424 lines
12 KiB
C
424 lines
12 KiB
C
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/*
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* mdio.c: Generic support for MDIO-compatible transceivers
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* Copyright 2006-2009 Solarflare Communications Inc.
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 as published
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* by the Free Software Foundation, incorporated herein by reference.
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*/
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#include <linux/kernel.h>
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#include <linux/capability.h>
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#include <linux/errno.h>
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#include <linux/ethtool.h>
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#include <linux/mdio.h>
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#include <linux/module.h>
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MODULE_DESCRIPTION("Generic support for MDIO-compatible transceivers");
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MODULE_AUTHOR("Copyright 2006-2009 Solarflare Communications Inc.");
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MODULE_LICENSE("GPL");
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/**
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* mdio45_probe - probe for an MDIO (clause 45) device
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* @mdio: MDIO interface
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* @prtad: Expected PHY address
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*
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* This sets @prtad and @mmds in the MDIO interface if successful.
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* Returns 0 on success, negative on error.
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*/
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int mdio45_probe(struct mdio_if_info *mdio, int prtad)
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{
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int mmd, stat2, devs1, devs2;
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/* Assume PHY must have at least one of PMA/PMD, WIS, PCS, PHY
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* XS or DTE XS; give up if none is present. */
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for (mmd = 1; mmd <= 5; mmd++) {
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/* Is this MMD present? */
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stat2 = mdio->mdio_read(mdio->dev, prtad, mmd, MDIO_STAT2);
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if (stat2 < 0 ||
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(stat2 & MDIO_STAT2_DEVPRST) != MDIO_STAT2_DEVPRST_VAL)
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continue;
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/* It should tell us about all the other MMDs */
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devs1 = mdio->mdio_read(mdio->dev, prtad, mmd, MDIO_DEVS1);
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devs2 = mdio->mdio_read(mdio->dev, prtad, mmd, MDIO_DEVS2);
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if (devs1 < 0 || devs2 < 0)
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continue;
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mdio->prtad = prtad;
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mdio->mmds = devs1 | (devs2 << 16);
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return 0;
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}
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return -ENODEV;
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}
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EXPORT_SYMBOL(mdio45_probe);
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/**
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* mdio_set_flag - set or clear flag in an MDIO register
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* @mdio: MDIO interface
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* @prtad: PHY address
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* @devad: MMD address
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* @addr: Register address
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* @mask: Mask for flag (single bit set)
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* @sense: New value of flag
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*
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* This debounces changes: it does not write the register if the flag
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* already has the proper value. Returns 0 on success, negative on error.
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*/
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int mdio_set_flag(const struct mdio_if_info *mdio,
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int prtad, int devad, u16 addr, int mask,
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bool sense)
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{
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int old_val = mdio->mdio_read(mdio->dev, prtad, devad, addr);
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int new_val;
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if (old_val < 0)
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return old_val;
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if (sense)
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new_val = old_val | mask;
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else
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new_val = old_val & ~mask;
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if (old_val == new_val)
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return 0;
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return mdio->mdio_write(mdio->dev, prtad, devad, addr, new_val);
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}
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EXPORT_SYMBOL(mdio_set_flag);
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/**
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* mdio_link_ok - is link status up/OK
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* @mdio: MDIO interface
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* @mmd_mask: Mask for MMDs to check
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*
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* Returns 1 if the PHY reports link status up/OK, 0 otherwise.
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* @mmd_mask is normally @mdio->mmds, but if loopback is enabled
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* the MMDs being bypassed should be excluded from the mask.
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*/
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int mdio45_links_ok(const struct mdio_if_info *mdio, u32 mmd_mask)
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{
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int devad, reg;
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if (!mmd_mask) {
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/* Use absence of XGMII faults in lieu of link state */
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reg = mdio->mdio_read(mdio->dev, mdio->prtad,
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MDIO_MMD_PHYXS, MDIO_STAT2);
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return reg >= 0 && !(reg & MDIO_STAT2_RXFAULT);
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}
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for (devad = 0; mmd_mask; devad++) {
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if (mmd_mask & (1 << devad)) {
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mmd_mask &= ~(1 << devad);
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/* Reset the latched status and fault flags */
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mdio->mdio_read(mdio->dev, mdio->prtad,
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devad, MDIO_STAT1);
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if (devad == MDIO_MMD_PMAPMD || devad == MDIO_MMD_PCS ||
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devad == MDIO_MMD_PHYXS || devad == MDIO_MMD_DTEXS)
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mdio->mdio_read(mdio->dev, mdio->prtad,
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devad, MDIO_STAT2);
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/* Check the current status and fault flags */
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reg = mdio->mdio_read(mdio->dev, mdio->prtad,
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devad, MDIO_STAT1);
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if (reg < 0 ||
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(reg & (MDIO_STAT1_FAULT | MDIO_STAT1_LSTATUS)) !=
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MDIO_STAT1_LSTATUS)
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return false;
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}
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}
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return true;
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}
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EXPORT_SYMBOL(mdio45_links_ok);
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/**
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* mdio45_nway_restart - restart auto-negotiation for this interface
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* @mdio: MDIO interface
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*
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* Returns 0 on success, negative on error.
