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/*
* Copyright (c) 2015 Pengutronix, Steffen Trumtrar <kernel@pengutronix.de>
* Copyright (c) 2017 Pengutronix, Oleksij Rempel <kernel@pengutronix.de>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2
* as published by the Free Software Foundation.
*/
#include <common.h>
#include <driver.h>
#include <init.h>
#include <io.h>
#include <of.h>
#include <malloc.h>
#include <regmap.h>
#include <mfd/syscon.h>
#include <linux/nvmem-provider.h>
struct snvs_lpgpr_priv {
struct device_d *dev;
struct regmap *regmap;
int offset;
struct nvmem_config cfg;
};
static int snvs_lpgpr_write(struct device_d *dev, const int reg,
const void *_val, int bytes)
{
struct snvs_lpgpr_priv *priv = dev->parent->priv;
const u32 *val = _val;
int i = 0, words = bytes / 4;
while (words--)
regmap_write(priv->regmap, priv->offset + reg + (i++ * 4),
*val++);
return 0;
}
static int snvs_lpgpr_read(struct device_d *dev, const int reg, void *_val,
int bytes)
{
struct snvs_lpgpr_priv *priv = dev->parent->priv;
u32 *val = _val;
int i = 0, words = bytes / 4;
while (words--)
regmap_read(priv->regmap, priv->offset + reg + (i++ * 4),
val++);
return 0;
}
static const struct nvmem_bus snvs_lpgpr_nvmem_bus = {
.write = snvs_lpgpr_write,
.read = snvs_lpgpr_read,
};
static int snvs_lpgpr_probe(struct device_d *dev)
{
struct device_node *node = dev->device_node;
struct snvs_lpgpr_priv *priv;
struct nvmem_config *cfg;
struct nvmem_device *nvmem;
int err;
if (!node)
return -ENOENT;
priv = kzalloc(sizeof(*priv), GFP_KERNEL);
if (!priv)
return -ENOMEM;
priv->regmap = syscon_node_to_regmap(of_get_parent(node));
if (IS_ERR(priv->regmap)) {
free(priv);
return PTR_ERR(priv->regmap);
}
err = of_property_read_u32(node, "offset", &priv->offset);
if (err)
return err;
cfg = &priv->cfg;
cfg->name = dev_name(dev);
cfg->dev = dev;
cfg->stride = 4,
cfg->word_size = 4,
cfg->size = 4,
cfg->bus = &snvs_lpgpr_nvmem_bus,
nvmem = nvmem_register(cfg);
if (IS_ERR(nvmem)) {
free(priv);
return PTR_ERR(nvmem);
}
dev->priv = priv;
return 0;
}
static __maybe_unused struct of_device_id snvs_lpgpr_dt_ids[] = {
{ .compatible = "fsl,imx6sl-snvs-lpgpr", },
{ .compatible = "fsl,imx6q-snvs-lpgpr", },
{ },
};
static struct driver_d snvs_lpgpr_driver = {
.name = "nvmem-snvs-lpgpr",
.probe = snvs_lpgpr_probe,
.of_compatible = DRV_OF_COMPAT(snvs_lpgpr_dt_ids),
};
device_platform_driver(snvs_lpgpr_driver);
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