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acrn-kernel/net/dsa/dsa.c

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/*
* net/dsa/dsa.c - Hardware switch handling
* Copyright (c) 2008-2009 Marvell Semiconductor
* Copyright (c) 2013 Florian Fainelli <florian@openwrt.org>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*/
#include <linux/ctype.h>
#include <linux/device.h>
#include <linux/hwmon.h>
#include <linux/list.h>
#include <linux/platform_device.h>
#include <linux/slab.h>
#include <linux/module.h>
#include <net/dsa.h>
#include <linux/of.h>
#include <linux/of_mdio.h>
#include <linux/of_platform.h>
#include <linux/sysfs.h>
#include "dsa_priv.h"
char dsa_driver_version[] = "0.1";
/* switch driver registration ***********************************************/
static DEFINE_MUTEX(dsa_switch_drivers_mutex);
static LIST_HEAD(dsa_switch_drivers);
void register_switch_driver(struct dsa_switch_driver *drv)
{
mutex_lock(&dsa_switch_drivers_mutex);
list_add_tail(&drv->list, &dsa_switch_drivers);
mutex_unlock(&dsa_switch_drivers_mutex);
}
EXPORT_SYMBOL_GPL(register_switch_driver);
void unregister_switch_driver(struct dsa_switch_driver *drv)
{
mutex_lock(&dsa_switch_drivers_mutex);
list_del_init(&drv->list);
mutex_unlock(&dsa_switch_drivers_mutex);
}
EXPORT_SYMBOL_GPL(unregister_switch_driver);
static struct dsa_switch_driver *
dsa_switch_probe(struct device *host_dev, int sw_addr, char **_name)
{
struct dsa_switch_driver *ret;
struct list_head *list;
char *name;
ret = NULL;
name = NULL;
mutex_lock(&dsa_switch_drivers_mutex);
list_for_each(list, &dsa_switch_drivers) {
struct dsa_switch_driver *drv;
drv = list_entry(list, struct dsa_switch_driver, list);
name = drv->probe(host_dev, sw_addr);
if (name != NULL) {
ret = drv;
break;
}
}
mutex_unlock(&dsa_switch_drivers_mutex);
*_name = name;
return ret;
}
/* hwmon support ************************************************************/
#ifdef CONFIG_NET_DSA_HWMON
static ssize_t temp1_input_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
struct dsa_switch *ds = dev_get_drvdata(dev);
int temp, ret;
ret = ds->drv->get_temp(ds, &temp);
if (ret < 0)
return ret;
return sprintf(buf, "%d\n", temp * 1000);
}
static DEVICE_ATTR_RO(temp1_input);
static ssize_t temp1_max_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
struct dsa_switch *ds = dev_get_drvdata(dev);
int temp, ret;
ret = ds->drv->get_temp_limit(ds, &temp);
if (ret < 0)
return ret;
return sprintf(buf, "%d\n", temp * 1000);
}
static ssize_t temp1_max_store(struct device *dev,
struct device_attribute *attr, const char *buf,
size_t count)
{
struct dsa_switch *ds = dev_get_drvdata(dev);
int temp, ret;
ret = kstrtoint(buf, 0, &temp);
if (ret < 0)
return ret;
ret = ds->drv->set_temp_limit(ds, DIV_ROUND_CLOSEST(temp, 1000));
if (ret < 0)
return ret;
return count;
}
static DEVICE_ATTR(temp1_max, S_IRUGO, temp1_max_show, temp1_max_store);
static ssize_t temp1_max_alarm_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
struct dsa_switch *ds = dev_get_drvdata(dev);
bool alarm;
int ret;
ret = ds->drv->get_temp_alarm(ds, &alarm);
if (ret < 0)
return ret;
return sprintf(buf, "%d\n", alarm);
}
static DEVICE_ATTR_RO(temp1_max_alarm);
