![Andrew Victor](/assets/img/avatar_default.png)
This patch adds support for the Ethernet controller integrated in the Atmel AT91RM9200 SoC processor. Changes since the previous submission (01/02/2006) are: - Make use of the clk.h clock infrastructure. - The multicast hash function is not crc32. [Patch by Pedro Perez] Signed-off-by: Andrew Victor <andrew@sanpeople.com> Signed-off-by: Jeff Garzik <jeff@garzik.org>
1111 lines
33 KiB
C
1111 lines
33 KiB
C
/*
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* Ethernet driver for the Atmel AT91RM9200 (Thunder)
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*
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* Copyright (C) 2003 SAN People (Pty) Ltd
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*
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* Based on an earlier Atmel EMAC macrocell driver by Atmel and Lineo Inc.
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* Initial version by Rick Bronson 01/11/2003
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*
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* Intel LXT971A PHY support by Christopher Bahns & David Knickerbocker
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* (Polaroid Corporation)
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*
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* Realtek RTL8201(B)L PHY support by Roman Avramenko <roman@imsystems.ru>
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version
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* 2 of the License, or (at your option) any later version.
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*/
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#include <linux/module.h>
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#include <linux/init.h>
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#include <linux/config.h>
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#include <linux/mii.h>
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#include <linux/netdevice.h>
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#include <linux/etherdevice.h>
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#include <linux/skbuff.h>
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#include <linux/dma-mapping.h>
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#include <linux/ethtool.h>
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#include <linux/platform_device.h>
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#include <linux/clk.h>
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#include <asm/io.h>
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#include <asm/uaccess.h>
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#include <asm/mach-types.h>
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#include <asm/arch/at91rm9200_emac.h>
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#include <asm/arch/gpio.h>
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#include <asm/arch/board.h>
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#include "at91_ether.h"
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#define DRV_NAME "at91_ether"
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#define DRV_VERSION "1.0"
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static struct net_device *at91_dev;
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static struct clk *ether_clk;
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/* ..................................................................... */
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/*
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* Read from a EMAC register.
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*/
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static inline unsigned long at91_emac_read(unsigned int reg)
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{
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void __iomem *emac_base = (void __iomem *)AT91_VA_BASE_EMAC;
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return __raw_readl(emac_base + reg);
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}
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/*
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* Write to a EMAC register.
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*/
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static inline void at91_emac_write(unsigned int reg, unsigned long value)
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{
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void __iomem *emac_base = (void __iomem *)AT91_VA_BASE_EMAC;
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__raw_writel(value, emac_base + reg);
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}
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/* ........................... PHY INTERFACE ........................... */
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/*
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* Enable the MDIO bit in MAC control register
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* When not called from an interrupt-handler, access to the PHY must be
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* protected by a spinlock.
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*/
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static void enable_mdi(void)
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{
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unsigned long ctl;
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ctl = at91_emac_read(AT91_EMAC_CTL);
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at91_emac_write(AT91_EMAC_CTL, ctl | AT91_EMAC_MPE); /* enable management port */
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}
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/*
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* Disable the MDIO bit in the MAC control register
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*/
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static void disable_mdi(void)
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{
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unsigned long ctl;
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ctl = at91_emac_read(AT91_EMAC_CTL);
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at91_emac_write(AT91_EMAC_CTL, ctl & ~AT91_EMAC_MPE); /* disable management port */
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}
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/*
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* Wait until the PHY operation is complete.
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*/
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static inline void at91_phy_wait(void) {
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unsigned long timeout = jiffies + 2;
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while (!(at91_emac_read(AT91_EMAC_SR) & AT91_EMAC_SR_IDLE)) {
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if (time_after(jiffies, timeout)) {
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printk("at91_ether: MIO timeout\n");
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break;
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}
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cpu_relax();
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}
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}
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/*
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* Write value to the a PHY register
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* Note: MDI interface is assumed to already have been enabled.
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*/
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static void write_phy(unsigned char phy_addr, unsigned char address, unsigned int value)
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{
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at91_emac_write(AT91_EMAC_MAN, AT91_EMAC_MAN_802_3 | AT91_EMAC_RW_W
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| ((phy_addr & 0x1f) << 23) | (address << 18) | (value & AT91_EMAC_DATA));
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/* Wait until IDLE bit in Network Status register is cleared */
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at91_phy_wait();
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}
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/*
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* Read value stored in a PHY register.
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* Note: MDI interface is assumed to already have been enabled.
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*/
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static void read_phy(unsigned char phy_addr, unsigned char address, unsigned int *value)
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{
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at91_emac_write(AT91_EMAC_MAN, AT91_EMAC_MAN_802_3 | AT91_EMAC_RW_R
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| ((phy_addr & 0x1f) << 23) | (address << 18));
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/* Wait until IDLE bit in Network Status register is cleared */
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at91_phy_wait();
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*value = at91_emac_read(AT91_EMAC_MAN) & AT91_EMAC_DATA;
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}
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/* ........................... PHY MANAGEMENT .......................... */
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/*
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* Access the PHY to determine the current link speed and mode, and update the
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* MAC accordingly.
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* If no link or auto-negotiation is busy, then no changes are made.
