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Message-id: <009f01cd3411$513ddeb0$f3b99c10$%jun@samsung.com>
Date: Thu, 17 May 2012 18:42:04 +0900
From: Seungwon Jeon <tgih.jun@...sung.com>
To: linux-mmc@...r.kernel.org
Cc: 'Chris Ball' <cjb@...top.org>, merez@...eaurora.org,
linux-kernel@...r.kernel.org
Subject: [PATCH v6 3/3] mmc: core: Support packed read command for eMMC4.5
device
Add the packed read command for issuing data. Unlike the
packed write, command header is handled separately.
Signed-off-by: Seungwon Jeon <tgih.jun@...sung.com>
---
drivers/mmc/card/block.c | 134 +++++++++++++++++++++++++++++++++++++++++++---
drivers/mmc/card/queue.c | 6 ++-
drivers/mmc/card/queue.h | 2 +
3 files changed, 133 insertions(+), 9 deletions(-)
diff --git a/drivers/mmc/card/block.c b/drivers/mmc/card/block.c
index 8f475b1..93ea82e 100644
--- a/drivers/mmc/card/block.c
+++ b/drivers/mmc/card/block.c
@@ -62,6 +62,7 @@ MODULE_ALIAS("mmc:block");
(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);
@@ -104,6 +105,7 @@ struct mmc_blk_data {
#define MMC_BLK_WRITE BIT(1)
#define MMC_BLK_DISCARD BIT(2)
#define MMC_BLK_SECDISCARD BIT(3)
+#define MMC_BLK_WR_HDR BIT(4)
/*
* Only set in main mmc_blk_data associated
@@ -1068,7 +1070,8 @@ 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);
@@ -1093,7 +1096,8 @@ static int mmc_blk_err_check(struct mmc_card *card,
(unsigned)blk_rq_sectors(req),
brq->cmd.resp[0], brq->stop.resp[0]);
- if (rq_data_dir(req) == READ) {
+ if (rq_data_dir(req) == READ &&
+ mq_mrq->packed_cmd != MMC_PACKED_WR_HDR) {
if (ecc_err)
return MMC_BLK_ECC_ERR;
return MMC_BLK_DATA_ERR;
@@ -1335,6 +1339,10 @@ static u8 mmc_blk_prep_packed_list(struct mmc_queue *mq, struct request *req)
if ((rq_data_dir(cur) == WRITE) &&
(card->host->caps2 & MMC_CAP2_PACKED_WR))
max_packed_rw = card->ext_csd.max_packed_writes;
+ else if ((rq_data_dir(cur) == READ) &&
+ (card->host->caps2 & MMC_CAP2_PACKED_RD))
+ max_packed_rw = card->ext_csd.max_packed_reads;
+
if (max_packed_rw == 0)
goto no_packed;
@@ -1430,13 +1438,16 @@ static void mmc_blk_packed_hdr_wrq_prep(struct mmc_queue_req *mqrq,
u32 *packed_cmd_hdr = mqrq->packed_cmd_hdr;
u8 i = 1;
- mqrq->packed_cmd = MMC_PACKED_WRITE;
+ mqrq->packed_cmd = (rq_data_dir(req) == READ) ?
+ MMC_PACKED_WR_HDR : 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;
+ (((rq_data_dir(req) == READ) ?
