skge.c

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/*
 * New driver for Marvell Yukon chipset and SysKonnect Gigabit
 * Ethernet adapters. Based on earlier sk98lin, e100 and
 * FreeBSD if_sk drivers.
 *
 * This driver intentionally does not support all the features
 * of the original driver such as link fail-over and link management because
 * those should be done at higher levels.
 *
 * Copyright (C) 2004, 2005 Stephen Hemminger <[e-mail]>
 *
 * 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.
 *
 * 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., 675 Mass Ave, Cambridge, MA 02139, USA.
 */

#include <linux/in.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/moduleparam.h>
#include <linux/netdevice.h>
#include <linux/etherdevice.h>
#include <linux/ethtool.h>
#include <linux/pci.h>
#include <linux/if_vlan.h>
#include <linux/ip.h>
#include <linux/delay.h>
#include <linux/crc32.h>
#include <linux/dma-mapping.h>
#include <linux/debugfs.h>
#include <linux/seq_file.h>
#include <linux/mii.h>
#include <asm/irq.h>

#include "skge.h"

#define DRV_NAME		"skge"
#define DRV_VERSION		"1.13"
#define PFX			DRV_NAME " "

#define DEFAULT_TX_RING_SIZE	128
#define DEFAULT_RX_RING_SIZE	512
#define MAX_TX_RING_SIZE	1024
#define TX_LOW_WATER		(MAX_SKB_FRAGS + 1)
#define MAX_RX_RING_SIZE	4096
#define RX_COPY_THRESHOLD	128
#define RX_BUF_SIZE		1536
#define PHY_RETRIES	        1000
#define ETH_JUMBO_MTU		9000
#define TX_WATCHDOG		(5 * HZ)
#define NAPI_WEIGHT		64
#define BLINK_MS		250
#define LINK_HZ			HZ

#define SKGE_EEPROM_MAGIC	0x9933aabb


MODULE_DESCRIPTION("SysKonnect Gigabit Ethernet driver");
MODULE_AUTHOR("Stephen Hemminger <[e-mail]>");
MODULE_LICENSE("GPL");
MODULE_VERSION(DRV_VERSION);

static const u32 default_msg
	= NETIF_MSG_DRV| NETIF_MSG_PROBE| NETIF_MSG_LINK
	  | NETIF_MSG_IFUP| NETIF_MSG_IFDOWN;

static int debug = -1;	/* defaults above */
module_param(debug, int, 0);
MODULE_PARM_DESC(debug, "Debug level (0=none,...,16=all)");

static const struct pci_device_id skge_id_table[] = {
	{ PCI_DEVICE(PCI_VENDOR_ID_3COM, PCI_DEVICE_ID_3COM_3C940) },
	{ PCI_DEVICE(PCI_VENDOR_ID_3COM, PCI_DEVICE_ID_3COM_3C940B) },
	{ PCI_DEVICE(PCI_VENDOR_ID_SYSKONNECT, PCI_DEVICE_ID_SYSKONNECT_GE) },
	{ PCI_DEVICE(PCI_VENDOR_ID_SYSKONNECT, PCI_DEVICE_ID_SYSKONNECT_YU) },
	{ PCI_DEVICE(PCI_VENDOR_ID_DLINK, PCI_DEVICE_ID_DLINK_DGE510T) },
	{ PCI_DEVICE(PCI_VENDOR_ID_DLINK, 0x4b01) },	/* DGE-530T */
	{ PCI_DEVICE(PCI_VENDOR_ID_MARVELL, 0x4320) },
	{ PCI_DEVICE(PCI_VENDOR_ID_MARVELL, 0x5005) }, /* Belkin */
	{ PCI_DEVICE(PCI_VENDOR_ID_CNET, PCI_DEVICE_ID_CNET_GIGACARD) },
	{ PCI_DEVICE(PCI_VENDOR_ID_LINKSYS, PCI_DEVICE_ID_LINKSYS_EG1064) },
	{ PCI_VENDOR_ID_LINKSYS, 0x1032, PCI_ANY_ID, 0x0015 },
	{ 0 }
};
MODULE_DEVICE_TABLE(pci, skge_id_table);

