xref: /freebsd/sys/dev/dpaa2/dpaa2_console.c (revision e1e636193db45630c7881246d25902e57c43d24e) 
1 /*-
2  * SPDX-License-Identifier: BSD-3-Clause AND BSD-2-Clause
3  */
4 /*
5  * // SPDX-License-Identifier: (GPL-2.0+ OR BSD-3-Clause)
6  *
7  * Freescale DPAA2 Platforms Console Driver
8  *
9  * Copyright 2015-2016 Freescale Semiconductor Inc.
10  * Copyright 2018 NXP
11  *
12  * git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/drivers/soc/fsl/dpaa2-console.c#8120bd469f5525da229953c1197f2b826c0109f4
13  */
14 /*
15  * Copyright (c) 2022-2023 Bjoern A. Zeeb
16  *
17  * Redistribution and use in source and binary forms, with or without
18  * modification, are permitted provided that the following conditions
19  * are met:
20  * 1. Redistributions of source code must retain the above copyright
21  *    notice, this list of conditions and the following disclaimer.
22  * 2. Redistributions in binary form must reproduce the above copyright
23  *    notice, this list of conditions and the following disclaimer in the
24  *    documentation and/or other materials provided with the distribution.
25  *
26  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
27  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
28  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
29  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
30  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
31  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
32  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
33  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
34  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
35  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
36  * SUCH DAMAGE.
37  */
38 
39 /*
40  * Some docs are in:
41  * - https://www.nxp.com.cn/docs/en/application-note/AN13329.pdf
42  * - DPAA2UM
43  * - git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/drivers/soc/fsl/dpaa2-console.c
44  */
45 
46 #include "opt_platform.h"
47 #ifdef __notyet__
48 #include "opt_acpi.h"
49 #endif
50 
51 #include <sys/param.h>
52 #include <sys/bus.h>
53 #include <sys/conf.h>
54 #include <sys/fcntl.h>
55 #include <sys/kernel.h>
56 #include <sys/malloc.h>
57 #include <sys/module.h>
58 #include <sys/mutex.h>
59 #include <sys/rman.h>
60 #include <sys/stat.h>
61 #include <sys/uio.h>
62 
63 #include <machine/bus.h>
64 #include <machine/resource.h>
65 
66 #ifdef FDT
67 #include <dev/ofw/ofw_bus.h>
68 #include <dev/ofw/ofw_bus_subr.h>
69 #endif
70 
71 /* Table 6-1. MC Memory Map */
72 #define	MC_REG_MCFBA			0x20
73 #define	MC_REG_MCFBALR_OFF		0x00
74 #define	MC_REG_MCFBALR_MASK		0xe0000000
75 #define	MC_REG_MCFBAHR_OFF		0x04
76 #define	MC_REG_MCFBAHR_MASK		0x0001ffff
77 
78 /* Firmware Consoles. */
