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Message-ID: <CAGxe1ZG5JS2+tGaLSH1FCcxrOKx9itLyY=BEUgGvAB6v+7DRNw@mail.gmail.com>
Date: Wed, 2 Nov 2011 06:59:30 -0400
From: Girish K S <girish.shivananjappa@...aro.org>
To: Seungwon Jeon <tgih.jun@...sung.com>
Cc: linux-mmc@...r.kernel.org, Chris Ball <cjb@...top.org>,
linux-kernel@...r.kernel.org, linux-samsung-soc@...r.kernel.org,
kgene.kim@...sung.com, dh.han@...sung.com
Subject: Re: [PATCH 2/2] mmc: core: Support packed command for eMMC4.5 device
On 2 November 2011 04:03, Seungwon Jeon <tgih.jun@...sung.com> wrote:
> This patch supports packed command of eMMC4.5 device.
> Several reads(or writes) can be grouped in packed command
> and all data of the individual commands can be sent in a
> single transfer on the bus.
>
> Signed-off-by: Seungwon Jeon <tgih.jun@...sung.com>
> ---
> drivers/mmc/card/block.c | 355 ++++++++++++++++++++++++++++++++++++++++++++--
> drivers/mmc/card/queue.c | 48 ++++++-
> drivers/mmc/card/queue.h | 12 ++
> include/linux/mmc/core.h | 3 +
> 4 files changed, 404 insertions(+), 14 deletions(-)
>
> diff --git a/drivers/mmc/card/block.c b/drivers/mmc/card/block.c
> index a1cb21f..6c49656 100644
> --- a/drivers/mmc/card/block.c
> +++ b/drivers/mmc/card/block.c
> @@ -59,6 +59,13 @@ MODULE_ALIAS("mmc:block");
> #define INAND_CMD38_ARG_SECTRIM1 0x81
> #define INAND_CMD38_ARG_SECTRIM2 0x88
>
> +#define mmc_req_rel_wr(req) (((req->cmd_flags & REQ_FUA) || \
> + (req->cmd_flags & REQ_META)) && \
> + (rq_data_dir(req) == WRITE))
> +#define PACKED_CMD_VER 0x01
> +#define PACKED_CMD_RD 0x01
> +#define PACKED_CMD_WR 0x02
> +
> static DEFINE_MUTEX(block_mutex);
>
> /*
> @@ -943,7 +950,8 @@ static int mmc_blk_err_check(struct mmc_card *card,
> * kind. If it was a write, we may have transitioned to
> * program mode, which we have to wait for it to complete.
> */
> - if (!mmc_host_is_spi(card->host) && rq_data_dir(req) != READ) {
> + if ((!mmc_host_is_spi(card->host) && rq_data_dir(req) != READ) ||
> + (mq_mrq->packed_cmd == MMC_PACKED_WR_HDR)) {
> u32 status;
> do {
> int err = get_card_status(card, &status, 5);
> @@ -980,12 +988,67 @@ static int mmc_blk_err_check(struct mmc_card *card,
> if (!brq->data.bytes_xfered)
> return MMC_BLK_RETRY;
>
> + if (mq_mrq->packed_cmd != MMC_PACKED_NONE) {
> + if (unlikely(brq->data.blocks << 9 != brq->data.bytes_xfered))
> + return MMC_BLK_PARTIAL;
> + else
> + return MMC_BLK_SUCCESS;
> + }
> +
> if (blk_rq_bytes(req) != brq->data.bytes_xfered)
> return MMC_BLK_PARTIAL;
>
> return MMC_BLK_SUCCESS;
> }
>
> +static int mmc_blk_packed_err_check(struct mmc_card *card,
> + struct mmc_async_req *areq)
> +{
> + struct mmc_queue_req *mq_mrq = container_of(areq, struct mmc_queue_req,
> + mmc_active);
> + int err, check, status;
> + u8 ext_csd[512];
> +
> + check = mmc_blk_err_check(card, areq);
> +
> + if (check == MMC_BLK_SUCCESS)
> + return check;
> +
> + if (check == MMC_BLK_PARTIAL) {
> + err = get_card_status(card, &status, 0);
> + if (err)
> + return MMC_BLK_ABORT;
> +
> + if (status & R1_EXP_EVENT) {
> + err = mmc_send_ext_csd(card, ext_csd);
> + if (err)
> + return MMC_BLK_ABORT;
> +
> + if ((ext_csd[EXT_CSD_EXP_EVENTS_STATUS + 0] &
> + EXT_CSD_PACKED_FAILURE) &&
> + (ext_csd[EXT_CSD_PACKED_CMD_STATUS] &
> + EXT_CSD_PACKED_GENERIC_ERROR)) {
