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 #include "hw.h"
  25 #include "sun4m.h"
  26 #include "monitor.h"
  27 //#define DEBUG_IRQ_COUNT
  28 //#define DEBUG_IRQ
  29
  30 #ifdef DEBUG_IRQ
  31 #define DPRINTF(fmt, args...) \
  32 do { printf("IRQ: " fmt , ##args); } while (0)
  33 #else
  34 #define DPRINTF(fmt, args...)
  35 #endif
  36
  37 /*
  38  * Registers of interrupt controller in sun4c.
  39  *
  40  */
  41
  42 #define MAX_PILS 16
  43
  44 typedef struct Sun4c_INTCTLState {
  45 #ifdef DEBUG_IRQ_COUNT
  46     uint64_t irq_count;
  47 #endif
  48     qemu_irq *cpu_irqs;
  49     const uint32_t *intbit_to_level;
  50     uint32_t pil_out;
  51     uint8_t reg;
  52     uint8_t pending;
  53 } Sun4c_INTCTLState;
  54
  55 #define INTCTL_SIZE 1
  56
  57 static void sun4c_check_interrupts(void *opaque);
  58
  59 static uint32_t sun4c_intctl_mem_readb(void *opaque, target_phys_addr_t addr)
  60 {
  61     Sun4c_INTCTLState *s = opaque;
  62     uint32_t ret;
  63
  64     ret = s->reg;
  65     DPRINTF("read reg 0x" TARGET_FMT_plx " = %x\n", addr, ret);
  66
  67     return ret;
  68 }
  69
  70 static void sun4c_intctl_mem_writeb(void *opaque, target_phys_addr_t addr,
  71                                     uint32_t val)
  72 {
  73     Sun4c_INTCTLState *s = opaque;
  74
  75     DPRINTF("write reg 0x" TARGET_FMT_plx " = %x\n", addr, val);
  76     val &= 0xbf;
  77     s->reg = val;
  78     sun4c_check_interrupts(s);
  79 }
  80
  81 static CPUReadMemoryFunc *sun4c_intctl_mem_read[3] = {
  82     sun4c_intctl_mem_readb,
  83     NULL,
  84     NULL,
  85 };
  86
  87 static CPUWriteMemoryFunc *sun4c_intctl_mem_write[3] = {
  88     sun4c_intctl_mem_writeb,
  89     NULL,
  90     NULL,
  91 };
  92
  93 void sun4c_pic_info(Monitor *mon, void *opaque)
  94 {
  95     Sun4c_INTCTLState *s = opaque;
  96
  97     monitor_printf(mon, "master: pending 0x%2.2x, enabled 0x%2.2x\n",
  98                    s->pending, s->reg);
  99 }
 100
 101 void sun4c_irq_info(Monitor *mon, void *opaque)
 102 {
 103 #ifndef DEBUG_IRQ_COUNT
 104     monitor_printf(mon, "irq statistic code not compiled.\n");
 105 #else
 106     Sun4c_INTCTLState *s = opaque;
 107     int64_t count;
 108
 109     monitor_printf(mon, "IRQ statistics:\n");
 110     count = s->irq_count[i];
 111     if (count > 0)
 112         monitor_printf(mon, "%2d: %" PRId64 "\n", i, count);
 113 #endif
 114 }
 115
 116 static const uint32_t intbit_to_level[] = { 0, 1, 4, 6, 8, 10, 0, 14, };
 117
 118 static void sun4c_check_interrupts(void *opaque)
 119 {
 120     Sun4c_INTCTLState *s = opaque;
 121     uint32_t pil_pending;
 122     unsigned int i;
 123
 124     DPRINTF("pending %x disabled %x\n", pending, s->intregm_disabled);
 125     pil_pending = 0;
 126     if (s->pending && !(s->reg & 0x80000000)) {
 127         for (i = 0; i < 8; i++) {
 128             if (s->pending & (1 << i))
 129                 pil_pending |= 1 << intbit_to_level[i];
 130         }
 131     }
 132
 133     for (i = 0; i < MAX_PILS; i++) {
 134         if (pil_pending & (1 << i)) {
 135             if (!(s->pil_out & (1 << i)))
 136                 qemu_irq_raise(s->cpu_irqs[i]);
 137         } else {
 138             if (s->pil_out & (1 << i))
 139                 qemu_irq_lower(s->cpu_irqs[i]);
 140         }
 141     }
 142     s->pil_out = pil_pending;
 143 }
 144
 145 /*
 146  * "irq" here is the bit number in the system interrupt register
 147  */
 148 static void sun4c_set_irq(void *opaque, int irq, int level)
 149 {
 150     Sun4c_INTCTLState *s = opaque;
 151     uint32_t mask = 1 << irq;
 152     uint32_t pil = intbit_to_level[irq];
 153
 154     DPRINTF("Set irq %d -> pil %d level %d\n", irq, pil,
 155             level);
 156     if (pil > 0) {
 157         if (level) {
 158 #ifdef DEBUG_IRQ_COUNT
 159             s->irq_count[pil]++;
 160 #endif
 161             s->pending |= mask;
 162         } else {
 163             s->pending &= ~mask;
 164         }
 165         sun4c_check_interrupts(s);
 166     }
 167 }
 168
 169 static void sun4c_intctl_save(QEMUFile *f, void *opaque)
 170 {
 171     Sun4c_INTCTLState *s = opaque;
 172
 173     qemu_put_8s(f, &s->reg);
 174     qemu_put_8s(f, &s->pending);
 175 }
 176
 177 static int sun4c_intctl_load(QEMUFile *f, void *opaque, int version_id)
 178 {
 179     Sun4c_INTCTLState *s = opaque;
 180
 181     if (version_id != 1)
 182         return -EINVAL;
 183
 184     qemu_get_8s(f, &s->reg);
 185     qemu_get_8s(f, &s->pending);
 186     sun4c_check_interrupts(s);
 187
 188     return 0;
 189 }
 190
 191 static void sun4c_intctl_reset(void *opaque)
 192 {
 193     Sun4c_INTCTLState *s = opaque;
 194
 195     s->reg = 1;
 196     s->pending = 0;
 197     sun4c_check_interrupts(s);
 198 }
 199
 200 void *sun4c_intctl_init(target_phys_addr_t addr, qemu_irq **irq,
 201                         qemu_irq *parent_irq)
 202 {
 203     int sun4c_intctl_io_memory;
 204     Sun4c_INTCTLState *s;
 205
 206     s = qemu_mallocz(sizeof(Sun4c_INTCTLState));
 207
 208     sun4c_intctl_io_memory = cpu_register_io_memory(0, sun4c_intctl_mem_read,
 209                                                     sun4c_intctl_mem_write, s);
 210     cpu_register_physical_memory(addr, INTCTL_SIZE, sun4c_intctl_io_memory);
 211     s->cpu_irqs = parent_irq;
 212
 213     register_savevm("sun4c_intctl", addr, 1, sun4c_intctl_save,
 214                     sun4c_intctl_load, s);
 215
 216     qemu_register_reset(sun4c_intctl_reset, s);
 217     *irq = qemu_allocate_irqs(sun4c_set_irq, s, 8);
 218
 219     sun4c_intctl_reset(s);
 220     return s;
 221 }