/*
 **************************************************************************
 * Copyright (c) 2016-2021, The Linux Foundation. All rights reserved.
 *
 * Copyright (c) 2022-2023 Qualcomm Innovation Center, Inc. All rights reserved.
 *
 * Permission to use, copy, modify, and/or distribute this software for
 * any purpose with or without fee is hereby granted, provided that the
 * above copyright notice and this permission notice appear in all copies.
 *
 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT
 * OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
 **************************************************************************
 */

#include <linux/delay.h>
#include <linux/ethtool.h>
#include <linux/vmalloc.h>
#include <linux/spinlock.h>
#include <linux/io.h>
#include <nss_dp_dev.h>
#include "syn_dev.h"

#define SYN_STAT(m)		offsetof(struct nss_dp_hal_gmac_stats, m)
#define SYN_XMIB_STAT(m)	offsetof(fal_xgmib_info_t, m)

struct syn_ethtool_stats {
	uint8_t stat_string[ETH_GSTRING_LEN];
	uint64_t stat_offset;
};

/*
 * Array of strings describing data plane statistics
 */
static const struct syn_ethtool_stats syn_gstrings_stats[] = {
#if defined(NSS_DP_EDMA_V2)
	/*
	 * Per GMAC DMA driver statistics are
	 * supported only for IPQ95xx and IPQ53xx.
	 */
	{"rx_bytes", SYN_STAT(rx_bytes)},
	{"rx_packets", SYN_STAT(rx_packets)},
	{"rx_dropped", SYN_STAT(rx_dropped)},
	{"rx_fraglist_packets", SYN_STAT(rx_fraglist_packets)},
	{"rx_nr_frag_packets", SYN_STAT(rx_nr_frag_packets)},
	{"rx_nr_frag_headroom_err", SYN_STAT(rx_nr_frag_headroom_err)},
	{"tx_bytes", SYN_STAT(tx_bytes)},
	{"tx_packets", SYN_STAT(tx_packets)},
	{"tx_dropped", SYN_STAT(tx_dropped)},
	{"tx_nr_frag_packets", SYN_STAT(tx_nr_frag_packets)},
	{"tx_fraglist_packets", SYN_STAT(tx_fraglist_packets)},
	{"tx_fraglist_nr_frags_packets", SYN_STAT(tx_fraglist_with_nr_frags_packets)},
	{"tx_tso_packets", SYN_STAT(tx_tso_packets)},
	{"tx_tso_drop_packets", SYN_STAT(tx_tso_drop_packets)},
	{"tx_gso_packets", SYN_STAT(tx_gso_packets)},
	{"tx_gso_drop_packets", SYN_STAT(tx_gso_drop_packets)},
#endif
};

