atlx.c

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/* atlx.c -- common functions for Attansic network drivers
 *
 * Copyright(c) 2005 - 2006 Attansic Corporation. All rights reserved.
 * Copyright(c) 2006 - 2007 Chris Snook <[email protected]>
 * Copyright(c) 2006 - 2008 Jay Cliburn <[email protected]>
 * Copyright(c) 2007 Atheros Corporation. All rights reserved.
 *
 * Derived from Intel e1000 driver
 * Copyright(c) 1999 - 2005 Intel Corporation. All rights reserved.
 *
 * 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.
 */

/* Including this file like a header is a temporary hack, I promise. -- CHS */
#ifndef ATLX_C
#define ATLX_C

#include <linux/device.h>
#include <linux/errno.h>
#include <linux/etherdevice.h>
#include <linux/if.h>
#include <linux/netdevice.h>
#include <linux/socket.h>
#include <linux/sockios.h>
#include <linux/spinlock.h>
#include <linux/string.h>
#include <linux/types.h>
#include <linux/workqueue.h>

#include "atlx.h"

static s32 atlx_read_phy_reg(struct atl1_hw *hw, u16 reg_addr, u16 *phy_data);
static u32 atlx_hash_mc_addr(struct atl1_hw *hw, u8 *mc_addr);
static void atlx_set_mac_addr(struct atl1_hw *hw);

static struct atlx_spi_flash_dev flash_table[] = {
/*  MFR_NAME  WRSR  READ  PRGM  WREN  WRDI  RDSR  RDID  SEC_ERS CHIP_ERS */
    {"Atmel", 0x00, 0x03, 0x02, 0x06, 0x04, 0x05, 0x15, 0x52,   0x62},
    {"SST",   0x01, 0x03, 0x02, 0x06, 0x04, 0x05, 0x90, 0x20,   0x60},
    {"ST",    0x01, 0x03, 0x02, 0x06, 0x04, 0x05, 0xAB, 0xD8,   0xC7},
};

static int atlx_ioctl(struct net_device *netdev, struct ifreq *ifr, int cmd)
{
    switch (cmd) {
    case SIOCGMIIPHY:
    case SIOCGMIIREG:
    case SIOCSMIIREG:
        return atlx_mii_ioctl(netdev, ifr, cmd);
    default:
        return -EOPNOTSUPP;
    }
}

static int atlx_set_mac(struct net_device *netdev, void *p)
{
    struct atlx_adapter *adapter = netdev_priv(netdev);
    struct sockaddr *addr = p;

    if (netif_running(netdev))
        return -EBUSY;

    if (!is_valid_ether_addr(addr->sa_data))
        return -EADDRNOTAVAIL;

    memcpy(netdev->dev_addr, addr->sa_data, netdev->addr_len);
    memcpy(adapter->hw.mac_addr, addr->sa_data, netdev->addr_len);
    netdev->addr_assign_type &= ~NET_ADDR_RANDOM;

    atlx_set_mac_addr(&adapter->hw);
    return 0;
}

static void atlx_check_for_link(struct atlx_adapter *adapter)
{
    struct net_device *netdev = adapter->netdev;
    u16 phy_data = 0;

    spin_lock(&adapter->lock);
    adapter->phy_timer_pending = false;
    atlx_read_phy_reg(&adapter->hw, MII_BMSR, &phy_data);
    atlx_read_phy_reg(&adapter->hw, MII_BMSR, &phy_data);
    spin_unlock(&adapter->lock);

    /* notify upper layer link down ASAP */
    if (!(phy_data & BMSR_LSTATUS)) {
        /* Link Down */
        if (netif_carrier_ok(netdev)) {
            /* old link state: Up */
            dev_info(&adapter->pdev->dev, "%s link is down\n",
                netdev->name);
            adapter->link_speed = SPEED_0;
            netif_carrier_off(netdev);
        }
    }
    schedule_work(&adapter->link_chg_task);
}

static void atlx_set_multi(struct net_device *netdev)
{
    struct atlx_adapter *adapter = netdev_priv(netdev);
    struct atlx_hw *hw = &adapter->hw;
    struct netdev_hw_addr *ha;
    u32 rctl;
    u32 hash_value;

    /* Check for Promiscuous and All Multicast modes */
    rctl = ioread32(hw->hw_addr + REG_MAC_CTRL);
    if (netdev->flags & IFF_PROMISC)
        rctl |= MAC_CTRL_PROMIS_EN;
    else if (netdev->flags & IFF_ALLMULTI) {
        rctl |= MAC_CTRL_MC_ALL_EN;
        rctl &= ~MAC_CTRL_PROMIS_EN;
    } else
        rctl &= ~(MAC_CTRL_PROMIS_EN | MAC_CTRL_MC_ALL_EN);

    iowrite32(rctl, hw->hw_addr + REG_MAC_CTRL);

