1033 lines
26 KiB
C
1033 lines
26 KiB
C
// SPDX-License-Identifier: GPL-2.0+
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/* MDIO Bus interface
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*
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* Author: Andy Fleming
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*
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* Copyright (c) 2004 Freescale Semiconductor, Inc.
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*/
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#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
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#include <linux/delay.h>
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#include <linux/device.h>
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#include <linux/errno.h>
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#include <linux/etherdevice.h>
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#include <linux/ethtool.h>
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#include <linux/gpio.h>
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#include <linux/gpio/consumer.h>
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#include <linux/init.h>
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#include <linux/interrupt.h>
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#include <linux/io.h>
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#include <linux/kernel.h>
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#include <linux/mii.h>
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#include <linux/mm.h>
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#include <linux/module.h>
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#include <linux/netdevice.h>
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#include <linux/of_device.h>
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#include <linux/of_gpio.h>
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#include <linux/of_mdio.h>
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#include <linux/phy.h>
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#include <linux/reset.h>
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#include <linux/skbuff.h>
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#include <linux/slab.h>
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#include <linux/spinlock.h>
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#include <linux/string.h>
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#include <linux/uaccess.h>
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#include <linux/unistd.h>
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#define CREATE_TRACE_POINTS
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#include <trace/events/mdio.h>
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#include "mdio-boardinfo.h"
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static int mdiobus_register_gpiod(struct mdio_device *mdiodev)
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{
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/* Deassert the optional reset signal */
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mdiodev->reset_gpio = gpiod_get_optional(&mdiodev->dev,
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"reset", GPIOD_OUT_LOW);
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if (IS_ERR(mdiodev->reset_gpio))
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return PTR_ERR(mdiodev->reset_gpio);
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if (mdiodev->reset_gpio)
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gpiod_set_consumer_name(mdiodev->reset_gpio, "PHY reset");
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return 0;
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}
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static int mdiobus_register_reset(struct mdio_device *mdiodev)
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{
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struct reset_control *reset;
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reset = reset_control_get_optional_exclusive(&mdiodev->dev, "phy");
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if (IS_ERR(reset))
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return PTR_ERR(reset);
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mdiodev->reset_ctrl = reset;
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return 0;
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}
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int mdiobus_register_device(struct mdio_device *mdiodev)
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{
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int err;
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if (mdiodev->bus->mdio_map[mdiodev->addr])
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return -EBUSY;
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if (mdiodev->flags & MDIO_DEVICE_FLAG_PHY) {
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err = mdiobus_register_gpiod(mdiodev);
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if (err)
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return err;
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err = mdiobus_register_reset(mdiodev);
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if (err)
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return err;
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/* Assert the reset signal */
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mdio_device_reset(mdiodev, 1);
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}
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mdiodev->bus->mdio_map[mdiodev->addr] = mdiodev;
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return 0;
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}
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EXPORT_SYMBOL(mdiobus_register_device);
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int mdiobus_unregister_device(struct mdio_device *mdiodev)
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{
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if (mdiodev->bus->mdio_map[mdiodev->addr] != mdiodev)
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return -EINVAL;
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reset_control_put(mdiodev->reset_ctrl);
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mdiodev->bus->mdio_map[mdiodev->addr] = NULL;
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return 0;
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}
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EXPORT_SYMBOL(mdiobus_unregister_device);
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struct phy_device *mdiobus_get_phy(struct mii_bus *bus, int addr)
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{
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struct mdio_device *mdiodev = bus->mdio_map[addr];
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if (!mdiodev)
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return NULL;
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if (!(mdiodev->flags & MDIO_DEVICE_FLAG_PHY))
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return NULL;
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return container_of(mdiodev, struct phy_device, mdio);
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}
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EXPORT_SYMBOL(mdiobus_get_phy);
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bool mdiobus_is_registered_device(struct mii_bus *bus, int addr)
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{
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return bus->mdio_map[addr];
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}
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EXPORT_SYMBOL(mdiobus_is_registered_device);
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/**
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* mdiobus_alloc_size - allocate a mii_bus structure
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* @size: extra amount of memory to allocate for private storage.
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* If non-zero, then bus->priv is points to that memory.
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*
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* Description: called by a bus driver to allocate an mii_bus
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* structure to fill in.
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*/
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struct mii_bus *mdiobus_alloc_size(size_t size)
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{
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struct mii_bus *bus;
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size_t aligned_size = ALIGN(sizeof(*bus), NETDEV_ALIGN);
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size_t alloc_size;
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int i;
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/* If we alloc extra space, it should be aligned */
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if (size)
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alloc_size = aligned_size + size;
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else
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alloc_size = sizeof(*bus);
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bus = kzalloc(alloc_size, GFP_KERNEL);
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if (!bus)
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return NULL;
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bus->state = MDIOBUS_ALLOCATED;
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if (size)
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bus->priv = (void *)bus + aligned_size;
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/* Initialise the interrupts to polling and 64-bit seqcounts */
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for (i = 0; i < PHY_MAX_ADDR; i++) {
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bus->irq[i] = PHY_POLL;
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u64_stats_init(&bus->stats[i].syncp);
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}
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return bus;
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}
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EXPORT_SYMBOL(mdiobus_alloc_size);
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/**
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* mdiobus_release - mii_bus device release callback
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* @d: the target struct device that contains the mii_bus
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*
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* Description: called when the last reference to an mii_bus is
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* dropped, to free the underlying memory.
