phy: add the EEE support and the way to access to the MMD registers.

This patch adds the support for the Energy-Efficient Ethernet (EEE)
to the Physical Abstraction Layer.
To support the EEE we have to access to the MMD registers 3.20 and
7.60/61. So two new functions have been added to read/write the MMD
registers (clause 45).

An Ethernet driver (I tested the stmmac) can invoke the phy_init_eee to properly
check if the EEE is supported by the PHYs and it can also set the clock
stop enable bit in the 3.0 register.
The phy_get_eee_err can be used for reporting the number of time where
the PHY failed to complete its normal wake sequence.

In the end, this patch also adds the EEE ethtool support implementing:
 o phy_ethtool_set_eee
 o phy_ethtool_get_eee

v1: initial patch
v2: fixed some errors especially on naming convention
v3: renamed again the mmd read/write functions thank to Ben's feedback
v4: moved file to phy.c and added the ethtool support.
v5: fixed phy_adv_to_eee, phy_eee_to_supported, phy_eee_to_adv return
    values according to ethtool API (thanks to Ben's feedback).
    Renamed some macros to avoid too long names.
v6: fixed kernel-doc comments to be properly parsed.
    Fixed the phy_init_eee function: we need to check which link mode
    was autonegotiated and then the corresponding bits in 7.60 and 7.61
    registers.
v7: reviewed the way to get the negotiated settings.
v8: fixed a problem in the phy_init_eee return value erroneously added
    when included the phy_read_status call.
v9: do not remove the MDIO_AN_EEE_ADV_100TX and MDIO_AN_EEE_ADV_1000T
    and fixed the eee_{cap,lp,adv} declaration as "int" instead of u16.

Signed-off-by: Giuseppe Cavallaro <peppe.cavallaro@st.com>
Reviewed-by: Ben Hutchings <bhutchings@solarflare.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

3 files changed, 38 insertions, 4 deletions

diff --git a/include/linux/mdio.h b/include/linux/mdio.h
index dfb947959ec9..7cccafe50e7b 100644
--- a/include/linux/mdio.h
+++ b/include/linux/mdio.h
@@ -43,7 +43,11 @@
 #define MDIO_PKGID2		15
 #define MDIO_AN_ADVERTISE	16	/* AN advertising (base page) */
 #define MDIO_AN_LPA		19	/* AN LP abilities (base page) */
+#define MDIO_PCS_EEE_ABLE	20	/* EEE Capability register */
+#define MDIO_PCS_EEE_WK_ERR	22	/* EEE wake error counter */
 #define MDIO_PHYXS_LNSTAT	24	/* PHY XGXS lane state */
+#define MDIO_AN_EEE_ADV		60	/* EEE advertisement */
+#define MDIO_AN_EEE_LPABLE	61	/* EEE link partner ability */
 
 /* Media-dependent registers. */
 #define MDIO_PMA_10GBT_SWAPPOL	130	/* 10GBASE-T pair swap & polarity */
@@ -56,7 +60,6 @@
 #define MDIO_PCS_10GBRT_STAT2	33	/* 10GBASE-R/-T PCS status 2 */
 #define MDIO_AN_10GBT_CTRL	32	/* 10GBASE-T auto-negotiation control */
 #define MDIO_AN_10GBT_STAT	33	/* 10GBASE-T auto-negotiation status */
-#define MDIO_AN_EEE_ADV		60	/* EEE advertisement */
 
 /* LASI (Link Alarm Status Interrupt) registers, defined by XENPAK MSA. */
 #define MDIO_PMA_LASI_RXCTRL	0x9000	/* RX_ALARM control */
@@ -82,6 +85,7 @@
 #define MDIO_AN_CTRL1_RESTART		BMCR_ANRESTART
 #define MDIO_AN_CTRL1_ENABLE		BMCR_ANENABLE
 #define MDIO_AN_CTRL1_XNP		0x2000	/* Enable extended next page */
+#define MDIO_PCS_CTRL1_CLKSTOP_EN	0x400	/* Stop the clock during LPI */
 
 /* 10 Gb/s */
 #define MDIO_CTRL1_SPEED10G		(MDIO_CTRL1_SPEEDSELEXT | 0x00)
@@ -237,9 +241,25 @@
 #define MDIO_AN_10GBT_STAT_MS		0x4000	/* Master/slave config */
 #define MDIO_AN_10GBT_STAT_MSFLT	0x8000	/* Master/slave config fault */
 
