From: Pekon Gupta <pekon@ti.com>
To: mark.rutland@arm.com, olof@lixom.net,
computersforpeace@gmail.com, dedekind1@gmail.com
Cc: robherring2@gmail.com, Pawel.Moll@arm.com,
ijc+devicetree@hellion.org.uk, swarren@wwwdotorg.org,
dwmw2@infradead.org, arnd@arndb.de, tony@atomide.com,
bcousson@baylibre.com, avinashphilipk@gmail.com, balbi@ti.com,
linux-mtd@lists.infradead.org, linux-omap@vger.kernel.org,
devicetree@vger.kernel.org, jp.francois@cynove.com,
ivan.djelic@parrot.com, Pekon Gupta <pekon@ti.com>
Subject: [PATCH v11 07/10] mtd: nand: omap: use drivers/mtd/nand/nand_bch.c wrapper for BCH ECC instead of lib/bch.c
Date: Thu, 24 Oct 2013 18:20:23 +0530 [thread overview]
Message-ID: <1382619026-4182-8-git-send-email-pekon@ti.com> (raw)
In-Reply-To: <1382619026-4182-1-git-send-email-pekon@ti.com>
generic frame-work in mtd/nand/nand_bch.c is a wrapper above lib/bch.h which
encapsulates all control information specific to BCH ecc algorithm in software.
Thus this patch:
(1) replace omap specific implementations with equivalent wrapper in nand_bch.c
so that generic code from nand_bch.c is re-used. like;
omap3_correct_data_bch() -> nand_bch_correct_data()
omap3_free_bch() -> nand_bch_free()
(2) replace direct calls to lib/bch.c with wrapper functions defined in nand_bch.c
init_bch() -> nand_bch_init()
Signed-off-by: Pekon Gupta <pekon@ti.com>
---
drivers/mtd/nand/omap2.c | 96 +++++++++++-------------------------------------
1 file changed, 22 insertions(+), 74 deletions(-)
diff --git a/drivers/mtd/nand/omap2.c b/drivers/mtd/nand/omap2.c
index b6a08b2..93aa35c 100644
--- a/drivers/mtd/nand/omap2.c
+++ b/drivers/mtd/nand/omap2.c
@@ -25,7 +25,7 @@
#include <linux/of.h>
#include <linux/of_device.h>
-#include <linux/bch.h>
+#include <linux/mtd/nand_bch.h>
#include <linux/platform_data/elm.h>
#include <linux/platform_data/mtd-nand-omap2.h>
@@ -140,7 +140,6 @@
#define BCH_ECC_SIZE1 0x20 /* ecc_size1 = 32 */
#define BADBLOCK_MARKER_LENGTH 2
-#define OMAP_ECC_BCH8_POLYNOMIAL 0x201b
#ifdef CONFIG_MTD_NAND_OMAP_BCH
static u_char bch8_vector[] = {0xf3, 0xdb, 0x14, 0x16, 0x8b, 0xd2, 0xbe, 0xcc,
@@ -173,7 +172,6 @@ struct omap_nand_info {
int buf_len;
struct gpmc_nand_regs reg;
/* fields specific for BCHx_HW ECC scheme */
- struct bch_control *bch;
bool is_elm_used;
struct device *elm_dev;
struct device_node *of_node;
@@ -1507,43 +1505,7 @@ static int omap_elm_correct_data(struct mtd_info *mtd, u_char *data,
return stat;
}
-#endif /* CONFIG_MTD_NAND_OMAP_BCH */
-#ifdef CONFIG_MTD_NAND_ECC_BCH
-/**
- * omap3_correct_data_bch - Decode received data and correct errors
- * @mtd: MTD device structure
- * @data: page data
- * @read_ecc: ecc read from nand flash
- * @calc_ecc: ecc read from HW ECC registers
- */
-static int omap3_correct_data_bch(struct mtd_info *mtd, u_char *data,
- u_char *read_ecc, u_char *calc_ecc)
-{
- int i, count;
- /* cannot correct more than 8 errors */
- unsigned int errloc[8];
- struct omap_nand_info *info = container_of(mtd, struct omap_nand_info,
- mtd);
-
- count = decode_bch(info->bch, NULL, 512, read_ecc, calc_ecc, NULL,
