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929 lines
26 KiB
929 lines
26 KiB
// SPDX-License-Identifier: GPL-2.0+ |
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/* |
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* Core PHY library, taken from phy.c |
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*/ |
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#include <linux/export.h> |
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#include <linux/phy.h> |
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#include <linux/of.h> |
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|
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/** |
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* phy_speed_to_str - Return a string representing the PHY link speed |
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* |
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* @speed: Speed of the link |
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*/ |
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const char *phy_speed_to_str(int speed) |
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{ |
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BUILD_BUG_ON_MSG(__ETHTOOL_LINK_MODE_MASK_NBITS != 92, |
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"Enum ethtool_link_mode_bit_indices and phylib are out of sync. " |
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"If a speed or mode has been added please update phy_speed_to_str " |
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"and the PHY settings array.\n"); |
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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_200000: |
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return "200Gbps"; |
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case SPEED_400000: |
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return "400Gbps"; |
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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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|
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/** |
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* phy_duplex_to_str - Return string describing the duplex |
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* |
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* @duplex: Duplex setting to describe |
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*/ |
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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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|
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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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|
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#define PHY_SETTING(s, d, b) { .speed = SPEED_ ## s, .duplex = DUPLEX_ ## d, \ |
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.bit = ETHTOOL_LINK_MODE_ ## b ## _BIT} |
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|
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static const struct phy_setting settings[] = { |
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/* 400G */ |
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PHY_SETTING( 400000, FULL, 400000baseCR8_Full ), |
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PHY_SETTING( 400000, FULL, 400000baseKR8_Full ), |
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PHY_SETTING( 400000, FULL, 400000baseLR8_ER8_FR8_Full ), |
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PHY_SETTING( 400000, FULL, 400000baseDR8_Full ), |
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PHY_SETTING( 400000, FULL, 400000baseSR8_Full ), |
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PHY_SETTING( 400000, FULL, 400000baseCR4_Full ), |
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PHY_SETTING( 400000, FULL, 400000baseKR4_Full ), |
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PHY_SETTING( 400000, FULL, 400000baseLR4_ER4_FR4_Full ), |
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PHY_SETTING( 400000, FULL, 400000baseDR4_Full ), |
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PHY_SETTING( 400000, FULL, 400000baseSR4_Full ), |
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/* 200G */ |
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PHY_SETTING( 200000, FULL, 200000baseCR4_Full ), |
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PHY_SETTING( 200000, FULL, 200000baseKR4_Full ), |
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PHY_SETTING( 200000, FULL, 200000baseLR4_ER4_FR4_Full ), |
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PHY_SETTING( 200000, FULL, 200000baseDR4_Full ), |
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PHY_SETTING( 200000, FULL, 200000baseSR4_Full ), |
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PHY_SETTING( 200000, FULL, 200000baseCR2_Full ), |
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PHY_SETTING( 200000, FULL, 200000baseKR2_Full ), |
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PHY_SETTING( 200000, FULL, 200000baseLR2_ER2_FR2_Full ), |
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PHY_SETTING( 200000, FULL, 200000baseDR2_Full ), |
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PHY_SETTING( 200000, FULL, 200000baseSR2_Full ), |
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/* 100G */ |
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PHY_SETTING( 100000, FULL, 100000baseCR4_Full ), |
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PHY_SETTING( 100000, FULL, 100000baseKR4_Full ), |
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PHY_SETTING( 100000, FULL, 100000baseLR4_ER4_Full ), |
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PHY_SETTING( 100000, FULL, 100000baseSR4_Full ), |
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PHY_SETTING( 100000, FULL, 100000baseCR2_Full ), |
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PHY_SETTING( 100000, FULL, 100000baseKR2_Full ), |
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PHY_SETTING( 100000, FULL, 100000baseLR2_ER2_FR2_Full ), |
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PHY_SETTING( 100000, FULL, 100000baseDR2_Full ), |
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PHY_SETTING( 100000, FULL, 100000baseSR2_Full ), |
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PHY_SETTING( 100000, FULL, 100000baseCR_Full ), |
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PHY_SETTING( 100000, FULL, 100000baseKR_Full ), |
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PHY_SETTING( 100000, FULL, 100000baseLR_ER_FR_Full ), |
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PHY_SETTING( 100000, FULL, 100000baseDR_Full ), |
