/*
 * Copyright (c) 2007 Freescale Semiconductor, Inc. All rights reserved.
 *
 * Description: QE UCC Gigabit Ethernet Ethtool API Set
 *
 * Author: Li Yang <leoli@freescale.com>
 *
 * Limitation:
 * Can only get/set setttings of the first queue.
 * Need to re-open the interface manually after changing some parameters.
 *
 * 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.
 */

#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/errno.h>
#include <linux/slab.h>
#include <linux/stddef.h>
#include <linux/interrupt.h>
#include <linux/netdevice.h>
#include <linux/etherdevice.h>
#include <linux/skbuff.h>
#include <linux/spinlock.h>
#include <linux/mm.h>
#include <linux/delay.h>
#include <linux/dma-mapping.h>
#include <linux/ethtool.h>
#include <linux/mii.h>
#include <linux/phy.h>

#include <asm/io.h>
#include <asm/irq.h>
#include <asm/uaccess.h>
#include <asm/types.h>

#include "ucc_geth.h"

static char hw_stat_gstrings[][ETH_GSTRING_LEN] = {
	"tx-64-frames",
	"tx-65-127-frames",
	"tx-128-255-frames",
	"rx-64-frames",
	"rx-65-127-frames",
	"rx-128-255-frames",
	"tx-bytes-ok",
	"tx-pause-frames",
	"tx-multicast-frames",
	"tx-broadcast-frames",
	"rx-frames",
	"rx-bytes-ok",
	"rx-bytes-all",
	"rx-multicast-frames",
	"rx-broadcast-frames",
	"stats-counter-carry",
	"stats-counter-mask",
	"rx-dropped-frames",
};

static char tx_fw_stat_gstrings[][ETH_GSTRING_LEN] = {
	"tx-single-collision",
	"tx-multiple-collision",
	"tx-late-collsion",
	"tx-aborted-frames",
	"tx-lost-frames",
	"tx-carrier-sense-errors",
	"tx-frames-ok",
	"tx-excessive-differ-frames",
	"tx-256-511-frames",
	"tx-512-1023-frames",
	"tx-1024-1518-frames",
	"tx-jumbo-frames",
};

static char rx_fw_stat_gstrings[][ETH_GSTRING_LEN] = {
	"rx-crc-errors",
	"rx-alignment-errors",
	"rx-in-range-length-errors",
	"rx-out-of-range-length-errors",
	"rx-too-long-frames",
	"rx-runt",
	"rx-very-long-event",
	"rx-symbol-errors",
	"rx-busy-drop-frames",
	"reserved",
	"reserved",
	"rx-mismatch-drop-frames",
	"rx-small-than-64",
	"rx-256-511-frames",
	"rx-512-1023-frames",
	"rx-1024-1518-frames",
	"rx-jumbo-frames",
	"rx-mac-error-loss",
	"rx-pause-frames",
	"reserved",
	"rx-vlan-removed",
	"rx-vlan-replaced",
	"rx-vlan-inserted",
	"rx-ip-checksum-errors",
};

#define UEC_HW_STATS_LEN ARRAY_SIZE(hw_stat_gstrings)
#define UEC_TX_FW_STATS_LEN ARRAY_SIZE(tx_fw_stat_gstrings)
#define UEC_RX_FW_STATS_LEN ARRAY_SIZE(rx_fw_stat_gstrings)

static int
uec_get_settings(struct net_device *netdev, struct ethtool_cmd *ecmd)
{
	struct ucc_geth_private *ugeth = netdev_priv(netdev);
	struct phy_device *phydev = ugeth->phydev;
	struct ucc_geth_info *ug_info = ugeth->ug_info;

	if (!phydev)
		return -ENODEV;

	ecmd->maxtxpkt = 1;
	ecmd->maxrxpkt = ug_info->interruptcoalescingmaxvalue[0];

	return phy_ethtool_gset(phydev, ecmd);
}

static int
uec_set_settings(struct net_device *netdev, struct ethtool_cmd *ecmd)
{
	struct ucc_geth_private *ugeth = netdev_priv(netdev);
	struct phy_device *phydev = ugeth->phydev;

	if (!phydev)
		return -ENODEV;

	return phy_ethtool_sset(phydev, ecmd);
}

static void
uec_get_pauseparam(struct net_device *netdev,
                     struct ethtool_pauseparam *pause)
{
	struct ucc_geth_private *ugeth = netdev_priv(netdev);

	pause->autoneg = ugeth->phydev->autoneg;

	if (ugeth->ug_info->receiveFlowControl)
		pause->rx_pause = 1;
	if (ugeth->ug_info->transmitFlowControl)
		pause->tx_pause = 1;
}

static int
uec_set_pauseparam(struct net_device *netdev,
                     struct ethtool_pauseparam *pause)
{
	struct ucc_geth_private *ugeth = netdev_priv(netdev);
	int ret = 0;

