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- // SPDX-License-Identifier: GPL-2.0+
- /* MDIO Bus interface
- *
- * Author: Andy Fleming
- *
- * Copyright (c) 2004 Freescale Semiconductor, Inc.
- */
- #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
- #include <linux/delay.h>
- #include <linux/device.h>
- #include <linux/errno.h>
- #include <linux/etherdevice.h>
- #include <linux/ethtool.h>
- #include <linux/gpio.h>
- #include <linux/gpio/consumer.h>
- #include <linux/init.h>
- #include <linux/interrupt.h>
- #include <linux/io.h>
- #include <linux/kernel.h>
- #include <linux/mii.h>
- #include <linux/mm.h>
- #include <linux/module.h>
- #include <linux/netdevice.h>
- #include <linux/of_device.h>
- #include <linux/of_gpio.h>
- #include <linux/of_mdio.h>
- #include <linux/phy.h>
- #include <linux/reset.h>
- #include <linux/skbuff.h>
- #include <linux/slab.h>
- #include <linux/spinlock.h>
- #include <linux/string.h>
- #include <linux/uaccess.h>
- #include <linux/unistd.h>
- #define CREATE_TRACE_POINTS
- #include <trace/events/mdio.h>
- #include "mdio-boardinfo.h"
- static int mdiobus_register_gpiod(struct mdio_device *mdiodev)
- {
- /* Deassert the optional reset signal */
- mdiodev->reset_gpio = gpiod_get_optional(&mdiodev->dev,
- "reset", GPIOD_OUT_LOW);
- if (IS_ERR(mdiodev->reset_gpio))
- return PTR_ERR(mdiodev->reset_gpio);
- if (mdiodev->reset_gpio)
- gpiod_set_consumer_name(mdiodev->reset_gpio, "PHY reset");
- return 0;
- }
- static int mdiobus_register_reset(struct mdio_device *mdiodev)
- {
- struct reset_control *reset;
- reset = reset_control_get_optional_exclusive(&mdiodev->dev, "phy");
- if (IS_ERR(reset))
- return PTR_ERR(reset);
- mdiodev->reset_ctrl = reset;
- return 0;
- }
- int mdiobus_register_device(struct mdio_device *mdiodev)
- {
- int err;
- if (mdiodev->bus->mdio_map[mdiodev->addr])
- return -EBUSY;
- if (mdiodev->flags & MDIO_DEVICE_FLAG_PHY) {
- err = mdiobus_register_gpiod(mdiodev);
- if (err)
- return err;
- err = mdiobus_register_reset(mdiodev);
- if (err)
- return err;
- /* Assert the reset signal */
- mdio_device_reset(mdiodev, 1);
- }
- mdiodev->bus->mdio_map[mdiodev->addr] = mdiodev;
- return 0;
- }
- EXPORT_SYMBOL(mdiobus_register_device);
- int mdiobus_unregister_device(struct mdio_device *mdiodev)
- {
- if (mdiodev->bus->mdio_map[mdiodev->addr] != mdiodev)
- return -EINVAL;
- reset_control_put(mdiodev->reset_ctrl);
- mdiodev->bus->mdio_map[mdiodev->addr] = NULL;
- return 0;
- }
- EXPORT_SYMBOL(mdiobus_unregister_device);
- struct phy_device *mdiobus_get_phy(struct mii_bus *bus, int addr)
- {
- struct mdio_device *mdiodev;
- if (addr < 0 || addr >= ARRAY_SIZE(bus->mdio_map))
- return NULL;
- mdiodev = bus->mdio_map[addr];
- if (!mdiodev)
- return NULL;
- if (!(mdiodev->flags & MDIO_DEVICE_FLAG_PHY))
- return NULL;
- return container_of(mdiodev, struct phy_device, mdio);
- }
- EXPORT_SYMBOL(mdiobus_get_phy);
- bool mdiobus_is_registered_device(struct mii_bus *bus, int addr)
- {
- return bus->mdio_map[addr];
- }
- EXPORT_SYMBOL(mdiobus_is_registered_device);
- /**
- * mdiobus_alloc_size - allocate a mii_bus structure
- * @size: extra amount of memory to allocate for private storage.
- * If non-zero, then bus->priv is points to that memory.
- *
- * Description: called by a bus driver to allocate an mii_bus
- * structure to fill in.
