xref: /freebsd/sys/dev/flash/n25q.c (revision aa1a8ff2d6dbc51ef058f46f3db5a8bb77967145) 
1 /*-
2  * Copyright (c) 2009 Oleksandr Tymoshenko.  All rights reserved.
3  * Copyright (c) 2017 Ruslan Bukin <br@bsdpad.com>
4  * Copyright (c) 2018 Ian Lepore.  All rights reserved.
5  * Copyright (c) 2006 M. Warner Losh <imp@FreeBSD.org>
6  *
7  * This software was developed by SRI International and the University of
8  * Cambridge Computer Laboratory under DARPA/AFRL contract FA8750-10-C-0237
9  * ("CTSRD"), as part of the DARPA CRASH research programme.
10  *
11  * Redistribution and use in source and binary forms, with or without
12  * modification, are permitted provided that the following conditions
13  * are met:
14  * 1. Redistributions of source code must retain the above copyright
15  *    notice, this list of conditions and the following disclaimer.
16  * 2. Redistributions in binary form must reproduce the above copyright
17  *    notice, this list of conditions and the following disclaimer in the
18  *    documentation and/or other materials provided with the distribution.
19  *
20  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
21  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
22  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
23  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
24  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
25  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
26  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
27  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
28  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
29  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
30  * SUCH DAMAGE.
31  */
32 
33 /* n25q Quad SPI Flash driver. */
34 
35 #include <sys/cdefs.h>
36 #include "opt_platform.h"
37 
38 #include <sys/param.h>
39 #include <sys/systm.h>
40 #include <sys/bio.h>
41 #include <sys/bus.h>
42 #include <sys/conf.h>
43 #include <sys/kernel.h>
44 #include <sys/kthread.h>
45 #include <sys/lock.h>
46 #include <sys/mbuf.h>
47 #include <sys/malloc.h>
48 #include <sys/module.h>
49 #include <sys/mutex.h>
50 #include <geom/geom_disk.h>
51 
52 #include <machine/bus.h>
53 
54 #include <dev/fdt/fdt_common.h>
55 #include <dev/ofw/ofw_bus_subr.h>
56 #include <dev/ofw/openfirm.h>
57 
58 #include <dev/flash/mx25lreg.h>
59 
60 #include "qspi_if.h"
61 
62 #define	N25Q_DEBUG
63 #undef N25Q_DEBUG
64 
65 #ifdef N25Q_DEBUG
66 #define dprintf(fmt, ...)  printf(fmt, ##__VA_ARGS__)
67 #else
68 #define dprintf(fmt, ...)
69 #endif
70 
71 #define	FL_NONE			0x00
72 #define	FL_ERASE_4K		0x01
73 #define	FL_ERASE_32K		0x02
74 #define	FL_ENABLE_4B_ADDR	0x04
75 #define	FL_DISABLE_4B_ADDR	0x08
76 
77 /*
78  * Define the sectorsize to be a smaller size rather than the flash
79  * sector size. Trying to run FFS off of a 64k flash sector size
80  * results in a completely un-usable system.
81  */
82 #define	FLASH_SECTORSIZE	512
83 
84 struct n25q_flash_ident {
85 	const char	*name;
86 	uint8_t		manufacturer_id;
87 	uint16_t	device_id;
88 	unsigned int	sectorsize;
89 	unsigned int	sectorcount;
90 	unsigned int	flags;
91 };
92 
93 struct n25q_softc {
94 	device_t		dev;
95 	bus_space_tag_t		bst;
96 	bus_space_handle_t	bsh;
97 	void			*ih;
98 	struct resource		*res[3];
99 
100 	uint8_t			sc_manufacturer_id;
101 	uint16_t		device_id;
102 	unsigned int		sc_sectorsize;
103 	struct mtx		sc_mtx;