> + if (ext_csd[EXT_CSD_PACKED_CMD_STATUS] &
> + EXT_CSD_PACKED_INDEXED_ERROR) {
> + /* Make be 0-based */
> + mq_mrq->packed_fail_idx =
> + ext_csd[EXT_CSD_PACKED_FAILURE_INDEX] - 1;
> + return MMC_BLK_PARTIAL;
> + } else {
> + return MMC_BLK_RETRY;
> + }
> + }
> + } else {
> + return MMC_BLK_RETRY;
> + }
> + }
> +
> + if (check != MMC_BLK_ABORT)
> + return MMC_BLK_RETRY;
> + else
> + return MMC_BLK_ABORT;
> +}
> +
> static void mmc_blk_rw_rq_prep(struct mmc_queue_req *mqrq,
> struct mmc_card *card,
> int disable_multi,
> @@ -1129,6 +1192,211 @@ static void mmc_blk_rw_rq_prep(struct mmc_queue_req *mqrq,
> mmc_queue_bounce_pre(mqrq);
> }
>
> +static u8 mmc_blk_chk_packable(struct mmc_queue *mq, struct request *req)
> +{
> + struct request_queue *q = mq->queue;
> + struct mmc_card *card = mq->card;
> + struct request *cur = req, *next = NULL;
> + struct mmc_blk_data *md = mq->data;
> + bool en_rel_wr = card->ext_csd.rel_param & EXT_CSD_WR_REL_PARAM_EN;
> + unsigned int req_sectors = 0, phys_segments = 0;
> + unsigned int max_blk_count, max_phys_segs;
> + u8 max_packed_rw = 0;
> + u8 reqs = 0;
> +
> + if (!(md->flags & MMC_BLK_CMD23) &&
> + !card->ext_csd.packed_event_en)
> + goto no_packed;
> +
> + if (rq_data_dir(cur) == READ)
> + max_packed_rw = card->ext_csd.max_packed_reads;
> + else
> + max_packed_rw = card->ext_csd.max_packed_writes;
> +
> + if (max_packed_rw == 0)
> + goto no_packed;
> +
> + if (mmc_req_rel_wr(cur) &&
> + (md->flags & MMC_BLK_REL_WR) &&
> + !en_rel_wr) {
> + goto no_packed;
> + }
> +
> + max_blk_count = min(card->host->max_blk_count,
> + card->host->max_req_size >> 9);
> + if (unlikely(max_blk_count > 0xffff))
> + max_blk_count = 0xffff;
> +
> + max_phys_segs = queue_max_segments(q);
> + req_sectors += blk_rq_sectors(cur);
> + phys_segments += req->nr_phys_segments;
> +
> + if (rq_data_dir(cur) == WRITE) {
> + req_sectors++;
> + phys_segments++;
> + }
> +
> + while (reqs < max_packed_rw - 1) {
> + next = blk_fetch_request(q);
> + if (!next)
> + break;
> +
> + if (rq_data_dir(cur) != rq_data_dir(next)) {
> + blk_requeue_request(q, next);
> + break;
> + }
> +
> + if (mmc_req_rel_wr(next) &&
> + (md->flags & MMC_BLK_REL_WR) &&
> + !en_rel_wr) {
> + blk_requeue_request(q, next);
> + break;
> + }
> +
> + req_sectors += blk_rq_sectors(next);
> + if (req_sectors > max_blk_count) {
> + blk_requeue_request(q, next);
> + break;
> + }
> +
> + phys_segments += next->nr_phys_segments;
> + if (phys_segments > max_phys_segs) {
> + blk_requeue_request(q, next);
> + break;
> + }
> +
> + list_add_tail(&next->queuelist, &mq->mqrq_cur->packed_list);
> + cur = next;
> + reqs++;
> + }
> +
> + if (reqs > 0) {
> + list_add(&req->queuelist, &mq->mqrq_cur->packed_list);
> + return (reqs + 1);
> + }
> +
> +no_packed:
> + mq->mqrq_cur->packed_cmd = MMC_PACKED_NONE;
> + return reqs;
> +}
> +
> +static void mmc_blk_packed_hdr_wrq_prep(struct mmc_queue_req *mqrq,
> + struct mmc_card *card,
> + struct mmc_queue *mq,
> + u8 reqs)
> +{
> + struct mmc_blk_request *brq = &mqrq->brq;
> + struct request *req = mqrq->req;
> + struct request *prq;
> + struct mmc_blk_data *md = mq->data;
> + bool do_rel_wr;
> + u32 *packed_cmd_hdr = mqrq->packed_cmd_hdr;
> + u8 i =1;
> +
> + mqrq->packed_cmd = (rq_data_dir(req) == READ) ?
