mmc: support packed write command for eMMC4.5 device
This patch supports packed write command of eMMC4.5 device.
Several writes can be grouped in packed command and all data
of the individual commands can be sent in a single transfer
on the bus.
[tlinder@codeaurora.org: Difference in definition:
R1_EXP_EVENT -- > R1_EXCEPTION_EVENT]
(cherry picked from commit 53f8f574c6c68687098cd064af8224da44de2484)
Change-Id: I26ee7c0b957a3aec5e4ffc6d6df806ea38435784
Signed-off-by: Seungwon Jeon <tgih.jun@samsung.com>
Reviewed-by: Maya Erez <merez@codeaurora.org>
Reviewed-by: Namjae Jeon <linkinjeon@gmail.com>
Signed-off-by: Tatyana Brokhman <tlinder@codeaurora.org>
(cherry picked from commit 6d24bc3b6e86412cbfbc37377bbbf196cbdebce9)
diff --git a/drivers/mmc/card/block.c b/drivers/mmc/card/block.c
index 63d2fa1..a9f1b53 100644
--- a/drivers/mmc/card/block.c
+++ b/drivers/mmc/card/block.c
@@ -60,6 +60,12 @@
#define MMC_SANITIZE_REQ_TIMEOUT 240000 /* msec */
+#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_WR 0x02
+
static DEFINE_MUTEX(block_mutex);
/*
@@ -125,9 +131,21 @@
MMC_BLK_NOMEDIUM,
};
+enum {
+ MMC_PACKED_N_IDX = -1,
+ MMC_PACKED_N_ZERO,
+ MMC_PACKED_N_SINGLE,
+};
+
module_param(perdev_minors, int, 0444);
MODULE_PARM_DESC(perdev_minors, "Minors numbers to allocate per device");
+static inline void mmc_blk_clear_packed(struct mmc_queue_req *mqrq)
+{
+ mqrq->packed_cmd = MMC_PACKED_NONE;
+ mqrq->packed_num = MMC_PACKED_N_ZERO;
+}
+
static struct mmc_blk_data *mmc_blk_get(struct gendisk *disk)
{
struct mmc_blk_data *md;
@@ -1096,12 +1114,61 @@
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_rq = container_of(areq, struct mmc_queue_req,
+ mmc_active);
+ struct request *req = mq_rq->req;
+ int err, check, status;
+ u8 ext_csd[512];
+
+ mq_rq->packed_retries--;
+ check = mmc_blk_err_check(card, areq);
+ err = get_card_status(card, &status, 0);
+ if (err) {
+ pr_err("%s: error %d sending status command\n",
+ req->rq_disk->disk_name, err);
+ return MMC_BLK_ABORT;
+ }
+
+ if (status & R1_EXCEPTION_EVENT) {
+ err = mmc_send_ext_csd(card, ext_csd);
+ if (err) {
+ pr_err("%s: error %d sending ext_csd\n",
+ req->rq_disk->disk_name, err);
+ return MMC_BLK_ABORT;
+ }
+
+ if ((ext_csd[EXT_CSD_EXP_EVENTS_STATUS] &
+ 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) {
+ mq_rq->packed_fail_idx =
+ ext_csd[EXT_CSD_PACKED_FAILURE_INDEX] - 1;
+ return MMC_BLK_PARTIAL;
+ }
+ }
+ }
+
+ return check;
+}
+
static void mmc_blk_rw_rq_prep(struct mmc_queue_req *mqrq,
struct mmc_card *card,
int disable_multi,
@@ -1257,10 +1324,206 @@
mmc_queue_bounce_pre(mqrq);
}
+static u8 mmc_blk_prep_packed_list(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 put_back = 0;
+ u8 max_packed_rw = 0;
+ u8 reqs = 0;
+
+ mmc_blk_clear_packed(mq->mqrq_cur);
+
+ if (!(md->flags & MMC_BLK_CMD23) ||
+ !card->ext_csd.packed_event_en)
+ goto no_packed;
+
+ if ((rq_data_dir(cur) == WRITE) &&
