tsi108_eth.c

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/*******************************************************************************

  Copyright(c) 2006 Tundra Semiconductor Corporation.

  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, write to the Free Software Foundation, Inc., 59
  Temple Place - Suite 330, Boston, MA  02111-1307, USA.

*******************************************************************************/

/* This driver is based on the driver code originally developed
 * for the Intel IOC80314 (ForestLake) Gigabit Ethernet by
 * [e-mail]  * Copyright (C) 2003 TimeSys Corporation
 *
 * Currently changes from original version are:
 * - porting to Tsi108-based platform and kernel 2.6 ([e-mail])
 * - modifications to handle two ports independently and support for
 *   additional PHY devices ([e-mail])
 * - Get hardware information from platform device. ([e-mail])
 *
 */

#include <linux/module.h>
#include <linux/types.h>
#include <linux/init.h>
#include <linux/net.h>
#include <linux/netdevice.h>
#include <linux/etherdevice.h>
#include <linux/skbuff.h>
#include <linux/slab.h>
#include <linux/spinlock.h>
#include <linux/delay.h>
#include <linux/crc32.h>
#include <linux/mii.h>
#include <linux/device.h>
#include <linux/pci.h>
#include <linux/rtnetlink.h>
#include <linux/timer.h>
#include <linux/platform_device.h>

#include <asm/system.h>
#include <asm/io.h>
#include <asm/tsi108.h>

#include "tsi108_eth.h"

#define MII_READ_DELAY 10000	/* max link wait time in msec */

#define TSI108_RXRING_LEN     256

/* NOTE: The driver currently does not support receiving packets
 * larger than the buffer size, so don't decrease this (unless you
 * want to add such support).
 */
#define TSI108_RXBUF_SIZE     1536

#define TSI108_TXRING_LEN     256

#define TSI108_TX_INT_FREQ    64

/* Check the phy status every half a second. */
#define CHECK_PHY_INTERVAL (HZ/2)

static int tsi108_init_one(struct platform_device *pdev);
static int tsi108_ether_remove(struct platform_device *pdev);

struct tsi108_prv_data {
	void  __iomem *regs;	/* Base of normal regs */
	void  __iomem *phyregs;	/* Base of register bank used for PHY access */

	struct net_device *dev;
	struct napi_struct napi;

	unsigned int phy;		/* Index of PHY for this interface */
	unsigned int irq_num;
	unsigned int id;
	unsigned int phy_type;

	struct timer_list timer;/* Timer that triggers the check phy function */
	unsigned int rxtail;	/* Next entry in rxring to read */
	unsigned int rxhead;	/* Next entry in rxring to give a new buffer */
	unsigned int rxfree;	/* Number of free, allocated RX buffers */

	unsigned int rxpending;	/* Non-zero if there are still descriptors
				 * to be processed from a previous descriptor
				 * interrupt condition that has been cleared */

	unsigned int txtail;	/* Next TX descriptor to check status on */
	unsigned int txhead;	/* Next TX descriptor to use */

	/* Number of free TX descriptors.  This could be calculated from
	 * rxhead and rxtail if one descriptor were left unused to disambiguate
	 * full and empty conditions, but it's simpler to just keep track
	 * explicitly. */

	unsigned int txfree;

	unsigned int phy_ok;		/* The PHY is currently powered on. */

	/* PHY status (duplex is 1 for half, 2 for full,
	 * so that the default 0 indicates that neither has
	 * yet been configured). */

	unsigned int link_up;
	unsigned int speed;
	unsigned int duplex;

	tx_desc *txring;
	rx_desc *rxring;
	struct sk_buff *txskbs[TSI108_TXRING_LEN];
	struct sk_buff *rxskbs[TSI108_RXRING_LEN];

	dma_addr_t txdma, rxdma;

	/* txlock nests in misclock and phy_lock */

	spinlock_t txlock, misclock;

