diff options
Diffstat (limited to 'drivers/mmc/core/mmc_ops.c')
| -rw-r--r-- | drivers/mmc/core/mmc_ops.c | 276 |
1 files changed, 276 insertions, 0 deletions
diff --git a/drivers/mmc/core/mmc_ops.c b/drivers/mmc/core/mmc_ops.c new file mode 100644 index 000000000000..7dd720fa5895 --- /dev/null +++ b/drivers/mmc/core/mmc_ops.c @@ -0,0 +1,276 @@ +/* + * linux/drivers/mmc/mmc_ops.h + * + * Copyright 2006-2007 Pierre Ossman + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or (at + * your option) any later version. + */ + +#include <linux/types.h> +#include <asm/scatterlist.h> +#include <linux/scatterlist.h> + +#include <linux/mmc/host.h> +#include <linux/mmc/card.h> +#include <linux/mmc/mmc.h> + +#include "core.h" +#include "mmc_ops.h" + +static int _mmc_select_card(struct mmc_host *host, struct mmc_card *card) +{ + int err; + struct mmc_command cmd; + + BUG_ON(!host); + + memset(&cmd, 0, sizeof(struct mmc_command)); + + cmd.opcode = MMC_SELECT_CARD; + + if (card) { + cmd.arg = card->rca << 16; + cmd.flags = MMC_RSP_R1 | MMC_CMD_AC; + } else { + cmd.arg = 0; + cmd.flags = MMC_RSP_NONE | MMC_CMD_AC; + } + + err = mmc_wait_for_cmd(host, &cmd, MMC_CMD_RETRIES); + if (err != MMC_ERR_NONE) + return err; + + return MMC_ERR_NONE; +} + +int mmc_select_card(struct mmc_card *card) +{ + BUG_ON(!card); + + return _mmc_select_card(card->host, card); +} + +int mmc_deselect_cards(struct mmc_host *host) +{ + return _mmc_select_card(host, NULL); +} + +int mmc_go_idle(struct mmc_host *host) +{ + int err; + struct mmc_command cmd; + + mmc_set_chip_select(host, MMC_CS_HIGH); + + mmc_delay(1); + + memset(&cmd, 0, sizeof(struct mmc_command)); + + cmd.opcode = MMC_GO_IDLE_STATE; + cmd.arg = 0; + cmd.flags = MMC_RSP_NONE | MMC_CMD_BC; + + err = mmc_wait_for_cmd(host, &cmd, 0); + + mmc_delay(1); + + mmc_set_chip_select(host, MMC_CS_DONTCARE); + + mmc_delay(1); + + return err; +} + +int mmc_send_op_cond(struct mmc_host *host, u32 ocr, u32 *rocr) +{ + struct mmc_command cmd; + int i, err = 0; + + BUG_ON(!host); + + memset(&cmd, 0, sizeof(struct mmc_command)); + + cmd.opcode = MMC_SEND_OP_COND; + cmd.arg = ocr; + cmd.flags = MMC_RSP_R3 | MMC_CMD_BCR; + + for (i = 100; i; i--) { + err = mmc_wait_for_cmd(host, &cmd, 0); + if (err != MMC_ERR_NONE) + break; + + if (cmd.resp[0] & MMC_CARD_BUSY || ocr == 0) + break; + + err = MMC_ERR_TIMEOUT; + + mmc_delay(10); + } + + if (rocr) + *rocr = cmd.resp[0]; + + return err; +} + +int mmc_all_send_cid(struct mmc_host *host, u32 *cid) +{ + int err; + struct mmc_command cmd; + + BUG_ON(!host); + BUG_ON(!cid); + + memset(&cmd, 0, sizeof(struct mmc_command)); + + cmd.opcode = MMC_ALL_SEND_CID; + cmd.arg = 0; + cmd.flags = MMC_RSP_R2 | MMC_CMD_BCR; + + err = mmc_wait_for_cmd(host, &cmd, MMC_CMD_RETRIES); + if (err != MMC_ERR_NONE) + return