- errloc);
- if (count > 0) {
- /* correct errors */
- for (i = 0; i < count; i++) {
- /* correct data only, not ecc bytes */
- if (errloc[i] < 8*512)
- data[errloc[i]/8] ^= 1 << (errloc[i] & 7);
- pr_debug("corrected bitflip %u\n", errloc[i]);
- }
- } else if (count < 0) {
- pr_err("ecc unrecoverable error\n");
- }
- return count;
-}
-#endif /* CONFIG_MTD_NAND_ECC_BCH */
-
-#ifdef CONFIG_MTD_NAND_OMAP_BCH
/**
* omap_write_page_bch - BCH ecc based write page function for entire page
* @mtd: mtd info structure
@@ -1660,28 +1622,6 @@ static int is_elm_present(struct omap_nand_info *info,
}
#endif /* CONFIG_MTD_NAND_ECC_BCH */
-#ifdef CONFIG_MTD_NAND_ECC_BCH
-/**
- * omap3_free_bch - Release BCH ecc resources
- * @mtd: MTD device structure
- */
-static void omap3_free_bch(struct mtd_info *mtd)
-{
- struct omap_nand_info *info = container_of(mtd, struct omap_nand_info,
- mtd);
- if (info->bch) {
- free_bch(info->bch);
- info->bch = NULL;
- }
-}
-
-#else
-
-static void omap3_free_bch(struct mtd_info *mtd)
-{
-}
-#endif /* CONFIG_MTD_NAND_ECC_BCH */
-
static int omap_nand_probe(struct platform_device *pdev)
{
struct omap_nand_info *info;
@@ -1714,13 +1654,13 @@ static int omap_nand_probe(struct platform_device *pdev)
info->pdev = pdev;
info->gpmc_cs = pdata->cs;
info->reg = pdata->reg;
- info->bch = NULL;
info->of_node = pdata->of_node;
mtd = &info->mtd;
mtd->priv = &info->nand;
mtd->name = dev_name(&pdev->dev);
mtd->owner = THIS_MODULE;
nand_chip = &info->nand;
+ nand_chip->ecc.priv = NULL;
nand_chip->options |= NAND_SKIP_BBTSCAN;
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
@@ -1903,7 +1843,7 @@ static int omap_nand_probe(struct platform_device *pdev)
nand_chip->ecc.bytes = 7;
nand_chip->ecc.strength = 4;
nand_chip->ecc.hwctl = omap3_enable_hwecc_bch;
- nand_chip->ecc.correct = omap3_correct_data_bch;
+ nand_chip->ecc.correct = nand_bch_correct_data;
nand_chip->ecc.calculate = omap3_calculate_ecc_bch4;
/* define ECC layout */
ecclayout->eccbytes = nand_chip->ecc.bytes *
@@ -1913,10 +1853,11 @@ static int omap_nand_probe(struct platform_device *pdev)
ecclayout->oobfree->offset = ecclayout->eccpos[0] +
ecclayout->eccbytes;
/* software bch library is used for locating errors */
- info->bch = init_bch(nand_chip->ecc.bytes,
- nand_chip->ecc.strength,
- OMAP_ECC_BCH8_POLYNOMIAL);
- if (!info->bch) {
+ nand_chip->ecc.priv = nand_bch_init(mtd,
+ nand_chip->ecc.size,
+ nand_chip->ecc.bytes,
+ &nand_chip->ecc.layout);
+ if (!nand_chip->ecc.priv) {
pr_err("nand: error: unable to use s/w BCH library\n");
err = -EINVAL;
}
@@ -1968,7 +1909,7 @@ static int omap_nand_probe(struct platform_device *pdev)
nand_chip->ecc.bytes = 13;
nand_chip->ecc.strength = 8;
nand_chip->ecc.hwctl = omap3_enable_hwecc_bch;
- nand_chip->ecc.correct = omap3_correct_data_bch;
+ nand_chip->ecc.correct = nand_bch_correct_data;
nand_chip->ecc.calculate = omap3_calculate_ecc_bch8;
/* define ECC layout */
ecclayout->eccbytes = nand_chip->ecc.bytes *
@@ -1978,10 +1919,11 @@ static int omap_nand_probe(struct platform_device *pdev)
