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| author | ths <ths@c046a42c-6fe2-441c-8c8c-71466251a162> | 2007-02-28 21:36:41 +0000 |
|---|---|---|
| committer | ths <ths@c046a42c-6fe2-441c-8c8c-71466251a162> | 2007-02-28 21:36:41 +0000 |
| commit | 9542611a66227ceca062eec86d49e17aa79cbf90 (patch) | |
| tree | f0e10f06ad4b7b15987d54e10184b287ffe5ce1a /hw/ds1225y.c | |
| parent | c5be9f0898b92d0d6bfb458fd50fc170f4300361 (diff) | |
| download | focaccia-qemu-9542611a66227ceca062eec86d49e17aa79cbf90.tar.gz focaccia-qemu-9542611a66227ceca062eec86d49e17aa79cbf90.zip | |
DS1225Y nvram device, by Herve Poussineau.
git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@2460 c046a42c-6fe2-441c-8c8c-71466251a162
Diffstat (limited to 'hw/ds1225y.c')
| -rw-r--r-- | hw/ds1225y.c | 121 |
1 files changed, 121 insertions, 0 deletions
diff --git a/hw/ds1225y.c b/hw/ds1225y.c new file mode 100644 index 0000000000..48d6636b3c --- /dev/null +++ b/hw/ds1225y.c @@ -0,0 +1,121 @@ +/* + * QEMU NVRAM emulation for DS1225Y chip + * + * Copyright (c) 2007 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 "vl.h" + +typedef enum +{ + none = 0, + readmode, + writemode, +} nvram_open_mode; + +struct ds1225y_t +{ + target_ulong mem_base; + uint32_t capacity; + const char *filename; + QEMUFile *file; + nvram_open_mode open_mode; +}; + +static int ds1225y_set_to_mode(ds1225y_t *NVRAM, nvram_open_mode mode, const char *filemode) +{ + if (NVRAM->open_mode != mode) + { + if (NVRAM->file) + qemu_fclose(NVRAM->file); + NVRAM->file = qemu_fopen(NVRAM->filename, filemode); + NVRAM->open_mode = mode; + } + return (NVRAM->file != NULL); +} + +static uint32_t nvram_readb (void *opaque, target_phys_addr_t addr) +{ + ds1225y_t *NVRAM = opaque; + int64_t pos; + + pos = addr - NVRAM->mem_base; + if (addr >= NVRAM->capacity) + addr -= NVRAM->capacity; + + if (!ds1225y_set_to_mode(NVRAM, readmode, "rb")) + return 0; + qemu_fseek(NVRAM->file, pos, SEEK_SET); + return (uint32_t)qemu_get_byte(NVRAM->file); +} + +static void nvram_writeb (void *opaque, target_phys_addr_t addr, uint32_t value) +{ + ds1225y_t *NVRAM = opaque; + int64_t pos; + + pos = addr - NVRAM->mem_base; + if (ds1225y_set_to_mode(NVRAM, writemode, "wb")) + { + qemu_fseek(NVRAM->file, pos, SEEK_SET); + qemu_put_byte(NVRAM->file, (int)value); + } +} + +static CPUReadMemoryFunc *nvram_read[] = { + &nvram_readb, + NULL, + NULL, +}; + +static CPUWriteMemoryFunc *nvram_write[] = { + &nvram_writeb, + NULL, + NULL, +}; + +static CPUWriteMemoryFunc *nvram_none[] = { + NULL, + NULL, + NULL, +}; + +/* Initialisation routine */ +ds1225y_t *ds1225y_init(target_ulong mem_base, const char *filename) +{ + ds1225y_t *s; + int mem_index1, mem_index2; + + s = qemu_mallocz(sizeof(ds1225y_t)); + if (!s) + return NULL; + s->mem_base = mem_base; + s->capacity = 0x2000; /* Fixed for ds1225y chip: 8K */ + s->filename = filename; + + /* Read/write memory */ + mem_index1 = cpu_register_io_memory(0, nvram_read, nvram_write, s); + cpu_register_physical_memory(mem_base, s->capacity, mem_index1); + /* Read-only memory */ + mem_index2 = cpu_register_io_memory(0, nvram_read, nvram_none, s); + cpu_register_physical_memory(mem_base + s->capacity, s->capacity, mem_index2); + return s; +} |