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AMS Sansa: Adjust SD Card frequency to Identification frequency at beginning of card init instead of the end of pl180 controller init.

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If a card is reinitialized now the ident frequency is used instead of the bypass frequency during the identification phase.

Added comments throughout sd_init_card() to help follow init process and highlight indent stage.

git-svn-id: svn://svn.rockbox.org/rockbox/trunk@23256 a1c6a512-1295-4272-9138-f99709370657
This commit is contained in:
Jack Halpin 2009-10-19 05:34:25 +00:00
parent a5fd68d13d
commit c5a3f93ac3
1 changed files with 31 additions and 14 deletions
Download patch file Download diff file Expand all files Collapse all files

45
firmware/target/arm/as3525/ata_sd_as3525.c
View file

@ -246,12 +246,22 @@ static int sd_init_card(const int drive)
unsigned long temp_reg[4];
int i;
/* 100 - 400kHz clock required for Identification Mode */
MCI_CLOCK(drive) = (MCI_CLOCK(drive) & 0xf00) | AS3525_SD_IDENT_DIV;
/* Start of Card Identification Mode ************************************/
/* CMD0 Go Idle */
if(!send_cmd(drive, SD_GO_IDLE_STATE, 0, MCI_NO_FLAGS, NULL))
return -1;
mci_delay();
/* CMD8 Check for v2 sd card */
/* CMD8 Check for v2 sd card. Must be sent before using ACMD41
Non v2 cards will not respond to this command*/
if(send_cmd(drive, SD_SEND_IF_COND, 0x1AA, MCI_RESP|MCI_ARG, &response))
if((response & 0xFFF) == 0x1AA)
sd_v2 = true;
@ -270,7 +280,7 @@ static int sd_init_card(const int drive)
return -3;
}
/* acmd41 If we have a v2 sd card set HCS bit[30] with voltage range */
/* ACMD41 For v2 cards set HCS bit[30] & send host voltage range to all */
if(!send_cmd(drive, SD_APP_OP_COND, (0x00FF8000 | (sd_v2 ? 1<<30 : 0)),
MCI_RESP|MCI_ARG, &card_info[drive].ocr))
{
@ -279,10 +289,7 @@ static int sd_init_card(const int drive)
} while(!(card_info[drive].ocr & (1<<31)));
MCI_CLOCK(drive) |= MCI_CLOCK_BYPASS; /* full speed for controller clock */
mci_delay();
/* send CID */
/* CMD2 send CID */
if(!send_cmd(drive, SD_ALL_SEND_CID, 0, MCI_RESP|MCI_LONG_RESP|MCI_ARG,
temp_reg))
return -5;
@ -290,12 +297,20 @@ static int sd_init_card(const int drive)
for(i=0; i<4; i++)
card_info[drive].cid[3-i] = temp_reg[i];
/* send RCA */
/* CMD3 send RCA */
if(!send_cmd(drive, SD_SEND_RELATIVE_ADDR, 0, MCI_RESP|MCI_ARG,
&card_info[drive].rca))
return -6;
/* Select card to put it in TRAN state */
/* End of Card Identification Mode ************************************/
/* full speed for controller clock MCICLK = MCLK = PCLK = 62 MHz */
MCI_CLOCK(drive) |= MCI_CLOCK_BYPASS; /* FIXME: 50 MHz is spec limit */
mci_delay();
/* CMD7 w/rca: Select card to put it in TRAN state */
if(!send_cmd(drive, SD_SELECT_CARD, card_info[drive].rca, MCI_ARG, NULL))
return -7;
@ -304,16 +319,18 @@ static int sd_init_card(const int drive)
{
if(sd_wait_for_state(drive, SD_TRAN))
return -8;
/* CMD6 */
if(!send_cmd(drive, SD_SWITCH_FUNC, 0x80fffff1, MCI_ARG, NULL))
return -9;
mci_delay();
}
/* go back to STBY state so we can read csd */
/* CMD7 w/rca=0: Deselect card to put it in STBY state */
if(!send_cmd(drive, SD_DESELECT_CARD, 0, MCI_ARG, NULL))
return -10;
/* send CSD */
/* CMD9 send CSD */
if(!send_cmd(drive, SD_SEND_CSD, card_info[drive].rca,
MCI_RESP|MCI_LONG_RESP|MCI_ARG, temp_reg))
return -11;
@ -323,7 +340,7 @@ static int sd_init_card(const int drive)
sd_parse_csd(&card_info[drive]);
/* Select card to put back in TRAN state */
/* CMD7 w/rca: Select card to put it in TRAN state */
if(!send_cmd(drive, SD_SELECT_CARD, card_info[drive].rca, MCI_ARG, NULL))
return -12;
@ -440,8 +457,8 @@ static void init_pl180_controller(const int drive)
MCI_COMMAND(drive) = MCI_DATA_CTRL(drive) = 0;
MCI_CLEAR(drive) = 0x7ff;
MCI_MASK0(drive) = MCI_MASK1(drive) = MCI_ERROR | MCI_DATA_END;
MCI_MASK0(drive) = MCI_ERROR | MCI_DATA_END;
MCI_MASK1(drive) = 0;
#ifdef HAVE_MULTIDRIVE
VIC_INT_ENABLE |=
(drive == INTERNAL_AS3525) ? INTERRUPT_NAND : INTERRUPT_MCI0;
@ -459,7 +476,7 @@ static void init_pl180_controller(const int drive)
VIC_INT_ENABLE |= INTERRUPT_NAND;
#endif
MCI_POWER(drive) = MCI_POWER_UP|(10 /*voltage*/ << 2); /* use OF voltage */
MCI_POWER(drive) = MCI_POWER_UP | (MCI_VDD_3_0); /* OF Setting */
mci_delay();
MCI_POWER(drive) |= MCI_POWER_ON;
@ -467,7 +484,7 @@ static void init_pl180_controller(const int drive)
MCI_SELECT(drive) = 0;
MCI_CLOCK(drive) = MCI_CLOCK_ENABLE | AS3525_SD_IDENT_DIV;
MCI_CLOCK(drive) = MCI_CLOCK_ENABLE;
mci_delay();
}