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, ...)                                       \
  32     do { printf("IRQ: " fmt , ## __VA_ARGS__); } while (0)
  33 #else
  34 #define DPRINTF(fmt, ...)
  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;
 111     if (count > 0)
 112         monitor_printf(mon, " %" PRId64 "\n", 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     pil_pending = 0;
 125     if (s->pending && !(s->reg & 0x80000000)) {
 126         for (i = 0; i < 8; i++) {
 127             if (s->pending & (1 << i))
 128                 pil_pending |= 1 << intbit_to_level[i];
 129         }
 130     }
 131
 132     for (i = 0; i < MAX_PILS; i++) {
 133         if (pil_pending & (1 << i)) {
 134             if (!(s->pil_out & (1 << i)))
 135                 qemu_irq_raise(s->cpu_irqs[i]);
 136         } else {
 137             if (s->pil_out & (1 << i))
 138                 qemu_irq_lower(s->cpu_irqs[i]);
 139         }
 140     }
 141     s->pil_out = pil_pending;
 142 }
 143
 144 /*
 145  * "irq" here is the bit number in the system interrupt register
 146  */
 147 static void sun4c_set_irq(void *opaque, int irq, int level)
 148 {
 149     Sun4c_INTCTLState *s = opaque;
 150     uint32_t mask = 1 << irq;
 151     uint32_t pil = intbit_to_level[irq];
 152
 153     DPRINTF("Set irq %d -> pil %d level %d\n", irq, pil,
 154             level);
 155     if (pil > 0) {
 156         if (level) {
 157 #ifdef DEBUG_IRQ_COUNT
 158             s->irq_count++;
 159 #endif
 160             s->pending |= mask;
 161         } else {
 162             s->pending &= ~mask;
 163         }
 164         sun4c_check_interrupts(s);
 165     }
 166 }
 167
 168 static void sun4c_intctl_save(QEMUFile *f, void *opaque)
 169 {
 170     Sun4c_INTCTLState *s = opaque;
 171
 172     qemu_put_8s(f, &s->reg);
 173     qemu_put_8s(f, &s->pending);
 174 }
 175
 176 static int sun4c_intctl_load(QEMUFile *f, void *opaque, int version_id)
 177 {
 178     Sun4c_INTCTLState *s = opaque;
 179
 180     if (version_id != 1)
 181         return -EINVAL;
 182
 183     qemu_get_8s(f, &s->reg);
 184     qemu_get_8s(f, &s->pending);
 185
 186     return 0;
 187 }
 188
 189 static void sun4c_intctl_reset(void *opaque)
 190 {
 191     Sun4c_INTCTLState *s = opaque;
 192
 193     s->reg = 1;
 194     s->pending = 0;
 195 }
 196
 197 void *sun4c_intctl_init(target_phys_addr_t addr, qemu_irq **irq,
 198                         qemu_irq *parent_irq)
 199 {
 200     int sun4c_intctl_io_memory;
 201     Sun4c_INTCTLState *s;
 202
 203     s = qemu_mallocz(sizeof(Sun4c_INTCTLState));
 204
 205     sun4c_intctl_io_memory = cpu_register_io_memory(sun4c_intctl_mem_read,
 206                                                     sun4c_intctl_mem_write, s);
 207     cpu_register_physical_memory(addr, INTCTL_SIZE, sun4c_intctl_io_memory);
 208     s->cpu_irqs = parent_irq;
 209
 210     register_savevm("sun4c_intctl", addr, 1, sun4c_intctl_save,
 211                     sun4c_intctl_load, s);
 212
 213     qemu_register_reset(sun4c_intctl_reset, s);
 214     *irq = qemu_allocate_irqs(sun4c_set_irq, s, 8);
 215
 216     sun4c_intctl_reset(s);
 217     return s;
 218 }