mirror of
git://git.openwrt.org/openwrt/openwrt.git
synced 2024-12-09 16:26:55 +00:00
144 lines
4.4 KiB
Diff
144 lines
4.4 KiB
Diff
|
From cddfb6f606768265f2b36658761ea9467f098f0a Mon Sep 17 00:00:00 2001
|
||
|
From: mokopatches <mokopatches@openmoko.org>
|
||
|
Date: Fri, 4 Apr 2008 11:33:44 +0100
|
||
|
Subject: [PATCH] s3c24xx-nand-largepage.patch
|
||
|
MTD: S3C24XX large page NAND support
|
||
|
|
||
|
This adds support for using large page NAND devices
|
||
|
with the S3C24XX NAND controller. This also adds the
|
||
|
file Documentation/arm/Samsung-S3C24XX/NAND.txt to
|
||
|
describe the differences.
|
||
|
|
||
|
Signed-off-by: Ben Dooks <ben-linux@fluff.org>
|
||
|
---
|
||
|
Documentation/arm/Samsung-S3C24XX/NAND.txt | 30 +++++++++++++++++++
|
||
|
Documentation/arm/Samsung-S3C24XX/Overview.txt | 2 +
|
||
|
drivers/mtd/nand/s3c2410.c | 38 ++++++++++++++++++++---
|
||
|
3 files changed, 65 insertions(+), 5 deletions(-)
|
||
|
create mode 100644 Documentation/arm/Samsung-S3C24XX/NAND.txt
|
||
|
|
||
|
diff --git a/Documentation/arm/Samsung-S3C24XX/NAND.txt b/Documentation/arm/Samsung-S3C24XX/NAND.txt
|
||
|
new file mode 100644
|
||
|
index 0000000..bc478a3
|
||
|
--- /dev/null
|
||
|
+++ b/Documentation/arm/Samsung-S3C24XX/NAND.txt
|
||
|
@@ -0,0 +1,30 @@
|
||
|
+ S3C24XX NAND Support
|
||
|
+ ====================
|
||
|
+
|
||
|
+Introduction
|
||
|
+------------
|
||
|
+
|
||
|
+Small Page NAND
|
||
|
+---------------
|
||
|
+
|
||
|
+The driver uses a 512 byte (1 page) ECC code for this setup. The
|
||
|
+ECC code is not directly compatible with the default kernel ECC
|
||
|
+code, so the driver enforces its own OOB layout and ECC parameters
|
||
|
+
|
||
|
+Large Page NAND
|
||
|
+---------------
|
||
|
+
|
||
|
+The driver is capable of handling NAND flash with a 2KiB page
|
||
|
+size, with support for hardware ECC generation and correction.
|
||
|
+
|
||
|
+Unlike the 512byte page mode, the driver generates ECC data for
|
||
|
+each 256 byte block in an 2KiB page. This means that more than
|
||
|
+one error in a page can be rectified. It also means that the
|
||
|
+OOB layout remains the default kernel layout for these flashes.