	/* stats is used to hold the upper bits of each hardware counter,
	 * and tmpstats is used to hold the full values for returning
	 * to the caller of get_stats().  They must be separate in case
	 * an overflow interrupt occurs before the stats are consumed.
	 */

	struct net_device_stats stats;
	struct net_device_stats tmpstats;

	/* These stats are kept separate in hardware, thus require individual
	 * fields for handling carry.  They are combined in get_stats.
	 */

	unsigned long rx_fcs;	/* Add to rx_frame_errors */
	unsigned long rx_short_fcs;	/* Add to rx_frame_errors */
	unsigned long rx_long_fcs;	/* Add to rx_frame_errors */
	unsigned long rx_underruns;	/* Add to rx_length_errors */
	unsigned long rx_overruns;	/* Add to rx_length_errors */

	unsigned long tx_coll_abort;	/* Add to tx_aborted_errors/collisions */
	unsigned long tx_pause_drop;	/* Add to tx_aborted_errors */

	unsigned long mc_hash[16];
	u32 msg_enable;			/* debug message level */
	struct mii_if_info mii_if;
	unsigned int init_media;
};

/* Structure for a device driver */

static struct platform_driver tsi_eth_driver = {
	.probe = tsi108_init_one,
	.remove = tsi108_ether_remove,
	.driver	= {
		.name = "tsi-ethernet",
	},
};

static void tsi108_timed_checker(unsigned long dev_ptr);

static void dump_eth_one(struct net_device *dev)
{
	struct tsi108_prv_data *data = netdev_priv(dev);

	printk("Dumping %s...\n", dev->name);
	printk("intstat %x intmask %x phy_ok %d"
	       " link %d speed %d duplex %d\n",
	       TSI_READ(TSI108_EC_INTSTAT),
	       TSI_READ(TSI108_EC_INTMASK), data->phy_ok,
	       data->link_up, data->speed, data->duplex);

	printk("TX: head %d, tail %d, free %d, stat %x, estat %x, err %x\n",
	       data->txhead, data->txtail, data->txfree,
	       TSI_READ(TSI108_EC_TXSTAT),
	       TSI_READ(TSI108_EC_TXESTAT),
	       TSI_READ(TSI108_EC_TXERR));

	printk("RX: head %d, tail %d, free %d, stat %x,"
	       " estat %x, err %x, pending %d\n\n",
	       data->rxhead, data->rxtail, data->rxfree,
	       TSI_READ(TSI108_EC_RXSTAT),
	       TSI_READ(TSI108_EC_RXESTAT),
	       TSI_READ(TSI108_EC_RXERR), data->rxpending);
}

/* Synchronization is needed between the thread and up/down events.
 * Note that the PHY is accessed through the same registers for both
 * interfaces, so this can't be made interface-specific.
 */

static DEFINE_SPINLOCK(phy_lock);

static int tsi108_read_mii(struct tsi108_prv_data *data, int reg)
{
	unsigned i;

	TSI_WRITE_PHY(TSI108_MAC_MII_ADDR,
				(data->phy << TSI108_MAC_MII_ADDR_PHY) |
				(reg << TSI108_MAC_MII_ADDR_REG));
	TSI_WRITE_PHY(TSI108_MAC_MII_CMD, 0);
	TSI_WRITE_PHY(TSI108_MAC_MII_CMD, TSI108_MAC_MII_CMD_READ);
	for (i = 0; i < 100; i++) {
		if (!(TSI_READ_PHY(TSI108_MAC_MII_IND) &
		      (TSI108_MAC_MII_IND_NOTVALID | TSI108_MAC_MII_IND_BUSY)))
			break;
		udelay(10);
	}

	if (i == 100)
		return 0xffff;
	else
		return (TSI_READ_PHY(TSI108_MAC_MII_DATAIN));
}