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PHY_SETTING( 100000, FULL, 100000baseSR_Full ), |
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/* 56G */ |
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PHY_SETTING( 56000, FULL, 56000baseCR4_Full ), |
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PHY_SETTING( 56000, FULL, 56000baseKR4_Full ), |
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PHY_SETTING( 56000, FULL, 56000baseLR4_Full ), |
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PHY_SETTING( 56000, FULL, 56000baseSR4_Full ), |
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/* 50G */ |
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PHY_SETTING( 50000, FULL, 50000baseCR2_Full ), |
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PHY_SETTING( 50000, FULL, 50000baseKR2_Full ), |
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PHY_SETTING( 50000, FULL, 50000baseSR2_Full ), |
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PHY_SETTING( 50000, FULL, 50000baseCR_Full ), |
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PHY_SETTING( 50000, FULL, 50000baseKR_Full ), |
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PHY_SETTING( 50000, FULL, 50000baseLR_ER_FR_Full ), |
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PHY_SETTING( 50000, FULL, 50000baseDR_Full ), |
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PHY_SETTING( 50000, FULL, 50000baseSR_Full ), |
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/* 40G */ |
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PHY_SETTING( 40000, FULL, 40000baseCR4_Full ), |
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PHY_SETTING( 40000, FULL, 40000baseKR4_Full ), |
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PHY_SETTING( 40000, FULL, 40000baseLR4_Full ), |
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PHY_SETTING( 40000, FULL, 40000baseSR4_Full ), |
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/* 25G */ |
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PHY_SETTING( 25000, FULL, 25000baseCR_Full ), |
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PHY_SETTING( 25000, FULL, 25000baseKR_Full ), |
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PHY_SETTING( 25000, FULL, 25000baseSR_Full ), |
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/* 20G */ |
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PHY_SETTING( 20000, FULL, 20000baseKR2_Full ), |
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PHY_SETTING( 20000, FULL, 20000baseMLD2_Full ), |
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/* 10G */ |
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PHY_SETTING( 10000, FULL, 10000baseCR_Full ), |
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PHY_SETTING( 10000, FULL, 10000baseER_Full ), |
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PHY_SETTING( 10000, FULL, 10000baseKR_Full ), |
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PHY_SETTING( 10000, FULL, 10000baseKX4_Full ), |
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PHY_SETTING( 10000, FULL, 10000baseLR_Full ), |
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PHY_SETTING( 10000, FULL, 10000baseLRM_Full ), |
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PHY_SETTING( 10000, FULL, 10000baseR_FEC ), |
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PHY_SETTING( 10000, FULL, 10000baseSR_Full ), |
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PHY_SETTING( 10000, FULL, 10000baseT_Full ), |
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/* 5G */ |
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PHY_SETTING( 5000, FULL, 5000baseT_Full ), |
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/* 2.5G */ |
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PHY_SETTING( 2500, FULL, 2500baseT_Full ), |
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PHY_SETTING( 2500, FULL, 2500baseX_Full ), |
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/* 1G */ |
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PHY_SETTING( 1000, FULL, 1000baseKX_Full ), |
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PHY_SETTING( 1000, FULL, 1000baseT_Full ), |
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PHY_SETTING( 1000, HALF, 1000baseT_Half ), |
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PHY_SETTING( 1000, FULL, 1000baseT1_Full ), |
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PHY_SETTING( 1000, FULL, 1000baseX_Full ), |
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/* 100M */ |
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PHY_SETTING( 100, FULL, 100baseT_Full ), |
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PHY_SETTING( 100, FULL, 100baseT1_Full ), |
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PHY_SETTING( 100, HALF, 100baseT_Half ), |
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PHY_SETTING( 100, HALF, 100baseFX_Half ), |
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PHY_SETTING( 100, FULL, 100baseFX_Full ), |
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/* 10M */ |
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PHY_SETTING( 10, FULL, 10baseT_Full ), |
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PHY_SETTING( 10, HALF, 10baseT_Half ), |
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}; |
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#undef PHY_SETTING |
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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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* @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, 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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|
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for (i = 0, p = settings; i < ARRAY_SIZE(settings); i++, p++) { |
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if (p->bit < __ETHTOOL_LINK_MODE_MASK_NBITS && |
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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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|
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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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|
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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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|
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size_t phy_speeds(unsigned int *speeds, size_t size, |
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unsigned long *mask) |
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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 < __ETHTOOL_LINK_MODE_MASK_NBITS && |
