/* 10G controller driver for Samsung SoCs
 *
 * Copyright (C) 2013 Samsung Electronics Co., Ltd.
 *              http://www.samsung.com
 *
 * Author: Siva Reddy Kallam <siva.kallam@samsung.com>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 */

#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt

#include <linux/etherdevice.h>
#include <linux/io.h>
#include <linux/module.h>
#include <linux/netdevice.h>
#include <linux/of.h>
#include <linux/of_irq.h>
#include <linux/of_net.h>
#include <linux/phy.h>
#include <linux/platform_device.h>
#include <linux/sxgbe_platform.h>

#include "sxgbe_common.h"
#include "sxgbe_reg.h"

#ifdef CONFIG_OF
static int sxgbe_probe_config_dt(struct platform_device *pdev,
                                 struct sxgbe_plat_data *plat,
                                 const char **mac)
{
        struct device_node *np = pdev->dev.of_node;
        struct sxgbe_dma_cfg *dma_cfg;

        if (!np)
                return -ENODEV;

        *mac = of_get_mac_address(np);
        plat->interface = of_get_phy_mode(np);

        plat->bus_id = of_alias_get_id(np, "ethernet");
        if (plat->bus_id < 0)
                plat->bus_id = 0;

        plat->mdio_bus_data = devm_kzalloc(&pdev->dev,
                                           sizeof(*plat->mdio_bus_data),
                                           GFP_KERNEL);
        if (!plat->mdio_bus_data)
                return -ENOMEM;

        dma_cfg = devm_kzalloc(&pdev->dev, sizeof(*dma_cfg), GFP_KERNEL);
        if (!dma_cfg)
                return -ENOMEM;

        plat->dma_cfg = dma_cfg;
        of_property_read_u32(np, "samsung,pbl", &dma_cfg->pbl);
        if (of_property_read_u32(np, "samsung,burst-map", &dma_cfg->burst_map) == 0)
                dma_cfg->fixed_burst = true;

        return 0;
}
#else
static int sxgbe_probe_config_dt(struct platform_device *pdev,
                                 struct sxgbe_plat_data *plat,
                                 const char **mac)
{
        return -ENOSYS;
}
#endif /* CONFIG_OF */

/**
 * sxgbe_platform_probe
 * @pdev: platform device pointer
 * Description: platform_device probe function. It allocates
 * the necessary resources and invokes the main to init
 * the net device, register the mdio bus etc.
 */
static int sxgbe_platform_probe(struct platform_device *pdev)
{
        int ret;
        int i, chan;
        struct resource *res;
        struct device *dev = &pdev->dev;
        void __iomem *addr;
        struct sxgbe_priv_data *priv = NULL;
        struct sxgbe_plat_data *plat_dat = NULL;
        const char *mac = NULL;
        struct net_device *ndev = platform_get_drvdata(pdev);
        struct device_node *node = dev->of_node;

        /* Get memory resource */
        res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
        addr = devm_ioremap_resource(dev, res);
        if (IS_ERR(addr))
                return PTR_ERR(addr);

        if (pdev->dev.of_node) {
                plat_dat = devm_kzalloc(&pdev->dev,
                                        sizeof(struct sxgbe_plat_data),
                                        GFP_KERNEL);
                if (!plat_dat)
                        return  -ENOMEM;

                ret = sxgbe_probe_config_dt(pdev, plat_dat, &mac);
                if (ret) {
                        pr_err("%s: main dt probe failed\n", __func__);
                        return ret;
                }
        }

        priv = sxgbe_drv_probe(&(pdev->dev), plat_dat, addr);
        if (!priv) {
                pr_err("%s: main driver probe failed\n", __func__);
                goto err_out;
        }

        /* Get the SXGBE common INT information */
        priv->irq  = irq_of_parse_and_map(node, 0);
        if (priv->irq <= 0) {
                dev_err(dev, "sxgbe common irq parsing failed\n");
                goto err_drv_remove;
        }

        /* Get MAC address if available (DT) */
        if (mac)
                ether_addr_copy(priv->dev->dev_addr, mac);