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*/
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static void mdiobus_release(struct device *d)
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{
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struct mii_bus *bus = to_mii_bus(d);
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BUG_ON(bus->state != MDIOBUS_RELEASED &&
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/* for compatibility with error handling in drivers */
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bus->state != MDIOBUS_ALLOCATED);
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kfree(bus);
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}
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struct mdio_bus_stat_attr {
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int addr;
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unsigned int field_offset;
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};
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static u64 mdio_bus_get_stat(struct mdio_bus_stats *s, unsigned int offset)
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{
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const char *p = (const char *)s + offset;
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unsigned int start;
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u64 val = 0;
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do {
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start = u64_stats_fetch_begin(&s->syncp);
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val = u64_stats_read((const u64_stats_t *)p);
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} while (u64_stats_fetch_retry(&s->syncp, start));
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return val;
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}
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static u64 mdio_bus_get_global_stat(struct mii_bus *bus, unsigned int offset)
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{
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unsigned int i;
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u64 val = 0;
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for (i = 0; i < PHY_MAX_ADDR; i++)
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val += mdio_bus_get_stat(&bus->stats[i], offset);
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return val;
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}
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static ssize_t mdio_bus_stat_field_show(struct device *dev,
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struct device_attribute *attr,
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char *buf)
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{
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struct mii_bus *bus = to_mii_bus(dev);
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struct mdio_bus_stat_attr *sattr;
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struct dev_ext_attribute *eattr;
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u64 val;
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eattr = container_of(attr, struct dev_ext_attribute, attr);
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sattr = eattr->var;
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if (sattr->addr < 0)
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val = mdio_bus_get_global_stat(bus, sattr->field_offset);
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else
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val = mdio_bus_get_stat(&bus->stats[sattr->addr],
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sattr->field_offset);
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return sprintf(buf, "%llu\n", val);
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}
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static ssize_t mdio_bus_device_stat_field_show(struct device *dev,
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struct device_attribute *attr,
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char *buf)
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{
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struct mdio_device *mdiodev = to_mdio_device(dev);
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struct mii_bus *bus = mdiodev->bus;
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struct mdio_bus_stat_attr *sattr;
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struct dev_ext_attribute *eattr;
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int addr = mdiodev->addr;
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u64 val;
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eattr = container_of(attr, struct dev_ext_attribute, attr);
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sattr = eattr->var;
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val = mdio_bus_get_stat(&bus->stats[addr], sattr->field_offset);
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return sprintf(buf, "%llu\n", val);
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}
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#define MDIO_BUS_STATS_ATTR_DECL(field, file) \
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static struct dev_ext_attribute dev_attr_mdio_bus_##field = { \
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.attr = { .attr = { .name = file, .mode = 0444 }, \
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.show = mdio_bus_stat_field_show, \
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}, \
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.var = &((struct mdio_bus_stat_attr) { \
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-1, offsetof(struct mdio_bus_stats, field) \
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}), \
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}; \
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static struct dev_ext_attribute dev_attr_mdio_bus_device_##field = { \
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.attr = { .attr = { .name = file, .mode = 0444 }, \
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.show = mdio_bus_device_stat_field_show, \
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}, \
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.var = &((struct mdio_bus_stat_attr) { \
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-1, offsetof(struct mdio_bus_stats, field) \
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}), \
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};
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#define MDIO_BUS_STATS_ATTR(field) \
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MDIO_BUS_STATS_ATTR_DECL(field, __stringify(field))
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MDIO_BUS_STATS_ATTR(transfers);
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MDIO_BUS_STATS_ATTR(errors);
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MDIO_BUS_STATS_ATTR(writes);
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MDIO_BUS_STATS_ATTR(reads);
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#define MDIO_BUS_STATS_ADDR_ATTR_DECL(field, addr, file) \
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static struct dev_ext_attribute dev_attr_mdio_bus_addr_##field##_##addr = { \
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.attr = { .attr = { .name = file, .mode = 0444 }, \
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.show = mdio_bus_stat_field_show, \
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}, \
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.var = &((struct mdio_bus_stat_attr) { \
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addr, offsetof(struct mdio_bus_stats, field) \
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}), \
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}
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#define MDIO_BUS_STATS_ADDR_ATTR(field, addr) \
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MDIO_BUS_STATS_ADDR_ATTR_DECL(field, addr, \
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__stringify(field) "_" __stringify(addr))
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#define MDIO_BUS_STATS_ADDR_ATTR_GROUP_DECL(addr) \
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MDIO_BUS_STATS_ADDR_ATTR(transfers, addr); \