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*/
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static void update_linkspeed(struct net_device *dev)
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{
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struct at91_private *lp = (struct at91_private *) dev->priv;
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unsigned int bmsr, bmcr, lpa, mac_cfg;
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unsigned int speed, duplex;
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if (!mii_link_ok(&lp->mii)) { /* no link */
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netif_carrier_off(dev);
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printk(KERN_INFO "%s: Link down.\n", dev->name);
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return;
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}
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/* Link up, or auto-negotiation still in progress */
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read_phy(lp->phy_address, MII_BMSR, &bmsr);
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read_phy(lp->phy_address, MII_BMCR, &bmcr);
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if (bmcr & BMCR_ANENABLE) { /* AutoNegotiation is enabled */
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if (!(bmsr & BMSR_ANEGCOMPLETE))
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return; /* Do nothing - another interrupt generated when negotiation complete */
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read_phy(lp->phy_address, MII_LPA, &lpa);
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if ((lpa & LPA_100FULL) || (lpa & LPA_100HALF)) speed = SPEED_100;
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else speed = SPEED_10;
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if ((lpa & LPA_100FULL) || (lpa & LPA_10FULL)) duplex = DUPLEX_FULL;
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else duplex = DUPLEX_HALF;
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} else {
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speed = (bmcr & BMCR_SPEED100) ? SPEED_100 : SPEED_10;
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duplex = (bmcr & BMCR_FULLDPLX) ? DUPLEX_FULL : DUPLEX_HALF;
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}
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/* Update the MAC */
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mac_cfg = at91_emac_read(AT91_EMAC_CFG) & ~(AT91_EMAC_SPD | AT91_EMAC_FD);
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if (speed == SPEED_100) {
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if (duplex == DUPLEX_FULL) /* 100 Full Duplex */
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mac_cfg |= AT91_EMAC_SPD | AT91_EMAC_FD;
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else /* 100 Half Duplex */
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mac_cfg |= AT91_EMAC_SPD;
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} else {
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if (duplex == DUPLEX_FULL) /* 10 Full Duplex */
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mac_cfg |= AT91_EMAC_FD;
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else {} /* 10 Half Duplex */
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}
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at91_emac_write(AT91_EMAC_CFG, mac_cfg);
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printk(KERN_INFO "%s: Link now %i-%s\n", dev->name, speed, (duplex == DUPLEX_FULL) ? "FullDuplex" : "HalfDuplex");
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netif_carrier_on(dev);
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}
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/*
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* Handle interrupts from the PHY
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*/
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static irqreturn_t at91ether_phy_interrupt(int irq, void *dev_id, struct pt_regs *regs)
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{
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struct net_device *dev = (struct net_device *) dev_id;
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struct at91_private *lp = (struct at91_private *) dev->priv;
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unsigned int phy;
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/*
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* This hander is triggered on both edges, but the PHY chips expect
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* level-triggering. We therefore have to check if the PHY actually has
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* an IRQ pending.
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*/
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enable_mdi();
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if ((lp->phy_type == MII_DM9161_ID) || (lp->phy_type == MII_DM9161A_ID)) {
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read_phy(lp->phy_address, MII_DSINTR_REG, &phy); /* ack interrupt in Davicom PHY */
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if (!(phy & (1 << 0)))
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goto done;
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}
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else if (lp->phy_type == MII_LXT971A_ID) {
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read_phy(lp->phy_address, MII_ISINTS_REG, &phy); /* ack interrupt in Intel PHY */
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if (!(phy & (1 << 2)))
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goto done;
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}
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else if (lp->phy_type == MII_BCM5221_ID) {
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read_phy(lp->phy_address, MII_BCMINTR_REG, &phy); /* ack interrupt in Broadcom PHY */
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if (!(phy & (1 << 0)))
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goto done;
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}
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else if (lp->phy_type == MII_KS8721_ID) {
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read_phy(lp->phy_address, MII_TPISTATUS, &phy); /* ack interrupt in Micrel PHY */
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if (!(phy & ((1 << 2) | 1)))
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goto done;
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}
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update_linkspeed(dev);
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done:
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disable_mdi();
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return IRQ_HANDLED;
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}
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/*
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* Initialize and enable the PHY interrupt for link-state changes
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*/
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static void enable_phyirq(struct net_device *dev)
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{
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struct at91_private *lp = (struct at91_private *) dev->priv;
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unsigned int dsintr, irq_number;
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int status;
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if (lp->phy_type == MII_RTL8201_ID) /* RTL8201 does not have an interrupt */
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return;
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if (lp->phy_type == MII_DP83847_ID) /* DP83847 does not have an interrupt */
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return;
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if (lp->phy_type == MII_AC101L_ID) /* AC101L interrupt not supported yet */
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return;
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irq_number = lp->board_data.phy_irq_pin;
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status = request_irq(irq_number, at91ether_phy_interrupt, 0, dev->name, dev);
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if (status) {
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printk(KERN_ERR "at91_ether: PHY IRQ %d request failed - status %d!\n", irq_number, status);
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return;
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}
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spin_lock_irq(&lp->lock);
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enable_mdi();
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if ((lp->phy_type == MII_DM9161_ID) || (lp->phy_type == MII_DM9161A_ID)) { /* for Davicom PHY */
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read_phy(lp->phy_address, MII_DSINTR_REG, &dsintr);
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dsintr = dsintr & ~0xf00; /* clear bits 8..11 */
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write_phy(lp->phy_address, MII_DSINTR_REG, dsintr);
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}
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else if (lp->phy_type == MII_LXT971A_ID) { /* for Intel PHY */
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read_phy(lp->phy_address, MII_ISINTE_REG, &dsintr);
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dsintr = dsintr | 0xf2; /* set bits 1, 4..7 */
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write_phy(lp->phy_address, MII_ISINTE_REG, dsintr);
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}
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else if (lp->phy_type == MII_BCM5221_ID) { /* for Broadcom PHY */
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dsintr = (1 << 15) | ( 1 << 14);
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write_phy(lp->phy_address, MII_BCMINTR_REG, dsintr);
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}
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else if (lp->phy_type == MII_KS8721_ID) { /* for Micrel PHY */
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dsintr = (1 << 10) | ( 1 << 8);
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write_phy(lp->phy_address, MII_TPISTATUS, dsintr);
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}
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disable_mdi();
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spin_unlock_irq(&lp->lock);
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}
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/*
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* Disable the PHY interrupt
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*/
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static void disable_phyirq(struct net_device *dev)
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{
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struct at91_private *lp = (struct at91_private *) dev->priv;
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unsigned int dsintr;
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unsigned int irq_number;
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if (lp->phy_type == MII_RTL8201_ID) /* RTL8201 does not have an interrupt */
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return;
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if (lp->phy_type == MII_DP83847_ID) /* DP83847 does not have an interrupt */
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return;
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if (lp->phy_type == MII_AC101L_ID) /* AC101L interrupt not supported yet */
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return;
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spin_lock_irq(&lp->lock);
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enable_mdi();
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if ((lp->phy_type == MII_DM9161_ID) || (lp->phy_type == MII_DM9161A_ID)) { /* for Davicom PHY */
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read_phy(lp->phy_address, MII_DSINTR_REG, &dsintr);
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dsintr = dsintr | 0xf00; /* set bits 8..11 */
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write_phy(lp->phy_address, MII_DSINTR_REG, dsintr);
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}
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else if (lp->phy_type == MII_LXT971A_ID) { /* for Intel PHY */
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read_phy(lp->phy_address, MII_ISINTE_REG, &dsintr);
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dsintr = dsintr & ~0xf2; /* clear bits 1, 4..7 */
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write_phy(lp->phy_address, MII_ISINTE_REG, dsintr);
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}
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else if (lp->phy_type == MII_BCM5221_ID) { /* for Broadcom PHY */
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read_phy(lp->phy_address, MII_BCMINTR_REG, &dsintr);
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dsintr = ~(1 << 14);
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write_phy(lp->phy_address, MII_BCMINTR_REG, dsintr);
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}
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else if (lp->phy_type == MII_KS8721_ID) { /* for Micrel PHY */
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read_phy(lp->phy_address, MII_TPISTATUS, &dsintr);
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dsintr = ~((1 << 10) | (1 << 8));
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write_phy(lp->phy_address, MII_TPISTATUS, dsintr);
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}
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disable_mdi();
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spin_unlock_irq(&lp->lock);
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irq_number = lp->board_data.phy_irq_pin;
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free_irq(irq_number, dev); /* Free interrupt handler */
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}
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/*
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* Perform a software reset of the PHY.