> + MMC_PACKED_WR_HDR : MMC_PACKED_WRITE;
> + mqrq->packed_blocks = 0;
> + mqrq->packed_fail_idx = -1;
> +
> + memset(packed_cmd_hdr, 0, sizeof(mqrq->packed_cmd_hdr));
> + packed_cmd_hdr[0] = (reqs << 16) |
> + (((rq_data_dir(req) == READ) ? PACKED_CMD_RD: PACKED_CMD_WR) << 8) |
> + PACKED_CMD_VER;
> +
> + /*
> + * Argument for each entry of packed group
> + */
> + list_for_each_entry(prq, &mqrq->packed_list, queuelist) {
> + do_rel_wr = mmc_req_rel_wr(prq) && (md->flags & MMC_BLK_REL_WR);
> + /* Argument of CMD23*/
> + packed_cmd_hdr[(i * 2)] = (do_rel_wr ? MMC_CMD23_ARG_REL_WR : 0) |
> + blk_rq_sectors(prq);
> + /* Argument of CMD18 or CMD25 */
> + packed_cmd_hdr[((i * 2)) + 1] = mmc_card_blockaddr(card) ?
> + blk_rq_pos(prq) : blk_rq_pos(prq) << 9;
> + mqrq->packed_blocks += blk_rq_sectors(prq);
> + i++;
> + }
> +
> + memset(brq, 0, sizeof(struct mmc_blk_request));
> + brq->mrq.cmd = &brq->cmd;
> + brq->mrq.data = &brq->data;
> + brq->mrq.sbc = &brq->sbc;
> + brq->mrq.stop = &brq->stop;
> +
> + brq->sbc.opcode = MMC_SET_BLOCK_COUNT;
> + brq->sbc.arg = MMC_CMD23_ARG_PACKED |
> + ((rq_data_dir(req) == READ) ? 1 : mqrq->packed_blocks + 1);
> + brq->sbc.flags = MMC_RSP_R1 | MMC_CMD_AC;
> +
> + brq->cmd.opcode = MMC_WRITE_MULTIPLE_BLOCK;
> + brq->cmd.arg = blk_rq_pos(req);
> + if (!mmc_card_blockaddr(card))
> + brq->cmd.arg <<= 9;
> + brq->cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_ADTC;
> +
> + brq->data.blksz = 512;
> + /*
> + * Write separately the packd command header only for packed read.
> + * In case of packed write, header is sent with blocks of data.
> + */
> + brq->data.blocks = (rq_data_dir(req) == READ) ?