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MDIO_BUS_STATS_ADDR_ATTR(errors, addr); \
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MDIO_BUS_STATS_ADDR_ATTR(writes, addr); \
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MDIO_BUS_STATS_ADDR_ATTR(reads, addr) \
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MDIO_BUS_STATS_ADDR_ATTR_GROUP_DECL(0);
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MDIO_BUS_STATS_ADDR_ATTR_GROUP_DECL(1);
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MDIO_BUS_STATS_ADDR_ATTR_GROUP_DECL(2);
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MDIO_BUS_STATS_ADDR_ATTR_GROUP_DECL(3);
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MDIO_BUS_STATS_ADDR_ATTR_GROUP_DECL(4);
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MDIO_BUS_STATS_ADDR_ATTR_GROUP_DECL(5);
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MDIO_BUS_STATS_ADDR_ATTR_GROUP_DECL(6);
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MDIO_BUS_STATS_ADDR_ATTR_GROUP_DECL(7);
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MDIO_BUS_STATS_ADDR_ATTR_GROUP_DECL(8);
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MDIO_BUS_STATS_ADDR_ATTR_GROUP_DECL(9);
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MDIO_BUS_STATS_ADDR_ATTR_GROUP_DECL(10);
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MDIO_BUS_STATS_ADDR_ATTR_GROUP_DECL(11);
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MDIO_BUS_STATS_ADDR_ATTR_GROUP_DECL(12);
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MDIO_BUS_STATS_ADDR_ATTR_GROUP_DECL(13);
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MDIO_BUS_STATS_ADDR_ATTR_GROUP_DECL(14);
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MDIO_BUS_STATS_ADDR_ATTR_GROUP_DECL(15);
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MDIO_BUS_STATS_ADDR_ATTR_GROUP_DECL(16);
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MDIO_BUS_STATS_ADDR_ATTR_GROUP_DECL(17);
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MDIO_BUS_STATS_ADDR_ATTR_GROUP_DECL(18);
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MDIO_BUS_STATS_ADDR_ATTR_GROUP_DECL(19);
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MDIO_BUS_STATS_ADDR_ATTR_GROUP_DECL(20);
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MDIO_BUS_STATS_ADDR_ATTR_GROUP_DECL(21);
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MDIO_BUS_STATS_ADDR_ATTR_GROUP_DECL(22);
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MDIO_BUS_STATS_ADDR_ATTR_GROUP_DECL(23);
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MDIO_BUS_STATS_ADDR_ATTR_GROUP_DECL(24);
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MDIO_BUS_STATS_ADDR_ATTR_GROUP_DECL(25);
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MDIO_BUS_STATS_ADDR_ATTR_GROUP_DECL(26);
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MDIO_BUS_STATS_ADDR_ATTR_GROUP_DECL(27);
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MDIO_BUS_STATS_ADDR_ATTR_GROUP_DECL(28);
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MDIO_BUS_STATS_ADDR_ATTR_GROUP_DECL(29);
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MDIO_BUS_STATS_ADDR_ATTR_GROUP_DECL(30);
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MDIO_BUS_STATS_ADDR_ATTR_GROUP_DECL(31);
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#define MDIO_BUS_STATS_ADDR_ATTR_GROUP(addr) \
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&dev_attr_mdio_bus_addr_transfers_##addr.attr.attr, \
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&dev_attr_mdio_bus_addr_errors_##addr.attr.attr, \
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&dev_attr_mdio_bus_addr_writes_##addr.attr.attr, \
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&dev_attr_mdio_bus_addr_reads_##addr.attr.attr \
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static struct attribute *mdio_bus_statistics_attrs[] = {
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&dev_attr_mdio_bus_transfers.attr.attr,
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&dev_attr_mdio_bus_errors.attr.attr,
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&dev_attr_mdio_bus_writes.attr.attr,
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&dev_attr_mdio_bus_reads.attr.attr,
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MDIO_BUS_STATS_ADDR_ATTR_GROUP(0),
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MDIO_BUS_STATS_ADDR_ATTR_GROUP(1),
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MDIO_BUS_STATS_ADDR_ATTR_GROUP(2),
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MDIO_BUS_STATS_ADDR_ATTR_GROUP(3),
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MDIO_BUS_STATS_ADDR_ATTR_GROUP(4),
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MDIO_BUS_STATS_ADDR_ATTR_GROUP(5),
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MDIO_BUS_STATS_ADDR_ATTR_GROUP(6),
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MDIO_BUS_STATS_ADDR_ATTR_GROUP(7),
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MDIO_BUS_STATS_ADDR_ATTR_GROUP(8),
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MDIO_BUS_STATS_ADDR_ATTR_GROUP(9),
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MDIO_BUS_STATS_ADDR_ATTR_GROUP(10),
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MDIO_BUS_STATS_ADDR_ATTR_GROUP(11),
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MDIO_BUS_STATS_ADDR_ATTR_GROUP(12),
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MDIO_BUS_STATS_ADDR_ATTR_GROUP(13),
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MDIO_BUS_STATS_ADDR_ATTR_GROUP(14),
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MDIO_BUS_STATS_ADDR_ATTR_GROUP(15),
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MDIO_BUS_STATS_ADDR_ATTR_GROUP(16),
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MDIO_BUS_STATS_ADDR_ATTR_GROUP(17),
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MDIO_BUS_STATS_ADDR_ATTR_GROUP(18),
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MDIO_BUS_STATS_ADDR_ATTR_GROUP(19),
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MDIO_BUS_STATS_ADDR_ATTR_GROUP(20),
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MDIO_BUS_STATS_ADDR_ATTR_GROUP(21),
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MDIO_BUS_STATS_ADDR_ATTR_GROUP(22),
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MDIO_BUS_STATS_ADDR_ATTR_GROUP(23),
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MDIO_BUS_STATS_ADDR_ATTR_GROUP(24),
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MDIO_BUS_STATS_ADDR_ATTR_GROUP(25),
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MDIO_BUS_STATS_ADDR_ATTR_GROUP(26),
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MDIO_BUS_STATS_ADDR_ATTR_GROUP(27),
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MDIO_BUS_STATS_ADDR_ATTR_GROUP(28),
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MDIO_BUS_STATS_ADDR_ATTR_GROUP(29),
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MDIO_BUS_STATS_ADDR_ATTR_GROUP(30),
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MDIO_BUS_STATS_ADDR_ATTR_GROUP(31),
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NULL,
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};
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static const struct attribute_group mdio_bus_statistics_group = {
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.name = "statistics",
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.attrs = mdio_bus_statistics_attrs,
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};
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static const struct attribute_group *mdio_bus_groups[] = {
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&mdio_bus_statistics_group,
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NULL,
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};
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static struct class mdio_bus_class = {
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.name = "mdio_bus",
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.dev_release = mdiobus_release,
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.dev_groups = mdio_bus_groups,
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};
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/**
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* mdio_find_bus - Given the name of a mdiobus, find the mii_bus.