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*/
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int mdio45_nway_restart(const struct mdio_if_info *mdio)
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{
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if (!(mdio->mmds & MDIO_DEVS_AN))
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return -EOPNOTSUPP;
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mdio_set_flag(mdio, mdio->prtad, MDIO_MMD_AN, MDIO_CTRL1,
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MDIO_AN_CTRL1_RESTART, true);
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return 0;
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}
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EXPORT_SYMBOL(mdio45_nway_restart);
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static u32 mdio45_get_an(const struct mdio_if_info *mdio, u16 addr)
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{
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u32 result = 0;
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int reg;
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reg = mdio->mdio_read(mdio->dev, mdio->prtad, MDIO_MMD_AN, addr);
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if (reg & ADVERTISE_10HALF)
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result |= ADVERTISED_10baseT_Half;
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if (reg & ADVERTISE_10FULL)
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result |= ADVERTISED_10baseT_Full;
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if (reg & ADVERTISE_100HALF)
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result |= ADVERTISED_100baseT_Half;
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if (reg & ADVERTISE_100FULL)
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result |= ADVERTISED_100baseT_Full;
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if (reg & ADVERTISE_PAUSE_CAP)
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result |= ADVERTISED_Pause;
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if (reg & ADVERTISE_PAUSE_ASYM)
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result |= ADVERTISED_Asym_Pause;
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return result;
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}
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/**
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* mdio45_ethtool_gset_npage - get settings for ETHTOOL_GSET
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* @mdio: MDIO interface
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* @ecmd: Ethtool request structure
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* @npage_adv: Modes currently advertised on next pages
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* @npage_lpa: Modes advertised by link partner on next pages
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*
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* The @ecmd parameter is expected to have been cleared before calling
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* mdio45_ethtool_gset_npage().
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*
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* Since the CSRs for auto-negotiation using next pages are not fully
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* standardised, this function does not attempt to decode them. The
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* caller must pass them in.
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*/
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void mdio45_ethtool_gset_npage(const struct mdio_if_info *mdio,
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struct ethtool_cmd *ecmd,
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u32 npage_adv, u32 npage_lpa)
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{
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int reg;
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u32 speed;
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BUILD_BUG_ON(MDIO_SUPPORTS_C22 != ETH_MDIO_SUPPORTS_C22);
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BUILD_BUG_ON(MDIO_SUPPORTS_C45 != ETH_MDIO_SUPPORTS_C45);
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ecmd->transceiver = XCVR_INTERNAL;
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ecmd->phy_address = mdio->prtad;
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ecmd->mdio_support =
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mdio->mode_support & (MDIO_SUPPORTS_C45 | MDIO_SUPPORTS_C22);
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reg = mdio->mdio_read(mdio->dev, mdio->prtad, MDIO_MMD_PMAPMD,
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MDIO_CTRL2);
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switch (reg & MDIO_PMA_CTRL2_TYPE) {
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case MDIO_PMA_CTRL2_10GBT:
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case MDIO_PMA_CTRL2_1000BT:
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case MDIO_PMA_CTRL2_100BTX:
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case MDIO_PMA_CTRL2_10BT:
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ecmd->port = PORT_TP;
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ecmd->supported = SUPPORTED_TP;
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reg = mdio->mdio_read(mdio->dev, mdio->prtad, MDIO_MMD_PMAPMD,
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MDIO_SPEED);
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if (reg & MDIO_SPEED_10G)
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ecmd->supported |= SUPPORTED_10000baseT_Full;
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if (reg & MDIO_PMA_SPEED_1000)
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ecmd->supported |= (SUPPORTED_1000baseT_Full |
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SUPPORTED_1000baseT_Half);
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if (reg & MDIO_PMA_SPEED_100)
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ecmd->supported |= (SUPPORTED_100baseT_Full |
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SUPPORTED_100baseT_Half);
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if (reg & MDIO_PMA_SPEED_10)
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ecmd->supported |= (SUPPORTED_10baseT_Full |
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SUPPORTED_10baseT_Half);
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ecmd->advertising = ADVERTISED_TP;
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break;
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case MDIO_PMA_CTRL2_10GBCX4:
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ecmd->port = PORT_OTHER;
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ecmd->supported = 0;
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ecmd->advertising = 0;
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break;
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case MDIO_PMA_CTRL2_10GBKX4:
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case MDIO_PMA_CTRL2_10GBKR:
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case MDIO_PMA_CTRL2_1000BKX:
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ecmd->port = PORT_OTHER;
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ecmd->supported = SUPPORTED_Backplane;
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reg = mdio->mdio_read(mdio->dev, mdio->prtad, MDIO_MMD_PMAPMD,
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MDIO_PMA_EXTABLE);
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if (reg & MDIO_PMA_EXTABLE_10GBKX4)
