1 // SPDX-License-Identifier: GPL-2.0+
2 /*
3 * Normal mappings of chips in physical memory
4 *
5 * Copyright (C) 2003 MontaVista Software Inc.
6 * Author: Jun Sun, jsun@mvista.com or jsun@junsun.net
7 *
8 * 031022 - [jsun] add run-time configure and partition setup
9 *
10 * Device tree support:
11 * Copyright (C) 2006 MontaVista Software Inc.
12 * Author: Vitaly Wool <vwool@ru.mvista.com>
13 *
14 * Revised to handle newer style flash binding by:
15 * Copyright (C) 2007 David Gibson, IBM Corporation.
16 *
17 * GPIO address extension:
18 * Handle the case where a flash device is mostly addressed using physical
19 * line and supplemented by GPIOs. This way you can hook up say a 8MiB flash
20 * to a 2MiB memory range and use the GPIOs to select a particular range.
21 *
22 * Copyright © 2000 Nicolas Pitre <nico@cam.org>
23 * Copyright © 2005-2009 Analog Devices Inc.
24 */
25
26 #include <linux/module.h>
27 #include <linux/types.h>
28 #include <linux/kernel.h>
29 #include <linux/init.h>
30 #include <linux/slab.h>
31 #include <linux/device.h>
32 #include <linux/platform_device.h>
33 #include <linux/property.h>
34 #include <linux/mtd/mtd.h>
35 #include <linux/mtd/map.h>
36 #include <linux/mtd/partitions.h>
37 #include <linux/mtd/physmap.h>
38 #include <linux/mtd/concat.h>
39 #include <linux/mtd/cfi_endian.h>
40 #include <linux/io.h>
41 #include <linux/of.h>
42 #include <linux/pm_runtime.h>
43 #include <linux/gpio/consumer.h>
44
45 #include "physmap-bt1-rom.h"
46 #include "physmap-gemini.h"
47 #include "physmap-ixp4xx.h"
48 #include "physmap-versatile.h"
49
50 struct physmap_flash_info {
51 unsigned int nmaps;
52 struct mtd_info **mtds;
53 struct mtd_info *cmtd;
54 struct map_info *maps;
55 spinlock_t vpp_lock;
56 int vpp_refcnt;
57 const char *probe_type;
58 const char * const *part_types;
59 unsigned int nparts;
60 const struct mtd_partition *parts;
61 struct gpio_descs *gpios;
62 unsigned int gpio_values;
63 unsigned int win_order;
64 };
65
physmap_flash_remove(struct platform_device * dev)66 static void physmap_flash_remove(struct platform_device *dev)
67 {
68 struct physmap_flash_info *info;
69 struct physmap_flash_data *physmap_data;
70 int i;
71
72 info = platform_get_drvdata(dev);
73
74 if (info->cmtd) {
75 WARN_ON(mtd_device_unregister(info->cmtd));
76
77 if (info->cmtd != info->mtds[0])
78 mtd_concat_destroy(info->cmtd);
79 }
80
81 for (i = 0; i < info->nmaps; i++) {
82 if (info->mtds[i])
83 map_destroy(info->mtds[i]);
84 }
85
86 physmap_data = dev_get_platdata(&dev->dev);
87 if (physmap_data && physmap_data->exit)
88 physmap_data->exit(dev);
89
90 pm_runtime_put(&dev->dev);
91 pm_runtime_disable(&dev->dev);
92 }
93
physmap_set_vpp(struct map_info * map,int state)94 static void physmap_set_vpp(struct map_info *map, int state)
95 {
96 struct platform_device *pdev;
97 struct physmap_flash_data *physmap_data;
98 struct physmap_flash_info *info;
99 unsigned long flags;
100
101 pdev = (struct platform_device *)map->map_priv_1;
102 physmap_data = dev_get_platdata(&pdev->dev);
103
104 if (!physmap_data->set_vpp)
105 return;
106
107 info = platform_get_drvdata(pdev);
108
109 spin_lock_irqsave(&info->vpp_lock, flags);
110 if (state) {
111 if (++info->vpp_refcnt == 1) /* first nested 'on' */
112 physmap_data->set_vpp(pdev, 1);
113 } else {