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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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static int __set_linkmode_max_speed(u32 max_speed, unsigned long *addr) |
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{ |
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const struct phy_setting *p; |
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int i; |
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|
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for (i = 0, p = settings; i < ARRAY_SIZE(settings); i++, p++) { |
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if (p->speed > max_speed) |
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linkmode_clear_bit(p->bit, addr); |
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else |
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break; |
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} |
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return 0; |
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} |
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static int __set_phy_supported(struct phy_device *phydev, u32 max_speed) |
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{ |
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return __set_linkmode_max_speed(max_speed, phydev->supported); |
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} |
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|
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/** |
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* phy_set_max_speed - Set the maximum speed the PHY should support |
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* |
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* @phydev: The phy_device struct |
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* @max_speed: Maximum speed |
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* |
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* The PHY might be more capable than the MAC. For example a Fast Ethernet |
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* is connected to a 1G PHY. This function allows the MAC to indicate its |
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* maximum speed, and so limit what the PHY will advertise. |
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*/ |
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int phy_set_max_speed(struct phy_device *phydev, u32 max_speed) |
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{ |
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int err; |
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err = __set_phy_supported(phydev, max_speed); |
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if (err) |
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return err; |
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phy_advertise_supported(phydev); |
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return 0; |
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} |
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EXPORT_SYMBOL(phy_set_max_speed); |
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|
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void of_set_phy_supported(struct phy_device *phydev) |
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{ |
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struct device_node *node = phydev->mdio.dev.of_node; |
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u32 max_speed; |
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if (!IS_ENABLED(CONFIG_OF_MDIO)) |
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return; |
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if (!node) |
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return; |
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if (!of_property_read_u32(node, "max-speed", &max_speed)) |
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__set_phy_supported(phydev, max_speed); |
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} |
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void of_set_phy_eee_broken(struct phy_device *phydev) |
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{ |
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struct device_node *node = phydev->mdio.dev.of_node; |
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u32 broken = 0; |
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if (!IS_ENABLED(CONFIG_OF_MDIO)) |
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return; |
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if (!node) |
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return; |
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if (of_property_read_bool(node, "eee-broken-100tx")) |
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broken |= MDIO_EEE_100TX; |
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if (of_property_read_bool(node, "eee-broken-1000t")) |
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broken |= MDIO_EEE_1000T; |
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if (of_property_read_bool(node, "eee-broken-10gt")) |
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broken |= MDIO_EEE_10GT; |
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if (of_property_read_bool(node, "eee-broken-1000kx")) |
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broken |= MDIO_EEE_1000KX; |
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if (of_property_read_bool(node, "eee-broken-10gkx4")) |
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broken |= MDIO_EEE_10GKX4; |
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if (of_property_read_bool(node, "eee-broken-10gkr")) |
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broken |= MDIO_EEE_10GKR; |
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phydev->eee_broken_modes = broken; |
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} |
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|
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/** |
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* phy_resolve_aneg_pause - Determine pause autoneg results |
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* |
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* @phydev: The phy_device struct |
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* |
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* Once autoneg has completed the local pause settings can be |
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* resolved. Determine if pause and asymmetric pause should be used |
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* by the MAC. |
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*/ |
