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.h"
  26 #include "sun4m.h"
  27 #include "monitor.h"
  28 #include "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, target_phys_addr_t 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, target_phys_addr_t 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 void sun4c_pic_info(Monitor *mon, void *opaque)
  98 {
  99     Sun4c_INTCTLState *s = opaque;
 100
 101     monitor_printf(mon, "master: pending 0x%2.2x, enabled 0x%2.2x\n",
 102                    s->pending, s->reg);
 103 }
 104
 105 void sun4c_irq_info(Monitor *mon, void *opaque)
 106 {
 107 #ifndef DEBUG_IRQ_COUNT
 108     monitor_printf(mon, "irq statistic code not compiled.\n");
 109 #else
 110     Sun4c_INTCTLState *s = opaque;
 111     int64_t count;
 112
 113     monitor_printf(mon, "IRQ statistics:\n");
 114     count = s->irq_count;
 115     if (count > 0)
 116         monitor_printf(mon, " %" PRId64 "\n", count);
 117 #endif
 118 }
 119
 120 static const uint32_t intbit_to_level[] = { 0, 1, 4, 6, 8, 10, 0, 14, };
 121
 122 static void sun4c_check_interrupts(void *opaque)
 123 {
 124     Sun4c_INTCTLState *s = opaque;
 125     uint32_t pil_pending;
 126     unsigned int i;
 127
 128     pil_pending = 0;
 129     if (s->pending && !(s->reg & 0x80000000)) {
 130         for (i = 0; i < 8; i++) {
 131             if (s->pending & (1 << i))
 132                 pil_pending |= 1 << intbit_to_level[i];
 133         }
 134     }
 135
 136     for (i = 0; i < MAX_PILS; i++) {
 137         if (pil_pending & (1 << i)) {
 138             if (!(s->pil_out & (1 << i)))
 139                 qemu_irq_raise(s->cpu_irqs[i]);
 140         } else {
 141             if (s->pil_out & (1 << i))
 142                 qemu_irq_lower(s->cpu_irqs[i]);
 143         }
 144     }
 145     s->pil_out = pil_pending;
 146 }
 147
 148 /*
 149  * "irq" here is the bit number in the system interrupt register
 150  */
 151 static void sun4c_set_irq(void *opaque, int irq, int level)
 152 {
 153     Sun4c_INTCTLState *s = opaque;
 154     uint32_t mask = 1 << irq;
 155     uint32_t pil = intbit_to_level[irq];
 156
 157     DPRINTF("Set irq %d -> pil %d level %d\n", irq, pil,
 158             level);
 159     if (pil > 0) {
 160         if (level) {
 161 #ifdef DEBUG_IRQ_COUNT
 162             s->irq_count++;
 163 #endif
 164             s->pending |= mask;
 165         } else {
 166             s->pending &= ~mask;
 167         }
 168         sun4c_check_interrupts(s);
 169     }
 170 }
 171
 172 static const VMStateDescription vmstate_sun4c_intctl = {
 173     .name ="sun4c_intctl",
 174     .version_id = 1,
 175     .minimum_version_id = 1,
 176     .minimum_version_id_old = 1,
 177     .fields      = (VMStateField []) {
 178         VMSTATE_UINT8(reg, Sun4c_INTCTLState),
 179         VMSTATE_UINT8(pending, Sun4c_INTCTLState),
 180         VMSTATE_END_OF_LIST()
 181     }
 182 };
 183
 184 static void sun4c_intctl_reset(DeviceState *d)
 185 {
 186     Sun4c_INTCTLState *s = container_of(d, Sun4c_INTCTLState, busdev.qdev);
 187
 188     s->reg = 1;
 189     s->pending = 0;
 190 }
 191
 192 static int sun4c_intctl_init1(SysBusDevice *dev)
 193 {
 194     Sun4c_INTCTLState *s = FROM_SYSBUS(Sun4c_INTCTLState, dev);
 195     unsigned int i;
 196
 197     memory_region_init_io(&s->iomem, &sun4c_intctl_mem_ops, s,
 198                           "intctl", INTCTL_SIZE);
 199     sysbus_init_mmio(dev, &s->iomem);
 200     qdev_init_gpio_in(&dev->qdev, sun4c_set_irq, 8);
 201
 202     for (i = 0; i < MAX_PILS; i++) {
 203         sysbus_init_irq(dev, &s->cpu_irqs[i]);
 204     }
 205
 206     return 0;
 207 }
 208
 209 static SysBusDeviceInfo sun4c_intctl_info = {
 210     .init = sun4c_intctl_init1,
 211     .qdev.name  = "sun4c_intctl",
 212     .qdev.size  = sizeof(Sun4c_INTCTLState),
 213     .qdev.vmsd  = &vmstate_sun4c_intctl,
 214     .qdev.reset = sun4c_intctl_reset,
 215 };
 216
 217 static void sun4c_intctl_register_devices(void)
 218 {
 219     sysbus_register_withprop(&sun4c_intctl_info);
 220 }
 221
 222 device_init(sun4c_intctl_register_devices)