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1028 lines
26 KiB
1028 lines
26 KiB
// 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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|
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#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
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|
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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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|
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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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|
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if (!mdio_bus_np) |
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return NULL; |
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|
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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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|
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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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|
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if (dev->of_node || !bus->dev.of_node) |
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return; |
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|
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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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|
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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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|
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if (addr == mdiodev->addr) { |
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device_set_node(dev, of_fwnode_handle(child)); |
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return; |
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} |
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} |
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} |
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#else /* !IS_ENABLED(CONFIG_OF_MDIO) */ |
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static inline void of_mdiobus_link_mdiodev(struct mii_bus *mdio, |
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struct mdio_device *mdiodev) |
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{ |
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} |
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#endif |
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|
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/** |
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* mdiobus_create_device - create a full MDIO device given |
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* a mdio_board_info structure |
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* @bus: MDIO bus to create the devices on |
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* @bi: mdio_board_info structure describing the devices |
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* |
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* Returns 0 on success or < 0 on error. |
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*/ |
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static int mdiobus_create_device(struct mii_bus *bus, |
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struct mdio_board_info *bi) |
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{ |
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struct mdio_device *mdiodev; |
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int ret = 0; |
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|
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mdiodev = mdio_device_create(bus, bi->mdio_addr); |
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if (IS_ERR(mdiodev)) |
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return -ENODEV; |
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|
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strncpy(mdiodev->modalias, bi->modalias, |
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sizeof(mdiodev->modalias)); |
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mdiodev->bus_match = mdio_device_bus_match; |
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mdiodev->dev.platform_data = (void *)bi->platform_data; |
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|
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ret = mdio_device_register(mdiodev); |
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if (ret) |
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mdio_device_free(mdiodev); |
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|
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return ret; |
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} |
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|
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/** |
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* __mdiobus_register - bring up all the PHYs on a given bus and attach them to bus |
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* @bus: target mii_bus |
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* @owner: module containing bus accessor functions |
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* |
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* Description: Called by a bus driver to bring up all the PHYs |
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* on a given bus, and attach them to the bus. Drivers should use |
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* mdiobus_register() rather than __mdiobus_register() unless they |
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* 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; |
|
|
|
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); |
|
|
|
/* 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 & (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; |
|
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; |
|
} |
|
|
|
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; |
|
|
|
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); |
|
|
|
/** |
|
* 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
|
|
|