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net: dsa: allow switch drivers to implement suspend/resume hooks

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Add an abstraction layer to suspend/resume switch devices, doing the
following split:

- suspend/resume the slave network devices and their corresponding PHY
  devices
- suspend/resume the switch hardware using switch driver callbacks

Signed-off-by: Florian Fainelli <f.fainelli@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Florian Fainelli 2014-09-18 17:31:22 -07:00 committed by David S. Miller
parent 34f6b8745d
commit 2446254915
4 changed files with 119 additions and 0 deletions
repo.diff.show_diff_stats Download patch file Download diff file Expand all files Collapse all files

6
include/net/dsa.h
View file

@ -210,6 +210,12 @@ struct dsa_switch_driver {
void (*get_ethtool_stats)(struct dsa_switch *ds,
int port, uint64_t *data);
int (*get_sset_count)(struct dsa_switch *ds);
/*
* Suspend and resume
*/
int (*suspend)(struct dsa_switch *ds);
int (*resume)(struct dsa_switch *ds);
};
void register_switch_driver(struct dsa_switch_driver *type);

80
net/dsa/dsa.c
View file

@ -238,6 +238,49 @@ static void dsa_switch_destroy(struct dsa_switch *ds)
{
}
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;
}
/* link polling *************************************************************/
static void dsa_link_poll_work(struct work_struct *ugly)
@ -650,6 +693,42 @@ static struct packet_type dsa_pack_type __read_mostly = {
.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", },
@ -665,6 +744,7 @@ static struct platform_driver dsa_driver = {
.name = "dsa",
.owner = THIS_MODULE,
.of_match_table = dsa_of_match_table,
.pm = &dsa_pm_ops,
},
};

2
net/dsa/dsa_priv.h
View file

@ -56,6 +56,8 @@ void dsa_slave_mii_bus_init(struct dsa_switch *ds);
struct net_device *dsa_slave_create(struct dsa_switch *ds,
struct device *parent,
int port, char *name);
int dsa_slave_suspend(struct net_device *slave_dev);
int dsa_slave_resume(struct net_device *slave_dev);
/* tag_dsa.c */
extern const struct dsa_device_ops dsa_netdev_ops;

31
net/dsa/slave.c
View file

@ -412,6 +412,37 @@ static void dsa_slave_phy_setup(struct dsa_slave_priv *p,
p->phy->addr, p->phy->drv->name);
}
int dsa_slave_suspend(struct net_device *slave_dev)
{
struct dsa_slave_priv *p = netdev_priv(slave_dev);
netif_device_detach(slave_dev);
if (p->phy) {
phy_stop(p->phy);
p->old_pause = -1;
p->old_link = -1;
p->old_duplex = -1;
phy_suspend(p->phy);
}
return 0;
}
int dsa_slave_resume(struct net_device *slave_dev)
{
struct dsa_slave_priv *p = netdev_priv(slave_dev);
netif_device_attach(slave_dev);
if (p->phy) {
phy_resume(p->phy);
phy_start(p->phy);
}
return 0;
}
struct net_device *
dsa_slave_create(struct dsa_switch *ds, struct device *parent,
int port, char *name)