uio_netx.c

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/*
 * UIO driver for Hilscher NetX based fieldbus cards (cifX, comX).
 * See http://www.hilscher.com for details.
 *
 * (C) 2007 Hans J. Koch <[email protected]>
 * (C) 2008 Manuel Traut <[email protected]>
 *
 * Licensed under GPL version 2 only.
 *
 */

#include <linux/device.h>
#include <linux/io.h>
#include <linux/module.h>
#include <linux/pci.h>
#include <linux/slab.h>
#include <linux/uio_driver.h>

#define PCI_VENDOR_ID_HILSCHER      0x15CF
#define PCI_DEVICE_ID_HILSCHER_NETX 0x0000
#define PCI_DEVICE_ID_HILSCHER_NETPLC   0x0010
#define PCI_SUBDEVICE_ID_NETPLC_RAM 0x0000
#define PCI_SUBDEVICE_ID_NETPLC_FLASH   0x0001
#define PCI_SUBDEVICE_ID_NXSB_PCA   0x3235
#define PCI_SUBDEVICE_ID_NXPCA      0x3335

#define DPM_HOST_INT_EN0    0xfff0
#define DPM_HOST_INT_STAT0  0xffe0

#define DPM_HOST_INT_MASK   0xe600ffff
#define DPM_HOST_INT_GLOBAL_EN  0x80000000

static irqreturn_t netx_handler(int irq, struct uio_info *dev_info)
{
    void __iomem *int_enable_reg = dev_info->mem[0].internal_addr
                    + DPM_HOST_INT_EN0;
    void __iomem *int_status_reg = dev_info->mem[0].internal_addr
                    + DPM_HOST_INT_STAT0;

    /* Is one of our interrupts enabled and active ? */
    if (!(ioread32(int_enable_reg) & ioread32(int_status_reg)
        & DPM_HOST_INT_MASK))
        return IRQ_NONE;

    /* Disable interrupt */
    iowrite32(ioread32(int_enable_reg) & ~DPM_HOST_INT_GLOBAL_EN,
        int_enable_reg);
    return IRQ_HANDLED;
}

static int __devinit netx_pci_probe(struct pci_dev *dev,
                    const struct pci_device_id *id)
{
    struct uio_info *info;
    int bar;

    info = kzalloc(sizeof(struct uio_info), GFP_KERNEL);
    if (!info)
        return -ENOMEM;

    if (pci_enable_device(dev))
        goto out_free;

    if (pci_request_regions(dev, "netx"))
        goto out_disable;

    switch (id->device) {
    case PCI_DEVICE_ID_HILSCHER_NETX:
        bar = 0;
        info->name = "netx";
        break;
    case PCI_DEVICE_ID_HILSCHER_NETPLC:
        bar = 0;
        info->name = "netplc";
        break;
    default:
        bar = 2;
        info->name = "netx_plx";
    }

    /* BAR0 or 2 points to the card's dual port memory */
    info->mem[0].addr = pci_resource_start(dev, bar);
    if (!info->mem[0].addr)
        goto out_release;
    info->mem[0].internal_addr = ioremap(pci_resource_start(dev, bar),
                        pci_resource_len(dev, bar));

    if (!info->mem[0].internal_addr)
            goto out_release;

    info->mem[0].size = pci_resource_len(dev, bar);
    info->mem[0].memtype = UIO_MEM_PHYS;
    info->irq = dev->irq;
    info->irq_flags = IRQF_SHARED;
    info->handler = netx_handler;
    info->version = "0.0.1";

    /* Make sure all interrupts are disabled */
    iowrite32(0, info->mem[0].internal_addr + DPM_HOST_INT_EN0);

    if (uio_register_device(&dev->dev, info))
        goto out_unmap;

    pci_set_drvdata(dev, info);
    dev_info(&dev->dev, "Found %s card, registered UIO device.\n",
                info->name);

    return 0;

out_unmap:
    iounmap(info->mem[0].internal_addr);
out_release:
    pci_release_regions(dev);
out_disable:
    pci_disable_device(dev);
out_free:
    kfree(info);
    return -ENODEV;
}

static void netx_pci_remove(struct pci_dev *dev)
{
    struct uio_info *info = pci_get_drvdata(dev);

    /* Disable all interrupts */
    iowrite32(0, info->mem[0].internal_addr + DPM_HOST_INT_EN0);
    uio_unregister_device(info);
    pci_release_regions(dev);
    pci_disable_device(dev);
    pci_set_drvdata(dev, NULL);
    iounmap(info->mem[0].internal_addr);

    kfree(info);
}

static struct pci_device_id netx_pci_ids[] = {
    {
        .vendor =   PCI_VENDOR_ID_HILSCHER,
        .device =   PCI_DEVICE_ID_HILSCHER_NETX,
        .subvendor =    0,
        .subdevice =    0,
    },
    {
        .vendor =       PCI_VENDOR_ID_HILSCHER,
        .device =       PCI_DEVICE_ID_HILSCHER_NETPLC,
        .subvendor =    PCI_VENDOR_ID_HILSCHER,
        .subdevice =    PCI_SUBDEVICE_ID_NETPLC_RAM,
    },
    {
        .vendor =       PCI_VENDOR_ID_HILSCHER,
        .device =       PCI_DEVICE_ID_HILSCHER_NETPLC,
        .subvendor =    PCI_VENDOR_ID_HILSCHER,
        .subdevice =    PCI_SUBDEVICE_ID_NETPLC_FLASH,
    },
    {
        .vendor =   PCI_VENDOR_ID_PLX,
        .device =   PCI_DEVICE_ID_PLX_9030,
        .subvendor =    PCI_VENDOR_ID_PLX,
        .subdevice =    PCI_SUBDEVICE_ID_NXSB_PCA,
    },
    {
        .vendor =   PCI_VENDOR_ID_PLX,
        .device =   PCI_DEVICE_ID_PLX_9030,
        .subvendor =    PCI_VENDOR_ID_PLX,
        .subdevice =    PCI_SUBDEVICE_ID_NXPCA,
    },
    { 0, }
};

static struct pci_driver netx_pci_driver = {
    .name = "netx",
    .id_table = netx_pci_ids,
    .probe = netx_pci_probe,
    .remove = netx_pci_remove,
};

static int __init netx_init_module(void)
{
    return pci_register_driver(&netx_pci_driver);
}

static void __exit netx_exit_module(void)
{
    pci_unregister_driver(&netx_pci_driver);
}

module_init(netx_init_module);
module_exit(netx_exit_module);

MODULE_DEVICE_TABLE(pci, netx_pci_ids);
MODULE_LICENSE("GPL v2");
MODULE_AUTHOR("Hans J. Koch, Manuel Traut");