	ugeth->ug_info->receiveFlowControl = pause->rx_pause;
	ugeth->ug_info->transmitFlowControl = pause->tx_pause;

	if (ugeth->phydev->autoneg) {
		if (netif_running(netdev)) {
			/* FIXME: automatically restart */
			printk(KERN_INFO
				"Please re-open the interface.\n");
		}
	} else {
		struct ucc_geth_info *ug_info = ugeth->ug_info;

		ret = init_flow_control_params(ug_info->aufc,
					ug_info->receiveFlowControl,
					ug_info->transmitFlowControl,
					ug_info->pausePeriod,
					ug_info->extensionField,
					&ugeth->uccf->uf_regs->upsmr,
					&ugeth->ug_regs->uempr,
					&ugeth->ug_regs->maccfg1);
	}

	return ret;
}

static uint32_t
uec_get_msglevel(struct net_device *netdev)
{
	struct ucc_geth_private *ugeth = netdev_priv(netdev);
	return ugeth->msg_enable;
}

static void
uec_set_msglevel(struct net_device *netdev, uint32_t data)
{
	struct ucc_geth_private *ugeth = netdev_priv(netdev);
	ugeth->msg_enable = data;
}

static int
uec_get_regs_len(struct net_device *netdev)
{
	return sizeof(struct ucc_geth);
}

static void
uec_get_regs(struct net_device *netdev,
               struct ethtool_regs *regs, void *p)
{
	int i;
	struct ucc_geth_private *ugeth = netdev_priv(netdev);
	u32 __iomem *ug_regs = (u32 __iomem *)ugeth->ug_regs;
	u32 *buff = p;

	for (i = 0; i < sizeof(struct ucc_geth) / sizeof(u32); i++)
		buff[i] = in_be32(&ug_regs[i]);
}

static void
uec_get_ringparam(struct net_device *netdev,
                    struct ethtool_ringparam *ring)
{
	struct ucc_geth_private *ugeth = netdev_priv(netdev);
	struct ucc_geth_info *ug_info = ugeth->ug_info;
	int queue = 0;

	ring->rx_max_pending = UCC_GETH_BD_RING_SIZE_MAX;
	ring->rx_mini_max_pending = UCC_GETH_BD_RING_SIZE_MAX;
	ring->rx_jumbo_max_pending = UCC_GETH_BD_RING_SIZE_MAX;
	ring->tx_max_pending = UCC_GETH_BD_RING_SIZE_MAX;

	ring->rx_pending = ug_info->bdRingLenRx[queue];
	ring->rx_mini_pending = ug_info->bdRingLenRx[queue];
	ring->rx_jumbo_pending = ug_info->bdRingLenRx[queue];
	ring->tx_pending = ug_info->bdRingLenTx[queue];
}

static int
uec_set_ringparam(struct net_device *netdev,
                    struct ethtool_ringparam *ring)
{
	struct ucc_geth_private *ugeth = netdev_priv(netdev);
	struct ucc_geth_info *ug_info = ugeth->ug_info;
	int queue = 0, ret = 0;

	if (ring->rx_pending < UCC_GETH_RX_BD_RING_SIZE_MIN) {
		printk("%s: RxBD ring size must be no smaller than %d.\n",
			       	netdev->name, UCC_GETH_RX_BD_RING_SIZE_MIN);
		return -EINVAL;
	}
	if (ring->rx_pending % UCC_GETH_RX_BD_RING_SIZE_ALIGNMENT) {
		printk("%s: RxBD ring size must be multiple of %d.\n",
			netdev->name, UCC_GETH_RX_BD_RING_SIZE_ALIGNMENT);
		return -EINVAL;
	}
	if (ring->tx_pending < UCC_GETH_TX_BD_RING_SIZE_MIN) {
		printk("%s: TxBD ring size must be no smaller than %d.\n",
				netdev->name, UCC_GETH_TX_BD_RING_SIZE_MIN);
		return -EINVAL;
	}

	ug_info->bdRingLenRx[queue] = ring->rx_pending;
	ug_info->bdRingLenTx[queue] = ring->tx_pending;

	if (netif_running(netdev)) {
		/* FIXME: restart automatically */
		printk(KERN_INFO
			"Please re-open the interface.\n");
	}

	return ret;
}

static int uec_get_sset_count(struct net_device *netdev, int sset)
{
	struct ucc_geth_private *ugeth = netdev_priv(netdev);
	u32 stats_mode = ugeth->ug_info->statisticsMode;
	int len = 0;

