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955e16026d
With RGMII, we need a 1.5 to 2ns skew between clock and data lines. The VSC8601 can handle this internally. While the VSC8601 can set more fine-grained delays, the standard skew settings work out of the box. The same heuristic is used to determine when this skew should be enabled as in vsc824x_config_init(). Tested on custom board with AM3352 SOC and VSC801 PHY. Signed-off-by: Alexandru Gagniuc <alex.g@adaptrum.com> Signed-off-by: David S. Miller <davem@davemloft.net>
366 lines
10 KiB
C
366 lines
10 KiB
C
/*
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* Driver for Vitesse PHYs
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*
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* Author: Kriston Carson
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*
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* Copyright (c) 2005, 2009, 2011 Freescale Semiconductor, Inc.
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License 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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*/
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/mii.h>
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#include <linux/ethtool.h>
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#include <linux/phy.h>
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/* Vitesse Extended Page Magic Register(s) */
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#define MII_VSC82X4_EXT_PAGE_16E 0x10
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#define MII_VSC82X4_EXT_PAGE_17E 0x11
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#define MII_VSC82X4_EXT_PAGE_18E 0x12
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/* Vitesse Extended Control Register 1 */
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#define MII_VSC8244_EXT_CON1 0x17
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#define MII_VSC8244_EXTCON1_INIT 0x0000
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#define MII_VSC8244_EXTCON1_TX_SKEW_MASK 0x0c00
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#define MII_VSC8244_EXTCON1_RX_SKEW_MASK 0x0300
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#define MII_VSC8244_EXTCON1_TX_SKEW 0x0800
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#define MII_VSC8244_EXTCON1_RX_SKEW 0x0200
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/* Vitesse Interrupt Mask Register */
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#define MII_VSC8244_IMASK 0x19
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#define MII_VSC8244_IMASK_IEN 0x8000
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#define MII_VSC8244_IMASK_SPEED 0x4000
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#define MII_VSC8244_IMASK_LINK 0x2000
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#define MII_VSC8244_IMASK_DUPLEX 0x1000
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#define MII_VSC8244_IMASK_MASK 0xf000
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#define MII_VSC8221_IMASK_MASK 0xa000
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/* Vitesse Interrupt Status Register */
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#define MII_VSC8244_ISTAT 0x1a
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#define MII_VSC8244_ISTAT_STATUS 0x8000
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#define MII_VSC8244_ISTAT_SPEED 0x4000
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#define MII_VSC8244_ISTAT_LINK 0x2000
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#define MII_VSC8244_ISTAT_DUPLEX 0x1000
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/* Vitesse Auxiliary Control/Status Register */
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#define MII_VSC8244_AUX_CONSTAT 0x1c
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#define MII_VSC8244_AUXCONSTAT_INIT 0x0000
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#define MII_VSC8244_AUXCONSTAT_DUPLEX 0x0020
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#define MII_VSC8244_AUXCONSTAT_SPEED 0x0018
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#define MII_VSC8244_AUXCONSTAT_GBIT 0x0010
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#define MII_VSC8244_AUXCONSTAT_100 0x0008
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#define MII_VSC8221_AUXCONSTAT_INIT 0x0004 /* need to set this bit? */
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#define MII_VSC8221_AUXCONSTAT_RESERVED 0x0004
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/* Vitesse Extended Page Access Register */
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#define MII_VSC82X4_EXT_PAGE_ACCESS 0x1f
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/* Vitesse VSC8601 Extended PHY Control Register 1 */
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#define MII_VSC8601_EPHY_CTL 0x17
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#define MII_VSC8601_EPHY_CTL_RGMII_SKEW (1 << 8)
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#define PHY_ID_VSC8234 0x000fc620
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#define PHY_ID_VSC8244 0x000fc6c0
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#define PHY_ID_VSC8514 0x00070670
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#define PHY_ID_VSC8574 0x000704a0
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#define PHY_ID_VSC8601 0x00070420
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#define PHY_ID_VSC8662 0x00070660
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#define PHY_ID_VSC8221 0x000fc550
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#define PHY_ID_VSC8211 0x000fc4b0
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MODULE_DESCRIPTION("Vitesse PHY driver");
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MODULE_AUTHOR("Kriston Carson");
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MODULE_LICENSE("GPL");
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static int vsc824x_add_skew(struct phy_device *phydev)
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{
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int err;
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int extcon;
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extcon = phy_read(phydev, MII_VSC8244_EXT_CON1);
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if (extcon < 0)
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return extcon;
