2
* QEMU NVRAM emulation for DS1225Y chip
4
* Copyright (c) 2007 Herv� 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
36
target_phys_addr_t mem_base;
40
nvram_open_mode open_mode;
43
static int ds1225y_set_to_mode(ds1225y_t *NVRAM, nvram_open_mode mode, const char *filemode)
45
if (NVRAM->open_mode != mode)
48
qemu_fclose(NVRAM->file);
49
NVRAM->file = qemu_fopen(NVRAM->filename, filemode);
50
NVRAM->open_mode = mode;
52
return (NVRAM->file != NULL);
55
static uint32_t nvram_readb (void *opaque, target_phys_addr_t addr)
57
ds1225y_t *NVRAM = opaque;
60
pos = addr - NVRAM->mem_base;
61
if (addr >= NVRAM->capacity)
62
addr -= NVRAM->capacity;
64
if (!ds1225y_set_to_mode(NVRAM, readmode, "rb"))
66
qemu_fseek(NVRAM->file, pos, SEEK_SET);
67
return (uint32_t)qemu_get_byte(NVRAM->file);
70
static void nvram_writeb (void *opaque, target_phys_addr_t addr, uint32_t value)
72
ds1225y_t *NVRAM = opaque;
75
pos = addr - NVRAM->mem_base;
76
if (ds1225y_set_to_mode(NVRAM, writemode, "wb"))
78
qemu_fseek(NVRAM->file, pos, SEEK_SET);
79
qemu_put_byte(NVRAM->file, (int)value);
83
static CPUReadMemoryFunc *nvram_read[] = {
89
static CPUWriteMemoryFunc *nvram_write[] = {
95
static CPUWriteMemoryFunc *nvram_none[] = {
101
/* Initialisation routine */
102
ds1225y_t *ds1225y_init(target_phys_addr_t mem_base, const char *filename)
105
int mem_index1, mem_index2;
107
s = qemu_mallocz(sizeof(ds1225y_t));
110
s->mem_base = mem_base;
111
s->capacity = 0x2000; /* Fixed for ds1225y chip: 8K */
112
s->filename = filename;
114
/* Read/write memory */
115
mem_index1 = cpu_register_io_memory(0, nvram_read, nvram_write, s);
116
cpu_register_physical_memory(mem_base, s->capacity, mem_index1);
117
/* Read-only memory */
118
mem_index2 = cpu_register_io_memory(0, nvram_read, nvram_none, s);
119
cpu_register_physical_memory(mem_base + s->capacity, s->capacity, mem_index2);