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/*
* Copyright (C) 2015 Microchip Technology
*
* 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.
*
* 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
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, see <http://www.gnu.org/licenses/>.
*/
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/mii.h>
#include <linux/ethtool.h>
#include <linux/phy.h>
#include <linux/microchipphy.h>
#include <linux/of.h>
#include <dt-bindings/net/microchip-lan78xx.h>
#define DRIVER_AUTHOR "WOOJUNG HUH <woojung.huh@microchip.com>"
#define DRIVER_DESC "Microchip LAN88XX PHY driver"
struct lan88xx_priv {
int chip_id;
int chip_rev;
__u32 wolopts;
};
static int lan88xx_phy_config_intr(struct phy_device *phydev)
{
int rc;
if (phydev->interrupts == PHY_INTERRUPT_ENABLED) {
/* unmask all source and clear them before enable */
rc = phy_write(phydev, LAN88XX_INT_MASK, 0x7FFF);
rc = phy_read(phydev, LAN88XX_INT_STS);
rc = phy_write(phydev, LAN88XX_INT_MASK,
LAN88XX_INT_MASK_MDINTPIN_EN_ |
LAN88XX_INT_MASK_LINK_CHANGE_);
} else {
rc = phy_write(phydev, LAN88XX_INT_MASK, 0);
}
return rc < 0 ? rc : 0;
}
static int lan88xx_phy_ack_interrupt(struct phy_device *phydev)
{
int rc = phy_read(phydev, LAN88XX_INT_STS);
return rc < 0 ? rc : 0;
}
static int lan88xx_suspend(struct phy_device *phydev)
{
struct lan88xx_priv *priv = phydev->priv;
/* do not power down PHY when WOL is enabled */
if (!priv->wolopts)
genphy_suspend(phydev);
return 0;
}
static int lan88xx_probe(struct phy_device *phydev)
{
struct device *dev = &phydev->mdio.dev;
struct lan88xx_priv *priv;
u32 led_modes[4];
int len;
priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
if (!priv)
return -ENOMEM;
priv->wolopts = 0;
len = of_property_read_variable_u32_array(dev->of_node,
"microchip,led-modes",
led_modes,
0,
ARRAY_SIZE(led_modes));
if (len >= 0) {
u32 reg = 0;
int i;
for (i = 0; i < len; i++) {
if (led_modes[i] > 15)
return -EINVAL;
reg |= led_modes[i] << (i * 4);
}
for (; i < ARRAY_SIZE(led_modes); i++)
reg |= LAN78XX_FORCE_LED_OFF << (i * 4);
(void)phy_write(phydev, LAN78XX_PHY_LED_MODE_SELECT, reg);
} else if (len == -EOVERFLOW) {
return -EINVAL;
}
/* these values can be used to identify internal PHY */
priv->chip_id = phy_read_mmd(phydev, 3, LAN88XX_MMD3_CHIP_ID);
priv->chip_rev = phy_read_mmd(phydev, 3, LAN88XX_MMD3_CHIP_REV);
phydev->priv = priv;
return 0;
}
static void lan88xx_remove(struct phy_device *phydev)
{
struct device *dev = &phydev->mdio.dev;
struct lan88xx_priv *priv = phydev->priv;
if (priv)
devm_kfree(dev, priv);
}
static int lan88xx_set_wol(struct phy_device *phydev,
struct ethtool_wolinfo *wol)
{
struct lan88xx_priv *priv = phydev->priv;
priv->wolopts = wol->wolopts;
return 0;
}
static void lan88xx_set_mdix(struct phy_device *phydev)
{
int buf;
int val;
switch (phydev->mdix_ctrl) {
case ETH_TP_MDI:
val = LAN88XX_EXT_MODE_CTRL_MDI_;
break;
case ETH_TP_MDI_X:
val = LAN88XX_EXT_MODE_CTRL_MDI_X_;
break;
case ETH_TP_MDI_AUTO:
val = LAN88XX_EXT_MODE_CTRL_AUTO_MDIX_;
break;
default:
return;
}
phy_write(phydev, LAN88XX_EXT_PAGE_ACCESS, LAN88XX_EXT_PAGE_SPACE_1);
buf = phy_read(phydev, LAN88XX_EXT_MODE_CTRL);
buf &= ~LAN88XX_EXT_MODE_CTRL_MDIX_MASK_;
buf |= val;
phy_write(phydev, LAN88XX_EXT_MODE_CTRL, buf);
phy_write(phydev, LAN88XX_EXT_PAGE_ACCESS, LAN88XX_EXT_PAGE_SPACE_0);
}
static int lan88xx_config_aneg(struct phy_device *phydev)
{
lan88xx_set_mdix(phydev);
return genphy_config_aneg(phydev);
}
static struct phy_driver microchip_phy_driver[] = {
{
.phy_id = 0x0007c130,
.phy_id_mask = 0xfffffff0,
.name = "Microchip LAN88xx",
.features = PHY_GBIT_FEATURES,
.flags = PHY_HAS_INTERRUPT,
.probe = lan88xx_probe,
.remove = lan88xx_remove,
.config_init = genphy_config_init,
.config_aneg = lan88xx_config_aneg,
.ack_interrupt = lan88xx_phy_ack_interrupt,
.config_intr = lan88xx_phy_config_intr,
.suspend = lan88xx_suspend,
.resume = genphy_resume,
.set_wol = lan88xx_set_wol,
} };
module_phy_driver(microchip_phy_driver);
static struct mdio_device_id __maybe_unused microchip_tbl[] = {
{ 0x0007c130, 0xfffffff0 },
{ }
};
MODULE_DEVICE_TABLE(mdio, microchip_tbl);
MODULE_AUTHOR(DRIVER_AUTHOR);
MODULE_DESCRIPTION(DRIVER_DESC);
MODULE_LICENSE("GPL");
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