104 	struct disk		*sc_disk;
105 	struct proc		*sc_p;
106 	struct bio_queue_head	sc_bio_queue;
107 	unsigned int		sc_flags;
108 	unsigned int		sc_taskstate;
109 };
110 
111 #define	TSTATE_STOPPED	0
112 #define	TSTATE_STOPPING	1
113 #define	TSTATE_RUNNING	2
114 
115 #define	N25Q_LOCK(_sc)		mtx_lock(&(_sc)->sc_mtx)
116 #define	N25Q_UNLOCK(_sc)	mtx_unlock(&(_sc)->sc_mtx)
117 #define N25Q_LOCK_INIT(_sc)					\
118 	mtx_init(&_sc->sc_mtx, device_get_nameunit(_sc->dev),	\
119 	    "n25q", MTX_DEF)
120 #define N25Q_LOCK_DESTROY(_sc)	mtx_destroy(&_sc->sc_mtx);
121 #define N25Q_ASSERT_LOCKED(_sc)				\
122 	mtx_assert(&_sc->sc_mtx, MA_OWNED);
123 #define N25Q_ASSERT_UNLOCKED(_sc)				\
124 	mtx_assert(&_sc->sc_mtx, MA_NOTOWNED);
125 
126 static struct ofw_compat_data compat_data[] = {
127 	{ "n25q00aa",		1 },
128 	{ NULL,			0 },
129 };
130 
131 /* disk routines */
132 static int n25q_open(struct disk *dp);
133 static int n25q_close(struct disk *dp);
134 static int n25q_ioctl(struct disk *, u_long, void *, int, struct thread *);
135 static void n25q_strategy(struct bio *bp);
136 static int n25q_getattr(struct bio *bp);
137 static void n25q_task(void *arg);
138 
139 static struct n25q_flash_ident flash_devices[] = {
140 	{ "n25q00", 0x20, 0xbb21, (64 * 1024), 2048, FL_ENABLE_4B_ADDR},
141 };
142 
143 static int
144 n25q_wait_for_device_ready(device_t dev)
145 {
146 	device_t pdev;
147 	uint8_t status;
148 	int err;
149 
150 	pdev = device_get_parent(dev);
151 
152 	do {
153 		err = QSPI_READ_REG(pdev, dev, CMD_READ_STATUS, &status, 1);
154 	} while (err == 0 && (status & STATUS_WIP));
155 
156 	return (err);
157 }
158 
159 static struct n25q_flash_ident*
160 n25q_get_device_ident(struct n25q_softc *sc)
161 {
162 	uint8_t manufacturer_id;
163 	uint16_t dev_id;
164 	device_t pdev;
165 	uint8_t data[4];
166 	int i;
167 
168 	pdev = device_get_parent(sc->dev);
169 
170 	QSPI_READ_REG(pdev, sc->dev, CMD_READ_IDENT, (uint8_t *)&data[0], 4);
171 
172 	manufacturer_id = data[0];
173 	dev_id = (data[1] << 8) | (data[2]);
174 
175 	for (i = 0; i < nitems(flash_devices); i++) {
176 		if ((flash_devices[i].manufacturer_id == manufacturer_id) &&
177 		    (flash_devices[i].device_id == dev_id))
178 			return &flash_devices[i];
179 	}
180 
181 	printf("Unknown SPI flash device. Vendor: %02x, device id: %04x\n",
182 	    manufacturer_id, dev_id);
183 
184 	return (NULL);
185 }
186 
187 static int
188 n25q_write(device_t dev, struct bio *bp, off_t offset, caddr_t data, off_t count)
189 {
190 	device_t pdev;
191 	int err;
192 
193 	pdev = device_get_parent(dev);
194 
195 	dprintf("%s: offset 0x%llx count %lld bytes\n", __func__, offset, count);
196 
197 	err = QSPI_ERASE(pdev, dev, offset);
198 	if (err != 0) {
199 		return (err);
200 	}
201 
202 	err = QSPI_WRITE(pdev, dev, bp, offset, data, count);
203 
204 	return (err);
205 }
206 
207 static int
208 n25q_read(device_t dev, struct bio *bp, off_t offset, caddr_t data, off_t count)
209 {
210 	struct n25q_softc *sc;
211 	device_t pdev;
212 	int err;
213 
214 	pdev = device_get_parent(dev);
215 	sc = device_get_softc(dev);
216 
217 	dprintf("%s: offset 0x%llx count %lld bytes\n", __func__, offset, count);
218 
219 	/*
220 	 * Enforce the disk read sectorsize not the erase sectorsize.
221 	 * In this way, smaller read IO is possible,dramatically
222 	 * speeding up filesystem/geom_compress access.