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extcon &= ~(MII_VSC8244_EXTCON1_TX_SKEW_MASK |
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MII_VSC8244_EXTCON1_RX_SKEW_MASK);
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extcon |= (MII_VSC8244_EXTCON1_TX_SKEW |
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MII_VSC8244_EXTCON1_RX_SKEW);
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err = phy_write(phydev, MII_VSC8244_EXT_CON1, extcon);
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return err;
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}
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static int vsc824x_config_init(struct phy_device *phydev)
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{
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int err;
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err = phy_write(phydev, MII_VSC8244_AUX_CONSTAT,
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MII_VSC8244_AUXCONSTAT_INIT);
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if (err < 0)
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return err;
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if (phydev->interface == PHY_INTERFACE_MODE_RGMII_ID)
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err = vsc824x_add_skew(phydev);
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return err;
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}
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/* This adds a skew for both TX and RX clocks, so the skew should only be
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* applied to "rgmii-id" interfaces. It may not work as expected
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* on "rgmii-txid", "rgmii-rxid" or "rgmii" interfaces. */
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static int vsc8601_add_skew(struct phy_device *phydev)
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{
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int ret;
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ret = phy_read(phydev, MII_VSC8601_EPHY_CTL);
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if (ret < 0)
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return ret;
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ret |= MII_VSC8601_EPHY_CTL_RGMII_SKEW;
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return phy_write(phydev, MII_VSC8601_EPHY_CTL, ret);
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}
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static int vsc8601_config_init(struct phy_device *phydev)
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{
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int ret = 0;
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if (phydev->interface == PHY_INTERFACE_MODE_RGMII_ID)
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ret = vsc8601_add_skew(phydev);
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if (ret < 0)
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return ret;
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return genphy_config_init(phydev);
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}
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static int vsc824x_ack_interrupt(struct phy_device *phydev)
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{
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int err = 0;
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/* Don't bother to ACK the interrupts if interrupts
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* are disabled. The 824x cannot clear the interrupts
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* if they are disabled.
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*/
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if (phydev->interrupts == PHY_INTERRUPT_ENABLED)
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err = phy_read(phydev, MII_VSC8244_ISTAT);
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return (err < 0) ? err : 0;
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}
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static int vsc82xx_config_intr(struct phy_device *phydev)
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{
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int err;
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if (phydev->interrupts == PHY_INTERRUPT_ENABLED)
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err = phy_write(phydev, MII_VSC8244_IMASK,
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(phydev->drv->phy_id == PHY_ID_VSC8234 ||
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phydev->drv->phy_id == PHY_ID_VSC8244 ||
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phydev->drv->phy_id == PHY_ID_VSC8514 ||
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phydev->drv->phy_id == PHY_ID_VSC8574 ||
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phydev->drv->phy_id == PHY_ID_VSC8601) ?
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MII_VSC8244_IMASK_MASK :
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MII_VSC8221_IMASK_MASK);
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else {
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/* The Vitesse PHY cannot clear the interrupt
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* once it has disabled them, so we clear them first
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*/
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err = phy_read(phydev, MII_VSC8244_ISTAT);
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if (err < 0)
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return err;
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err = phy_write(phydev, MII_VSC8244_IMASK, 0);
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}
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return err;
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}
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static int vsc8221_config_init(struct phy_device *phydev)
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{
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int err;
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err = phy_write(phydev, MII_VSC8244_AUX_CONSTAT,
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MII_VSC8221_AUXCONSTAT_INIT);
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return err;
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/* Perhaps we should set EXT_CON1 based on the interface?
