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181 lines
4.3 KiB
181 lines
4.3 KiB
// 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 <[email protected]> |
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* Maintainer: Giuseppe Cavallaro <[email protected]> |
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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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