config FSL_ENETC_MDIO
tristate "ENETC MDIO driver"
- depends on PCI && MDIO_BUS
- select MDIO_DEVRES
+ depends on PCI && PHYLIB
help
This driver supports NXP ENETC Central MDIO controller as a PCIe
physical function (PF) device.
reflects whether the mdio_bus/mdio_device code is built as a
loadable module or built-in.
+if PHYLIB
+
config FWNODE_MDIO
- def_tristate PHYLIB
- depends on (ACPI || OF) || COMPILE_TEST
+ def_tristate (ACPI || OF) || COMPILE_TEST
select FIXED_PHY
help
FWNODE MDIO bus (Ethernet PHY) accessors
config OF_MDIO
- def_tristate PHYLIB
- depends on OF
- depends on PHYLIB
+ def_tristate OF
select FIXED_PHY
help
OpenFirmware MDIO bus (Ethernet PHY) accessors
config ACPI_MDIO
- def_tristate PHYLIB
- depends on ACPI
- depends on PHYLIB
+ def_tristate ACPI
help
ACPI MDIO bus (Ethernet PHY) accessors
-if MDIO_BUS
-
config MDIO_DEVRES
tristate
config MDIO_XGENE
tristate "APM X-Gene SoC MDIO bus controller"
depends on ARCH_XGENE || COMPILE_TEST
- depends on PHYLIB
help
This module provides a driver for the MDIO busses found in the
APM X-Gene SoC's.
libphy-y := phy.o phy-c45.o phy-core.o phy_device.o \
linkmode.o phy_link_topology.o \
- phy_package.o phy_caps.o
+ phy_package.o phy_caps.o mdio_bus_provider.o
mdio-bus-y += mdio_bus.o mdio_device.o
ifdef CONFIG_MDIO_DEVICE
#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/consumer.h>
#include <linux/init.h>
-#include <linux/interrupt.h>
#include <linux/io.h>
#include <linux/kernel.h>
-#include <linux/micrel_phy.h>
#include <linux/mii.h>
#include <linux/mm.h>
#include <linux/module.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>
#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 */
}
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
NULL,
};
-static struct class mdio_bus_class = {
+const struct class mdio_bus_class = {
.name = "mdio_bus",
.dev_release = mdiobus_release,
.dev_groups = mdio_bus_groups,
};
+EXPORT_SYMBOL_GPL(mdio_bus_class);
/**
* mdio_find_bus - Given the name of a mdiobus, find the mii_bus.
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.
- * If a PHY package is found, PHY is searched also there.
- */
-static int of_mdiobus_find_phy(struct device *dev, struct mdio_device *mdiodev,
- struct device_node *np)
-{
- struct device_node *child;
-
- for_each_available_child_of_node(np, child) {
- int addr;
-
- if (of_node_name_eq(child, "ethernet-phy-package")) {
- /* Validate PHY package reg presence */
- if (!of_property_present(child, "reg")) {
- of_node_put(child);
- return -EINVAL;
- }
-
- if (!of_mdiobus_find_phy(dev, mdiodev, child)) {
- /* The refcount for the PHY package will be
- * incremented later when PHY join the Package.
- */
- of_node_put(child);
- return 0;
- }
-
- continue;
- }
-
- 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 0;
- }
- }
-
- return -ENODEV;
-}
-
-static void of_mdiobus_link_mdiodev(struct mii_bus *bus,
- struct mdio_device *mdiodev)
-{
- struct device *dev = &mdiodev->dev;
-
- if (dev->of_node || !bus->dev.of_node)
- return;
-
- of_mdiobus_find_phy(dev, mdiodev, bus->dev.of_node);
-}
-#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;
-
- strscpy(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;
-}
-
-static struct phy_device *mdiobus_scan(struct mii_bus *bus, int addr, bool c45)
-{
- struct phy_device *phydev = ERR_PTR(-ENODEV);
- struct fwnode_handle *fwnode;
- char node_name[16];
- int err;
-
- phydev = get_phy_device(bus, addr, c45);
- if (IS_ERR(phydev))
- return phydev;
-
- /* For DT, see if the auto-probed phy has a corresponding child
- * in the bus node, and set the of_node pointer in this case.
- */
- of_mdiobus_link_mdiodev(bus, &phydev->mdio);
-
- /* Search for a swnode for the phy in the swnode hierarchy of the bus.
