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3d705d14fe
Some eMMC and SD cards implement a DSR register that allows to tune raise/fall times and drive strength of the CMD and DATA outputs. The values to use depend on the card in use and the host. It might be needed to reduce the drive strength to prevent voltage peaks above the host's specification. Implement a 'dsr' devicetree property that allows to specify the value to set the DSR to. For non-dt setups the new members of mmc_host can be set by board code. This patch was initially authored by Sascha Hauer. It contains improvements authored by Markus Niebel and Uwe Kleine-König. Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de> Signed-off-by: Markus Niebel <Markus.Niebel@tq-group.com> Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de> Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
32 lines
1.2 KiB
C
32 lines
1.2 KiB
C
/*
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* linux/drivers/mmc/core/mmc_ops.h
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*
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* Copyright 2006-2007 Pierre Ossman
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or (at
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* your option) any later version.
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*/
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#ifndef _MMC_MMC_OPS_H
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#define _MMC_MMC_OPS_H
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int mmc_select_card(struct mmc_card *card);
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int mmc_deselect_cards(struct mmc_host *host);
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int mmc_set_dsr(struct mmc_host *host);
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int mmc_go_idle(struct mmc_host *host);
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int mmc_send_op_cond(struct mmc_host *host, u32 ocr, u32 *rocr);
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int mmc_all_send_cid(struct mmc_host *host, u32 *cid);
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int mmc_set_relative_addr(struct mmc_card *card);
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int mmc_send_csd(struct mmc_card *card, u32 *csd);
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int mmc_send_ext_csd(struct mmc_card *card, u8 *ext_csd);
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int mmc_send_status(struct mmc_card *card, u32 *status);
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int mmc_send_cid(struct mmc_host *host, u32 *cid);
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int mmc_spi_read_ocr(struct mmc_host *host, int highcap, u32 *ocrp);
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int mmc_spi_set_crc(struct mmc_host *host, int use_crc);
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int mmc_bus_test(struct mmc_card *card, u8 bus_width);
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int mmc_send_hpi_cmd(struct mmc_card *card, u32 *status);
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#endif
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