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// SPDX-License-Identifier: GPL-2.0-only
/*
* Copyright (c) 2017 Zodiac Inflight Innovation
* Author: Andrey Smirnov <andrew.smirnov@gmail.com>
*
* Based on analogous code from Linux kernel
*
* Copyright (C) 2011, 2012 Cavium, Inc.
*/
#include <common.h>
#include <linux/mdio-mux.h>
#include <linux/phy.h>
struct mdio_mux_parent_bus {
struct mii_bus *mii_bus;
int current_child;
int parent_id;
void *switch_data;
int (*switch_fn)(int current_child, int desired_child, void *data);
};
struct mdio_mux_child_bus {
struct mii_bus mii_bus;
struct mdio_mux_parent_bus *parent;
struct mdio_mux_child_bus *next;
int bus_number;
};
static int mdio_mux_read_or_write(struct mii_bus *bus, int phy_id,
int regnum, u16 *val)
{
struct mdio_mux_child_bus *cb = bus->priv;
struct mdio_mux_parent_bus *pb = cb->parent;
int r;
r = pb->switch_fn(pb->current_child, cb->bus_number, pb->switch_data);
if (!r) {
pb->current_child = cb->bus_number;
if (val)
r = pb->mii_bus->write(pb->mii_bus, phy_id,
regnum, *val);
else
r = pb->mii_bus->read(pb->mii_bus, phy_id,
regnum);
}
return r;
}
static int mdio_mux_read(struct mii_bus *bus, int phy_id, int regnum)
{
return mdio_mux_read_or_write(bus, phy_id, regnum, NULL);
}
static int mdio_mux_write(struct mii_bus *bus, int phy_id,
int regnum, u16 val)
{
return mdio_mux_read_or_write(bus, phy_id, regnum, &val);
}
int mdio_mux_init(struct device_d *dev,
struct device_node *mux_node,
int (*switch_fn)(int cur, int desired, void *data),
void *data,
struct mii_bus *mux_bus)
{
static int parent_count = 0;
struct device_node *parent_bus_node;
struct device_node *child_bus_node;
struct mdio_mux_parent_bus *pb;
struct mdio_mux_child_bus *cb;
struct mii_bus *parent_bus;
int r;
if (!mux_node)
return -ENODEV;
if (!mux_bus) {
parent_bus_node = of_parse_phandle(mux_node,
"mdio-parent-bus", 0);
if (!parent_bus_node)
return -ENODEV;
parent_bus = of_mdio_find_bus(parent_bus_node);
if (!parent_bus)
return -EPROBE_DEFER;
} else {
parent_bus_node = NULL;
parent_bus = mux_bus;
}
pb = xzalloc(sizeof(*pb));
pb->switch_data = data;
pb->switch_fn = switch_fn;
pb->current_child = -1;
pb->parent_id = parent_count++;
pb->mii_bus = parent_bus;
for_each_available_child_of_node(mux_node, child_bus_node) {
int v;
r = of_property_read_u32(child_bus_node, "reg", &v);
if (r) {
dev_err(dev,
"Error: Failed to find reg for child %pOF\n",
child_bus_node);
continue;
}
cb = xzalloc(sizeof(*cb));
cb->bus_number = v;
cb->parent = pb;
cb->mii_bus.priv = cb;
cb->mii_bus.parent = dev;
cb->mii_bus.read = mdio_mux_read;
cb->mii_bus.write = mdio_mux_write;
cb->mii_bus.dev.device_node = child_bus_node;
r = mdiobus_register(&cb->mii_bus);
if (r) {
dev_err(dev,
"Error: Failed to register MDIO bus for child %pOF\n",
child_bus_node);
}
}
parent_bus->is_multiplexed = true;
return 0;
}
EXPORT_SYMBOL_GPL(mdio_mux_init);
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