114 if (--info->vpp_refcnt == 0) /* last nested 'off' */
115 physmap_data->set_vpp(pdev, 0);
116 }
117 spin_unlock_irqrestore(&info->vpp_lock, flags);
118 }
119
120 #if IS_ENABLED(CONFIG_MTD_PHYSMAP_GPIO_ADDR)
physmap_set_addr_gpios(struct physmap_flash_info * info,unsigned long ofs)121 static void physmap_set_addr_gpios(struct physmap_flash_info *info,
122 unsigned long ofs)
123 {
124 unsigned int i;
125
126 ofs >>= info->win_order;
127 if (info->gpio_values == ofs)
128 return;
129
130 for (i = 0; i < info->gpios->ndescs; i++) {
131 if ((BIT(i) & ofs) == (BIT(i) & info->gpio_values))
132 continue;
133
134 gpiod_set_value(info->gpios->desc[i], !!(BIT(i) & ofs));
135 }
136
137 info->gpio_values = ofs;
138 }
139
140 #define win_mask(order) (BIT(order) - 1)
141
physmap_addr_gpios_read(struct map_info * map,unsigned long ofs)142 static map_word physmap_addr_gpios_read(struct map_info *map,
143 unsigned long ofs)
144 {
145 struct platform_device *pdev;
146 struct physmap_flash_info *info;
147 map_word mw;
148 u16 word;
149
150 pdev = (struct platform_device *)map->map_priv_1;
151 info = platform_get_drvdata(pdev);
152 physmap_set_addr_gpios(info, ofs);
153
154 word = readw(map->virt + (ofs & win_mask(info->win_order)));
155 mw.x[0] = word;
156 return mw;
157 }
158
physmap_addr_gpios_copy_from(struct map_info * map,void * buf,unsigned long ofs,ssize_t len)159 static void physmap_addr_gpios_copy_from(struct map_info *map, void *buf,
160 unsigned long ofs, ssize_t len)
161 {
162 struct platform_device *pdev;
163 struct physmap_flash_info *info;
164
165 pdev = (struct platform_device *)map->map_priv_1;
166 info = platform_get_drvdata(pdev);
167
168 while (len) {
169 unsigned int winofs = ofs & win_mask(info->win_order);
170 unsigned int chunklen = min_t(unsigned int, len,
171 BIT(info->win_order) - winofs);
172
173 physmap_set_addr_gpios(info, ofs);
174 memcpy_fromio(buf, map->virt + winofs, chunklen);
175 len -= chunklen;
176 buf += chunklen;
177 ofs += chunklen;
178 }
179 }
180
physmap_addr_gpios_write(struct map_info * map,map_word mw,unsigned long ofs)181 static void physmap_addr_gpios_write(struct map_info *map, map_word mw,
182 unsigned long ofs)
183 {
184 struct platform_device *pdev;
185 struct physmap_flash_info *info;
186 u16 word;
187
188 pdev = (struct platform_device *)map->map_priv_1;
189 info = platform_get_drvdata(pdev);
190 physmap_set_addr_gpios(info, ofs);
191
192 word = mw.x[0];
193 writew(word, map->virt + (ofs & win_mask(info->win_order)));
194 }
195
physmap_addr_gpios_copy_to(struct map_info * map,unsigned long ofs,const void * buf,ssize_t len)196 static void physmap_addr_gpios_copy_to(struct map_info *map, unsigned long ofs,
197 const void *buf, ssize_t len)
198 {
199 struct platform_device *pdev;
200 struct physmap_flash_info *info;
201
202 pdev = (struct platform_device *)map->map_priv_1;
203 info = platform_get_drvdata(pdev);
204
205 while (len) {
206 unsigned int winofs = ofs & win_mask(info->win_order);
207 unsigned int chunklen = min_t(unsigned int, len,
208 BIT(info->win_order) - winofs);
209
210 physmap_set_addr_gpios(info, ofs);
211 memcpy_toio(map->virt + winofs, buf, chunklen);
212 len -= chunklen;
213 buf += chunklen;
214 ofs += chunklen;
215 }
216 }
217
physmap_addr_gpios_map_init(struct map_info * map)218 static int physmap_addr_gpios_map_init(struct map_info *map)
