// SPDX-License-Identifier: GPL-2.0-only
/*******************************************************************************
  This contains the functions to handle the platform driver.

  Copyright (C) 2007-2011  STMicroelectronics Ltd


  Author: Giuseppe Cavallaro <peppe.cavallaro@st.com>
*******************************************************************************/

#include <linux/device.h>
#include <linux/platform_device.h>
#include <linux/pm_runtime.h>
#include <linux/module.h>
#include <linux/io.h>
#include <linux/of.h>
#include <linux/of_net.h>
#include <linux/of_mdio.h>

#include "stmmac.h"
#include "stmmac_platform.h"

#ifdef CONFIG_OF

/**
 * dwmac1000_validate_mcast_bins - validates the number of Multicast filter bins
 * @dev: struct device of the platform device
 * @mcast_bins: Multicast filtering bins
 * Description:
 * this function validates the number of Multicast filtering bins specified
 * by the configuration through the device tree. The Synopsys GMAC supports
 * 64 bins, 128 bins, or 256 bins. "bins" refer to the division of CRC
 * number space. 64 bins correspond to 6 bits of the CRC, 128 corresponds
 * to 7 bits, and 256 refers to 8 bits of the CRC. Any other setting is
 * invalid and will cause the filtering algorithm to use Multicast
 * promiscuous mode.
 */
static int dwmac1000_validate_mcast_bins(struct device *dev, int mcast_bins)
{
        int x = mcast_bins;

        switch (x) {
        case HASH_TABLE_SIZE:
        case 128:
        case 256:
                break;
        default:
                x = 0;
                dev_info(dev, "Hash table entries set to unexpected value %d\n",
                         mcast_bins);
                break;
        }
        return x;
}

/**
 * dwmac1000_validate_ucast_entries - validate the Unicast address entries
 * @dev: struct device of the platform device
 * @ucast_entries: number of Unicast address entries
 * Description:
 * This function validates the number of Unicast address entries supported
 * by a particular Synopsys 10/100/1000 controller. The Synopsys controller
 * supports 1..32, 64, or 128 Unicast filter entries for its Unicast filter
 * logic. This function validates a valid, supported configuration is
 * selected, and defaults to 1 Unicast address if an unsupported
 * configuration is selected.
 */
static int dwmac1000_validate_ucast_entries(struct device *dev,
                                            int ucast_entries)
{
        int x = ucast_entries;

        switch (x) {
        case 1 ... 32:
        case 64:
        case 128:
                break;
        default:
                x = 1;
                dev_info(dev, "Unicast table entries set to unexpected value %d\n",
                         ucast_entries);
                break;
        }
        return x;
}

/**
 * stmmac_axi_setup - parse DT parameters for programming the AXI register
 * @pdev: platform device
 * Description:
 * if required, from device-tree the AXI internal register can be tuned
 * by using platform parameters.
 */
static struct stmmac_axi *stmmac_axi_setup(struct platform_device *pdev)
{
        struct device_node *np;
        struct stmmac_axi *axi;
        u32 axi_blen[AXI_BLEN];

        np = of_parse_phandle(pdev->dev.of_node, "snps,axi-config", 0);
        if (!np)
                return NULL;

        axi = devm_kzalloc(&pdev->dev, sizeof(*axi), GFP_KERNEL);
        if (!axi) {
                of_node_put(np);
                return ERR_PTR(-ENOMEM);
        }

        axi->axi_lpi_en = of_property_read_bool(np, "snps,lpi_en");
        axi->axi_xit_frm = of_property_read_bool(np, "snps,xit_frm");
        axi->axi_kbbe = of_property_read_bool(np, "snps,kbbe");
        axi->axi_fb = of_property_read_bool(np, "snps,fb");
        axi->axi_mb = of_property_read_bool(np, "snps,mb");
        axi->axi_rb =  of_property_read_bool(np, "snps,rb");

        if (of_property_read_u32(np, "snps,wr_osr_lmt", &axi->axi_wr_osr_lmt))
                axi->axi_wr_osr_lmt = 1;
        if (of_property_read_u32(np, "snps,rd_osr_lmt", &axi->axi_rd_osr_lmt))
                axi->axi_rd_osr_lmt = 1;
        of_property_read_u32_array(np, "snps,blen", axi_blen, AXI_BLEN);
        stmmac_axi_blen_to_mask(&axi->axi_blen_regval, axi_blen, AXI_BLEN);
        of_node_put(np);

        return axi;
}

/**
 * stmmac_mtl_setup - parse DT parameters for multiple queues configuration
 * @pdev: platform device
 * @plat: enet data
 */
static int stmmac_mtl_setup(struct platform_device *pdev,
                            struct plat_stmmacenet_data *plat)
{
        struct device_node *q_node;
        struct device_node *rx_node;
        struct device_node *tx_node;
        u8 queue = 0;
        int ret = 0;