static void tsi108_write_mii(struct tsi108_prv_data *data,
				int reg, u16 val)
{
	unsigned i = 100;
	TSI_WRITE_PHY(TSI108_MAC_MII_ADDR,
				(data->phy << TSI108_MAC_MII_ADDR_PHY) |
				(reg << TSI108_MAC_MII_ADDR_REG));
	TSI_WRITE_PHY(TSI108_MAC_MII_DATAOUT, val);
	while (i--) {
		if(!(TSI_READ_PHY(TSI108_MAC_MII_IND) &
			TSI108_MAC_MII_IND_BUSY))
			break;
		udelay(10);
	}
}

static int tsi108_mdio_read(struct net_device *dev, int addr, int reg)
{
	struct tsi108_prv_data *data = netdev_priv(dev);
	return tsi108_read_mii(data, reg);
}

static void tsi108_mdio_write(struct net_device *dev, int addr, int reg, int val)
{
	struct tsi108_prv_data *data = netdev_priv(dev);
	tsi108_write_mii(data, reg, val);
}

static inline void tsi108_write_tbi(struct tsi108_prv_data *data,
					int reg, u16 val)
{
	unsigned i = 1000;
	TSI_WRITE(TSI108_MAC_MII_ADDR,
			     (0x1e << TSI108_MAC_MII_ADDR_PHY)
			     | (reg << TSI108_MAC_MII_ADDR_REG));
	TSI_WRITE(TSI108_MAC_MII_DATAOUT, val);
	while(i--) {
		if(!(TSI_READ(TSI108_MAC_MII_IND) & TSI108_MAC_MII_IND_BUSY))
			return;
		udelay(10);
	}
	printk(KERN_ERR "%s function time out \n", __FUNCTION__);
}

static int mii_speed(struct mii_if_info *mii)
{
	int advert, lpa, val, media;
	int lpa2 = 0;
	int speed;

	if (!mii_link_ok(mii))
		return 0;

	val = (*mii->mdio_read) (mii->dev, mii->phy_id, MII_BMSR);
	if ((val & BMSR_ANEGCOMPLETE) == 0)
		return 0;

	advert = (*mii->mdio_read) (mii->dev, mii->phy_id, MII_ADVERTISE);
	lpa = (*mii->mdio_read) (mii->dev, mii->phy_id, MII_LPA);
	media = mii_nway_result(advert & lpa);

	if (mii->supports_gmii)
		lpa2 = mii->mdio_read(mii->dev, mii->phy_id, MII_STAT1000);

	speed = lpa2 & (LPA_1000FULL | LPA_1000HALF) ? 1000 :
			(media & (ADVERTISE_100FULL | ADVERTISE_100HALF) ? 100 : 10);
	return speed;
}

static void tsi108_check_phy(struct net_device *dev)
{
	struct tsi108_prv_data *data = netdev_priv(dev);
	u32 mac_cfg2_reg, portctrl_reg;
	u32 duplex;
	u32 speed;
	unsigned long flags;

	/* Do a dummy read, as for some reason the first read
	 * after a link becomes up returns link down, even if
	 * it's been a while since the link came up.
	 */

	spin_lock_irqsave(&phy_lock, flags);

	if (!data->phy_ok)
		goto out;

	tsi108_read_mii(data, MII_BMSR);

	duplex = mii_check_media(&data->mii_if, netif_msg_link(data), data->init_media);
	data->init_media = 0;

	if (netif_carrier_ok(dev)) {

		speed = mii_speed(&data->mii_if);

		if ((speed != data->speed) || duplex) {

			mac_cfg2_reg = TSI_READ(TSI108_MAC_CFG2);
			portctrl_reg = TSI_READ(TSI108_EC_PORTCTRL);

			mac_cfg2_reg &= ~TSI108_MAC_CFG2_IFACE_MASK;

