530 lines
14 KiB
C
530 lines
14 KiB
C
/*
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* Core PHY library, taken from phy.c
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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 as published by the
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* Free Software Foundation; either version 2 of the License, or (at your
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* option) any later version.
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*/
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#include <linux/export.h>
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#include <linux/phy.h>
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const char *phy_speed_to_str(int speed)
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{
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switch (speed) {
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case SPEED_10:
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return "10Mbps";
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case SPEED_100:
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return "100Mbps";
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case SPEED_1000:
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return "1Gbps";
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case SPEED_2500:
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return "2.5Gbps";
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case SPEED_5000:
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return "5Gbps";
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case SPEED_10000:
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return "10Gbps";
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case SPEED_14000:
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return "14Gbps";
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case SPEED_20000:
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return "20Gbps";
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case SPEED_25000:
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return "25Gbps";
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case SPEED_40000:
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return "40Gbps";
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case SPEED_50000:
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return "50Gbps";
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case SPEED_56000:
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return "56Gbps";
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case SPEED_100000:
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return "100Gbps";
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case SPEED_UNKNOWN:
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return "Unknown";
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default:
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return "Unsupported (update phy-core.c)";
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}
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}
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EXPORT_SYMBOL_GPL(phy_speed_to_str);
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const char *phy_duplex_to_str(unsigned int duplex)
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{
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if (duplex == DUPLEX_HALF)
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return "Half";
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if (duplex == DUPLEX_FULL)
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return "Full";
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if (duplex == DUPLEX_UNKNOWN)
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return "Unknown";
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return "Unsupported (update phy-core.c)";
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}
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EXPORT_SYMBOL_GPL(phy_duplex_to_str);
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/* A mapping of all SUPPORTED settings to speed/duplex. This table
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* must be grouped by speed and sorted in descending match priority
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* - iow, descending speed. */
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static const struct phy_setting settings[] = {
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{
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.speed = SPEED_10000,
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.duplex = DUPLEX_FULL,
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.bit = ETHTOOL_LINK_MODE_10000baseKR_Full_BIT,
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},
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{
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.speed = SPEED_10000,
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.duplex = DUPLEX_FULL,
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.bit = ETHTOOL_LINK_MODE_10000baseKX4_Full_BIT,
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},
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{
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.speed = SPEED_10000,
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.duplex = DUPLEX_FULL,
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.bit = ETHTOOL_LINK_MODE_10000baseT_Full_BIT,
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},
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{
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.speed = SPEED_2500,
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.duplex = DUPLEX_FULL,
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.bit = ETHTOOL_LINK_MODE_2500baseX_Full_BIT,
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},
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{
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.speed = SPEED_1000,
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.duplex = DUPLEX_FULL,
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.bit = ETHTOOL_LINK_MODE_1000baseKX_Full_BIT,
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},
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{
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.speed = SPEED_1000,
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.duplex = DUPLEX_FULL,
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.bit = ETHTOOL_LINK_MODE_1000baseX_Full_BIT,
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},
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{
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.speed = SPEED_1000,
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.duplex = DUPLEX_FULL,
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.bit = ETHTOOL_LINK_MODE_1000baseT_Full_BIT,
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},
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{
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.speed = SPEED_1000,
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.duplex = DUPLEX_HALF,
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.bit = ETHTOOL_LINK_MODE_1000baseT_Half_BIT,
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},
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{
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.speed = SPEED_100,
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.duplex = DUPLEX_FULL,
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.bit = ETHTOOL_LINK_MODE_100baseT_Full_BIT,
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},
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{
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.speed = SPEED_100,
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.duplex = DUPLEX_HALF,
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.bit = ETHTOOL_LINK_MODE_100baseT_Half_BIT,
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},
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{
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.speed = SPEED_10,
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.duplex = DUPLEX_FULL,
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.bit = ETHTOOL_LINK_MODE_10baseT_Full_BIT,
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},
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{
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.speed = SPEED_10,
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.duplex = DUPLEX_HALF,
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.bit = ETHTOOL_LINK_MODE_10baseT_Half_BIT,
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},
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};
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/**
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* phy_lookup_setting - lookup a PHY setting
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* @speed: speed to match
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* @duplex: duplex to match
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* @mask: allowed link modes
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* @maxbit: bit size of link modes
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* @exact: an exact match is required
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*
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* Search the settings array for a setting that matches the speed and
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* duplex, and which is supported.
