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Commit 31dd83b9 authored by Michael Schmitz's avatar Michael Schmitz Committed by David S. Miller
Browse files

net-next: phy: new Asix Electronics PHY driver 



The Asix Electronics PHY found on the X-Surf 100 Amiga Zorro network
card by Individual Computers is buggy, and needs the reset bit toggled
as workaround to make a PHY soft reset succeed.

Add workaround driver just for this special case.

Suggested in xsurf100 patch series review by Andrew Lunn <andrew@lunn.ch>

Signed-off-by: default avatarMichael Schmitz <schmitzmic@gmail.com>
Reviewed-by: default avatarAndrew Lunn <andrew@lunn.ch>
Reviewed-by: default avatarFlorian Fainelli <f.fainelli@gmail.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent 32e43779

drivers/net/phy/Kconfig

+6 −0
Original line number Diff line number Diff line
@@ -218,6 +218,12 @@ config AQUANTIA_PHY 
	---help---

	  Currently supports the Aquantia AQ1202, AQ2104, AQR105, AQR405



config ASIX_PHY

	tristate "Asix PHYs"

	help

	  Currently supports the Asix Electronics PHY found in the X-Surf 100

	  AX88796B package.



config AT803X_PHY

	tristate "AT803X PHYs"

	---help---

drivers/net/phy/Makefile

+1 −0
Original line number Diff line number Diff line
@@ -45,6 +45,7 @@ obj-y += $(sfp-obj-y) $(sfp-obj-m) 


obj-$(CONFIG_AMD_PHY)		+= amd.o

obj-$(CONFIG_AQUANTIA_PHY)	+= aquantia.o

obj-$(CONFIG_ASIX_PHY)		+= asix.o

obj-$(CONFIG_AT803X_PHY)	+= at803x.o

obj-$(CONFIG_BCM63XX_PHY)	+= bcm63xx.o

obj-$(CONFIG_BCM7XXX_PHY)	+= bcm7xxx.o

drivers/net/phy/asix.c

0 → 100644
+63 −0
Original line number Diff line number Diff line 
// SPDX-License-Identifier: GPL-2.0

/* Driver for Asix PHYs

 *

 * Author: Michael Schmitz <schmitzmic@gmail.com>

 *

 * This program is free software; you can redistribute  it and/or modify it

 * under  the terms of  the GNU General  Public License as published by the

 * Free Software Foundation;  either version 2 of the  License, or (at your

 * option) any later version.

 *

 */

#include <linux/kernel.h>

#include <linux/errno.h>

#include <linux/init.h>

#include <linux/module.h>

#include <linux/mii.h>

#include <linux/phy.h>



#define PHY_ID_ASIX_AX88796B		0x003b1841



MODULE_DESCRIPTION("Asix PHY driver");

MODULE_AUTHOR("Michael Schmitz <schmitzmic@gmail.com>");

MODULE_LICENSE("GPL");



/**

 * asix_soft_reset - software reset the PHY via BMCR_RESET bit

 * @phydev: target phy_device struct

 *

 * Description: Perform a software PHY reset using the standard

 * BMCR_RESET bit and poll for the reset bit to be cleared.

 * Toggle BMCR_RESET bit off to accommodate broken AX8796B PHY implementation

 * such as used on the Individual Computers' X-Surf 100 Zorro card.

 *

 * Returns: 0 on success, < 0 on failure

 */

static int asix_soft_reset(struct phy_device *phydev)

{

	int ret;



	/* Asix PHY won't reset unless reset bit toggles */

	ret = phy_write(phydev, MII_BMCR, 0);

	if (ret < 0)

		return ret;



	return genphy_soft_reset(phydev);

}



static struct phy_driver asix_driver[] = { {

	.phy_id		= PHY_ID_ASIX_AX88796B,

	.name		= "Asix Electronics AX88796B",

	.phy_id_mask	= 0xfffffff0,

	.features	= PHY_BASIC_FEATURES,

	.soft_reset	= asix_soft_reset,

} };



module_phy_driver(asix_driver);



static struct mdio_device_id __maybe_unused asix_tbl[] = {

	{ PHY_ID_ASIX_AX88796B, 0xfffffff0 },

	{ }

};



MODULE_DEVICE_TABLE(mdio, asix_tbl);