2 * QEMU NVRAM emulation for DS1225Y chip
4 * Copyright (c) 2007-2008 Hervé Poussineau
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:
13 * The above copyright notice and this permission notice shall be included in
14 * all copies or substantial portions of the Software.
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
25 #include "hw/sysbus.h"
36 static uint64_t nvram_read(void *opaque, hwaddr addr, unsigned size)
38 NvRamState *s = opaque;
41 val = s->contents[addr];
42 trace_nvram_read(addr, val);
46 static void nvram_write(void *opaque, hwaddr addr, uint64_t val,
49 NvRamState *s = opaque;
52 trace_nvram_write(addr, s->contents[addr], val);
54 s->contents[addr] = val;
56 fseek(s->file, addr, SEEK_SET);
62 static const MemoryRegionOps nvram_ops = {
69 .endianness = DEVICE_LITTLE_ENDIAN,
72 static int nvram_post_load(void *opaque, int version_id)
74 NvRamState *s = opaque;
76 /* Close file, as filename may has changed in load/store process */
81 /* Write back nvram contents */
82 s->file = fopen(s->filename, "wb");
84 /* Write back contents, as 'wb' mode cleaned the file */
85 if (fwrite(s->contents, s->chip_size, 1, s->file) != 1) {
86 printf("nvram_post_load: short write\n");
94 static const VMStateDescription vmstate_nvram = {
97 .minimum_version_id = 0,
98 .post_load = nvram_post_load,
99 .fields = (VMStateField[]) {
100 VMSTATE_VARRAY_UINT32(contents, NvRamState, chip_size, 0,
101 vmstate_info_uint8, uint8_t),
102 VMSTATE_END_OF_LIST()
106 #define TYPE_DS1225Y "ds1225y"
107 #define DS1225Y(obj) OBJECT_CHECK(SysBusNvRamState, (obj), TYPE_DS1225Y)
110 SysBusDevice parent_obj;
115 static int nvram_sysbus_initfn(SysBusDevice *dev)
117 SysBusNvRamState *sys = DS1225Y(dev);
118 NvRamState *s = &sys->nvram;
121 s->contents = g_malloc0(s->chip_size);
123 memory_region_init_io(&s->iomem, OBJECT(s), &nvram_ops, s,
124 "nvram", s->chip_size);
125 sysbus_init_mmio(dev, &s->iomem);
127 /* Read current file */
128 file = fopen(s->filename, "rb");
130 /* Read nvram contents */
131 if (fread(s->contents, s->chip_size, 1, file) != 1) {
132 printf("nvram_sysbus_initfn: short read\n");
136 nvram_post_load(s, 0);
141 static Property nvram_sysbus_properties[] = {
142 DEFINE_PROP_UINT32("size", SysBusNvRamState, nvram.chip_size, 0x2000),
143 DEFINE_PROP_STRING("filename", SysBusNvRamState, nvram.filename),
144 DEFINE_PROP_END_OF_LIST(),
147 static void nvram_sysbus_class_init(ObjectClass *klass, void *data)
149 DeviceClass *dc = DEVICE_CLASS(klass);
150 SysBusDeviceClass *k = SYS_BUS_DEVICE_CLASS(klass);
152 k->init = nvram_sysbus_initfn;
153 dc->vmsd = &vmstate_nvram;
154 dc->props = nvram_sysbus_properties;
157 static const TypeInfo nvram_sysbus_info = {
158 .name = TYPE_DS1225Y,
159 .parent = TYPE_SYS_BUS_DEVICE,
160 .instance_size = sizeof(SysBusNvRamState),
161 .class_init = nvram_sysbus_class_init,
164 static void nvram_register_types(void)
166 type_register_static(&nvram_sysbus_info);
169 type_init(nvram_register_types)