xref: /openbmc/linux/include/linux/mtd/map.h (revision 93d90ad7)
1 /*
2  * Copyright © 2000-2010 David Woodhouse <dwmw2@infradead.org> et al.
3  *
4  * This program is free software; you can redistribute it and/or modify
5  * it under the terms of the GNU General Public License as published by
6  * the Free Software Foundation; either version 2 of the License, or
7  * (at your option) any later version.
8  *
9  * This program is distributed in the hope that it will be useful,
10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
12  * GNU General Public License for more details.
13  *
14  * You should have received a copy of the GNU General Public License
15  * along with this program; if not, write to the Free Software
16  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
17  *
18  */
19 
20 /* Overhauled routines for dealing with different mmap regions of flash */
21 
22 #ifndef __LINUX_MTD_MAP_H__
23 #define __LINUX_MTD_MAP_H__
24 
25 #include <linux/types.h>
26 #include <linux/list.h>
27 #include <linux/string.h>
28 #include <linux/bug.h>
29 #include <linux/kernel.h>
30 
31 #include <asm/unaligned.h>
32 #include <asm/io.h>
33 #include <asm/barrier.h>
34 
35 #ifdef CONFIG_MTD_MAP_BANK_WIDTH_1
36 #define map_bankwidth(map) 1
37 #define map_bankwidth_is_1(map) (map_bankwidth(map) == 1)
38 #define map_bankwidth_is_large(map) (0)
39 #define map_words(map) (1)
40 #define MAX_MAP_BANKWIDTH 1
41 #else
42 #define map_bankwidth_is_1(map) (0)
43 #endif
44 
45 #ifdef CONFIG_MTD_MAP_BANK_WIDTH_2
46 # ifdef map_bankwidth
47 #  undef map_bankwidth
48 #  define map_bankwidth(map) ((map)->bankwidth)
49 # else
50 #  define map_bankwidth(map) 2
51 #  define map_bankwidth_is_large(map) (0)
52 #  define map_words(map) (1)
53 # endif
54 #define map_bankwidth_is_2(map) (map_bankwidth(map) == 2)
55 #undef MAX_MAP_BANKWIDTH
56 #define MAX_MAP_BANKWIDTH 2
57 #else
58 #define map_bankwidth_is_2(map) (0)
59 #endif
60 
61 #ifdef CONFIG_MTD_MAP_BANK_WIDTH_4
62 # ifdef map_bankwidth
63 #  undef map_bankwidth
64 #  define map_bankwidth(map) ((map)->bankwidth)
65 # else
66 #  define map_bankwidth(map) 4
67 #  define map_bankwidth_is_large(map) (0)
68 #  define map_words(map) (1)
69 # endif
70 #define map_bankwidth_is_4(map) (map_bankwidth(map) == 4)
71 #undef MAX_MAP_BANKWIDTH
72 #define MAX_MAP_BANKWIDTH 4
73 #else
74 #define map_bankwidth_is_4(map) (0)
75 #endif
76 
77 /* ensure we never evaluate anything shorted than an unsigned long
78  * to zero, and ensure we'll never miss the end of an comparison (bjd) */
79 
80 #define map_calc_words(map) ((map_bankwidth(map) + (sizeof(unsigned long)-1))/ sizeof(unsigned long))
81 
82 #ifdef CONFIG_MTD_MAP_BANK_WIDTH_8
83 # ifdef map_bankwidth
84 #  undef map_bankwidth
85 #  define map_bankwidth(map) ((map)->bankwidth)
86 #  if BITS_PER_LONG < 64
87 #   undef map_bankwidth_is_large
88 #   define map_bankwidth_is_large(map) (map_bankwidth(map) > BITS_PER_LONG/8)
89 #   undef map_words
90 #   define map_words(map) map_calc_words(map)
91 #  endif
92 # else
93 #  define map_bankwidth(map) 8
94 #  define map_bankwidth_is_large(map) (BITS_PER_LONG < 64)
95 #  define map_words(map) map_calc_words(map)
96 # endif
97 #define map_bankwidth_is_8(map) (map_bankwidth(map) == 8)
98 #undef MAX_MAP_BANKWIDTH
99 #define MAX_MAP_BANKWIDTH 8
100 #else
101 #define map_bankwidth_is_8(map) (0)
102 #endif
103 
104 #ifdef CONFIG_MTD_MAP_BANK_WIDTH_16
105 # ifdef map_bankwidth
106 #  undef map_bankwidth
107 #  define map_bankwidth(map) ((map)->bankwidth)
108 #  undef map_bankwidth_is_large
109 #  define map_bankwidth_is_large(map) (map_bankwidth(map) > BITS_PER_LONG/8)
