--- /dev/null
+From c6de6de7d3df13822872ac756eebe868d236297a Mon Sep 17 00:00:00 2001
+From: Russell King <rmk+kernel@arm.linux.org.uk>
+Date: Tue, 22 Sep 2015 20:52:18 +0100
+Subject: [PATCH 718/744] phylink: add phylink infrastructure
+
+The link between the ethernet MAC and its PHY has become more complex
+as the interface evolves. This is especially true with serdes links,
+where the part of the PHY is effectively integrated into the MAC.
+
+Serdes links can be connected to a variety of devices, including SFF
+modules soldered down onto the board with the MAC, a SFP cage with
+a hotpluggable SFP module which may contain a PHY or directly modulate
+the serdes signals onto optical media with or without a PHY, or even
+a classical PHY connection.
+
+Moreover, the negotiation information on serdes links comes in two
+varieties - SGMII mode, where the PHY provides its speed/duplex/flow
+control information to the MAC, and 1000base-X mode where both ends
+exchange their abilities and each resolve the link capabilities.
+
+This means we need a more flexible means to support these arrangements,
+particularly with the hotpluggable nature of SFP, where the PHY can
+be attached or detached after the network device has been brought up.
+
+Ethtool information can come from multiple sources:
+- we may have a PHY operating in either SGMII or 1000base-X mode, in
+ which case we take ethtool/mii data directly from the PHY.
+- we may have a optical SFP module without a PHY, with the MAC
+ operating in 1000base-X mode - the ethtool/mii data needs to come
+ from the MAC.
+- we may have a copper SFP module with a PHY whic can't be accessed,
+ which means we need to take ethtool/mii data from the MAC.
+
+Phylink aims to solve this by providing an intermediary between the
+MAC and PHY, providing a safe way for PHYs to be hotplugged, and
+allowing a SFP driver to reconfigure the serdes connection.
+
+Phylink also takes over support of fixed link connections, where
+the speed/duplex/flow control are fixed, but link status may be
+controlled by a GPIO signal. By avoiding the fixed-phy implementation,
+phylink can provide a faster response to link events: fixed-phy has
+to wait for phylib to operate its state machine, which can take
+several seconds. In comparison, phylink takes milliseconds.
+
+Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
+---
+ drivers/net/phy/Kconfig | 10 +
+ drivers/net/phy/Makefile | 1 +
+ drivers/net/phy/phy_device.c | 1 +
+ drivers/net/phy/phylink.c | 816 +++++++++++++++++++++++++++++++++++++++++++
+ include/linux/phy.h | 2 +
+ include/linux/phylink.h | 70 ++++
+ 6 files changed, 900 insertions(+)
+ create mode 100644 drivers/net/phy/phylink.c
+ create mode 100644 include/linux/phylink.h
+
+--- a/drivers/net/phy/Kconfig
++++ b/drivers/net/phy/Kconfig
+@@ -10,6 +10,16 @@ menuconfig PHYLIB
+ devices. This option provides infrastructure for
+ managing PHY devices.
+
++config PHYLINK
++ tristate
++ depends on NETDEVICES
++ select PHYLIB
++ select SWPHY
++ help
++ PHYlink models the link between the PHY and MAC, allowing fixed
++ configuration links, PHYs, and Serdes links with MAC level
++ autonegotiation modes.
++
+ if PHYLIB
+
+ config MDIO_BOARDINFO
+--- a/drivers/net/phy/Makefile
++++ b/drivers/net/phy/Makefile
+@@ -5,6 +5,7 @@ libphy-$(CONFIG_SWPHY) += swphy.o
+
+ obj-$(CONFIG_MDIO_BOARDINFO) += mdio-boardinfo.o
+
++obj-$(CONFIG_PHYLINK) += phylink.o
+ obj-$(CONFIG_PHYLIB) += libphy.o
+ obj-$(CONFIG_SWCONFIG) += swconfig.o
+ obj-$(CONFIG_AQUANTIA_PHY) += aquantia.o
+--- a/drivers/net/phy/phy_device.c
++++ b/drivers/net/phy/phy_device.c
+@@ -754,6 +754,7 @@ void phy_detach(struct phy_device *phyde
+ phydev->attached_dev->phydev = NULL;
+ phydev->attached_dev = NULL;
+ phy_suspend(phydev);
++ phydev->phylink = NULL;
+
+ /* If the device had no specific driver before (i.e. - it
+ * was using the generic driver), we unbind the device
+--- /dev/null
++++ b/drivers/net/phy/phylink.c
+@@ -0,0 +1,816 @@
++/*
++ * phylink models the MAC to optional PHY connection, supporting
++ * technologies such as SFP cages where the PHY is hot-pluggable.
