// SPDX-License-Identifier: BSD-3-Clause OR GPL-2.0-or-later
/*
 * Copyright 2008 - 2015 Freescale Semiconductor Inc.
 */

#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt

#include <linux/init.h>
#include <linux/module.h>
#include <linux/of_address.h>
#include <linux/of_platform.h>
#include <linux/of_net.h>
#include <linux/of_mdio.h>
#include <linux/device.h>
#include <linux/phy.h>
#include <linux/netdevice.h>
#include <linux/phy_fixed.h>
#include <linux/etherdevice.h>
#include <linux/libfdt_env.h>

#include "mac.h"
#include "fman_mac.h"
#include "fman_dtsec.h"
#include "fman_tgec.h"
#include "fman_memac.h"

MODULE_LICENSE("Dual BSD/GPL");
MODULE_DESCRIPTION("FSL FMan MAC API based driver");

struct mac_priv_s {
	u8				cell_index;
	struct fman			*fman;
	/* List of multicast addresses */
	struct list_head		mc_addr_list;
	struct platform_device		*eth_dev;
	u16				speed;
};

struct mac_address {
	u8 addr[ETH_ALEN];
	struct list_head list;
};

static void mac_exception(struct mac_device *mac_dev,
			  enum fman_mac_exceptions ex)
{
	if (ex == FM_MAC_EX_10G_RX_FIFO_OVFL) {
		/* don't flag RX FIFO after the first */
		mac_dev->set_exception(mac_dev->fman_mac,
				       FM_MAC_EX_10G_RX_FIFO_OVFL, false);
		dev_err(mac_dev->dev, "10G MAC got RX FIFO Error = %x\n", ex);
	}

	dev_dbg(mac_dev->dev, "%s:%s() -> %d\n", KBUILD_BASENAME ".c",
		__func__, ex);
}

int fman_set_multi(struct net_device *net_dev, struct mac_device *mac_dev)
{
	struct mac_priv_s	*priv;
	struct mac_address	*old_addr, *tmp;
	struct netdev_hw_addr	*ha;
	int			err;
	enet_addr_t		*addr;

	priv = mac_dev->priv;

	/* Clear previous address list */
	list_for_each_entry_safe(old_addr, tmp, &priv->mc_addr_list, list) {
		addr = (enet_addr_t *)old_addr->addr;
		err = mac_dev->remove_hash_mac_addr(mac_dev->fman_mac, addr);
		if (err < 0)
			return err;

		list_del(&old_addr->list);
		kfree(old_addr);
	}

	/* Add all the addresses from the new list */
	netdev_for_each_mc_addr(ha, net_dev) {
		addr = (enet_addr_t *)ha->addr;
		err = mac_dev->add_hash_mac_addr(mac_dev->fman_mac, addr);
		if (err < 0)
			return err;

		tmp = kmalloc(sizeof(*tmp), GFP_ATOMIC);
		if (!tmp)
			return -ENOMEM;

		ether_addr_copy(tmp->addr, ha->addr);
		list_add(&tmp->list, &priv->mc_addr_list);
	}
	return 0;
}

/**
 * fman_set_mac_active_pause
 * @mac_dev:	A pointer to the MAC device
 * @rx:		Pause frame setting for RX
 * @tx:		Pause frame setting for TX
 *
 * Set the MAC RX/TX PAUSE frames settings
 *
 * Avoid redundant calls to FMD, if the MAC driver already contains the desired
 * active PAUSE settings. Otherwise, the new active settings should be reflected
 * in FMan.
 *
 * Return: 0 on success; Error code otherwise.
 */
int fman_set_mac_active_pause(struct mac_device *mac_dev, bool rx, bool tx)
{
	struct fman_mac *fman_mac = mac_dev->fman_mac;
	int err = 0;

	if (rx != mac_dev->rx_pause_active) {
		err = mac_dev->set_rx_pause(fman_mac, rx);
		if (likely(err == 0))
			mac_dev->rx_pause_active = rx;
	}

	if (tx != mac_dev->tx_pause_active) {
		u16 pause_time = (tx ? FSL_FM_PAUSE_TIME_ENABLE :
					 FSL_FM_PAUSE_TIME_DISABLE);

		err = mac_dev->set_tx_pause(fman_mac, 0, pause_time, 0);

		if (likely(err == 0))
			mac_dev->tx_pause_active = tx;
	}

	return err;
}
EXPORT_SYMBOL(fman_set_mac_active_pause);

