firmware/drivers/ramdisk.c

   1 /***************************************************************************
   2  *             __________               __   ___.
   3  *   Open      \______   \ ____   ____ |  | _\_ |__   _______  ___
   4  *   Source     |       _//  _ \_/ ___\|  |/ /| __ \ /  _ \  \/  /
   5  *   Jukebox    |    |   (  <_> )  \___|    < | \_\ (  <_> > <  <
   6  *   Firmware   |____|_  /\____/ \___  >__|_ \|___  /\____/__/\_ \
   7  *                     \/            \/     \/    \/            \/
   8  * $Id: ramdisk.c 18965 2008-11-01 17:33:21Z gevaerts $
   9  *
  10  * Copyright (C) 2008 Frank Gevaerts
  11  *
  12  * This program is free software; you can redistribute it and/or
  13  * modify it under the terms of the GNU General Public License
  14  * as published by the Free Software Foundation; either version 2
  15  * of the License, or (at your option) any later version.
  16  *
  17  * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
  18  * KIND, either express or implied.
  19  *
  20  ****************************************************************************/
  21
  22 #include <stdbool.h>
  23 #include <string.h>
  24
  25 #include "storage.h"
  26
  27 #define SECTOR_SIZE 512
  28 #define NUM_SECTORS 16384
  29
  30 unsigned char ramdisk[SECTOR_SIZE * NUM_SECTORS];
  31
  32 long last_disk_activity = -1;
  33
  34 int ramdisk_read_sectors(IF_MV2(int drive,)
  35                      unsigned long start,
  36                      int count,
  37                      void* buf)
  38 {
  39     if(start+count>=NUM_SECTORS)
  40     {
  41         return -1;
  42     }
  43     memcpy(buf,&ramdisk[start*SECTOR_SIZE],count*SECTOR_SIZE);
  44     return 0;
  45 }
  46
  47 int ramdisk_write_sectors(IF_MV2(int drive,)
  48                       unsigned long start,
  49                       int count,
  50                       const void* buf)
  51 {
  52     if(start+count>=NUM_SECTORS)
  53     {
  54         return -1;
  55     }
  56     memcpy(&ramdisk[start*SECTOR_SIZE],buf,count*SECTOR_SIZE);
  57     return 0;
  58 }
  59
  60 int ramdisk_init(void)
  61 {
  62     return 0;
  63 }
  64
  65 long ramdisk_last_disk_activity(void)
  66 {
  67     return last_disk_activity;
  68 }
  69
  70 void ramdisk_sleep(void)
  71 {
  72 }
  73
  74 void ramdisk_spin(void)
  75 {
  76 }
  77
  78 void ramdisk_sleepnow(void)
  79 {
  80 }
  81
  82 void ramdisk_spindown(int seconds)
  83 {
  84     (void)seconds;
  85 }
  86 #ifdef STORAGE_GET_INFO
  87 void ramdisk_get_info(IF_MV2(int drive,) struct storage_info *info)
  88 {
  89     /* firmware version */
  90     info->revision="0.00";
  91
  92     /* vendor field, need better name? */
  93     info->vendor="Rockbox";
  94     /* model field, need better name? */
  95     info->product="Ramdisk";
  96
  97     /* blocks count */
  98     info->num_sectors=NUM_SECTORS;
  99     info->sector_size=SECTOR_SIZE;
 100 }
 101 #endif
 102