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-rw-r--r--drivers/net/Kconfig3
-rw-r--r--drivers/net/Makefile1
-rw-r--r--drivers/net/mdio.c359
-rw-r--r--include/linux/mdio.h66
4 files changed, 429 insertions, 0 deletions
diff --git a/drivers/net/Kconfig b/drivers/net/Kconfig
index bc7eef12d955..2f81db51b45d 100644
--- a/drivers/net/Kconfig
+++ b/drivers/net/Kconfig
@@ -2443,6 +2443,9 @@ menuconfig NETDEV_10000
if NETDEV_10000
+config MDIO
+ tristate
+
config CHELSIO_T1
tristate "Chelsio 10Gb Ethernet support"
depends on PCI
diff --git a/drivers/net/Makefile b/drivers/net/Makefile
index 80420f6d0795..dcd5f15dd9e3 100644
--- a/drivers/net/Makefile
+++ b/drivers/net/Makefile
@@ -95,6 +95,7 @@ obj-$(CONFIG_SH_ETH) += sh_eth.o
#
obj-$(CONFIG_MII) += mii.o
+obj-$(CONFIG_MDIO) += mdio.o
obj-$(CONFIG_PHYLIB) += phy/
obj-$(CONFIG_SUNDANCE) += sundance.o
diff --git a/drivers/net/mdio.c b/drivers/net/mdio.c
new file mode 100644
index 000000000000..0604a25748ee
--- /dev/null
+++ b/drivers/net/mdio.c
@@ -0,0 +1,359 @@
+/*
+ * 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);
diff --git a/include/linux/mdio.h b/include/linux/mdio.h
index d57ddb08a1b2..ba41537eaa8a 100644
--- a/include/linux/mdio.h
+++ b/include/linux/mdio.h
@@ -234,4 +234,70 @@ static inline __u16 mdio_phy_id_devad(int phy_id)
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__ */
Copyright © 1996 – 2023 Jason A. Donenfeld. All Rights Reverse Engineered.