/*
 * Copyright (C) 2016 Broadcom
 *
 * 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 version 2.
 *
 * This program is distributed "as is" WITHOUT ANY WARRANTY of any
 * kind, whether express or implied; without even the implied warranty
 * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 */

#define pr_fmt(fmt)		KBUILD_MODNAME ": " fmt

#include <linux/bcma/bcma.h>
#include <linux/etherdevice.h>
#include <linux/of_address.h>
#include <linux/of_net.h>
#include "bgmac.h"

static u32 platform_bgmac_read(struct bgmac *bgmac, u16 offset)
{
	return readl(bgmac->plat.base + offset);
}

static void platform_bgmac_write(struct bgmac *bgmac, u16 offset, u32 value)
{
	writel(value, bgmac->plat.base + offset);
}

static u32 platform_bgmac_idm_read(struct bgmac *bgmac, u16 offset)
{
	return readl(bgmac->plat.idm_base + offset);
}

static void platform_bgmac_idm_write(struct bgmac *bgmac, u16 offset, u32 value)
{
	return writel(value, bgmac->plat.idm_base + offset);
}

static bool platform_bgmac_clk_enabled(struct bgmac *bgmac)
{
	if ((bgmac_idm_read(bgmac, BCMA_IOCTL) &
	     (BCMA_IOCTL_CLK | BCMA_IOCTL_FGC)) != BCMA_IOCTL_CLK)
		return false;
	if (bgmac_idm_read(bgmac, BCMA_RESET_CTL) & BCMA_RESET_CTL_RESET)
		return false;
	return true;
}

static void platform_bgmac_clk_enable(struct bgmac *bgmac, u32 flags)
{
	bgmac_idm_write(bgmac, BCMA_IOCTL,
			(BCMA_IOCTL_CLK | BCMA_IOCTL_FGC | flags));
	bgmac_idm_read(bgmac, BCMA_IOCTL);

	bgmac_idm_write(bgmac, BCMA_RESET_CTL, 0);
	bgmac_idm_read(bgmac, BCMA_RESET_CTL);
	udelay(1);

	bgmac_idm_write(bgmac, BCMA_IOCTL, (BCMA_IOCTL_CLK | flags));
	bgmac_idm_read(bgmac, BCMA_IOCTL);
	udelay(1);
}

static void platform_bgmac_cco_ctl_maskset(struct bgmac *bgmac, u32 offset,
					   u32 mask, u32 set)
{
	/* This shouldn't be encountered */
	WARN_ON(1);
}

static u32 platform_bgmac_get_bus_clock(struct bgmac *bgmac)
{
	/* This shouldn't be encountered */
	WARN_ON(1);

	return 0;
}

static void platform_bgmac_cmn_maskset32(struct bgmac *bgmac, u16 offset,
					 u32 mask, u32 set)
{
	/* This shouldn't be encountered */
	WARN_ON(1);
}

static int bgmac_probe(struct platform_device *pdev)
{
	struct device_node *np = pdev->dev.of_node;
	struct bgmac *bgmac;
	struct resource *regs;
	const u8 *mac_addr;

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

	platform_set_drvdata(pdev, bgmac);

	/* Set the features of the 4707 family */
	bgmac->feature_flags |= BGMAC_FEAT_CLKCTLST;
	bgmac->feature_flags |= BGMAC_FEAT_NO_RESET;
	bgmac->feature_flags |= BGMAC_FEAT_FORCE_SPEED_2500;
	bgmac->feature_flags |= BGMAC_FEAT_CMDCFG_SR_REV4;
	bgmac->feature_flags |= BGMAC_FEAT_TX_MASK_SETUP;
	bgmac->feature_flags |= BGMAC_FEAT_RX_MASK_SETUP;

	bgmac->dev = &pdev->dev;
	bgmac->dma_dev = &pdev->dev;

	mac_addr = of_get_mac_address(np);
	if (mac_addr)
		ether_addr_copy(bgmac->mac_addr, mac_addr);
	else
		dev_warn(&pdev->dev, "MAC address not present in device tree\n");

	bgmac->irq = platform_get_irq(pdev, 0);
	if (bgmac->irq < 0) {
		dev_err(&pdev->dev, "Unable to obtain IRQ\n");
		return bgmac->irq;
	}

	regs = platform_get_resource_byname(pdev, IORESOURCE_MEM, "amac_base");
	if (!regs) {
		dev_err(&pdev->dev, "Unable to obtain base resource\n");
		return -EINVAL;
	}

	bgmac->plat.base = devm_ioremap_resource(&pdev->dev, regs);
	if (IS_ERR(bgmac->plat.base))
		return PTR_ERR(bgmac->plat.base);

	regs = platform_get_resource_byname(pdev, IORESOURCE_MEM, "idm_base");
	if (!regs) {
		dev_err(&pdev->dev, "Unable to obtain idm resource\n");
		return -EINVAL;
	}

	bgmac->plat.idm_base = devm_ioremap_resource(&pdev->dev, regs);
	if (IS_ERR(bgmac->plat.idm_base))
		return PTR_ERR(bgmac->plat.idm_base);

	bgmac->read = platform_bgmac_read;
	bgmac->write = platform_bgmac_write;
	bgmac->idm_read = platform_bgmac_idm_read;
	bgmac->idm_write = platform_bgmac_idm_write;
	bgmac->clk_enabled = platform_bgmac_clk_enabled;
	bgmac->clk_enable = platform_bgmac_clk_enable;
	bgmac->cco_ctl_maskset = platform_bgmac_cco_ctl_maskset;
	bgmac->get_bus_clock = platform_bgmac_get_bus_clock;
	bgmac->cmn_maskset32 = platform_bgmac_cmn_maskset32;

	return bgmac_enet_probe(bgmac);
}

static int bgmac_remove(struct platform_device *pdev)
{
	struct bgmac *bgmac = platform_get_drvdata(pdev);

	bgmac_enet_remove(bgmac);

	return 0;
}

static const struct of_device_id bgmac_of_enet_match[] = {
	{.compatible = "brcm,amac",},
	{.compatible = "brcm,nsp-amac",},
	{},
};

MODULE_DEVICE_TABLE(of, bgmac_of_enet_match);

static struct platform_driver bgmac_enet_driver = {
	.driver = {
		.name  = "bgmac-enet",
		.of_match_table = bgmac_of_enet_match,
	},
	.probe = bgmac_probe,
	.remove = bgmac_remove,
};

module_platform_driver(bgmac_enet_driver);
MODULE_LICENSE("GPL");