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path: root/drivers/mmc/mmc.c
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-rw-r--r--drivers/mmc/mmc.c121
1 files changed, 119 insertions, 2 deletions
diff --git a/drivers/mmc/mmc.c b/drivers/mmc/mmc.c
index 766bc54406e5..2d5b93000dee 100644
--- a/drivers/mmc/mmc.c
+++ b/drivers/mmc/mmc.c
@@ -4,6 +4,7 @@
4 * Copyright (C) 2003-2004 Russell King, All Rights Reserved. 4 * Copyright (C) 2003-2004 Russell King, All Rights Reserved.
5 * SD support Copyright (C) 2004 Ian Molton, All Rights Reserved. 5 * SD support Copyright (C) 2004 Ian Molton, All Rights Reserved.
6 * SD support Copyright (C) 2005 Pierre Ossman, All Rights Reserved. 6 * SD support Copyright (C) 2005 Pierre Ossman, All Rights Reserved.
7 * MMCv4 support Copyright (C) 2006 Philip Langdale, All Rights Reserved.
7 * 8 *
8 * This program is free software; you can redistribute it and/or modify 9 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License version 2 as 10 * it under the terms of the GNU General Public License version 2 as
@@ -953,6 +954,114 @@ static void mmc_read_csds(struct mmc_host *host)
953 } 954 }
954} 955}
955 956
957static void mmc_process_ext_csds(struct mmc_host *host)
958{
959 int err;
960 struct mmc_card *card;
961
962 struct mmc_request mrq;
963 struct mmc_command cmd;
964 struct mmc_data data;
965
966 struct scatterlist sg;
967
968 /*
969 * As the ext_csd is so large and mostly unused, we don't store the
970 * raw block in mmc_card.
971 */
972 u8 *ext_csd;
973 ext_csd = kmalloc(512, GFP_KERNEL);
974 if (!ext_csd) {
975 printk("%s: could not allocate a buffer to receive the ext_csd."
976 "mmc v4 cards will be treated as v3.\n",
977 mmc_hostname(host));
978 return;
979 }
980
981 list_for_each_entry(card, &host->cards, node) {
982 if (card->state & (MMC_STATE_DEAD|MMC_STATE_PRESENT))
983 continue;
984 if (mmc_card_sd(card))
985 continue;
986 if (card->csd.mmca_vsn < CSD_SPEC_VER_4)
987 continue;
988
989 err = mmc_select_card(host, card);
990 if (err != MMC_ERR_NONE) {
991 mmc_card_set_dead(card);
992 continue;
993 }
994
995 memset(&cmd, 0, sizeof(struct mmc_command));
996
997 cmd.opcode = MMC_SEND_EXT_CSD;
998 cmd.arg = 0;
999 cmd.flags = MMC_RSP_R1 | MMC_CMD_ADTC;
1000
1001 memset(&data, 0, sizeof(struct mmc_data));
1002
1003 mmc_set_data_timeout(&data, card, 0);
1004
1005 data.blksz = 512;
1006 data.blocks = 1;
1007 data.flags = MMC_DATA_READ;
1008 data.sg = &sg;
1009 data.sg_len = 1;
1010
1011 memset(&mrq, 0, sizeof(struct mmc_request));
1012
1013 mrq.cmd = &cmd;
1014 mrq.data = &data;
1015
1016 sg_init_one(&sg, ext_csd, 512);
1017
1018 mmc_wait_for_req(host, &mrq);
1019
1020 if (cmd.error != MMC_ERR_NONE || data.error != MMC_ERR_NONE) {
1021 mmc_card_set_dead(card);
1022 continue;
1023 }
1024
1025 switch (ext_csd[EXT_CSD_CARD_TYPE]) {
1026 case EXT_CSD_CARD_TYPE_52 | EXT_CSD_CARD_TYPE_26:
1027 card->ext_csd.hs_max_dtr = 52000000;
1028 break;
1029 case EXT_CSD_CARD_TYPE_26:
1030 card->ext_csd.hs_max_dtr = 26000000;
1031 break;
1032 default:
1033 /* MMC v4 spec says this cannot happen */
1034 printk("%s: card is mmc v4 but doesn't support "
1035 "any high-speed modes.\n",
1036 mmc_hostname(card->host));
1037 mmc_card_set_bad(card);
1038 continue;
1039 }
1040
1041 /* Activate highspeed support. */
1042 cmd.opcode = MMC_SWITCH;
1043 cmd.arg = (MMC_SWITCH_MODE_WRITE_BYTE << 24) |
1044 (EXT_CSD_HS_TIMING << 16) |
1045 (1 << 8) |
1046 EXT_CSD_CMD_SET_NORMAL;
1047 cmd.flags = MMC_RSP_R1B | MMC_CMD_AC;
1048
1049 err = mmc_wait_for_cmd(host, &cmd, CMD_RETRIES);
1050 if (err != MMC_ERR_NONE) {
1051 printk("%s: failed to switch card to mmc v4 "
1052 "high-speed mode.\n",
1053 mmc_hostname(card->host));
1054 continue;
1055 }
1056
1057 mmc_card_set_highspeed(card);
1058 }
1059
1060 kfree(ext_csd);
1061
1062 mmc_deselect_cards(host);
1063}
1064
956static void mmc_read_scrs(struct mmc_host *host) 1065static void mmc_read_scrs(struct mmc_host *host)
957{ 1066{
958 int err; 1067 int err;
@@ -1031,8 +1140,14 @@ static unsigned int mmc_calculate_clock(struct mmc_host *host)
1031 unsigned int max_dtr = host->f_max; 1140 unsigned int max_dtr = host->f_max;
1032 1141
1033 list_for_each_entry(card, &host->cards, node) 1142 list_for_each_entry(card, &host->cards, node)
1034 if (!mmc_card_dead(card) && max_dtr > card->csd.max_dtr) 1143 if (!mmc_card_dead(card)) {
1035 max_dtr = card->csd.max_dtr; 1144 if (mmc_card_highspeed(card)) {
1145 if (max_dtr > card->ext_csd.hs_max_dtr)
1146 max_dtr = card->ext_csd.hs_max_dtr;
1147 } else if (max_dtr > card->csd.max_dtr) {
1148 max_dtr = card->csd.max_dtr;
1149 }
1150 }
1036 1151
1037 pr_debug("%s: selected %d.%03dMHz transfer rate\n", 1152 pr_debug("%s: selected %d.%03dMHz transfer rate\n",
1038 mmc_hostname(host), 1153 mmc_hostname(host),
@@ -1152,6 +1267,8 @@ static void mmc_setup(struct mmc_host *host)
1152 1267
1153 if (host->mode == MMC_MODE_SD) 1268 if (host->mode == MMC_MODE_SD)
1154 mmc_read_scrs(host); 1269 mmc_read_scrs(host);
1270 else
1271 mmc_process_ext_csds(host);
1155} 1272}
1156 1273
1157 1274