f43581345b
Rework the timeout code to use actual time rather than a DELAY() loop and to use both typical and maximum to allow logging of timeout failures. Also correct the erase timeout, it is specified in milliseconds not microseconds like the other timeouts. Do not invoke DELAY() between status queries as this adds significant latency which in turn reduced write performance substantially. Sanity check timeout values from the hardware. Implement support for buffered writes (only enabled on Intel/Sharp parts for now). This yields an order of magnitude speedup on the 64MB Intel StrataFlash parts we use. When making a copy of the block to modify, also keep a clean copy around until we are ready to commit the block and use it to avoid unnecessary erases. In the non-buffer write case, also use it to avoid unnecessary writes when the block has not been erased. This yields a significant speedup when doing things like zeroing a block. Sponsored by: DARPA, AFRL Reviewed by: imp (previous version)
106 lines
3.4 KiB
C
106 lines
3.4 KiB
C
/*-
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* Copyright (c) 2007, Juniper Networks, Inc.
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* Copyright (c) 2012-2013, SRI International
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* All rights reserved.
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*
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* Portions of this software were developed by SRI International and the
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* University of Cambridge Computer Laboratory under DARPA/AFRL contract
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* (FA8750-10-C-0237) ("CTSRD"), as part of the DARPA CRASH research
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* programme.
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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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* 3. Neither the name of the author nor the names of any co-contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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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,
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* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
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* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* $FreeBSD$
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*/
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#ifndef _DEV_CFI_VAR_H_
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#define _DEV_CFI_VAR_H_
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enum cfi_wait_cmd {
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CFI_TIMEOUT_ERASE,
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CFI_TIMEOUT_WRITE,
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CFI_TIMEOUT_BUFWRITE
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};
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struct cfi_region {
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u_int r_blocks;
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u_int r_blksz;
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};
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struct cfi_softc {
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device_t sc_dev;
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struct resource *sc_res;
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bus_space_handle_t sc_handle;
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bus_space_tag_t sc_tag;
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int sc_rid;
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u_int sc_size; /* Flash size. */
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u_int sc_width; /* Interface width. */
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u_int sc_regions; /* Erase regions. */
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struct cfi_region *sc_region; /* Array of region info. */
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u_int sc_cmdset;
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sbintime_t sc_typical_timeouts[3];
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sbintime_t sc_max_timeouts[3];
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u_int sc_tto_counts[3];
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u_int sc_mto_counts[3];
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u_int sc_maxbuf;
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struct cdev *sc_nod;
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struct proc *sc_opened; /* Process that has us opened. */
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u_char *sc_wrbuf;
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u_char *sc_wrbufcpy;
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u_int sc_wrbufsz;
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u_int sc_wrofs;
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u_int sc_writing;
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};
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extern char cfi_driver_name[];
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extern devclass_t cfi_devclass;
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extern devclass_t cfi_diskclass;
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int cfi_probe(device_t);
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int cfi_attach(device_t);
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int cfi_detach(device_t);
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uint32_t cfi_read_raw(struct cfi_softc *, u_int);
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uint32_t cfi_read(struct cfi_softc *, u_int);
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uint8_t cfi_read_qry(struct cfi_softc *, u_int);
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int cfi_write_block(struct cfi_softc *);
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int cfi_block_start(struct cfi_softc *, u_int);
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int cfi_block_finish(struct cfi_softc *);
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#ifdef CFI_SUPPORT_STRATAFLASH
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int cfi_intel_get_factory_pr(struct cfi_softc *sc, uint64_t *);
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int cfi_intel_get_oem_pr(struct cfi_softc *sc, uint64_t *);
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int cfi_intel_set_oem_pr(struct cfi_softc *sc, uint64_t);
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int cfi_intel_get_plr(struct cfi_softc *sc, uint32_t *);
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int cfi_intel_set_plr(struct cfi_softc *sc);
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#endif /* CFI_SUPPORT_STRATAFLASH */
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#endif /* _DEV_CFI_VAR_H_ */
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