mmc: block: add a block request prepare function
Break out code from mmc_blk_issue_rw_rq to create a block request prepare function. This doesn't change any functionallity. This helps when handling more than one active block request. Signed-off-by: Per Forlin <per.forlin@linaro.org> Acked-by: Kyungmin Park <kyungmin.park@samsung.com> Acked-by: Arnd Bergmann <arnd@arndb.de> Reviewed-by: Venkatraman S <svenkatr@ti.com> Tested-by: Sourav Poddar <sourav.poddar@ti.com> Tested-by: Linus Walleij <linus.walleij@linaro.org> Signed-off-by: Chris Ball <cjb@laptop.org>
This commit is contained in:
Per Forlin
Chris Ball
Родитель
97868a2bdf
Коммит
54d49d7762
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@ -812,12 +812,15 @@ static inline void mmc_apply_rel_rw(struct mmc_blk_request *brq,
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R1_CC_ERROR | /* Card controller error */ \
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R1_ERROR) /* General/unknown error */
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static int mmc_blk_issue_rw_rq(struct mmc_queue *mq, struct request *req)
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static void mmc_blk_rw_rq_prep(struct mmc_queue_req *mqrq,
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struct mmc_card *card,
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int disable_multi,
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struct mmc_queue *mq)
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{
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u32 readcmd, writecmd;
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struct mmc_blk_request *brq = &mqrq->brq;
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struct request *req = mqrq->req;
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struct mmc_blk_data *md = mq->data;
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struct mmc_card *card = md->queue.card;
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struct mmc_blk_request *brq = &mq->mqrq_cur->brq;
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int ret = 1, disable_multi = 0, retry = 0;
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/*
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* Reliable writes are used to implement Forced Unit Access and
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@ -828,119 +831,126 @@ static int mmc_blk_issue_rw_rq(struct mmc_queue *mq, struct request *req)
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(rq_data_dir(req) == WRITE) &&
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(md->flags & MMC_BLK_REL_WR);
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do {
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u32 readcmd, writecmd;
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memset(brq, 0, sizeof(struct mmc_blk_request));
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brq->mrq.cmd = &brq->cmd;
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brq->mrq.data = &brq->data;
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memset(brq, 0, sizeof(struct mmc_blk_request));
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brq->mrq.cmd = &brq->cmd;
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brq->mrq.data = &brq->data;
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brq->cmd.arg = blk_rq_pos(req);
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if (!mmc_card_blockaddr(card))
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brq->cmd.arg <<= 9;
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brq->cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_ADTC;
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brq->data.blksz = 512;
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brq->stop.opcode = MMC_STOP_TRANSMISSION;
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brq->stop.arg = 0;
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brq->stop.flags = MMC_RSP_SPI_R1B | MMC_RSP_R1B | MMC_CMD_AC;
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brq->data.blocks = blk_rq_sectors(req);
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brq->cmd.arg = blk_rq_pos(req);
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if (!mmc_card_blockaddr(card))
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brq->cmd.arg <<= 9;
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brq->cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_ADTC;
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brq->data.blksz = 512;
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brq->stop.opcode = MMC_STOP_TRANSMISSION;
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brq->stop.arg = 0;
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brq->stop.flags = MMC_RSP_SPI_R1B | MMC_RSP_R1B | MMC_CMD_AC;
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brq->data.blocks = blk_rq_sectors(req);
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/*
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* The block layer doesn't support all sector count
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* restrictions, so we need to be prepared for too big
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* requests.
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*/
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if (brq->data.blocks > card->host->max_blk_count)
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brq->data.blocks = card->host->max_blk_count;
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/*
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* The block layer doesn't support all sector count
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* restrictions, so we need to be prepared for too big
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* requests.
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/*
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* After a read error, we redo the request one sector at a time
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* in order to accurately determine which sectors can be read
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* successfully.
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*/
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if (disable_multi && brq->data.blocks > 1)
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brq->data.blocks = 1;
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if (brq->data.blocks > 1 || do_rel_wr) {
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/* SPI multiblock writes terminate using a special
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* token, not a STOP_TRANSMISSION request.
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*/
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if (brq->data.blocks > card->host->max_blk_count)
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brq->data.blocks = card->host->max_blk_count;
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if (!mmc_host_is_spi(card->host) ||
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rq_data_dir(req) == READ)
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brq->mrq.stop = &brq->stop;
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readcmd = MMC_READ_MULTIPLE_BLOCK;
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writecmd = MMC_WRITE_MULTIPLE_BLOCK;
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} else {
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brq->mrq.stop = NULL;
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readcmd = MMC_READ_SINGLE_BLOCK;
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writecmd = MMC_WRITE_BLOCK;
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}
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if (rq_data_dir(req) == READ) {
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brq->cmd.opcode = readcmd;
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brq->data.flags |= MMC_DATA_READ;
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} else {
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brq->cmd.opcode = writecmd;
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brq->data.flags |= MMC_DATA_WRITE;
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}
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/*
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* After a read error, we redo the request one sector at a time
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* in order to accurately determine which sectors can be read
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* successfully.
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*/
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if (disable_multi && brq->data.blocks > 1)
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brq->data.blocks = 1;
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if (do_rel_wr)
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mmc_apply_rel_rw(brq, card, req);
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if (brq->data.blocks > 1 || do_rel_wr) {
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/* SPI multiblock writes terminate using a special
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* token, not a STOP_TRANSMISSION request.
