2 * QEMU NVRAM emulation for DS1225Y chip
4 * Copyright (c) 2007 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
38 target_phys_addr_t mem_base
;
42 nvram_open_mode open_mode
;
45 static int ds1225y_set_to_mode(ds1225y_t
*NVRAM
, nvram_open_mode mode
, const char *filemode
)
47 if (NVRAM
->open_mode
!= mode
)
50 qemu_fclose(NVRAM
->file
);
51 NVRAM
->file
= qemu_fopen(NVRAM
->filename
, filemode
);
52 NVRAM
->open_mode
= mode
;
54 return (NVRAM
->file
!= NULL
);
57 static uint32_t nvram_readb (void *opaque
, target_phys_addr_t addr
)
59 ds1225y_t
*NVRAM
= opaque
;
62 pos
= addr
- NVRAM
->mem_base
;
63 if (addr
>= NVRAM
->capacity
)
64 addr
-= NVRAM
->capacity
;
66 if (!ds1225y_set_to_mode(NVRAM
, readmode
, "rb"))
68 qemu_fseek(NVRAM
->file
, pos
, SEEK_SET
);
69 return (uint32_t)qemu_get_byte(NVRAM
->file
);
72 static void nvram_writeb (void *opaque
, target_phys_addr_t addr
, uint32_t value
)
74 ds1225y_t
*NVRAM
= opaque
;
77 pos
= addr
- NVRAM
->mem_base
;
78 if (ds1225y_set_to_mode(NVRAM
, writemode
, "wb"))
80 qemu_fseek(NVRAM
->file
, pos
, SEEK_SET
);
81 qemu_put_byte(NVRAM
->file
, (int)value
);
85 static CPUReadMemoryFunc
*nvram_read
[] = {
91 static CPUWriteMemoryFunc
*nvram_write
[] = {
97 static CPUWriteMemoryFunc
*nvram_none
[] = {
103 /* Initialisation routine */
104 ds1225y_t
*ds1225y_init(target_phys_addr_t mem_base
, const char *filename
)
107 int mem_index1
, mem_index2
;
109 s
= qemu_mallocz(sizeof(ds1225y_t
));
112 s
->mem_base
= mem_base
;
113 s
->capacity
= 0x2000; /* Fixed for ds1225y chip: 8K */
114 s
->filename
= filename
;
116 /* Read/write memory */
117 mem_index1
= cpu_register_io_memory(0, nvram_read
, nvram_write
, s
);
118 cpu_register_physical_memory(mem_base
, s
->capacity
, mem_index1
);
119 /* Read-only memory */
120 mem_index2
= cpu_register_io_memory(0, nvram_read
, nvram_none
, s
);
121 cpu_register_physical_memory(mem_base
+ s
->capacity
, s
->capacity
, mem_index2
);