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*/
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#if 0
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static void reset_phy(struct net_device *dev)
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{
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struct at91_private *lp = (struct at91_private *) dev->priv;
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unsigned int bmcr;
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spin_lock_irq(&lp->lock);
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enable_mdi();
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/* Perform PHY reset */
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write_phy(lp->phy_address, MII_BMCR, BMCR_RESET);
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/* Wait until PHY reset is complete */
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do {
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read_phy(lp->phy_address, MII_BMCR, &bmcr);
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} while (!(bmcr && BMCR_RESET));
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disable_mdi();
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spin_unlock_irq(&lp->lock);
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}
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#endif
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/* ......................... ADDRESS MANAGEMENT ........................ */
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/*
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* NOTE: Your bootloader must always set the MAC address correctly before
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* booting into Linux.
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*
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* - It must always set the MAC address after reset, even if it doesn't
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* happen to access the Ethernet while it's booting. Some versions of
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* U-Boot on the AT91RM9200-DK do not do this.
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*
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* - Likewise it must store the addresses in the correct byte order.
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* MicroMonitor (uMon) on the CSB337 does this incorrectly (and
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* continues to do so, for bug-compatibility).
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*/
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static short __init unpack_mac_address(struct net_device *dev, unsigned int hi, unsigned int lo)
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{
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char addr[6];
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if (machine_is_csb337()) {
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addr[5] = (lo & 0xff); /* The CSB337 bootloader stores the MAC the wrong-way around */
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addr[4] = (lo & 0xff00) >> 8;
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addr[3] = (lo & 0xff0000) >> 16;
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addr[2] = (lo & 0xff000000) >> 24;
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addr[1] = (hi & 0xff);
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addr[0] = (hi & 0xff00) >> 8;
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}
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else {
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addr[0] = (lo & 0xff);
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addr[1] = (lo & 0xff00) >> 8;
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addr[2] = (lo & 0xff0000) >> 16;
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addr[3] = (lo & 0xff000000) >> 24;
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addr[4] = (hi & 0xff);
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addr[5] = (hi & 0xff00) >> 8;
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}
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if (is_valid_ether_addr(addr)) {
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memcpy(dev->dev_addr, &addr, 6);
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return 1;
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}
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return 0;
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}
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/*
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* Set the ethernet MAC address in dev->dev_addr
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*/
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static void __init get_mac_address(struct net_device *dev)
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{
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/* Check Specific-Address 1 */
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if (unpack_mac_address(dev, at91_emac_read(AT91_EMAC_SA1H), at91_emac_read(AT91_EMAC_SA1L)))
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return;
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/* Check Specific-Address 2 */
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if (unpack_mac_address(dev, at91_emac_read(AT91_EMAC_SA2H), at91_emac_read(AT91_EMAC_SA2L)))
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return;
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/* Check Specific-Address 3 */
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if (unpack_mac_address(dev, at91_emac_read(AT91_EMAC_SA3H), at91_emac_read(AT91_EMAC_SA3L)))
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return;
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/* Check Specific-Address 4 */
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if (unpack_mac_address(dev, at91_emac_read(AT91_EMAC_SA4H), at91_emac_read(AT91_EMAC_SA4L)))
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return;
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printk(KERN_ERR "at91_ether: Your bootloader did not configure a MAC address.\n");
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}
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/*
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* Program the hardware MAC address from dev->dev_addr.
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*/
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static void update_mac_address(struct net_device *dev)
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{
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at91_emac_write(AT91_EMAC_SA1L, (dev->dev_addr[3] << 24) | (dev->dev_addr[2] << 16) | (dev->dev_addr[1] << 8) | (dev->dev_addr[0]));
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at91_emac_write(AT91_EMAC_SA1H, (dev->dev_addr[5] << 8) | (dev->dev_addr[4]));
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at91_emac_write(AT91_EMAC_SA2L, 0);
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at91_emac_write(AT91_EMAC_SA2H, 0);
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}
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/*
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* Store the new hardware address in dev->dev_addr, and update the MAC.
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*/
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static int set_mac_address(struct net_device *dev, void* addr)
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{
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struct sockaddr *address = addr;
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if (!is_valid_ether_addr(address->sa_data))
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return -EADDRNOTAVAIL;
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memcpy(dev->dev_addr, address->sa_data, dev->addr_len);
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update_mac_address(dev);
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printk("%s: Setting MAC address to %02x:%02x:%02x:%02x:%02x:%02x\n", dev->name,
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dev->dev_addr[0], dev->dev_addr[1], dev->dev_addr[2],
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dev->dev_addr[3], dev->dev_addr[4], dev->dev_addr[5]);
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|
|
return 0;
|
|
}
|
|
|
|
static int inline hash_bit_value(int bitnr, __u8 *addr)
|
|
{
|
|
if (addr[bitnr / 8] & (1 << (bitnr % 8)))
|
|
return 1;
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* The hash address register is 64 bits long and takes up two locations in the memory map.
|
|
* The least significant bits are stored in EMAC_HSL and the most significant
|
|
* bits in EMAC_HSH.
