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Commit 85a18ad9 authored by Pierre Ossman's avatar Pierre Ossman
Browse files

mmc: MMC sector based cards 



Support for MMC 4.2 sector based cards. This tweaks the init a
bit and reads a new field out of the EXT_CSD.

Signed-off-by: default avatarPierre Ossman <drzeus@drzeus.cx>
parent de859895

drivers/mmc/mmc.c

+22 −3
Original line number Diff line number Diff line
@@ -1106,11 +1106,29 @@ static void mmc_process_ext_csds(struct mmc_host *host) 
		mmc_wait_for_req(host, &mrq);



		if (cmd.error != MMC_ERR_NONE || data.error != MMC_ERR_NONE) {

			printk("%s: unable to read EXT_CSD, performance "

				"might suffer.\n", mmc_hostname(card->host));

			if (card->csd.capacity == (4096 * 512)) {

				printk(KERN_ERR "%s: unable to read EXT_CSD "

					"on a possible high capacity card. "

					"Card will be ignored.\n",

					mmc_hostname(card->host));

				mmc_card_set_dead(card);

			} else {

				printk(KERN_WARNING "%s: unable to read "

					"EXT_CSD, performance might "

					"suffer.\n",

					mmc_hostname(card->host));

			}

			continue;

		}



		card->ext_csd.sectors =

			ext_csd[EXT_CSD_SEC_CNT + 0] << 0 |

			ext_csd[EXT_CSD_SEC_CNT + 1] << 8 |

			ext_csd[EXT_CSD_SEC_CNT + 2] << 16 |

			ext_csd[EXT_CSD_SEC_CNT + 3] << 24;

		if (card->ext_csd.sectors)

			mmc_card_set_blockaddr(card);



		switch (ext_csd[EXT_CSD_CARD_TYPE]) {

		case EXT_CSD_CARD_TYPE_52 | EXT_CSD_CARD_TYPE_26:

			card->ext_csd.hs_max_dtr = 52000000;
@@ -1499,7 +1517,8 @@ static void mmc_setup(struct mmc_host *host) 
			mmc_send_app_op_cond(host, host->ocr | (sd2 << 30), NULL);

		}

	} else {

		mmc_send_op_cond(host, host->ocr, NULL);

		/* The extra bit indicates that we support high capacity */

		mmc_send_op_cond(host, host->ocr | (1 << 30), NULL);

	}



	mmc_discover_cards(host);

drivers/mmc/mmc_block.c

+14 −5
Original line number Diff line number Diff line
@@ -491,11 +491,20 @@ static struct mmc_blk_data *mmc_blk_alloc(struct mmc_card *card) 


	blk_queue_hardsect_size(md->queue.queue, 1 << md->block_bits);



	if (!mmc_card_sd(card) && mmc_card_blockaddr(card)) {

		/*

		 * The EXT_CSD sector count is in number or 512 byte

		 * sectors.

		 */

		set_capacity(md->disk, card->ext_csd.sectors);

	} else {

		/*

		 * The CSD capacity field is in units of read_blkbits.

		 * set_capacity takes units of 512 bytes.

		 */

	set_capacity(md->disk, card->csd.capacity << (card->csd.read_blkbits - 9));

		set_capacity(md->disk,

			card->csd.capacity << (card->csd.read_blkbits - 9));

	}

	return md;



 err_putdisk:

include/linux/mmc/card.h

+1 −0
Original line number Diff line number Diff line
@@ -41,6 +41,7 @@ struct mmc_csd { 


struct mmc_ext_csd {

	unsigned int		hs_max_dtr;

	unsigned int		sectors;

};



struct sd_scr {

include/linux/mmc/protocol.h

+1 −0
Original line number Diff line number Diff line
@@ -284,6 +284,7 @@ struct _mmc_csd { 
#define EXT_CSD_BUS_WIDTH	183	/* R/W */

#define EXT_CSD_HS_TIMING	185	/* R/W */

#define EXT_CSD_CARD_TYPE	196	/* RO */

#define EXT_CSD_SEC_CNT		212	/* RO, 4 bytes */



/*

 * EXT_CSD field definitions