1 files changed, 150 insertions, 0 deletions
diff --git a/hw/syborg_rtc.c b/hw/syborg_rtc.c
new file mode 100644
index 0000000..329aa42
--- /dev/null
+++ b/hw/syborg_rtc.c
@@ -0,0 +1,150 @@
+/*
+ * Syborg RTC
+ *
+ * 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 "qemu-timer.h"
+#include "syborg.h"
+
+enum {
+    RTC_ID        = 0,
+    RTC_LATCH     = 1,
+    RTC_DATA_LOW  = 2,
+    RTC_DATA_HIGH = 3
+};
+
+typedef struct {
+    SysBusDevice busdev;
+    int64_t offset;
+    int64_t data;
+    qemu_irq irq;
+} SyborgRTCState;
+
+static uint32_t syborg_rtc_read(void *opaque, target_phys_addr_t offset)
+{
+    SyborgRTCState *s = (SyborgRTCState *)opaque;
+    offset &= 0xfff;
+    switch (offset >> 2) {
+    case RTC_ID:
+        return SYBORG_ID_RTC;
+    case RTC_DATA_LOW:
+        return (uint32_t)s->data;
+    case RTC_DATA_HIGH:
+        return (uint32_t)(s->data >> 32);
+    default:
+        cpu_abort(cpu_single_env, "syborg_rtc_read: Bad offset %x\n",
+                  (int)offset);
+        return 0;
+    }
+}
+
+static void syborg_rtc_write(void *opaque, target_phys_addr_t offset, uint32_t value)
+{
+    SyborgRTCState *s = (SyborgRTCState *)opaque;
+    uint64_t now;
+
+    offset &= 0xfff;
+    switch (offset >> 2) {
+    case RTC_LATCH:
+        now = qemu_get_clock(vm_clock);
+        if (value >= 4) {
+            s->offset = s->data - now;
+        } else {
+            s->data = now + s->offset;
+            while (value) {
+                s->data /= 1000;
+                value--;
+            }
+        }
+        break;
+    case RTC_DATA_LOW:
+        s->data = (s->data & ~(uint64_t)0xffffffffu) | value;
+        break;
+    case RTC_DATA_HIGH:
+        s->data = (s->data & 0xffffffffu) | ((uint64_t)value << 32);
+        break;
+    default:
+        cpu_abort(cpu_single_env, "syborg_rtc_write: Bad offset %x\n",
+                  (int)offset);
+        break;
+    }
+}
+
+static CPUReadMemoryFunc * const syborg_rtc_readfn[] = {
+    syborg_rtc_read,
+    syborg_rtc_read,
+    syborg_rtc_read
+};
+
+static CPUWriteMemoryFunc * const syborg_rtc_writefn[] = {
+    syborg_rtc_write,
+    syborg_rtc_write,
+    syborg_rtc_write
+};
+
+static void syborg_rtc_save(QEMUFile *f, void *opaque)
+{
+    SyborgRTCState *s = opaque;
+
+    qemu_put_be64(f, s->offset);
+    qemu_put_be64(f, s->data);
+}
+
+static int syborg_rtc_load(QEMUFile *f, void *opaque, int version_id)
+{
+    SyborgRTCState *s = opaque;
+
+    if (version_id != 1)
+        return -EINVAL;
+
+    s->offset = qemu_get_be64(f);
+    s->data = qemu_get_be64(f);
+
+    return 0;
+}
+
+static int syborg_rtc_init(SysBusDevice *dev)
+{
+    SyborgRTCState *s = FROM_SYSBUS(SyborgRTCState, dev);
+    struct tm tm;
+    int iomemtype;
+
+    iomemtype = cpu_register_io_memory(syborg_rtc_readfn,
+                                       syborg_rtc_writefn, s,
+                                       DEVICE_NATIVE_ENDIAN);
+    sysbus_init_mmio(dev, 0x1000, iomemtype);
+
+    qemu_get_timedate(&tm, 0);
+    s->offset = (uint64_t)mktime(&tm) * 1000000000;
+
+    register_savevm(&dev->qdev, "syborg_rtc", -1, 1,
+                    syborg_rtc_save, syborg_rtc_load, s);
+    return 0;
+}
+
+static void syborg_rtc_register_devices(void)
+{
+    sysbus_register_dev("syborg,rtc", sizeof(SyborgRTCState), syborg_rtc_init);
+}
+
+device_init(syborg_rtc_register_devices)