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* Options are 802.3Z SerDes or SGMII
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*/
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}
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/* vsc82x4_config_autocross_enable - Enable auto MDI/MDI-X for forced links
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* @phydev: target phy_device struct
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*
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* Enable auto MDI/MDI-X when in 10/100 forced link speeds by writing
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* special values in the VSC8234/VSC8244 extended reserved registers
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*/
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static int vsc82x4_config_autocross_enable(struct phy_device *phydev)
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{
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int ret;
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if (phydev->autoneg == AUTONEG_ENABLE || phydev->speed > SPEED_100)
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return 0;
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/* map extended registers set 0x10 - 0x1e */
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ret = phy_write(phydev, MII_VSC82X4_EXT_PAGE_ACCESS, 0x52b5);
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if (ret >= 0)
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ret = phy_write(phydev, MII_VSC82X4_EXT_PAGE_18E, 0x0012);
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if (ret >= 0)
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ret = phy_write(phydev, MII_VSC82X4_EXT_PAGE_17E, 0x2803);
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if (ret >= 0)
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ret = phy_write(phydev, MII_VSC82X4_EXT_PAGE_16E, 0x87fa);
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/* map standard registers set 0x10 - 0x1e */
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if (ret >= 0)
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ret = phy_write(phydev, MII_VSC82X4_EXT_PAGE_ACCESS, 0x0000);
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else
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phy_write(phydev, MII_VSC82X4_EXT_PAGE_ACCESS, 0x0000);
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return ret;
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}
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/* vsc82x4_config_aneg - restart auto-negotiation or write BMCR
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* @phydev: target phy_device struct
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*
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* Description: If auto-negotiation is enabled, we configure the
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* advertising, and then restart auto-negotiation. If it is not
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* enabled, then we write the BMCR and also start the auto
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* MDI/MDI-X feature
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*/
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static int vsc82x4_config_aneg(struct phy_device *phydev)
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{
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int ret;
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/* Enable auto MDI/MDI-X when in 10/100 forced link speeds by
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* writing special values in the VSC8234 extended reserved registers
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*/
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if (phydev->autoneg != AUTONEG_ENABLE && phydev->speed <= SPEED_100) {
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ret = genphy_setup_forced(phydev);
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if (ret < 0) /* error */
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return ret;
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return vsc82x4_config_autocross_enable(phydev);
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}
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return genphy_config_aneg(phydev);
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}
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/* Vitesse 82xx */
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static struct phy_driver vsc82xx_driver[] = {
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{
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.phy_id = PHY_ID_VSC8234,
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.name = "Vitesse VSC8234",
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.phy_id_mask = 0x000ffff0,
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.features = PHY_GBIT_FEATURES,
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.flags = PHY_HAS_INTERRUPT,
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.config_init = &vsc824x_config_init,
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.config_aneg = &vsc82x4_config_aneg,
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.read_status = &genphy_read_status,
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.ack_interrupt = &vsc824x_ack_interrupt,
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.config_intr = &vsc82xx_config_intr,
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}, {
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.phy_id = PHY_ID_VSC8244,
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.name = "Vitesse VSC8244",
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.phy_id_mask = 0x000fffc0,
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.features = PHY_GBIT_FEATURES,
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.flags = PHY_HAS_INTERRUPT,
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.config_init = &vsc824x_config_init,
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.config_aneg = &vsc82x4_config_aneg,
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.read_status = &genphy_read_status,
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.ack_interrupt = &vsc824x_ack_interrupt,
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.config_intr = &vsc82xx_config_intr,
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}, {
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.phy_id = PHY_ID_VSC8514,