|
||
|
+
|
||
|
+
|
||
|
+Document Author
|
||
|
+---------------
|
||
|
+
|
||
|
+Ben Dooks, Copyright 2007 Simtec Electronics
|
||
|
+
|
||
|
diff --git a/Documentation/arm/Samsung-S3C24XX/Overview.txt b/Documentation/arm/Samsung-S3C24XX/Overview.txt
|
||
|
index c31b76f..d04e1e3 100644
|
||
|
--- a/Documentation/arm/Samsung-S3C24XX/Overview.txt
|
||
|
+++ b/Documentation/arm/Samsung-S3C24XX/Overview.txt
|
||
|
@@ -156,6 +156,8 @@ NAND
|
||
|
controller. If there are any problems the latest linux-mtd
|
||
|
code can be found from http://www.linux-mtd.infradead.org/
|
||
|
|
||
|
+ For more information see Documentation/arm/Samsung-S3C24XX/NAND.txt
|
||
|
+
|
||
|
|
||
|
Serial
|
||
|
------
|
||
|
diff --git a/drivers/mtd/nand/s3c2410.c b/drivers/mtd/nand/s3c2410.c
|
||
|
index 770306c..5c1c09d 100644
|
||
|
--- a/drivers/mtd/nand/s3c2410.c
|
||
|
+++ b/drivers/mtd/nand/s3c2410.c
|
||
|
@@ -473,7 +473,7 @@ static int s3c2440_nand_calculate_ecc(struct mtd_info *mtd, const u_char *dat, u
|
||
|
ecc_code[1] = ecc >> 8;
|
||
|
ecc_code[2] = ecc >> 16;
|
||
|
|
||
|
- pr_debug("%s: returning ecc %06lx\n", __func__, ecc);
|
||
|
+ pr_debug("%s: returning ecc %06lx\n", __func__, ecc & 0xffffff);
|
||
|
|
||
|
return 0;
|
||
|
}
|
||
|
@@ -662,9 +662,6 @@ static void s3c2410_nand_init_chip(struct s3c2410_nand_info *info,
|
||
|
chip->ecc.calculate = s3c2410_nand_calculate_ecc;
|
||
|
chip->ecc.correct = s3c2410_nand_correct_data;
|
||
|
chip->ecc.mode = NAND_ECC_HW;
|
||
|
- chip->ecc.size = 512;
|
||
|
- chip->ecc.bytes = 3;
|
||
|
- chip->ecc.layout = &nand_hw_eccoob;
|
||
|
|
||
|
switch (info->cpu_type) {
|
||
|
case TYPE_S3C2410:
|
||
|
@@ -688,6 +685,34 @@ static void s3c2410_nand_init_chip(struct s3c2410_nand_info *info,
|
||
|
}
|
||
|
}
|
||
|
|
||
|
+/* s3c2410_nand_update_chip
|
||
|
+ *
|
||
|
+ * post-probe chip update, to change any items, such as the
|
||
|
+ * layout for large page nand
|
||
|
+ */
|
||
|
+
|
||
|
+static void s3c2410_nand_update_chip(struct s3c2410_nand_info *info,
|
||
|
+ struct s3c2410_nand_mtd *nmtd)
|
||
|
+{
|
||
|
+ struct nand_chip *chip = &nmtd->chip;
|
||
|
+
|
||
|
+ printk("%s: chip %p: %d\n", __func__, chip, chip->page_shift);
|
||
|
+
|
||
|
+ if (hardware_ecc) {
|
||
|
+ /* change the behaviour depending on wether we are using
|
||
|
+ * the large or small page nand device */
|
||
|
+
|
||
|
+ if (chip->page_shift > 10) {
|
||
|
+ chip->ecc.size = 256;
|
||
|
+ chip->ecc.bytes = 3;
|
||
|
+ } else {
|
||
|
+ chip->ecc.size = 512;
|
||
|
+ chip->ecc.bytes = 3;
|
||
|
+ chip->ecc.layout = &nand_hw_eccoob;
|
||
|
+ }
|
||
|
+ }
|
||
|
+}
|
||
|
+
|
||
|
/* s3c2410_nand_probe
|
||
|
*
|
||
|
* called by device layer when it finds a device matching
|
||
|
@@ -794,9 +819,12 @@ static int s3c24xx_nand_probe(struct platform_device *pdev,
|
||
|
|
||
|
s3c2410_nand_init_chip(info, nmtd, sets);
|
||
|
|
||
|
- nmtd->scan_res = nand_scan(&nmtd->mtd, (sets) ? sets->nr_chips : 1);
|
||
|
+ nmtd->scan_res = nand_scan_ident(&nmtd->mtd,
|
||
|
+ (sets) ? sets->nr_chips : 1);
|
||
|
|
||
|
if (nmtd->scan_res == 0) {
|
||
|
+ s3c2410_nand_update_chip(info, nmtd);
|
||
|
+ nand_scan_tail(&nmtd->mtd);
|
||
|
s3c2410_nand_add_partition(info, nmtd, sets);
|
||
|
}
|
||
|
|
||
|
--
|
||
|
1.5.6.5
|
||
|
|