aboutsummaryrefslogtreecommitdiff
path: root/drivers/uio/uio_netx.c
blob: 2319d6de8d0421dc433a2ba2ed4aa4e1c0ce9160 (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
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
// SPDX-License-Identifier: GPL-2.0
/*
 * UIO driver for Hilscher NetX based fieldbus cards (cifX, comX).
 * See http://www.hilscher.com for details.
 *
 * (C) 2007 Hans J. Koch <hjk@hansjkoch.de>
 * (C) 2008 Manuel Traut <manut@linutronix.de>
 *
 */

#include <linux/device.h>
#include <linux/io.h>
#include <linux/module.h>
#include <linux/pci.h>
#include <linux/slab.h>
#include <linux/uio_driver.h>

#define PCI_VENDOR_ID_HILSCHER		0x15CF
#define PCI_DEVICE_ID_HILSCHER_NETX	0x0000
#define PCI_DEVICE_ID_HILSCHER_NETPLC	0x0010
#define PCI_SUBDEVICE_ID_NETPLC_RAM	0x0000
#define PCI_SUBDEVICE_ID_NETPLC_FLASH	0x0001
#define PCI_SUBDEVICE_ID_NXSB_PCA	0x3235
#define PCI_SUBDEVICE_ID_NXPCA		0x3335

#define DPM_HOST_INT_EN0	0xfff0
#define DPM_HOST_INT_STAT0	0xffe0

#define DPM_HOST_INT_MASK	0xe600ffff
#define DPM_HOST_INT_GLOBAL_EN	0x80000000

static irqreturn_t netx_handler(int irq, struct uio_info *dev_info)
{
	void __iomem *int_enable_reg = dev_info->mem[0].internal_addr
					+ DPM_HOST_INT_EN0;
	void __iomem *int_status_reg = dev_info->mem[0].internal_addr
					+ DPM_HOST_INT_STAT0;

	/* Is one of our interrupts enabled and active ? */
	if (!(ioread32(int_enable_reg) & ioread32(int_status_reg)
		& DPM_HOST_INT_MASK))
		return IRQ_NONE;

	/* Disable interrupt */
	iowrite32(ioread32(int_enable_reg) & ~DPM_HOST_INT_GLOBAL_EN,
		int_enable_reg);
	return IRQ_HANDLED;
}

static int netx_pci_probe(struct pci_dev *dev,
					const struct pci_device_id *id)
{
	struct uio_info *info;
	int bar;

	info = devm_kzalloc(&dev->dev, sizeof(struct uio_info), GFP_KERNEL);
	if (!info)
		return -ENOMEM;

	if (pci_enable_device(dev))
		return -ENODEV;

	if (pci_request_regions(dev, "netx"))
		goto out_disable;

	switch (id->device) {
	case PCI_DEVICE_ID_HILSCHER_NETX:
		bar = 0;
		info->name = "netx";
		break;
	case PCI_DEVICE_ID_HILSCHER_NETPLC:
		bar = 0;
		info->name = "netplc";
		break;
	default:
		bar = 2;
		info->name = "netx_plx";
	}

	/* BAR0 or 2 points to the card's dual port memory */
	info->mem[0].addr = pci_resource_start(dev, bar);
	if (!info->mem[0].addr)
		goto out_release;
	info->mem[0].internal_addr = ioremap(pci_resource_start(dev, bar),
						pci_resource_len(dev, bar));

	if (!info->mem[0].internal_addr)
			goto out_release;

	info->mem[0].size = pci_resource_len(dev, bar);
	info->mem[0].memtype = UIO_MEM_PHYS;
	info->irq = dev->irq;
	info->irq_flags = IRQF_SHARED;
	info->handler = netx_handler;
	info->version = "0.0.1";

	/* Make sure all interrupts are disabled */
	iowrite32(0, info->mem[0].internal_addr + DPM_HOST_INT_EN0);

	if (uio_register_device(&dev->dev, info))
		goto out_unmap;

	pci_set_drvdata(dev, info);
	dev_info(&dev->dev, "Found %s card, registered UIO device.\n",
				info->name);

	return 0;

out_unmap:
	iounmap(info->mem[0].internal_addr);
out_release:
	pci_release_regions(dev);
out_disable:
	pci_disable_device(dev);
	return -ENODEV;
}

static void netx_pci_remove(struct pci_dev *dev)
{
	struct uio_info *info = pci_get_drvdata(dev);

	/* Disable all interrupts */
	iowrite32(0, info->mem[0].internal_addr + DPM_HOST_INT_EN0);
	uio_unregister_device(info);
	pci_release_regions(dev);
	pci_disable_device(dev);
	iounmap(info->mem[0].internal_addr);
}

static struct pci_device_id netx_pci_ids[] = {
	{
		.vendor =	PCI_VENDOR_ID_HILSCHER,
		.device =	PCI_DEVICE_ID_HILSCHER_NETX,
		.subvendor =	0,
		.subdevice =	0,
	},
	{
		.vendor =       PCI_VENDOR_ID_HILSCHER,
		.device =       PCI_DEVICE_ID_HILSCHER_NETPLC,
		.subvendor =    PCI_VENDOR_ID_HILSCHER,
		.subdevice =    PCI_SUBDEVICE_ID_NETPLC_RAM,
	},
	{
		.vendor =       PCI_VENDOR_ID_HILSCHER,
		.device =       PCI_DEVICE_ID_HILSCHER_NETPLC,
		.subvendor =    PCI_VENDOR_ID_HILSCHER,
		.subdevice =    PCI_SUBDEVICE_ID_NETPLC_FLASH,
	},
	{
		.vendor =	PCI_VENDOR_ID_PLX,
		.device =	PCI_DEVICE_ID_PLX_9030,
		.subvendor =	PCI_VENDOR_ID_PLX,
		.subdevice =	PCI_SUBDEVICE_ID_NXSB_PCA,
	},
	{
		.vendor =	PCI_VENDOR_ID_PLX,
		.device =	PCI_DEVICE_ID_PLX_9030,
		.subvendor =	PCI_VENDOR_ID_PLX,
		.subdevice =	PCI_SUBDEVICE_ID_NXPCA,
	},
	{ 0, }
};

static struct pci_driver netx_pci_driver = {
	.name = "netx",
	.id_table = netx_pci_ids,
	.probe = netx_pci_probe,
	.remove = netx_pci_remove,
};

module_pci_driver(netx_pci_driver);
MODULE_DEVICE_TABLE(pci, netx_pci_ids);
MODULE_LICENSE("GPL v2");
MODULE_AUTHOR("Hans J. Koch, Manuel Traut");