Merge branch 'fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/evalenti/linux...
[linux/fpc-iii.git] / drivers / vfio / platform / reset / vfio_platform_calxedaxgmac.c
blobe3d3d948e6618c9732db62740031f2d8a42c5d0c
1 /*
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.
7 * www.linaro.org
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
16 * more details.
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>
25 #include <linux/io.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 /* XGMAC Register definitions */
34 #define XGMAC_CONTROL 0x00000000 /* MAC Configuration */
36 /* DMA Control and Status Registers */
37 #define XGMAC_DMA_CONTROL 0x00000f18 /* Ctrl (Operational Mode) */
38 #define XGMAC_DMA_INTR_ENA 0x00000f1c /* Interrupt Enable */
40 /* DMA Control registe defines */
41 #define DMA_CONTROL_ST 0x00002000 /* Start/Stop Transmission */
42 #define DMA_CONTROL_SR 0x00000002 /* Start/Stop Receive */
44 /* Common MAC defines */
45 #define MAC_ENABLE_TX 0x00000008 /* Transmitter Enable */
46 #define MAC_ENABLE_RX 0x00000004 /* Receiver Enable */
48 static inline void xgmac_mac_disable(void __iomem *ioaddr)
50 u32 value = readl(ioaddr + XGMAC_DMA_CONTROL);
52 value &= ~(DMA_CONTROL_ST | DMA_CONTROL_SR);
53 writel(value, ioaddr + XGMAC_DMA_CONTROL);
55 value = readl(ioaddr + XGMAC_CONTROL);
56 value &= ~(MAC_ENABLE_TX | MAC_ENABLE_RX);
57 writel(value, ioaddr + XGMAC_CONTROL);
60 int vfio_platform_calxedaxgmac_reset(struct vfio_platform_device *vdev)
62 struct vfio_platform_region *reg = &vdev->regions[0];
64 if (!reg->ioaddr) {
65 reg->ioaddr =
66 ioremap_nocache(reg->addr, reg->size);
67 if (!reg->ioaddr)
68 return -ENOMEM;
71 /* disable IRQ */
72 writel(0, reg->ioaddr + XGMAC_DMA_INTR_ENA);
74 /* Disable the MAC core */
75 xgmac_mac_disable(reg->ioaddr);
77 return 0;
80 module_vfio_reset_handler("calxeda,hb-xgmac", vfio_platform_calxedaxgmac_reset);
82 MODULE_VERSION(DRIVER_VERSION);
83 MODULE_LICENSE("GPL v2");
84 MODULE_AUTHOR(DRIVER_AUTHOR);
85 MODULE_DESCRIPTION(DRIVER_DESC);