79 #define	MC_BUFFER_OFFSET		0x01000000
80 #define	MC_BUFFER_SIZE			(1024 * 1024 * 16)
81 #define	MC_OFFSET_DELTA			MC_BUFFER_OFFSET
82 
83 #define	AIOP_BUFFER_OFFSET		0x06000000
84 #define	AIOP_BUFFER_SIZE		(1024 * 1024 * 16)
85 #define	AIOP_OFFSET_DELTA		0
86 
87 /* MC and AIOP Magic words */
88 #define	MAGIC_MC			0x4d430100
89 #define	MAGIC_AIOP			0X41494f50
90 
91 #define	LOG_HEADER_FLAG_BUFFER_WRAPAROUND				\
92     0x80000000
93 #define	LAST_BYTE(a)							\
94     ((a) & ~(LOG_HEADER_FLAG_BUFFER_WRAPAROUND))
95 
96 struct dpaa2_cons_dev {
97 	struct cdev			*cdev;
98 	struct mtx			mtx;
99 	size_t				offset;
100 	uint32_t			magic;
101 
102 	uint32_t			hdr_magic;
103 	uint32_t			hdr_eobyte;
104 	uint32_t			hdr_start;
105 	uint32_t			hdr_len;
106 
107 	uoff_t				start;
108 	uoff_t				end;
109 	uoff_t				eod;
110 	uoff_t				cur;
111 
112 	bus_space_tag_t			bst;
113 	bus_space_handle_t		bsh;
114 	vm_size_t			size;
115 };
116 
117 struct dpaa2_cons_softc {
118 	struct resource			*res;
119 	bus_space_tag_t			bst;
120 	uint64_t			mcfba;
121 	struct dpaa2_cons_dev		mc_cd;
122 	struct dpaa2_cons_dev		aiop_cd;
123 };
124 
125 struct dpaa2_cons_hdr {
126 	uint32_t	magic;
127 	uint32_t	_reserved;
128 	uint32_t	start;
129 	uint32_t	len;
130 	uint32_t	eobyte;
131 };
132 
133 #define	DPAA2_MC_READ_4(_sc, _r)	bus_read_4((_sc)->res, (_r))
134 
135 /* Management interface */
136 static d_open_t				dpaa2_cons_open;
137 static d_close_t			dpaa2_cons_close;
138 static d_read_t				dpaa2_cons_read;
139 
140 static struct cdevsw dpaa2_mc_cons_cdevsw = {
141 	.d_version =	D_VERSION,
142 	.d_flags =	0,
143 	.d_open =	dpaa2_cons_open,
144 	.d_close =	dpaa2_cons_close,
145 	.d_read =	dpaa2_cons_read,
146 	.d_name =	"fsl_mc_console",
147 };
148 
149 static struct cdevsw dpaa2_aiop_cons_cdevsw = {
150 	.d_version =	D_VERSION,
151 	.d_flags =	0,
152 	.d_open =	dpaa2_cons_open,
153 	.d_close =	dpaa2_cons_close,
154 	.d_read =	dpaa2_cons_read,
155 	.d_name =	"fsl_aiop_console",
156 };
157 
158 static size_t
159 dpaa2_cons_read_bs(struct dpaa2_cons_dev *cd, size_t offset, void *dst, size_t len)
160 {
161 	size_t count, l;
162 	uint8_t *p;
163 
164 	count = 0;
165 	p = dst;
166 	l = offset % 8;
167 	if (l != 0) {
168 		bus_space_read_region_1(cd->bst, cd->bsh, offset + count, p + count, l);
169 		count += l;
170 		len -= l;
171 	}
172 
173 	l = len / 8;
174 	if (l != 0) {
175 		bus_space_read_region_8(cd->bst, cd->bsh, offset + count, (uint64_t *)(p + count), l);
176 		l *= 8;
177 		count += l;
178 		len -= l;
179 	}
180 	l = len / 4;
181 	if (l != 0) {
182 		bus_space_read_region_4(cd->bst, cd->bsh, offset + count, (uint32_t *)(p + count), l);
183 		l *= 4;
184 		count += l;
185 		len -= l;
186 	}
187 	l = len / 2;