++ *
++ * Copyright (C) 2015 Russell King
++ *
++ * This program is free software; you can redistribute it and/or modify
++ * it under the terms of the GNU General Public License version 2 as
++ * published by the Free Software Foundation.
++ */
++#include <linux/ethtool.h>
++#include <linux/export.h>
++#include <linux/gpio/consumer.h>
++#include <linux/netdevice.h>
++#include <linux/of.h>
++#include <linux/of_mdio.h>
++#include <linux/phy.h>
++#include <linux/phy_fixed.h>
++#include <linux/phylink.h>
++#include <linux/spinlock.h>
++#include <linux/workqueue.h>
++
++#include "swphy.h"
++
++#define SUPPORTED_INTERFACES \
++ (SUPPORTED_TP | SUPPORTED_MII | SUPPORTED_FIBRE | \
++ SUPPORTED_BNC | SUPPORTED_AUI | SUPPORTED_Backplane)
++#define ADVERTISED_INTERFACES \
++ (ADVERTISED_TP | ADVERTISED_MII | ADVERTISED_FIBRE | \
++ ADVERTISED_BNC | ADVERTISED_AUI | ADVERTISED_Backplane)
++
++enum {
++ PHYLINK_DISABLE_STOPPED,
++};
++
++struct phylink {
++ struct net_device *netdev;
++ const struct phylink_mac_ops *ops;
++ struct mutex config_mutex;
++
++ unsigned long phylink_disable_state; /* bitmask of disables */
++ struct phy_device *phydev;
++ phy_interface_t link_interface; /* PHY_INTERFACE_xxx */
++ u8 link_an_mode; /* MLO_AN_xxx */
++ u8 link_port; /* The current non-phy ethtool port */
++ u32 link_port_support; /* SUPPORTED_xxx ethtool for ports */
++
++ /* The link configuration settings */
++ struct phylink_link_state link_config;
++ struct gpio_desc *link_gpio;
++
++ struct mutex state_mutex; /* may be taken within config_mutex */
++ struct phylink_link_state phy_state;
++ struct work_struct resolve;
++
++ bool mac_link_up;
++};
++
++static const char *phylink_an_mode_str(unsigned int mode)
++{
++ static const char *modestr[] = {
++ [MLO_AN_PHY] = "phy",
++ [MLO_AN_FIXED] = "fixed",
++ [MLO_AN_SGMII] = "SGMII",
++ [MLO_AN_8023Z] = "802.3z",
++ };
++
++ return mode < ARRAY_SIZE(modestr) ? modestr[mode] : "unknown";
++}
++
++static int phylink_parse_fixedlink(struct phylink *pl, struct device_node *np)
++{
++ struct device_node *fixed_node;
++ int ret, len;
++
++ fixed_node = of_get_child_by_name(np, "fixed-link");
++ if (fixed_node) {
++ struct gpio_desc *desc;
++ u32 speed;
++
++ ret = of_property_read_u32(fixed_node, "speed", &speed);
++
++ pl->link_an_mode = MLO_AN_FIXED;
++ pl->link_config.link = 1;
++ pl->link_config.an_complete = 1;
++ pl->link_config.speed = speed;
++ pl->link_config.duplex = DUPLEX_HALF;
++ pl->link_config.pause = MLO_PAUSE_NONE;
++
++ if (of_property_read_bool(fixed_node, "full-duplex"))
++ pl->link_config.duplex = DUPLEX_FULL;
++ if (of_property_read_bool(fixed_node, "pause"))
++ pl->link_config.pause |= MLO_PAUSE_SYM;
++ if (of_property_read_bool(fixed_node, "asym-pause"))
++ pl->link_config.pause |= MLO_PAUSE_ASYM;
++
++ if (ret == 0) {
++ desc = fwnode_get_named_gpiod(&fixed_node->fwnode,
++ "link-gpios");
++
++ if (!IS_ERR(desc))
++ pl->link_gpio = desc;
++ else if (desc == ERR_PTR(-EPROBE_DEFER))
++ ret = -EPROBE_DEFER;
++ }
++ of_node_put(fixed_node);
++ } else {
++ const __be32 *fixed_prop;
++
++ fixed_prop = of_get_property(np, "fixed-link", &len);
++ if (fixed_prop && len == 5 * sizeof(*fixed_prop)) {
++ pl->link_config.duplex = be32_to_cpu(fixed_prop[1]) ?