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|
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void phy_resolve_aneg_pause(struct phy_device *phydev) |
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{ |
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if (phydev->duplex == DUPLEX_FULL) { |
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phydev->pause = linkmode_test_bit(ETHTOOL_LINK_MODE_Pause_BIT, |
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phydev->lp_advertising); |
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phydev->asym_pause = linkmode_test_bit( |
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ETHTOOL_LINK_MODE_Asym_Pause_BIT, |
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phydev->lp_advertising); |
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} |
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} |
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EXPORT_SYMBOL_GPL(phy_resolve_aneg_pause); |
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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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__ETHTOOL_DECLARE_LINK_MODE_MASK(common); |
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int i; |
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|
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linkmode_and(common, phydev->lp_advertising, phydev->advertising); |
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|
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for (i = 0; i < ARRAY_SIZE(settings); i++) |
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if (test_bit(settings[i].bit, common)) { |
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phydev->speed = settings[i].speed; |
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phydev->duplex = settings[i].duplex; |
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break; |
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} |
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|
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phy_resolve_aneg_pause(phydev); |
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} |
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EXPORT_SYMBOL_GPL(phy_resolve_aneg_linkmode); |
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|
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/** |
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* phy_check_downshift - check whether downshift occurred |
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* @phydev: The phy_device struct |
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* |
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* Check whether a downshift to a lower speed occurred. If this should be the |
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* case warn the user. |
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* Prerequisite for detecting downshift is that PHY driver implements the |
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* read_status callback and sets phydev->speed to the actual link speed. |
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*/ |
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void phy_check_downshift(struct phy_device *phydev) |
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{ |
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__ETHTOOL_DECLARE_LINK_MODE_MASK(common); |
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int i, speed = SPEED_UNKNOWN; |
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|
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phydev->downshifted_rate = 0; |
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|
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if (phydev->autoneg == AUTONEG_DISABLE || |
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phydev->speed == SPEED_UNKNOWN) |
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return; |
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|
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linkmode_and(common, phydev->lp_advertising, phydev->advertising); |
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|
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for (i = 0; i < ARRAY_SIZE(settings); i++) |
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if (test_bit(settings[i].bit, common)) { |
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speed = settings[i].speed; |
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break; |
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} |
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|
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if (speed == SPEED_UNKNOWN || phydev->speed >= speed) |
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return; |
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|
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phydev_warn(phydev, "Downshift occurred from negotiated speed %s to actual speed %s, check cabling!\n", |
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phy_speed_to_str(speed), phy_speed_to_str(phydev->speed)); |
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|
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phydev->downshifted_rate = 1; |
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} |
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EXPORT_SYMBOL_GPL(phy_check_downshift); |
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|
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static int phy_resolve_min_speed(struct phy_device *phydev, bool fdx_only) |
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{ |
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__ETHTOOL_DECLARE_LINK_MODE_MASK(common); |
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int i = ARRAY_SIZE(settings); |
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|
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linkmode_and(common, phydev->lp_advertising, phydev->advertising); |
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|
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while (--i >= 0) { |
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if (test_bit(settings[i].bit, common)) { |
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if (fdx_only && settings[i].duplex != DUPLEX_FULL) |
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continue; |
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return settings[i].speed; |
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} |
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} |
|
|
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return SPEED_UNKNOWN; |
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} |
|
|
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int phy_speed_down_core(struct phy_device *phydev) |
