2 /* Overhauled routines for dealing with different mmap regions of flash */
4 #ifndef __LINUX_MTD_MAP_H__
5 #define __LINUX_MTD_MAP_H__
7 #include <linux/types.h>
8 #include <linux/list.h>
9 #include <linux/string.h>
11 #include <linux/mtd/compatmac.h>
13 #include <asm/unaligned.h>
14 #include <asm/system.h>
17 #ifdef CONFIG_MTD_MAP_BANK_WIDTH_1
18 #define map_bankwidth(map) 1
19 #define map_bankwidth_is_1(map) (map_bankwidth(map) == 1)
20 #define map_bankwidth_is_large(map) (0)
21 #define map_words(map) (1)
22 #define MAX_MAP_BANKWIDTH 1
24 #define map_bankwidth_is_1(map) (0)
27 #ifdef CONFIG_MTD_MAP_BANK_WIDTH_2
30 # define map_bankwidth(map) ((map)->bankwidth)
32 # define map_bankwidth(map) 2
33 # define map_bankwidth_is_large(map) (0)
34 # define map_words(map) (1)
36 #define map_bankwidth_is_2(map) (map_bankwidth(map) == 2)
37 #undef MAX_MAP_BANKWIDTH
38 #define MAX_MAP_BANKWIDTH 2
40 #define map_bankwidth_is_2(map) (0)
43 #ifdef CONFIG_MTD_MAP_BANK_WIDTH_4
46 # define map_bankwidth(map) ((map)->bankwidth)
48 # define map_bankwidth(map) 4
49 # define map_bankwidth_is_large(map) (0)
50 # define map_words(map) (1)
52 #define map_bankwidth_is_4(map) (map_bankwidth(map) == 4)
53 #undef MAX_MAP_BANKWIDTH
54 #define MAX_MAP_BANKWIDTH 4
56 #define map_bankwidth_is_4(map) (0)
59 /* ensure we never evaluate anything shorted than an unsigned long
60 * to zero, and ensure we'll never miss the end of an comparison (bjd) */
62 #define map_calc_words(map) ((map_bankwidth(map) + (sizeof(unsigned long)-1))/ sizeof(unsigned long))
64 #ifdef CONFIG_MTD_MAP_BANK_WIDTH_8
67 # define map_bankwidth(map) ((map)->bankwidth)
68 # if BITS_PER_LONG < 64
69 # undef map_bankwidth_is_large
70 # define map_bankwidth_is_large(map) (map_bankwidth(map) > BITS_PER_LONG/8)
72 # define map_words(map) map_calc_words(map)
75 # define map_bankwidth(map) 8
76 # define map_bankwidth_is_large(map) (BITS_PER_LONG < 64)
77 # define map_words(map) map_calc_words(map)
79 #define map_bankwidth_is_8(map) (map_bankwidth(map) == 8)
80 #undef MAX_MAP_BANKWIDTH
81 #define MAX_MAP_BANKWIDTH 8
83 #define map_bankwidth_is_8(map) (0)
86 #ifdef CONFIG_MTD_MAP_BANK_WIDTH_16
89 # define map_bankwidth(map) ((map)->bankwidth)
90 # undef map_bankwidth_is_large
91 # define map_bankwidth_is_large(map) (map_bankwidth(map) > BITS_PER_LONG/8)
93 # define map_words(map) map_calc_words(map)
95 # define map_bankwidth(map) 16
96 # define map_bankwidth_is_large(map) (1)
97 # define map_words(map) map_calc_words(map)
99 #define map_bankwidth_is_16(map) (map_bankwidth(map) == 16)
100 #undef MAX_MAP_BANKWIDTH
101 #define MAX_MAP_BANKWIDTH 16
103 #define map_bankwidth_is_16(map) (0)
106 #ifdef CONFIG_MTD_MAP_BANK_WIDTH_32
107 # ifdef map_bankwidth
108 # undef map_bankwidth
109 # define map_bankwidth(map) ((map)->bankwidth)
110 # undef map_bankwidth_is_large
111 # define map_bankwidth_is_large(map) (map_bankwidth(map) > BITS_PER_LONG/8)
113 # define map_words(map) map_calc_words(map)
115 # define map_bankwidth(map) 32
116 # define map_bankwidth_is_large(map) (1)
117 # define map_words(map) map_calc_words(map)
119 #define map_bankwidth_is_32(map) (map_bankwidth(map) == 32)
120 #undef MAX_MAP_BANKWIDTH
121 #define MAX_MAP_BANKWIDTH 32
123 #define map_bankwidth_is_32(map) (0)
126 #ifndef map_bankwidth
127 #warning "No CONFIG_MTD_MAP_BANK_WIDTH_xx selected. No NOR chip support can work"
128 static inline int map_bankwidth(void *map)
133 #define map_bankwidth_is_large(map) (0)
134 #define map_words(map) (0)
135 #define MAX_MAP_BANKWIDTH 1
138 static inline int map_bankwidth_supported(int w)
141 #ifdef CONFIG_MTD_MAP_BANK_WIDTH_1
144 #ifdef CONFIG_MTD_MAP_BANK_WIDTH_2
147 #ifdef CONFIG_MTD_MAP_BANK_WIDTH_4
150 #ifdef CONFIG_MTD_MAP_BANK_WIDTH_8
153 #ifdef CONFIG_MTD_MAP_BANK_WIDTH_16
156 #ifdef CONFIG_MTD_MAP_BANK_WIDTH_32
166 #define MAX_MAP_LONGS ( ((MAX_MAP_BANKWIDTH*8) + BITS_PER_LONG - 1) / BITS_PER_LONG )
169 unsigned long x[MAX_MAP_LONGS];
172 /* The map stuff is very simple. You fill in your struct map_info with
173 a handful of routines for accessing the device, making sure they handle
174 paging etc. correctly if your device needs it. Then you pass it off
175 to a chip probe routine -- either JEDEC or CFI probe or both -- via
176 do_map_probe(). If a chip is recognised, the probe code will invoke the
177 appropriate chip driver (if present) and return a struct mtd_info.