        /* First Queue must always be in DCB mode. As MTL_QUEUE_DCB = 1 we need
         * to always set this, otherwise Queue will be classified as AVB
         * (because MTL_QUEUE_AVB = 0).
         */
        plat->rx_queues_cfg[0].mode_to_use = MTL_QUEUE_DCB;
        plat->tx_queues_cfg[0].mode_to_use = MTL_QUEUE_DCB;

        rx_node = of_parse_phandle(pdev->dev.of_node, "snps,mtl-rx-config", 0);
        if (!rx_node)
                return ret;

        tx_node = of_parse_phandle(pdev->dev.of_node, "snps,mtl-tx-config", 0);
        if (!tx_node) {
                of_node_put(rx_node);
                return ret;
        }

        /* Processing RX queues common config */
        of_property_read_u32(rx_node, "snps,rx-queues-to-use",
                             &plat->rx_queues_to_use);

        if (of_property_read_bool(rx_node, "snps,rx-sched-sp"))
                plat->rx_sched_algorithm = MTL_RX_ALGORITHM_SP;
        else if (of_property_read_bool(rx_node, "snps,rx-sched-wsp"))
                plat->rx_sched_algorithm = MTL_RX_ALGORITHM_WSP;
        else
                plat->rx_sched_algorithm = MTL_RX_ALGORITHM_SP;

        /* Processing individual RX queue config */
        for_each_child_of_node(rx_node, q_node) {
                if (queue >= plat->rx_queues_to_use)
                        break;

                if (of_property_read_bool(q_node, "snps,dcb-algorithm"))
                        plat->rx_queues_cfg[queue].mode_to_use = MTL_QUEUE_DCB;
                else if (of_property_read_bool(q_node, "snps,avb-algorithm"))
                        plat->rx_queues_cfg[queue].mode_to_use = MTL_QUEUE_AVB;
                else
                        plat->rx_queues_cfg[queue].mode_to_use = MTL_QUEUE_DCB;

                of_property_read_u32(q_node, "snps,map-to-dma-channel",
                                     &plat->rx_queues_cfg[queue].chan);
                /* TODO: Dynamic mapping to be included in the future */

                if (!of_property_read_u32(q_node, "snps,priority",
                                          &plat->rx_queues_cfg[queue].prio))
                        plat->rx_queues_cfg[queue].use_prio = true;

                /* RX queue specific packet type routing */
                if (of_property_read_bool(q_node, "snps,route-avcp"))
                        plat->rx_queues_cfg[queue].pkt_route = PACKET_AVCPQ;
                else if (of_property_read_bool(q_node, "snps,route-ptp"))
                        plat->rx_queues_cfg[queue].pkt_route = PACKET_PTPQ;
                else if (of_property_read_bool(q_node, "snps,route-dcbcp"))
                        plat->rx_queues_cfg[queue].pkt_route = PACKET_DCBCPQ;
                else if (of_property_read_bool(q_node, "snps,route-up"))
                        plat->rx_queues_cfg[queue].pkt_route = PACKET_UPQ;
                else if (of_property_read_bool(q_node, "snps,route-multi-broad"))
                        plat->rx_queues_cfg[queue].pkt_route = PACKET_MCBCQ;

                queue++;
        }
        if (queue != plat->rx_queues_to_use) {
                ret = -EINVAL;
                dev_err(&pdev->dev, "Not all RX queues were configured\n");
                goto out;
        }

        /* Processing TX queues common config */
        of_property_read_u32(tx_node, "snps,tx-queues-to-use",
                             &plat->tx_queues_to_use);

        if (of_property_read_bool(tx_node, "snps,tx-sched-wrr"))
                plat->tx_sched_algorithm = MTL_TX_ALGORITHM_WRR;
        else if (of_property_read_bool(tx_node, "snps,tx-sched-wfq"))
                plat->tx_sched_algorithm = MTL_TX_ALGORITHM_WFQ;
        else if (of_property_read_bool(tx_node, "snps,tx-sched-dwrr"))
                plat->tx_sched_algorithm = MTL_TX_ALGORITHM_DWRR;
        else
                plat->tx_sched_algorithm = MTL_TX_ALGORITHM_SP;

        queue = 0;

