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// SPDX-License-Identifier: GPL-2.0+
/*
* drivers/net/phy/national.c
*
* Driver for National Semiconductor PHYs
*
* Author: Stuart Menefy <stuart.menefy@st.com>
* Maintainer: Giuseppe Cavallaro <peppe.cavallaro@st.com>
*
* Copyright (c) 2008 STMicroelectronics Limited
*/
#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/mii.h>
#include <linux/ethtool.h>
#include <linux/phy.h>
#include <linux/netdevice.h>
#define DEBUG
/* DP83865 phy identifier values */
#define DP83865_PHY_ID 0x20005c7a
#define DP83865_INT_STATUS 0x14
#define DP83865_INT_MASK 0x15
#define DP83865_INT_CLEAR 0x17
#define DP83865_INT_REMOTE_FAULT 0x0008
#define DP83865_INT_ANE_COMPLETED 0x0010
#define DP83865_INT_LINK_CHANGE 0xe000
#define DP83865_INT_MASK_DEFAULT (DP83865_INT_REMOTE_FAULT | \
DP83865_INT_ANE_COMPLETED | \
DP83865_INT_LINK_CHANGE)
/* Advanced proprietary configuration */
#define NS_EXP_MEM_CTL 0x16
#define NS_EXP_MEM_DATA 0x1d
#define NS_EXP_MEM_ADD 0x1e
#define LED_CTRL_REG 0x13
#define AN_FALLBACK_AN 0x0001
#define AN_FALLBACK_CRC 0x0002
#define AN_FALLBACK_IE 0x0004
#define ALL_FALLBACK_ON (AN_FALLBACK_AN | AN_FALLBACK_CRC | AN_FALLBACK_IE)
enum hdx_loopback {
hdx_loopback_on = 0,
hdx_loopback_off = 1,
};
static u8 ns_exp_read(struct phy_device *phydev, u16 reg)
{
phy_write(phydev, NS_EXP_MEM_ADD, reg);
return phy_read(phydev, NS_EXP_MEM_DATA);
}
static void ns_exp_write(struct phy_device *phydev, u16 reg, u8 data)
{
phy_write(phydev, NS_EXP_MEM_ADD, reg);
phy_write(phydev, NS_EXP_MEM_DATA, data);
}
static int ns_ack_interrupt(struct phy_device *phydev)
{
int ret = phy_read(phydev, DP83865_INT_STATUS);
if (ret < 0)
return ret;
/* Clear the interrupt status bit by writing a “1”
* to the corresponding bit in INT_CLEAR (2:0 are reserved) */
ret = phy_write(phydev, DP83865_INT_CLEAR, ret & ~0x7);
return ret;
}
static irqreturn_t ns_handle_interrupt(struct phy_device *phydev)
{
int irq_status;
irq_status = phy_read(phydev, DP83865_INT_STATUS);
if (irq_status < 0) {
phy_error(phydev);
return IRQ_NONE;
}
if (!(irq_status & DP83865_INT_MASK_DEFAULT))
return IRQ_NONE;
/* clear the interrupt */
phy_write(phydev, DP83865_INT_CLEAR, irq_status & ~0x7);
phy_trigger_machine(phydev);
return IRQ_HANDLED;
}
static int ns_config_intr(struct phy_device *phydev)
{
int err;
if (phydev->interrupts == PHY_INTERRUPT_ENABLED) {
err = ns_ack_interrupt(phydev);
if (err)
return err;
err = phy_write(phydev, DP83865_INT_MASK,
DP83865_INT_MASK_DEFAULT);
} else {
err = phy_write(phydev, DP83865_INT_MASK, 0);
if (err)
return err;
err = ns_ack_interrupt(phydev);
}
return err;
}
static void ns_giga_speed_fallback(struct phy_device *phydev, int mode)
{
int bmcr = phy_read(phydev, MII_BMCR);
phy_write(phydev, MII_BMCR, (bmcr | BMCR_PDOWN));
/* Enable 8 bit expended memory read/write (no auto increment) */
phy_write(phydev, NS_EXP_MEM_CTL, 0);
phy_write(phydev, NS_EXP_MEM_ADD, 0x1C0);
phy_write(phydev, NS_EXP_MEM_DATA, 0x0008);
phy_write(phydev, MII_BMCR, (bmcr & ~BMCR_PDOWN));
phy_write(phydev, LED_CTRL_REG, mode);
}
static void ns_10_base_t_hdx_loopack(struct phy_device *phydev, int disable)
{
u16 lb_dis = BIT(1);
if (disable)
ns_exp_write(phydev, 0x1c0,
ns_exp_read(phydev, 0x1c0) | lb_dis);
else
ns_exp_write(phydev, 0x1c0,
ns_exp_read(phydev, 0x1c0) & ~lb_dis);
pr_debug("10BASE-T HDX loopback %s\n",
(ns_exp_read(phydev, 0x1c0) & lb_dis) ? "off" : "on");
}
static int ns_config_init(struct phy_device *phydev)
{
ns_giga_speed_fallback(phydev, ALL_FALLBACK_ON);
/* In the latest MAC or switches design, the 10 Mbps loopback
is desired to be turned off. */
ns_10_base_t_hdx_loopack(phydev, hdx_loopback_off);
return ns_ack_interrupt(phydev);
}
static struct phy_driver dp83865_driver[] = { {
.phy_id = DP83865_PHY_ID,
.phy_id_mask = 0xfffffff0,
.name = "NatSemi DP83865",
/* PHY_GBIT_FEATURES */
.config_init = ns_config_init,
.config_intr = ns_config_intr,
.handle_interrupt = ns_handle_interrupt,
} };
module_phy_driver(dp83865_driver);
MODULE_DESCRIPTION("NatSemi PHY driver");
MODULE_AUTHOR("Stuart Menefy");
MODULE_LICENSE("GPL");
static struct mdio_device_id __maybe_unused ns_tbl[] = {
{ DP83865_PHY_ID, 0xfffffff0 },
{ }
};
MODULE_DEVICE_TABLE(mdio, ns_tbl);
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