static struct attribute *dsa_hwmon_attrs[] = {
&dev_attr_temp1_input.attr, /* 0 */
&dev_attr_temp1_max.attr, /* 1 */
&dev_attr_temp1_max_alarm.attr, /* 2 */
NULL
};
static umode_t dsa_hwmon_attrs_visible(struct kobject *kobj,
struct attribute *attr, int index)
{
struct device *dev = container_of(kobj, struct device, kobj);
struct dsa_switch *ds = dev_get_drvdata(dev);
struct dsa_switch_driver *drv = ds->drv;
umode_t mode = attr->mode;
if (index == 1) {
if (!drv->get_temp_limit)
mode = 0;
else if (drv->set_temp_limit)
mode |= S_IWUSR;
} else if (index == 2 && !drv->get_temp_alarm) {
mode = 0;
}
return mode;
}
static const struct attribute_group dsa_hwmon_group = {
.attrs = dsa_hwmon_attrs,
.is_visible = dsa_hwmon_attrs_visible,
};
__ATTRIBUTE_GROUPS(dsa_hwmon);
#endif /* CONFIG_NET_DSA_HWMON */
/* basic switch operations **************************************************/
static struct dsa_switch *
dsa_switch_setup(struct dsa_switch_tree *dst, int index,
struct device *parent, struct device *host_dev)
{
struct dsa_chip_data *pd = dst->pd->chip + index;
struct dsa_switch_driver *drv;
struct dsa_switch *ds;
int ret;
char *name;
int i;
bool valid_name_found = false;
/*
* Probe for switch model.
*/
drv = dsa_switch_probe(host_dev, pd->sw_addr, &name);
if (drv == NULL) {
netdev_err(dst->master_netdev, "[%d]: could not detect attached switch\n",
index);
return ERR_PTR(-EINVAL);
}
netdev_info(dst->master_netdev, "[%d]: detected a %s switch\n",
index, name);
/*
* Allocate and initialise switch state.
*/
ds = kzalloc(sizeof(*ds) + drv->priv_size, GFP_KERNEL);
if (ds == NULL)
return ERR_PTR(-ENOMEM);
ds->dst = dst;
ds->index = index;
ds->pd = dst->pd->chip + index;
ds->drv = drv;
ds->master_dev = host_dev;
/*
* Validate supplied switch configuration.
*/
for (i = 0; i < DSA_MAX_PORTS; i++) {
char *name;
name = pd->port_names[i];
if (name == NULL)
continue;
if (!strcmp(name, "cpu")) {
if (dst->cpu_switch != -1) {
netdev_err(dst->master_netdev,
"multiple cpu ports?!\n");
ret = -EINVAL;
goto out;
}
dst->cpu_switch = index;
dst->cpu_port = i;
} else if (!strcmp(name, "dsa")) {
ds->dsa_port_mask |= 1 << i;
} else {
ds->phys_port_mask |= 1 << i;
}
valid_name_found = true;
}
if (!valid_name_found && i == DSA_MAX_PORTS) {
ret = -EINVAL;
goto out;
}
/* Make the built-in MII bus mask match the number of ports,
* switch drivers can override this later
*/
ds->phys_mii_mask = ds->phys_port_mask;
/*
* If the CPU connects to this switch, set the switch tree
* tagging protocol to the preferred tagging format of this
* switch.
*/
if (dst->cpu_switch == index) {
switch (drv->tag_protocol) {
#ifdef CONFIG_NET_DSA_TAG_DSA
case DSA_TAG_PROTO_DSA:
dst->rcv = dsa_netdev_ops.rcv;
break;
#endif
#ifdef CONFIG_NET_DSA_TAG_EDSA
case DSA_TAG_PROTO_EDSA:
dst->rcv = edsa_netdev_ops.rcv;
break;
#endif
#ifdef CONFIG_NET_DSA_TAG_TRAILER
case DSA_TAG_PROTO_TRAILER:
dst->rcv = trailer_netdev_ops.rcv;
break;
#endif
#ifdef CONFIG_NET_DSA_TAG_BRCM
case DSA_TAG_PROTO_BRCM:
dst->rcv = brcm_netdev_ops.rcv;
break;
#endif
case DSA_TAG_PROTO_NONE:
break;
default:
ret = -ENOPROTOOPT;
goto out;
}
dst->tag_protocol = drv->tag_protocol;
}
/*
* Do basic register setup.
