xref: /openbmc/linux/drivers/uio/uio_netx.c (revision 4800cd83)
1 /*
2  * UIO driver for Hilscher NetX based fieldbus cards (cifX, comX).
3  * See http://www.hilscher.com for details.
4  *
5  * (C) 2007 Hans J. Koch <hjk@hansjkoch.de>
6  * (C) 2008 Manuel Traut <manut@linutronix.de>
7  *
8  * Licensed under GPL version 2 only.
9  *
10  */
11 
12 #include <linux/device.h>
13 #include <linux/io.h>
14 #include <linux/module.h>
15 #include <linux/pci.h>
16 #include <linux/slab.h>
17 #include <linux/uio_driver.h>
18 
19 #define PCI_VENDOR_ID_HILSCHER		0x15CF
20 #define PCI_DEVICE_ID_HILSCHER_NETX	0x0000
21 #define PCI_SUBDEVICE_ID_NXSB_PCA	0x3235
22 #define PCI_SUBDEVICE_ID_NXPCA		0x3335
23 
24 #define DPM_HOST_INT_EN0	0xfff0
25 #define DPM_HOST_INT_STAT0	0xffe0
26 
27 #define DPM_HOST_INT_MASK	0xe600ffff
28 #define DPM_HOST_INT_GLOBAL_EN	0x80000000
29 
30 static irqreturn_t netx_handler(int irq, struct uio_info *dev_info)
31 {
32 	void __iomem *int_enable_reg = dev_info->mem[0].internal_addr
33 					+ DPM_HOST_INT_EN0;
34 	void __iomem *int_status_reg = dev_info->mem[0].internal_addr
35 					+ DPM_HOST_INT_STAT0;
36 
37 	/* Is one of our interrupts enabled and active ? */
38 	if (!(ioread32(int_enable_reg) & ioread32(int_status_reg)
39 		& DPM_HOST_INT_MASK))
40 		return IRQ_NONE;
41 
42 	/* Disable interrupt */
43 	iowrite32(ioread32(int_enable_reg) & ~DPM_HOST_INT_GLOBAL_EN,
44 		int_enable_reg);
45 	return IRQ_HANDLED;
46 }
47 
48 static int __devinit netx_pci_probe(struct pci_dev *dev,
49 					const struct pci_device_id *id)
50 {
51 	struct uio_info *info;
52 	int bar;
53 
54 	info = kzalloc(sizeof(struct uio_info), GFP_KERNEL);
55 	if (!info)
56 		return -ENOMEM;
57 
58 	if (pci_enable_device(dev))
59 		goto out_free;
60 
61 	if (pci_request_regions(dev, "netx"))
62 		goto out_disable;
63 
64 	switch (id->device) {
65 	case PCI_DEVICE_ID_HILSCHER_NETX:
66 		bar = 0;
67 		info->name = "netx";
68 		break;
69 	default:
70 		bar = 2;
71 		info->name = "netx_plx";
72 	}
73 
74 	/* BAR0 or 2 points to the card's dual port memory */
75 	info->mem[0].addr = pci_resource_start(dev, bar);
76 	if (!info->mem[0].addr)
77 		goto out_release;
78 	info->mem[0].internal_addr = ioremap(pci_resource_start(dev, bar),
79 						pci_resource_len(dev, bar));
80 
81 	if (!info->mem[0].internal_addr)
82 			goto out_release;
83 
84 	info->mem[0].size = pci_resource_len(dev, bar);
85 	info->mem[0].memtype = UIO_MEM_PHYS;
86 	info->irq = dev->irq;
87 	info->irq_flags = IRQF_SHARED;
88 	info->handler = netx_handler;
89 	info->version = "0.0.1";
90 
91 	/* Make sure all interrupts are disabled */
92 	iowrite32(0, info->mem[0].internal_addr + DPM_HOST_INT_EN0);
93 
94 	if (uio_register_device(&dev->dev, info))
95 		goto out_unmap;
96 
97 	pci_set_drvdata(dev, info);
98 	dev_info(&dev->dev, "Found %s card, registered UIO device.\n",
99 				info->name);
100 
101 	return 0;
102 
103 out_unmap:
104 	iounmap(info->mem[0].internal_addr);
105 out_release:
106 	pci_release_regions(dev);
107 out_disable:
108 	pci_disable_device(dev);
109 out_free:
110 	kfree(info);
111 	return -ENODEV;
112 }
113 
114 static void netx_pci_remove(struct pci_dev *dev)
115 {
116 	struct uio_info *info = pci_get_drvdata(dev);
117 
118 	/* Disable all interrupts */
119 	iowrite32(0, info->mem[0].internal_addr + DPM_HOST_INT_EN0);
120 	uio_unregister_device(info);
121 	pci_release_regions(dev);
122 	pci_disable_device(dev);
123 	pci_set_drvdata(dev, NULL);
124 	iounmap(info->mem[0].internal_addr);
125 
126 	kfree(info);
127 }
128 
129 static struct pci_device_id netx_pci_ids[] = {
130 	{
131 		.vendor =	PCI_VENDOR_ID_HILSCHER,
132 		.device =	PCI_DEVICE_ID_HILSCHER_NETX,
133 		.subvendor =	0,
134 		.subdevice =	0,
135 	},
136 	{
137 		.vendor =	PCI_VENDOR_ID_PLX,
138 		.device =	PCI_DEVICE_ID_PLX_9030,
139 		.subvendor =	PCI_VENDOR_ID_PLX,
140 		.subdevice =	PCI_SUBDEVICE_ID_NXSB_PCA,
141 	},
142 	{
143 		.vendor =	PCI_VENDOR_ID_PLX,
144 		.device =	PCI_DEVICE_ID_PLX_9030,
145 		.subvendor =	PCI_VENDOR_ID_PLX,
146 		.subdevice =	PCI_SUBDEVICE_ID_NXPCA,
147 	},
148 	{ 0, }
149 };
150 
151 static struct pci_driver netx_pci_driver = {
152 	.name = "netx",
153 	.id_table = netx_pci_ids,
154 	.probe = netx_pci_probe,
155 	.remove = netx_pci_remove,
156 };
157 
158 static int __init netx_init_module(void)
159 {
160 	return pci_register_driver(&netx_pci_driver);
161 }
162 
163 static void __exit netx_exit_module(void)
164 {
165 	pci_unregister_driver(&netx_pci_driver);
166 }
167 
168 module_init(netx_init_module);
169 module_exit(netx_exit_module);
170 
171 MODULE_DEVICE_TABLE(pci, netx_pci_ids);
172 MODULE_LICENSE("GPL v2");
173 MODULE_AUTHOR("Hans J. Koch, Manuel Traut");
174