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// SPDX-License-Identifier: GPL-2.0-or-later
/* Driver for MMIO-Mapped MDIO devices. Some IPs expose internal PHYs or PCS
* within the MMIO-mapped area
*
* Copyright (C) 2023 Maxime Chevallier <maxime.chevallier@bootlin.com>
*/
#include <linux/bitfield.h>
#include <linux/delay.h>
#include <linux/mdio.h>
#include <linux/module.h>
#include <linux/of.h>
#include <linux/of_mdio.h>
#include <linux/phy.h>
#include <linux/platform_device.h>
#include <linux/regmap.h>
#include <linux/mdio/mdio-regmap.h>
#define DRV_NAME "mdio-regmap"
struct mdio_regmap_priv {
struct regmap *regmap;
u8 valid_addr;
};
static int mdio_regmap_read_c22(struct mii_bus *bus, int addr, int regnum)
{
struct mdio_regmap_priv *ctx = bus->priv;
unsigned int val;
int ret;
if (ctx->valid_addr != addr)
return -ENODEV;
ret = regmap_read(ctx->regmap, regnum, &val);
if (ret < 0)
return ret;
return val;
}
static int mdio_regmap_write_c22(struct mii_bus *bus, int addr, int regnum,
u16 val)
{
struct mdio_regmap_priv *ctx = bus->priv;
if (ctx->valid_addr != addr)
return -ENODEV;
return regmap_write(ctx->regmap, regnum, val);
}
struct mii_bus *devm_mdio_regmap_register(struct device *dev,
const struct mdio_regmap_config *config)
{
struct mdio_regmap_priv *mr;
struct mii_bus *mii;
int rc;
if (!config->parent)
return ERR_PTR(-EINVAL);
mii = devm_mdiobus_alloc_size(config->parent, sizeof(*mr));
if (!mii)
return ERR_PTR(-ENOMEM);
mr = mii->priv;
mr->regmap = config->regmap;
mr->valid_addr = config->valid_addr;
mii->name = DRV_NAME;
strscpy(mii->id, config->name, MII_BUS_ID_SIZE);
mii->parent = config->parent;
mii->read = mdio_regmap_read_c22;
mii->write = mdio_regmap_write_c22;
if (config->autoscan)
mii->phy_mask = ~BIT(config->valid_addr);
else
mii->phy_mask = ~0;
rc = devm_mdiobus_register(dev, mii);
if (rc) {
dev_err(config->parent, "Cannot register MDIO bus![%s] (%d)\n", mii->id, rc);
return ERR_PTR(rc);
}
return mii;
}
EXPORT_SYMBOL_GPL(devm_mdio_regmap_register);
MODULE_DESCRIPTION("MDIO API over regmap");
MODULE_AUTHOR("Maxime Chevallier <maxime.chevallier@bootlin.com>");
MODULE_LICENSE("GPL");
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