drivers/uio/uio_cif.c

   1 /*
   2  * UIO Hilscher CIF card driver
   3  *
   4  * (C) 2007 Hans J. Koch <hjk@hansjkoch.de>
   5  * Original code (C) 2005 Benedikt Spranger <b.spranger@linutronix.de>
   6  *
   7  * Licensed under GPL version 2 only.
   8  *
   9  */
  10
  11 #include <linux/device.h>
  12 #include <linux/module.h>
  13 #include <linux/pci.h>
  14 #include <linux/slab.h>
  15 #include <linux/uio_driver.h>
  16
  17 #include <asm/io.h>
  18
  19 #define PLX9030_INTCSR          0x4C
  20 #define INTSCR_INT1_ENABLE      0x01
  21 #define INTSCR_INT1_STATUS      0x04
  22 #define INT1_ENABLED_AND_ACTIVE (INTSCR_INT1_ENABLE | INTSCR_INT1_STATUS)
  23
  24 #define PCI_SUBVENDOR_ID_PEP    0x1518
  25 #define CIF_SUBDEVICE_PROFIBUS  0x430
  26 #define CIF_SUBDEVICE_DEVICENET 0x432
  27
  28
  29 static irqreturn_t hilscher_handler(int irq, struct uio_info *dev_info)
  30 {
  31         void __iomem *plx_intscr = dev_info->mem[0].internal_addr
  32                                         + PLX9030_INTCSR;
  33
  34         if ((ioread8(plx_intscr) & INT1_ENABLED_AND_ACTIVE)
  35             != INT1_ENABLED_AND_ACTIVE)
  36                 return IRQ_NONE;
  37
  38         /* Disable interrupt */
  39         iowrite8(ioread8(plx_intscr) & ~INTSCR_INT1_ENABLE, plx_intscr);
  40         return IRQ_HANDLED;
  41 }
  42
  43 static int hilscher_pci_probe(struct pci_dev *dev,
  44                                         const struct pci_device_id *id)
  45 {
  46         struct uio_info *info;
  47
  48         info = kzalloc(sizeof(struct uio_info), GFP_KERNEL);
  49         if (!info)
  50                 return -ENOMEM;
  51
  52         if (pci_enable_device(dev))
  53                 goto out_free;
  54
  55         if (pci_request_regions(dev, "hilscher"))
  56                 goto out_disable;
  57
  58         info->mem[0].addr = pci_resource_start(dev, 0);
  59         if (!info->mem[0].addr)
  60                 goto out_release;
  61         info->mem[0].internal_addr = pci_ioremap_bar(dev, 0);
  62         if (!info->mem[0].internal_addr)
  63                 goto out_release;
  64
  65         info->mem[0].size = pci_resource_len(dev, 0);
  66         info->mem[0].memtype = UIO_MEM_PHYS;
  67         info->mem[1].addr = pci_resource_start(dev, 2);
  68         info->mem[1].size = pci_resource_len(dev, 2);
  69         info->mem[1].memtype = UIO_MEM_PHYS;
  70         switch (id->subdevice) {
  71                 case CIF_SUBDEVICE_PROFIBUS:
  72                         info->name = "CIF_Profibus";
  73                         break;
  74                 case CIF_SUBDEVICE_DEVICENET:
  75                         info->name = "CIF_Devicenet";
  76                         break;
  77                 default:
  78                         info->name = "CIF_???";
  79         }
  80         info->version = "0.0.1";
  81         info->irq = dev->irq;
  82         info->irq_flags = IRQF_SHARED;
  83         info->handler = hilscher_handler;
  84
  85         if (uio_register_device(&dev->dev, info))
  86                 goto out_unmap;
  87
  88         pci_set_drvdata(dev, info);
  89
  90         return 0;
  91 out_unmap:
  92         iounmap(info->mem[0].internal_addr);
  93 out_release:
  94         pci_release_regions(dev);
  95 out_disable:
  96         pci_disable_device(dev);
  97 out_free:
  98         kfree (info);
  99         return -ENODEV;
 100 }
 101
 102 static void hilscher_pci_remove(struct pci_dev *dev)
 103 {
 104         struct uio_info *info = pci_get_drvdata(dev);
 105
 106         uio_unregister_device(info);
 107         pci_release_regions(dev);
 108         pci_disable_device(dev);
 109         pci_set_drvdata(dev, NULL);
 110         iounmap(info->mem[0].internal_addr);
 111
 112         kfree (info);
 113 }
 114
 115 static struct pci_device_id hilscher_pci_ids[] = {
 116         {
 117                 .vendor =       PCI_VENDOR_ID_PLX,
 118                 .device =       PCI_DEVICE_ID_PLX_9030,
 119                 .subvendor =    PCI_SUBVENDOR_ID_PEP,
 120                 .subdevice =    CIF_SUBDEVICE_PROFIBUS,
 121         },
 122         {
 123                 .vendor =       PCI_VENDOR_ID_PLX,
 124                 .device =       PCI_DEVICE_ID_PLX_9030,
 125                 .subvendor =    PCI_SUBVENDOR_ID_PEP,
 126                 .subdevice =    CIF_SUBDEVICE_DEVICENET,
 127         },
 128         { 0, }
 129 };
 130
 131 static struct pci_driver hilscher_pci_driver = {
 132         .name = "hilscher",
 133         .id_table = hilscher_pci_ids,
 134         .probe = hilscher_pci_probe,
 135         .remove = hilscher_pci_remove,
 136 };
 137
 138 static int __init hilscher_init_module(void)
 139 {
 140         return pci_register_driver(&hilscher_pci_driver);
 141 }
 142
 143 static void __exit hilscher_exit_module(void)
 144 {
 145         pci_unregister_driver(&hilscher_pci_driver);
 146 }
 147
 148 module_init(hilscher_init_module);
 149 module_exit(hilscher_exit_module);
 150
 151 MODULE_DEVICE_TABLE(pci, hilscher_pci_ids);
 152 MODULE_LICENSE("GPL v2");
 153 MODULE_AUTHOR("Hans J. Koch, Benedikt Spranger");