|
|
*
|
|
* The unicast hash enable and the multicast hash enable bits in the network configuration
|
|
* register enable the reception of hash matched frames. The destination address is
|
|
* reduced to a 6 bit index into the 64 bit hash register using the following hash function.
|
|
* The hash function is an exclusive or of every sixth bit of the destination address.
|
|
* hash_index[5] = da[5] ^ da[11] ^ da[17] ^ da[23] ^ da[29] ^ da[35] ^ da[41] ^ da[47]
|
|
* hash_index[4] = da[4] ^ da[10] ^ da[16] ^ da[22] ^ da[28] ^ da[34] ^ da[40] ^ da[46]
|
|
* hash_index[3] = da[3] ^ da[09] ^ da[15] ^ da[21] ^ da[27] ^ da[33] ^ da[39] ^ da[45]
|
|
* hash_index[2] = da[2] ^ da[08] ^ da[14] ^ da[20] ^ da[26] ^ da[32] ^ da[38] ^ da[44]
|
|
* hash_index[1] = da[1] ^ da[07] ^ da[13] ^ da[19] ^ da[25] ^ da[31] ^ da[37] ^ da[43]
|
|
* hash_index[0] = da[0] ^ da[06] ^ da[12] ^ da[18] ^ da[24] ^ da[30] ^ da[36] ^ da[42]
|
|
* da[0] represents the least significant bit of the first byte received, that is, the multicast/
|
|
* unicast indicator, and da[47] represents the most significant bit of the last byte
|
|
* received.
|
|
* If the hash index points to a bit that is set in the hash register then the frame will be
|
|
* matched according to whether the frame is multicast or unicast.
|
|
* A multicast match will be signalled if the multicast hash enable bit is set, da[0] is 1 and
|
|
* the hash index points to a bit set in the hash register.
|
|
* A unicast match will be signalled if the unicast hash enable bit is set, da[0] is 0 and the
|
|
* hash index points to a bit set in the hash register.
|
|
* To receive all multicast frames, the hash register should be set with all ones and the
|
|
* multicast hash enable bit should be set in the network configuration register.
|
|
*/
|
|
|
|
/*
|
|
* Return the hash index value for the specified address.
|
|
*/
|
|
static int hash_get_index(__u8 *addr)
|
|
{
|
|
int i, j, bitval;
|
|
int hash_index = 0;
|
|
|
|
for (j = 0; j < 6; j++) {
|
|
for (i = 0, bitval = 0; i < 8; i++)
|
|
bitval ^= hash_bit_value(i*6 + j, addr);
|
|
|
|
hash_index |= (bitval << j);
|
|
}
|
|
|
|
return hash_index;
|
|
}
|
|
|
|
/*
|
|
* Add multicast addresses to the internal multicast-hash table.
|
|
*/
|
|
static void at91ether_sethashtable(struct net_device *dev)
|
|
{
|
|
struct dev_mc_list *curr;
|
|
unsigned long mc_filter[2];
|
|
unsigned int i, bitnr;
|
|
|
|
mc_filter[0] = mc_filter[1] = 0;
|
|
|
|
curr = dev->mc_list;
|
|
for (i = 0; i < dev->mc_count; i++, curr = curr->next) {
|
|
if (!curr) break; /* unexpected end of list */
|
|
|
|
bitnr = hash_get_index(curr->dmi_addr);
|
|
mc_filter[bitnr >> 5] |= 1 << (bitnr & 31);
|
|
}
|
|
|
|
at91_emac_write(AT91_EMAC_HSH, mc_filter[0]);
|
|
at91_emac_write(AT91_EMAC_HSL, mc_filter[1]);
|
|
}
|
|
|
|
/*
|
|
* Enable/Disable promiscuous and multicast modes.
|
|
*/
|
|
static void at91ether_set_rx_mode(struct net_device *dev)
|
|
{
|
|
unsigned long cfg;
|
|
|
|
cfg = at91_emac_read(AT91_EMAC_CFG);
|
|
|
|
if (dev->flags & IFF_PROMISC) /* Enable promiscuous mode */
|
|
cfg |= AT91_EMAC_CAF;
|
|
else if (dev->flags & (~IFF_PROMISC)) /* Disable promiscuous mode */
|
|
cfg &= ~AT91_EMAC_CAF;
|
|
|
|
if (dev->flags & IFF_ALLMULTI) { /* Enable all multicast mode */
|
|
at91_emac_write(AT91_EMAC_HSH, -1);
|
|
at91_emac_write(AT91_EMAC_HSL, -1);
|
|
cfg |= AT91_EMAC_MTI;
|
|
} else if (dev->mc_count > 0) { /* Enable specific multicasts */
|
|
at91ether_sethashtable(dev);
|
|
cfg |= AT91_EMAC_MTI;
|
|
} else if (dev->flags & (~IFF_ALLMULTI)) { /* Disable all multicast mode */
|
|
at91_emac_write(AT91_EMAC_HSH, 0);
|
|
at91_emac_write(AT91_EMAC_HSL, 0);
|
|
cfg &= ~AT91_EMAC_MTI;
|
|
}
|
|
|
|
at91_emac_write(AT91_EMAC_CFG, cfg);
|
|
}
|
|
|
|
|
|
/* ......................... ETHTOOL SUPPORT ........................... */
|
|
|
|
|
|
static int mdio_read(struct net_device *dev, int phy_id, int location)
|
|
{
|
|
unsigned int value;
|
|
|
|
read_phy(phy_id, location, &value);
|
|
return value;
|
|
}
|
|
|
|
static void mdio_write(struct net_device *dev, int phy_id, int location, int value)
|
|
{
|
|
write_phy(phy_id, location, value);
|
|
}
|
|
|
|
static int at91ether_get_settings(struct net_device *dev, struct ethtool_cmd *cmd)
|
|
{
|
|
struct at91_private *lp = (struct at91_private *) dev->priv;
|
|
int ret;
|
|
|
|
spin_lock_irq(&lp->lock);
|
|
enable_mdi();
|
|
|
|
ret = mii_ethtool_gset(&lp->mii, cmd);
