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Diffstat (limited to 'qemu/hw/timer/puv3_ost.c')
-rw-r--r--qemu/hw/timer/puv3_ost.c156
1 files changed, 156 insertions, 0 deletions
diff --git a/qemu/hw/timer/puv3_ost.c b/qemu/hw/timer/puv3_ost.c
new file mode 100644
index 000000000..fa9eefd92
--- /dev/null
+++ b/qemu/hw/timer/puv3_ost.c
@@ -0,0 +1,156 @@
+/*
+ * OSTimer 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 "hw/sysbus.h"
+#include "hw/ptimer.h"
+#include "qemu/main-loop.h"
+
+#undef DEBUG_PUV3
+#include "hw/unicore32/puv3.h"
+
+#define TYPE_PUV3_OST "puv3_ost"
+#define PUV3_OST(obj) OBJECT_CHECK(PUV3OSTState, (obj), TYPE_PUV3_OST)
+
+/* puv3 ostimer implementation. */
+typedef struct PUV3OSTState {
+ SysBusDevice parent_obj;
+
+ MemoryRegion iomem;
+ QEMUBH *bh;
+ qemu_irq irq;
+ ptimer_state *ptimer;
+
+ uint32_t reg_OSMR0;
+ uint32_t reg_OSCR;
+ uint32_t reg_OSSR;
+ uint32_t reg_OIER;
+} PUV3OSTState;
+
+static uint64_t puv3_ost_read(void *opaque, hwaddr offset,
+ unsigned size)
+{
+ PUV3OSTState *s = opaque;
+ uint32_t ret = 0;
+
+ switch (offset) {
+ case 0x10: /* Counter Register */
+ ret = s->reg_OSMR0 - (uint32_t)ptimer_get_count(s->ptimer);
+ break;
+ case 0x14: /* Status Register */
+ ret = s->reg_OSSR;
+ break;
+ case 0x1c: /* Interrupt Enable Register */
+ ret = s->reg_OIER;
+ break;
+ default:
+ DPRINTF("Bad offset %x\n", (int)offset);
+ }
+ DPRINTF("offset 0x%x, value 0x%x\n", offset, ret);
+ return ret;
+}
+
+static void puv3_ost_write(void *opaque, hwaddr offset,
+ uint64_t value, unsigned size)
+{
+ PUV3OSTState *s = opaque;
+
+ DPRINTF("offset 0x%x, value 0x%x\n", offset, value);
+ switch (offset) {
+ case 0x00: /* Match Register 0 */
+ s->reg_OSMR0 = value;
+ if (s->reg_OSMR0 > s->reg_OSCR) {
+ ptimer_set_count(s->ptimer, s->reg_OSMR0 - s->reg_OSCR);
+ } else {
+ ptimer_set_count(s->ptimer, s->reg_OSMR0 +
+ (0xffffffff - s->reg_OSCR));
+ }
+ ptimer_run(s->ptimer, 2);
+ break;
+ case 0x14: /* Status Register */
+ assert(value == 0);
+ if (s->reg_OSSR) {
+ s->reg_OSSR = value;
+ qemu_irq_lower(s->irq);
+ }
+ break;
+ case 0x1c: /* Interrupt Enable Register */
+ s->reg_OIER = value;
+ break;
+ default:
+ DPRINTF("Bad offset %x\n", (int)offset);
+ }
+}
+
+static const MemoryRegionOps puv3_ost_ops = {
+ .read = puv3_ost_read,
+ .write = puv3_ost_write,
+ .impl = {
+ .min_access_size = 4,
+ .max_access_size = 4,
+ },
+ .endianness = DEVICE_NATIVE_ENDIAN,
+};
+
+static void puv3_ost_tick(void *opaque)
+{
+ PUV3OSTState *s = opaque;
+
+ DPRINTF("ost hit when ptimer counter from 0x%x to 0x%x!\n",
+ s->reg_OSCR, s->reg_OSMR0);
+
+ s->reg_OSCR = s->reg_OSMR0;
+ if (s->reg_OIER) {
+ s->reg_OSSR = 1;
+ qemu_irq_raise(s->irq);
+ }
+}
+
+static int puv3_ost_init(SysBusDevice *dev)
+{
+ PUV3OSTState *s = PUV3_OST(dev);
+
+ s->reg_OIER = 0;
+ s->reg_OSSR = 0;
+ s->reg_OSMR0 = 0;
+ s->reg_OSCR = 0;
+
+ sysbus_init_irq(dev, &s->irq);
+
+ s->bh = qemu_bh_new(puv3_ost_tick, s);
+ s->ptimer = ptimer_init(s->bh);
+ ptimer_set_freq(s->ptimer, 50 * 1000 * 1000);
+
+ memory_region_init_io(&s->iomem, OBJECT(s), &puv3_ost_ops, s, "puv3_ost",
+ PUV3_REGS_OFFSET);
+ sysbus_init_mmio(dev, &s->iomem);
+
+ return 0;
+}
+
+static void puv3_ost_class_init(ObjectClass *klass, void *data)
+{
+ SysBusDeviceClass *sdc = SYS_BUS_DEVICE_CLASS(klass);
+
+ sdc->init = puv3_ost_init;
+}
+
+static const TypeInfo puv3_ost_info = {
+ .name = TYPE_PUV3_OST,
+ .parent = TYPE_SYS_BUS_DEVICE,
+ .instance_size = sizeof(PUV3OSTState),
+ .class_init = puv3_ost_class_init,
+};
+
+static void puv3_ost_register_type(void)
+{
+ type_register_static(&puv3_ost_info);
+}
+
+type_init(puv3_ost_register_type)