++ DUPLEX_FULL : DUPLEX_HALF;
++ pl->link_config.speed = be32_to_cpu(fixed_prop[2]);
++ pl->link_config.pause = MLO_PAUSE_NONE;
++ if (be32_to_cpu(fixed_prop[3]))
++ pl->link_config.pause |= MLO_PAUSE_SYM;
++ if (be32_to_cpu(fixed_prop[4]))
++ pl->link_config.pause |= MLO_PAUSE_ASYM;
++
++ pl->link_an_mode = MLO_AN_FIXED;
++ }
++ ret = 0;
++ }
++
++ if (pl->link_an_mode == MLO_AN_FIXED) {
++ /* Generate the supported/advertising masks */
++ if (pl->link_config.pause & MLO_PAUSE_SYM) {
++ pl->link_config.supported |= SUPPORTED_Pause;
++ pl->link_config.advertising |= ADVERTISED_Pause;
++ }
++ if (pl->link_config.pause & MLO_PAUSE_ASYM) {
++ pl->link_config.supported |= SUPPORTED_Asym_Pause;
++ pl->link_config.advertising |= ADVERTISED_Asym_Pause;
++ }
++
++ if (pl->link_config.speed > SPEED_1000 &&
++ pl->link_config.duplex != DUPLEX_FULL)
++ netdev_warn(pl->netdev, "fixed link specifies half duplex for %dMbps link?\n",
++ pl->link_config.speed);
++
++#define S(spd) \
++ pl->link_config.supported |= pl->link_config.duplex ? \
++ SUPPORTED_##spd##_Full : SUPPORTED_##spd##_Half
++#define A(spd) \
++ pl->link_config.advertising |= pl->link_config.duplex ? \
++ ADVERTISED_##spd##_Full : ADVERTISED_##spd##_Half
++#define C(spd, tech) \
++ case spd: \
++ S(spd##tech); \
++ A(spd##tech); \
++ break
++ switch (pl->link_config.speed) {
++ C(10, baseT);
++ C(100, baseT);
++ C(1000, baseT);
++#undef S
++#undef A
++#define S(spd) pl->link_config.supported |= SUPPORTED_##spd##_Full
++#define A(spd) pl->link_config.advertising |= ADVERTISED_##spd##_Full
++ C(2500, baseX);
++ C(10000, baseT);
++ }
++#undef S
++#undef A
++#undef C
++ }
++ return ret;
++}
++
++static int phylink_parse_managed(struct phylink *pl, struct device_node *np)
++{
++ const char *managed;
++
++ if (of_property_read_string(np, "managed", &managed) == 0 &&
++ strcmp(managed, "in-band-status") == 0) {
++ if (pl->link_an_mode == MLO_AN_FIXED) {
++ netdev_err(pl->netdev,
++ "can't use both fixed-link and in-band-status\n");
++ return -EINVAL;
++ }
++ pl->link_an_mode = MLO_AN_SGMII;
++ pl->link_config.an_enabled = true;
++ }
++
++ return 0;
++}
++
++
++static int phylink_get_support(struct phylink *pl, unsigned int mode)
++{
++ struct phylink_link_state state = pl->link_config;
++ int ret;
++
++ ret = pl->ops->mac_get_support(pl->netdev, mode, &state);
++ if (ret == 0) {
++ pl->link_an_mode = mode;
++ pl->link_config = state;
++ }
++
++ return ret;
++}
++
++static void phylink_mac_config(struct phylink *pl,
++ const struct phylink_link_state *state)
++{
++ pl->ops->mac_config(pl->netdev, pl->link_an_mode, state);
++}
++
++static void phylink_mac_an_restart(struct phylink *pl)
++{
++ if (pl->link_config.an_enabled)
++ pl->ops->mac_an_restart(pl->netdev, pl->link_an_mode);
++}
++
++static int phylink_get_mac_state(struct phylink *pl, struct phylink_link_state *state)
++{
++ struct net_device *ndev = pl->netdev;
++
++ state->supported = pl->link_config.supported;
++ state->advertising = pl->link_config.advertising;
++ state->an_enabled = pl->link_config.an_enabled;
++ state->link = 1;
++ state->sync = 1;
++
++ return pl->ops->mac_link_state(ndev, state);
++}
++
++/* The fixed state is... fixed except for the link state,
++ * which may be determined by a GPIO.
