89dcfbd0c6
Erase operation gives card's logic information about unused areas to help it implement wear-leveling with lower overhead comparing to usual writing. Erase is much faster then write and does not depends on data bus speed. Also as result of hitting in-card write logic optimizations I have measured up to 50% performance boost on writing undersized blocks into preerased areas. At the same time there are strict limitations on size and allignment of erase operations. We can erase only blocks aligned to the erase sector size and with size multiple of it. Different cards has different erase sector size which usually varies from 64KB to 4MB. SD cards actually allow to erase smaller blocks, but it is much more expensive as it is implemented via read-erase-write sequence and so not sutable for the BIO_DELETE purposes. Reviewed by: imp@
92 lines
3.9 KiB
C
92 lines
3.9 KiB
C
/*-
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* Copyright (c) 2006 Bernd Walter. All rights reserved.
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* Copyright (c) 2006 M. Warner Losh. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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* Portions of this software may have been developed with reference to
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* the SD Simplified Specification. The following disclaimer may apply:
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*
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* The following conditions apply to the release of the simplified
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* specification ("Simplified Specification") by the SD Card Association and
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* the SD Group. The Simplified Specification is a subset of the complete SD
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* Specification which is owned by the SD Card Association and the SD
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* Group. This Simplified Specification is provided on a non-confidential
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* basis subject to the disclaimers below. Any implementation of the
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* Simplified Specification may require a license from the SD Card
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* Association, SD Group, SD-3C LLC or other third parties.
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*
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* Disclaimers:
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*
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* The information contained in the Simplified Specification is presented only
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* as a standard specification for SD Cards and SD Host/Ancillary products and
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* is provided "AS-IS" without any representations or warranties of any
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* kind. No responsibility is assumed by the SD Group, SD-3C LLC or the SD
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* Card Association for any damages, any infringements of patents or other
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* right of the SD Group, SD-3C LLC, the SD Card Association or any third
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* parties, which may result from its use. No license is granted by
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* implication, estoppel or otherwise under any patent or other rights of the
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* SD Group, SD-3C LLC, the SD Card Association or any third party. Nothing
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* herein shall be construed as an obligation by the SD Group, the SD-3C LLC
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* or the SD Card Association to disclose or distribute any technical
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* information, know-how or other confidential information to any third party.
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*
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* "$FreeBSD$"
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*/
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#ifndef DEV_MMC_MMCVAR_H
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#define DEV_MMC_MMCVAR_H
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#include <dev/mmc/bridge.h>
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enum mmc_device_ivars {
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MMC_IVAR_DSR_IMP,
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MMC_IVAR_MEDIA_SIZE,
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MMC_IVAR_RCA,
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MMC_IVAR_SECTOR_SIZE,
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MMC_IVAR_TRAN_SPEED,
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MMC_IVAR_READ_ONLY,
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MMC_IVAR_HIGH_CAP,
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MMC_IVAR_CARD_TYPE,
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MMC_IVAR_BUS_WIDTH,
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MMC_IVAR_ERASE_SECTOR,
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// MMC_IVAR_,
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};
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/*
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* Simplified accessors for pci devices
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*/
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#define MMC_ACCESSOR(var, ivar, type) \
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__BUS_ACCESSOR(mmc, var, MMC, ivar, type)
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MMC_ACCESSOR(dsr_imp, DSR_IMP, int)
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MMC_ACCESSOR(media_size, MEDIA_SIZE, off_t)
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MMC_ACCESSOR(rca, RCA, int)
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MMC_ACCESSOR(sector_size, SECTOR_SIZE, int)
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MMC_ACCESSOR(tran_speed, TRAN_SPEED, int)
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MMC_ACCESSOR(read_only, READ_ONLY, int)
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MMC_ACCESSOR(high_cap, HIGH_CAP, int)
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MMC_ACCESSOR(card_type, CARD_TYPE, int)
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MMC_ACCESSOR(bus_width, BUS_WIDTH, int)
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MMC_ACCESSOR(erase_sector, ERASE_SECTOR, int)
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#endif /* DEV_MMC_MMCVAR_H */
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