|
|
|
|
disable_mdi();
|
|
spin_unlock_irq(&lp->lock);
|
|
|
|
if (lp->phy_media == PORT_FIBRE) { /* override media type since mii.c doesn't know */
|
|
cmd->supported = SUPPORTED_FIBRE;
|
|
cmd->port = PORT_FIBRE;
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
static int at91ether_set_settings(struct net_device *dev, struct ethtool_cmd *cmd)
|
|
{
|
|
struct at91_private *lp = (struct at91_private *) dev->priv;
|
|
int ret;
|
|
|
|
spin_lock_irq(&lp->lock);
|
|
enable_mdi();
|
|
|
|
ret = mii_ethtool_sset(&lp->mii, cmd);
|
|
|
|
disable_mdi();
|
|
spin_unlock_irq(&lp->lock);
|
|
|
|
return ret;
|
|
}
|
|
|
|
static int at91ether_nwayreset(struct net_device *dev)
|
|
{
|
|
struct at91_private *lp = (struct at91_private *) dev->priv;
|
|
int ret;
|
|
|
|
spin_lock_irq(&lp->lock);
|
|
enable_mdi();
|
|
|
|
ret = mii_nway_restart(&lp->mii);
|
|
|
|
disable_mdi();
|
|
spin_unlock_irq(&lp->lock);
|
|
|
|
return ret;
|
|
}
|
|
|
|
static void at91ether_get_drvinfo(struct net_device *dev, struct ethtool_drvinfo *info)
|
|
{
|
|
strlcpy(info->driver, DRV_NAME, sizeof(info->driver));
|
|
strlcpy(info->version, DRV_VERSION, sizeof(info->version));
|
|
strlcpy(info->bus_info, dev->class_dev.dev->bus_id, sizeof(info->bus_info));
|
|
}
|
|
|
|
static struct ethtool_ops at91ether_ethtool_ops = {
|
|
.get_settings = at91ether_get_settings,
|
|
.set_settings = at91ether_set_settings,
|
|
.get_drvinfo = at91ether_get_drvinfo,
|
|
.nway_reset = at91ether_nwayreset,
|
|
.get_link = ethtool_op_get_link,
|
|
};
|
|
|
|
|
|
/* ................................ MAC ................................ */
|
|
|
|
/*
|
|
* Initialize and start the Receiver and Transmit subsystems
|
|
*/
|
|
static void at91ether_start(struct net_device *dev)
|
|
{
|
|
struct at91_private *lp = (struct at91_private *) dev->priv;
|
|
struct recv_desc_bufs *dlist, *dlist_phys;
|
|
int i;
|
|
unsigned long ctl;
|
|
|
|
dlist = lp->dlist;
|
|
dlist_phys = lp->dlist_phys;
|
|
|
|
for (i = 0; i < MAX_RX_DESCR; i++) {
|
|
dlist->descriptors[i].addr = (unsigned int) &dlist_phys->recv_buf[i][0];
|
|
dlist->descriptors[i].size = 0;
|
|
}
|
|
|
|
/* Set the Wrap bit on the last descriptor */
|
|
dlist->descriptors[i-1].addr |= EMAC_DESC_WRAP;
|
|
|
|
/* Reset buffer index */
|
|
lp->rxBuffIndex = 0;
|
|
|
|
/* Program address of descriptor list in Rx Buffer Queue register */
|
|
at91_emac_write(AT91_EMAC_RBQP, (unsigned long) dlist_phys);
|
|
|
|
/* Enable Receive and Transmit */
|
|
ctl = at91_emac_read(AT91_EMAC_CTL);
|
|
at91_emac_write(AT91_EMAC_CTL, ctl | AT91_EMAC_RE | AT91_EMAC_TE);
|
|
}
|
|
|
|
/*
|
|
* Open the ethernet interface
|
|
*/
|
|
static int at91ether_open(struct net_device *dev)
|
|
{
|
|
struct at91_private *lp = (struct at91_private *) dev->priv;
|
|
unsigned long ctl;
|
|
|
|
if (!is_valid_ether_addr(dev->dev_addr))
|
|
return -EADDRNOTAVAIL;
|
|
|
|
clk_enable(ether_clk); /* Re-enable Peripheral clock */
|
|
|
|
/* Clear internal statistics */
|
|
ctl = at91_emac_read(AT91_EMAC_CTL);
|
|
at91_emac_write(AT91_EMAC_CTL, ctl | AT91_EMAC_CSR);
|
|
|
|
/* Update the MAC address (incase user has changed it) */
|
|
update_mac_address(dev);
|
|
|
|
/* Enable PHY interrupt */
|
|
enable_phyirq(dev);
|
|
|
|
/* Enable MAC interrupts */
|
|
at91_emac_write(AT91_EMAC_IER, AT91_EMAC_RCOM | AT91_EMAC_RBNA
|
|
| AT91_EMAC_TUND | AT91_EMAC_RTRY | AT91_EMAC_TCOM
|
|
| AT91_EMAC_ROVR | AT91_EMAC_ABT);
|
|
|
|
/* Determine current link speed */
|
|
spin_lock_irq(&lp->lock);
|
|
enable_mdi();
|
|
update_linkspeed(dev);
|
|
disable_mdi();
|
|
spin_unlock_irq(&lp->lock);
|
|
|
|
at91ether_start(dev);
|
|
netif_start_queue(dev);
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Close the interface
|
|
*/
|
|
static int at91ether_close(struct net_device *dev)
|
|
{
|
|
unsigned long ctl;
|
|
|
|
/* Disable Receiver and Transmitter */
|
|
ctl = at91_emac_read(AT91_EMAC_CTL);
|
|
at91_emac_write(AT91_EMAC_CTL, ctl & ~(AT91_EMAC_TE | AT91_EMAC_RE));
|
|
|
|
/* Disable PHY interrupt */
|
|
disable_phyirq(dev);
|
|
|
|
/* Disable MAC interrupts */
|
|
at91_emac_write(AT91_EMAC_IDR, AT91_EMAC_RCOM | AT91_EMAC_RBNA
|
|
| AT91_EMAC_TUND | AT91_EMAC_RTRY | AT91_EMAC_TCOM
|
|
| AT91_EMAC_ROVR | AT91_EMAC_ABT);
|
|
|
|
netif_stop_queue(dev);
|
|
|
|
clk_disable(ether_clk); /* Disable Peripheral clock */
|
|
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Transmit packet.