+ (card->host->caps2 & MMC_CAP2_PACKED_WR))
+ 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;
+
+ if (mmc_large_sec(card) &&
+ !IS_ALIGNED(blk_rq_sectors(cur), 8))
+ 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 += cur->nr_phys_segments;
+
+ if (rq_data_dir(cur) == WRITE) {
+ req_sectors++;
+ phys_segments++;
+ }
+
+ while (reqs < max_packed_rw - 1) {
+ spin_lock_irq(q->queue_lock);
+ next = blk_fetch_request(q);
+ spin_unlock_irq(q->queue_lock);
+ if (!next)
+ break;
+
+ if (mmc_large_sec(card) &&
+ !IS_ALIGNED(blk_rq_sectors(next), 8)) {
+ put_back = 1;
+ break;
+ }
+
+ if (next->cmd_flags & REQ_DISCARD ||
+ next->cmd_flags & REQ_FLUSH) {
+ put_back = 1;
+ break;
+ }
+
+ if (rq_data_dir(cur) != rq_data_dir(next)) {
+ put_back = 1;
+ break;
+ }
+
+ if (mmc_req_rel_wr(next) &&
+ (md->flags & MMC_BLK_REL_WR) &&
+ !en_rel_wr) {
+ put_back = 1;
+ break;
+ }
+
+ req_sectors += blk_rq_sectors(next);
+ if (req_sectors > max_blk_count) {
+ put_back = 1;
+ break;
+ }
+
+ phys_segments += next->nr_phys_segments;
+ if (phys_segments > max_phys_segs) {
+ put_back = 1;
+ break;
+ }
+
+ list_add_tail(&next->queuelist, &mq->mqrq_cur->packed_list);
+ cur = next;
+ reqs++;
+ }
+
+ if (put_back) {
+ spin_lock_irq(q->queue_lock);
+ blk_requeue_request(q, next);
+ spin_unlock_irq(q->queue_lock);
+ }
+
+ if (reqs > 0) {
+ list_add(&req->queuelist, &mq->mqrq_cur->packed_list);
+ mq->mqrq_cur->packed_num = ++reqs;
+ mq->mqrq_cur->packed_retries = reqs;
+ return reqs;
+ }
+
+no_packed:
+ mmc_blk_clear_packed(mq->mqrq_cur);
+ return 0;
+}
+
+static void mmc_blk_packed_hdr_wrq_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;
+ struct request *prq;
+ struct mmc_blk_data *md = mq->data;
+ bool do_rel_wr, do_data_tag;
+ u32 *packed_cmd_hdr = mqrq->packed_cmd_hdr;
+ u8 i = 1;
+
+ mqrq->packed_cmd = MMC_PACKED_WRITE;
+ mqrq->packed_blocks = 0;
+ mqrq->packed_fail_idx = MMC_PACKED_N_IDX;
+
+ memset(packed_cmd_hdr, 0, sizeof(mqrq->packed_cmd_hdr));
+ packed_cmd_hdr[0] = (mqrq->packed_num << 16) |
+ (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);
+ do_data_tag = (card->ext_csd.data_tag_unit_size) &&
+ (prq->cmd_flags & REQ_META) &&
+ (rq_data_dir(prq) == WRITE) &&
+ ((brq->data.blocks * brq->data.blksz) >=
+ card->ext_csd.data_tag_unit_size);
+ /* Argument of CMD23 */
+ packed_cmd_hdr[(i * 2)] =
+ (do_rel_wr ? MMC_CMD23_ARG_REL_WR : 0) |
+ (do_data_tag ? MMC_CMD23_ARG_TAG_REQ : 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 | (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;
+ brq->data.blocks = 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 int mmc_blk_cmd_err(struct mmc_blk_data *md, struct mmc_card *card,
struct mmc_blk_request *brq, struct request *req,
int ret)
{
+ struct mmc_queue_req *mq_rq;
+ mq_rq = container_of(brq, struct mmc_queue_req, brq);
+
/*
* If this is an SD card and we're writing, we can first
* mark the known good sectors as ok.
