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-rw-r--r--src/hw/nvram/ds1225y.c169
1 files changed, 169 insertions, 0 deletions
diff --git a/src/hw/nvram/ds1225y.c b/src/hw/nvram/ds1225y.c
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+++ b/src/hw/nvram/ds1225y.c
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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 "hw/sysbus.h"
+#include "trace.h"
+
+typedef struct {
+ MemoryRegion iomem;
+ uint32_t chip_size;
+ char *filename;
+ FILE *file;
+ uint8_t *contents;
+} NvRamState;
+
+static uint64_t nvram_read(void *opaque, hwaddr 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, hwaddr 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,
+ .post_load = nvram_post_load,
+ .fields = (VMStateField[]) {
+ VMSTATE_VARRAY_UINT32(contents, NvRamState, chip_size, 0,
+ vmstate_info_uint8, uint8_t),
+ VMSTATE_END_OF_LIST()
+ }
+};
+
+#define TYPE_DS1225Y "ds1225y"
+#define DS1225Y(obj) OBJECT_CHECK(SysBusNvRamState, (obj), TYPE_DS1225Y)
+
+typedef struct {
+ SysBusDevice parent_obj;
+
+ NvRamState nvram;
+} SysBusNvRamState;
+
+static int nvram_sysbus_initfn(SysBusDevice *dev)
+{
+ SysBusNvRamState *sys = DS1225Y(dev);
+ NvRamState *s = &sys->nvram;
+ FILE *file;
+
+ s->contents = g_malloc0(s->chip_size);
+
+ memory_region_init_io(&s->iomem, OBJECT(s), &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 Property nvram_sysbus_properties[] = {
+ DEFINE_PROP_UINT32("size", SysBusNvRamState, nvram.chip_size, 0x2000),
+ DEFINE_PROP_STRING("filename", SysBusNvRamState, nvram.filename),
+ DEFINE_PROP_END_OF_LIST(),
+};
+
+static void nvram_sysbus_class_init(ObjectClass *klass, void *data)
+{
+ DeviceClass *dc = DEVICE_CLASS(klass);
+ SysBusDeviceClass *k = SYS_BUS_DEVICE_CLASS(klass);
+
+ k->init = nvram_sysbus_initfn;
+ dc->vmsd = &vmstate_nvram;
+ dc->props = nvram_sysbus_properties;
+}
+
+static const TypeInfo nvram_sysbus_info = {
+ .name = TYPE_DS1225Y,
+ .parent = TYPE_SYS_BUS_DEVICE,
+ .instance_size = sizeof(SysBusNvRamState),
+ .class_init = nvram_sysbus_class_init,
+};
+
+static void nvram_register_types(void)
+{
+ type_register_static(&nvram_sysbus_info);
+}
+
+type_init(nvram_register_types)
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