110 #  undef map_words
111 #  define map_words(map) map_calc_words(map)
112 # else
113 #  define map_bankwidth(map) 16
114 #  define map_bankwidth_is_large(map) (1)
115 #  define map_words(map) map_calc_words(map)
116 # endif
117 #define map_bankwidth_is_16(map) (map_bankwidth(map) == 16)
118 #undef MAX_MAP_BANKWIDTH
119 #define MAX_MAP_BANKWIDTH 16
120 #else
121 #define map_bankwidth_is_16(map) (0)
122 #endif
123 
124 #ifdef CONFIG_MTD_MAP_BANK_WIDTH_32
125 # ifdef map_bankwidth
126 #  undef map_bankwidth
127 #  define map_bankwidth(map) ((map)->bankwidth)
128 #  undef map_bankwidth_is_large
129 #  define map_bankwidth_is_large(map) (map_bankwidth(map) > BITS_PER_LONG/8)
130 #  undef map_words
131 #  define map_words(map) map_calc_words(map)
132 # else
133 #  define map_bankwidth(map) 32
134 #  define map_bankwidth_is_large(map) (1)
135 #  define map_words(map) map_calc_words(map)
136 # endif
137 #define map_bankwidth_is_32(map) (map_bankwidth(map) == 32)
138 #undef MAX_MAP_BANKWIDTH
139 #define MAX_MAP_BANKWIDTH 32
140 #else
141 #define map_bankwidth_is_32(map) (0)
142 #endif
143 
144 #ifndef map_bankwidth
145 #warning "No CONFIG_MTD_MAP_BANK_WIDTH_xx selected. No NOR chip support can work"
146 static inline int map_bankwidth(void *map)
147 {
148 	BUG();
149 	return 0;
150 }
151 #define map_bankwidth_is_large(map) (0)
152 #define map_words(map) (0)
153 #define MAX_MAP_BANKWIDTH 1
154 #endif
155 
156 static inline int map_bankwidth_supported(int w)
157 {
158 	switch (w) {
159 #ifdef CONFIG_MTD_MAP_BANK_WIDTH_1
160 	case 1:
161 #endif
162 #ifdef CONFIG_MTD_MAP_BANK_WIDTH_2
163 	case 2:
164 #endif
165 #ifdef CONFIG_MTD_MAP_BANK_WIDTH_4
166 	case 4:
167 #endif
168 #ifdef CONFIG_MTD_MAP_BANK_WIDTH_8
169 	case 8:
170 #endif
171 #ifdef CONFIG_MTD_MAP_BANK_WIDTH_16
172 	case 16:
173 #endif
174 #ifdef CONFIG_MTD_MAP_BANK_WIDTH_32
175 	case 32:
176 #endif
177 		return 1;
178 
179 	default:
180 		return 0;
181 	}
182 }
183 
184 #define MAX_MAP_LONGS ( ((MAX_MAP_BANKWIDTH*8) + BITS_PER_LONG - 1) / BITS_PER_LONG )
185 
186 typedef union {
187 	unsigned long x[MAX_MAP_LONGS];
188 } map_word;
189 
190 /* The map stuff is very simple. You fill in your struct map_info with
191    a handful of routines for accessing the device, making sure they handle
192    paging etc. correctly if your device needs it. Then you pass it off
193    to a chip probe routine -- either JEDEC or CFI probe or both -- via
194    do_map_probe(). If a chip is recognised, the probe code will invoke the
195    appropriate chip driver (if present) and return a struct mtd_info.
196    At which point, you fill in the mtd->module with your own module
197    address, and register it with the MTD core code. Or you could partition
198    it and register the partitions instead, or keep it for your own private
199    use; whatever.
200 
201    The mtd->priv field will point to the struct map_info, and any further
202    private data required by the chip driver is linked from the
203    mtd->priv->fldrv_priv field. This allows the map driver to get at
204    the destructor function map->fldrv_destroy() when it's tired
205    of living.
206 */
207 
208 struct map_info {
209 	const char *name;
210 	unsigned long size;
211 	resource_size_t phys;
212 #define NO_XIP (-1UL)
213 
214 	void __iomem *virt;
215 	void *cached;
216 
217 	int swap; /* this mapping's byte-swapping requirement */
218 	int bankwidth; /* in octets. This isn't necessarily the width
219 		       of actual bus cycles -- it's the repeat interval
220 		      in bytes, before you are talking to the first chip again.
