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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 | ||
21 | #include "config.h" | |
22 | ||
23 | #include "sim-main.h" | |
24 | #include "hw-main.h" | |
25 | ||
26 | #include "dv-sockser.h" | |
27 | #include "dv-m32r_uart.h" | |
28 | ||
29 | struct m32r_uart | |
30 | { | |
31 | }; | |
32 | ||
33 | static unsigned | |
34 | m32r_uart_io_write_buffer (struct hw *me, const void *source, | |
35 | int space, address_word addr, unsigned nr_bytes) | |
36 | { | |
37 | SIM_DESC sd = hw_system (me); | |
38 | struct m32r_uart *uart = hw_data (me); | |
39 | int status = dv_sockser_status (sd); | |
40 | ||
41 | switch (addr) | |
42 | { | |
43 | case UART_OUTCHAR_ADDR: | |
44 | if (status & DV_SOCKSER_DISCONNECTED) | |
45 | { | |
46 | sim_io_write_stdout (sd, source, nr_bytes); | |
47 | sim_io_flush_stdout (sd); | |
48 | } | |
49 | else | |
50 | { | |
51 | /* Normalize errors to a value of 0. */ | |
52 | int ret = dv_sockser_write_buffer (sd, source, nr_bytes); | |
53 | if (ret < 0) | |
54 | nr_bytes = 0; | |
55 | } | |
56 | break; | |
57 | } | |
58 | ||
59 | return nr_bytes; | |
60 | } | |
61 | ||
62 | static unsigned | |
63 | m32r_uart_io_read_buffer (struct hw *me, void *dest, | |
64 | int space, address_word addr, unsigned nr_bytes) | |
65 | { | |
66 | SIM_DESC sd = hw_system (me); | |
67 | struct m32r_uart *uart = hw_data (me); | |
68 | int status = dv_sockser_status (sd); | |
69 | ||
70 | switch (addr) | |
71 | { | |
72 | case UART_INCHAR_ADDR: | |
73 | if (status & DV_SOCKSER_DISCONNECTED) | |
74 | { | |
75 | int ret = sim_io_poll_read (sd, 0/*STDIN*/, dest, 1); | |
76 | return (ret < 0) ? 0 : 1; | |
77 | } | |
78 | else | |
79 | { | |
80 | char *buffer = dest; | |
81 | buffer[0] = dv_sockser_read (sd); | |
82 | return 1; | |
83 | } | |
84 | case UART_STATUS_ADDR: | |
85 | { | |
86 | unsigned char *p = dest; | |
87 | p[0] = 0; | |
88 | p[1] = (((status & DV_SOCKSER_INPUT_EMPTY) | |
89 | #ifdef UART_INPUT_READY0 | |
90 | ? UART_INPUT_READY : 0) | |
91 | #else | |
92 | ? 0 : UART_INPUT_READY) | |
93 | #endif | |
94 | + ((status & DV_SOCKSER_OUTPUT_EMPTY) ? UART_OUTPUT_READY : 0)); | |
95 | return 2; | |
96 | } | |
97 | } | |
98 | ||
99 | return nr_bytes; | |
100 | } | |
101 | ||
102 | static void | |
103 | attach_m32r_uart_regs (struct hw *me, struct m32r_uart *uart) | |
104 | { | |
105 | address_word attach_address; | |
106 | int attach_space; | |
107 | unsigned attach_size; | |
108 | reg_property_spec reg; | |
109 | ||
110 | if (hw_find_property (me, "reg") == NULL) | |
111 | hw_abort (me, "Missing \"reg\" property"); | |
112 | ||
113 | if (!hw_find_reg_array_property (me, "reg", 0, ®)) | |
114 | hw_abort (me, "\"reg\" property must contain three addr/size entries"); | |
115 | ||
116 | hw_unit_address_to_attach_address (hw_parent (me), | |
117 | ®.address, | |
118 | &attach_space, &attach_address, me); | |
119 | hw_unit_size_to_attach_size (hw_parent (me), ®.size, &attach_size, me); | |
120 | ||
121 | hw_attach_address (hw_parent (me), | |
122 | 0, attach_space, attach_address, attach_size, me); | |
123 | } | |
124 | ||
125 | static void | |
126 | m32r_uart_finish (struct hw *me) | |
127 | { | |
128 | struct m32r_uart *uart; | |
129 | ||
130 | uart = HW_ZALLOC (me, struct m32r_uart); | |
131 | ||
132 | set_hw_data (me, uart); | |
133 | set_hw_io_read_buffer (me, m32r_uart_io_read_buffer); | |
134 | set_hw_io_write_buffer (me, m32r_uart_io_write_buffer); | |
135 | ||
136 | attach_m32r_uart_regs (me, uart); | |
137 | } | |
138 | ||
139 | const struct hw_descriptor dv_m32r_uart_descriptor[] = | |
140 | { | |
141 | {"m32r_uart", m32r_uart_finish,}, | |
142 | {NULL, NULL}, | |
143 | }; |