2 * Copyright (c) 2019 Justin Hibbits
4 * Redistribution and use in source and binary forms, with or without
5 * modification, are permitted provided that the following conditions
7 * 1. Redistributions of source code must retain the above copyright
8 * notice, this list of conditions and the following disclaimer.
9 * 2. Redistributions in binary form must reproduce the above copyright
10 * notice, this list of conditions and the following disclaimer in the
11 * documentation and/or other materials provided with the distribution.
13 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
14 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
15 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
16 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
17 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
18 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
19 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
20 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
21 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
22 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
26 #include <sys/cdefs.h>
27 __FBSDID("$FreeBSD$");
29 #include <sys/param.h>
30 #include <sys/systm.h>
33 #include <sys/kernel.h>
34 #include <sys/kthread.h>
35 #include <sys/module.h>
36 #include <sys/mutex.h>
38 #include <geom/geom_disk.h>
43 #include <dev/ofw/ofw_bus.h>
44 #include <dev/ofw/ofw_bus_subr.h>
45 #include <dev/ofw/openfirm.h>
49 * OPAL System flash driver, using OPAL firmware calls to access the device.
51 * This just presents the base block interface. The fdt_slicer can be used on
52 * top to present the partitions listed in the fdt.
54 * There are three OPAL methods used: OPAL_FLASH_READ, OPAL_FLASH_WRITE, and
55 * OPAL_FLASH_ERASE. At the firmware layer, READ and WRITE can be on arbitrary
56 * boundaries, but ERASE is only at flash-block-size block alignments and sizes.
57 * To account for this, the following restrictions are in place:
59 * - Reads are on a 512-byte block boundary and size
60 * - Writes and Erases are aligned and sized on flash-block-size bytes.
62 * In order to support the fdt_slicer we present a type attribute of
65 struct opalflash_softc {
70 struct bio_queue_head sc_bio_queue;
74 #define OPALFLASH_LOCK(sc) mtx_lock(&(sc)->sc_mtx)
75 #define OPALFLASH_UNLOCK(sc) mtx_unlock(&(sc)->sc_mtx)
76 #define OPALFLASH_LOCK_INIT(sc) \
77 mtx_init(&(sc)->sc_mtx, device_get_nameunit((sc)->sc_dev), \
80 #define FLASH_BLOCKSIZE 512
82 static int opalflash_probe(device_t);
83 static int opalflash_attach(device_t);
85 static device_method_t opalflash_methods[] = {
86 /* Device interface */
87 DEVMETHOD(device_probe, opalflash_probe),
88 DEVMETHOD(device_attach, opalflash_attach),
93 static driver_t opalflash_driver = {
96 sizeof(struct opalflash_softc)
99 static devclass_t opalflash_devclass;
101 DRIVER_MODULE(opalflash, opal, opalflash_driver, opalflash_devclass, 0, 0);
103 /* GEOM Disk interfaces. */
105 opalflash_open(struct disk *dp)
112 opalflash_close(struct disk *dp)
119 opalflash_ioctl(struct disk *dp, u_long cmd, void *data, int fflag,
126 /* Handle the one attribute we need to play nice with geom_flashmap. */
128 opalflash_getattr(struct bio *bp)
130 struct opalflash_softc *sc;
133 if (bp->bio_disk == NULL || bp->bio_disk->d_drv1 == NULL)
136 sc = bp->bio_disk->d_drv1;
139 if (strcmp(bp->bio_attribute, "NAND::device") == 0) {
140 if (bp->bio_length != sizeof(dev))
142 bcopy(&dev, bp->bio_data, sizeof(dev));
149 opalflash_strategy(struct bio *bp)
151 struct opalflash_softc *sc;
153 sc = (struct opalflash_softc *)bp->bio_disk->d_drv1;
155 bioq_disksort(&sc->sc_bio_queue, bp);
157 OPALFLASH_UNLOCK(sc);
161 opalflash_read(struct opalflash_softc *sc, off_t off,
162 caddr_t data, off_t count)
167 /* Ensure we write aligned to a full block size. */
168 if (off % sc->sc_disk->d_sectorsize != 0 ||
169 count % sc->sc_disk->d_sectorsize != 0)
172 token = opal_alloc_async_token();
175 * Read one page at a time. It's not guaranteed that the buffer is
176 * physically contiguous.