188 	if (l != 0) {
189 		bus_space_read_region_2(cd->bst, cd->bsh, offset + count, (uint16_t *)(p + count), l);
190 		l *= 2;
191 		count += l;
192 		len -= l;
193 	}
194 	if (len != 0) {
195 		bus_space_read_region_1(cd->bst, cd->bsh, offset + count, p + count, len);
196 		count += len;
197 	}
198 
199 	return (count);
200 }
201 
202 static int
203 dpaa2_cons_open(struct cdev *cdev, int flags, int fmt, struct thread *td)
204 {
205 	struct dpaa2_cons_dev *cd;
206 	struct dpaa2_cons_hdr hdr;
207 	size_t rlen __diagused;
208 	uint32_t wrapped;
209 
210 	if (flags & FWRITE)
211 		return (EACCES);
212 
213 	cd = cdev->si_drv1;
214 	if (cd->size == 0)
215 		return (ENODEV);
216 
217 	mtx_lock(&cd->mtx);
218 	rlen = dpaa2_cons_read_bs(cd, 0, &hdr, sizeof(hdr));
219 	KASSERT(rlen == sizeof(hdr), ("%s:%d: rlen %zu != count %zu, cdev %p "
220 	    "cd %p\n", __func__, __LINE__, rlen, sizeof(hdr), cdev, cd));
221 
222 	cd->hdr_magic = hdr.magic;
223 	if (cd->hdr_magic != cd->magic) {
224 		mtx_unlock(&cd->mtx);
225 		return (ENODEV);
226 	}
227 
228 	cd->hdr_eobyte = hdr.eobyte;
229 	cd->hdr_start = hdr.start;
230 	cd->hdr_len = hdr.len;
231 
232 	cd->start = cd->hdr_start - cd->offset;
233 	cd->end = cd->start + cd->hdr_len;
234 
235 	wrapped = cd->hdr_eobyte & LOG_HEADER_FLAG_BUFFER_WRAPAROUND;
236 	cd->eod = cd->start + LAST_BYTE(cd->hdr_eobyte);
237 
238 	if (wrapped && cd->eod != cd->end)
239 		cd->cur = cd->eod + 1;
240 	else
241 		cd->cur = cd->start;
242 	mtx_unlock(&cd->mtx);
243 
244 	return (0);
245 }
246 
247 static int
248 dpaa2_cons_close(struct cdev *cdev, int flags, int fmt, struct thread *td)
249 {
250 	struct dpaa2_cons_dev *cd;
251 
252 	cd = cdev->si_drv1;
253 	mtx_lock(&cd->mtx);
254 	cd->hdr_magic = cd->hdr_eobyte = cd->hdr_start = cd->hdr_len = 0;
255 	cd->start = cd->end = 0;
256 	mtx_unlock(&cd->mtx);
257 
258 	return (0);
259 }
260 
261 static int
262 dpaa2_cons_read(struct cdev *cdev, struct uio *uio, int flag)
263 {
264         char buf[128];
265 	struct dpaa2_cons_dev *cd;
266 	size_t len, size, count;
267 	size_t rlen __diagused;
268 	int error;
269 
270 	cd = cdev->si_drv1;
271 	mtx_lock(&cd->mtx);
272 	if (cd->cur == cd->eod) {
273 		mtx_unlock(&cd->mtx);
274 		return (0);
275 	} else if (cd->cur > cd->eod) {
276 		len = (cd->end - cd->cur) + (cd->eod - cd->start);
277 	} else {
278 		len = cd->eod - cd->cur;
279 	}
280 	size = cd->end - cd->cur;
281 
282 	if (len > size) {
283 		/* dump cur [size] */
284 		while (uio->uio_resid > 0) {
285 			count = imin(sizeof(buf), uio->uio_resid);
286 			if (count > size)
287 				count = size;
288 
289 			rlen = dpaa2_cons_read_bs(cd, cd->cur, buf, count);
290 			KASSERT(rlen == count, ("%s:%d: rlen %zu != count %zu, "