ecclayout->oobfree->offset = ecclayout->eccpos[0] +
ecclayout->eccbytes;
/* software bch library is used for locating errors */
- info->bch = init_bch(nand_chip->ecc.bytes,
- nand_chip->ecc.strength,
- OMAP_ECC_BCH8_POLYNOMIAL);
- if (!info->bch) {
+ nand_chip->ecc.priv = nand_bch_init(mtd,
+ nand_chip->ecc.size,
+ nand_chip->ecc.bytes,
+ &nand_chip->ecc.layout);
+ if (!nand_chip->ecc.priv) {
pr_err("nand: error: unable to use s/w BCH library\n");
err = -EINVAL;
goto out_release_mem_region;
@@ -2067,7 +2009,10 @@ out_release_mem_region:
free_irq(info->gpmc_irq_fifo, info);
release_mem_region(info->phys_base, info->mem_size);
out_free_info:
- omap3_free_bch(mtd);
+ if (nand_chip->ecc.priv) {
+ nand_bch_free(nand_chip->ecc.priv);
+ nand_chip->ecc.priv = NULL;
+ }
kfree(info);
return err;
@@ -2079,7 +2024,10 @@ static int omap_nand_remove(struct platform_device *pdev)
struct nand_chip *nand_chip = mtd->priv;
struct omap_nand_info *info = container_of(mtd, struct omap_nand_info,
mtd);
- omap3_free_bch(mtd);
+ if (nand_chip->ecc.priv) {
+ nand_bch_free(nand_chip->ecc.priv);
+ nand_chip->ecc.priv = NULL;
+ }
if (info->dma)
dma_release_channel(info->dma);
--
1.8.1
next prev parent reply other threads:[~2013-10-24 12:50 UTC|newest]
Thread overview: 21+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-10-24 12:50 [PATCH v11 00/10] [PATCH v10 00/10] mtd:nand:omap2: clean-up of supported ECC schemes Pekon Gupta
2013-10-24 12:50 ` [PATCH v11 01/10] ARM: OMAP2+: cleaned-up DT support of various " Pekon Gupta
2013-10-24 12:50 ` [PATCH v11 02/10] mtd: nand: omap: combine different flavours of 1-bit hamming ecc schemes Pekon Gupta
2013-10-24 12:50 ` [PATCH v11 03/10] mtd: nand: omap: cleanup: replace local references with generic framework names Pekon Gupta
2013-10-24 12:50 ` [PATCH v11 04/10] mtd: nand: omap: use DT specified bus-width only for scanning NAND device Pekon Gupta
2013-10-24 21:27 ` Ezequiel Garcia
2013-10-24 22:43 ` Brian Norris
2013-10-24 22:49 ` Ezequiel Garcia
2013-10-24 12:50 ` [PATCH v11 05/10] mtd:nand:omap2: clean-up BCHx_HW and BCHx_SW ECC configurations in device_probe Pekon Gupta
2013-10-24 12:50 ` Pekon Gupta [this message]
2013-10-24 12:50 ` [PATCH v11 08/10] ARM: dts: AM33xx: updated default ECC scheme in nand-ecc-opt Pekon Gupta
2013-10-24 12:50 ` [PATCH v11 09/10] mtd: nand: omap: updated devm_xx for all resource allocation and free calls Pekon Gupta
[not found] ` <1382619026-4182-1-git-send-email-pekon-l0cyMroinI0@public.gmane.org>
2013-10-24 12:50 ` [PATCH v11 06/10] mtd: nand: omap: clean-up ecc layout for BCH ecc schemes Pekon Gupta
2013-10-24 12:50 ` [PATCH v11 10/10] mtd: nand: omap: remove selection of BCH ecc-scheme via KConfig Pekon Gupta
2013-10-24 13:52 ` [PATCH v11 00/10] [PATCH v10 00/10] mtd:nand:omap2: clean-up of supported ECC schemes Ezequiel Garcia
2013-10-30 3:59 ` Brian Norris
2013-10-30 9:16 ` Ezequiel Garcia
2013-10-30 21:30 ` Gupta, Pekon
2013-10-31 21:23 ` Tony Lindgren
2013-11-01 20:10 ` Gupta, Pekon
2013-10-25 10:56 ` Ezequiel Garcia
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