linux/drivers/net/cxgb3/vsc8211.c

/*
 * This file is part of the Chelsio T3 Ethernet driver.
 *
 * Copyright (C) 2005-2006 Chelsio Communications.  All rights reserved.
 *
 * This program is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the LICENSE file included in this
 * release for licensing terms and conditions.
 */

#include "common.h"

/* VSC8211 PHY specific registers. */
enum {
	VSC8211_INTR_ENABLE = 25,
	VSC8211_INTR_STATUS = 26,
	VSC8211_AUX_CTRL_STAT = 28,
};

enum {
	VSC_INTR_RX_ERR = 1 << 0,
	VSC_INTR_MS_ERR = 1 << 1,	/* master/slave resolution error */
	VSC_INTR_CABLE = 1 << 2,	/* cable impairment */
	VSC_INTR_FALSE_CARR = 1 << 3,	/* false carrier */
	VSC_INTR_MEDIA_CHG = 1 << 4,	/* AMS media change */
	VSC_INTR_RX_FIFO = 1 << 5,	/* Rx FIFO over/underflow */
	VSC_INTR_TX_FIFO = 1 << 6,	/* Tx FIFO over/underflow */
	VSC_INTR_DESCRAMBL = 1 << 7,	/* descrambler lock-lost */
	VSC_INTR_SYMBOL_ERR = 1 << 8,	/* symbol error */
	VSC_INTR_NEG_DONE = 1 << 10,	/* autoneg done */
	VSC_INTR_NEG_ERR = 1 << 11,	/* autoneg error */
	VSC_INTR_LINK_CHG = 1 << 13,	/* link change */
	VSC_INTR_ENABLE = 1 << 15,	/* interrupt enable */
};

#define CFG_CHG_INTR_MASK (VSC_INTR_LINK_CHG | VSC_INTR_NEG_ERR | \
	 		   VSC_INTR_NEG_DONE)
#define INTR_MASK (CFG_CHG_INTR_MASK | VSC_INTR_TX_FIFO | VSC_INTR_RX_FIFO | \
		   VSC_INTR_ENABLE)

/* PHY specific auxiliary control & status register fields */
#define S_ACSR_ACTIPHY_TMR    0
#define M_ACSR_ACTIPHY_TMR    0x3
#define V_ACSR_ACTIPHY_TMR(x) ((x) << S_ACSR_ACTIPHY_TMR)

#define S_ACSR_SPEED    3
#define M_ACSR_SPEED    0x3
#define G_ACSR_SPEED(x) (((x) >> S_ACSR_SPEED) & M_ACSR_SPEED)

#define S_ACSR_DUPLEX 5
#define F_ACSR_DUPLEX (1 << S_ACSR_DUPLEX)

#define S_ACSR_ACTIPHY 6
#define F_ACSR_ACTIPHY (1 << S_ACSR_ACTIPHY)

/*
 * Reset the PHY.  This PHY completes reset immediately so we never wait.
 */
static int vsc8211_reset(struct cphy *cphy, int wait)
{
	return t3_phy_reset(cphy, 0, 0);
}

static int vsc8211_intr_enable(struct cphy *cphy)
{
	return mdio_write(cphy, 0, VSC8211_INTR_ENABLE, INTR_MASK);
}

static int vsc8211_intr_disable(struct cphy *cphy)
{
	return mdio_write(cphy, 0, VSC8211_INTR_ENABLE, 0);
}

static int vsc8211_intr_clear(struct cphy *cphy)
{
	u32 val;

	/* Clear PHY interrupts by reading the register. */
	return mdio_read(cphy, 0, VSC8211_INTR_STATUS, &val);
}

static int vsc8211_autoneg_enable(struct cphy *cphy)
{
	return t3_mdio_change_bits(cphy, 0, MII_BMCR, BMCR_PDOWN | BMCR_ISOLATE,
				   BMCR_ANENABLE | BMCR_ANRESTART);
}

static int vsc8211_autoneg_restart(struct cphy *cphy)
{
	return t3_mdio_change_bits(cphy, 0, MII_BMCR, BMCR_PDOWN | BMCR_ISOLATE,
				   BMCR_ANRESTART);
}

static int vsc8211_get_link_status(struct cphy *cphy, int *link_ok,
				   int *speed, int *duplex, int *fc)
{
	unsigned int bmcr, status, lpa, adv;
	int err, sp = -1, dplx = -1, pause = 0;

