[PATCH v41 13/21] hw/avr: Add dummy mask device

[Michael Rolnik]

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

Signed-off-by: Michael Rolnik <address@hidden>
---
 include/hw/misc/avr_mask.h |  47 ++++++++++++++++
 hw/misc/avr_mask.c         | 112 +++++++++++++++++++++++++++++++++++++
 hw/misc/Kconfig            |   3 +
 hw/misc/Makefile.objs      |   2 +
 4 files changed, 164 insertions(+)
 create mode 100644 include/hw/misc/avr_mask.h
 create mode 100644 hw/misc/avr_mask.c

diff --git a/include/hw/misc/avr_mask.h b/include/hw/misc/avr_mask.h
new file mode 100644
index 0000000000..d3e21972d8
--- /dev/null
+++ b/include/hw/misc/avr_mask.h
@@ -0,0 +1,47 @@
+/*
+ * AVR Power Reduction
+ *
+ * Copyright (c) 2019 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.
+ */
+
+#ifndef HW_avr_mask_H
+#define HW_avr_mask_H
+
+#include "hw/sysbus.h"
+#include "chardev/char-fe.h"
+#include "hw/hw.h"
+
+
+#define TYPE_AVR_MASK "avr-mask"
+#define AVR_MASK(obj) OBJECT_CHECK(AVRMaskState, (obj), TYPE_AVR_MASK)
+
+typedef struct {
+    /* <private> */
+    SysBusDevice parent_obj;
+
+    /* <public> */
+    MemoryRegion iomem;
+
+    uint8_t val;
+    qemu_irq irq[8];
+} AVRMaskState;
+
+#endif /* HW_avr_mask_H */
diff --git a/hw/misc/avr_mask.c b/hw/misc/avr_mask.c
new file mode 100644
index 0000000000..3af82ed9c1
--- /dev/null
+++ b/hw/misc/avr_mask.c
@@ -0,0 +1,112 @@
+/*
+ * AVR Power Reduction
+ *
+ * Copyright (c) 2019 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_mask.h"
+#include "qemu/log.h"
+#include "hw/qdev-properties.h"
+#include "hw/irq.h"
+
+#define DB_PRINT(fmt, args...) /* Nothing */
+/*#define DB_PRINT(fmt, args...) printf("%s: " fmt "\n", __func__, ## args)*/
+
+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;
+
+    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;
+
+    DB_PRINT("write %d to offset %d", val8, (uint8_t)offset);
+
+    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)
diff --git a/hw/misc/Kconfig b/hw/misc/Kconfig
index bdd77d8020..74a1e9a241 100644
--- a/hw/misc/Kconfig
+++ b/hw/misc/Kconfig
@@ -131,4 +131,7 @@ config MAC_VIA
     select MOS6522
     select ADB
 
+config AVR_MASK
+    bool
+
 source macio/Kconfig
diff --git a/hw/misc/Makefile.objs b/hw/misc/Makefile.objs
index da993f45b7..bbf17f651b 100644
--- a/hw/misc/Makefile.objs
+++ b/hw/misc/Makefile.objs
@@ -85,3 +85,5 @@ common-obj-$(CONFIG_NRF51_SOC) += nrf51_rng.o
 obj-$(CONFIG_MAC_VIA) += mac_via.o
 
 common-obj-$(CONFIG_GRLIB) += grlib_ahb_apb_pnp.o
+
+obj-$(CONFIG_AVR_MASK) += avr_mask.o
-- 
2.17.2 (Apple Git-113)