179 size = MIN(count, PAGE_SIZE);
180 rv = opal_call(OPAL_FLASH_READ, sc->sc_opal_id, off,
181 vtophys(data), size, token);
182 if (rv == OPAL_ASYNC_COMPLETION)
183 rv = opal_wait_completion(&msg, sizeof(msg), token);
184 if (rv != OPAL_SUCCESS)
189 opal_free_async_token(token);
190 if (rv == OPAL_SUCCESS)
199 opalflash_erase(struct opalflash_softc *sc, off_t off, off_t count)
204 /* Ensure we write aligned to a full block size. */
205 if (off % sc->sc_disk->d_stripesize != 0 ||
206 count % sc->sc_disk->d_stripesize != 0)
209 token = opal_alloc_async_token();
211 rv = opal_call(OPAL_FLASH_ERASE, sc->sc_opal_id, off, count, token);
212 if (rv == OPAL_ASYNC_COMPLETION)
213 rv = opal_wait_completion(&msg, sizeof(msg), token);
214 opal_free_async_token(token);
216 if (rv == OPAL_SUCCESS)
225 opalflash_write(struct opalflash_softc *sc, off_t off,
226 caddr_t data, off_t count)
231 /* Ensure we write aligned to a full block size. */
232 if (off % sc->sc_disk->d_stripesize != 0 ||
233 count % sc->sc_disk->d_stripesize != 0)
236 /* Erase the full block first, then write in page chunks. */
237 rv = opalflash_erase(sc, off, count);
241 token = opal_alloc_async_token();
244 * Write one page at a time. It's not guaranteed that the buffer is
245 * physically contiguous.
248 size = MIN(count, PAGE_SIZE);
249 rv = opal_call(OPAL_FLASH_WRITE, sc->sc_opal_id, off,
250 vtophys(data), size, token);
251 if (rv == OPAL_ASYNC_COMPLETION)
252 rv = opal_wait_completion(&msg, sizeof(msg), token);
253 if (rv != OPAL_SUCCESS)
258 opal_free_async_token(token);
260 if (rv == OPAL_SUCCESS)
268 /* Main flash handling task. */
270 opalflash_task(void *arg)
272 struct opalflash_softc *sc;
282 bp = bioq_first(&sc->sc_bio_queue);
284 msleep(sc, &sc->sc_mtx, PRIBIO, "opalflash", 0);
285 } while (bp == NULL);
286 bioq_remove(&sc->sc_bio_queue, bp);
287 OPALFLASH_UNLOCK(sc);
289 switch (bp->bio_cmd) {
291 bp->bio_error = opalflash_erase(sc, bp->bio_offset,
295 bp->bio_error = opalflash_read(sc, bp->bio_offset,
296 bp->bio_data, bp->bio_bcount);
299 bp->bio_error = opalflash_write(sc, bp->bio_offset,
300 bp->bio_data, bp->bio_bcount);
303 bp->bio_error = EINVAL;
310 /* Device driver interfaces. */
313 opalflash_probe(device_t dev)
315 if (!ofw_bus_is_compatible(dev, "ibm,opal-flash"))
318 device_set_desc(dev, "OPAL System Flash");
320 return (BUS_PROBE_GENERIC);
324 opalflash_attach(device_t dev)
326 struct opalflash_softc *sc;
328 cell_t flash_blocksize, opal_id;
331 sc = device_get_softc(dev);
334 node = ofw_bus_get_node(dev);
335 OF_getencprop(node, "ibm,opal-id", &opal_id, sizeof(opal_id));
336 sc->sc_opal_id = opal_id;
338 if (OF_getencprop(node, "ibm,flash-block-size",
339 &flash_blocksize, sizeof(flash_blocksize)) < 0) {
340 device_printf(dev, "Cannot determine flash block size.\n");
344 OPALFLASH_LOCK_INIT(sc);
346 if (OF_getencprop(node, "reg", regs, sizeof(regs)) < 0) {
347 device_printf(dev, "Unable to get flash size.\n");
351 sc->sc_disk = disk_alloc();
352 sc->sc_disk->d_name = "opalflash";
353 sc->sc_disk->d_open = opalflash_open;
354 sc->sc_disk->d_close = opalflash_close;
355 sc->sc_disk->d_strategy = opalflash_strategy;
356 sc->sc_disk->d_ioctl = opalflash_ioctl;
357 sc->sc_disk->d_getattr = opalflash_getattr;
358 sc->sc_disk->d_drv1 = sc;
359 sc->sc_disk->d_maxsize = DFLTPHYS;
360 sc->sc_disk->d_mediasize = regs[1];
361 sc->sc_disk->d_unit = device_get_unit(sc->sc_dev);
362 sc->sc_disk->d_sectorsize = FLASH_BLOCKSIZE;
363 sc->sc_disk->d_stripesize = flash_blocksize;
364 sc->sc_disk->d_dump = NULL;
366 disk_create(sc->sc_disk, DISK_VERSION);
367 bioq_init(&sc->sc_bio_queue);
369 kproc_create(&opalflash_task, sc, &sc->sc_p, 0, 0, "task: OPAL Flash");