75 lines
2.1 KiB
C
75 lines
2.1 KiB
C
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// SPDX-License-Identifier: GPL-2.0-only
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/*
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* VFIO platform driver specialized for Calxeda xgmac reset
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* reset code is inherited from calxeda xgmac native driver
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*
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* Copyright 2010-2011 Calxeda, Inc.
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* Copyright (c) 2015 Linaro Ltd.
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* www.linaro.org
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*/
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#include <linux/module.h>
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#include <linux/kernel.h>
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#include <linux/init.h>
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#include <linux/io.h>
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#include "../vfio_platform_private.h"
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#define DRIVER_VERSION "0.1"
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#define DRIVER_AUTHOR "Eric Auger <eric.auger@linaro.org>"
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#define DRIVER_DESC "Reset support for Calxeda xgmac vfio platform device"
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/* XGMAC Register definitions */
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#define XGMAC_CONTROL 0x00000000 /* MAC Configuration */
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/* DMA Control and Status Registers */
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#define XGMAC_DMA_CONTROL 0x00000f18 /* Ctrl (Operational Mode) */
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#define XGMAC_DMA_INTR_ENA 0x00000f1c /* Interrupt Enable */
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/* DMA Control register defines */
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#define DMA_CONTROL_ST 0x00002000 /* Start/Stop Transmission */
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#define DMA_CONTROL_SR 0x00000002 /* Start/Stop Receive */
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/* Common MAC defines */
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#define MAC_ENABLE_TX 0x00000008 /* Transmitter Enable */
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#define MAC_ENABLE_RX 0x00000004 /* Receiver Enable */
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static inline void xgmac_mac_disable(void __iomem *ioaddr)
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{
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u32 value = readl(ioaddr + XGMAC_DMA_CONTROL);
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value &= ~(DMA_CONTROL_ST | DMA_CONTROL_SR);
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writel(value, ioaddr + XGMAC_DMA_CONTROL);
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value = readl(ioaddr + XGMAC_CONTROL);
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value &= ~(MAC_ENABLE_TX | MAC_ENABLE_RX);
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writel(value, ioaddr + XGMAC_CONTROL);
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}
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static int vfio_platform_calxedaxgmac_reset(struct vfio_platform_device *vdev)
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{
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struct vfio_platform_region *reg = &vdev->regions[0];
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if (!reg->ioaddr) {
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reg->ioaddr =
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ioremap(reg->addr, reg->size);
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if (!reg->ioaddr)
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return -ENOMEM;
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}
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/* disable IRQ */
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writel(0, reg->ioaddr + XGMAC_DMA_INTR_ENA);
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/* Disable the MAC core */
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xgmac_mac_disable(reg->ioaddr);
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return 0;
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}
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module_vfio_reset_handler("calxeda,hb-xgmac", vfio_platform_calxedaxgmac_reset);
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MODULE_VERSION(DRIVER_VERSION);
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MODULE_LICENSE("GPL v2");
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MODULE_AUTHOR(DRIVER_AUTHOR);
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MODULE_DESCRIPTION(DRIVER_DESC);
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