diff options
| -rw-r--r-- | drivers/mtd/chips/cfi_cmdset_0001.c | 125 |
1 files changed, 75 insertions, 50 deletions
diff --git a/drivers/mtd/chips/cfi_cmdset_0001.c b/drivers/mtd/chips/cfi_cmdset_0001.c index 10c5060..adaad7c 100644 --- a/drivers/mtd/chips/cfi_cmdset_0001.c +++ b/drivers/mtd/chips/cfi_cmdset_0001.c @@ -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); - - z += map_bankwidth(map); - buf += map_bankwidth(map); - } + 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; + + 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) { |
