firmware/drivers/sd.c

   1 /***************************************************************************
   2  *             __________               __   ___.
   3  *   Open      \______   \ ____   ____ |  | _\_ |__   _______  ___
   4  *   Source     |       _//  _ \_/ ___\|  |/ /| __ \ /  _ \  \/  /
   5  *   Jukebox    |    |   (  <_> )  \___|    < | \_\ (  <_> > <  <
   6  *   Firmware   |____|_  /\____/ \___  >__|_ \|___  /\____/__/\_ \
   7  *                     \/            \/     \/    \/            \/
   8  * $Id$
   9  *
  10  * Copyright © 2009 by Rafaël Carré
  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 "config.h"
  23 #include "logf.h"
  24 #include "hotswap.h"
  25 #include "storage.h"
  26
  27 static const unsigned char sd_mantissa[] = {  /* *10 */
  28     0,  10, 12, 13, 15, 20, 25, 30, 35, 40, 45, 50, 55, 60, 70, 80 };
  29 static const unsigned int sd_exponent[] = {  /* use varies */
  30     1,10,100,1000,10000,100000,1000000,10000000,100000000,1000000000 };
  31
  32 void sd_parse_csd(tCardInfo *card)
  33 {
  34     unsigned int c_size, c_mult;
  35     const int csd_version = card_extract_bits(card->csd, 127, 2);
  36     if(csd_version == 0)
  37     {
  38         /* CSD version 1.0 */
  39         int max_read_bl_len;
  40
  41         c_size = card_extract_bits(card->csd, 73, 12) + 1;
  42         c_mult = 4 << card_extract_bits(card->csd, 49, 3);
  43         max_read_bl_len = 1 << card_extract_bits(card->csd, 83, 4);
  44         card->numblocks = c_size * c_mult * (max_read_bl_len/512);
  45     }
  46     else if(csd_version == 1)
  47     {
  48         /* CSD version 2.0 */
  49         c_size = card_extract_bits(card->csd, 69, 22) + 1;
  50         card->numblocks = c_size << 10;
  51     }
  52
  53     card->blocksize = 512;  /* Always use 512 byte blocks */
  54
  55     card->speed = sd_mantissa[card_extract_bits(card->csd, 102, 4)] *
  56                   sd_exponent[card_extract_bits(card->csd,  98, 3) + 4];
  57
  58     card->nsac = 100 * card_extract_bits(card->csd, 111, 8);
  59
  60     card->taac = sd_mantissa[card_extract_bits(card->csd, 118, 4)] *
  61                  sd_exponent[card_extract_bits(card->csd, 114, 3)];
  62
  63     card->r2w_factor = card_extract_bits(card->csd, 28, 3);
  64
  65     logf("CSD%d.0 numblocks:%d speed:%d", csd_version+1, card->numblocks, card->speed);
  66     logf("nsac: %d taac: %d r2w: %d", card->nsac, card->taac, card->r2w_factor);
  67 }
  68
  69 void sd_sleep(void)
  70 {
  71 }
  72
  73 void sd_spin(void)
  74 {
  75 }
  76
  77 void sd_spindown(int seconds)
  78 {
  79     (void)seconds;
  80 }
  81
  82 #ifdef STORAGE_GET_INFO
  83 void sd_get_info(IF_MV2(int drive,) struct storage_info *info)
  84 {
  85 #ifndef HAVE_MULTIVOLUME
  86     const int drive=0;
  87 #endif
  88
  89     tCardInfo *card = card_get_info_target(drive);
  90
  91     info->sector_size=card->blocksize;
  92     info->num_sectors=card->numblocks;
  93     info->vendor="Rockbox";
  94 #if CONFIG_STORAGE == STORAGE_SD
  95     info->product = (drive==0) ? "Internal Storage" : "SD Card Slot";
  96 #else   /* Internal storage is not SD */
  97     info->product = "SD Card Slot";
  98 #endif
  99     info->revision="0.00";
 100 }
 101 #endif
 102