uio_cif.c

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/*
 * UIO Hilscher CIF card driver
 *
 * (C) 2007 Hans J. Koch <[email protected]>
 * Original code (C) 2005 Benedikt Spranger <[email protected]>
 *
 * Licensed under GPL version 2 only.
 *
 */

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

#include <asm/io.h>

#define PLX9030_INTCSR      0x4C
#define INTSCR_INT1_ENABLE  0x01
#define INTSCR_INT1_STATUS  0x04
#define INT1_ENABLED_AND_ACTIVE (INTSCR_INT1_ENABLE | INTSCR_INT1_STATUS)

#define PCI_SUBVENDOR_ID_PEP    0x1518
#define CIF_SUBDEVICE_PROFIBUS  0x430
#define CIF_SUBDEVICE_DEVICENET 0x432


static irqreturn_t hilscher_handler(int irq, struct uio_info *dev_info)
{
    void __iomem *plx_intscr = dev_info->mem[0].internal_addr
                    + PLX9030_INTCSR;

    if ((ioread8(plx_intscr) & INT1_ENABLED_AND_ACTIVE)
        != INT1_ENABLED_AND_ACTIVE)
        return IRQ_NONE;

    /* Disable interrupt */
    iowrite8(ioread8(plx_intscr) & ~INTSCR_INT1_ENABLE, plx_intscr);
    return IRQ_HANDLED;
}

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

    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, "hilscher"))
        goto out_disable;

    info->mem[0].addr = pci_resource_start(dev, 0);
    if (!info->mem[0].addr)
        goto out_release;
    info->mem[0].internal_addr = pci_ioremap_bar(dev, 0);
    if (!info->mem[0].internal_addr)
        goto out_release;

    info->mem[0].size = pci_resource_len(dev, 0);
    info->mem[0].memtype = UIO_MEM_PHYS;
    info->mem[1].addr = pci_resource_start(dev, 2);
    info->mem[1].size = pci_resource_len(dev, 2);
    info->mem[1].memtype = UIO_MEM_PHYS;
    switch (id->subdevice) {
        case CIF_SUBDEVICE_PROFIBUS:
            info->name = "CIF_Profibus";
            break;
        case CIF_SUBDEVICE_DEVICENET:
            info->name = "CIF_Devicenet";
            break;
        default:
            info->name = "CIF_???";
    }
    info->version = "0.0.1";
    info->irq = dev->irq;
    info->irq_flags = IRQF_SHARED;
    info->handler = hilscher_handler;

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

    pci_set_drvdata(dev, info);

    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 hilscher_pci_remove(struct pci_dev *dev)
{
    struct uio_info *info = pci_get_drvdata(dev);

    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 hilscher_pci_ids[] __devinitdata = {
    {
        .vendor =   PCI_VENDOR_ID_PLX,
        .device =   PCI_DEVICE_ID_PLX_9030,
        .subvendor =    PCI_SUBVENDOR_ID_PEP,
        .subdevice =    CIF_SUBDEVICE_PROFIBUS,
    },
    {
        .vendor =   PCI_VENDOR_ID_PLX,
        .device =   PCI_DEVICE_ID_PLX_9030,
        .subvendor =    PCI_SUBVENDOR_ID_PEP,
        .subdevice =    CIF_SUBDEVICE_DEVICENET,
    },
    { 0, }
};

static struct pci_driver hilscher_pci_driver = {
    .name = "hilscher",
    .id_table = hilscher_pci_ids,
    .probe = hilscher_pci_probe,
    .remove = hilscher_pci_remove,
};

static int __init hilscher_init_module(void)
{
    return pci_register_driver(&hilscher_pci_driver);
}

static void __exit hilscher_exit_module(void)
{
    pci_unregister_driver(&hilscher_pci_driver);
}

module_init(hilscher_init_module);
module_exit(hilscher_exit_module);

MODULE_DEVICE_TABLE(pci, hilscher_pci_ids);
MODULE_LICENSE("GPL v2");
MODULE_AUTHOR("Hans J. Koch, Benedikt Spranger");