summaryrefslogtreecommitdiffstats
path: root/drivers/mtd/nand/s3c2410.c
diff options
context:
space:
mode:
Diffstat (limited to 'drivers/mtd/nand/s3c2410.c')
-rw-r--r--drivers/mtd/nand/s3c2410.c61
1 files changed, 33 insertions, 28 deletions
diff --git a/drivers/mtd/nand/s3c2410.c b/drivers/mtd/nand/s3c2410.c
index 2df5e47d1f5..97e9b7892d2 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 1.14 2005/07/06 20:05:06 bjd Exp $
+ * $Id: s3c2410.c,v 1.20 2005/11/07 11:14:31 gleixner 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);
@@ -159,20 +160,22 @@ 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 */
-static int s3c2410_nand_inithw(struct s3c2410_nand_info *info,
+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);
@@ -183,16 +186,16 @@ static int s3c2410_nand_inithw(struct s3c2410_nand_info *info,
twrph0 = 8;
twrph1 = 8;
}
-
+
if (tacls < 0 || twrph0 < 0 || twrph1 < 0) {
printk(KERN_ERR PFX "cannot get timings suitable for board\n");
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;
@@ -216,7 +219,7 @@ static int s3c2410_nand_inithw(struct s3c2410_nand_info *info,
static void s3c2410_nand_select_chip(struct mtd_info *mtd, int chip)
{
struct s3c2410_nand_info *info;
- struct s3c2410_nand_mtd *nmtd;
+ struct s3c2410_nand_mtd *nmtd;
struct nand_chip *this = mtd->priv;
void __iomem *reg;
unsigned long cur;
@@ -249,7 +252,7 @@ static void s3c2410_nand_select_chip(struct mtd_info *mtd, int chip)
writel(cur, reg);
}
-/* command and control functions
+/* command and control functions
*
* Note, these all use tglx's method of changing the IO_ADDR_W field
* to make the code simpler, and use the nand layer's code to issue the
@@ -321,7 +324,7 @@ static void s3c2440_nand_hwcontrol(struct mtd_info *mtd, int cmd)
static int s3c2410_nand_devready(struct mtd_info *mtd)
{
struct s3c2410_nand_info *info = s3c2410_nand_mtd_toinfo(mtd);
-
+
if (info->is_s3c2440)
return readb(info->regs + S3C2440_NFSTAT) & S3C2440_NFSTAT_READY;
return readb(info->regs + S3C2410_NFSTAT) & S3C2410_NFSTAT_BUSY;
@@ -342,7 +345,7 @@ static int s3c2410_nand_correct_data(struct mtd_info *mtd, u_char *dat,
if (read_ecc[0] == calc_ecc[0] &&
read_ecc[1] == calc_ecc[1] &&
- read_ecc[2] == calc_ecc[2])
+ read_ecc[2] == calc_ecc[2])
return 0;
/* we curently have no method for correcting the error */
@@ -433,14 +436,14 @@ static int s3c2410_nand_remove(struct device *dev)
dev_set_drvdata(dev, NULL);
- if (info == NULL)
+ if (info == NULL)
return 0;
/* first thing we need to do is release all our mtds
* and their partitions, then go through freeing the
- * resources used
+ * resources used
*/
-
+
if (info->mtds != NULL) {
struct s3c2410_nand_mtd *ptr = info->mtds;
int mtdno;
@@ -504,7 +507,7 @@ static int s3c2410_nand_add_partition(struct s3c2410_nand_info *info,
/* s3c2410_nand_init_chip
*
- * init a single instance of an chip
+ * init a single instance of an chip
*/
static void s3c2410_nand_init_chip(struct s3c2410_nand_info *info,
@@ -576,7 +579,7 @@ static int s3c24xx_nand_probe(struct device *dev, int is_s3c2440)
info = kmalloc(sizeof(*info), GFP_KERNEL);
if (info == NULL) {
- printk(KERN_ERR PFX "no memory for flash info\n");
+ dev_err(dev, "no memory for flash info\n");
err = -ENOMEM;
goto exit_error;
}
@@ -591,7 +594,7 @@ static int s3c24xx_nand_probe(struct device *dev, int is_s3c2440)
info->clk = clk_get(dev, "nand");
if (IS_ERR(info->clk)) {
- printk(KERN_ERR PFX "failed to get clock");
+ dev_err(dev, "failed to get clock");
err = -ENOENT;
goto exit_error;
}
@@ -608,7 +611,7 @@ static int s3c24xx_nand_probe(struct device *dev, int is_s3c2440)
info->area = request_mem_region(res->start, size, pdev->name);
if (info->area == NULL) {
- printk(KERN_ERR PFX "cannot reserve register region\n");
+ dev_err(dev, "cannot reserve register region\n");
err = -ENOENT;
goto exit_error;
}
@@ -619,12 +622,12 @@ static int s3c24xx_nand_probe(struct device *dev, int is_s3c2440)
info->is_s3c2440 = is_s3c2440;
if (info->regs == NULL) {
- printk(KERN_ERR PFX "cannot reserve register region\n");
+ dev_err(dev, "cannot reserve register region\n");
err = -EIO;
goto exit_error;
- }
+ }
- printk(KERN_INFO PFX "mapped registers at %p\n", info->regs);
+ dev_dbg(dev, "mapped registers at %p\n", info->regs);
/* initialise the hardware */
@@ -642,7 +645,7 @@ static int s3c24xx_nand_probe(struct device *dev, int is_s3c2440)
size = nr_sets * sizeof(*info->mtds);
info->mtds = kmalloc(size, GFP_KERNEL);
if (info->mtds == NULL) {
- printk(KERN_ERR PFX "failed to allocate mtd storage\n");
+ dev_err(dev, "failed to allocate mtd storage\n");
err = -ENOMEM;
goto exit_error;
}
@@ -656,7 +659,7 @@ static int s3c24xx_nand_probe(struct device *dev, int is_s3c2440)
for (setno = 0; setno < nr_sets; setno++, nmtd++) {
pr_debug("initialising set %d (%p, info %p)\n",
setno, nmtd, info);
-
+
s3c2410_nand_init_chip(info, nmtd, sets);
nmtd->scan_res = nand_scan(&nmtd->mtd,
@@ -669,7 +672,7 @@ static int s3c24xx_nand_probe(struct device *dev, int is_s3c2440)
if (sets != NULL)
sets++;
}
-
+
pr_debug("initialised ok\n");
return 0;
@@ -695,6 +698,7 @@ static int s3c2440_nand_probe(struct device *dev)
static struct device_driver s3c2410_nand_driver = {
.name = "s3c2410-nand",
+ .owner = THIS_MODULE,
.bus = &platform_bus_type,
.probe = s3c2410_nand_probe,
.remove = s3c2410_nand_remove,
@@ -702,6 +706,7 @@ static struct device_driver s3c2410_nand_driver = {
static struct device_driver s3c2440_nand_driver = {
.name = "s3c2440-nand",
+ .owner = THIS_MODULE,
.bus = &platform_bus_type,
.probe = s3c2440_nand_probe,
.remove = s3c2410_nand_remove,
generated by cgit v1.2.3-70-g09d2 (git 2.46.0) at 2024-12-23 11:44:20 +0000