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9c0c156b MF |
1 | /* UART model. |
2 | ||
3666a048 | 3 | Copyright (C) 1996-2021 Free Software Foundation, Inc. |
9c0c156b MF |
4 | Contributed by Cygnus Solutions and Mike Frysinger. |
5 | ||
6 | This file is part of simulators. | |
7 | ||
8 | This program is free software; you can redistribute it and/or modify | |
9 | it under the terms of the GNU General Public License as published by | |
10 | the Free Software Foundation; either version 3 of the License, or | |
11 | (at your option) any later version. | |
12 | ||
13 | This program is distributed in the hope that it will be useful, | |
14 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
15 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
16 | GNU General Public License for more details. | |
17 | ||
18 | You should have received a copy of the GNU General Public License | |
19 | along with this program. If not, see <http://www.gnu.org/licenses/>. */ | |
20 | ||
6df01ab8 MF |
21 | /* This must come before any other includes. */ |
22 | #include "defs.h" | |
9c0c156b MF |
23 | |
24 | #include "sim-main.h" | |
25 | #include "hw-main.h" | |
26 | ||
27 | #include "dv-sockser.h" | |
28 | #include "dv-m32r_uart.h" | |
29 | ||
30 | struct m32r_uart | |
31 | { | |
32 | }; | |
33 | ||
34 | static unsigned | |
35 | m32r_uart_io_write_buffer (struct hw *me, const void *source, | |
36 | int space, address_word addr, unsigned nr_bytes) | |
37 | { | |
38 | SIM_DESC sd = hw_system (me); | |
39 | struct m32r_uart *uart = hw_data (me); | |
40 | int status = dv_sockser_status (sd); | |
41 | ||
42 | switch (addr) | |
43 | { | |
44 | case UART_OUTCHAR_ADDR: | |
45 | if (status & DV_SOCKSER_DISCONNECTED) | |
46 | { | |
47 | sim_io_write_stdout (sd, source, nr_bytes); | |
48 | sim_io_flush_stdout (sd); | |
49 | } | |
50 | else | |
51 | { | |
52 | /* Normalize errors to a value of 0. */ | |
53 | int ret = dv_sockser_write_buffer (sd, source, nr_bytes); | |
54 | if (ret < 0) | |
55 | nr_bytes = 0; | |
56 | } | |
57 | break; | |
58 | } | |
59 | ||
60 | return nr_bytes; | |
61 | } | |
62 | ||
63 | static unsigned | |
64 | m32r_uart_io_read_buffer (struct hw *me, void *dest, | |
65 | int space, address_word addr, unsigned nr_bytes) | |
66 | { | |
67 | SIM_DESC sd = hw_system (me); | |
68 | struct m32r_uart *uart = hw_data (me); | |
69 | int status = dv_sockser_status (sd); | |
70 | ||
71 | switch (addr) | |
72 | { | |
73 | case UART_INCHAR_ADDR: | |
74 | if (status & DV_SOCKSER_DISCONNECTED) | |
75 | { | |
76 | int ret = sim_io_poll_read (sd, 0/*STDIN*/, dest, 1); | |
77 | return (ret < 0) ? 0 : 1; | |
78 | } | |
79 | else | |
80 | { | |
81 | char *buffer = dest; | |
82 | buffer[0] = dv_sockser_read (sd); | |
83 | return 1; | |
84 | } | |
85 | case UART_STATUS_ADDR: | |
86 | { | |
87 | unsigned char *p = dest; | |
88 | p[0] = 0; | |
89 | p[1] = (((status & DV_SOCKSER_INPUT_EMPTY) | |
90 | #ifdef UART_INPUT_READY0 | |
91 | ? UART_INPUT_READY : 0) | |
92 | #else | |
93 | ? 0 : UART_INPUT_READY) | |
94 | #endif | |
95 | + ((status & DV_SOCKSER_OUTPUT_EMPTY) ? UART_OUTPUT_READY : 0)); | |
96 | return 2; | |
97 | } | |
98 | } | |
99 | ||
100 | return nr_bytes; | |
101 | } | |
102 | ||
103 | static void | |
104 | attach_m32r_uart_regs (struct hw *me, struct m32r_uart *uart) | |
105 | { | |
106 | address_word attach_address; | |
107 | int attach_space; | |
108 | unsigned attach_size; | |
109 | reg_property_spec reg; | |
110 | ||
111 | if (hw_find_property (me, "reg") == NULL) | |
112 | hw_abort (me, "Missing \"reg\" property"); | |
113 | ||
114 | if (!hw_find_reg_array_property (me, "reg", 0, ®)) | |
115 | hw_abort (me, "\"reg\" property must contain three addr/size entries"); | |
116 | ||
117 | hw_unit_address_to_attach_address (hw_parent (me), | |
118 | ®.address, | |
119 | &attach_space, &attach_address, me); | |
120 | hw_unit_size_to_attach_size (hw_parent (me), ®.size, &attach_size, me); | |
121 | ||
122 | hw_attach_address (hw_parent (me), | |
123 | 0, attach_space, attach_address, attach_size, me); | |
124 | } | |
125 | ||
126 | static void | |
127 | m32r_uart_finish (struct hw *me) | |
128 | { | |
129 | struct m32r_uart *uart; | |
130 | ||
131 | uart = HW_ZALLOC (me, struct m32r_uart); | |
132 | ||
133 | set_hw_data (me, uart); | |
134 | set_hw_io_read_buffer (me, m32r_uart_io_read_buffer); | |
135 | set_hw_io_write_buffer (me, m32r_uart_io_write_buffer); | |
136 | ||
137 | attach_m32r_uart_regs (me, uart); | |
138 | } | |
139 | ||
140 | const struct hw_descriptor dv_m32r_uart_descriptor[] = | |
141 | { | |
142 | {"m32r_uart", m32r_uart_finish,}, | |
143 | {NULL, NULL}, | |
144 | }; |