mdio: Add generic MDIO (clause 45) support functions

These roughly mirror many of the MII library functions and are based on code from the sfc driver. Signed-off-by: Ben Hutchings <bhutchings@solarflare.com> Signed-off-by: David S. Miller <davem@davemloft.net>

mdio: Add generic MDIO (clause 45) support functions
These roughly mirror many of the MII library functions and are based on code from the sfc driver. Signed-off-by: Ben Hutchings <bhutchings@solarflare.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Ben Hutchings · David S. Miller
1 parent 52c94dfae1
Showing 4 changed files with 429 additions and 0 deletions Side-by-side Diff
drivers/net/Kconfig
drivers/net/Makefile
drivers/net/mdio.c
include/linux/mdio.h
@@ -2443,6 +2443,9 @@
  
 if NETDEV_10000
  
+config MDIO
+	tristate
+
 config CHELSIO_T1
         tristate "Chelsio 10Gb Ethernet support"
         depends on PCI
@@ -95,6 +95,7 @@
 #
  
 obj-$(CONFIG_MII) += mii.o
+obj-$(CONFIG_MDIO) += mdio.o
 obj-$(CONFIG_PHYLIB) += phy/
  
 obj-$(CONFIG_SUNDANCE) += sundance.o
+/*
+ * mdio.c: Generic support for MDIO-compatible transceivers
+ * Copyright 2006-2009 Solarflare Communications Inc.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 as published
+ * by the Free Software Foundation, incorporated herein by reference.
+ */
+
+#include <linux/kernel.h>
+#include <linux/capability.h>
+#include <linux/errno.h>
+#include <linux/ethtool.h>
+#include <linux/mdio.h>
+#include <linux/module.h>
+
+/**
+ * mdio45_probe - probe for an MDIO (clause 45) device
+ * @mdio: MDIO interface
+ * @prtad: Expected PHY address
+ *
+ * This sets @prtad and @mmds in the MDIO interface if successful.
+ * Returns 0 on success, negative on error.
+ */
+int mdio45_probe(struct mdio_if_info *mdio, int prtad)
+{
+	int mmd, stat2, devs1, devs2;
+
+	/* Assume PHY must have at least one of PMA/PMD, WIS, PCS, PHY
+	 * XS or DTE XS; give up if none is present. */
+	for (mmd = 1; mmd <= 5; mmd++) {
+		/* Is this MMD present? */
+		stat2 = mdio->mdio_read(mdio->dev, prtad, mmd, MDIO_STAT2);
+		if (stat2 < 0 ||
+		    (stat2 & MDIO_STAT2_DEVPRST) != MDIO_STAT2_DEVPRST_VAL)
+			continue;
+
+		/* It should tell us about all the other MMDs */
+		devs1 = mdio->mdio_read(mdio->dev, prtad, mmd, MDIO_DEVS1);
+		devs2 = mdio->mdio_read(mdio->dev, prtad, mmd, MDIO_DEVS2);
+		if (devs1 < 0 || devs2 < 0)
+			continue;
+
+		mdio->prtad = prtad;
+		mdio->mmds = devs1 | (devs2 << 16);
+		return 0;
+	}
+
+	return -ENODEV;
+}
+EXPORT_SYMBOL(mdio45_probe);
+
+/**
+ * mdio_set_flag - set or clear flag in an MDIO register
+ * @mdio: MDIO interface
+ * @prtad: PHY address
+ * @devad: MMD address
+ * @addr: Register address
+ * @mask: Mask for flag (single bit set)
+ * @sense: New value of flag
+ *
+ * This debounces changes: it does not write the register if the flag
+ * already has the proper value.  Returns 0 on success, negative on error.
+ */
+int mdio_set_flag(const struct mdio_if_info *mdio,
+		  int prtad, int devad, u16 addr, int mask,
+		  bool sense)
+{
+	int old_val = mdio->mdio_read(mdio->dev, prtad, devad, addr);
+	int new_val;
+
+	if (old_val < 0)
+		return old_val;
+	if (sense)
+		new_val = old_val | mask;
+	else
+		new_val = old_val & ~mask;
+	if (old_val == new_val)
+		return 0;
+	return mdio->mdio_write(mdio->dev, prtad, devad, addr, new_val);
+}
+EXPORT_SYMBOL(mdio_set_flag);
+
+/**
+ * mdio_link_ok - is link status up/OK
+ * @mdio: MDIO interface
+ * @mmd_mask: Mask for MMDs to check
+ *
+ * Returns 1 if the PHY reports link status up/OK, 0 otherwise.
+ * @mmd_mask is normally @mdio->mmds, but if loopback is enabled
+ * the MMDs being bypassed should be excluded from the mask.
