2
* QEMU 16550A UART emulation
4
* Copyright (c) 2003-2004 Fabrice Bellard
5
* Copyright (c) 2008 Citrix Systems, Inc.
7
* Permission is hereby granted, free of charge, to any person obtaining a copy
8
* of this software and associated documentation files (the "Software"), to deal
9
* in the Software without restriction, including without limitation the rights
10
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
11
* copies of the Software, and to permit persons to whom the Software is
12
* furnished to do so, subject to the following conditions:
14
* The above copyright notice and this permission notice shall be included in
15
* all copies or substantial portions of the Software.
17
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
18
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
19
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
20
* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
21
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
22
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
29
#include "sysemu/sysemu.h"
30
#include "exec/memory.h"
31
#include "qemu/fifo8.h"
33
#define UART_FIFO_LENGTH 16 /* 16550A Fifo Length */
37
uint8_t rbr; /* receive register */
38
uint8_t thr; /* transmit holding register */
39
uint8_t tsr; /* transmit shift register */
41
uint8_t iir; /* read only */
44
uint8_t lsr; /* read only */
45
uint8_t msr; /* read only */
48
uint8_t fcr_vmstate; /* we can't write directly this value
49
it has side effects */
50
/* NOTE: this hidden state is necessary for tx irq generation as
51
it can be reset while reading iir */
55
int last_break_enable;
61
/* Time when the last byte was successfully sent out of the tsr */
62
uint64_t last_xmit_ts;
65
/* Interrupt trigger level for recv_fifo */
66
uint8_t recv_fifo_itl;
68
struct QEMUTimer *fifo_timeout_timer;
69
int timeout_ipending; /* timeout interrupt pending state */
71
uint64_t char_transmit_time; /* time to transmit a char in ticks */
74
struct QEMUTimer *modem_status_poll;
78
extern const VMStateDescription vmstate_serial;
79
extern const MemoryRegionOps serial_io_ops;
81
void serial_realize_core(SerialState *s, Error **errp);
82
void serial_exit_core(SerialState *s);
83
void serial_set_frequency(SerialState *s, uint32_t frequency);
86
SerialState *serial_init(int base, qemu_irq irq, int baudbase,
87
CharDriverState *chr, MemoryRegion *system_io);
88
SerialState *serial_mm_init(MemoryRegion *address_space,
89
hwaddr base, int it_shift,
90
qemu_irq irq, int baudbase,
91
CharDriverState *chr, enum device_endian end);
94
#define TYPE_ISA_SERIAL "isa-serial"
95
bool serial_isa_init(ISABus *bus, int index, CharDriverState *chr);