        /* Processing individual TX queue config */
        for_each_child_of_node(tx_node, q_node) {
                if (queue >= plat->tx_queues_to_use)
                        break;

                if (of_property_read_u32(q_node, "snps,weight",
                                         &plat->tx_queues_cfg[queue].weight))
                        plat->tx_queues_cfg[queue].weight = 0x10 + queue;

                if (of_property_read_bool(q_node, "snps,dcb-algorithm")) {
                        plat->tx_queues_cfg[queue].mode_to_use = MTL_QUEUE_DCB;
                } else if (of_property_read_bool(q_node,
                                                 "snps,avb-algorithm")) {
                        plat->tx_queues_cfg[queue].mode_to_use = MTL_QUEUE_AVB;

                        /* Credit Base Shaper parameters used by AVB */
                        if (of_property_read_u32(q_node, "snps,send_slope",
                                &plat->tx_queues_cfg[queue].send_slope))
                                plat->tx_queues_cfg[queue].send_slope = 0x0;
                        if (of_property_read_u32(q_node, "snps,idle_slope",
                                &plat->tx_queues_cfg[queue].idle_slope))
                                plat->tx_queues_cfg[queue].idle_slope = 0x0;
                        if (of_property_read_u32(q_node, "snps,high_credit",
                                &plat->tx_queues_cfg[queue].high_credit))
                                plat->tx_queues_cfg[queue].high_credit = 0x0;
                        if (of_property_read_u32(q_node, "snps,low_credit",
                                &plat->tx_queues_cfg[queue].low_credit))
                                plat->tx_queues_cfg[queue].low_credit = 0x0;
                } else {
                        plat->tx_queues_cfg[queue].mode_to_use = MTL_QUEUE_DCB;
                }

                if (!of_property_read_u32(q_node, "snps,priority",
                                          &plat->tx_queues_cfg[queue].prio))
                        plat->tx_queues_cfg[queue].use_prio = true;

                plat->tx_queues_cfg[queue].coe_unsupported =
                        of_property_read_bool(q_node, "snps,coe-unsupported");

                queue++;
        }
        if (queue != plat->tx_queues_to_use) {
                ret = -EINVAL;
                dev_err(&pdev->dev, "Not all TX queues were configured\n");
                goto out;
        }

out:
        of_node_put(rx_node);
        of_node_put(tx_node);
        of_node_put(q_node);

        return ret;
}

/**
 * stmmac_of_get_mdio() - Gets the MDIO bus from the devicetree.
 * @np: devicetree node
 *
 * The MDIO bus will be searched for in the following ways:
 * 1. The compatible is "snps,dwc-qos-ethernet-4.10" && a "mdio" named
 *    child node exists
 * 2. A child node with the "snps,dwmac-mdio" compatible is present
 *
 * Return: The MDIO node if present otherwise NULL
 */
static struct device_node *stmmac_of_get_mdio(struct device_node *np)
{
        static const struct of_device_id need_mdio_ids[] = {
                { .compatible = "snps,dwc-qos-ethernet-4.10" },
                {},
        };
        struct device_node *mdio_node = NULL;

        if (of_match_node(need_mdio_ids, np)) {
                mdio_node = of_get_child_by_name(np, "mdio");
        } else {
                /**
                 * If snps,dwmac-mdio is passed from DT, always register
                 * the MDIO
                 */
                for_each_child_of_node(np, mdio_node) {
                        if (of_device_is_compatible(mdio_node,
                                                    "snps,dwmac-mdio"))
                                break;
                }
        }

        return mdio_node;
}

/**
 * stmmac_mdio_setup() - Populate platform related MDIO structures.
 * @plat: driver data platform structure
 * @np: devicetree node
 * @dev: device pointer
 *
 * This searches for MDIO information from the devicetree.
 * If an MDIO node is found, it's assigned to plat->mdio_node and
 * plat->mdio_bus_data is allocated.
 * If no connection can be determined, just plat->mdio_bus_data is allocated
 * to indicate a bus should be created and scanned for a phy.
 * If it's determined there's no MDIO bus needed, both are left NULL.
 *
 * This expects that plat->phy_node has already been searched for.
 *
 * Return: 0 on success, errno otherwise.
 */
static int stmmac_mdio_setup(struct plat_stmmacenet_data *plat,
                             struct device_node *np, struct device *dev)
{
        bool legacy_mdio;

        plat->mdio_node = stmmac_of_get_mdio(np);
        if (plat->mdio_node)
                dev_dbg(dev, "Found MDIO subnode\n");

