  55     trace_heathrow_write(addr, n, value);
  56     if (n >= 2)
  57         return;
  58     pic = &s->pics[n];
  59     switch(addr & 0xf) {
  60     case 0x04:
  61         pic->mask = value;
  62         heathrow_update_irq(s);
  63         break;
  64     case 0x08:
  65         /* do not reset level triggered IRQs */
  66         value &= ~pic->level_triggered;
  67         pic->events &= ~value;
  68         heathrow_update_irq(s);
  69         break;
  70     default:
  71         break;
  72     }
  73 }
  74
  75 static uint64_t heathrow_read(void *opaque, hwaddr addr,
  76                               unsigned size)
  77 {
  78     HeathrowState *s = opaque;
  79     HeathrowPICState *pic;
  80     unsigned int n;
  81     uint32_t value;
  82
  83     n = ((addr & 0xfff) - 0x10) >> 4;
  84     if (n >= 2) {
  85         value = 0;
  86     } else {
  87         pic = &s->pics[n];
  88         switch(addr & 0xf) {
  89         case 0x0:
  90             value = pic->events;
  91             break;
  92         case 0x4:
  93             value = pic->mask;
  94             break;
  95         case 0xc:
  96             value = pic->levels;
  97             break;
  98         default:
  99             value = 0;
 100             break;
 101         }
 102     }
 103     trace_heathrow_read(addr, n, value);
 104     return value;
 105 }
 106
 107 static const MemoryRegionOps heathrow_ops = {
 108     .read = heathrow_read,
 109     .write = heathrow_write,
 110     .endianness = DEVICE_LITTLE_ENDIAN,
 111 };
 112
 113 static void heathrow_set_irq(void *opaque, int num, int level)
 114 {
 115     HeathrowState *s = opaque;
 116     HeathrowPICState *pic;
 117     unsigned int irq_bit;
 118     int last_level;
 119
 120     pic = &s->pics[1 - (num >> 5)];
 121     irq_bit = 1 << (num & 0x1f);
 122     last_level = (pic->levels & irq_bit) ? 1 : 0;
 123
 124     if (level) {
 125         pic->events |= irq_bit & ~pic->level_triggered;
 126         pic->levels |= irq_bit;
 127     } else {
 128         pic->levels &= ~irq_bit;
 129     }
 130
 131     if (last_level != level) {
 132         trace_heathrow_set_irq(num, level);
 133     }
 134
 135     heathrow_update_irq(s);
 136 }
 137
 138 static const VMStateDescription vmstate_heathrow_pic_one = {
 139     .name = "heathrow_pic_one",
 140     .version_id = 0,
 141     .minimum_version_id = 0,
 142     .fields = (VMStateField[]) {
 143         VMSTATE_UINT32(events, HeathrowPICState),
 144         VMSTATE_UINT32(mask, HeathrowPICState),
 145         VMSTATE_UINT32(levels, HeathrowPICState),
 146         VMSTATE_UINT32(level_triggered, HeathrowPICState),
 147         VMSTATE_END_OF_LIST()
 148     }
 149 };
 150
 151 static const VMStateDescription vmstate_heathrow = {
 152     .name = "heathrow_pic",
 153     .version_id = 1,
 154     .minimum_version_id = 1,
 155     .fields = (VMStateField[]) {
 156         VMSTATE_STRUCT_ARRAY(pics, HeathrowState, 2, 1,
 157                              vmstate_heathrow_pic_one, HeathrowPICState),
 158         VMSTATE_END_OF_LIST()
 159     }
 160 };
 161
 162 static void heathrow_reset(DeviceState *d)
 163 {
 164     HeathrowState *s = HEATHROW(d);
 165
 166     s->pics[0].level_triggered = 0;
 167     s->pics[1].level_triggered = 0x1ff00000;
 168 }
 169
 170 static void heathrow_init(Object *obj)
 171 {
 172     HeathrowState *s = HEATHROW(obj);
 173     SysBusDevice *sbd = SYS_BUS_DEVICE(obj);
 174
 175     /* only 1 CPU */
 176     qdev_init_gpio_out(DEVICE(obj), s->irqs, 1);
 177
 178     qdev_init_gpio_in(DEVICE(obj), heathrow_set_irq, HEATHROW_NUM_IRQS);
 179
 180     memory_region_init_io(&s->mem, OBJECT(s), &heathrow_ops, s,
 181                           "heathrow-pic", 0x1000);
 182     sysbus_init_mmio(sbd, &s->mem);
 183 }
 184
 185 static void heathrow_class_init(ObjectClass *oc, void *data)
 186 {
 187     DeviceClass *dc = DEVICE_CLASS(oc);
 188
 189     dc->reset = heathrow_reset;
 190     dc->vmsd = &vmstate_heathrow;
 191     set_bit(DEVICE_CATEGORY_MISC, dc->categories);
 192 }
 193
 194 static const TypeInfo heathrow_type_info = {
 195     .name = TYPE_HEATHROW,
 196     .parent = TYPE_SYS_BUS_DEVICE,
 197     .instance_size = sizeof(HeathrowState),
 198     .instance_init = heathrow_init,
 199     .class_init = heathrow_class_init,
 200 };
 201
 202 static void heathrow_register_types(void)
 203 {
 204     type_register_static(&heathrow_type_info);
 205 }
 206
 207 type_init(heathrow_register_types)