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74 lines
2.1 KiB
74 lines
2.1 KiB
// 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 <[email protected]>" |
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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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