/*
 * Array of strings describing xmib statistics
 */
static const struct syn_ethtool_stats syn_gstrings_xmib_stats[] = {
	{"rx_frame", SYN_XMIB_STAT(RxFrame)},
	{"rx_bytes", SYN_XMIB_STAT(RxByte)},
	{"rx_bytes_g", SYN_XMIB_STAT(RxByteGood)},
	{"rx_broadcast", SYN_XMIB_STAT(RxBroadGood)},
	{"rx_multicast", SYN_XMIB_STAT(RxMultiGood)},
	{"rx_crc_err", SYN_XMIB_STAT(RxFcsErr)},
	{"rx_runt_err", SYN_XMIB_STAT(RxRuntErr)},
	{"rx_jabber_err", SYN_XMIB_STAT(RxJabberError)},
	{"rx_undersize", SYN_XMIB_STAT(RxUndersizeGood)},
	{"rx_oversize", SYN_XMIB_STAT(RxOversizeGood)},
	{"rx_pkt64", SYN_XMIB_STAT(Rx64Byte)},
	{"rx_pkt65to127", SYN_XMIB_STAT(Rx128Byte)},
	{"rx_pkt128to255", SYN_XMIB_STAT(Rx256Byte)},
	{"rx_pkt256to511", SYN_XMIB_STAT(Rx512Byte)},
	{"rx_pkt512to1023", SYN_XMIB_STAT(Rx1024Byte)},
	{"rx_pkt1024tomax", SYN_XMIB_STAT(RxMaxByte)},
	{"rx_unicast", SYN_XMIB_STAT(RxUnicastGood)},
	{"rx_len_err", SYN_XMIB_STAT(RxLengthError)},
	{"rx_outofrange_err_ctr", SYN_XMIB_STAT(RxOutOfRangeError)},
	{"rx_pause", SYN_XMIB_STAT(RxPause)},
	{"rx_fifo_overflow", SYN_XMIB_STAT(RxOverFlow)},
	{"rx_vlan", SYN_XMIB_STAT(RxVLANFrameGoodBad)},
	{"rx_wdog", SYN_XMIB_STAT(RxWatchDogError)},
	{"rx_lpi_usec_ctr", SYN_XMIB_STAT(RxLPIUsec)},
	{"rx_lpi_tran_ctr", SYN_XMIB_STAT(RxLPITran)},
	{"rx_drop_frame_ctr", SYN_XMIB_STAT(RxDropFrameGoodBad)},
	{"rx_drop_byte_ctr", SYN_XMIB_STAT(RxDropByteGoodBad)},
	{"tx_bytes", SYN_XMIB_STAT(TxByte)},
	{"tx_frame", SYN_XMIB_STAT(TxFrame)},
	{"tx_broadcast", SYN_XMIB_STAT(TxBroadGood)},
	{"tx_broadcast_gb", SYN_XMIB_STAT(TxBroad)},
	{"tx_multicast", SYN_XMIB_STAT(TxMultiGood)},
	{"tx_multicast_gb", SYN_XMIB_STAT(TxMulti)},
	{"tx_pkt64", SYN_XMIB_STAT(Tx64Byte)},
	{"tx_pkt65to127", SYN_XMIB_STAT(Tx128Byte)},
	{"tx_pkt128to255", SYN_XMIB_STAT(Tx256Byte)},
	{"tx_pkt256to511", SYN_XMIB_STAT(Tx512Byte)},
	{"tx_pkt512to1023", SYN_XMIB_STAT(Tx1024Byte)},
	{"tx_pkt1024tomax", SYN_XMIB_STAT(TxMaxByte)},
	{"tx_unicast", SYN_XMIB_STAT(TxUnicast)},
	{"tx_underflow_err", SYN_XMIB_STAT(TxUnderFlowError)},
	{"tx_bytes_g", SYN_XMIB_STAT(TxByteGood)},
	{"tx_frame_g", SYN_XMIB_STAT(TxFrameGood)},
	{"tx_pause", SYN_XMIB_STAT(TxPause)},
	{"tx_vlan", SYN_XMIB_STAT(TxVLANFrameGood)},
	{"tx_lpi_usec_ctr", SYN_XMIB_STAT(TxLPIUsec)},
	{"tx_lpi_tran_ctr", SYN_XMIB_STAT(TxLPITran)},
};

/*
 * Array of strings describing private flag names
 */
static const char *const syn_strings_priv_flags[] = {
	"test",
};

#define SYN_STATS_LEN		ARRAY_SIZE(syn_gstrings_stats)
#define SYN_MIB_STATS_LEN	ARRAY_SIZE(syn_gstrings_xmib_stats)
#define SYN_PRIV_FLAGS_LEN	ARRAY_SIZE(syn_strings_priv_flags)

/*
 * syn_rx_flow_control()
 */
static void syn_rx_flow_control(struct nss_gmac_hal_dev *nghd,
				     bool enabled)
{
	BUG_ON(nghd == NULL);

	if (enabled)
		syn_set_rx_flow_ctrl(nghd);
	else
		syn_clear_rx_flow_ctrl(nghd);
}

