1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
|
/*
* QEMU 16550A UART emulation
*
* Copyright (c) 2003-2004 Fabrice Bellard
* Copyright (c) 2008 Citrix Systems, Inc.
*
* 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 "hw.h"
#include "sysemu.h"
#include "memory.h"
#define UART_FIFO_LENGTH 16 /* 16550A Fifo Length */
typedef struct SerialFIFO {
uint8_t data[UART_FIFO_LENGTH];
uint8_t count;
uint8_t itl; /* Interrupt Trigger Level */
uint8_t tail;
uint8_t head;
} SerialFIFO;
struct SerialState {
uint16_t divider;
uint8_t rbr; /* receive register */
uint8_t thr; /* transmit holding register */
uint8_t tsr; /* transmit shift register */
uint8_t ier;
uint8_t iir; /* read only */
uint8_t lcr;
uint8_t mcr;
uint8_t lsr; /* read only */
uint8_t msr; /* read only */
uint8_t scr;
uint8_t fcr;
uint8_t fcr_vmstate; /* we can't write directly this value
it has side effects */
/* NOTE: this hidden state is necessary for tx irq generation as
it can be reset while reading iir */
int thr_ipending;
qemu_irq irq;
CharDriverState *chr;
int last_break_enable;
int it_shift;
int baudbase;
int tsr_retry;
uint32_t wakeup;
/* Time when the last byte was successfully sent out of the tsr */
uint64_t last_xmit_ts;
SerialFIFO recv_fifo;
SerialFIFO xmit_fifo;
struct QEMUTimer *fifo_timeout_timer;
int timeout_ipending; /* timeout interrupt pending state */
struct QEMUTimer *transmit_timer;
uint64_t char_transmit_time; /* time to transmit a char in ticks */
int poll_msl;
struct QEMUTimer *modem_status_poll;
MemoryRegion io;
};
extern const VMStateDescription vmstate_serial;
extern const MemoryRegionOps serial_io_ops;
void serial_init_core(SerialState *s);
void serial_exit_core(SerialState *s);
void serial_set_frequency(SerialState *s, uint32_t frequency);
/* legacy pre qom */
SerialState *serial_init(int base, qemu_irq irq, int baudbase,
CharDriverState *chr, MemoryRegion *system_io);
SerialState *serial_mm_init(MemoryRegion *address_space,
hwaddr base, int it_shift,
qemu_irq irq, int baudbase,
CharDriverState *chr, enum device_endian end);
/* serial-isa.c */
bool serial_isa_init(ISABus *bus, int index, CharDriverState *chr);
|
