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authorEric Auger <eric.auger@linaro.org>2015-06-15 12:09:45 +0300
committerAlex Williamson <alex.williamson@redhat.com>2015-06-22 18:35:38 +0300
commit713cc334a6cc20dd1740933bf49d804b081bbca0 (patch)
tree8d853639cae0648d789b06ab4201167b7110fad0 /drivers/vfio
parent3eeb0d510c65e777030156f03c116393095a3248 (diff)
downloadlinux-713cc334a6cc20dd1740933bf49d804b081bbca0.tar.xz
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: Eric Auger <eric.auger@linaro.org> Acked-by: Baptiste Reynal <b.reynal@virtualopensystems.com> Tested-by: Baptiste Reynal <b.reynal@virtualopensystems.com> Signed-off-by: Alex Williamson <alex.williamson@redhat.com>
Diffstat (limited to 'drivers/vfio')
-rw-r--r--drivers/vfio/platform/Kconfig2
-rw-r--r--drivers/vfio/platform/Makefile2
-rw-r--r--drivers/vfio/platform/reset/Kconfig7
-rw-r--r--drivers/vfio/platform/reset/Makefile5
-rw-r--r--drivers/vfio/platform/reset/vfio_platform_calxedaxgmac.c86
-rw-r--r--drivers/vfio/platform/vfio_platform_common.c5
6 files changed, 107 insertions, 0 deletions
diff --git a/drivers/vfio/platform/Kconfig b/drivers/vfio/platform/Kconfig
index 9a4403e2a36c..1df74772d1b7 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 81de144c0eaa..9ce8afe28450 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 000000000000..746b96b0003b
--- /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 000000000000..2a486af9f8fa
--- /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 000000000000..619dc7d22082
--- /dev/null
+++ b/drivers/vfio/platform/reset/vfio_platform_calxedaxgmac.c
@@ -0,0 +1,86 @@
+/*
+ * 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);
diff --git a/drivers/vfio/platform/vfio_platform_common.c b/drivers/vfio/platform/vfio_platform_common.c
index f3391a93bc0c..e43efb5e92bf 100644
--- a/drivers/vfio/platform/vfio_platform_common.c
+++ b/drivers/vfio/platform/vfio_platform_common.c
@@ -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,