/**
 * fman_get_pause_cfg
 * @mac_dev:	A pointer to the MAC device
 * @rx_pause:	Return value for RX setting
 * @tx_pause:	Return value for TX setting
 *
 * Determine the MAC RX/TX PAUSE frames settings based on PHY
 * autonegotiation or values set by eththool.
 *
 * Return: Pointer to FMan device.
 */
void fman_get_pause_cfg(struct mac_device *mac_dev, bool *rx_pause,
			bool *tx_pause)
{
	struct phy_device *phy_dev = mac_dev->phy_dev;
	u16 lcl_adv, rmt_adv;
	u8 flowctrl;

	*rx_pause = *tx_pause = false;

	if (!phy_dev->duplex)
		return;

	/* If PAUSE autonegotiation is disabled, the TX/RX PAUSE settings
	 * are those set by ethtool.
	 */
	if (!mac_dev->autoneg_pause) {
		*rx_pause = mac_dev->rx_pause_req;
		*tx_pause = mac_dev->tx_pause_req;
		return;
	}

	/* Else if PAUSE autonegotiation is enabled, the TX/RX PAUSE
	 * settings depend on the result of the link negotiation.
	 */

	/* get local capabilities */
	lcl_adv = linkmode_adv_to_lcl_adv_t(phy_dev->advertising);

	/* get link partner capabilities */
	rmt_adv = 0;
	if (phy_dev->pause)
		rmt_adv |= LPA_PAUSE_CAP;
	if (phy_dev->asym_pause)
		rmt_adv |= LPA_PAUSE_ASYM;

	/* Calculate TX/RX settings based on local and peer advertised
	 * symmetric/asymmetric PAUSE capabilities.
	 */
	flowctrl = mii_resolve_flowctrl_fdx(lcl_adv, rmt_adv);
	if (flowctrl & FLOW_CTRL_RX)
		*rx_pause = true;
	if (flowctrl & FLOW_CTRL_TX)
		*tx_pause = true;
}
EXPORT_SYMBOL(fman_get_pause_cfg);

#define DTSEC_SUPPORTED \
	(SUPPORTED_10baseT_Half \
	| SUPPORTED_10baseT_Full \
	| SUPPORTED_100baseT_Half \
	| SUPPORTED_100baseT_Full \
	| SUPPORTED_Autoneg \
	| SUPPORTED_Pause \
	| SUPPORTED_Asym_Pause \
	| SUPPORTED_FIBRE \
	| SUPPORTED_MII)

static DEFINE_MUTEX(eth_lock);

static const u16 phy2speed[] = {
	[PHY_INTERFACE_MODE_MII]		= SPEED_100,
	[PHY_INTERFACE_MODE_GMII]		= SPEED_1000,
	[PHY_INTERFACE_MODE_SGMII]		= SPEED_1000,
	[PHY_INTERFACE_MODE_TBI]		= SPEED_1000,
	[PHY_INTERFACE_MODE_RMII]		= SPEED_100,
	[PHY_INTERFACE_MODE_RGMII]		= SPEED_1000,
	[PHY_INTERFACE_MODE_RGMII_ID]		= SPEED_1000,
	[PHY_INTERFACE_MODE_RGMII_RXID]	= SPEED_1000,
	[PHY_INTERFACE_MODE_RGMII_TXID]	= SPEED_1000,
	[PHY_INTERFACE_MODE_RTBI]		= SPEED_1000,
	[PHY_INTERFACE_MODE_QSGMII]		= SPEED_1000,
	[PHY_INTERFACE_MODE_XGMII]		= SPEED_10000
};

static struct platform_device *dpaa_eth_add_device(int fman_id,
						   struct mac_device *mac_dev)
{
	struct platform_device *pdev;
	struct dpaa_eth_data data;
	struct mac_priv_s	*priv;
	static int dpaa_eth_dev_cnt;
	int ret;

	priv = mac_dev->priv;

	data.mac_dev = mac_dev;
	data.mac_hw_id = priv->cell_index;
	data.fman_hw_id = fman_id;

	mutex_lock(&eth_lock);
	pdev = platform_device_alloc("dpaa-ethernet", dpaa_eth_dev_cnt);
	if (!pdev) {
		ret = -ENOMEM;
		goto no_mem;
	}