+ */
+int mdio45_links_ok(const struct mdio_if_info *mdio, u32 mmd_mask)
+{
+	int devad, reg;
+
+	if (!mmd_mask) {
+		/* Use absence of XGMII faults in lieu of link state */
+		reg = mdio->mdio_read(mdio->dev, mdio->prtad,
+				      MDIO_MMD_PHYXS, MDIO_STAT2);
+		return reg >= 0 && !(reg & MDIO_STAT2_RXFAULT);
+	}
+
+	for (devad = 0; mmd_mask; devad++) {
+		if (mmd_mask & (1 << devad)) {
+			mmd_mask &= ~(1 << devad);
+
+			/* Read twice because link state is latched and a
+			 * read moves the current state into the register */
+			mdio->mdio_read(mdio->dev, mdio->prtad,
+					devad, MDIO_STAT1);
+			reg = mdio->mdio_read(mdio->dev, mdio->prtad,
+					      devad, MDIO_STAT1);
+			if (reg < 0 || !(reg & MDIO_STAT1_LSTATUS))
+				return false;
+		}
+	}
+
+	return true;
+}
+EXPORT_SYMBOL(mdio45_links_ok);
+
+/**
+ * mdio45_nway_restart - restart auto-negotiation for this interface
+ * @mdio: MDIO interface
+ *
+ * Returns 0 on success, negative on error.
+ */
+int mdio45_nway_restart(const struct mdio_if_info *mdio)
+{
+	if (!(mdio->mmds & MDIO_DEVS_AN))
+		return -EOPNOTSUPP;
+
+	mdio_set_flag(mdio, mdio->prtad, MDIO_MMD_AN, MDIO_CTRL1,
+		      MDIO_AN_CTRL1_RESTART, true);
+	return 0;
+}
+EXPORT_SYMBOL(mdio45_nway_restart);
+
+static u32 mdio45_get_an(const struct mdio_if_info *mdio, u16 addr)
+{
+	u32 result = 0;
+	int reg;
+
+	reg = mdio->mdio_read(mdio->dev, mdio->prtad, MDIO_MMD_AN, addr);
+	if (reg & ADVERTISE_10HALF)
+		result |= ADVERTISED_10baseT_Half;
+	if (reg & ADVERTISE_10FULL)
+		result |= ADVERTISED_10baseT_Full;
+	if (reg & ADVERTISE_100HALF)
+		result |= ADVERTISED_100baseT_Half;
+	if (reg & ADVERTISE_100FULL)
+		result |= ADVERTISED_100baseT_Full;
+	return result;
+}
+
+/**
+ * mdio45_ethtool_gset_npage - get settings for ETHTOOL_GSET
+ * @mdio: MDIO interface
+ * @ecmd: Ethtool request structure
+ * @npage_adv: Modes currently advertised on next pages
+ * @npage_lpa: Modes advertised by link partner on next pages
+ *
+ * Since the CSRs for auto-negotiation using next pages are not fully
+ * standardised, this function does not attempt to decode them.  The
+ * caller must pass them in.
+ */
+void mdio45_ethtool_gset_npage(const struct mdio_if_info *mdio,
+			       struct ethtool_cmd *ecmd,
+			       u32 npage_adv, u32 npage_lpa)
+{
+	int reg;
+
+	ecmd->transceiver = XCVR_INTERNAL;
+	ecmd->phy_address = mdio->prtad;
+
+	reg = mdio->mdio_read(mdio->dev, mdio->prtad, MDIO_MMD_PMAPMD,
+			      MDIO_CTRL2);
+	switch (reg & MDIO_PMA_CTRL2_TYPE) {
+	case MDIO_PMA_CTRL2_10GBT:
+	case MDIO_PMA_CTRL2_1000BT:
+	case MDIO_PMA_CTRL2_100BTX:
+	case MDIO_PMA_CTRL2_10BT:
+		ecmd->port = PORT_TP;
+		ecmd->supported = SUPPORTED_TP;
+		reg = mdio->mdio_read(mdio->dev, mdio->prtad, MDIO_MMD_PMAPMD,
+				      MDIO_SPEED);
+		if (reg & MDIO_SPEED_10G)
+			ecmd->supported |= SUPPORTED_10000baseT_Full;
+		if (reg & MDIO_PMA_SPEED_1000)
+			ecmd->supported |= (SUPPORTED_1000baseT_Full |
+					    SUPPORTED_1000baseT_Half);
+		if (reg & MDIO_PMA_SPEED_100)
+			ecmd->supported |= (SUPPORTED_100baseT_Full |
+					    SUPPORTED_100baseT_Half);
+		if (reg & MDIO_PMA_SPEED_10)
+			ecmd->supported |= (SUPPORTED_10baseT_Full |
+					    SUPPORTED_10baseT_Half);
+		ecmd->advertising = ADVERTISED_TP;
+		break;
+
+	case MDIO_PMA_CTRL2_10GBCX4:
+	case MDIO_PMA_CTRL2_10GBKX4:
+	case MDIO_PMA_CTRL2_10GBKR:
+	case MDIO_PMA_CTRL2_1000BKX:
+		ecmd->port = PORT_OTHER;
+		ecmd->supported = 0;
+		ecmd->advertising = 0;
+		break;
+
+	/* All the other defined modes are flavours of optical */
+	default:
+		ecmd->port = PORT_FIBRE;
+		ecmd->supported = SUPPORTED_FIBRE;
+		ecmd->advertising = ADVERTISED_FIBRE;
+		break;
+	}
+
+	if (mdio->mmds & MDIO_DEVS_AN) {
+		ecmd->supported |= SUPPORTED_Autoneg;
+		reg = mdio->mdio_read(mdio->dev, mdio->prtad, MDIO_MMD_AN,
+				      MDIO_CTRL1);
+		if (reg & MDIO_AN_CTRL1_ENABLE) {
+			ecmd->autoneg = AUTONEG_ENABLE;
+			ecmd->advertising |=
+				ADVERTISED_Autoneg |