223 	 */
224 	if (count % sc->sc_disk->d_sectorsize != 0
225 	    || offset % sc->sc_disk->d_sectorsize != 0) {
226 		printf("EIO\n");
227 		return (EIO);
228 	}
229 
230 	err = QSPI_READ(pdev, dev, bp, offset, data, count);
231 
232 	return (err);
233 }
234 
235 static int
236 n25q_set_4b_mode(device_t dev, uint8_t command)
237 {
238 	device_t pdev;
239 	int err;
240 
241 	pdev = device_get_parent(dev);
242 
243 	err = QSPI_WRITE_REG(pdev, dev, command, 0, 0);
244 
245 	return (err);
246 }
247 
248 static int
249 n25q_probe(device_t dev)
250 {
251 	int i;
252 
253 	if (!ofw_bus_status_okay(dev))
254 		return (ENXIO);
255 
256 	/* First try to match the compatible property to the compat_data */
257 	if (ofw_bus_search_compatible(dev, compat_data)->ocd_data == 1)
258 		goto found;
259 
260 	/*
261 	 * Next, try to find a compatible device using the names in the
262 	 * flash_devices structure
263 	 */
264 	for (i = 0; i < nitems(flash_devices); i++)
265 		if (ofw_bus_is_compatible(dev, flash_devices[i].name))
266 			goto found;
267 
268 	return (ENXIO);
269 found:
270 	device_set_desc(dev, "Micron n25q");
271 
272 	return (0);
273 }
274 
275 static int
276 n25q_attach(device_t dev)
277 {
278 	struct n25q_flash_ident *ident;
279 	struct n25q_softc *sc;
280 
281 	sc = device_get_softc(dev);
282 	sc->dev = dev;
283 
284 	N25Q_LOCK_INIT(sc);
285 
286 	ident = n25q_get_device_ident(sc);
287 	if (ident == NULL) {
288 		return (ENXIO);
289 	}
290 
291 	n25q_wait_for_device_ready(sc->dev);
292 
293 	sc->sc_disk = disk_alloc();
294 	sc->sc_disk->d_open = n25q_open;
295 	sc->sc_disk->d_close = n25q_close;
296 	sc->sc_disk->d_strategy = n25q_strategy;
297 	sc->sc_disk->d_getattr = n25q_getattr;
298 	sc->sc_disk->d_ioctl = n25q_ioctl;
299 	sc->sc_disk->d_name = "flash/qspi";
300 	sc->sc_disk->d_drv1 = sc;
301 	sc->sc_disk->d_maxsize = DFLTPHYS;
302 	sc->sc_disk->d_sectorsize = FLASH_SECTORSIZE;
303 	sc->sc_disk->d_mediasize = (ident->sectorsize * ident->sectorcount);
304 	sc->sc_disk->d_unit = device_get_unit(sc->dev);
305 	sc->sc_disk->d_dump = NULL;
306 	/* Sectorsize for erase operations */
307 	sc->sc_sectorsize =  ident->sectorsize;
308 	sc->sc_flags = ident->flags;
309 
310 	if (sc->sc_flags & FL_ENABLE_4B_ADDR)
311 		n25q_set_4b_mode(dev, CMD_ENTER_4B_MODE);
312 
313 	if (sc->sc_flags & FL_DISABLE_4B_ADDR)
314 		n25q_set_4b_mode(dev, CMD_EXIT_4B_MODE);
315 
316         /* NB: use stripesize to hold the erase/region size for RedBoot */
317 	sc->sc_disk->d_stripesize = ident->sectorsize;
318 
319 	disk_create(sc->sc_disk, DISK_VERSION);
320 	bioq_init(&sc->sc_bio_queue);
321 
322 	kproc_create(&n25q_task, sc, &sc->sc_p, 0, 0, "task: n25q flash");
323 	sc->sc_taskstate = TSTATE_RUNNING;
324 
325 	device_printf(sc->dev, "%s, sector %d bytes, %d sectors\n",
326 	    ident->name, ident->sectorsize, ident->sectorcount);
327 
328 	return (0);
329 }
330 
331 static int
332 n25q_detach(device_t dev)
333 {
334 	struct n25q_softc *sc;
335 	int err;
336 
337 	sc = device_get_softc(dev);
338 	err = 0;
339 
340 	N25Q_LOCK(sc);
341 	if (sc->sc_taskstate == TSTATE_RUNNING) {
