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

[Alistair Francis <alistair.francis@xilinx.com>]

On Tue, Aug 2, 2016 at 4:56 AM, KONRAD Frederic
<fred.konrad@greensocs.com> wrote:
>
>
> Le 02/07/2016 à 01:07, Alistair Francis a écrit :
>>
>> On Mon, Jun 13, 2016 at 9:27 AM,  <fred.konrad@greensocs.com> wrote:
>>>
>>> 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 */
>>
>> Don't include this.
>>
>>> +
>>> +#ifdef DEBUG_FIXED_CLOCK
>>> +#define DPRINTF(fmt, ...) \
>>> +do { printf("fixed-clock: " fmt , ## __VA_ARGS__); } while (0)
>>
>> It might be better to use __func__ here.
>>
>> It should also be qemu_log instead of printf().
>>
>>> +#else
>>> +#define DPRINTF(fmt, ...) do { } while (0)
>>> +#endif
>>> +
>>> +typedef struct {
>>> +    DeviceState parent_obj;
>>> +
>>> +    uint32_t rate;
>>> +    struct qemu_clk out;
>>> +} FixedClock;
>>
>> Doesn't this need to be in the header file?
>
>
> I think it's not necessary as we get the clock through the API?

True, I always assumed it was general convention, although I noticed
that the qemu_irq infrastructure does it like this. So I don't think
it matters.

Thanks,

Alistair

>
>>
>>> +
>>> +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)
>>
>> dev instead of d
>>
>> Thanks,
>>
>> Alistair
>>
>>> +{
>>> +    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
>>>
>>>
>
>