219 {
220 map->phys = NO_XIP;
221 map->read = physmap_addr_gpios_read;
222 map->copy_from = physmap_addr_gpios_copy_from;
223 map->write = physmap_addr_gpios_write;
224 map->copy_to = physmap_addr_gpios_copy_to;
225
226 return 0;
227 }
228 #else
physmap_addr_gpios_map_init(struct map_info * map)229 static int physmap_addr_gpios_map_init(struct map_info *map)
230 {
231 return -ENOTSUPP;
232 }
233 #endif
234
235 #if IS_ENABLED(CONFIG_MTD_PHYSMAP_OF)
236 static const struct of_device_id of_flash_match[] = {
237 {
238 .compatible = "cfi-flash",
239 .data = "cfi_probe",
240 },
241 {
242 /*
243 * FIXME: JEDEC chips can't be safely and reliably
244 * probed, although the mtd code gets it right in
245 * practice most of the time. We should use the
246 * vendor and device ids specified by the binding to
247 * bypass the heuristic probe code, but the mtd layer
248 * provides, at present, no interface for doing so
249 * :(.
250 */
251 .compatible = "jedec-flash",
252 .data = "jedec_probe",
253 },
254 {
255 .compatible = "mtd-ram",
256 .data = "map_ram",
257 },
258 {
259 .compatible = "mtd-rom",
260 .data = "map_rom",
261 },
262 {
263 .type = "rom",
264 .compatible = "direct-mapped"
265 },
266 { /* sentinel */ },
267 };
268 MODULE_DEVICE_TABLE(of, of_flash_match);
269
270 static const char * const of_default_part_probes[] = {
271 "cmdlinepart", "RedBoot", "ofpart", "ofoldpart", NULL
272 };
273
of_get_part_probes(struct platform_device * dev)274 static const char * const *of_get_part_probes(struct platform_device *dev)
275 {
276 struct device_node *dp = dev->dev.of_node;
277 const char **res;
278 int count;
279
280 count = of_property_count_strings(dp, "linux,part-probe");
281 if (count < 0)
282 return of_default_part_probes;
283
284 res = devm_kcalloc(&dev->dev, count + 1, sizeof(*res), GFP_KERNEL);
285 if (!res)
286 return NULL;
287
288 count = of_property_read_string_array(dp, "linux,part-probe", res,
289 count);
290 if (count < 0)
291 return NULL;
292
293 return res;
294 }
295
of_select_probe_type(struct platform_device * dev)296 static const char *of_select_probe_type(struct platform_device *dev)
297 {
298 struct device_node *dp = dev->dev.of_node;
299 const char *probe_type;
300
301 probe_type = device_get_match_data(&dev->dev);
302 if (probe_type)
303 return probe_type;
304
305 dev_warn(&dev->dev,
306 "Device tree uses obsolete \"direct-mapped\" flash binding\n");
307
308 of_property_read_string(dp, "probe-type", &probe_type);
309 if (!probe_type)
310 return NULL;
311
312 if (!strcmp(probe_type, "CFI")) {
313 probe_type = "cfi_probe";
314 } else if (!strcmp(probe_type, "JEDEC")) {
315 probe_type = "jedec_probe";
316 } else if (!strcmp(probe_type, "ROM")) {
317 probe_type = "map_rom";
318 } else {
319 dev_warn(&dev->dev,
320 "obsolete_probe: don't know probe type '%s', mapping as rom\n",
321 probe_type);
322 probe_type = "map_rom";
323 }
324
325 return probe_type;
326 }
327
physmap_flash_of_init(struct platform_device * dev)328 static int physmap_flash_of_init(struct platform_device *dev)
329 {
330 struct physmap_flash_info *info = platform_get_drvdata(dev);
331 struct device_node *dp = dev->dev.of_node;
332 const char *mtd_name = NULL;
333 int err, swap = 0;
334 bool map_indirect;
335 unsigned int i;
336 u32 bankwidth;
