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net-next: phy: new Asix Electronics PHY driver

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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: Michael Schmitz <schmitzmic@gmail.com>
Reviewed-by: Andrew Lunn <andrew@lunn.ch>
Reviewed-by: Florian Fainelli <f.fainelli@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Michael Schmitz 2018-04-19 14:05:18 +12:00 committed by David S. Miller
parent 32e43779fc
commit 31dd83b966
3 changed files with 70 additions and 0 deletions
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6
drivers/net/phy/Kconfig
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@ -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---

1
drivers/net/phy/Makefile
View File

@ -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

63
drivers/net/phy/asix.c Normal file
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@ -0,0 +1,63 @@
// 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);