*/
ret = drv->setup(ds);
if (ret < 0)
goto out;
ret = drv->set_addr(ds, dst->master_netdev->dev_addr);
if (ret < 0)
goto out;
ds->slave_mii_bus = mdiobus_alloc();
if (ds->slave_mii_bus == NULL) {
ret = -ENOMEM;
goto out;
}
dsa_slave_mii_bus_init(ds);
ret = mdiobus_register(ds->slave_mii_bus);
if (ret < 0)
goto out_free;
/*
* Create network devices for physical switch ports.
*/
for (i = 0; i < DSA_MAX_PORTS; i++) {
struct net_device *slave_dev;
if (!(ds->phys_port_mask & (1 << i)))
continue;
slave_dev = dsa_slave_create(ds, parent, i, pd->port_names[i]);
if (slave_dev == NULL) {
netdev_err(dst->master_netdev, "[%d]: can't create dsa slave device for port %d(%s)\n",
index, i, pd->port_names[i]);
continue;
}
ds->ports[i] = slave_dev;
}
#ifdef CONFIG_NET_DSA_HWMON
/* If the switch provides a temperature sensor,
* register with hardware monitoring subsystem.
* Treat registration error as non-fatal and ignore it.
*/
if (drv->get_temp) {
const char *netname = netdev_name(dst->master_netdev);
char hname[IFNAMSIZ + 1];
int i, j;
/* Create valid hwmon 'name' attribute */
for (i = j = 0; i < IFNAMSIZ && netname[i]; i++) {
if (isalnum(netname[i]))
hname[j++] = netname[i];
}
hname[j] = '\0';
scnprintf(ds->hwmon_name, sizeof(ds->hwmon_name), "%s_dsa%d",
hname, index);
ds->hwmon_dev = hwmon_device_register_with_groups(NULL,
ds->hwmon_name, ds, dsa_hwmon_groups);
if (IS_ERR(ds->hwmon_dev))
ds->hwmon_dev = NULL;
}
#endif /* CONFIG_NET_DSA_HWMON */
return ds;
out_free:
mdiobus_free(ds->slave_mii_bus);
out:
kfree(ds);
return ERR_PTR(ret);
}
static void dsa_switch_destroy(struct dsa_switch *ds)
{
#ifdef CONFIG_NET_DSA_HWMON
if (ds->hwmon_dev)
hwmon_device_unregister(ds->hwmon_dev);
#endif
}
#ifdef CONFIG_PM_SLEEP
static int dsa_switch_suspend(struct dsa_switch *ds)
{
int i, ret = 0;
/* Suspend slave network devices */
for (i = 0; i < DSA_MAX_PORTS; i++) {
if (!(ds->phys_port_mask & (1 << i)))
continue;
ret = dsa_slave_suspend(ds->ports[i]);
if (ret)
return ret;
}
if (ds->drv->suspend)
ret = ds->drv->suspend(ds);
return ret;
}
static int dsa_switch_resume(struct dsa_switch *ds)
{
int i, ret = 0;
if (ds->drv->resume)
ret = ds->drv->resume(ds);
if (ret)
return ret;
/* Resume slave network devices */
for (i = 0; i < DSA_MAX_PORTS; i++) {
if (!(ds->phys_port_mask & (1 << i)))
continue;
ret = dsa_slave_resume(ds->ports[i]);
if (ret)
return ret;
}
return 0;
}
#endif
/* link polling *************************************************************/
static void dsa_link_poll_work(struct work_struct *ugly)
{
struct dsa_switch_tree *dst;
int i;
dst = container_of(ugly, struct dsa_switch_tree, link_poll_work);
for (i = 0; i < dst->pd->nr_chips; i++) {
struct dsa_switch *ds = dst->ds[i];
if (ds != NULL && ds->drv->poll_link != NULL)
ds->drv->poll_link(ds);
}
mod_timer(&dst->link_poll_timer, round_jiffies(jiffies + HZ));
}
static void dsa_link_poll_timer(unsigned long _dst)
{
struct dsa_switch_tree *dst = (void *)_dst;
schedule_work(&dst->link_poll_work);
}
