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1// SPDX-License-Identifier: GPL-2.0-only2/*3 * VFIO platform driver specialized for Calxeda xgmac reset4 * reset code is inherited from calxeda xgmac native driver5 *6 * Copyright 2010-2011 Calxeda, Inc.7 * Copyright (c) 2015 Linaro Ltd.8 * www.linaro.org9 */10 11#include <linux/module.h>12#include <linux/kernel.h>13#include <linux/init.h>14#include <linux/io.h>15 16#include "../vfio_platform_private.h"17 18#define DRIVER_VERSION "0.1"19#define DRIVER_AUTHOR "Eric Auger <eric.auger@linaro.org>"20#define DRIVER_DESC "Reset support for Calxeda xgmac vfio platform device"21 22/* XGMAC Register definitions */23#define XGMAC_CONTROL 0x00000000 /* MAC Configuration */24 25/* DMA Control and Status Registers */26#define XGMAC_DMA_CONTROL 0x00000f18 /* Ctrl (Operational Mode) */27#define XGMAC_DMA_INTR_ENA 0x00000f1c /* Interrupt Enable */28 29/* DMA Control register defines */30#define DMA_CONTROL_ST 0x00002000 /* Start/Stop Transmission */31#define DMA_CONTROL_SR 0x00000002 /* Start/Stop Receive */32 33/* Common MAC defines */34#define MAC_ENABLE_TX 0x00000008 /* Transmitter Enable */35#define MAC_ENABLE_RX 0x00000004 /* Receiver Enable */36 37static inline void xgmac_mac_disable(void __iomem *ioaddr)38{39 u32 value = readl(ioaddr + XGMAC_DMA_CONTROL);40 41 value &= ~(DMA_CONTROL_ST | DMA_CONTROL_SR);42 writel(value, ioaddr + XGMAC_DMA_CONTROL);43 44 value = readl(ioaddr + XGMAC_CONTROL);45 value &= ~(MAC_ENABLE_TX | MAC_ENABLE_RX);46 writel(value, ioaddr + XGMAC_CONTROL);47}48 49static int vfio_platform_calxedaxgmac_reset(struct vfio_platform_device *vdev)50{51 struct vfio_platform_region *reg = &vdev->regions[0];52 53 if (!reg->ioaddr) {54 reg->ioaddr =55 ioremap(reg->addr, reg->size);56 if (!reg->ioaddr)57 return -ENOMEM;58 }59 60 /* disable IRQ */61 writel(0, reg->ioaddr + XGMAC_DMA_INTR_ENA);62 63 /* Disable the MAC core */64 xgmac_mac_disable(reg->ioaddr);65 66 return 0;67}68 69module_vfio_reset_handler("calxeda,hb-xgmac", vfio_platform_calxedaxgmac_reset);70 71MODULE_VERSION(DRIVER_VERSION);72MODULE_LICENSE("GPL v2");73MODULE_AUTHOR(DRIVER_AUTHOR);74MODULE_DESCRIPTION(DRIVER_DESC);75