2 * Copyright © 2000-2010 David Woodhouse <dwmw2@infradead.org> et al.
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.
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.
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
20 /* Overhauled routines for dealing with different mmap regions of flash */
22 #ifndef __LINUX_MTD_MAP_H__
23 #define __LINUX_MTD_MAP_H__
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>
32 #include <asm/unaligned.h>
33 #include <asm/barrier.h>
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
42 #define map_bankwidth_is_1(map) (0)
45 #ifdef CONFIG_MTD_MAP_BANK_WIDTH_2
48 # define map_bankwidth(map) ((map)->bankwidth)
50 # define map_bankwidth(map) 2
51 # define map_bankwidth_is_large(map) (0)
52 # define map_words(map) (1)
54 #define map_bankwidth_is_2(map) (map_bankwidth(map) == 2)
55 #undef MAX_MAP_BANKWIDTH
56 #define MAX_MAP_BANKWIDTH 2
58 #define map_bankwidth_is_2(map) (0)
61 #ifdef CONFIG_MTD_MAP_BANK_WIDTH_4
64 # define map_bankwidth(map) ((map)->bankwidth)
66 # define map_bankwidth(map) 4
67 # define map_bankwidth_is_large(map) (0)
68 # define map_words(map) (1)
70 #define map_bankwidth_is_4(map) (map_bankwidth(map) == 4)
71 #undef MAX_MAP_BANKWIDTH
72 #define MAX_MAP_BANKWIDTH 4
74 #define map_bankwidth_is_4(map) (0)
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) */
80 #define map_calc_words(map) ((map_bankwidth(map) + (sizeof(unsigned long)-1)) / sizeof(unsigned long))
82 #ifdef CONFIG_MTD_MAP_BANK_WIDTH_8
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)
90 # define map_words(map) map_calc_words(map)
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)
97 #define map_bankwidth_is_8(map) (map_bankwidth(map) == 8)
98 #undef MAX_MAP_BANKWIDTH
99 #define MAX_MAP_BANKWIDTH 8
101 #define map_bankwidth_is_8(map) (0)
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)
111 # define map_words(map) map_calc_words(map)
113 # define map_bankwidth(map) 16
114 # define map_bankwidth_is_large(map) (1)
115 # define map_words(map) map_calc_words(map)
117 #define map_bankwidth_is_16(map) (map_bankwidth(map) == 16)
118 #undef MAX_MAP_BANKWIDTH
119 #define MAX_MAP_BANKWIDTH 16
121 #define map_bankwidth_is_16(map) (0)
124 #ifdef CONFIG_MTD_MAP_BANK_WIDTH_32
125 /* always use indirect access for 256-bit to preserve kernel stack */
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)
131 # define map_words(map) map_calc_words(map)
132 #define map_bankwidth_is_32(map) (map_bankwidth(map) == 32)
133 #undef MAX_MAP_BANKWIDTH
134 #define MAX_MAP_BANKWIDTH 32
136 #define map_bankwidth_is_32(map) (0)
139 #ifndef map_bankwidth
140 #warning "No CONFIG_MTD_MAP_BANK_WIDTH_xx selected. No NOR chip support can work"
141 static inline int map_bankwidth(void *map)
146 #define map_bankwidth_is_large(map) (0)
147 #define map_words(map) (0)
148 #define MAX_MAP_BANKWIDTH 1
151 static inline int map_bankwidth_supported(int w)
154 #ifdef CONFIG_MTD_MAP_BANK_WIDTH_1
157 #ifdef CONFIG_MTD_MAP_BANK_WIDTH_2
160 #ifdef CONFIG_MTD_MAP_BANK_WIDTH_4
163 #ifdef CONFIG_MTD_MAP_BANK_WIDTH_8
166 #ifdef CONFIG_MTD_MAP_BANK_WIDTH_16
169 #ifdef CONFIG_MTD_MAP_BANK_WIDTH_32
179 #define MAX_MAP_LONGS (((MAX_MAP_BANKWIDTH * 8) + BITS_PER_LONG - 1) / BITS_PER_LONG)
182 unsigned long x[MAX_MAP_LONGS];
185 /* The map stuff is very simple. You fill in your struct map_info with
186 a handful of routines for accessing the device, making sure they handle
187 paging etc. correctly if your device needs it. Then you pass it off
188 to a chip probe routine -- either JEDEC or CFI probe or both -- via
189 do_map_probe(). If a chip is recognised, the probe code will invoke the
190 appropriate chip driver (if present) and return a struct mtd_info.