178 At which point, you fill in the mtd->module with your own module
179 address, and register it with the MTD core code. Or you could partition
180 it and register the partitions instead, or keep it for your own private
183 The mtd->priv field will point to the struct map_info, and any further
184 private data required by the chip driver is linked from the
185 mtd->priv->fldrv_priv field. This allows the map driver to get at
186 the destructor function map->fldrv_destroy() when it's tired
193 resource_size_t phys;
194 #define NO_XIP (-1UL)
199 int bankwidth; /* in octets. This isn't necessarily the width
200 of actual bus cycles -- it's the repeat interval
201 in bytes, before you are talking to the first chip again.
204 #ifdef CONFIG_MTD_COMPLEX_MAPPINGS
205 map_word (*read)(struct map_info *, unsigned long);
206 void (*copy_from)(struct map_info *, void *, unsigned long, ssize_t);
208 void (*write)(struct map_info *, const map_word, unsigned long);
209 void (*copy_to)(struct map_info *, unsigned long, const void *, ssize_t);
211 /* We can perhaps put in 'point' and 'unpoint' methods, if we really
212 want to enable XIP for non-linear mappings. Not yet though. */
214 /* It's possible for the map driver to use cached memory in its
215 copy_from implementation (and _only_ with copy_from). However,
216 when the chip driver knows some flash area has changed contents,
217 it will signal it to the map driver through this routine to let
218 the map driver invalidate the corresponding cache as needed.
219 If there is no cache to care about this can be set to NULL. */
220 void (*inval_cache)(struct map_info *, unsigned long, ssize_t);
222 /* set_vpp() must handle being reentered -- enable, enable, disable
223 must leave it enabled. */
224 void (*set_vpp)(struct map_info *, int);
226 unsigned long map_priv_1;
227 unsigned long map_priv_2;
229 struct mtd_chip_driver *fldrv;
232 struct mtd_chip_driver {
233 struct mtd_info *(*probe)(struct map_info *map);
234 void (*destroy)(struct mtd_info *);
235 struct module *module;
237 struct list_head list;
240 void register_mtd_chip_driver(struct mtd_chip_driver *);
241 void unregister_mtd_chip_driver(struct mtd_chip_driver *);
243 struct mtd_info *do_map_probe(const char *name, struct map_info *map);
244 void map_destroy(struct mtd_info *mtd);
246 #define ENABLE_VPP(map) do { if(map->set_vpp) map->set_vpp(map, 1); } while(0)
247 #define DISABLE_VPP(map) do { if(map->set_vpp) map->set_vpp(map, 0); } while(0)
249 #define INVALIDATE_CACHED_RANGE(map, from, size) \
250 do { if(map->inval_cache) map->inval_cache(map, from, size); } while(0)
253 static inline int map_word_equal(struct map_info *map, map_word val1, map_word val2)
256 for (i=0; i<map_words(map); i++) {
257 if (val1.x[i] != val2.x[i])
263 static inline map_word map_word_and(struct map_info *map, map_word val1, map_word val2)
268 for (i=0; i<map_words(map); i++) {
269 r.x[i] = val1.x[i] & val2.x[i];
274 static inline map_word map_word_clr(struct map_info *map, map_word val1, map_word val2)
279 for (i=0; i<map_words(map); i++) {
280 r.x[i] = val1.x[i] & ~val2.x[i];
285 static inline map_word map_word_or(struct map_info *map, map_word val1, map_word val2)
290 for (i=0; i<map_words(map); i++) {
291 r.x[i] = val1.x[i] | val2.x[i];
296 #define map_word_andequal(m, a, b, z) map_word_equal(m, z, map_word_and(m, a, b))
298 static inline int map_word_bitsset(struct map_info *map, map_word val1, map_word val2)
302 for (i=0; i<map_words(map); i++) {
303 if (val1.x[i] & val2.x[i])
309 static inline map_word map_word_load(struct map_info *map, const void *ptr)
