168 lines
3.5 KiB
C
168 lines
3.5 KiB
C
// SPDX-License-Identifier: GPL-2.0+
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/*
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* Software PHY emulation
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*
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* Code taken from fixed_phy.c by Russell King <rmk+kernel@arm.linux.org.uk>
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*
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* Author: Vitaly Bordug <vbordug@ru.mvista.com>
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* Anton Vorontsov <avorontsov@ru.mvista.com>
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*
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* Copyright (c) 2006-2007 MontaVista Software, Inc.
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*/
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#include <linux/export.h>
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#include <linux/mii.h>
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#include <linux/phy.h>
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#include <linux/phy_fixed.h>
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#include "swphy.h"
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#define MII_REGS_NUM 29
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struct swmii_regs {
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u16 bmsr;
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u16 lpa;
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u16 lpagb;
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};
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enum {
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SWMII_SPEED_10 = 0,
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SWMII_SPEED_100,
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SWMII_SPEED_1000,
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SWMII_DUPLEX_HALF = 0,
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SWMII_DUPLEX_FULL,
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};
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/*
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* These two tables get bitwise-anded together to produce the final result.
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* This means the speed table must contain both duplex settings, and the
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* duplex table must contain all speed settings.
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*/
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static const struct swmii_regs speed[] = {
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[SWMII_SPEED_10] = {
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.lpa = LPA_10FULL | LPA_10HALF,
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},
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[SWMII_SPEED_100] = {
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.bmsr = BMSR_100FULL | BMSR_100HALF,
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.lpa = LPA_100FULL | LPA_100HALF,
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},
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[SWMII_SPEED_1000] = {
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.bmsr = BMSR_ESTATEN,
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.lpagb = LPA_1000FULL | LPA_1000HALF,
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},
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};
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static const struct swmii_regs duplex[] = {
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[SWMII_DUPLEX_HALF] = {
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.bmsr = BMSR_ESTATEN | BMSR_100HALF,
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.lpa = LPA_10HALF | LPA_100HALF,
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.lpagb = LPA_1000HALF,
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},
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[SWMII_DUPLEX_FULL] = {
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.bmsr = BMSR_ESTATEN | BMSR_100FULL,
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.lpa = LPA_10FULL | LPA_100FULL,
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.lpagb = LPA_1000FULL,
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},
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};
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static int swphy_decode_speed(int speed)
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{
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switch (speed) {
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case 1000:
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return SWMII_SPEED_1000;
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case 100:
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return SWMII_SPEED_100;
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case 10:
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return SWMII_SPEED_10;
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default:
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return -EINVAL;
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}
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}
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/**
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* swphy_validate_state - validate the software phy status
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* @state: software phy status
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*
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* This checks that we can represent the state stored in @state can be
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* represented in the emulated MII registers. Returns 0 if it can,
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* otherwise returns -EINVAL.
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*/
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int swphy_validate_state(const struct fixed_phy_status *state)
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{
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int err;
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if (state->link) {
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err = swphy_decode_speed(state->speed);
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if (err < 0) {
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pr_warn("swphy: unknown speed\n");
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return -EINVAL;
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}
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}
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return 0;
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}
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EXPORT_SYMBOL_GPL(swphy_validate_state);
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/**
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* swphy_read_reg - return a MII register from the fixed phy state
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* @reg: MII register
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* @state: fixed phy status
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*
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* Return the MII @reg register generated from the fixed phy state @state.
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*/
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int swphy_read_reg(int reg, const struct fixed_phy_status *state)
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{
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int speed_index, duplex_index;
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u16 bmsr = BMSR_ANEGCAPABLE;
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u16 lpagb = 0;
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u16 lpa = 0;
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if (reg > MII_REGS_NUM)
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return -1;
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speed_index = swphy_decode_speed(state->speed);
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if (WARN_ON(speed_index < 0))
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return 0;
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duplex_index = state->duplex ? SWMII_DUPLEX_FULL : SWMII_DUPLEX_HALF;
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bmsr |= speed[speed_index].bmsr & duplex[duplex_index].bmsr;
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if (state->link) {
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bmsr |= BMSR_LSTATUS | BMSR_ANEGCOMPLETE;
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lpa |= speed[speed_index].lpa & duplex[duplex_index].lpa;
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lpagb |= speed[speed_index].lpagb & duplex[duplex_index].lpagb;
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if (state->pause)
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lpa |= LPA_PAUSE_CAP;
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if (state->asym_pause)
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lpa |= LPA_PAUSE_ASYM;
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}
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switch (reg) {
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case MII_BMCR:
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return BMCR_ANENABLE;
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case MII_BMSR:
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return bmsr;
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case MII_PHYSID1:
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case MII_PHYSID2:
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return 0;
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case MII_LPA:
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return lpa;
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case MII_STAT1000:
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return lpagb;
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/*
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* We do not support emulating Clause 45 over Clause 22 register
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* reads. Return an error instead of bogus data.
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*/
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case MII_MMD_CTRL:
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case MII_MMD_DATA:
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return -1;
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default:
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return 0xffff;
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}
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}
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EXPORT_SYMBOL_GPL(swphy_read_reg);
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