cfi_dev.c

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    1 /*-
    2  * SPDX-License-Identifier: BSD-3-Clause
    3  *
    4  * Copyright (c) 2007, Juniper Networks, Inc.
    5  * Copyright (c) 2012-2013, SRI International
    6  * All rights reserved.
    7  *
    8  * Portions of this software were developed by SRI International and the
    9  * University of Cambridge Computer Laboratory under DARPA/AFRL contract
   10  * (FA8750-10-C-0237) ("CTSRD"), as part of the DARPA CRASH research
   11  * programme.
   12  *
   13  * Redistribution and use in source and binary forms, with or without
   14  * modification, are permitted provided that the following conditions
   15  * are met:
   16  * 1. Redistributions of source code must retain the above copyright
   17  *    notice, this list of conditions and the following disclaimer.
   18  * 2. Redistributions in binary form must reproduce the above copyright
   19  *    notice, this list of conditions and the following disclaimer in the
   20  *    documentation and/or other materials provided with the distribution.
   21  * 3. Neither the name of the author nor the names of any co-contributors
   22  *    may be used to endorse or promote products derived from this software
   23  *    without specific prior written permission.
   24  *
   25  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
   26  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
   27  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
   28  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
   29  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
   30  * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
   31  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
   32  * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
   33  * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   34  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   35  * SUCH DAMAGE.
   36  */
   37 
   38 #include <sys/cdefs.h>
   39 __FBSDID("$FreeBSD$");
   40 
   41 #include "opt_cfi.h"
   42 
   43 #include <sys/param.h>
   44 #include <sys/systm.h>
   45 #include <sys/bus.h>
   46 #include <sys/conf.h>
   47 #include <sys/ioccom.h>
   48 #include <sys/kernel.h>
   49 #include <sys/limits.h>
   50 #include <sys/malloc.h>   
   51 #include <sys/proc.h>
   52 #include <sys/sysctl.h>
   53 #include <sys/types.h>
   54 #include <sys/uio.h>
   55 
   56 #include <sys/cfictl.h>
   57 
   58 #include <machine/atomic.h>
   59 #include <machine/bus.h>
   60 
   61 #include <dev/cfi/cfi_var.h>
   62 
   63 static d_open_t cfi_devopen;
   64 static d_close_t cfi_devclose;
   65 static d_read_t cfi_devread;
   66 static d_write_t cfi_devwrite;
   67 static d_ioctl_t cfi_devioctl;
   68 
   69 struct cdevsw cfi_cdevsw = {
   70         .d_version      =       D_VERSION,
   71         .d_flags        =       0,
   72         .d_name         =       cfi_driver_name,
   73         .d_open         =       cfi_devopen,
   74         .d_close        =       cfi_devclose,
   75         .d_read         =       cfi_devread,
   76         .d_write        =       cfi_devwrite,
   77         .d_ioctl        =       cfi_devioctl,
   78 };
   79 
   80 /*
   81  * Begin writing into a new block/sector.  We read the sector into
   82  * memory and keep updating that, until we move into another sector
   83  * or the process stops writing. At that time we write the whole
   84  * sector to flash (see cfi_block_finish).  To avoid unneeded erase
   85  * cycles, keep a pristine copy of the sector on hand.