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{ |
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int min_common_speed = phy_resolve_min_speed(phydev, true); |
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|
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if (min_common_speed == SPEED_UNKNOWN) |
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return -EINVAL; |
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|
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return __set_linkmode_max_speed(min_common_speed, phydev->advertising); |
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} |
|
|
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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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|
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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 && 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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val = __mdiobus_c45_read(phydev->mdio.bus, phydev->mdio.addr, |
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devad, regnum); |
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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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|
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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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} |
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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_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 |
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* @regnum: The register on the MMD to read |
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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 ret; |
|
|
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phy_lock_mdio_bus(phydev); |
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ret = __phy_read_mmd(phydev, devad, regnum); |
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phy_unlock_mdio_bus(phydev); |
|
|
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return ret; |
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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. |
|
* @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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int __phy_write_mmd(struct phy_device *phydev, int devad, u32 regnum, u16 val) |
|
{ |
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int ret; |
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|
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if (regnum > (u16)~0 || devad > 32) |
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return -EINVAL; |
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|
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if (phydev->drv && 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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ret = __mdiobus_c45_write(phydev->mdio.bus, phydev->mdio.addr, |
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devad, regnum, 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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|
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mmd_phy_indirect(bus, phy_addr, devad, regnum); |
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|
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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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|
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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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/** |
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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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|
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phy_lock_mdio_bus(phydev); |
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ret = __phy_write_mmd(phydev, devad, regnum, val); |
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phy_unlock_mdio_bus(phydev); |
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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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/** |
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* phy_modify_changed - Function for modifying a PHY register |
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* @phydev: the phy_device struct |
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* @regnum: register number to modify |
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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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* Returns negative errno, 0 if there was no change, and 1 in case of change |
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*/ |
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int phy_modify_changed(struct phy_device *phydev, u32 regnum, u16 mask, u16 set) |
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{ |
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int ret; |
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|
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phy_lock_mdio_bus(phydev); |
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ret = __phy_modify_changed(phydev, regnum, mask, set); |
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phy_unlock_mdio_bus(phydev); |
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return ret; |
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} |
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EXPORT_SYMBOL_GPL(phy_modify_changed); |
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|
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/** |
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* __phy_modify - Convenience function for modifying a PHY register |
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* @phydev: the phy_device struct |
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* @regnum: register number to modify |
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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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|
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ret = __phy_modify_changed(phydev, regnum, mask, set); |
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|
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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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/** |
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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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* |
|