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* @mdio_name: The name of a mdiobus.
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*
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* Returns a reference to the mii_bus, or NULL if none found. The
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* embedded struct device will have its reference count incremented,
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* and this must be put_deviced'ed once the bus is finished with.
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*/
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struct mii_bus *mdio_find_bus(const char *mdio_name)
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{
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struct device *d;
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d = class_find_device_by_name(&mdio_bus_class, mdio_name);
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return d ? to_mii_bus(d) : NULL;
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}
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EXPORT_SYMBOL(mdio_find_bus);
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#if IS_ENABLED(CONFIG_OF_MDIO)
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/**
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* of_mdio_find_bus - Given an mii_bus node, find the mii_bus.
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* @mdio_bus_np: Pointer to the mii_bus.
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*
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* Returns a reference to the mii_bus, or NULL if none found. The
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* embedded struct device will have its reference count incremented,
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* and this must be put once the bus is finished with.
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*
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* Because the association of a device_node and mii_bus is made via
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* of_mdiobus_register(), the mii_bus cannot be found before it is
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* registered with of_mdiobus_register().
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*
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*/
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struct mii_bus *of_mdio_find_bus(struct device_node *mdio_bus_np)
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{
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struct device *d;
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if (!mdio_bus_np)
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return NULL;
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d = class_find_device_by_of_node(&mdio_bus_class, mdio_bus_np);
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return d ? to_mii_bus(d) : NULL;
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}
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EXPORT_SYMBOL(of_mdio_find_bus);
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/* Walk the list of subnodes of a mdio bus and look for a node that
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* matches the mdio device's address with its 'reg' property. If
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* found, set the of_node pointer for the mdio device. This allows
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* auto-probed phy devices to be supplied with information passed in
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* via DT.
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*/
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static void of_mdiobus_link_mdiodev(struct mii_bus *bus,
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struct mdio_device *mdiodev)
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{
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struct device *dev = &mdiodev->dev;
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struct device_node *child;
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if (dev->of_node || !bus->dev.of_node)
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return;
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for_each_available_child_of_node(bus->dev.of_node, child) {
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int addr;
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addr = of_mdio_parse_addr(dev, child);
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if (addr < 0)
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continue;
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if (addr == mdiodev->addr) {
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dev->of_node = child;
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dev->fwnode = of_fwnode_handle(child);
|
|
return;
|
|
}
|
|
}
|
|
}
|
|
#else /* !IS_ENABLED(CONFIG_OF_MDIO) */
|
|
static inline void of_mdiobus_link_mdiodev(struct mii_bus *mdio,
|
|
struct mdio_device *mdiodev)
|
|
{
|
|
}
|
|
#endif
|
|
|
|
/**
|
|
* mdiobus_create_device_from_board_info - create a full MDIO device given
|
|
* a mdio_board_info structure
|
|
* @bus: MDIO bus to create the devices on
|
|
* @bi: mdio_board_info structure describing the devices
|
|
*
|
|
* Returns 0 on success or < 0 on error.
|
|
*/
|
|
static int mdiobus_create_device(struct mii_bus *bus,
|
|
struct mdio_board_info *bi)
|
|
{
|
|
struct mdio_device *mdiodev;
|
|
int ret = 0;
|
|
|
|
mdiodev = mdio_device_create(bus, bi->mdio_addr);
|
|
if (IS_ERR(mdiodev))
|
|
return -ENODEV;
|
|
|
|
strncpy(mdiodev->modalias, bi->modalias,
|
|
sizeof(mdiodev->modalias));
|
|
mdiodev->bus_match = mdio_device_bus_match;
|
|
mdiodev->dev.platform_data = (void *)bi->platform_data;
|
|
|
|
ret = mdio_device_register(mdiodev);
|
|
if (ret)
|
|
mdio_device_free(mdiodev);
|
|
|
|
return ret;
|
|
}
|
|
|
|
/**
|
|
* __mdiobus_register - bring up all the PHYs on a given bus and attach them to bus
|
|
* @bus: target mii_bus
|
|
* @owner: module containing bus accessor functions
|
|
*
|
|
* Description: Called by a bus driver to bring up all the PHYs
|
|
* on a given bus, and attach them to the bus. Drivers should use
|
|
* mdiobus_register() rather than __mdiobus_register() unless they
|
|
* need to pass a specific owner module. MDIO devices which are not
|
|
* PHYs will not be brought up by this function. They are expected to
|
|
* to be explicitly listed in DT and instantiated by of_mdiobus_register().
