// 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 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");