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