| // 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 = 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 |