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// SPDX-License-Identifier: GPL-2.0
/*
* Microchip switch driver main logic
*
* Copyright (C) 2017-2019 Microchip Technology Inc.
*/
#include <linux/delay.h>
#include <linux/export.h>
#include <linux/gpio/consumer.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/platform_data/microchip-ksz.h>
#include <linux/phy.h>
#include <linux/etherdevice.h>
#include <linux/if_bridge.h>
#include <linux/of_net.h>
#include <net/dsa.h>
#include <net/switchdev.h>
#include "ksz_common.h"
void ksz_update_port_member(struct ksz_device *dev, int port)
{
struct ksz_port *p;
int i;
for (i = 0; i < dev->port_cnt; i++) {
if (i == port || i == dev->cpu_port)
continue;
p = &dev->ports[i];
if (!(dev->member & (1 << i)))
continue;
/* Port is a member of the bridge and is forwarding. */
if (p->stp_state == BR_STATE_FORWARDING &&
p->member != dev->member)
dev->dev_ops->cfg_port_member(dev, i, dev->member);
}
}
EXPORT_SYMBOL_GPL(ksz_update_port_member);
static void port_r_cnt(struct ksz_device *dev, int port)
{
struct ksz_port_mib *mib = &dev->ports[port].mib;
u64 *dropped;
/* Some ports may not have MIB counters before SWITCH_COUNTER_NUM. */
while (mib->cnt_ptr < dev->reg_mib_cnt) {
dev->dev_ops->r_mib_cnt(dev, port, mib->cnt_ptr,
&mib->counters[mib->cnt_ptr]);
++mib->cnt_ptr;
}
/* last one in storage */
dropped = &mib->counters[dev->mib_cnt];
/* Some ports may not have MIB counters after SWITCH_COUNTER_NUM. */
while (mib->cnt_ptr < dev->mib_cnt) {
dev->dev_ops->r_mib_pkt(dev, port, mib->cnt_ptr,
dropped, &mib->counters[mib->cnt_ptr]);
++mib->cnt_ptr;
}
mib->cnt_ptr = 0;
}
static void ksz_mib_read_work(struct work_struct *work)
{
struct ksz_device *dev = container_of(work, struct ksz_device,
mib_read.work);
struct ksz_port_mib *mib;
struct ksz_port *p;
int i;
for (i = 0; i < dev->mib_port_cnt; i++) {
if (dsa_is_unused_port(dev->ds, i))
continue;
p = &dev->ports[i];
mib = &p->mib;
mutex_lock(&mib->cnt_mutex);
/* Only read MIB counters when the port is told to do.
* If not, read only dropped counters when link is not up.
*/
if (!p->read) {
const struct dsa_port *dp = dsa_to_port(dev->ds, i);
if (!netif_carrier_ok(dp->slave))
mib->cnt_ptr = dev->reg_mib_cnt;
}
port_r_cnt(dev, i);
p->read = false;
mutex_unlock(&mib->cnt_mutex);
}
schedule_delayed_work(&dev->mib_read, dev->mib_read_interval);
}
void ksz_init_mib_timer(struct ksz_device *dev)
{
int i;
INIT_DELAYED_WORK(&dev->mib_read, ksz_mib_read_work);
/* Read MIB counters every 30 seconds to avoid overflow. */
dev->mib_read_interval = msecs_to_jiffies(30000);
for (i = 0; i < dev->mib_port_cnt; i++)
dev->dev_ops->port_init_cnt(dev, i);
/* Start the timer 2 seconds later. */
schedule_delayed_work(&dev->mib_read, msecs_to_jiffies(2000));
}
EXPORT_SYMBOL_GPL(ksz_init_mib_timer);
int ksz_phy_read16(struct dsa_switch *ds, int addr, int reg)
{
struct ksz_device *dev = ds->priv;
u16 val = 0xffff;
dev->dev_ops->r_phy(dev, addr, reg, &val);
return val;
}
EXPORT_SYMBOL_GPL(ksz_phy_read16);
int ksz_phy_write16(struct dsa_switch *ds, int addr, int reg, u16 val)
{
struct ksz_device *dev = ds->priv;
dev->dev_ops->w_phy(dev, addr, reg, val);
return 0;
}
EXPORT_SYMBOL_GPL(ksz_phy_write16);
void ksz_adjust_link(struct dsa_switch *ds, int port,
struct phy_device *phydev)
{
struct ksz_device *dev = ds->priv;
struct ksz_port *p = &dev->ports[port];
/* Read all MIB counters when the link is going down. */
if (!phydev->link) {
p->read = true;
schedule_delayed_work(&dev->mib_read, 0);
}
mutex_lock(&dev->dev_mutex);
if (!phydev->link)
dev->live_ports &= ~(1 << port);
else