|
|
*
|
|
* Returns 0 on success or < 0 on error.
|
|
*/
|
|
int __mdiobus_register(struct mii_bus *bus, struct module *owner)
|
|
{
|
|
struct mdio_device *mdiodev;
|
|
int i, err;
|
|
struct gpio_desc *gpiod;
|
|
|
|
if (NULL == bus || NULL == bus->name ||
|
|
NULL == bus->read || NULL == bus->write)
|
|
return -EINVAL;
|
|
|
|
BUG_ON(bus->state != MDIOBUS_ALLOCATED &&
|
|
bus->state != MDIOBUS_UNREGISTERED);
|
|
|
|
bus->owner = owner;
|
|
bus->dev.parent = bus->parent;
|
|
bus->dev.class = &mdio_bus_class;
|
|
bus->dev.groups = NULL;
|
|
dev_set_name(&bus->dev, "%s", bus->id);
|
|
|
|
err = device_register(&bus->dev);
|
|
if (err) {
|
|
pr_err("mii_bus %s failed to register\n", bus->id);
|
|
return -EINVAL;
|
|
}
|
|
|
|
mutex_init(&bus->mdio_lock);
|
|
mutex_init(&bus->shared_lock);
|
|
|
|
/* de-assert bus level PHY GPIO reset */
|
|
gpiod = devm_gpiod_get_optional(&bus->dev, "reset", GPIOD_OUT_LOW);
|
|
if (IS_ERR(gpiod)) {
|
|
dev_err(&bus->dev, "mii_bus %s couldn't get reset GPIO\n",
|
|
bus->id);
|
|
device_del(&bus->dev);
|
|
return PTR_ERR(gpiod);
|
|
} else if (gpiod) {
|
|
bus->reset_gpiod = gpiod;
|
|
|
|
gpiod_set_value_cansleep(gpiod, 1);
|
|
fsleep(bus->reset_delay_us);
|
|
gpiod_set_value_cansleep(gpiod, 0);
|
|
if (bus->reset_post_delay_us > 0)
|
|
fsleep(bus->reset_post_delay_us);
|
|
}
|
|
|
|
if (bus->reset) {
|
|
err = bus->reset(bus);
|
|
if (err)
|
|
goto error_reset_gpiod;
|
|
}
|
|
|
|
for (i = 0; i < PHY_MAX_ADDR; i++) {
|
|
if ((bus->phy_mask & (1 << i)) == 0) {
|
|
struct phy_device *phydev;
|
|
|
|
phydev = mdiobus_scan(bus, i);
|
|
if (IS_ERR(phydev) && (PTR_ERR(phydev) != -ENODEV)) {
|
|
err = PTR_ERR(phydev);
|
|
goto error;
|
|
}
|
|
}
|
|
}
|
|
|
|
mdiobus_setup_mdiodev_from_board_info(bus, mdiobus_create_device);
|
|
|
|
bus->state = MDIOBUS_REGISTERED;
|
|
pr_info("%s: probed\n", bus->name);
|
|
return 0;
|
|
|
|
error:
|
|
while (--i >= 0) {
|
|
mdiodev = bus->mdio_map[i];
|
|
if (!mdiodev)
|
|
continue;
|
|
|
|
mdiodev->device_remove(mdiodev);
|
|
mdiodev->device_free(mdiodev);
|
|
}
|
|
error_reset_gpiod:
|
|
/* Put PHYs in RESET to save power */
|
|
if (bus->reset_gpiod)
|
|
gpiod_set_value_cansleep(bus->reset_gpiod, 1);
|
|
|
|
device_del(&bus->dev);
|
|
return err;
|
|
}
|
|
EXPORT_SYMBOL(__mdiobus_register);
|
|
|
|
void mdiobus_unregister(struct mii_bus *bus)
|
|
{
|
|
struct mdio_device *mdiodev;
|
|
int i;
|
|
|
|
BUG_ON(bus->state != MDIOBUS_REGISTERED);
|
|
bus->state = MDIOBUS_UNREGISTERED;
|
|
|
|
for (i = 0; i < PHY_MAX_ADDR; i++) {
|
|
mdiodev = bus->mdio_map[i];
|
|
if (!mdiodev)
|
|
continue;
|
|
|
|
if (mdiodev->reset_gpio)
|
|
gpiod_put(mdiodev->reset_gpio);
|
|
|
|
mdiodev->device_remove(mdiodev);
|
|
mdiodev->device_free(mdiodev);
|
|
}
|
|
|
|
/* Put PHYs in RESET to save power */
|
|
if (bus->reset_gpiod)
|
|
gpiod_set_value_cansleep(bus->reset_gpiod, 1);
|
|
|
|
device_del(&bus->dev);
|
|
}
|
|
EXPORT_SYMBOL(mdiobus_unregister);
|
|
|
|
/**
|
|
* mdiobus_free - free a struct mii_bus
|
|
* @bus: mii_bus to free
|
|
*
|
|
* This function releases the reference to the underlying device
|
|
* object in the mii_bus. If this is the last reference, the mii_bus
|
|
* will be freed.