   86  */
   87 int
   88 cfi_block_start(struct cfi_softc *sc, u_int ofs)
   89 {
   90         union {
   91                 uint8_t         *x8;
   92                 uint16_t        *x16;
   93                 uint32_t        *x32;
   94         } ptr;
   95         u_int rofs, rsz;
   96         uint32_t val;
   97         int r;
   98 
   99         rofs = 0;
  100         for (r = 0; r < sc->sc_regions; r++) {
  101                 rsz = sc->sc_region[r].r_blocks * sc->sc_region[r].r_blksz;
  102                 if (ofs < rofs + rsz)
  103                         break;
  104                 rofs += rsz;
  105         }
  106         if (r == sc->sc_regions)
  107                 return (EFAULT);
  108 
  109         sc->sc_wrbufsz = sc->sc_region[r].r_blksz;
  110         sc->sc_wrbuf = malloc(sc->sc_wrbufsz, M_TEMP, M_WAITOK);
  111         sc->sc_wrofs = ofs - (ofs - rofs) % sc->sc_wrbufsz;
  112 
  113         /* Read the block from flash for byte-serving. */
  114         ptr.x8 = sc->sc_wrbuf;
  115         for (r = 0; r < sc->sc_wrbufsz; r += sc->sc_width) {
  116                 val = cfi_read_raw(sc, sc->sc_wrofs + r);
  117                 switch (sc->sc_width) {
  118                 case 1:
  119                         *(ptr.x8)++ = val;
  120                         break;
  121                 case 2:
  122                         *(ptr.x16)++ = val;
  123                         break;
  124                 case 4:
  125                         *(ptr.x32)++ = val;
  126                         break;
  127                 }
  128         }
  129         sc->sc_wrbufcpy = malloc(sc->sc_wrbufsz, M_TEMP, M_WAITOK);
  130         memcpy(sc->sc_wrbufcpy, sc->sc_wrbuf, sc->sc_wrbufsz);
  131         sc->sc_writing = 1;
  132         return (0);
  133 }
  134 
  135 /*
  136  * Finish updating the current block/sector by writing the compound
  137  * set of changes to the flash.
  138  */
  139 int
  140 cfi_block_finish(struct cfi_softc *sc)
  141 {
  142         int error;
  143 
  144         error = cfi_write_block(sc);
  145         free(sc->sc_wrbuf, M_TEMP);
  146         free(sc->sc_wrbufcpy, M_TEMP);
  147         sc->sc_wrbuf = NULL;
  148         sc->sc_wrbufsz = 0;
  149         sc->sc_wrofs = 0;
  150         sc->sc_writing = 0;
  151         return (error);
  152 }
  153 
  154 static int
  155 cfi_devopen(struct cdev *dev, int oflags, int devtype, struct thread *td)
  156 {
  157         struct cfi_softc *sc;
  158 
  159         sc = dev->si_drv1;
  160         /* We allow only 1 open. */
  161         if (!atomic_cmpset_acq_ptr((uintptr_t *)&sc->sc_opened,
  162             (uintptr_t)NULL, (uintptr_t)td->td_proc))
  163                 return (EBUSY);
  164         return (0);
  165 }
  166 
  167 static int
  168 cfi_devclose(struct cdev *dev, int fflag, int devtype, struct thread *td)
  169 {
  170         struct cfi_softc *sc;
  171         int error;
  172 
  173         sc = dev->si_drv1;
  174         /* Sanity. Not really necessary. */
  175         if (sc->sc_opened != td->td_proc)
  176                 return (ENXIO);
  177 
  178         error = (sc->sc_writing) ? cfi_block_finish(sc) : 0;
  179         sc->sc_opened = NULL;
  180         return (error);
  181 }
  182 
  183 static int
  184 cfi_devread(struct cdev *dev, struct uio *uio, int ioflag)
  185 {
  186         union {
  187                 uint8_t         x8[4];
  188                 uint16_t        x16[2];
  189                 uint32_t        x32[1];
  190         } buf;
  191         struct cfi_softc *sc;
  192         u_int ofs;
  193         uint32_t val;
  194         int error;
  195 
  196         sc = dev->si_drv1;
  197 
  198         error = (sc->sc_writing) ? cfi_block_finish(sc) : 0;
  199         if (!error)
  200                 error = (uio->uio_offset > sc->sc_size) ? EIO : 0;
  201 
  202         while (error == 0 && uio->uio_resid > 0 &&
  203             uio->uio_offset < sc->sc_size) {
  204                 ofs = uio->uio_offset;
  205                 val = cfi_read_raw(sc, ofs);
  206                 switch (sc->sc_width) {
  207                 case 1:
  208                         buf.x8[0] = val;
  209                         break;
  210                 case 2:
  211                         buf.x16[0] = val;
  212                         break;
  213                 case 4:
  214                         buf.x32[0] = val;
  215                         break;
  216                 }
  217                 ofs &= sc->sc_width - 1;
  218                 error = uiomove(buf.x8 + ofs,
  219                     MIN(uio->uio_resid, sc->sc_width - ofs), uio);
  220         }
  221         return (error);
  222 }
  223 
  224 static int
  225 cfi_devwrite(struct cdev *dev, struct uio *uio, int ioflag)
  226 {
  227         struct cfi_softc *sc;
  228         u_int ofs, top;
  229         int error;
  230 
  231         sc = dev->si_drv1;
  232 
  233         error = (uio->uio_offset > sc->sc_size) ? EIO : 0;
  234         while (error == 0 && uio->uio_resid > 0 &&
  235             uio->uio_offset < sc->sc_size) {
  236                 ofs = uio->uio_offset;
  237 
  238                 /*
  239                  * Finish the current block if we're about to write
  240                  * to a different block.
