hw/sun4c_intctl.c

   1 /*
   2  * QEMU Sparc Sun4c interrupt controller emulation
   3  *
   4  * Based on slavio_intctl, copyright (c) 2003-2005 Fabrice Bellard
   5  *
   6  * Permission is hereby granted, free of charge, to any person obtaining a copy
   7  * of this software and associated documentation files (the "Software"), to deal
   8  * in the Software without restriction, including without limitation the rights
   9  * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
  10  * copies of the Software, and to permit persons to whom the Software is
  11  * furnished to do so, subject to the following conditions:
  12  *
  13  * The above copyright notice and this permission notice shall be included in
  14  * all copies or substantial portions of the Software.
  15  *
  16  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  17  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  18  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
  19  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  20  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
  21  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
  22  * THE SOFTWARE.
  23  */
  24
  25 #include "hw/hw.h"
  26 #include "hw/sun4m.h"
  27 #include "monitor/monitor.h"
  28 #include "hw/sysbus.h"
  29
  30 //#define DEBUG_IRQ_COUNT
  31 //#define DEBUG_IRQ
  32
  33 #ifdef DEBUG_IRQ
  34 #define DPRINTF(fmt, ...)                                       \
  35     do { printf("IRQ: " fmt , ## __VA_ARGS__); } while (0)
  36 #else
  37 #define DPRINTF(fmt, ...)
  38 #endif
  39
  40 /*
  41  * Registers of interrupt controller in sun4c.
  42  *
  43  */
  44
  45 #define MAX_PILS 16
  46
  47 typedef struct Sun4c_INTCTLState {
  48     SysBusDevice busdev;
  49     MemoryRegion iomem;
  50 #ifdef DEBUG_IRQ_COUNT
  51     uint64_t irq_count;
  52 #endif
  53     qemu_irq cpu_irqs[MAX_PILS];
  54     const uint32_t *intbit_to_level;
  55     uint32_t pil_out;
  56     uint8_t reg;
  57     uint8_t pending;
  58 } Sun4c_INTCTLState;
  59
  60 #define INTCTL_SIZE 1
  61
  62 static void sun4c_check_interrupts(void *opaque);
  63
  64 static uint64_t sun4c_intctl_mem_read(void *opaque, hwaddr addr,
  65                                       unsigned size)
  66 {
  67     Sun4c_INTCTLState *s = opaque;
  68     uint32_t ret;
  69
  70     ret = s->reg;
  71     DPRINTF("read reg 0x" TARGET_FMT_plx " = %x\n", addr, ret);
  72
  73     return ret;
  74 }
  75
  76 static void sun4c_intctl_mem_write(void *opaque, hwaddr addr,
  77                                    uint64_t val, unsigned size)
  78 {
  79     Sun4c_INTCTLState *s = opaque;
  80
  81     DPRINTF("write reg 0x" TARGET_FMT_plx " = %x\n", addr, (unsigned)val);
  82     val &= 0xbf;
  83     s->reg = val;
  84     sun4c_check_interrupts(s);
  85 }
  86
  87 static const MemoryRegionOps sun4c_intctl_mem_ops = {
  88     .read = sun4c_intctl_mem_read,
  89     .write = sun4c_intctl_mem_write,
  90     .endianness = DEVICE_NATIVE_ENDIAN,
  91     .valid = {
  92         .min_access_size = 1,
  93         .max_access_size = 1,
  94     },
  95 };
  96
  97 static const uint32_t intbit_to_level[] = { 0, 1, 4, 6, 8, 10, 0, 14, };
  98
  99 static void sun4c_check_interrupts(void *opaque)
 100 {