291 			    "cdev %p cd %p\n", __func__, __LINE__, rlen, count,
292 			    cdev, cd));
293 
294 			cd->cur += count;
295 			len -= count;
296 			size -= count;
297 			mtx_unlock(&cd->mtx);
298 			error = uiomove(buf, count, uio);
299 			if (error != 0 || uio->uio_resid == 0)
300 				return (error);
301 			mtx_lock(&cd->mtx);
302 		}
303 		cd->cur = cd->start;
304 	}
305 
306 	/* dump cur [len] */
307 	while (len > 0 && uio->uio_resid > 0) {
308 		count = imin(sizeof(buf), uio->uio_resid);
309 		if (count > len)
310 			count = len;
311 
312 		rlen = dpaa2_cons_read_bs(cd, cd->cur, buf, count);
313 		KASSERT(rlen == count, ("%s:%d: rlen %zu != count %zu, cdev %p "
314 		    "cd %p\n", __func__, __LINE__, rlen, count, cdev, cd));
315 
316 		cd->cur += count;
317 		len -= count;
318 		mtx_unlock(&cd->mtx);
319 		error = uiomove(buf, count, uio);
320 		if (error != 0 || uio->uio_resid == 0)
321 			return (error);
322 		mtx_lock(&cd->mtx);
323 	}
324 	mtx_unlock(&cd->mtx);
325 	return (0);
326 }
327 
328 static int
329 dpaa2_cons_create_dev(device_t dev, bus_addr_t pa, size_t size,
330     size_t offset, uint32_t magic, struct cdevsw *devsw,
331     struct dpaa2_cons_dev *cd)
332 {
333 	struct dpaa2_cons_softc *sc;
334 	struct dpaa2_cons_hdr hdr;
335 	struct make_dev_args md_args;
336 	size_t len;
337 	int error;
338 
339 	sc = device_get_softc(dev);
340 
341 	error = bus_space_map(sc->bst, pa, size, 0, &cd->bsh);
342 	if (error != 0) {
343 		device_printf(dev, "%s: failed to map bus space %#jx/%zu: %d\n",
344 		    __func__, (uintmax_t)pa, size, error);
345 		return (error);
346 	}
347 
348 	cd->bst = sc->bst;
349 	cd->size = size;
350 
351 	len = dpaa2_cons_read_bs(cd, 0, &hdr, sizeof(hdr));
352 	if (len != sizeof(hdr)) {
353 		device_printf(dev, "%s: failed to read hdr for %#jx/%zu: %d\n",
354 		    __func__, (uintmax_t)pa, size, error);
355 		bus_space_unmap(cd->bst, cd->bsh, cd->size);
356 		cd->size = 0;
357 		return (EIO);
358 	}
359 
360 	/* This checks probably needs to be removed one day? */
361 	if (hdr.magic != magic) {
362 		if (bootverbose)
363 			device_printf(dev, "%s: magic wrong for %#jx/%zu: "
364 			    "%#010x != %#010x, no console?\n", __func__,
365 			    (uintmax_t)pa, size, hdr.magic, magic);
366 		bus_space_unmap(cd->bst, cd->bsh, cd->size);
367 		cd->size = 0;
368 		return (ENOENT);
369 	}
370 
371 	if (hdr.start - offset > size) {
372 		device_printf(dev, "%s: range wrong for %#jx/%zu: %u - %zu > %zu\n",
373 		    __func__, (uintmax_t)pa, size, hdr.start, offset, size);
374 		bus_space_unmap(cd->bst, cd->bsh, cd->size);
375 		cd->size = 0;
376 		return (ERANGE);
377 	}
378 
379 	cd->offset = offset;
380 	cd->magic = magic;
381 	mtx_init(&cd->mtx, "dpaa2 cons", NULL, MTX_DEF);
