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hw/misc: avr: Add limited support for power reduction device

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This is a simple device of just one register, and whenever this
register is written to it calls qemu_set_irq function for each
of 8 bits/IRQs. It is used to implement AVR Power Reduction.

[AM: Remove word 'Atmel' from filenames and all elements of code]
Suggested-by: Aleksandar Markovic <aleksandar.m.mail@gmail.com>
Signed-off-by: Michael Rolnik <mrolnik@gmail.com>
Signed-off-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
[rth: Squash include fix and file rename from f4bug]
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
Signed-off-by: Aleksandar Markovic <aleksandar.m.mail@gmail.com>
Reviewed-by: Alex Bennée <alex.bennee@linaro.org>
Signed-off-by: Thomas Huth <huth@tuxfamily.org>
Message-Id: <20200705140315.260514-22-huth@tuxfamily.org>
This commit is contained in:
Michael Rolnik 2020-01-24 01:51:19 +01:00 • committed by Philippe Mathieu-Daudé
parent 8ff47bc1a0
commit dc288de082
6 changed files with 170 additions and 0 deletions
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113
hw/misc/avr_power.c Normal file
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/*
* AVR Power Reduction Management
*
* Copyright (c) 2019-2020 Michael Rolnik
*
* 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 "qemu/osdep.h"
#include "hw/misc/avr_power.h"
#include "qemu/log.h"
#include "hw/qdev-properties.h"
#include "hw/irq.h"
#include "trace.h"
static void avr_mask_reset(DeviceState *dev)
{
AVRMaskState *s = AVR_MASK(dev);
s->val = 0x00;
for (int i = 0; i < 8; i++) {
qemu_set_irq(s->irq[i], 0);
}
}
static uint64_t avr_mask_read(void *opaque, hwaddr offset, unsigned size)
{
assert(size == 1);
assert(offset == 0);
AVRMaskState *s = opaque;
trace_avr_power_read(s->val);
return (uint64_t)s->val;
}
static void avr_mask_write(void *opaque, hwaddr offset,
uint64_t val64, unsigned size)
{
assert(size == 1);
assert(offset == 0);
AVRMaskState *s = opaque;
uint8_t val8 = val64;
trace_avr_power_write(val8);
s->val = val8;
for (int i = 0; i < 8; i++) {
qemu_set_irq(s->irq[i], (val8 & (1 << i)) != 0);
}
}
static const MemoryRegionOps avr_mask_ops = {
.read = avr_mask_read,
.write = avr_mask_write,
.endianness = DEVICE_NATIVE_ENDIAN,
.impl = {
.max_access_size = 1,
},
};
static void avr_mask_init(Object *dev)
{
AVRMaskState *s = AVR_MASK(dev);
SysBusDevice *busdev = SYS_BUS_DEVICE(dev);
memory_region_init_io(&s->iomem, dev, &avr_mask_ops, s, TYPE_AVR_MASK,
0x01);
sysbus_init_mmio(busdev, &s->iomem);
for (int i = 0; i < 8; i++) {
sysbus_init_irq(busdev, &s->irq[i]);
}
s->val = 0x00;
}
static void avr_mask_class_init(ObjectClass *klass, void *data)
{
DeviceClass *dc = DEVICE_CLASS(klass);
dc->reset = avr_mask_reset;
}
static const TypeInfo avr_mask_info = {
.name = TYPE_AVR_MASK,
.parent = TYPE_SYS_BUS_DEVICE,
.instance_size = sizeof(AVRMaskState),
.class_init = avr_mask_class_init,
.instance_init = avr_mask_init,
};
static void avr_mask_register_types(void)
{
type_register_static(&avr_mask_info);
}
type_init(avr_mask_register_types)