forked from len0rd/rockbox
97ebba1fbd
This leaves firmware/driver/sd.c only containing storage API wrappers Change-Id: I94f3f38c180f3802f479cdc54723fcd1b7782421
99 lines
3.5 KiB
C
99 lines
3.5 KiB
C
/***************************************************************************
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* __________ __ ___.
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* Open \______ \ ____ ____ | | _\_ |__ _______ ___
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* Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ /
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* Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < <
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* Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \
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* \/ \/ \/ \/ \/
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* $Id$
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*
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* Copyright (C) 2004 by Jens Arnold
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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*
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* This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
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* KIND, either express or implied.
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*
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****************************************************************************/
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#include "config.h"
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#include "logf.h"
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#include "sdmmc.h"
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static const unsigned char sd_mantissa[] = { /* *10 */
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0, 10, 12, 13, 15, 20, 25, 30, 35, 40, 45, 50, 55, 60, 70, 80 };
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static const unsigned int sd_exponent[] = { /* use varies, div10 */
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1,10,100,1000,10000,100000,1000000,10000000,100000000,1000000000 };
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void sd_parse_csd(tCardInfo *card)
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{
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unsigned int c_size, c_mult;
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const int csd_version = card_extract_bits(card->csd, 127, 2);
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if(csd_version == 0)
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{
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/* CSD version 1.0 */
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int max_read_bl_len;
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c_size = card_extract_bits(card->csd, 73, 12) + 1;
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c_mult = 4 << card_extract_bits(card->csd, 49, 3);
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max_read_bl_len = 1 << card_extract_bits(card->csd, 83, 4);
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card->numblocks = c_size * c_mult * (max_read_bl_len/512);
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}
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else if(csd_version == 1)
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{
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/* CSD version 2.0 */
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c_size = card_extract_bits(card->csd, 69, 22) + 1;
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card->numblocks = c_size << 10;
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}
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else if(csd_version == 2)
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{
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/* CSD version 3.0 */
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c_size = card_extract_bits(card->csd, 75, 28) + 1;
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card->numblocks = c_size << 10;
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}
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card->sd2plus = csd_version >= 1;
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card->blocksize = 512; /* Always use 512 byte blocks */
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card->speed = sd_mantissa[card_extract_bits(card->csd, 102, 4)] *
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sd_exponent[card_extract_bits(card->csd, 98, 3) + 4];
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card->nsac = 100 * card_extract_bits(card->csd, 111, 8);
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card->taac = sd_mantissa[card_extract_bits(card->csd, 118, 4)] *
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sd_exponent[card_extract_bits(card->csd, 114, 3)];
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card->r2w_factor = card_extract_bits(card->csd, 28, 3);
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logf("CSD%d.0 numblocks:%lld speed:%ld", csd_version+1, card->numblocks, card->speed);
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logf("nsac: %d taac: %ld r2w: %d", card->nsac, card->taac, card->r2w_factor);
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}
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/* helper function to extract n (<=32) bits from an arbitrary position.
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counting from MSB to LSB */
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unsigned long card_extract_bits(
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const unsigned long *p, /* the start of the bitfield array */
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unsigned int start, /* bit no. to start reading */
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unsigned int size) /* how many bits to read */
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{
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unsigned int long_index, bit_index;
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unsigned long result;
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/* we assume words of CSD/CID are stored most significant word first */
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start = 127 - start;
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long_index = start / 32;
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bit_index = start % 32;
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result = p[long_index] << bit_index;
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if (bit_index + size > 32) /* crossing longword boundary */
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result |= p[long_index+1] >> (32 - bit_index);
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result >>= 32 - size;
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return result;
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}
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