コード例 #1
0
/*
 * Handle the detection and initialisation of a card.
 *
 * In the case of a resume, "oldcard" will contain the card
 * we're trying to reinitialise.
 */
static int mmc_sd_init_card(struct mmc_host *host, u32 ocr,
	struct mmc_card *oldcard)
{
	struct mmc_card *card;
	int err;
	u32 cid[4];
	unsigned int max_dtr;
#ifdef CONFIG_MMC_PARANOID_SD_INIT
	int retries;
#endif
	BUG_ON(!host);
	WARN_ON(!host->claimed);

	/*
	 * Since we're changing the OCR value, we seem to
	 * need to tell some cards to go back to the idle
	 * state.  We wait 1ms to give cards time to
	 * respond.
	 */
	mmc_go_idle(host);

	/*
	 * If SD_SEND_IF_COND indicates an SD 2.0
	 * compliant card and we should set bit 30
	 * of the ocr to indicate that we can handle
	 * block-addressed SDHC cards.
	 */
	err = mmc_send_if_cond(host, ocr);
	if (!err)
		ocr |= 1 << 30;

	err = mmc_send_app_op_cond(host, ocr, NULL);
	if (err)
		goto err;

	/*
	 * Fetch CID from card.
	 */
	if (mmc_host_is_spi(host))
		err = mmc_send_cid(host, cid);
	else
		err = mmc_all_send_cid(host, cid);
	if (err)
		goto err;

	if (oldcard) {
		if (memcmp(cid, oldcard->raw_cid, sizeof(cid)) != 0) {
			err = -ENOENT;
			goto err;
		}

		card = oldcard;
	} else {
		/*
		 * Allocate card structure.
		 */
		card = mmc_alloc_card(host, &sd_type);
		if (IS_ERR(card)) {
			err = PTR_ERR(card);
			goto err;
		}

		card->type = MMC_TYPE_SD;
		memcpy(card->raw_cid, cid, sizeof(card->raw_cid));
	}

	/*
	 * For native busses:  get card RCA and quit open drain mode.
	 */
	if (!mmc_host_is_spi(host)) {
		err = mmc_send_relative_addr(host, &card->rca);
		if (err)
			goto free_card;

		mmc_set_bus_mode(host, MMC_BUSMODE_PUSHPULL);
	}

	if (!oldcard) {
		/*
		 * Fetch CSD from card.
		 */
		err = mmc_send_csd(card, card->raw_csd);
		if (err)
			goto free_card;

		err = mmc_decode_csd(card);
		if (err)
			goto free_card;

		mmc_decode_cid(card);
	}

	/*
	 * Select card, as all following commands rely on that.
	 */
	if (!mmc_host_is_spi(host)) {
		err = mmc_select_card(card);
		if (err)
			goto free_card;
	}

	if (!oldcard) {
		/*
		 * Fetch SCR from card.
		 */
		err = mmc_app_send_scr(card, card->raw_scr);
		if (err)
			goto free_card;

		err = mmc_decode_scr(card);
		if (err < 0)
			goto free_card;
		/*
		 * Fetch switch information from card.
		 */
#ifdef CONFIG_MMC_PARANOID_SD_INIT
		for (retries = 1; retries <= 3; retries++) {
			err = mmc_read_switch(card);
			if (!err) {
				if (retries > 1) {
					printk(KERN_WARNING
					       "%s: recovered\n", 
					       mmc_hostname(host));
				}
				break;
			} else {
				printk(KERN_WARNING
				       "%s: read switch failed (attempt %d)\n",
				       mmc_hostname(host), retries);
			}
		}
#else
		err = mmc_read_switch(card);
#endif

		if (err)
			goto free_card;
	}

	/*
	 * For SPI, enable CRC as appropriate.
	 * This CRC enable is located AFTER the reading of the
	 * card registers because some SDHC cards are not able
	 * to provide valid CRCs for non-512-byte blocks.
	 */
	if (mmc_host_is_spi(host)) {
		err = mmc_spi_set_crc(host, use_spi_crc);
		if (err)
			goto free_card;
	}

