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/*
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 * QEMU NVRAM emulation for DS1225Y chip
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 * 
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 * Copyright (c) 2007 Herv? Poussineau
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 * 
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 * Permission is hereby granted, free of charge, to any person obtaining a copy
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 * of this software and associated documentation files (the "Software"), to deal
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 * in the Software without restriction, including without limitation the rights
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 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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 * copies of the Software, and to permit persons to whom the Software is
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 * furnished to do so, subject to the following conditions:
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 *
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 * The above copyright notice and this permission notice shall be included in
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 * all copies or substantial portions of the Software.
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 *
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 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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 * THE SOFTWARE.
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 */
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#include "hw.h"
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#include "mips.h"
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#include "nvram.h"
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typedef enum
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{
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    none = 0,
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    readmode,
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    writemode,
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} nvram_open_mode;
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struct ds1225y_t
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{
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    target_phys_addr_t mem_base;
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    uint32_t capacity;
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    const char *filename;
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    QEMUFile *file;
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    nvram_open_mode open_mode;
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};
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static int ds1225y_set_to_mode(ds1225y_t *NVRAM, nvram_open_mode mode, const char *filemode)
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{
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    if (NVRAM->open_mode != mode)
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    {
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        if (NVRAM->file)
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            qemu_fclose(NVRAM->file);
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        NVRAM->file = qemu_fopen(NVRAM->filename, filemode);
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        NVRAM->open_mode = mode;
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    }
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    return (NVRAM->file != NULL);
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}
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static uint32_t nvram_readb (void *opaque, target_phys_addr_t addr)
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{
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    ds1225y_t *NVRAM = opaque;
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    int64_t pos;
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    pos = addr - NVRAM->mem_base;
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    if (addr >= NVRAM->capacity)
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        addr -= NVRAM->capacity;
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    if (!ds1225y_set_to_mode(NVRAM, readmode, "rb"))
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        return 0;
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    qemu_fseek(NVRAM->file, pos, SEEK_SET);
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    return (uint32_t)qemu_get_byte(NVRAM->file);
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}
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static void nvram_writeb (void *opaque, target_phys_addr_t addr, uint32_t value)
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{
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    ds1225y_t *NVRAM = opaque;
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    int64_t pos;
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    pos = addr - NVRAM->mem_base;
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    if (ds1225y_set_to_mode(NVRAM, writemode, "wb"))
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    {
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        qemu_fseek(NVRAM->file, pos, SEEK_SET);
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        qemu_put_byte(NVRAM->file, (int)value);
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    }
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}
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static CPUReadMemoryFunc *nvram_read[] = {
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    &nvram_readb,
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    NULL,
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    NULL,
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};
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static CPUWriteMemoryFunc *nvram_write[] = {
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    &nvram_writeb,
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    NULL,
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    NULL,
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};
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static CPUWriteMemoryFunc *nvram_none[] = {
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    NULL,
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    NULL,
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    NULL,
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};
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/* Initialisation routine */
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ds1225y_t *ds1225y_init(target_phys_addr_t mem_base, const char *filename)
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{
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    ds1225y_t *s;
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    int mem_index1, mem_index2;
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    s = qemu_mallocz(sizeof(ds1225y_t));
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    if (!s)
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        return NULL;
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    s->mem_base = mem_base;
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    s->capacity = 0x2000; /* Fixed for ds1225y chip: 8K */
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    s->filename = filename;
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    /* Read/write memory */
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    mem_index1 = cpu_register_io_memory(0, nvram_read, nvram_write, s);
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    cpu_register_physical_memory(mem_base, s->capacity, mem_index1);
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    /* Read-only memory */
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    mem_index2 = cpu_register_io_memory(0, nvram_read, nvram_none, s);
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    cpu_register_physical_memory(mem_base + s->capacity, s->capacity, mem_index2);
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    return s;
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}