191 At which point, you fill in the mtd->module with your own module
192 address, and register it with the MTD core code. Or you could partition
193 it and register the partitions instead, or keep it for your own private
196 The mtd->priv field will point to the struct map_info, and any further
197 private data required by the chip driver is linked from the
198 mtd->priv->fldrv_priv field. This allows the map driver to get at
199 the destructor function map->fldrv_destroy() when it's tired
206 resource_size_t phys;
207 #define NO_XIP (-1UL)
212 int swap; /* this mapping's byte-swapping requirement */
213 int bankwidth; /* in octets. This isn't necessarily the width
214 of actual bus cycles -- it's the repeat interval
215 in bytes, before you are talking to the first chip again.
218 #ifdef CONFIG_MTD_COMPLEX_MAPPINGS
219 map_word (*read)(struct map_info *, unsigned long);
220 void (*copy_from)(struct map_info *, void *, unsigned long, ssize_t);
222 void (*write)(struct map_info *, const map_word, unsigned long);
223 void (*copy_to)(struct map_info *, unsigned long, const void *, ssize_t);
225 /* We can perhaps put in 'point' and 'unpoint' methods, if we really
226 want to enable XIP for non-linear mappings. Not yet though. */
228 /* It's possible for the map driver to use cached memory in its
229 copy_from implementation (and _only_ with copy_from). However,
230 when the chip driver knows some flash area has changed contents,
231 it will signal it to the map driver through this routine to let
232 the map driver invalidate the corresponding cache as needed.
233 If there is no cache to care about this can be set to NULL. */
234 void (*inval_cache)(struct map_info *, unsigned long, ssize_t);
236 /* set_vpp() must handle being reentered -- enable, enable, disable
237 must leave it enabled. */
238 void (*set_vpp)(struct map_info *, int);
240 unsigned long pfow_base;
241 unsigned long map_priv_1;
242 unsigned long map_priv_2;
243 struct device_node *device_node;
245 struct mtd_chip_driver *fldrv;
248 struct mtd_chip_driver {
249 struct mtd_info *(*probe)(struct map_info *map);
250 void (*destroy)(struct mtd_info *);
251 struct module *module;
253 struct list_head list;
256 void register_mtd_chip_driver(struct mtd_chip_driver *);
257 void unregister_mtd_chip_driver(struct mtd_chip_driver *);
259 struct mtd_info *do_map_probe(const char *name, struct map_info *map);
260 void map_destroy(struct mtd_info *mtd);
262 #define ENABLE_VPP(map) do { if (map->set_vpp) map->set_vpp(map, 1); } while (0)
263 #define DISABLE_VPP(map) do { if (map->set_vpp) map->set_vpp(map, 0); } while (0)
265 #define INVALIDATE_CACHED_RANGE(map, from, size) \
266 do { if (map->inval_cache) map->inval_cache(map, from, size); } while (0)
268 #define map_word_equal(map, val1, val2) \
271 for (i = 0; i < map_words(map); i++) \
272 if ((val1).x[i] != (val2).x[i]) { \
279 #define map_word_and(map, val1, val2) \
283 for (i = 0; i < map_words(map); i++) \
284 r.x[i] = (val1).x[i] & (val2).x[i]; \
288 #define map_word_clr(map, val1, val2) \
292 for (i = 0; i < map_words(map); i++) \
293 r.x[i] = (val1).x[i] & ~(val2).x[i]; \
297 #define map_word_or(map, val1, val2) \
301 for (i = 0; i < map_words(map); i++) \
302 r.x[i] = (val1).x[i] | (val2).x[i]; \
306 #define map_word_andequal(map, val1, val2, val3) \
309 for (i = 0; i < map_words(map); i++) { \
310 if (((val1).x[i] & (val2).x[i]) != (val3).x[i]) { \
318 #define map_word_bitsset(map, val1, val2) \