	/*
	 * Attempt to change to high-speed (if supported)
	 */
	err = mmc_switch_hs(card);
	if (err)
		goto free_card;

	/*
	 * Compute bus speed.
	 */
	max_dtr = (unsigned int)-1;

	if (mmc_card_highspeed(card)) {
		if (max_dtr > card->sw_caps.hs_max_dtr)
			max_dtr = card->sw_caps.hs_max_dtr;
	} else if (max_dtr > card->csd.max_dtr) {
		max_dtr = card->csd.max_dtr;
	}

	mmc_set_clock(host, max_dtr);

	/*
	 * Switch to wider bus (if supported).
	 */
	if ((host->caps & MMC_CAP_4_BIT_DATA) &&
		(card->scr.bus_widths & SD_SCR_BUS_WIDTH_4)) {
		err = mmc_app_set_bus_width(card, MMC_BUS_WIDTH_4);
		if (err)
			goto free_card;

		mmc_set_bus_width(host, MMC_BUS_WIDTH_4);
	}

	/*
	 * Check if read-only switch is active.
	 */
	if (!oldcard) {
		if (!host->ops->get_ro || host->ops->get_ro(host) < 0) {
			printk(KERN_WARNING "%s: host does not "
				"support reading read-only "
				"switch. assuming write-enable.\n",
				mmc_hostname(host));
		} else {
			if (host->ops->get_ro(host) > 0)
				mmc_card_set_readonly(card);
		}
	}

	if (!oldcard)
		host->card = card;

	return 0;

free_card:
	if (!oldcard)
		mmc_remove_card(card);
err:

	return err;
}
コード例 #2
0
static int mmc_sd_init_card(struct mmc_host *host, u32 ocr,
	struct mmc_card *oldcard)
{
	struct mmc_card *card;
	int err;
	u32 cid[4];
	unsigned int max_dtr;
#ifdef CONFIG_MMC_PARANOID_SD_INIT
	int retries;
#endif
	BUG_ON(!host);
	WARN_ON(!host->claimed);

	
	mmc_go_idle(host);

	
	err = mmc_send_if_cond(host, ocr);
	if (!err)
		ocr |= 1 << 30;

	err = mmc_send_app_op_cond(host, ocr, NULL);
	if (err)
		goto err;

	
	if (mmc_host_is_spi(host))
		err = mmc_send_cid(host, cid);
	else
		err = mmc_all_send_cid(host, cid);
	if (err)
		goto err;

	if (oldcard) {
		if (memcmp(cid, oldcard->raw_cid, sizeof(cid)) != 0) {
			err = -ENOENT;
			goto err;
		}

		card = oldcard;
	} else {
		
		card = mmc_alloc_card(host, &sd_type);
		if (IS_ERR(card)) {
			err = PTR_ERR(card);
			goto err;
		}

		card->type = MMC_TYPE_SD;
		memcpy(card->raw_cid, cid, sizeof(card->raw_cid));
	}

	
	if (!mmc_host_is_spi(host)) {
		err = mmc_send_relative_addr(host, &card->rca);
		if (err)
			goto free_card;

		mmc_set_bus_mode(host, MMC_BUSMODE_PUSHPULL);
	}

	if (!oldcard) {
		
		err = mmc_send_csd(card, card->raw_csd);
		if (err)
			goto free_card;

		err = mmc_decode_csd(card);
		if (err)
			goto free_card;

		mmc_decode_cid(card);
	}

	
	if (!mmc_host_is_spi(host)) {
		err = mmc_select_card(card);
		if (err)
			goto free_card;
	}

	if (!oldcard) {
		
		err = mmc_app_send_scr(card, card->raw_scr);
		if (err)
			goto free_card;

		err = mmc_decode_scr(card);
		if (err < 0)
			goto free_card;
		