++ */
++static void phylink_get_fixed_state(struct phylink *pl, struct phylink_link_state *state)
++{
++ *state = pl->link_config;
++ if (pl->link_gpio)
++ state->link = !!gpiod_get_value(pl->link_gpio);
++}
++
++extern const char *phy_speed_to_str(int speed);
++
++static void phylink_resolve(struct work_struct *w)
++{
++ struct phylink *pl = container_of(w, struct phylink, resolve);
++ struct phylink_link_state link_state;
++ struct net_device *ndev = pl->netdev;
++
++ mutex_lock(&pl->state_mutex);
++ if (pl->phylink_disable_state) {
++ link_state.link = false;
++ } else {
++ switch (pl->link_an_mode) {
++ case MLO_AN_PHY:
++ link_state = pl->phy_state;
++ break;
++
++ case MLO_AN_FIXED:
++ phylink_get_fixed_state(pl, &link_state);
++ break;
++
++ case MLO_AN_SGMII:
++ phylink_get_mac_state(pl, &link_state);
++ if (pl->phydev)
++ link_state.link = link_state.link &&
++ pl->phy_state.link;
++ break;
++
++ case MLO_AN_8023Z:
++ phylink_get_mac_state(pl, &link_state);
++ break;
++ }
++ }
++
++ if (link_state.link != netif_carrier_ok(ndev)) {
++ if (!link_state.link) {
++ netif_carrier_off(ndev);
++ pl->ops->mac_link_down(ndev, pl->link_an_mode);
++ netdev_info(ndev, "Link is Down\n");
++ } else {
++ /* If we have a PHY, we need the MAC updated with
++ * the current link parameters (eg, in SGMII mode,
++ * with flow control status.)
++ */
++ if (pl->phydev)
++ phylink_mac_config(pl, &link_state);
++
++ pl->ops->mac_link_up(ndev, pl->link_an_mode);
++
++ netif_carrier_on(ndev);
++
++ netdev_info(ndev,
++ "Link is Up - %s/%s - flow control %s\n",
++ phy_speed_to_str(link_state.speed),
++ link_state.duplex ? "Full" : "Half",
++ link_state.pause ? "rx/tx" : "off");
++ }
++ }
++ mutex_unlock(&pl->state_mutex);
++}
++
++static void phylink_run_resolve(struct phylink *pl)
++{
++ if (!pl->phylink_disable_state)
++ queue_work(system_power_efficient_wq, &pl->resolve);
++}
++
++struct phylink *phylink_create(struct net_device *ndev, struct device_node *np,
++ phy_interface_t iface, const struct phylink_mac_ops *ops)
++{
++ struct phylink *pl;
++ int ret;
++
++ pl = kzalloc(sizeof(*pl), GFP_KERNEL);
++ if (!pl)
++ return ERR_PTR(-ENOMEM);
++
++ mutex_init(&pl->state_mutex);
++ mutex_init(&pl->config_mutex);
++ INIT_WORK(&pl->resolve, phylink_resolve);
++ pl->netdev = ndev;
++ pl->link_interface = iface;
++ pl->link_port_support = SUPPORTED_MII;
++ pl->link_port = PORT_MII;
++ pl->ops = ops;
++ __set_bit(PHYLINK_DISABLE_STOPPED, &pl->phylink_disable_state);
++
++ ret = phylink_parse_fixedlink(pl, np);
++ if (ret < 0) {
++ kfree(pl);
++ return ERR_PTR(ret);
++ }
++
++ ret = phylink_parse_managed(pl, np);
++ if (ret < 0) {
++ kfree(pl);
++ return ERR_PTR(ret);
++ }
++
++ ret = phylink_get_support(pl, pl->link_an_mode);
++ if (ret) {
++ kfree(pl);
++ return ERR_PTR(ret);
++ }
++
++ return pl;
++}
++EXPORT_SYMBOL_GPL(phylink_create);
++
++void phylink_destroy(struct phylink *pl)
++{
++ cancel_work_sync(&pl->resolve);
++ kfree(pl);
++}
++EXPORT_SYMBOL_GPL(phylink_destroy);
++
++void phylink_phy_change(struct phy_device *phy, bool up, bool do_carrier)
++{
++ struct phylink *pl = phy->phylink;
++
++ mutex_lock(&pl->state_mutex);
++ pl->phy_state.speed = phy->speed;
++ pl->phy_state.duplex = phy->duplex;
++ pl->phy_state.pause = MLO_PAUSE_NONE;
++ if (phy->pause)
++ pl->phy_state.pause |= MLO_PAUSE_SYM;
++ if (phy->asym_pause)
++ pl->phy_state.pause |= MLO_PAUSE_ASYM;
++ pl->phy_state.link = up;
++ mutex_unlock(&pl->state_mutex);
++
++ phylink_run_resolve(pl);
++
++ netdev_dbg(pl->netdev, "phy link %s\n", up ? "up" : "down");
++}
++
++static int phylink_bringup_phy(struct phylink *pl, struct phy_device *phy)
++{
++ mutex_lock(&pl->config_mutex);
++ phy->phylink = pl;
++ phy->phy_link_change = phylink_phy_change;
++
++ netdev_info(pl->netdev,
++ "PHY [%s] driver [%s]\n", dev_name(&phy->dev),
++ phy->drv->name);
++
++ mutex_lock(&pl->state_mutex);
++ pl->phydev = phy;
++
++ /* Restrict the phy advertisment to the union of the PHY and
++ * MAC-level advert.
