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Annotation of qemu/hw/ds1225y.c, revision 1.1.1.1

1.1       root        1: /*
                      2:  * QEMU NVRAM emulation for DS1225Y chip
                      3:  * 
                      4:  * Copyright (c) 2007 Herv� Poussineau
                      5:  * 
                      6:  * Permission is hereby granted, free of charge, to any person obtaining a copy
                      7:  * of this software and associated documentation files (the "Software"), to deal
                      8:  * in the Software without restriction, including without limitation the rights
                      9:  * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
                     10:  * copies of the Software, and to permit persons to whom the Software is
                     11:  * furnished to do so, subject to the following conditions:
                     12:  *
                     13:  * The above copyright notice and this permission notice shall be included in
                     14:  * all copies or substantial portions of the Software.
                     15:  *
                     16:  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
                     17:  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
                     18:  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
                     19:  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
                     20:  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
                     21:  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
                     22:  * THE SOFTWARE.
                     23:  */
                     24: 
                     25: #include "hw.h"
                     26: #include "mips.h"
                     27: #include "nvram.h"
                     28: 
                     29: typedef enum
                     30: {
                     31:     none = 0,
                     32:     readmode,
                     33:     writemode,
                     34: } nvram_open_mode;
                     35: 
                     36: struct ds1225y_t
                     37: {
                     38:     target_phys_addr_t mem_base;
                     39:     uint32_t capacity;
                     40:     const char *filename;
                     41:     QEMUFile *file;
                     42:     nvram_open_mode open_mode;
                     43: };
                     44: 
                     45: static int ds1225y_set_to_mode(ds1225y_t *NVRAM, nvram_open_mode mode, const char *filemode)
                     46: {
                     47:     if (NVRAM->open_mode != mode)
                     48:     {
                     49:         if (NVRAM->file)
                     50:             qemu_fclose(NVRAM->file);
                     51:         NVRAM->file = qemu_fopen(NVRAM->filename, filemode);
                     52:         NVRAM->open_mode = mode;
                     53:     }
                     54:     return (NVRAM->file != NULL);
                     55: }
                     56: 
                     57: static uint32_t nvram_readb (void *opaque, target_phys_addr_t addr)
                     58: {
                     59:     ds1225y_t *NVRAM = opaque;
                     60:     int64_t pos;
                     61: 
                     62:     pos = addr - NVRAM->mem_base;
                     63:     if (addr >= NVRAM->capacity)
                     64:         addr -= NVRAM->capacity;
                     65: 
                     66:     if (!ds1225y_set_to_mode(NVRAM, readmode, "rb"))
                     67:         return 0;
                     68:     qemu_fseek(NVRAM->file, pos, SEEK_SET);
                     69:     return (uint32_t)qemu_get_byte(NVRAM->file);
                     70: }
                     71: 
                     72: static void nvram_writeb (void *opaque, target_phys_addr_t addr, uint32_t value)
                     73: {
                     74:     ds1225y_t *NVRAM = opaque;
                     75:     int64_t pos;
                     76: 
                     77:     pos = addr - NVRAM->mem_base;
                     78:     if (ds1225y_set_to_mode(NVRAM, writemode, "wb"))
                     79:     {
                     80:         qemu_fseek(NVRAM->file, pos, SEEK_SET);
                     81:         qemu_put_byte(NVRAM->file, (int)value);
                     82:     }
                     83: }
                     84: 
                     85: static CPUReadMemoryFunc *nvram_read[] = {
                     86:     &nvram_readb,
                     87:     NULL,
                     88:     NULL,
                     89: };
                     90: 
                     91: static CPUWriteMemoryFunc *nvram_write[] = {
                     92:     &nvram_writeb,
                     93:     NULL,
                     94:     NULL,
                     95: };
                     96: 
                     97: static CPUWriteMemoryFunc *nvram_none[] = {
                     98:     NULL,
                     99:     NULL,
                    100:     NULL,
                    101: };
                    102: 
                    103: /* Initialisation routine */
                    104: ds1225y_t *ds1225y_init(target_phys_addr_t mem_base, const char *filename)
                    105: {
                    106:     ds1225y_t *s;
                    107:     int mem_index1, mem_index2;
                    108: 
                    109:     s = qemu_mallocz(sizeof(ds1225y_t));
                    110:     if (!s)
                    111:         return NULL;
                    112:     s->mem_base = mem_base;
                    113:     s->capacity = 0x2000; /* Fixed for ds1225y chip: 8K */
                    114:     s->filename = filename;
                    115: 
                    116:     /* Read/write memory */
                    117:     mem_index1 = cpu_register_io_memory(0, nvram_read, nvram_write, s);
                    118:     cpu_register_physical_memory(mem_base, s->capacity, mem_index1);
                    119:     /* Read-only memory */
                    120:     mem_index2 = cpu_register_io_memory(0, nvram_read, nvram_none, s);
                    121:     cpu_register_physical_memory(mem_base + s->capacity, s->capacity, mem_index2);
                    122:     return s;
                    123: }

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