/* Remember which port is connected and active. */
dev->live_ports |= (1 << port) & dev->on_ports;
mutex_unlock(&dev->dev_mutex);
}
EXPORT_SYMBOL_GPL(ksz_adjust_link);
int ksz_sset_count(struct dsa_switch *ds, int port, int sset)
{
struct ksz_device *dev = ds->priv;
if (sset != ETH_SS_STATS)
return 0;
return dev->mib_cnt;
}
EXPORT_SYMBOL_GPL(ksz_sset_count);
void ksz_get_ethtool_stats(struct dsa_switch *ds, int port, uint64_t *buf)
{
const struct dsa_port *dp = dsa_to_port(ds, port);
struct ksz_device *dev = ds->priv;
struct ksz_port_mib *mib;
mib = &dev->ports[port].mib;
mutex_lock(&mib->cnt_mutex);
/* Only read dropped counters if no link. */
if (!netif_carrier_ok(dp->slave))
mib->cnt_ptr = dev->reg_mib_cnt;
port_r_cnt(dev, port);
memcpy(buf, mib->counters, dev->mib_cnt * sizeof(u64));
mutex_unlock(&mib->cnt_mutex);
}
EXPORT_SYMBOL_GPL(ksz_get_ethtool_stats);
int ksz_port_bridge_join(struct dsa_switch *ds, int port,
struct net_device *br)
{
struct ksz_device *dev = ds->priv;
mutex_lock(&dev->dev_mutex);
dev->br_member |= (1 << port);
mutex_unlock(&dev->dev_mutex);
/* port_stp_state_set() will be called after to put the port in
* appropriate state so there is no need to do anything.
*/
return 0;
}
EXPORT_SYMBOL_GPL(ksz_port_bridge_join);
void ksz_port_bridge_leave(struct dsa_switch *ds, int port,
struct net_device *br)
{
struct ksz_device *dev = ds->priv;
mutex_lock(&dev->dev_mutex);
dev->br_member &= ~(1 << port);
dev->member &= ~(1 << port);
mutex_unlock(&dev->dev_mutex);
/* port_stp_state_set() will be called after to put the port in
* forwarding state so there is no need to do anything.
*/
}
EXPORT_SYMBOL_GPL(ksz_port_bridge_leave);
void ksz_port_fast_age(struct dsa_switch *ds, int port)
{
struct ksz_device *dev = ds->priv;
dev->dev_ops->flush_dyn_mac_table(dev, port);
}
EXPORT_SYMBOL_GPL(ksz_port_fast_age);
int ksz_port_vlan_prepare(struct dsa_switch *ds, int port,
const struct switchdev_obj_port_vlan *vlan)
{
/* nothing needed */
return 0;
}
EXPORT_SYMBOL_GPL(ksz_port_vlan_prepare);
int ksz_port_fdb_dump(struct dsa_switch *ds, int port, dsa_fdb_dump_cb_t *cb,
void *data)
{
struct ksz_device *dev = ds->priv;
int ret = 0;
u16 i = 0;
u16 entries = 0;
u8 timestamp = 0;
u8 fid;
u8 member;
struct alu_struct alu;
do {
alu.is_static = false;
ret = dev->dev_ops->r_dyn_mac_table(dev, i, alu.mac, &fid,
&member, ×tamp,
&entries);
if (!ret && (member & BIT(port))) {
ret = cb(alu.mac, alu.fid, alu.is_static, data);
if (ret)
break;
}
i++;
} while (i < entries);
if (i >= entries)
ret = 0;
return ret;
}
EXPORT_SYMBOL_GPL(ksz_port_fdb_dump);
int ksz_port_mdb_prepare(struct dsa_switch *ds, int port,
const struct switchdev_obj_port_mdb *mdb)
{
/* nothing to do */
return 0;
}
EXPORT_SYMBOL_GPL(ksz_port_mdb_prepare);
void ksz_port_mdb_add(struct dsa_switch *ds, int port,
const struct switchdev_obj_port_mdb *mdb)
{
struct ksz_device *dev = ds->priv;
struct alu_struct alu;
int index;
int empty = 0;
alu.port_forward = 0;
for (index = 0; index < dev->num_statics; index++) {
if (!dev->dev_ops->r_sta_mac_table(dev, index, &alu)) {
/* Found one already in static MAC table. */
if (!memcmp(alu.mac, mdb->addr, ETH_ALEN) &&
alu.fid == mdb->vid)
break;
/* Remember the first empty entry. */
} else if (!empty) {
empty = index + 1;
}
}
/* no available entry */
if (index == dev->num_statics && !empty)
return;
/* add entry */
if (index == dev->num_statics) {
index = empty - 1;
memset(&alu, 0, sizeof(alu));
memcpy(alu.mac, mdb->addr, ETH_ALEN);
alu.is_static = true;
}
alu.port_forward |= BIT(port);
if (mdb->vid) {
alu.is_use_fid = true;
/* Need a way to map VID to FID. */
alu.fid = mdb->vid;