	pdev->dev.parent = mac_dev->dev;

	ret = platform_device_add_data(pdev, &data, sizeof(data));
	if (ret)
		goto err;

	ret = platform_device_add(pdev);
	if (ret)
		goto err;

	dpaa_eth_dev_cnt++;
	mutex_unlock(&eth_lock);

	return pdev;

err:
	platform_device_put(pdev);
no_mem:
	mutex_unlock(&eth_lock);

	return ERR_PTR(ret);
}

static const struct of_device_id mac_match[] = {
	{ .compatible	= "fsl,fman-dtsec", .data = dtsec_initialization },
	{ .compatible	= "fsl,fman-xgec", .data = tgec_initialization },
	{ .compatible	= "fsl,fman-memac", .data = memac_initialization },
	{}
};
MODULE_DEVICE_TABLE(of, mac_match);

static int mac_probe(struct platform_device *_of_dev)
{
	int			 err, i, nph;
	int (*init)(struct mac_device *mac_dev, struct device_node *mac_node,
		    struct fman_mac_params *params);
	struct device		*dev;
	struct device_node	*mac_node, *dev_node;
	struct mac_device	*mac_dev;
	struct platform_device	*of_dev;
	struct resource		*res;
	struct mac_priv_s	*priv;
	struct fman_mac_params	 params;
	u32			 val;
	u8			fman_id;
	phy_interface_t          phy_if;

	dev = &_of_dev->dev;
	mac_node = dev->of_node;
	init = of_device_get_match_data(dev);

	mac_dev = devm_kzalloc(dev, sizeof(*mac_dev), GFP_KERNEL);
	if (!mac_dev)
		return -ENOMEM;
	priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
	if (!priv)
		return -ENOMEM;

	/* Save private information */
	mac_dev->priv = priv;
	mac_dev->dev = dev;

	INIT_LIST_HEAD(&priv->mc_addr_list);

	/* Get the FM node */
	dev_node = of_get_parent(mac_node);
	if (!dev_node) {
		dev_err(dev, "of_get_parent(%pOF) failed\n",
			mac_node);
		return -EINVAL;
	}

	of_dev = of_find_device_by_node(dev_node);
	if (!of_dev) {
		dev_err(dev, "of_find_device_by_node(%pOF) failed\n", dev_node);
		err = -EINVAL;
		goto _return_of_node_put;
	}

	/* Get the FMan cell-index */
	err = of_property_read_u32(dev_node, "cell-index", &val);
	if (err) {
		dev_err(dev, "failed to read cell-index for %pOF\n", dev_node);
		err = -EINVAL;
		goto _return_of_node_put;
	}
	/* cell-index 0 => FMan id 1 */
	fman_id = (u8)(val + 1);

	priv->fman = fman_bind(&of_dev->dev);
	if (!priv->fman) {
		dev_err(dev, "fman_bind(%pOF) failed\n", dev_node);
		err = -ENODEV;
		goto _return_of_node_put;
	}

	of_node_put(dev_node);

	/* Get the address of the memory mapped registers */
	res = platform_get_mem_or_io(_of_dev, 0);
	if (!res) {
		dev_err(dev, "could not get registers\n");
		return -EINVAL;
	}

	err = devm_request_resource(dev, fman_get_mem_region(priv->fman), res);
	if (err) {
		dev_err_probe(dev, err, "could not request resource\n");
		return err;
	}

	mac_dev->vaddr = devm_ioremap(dev, res->start, resource_size(res));
	if (!mac_dev->vaddr) {
		dev_err(dev, "devm_ioremap() failed\n");
		return -EIO;
	}
	mac_dev->vaddr_end = mac_dev->vaddr + resource_size(res);

	if (!of_device_is_available(mac_node))
		return -ENODEV;

	/* Get the cell-index */
	err = of_property_read_u32(mac_node, "cell-index", &val);
	if (err) {
		dev_err(dev, "failed to read cell-index for %pOF\n", mac_node);
		return -EINVAL;
	}
	priv->cell_index = (u8)val;

	/* Get the MAC address */
	err = of_get_mac_address(mac_node, mac_dev->addr);
	if (err)
		dev_warn(dev, "of_get_mac_address(%pOF) failed\n", mac_node);

