1 /* Copyright (C) 2007-2008 The Android Open Source Project
2 **
3 ** This software is licensed under the terms of the GNU General Public
4 ** License version 2, as published by the Free Software Foundation, and
5 ** may be copied, distributed, and modified under those terms.
6 **
7 ** This program is distributed in the hope that it will be useful,
8 ** but WITHOUT ANY WARRANTY; without even the implied warranty of
9 ** MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
10 ** GNU General Public License for more details.
11 */
12 #include "qemu_file.h"
13 #include "qemu-char.h"
14 #include "goldfish_device.h"
15
16 enum {
17 TTY_PUT_CHAR = 0x00,
18 TTY_BYTES_READY = 0x04,
19 TTY_CMD = 0x08,
20
21 TTY_DATA_PTR = 0x10,
22 TTY_DATA_LEN = 0x14,
23
24 TTY_CMD_INT_DISABLE = 0,
25 TTY_CMD_INT_ENABLE = 1,
26 TTY_CMD_WRITE_BUFFER = 2,
27 TTY_CMD_READ_BUFFER = 3,
28 };
29
30 struct tty_state {
31 struct goldfish_device dev;
32 CharDriverState *cs;
33 uint32_t ptr;
34 uint32_t ptr_len;
35 uint32_t ready;
36 uint8_t data[128];
37 uint32_t data_count;
38 };
39
40 #define GOLDFISH_TTY_SAVE_VERSION 1
41
goldfish_tty_save(QEMUFile * f,void * opaque)42 static void goldfish_tty_save(QEMUFile* f, void* opaque)
43 {
44 struct tty_state* s = opaque;
45
46 qemu_put_be32( f, s->ptr );
47 qemu_put_be32( f, s->ptr_len );
48 qemu_put_byte( f, s->ready );
49 qemu_put_byte( f, s->data_count );
50 qemu_put_buffer( f, s->data, s->data_count );
51 }
52
goldfish_tty_load(QEMUFile * f,void * opaque,int version_id)53 static int goldfish_tty_load(QEMUFile* f, void* opaque, int version_id)
54 {
55 struct tty_state* s = opaque;
56
57 if (version_id != GOLDFISH_TTY_SAVE_VERSION)
58 return -1;
59
60 s->ptr = qemu_get_be32(f);
61 s->ptr_len = qemu_get_be32(f);
62 s->ready = qemu_get_byte(f);
63 s->data_count = qemu_get_byte(f);
64 qemu_get_buffer(f, s->data, s->data_count);
65
66 return 0;
67 }
68
goldfish_tty_read(void * opaque,target_phys_addr_t offset)69 static uint32_t goldfish_tty_read(void *opaque, target_phys_addr_t offset)
70 {
71 struct tty_state *s = (struct tty_state *)opaque;
72
73 //printf("goldfish_tty_read %x %x\n", offset, size);
74
75 switch (offset) {
76 case TTY_BYTES_READY:
77 return s->data_count;
78 default:
79 cpu_abort (cpu_single_env, "goldfish_tty_read: Bad offset %x\n", offset);
80 return 0;
81 }
82 }
83
goldfish_tty_write(void * opaque,target_phys_addr_t offset,uint32_t value)84 static void goldfish_tty_write(void *opaque, target_phys_addr_t offset, uint32_t value)
85 {
86 struct tty_state *s = (struct tty_state *)opaque;
87
88 //printf("goldfish_tty_read %x %x %x\n", offset, value, size);
89
90 switch(offset) {
91 case TTY_PUT_CHAR: {
92 uint8_t ch = value;
93 if(s->cs)
94 qemu_chr_write(s->cs, &ch, 1);
95 } break;
96
97 case TTY_CMD:
98 switch(value) {
99 case TTY_CMD_INT_DISABLE:
100 if(s->ready) {
101 if(s->data_count > 0)
102 goldfish_device_set_irq(&s->dev, 0, 0);
103 s->ready = 0;
104 }
105 break;
106
107 case TTY_CMD_INT_ENABLE:
108 if(!s->ready) {
109 if(s->data_count > 0)
110 goldfish_device_set_irq(&s->dev, 0, 1);
