tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
1/*
2 * VFIO platform driver specialized for Calxeda xgmac reset
3 * reset code is inherited from calxeda xgmac native driver
4 *
5 * Copyright 2010-2011 Calxeda, Inc.
6 * Copyright (c) 2015 Linaro Ltd.
7 * www.linaro.org
8 *
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.
12 *
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.
17 *
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/>.
20 */
21
22#include <linux/module.h>
23#include <linux/kernel.h>
24#include <linux/init.h>
25#include <linux/io.h>
26
27#include "vfio_platform_private.h"
28
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"
32
33#define CALXEDAXGMAC_COMPAT "calxeda,hb-xgmac"
34
35/* XGMAC Register definitions */
36#define XGMAC_CONTROL 0x00000000 /* MAC Configuration */
37
38/* DMA Control and Status Registers */
39#define XGMAC_DMA_CONTROL 0x00000f18 /* Ctrl (Operational Mode) */
40#define XGMAC_DMA_INTR_ENA 0x00000f1c /* Interrupt Enable */
41
42/* DMA Control registe defines */
43#define DMA_CONTROL_ST 0x00002000 /* Start/Stop Transmission */
44#define DMA_CONTROL_SR 0x00000002 /* Start/Stop Receive */
45
46/* Common MAC defines */
47#define MAC_ENABLE_TX 0x00000008 /* Transmitter Enable */
48#define MAC_ENABLE_RX 0x00000004 /* Receiver Enable */
49
50static inline void xgmac_mac_disable(void __iomem *ioaddr)
51{
52 u32 value = readl(ioaddr + XGMAC_DMA_CONTROL);
53
54 value &= ~(DMA_CONTROL_ST | DMA_CONTROL_SR);
55 writel(value, ioaddr + XGMAC_DMA_CONTROL);
56
57 value = readl(ioaddr + XGMAC_CONTROL);
58 value &= ~(MAC_ENABLE_TX | MAC_ENABLE_RX);
59 writel(value, ioaddr + XGMAC_CONTROL);
60}
61
62int vfio_platform_calxedaxgmac_reset(struct vfio_platform_device *vdev)
63{
64 struct vfio_platform_region reg = vdev->regions[0];
65
66 if (!reg.ioaddr) {
67 reg.ioaddr =
68 ioremap_nocache(reg.addr, reg.size);
69 if (!reg.ioaddr)
70 return -ENOMEM;
71 }
72
73 /* disable IRQ */
74 writel(0, reg.ioaddr + XGMAC_DMA_INTR_ENA);
75
76 /* Disable the MAC core */
77 xgmac_mac_disable(reg.ioaddr);
78
79 return 0;
80}
81EXPORT_SYMBOL_GPL(vfio_platform_calxedaxgmac_reset);
82
83MODULE_VERSION(DRIVER_VERSION);
84MODULE_LICENSE("GPL v2");
85MODULE_AUTHOR(DRIVER_AUTHOR);
86MODULE_DESCRIPTION(DRIVER_DESC);