xref: /openbmc/linux/drivers/uio/uio_netx.c (revision c3a74779)
1 // SPDX-License-Identifier: GPL-2.0
2 /*
3  * UIO driver for Hilscher NetX based fieldbus cards (cifX, comX).
4  * See http://www.hilscher.com for details.
5  *
6  * (C) 2007 Hans J. Koch <hjk@hansjkoch.de>
7  * (C) 2008 Manuel Traut <manut@linutronix.de>
8  *
9  */
10 
11 #include <linux/device.h>
12 #include <linux/io.h>
13 #include <linux/module.h>
14 #include <linux/pci.h>
15 #include <linux/slab.h>
16 #include <linux/uio_driver.h>
17 
18 #define PCI_VENDOR_ID_HILSCHER		0x15CF
19 #define PCI_DEVICE_ID_HILSCHER_NETX	0x0000
20 #define PCI_DEVICE_ID_HILSCHER_NETPLC	0x0010
21 #define PCI_SUBDEVICE_ID_NETPLC_RAM	0x0000
22 #define PCI_SUBDEVICE_ID_NETPLC_FLASH	0x0001
23 #define PCI_SUBDEVICE_ID_NXSB_PCA	0x3235
24 #define PCI_SUBDEVICE_ID_NXPCA		0x3335
25 
26 #define DPM_HOST_INT_EN0	0xfff0
27 #define DPM_HOST_INT_STAT0	0xffe0
28 
29 #define DPM_HOST_INT_MASK	0xe600ffff
30 #define DPM_HOST_INT_GLOBAL_EN	0x80000000
31 
netx_handler(int irq,struct uio_info * dev_info)32 static irqreturn_t netx_handler(int irq, struct uio_info *dev_info)
33 {
34 	void __iomem *int_enable_reg = dev_info->mem[0].internal_addr
35 					+ DPM_HOST_INT_EN0;
36 	void __iomem *int_status_reg = dev_info->mem[0].internal_addr
37 					+ DPM_HOST_INT_STAT0;
38 
39 	/* Is one of our interrupts enabled and active ? */
40 	if (!(ioread32(int_enable_reg) & ioread32(int_status_reg)
41 		& DPM_HOST_INT_MASK))
42 		return IRQ_NONE;
43 
44 	/* Disable interrupt */
45 	iowrite32(ioread32(int_enable_reg) & ~DPM_HOST_INT_GLOBAL_EN,
46 		int_enable_reg);
47 	return IRQ_HANDLED;
48 }
49 
netx_pci_probe(struct pci_dev * dev,const struct pci_device_id * id)50 static int netx_pci_probe(struct pci_dev *dev,
51 					const struct pci_device_id *id)
52 {
53 	struct uio_info *info;
54 	int bar;
55 
56 	info = devm_kzalloc(&dev->dev, sizeof(struct uio_info), GFP_KERNEL);
57 	if (!info)
58 		return -ENOMEM;
59 
60 	if (pci_enable_device(dev))
61 		return -ENODEV;
62 
63 	if (pci_request_regions(dev, "netx"))
64 		goto out_disable;
65 
66 	switch (id->device) {
67 	case PCI_DEVICE_ID_HILSCHER_NETX:
68 		bar = 0;
69 		info->name = "netx";
70 		break;
71 	case PCI_DEVICE_ID_HILSCHER_NETPLC:
72 		bar = 0;
73 		info->name = "netplc";
74 		break;
75 	default:
76 		bar = 2;
77 		info->name = "netx_plx";
78 	}
79 
80 	/* BAR0 or 2 points to the card's dual port memory */
81 	info->mem[0].addr = pci_resource_start(dev, bar);
82 	if (!info->mem[0].addr)
83 		goto out_release;
84 	info->mem[0].internal_addr = ioremap(pci_resource_start(dev, bar),
85 						pci_resource_len(dev, bar));
86 
87 	if (!info->mem[0].internal_addr)
88 			goto out_release;
89 
90 	info->mem[0].size = pci_resource_len(dev, bar);
91 	info->mem[0].memtype = UIO_MEM_PHYS;
92 	info->irq = dev->irq;
93 	info->irq_flags = IRQF_SHARED;
94 	info->handler = netx_handler;
95 	info->version = "0.0.1";
96 
97 	/* Make sure all interrupts are disabled */
98 	iowrite32(0, info->mem[0].internal_addr + DPM_HOST_INT_EN0);
99 
100 	if (uio_register_device(&dev->dev, info))
101 		goto out_unmap;
102 
103 	pci_set_drvdata(dev, info);
104 	dev_info(&dev->dev, "Found %s card, registered UIO device.\n",
105 				info->name);
106 
107 	return 0;
108 
109 out_unmap:
110 	iounmap(info->mem[0].internal_addr);
111 out_release:
112 	pci_release_regions(dev);
113 out_disable:
114 	pci_disable_device(dev);
115 	return -ENODEV;
116 }
117 
netx_pci_remove(struct pci_dev * dev)118 static void netx_pci_remove(struct pci_dev *dev)
119 {
120 	struct uio_info *info = pci_get_drvdata(dev);
121 
122 	/* Disable all interrupts */
123 	iowrite32(0, info->mem[0].internal_addr + DPM_HOST_INT_EN0);
124 	uio_unregister_device(info);
125 	pci_release_regions(dev);
126 	pci_disable_device(dev);
127 	iounmap(info->mem[0].internal_addr);
128 }
129 
130 static struct pci_device_id netx_pci_ids[] = {
131 	{
132 		.vendor =	PCI_VENDOR_ID_HILSCHER,
133 		.device =	PCI_DEVICE_ID_HILSCHER_NETX,
134 		.subvendor =	0,
135 		.subdevice =	0,
136 	},
137 	{
138 		.vendor =       PCI_VENDOR_ID_HILSCHER,
139 		.device =       PCI_DEVICE_ID_HILSCHER_NETPLC,
140 		.subvendor =    PCI_VENDOR_ID_HILSCHER,
141 		.subdevice =    PCI_SUBDEVICE_ID_NETPLC_RAM,
142 	},
143 	{
144 		.vendor =       PCI_VENDOR_ID_HILSCHER,
145 		.device =       PCI_DEVICE_ID_HILSCHER_NETPLC,
146 		.subvendor =    PCI_VENDOR_ID_HILSCHER,
147 		.subdevice =    PCI_SUBDEVICE_ID_NETPLC_FLASH,
148 	},
149 	{
150 		.vendor =	PCI_VENDOR_ID_PLX,
151 		.device =	PCI_DEVICE_ID_PLX_9030,
152 		.subvendor =	PCI_VENDOR_ID_PLX,
153 		.subdevice =	PCI_SUBDEVICE_ID_NXSB_PCA,
154 	},
155 	{
156 		.vendor =	PCI_VENDOR_ID_PLX,
157 		.device =	PCI_DEVICE_ID_PLX_9030,
158 		.subvendor =	PCI_VENDOR_ID_PLX,
159 		.subdevice =	PCI_SUBDEVICE_ID_NXPCA,
160 	},
161 	{ 0, }
162 };
163 
164 static struct pci_driver netx_pci_driver = {
165 	.name = "netx",
166 	.id_table = netx_pci_ids,
167 	.probe = netx_pci_probe,
168 	.remove = netx_pci_remove,
169 };
170 
171 module_pci_driver(netx_pci_driver);
172 MODULE_DEVICE_TABLE(pci, netx_pci_ids);
173 MODULE_LICENSE("GPL v2");
174 MODULE_AUTHOR("Hans J. Koch, Manuel Traut");
175