			if (speed == 1000) {
				mac_cfg2_reg |= TSI108_MAC_CFG2_GIG;
				portctrl_reg &= ~TSI108_EC_PORTCTRL_NOGIG;
			} else {
				mac_cfg2_reg |= TSI108_MAC_CFG2_NOGIG;
				portctrl_reg |= TSI108_EC_PORTCTRL_NOGIG;
			}

			data->speed = speed;

			if (data->mii_if.full_duplex) {
				mac_cfg2_reg |= TSI108_MAC_CFG2_FULLDUPLEX;
				portctrl_reg &= ~TSI108_EC_PORTCTRL_HALFDUPLEX;
				data->duplex = 2;
			} else {
				mac_cfg2_reg &= ~TSI108_MAC_CFG2_FULLDUPLEX;
				portctrl_reg |= TSI108_EC_PORTCTRL_HALFDUPLEX;
				data->duplex = 1;
			}

			TSI_WRITE(TSI108_MAC_CFG2, mac_cfg2_reg);
			TSI_WRITE(TSI108_EC_PORTCTRL, portctrl_reg);

			if (data->link_up == 0) {
				/* The manual says it can take 3-4 usecs for the speed change
				 * to take effect.
				 */
				udelay(5);

				spin_lock(&data->txlock);
				if (is_valid_ether_addr(dev->dev_addr) && data->txfree)
					netif_wake_queue(dev);

				data->link_up = 1;
				spin_unlock(&data->txlock);
			}
		}

	} else {
		if (data->link_up == 1) {
			netif_stop_queue(dev);
			data->link_up = 0;
			printk(KERN_NOTICE "%s : link is down\n", dev->name);
		}

		goto out;
	}


out:
	spin_unlock_irqrestore(&phy_lock, flags);
}

static inline void
tsi108_stat_carry_one(int carry, int carry_bit, int carry_shift,
		      unsigned long *upper)
{
	if (carry & carry_bit)
		*upper += carry_shift;
}

static void tsi108_stat_carry(struct net_device *dev)
{
	struct tsi108_prv_data *data = netdev_priv(dev);
	u32 carry1, carry2;

	spin_lock_irq(&data->misclock);

	carry1 = TSI_READ(TSI108_STAT_CARRY1);
	carry2 = TSI_READ(TSI108_STAT_CARRY2);

	TSI_WRITE(TSI108_STAT_CARRY1, carry1);
	TSI_WRITE(TSI108_STAT_CARRY2, carry2);

	tsi108_stat_carry_one(carry1, TSI108_STAT_CARRY1_RXBYTES,
			      TSI108_STAT_RXBYTES_CARRY, &data->stats.rx_bytes);

	tsi108_stat_carry_one(carry1, TSI108_STAT_CARRY1_RXPKTS,
			      TSI108_STAT_RXPKTS_CARRY,
			      &data->stats.rx_packets);

	tsi108_stat_carry_one(carry1, TSI108_STAT_CARRY1_RXFCS,
			      TSI108_STAT_RXFCS_CARRY, &data->rx_fcs);

	tsi108_stat_carry_one(carry1, TSI108_STAT_CARRY1_RXMCAST,
			      TSI108_STAT_RXMCAST_CARRY,
			      &data->stats.multicast);

	tsi108_stat_carry_one(carry1, TSI108_STAT_CARRY1_RXALIGN,
			      TSI108_STAT_RXALIGN_CARRY,
			      &data->stats.rx_frame_errors);

	tsi108_stat_carry_one(carry1, TSI108_STAT_CARRY1_RXLENGTH,
			      TSI108_STAT_RXLENGTH_CARRY,
			      &data->stats.rx_length_errors);

	tsi108_stat_carry_one(carry1, TSI108_STAT_CARRY1_RXRUNT,
			      TSI108_STAT_RXRUNT_CARRY, &data->rx_underruns);

	tsi108_stat_carry_one(carry1, TSI108_STAT_CARRY1_RXJUMBO,
			      TSI108_STAT_RXJUMBO_CARRY, &data->rx_overruns);