linux-imx

/*

 *      Low-level parallel-support for PC-style hardware integrated in the 

 *  LASI-Controller (on GSC-Bus) for HP-PARISC Workstations

 *

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

 *  it under the terms of the GNU General Public License as published by

 *      the Free Software Foundation; either version 2 of the License, or

 *      (at your option) any later version.

 *

 *  (C) 1999-2001 by Helge Deller <deller@gmx.de>

 *

 * 

 * based on parport_pc.c by 

 *      Grant Guenther <grant@torque.net>

 *      Phil Blundell <philb@gnu.org>

 *          Tim Waugh <tim@cyberelk.demon.co.uk>

 *      Jose Renau <renau@acm.org>

 *          David Campbell

 *          Andrea Arcangeli

 */

​

#undef DEBUG    /* undef for production */

​

#include <linux/module.h>

#include <linux/init.h>

#include <linux/delay.h>

#include <linux/errno.h>

#include <linux/interrupt.h>

#include <linux/ioport.h>

#include <linux/kernel.h>

#include <linux/slab.h>

#include <linux/pci.h>

#include <linux/sysctl.h>

​

#include <asm/io.h>

#include <asm/dma.h>

#include <linux/uaccess.h>

#include <asm/superio.h>

​

#include <linux/parport.h>

#include <asm/pdc.h>

#include <asm/parisc-device.h>

#include <asm/hardware.h>

#include "parport_gsc.h"

​

​

MODULE_AUTHOR("Helge Deller <deller@gmx.de>");

MODULE_DESCRIPTION("HP-PARISC PC-style parallel port driver");

MODULE_SUPPORTED_DEVICE("integrated PC-style parallel port");

MODULE_LICENSE("GPL");

​

​

/*

 * Clear TIMEOUT BIT in EPP MODE

 *

 * This is also used in SPP detection.

 */

static int clear_epp_timeout(struct parport *pb)

{

    unsigned char r;

​

    if (!(parport_gsc_read_status(pb) & 0x01))

        return 1;

​

    /* To clear timeout some chips require double read */

    parport_gsc_read_status(pb);

    r = parport_gsc_read_status(pb);

    parport_writeb (r | 0x01, STATUS (pb)); /* Some reset by writing 1 */

    parport_writeb (r & 0xfe, STATUS (pb)); /* Others by writing 0 */

    r = parport_gsc_read_status(pb);

​

    return !(r & 0x01);

}

​

/*

 * Access functions.

 *

 * Most of these aren't static because they may be used by the

 * parport_xxx_yyy macros.  extern __inline__ versions of several

 * of these are in parport_gsc.h.

 */

​

void parport_gsc_init_state(struct pardevice *dev, struct parport_state *s)

{

    s->u.pc.ctr = 0xc | (dev->irq_func ? 0x10 : 0x0);

}

​

void parport_gsc_save_state(struct parport *p, struct parport_state *s)

{

    s->u.pc.ctr = parport_readb (CONTROL (p));

}

​