> + 1 : mqrq->packed_blocks + 1;
> + brq->data.flags |= MMC_DATA_WRITE;
> +
> + brq->stop.opcode = MMC_STOP_TRANSMISSION;
> + brq->stop.arg = 0;
> + brq->stop.flags = MMC_RSP_SPI_R1B | MMC_RSP_R1B | MMC_CMD_AC;
> +
> + mmc_set_data_timeout(&brq->data, card);
> +
> + brq->data.sg = mqrq->sg;
> + brq->data.sg_len = mmc_queue_map_sg(mq, mqrq);
> +
> + mqrq->mmc_active.mrq = &brq->mrq;
> + mqrq->mmc_active.err_check = mmc_blk_packed_err_check;
> +
> + mmc_queue_bounce_pre(mqrq);
> +}
> +
> +static void mmc_blk_packed_rrq_prep(struct mmc_queue_req *mqrq,
> + struct mmc_card *card,
> + struct mmc_queue *mq)
> +{
> + struct mmc_blk_request *brq = &mqrq->brq;
> + struct request *req = mqrq->req;
> +
> + mqrq->packed_cmd = MMC_PACKED_READ;
> +
> + memset(brq, 0, sizeof(struct mmc_blk_request));
> + brq->mrq.cmd = &brq->cmd;
> + brq->mrq.data = &brq->data;
> + brq->mrq.stop = &brq->stop;
> +
> + brq->cmd.opcode = MMC_READ_MULTIPLE_BLOCK;
> + brq->cmd.arg = blk_rq_pos(req);
> + if (!mmc_card_blockaddr(card))
> + brq->cmd.arg <<= 9;
> + brq->cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_ADTC;
> + brq->data.blksz = 512;
> + brq->data.blocks = mqrq->packed_blocks;
> + brq->data.flags |= MMC_DATA_READ;
> +
> + brq->stop.opcode = MMC_STOP_TRANSMISSION;
> + brq->stop.arg = 0;
> + brq->stop.flags = MMC_RSP_SPI_R1B | MMC_RSP_R1B | MMC_CMD_AC;
> +
> + mmc_set_data_timeout(&brq->data, card);
> +
> + brq->data.sg = mqrq->sg;
> + brq->data.sg_len = mmc_queue_map_sg(mq, mqrq);
> +
> + mqrq->mmc_active.mrq = &brq->mrq;
> + mqrq->mmc_active.err_check = mmc_blk_packed_err_check;
> +
> + mmc_queue_bounce_pre(mqrq);
> +}
> +
> static int mmc_blk_cmd_err(struct mmc_blk_data *md, struct mmc_card *card,
> struct mmc_blk_request *brq, struct request *req,
> int ret)
> @@ -1166,15 +1434,33 @@ static int mmc_blk_issue_rw_rq(struct mmc_queue *mq, struct request *rqc)
> int ret = 1, disable_multi = 0, retry = 0, type;
> enum mmc_blk_status status;
> struct mmc_queue_req *mq_rq;
> - struct request *req;
> + struct request *req, *prq;
> struct mmc_async_req *areq;
> + u8 reqs = 0;
>
> if (!rqc && !mq->mqrq_prev->req)
> return 0;
>
> + if (rqc)
> + reqs = mmc_blk_chk_packable(mq, rqc);
> +
> do {
> if (rqc) {
> - mmc_blk_rw_rq_prep(mq->mqrq_cur, card, 0, mq);
> + if (reqs >= 2) {
> + mmc_blk_packed_hdr_wrq_prep(mq->mqrq_cur, card, mq, reqs);
> + if (rq_data_dir(rqc) == READ) {
> + areq = &mq->mqrq_cur->mmc_active;
> + mmc_wait_for_req(card->host, areq->mrq);
> + status = mmc_blk_packed_err_check(card, areq);
> + if (status == MMC_BLK_SUCCESS) {
> + mmc_blk_packed_rrq_prep(mq->mqrq_cur, card, mq);
> + } else {
> + goto check_status;
> + }
> + }
> + } else {
> + mmc_blk_rw_rq_prep(mq->mqrq_cur, card, 0, mq);
> + }
> areq = &mq->mqrq_cur->mmc_active;
> } else
> areq = NULL;
> @@ -1182,6 +1468,7 @@ static int mmc_blk_issue_rw_rq(struct mmc_queue *mq, struct request *rqc)
> if (!areq)
> return 0;
>
> +check_status:
> mq_rq = container_of(areq, struct mmc_queue_req, mmc_active);
> brq = &mq_rq->brq;
> req = mq_rq->req;
> @@ -1195,10 +1482,32 @@ static int mmc_blk_issue_rw_rq(struct mmc_queue *mq, struct request *rqc)
> * A block was successfully transferred.
