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mtd: nand: omap: use drivers/mtd/nand/nand_bch.c wrapper for BCH ECC instead of lib/bch.c 

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>
Tested-by: Ezequiel Garcia <ezequiel.garcia@free-electrons.com>
Signed-off-by: Brian Norris <computersforpeace@gmail.com>
This commit is contained in:
Pekon Gupta 2013-10-24 18:20:23 +05:30 committed by Brian Norris
parent b491da7233
commit 32d42a855a
1 changed files with 22 additions and 74 deletions
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96
drivers/mtd/nand/omap2.c
View File

@ -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);