diff options
| author | Ben Dooks <ben@simtec.co.uk> | 2005-10-20 22:22:58 +0100 |
|---|---|---|
| committer | Thomas Gleixner <tglx@mtd.linutronix.de> | 2005-11-06 23:15:54 +0100 |
| commit | cfd320fbfcf2ff0137d8e26f46ba4b66dae96083 (patch) | |
| tree | b27bf728473a8e5d7159876053be1763ec94304f /drivers/mtd | |
| parent | 4fc67fbe52d7c34dfd3e03a1a79f3e078904bba2 (diff) | |
[MTD] NAND s3c2410.c: Fix timing calculation bugs
Spotted by basprog@mail.ru
Signed-off-by: Ben Dooks <ben-linux@fluff.org>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Diffstat (limited to 'drivers/mtd')
| -rw-r--r-- | drivers/mtd/nand/s3c2410.c | 21 |
1 files changed, 12 insertions, 9 deletions
diff --git a/drivers/mtd/nand/s3c2410.c b/drivers/mtd/nand/s3c2410.c index 41f2078225a..24f4199eaee 100644 --- a/drivers/mtd/nand/s3c2410.c +++ b/drivers/mtd/nand/s3c2410.c @@ -17,8 +17,9 @@ * 02-May-2005 BJD Reduced hwcontrol decode * 20-Jun-2005 BJD Updated s3c2440 support, fixed timing bug * 08-Jul-2005 BJD Fix OOPS when no platform data supplied + * 20-Oct-2005 BJD Fix timing calculation bug * - * $Id: s3c2410.c,v 1.17 2005/10/10 10:27:02 bjd Exp $ + * $Id: s3c2410.c,v 1.18 2005/10/20 21:22:55 bjd Exp $ * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by @@ -136,13 +137,13 @@ static struct s3c2410_platform_nand *to_nand_plat(struct device *dev) /* timing calculations */ -#define NS_IN_KHZ 10000000 +#define NS_IN_KHZ 1000000 static int s3c2410_nand_calc_rate(int wanted, unsigned long clk, int max) { int result; - result = (wanted * NS_IN_KHZ) / clk; + result = (wanted * clk) / NS_IN_KHZ; result++; pr_debug("result %d from %ld, %d\n", result, clk, wanted); @@ -159,7 +160,7 @@ static int s3c2410_nand_calc_rate(int wanted, unsigned long clk, int max) return result; } -#define to_ns(ticks,clk) (((clk) * (ticks)) / NS_IN_KHZ) +#define to_ns(ticks,clk) (((ticks) * NS_IN_KHZ) / (unsigned int)(clk)) /* controller setup */ @@ -167,12 +168,14 @@ static int s3c2410_nand_inithw(struct s3c2410_nand_info *info, struct device *dev) { struct s3c2410_platform_nand *plat = to_nand_plat(dev); - unsigned int tacls, twrph0, twrph1; unsigned long clkrate = clk_get_rate(info->clk); + int tacls, twrph0, twrph1; unsigned long cfg; /* calculate the timing information for the controller */ + clkrate /= 1000; /* turn clock into kHz for ease of use */ + if (plat != NULL) { tacls = s3c2410_nand_calc_rate(plat->tacls, clkrate, 4); twrph0 = s3c2410_nand_calc_rate(plat->twrph0, clkrate, 8); @@ -189,10 +192,10 @@ static int s3c2410_nand_inithw(struct s3c2410_nand_info *info, return -EINVAL; } - printk(KERN_INFO PFX "timing: Tacls %ldns, Twrph0 %ldns, Twrph1 %ldns\n", - to_ns(tacls, clkrate), - to_ns(twrph0, clkrate), - to_ns(twrph1, clkrate)); + printk(KERN_INFO PFX "Tacls=%d, %dns Twrph0=%d %dns, Twrph1=%d %dns\n", + tacls, to_ns(tacls, clkrate), + twrph0, to_ns(twrph0, clkrate), + twrph1, to_ns(twrph1, clkrate)); if (!info->is_s3c2440) { cfg = S3C2410_NFCONF_EN; |