        /* Legacy devicetrees allowed for no MDIO bus description and expect
         * the bus to be scanned for devices. If there's no phy or fixed-link
         * described assume this is the case since there must be something
         * connected to the MAC.
         */
        legacy_mdio = !of_phy_is_fixed_link(np) && !plat->phy_node;
        if (legacy_mdio)
                dev_info(dev, "Deprecated MDIO bus assumption used\n");

        if (plat->mdio_node || legacy_mdio) {
                plat->mdio_bus_data = devm_kzalloc(dev,
                                                   sizeof(*plat->mdio_bus_data),
                                                   GFP_KERNEL);
                if (!plat->mdio_bus_data)
                        return -ENOMEM;

                plat->mdio_bus_data->needs_reset = true;
        }

        return 0;
}

/**
 * stmmac_of_get_mac_mode - retrieves the interface of the MAC
 * @np: - device-tree node
 * Description:
 * Similar to `of_get_phy_mode()`, this function will retrieve (from
 * the device-tree) the interface mode on the MAC side. This assumes
 * that there is mode converter in-between the MAC & PHY
 * (e.g. GMII-to-RGMII).
 */
static int stmmac_of_get_mac_mode(struct device_node *np)
{
        const char *pm;
        int err, i;

        err = of_property_read_string(np, "mac-mode", &pm);
        if (err < 0)
                return err;

        for (i = 0; i < PHY_INTERFACE_MODE_MAX; i++) {
                if (!strcasecmp(pm, phy_modes(i)))
                        return i;
        }

        return -ENODEV;
}

/* Compatible string array for all gmac4 devices */
static const char * const stmmac_gmac4_compats[] = {
        "snps,dwmac-4.00",
        "snps,dwmac-4.10a",
        "snps,dwmac-4.20a",
        "snps,dwmac-5.00a",
        "snps,dwmac-5.10a",
        "snps,dwmac-5.20",
        "snps,dwmac-5.30a",
        NULL
};

/**
 * stmmac_probe_config_dt - parse device-tree driver parameters
 * @pdev: platform_device structure
 * @mac: MAC address to use
 * Description:
 * this function is to read the driver parameters from device-tree and
 * set some private fields that will be used by the main at runtime.
 */
static struct plat_stmmacenet_data *
stmmac_probe_config_dt(struct platform_device *pdev, u8 *mac)
{
        struct device_node *np = pdev->dev.of_node;
        struct plat_stmmacenet_data *plat;
        struct stmmac_dma_cfg *dma_cfg;
        static int bus_id = -ENODEV;
        int phy_mode;
        void *ret;
        int rc;

        plat = stmmac_plat_dat_alloc(&pdev->dev);
        if (!plat)
                return ERR_PTR(-ENOMEM);

        rc = of_get_mac_address(np, mac);
        if (rc) {
                if (rc == -EPROBE_DEFER)
                        return ERR_PTR(rc);

                eth_zero_addr(mac);
        }

        phy_mode = device_get_phy_mode(&pdev->dev);
        if (phy_mode < 0)
                return ERR_PTR(phy_mode);

        plat->phy_interface = phy_mode;

        rc = stmmac_of_get_mac_mode(np);
        if (rc >= 0 && rc != phy_mode)
                dev_warn(&pdev->dev,
                         "\"mac-mode\" property used for %s but differs to \"phy-mode\" of %s, and will be ignored. Please report.\n",
                         phy_modes(rc), phy_modes(phy_mode));

        /* Some wrapper drivers still rely on phy_node. Let's save it while
         * they are not converted to phylink. */
        plat->phy_node = of_parse_phandle(np, "phy-handle", 0);

        /* PHYLINK automatically parses the phy-handle property */
        plat->port_node = of_fwnode_handle(np);

        /* Get max speed of operation from device tree */
        of_property_read_u32(np, "max-speed", &plat->max_speed);

        plat->bus_id = of_alias_get_id(np, "ethernet");
        if (plat->bus_id < 0) {
                if (bus_id < 0)
                        bus_id = of_alias_get_highest_id("ethernet");
                /* No ethernet alias found, init at -1 so first bus_id is 0 */
                if (bus_id < 0)
                        bus_id = -1;
                plat->bus_id = ++bus_id;
        }

        if (of_property_read_u32(np, "snps,clk-csr", &plat->clk_csr))
                of_property_read_u32(np, "clk_csr", &plat->clk_csr);