337
338 if (!dp)
339 return -EINVAL;
340
341 info->probe_type = of_select_probe_type(dev);
342
343 info->part_types = of_get_part_probes(dev);
344 if (!info->part_types)
345 return -ENOMEM;
346
347 of_property_read_string(dp, "linux,mtd-name", &mtd_name);
348
349 map_indirect = of_property_read_bool(dp, "no-unaligned-direct-access");
350
351 err = of_property_read_u32(dp, "bank-width", &bankwidth);
352 if (err) {
353 dev_err(&dev->dev, "Can't get bank width from device tree\n");
354 return err;
355 }
356
357 if (of_property_read_bool(dp, "big-endian"))
358 swap = CFI_BIG_ENDIAN;
359 else if (of_property_read_bool(dp, "little-endian"))
360 swap = CFI_LITTLE_ENDIAN;
361
362 for (i = 0; i < info->nmaps; i++) {
363 info->maps[i].name = mtd_name;
364 info->maps[i].swap = swap;
365 info->maps[i].bankwidth = bankwidth;
366 info->maps[i].device_node = dp;
367
368 err = of_flash_probe_bt1_rom(dev, dp, &info->maps[i]);
369 if (err)
370 return err;
371
372 err = of_flash_probe_gemini(dev, dp, &info->maps[i]);
373 if (err)
374 return err;
375
376 err = of_flash_probe_ixp4xx(dev, dp, &info->maps[i]);
377 if (err)
378 return err;
379
380 err = of_flash_probe_versatile(dev, dp, &info->maps[i]);
381 if (err)
382 return err;
383
384 /*
385 * On some platforms (e.g. MPC5200) a direct 1:1 mapping
386 * may cause problems with JFFS2 usage, as the local bus (LPB)
387 * doesn't support unaligned accesses as implemented in the
388 * JFFS2 code via memcpy(). By setting NO_XIP, the
389 * flash will not be exposed directly to the MTD users
390 * (e.g. JFFS2) any more.
391 */
392 if (map_indirect)
393 info->maps[i].phys = NO_XIP;
394 }
395
396 return 0;
397 }
398 #else /* IS_ENABLED(CONFIG_MTD_PHYSMAP_OF) */
399 #define of_flash_match NULL
400
physmap_flash_of_init(struct platform_device * dev)401 static int physmap_flash_of_init(struct platform_device *dev)
402 {
403 return -ENOTSUPP;
404 }
405 #endif /* IS_ENABLED(CONFIG_MTD_PHYSMAP_OF) */
406
407 static const char * const rom_probe_types[] = {
408 "cfi_probe", "jedec_probe", "qinfo_probe", "map_rom",
409 };
410
411 static const char * const part_probe_types[] = {
412 "cmdlinepart", "RedBoot", "afs", NULL
413 };
414
physmap_flash_pdata_init(struct platform_device * dev)415 static int physmap_flash_pdata_init(struct platform_device *dev)
416 {
417 struct physmap_flash_info *info = platform_get_drvdata(dev);
418 struct physmap_flash_data *physmap_data;
419 unsigned int i;
420 int err;
421
422 physmap_data = dev_get_platdata(&dev->dev);
423 if (!physmap_data)
424 return -EINVAL;
425
426 info->probe_type = physmap_data->probe_type;
427 info->part_types = physmap_data->part_probe_types ? : part_probe_types;
428 info->parts = physmap_data->parts;
429 info->nparts = physmap_data->nr_parts;
430
431 if (physmap_data->init) {
432 err = physmap_data->init(dev);
433 if (err)
434 return err;
435 }
436
437 for (i = 0; i < info->nmaps; i++) {
438 info->maps[i].bankwidth = physmap_data->width;
439 info->maps[i].pfow_base = physmap_data->pfow_base;
440 info->maps[i].set_vpp = physmap_set_vpp;
441 }
442
443 return 0;
444 }
445
physmap_flash_probe(struct platform_device * dev)446 static int physmap_flash_probe(struct platform_device *dev)
447 {
448 struct physmap_flash_info *info;
449 int err = 0;
450 int i;
451
