drivers/uio/uio_cif.c

   1 /*
   2  * UIO Hilscher CIF card driver
   3  *
   4  * (C) 2007 Hans J. Koch <hjk@linutronix.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/uio_driver.h>
  15
  16 #include <asm/io.h>
  17
  18 #ifndef PCI_DEVICE_ID_PLX_9030
  19 #define PCI_DEVICE_ID_PLX_9030  0x9030
  20 #endif
  21
  22 #define PLX9030_INTCSR          0x4C
  23 #define INTSCR_INT1_ENABLE      0x01
  24 #define INTSCR_INT1_STATUS      0x04
  25 #define INT1_ENABLED_AND_ACTIVE (INTSCR_INT1_ENABLE | INTSCR_INT1_STATUS)
  26
  27 #define PCI_SUBVENDOR_ID_PEP    0x1518
  28 #define CIF_SUBDEVICE_PROFIBUS  0x430
  29 #define CIF_SUBDEVICE_DEVICENET 0x432
  30
  31
  32 static irqreturn_t hilscher_handler(int irq, struct uio_info *dev_info)
  33 {
  34         void __iomem *plx_intscr = dev_info->mem[0].internal_addr
  35                                         + PLX9030_INTCSR;
  36
  37         if ((ioread8(plx_intscr) & INT1_ENABLED_AND_ACTIVE)
  38             != INT1_ENABLED_AND_ACTIVE)
  39                 return IRQ_NONE;
  40
  41         /* Disable interrupt */
  42         iowrite8(ioread8(plx_intscr) & ~INTSCR_INT1_ENABLE, plx_intscr);
  43         return IRQ_HANDLED;
  44 }
  45
  46 static int __devinit hilscher_pci_probe(struct pci_dev *dev,
  47                                         const struct pci_device_id *id)
  48 {
  49         struct uio_info *info;
  50
  51         info = kzalloc(sizeof(struct uio_info), GFP_KERNEL);
  52         if (!info)
  53                 return -ENOMEM;
  54
  55         if (pci_enable_device(dev))
  56                 goto out_free;
  57
  58         if (pci_request_regions(dev, "hilscher"))
  59                 goto out_disable;
  60
  61         info->mem[0].addr = pci_resource_start(dev, 0);
  62         if (!info->mem[0].addr)
  63                 goto out_release;
  64         info->mem[0].internal_addr = ioremap(pci_resource_start(dev, 0),
  65                                              pci_resource_len(dev, 0));
  66         if (!info->mem[0].internal_addr)
  67                 goto out_release;
  68
  69         info->mem[0].size = pci_resource_len(dev, 0);
  70         info->mem[0].memtype = UIO_MEM_PHYS;
  71         info->mem[1].addr = pci_resource_start(dev, 2);
  72         info->mem[1].size = pci_resource_len(dev, 2);
  73         info->mem[1].memtype = UIO_MEM_PHYS;
  74         switch (id->subdevice) {
  75                 case CIF_SUBDEVICE_PROFIBUS:
  76                         info->name = "CIF_Profibus";
  77                         break;
  78                 case CIF_SUBDEVICE_DEVICENET:
  79                         info->name = "CIF_Devicenet";
  80                         break;
  81                 default:
  82                         info->name = "CIF_???";
  83         }
  84         info->version = "0.0.1";
  85         info->irq = dev->irq;
  86         info->irq_flags = IRQF_DISABLED | IRQF_SHARED;
  87         info->handler = hilscher_handler;
  88
  89         if (uio_register_device(&dev->dev, info))
  90                 goto out_unmap;
  91
  92         pci_set_drvdata(dev, info);
  93
  94         return 0;
  95 out_unmap:
  96         iounmap(info->mem[0].internal_addr);
  97 out_release:
  98         pci_release_regions(dev);
  99 out_disable:
 100         pci_disable_device(dev);
 101 out_free:
 102         kfree (info);
 103         return -ENODEV;
 104 }
 105
 106 static void hilscher_pci_remove(struct pci_dev *dev)
 107 {
 108         struct uio_info *info = pci_get_drvdata(dev);
 109
 110         uio_unregister_device(info);
 111         pci_release_regions(dev);
 112         pci_disable_device(dev);
 113         pci_set_drvdata(dev, NULL);
 114         iounmap(info->mem[0].internal_addr);
 115
 116         kfree (info);
 117 }
 118
 119 static struct pci_device_id hilscher_pci_ids[] = {
 120         {
 121                 .vendor =       PCI_VENDOR_ID_PLX,
 122                 .device =       PCI_DEVICE_ID_PLX_9030,
 123                 .subvendor =    PCI_SUBVENDOR_ID_PEP,
 124                 .subdevice =    CIF_SUBDEVICE_PROFIBUS,
 125         },
 126         {
 127                 .vendor =       PCI_VENDOR_ID_PLX,
 128                 .device =       PCI_DEVICE_ID_PLX_9030,
 129                 .subvendor =    PCI_SUBVENDOR_ID_PEP,
 130                 .subdevice =    CIF_SUBDEVICE_DEVICENET,
 131         },
 132         { 0, }
 133 };
 134
 135 static struct pci_driver hilscher_pci_driver = {
 136         .name = "hilscher",
 137         .id_table = hilscher_pci_ids,
 138         .probe = hilscher_pci_probe,
 139         .remove = hilscher_pci_remove,
 140 };
 141
 142 static int __init hilscher_init_module(void)
 143 {
 144         return pci_register_driver(&hilscher_pci_driver);
 145 }
 146
 147 static void __exit hilscher_exit_module(void)
 148 {
 149         pci_unregister_driver(&hilscher_pci_driver);
 150 }
 151
 152 module_init(hilscher_init_module);
 153 module_exit(hilscher_exit_module);
 154
 155 MODULE_LICENSE("GPL v2");
 156 MODULE_AUTHOR("Hans J. Koch, Benedikt Spranger");