mdio_mux_sandbox.c
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// SPDX-License-Identifier: GPL-2.0+
/*
* (C) Copyright 2019
* Alex Marginean, NXP
*/
#include <dm.h>
#include <errno.h>
#include <miiphy.h>
/* macros copied over from mdio_sandbox.c */
#define SANDBOX_PHY_ADDR 5
#define SANDBOX_PHY_REG_CNT 2
struct mdio_mux_sandbox_priv {
int enabled;
int sel;
};
static int mdio_mux_sandbox_mark_selection(struct udevice *dev, int sel)
{
struct udevice *mdio;
struct mdio_ops *ops;
int err;
/*
* find the sandbox parent mdio and write a register on the PHY there
* so the mux test can verify selection.
*/
err = uclass_get_device_by_name(UCLASS_MDIO, "mdio-test", &mdio);
if (err)
return err;
ops = mdio_get_ops(mdio);
return ops->write(mdio, SANDBOX_PHY_ADDR, MDIO_DEVAD_NONE,
SANDBOX_PHY_REG_CNT - 1, (u16)sel);
}
static int mdio_mux_sandbox_select(struct udevice *dev, int cur, int sel)
{
struct mdio_mux_sandbox_priv *priv = dev_get_priv(dev);
if (!priv->enabled)
return -ENODEV;
if (cur != priv->sel)
return -EINVAL;
priv->sel = sel;
mdio_mux_sandbox_mark_selection(dev, priv->sel);
return 0;
}
static int mdio_mux_sandbox_deselect(struct udevice *dev, int sel)
{
struct mdio_mux_sandbox_priv *priv = dev_get_priv(dev);
if (!priv->enabled)
return -ENODEV;
if (sel != priv->sel)
return -EINVAL;
priv->sel = -1;
mdio_mux_sandbox_mark_selection(dev, priv->sel);
return 0;
}
static const struct mdio_mux_ops mdio_mux_sandbox_ops = {
.select = mdio_mux_sandbox_select,
.deselect = mdio_mux_sandbox_deselect,
};
static int mdio_mux_sandbox_probe(struct udevice *dev)
{
struct mdio_mux_sandbox_priv *priv = dev_get_priv(dev);
priv->enabled = 1;
priv->sel = -1;
return 0;
}
static const struct udevice_id mdio_mux_sandbox_ids[] = {
{ .compatible = "sandbox,mdio-mux" },
{ }
};
U_BOOT_DRIVER(mdio_mux_sandbox) = {
.name = "mdio_mux_sandbox",
.id = UCLASS_MDIO_MUX,
.of_match = mdio_mux_sandbox_ids,
.probe = mdio_mux_sandbox_probe,
.ops = &mdio_mux_sandbox_ops,
.priv_auto_alloc_size = sizeof(struct mdio_mux_sandbox_priv),
};