block/export: Add query-block-exports
[qemu.git] / include / hw / char / avr_usart.h
1 /*
2 * AVR USART
3 *
4 * Copyright (c) 2018 University of Kent
5 * Author: Sarah Harris
6 *
7 * This library is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU Lesser General Public
9 * License as published by the Free Software Foundation; either
10 * version 2.1 of the License, or (at your option) any later version.
11 *
12 * This library is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 * Lesser General Public License for more details.
16 *
17 * You should have received a copy of the GNU Lesser General Public
18 * License along with this library; if not, see
19 * <http://www.gnu.org/licenses/lgpl-2.1.html>
20 */
21
22 #ifndef HW_CHAR_AVR_USART_H
23 #define HW_CHAR_AVR_USART_H
24
25 #include "hw/sysbus.h"
26 #include "chardev/char-fe.h"
27 #include "hw/hw.h"
28 #include "qom/object.h"
29
30 /* Offsets of registers. */
31 #define USART_DR 0x06
32 #define USART_CSRA 0x00
33 #define USART_CSRB 0x01
34 #define USART_CSRC 0x02
35 #define USART_BRRH 0x05
36 #define USART_BRRL 0x04
37
38 /* Relevant bits in regiters. */
39 #define USART_CSRA_RXC (1 << 7)
40 #define USART_CSRA_TXC (1 << 6)
41 #define USART_CSRA_DRE (1 << 5)
42 #define USART_CSRA_MPCM (1 << 0)
43
44 #define USART_CSRB_RXCIE (1 << 7)
45 #define USART_CSRB_TXCIE (1 << 6)
46 #define USART_CSRB_DREIE (1 << 5)
47 #define USART_CSRB_RXEN (1 << 4)
48 #define USART_CSRB_TXEN (1 << 3)
49 #define USART_CSRB_CSZ2 (1 << 2)
50 #define USART_CSRB_RXB8 (1 << 1)
51 #define USART_CSRB_TXB8 (1 << 0)
52
53 #define USART_CSRC_MSEL1 (1 << 7)
54 #define USART_CSRC_MSEL0 (1 << 6)
55 #define USART_CSRC_PM1 (1 << 5)
56 #define USART_CSRC_PM0 (1 << 4)
57 #define USART_CSRC_CSZ1 (1 << 2)
58 #define USART_CSRC_CSZ0 (1 << 1)
59
60 #define TYPE_AVR_USART "avr-usart"
61 OBJECT_DECLARE_SIMPLE_TYPE(AVRUsartState, AVR_USART)
62
63 struct AVRUsartState {
64 /* <private> */
65 SysBusDevice parent_obj;
66
67 /* <public> */
68 MemoryRegion mmio;
69
70 CharBackend chr;
71
72 bool enabled;
73
74 uint8_t data;
75 bool data_valid;
76 uint8_t char_mask;
77 /* Control and Status Registers */
78 uint8_t csra;
79 uint8_t csrb;
80 uint8_t csrc;
81 /* Baud Rate Registers (low/high byte) */
82 uint8_t brrh;
83 uint8_t brrl;
84
85 /* Receive Complete */
86 qemu_irq rxc_irq;
87 /* Transmit Complete */
88 qemu_irq txc_irq;
89 /* Data Register Empty */
90 qemu_irq dre_irq;
91 };
92
93 #endif /* HW_CHAR_AVR_USART_H */