static int skge_up(struct net_device *dev);
static int skge_down(struct net_device *dev);
static void skge_phy_reset(struct skge_port *skge);
static void skge_tx_clean(struct net_device *dev);
static int xm_phy_write(struct skge_hw *hw, int port, u16 reg, u16 val);
static int gm_phy_write(struct skge_hw *hw, int port, u16 reg, u16 val);
static void genesis_get_stats(struct skge_port *skge, u64 *data);
static void yukon_get_stats(struct skge_port *skge, u64 *data);
static void yukon_init(struct skge_hw *hw, int port);
static void genesis_mac_init(struct skge_hw *hw, int port);
static void genesis_link_up(struct skge_port *skge);

/* Avoid conditionals by using array */
static const int txqaddr[] = { Q_XA1, Q_XA2 };
static const int rxqaddr[] = { Q_R1, Q_R2 };
static const u32 rxirqmask[] = { IS_R1_F, IS_R2_F };
static const u32 txirqmask[] = { IS_XA1_F, IS_XA2_F };
static const u32 napimask[] = { IS_R1_F|IS_XA1_F, IS_R2_F|IS_XA2_F };
static const u32 portmask[] = { IS_PORT_1, IS_PORT_2 };

static int skge_get_regs_len(struct net_device *dev)
{
	return 0x4000;
}

/*
 * Returns copy of whole control register region
 * Note: skip RAM address register because accessing it will
 * 	 cause bus hangs!
 */
static void skge_get_regs(struct net_device *dev, struct ethtool_regs *regs,
			  void *p)
{
	const struct skge_port *skge = netdev_priv(dev);
	const void __iomem *io = skge->hw->regs;

	regs->version = 1;
	memset(p, 0, regs->len);
	memcpy_fromio(p, io, B3_RAM_ADDR);

	memcpy_fromio(p + B3_RI_WTO_R1, io + B3_RI_WTO_R1,
		      regs->len - B3_RI_WTO_R1);
}

/* Wake on Lan only supported on Yukon chips with rev 1 or above */
static u32 wol_supported(const struct skge_hw *hw)
{
	if (hw->chip_id == CHIP_ID_GENESIS)
		return 0;

	if (hw->chip_id == CHIP_ID_YUKON && hw->chip_rev == 0)
		return 0;

	return WAKE_MAGIC | WAKE_PHY;
}

static u32 pci_wake_enabled(struct pci_dev *dev)
{
	int pm = pci_find_capability(dev, PCI_CAP_ID_PM);
	u16 value;

	/* If device doesn't support PM Capabilities, but request is to disable
	 * wake events, it's a nop; otherwise fail */
	if (!pm)
		return 0;

	pci_read_config_word(dev, pm + PCI_PM_PMC, &value);

	value &= PCI_PM_CAP_PME_MASK;
	value >>= ffs(PCI_PM_CAP_PME_MASK) - 1;   /* First bit of mask */

	return value != 0;
}

static void skge_wol_init(struct skge_port *skge)
{
	struct skge_hw *hw = skge->hw;
	int port = skge->port;
	u16 ctrl;

	skge_write16(hw, B0_CTST, CS_RST_CLR);
	skge_write16(hw, SK_REG(port, GMAC_LINK_CTRL), GMLC_RST_CLR);

	/* Turn on Vaux */
	skge_write8(hw, B0_POWER_CTRL,
		    PC_VAUX_ENA | PC_VCC_ENA | PC_VAUX_ON | PC_VCC_OFF);

	/* WA code for COMA mode -- clear PHY reset */
	if (hw->chip_id == CHIP_ID_YUKON_LITE &&
	    hw->chip_rev >= CHIP_REV_YU_LITE_A3) {
		u32 reg = skge_read32(hw, B2_GP_IO);
		reg |= GP_DIR_9;
		reg &= ~GP_IO_9;
		skge_write32(hw, B2_GP_IO, reg);
	}

	skge_write32(hw, SK_REG(port, GPHY_CTRL),
		     GPC_DIS_SLEEP |
		     GPC_HWCFG_M_3 | GPC_HWCFG_M_2 | GPC_HWCFG_M_1 | GPC_HWCFG_M_0 |
		     GPC_ANEG_1 | GPC_RST_SET);

	skge_write32(hw, SK_REG(port, GPHY_CTRL),
		     GPC_DIS_SLEEP |
		     GPC_HWCFG_M_3 | GPC_HWCFG_M_2 | GPC_HWCFG_M_1 | GPC_HWCFG_M_0 |
		     GPC_ANEG_1 | GPC_RST_CLR);

	skge_write32(hw, SK_REG(port, GMAC_CTRL), GMC_RST_CLR);