452 if (!dev->dev.of_node && !dev_get_platdata(&dev->dev))
453 return -EINVAL;
454
455 info = devm_kzalloc(&dev->dev, sizeof(*info), GFP_KERNEL);
456 if (!info)
457 return -ENOMEM;
458
459 while (platform_get_resource(dev, IORESOURCE_MEM, info->nmaps))
460 info->nmaps++;
461
462 if (!info->nmaps)
463 return -ENODEV;
464
465 info->maps = devm_kzalloc(&dev->dev,
466 sizeof(*info->maps) * info->nmaps,
467 GFP_KERNEL);
468 if (!info->maps)
469 return -ENOMEM;
470
471 info->mtds = devm_kzalloc(&dev->dev,
472 sizeof(*info->mtds) * info->nmaps,
473 GFP_KERNEL);
474 if (!info->mtds)
475 return -ENOMEM;
476
477 platform_set_drvdata(dev, info);
478
479 info->gpios = devm_gpiod_get_array_optional(&dev->dev, "addr",
480 GPIOD_OUT_LOW);
481 if (IS_ERR(info->gpios))
482 return PTR_ERR(info->gpios);
483
484 if (info->gpios && info->nmaps > 1) {
485 dev_err(&dev->dev, "addr-gpios only supported for nmaps == 1\n");
486 return -EINVAL;
487 }
488
489 pm_runtime_enable(&dev->dev);
490 pm_runtime_get_sync(&dev->dev);
491
492 if (dev->dev.of_node)
493 err = physmap_flash_of_init(dev);
494 else
495 err = physmap_flash_pdata_init(dev);
496
497 if (err) {
498 pm_runtime_put(&dev->dev);
499 pm_runtime_disable(&dev->dev);
500 return err;
501 }
502
503 for (i = 0; i < info->nmaps; i++) {
504 struct resource *res;
505
506 info->maps[i].virt = devm_platform_get_and_ioremap_resource(dev, i, &res);
507 if (IS_ERR(info->maps[i].virt)) {
508 err = PTR_ERR(info->maps[i].virt);
509 goto err_out;
510 }
511
512 dev_notice(&dev->dev, "physmap platform flash device: %pR\n",
513 res);
514
515 if (!info->maps[i].name)
516 info->maps[i].name = dev_name(&dev->dev);
517
518 if (!info->maps[i].phys)
519 info->maps[i].phys = res->start;
520
521 info->win_order = fls64(resource_size(res)) - 1;
522 info->maps[i].size = BIT(info->win_order +
523 (info->gpios ?
524 info->gpios->ndescs : 0));
525
526 info->maps[i].map_priv_1 = (unsigned long)dev;
527
528 if (info->gpios) {
529 err = physmap_addr_gpios_map_init(&info->maps[i]);
530 if (err)
531 goto err_out;
532 }
533
534 #ifdef CONFIG_MTD_COMPLEX_MAPPINGS
535 /*
536 * Only use the simple_map implementation if map hooks are not
537 * implemented. Since map->read() is mandatory checking for its
538 * presence is enough.
539 */
540 if (!info->maps[i].read)
541 simple_map_init(&info->maps[i]);
542 #else
543 simple_map_init(&info->maps[i]);
544 #endif
545
546 if (info->probe_type) {
547 info->mtds[i] = do_map_probe(info->probe_type,
548 &info->maps[i]);
549
550 /* Fall back to mapping region as ROM */
551 if (!info->mtds[i] && IS_ENABLED(CONFIG_MTD_ROM) &&
552 strcmp(info->probe_type, "map_rom")) {
553 dev_warn(&dev->dev,
554 "map_probe() failed for type %s\n",
555 info->probe_type);
556
557 info->mtds[i] = do_map_probe("map_rom",
558 &info->maps[i]);
559 }
560 } else {
561 int j;
562
563 for (j = 0; j < ARRAY_SIZE(rom_probe_types); j++) {
564 info->mtds[i] = do_map_probe(rom_probe_types[j],
565 &info->maps[i]);
566 if (info->mtds[i])
567 break;
568 }
569 }
570
571 if (!info->mtds[i]) {
572 dev_err(&dev->dev, "map_probe failed\n");
573 err = -ENXIO;
574 goto err_out;
575 }
576 info->mtds[i]->dev.parent = &dev->dev;
577 }
578
579 if (info->nmaps == 1) {
580 info->cmtd = info->mtds[0];
581 } else {
582 /*
583 * We detected multiple devices. Concatenate them together.