221 		      */
222 
223 #ifdef CONFIG_MTD_COMPLEX_MAPPINGS
224 	map_word (*read)(struct map_info *, unsigned long);
225 	void (*copy_from)(struct map_info *, void *, unsigned long, ssize_t);
226 
227 	void (*write)(struct map_info *, const map_word, unsigned long);
228 	void (*copy_to)(struct map_info *, unsigned long, const void *, ssize_t);
229 
230 	/* We can perhaps put in 'point' and 'unpoint' methods, if we really
231 	   want to enable XIP for non-linear mappings. Not yet though. */
232 #endif
233 	/* It's possible for the map driver to use cached memory in its
234 	   copy_from implementation (and _only_ with copy_from).  However,
235 	   when the chip driver knows some flash area has changed contents,
236 	   it will signal it to the map driver through this routine to let
237 	   the map driver invalidate the corresponding cache as needed.
238 	   If there is no cache to care about this can be set to NULL. */
239 	void (*inval_cache)(struct map_info *, unsigned long, ssize_t);
240 
241 	/* set_vpp() must handle being reentered -- enable, enable, disable
242 	   must leave it enabled. */
243 	void (*set_vpp)(struct map_info *, int);
244 
245 	unsigned long pfow_base;
246 	unsigned long map_priv_1;
247 	unsigned long map_priv_2;
248 	struct device_node *device_node;
249 	void *fldrv_priv;
250 	struct mtd_chip_driver *fldrv;
251 };
252 
253 struct mtd_chip_driver {
254 	struct mtd_info *(*probe)(struct map_info *map);
255 	void (*destroy)(struct mtd_info *);
256 	struct module *module;
257 	char *name;
258 	struct list_head list;
259 };
260 
261 void register_mtd_chip_driver(struct mtd_chip_driver *);
262 void unregister_mtd_chip_driver(struct mtd_chip_driver *);
263 
264 struct mtd_info *do_map_probe(const char *name, struct map_info *map);
265 void map_destroy(struct mtd_info *mtd);
266 
267 #define ENABLE_VPP(map) do { if(map->set_vpp) map->set_vpp(map, 1); } while(0)
268 #define DISABLE_VPP(map) do { if(map->set_vpp) map->set_vpp(map, 0); } while(0)
269 
270 #define INVALIDATE_CACHED_RANGE(map, from, size) \
271 	do { if(map->inval_cache) map->inval_cache(map, from, size); } while(0)
272 
273 
274 static inline int map_word_equal(struct map_info *map, map_word val1, map_word val2)
275 {
276 	int i;
277 	for (i=0; i<map_words(map); i++) {
278 		if (val1.x[i] != val2.x[i])
279 			return 0;
280 	}
281 	return 1;
282 }
283 
284 static inline map_word map_word_and(struct map_info *map, map_word val1, map_word val2)
285 {
286 	map_word r;
287 	int i;
288 
289 	for (i=0; i<map_words(map); i++) {
290 		r.x[i] = val1.x[i] & val2.x[i];
291 	}
292 	return r;
293 }
294 
295 static inline map_word map_word_clr(struct map_info *map, map_word val1, map_word val2)
296 {
297 	map_word r;
298 	int i;
299 
300 	for (i=0; i<map_words(map); i++) {
301 		r.x[i] = val1.x[i] & ~val2.x[i];
302 	}
303 	return r;
304 }
305 
306 static inline map_word map_word_or(struct map_info *map, map_word val1, map_word val2)
307 {
308 	map_word r;
309 	int i;
310 
311 	for (i=0; i<map_words(map); i++) {
312 		r.x[i] = val1.x[i] | val2.x[i];
313 	}
314 	return r;
315 }
316 
317 #define map_word_andequal(m, a, b, z) map_word_equal(m, z, map_word_and(m, a, b))
318 
319 static inline int map_word_bitsset(struct map_info *map, map_word val1, map_word val2)
320 {
321 	int i;
322 
323 	for (i=0; i<map_words(map); i++) {
324 		if (val1.x[i] & val2.x[i])
325 			return 1;
326 	}
327 	return 0;
328 }
329 
330 static inline map_word map_word_load(struct map_info *map, const void *ptr)
331 {
332 	map_word r;
333 
334 	if (map_bankwidth_is_1(map))
335 		r.x[0] = *(unsigned char *)ptr;
336 	else if (map_bankwidth_is_2(map))
337 		r.x[0] = get_unaligned((uint16_t *)ptr);
338 	else if (map_bankwidth_is_4(map))
339 		r.x[0] = get_unaligned((uint32_t *)ptr);
340 #if BITS_PER_LONG >= 64
341 	else if (map_bankwidth_is_8(map))
342 		r.x[0] = get_unaligned((uint64_t *)ptr);