        /* "snps,phy-addr" is not a standard property. Mark it as deprecated
         * and warn of its use. Remove this when phy node support is added.
         */
        if (of_property_read_u32(np, "snps,phy-addr", &plat->phy_addr) == 0)
                dev_warn(&pdev->dev, "snps,phy-addr property is deprecated\n");

        rc = stmmac_mdio_setup(plat, np, &pdev->dev);
        if (rc) {
                ret = ERR_PTR(rc);
                goto error_put_phy;
        }

        of_property_read_u32(np, "tx-fifo-depth", &plat->tx_fifo_size);

        of_property_read_u32(np, "rx-fifo-depth", &plat->rx_fifo_size);

        plat->force_sf_dma_mode =
                of_property_read_bool(np, "snps,force_sf_dma_mode");

        if (of_property_read_bool(np, "snps,en-tx-lpi-clockgating")) {
                dev_warn(&pdev->dev,
                         "OF property snps,en-tx-lpi-clockgating is deprecated, please convert driver to use STMMAC_FLAG_EN_TX_LPI_CLK_PHY_CAP\n");
                plat->flags |= STMMAC_FLAG_EN_TX_LPI_CLOCKGATING;
        }

        /*
         * Currently only the properties needed on SPEAr600
         * are provided. All other properties should be added
         * once needed on other platforms.
         */
        if (of_device_is_compatible(np, "st,spear600-gmac") ||
                of_device_is_compatible(np, "snps,dwmac-3.50a") ||
                of_device_is_compatible(np, "snps,dwmac-3.70a") ||
                of_device_is_compatible(np, "snps,dwmac-3.72a") ||
                of_device_is_compatible(np, "snps,dwmac")) {
                /* Note that the max-frame-size parameter as defined in the
                 * ePAPR v1.1 spec is defined as max-frame-size, it's
                 * actually used as the IEEE definition of MAC Client
                 * data, or MTU. The ePAPR specification is confusing as
                 * the definition is max-frame-size, but usage examples
                 * are clearly MTUs
                 */
                of_property_read_u32(np, "max-frame-size", &plat->maxmtu);
                of_property_read_u32(np, "snps,multicast-filter-bins",
                                     &plat->multicast_filter_bins);
                of_property_read_u32(np, "snps,perfect-filter-entries",
                                     &plat->unicast_filter_entries);
                plat->unicast_filter_entries = dwmac1000_validate_ucast_entries(
                                &pdev->dev, plat->unicast_filter_entries);
                plat->multicast_filter_bins = dwmac1000_validate_mcast_bins(
                                &pdev->dev, plat->multicast_filter_bins);
                plat->core_type = DWMAC_CORE_GMAC;
                plat->pmt = 1;
        }

        if (of_device_is_compatible(np, "snps,dwmac-3.40a")) {
                plat->core_type = DWMAC_CORE_GMAC;
                plat->enh_desc = 1;
                plat->tx_coe = 1;
                plat->bugged_jumbo = 1;
                plat->pmt = 1;
        }

        if (of_device_compatible_match(np, stmmac_gmac4_compats)) {
                plat->core_type = DWMAC_CORE_GMAC4;
                plat->pmt = 1;
                if (of_property_read_bool(np, "snps,tso"))
                        plat->flags |= STMMAC_FLAG_TSO_EN;
        }

        if (of_device_is_compatible(np, "snps,dwmac-3.610") ||
                of_device_is_compatible(np, "snps,dwmac-3.710")) {
                plat->enh_desc = 1;
                plat->bugged_jumbo = 1;
                plat->force_sf_dma_mode = 1;
        }

        if (of_device_is_compatible(np, "snps,dwxgmac")) {
                plat->core_type = DWMAC_CORE_XGMAC;
                plat->pmt = 1;
                if (of_property_read_bool(np, "snps,tso"))
                        plat->flags |= STMMAC_FLAG_TSO_EN;
                of_property_read_u32(np, "snps,multicast-filter-bins",
                                     &plat->multicast_filter_bins);
        }

        dma_cfg = devm_kzalloc(&pdev->dev, sizeof(*dma_cfg),
                               GFP_KERNEL);
        if (!dma_cfg) {
                ret = ERR_PTR(-ENOMEM);
                goto error_put_mdio;
        }
        plat->dma_cfg = dma_cfg;

        of_property_read_u32(np, "snps,pbl", &dma_cfg->pbl);
        if (!dma_cfg->pbl)
                dma_cfg->pbl = DEFAULT_DMA_PBL;
        of_property_read_u32(np, "snps,txpbl", &dma_cfg->txpbl);
        of_property_read_u32(np, "snps,rxpbl", &dma_cfg->rxpbl);
        dma_cfg->pblx8 = !of_property_read_bool(np, "snps,no-pbl-x8");