584 */
585 info->cmtd = mtd_concat_create(info->mtds, info->nmaps,
586 dev_name(&dev->dev));
587 if (!info->cmtd)
588 err = -ENXIO;
589 }
590 if (err)
591 goto err_out;
592
593 spin_lock_init(&info->vpp_lock);
594
595 mtd_set_of_node(info->cmtd, dev->dev.of_node);
596 err = mtd_device_parse_register(info->cmtd, info->part_types, NULL,
597 info->parts, info->nparts);
598 if (err)
599 goto err_out;
600
601 return 0;
602
603 err_out:
604 physmap_flash_remove(dev);
605 return err;
606 }
607
608 #ifdef CONFIG_PM
physmap_flash_shutdown(struct platform_device * dev)609 static void physmap_flash_shutdown(struct platform_device *dev)
610 {
611 struct physmap_flash_info *info = platform_get_drvdata(dev);
612 int i;
613
614 for (i = 0; i < info->nmaps && info->mtds[i]; i++)
615 if (mtd_suspend(info->mtds[i]) == 0)
616 mtd_resume(info->mtds[i]);
617 }
618 #else
619 #define physmap_flash_shutdown NULL
620 #endif
621
622 static struct platform_driver physmap_flash_driver = {
623 .probe = physmap_flash_probe,
624 .remove = physmap_flash_remove,
625 .shutdown = physmap_flash_shutdown,
626 .driver = {
627 .name = "physmap-flash",
628 .of_match_table = of_flash_match,
629 },
630 };
631
632 #ifdef CONFIG_MTD_PHYSMAP_COMPAT
633 static struct physmap_flash_data physmap_flash_data = {
634 .width = CONFIG_MTD_PHYSMAP_BANKWIDTH,
635 };
636
637 static struct resource physmap_flash_resource = {
638 .start = CONFIG_MTD_PHYSMAP_START,
639 .end = CONFIG_MTD_PHYSMAP_START + CONFIG_MTD_PHYSMAP_LEN - 1,
640 .flags = IORESOURCE_MEM,
641 };
642
643 static struct platform_device physmap_flash = {
644 .name = "physmap-flash",
645 .id = 0,
646 .dev = {
647 .platform_data = &physmap_flash_data,
648 },
649 .num_resources = 1,
650 .resource = &physmap_flash_resource,
651 };
652 #endif
653
physmap_init(void)654 static int __init physmap_init(void)
655 {
656 int err;
657
658 err = platform_driver_register(&physmap_flash_driver);
659 #ifdef CONFIG_MTD_PHYSMAP_COMPAT
660 if (err == 0) {
661 err = platform_device_register(&physmap_flash);
662 if (err)
663 platform_driver_unregister(&physmap_flash_driver);
664 }
665 #endif
666
667 return err;
668 }
669
physmap_exit(void)670 static void __exit physmap_exit(void)
671 {
672 #ifdef CONFIG_MTD_PHYSMAP_COMPAT
673 platform_device_unregister(&physmap_flash);
674 #endif
675 platform_driver_unregister(&physmap_flash_driver);
676 }
677
678 module_init(physmap_init);
679 module_exit(physmap_exit);
680
681 MODULE_LICENSE("GPL");
682 MODULE_AUTHOR("David Woodhouse <dwmw2@infradead.org>");
683 MODULE_AUTHOR("Vitaly Wool <vwool@ru.mvista.com>");
684 MODULE_AUTHOR("Mike Frysinger <vapier@gentoo.org>");
685 MODULE_DESCRIPTION("Generic configurable MTD map driver");
686
687 /* legacy platform drivers can't hotplug or coldplg */
688 #ifndef CONFIG_MTD_PHYSMAP_COMPAT
689 /* work with hotplug and coldplug */
690 MODULE_ALIAS("platform:physmap-flash");
691 #endif
692