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_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");