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.name = "Vitesse VSC8514",
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.phy_id_mask = 0x000ffff0,
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.features = PHY_GBIT_FEATURES,
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.flags = PHY_HAS_INTERRUPT,
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.config_init = &vsc824x_config_init,
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.config_aneg = &vsc82x4_config_aneg,
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.read_status = &genphy_read_status,
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.ack_interrupt = &vsc824x_ack_interrupt,
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.config_intr = &vsc82xx_config_intr,
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}, {
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.phy_id = PHY_ID_VSC8574,
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.name = "Vitesse VSC8574",
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.phy_id_mask = 0x000ffff0,
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.features = PHY_GBIT_FEATURES,
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.flags = PHY_HAS_INTERRUPT,
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.config_init = &vsc824x_config_init,
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.config_aneg = &vsc82x4_config_aneg,
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.read_status = &genphy_read_status,
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.ack_interrupt = &vsc824x_ack_interrupt,
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.config_intr = &vsc82xx_config_intr,
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}, {
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.phy_id = PHY_ID_VSC8601,
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.name = "Vitesse VSC8601",
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.phy_id_mask = 0x000ffff0,
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.features = PHY_GBIT_FEATURES,
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.flags = PHY_HAS_INTERRUPT,
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.config_init = &vsc8601_config_init,
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.config_aneg = &genphy_config_aneg,
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.read_status = &genphy_read_status,
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.ack_interrupt = &vsc824x_ack_interrupt,
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.config_intr = &vsc82xx_config_intr,
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}, {
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.phy_id = PHY_ID_VSC8662,
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.name = "Vitesse VSC8662",
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.phy_id_mask = 0x000ffff0,
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.features = PHY_GBIT_FEATURES,
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.flags = PHY_HAS_INTERRUPT,
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.config_init = &vsc824x_config_init,
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.config_aneg = &vsc82x4_config_aneg,
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.read_status = &genphy_read_status,
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.ack_interrupt = &vsc824x_ack_interrupt,
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.config_intr = &vsc82xx_config_intr,
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}, {
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/* Vitesse 8221 */
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.phy_id = PHY_ID_VSC8221,
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.phy_id_mask = 0x000ffff0,
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.name = "Vitesse VSC8221",
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.features = PHY_GBIT_FEATURES,
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.flags = PHY_HAS_INTERRUPT,
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.config_init = &vsc8221_config_init,
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.config_aneg = &genphy_config_aneg,
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.read_status = &genphy_read_status,
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.ack_interrupt = &vsc824x_ack_interrupt,
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.config_intr = &vsc82xx_config_intr,
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}, {
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/* Vitesse 8211 */
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.phy_id = PHY_ID_VSC8211,
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.phy_id_mask = 0x000ffff0,
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.name = "Vitesse VSC8211",
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.features = PHY_GBIT_FEATURES,
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.flags = PHY_HAS_INTERRUPT,
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.config_init = &vsc8221_config_init,
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.config_aneg = &genphy_config_aneg,
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.read_status = &genphy_read_status,
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.ack_interrupt = &vsc824x_ack_interrupt,
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.config_intr = &vsc82xx_config_intr,
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} };
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module_phy_driver(vsc82xx_driver);
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static struct mdio_device_id __maybe_unused vitesse_tbl[] = {
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{ PHY_ID_VSC8234, 0x000ffff0 },
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{ PHY_ID_VSC8244, 0x000fffc0 },
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{ PHY_ID_VSC8514, 0x000ffff0 },
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{ PHY_ID_VSC8574, 0x000ffff0 },
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{ PHY_ID_VSC8662, 0x000ffff0 },
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{ PHY_ID_VSC8221, 0x000ffff0 },
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{ PHY_ID_VSC8211, 0x000ffff0 },
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{ }
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};
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MODULE_DEVICE_TABLE(mdio, vitesse_tbl);
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