/* platform driver init and cleanup *****************************************/
static int dev_is_class(struct device *dev, void *class)
{
if (dev->class != NULL && !strcmp(dev->class->name, class))
return 1;
return 0;
}
static struct device *dev_find_class(struct device *parent, char *class)
{
if (dev_is_class(parent, class)) {
get_device(parent);
return parent;
}
return device_find_child(parent, class, dev_is_class);
}
struct mii_bus *dsa_host_dev_to_mii_bus(struct device *dev)
{
struct device *d;
d = dev_find_class(dev, "mdio_bus");
if (d != NULL) {
struct mii_bus *bus;
bus = to_mii_bus(d);
put_device(d);
return bus;
}
return NULL;
}
EXPORT_SYMBOL_GPL(dsa_host_dev_to_mii_bus);
static struct net_device *dev_to_net_device(struct device *dev)
{
struct device *d;
d = dev_find_class(dev, "net");
if (d != NULL) {
struct net_device *nd;
nd = to_net_dev(d);
dev_hold(nd);
put_device(d);
return nd;
}
return NULL;
}
#ifdef CONFIG_OF
static int dsa_of_setup_routing_table(struct dsa_platform_data *pd,
struct dsa_chip_data *cd,
int chip_index,
struct device_node *link)
{
int ret;
const __be32 *reg;
int link_port_addr;
int link_sw_addr;
struct device_node *parent_sw;
int len;
parent_sw = of_get_parent(link);
if (!parent_sw)
return -EINVAL;
reg = of_get_property(parent_sw, "reg", &len);
if (!reg || (len != sizeof(*reg) * 2))
return -EINVAL;
link_sw_addr = be32_to_cpup(reg + 1);
if (link_sw_addr >= pd->nr_chips)
return -EINVAL;
/* First time routing table allocation */
if (!cd->rtable) {
cd->rtable = kmalloc_array(pd->nr_chips, sizeof(s8),
GFP_KERNEL);
if (!cd->rtable)
return -ENOMEM;
/* default to no valid uplink/downlink */
memset(cd->rtable, -1, pd->nr_chips * sizeof(s8));
}
reg = of_get_property(link, "reg", NULL);
if (!reg) {
ret = -EINVAL;
goto out;
}
link_port_addr = be32_to_cpup(reg);
cd->rtable[link_sw_addr] = link_port_addr;
return 0;
out:
kfree(cd->rtable);
return ret;
}
static void dsa_of_free_platform_data(struct dsa_platform_data *pd)
{
int i;
int port_index;
for (i = 0; i < pd->nr_chips; i++) {
port_index = 0;
while (port_index < DSA_MAX_PORTS) {
kfree(pd->chip[i].port_names[port_index]);
port_index++;
}
kfree(pd->chip[i].rtable);
}
kfree(pd->chip);
}
static int dsa_of_probe(struct platform_device *pdev)
{
struct device_node *np = pdev->dev.of_node;
struct device_node *child, *mdio, *ethernet, *port, *link;
struct mii_bus *mdio_bus;
struct platform_device *ethernet_dev;
struct dsa_platform_data *pd;
struct dsa_chip_data *cd;
const char *port_name;
int chip_index, port_index;
const unsigned int *sw_addr, *port_reg;
u32 eeprom_len;
int ret;
mdio = of_parse_phandle(np, "dsa,mii-bus", 0);
if (!mdio)
return -EINVAL;
mdio_bus = of_mdio_find_bus(mdio);
if (!mdio_bus)
return -EINVAL;
ethernet = of_parse_phandle(np, "dsa,ethernet", 0);
if (!ethernet)
return -EINVAL;
ethernet_dev = of_find_device_by_node(ethernet);
if (!ethernet_dev)
return -ENODEV;
pd = kzalloc(sizeof(*pd), GFP_KERNEL);
if (!pd)
return -ENOMEM;
pdev->dev.platform_data = pd;
pd->netdev = &ethernet_dev->dev;