- */
- struct mii_bus *mdiobus_alloc_size(size_t size)
- {
- struct mii_bus *bus;
- size_t aligned_size = ALIGN(sizeof(*bus), NETDEV_ALIGN);
- size_t alloc_size;
- int i;
- /* If we alloc extra space, it should be aligned */
- if (size)
- alloc_size = aligned_size + size;
- else
- alloc_size = sizeof(*bus);
- bus = kzalloc(alloc_size, GFP_KERNEL);
- if (!bus)
- return NULL;
- bus->state = MDIOBUS_ALLOCATED;
- if (size)
- bus->priv = (void *)bus + aligned_size;
- /* Initialise the interrupts to polling and 64-bit seqcounts */
- for (i = 0; i < PHY_MAX_ADDR; i++) {
- bus->irq[i] = PHY_POLL;
- u64_stats_init(&bus->stats[i].syncp);
- }
- return bus;
- }
- EXPORT_SYMBOL(mdiobus_alloc_size);
- /**
- * mdiobus_release - mii_bus device release callback
- * @d: the target struct device that contains the mii_bus
- *
- * Description: called when the last reference to an mii_bus is
- * dropped, to free the underlying memory.
- */
- static void mdiobus_release(struct device *d)
- {
- struct mii_bus *bus = to_mii_bus(d);
- WARN(bus->state != MDIOBUS_RELEASED &&
- /* for compatibility with error handling in drivers */
- bus->state != MDIOBUS_ALLOCATED,
- "%s: not in RELEASED or ALLOCATED state\n",
- bus->id);
- kfree(bus);
- }
- struct mdio_bus_stat_attr {
- int addr;
- unsigned int field_offset;
- };
- static u64 mdio_bus_get_stat(struct mdio_bus_stats *s, unsigned int offset)
- {
- const char *p = (const char *)s + offset;
- unsigned int start;
- u64 val = 0;
- do {
- start = u64_stats_fetch_begin(&s->syncp);
- val = u64_stats_read((const u64_stats_t *)p);
- } while (u64_stats_fetch_retry(&s->syncp, start));
- return val;
- }
- static u64 mdio_bus_get_global_stat(struct mii_bus *bus, unsigned int offset)
- {
- unsigned int i;
- u64 val = 0;
- for (i = 0; i < PHY_MAX_ADDR; i++)
- val += mdio_bus_get_stat(&bus->stats[i], offset);
- return val;
- }
- static ssize_t mdio_bus_stat_field_show(struct device *dev,
- struct device_attribute *attr,
- char *buf)
- {
- struct mii_bus *bus = to_mii_bus(dev);
- struct mdio_bus_stat_attr *sattr;
- struct dev_ext_attribute *eattr;
- u64 val;
- eattr = container_of(attr, struct dev_ext_attribute, attr);
- sattr = eattr->var;
- if (sattr->addr < 0)
- val = mdio_bus_get_global_stat(bus, sattr->field_offset);
- else
- val = mdio_bus_get_stat(&bus->stats[sattr->addr],
- sattr->field_offset);
- return sysfs_emit(buf, "%llu\n", val);
- }
- static ssize_t mdio_bus_device_stat_field_show(struct device *dev,
- struct device_attribute *attr,
- char *buf)
- {
- struct mdio_device *mdiodev = to_mdio_device(dev);
- struct mii_bus *bus = mdiodev->bus;
- struct mdio_bus_stat_attr *sattr;
- struct dev_ext_attribute *eattr;
- int addr = mdiodev->addr;
- u64 val;
- eattr = container_of(attr, struct dev_ext_attribute, attr);
- sattr = eattr->var;
- val = mdio_bus_get_stat(&bus->stats[addr], sattr->field_offset);