* NOTE: MUST NOT be called from interrupt context, |
|
* because the bus read/write functions may wait for an interrupt |
|
* 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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|
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phy_lock_mdio_bus(phydev); |
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ret = __phy_modify(phydev, regnum, mask, set); |
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phy_unlock_mdio_bus(phydev); |
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|
|
return ret; |
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} |
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EXPORT_SYMBOL_GPL(phy_modify); |
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|
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/** |
|
* __phy_modify_mmd_changed - Function for modifying a register on MMD |
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* @phydev: the phy_device struct |
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* @devad: the MMD containing register to modify |
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* @regnum: register number to modify |
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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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* Unlocked helper function which allows a MMD 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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* Returns negative errno, 0 if there was no change, and 1 in case of change |
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*/ |
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int __phy_modify_mmd_changed(struct phy_device *phydev, int devad, u32 regnum, |
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u16 mask, u16 set) |
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{ |
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int new, ret; |
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|
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ret = __phy_read_mmd(phydev, devad, regnum); |
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if (ret < 0) |
|
return ret; |
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|
|
new = (ret & ~mask) | set; |
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if (new == ret) |
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return 0; |
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|
|
ret = __phy_write_mmd(phydev, devad, regnum, new); |
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|
|
return ret < 0 ? ret : 1; |
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} |
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EXPORT_SYMBOL_GPL(__phy_modify_mmd_changed); |
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|
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/** |
|
* phy_modify_mmd_changed - Function for modifying a register on MMD |
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* @phydev: the phy_device struct |
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* @devad: the MMD containing register to modify |
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* @regnum: register number to modify |
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* @mask: bit mask of bits to clear |
|
* @set: new value of bits set in mask to write to @regnum |
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* |
|
* NOTE: MUST NOT be called from interrupt context, |
|
* because the bus read/write functions may wait for an interrupt |
|
* to conclude the operation. |
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* |
|
* Returns negative errno, 0 if there was no change, and 1 in case of change |
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*/ |
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int phy_modify_mmd_changed(struct phy_device *phydev, int devad, u32 regnum, |
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u16 mask, u16 set) |
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{ |
|
int ret; |
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|
|
phy_lock_mdio_bus(phydev); |
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ret = __phy_modify_mmd_changed(phydev, devad, regnum, mask, set); |
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phy_unlock_mdio_bus(phydev); |
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|
|
return ret; |
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} |
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EXPORT_SYMBOL_GPL(phy_modify_mmd_changed); |
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|
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/** |
|
* __phy_modify_mmd - Convenience function for modifying a register on MMD |
|
* @phydev: the phy_device struct |
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* @devad: the MMD containing register to modify |
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* @regnum: register number to modify |
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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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* |
|
* NOTE: MUST NOT be called from interrupt context, |
|
* because the bus read/write functions may wait for an interrupt |
|
* to conclude the operation. |
|
*/ |
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int __phy_modify_mmd(struct phy_device *phydev, int devad, u32 regnum, |
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u16 mask, u16 set) |
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{ |
|
int ret; |
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|
|
ret = __phy_modify_mmd_changed(phydev, devad, regnum, mask, set); |
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|
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return ret < 0 ? ret : 0; |
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} |
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EXPORT_SYMBOL_GPL(__phy_modify_mmd); |
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|
|
/** |
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* phy_modify_mmd - Convenience function for modifying a register on MMD |
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* @phydev: the phy_device struct |
|
* @devad: the MMD containing register to modify |
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* @regnum: register number to modify |
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* @mask: bit mask of bits to clear |
|
* @set: new value of bits set in mask to write to @regnum |
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* |
|
* NOTE: MUST NOT be called from interrupt context, |
|
* because the bus read/write functions may wait for an interrupt |
|
* to conclude the operation. |
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*/ |
