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         pci_set_drvdata(dev, NULL);
 131         iounmap(info->mem[0].internal_addr);
 132
 133         kfree(info);
 134 }
 135
 136 static struct pci_device_id netx_pci_ids[] = {
 137         {
 138                 .vendor =       PCI_VENDOR_ID_HILSCHER,
 139                 .device =       PCI_DEVICE_ID_HILSCHER_NETX,
 140                 .subvendor =    0,
 141                 .subdevice =    0,
 142         },
 143         {
 144                 .vendor =       PCI_VENDOR_ID_HILSCHER,
 145                 .device =       PCI_DEVICE_ID_HILSCHER_NETPLC,
 146                 .subvendor =    PCI_VENDOR_ID_HILSCHER,
 147                 .subdevice =    PCI_SUBDEVICE_ID_NETPLC_RAM,
 148         },
 149         {
 150                 .vendor =       PCI_VENDOR_ID_HILSCHER,
 151                 .device =       PCI_DEVICE_ID_HILSCHER_NETPLC,
 152                 .subvendor =    PCI_VENDOR_ID_HILSCHER,
 153                 .subdevice =    PCI_SUBDEVICE_ID_NETPLC_FLASH,
 154         },
 155         {
 156                 .vendor =       PCI_VENDOR_ID_PLX,
 157                 .device =       PCI_DEVICE_ID_PLX_9030,
 158                 .subvendor =    PCI_VENDOR_ID_PLX,
 159                 .subdevice =    PCI_SUBDEVICE_ID_NXSB_PCA,
 160         },
 161         {
 162                 .vendor =       PCI_VENDOR_ID_PLX,
 163                 .device =       PCI_DEVICE_ID_PLX_9030,
 164                 .subvendor =    PCI_VENDOR_ID_PLX,
 165                 .subdevice =    PCI_SUBDEVICE_ID_NXPCA,
 166         },
 167         { 0, }
 168 };
 169
 170 static struct pci_driver netx_pci_driver = {
 171         .name = "netx",
 172         .id_table = netx_pci_ids,
 173         .probe = netx_pci_probe,
 174         .remove = netx_pci_remove,
 175 };
 176
 177 static int __init netx_init_module(void)
 178 {
 179         return pci_register_driver(&netx_pci_driver);
 180 }
 181
 182 static void __exit netx_exit_module(void)
 183 {
 184         pci_unregister_driver(&netx_pci_driver);
 185 }
 186
 187 module_init(netx_init_module);
 188 module_exit(netx_exit_module);
 189
 190 MODULE_DEVICE_TABLE(pci, netx_pci_ids);
 191 MODULE_LICENSE("GPL v2");
 192 MODULE_AUTHOR("Hans J. Koch, Manuel Traut");