|
|
*/
|
|
static int at91ether_tx(struct sk_buff *skb, struct net_device *dev)
|
|
{
|
|
struct at91_private *lp = (struct at91_private *) dev->priv;
|
|
|
|
if (at91_emac_read(AT91_EMAC_TSR) & AT91_EMAC_TSR_BNQ) {
|
|
netif_stop_queue(dev);
|
|
|
|
/* Store packet information (to free when Tx completed) */
|
|
lp->skb = skb;
|
|
lp->skb_length = skb->len;
|
|
lp->skb_physaddr = dma_map_single(NULL, skb->data, skb->len, DMA_TO_DEVICE);
|
|
lp->stats.tx_bytes += skb->len;
|
|
|
|
/* Set address of the data in the Transmit Address register */
|
|
at91_emac_write(AT91_EMAC_TAR, lp->skb_physaddr);
|
|
/* Set length of the packet in the Transmit Control register */
|
|
at91_emac_write(AT91_EMAC_TCR, skb->len);
|
|
|
|
dev->trans_start = jiffies;
|
|
} else {
|
|
printk(KERN_ERR "at91_ether.c: at91ether_tx() called, but device is busy!\n");
|
|
return 1; /* if we return anything but zero, dev.c:1055 calls kfree_skb(skb)
|
|
on this skb, he also reports -ENETDOWN and printk's, so either
|
|
we free and return(0) or don't free and return 1 */
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Update the current statistics from the internal statistics registers.
|
|
*/
|
|
static struct net_device_stats *at91ether_stats(struct net_device *dev)
|
|
{
|
|
struct at91_private *lp = (struct at91_private *) dev->priv;
|
|
int ale, lenerr, seqe, lcol, ecol;
|
|
|
|
if (netif_running(dev)) {
|
|
lp->stats.rx_packets += at91_emac_read(AT91_EMAC_OK); /* Good frames received */
|
|
ale = at91_emac_read(AT91_EMAC_ALE);
|
|
lp->stats.rx_frame_errors += ale; /* Alignment errors */
|
|
lenerr = at91_emac_read(AT91_EMAC_ELR) + at91_emac_read(AT91_EMAC_USF);
|
|
lp->stats.rx_length_errors += lenerr; /* Excessive Length or Undersize Frame error */
|
|
seqe = at91_emac_read(AT91_EMAC_SEQE);
|
|
lp->stats.rx_crc_errors += seqe; /* CRC error */
|
|
lp->stats.rx_fifo_errors += at91_emac_read(AT91_EMAC_DRFC); /* Receive buffer not available */
|
|
lp->stats.rx_errors += (ale + lenerr + seqe
|
|
+ at91_emac_read(AT91_EMAC_CDE) + at91_emac_read(AT91_EMAC_RJB));
|
|
|
|
lp->stats.tx_packets += at91_emac_read(AT91_EMAC_FRA); /* Frames successfully transmitted */
|
|
lp->stats.tx_fifo_errors += at91_emac_read(AT91_EMAC_TUE); /* Transmit FIFO underruns */
|
|
lp->stats.tx_carrier_errors += at91_emac_read(AT91_EMAC_CSE); /* Carrier Sense errors */
|
|
lp->stats.tx_heartbeat_errors += at91_emac_read(AT91_EMAC_SQEE);/* Heartbeat error */
|
|
|
|
lcol = at91_emac_read(AT91_EMAC_LCOL);
|
|
ecol = at91_emac_read(AT91_EMAC_ECOL);
|
|
lp->stats.tx_window_errors += lcol; /* Late collisions */
|
|
lp->stats.tx_aborted_errors += ecol; /* 16 collisions */
|
|
|
|
lp->stats.collisions += (at91_emac_read(AT91_EMAC_SCOL) + at91_emac_read(AT91_EMAC_MCOL) + lcol + ecol);
|
|
}
|
|
return &lp->stats;
|
|
}
|
|
|
|
/*
|
|
* Extract received frame from buffer descriptors and sent to upper layers.
|
|
* (Called from interrupt context)
|
|
*/
|
|
static void at91ether_rx(struct net_device *dev)
|
|
{
|
|
struct at91_private *lp = (struct at91_private *) dev->priv;
|
|
struct recv_desc_bufs *dlist;
|
|
unsigned char *p_recv;
|
|
struct sk_buff *skb;
|
|
unsigned int pktlen;
|
|
|
|
dlist = lp->dlist;
|
|
while (dlist->descriptors[lp->rxBuffIndex].addr & EMAC_DESC_DONE) {
|
|
p_recv = dlist->recv_buf[lp->rxBuffIndex];
|
|
pktlen = dlist->descriptors[lp->rxBuffIndex].size & 0x7ff; /* Length of frame including FCS */
|
|
skb = alloc_skb(pktlen + 2, GFP_ATOMIC);
|
|
if (skb != NULL) {
|
|
skb_reserve(skb, 2);
|
|
memcpy(skb_put(skb, pktlen), p_recv, pktlen);
|
|
|
|
skb->dev = dev;
|
|
skb->protocol = eth_type_trans(skb, dev);
|
|
skb->len = pktlen;
|
|
dev->last_rx = jiffies;
|
|
lp->stats.rx_bytes += pktlen;
|
|
netif_rx(skb);
|
|
}
|
|
else {
|
|
lp->stats.rx_dropped += 1;
|
|
printk(KERN_NOTICE "%s: Memory squeeze, dropping packet.\n", dev->name);
|
|
}
|
|
|
|
if (dlist->descriptors[lp->rxBuffIndex].size & EMAC_MULTICAST)
|
|
lp->stats.multicast++;
|
|
|
|
dlist->descriptors[lp->rxBuffIndex].addr &= ~EMAC_DESC_DONE; /* reset ownership bit */
|
|
if (lp->rxBuffIndex == MAX_RX_DESCR-1) /* wrap after last buffer */
|
|
lp->rxBuffIndex = 0;
|
|
else
|
|
lp->rxBuffIndex++;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* MAC interrupt handler
|
|
*/
|
|
static irqreturn_t at91ether_interrupt(int irq, void *dev_id, struct pt_regs *regs)
|
|
{
|
|
struct net_device *dev = (struct net_device *) dev_id;
|
|
struct at91_private *lp = (struct at91_private *) dev->priv;
|
|
unsigned long intstatus, ctl;
|
|
|
|
/* MAC Interrupt Status register indicates what interrupts are pending.
