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: Eric Auger <eric.auger@xxxxxxxxxx> --- drivers/vfio/platform/Kconfig | 2 + drivers/vfio/platform/Makefile | 2 + drivers/vfio/platform/reset/Kconfig | 7 ++ drivers/vfio/platform/reset/Makefile | 5 + .../platform/reset/vfio_platform_calxedaxgmac.c | 121 +++++++++++++++++++++ 5 files changed, 137 insertions(+) create mode 100644 drivers/vfio/platform/reset/Kconfig create mode 100644 drivers/vfio/platform/reset/Makefile create mode 100644 drivers/vfio/platform/reset/vfio_platform_calxedaxgmac.c diff --git a/drivers/vfio/platform/Kconfig b/drivers/vfio/platform/Kconfig index 9a4403e..1df7477 100644 --- a/drivers/vfio/platform/Kconfig +++ b/drivers/vfio/platform/Kconfig @@ -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" diff --git a/drivers/vfio/platform/Makefile b/drivers/vfio/platform/Makefile index 81de144..9ce8afe 100644 --- a/drivers/vfio/platform/Makefile +++ b/drivers/vfio/platform/Makefile @@ -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/ diff --git a/drivers/vfio/platform/reset/Kconfig b/drivers/vfio/platform/reset/Kconfig new file mode 100644 index 0000000..746b96b --- /dev/null +++ b/drivers/vfio/platform/reset/Kconfig @@ -0,0 +1,7 @@ +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. diff --git a/drivers/vfio/platform/reset/Makefile b/drivers/vfio/platform/reset/Makefile new file mode 100644 index 0000000..2a486af --- /dev/null +++ b/drivers/vfio/platform/reset/Makefile @@ -0,0 +1,5 @@ +vfio-platform-calxedaxgmac-y := vfio_platform_calxedaxgmac.o + +ccflags-y += -Idrivers/vfio/platform + +obj-$(CONFIG_VFIO_PLATFORM_CALXEDAXGMAC_RESET) += vfio-platform-calxedaxgmac.o diff --git a/drivers/vfio/platform/reset/vfio_platform_calxedaxgmac.c b/drivers/vfio/platform/reset/vfio_platform_calxedaxgmac.c new file mode 100644 index 0000000..3c6e428 --- /dev/null +++ b/drivers/vfio/platform/reset/vfio_platform_calxedaxgmac.c @@ -0,0 +1,121 @@ +/* + * 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@xxxxxxxxxx>" +#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); + +static int __init vfio_platform_calxedaxgmac_init(void) +{ + int (*register_reset)(char *, struct module *, + vfio_platform_reset_fn_t); + int ret; + + register_reset = symbol_get(vfio_platform_register_reset); + if (!register_reset) + return -EINVAL; + + ret = register_reset(CALXEDAXGMAC_COMPAT, THIS_MODULE, + vfio_platform_calxedaxgmac_reset); + + symbol_put(vfio_platform_register_reset); + + return ret; +} + +static void __exit vfio_platform_calxedaxgmac_exit(void) +{ + int (*unregister_reset)(char *); + int ret; + + unregister_reset = symbol_get(vfio_platform_unregister_reset); + if (!unregister_reset) + return; + + ret = unregister_reset(CALXEDAXGMAC_COMPAT); + + symbol_put(vfio_platform_unregister_reset); +} + +module_init(vfio_platform_calxedaxgmac_init); +module_exit(vfio_platform_calxedaxgmac_exit); + +MODULE_VERSION(DRIVER_VERSION); +MODULE_LICENSE("GPL v2"); +MODULE_AUTHOR(DRIVER_AUTHOR); +MODULE_DESCRIPTION(DRIVER_DESC); -- 1.9.1 -- To unsubscribe from this list: send the line "unsubscribe kvm" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