pd->nr_chips = of_get_child_count(np);
if (pd->nr_chips > DSA_MAX_SWITCHES)
pd->nr_chips = DSA_MAX_SWITCHES;
pd->chip = kcalloc(pd->nr_chips, sizeof(struct dsa_chip_data),
GFP_KERNEL);
if (!pd->chip) {
ret = -ENOMEM;
goto out_free;
}
chip_index = -1;
for_each_available_child_of_node(np, child) {
chip_index++;
cd = &pd->chip[chip_index];
cd->of_node = child;
cd->host_dev = &mdio_bus->dev;
sw_addr = of_get_property(child, "reg", NULL);
if (!sw_addr)
continue;
cd->sw_addr = be32_to_cpup(sw_addr);
if (cd->sw_addr > PHY_MAX_ADDR)
continue;
if (!of_property_read_u32(np, "eeprom-length", &eeprom_len))
cd->eeprom_len = eeprom_len;
for_each_available_child_of_node(child, port) {
port_reg = of_get_property(port, "reg", NULL);
if (!port_reg)
continue;
port_index = be32_to_cpup(port_reg);
port_name = of_get_property(port, "label", NULL);
if (!port_name)
continue;
cd->port_dn[port_index] = port;
cd->port_names[port_index] = kstrdup(port_name,
GFP_KERNEL);
if (!cd->port_names[port_index]) {
ret = -ENOMEM;
goto out_free_chip;
}
link = of_parse_phandle(port, "link", 0);
if (!strcmp(port_name, "dsa") && link &&
pd->nr_chips > 1) {
ret = dsa_of_setup_routing_table(pd, cd,
chip_index, link);
if (ret)
goto out_free_chip;
}
if (port_index == DSA_MAX_PORTS)
break;
}
}
return 0;
out_free_chip:
dsa_of_free_platform_data(pd);
out_free:
kfree(pd);
pdev->dev.platform_data = NULL;
return ret;
}
static void dsa_of_remove(struct platform_device *pdev)
{
struct dsa_platform_data *pd = pdev->dev.platform_data;
if (!pdev->dev.of_node)
return;
dsa_of_free_platform_data(pd);
kfree(pd);
}
#else
static inline int dsa_of_probe(struct platform_device *pdev)
{
return 0;
}
static inline void dsa_of_remove(struct platform_device *pdev)
{
}
#endif
static int dsa_probe(struct platform_device *pdev)
{
struct dsa_platform_data *pd = pdev->dev.platform_data;
struct net_device *dev;
struct dsa_switch_tree *dst;
int i, ret;
pr_notice_once("Distributed Switch Architecture driver version %s\n",
dsa_driver_version);
if (pdev->dev.of_node) {
ret = dsa_of_probe(pdev);
if (ret)
return ret;
pd = pdev->dev.platform_data;
}
if (pd == NULL || pd->netdev == NULL)
return -EINVAL;
dev = dev_to_net_device(pd->netdev);
if (dev == NULL) {
ret = -EINVAL;
goto out;
}
if (dev->dsa_ptr != NULL) {
dev_put(dev);
ret = -EEXIST;
goto out;
}
dst = kzalloc(sizeof(*dst), GFP_KERNEL);
if (dst == NULL) {
dev_put(dev);
ret = -ENOMEM;
goto out;
}
platform_set_drvdata(pdev, dst);
dst->pd = pd;
dst->master_netdev = dev;
dst->cpu_switch = -1;
dst->cpu_port = -1;
for (i = 0; i < pd->nr_chips; i++) {
struct dsa_switch *ds;
ds = dsa_switch_setup(dst, i, &pdev->dev, pd->chip[i].host_dev);
if (IS_ERR(ds)) {
netdev_err(dev, "[%d]: couldn't create dsa switch instance (error %ld)\n",
i, PTR_ERR(ds));
continue;
}
dst->ds[i] = ds;
if (ds->drv->poll_link != NULL)
dst->link_poll_needed = 1;
}
/*
* If we use a tagging format that doesn't have an ethertype
* field, make sure that all packets from this point on get
* sent to the tag format's receive function.
