Commit ad855eae authored by Carlo Caione's avatar Carlo Caione Committed by Kevin Hilman
Browse files

nvmem: amlogic: Add Amlogic Meson EFUSE driver 



Add Amlogic EFUSE driver to access hardware data like ethernet address,
serial number or IDs.

Acked-by: default avatarSrinivas Kandagatla <srinivas.kandagatla@linaro.org>
Signed-off-by: default avatarCarlo Caione <carlo@endlessm.com>
Signed-off-by: default avatarKevin Hilman <khilman@baylibre.com>
parent 2c4ddb21

drivers/nvmem/Kconfig

+10 −0
Original line number Diff line number Diff line
@@ -101,4 +101,14 @@ config NVMEM_VF610_OCOTP 
	  This driver can also be build as a module. If so, the module will

	  be called nvmem-vf610-ocotp.



config MESON_EFUSE

	tristate "Amlogic eFuse Support"

	depends on (ARCH_MESON || COMPILE_TEST) && MESON_SM

	help

	  This is a driver to retrieve specific values from the eFuse found on

	  the Amlogic Meson SoCs.



	  This driver can also be built as a module. If so, the module

	  will be called nvmem_meson_efuse.



endif

drivers/nvmem/Makefile

+2 −0
Original line number Diff line number Diff line
@@ -22,3 +22,5 @@ obj-$(CONFIG_NVMEM_SUNXI_SID) += nvmem_sunxi_sid.o 
nvmem_sunxi_sid-y		:= sunxi_sid.o

obj-$(CONFIG_NVMEM_VF610_OCOTP)	+= nvmem-vf610-ocotp.o

nvmem-vf610-ocotp-y		:= vf610-ocotp.o

obj-$(CONFIG_MESON_EFUSE)	+= nvmem_meson_efuse.o

nvmem_meson_efuse-y		:= meson-efuse.o

drivers/nvmem/meson-efuse.c

0 → 100644
+93 −0
Original line number Diff line number Diff line 
/*

 * Amlogic eFuse Driver

 *

 * Copyright (c) 2016 Endless Computers, Inc.

 * Author: Carlo Caione <carlo@endlessm.com>

 *

 * This program is free software; you can redistribute it and/or modify it

 * under the terms of version 2 of the GNU General Public License as

 * published by the Free Software Foundation.

 *

 * This program is distributed in the hope that it will be useful, but WITHOUT

 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for

 * more details.

 */



#include <linux/module.h>

#include <linux/nvmem-provider.h>

#include <linux/of.h>

#include <linux/platform_device.h>



#include <linux/firmware/meson/meson_sm.h>



static int meson_efuse_read(void *context, unsigned int offset,

			    void *val, size_t bytes)

{

	u8 *buf = val;

	int ret;



	ret = meson_sm_call_read(buf, SM_EFUSE_READ, offset,

				 bytes, 0, 0, 0);

	if (ret < 0)

		return ret;



	return 0;

}



static struct nvmem_config econfig = {

	.name = "meson-efuse",

	.owner = THIS_MODULE,

	.stride = 1,

	.word_size = 1,

	.read_only = true,

};



static const struct of_device_id meson_efuse_match[] = {

	{ .compatible = "amlogic,meson-gxbb-efuse", },

	{ /* sentinel */ },

};

MODULE_DEVICE_TABLE(of, meson_efuse_match);



static int meson_efuse_probe(struct platform_device *pdev)

{

	struct nvmem_device *nvmem;

	unsigned int size;



	if (meson_sm_call(SM_EFUSE_USER_MAX, &size, 0, 0, 0, 0, 0) < 0)

		return -EINVAL;



	econfig.dev = &pdev->dev;

	econfig.reg_read = meson_efuse_read;

	econfig.size = size;



	nvmem = nvmem_register(&econfig);

	if (IS_ERR(nvmem))

		return PTR_ERR(nvmem);



	platform_set_drvdata(pdev, nvmem);



	return 0;

}



static int meson_efuse_remove(struct platform_device *pdev)

{

	struct nvmem_device *nvmem = platform_get_drvdata(pdev);



	return nvmem_unregister(nvmem);

}



static struct platform_driver meson_efuse_driver = {

	.probe = meson_efuse_probe,

	.remove = meson_efuse_remove,

	.driver = {

		.name = "meson-efuse",

		.of_match_table = meson_efuse_match,

	},

};



module_platform_driver(meson_efuse_driver);



MODULE_AUTHOR("Carlo Caione <carlo@endlessm.com>");

MODULE_DESCRIPTION("Amlogic Meson NVMEM driver");

MODULE_LICENSE("GPL v2");