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*
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* If @exact is unset, either an exact match or %NULL for no match will
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* be returned.
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*
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* If @exact is set, an exact match, the fastest supported setting at
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* or below the specified speed, the slowest supported setting, or if
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* they all fail, %NULL will be returned.
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*/
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const struct phy_setting *
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phy_lookup_setting(int speed, int duplex, const unsigned long *mask,
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size_t maxbit, bool exact)
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{
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const struct phy_setting *p, *match = NULL, *last = NULL;
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int i;
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for (i = 0, p = settings; i < ARRAY_SIZE(settings); i++, p++) {
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if (p->bit < maxbit && test_bit(p->bit, mask)) {
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last = p;
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if (p->speed == speed && p->duplex == duplex) {
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/* Exact match for speed and duplex */
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match = p;
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break;
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} else if (!exact) {
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if (!match && p->speed <= speed)
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/* Candidate */
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match = p;
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if (p->speed < speed)
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break;
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}
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}
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}
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if (!match && !exact)
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match = last;
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return match;
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}
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EXPORT_SYMBOL_GPL(phy_lookup_setting);
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size_t phy_speeds(unsigned int *speeds, size_t size,
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unsigned long *mask, size_t maxbit)
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{
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size_t count;
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int i;
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for (i = 0, count = 0; i < ARRAY_SIZE(settings) && count < size; i++)
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if (settings[i].bit < maxbit &&
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test_bit(settings[i].bit, mask) &&
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(count == 0 || speeds[count - 1] != settings[i].speed))
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speeds[count++] = settings[i].speed;
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return count;
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}
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/**
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* phy_resolve_aneg_linkmode - resolve the advertisements into phy settings
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* @phydev: The phy_device struct
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*
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* Resolve our and the link partner advertisements into their corresponding
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* speed and duplex. If full duplex was negotiated, extract the pause mode
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* from the link partner mask.
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*/
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void phy_resolve_aneg_linkmode(struct phy_device *phydev)
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{
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u32 common = phydev->lp_advertising & phydev->advertising;
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if (common & ADVERTISED_10000baseT_Full) {
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phydev->speed = SPEED_10000;
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phydev->duplex = DUPLEX_FULL;
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} else if (common & ADVERTISED_1000baseT_Full) {
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phydev->speed = SPEED_1000;
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phydev->duplex = DUPLEX_FULL;
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} else if (common & ADVERTISED_1000baseT_Half) {
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phydev->speed = SPEED_1000;
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phydev->duplex = DUPLEX_HALF;
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} else if (common & ADVERTISED_100baseT_Full) {
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phydev->speed = SPEED_100;
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phydev->duplex = DUPLEX_FULL;
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} else if (common & ADVERTISED_100baseT_Half) {
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phydev->speed = SPEED_100;
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phydev->duplex = DUPLEX_HALF;
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} else if (common & ADVERTISED_10baseT_Full) {
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phydev->speed = SPEED_10;
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phydev->duplex = DUPLEX_FULL;
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} else if (common & ADVERTISED_10baseT_Half) {
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phydev->speed = SPEED_10;
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phydev->duplex = DUPLEX_HALF;
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}
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if (phydev->duplex == DUPLEX_FULL) {
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phydev->pause = !!(phydev->lp_advertising & ADVERTISED_Pause);
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phydev->asym_pause = !!(phydev->lp_advertising &
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ADVERTISED_Asym_Pause);
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}
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}
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EXPORT_SYMBOL_GPL(phy_resolve_aneg_linkmode);
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static void mmd_phy_indirect(struct mii_bus *bus, int phy_addr, int devad,
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u16 regnum)
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{
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/* Write the desired MMD Devad */
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__mdiobus_write(bus, phy_addr, MII_MMD_CTRL, devad);
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/* Write the desired MMD register address */
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__mdiobus_write(bus, phy_addr, MII_MMD_DATA, regnum);
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/* Select the Function : DATA with no post increment */
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__mdiobus_write(bus, phy_addr, MII_MMD_CTRL,
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devad | MII_MMD_CTRL_NOINCR);
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}
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/**
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* phy_read_mmd - Convenience function for reading a register
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* from an MMD on a given PHY.