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ecmd->supported |= SUPPORTED_10000baseKX4_Full;
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if (reg & MDIO_PMA_EXTABLE_10GBKR)
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ecmd->supported |= SUPPORTED_10000baseKR_Full;
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if (reg & MDIO_PMA_EXTABLE_1000BKX)
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ecmd->supported |= SUPPORTED_1000baseKX_Full;
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reg = mdio->mdio_read(mdio->dev, mdio->prtad, MDIO_MMD_PMAPMD,
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MDIO_PMA_10GBR_FECABLE);
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if (reg & MDIO_PMA_10GBR_FECABLE_ABLE)
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ecmd->supported |= SUPPORTED_10000baseR_FEC;
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ecmd->advertising = ADVERTISED_Backplane;
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break;
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/* All the other defined modes are flavours of optical */
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default:
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ecmd->port = PORT_FIBRE;
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ecmd->supported = SUPPORTED_FIBRE;
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ecmd->advertising = ADVERTISED_FIBRE;
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break;
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}
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if (mdio->mmds & MDIO_DEVS_AN) {
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ecmd->supported |= SUPPORTED_Autoneg;
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reg = mdio->mdio_read(mdio->dev, mdio->prtad, MDIO_MMD_AN,
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MDIO_CTRL1);
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if (reg & MDIO_AN_CTRL1_ENABLE) {
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ecmd->autoneg = AUTONEG_ENABLE;
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ecmd->advertising |=
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ADVERTISED_Autoneg |
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mdio45_get_an(mdio, MDIO_AN_ADVERTISE) |
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npage_adv;
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} else {
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ecmd->autoneg = AUTONEG_DISABLE;
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}
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} else {
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ecmd->autoneg = AUTONEG_DISABLE;
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}
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if (ecmd->autoneg) {
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u32 modes = 0;
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int an_stat = mdio->mdio_read(mdio->dev, mdio->prtad,
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MDIO_MMD_AN, MDIO_STAT1);
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/* If AN is complete and successful, report best common
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* mode, otherwise report best advertised mode. */
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if (an_stat & MDIO_AN_STAT1_COMPLETE) {
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ecmd->lp_advertising =
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mdio45_get_an(mdio, MDIO_AN_LPA) | npage_lpa;
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if (an_stat & MDIO_AN_STAT1_LPABLE)
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ecmd->lp_advertising |= ADVERTISED_Autoneg;
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modes = ecmd->advertising & ecmd->lp_advertising;
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}
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if ((modes & ~ADVERTISED_Autoneg) == 0)
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modes = ecmd->advertising;
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if (modes & (ADVERTISED_10000baseT_Full |
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ADVERTISED_10000baseKX4_Full |
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ADVERTISED_10000baseKR_Full)) {
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speed = SPEED_10000;
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ecmd->duplex = DUPLEX_FULL;
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} else if (modes & (ADVERTISED_1000baseT_Full |
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ADVERTISED_1000baseT_Half |
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ADVERTISED_1000baseKX_Full)) {
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speed = SPEED_1000;
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ecmd->duplex = !(modes & ADVERTISED_1000baseT_Half);
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} else if (modes & (ADVERTISED_100baseT_Full |
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ADVERTISED_100baseT_Half)) {
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speed = SPEED_100;
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ecmd->duplex = !!(modes & ADVERTISED_100baseT_Full);
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} else {
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speed = SPEED_10;
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ecmd->duplex = !!(modes & ADVERTISED_10baseT_Full);
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}
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} else {
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/* Report forced settings */
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reg = mdio->mdio_read(mdio->dev, mdio->prtad, MDIO_MMD_PMAPMD,
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MDIO_CTRL1);
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speed = (((reg & MDIO_PMA_CTRL1_SPEED1000) ? 100 : 1)
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* ((reg & MDIO_PMA_CTRL1_SPEED100) ? 100 : 10));
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ecmd->duplex = (reg & MDIO_CTRL1_FULLDPLX ||
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speed == SPEED_10000);
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}
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ethtool_cmd_speed_set(ecmd, speed);
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/* 10GBASE-T MDI/MDI-X */
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if (ecmd->port == PORT_TP
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&& (ethtool_cmd_speed(ecmd) == SPEED_10000)) {
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switch (mdio->mdio_read(mdio->dev, mdio->prtad, MDIO_MMD_PMAPMD,
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MDIO_PMA_10GBT_SWAPPOL)) {
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case MDIO_PMA_10GBT_SWAPPOL_ABNX | MDIO_PMA_10GBT_SWAPPOL_CDNX:
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ecmd->eth_tp_mdix = ETH_TP_MDI;
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break;
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case 0:
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ecmd->eth_tp_mdix = ETH_TP_MDI_X;
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||
|
|
break;
|
||
|
|
default:
|
||
|
|
/* It's complicated... */
|
||
|
|
ecmd->eth_tp_mdix = ETH_TP_MDI_INVALID;
|
||
|
|
break;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}
|
||
|
|
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:
|
||
|
|
case SIOCSMIIREG:
|
||
|
|
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);
|