From d95211a23d974d175a8609fa3efc7ca43d403993 Mon Sep 17 00:00:00 2001 From: Jack Halpin Date: Thu, 25 Feb 2010 06:46:16 +0000 Subject: sd-as3525v2: Controller and card init much more reliably now. Remove MCI_HCON read from init_controller() as it now appears unneccesary. Make sd-init_card() use similar init sequence to the one in sd-as3525. git-svn-id: svn://svn.rockbox.org/rockbox/trunk@24903 a1c6a512-1295-4272-9138-f99709370657 --- firmware/target/arm/as3525/sd-as3525v2.c | 84 ++++++++++++-------------------- 1 file changed, 31 insertions(+), 53 deletions(-) (limited to 'firmware/target/arm/as3525/sd-as3525v2.c') diff --git a/firmware/target/arm/as3525/sd-as3525v2.c b/firmware/target/arm/as3525/sd-as3525v2.c index 52db0c0420..0b2699e505 100644 --- a/firmware/target/arm/as3525/sd-as3525v2.c +++ b/firmware/target/arm/as3525/sd-as3525v2.c @@ -395,88 +395,73 @@ static int sd_init_card(void) { unsigned long response; unsigned long temp_reg[4]; - int max_tries = 100; /* max acmd41 attemps */ - bool sd_v2; + long init_timeout; + bool sd_v2 = false; int i; /* assume 24 MHz clock / 60 = 400 kHz */ MCI_CLKDIV = (MCI_CLKDIV & ~(0xFF)) | 0x3C; /* CLK_DIV_0 : bits 7:0 */ + /* 100 - 400kHz clock required for Identification Mode */ + /* Start of Card Identification Mode ************************************/ + + /* CMD0 Go Idle */ if(!send_cmd(SD_GO_IDLE_STATE, 0, MCI_NO_RESP, NULL)) return -1; - mci_delay(); - sd_v2 = false; + /* CMD8 Check for v2 sd card. Must be sent before using ACMD41 + Non v2 cards will not respond to this command*/ if(send_cmd(SD_SEND_IF_COND, 0x1AA, MCI_RESP, &response)) if((response & 0xFFF) == 0x1AA) sd_v2 = true; + /* timeout for initialization is 1sec, from SD Specification 2.00 */ + init_timeout = current_tick + HZ; + do { - /* some MicroSD cards seems to need more delays, so play safe */ - mci_delay(); - mci_delay(); - mci_delay(); + /* this timeout is the only valid error for this loop*/ + if(TIME_AFTER(current_tick, init_timeout)) + return -2; /* app_cmd */ - if( !send_cmd(SD_APP_CMD, 0, MCI_RESP, &response) || - !(response & (1<<5))) - { - return -2; - } + send_cmd(SD_APP_CMD, 0, MCI_RESP, &response); - /* acmd41 */ + /* ACMD41 For v2 cards set HCS bit[30] & send host voltage range to all */ if(!send_cmd(SD_APP_OP_COND, (sd_v2 ? 0x40FF8000 : (1<<23)), MCI_RESP, &card_info.ocr)) return -3; - } while(!(card_info.ocr & (1<<31)) && max_tries--); + } while(!(card_info.ocr & (1<<31)) ); - if(max_tries < 0) - return -4; - - mci_delay(); - mci_delay(); - mci_delay(); - - /* send CID */ + /* CMD2 send CID */ if(!send_cmd(SD_ALL_SEND_CID, 0, MCI_RESP|MCI_LONG_RESP, card_info.cid)) return -5; - /* send RCA */ + for(i=0; i<4; i++) + card_info.cid[3-i] = temp_reg[i]; + + /* CMD3 send RCA */ if(!send_cmd(SD_SEND_RELATIVE_ADDR, 0, MCI_RESP, &card_info.rca)) - return -6; + return -4; + + /* End of Card Identification Mode ************************************/ - /* send CSD */ + /* CMD9 send CSD */ if(!send_cmd(SD_SEND_CSD, card_info.rca, MCI_RESP|MCI_LONG_RESP, temp_reg)) - return -7; + return -5; for(i=0; i<4; i++) card_info.csd[3-i] = temp_reg[i]; sd_parse_csd(&card_info); - if(!send_cmd(SD_APP_CMD, 0, MCI_RESP, &response) || - !send_cmd(42, 0, MCI_NO_RESP, NULL)) /* disconnect the 50 KOhm pull-up - resistor on CD/DAT3 */ - return -13; - - if(!send_cmd(SD_APP_CMD, card_info.rca, MCI_NO_RESP, NULL)) - return -10; - - if(!send_cmd(SD_SET_BUS_WIDTH, card_info.rca | 2, MCI_NO_RESP, NULL)) - return -11; + /* Card back to full speed */ + MCI_CLKDIV &= ~(0xFF); /* CLK_DIV_0 : bits 7:0 = 0x00 */ + /* CMD7 w/rca: Select card to put it in TRAN state */ if(!send_cmd(SD_SELECT_CARD, card_info.rca, MCI_NO_RESP, NULL)) - return -9; - - /* not sent in init_card() by OF */ - if(!send_cmd(SD_SET_BLOCKLEN, card_info.blocksize, MCI_NO_RESP, - NULL)) - return -12; - - /* Card back to full speed */ - MCI_CLKDIV &= ~(0xFF); /* CLK_DIV_0 : bits 7:0 */ + return -6; card_info.initialized = 1; @@ -529,13 +514,6 @@ static void sd_thread(void) static void init_controller(void) { - - int temp = MCI_HCON; /* we just need to read HCON */ - (void)temp; -// panicf("HCON: %8x",temp); -// int idx = (MCI_HCON >> 1) & 31; /* Maximum card Index */ -// int idx_bits = (1 << idx) -1; - MCI_PWREN = 0x0; /* power off all cards */ MCI_CLKSRC = 0x00; /* All CLK_SRC_CRD set to 0*/ -- cgit v1.2.3