// SPDX-License-Identifier: GPL-2.0
/*
 * UIO Hilscher CIF card driver
 *
 * (C) 2007 Hans J. Koch <hjk@hansjkoch.de>
 * Original code (C) 2005 Benedikt Spranger <b.spranger@linutronix.de>
 */

#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 hilscher_pci_probe(struct pci_dev *dev,
                                        const struct pci_device_id *id)
{
        struct uio_info *info;

        info = devm_kzalloc(&dev->dev, sizeof(struct uio_info), GFP_KERNEL);
        if (!info)
                return -ENOMEM;

        if (pci_enable_device(dev))
                return -ENODEV;

        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);
        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);
        iounmap(info->mem[0].internal_addr);
}

static const struct pci_device_id hilscher_pci_ids[] = {
        {
                .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,
};

module_pci_driver(hilscher_pci_driver);
MODULE_DEVICE_TABLE(pci, hilscher_pci_ids);
MODULE_DESCRIPTION("UIO Hilscher CIF card driver");
MODULE_LICENSE("GPL v2");
MODULE_AUTHOR("Hans J. Koch, Benedikt Spranger");