hw/intc/lm32_pic.c

   1 /*
   2  *  LatticeMico32 CPU interrupt controller logic.
   3  *
   4  *  Copyright (c) 2010 Michael Walle <michael@walle.cc>
   5  *
   6  * This library is free software; you can redistribute it and/or
   7  * modify it under the terms of the GNU Lesser General Public
   8  * License as published by the Free Software Foundation; either
   9  * version 2 of the License, or (at your option) any later version.
  10  *
  11  * This library is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14  * Lesser General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU Lesser General Public
  17  * License along with this library; if not, see <http://www.gnu.org/licenses/>.
  18  */
  19
  20 #include "qemu/osdep.h"
  21
  22 #include "migration/vmstate.h"
  23 #include "monitor/monitor.h"
  24 #include "qemu/module.h"
  25 #include "hw/sysbus.h"
  26 #include "trace.h"
  27 #include "hw/lm32/lm32_pic.h"
  28 #include "hw/intc/intc.h"
  29 #include "hw/irq.h"
  30
  31 #define TYPE_LM32_PIC "lm32-pic"
  32 #define LM32_PIC(obj) OBJECT_CHECK(LM32PicState, (obj), TYPE_LM32_PIC)
  33
  34 struct LM32PicState {
  35     SysBusDevice parent_obj;
  36
  37     qemu_irq parent_irq;
  38     uint32_t im;        /* interrupt mask */
  39     uint32_t ip;        /* interrupt pending */
  40     uint32_t irq_state;
  41
  42     /* statistics */
  43     uint64_t stats_irq_count[32];
  44 };
  45 typedef struct LM32PicState LM32PicState;
  46
  47 static void update_irq(LM32PicState *s)
  48 {
  49     s->ip |= s->irq_state;
  50
  51     if (s->ip & s->im) {
  52         trace_lm32_pic_raise_irq();
  53         qemu_irq_raise(s->parent_irq);
  54     } else {
  55         trace_lm32_pic_lower_irq();
  56         qemu_irq_lower(s->parent_irq);
  57     }
  58 }
  59
  60 static void irq_handler(void *opaque, int irq, int level)
  61 {
  62     LM32PicState *s = opaque;
  63
  64     assert(irq < 32);
  65     trace_lm32_pic_interrupt(irq, level);
  66
  67     if (level) {
  68         s->irq_state |= (1 << irq);
  69         s->stats_irq_count[irq]++;
  70     } else {
  71         s->irq_state &= ~(1 << irq);
  72     }
  73
  74     update_irq(s);
  75 }
  76
  77 void lm32_pic_set_im(DeviceState *d, uint32_t im)
  78 {
  79     LM32PicState *s = LM32_PIC(d);
  80
  81     trace_lm32_pic_set_im(im);
  82     s->im = im;
  83
  84     update_irq(s);
  85 }
  86
  87 void lm32_pic_set_ip(DeviceState *d, uint32_t ip)
  88 {
  89     LM32PicState *s = LM32_PIC(d);
  90
  91     trace_lm32_pic_set_ip(ip);
  92
  93     /* ack interrupt */
  94     s->ip &= ~ip;
  95
  96     update_irq(s);
  97 }
  98
  99 uint32_t lm32_pic_get_im(DeviceState *d)
 100 {
 101     LM32PicState *s = LM32_PIC(d);
 102
 103     trace_lm32_pic_get_im(s->im);
 104     return s->im;
 105 }
 106
 107 uint32_t lm32_pic_get_ip(DeviceState *d)
 108 {
 109     LM32PicState *s = LM32_PIC(d);
 110
 111     trace_lm32_pic_get_ip(s->ip);
 112     return s->ip;
 113 }
 114
 115 static void pic_reset(DeviceState *d)
 116 {
 117     LM32PicState *s = LM32_PIC(d);
 118     int i;
 119
 120     s->im = 0;
 121     s->ip = 0;
 122     s->irq_state = 0;
 123     for (i = 0; i < 32; i++) {
 124         s->stats_irq_count[i] = 0;
 125     }
 126 }
 127
 128 static bool lm32_get_statistics(InterruptStatsProvider *obj,
 129                                 uint64_t **irq_counts, unsigned int *nb_irqs)
 130 {
 131     LM32PicState *s = LM32_PIC(obj);
 132     *irq_counts = s->stats_irq_count;
 133     *nb_irqs = ARRAY_SIZE(s->stats_irq_count);
 134     return true;
 135 }
 136
 137 static void lm32_print_info(InterruptStatsProvider *obj, Monitor *mon)
 138 {
 139     LM32PicState *s = LM32_PIC(obj);
 140     monitor_printf(mon, "lm32-pic: im=%08x ip=%08x irq_state=%08x\n",
 141             s->im, s->ip, s->irq_state);
 142 }
 143
 144 static void lm32_pic_init(Object *obj)
 145 {
 146     DeviceState *dev = DEVICE(obj);
 147     LM32PicState *s = LM32_PIC(obj);
 148     SysBusDevice *sbd = SYS_BUS_DEVICE(obj);
 149
 150     qdev_init_gpio_in(dev, irq_handler, 32);
 151     sysbus_init_irq(sbd, &s->parent_irq);
 152 }
 153
 154 static const VMStateDescription vmstate_lm32_pic = {
 155     .name = "lm32-pic",
 156     .version_id = 2,
 157     .minimum_version_id = 2,
 158     .fields = (VMStateField[]) {
 159         VMSTATE_UINT32(im, LM32PicState),
 160         VMSTATE_UINT32(ip, LM32PicState),
 161         VMSTATE_UINT32(irq_state, LM32PicState),
 162         VMSTATE_UINT64_ARRAY(stats_irq_count, LM32PicState, 32),
 163         VMSTATE_END_OF_LIST()
 164     }
 165 };
 166
 167 static void lm32_pic_class_init(ObjectClass *klass, void *data)
 168 {
 169     DeviceClass *dc = DEVICE_CLASS(klass);
 170     InterruptStatsProviderClass *ic = INTERRUPT_STATS_PROVIDER_CLASS(klass);
 171
 172     dc->reset = pic_reset;
 173     dc->vmsd = &vmstate_lm32_pic;
 174     ic->get_statistics = lm32_get_statistics;
 175     ic->print_info = lm32_print_info;
 176 }
 177
 178 static const TypeInfo lm32_pic_info = {
 179     .name          = TYPE_LM32_PIC,
 180     .parent        = TYPE_SYS_BUS_DEVICE,
 181     .instance_size = sizeof(LM32PicState),
 182     .instance_init = lm32_pic_init,
 183     .class_init    = lm32_pic_class_init,
 184     .interfaces = (InterfaceInfo[]) {
 185         { TYPE_INTERRUPT_STATS_PROVIDER },
 186         { }
 187     },
 188 };
 189
 190 static void lm32_pic_register_types(void)
 191 {
 192     type_register_static(&lm32_pic_info);
 193 }
 194
 195 type_init(lm32_pic_register_types)