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Commit 713cc334 authored by Eric Auger's avatar Eric Auger Committed by Alex Williamson
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VFIO: platform: Calxeda xgmac reset module 



This patch introduces a module that registers and implements a basic
reset function for the Calxeda xgmac device. This latter basically disables
interrupts and stops DMA transfers.

The reset function code is inherited from the native calxeda xgmac driver.

Signed-off-by: default avatarEric Auger <eric.auger@linaro.org>
Acked-by: default avatarBaptiste Reynal <b.reynal@virtualopensystems.com>
Tested-by: default avatarBaptiste Reynal <b.reynal@virtualopensystems.com>
Signed-off-by: default avatarAlex Williamson <alex.williamson@redhat.com>
parent 3eeb0d51

drivers/vfio/platform/Kconfig

+2 −0
Original line number Original line Diff line number Diff line
@@ -18,3 +18,5 @@ config VFIO_AMBA 
	  framework.

	  framework.





	  If you don't know what to do here, say N.

	  If you don't know what to do here, say N.



source "drivers/vfio/platform/reset/Kconfig"

drivers/vfio/platform/Makefile

+2 −0
Original line number Original line Diff line number Diff line
@@ -2,7 +2,9 @@ 
vfio-platform-y := vfio_platform.o vfio_platform_common.o vfio_platform_irq.o

vfio-platform-y := vfio_platform.o vfio_platform_common.o vfio_platform_irq.o





obj-$(CONFIG_VFIO_PLATFORM) += vfio-platform.o

obj-$(CONFIG_VFIO_PLATFORM) += vfio-platform.o

obj-$(CONFIG_VFIO_PLATFORM) += reset/





vfio-amba-y := vfio_amba.o

vfio-amba-y := vfio_amba.o





obj-$(CONFIG_VFIO_AMBA) += vfio-amba.o

obj-$(CONFIG_VFIO_AMBA) += vfio-amba.o

obj-$(CONFIG_VFIO_AMBA) += reset/

drivers/vfio/platform/reset/Kconfig

0 → 100644
+7 −0
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config VFIO_PLATFORM_CALXEDAXGMAC_RESET

	tristate "VFIO support for calxeda xgmac reset"

	depends on VFIO_PLATFORM

	help

	  Enables the VFIO platform driver to handle reset for Calxeda xgmac



	  If you don't know what to do here, say N.

drivers/vfio/platform/reset/Makefile

0 → 100644
+5 −0
Original line number Original line Diff line number Diff line 
vfio-platform-calxedaxgmac-y := vfio_platform_calxedaxgmac.o



ccflags-y += -Idrivers/vfio/platform



obj-$(CONFIG_VFIO_PLATFORM_CALXEDAXGMAC_RESET) += vfio-platform-calxedaxgmac.o

drivers/vfio/platform/reset/vfio_platform_calxedaxgmac.c

0 → 100644
+86 −0
Original line number Original line Diff line number Diff line 
/*

 * 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

 *

 * This program is free software; you can redistribute it and/or modify it

 * under the terms and conditions of the GNU General Public License,

 * version 2, as published by the Free Software Foundation.

 *

 * This program is distributed in the hope it will be useful, but WITHOUT

 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for

 * more details.

 *

 * You should have received a copy of the GNU General Public License along with

 * this program.  If not, see <http://www.gnu.org/licenses/>.

 */



#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"



#define CALXEDAXGMAC_COMPAT "calxeda,hb-xgmac"



/* 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);

}



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;

}

EXPORT_SYMBOL_GPL(vfio_platform_calxedaxgmac_reset);



MODULE_VERSION(DRIVER_VERSION);

MODULE_LICENSE("GPL v2");

MODULE_AUTHOR(DRIVER_AUTHOR);

MODULE_DESCRIPTION(DRIVER_DESC);