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int phy_modify_mmd(struct phy_device *phydev, int devad, u32 regnum, |
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u16 mask, u16 set) |
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{ |
|
int ret; |
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|
|
phy_lock_mdio_bus(phydev); |
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ret = __phy_modify_mmd(phydev, devad, regnum, mask, set); |
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phy_unlock_mdio_bus(phydev); |
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|
|
return ret; |
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} |
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EXPORT_SYMBOL_GPL(phy_modify_mmd); |
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|
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static int __phy_read_page(struct phy_device *phydev) |
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{ |
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if (WARN_ONCE(!phydev->drv->read_page, "read_page callback not available, PHY driver not loaded?\n")) |
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return -EOPNOTSUPP; |
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|
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return phydev->drv->read_page(phydev); |
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} |
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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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if (WARN_ONCE(!phydev->drv->write_page, "write_page callback not available, PHY driver not loaded?\n")) |
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return -EOPNOTSUPP; |
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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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/** |
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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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* |
|
* 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 |
|
* 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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{ |
|
phy_lock_mdio_bus(phydev); |
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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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|
|
/** |
|
* 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 |
|
* @page: desired page |
|
* |
|
* Take the MDIO bus lock to protect against concurrent access, save the |
|
* current PHY page, and set the current page. On error, returns a |
|
* negative errno, otherwise returns the previous page number. |
|
* phy_restore_page() must always be called after this, irrespective |
|
* of success or failure of this call. |
|
*/ |
|
int phy_select_page(struct phy_device *phydev, int page) |
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{ |
|
int ret, oldpage; |
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|
|
oldpage = ret = phy_save_page(phydev); |
|
if (ret < 0) |
|
return ret; |
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|
|
if (oldpage != page) { |
|
ret = __phy_write_page(phydev, page); |
|
if (ret < 0) |
|
return ret; |
|
} |
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|
|
return oldpage; |
|
} |
|
EXPORT_SYMBOL_GPL(phy_select_page); |
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|
|
/** |
|
* phy_restore_page() - restore the page register and release the bus lock |
|
* @phydev: a pointer to a &struct phy_device |
|
* @oldpage: the old page, return value from phy_save_page() or phy_select_page() |
|
* @ret: operation's return code |
|
* |
|
* Release the MDIO bus lock, restoring @oldpage if it is a valid page. |
|
* This function propagates the earliest error code from the group of |
|
* operations. |
|
* |
|
* Returns: |
|
* @oldpage if it was a negative value, otherwise |
|
* @ret if it was a negative errno value, otherwise |
|
* phy_write_page()'s negative value if it were in error, otherwise |
|
* @ret. |
|
*/ |
|
int phy_restore_page(struct phy_device *phydev, int oldpage, int ret) |
|
{ |
|
int r; |
|
|
|
if (oldpage >= 0) { |
|
r = __phy_write_page(phydev, oldpage); |
|
|
|
/* Propagate the operation return code if the page write |
|
* was successful. |
|
*/ |
|
if (ret >= 0 && r < 0) |
|
ret = r; |
|
} else { |
|
/* Propagate the phy page selection error code */ |
|
ret = oldpage; |
|
} |
|
|
|
phy_unlock_mdio_bus(phydev); |
|
|
|
return ret; |
|
} |
|
EXPORT_SYMBOL_GPL(phy_restore_page); |
|
|
|
/** |
|
* phy_read_paged() - Convenience function for reading a paged register |
|
* @phydev: a pointer to a &struct phy_device |
|
* @page: the page for the phy |
|
* @regnum: register number |
|
* |
|
* Same rules as for phy_read(). |
|
*/ |
|
int phy_read_paged(struct phy_device *phydev, int page, u32 regnum) |
|
{ |
|
int ret = 0, oldpage; |
|
|
|
oldpage = phy_select_page(phydev, page); |
|
if (oldpage >= 0) |
|
ret = __phy_read(phydev, regnum); |
|
|
|
return phy_restore_page(phydev, oldpage, ret); |
|
} |
|
EXPORT_SYMBOL(phy_read_paged); |
|
|
|
/** |
|
* phy_write_paged() - Convenience function for writing a paged register |
|
* @phydev: a pointer to a &struct phy_device |
|
* @page: the page for the phy |
|
* @regnum: register number |
|
* @val: value to write |
|
* |
|
* Same rules as for phy_write(). |
|
*/ |
|
int phy_write_paged(struct phy_device *phydev, int page, u32 regnum, u16 val) |
|
{ |
|
int ret = 0, oldpage; |
|
|
|
oldpage = phy_select_page(phydev, page); |
|
if (oldpage >= 0) |
|
ret = __phy_write(phydev, regnum, val); |
|
|
|
return phy_restore_page(phydev, oldpage, ret); |
|
} |
|
EXPORT_SYMBOL(phy_write_paged); |
|
|
|
/** |
|
* phy_modify_paged_changed() - Function for modifying a paged register |
|
* @phydev: a pointer to a &struct phy_device |
|
* @page: the page for the phy |
|
* @regnum: register number |
|
* @mask: bit mask of bits to clear |
|
* @set: bit mask of bits to set |
|
* |
|
* Returns negative errno, 0 if there was no change, and 1 in case of change |
|
*/ |
|
int phy_modify_paged_changed(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_changed(phydev, regnum, mask, set); |
|
|
|
return phy_restore_page(phydev, oldpage, ret); |
|
} |
|
EXPORT_SYMBOL(phy_modify_paged_changed); |
|
|
|
/** |
|
* phy_modify_paged() - Convenience function for modifying a paged register |
|
* @phydev: a pointer to a &struct phy_device |
|
* @page: the page for the phy |
|
* @regnum: register number |
|
* @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 = phy_modify_paged_changed(phydev, page, regnum, mask, set); |
|
|
|
return ret < 0 ? ret : 0; |
|
} |
|
EXPORT_SYMBOL(phy_modify_paged);
|
|
|