	/* Get the port handles */
	nph = of_count_phandle_with_args(mac_node, "fsl,fman-ports", NULL);
	if (unlikely(nph < 0)) {
		dev_err(dev, "of_count_phandle_with_args(%pOF, fsl,fman-ports) failed\n",
			mac_node);
		return nph;
	}

	if (nph != ARRAY_SIZE(mac_dev->port)) {
		dev_err(dev, "Not supported number of fman-ports handles of mac node %pOF from device tree\n",
			mac_node);
		return -EINVAL;
	}

	for (i = 0; i < ARRAY_SIZE(mac_dev->port); i++) {
		/* Find the port node */
		dev_node = of_parse_phandle(mac_node, "fsl,fman-ports", i);
		if (!dev_node) {
			dev_err(dev, "of_parse_phandle(%pOF, fsl,fman-ports) failed\n",
				mac_node);
			return -EINVAL;
		}

		of_dev = of_find_device_by_node(dev_node);
		if (!of_dev) {
			dev_err(dev, "of_find_device_by_node(%pOF) failed\n",
				dev_node);
			err = -EINVAL;
			goto _return_of_node_put;
		}

		mac_dev->port[i] = fman_port_bind(&of_dev->dev);
		if (!mac_dev->port[i]) {
			dev_err(dev, "dev_get_drvdata(%pOF) failed\n",
				dev_node);
			err = -EINVAL;
			goto _return_of_node_put;
		}
		of_node_put(dev_node);
	}

	/* Get the PHY connection type */
	err = of_get_phy_mode(mac_node, &phy_if);
	if (err) {
		dev_warn(dev,
			 "of_get_phy_mode() for %pOF failed. Defaulting to SGMII\n",
			 mac_node);
		phy_if = PHY_INTERFACE_MODE_SGMII;
	}
	mac_dev->phy_if = phy_if;

	priv->speed		= phy2speed[mac_dev->phy_if];
	params.max_speed	= priv->speed;
	mac_dev->if_support	= DTSEC_SUPPORTED;
	/* We don't support half-duplex in SGMII mode */
	if (mac_dev->phy_if == PHY_INTERFACE_MODE_SGMII)
		mac_dev->if_support &= ~(SUPPORTED_10baseT_Half |
					SUPPORTED_100baseT_Half);

	/* Gigabit support (no half-duplex) */
	if (params.max_speed == 1000)
		mac_dev->if_support |= SUPPORTED_1000baseT_Full;

	/* The 10G interface only supports one mode */
	if (mac_dev->phy_if == PHY_INTERFACE_MODE_XGMII)
		mac_dev->if_support = SUPPORTED_10000baseT_Full;

	/* Get the rest of the PHY information */
	mac_dev->phy_node = of_parse_phandle(mac_node, "phy-handle", 0);

	params.basex_if		= false;
	params.mac_id		= priv->cell_index;
	params.fm		= (void *)priv->fman;
	params.exception_cb	= mac_exception;
	params.event_cb		= mac_exception;

	err = init(mac_dev, mac_node, &params);
	if (err < 0) {
		dev_err(dev, "mac_dev->init() = %d\n", err);
		of_node_put(mac_dev->phy_node);
		return err;
	}

	/* pause frame autonegotiation enabled */
	mac_dev->autoneg_pause = true;

	/* By intializing the values to false, force FMD to enable PAUSE frames
	 * on RX and TX
	 */
	mac_dev->rx_pause_req = true;
	mac_dev->tx_pause_req = true;
	mac_dev->rx_pause_active = false;
	mac_dev->tx_pause_active = false;
	err = fman_set_mac_active_pause(mac_dev, true, true);
	if (err < 0)
		dev_err(dev, "fman_set_mac_active_pause() = %d\n", err);

	if (!is_zero_ether_addr(mac_dev->addr))
		dev_info(dev, "FMan MAC address: %pM\n", mac_dev->addr);

	priv->eth_dev = dpaa_eth_add_device(fman_id, mac_dev);
	if (IS_ERR(priv->eth_dev)) {
		dev_err(dev, "failed to add Ethernet platform device for MAC %d\n",
			priv->cell_index);
		priv->eth_dev = NULL;
	}

	return err;

_return_of_node_put:
	of_node_put(dev_node);
	return err;
}

static struct platform_driver mac_driver = {
	.driver = {
		.name		= KBUILD_MODNAME,
		.of_match_table	= mac_match,
	},
	.probe		= mac_probe,
};

builtin_platform_driver(mac_driver);