/*
 * syn_tx_flow_control()
 */
static void syn_tx_flow_control(struct nss_gmac_hal_dev *nghd,
				     bool enabled)
{
	BUG_ON(nghd == NULL);

	if (enabled)
		syn_set_tx_flow_ctrl(nghd);
	else
		syn_clear_tx_flow_ctrl(nghd);
}

/*
 * syn_get_max_frame_size()
 */
static int32_t syn_get_max_frame_size(struct nss_gmac_hal_dev *nghd)
{
	int ret;
	uint32_t mtu;

	ret = fal_port_max_frame_size_get(0, nghd->mac_id, &mtu);

	if (!ret)
		return mtu;

	return ret;
}

/*
 * syn_set_max_frame_size()
 */
static int32_t syn_set_max_frame_size(struct nss_gmac_hal_dev *nghd,
					uint32_t maxframe)
{
	/*
	 * Check for maximum allowable MTU.
	 */
	BUG_ON(nghd == NULL);

	if (maxframe > SYN_HAL_MAX_MTU_SIZE) {
		netdev_warn(nghd->netdev, "Maximum allowed MTU: %d\n", SYN_HAL_MAX_MTU_SIZE);
		return -1;
	}

	return 0;
}

/*
 * syn_get_netdev_stats()
 */
static int syn_get_netdev_stats(struct nss_gmac_hal_dev *nghd,
		struct rtnl_link_stats64 *stats)
{
	fal_xgmib_info_t hal_stats;

	BUG_ON(nghd == NULL);

	memset(&hal_stats, 0, sizeof(fal_xgmib_info_t));
	if (syn_get_xmib_stats(nghd, &hal_stats)) {
		return -1;
	}

	stats->rx_packets = hal_stats.RxUnicastGood
		+ hal_stats.RxBroadGood + hal_stats.RxMultiGood;
	stats->tx_packets = hal_stats.TxUnicast
		+ hal_stats.TxBroadGood + hal_stats.TxMultiGood;
	stats->rx_bytes = hal_stats.RxByte;
	stats->tx_bytes = hal_stats.TxByte;
	stats->multicast = hal_stats.RxMultiGood;

	/*
	 * Rx error
	 */
	stats->rx_crc_errors = hal_stats.RxFcsErr;
	stats->rx_frame_errors = hal_stats.RxRuntErr;
	stats->rx_fifo_errors = hal_stats.RxOverFlow;
	stats->rx_length_errors = hal_stats.RxLengthError;
	stats->rx_errors = stats->rx_crc_errors + stats->rx_frame_errors
		+ stats->rx_fifo_errors + stats->rx_length_errors;
	stats->rx_dropped = hal_stats.RxDropFrameGoodBad + stats->rx_errors;

	/*
	 * Tx error
	 */
	stats->tx_fifo_errors = hal_stats.TxUnderFlowError + hal_stats.RxOverFlow;
	stats->tx_errors = stats->tx_fifo_errors;

	return 0;
}

/*
 * syn_get_eth_stats()
 */
static int32_t syn_get_eth_stats(struct nss_gmac_hal_dev *nghd,
				   uint64_t *data, struct nss_dp_gmac_stats *stats)
{
	fal_xgmib_info_t mib_stats;
	uint8_t *p = NULL;
	int i, i_mib;

	BUG_ON(nghd == NULL);

	/*
	 * Populate data plane statistics.
	 */
	for (i = 0; i < SYN_STATS_LEN; i++) {
		p = ((uint8_t *)(stats) + syn_gstrings_stats[i].stat_offset);
		data[i] = *(uint64_t *)p;
	}

	/*
	 * Get MIB statistics
	 */
	memset(&mib_stats, 0, sizeof(fal_xgmib_info_t));
	if (syn_get_xmib_stats(nghd, &mib_stats)) {
		return -1;
	}

