root / hw / ds1225y.c @ 4118a970
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1 | 9542611a | ths | /*
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2 | 9542611a | ths | * QEMU NVRAM emulation for DS1225Y chip
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3 | 9542611a | ths | *
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4 | 9542611a | ths | * Copyright (c) 2007 Herv? Poussineau
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5 | 9542611a | ths | *
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6 | 9542611a | ths | * Permission is hereby granted, free of charge, to any person obtaining a copy
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7 | 9542611a | ths | * of this software and associated documentation files (the "Software"), to deal
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8 | 9542611a | ths | * in the Software without restriction, including without limitation the rights
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9 | 9542611a | ths | * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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10 | 9542611a | ths | * copies of the Software, and to permit persons to whom the Software is
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11 | 9542611a | ths | * furnished to do so, subject to the following conditions:
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12 | 9542611a | ths | *
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13 | 9542611a | ths | * The above copyright notice and this permission notice shall be included in
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14 | 9542611a | ths | * all copies or substantial portions of the Software.
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15 | 9542611a | ths | *
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16 | 9542611a | ths | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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17 | 9542611a | ths | * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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18 | 9542611a | ths | * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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19 | 9542611a | ths | * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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20 | 9542611a | ths | * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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21 | 9542611a | ths | * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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22 | 9542611a | ths | * THE SOFTWARE.
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23 | 9542611a | ths | */
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24 | 9542611a | ths | |
25 | 9542611a | ths | #include "vl.h" |
26 | 9542611a | ths | |
27 | 9542611a | ths | typedef enum |
28 | 9542611a | ths | { |
29 | 9542611a | ths | none = 0,
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30 | 9542611a | ths | readmode, |
31 | 9542611a | ths | writemode, |
32 | 9542611a | ths | } nvram_open_mode; |
33 | 9542611a | ths | |
34 | 9542611a | ths | struct ds1225y_t
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35 | 9542611a | ths | { |
36 | 71db710f | blueswir1 | target_phys_addr_t mem_base; |
37 | 9542611a | ths | uint32_t capacity; |
38 | 9542611a | ths | const char *filename; |
39 | 9542611a | ths | QEMUFile *file; |
40 | 9542611a | ths | nvram_open_mode open_mode; |
41 | 9542611a | ths | }; |
42 | 9542611a | ths | |
43 | 9542611a | ths | static int ds1225y_set_to_mode(ds1225y_t *NVRAM, nvram_open_mode mode, const char *filemode) |
44 | 9542611a | ths | { |
45 | 9542611a | ths | if (NVRAM->open_mode != mode)
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46 | 9542611a | ths | { |
47 | 9542611a | ths | if (NVRAM->file)
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48 | 9542611a | ths | qemu_fclose(NVRAM->file); |
49 | 9542611a | ths | NVRAM->file = qemu_fopen(NVRAM->filename, filemode); |
50 | 9542611a | ths | NVRAM->open_mode = mode; |
51 | 9542611a | ths | } |
52 | 9542611a | ths | return (NVRAM->file != NULL); |
53 | 9542611a | ths | } |
54 | 9542611a | ths | |
55 | 9542611a | ths | static uint32_t nvram_readb (void *opaque, target_phys_addr_t addr) |
56 | 9542611a | ths | { |
57 | 9542611a | ths | ds1225y_t *NVRAM = opaque; |
58 | 9542611a | ths | int64_t pos; |
59 | 9542611a | ths | |
60 | 9542611a | ths | pos = addr - NVRAM->mem_base; |
61 | 9542611a | ths | if (addr >= NVRAM->capacity)
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62 | 9542611a | ths | addr -= NVRAM->capacity; |
63 | 9542611a | ths | |
64 | 9542611a | ths | if (!ds1225y_set_to_mode(NVRAM, readmode, "rb")) |
65 | 9542611a | ths | return 0; |
66 | 9542611a | ths | qemu_fseek(NVRAM->file, pos, SEEK_SET); |
67 | 9542611a | ths | return (uint32_t)qemu_get_byte(NVRAM->file);
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68 | 9542611a | ths | } |
69 | 9542611a | ths | |
70 | 9542611a | ths | static void nvram_writeb (void *opaque, target_phys_addr_t addr, uint32_t value) |
71 | 9542611a | ths | { |
72 | 9542611a | ths | ds1225y_t *NVRAM = opaque; |
73 | 9542611a | ths | int64_t pos; |
74 | 9542611a | ths | |
75 | 9542611a | ths | pos = addr - NVRAM->mem_base; |
76 | 9542611a | ths | if (ds1225y_set_to_mode(NVRAM, writemode, "wb")) |
77 | 9542611a | ths | { |
78 | 9542611a | ths | qemu_fseek(NVRAM->file, pos, SEEK_SET); |
79 | 9542611a | ths | qemu_put_byte(NVRAM->file, (int)value);
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80 | 9542611a | ths | } |
81 | 9542611a | ths | } |
82 | 9542611a | ths | |
83 | 9542611a | ths | static CPUReadMemoryFunc *nvram_read[] = {
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84 | 9542611a | ths | &nvram_readb, |
85 | 9542611a | ths | NULL,
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86 | 9542611a | ths | NULL,
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87 | 9542611a | ths | }; |
88 | 9542611a | ths | |
89 | 9542611a | ths | static CPUWriteMemoryFunc *nvram_write[] = {
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90 | 9542611a | ths | &nvram_writeb, |
91 | 9542611a | ths | NULL,
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92 | 9542611a | ths | NULL,
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93 | 9542611a | ths | }; |
94 | 9542611a | ths | |
95 | 9542611a | ths | static CPUWriteMemoryFunc *nvram_none[] = {
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96 | 9542611a | ths | NULL,
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97 | 9542611a | ths | NULL,
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98 | 9542611a | ths | NULL,
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99 | 9542611a | ths | }; |
100 | 9542611a | ths | |
101 | 9542611a | ths | /* Initialisation routine */
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102 | 71db710f | blueswir1 | ds1225y_t *ds1225y_init(target_phys_addr_t mem_base, const char *filename) |
103 | 9542611a | ths | { |
104 | 9542611a | ths | ds1225y_t *s; |
105 | 9542611a | ths | int mem_index1, mem_index2;
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106 | 9542611a | ths | |
107 | 9542611a | ths | s = qemu_mallocz(sizeof(ds1225y_t));
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108 | 9542611a | ths | if (!s)
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109 | 9542611a | ths | return NULL; |
110 | 9542611a | ths | s->mem_base = mem_base; |
111 | 9542611a | ths | s->capacity = 0x2000; /* Fixed for ds1225y chip: 8K */ |
112 | 9542611a | ths | s->filename = filename; |
113 | 9542611a | ths | |
114 | 9542611a | ths | /* Read/write memory */
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115 | 9542611a | ths | mem_index1 = cpu_register_io_memory(0, nvram_read, nvram_write, s);
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116 | 9542611a | ths | cpu_register_physical_memory(mem_base, s->capacity, mem_index1); |
117 | 9542611a | ths | /* Read-only memory */
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118 | 9542611a | ths | mem_index2 = cpu_register_io_memory(0, nvram_read, nvram_none, s);
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119 | 9542611a | ths | cpu_register_physical_memory(mem_base + s->capacity, s->capacity, mem_index2); |
120 | 9542611a | ths | return s;
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121 | 9542611a | ths | } |