[mirror_ubuntu-jammy-kernel.git] / drivers / vfio / platform / reset / vfio_platform_calxedaxgmac.c

// 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 registe 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];

	if (!reg->ioaddr) {
		reg->ioaddr =
			ioremap_nocache(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);
Commit	Line	Data
9952f691	1	// SPDX-License-Identifier: GPL-2.0-only
713cc334 EA	2	/*
	3	* VFIO platform driver specialized for Calxeda xgmac reset
	4	* reset code is inherited from calxeda xgmac native driver
	5	*
	6	* Copyright 2010-2011 Calxeda, Inc.
	7	* Copyright (c) 2015 Linaro Ltd.
	8	* www.linaro.org
713cc334 EA	9	*/
	10
	11	#include <linux/module.h>
	12	#include <linux/kernel.h>
	13	#include <linux/init.h>
	14	#include <linux/io.h>
	15
3c8d7ef8	16	#include "../vfio_platform_private.h"
713cc334 EA	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
713cc334 EA	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 registe 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
	37	static 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
2e062856	49	static int vfio_platform_calxedaxgmac_reset(struct vfio_platform_device *vdev)
713cc334	50	{
daac3bbe	51	struct vfio_platform_region *reg = &vdev->regions[0];
713cc334	52
daac3bbe EA	53	if (!reg->ioaddr) {
	54	reg->ioaddr =
	55	ioremap_nocache(reg->addr, reg->size);
	56	if (!reg->ioaddr)
713cc334 EA	57	return -ENOMEM;
	58	}
	59
	60	/* disable IRQ */
daac3bbe	61	writel(0, reg->ioaddr + XGMAC_DMA_INTR_ENA);
713cc334 EA	62
713cc334 EA	63	/* Disable the MAC core */
daac3bbe	64	xgmac_mac_disable(reg->ioaddr);
713cc334 EA	65
	66	return 0;
	67	}
713cc334	68
680742f6 EA	69	module_vfio_reset_handler("calxeda,hb-xgmac", vfio_platform_calxedaxgmac_reset);
680742f6 EA	70
713cc334 EA	71	MODULE_VERSION(DRIVER_VERSION);
	72	MODULE_LICENSE("GPL v2");
	73	MODULE_AUTHOR(DRIVER_AUTHOR);
	74	MODULE_DESCRIPTION(DRIVER_DESC);