-/* AN EEE Advertisement register. */
-#define MDIO_AN_EEE_ADV_100TX		0x0002	/* Advertise 100TX EEE cap */
-#define MDIO_AN_EEE_ADV_1000T		0x0004	/* Advertise 1000T EEE cap */
+/* EEE Supported/Advertisement/LP Advertisement registers.
+ *
+ * EEE capability Register (3.20), Advertisement (7.60) and
+ * Link partner ability (7.61) registers have and can use the same identical
+ * bit masks.
+ */
+#define MDIO_AN_EEE_ADV_100TX	0x0002	/* Advertise 100TX EEE cap */
+#define MDIO_AN_EEE_ADV_1000T	0x0004	/* Advertise 1000T EEE cap */
+/* Note: the two defines above can be potentially used by the user-land
+ * and cannot remove them now.
+ * So, we define the new generic MDIO_EEE_100TX and MDIO_EEE_1000T macros
+ * using the previous ones (that can be considered obsolete).
+ */
+#define MDIO_EEE_100TX		MDIO_AN_EEE_ADV_100TX	/* 100TX EEE cap */
+#define MDIO_EEE_1000T		MDIO_AN_EEE_ADV_1000T	/* 1000T EEE cap */
+#define MDIO_EEE_10GT		0x0008	/* 10GT EEE cap */
+#define MDIO_EEE_1000KX		0x0010	/* 1000KX EEE cap */
+#define MDIO_EEE_10GKX4		0x0020	/* 10G KX4 EEE cap */
+#define MDIO_EEE_10GKR		0x0040	/* 10G KR EEE cap */
 
 /* LASI RX_ALARM control/status registers. */
 #define MDIO_PMA_LASI_RX_PHYXSLFLT	0x0001	/* PHY XS RX local fault */
diff --git a/include/linux/mii.h b/include/linux/mii.h
index 2783eca629a0..8ef3a7a11592 100644
--- a/include/linux/mii.h
+++ b/include/linux/mii.h
@@ -21,6 +21,8 @@
 #define MII_EXPANSION		0x06	/* Expansion register          */
 #define MII_CTRL1000		0x09	/* 1000BASE-T control          */
 #define MII_STAT1000		0x0a	/* 1000BASE-T status           */
+#define	MII_MMD_CTRL		0x0d	/* MMD Access Control Register */
+#define	MII_MMD_DATA		0x0e	/* MMD Access Data Register */
 #define MII_ESTATUS		0x0f	/* Extended Status             */
 #define MII_DCOUNTER		0x12	/* Disconnect counter          */
 #define MII_FCSCOUNTER		0x13	/* False carrier counter       */
@@ -141,6 +143,13 @@
 #define FLOW_CTRL_TX		0x01
 #define FLOW_CTRL_RX		0x02
 
+/* MMD Access Control register fields */
+#define MII_MMD_CTRL_DEVAD_MASK	0x1f	/* Mask MMD DEVAD*/
+#define MII_MMD_CTRL_ADDR	0x0000	/* Address */
+#define MII_MMD_CTRL_NOINCR	0x4000	/* no post increment */
+#define MII_MMD_CTRL_INCR_RDWT	0x8000	/* post increment on reads & writes */
+#define MII_MMD_CTRL_INCR_ON_WT	0xC000	/* post increment on writes only */
+
 /* This structure is used in all SIOCxMIIxxx ioctl calls */
 struct mii_ioctl_data {
 	__u16		phy_id;
diff --git a/include/linux/phy.h b/include/linux/phy.h
index 7eac80a2557b..c35299e4da8e 100644
--- a/include/linux/phy.h
+++ b/include/linux/phy.h
@@ -554,6 +554,11 @@ int phy_register_fixup_for_uid(u32 phy_uid, u32 phy_uid_mask,
 		int (*run)(struct phy_device *));
 int phy_scan_fixups(struct phy_device *phydev);
 
+int phy_init_eee(struct phy_device *phydev, bool clk_stop_enable);
+int phy_get_eee_err(struct phy_device *phydev);
+int phy_ethtool_set_eee(struct phy_device *phydev, struct ethtool_eee *data);
+int phy_ethtool_get_eee(struct phy_device *phydev, struct ethtool_eee *data);
+
 int __init mdio_bus_init(void);
 void mdio_bus_exit(void);