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// 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);
skip = 0;
bytes -= copy_size;
val += copy_size;
offset += OTP_NV_ALIGN;
}
return 0;
}
static const struct nvmem_bus kvx_otp_nv_bus = {
.read = kvx_otp_nv_read,
};
static const struct of_device_id kvx_otp_nv_match[] = {
{ .compatible = "kalray,kvx-otp-nv" },
{ /* sentinel */},
};
static int kvx_otp_nv_probe(struct device_d *dev)
{
struct resource *res;
struct nvmem_device *nvmem;
struct nvmem_config econfig = { 0 };
struct kvx_otp_nv_priv *priv;
priv = kzalloc(sizeof(*priv), GFP_KERNEL);
if (!priv)
return -ENOMEM;
res = dev_request_mem_resource(dev, 0);
if (IS_ERR(res))
return PTR_ERR(res);
priv->base = IOMEM(res->start);
econfig.name = "kvx-nv-regbank";
econfig.stride = 1;
econfig.word_size = 1;
econfig.size = resource_size(res);
econfig.dev = dev;
econfig.priv = priv;
econfig.bus = &kvx_otp_nv_bus;
dev->priv = priv;
nvmem = nvmem_register(&econfig);
return PTR_ERR_OR_ZERO(nvmem);
}
static struct driver_d kvx_otp_nv_driver = {
.name = "kvx-otp-nv",
.probe = kvx_otp_nv_probe,
.of_compatible = DRV_OF_COMPAT(kvx_otp_nv_match),
};
postcore_platform_driver(kvx_otp_nv_driver);
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