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sd-as3525v2.c: Implement 4 bit widebus for SD Transfers.

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git-svn-id: svn://svn.rockbox.org/rockbox/trunk@25820 a1c6a512-1295-4272-9138-f99709370657
This commit is contained in:
Jack Halpin 2010-05-05 04:35:08 +00:00
parent 145135f99f
commit 08641941bb
1 changed files with 22 additions and 8 deletions
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30
firmware/target/arm/as3525/sd-as3525v2.c
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@ -534,11 +534,29 @@ static int sd_init_card(const int drive)
sd_parse_csd(&card_info[drive]);
#ifndef HAVE_MULTIDRIVE
/* CMD7 w/rca: Select card to put it in TRAN state */
if(!send_cmd(drive, SD_SELECT_CARD, card_info[drive].rca, MCI_NO_RESP, NULL))
return -12;
#ifndef BOOTLOADER
/* Switch to to 4 bit widebus mode */
if(sd_wait_for_state(drive, SD_TRAN) < 0)
return -13;
/* CMD55 */
if(!send_cmd(drive, SD_APP_CMD, card_info[drive].rca, MCI_NO_RESP, NULL))
return -14;
/* ACMD6 */
if(!send_cmd(drive, SD_SET_BUS_WIDTH, 2, MCI_NO_RESP, NULL))
return -15;
mci_delay();
/* CMD55 */
if(!send_cmd(drive, SD_APP_CMD, card_info[drive].rca, MCI_NO_RESP, NULL))
return -16;
/* ACMD42 */
if(!send_cmd(drive, SD_SET_CLR_CARD_DETECT, 0, MCI_NO_RESP, NULL))
return -17;
/* Now that card is widebus make controller aware */
MCI_CTYPE |= (1<<drive);
#endif
card_info[drive].initialized = 1;
@ -783,11 +801,9 @@ static int sd_transfer_sectors(IF_MD2(int drive,) unsigned long start,
}
}
#ifdef HAVE_MULTIDRIVE
/* CMD7 w/rca: Select card to put it in TRAN state */
if(!send_cmd(drive, SD_SELECT_CARD, card_info[drive].rca, MCI_NO_RESP, NULL))
return -13;
#endif
return -18;
last_disk_activity = current_tick;
dma_retain();
@ -875,12 +891,10 @@ static int sd_transfer_sectors(IF_MD2(int drive,) unsigned long start,
dma_release();
#ifdef HAVE_MULTIDRIVE
/* CMD lines are separate, not common, so we need to actively deselect */
/* CMD7 w/rca =0 : deselects card & puts it in STBY state */
if(!send_cmd(drive, SD_DESELECT_CARD, 0, MCI_NO_RESP, NULL))
return -14;
#endif
return -19;
#ifndef BOOTLOADER
sd_enable(false);