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*/
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if (!mmc_host_is_spi(card->host) ||
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rq_data_dir(req) == READ)
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brq->mrq.stop = &brq->stop;
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readcmd = MMC_READ_MULTIPLE_BLOCK;
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writecmd = MMC_WRITE_MULTIPLE_BLOCK;
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} else {
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brq->mrq.stop = NULL;
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readcmd = MMC_READ_SINGLE_BLOCK;
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writecmd = MMC_WRITE_BLOCK;
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}
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if (rq_data_dir(req) == READ) {
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brq->cmd.opcode = readcmd;
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brq->data.flags |= MMC_DATA_READ;
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} else {
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brq->cmd.opcode = writecmd;
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brq->data.flags |= MMC_DATA_WRITE;
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}
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/*
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* Pre-defined multi-block transfers are preferable to
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* open ended-ones (and necessary for reliable writes).
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* However, it is not sufficient to just send CMD23,
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* and avoid the final CMD12, as on an error condition
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* CMD12 (stop) needs to be sent anyway. This, coupled
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* with Auto-CMD23 enhancements provided by some
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* hosts, means that the complexity of dealing
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* with this is best left to the host. If CMD23 is
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* supported by card and host, we'll fill sbc in and let
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* the host deal with handling it correctly. This means
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* that for hosts that don't expose MMC_CAP_CMD23, no
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* change of behavior will be observed.
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*
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* N.B: Some MMC cards experience perf degradation.
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* We'll avoid using CMD23-bounded multiblock writes for
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* these, while retaining features like reliable writes.
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*/
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if (do_rel_wr)
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mmc_apply_rel_rw(brq, card, req);
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if ((md->flags & MMC_BLK_CMD23) &&
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mmc_op_multi(brq->cmd.opcode) &&
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(do_rel_wr || !(card->quirks & MMC_QUIRK_BLK_NO_CMD23))) {
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brq->sbc.opcode = MMC_SET_BLOCK_COUNT;
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brq->sbc.arg = brq->data.blocks |
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(do_rel_wr ? (1 << 31) : 0);
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brq->sbc.flags = MMC_RSP_R1 | MMC_CMD_AC;
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brq->mrq.sbc = &brq->sbc;
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}
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/*
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* Pre-defined multi-block transfers are preferable to
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* open ended-ones (and necessary for reliable writes).
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* However, it is not sufficient to just send CMD23,
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* and avoid the final CMD12, as on an error condition
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* CMD12 (stop) needs to be sent anyway. This, coupled
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* with Auto-CMD23 enhancements provided by some
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* hosts, means that the complexity of dealing
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* with this is best left to the host. If CMD23 is
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* supported by card and host, we'll fill sbc in and let
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* the host deal with handling it correctly. This means
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* that for hosts that don't expose MMC_CAP_CMD23, no
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* change of behavior will be observed.
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*
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* N.B: Some MMC cards experience perf degradation.
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* We'll avoid using CMD23-bounded multiblock writes for
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* these, while retaining features like reliable writes.
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*/
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mmc_set_data_timeout(&brq->data, card);
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if ((md->flags & MMC_BLK_CMD23) &&
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mmc_op_multi(brq->cmd.opcode) &&
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(do_rel_wr || !(card->quirks & MMC_QUIRK_BLK_NO_CMD23))) {
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brq->sbc.opcode = MMC_SET_BLOCK_COUNT;
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brq->sbc.arg = brq->data.blocks |
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(do_rel_wr ? (1 << 31) : 0);
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brq->sbc.flags = MMC_RSP_R1 | MMC_CMD_AC;
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brq->mrq.sbc = &brq->sbc;
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}
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brq->data.sg = mqrq->sg;
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brq->data.sg_len = mmc_queue_map_sg(mq, mqrq);
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mmc_set_data_timeout(&brq->data, card);
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/*
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* Adjust the sg list so it is the same size as the
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* request.
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*/
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if (brq->data.blocks != blk_rq_sectors(req)) {
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int i, data_size = brq->data.blocks << 9;
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struct scatterlist *sg;
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brq->data.sg = mq->mqrq_cur->sg;
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brq->data.sg_len = mmc_queue_map_sg(mq, mq->mqrq_cur);
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/*
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* Adjust the sg list so it is the same size as the
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* request.
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*/
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if (brq->data.blocks != blk_rq_sectors(req)) {
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int i, data_size = brq->data.blocks << 9;
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struct scatterlist *sg;
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for_each_sg(brq->data.sg, sg, brq->data.sg_len, i) {
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data_size -= sg->length;
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if (data_size <= 0) {
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sg->length += data_size;
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i++;
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break;
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}
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for_each_sg(brq->data.sg, sg, brq->data.sg_len, i) {
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data_size -= sg->length;
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if (data_size <= 0) {
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sg->length += data_size;
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i++;
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break;
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}
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brq->data.sg_len = i;
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}
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brq->data.sg_len = i;
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}
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mmc_queue_bounce_pre(mq->mqrq_cur);
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mmc_queue_bounce_pre(mqrq);
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}
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static int mmc_blk_issue_rw_rq(struct mmc_queue *mq, struct request *req)
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{
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struct mmc_blk_data *md = mq->data;
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struct mmc_card *card = md->queue.card;
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struct mmc_blk_request *brq = &mq->mqrq_cur->brq;
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int ret = 1, disable_multi = 0, retry = 0;
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do {
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mmc_blk_rw_rq_prep(mq->mqrq_cur, card, disable_multi, mq);
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mmc_wait_for_req(card->host, &brq->mrq);
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mmc_queue_bounce_post(mq->mqrq_cur);
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