        dma_cfg->aal = of_property_read_bool(np, "snps,aal");
        dma_cfg->fixed_burst = of_property_read_bool(np, "snps,fixed-burst");
        dma_cfg->mixed_burst = of_property_read_bool(np, "snps,mixed-burst");

        plat->force_thresh_dma_mode = of_property_read_bool(np, "snps,force_thresh_dma_mode");
        if (plat->force_thresh_dma_mode && plat->force_sf_dma_mode) {
                plat->force_sf_dma_mode = 0;
                dev_warn(&pdev->dev,
                         "force_sf_dma_mode is ignored if force_thresh_dma_mode is set.\n");
        }

        of_property_read_u32(np, "snps,ps-speed", &plat->mac_port_sel_speed);

        plat->axi = stmmac_axi_setup(pdev);

        rc = stmmac_mtl_setup(pdev, plat);
        if (rc) {
                ret = ERR_PTR(rc);
                goto error_put_mdio;
        }

        /* clock setup */
        if (!of_device_is_compatible(np, "snps,dwc-qos-ethernet-4.10")) {
                plat->stmmac_clk = devm_clk_get(&pdev->dev,
                                                STMMAC_RESOURCE_NAME);
                if (IS_ERR(plat->stmmac_clk)) {
                        dev_warn(&pdev->dev, "Cannot get CSR clock\n");
                        plat->stmmac_clk = NULL;
                }
                clk_prepare_enable(plat->stmmac_clk);
        }

        plat->pclk = devm_clk_get_optional(&pdev->dev, "pclk");
        if (IS_ERR(plat->pclk)) {
                ret = plat->pclk;
                goto error_pclk_get;
        }
        clk_prepare_enable(plat->pclk);

        /* Fall-back to main clock in case of no PTP ref is passed */
        plat->clk_ptp_ref = devm_clk_get(&pdev->dev, "ptp_ref");
        if (IS_ERR(plat->clk_ptp_ref)) {
                plat->clk_ptp_rate = clk_get_rate(plat->stmmac_clk);
                plat->clk_ptp_ref = NULL;
                dev_info(&pdev->dev, "PTP uses main clock\n");
        } else {
                plat->clk_ptp_rate = clk_get_rate(plat->clk_ptp_ref);
                dev_dbg(&pdev->dev, "PTP rate %lu\n", plat->clk_ptp_rate);
        }

        plat->stmmac_rst = devm_reset_control_get_optional(&pdev->dev,
                                                           STMMAC_RESOURCE_NAME);
        if (IS_ERR(plat->stmmac_rst)) {
                ret = plat->stmmac_rst;
                goto error_hw_init;
        }

        plat->stmmac_ahb_rst = devm_reset_control_get_optional_shared(
                                                        &pdev->dev, "ahb");
        if (IS_ERR(plat->stmmac_ahb_rst)) {
                ret = plat->stmmac_ahb_rst;
                goto error_hw_init;
        }

        return plat;

error_hw_init:
        clk_disable_unprepare(plat->pclk);
error_pclk_get:
        clk_disable_unprepare(plat->stmmac_clk);
error_put_mdio:
        of_node_put(plat->mdio_node);
error_put_phy:
        of_node_put(plat->phy_node);

        return ret;
}

static void devm_stmmac_remove_config_dt(void *data)
{
        struct plat_stmmacenet_data *plat = data;

        clk_disable_unprepare(plat->stmmac_clk);
        clk_disable_unprepare(plat->pclk);
        of_node_put(plat->mdio_node);
        of_node_put(plat->phy_node);
}

/**
 * devm_stmmac_probe_config_dt
 * @pdev: platform_device structure
 * @mac: MAC address to use
 * Description: Devres variant of stmmac_probe_config_dt().
 */
struct plat_stmmacenet_data *
devm_stmmac_probe_config_dt(struct platform_device *pdev, u8 *mac)
{
        struct plat_stmmacenet_data *plat;
        int ret;

        plat = stmmac_probe_config_dt(pdev, mac);
        if (IS_ERR(plat))
                return plat;

        ret = devm_add_action_or_reset(&pdev->dev,
                                       devm_stmmac_remove_config_dt, plat);
        if (ret)
                return ERR_PTR(ret);

        return plat;
}
#else
struct plat_stmmacenet_data *
devm_stmmac_probe_config_dt(struct platform_device *pdev, u8 *mac)
{
        return ERR_PTR(-EINVAL);
}
#endif /* CONFIG_OF */
EXPORT_SYMBOL_GPL(devm_stmmac_probe_config_dt);

struct clk *stmmac_pltfr_find_clk(struct plat_stmmacenet_data *plat_dat,
                                  const char *name)
{
        for (int i = 0; i < plat_dat->num_clks; i++)
                if (strcmp(plat_dat->clks[i].id, name) == 0)
                        return plat_dat->clks[i].clk;

        return NULL;
}
EXPORT_SYMBOL_GPL(stmmac_pltfr_find_clk);

int stmmac_get_platform_resources(struct platform_device *pdev,
                                  struct stmmac_resources *stmmac_res)
{
        memset(stmmac_res, 0, sizeof(*stmmac_res));

