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Subject[PATCH net-next v8 1/2] net: phy: Add phy loopback support in net phy framework
Date
This patch add set_loopback in phy_driver, which is used by MAC
driver to enable or disable phy loopback. it also add a generic
genphy_loopback function, which use BMCR loopback bit to enable
or disable loopback.

Signed-off-by: Lin Yun Sheng <linyunsheng@huawei.com>
Reviewed-by: Andrew Lunn <andrew@lunn.ch>
Reviewed-by: Florian Fainelli <f.fainelli@gmail.com>
---
drivers/net/phy/marvell.c | 1 +
drivers/net/phy/phy_device.c | 51 ++++++++++++++++++++++++++++++++++++++++++++
include/linux/phy.h | 5 +++++
3 files changed, 57 insertions(+)

diff --git a/drivers/net/phy/marvell.c b/drivers/net/phy/marvell.c
index 8400403..5d314f1 100644
--- a/drivers/net/phy/marvell.c
+++ b/drivers/net/phy/marvell.c
@@ -2171,6 +2171,7 @@ static int m88e1510_probe(struct phy_device *phydev)
.get_sset_count = marvell_get_sset_count,
.get_strings = marvell_get_strings,
.get_stats = marvell_get_stats,
+ .set_loopback = genphy_loopback,
},
{
.phy_id = MARVELL_PHY_ID_88E1540,
diff --git a/drivers/net/phy/phy_device.c b/drivers/net/phy/phy_device.c
index acf00f0..1790f7f 100644
--- a/drivers/net/phy/phy_device.c
+++ b/drivers/net/phy/phy_device.c
@@ -1136,6 +1136,39 @@ int phy_resume(struct phy_device *phydev)
}
EXPORT_SYMBOL(phy_resume);

+int phy_loopback(struct phy_device *phydev, bool enable)
+{
+ struct phy_driver *phydrv = to_phy_driver(phydev->mdio.dev.driver);
+ int ret = 0;
+
+ mutex_lock(&phydev->lock);
+
+ if (enable && phydev->loopback_enabled) {
+ ret = -EBUSY;
+ goto out;
+ }
+
+ if (!enable && !phydev->loopback_enabled) {
+ ret = -EINVAL;
+ goto out;
+ }
+
+ if (phydev->drv && phydrv->set_loopback)
+ ret = phydrv->set_loopback(phydev, enable);
+ else
+ ret = -EOPNOTSUPP;
+
+ if (ret)
+ goto out;
+
+ phydev->loopback_enabled = enable;
+
+out:
+ mutex_unlock(&phydev->lock);
+ return ret;
+}
+EXPORT_SYMBOL(phy_loopback);
+
/* Generic PHY support and helper functions */

/**
@@ -1584,6 +1617,23 @@ int genphy_resume(struct phy_device *phydev)
}
EXPORT_SYMBOL(genphy_resume);

+int genphy_loopback(struct phy_device *phydev, bool enable)
+{
+ int value;
+
+ value = phy_read(phydev, MII_BMCR);
+ if (value < 0)
+ return value;
+
+ if (enable)
+ value |= BMCR_LOOPBACK;
+ else
+ value &= ~BMCR_LOOPBACK;
+
+ return phy_write(phydev, MII_BMCR, value);
+}
+EXPORT_SYMBOL(genphy_loopback);
+
static int __set_phy_supported(struct phy_device *phydev, u32 max_speed)
{
/* The default values for phydev->supported are provided by the PHY
@@ -1829,6 +1879,7 @@ void phy_drivers_unregister(struct phy_driver *drv, int n)
.read_status = genphy_read_status,
.suspend = genphy_suspend,
.resume = genphy_resume,
+ .set_loopback = genphy_loopback,
};

static int __init phy_init(void)
diff --git a/include/linux/phy.h b/include/linux/phy.h
index 1d8d701..2a9567b 100644
--- a/include/linux/phy.h
+++ b/include/linux/phy.h
@@ -372,6 +372,7 @@ struct phy_c45_device_ids {
* has_fixups: Set to true if this phy has fixups/quirks.
* suspended: Set to true if this phy has been suspended successfully.
* sysfs_links: Internal boolean tracking sysfs symbolic links setup/removal.
+ * loopback_enabled: Set true if this phy has been loopbacked successfully.
* state: state of the PHY for management purposes
* dev_flags: Device-specific flags used by the PHY driver.
* link_timeout: The number of timer firings to wait before the
@@ -409,6 +410,7 @@ struct phy_device {
bool has_fixups;
bool suspended;
bool sysfs_links;
+ bool loopback_enabled;

enum phy_state state;

@@ -648,6 +650,7 @@ struct phy_driver {
int (*set_tunable)(struct phy_device *dev,
struct ethtool_tunable *tuna,
const void *data);
+ int (*set_loopback)(struct phy_device *dev, bool enable);
};
#define to_phy_driver(d) container_of(to_mdio_common_driver(d), \
struct phy_driver, mdiodrv)
@@ -793,6 +796,7 @@ static inline void phy_device_free(struct phy_device *phydev) { }
int phy_init_hw(struct phy_device *phydev);
int phy_suspend(struct phy_device *phydev);
int phy_resume(struct phy_device *phydev);
+int phy_loopback(struct phy_device *phydev, bool enable);
struct phy_device *phy_attach(struct net_device *dev, const char *bus_id,
phy_interface_t interface);
struct phy_device *phy_find_first(struct mii_bus *bus);
@@ -847,6 +851,7 @@ void phy_attached_print(struct phy_device *phydev, const char *fmt, ...)
int genphy_read_status(struct phy_device *phydev);
int genphy_suspend(struct phy_device *phydev);
int genphy_resume(struct phy_device *phydev);
+int genphy_loopback(struct phy_device *phydev, bool enable);
int genphy_soft_reset(struct phy_device *phydev);
static inline int genphy_no_soft_reset(struct phy_device *phydev)
{
--
1.9.1
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