2012-05-02 15:16:38 +00:00
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/*
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* This file is subject to the terms and conditions of the GNU General Public
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* License. See the file "COPYING" in the main directory of this archive
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* for more details.
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*
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* Copyright (C) 2011, 2012 Cavium, Inc.
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*/
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#include <linux/platform_device.h>
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#include <linux/mdio-mux.h>
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#include <linux/of_mdio.h>
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#include <linux/device.h>
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#include <linux/module.h>
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#include <linux/phy.h>
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#define DRV_DESCRIPTION "MDIO bus multiplexer driver"
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struct mdio_mux_child_bus;
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struct mdio_mux_parent_bus {
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struct mii_bus *mii_bus;
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int current_child;
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int parent_id;
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void *switch_data;
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int (*switch_fn)(int current_child, int desired_child, void *data);
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/* List of our children linked through their next fields. */
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struct mdio_mux_child_bus *children;
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};
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struct mdio_mux_child_bus {
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struct mii_bus *mii_bus;
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struct mdio_mux_parent_bus *parent;
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struct mdio_mux_child_bus *next;
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int bus_number;
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};
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/*
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* The parent bus' lock is used to order access to the switch_fn.
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*/
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static int mdio_mux_read(struct mii_bus *bus, int phy_id, int regnum)
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{
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struct mdio_mux_child_bus *cb = bus->priv;
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struct mdio_mux_parent_bus *pb = cb->parent;
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int r;
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2016-04-11 19:40:05 +00:00
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mutex_lock_nested(&pb->mii_bus->mdio_lock, MDIO_MUTEX_MUX);
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2012-05-02 15:16:38 +00:00
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r = pb->switch_fn(pb->current_child, cb->bus_number, pb->switch_data);
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if (r)
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goto out;
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pb->current_child = cb->bus_number;
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r = pb->mii_bus->read(pb->mii_bus, phy_id, regnum);
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out:
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mutex_unlock(&pb->mii_bus->mdio_lock);
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return r;
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}
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/*
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* The parent bus' lock is used to order access to the switch_fn.
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*/
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static int mdio_mux_write(struct mii_bus *bus, int phy_id,
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int regnum, u16 val)
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{
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struct mdio_mux_child_bus *cb = bus->priv;
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struct mdio_mux_parent_bus *pb = cb->parent;
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int r;
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2016-04-11 19:40:05 +00:00
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mutex_lock_nested(&pb->mii_bus->mdio_lock, MDIO_MUTEX_MUX);
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2012-05-02 15:16:38 +00:00
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r = pb->switch_fn(pb->current_child, cb->bus_number, pb->switch_data);
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if (r)
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goto out;
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pb->current_child = cb->bus_number;
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r = pb->mii_bus->write(pb->mii_bus, phy_id, regnum, val);
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out:
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mutex_unlock(&pb->mii_bus->mdio_lock);
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return r;
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}
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static int parent_count;
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int mdio_mux_init(struct device *dev,
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int (*switch_fn)(int cur, int desired, void *data),
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void **mux_handle,
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2016-06-10 05:33:45 +00:00
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void *data,
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struct mii_bus *mux_bus)
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2012-05-02 15:16:38 +00:00
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{
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struct device_node *parent_bus_node;
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struct device_node *child_bus_node;
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int r, ret_val;
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struct mii_bus *parent_bus;
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struct mdio_mux_parent_bus *pb;
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struct mdio_mux_child_bus *cb;
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if (!dev->of_node)
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return -ENODEV;
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2016-06-10 05:33:45 +00:00
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if (!mux_bus) {
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parent_bus_node = of_parse_phandle(dev->of_node,
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"mdio-parent-bus", 0);
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2012-05-02 15:16:38 +00:00
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2016-06-10 05:33:45 +00:00
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if (!parent_bus_node)
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return -ENODEV;
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parent_bus = of_mdio_find_bus(parent_bus_node);
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if (!parent_bus) {
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ret_val = -EPROBE_DEFER;
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goto err_parent_bus;
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}
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} else {
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2016-06-14 10:03:17 +00:00
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parent_bus_node = NULL;
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2016-06-10 05:33:45 +00:00
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parent_bus = mux_bus;
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}
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2012-05-02 15:16:38 +00:00
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pb = devm_kzalloc(dev, sizeof(*pb), GFP_KERNEL);
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2017-09-01 11:56:00 +00:00
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if (!pb) {
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2012-05-02 15:16:38 +00:00
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ret_val = -ENOMEM;
