On Fri, Jan 14, 2022 at 09:50:46AM +0100, Ahmad Fatoum wrote:
> The driver allows read-only support to e.g. the Hardware UID, which
> could in future be used to derive a MAC like U-Boot does.
>
> Signed-off-by: Ahmad Fatoum <a.fatoum@xxxxxxxxxxxxxx>
> ---
> drivers/nvmem/Kconfig | 8 +
> drivers/nvmem/Makefile | 1 +
> drivers/nvmem/rockchip-efuse.c | 299 +++++++++++++++++++++++++++++++++
> 3 files changed, 308 insertions(+)
> create mode 100644 drivers/nvmem/rockchip-efuse.c
>
> diff --git a/drivers/nvmem/Kconfig b/drivers/nvmem/Kconfig
> index 7b1ebe1d689d..ea1156918a34 100644
> --- a/drivers/nvmem/Kconfig
> +++ b/drivers/nvmem/Kconfig
> @@ -84,4 +84,12 @@ config STARFIVE_OTP
> This adds support for the StarFive OTP controller. Only reading
> is currently supported.
>
> +config ROCKCHIP_EFUSE
> + tristate "Rockchip eFuse Support"
> + depends on ARCH_ROCKCHIP || COMPILE_TEST
> + depends on OFDEVICE
> + help
> + This is a simple drive to dump specified values of Rockchip SoC
> + from eFuse, such as CPU ID.
> +
> endif
> diff --git a/drivers/nvmem/Makefile b/drivers/nvmem/Makefile
> index 586591961215..2261816c189c 100644
> --- a/drivers/nvmem/Makefile
> +++ b/drivers/nvmem/Makefile
> @@ -25,3 +25,4 @@ obj-$(CONFIG_STM32_BSEC) += nvmem_bsec.o
> nvmem_bsec-y := bsec.o
>
> obj-$(CONFIG_STARFIVE_OTP) += starfive-otp.o
> +obj-$(CONFIG_ROCKCHIP_EFUSE) += rockchip-efuse.o
> diff --git a/drivers/nvmem/rockchip-efuse.c b/drivers/nvmem/rockchip-efuse.c
> new file mode 100644
> index 000000000000..24e7de0aa9ce
> --- /dev/null
> +++ b/drivers/nvmem/rockchip-efuse.c
> @@ -0,0 +1,299 @@
> +// SPDX-License-Identifier: GPL-2.0-only
> +/*
> + * Rockchip eFuse Driver
> + *
> + * Copyright (c) 2015 Rockchip Electronics Co. Ltd.
> + * Author: Caesar Wang <wxt@xxxxxxxxxxxxxx>
> + */
> +
> +#include <common.h>
> +#include <linux/clk.h>
> +#include <linux/overflow.h>
> +#include <clock.h>
> +#include <driver.h>
> +#include <io.h>
> +#include <linux/nvmem-provider.h>
> +#include <of.h>
> +#include <init.h>
> +
> +#define clk_prepare_enable clk_enable
> +#define clk_disable_unprepare clk_disable
Please use the functions directly.
> +static int rockchip_efuse_probe(struct device_d *dev)
> +{
> + struct resource *res;
> + struct nvmem_device *nvmem;
> + struct rockchip_efuse_chip *efuse;
> + const void *data;
> +
> + data = device_get_match_data(dev);
> + if (!data) {
> + dev_err(dev, "failed to get match data\n");
> + return -EINVAL;
> + }
> +
> + efuse = kzalloc(sizeof(struct rockchip_efuse_chip), GFP_KERNEL);
> + if (!efuse)
> + return -ENOMEM;
> +
> + res = dev_request_mem_resource(dev, 0);
> + if (IS_ERR(res))
> + return PTR_ERR(res);
> +
> + efuse->base = IOMEM(res->start);
> +
> + efuse->clk = clk_get(dev, "pclk_efuse");
> + if (IS_ERR(efuse->clk))
> + return PTR_ERR(efuse->clk);
> +
> + efuse->dev = dev;
> + if (of_property_read_u32(dev->device_node, "rockchip,efuse-size",
> + &econfig.size))
> + econfig.size = resource_size(res);
resource_size(res) is the size of the register space which has nothing
to do with the size of the provided nvmem space.
Sascha
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