- return sysfs_emit(buf, "%llu\n", val);
- }
- #define MDIO_BUS_STATS_ATTR_DECL(field, file) \
- static struct dev_ext_attribute dev_attr_mdio_bus_##field = { \
- .attr = { .attr = { .name = file, .mode = 0444 }, \
- .show = mdio_bus_stat_field_show, \
- }, \
- .var = &((struct mdio_bus_stat_attr) { \
- -1, offsetof(struct mdio_bus_stats, field) \
- }), \
- }; \
- static struct dev_ext_attribute dev_attr_mdio_bus_device_##field = { \
- .attr = { .attr = { .name = file, .mode = 0444 }, \
- .show = mdio_bus_device_stat_field_show, \
- }, \
- .var = &((struct mdio_bus_stat_attr) { \
- -1, offsetof(struct mdio_bus_stats, field) \
- }), \
- };
- #define MDIO_BUS_STATS_ATTR(field) \
- MDIO_BUS_STATS_ATTR_DECL(field, __stringify(field))
- MDIO_BUS_STATS_ATTR(transfers);
- MDIO_BUS_STATS_ATTR(errors);
- MDIO_BUS_STATS_ATTR(writes);
- MDIO_BUS_STATS_ATTR(reads);
- #define MDIO_BUS_STATS_ADDR_ATTR_DECL(field, addr, file) \
- static struct dev_ext_attribute dev_attr_mdio_bus_addr_##field##_##addr = { \
- .attr = { .attr = { .name = file, .mode = 0444 }, \
- .show = mdio_bus_stat_field_show, \
- }, \
- .var = &((struct mdio_bus_stat_attr) { \
- addr, offsetof(struct mdio_bus_stats, field) \
- }), \
- }
- #define MDIO_BUS_STATS_ADDR_ATTR(field, addr) \
- MDIO_BUS_STATS_ADDR_ATTR_DECL(field, addr, \
- __stringify(field) "_" __stringify(addr))
- #define MDIO_BUS_STATS_ADDR_ATTR_GROUP_DECL(addr) \
- MDIO_BUS_STATS_ADDR_ATTR(transfers, addr); \
- MDIO_BUS_STATS_ADDR_ATTR(errors, addr); \
- MDIO_BUS_STATS_ADDR_ATTR(writes, addr); \
- MDIO_BUS_STATS_ADDR_ATTR(reads, addr) \
- MDIO_BUS_STATS_ADDR_ATTR_GROUP_DECL(0);
- MDIO_BUS_STATS_ADDR_ATTR_GROUP_DECL(1);
- MDIO_BUS_STATS_ADDR_ATTR_GROUP_DECL(2);
- MDIO_BUS_STATS_ADDR_ATTR_GROUP_DECL(3);
- MDIO_BUS_STATS_ADDR_ATTR_GROUP_DECL(4);
- MDIO_BUS_STATS_ADDR_ATTR_GROUP_DECL(5);
- MDIO_BUS_STATS_ADDR_ATTR_GROUP_DECL(6);
- MDIO_BUS_STATS_ADDR_ATTR_GROUP_DECL(7);
- MDIO_BUS_STATS_ADDR_ATTR_GROUP_DECL(8);
- MDIO_BUS_STATS_ADDR_ATTR_GROUP_DECL(9);
- MDIO_BUS_STATS_ADDR_ATTR_GROUP_DECL(10);
- MDIO_BUS_STATS_ADDR_ATTR_GROUP_DECL(11);
- MDIO_BUS_STATS_ADDR_ATTR_GROUP_DECL(12);
- MDIO_BUS_STATS_ADDR_ATTR_GROUP_DECL(13);
- MDIO_BUS_STATS_ADDR_ATTR_GROUP_DECL(14);
- MDIO_BUS_STATS_ADDR_ATTR_GROUP_DECL(15);
- MDIO_BUS_STATS_ADDR_ATTR_GROUP_DECL(16);
- MDIO_BUS_STATS_ADDR_ATTR_GROUP_DECL(17);
- MDIO_BUS_STATS_ADDR_ATTR_GROUP_DECL(18);
- MDIO_BUS_STATS_ADDR_ATTR_GROUP_DECL(19);
- MDIO_BUS_STATS_ADDR_ATTR_GROUP_DECL(20);
- MDIO_BUS_STATS_ADDR_ATTR_GROUP_DECL(21);
- MDIO_BUS_STATS_ADDR_ATTR_GROUP_DECL(22);
- MDIO_BUS_STATS_ADDR_ATTR_GROUP_DECL(23);
- MDIO_BUS_STATS_ADDR_ATTR_GROUP_DECL(24);
- MDIO_BUS_STATS_ADDR_ATTR_GROUP_DECL(25);
- MDIO_BUS_STATS_ADDR_ATTR_GROUP_DECL(26);
- MDIO_BUS_STATS_ADDR_ATTR_GROUP_DECL(27);
- MDIO_BUS_STATS_ADDR_ATTR_GROUP_DECL(28);
