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nvmem: brcm_nvram: new driver exposing Broadcom's NVRAM

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This driver provides access to Broadcom's NVRAM.

Signed-off-by: Rafał Miłecki <rafal@milecki.pl>
Signed-off-by: Srinivas Kandagatla <srinivas.kandagatla@linaro.org>
Link: https://lore.kernel.org/r/20210330111241.19401-6-srinivas.kandagatla@linaro.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Rafał Miłecki 2021-03-30 12:12:36 +01:00 committed by Greg Kroah-Hartman
parent 5783bd1970
commit 3fef9ed062
3 changed files with 89 additions and 0 deletions
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9
drivers/nvmem/Kconfig
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@ -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

2
drivers/nvmem/Makefile
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@ -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

78
drivers/nvmem/brcm_nvram.c Normal file
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@ -0,0 +1,78 @@
// 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);