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/*
* QEMU NVRAM emulation for DS1225Y chip
*
* Copyright (c) 2007-2008 Hervé Poussineau
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
*/
#include "sysbus.h"
#include "trace.h"
typedef struct {
DeviceState qdev;
MemoryRegion iomem;
uint32_t chip_size;
char *filename;
FILE *file;
uint8_t *contents;
} NvRamState;
static uint64_t nvram_read(void *opaque, target_phys_addr_t addr, unsigned size)
{
NvRamState *s = opaque;
uint32_t val;
val = s->contents[addr];
trace_nvram_read(addr, val);
return val;
}
static void nvram_write(void *opaque, target_phys_addr_t addr, uint64_t val,
unsigned size)
{
NvRamState *s = opaque;
val &= 0xff;
trace_nvram_write(addr, s->contents[addr], val);
s->contents[addr] = val;
if (s->file) {
fseek(s->file, addr, SEEK_SET);
fputc(val, s->file);
fflush(s->file);
}
}
static const MemoryRegionOps nvram_ops = {
.read = nvram_read,
.write = nvram_write,
.impl = {
.min_access_size = 1,
.max_access_size = 1,
},
.endianness = DEVICE_LITTLE_ENDIAN,
};
static int nvram_post_load(void *opaque, int version_id)
{
NvRamState *s = opaque;
/* Close file, as filename may has changed in load/store process */
if (s->file) {
fclose(s->file);
}
/* Write back nvram contents */
s->file = fopen(s->filename, "wb");
if (s->file) {
/* Write back contents, as 'wb' mode cleaned the file */
if (fwrite(s->contents, s->chip_size, 1, s->file) != 1) {
printf("nvram_post_load: short write\n");
}
fflush(s->file);
}
return 0;
}
static const VMStateDescription vmstate_nvram = {
.name = "nvram",
.version_id = 0,
.minimum_version_id = 0,
.minimum_version_id_old = 0,
.post_load = nvram_post_load,
.fields = (VMStateField[]) {
VMSTATE_VARRAY_UINT32(contents, NvRamState, chip_size, 0,
vmstate_info_uint8, uint8_t),
VMSTATE_END_OF_LIST()
}
};
typedef struct {
SysBusDevice busdev;
NvRamState nvram;
} SysBusNvRamState;
static int nvram_sysbus_initfn(SysBusDevice *dev)
{
NvRamState *s = &FROM_SYSBUS(SysBusNvRamState, dev)->nvram;
FILE *file;
s->contents = g_malloc0(s->chip_size);
memory_region_init_io(&s->iomem, &nvram_ops, s, "nvram", s->chip_size);
sysbus_init_mmio(dev, &s->iomem);
/* Read current file */
file = fopen(s->filename, "rb");
if (file) {
/* Read nvram contents */
if (fread(s->contents, s->chip_size, 1, file) != 1) {
printf("nvram_sysbus_initfn: short read\n");
}
fclose(file);
}
nvram_post_load(s, 0);
return 0;
}
static SysBusDeviceInfo nvram_sysbus_info = {
.qdev.name = "ds1225y",
.qdev.size = sizeof(SysBusNvRamState),
.qdev.vmsd = &vmstate_nvram,
.init = nvram_sysbus_initfn,
.qdev.props = (Property[]) {
DEFINE_PROP_UINT32("size", SysBusNvRamState, nvram.chip_size, 0x2000),
DEFINE_PROP_STRING("filename", SysBusNvRamState, nvram.filename),
DEFINE_PROP_END_OF_LIST(),
},
};
static void nvram_register(void)
{
sysbus_register_withprop(&nvram_sysbus_info);
}
device_init(nvram_register)
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