// SPDX-License-Identifier: GPL-2.0-only
/*
 * VFIO platform driver specialized for Calxeda xgmac reset
 * reset code is inherited from calxeda xgmac native driver
 *
 * Copyright 2010-2011 Calxeda, Inc.
 * Copyright (c) 2015 Linaro Ltd.
 *              www.linaro.org
 */

#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/io.h>

#include "../vfio_platform_private.h"

#define DRIVER_VERSION  "0.1"
#define DRIVER_AUTHOR   "Eric Auger <eric.auger@linaro.org>"
#define DRIVER_DESC     "Reset support for Calxeda xgmac vfio platform device"

/* XGMAC Register definitions */
#define XGMAC_CONTROL           0x00000000      /* MAC Configuration */

/* DMA Control and Status Registers */
#define XGMAC_DMA_CONTROL       0x00000f18      /* Ctrl (Operational Mode) */
#define XGMAC_DMA_INTR_ENA      0x00000f1c      /* Interrupt Enable */

/* DMA Control register defines */
#define DMA_CONTROL_ST          0x00002000      /* Start/Stop Transmission */
#define DMA_CONTROL_SR          0x00000002      /* Start/Stop Receive */

/* Common MAC defines */
#define MAC_ENABLE_TX           0x00000008      /* Transmitter Enable */
#define MAC_ENABLE_RX           0x00000004      /* Receiver Enable */

static inline void xgmac_mac_disable(void __iomem *ioaddr)
{
        u32 value = readl(ioaddr + XGMAC_DMA_CONTROL);

        value &= ~(DMA_CONTROL_ST | DMA_CONTROL_SR);
        writel(value, ioaddr + XGMAC_DMA_CONTROL);

        value = readl(ioaddr + XGMAC_CONTROL);
        value &= ~(MAC_ENABLE_TX | MAC_ENABLE_RX);
        writel(value, ioaddr + XGMAC_CONTROL);
}

static int vfio_platform_calxedaxgmac_reset(struct vfio_platform_device *vdev)
{
        struct vfio_platform_region *reg = &vdev->regions[0];

        dev_err_once(vdev->device, "DEPRECATION: VFIO Calxeda xgmac platform reset is deprecated and will be removed in a future kernel release\n");

        if (!reg->ioaddr) {
                reg->ioaddr =
                        ioremap(reg->addr, reg->size);
                if (!reg->ioaddr)
                        return -ENOMEM;
        }

        /* disable IRQ */
        writel(0, reg->ioaddr + XGMAC_DMA_INTR_ENA);

        /* Disable the MAC core */
        xgmac_mac_disable(reg->ioaddr);

        return 0;
}

module_vfio_reset_handler("calxeda,hb-xgmac", vfio_platform_calxedaxgmac_reset);

MODULE_VERSION(DRIVER_VERSION);
MODULE_LICENSE("GPL v2");
MODULE_AUTHOR(DRIVER_AUTHOR);
MODULE_DESCRIPTION(DRIVER_DESC);