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-rw-r--r--hw/syborg_interrupt.c227
1 files changed, 227 insertions, 0 deletions
diff --git a/hw/syborg_interrupt.c b/hw/syborg_interrupt.c
new file mode 100644
index 0000000000..e3fbbf7bf3
--- /dev/null
+++ b/hw/syborg_interrupt.c
@@ -0,0 +1,227 @@
+/*
+ * Syborg interrupt controller.
+ *
+ * Copyright (c) 2008 CodeSourcery
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
+ * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ */
+
+#include "sysbus.h"
+#include "syborg.h"
+
+//#define DEBUG_SYBORG_INT
+
+#ifdef DEBUG_SYBORG_INT
+#define DPRINTF(fmt, ...) \
+do { printf("syborg_int: " fmt , ## __VA_ARGS__); } while (0)
+#define BADF(fmt, ...) \
+do { fprintf(stderr, "syborg_int: error: " fmt , ## __VA_ARGS__); \
+ exit(1);} while (0)
+#else
+#define DPRINTF(fmt, ...) do {} while(0)
+#define BADF(fmt, ...) \
+do { fprintf(stderr, "syborg_int: error: " fmt , ## __VA_ARGS__);} while (0)
+#endif
+enum {
+ INT_ID = 0,
+ INT_STATUS = 1, /* number of pending interrupts */
+ INT_CURRENT = 2, /* next interrupt to be serviced */
+ INT_DISABLE_ALL = 3,
+ INT_DISABLE = 4,
+ INT_ENABLE = 5,
+ INT_TOTAL = 6
+};
+
+typedef struct {
+ unsigned level:1;
+ unsigned enabled:1;
+} syborg_int_flags;
+
+typedef struct {
+ SysBusDevice busdev;
+ int pending_count;
+ int num_irqs;
+ syborg_int_flags *flags;
+ qemu_irq parent_irq;
+} SyborgIntState;
+
+static void syborg_int_update(SyborgIntState *s)
+{
+ DPRINTF("pending %d\n", s->pending_count);
+ qemu_set_irq(s->parent_irq, s->pending_count > 0);
+}
+
+static void syborg_int_set_irq(void *opaque, int irq, int level)
+{
+ SyborgIntState *s = (SyborgIntState *)opaque;
+
+ if (s->flags[irq].level == level)
+ return;
+
+ s->flags[irq].level = level;
+ if (s->flags[irq].enabled) {
+ if (level)
+ s->pending_count++;
+ else
+ s->pending_count--;
+ syborg_int_update(s);
+ }
+}
+
+static uint32_t syborg_int_read(void *opaque, target_phys_addr_t offset)
+{
+ SyborgIntState *s = (SyborgIntState *)opaque;
+ int i;
+
+ offset &= 0xfff;
+ switch (offset >> 2) {
+ case INT_ID:
+ return SYBORG_ID_INT;
+ case INT_STATUS:
+ DPRINTF("read status=%d\n", s->pending_count);
+ return s->pending_count;
+
+ case INT_CURRENT:
+ for (i = 0; i < s->num_irqs; i++) {
+ if (s->flags[i].level & s->flags[i].enabled) {
+ DPRINTF("read current=%d\n", i);
+ return i;
+ }
+ }
+ DPRINTF("read current=none\n");
+ return 0xffffffffu;
+
+ default:
+ cpu_abort(cpu_single_env, "syborg_int_read: Bad offset %x\n",
+ (int)offset);
+ return 0;
+ }
+}
+
+static void syborg_int_write(void *opaque, target_phys_addr_t offset, uint32_t value)
+{
+ SyborgIntState *s = (SyborgIntState *)opaque;
+ int i;
+ offset &= 0xfff;
+
+ DPRINTF("syborg_int_write offset=%d val=%d\n", (int)offset, (int)value);
+ switch (offset >> 2) {
+ case INT_DISABLE_ALL:
+ s->pending_count = 0;
+ for (i = 0; i < s->num_irqs; i++)
+ s->flags[i].enabled = 0;
+ break;
+
+ case INT_DISABLE:
+ if (value >= s->num_irqs)
+ break;
+ if (s->flags[value].enabled) {
+ if (s->flags[value].enabled)
+ s->pending_count--;
+ s->flags[value].enabled = 0;
+ }
+ break;
+
+ case INT_ENABLE:
+ if (value >= s->num_irqs)
+ break;
+ if (!(s->flags[value].enabled)) {
+ if(s->flags[value].level)
+ s->pending_count++;
+ s->flags[value].enabled = 1;
+ }
+ break;
+
+ default:
+ cpu_abort(cpu_single_env, "syborg_int_write: Bad offset %x\n",
+ (int)offset);
+ return;
+ }
+ syborg_int_update(s);
+}
+
+static CPUReadMemoryFunc *syborg_int_readfn[] = {
+ syborg_int_read,
+ syborg_int_read,
+ syborg_int_read
+};
+
+static CPUWriteMemoryFunc *syborg_int_writefn[] = {
+ syborg_int_write,
+ syborg_int_write,
+ syborg_int_write
+};
+
+static void syborg_int_save(QEMUFile *f, void *opaque)
+{
+ SyborgIntState *s = (SyborgIntState *)opaque;
+ int i;
+
+ qemu_put_be32(f, s->num_irqs);
+ qemu_put_be32(f, s->pending_count);
+ for (i = 0; i < s->num_irqs; i++) {
+ qemu_put_be32(f, s->flags[i].enabled
+ | ((unsigned)s->flags[i].level << 1));
+ }
+}
+
+static int syborg_int_load(QEMUFile *f, void *opaque, int version_id)
+{
+ SyborgIntState *s = (SyborgIntState *)opaque;
+ uint32_t val;
+ int i;
+
+ if (version_id != 1)
+ return -EINVAL;
+
+ val = qemu_get_be32(f);
+ if (val != s->num_irqs)
+ return -EINVAL;
+ s->pending_count = qemu_get_be32(f);
+ for (i = 0; i < s->num_irqs; i++) {
+ val = qemu_get_be32(f);
+ s->flags[i].enabled = val & 1;
+ s->flags[i].level = (val >> 1) & 1;
+ }
+ return 0;
+}
+
+static void syborg_int_init(SysBusDevice *dev)
+{
+ SyborgIntState *s = FROM_SYSBUS(SyborgIntState, dev);
+ int iomemtype;
+
+ sysbus_init_irq(dev, &s->parent_irq);
+ s->num_irqs = qdev_get_prop_int(&dev->qdev, "num-interrupts", 64);
+ qdev_init_irq_sink(&dev->qdev, syborg_int_set_irq, s->num_irqs);
+ iomemtype = cpu_register_io_memory(0, syborg_int_readfn,
+ syborg_int_writefn, s);
+ sysbus_init_mmio(dev, 0x1000, iomemtype);
+ s->flags = qemu_mallocz(s->num_irqs * sizeof(syborg_int_flags));
+
+ register_savevm("syborg_int", -1, 1, syborg_int_save, syborg_int_load, s);
+}
+
+static void syborg_interrupt_register_devices(void)
+{
+ sysbus_register_dev("syborg,interrupt", sizeof(SyborgIntState),
+ syborg_int_init);
+}
+
+device_init(syborg_interrupt_register_devices)
generated by cgit v1.2.3 (git 2.26.2) at 2024-11-30 01:51:54 +0000