- MDIO_BUS_STATS_ADDR_ATTR_GROUP_DECL(29);
- MDIO_BUS_STATS_ADDR_ATTR_GROUP_DECL(30);
- MDIO_BUS_STATS_ADDR_ATTR_GROUP_DECL(31);
- #define MDIO_BUS_STATS_ADDR_ATTR_GROUP(addr) \
- &dev_attr_mdio_bus_addr_transfers_##addr.attr.attr, \
- &dev_attr_mdio_bus_addr_errors_##addr.attr.attr, \
- &dev_attr_mdio_bus_addr_writes_##addr.attr.attr, \
- &dev_attr_mdio_bus_addr_reads_##addr.attr.attr \
- static struct attribute *mdio_bus_statistics_attrs[] = {
- &dev_attr_mdio_bus_transfers.attr.attr,
- &dev_attr_mdio_bus_errors.attr.attr,
- &dev_attr_mdio_bus_writes.attr.attr,
- &dev_attr_mdio_bus_reads.attr.attr,
- MDIO_BUS_STATS_ADDR_ATTR_GROUP(0),
- MDIO_BUS_STATS_ADDR_ATTR_GROUP(1),
- MDIO_BUS_STATS_ADDR_ATTR_GROUP(2),
- MDIO_BUS_STATS_ADDR_ATTR_GROUP(3),
- MDIO_BUS_STATS_ADDR_ATTR_GROUP(4),
- MDIO_BUS_STATS_ADDR_ATTR_GROUP(5),
- MDIO_BUS_STATS_ADDR_ATTR_GROUP(6),
- MDIO_BUS_STATS_ADDR_ATTR_GROUP(7),
- MDIO_BUS_STATS_ADDR_ATTR_GROUP(8),
- MDIO_BUS_STATS_ADDR_ATTR_GROUP(9),
- MDIO_BUS_STATS_ADDR_ATTR_GROUP(10),
- MDIO_BUS_STATS_ADDR_ATTR_GROUP(11),
- MDIO_BUS_STATS_ADDR_ATTR_GROUP(12),
- MDIO_BUS_STATS_ADDR_ATTR_GROUP(13),
- MDIO_BUS_STATS_ADDR_ATTR_GROUP(14),
- MDIO_BUS_STATS_ADDR_ATTR_GROUP(15),
- MDIO_BUS_STATS_ADDR_ATTR_GROUP(16),
- MDIO_BUS_STATS_ADDR_ATTR_GROUP(17),
- MDIO_BUS_STATS_ADDR_ATTR_GROUP(18),
- MDIO_BUS_STATS_ADDR_ATTR_GROUP(19),
- MDIO_BUS_STATS_ADDR_ATTR_GROUP(20),
- MDIO_BUS_STATS_ADDR_ATTR_GROUP(21),
- MDIO_BUS_STATS_ADDR_ATTR_GROUP(22),
- MDIO_BUS_STATS_ADDR_ATTR_GROUP(23),
- MDIO_BUS_STATS_ADDR_ATTR_GROUP(24),
- MDIO_BUS_STATS_ADDR_ATTR_GROUP(25),
- MDIO_BUS_STATS_ADDR_ATTR_GROUP(26),
- MDIO_BUS_STATS_ADDR_ATTR_GROUP(27),
- MDIO_BUS_STATS_ADDR_ATTR_GROUP(28),
- MDIO_BUS_STATS_ADDR_ATTR_GROUP(29),
- MDIO_BUS_STATS_ADDR_ATTR_GROUP(30),
- MDIO_BUS_STATS_ADDR_ATTR_GROUP(31),
- NULL,
- };
- static const struct attribute_group mdio_bus_statistics_group = {
- .name = "statistics",
- .attrs = mdio_bus_statistics_attrs,
- };
- static const struct attribute_group *mdio_bus_groups[] = {
- &mdio_bus_statistics_group,
- NULL,
- };
- static struct class mdio_bus_class = {
- .name = "mdio_bus",
- .dev_release = mdiobus_release,
- .dev_groups = mdio_bus_groups,
- };
- /**
- * mdio_find_bus - Given the name of a mdiobus, find the mii_bus.
- * @mdio_name: The name of a mdiobus.
- *
- * Returns a reference to the mii_bus, or NULL if none found. The
- * embedded struct device will have its reference count incremented,
- * and this must be put_deviced'ed once the bus is finished with.
- */
- struct mii_bus *mdio_find_bus(const char *mdio_name)
- {
- struct device *d;
- d = class_find_device_by_name(&mdio_bus_class, mdio_name);
- return d ? to_mii_bus(d) : NULL;
- }
- EXPORT_SYMBOL(mdio_find_bus);
- #if IS_ENABLED(CONFIG_OF_MDIO)
- /**
- * of_mdio_find_bus - Given an mii_bus node, find the mii_bus.