	err = mdio_read(cphy, 0, MII_BMCR, &bmcr);
	if (!err)
		err = mdio_read(cphy, 0, MII_BMSR, &status);
	if (err)
		return err;

	if (link_ok) {
		/*
		 * BMSR_LSTATUS is latch-low, so if it is 0 we need to read it
		 * once more to get the current link state.
		 */
		if (!(status & BMSR_LSTATUS))
			err = mdio_read(cphy, 0, MII_BMSR, &status);
		if (err)
			return err;
		*link_ok = (status & BMSR_LSTATUS) != 0;
	}
	if (!(bmcr & BMCR_ANENABLE)) {
		dplx = (bmcr & BMCR_FULLDPLX) ? DUPLEX_FULL : DUPLEX_HALF;
		if (bmcr & BMCR_SPEED1000)
			sp = SPEED_1000;
		else if (bmcr & BMCR_SPEED100)
			sp = SPEED_100;
		else
			sp = SPEED_10;
	} else if (status & BMSR_ANEGCOMPLETE) {
		err = mdio_read(cphy, 0, VSC8211_AUX_CTRL_STAT, &status);
		if (err)
			return err;

		dplx = (status & F_ACSR_DUPLEX) ? DUPLEX_FULL : DUPLEX_HALF;
		sp = G_ACSR_SPEED(status);
		if (sp == 0)
			sp = SPEED_10;
		else if (sp == 1)
			sp = SPEED_100;
		else
			sp = SPEED_1000;

		if (fc && dplx == DUPLEX_FULL) {
			err = mdio_read(cphy, 0, MII_LPA, &lpa);
			if (!err)
				err = mdio_read(cphy, 0, MII_ADVERTISE, &adv);
			if (err)
				return err;

			if (lpa & adv & ADVERTISE_PAUSE_CAP)
				pause = PAUSE_RX | PAUSE_TX;
			else if ((lpa & ADVERTISE_PAUSE_CAP) &&
				 (lpa & ADVERTISE_PAUSE_ASYM) &&
				 (adv & ADVERTISE_PAUSE_ASYM))
				pause = PAUSE_TX;
			else if ((lpa & ADVERTISE_PAUSE_ASYM) &&
				 (adv & ADVERTISE_PAUSE_CAP))
				pause = PAUSE_RX;
		}
	}
	if (speed)
		*speed = sp;
	if (duplex)
		*duplex = dplx;
	if (fc)
		*fc = pause;
	return 0;
}

static int vsc8211_power_down(struct cphy *cphy, int enable)
{
	return t3_mdio_change_bits(cphy, 0, MII_BMCR, BMCR_PDOWN,
				   enable ? BMCR_PDOWN : 0);
}

static int vsc8211_intr_handler(struct cphy *cphy)
{
	unsigned int cause;
	int err, cphy_cause = 0;

	err = mdio_read(cphy, 0, VSC8211_INTR_STATUS, &cause);
	if (err)
		return err;

	cause &= INTR_MASK;
	if (cause & CFG_CHG_INTR_MASK)
		cphy_cause |= cphy_cause_link_change;
	if (cause & (VSC_INTR_RX_FIFO | VSC_INTR_TX_FIFO))
		cphy_cause |= cphy_cause_fifo_error;
	return cphy_cause;
}

static struct cphy_ops vsc8211_ops = {
	.reset = vsc8211_reset,
	.intr_enable = vsc8211_intr_enable,
	.intr_disable = vsc8211_intr_disable,
	.intr_clear = vsc8211_intr_clear,
	.intr_handler = vsc8211_intr_handler,
	.autoneg_enable = vsc8211_autoneg_enable,
	.autoneg_restart = vsc8211_autoneg_restart,
	.advertise = t3_phy_advertise,
	.set_speed_duplex = t3_set_phy_speed_duplex,
	.get_link_status = vsc8211_get_link_status,
	.power_down = vsc8211_power_down,
};

void t3_vsc8211_phy_prep(struct cphy *phy, struct adapter *adapter,
			 int phy_addr, const struct mdio_ops *mdio_ops)
{
	cphy_init(phy, adapter, phy_addr, &vsc8211_ops, mdio_ops);
}