	switch (sset) {
	case ETH_SS_STATS:
		if (stats_mode & UCC_GETH_STATISTICS_GATHERING_MODE_HARDWARE)
			len += UEC_HW_STATS_LEN;
		if (stats_mode & UCC_GETH_STATISTICS_GATHERING_MODE_FIRMWARE_TX)
			len += UEC_TX_FW_STATS_LEN;
		if (stats_mode & UCC_GETH_STATISTICS_GATHERING_MODE_FIRMWARE_RX)
			len += UEC_RX_FW_STATS_LEN;

		return len;

	default:
		return -EOPNOTSUPP;
	}
}

static void uec_get_strings(struct net_device *netdev, u32 stringset, u8 *buf)
{
	struct ucc_geth_private *ugeth = netdev_priv(netdev);
	u32 stats_mode = ugeth->ug_info->statisticsMode;

	if (stats_mode & UCC_GETH_STATISTICS_GATHERING_MODE_HARDWARE) {
		memcpy(buf, hw_stat_gstrings, UEC_HW_STATS_LEN *
			       	ETH_GSTRING_LEN);
		buf += UEC_HW_STATS_LEN * ETH_GSTRING_LEN;
	}
	if (stats_mode & UCC_GETH_STATISTICS_GATHERING_MODE_FIRMWARE_TX) {
		memcpy(buf, tx_fw_stat_gstrings, UEC_TX_FW_STATS_LEN *
			       	ETH_GSTRING_LEN);
		buf += UEC_TX_FW_STATS_LEN * ETH_GSTRING_LEN;
	}
	if (stats_mode & UCC_GETH_STATISTICS_GATHERING_MODE_FIRMWARE_RX)
		memcpy(buf, rx_fw_stat_gstrings, UEC_RX_FW_STATS_LEN *
			       	ETH_GSTRING_LEN);
}

static void uec_get_ethtool_stats(struct net_device *netdev,
		struct ethtool_stats *stats, uint64_t *data)
{
	struct ucc_geth_private *ugeth = netdev_priv(netdev);
	u32 stats_mode = ugeth->ug_info->statisticsMode;
	u32 __iomem *base;
	int i, j = 0;

	if (stats_mode & UCC_GETH_STATISTICS_GATHERING_MODE_HARDWARE) {
		base = (u32 __iomem *)&ugeth->ug_regs->tx64;
		for (i = 0; i < UEC_HW_STATS_LEN; i++)
			data[j++] = in_be32(&base[i]);
	}
	if (stats_mode & UCC_GETH_STATISTICS_GATHERING_MODE_FIRMWARE_TX) {
		base = (u32 __iomem *)ugeth->p_tx_fw_statistics_pram;
		for (i = 0; i < UEC_TX_FW_STATS_LEN; i++)
			data[j++] = base ? in_be32(&base[i]) : 0;
	}
	if (stats_mode & UCC_GETH_STATISTICS_GATHERING_MODE_FIRMWARE_RX) {
		base = (u32 __iomem *)ugeth->p_rx_fw_statistics_pram;
		for (i = 0; i < UEC_RX_FW_STATS_LEN; i++)
			data[j++] = base ? in_be32(&base[i]) : 0;
	}
}

static int uec_nway_reset(struct net_device *netdev)
{
	struct ucc_geth_private *ugeth = netdev_priv(netdev);

	return phy_start_aneg(ugeth->phydev);
}

/* Report driver information */
static void
uec_get_drvinfo(struct net_device *netdev,
                       struct ethtool_drvinfo *drvinfo)
{
	strncpy(drvinfo->driver, DRV_NAME, 32);
	strncpy(drvinfo->version, DRV_VERSION, 32);
	strncpy(drvinfo->fw_version, "N/A", 32);
	strncpy(drvinfo->bus_info, "QUICC ENGINE", 32);
	drvinfo->eedump_len = 0;
	drvinfo->regdump_len = uec_get_regs_len(netdev);
}

static const struct ethtool_ops uec_ethtool_ops = {
	.get_settings           = uec_get_settings,
	.set_settings           = uec_set_settings,
	.get_drvinfo            = uec_get_drvinfo,
	.get_regs_len           = uec_get_regs_len,
	.get_regs               = uec_get_regs,
	.get_msglevel           = uec_get_msglevel,
	.set_msglevel           = uec_set_msglevel,
	.nway_reset             = uec_nway_reset,
	.get_link               = ethtool_op_get_link,
	.get_ringparam          = uec_get_ringparam,
	.set_ringparam          = uec_set_ringparam,
	.get_pauseparam         = uec_get_pauseparam,
	.set_pauseparam         = uec_set_pauseparam,
	.set_sg                 = ethtool_op_set_sg,
	.get_sset_count		= uec_get_sset_count,
	.get_strings            = uec_get_strings,
	.get_ethtool_stats      = uec_get_ethtool_stats,
};

void uec_set_ethtool_ops(struct net_device *netdev)
{
	SET_ETHTOOL_OPS(netdev, &uec_ethtool_ops);
}