Commit a3bdfce7 authored by Heiner Kallweit's avatar Heiner Kallweit Committed by David S. Miller
Browse files

net: phy: marvell: support downshift as PHY tunable 



So far downshift is implemented for one small use case only and can't
be controlled from userspace. So let's implement this feature properly
as a PHY tunable so that it can be controlled via ethtool.
More Marvell PHY's may support downshift, but I restricted it for now
to the ones where I have the datasheet.

Signed-off-by: default avatarHeiner Kallweit <hkallweit1@gmail.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent a8fad545

drivers/net/phy/marvell.c

+87 −1
Original line number Diff line number Diff line
@@ -54,11 +54,15 @@ 
#define MII_M1011_PHY_SCR			0x10

#define MII_M1011_PHY_SCR_DOWNSHIFT_EN		BIT(11)

#define MII_M1011_PHY_SCR_DOWNSHIFT_SHIFT	12

#define MII_M1011_PHY_SRC_DOWNSHIFT_MASK	0x7800

#define MII_M1011_PHY_SRC_DOWNSHIFT_MASK	GENMASK(14, 12)

#define MII_M1011_PHY_SCR_DOWNSHIFT_MAX		8

#define MII_M1011_PHY_SCR_MDI			(0x0 << 5)

#define MII_M1011_PHY_SCR_MDI_X			(0x1 << 5)

#define MII_M1011_PHY_SCR_AUTO_CROSS		(0x3 << 5)



#define MII_M1011_PHY_SSR			0x11

#define MII_M1011_PHY_SSR_DOWNSHIFT		BIT(5)



#define MII_M1111_PHY_LED_CONTROL	0x18

#define MII_M1111_PHY_LED_DIRECT	0x4100

#define MII_M1111_PHY_LED_COMBINE	0x411c
@@ -833,6 +837,79 @@ static int m88e1111_config_init(struct phy_device *phydev) 
	return genphy_soft_reset(phydev);

}



static int m88e1111_get_downshift(struct phy_device *phydev, u8 *data)

{

	int val, cnt, enable;



	val = phy_read(phydev, MII_M1011_PHY_SCR);

	if (val < 0)

		return val;



	enable = FIELD_GET(MII_M1011_PHY_SCR_DOWNSHIFT_EN, val);

	cnt = FIELD_GET(MII_M1011_PHY_SRC_DOWNSHIFT_MASK, val) + 1;



	*data = enable ? cnt : DOWNSHIFT_DEV_DISABLE;



	return 0;

}



static int m88e1111_set_downshift(struct phy_device *phydev, u8 cnt)

{

	int val;



	if (cnt > MII_M1011_PHY_SCR_DOWNSHIFT_MAX)

		return -E2BIG;



	if (!cnt)

		return phy_clear_bits(phydev, MII_M1011_PHY_SCR,

				      MII_M1011_PHY_SCR_DOWNSHIFT_EN);



	val = MII_M1011_PHY_SCR_DOWNSHIFT_EN;

	val |= FIELD_PREP(MII_M1011_PHY_SRC_DOWNSHIFT_MASK, cnt - 1);



	return phy_modify(phydev, MII_M1011_PHY_SCR,

			  MII_M1011_PHY_SCR_DOWNSHIFT_EN |

			  MII_M1011_PHY_SRC_DOWNSHIFT_MASK,

			  val);

}



static int m88e1111_get_tunable(struct phy_device *phydev,

				struct ethtool_tunable *tuna, void *data)

{

	switch (tuna->id) {

	case ETHTOOL_PHY_DOWNSHIFT:

		return m88e1111_get_downshift(phydev, data);

	default:

		return -EOPNOTSUPP;

	}

}



static int m88e1111_set_tunable(struct phy_device *phydev,

				struct ethtool_tunable *tuna, const void *data)

{

	switch (tuna->id) {

	case ETHTOOL_PHY_DOWNSHIFT:

		return m88e1111_set_downshift(phydev, *(const u8 *)data);

	default:

		return -EOPNOTSUPP;

	}

}



static void m88e1111_link_change_notify(struct phy_device *phydev)

{

	int status;



	if (phydev->state != PHY_RUNNING)

		return;



	/* we may be on fiber page currently */

	status = phy_read_paged(phydev, MII_MARVELL_COPPER_PAGE,

				MII_M1011_PHY_SSR);



	if (status > 0 && status & MII_M1011_PHY_SSR_DOWNSHIFT)

		phydev_warn(phydev, "Downshift occurred! Cabling may be defective.\n");

}



static int m88e1318_config_init(struct phy_device *phydev)

{

	if (phy_interrupt_is_valid(phydev)) {
@@ -1117,6 +1194,8 @@ static int m88e1540_get_tunable(struct phy_device *phydev, 
	switch (tuna->id) {

	case ETHTOOL_PHY_FAST_LINK_DOWN:

		return m88e1540_get_fld(phydev, data);

	case ETHTOOL_PHY_DOWNSHIFT:

		return m88e1111_get_downshift(phydev, data);

	default:

		return -EOPNOTSUPP;

	}
@@ -1128,6 +1207,8 @@ static int m88e1540_set_tunable(struct phy_device *phydev, 
	switch (tuna->id) {

	case ETHTOOL_PHY_FAST_LINK_DOWN:

		return m88e1540_set_fld(phydev, data);

	case ETHTOOL_PHY_DOWNSHIFT:

		return m88e1111_set_downshift(phydev, *(const u8 *)data);

	default:

		return -EOPNOTSUPP;

	}
@@ -2220,6 +2301,9 @@ static struct phy_driver marvell_drivers[] = { 
		.get_sset_count = marvell_get_sset_count,

		.get_strings = marvell_get_strings,

		.get_stats = marvell_get_stats,

		.get_tunable = m88e1111_get_tunable,

		.set_tunable = m88e1111_set_tunable,

		.link_change_notify = m88e1111_link_change_notify,

	},

	{

		.phy_id = MARVELL_PHY_ID_88E1318S,
@@ -2359,6 +2443,7 @@ static struct phy_driver marvell_drivers[] = { 
		.get_stats = marvell_get_stats,

		.get_tunable = m88e1540_get_tunable,

		.set_tunable = m88e1540_set_tunable,

		.link_change_notify = m88e1111_link_change_notify,

	},

	{

		.phy_id = MARVELL_PHY_ID_88E1545,
@@ -2421,6 +2506,7 @@ static struct phy_driver marvell_drivers[] = { 
		.get_stats = marvell_get_stats,

		.get_tunable = m88e1540_get_tunable,

		.set_tunable = m88e1540_set_tunable,

		.link_change_notify = m88e1111_link_change_notify,

	},

};

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