Minki/linux
1
0
Fork 1
mirror of https://github.com/torvalds/linux.git synced 2024-12-21 02:21:36 +00:00
Code Issues Packages Projects Releases Wiki Activity

[MTD] writev support for cfi-cmdset-0001

Browse Source 
While this might be useful for all supported flash types, it is mandatory
for proper JFFS2 support with Sibley flash.

Signed-off-by: Nicolas Pitre <nico@cam.org>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
This commit is contained in:
Nicolas Pitre 2005-08-06 05:46:59 +01:00 committed by Thomas Gleixner
parent 638d983840
commit e102d54abf
1 changed files with 74 additions and 49 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

123
drivers/mtd/chips/cfi_cmdset_0001.c
View File

@ -4,7 +4,7 @@
*
* (C) 2000 Red Hat. GPL'd
*
* $Id: cfi_cmdset_0001.c,v 1.182 2005/08/06 04:40:41 nico Exp $
* $Id: cfi_cmdset_0001.c,v 1.183 2005/08/06 04:46:56 nico Exp $
*
*
* 10/10/2000 Nicolas Pitre <nico@cam.org>
@ -51,6 +51,7 @@
static int cfi_intelext_read (struct mtd_info *, loff_t, size_t, size_t *, u_char *);
static int cfi_intelext_write_words(struct mtd_info *, loff_t, size_t, size_t *, const u_char *);
static int cfi_intelext_write_buffers(struct mtd_info *, loff_t, size_t, size_t *, const u_char *);
static int cfi_intelext_writev(struct mtd_info *, const struct kvec *, unsigned long, loff_t, size_t *);
static int cfi_intelext_erase_varsize(struct mtd_info *, struct erase_info *);
static void cfi_intelext_sync (struct mtd_info *);
static int cfi_intelext_lock(struct mtd_info *mtd, loff_t ofs, size_t len);
@ -215,6 +216,7 @@ static void fixup_use_write_buffers(struct mtd_info *mtd, void *param)
if (cfi->cfiq->BufWriteTimeoutTyp) {
printk(KERN_INFO "Using buffer write method\n" );
mtd->write = cfi_intelext_write_buffers;
mtd->writev = cfi_intelext_writev;
}
}
@ -1445,12 +1447,15 @@ static int cfi_intelext_write_words (struct mtd_info *mtd, loff_t to , size_t le
static int __xipram do_write_buffer(struct map_info *map, struct flchip *chip,
unsigned long adr, const u_char *buf, int len)
unsigned long adr, const struct kvec **pvec,
unsigned long *pvec_seek, int len)
{
struct cfi_private *cfi = map->fldrv_priv;
map_word status, status_OK, write_cmd;
map_word status, status_OK, write_cmd, datum;
unsigned long cmd_adr, timeo;
int wbufsize, z, ret=0, bytes, words;
int wbufsize, z, ret=0, word_gap, words;
const struct kvec *vec;
unsigned long vec_seek;
wbufsize = cfi_interleave(cfi) << cfi->cfiq->MaxBufWriteSize;
adr += chip->start;
@ -1515,28 +1520,53 @@ static int __xipram do_write_buffer(struct map_info *map, struct flchip *chip,
}
}
/* Figure out the number of words to write */
word_gap = (-adr & (map_bankwidth(map)-1));
words = (len - word_gap + map_bankwidth(map) - 1) / map_bankwidth(map);
if (!word_gap) {
words--;
} else {
word_gap = map_bankwidth(map) - word_gap;
adr -= word_gap;
datum = map_word_ff(map);
}
/* Write length of data to come */
bytes = len & (map_bankwidth(map)-1);
words = len / map_bankwidth(map);
map_write(map, CMD(words - !bytes), cmd_adr );
map_write(map, CMD(words), cmd_adr );
