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