--- /dev/null
+/*
+ * QEMU ETRAX Interrupt Controller.
+ *
+ * Copyright (c) 2008 Edgar E. Iglesias, Axis Communications AB.
+ *
+ * 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 "hw/sysbus.h"
+#include "hw/hw.h"
+//#include "pc.h"
+//#include "etraxfs.h"
+
+#define D(x)
+
+#define R_RW_MASK 0
+#define R_R_VECT 1
+#define R_R_MASKED_VECT 2
+#define R_R_NMI 3
+#define R_R_GURU 4
+#define R_MAX 5
+
+#define TYPE_ETRAX_FS_PIC "etraxfs,pic"
+#define ETRAX_FS_PIC(obj) \
+ OBJECT_CHECK(struct etrax_pic, (obj), TYPE_ETRAX_FS_PIC)
+
+struct etrax_pic
+{
+ SysBusDevice parent_obj;
+
+ MemoryRegion mmio;
+ void *interrupt_vector;
+ qemu_irq parent_irq;
+ qemu_irq parent_nmi;
+ uint32_t regs[R_MAX];
+};
+
+static void pic_update(struct etrax_pic *fs)
+{
+ uint32_t vector = 0;
+ int i;
+
+ fs->regs[R_R_MASKED_VECT] = fs->regs[R_R_VECT] & fs->regs[R_RW_MASK];
+
+ /* The ETRAX interrupt controller signals interrupts to the core
+ through an interrupt request wire and an irq vector bus. If
+ multiple interrupts are simultaneously active it chooses vector
+ 0x30 and lets the sw choose the priorities. */
+ if (fs->regs[R_R_MASKED_VECT]) {
+ uint32_t mv = fs->regs[R_R_MASKED_VECT];
+ for (i = 0; i < 31; i++) {
+ if (mv & 1) {
+ vector = 0x31 + i;
+ /* Check for multiple interrupts. */
+ if (mv > 1)
+ vector = 0x30;
+ break;
+ }
+ mv >>= 1;
+ }
+ }
+
+ if (fs->interrupt_vector) {
+ /* hack alert: ptr property */
+ *(uint32_t*)(fs->interrupt_vector) = vector;
+ }
+ qemu_set_irq(fs->parent_irq, !!vector);
+}
+
+static uint64_t
+pic_read(void *opaque, hwaddr addr, unsigned int size)
+{
+ struct etrax_pic *fs = opaque;
+ uint32_t rval;
+
+ rval = fs->regs[addr >> 2];
+ D(printf("%s %x=%x\n", __func__, addr, rval));
+ return rval;
+}
+
+static void pic_write(void *opaque, hwaddr addr,
+ uint64_t value, unsigned int size)
+{
+ struct etrax_pic *fs = opaque;
+ D(printf("%s addr=%x val=%x\n", __func__, addr, value));
+
+ if (addr == R_RW_MASK) {
+ fs->regs[R_RW_MASK] = value;
+ pic_update(fs);
+ }
+}
+
+static const MemoryRegionOps pic_ops = {
+ .read = pic_read,
+ .write = pic_write,
+ .endianness = DEVICE_NATIVE_ENDIAN,
+ .valid = {
+ .min_access_size = 4,
+ .max_access_size = 4
+ }
+};
+
+static void nmi_handler(void *opaque, int irq, int level)
+{
+ struct etrax_pic *fs = (void *)opaque;
+ uint32_t mask;
+
+ mask = 1 << irq;
+ if (level)
+ fs->regs[R_R_NMI] |= mask;
+ else
+ fs->regs[R_R_NMI] &= ~mask;
+
+ qemu_set_irq(fs->parent_nmi, !!fs->regs[R_R_NMI]);
+}
+
+static void irq_handler(void *opaque, int irq, int level)
+{
+ struct etrax_pic *fs = (void *)opaque;
+
+ if (irq >= 30) {
+ nmi_handler(opaque, irq, level);
+ return;
+ }
+
+ irq -= 1;
+ fs->regs[R_R_VECT] &= ~(1 << irq);
+ fs->regs[R_R_VECT] |= (!!level << irq);
+ pic_update(fs);
+}
+
+static int etraxfs_pic_init(SysBusDevice *sbd)
+{
+ DeviceState *dev = DEVICE(sbd);
+ struct etrax_pic *s = ETRAX_FS_PIC(dev);
+
+ qdev_init_gpio_in(dev, irq_handler, 32);
+ sysbus_init_irq(sbd, &s->parent_irq);
+ sysbus_init_irq(sbd, &s->parent_nmi);
+
+ memory_region_init_io(&s->mmio, OBJECT(s), &pic_ops, s,
+ "etraxfs-pic", R_MAX * 4);
+ sysbus_init_mmio(sbd, &s->mmio);
+ return 0;
+}
+
+static Property etraxfs_pic_properties[] = {
+ DEFINE_PROP_PTR("interrupt_vector", struct etrax_pic, interrupt_vector),
+ DEFINE_PROP_END_OF_LIST(),
+};
+
+static void etraxfs_pic_class_init(ObjectClass *klass, void *data)
+{
+ DeviceClass *dc = DEVICE_CLASS(klass);
+ SysBusDeviceClass *k = SYS_BUS_DEVICE_CLASS(klass);
+
+ k->init = etraxfs_pic_init;
+ dc->props = etraxfs_pic_properties;
+ /*
+ * Note: pointer property "interrupt_vector" may remain null, thus
+ * no need for dc->cannot_instantiate_with_device_add_yet = true;
+ */
+}
+
+static const TypeInfo etraxfs_pic_info = {
+ .name = TYPE_ETRAX_FS_PIC,
+ .parent = TYPE_SYS_BUS_DEVICE,
+ .instance_size = sizeof(struct etrax_pic),
+ .class_init = etraxfs_pic_class_init,
+};
+
+static void etraxfs_pic_register_types(void)
+{
+ type_register_static(&etraxfs_pic_info);
+}
+
+type_init(etraxfs_pic_register_types)
Code Review / kvmfornfv.git / blobdiff