/* Write data */
z = 0;
while(z < words * map_bankwidth(map)) {
map_word datum = map_word_load(map, buf);
map_write(map, datum, adr+z);
vec = *pvec;
vec_seek = *pvec_seek;
do {
int n = map_bankwidth(map) - word_gap;
if (n > vec->iov_len - vec_seek)
n = vec->iov_len - vec_seek;
if (n > len)
n = len;
z += map_bankwidth(map);
buf += map_bankwidth(map);
}
if (!word_gap && len < map_bankwidth(map))
datum = map_word_ff(map);
datum = map_word_load_partial(map, datum,
vec->iov_base + vec_seek,
word_gap, n);
if (bytes) {
map_word datum;
len -= n;
word_gap += n;
if (!len || word_gap == map_bankwidth(map)) {
map_write(map, datum, adr);
adr += map_bankwidth(map);
word_gap = 0;
}
datum = map_word_ff(map);
datum = map_word_load_partial(map, datum, buf, 0, bytes);
map_write(map, datum, adr+z);
}
vec_seek += n;
if (vec_seek == vec->iov_len) {
vec++;
vec_seek = 0;
}
} while (len);
*pvec = vec;
*pvec_seek = vec_seek;
/* GO GO GO */
map_write(map, CMD(0xd0), cmd_adr);
@ -1619,57 +1649,40 @@ static int __xipram do_write_buffer(struct map_info *map, struct flchip *chip,
return ret;
}
static int cfi_intelext_write_buffers (struct mtd_info *mtd, loff_t to,
size_t len, size_t *retlen, const u_char *buf)
static int cfi_intelext_writev (struct mtd_info *mtd, const struct kvec *vecs,
unsigned long count, loff_t to, size_t *retlen)
{
struct map_info *map = mtd->priv;
struct cfi_private *cfi = map->fldrv_priv;
int wbufsize = cfi_interleave(cfi) << cfi->cfiq->MaxBufWriteSize;
int ret = 0;
int chipnum;
unsigned long ofs;
unsigned long ofs, vec_seek, i;
size_t len = 0;
for (i = 0; i < count; i++)
len += vecs[i].iov_len;
*retlen = 0;
if (!len)
return 0;
chipnum = to >> cfi->chipshift;
ofs = to - (chipnum << cfi->chipshift);
ofs = to - (chipnum << cfi->chipshift);
vec_seek = 0;
/* If it's not bus-aligned, do the first word write */
if (ofs & (map_bankwidth(map)-1)) {
size_t local_len = (-ofs)&(map_bankwidth(map)-1);
if (local_len > len)
local_len = len;
ret = cfi_intelext_write_words(mtd, to, local_len,
retlen, buf);
if (ret)
return ret;
ofs += local_len;
buf += local_len;
len -= local_len;
if (ofs >> cfi->chipshift) {
chipnum ++;
ofs = 0;
if (chipnum == cfi->numchips)
return 0;
}
}
while(len) {
do {
/* We must not cross write block boundaries */
int size = wbufsize - (ofs & (wbufsize-1));
if (size > len)
size = len;
ret = do_write_buffer(map, &cfi->chips[chipnum],
ofs, buf, size);
ofs, &vecs, &vec_seek, size);
if (ret)
return ret;
ofs += size;
buf += size;
(*retlen) += size;
len -= size;
@ -1679,10 +1692,22 @@ static int cfi_intelext_write_buffers (struct mtd_info *mtd, loff_t to,
if (chipnum == cfi->numchips)
return 0;
}
}
} while (len);
return 0;
}
static int cfi_intelext_write_buffers (struct mtd_info *mtd, loff_t to,
size_t len, size_t *retlen, const u_char *buf)
{
struct kvec vec;
vec.iov_base = (void *) buf;
vec.iov_len = len;
return cfi_intelext_writev(mtd, &vec, 1, to, retlen);
}
static int __xipram do_erase_oneblock(struct map_info *map, struct flchip *chip,
unsigned long adr, int len, void *thunk)
{