drivers/uio/uio_netx.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * UIO driver for Hilscher NetX based fieldbus cards (cifX, comX).
   4  * See http://www.hilscher.com for details.
   5  *
   6  * (C) 2007 Hans J. Koch <hjk@hansjkoch.de>
   7  * (C) 2008 Manuel Traut <manut@linutronix.de>
   8  *
   9  */
  10
  11 #include <linux/device.h>
  12 #include <linux/io.h>
  13 #include <linux/module.h>
  14 #include <linux/pci.h>
  15 #include <linux/slab.h>
  16 #include <linux/uio_driver.h>
  17
  18 #define PCI_VENDOR_ID_HILSCHER          0x15CF
  19 #define PCI_DEVICE_ID_HILSCHER_NETX     0x0000
  20 #define PCI_DEVICE_ID_HILSCHER_NETPLC   0x0010
  21 #define PCI_SUBDEVICE_ID_NETPLC_RAM     0x0000
  22 #define PCI_SUBDEVICE_ID_NETPLC_FLASH   0x0001
  23 #define PCI_SUBDEVICE_ID_NXSB_PCA       0x3235
  24 #define PCI_SUBDEVICE_ID_NXPCA          0x3335
  25
  26 #define DPM_HOST_INT_EN0        0xfff0
  27 #define DPM_HOST_INT_STAT0      0xffe0
  28
  29 #define DPM_HOST_INT_MASK       0xe600ffff
  30 #define DPM_HOST_INT_GLOBAL_EN  0x80000000
  31
  32 static irqreturn_t netx_handler(int irq, struct uio_info *dev_info)
  33 {
  34         void __iomem *int_enable_reg = dev_info->mem[0].internal_addr
  35                                         + DPM_HOST_INT_EN0;
  36         void __iomem *int_status_reg = dev_info->mem[0].internal_addr
  37                                         + DPM_HOST_INT_STAT0;
  38
  39         /* Is one of our interrupts enabled and active ? */
  40         if (!(ioread32(int_enable_reg) & ioread32(int_status_reg)
  41                 & DPM_HOST_INT_MASK))
  42                 return IRQ_NONE;
  43
  44         /* Disable interrupt */
  45         iowrite32(ioread32(int_enable_reg) & ~DPM_HOST_INT_GLOBAL_EN,
  46                 int_enable_reg);
  47         return IRQ_HANDLED;
  48 }
  49
  50 static int netx_pci_probe(struct pci_dev *dev,
  51                                         const struct pci_device_id *id)
  52 {
  53         struct uio_info *info;
  54         int bar;
  55
  56         info = devm_kzalloc(&dev->dev, sizeof(struct uio_info), GFP_KERNEL);
  57         if (!info)
  58                 return -ENOMEM;
  59
  60         if (pci_enable_device(dev))
  61                 return -ENODEV;
  62
  63         if (pci_request_regions(dev, "netx"))
  64                 goto out_disable;
  65
  66         switch (id->device) {
  67         case PCI_DEVICE_ID_HILSCHER_NETX:
  68                 bar = 0;
  69                 info->name = "netx";
  70                 break;
  71         case PCI_DEVICE_ID_HILSCHER_NETPLC:
  72                 bar = 0;
  73                 info->name = "netplc";
  74                 break;
  75         default:
  76                 bar = 2;
  77                 info->name = "netx_plx";
  78         }
  79
  80         /* BAR0 or 2 points to the card's dual port memory */
  81         info->mem[0].addr = pci_resource_start(dev, bar);
  82         if (!info->mem[0].addr)
  83                 goto out_release;
  84         info->mem[0].internal_addr = ioremap(pci_resource_start(dev, bar),
  85                                                 pci_resource_len(dev, bar));
  86
  87         if (!info->mem[0].internal_addr)
  88                         goto out_release;
  89
  90         info->mem[0].size = pci_resource_len(dev, bar);
  91         info->mem[0].memtype = UIO_MEM_PHYS;
  92         info->irq = dev->irq;
  93         info->irq_flags = IRQF_SHARED;
  94         info->handler = netx_handler;
  95         info->version = "0.0.1";
  96
  97         /* Make sure all interrupts are disabled */
  98         iowrite32(0, info->mem[0].internal_addr + DPM_HOST_INT_EN0);
  99
 100         if (uio_register_device(&dev->dev, info))
 101                 goto out_unmap;
 102
 103         pci_set_drvdata(dev, info);
 104         dev_info(&dev->dev, "Found %s card, registered UIO device.\n",
 105                                 info->name);
 106
 107         return 0;
 108
 109 out_unmap:
 110         iounmap(info->mem[0].internal_addr);
 111 out_release:
 112         pci_release_regions(dev);
 113 out_disable:
 114         pci_disable_device(dev);
 115         return -ENODEV;
 116 }
 117
 118 static void netx_pci_remove(struct pci_dev *dev)
 119 {
 120         struct uio_info *info = pci_get_drvdata(dev);
 121
 122         /* Disable all interrupts */
 123         iowrite32(0, info->mem[0].internal_addr + DPM_HOST_INT_EN0);
 124         uio_unregister_device(info);
 125         pci_release_regions(dev);
 126         pci_disable_device(dev);
 127         iounmap(info->mem[0].internal_addr);
 128 }
 129
 130 static struct pci_device_id netx_pci_ids[] = {
 131         {
 132                 .vendor =       PCI_VENDOR_ID_HILSCHER,
 133                 .device =       PCI_DEVICE_ID_HILSCHER_NETX,
 134                 .subvendor =    0,
 135                 .subdevice =    0,
 136         },
 137         {
 138                 .vendor =       PCI_VENDOR_ID_HILSCHER,
 139                 .device =       PCI_DEVICE_ID_HILSCHER_NETPLC,
 140                 .subvendor =    PCI_VENDOR_ID_HILSCHER,
 141                 .subdevice =    PCI_SUBDEVICE_ID_NETPLC_RAM,
 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_FLASH,
 148         },
 149         {
 150                 .vendor =       PCI_VENDOR_ID_PLX,
 151                 .device =       PCI_DEVICE_ID_PLX_9030,
 152                 .subvendor =    PCI_VENDOR_ID_PLX,
 153                 .subdevice =    PCI_SUBDEVICE_ID_NXSB_PCA,
 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_NXPCA,
 160         },
 161         { 0, }
 162 };
 163
 164 static struct pci_driver netx_pci_driver = {
 165         .name = "netx",
 166         .id_table = netx_pci_ids,
 167         .probe = netx_pci_probe,
 168         .remove = netx_pci_remove,
 169 };
 170
 171 module_pci_driver(netx_pci_driver);
 172 MODULE_DEVICE_TABLE(pci, netx_pci_ids);
 173 MODULE_LICENSE("GPL v2");
 174 MODULE_AUTHOR("Hans J. Koch, Manuel Traut");