- * If there is no swnode for the phy provided, just ignore it.
- */
- if (dev_fwnode(&bus->dev) && !dev_fwnode(&phydev->mdio.dev)) {
- snprintf(node_name, sizeof(node_name), "ethernet-phy@%d",
- addr);
- fwnode = fwnode_get_named_child_node(dev_fwnode(&bus->dev),
- node_name);
- if (fwnode)
- device_set_node(&phydev->mdio.dev, fwnode);
- }
-
- err = phy_device_register(phydev);
- if (err) {
- phy_device_free(phydev);
- return ERR_PTR(-ENODEV);
- }
-
- return phydev;
-}
-
-/**
- * mdiobus_scan_c22 - scan one address on a bus for C22 MDIO devices.
- * @bus: mii_bus to scan
- * @addr: address on bus to scan
- *
- * This function scans one address on 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_c22(struct mii_bus *bus, int addr)
-{
- return mdiobus_scan(bus, addr, false);
-}
-EXPORT_SYMBOL(mdiobus_scan_c22);
-
-/**
- * mdiobus_scan_c45 - scan one address on a bus for C45 MDIO devices.
- * @bus: mii_bus to scan
- * @addr: address on bus to scan
- *
- * This function scans one address on 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.
- */
-static struct phy_device *mdiobus_scan_c45(struct mii_bus *bus, int addr)
-{
- return mdiobus_scan(bus, addr, true);
-}
-
-static int mdiobus_scan_bus_c22(struct mii_bus *bus)
-{
- int i;
-
- for (i = 0; i < PHY_MAX_ADDR; i++) {
- if ((bus->phy_mask & BIT(i)) == 0) {
- struct phy_device *phydev;
-
- phydev = mdiobus_scan_c22(bus, i);
- if (IS_ERR(phydev) && (PTR_ERR(phydev) != -ENODEV))
- return PTR_ERR(phydev);
- }
- }
- return 0;
-}
-
-static int mdiobus_scan_bus_c45(struct mii_bus *bus)
-{
- int i;
-
- for (i = 0; i < PHY_MAX_ADDR; i++) {
- if ((bus->phy_mask & BIT(i)) == 0) {
- struct phy_device *phydev;
-
- /* Don't scan C45 if we already have a C22 device */
- if (bus->mdio_map[i])
- continue;
-
- phydev = mdiobus_scan_c45(bus, i);
- if (IS_ERR(phydev) && (PTR_ERR(phydev) != -ENODEV))
- return PTR_ERR(phydev);
- }
- }
- return 0;
-}
-
-/* There are some C22 PHYs which do bad things when where is a C45
- * transaction on the bus, like accepting a read themselves, and
- * stomping over the true devices reply, to performing a write to
- * themselves which was intended for another device. Now that C22
- * devices have been found, see if any of them are bad for C45, and if we
- * should skip the C45 scan.
- */
-static bool mdiobus_prevent_c45_scan(struct mii_bus *bus)
-{
- int i;
-
- for (i = 0; i < PHY_MAX_ADDR; i++) {
- struct phy_device *phydev;
- u32 oui;
-
- phydev = mdiobus_get_phy(bus, i);
- if (!phydev)
- continue;
- oui = phydev->phy_id >> 10;
-
- if (oui == MICREL_OUI)
- return true;
- }
- return false;
-}
-
-/**
- * __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;
- struct gpio_desc *gpiod;
- bool prevent_c45_scan;
- int i, err;
-
- if (!bus || !bus->name)
- return -EINVAL;
-
- /* An access method always needs both read and write operations */
- if (!!bus->read != !!bus->write || !!bus->read_c45 != !!bus->write_c45)
- return -EINVAL;
-
- /* At least one method is mandatory */
- if (!bus->read && !bus->read_c45)
- 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);
-
- /* If the bus state is allocated, we're registering a fresh bus
- * that may have a fwnode associated with it. Grab a reference
- * to the fwnode. This will be dropped when the bus is released.
- * If the bus was set to unregistered, it means that the bus was
- * previously registered, and we've already grabbed a reference.