> */
> mmc_blk_reset_success(md, type);
> - spin_lock_irq(&md->lock);
> - ret = __blk_end_request(req, 0,
> +
> + if (mq_rq->packed_cmd != MMC_PACKED_NONE) {
> + int idx = mq_rq->packed_fail_idx, i = 0;
> + while (!list_empty(&mq_rq->packed_list)) {
> + prq = list_entry_rq(mq_rq->packed_list.next);
> + if (idx == i) {
> + /* retry from error index */
> + reqs -= idx;
> + mq_rq->req = prq;
> + ret = 1;
> + break;
> + }
> + list_del_init(&prq->queuelist);
> + spin_lock_irq(&md->lock);
> + ret = __blk_end_request(prq, 0, blk_rq_bytes(prq));
> + spin_unlock_irq(&md->lock);
> + i++;
> + }
> + break;
> + } else {
> + spin_lock_irq(&md->lock);
> + ret = __blk_end_request(req, 0,
> brq->data.bytes_xfered);
> - spin_unlock_irq(&md->lock);
> + spin_unlock_irq(&md->lock);
> + }
> +
> /*
> * If the blk_end_request function returns non-zero even
> * though all data has been transferred and no errors
> @@ -1257,7 +1566,7 @@ static int mmc_blk_issue_rw_rq(struct mmc_queue *mq, struct request *rqc)
> break;
> }
>
> - if (ret) {
> + if (ret && (mq_rq->packed_cmd == MMC_PACKED_NONE)) {
> /*
> * In case of a incomplete request
> * prepare it again and resend.
> @@ -1270,13 +1579,37 @@ static int mmc_blk_issue_rw_rq(struct mmc_queue *mq, struct request *rqc)
> return 1;
>
> cmd_abort:
> - spin_lock_irq(&md->lock);
> - while (ret)
> - ret = __blk_end_request(req, -EIO, blk_rq_cur_bytes(req));
> - spin_unlock_irq(&md->lock);
> + if (mq_rq->packed_cmd != MMC_PACKED_NONE) {
> + spin_lock_irq(&md->lock);
> + while (ret)
> + ret = __blk_end_request(req, -EIO, blk_rq_cur_bytes(req));
> + spin_unlock_irq(&md->lock);
> + } else {
> + while (!list_empty(&mq_rq->packed_list)) {
> + prq = list_entry_rq(mq_rq->packed_list.next);
> + list_del_init(&prq->queuelist);
> + spin_lock_irq(&md->lock);
> + __blk_end_request(prq, -EIO, blk_rq_bytes(prq));
> + spin_unlock_irq(&md->lock);
> + }
> + }
>
> start_new_req:
> if (rqc) {
> + /*
> + * If current request is packed, it need to put back.
> + */
> + if (mq->mqrq_cur->packed_cmd != MMC_PACKED_NONE) {
> + while (!list_empty(&mq->mqrq_cur->packed_list)) {
> + prq = list_entry_rq(mq->mqrq_cur->packed_list.prev);
> + if (prq->queuelist.prev != &mq->mqrq_cur->packed_list) {
> + list_del_init(&prq->queuelist);
> + blk_requeue_request(mq->queue, prq);
> + } else {
> + list_del_init(&prq->queuelist);
> + }
> + }
> + }
> mmc_blk_rw_rq_prep(mq->mqrq_cur, card, 0, mq);
> mmc_start_req(card->host, &mq->mqrq_cur->mmc_active, NULL);
> }
> diff --git a/drivers/mmc/card/queue.c b/drivers/mmc/card/queue.c
> index dcad59c..3a4542e 100644
> --- a/drivers/mmc/card/queue.c
> +++ b/drivers/mmc/card/queue.c
> @@ -172,6 +172,8 @@ int mmc_init_queue(struct mmc_queue *mq, struct mmc_card *card,
>
> memset(&mq->mqrq_cur, 0, sizeof(mq->mqrq_cur));
> memset(&mq->mqrq_prev, 0, sizeof(mq->mqrq_prev));
> + INIT_LIST_HEAD(&mqrq_cur->packed_list);
> + INIT_LIST_HEAD(&mqrq_prev->packed_list);
> mq->mqrq_cur = mqrq_cur;
> mq->mqrq_prev = mqrq_prev;
> mq->queue->queuedata = mq;
> @@ -372,6 +374,39 @@ void mmc_queue_resume(struct mmc_queue *mq)
> }
> }
>
> +static unsigned int mmc_queue_packed_map_sg(struct mmc_queue *mq,
> + struct mmc_queue_req *mqrq,
> + struct scatterlist *sg)
> +{
> + struct scatterlist *__sg;