++ */
++ phy->advertising &= ADVERTISED_INTERFACES |
++ pl->link_config.advertising;
++ mutex_unlock(&pl->state_mutex);
++
++ phy_start_machine(phy);
++ if (phy->irq > 0)
++ phy_start_interrupts(phy);
++
++ mutex_unlock(&pl->config_mutex);
++
++ return 0;
++}
++
++int phylink_connect_phy(struct phylink *pl, struct phy_device *phy)
++{
++ int ret;
++
++ ret = phy_attach_direct(pl->netdev, phy, 0, pl->link_interface);
++ if (ret)
++ return ret;
++
++ ret = phylink_bringup_phy(pl, phy);
++ if (ret)
++ phy_detach(phy);
++
++ return ret;
++}
++EXPORT_SYMBOL_GPL(phylink_connect_phy);
++
++int phylink_of_phy_connect(struct phylink *pl, struct device_node *dn)
++{
++ struct device_node *phy_node;
++ struct phy_device *phy_dev;
++ int ret;
++
++ /* Fixed links are handled without needing a PHY */
++ if (pl->link_an_mode == MLO_AN_FIXED)
++ return 0;
++
++ phy_node = of_parse_phandle(dn, "phy-handle", 0);
++ if (!phy_node)
++ phy_node = of_parse_phandle(dn, "phy", 0);
++ if (!phy_node)
++ phy_node = of_parse_phandle(dn, "phy-device", 0);
++
++ if (!phy_node) {
++ if (pl->link_an_mode == MLO_AN_PHY) {
++ netdev_err(pl->netdev, "unable to find PHY node\n");
++ return -ENODEV;
++ }
++ return 0;
++ }
++
++ phy_dev = of_phy_attach(pl->netdev, phy_node, 0, pl->link_interface);
++ /* We're done with the phy_node handle */
++ of_node_put(phy_node);
++
++ if (!phy_dev)
++ return -ENODEV;
++
++ ret = phylink_bringup_phy(pl, phy_dev);
++ if (ret)
++ phy_detach(phy_dev);
++
++ return ret;
++}
++EXPORT_SYMBOL_GPL(phylink_of_phy_connect);
++
++void phylink_disconnect_phy(struct phylink *pl)
++{
++ struct phy_device *phy;
++
++ mutex_lock(&pl->config_mutex);
++ phy = pl->phydev;
++
++ mutex_lock(&pl->state_mutex);
++ pl->phydev = NULL;
++ mutex_unlock(&pl->state_mutex);
++ flush_work(&pl->resolve);
++
++ if (phy)
++ phy_disconnect(phy);
++
++ mutex_unlock(&pl->config_mutex);
++}
++EXPORT_SYMBOL_GPL(phylink_disconnect_phy);
++
++void phylink_mac_change(struct phylink *pl, bool up)
++{
++ phylink_run_resolve(pl);
++ netdev_dbg(pl->netdev, "mac link %s\n", up ? "up" : "down");
++}
++EXPORT_SYMBOL_GPL(phylink_mac_change);
++
++void phylink_start(struct phylink *pl)
++{
++ mutex_lock(&pl->config_mutex);
++
++ netdev_info(pl->netdev, "configuring for %s link mode\n",
++ phylink_an_mode_str(pl->link_an_mode));
++
++ /* Apply the link configuration to the MAC when starting. This allows
++ * a fixed-link to start with the correct parameters, and also
++ * ensures that we set the appropriate advertisment for Serdes links.