        /* Get IRQ information early to have an ability to ask for deferred
         * probe if needed before we went too far with resource allocation.
         */
        stmmac_res->irq = platform_get_irq_byname(pdev, "macirq");
        if (stmmac_res->irq < 0)
                return stmmac_res->irq;

        /* On some platforms e.g. SPEAr the wake up irq differs from the mac irq
         * The external wake up irq can be passed through the platform code
         * named as "eth_wake_irq"
         *
         * In case the wake up interrupt is not passed from the platform
         * so the driver will continue to use the mac irq (ndev->irq)
         */
        stmmac_res->wol_irq =
                platform_get_irq_byname_optional(pdev, "eth_wake_irq");
        if (stmmac_res->wol_irq < 0) {
                if (stmmac_res->wol_irq == -EPROBE_DEFER)
                        return -EPROBE_DEFER;
                dev_info(&pdev->dev, "IRQ eth_wake_irq not found\n");
                stmmac_res->wol_irq = stmmac_res->irq;
        }

        stmmac_res->sfty_irq =
                platform_get_irq_byname_optional(pdev, "sfty");
        if (stmmac_res->sfty_irq < 0) {
                if (stmmac_res->sfty_irq == -EPROBE_DEFER)
                        return -EPROBE_DEFER;
                dev_info(&pdev->dev, "IRQ sfty not found\n");
        }

        stmmac_res->addr = devm_platform_ioremap_resource(pdev, 0);

        return PTR_ERR_OR_ZERO(stmmac_res->addr);
}
EXPORT_SYMBOL_GPL(stmmac_get_platform_resources);

/**
 * stmmac_pltfr_init
 * @dev: pointer to the device structure
 * @plat: driver data platform structure
 * Description: Call the platform's init callback (if any) and propagate
 * the return value.
 */
static int stmmac_pltfr_init(struct device *dev,
                             struct plat_stmmacenet_data *plat)
{
        int ret = 0;

        if (plat->init)
                ret = plat->init(dev, plat->bsp_priv);

        return ret;
}

/**
 * stmmac_pltfr_exit
 * @dev: pointer to the device structure
 * @plat: driver data platform structure
 * Description: Call the platform's exit callback (if any).
 */
static void stmmac_pltfr_exit(struct device *dev,
                              struct plat_stmmacenet_data *plat)
{
        if (plat->exit)
                plat->exit(dev, plat->bsp_priv);
}

static int stmmac_plat_suspend(struct device *dev, void *bsp_priv)
{
        struct stmmac_priv *priv = netdev_priv(dev_get_drvdata(dev));

        stmmac_pltfr_exit(dev, priv->plat);

        return 0;
}

static int stmmac_plat_resume(struct device *dev, void *bsp_priv)
{
        struct stmmac_priv *priv = netdev_priv(dev_get_drvdata(dev));

        return stmmac_pltfr_init(dev, priv->plat);
}

/**
 * stmmac_pltfr_probe
 * @pdev: platform device pointer
 * @plat: driver data platform structure
 * @res: stmmac resources structure
 * Description: This calls the platform's init() callback and probes the
 * stmmac driver.
 */
int stmmac_pltfr_probe(struct platform_device *pdev,
                       struct plat_stmmacenet_data *plat,
                       struct stmmac_resources *res)
{
        if (!plat->suspend && plat->exit)
                plat->suspend = stmmac_plat_suspend;
        if (!plat->resume && plat->init)
                plat->resume = stmmac_plat_resume;

        return stmmac_dvr_probe(&pdev->dev, plat, res);
}
EXPORT_SYMBOL_GPL(stmmac_pltfr_probe);

static void devm_stmmac_pltfr_remove(void *data)
{
        struct platform_device *pdev = data;

        stmmac_pltfr_remove(pdev);
}

/**
 * devm_stmmac_pltfr_probe
 * @pdev: pointer to the platform device
 * @plat: driver data platform structure
 * @res: stmmac resources
 * Description: Devres variant of stmmac_pltfr_probe(). Allows users to skip
 * calling stmmac_pltfr_remove() on driver detach.
 */
int devm_stmmac_pltfr_probe(struct platform_device *pdev,
                            struct plat_stmmacenet_data *plat,
                            struct stmmac_resources *res)
{
        int ret;

        ret = stmmac_pltfr_probe(pdev, plat, res);
        if (ret)
                return ret;

        return devm_add_action_or_reset(&pdev->dev, devm_stmmac_pltfr_remove,
                                        pdev);
}
EXPORT_SYMBOL_GPL(devm_stmmac_pltfr_probe);

