mirror of
https://github.com/edk2-porting/linux-next.git
synced 2024-12-23 20:53:53 +08:00
6d9434ebb7
This commit adds simple helpers to obtain the devicetree properties that specify the ECC strength and ECC step size to use on a given NAND controller. Acked-by: Boris BREZILLON <b.brezillon.dev@gmail.com> Signed-off-by: Ezequiel Garcia <ezequiel.garcia@free-electrons.com> Signed-off-by: Brian Norris <computersforpeace@gmail.com>
120 lines
2.8 KiB
C
120 lines
2.8 KiB
C
/*
|
|
* Copyright 2012 Jean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com>
|
|
*
|
|
* 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>
|
|
|
|
/**
|
|
* It maps 'enum nand_ecc_modes_t' found in include/linux/mtd/nand.h
|
|
* into the device tree binding of 'nand-ecc', so that MTD
|
|
* device driver can get nand ecc from device tree.
|
|
*/
|
|
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",
|
|
};
|
|
|
|
/**
|
|
* of_get_nand_ecc_mode - Get nand ecc mode for given device_node
|
|
* @np: Pointer to the given device_node
|
|
*
|
|
* The function gets ecc mode string from property 'nand-ecc-mode',
|
|
* and return its index in nand_ecc_modes table, or errno in error case.
|
|
*/
|
|
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);
|
|
|
|
/**
|
|
* of_get_nand_ecc_step_size - Get ECC step size associated to
|
|
* the required ECC strength (see below).
|
|
* @np: Pointer to the given device_node
|
|
*
|
|
* return the ECC step size, or errno in error case.
|
|
*/
|
|
int of_get_nand_ecc_step_size(struct device_node *np)
|
|
{
|
|
int ret;
|
|
u32 val;
|
|
|
|
ret = of_property_read_u32(np, "nand-ecc-step-size", &val);
|
|
return ret ? ret : val;
|
|
}
|
|
EXPORT_SYMBOL_GPL(of_get_nand_ecc_step_size);
|
|
|
|
/**
|
|
* of_get_nand_ecc_strength - Get required ECC strength over the
|
|
* correspnding step size as defined by 'nand-ecc-size'
|
|
* @np: Pointer to the given device_node
|
|
*
|
|
* return the ECC strength, or errno in error case.
|
|
*/
|
|
int of_get_nand_ecc_strength(struct device_node *np)
|
|
{
|
|
int ret;
|
|
u32 val;
|
|
|
|
ret = of_property_read_u32(np, "nand-ecc-strength", &val);
|
|
return ret ? ret : val;
|
|
}
|
|
EXPORT_SYMBOL_GPL(of_get_nand_ecc_strength);
|
|
|
|
/**
|
|
* of_get_nand_bus_width - Get nand bus witdh for given device_node
|
|
* @np: Pointer to the given device_node
|
|
*
|
|
* return bus width option, or errno in error case.
|
|
*/
|
|
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);
|
|
|
|
/**
|
|
* of_get_nand_on_flash_bbt - Get nand on flash bbt for given device_node
|
|
* @np: Pointer to the given device_node
|
|
*
|
|
* return true if present false other wise
|
|
*/
|
|
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);
|