Commit 713cc334 authored by Eric Auger's avatar Eric Auger Committed by Alex Williamson

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
......@@ -18,3 +18,5 @@ config VFIO_AMBA
framework.
If you don't know what to do here, say N.
source "drivers/vfio/platform/reset/Kconfig"
......@@ -2,7 +2,9 @@
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) += reset/
vfio-amba-y := vfio_amba.o
obj-$(CONFIG_VFIO_AMBA) += vfio-amba.o
obj-$(CONFIG_VFIO_AMBA) += reset/
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.
vfio-platform-calxedaxgmac-y := vfio_platform_calxedaxgmac.o
ccflags-y += -Idrivers/vfio/platform
obj-$(CONFIG_VFIO_PLATFORM_CALXEDAXGMAC_RESET) += vfio-platform-calxedaxgmac.o
/*
* 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);
......@@ -26,6 +26,11 @@
static DEFINE_MUTEX(driver_lock);
static const struct vfio_platform_reset_combo reset_lookup_table[] = {
{
.compat = "calxeda,hb-xgmac",
.reset_function_name = "vfio_platform_calxedaxgmac_reset",
.module_name = "vfio-platform-calxedaxgmac",
},
};
static void vfio_platform_get_reset(struct vfio_platform_device *vdev,
......
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