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* @phydev: The phy_device struct
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* @devad: The MMD to read from (0..31)
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* @regnum: The register on the MMD to read (0..65535)
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*
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* Same rules as for phy_read();
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*/
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int phy_read_mmd(struct phy_device *phydev, int devad, u32 regnum)
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{
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int val;
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if (regnum > (u16)~0 || devad > 32)
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return -EINVAL;
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if (phydev->drv->read_mmd) {
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val = phydev->drv->read_mmd(phydev, devad, regnum);
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} else if (phydev->is_c45) {
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u32 addr = MII_ADDR_C45 | (devad << 16) | (regnum & 0xffff);
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val = mdiobus_read(phydev->mdio.bus, phydev->mdio.addr, addr);
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} else {
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struct mii_bus *bus = phydev->mdio.bus;
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int phy_addr = phydev->mdio.addr;
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mutex_lock(&bus->mdio_lock);
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mmd_phy_indirect(bus, phy_addr, devad, regnum);
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/* Read the content of the MMD's selected register */
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val = __mdiobus_read(bus, phy_addr, MII_MMD_DATA);
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mutex_unlock(&bus->mdio_lock);
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}
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return val;
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}
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EXPORT_SYMBOL(phy_read_mmd);
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/**
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* phy_write_mmd - Convenience function for writing a register
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* on an MMD on a given PHY.
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* @phydev: The phy_device struct
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* @devad: The MMD to read from
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* @regnum: The register on the MMD to read
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* @val: value to write to @regnum
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*
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* Same rules as for phy_write();
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*/
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int phy_write_mmd(struct phy_device *phydev, int devad, u32 regnum, u16 val)
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{
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int ret;
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if (regnum > (u16)~0 || devad > 32)
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return -EINVAL;
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if (phydev->drv->write_mmd) {
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ret = phydev->drv->write_mmd(phydev, devad, regnum, val);
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} else if (phydev->is_c45) {
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u32 addr = MII_ADDR_C45 | (devad << 16) | (regnum & 0xffff);
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ret = mdiobus_write(phydev->mdio.bus, phydev->mdio.addr,
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addr, val);
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} else {
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struct mii_bus *bus = phydev->mdio.bus;
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int phy_addr = phydev->mdio.addr;
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mutex_lock(&bus->mdio_lock);
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mmd_phy_indirect(bus, phy_addr, devad, regnum);
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/* Write the data into MMD's selected register */
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__mdiobus_write(bus, phy_addr, MII_MMD_DATA, val);
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mutex_unlock(&bus->mdio_lock);
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ret = 0;
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}
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return ret;
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}
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EXPORT_SYMBOL(phy_write_mmd);
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/**
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* __phy_modify() - Convenience function for modifying a PHY register
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* @phydev: a pointer to a &struct phy_device
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* @regnum: register number
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* @mask: bit mask of bits to clear
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* @set: bit mask of bits to set
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*
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* Unlocked helper function which allows a PHY register to be modified as
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* new register value = (old register value & ~mask) | set
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*/
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int __phy_modify(struct phy_device *phydev, u32 regnum, u16 mask, u16 set)
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{
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int ret;
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ret = __phy_read(phydev, regnum);
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if (ret < 0)
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return ret;
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ret = __phy_write(phydev, regnum, (ret & ~mask) | set);
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return ret < 0 ? ret : 0;
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}
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EXPORT_SYMBOL_GPL(__phy_modify);
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/**
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* phy_modify - Convenience function for modifying a given PHY register
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* @phydev: the phy_device struct
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* @regnum: register number to write
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* @mask: bit mask of bits to clear
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* @set: new value of bits set in mask to write to @regnum
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*
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* NOTE: MUST NOT be called from interrupt context,
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* because the bus read/write functions may wait for an interrupt
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* to conclude the operation.
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*/
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int phy_modify(struct phy_device *phydev, u32 regnum, u16 mask, u16 set)
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{
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int ret;
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mutex_lock(&phydev->mdio.bus->mdio_lock);
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ret = __phy_modify(phydev, regnum, mask, set);
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mutex_unlock(&phydev->mdio.bus->mdio_lock);
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return ret;
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}
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EXPORT_SYMBOL_GPL(phy_modify);
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static int __phy_read_page(struct phy_device *phydev)
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{
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return phydev->drv->read_page(phydev);
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}
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static int __phy_write_page(struct phy_device *phydev, int page)
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{
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return phydev->drv->write_page(phydev, page);
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}
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/**
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* phy_save_page() - take the bus lock and save the current page
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* @phydev: a pointer to a &struct phy_device
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*
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* Take the MDIO bus lock, and return the current page number. On error,
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* returns a negative errno. phy_restore_page() must always be called
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* after this, irrespective of success or failure of this call.
