2 * QEMU NVRAM emulation for DS1225Y chip
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4 * Copyright (c) 2007 Hervé Poussineau
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6 * Permission is hereby granted, free of charge, to any person obtaining a copy
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7 * of this software and associated documentation files (the "Software"), to deal
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8 * in the Software without restriction, including without limitation the rights
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9 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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10 * copies of the Software, and to permit persons to whom the Software is
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11 * furnished to do so, subject to the following conditions:
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13 * The above copyright notice and this permission notice shall be included in
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14 * all copies or substantial portions of the Software.
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16 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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17 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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18 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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19 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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20 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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21 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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36 target_ulong mem_base;
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38 const char *filename;
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40 nvram_open_mode open_mode;
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43 static int ds1225y_set_to_mode(ds1225y_t *NVRAM, nvram_open_mode mode, const char *filemode)
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45 if (NVRAM->open_mode != mode)
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48 qemu_fclose(NVRAM->file);
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49 NVRAM->file = qemu_fopen(NVRAM->filename, filemode);
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50 NVRAM->open_mode = mode;
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52 return (NVRAM->file != NULL);
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55 static uint32_t nvram_readb (void *opaque, target_phys_addr_t addr)
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57 ds1225y_t *NVRAM = opaque;
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60 pos = addr - NVRAM->mem_base;
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61 if (addr >= NVRAM->capacity)
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62 addr -= NVRAM->capacity;
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64 if (!ds1225y_set_to_mode(NVRAM, readmode, "rb"))
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66 qemu_fseek(NVRAM->file, pos, SEEK_SET);
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67 return (uint32_t)qemu_get_byte(NVRAM->file);
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70 static void nvram_writeb (void *opaque, target_phys_addr_t addr, uint32_t value)
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72 ds1225y_t *NVRAM = opaque;
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75 pos = addr - NVRAM->mem_base;
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76 if (ds1225y_set_to_mode(NVRAM, writemode, "wb"))
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78 qemu_fseek(NVRAM->file, pos, SEEK_SET);
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79 qemu_put_byte(NVRAM->file, (int)value);
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83 static CPUReadMemoryFunc *nvram_read[] = {
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89 static CPUWriteMemoryFunc *nvram_write[] = {
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95 static CPUWriteMemoryFunc *nvram_none[] = {
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101 /* Initialisation routine */
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102 ds1225y_t *ds1225y_init(target_ulong mem_base, const char *filename)
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105 int mem_index1, mem_index2;
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107 s = qemu_mallocz(sizeof(ds1225y_t));
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110 s->mem_base = mem_base;
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111 s->capacity = 0x2000; /* Fixed for ds1225y chip: 8K */
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112 s->filename = filename;
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114 /* Read/write memory */
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115 mem_index1 = cpu_register_io_memory(0, nvram_read, nvram_write, s);
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116 cpu_register_physical_memory(mem_base, s->capacity, mem_index1);
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117 /* Read-only memory */
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118 mem_index2 = cpu_register_io_memory(0, nvram_read, nvram_none, s);
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119 cpu_register_physical_memory(mem_base + s->capacity, s->capacity, mem_index2);
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