343 #endif
344 	else if (map_bankwidth_is_large(map))
345 		memcpy(r.x, ptr, map->bankwidth);
346 	else
347 		BUG();
348 
349 	return r;
350 }
351 
352 static inline map_word map_word_load_partial(struct map_info *map, map_word orig, const unsigned char *buf, int start, int len)
353 {
354 	int i;
355 
356 	if (map_bankwidth_is_large(map)) {
357 		char *dest = (char *)&orig;
358 		memcpy(dest+start, buf, len);
359 	} else {
360 		for (i=start; i < start+len; i++) {
361 			int bitpos;
362 #ifdef __LITTLE_ENDIAN
363 			bitpos = i*8;
364 #else /* __BIG_ENDIAN */
365 			bitpos = (map_bankwidth(map)-1-i)*8;
366 #endif
367 			orig.x[0] &= ~(0xff << bitpos);
368 			orig.x[0] |= (unsigned long)buf[i-start] << bitpos;
369 		}
370 	}
371 	return orig;
372 }
373 
374 #if BITS_PER_LONG < 64
375 #define MAP_FF_LIMIT 4
376 #else
377 #define MAP_FF_LIMIT 8
378 #endif
379 
380 static inline map_word map_word_ff(struct map_info *map)
381 {
382 	map_word r;
383 	int i;
384 
385 	if (map_bankwidth(map) < MAP_FF_LIMIT) {
386 		int bw = 8 * map_bankwidth(map);
387 		r.x[0] = (1UL << bw) - 1;
388 	} else {
389 		for (i=0; i<map_words(map); i++)
390 			r.x[i] = ~0UL;
391 	}
392 	return r;
393 }
394 
395 static inline map_word inline_map_read(struct map_info *map, unsigned long ofs)
396 {
397 	map_word r;
398 
399 	if (map_bankwidth_is_1(map))
400 		r.x[0] = __raw_readb(map->virt + ofs);
401 	else if (map_bankwidth_is_2(map))
402 		r.x[0] = __raw_readw(map->virt + ofs);
403 	else if (map_bankwidth_is_4(map))
404 		r.x[0] = __raw_readl(map->virt + ofs);
405 #if BITS_PER_LONG >= 64
406 	else if (map_bankwidth_is_8(map))
407 		r.x[0] = __raw_readq(map->virt + ofs);
408 #endif
409 	else if (map_bankwidth_is_large(map))
410 		memcpy_fromio(r.x, map->virt+ofs, map->bankwidth);
411 	else
412 		BUG();
413 
414 	return r;
415 }
416 
417 static inline void inline_map_write(struct map_info *map, const map_word datum, unsigned long ofs)
418 {
419 	if (map_bankwidth_is_1(map))
420 		__raw_writeb(datum.x[0], map->virt + ofs);
421 	else if (map_bankwidth_is_2(map))
422 		__raw_writew(datum.x[0], map->virt + ofs);
423 	else if (map_bankwidth_is_4(map))
424 		__raw_writel(datum.x[0], map->virt + ofs);
425 #if BITS_PER_LONG >= 64
426 	else if (map_bankwidth_is_8(map))
427 		__raw_writeq(datum.x[0], map->virt + ofs);
428 #endif
429 	else if (map_bankwidth_is_large(map))
430 		memcpy_toio(map->virt+ofs, datum.x, map->bankwidth);
431 	else
432 		BUG();
433 	mb();
434 }
435 
436 static inline void inline_map_copy_from(struct map_info *map, void *to, unsigned long from, ssize_t len)
437 {
438 	if (map->cached)
439 		memcpy(to, (char *)map->cached + from, len);
440 	else
441 		memcpy_fromio(to, map->virt + from, len);
442 }
443 
444 static inline void inline_map_copy_to(struct map_info *map, unsigned long to, const void *from, ssize_t len)
445 {
446 	memcpy_toio(map->virt + to, from, len);
447 }
448 
449 #ifdef CONFIG_MTD_COMPLEX_MAPPINGS
450 #define map_read(map, ofs) (map)->read(map, ofs)
451 #define map_copy_from(map, to, from, len) (map)->copy_from(map, to, from, len)
452 #define map_write(map, datum, ofs) (map)->write(map, datum, ofs)
453 #define map_copy_to(map, to, from, len) (map)->copy_to(map, to, from, len)
454 
455 extern void simple_map_init(struct map_info *);
456 #define map_is_linear(map) (map->phys != NO_XIP)
457 
458 #else
459 #define map_read(map, ofs) inline_map_read(map, ofs)
460 #define map_copy_from(map, to, from, len) inline_map_copy_from(map, to, from, len)
461 #define map_write(map, datum, ofs) inline_map_write(map, datum, ofs)
462 #define map_copy_to(map, to, from, len) inline_map_copy_to(map, to, from, len)
463 
464 
465 #define simple_map_init(map) BUG_ON(!map_bankwidth_supported((map)->bankwidth))
466 #define map_is_linear(map) ({ (void)(map); 1; })
467 
468 #endif /* !CONFIG_MTD_COMPLEX_MAPPINGS */
469 
470 #endif /* __LINUX_MTD_MAP_H__ */
471