1 files changed, 64 insertions, 0 deletions

diff --git a/firmware/drivers/sd.c b/firmware/drivers/sd.c
new file mode 100644
index 0000000000..834d8a19fd
--- /dev/null
+++ b/firmware/drivers/sd.c
@@ -0,0 +1,64 @@
+/***************************************************************************
+ *             __________               __   ___.
+ *   Open      \______   \ ____   ____ |  | _\_ |__   _______  ___
+ *   Source     |       _//  _ \_/ ___\|  |/ /| __ \ /  _ \  \/  /
+ *   Jukebox    |    |   (  <_> )  \___|    < | \_\ (  <_> > <  <
+ *   Firmware   |____|_  /\____/ \___  >__|_ \|___  /\____/__/\_ \
+ *                     \/            \/     \/    \/            \/
+ * $Id$
+ *
+ * Copyright © 2009 by Rafaël Carré
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version 2
+ * of the License, or (at your option) any later version.
+ *
+ * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
+ * KIND, either express or implied.
+ *
+ ****************************************************************************/
+
+#include "config.h"
+#include "hotswap.h"
+
+static const unsigned char sd_mantissa[] = {  /* *10 */
+    0,  10, 12, 13, 15, 20, 25, 30, 35, 40, 45, 50, 55, 60, 70, 80 };
+static const unsigned int sd_exponent[] = {  /* use varies */
+    1,10,100,1000,10000,100000,1000000,10000000,100000000,1000000000 };
+
+void sd_parse_csd(tCardInfo *card)
+{
+    unsigned int c_size, c_mult;
+    const int csd_version = card_extract_bits(card->csd, 127, 2);
+    if(csd_version == 0)
+    {
+        /* CSD version 1.0 */
+        int max_read_bl_len;
+
+        c_size = card_extract_bits(card->csd, 73, 12) + 1;
+        c_mult = 4 << card_extract_bits(card->csd, 49, 3);
+        max_read_bl_len = 1 << card_extract_bits(card->csd, 83, 4);
+        card->numblocks = c_size * c_mult * (max_read_bl_len/512);
+    }
+#ifdef HAVE_MULTIVOLUME
+    else if(csd_version == 1)
+    {
+        /* CSD version 2.0 */
+        c_size = card_extract_bits(card->csd, 69, 22) + 1;
+        card->numblocks = c_size << 10;
+    }
+#endif
+
+    card->blocksize = 512;  /* Always use 512 byte blocks */
+
+    card->speed = sd_mantissa[card_extract_bits(card->csd, 102, 4)] *
+                  sd_exponent[card_extract_bits(card->csd,  98, 3) + 4];
+
+    card->nsac = 100 * card_extract_bits(card->csd, 111, 8);
+
+    card->taac = sd_mantissa[card_extract_bits(card->csd, 118, 4)] *
+                 sd_exponent[card_extract_bits(card->csd, 114, 3)];
+
+    card->r2w_factor = card_extract_bits(card->csd, 28, 3);
+}