unicore32-softmmu: Add puv3 interrupt support

This patch adds puv3 interrupt support, include interrupt controler
device simulation and interrupt handler in puv3 machine.

Signed-off-by: Guan Xuetao <gxt@mprc.pku.edu.cn>
Signed-off-by: Blue Swirl <blauwirbel@gmail.com>

hw/Makefile.objs

@@ -66,6 +66,9 @@ hw-obj-$(CONFIG_XILINX) += xilinx_uartlite.o
 hw-obj-$(CONFIG_XILINX_AXI) += xilinx_axidma.o
 hw-obj-$(CONFIG_XILINX_AXI) += xilinx_axienet.o
 
+# PKUnity SoC devices
+hw-obj-$(CONFIG_PUV3) += puv3_intc.o
+
 # PCI watchdog devices
 hw-obj-$(CONFIG_PCI) += wdt_i6300esb.o
 

hw/puv3.c

@@ -22,9 +22,30 @@
 #define KERNEL_LOAD_ADDR        0x03000000
 #define KERNEL_MAX_SIZE         0x00800000 /* Just a guess */
 
+static void puv3_intc_cpu_handler(void *opaque, int irq, int level)
+{
+    CPUUniCore32State *env = opaque;
+
+    assert(irq == 0);
+    if (level) {
+        cpu_interrupt(env, CPU_INTERRUPT_HARD);
+    } else {
+        cpu_reset_interrupt(env, CPU_INTERRUPT_HARD);
+    }
+}
+
 static void puv3_soc_init(CPUUniCore32State *env)
 {
-    /* TODO */
+    qemu_irq *cpu_intc, irqs[PUV3_IRQS_NR];
+    DeviceState *dev;
+    int i;
+
+    /* Initialize interrupt controller */
+    cpu_intc = qemu_allocate_irqs(puv3_intc_cpu_handler, env, 1);
+    dev = sysbus_create_simple("puv3_intc", PUV3_INTC_BASE, *cpu_intc);
+    for (i = 0; i < PUV3_IRQS_NR; i++) {
+        irqs[i] = qdev_get_gpio_in(dev, i);
+    }
 }
 
 static void puv3_board_init(CPUUniCore32State *env, ram_addr_t ram_size)

hw/puv3_intc.c

@@ -0,0 +1,135 @@
+/*
+ * INTC device simulation in PKUnity SoC
+ *
+ * Copyright (C) 2010-2012 Guan Xuetao
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation, or any later version.
+ * See the COPYING file in the top-level directory.
+ */
+#include "sysbus.h"
+
+#undef DEBUG_PUV3
+#include "puv3.h"
+
+typedef struct {
+    SysBusDevice busdev;
+    MemoryRegion iomem;
+    qemu_irq parent_irq;
+
+    uint32_t reg_ICMR;
+    uint32_t reg_ICPR;
+} PUV3INTCState;
+
+/* Update interrupt status after enabled or pending bits have been changed.  */
+static void puv3_intc_update(PUV3INTCState *s)
+{
+    if (s->reg_ICMR & s->reg_ICPR) {
+        qemu_irq_raise(s->parent_irq);
+    } else {
+        qemu_irq_lower(s->parent_irq);
+    }
+}
+
+/* Process a change in an external INTC input. */
+static void puv3_intc_handler(void *opaque, int irq, int level)
+{
+    PUV3INTCState *s = opaque;
+
+    DPRINTF("irq 0x%x, level 0x%x\n", irq, level);
+    if (level) {
+        s->reg_ICPR |= (1 << irq);
+    } else {
+        s->reg_ICPR &= ~(1 << irq);
+    }
+    puv3_intc_update(s);
+}
+
+static uint64_t puv3_intc_read(void *opaque, target_phys_addr_t offset,
+        unsigned size)
+{
+    PUV3INTCState *s = opaque;
+    uint32_t ret = 0;
+
+    switch (offset) {
+    case 0x04: /* INTC_ICMR */
+        ret = s->reg_ICMR;
+        break;
+    case 0x0c: /* INTC_ICIP */
+        ret = s->reg_ICPR; /* the same value with ICPR */
+        break;
+    default:
+        DPRINTF("Bad offset %x\n", (int)offset);
+    }
+    DPRINTF("offset 0x%x, value 0x%x\n", offset, ret);
+    return ret;
+}
+
+static void puv3_intc_write(void *opaque, target_phys_addr_t offset,
+        uint64_t value, unsigned size)
+{
+    PUV3INTCState *s = opaque;
+
+    DPRINTF("offset 0x%x, value 0x%x\n", offset, value);
+    switch (offset) {
+    case 0x00: /* INTC_ICLR */
+    case 0x14: /* INTC_ICCR */
+        break;
+    case 0x04: /* INTC_ICMR */
+        s->reg_ICMR = value;
+        break;
+    default:
+        DPRINTF("Bad offset 0x%x\n", (int)offset);
+        return;
+    }
+    puv3_intc_update(s);
+}
+
+static const MemoryRegionOps puv3_intc_ops = {
+    .read = puv3_intc_read,
+    .write = puv3_intc_write,
+    .impl = {
+        .min_access_size = 4,
+        .max_access_size = 4,
+    },
+    .endianness = DEVICE_NATIVE_ENDIAN,
+};
+
+static int puv3_intc_init(SysBusDevice *dev)
+{
+    PUV3INTCState *s = FROM_SYSBUS(PUV3INTCState, dev);
+
+    qdev_init_gpio_in(&s->busdev.qdev, puv3_intc_handler, PUV3_IRQS_NR);
+    sysbus_init_irq(&s->busdev, &s->parent_irq);
+
+    s->reg_ICMR = 0;
+    s->reg_ICPR = 0;
+
+    memory_region_init_io(&s->iomem, &puv3_intc_ops, s, "puv3_intc",
+            PUV3_REGS_OFFSET);
+    sysbus_init_mmio(dev, &s->iomem);
+
+    return 0;
+}
+
+static void puv3_intc_class_init(ObjectClass *klass, void *data)
+{
+    SysBusDeviceClass *sdc = SYS_BUS_DEVICE_CLASS(klass);
+
+    sdc->init = puv3_intc_init;
+}
+
+static const TypeInfo puv3_intc_info = {
+    .name = "puv3_intc",
+    .parent = TYPE_SYS_BUS_DEVICE,
+    .instance_size = sizeof(PUV3INTCState),
+    .class_init = puv3_intc_class_init,
+};
+
+static void puv3_intc_register_type(void)
+{
+    type_register_static(&puv3_intc_info);
+}
+
+type_init(puv3_intc_register_type)