}
dev->dev_ops->w_sta_mac_table(dev, index, &alu);
}
EXPORT_SYMBOL_GPL(ksz_port_mdb_add);
int ksz_port_mdb_del(struct dsa_switch *ds, int port,
const struct switchdev_obj_port_mdb *mdb)
{
struct ksz_device *dev = ds->priv;
struct alu_struct alu;
int index;
int ret = 0;
for (index = 0; index < dev->num_statics; index++) {
if (!dev->dev_ops->r_sta_mac_table(dev, index, &alu)) {
/* Found one already in static MAC table. */
if (!memcmp(alu.mac, mdb->addr, ETH_ALEN) &&
alu.fid == mdb->vid)
break;
}
}
/* no available entry */
if (index == dev->num_statics)
goto exit;
/* clear port */
alu.port_forward &= ~BIT(port);
if (!alu.port_forward)
alu.is_static = false;
dev->dev_ops->w_sta_mac_table(dev, index, &alu);
exit:
return ret;
}
EXPORT_SYMBOL_GPL(ksz_port_mdb_del);
int ksz_enable_port(struct dsa_switch *ds, int port, struct phy_device *phy)
{
struct ksz_device *dev = ds->priv;
if (!dsa_is_user_port(ds, port))
return 0;
/* setup slave port */
dev->dev_ops->port_setup(dev, port, false);
if (dev->dev_ops->phy_setup)
dev->dev_ops->phy_setup(dev, port, phy);
/* port_stp_state_set() will be called after to enable the port so
* there is no need to do anything.
*/
return 0;
}
EXPORT_SYMBOL_GPL(ksz_enable_port);
void ksz_disable_port(struct dsa_switch *ds, int port)
{
struct ksz_device *dev = ds->priv;
if (!dsa_is_user_port(ds, port))
return;
dev->on_ports &= ~(1 << port);
dev->live_ports &= ~(1 << port);
/* port_stp_state_set() will be called after to disable the port so
* there is no need to do anything.
*/
}
EXPORT_SYMBOL_GPL(ksz_disable_port);
struct ksz_device *ksz_switch_alloc(struct device *base, void *priv)
{
struct dsa_switch *ds;
struct ksz_device *swdev;
ds = devm_kzalloc(base, sizeof(*ds), GFP_KERNEL);
if (!ds)
return NULL;
ds->dev = base;
ds->num_ports = DSA_MAX_PORTS;
swdev = devm_kzalloc(base, sizeof(*swdev), GFP_KERNEL);
if (!swdev)
return NULL;
ds->priv = swdev;
swdev->dev = base;
swdev->ds = ds;
swdev->priv = priv;
return swdev;
}
EXPORT_SYMBOL(ksz_switch_alloc);
int ksz_switch_register(struct ksz_device *dev,
const struct ksz_dev_ops *ops)
{
phy_interface_t interface;
int ret;
if (dev->pdata)
dev->chip_id = dev->pdata->chip_id;
dev->reset_gpio = devm_gpiod_get_optional(dev->dev, "reset",
GPIOD_OUT_LOW);
if (IS_ERR(dev->reset_gpio))
return PTR_ERR(dev->reset_gpio);
if (dev->reset_gpio) {
gpiod_set_value_cansleep(dev->reset_gpio, 1);
mdelay(10);
gpiod_set_value_cansleep(dev->reset_gpio, 0);
}
mutex_init(&dev->dev_mutex);
mutex_init(&dev->regmap_mutex);
mutex_init(&dev->alu_mutex);
mutex_init(&dev->vlan_mutex);
dev->dev_ops = ops;
if (dev->dev_ops->detect(dev))
return -EINVAL;
ret = dev->dev_ops->init(dev);
if (ret)
return ret;
/* Host port interface will be self detected, or specifically set in
* device tree.
*/
if (dev->dev->of_node) {
ret = of_get_phy_mode(dev->dev->of_node, &interface);
if (ret == 0)
dev->interface = interface;
dev->synclko_125 = of_property_read_bool(dev->dev->of_node,
"microchip,synclko-125");
}
ret = dsa_register_switch(dev->ds);
if (ret) {
dev->dev_ops->exit(dev);
return ret;
}
return 0;
}
EXPORT_SYMBOL(ksz_switch_register);
void ksz_switch_remove(struct ksz_device *dev)
{
/* timer started */
if (dev->mib_read_interval)
cancel_delayed_work_sync(&dev->mib_read);
dev->dev_ops->exit(dev);
dsa_unregister_switch(dev->ds);
if (dev->reset_gpio)
gpiod_set_value_cansleep(dev->reset_gpio, 1);
}
EXPORT_SYMBOL(ksz_switch_remove);
MODULE_AUTHOR("Woojung Huh <Woojung.Huh@microchip.com>");
MODULE_DESCRIPTION("Microchip KSZ Series Switch DSA Driver");
MODULE_LICENSE("GPL");
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