++ */
++ phylink_mac_config(pl, &pl->link_config);
++
++ clear_bit(PHYLINK_DISABLE_STOPPED, &pl->phylink_disable_state);
++ phylink_run_resolve(pl);
++
++ if (pl->phydev)
++ phy_start(pl->phydev);
++
++ mutex_unlock(&pl->config_mutex);
++}
++EXPORT_SYMBOL_GPL(phylink_start);
++
++void phylink_stop(struct phylink *pl)
++{
++ mutex_lock(&pl->config_mutex);
++
++ if (pl->phydev)
++ phy_stop(pl->phydev);
++
++ set_bit(PHYLINK_DISABLE_STOPPED, &pl->phylink_disable_state);
++ flush_work(&pl->resolve);
++
++ pl->mac_link_up = false;
++
++ mutex_unlock(&pl->config_mutex);
++}
++EXPORT_SYMBOL_GPL(phylink_stop);
++
++static void phylink_get_ethtool(const struct phylink_link_state *state,
++ struct ethtool_cmd *cmd)
++{
++ cmd->supported &= SUPPORTED_INTERFACES;
++ cmd->supported |= state->supported;
++ cmd->advertising &= ADVERTISED_INTERFACES;
++ cmd->advertising |= state->advertising;
++ ethtool_cmd_speed_set(cmd, state->speed);
++ cmd->duplex = state->duplex;
++
++ cmd->autoneg = state->an_enabled ? AUTONEG_ENABLE : AUTONEG_DISABLE;
++}
++
++static int phylink_ethtool_gset(struct phylink *pl, struct ethtool_cmd *cmd)
++{
++ struct phylink_link_state link_state;
++ int ret;
++
++ if (pl->phydev) {
++ ret = phy_ethtool_gset(pl->phydev, cmd);
++ if (ret)
++ return ret;
++
++ cmd->supported &= SUPPORTED_INTERFACES |
++ pl->link_config.supported;
++ } else {
++ cmd->supported = pl->link_port_support;
++ cmd->transceiver = XCVR_EXTERNAL;
++ cmd->port = pl->link_port;
++ }
++
++ switch (pl->link_an_mode) {
++ case MLO_AN_FIXED:
++ /* We are using fixed settings. Report these as the
++ * current link settings - and note that these also
++ * represent the supported speeds/duplex/pause modes.
++ */
++ phylink_get_fixed_state(pl, &link_state);
++ phylink_get_ethtool(&link_state, cmd);
++ break;
++
++ case MLO_AN_SGMII:
++ /* If there is a phy attached, then use the reported
++ * settings from the phy with no modification.
++ */
++ if (pl->phydev)
++ break;
++
++ case MLO_AN_8023Z:
++ phylink_get_mac_state(pl, &link_state);
++
++ /* The MAC is reporting the link results from its own PCS
++ * layer via in-band status. Report these as the current
++ * link settings.
++ */
++ phylink_get_ethtool(&link_state, cmd);
++ break;
++ }
++
++ return 0;
++}
++
++int phylink_ethtool_get_settings(struct phylink *pl, struct ethtool_cmd *cmd)
++{
++ int ret;
++
++ mutex_lock(&pl->config_mutex);
++ ret = phylink_ethtool_gset(pl, cmd);
++ mutex_unlock(&pl->config_mutex);
++
++ return ret;
++}
++EXPORT_SYMBOL_GPL(phylink_ethtool_get_settings);
++
++static int phylink_ethtool_sset(struct phylink *pl, struct ethtool_cmd *cmd)
++{
++ u32 supported;
++ int ret;
++
++ /* Calculate the union of the MAC support and attached phy support */
++ supported = pl->link_config.supported;
++ if (pl->phydev)
++ supported &= pl->phydev->supported;
++
++ /* Mask out unsupported advertisments */
++ cmd->advertising &= supported;
++
++ /* FIXME: should we reject autoneg if phy/mac does not support it? */
++
++ if (cmd->autoneg == AUTONEG_DISABLE) {
++ /* Autonegotiation disabled, validate speed and duplex */
++ if (cmd->duplex != DUPLEX_HALF && cmd->duplex != DUPLEX_FULL)
++ return -EINVAL;
++
++ /* FIXME: validate speed/duplex against supported */
++
++ cmd->advertising &= ~ADVERTISED_Autoneg;
++ } else {
++ /* Autonegotiation enabled, validate advertisment */
++ /* FIXME: shouldn't we ensure there's some duplex/speeds set */
++ if (cmd->advertising == 0)
++ return -EINVAL;
++
++ cmd->advertising |= ADVERTISED_Autoneg;
++ }
++
++ /* If we have a fixed link (as specified by firmware), refuse
++ * to enable autonegotiation, or change link parameters.