+				mdio45_get_an(mdio, MDIO_AN_ADVERTISE) |
+				npage_adv;
+		} else {
+			ecmd->autoneg = AUTONEG_DISABLE;
+		}
+	} else {
+		ecmd->autoneg = AUTONEG_DISABLE;
+	}
+
+	if (ecmd->autoneg) {
+		u32 modes = 0;
+
+		/* If AN is complete and successful, report best common
+		 * mode, otherwise report best advertised mode. */
+		if (mdio->mdio_read(mdio->dev, mdio->prtad, MDIO_MMD_AN,
+				    MDIO_STAT1) &
+		    MDIO_AN_STAT1_COMPLETE)
+			modes = (ecmd->advertising &
+				 (mdio45_get_an(mdio, MDIO_AN_LPA) |
+				  npage_lpa));
+		if (modes == 0)
+			modes = ecmd->advertising;
+
+		if (modes & ADVERTISED_10000baseT_Full) {
+			ecmd->speed = SPEED_10000;
+			ecmd->duplex = DUPLEX_FULL;
+		} else if (modes & (ADVERTISED_1000baseT_Full |
+				    ADVERTISED_1000baseT_Half)) {
+			ecmd->speed = SPEED_1000;
+			ecmd->duplex = !!(modes & ADVERTISED_1000baseT_Full);
+		} else if (modes & (ADVERTISED_100baseT_Full |
+				    ADVERTISED_100baseT_Half)) {
+			ecmd->speed = SPEED_100;
+			ecmd->duplex = !!(modes & ADVERTISED_100baseT_Full);
+		} else {
+			ecmd->speed = SPEED_10;
+			ecmd->duplex = !!(modes & ADVERTISED_10baseT_Full);
+		}
+	} else {
+		/* Report forced settings */
+		reg = mdio->mdio_read(mdio->dev, mdio->prtad, MDIO_MMD_PMAPMD,
+				      MDIO_CTRL1);
+		ecmd->speed = (((reg & MDIO_PMA_CTRL1_SPEED1000) ? 100 : 1) *
+			       ((reg & MDIO_PMA_CTRL1_SPEED100) ? 100 : 10));
+		ecmd->duplex = (reg & MDIO_CTRL1_FULLDPLX ||
+				ecmd->speed == SPEED_10000);
+	}
+}
+EXPORT_SYMBOL(mdio45_ethtool_gset_npage);
+
+/**
+ * mdio_mii_ioctl - MII ioctl interface for MDIO (clause 22 or 45) PHYs
+ * @mdio: MDIO interface
+ * @mii_data: MII ioctl data structure
+ * @cmd: MII ioctl command
+ *
+ * Returns 0 on success, negative on error.
+ */
+int mdio_mii_ioctl(const struct mdio_if_info *mdio,
+		   struct mii_ioctl_data *mii_data, int cmd)
+{
+	int prtad, devad;
+	u16 addr = mii_data->reg_num;
+
+	/* Validate/convert cmd to one of SIOC{G,S}MIIREG */
+	switch (cmd) {
+	case SIOCGMIIPHY:
+		if (mdio->prtad == MDIO_PRTAD_NONE)
+			return -EOPNOTSUPP;
+		mii_data->phy_id = mdio->prtad;
+		cmd = SIOCGMIIREG;
+		break;
+	case SIOCGMIIREG:
+		break;
+	case SIOCSMIIREG:
+		if (!capable(CAP_NET_ADMIN))
+			return -EPERM;
+		break;
+	default:
+		return -EOPNOTSUPP;
+	}
+
+	/* Validate/convert phy_id */
+	if ((mdio->mode_support & MDIO_SUPPORTS_C45) &&
+	    mdio_phy_id_is_c45(mii_data->phy_id)) {
+		prtad = mdio_phy_id_prtad(mii_data->phy_id);
+		devad = mdio_phy_id_devad(mii_data->phy_id);
+	} else if ((mdio->mode_support & MDIO_SUPPORTS_C22) &&
+		   mii_data->phy_id < 0x20) {
+		prtad = mii_data->phy_id;
+		devad = MDIO_DEVAD_NONE;
+		addr &= 0x1f;
+	} else if ((mdio->mode_support & MDIO_EMULATE_C22) &&
+		   mdio->prtad != MDIO_PRTAD_NONE &&
+		   mii_data->phy_id == mdio->prtad) {
+		/* Remap commonly-used MII registers. */
+		prtad = mdio->prtad;
+		switch (addr) {
+		case MII_BMCR:
+		case MII_BMSR:
+		case MII_PHYSID1:
+		case MII_PHYSID2:
+			devad = __ffs(mdio->mmds);
+			break;
+		case MII_ADVERTISE:
+		case MII_LPA:
+			if (!(mdio->mmds & MDIO_DEVS_AN))
+				return -EINVAL;
+			devad = MDIO_MMD_AN;
+			if (addr == MII_ADVERTISE)
+				addr = MDIO_AN_ADVERTISE;
+			else
+				addr = MDIO_AN_LPA;
+			break;
+		default:
+			return -EINVAL;
+		}
+	} else {
+		return -EINVAL;
+	}
+
+	if (cmd == SIOCGMIIREG) {
+		int rc = mdio->mdio_read(mdio->dev, prtad, devad, addr);
+		if (rc < 0)
+			return rc;
+		mii_data->val_out = rc;
+		return 0;
+	} else {
+		return mdio->mdio_write(mdio->dev, prtad, devad, addr,
+					mii_data->val_in);
+	}
+}
+EXPORT_SYMBOL(mdio_mii_ioctl);
@@ -234,5 +234,71 @@
 	return phy_id & MDIO_PHY_ID_DEVAD;
 }
  
+#ifdef __KERNEL__ 
+
+/**
+ * struct mdio_if_info - Ethernet controller MDIO interface
+ * @prtad: PRTAD of the PHY (%MDIO_PRTAD_NONE if not present/unknown)
+ * @mmds: Mask of MMDs expected to be present in the PHY.  This must be
+ *	non-zero unless @prtad = %MDIO_PRTAD_NONE.
