Donate to e Foundation | Murena handsets with /e/OS | Own a part of Murena! Learn more

Commit 770d7c39 authored by Jean-Christophe PLAGNIOL-VILLARD's avatar Jean-Christophe PLAGNIOL-VILLARD
Browse files

of/mtd/nand: add generic bindings and helpers 



- nand-ecc-mode : String, operation mode of the NAND ecc mode.
  Supported values are: "none", "soft", "hw", "hw_syndrome", "hw_oob_first",
  "soft_bch".
- nand-bus-width : 8 or 16 bus width if not present 8
- nand-on-flash-bbt: boolean to enable on flash bbt option if not present false

Signed-off-by: default avatarJean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com>
Acked-by: default avatarGrant Likely <grant.likely@secretlab.ca>
Acked-by: default avatarStefan Roese <sr@denx.de>
parent fa4d34cc

Documentation/devicetree/bindings/mtd/nand.txt

0 → 100644
+7 −0
Original line number Diff line number Diff line 
* MTD generic binding



- nand-ecc-mode : String, operation mode of the NAND ecc mode.

  Supported values are: "none", "soft", "hw", "hw_syndrome", "hw_oob_first",

  "soft_bch".

- nand-bus-width : 8 or 16 bus width if not present 8

- nand-on-flash-bbt: boolean to enable on flash bbt option if not present false

drivers/of/Kconfig

+4 −0
Original line number Diff line number Diff line
@@ -90,4 +90,8 @@ config OF_PCI_IRQ 
	help

	  OpenFirmware PCI IRQ routing helpers



config OF_MTD

	depends on MTD

	def_bool y



endmenu # OF

drivers/of/Makefile

+1 −0
Original line number Diff line number Diff line
@@ -12,3 +12,4 @@ obj-$(CONFIG_OF_SELFTEST) += selftest.o 
obj-$(CONFIG_OF_MDIO)	+= of_mdio.o

obj-$(CONFIG_OF_PCI)	+= of_pci.o

obj-$(CONFIG_OF_PCI_IRQ)  += of_pci_irq.o

obj-$(CONFIG_OF_MTD)	+= of_mtd.o

drivers/of/of_mtd.c

0 → 100644
+85 −0
Original line number Diff line number Diff line 
/*

 * 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.

 */

const 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_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);

include/linux/of_mtd.h

0 → 100644
+19 −0
Original line number Diff line number Diff line 
/*

 * Copyright 2012 Jean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com>

 *

 * OF helpers for mtd.

 *

 * This file is released under the GPLv2

 */



#ifndef __LINUX_OF_MTD_H

#define __LINUX_OF_NET_H



#ifdef CONFIG_OF_MTD

#include <linux/of.h>

extern const int of_get_nand_ecc_mode(struct device_node *np);

int of_get_nand_bus_width(struct device_node *np);

bool of_get_nand_on_flash_bbt(struct device_node *np);

#endif



#endif /* __LINUX_OF_MTD_H */