++ */
++ if (pl->link_an_mode == MLO_AN_FIXED) {
++ if (cmd->autoneg != AUTONEG_DISABLE ||
++ ethtool_cmd_speed(cmd) != pl->link_config.speed ||
++ cmd->duplex != pl->link_config.duplex)
++ return -EINVAL;
++ }
++
++ /* If we have a PHY, configure the phy */
++ if (pl->phydev) {
++ ret = phy_ethtool_sset(pl->phydev, cmd);
++ if (ret)
++ return ret;
++ }
++
++ mutex_lock(&pl->state_mutex);
++ /* Configure the MAC to match the new settings */
++ pl->link_config.advertising = cmd->advertising;
++ pl->link_config.speed = cmd->speed;
++ pl->link_config.duplex = cmd->duplex;
++ pl->link_config.an_enabled = cmd->autoneg != AUTONEG_DISABLE;
++
++ phylink_mac_config(pl, &pl->link_config);
++ phylink_mac_an_restart(pl);
++ mutex_unlock(&pl->state_mutex);
++
++ return ret;
++}
++
++int phylink_ethtool_set_settings(struct phylink *pl, struct ethtool_cmd *cmd)
++{
++ int ret;
++
++ if (cmd->autoneg != AUTONEG_DISABLE && cmd->autoneg != AUTONEG_ENABLE)
++ return -EINVAL;
++
++ mutex_lock(&pl->config_mutex);
++ ret = phylink_ethtool_sset(pl, cmd);
++ mutex_unlock(&pl->config_mutex);
++
++ return ret;
++}
++EXPORT_SYMBOL_GPL(phylink_ethtool_set_settings);
++
++/* This emulates MII registers for a fixed-mode phy operating as per the
++ * passed in state. "aneg" defines if we report negotiation is possible.
++ *
++ * FIXME: should deal with negotiation state too.
++ */
++static int phylink_mii_emul_read(struct net_device *ndev, unsigned int reg,
++ struct phylink_link_state *state, bool aneg)
++{
++ struct fixed_phy_status fs;
++ int val;
++
++ fs.link = state->link;
++ fs.speed = state->speed;
++ fs.duplex = state->duplex;
++ fs.pause = state->pause & MLO_PAUSE_SYM;
++ fs.asym_pause = state->pause & MLO_PAUSE_ASYM;
++
++ val = swphy_read_reg(reg, &fs);
++ if (reg == MII_BMSR) {
++ if (!state->an_complete)
++ val &= ~BMSR_ANEGCOMPLETE;
++ if (!aneg)
++ val &= ~BMSR_ANEGCAPABLE;
++ }
++ return val;
++}
++
++static int phylink_mii_read(struct phylink *pl, unsigned int phy_id,
++ unsigned int reg)
++{
++ struct phylink_link_state state;
++ int val = 0xffff;
++
++ if (pl->phydev && pl->phydev->addr != phy_id)
++ return mdiobus_read(pl->phydev->bus, phy_id, reg);
++
++ if (!pl->phydev && phy_id != 0)
++ return val;
++
++ switch (pl->link_an_mode) {
++ case MLO_AN_FIXED:
++ phylink_get_fixed_state(pl, &state);
++ val = phylink_mii_emul_read(pl->netdev, reg, &state, true);
++ break;
++
++ case MLO_AN_PHY:
++ val = mdiobus_read(pl->phydev->bus, phy_id, reg);
++ break;
++
++ case MLO_AN_SGMII:
++ if (pl->phydev) {
++ val = mdiobus_read(pl->phydev->bus,
++ pl->phydev->addr, reg);
++ break;
++ }
++ /* No phy, fall through to reading the MAC end */
++ case MLO_AN_8023Z:
++ val = phylink_get_mac_state(pl, &state);
++ if (val < 0)
++ return val;
++
++ val = phylink_mii_emul_read(pl->netdev, reg, &state, true);
++ break;
++ }
++
++ return val & 0xffff;
++}
++
++static void phylink_mii_write(struct phylink *pl, unsigned int phy_id,
++ unsigned int reg, unsigned int val)
++{
++ if (pl->phydev && pl->phydev->addr != phy_id) {
++ mdiobus_write(pl->phydev->bus, phy_id, reg, val);
++ return;
++ }
++
++ if (!pl->phydev && phy_id != 0)
++ return;
++
++ switch (pl->link_an_mode) {
++ case MLO_AN_FIXED:
++ break;
++
++ case MLO_AN_PHY:
++ mdiobus_write(pl->phydev->bus, pl->phydev->addr,
++ reg, val);
++ break;
++
++ case MLO_AN_SGMII:
++ if (pl->phydev) {
++ mdiobus_write(pl->phydev->bus, phy_id, reg, val);
++ break;
++ }