@@ -1277,11 +1540,75 @@
ret = blk_end_request(req, 0, blocks << 9);
} else
ret = blk_end_request(req, 0, brq->data.bytes_xfered);
- } else
- ret = blk_end_request(req, 0, brq->data.bytes_xfered);
+ } else {
+ if (mq_rq->packed_cmd == MMC_PACKED_NONE)
+ ret = blk_end_request(req, 0, brq->data.bytes_xfered);
+ }
return ret;
}
+static int mmc_blk_end_packed_req(struct mmc_queue_req *mq_rq)
+{
+ struct request *prq;
+ int idx = mq_rq->packed_fail_idx, i = 0;
+ int ret = 0;
+
+ while (!list_empty(&mq_rq->packed_list)) {
+ prq = list_entry_rq(mq_rq->packed_list.next);
+ if (idx == i) {
+ /* retry from error index */
+ mq_rq->packed_num -= idx;
+ mq_rq->req = prq;
+ ret = 1;
+
+ if (mq_rq->packed_num == MMC_PACKED_N_SINGLE) {
+ list_del_init(&prq->queuelist);
+ mmc_blk_clear_packed(mq_rq);
+ }
+ return ret;
+ }
+ list_del_init(&prq->queuelist);
+ blk_end_request(prq, 0, blk_rq_bytes(prq));
+ i++;
+ }
+
+ mmc_blk_clear_packed(mq_rq);
+ return ret;
+}
+static void mmc_blk_abort_packed_req(struct mmc_queue_req *mq_rq)
+{
+ struct request *prq;
+
+ while (!list_empty(&mq_rq->packed_list)) {
+ prq = list_entry_rq(mq_rq->packed_list.next);
+ list_del_init(&prq->queuelist);
+ blk_end_request(prq, -EIO, blk_rq_bytes(prq));
+ }
+
+ mmc_blk_clear_packed(mq_rq);
+}
+
+static void mmc_blk_revert_packed_req(struct mmc_queue *mq,
+ struct mmc_queue_req *mq_rq)
+{
+ struct request *prq;
+ struct request_queue *q = mq->queue;
+
+ while (!list_empty(&mq_rq->packed_list)) {
+ prq = list_entry_rq(mq_rq->packed_list.prev);
+ if (prq->queuelist.prev != &mq_rq->packed_list) {
+ list_del_init(&prq->queuelist);
+ spin_lock_irq(q->queue_lock);
+ blk_requeue_request(mq->queue, prq);
+ spin_unlock_irq(q->queue_lock);
+ } else {
+ list_del_init(&prq->queuelist);
+ }
+ }
+
+ mmc_blk_clear_packed(mq_rq);
+}
+
static int mmc_blk_issue_rw_rq(struct mmc_queue *mq, struct request *rqc)
{
struct mmc_blk_data *md = mq->data;
@@ -1292,13 +1619,22 @@
struct mmc_queue_req *mq_rq;
struct request *req;
struct mmc_async_req *areq;
+ const u8 packed_num = 2;
+ u8 reqs = 0;
if (!rqc && !mq->mqrq_prev->req)
return 0;
+ if (rqc)
+ reqs = mmc_blk_prep_packed_list(mq, rqc);
+
do {
if (rqc) {
- mmc_blk_rw_rq_prep(mq->mqrq_cur, card, 0, mq);
+ if (reqs >= packed_num)
+ mmc_blk_packed_hdr_wrq_prep(mq->mqrq_cur,
+ card, mq);
+ else
+ mmc_blk_rw_rq_prep(mq->mqrq_cur, card, 0, mq);
areq = &mq->mqrq_cur->mmc_active;
} else
areq = NULL;
@@ -1319,8 +1655,15 @@
* A block was successfully transferred.
*/
mmc_blk_reset_success(md, type);
- ret = blk_end_request(req, 0,
+
+ if (mq_rq->packed_cmd != MMC_PACKED_NONE) {
+ ret = mmc_blk_end_packed_req(mq_rq);
+ break;
+ } else {
+ ret = blk_end_request(req, 0,
brq->data.bytes_xfered);
+ }
+
/*
* If the blk_end_request function returns non-zero even
* though all data has been transferred and no errors
@@ -1353,7 +1696,8 @@
err = mmc_blk_reset(md, card->host, type);
if (!err)
break;
- if (err == -ENODEV)
+ if (err == -ENODEV ||
+ mq_rq->packed_cmd != MMC_PACKED_NONE)
goto cmd_abort;
/* Fall through */
}
@@ -1380,26 +1724,46 @@
}
if (ret) {
- /*
- * In case of a incomplete request
- * prepare it again and resend.
- */
- mmc_blk_rw_rq_prep(mq_rq, card, disable_multi, mq);
- mmc_start_req(card->host, &mq_rq->mmc_active, NULL);
+ if (mq_rq->packed_cmd == MMC_PACKED_NONE) {
+ /*
+ * In case of a incomplete request
+ * prepare it again and resend.
