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[MTD] NAND s3c2410.c: Fix timing calculation bugs

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Spotted by basprog@mail.ru

Signed-off-by: Ben Dooks <ben-linux@fluff.org>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
This commit is contained in:
Ben Dooks 2005-10-20 22:22:58 +01:00 committed by Thomas Gleixner
parent 4fc67fbe52
commit cfd320fbfc
1 changed files with 12 additions and 9 deletions
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21
drivers/mtd/nand/s3c2410.c
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@ -17,8 +17,9 @@
* 02-May-2005 BJD Reduced hwcontrol decode * 02-May-2005 BJD Reduced hwcontrol decode
* 20-Jun-2005 BJD Updated s3c2440 support, fixed timing bug * 20-Jun-2005 BJD Updated s3c2440 support, fixed timing bug
* 08-Jul-2005 BJD Fix OOPS when no platform data supplied * 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 * 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 * 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 */ /* 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) static int s3c2410_nand_calc_rate(int wanted, unsigned long clk, int max)
{ {
int result; int result;
result = (wanted * NS_IN_KHZ) / clk; result = (wanted * clk) / NS_IN_KHZ;
result++; result++;
pr_debug("result %d from %ld, %d\n", result, clk, wanted); 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; 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 */ /* controller setup */
@ -167,12 +168,14 @@ static int s3c2410_nand_inithw(struct s3c2410_nand_info *info,
struct device *dev) struct device *dev)
{ {
struct s3c2410_platform_nand *plat = to_nand_plat(dev); struct s3c2410_platform_nand *plat = to_nand_plat(dev);
unsigned int tacls, twrph0, twrph1;
unsigned long clkrate = clk_get_rate(info->clk); unsigned long clkrate = clk_get_rate(info->clk);
int tacls, twrph0, twrph1;
unsigned long cfg; unsigned long cfg;
/* calculate the timing information for the controller */ /* calculate the timing information for the controller */
clkrate /= 1000; /* turn clock into kHz for ease of use */
if (plat != NULL) { if (plat != NULL) {
tacls = s3c2410_nand_calc_rate(plat->tacls, clkrate, 4); tacls = s3c2410_nand_calc_rate(plat->tacls, clkrate, 4);
twrph0 = s3c2410_nand_calc_rate(plat->twrph0, clkrate, 8); 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; return -EINVAL;
} }
printk(KERN_INFO PFX "timing: Tacls %ldns, Twrph0 %ldns, Twrph1 %ldns\n", printk(KERN_INFO PFX "Tacls=%d, %dns Twrph0=%d %dns, Twrph1=%d %dns\n",
to_ns(tacls, clkrate), tacls, to_ns(tacls, clkrate),
to_ns(twrph0, clkrate), twrph0, to_ns(twrph0, clkrate),
to_ns(twrph1, clkrate)); twrph1, to_ns(twrph1, clkrate));
if (!info->is_s3c2440) { if (!info->is_s3c2440) {
cfg = S3C2410_NFCONF_EN; cfg = S3C2410_NFCONF_EN;