Merge tag 'for-5.11-rc4-tag' of git://git.kernel.org/pub/scm/linux/kernel/git/kdave...
[platform/kernel/linux-rpi.git] / drivers / uio / uio_netx.c
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
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
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
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");