	/* Force to 10/100 skge_reset will re-enable on resume	 */
	gm_phy_write(hw, port, PHY_MARV_AUNE_ADV,
		     PHY_AN_100FULL | PHY_AN_100HALF |
		     PHY_AN_10FULL | PHY_AN_10HALF| PHY_AN_CSMA);
	/* no 1000 HD/FD */
	gm_phy_write(hw, port, PHY_MARV_1000T_CTRL, 0);
	gm_phy_write(hw, port, PHY_MARV_CTRL,
		     PHY_CT_RESET | PHY_CT_SPS_LSB | PHY_CT_ANE |
		     PHY_CT_RE_CFG | PHY_CT_DUP_MD);


	/* Set GMAC to no flow control and auto update for speed/duplex */
	gma_write16(hw, port, GM_GP_CTRL,
		    GM_GPCR_FC_TX_DIS|GM_GPCR_TX_ENA|GM_GPCR_RX_ENA|
		    GM_GPCR_DUP_FULL|GM_GPCR_FC_RX_DIS|GM_GPCR_AU_FCT_DIS);

	/* Set WOL address */
	memcpy_toio(hw->regs + WOL_REGS(port, WOL_MAC_ADDR),
		    skge->netdev->dev_addr, ETH_ALEN);

	/* Turn on appropriate WOL control bits */
	skge_write16(hw, WOL_REGS(port, WOL_CTRL_STAT), WOL_CTL_CLEAR_RESULT);
	ctrl = 0;
	if (skge->wol & WAKE_PHY)
		ctrl |= WOL_CTL_ENA_PME_ON_LINK_CHG|WOL_CTL_ENA_LINK_CHG_UNIT;
	else
		ctrl |= WOL_CTL_DIS_PME_ON_LINK_CHG|WOL_CTL_DIS_LINK_CHG_UNIT;

	if (skge->wol & WAKE_MAGIC)
		ctrl |= WOL_CTL_ENA_PME_ON_MAGIC_PKT|WOL_CTL_ENA_MAGIC_PKT_UNIT;
	else
		ctrl |= WOL_CTL_DIS_PME_ON_MAGIC_PKT|WOL_CTL_DIS_MAGIC_PKT_UNIT;;

	ctrl |= WOL_CTL_DIS_PME_ON_PATTERN|WOL_CTL_DIS_PATTERN_UNIT;
	skge_write16(hw, WOL_REGS(port, WOL_CTRL_STAT), ctrl);

	/* block receiver */
	skge_write8(hw, SK_REG(port, RX_GMF_CTRL_T), GMF_RST_SET);
}

static void skge_get_wol(struct net_device *dev, struct ethtool_wolinfo *wol)
{
	struct skge_port *skge = netdev_priv(dev);

	wol->supported = wol_supported(skge->hw);
	wol->wolopts = skge->wol;
}

static int skge_set_wol(struct net_device *dev, struct ethtool_wolinfo *wol)
{
	struct skge_port *skge = netdev_priv(dev);
	struct skge_hw *hw = skge->hw;

	if (wol->wolopts & ~wol_supported(hw))
		return -EOPNOTSUPP;

	skge->wol = wol->wolopts;
	return 0;
}

/* Determine supported/advertised modes based on hardware.
 * Note: ethtool ADVERTISED_xxx == SUPPORTED_xxx
 */
static u32 skge_supported_modes(const struct skge_hw *hw)
{
	u32 supported;

	if (hw->copper) {
		supported = SUPPORTED_10baseT_Half
			| SUPPORTED_10baseT_Full
			| SUPPORTED_100baseT_Half
			| SUPPORTED_100baseT_Full
			| SUPPORTED_1000baseT_Half
			| SUPPORTED_1000baseT_Full
			| SUPPORTED_Autoneg| SUPPORTED_TP;