 101     Sun4c_INTCTLState *s = opaque;
 102     uint32_t pil_pending;
 103     unsigned int i;
 104
 105     pil_pending = 0;
 106     if (s->pending && !(s->reg & 0x80000000)) {
 107         for (i = 0; i < 8; i++) {
 108             if (s->pending & (1 << i))
 109                 pil_pending |= 1 << intbit_to_level[i];
 110         }
 111     }
 112
 113     for (i = 0; i < MAX_PILS; i++) {
 114         if (pil_pending & (1 << i)) {
 115             if (!(s->pil_out & (1 << i)))
 116                 qemu_irq_raise(s->cpu_irqs[i]);
 117         } else {
 118             if (s->pil_out & (1 << i))
 119                 qemu_irq_lower(s->cpu_irqs[i]);
 120         }
 121     }
 122     s->pil_out = pil_pending;
 123 }
 124
 125 /*
 126  * "irq" here is the bit number in the system interrupt register
 127  */
 128 static void sun4c_set_irq(void *opaque, int irq, int level)
 129 {
 130     Sun4c_INTCTLState *s = opaque;
 131     uint32_t mask = 1 << irq;
 132     uint32_t pil = intbit_to_level[irq];
 133
 134     DPRINTF("Set irq %d -> pil %d level %d\n", irq, pil,
 135             level);
 136     if (pil > 0) {
 137         if (level) {
 138 #ifdef DEBUG_IRQ_COUNT
 139             s->irq_count++;
 140 #endif
 141             s->pending |= mask;
 142         } else {
 143             s->pending &= ~mask;
 144         }
 145         sun4c_check_interrupts(s);
 146     }
 147 }
 148
 149 static const VMStateDescription vmstate_sun4c_intctl = {
 150     .name ="sun4c_intctl",
 151     .version_id = 1,
 152     .minimum_version_id = 1,
 153     .minimum_version_id_old = 1,
 154     .fields      = (VMStateField []) {
 155         VMSTATE_UINT8(reg, Sun4c_INTCTLState),
 156         VMSTATE_UINT8(pending, Sun4c_INTCTLState),
 157         VMSTATE_END_OF_LIST()
 158     }
 159 };
 160
 161 static void sun4c_intctl_reset(DeviceState *d)
 162 {
 163     Sun4c_INTCTLState *s = container_of(d, Sun4c_INTCTLState, busdev.qdev);
 164
 165     s->reg = 1;
 166     s->pending = 0;
 167 }
 168
 169 static int sun4c_intctl_init1(SysBusDevice *dev)
 170 {
 171     Sun4c_INTCTLState *s = FROM_SYSBUS(Sun4c_INTCTLState, dev);
 172     unsigned int i;
 173
 174     memory_region_init_io(&s->iomem, &sun4c_intctl_mem_ops, s,
 175                           "intctl", INTCTL_SIZE);
 176     sysbus_init_mmio(dev, &s->iomem);
 177     qdev_init_gpio_in(&dev->qdev, sun4c_set_irq, 8);
 178
 179     for (i = 0; i < MAX_PILS; i++) {
 180         sysbus_init_irq(dev, &s->cpu_irqs[i]);
 181     }
 182
 183     return 0;
 184 }
 185
 186 static void sun4c_intctl_class_init(ObjectClass *klass, void *data)
 187 {
 188     DeviceClass *dc = DEVICE_CLASS(klass);
 189     SysBusDeviceClass *k = SYS_BUS_DEVICE_CLASS(klass);
 190
 191     k->init = sun4c_intctl_init1;
 192     dc->reset = sun4c_intctl_reset;
 193     dc->vmsd = &vmstate_sun4c_intctl;
 194 }
 195
 196 static const TypeInfo sun4c_intctl_info = {
 197     .name          = "sun4c_intctl",
 198     .parent        = TYPE_SYS_BUS_DEVICE,
 199     .instance_size = sizeof(Sun4c_INTCTLState),
 200     .class_init    = sun4c_intctl_class_init,
 201 };
 202
 203 static void sun4c_intctl_register_types(void)
 204 {
 205     type_register_static(&sun4c_intctl_info);
 206 }
 207
 208 type_init(sun4c_intctl_register_types)