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[MTD] [NAND] S3C2410: Deal with unaligned lengths in S3C2440 buffer read/write

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Add code to deal with fractional lengths, as reported by
Werner Almesberger. Re-work of his original patch.

Signed-off-by: Ben Dooks <ben-linux@fluff.org>
This commit is contained in:
Ben Dooks
2009-05-30 18:30:18 +01:00
parent 9db41f9edc
commit dea2aa6fd7
1 changed files with 20 additions and 2 deletions
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22
drivers/mtd/nand/s3c2410.c
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@ -584,7 +584,16 @@ static void s3c2410_nand_read_buf(struct mtd_info *mtd, u_char *buf, int len)
static void s3c2440_nand_read_buf(struct mtd_info *mtd, u_char *buf, int len) static void s3c2440_nand_read_buf(struct mtd_info *mtd, u_char *buf, int len)
{ {
struct s3c2410_nand_info *info = s3c2410_nand_mtd_toinfo(mtd); struct s3c2410_nand_info *info = s3c2410_nand_mtd_toinfo(mtd);
readsl(info->regs + S3C2440_NFDATA, buf, len / 4);
readsl(info->regs + S3C2440_NFDATA, buf, len >> 2);
/* cleanup if we've got less than a word to do */
if (len & 3) {
buf += len & ~3;
for (; len & 3; len--)
*buf++ = readb(info->regs + S3C2440_NFDATA);
}
} }
static void s3c2410_nand_write_buf(struct mtd_info *mtd, const u_char *buf, int len) static void s3c2410_nand_write_buf(struct mtd_info *mtd, const u_char *buf, int len)
@ -596,7 +605,16 @@ static void s3c2410_nand_write_buf(struct mtd_info *mtd, const u_char *buf, int
static void s3c2440_nand_write_buf(struct mtd_info *mtd, const u_char *buf, int len) static void s3c2440_nand_write_buf(struct mtd_info *mtd, const u_char *buf, int len)
{ {
struct s3c2410_nand_info *info = s3c2410_nand_mtd_toinfo(mtd); struct s3c2410_nand_info *info = s3c2410_nand_mtd_toinfo(mtd);
writesl(info->regs + S3C2440_NFDATA, buf, len / 4);
writesl(info->regs + S3C2440_NFDATA, buf, len >> 2);
/* cleanup any fractional write */
if (len & 3) {
buf += len & ~3;
for (; len & 3; len--, buf++)
writeb(*buf, info->regs + S3C2440_NFDATA);
}
} }
/* cpufreq driver support */ /* cpufreq driver support */