+ * @mode_support: MDIO modes supported.  If %MDIO_SUPPORTS_C22 is set then
+ *	MII register access will be passed through with @devad =
+ *	%MDIO_DEVAD_NONE.  If %MDIO_EMULATE_C22 is set then access to
+ *	commonly used clause 22 registers will be translated into
+ *	clause 45 registers.
+ * @dev: Net device structure
+ * @mdio_read: Register read function; returns value or negative error code
+ * @mdio_write: Register write function; returns 0 or negative error code
+ */
+struct mdio_if_info {
+	int prtad;
+	u32 __bitwise mmds;
+	unsigned mode_support;
+
+	struct net_device *dev;
+	int (*mdio_read)(struct net_device *dev, int prtad, int devad,
+			 u16 addr);
+	int (*mdio_write)(struct net_device *dev, int prtad, int devad,
+			  u16 addr, u16 val);
+};
+
+#define MDIO_PRTAD_NONE			(-1)
+#define MDIO_DEVAD_NONE			(-1)
+#define MDIO_SUPPORTS_C22		1
+#define MDIO_SUPPORTS_C45		2
+#define MDIO_EMULATE_C22		4
+
+struct ethtool_cmd;
+struct ethtool_pauseparam;
+extern int mdio45_probe(struct mdio_if_info *mdio, int prtad);
+extern int mdio_set_flag(const struct mdio_if_info *mdio,
+			 int prtad, int devad, u16 addr, int mask,
+			 bool sense);
+extern int mdio45_links_ok(const struct mdio_if_info *mdio, u32 mmds);
+extern int mdio45_nway_restart(const struct mdio_if_info *mdio);
+extern void mdio45_ethtool_gset_npage(const struct mdio_if_info *mdio,
+				      struct ethtool_cmd *ecmd,
+				      u32 npage_adv, u32 npage_lpa);
+
+/**
+ * mdio45_ethtool_gset - get settings for ETHTOOL_GSET
+ * @mdio: MDIO interface
+ * @ecmd: Ethtool request structure
+ *
+ * Since the CSRs for auto-negotiation using next pages are not fully
+ * standardised, this function does not attempt to decode them.  Use
+ * mdio45_ethtool_gset_npage() to specify advertisement bits from next
+ * pages.
+ */
+static inline void mdio45_ethtool_gset(const struct mdio_if_info *mdio,
+				       struct ethtool_cmd *ecmd)
+{
+	mdio45_ethtool_gset_npage(mdio, ecmd, 0, 0);
+}
+
+extern int mdio_mii_ioctl(const struct mdio_if_info *mdio,
+			  struct mii_ioctl_data *mii_data, int cmd);
+
+#endif /* __KERNEL__ */
 #endif /* __LINUX_MDIO_H__ */
...	...	@@ -2443,6 +2443,9 @@
2443	2443
2444	2444	if NETDEV_10000
2445	2445
	2446	+config MDIO
	2447	+ tristate
	2448	+
2446	2449	config CHELSIO_T1
2447	2450	tristate "Chelsio 10Gb Ethernet support"
2448	2451	depends on PCI
...	...	@@ -95,6 +95,7 @@
95	95	#
96	96
97	97	obj-$(CONFIG_MII) += mii.o
	98	+obj-$(CONFIG_MDIO) += mdio.o
98	99	obj-$(CONFIG_PHYLIB) += phy/
99	100
100	101	obj-$(CONFIG_SUNDANCE) += sundance.o
	1	+/*
	2	+ * mdio.c: Generic support for MDIO-compatible transceivers
	3	+ * Copyright 2006-2009 Solarflare Communications Inc.
	4	+ *
	5	+ * This program is free software; you can redistribute it and/or modify it
	6	+ * under the terms of the GNU General Public License version 2 as published
	7	+ * by the Free Software Foundation, incorporated herein by reference.