  241                  */
  242                 if (sc->sc_writing) {
  243                         top = sc->sc_wrofs + sc->sc_wrbufsz;
  244                         if (ofs < sc->sc_wrofs || ofs >= top)
  245                                 cfi_block_finish(sc);
  246                 }
  247 
  248                 /* Start writing to a (new) block if applicable. */
  249                 if (!sc->sc_writing) {
  250                         error = cfi_block_start(sc, uio->uio_offset);
  251                         if (error)
  252                                 break;
  253                 }
  254 
  255                 top = sc->sc_wrofs + sc->sc_wrbufsz;
  256                 error = uiomove(sc->sc_wrbuf + ofs - sc->sc_wrofs,
  257                     MIN(top - ofs, uio->uio_resid), uio);
  258         }
  259         return (error);
  260 }
  261 
  262 static int
  263 cfi_devioctl(struct cdev *dev, u_long cmd, caddr_t data, int fflag,
  264     struct thread *td)
  265 {
  266         struct cfi_softc *sc;
  267         struct cfiocqry *rq;
  268         int error;
  269         u_char val;
  270 
  271         sc = dev->si_drv1;
  272         error = 0;
  273 
  274         switch (cmd) {
  275         case CFIOCQRY:
  276                 if (sc->sc_writing) {
  277                         error = cfi_block_finish(sc);
  278                         if (error)
  279                                 break;
  280                 }
  281                 rq = (struct cfiocqry *)data;
  282                 if (rq->offset >= sc->sc_size / sc->sc_width)
  283                         return (ESPIPE);
  284                 if (rq->offset > ULONG_MAX - rq->count ||
  285                     rq->offset + rq->count > sc->sc_size / sc->sc_width)
  286                         return (ENOSPC);
  287 
  288                 while (!error && rq->count--) {
  289                         val = cfi_read_qry(sc, rq->offset++);
  290                         error = copyout(&val, rq->buffer++, 1);
  291                 }
  292                 break;
  293 #ifdef CFI_SUPPORT_STRATAFLASH
  294         case CFIOCGFACTORYPR:
  295                 error = cfi_intel_get_factory_pr(sc, (uint64_t *)data);
  296                 break;
  297         case CFIOCGOEMPR:
  298                 error = cfi_intel_get_oem_pr(sc, (uint64_t *)data);
  299                 break;
  300         case CFIOCSOEMPR:
  301                 error = cfi_intel_set_oem_pr(sc, *(uint64_t *)data);
  302                 break;
  303         case CFIOCGPLR:
  304                 error = cfi_intel_get_plr(sc, (uint32_t *)data);
  305                 break;
  306         case CFIOCSPLR:
  307                 error = cfi_intel_set_plr(sc);
  308                 break;
  309 #endif /* CFI_SUPPORT_STRATAFLASH */
  310         default:
  311                 error = ENOIOCTL;
  312                 break;
  313         }
  314         return (error);
  315 }
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FreeBSD/Linux Kernel Cross Reference sys/dev/cfi/cfi_dev.c

FreeBSD/Linux Kernel Cross Reference
sys/dev/cfi/cfi_dev.c