313 if (map_bankwidth_is_1(map))
314 r.x[0] = *(unsigned char *)ptr;
315 else if (map_bankwidth_is_2(map))
316 r.x[0] = get_unaligned((uint16_t *)ptr);
317 else if (map_bankwidth_is_4(map))
318 r.x[0] = get_unaligned((uint32_t *)ptr);
319 #if BITS_PER_LONG >= 64
320 else if (map_bankwidth_is_8(map))
321 r.x[0] = get_unaligned((uint64_t *)ptr);
323 else if (map_bankwidth_is_large(map))
324 memcpy(r.x, ptr, map->bankwidth);
329 static inline map_word map_word_load_partial(struct map_info *map, map_word orig, const unsigned char *buf, int start, int len)
333 if (map_bankwidth_is_large(map)) {
334 char *dest = (char *)&orig;
335 memcpy(dest+start, buf, len);
337 for (i=start; i < start+len; i++) {
339 #ifdef __LITTLE_ENDIAN
341 #else /* __BIG_ENDIAN */
342 bitpos = (map_bankwidth(map)-1-i)*8;
344 orig.x[0] &= ~(0xff << bitpos);
345 orig.x[0] |= buf[i-start] << bitpos;
351 #if BITS_PER_LONG < 64
352 #define MAP_FF_LIMIT 4
354 #define MAP_FF_LIMIT 8
357 static inline map_word map_word_ff(struct map_info *map)
362 if (map_bankwidth(map) < MAP_FF_LIMIT) {
363 int bw = 8 * map_bankwidth(map);
364 r.x[0] = (1 << bw) - 1;
366 for (i=0; i<map_words(map); i++)
372 static inline map_word inline_map_read(struct map_info *map, unsigned long ofs)
376 if (map_bankwidth_is_1(map))
377 r.x[0] = __raw_readb(map->virt + ofs);
378 else if (map_bankwidth_is_2(map))
379 r.x[0] = __raw_readw(map->virt + ofs);
380 else if (map_bankwidth_is_4(map))
381 r.x[0] = __raw_readl(map->virt + ofs);
382 #if BITS_PER_LONG >= 64
383 else if (map_bankwidth_is_8(map))
384 r.x[0] = __raw_readq(map->virt + ofs);
386 else if (map_bankwidth_is_large(map))
387 memcpy_fromio(r.x, map->virt+ofs, map->bankwidth);
392 static inline void inline_map_write(struct map_info *map, const map_word datum, unsigned long ofs)
394 if (map_bankwidth_is_1(map))
395 __raw_writeb(datum.x[0], map->virt + ofs);
396 else if (map_bankwidth_is_2(map))
397 __raw_writew(datum.x[0], map->virt + ofs);
398 else if (map_bankwidth_is_4(map))
399 __raw_writel(datum.x[0], map->virt + ofs);
400 #if BITS_PER_LONG >= 64
401 else if (map_bankwidth_is_8(map))
402 __raw_writeq(datum.x[0], map->virt + ofs);
404 else if (map_bankwidth_is_large(map))
405 memcpy_toio(map->virt+ofs, datum.x, map->bankwidth);
409 static inline void inline_map_copy_from(struct map_info *map, void *to, unsigned long from, ssize_t len)
412 memcpy(to, (char *)map->cached + from, len);
414 memcpy_fromio(to, map->virt + from, len);
417 static inline void inline_map_copy_to(struct map_info *map, unsigned long to, const void *from, ssize_t len)
419 memcpy_toio(map->virt + to, from, len);
422 #ifdef CONFIG_MTD_COMPLEX_MAPPINGS
423 #define map_read(map, ofs) (map)->read(map, ofs)
424 #define map_copy_from(map, to, from, len) (map)->copy_from(map, to, from, len)
425 #define map_write(map, datum, ofs) (map)->write(map, datum, ofs)
426 #define map_copy_to(map, to, from, len) (map)->copy_to(map, to, from, len)
428 extern void simple_map_init(struct map_info *);
429 #define map_is_linear(map) (map->phys != NO_XIP)
432 #define map_read(map, ofs) inline_map_read(map, ofs)
433 #define map_copy_from(map, to, from, len) inline_map_copy_from(map, to, from, len)
434 #define map_write(map, datum, ofs) inline_map_write(map, datum, ofs)
435 #define map_copy_to(map, to, from, len) inline_map_copy_to(map, to, from, len)
438 #define simple_map_init(map) BUG_ON(!map_bankwidth_supported((map)->bankwidth))
439 #define map_is_linear(map) ({ (void)(map); 1; })
441 #endif /* !CONFIG_MTD_COMPLEX_MAPPINGS */
443 #endif /* __LINUX_MTD_MAP_H__ */