	8	+ */
	9	+
	10	+#include <linux/kernel.h>
	11	+#include <linux/capability.h>
	12	+#include <linux/errno.h>
	13	+#include <linux/ethtool.h>
	14	+#include <linux/mdio.h>
	15	+#include <linux/module.h>
	16	+
	17	+/**
	18	+ * mdio45_probe - probe for an MDIO (clause 45) device
	19	+ * @mdio: MDIO interface
	20	+ * @prtad: Expected PHY address
	21	+ *
	22	+ * This sets @prtad and @mmds in the MDIO interface if successful.
	23	+ * Returns 0 on success, negative on error.
	24	+ */
	25	+int mdio45_probe(struct mdio_if_info *mdio, int prtad)
	26	+{
	27	+ int mmd, stat2, devs1, devs2;
	28	+
	29	+ /* Assume PHY must have at least one of PMA/PMD, WIS, PCS, PHY
	30	+ * XS or DTE XS; give up if none is present. */
	31	+ for (mmd = 1; mmd <= 5; mmd++) {
	32	+ /* Is this MMD present? */
	33	+ stat2 = mdio->mdio_read(mdio->dev, prtad, mmd, MDIO_STAT2);
	34	+ if (stat2 < 0 \|\|
	35	+ (stat2 & MDIO_STAT2_DEVPRST) != MDIO_STAT2_DEVPRST_VAL)
	36	+ continue;
	37	+
	38	+ /* It should tell us about all the other MMDs */
	39	+ devs1 = mdio->mdio_read(mdio->dev, prtad, mmd, MDIO_DEVS1);
	40	+ devs2 = mdio->mdio_read(mdio->dev, prtad, mmd, MDIO_DEVS2);
	41	+ if (devs1 < 0 \|\| devs2 < 0)
	42	+ continue;
	43	+
	44	+ mdio->prtad = prtad;
	45	+ mdio->mmds = devs1 \| (devs2 << 16);
	46	+ return 0;
	47	+ }
	48	+
	49	+ return -ENODEV;
	50	+}
	51	+EXPORT_SYMBOL(mdio45_probe);
	52	+
	53	+/**
	54	+ * mdio_set_flag - set or clear flag in an MDIO register
	55	+ * @mdio: MDIO interface
	56	+ * @prtad: PHY address
	57	+ * @devad: MMD address
	58	+ * @addr: Register address
	59	+ * @mask: Mask for flag (single bit set)
	60	+ * @sense: New value of flag
	61	+ *
	62	+ * This debounces changes: it does not write the register if the flag
	63	+ * already has the proper value. Returns 0 on success, negative on error.
	64	+ */
	65	+int mdio_set_flag(const struct mdio_if_info *mdio,
	66	+ int prtad, int devad, u16 addr, int mask,
	67	+ bool sense)
	68	+{
	69	+ int old_val = mdio->mdio_read(mdio->dev, prtad, devad, addr);
	70	+ int new_val;
	71	+
	72	+ if (old_val < 0)
	73	+ return old_val;
	74	+ if (sense)
	75	+ new_val = old_val \| mask;
	76	+ else
	77	+ new_val = old_val & ~mask;
	78	+ if (old_val == new_val)
	79	+ return 0;
	80	+ return mdio->mdio_write(mdio->dev, prtad, devad, addr, new_val);
	81	+}
	82	+EXPORT_SYMBOL(mdio_set_flag);
	83	+
	84	+/**
	85	+ * mdio_link_ok - is link status up/OK
	86	+ * @mdio: MDIO interface
	87	+ * @mmd_mask: Mask for MMDs to check
	88	+ *
	89	+ * Returns 1 if the PHY reports link status up/OK, 0 otherwise.
	90	+ * @mmd_mask is normally @mdio->mmds, but if loopback is enabled
	91	+ * the MMDs being bypassed should be excluded from the mask.
	92	+ */
	93	+int mdio45_links_ok(const struct mdio_if_info *mdio, u32 mmd_mask)
	94	+{
	95	+ int devad, reg;
	96	+
	97	+ if (!mmd_mask) {
	98	+ /* Use absence of XGMII faults in lieu of link state */
	99	+ reg = mdio->mdio_read(mdio->dev, mdio->prtad,
	100	+ MDIO_MMD_PHYXS, MDIO_STAT2);
	101	+ return reg >= 0 && !(reg & MDIO_STAT2_RXFAULT);
	102	+ }
	103	+
	104	+ for (devad = 0; mmd_mask; devad++) {
	105	+ if (mmd_mask & (1 << devad)) {
	106	+ mmd_mask &= ~(1 << devad);
	107	+
	108	+ /* Read twice because link state is latched and a
	109	+ * read moves the current state into the register */
	110	+ mdio->mdio_read(mdio->dev, mdio->prtad,
	111	+ devad, MDIO_STAT1);
	112	+ reg = mdio->mdio_read(mdio->dev, mdio->prtad,
	113	+ devad, MDIO_STAT1);
	114	+ if (reg < 0 \|\| !(reg & MDIO_STAT1_LSTATUS))
	115	+ return false;
	116	+ }
	117	+ }
	118	+
	119	+ return true;
	120	+}
	121	+EXPORT_SYMBOL(mdio45_links_ok);
	122	+
	123	+/**
	124	+ * mdio45_nway_restart - restart auto-negotiation for this interface
	125	+ * @mdio: MDIO interface
	126	+ *
	127	+ * Returns 0 on success, negative on error.
