linux-imx

/*

 * uio_aec.c -- simple driver for Adrienne Electronics Corp time code PCI device

 *

 * Copyright (C) 2008 Brandon Philips <brandon@ifup.org>

 *

 *   This program is free software; you can redistribute it and/or modify it

 *   under the terms of the GNU General Public License version 2 as published

 *   by the Free Software Foundation.

 *

 *   This program is distributed in the hope that it will be useful,

 *   but WITHOUT ANY WARRANTY; without even the implied warranty of

 *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

 *   GNU General Public License for more details.

 *

 *   You should have received a copy of the GNU General Public License along

 *   with this program; if not, write to the Free Software Foundation, Inc., 59

 *   Temple Place, Suite 330, Boston, MA 02111-1307, USA.

 */

​

#include <linux/kernel.h>

#include <linux/module.h>

#include <linux/pci.h>

#include <linux/init.h>

#include <linux/interrupt.h>

#include <linux/cdev.h>

#include <linux/fs.h>

#include <linux/io.h>

#include <linux/uaccess.h>

#include <linux/uio_driver.h>

#include <linux/slab.h>

​

#define PCI_VENDOR_ID_AEC 0xaecb

#define PCI_DEVICE_ID_AEC_VITCLTC 0x6250

​

#define INT_ENABLE_ADDR     0xFC

#define INT_ENABLE      0x10

#define INT_DISABLE     0x0

​

#define INT_MASK_ADDR       0x2E

#define INT_MASK_ALL        0x3F

​

#define INTA_DRVR_ADDR      0xFE

#define INTA_ENABLED_FLAG   0x08

#define INTA_FLAG       0x01

​

#define MAILBOX         0x0F

​

static struct pci_device_id ids[] = {

    { PCI_DEVICE(PCI_VENDOR_ID_AEC, PCI_DEVICE_ID_AEC_VITCLTC), },

    { 0, }

};

MODULE_DEVICE_TABLE(pci, ids);

​

static irqreturn_t aectc_irq(int irq, struct uio_info *dev_info)

{

    void __iomem *int_flag = dev_info->priv + INTA_DRVR_ADDR;

    unsigned char status = ioread8(int_flag);

​

​

    if ((status & INTA_ENABLED_FLAG) && (status & INTA_FLAG)) {

        /* application writes 0x00 to 0x2F to get next interrupt */

        status = ioread8(dev_info->priv + MAILBOX);

        return IRQ_HANDLED;