#ifdef CONFIG_MMC_PARANOID_SD_INIT
		for (retries = 1; retries <= 3; retries++) {
			err = mmc_read_switch(card);
			if (!err) {
				if (retries > 1) {
					printk(KERN_WARNING
					       "%s: recovered\n", 
					       mmc_hostname(host));
				}
				break;
			} else {
				printk(KERN_WARNING
				       "%s: read switch failed (attempt %d)\n",
				       mmc_hostname(host), retries);
			}
		}
#else
		err = mmc_read_switch(card);
#endif

		if (err)
			goto free_card;
	}

	
	if (mmc_host_is_spi(host)) {
		err = mmc_spi_set_crc(host, use_spi_crc);
		if (err)
			goto free_card;
	}

	
	err = mmc_switch_hs(card);
	if (err)
		goto free_card;

	
	max_dtr = (unsigned int)-1;

	if (mmc_card_highspeed(card)) {
		if (max_dtr > card->sw_caps.hs_max_dtr)
			max_dtr = card->sw_caps.hs_max_dtr;
	} else if (max_dtr > card->csd.max_dtr) {
		max_dtr = card->csd.max_dtr;
	}

	mmc_set_clock(host, max_dtr);

	
	if ((host->caps & MMC_CAP_4_BIT_DATA) &&
		(card->scr.bus_widths & SD_SCR_BUS_WIDTH_4)) {
		err = mmc_app_set_bus_width(card, MMC_BUS_WIDTH_4);
		if (err)
			goto free_card;

		mmc_set_bus_width(host, MMC_BUS_WIDTH_4);
	}

	
	if (!oldcard) {
		if (!host->ops->get_ro || host->ops->get_ro(host) < 0) {
			printk(KERN_WARNING "%s: host does not "
				"support reading read-only "
				"switch. assuming write-enable.\n",
				mmc_hostname(host));
		} else {
			if (host->ops->get_ro(host) > 0)
				mmc_card_set_readonly(card);
		}
	}

	if (!oldcard)
		host->card = card;

	return 0;

free_card:
	if (!oldcard)
		mmc_remove_card(card);
err:

	return err;
}
コード例 #3
0
int mmc_sd_setup_card(struct mmc_host *host, struct mmc_card *card,
	bool reinit)
{
	int err;
#ifdef CONFIG_MMC_PARANOID_SD_INIT
	int retries;
#endif

	if (!reinit) {
		/*
		 * Fetch SCR from card.
		 */
		err = mmc_app_send_scr(card, card->raw_scr);
		if (err)
			return err;

		err = mmc_decode_scr(card);
		if (err)
			return err;

		/*
		 * Fetch and process SD Status register.
		 */
		err = mmc_read_ssr(card);
		if (err)
			return err;

		/* Erase init depends on CSD and SSR */
		mmc_init_erase(card);

		/*
		 * Fetch switch information from card.
		 */
#ifdef CONFIG_MMC_PARANOID_SD_INIT
		for (retries = 1; retries <= 3; retries++) {
			err = mmc_read_switch(card);
			if (!err) {
				if (retries > 1) {
					printk(KERN_WARNING
					       "%s: recovered\n", 
					       mmc_hostname(host));
				}
				break;
			} else {
				printk(KERN_WARNING
				       "%s: read switch failed (attempt %d)\n",
				       mmc_hostname(host), retries);
			}
		}
#else
		err = mmc_read_switch(card);
#endif

		if (err)
			return err;
	}

	/*
	 * For SPI, enable CRC as appropriate.
	 * This CRC enable is located AFTER the reading of the
	 * card registers because some SDHC cards are not able
	 * to provide valid CRCs for non-512-byte blocks.
	 */
	if (mmc_host_is_spi(host)) {
		err = mmc_spi_set_crc(host, use_spi_crc);
		if (err)
			return err;
	}

	/*
	 * Check if read-only switch is active.
	 */
	if (!reinit) {
		int ro = -1;

		if (host->ops->get_ro)
			ro = host->ops->get_ro(host);

		if (ro < 0) {
			printk(KERN_WARNING "%s: host does not "
				"support reading read-only "
				"switch. assuming write-enable.\n",
				mmc_hostname(host));
		} else if (ro > 0) {
			mmc_card_set_readonly(card);
		}
	}

	return 0;
}