	/*
	 * Populate MIB statistics
	 */
	for (i_mib = 0; i_mib < SYN_MIB_STATS_LEN; i_mib++) {
		p = ((uint8_t *)(&mib_stats) +
			syn_gstrings_xmib_stats[i_mib].stat_offset);
		i = SYN_STATS_LEN + i_mib;
		data[i] = *(uint32_t *)p;
	}

	return 0;
}

/*
 * syn_get_strset_count()
 */
static int32_t syn_get_strset_count(struct nss_gmac_hal_dev *nghd,
					 int32_t sset)
{
	struct net_device *netdev;

	BUG_ON(nghd == NULL);

	netdev = nghd->netdev;

	switch (sset) {
	case ETH_SS_STATS:
		return (SYN_STATS_LEN + SYN_MIB_STATS_LEN);

	case ETH_SS_PRIV_FLAGS:
		return SYN_PRIV_FLAGS_LEN;
	}

	netdev_dbg(netdev, "%s: Invalid string set\n", __func__);
	return -EPERM;
}

/*
 * syn_get_strings()
 */
static int32_t syn_get_strings(struct nss_gmac_hal_dev *nghd,
				    int32_t stringset, uint8_t *data)
{
	struct net_device *netdev;
	int i;

	BUG_ON(nghd == NULL);

	netdev = nghd->netdev;

	switch (stringset) {
	case ETH_SS_STATS:
		for (i = 0; i < SYN_STATS_LEN; i++) {
			memcpy(data, syn_gstrings_stats[i].stat_string,
				strlen(syn_gstrings_stats[i].stat_string));
			data += ETH_GSTRING_LEN;
		}

		for (i = 0; i < SYN_MIB_STATS_LEN; i++) {
			memcpy(data, syn_gstrings_xmib_stats[i].stat_string,
				strlen(syn_gstrings_xmib_stats[i].stat_string));
			data += ETH_GSTRING_LEN;
		}

		break;

	case ETH_SS_PRIV_FLAGS:
		for (i = 0; i < SYN_PRIV_FLAGS_LEN; i++) {
			memcpy(data, syn_strings_priv_flags[i],
				strlen(syn_strings_priv_flags[i]));
			data += ETH_GSTRING_LEN;
		}

		break;

	default:
		netdev_dbg(netdev, "%s: Invalid string set\n", __func__);
		return -EPERM;
	}

	return 0;
}

/*
 * syn_send_pause_frame()
 */
static void syn_send_pause_frame(struct nss_gmac_hal_dev *nghd)
{
	BUG_ON(nghd == NULL);

	syn_send_tx_pause_frame(nghd);
}

/*
 * syn_init()
 */
static void *syn_init(struct nss_gmac_hal_platform_data *gmacpdata)
{
	struct syn_hal_dev *shd = NULL;
	struct net_device *ndev = NULL;
	struct nss_dp_dev *dp_priv = NULL;
	struct resource *res;

	ndev = gmacpdata->netdev;
	dp_priv = netdev_priv(ndev);

	res = platform_get_resource(dp_priv->pdev, IORESOURCE_MEM, 0);
	if (!res) {
		netdev_dbg(ndev, "Resource get failed.\n");
		return NULL;
	}

	shd = (struct syn_hal_dev *)devm_kzalloc(&dp_priv->pdev->dev,
					sizeof(struct syn_hal_dev),
					GFP_KERNEL);
	if (!shd) {
		netdev_dbg(ndev, "kzalloc failed. Returning...\n");
		return NULL;
	}

	shd->nghd.mac_reg_len = resource_size(res);
	shd->nghd.memres = devm_request_mem_region(&dp_priv->pdev->dev,
							res->start,
							resource_size(res),
							ndev->name);
	if (!shd->nghd.memres) {
		netdev_dbg(ndev, "Request mem region failed. Returning.\n");
		devm_kfree(&dp_priv->pdev->dev, shd);
		return NULL;
	}

	/* Save netdev context in syn HAL context */
	shd->nghd.netdev = gmacpdata->netdev;
	shd->nghd.mac_id = gmacpdata->macid;