|
|
It is automatically cleared once read. */
|
|
intstatus = at91_emac_read(AT91_EMAC_ISR);
|
|
|
|
if (intstatus & AT91_EMAC_RCOM) /* Receive complete */
|
|
at91ether_rx(dev);
|
|
|
|
if (intstatus & AT91_EMAC_TCOM) { /* Transmit complete */
|
|
/* The TCOM bit is set even if the transmission failed. */
|
|
if (intstatus & (AT91_EMAC_TUND | AT91_EMAC_RTRY))
|
|
lp->stats.tx_errors += 1;
|
|
|
|
if (lp->skb) {
|
|
dev_kfree_skb_irq(lp->skb);
|
|
lp->skb = NULL;
|
|
dma_unmap_single(NULL, lp->skb_physaddr, lp->skb_length, DMA_TO_DEVICE);
|
|
}
|
|
netif_wake_queue(dev);
|
|
}
|
|
|
|
/* Work-around for Errata #11 */
|
|
if (intstatus & AT91_EMAC_RBNA) {
|
|
ctl = at91_emac_read(AT91_EMAC_CTL);
|
|
at91_emac_write(AT91_EMAC_CTL, ctl & ~AT91_EMAC_RE);
|
|
at91_emac_write(AT91_EMAC_CTL, ctl | AT91_EMAC_RE);
|
|
}
|
|
|
|
if (intstatus & AT91_EMAC_ROVR)
|
|
printk("%s: ROVR error\n", dev->name);
|
|
|
|
return IRQ_HANDLED;
|
|
}
|
|
|
|
/*
|
|
* Initialize the ethernet interface
|
|
*/
|
|
static int __init at91ether_setup(unsigned long phy_type, unsigned short phy_address, struct platform_device *pdev)
|
|
{
|
|
struct at91_eth_data *board_data = pdev->dev.platform_data;
|
|
struct net_device *dev;
|
|
struct at91_private *lp;
|
|
unsigned int val;
|
|
int res;
|
|
|
|
if (at91_dev) /* already initialized */
|
|
return 0;
|
|
|
|
dev = alloc_etherdev(sizeof(struct at91_private));
|
|
if (!dev)
|
|
return -ENOMEM;
|
|
|
|
dev->base_addr = AT91_VA_BASE_EMAC;
|
|
dev->irq = AT91_ID_EMAC;
|
|
SET_MODULE_OWNER(dev);
|
|
|
|
/* Install the interrupt handler */
|
|
if (request_irq(dev->irq, at91ether_interrupt, 0, dev->name, dev)) {
|
|
free_netdev(dev);
|
|
return -EBUSY;
|
|
}
|
|
|
|
/* Allocate memory for DMA Receive descriptors */
|
|
lp = (struct at91_private *)dev->priv;
|
|
lp->dlist = (struct recv_desc_bufs *) dma_alloc_coherent(NULL, sizeof(struct recv_desc_bufs), (dma_addr_t *) &lp->dlist_phys, GFP_KERNEL);
|
|
if (lp->dlist == NULL) {
|
|
free_irq(dev->irq, dev);
|
|
free_netdev(dev);
|
|
return -ENOMEM;
|
|
}
|
|
lp->board_data = *board_data;
|
|
platform_set_drvdata(pdev, dev);
|
|
|
|
spin_lock_init(&lp->lock);
|
|
|
|
ether_setup(dev);
|
|
dev->open = at91ether_open;
|
|
dev->stop = at91ether_close;
|
|
dev->hard_start_xmit = at91ether_tx;
|
|
dev->get_stats = at91ether_stats;
|
|
dev->set_multicast_list = at91ether_set_rx_mode;
|
|
dev->set_mac_address = set_mac_address;
|
|
dev->ethtool_ops = &at91ether_ethtool_ops;
|
|
|
|
SET_NETDEV_DEV(dev, &pdev->dev);
|
|
|
|
get_mac_address(dev); /* Get ethernet address and store it in dev->dev_addr */
|
|
update_mac_address(dev); /* Program ethernet address into MAC */
|
|
|
|
at91_emac_write(AT91_EMAC_CTL, 0);
|
|
|
|
if (lp->board_data.is_rmii)
|
|
at91_emac_write(AT91_EMAC_CFG, AT91_EMAC_CLK_DIV32 | AT91_EMAC_BIG | AT91_EMAC_RMII);
|
|
else
|
|
at91_emac_write(AT91_EMAC_CFG, AT91_EMAC_CLK_DIV32 | AT91_EMAC_BIG);
|
|
|
|
/* Perform PHY-specific initialization */
|
|
spin_lock_irq(&lp->lock);
|
|
enable_mdi();
|
|
if ((phy_type == MII_DM9161_ID) || (lp->phy_type == MII_DM9161A_ID)) {
|
|
read_phy(phy_address, MII_DSCR_REG, &val);
|
|
if ((val & (1 << 10)) == 0) /* DSCR bit 10 is 0 -- fiber mode */
|
|
lp->phy_media = PORT_FIBRE;
|
|
} else if (machine_is_csb337()) {
|
|
/* mix link activity status into LED2 link state */
|
|
write_phy(phy_address, MII_LEDCTRL_REG, 0x0d22);
|
|
}
|
|
disable_mdi();
|
|
spin_unlock_irq(&lp->lock);
|
|
|
|
lp->mii.dev = dev; /* Support for ethtool */
|
|
lp->mii.mdio_read = mdio_read;
|
|
lp->mii.mdio_write = mdio_write;
|
|
|
|
lp->phy_type = phy_type; /* Type of PHY connected */
|
|
lp->phy_address = phy_address; /* MDI address of PHY */
|
|
|
|
/* Register the network interface */
|
|
res = register_netdev(dev);
|
|
if (res) {
|
|
free_irq(dev->irq, dev);
|
|
free_netdev(dev);
|
|
dma_free_coherent(NULL, sizeof(struct recv_desc_bufs), lp->dlist, (dma_addr_t)lp->dlist_phys);
|
|
return res;
|
|
}
|
|
at91_dev = dev;
|
|
|
|
/* Determine current link speed */
|
|
spin_lock_irq(&lp->lock);
|
|
enable_mdi();
|
|
update_linkspeed(dev);
|
|