|
|
*/
|
|
void mdiobus_free(struct mii_bus *bus)
|
|
{
|
|
/* For compatibility with error handling in drivers. */
|
|
if (bus->state == MDIOBUS_ALLOCATED) {
|
|
kfree(bus);
|
|
return;
|
|
}
|
|
|
|
BUG_ON(bus->state != MDIOBUS_UNREGISTERED);
|
|
bus->state = MDIOBUS_RELEASED;
|
|
|
|
put_device(&bus->dev);
|
|
}
|
|
EXPORT_SYMBOL(mdiobus_free);
|
|
|
|
/**
|
|
* mdiobus_scan - scan a bus for MDIO devices.
|
|
* @bus: mii_bus to scan
|
|
* @addr: address on bus to scan
|
|
*
|
|
* This function scans the MDIO bus, looking for devices which can be
|
|
* identified using a vendor/product ID in registers 2 and 3. Not all
|
|
* MDIO devices have such registers, but PHY devices typically
|
|
* do. Hence this function assumes anything found is a PHY, or can be
|
|
* treated as a PHY. Other MDIO devices, such as switches, will
|
|
* probably not be found during the scan.
|
|
*/
|
|
struct phy_device *mdiobus_scan(struct mii_bus *bus, int addr)
|
|
{
|
|
struct phy_device *phydev = ERR_PTR(-ENODEV);
|
|
int err;
|
|
|
|
switch (bus->probe_capabilities) {
|
|
case MDIOBUS_NO_CAP:
|
|
case MDIOBUS_C22:
|
|
phydev = get_phy_device(bus, addr, false);
|
|
break;
|
|
case MDIOBUS_C45:
|
|
phydev = get_phy_device(bus, addr, true);
|
|
break;
|
|
case MDIOBUS_C22_C45:
|
|
phydev = get_phy_device(bus, addr, false);
|
|
if (IS_ERR(phydev))
|
|
phydev = get_phy_device(bus, addr, true);
|
|
break;
|
|
}
|
|
|
|
if (IS_ERR(phydev))
|
|
return phydev;
|
|
|
|
/*
|
|
* For DT, see if the auto-probed phy has a correspoding child
|
|
* in the bus node, and set the of_node pointer in this case.
|
|
*/
|
|
of_mdiobus_link_mdiodev(bus, &phydev->mdio);
|
|
|
|
err = phy_device_register(phydev);
|
|
if (err) {
|
|
phy_device_free(phydev);
|
|
return ERR_PTR(-ENODEV);
|
|
}
|
|
|
|
return phydev;
|
|
}
|
|
EXPORT_SYMBOL(mdiobus_scan);
|
|
|
|
static void mdiobus_stats_acct(struct mdio_bus_stats *stats, bool op, int ret)
|
|
{
|
|
preempt_disable();
|
|
u64_stats_update_begin(&stats->syncp);
|
|
|
|
u64_stats_inc(&stats->transfers);
|
|
if (ret < 0) {
|
|
u64_stats_inc(&stats->errors);
|
|
goto out;
|
|
}
|
|
|
|
if (op)
|
|
u64_stats_inc(&stats->reads);
|
|
else
|
|
u64_stats_inc(&stats->writes);
|
|
out:
|
|
u64_stats_update_end(&stats->syncp);
|
|
preempt_enable();
|
|
}
|
|
|
|
/**
|
|
* __mdiobus_read - Unlocked version of the mdiobus_read function
|
|
* @bus: the mii_bus struct
|
|
* @addr: the phy address
|
|
* @regnum: register number to read
|
|
*
|
|
* Read a MDIO bus register. Caller must hold the mdio bus lock.
|
|
*
|
|
* NOTE: MUST NOT be called from interrupt context.
|
|
*/
|
|
int __mdiobus_read(struct mii_bus *bus, int addr, u32 regnum)
|
|
{
|
|
int retval;
|
|
|
|
WARN_ON_ONCE(!mutex_is_locked(&bus->mdio_lock));
|
|
|
|
retval = bus->read(bus, addr, regnum);
|
|
|
|
trace_mdio_access(bus, 1, addr, regnum, retval, retval);
|
|
mdiobus_stats_acct(&bus->stats[addr], true, retval);
|
|
|
|
return retval;
|
|
}
|
|
EXPORT_SYMBOL(__mdiobus_read);
|
|
|
|
/**
|
|
* __mdiobus_write - Unlocked version of the mdiobus_write function
|
|
* @bus: the mii_bus struct
|
|
* @addr: the phy address
|
|
* @regnum: register number to write
|
|
* @val: value to write to @regnum
|
|
*
|
|
* Write a MDIO bus register. Caller must hold the mdio bus lock.
|
|
*
|
|
* NOTE: MUST NOT be called from interrupt context.