/**
 * stmmac_pltfr_remove
 * @pdev: pointer to the platform device
 * Description: This undoes the effects of stmmac_pltfr_probe() by removing the
 * driver and calling the platform's exit() callback.
 */
void stmmac_pltfr_remove(struct platform_device *pdev)
{
        stmmac_dvr_remove(&pdev->dev);
}
EXPORT_SYMBOL_GPL(stmmac_pltfr_remove);

static int stmmac_bus_clks_config(struct stmmac_priv *priv, bool enabled)
{
        struct plat_stmmacenet_data *plat_dat = priv->plat;
        int ret;

        if (enabled) {
                ret = clk_prepare_enable(plat_dat->stmmac_clk);
                if (ret)
                        return ret;
                ret = clk_prepare_enable(plat_dat->pclk);
                if (ret) {
                        clk_disable_unprepare(plat_dat->stmmac_clk);
                        return ret;
                }
                if (plat_dat->clks_config) {
                        ret = plat_dat->clks_config(plat_dat->bsp_priv, enabled);
                        if (ret) {
                                clk_disable_unprepare(plat_dat->stmmac_clk);
                                clk_disable_unprepare(plat_dat->pclk);
                                return ret;
                        }
                }
        } else {
                clk_disable_unprepare(plat_dat->stmmac_clk);
                clk_disable_unprepare(plat_dat->pclk);
                if (plat_dat->clks_config)
                        plat_dat->clks_config(plat_dat->bsp_priv, enabled);
        }

        return 0;
}

static int __maybe_unused stmmac_runtime_suspend(struct device *dev)
{
        struct net_device *ndev = dev_get_drvdata(dev);
        struct stmmac_priv *priv = netdev_priv(ndev);

        stmmac_bus_clks_config(priv, false);

        return 0;
}

static int __maybe_unused stmmac_runtime_resume(struct device *dev)
{
        struct net_device *ndev = dev_get_drvdata(dev);
        struct stmmac_priv *priv = netdev_priv(ndev);

        return stmmac_bus_clks_config(priv, true);
}

static int __maybe_unused stmmac_pltfr_noirq_suspend(struct device *dev)
{
        struct net_device *ndev = dev_get_drvdata(dev);
        struct stmmac_priv *priv = netdev_priv(ndev);
        int ret;

        if (!netif_running(ndev))
                return 0;

        if (!priv->wolopts) {
                /* Disable clock in case of PWM is off */
                clk_disable_unprepare(priv->plat->clk_ptp_ref);

                ret = pm_runtime_force_suspend(dev);
                if (ret)
                        return ret;
        }

        return 0;
}

static int __maybe_unused stmmac_pltfr_noirq_resume(struct device *dev)
{
        struct net_device *ndev = dev_get_drvdata(dev);
        struct stmmac_priv *priv = netdev_priv(ndev);
        int ret;

        if (!netif_running(ndev))
                return 0;

        if (!priv->wolopts) {
                /* enable the clk previously disabled */
                ret = pm_runtime_force_resume(dev);
                if (ret)
                        return ret;

                ret = clk_prepare_enable(priv->plat->clk_ptp_ref);
                if (ret < 0) {
                        netdev_warn(priv->dev,
                                    "failed to enable PTP reference clock: %pe\n",
                                    ERR_PTR(ret));
                        return ret;
                }
        }

        return 0;
}

const struct dev_pm_ops stmmac_pltfr_pm_ops = {
        SET_SYSTEM_SLEEP_PM_OPS(stmmac_suspend, stmmac_resume)
        SET_RUNTIME_PM_OPS(stmmac_runtime_suspend, stmmac_runtime_resume, NULL)
        SET_NOIRQ_SYSTEM_SLEEP_PM_OPS(stmmac_pltfr_noirq_suspend, stmmac_pltfr_noirq_resume)
};
EXPORT_SYMBOL_GPL(stmmac_pltfr_pm_ops);

MODULE_DESCRIPTION("STMMAC 10/100/1000 Ethernet platform support");
MODULE_AUTHOR("Giuseppe Cavallaro <peppe.cavallaro@st.com>");
MODULE_LICENSE("GPL");