382 
383 	make_dev_args_init(&md_args);
384 	md_args.mda_devsw = devsw;
385 	md_args.mda_uid = 0;
386 	md_args.mda_gid = 69;
387 	md_args.mda_mode = S_IRUSR | S_IRGRP;
388 	md_args.mda_unit = 0;
389 	md_args.mda_si_drv1 = cd;
390 	error = make_dev_s(&md_args, &cd->cdev, "%s", devsw->d_name);
391 	if (error != 0) {
392 		device_printf(dev, "%s: make_dev_s failed for %#jx/%zu: %d\n",
393 		    __func__, (uintmax_t)pa, size, error);
394 		mtx_destroy(&cd->mtx);
395 		bus_space_unmap(cd->bst, cd->bsh, cd->size);
396 		cd->size = 0;
397 		return (error);
398 	}
399 
400 	if (bootverbose)
401 		device_printf(dev, "dpaa2 console %s at pa %#jx size %#010zx "
402 		    "(%zu) offset %zu, hdr: magic %#010x start %#010x len "
403 		    "%#010x eobyte %#010x\n", devsw->d_name, (uintmax_t)pa,
404 		    size, size, offset, hdr.magic, hdr.start, hdr.len, hdr.eobyte);
405 
406 	return (0);
407 }
408 
409 static int
410 dpaa2_cons_attach_common(device_t dev)
411 {
412 	struct dpaa2_cons_softc *sc;
413 
414 	sc = device_get_softc(dev);
415 
416 	dpaa2_cons_create_dev(dev, (bus_addr_t)(sc->mcfba + MC_BUFFER_OFFSET),
417 	    MC_BUFFER_SIZE, MC_OFFSET_DELTA, MAGIC_MC,
418 	    &dpaa2_mc_cons_cdevsw, &sc->mc_cd);
419 
420 	dpaa2_cons_create_dev(dev, (bus_addr_t)(sc->mcfba + AIOP_BUFFER_OFFSET),
421 	    AIOP_BUFFER_SIZE, AIOP_OFFSET_DELTA, MAGIC_AIOP,
422 	    &dpaa2_aiop_cons_cdevsw, &sc->aiop_cd);
423 
424 	return (0);
425 }
426 
427 static void
428 dpaa2_cons_detach_common(struct dpaa2_cons_dev *cd)
429 {
430 
431 	bus_space_unmap(cd->bst, cd->bsh, cd->size);
432 	mtx_destroy(&cd->mtx);
433 }
434 
435 static int
436 dpaa2_cons_detach(device_t dev)
437 {
438 	struct dpaa2_cons_softc *sc;
439 
440 	sc = device_get_softc(dev);
441 
442 	if (sc->aiop_cd.cdev != NULL)
443 		destroy_dev(sc->aiop_cd.cdev);
444 	if (sc->mc_cd.cdev != NULL)
445 		destroy_dev(sc->mc_cd.cdev);
446 
447 	if (sc->aiop_cd.size != 0)
448 		dpaa2_cons_detach_common(&sc->aiop_cd);
449 	if (sc->mc_cd.size != 0)
450 		dpaa2_cons_detach_common(&sc->mc_cd);
451 
452 	if (sc->res != NULL)
453 		bus_release_resource(dev, SYS_RES_MEMORY, rman_get_rid(sc->res),
454 		    sc->res);
455 
456 	return (0);
457 }
458 
459 #ifdef __notyet__
460 #ifdef ACPI
461 static int
462 dpaa2_cons_acpi_probe(device_t dev)
463 {
464 
465 	if (!ofw_bus_status_okay(dev))
466 		return (ENXIO);
467 
468 	device_set_desc(dev, "DPAA2 Console Driver");
469 	return (BUS_PROBE_DEFAULT);
470 }
471 
472 static int
473 dpaa2_cons_acpi_attach(device_t dev)
474 {
475 	struct dpaa2_cons_softc *sc;
476 	uint32_t val;
477 	int error, rid;
478 
479 	sc = device_get_softc(dev);
480 
481 	rid = 0;
482 	sc->res = bus_alloc_resource_any(dev, SYS_RES_MEMORY, &rid, RF_ACTIVE);