++ /* No phy, fall through to reading the MAC end */
++ case MLO_AN_8023Z:
++ break;
++ }
++}
++
++int phylink_mii_ioctl(struct phylink *pl, struct ifreq *ifr, int cmd)
++{
++ struct mii_ioctl_data *mii_data = if_mii(ifr);
++ int val, ret;
++
++ mutex_lock(&pl->config_mutex);
++
++ switch (cmd) {
++ case SIOCGMIIPHY:
++ mii_data->phy_id = pl->phydev ? pl->phydev->addr : 0;
++ /* fallthrough */
++
++ case SIOCGMIIREG:
++ val = phylink_mii_read(pl, mii_data->phy_id, mii_data->reg_num);
++ if (val < 0) {
++ ret = val;
++ } else {
++ mii_data->val_out = val;
++ ret = 0;
++ }
++ break;
++
++ case SIOCSMIIREG:
++ phylink_mii_write(pl, mii_data->phy_id, mii_data->reg_num,
++ mii_data->val_in);
++ ret = 0;
++ break;
++
++ default:
++ ret = -EOPNOTSUPP;
++ if (pl->phydev)
++ ret = phy_mii_ioctl(pl->phydev, ifr, cmd);
++ break;
++ }
++
++ mutex_unlock(&pl->config_mutex);
++
++ return ret;
++}
++EXPORT_SYMBOL_GPL(phylink_mii_ioctl);
++
++MODULE_LICENSE("GPL");
+--- a/include/linux/phy.h
++++ b/include/linux/phy.h
+@@ -147,6 +147,7 @@ static inline const char *phy_modes(phy_
+ #define MII_ADDR_C45 (1<<30)
+
+ struct device;
++struct phylink;
+ struct sk_buff;
+
+ /*
+@@ -429,6 +430,7 @@ struct phy_device {
+
+ struct mutex lock;
+
++ struct phylink *phylink;
+ struct net_device *attached_dev;
+
+ u8 mdix;
+--- /dev/null
++++ b/include/linux/phylink.h
+@@ -0,0 +1,70 @@
++#ifndef NETDEV_PCS_H
++#define NETDEV_PCS_H
++
++#include <linux/phy.h>
++#include <linux/spinlock.h>
++#include <linux/workqueue.h>
++
++struct device_node;
++struct ethtool_cmd;
++struct net_device;
++
++enum {
++ MLO_PAUSE_NONE,
++ MLO_PAUSE_ASYM = BIT(0),
++ MLO_PAUSE_SYM = BIT(1),
++
++ MLO_AN_PHY = 0,
++ MLO_AN_FIXED,
++ MLO_AN_SGMII,
++ MLO_AN_8023Z,
++};
++
++struct phylink_link_state {
++ u32 supported;
++ u32 advertising;
++ u32 lp_advertising;
++ int speed;
++ int duplex;
++ int pause;
++ unsigned int link:1;
++ unsigned int sync:1;
++ unsigned int an_enabled:1;
++ unsigned int an_complete:1;
++};
++
++struct phylink_mac_ops {
++ /* Get the ethtool supported mask for the indicated mode */
++ int (*mac_get_support)(struct net_device *, unsigned int mode,
++ struct phylink_link_state *);
++
++ /* Read the current link state from the hardware */
++ int (*mac_link_state)(struct net_device *, struct phylink_link_state *);
++
++ /* Configure the MAC */
++ void (*mac_config)(struct net_device *, unsigned int mode,
++ const struct phylink_link_state *);
++ void (*mac_an_restart)(struct net_device *, unsigned int mode);
++
++ void (*mac_link_down)(struct net_device *, unsigned int mode);
++ void (*mac_link_up)(struct net_device *, unsigned int mode);
++};
++
++struct phylink *phylink_create(struct net_device *, struct device_node *,
++ phy_interface_t iface, const struct phylink_mac_ops *ops);
++void phylink_destroy(struct phylink *);
++
++int phylink_connect_phy(struct phylink *, struct phy_device *);
++int phylink_of_phy_connect(struct phylink *, struct device_node *);
++void phylink_disconnect_phy(struct phylink *);
++
++void phylink_mac_change(struct phylink *, bool up);
++
++void phylink_start(struct phylink *);
++void phylink_stop(struct phylink *);
++
++int phylink_ethtool_get_settings(struct phylink *, struct ethtool_cmd *);
++int phylink_ethtool_set_settings(struct phylink *, struct ethtool_cmd *);
++int phylink_mii_ioctl(struct phylink *, struct ifreq *, int);
++
++#endif
projects / openwrt / openwrt.git / blobdiff