Commit 3fef9ed0 authored by Rafał Miłecki's avatar Rafał Miłecki Committed by Greg Kroah-Hartman
Browse files

nvmem: brcm_nvram: new driver exposing Broadcom's NVRAM 



This driver provides access to Broadcom's NVRAM.

Signed-off-by: default avatarRafał Miłecki <rafal@milecki.pl>
Signed-off-by: default avatarSrinivas Kandagatla <srinivas.kandagatla@linaro.org>
Link: https://lore.kernel.org/r/20210330111241.19401-6-srinivas.kandagatla@linaro.org


Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent 5783bd19

drivers/nvmem/Kconfig

+9 −0
Original line number Diff line number Diff line
@@ -278,4 +278,13 @@ config NVMEM_RMEM 


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

	  will be called nvmem-rmem.



config NVMEM_BRCM_NVRAM

	tristate "Broadcom's NVRAM support"

	depends on ARCH_BCM_5301X || COMPILE_TEST

	depends on HAS_IOMEM

	help

	  This driver provides support for Broadcom's NVRAM that can be accessed

	  using I/O mapping.



endif

drivers/nvmem/Makefile

+2 −0
Original line number Diff line number Diff line
@@ -57,3 +57,5 @@ obj-$(CONFIG_SPRD_EFUSE) += nvmem_sprd_efuse.o 
nvmem_sprd_efuse-y		:= sprd-efuse.o

obj-$(CONFIG_NVMEM_RMEM) 	+= nvmem-rmem.o

nvmem-rmem-y			:= rmem.o

obj-$(CONFIG_NVMEM_BRCM_NVRAM)	+= nvmem_brcm_nvram.o

nvmem_brcm_nvram-y		:= brcm_nvram.o

drivers/nvmem/brcm_nvram.c

0 → 100644
+78 −0
Original line number Diff line number Diff line 
// SPDX-License-Identifier: GPL-2.0-only

/*

 * Copyright (C) 2021 Rafał Miłecki <rafal@milecki.pl>

 */



#include <linux/io.h>

#include <linux/mod_devicetable.h>

#include <linux/module.h>

#include <linux/nvmem-provider.h>

#include <linux/platform_device.h>



struct brcm_nvram {

	struct device *dev;

	void __iomem *base;

};



static int brcm_nvram_read(void *context, unsigned int offset, void *val,

			   size_t bytes)

{

	struct brcm_nvram *priv = context;

	u8 *dst = val;



	while (bytes--)

		*dst++ = readb(priv->base + offset++);



	return 0;

}



static int brcm_nvram_probe(struct platform_device *pdev)

{

	struct nvmem_config config = {

		.name = "brcm-nvram",

		.reg_read = brcm_nvram_read,

	};

	struct device *dev = &pdev->dev;

	struct resource *res;

	struct brcm_nvram *priv;



	priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);

	if (!priv)

		return -ENOMEM;

	priv->dev = dev;



	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);

	priv->base = devm_ioremap_resource(dev, res);

	if (IS_ERR(priv->base))

		return PTR_ERR(priv->base);



	config.dev = dev;

	config.priv = priv;

	config.size = resource_size(res);



	return PTR_ERR_OR_ZERO(devm_nvmem_register(dev, &config));

}



static const struct of_device_id brcm_nvram_of_match_table[] = {

	{ .compatible = "brcm,nvram", },

	{},

};



static struct platform_driver brcm_nvram_driver = {

	.probe = brcm_nvram_probe,

	.driver = {

		.name = "brcm_nvram",

		.of_match_table = brcm_nvram_of_match_table,

	},

};



static int __init brcm_nvram_init(void)

{

	return platform_driver_register(&brcm_nvram_driver);

}



subsys_initcall_sync(brcm_nvram_init);



MODULE_AUTHOR("Rafał Miłecki");

MODULE_LICENSE("GPL");

MODULE_DEVICE_TABLE(of, brcm_nvram_of_match_table);