On Fri, Jan 14, 2022 at 05:52:07PM +0100, Jules Maselbas wrote:
> From: Clement Leger <cleger@xxxxxxxxx>
>
> Backport Linux driver to barebox to access nvmem.
>
> Signed-off-by: Clement Leger <cleger@xxxxxxxxx>
> Signed-off-by: Jules Maselbas <jmaselbas@xxxxxxxxx>
> ---
> drivers/nvmem/Kconfig | 7 +++
> drivers/nvmem/Makefile | 3 ++
> drivers/nvmem/kvx-otp-nv.c | 99 ++++++++++++++++++++++++++++++++++++++
> 3 files changed, 109 insertions(+)
> create mode 100644 drivers/nvmem/kvx-otp-nv.c
>
> diff --git a/drivers/nvmem/Kconfig b/drivers/nvmem/Kconfig
> index 07320101b8..3624cc64b6 100644
> --- a/drivers/nvmem/Kconfig
> +++ b/drivers/nvmem/Kconfig
> @@ -66,6 +66,13 @@ config STM32_BSEC
> This adds support for the STM32 OTP controller. Reads and writes
> to will go to the shadow RAM, not the OTP fuses themselvers.
>
> +config KVX_OTP_NV
> + tristate "kalray KVX OTP Non volatile regs Support"
> + depends on KVX
> + help
> + This is a simple driver to dump specified values of KVX OTP non
> + volatile regs.
> +
> config STARFIVE_OTP
> tristate "Starfive OTP Supprot"
> depends on SOC_STARFIVE
> diff --git a/drivers/nvmem/Makefile b/drivers/nvmem/Makefile
> index cd970aaea1..81629ddb27 100644
> --- a/drivers/nvmem/Makefile
> +++ b/drivers/nvmem/Makefile
> @@ -24,4 +24,7 @@ nvmem_eeprom_93xx46-y := eeprom_93xx46.o
> obj-$(CONFIG_STM32_BSEC) += nvmem_bsec.o
> nvmem_bsec-y := bsec.o
>
> +obj-$(CONFIG_KVX_OTP_NV) += nvmem-kvx-otp-nv.o
> +nvmem-kvx-otp-nv-y := kvx-otp-nv.o
> +
> obj-$(CONFIG_STARFIVE_OTP) += starfive-otp.o
> diff --git a/drivers/nvmem/kvx-otp-nv.c b/drivers/nvmem/kvx-otp-nv.c
> new file mode 100644
> index 0000000000..f997f8a63b
> --- /dev/null
> +++ b/drivers/nvmem/kvx-otp-nv.c
> @@ -0,0 +1,99 @@
> +// SPDX-License-Identifier: GPL-2.0-or-later
> +/*
> + * Copyright (C) 2020 Kalray Inc., Clément Léger
> + */
> +
> +#include <common.h>
> +#include <driver.h>
> +#include <malloc.h>
> +#include <xfuncs.h>
> +#include <errno.h>
> +#include <init.h>
> +#include <net.h>
> +#include <io.h>
> +
> +#include <linux/nvmem-provider.h>
> +
> +#define OTP_NV_ALIGN 4
> +#define OTP_NV_ALIGN_MASK (OTP_NV_ALIGN - 1)
> +
> +struct kvx_otp_nv_priv {
> + void __iomem *base;
> +};
> +
> +static int kvx_otp_nv_read(void *context, unsigned int offset,
> + void *_val, size_t bytes)
> +{
> + struct kvx_otp_nv_priv *priv = context;
> + u8 *val = _val;
> + u32 tmp, copy_size;
> + u8 skip = offset & OTP_NV_ALIGN_MASK;
> +
> + offset &= ~OTP_NV_ALIGN_MASK;
> +
> + while (bytes) {
> + tmp = readl(priv->base + offset);
> + if (skip != 0)
> + copy_size = min(OTP_NV_ALIGN - skip, (int) bytes);
> + else
> + copy_size = min(bytes, sizeof(tmp));
> +
> + memcpy(val, ((u8 *) &tmp) + skip, copy_size);
> + if (skip != 0)
> + skip = 0;
The if() here is unnecessary.
Sascha
--
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