111 s->ready = 1;
112 }
113 break;
114
115 case TTY_CMD_WRITE_BUFFER:
116 if(s->cs) {
117 int len;
118 target_phys_addr_t buf;
119
120 buf = s->ptr;
121 len = s->ptr_len;
122
123 while (len) {
124 char temp[64];
125 int to_write = sizeof(temp);
126 if (to_write > len)
127 to_write = len;
128
129 cpu_memory_rw_debug(cpu_single_env, buf, temp, to_write, 0);
130 qemu_chr_write(s->cs, temp, to_write);
131 buf += to_write;
132 len -= to_write;
133 }
134 //printf("goldfish_tty_write: got %d bytes from %x\n", s->ptr_len, s->ptr);
135 }
136 break;
137
138 case TTY_CMD_READ_BUFFER:
139 if(s->ptr_len > s->data_count)
140 cpu_abort (cpu_single_env, "goldfish_tty_write: reading more data than available %d %d\n", s->ptr_len, s->data_count);
141 cpu_memory_rw_debug(cpu_single_env,s->ptr, s->data, s->ptr_len,1);
142 //printf("goldfish_tty_write: read %d bytes to %x\n", s->ptr_len, s->ptr);
143 if(s->data_count > s->ptr_len)
144 memmove(s->data, s->data + s->ptr_len, s->data_count - s->ptr_len);
145 s->data_count -= s->ptr_len;
146 if(s->data_count == 0 && s->ready)
147 goldfish_device_set_irq(&s->dev, 0, 0);
148 break;
149
150 default:
151 cpu_abort (cpu_single_env, "goldfish_tty_write: Bad command %x\n", value);
152 };
153 break;
154
155 case TTY_DATA_PTR:
156 s->ptr = value;
157 break;
158
159 case TTY_DATA_LEN:
160 s->ptr_len = value;
161 break;
162
163 default:
164 cpu_abort (cpu_single_env, "goldfish_tty_write: Bad offset %x\n", offset);
165 }
166 }
167
tty_can_receive(void * opaque)168 static int tty_can_receive(void *opaque)
169 {
170 struct tty_state *s = opaque;
171
172 return (sizeof(s->data) - s->data_count);
173 }
174
tty_receive(void * opaque,const uint8_t * buf,int size)175 static void tty_receive(void *opaque, const uint8_t *buf, int size)
176 {
177 struct tty_state *s = opaque;
178
179 memcpy(s->data + s->data_count, buf, size);
180 s->data_count += size;
181 if(s->data_count > 0 && s->ready)
182 goldfish_device_set_irq(&s->dev, 0, 1);
183 }
184
185 static CPUReadMemoryFunc *goldfish_tty_readfn[] = {
186 goldfish_tty_read,
187 goldfish_tty_read,
188 goldfish_tty_read
189 };
190
191 static CPUWriteMemoryFunc *goldfish_tty_writefn[] = {
192 goldfish_tty_write,
193 goldfish_tty_write,
194 goldfish_tty_write
195 };
196
goldfish_tty_add(CharDriverState * cs,int id,uint32_t base,int irq)197 int goldfish_tty_add(CharDriverState *cs, int id, uint32_t base, int irq)
198 {
199 int ret;
200 struct tty_state *s;
201 static int instance_id = 0;
202
203 s = qemu_mallocz(sizeof(*s));
204 s->dev.name = "goldfish_tty";
205 s->dev.id = id;
206 s->dev.base = base;
207 s->dev.size = 0x1000;
208 s->dev.irq = irq;
209 s->dev.irq_count = 1;
210 s->cs = cs;
211
212 if(cs) {
213 qemu_chr_add_handlers(cs, tty_can_receive, tty_receive, NULL, s);
214 }
215
216 ret = goldfish_device_add(&s->dev, goldfish_tty_readfn, goldfish_tty_writefn, s);
217 if(ret) {
218 qemu_free(s);
219 } else {
220 register_savevm( "goldfish_tty", instance_id++, GOLDFISH_TTY_SAVE_VERSION,
221 goldfish_tty_save, goldfish_tty_load, s);
222 }
223 return ret;
224 }
225
226