321 for (i = 0; i < map_words(map); i++) { \
322 if ((val1).x[i] & (val2).x[i]) { \
330 static inline map_word map_word_load(struct map_info *map, const void *ptr)
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);
344 else if (map_bankwidth_is_large(map))
345 memcpy(r.x, ptr, map->bankwidth);
352 static inline map_word map_word_load_partial(struct map_info *map, map_word orig, const unsigned char *buf, int start, int len)
356 if (map_bankwidth_is_large(map)) {
357 char *dest = (char *)&orig;
359 memcpy(dest+start, buf, len);
361 for (i = start; i < start+len; i++) {
364 #ifdef __LITTLE_ENDIAN
366 #else /* __BIG_ENDIAN */
367 bitpos = (map_bankwidth(map) - 1 - i) * 8;
369 orig.x[0] &= ~(0xff << bitpos);
370 orig.x[0] |= (unsigned long)buf[i-start] << bitpos;
376 #if BITS_PER_LONG < 64
377 #define MAP_FF_LIMIT 4
379 #define MAP_FF_LIMIT 8
382 static inline map_word map_word_ff(struct map_info *map)
387 if (map_bankwidth(map) < MAP_FF_LIMIT) {
388 int bw = 8 * map_bankwidth(map);
390 r.x[0] = (1UL << bw) - 1;
392 for (i = 0; i < map_words(map); i++)
398 static inline map_word inline_map_read(struct map_info *map, unsigned long ofs)
402 if (map_bankwidth_is_1(map))
403 r.x[0] = __raw_readb(map->virt + ofs);
404 else if (map_bankwidth_is_2(map))
405 r.x[0] = __raw_readw(map->virt + ofs);
406 else if (map_bankwidth_is_4(map))
407 r.x[0] = __raw_readl(map->virt + ofs);
408 #if BITS_PER_LONG >= 64
409 else if (map_bankwidth_is_8(map))
410 r.x[0] = __raw_readq(map->virt + ofs);
412 else if (map_bankwidth_is_large(map))
413 memcpy_fromio(r.x, map->virt + ofs, map->bankwidth);
420 static inline void inline_map_write(struct map_info *map, const map_word datum, unsigned long ofs)
422 if (map_bankwidth_is_1(map))
423 __raw_writeb(datum.x[0], map->virt + ofs);
424 else if (map_bankwidth_is_2(map))
425 __raw_writew(datum.x[0], map->virt + ofs);
426 else if (map_bankwidth_is_4(map))
427 __raw_writel(datum.x[0], map->virt + ofs);
428 #if BITS_PER_LONG >= 64
429 else if (map_bankwidth_is_8(map))
430 __raw_writeq(datum.x[0], map->virt + ofs);
432 else if (map_bankwidth_is_large(map))
433 memcpy_toio(map->virt+ofs, datum.x, map->bankwidth);
439 static inline void inline_map_copy_from(struct map_info *map, void *to, unsigned long from, ssize_t len)
442 memcpy(to, (char *)map->cached + from, len);
444 memcpy_fromio(to, map->virt + from, len);
447 static inline void inline_map_copy_to(struct map_info *map, unsigned long to, const void *from, ssize_t len)
449 memcpy_toio(map->virt + to, from, len);
452 #ifdef CONFIG_MTD_COMPLEX_MAPPINGS
453 #define map_read(map, ofs) (map)->read(map, ofs)
454 #define map_copy_from(map, to, from, len) (map)->copy_from(map, to, from, len)
455 #define map_write(map, datum, ofs) (map)->write(map, datum, ofs)
456 #define map_copy_to(map, to, from, len) (map)->copy_to(map, to, from, len)
458 extern void simple_map_init(struct map_info *);
459 #define map_is_linear(map) (map->phys != NO_XIP)
462 #define map_read(map, ofs) inline_map_read(map, ofs)
463 #define map_copy_from(map, to, from, len) inline_map_copy_from(map, to, from, len)
464 #define map_write(map, datum, ofs) inline_map_write(map, datum, ofs)
465 #define map_copy_to(map, to, from, len) inline_map_copy_to(map, to, from, len)
468 #define simple_map_init(map) BUG_ON(!map_bankwidth_supported((map)->bankwidth))
469 #define map_is_linear(map) ({ (void)(map); 1; })
471 #endif /* !CONFIG_MTD_COMPLEX_MAPPINGS */
473 #endif /* __LINUX_MTD_MAP_H__ */