linux-user: stack_base is now mandatory on all targets
[qemu.git] / hw / lm32_juart.c
1 /*
2 * LatticeMico32 JTAG UART model.
3 *
4 * Copyright (c) 2010 Michael Walle <michael@walle.cc>
5 *
6 * This library is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU Lesser General Public
8 * License as published by the Free Software Foundation; either
9 * version 2 of the License, or (at your option) any later version.
10 *
11 * This library is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 * Lesser General Public License for more details.
15 *
16 * You should have received a copy of the GNU Lesser General Public
17 * License along with this library; if not, see <http://www.gnu.org/licenses/>.
18 */
19
20 #include "hw.h"
21 #include "sysbus.h"
22 #include "trace.h"
23 #include "qemu-char.h"
24
25 #include "lm32_juart.h"
26
27 enum {
28 LM32_JUART_MIN_SAVE_VERSION = 0,
29 LM32_JUART_CURRENT_SAVE_VERSION = 0,
30 LM32_JUART_MAX_SAVE_VERSION = 0,
31 };
32
33 enum {
34 JTX_FULL = (1<<8),
35 };
36
37 enum {
38 JRX_FULL = (1<<8),
39 };
40
41 struct LM32JuartState {
42 SysBusDevice busdev;
43 CharDriverState *chr;
44
45 uint32_t jtx;
46 uint32_t jrx;
47 };
48 typedef struct LM32JuartState LM32JuartState;
49
50 uint32_t lm32_juart_get_jtx(DeviceState *d)
51 {
52 LM32JuartState *s = container_of(d, LM32JuartState, busdev.qdev);
53
54 trace_lm32_juart_get_jtx(s->jtx);
55 return s->jtx;
56 }
57
58 uint32_t lm32_juart_get_jrx(DeviceState *d)
59 {
60 LM32JuartState *s = container_of(d, LM32JuartState, busdev.qdev);
61
62 trace_lm32_juart_get_jrx(s->jrx);
63 return s->jrx;
64 }
65
66 void lm32_juart_set_jtx(DeviceState *d, uint32_t jtx)
67 {
68 LM32JuartState *s = container_of(d, LM32JuartState, busdev.qdev);
69 unsigned char ch = jtx & 0xff;
70
71 trace_lm32_juart_set_jtx(s->jtx);
72
73 s->jtx = jtx;
74 if (s->chr) {
75 qemu_chr_fe_write(s->chr, &ch, 1);
76 }
77 }
78
79 void lm32_juart_set_jrx(DeviceState *d, uint32_t jtx)
80 {
81 LM32JuartState *s = container_of(d, LM32JuartState, busdev.qdev);
82
83 trace_lm32_juart_set_jrx(s->jrx);
84 s->jrx &= ~JRX_FULL;
85 }
86
87 static void juart_rx(void *opaque, const uint8_t *buf, int size)
88 {
89 LM32JuartState *s = opaque;
90
91 s->jrx = *buf | JRX_FULL;
92 }
93
94 static int juart_can_rx(void *opaque)
95 {
96 LM32JuartState *s = opaque;
97
98 return !(s->jrx & JRX_FULL);
99 }
100
101 static void juart_event(void *opaque, int event)
102 {
103 }
104
105 static void juart_reset(DeviceState *d)
106 {
107 LM32JuartState *s = container_of(d, LM32JuartState, busdev.qdev);
108
109 s->jtx = 0;
110 s->jrx = 0;
111 }
112
113 static int lm32_juart_init(SysBusDevice *dev)
114 {
115 LM32JuartState *s = FROM_SYSBUS(typeof(*s), dev);
116
117 s->chr = qdev_init_chardev(&dev->qdev);
118 if (s->chr) {
119 qemu_chr_add_handlers(s->chr, juart_can_rx, juart_rx, juart_event, s);
120 }
121
122 return 0;
123 }
124
125 static const VMStateDescription vmstate_lm32_juart = {
126 .name = "lm32-juart",
127 .version_id = 1,
128 .minimum_version_id = 1,
129 .minimum_version_id_old = 1,
130 .fields = (VMStateField[]) {
131 VMSTATE_UINT32(jtx, LM32JuartState),
132 VMSTATE_UINT32(jrx, LM32JuartState),
133 VMSTATE_END_OF_LIST()
134 }
135 };
136
137 static void lm32_juart_class_init(ObjectClass *klass, void *data)
138 {
139 SysBusDeviceClass *k = SYS_BUS_DEVICE_CLASS(klass);
140
141 k->init = lm32_juart_init;
142 }
143
144 static DeviceInfo lm32_juart_info = {
145 .name = "lm32-juart",
146 .size = sizeof(LM32JuartState),
147 .vmsd = &vmstate_lm32_juart,
148 .reset = juart_reset,
149 .class_init = lm32_juart_class_init,
150 };
151
152 static void lm32_juart_register(void)
153 {
154 sysbus_register_withprop(&lm32_juart_info);
155 }
156
157 device_init(lm32_juart_register)