> + unsigned int sg_len = 0;
> + struct request *req;
> + enum mmc_packed_cmd cmd;
> +
> + cmd = mqrq->packed_cmd;
> +
> + if (cmd == MMC_PACKED_WR_HDR || cmd == MMC_PACKED_WRITE) {
> + __sg =sg;
> + sg_set_buf(__sg, mqrq->packed_cmd_hdr,
> + sizeof(mqrq->packed_cmd_hdr));
> + sg_len++;
> + if (cmd == MMC_PACKED_WR_HDR) {
> + sg_mark_end(__sg);
> + return sg_len;
> + }
> + __sg->page_link &= ~0x02;
> + }
> +
> + __sg = sg + sg_len;
> + list_for_each_entry(req, &mqrq->packed_list, queuelist) {
> + sg_len += blk_rq_map_sg(mq->queue, req, __sg);
> + __sg = sg + (sg_len - 1);
> + (__sg++)->page_link &= ~0x02;
> + }
> + sg_mark_end(sg + (sg_len - 1));
> + return sg_len;
> +}
> +
> /*
> * Prepare the sg list(s) to be handed of to the host driver
> */
> @@ -382,12 +417,19 @@ unsigned int mmc_queue_map_sg(struct mmc_queue *mq, struct mmc_queue_req *mqrq)
> struct scatterlist *sg;
> int i;
>
> - if (!mqrq->bounce_buf)
> - return blk_rq_map_sg(mq->queue, mqrq->req, mqrq->sg);
> + if (!mqrq->bounce_buf) {
> + if (!list_empty(&mqrq->packed_list))
> + return mmc_queue_packed_map_sg(mq, mqrq, mqrq->sg);
> + else
> + return blk_rq_map_sg(mq->queue, mqrq->req, mqrq->sg);
> + }
>
> BUG_ON(!mqrq->bounce_sg);
>
> - sg_len = blk_rq_map_sg(mq->queue, mqrq->req, mqrq->bounce_sg);
> + if (!list_empty(&mqrq->packed_list))
> + sg_len = mmc_queue_packed_map_sg(mq, mqrq, mqrq->bounce_sg);
> + else
> + sg_len = blk_rq_map_sg(mq->queue, mqrq->req, mqrq->bounce_sg);
>
> mqrq->bounce_sg_len = sg_len;
>
> diff --git a/drivers/mmc/card/queue.h b/drivers/mmc/card/queue.h
> index d2a1eb4..5d0131e 100644
> --- a/drivers/mmc/card/queue.h
> +++ b/drivers/mmc/card/queue.h
> @@ -12,6 +12,13 @@ struct mmc_blk_request {
> struct mmc_data data;
> };
>
> +enum mmc_packed_cmd {
> + MMC_PACKED_NONE = 0,
> + MMC_PACKED_WR_HDR,
> + MMC_PACKED_WRITE,
> + MMC_PACKED_READ,
> +};
> +
> struct mmc_queue_req {
> struct request *req;
> struct mmc_blk_request brq;
> @@ -20,6 +27,11 @@ struct mmc_queue_req {
> struct scatterlist *bounce_sg;
> unsigned int bounce_sg_len;
> struct mmc_async_req mmc_active;
> + struct list_head packed_list;
> + u32 packed_cmd_hdr[128];
> + unsigned int packed_blocks;
> + enum mmc_packed_cmd packed_cmd;
> + int packed_fail_idx;
> };
>
> struct mmc_queue {
> diff --git a/include/linux/mmc/core.h b/include/linux/mmc/core.h
> index 174a844..3c61d5a 100644
> --- a/include/linux/mmc/core.h
> +++ b/include/linux/mmc/core.h
> @@ -18,6 +18,8 @@ struct mmc_request;
> struct mmc_command {
> u32 opcode;
> u32 arg;
> +#define MMC_CMD23_ARG_REL_WR (1 << 31)
> +#define MMC_CMD23_ARG_PACKED ((0 << 31) | (1 << 30))
> u32 resp[4];
> unsigned int flags; /* expected response type */
> #define MMC_RSP_PRESENT (1 << 0)
> @@ -143,6 +145,7 @@ extern int mmc_app_cmd(struct mmc_host *, struct mmc_card *);
> extern int mmc_wait_for_app_cmd(struct mmc_host *, struct mmc_card *,
> struct mmc_command *, int);
> extern int mmc_switch(struct mmc_card *, u8, u8, u8, unsigned int);
> +extern int mmc_send_ext_csd(struct mmc_card *card, u8 *ext_csd);
>
> #define MMC_ERASE_ARG 0x00000000
> #define MMC_SECURE_ERASE_ARG 0x80000000
> --
> 1.7.0.4
> Even i just had a chance to run checkpatch. has some warnings and error
> --
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