2 * SPDX-License-Identifier: BSD-3-Clause
4 * Copyright (c) 2007, Juniper Networks, Inc.
5 * Copyright (c) 2012-2013, SRI International
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
13 * Redistribution and use in source and binary forms, with or without
14 * modification, are permitted provided that the following conditions
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.
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
38 #include <sys/cdefs.h>
41 #include <sys/param.h>
42 #include <sys/systm.h>
45 #include <sys/ioccom.h>
46 #include <sys/kernel.h>
47 #include <sys/limits.h>
48 #include <sys/malloc.h>
50 #include <sys/sysctl.h>
51 #include <sys/types.h>
54 #include <sys/cfictl.h>
56 #include <machine/atomic.h>
57 #include <machine/bus.h>
59 #include <dev/cfi/cfi_var.h>
61 static d_open_t cfi_devopen;
62 static d_close_t cfi_devclose;
63 static d_read_t cfi_devread;
64 static d_write_t cfi_devwrite;
65 static d_ioctl_t cfi_devioctl;
67 struct cdevsw cfi_cdevsw = {
68 .d_version = D_VERSION,
70 .d_name = cfi_driver_name,
71 .d_open = cfi_devopen,
72 .d_close = cfi_devclose,
73 .d_read = cfi_devread,
74 .d_write = cfi_devwrite,
75 .d_ioctl = cfi_devioctl,
79 * Begin writing into a new block/sector. We read the sector into
80 * memory and keep updating that, until we move into another sector
81 * or the process stops writing. At that time we write the whole
82 * sector to flash (see cfi_block_finish). To avoid unneeded erase
83 * cycles, keep a pristine copy of the sector on hand.
86 cfi_block_start(struct cfi_softc *sc, u_int ofs)
98 for (r = 0; r < sc->sc_regions; r++) {
99 rsz = sc->sc_region[r].r_blocks * sc->sc_region[r].r_blksz;
100 if (ofs < rofs + rsz)
104 if (r == sc->sc_regions)
107 sc->sc_wrbufsz = sc->sc_region[r].r_blksz;
108 sc->sc_wrbuf = malloc(sc->sc_wrbufsz, M_TEMP, M_WAITOK);
109 sc->sc_wrofs = ofs - (ofs - rofs) % sc->sc_wrbufsz;
111 /* Read the block from flash for byte-serving. */
112 ptr.x8 = sc->sc_wrbuf;
113 for (r = 0; r < sc->sc_wrbufsz; r += sc->sc_width) {
114 val = cfi_read_raw(sc, sc->sc_wrofs + r);
115 switch (sc->sc_width) {
127 sc->sc_wrbufcpy = malloc(sc->sc_wrbufsz, M_TEMP, M_WAITOK);
128 memcpy(sc->sc_wrbufcpy, sc->sc_wrbuf, sc->sc_wrbufsz);
134 * Finish updating the current block/sector by writing the compound
135 * set of changes to the flash.
138 cfi_block_finish(struct cfi_softc *sc)
142 error = cfi_write_block(sc);
143 free(sc->sc_wrbuf, M_TEMP);
144 free(sc->sc_wrbufcpy, M_TEMP);
153 cfi_devopen(struct cdev *dev, int oflags, int devtype, struct thread *td)
155 struct cfi_softc *sc;
158 /* We allow only 1 open. */
159 if (!atomic_cmpset_acq_ptr((uintptr_t *)&sc->sc_opened,
160 (uintptr_t)NULL, (uintptr_t)td->td_proc))
166 cfi_devclose(struct cdev *dev, int fflag, int devtype, struct thread *td)
168 struct cfi_softc *sc;
172 /* Sanity. Not really necessary. */
173 if (sc->sc_opened != td->td_proc)
176 error = (sc->sc_writing) ? cfi_block_finish(sc) : 0;
177 sc->sc_opened = NULL;
182 cfi_devread(struct cdev *dev, struct uio *uio, int ioflag)
189 struct cfi_softc *sc;
196 error = (sc->sc_writing) ? cfi_block_finish(sc) : 0;
198 error = (uio->uio_offset > sc->sc_size) ? EIO : 0;
200 while (error == 0 && uio->uio_resid > 0 &&
201 uio->uio_offset < sc->sc_size) {
202 ofs = uio->uio_offset;
203 val = cfi_read_raw(sc, ofs);
204 switch (sc->sc_width) {
215 ofs &= sc->sc_width - 1;
216 error = uiomove(buf.x8 + ofs,
217 MIN(uio->uio_resid, sc->sc_width - ofs), uio);
223 cfi_devwrite(struct cdev *dev, struct uio *uio, int ioflag)
225 struct cfi_softc *sc;
231 error = (uio->uio_offset > sc->sc_size) ? EIO : 0;
232 while (error == 0 && uio->uio_resid > 0 &&
233 uio->uio_offset < sc->sc_size) {
234 ofs = uio->uio_offset;
237 * Finish the current block if we're about to write
238 * to a different block.
240 if (sc->sc_writing) {
241 top = sc->sc_wrofs + sc->sc_wrbufsz;
242 if (ofs < sc->sc_wrofs || ofs >= top)
243 cfi_block_finish(sc);
246 /* Start writing to a (new) block if applicable. */
247 if (!sc->sc_writing) {
248 error = cfi_block_start(sc, uio->uio_offset);
253 top = sc->sc_wrofs + sc->sc_wrbufsz;
254 error = uiomove(sc->sc_wrbuf + ofs - sc->sc_wrofs,
255 MIN(top - ofs, uio->uio_resid), uio);
261 cfi_devioctl(struct cdev *dev, u_long cmd, caddr_t data, int fflag,
264 struct cfi_softc *sc;
274 if (sc->sc_writing) {
275 error = cfi_block_finish(sc);
279 rq = (struct cfiocqry *)data;
280 if (rq->offset >= sc->sc_size / sc->sc_width)
282 if (rq->offset > ULONG_MAX - rq->count ||
283 rq->offset + rq->count > sc->sc_size / sc->sc_width)
286 while (!error && rq->count--) {
287 val = cfi_read_qry(sc, rq->offset++);
288 error = copyout(&val, rq->buffer++, 1);
291 #ifdef CFI_SUPPORT_STRATAFLASH
292 case CFIOCGFACTORYPR:
293 error = cfi_intel_get_factory_pr(sc, (uint64_t *)data);
296 error = cfi_intel_get_oem_pr(sc, (uint64_t *)data);
299 error = cfi_intel_set_oem_pr(sc, *(uint64_t *)data);
302 error = cfi_intel_get_plr(sc, (uint32_t *)data);
305 error = cfi_intel_set_plr(sc);
307 #endif /* CFI_SUPPORT_STRATAFLASH */