    /* clear the old settings from the multicast hash table */
    iowrite32(0, hw->hw_addr + REG_RX_HASH_TABLE);
    iowrite32(0, (hw->hw_addr + REG_RX_HASH_TABLE) + (1 << 2));

    /* compute mc addresses' hash value ,and put it into hash table */
    netdev_for_each_mc_addr(ha, netdev) {
        hash_value = atlx_hash_mc_addr(hw, ha->addr);
        atlx_hash_set(hw, hash_value);
    }
}

static inline void atlx_imr_set(struct atlx_adapter *adapter,
                unsigned int imr)
{
    iowrite32(imr, adapter->hw.hw_addr + REG_IMR);
    ioread32(adapter->hw.hw_addr + REG_IMR);
}

static void atlx_irq_enable(struct atlx_adapter *adapter)
{
    atlx_imr_set(adapter, IMR_NORMAL_MASK);
    adapter->int_enabled = true;
}

static void atlx_irq_disable(struct atlx_adapter *adapter)
{
    adapter->int_enabled = false;
    atlx_imr_set(adapter, 0);
    synchronize_irq(adapter->pdev->irq);
}

static void atlx_clear_phy_int(struct atlx_adapter *adapter)
{
    u16 phy_data;
    unsigned long flags;

    spin_lock_irqsave(&adapter->lock, flags);
    atlx_read_phy_reg(&adapter->hw, 19, &phy_data);
    spin_unlock_irqrestore(&adapter->lock, flags);
}

static void atlx_tx_timeout(struct net_device *netdev)
{
    struct atlx_adapter *adapter = netdev_priv(netdev);
    /* Do the reset outside of interrupt context */
    schedule_work(&adapter->reset_dev_task);
}

/*
 * atlx_link_chg_task - deal with link change event Out of interrupt context
 */
static void atlx_link_chg_task(struct work_struct *work)
{
    struct atlx_adapter *adapter;
    unsigned long flags;

    adapter = container_of(work, struct atlx_adapter, link_chg_task);

    spin_lock_irqsave(&adapter->lock, flags);
    atlx_check_link(adapter);
    spin_unlock_irqrestore(&adapter->lock, flags);
}

static void __atlx_vlan_mode(netdev_features_t features, u32 *ctrl)
{
    if (features & NETIF_F_HW_VLAN_RX) {
        /* enable VLAN tag insert/strip */
        *ctrl |= MAC_CTRL_RMV_VLAN;
    } else {
        /* disable VLAN tag insert/strip */
        *ctrl &= ~MAC_CTRL_RMV_VLAN;
    }
}

static void atlx_vlan_mode(struct net_device *netdev,
    netdev_features_t features)
{
    struct atlx_adapter *adapter = netdev_priv(netdev);
    unsigned long flags;
    u32 ctrl;

    spin_lock_irqsave(&adapter->lock, flags);
    /* atlx_irq_disable(adapter); FIXME: confirm/remove */
    ctrl = ioread32(adapter->hw.hw_addr + REG_MAC_CTRL);
    __atlx_vlan_mode(features, &ctrl);
    iowrite32(ctrl, adapter->hw.hw_addr + REG_MAC_CTRL);
    /* atlx_irq_enable(adapter); FIXME */
    spin_unlock_irqrestore(&adapter->lock, flags);
}

static void atlx_restore_vlan(struct atlx_adapter *adapter)
{
    atlx_vlan_mode(adapter->netdev, adapter->netdev->features);
}

static netdev_features_t atlx_fix_features(struct net_device *netdev,
    netdev_features_t features)
{
    /*
     * Since there is no support for separate rx/tx vlan accel
     * enable/disable make sure tx flag is always in same state as rx.
     */
    if (features & NETIF_F_HW_VLAN_RX)
        features |= NETIF_F_HW_VLAN_TX;
    else
        features &= ~NETIF_F_HW_VLAN_TX;

    return features;
}

static int atlx_set_features(struct net_device *netdev,
    netdev_features_t features)
{
    netdev_features_t changed = netdev->features ^ features;

    if (changed & NETIF_F_HW_VLAN_RX)
        atlx_vlan_mode(netdev, features);

    return 0;
}

#endif /* ATLX_C */