err; + + memcpy(cid, cmd.resp, sizeof(u32) * 4); + + return MMC_ERR_NONE; +} + +int mmc_set_relative_addr(struct mmc_card *card) +{ + int err; + struct mmc_command cmd; + + BUG_ON(!card); + BUG_ON(!card->host); + + memset(&cmd, 0, sizeof(struct mmc_command)); + + cmd.opcode = MMC_SET_RELATIVE_ADDR; + cmd.arg = card->rca << 16; + cmd.flags = MMC_RSP_R1 | MMC_CMD_AC; + + err = mmc_wait_for_cmd(card->host, &cmd, MMC_CMD_RETRIES); + if (err != MMC_ERR_NONE) + return err; + + return MMC_ERR_NONE; +} + +int mmc_send_csd(struct mmc_card *card, u32 *csd) +{ + int err; + struct mmc_command cmd; + + BUG_ON(!card); + BUG_ON(!card->host); + BUG_ON(!csd); + + memset(&cmd, 0, sizeof(struct mmc_command)); + + cmd.opcode = MMC_SEND_CSD; + cmd.arg = card->rca << 16; + cmd.flags = MMC_RSP_R2 | MMC_CMD_AC; + + err = mmc_wait_for_cmd(card->host, &cmd, MMC_CMD_RETRIES); + if (err != MMC_ERR_NONE) + return err; + + memcpy(csd, cmd.resp, sizeof(u32) * 4); + + return MMC_ERR_NONE; +} + +int mmc_send_ext_csd(struct mmc_card *card, u8 *ext_csd) +{ + struct mmc_request mrq; + struct mmc_command cmd; + struct mmc_data data; + struct scatterlist sg; + + BUG_ON(!card); + BUG_ON(!card->host); + BUG_ON(!ext_csd); + + memset(&mrq, 0, sizeof(struct mmc_request)); + memset(&cmd, 0, sizeof(struct mmc_command)); + memset(&data, 0, sizeof(struct mmc_data)); + + mrq.cmd = &cmd; + mrq.data = &data; + + cmd.opcode = MMC_SEND_EXT_CSD; + cmd.arg = 0; + cmd.flags = MMC_RSP_R1 | MMC_CMD_ADTC; + + data.blksz = 512; + data.blocks = 1; + data.flags = MMC_DATA_READ; + data.sg = &sg; + data.sg_len = 1; + + sg_init_one(&sg, ext_csd, 512); + + mmc_set_data_timeout(&data, card, 0); + + mmc_wait_for_req(card->host, &mrq); + + if (cmd.error != MMC_ERR_NONE) + return cmd.error; + if (data.error != MMC_ERR_NONE) + return data.error; + + return MMC_ERR_NONE; +} + +int mmc_switch(struct mmc_card *card, u8 set, u8 index, u8 value) +{ + int err; + struct mmc_command cmd; + + BUG_ON(!card); + BUG_ON(!card->host); + + memset(&cmd, 0, sizeof(struct mmc_command)); + + cmd.opcode = MMC_SWITCH; + cmd.arg = (MMC_SWITCH_MODE_WRITE_BYTE << 24) | + (index << 16) | + (value << 8) | + set; + cmd.flags = MMC_RSP_R1B | MMC_CMD_AC; + + err = mmc_wait_for_cmd(card->host, &cmd, MMC_CMD_RETRIES); + if (err != MMC_ERR_NONE) + return err; + + return MMC_ERR_NONE; +} + +int mmc_send_status(struct mmc_card *card, u32 *status) +{ + int err; + struct mmc_command cmd; + + BUG_ON(!card); + BUG_ON(!card->host); + + memset(&cmd, 0, sizeof(struct mmc_command)); + + cmd.opcode = MMC_SEND_STATUS; + cmd.arg = card->rca << 16; + cmd.flags = MMC_RSP_R1 | MMC_CMD_AC; + + err = mmc_wait_for_cmd(card->host, &cmd, MMC_CMD_RETRIES); + if (err != MMC_ERR_NONE) + return err; + + if (status) + *status = cmd.resp[0]; + + return MMC_ERR_NONE; +} + |