        /* Get the TX/RX IRQ numbers */
        for (i = 0, chan = 1; i < SXGBE_TX_QUEUES; i++) {
                priv->txq[i]->irq_no = irq_of_parse_and_map(node, chan++);
                if (priv->txq[i]->irq_no <= 0) {
                        dev_err(dev, "sxgbe tx irq parsing failed\n");
                        goto err_tx_irq_unmap;
                }
        }

        for (i = 0; i < SXGBE_RX_QUEUES; i++) {
                priv->rxq[i]->irq_no = irq_of_parse_and_map(node, chan++);
                if (priv->rxq[i]->irq_no <= 0) {
                        dev_err(dev, "sxgbe rx irq parsing failed\n");
                        goto err_rx_irq_unmap;
                }
        }

        priv->lpi_irq = irq_of_parse_and_map(node, chan);
        if (priv->lpi_irq <= 0) {
                dev_err(dev, "sxgbe lpi irq parsing failed\n");
                goto err_rx_irq_unmap;
        }

        platform_set_drvdata(pdev, priv->dev);

        pr_debug("platform driver registration completed\n");

        return 0;

err_rx_irq_unmap:
        while (i--)
                irq_dispose_mapping(priv->rxq[i]->irq_no);
        i = SXGBE_TX_QUEUES;
err_tx_irq_unmap:
        while (i--)
                irq_dispose_mapping(priv->txq[i]->irq_no);
        irq_dispose_mapping(priv->irq);
err_drv_remove:
        sxgbe_drv_remove(ndev);
err_out:
        return -ENODEV;
}

/**
 * sxgbe_platform_remove
 * @pdev: platform device pointer
 * Description: this function calls the main to free the net resources
 * and calls the platforms hook and release the resources (e.g. mem).
 */
static int sxgbe_platform_remove(struct platform_device *pdev)
{
        struct net_device *ndev = platform_get_drvdata(pdev);
        int ret = sxgbe_drv_remove(ndev);

        return ret;
}

#ifdef CONFIG_PM
static int sxgbe_platform_suspend(struct device *dev)
{
        struct net_device *ndev = dev_get_drvdata(dev);

        return sxgbe_suspend(ndev);
}

static int sxgbe_platform_resume(struct device *dev)
{
        struct net_device *ndev = dev_get_drvdata(dev);

        return sxgbe_resume(ndev);
}

static int sxgbe_platform_freeze(struct device *dev)
{
        struct net_device *ndev = dev_get_drvdata(dev);

        return sxgbe_freeze(ndev);
}

static int sxgbe_platform_restore(struct device *dev)
{
        struct net_device *ndev = dev_get_drvdata(dev);

        return sxgbe_restore(ndev);
}

static const struct dev_pm_ops sxgbe_platform_pm_ops = {
        .suspend        = sxgbe_platform_suspend,
        .resume         = sxgbe_platform_resume,
        .freeze         = sxgbe_platform_freeze,
        .thaw           = sxgbe_platform_restore,
        .restore        = sxgbe_platform_restore,
};
#else
static const struct dev_pm_ops sxgbe_platform_pm_ops;
#endif /* CONFIG_PM */

static const struct of_device_id sxgbe_dt_ids[] = {
        { .compatible = "samsung,sxgbe-v2.0a"},
        { /* sentinel */ }
};
MODULE_DEVICE_TABLE(of, sxgbe_dt_ids);

static struct platform_driver sxgbe_platform_driver = {
        .probe  = sxgbe_platform_probe,
        .remove = sxgbe_platform_remove,
        .driver = {
                .name           = SXGBE_RESOURCE_NAME,
                .pm             = &sxgbe_platform_pm_ops,
                .of_match_table = of_match_ptr(sxgbe_dt_ids),
        },
};

int sxgbe_register_platform(void)
{
        int err;

        err = platform_driver_register(&sxgbe_platform_driver);
        if (err)
                pr_err("failed to register the platform driver\n");

        return err;
}

void sxgbe_unregister_platform(void)
{
        platform_driver_unregister(&sxgbe_platform_driver);
}