342 		sc->sc_taskstate = TSTATE_STOPPING;
343 		wakeup(sc);
344 		while (err == 0 && sc->sc_taskstate != TSTATE_STOPPED) {
345 			err = msleep(sc, &sc->sc_mtx, 0, "n25q", hz * 3);
346 			if (err != 0) {
347 				sc->sc_taskstate = TSTATE_RUNNING;
348 				device_printf(sc->dev,
349 				    "Failed to stop queue task\n");
350 			}
351 		}
352 	}
353 	N25Q_UNLOCK(sc);
354 
355 	if (err == 0 && sc->sc_taskstate == TSTATE_STOPPED) {
356 		disk_destroy(sc->sc_disk);
357 		bioq_flush(&sc->sc_bio_queue, NULL, ENXIO);
358 		N25Q_LOCK_DESTROY(sc);
359 	}
360 	return (err);
361 }
362 
363 static int
364 n25q_open(struct disk *dp)
365 {
366 
367 	return (0);
368 }
369 
370 static int
371 n25q_close(struct disk *dp)
372 {
373 
374 	return (0);
375 }
376 
377 static int
378 n25q_ioctl(struct disk *dp, u_long cmd, void *data,
379     int fflag, struct thread *td)
380 {
381 
382 	return (EINVAL);
383 }
384 
385 static void
386 n25q_strategy(struct bio *bp)
387 {
388 	struct n25q_softc *sc;
389 
390 	sc = (struct n25q_softc *)bp->bio_disk->d_drv1;
391 
392 	N25Q_LOCK(sc);
393 	bioq_disksort(&sc->sc_bio_queue, bp);
394 	wakeup(sc);
395 	N25Q_UNLOCK(sc);
396 }
397 
398 static int
399 n25q_getattr(struct bio *bp)
400 {
401 	struct n25q_softc *sc;
402 	device_t dev;
403 
404 	if (bp->bio_disk == NULL || bp->bio_disk->d_drv1 == NULL) {
405 		return (ENXIO);
406 	}
407 
408 	sc = bp->bio_disk->d_drv1;
409 	dev = sc->dev;
410 
411 	if (strcmp(bp->bio_attribute, "SPI::device") == 0) {
412 		if (bp->bio_length != sizeof(dev)) {
413 			return (EFAULT);
414 		}
415 		bcopy(&dev, bp->bio_data, sizeof(dev));
416 		return (0);
417 	}
418 
419 	return (-1);
420 }
421 
422 static void
423 n25q_task(void *arg)
424 {
425 	struct n25q_softc *sc;
426 	struct bio *bp;
427 	device_t dev;
428 
429 	sc = (struct n25q_softc *)arg;
430 
431 	dev = sc->dev;
432 
433 	for (;;) {
434 		N25Q_LOCK(sc);
435 		do {
436 			if (sc->sc_taskstate == TSTATE_STOPPING) {
437 				sc->sc_taskstate = TSTATE_STOPPED;
438 				N25Q_UNLOCK(sc);
439 				wakeup(sc);
440 				kproc_exit(0);
441 			}
442 			bp = bioq_first(&sc->sc_bio_queue);
443 			if (bp == NULL)
444 				msleep(sc, &sc->sc_mtx, PRIBIO, "jobqueue", hz);
445 		} while (bp == NULL);
446 		bioq_remove(&sc->sc_bio_queue, bp);
447 		N25Q_UNLOCK(sc);
448 
449 		switch (bp->bio_cmd) {
450 		case BIO_READ:
451 			bp->bio_error = n25q_read(dev, bp, bp->bio_offset,
452 			    bp->bio_data, bp->bio_bcount);
453 			break;
454 		case BIO_WRITE:
455 			bp->bio_error = n25q_write(dev, bp, bp->bio_offset,
456 			    bp->bio_data, bp->bio_bcount);
457 			break;
458 		default:
459 			bp->bio_error = EOPNOTSUPP;
460 		}
461 
462 		biodone(bp);
463 	}
464 }
465 
466 static device_method_t n25q_methods[] = {
467 	/* Device interface */
468 	DEVMETHOD(device_probe,		n25q_probe),
469 	DEVMETHOD(device_attach,	n25q_attach),
470 	DEVMETHOD(device_detach,	n25q_detach),
471 
472 	{ 0, 0 }
473 };
474 
475 static driver_t n25q_driver = {
476 	"n25q",
477 	n25q_methods,
478 	sizeof(struct n25q_softc),
479 };
480 
481 DRIVER_MODULE(n25q, simplebus, n25q_driver, 0, 0);
482