155 lines
3.7 KiB
C
155 lines
3.7 KiB
C
/*
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* ColdFire Interrupt Controller emulation.
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*
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* Copyright (c) 2007 CodeSourcery.
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*
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* This code is licensed under the GPL
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*/
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#include "hw.h"
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#include "mcf.h"
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#include "exec/address-spaces.h"
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typedef struct {
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MemoryRegion iomem;
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uint64_t ipr;
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uint64_t imr;
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uint64_t ifr;
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uint64_t enabled;
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uint8_t icr[64];
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CPUM68KState *env;
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int active_vector;
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} mcf_intc_state;
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static void mcf_intc_update(mcf_intc_state *s)
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{
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uint64_t active;
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int i;
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int best;
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int best_level;
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active = (s->ipr | s->ifr) & s->enabled & ~s->imr;
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best_level = 0;
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best = 64;
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if (active) {
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for (i = 0; i < 64; i++) {
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if ((active & 1) != 0 && s->icr[i] >= best_level) {
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best_level = s->icr[i];
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best = i;
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}
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active >>= 1;
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}
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}
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s->active_vector = ((best == 64) ? 24 : (best + 64));
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m68k_set_irq_level(s->env, best_level, s->active_vector);
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}
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static uint64_t mcf_intc_read(void *opaque, hwaddr addr,
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unsigned size)
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{
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int offset;
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mcf_intc_state *s = (mcf_intc_state *)opaque;
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offset = addr & 0xff;
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if (offset >= 0x40 && offset < 0x80) {
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return s->icr[offset - 0x40];
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}
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switch (offset) {
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case 0x00:
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return (uint32_t)(s->ipr >> 32);
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case 0x04:
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return (uint32_t)s->ipr;
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case 0x08:
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return (uint32_t)(s->imr >> 32);
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case 0x0c:
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return (uint32_t)s->imr;
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case 0x10:
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return (uint32_t)(s->ifr >> 32);
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case 0x14:
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return (uint32_t)s->ifr;
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case 0xe0: /* SWIACK. */
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return s->active_vector;
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case 0xe1: case 0xe2: case 0xe3: case 0xe4:
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case 0xe5: case 0xe6: case 0xe7:
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/* LnIACK */
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hw_error("mcf_intc_read: LnIACK not implemented\n");
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default:
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return 0;
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}
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}
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static void mcf_intc_write(void *opaque, hwaddr addr,
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uint64_t val, unsigned size)
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{
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int offset;
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mcf_intc_state *s = (mcf_intc_state *)opaque;
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offset = addr & 0xff;
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if (offset >= 0x40 && offset < 0x80) {
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int n = offset - 0x40;
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s->icr[n] = val;
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if (val == 0)
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s->enabled &= ~(1ull << n);
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else
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s->enabled |= (1ull << n);
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mcf_intc_update(s);
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return;
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}
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switch (offset) {
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case 0x00: case 0x04:
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/* Ignore IPR writes. */
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return;
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case 0x08:
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s->imr = (s->imr & 0xffffffff) | ((uint64_t)val << 32);
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break;
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case 0x0c:
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s->imr = (s->imr & 0xffffffff00000000ull) | (uint32_t)val;
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break;
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default:
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hw_error("mcf_intc_write: Bad write offset %d\n", offset);
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break;
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}
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mcf_intc_update(s);
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}
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static void mcf_intc_set_irq(void *opaque, int irq, int level)
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{
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mcf_intc_state *s = (mcf_intc_state *)opaque;
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if (irq >= 64)
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return;
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if (level)
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s->ipr |= 1ull << irq;
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else
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s->ipr &= ~(1ull << irq);
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mcf_intc_update(s);
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}
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static void mcf_intc_reset(mcf_intc_state *s)
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{
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s->imr = ~0ull;
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s->ipr = 0;
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s->ifr = 0;
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s->enabled = 0;
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memset(s->icr, 0, 64);
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s->active_vector = 24;
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}
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static const MemoryRegionOps mcf_intc_ops = {
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.read = mcf_intc_read,
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.write = mcf_intc_write,
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.endianness = DEVICE_NATIVE_ENDIAN,
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};
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qemu_irq *mcf_intc_init(MemoryRegion *sysmem,
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hwaddr base,
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CPUM68KState *env)
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{
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mcf_intc_state *s;
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s = g_malloc0(sizeof(mcf_intc_state));
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s->env = env;
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mcf_intc_reset(s);
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memory_region_init_io(&s->iomem, &mcf_intc_ops, s, "mcf", 0x100);
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memory_region_add_subregion(sysmem, base, &s->iomem);
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return qemu_allocate_irqs(mcf_intc_set_irq, s, 64);
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}
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