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2017-05-10 15:20:27 +00:00
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goto err_pb_kz;
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2012-05-02 15:16:38 +00:00
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}
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pb->switch_data = data;
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pb->switch_fn = switch_fn;
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pb->current_child = -1;
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pb->parent_id = parent_count++;
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pb->mii_bus = parent_bus;
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ret_val = -ENODEV;
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2012-08-14 13:20:24 +00:00
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for_each_available_child_of_node(dev->of_node, child_bus_node) {
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2017-06-05 18:08:04 +00:00
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int v;
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2012-05-02 15:16:38 +00:00
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2017-07-10 12:35:23 +00:00
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r = of_property_read_u32(child_bus_node, "reg", &v);
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if (r) {
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2017-05-31 19:44:50 +00:00
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dev_err(dev,
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2017-07-18 21:43:19 +00:00
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"Error: Failed to find reg for child %pOF\n",
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child_bus_node);
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2012-05-02 15:16:38 +00:00
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continue;
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2017-05-31 19:44:50 +00:00
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}
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2012-05-02 15:16:38 +00:00
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cb = devm_kzalloc(dev, sizeof(*cb), GFP_KERNEL);
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2017-09-01 11:56:00 +00:00
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if (!cb) {
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2012-05-02 15:16:38 +00:00
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ret_val = -ENOMEM;
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2017-05-31 19:44:50 +00:00
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continue;
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2012-05-02 15:16:38 +00:00
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}
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cb->bus_number = v;
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cb->parent = pb;
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2015-12-14 12:51:51 +00:00
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2012-05-02 15:16:38 +00:00
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cb->mii_bus = mdiobus_alloc();
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2015-12-14 12:51:51 +00:00
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if (!cb->mii_bus) {
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ret_val = -ENOMEM;
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2017-05-10 15:20:27 +00:00
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devm_kfree(dev, cb);
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2017-05-31 19:44:50 +00:00
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continue;
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2015-12-14 12:51:51 +00:00
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}
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2012-05-02 15:16:38 +00:00
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cb->mii_bus->priv = cb;
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2016-01-06 19:11:15 +00:00
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2012-05-02 15:16:38 +00:00
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cb->mii_bus->name = "mdio_mux";
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snprintf(cb->mii_bus->id, MII_BUS_ID_SIZE, "%x.%x",
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pb->parent_id, v);
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cb->mii_bus->parent = dev;
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cb->mii_bus->read = mdio_mux_read;
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cb->mii_bus->write = mdio_mux_write;
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r = of_mdiobus_register(cb->mii_bus, child_bus_node);
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if (r) {
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2017-05-31 19:44:50 +00:00
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dev_err(dev,
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2017-07-18 21:43:19 +00:00
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"Error: Failed to register MDIO bus for child %pOF\n",
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child_bus_node);
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2012-05-02 15:16:38 +00:00
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mdiobus_free(cb->mii_bus);
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devm_kfree(dev, cb);
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} else {
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cb->next = pb->children;
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pb->children = cb;
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}
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}
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if (pb->children) {
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*mux_handle = pb;
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return 0;
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}
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2015-09-24 19:35:52 +00:00
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2017-05-31 19:44:50 +00:00
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dev_err(dev, "Error: No acceptable child buses found\n");
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2017-05-10 15:20:27 +00:00
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devm_kfree(dev, pb);
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err_pb_kz:
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2015-09-24 19:35:52 +00:00
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/* balance the reference of_mdio_find_bus() took */
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2017-05-10 15:20:27 +00:00
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if (!mux_bus)
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put_device(&parent_bus->dev);
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2012-05-02 15:16:38 +00:00
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err_parent_bus:
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2016-06-14 10:03:17 +00:00
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of_node_put(parent_bus_node);
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2012-05-02 15:16:38 +00:00
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return ret_val;
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}
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EXPORT_SYMBOL_GPL(mdio_mux_init);
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void mdio_mux_uninit(void *mux_handle)
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{
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struct mdio_mux_parent_bus *pb = mux_handle;
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struct mdio_mux_child_bus *cb = pb->children;
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while (cb) {
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mdiobus_unregister(cb->mii_bus);
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mdiobus_free(cb->mii_bus);
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cb = cb->next;
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}
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2015-09-24 19:35:52 +00:00
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/* balance the reference of_mdio_find_bus() in mdio_mux_init() took */
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put_device(&pb->mii_bus->dev);
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2012-05-02 15:16:38 +00:00
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}
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EXPORT_SYMBOL_GPL(mdio_mux_uninit);
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MODULE_DESCRIPTION(DRV_DESCRIPTION);
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MODULE_AUTHOR("David Daney");
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MODULE_LICENSE("GPL");
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