		if (hw->chip_id == CHIP_ID_GENESIS)
			supported &= ~(SUPPORTED_10baseT_Half
					     | SUPPORTED_10baseT_Full
					     | SUPPORTED_100baseT_Half
					     | SUPPORTED_100baseT_Full);

		else if (hw->chip_id == CHIP_ID_YUKON)
			supported &= ~SUPPORTED_1000baseT_Half;
	} else
		supported = SUPPORTED_1000baseT_Full | SUPPORTED_1000baseT_Half
			| SUPPORTED_FIBRE | SUPPORTED_Autoneg;

	return supported;
}

static int skge_get_settings(struct net_device *dev,
			     struct ethtool_cmd *ecmd)
{
	struct skge_port *skge = netdev_priv(dev);
	struct skge_hw *hw = skge->hw;

	ecmd->transceiver = XCVR_INTERNAL;
	ecmd->supported = skge_supported_modes(hw);

	if (hw->copper) {
		ecmd->port = PORT_TP;
		ecmd->phy_address = hw->phy_addr;
	} else
		ecmd->port = PORT_FIBRE;

	ecmd->advertising = skge->advertising;
	ecmd->autoneg = skge->autoneg;
	ecmd->speed = skge->speed;
	ecmd->duplex = skge->duplex;
	return 0;
}

static int skge_set_settings(struct net_device *dev, struct ethtool_cmd *ecmd)
{
	struct skge_port *skge = netdev_priv(dev);
	const struct skge_hw *hw = skge->hw;
	u32 supported = skge_supported_modes(hw);

	if (ecmd->autoneg == AUTONEG_ENABLE) {
		ecmd->advertising = supported;
		skge->duplex = -1;
		skge->speed = -1;
	} else {
		u32 setting;

		switch (ecmd->speed) {
		case SPEED_1000:
			if (ecmd->duplex == DUPLEX_FULL)
				setting = SUPPORTED_1000baseT_Full;
			else if (ecmd->duplex == DUPLEX_HALF)
				setting = SUPPORTED_1000baseT_Half;
			else
				return -EINVAL;
			break;
		case SPEED_100:
			if (ecmd->duplex == DUPLEX_FULL)
				setting = SUPPORTED_100baseT_Full;
			else if (ecmd->duplex == DUPLEX_HALF)
				setting = SUPPORTED_100baseT_Half;
			else
				return -EINVAL;
			break;

		case SPEED_10:
			if (ecmd->duplex == DUPLEX_FULL)
				setting = SUPPORTED_10baseT_Full;
			else if (ecmd->duplex == DUPLEX_HALF)
				setting = SUPPORTED_10baseT_Half;
			else
				return -EINVAL;
			break;
		default:
			return -EINVAL;
		}

		if ((setting & supported) == 0)
			return -EINVAL;

		skge->speed = ecmd->speed;
		skge->duplex = ecmd->duplex;
	}

	skge->autoneg = ecmd->autoneg;
	skge->advertising = ecmd->advertising;

	if (netif_running(dev))
		skge_phy_reset(skge);

	return (0);
}

static void skge_get_drvinfo(struct net_device *dev,
			     struct ethtool_drvinfo *info)
{
	struct skge_port *skge = netdev_priv(dev);

	strcpy(info->driver, DRV_NAME);
	strcpy(info->version, DRV_VERSION);
	strcpy(info->fw_version, "N/A");
	strcpy(info->bus_info, pci_name(skge->hw->pdev));
}

static const struct skge_stat {
	char 	   name[ETH_GSTRING_LEN];
	u16	   xmac_offset;
	u16	   gma_offset;
} skge_stats[] = {
	{ "tx_bytes",		XM_TXO_OK_HI,  GM_TXO_OK_HI },
	{ "rx_bytes",		XM_RXO_OK_HI,  GM_RXO_OK_HI },

