218 lines
5.1 KiB
C
218 lines
5.1 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 "qemu/osdep.h"
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#include "qapi/error.h"
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#include "qemu/module.h"
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#include "qemu/log.h"
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#include "cpu.h"
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#include "hw/irq.h"
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#include "hw/sysbus.h"
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#include "hw/m68k/mcf.h"
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#include "qom/object.h"
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#define TYPE_MCF_INTC "mcf-intc"
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OBJECT_DECLARE_SIMPLE_TYPE(mcf_intc_state, MCF_INTC)
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struct mcf_intc_state {
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SysBusDevice parent_obj;
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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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M68kCPU *cpu;
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int active_vector;
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};
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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->cpu, 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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qemu_log_mask(LOG_UNIMP, "%s: LnIACK not implemented (offset 0x%02x)\n",
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__func__, offset);
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/* fallthru */
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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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case 0x1c:
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if (val & 0x40) {
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s->imr = ~0ull;
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} else {
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s->imr |= (0x1ull << (val & 0x3f));
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}
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break;
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case 0x1d:
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if (val & 0x40) {
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s->imr = 0ull;
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} else {
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s->imr &= ~(0x1ull << (val & 0x3f));
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}
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break;
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default:
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qemu_log_mask(LOG_GUEST_ERROR, "%s: Bad offset 0x%02x\n",
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__func__, offset);
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return;
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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(DeviceState *dev)
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{
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mcf_intc_state *s = MCF_INTC(dev);
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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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static void mcf_intc_instance_init(Object *obj)
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{
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mcf_intc_state *s = MCF_INTC(obj);
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memory_region_init_io(&s->iomem, obj, &mcf_intc_ops, s, "mcf", 0x100);
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}
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static void mcf_intc_class_init(ObjectClass *oc, void *data)
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{
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DeviceClass *dc = DEVICE_CLASS(oc);
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set_bit(DEVICE_CATEGORY_MISC, dc->categories);
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dc->reset = mcf_intc_reset;
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}
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static const TypeInfo mcf_intc_gate_info = {
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.name = TYPE_MCF_INTC,
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.parent = TYPE_SYS_BUS_DEVICE,
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.instance_size = sizeof(mcf_intc_state),
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.instance_init = mcf_intc_instance_init,
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.class_init = mcf_intc_class_init,
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};
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static void mcf_intc_register_types(void)
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{
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type_register_static(&mcf_intc_gate_info);
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}
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type_init(mcf_intc_register_types)
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qemu_irq *mcf_intc_init(MemoryRegion *sysmem,
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hwaddr base,
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M68kCPU *cpu)
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{
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DeviceState *dev;
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mcf_intc_state *s;
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dev = qdev_new(TYPE_MCF_INTC);
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sysbus_realize_and_unref(SYS_BUS_DEVICE(dev), &error_fatal);
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s = MCF_INTC(dev);
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s->cpu = cpu;
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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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