root / hw / ds1225y.c @ 88738c09
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/*
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* QEMU NVRAM emulation for DS1225Y chip
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*
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* Copyright (c) 2007-2008 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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//#define DEBUG_NVRAM
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typedef struct ds1225y_t |
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{ |
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target_phys_addr_t mem_base; |
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uint32_t chip_size; |
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QEMUFile *file; |
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uint8_t *contents; |
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uint8_t protection; |
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} ds1225y_t; |
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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 *s = opaque; |
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int64_t pos; |
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uint32_t val; |
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pos = addr - s->mem_base; |
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if (pos >= s->chip_size)
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pos -= s->chip_size; |
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val = s->contents[pos]; |
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#ifdef DEBUG_NVRAM
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printf("nvram: read 0x%x at " TARGET_FMT_lx "\n", val, addr); |
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#endif
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return val;
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} |
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static uint32_t nvram_readw (void *opaque, target_phys_addr_t addr) |
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{ |
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uint32_t v; |
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v = nvram_readb(opaque, addr); |
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v |= nvram_readb(opaque, addr + 1) << 8; |
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return v;
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} |
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static uint32_t nvram_readl (void *opaque, target_phys_addr_t addr) |
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{ |
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uint32_t v; |
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v = nvram_readb(opaque, addr); |
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v |= nvram_readb(opaque, addr + 1) << 8; |
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v |= nvram_readb(opaque, addr + 2) << 16; |
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v |= nvram_readb(opaque, addr + 3) << 24; |
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return v;
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} |
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static void nvram_writeb (void *opaque, target_phys_addr_t addr, uint32_t val) |
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{ |
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ds1225y_t *s = opaque; |
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int64_t pos; |
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#ifdef DEBUG_NVRAM
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printf("nvram: write 0x%x at " TARGET_FMT_lx "\n", val, addr); |
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#endif
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pos = addr - s->mem_base; |
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s->contents[pos] = val & 0xff;
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if (s->file) {
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qemu_fseek(s->file, pos, SEEK_SET); |
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qemu_put_byte(s->file, (int)val);
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qemu_fflush(s->file); |
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} |
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} |
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static void nvram_writew (void *opaque, target_phys_addr_t addr, uint32_t val) |
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{ |
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nvram_writeb(opaque, addr, val & 0xff);
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nvram_writeb(opaque, addr + 1, (val >> 8) & 0xff); |
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} |
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static void nvram_writel (void *opaque, target_phys_addr_t addr, uint32_t val) |
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{ |
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nvram_writeb(opaque, addr, val & 0xff);
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nvram_writeb(opaque, addr + 1, (val >> 8) & 0xff); |
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nvram_writeb(opaque, addr + 2, (val >> 16) & 0xff); |
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nvram_writeb(opaque, addr + 3, (val >> 24) & 0xff); |
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} |
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static void nvram_writeb_protected (void *opaque, target_phys_addr_t addr, uint32_t val) |
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{ |
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ds1225y_t *s = opaque; |
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if (s->protection != 7) { |
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#ifdef DEBUG_NVRAM
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printf("nvram: prevent write of 0x%x at " TARGET_FMT_lx "\n", val, addr); |
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#endif
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return;
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} |
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nvram_writeb(opaque, addr - s->chip_size, val); |
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} |
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static void nvram_writew_protected (void *opaque, target_phys_addr_t addr, uint32_t val) |
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{ |
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nvram_writeb_protected(opaque, addr, val & 0xff);
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nvram_writeb_protected(opaque, addr + 1, (val >> 8) & 0xff); |
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} |
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static void nvram_writel_protected (void *opaque, target_phys_addr_t addr, uint32_t val) |
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{ |
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nvram_writeb_protected(opaque, addr, val & 0xff);
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nvram_writeb_protected(opaque, addr + 1, (val >> 8) & 0xff); |
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nvram_writeb_protected(opaque, addr + 2, (val >> 16) & 0xff); |
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nvram_writeb_protected(opaque, addr + 3, (val >> 24) & 0xff); |
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} |
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static CPUReadMemoryFunc *nvram_read[] = {
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&nvram_readb, |
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&nvram_readw, |
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&nvram_readl, |
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}; |
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static CPUWriteMemoryFunc *nvram_write[] = {
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&nvram_writeb, |
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&nvram_writew, |
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&nvram_writel, |
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}; |
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static CPUWriteMemoryFunc *nvram_write_protected[] = {
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&nvram_writeb_protected, |
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&nvram_writew_protected, |
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&nvram_writel_protected, |
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}; |
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/* Initialisation routine */
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void *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_indexRW, mem_indexRP;
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QEMUFile *file; |
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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->chip_size = 0x2000; /* Fixed for ds1225y chip: 8 KiB */ |
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s->contents = qemu_mallocz(s->chip_size); |
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if (!s->contents) {
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return NULL; |
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} |
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s->mem_base = mem_base; |
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s->protection = 7;
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/* Read current file */
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file = qemu_fopen(filename, "rb");
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if (file) {
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/* Read nvram contents */
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qemu_get_buffer(file, s->contents, s->chip_size); |
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qemu_fclose(file); |
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} |
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s->file = qemu_fopen(filename, "wb");
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if (s->file) {
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/* Write back contents, as 'wb' mode cleaned the file */
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qemu_put_buffer(s->file, s->contents, s->chip_size); |
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qemu_fflush(s->file); |
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} |
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/* Read/write memory */
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mem_indexRW = cpu_register_io_memory(0, nvram_read, nvram_write, s);
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cpu_register_physical_memory(mem_base, s->chip_size, mem_indexRW); |
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/* Read/write protected memory */
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mem_indexRP = cpu_register_io_memory(0, nvram_read, nvram_write_protected, s);
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cpu_register_physical_memory(mem_base + s->chip_size, s->chip_size, mem_indexRP); |
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return s;
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} |