of_mtd.c

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/*
 * Copyright 2012 Jean-Christophe PLAGNIOL-VILLARD <[email protected]>
 *
 * OF helpers for mtd.
 *
 * This file is released under the GPLv2
 *
 */
#include <linux/kernel.h>
#include <linux/of_mtd.h>
#include <linux/mtd/nand.h>
#include <linux/export.h>

static const char *nand_ecc_modes[] = {
    [NAND_ECC_NONE]     = "none",
    [NAND_ECC_SOFT]     = "soft",
    [NAND_ECC_HW]       = "hw",
    [NAND_ECC_HW_SYNDROME]  = "hw_syndrome",
    [NAND_ECC_HW_OOB_FIRST] = "hw_oob_first",
    [NAND_ECC_SOFT_BCH] = "soft_bch",
};

int of_get_nand_ecc_mode(struct device_node *np)
{
    const char *pm;
    int err, i;

    err = of_property_read_string(np, "nand-ecc-mode", &pm);
    if (err < 0)
        return err;

    for (i = 0; i < ARRAY_SIZE(nand_ecc_modes); i++)
        if (!strcasecmp(pm, nand_ecc_modes[i]))
            return i;

    return -ENODEV;
}
EXPORT_SYMBOL_GPL(of_get_nand_ecc_mode);

int of_get_nand_bus_width(struct device_node *np)
{
    u32 val;

    if (of_property_read_u32(np, "nand-bus-width", &val))
        return 8;

    switch(val) {
    case 8:
    case 16:
        return val;
    default:
        return -EIO;
    }
}
EXPORT_SYMBOL_GPL(of_get_nand_bus_width);

bool of_get_nand_on_flash_bbt(struct device_node *np)
{
    return of_property_read_bool(np, "nand-on-flash-bbt");
}
EXPORT_SYMBOL_GPL(of_get_nand_on_flash_bbt);