[Qemu-devel] [RFC PATCH 06/11] introduce fixed-clock

[fred.konrad@greensocs.com]

From: KONRAD Frederic <fred.konrad@greensocs.com>

This is a fixed clock device.
It justs behave as an empty device with a parametrable output rate.

Signed-off-by: KONRAD Frederic <fred.konrad@greensocs.com>
---
 hw/misc/Makefile.objs         |  2 +
 hw/misc/fixed-clock.c         | 87 +++++++++++++++++++++++++++++++++++++++++++
 include/hw/misc/fixed-clock.h | 30 +++++++++++++++
 3 files changed, 119 insertions(+)
 create mode 100644 hw/misc/fixed-clock.c
 create mode 100644 include/hw/misc/fixed-clock.h

diff --git a/hw/misc/Makefile.objs b/hw/misc/Makefile.objs
index e504463..e8b8855 100644
--- a/hw/misc/Makefile.objs
+++ b/hw/misc/Makefile.objs
@@ -52,3 +52,5 @@ obj-$(CONFIG_MIPS_ITU) += mips_itu.o
 obj-$(CONFIG_PVPANIC) += pvpanic.o
 obj-$(CONFIG_EDU) += edu.o
 obj-$(CONFIG_HYPERV_TESTDEV) += hyperv_testdev.o
+
+obj-y += fixed-clock.o
diff --git a/hw/misc/fixed-clock.c b/hw/misc/fixed-clock.c
new file mode 100644
index 0000000..c273a91
--- /dev/null
+++ b/hw/misc/fixed-clock.c
@@ -0,0 +1,87 @@
+/*
+ * Fixed clock
+ *
+ *  Copyright (C) 2016 : GreenSocs Ltd
+ *      http://www.greensocs.com/ , email: info@greensocs.com
+ *
+ *  Frederic Konrad   <fred.konrad@greensocs.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, see <http://www.gnu.org/licenses/>.
+ *
+ */
+
+#include "qemu/osdep.h"
+#include "hw/qdev.h"
+#include "hw/misc/fixed-clock.h"
+#include "qemu/qemu-clock.h"
+#include "qapi/error.h"
+
+/* #define DEBUG_FIXED_CLOCK */
+
+#ifdef DEBUG_FIXED_CLOCK
+#define DPRINTF(fmt, ...) \
+do { printf("fixed-clock: " fmt , ## __VA_ARGS__); } while (0)
+#else
+#define DPRINTF(fmt, ...) do { } while (0)
+#endif
+
+typedef struct {
+    DeviceState parent_obj;
+
+    uint32_t rate;
+    struct qemu_clk out;
+} FixedClock;
+
+static Property fixed_clock_properties[] = {
+    DEFINE_PROP_UINT32("rate", FixedClock, rate, 0),
+    DEFINE_PROP_END_OF_LIST()
+};
+
+static void fixed_clock_realizefn(DeviceState *d, Error **errp)
+{
+    FixedClock *s = FIXED_CLOCK(d);
+
+    qemu_clk_update_rate(&s->out, s->rate);
+}
+
+static void fixed_clock_instance_init(Object *obj)
+{
+    FixedClock *s = FIXED_CLOCK(obj);
+
+    object_initialize(&s->out, sizeof(s->out), TYPE_CLOCK);
+    qemu_clk_attach_to_device(DEVICE(obj), &s->out, "clk_out");
+}
+
+static void fixed_clock_class_init(ObjectClass *klass, void *data)
+{
+    DeviceClass *dc = DEVICE_CLASS(klass);
+
+    dc->realize = fixed_clock_realizefn;
+    dc->props = fixed_clock_properties;
+}
+
+static const TypeInfo fixed_clock_info = {
+    .name          = TYPE_FIXED_CLOCK,
+    .parent        = TYPE_DEVICE,
+    .instance_size = sizeof(FixedClock),
+    .instance_init = fixed_clock_instance_init,
+    .class_init    = fixed_clock_class_init,
+};
+
+static void fixed_clock_register_types(void)
+{
+    type_register_static(&fixed_clock_info);
+}
+
+type_init(fixed_clock_register_types);
diff --git a/include/hw/misc/fixed-clock.h b/include/hw/misc/fixed-clock.h
new file mode 100644
index 0000000..1376444
--- /dev/null
+++ b/include/hw/misc/fixed-clock.h
@@ -0,0 +1,30 @@
+/*
+ * Fixed clock
+ *
+ *  Copyright (C) 2016 : GreenSocs Ltd
+ *      http://www.greensocs.com/ , email: info@greensocs.com
+ *
+ *  Frederic Konrad   <fred.konrad@greensocs.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, see <http://www.gnu.org/licenses/>.
+ *
+ */
+
+#ifndef FIXED_CLOCK_H
+#define FIXED_CLOCK_H
+
+#define TYPE_FIXED_CLOCK "fixed-clock"
+#define FIXED_CLOCK(obj) OBJECT_CHECK(FixedClock, (obj), TYPE_FIXED_CLOCK)
+
+#endif /* FIXED_CLOCK_H */
-- 
2.5.5