+ PACKED_CMD_RD : PACKED_CMD_WR) << 8) |
+ PACKED_CMD_VER;
/*
* Argument for each entry of packed group
@@ -1468,7 +1479,8 @@ static void mmc_blk_packed_hdr_wrq_prep(struct mmc_queue_req *mqrq,
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.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;
@@ -1478,7 +1490,12 @@ static void mmc_blk_packed_hdr_wrq_prep(struct mmc_queue_req *mqrq,
brq->cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_ADTC;
brq->data.blksz = 512;
- brq->data.blocks = mqrq->packed_blocks + 1;
+ /*
+ * 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;
@@ -1496,6 +1513,44 @@ static void mmc_blk_packed_hdr_wrq_prep(struct mmc_queue_req *mqrq,
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)
@@ -1530,6 +1585,56 @@ static int mmc_blk_cmd_err(struct mmc_blk_data *md, struct mmc_card *card,
return ret;
}
+static int mmc_blk_chk_hdr_err(struct mmc_queue *mq, int status)
+{
+ struct mmc_blk_data *md = mq->data;
+ struct mmc_card *card = md->queue.card;
+ int type = MMC_BLK_WR_HDR, err = 0;
+
+ switch (status) {
+ case MMC_BLK_PARTIAL:
+ case MMC_BLK_RETRY:
+ err = 0;
+ break;
+ case MMC_BLK_CMD_ERR:
+ case MMC_BLK_ABORT:
+ case MMC_BLK_DATA_ERR:
+ case MMC_BLK_ECC_ERR:
+ err = mmc_blk_reset(md, card->host, type);
+ if (!err)
+ mmc_blk_reset_success(md, type);
+ break;
+ }
+
+ return err;
+}
+
+static int mmc_blk_issue_packed_rd(struct mmc_queue *mq,
+ struct mmc_queue_req *mq_rq)
+{
+ struct mmc_blk_data *md = mq->data;
+ struct mmc_card *card = md->queue.card;
+ int status, ret, retry = 2;
+
+ do {
+ mmc_start_req(card->host, NULL, (int *) &status);
+ if (status) {
+ ret = mmc_blk_chk_hdr_err(mq, status);
+ if (ret)
+ break;
+ mmc_blk_packed_hdr_wrq_prep(mq_rq, card, mq);
+ mmc_start_req(card->host, &mq_rq->mmc_active, NULL);
+ } else {
+ mmc_blk_packed_rrq_prep(mq_rq, card, mq);
+ mmc_start_req(card->host, &mq_rq->mmc_active, NULL);
+ ret = 0;
+ break;
+ }
+ } while (retry-- > 0);
+
+ return ret;
+}
+
static int mmc_blk_end_packed_req(struct mmc_queue *mq,
struct mmc_queue_req *mq_rq)
{
@@ -1593,8 +1698,12 @@ static int mmc_blk_issue_rw_rq(struct mmc_queue *mq, struct request *rqc)
} else
areq = NULL;
areq = mmc_start_req(card->host, areq, (int *) &status);
- if (!areq)
- return 0;
+ if (!areq) {
+ if (mq->mqrq_cur->packed_cmd == MMC_PACKED_WR_HDR)
+ goto snd_packed_rd;
+ else
+ return 0;
+ }
mq_rq = container_of(areq, struct mmc_queue_req, mmc_active);
brq = &mq_rq->brq;
@@ -1695,10 +1804,19 @@ static int mmc_blk_issue_rw_rq(struct mmc_queue *mq, struct request *rqc)
mmc_blk_packed_hdr_wrq_prep(mq_rq, card, mq);
mmc_start_req(card->host,
&mq_rq->mmc_active, NULL);
+ if (mq_rq->packed_cmd == MMC_PACKED_WR_HDR) {
+ if (mmc_blk_issue_packed_rd(mq, mq_rq))
+ goto cmd_abort;
+ }
}
}
} while (ret);
+snd_packed_rd:
+ if (mq->mqrq_cur->packed_cmd == MMC_PACKED_WR_HDR) {
+ if (mmc_blk_issue_packed_rd(mq, mq->mqrq_cur))
+ goto start_new_req;
+ }
return 1;
cmd_abort:
diff --git a/drivers/mmc/card/queue.c b/drivers/mmc/card/queue.c
index 165d85a..277905e 100644
--- a/drivers/mmc/card/queue.c
+++ b/drivers/mmc/card/queue.c
@@ -389,11 +389,15 @@ static unsigned int mmc_queue_packed_map_sg(struct mmc_queue *mq,
cmd = mqrq->packed_cmd;
- if (cmd == MMC_PACKED_WRITE) {
+ 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;
}
diff --git a/drivers/mmc/card/queue.h b/drivers/mmc/card/queue.h
index d761bf1..be58b3c 100644
--- a/drivers/mmc/card/queue.h
+++ b/drivers/mmc/card/queue.h
@@ -14,7 +14,9 @@ struct mmc_blk_request {
enum mmc_packed_cmd {
MMC_PACKED_NONE = 0,
+ MMC_PACKED_WR_HDR,
MMC_PACKED_WRITE,
+ MMC_PACKED_READ,
};
struct mmc_queue_req {
--
1.7.0.4
--
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