2 * VFIO platform driver specialized for Calxeda xgmac reset
3 * reset code is inherited from calxeda xgmac native driver
5 * Copyright 2010-2011 Calxeda, Inc.
6 * Copyright (c) 2015 Linaro Ltd.
9 * This program is free software; you can redistribute it and/or modify it
10 * under the terms and conditions of the GNU General Public License,
11 * version 2, as published by the Free Software Foundation.
13 * This program is distributed in the hope it will be useful, but WITHOUT
14 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
15 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
18 * You should have received a copy of the GNU General Public License along with
19 * this program. If not, see <http://www.gnu.org/licenses/>.
22 #include <linux/module.h>
23 #include <linux/kernel.h>
24 #include <linux/init.h>
27 #include "vfio_platform_private.h"
29 #define DRIVER_VERSION "0.1"
30 #define DRIVER_AUTHOR "Eric Auger <eric.auger@linaro.org>"
31 #define DRIVER_DESC "Reset support for Calxeda xgmac vfio platform device"
33 #define CALXEDAXGMAC_COMPAT "calxeda,hb-xgmac"
35 /* XGMAC Register definitions */
36 #define XGMAC_CONTROL 0x00000000 /* MAC Configuration */
38 /* DMA Control and Status Registers */
39 #define XGMAC_DMA_CONTROL 0x00000f18 /* Ctrl (Operational Mode) */
40 #define XGMAC_DMA_INTR_ENA 0x00000f1c /* Interrupt Enable */
42 /* DMA Control registe defines */
43 #define DMA_CONTROL_ST 0x00002000 /* Start/Stop Transmission */
44 #define DMA_CONTROL_SR 0x00000002 /* Start/Stop Receive */
46 /* Common MAC defines */
47 #define MAC_ENABLE_TX 0x00000008 /* Transmitter Enable */
48 #define MAC_ENABLE_RX 0x00000004 /* Receiver Enable */
50 static inline void xgmac_mac_disable(void __iomem *ioaddr)
52 u32 value = readl(ioaddr + XGMAC_DMA_CONTROL);
54 value &= ~(DMA_CONTROL_ST | DMA_CONTROL_SR);
55 writel(value, ioaddr + XGMAC_DMA_CONTROL);
57 value = readl(ioaddr + XGMAC_CONTROL);
58 value &= ~(MAC_ENABLE_TX | MAC_ENABLE_RX);
59 writel(value, ioaddr + XGMAC_CONTROL);
62 int vfio_platform_calxedaxgmac_reset(struct vfio_platform_device *vdev)
64 struct vfio_platform_region reg = vdev->regions[0];
68 ioremap_nocache(reg.addr, reg.size);
74 writel(0, reg.ioaddr + XGMAC_DMA_INTR_ENA);
76 /* Disable the MAC core */
77 xgmac_mac_disable(reg.ioaddr);
81 EXPORT_SYMBOL_GPL(vfio_platform_calxedaxgmac_reset);
83 MODULE_VERSION(DRIVER_VERSION);
84 MODULE_LICENSE("GPL v2");
85 MODULE_AUTHOR(DRIVER_AUTHOR);
86 MODULE_DESCRIPTION(DRIVER_DESC);