- */
- if (bus->state == MDIOBUS_ALLOCATED)
- fwnode_handle_get(dev_fwnode(&bus->dev));
-
- /* 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;
- }
-
- if (bus->read) {
- err = mdiobus_scan_bus_c22(bus);
- if (err)
- goto error;
- }
-
- prevent_c45_scan = mdiobus_prevent_c45_scan(bus);
-
- if (!prevent_c45_scan && bus->read_c45) {
- err = mdiobus_scan_bus_c45(bus);
- if (err)
- 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:
- for (i = 0; i < PHY_MAX_ADDR; i++) {
- 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);
-
static void mdiobus_stats_acct(struct mdio_bus_stats *stats, bool op, int ret)
{
preempt_disable();
--- /dev/null
+// SPDX-License-Identifier: GPL-2.0+
+/* MDIO Bus provider 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/consumer.h>
+#include <linux/init.h>
+#include <linux/io.h>
+#include <linux/kernel.h>
+#include <linux/micrel_phy.h>
+#include <linux/mii.h>
+#include <linux/mm.h>
+#include <linux/netdevice.h>
+#include <linux/of_device.h>
+#include <linux/of_mdio.h>
+#include <linux/phy.h>
+#include <linux/slab.h>
+#include <linux/string.h>
+#include <linux/uaccess.h>
+#include <linux/unistd.h>
+
+#include "mdio-boardinfo.h"
+
+/**
+ * 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);
+
+#if IS_ENABLED(CONFIG_OF_MDIO)
+/* 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.
+ * If a PHY package is found, PHY is searched also there.
+ */
+static int of_mdiobus_find_phy(struct device *dev, struct mdio_device *mdiodev,
+ struct device_node *np)
+{
+ struct device_node *child;
+
+ for_each_available_child_of_node(np, child) {
+ int addr;
+
+ if (of_node_name_eq(child, "ethernet-phy-package")) {
+ /* Validate PHY package reg presence */
+ if (!of_property_present(child, "reg")) {
+ of_node_put(child);
+ return -EINVAL;
+ }
+
+ if (!of_mdiobus_find_phy(dev, mdiodev, child)) {
+ /* The refcount for the PHY package will be
+ * incremented later when PHY join the Package.
+ */
+ of_node_put(child);
+ return 0;
+ }
+
+ continue;
+ }
+
+ 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 0;
+ }
+ }
+
+ return -ENODEV;
+}
+
+static void of_mdiobus_link_mdiodev(struct mii_bus *bus,
+ struct mdio_device *mdiodev)
+{
+ struct device *dev = &mdiodev->dev;
+
+ if (dev->of_node || !bus->dev.of_node)
+ return;
+
+ of_mdiobus_find_phy(dev, mdiodev, bus->dev.of_node);
+}
+#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;
+
+ strscpy(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;
+}
+
+static struct phy_device *mdiobus_scan(struct mii_bus *bus, int addr, bool c45)
+{
+ struct phy_device *phydev = ERR_PTR(-ENODEV);
+ struct fwnode_handle *fwnode;
+ char node_name[16];
+ int err;
+
+ phydev = get_phy_device(bus, addr, c45);
+ if (IS_ERR(phydev))
+ return phydev;
+
+#if IS_ENABLED(CONFIG_OF_MDIO)
+ /* For DT, see if the auto-probed phy has a corresponding child
+ * in the bus node, and set the of_node pointer in this case.
+ */
+ of_mdiobus_link_mdiodev(bus, &phydev->mdio);
+#endif
+
+ /* Search for a swnode for the phy in the swnode hierarchy of the bus.
+ * If there is no swnode for the phy provided, just ignore it.
+ */
+ if (dev_fwnode(&bus->dev) && !dev_fwnode(&phydev->mdio.dev)) {
+ snprintf(node_name, sizeof(node_name), "ethernet-phy@%d",
+ addr);
+ fwnode = fwnode_get_named_child_node(dev_fwnode(&bus->dev),
+ node_name);
+ if (fwnode)
+ device_set_node(&phydev->mdio.dev, fwnode);
+ }
+
+ err = phy_device_register(phydev);
+ if (err) {
+ phy_device_free(phydev);
+ return ERR_PTR(-ENODEV);
+ }
+
+ return phydev;
+}
+
+/**
+ * mdiobus_scan_c22 - scan one address on a bus for C22 MDIO devices.