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*/
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int phy_save_page(struct phy_device *phydev)
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{
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mutex_lock(&phydev->mdio.bus->mdio_lock);
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return __phy_read_page(phydev);
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}
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EXPORT_SYMBOL_GPL(phy_save_page);
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/**
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* phy_select_page() - take the bus lock, save the current page, and set a page
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* @phydev: a pointer to a &struct phy_device
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* @page: desired page
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*
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* Take the MDIO bus lock to protect against concurrent access, save the
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* current PHY page, and set the current page. On error, returns a
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* negative errno, otherwise returns the previous page number.
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* phy_restore_page() must always be called after this, irrespective
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* of success or failure of this call.
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*/
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int phy_select_page(struct phy_device *phydev, int page)
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{
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int ret, oldpage;
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oldpage = ret = phy_save_page(phydev);
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if (ret < 0)
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return ret;
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if (oldpage != page) {
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ret = __phy_write_page(phydev, page);
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if (ret < 0)
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return ret;
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}
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return oldpage;
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}
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EXPORT_SYMBOL_GPL(phy_select_page);
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/**
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* phy_restore_page() - restore the page register and release the bus lock
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* @phydev: a pointer to a &struct phy_device
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* @oldpage: the old page, return value from phy_save_page() or phy_select_page()
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* @ret: operation's return code
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*
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* Release the MDIO bus lock, restoring @oldpage if it is a valid page.
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* This function propagates the earliest error code from the group of
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* operations.
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*
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* Returns:
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* @oldpage if it was a negative value, otherwise
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* @ret if it was a negative errno value, otherwise
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* phy_write_page()'s negative value if it were in error, otherwise
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* @ret.
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*/
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int phy_restore_page(struct phy_device *phydev, int oldpage, int ret)
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{
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int r;
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if (oldpage >= 0) {
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r = __phy_write_page(phydev, oldpage);
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/* Propagate the operation return code if the page write
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* was successful.
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*/
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if (ret >= 0 && r < 0)
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ret = r;
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} else {
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/* Propagate the phy page selection error code */
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ret = oldpage;
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}
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mutex_unlock(&phydev->mdio.bus->mdio_lock);
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return ret;
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}
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EXPORT_SYMBOL_GPL(phy_restore_page);
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/**
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* phy_read_paged() - Convenience function for reading a paged register
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* @phydev: a pointer to a &struct phy_device
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* @page: the page for the phy
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* @regnum: register number
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*
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* Same rules as for phy_read().
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*/
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int phy_read_paged(struct phy_device *phydev, int page, u32 regnum)
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{
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int ret = 0, oldpage;
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oldpage = phy_select_page(phydev, page);
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if (oldpage >= 0)
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ret = __phy_read(phydev, regnum);
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return phy_restore_page(phydev, oldpage, ret);
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}
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EXPORT_SYMBOL(phy_read_paged);
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/**
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* phy_write_paged() - Convenience function for writing a paged register
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* @phydev: a pointer to a &struct phy_device
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* @page: the page for the phy
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* @regnum: register number
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* @val: value to write
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*
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* Same rules as for phy_write().
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*/
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int phy_write_paged(struct phy_device *phydev, int page, u32 regnum, u16 val)
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{
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int ret = 0, oldpage;
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oldpage = phy_select_page(phydev, page);
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if (oldpage >= 0)
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ret = __phy_write(phydev, regnum, val);
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return phy_restore_page(phydev, oldpage, ret);
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}
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EXPORT_SYMBOL(phy_write_paged);
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/**
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* phy_modify_paged() - Convenience function for modifying a paged register
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* @phydev: a pointer to a &struct phy_device
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* @page: the page for the phy
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* @regnum: register number
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* @mask: bit mask of bits to clear
|
|
* @set: bit mask of bits to set
|
|
*
|
|
* Same rules as for phy_read() and phy_write().
|
|
*/
|
|
int phy_modify_paged(struct phy_device *phydev, int page, u32 regnum,
|
|
u16 mask, u16 set)
|
|
{
|
|
int ret = 0, oldpage;
|
|
|
|
oldpage = phy_select_page(phydev, page);
|
|
if (oldpage >= 0)
|
|
ret = __phy_modify(phydev, regnum, mask, set);
|
|
|
|
return phy_restore_page(phydev, oldpage, ret);
|
|
}
|
|
EXPORT_SYMBOL(phy_modify_paged);
|