	{ "tx_broadcast",	XM_TXF_BC_OK,  GM_TXF_BC_OK },
	{ "rx_broadcast",	XM_RXF_BC_OK,  GM_RXF_BC_OK },
	{ "tx_multicast",	XM_TXF_MC_OK,  GM_TXF_MC_OK },
	{ "rx_multicast",	XM_RXF_MC_OK,  GM_RXF_MC_OK },
	{ "tx_unicast",		XM_TXF_UC_OK,  GM_TXF_UC_OK },
	{ "rx_unicast",		XM_RXF_UC_OK,  GM_RXF_UC_OK },
	{ "tx_mac_pause",	XM_TXF_MPAUSE, GM_TXF_MPAUSE },
	{ "rx_mac_pause",	XM_RXF_MPAUSE, GM_RXF_MPAUSE },

	{ "collisions",		XM_TXF_SNG_COL, GM_TXF_SNG_COL },
	{ "multi_collisions",	XM_TXF_MUL_COL, GM_TXF_MUL_COL },
	{ "aborted",		XM_TXF_ABO_COL, GM_TXF_ABO_COL },
	{ "late_collision",	XM_TXF_LAT_COL, GM_TXF_LAT_COL },
	{ "fifo_underrun",	XM_TXE_FIFO_UR, GM_TXE_FIFO_UR },
	{ "fifo_overflow",	XM_RXE_FIFO_OV, GM_RXE_FIFO_OV },

	{ "rx_toolong",		XM_RXF_LNG_ERR, GM_RXF_LNG_ERR },
	{ "rx_jabber",		XM_RXF_JAB_PKT, GM_RXF_JAB_PKT },
	{ "rx_runt",		XM_RXE_RUNT, 	GM_RXE_FRAG },
	{ "rx_too_long",	XM_RXF_LNG_ERR, GM_RXF_LNG_ERR },
	{ "rx_fcs_error",	XM_RXF_FCS_ERR, GM_RXF_FCS_ERR },
};

static int skge_get_sset_count(struct net_device *dev, int sset)
{
	switch (sset) {
	case ETH_SS_STATS:
		return ARRAY_SIZE(skge_stats);
	default:
		return -EOPNOTSUPP;
	}
}

static void skge_get_ethtool_stats(struct net_device *dev,
				   struct ethtool_stats *stats, u64 *data)
{
	struct skge_port *skge = netdev_priv(dev);

	if (skge->hw->chip_id == CHIP_ID_GENESIS)
		genesis_get_stats(skge, data);
	else
		yukon_get_stats(skge, data);
}

/* Use hardware MIB variables for critical path statistics and
 * transmit feedback not reported at interrupt.
 * Other errors are accounted for in interrupt handler.
 */
static struct net_device_stats *skge_get_stats(struct net_device *dev)
{
	struct skge_port *skge = netdev_priv(dev);
	u64 data[ARRAY_SIZE(skge_stats)];

	if (skge->hw->chip_id == CHIP_ID_GENESIS)
		genesis_get_stats(skge, data);
	else
		yukon_get_stats(skge, data);

	dev->stats.tx_bytes = data[0];
	dev->stats.rx_bytes = data[1];
	dev->stats.tx_packets = data[2] + data[4] + data[6];
	dev->stats.rx_packets = data[3] + data[5] + data[7];
	dev->stats.multicast = data[3] + data[5];
	dev->stats.collisions = data[10];
	dev->stats.tx_aborted_errors = data[12];

	return &dev->stats;
}

static void skge_get_strings(struct net_device *dev, u32 stringset, u8 *data)
{
	int i;

	switch (stringset) {
	case ETH_SS_STATS:
		for (i = 0; i < ARRAY_SIZE(skge_stats); i++)
			memcpy(data + i * ETH_GSTRING_LEN,
			       skge_stats[i].name, ETH_GSTRING_LEN);
		break;
	}
}

static void skge_get_ring_param(struct net_device *dev,
				struct ethtool_ringparam *p)
{
	struct skge_port *skge = netdev_priv(dev);

	p->rx_max_pending = MAX_RX_RING_SIZE;
	p->tx_max_pending = MAX_TX_RING_SIZE;
	p->rx_mini_max_pending = 0;
	p->rx_jumbo_max_pending = 0;

	p->rx_pending = skge->rx_ring.count;