	128	+ */
	129	+int mdio45_nway_restart(const struct mdio_if_info *mdio)
	130	+{
	131	+ if (!(mdio->mmds & MDIO_DEVS_AN))
	132	+ return -EOPNOTSUPP;
	133	+
	134	+ mdio_set_flag(mdio, mdio->prtad, MDIO_MMD_AN, MDIO_CTRL1,
	135	+ MDIO_AN_CTRL1_RESTART, true);
	136	+ return 0;
	137	+}
	138	+EXPORT_SYMBOL(mdio45_nway_restart);
	139	+
	140	+static u32 mdio45_get_an(const struct mdio_if_info *mdio, u16 addr)
	141	+{
	142	+ u32 result = 0;
	143	+ int reg;
	144	+
	145	+ reg = mdio->mdio_read(mdio->dev, mdio->prtad, MDIO_MMD_AN, addr);
	146	+ if (reg & ADVERTISE_10HALF)
	147	+ result \|= ADVERTISED_10baseT_Half;
	148	+ if (reg & ADVERTISE_10FULL)
	149	+ result \|= ADVERTISED_10baseT_Full;
	150	+ if (reg & ADVERTISE_100HALF)
	151	+ result \|= ADVERTISED_100baseT_Half;
	152	+ if (reg & ADVERTISE_100FULL)
	153	+ result \|= ADVERTISED_100baseT_Full;
	154	+ return result;
	155	+}
	156	+
	157	+/**
	158	+ * mdio45_ethtool_gset_npage - get settings for ETHTOOL_GSET
	159	+ * @mdio: MDIO interface
	160	+ * @ecmd: Ethtool request structure
	161	+ * @npage_adv: Modes currently advertised on next pages
	162	+ * @npage_lpa: Modes advertised by link partner on next pages
	163	+ *
	164	+ * Since the CSRs for auto-negotiation using next pages are not fully
	165	+ * standardised, this function does not attempt to decode them. The
	166	+ * caller must pass them in.
	167	+ */
	168	+void mdio45_ethtool_gset_npage(const struct mdio_if_info *mdio,
	169	+ struct ethtool_cmd *ecmd,
	170	+ u32 npage_adv, u32 npage_lpa)
	171	+{
	172	+ int reg;
	173	+
	174	+ ecmd->transceiver = XCVR_INTERNAL;
	175	+ ecmd->phy_address = mdio->prtad;
	176	+
	177	+ reg = mdio->mdio_read(mdio->dev, mdio->prtad, MDIO_MMD_PMAPMD,
	178	+ MDIO_CTRL2);
	179	+ switch (reg & MDIO_PMA_CTRL2_TYPE) {
	180	+ case MDIO_PMA_CTRL2_10GBT:
	181	+ case MDIO_PMA_CTRL2_1000BT:
	182	+ case MDIO_PMA_CTRL2_100BTX:
	183	+ case MDIO_PMA_CTRL2_10BT:
	184	+ ecmd->port = PORT_TP;
	185	+ ecmd->supported = SUPPORTED_TP;
	186	+ reg = mdio->mdio_read(mdio->dev, mdio->prtad, MDIO_MMD_PMAPMD,
	187	+ MDIO_SPEED);
	188	+ if (reg & MDIO_SPEED_10G)
	189	+ ecmd->supported \|= SUPPORTED_10000baseT_Full;
	190	+ if (reg & MDIO_PMA_SPEED_1000)
	191	+ ecmd->supported \|= (SUPPORTED_1000baseT_Full \|
	192	+ SUPPORTED_1000baseT_Half);
	193	+ if (reg & MDIO_PMA_SPEED_100)
	194	+ ecmd->supported \|= (SUPPORTED_100baseT_Full \|
	195	+ SUPPORTED_100baseT_Half);
	196	+ if (reg & MDIO_PMA_SPEED_10)
	197	+ ecmd->supported \|= (SUPPORTED_10baseT_Full \|
	198	+ SUPPORTED_10baseT_Half);
	199	+ ecmd->advertising = ADVERTISED_TP;
	200	+ break;
	201	+
	202	+ case MDIO_PMA_CTRL2_10GBCX4:
	203	+ case MDIO_PMA_CTRL2_10GBKX4:
	204	+ case MDIO_PMA_CTRL2_10GBKR:
	205	+ case MDIO_PMA_CTRL2_1000BKX:
	206	+ ecmd->port = PORT_OTHER;
	207	+ ecmd->supported = 0;
	208	+ ecmd->advertising = 0;
	209	+ break;
	210	+
	211	+ /* All the other defined modes are flavours of optical */
	212	+ default:
	213	+ ecmd->port = PORT_FIBRE;
	214	+ ecmd->supported = SUPPORTED_FIBRE;
	215	+ ecmd->advertising = ADVERTISED_FIBRE;
	216	+ break;
	217	+ }
	218	+
	219	+ if (mdio->mmds & MDIO_DEVS_AN) {
	220	+ ecmd->supported \|= SUPPORTED_Autoneg;
	221	+ reg = mdio->mdio_read(mdio->dev, mdio->prtad, MDIO_MMD_AN,
	222	+ MDIO_CTRL1);
	223	+ if (reg & MDIO_AN_CTRL1_ENABLE) {
	224	+ ecmd->autoneg = AUTONEG_ENABLE;
	225	+ ecmd->advertising \|=
	226	+ ADVERTISED_Autoneg \|
	227	+ mdio45_get_an(mdio, MDIO_AN_ADVERTISE) \|