+ * @bus: mii_bus to scan
+ * @addr: address on bus to scan
+ *
+ * This function scans one address on 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_c22(struct mii_bus *bus, int addr)
+{
+ return mdiobus_scan(bus, addr, false);
+}
+EXPORT_SYMBOL(mdiobus_scan_c22);
+
+/**
+ * mdiobus_scan_c45 - scan one address on a bus for C45 MDIO devices.
+ * @bus: mii_bus to scan
+ * @addr: address on bus to scan
+ *
+ * This function scans one address on 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.
+ */
+static struct phy_device *mdiobus_scan_c45(struct mii_bus *bus, int addr)
+{
+ return mdiobus_scan(bus, addr, true);
+}
+
+static int mdiobus_scan_bus_c22(struct mii_bus *bus)
+{
+ int i;
+
+ for (i = 0; i < PHY_MAX_ADDR; i++) {
+ if ((bus->phy_mask & BIT(i)) == 0) {
+ struct phy_device *phydev;
+
+ phydev = mdiobus_scan_c22(bus, i);
+ if (IS_ERR(phydev) && (PTR_ERR(phydev) != -ENODEV))
+ return PTR_ERR(phydev);
+ }
+ }
+ return 0;
+}
+
+static int mdiobus_scan_bus_c45(struct mii_bus *bus)
+{
+ int i;
+
+ for (i = 0; i < PHY_MAX_ADDR; i++) {
+ if ((bus->phy_mask & BIT(i)) == 0) {
+ struct phy_device *phydev;
+
+ /* Don't scan C45 if we already have a C22 device */
+ if (bus->mdio_map[i])
+ continue;
+
+ phydev = mdiobus_scan_c45(bus, i);
+ if (IS_ERR(phydev) && (PTR_ERR(phydev) != -ENODEV))
+ return PTR_ERR(phydev);
+ }
+ }
+ return 0;
+}
+
+/* There are some C22 PHYs which do bad things when where is a C45
+ * transaction on the bus, like accepting a read themselves, and
+ * stomping over the true devices reply, to performing a write to
+ * themselves which was intended for another device. Now that C22
+ * devices have been found, see if any of them are bad for C45, and if we
+ * should skip the C45 scan.
+ */
+static bool mdiobus_prevent_c45_scan(struct mii_bus *bus)
+{
+ int i;
+
+ for (i = 0; i < PHY_MAX_ADDR; i++) {
+ struct phy_device *phydev;
+ u32 oui;
+
+ phydev = mdiobus_get_phy(bus, i);
+ if (!phydev)
+ continue;
+ oui = phydev->phy_id >> 10;
+
+ if (oui == MICREL_OUI)
+ return true;
+ }
+ return false;
+}
+
+/**
+ * __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;
+ struct gpio_desc *gpiod;
+ bool prevent_c45_scan;
+ int i, err;
+
+ if (!bus || !bus->name)
+ return -EINVAL;
+
+ /* An access method always needs both read and write operations */
+ if (!!bus->read != !!bus->write || !!bus->read_c45 != !!bus->write_c45)
+ return -EINVAL;
+
+ /* At least one method is mandatory */
+ if (!bus->read && !bus->read_c45)
+ 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);
+
+ /* If the bus state is allocated, we're registering a fresh bus
+ * that may have a fwnode associated with it. Grab a reference
+ * to the fwnode. This will be dropped when the bus is released.
+ * If the bus was set to unregistered, it means that the bus was
+ * previously registered, and we've already grabbed a reference.
+ */
+ if (bus->state == MDIOBUS_ALLOCATED)
+ fwnode_handle_get(dev_fwnode(&bus->dev));
+
+ /* 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;
+ }
+
+ if (bus->read) {
+ err = mdiobus_scan_bus_c22(bus);
+ if (err)
+ goto error;
+ }
+
+ prevent_c45_scan = mdiobus_prevent_c45_scan(bus);
+
+ if (!prevent_c45_scan && bus->read_c45) {
+ err = mdiobus_scan_bus_c45(bus);
+ if (err)
+ 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:
+ for (i = 0; i < PHY_MAX_ADDR; i++) {
+ 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);
struct netlink_ext_ack *extack);
extern const struct bus_type mdio_bus_type;
+extern const struct class mdio_bus_class;
struct mdio_board_info {
const char *bus_id;
projects / thirdparty / linux.git / commitdiff