*/
wmb();
dev->dsa_ptr = (void *)dst;
if (dst->link_poll_needed) {
INIT_WORK(&dst->link_poll_work, dsa_link_poll_work);
init_timer(&dst->link_poll_timer);
dst->link_poll_timer.data = (unsigned long)dst;
dst->link_poll_timer.function = dsa_link_poll_timer;
dst->link_poll_timer.expires = round_jiffies(jiffies + HZ);
add_timer(&dst->link_poll_timer);
}
return 0;
out:
dsa_of_remove(pdev);
return ret;
}
static int dsa_remove(struct platform_device *pdev)
{
struct dsa_switch_tree *dst = platform_get_drvdata(pdev);
int i;
if (dst->link_poll_needed)
del_timer_sync(&dst->link_poll_timer);
flush_work(&dst->link_poll_work);
for (i = 0; i < dst->pd->nr_chips; i++) {
struct dsa_switch *ds = dst->ds[i];
if (ds != NULL)
dsa_switch_destroy(ds);
}
dsa_of_remove(pdev);
return 0;
}
static void dsa_shutdown(struct platform_device *pdev)
{
}
static int dsa_switch_rcv(struct sk_buff *skb, struct net_device *dev,
struct packet_type *pt, struct net_device *orig_dev)
{
struct dsa_switch_tree *dst = dev->dsa_ptr;
if (unlikely(dst == NULL)) {
kfree_skb(skb);
return 0;
}
return dst->rcv(skb, dev, pt, orig_dev);
}
static struct packet_type dsa_pack_type __read_mostly = {
.type = cpu_to_be16(ETH_P_XDSA),
.func = dsa_switch_rcv,
};
#ifdef CONFIG_PM_SLEEP
static int dsa_suspend(struct device *d)
{
struct platform_device *pdev = to_platform_device(d);
struct dsa_switch_tree *dst = platform_get_drvdata(pdev);
int i, ret = 0;
for (i = 0; i < dst->pd->nr_chips; i++) {
struct dsa_switch *ds = dst->ds[i];
if (ds != NULL)
ret = dsa_switch_suspend(ds);
}
return ret;
}
static int dsa_resume(struct device *d)
{
struct platform_device *pdev = to_platform_device(d);
struct dsa_switch_tree *dst = platform_get_drvdata(pdev);
int i, ret = 0;
for (i = 0; i < dst->pd->nr_chips; i++) {
struct dsa_switch *ds = dst->ds[i];
if (ds != NULL)
ret = dsa_switch_resume(ds);
}
return ret;
}
#endif
static SIMPLE_DEV_PM_OPS(dsa_pm_ops, dsa_suspend, dsa_resume);
static const struct of_device_id dsa_of_match_table[] = {
{ .compatible = "brcm,bcm7445-switch-v4.0" },
{ .compatible = "marvell,dsa", },
{}
};
MODULE_DEVICE_TABLE(of, dsa_of_match_table);
static struct platform_driver dsa_driver = {
.probe = dsa_probe,
.remove = dsa_remove,
.shutdown = dsa_shutdown,
.driver = {
.name = "dsa",
.of_match_table = dsa_of_match_table,
.pm = &dsa_pm_ops,
},
};
static int __init dsa_init_module(void)
{
int rc;
rc = platform_driver_register(&dsa_driver);
if (rc)
return rc;
dev_add_pack(&dsa_pack_type);
return 0;
}
module_init(dsa_init_module);
static void __exit dsa_cleanup_module(void)
{
dev_remove_pack(&dsa_pack_type);
platform_driver_unregister(&dsa_driver);
}
module_exit(dsa_cleanup_module);
MODULE_AUTHOR("Lennert Buytenhek <buytenh@wantstofly.org>");
MODULE_DESCRIPTION("Driver for Distributed Switch Architecture switch chips");
MODULE_LICENSE("GPL");
MODULE_ALIAS("platform:dsa");
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