|
|
*/
|
|
int __mdiobus_write(struct mii_bus *bus, int addr, u32 regnum, u16 val)
|
|
{
|
|
int err;
|
|
|
|
WARN_ON_ONCE(!mutex_is_locked(&bus->mdio_lock));
|
|
|
|
err = bus->write(bus, addr, regnum, val);
|
|
|
|
trace_mdio_access(bus, 0, addr, regnum, val, err);
|
|
mdiobus_stats_acct(&bus->stats[addr], false, err);
|
|
|
|
return err;
|
|
}
|
|
EXPORT_SYMBOL(__mdiobus_write);
|
|
|
|
/**
|
|
* __mdiobus_modify_changed - Unlocked version of the mdiobus_modify function
|
|
* @bus: the mii_bus struct
|
|
* @addr: the phy address
|
|
* @regnum: register number to modify
|
|
* @mask: bit mask of bits to clear
|
|
* @set: bit mask of bits to set
|
|
*
|
|
* Read, modify, and if any change, write the register value back to the
|
|
* device. Any error returns a negative number.
|
|
*
|
|
* NOTE: MUST NOT be called from interrupt context.
|
|
*/
|
|
int __mdiobus_modify_changed(struct mii_bus *bus, int addr, u32 regnum,
|
|
u16 mask, u16 set)
|
|
{
|
|
int new, ret;
|
|
|
|
ret = __mdiobus_read(bus, addr, regnum);
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
new = (ret & ~mask) | set;
|
|
if (new == ret)
|
|
return 0;
|
|
|
|
ret = __mdiobus_write(bus, addr, regnum, new);
|
|
|
|
return ret < 0 ? ret : 1;
|
|
}
|
|
EXPORT_SYMBOL_GPL(__mdiobus_modify_changed);
|
|
|
|
/**
|
|
* mdiobus_read_nested - Nested version of the mdiobus_read function
|
|
* @bus: the mii_bus struct
|
|
* @addr: the phy address
|
|
* @regnum: register number to read
|
|
*
|
|
* In case of nested MDIO bus access avoid lockdep false positives by
|
|
* using mutex_lock_nested().
|
|
*
|
|
* NOTE: MUST NOT be called from interrupt context,
|
|
* because the bus read/write functions may wait for an interrupt
|
|
* to conclude the operation.
|
|
*/
|
|
int mdiobus_read_nested(struct mii_bus *bus, int addr, u32 regnum)
|
|
{
|
|
int retval;
|
|
|
|
if (WARN_ON_ONCE(in_interrupt()))
|
|
return -EINVAL;
|
|
|
|
mutex_lock_nested(&bus->mdio_lock, MDIO_MUTEX_NESTED);
|
|
retval = __mdiobus_read(bus, addr, regnum);
|
|
mutex_unlock(&bus->mdio_lock);
|
|
|
|
return retval;
|
|
}
|
|
EXPORT_SYMBOL(mdiobus_read_nested);
|
|
|
|
/**
|
|
* mdiobus_read - Convenience function for reading a given MII mgmt register
|
|
* @bus: the mii_bus struct
|
|
* @addr: the phy address
|
|
* @regnum: register number to read
|
|
*
|
|
* NOTE: MUST NOT be called from interrupt context,
|
|
* because the bus read/write functions may wait for an interrupt
|
|
* to conclude the operation.
|
|
*/
|
|
int mdiobus_read(struct mii_bus *bus, int addr, u32 regnum)
|
|
{
|
|
int retval;
|
|
|
|
if (WARN_ON_ONCE(in_interrupt()))
|
|
return -EINVAL;
|
|
|
|
mutex_lock(&bus->mdio_lock);
|
|
retval = __mdiobus_read(bus, addr, regnum);
|
|
mutex_unlock(&bus->mdio_lock);
|
|
|
|
return retval;
|
|
}
|
|
EXPORT_SYMBOL(mdiobus_read);
|
|
|
|
/**
|
|
* mdiobus_write_nested - Nested version of the mdiobus_write function
|
|
* @bus: the mii_bus struct
|
|
* @addr: the phy address
|
|
* @regnum: register number to write
|
|
* @val: value to write to @regnum
|
|
*
|
|
* In case of nested MDIO bus access avoid lockdep false positives by
|
|
* using mutex_lock_nested().
|
|
*
|
|
* NOTE: MUST NOT be called from interrupt context,
|
|
* because the bus read/write functions may wait for an interrupt
|
|
* to conclude the operation.
|
|
*/
|
|
int mdiobus_write_nested(struct mii_bus *bus, int addr, u32 regnum, u16 val)
|
|
{
|
|
int err;
|
|
|
|
if (WARN_ON_ONCE(in_interrupt()))
|
|
return -EINVAL;
|
|
|
|
mutex_lock_nested(&bus->mdio_lock, MDIO_MUTEX_NESTED);
|
|
err = __mdiobus_write(bus, addr, regnum, val);
|
|
mutex_unlock(&bus->mdio_lock);
|
|
|
|
return err;
|
|
}
|
|
EXPORT_SYMBOL(mdiobus_write_nested);
|
|
|
|
/**
|
|
* mdiobus_write - Convenience function for writing a given MII mgmt register
|
|
* @bus: the mii_bus struct
|
|
* @addr: the phy address
|
|
* @regnum: register number to write
|
|
* @val: value to write to @regnum
|
|
*
|
|
* NOTE: MUST NOT be called from interrupt context,
|
|
* because the bus read/write functions may wait for an interrupt
|
|
* to conclude the operation.