483 	if (sc->res == NULL) {
484 		device_printf(dev, "Could not allocate memory\n");
485 		return (ENXIO);
486 	}
487 	sc->bst = rman_get_bustag(sc->res);
488 
489 	val = DPAA2_MC_READ_4(sc, MC_REG_MCFBALR_OFF);
490 	val &= MC_REG_MCFBALR_MASK;
491 	sc->mcfba |= val;
492 	val = DPAA2_MC_READ_4(sc, MC_REG_MCFBAHR_OFF);
493 	val &= MC_REG_MCFBAHR_MASK;
494 	sc->mcfba |= ((uint64_t)val << 32);
495 
496 	error = dpaa2_cons_attach_common(dev);
497 
498 	return (error);
499 }
500 
501 static device_method_t dpaa2_cons_acpi_methods[] = {
502 	/* Device interface */
503 	DEVMETHOD(device_probe,		dpaa2_cons_acpi_probe),
504 	DEVMETHOD(device_attach,	dpaa2_cons_acpi_attach),
505 	DEVMETHOD(device_detach,	dpaa2_cons_detach),
506 
507 	DEVMETHOD_END
508 };
509 
510 DEFINE_CLASS_0(dpaa2_cons_acpi, dpaa2_cons_acpi_driver, dpaa2_cons_acpi_methods,
511     sizeof(struct dpaa2_cons_softc));
512 
513 DRIVER_MODULE(dpaa2_cons_acpi, simplebus, dpaa2_cons_acpi_driver, 0, 0);
514 MODULE_DEPEND(dpaa2_cons_acpi, dpaa2_mc, 1, 1, 1);
515 #endif
516 #endif /* 0 */
517 
518 #ifdef FDT
519 static struct ofw_compat_data compat_data[] = {
520 	{ "fsl,dpaa2-console",		1 },
521 	{ NULL,				0 }
522 };
523 
524 static int
525 dpaa2_cons_fdt_probe(device_t dev)
526 {
527 
528 	if (!ofw_bus_status_okay(dev))
529 		return (ENXIO);
530 
531 	if (!ofw_bus_search_compatible(dev, compat_data)->ocd_data)
532 		return (ENXIO);
533 
534 	device_set_desc(dev, "DPAA2 Console Driver");
535 	return (BUS_PROBE_DEFAULT);
536 }
537 
538 static int
539 dpaa2_cons_fdt_attach(device_t dev)
540 {
541 	struct dpaa2_cons_softc *sc;
542 	uint32_t val;
543 	int error, rid;
544 
545 	sc = device_get_softc(dev);
546 
547 	rid = 0;
548 	sc->res = bus_alloc_resource_any(dev, SYS_RES_MEMORY, &rid, RF_ACTIVE);
549 	if (sc->res == NULL) {
550 		device_printf(dev, "Could not allocate memory\n");
551 		return (ENXIO);
552 	}
553 	sc->bst = rman_get_bustag(sc->res);
554 
555 	val = DPAA2_MC_READ_4(sc, MC_REG_MCFBALR_OFF);
556 	val &= MC_REG_MCFBALR_MASK;
557 	sc->mcfba |= val;
558 	val = DPAA2_MC_READ_4(sc, MC_REG_MCFBAHR_OFF);
559 	val &= MC_REG_MCFBAHR_MASK;
560 	sc->mcfba |= ((uint64_t)val << 32);
561 
562 	error = dpaa2_cons_attach_common(dev);
563 
564 	return (error);
565 }
566 
567 static device_method_t dpaa2_cons_fdt_methods[] = {
568 	/* Device interface */
569 	DEVMETHOD(device_probe,		dpaa2_cons_fdt_probe),
570 	DEVMETHOD(device_attach,	dpaa2_cons_fdt_attach),
571 	DEVMETHOD(device_detach,	dpaa2_cons_detach),
572 
573 	DEVMETHOD_END
574 };
575 
576 DEFINE_CLASS_0(dpaa2_cons_fdt, dpaa2_cons_fdt_driver, dpaa2_cons_fdt_methods,
577     sizeof(struct dpaa2_cons_softc));
578 
579 DRIVER_MODULE(dpaa2_cons_fdt, simplebus, dpaa2_cons_fdt_driver, 0, 0);
580 #endif
581