- * @mdio_bus_np: Pointer to the mii_bus.
- *
- * Returns a reference to the mii_bus, or NULL if none found. The
- * embedded struct device will have its reference count incremented,
- * and this must be put once the bus is finished with.
- *
- * Because the association of a device_node and mii_bus is made via
- * of_mdiobus_register(), the mii_bus cannot be found before it is
- * registered with of_mdiobus_register().
- *
- */
- struct mii_bus *of_mdio_find_bus(struct device_node *mdio_bus_np)
- {
- struct device *d;
- if (!mdio_bus_np)
- return NULL;
- d = class_find_device_by_of_node(&mdio_bus_class, mdio_bus_np);
- return d ? to_mii_bus(d) : NULL;
- }
- EXPORT_SYMBOL(of_mdio_find_bus);
- /* Walk the list of subnodes of a mdio bus and look for a node that
- * matches the mdio device's address with its 'reg' property. If
- * found, set the of_node pointer for the mdio device. This allows
- * auto-probed phy devices to be supplied with information passed in
- * via DT.
- */
- static void of_mdiobus_link_mdiodev(struct mii_bus *bus,
- struct mdio_device *mdiodev)
- {
- struct device *dev = &mdiodev->dev;
- struct device_node *child;
- if (dev->of_node || !bus->dev.of_node)
- return;
- for_each_available_child_of_node(bus->dev.of_node, child) {
- int addr;
- addr = of_mdio_parse_addr(dev, child);
- if (addr < 0)
- continue;
- if (addr == mdiodev->addr) {
- device_set_node(dev, of_fwnode_handle(child));
- /* The refcount on "child" is passed to the mdio
- * device. Do _not_ use of_node_put(child) here.
- */
- 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 - 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 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;
- if (bus->parent && bus->parent->of_node)
- bus->parent->of_node->fwnode.flags |=
- FWNODE_FLAG_NEEDS_CHILD_BOUND_ON_ADD;
- WARN(bus->state != MDIOBUS_ALLOCATED &&
- bus->state != MDIOBUS_UNREGISTERED,
- "%s: not in ALLOCATED or UNREGISTERED state\n", bus->id);
- 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);
- /* We need to set state to MDIOBUS_UNREGISTERED to correctly release
- * the device in mdiobus_free()
- *
- * State will be updated later in this function in case of success
- */
- bus->state = MDIOBUS_UNREGISTERED;
- 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);
- /* assert bus level PHY GPIO reset */
- gpiod = devm_gpiod_get_optional(&bus->dev, "reset", GPIOD_OUT_HIGH);
- if (IS_ERR(gpiod)) {
- err = dev_err_probe(&bus->dev, PTR_ERR(gpiod),
- "mii_bus %s couldn't get reset GPIO\n",
- bus->id);
- device_del(&bus->dev);
- return err;
- } else if (gpiod) {
- bus->reset_gpiod = gpiod;
- 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 & BIT(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;
- dev_dbg(&bus->dev, "probed\n");
- 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;
- if (WARN_ON_ONCE(bus->state != MDIOBUS_REGISTERED))
- return;
- 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;
- }
- WARN(bus->state != MDIOBUS_UNREGISTERED,
- "%s: not in UNREGISTERED state\n", bus->id);
- 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;
- lockdep_assert_held_once(&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;
- lockdep_assert_held_once(&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;
- 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;
- 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;
- 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;
- 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;
- 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);
- /**
- * mdiobus_modify_changed - Convenience function for modifying a given mdio
- * device register and returning if it changed
- * @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_changed(struct mii_bus *bus, int addr, u32 regnum,
- u16 mask, u16 set)
- {
- int err;
- mutex_lock(&bus->mdio_lock);
- err = __mdiobus_modify_changed(bus, addr, regnum, mask, set);
- mutex_unlock(&bus->mdio_lock);
- return err;
- }
- EXPORT_SYMBOL_GPL(mdiobus_modify_changed);
- /**
- * 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_driver *mdiodrv = to_mdio_driver(drv);
- struct mdio_device *mdio = to_mdio_device(dev);
- /* Both the driver and device must type-match */
- if (!(mdiodrv->mdiodrv.flags & MDIO_DEVICE_IS_PHY) !=
- !(mdio->flags & MDIO_DEVICE_FLAG_PHY))
- return 0;
- 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;
- }
- #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
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