sm501: Add missing arbitration control register
[qemu.git] / hw / nvram / ds1225y.c
1 /*
2 * QEMU NVRAM emulation for DS1225Y chip
3 *
4 * Copyright (c) 2007-2008 Hervé Poussineau
5 *
6 * Permission is hereby granted, free of charge, to any person obtaining a copy
7 * of this software and associated documentation files (the "Software"), to deal
8 * in the Software without restriction, including without limitation the rights
9 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
10 * copies of the Software, and to permit persons to whom the Software is
11 * furnished to do so, subject to the following conditions:
12 *
13 * The above copyright notice and this permission notice shall be included in
14 * all copies or substantial portions of the Software.
15 *
16 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
17 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
18 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
19 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
20 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
21 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
22 * THE SOFTWARE.
23 */
24
25 #include "qemu/osdep.h"
26 #include "hw/sysbus.h"
27 #include "trace.h"
28
29 typedef struct {
30 MemoryRegion iomem;
31 uint32_t chip_size;
32 char *filename;
33 FILE *file;
34 uint8_t *contents;
35 } NvRamState;
36
37 static uint64_t nvram_read(void *opaque, hwaddr addr, unsigned size)
38 {
39 NvRamState *s = opaque;
40 uint32_t val;
41
42 val = s->contents[addr];
43 trace_nvram_read(addr, val);
44 return val;
45 }
46
47 static void nvram_write(void *opaque, hwaddr addr, uint64_t val,
48 unsigned size)
49 {
50 NvRamState *s = opaque;
51
52 val &= 0xff;
53 trace_nvram_write(addr, s->contents[addr], val);
54
55 s->contents[addr] = val;
56 if (s->file) {
57 fseek(s->file, addr, SEEK_SET);
58 fputc(val, s->file);
59 fflush(s->file);
60 }
61 }
62
63 static const MemoryRegionOps nvram_ops = {
64 .read = nvram_read,
65 .write = nvram_write,
66 .impl = {
67 .min_access_size = 1,
68 .max_access_size = 1,
69 },
70 .endianness = DEVICE_LITTLE_ENDIAN,
71 };
72
73 static int nvram_post_load(void *opaque, int version_id)
74 {
75 NvRamState *s = opaque;
76
77 /* Close file, as filename may has changed in load/store process */
78 if (s->file) {
79 fclose(s->file);
80 }
81
82 /* Write back nvram contents */
83 s->file = fopen(s->filename, "wb");
84 if (s->file) {
85 /* Write back contents, as 'wb' mode cleaned the file */
86 if (fwrite(s->contents, s->chip_size, 1, s->file) != 1) {
87 printf("nvram_post_load: short write\n");
88 }
89 fflush(s->file);
90 }
91
92 return 0;
93 }
94
95 static const VMStateDescription vmstate_nvram = {
96 .name = "nvram",
97 .version_id = 0,
98 .minimum_version_id = 0,
99 .post_load = nvram_post_load,
100 .fields = (VMStateField[]) {
101 VMSTATE_VARRAY_UINT32(contents, NvRamState, chip_size, 0,
102 vmstate_info_uint8, uint8_t),
103 VMSTATE_END_OF_LIST()
104 }
105 };
106
107 #define TYPE_DS1225Y "ds1225y"
108 #define DS1225Y(obj) OBJECT_CHECK(SysBusNvRamState, (obj), TYPE_DS1225Y)
109
110 typedef struct {
111 SysBusDevice parent_obj;
112
113 NvRamState nvram;
114 } SysBusNvRamState;
115
116 static int nvram_sysbus_initfn(SysBusDevice *dev)
117 {
118 SysBusNvRamState *sys = DS1225Y(dev);
119 NvRamState *s = &sys->nvram;
120 FILE *file;
121
122 s->contents = g_malloc0(s->chip_size);
123
124 memory_region_init_io(&s->iomem, OBJECT(s), &nvram_ops, s,
125 "nvram", s->chip_size);
126 sysbus_init_mmio(dev, &s->iomem);
127
128 /* Read current file */
129 file = fopen(s->filename, "rb");
130 if (file) {
131 /* Read nvram contents */
132 if (fread(s->contents, s->chip_size, 1, file) != 1) {
133 printf("nvram_sysbus_initfn: short read\n");
134 }
135 fclose(file);
136 }
137 nvram_post_load(s, 0);
138
139 return 0;
140 }
141
142 static Property nvram_sysbus_properties[] = {
143 DEFINE_PROP_UINT32("size", SysBusNvRamState, nvram.chip_size, 0x2000),
144 DEFINE_PROP_STRING("filename", SysBusNvRamState, nvram.filename),
145 DEFINE_PROP_END_OF_LIST(),
146 };
147
148 static void nvram_sysbus_class_init(ObjectClass *klass, void *data)
149 {
150 DeviceClass *dc = DEVICE_CLASS(klass);
151 SysBusDeviceClass *k = SYS_BUS_DEVICE_CLASS(klass);
152
153 k->init = nvram_sysbus_initfn;
154 dc->vmsd = &vmstate_nvram;
155 dc->props = nvram_sysbus_properties;
156 }
157
158 static const TypeInfo nvram_sysbus_info = {
159 .name = TYPE_DS1225Y,
160 .parent = TYPE_SYS_BUS_DEVICE,
161 .instance_size = sizeof(SysBusNvRamState),
162 .class_init = nvram_sysbus_class_init,
163 };
164
165 static void nvram_register_types(void)
166 {
167 type_register_static(&nvram_sysbus_info);
168 }
169
170 type_init(nvram_register_types)