diff options
Diffstat (limited to 'kernel/drivers/vfio/platform/reset/vfio_platform_calxedaxgmac.c')
-rw-r--r-- | kernel/drivers/vfio/platform/reset/vfio_platform_calxedaxgmac.c | 85 |
1 files changed, 85 insertions, 0 deletions
diff --git a/kernel/drivers/vfio/platform/reset/vfio_platform_calxedaxgmac.c b/kernel/drivers/vfio/platform/reset/vfio_platform_calxedaxgmac.c new file mode 100644 index 000000000..e3d3d948e --- /dev/null +++ b/kernel/drivers/vfio/platform/reset/vfio_platform_calxedaxgmac.c @@ -0,0 +1,85 @@ +/* + * 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" + +/* 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; +} + +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); |