xref: /openbmc/qemu/include/hw/char/stm32f2xx_usart.h (revision e9f30b1e)
1 /*
2  * STM32F2XX USART
3  *
4  * Copyright (c) 2014 Alistair Francis <alistair@alistair23.me>
5  *
6  * Permission is hereby granted, free of charge, to any person obtaining a copy
7  * of this software and associated documentation files (the "Software"), to deal
8  * in the Software without restriction, including without limitation the rights
9  * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
10  * copies of the Software, and to permit persons to whom the Software is
11  * furnished to do so, subject to the following conditions:
12  *
13  * The above copyright notice and this permission notice shall be included in
14  * all copies or substantial portions of the Software.
15  *
16  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
17  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
18  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
19  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
20  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
21  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
22  * THE SOFTWARE.
23  */
24 
25 #ifndef HW_STM32F2XX_USART_H
26 #define HW_STM32F2XX_USART_H
27 
28 #include "hw/sysbus.h"
29 #include "chardev/char-fe.h"
30 #include "qom/object.h"
31 
32 #define USART_SR   0x00
33 #define USART_DR   0x04
34 #define USART_BRR  0x08
35 #define USART_CR1  0x0C
36 #define USART_CR2  0x10
37 #define USART_CR3  0x14
38 #define USART_GTPR 0x18
39 
40 /*
41  * NB: The reset value mentioned in "24.6.1 Status register" seems bogus.
42  * Looking at "Table 98 USART register map and reset values", it seems it
43  * should be 0xc0, and that's how real hardware behaves.
44  */
45 #define USART_SR_RESET (USART_SR_TXE | USART_SR_TC)
46 
47 #define USART_SR_TXE  (1 << 7)
48 #define USART_SR_TC   (1 << 6)
49 #define USART_SR_RXNE (1 << 5)
50 
51 #define USART_CR1_UE     (1 << 13)
52 #define USART_CR1_TXEIE  (1 << 7)
53 #define USART_CR1_TCEIE  (1 << 6)
54 #define USART_CR1_RXNEIE (1 << 5)
55 #define USART_CR1_TE     (1 << 3)
56 #define USART_CR1_RE     (1 << 2)
57 
58 #define TYPE_STM32F2XX_USART "stm32f2xx-usart"
59 OBJECT_DECLARE_SIMPLE_TYPE(STM32F2XXUsartState, STM32F2XX_USART)
60 
61 struct STM32F2XXUsartState {
62     /* <private> */
63     SysBusDevice parent_obj;
64 
65     /* <public> */
66     MemoryRegion mmio;
67 
68     uint32_t usart_sr;
69     uint32_t usart_dr;
70     uint32_t usart_brr;
71     uint32_t usart_cr1;
72     uint32_t usart_cr2;
73     uint32_t usart_cr3;
74     uint32_t usart_gtpr;
75 
76     CharBackend chr;
77     qemu_irq irq;
78 };
79 #endif /* HW_STM32F2XX_USART_H */
80