disable_mdi();
|
|
spin_unlock_irq(&lp->lock);
|
|
netif_carrier_off(dev); /* will be enabled in open() */
|
|
|
|
/* Display ethernet banner */
|
|
printk(KERN_INFO "%s: AT91 ethernet at 0x%08x int=%d %s%s (%02x:%02x:%02x:%02x:%02x:%02x)\n",
|
|
dev->name, (uint) dev->base_addr, dev->irq,
|
|
at91_emac_read(AT91_EMAC_CFG) & AT91_EMAC_SPD ? "100-" : "10-",
|
|
at91_emac_read(AT91_EMAC_CFG) & AT91_EMAC_FD ? "FullDuplex" : "HalfDuplex",
|
|
dev->dev_addr[0], dev->dev_addr[1], dev->dev_addr[2],
|
|
dev->dev_addr[3], dev->dev_addr[4], dev->dev_addr[5]);
|
|
if ((phy_type == MII_DM9161_ID) || (lp->phy_type == MII_DM9161A_ID))
|
|
printk(KERN_INFO "%s: Davicom 9196 PHY %s\n", dev->name, (lp->phy_media == PORT_FIBRE) ? "(Fiber)" : "(Copper)");
|
|
else if (phy_type == MII_LXT971A_ID)
|
|
printk(KERN_INFO "%s: Intel LXT971A PHY\n", dev->name);
|
|
else if (phy_type == MII_RTL8201_ID)
|
|
printk(KERN_INFO "%s: Realtek RTL8201(B)L PHY\n", dev->name);
|
|
else if (phy_type == MII_BCM5221_ID)
|
|
printk(KERN_INFO "%s: Broadcom BCM5221 PHY\n", dev->name);
|
|
else if (phy_type == MII_DP83847_ID)
|
|
printk(KERN_INFO "%s: National Semiconductor DP83847 PHY\n", dev->name);
|
|
else if (phy_type == MII_AC101L_ID)
|
|
printk(KERN_INFO "%s: Altima AC101L PHY\n", dev->name);
|
|
else if (phy_type == MII_KS8721_ID)
|
|
printk(KERN_INFO "%s: Micrel KS8721 PHY\n", dev->name);
|
|
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Detect MAC and PHY and perform initialization
|
|
*/
|
|
static int __init at91ether_probe(struct platform_device *pdev)
|
|
{
|
|
unsigned int phyid1, phyid2;
|
|
int detected = -1;
|
|
unsigned long phy_id;
|
|
unsigned short phy_address = 0;
|
|
|
|
ether_clk = clk_get(&pdev->dev, "ether_clk");
|
|
if (!ether_clk) {
|
|
printk(KERN_ERR "at91_ether: no clock defined\n");
|
|
return -ENODEV;
|
|
}
|
|
clk_enable(ether_clk); /* Enable Peripheral clock */
|
|
|
|
while ((detected != 0) && (phy_address < 32)) {
|
|
/* Read the PHY ID registers */
|
|
enable_mdi();
|
|
read_phy(phy_address, MII_PHYSID1, &phyid1);
|
|
read_phy(phy_address, MII_PHYSID2, &phyid2);
|
|
disable_mdi();
|
|
|
|
phy_id = (phyid1 << 16) | (phyid2 & 0xfff0);
|
|
switch (phy_id) {
|
|
case MII_DM9161_ID: /* Davicom 9161: PHY_ID1 = 0x181, PHY_ID2 = B881 */
|
|
case MII_DM9161A_ID: /* Davicom 9161A: PHY_ID1 = 0x181, PHY_ID2 = B8A0 */
|
|
case MII_LXT971A_ID: /* Intel LXT971A: PHY_ID1 = 0x13, PHY_ID2 = 78E0 */
|
|
case MII_RTL8201_ID: /* Realtek RTL8201: PHY_ID1 = 0, PHY_ID2 = 0x8201 */
|
|
case MII_BCM5221_ID: /* Broadcom BCM5221: PHY_ID1 = 0x40, PHY_ID2 = 0x61e0 */
|
|
case MII_DP83847_ID: /* National Semiconductor DP83847: */
|
|
case MII_AC101L_ID: /* Altima AC101L: PHY_ID1 = 0x22, PHY_ID2 = 0x5520 */
|
|
case MII_KS8721_ID: /* Micrel KS8721: PHY_ID1 = 0x22, PHY_ID2 = 0x1610 */
|
|
detected = at91ether_setup(phy_id, phy_address, pdev);
|
|
break;
|
|
}
|
|
|
|
phy_address++;
|
|
}
|
|
|
|
clk_disable(ether_clk); /* Disable Peripheral clock */
|
|
|
|
return detected;
|
|
}
|
|
|
|
static int __devexit at91ether_remove(struct platform_device *pdev)
|
|
{
|
|
struct at91_private *lp = (struct at91_private *) at91_dev->priv;
|
|
|
|
unregister_netdev(at91_dev);
|
|
free_irq(at91_dev->irq, at91_dev);
|
|
dma_free_coherent(NULL, sizeof(struct recv_desc_bufs), lp->dlist, (dma_addr_t)lp->dlist_phys);
|
|
clk_put(ether_clk);
|
|
|
|
free_netdev(at91_dev);
|
|
at91_dev = NULL;
|
|
return 0;
|
|
}
|
|
|
|
static struct platform_driver at91ether_driver = {
|
|
.probe = at91ether_probe,
|
|
.remove = __devexit_p(at91ether_remove),
|
|
/* FIXME: support suspend and resume */
|
|
.driver = {
|
|
.name = DRV_NAME,
|
|
.owner = THIS_MODULE,
|
|
},
|
|
};
|
|
|
|
static int __init at91ether_init(void)
|
|
{
|
|
return platform_driver_register(&at91ether_driver);
|
|
}
|
|
|
|
static void __exit at91ether_exit(void)
|
|
{
|
|
platform_driver_unregister(&at91ether_driver);
|
|
}
|
|
|
|
module_init(at91ether_init)
|
|
module_exit(at91ether_exit)
|
|
|
|
MODULE_LICENSE("GPL");
|
|
MODULE_DESCRIPTION("AT91RM9200 EMAC Ethernet driver");
|
|
MODULE_AUTHOR("Andrew Victor");
|