+ */
+ mmc_blk_rw_rq_prep(mq_rq, card,
+ disable_multi, mq);
+ mmc_start_req(card->host,
+ &mq_rq->mmc_active, NULL);
+ } else {
+ if (!mq_rq->packed_retries)
+ goto cmd_abort;
+ mmc_blk_packed_hdr_wrq_prep(mq_rq, card, mq);
+ mmc_start_req(card->host,
+ &mq_rq->mmc_active, NULL);
+ }
}
} while (ret);
return 1;
cmd_abort:
- if (mmc_card_removed(card))
- req->cmd_flags |= REQ_QUIET;
- while (ret)
- ret = blk_end_request(req, -EIO,
- blk_rq_cur_bytes(req));
+ if (mq_rq->packed_cmd == MMC_PACKED_NONE) {
+ if (mmc_card_removed(card))
+ req->cmd_flags |= REQ_QUIET;
+ while (ret)
+ ret = blk_end_request(req, -EIO,
+ blk_rq_cur_bytes(req));
+ } else {
+ mmc_blk_abort_packed_req(mq_rq);
+ }
start_new_req:
if (rqc) {
+ /*
+ * If current request is packed, it needs to put back.
+ */
+ if (mq->mqrq_cur->packed_cmd != MMC_PACKED_NONE)
+ mmc_blk_revert_packed_req(mq, mq->mqrq_cur);
+
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 9e9dfcd..d818fc4 100644
--- a/drivers/mmc/card/queue.c
+++ b/drivers/mmc/card/queue.c
@@ -181,6 +181,9 @@
if (!mq->queue)
return -ENOMEM;
+ INIT_LIST_HEAD(&mqrq_cur->packed_list);
+ INIT_LIST_HEAD(&mqrq_prev->packed_list);
+
memset(&mq->mqrq_cur, 0, sizeof(mq->mqrq_cur));
memset(&mq->mqrq_prev, 0, sizeof(mq->mqrq_prev));
mq->mqrq_cur = mqrq_cur;
@@ -386,6 +389,35 @@
}
}
+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_WRITE) {
+ __sg = sg;
+ sg_set_buf(__sg, mqrq->packed_cmd_hdr,
+ sizeof(mqrq->packed_cmd_hdr));
+ 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
*/
@@ -396,12 +428,19 @@
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..5e04938 100644
--- a/drivers/mmc/card/queue.h
+++ b/drivers/mmc/card/queue.h
@@ -12,6 +12,11 @@
struct mmc_data data;
};
+enum mmc_packed_cmd {
+ MMC_PACKED_NONE = 0,
+ MMC_PACKED_WRITE,
+};
+
struct mmc_queue_req {
struct request *req;
struct mmc_blk_request brq;
@@ -20,6 +25,13 @@
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_retries;
+ int packed_fail_idx;
+ u8 packed_num;
};
struct mmc_queue {
diff --git a/drivers/mmc/core/mmc_ops.c b/drivers/mmc/core/mmc_ops.c
index 2d282b5..4f46ed1 100644
--- a/drivers/mmc/core/mmc_ops.c
+++ b/drivers/mmc/core/mmc_ops.c
@@ -335,6 +335,7 @@
return mmc_send_cxd_data(card, card->host, MMC_SEND_EXT_CSD,
ext_csd, 512);
}
+EXPORT_SYMBOL_GPL(mmc_send_ext_csd);
int mmc_spi_read_ocr(struct mmc_host *host, int highcap, u32 *ocrp)
{
diff --git a/include/linux/mmc/card.h b/include/linux/mmc/card.h
index 8806e5d..0330dfb 100644
--- a/include/linux/mmc/card.h
+++ b/include/linux/mmc/card.h
@@ -300,6 +300,11 @@
card->nr_parts++;
}
+static inline bool mmc_large_sec(struct mmc_card *card)
+{
+ return card->ext_csd.data_sector_size == 4096;
+}
+
/*
* The world is not perfect and supplies us with broken mmc/sdio devices.
* For at least some of these bugs we need a work-around.
diff --git a/include/linux/mmc/core.h b/include/linux/mmc/core.h
index 7a45622..3f26a80 100644
--- a/include/linux/mmc/core.h
+++ b/include/linux/mmc/core.h
@@ -18,6 +18,9 @@
struct mmc_command {
u32 opcode;
u32 arg;
+#define MMC_CMD23_ARG_REL_WR (1 << 31)
+#define MMC_CMD23_ARG_PACKED ((0 << 31) | (1 << 30))
+#define MMC_CMD23_ARG_TAG_REQ (1 << 29)
u32 resp[4];
unsigned int flags; /* expected response type */
#define MMC_RSP_PRESENT (1 << 0)
@@ -148,6 +151,7 @@
extern void mmc_start_bkops(struct mmc_card *card, bool from_exception);
extern int __mmc_switch(struct mmc_card *, u8, u8, u8, unsigned int, bool);
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