	/* Populate the mac base addresses */
	shd->nghd.mac_base = devm_ioremap(&dp_priv->pdev->dev, res->start,
			resource_size(res));
	if (!shd->nghd.mac_base) {
		netdev_dbg(ndev, "ioremap fail.\n");
		devm_release_mem_region(&dp_priv->pdev->dev,
				shd->nghd.memres->start,
				shd->nghd.mac_reg_len);
		devm_kfree(&dp_priv->pdev->dev, shd);
		return NULL;
	}

	spin_lock_init(&shd->nghd.slock);

	netdev_dbg(ndev, "ioremap OK.Size 0x%x Ndev base 0x%lx macbase 0x%px\n",
			gmacpdata->reg_len,
			ndev->base_addr,
			shd->nghd.mac_base);

	/* Reset MIB Stats */
	if (fal_mib_port_flush_counters(0, shd->nghd.mac_id)) {
		netdev_dbg(ndev, "MIB stats Reset fail.\n");
	}

	return (struct nss_gmac_hal_dev *)shd;
}

/*
 * syn_set_mac_address()
 */
static void syn_set_mac_address(struct nss_gmac_hal_dev *nghd,
				     uint8_t *macaddr)
{
	uint32_t data;

	BUG_ON(nghd == NULL);

	data = (macaddr[5] << 8) | macaddr[4] | SYN_MAC_ADDR_RSVD_BIT;
	hal_write_relaxed_reg(nghd->mac_base, SYN_MAC_ADDR0_HIGH, data);
	data = (macaddr[3] << 24) | (macaddr[2] << 16) | (macaddr[1] << 8)
		| macaddr[0];
	hal_write_relaxed_reg(nghd->mac_base, SYN_MAC_ADDR0_LOW, data);
}

/*
 * syn_get_mac_address()
 */
static void syn_get_mac_address(struct nss_gmac_hal_dev *nghd,
				     uint8_t *macaddr)
{
	uint32_t data;

	BUG_ON(nghd == NULL);

	data = hal_read_relaxed_reg(nghd->mac_base, SYN_MAC_ADDR0_HIGH);
	macaddr[5] = (data >> 8) & 0xff;
	macaddr[4] = (data) & 0xff;

	data = hal_read_relaxed_reg(nghd->mac_base, SYN_MAC_ADDR0_LOW);
	macaddr[3] = (data >> 24) & 0xff;
	macaddr[2] = (data >> 16) & 0xff;
	macaddr[1] = (data >> 8) & 0xff;
	macaddr[0] = (data) & 0xff;
}

/*
 * syn_exit()
 */
static void syn_exit(struct nss_gmac_hal_dev *nghd)
{
	struct nss_dp_dev *dp_priv = NULL;
	struct syn_hal_dev *shd = (struct syn_hal_dev *)nghd;

	netdev_dbg(nghd->netdev, "Freeing up dev memory.\n");

	dp_priv = netdev_priv(nghd->netdev);
	devm_iounmap(&dp_priv->pdev->dev,
			(void *)nghd->mac_base);
	devm_release_mem_region(&dp_priv->pdev->dev,
			(nghd->memres)->start,
			nghd->mac_reg_len);

	nghd->memres = NULL;
	nghd->mac_base = NULL;

	devm_kfree(&dp_priv->pdev->dev, shd);
}

/*
 * MAC hal_ops base structure
 */
struct nss_gmac_hal_ops syn_gmac_ops = {
	.init = &syn_init,
	.start = NULL,
	.stop = NULL,
	.exit = &syn_exit,
	.setmacaddr = &syn_set_mac_address,
	.getmacaddr = &syn_get_mac_address,
	.rxflowcontrol = &syn_rx_flow_control,
	.txflowcontrol = &syn_tx_flow_control,
	.setmaxframe = &syn_set_max_frame_size,
	.getmaxframe = &syn_get_max_frame_size,
	.getndostats = &syn_get_netdev_stats,
	.getssetcount = &syn_get_strset_count,
	.getstrings = &syn_get_strings,
	.getethtoolstats = &syn_get_eth_stats,
	.sendpause = &syn_send_pause_frame,
};