|
|
*/
|
|
int mdiobus_write(struct mii_bus *bus, int addr, u32 regnum, u16 val)
|
|
{
|
|
int err;
|
|
|
|
if (WARN_ON_ONCE(in_interrupt()))
|
|
return -EINVAL;
|
|
|
|
mutex_lock(&bus->mdio_lock);
|
|
err = __mdiobus_write(bus, addr, regnum, val);
|
|
mutex_unlock(&bus->mdio_lock);
|
|
|
|
return err;
|
|
}
|
|
EXPORT_SYMBOL(mdiobus_write);
|
|
|
|
/**
|
|
* mdiobus_modify - Convenience function for modifying a given mdio device
|
|
* register
|
|
* @bus: the mii_bus struct
|
|
* @addr: the phy address
|
|
* @regnum: register number to write
|
|
* @mask: bit mask of bits to clear
|
|
* @set: bit mask of bits to set
|
|
*/
|
|
int mdiobus_modify(struct mii_bus *bus, int addr, u32 regnum, u16 mask, u16 set)
|
|
{
|
|
int err;
|
|
|
|
if (WARN_ON_ONCE(in_interrupt()))
|
|
return -EINVAL;
|
|
|
|
mutex_lock(&bus->mdio_lock);
|
|
err = __mdiobus_modify_changed(bus, addr, regnum, mask, set);
|
|
mutex_unlock(&bus->mdio_lock);
|
|
|
|
return err < 0 ? err : 0;
|
|
}
|
|
EXPORT_SYMBOL_GPL(mdiobus_modify);
|
|
|
|
/**
|
|
* mdio_bus_match - determine if given MDIO driver supports the given
|
|
* MDIO device
|
|
* @dev: target MDIO device
|
|
* @drv: given MDIO driver
|
|
*
|
|
* Description: Given a MDIO device, and a MDIO driver, return 1 if
|
|
* the driver supports the device. Otherwise, return 0. This may
|
|
* require calling the devices own match function, since different classes
|
|
* of MDIO devices have different match criteria.
|
|
*/
|
|
static int mdio_bus_match(struct device *dev, struct device_driver *drv)
|
|
{
|
|
struct mdio_device *mdio = to_mdio_device(dev);
|
|
|
|
if (of_driver_match_device(dev, drv))
|
|
return 1;
|
|
|
|
if (mdio->bus_match)
|
|
return mdio->bus_match(dev, drv);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int mdio_uevent(struct device *dev, struct kobj_uevent_env *env)
|
|
{
|
|
int rc;
|
|
|
|
/* Some devices have extra OF data and an OF-style MODALIAS */
|
|
rc = of_device_uevent_modalias(dev, env);
|
|
if (rc != -ENODEV)
|
|
return rc;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static struct attribute *mdio_bus_device_statistics_attrs[] = {
|
|
&dev_attr_mdio_bus_device_transfers.attr.attr,
|
|
&dev_attr_mdio_bus_device_errors.attr.attr,
|
|
&dev_attr_mdio_bus_device_writes.attr.attr,
|
|
&dev_attr_mdio_bus_device_reads.attr.attr,
|
|
NULL,
|
|
};
|
|
|
|
static const struct attribute_group mdio_bus_device_statistics_group = {
|
|
.name = "statistics",
|
|
.attrs = mdio_bus_device_statistics_attrs,
|
|
};
|
|
|
|
static const struct attribute_group *mdio_bus_dev_groups[] = {
|
|
&mdio_bus_device_statistics_group,
|
|
NULL,
|
|
};
|
|
|
|
struct bus_type mdio_bus_type = {
|
|
.name = "mdio_bus",
|
|
.dev_groups = mdio_bus_dev_groups,
|
|
.match = mdio_bus_match,
|
|
.uevent = mdio_uevent,
|
|
};
|
|
EXPORT_SYMBOL(mdio_bus_type);
|
|
|
|
int __init mdio_bus_init(void)
|
|
{
|
|
int ret;
|
|
|
|
ret = class_register(&mdio_bus_class);
|
|
if (!ret) {
|
|
ret = bus_register(&mdio_bus_type);
|
|
if (ret)
|
|
class_unregister(&mdio_bus_class);
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
EXPORT_SYMBOL_GPL(mdio_bus_init);
|
|
|
|
#if IS_ENABLED(CONFIG_PHYLIB)
|
|
void mdio_bus_exit(void)
|
|
{
|
|
class_unregister(&mdio_bus_class);
|
|
bus_unregister(&mdio_bus_type);
|
|
}
|
|
EXPORT_SYMBOL_GPL(mdio_bus_exit);
|
|
#else
|
|
module_init(mdio_bus_init);
|
|
/* no module_exit, intentional */
|
|
MODULE_LICENSE("GPL");
|
|
MODULE_DESCRIPTION("MDIO bus/device layer");
|
|
#endif
|