blob: 63cc7f0b2e4a437a4d446b54e4937bcb6ed88876 (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
|
// SPDX-License-Identifier: GPL-2.0-only
/*
* 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
*/
#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"
/* 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 register 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);
}
static int vfio_platform_calxedaxgmac_reset(struct vfio_platform_device *vdev)
{
struct vfio_platform_region *reg = &vdev->regions[0];
if (!reg->ioaddr) {
reg->ioaddr =
ioremap(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;
}
module_vfio_reset_handler("calxeda,hb-xgmac", vfio_platform_calxedaxgmac_reset);
MODULE_VERSION(DRIVER_VERSION);
MODULE_LICENSE("GPL v2");
MODULE_AUTHOR(DRIVER_AUTHOR);
MODULE_DESCRIPTION(DRIVER_DESC);
|
