linux-imx

// 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 = 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);