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Linux/drivers/uio/uio_netx.c

  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_DEVICE_ID_HILSCHER_NETPLC   0x0010
 22 #define PCI_SUBDEVICE_ID_NETPLC_RAM     0x0000
 23 #define PCI_SUBDEVICE_ID_NETPLC_FLASH   0x0001
 24 #define PCI_SUBDEVICE_ID_NXSB_PCA       0x3235
 25 #define PCI_SUBDEVICE_ID_NXPCA          0x3335
 26 
 27 #define DPM_HOST_INT_EN0        0xfff0
 28 #define DPM_HOST_INT_STAT0      0xffe0
 29 
 30 #define DPM_HOST_INT_MASK       0xe600ffff
 31 #define DPM_HOST_INT_GLOBAL_EN  0x80000000
 32 
 33 static irqreturn_t netx_handler(int irq, struct uio_info *dev_info)
 34 {
 35         void __iomem *int_enable_reg = dev_info->mem[0].internal_addr
 36                                         + DPM_HOST_INT_EN0;
 37         void __iomem *int_status_reg = dev_info->mem[0].internal_addr
 38                                         + DPM_HOST_INT_STAT0;
 39 
 40         /* Is one of our interrupts enabled and active ? */
 41         if (!(ioread32(int_enable_reg) & ioread32(int_status_reg)
 42                 & DPM_HOST_INT_MASK))
 43                 return IRQ_NONE;
 44 
 45         /* Disable interrupt */
 46         iowrite32(ioread32(int_enable_reg) & ~DPM_HOST_INT_GLOBAL_EN,
 47                 int_enable_reg);
 48         return IRQ_HANDLED;
 49 }
 50 
 51 static int netx_pci_probe(struct pci_dev *dev,
 52                                         const struct pci_device_id *id)
 53 {
 54         struct uio_info *info;
 55         int bar;
 56 
 57         info = kzalloc(sizeof(struct uio_info), GFP_KERNEL);
 58         if (!info)
 59                 return -ENOMEM;
 60 
 61         if (pci_enable_device(dev))
 62                 goto out_free;
 63 
 64         if (pci_request_regions(dev, "netx"))
 65                 goto out_disable;
 66 
 67         switch (id->device) {
 68         case PCI_DEVICE_ID_HILSCHER_NETX:
 69                 bar = 0;
 70                 info->name = "netx";
 71                 break;
 72         case PCI_DEVICE_ID_HILSCHER_NETPLC:
 73                 bar = 0;
 74                 info->name = "netplc";
 75                 break;
 76         default:
 77                 bar = 2;
 78                 info->name = "netx_plx";
 79         }
 80 
 81         /* BAR0 or 2 points to the card's dual port memory */
 82         info->mem[0].addr = pci_resource_start(dev, bar);
 83         if (!info->mem[0].addr)
 84                 goto out_release;
 85         info->mem[0].internal_addr = ioremap(pci_resource_start(dev, bar),
 86                                                 pci_resource_len(dev, bar));
 87 
 88         if (!info->mem[0].internal_addr)
 89                         goto out_release;
 90 
 91         info->mem[0].size = pci_resource_len(dev, bar);
 92         info->mem[0].memtype = UIO_MEM_PHYS;
 93         info->irq = dev->irq;
 94         info->irq_flags = IRQF_SHARED;
 95         info->handler = netx_handler;
 96         info->version = "0.0.1";
 97 
 98         /* Make sure all interrupts are disabled */
 99         iowrite32(0, info->mem[0].internal_addr + DPM_HOST_INT_EN0);
100 
101         if (uio_register_device(&dev->dev, info))
102                 goto out_unmap;
103 
104         pci_set_drvdata(dev, info);
105         dev_info(&dev->dev, "Found %s card, registered UIO device.\n",
106                                 info->name);
107 
108         return 0;
109 
110 out_unmap:
111         iounmap(info->mem[0].internal_addr);
112 out_release:
113         pci_release_regions(dev);
114 out_disable:
115         pci_disable_device(dev);
116 out_free:
117         kfree(info);
118         return -ENODEV;
119 }
120 
121 static void netx_pci_remove(struct pci_dev *dev)
122 {
123         struct uio_info *info = pci_get_drvdata(dev);
124 
125         /* Disable all interrupts */
126         iowrite32(0, info->mem[0].internal_addr + DPM_HOST_INT_EN0);
127         uio_unregister_device(info);
128         pci_release_regions(dev);
129         pci_disable_device(dev);
130         iounmap(info->mem[0].internal_addr);
131 
132         kfree(info);
133 }
134 
135 static struct pci_device_id netx_pci_ids[] = {
136         {
137                 .vendor =       PCI_VENDOR_ID_HILSCHER,
138                 .device =       PCI_DEVICE_ID_HILSCHER_NETX,
139                 .subvendor =    0,
140                 .subdevice =    0,
141         },
142         {
143                 .vendor =       PCI_VENDOR_ID_HILSCHER,
144                 .device =       PCI_DEVICE_ID_HILSCHER_NETPLC,
145                 .subvendor =    PCI_VENDOR_ID_HILSCHER,
146                 .subdevice =    PCI_SUBDEVICE_ID_NETPLC_RAM,
147         },
148         {
149                 .vendor =       PCI_VENDOR_ID_HILSCHER,
150                 .device =       PCI_DEVICE_ID_HILSCHER_NETPLC,
151                 .subvendor =    PCI_VENDOR_ID_HILSCHER,
152                 .subdevice =    PCI_SUBDEVICE_ID_NETPLC_FLASH,
153         },
154         {
155                 .vendor =       PCI_VENDOR_ID_PLX,
156                 .device =       PCI_DEVICE_ID_PLX_9030,
157                 .subvendor =    PCI_VENDOR_ID_PLX,
158                 .subdevice =    PCI_SUBDEVICE_ID_NXSB_PCA,
159         },
160         {
161                 .vendor =       PCI_VENDOR_ID_PLX,
162                 .device =       PCI_DEVICE_ID_PLX_9030,
163                 .subvendor =    PCI_VENDOR_ID_PLX,
164                 .subdevice =    PCI_SUBDEVICE_ID_NXPCA,
165         },
166         { 0, }
167 };
168 
169 static struct pci_driver netx_pci_driver = {
170         .name = "netx",
171         .id_table = netx_pci_ids,
172         .probe = netx_pci_probe,
173         .remove = netx_pci_remove,
174 };
175 
176 module_pci_driver(netx_pci_driver);
177 MODULE_DEVICE_TABLE(pci, netx_pci_ids);
178 MODULE_LICENSE("GPL v2");
179 MODULE_AUTHOR("Hans J. Koch, Manuel Traut");
180 

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