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488cb996 GH |
1 | /* |
2 | * QEMU 16550A UART emulation | |
3 | * | |
4 | * Copyright (c) 2003-2004 Fabrice Bellard | |
5 | * Copyright (c) 2008 Citrix Systems, Inc. | |
6 | * | |
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: | |
13 | * | |
14 | * The above copyright notice and this permission notice shall be included in | |
15 | * all copies or substantial portions of the Software. | |
16 | * | |
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 | |
23 | * THE SOFTWARE. | |
24 | */ | |
cb9c377f PB |
25 | #ifndef HW_SERIAL_H |
26 | #define HW_SERIAL_H 1 | |
488cb996 | 27 | |
83c9f4ca | 28 | #include "hw/hw.h" |
9c17d615 | 29 | #include "sysemu/sysemu.h" |
022c62cb | 30 | #include "exec/memory.h" |
8e8638fa | 31 | #include "qemu/fifo8.h" |
488cb996 GH |
32 | |
33 | #define UART_FIFO_LENGTH 16 /* 16550A Fifo Length */ | |
34 | ||
488cb996 GH |
35 | struct SerialState { |
36 | uint16_t divider; | |
37 | uint8_t rbr; /* receive register */ | |
38 | uint8_t thr; /* transmit holding register */ | |
39 | uint8_t tsr; /* transmit shift register */ | |
40 | uint8_t ier; | |
41 | uint8_t iir; /* read only */ | |
42 | uint8_t lcr; | |
43 | uint8_t mcr; | |
44 | uint8_t lsr; /* read only */ | |
45 | uint8_t msr; /* read only */ | |
46 | uint8_t scr; | |
47 | uint8_t fcr; | |
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 */ | |
52 | int thr_ipending; | |
53 | qemu_irq irq; | |
54 | CharDriverState *chr; | |
55 | int last_break_enable; | |
56 | int it_shift; | |
57 | int baudbase; | |
58 | int tsr_retry; | |
59 | uint32_t wakeup; | |
60 | ||
61 | /* Time when the last byte was successfully sent out of the tsr */ | |
62 | uint64_t last_xmit_ts; | |
8e8638fa PC |
63 | Fifo8 recv_fifo; |
64 | Fifo8 xmit_fifo; | |
65 | /* Interrupt trigger level for recv_fifo */ | |
66 | uint8_t recv_fifo_itl; | |
488cb996 | 67 | |
1246b259 | 68 | QEMUTimer *fifo_timeout_timer; |
488cb996 | 69 | int timeout_ipending; /* timeout interrupt pending state */ |
488cb996 GH |
70 | |
71 | uint64_t char_transmit_time; /* time to transmit a char in ticks */ | |
72 | int poll_msl; | |
73 | ||
1246b259 | 74 | QEMUTimer *modem_status_poll; |
488cb996 GH |
75 | MemoryRegion io; |
76 | }; | |
77 | ||
78 | extern const VMStateDescription vmstate_serial; | |
79 | extern const MemoryRegionOps serial_io_ops; | |
80 | ||
db895a1e | 81 | void serial_realize_core(SerialState *s, Error **errp); |
419ad672 | 82 | void serial_exit_core(SerialState *s); |
488cb996 GH |
83 | void serial_set_frequency(SerialState *s, uint32_t frequency); |
84 | ||
85 | /* legacy pre qom */ | |
86 | SerialState *serial_init(int base, qemu_irq irq, int baudbase, | |
568fd159 | 87 | CharDriverState *chr, MemoryRegion *system_io); |
488cb996 | 88 | SerialState *serial_mm_init(MemoryRegion *address_space, |
a8170e5e | 89 | hwaddr base, int it_shift, |
488cb996 GH |
90 | qemu_irq irq, int baudbase, |
91 | CharDriverState *chr, enum device_endian end); | |
92 | ||
93 | /* serial-isa.c */ | |
eeceb084 | 94 | #define TYPE_ISA_SERIAL "isa-serial" |
488cb996 | 95 | bool serial_isa_init(ISABus *bus, int index, CharDriverState *chr); |
cb9c377f PB |
96 | |
97 | #endif |