	228	+ npage_adv;
	229	+ } else {
	230	+ ecmd->autoneg = AUTONEG_DISABLE;
	231	+ }
	232	+ } else {
	233	+ ecmd->autoneg = AUTONEG_DISABLE;
	234	+ }
	235	+
	236	+ if (ecmd->autoneg) {
	237	+ u32 modes = 0;
	238	+
	239	+ /* If AN is complete and successful, report best common
	240	+ * mode, otherwise report best advertised mode. */
	241	+ if (mdio->mdio_read(mdio->dev, mdio->prtad, MDIO_MMD_AN,
	242	+ MDIO_STAT1) &
	243	+ MDIO_AN_STAT1_COMPLETE)
	244	+ modes = (ecmd->advertising &
	245	+ (mdio45_get_an(mdio, MDIO_AN_LPA) \|
	246	+ npage_lpa));
	247	+ if (modes == 0)
	248	+ modes = ecmd->advertising;
	249	+
	250	+ if (modes & ADVERTISED_10000baseT_Full) {
	251	+ ecmd->speed = SPEED_10000;
	252	+ ecmd->duplex = DUPLEX_FULL;
	253	+ } else if (modes & (ADVERTISED_1000baseT_Full \|
	254	+ ADVERTISED_1000baseT_Half)) {
	255	+ ecmd->speed = SPEED_1000;
	256	+ ecmd->duplex = !!(modes & ADVERTISED_1000baseT_Full);
	257	+ } else if (modes & (ADVERTISED_100baseT_Full \|
	258	+ ADVERTISED_100baseT_Half)) {
	259	+ ecmd->speed = SPEED_100;
	260	+ ecmd->duplex = !!(modes & ADVERTISED_100baseT_Full);
	261	+ } else {
	262	+ ecmd->speed = SPEED_10;
	263	+ ecmd->duplex = !!(modes & ADVERTISED_10baseT_Full);
	264	+ }
	265	+ } else {
	266	+ /* Report forced settings */
	267	+ reg = mdio->mdio_read(mdio->dev, mdio->prtad, MDIO_MMD_PMAPMD,
	268	+ MDIO_CTRL1);
	269	+ ecmd->speed = (((reg & MDIO_PMA_CTRL1_SPEED1000) ? 100 : 1) *
	270	+ ((reg & MDIO_PMA_CTRL1_SPEED100) ? 100 : 10));
	271	+ ecmd->duplex = (reg & MDIO_CTRL1_FULLDPLX \|\|
	272	+ ecmd->speed == SPEED_10000);
	273	+ }
	274	+}
	275	+EXPORT_SYMBOL(mdio45_ethtool_gset_npage);
	276	+
	277	+/**
	278	+ * mdio_mii_ioctl - MII ioctl interface for MDIO (clause 22 or 45) PHYs
	279	+ * @mdio: MDIO interface
	280	+ * @mii_data: MII ioctl data structure
	281	+ * @cmd: MII ioctl command
	282	+ *
	283	+ * Returns 0 on success, negative on error.
	284	+ */
	285	+int mdio_mii_ioctl(const struct mdio_if_info *mdio,
	286	+ struct mii_ioctl_data *mii_data, int cmd)
	287	+{
	288	+ int prtad, devad;
	289	+ u16 addr = mii_data->reg_num;
	290	+
	291	+ /* Validate/convert cmd to one of SIOC{G,S}MIIREG */
	292	+ switch (cmd) {
	293	+ case SIOCGMIIPHY:
	294	+ if (mdio->prtad == MDIO_PRTAD_NONE)
	295	+ return -EOPNOTSUPP;
	296	+ mii_data->phy_id = mdio->prtad;
	297	+ cmd = SIOCGMIIREG;
	298	+ break;
	299	+ case SIOCGMIIREG:
	300	+ break;
	301	+ case SIOCSMIIREG:
	302	+ if (!capable(CAP_NET_ADMIN))
	303	+ return -EPERM;
	304	+ break;
	305	+ default:
	306	+ return -EOPNOTSUPP;
	307	+ }
	308	+
	309	+ /* Validate/convert phy_id */
	310	+ if ((mdio->mode_support & MDIO_SUPPORTS_C45) &&
	311	+ mdio_phy_id_is_c45(mii_data->phy_id)) {
	312	+ prtad = mdio_phy_id_prtad(mii_data->phy_id);
	313	+ devad = mdio_phy_id_devad(mii_data->phy_id);
	314	+ } else if ((mdio->mode_support & MDIO_SUPPORTS_C22) &&
	315	+ mii_data->phy_id < 0x20) {
	316	+ prtad = mii_data->phy_id;
	317	+ devad = MDIO_DEVAD_NONE;
	318	+ addr &= 0x1f;
	319	+ } else if ((mdio->mode_support & MDIO_EMULATE_C22) &&
	320	+ mdio->prtad != MDIO_PRTAD_NONE &&
	321	+ mii_data->phy_id == mdio->prtad) {
	322	+ /* Remap commonly-used MII registers. */
	323	+ prtad = mdio->prtad;
	324	+ switch (addr) {
	325	+ case MII_BMCR:
	326	+ case MII_BMSR:
	327	+ case MII_PHYSID1:
	328	+ case MII_PHYSID2:
	329	+ devad = __ffs(mdio->mmds);
	330	+ break;
	331	+ case MII_ADVERTISE:
	332	+ case MII_LPA:
	333	+ if (!(mdio->mmds & MDIO_DEVS_AN))
	334	+ return -EINVAL;
	335	+ devad = MDIO_MMD_AN;
	336	+ if (addr == MII_ADVERTISE)
	337	+ addr = MDIO_AN_ADVERTISE;
	338	+ else
	339	+ addr = MDIO_AN_LPA;
	340	+ break;
	341	+ default:
	342	+ return -EINVAL;
	343	+ }
	344	+ } else {
	345	+ return -EINVAL;
	346	+ }
	347	+
	348	+ if (cmd == SIOCGMIIREG) {
	349	+ int rc = mdio->mdio_read(mdio->dev, prtad, devad, addr);
	350	+ if (rc < 0)
	351	+ return rc;
	352	+ mii_data->val_out = rc;
	353	+ return 0;
	354	+ } else {
	355	+ return mdio->mdio_write(mdio->dev, prtad, devad, addr,
	356	+ mii_data->val_in);
	357	+ }
	358	+}
	359	+EXPORT_SYMBOL(mdio_mii_ioctl);
...	...	@@ -234,5 +234,71 @@
234	234	return phy_id & MDIO_PHY_ID_DEVAD;
235	235	}
236	236
	237	+#ifdef __KERNEL__
	238	+
	239	+/**
	240	+ * struct mdio_if_info - Ethernet controller MDIO interface
	241	+ * @prtad: PRTAD of the PHY (%MDIO_PRTAD_NONE if not present/unknown)
	242	+ * @mmds: Mask of MMDs expected to be present in the PHY. This must be
	243	+ * non-zero unless @prtad = %MDIO_PRTAD_NONE.
	244	+ * @mode_support: MDIO modes supported. If %MDIO_SUPPORTS_C22 is set then
	245	+ * MII register access will be passed through with @devad =
	246	+ * %MDIO_DEVAD_NONE. If %MDIO_EMULATE_C22 is set then access to
	247	+ * commonly used clause 22 registers will be translated into
	248	+ * clause 45 registers.
	249	+ * @dev: Net device structure
	250	+ * @mdio_read: Register read function; returns value or negative error code
	251	+ * @mdio_write: Register write function; returns 0 or negative error code
	252	+ */
	253	+struct mdio_if_info {
	254	+ int prtad;
	255	+ u32 __bitwise mmds;
	256	+ unsigned mode_support;
	257	+
	258	+ struct net_device *dev;
	259	+ int (mdio_read)(struct net_device dev, int prtad, int devad,
	260	+ u16 addr);
	261	+ int (mdio_write)(struct net_device dev, int prtad, int devad,
	262	+ u16 addr, u16 val);
	263	+};
	264	+
	265	+#define MDIO_PRTAD_NONE (-1)
	266	+#define MDIO_DEVAD_NONE (-1)
	267	+#define MDIO_SUPPORTS_C22 1
	268	+#define MDIO_SUPPORTS_C45 2
	269	+#define MDIO_EMULATE_C22 4
	270	+
	271	+struct ethtool_cmd;
	272	+struct ethtool_pauseparam;
	273	+extern int mdio45_probe(struct mdio_if_info *mdio, int prtad);
	274	+extern int mdio_set_flag(const struct mdio_if_info *mdio,
	275	+ int prtad, int devad, u16 addr, int mask,
	276	+ bool sense);
	277	+extern int mdio45_links_ok(const struct mdio_if_info *mdio, u32 mmds);
	278	+extern int mdio45_nway_restart(const struct mdio_if_info *mdio);
	279	+extern void mdio45_ethtool_gset_npage(const struct mdio_if_info *mdio,
	280	+ struct ethtool_cmd *ecmd,
	281	+ u32 npage_adv, u32 npage_lpa);
	282	+
	283	+/**
	284	+ * mdio45_ethtool_gset - get settings for ETHTOOL_GSET
	285	+ * @mdio: MDIO interface
	286	+ * @ecmd: Ethtool request structure
	287	+ *
	288	+ * Since the CSRs for auto-negotiation using next pages are not fully
	289	+ * standardised, this function does not attempt to decode them. Use
	290	+ * mdio45_ethtool_gset_npage() to specify advertisement bits from next
	291	+ * pages.
	292	+ */
	293	+static inline void mdio45_ethtool_gset(const struct mdio_if_info *mdio,
	294	+ struct ethtool_cmd *ecmd)
	295	+{
	296	+ mdio45_ethtool_gset_npage(mdio, ecmd, 0, 0);
	297	+}
	298	+
	299	+extern int mdio_mii_ioctl(const struct mdio_if_info *mdio,
	300	+ struct mii_ioctl_data *mii_data, int cmd);
	301	+
	302	+#endif /* __KERNEL__ */
237	303	#endif /* __LINUX_MDIO_H__ */