From: Sarah Harris <address@hidden>
These were designed to facilitate testing but should provide enough function to
be useful in other contexts.
Only a subset of the functions of each peripheral is implemented, mainly due to
the lack of a standard way to handle electrical connections (like GPIO pins).
Signed-off-by: Sarah Harris <address@hidden>
---
include/hw/char/avr_usart.h | 97 ++++++
include/hw/misc/avr_mask.h | 47 +++
include/hw/timer/avr_timer16.h | 97 ++++++
hw/char/avr_usart.c | 324 ++++++++++++++++++
hw/misc/avr_mask.c | 112 ++++++
hw/timer/avr_timer16.c | 605 +++++++++++++++++++++++++++++++++
hw/char/Kconfig | 3 +
hw/char/Makefile.objs | 1 +
hw/misc/Kconfig | 3 +
hw/misc/Makefile.objs | 2 +
hw/timer/Kconfig | 3 +
hw/timer/Makefile.objs | 2 +
12 files changed, 1296 insertions(+)
create mode 100644 include/hw/char/avr_usart.h
create mode 100644 include/hw/misc/avr_mask.h
create mode 100644 include/hw/timer/avr_timer16.h
create mode 100644 hw/char/avr_usart.c
create mode 100644 hw/misc/avr_mask.c
create mode 100644 hw/timer/avr_timer16.c
diff --git a/include/hw/char/avr_usart.h b/include/hw/char/avr_usart.h
new file mode 100644
index 0000000000..8e9ee88bbd
--- /dev/null
+++ b/include/hw/char/avr_usart.h
@@ -0,0 +1,97 @@
+/*
+ * AVR USART
+ *
+ * Copyright (c) 2018 University of Kent
+ * Author: Sarah Harris
+ *
+ * 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_USART_H
+#define HW_AVR_USART_H
+
+#include "hw/sysbus.h"
+#include "chardev/char-fe.h"
+#include "hw/hw.h"
+
+/* Offsets of registers. */
+#define USART_DR 0x06
+#define USART_CSRA 0x00
+#define USART_CSRB 0x01
+#define USART_CSRC 0x02
+#define USART_BRRH 0x05
+#define USART_BRRL 0x04
+
+/* Relevant bits in regiters. */
+#define USART_CSRA_RXC (1 << 7)
+#define USART_CSRA_TXC (1 << 6)
+#define USART_CSRA_DRE (1 << 5)
+#define USART_CSRA_MPCM (1 << 0)
+
+#define USART_CSRB_RXCIE (1 << 7)
+#define USART_CSRB_TXCIE (1 << 6)
+#define USART_CSRB_DREIE (1 << 5)
+#define USART_CSRB_RXEN (1 << 4)
+#define USART_CSRB_TXEN (1 << 3)
+#define USART_CSRB_CSZ2 (1 << 2)
+#define USART_CSRB_RXB8 (1 << 1)
+#define USART_CSRB_TXB8 (1 << 0)
+
+#define USART_CSRC_MSEL1 (1 << 7)
+#define USART_CSRC_MSEL0 (1 << 6)
+#define USART_CSRC_PM1 (1 << 5)
+#define USART_CSRC_PM0 (1 << 4)
+#define USART_CSRC_CSZ1 (1 << 2)
+#define USART_CSRC_CSZ0 (1 << 1)
+#define TYPE_AVR_USART "avr-usart"
+#define AVR_USART(obj) \
+ OBJECT_CHECK(AVRUsartState, (obj), TYPE_AVR_USART)
+
+typedef struct {
+ /* <private> */
+ SysBusDevice parent_obj;
+
+ /* <public> */
+ MemoryRegion mmio;
+
+ CharBackend chr;
+
+ bool enabled;
+
+ uint8_t data;
+ bool data_valid;
+ uint8_t char_mask;
+ /* Control and Status Registers */
+ uint8_t csra;
+ uint8_t csrb;
+ uint8_t csrc;
+ /* Baud Rate Registers (low/high byte) */
+ uint8_t brrh;
+ uint8_t brrl;
+
+ /* Receive Complete */
+ qemu_irq rxc_irq;
+ /* Transmit Complete */
+ qemu_irq txc_irq;
+ /* Data Register Empty */
+ qemu_irq dre_irq;
+} AVRUsartState;